--- /dev/null
+name: Clippy Test
+
+on:
+ push:
+ # Ignore bors branches, since they are covered by `clippy_bors.yml`
+ branches-ignore:
+ - auto
+ - try
+ # Don't run Clippy tests, when only text files were modified
+ paths-ignore:
+ - 'COPYRIGHT'
+ - 'LICENSE-*'
+ - '**.md'
+ - '**.txt'
+ pull_request:
+ # Don't run Clippy tests, when only text files were modified
+ paths-ignore:
+ - 'COPYRIGHT'
+ - 'LICENSE-*'
+ - '**.md'
+ - '**.txt'
+
+env:
+ RUST_BACKTRACE: 1
+ CARGO_TARGET_DIR: '${{ github.workspace }}/target'
+ NO_FMT_TEST: 1
+ CARGO_INCREMENTAL: 0
++ CARGO_UNSTABLE_SPARSE_REGISTRY: true
+
+jobs:
+ base:
+ # NOTE: If you modify this job, make sure you copy the changes to clippy_bors.yml
+ runs-on: ubuntu-latest
+
+ steps:
+ # Setup
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ - name: Install toolchain
+ run: rustup show active-toolchain
+
+ # Run
+ - name: Set LD_LIBRARY_PATH (Linux)
+ run: |
+ SYSROOT=$(rustc --print sysroot)
+ echo "LD_LIBRARY_PATH=${SYSROOT}/lib${LD_LIBRARY_PATH+:${LD_LIBRARY_PATH}}" >> $GITHUB_ENV
+
+ - name: Build
+ run: cargo build --features deny-warnings,internal
+
+ - name: Test
+ run: cargo test --features deny-warnings,internal
+
+ - name: Test clippy_lints
+ run: cargo test --features deny-warnings,internal
+ working-directory: clippy_lints
+
+ - name: Test clippy_utils
+ run: cargo test --features deny-warnings,internal
+ working-directory: clippy_utils
+
+ - name: Test rustc_tools_util
+ run: cargo test --features deny-warnings
+ working-directory: rustc_tools_util
+
+ - name: Test clippy_dev
+ run: cargo test --features deny-warnings
+ working-directory: clippy_dev
+
+ - name: Test clippy-driver
+ run: bash .github/driver.sh
+ env:
+ OS: ${{ runner.os }}
--- /dev/null
+name: Clippy Test (bors)
+
+on:
+ push:
+ branches:
+ - auto
+ - try
+
+env:
+ RUST_BACKTRACE: 1
+ CARGO_TARGET_DIR: '${{ github.workspace }}/target'
+ NO_FMT_TEST: 1
+ CARGO_INCREMENTAL: 0
++ CARGO_UNSTABLE_SPARSE_REGISTRY: true
+
+defaults:
+ run:
+ shell: bash
+
+jobs:
+ changelog:
+ runs-on: ubuntu-latest
+
+ steps:
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+ with:
+ ref: ${{ github.ref }}
+
+ # Run
+ - name: Check Changelog
+ run: |
+ MESSAGE=$(git log --format=%B -n 1)
+ PR=$(echo "$MESSAGE" | grep -o "#[0-9]*" | head -1 | sed -e 's/^#//')
+ body=$(curl -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" -s "https://api.github.com/repos/rust-lang/rust-clippy/pulls/$PR" | \
+ python -c "import sys, json; print(json.load(sys.stdin)['body'])")
+ output=$(grep "^changelog:\s*\S" <<< "$body" | sed "s/changelog:\s*//g") || {
+ echo "ERROR: PR body must contain 'changelog: ...'"
+ exit 1
+ }
+ if [[ "$output" = "none" ]]; then
+ echo "WARNING: changelog is 'none'"
+ else
+ echo "changelog: $output"
+ fi
+ env:
+ PYTHONIOENCODING: 'utf-8'
+ base:
+ needs: changelog
+ strategy:
+ matrix:
+ os: [ubuntu-latest, windows-latest, macos-latest]
+ host: [x86_64-unknown-linux-gnu, i686-unknown-linux-gnu, x86_64-apple-darwin, x86_64-pc-windows-msvc]
+ exclude:
+ - os: ubuntu-latest
+ host: x86_64-apple-darwin
+ - os: ubuntu-latest
+ host: x86_64-pc-windows-msvc
+ - os: macos-latest
+ host: x86_64-unknown-linux-gnu
+ - os: macos-latest
+ host: i686-unknown-linux-gnu
+ - os: macos-latest
+ host: x86_64-pc-windows-msvc
+ - os: windows-latest
+ host: x86_64-unknown-linux-gnu
+ - os: windows-latest
+ host: i686-unknown-linux-gnu
+ - os: windows-latest
+ host: x86_64-apple-darwin
+
+ runs-on: ${{ matrix.os }}
+
+ # NOTE: If you modify this job, make sure you copy the changes to clippy.yml
+ steps:
+ # Setup
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Install dependencies (Linux-i686)
+ run: |
+ sudo dpkg --add-architecture i386
+ sudo apt-get update
+ sudo apt-get install gcc-multilib libssl-dev:i386 libgit2-dev:i386
+ if: matrix.host == 'i686-unknown-linux-gnu'
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ - name: Install toolchain
+ run: rustup show active-toolchain
+
+ # Run
+ - name: Set LD_LIBRARY_PATH (Linux)
+ if: runner.os == 'Linux'
+ run: |
+ SYSROOT=$(rustc --print sysroot)
+ echo "LD_LIBRARY_PATH=${SYSROOT}/lib${LD_LIBRARY_PATH+:${LD_LIBRARY_PATH}}" >> $GITHUB_ENV
+ - name: Link rustc dylib (MacOS)
+ if: runner.os == 'macOS'
+ run: |
+ SYSROOT=$(rustc --print sysroot)
+ sudo mkdir -p /usr/local/lib
+ sudo find "${SYSROOT}/lib" -maxdepth 1 -name '*dylib' -exec ln -s {} /usr/local/lib \;
+ - name: Set PATH (Windows)
+ if: runner.os == 'Windows'
+ run: |
+ SYSROOT=$(rustc --print sysroot)
+ echo "$SYSROOT/bin" >> $GITHUB_PATH
+
+ - name: Build
+ run: cargo build --features deny-warnings,internal
+
+ - name: Test
+ if: runner.os == 'Linux'
+ run: cargo test --features deny-warnings,internal
+
+ - name: Test
+ if: runner.os != 'Linux'
+ run: cargo test --features deny-warnings,internal -- --skip dogfood
+
+ - name: Test clippy_lints
+ run: cargo test --features deny-warnings,internal
+ working-directory: clippy_lints
+
+ - name: Test clippy_utils
+ run: cargo test --features deny-warnings,internal
+ working-directory: clippy_utils
+
+ - name: Test rustc_tools_util
+ run: cargo test --features deny-warnings
+ working-directory: rustc_tools_util
+
+ - name: Test clippy_dev
+ run: cargo test --features deny-warnings
+ working-directory: clippy_dev
+
+ - name: Test clippy-driver
+ run: bash .github/driver.sh
+ env:
+ OS: ${{ runner.os }}
+
+ metadata_collection:
+ needs: changelog
+ runs-on: ubuntu-latest
+
+ steps:
+ # Setup
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ - name: Install toolchain
+ run: rustup show active-toolchain
+
+ - name: Test metadata collection
+ run: cargo collect-metadata
+
+ integration_build:
+ needs: changelog
+ runs-on: ubuntu-latest
+
+ steps:
+ # Setup
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ - name: Install toolchain
+ run: rustup show active-toolchain
+
+ # Run
+ - name: Build Integration Test
+ run: cargo test --test integration --features integration --no-run
+
+ # Upload
+ - name: Extract Binaries
+ run: |
+ DIR=$CARGO_TARGET_DIR/debug
+ rm $DIR/deps/integration-*.d
+ mv $DIR/deps/integration-* $DIR/integration
+ find $DIR ! -executable -o -type d ! -path $DIR | xargs rm -rf
+ rm -rf $CARGO_TARGET_DIR/release
+
+ - name: Upload Binaries
+ uses: actions/upload-artifact@v1
+ with:
+ name: target
+ path: target
+
+ integration:
+ needs: integration_build
+ strategy:
+ fail-fast: false
+ max-parallel: 6
+ matrix:
+ integration:
+ - 'rust-lang/cargo'
+ # FIXME: re-enable once fmt_macros is renamed in RLS
+ # - 'rust-lang/rls'
+ - 'rust-lang/chalk'
+ - 'rust-lang/rustfmt'
+ - 'Marwes/combine'
+ - 'Geal/nom'
+ - 'rust-lang/stdarch'
+ - 'serde-rs/serde'
+ # FIXME: chrono currently cannot be compiled with `--all-targets`
+ # - 'chronotope/chrono'
+ - 'hyperium/hyper'
+ - 'rust-random/rand'
+ - 'rust-lang/futures-rs'
+ - 'rust-itertools/itertools'
+ - 'rust-lang-nursery/failure'
+ - 'rust-lang/log'
+
+ runs-on: ubuntu-latest
+
+ steps:
+ # Setup
+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master
+ with:
+ github_token: "${{ secrets.github_token }}"
+
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ - name: Install toolchain
+ run: rustup show active-toolchain
+
+ # Download
+ - name: Download target dir
+ uses: actions/download-artifact@v1
+ with:
+ name: target
+ path: target
+
+ - name: Make Binaries Executable
+ run: chmod +x $CARGO_TARGET_DIR/debug/*
+
+ # Run
+ - name: Test ${{ matrix.integration }}
+ run: |
+ RUSTUP_TOOLCHAIN="$(rustup show active-toolchain | grep -o -E "nightly-[0-9]{4}-[0-9]{2}-[0-9]{2}")" \
+ $CARGO_TARGET_DIR/debug/integration
+ env:
+ INTEGRATION: ${{ matrix.integration }}
+
+ # These jobs doesn't actually test anything, but they're only used to tell
+ # bors the build completed, as there is no practical way to detect when a
+ # workflow is successful listening to webhooks only.
+ #
+ # ALL THE PREVIOUS JOBS NEED TO BE ADDED TO THE `needs` SECTION OF THIS JOB!
+
+ end-success:
+ name: bors test finished
+ if: github.event.pusher.name == 'bors' && success()
+ runs-on: ubuntu-latest
+ needs: [changelog, base, metadata_collection, integration_build, integration]
+
+ steps:
+ - name: Mark the job as successful
+ run: exit 0
+
+ end-failure:
+ name: bors test finished
+ if: github.event.pusher.name == 'bors' && (failure() || cancelled())
+ runs-on: ubuntu-latest
+ needs: [changelog, base, metadata_collection, integration_build, integration]
+
+ steps:
+ - name: Mark the job as a failure
+ run: exit 1
--- /dev/null
+name: Clippy Dev Test
+
+on:
+ push:
+ branches:
+ - auto
+ - try
+ pull_request:
+ # Only run on paths, that get checked by the clippy_dev tool
+ paths:
+ - 'CHANGELOG.md'
+ - 'README.md'
+ - '**.stderr'
+ - '**.rs'
+
+env:
+ RUST_BACKTRACE: 1
++ CARGO_INCREMENTAL: 0
++ CARGO_UNSTABLE_SPARSE_REGISTRY: true
+
+jobs:
+ clippy_dev:
+ runs-on: ubuntu-latest
+
+ steps:
+ # Setup
+ - name: Checkout
+ uses: actions/checkout@v3.0.2
+
+ # Run
+ - name: Build
+ run: cargo build --features deny-warnings
+ working-directory: clippy_dev
+
+ - name: Test update_lints
+ run: cargo dev update_lints --check
+
+ - name: Test fmt
+ run: cargo dev fmt --check
+
+ - name: Test cargo dev new lint
+ run: |
+ cargo dev new_lint --name new_early_pass --pass early
+ cargo dev new_lint --name new_late_pass --pass late
+ cargo check
+ git reset --hard HEAD
+
+ # These jobs doesn't actually test anything, but they're only used to tell
+ # bors the build completed, as there is no practical way to detect when a
+ # workflow is successful listening to webhooks only.
+ #
+ # ALL THE PREVIOUS JOBS NEED TO BE ADDED TO THE `needs` SECTION OF THIS JOB!
+
+ end-success:
+ name: bors dev test finished
+ if: github.event.pusher.name == 'bors' && success()
+ runs-on: ubuntu-latest
+ needs: [clippy_dev]
+
+ steps:
+ - name: Mark the job as successful
+ run: exit 0
+
+ end-failure:
+ name: bors dev test finished
+ if: github.event.pusher.name == 'bors' && (failure() || cancelled())
+ runs-on: ubuntu-latest
+ needs: [clippy_dev]
+
+ steps:
+ - name: Mark the job as a failure
+ run: exit 1
--- /dev/null
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Changelog Update](book/src/development/infrastructure/changelog_update.md) if you want to update this
+document.
+
+## Unreleased / In Rust Nightly
+
+[3c7e7dbc...master](https://github.com/rust-lang/rust-clippy/compare/3c7e7dbc...master)
+
+## Rust 1.64
+
+Current stable, released 2022-09-22
+
+[d7b5cbf0...3c7e7dbc](https://github.com/rust-lang/rust-clippy/compare/d7b5cbf0...3c7e7dbc)
+
+### New Lints
+
+* [`arithmetic_side_effects`]
+ [#9130](https://github.com/rust-lang/rust-clippy/pull/9130)
+* [`invalid_utf8_in_unchecked`]
+ [#9105](https://github.com/rust-lang/rust-clippy/pull/9105)
+* [`assertions_on_result_states`]
+ [#9225](https://github.com/rust-lang/rust-clippy/pull/9225)
+* [`manual_find`]
+ [#8649](https://github.com/rust-lang/rust-clippy/pull/8649)
+* [`manual_retain`]
+ [#8972](https://github.com/rust-lang/rust-clippy/pull/8972)
+* [`default_instead_of_iter_empty`]
+ [#8989](https://github.com/rust-lang/rust-clippy/pull/8989)
+* [`manual_rem_euclid`]
+ [#9031](https://github.com/rust-lang/rust-clippy/pull/9031)
+* [`obfuscated_if_else`]
+ [#9148](https://github.com/rust-lang/rust-clippy/pull/9148)
+* [`std_instead_of_core`]
+ [#9103](https://github.com/rust-lang/rust-clippy/pull/9103)
+* [`std_instead_of_alloc`]
+ [#9103](https://github.com/rust-lang/rust-clippy/pull/9103)
+* [`alloc_instead_of_core`]
+ [#9103](https://github.com/rust-lang/rust-clippy/pull/9103)
+* [`explicit_auto_deref`]
+ [#8355](https://github.com/rust-lang/rust-clippy/pull/8355)
+
+
+### Moves and Deprecations
+
+* Moved [`format_push_string`] to `restriction` (now allow-by-default)
+ [#9161](https://github.com/rust-lang/rust-clippy/pull/9161)
+
+### Enhancements
+
+* [`significant_drop_in_scrutinee`]: Now gives more context in the lint message
+ [#8981](https://github.com/rust-lang/rust-clippy/pull/8981)
+* [`single_match`], [`single_match_else`]: Now catches more `Option` cases
+ [#8985](https://github.com/rust-lang/rust-clippy/pull/8985)
+* [`unused_async`]: Now works for async methods
+ [#9025](https://github.com/rust-lang/rust-clippy/pull/9025)
+* [`manual_filter_map`], [`manual_find_map`]: Now lint more expressions
+ [#8958](https://github.com/rust-lang/rust-clippy/pull/8958)
+* [`question_mark`]: Now works for simple `if let` expressions
+ [#8356](https://github.com/rust-lang/rust-clippy/pull/8356)
+* [`undocumented_unsafe_blocks`]: Now finds comments before the start of closures
+ [#9117](https://github.com/rust-lang/rust-clippy/pull/9117)
+* [`trait_duplication_in_bounds`]: Now catches duplicate bounds in where clauses
+ [#8703](https://github.com/rust-lang/rust-clippy/pull/8703)
+* [`shadow_reuse`], [`shadow_same`], [`shadow_unrelated`]: Now lint in const blocks
+ [#9124](https://github.com/rust-lang/rust-clippy/pull/9124)
+* [`slow_vector_initialization`]: Now detects cases with `vec.capacity()`
+ [#8953](https://github.com/rust-lang/rust-clippy/pull/8953)
+* [`unused_self`]: Now respects the `avoid-breaking-exported-api` config option
+ [#9199](https://github.com/rust-lang/rust-clippy/pull/9199)
+* [`box_collection`]: Now supports all std collections
+ [#9170](https://github.com/rust-lang/rust-clippy/pull/9170)
+
+### False Positive Fixes
+
+* [`significant_drop_in_scrutinee`]: Now ignores calls to `IntoIterator::into_iter`
+ [#9140](https://github.com/rust-lang/rust-clippy/pull/9140)
+* [`while_let_loop`]: Now ignores cases when the significant drop order would change
+ [#8981](https://github.com/rust-lang/rust-clippy/pull/8981)
+* [`branches_sharing_code`]: Now ignores cases where moved variables have a significant
+ drop or variable modifications can affect the conditions
+ [#9138](https://github.com/rust-lang/rust-clippy/pull/9138)
+* [`let_underscore_lock`]: Now ignores bindings that aren't locked
+ [#8990](https://github.com/rust-lang/rust-clippy/pull/8990)
+* [`trivially_copy_pass_by_ref`]: Now tracks lifetimes and ignores cases where unsafe
+ pointers are used
+ [#8639](https://github.com/rust-lang/rust-clippy/pull/8639)
+* [`let_unit_value`]: No longer ignores `#[allow]` attributes on the value
+ [#9082](https://github.com/rust-lang/rust-clippy/pull/9082)
+* [`declare_interior_mutable_const`]: Now ignores the `thread_local!` macro
+ [#9015](https://github.com/rust-lang/rust-clippy/pull/9015)
+* [`if_same_then_else`]: Now ignores branches with `todo!` and `unimplemented!`
+ [#9006](https://github.com/rust-lang/rust-clippy/pull/9006)
+* [`enum_variant_names`]: Now ignores names with `_` prefixes
+ [#9032](https://github.com/rust-lang/rust-clippy/pull/9032)
+* [`let_unit_value`]: Now ignores cases, where the unit type is manually specified
+ [#9056](https://github.com/rust-lang/rust-clippy/pull/9056)
+* [`match_same_arms`]: Now ignores branches with `todo!`
+ [#9207](https://github.com/rust-lang/rust-clippy/pull/9207)
+* [`assign_op_pattern`]: Ignores cases that break borrowing rules
+ [#9214](https://github.com/rust-lang/rust-clippy/pull/9214)
+* [`extra_unused_lifetimes`]: No longer triggers in derive macros
+ [#9037](https://github.com/rust-lang/rust-clippy/pull/9037)
+* [`mismatching_type_param_order`]: Now ignores complicated generic parameters
+ [#9146](https://github.com/rust-lang/rust-clippy/pull/9146)
+* [`equatable_if_let`]: No longer lints in macros
+ [#9074](https://github.com/rust-lang/rust-clippy/pull/9074)
+* [`new_without_default`]: Now ignores generics and lifetime parameters on `fn new`
+ [#9115](https://github.com/rust-lang/rust-clippy/pull/9115)
+* [`needless_borrow`]: Now ignores cases that result in the execution of different traits
+ [#9096](https://github.com/rust-lang/rust-clippy/pull/9096)
+* [`declare_interior_mutable_const`]: No longer triggers in thread-local initializers
+ [#9246](https://github.com/rust-lang/rust-clippy/pull/9246)
+
+### Suggestion Fixes/Improvements
+
+* [`type_repetition_in_bounds`]: The suggestion now works with maybe bounds
+ [#9132](https://github.com/rust-lang/rust-clippy/pull/9132)
+* [`transmute_ptr_to_ref`]: Now suggests `pointer::cast` when possible
+ [#8939](https://github.com/rust-lang/rust-clippy/pull/8939)
+* [`useless_format`]: Now suggests the correct variable name
+ [#9237](https://github.com/rust-lang/rust-clippy/pull/9237)
+* [`or_fun_call`]: The lint emission will now only span over the `unwrap_or` call
+ [#9144](https://github.com/rust-lang/rust-clippy/pull/9144)
+* [`neg_multiply`]: Now suggests adding parentheses around suggestion if needed
+ [#9026](https://github.com/rust-lang/rust-clippy/pull/9026)
+* [`unnecessary_lazy_evaluations`]: Now suggest for `bool::then_some` for lazy evaluation
+ [#9099](https://github.com/rust-lang/rust-clippy/pull/9099)
+* [`manual_flatten`]: Improved message for long code snippets
+ [#9156](https://github.com/rust-lang/rust-clippy/pull/9156)
+* [`explicit_counter_loop`]: The suggestion is now machine applicable
+ [#9149](https://github.com/rust-lang/rust-clippy/pull/9149)
+* [`needless_borrow`]: Now keeps parentheses around fields, when needed
+ [#9210](https://github.com/rust-lang/rust-clippy/pull/9210)
+* [`while_let_on_iterator`]: The suggestion now works in `FnOnce` closures
+ [#9134](https://github.com/rust-lang/rust-clippy/pull/9134)
+
+### ICE Fixes
+
+* Fix ICEs related to `#![feature(generic_const_exprs)]` usage
+ [#9241](https://github.com/rust-lang/rust-clippy/pull/9241)
+* Fix ICEs related to reference lints
+ [#9093](https://github.com/rust-lang/rust-clippy/pull/9093)
+* [`question_mark`]: Fix ICE on zero field tuple structs
+ [#9244](https://github.com/rust-lang/rust-clippy/pull/9244)
+
+### Documentation Improvements
+
+* [`needless_option_take`]: Now includes a "What it does" and "Why is this bad?" section.
+ [#9022](https://github.com/rust-lang/rust-clippy/pull/9022)
+
+### Others
+
+* Using `--cap-lints=allow` and only `--force-warn`ing some will now work with Clippy's driver
+ [#9036](https://github.com/rust-lang/rust-clippy/pull/9036)
+* Clippy now tries to read the `rust-version` from `Cargo.toml` to identify the
+ minimum supported rust version
+ [#8774](https://github.com/rust-lang/rust-clippy/pull/8774)
+
+## Rust 1.63
+
+Released 2022-08-11
+
+[7c21f91b...d7b5cbf0](https://github.com/rust-lang/rust-clippy/compare/7c21f91b...d7b5cbf0)
+
+### New Lints
+
+* [`borrow_deref_ref`]
+ [#7930](https://github.com/rust-lang/rust-clippy/pull/7930)
+* [`doc_link_with_quotes`]
+ [#8385](https://github.com/rust-lang/rust-clippy/pull/8385)
+* [`no_effect_replace`]
+ [#8754](https://github.com/rust-lang/rust-clippy/pull/8754)
+* [`rc_clone_in_vec_init`]
+ [#8769](https://github.com/rust-lang/rust-clippy/pull/8769)
+* [`derive_partial_eq_without_eq`]
+ [#8796](https://github.com/rust-lang/rust-clippy/pull/8796)
+* [`mismatching_type_param_order`]
+ [#8831](https://github.com/rust-lang/rust-clippy/pull/8831)
+* [`duplicate_mod`] [#8832](https://github.com/rust-lang/rust-clippy/pull/8832)
+* [`unused_rounding`]
+ [#8866](https://github.com/rust-lang/rust-clippy/pull/8866)
+* [`get_first`] [#8882](https://github.com/rust-lang/rust-clippy/pull/8882)
+* [`swap_ptr_to_ref`]
+ [#8916](https://github.com/rust-lang/rust-clippy/pull/8916)
+* [`almost_complete_letter_range`]
+ [#8918](https://github.com/rust-lang/rust-clippy/pull/8918)
+* [`needless_parens_on_range_literals`]
+ [#8933](https://github.com/rust-lang/rust-clippy/pull/8933)
+* [`as_underscore`] [#8934](https://github.com/rust-lang/rust-clippy/pull/8934)
+
+### Moves and Deprecations
+
+* Rename `eval_order_dependence` to [`mixed_read_write_in_expression`], move to
+ `nursery` [#8621](https://github.com/rust-lang/rust-clippy/pull/8621)
+
+### Enhancements
+
+* [`undocumented_unsafe_blocks`]: Now also lints on unsafe trait implementations
+ [#8761](https://github.com/rust-lang/rust-clippy/pull/8761)
+* [`empty_line_after_outer_attr`]: Now also lints on argumentless macros
+ [#8790](https://github.com/rust-lang/rust-clippy/pull/8790)
+* [`expect_used`]: Now can be disabled in tests with the `allow-expect-in-tests`
+ option [#8802](https://github.com/rust-lang/rust-clippy/pull/8802)
+* [`unwrap_used`]: Now can be disabled in tests with the `allow-unwrap-in-tests`
+ option [#8802](https://github.com/rust-lang/rust-clippy/pull/8802)
+* [`disallowed_methods`]: Now also lints indirect usages
+ [#8852](https://github.com/rust-lang/rust-clippy/pull/8852)
+* [`get_last_with_len`]: Now also lints `VecDeque` and any deref to slice
+ [#8862](https://github.com/rust-lang/rust-clippy/pull/8862)
+* [`manual_range_contains`]: Now also lints on chains of `&&` and `||`
+ [#8884](https://github.com/rust-lang/rust-clippy/pull/8884)
+* [`rc_clone_in_vec_init`]: Now also lints on `Weak`
+ [#8885](https://github.com/rust-lang/rust-clippy/pull/8885)
+* [`dbg_macro`]: Introduce `allow-dbg-in-tests` config option
+ [#8897](https://github.com/rust-lang/rust-clippy/pull/8897)
+* [`use_self`]: Now also lints on `TupleStruct` and `Struct` patterns
+ [#8899](https://github.com/rust-lang/rust-clippy/pull/8899)
+* [`manual_find_map`] and [`manual_filter_map`]: Now also lints on more complex
+ method chains inside `map`
+ [#8930](https://github.com/rust-lang/rust-clippy/pull/8930)
+* [`needless_return`]: Now also lints on macro expressions in return statements
+ [#8932](https://github.com/rust-lang/rust-clippy/pull/8932)
+* [`doc_markdown`]: Users can now indicate, that the `doc-valid-idents` config
+ should extend the default and not replace it
+ [#8944](https://github.com/rust-lang/rust-clippy/pull/8944)
+* [`disallowed_names`]: Users can now indicate, that the `disallowed-names`
+ config should extend the default and not replace it
+ [#8944](https://github.com/rust-lang/rust-clippy/pull/8944)
+* [`never_loop`]: Now checks for `continue` in struct expression
+ [#9002](https://github.com/rust-lang/rust-clippy/pull/9002)
+
+### False Positive Fixes
+
+* [`useless_transmute`]: No longer lints on types with erased regions
+ [#8564](https://github.com/rust-lang/rust-clippy/pull/8564)
+* [`vec_init_then_push`]: No longer lints when further extended
+ [#8699](https://github.com/rust-lang/rust-clippy/pull/8699)
+* [`cmp_owned`]: No longer lints on `From::from` for `Copy` types
+ [#8807](https://github.com/rust-lang/rust-clippy/pull/8807)
+* [`redundant_allocation`]: No longer lints on fat pointers that would become
+ thin pointers [#8813](https://github.com/rust-lang/rust-clippy/pull/8813)
+* [`derive_partial_eq_without_eq`]:
+ * Handle differing predicates applied by `#[derive(PartialEq)]` and
+ `#[derive(Eq)]`
+ [#8869](https://github.com/rust-lang/rust-clippy/pull/8869)
+ * No longer lints on non-public types and better handles generics
+ [#8950](https://github.com/rust-lang/rust-clippy/pull/8950)
+* [`empty_line_after_outer_attr`]: No longer lints empty lines in inner
+ string values [#8892](https://github.com/rust-lang/rust-clippy/pull/8892)
+* [`branches_sharing_code`]: No longer lints when using different binding names
+ [#8901](https://github.com/rust-lang/rust-clippy/pull/8901)
+* [`significant_drop_in_scrutinee`]: No longer lints on Try `?` and `await`
+ desugared expressions [#8902](https://github.com/rust-lang/rust-clippy/pull/8902)
+* [`checked_conversions`]: No longer lints in `const` contexts
+ [#8907](https://github.com/rust-lang/rust-clippy/pull/8907)
+* [`iter_overeager_cloned`]: No longer lints on `.cloned().flatten()` when
+ `T::Item` doesn't implement `IntoIterator`
+ [#8960](https://github.com/rust-lang/rust-clippy/pull/8960)
+
+### Suggestion Fixes/Improvements
+
+* [`vec_init_then_push`]: Suggest to remove `mut` binding when possible
+ [#8699](https://github.com/rust-lang/rust-clippy/pull/8699)
+* [`manual_range_contains`]: Fix suggestion for integers with different signs
+ [#8763](https://github.com/rust-lang/rust-clippy/pull/8763)
+* [`identity_op`]: Add parenthesis to suggestions where required
+ [#8786](https://github.com/rust-lang/rust-clippy/pull/8786)
+* [`cast_lossless`]: No longer gives wrong suggestion on `usize`/`isize`->`f64`
+ [#8778](https://github.com/rust-lang/rust-clippy/pull/8778)
+* [`rc_clone_in_vec_init`]: Add suggestion
+ [#8814](https://github.com/rust-lang/rust-clippy/pull/8814)
+* The "unknown field" error messages for config files now wraps the field names
+ [#8823](https://github.com/rust-lang/rust-clippy/pull/8823)
+* [`cast_abs_to_unsigned`]: Do not remove cast if it's required
+ [#8876](https://github.com/rust-lang/rust-clippy/pull/8876)
+* [`significant_drop_in_scrutinee`]: Improve lint message for types that are not
+ references and not trivially clone-able
+ [#8902](https://github.com/rust-lang/rust-clippy/pull/8902)
+* [`for_loops_over_fallibles`]: Now suggests the correct variant of `iter()`,
+ `iter_mut()` or `into_iter()`
+ [#8941](https://github.com/rust-lang/rust-clippy/pull/8941)
+
+### ICE Fixes
+
+* Fix ICE in [`let_unit_value`] when calling a `static`/`const` callable type
+ [#8835](https://github.com/rust-lang/rust-clippy/pull/8835)
+* Fix ICEs on callable `static`/`const`s
+ [#8896](https://github.com/rust-lang/rust-clippy/pull/8896)
+* [`needless_late_init`]
+ [#8912](https://github.com/rust-lang/rust-clippy/pull/8912)
+* Fix ICE in shadow lints
+ [#8913](https://github.com/rust-lang/rust-clippy/pull/8913)
+
+### Documentation Improvements
+
+* Clippy has a [Book](https://doc.rust-lang.org/nightly/clippy/) now!
+ [#7359](https://github.com/rust-lang/rust-clippy/pull/7359)
+* Add a *copy lint name*-button to Clippy's lint list
+ [#8839](https://github.com/rust-lang/rust-clippy/pull/8839)
+* Display past names of renamed lints on Clippy's lint list
+ [#8843](https://github.com/rust-lang/rust-clippy/pull/8843)
+* Add the ability to show the lint output in the lint list
+ [#8947](https://github.com/rust-lang/rust-clippy/pull/8947)
+
+## Rust 1.62
+
+Released 2022-06-30
+
+[d0cf3481...7c21f91b](https://github.com/rust-lang/rust-clippy/compare/d0cf3481...7c21f91b)
+
+### New Lints
+
+* [`large_include_file`]
+ [#8727](https://github.com/rust-lang/rust-clippy/pull/8727)
+* [`cast_abs_to_unsigned`]
+ [#8635](https://github.com/rust-lang/rust-clippy/pull/8635)
+* [`err_expect`]
+ [#8606](https://github.com/rust-lang/rust-clippy/pull/8606)
+* [`unnecessary_owned_empty_strings`]
+ [#8660](https://github.com/rust-lang/rust-clippy/pull/8660)
+* [`empty_structs_with_brackets`]
+ [#8594](https://github.com/rust-lang/rust-clippy/pull/8594)
+* [`crate_in_macro_def`]
+ [#8576](https://github.com/rust-lang/rust-clippy/pull/8576)
+* [`needless_option_take`]
+ [#8665](https://github.com/rust-lang/rust-clippy/pull/8665)
+* [`bytes_count_to_len`]
+ [#8711](https://github.com/rust-lang/rust-clippy/pull/8711)
+* [`is_digit_ascii_radix`]
+ [#8624](https://github.com/rust-lang/rust-clippy/pull/8624)
+* [`await_holding_invalid_type`]
+ [#8707](https://github.com/rust-lang/rust-clippy/pull/8707)
+* [`trim_split_whitespace`]
+ [#8575](https://github.com/rust-lang/rust-clippy/pull/8575)
+* [`pub_use`]
+ [#8670](https://github.com/rust-lang/rust-clippy/pull/8670)
+* [`format_push_string`]
+ [#8626](https://github.com/rust-lang/rust-clippy/pull/8626)
+* [`empty_drop`]
+ [#8571](https://github.com/rust-lang/rust-clippy/pull/8571)
+* [`drop_non_drop`]
+ [#8630](https://github.com/rust-lang/rust-clippy/pull/8630)
+* [`forget_non_drop`]
+ [#8630](https://github.com/rust-lang/rust-clippy/pull/8630)
+
+### Moves and Deprecations
+
+* Move [`only_used_in_recursion`] to `nursery` (now allow-by-default)
+ [#8783](https://github.com/rust-lang/rust-clippy/pull/8783)
+* Move [`stable_sort_primitive`] to `pedantic` (now allow-by-default)
+ [#8716](https://github.com/rust-lang/rust-clippy/pull/8716)
+
+### Enhancements
+
+* Remove overlap between [`manual_split_once`] and [`needless_splitn`]
+ [#8631](https://github.com/rust-lang/rust-clippy/pull/8631)
+* [`map_identity`]: Now checks for needless `map_err`
+ [#8487](https://github.com/rust-lang/rust-clippy/pull/8487)
+* [`extra_unused_lifetimes`]: Now checks for impl lifetimes
+ [#8737](https://github.com/rust-lang/rust-clippy/pull/8737)
+* [`cast_possible_truncation`]: Now catches more cases with larger shift or divide operations
+ [#8687](https://github.com/rust-lang/rust-clippy/pull/8687)
+* [`identity_op`]: Now checks for modulo expressions
+ [#8519](https://github.com/rust-lang/rust-clippy/pull/8519)
+* [`panic`]: No longer lint in constant context
+ [#8592](https://github.com/rust-lang/rust-clippy/pull/8592)
+* [`manual_split_once`]: Now lints manual iteration of `splitn`
+ [#8717](https://github.com/rust-lang/rust-clippy/pull/8717)
+* [`self_named_module_files`], [`mod_module_files`]: Now handle relative module paths
+ [#8611](https://github.com/rust-lang/rust-clippy/pull/8611)
+* [`unsound_collection_transmute`]: Now has better size and alignment checks
+ [#8648](https://github.com/rust-lang/rust-clippy/pull/8648)
+* [`unnested_or_patterns`]: Ignore cases, where the suggestion would be longer
+ [#8619](https://github.com/rust-lang/rust-clippy/pull/8619)
+
+### False Positive Fixes
+
+* [`rest_pat_in_fully_bound_structs`]: Now ignores structs marked with `#[non_exhaustive]`
+ [#8690](https://github.com/rust-lang/rust-clippy/pull/8690)
+* [`needless_late_init`]: No longer lints `if let` statements, `let mut` bindings or instances that
+ changes the drop order significantly
+ [#8617](https://github.com/rust-lang/rust-clippy/pull/8617)
+* [`unnecessary_cast`]: No longer lints to casts to aliased or non-primitive types
+ [#8596](https://github.com/rust-lang/rust-clippy/pull/8596)
+* [`init_numbered_fields`]: No longer lints type aliases
+ [#8780](https://github.com/rust-lang/rust-clippy/pull/8780)
+* [`needless_option_as_deref`]: No longer lints for `as_deref_mut` on `Option` values that can't be moved
+ [#8646](https://github.com/rust-lang/rust-clippy/pull/8646)
+* [`mistyped_literal_suffixes`]: Now ignores float literals without an exponent
+ [#8742](https://github.com/rust-lang/rust-clippy/pull/8742)
+* [`undocumented_unsafe_blocks`]: Now ignores unsafe blocks from proc-macros and works better for sub-expressions
+ [#8450](https://github.com/rust-lang/rust-clippy/pull/8450)
+* [`same_functions_in_if_condition`]: Now allows different constants, even if they have the same value
+ [#8673](https://github.com/rust-lang/rust-clippy/pull/8673)
+* [`needless_match`]: Now checks for more complex types and ignores type coercion
+ [#8549](https://github.com/rust-lang/rust-clippy/pull/8549)
+* [`assertions_on_constants`]: Now ignores constants from `cfg!` macros
+ [#8614](https://github.com/rust-lang/rust-clippy/pull/8614)
+* [`indexing_slicing`]: Fix false positives with constant indices in
+ [#8588](https://github.com/rust-lang/rust-clippy/pull/8588)
+* [`iter_with_drain`]: Now ignores iterator references
+ [#8668](https://github.com/rust-lang/rust-clippy/pull/8668)
+* [`useless_attribute`]: Now allows [`redundant_pub_crate`] on `use` items
+ [#8743](https://github.com/rust-lang/rust-clippy/pull/8743)
+* [`cast_ptr_alignment`]: Now ignores expressions, when used for unaligned reads and writes
+ [#8632](https://github.com/rust-lang/rust-clippy/pull/8632)
+* [`wrong_self_convention`]: Now allows `&mut self` and no self as arguments for `is_*` methods
+ [#8738](https://github.com/rust-lang/rust-clippy/pull/8738)
+* [`mut_from_ref`]: Only lint in unsafe code
+ [#8647](https://github.com/rust-lang/rust-clippy/pull/8647)
+* [`redundant_pub_crate`]: Now allows macro exports
+ [#8736](https://github.com/rust-lang/rust-clippy/pull/8736)
+* [`needless_match`]: Ignores cases where the else block expression is different
+ [#8700](https://github.com/rust-lang/rust-clippy/pull/8700)
+* [`transmute_int_to_char`]: Now allows transmutations in `const` code
+ [#8610](https://github.com/rust-lang/rust-clippy/pull/8610)
+* [`manual_non_exhaustive`]: Ignores cases, where the enum value is used
+ [#8645](https://github.com/rust-lang/rust-clippy/pull/8645)
+* [`redundant_closure`]: Now ignores coerced closure
+ [#8431](https://github.com/rust-lang/rust-clippy/pull/8431)
+* [`identity_op`]: Is now ignored in cases where extra brackets would be needed
+ [#8730](https://github.com/rust-lang/rust-clippy/pull/8730)
+* [`let_unit_value`]: Now ignores cases which are used for type inference
+ [#8563](https://github.com/rust-lang/rust-clippy/pull/8563)
+
+### Suggestion Fixes/Improvements
+
+* [`manual_split_once`]: Fixed incorrect suggestions for single result accesses
+ [#8631](https://github.com/rust-lang/rust-clippy/pull/8631)
+* [`bytes_nth`]: Fix typos in the diagnostic message
+ [#8403](https://github.com/rust-lang/rust-clippy/pull/8403)
+* [`mistyped_literal_suffixes`]: Now suggests the correct integer types
+ [#8742](https://github.com/rust-lang/rust-clippy/pull/8742)
+* [`unnecessary_to_owned`]: Fixed suggestion based on the configured msrv
+ [#8692](https://github.com/rust-lang/rust-clippy/pull/8692)
+* [`single_element_loop`]: Improve lint for Edition 2021 arrays
+ [#8616](https://github.com/rust-lang/rust-clippy/pull/8616)
+* [`manual_bits`]: Now includes a cast for proper type conversion, when needed
+ [#8677](https://github.com/rust-lang/rust-clippy/pull/8677)
+* [`option_map_unit_fn`], [`result_map_unit_fn`]: Fix some incorrect suggestions
+ [#8584](https://github.com/rust-lang/rust-clippy/pull/8584)
+* [`collapsible_else_if`]: Add whitespace in suggestion
+ [#8729](https://github.com/rust-lang/rust-clippy/pull/8729)
+* [`transmute_bytes_to_str`]: Now suggest `from_utf8_unchecked` in `const` context
+ [#8612](https://github.com/rust-lang/rust-clippy/pull/8612)
+* [`map_clone`]: Improve message and suggestion based on the msrv
+ [#8688](https://github.com/rust-lang/rust-clippy/pull/8688)
+* [`needless_late_init`]: Now shows the `let` statement where it was first initialized
+ [#8779](https://github.com/rust-lang/rust-clippy/pull/8779)
+
+### ICE Fixes
+
+* [`only_used_in_recursion`]
+ [#8691](https://github.com/rust-lang/rust-clippy/pull/8691)
+* [`cast_slice_different_sizes`]
+ [#8720](https://github.com/rust-lang/rust-clippy/pull/8720)
+* [`iter_overeager_cloned`]
+ [#8602](https://github.com/rust-lang/rust-clippy/pull/8602)
+* [`undocumented_unsafe_blocks`]
+ [#8686](https://github.com/rust-lang/rust-clippy/pull/8686)
+
+## Rust 1.61
+
+Released 2022-05-19
+
+[57b3c4b...d0cf3481](https://github.com/rust-lang/rust-clippy/compare/57b3c4b...d0cf3481)
+
+### New Lints
+
+* [`only_used_in_recursion`]
+ [#8422](https://github.com/rust-lang/rust-clippy/pull/8422)
+* [`cast_enum_truncation`]
+ [#8381](https://github.com/rust-lang/rust-clippy/pull/8381)
+* [`missing_spin_loop`]
+ [#8174](https://github.com/rust-lang/rust-clippy/pull/8174)
+* [`deref_by_slicing`]
+ [#8218](https://github.com/rust-lang/rust-clippy/pull/8218)
+* [`needless_match`]
+ [#8471](https://github.com/rust-lang/rust-clippy/pull/8471)
+* [`allow_attributes_without_reason`] (Requires `#![feature(lint_reasons)]`)
+ [#8504](https://github.com/rust-lang/rust-clippy/pull/8504)
+* [`print_in_format_impl`]
+ [#8253](https://github.com/rust-lang/rust-clippy/pull/8253)
+* [`unnecessary_find_map`]
+ [#8489](https://github.com/rust-lang/rust-clippy/pull/8489)
+* [`or_then_unwrap`]
+ [#8561](https://github.com/rust-lang/rust-clippy/pull/8561)
+* [`unnecessary_join`]
+ [#8579](https://github.com/rust-lang/rust-clippy/pull/8579)
+* [`iter_with_drain`]
+ [#8483](https://github.com/rust-lang/rust-clippy/pull/8483)
+* [`cast_enum_constructor`]
+ [#8562](https://github.com/rust-lang/rust-clippy/pull/8562)
+* [`cast_slice_different_sizes`]
+ [#8445](https://github.com/rust-lang/rust-clippy/pull/8445)
+
+### Moves and Deprecations
+
+* Moved [`transmute_undefined_repr`] to `nursery` (now allow-by-default)
+ [#8432](https://github.com/rust-lang/rust-clippy/pull/8432)
+* Moved [`try_err`] to `restriction`
+ [#8544](https://github.com/rust-lang/rust-clippy/pull/8544)
+* Move [`iter_with_drain`] to `nursery`
+ [#8541](https://github.com/rust-lang/rust-clippy/pull/8541)
+* Renamed `to_string_in_display` to [`recursive_format_impl`]
+ [#8188](https://github.com/rust-lang/rust-clippy/pull/8188)
+
+### Enhancements
+
+* [`dbg_macro`]: The lint level can now be set with crate attributes and works inside macros
+ [#8411](https://github.com/rust-lang/rust-clippy/pull/8411)
+* [`ptr_as_ptr`]: Now works inside macros
+ [#8442](https://github.com/rust-lang/rust-clippy/pull/8442)
+* [`use_self`]: Now works for variants in match expressions
+ [#8456](https://github.com/rust-lang/rust-clippy/pull/8456)
+* [`await_holding_lock`]: Now lints for `parking_lot::{Mutex, RwLock}`
+ [#8419](https://github.com/rust-lang/rust-clippy/pull/8419)
+* [`recursive_format_impl`]: Now checks for format calls on `self`
+ [#8188](https://github.com/rust-lang/rust-clippy/pull/8188)
+
+### False Positive Fixes
+
+* [`new_without_default`]: No longer lints for `new()` methods with `#[doc(hidden)]`
+ [#8472](https://github.com/rust-lang/rust-clippy/pull/8472)
+* [`transmute_undefined_repr`]: No longer lints for single field structs with `#[repr(C)]`,
+ generic parameters, wide pointers, unions, tuples and allow several forms of type erasure
+ [#8425](https://github.com/rust-lang/rust-clippy/pull/8425)
+ [#8553](https://github.com/rust-lang/rust-clippy/pull/8553)
+ [#8440](https://github.com/rust-lang/rust-clippy/pull/8440)
+ [#8547](https://github.com/rust-lang/rust-clippy/pull/8547)
+* [`match_single_binding`], [`match_same_arms`], [`match_as_ref`], [`match_bool`]: No longer
+ lint `match` expressions with `cfg`ed arms
+ [#8443](https://github.com/rust-lang/rust-clippy/pull/8443)
+* [`single_component_path_imports`]: No longer lint on macros
+ [#8537](https://github.com/rust-lang/rust-clippy/pull/8537)
+* [`ptr_arg`]: Allow `&mut` arguments for `Cow<_>`
+ [#8552](https://github.com/rust-lang/rust-clippy/pull/8552)
+* [`needless_borrow`]: No longer lints for method calls
+ [#8441](https://github.com/rust-lang/rust-clippy/pull/8441)
+* [`match_same_arms`]: Now ensures that interposing arm patterns don't overlap
+ [#8232](https://github.com/rust-lang/rust-clippy/pull/8232)
+* [`default_trait_access`]: Now allows `Default::default` in update expressions
+ [#8433](https://github.com/rust-lang/rust-clippy/pull/8433)
+
+### Suggestion Fixes/Improvements
+
+* [`redundant_slicing`]: Fixed suggestion for a method calls
+ [#8218](https://github.com/rust-lang/rust-clippy/pull/8218)
+* [`map_flatten`]: Long suggestions will now be split up into two help messages
+ [#8520](https://github.com/rust-lang/rust-clippy/pull/8520)
+* [`unnecessary_lazy_evaluations`]: Now shows suggestions for longer code snippets
+ [#8543](https://github.com/rust-lang/rust-clippy/pull/8543)
+* [`unnecessary_sort_by`]: Now suggests `Reverse` including the path
+ [#8462](https://github.com/rust-lang/rust-clippy/pull/8462)
+* [`search_is_some`]: More suggestions are now `MachineApplicable`
+ [#8536](https://github.com/rust-lang/rust-clippy/pull/8536)
+
+### Documentation Improvements
+
+* [`new_without_default`]: Document `pub` requirement for the struct and fields
+ [#8429](https://github.com/rust-lang/rust-clippy/pull/8429)
+
+## Rust 1.60
+
+Released 2022-04-07
+
+[0eff589...57b3c4b](https://github.com/rust-lang/rust-clippy/compare/0eff589...57b3c4b)
+
+### New Lints
+
+* [`single_char_lifetime_names`]
+ [#8236](https://github.com/rust-lang/rust-clippy/pull/8236)
+* [`iter_overeager_cloned`]
+ [#8203](https://github.com/rust-lang/rust-clippy/pull/8203)
+* [`transmute_undefined_repr`]
+ [#8398](https://github.com/rust-lang/rust-clippy/pull/8398)
+* [`default_union_representation`]
+ [#8289](https://github.com/rust-lang/rust-clippy/pull/8289)
+* [`manual_bits`]
+ [#8213](https://github.com/rust-lang/rust-clippy/pull/8213)
+* [`borrow_as_ptr`]
+ [#8210](https://github.com/rust-lang/rust-clippy/pull/8210)
+
+### Moves and Deprecations
+
+* Moved [`disallowed_methods`] and [`disallowed_types`] to `style` (now warn-by-default)
+ [#8261](https://github.com/rust-lang/rust-clippy/pull/8261)
+* Rename `ref_in_deref` to [`needless_borrow`]
+ [#8217](https://github.com/rust-lang/rust-clippy/pull/8217)
+* Moved [`mutex_atomic`] to `nursery` (now allow-by-default)
+ [#8260](https://github.com/rust-lang/rust-clippy/pull/8260)
+
+### Enhancements
+
+* [`ptr_arg`]: Now takes the argument usage into account and lints for mutable references
+ [#8271](https://github.com/rust-lang/rust-clippy/pull/8271)
+* [`unused_io_amount`]: Now supports async read and write traits
+ [#8179](https://github.com/rust-lang/rust-clippy/pull/8179)
+* [`while_let_on_iterator`]: Improved detection to catch more cases
+ [#8221](https://github.com/rust-lang/rust-clippy/pull/8221)
+* [`trait_duplication_in_bounds`]: Now covers trait functions with `Self` bounds
+ [#8252](https://github.com/rust-lang/rust-clippy/pull/8252)
+* [`unwrap_used`]: Now works for `.get(i).unwrap()` and `.get_mut(i).unwrap()`
+ [#8372](https://github.com/rust-lang/rust-clippy/pull/8372)
+* [`map_clone`]: The suggestion takes `msrv` into account
+ [#8280](https://github.com/rust-lang/rust-clippy/pull/8280)
+* [`manual_bits`] and [`borrow_as_ptr`]: Now track the `clippy::msrv` attribute
+ [#8280](https://github.com/rust-lang/rust-clippy/pull/8280)
+* [`disallowed_methods`]: Now works for methods on primitive types
+ [#8112](https://github.com/rust-lang/rust-clippy/pull/8112)
+* [`not_unsafe_ptr_arg_deref`]: Now works for type aliases
+ [#8273](https://github.com/rust-lang/rust-clippy/pull/8273)
+* [`needless_question_mark`]: Now works for async functions
+ [#8311](https://github.com/rust-lang/rust-clippy/pull/8311)
+* [`iter_not_returning_iterator`]: Now handles type projections
+ [#8228](https://github.com/rust-lang/rust-clippy/pull/8228)
+* [`wrong_self_convention`]: Now detects wrong `self` references in more cases
+ [#8208](https://github.com/rust-lang/rust-clippy/pull/8208)
+* [`single_match`]: Now works for `match` statements with tuples
+ [#8322](https://github.com/rust-lang/rust-clippy/pull/8322)
+
+### False Positive Fixes
+
+* [`erasing_op`]: No longer triggers if the output type changes
+ [#8204](https://github.com/rust-lang/rust-clippy/pull/8204)
+* [`if_same_then_else`]: No longer triggers for `if let` statements
+ [#8297](https://github.com/rust-lang/rust-clippy/pull/8297)
+* [`manual_memcpy`]: No longer lints on `VecDeque`
+ [#8226](https://github.com/rust-lang/rust-clippy/pull/8226)
+* [`trait_duplication_in_bounds`]: Now takes path segments into account
+ [#8315](https://github.com/rust-lang/rust-clippy/pull/8315)
+* [`deref_addrof`]: No longer lints when the dereference or borrow occurs in different a context
+ [#8268](https://github.com/rust-lang/rust-clippy/pull/8268)
+* [`type_repetition_in_bounds`]: Now checks for full equality to prevent false positives
+ [#8224](https://github.com/rust-lang/rust-clippy/pull/8224)
+* [`ptr_arg`]: No longer lint for mutable references in traits
+ [#8369](https://github.com/rust-lang/rust-clippy/pull/8369)
+* [`implicit_clone`]: No longer lints for double references
+ [#8231](https://github.com/rust-lang/rust-clippy/pull/8231)
+* [`needless_lifetimes`]: No longer lints lifetimes for explicit `self` types
+ [#8278](https://github.com/rust-lang/rust-clippy/pull/8278)
+* [`op_ref`]: No longer lints in `BinOp` impl if that can cause recursion
+ [#8298](https://github.com/rust-lang/rust-clippy/pull/8298)
+* [`enum_variant_names`]: No longer triggers for empty variant names
+ [#8329](https://github.com/rust-lang/rust-clippy/pull/8329)
+* [`redundant_closure`]: No longer lints for `Arc<T>` or `Rc<T>`
+ [#8193](https://github.com/rust-lang/rust-clippy/pull/8193)
+* [`iter_not_returning_iterator`]: No longer lints on trait implementations but therefore on trait definitions
+ [#8228](https://github.com/rust-lang/rust-clippy/pull/8228)
+* [`single_match`]: No longer lints on exhaustive enum patterns without a wildcard
+ [#8322](https://github.com/rust-lang/rust-clippy/pull/8322)
+* [`manual_swap`]: No longer lints on cases that involve automatic dereferences
+ [#8220](https://github.com/rust-lang/rust-clippy/pull/8220)
+* [`useless_format`]: Now works for implicit named arguments
+ [#8295](https://github.com/rust-lang/rust-clippy/pull/8295)
+
+### Suggestion Fixes/Improvements
+
+* [`needless_borrow`]: Prevent mutable borrows being moved and suggest removing the borrow on method calls
+ [#8217](https://github.com/rust-lang/rust-clippy/pull/8217)
+* [`chars_next_cmp`]: Correctly escapes the suggestion
+ [#8376](https://github.com/rust-lang/rust-clippy/pull/8376)
+* [`explicit_write`]: Add suggestions for `write!`s with format arguments
+ [#8365](https://github.com/rust-lang/rust-clippy/pull/8365)
+* [`manual_memcpy`]: Suggests `copy_from_slice` when applicable
+ [#8226](https://github.com/rust-lang/rust-clippy/pull/8226)
+* [`or_fun_call`]: Improved suggestion display for long arguments
+ [#8292](https://github.com/rust-lang/rust-clippy/pull/8292)
+* [`unnecessary_cast`]: Now correctly includes the sign
+ [#8350](https://github.com/rust-lang/rust-clippy/pull/8350)
+* [`cmp_owned`]: No longer flips the comparison order
+ [#8299](https://github.com/rust-lang/rust-clippy/pull/8299)
+* [`explicit_counter_loop`]: Now correctly suggests `iter()` on references
+ [#8382](https://github.com/rust-lang/rust-clippy/pull/8382)
+
+### ICE Fixes
+
+* [`manual_split_once`]
+ [#8250](https://github.com/rust-lang/rust-clippy/pull/8250)
+
+### Documentation Improvements
+
+* [`map_flatten`]: Add documentation for the `Option` type
+ [#8354](https://github.com/rust-lang/rust-clippy/pull/8354)
+* Document that Clippy's driver might use a different code generation than rustc
+ [#8037](https://github.com/rust-lang/rust-clippy/pull/8037)
+* Clippy's lint list will now automatically focus the search box
+ [#8343](https://github.com/rust-lang/rust-clippy/pull/8343)
+
+### Others
+
+* Clippy now warns if we find multiple Clippy config files exist
+ [#8326](https://github.com/rust-lang/rust-clippy/pull/8326)
+
+## Rust 1.59
+
+Released 2022-02-24
+
+[e181011...0eff589](https://github.com/rust-lang/rust-clippy/compare/e181011...0eff589)
+
+### New Lints
+
+* [`index_refutable_slice`]
+ [#7643](https://github.com/rust-lang/rust-clippy/pull/7643)
+* [`needless_splitn`]
+ [#7896](https://github.com/rust-lang/rust-clippy/pull/7896)
+* [`unnecessary_to_owned`]
+ [#7978](https://github.com/rust-lang/rust-clippy/pull/7978)
+* [`needless_late_init`]
+ [#7995](https://github.com/rust-lang/rust-clippy/pull/7995)
+* [`octal_escapes`] [#8007](https://github.com/rust-lang/rust-clippy/pull/8007)
+* [`return_self_not_must_use`]
+ [#8071](https://github.com/rust-lang/rust-clippy/pull/8071)
+* [`init_numbered_fields`]
+ [#8170](https://github.com/rust-lang/rust-clippy/pull/8170)
+
+### Moves and Deprecations
+
+* Move `if_then_panic` to `pedantic` and rename to [`manual_assert`] (now
+ allow-by-default) [#7810](https://github.com/rust-lang/rust-clippy/pull/7810)
+* Rename `disallow_type` to [`disallowed_types`] and `disallowed_method` to
+ [`disallowed_methods`]
+ [#7984](https://github.com/rust-lang/rust-clippy/pull/7984)
+* Move [`map_flatten`] to `complexity` (now warn-by-default)
+ [#8054](https://github.com/rust-lang/rust-clippy/pull/8054)
+
+### Enhancements
+
+* [`match_overlapping_arm`]: Fix false negative where after included ranges,
+ overlapping ranges weren't linted anymore
+ [#7909](https://github.com/rust-lang/rust-clippy/pull/7909)
+* [`deprecated_cfg_attr`]: Now takes the specified MSRV into account
+ [#7944](https://github.com/rust-lang/rust-clippy/pull/7944)
+* [`cast_lossless`]: Now also lints for `bool` to integer casts
+ [#7948](https://github.com/rust-lang/rust-clippy/pull/7948)
+* [`let_underscore_lock`]: Also emit lints for the `parking_lot` crate
+ [#7957](https://github.com/rust-lang/rust-clippy/pull/7957)
+* [`needless_borrow`]
+ [#7977](https://github.com/rust-lang/rust-clippy/pull/7977)
+ * Lint when a borrow is auto-dereffed more than once
+ * Lint in the trailing expression of a block for a match arm
+* [`strlen_on_c_strings`]
+ [8001](https://github.com/rust-lang/rust-clippy/pull/8001)
+ * Lint when used without a fully-qualified path
+ * Suggest removing the surrounding unsafe block when possible
+* [`non_ascii_literal`]: Now also lints on `char`s, not just `string`s
+ [#8034](https://github.com/rust-lang/rust-clippy/pull/8034)
+* [`single_char_pattern`]: Now also lints on `split_inclusive`, `split_once`,
+ `rsplit_once`, `replace`, and `replacen`
+ [#8077](https://github.com/rust-lang/rust-clippy/pull/8077)
+* [`unwrap_or_else_default`]: Now also lints on `std` constructors like
+ `Vec::new`, `HashSet::new`, and `HashMap::new`
+ [#8163](https://github.com/rust-lang/rust-clippy/pull/8163)
+* [`shadow_reuse`]: Now also lints on shadowed `if let` bindings, instead of
+ [`shadow_unrelated`]
+ [#8165](https://github.com/rust-lang/rust-clippy/pull/8165)
+
+### False Positive Fixes
+
+* [`or_fun_call`], [`unnecessary_lazy_evaluations`]: Improve heuristics, so that
+ cheap functions (e.g. calling `.len()` on a `Vec`) won't get linted anymore
+ [#7639](https://github.com/rust-lang/rust-clippy/pull/7639)
+* [`manual_split_once`]: No longer suggests code changing the original behavior
+ [#7896](https://github.com/rust-lang/rust-clippy/pull/7896)
+* Don't show [`no_effect`] or [`unnecessary_operation`] warning for unit struct
+ implementing `FnOnce`
+ [#7898](https://github.com/rust-lang/rust-clippy/pull/7898)
+* [`semicolon_if_nothing_returned`]: Fixed a bug, where the lint wrongly
+ triggered on `let-else` statements
+ [#7955](https://github.com/rust-lang/rust-clippy/pull/7955)
+* [`if_then_some_else_none`]: No longer lints if there is an early return
+ [#7980](https://github.com/rust-lang/rust-clippy/pull/7980)
+* [`needless_collect`]: No longer suggests removal of `collect` when removal
+ would create code requiring mutably borrowing a value multiple times
+ [#7982](https://github.com/rust-lang/rust-clippy/pull/7982)
+* [`shadow_same`]: Fix false positive for `async` function's params
+ [#7997](https://github.com/rust-lang/rust-clippy/pull/7997)
+* [`suboptimal_flops`]: No longer triggers in constant functions
+ [#8009](https://github.com/rust-lang/rust-clippy/pull/8009)
+* [`type_complexity`]: No longer lints on associated types in traits
+ [#8030](https://github.com/rust-lang/rust-clippy/pull/8030)
+* [`question_mark`]: No longer lints if returned object is not local
+ [#8080](https://github.com/rust-lang/rust-clippy/pull/8080)
+* [`option_if_let_else`]: No longer lint on complex sub-patterns
+ [#8086](https://github.com/rust-lang/rust-clippy/pull/8086)
+* [`blocks_in_if_conditions`]: No longer lints on empty closures
+ [#8100](https://github.com/rust-lang/rust-clippy/pull/8100)
+* [`enum_variant_names`]: No longer lint when first prefix is only a substring
+ of a camel-case word
+ [#8127](https://github.com/rust-lang/rust-clippy/pull/8127)
+* [`identity_op`]: Only lint on integral operands
+ [#8183](https://github.com/rust-lang/rust-clippy/pull/8183)
+
+### Suggestion Fixes/Improvements
+
+* [`search_is_some`]: Fix suggestion for `any()` not taking item by reference
+ [#7463](https://github.com/rust-lang/rust-clippy/pull/7463)
+* [`almost_swapped`]: Now detects if there is a `no_std` or `no_core` attribute
+ and adapts the suggestion accordingly
+ [#7877](https://github.com/rust-lang/rust-clippy/pull/7877)
+* [`redundant_pattern_matching`]: Fix suggestion for deref expressions
+ [#7949](https://github.com/rust-lang/rust-clippy/pull/7949)
+* [`explicit_counter_loop`]: Now also produces a suggestion for non-`usize`
+ types [#7950](https://github.com/rust-lang/rust-clippy/pull/7950)
+* [`manual_map`]: Fix suggestion when used with unsafe functions and blocks
+ [#7968](https://github.com/rust-lang/rust-clippy/pull/7968)
+* [`option_map_or_none`]: Suggest `map` over `and_then` when possible
+ [#7971](https://github.com/rust-lang/rust-clippy/pull/7971)
+* [`option_if_let_else`]: No longer expands macros in the suggestion
+ [#7974](https://github.com/rust-lang/rust-clippy/pull/7974)
+* [`iter_cloned_collect`]: Suggest `copied` over `cloned` when possible
+ [#8006](https://github.com/rust-lang/rust-clippy/pull/8006)
+* [`doc_markdown`]: No longer uses inline hints to improve readability of
+ suggestion [#8011](https://github.com/rust-lang/rust-clippy/pull/8011)
+* [`needless_question_mark`]: Now better explains the suggestion
+ [#8028](https://github.com/rust-lang/rust-clippy/pull/8028)
+* [`single_char_pattern`]: Escape backslash `\` in suggestion
+ [#8067](https://github.com/rust-lang/rust-clippy/pull/8067)
+* [`needless_bool`]: Suggest `a != b` over `!(a == b)`
+ [#8117](https://github.com/rust-lang/rust-clippy/pull/8117)
+* [`iter_skip_next`]: Suggest to add a `mut` if it is necessary in order to
+ apply this lints suggestion
+ [#8133](https://github.com/rust-lang/rust-clippy/pull/8133)
+* [`neg_multiply`]: Now produces a suggestion
+ [#8144](https://github.com/rust-lang/rust-clippy/pull/8144)
+* [`needless_return`]: Now suggests the unit type `()` over an empty block `{}`
+ in match arms [#8185](https://github.com/rust-lang/rust-clippy/pull/8185)
+* [`suboptimal_flops`]: Now gives a syntactically correct suggestion for
+ `to_radians` and `to_degrees`
+ [#8187](https://github.com/rust-lang/rust-clippy/pull/8187)
+
+### ICE Fixes
+
+* [`undocumented_unsafe_blocks`]
+ [#7945](https://github.com/rust-lang/rust-clippy/pull/7945)
+ [#7988](https://github.com/rust-lang/rust-clippy/pull/7988)
+* [`unnecessary_cast`]
+ [#8167](https://github.com/rust-lang/rust-clippy/pull/8167)
+
+### Documentation Improvements
+
+* [`print_stdout`], [`print_stderr`], [`dbg_macro`]: Document how the lint level
+ can be changed crate-wide
+ [#8040](https://github.com/rust-lang/rust-clippy/pull/8040)
+* Added a note to the `README` that config changes don't apply to already
+ compiled code [#8175](https://github.com/rust-lang/rust-clippy/pull/8175)
+
+### Others
+
+* [Clippy's lint
+ list](https://rust-lang.github.io/rust-clippy/master/index.html) now displays
+ the version a lint was added. :tada:
+ [#7813](https://github.com/rust-lang/rust-clippy/pull/7813)
+* New and improved issue templates
+ [#8032](https://github.com/rust-lang/rust-clippy/pull/8032)
+* _Dev:_ Add `cargo dev lint` command, to run your modified Clippy version on a
+ file [#7917](https://github.com/rust-lang/rust-clippy/pull/7917)
+
+## Rust 1.58
+
+Released 2022-01-13
+
+[00e31fa...e181011](https://github.com/rust-lang/rust-clippy/compare/00e31fa...e181011)
+
+### Rust 1.58.1
+
+* Move [`non_send_fields_in_send_ty`] to `nursery` (now allow-by-default)
+ [#8075](https://github.com/rust-lang/rust-clippy/pull/8075)
+* [`useless_format`]: Handle implicit named arguments
+ [#8295](https://github.com/rust-lang/rust-clippy/pull/8295)
+
+### New lints
+
+* [`transmute_num_to_bytes`]
+ [#7805](https://github.com/rust-lang/rust-clippy/pull/7805)
+* [`match_str_case_mismatch`]
+ [#7806](https://github.com/rust-lang/rust-clippy/pull/7806)
+* [`format_in_format_args`], [`to_string_in_format_args`]
+ [#7743](https://github.com/rust-lang/rust-clippy/pull/7743)
+* [`uninit_vec`]
+ [#7682](https://github.com/rust-lang/rust-clippy/pull/7682)
+* [`fn_to_numeric_cast_any`]
+ [#7705](https://github.com/rust-lang/rust-clippy/pull/7705)
+* [`undocumented_unsafe_blocks`]
+ [#7748](https://github.com/rust-lang/rust-clippy/pull/7748)
+* [`trailing_empty_array`]
+ [#7838](https://github.com/rust-lang/rust-clippy/pull/7838)
+* [`string_slice`]
+ [#7878](https://github.com/rust-lang/rust-clippy/pull/7878)
+
+### Moves or deprecations of lints
+
+* Move [`non_send_fields_in_send_ty`] to `suspicious`
+ [#7874](https://github.com/rust-lang/rust-clippy/pull/7874)
+* Move [`non_ascii_literal`] to `restriction`
+ [#7907](https://github.com/rust-lang/rust-clippy/pull/7907)
+
+### Changes that expand what code existing lints cover
+
+* [`question_mark`] now covers `Result`
+ [#7840](https://github.com/rust-lang/rust-clippy/pull/7840)
+* Make [`useless_format`] recognize bare `format!("")`
+ [#7801](https://github.com/rust-lang/rust-clippy/pull/7801)
+* Lint on underscored variables with no side effects in [`no_effect`]
+ [#7775](https://github.com/rust-lang/rust-clippy/pull/7775)
+* Expand [`match_ref_pats`] to check for multiple reference patterns
+ [#7800](https://github.com/rust-lang/rust-clippy/pull/7800)
+
+### False positive fixes
+
+* Fix false positive of [`implicit_saturating_sub`] with `else` clause
+ [#7832](https://github.com/rust-lang/rust-clippy/pull/7832)
+* Fix [`question_mark`] when there is call in conditional predicate
+ [#7860](https://github.com/rust-lang/rust-clippy/pull/7860)
+* [`mut_mut`] no longer lints when type is defined in external macros
+ [#7795](https://github.com/rust-lang/rust-clippy/pull/7795)
+* Avoid [`eq_op`] in test functions
+ [#7811](https://github.com/rust-lang/rust-clippy/pull/7811)
+* [`cast_possible_truncation`] no longer lints when cast is coming from `signum`
+ method call [#7850](https://github.com/rust-lang/rust-clippy/pull/7850)
+* [`match_str_case_mismatch`] no longer lints on uncased characters
+ [#7865](https://github.com/rust-lang/rust-clippy/pull/7865)
+* [`ptr_arg`] no longer lints references to type aliases
+ [#7890](https://github.com/rust-lang/rust-clippy/pull/7890)
+* [`missing_safety_doc`] now also accepts "implementation safety" headers
+ [#7856](https://github.com/rust-lang/rust-clippy/pull/7856)
+* [`missing_safety_doc`] no longer lints if any parent has `#[doc(hidden)]`
+ attribute [#7849](https://github.com/rust-lang/rust-clippy/pull/7849)
+* [`if_not_else`] now ignores else-if statements
+ [#7895](https://github.com/rust-lang/rust-clippy/pull/7895)
+* Avoid linting [`cast_possible_truncation`] on bit-reducing operations
+ [#7819](https://github.com/rust-lang/rust-clippy/pull/7819)
+* Avoid linting [`field_reassign_with_default`] when `Drop` and `Copy` are
+ involved [#7794](https://github.com/rust-lang/rust-clippy/pull/7794)
+* [`unnecessary_sort_by`] now checks if argument implements `Ord` trait
+ [#7824](https://github.com/rust-lang/rust-clippy/pull/7824)
+* Fix false positive in [`match_overlapping_arm`]
+ [#7847](https://github.com/rust-lang/rust-clippy/pull/7847)
+* Prevent [`needless_lifetimes`] false positive in `async` function definition
+ [#7901](https://github.com/rust-lang/rust-clippy/pull/7901)
+
+### Suggestion fixes/improvements
+
+* Keep an initial `::` when [`doc_markdown`] suggests to use ticks
+ [#7916](https://github.com/rust-lang/rust-clippy/pull/7916)
+* Add a machine applicable suggestion for the [`doc_markdown`] missing backticks
+ lint [#7904](https://github.com/rust-lang/rust-clippy/pull/7904)
+* [`equatable_if_let`] no longer expands macros in the suggestion
+ [#7788](https://github.com/rust-lang/rust-clippy/pull/7788)
+* Make [`shadow_reuse`] suggestion less verbose
+ [#7782](https://github.com/rust-lang/rust-clippy/pull/7782)
+
+### ICE fixes
+
+* Fix ICE in [`enum_variant_names`]
+ [#7873](https://github.com/rust-lang/rust-clippy/pull/7873)
+* Fix ICE in [`undocumented_unsafe_blocks`]
+ [#7891](https://github.com/rust-lang/rust-clippy/pull/7891)
+
+### Documentation improvements
+
+* Fixed naive doc formatting for `#[must_use]` lints ([`must_use_unit`],
+ [`double_must_use`], [`must_use_candidate`], [`let_underscore_must_use`])
+ [#7827](https://github.com/rust-lang/rust-clippy/pull/7827)
+* Fix typo in example for [`match_result_ok`]
+ [#7815](https://github.com/rust-lang/rust-clippy/pull/7815)
+
+### Others
+
+* Allow giving reasons for [`disallowed_types`]
+ [#7791](https://github.com/rust-lang/rust-clippy/pull/7791)
+* Fix [`manual_assert`] and [`match_wild_err_arm`] for `#![no_std]` and Rust
+ 2021. [#7851](https://github.com/rust-lang/rust-clippy/pull/7851)
+* Fix regression in [`semicolon_if_nothing_returned`] on macros containing while
+ loops [#7789](https://github.com/rust-lang/rust-clippy/pull/7789)
+* Added a new configuration `literal-suffix-style` to enforce a certain style
+ writing [`unseparated_literal_suffix`]
+ [#7726](https://github.com/rust-lang/rust-clippy/pull/7726)
+
+## Rust 1.57
+
+Released 2021-12-02
+
+[7bfc26e...00e31fa](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...00e31fa)
+
+### New Lints
+
+* [`negative_feature_names`]
+ [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
+* [`redundant_feature_names`]
+ [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
+* [`mod_module_files`]
+ [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
+* [`self_named_module_files`]
+ [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
+* [`manual_split_once`]
+ [#7565](https://github.com/rust-lang/rust-clippy/pull/7565)
+* [`derivable_impls`]
+ [#7570](https://github.com/rust-lang/rust-clippy/pull/7570)
+* [`needless_option_as_deref`]
+ [#7596](https://github.com/rust-lang/rust-clippy/pull/7596)
+* [`iter_not_returning_iterator`]
+ [#7610](https://github.com/rust-lang/rust-clippy/pull/7610)
+* [`same_name_method`]
+ [#7653](https://github.com/rust-lang/rust-clippy/pull/7653)
+* [`manual_assert`] [#7669](https://github.com/rust-lang/rust-clippy/pull/7669)
+* [`non_send_fields_in_send_ty`]
+ [#7709](https://github.com/rust-lang/rust-clippy/pull/7709)
+* [`equatable_if_let`]
+ [#7762](https://github.com/rust-lang/rust-clippy/pull/7762)
+
+### Moves and Deprecations
+
+* Move [`shadow_unrelated`] to `restriction`
+ [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
+* Move [`option_if_let_else`] to `nursery`
+ [#7568](https://github.com/rust-lang/rust-clippy/pull/7568)
+* Move [`branches_sharing_code`] to `nursery`
+ [#7595](https://github.com/rust-lang/rust-clippy/pull/7595)
+* Rename `if_let_some_result` to [`match_result_ok`] which now also handles
+ `while let` cases [#7608](https://github.com/rust-lang/rust-clippy/pull/7608)
+* Move [`many_single_char_names`] to `pedantic`
+ [#7671](https://github.com/rust-lang/rust-clippy/pull/7671)
+* Move [`float_cmp`] to `pedantic`
+ [#7692](https://github.com/rust-lang/rust-clippy/pull/7692)
+* Rename `box_vec` to [`box_collection`] and lint on more general cases
+ [#7693](https://github.com/rust-lang/rust-clippy/pull/7693)
+* Uplift `invalid_atomic_ordering` to rustc
+ [rust-lang/rust#84039](https://github.com/rust-lang/rust/pull/84039)
+
+### Enhancements
+
+* Rewrite the `shadow*` lints, so that they find a lot more shadows and are not
+ limited to certain patterns
+ [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
+* The `avoid-breaking-exported-api` configuration now also works for
+ [`box_collection`], [`redundant_allocation`], [`rc_buffer`], [`vec_box`],
+ [`option_option`], [`linkedlist`], [`rc_mutex`]
+ [#7560](https://github.com/rust-lang/rust-clippy/pull/7560)
+* [`unnecessary_unwrap`]: Now also checks for `expect`s
+ [#7584](https://github.com/rust-lang/rust-clippy/pull/7584)
+* [`disallowed_methods`]: Allow adding a reason that will be displayed with the
+ lint message
+ [#7621](https://github.com/rust-lang/rust-clippy/pull/7621)
+* [`approx_constant`]: Now checks the MSRV for `LOG10_2` and `LOG2_10`
+ [#7629](https://github.com/rust-lang/rust-clippy/pull/7629)
+* [`approx_constant`]: Add `TAU`
+ [#7642](https://github.com/rust-lang/rust-clippy/pull/7642)
+* [`needless_borrow`]: Now also lints on needless mutable borrows
+ [#7657](https://github.com/rust-lang/rust-clippy/pull/7657)
+* [`missing_safety_doc`]: Now also lints on unsafe traits
+ [#7734](https://github.com/rust-lang/rust-clippy/pull/7734)
+
+### False Positive Fixes
+
+* [`manual_map`]: No longer lints when the option is borrowed in the match and
+ also consumed in the arm
+ [#7531](https://github.com/rust-lang/rust-clippy/pull/7531)
+* [`filter_next`]: No longer lints if `filter` method is not the
+ `Iterator::filter` method
+ [#7562](https://github.com/rust-lang/rust-clippy/pull/7562)
+* [`manual_flatten`]: No longer lints if expression is used after `if let`
+ [#7566](https://github.com/rust-lang/rust-clippy/pull/7566)
+* [`option_if_let_else`]: Multiple fixes
+ [#7573](https://github.com/rust-lang/rust-clippy/pull/7573)
+ * `break` and `continue` statements local to the would-be closure are
+ allowed
+ * Don't lint in const contexts
+ * Don't lint when yield expressions are used
+ * Don't lint when the captures made by the would-be closure conflict with
+ the other branch
+ * Don't lint when a field of a local is used when the type could be
+ potentially moved from
+ * In some cases, don't lint when scrutinee expression conflicts with the
+ captures of the would-be closure
+* [`redundant_allocation`]: No longer lints on `Box<Box<dyn T>>` which replaces
+ wide pointers with thin pointers
+ [#7592](https://github.com/rust-lang/rust-clippy/pull/7592)
+* [`bool_assert_comparison`]: No longer lints on types that do not implement the
+ `Not` trait with `Output = bool`
+ [#7605](https://github.com/rust-lang/rust-clippy/pull/7605)
+* [`mut_range_bound`]: No longer lints on range bound mutations, that are
+ immediately followed by a `break;`
+ [#7607](https://github.com/rust-lang/rust-clippy/pull/7607)
+* [`mutable_key_type`]: Improve accuracy and document remaining false positives
+ and false negatives
+ [#7640](https://github.com/rust-lang/rust-clippy/pull/7640)
+* [`redundant_closure`]: Rewrite the lint to fix various false positives and
+ false negatives [#7661](https://github.com/rust-lang/rust-clippy/pull/7661)
+* [`large_enum_variant`]: No longer wrongly identifies the second largest
+ variant [#7677](https://github.com/rust-lang/rust-clippy/pull/7677)
+* [`needless_return`]: No longer lints on let-else expressions
+ [#7685](https://github.com/rust-lang/rust-clippy/pull/7685)
+* [`suspicious_else_formatting`]: No longer lints in proc-macros
+ [#7707](https://github.com/rust-lang/rust-clippy/pull/7707)
+* [`excessive_precision`]: No longer lints when in some cases the float was
+ already written in the shortest form
+ [#7722](https://github.com/rust-lang/rust-clippy/pull/7722)
+* [`doc_markdown`]: No longer lints on intra-doc links
+ [#7772](https://github.com/rust-lang/rust-clippy/pull/7772)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_operation`]: Recommend using an `assert!` instead of using a
+ function call in an indexing operation
+ [#7453](https://github.com/rust-lang/rust-clippy/pull/7453)
+* [`manual_split_once`]: Produce semantically equivalent suggestion when
+ `rsplitn` is used [#7663](https://github.com/rust-lang/rust-clippy/pull/7663)
+* [`while_let_on_iterator`]: Produce correct suggestion when using `&mut`
+ [#7690](https://github.com/rust-lang/rust-clippy/pull/7690)
+* [`manual_assert`]: No better handles complex conditions
+ [#7741](https://github.com/rust-lang/rust-clippy/pull/7741)
+* Correctly handle signs in exponents in numeric literals lints
+ [#7747](https://github.com/rust-lang/rust-clippy/pull/7747)
+* [`suspicious_map`]: Now also suggests to use `inspect` as an alternative
+ [#7770](https://github.com/rust-lang/rust-clippy/pull/7770)
+* Drop exponent from suggestion if it is 0 in numeric literals lints
+ [#7774](https://github.com/rust-lang/rust-clippy/pull/7774)
+
+### ICE Fixes
+
+* [`implicit_hasher`]
+ [#7761](https://github.com/rust-lang/rust-clippy/pull/7761)
+
+### Others
+
+* Clippy now uses the 2021
+ [Edition!](https://www.youtube.com/watch?v=q0aNduqb2Ro)
+ [#7664](https://github.com/rust-lang/rust-clippy/pull/7664)
+
+## Rust 1.56
+
+Released 2021-10-21
+
+[74d1561...7bfc26e](https://github.com/rust-lang/rust-clippy/compare/74d1561...7bfc26e)
+
+### New Lints
+
+* [`unwrap_or_else_default`]
+ [#7516](https://github.com/rust-lang/rust-clippy/pull/7516)
+
+### Enhancements
+
+* [`needless_continue`]: Now also lints in `loop { continue; }` case
+ [#7477](https://github.com/rust-lang/rust-clippy/pull/7477)
+* [`disallowed_types`]: Now also primitive types can be disallowed
+ [#7488](https://github.com/rust-lang/rust-clippy/pull/7488)
+* [`manual_swap`]: Now also lints on xor swaps
+ [#7506](https://github.com/rust-lang/rust-clippy/pull/7506)
+* [`map_flatten`]: Now also lints on the `Result` type
+ [#7522](https://github.com/rust-lang/rust-clippy/pull/7522)
+* [`no_effect`]: Now also lints on inclusive ranges
+ [#7556](https://github.com/rust-lang/rust-clippy/pull/7556)
+
+### False Positive Fixes
+
+* [`nonstandard_macro_braces`]: No longer lints on similar named nested macros
+ [#7478](https://github.com/rust-lang/rust-clippy/pull/7478)
+* [`too_many_lines`]: No longer lints in closures to avoid duplicated diagnostics
+ [#7534](https://github.com/rust-lang/rust-clippy/pull/7534)
+* [`similar_names`]: No longer complains about `iter` and `item` being too
+ similar [#7546](https://github.com/rust-lang/rust-clippy/pull/7546)
+
+### Suggestion Fixes/Improvements
+
+* [`similar_names`]: No longer suggests to insert or add an underscore as a fix
+ [#7221](https://github.com/rust-lang/rust-clippy/pull/7221)
+* [`new_without_default`]: No longer shows the full qualified type path when
+ suggesting adding a `Default` implementation
+ [#7493](https://github.com/rust-lang/rust-clippy/pull/7493)
+* [`while_let_on_iterator`]: Now suggests re-borrowing mutable references
+ [#7520](https://github.com/rust-lang/rust-clippy/pull/7520)
+* [`extend_with_drain`]: Improve code suggestion for mutable and immutable
+ references [#7533](https://github.com/rust-lang/rust-clippy/pull/7533)
+* [`trivially_copy_pass_by_ref`]: Now properly handles `Self` type
+ [#7535](https://github.com/rust-lang/rust-clippy/pull/7535)
+* [`never_loop`]: Now suggests using `if let` instead of a `for` loop when
+ applicable [#7541](https://github.com/rust-lang/rust-clippy/pull/7541)
+
+### Documentation Improvements
+
+* Clippy now uses a lint to generate its lint documentation. [Lints all the way
+ down](https://en.wikipedia.org/wiki/Turtles_all_the_way_down).
+ [#7502](https://github.com/rust-lang/rust-clippy/pull/7502)
+* Reworked Clippy's website:
+ [#7172](https://github.com/rust-lang/rust-clippy/issues/7172)
+ [#7279](https://github.com/rust-lang/rust-clippy/pull/7279)
+ * Added applicability information about lints
+ * Added a link to jump into the implementation
+ * Improved loading times
+ * Adapted some styling
+* `cargo clippy --help` now also explains the `--fix` and `--no-deps` flag
+ [#7492](https://github.com/rust-lang/rust-clippy/pull/7492)
+* [`unnested_or_patterns`]: Removed `or_patterns` feature gate in the code
+ example [#7507](https://github.com/rust-lang/rust-clippy/pull/7507)
+
+## Rust 1.55
+
+Released 2021-09-09
+
+[3ae8faf...74d1561](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...74d1561)
+
+### Important Changes
+
+* Stabilized `cargo clippy --fix` :tada:
+ [#7405](https://github.com/rust-lang/rust-clippy/pull/7405)
+
+### New Lints
+
+* [`rc_mutex`]
+ [#7316](https://github.com/rust-lang/rust-clippy/pull/7316)
+* [`nonstandard_macro_braces`]
+ [#7299](https://github.com/rust-lang/rust-clippy/pull/7299)
+* [`strlen_on_c_strings`]
+ [#7243](https://github.com/rust-lang/rust-clippy/pull/7243)
+* [`self_named_constructors`]
+ [#7403](https://github.com/rust-lang/rust-clippy/pull/7403)
+* [`disallowed_script_idents`]
+ [#7400](https://github.com/rust-lang/rust-clippy/pull/7400)
+* [`disallowed_types`]
+ [#7315](https://github.com/rust-lang/rust-clippy/pull/7315)
+* [`missing_enforced_import_renames`]
+ [#7300](https://github.com/rust-lang/rust-clippy/pull/7300)
+* [`extend_with_drain`]
+ [#7270](https://github.com/rust-lang/rust-clippy/pull/7270)
+
+### Moves and Deprecations
+
+* Moved [`from_iter_instead_of_collect`] to `pedantic`
+ [#7375](https://github.com/rust-lang/rust-clippy/pull/7375)
+* Added `suspicious` as a new lint group for *code that is most likely wrong or useless*
+ [#7350](https://github.com/rust-lang/rust-clippy/pull/7350)
+ * Moved [`blanket_clippy_restriction_lints`] to `suspicious`
+ * Moved [`empty_loop`] to `suspicious`
+ * Moved [`eval_order_dependence`] to `suspicious`
+ * Moved [`float_equality_without_abs`] to `suspicious`
+ * Moved [`for_loops_over_fallibles`] to `suspicious`
+ * Moved [`misrefactored_assign_op`] to `suspicious`
+ * Moved [`mut_range_bound`] to `suspicious`
+ * Moved [`mutable_key_type`] to `suspicious`
+ * Moved [`suspicious_arithmetic_impl`] to `suspicious`
+ * Moved [`suspicious_assignment_formatting`] to `suspicious`
+ * Moved [`suspicious_else_formatting`] to `suspicious`
+ * Moved [`suspicious_map`] to `suspicious`
+ * Moved [`suspicious_op_assign_impl`] to `suspicious`
+ * Moved [`suspicious_unary_op_formatting`] to `suspicious`
+
+### Enhancements
+
+* [`while_let_on_iterator`]: Now suggests `&mut iter` inside closures
+ [#7262](https://github.com/rust-lang/rust-clippy/pull/7262)
+* [`doc_markdown`]:
+ * Now detects unbalanced ticks
+ [#7357](https://github.com/rust-lang/rust-clippy/pull/7357)
+ * Add `FreeBSD` to the default configuration as an allowed identifier
+ [#7334](https://github.com/rust-lang/rust-clippy/pull/7334)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]: Now allows wildcards for enums with unstable
+ or hidden variants
+ [#7407](https://github.com/rust-lang/rust-clippy/pull/7407)
+* [`redundant_allocation`]: Now additionally supports the `Arc<>` type
+ [#7308](https://github.com/rust-lang/rust-clippy/pull/7308)
+* [`disallowed_names`]: Now allows disallowed names in test code
+ [#7379](https://github.com/rust-lang/rust-clippy/pull/7379)
+* [`redundant_closure`]: Suggests `&mut` for `FnMut`
+ [#7437](https://github.com/rust-lang/rust-clippy/pull/7437)
+* [`disallowed_methods`], [`disallowed_types`]: The configuration values `disallowed-method` and `disallowed-type`
+ no longer require fully qualified paths
+ [#7345](https://github.com/rust-lang/rust-clippy/pull/7345)
+* [`zst_offset`]: Fixed lint invocation after it was accidentally suppressed
+ [#7396](https://github.com/rust-lang/rust-clippy/pull/7396)
+
+### False Positive Fixes
+
+* [`default_numeric_fallback`]: No longer lints on float literals as function arguments
+ [#7446](https://github.com/rust-lang/rust-clippy/pull/7446)
+* [`use_self`]: No longer lints on type parameters
+ [#7288](https://github.com/rust-lang/rust-clippy/pull/7288)
+* [`unimplemented`]: Now ignores the `assert` and `debug_assert` macros
+ [#7439](https://github.com/rust-lang/rust-clippy/pull/7439)
+* [`branches_sharing_code`]: Now always checks for block expressions
+ [#7462](https://github.com/rust-lang/rust-clippy/pull/7462)
+* [`field_reassign_with_default`]: No longer triggers in macros
+ [#7160](https://github.com/rust-lang/rust-clippy/pull/7160)
+* [`redundant_clone`]: No longer lints on required clones for borrowed data
+ [#7346](https://github.com/rust-lang/rust-clippy/pull/7346)
+* [`default_numeric_fallback`]: No longer triggers in external macros
+ [#7325](https://github.com/rust-lang/rust-clippy/pull/7325)
+* [`needless_bool`]: No longer lints in macros
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`useless_format`]: No longer triggers when additional text is being appended
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`assertions_on_constants`]: `cfg!(...)` is no longer considered to be a constant
+ [#7319](https://github.com/rust-lang/rust-clippy/pull/7319)
+
+### Suggestion Fixes/Improvements
+
+* [`needless_collect`]: Now show correct lint messages for shadowed values
+ [#7289](https://github.com/rust-lang/rust-clippy/pull/7289)
+* [`wrong_pub_self_convention`]: The deprecated message now suggest the correct configuration value
+ [#7382](https://github.com/rust-lang/rust-clippy/pull/7382)
+* [`semicolon_if_nothing_returned`]: Allow missing semicolon in blocks with only one expression
+ [#7326](https://github.com/rust-lang/rust-clippy/pull/7326)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#7470](https://github.com/rust-lang/rust-clippy/pull/7470)
+* [`redundant_pattern_matching`]
+ [#7471](https://github.com/rust-lang/rust-clippy/pull/7471)
+* [`modulo_one`]
+ [#7473](https://github.com/rust-lang/rust-clippy/pull/7473)
+* [`use_self`]
+ [#7428](https://github.com/rust-lang/rust-clippy/pull/7428)
+
+## Rust 1.54
+
+Released 2021-07-29
+
+[7c7683c...3ae8faf](https://github.com/rust-lang/rust-clippy/compare/7c7683c...3ae8faf)
+
+### New Lints
+
+- [`ref_binding_to_reference`]
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`needless_bitwise_bool`]
+ [#7133](https://github.com/rust-lang/rust-clippy/pull/7133)
+- [`unused_async`] [#7225](https://github.com/rust-lang/rust-clippy/pull/7225)
+- [`manual_str_repeat`]
+ [#7265](https://github.com/rust-lang/rust-clippy/pull/7265)
+- [`suspicious_splitn`]
+ [#7292](https://github.com/rust-lang/rust-clippy/pull/7292)
+
+### Moves and Deprecations
+
+- Deprecate `pub_enum_variant_names` and `wrong_pub_self_convention` in favor of
+ the new `avoid-breaking-exported-api` config option (see
+ [Enhancements](#1-54-enhancements))
+ [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
+- Move [`inconsistent_struct_constructor`] to `pedantic`
+ [#7193](https://github.com/rust-lang/rust-clippy/pull/7193)
+- Move [`needless_borrow`] to `style` (now warn-by-default)
+ [#7254](https://github.com/rust-lang/rust-clippy/pull/7254)
+- Move [`suspicious_operation_groupings`] to `nursery`
+ [#7266](https://github.com/rust-lang/rust-clippy/pull/7266)
+- Move [`semicolon_if_nothing_returned`] to `pedantic`
+ [#7268](https://github.com/rust-lang/rust-clippy/pull/7268)
+
+### Enhancements <a name="1-54-enhancements"></a>
+
+- [`while_let_on_iterator`]: Now also lints in nested loops
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`single_char_pattern`]: Now also lints on `strip_prefix` and `strip_suffix`
+ [#7156](https://github.com/rust-lang/rust-clippy/pull/7156)
+- [`needless_collect`]: Now also lints on assignments with type annotations
+ [#7163](https://github.com/rust-lang/rust-clippy/pull/7163)
+- [`if_then_some_else_none`]: Now works with the MSRV config
+ [#7177](https://github.com/rust-lang/rust-clippy/pull/7177)
+- Add `avoid-breaking-exported-api` config option for the lints
+ [`enum_variant_names`], [`large_types_passed_by_value`],
+ [`trivially_copy_pass_by_ref`], [`unnecessary_wraps`],
+ [`upper_case_acronyms`], and [`wrong_self_convention`]. We recommend to set
+ this configuration option to `false` before a major release (1.0/2.0/...) to
+ clean up the API [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
+- [`needless_collect`]: Now lints on even more data structures
+ [#7188](https://github.com/rust-lang/rust-clippy/pull/7188)
+- [`missing_docs_in_private_items`]: No longer sees `#[<name> = "<value>"]` like
+ attributes as sufficient documentation
+ [#7281](https://github.com/rust-lang/rust-clippy/pull/7281)
+- [`needless_collect`], [`short_circuit_statement`], [`unnecessary_operation`]:
+ Now work as expected when used with `allow`
+ [#7282](https://github.com/rust-lang/rust-clippy/pull/7282)
+
+### False Positive Fixes
+
+- [`implicit_return`]: Now takes all diverging functions in account to avoid
+ false positives [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
+- [`while_let_on_iterator`]: No longer lints when the iterator is a struct field
+ and the struct is used in the loop
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`multiple_inherent_impl`]: No longer lints with generic arguments
+ [#7089](https://github.com/rust-lang/rust-clippy/pull/7089)
+- [`comparison_chain`]: No longer lints in a `const` context
+ [#7118](https://github.com/rust-lang/rust-clippy/pull/7118)
+- [`while_immutable_condition`]: Fix false positive where mutation in the loop
+ variable wasn't picked up
+ [#7144](https://github.com/rust-lang/rust-clippy/pull/7144)
+- [`default_trait_access`]: No longer lints in macros
+ [#7150](https://github.com/rust-lang/rust-clippy/pull/7150)
+- [`needless_question_mark`]: No longer lints when the inner value is implicitly
+ dereferenced [#7165](https://github.com/rust-lang/rust-clippy/pull/7165)
+- [`unused_unit`]: No longer lints when multiple macro contexts are involved
+ [#7167](https://github.com/rust-lang/rust-clippy/pull/7167)
+- [`eval_order_dependence`]: Fix false positive in async context
+ [#7174](https://github.com/rust-lang/rust-clippy/pull/7174)
+- [`unnecessary_filter_map`]: No longer lints if the `filter_map` changes the
+ type [#7175](https://github.com/rust-lang/rust-clippy/pull/7175)
+- [`wrong_self_convention`]: No longer lints in trait implementations of
+ non-`Copy` types [#7182](https://github.com/rust-lang/rust-clippy/pull/7182)
+- [`suboptimal_flops`]: No longer lints on `powi(2)`
+ [#7201](https://github.com/rust-lang/rust-clippy/pull/7201)
+- [`wrong_self_convention`]: No longer lints if there is no implicit `self`
+ [#7215](https://github.com/rust-lang/rust-clippy/pull/7215)
+- [`option_if_let_else`]: No longer lints on `else if let` pattern
+ [#7216](https://github.com/rust-lang/rust-clippy/pull/7216)
+- [`use_self`], [`useless_conversion`]: Fix false positives when generic
+ arguments are involved
+ [#7223](https://github.com/rust-lang/rust-clippy/pull/7223)
+- [`manual_unwrap_or`]: Fix false positive with deref coercion
+ [#7233](https://github.com/rust-lang/rust-clippy/pull/7233)
+- [`similar_names`]: No longer lints on `wparam`/`lparam`
+ [#7255](https://github.com/rust-lang/rust-clippy/pull/7255)
+- [`redundant_closure`]: No longer lints on using the `vec![]` macro in a
+ closure [#7263](https://github.com/rust-lang/rust-clippy/pull/7263)
+
+### Suggestion Fixes/Improvements
+
+- [`implicit_return`]
+ [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
+ - Fix suggestion for async functions
+ - Improve suggestion with macros
+ - Suggest to change `break` to `return` when appropriate
+- [`while_let_on_iterator`]: Now suggests `&mut iter` when necessary
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`match_single_binding`]: Improve suggestion when match scrutinee has side
+ effects [#7095](https://github.com/rust-lang/rust-clippy/pull/7095)
+- [`needless_borrow`]: Now suggests to also change usage sites as needed
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`write_with_newline`]: Improve suggestion when only `\n` is written to the
+ buffer [#7183](https://github.com/rust-lang/rust-clippy/pull/7183)
+- [`from_iter_instead_of_collect`]: The suggestion is now auto applicable also
+ when a `<_ as Trait>::_` is involved
+ [#7264](https://github.com/rust-lang/rust-clippy/pull/7264)
+- [`not_unsafe_ptr_arg_deref`]: Improved error message
+ [#7294](https://github.com/rust-lang/rust-clippy/pull/7294)
+
+### ICE Fixes
+
+- Fix ICE when running Clippy on `libstd`
+ [#7140](https://github.com/rust-lang/rust-clippy/pull/7140)
+- [`implicit_return`]
+ [#7242](https://github.com/rust-lang/rust-clippy/pull/7242)
+
+## Rust 1.53
+
+Released 2021-06-17
+
+[6ed6f1e...7c7683c](https://github.com/rust-lang/rust-clippy/compare/6ed6f1e...7c7683c)
+
+### New Lints
+
+* [`option_filter_map`]
+ [#6342](https://github.com/rust-lang/rust-clippy/pull/6342)
+* [`branches_sharing_code`]
+ [#6463](https://github.com/rust-lang/rust-clippy/pull/6463)
+* [`needless_for_each`]
+ [#6706](https://github.com/rust-lang/rust-clippy/pull/6706)
+* [`if_then_some_else_none`]
+ [#6859](https://github.com/rust-lang/rust-clippy/pull/6859)
+* [`non_octal_unix_permissions`]
+ [#7001](https://github.com/rust-lang/rust-clippy/pull/7001)
+* [`unnecessary_self_imports`]
+ [#7072](https://github.com/rust-lang/rust-clippy/pull/7072)
+* [`bool_assert_comparison`]
+ [#7083](https://github.com/rust-lang/rust-clippy/pull/7083)
+* [`cloned_instead_of_copied`]
+ [#7098](https://github.com/rust-lang/rust-clippy/pull/7098)
+* [`flat_map_option`]
+ [#7101](https://github.com/rust-lang/rust-clippy/pull/7101)
+
+### Moves and Deprecations
+
+* Deprecate [`filter_map`] lint
+ [#7059](https://github.com/rust-lang/rust-clippy/pull/7059)
+* Move [`transmute_ptr_to_ptr`] to `pedantic`
+ [#7102](https://github.com/rust-lang/rust-clippy/pull/7102)
+
+### Enhancements
+
+* [`mem_replace_with_default`]: Also lint on common std constructors
+ [#6820](https://github.com/rust-lang/rust-clippy/pull/6820)
+* [`wrong_self_convention`]: Also lint on `to_*_mut` methods
+ [#6828](https://github.com/rust-lang/rust-clippy/pull/6828)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]:
+ [#6863](https://github.com/rust-lang/rust-clippy/pull/6863)
+ * Attempt to find a common path prefix in suggestion
+ * Don't lint on `Option` and `Result`
+ * Consider `Self` prefix
+* [`explicit_deref_methods`]: Also lint on chained `deref` calls
+ [#6865](https://github.com/rust-lang/rust-clippy/pull/6865)
+* [`or_fun_call`]: Also lint on `unsafe` blocks
+ [#6928](https://github.com/rust-lang/rust-clippy/pull/6928)
+* [`vec_box`], [`linkedlist`], [`option_option`]: Also lint in `const` and
+ `static` items [#6938](https://github.com/rust-lang/rust-clippy/pull/6938)
+* [`search_is_some`]: Also check for `is_none`
+ [#6942](https://github.com/rust-lang/rust-clippy/pull/6942)
+* [`string_lit_as_bytes`]: Also lint on `into_bytes`
+ [#6959](https://github.com/rust-lang/rust-clippy/pull/6959)
+* [`len_without_is_empty`]: Also lint if function signatures of `len` and
+ `is_empty` don't match
+ [#6980](https://github.com/rust-lang/rust-clippy/pull/6980)
+* [`redundant_pattern_matching`]: Also lint if the pattern is a `&` pattern
+ [#6991](https://github.com/rust-lang/rust-clippy/pull/6991)
+* [`clone_on_copy`]: Also lint on chained method calls taking `self` by value
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`missing_panics_doc`]: Also lint on `assert_eq!` and `assert_ne!`
+ [#7029](https://github.com/rust-lang/rust-clippy/pull/7029)
+* [`needless_return`]: Also lint in `async` functions
+ [#7067](https://github.com/rust-lang/rust-clippy/pull/7067)
+* [`unused_io_amount`]: Also lint on expressions like `_.read().ok()?`
+ [#7100](https://github.com/rust-lang/rust-clippy/pull/7100)
+* [`iter_cloned_collect`]: Also lint on large arrays, since const-generics are
+ now stable [#7138](https://github.com/rust-lang/rust-clippy/pull/7138)
+
+### False Positive Fixes
+
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6805](https://github.com/rust-lang/rust-clippy/pull/6805)
+* [`suspicious_map`]: No longer lints when side effects may occur inside the
+ `map` call [#6831](https://github.com/rust-lang/rust-clippy/pull/6831)
+* [`manual_map`], [`manual_unwrap_or`]: No longer lints in `const` functions
+ [#6917](https://github.com/rust-lang/rust-clippy/pull/6917)
+* [`wrong_self_convention`]: Now respects `Copy` types
+ [#6924](https://github.com/rust-lang/rust-clippy/pull/6924)
+* [`needless_question_mark`]: No longer lints if the `?` and the `Some(..)` come
+ from different macro contexts [#6935](https://github.com/rust-lang/rust-clippy/pull/6935)
+* [`map_entry`]: Better detect if the entry API can be used
+ [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`or_fun_call`]: No longer lints on some `len` function calls
+ [#6950](https://github.com/rust-lang/rust-clippy/pull/6950)
+* [`new_ret_no_self`]: No longer lints when `Self` is returned with different
+ generic arguments [#6952](https://github.com/rust-lang/rust-clippy/pull/6952)
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6981](https://github.com/rust-lang/rust-clippy/pull/6981)
+* [`explicit_into_iter_loop`]: Only lint when `into_iter` is an implementation
+ of `IntoIterator` [#6982](https://github.com/rust-lang/rust-clippy/pull/6982)
+* [`expl_impl_clone_on_copy`]: Take generic constraints into account before
+ suggesting to use `derive` instead
+ [#6993](https://github.com/rust-lang/rust-clippy/pull/6993)
+* [`missing_panics_doc`]: No longer lints when only debug-assertions are used
+ [#6996](https://github.com/rust-lang/rust-clippy/pull/6996)
+* [`clone_on_copy`]: Only lint when using the `Clone` trait
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`wrong_self_convention`]: No longer lints inside a trait implementation
+ [#7002](https://github.com/rust-lang/rust-clippy/pull/7002)
+* [`redundant_clone`]: No longer lints when the cloned value is modified while
+ the clone is in use
+ [#7011](https://github.com/rust-lang/rust-clippy/pull/7011)
+* [`same_item_push`]: No longer lints if the `Vec` is used in the loop body
+ [#7018](https://github.com/rust-lang/rust-clippy/pull/7018)
+* [`cargo_common_metadata`]: Remove author requirement
+ [#7026](https://github.com/rust-lang/rust-clippy/pull/7026)
+* [`panic_in_result_fn`]: No longer lints on `debug_assert` family
+ [#7060](https://github.com/rust-lang/rust-clippy/pull/7060)
+* [`panic`]: No longer wrongfully lints on `debug_assert` with message
+ [#7063](https://github.com/rust-lang/rust-clippy/pull/7063)
+* [`wrong_self_convention`]: No longer lints in trait implementations where no
+ `self` is involved [#7064](https://github.com/rust-lang/rust-clippy/pull/7064)
+* [`missing_const_for_fn`]: No longer lints when unstable `const` function is
+ involved [#7076](https://github.com/rust-lang/rust-clippy/pull/7076)
+* [`suspicious_else_formatting`]: Allow Allman style braces
+ [#7087](https://github.com/rust-lang/rust-clippy/pull/7087)
+* [`inconsistent_struct_constructor`]: No longer lints in macros
+ [#7097](https://github.com/rust-lang/rust-clippy/pull/7097)
+* [`single_component_path_imports`]: No longer lints on macro re-exports
+ [#7120](https://github.com/rust-lang/rust-clippy/pull/7120)
+
+### Suggestion Fixes/Improvements
+
+* [`redundant_pattern_matching`]: Add a note when applying this lint would
+ change the drop order
+ [#6568](https://github.com/rust-lang/rust-clippy/pull/6568)
+* [`write_literal`], [`print_literal`]: Add auto-applicable suggestion
+ [#6821](https://github.com/rust-lang/rust-clippy/pull/6821)
+* [`manual_map`]: Fix suggestion for complex `if let ... else` chains
+ [#6856](https://github.com/rust-lang/rust-clippy/pull/6856)
+* [`inconsistent_struct_constructor`]: Make lint description and message clearer
+ [#6892](https://github.com/rust-lang/rust-clippy/pull/6892)
+* [`map_entry`]: Now suggests `or_insert`, `insert_with` or `match _.entry(_)`
+ as appropriate [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`manual_flatten`]: Suggest to insert `copied` if necessary
+ [#6962](https://github.com/rust-lang/rust-clippy/pull/6962)
+* [`redundant_slicing`]: Fix suggestion when a re-borrow might be required or
+ when the value is from a macro call
+ [#6975](https://github.com/rust-lang/rust-clippy/pull/6975)
+* [`match_wildcard_for_single_variants`]: Fix suggestion for hidden variant
+ [#6988](https://github.com/rust-lang/rust-clippy/pull/6988)
+* [`clone_on_copy`]: Correct suggestion when the cloned value is a macro call
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`manual_map`]: Fix suggestion at the end of an if chain
+ [#7004](https://github.com/rust-lang/rust-clippy/pull/7004)
+* Fix needless parenthesis output in multiple lint suggestions
+ [#7013](https://github.com/rust-lang/rust-clippy/pull/7013)
+* [`needless_collect`]: Better explanation in the lint message
+ [#7020](https://github.com/rust-lang/rust-clippy/pull/7020)
+* [`useless_vec`]: Now considers mutability
+ [#7036](https://github.com/rust-lang/rust-clippy/pull/7036)
+* [`useless_format`]: Wrap the content in braces if necessary
+ [#7092](https://github.com/rust-lang/rust-clippy/pull/7092)
+* [`single_match`]: Don't suggest an equality check for types which don't
+ implement `PartialEq`
+ [#7093](https://github.com/rust-lang/rust-clippy/pull/7093)
+* [`from_over_into`]: Mention type in help message
+ [#7099](https://github.com/rust-lang/rust-clippy/pull/7099)
+* [`manual_unwrap_or`]: Fix invalid code suggestion due to a macro call
+ [#7136](https://github.com/rust-lang/rust-clippy/pull/7136)
+
+### ICE Fixes
+
+* [`macro_use_imports`]
+ [#7022](https://github.com/rust-lang/rust-clippy/pull/7022)
+* [`missing_panics_doc`]
+ [#7034](https://github.com/rust-lang/rust-clippy/pull/7034)
+* [`tabs_in_doc_comments`]
+ [#7039](https://github.com/rust-lang/rust-clippy/pull/7039)
+* [`missing_const_for_fn`]
+ [#7128](https://github.com/rust-lang/rust-clippy/pull/7128)
+
+### Others
+
+* [Clippy's lint
+ list](https://rust-lang.github.io/rust-clippy/master/index.html) now supports
+ themes [#7030](https://github.com/rust-lang/rust-clippy/pull/7030)
+* Lints that were uplifted to `rustc` now mention the new `rustc` name in the
+ deprecation warning
+ [#7056](https://github.com/rust-lang/rust-clippy/pull/7056)
+
+## Rust 1.52
+
+Released 2021-05-06
+
+[3e41797...6ed6f1e](https://github.com/rust-lang/rust-clippy/compare/3e41797...6ed6f1e)
+
+### New Lints
+
+* [`from_str_radix_10`]
+ [#6717](https://github.com/rust-lang/rust-clippy/pull/6717)
+* [`implicit_clone`]
+ [#6730](https://github.com/rust-lang/rust-clippy/pull/6730)
+* [`semicolon_if_nothing_returned`]
+ [#6681](https://github.com/rust-lang/rust-clippy/pull/6681)
+* [`manual_flatten`]
+ [#6646](https://github.com/rust-lang/rust-clippy/pull/6646)
+* [`inconsistent_struct_constructor`]
+ [#6769](https://github.com/rust-lang/rust-clippy/pull/6769)
+* [`iter_count`]
+ [#6791](https://github.com/rust-lang/rust-clippy/pull/6791)
+* [`default_numeric_fallback`]
+ [#6662](https://github.com/rust-lang/rust-clippy/pull/6662)
+* [`bytes_nth`]
+ [#6695](https://github.com/rust-lang/rust-clippy/pull/6695)
+* [`filter_map_identity`]
+ [#6685](https://github.com/rust-lang/rust-clippy/pull/6685)
+* [`manual_map`]
+ [#6573](https://github.com/rust-lang/rust-clippy/pull/6573)
+
+### Moves and Deprecations
+
+* Moved [`upper_case_acronyms`] to `pedantic`
+ [#6775](https://github.com/rust-lang/rust-clippy/pull/6775)
+* Moved [`manual_map`] to `nursery`
+ [#6796](https://github.com/rust-lang/rust-clippy/pull/6796)
+* Moved [`unnecessary_wraps`] to `pedantic`
+ [#6765](https://github.com/rust-lang/rust-clippy/pull/6765)
+* Moved [`trivial_regex`] to `nursery`
+ [#6696](https://github.com/rust-lang/rust-clippy/pull/6696)
+* Moved [`naive_bytecount`] to `pedantic`
+ [#6825](https://github.com/rust-lang/rust-clippy/pull/6825)
+* Moved [`upper_case_acronyms`] to `style`
+ [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
+* Moved [`manual_map`] to `style`
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+
+### Enhancements
+
+* [`disallowed_methods`]: Now supports functions in addition to methods
+ [#6674](https://github.com/rust-lang/rust-clippy/pull/6674)
+* [`upper_case_acronyms`]: Added a new configuration `upper-case-acronyms-aggressive` to
+ trigger the lint if there is more than one uppercase character next to each other
+ [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
+* [`collapsible_match`]: Now supports block comparison with different value names
+ [#6754](https://github.com/rust-lang/rust-clippy/pull/6754)
+* [`unnecessary_wraps`]: Will now suggest removing unnecessary wrapped return unit type, like `Option<()>`
+ [#6665](https://github.com/rust-lang/rust-clippy/pull/6665)
+* Improved value usage detection in closures
+ [#6698](https://github.com/rust-lang/rust-clippy/pull/6698)
+
+### False Positive Fixes
+
+* [`use_self`]: No longer lints in macros
+ [#6833](https://github.com/rust-lang/rust-clippy/pull/6833)
+* [`use_self`]: Fixed multiple false positives for: generics, associated types and derive implementations
+ [#6179](https://github.com/rust-lang/rust-clippy/pull/6179)
+* [`missing_inline_in_public_items`]: No longer lints for procedural macros
+ [#6814](https://github.com/rust-lang/rust-clippy/pull/6814)
+* [`inherent_to_string`]: No longer lints on functions with function generics
+ [#6771](https://github.com/rust-lang/rust-clippy/pull/6771)
+* [`doc_markdown`]: Add `OpenDNS` to the default configuration as an allowed identifier
+ [#6783](https://github.com/rust-lang/rust-clippy/pull/6783)
+* [`missing_panics_doc`]: No longer lints on [`unreachable!`](https://doc.rust-lang.org/std/macro.unreachable.html)
+ [#6700](https://github.com/rust-lang/rust-clippy/pull/6700)
+* [`collapsible_if`]: No longer lints on if statements with attributes
+ [#6701](https://github.com/rust-lang/rust-clippy/pull/6701)
+* [`match_same_arms`]: Only considers empty blocks as equal if the tokens contained are the same
+ [#6843](https://github.com/rust-lang/rust-clippy/pull/6843)
+* [`redundant_closure`]: Now ignores macros
+ [#6871](https://github.com/rust-lang/rust-clippy/pull/6871)
+* [`manual_map`]: Fixed false positives when control flow statements like `return`, `break` etc. are used
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* [`vec_init_then_push`]: Fixed false positives for loops and if statements
+ [#6697](https://github.com/rust-lang/rust-clippy/pull/6697)
+* [`len_without_is_empty`]: Will now consider multiple impl blocks and `#[allow]` on
+ the `len` method as well as the type definition.
+ [#6853](https://github.com/rust-lang/rust-clippy/pull/6853)
+* [`let_underscore_drop`]: Only lints on types which implement `Drop`
+ [#6682](https://github.com/rust-lang/rust-clippy/pull/6682)
+* [`unit_arg`]: No longer lints on unit arguments when they come from a path expression.
+ [#6601](https://github.com/rust-lang/rust-clippy/pull/6601)
+* [`cargo_common_metadata`]: No longer lints if
+ [`publish = false`](https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field)
+ is defined in the manifest
+ [#6650](https://github.com/rust-lang/rust-clippy/pull/6650)
+
+### Suggestion Fixes/Improvements
+
+* [`collapsible_match`]: Fixed lint message capitalization
+ [#6766](https://github.com/rust-lang/rust-clippy/pull/6766)
+* [`or_fun_call`]: Improved suggestions for `or_insert(vec![])`
+ [#6790](https://github.com/rust-lang/rust-clippy/pull/6790)
+* [`manual_map`]: No longer expands macros in the suggestions
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* Aligned Clippy's lint messages with the rustc dev guide
+ [#6787](https://github.com/rust-lang/rust-clippy/pull/6787)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6866](https://github.com/rust-lang/rust-clippy/pull/6866)
+
+### Documentation Improvements
+
+* [`useless_format`]: Improved the documentation example
+ [#6854](https://github.com/rust-lang/rust-clippy/pull/6854)
+* Clippy's [`README.md`]: Includes a new subsection on running Clippy as a rustc wrapper
+ [#6782](https://github.com/rust-lang/rust-clippy/pull/6782)
+
+### Others
+* Running `cargo clippy` after `cargo check` now works as expected
+ (`cargo clippy` and `cargo check` no longer shares the same build cache)
+ [#6687](https://github.com/rust-lang/rust-clippy/pull/6687)
+* Cargo now re-runs Clippy if arguments after `--` provided to `cargo clippy` are changed.
+ [#6834](https://github.com/rust-lang/rust-clippy/pull/6834)
+* Extracted Clippy's `utils` module into the new `clippy_utils` crate
+ [#6756](https://github.com/rust-lang/rust-clippy/pull/6756)
+* Clippy lintcheck tool improvements
+ [#6800](https://github.com/rust-lang/rust-clippy/pull/6800)
+ [#6735](https://github.com/rust-lang/rust-clippy/pull/6735)
+ [#6764](https://github.com/rust-lang/rust-clippy/pull/6764)
+ [#6708](https://github.com/rust-lang/rust-clippy/pull/6708)
+ [#6780](https://github.com/rust-lang/rust-clippy/pull/6780)
+ [#6686](https://github.com/rust-lang/rust-clippy/pull/6686)
+
+## Rust 1.51
+
+Released 2021-03-25
+
+[4911ab1...3e41797](https://github.com/rust-lang/rust-clippy/compare/4911ab1...3e41797)
+
+### New Lints
+
+* [`upper_case_acronyms`]
+ [#6475](https://github.com/rust-lang/rust-clippy/pull/6475)
+* [`from_over_into`] [#6476](https://github.com/rust-lang/rust-clippy/pull/6476)
+* [`case_sensitive_file_extension_comparisons`]
+ [#6500](https://github.com/rust-lang/rust-clippy/pull/6500)
+* [`needless_question_mark`]
+ [#6507](https://github.com/rust-lang/rust-clippy/pull/6507)
+* [`missing_panics_doc`]
+ [#6523](https://github.com/rust-lang/rust-clippy/pull/6523)
+* [`redundant_slicing`]
+ [#6528](https://github.com/rust-lang/rust-clippy/pull/6528)
+* [`vec_init_then_push`]
+ [#6538](https://github.com/rust-lang/rust-clippy/pull/6538)
+* [`ptr_as_ptr`] [#6542](https://github.com/rust-lang/rust-clippy/pull/6542)
+* [`collapsible_else_if`] (split out from `collapsible_if`)
+ [#6544](https://github.com/rust-lang/rust-clippy/pull/6544)
+* [`inspect_for_each`] [#6577](https://github.com/rust-lang/rust-clippy/pull/6577)
+* [`manual_filter_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* [`exhaustive_enums`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+* [`exhaustive_structs`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+
+### Moves and Deprecations
+
+* Replace [`find_map`] with [`manual_find_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* `unknown_clippy_lints` Now integrated in the `unknown_lints` rustc lint
+ [#6653](https://github.com/rust-lang/rust-clippy/pull/6653)
+
+### Enhancements
+
+* [`ptr_arg`] Now also suggests to use `&Path` instead of `&PathBuf`
+ [#6506](https://github.com/rust-lang/rust-clippy/pull/6506)
+* [`cast_ptr_alignment`] Also lint when the `pointer::cast` method is used
+ [#6557](https://github.com/rust-lang/rust-clippy/pull/6557)
+* [`collapsible_match`] Now also deals with `&` and `*` operators in the `match`
+ scrutinee [#6619](https://github.com/rust-lang/rust-clippy/pull/6619)
+
+### False Positive Fixes
+
+* [`similar_names`] Ignore underscore prefixed names
+ [#6403](https://github.com/rust-lang/rust-clippy/pull/6403)
+* [`print_literal`] and [`write_literal`] No longer lint numeric literals
+ [#6408](https://github.com/rust-lang/rust-clippy/pull/6408)
+* [`large_enum_variant`] No longer lints in external macros
+ [#6485](https://github.com/rust-lang/rust-clippy/pull/6485)
+* [`empty_enum`] Only lint if `never_type` feature is enabled
+ [#6513](https://github.com/rust-lang/rust-clippy/pull/6513)
+* [`field_reassign_with_default`] No longer lints in macros
+ [#6553](https://github.com/rust-lang/rust-clippy/pull/6553)
+* [`size_of_in_element_count`] No longer lints when dividing by element size
+ [#6578](https://github.com/rust-lang/rust-clippy/pull/6578)
+* [`needless_return`] No longer lints in macros
+ [#6586](https://github.com/rust-lang/rust-clippy/pull/6586)
+* [`match_overlapping_arm`] No longer lint when first arm is completely included
+ in second arm [#6603](https://github.com/rust-lang/rust-clippy/pull/6603)
+* [`doc_markdown`] Add `WebGL` to the default configuration as an allowed
+ identifier [#6605](https://github.com/rust-lang/rust-clippy/pull/6605)
+
+### Suggestion Fixes/Improvements
+
+* [`field_reassign_with_default`] Don't expand macro in lint suggestion
+ [#6531](https://github.com/rust-lang/rust-clippy/pull/6531)
+* [`match_like_matches_macro`] Strip references in suggestion
+ [#6532](https://github.com/rust-lang/rust-clippy/pull/6532)
+* [`single_match`] Suggest `if` over `if let` when possible
+ [#6574](https://github.com/rust-lang/rust-clippy/pull/6574)
+* `ref_in_deref` Use parentheses correctly in suggestion
+ [#6609](https://github.com/rust-lang/rust-clippy/pull/6609)
+* [`stable_sort_primitive`] Clarify error message
+ [#6611](https://github.com/rust-lang/rust-clippy/pull/6611)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6582](https://github.com/rust-lang/rust-clippy/pull/6582)
+
+### Documentation Improvements
+
+* Improve search performance on the Clippy website and make it possible to
+ directly search for lints on the GitHub issue tracker
+ [#6483](https://github.com/rust-lang/rust-clippy/pull/6483)
+* Clean up `README.md` by removing outdated paragraph
+ [#6488](https://github.com/rust-lang/rust-clippy/pull/6488)
+* [`await_holding_refcell_ref`] and [`await_holding_lock`]
+ [#6585](https://github.com/rust-lang/rust-clippy/pull/6585)
+* [`as_conversions`] [#6608](https://github.com/rust-lang/rust-clippy/pull/6608)
+
+### Others
+
+* Clippy now has a [Roadmap] for 2021. If you like to get involved in a bigger
+ project, take a look at the [Roadmap project page]. All issues listed there
+ are actively mentored
+ [#6462](https://github.com/rust-lang/rust-clippy/pull/6462)
+* The Clippy version number now corresponds to the Rust version number
+ [#6526](https://github.com/rust-lang/rust-clippy/pull/6526)
+* Fix oversight which caused Clippy to lint deps in some environments, where
+ `CLIPPY_TESTS=true` was set somewhere
+ [#6575](https://github.com/rust-lang/rust-clippy/pull/6575)
+* Add `cargo dev-lintcheck` tool to the Clippy Dev Tool
+ [#6469](https://github.com/rust-lang/rust-clippy/pull/6469)
+
+[Roadmap]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/proposals/roadmap-2021.md
+[Roadmap project page]: https://github.com/rust-lang/rust-clippy/projects/3
+
+## Rust 1.50
+
+Released 2021-02-11
+
+[b20d4c1...4bd77a1](https://github.com/rust-lang/rust-clippy/compare/b20d4c1...4bd77a1)
+
+### New Lints
+
+* [`suspicious_operation_groupings`] [#6086](https://github.com/rust-lang/rust-clippy/pull/6086)
+* [`size_of_in_element_count`] [#6394](https://github.com/rust-lang/rust-clippy/pull/6394)
+* [`unnecessary_wraps`] [#6070](https://github.com/rust-lang/rust-clippy/pull/6070)
+* [`let_underscore_drop`] [#6305](https://github.com/rust-lang/rust-clippy/pull/6305)
+* [`collapsible_match`] [#6402](https://github.com/rust-lang/rust-clippy/pull/6402)
+* [`redundant_else`] [#6330](https://github.com/rust-lang/rust-clippy/pull/6330)
+* [`zero_sized_map_values`] [#6218](https://github.com/rust-lang/rust-clippy/pull/6218)
+* [`print_stderr`] [#6367](https://github.com/rust-lang/rust-clippy/pull/6367)
+* [`string_from_utf8_as_bytes`] [#6134](https://github.com/rust-lang/rust-clippy/pull/6134)
+
+### Moves and Deprecations
+
+* Previously deprecated [`str_to_string`] and [`string_to_string`] have been un-deprecated
+ as `restriction` lints [#6333](https://github.com/rust-lang/rust-clippy/pull/6333)
+* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panics`
+ [#6351](https://github.com/rust-lang/rust-clippy/pull/6351)
+* Move [`map_err_ignore`] to `restriction`
+ [#6416](https://github.com/rust-lang/rust-clippy/pull/6416)
+* Move [`await_holding_refcell_ref`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+* Move [`await_holding_lock`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+
+### Enhancements
+
+* Add the `unreadable-literal-lint-fractions` configuration to disable
+ the `unreadable_literal` lint for fractions
+ [#6421](https://github.com/rust-lang/rust-clippy/pull/6421)
+* [`clone_on_copy`]: Now shows the type in the lint message
+ [#6443](https://github.com/rust-lang/rust-clippy/pull/6443)
+* [`redundant_pattern_matching`]: Now also lints on `std::task::Poll`
+ [#6339](https://github.com/rust-lang/rust-clippy/pull/6339)
+* [`redundant_pattern_matching`]: Additionally also lints on `std::net::IpAddr`
+ [#6377](https://github.com/rust-lang/rust-clippy/pull/6377)
+* [`search_is_some`]: Now suggests `contains` instead of `find(foo).is_some()`
+ [#6119](https://github.com/rust-lang/rust-clippy/pull/6119)
+* [`clone_double_ref`]: Now prints the reference type in the lint message
+ [#6442](https://github.com/rust-lang/rust-clippy/pull/6442)
+* [`modulo_one`]: Now also lints on -1.
+ [#6360](https://github.com/rust-lang/rust-clippy/pull/6360)
+* [`empty_loop`]: Now lints no_std crates, too
+ [#6205](https://github.com/rust-lang/rust-clippy/pull/6205)
+* [`or_fun_call`]: Now also lints when indexing `HashMap` or `BTreeMap`
+ [#6267](https://github.com/rust-lang/rust-clippy/pull/6267)
+* [`wrong_self_convention`]: Now also lints in trait definitions
+ [#6316](https://github.com/rust-lang/rust-clippy/pull/6316)
+* [`needless_borrow`]: Print the type in the lint message
+ [#6449](https://github.com/rust-lang/rust-clippy/pull/6449)
+
+[msrv_readme]: https://github.com/rust-lang/rust-clippy#specifying-the-minimum-supported-rust-version
+
+### False Positive Fixes
+
+* [`manual_range_contains`]: No longer lints in `const fn`
+ [#6382](https://github.com/rust-lang/rust-clippy/pull/6382)
+* [`unnecessary_lazy_evaluations`]: No longer lints if closure argument is used
+ [#6370](https://github.com/rust-lang/rust-clippy/pull/6370)
+* [`match_single_binding`]: Now ignores cases with `#[cfg()]` macros
+ [#6435](https://github.com/rust-lang/rust-clippy/pull/6435)
+* [`match_like_matches_macro`]: No longer lints on arms with attributes
+ [#6290](https://github.com/rust-lang/rust-clippy/pull/6290)
+* [`map_clone`]: No longer lints with deref and clone
+ [#6269](https://github.com/rust-lang/rust-clippy/pull/6269)
+* [`map_clone`]: No longer lints in the case of &mut
+ [#6301](https://github.com/rust-lang/rust-clippy/pull/6301)
+* [`needless_update`]: Now ignores `non_exhaustive` structs
+ [#6464](https://github.com/rust-lang/rust-clippy/pull/6464)
+* [`needless_collect`]: No longer lints when a collect is needed multiple times
+ [#6313](https://github.com/rust-lang/rust-clippy/pull/6313)
+* [`unnecessary_cast`] No longer lints cfg-dependent types
+ [#6369](https://github.com/rust-lang/rust-clippy/pull/6369)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]:
+ Both now ignore enums with frozen variants
+ [#6110](https://github.com/rust-lang/rust-clippy/pull/6110)
+* [`field_reassign_with_default`] No longer lint for private fields
+ [#6537](https://github.com/rust-lang/rust-clippy/pull/6537)
+
+
+### Suggestion Fixes/Improvements
+
+* [`vec_box`]: Provide correct type scope suggestion
+ [#6271](https://github.com/rust-lang/rust-clippy/pull/6271)
+* [`manual_range_contains`]: Give correct suggestion when using floats
+ [#6320](https://github.com/rust-lang/rust-clippy/pull/6320)
+* [`unnecessary_lazy_evaluations`]: Don't always mark suggestion as MachineApplicable
+ [#6272](https://github.com/rust-lang/rust-clippy/pull/6272)
+* [`manual_async_fn`]: Improve suggestion formatting
+ [#6294](https://github.com/rust-lang/rust-clippy/pull/6294)
+* [`unnecessary_cast`]: Fix incorrectly formatted float literal suggestion
+ [#6362](https://github.com/rust-lang/rust-clippy/pull/6362)
+
+### ICE Fixes
+
+* Fix a crash in [`from_iter_instead_of_collect`]
+ [#6304](https://github.com/rust-lang/rust-clippy/pull/6304)
+* Fix a silent crash when parsing doc comments in [`needless_doctest_main`]
+ [#6458](https://github.com/rust-lang/rust-clippy/pull/6458)
+
+### Documentation Improvements
+
+* The lint website search has been improved ([#6477](https://github.com/rust-lang/rust-clippy/pull/6477)):
+ * Searching for lints with dashes and spaces is possible now. For example
+ `missing-errors-doc` and `missing errors doc` are now valid aliases for lint names
+ * Improved fuzzy search in lint descriptions
+* Various README improvements
+ [#6287](https://github.com/rust-lang/rust-clippy/pull/6287)
+* Add known problems to [`comparison_chain`] documentation
+ [#6390](https://github.com/rust-lang/rust-clippy/pull/6390)
+* Fix example used in [`cargo_common_metadata`]
+ [#6293](https://github.com/rust-lang/rust-clippy/pull/6293)
+* Improve [`map_clone`] documentation
+ [#6340](https://github.com/rust-lang/rust-clippy/pull/6340)
+
+### Others
+
+* You can now tell Clippy about the MSRV your project supports. Please refer to
+ the specific README section to learn more about MSRV support [here][msrv_readme]
+ [#6201](https://github.com/rust-lang/rust-clippy/pull/6201)
+* Add `--no-deps` option to avoid running on path dependencies in workspaces
+ [#6188](https://github.com/rust-lang/rust-clippy/pull/6188)
+
+## Rust 1.49
+
+Released 2020-12-31
+
+[e636b88...b20d4c1](https://github.com/rust-lang/rust-clippy/compare/e636b88...b20d4c1)
+
+### New Lints
+
+* [`field_reassign_with_default`] [#5911](https://github.com/rust-lang/rust-clippy/pull/5911)
+* [`await_holding_refcell_ref`] [#6029](https://github.com/rust-lang/rust-clippy/pull/6029)
+* [`disallowed_methods`] [#6081](https://github.com/rust-lang/rust-clippy/pull/6081)
+* [`inline_asm_x86_att_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`inline_asm_x86_intel_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`from_iter_instead_of_collect`] [#6101](https://github.com/rust-lang/rust-clippy/pull/6101)
+* [`mut_mutex_lock`] [#6103](https://github.com/rust-lang/rust-clippy/pull/6103)
+* [`single_element_loop`] [#6109](https://github.com/rust-lang/rust-clippy/pull/6109)
+* [`manual_unwrap_or`] [#6123](https://github.com/rust-lang/rust-clippy/pull/6123)
+* [`large_types_passed_by_value`] [#6135](https://github.com/rust-lang/rust-clippy/pull/6135)
+* [`result_unit_err`] [#6157](https://github.com/rust-lang/rust-clippy/pull/6157)
+* [`ref_option_ref`] [#6165](https://github.com/rust-lang/rust-clippy/pull/6165)
+* [`manual_range_contains`] [#6177](https://github.com/rust-lang/rust-clippy/pull/6177)
+* [`unusual_byte_groupings`] [#6183](https://github.com/rust-lang/rust-clippy/pull/6183)
+* [`comparison_to_empty`] [#6226](https://github.com/rust-lang/rust-clippy/pull/6226)
+* [`map_collect_result_unit`] [#6227](https://github.com/rust-lang/rust-clippy/pull/6227)
+* [`manual_ok_or`] [#6233](https://github.com/rust-lang/rust-clippy/pull/6233)
+
+### Moves and Deprecations
+
+* Rename `single_char_push_str` to [`single_char_add_str`]
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* Rename `zero_width_space` to [`invisible_characters`]
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* Deprecate `drop_bounds` (uplifted)
+ [#6111](https://github.com/rust-lang/rust-clippy/pull/6111)
+* Move [`string_lit_as_bytes`] to `nursery`
+ [#6117](https://github.com/rust-lang/rust-clippy/pull/6117)
+* Move [`rc_buffer`] to `restriction`
+ [#6128](https://github.com/rust-lang/rust-clippy/pull/6128)
+
+### Enhancements
+
+* [`manual_memcpy`]: Also lint when there are loop counters (and produce a
+ reliable suggestion)
+ [#5727](https://github.com/rust-lang/rust-clippy/pull/5727)
+* [`single_char_add_str`]: Also lint on `String::insert_str`
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* [`invisible_characters`]: Also lint the characters `\u{AD}` and `\u{2060}`
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* [`eq_op`]: Also lint on the `assert_*!` macro family
+ [#6167](https://github.com/rust-lang/rust-clippy/pull/6167)
+* [`items_after_statements`]: Also lint in local macro expansions
+ [#6176](https://github.com/rust-lang/rust-clippy/pull/6176)
+* [`unnecessary_cast`]: Also lint casts on integer and float literals
+ [#6187](https://github.com/rust-lang/rust-clippy/pull/6187)
+* [`manual_unwrap_or`]: Also lint `Result::unwrap_or`
+ [#6190](https://github.com/rust-lang/rust-clippy/pull/6190)
+* [`match_like_matches_macro`]: Also lint when `match` has more than two arms
+ [#6216](https://github.com/rust-lang/rust-clippy/pull/6216)
+* [`integer_arithmetic`]: Better handle `/` an `%` operators
+ [#6229](https://github.com/rust-lang/rust-clippy/pull/6229)
+
+### False Positive Fixes
+
+* [`needless_lifetimes`]: Bail out if the function has a `where` clause with the
+ lifetime [#5978](https://github.com/rust-lang/rust-clippy/pull/5978)
+* [`explicit_counter_loop`]: No longer lints, when loop counter is used after it
+ is incremented [#6076](https://github.com/rust-lang/rust-clippy/pull/6076)
+* [`or_fun_call`]: Revert changes addressing the handling of `const fn`
+ [#6077](https://github.com/rust-lang/rust-clippy/pull/6077)
+* [`needless_range_loop`]: No longer lints, when the iterable is used in the
+ range [#6102](https://github.com/rust-lang/rust-clippy/pull/6102)
+* [`inconsistent_digit_grouping`]: Fix bug when using floating point exponent
+ [#6104](https://github.com/rust-lang/rust-clippy/pull/6104)
+* [`mistyped_literal_suffixes`]: No longer lints on the fractional part of a
+ float (e.g. `713.32_64`)
+ [#6114](https://github.com/rust-lang/rust-clippy/pull/6114)
+* [`invalid_regex`]: No longer lint on unicode characters within `bytes::Regex`
+ [#6132](https://github.com/rust-lang/rust-clippy/pull/6132)
+* [`boxed_local`]: No longer lints on `extern fn` arguments
+ [#6133](https://github.com/rust-lang/rust-clippy/pull/6133)
+* [`needless_lifetimes`]: Fix regression, where lifetime is used in `where`
+ clause [#6198](https://github.com/rust-lang/rust-clippy/pull/6198)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_sort_by`]: Avoid dereferencing the suggested closure parameter
+ [#6078](https://github.com/rust-lang/rust-clippy/pull/6078)
+* [`needless_arbitrary_self_type`]: Correctly handle expanded code
+ [#6093](https://github.com/rust-lang/rust-clippy/pull/6093)
+* [`useless_format`]: Preserve raw strings in suggestion
+ [#6151](https://github.com/rust-lang/rust-clippy/pull/6151)
+* [`empty_loop`]: Suggest alternatives
+ [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`borrowed_box`]: Correctly add parentheses in suggestion
+ [#6200](https://github.com/rust-lang/rust-clippy/pull/6200)
+* [`unused_unit`]: Improve suggestion formatting
+ [#6247](https://github.com/rust-lang/rust-clippy/pull/6247)
+
+### Documentation Improvements
+
+* Some doc improvements:
+ * [`rc_buffer`] [#6090](https://github.com/rust-lang/rust-clippy/pull/6090)
+ * [`empty_loop`] [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`doc_markdown`]: Document problematic link text style
+ [#6107](https://github.com/rust-lang/rust-clippy/pull/6107)
+
+## Rust 1.48
+
+Released 2020-11-19
+
+[09bd400...e636b88](https://github.com/rust-lang/rust-clippy/compare/09bd400...e636b88)
+
+### New lints
+
+* [`self_assignment`] [#5894](https://github.com/rust-lang/rust-clippy/pull/5894)
+* [`unnecessary_lazy_evaluations`] [#5720](https://github.com/rust-lang/rust-clippy/pull/5720)
+* [`manual_strip`] [#6038](https://github.com/rust-lang/rust-clippy/pull/6038)
+* [`map_err_ignore`] [#5998](https://github.com/rust-lang/rust-clippy/pull/5998)
+* [`rc_buffer`] [#6044](https://github.com/rust-lang/rust-clippy/pull/6044)
+* `to_string_in_display` [#5831](https://github.com/rust-lang/rust-clippy/pull/5831)
+* `single_char_push_str` [#5881](https://github.com/rust-lang/rust-clippy/pull/5881)
+
+### Moves and Deprecations
+
+* Downgrade [`verbose_bit_mask`] to pedantic
+ [#6036](https://github.com/rust-lang/rust-clippy/pull/6036)
+
+### Enhancements
+
+* Extend [`precedence`] to handle chains of methods combined with unary negation
+ [#5928](https://github.com/rust-lang/rust-clippy/pull/5928)
+* [`useless_vec`]: add a configuration value for the maximum allowed size on the stack
+ [#5907](https://github.com/rust-lang/rust-clippy/pull/5907)
+* [`suspicious_arithmetic_impl`]: extend to implementations of `BitAnd`, `BitOr`, `BitXor`, `Rem`, `Shl`, and `Shr`
+ [#5884](https://github.com/rust-lang/rust-clippy/pull/5884)
+* `invalid_atomic_ordering`: detect misuse of `compare_exchange`, `compare_exchange_weak`, and `fetch_update`
+ [#6025](https://github.com/rust-lang/rust-clippy/pull/6025)
+* Avoid [`redundant_pattern_matching`] triggering in macros
+ [#6069](https://github.com/rust-lang/rust-clippy/pull/6069)
+* [`option_if_let_else`]: distinguish pure from impure `else` expressions
+ [#5937](https://github.com/rust-lang/rust-clippy/pull/5937)
+* [`needless_doctest_main`]: parse doctests instead of using textual search
+ [#5912](https://github.com/rust-lang/rust-clippy/pull/5912)
+* [`wildcard_imports`]: allow `prelude` to appear in any segment of an import
+ [#5929](https://github.com/rust-lang/rust-clippy/pull/5929)
+* Re-enable [`len_zero`] for ranges now that `range_is_empty` is stable
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+* [`option_as_ref_deref`]: catch fully-qualified calls to `Deref::deref` and `DerefMut::deref_mut`
+ [#5933](https://github.com/rust-lang/rust-clippy/pull/5933)
+
+### False Positive Fixes
+
+* [`useless_attribute`]: permit allowing [`wildcard_imports`] and [`enum_glob_use`]
+ [#5994](https://github.com/rust-lang/rust-clippy/pull/5994)
+* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts
+ [#5999](https://github.com/rust-lang/rust-clippy/pull/5999)
+* [`redundant_closure_call`]: take into account usages of the closure in nested functions and closures
+ [#5920](https://github.com/rust-lang/rust-clippy/pull/5920)
+* Fix false positive in [`borrow_interior_mutable_const`] when referencing a field behind a pointer
+ [#5949](https://github.com/rust-lang/rust-clippy/pull/5949)
+* [`doc_markdown`]: allow using "GraphQL" without backticks
+ [#5996](https://github.com/rust-lang/rust-clippy/pull/5996)
+* `to_string_in_display`: avoid linting when calling `to_string()` on anything that is not `self`
+ [#5971](https://github.com/rust-lang/rust-clippy/pull/5971)
+* [`indexing_slicing`] and [`out_of_bounds_indexing`] treat references to arrays as arrays
+ [#6034](https://github.com/rust-lang/rust-clippy/pull/6034)
+* [`should_implement_trait`]: ignore methods with lifetime parameters
+ [#5725](https://github.com/rust-lang/rust-clippy/pull/5725)
+* [`needless_return`]: avoid linting if a temporary borrows a local variable
+ [#5903](https://github.com/rust-lang/rust-clippy/pull/5903)
+* Restrict [`unnecessary_sort_by`] to non-reference, Copy types
+ [#6006](https://github.com/rust-lang/rust-clippy/pull/6006)
+* Avoid suggesting `from_bits`/`to_bits` in const contexts in [`transmute_int_to_float`]
+ [#5919](https://github.com/rust-lang/rust-clippy/pull/5919)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]: improve detection of interior mutable types
+ [#6046](https://github.com/rust-lang/rust-clippy/pull/6046)
+
+### Suggestion Fixes/Improvements
+
+* [`let_and_return`]: add a cast to the suggestion when the return expression has adjustments
+ [#5946](https://github.com/rust-lang/rust-clippy/pull/5946)
+* [`useless_conversion`]: show the type in the error message
+ [#6035](https://github.com/rust-lang/rust-clippy/pull/6035)
+* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message
+ [#5892](https://github.com/rust-lang/rust-clippy/pull/5892)
+* [`float_cmp`] and [`float_cmp_const`]: change wording to make margin of error less ambiguous
+ [#6043](https://github.com/rust-lang/rust-clippy/pull/6043)
+* [`default_trait_access`]: do not use unnecessary type parameters in the suggestion
+ [#5993](https://github.com/rust-lang/rust-clippy/pull/5993)
+* [`collapsible_if`]: don't use expanded code in the suggestion
+ [#5992](https://github.com/rust-lang/rust-clippy/pull/5992)
+* Do not suggest empty format strings in [`print_with_newline`] and [`write_with_newline`]
+ [#6042](https://github.com/rust-lang/rust-clippy/pull/6042)
+* [`unit_arg`]: improve the readability of the suggestion
+ [#5931](https://github.com/rust-lang/rust-clippy/pull/5931)
+* [`stable_sort_primitive`]: print the type that is being sorted in the lint message
+ [#5935](https://github.com/rust-lang/rust-clippy/pull/5935)
+* Show line count and max lines in [`too_many_lines`] lint message
+ [#6009](https://github.com/rust-lang/rust-clippy/pull/6009)
+* Keep parentheses in the suggestion of [`useless_conversion`] where applicable
+ [#5900](https://github.com/rust-lang/rust-clippy/pull/5900)
+* [`option_map_unit_fn`] and [`result_map_unit_fn`]: print the unit type `()` explicitly
+ [#6024](https://github.com/rust-lang/rust-clippy/pull/6024)
+* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>`
+ [#5899](https://github.com/rust-lang/rust-clippy/pull/5899)
+* Make lint messages adhere to rustc dev guide conventions
+ [#5893](https://github.com/rust-lang/rust-clippy/pull/5893)
+
+### ICE Fixes
+
+* Fix ICE in [`repeat_once`]
+ [#5948](https://github.com/rust-lang/rust-clippy/pull/5948)
+
+### Documentation Improvements
+
+* [`mutable_key_type`]: explain potential for false positives when the interior mutable type is not accessed in the `Hash` implementation
+ [#6019](https://github.com/rust-lang/rust-clippy/pull/6019)
+* [`unnecessary_mut_passed`]: fix typo
+ [#5913](https://github.com/rust-lang/rust-clippy/pull/5913)
+* Add example of false positive to [`ptr_arg`] docs.
+ [#5885](https://github.com/rust-lang/rust-clippy/pull/5885)
+* [`box_vec`](https://rust-lang.github.io/rust-clippy/master/index.html#box_collection), [`vec_box`] and [`borrowed_box`]: add link to the documentation of `Box`
+ [#6023](https://github.com/rust-lang/rust-clippy/pull/6023)
+
+## Rust 1.47
+
+Released 2020-10-08
+
+[c2c07fa...09bd400](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...09bd400)
+
+### New lints
+
+* [`derive_ord_xor_partial_ord`] [#5848](https://github.com/rust-lang/rust-clippy/pull/5848)
+* [`trait_duplication_in_bounds`] [#5852](https://github.com/rust-lang/rust-clippy/pull/5852)
+* [`map_identity`] [#5694](https://github.com/rust-lang/rust-clippy/pull/5694)
+* [`unit_return_expecting_ord`] [#5737](https://github.com/rust-lang/rust-clippy/pull/5737)
+* [`pattern_type_mismatch`] [#4841](https://github.com/rust-lang/rust-clippy/pull/4841)
+* [`repeat_once`] [#5773](https://github.com/rust-lang/rust-clippy/pull/5773)
+* [`same_item_push`] [#5825](https://github.com/rust-lang/rust-clippy/pull/5825)
+* [`needless_arbitrary_self_type`] [#5869](https://github.com/rust-lang/rust-clippy/pull/5869)
+* [`match_like_matches_macro`] [#5769](https://github.com/rust-lang/rust-clippy/pull/5769)
+* [`stable_sort_primitive`] [#5809](https://github.com/rust-lang/rust-clippy/pull/5809)
+* [`blanket_clippy_restriction_lints`] [#5750](https://github.com/rust-lang/rust-clippy/pull/5750)
+* [`option_if_let_else`] [#5301](https://github.com/rust-lang/rust-clippy/pull/5301)
+
+### Moves and Deprecations
+
+* Deprecate [`regex_macro`] lint
+ [#5760](https://github.com/rust-lang/rust-clippy/pull/5760)
+* Move [`range_minus_one`] to `pedantic`
+ [#5752](https://github.com/rust-lang/rust-clippy/pull/5752)
+
+### Enhancements
+
+* Improve [`needless_collect`] by catching `collect` calls followed by `iter` or `into_iter` calls
+ [#5837](https://github.com/rust-lang/rust-clippy/pull/5837)
+* [`panic`], [`todo`], [`unimplemented`] and [`unreachable`] now detect calls with formatting
+ [#5811](https://github.com/rust-lang/rust-clippy/pull/5811)
+* Detect more cases of [`suboptimal_flops`] and [`imprecise_flops`]
+ [#5443](https://github.com/rust-lang/rust-clippy/pull/5443)
+* Handle asymmetrical implementations of `PartialEq` in [`cmp_owned`]
+ [#5701](https://github.com/rust-lang/rust-clippy/pull/5701)
+* Make it possible to allow [`unsafe_derive_deserialize`]
+ [#5870](https://github.com/rust-lang/rust-clippy/pull/5870)
+* Catch `ord.min(a).max(b)` where a < b in [`min_max`]
+ [#5871](https://github.com/rust-lang/rust-clippy/pull/5871)
+* Make [`clone_on_copy`] suggestion machine applicable
+ [#5745](https://github.com/rust-lang/rust-clippy/pull/5745)
+* Enable [`len_zero`] on ranges now that `is_empty` is stable on them
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+
+### False Positive Fixes
+
+* Avoid triggering [`or_fun_call`] with const fns that take no arguments
+ [#5889](https://github.com/rust-lang/rust-clippy/pull/5889)
+* Fix [`redundant_closure_call`] false positive for closures that have multiple calls
+ [#5800](https://github.com/rust-lang/rust-clippy/pull/5800)
+* Don't lint cases involving `ManuallyDrop` in [`redundant_clone`]
+ [#5824](https://github.com/rust-lang/rust-clippy/pull/5824)
+* Treat a single expression the same as a single statement in the 2nd arm of a match in [`single_match_else`]
+ [#5771](https://github.com/rust-lang/rust-clippy/pull/5771)
+* Don't trigger [`unnested_or_patterns`] if the feature `or_patterns` is not enabled
+ [#5758](https://github.com/rust-lang/rust-clippy/pull/5758)
+* Avoid linting if key borrows in [`unnecessary_sort_by`]
+ [#5756](https://github.com/rust-lang/rust-clippy/pull/5756)
+* Consider `Try` impl for `Poll` when generating suggestions in [`try_err`]
+ [#5857](https://github.com/rust-lang/rust-clippy/pull/5857)
+* Take input lifetimes into account in `manual_async_fn`
+ [#5859](https://github.com/rust-lang/rust-clippy/pull/5859)
+* Fix multiple false positives in [`type_repetition_in_bounds`] and add a configuration option
+ [#5761](https://github.com/rust-lang/rust-clippy/pull/5761)
+* Limit the [`suspicious_arithmetic_impl`] lint to one binary operation
+ [#5820](https://github.com/rust-lang/rust-clippy/pull/5820)
+
+### Suggestion Fixes/Improvements
+
+* Improve readability of [`shadow_unrelated`] suggestion by truncating the RHS snippet
+ [#5788](https://github.com/rust-lang/rust-clippy/pull/5788)
+* Suggest `filter_map` instead of `flat_map` when mapping to `Option` in [`map_flatten`]
+ [#5846](https://github.com/rust-lang/rust-clippy/pull/5846)
+* Ensure suggestion is shown correctly for long method call chains in [`iter_nth_zero`]
+ [#5793](https://github.com/rust-lang/rust-clippy/pull/5793)
+* Drop borrow operator in suggestions of [`redundant_pattern_matching`]
+ [#5815](https://github.com/rust-lang/rust-clippy/pull/5815)
+* Add suggestion for [`iter_skip_next`]
+ [#5843](https://github.com/rust-lang/rust-clippy/pull/5843)
+* Improve [`collapsible_if`] fix suggestion
+ [#5732](https://github.com/rust-lang/rust-clippy/pull/5732)
+
+### ICE Fixes
+
+* Fix ICE caused by [`needless_collect`]
+ [#5877](https://github.com/rust-lang/rust-clippy/pull/5877)
+* Fix ICE caused by [`unnested_or_patterns`]
+ [#5784](https://github.com/rust-lang/rust-clippy/pull/5784)
+
+### Documentation Improvements
+
+* Fix grammar of [`await_holding_lock`] documentation
+ [#5748](https://github.com/rust-lang/rust-clippy/pull/5748)
+
+### Others
+
+* Make lints adhere to the rustc dev guide
+ [#5888](https://github.com/rust-lang/rust-clippy/pull/5888)
+
+## Rust 1.46
+
+Released 2020-08-27
+
+[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...c2c07fa)
+
+### New lints
+
+* [`unnested_or_patterns`] [#5378](https://github.com/rust-lang/rust-clippy/pull/5378)
+* [`iter_next_slice`] [#5597](https://github.com/rust-lang/rust-clippy/pull/5597)
+* [`unnecessary_sort_by`] [#5623](https://github.com/rust-lang/rust-clippy/pull/5623)
+* [`vec_resize_to_zero`] [#5637](https://github.com/rust-lang/rust-clippy/pull/5637)
+
+### Moves and Deprecations
+
+* Move [`cast_ptr_alignment`] to pedantic [#5667](https://github.com/rust-lang/rust-clippy/pull/5667)
+
+### Enhancements
+
+* Improve [`mem_replace_with_uninit`] lint [#5695](https://github.com/rust-lang/rust-clippy/pull/5695)
+
+### False Positive Fixes
+
+* [`len_zero`]: Avoid linting ranges when the `range_is_empty` feature is not enabled
+ [#5656](https://github.com/rust-lang/rust-clippy/pull/5656)
+* [`let_and_return`]: Don't lint if a temporary borrow is involved
+ [#5680](https://github.com/rust-lang/rust-clippy/pull/5680)
+* [`reversed_empty_ranges`]: Avoid linting `N..N` in for loop arguments in
+ [#5692](https://github.com/rust-lang/rust-clippy/pull/5692)
+* [`if_same_then_else`]: Don't assume multiplication is always commutative
+ [#5702](https://github.com/rust-lang/rust-clippy/pull/5702)
+* [`disallowed_names`]: Remove `bar` from the default configuration
+ [#5712](https://github.com/rust-lang/rust-clippy/pull/5712)
+* [`redundant_pattern_matching`]: Avoid suggesting non-`const fn` calls in const contexts
+ [#5724](https://github.com/rust-lang/rust-clippy/pull/5724)
+
+### Suggestion Fixes/Improvements
+
+* Fix suggestion of [`unit_arg`] lint, so that it suggest semantic equivalent code
+ [#4455](https://github.com/rust-lang/rust-clippy/pull/4455)
+* Add auto applicable suggestion to [`macro_use_imports`]
+ [#5279](https://github.com/rust-lang/rust-clippy/pull/5279)
+
+### ICE Fixes
+
+* Fix ICE in the `consts` module of Clippy [#5709](https://github.com/rust-lang/rust-clippy/pull/5709)
+
+### Documentation Improvements
+
+* Improve code examples across multiple lints [#5664](https://github.com/rust-lang/rust-clippy/pull/5664)
+
+### Others
+
+* Introduce a `--rustc` flag to `clippy-driver`, which turns `clippy-driver`
+ into `rustc` and passes all the given arguments to `rustc`. This is especially
+ useful for tools that need the `rustc` version Clippy was compiled with,
+ instead of the Clippy version. E.g. `clippy-driver --rustc --version` will
+ print the output of `rustc --version`.
+ [#5178](https://github.com/rust-lang/rust-clippy/pull/5178)
+* New issue templates now make it easier to complain if Clippy is too annoying
+ or not annoying enough! [#5735](https://github.com/rust-lang/rust-clippy/pull/5735)
+
+## Rust 1.45
+
+Released 2020-07-16
+
+[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)
+
+### New lints
+
+* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
+* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
+* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
+* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
+* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
+* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
+* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
+* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
+* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)
+
+### Moves and Deprecations
+
+* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
+* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
+* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
+* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
+* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
+* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+
+### Enhancements
+
+* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
+* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
+* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
+* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)
+
+### False Positive Fixes
+
+* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
+* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
+* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
+* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
+* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
+* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
+* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
+* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
+* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
+* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
+* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
+* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
+and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
+* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)
+
+### Suggestion Improvements
+
+* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
+* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
+* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
+* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)
+
+### ICE Fixes
+
+* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
+* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)
+
+### Documentation
+
+* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
+* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)
+
+## Rust 1.44
+
+Released 2020-06-04
+
+[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)
+
+### New lints
+
+* [`explicit_deref_methods`] [#5226](https://github.com/rust-lang/rust-clippy/pull/5226)
+* [`implicit_saturating_sub`] [#5427](https://github.com/rust-lang/rust-clippy/pull/5427)
+* [`macro_use_imports`] [#5230](https://github.com/rust-lang/rust-clippy/pull/5230)
+* [`verbose_file_reads`] [#5272](https://github.com/rust-lang/rust-clippy/pull/5272)
+* [`future_not_send`] [#5423](https://github.com/rust-lang/rust-clippy/pull/5423)
+* [`redundant_pub_crate`] [#5319](https://github.com/rust-lang/rust-clippy/pull/5319)
+* [`large_const_arrays`] [#5248](https://github.com/rust-lang/rust-clippy/pull/5248)
+* [`result_map_or_into_option`] [#5415](https://github.com/rust-lang/rust-clippy/pull/5415)
+* [`redundant_allocation`] [#5349](https://github.com/rust-lang/rust-clippy/pull/5349)
+* [`fn_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+* [`vtable_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+
+
+### Moves and Deprecations
+
+* Deprecate [`replace_consts`] lint [#5380](https://github.com/rust-lang/rust-clippy/pull/5380)
+* Move [`cognitive_complexity`] to nursery [#5428](https://github.com/rust-lang/rust-clippy/pull/5428)
+* Move [`useless_transmute`] to nursery [#5364](https://github.com/rust-lang/rust-clippy/pull/5364)
+* Downgrade [`inefficient_to_string`] to pedantic [#5412](https://github.com/rust-lang/rust-clippy/pull/5412)
+* Downgrade [`option_option`] to pedantic [#5401](https://github.com/rust-lang/rust-clippy/pull/5401)
+* Downgrade [`unreadable_literal`] to pedantic [#5419](https://github.com/rust-lang/rust-clippy/pull/5419)
+* Downgrade [`let_unit_value`] to pedantic [#5409](https://github.com/rust-lang/rust-clippy/pull/5409)
+* Downgrade [`trivially_copy_pass_by_ref`] to pedantic [#5410](https://github.com/rust-lang/rust-clippy/pull/5410)
+* Downgrade [`implicit_hasher`] to pedantic [#5411](https://github.com/rust-lang/rust-clippy/pull/5411)
+
+### Enhancements
+
+* On _nightly_ you can now use `cargo clippy --fix -Z unstable-options` to
+ auto-fix lints that support this [#5363](https://github.com/rust-lang/rust-clippy/pull/5363)
+* Make [`redundant_clone`] also trigger on cases where the cloned value is not
+ consumed. [#5304](https://github.com/rust-lang/rust-clippy/pull/5304)
+* Expand [`integer_arithmetic`] to also disallow bit-shifting [#5430](https://github.com/rust-lang/rust-clippy/pull/5430)
+* [`option_as_ref_deref`] now detects more deref cases [#5425](https://github.com/rust-lang/rust-clippy/pull/5425)
+* [`large_enum_variant`] now report the sizes of the largest and second-largest variants [#5466](https://github.com/rust-lang/rust-clippy/pull/5466)
+* [`bool_comparison`] now also checks for inequality comparisons that can be
+ written more concisely [#5365](https://github.com/rust-lang/rust-clippy/pull/5365)
+* Expand [`clone_on_copy`] to work in method call arguments as well [#5441](https://github.com/rust-lang/rust-clippy/pull/5441)
+* [`redundant_pattern_matching`] now also handles `while let` [#5483](https://github.com/rust-lang/rust-clippy/pull/5483)
+* [`integer_arithmetic`] now also lints references of integers [#5329](https://github.com/rust-lang/rust-clippy/pull/5329)
+* Expand [`float_cmp_const`] to also work on arrays [#5345](https://github.com/rust-lang/rust-clippy/pull/5345)
+* Trigger [`map_flatten`] when map is called on an `Option` [#5473](https://github.com/rust-lang/rust-clippy/pull/5473)
+
+### False Positive Fixes
+
+* [`many_single_char_names`] [#5468](https://github.com/rust-lang/rust-clippy/pull/5468)
+* [`should_implement_trait`] [#5437](https://github.com/rust-lang/rust-clippy/pull/5437)
+* [`unused_self`] [#5387](https://github.com/rust-lang/rust-clippy/pull/5387)
+* [`redundant_clone`] [#5453](https://github.com/rust-lang/rust-clippy/pull/5453)
+* [`precedence`] [#5445](https://github.com/rust-lang/rust-clippy/pull/5445)
+* [`suspicious_op_assign_impl`] [#5424](https://github.com/rust-lang/rust-clippy/pull/5424)
+* [`needless_lifetimes`] [#5293](https://github.com/rust-lang/rust-clippy/pull/5293)
+* [`redundant_pattern`] [#5287](https://github.com/rust-lang/rust-clippy/pull/5287)
+* [`inconsistent_digit_grouping`] [#5451](https://github.com/rust-lang/rust-clippy/pull/5451)
+
+
+### Suggestion Improvements
+
+* Improved [`question_mark`] lint suggestion so that it doesn't add redundant `as_ref()` [#5481](https://github.com/rust-lang/rust-clippy/pull/5481)
+* Improve the suggested placeholder in [`option_map_unit_fn`] [#5292](https://github.com/rust-lang/rust-clippy/pull/5292)
+* Improve suggestion for [`match_single_binding`] when triggered inside a closure [#5350](https://github.com/rust-lang/rust-clippy/pull/5350)
+
+### ICE Fixes
+
+* Handle the unstable `trivial_bounds` feature [#5296](https://github.com/rust-lang/rust-clippy/pull/5296)
+* `shadow_*` lints [#5297](https://github.com/rust-lang/rust-clippy/pull/5297)
+
+### Documentation
+
+* Fix documentation generation for configurable lints [#5353](https://github.com/rust-lang/rust-clippy/pull/5353)
+* Update documentation for [`new_ret_no_self`] [#5448](https://github.com/rust-lang/rust-clippy/pull/5448)
+* The documentation for [`option_option`] now suggest using a tri-state enum [#5403](https://github.com/rust-lang/rust-clippy/pull/5403)
+* Fix bit mask example in [`verbose_bit_mask`] documentation [#5454](https://github.com/rust-lang/rust-clippy/pull/5454)
+* [`wildcard_imports`] documentation now mentions that `use ...::prelude::*` is
+ not linted [#5312](https://github.com/rust-lang/rust-clippy/pull/5312)
+
+## Rust 1.43
+
+Released 2020-04-23
+
+[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)
+
+### New lints
+
+* [`imprecise_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`suboptimal_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`wildcard_imports`] [#5029](https://github.com/rust-lang/rust-clippy/pull/5029)
+* [`single_component_path_imports`] [#5058](https://github.com/rust-lang/rust-clippy/pull/5058)
+* [`match_single_binding`] [#5061](https://github.com/rust-lang/rust-clippy/pull/5061)
+* [`let_underscore_lock`] [#5101](https://github.com/rust-lang/rust-clippy/pull/5101)
+* [`struct_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`fn_params_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`option_env_unwrap`] [#5148](https://github.com/rust-lang/rust-clippy/pull/5148)
+* [`lossy_float_literal`] [#5202](https://github.com/rust-lang/rust-clippy/pull/5202)
+* [`rest_pat_in_fully_bound_structs`] [#5258](https://github.com/rust-lang/rust-clippy/pull/5258)
+
+### Moves and Deprecations
+
+* Move [`unneeded_field_pattern`] to pedantic group [#5200](https://github.com/rust-lang/rust-clippy/pull/5200)
+
+### Enhancements
+
+* Make [`missing_errors_doc`] lint also trigger on `async` functions
+ [#5181](https://github.com/rust-lang/rust-clippy/pull/5181)
+* Add more constants to [`approx_constant`] [#5193](https://github.com/rust-lang/rust-clippy/pull/5193)
+* Extend [`question_mark`] lint [#5266](https://github.com/rust-lang/rust-clippy/pull/5266)
+
+### False Positive Fixes
+
+* [`use_debug`] [#5047](https://github.com/rust-lang/rust-clippy/pull/5047)
+* [`unnecessary_unwrap`] [#5132](https://github.com/rust-lang/rust-clippy/pull/5132)
+* [`zero_prefixed_literal`] [#5170](https://github.com/rust-lang/rust-clippy/pull/5170)
+* [`missing_const_for_fn`] [#5216](https://github.com/rust-lang/rust-clippy/pull/5216)
+
+### Suggestion Improvements
+
+* Improve suggestion when blocks of code are suggested [#5134](https://github.com/rust-lang/rust-clippy/pull/5134)
+
+### ICE Fixes
+
+* `misc_early` lints [#5129](https://github.com/rust-lang/rust-clippy/pull/5129)
+* [`missing_errors_doc`] [#5213](https://github.com/rust-lang/rust-clippy/pull/5213)
+* Fix ICE when evaluating `usize`s [#5256](https://github.com/rust-lang/rust-clippy/pull/5256)
+
+### Documentation
+
+* Improve documentation of [`iter_nth_zero`]
+* Add documentation pages for stable releases [#5171](https://github.com/rust-lang/rust-clippy/pull/5171)
+
+### Others
+
+* Clippy now completely runs on GitHub Actions [#5190](https://github.com/rust-lang/rust-clippy/pull/5190)
+
+
+## Rust 1.42
+
+Released 2020-03-12
+
+[69f99e7...4ee1206](https://github.com/rust-lang/rust-clippy/compare/69f99e7...4ee1206)
+
+### New lints
+
+* [`filetype_is_file`] [#4543](https://github.com/rust-lang/rust-clippy/pull/4543)
+* [`let_underscore_must_use`] [#4823](https://github.com/rust-lang/rust-clippy/pull/4823)
+* [`modulo_arithmetic`] [#4867](https://github.com/rust-lang/rust-clippy/pull/4867)
+* [`mem_replace_with_default`] [#4881](https://github.com/rust-lang/rust-clippy/pull/4881)
+* [`mutable_key_type`] [#4885](https://github.com/rust-lang/rust-clippy/pull/4885)
+* [`option_as_ref_deref`] [#4945](https://github.com/rust-lang/rust-clippy/pull/4945)
+* [`wildcard_in_or_patterns`] [#4960](https://github.com/rust-lang/rust-clippy/pull/4960)
+* [`iter_nth_zero`] [#4966](https://github.com/rust-lang/rust-clippy/pull/4966)
+* `invalid_atomic_ordering` [#4999](https://github.com/rust-lang/rust-clippy/pull/4999)
+* [`skip_while_next`] [#5067](https://github.com/rust-lang/rust-clippy/pull/5067)
+
+### Moves and Deprecations
+
+* Move [`transmute_float_to_int`] from nursery to complexity group
+ [#5015](https://github.com/rust-lang/rust-clippy/pull/5015)
+* Move [`range_plus_one`] to pedantic group [#5057](https://github.com/rust-lang/rust-clippy/pull/5057)
+* Move [`debug_assert_with_mut_call`] to nursery group [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Deprecate `unused_label` [#4930](https://github.com/rust-lang/rust-clippy/pull/4930)
+
+### Enhancements
+
+* Lint vectored IO in [`unused_io_amount`] [#5027](https://github.com/rust-lang/rust-clippy/pull/5027)
+* Make [`vec_box`] configurable by adding a size threshold [#5081](https://github.com/rust-lang/rust-clippy/pull/5081)
+* Also lint constants in [`cmp_nan`] [#4910](https://github.com/rust-lang/rust-clippy/pull/4910)
+* Fix false negative in [`expect_fun_call`] [#4915](https://github.com/rust-lang/rust-clippy/pull/4915)
+* Fix false negative in [`redundant_clone`] [#5017](https://github.com/rust-lang/rust-clippy/pull/5017)
+
+### False Positive Fixes
+
+* [`map_clone`] [#4937](https://github.com/rust-lang/rust-clippy/pull/4937)
+* [`replace_consts`] [#4977](https://github.com/rust-lang/rust-clippy/pull/4977)
+* [`let_and_return`] [#5008](https://github.com/rust-lang/rust-clippy/pull/5008)
+* [`eq_op`] [#5079](https://github.com/rust-lang/rust-clippy/pull/5079)
+* [`possible_missing_comma`] [#5083](https://github.com/rust-lang/rust-clippy/pull/5083)
+* [`debug_assert_with_mut_call`] [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Don't trigger [`let_underscore_must_use`] in external macros
+ [#5082](https://github.com/rust-lang/rust-clippy/pull/5082)
+* Don't trigger [`empty_loop`] in `no_std` crates [#5086](https://github.com/rust-lang/rust-clippy/pull/5086)
+
+### Suggestion Improvements
+
+* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634)
+* [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934)
+* [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935)
+* [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956)
+* `unknown_clippy_lints` [#4963](https://github.com/rust-lang/rust-clippy/pull/4963)
+* [`explicit_into_iter_loop`] [#4978](https://github.com/rust-lang/rust-clippy/pull/4978)
+* [`useless_attribute`] [#5022](https://github.com/rust-lang/rust-clippy/pull/5022)
+* `if_let_some_result` [#5032](https://github.com/rust-lang/rust-clippy/pull/5032)
+
+### ICE fixes
+
+* [`unsound_collection_transmute`] [#4975](https://github.com/rust-lang/rust-clippy/pull/4975)
+
+### Documentation
+
+* Improve documentation of [`empty_enum`], [`replace_consts`], [`redundant_clone`], and [`iterator_step_by_zero`]
+
+
+## Rust 1.41
+
+Released 2020-01-30
+
+[c8e3cfb...69f99e7](https://github.com/rust-lang/rust-clippy/compare/c8e3cfb...69f99e7)
+
+* New Lints:
+ * [`exit`] [#4697](https://github.com/rust-lang/rust-clippy/pull/4697)
+ * [`to_digit_is_some`] [#4801](https://github.com/rust-lang/rust-clippy/pull/4801)
+ * [`tabs_in_doc_comments`] [#4806](https://github.com/rust-lang/rust-clippy/pull/4806)
+ * [`large_stack_arrays`] [#4807](https://github.com/rust-lang/rust-clippy/pull/4807)
+ * [`same_functions_in_if_condition`] [#4814](https://github.com/rust-lang/rust-clippy/pull/4814)
+ * [`zst_offset`] [#4816](https://github.com/rust-lang/rust-clippy/pull/4816)
+ * [`as_conversions`] [#4821](https://github.com/rust-lang/rust-clippy/pull/4821)
+ * [`missing_errors_doc`] [#4884](https://github.com/rust-lang/rust-clippy/pull/4884)
+ * [`transmute_float_to_int`] [#4889](https://github.com/rust-lang/rust-clippy/pull/4889)
+* Remove plugin interface, see
+ [Inside Rust Blog](https://blog.rust-lang.org/inside-rust/2019/11/04/Clippy-removes-plugin-interface.html) for
+ details [#4714](https://github.com/rust-lang/rust-clippy/pull/4714)
+* Move [`use_self`] to nursery group [#4863](https://github.com/rust-lang/rust-clippy/pull/4863)
+* Deprecate `into_iter_on_array` [#4788](https://github.com/rust-lang/rust-clippy/pull/4788)
+* Expand [`string_lit_as_bytes`] to also trigger when literal has escapes
+ [#4808](https://github.com/rust-lang/rust-clippy/pull/4808)
+* Fix false positive in `comparison_chain` [#4842](https://github.com/rust-lang/rust-clippy/pull/4842)
+* Fix false positive in `while_immutable_condition` [#4730](https://github.com/rust-lang/rust-clippy/pull/4730)
+* Fix false positive in `explicit_counter_loop` [#4803](https://github.com/rust-lang/rust-clippy/pull/4803)
+* Fix false positive in `must_use_candidate` [#4794](https://github.com/rust-lang/rust-clippy/pull/4794)
+* Fix false positive in `print_with_newline` and `write_with_newline`
+ [#4769](https://github.com/rust-lang/rust-clippy/pull/4769)
+* Fix false positive in `derive_hash_xor_eq` [#4766](https://github.com/rust-lang/rust-clippy/pull/4766)
+* Fix false positive in `missing_inline_in_public_items` [#4870](https://github.com/rust-lang/rust-clippy/pull/4870)
+* Fix false positive in `string_add` [#4880](https://github.com/rust-lang/rust-clippy/pull/4880)
+* Fix false positive in `float_arithmetic` [#4851](https://github.com/rust-lang/rust-clippy/pull/4851)
+* Fix false positive in `cast_sign_loss` [#4883](https://github.com/rust-lang/rust-clippy/pull/4883)
+* Fix false positive in `manual_swap` [#4877](https://github.com/rust-lang/rust-clippy/pull/4877)
+* Fix ICEs occurring while checking some block expressions [#4772](https://github.com/rust-lang/rust-clippy/pull/4772)
+* Fix ICE in `use_self` [#4776](https://github.com/rust-lang/rust-clippy/pull/4776)
+* Fix ICEs related to `const_generics` [#4780](https://github.com/rust-lang/rust-clippy/pull/4780)
+* Display help when running `clippy-driver` without arguments, instead of ICEing
+ [#4810](https://github.com/rust-lang/rust-clippy/pull/4810)
+* Clippy has its own ICE message now [#4588](https://github.com/rust-lang/rust-clippy/pull/4588)
+* Show deprecated lints in the documentation again [#4757](https://github.com/rust-lang/rust-clippy/pull/4757)
+* Improve Documentation by adding positive examples to some lints
+ [#4832](https://github.com/rust-lang/rust-clippy/pull/4832)
+
+## Rust 1.40
+
+Released 2019-12-19
+
+[4e7e71b...c8e3cfb](https://github.com/rust-lang/rust-clippy/compare/4e7e71b...c8e3cfb)
+
+* New Lints:
+ * [`unneeded_wildcard_pattern`] [#4537](https://github.com/rust-lang/rust-clippy/pull/4537)
+ * [`needless_doctest_main`] [#4603](https://github.com/rust-lang/rust-clippy/pull/4603)
+ * [`suspicious_unary_op_formatting`] [#4615](https://github.com/rust-lang/rust-clippy/pull/4615)
+ * [`debug_assert_with_mut_call`] [#4680](https://github.com/rust-lang/rust-clippy/pull/4680)
+ * [`unused_self`] [#4619](https://github.com/rust-lang/rust-clippy/pull/4619)
+ * [`inefficient_to_string`] [#4683](https://github.com/rust-lang/rust-clippy/pull/4683)
+ * [`must_use_unit`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`must_use_candidate`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`double_must_use`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`comparison_chain`] [#4569](https://github.com/rust-lang/rust-clippy/pull/4569)
+ * [`unsound_collection_transmute`] [#4592](https://github.com/rust-lang/rust-clippy/pull/4592)
+ * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+* Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736)
+* Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613)
+* Expand `integer_arithmetic` to also detect mutating arithmetic like `+=` [#4585](https://github.com/rust-lang/rust-clippy/pull/4585)
+* Fix false positive in `nonminimal_bool` [#4568](https://github.com/rust-lang/rust-clippy/pull/4568)
+* Fix false positive in `missing_safety_doc` [#4611](https://github.com/rust-lang/rust-clippy/pull/4611)
+* Fix false positive in `cast_sign_loss` [#4614](https://github.com/rust-lang/rust-clippy/pull/4614)
+* Fix false positive in `redundant_clone` [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Fix false positive in `try_err` [#4721](https://github.com/rust-lang/rust-clippy/pull/4721)
+* Fix false positive in `toplevel_ref_arg` [#4570](https://github.com/rust-lang/rust-clippy/pull/4570)
+* Fix false positive in `multiple_inherent_impl` [#4593](https://github.com/rust-lang/rust-clippy/pull/4593)
+* Improve more suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4575](https://github.com/rust-lang/rust-clippy/pull/4575)
+* Improve suggestion for `zero_ptr` [#4599](https://github.com/rust-lang/rust-clippy/pull/4599)
+* Improve suggestion for `explicit_counter_loop` [#4691](https://github.com/rust-lang/rust-clippy/pull/4691)
+* Improve suggestion for `mul_add` [#4602](https://github.com/rust-lang/rust-clippy/pull/4602)
+* Improve suggestion for `assertions_on_constants` [#4635](https://github.com/rust-lang/rust-clippy/pull/4635)
+* Fix ICE in `use_self` [#4671](https://github.com/rust-lang/rust-clippy/pull/4671)
+* Fix ICE when encountering const casts [#4590](https://github.com/rust-lang/rust-clippy/pull/4590)
+
+## Rust 1.39
+
+Released 2019-11-07
+
+[3aea860...4e7e71b](https://github.com/rust-lang/rust-clippy/compare/3aea860...4e7e71b)
+
+* New Lints:
+ * [`uninit_assumed_init`] [#4479](https://github.com/rust-lang/rust-clippy/pull/4479)
+ * [`flat_map_identity`] [#4231](https://github.com/rust-lang/rust-clippy/pull/4231)
+ * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
+ * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
+ * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
+ * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
+ * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
+* Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
+* Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
+* Move `cast_lossless` to pedantic group [#4539](https://github.com/rust-lang/rust-clippy/pull/4539)
+* `temporary_cstring_as_ptr` now catches more cases [#4425](https://github.com/rust-lang/rust-clippy/pull/4425)
+* `use_self` now works in constructors, too [#4525](https://github.com/rust-lang/rust-clippy/pull/4525)
+* `cargo_common_metadata` now checks for license files [#4518](https://github.com/rust-lang/rust-clippy/pull/4518)
+* `cognitive_complexity` now includes the measured complexity in the warning message [#4469](https://github.com/rust-lang/rust-clippy/pull/4469)
+* Fix false positives in `block_in_if_*` lints [#4458](https://github.com/rust-lang/rust-clippy/pull/4458)
+* Fix false positive in `cast_lossless` [#4473](https://github.com/rust-lang/rust-clippy/pull/4473)
+* Fix false positive in `clone_on_copy` [#4411](https://github.com/rust-lang/rust-clippy/pull/4411)
+* Fix false positive in `deref_addrof` [#4487](https://github.com/rust-lang/rust-clippy/pull/4487)
+* Fix false positive in `too_many_lines` [#4490](https://github.com/rust-lang/rust-clippy/pull/4490)
+* Fix false positive in `new_ret_no_self` [#4365](https://github.com/rust-lang/rust-clippy/pull/4365)
+* Fix false positive in `manual_swap` [#4478](https://github.com/rust-lang/rust-clippy/pull/4478)
+* Fix false positive in `missing_const_for_fn` [#4450](https://github.com/rust-lang/rust-clippy/pull/4450)
+* Fix false positive in `extra_unused_lifetimes` [#4477](https://github.com/rust-lang/rust-clippy/pull/4477)
+* Fix false positive in `inherent_to_string` [#4460](https://github.com/rust-lang/rust-clippy/pull/4460)
+* Fix false positive in `map_entry` [#4495](https://github.com/rust-lang/rust-clippy/pull/4495)
+* Fix false positive in `unused_unit` [#4445](https://github.com/rust-lang/rust-clippy/pull/4445)
+* Fix false positive in `redundant_pattern` [#4489](https://github.com/rust-lang/rust-clippy/pull/4489)
+* Fix false positive in `wrong_self_convention` [#4369](https://github.com/rust-lang/rust-clippy/pull/4369)
+* Improve various suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4558](https://github.com/rust-lang/rust-clippy/pull/4558)
+* Improve suggestions for `redundant_pattern_matching` [#4352](https://github.com/rust-lang/rust-clippy/pull/4352)
+* Improve suggestions for `explicit_write` [#4544](https://github.com/rust-lang/rust-clippy/pull/4544)
+* Improve suggestion for `or_fun_call` [#4522](https://github.com/rust-lang/rust-clippy/pull/4522)
+* Improve suggestion for `match_as_ref` [#4446](https://github.com/rust-lang/rust-clippy/pull/4446)
+* Improve suggestion for `unnecessary_fold_span` [#4382](https://github.com/rust-lang/rust-clippy/pull/4382)
+* Add suggestions for `unseparated_literal_suffix` [#4401](https://github.com/rust-lang/rust-clippy/pull/4401)
+* Add suggestions for `char_lit_as_u8` [#4418](https://github.com/rust-lang/rust-clippy/pull/4418)
+
+## Rust 1.38
+
+Released 2019-09-26
+
+[e3cb40e...3aea860](https://github.com/rust-lang/rust-clippy/compare/e3cb40e...3aea860)
+
+* New Lints:
+ * [`main_recursion`] [#4203](https://github.com/rust-lang/rust-clippy/pull/4203)
+ * [`inherent_to_string`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`inherent_to_string_shadow_display`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`type_repetition_in_bounds`] [#3766](https://github.com/rust-lang/rust-clippy/pull/3766)
+ * [`try_err`] [#4222](https://github.com/rust-lang/rust-clippy/pull/4222)
+* Move `{unnecessary,panicking}_unwrap` out of nursery [#4307](https://github.com/rust-lang/rust-clippy/pull/4307)
+* Extend the `use_self` lint to suggest uses of `Self::Variant` [#4308](https://github.com/rust-lang/rust-clippy/pull/4308)
+* Improve suggestion for needless return [#4262](https://github.com/rust-lang/rust-clippy/pull/4262)
+* Add auto-fixable suggestion for `let_unit` [#4337](https://github.com/rust-lang/rust-clippy/pull/4337)
+* Fix false positive in `pub_enum_variant_names` and `enum_variant_names` [#4345](https://github.com/rust-lang/rust-clippy/pull/4345)
+* Fix false positive in `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Fix false positive in `string_lit_as_bytes` [#4233](https://github.com/rust-lang/rust-clippy/pull/4233)
+* Fix false positive in `needless_lifetimes` [#4266](https://github.com/rust-lang/rust-clippy/pull/4266)
+* Fix false positive in `float_cmp` [#4275](https://github.com/rust-lang/rust-clippy/pull/4275)
+* Fix false positives in `needless_return` [#4274](https://github.com/rust-lang/rust-clippy/pull/4274)
+* Fix false negative in `match_same_arms` [#4246](https://github.com/rust-lang/rust-clippy/pull/4246)
+* Fix incorrect suggestion for `needless_bool` [#4335](https://github.com/rust-lang/rust-clippy/pull/4335)
+* Improve suggestion for `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Improve suggestion for `single_char_literal` [#4361](https://github.com/rust-lang/rust-clippy/pull/4361)
+* Improve suggestion for `len_zero` [#4314](https://github.com/rust-lang/rust-clippy/pull/4314)
+* Fix ICE in `implicit_hasher` [#4268](https://github.com/rust-lang/rust-clippy/pull/4268)
+* Fix allow bug in `trivially_copy_pass_by_ref` [#4250](https://github.com/rust-lang/rust-clippy/pull/4250)
+
+## Rust 1.37
+
+Released 2019-08-15
+
+[082cfa7...e3cb40e](https://github.com/rust-lang/rust-clippy/compare/082cfa7...e3cb40e)
+
+* New Lints:
+ * [`checked_conversions`] [#4088](https://github.com/rust-lang/rust-clippy/pull/4088)
+ * [`get_last_with_len`] [#3832](https://github.com/rust-lang/rust-clippy/pull/3832)
+ * [`integer_division`] [#4195](https://github.com/rust-lang/rust-clippy/pull/4195)
+* Renamed Lint: `const_static_lifetime` is now called [`redundant_static_lifetimes`].
+ The lint now covers statics in addition to consts [#4162](https://github.com/rust-lang/rust-clippy/pull/4162)
+* [`match_same_arms`] now warns for all identical arms, instead of only the first one [#4102](https://github.com/rust-lang/rust-clippy/pull/4102)
+* [`needless_return`] now works with void functions [#4220](https://github.com/rust-lang/rust-clippy/pull/4220)
+* Fix false positive in [`redundant_closure`] [#4190](https://github.com/rust-lang/rust-clippy/pull/4190)
+* Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107)
+* Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214)
+* Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136)
+* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164)
+* Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119)
+* Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137)
+* Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071)
+* Add macro check for [`unreadable_literal`] [#4099](https://github.com/rust-lang/rust-clippy/pull/4099)
+
+## Rust 1.36
+
+Released 2019-07-04
+
+[eb9f9b1...082cfa7](https://github.com/rust-lang/rust-clippy/compare/eb9f9b1...082cfa7)
+
+* New lints: [`find_map`], [`filter_map_next`] [#4039](https://github.com/rust-lang/rust-clippy/pull/4039)
+* New lint: [`path_buf_push_overwrite`] [#3954](https://github.com/rust-lang/rust-clippy/pull/3954)
+* Move `path_buf_push_overwrite` to the nursery [#4013](https://github.com/rust-lang/rust-clippy/pull/4013)
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Allow allowing of [`toplevel_ref_arg`] lint [#4007](https://github.com/rust-lang/rust-clippy/pull/4007)
+* Fix false negative in [`or_fun_call`] pertaining to nested constructors [#4084](https://github.com/rust-lang/rust-clippy/pull/4084)
+* Fix false positive in [`or_fun_call`] pertaining to enum variant constructors [#4018](https://github.com/rust-lang/rust-clippy/pull/4018)
+* Fix false positive in [`useless_let_if_seq`] pertaining to interior mutability [#4035](https://github.com/rust-lang/rust-clippy/pull/4035)
+* Fix false positive in [`redundant_closure`] pertaining to non-function types [#4008](https://github.com/rust-lang/rust-clippy/pull/4008)
+* Fix false positive in [`let_and_return`] pertaining to attributes on `let`s [#4024](https://github.com/rust-lang/rust-clippy/pull/4024)
+* Fix false positive in [`module_name_repetitions`] lint pertaining to attributes [#4006](https://github.com/rust-lang/rust-clippy/pull/4006)
+* Fix false positive on [`assertions_on_constants`] pertaining to `debug_assert!` [#3989](https://github.com/rust-lang/rust-clippy/pull/3989)
+* Improve suggestion in [`map_clone`] to suggest `.copied()` where applicable [#3970](https://github.com/rust-lang/rust-clippy/pull/3970) [#4043](https://github.com/rust-lang/rust-clippy/pull/4043)
+* Improve suggestion for [`search_is_some`] [#4049](https://github.com/rust-lang/rust-clippy/pull/4049)
+* Improve suggestion applicability for [`naive_bytecount`] [#3984](https://github.com/rust-lang/rust-clippy/pull/3984)
+* Improve suggestion applicability for [`while_let_loop`] [#3975](https://github.com/rust-lang/rust-clippy/pull/3975)
+* Improve diagnostics for [`too_many_arguments`] [#4053](https://github.com/rust-lang/rust-clippy/pull/4053)
+* Improve diagnostics for [`cast_lossless`] [#4021](https://github.com/rust-lang/rust-clippy/pull/4021)
+* Deal with macro checks in desugarings better [#4082](https://github.com/rust-lang/rust-clippy/pull/4082)
+* Add macro check for [`unnecessary_cast`] [#4026](https://github.com/rust-lang/rust-clippy/pull/4026)
+* Remove [`approx_constant`]'s documentation's "Known problems" section. [#4027](https://github.com/rust-lang/rust-clippy/pull/4027)
+* Fix ICE in [`suspicious_else_formatting`] [#3960](https://github.com/rust-lang/rust-clippy/pull/3960)
+* Fix ICE in [`decimal_literal_representation`] [#3931](https://github.com/rust-lang/rust-clippy/pull/3931)
+
+
+## Rust 1.35
+
+Released 2019-05-20
+
+[1fac380..37f5c1e](https://github.com/rust-lang/rust-clippy/compare/1fac380...37f5c1e)
+
+* New lint: `drop_bounds` to detect `T: Drop` bounds
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Rename `cyclomatic_complexity` to [`cognitive_complexity`], start work on making lint more practical for Rust code
+* Move [`get_unwrap`] to the restriction category
+* Improve suggestions for [`iter_cloned_collect`]
+* Improve suggestions for [`cast_lossless`] to suggest suffixed literals
+* Fix false positives in [`print_with_newline`] and [`write_with_newline`] pertaining to raw strings
+* Fix false positive in [`needless_range_loop`] pertaining to structs without a `.iter()`
+* Fix false positive in [`bool_comparison`] pertaining to non-bool types
+* Fix false positive in [`redundant_closure`] pertaining to differences in borrows
+* Fix false positive in `option_map_unwrap_or` on non-copy types
+* Fix false positives in [`missing_const_for_fn`] pertaining to macros and trait method impls
+* Fix false positive in [`needless_pass_by_value`] pertaining to procedural macros
+* Fix false positive in [`needless_continue`] pertaining to loop labels
+* Fix false positive for [`boxed_local`] pertaining to arguments moved into closures
+* Fix false positive for [`use_self`] in nested functions
+* Fix suggestion for [`expect_fun_call`] (https://github.com/rust-lang/rust-clippy/pull/3846)
+* Fix suggestion for [`explicit_counter_loop`] to deal with parenthesizing range variables
+* Fix suggestion for [`single_char_pattern`] to correctly escape single quotes
+* Avoid triggering [`redundant_closure`] in macros
+* ICE fixes: [#3805](https://github.com/rust-lang/rust-clippy/pull/3805), [#3772](https://github.com/rust-lang/rust-clippy/pull/3772), [#3741](https://github.com/rust-lang/rust-clippy/pull/3741)
+
+## Rust 1.34
+
+Released 2019-04-10
+
+[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/1b89724...1fac380)
+
+* New lint: [`assertions_on_constants`] to detect for example `assert!(true)`
+* New lint: [`dbg_macro`] to detect uses of the `dbg!` macro
+* New lint: [`missing_const_for_fn`] that can suggest functions to be made `const`
+* New lint: [`too_many_lines`] to detect functions with excessive LOC. It can be
+ configured using the `too-many-lines-threshold` configuration.
+* New lint: [`wildcard_enum_match_arm`] to check for wildcard enum matches using `_`
+* Expand `redundant_closure` to also work for methods (not only functions)
+* Fix ICEs in `vec_box`, `needless_pass_by_value` and `implicit_hasher`
+* Fix false positive in `cast_sign_loss`
+* Fix false positive in `integer_arithmetic`
+* Fix false positive in `unit_arg`
+* Fix false positives in `implicit_return`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `cast_lossless`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `needless_bool`
+* Fix incorrect suggestion for `needless_range_loop`
+* Fix incorrect suggestion for `use_self`
+* Fix incorrect suggestion for `while_let_on_iterator`
+* Clippy is now slightly easier to invoke in non-cargo contexts. See
+ [#3665][pull3665] for more details.
+* We now have [improved documentation][adding_lints] on how to add new lints
+
+## Rust 1.33
+
+Released 2019-02-26
+
+[b2601be...1b89724](https://github.com/rust-lang/rust-clippy/compare/b2601be...1b89724)
+
+* New lints: [`implicit_return`], [`vec_box`], [`cast_ref_to_mut`]
+* The `rust-clippy` repository is now part of the `rust-lang` org.
+* Rename `stutter` to `module_name_repetitions`
+* Merge `new_without_default_derive` into `new_without_default` lint
+* Move `large_digit_groups` from `style` group to `pedantic`
+* Expand `bool_comparison` to check for `<`, `<=`, `>`, `>=`, and `!=`
+ comparisons against booleans
+* Expand `no_effect` to detect writes to constants such as `A_CONST.field = 2`
+* Expand `redundant_clone` to work on struct fields
+* Expand `suspicious_else_formatting` to detect `if .. {..} {..}`
+* Expand `use_self` to work on tuple structs and also in local macros
+* Fix ICE in `result_map_unit_fn` and `option_map_unit_fn`
+* Fix false positives in `implicit_return`
+* Fix false positives in `use_self`
+* Fix false negative in `clone_on_copy`
+* Fix false positive in `doc_markdown`
+* Fix false positive in `empty_loop`
+* Fix false positive in `if_same_then_else`
+* Fix false positive in `infinite_iter`
+* Fix false positive in `question_mark`
+* Fix false positive in `useless_asref`
+* Fix false positive in `wildcard_dependencies`
+* Fix false positive in `write_with_newline`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `get_unwrap`
+
+## Rust 1.32
+
+Released 2019-01-17
+
+[2e26fdc2...b2601be](https://github.com/rust-lang/rust-clippy/compare/2e26fdc2...b2601be)
+
+* New lints: [`slow_vector_initialization`], `mem_discriminant_non_enum`,
+ [`redundant_clone`], [`wildcard_dependencies`],
+ [`into_iter_on_ref`], `into_iter_on_array`, [`deprecated_cfg_attr`],
+ [`cargo_common_metadata`]
+* Add support for `u128` and `i128` to integer related lints
+* Add float support to `mistyped_literal_suffixes`
+* Fix false positives in `use_self`
+* Fix false positives in `missing_comma`
+* Fix false positives in `new_ret_no_self`
+* Fix false positives in `possible_missing_comma`
+* Fix false positive in `integer_arithmetic` in constant items
+* Fix false positive in `needless_borrow`
+* Fix false positive in `out_of_bounds_indexing`
+* Fix false positive in `new_without_default_derive`
+* Fix false positive in `string_lit_as_bytes`
+* Fix false negative in `out_of_bounds_indexing`
+* Fix false negative in `use_self`. It will now also check existential types
+* Fix incorrect suggestion for `redundant_closure_call`
+* Fix various suggestions that contained expanded macros
+* Fix `bool_comparison` triggering 3 times on on on the same code
+* Expand `trivially_copy_pass_by_ref` to work on trait methods
+* Improve suggestion for `needless_range_loop`
+* Move `needless_pass_by_value` from `pedantic` group to `style`
+
+## Rust 1.31
+
+Released 2018-12-06
+
+[125907ad..2e26fdc2](https://github.com/rust-lang/rust-clippy/compare/125907ad..2e26fdc2)
+
+* Clippy has been relicensed under a dual MIT / Apache license.
+ See [#3093](https://github.com/rust-lang/rust-clippy/issues/3093) for more
+ information.
+* With Rust 1.31, Clippy is no longer available via crates.io. The recommended
+ installation method is via `rustup component add clippy`.
+* New lints: [`redundant_pattern_matching`], [`unnecessary_filter_map`],
+ [`unused_unit`], [`map_flatten`], [`mem_replace_option_with_none`]
+* Fix ICE in `if_let_redundant_pattern_matching`
+* Fix ICE in `needless_pass_by_value` when encountering a generic function
+ argument with a lifetime parameter
+* Fix ICE in `needless_range_loop`
+* Fix ICE in `single_char_pattern` when encountering a constant value
+* Fix false positive in `assign_op_pattern`
+* Fix false positive in `boxed_local` on trait implementations
+* Fix false positive in `cmp_owned`
+* Fix false positive in `collapsible_if` when conditionals have comments
+* Fix false positive in `double_parens`
+* Fix false positive in `excessive_precision`
+* Fix false positive in `explicit_counter_loop`
+* Fix false positive in `fn_to_numeric_cast_with_truncation`
+* Fix false positive in `map_clone`
+* Fix false positive in `new_ret_no_self`
+* Fix false positive in `new_without_default` when `new` is unsafe
+* Fix false positive in `type_complexity` when using extern types
+* Fix false positive in `useless_format`
+* Fix false positive in `wrong_self_convention`
+* Fix incorrect suggestion for `excessive_precision`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `get_unwrap`
+* Fix incorrect suggestion for `useless_format`
+* `fn_to_numeric_cast_with_truncation` lint can be disabled again
+* Improve suggestions for `manual_memcpy`
+* Improve help message for `needless_lifetimes`
+
+## Rust 1.30
+
+Released 2018-10-25
+
+[14207503...125907ad](https://github.com/rust-lang/rust-clippy/compare/14207503...125907ad)
+
+* Deprecate `assign_ops` lint
+* New lints: [`mistyped_literal_suffixes`], [`ptr_offset_with_cast`],
+ [`needless_collect`], [`copy_iterator`]
+* `cargo clippy -V` now includes the Clippy commit hash of the Rust
+ Clippy component
+* Fix ICE in `implicit_hasher`
+* Fix ICE when encountering `println!("{}" a);`
+* Fix ICE when encountering a macro call in match statements
+* Fix false positive in `default_trait_access`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `similar_names`
+* Fix false positive in `redundant_field_name`
+* Fix false positive in `expect_fun_call`
+* Fix false negative in `identity_conversion`
+* Fix false negative in `explicit_counter_loop`
+* Fix `range_plus_one` suggestion and false negative
+* `print_with_newline` / `write_with_newline`: don't warn about string with several `\n`s in them
+* Fix `useless_attribute` to also whitelist `unused_extern_crates`
+* Fix incorrect suggestion for `single_char_pattern`
+* Improve suggestion for `identity_conversion` lint
+* Move `explicit_iter_loop` and `explicit_into_iter_loop` from `style` group to `pedantic`
+* Move `range_plus_one` and `range_minus_one` from `nursery` group to `complexity`
+* Move `shadow_unrelated` from `restriction` group to `pedantic`
+* Move `indexing_slicing` from `pedantic` group to `restriction`
+
+## Rust 1.29
+
+Released 2018-09-13
+
+[v0.0.212...14207503](https://github.com/rust-lang/rust-clippy/compare/v0.0.212...14207503)
+
+* :tada: :tada: **Rust 1.29 is the first stable Rust that includes a bundled Clippy** :tada:
+ :tada:
+ You can now run `rustup component add clippy-preview` and then `cargo
+ clippy` to run Clippy. This should put an end to the continuous nightly
+ upgrades for Clippy users.
+* Clippy now follows the Rust versioning scheme instead of its own
+* Fix ICE when encountering a `while let (..) = x.iter()` construct
+* Fix false positives in `use_self`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `useless_attribute` lint
+* Fix false positive in `print_literal`
+* Fix `use_self` regressions
+* Improve lint message for `neg_cmp_op_on_partial_ord`
+* Improve suggestion highlight for `single_char_pattern`
+* Improve suggestions for various print/write macro lints
+* Improve website header
+
+## 0.0.212 (2018-07-10)
+* Rustup to *rustc 1.29.0-nightly (e06c87544 2018-07-06)*
+
+## 0.0.211
+* Rustup to *rustc 1.28.0-nightly (e3bf634e0 2018-06-28)*
+
+## 0.0.210
+* Rustup to *rustc 1.28.0-nightly (01cc982e9 2018-06-24)*
+
+## 0.0.209
+* Rustup to *rustc 1.28.0-nightly (523097979 2018-06-18)*
+
+## 0.0.208
+* Rustup to *rustc 1.28.0-nightly (86a8f1a63 2018-06-17)*
+
+## 0.0.207
+* Rustup to *rustc 1.28.0-nightly (2a0062974 2018-06-09)*
+
+## 0.0.206
+* Rustup to *rustc 1.28.0-nightly (5bf68db6e 2018-05-28)*
+
+## 0.0.205
+* Rustup to *rustc 1.28.0-nightly (990d8aa74 2018-05-25)*
+* Rename `unused_lifetimes` to `extra_unused_lifetimes` because of naming conflict with new rustc lint
+
+## 0.0.204
+* Rustup to *rustc 1.28.0-nightly (71e87be38 2018-05-22)*
+
+## 0.0.203
+* Rustup to *rustc 1.28.0-nightly (a3085756e 2018-05-19)*
+* Clippy attributes are now of the form `clippy::cyclomatic_complexity` instead of `clippy(cyclomatic_complexity)`
+
+## 0.0.202
+* Rustup to *rustc 1.28.0-nightly (952f344cd 2018-05-18)*
+
+## 0.0.201
+* Rustup to *rustc 1.27.0-nightly (2f2a11dfc 2018-05-16)*
+
+## 0.0.200
+* Rustup to *rustc 1.27.0-nightly (9fae15374 2018-05-13)*
+
+## 0.0.199
+* Rustup to *rustc 1.27.0-nightly (ff2ac35db 2018-05-12)*
+
+## 0.0.198
+* Rustup to *rustc 1.27.0-nightly (acd3871ba 2018-05-10)*
+
+## 0.0.197
+* Rustup to *rustc 1.27.0-nightly (428ea5f6b 2018-05-06)*
+
+## 0.0.196
+* Rustup to *rustc 1.27.0-nightly (e82261dfb 2018-05-03)*
+
+## 0.0.195
+* Rustup to *rustc 1.27.0-nightly (ac3c2288f 2018-04-18)*
+
+## 0.0.194
+* Rustup to *rustc 1.27.0-nightly (bd40cbbe1 2018-04-14)*
+* New lints: [`cast_ptr_alignment`], [`transmute_ptr_to_ptr`], [`write_literal`], [`write_with_newline`], [`writeln_empty_string`]
+
+## 0.0.193
+* Rustup to *rustc 1.27.0-nightly (eeea94c11 2018-04-06)*
+
+## 0.0.192
+* Rustup to *rustc 1.27.0-nightly (fb44b4c0e 2018-04-04)*
+* New lint: [`print_literal`]
+
+## 0.0.191
+* Rustup to *rustc 1.26.0-nightly (ae544ee1c 2018-03-29)*
+* Lint audit; categorize lints as style, correctness, complexity, pedantic, nursery, restriction.
+
+## 0.0.190
+* Fix a bunch of intermittent cargo bugs
+
+## 0.0.189
+* Rustup to *rustc 1.26.0-nightly (5508b2714 2018-03-18)*
+
+## 0.0.188
+* Rustup to *rustc 1.26.0-nightly (392645394 2018-03-15)*
+* New lint: [`while_immutable_condition`]
+
+## 0.0.187
+* Rustup to *rustc 1.26.0-nightly (322d7f7b9 2018-02-25)*
+* New lints: [`redundant_field_names`], [`suspicious_arithmetic_impl`], [`suspicious_op_assign_impl`]
+
+## 0.0.186
+* Rustup to *rustc 1.25.0-nightly (0c6091fbd 2018-02-04)*
+* Various false positive fixes
+
+## 0.0.185
+* Rustup to *rustc 1.25.0-nightly (56733bc9f 2018-02-01)*
+* New lint: [`question_mark`]
+
+## 0.0.184
+* Rustup to *rustc 1.25.0-nightly (90eb44a58 2018-01-29)*
+* New lints: [`double_comparisons`], [`empty_line_after_outer_attr`]
+
+## 0.0.183
+* Rustup to *rustc 1.25.0-nightly (21882aad7 2018-01-28)*
+* New lint: [`misaligned_transmute`]
+
+## 0.0.182
+* Rustup to *rustc 1.25.0-nightly (a0dcecff9 2018-01-24)*
+* New lint: [`decimal_literal_representation`]
+
+## 0.0.181
+* Rustup to *rustc 1.25.0-nightly (97520ccb1 2018-01-21)*
+* New lints: [`else_if_without_else`], [`option_option`], [`unit_arg`], [`unnecessary_fold`]
+* Removed `unit_expr`
+* Various false positive fixes for [`needless_pass_by_value`]
+
+## 0.0.180
+* Rustup to *rustc 1.25.0-nightly (3f92e8d89 2018-01-14)*
+
+## 0.0.179
+* Rustup to *rustc 1.25.0-nightly (61452e506 2018-01-09)*
+
+## 0.0.178
+* Rustup to *rustc 1.25.0-nightly (ee220daca 2018-01-07)*
+
+## 0.0.177
+* Rustup to *rustc 1.24.0-nightly (250b49205 2017-12-21)*
+* New lint: [`match_as_ref`]
+
+## 0.0.176
+* Rustup to *rustc 1.24.0-nightly (0077d128d 2017-12-14)*
+
+## 0.0.175
+* Rustup to *rustc 1.24.0-nightly (bb42071f6 2017-12-01)*
+
+## 0.0.174
+* Rustup to *rustc 1.23.0-nightly (63739ab7b 2017-11-21)*
+
+## 0.0.173
+* Rustup to *rustc 1.23.0-nightly (33374fa9d 2017-11-20)*
+
+## 0.0.172
+* Rustup to *rustc 1.23.0-nightly (d0f8e2913 2017-11-16)*
+
+## 0.0.171
+* Rustup to *rustc 1.23.0-nightly (ff0f5de3b 2017-11-14)*
+
+## 0.0.170
+* Rustup to *rustc 1.23.0-nightly (d6b06c63a 2017-11-09)*
+
+## 0.0.169
+* Rustup to *rustc 1.23.0-nightly (3b82e4c74 2017-11-05)*
+* New lints: [`just_underscores_and_digits`], `result_map_unwrap_or_else`, [`transmute_bytes_to_str`]
+
+## 0.0.168
+* Rustup to *rustc 1.23.0-nightly (f0fe716db 2017-10-30)*
+
+## 0.0.167
+* Rustup to *rustc 1.23.0-nightly (90ef3372e 2017-10-29)*
+* New lints: `const_static_lifetime`, [`erasing_op`], [`fallible_impl_from`], [`println_empty_string`], [`useless_asref`]
+
+## 0.0.166
+* Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)*
+* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], `invalid_ref`, [`option_map_or_none`],
+ [`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`],
+ [`transmute_int_to_float`]
+
+## 0.0.165
+* Rust upgrade to rustc 1.22.0-nightly (0e6f4cf51 2017-09-27)
+* New lint: [`mut_range_bound`]
+
+## 0.0.164
+* Update to *rustc 1.22.0-nightly (6c476ce46 2017-09-25)*
+* New lint: [`int_plus_one`]
+
+## 0.0.163
+* Update to *rustc 1.22.0-nightly (14039a42a 2017-09-22)*
+
+## 0.0.162
+* Update to *rustc 1.22.0-nightly (0701b37d9 2017-09-18)*
+* New lint: [`chars_last_cmp`]
+* Improved suggestions for [`needless_borrow`], [`ptr_arg`],
+
+## 0.0.161
+* Update to *rustc 1.22.0-nightly (539f2083d 2017-09-13)*
+
+## 0.0.160
+* Update to *rustc 1.22.0-nightly (dd08c3070 2017-09-12)*
+
+## 0.0.159
+* Update to *rustc 1.22.0-nightly (eba374fb2 2017-09-11)*
+* New lint: [`clone_on_ref_ptr`]
+
+## 0.0.158
+* New lint: [`manual_memcpy`]
+* [`cast_lossless`] no longer has redundant parentheses in its suggestions
+* Update to *rustc 1.22.0-nightly (dead08cb3 2017-09-08)*
+
+## 0.0.157 - 2017-09-04
+* Update to *rustc 1.22.0-nightly (981ce7d8d 2017-09-03)*
+* New lint: `unit_expr`
+
+## 0.0.156 - 2017-09-03
+* Update to *rustc 1.22.0-nightly (744dd6c1d 2017-09-02)*
+
+## 0.0.155
+* Update to *rustc 1.21.0-nightly (c11f689d2 2017-08-29)*
+* New lint: [`infinite_iter`], [`maybe_infinite_iter`], [`cast_lossless`]
+
+## 0.0.154
+* Update to *rustc 1.21.0-nightly (2c0558f63 2017-08-24)*
+* Fix [`use_self`] triggering inside derives
+* Add support for linting an entire workspace with `cargo clippy --all`
+* New lint: [`naive_bytecount`]
+
+## 0.0.153
+* Update to *rustc 1.21.0-nightly (8c303ed87 2017-08-20)*
+* New lint: [`use_self`]
+
+## 0.0.152
+* Update to *rustc 1.21.0-nightly (df511d554 2017-08-14)*
+
+## 0.0.151
+* Update to *rustc 1.21.0-nightly (13d94d5fa 2017-08-10)*
+
+## 0.0.150
+* Update to *rustc 1.21.0-nightly (215e0b10e 2017-08-08)*
+
+## 0.0.148
+* Update to *rustc 1.21.0-nightly (37c7d0ebb 2017-07-31)*
+* New lints: [`unreadable_literal`], [`inconsistent_digit_grouping`], [`large_digit_groups`]
+
+## 0.0.147
+* Update to *rustc 1.21.0-nightly (aac223f4f 2017-07-30)*
+
+## 0.0.146
+* Update to *rustc 1.21.0-nightly (52a330969 2017-07-27)*
+* Fixes false positives in `inline_always`
+* Fixes false negatives in `panic_params`
+
+## 0.0.145
+* Update to *rustc 1.20.0-nightly (afe145d22 2017-07-23)*
+
+## 0.0.144
+* Update to *rustc 1.20.0-nightly (086eaa78e 2017-07-15)*
+
+## 0.0.143
+* Update to *rustc 1.20.0-nightly (d84693b93 2017-07-09)*
+* Fix `cargo clippy` crashing on `dylib` projects
+* Fix false positives around `nested_while_let` and `never_loop`
+
+## 0.0.142
+* Update to *rustc 1.20.0-nightly (067971139 2017-07-02)*
+
+## 0.0.141
+* Rewrite of the `doc_markdown` lint.
+* Deprecated [`range_step_by_zero`]
+* New lint: [`iterator_step_by_zero`]
+* New lint: [`needless_borrowed_reference`]
+* Update to *rustc 1.20.0-nightly (69c65d296 2017-06-28)*
+
+## 0.0.140 - 2017-06-16
+* Update to *rustc 1.19.0-nightly (258ae6dd9 2017-06-15)*
+
+## 0.0.139 — 2017-06-10
+* Update to *rustc 1.19.0-nightly (4bf5c99af 2017-06-10)*
+* Fix bugs with for loop desugaring
+* Check for [`AsRef`]/[`AsMut`] arguments in [`wrong_self_convention`]
+
+## 0.0.138 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (0418fa9d3 2017-06-04)*
+
+## 0.0.137 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (6684d176c 2017-06-03)*
+
+## 0.0.136 — 2017—05—26
+* Update to *rustc 1.19.0-nightly (557967766 2017-05-26)*
+
+## 0.0.135 — 2017—05—24
+* Update to *rustc 1.19.0-nightly (5b13bff52 2017-05-23)*
+
+## 0.0.134 — 2017—05—19
+* Update to *rustc 1.19.0-nightly (0ed1ec9f9 2017-05-18)*
+
+## 0.0.133 — 2017—05—14
+* Update to *rustc 1.19.0-nightly (826d8f385 2017-05-13)*
+
+## 0.0.132 — 2017—05—05
+* Fix various bugs and some ices
+
+## 0.0.131 — 2017—05—04
+* Update to *rustc 1.19.0-nightly (2d4ed8e0c 2017-05-03)*
+
+## 0.0.130 — 2017—05—03
+* Update to *rustc 1.19.0-nightly (6a5fc9eec 2017-05-02)*
+
+## 0.0.129 — 2017-05-01
+* Update to *rustc 1.19.0-nightly (06fb4d256 2017-04-30)*
+
+## 0.0.128 — 2017-04-28
+* Update to *rustc 1.18.0-nightly (94e884b63 2017-04-27)*
+
+## 0.0.127 — 2017-04-27
+* Update to *rustc 1.18.0-nightly (036983201 2017-04-26)*
+* New lint: [`needless_continue`]
+
+## 0.0.126 — 2017-04-24
+* Update to *rustc 1.18.0-nightly (2bd4b5c6d 2017-04-23)*
+
+## 0.0.125 — 2017-04-19
+* Update to *rustc 1.18.0-nightly (9f2abadca 2017-04-18)*
+
+## 0.0.124 — 2017-04-16
+* Update to *rustc 1.18.0-nightly (d5cf1cb64 2017-04-15)*
+
+## 0.0.123 — 2017-04-07
+* Fix various false positives
+
+## 0.0.122 — 2017-04-07
+* Rustup to *rustc 1.18.0-nightly (91ae22a01 2017-04-05)*
+* New lint: [`op_ref`]
+
+## 0.0.121 — 2017-03-21
+* Rustup to *rustc 1.17.0-nightly (134c4a0f0 2017-03-20)*
+
+## 0.0.120 — 2017-03-17
+* Rustup to *rustc 1.17.0-nightly (0aeb9c129 2017-03-15)*
+
+## 0.0.119 — 2017-03-13
+* Rustup to *rustc 1.17.0-nightly (824c9ebbd 2017-03-12)*
+
+## 0.0.118 — 2017-03-05
+* Rustup to *rustc 1.17.0-nightly (b1e31766d 2017-03-03)*
+
+## 0.0.117 — 2017-03-01
+* Rustup to *rustc 1.17.0-nightly (be760566c 2017-02-28)*
+
+## 0.0.116 — 2017-02-28
+* Fix `cargo clippy` on 64 bit windows systems
+
+## 0.0.115 — 2017-02-27
+* Rustup to *rustc 1.17.0-nightly (60a0edc6c 2017-02-26)*
+* New lints: [`zero_ptr`], [`never_loop`], [`mut_from_ref`]
+
+## 0.0.114 — 2017-02-08
+* Rustup to *rustc 1.17.0-nightly (c49d10207 2017-02-07)*
+* Tests are now ui tests (testing the exact output of rustc)
+
+## 0.0.113 — 2017-02-04
+* Rustup to *rustc 1.16.0-nightly (eedaa94e3 2017-02-02)*
+* New lint: [`large_enum_variant`]
+* `explicit_into_iter_loop` provides suggestions
+
+## 0.0.112 — 2017-01-27
+* Rustup to *rustc 1.16.0-nightly (df8debf6d 2017-01-25)*
+
+## 0.0.111 — 2017-01-21
+* Rustup to *rustc 1.16.0-nightly (a52da95ce 2017-01-20)*
+
+## 0.0.110 — 2017-01-20
+* Add badges and categories to `Cargo.toml`
+
+## 0.0.109 — 2017-01-19
+* Update to *rustc 1.16.0-nightly (c07a6ae77 2017-01-17)*
+
+## 0.0.108 — 2017-01-12
+* Update to *rustc 1.16.0-nightly (2782e8f8f 2017-01-12)*
+
+## 0.0.107 — 2017-01-11
+* Update regex dependency
+* Fix FP when matching `&&mut` by `&ref`
+* Reintroduce `for (_, x) in &mut hash_map` -> `for x in hash_map.values_mut()`
+* New lints: [`unused_io_amount`], [`forget_ref`], [`short_circuit_statement`]
+
+## 0.0.106 — 2017-01-04
+* Fix FP introduced by rustup in [`wrong_self_convention`]
+
+## 0.0.105 — 2017-01-04
+* Update to *rustc 1.16.0-nightly (468227129 2017-01-03)*
+* New lints: [`deref_addrof`], [`double_parens`], [`pub_enum_variant_names`]
+* Fix suggestion in [`new_without_default`]
+* FP fix in [`absurd_extreme_comparisons`]
+
+## 0.0.104 — 2016-12-15
+* Update to *rustc 1.15.0-nightly (8f02c429a 2016-12-15)*
+
+## 0.0.103 — 2016-11-25
+* Update to *rustc 1.15.0-nightly (d5814b03e 2016-11-23)*
+
+## 0.0.102 — 2016-11-24
+* Update to *rustc 1.15.0-nightly (3bf2be9ce 2016-11-22)*
+
+## 0.0.101 — 2016-11-23
+* Update to *rustc 1.15.0-nightly (7b3eeea22 2016-11-21)*
+* New lint: [`string_extend_chars`]
+
+## 0.0.100 — 2016-11-20
+* Update to *rustc 1.15.0-nightly (ac635aa95 2016-11-18)*
+
+## 0.0.99 — 2016-11-18
+* Update to rustc 1.15.0-nightly (0ed951993 2016-11-14)
+* New lint: [`get_unwrap`]
+
+## 0.0.98 — 2016-11-08
+* Fixes an issue due to a change in how cargo handles `--sysroot`, which broke `cargo clippy`
+
+## 0.0.97 — 2016-11-03
+* For convenience, `cargo clippy` defines a `cargo-clippy` feature. This was
+ previously added for a short time under the name `clippy` but removed for
+ compatibility.
+* `cargo clippy --help` is more helping (and less helpful :smile:)
+* Rustup to *rustc 1.14.0-nightly (5665bdf3e 2016-11-02)*
+* New lints: [`if_let_redundant_pattern_matching`], [`partialeq_ne_impl`]
+
+## 0.0.96 — 2016-10-22
+* Rustup to *rustc 1.14.0-nightly (f09420685 2016-10-20)*
+* New lint: [`iter_skip_next`]
+
+## 0.0.95 — 2016-10-06
+* Rustup to *rustc 1.14.0-nightly (3210fd5c2 2016-10-05)*
+
+## 0.0.94 — 2016-10-04
+* Fixes bustage on Windows due to forbidden directory name
+
+## 0.0.93 — 2016-10-03
+* Rustup to *rustc 1.14.0-nightly (144af3e97 2016-10-02)*
+* `option_map_unwrap_or` and `option_map_unwrap_or_else` are now
+ allowed by default.
+* New lint: [`explicit_into_iter_loop`]
+
+## 0.0.92 — 2016-09-30
+* Rustup to *rustc 1.14.0-nightly (289f3a4ca 2016-09-29)*
+
+## 0.0.91 — 2016-09-28
+* Rustup to *rustc 1.13.0-nightly (d0623cf7b 2016-09-26)*
+
+## 0.0.90 — 2016-09-09
+* Rustup to *rustc 1.13.0-nightly (f1f40f850 2016-09-09)*
+
+## 0.0.89 — 2016-09-06
+* Rustup to *rustc 1.13.0-nightly (cbe4de78e 2016-09-05)*
+
+## 0.0.88 — 2016-09-04
+* Rustup to *rustc 1.13.0-nightly (70598e04f 2016-09-03)*
+* The following lints are not new but were only usable through the `clippy`
+ lint groups: [`filter_next`], `for_loop_over_option`,
+ `for_loop_over_result` and [`match_overlapping_arm`]. You should now be
+ able to `#[allow/deny]` them individually and they are available directly
+ through `cargo clippy`.
+
+## 0.0.87 — 2016-08-31
+* Rustup to *rustc 1.13.0-nightly (eac41469d 2016-08-30)*
+* New lints: [`builtin_type_shadow`]
+* Fix FP in [`zero_prefixed_literal`] and `0b`/`0o`
+
+## 0.0.86 — 2016-08-28
+* Rustup to *rustc 1.13.0-nightly (a23064af5 2016-08-27)*
+* New lints: [`missing_docs_in_private_items`], [`zero_prefixed_literal`]
+
+## 0.0.85 — 2016-08-19
+* Fix ICE with [`useless_attribute`]
+* [`useless_attribute`] ignores `unused_imports` on `use` statements
+
+## 0.0.84 — 2016-08-18
+* Rustup to *rustc 1.13.0-nightly (aef6971ca 2016-08-17)*
+
+## 0.0.83 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (1bf5fa326 2016-08-16)*
+* New lints: [`print_with_newline`], [`useless_attribute`]
+
+## 0.0.82 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (197be89f3 2016-08-15)*
+* New lint: [`module_inception`]
+
+## 0.0.81 — 2016-08-14
+* Rustup to *rustc 1.12.0-nightly (1deb02ea6 2016-08-12)*
+* New lints: [`eval_order_dependence`], [`mixed_case_hex_literals`], [`unseparated_literal_suffix`]
+* False positive fix in [`too_many_arguments`]
+* Addition of functionality to [`needless_borrow`]
+* Suggestions for [`clone_on_copy`]
+* Bug fix in [`wrong_self_convention`]
+* Doc improvements
+
+## 0.0.80 — 2016-07-31
+* Rustup to *rustc 1.12.0-nightly (1225e122f 2016-07-30)*
+* New lints: [`misrefactored_assign_op`], [`serde_api_misuse`]
+
+## 0.0.79 — 2016-07-10
+* Rustup to *rustc 1.12.0-nightly (f93aaf84c 2016-07-09)*
+* Major suggestions refactoring
+
+## 0.0.78 — 2016-07-02
+* Rustup to *rustc 1.11.0-nightly (01411937f 2016-07-01)*
+* New lints: [`wrong_transmute`], [`double_neg`], [`filter_map`]
+* For compatibility, `cargo clippy` does not defines the `clippy` feature
+ introduced in 0.0.76 anymore
+* [`collapsible_if`] now considers `if let`
+
+## 0.0.77 — 2016-06-21
+* Rustup to *rustc 1.11.0-nightly (5522e678b 2016-06-20)*
+* New lints: `stutter` and [`iter_nth`]
+
+## 0.0.76 — 2016-06-10
+* Rustup to *rustc 1.11.0-nightly (7d2f75a95 2016-06-09)*
+* `cargo clippy` now automatically defines the `clippy` feature
+* New lint: [`not_unsafe_ptr_arg_deref`]
+
+## 0.0.75 — 2016-06-08
+* Rustup to *rustc 1.11.0-nightly (763f9234b 2016-06-06)*
+
+## 0.0.74 — 2016-06-07
+* Fix bug with `cargo-clippy` JSON parsing
+* Add the `CLIPPY_DISABLE_DOCS_LINKS` environment variable to deactivate the
+ “for further information visit *lint-link*” message.
+
+## 0.0.73 — 2016-06-05
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.72 — 2016-06-04
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.71 — 2016-05-31
+* Rustup to *rustc 1.11.0-nightly (a967611d8 2016-05-30)*
+* New lint: [`useless_let_if_seq`]
+
+## 0.0.70 — 2016-05-28
+* Rustup to *rustc 1.10.0-nightly (7bddce693 2016-05-27)*
+* [`invalid_regex`] and [`trivial_regex`] can now warn on `RegexSet::new`,
+ `RegexBuilder::new` and byte regexes
+
+## 0.0.69 — 2016-05-20
+* Rustup to *rustc 1.10.0-nightly (476fe6eef 2016-05-21)*
+* [`used_underscore_binding`] has been made `Allow` temporarily
+
+## 0.0.68 — 2016-05-17
+* Rustup to *rustc 1.10.0-nightly (cd6a40017 2016-05-16)*
+* New lint: [`unnecessary_operation`]
+
+## 0.0.67 — 2016-05-12
+* Rustup to *rustc 1.10.0-nightly (22ac88f1a 2016-05-11)*
+
+## 0.0.66 — 2016-05-11
+* New `cargo clippy` subcommand
+* New lints: [`assign_op_pattern`], [`assign_ops`], [`needless_borrow`]
+
+## 0.0.65 — 2016-05-08
+* Rustup to *rustc 1.10.0-nightly (62e2b2fb7 2016-05-06)*
+* New lints: [`float_arithmetic`], [`integer_arithmetic`]
+
+## 0.0.64 — 2016-04-26
+* Rustup to *rustc 1.10.0-nightly (645dd013a 2016-04-24)*
+* New lints: `temporary_cstring_as_ptr`, [`unsafe_removed_from_name`], and [`mem_forget`]
+
+## 0.0.63 — 2016-04-08
+* Rustup to *rustc 1.9.0-nightly (7979dd608 2016-04-07)*
+
+## 0.0.62 — 2016-04-07
+* Rustup to *rustc 1.9.0-nightly (bf5da36f1 2016-04-06)*
+
+## 0.0.61 — 2016-04-03
+* Rustup to *rustc 1.9.0-nightly (5ab11d72c 2016-04-02)*
+* New lint: [`invalid_upcast_comparisons`]
+
+## 0.0.60 — 2016-04-01
+* Rustup to *rustc 1.9.0-nightly (e1195c24b 2016-03-31)*
+
+## 0.0.59 — 2016-03-31
+* Rustup to *rustc 1.9.0-nightly (30a3849f2 2016-03-30)*
+* New lints: [`logic_bug`], [`nonminimal_bool`]
+* Fixed: [`match_same_arms`] now ignores arms with guards
+* Improved: [`useless_vec`] now warns on `for … in vec![…]`
+
+## 0.0.58 — 2016-03-27
+* Rustup to *rustc 1.9.0-nightly (d5a91e695 2016-03-26)*
+* New lint: [`doc_markdown`]
+
+## 0.0.57 — 2016-03-27
+* Update to *rustc 1.9.0-nightly (a1e29daf1 2016-03-25)*
+* Deprecated lints: [`str_to_string`], [`string_to_string`], [`unstable_as_slice`], [`unstable_as_mut_slice`]
+* New lint: [`crosspointer_transmute`]
+
+## 0.0.56 — 2016-03-23
+* Update to *rustc 1.9.0-nightly (0dcc413e4 2016-03-22)*
+* New lints: [`many_single_char_names`] and [`similar_names`]
+
+## 0.0.55 — 2016-03-21
+* Update to *rustc 1.9.0-nightly (02310fd31 2016-03-19)*
+
+## 0.0.54 — 2016-03-16
+* Update to *rustc 1.9.0-nightly (c66d2380a 2016-03-15)*
+
+## 0.0.53 — 2016-03-15
+* Add a [configuration file]
+
+## ~~0.0.52~~
+
+## 0.0.51 — 2016-03-13
+* Add `str` to types considered by [`len_zero`]
+* New lints: [`indexing_slicing`]
+
+## 0.0.50 — 2016-03-11
+* Update to *rustc 1.9.0-nightly (c9629d61c 2016-03-10)*
+
+## 0.0.49 — 2016-03-09
+* Update to *rustc 1.9.0-nightly (eabfc160f 2016-03-08)*
+* New lints: [`overflow_check_conditional`], `unused_label`, [`new_without_default`]
+
+## 0.0.48 — 2016-03-07
+* Fixed: ICE in [`needless_range_loop`] with globals
+
+## 0.0.47 — 2016-03-07
+* Update to *rustc 1.9.0-nightly (998a6720b 2016-03-07)*
+* New lint: [`redundant_closure_call`]
+
+[`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
+[`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
+[configuration file]: ./rust-clippy#configuration
+[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
+[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/adding_lints.md
+[`README.md`]: https://github.com/rust-lang/rust-clippy/blob/master/README.md
+
+<!-- lint disable no-unused-definitions -->
+<!-- begin autogenerated links to lint list -->
+[`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons
+[`alloc_instead_of_core`]: https://rust-lang.github.io/rust-clippy/master/index.html#alloc_instead_of_core
+[`allow_attributes_without_reason`]: https://rust-lang.github.io/rust-clippy/master/index.html#allow_attributes_without_reason
+[`almost_complete_letter_range`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_complete_letter_range
+[`almost_swapped`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_swapped
+[`approx_constant`]: https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
+[`arithmetic_side_effects`]: https://rust-lang.github.io/rust-clippy/master/index.html#arithmetic_side_effects
+[`as_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_conversions
++[`as_ptr_cast_mut`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_ptr_cast_mut
+[`as_underscore`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_underscore
+[`assertions_on_constants`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_constants
+[`assertions_on_result_states`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states
+[`assign_op_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
+[`assign_ops`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_ops
+[`async_yields_async`]: https://rust-lang.github.io/rust-clippy/master/index.html#async_yields_async
+[`await_holding_invalid_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_invalid_type
+[`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock
+[`await_holding_refcell_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_refcell_ref
+[`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask
+[`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map
+[`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name
+[`blanket_clippy_restriction_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#blanket_clippy_restriction_lints
+[`block_in_if_condition_expr`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_expr
+[`block_in_if_condition_stmt`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_stmt
+[`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions
+[`bool_assert_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_assert_comparison
+[`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
+[`bool_to_int_with_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_to_int_with_if
+[`borrow_as_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_as_ptr
+[`borrow_deref_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_deref_ref
+[`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const
+[`borrowed_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
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+[`zero_width_space`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_width_space
+[`zst_offset`]: https://rust-lang.github.io/rust-clippy/master/index.html#zst_offset
+<!-- end autogenerated links to lint list -->
--- /dev/null
- If you're new to Clippy and don't know where to start the [Clippy book] includes
+# Contributing to Clippy
+
+Hello fellow Rustacean! Great to see your interest in compiler internals and lints!
+
+**First**: if you're unsure or afraid of _anything_, just ask or submit the issue or pull request anyway. You won't be
+yelled at for giving it your best effort. The worst that can happen is that you'll be politely asked to change
+something. We appreciate any sort of contributions, and don't want a wall of rules to get in the way of that.
+
+Clippy welcomes contributions from everyone. There are many ways to contribute to Clippy and the following document
+explains how you can contribute and how to get started. If you have any questions about contributing or need help with
+anything, feel free to ask questions on issues or visit the `#clippy` on [Zulip].
+
+All contributors are expected to follow the [Rust Code of Conduct].
+
+- [Contributing to Clippy](#contributing-to-clippy)
+ - [The Clippy book](#the-clippy-book)
+ - [High level approach](#high-level-approach)
+ - [Finding something to fix/improve](#finding-something-to-fiximprove)
+ - [Getting code-completion for rustc internals to work](#getting-code-completion-for-rustc-internals-to-work)
+ - [IntelliJ Rust](#intellij-rust)
+ - [Rust Analyzer](#rust-analyzer)
+ - [How Clippy works](#how-clippy-works)
+ - [Issue and PR triage](#issue-and-pr-triage)
+ - [Bors and Homu](#bors-and-homu)
+ - [Contributions](#contributions)
+
+[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/clippy
+[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct
+
+## The Clippy book
+
++If you're new to Clippy and don't know where to start, the [Clippy book] includes
+a [developer guide] and is a good place to start your journey.
+
+[Clippy book]: https://doc.rust-lang.org/nightly/clippy/index.html
+[developer guide]: https://doc.rust-lang.org/nightly/clippy/development/index.html
+
+## High level approach
+
+1. Find something to fix/improve
+2. Change code (likely some file in `clippy_lints/src/`)
+3. Follow the instructions in the [Basics docs](book/src/development/basics.md)
+ to get set up
+4. Run `cargo test` in the root directory and wiggle code until it passes
+5. Open a PR (also can be done after 2. if you run into problems)
+
+## Finding something to fix/improve
+
+All issues on Clippy are mentored, if you want help simply ask someone from the
+Clippy team directly by mentioning them in the issue or over on [Zulip]. All
+currently active team members can be found
+[here](https://github.com/rust-lang/highfive/blob/master/highfive/configs/rust-lang/rust-clippy.json#L3)
+
+Some issues are easier than others. The [`good-first-issue`] label can be used to find the easy
+issues. You can use `@rustbot claim` to assign the issue to yourself.
+
+There are also some abandoned PRs, marked with [`S-inactive-closed`].
+Pretty often these PRs are nearly completed and just need some extra steps
+(formatting, addressing review comments, ...) to be merged. If you want to
+complete such a PR, please leave a comment in the PR and open a new one based
+on it.
+
+Issues marked [`T-AST`] involve simple matching of the syntax tree structure,
+and are generally easier than [`T-middle`] issues, which involve types
+and resolved paths.
+
+[`T-AST`] issues will generally need you to match against a predefined syntax structure.
+To figure out how this syntax structure is encoded in the AST, it is recommended to run
+`rustc -Z unpretty=ast-tree` on an example of the structure and compare with the [nodes in the AST docs].
+Usually the lint will end up to be a nested series of matches and ifs, [like so][deep-nesting].
+But we can make it nest-less by using [let chains], [like this][nest-less].
+
+[`E-medium`] issues are generally pretty easy too, though it's recommended you work on an [`good-first-issue`]
+first. Sometimes they are only somewhat involved code wise, but not difficult per-se.
+Note that [`E-medium`] issues may require some knowledge of Clippy internals or some
+debugging to find the actual problem behind the issue.
+
+[`T-middle`] issues can be more involved and require verifying types. The [`ty`] module contains a
+lot of methods that are useful, though one of the most useful would be `expr_ty` (gives the type of
+an AST expression). `match_def_path()` in Clippy's `utils` module can also be useful.
+
+[`good-first-issue`]: https://github.com/rust-lang/rust-clippy/labels/good-first-issue
+[`S-inactive-closed`]: https://github.com/rust-lang/rust-clippy/pulls?q=is%3Aclosed+label%3AS-inactive-closed
+[`T-AST`]: https://github.com/rust-lang/rust-clippy/labels/T-AST
+[`T-middle`]: https://github.com/rust-lang/rust-clippy/labels/T-middle
+[`E-medium`]: https://github.com/rust-lang/rust-clippy/labels/E-medium
+[`ty`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty
+[nodes in the AST docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/
+[deep-nesting]: https://github.com/rust-lang/rust-clippy/blob/5e4f0922911536f80d9591180fa604229ac13939/clippy_lints/src/mem_forget.rs#L31-L45
+[let chains]: https://github.com/rust-lang/rust/pull/94927
+[nest-less]: https://github.com/rust-lang/rust-clippy/blob/5e4f0922911536f80d9591180fa604229ac13939/clippy_lints/src/bit_mask.rs#L133-L159
+
+## Getting code-completion for rustc internals to work
+
+### IntelliJ Rust
+Unfortunately, [`IntelliJ Rust`][IntelliJ_rust_homepage] does not (yet?) understand how Clippy uses compiler-internals
+using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not
+available via a `rustup` component at the time of writing.
+To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via
+`git clone https://github.com/rust-lang/rust/`.
+Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies
+which `IntelliJ Rust` will be able to understand.
+Run `cargo dev setup intellij --repo-path <repo-path>` where `<repo-path>` is a path to the rustc repo
+you just cloned.
+The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to
+Clippy's `Cargo.toml`s and should allow `IntelliJ Rust` to understand most of the types that Clippy uses.
+Just make sure to remove the dependencies again before finally making a pull request!
+
+[rustc_repo]: https://github.com/rust-lang/rust/
+[IntelliJ_rust_homepage]: https://intellij-rust.github.io/
+
+### Rust Analyzer
+For [`rust-analyzer`][ra_homepage] to work correctly make sure that in the `rust-analyzer` configuration you set
+
+```json
+{ "rust-analyzer.rustc.source": "discover" }
+```
+
+You should be able to see information on things like `Expr` or `EarlyContext` now if you hover them, also
+a lot more type hints.
+
+To have `rust-analyzer` also work in the `clippy_dev` and `lintcheck` crates, add the following configuration
+
+```json
+{
+ "rust-analyzer.linkedProjects": [
+ "./Cargo.toml",
+ "clippy_dev/Cargo.toml",
+ "lintcheck/Cargo.toml",
+ ]
+}
+```
+
+[ra_homepage]: https://rust-analyzer.github.io/
+
+## How Clippy works
+
+[`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`].
+For example, the [`else_if_without_else`][else_if_without_else] lint is registered like this:
+
+```rust
+// ./clippy_lints/src/lib.rs
+
+// ...
+pub mod else_if_without_else;
+// ...
+
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ // ...
+ store.register_early_pass(|| box else_if_without_else::ElseIfWithoutElse);
+ // ...
+
+ store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
+ // ...
+ LintId::of(&else_if_without_else::ELSE_IF_WITHOUT_ELSE),
+ // ...
+ ]);
+}
+```
+
+The [`rustc_lint::LintStore`][`LintStore`] provides two methods to register lints:
+[register_early_pass][reg_early_pass] and [register_late_pass][reg_late_pass]. Both take an object
+that implements an [`EarlyLintPass`][early_lint_pass] or [`LateLintPass`][late_lint_pass] respectively. This is done in
+every single lint. It's worth noting that the majority of `clippy_lints/src/lib.rs` is autogenerated by `cargo dev
+update_lints`. When you are writing your own lint, you can use that script to save you some time.
+
+```rust
+// ./clippy_lints/src/else_if_without_else.rs
+
+use rustc_lint::{EarlyLintPass, EarlyContext};
+
+// ...
+
+pub struct ElseIfWithoutElse;
+
+// ...
+
+impl EarlyLintPass for ElseIfWithoutElse {
+ // ... the functions needed, to make the lint work
+}
+```
+
+The difference between `EarlyLintPass` and `LateLintPass` is that the methods of the `EarlyLintPass` trait only provide
+AST information. The methods of the `LateLintPass` trait are executed after type checking and contain type information
+via the `LateContext` parameter.
+
+That's why the `else_if_without_else` example uses the `register_early_pass` function. Because the
+[actual lint logic][else_if_without_else] does not depend on any type information.
+
+[lint_crate_entry]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
+[else_if_without_else]: https://github.com/rust-lang/rust-clippy/blob/4253aa7137cb7378acc96133c787e49a345c2b3c/clippy_lints/src/else_if_without_else.rs
+[`LintStore`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html
+[reg_early_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_early_pass
+[reg_late_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_late_pass
+[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
+[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
+
+## Issue and PR triage
+
+Clippy is following the [Rust triage procedure][triage] for issues and pull
+requests.
+
+However, we are a smaller project with all contributors being volunteers
+currently. Between writing new lints, fixing issues, reviewing pull requests and
+responding to issues there may not always be enough time to stay on top of it
+all.
+
+Our highest priority is fixing [crashes][l-crash] and [bugs][l-bug], for example
+an ICE in a popular crate that many other crates depend on. We don't
+want Clippy to crash on your code and we want it to be as reliable as the
+suggestions from Rust compiler errors.
+
+We have prioritization labels and a sync-blocker label, which are described below.
+- [P-low][p-low]: Requires attention (fix/response/evaluation) by a team member but isn't urgent.
+- [P-medium][p-medium]: Should be addressed by a team member until the next sync.
+- [P-high][p-high]: Should be immediately addressed and will require an out-of-cycle sync or a backport.
+- [L-sync-blocker][l-sync-blocker]: An issue that "blocks" a sync.
+Or rather: before the sync this should be addressed,
+e.g. by removing a lint again, so it doesn't hit beta/stable.
+
+## Bors and Homu
+
+We use a bot powered by [Homu][homu] to help automate testing and landing of pull
+requests in Clippy. The bot's username is @bors.
+
+You can find the Clippy bors queue [here][homu_queue].
+
+If you have @bors permissions, you can find an overview of the available
+commands [here][homu_instructions].
+
+[triage]: https://forge.rust-lang.org/release/triage-procedure.html
+[l-crash]: https://github.com/rust-lang/rust-clippy/labels/L-crash
+[l-bug]: https://github.com/rust-lang/rust-clippy/labels/L-bug
+[p-low]: https://github.com/rust-lang/rust-clippy/labels/P-low
+[p-medium]: https://github.com/rust-lang/rust-clippy/labels/P-medium
+[p-high]: https://github.com/rust-lang/rust-clippy/labels/P-high
+[l-sync-blocker]: https://github.com/rust-lang/rust-clippy/labels/L-sync-blocker
+[homu]: https://github.com/rust-lang/homu
+[homu_instructions]: https://bors.rust-lang.org/
+[homu_queue]: https://bors.rust-lang.org/queue/clippy
+
+## Contributions
+
+Contributions to Clippy should be made in the form of GitHub pull requests. Each pull request will
+be reviewed by a core contributor (someone with permission to land patches) and either landed in the
+main tree or given feedback for changes that would be required.
+
+All code in this repository is under the [Apache-2.0] or the [MIT] license.
+
+<!-- adapted from https://github.com/servo/servo/blob/master/CONTRIBUTING.md -->
+
+[Apache-2.0]: https://www.apache.org/licenses/LICENSE-2.0
+[MIT]: https://opensource.org/licenses/MIT
--- /dev/null
- `tests/ui/min_rust_version_attr.rs` which verifies that the lint isn't emitted
- if the project's MSRV is lower.
+# Adding a new lint
+
+You are probably here because you want to add a new lint to Clippy. If this is
+the first time you're contributing to Clippy, this document guides you through
+creating an example lint from scratch.
+
+To get started, we will create a lint that detects functions called `foo`,
+because that's clearly a non-descriptive name.
+
+- [Adding a new lint](#adding-a-new-lint)
+ - [Setup](#setup)
+ - [Getting Started](#getting-started)
+ - [Defining Our Lint](#defining-our-lint)
+ - [Standalone](#standalone)
+ - [Specific Type](#specific-type)
+ - [Tests Location](#tests-location)
+ - [Testing](#testing)
+ - [Cargo lints](#cargo-lints)
+ - [Rustfix tests](#rustfix-tests)
+ - [Testing manually](#testing-manually)
+ - [Lint declaration](#lint-declaration)
+ - [Lint registration](#lint-registration)
+ - [Lint passes](#lint-passes)
+ - [Emitting a lint](#emitting-a-lint)
+ - [Adding the lint logic](#adding-the-lint-logic)
+ - [Specifying the lint's minimum supported Rust version (MSRV)](#specifying-the-lints-minimum-supported-rust-version-msrv)
+ - [Author lint](#author-lint)
+ - [Print HIR lint](#print-hir-lint)
+ - [Documentation](#documentation)
+ - [Running rustfmt](#running-rustfmt)
+ - [Debugging](#debugging)
+ - [PR Checklist](#pr-checklist)
+ - [Adding configuration to a lint](#adding-configuration-to-a-lint)
+ - [Cheat Sheet](#cheat-sheet)
+
+## Setup
+
+See the [Basics](basics.md#get-the-code) documentation.
+
+## Getting Started
+
+There is a bit of boilerplate code that needs to be set up when creating a new
+lint. Fortunately, you can use the Clippy dev tools to handle this for you. We
+are naming our new lint `foo_functions` (lints are generally written in snake
+case), and we don't need type information, so it will have an early pass type
+(more on this later). If you're unsure if the name you chose fits the lint,
+take a look at our [lint naming guidelines][lint_naming].
+
+## Defining Our Lint
+To get started, there are two ways to define our lint.
+
+### Standalone
+Command: `cargo dev new_lint --name=foo_functions --pass=early --category=pedantic`
+(category will default to nursery if not provided)
+
+This command will create a new file: `clippy_lints/src/foo_functions.rs`, as well
+as [register the lint](#lint-registration).
+
+### Specific Type
+Command: `cargo dev new_lint --name=foo_functions --type=functions --category=pedantic`
+
+This command will create a new file: `clippy_lints/src/{type}/foo_functions.rs`.
+
+Notice how this command has a `--type` flag instead of `--pass`. Unlike a standalone
+definition, this lint won't be registered in the traditional sense. Instead, you will
+call your lint from within the type's lint pass, found in `clippy_lints/src/{type}/mod.rs`.
+
+A "type" is just the name of a directory in `clippy_lints/src`, like `functions` in
+the example command. These are groupings of lints with common behaviors, so if your
+lint falls into one, it would be best to add it to that type.
+
+### Tests Location
+Both commands will create a file: `tests/ui/foo_functions.rs`. For cargo lints,
+two project hierarchies (fail/pass) will be created by default under `tests/ui-cargo`.
+
+Next, we'll open up these files and add our lint!
+
+## Testing
+
+Let's write some tests first that we can execute while we iterate on our lint.
+
+Clippy uses UI tests for testing. UI tests check that the output of Clippy is
+exactly as expected. Each test is just a plain Rust file that contains the code
+we want to check. The output of Clippy is compared against a `.stderr` file.
+Note that you don't have to create this file yourself, we'll get to generating
+the `.stderr` files further down.
+
+We start by opening the test file created at `tests/ui/foo_functions.rs`.
+
+Update the file with some examples to get started:
+
+```rust
+#![allow(unused)]
+#![warn(clippy::foo_functions)]
+
+// Impl methods
+struct A;
+impl A {
+ pub fn fo(&self) {}
+ pub fn foo(&self) {}
+ pub fn food(&self) {}
+}
+
+// Default trait methods
+trait B {
+ fn fo(&self) {}
+ fn foo(&self) {}
+ fn food(&self) {}
+}
+
+// Plain functions
+fn fo() {}
+fn foo() {}
+fn food() {}
+
+fn main() {
+ // We also don't want to lint method calls
+ foo();
+ let a = A;
+ a.foo();
+}
+```
+
+Now we can run the test with `TESTNAME=foo_functions cargo uitest`, currently
+this test is meaningless though.
+
+While we are working on implementing our lint, we can keep running the UI test.
+That allows us to check if the output is turning into what we want.
+
+Once we are satisfied with the output, we need to run `cargo dev bless` to
+update the `.stderr` file for our lint. Please note that, we should run
+`TESTNAME=foo_functions cargo uitest` every time before running `cargo dev
+bless`. Running `TESTNAME=foo_functions cargo uitest` should pass then. When we
+commit our lint, we need to commit the generated `.stderr` files, too. In
+general, you should only commit files changed by `cargo dev bless` for the
+specific lint you are creating/editing. Note that if the generated files are
+empty, they should be removed.
+
+> _Note:_ you can run multiple test files by specifying a comma separated list:
+> `TESTNAME=foo_functions,test2,test3`.
+
+### Cargo lints
+
+For cargo lints, the process of testing differs in that we are interested in the
+`Cargo.toml` manifest file. We also need a minimal crate associated with that
+manifest.
+
+If our new lint is named e.g. `foo_categories`, after running `cargo dev
+new_lint` we will find by default two new crates, each with its manifest file:
+
+* `tests/ui-cargo/foo_categories/fail/Cargo.toml`: this file should cause the
+ new lint to raise an error.
+* `tests/ui-cargo/foo_categories/pass/Cargo.toml`: this file should not trigger
+ the lint.
+
+If you need more cases, you can copy one of those crates (under
+`foo_categories`) and rename it.
+
+The process of generating the `.stderr` file is the same, and prepending the
+`TESTNAME` variable to `cargo uitest` works too.
+
+## Rustfix tests
+
+If the lint you are working on is making use of structured suggestions, the test
+file should include a `// run-rustfix` comment at the top. This will
+additionally run [rustfix] for that test. Rustfix will apply the suggestions
+from the lint to the code of the test file and compare that to the contents of a
+`.fixed` file.
+
+Use `cargo dev bless` to automatically generate the `.fixed` file after running
+the tests.
+
+[rustfix]: https://github.com/rust-lang/rustfix
+
+## Testing manually
+
+Manually testing against an example file can be useful if you have added some
+`println!`s and the test suite output becomes unreadable. To try Clippy with
+your local modifications, run
+
+```
+cargo dev lint input.rs
+```
+
+from the working copy root. With tests in place, let's have a look at
+implementing our lint now.
+
+## Lint declaration
+
+Let's start by opening the new file created in the `clippy_lints` crate at
+`clippy_lints/src/foo_functions.rs`. That's the crate where all the lint code
+is. This file has already imported some initial things we will need:
+
+```rust
+use rustc_lint::{EarlyLintPass, EarlyContext};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_ast::ast::*;
+```
+
+The next step is to update the lint declaration. Lints are declared using the
+[`declare_clippy_lint!`][declare_clippy_lint] macro, and we just need to update
+the auto-generated lint declaration to have a real description, something like
+this:
+
+```rust
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// ### Why is this bad?
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code
+ /// ```
+ #[clippy::version = "1.29.0"]
+ pub FOO_FUNCTIONS,
+ pedantic,
+ "function named `foo`, which is not a descriptive name"
+}
+```
+
+* The section of lines prefixed with `///` constitutes the lint documentation
+ section. This is the default documentation style and will be displayed [like
+ this][example_lint_page]. To render and open this documentation locally in a
+ browser, run `cargo dev serve`.
+* The `#[clippy::version]` attribute will be rendered as part of the lint
+ documentation. The value should be set to the current Rust version that the
+ lint is developed in, it can be retrieved by running `rustc -vV` in the
+ rust-clippy directory. The version is listed under *release*. (Use the version
+ without the `-nightly`) suffix.
+* `FOO_FUNCTIONS` is the name of our lint. Be sure to follow the [lint naming
+ guidelines][lint_naming] here when naming your lint. In short, the name should
+ state the thing that is being checked for and read well when used with
+ `allow`/`warn`/`deny`.
+* `pedantic` sets the lint level to `Allow`. The exact mapping can be found
+ [here][category_level_mapping]
+* The last part should be a text that explains what exactly is wrong with the
+ code
+
+The rest of this file contains an empty implementation for our lint pass, which
+in this case is `EarlyLintPass` and should look like this:
+
+```rust
+// clippy_lints/src/foo_functions.rs
+
+// .. imports and lint declaration ..
+
+declare_lint_pass!(FooFunctions => [FOO_FUNCTIONS]);
+
+impl EarlyLintPass for FooFunctions {}
+```
+
+[declare_clippy_lint]: https://github.com/rust-lang/rust-clippy/blob/557f6848bd5b7183f55c1e1522a326e9e1df6030/clippy_lints/src/lib.rs#L60
+[example_lint_page]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
+[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
+[category_level_mapping]: https://github.com/rust-lang/rust-clippy/blob/557f6848bd5b7183f55c1e1522a326e9e1df6030/clippy_lints/src/lib.rs#L110
+
+## Lint registration
+
+When using `cargo dev new_lint`, the lint is automatically registered and
+nothing more has to be done.
+
+When declaring a new lint by hand and `cargo dev update_lints` is used, the lint
+pass may have to be registered manually in the `register_plugins` function in
+`clippy_lints/src/lib.rs`:
+
+```rust
+store.register_early_pass(|| Box::new(foo_functions::FooFunctions));
+```
+
+As one may expect, there is a corresponding `register_late_pass` method
+available as well. Without a call to one of `register_early_pass` or
+`register_late_pass`, the lint pass in question will not be run.
+
+One reason that `cargo dev update_lints` does not automate this step is that
+multiple lints can use the same lint pass, so registering the lint pass may
+already be done when adding a new lint. Another reason that this step is not
+automated is that the order that the passes are registered determines the order
+the passes actually run, which in turn affects the order that any emitted lints
+are output in.
+
+## Lint passes
+
+Writing a lint that only checks for the name of a function means that we only
+have to deal with the AST and don't have to deal with the type system at all.
+This is good, because it makes writing this particular lint less complicated.
+
+We have to make this decision with every new Clippy lint. It boils down to using
+either [`EarlyLintPass`][early_lint_pass] or [`LateLintPass`][late_lint_pass].
+
+In short, the `LateLintPass` has access to type information while the
+`EarlyLintPass` doesn't. If you don't need access to type information, use the
+`EarlyLintPass`. The `EarlyLintPass` is also faster. However linting speed
+hasn't really been a concern with Clippy so far.
+
+Since we don't need type information for checking the function name, we used
+`--pass=early` when running the new lint automation and all the imports were
+added accordingly.
+
+[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
+[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
+
+## Emitting a lint
+
+With UI tests and the lint declaration in place, we can start working on the
+implementation of the lint logic.
+
+Let's start by implementing the `EarlyLintPass` for our `FooFunctions`:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ // TODO: Emit lint here
+ }
+}
+```
+
+We implement the [`check_fn`][check_fn] method from the
+[`EarlyLintPass`][early_lint_pass] trait. This gives us access to various
+information about the function that is currently being checked. More on that in
+the next section. Let's worry about the details later and emit our lint for
+*every* function definition first.
+
+Depending on how complex we want our lint message to be, we can choose from a
+variety of lint emission functions. They can all be found in
+[`clippy_utils/src/diagnostics.rs`][diagnostics].
+
+`span_lint_and_help` seems most appropriate in this case. It allows us to
+provide an extra help message and we can't really suggest a better name
+automatically. This is how it looks:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ span_lint_and_help(
+ cx,
+ FOO_FUNCTIONS,
+ span,
+ "function named `foo`",
+ None,
+ "consider using a more meaningful name"
+ );
+ }
+}
+```
+
+Running our UI test should now produce output that contains the lint message.
+
+According to [the rustc-dev-guide], the text should be matter of fact and avoid
+capitalization and periods, unless multiple sentences are needed. When code or
+an identifier must appear in a message or label, it should be surrounded with
+single grave accents \`.
+
+[check_fn]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html#method.check_fn
+[diagnostics]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/diagnostics.rs
+[the rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/diagnostics.html
+
+## Adding the lint logic
+
+Writing the logic for your lint will most likely be different from our example,
+so this section is kept rather short.
+
+Using the [`check_fn`][check_fn] method gives us access to [`FnKind`][fn_kind]
+that has the [`FnKind::Fn`] variant. It provides access to the name of the
+function/method via an [`Ident`][ident].
+
+With that we can expand our `check_fn` method to:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ if is_foo_fn(fn_kind) {
+ span_lint_and_help(
+ cx,
+ FOO_FUNCTIONS,
+ span,
+ "function named `foo`",
+ None,
+ "consider using a more meaningful name"
+ );
+ }
+ }
+}
+```
+
+We separate the lint conditional from the lint emissions because it makes the
+code a bit easier to read. In some cases this separation would also allow to
+write some unit tests (as opposed to only UI tests) for the separate function.
+
+In our example, `is_foo_fn` looks like:
+
+```rust
+// use statements, impl EarlyLintPass, check_fn, ..
+
+fn is_foo_fn(fn_kind: FnKind<'_>) -> bool {
+ match fn_kind {
+ FnKind::Fn(_, ident, ..) => {
+ // check if `fn` name is `foo`
+ ident.name.as_str() == "foo"
+ }
+ // ignore closures
+ FnKind::Closure(..) => false
+ }
+}
+```
+
+Now we should also run the full test suite with `cargo test`. At this point
+running `cargo test` should produce the expected output. Remember to run `cargo
+dev bless` to update the `.stderr` file.
+
+`cargo test` (as opposed to `cargo uitest`) will also ensure that our lint
+implementation is not violating any Clippy lints itself.
+
+That should be it for the lint implementation. Running `cargo test` should now
+pass.
+
+[fn_kind]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/visit/enum.FnKind.html
+[`FnKind::Fn`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/visit/enum.FnKind.html#variant.Fn
+[ident]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/symbol/struct.Ident.html
+
+## Specifying the lint's minimum supported Rust version (MSRV)
+
+Sometimes a lint makes suggestions that require a certain version of Rust. For
+example, the `manual_strip` lint suggests using `str::strip_prefix` and
+`str::strip_suffix` which is only available after Rust 1.45. In such cases, you
+need to ensure that the MSRV configured for the project is >= the MSRV of the
+required Rust feature. If multiple features are required, just use the one with
+a lower MSRV.
+
+First, add an MSRV alias for the required feature in [`clippy_utils::msrvs`].
+This can be accessed later as `msrvs::STR_STRIP_PREFIX`, for example.
+
+```rust
+msrv_aliases! {
+ ..
+ 1,45,0 { STR_STRIP_PREFIX }
+}
+```
+
+In order to access the project-configured MSRV, you need to have an `msrv` field
+in the LintPass struct, and a constructor to initialize the field. The `msrv`
+value is passed to the constructor in `clippy_lints/lib.rs`.
+
+```rust
+pub struct ManualStrip {
+ msrv: Option<RustcVersion>,
+}
+
+impl ManualStrip {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+```
+
+The project's MSRV can then be matched against the feature MSRV in the LintPass
+using the `meets_msrv` utility function.
+
+``` rust
+if !meets_msrv(self.msrv, msrvs::STR_STRIP_PREFIX) {
+ return;
+}
+```
+
+The project's MSRV can also be specified as an inner attribute, which overrides
+the value from `clippy.toml`. This can be accounted for using the
+`extract_msrv_attr!(LintContext)` macro and passing
+`LateContext`/`EarlyContext`.
+
+```rust
+impl<'tcx> LateLintPass<'tcx> for ManualStrip {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ ...
+ }
+ extract_msrv_attr!(LateContext);
+}
+```
+
+Once the `msrv` is added to the lint, a relevant test case should be added to
++the lint's test file, `tests/ui/manual_strip.rs` in this example. It should
++have a case for the version below the MSRV and one with the same contents but
++for the MSRV version itself.
++
++```rust
++#![feature(custom_inner_attributes)]
++
++...
++
++fn msrv_1_44() {
++ #![clippy::msrv = "1.44"]
++
++ /* something that would trigger the lint */
++}
++
++fn msrv_1_45() {
++ #![clippy::msrv = "1.45"]
++
++ /* something that would trigger the lint */
++}
++```
+
+As a last step, the lint should be added to the lint documentation. This is done
+in `clippy_lints/src/utils/conf.rs`:
+
+```rust
+define_Conf! {
+ /// Lint: LIST, OF, LINTS, <THE_NEWLY_ADDED_LINT>. The minimum rust version that the project supports
+ (msrv: Option<String> = None),
+ ...
+}
+```
+
+[`clippy_utils::msrvs`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/msrvs/index.html
+
+## Author lint
+
+If you have trouble implementing your lint, there is also the internal `author`
+lint to generate Clippy code that detects the offending pattern. It does not
+work for all of the Rust syntax, but can give a good starting point.
+
+The quickest way to use it, is the [Rust playground:
+play.rust-lang.org][author_example]. Put the code you want to lint into the
+editor and add the `#[clippy::author]` attribute above the item. Then run Clippy
+via `Tools -> Clippy` and you should see the generated code in the output below.
+
+[Here][author_example] is an example on the playground.
+
+If the command was executed successfully, you can copy the code over to where
+you are implementing your lint.
+
+[author_example]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=9a12cb60e5c6ad4e3003ac6d5e63cf55
+
+## Print HIR lint
+
+To implement a lint, it's helpful to first understand the internal
+representation that rustc uses. Clippy has the `#[clippy::dump]` attribute that
+prints the [_High-Level Intermediate Representation (HIR)_] of the item,
+statement, or expression that the attribute is attached to. To attach the
+attribute to expressions you often need to enable
+`#![feature(stmt_expr_attributes)]`.
+
+[Here][print_hir_example] you can find an example, just select _Tools_ and run
+_Clippy_.
+
+[_High-Level Intermediate Representation (HIR)_]: https://rustc-dev-guide.rust-lang.org/hir.html
+[print_hir_example]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=daf14db3a7f39ca467cd1b86c34b9afb
+
+## Documentation
+
+The final thing before submitting our PR is to add some documentation to our
+lint declaration.
+
+Please document your lint with a doc comment akin to the following:
+
+```rust
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for ... (describe what the lint matches).
+ ///
+ /// ### Why is this bad?
+ /// Supply the reason for linting the code.
+ ///
+ /// ### Example
+ ///
+ /// ```rust,ignore
+ /// // A short example of code that triggers the lint
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// // A short example of improved code that doesn't trigger the lint
+ /// ```
+ #[clippy::version = "1.29.0"]
+ pub FOO_FUNCTIONS,
+ pedantic,
+ "function named `foo`, which is not a descriptive name"
+}
+```
+
+Once your lint is merged, this documentation will show up in the [lint
+list][lint_list].
+
+[lint_list]: https://rust-lang.github.io/rust-clippy/master/index.html
+
+## Running rustfmt
+
+[Rustfmt] is a tool for formatting Rust code according to style guidelines. Your
+code has to be formatted by `rustfmt` before a PR can be merged. Clippy uses
+nightly `rustfmt` in the CI.
+
+It can be installed via `rustup`:
+
+```bash
+rustup component add rustfmt --toolchain=nightly
+```
+
+Use `cargo dev fmt` to format the whole codebase. Make sure that `rustfmt` is
+installed for the nightly toolchain.
+
+[Rustfmt]: https://github.com/rust-lang/rustfmt
+
+## Debugging
+
+If you want to debug parts of your lint implementation, you can use the [`dbg!`]
+macro anywhere in your code. Running the tests should then include the debug
+output in the `stdout` part.
+
+[`dbg!`]: https://doc.rust-lang.org/std/macro.dbg.html
+
+## PR Checklist
+
+Before submitting your PR make sure you followed all of the basic requirements:
+
+<!-- Sync this with `.github/PULL_REQUEST_TEMPLATE` -->
+
+- \[ ] Followed [lint naming conventions][lint_naming]
+- \[ ] Added passing UI tests (including committed `.stderr` file)
+- \[ ] `cargo test` passes locally
+- \[ ] Executed `cargo dev update_lints`
+- \[ ] Added lint documentation
+- \[ ] Run `cargo dev fmt`
+
+## Adding configuration to a lint
+
+Clippy supports the configuration of lints values using a `clippy.toml` file in
+the workspace directory. Adding a configuration to a lint can be useful for
+thresholds or to constrain some behavior that can be seen as a false positive
+for some users. Adding a configuration is done in the following steps:
+
+1. Adding a new configuration entry to [`clippy_lints::utils::conf`] like this:
+
+ ```rust
+ /// Lint: LINT_NAME.
+ ///
+ /// <The configuration field doc comment>
+ (configuration_ident: Type = DefaultValue),
+ ```
+
+ The doc comment is automatically added to the documentation of the listed
+ lints. The default value will be formatted using the `Debug` implementation
+ of the type.
+2. Adding the configuration value to the lint impl struct:
+ 1. This first requires the definition of a lint impl struct. Lint impl
+ structs are usually generated with the `declare_lint_pass!` macro. This
+ struct needs to be defined manually to add some kind of metadata to it:
+ ```rust
+ // Generated struct definition
+ declare_lint_pass!(StructName => [
+ LINT_NAME
+ ]);
+
+ // New manual definition struct
+ #[derive(Copy, Clone)]
+ pub struct StructName {}
+
+ impl_lint_pass!(StructName => [
+ LINT_NAME
+ ]);
+ ```
+
+ 2. Next add the configuration value and a corresponding creation method like
+ this:
+ ```rust
+ #[derive(Copy, Clone)]
+ pub struct StructName {
+ configuration_ident: Type,
+ }
+
+ // ...
+
+ impl StructName {
+ pub fn new(configuration_ident: Type) -> Self {
+ Self {
+ configuration_ident,
+ }
+ }
+ }
+ ```
+3. Passing the configuration value to the lint impl struct:
+
+ First find the struct construction in the [`clippy_lints` lib file]. The
+ configuration value is now cloned or copied into a local value that is then
+ passed to the impl struct like this:
+
+ ```rust
+ // Default generated registration:
+ store.register_*_pass(|| box module::StructName);
+
+ // New registration with configuration value
+ let configuration_ident = conf.configuration_ident.clone();
+ store.register_*_pass(move || box module::StructName::new(configuration_ident));
+ ```
+
+ Congratulations the work is almost done. The configuration value can now be
+ accessed in the linting code via `self.configuration_ident`.
+
+4. Adding tests:
+ 1. The default configured value can be tested like any normal lint in
+ [`tests/ui`].
+ 2. The configuration itself will be tested separately in [`tests/ui-toml`].
+ Simply add a new subfolder with a fitting name. This folder contains a
+ `clippy.toml` file with the configuration value and a rust file that
+ should be linted by Clippy. The test can otherwise be written as usual.
+
+[`clippy_lints::utils::conf`]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/utils/conf.rs
+[`clippy_lints` lib file]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
+[`tests/ui`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui
+[`tests/ui-toml`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui-toml
+
+## Cheat Sheet
+
+Here are some pointers to things you are likely going to need for every lint:
+
+* [Clippy utils][utils] - Various helper functions. Maybe the function you need
+ is already in here ([`is_type_diagnostic_item`], [`implements_trait`],
+ [`snippet`], etc)
+* [Clippy diagnostics][diagnostics]
+* [Let chains][let-chains]
+* [`from_expansion`][from_expansion] and
+ [`in_external_macro`][in_external_macro]
+* [`Span`][span]
+* [`Applicability`][applicability]
+* [Common tools for writing lints](common_tools_writing_lints.md) helps with
+ common operations
+* [The rustc-dev-guide][rustc-dev-guide] explains a lot of internal compiler
+ concepts
+* [The nightly rustc docs][nightly_docs] which has been linked to throughout
+ this guide
+
+For `EarlyLintPass` lints:
+
+* [`EarlyLintPass`][early_lint_pass]
+* [`rustc_ast::ast`][ast]
+
+For `LateLintPass` lints:
+
+* [`LateLintPass`][late_lint_pass]
+* [`Ty::TyKind`][ty]
+
+While most of Clippy's lint utils are documented, most of rustc's internals lack
+documentation currently. This is unfortunate, but in most cases you can probably
+get away with copying things from existing similar lints. If you are stuck,
+don't hesitate to ask on [Zulip] or in the issue/PR.
+
+[utils]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/index.html
+[`is_type_diagnostic_item`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/ty/fn.is_type_diagnostic_item.html
+[`implements_trait`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/ty/fn.implements_trait.html
+[`snippet`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/source/fn.snippet.html
+[let-chains]: https://github.com/rust-lang/rust/pull/94927
+[from_expansion]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/struct.Span.html#method.from_expansion
+[in_external_macro]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/lint/fn.in_external_macro.html
+[span]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/struct.Span.html
+[applicability]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/enum.Applicability.html
+[rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/
+[nightly_docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/
+[ast]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/index.html
+[ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/sty/index.html
+[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/clippy
--- /dev/null
- For example, this is necessary, if you fix a typo in an error message of a lint
+# Basics for hacking on Clippy
+
+This document explains the basics for hacking on Clippy. Besides others, this
+includes how to build and test Clippy. For a more in depth description on the
+codebase take a look at [Adding Lints] or [Common Tools].
+
+[Adding Lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/adding_lints.md
+[Common Tools]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/common_tools_writing_lints.md
+
+- [Basics for hacking on Clippy](#basics-for-hacking-on-clippy)
+ - [Get the Code](#get-the-code)
+ - [Building and Testing](#building-and-testing)
+ - [`cargo dev`](#cargo-dev)
+ - [lintcheck](#lintcheck)
+ - [PR](#pr)
+ - [Common Abbreviations](#common-abbreviations)
+ - [Install from source](#install-from-source)
+
+## Get the Code
+
+First, make sure you have checked out the latest version of Clippy. If this is
+your first time working on Clippy, create a fork of the repository and clone it
+afterwards with the following command:
+
+```bash
+git clone git@github.com:<your-username>/rust-clippy
+```
+
+If you've already cloned Clippy in the past, update it to the latest version:
+
+```bash
+# If the upstream remote has not been added yet
+git remote add upstream https://github.com/rust-lang/rust-clippy
+# upstream has to be the remote of the rust-lang/rust-clippy repo
+git fetch upstream
+# make sure that you are on the master branch
+git checkout master
+# rebase your master branch on the upstream master
+git rebase upstream/master
+# push to the master branch of your fork
+git push
+```
+
+## Building and Testing
+
+You can build and test Clippy like every other Rust project:
+
+```bash
+cargo build # builds Clippy
+cargo test # tests Clippy
+```
+
+Since Clippy's test suite is pretty big, there are some commands that only run a
+subset of Clippy's tests:
+
+```bash
+# only run UI tests
+cargo uitest
+# only run UI tests starting with `test_`
+TESTNAME="test_" cargo uitest
+# only run dogfood tests
+cargo dev dogfood
+```
+
+If the output of a [UI test] differs from the expected output, you can update
+the reference file with:
+
+```bash
+cargo dev bless
+```
+
- More about intellij command usage and reasons
- [here](https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md#intellij-rust)
++For example, this is necessary if you fix a typo in an error message of a lint,
+or if you modify a test file to add a test case.
+
+> _Note:_ This command may update more files than you intended. In that case
+> only commit the files you wanted to update.
+
+[UI test]: https://rustc-dev-guide.rust-lang.org/tests/adding.html#guide-to-the-ui-tests
+
+## `cargo dev`
+
+Clippy has some dev tools to make working on Clippy more convenient. These tools
+can be accessed through the `cargo dev` command. Available tools are listed
+below. To get more information about these commands, just call them with
+`--help`.
+
+```bash
+# formats the whole Clippy codebase and all tests
+cargo dev fmt
+# register or update lint names/groups/...
+cargo dev update_lints
+# create a new lint and register it
+cargo dev new_lint
+# deprecate a lint and attempt to remove code relating to it
+cargo dev deprecate
+# automatically formatting all code before each commit
+cargo dev setup git-hook
+# (experimental) Setup Clippy to work with IntelliJ-Rust
+cargo dev setup intellij
+# runs the `dogfood` tests
+cargo dev dogfood
+```
+
++More about [intellij] command usage and reasons.
++
++[intellij]: https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md#intellij-rust
+
+## lintcheck
+
+`cargo lintcheck` will build and run clippy on a fixed set of crates and
+generate a log of the results. You can `git diff` the updated log against its
+previous version and see what impact your lint made on a small set of crates.
+If you add a new lint, please audit the resulting warnings and make sure there
+are no false positives and that the suggestions are valid.
+
+Refer to the tools [README] for more details.
+
+[README]: https://github.com/rust-lang/rust-clippy/blob/master/lintcheck/README.md
+
+## PR
+
+We follow a rustc no merge-commit policy. See
+<https://rustc-dev-guide.rust-lang.org/contributing.html#opening-a-pr>.
+
+## Common Abbreviations
+
+| Abbreviation | Meaning |
+| ------------ | -------------------------------------- |
+| UB | Undefined Behavior |
+| FP | False Positive |
+| FN | False Negative |
+| ICE | Internal Compiler Error |
+| AST | Abstract Syntax Tree |
+| MIR | Mid-Level Intermediate Representation |
+| HIR | High-Level Intermediate Representation |
+| TCX | Type context |
+
+This is a concise list of abbreviations that can come up during Clippy
+development. An extensive general list can be found in the [rustc-dev-guide
+glossary][glossary]. Always feel free to ask if an abbreviation or meaning is
+unclear to you.
+
+## Install from source
+
+If you are hacking on Clippy and want to install it from source, do the
+following:
+
+First, take note of the toolchain
+[override](https://rust-lang.github.io/rustup/overrides.html) in
+`/rust-toolchain`. We will use this override to install Clippy into the right
+toolchain.
+
+> Tip: You can view the active toolchain for the current directory with `rustup
+> show active-toolchain`.
+
+From the Clippy project root, run the following command to build the Clippy
+binaries and copy them into the toolchain directory. This will override the
+currently installed Clippy component.
+
+```terminal
+cargo build --release --bin cargo-clippy --bin clippy-driver -Zunstable-options --out-dir "$(rustc --print=sysroot)/bin"
+```
+
+Now you may run `cargo clippy` in any project, using the toolchain where you
+just installed Clippy.
+
+```terminal
+cd my-project
+cargo +nightly-2021-07-01 clippy
+```
+
+...or `clippy-driver`
+
+```terminal
+clippy-driver +nightly-2021-07-01 <filename>
+```
+
+If you need to restore the default Clippy installation, run the following (from
+the Clippy project root).
+
+```terminal
+rustup component remove clippy
+rustup component add clippy
+```
+
+> **DO NOT** install using `cargo install --path . --force` since this will
+> overwrite rustup
+> [proxies](https://rust-lang.github.io/rustup/concepts/proxies.html). That is,
+> `~/.cargo/bin/cargo-clippy` and `~/.cargo/bin/clippy-driver` should be hard or
+> soft links to `~/.cargo/bin/rustup`. You can repair these by running `rustup
+> update`.
+
+[glossary]: https://rustc-dev-guide.rust-lang.org/appendix/glossary.html
--- /dev/null
- .map(|entry| mtime(&entry.path()))
+use std::ffi::OsStr;
+use std::num::ParseIntError;
+use std::path::Path;
+use std::process::Command;
+use std::thread;
+use std::time::{Duration, SystemTime};
+
+/// # Panics
+///
+/// Panics if the python commands could not be spawned
+pub fn run(port: u16, lint: Option<&String>) -> ! {
+ let mut url = Some(match lint {
+ None => format!("http://localhost:{port}"),
+ Some(lint) => format!("http://localhost:{port}/#{lint}"),
+ });
+
+ loop {
+ if mtime("util/gh-pages/lints.json") < mtime("clippy_lints/src") {
+ Command::new("cargo")
+ .arg("collect-metadata")
+ .spawn()
+ .unwrap()
+ .wait()
+ .unwrap();
+ }
+ if let Some(url) = url.take() {
+ thread::spawn(move || {
+ Command::new("python3")
+ .arg("-m")
+ .arg("http.server")
+ .arg(port.to_string())
+ .current_dir("util/gh-pages")
+ .spawn()
+ .unwrap();
+ // Give some time for python to start
+ thread::sleep(Duration::from_millis(500));
+ // Launch browser after first export.py has completed and http.server is up
+ let _result = opener::open(url);
+ });
+ }
+ thread::sleep(Duration::from_millis(1000));
+ }
+}
+
+fn mtime(path: impl AsRef<Path>) -> SystemTime {
+ let path = path.as_ref();
+ if path.is_dir() {
+ path.read_dir()
+ .into_iter()
+ .flatten()
+ .flatten()
++ .map(|entry| mtime(entry.path()))
+ .max()
+ .unwrap_or(SystemTime::UNIX_EPOCH)
+ } else {
+ path.metadata()
+ .and_then(|metadata| metadata.modified())
+ .unwrap_or(SystemTime::UNIX_EPOCH)
+ }
+}
+
+#[allow(clippy::missing_errors_doc)]
+pub fn validate_port(arg: &OsStr) -> Result<(), ParseIntError> {
+ arg.to_string_lossy().parse::<u16>().map(|_| ())
+}
--- /dev/null
- let rustc_source_dir = match check_and_get_rustc_dir(rustc_path) {
- Ok(path) => path,
- Err(_) => return,
+use std::fs;
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::{Path, PathBuf};
+
+// This module takes an absolute path to a rustc repo and alters the dependencies to point towards
+// the respective rustc subcrates instead of using extern crate xyz.
+// This allows IntelliJ to analyze rustc internals and show proper information inside Clippy
+// code. See https://github.com/rust-lang/rust-clippy/issues/5514 for details
+
+const RUSTC_PATH_SECTION: &str = "[target.'cfg(NOT_A_PLATFORM)'.dependencies]";
+const DEPENDENCIES_SECTION: &str = "[dependencies]";
+
+const CLIPPY_PROJECTS: &[ClippyProjectInfo] = &[
+ ClippyProjectInfo::new("root", "Cargo.toml", "src/driver.rs"),
+ ClippyProjectInfo::new("clippy_lints", "clippy_lints/Cargo.toml", "clippy_lints/src/lib.rs"),
+ ClippyProjectInfo::new("clippy_utils", "clippy_utils/Cargo.toml", "clippy_utils/src/lib.rs"),
+];
+
+/// Used to store clippy project information to later inject the dependency into.
+struct ClippyProjectInfo {
+ /// Only used to display information to the user
+ name: &'static str,
+ cargo_file: &'static str,
+ lib_rs_file: &'static str,
+}
+
+impl ClippyProjectInfo {
+ const fn new(name: &'static str, cargo_file: &'static str, lib_rs_file: &'static str) -> Self {
+ Self {
+ name,
+ cargo_file,
+ lib_rs_file,
+ }
+ }
+}
+
+pub fn setup_rustc_src(rustc_path: &str) {
- let mut cargo_content = if let Ok(content) = read_project_file(project.cargo_file) {
- content
- } else {
++ let Ok(rustc_source_dir) = check_and_get_rustc_dir(rustc_path) else {
++ return
+ };
+
+ for project in CLIPPY_PROJECTS {
+ if inject_deps_into_project(&rustc_source_dir, project).is_err() {
+ return;
+ }
+ }
+
+ println!("info: the source paths can be removed again with `cargo dev remove intellij`");
+}
+
+fn check_and_get_rustc_dir(rustc_path: &str) -> Result<PathBuf, ()> {
+ let mut path = PathBuf::from(rustc_path);
+
+ if path.is_relative() {
+ match path.canonicalize() {
+ Ok(absolute_path) => {
+ println!("info: the rustc path was resolved to: `{}`", absolute_path.display());
+ path = absolute_path;
+ },
+ Err(err) => {
+ eprintln!("error: unable to get the absolute path of rustc ({err})");
+ return Err(());
+ },
+ };
+ }
+
+ let path = path.join("compiler");
+ println!("info: looking for compiler sources at: {}", path.display());
+
+ if !path.exists() {
+ eprintln!("error: the given path does not exist");
+ return Err(());
+ }
+
+ if !path.is_dir() {
+ eprintln!("error: the given path is not a directory");
+ return Err(());
+ }
+
+ Ok(path)
+}
+
+fn inject_deps_into_project(rustc_source_dir: &Path, project: &ClippyProjectInfo) -> Result<(), ()> {
+ let cargo_content = read_project_file(project.cargo_file)?;
+ let lib_content = read_project_file(project.lib_rs_file)?;
+
+ if inject_deps_into_manifest(rustc_source_dir, project.cargo_file, &cargo_content, &lib_content).is_err() {
+ eprintln!(
+ "error: unable to inject dependencies into {} with the Cargo file {}",
+ project.name, project.cargo_file
+ );
+ Err(())
+ } else {
+ Ok(())
+ }
+}
+
+/// `clippy_dev` expects to be executed in the root directory of Clippy. This function
+/// loads the given file or returns an error. Having it in this extra function ensures
+/// that the error message looks nice.
+fn read_project_file(file_path: &str) -> Result<String, ()> {
+ let path = Path::new(file_path);
+ if !path.exists() {
+ eprintln!("error: unable to find the file `{file_path}`");
+ return Err(());
+ }
+
+ match fs::read_to_string(path) {
+ Ok(content) => Ok(content),
+ Err(err) => {
+ eprintln!("error: the file `{file_path}` could not be read ({err})");
+ Err(())
+ },
+ }
+}
+
+fn inject_deps_into_manifest(
+ rustc_source_dir: &Path,
+ manifest_path: &str,
+ cargo_toml: &str,
+ lib_rs: &str,
+) -> std::io::Result<()> {
+ // do not inject deps if we have already done so
+ if cargo_toml.contains(RUSTC_PATH_SECTION) {
+ eprintln!("warn: dependencies are already setup inside {manifest_path}, skipping file");
+ return Ok(());
+ }
+
+ let extern_crates = lib_rs
+ .lines()
+ // only take dependencies starting with `rustc_`
+ .filter(|line| line.starts_with("extern crate rustc_"))
+ // we have something like "extern crate foo;", we only care about the "foo"
+ // extern crate rustc_middle;
+ // ^^^^^^^^^^^^
+ .map(|s| &s[13..(s.len() - 1)]);
+
+ let new_deps = extern_crates.map(|dep| {
+ // format the dependencies that are going to be put inside the Cargo.toml
+ format!("{dep} = {{ path = \"{}/{dep}\" }}\n", rustc_source_dir.display())
+ });
+
+ // format a new [dependencies]-block with the new deps we need to inject
+ let mut all_deps = String::from("[target.'cfg(NOT_A_PLATFORM)'.dependencies]\n");
+ new_deps.for_each(|dep_line| {
+ all_deps.push_str(&dep_line);
+ });
+ all_deps.push_str("\n[dependencies]\n");
+
+ // replace "[dependencies]" with
+ // [dependencies]
+ // dep1 = { path = ... }
+ // dep2 = { path = ... }
+ // etc
+ let new_manifest = cargo_toml.replacen("[dependencies]\n", &all_deps, 1);
+
+ // println!("{new_manifest}");
+ let mut file = File::create(manifest_path)?;
+ file.write_all(new_manifest.as_bytes())?;
+
+ println!("info: successfully setup dependencies inside {manifest_path}");
+
+ Ok(())
+}
+
+pub fn remove_rustc_src() {
+ for project in CLIPPY_PROJECTS {
+ remove_rustc_src_from_project(project);
+ }
+}
+
+fn remove_rustc_src_from_project(project: &ClippyProjectInfo) -> bool {
- let section_start = if let Some(section_start) = cargo_content.find(RUSTC_PATH_SECTION) {
- section_start
- } else {
++ let Ok(mut cargo_content) = read_project_file(project.cargo_file) else {
+ return false;
+ };
- let end_point = if let Some(end_point) = cargo_content.find(DEPENDENCIES_SECTION) {
- end_point
- } else {
++ let Some(section_start) = cargo_content.find(RUSTC_PATH_SECTION) else {
+ println!(
+ "info: dependencies could not be found in `{}` for {}, skipping file",
+ project.cargo_file, project.name
+ );
+ return true;
+ };
+
++ let Some(end_point) = cargo_content.find(DEPENDENCIES_SECTION) else {
+ eprintln!(
+ "error: the end of the rustc dependencies section could not be found in `{}`",
+ project.cargo_file
+ );
+ return false;
+ };
+
+ cargo_content.replace_range(section_start..end_point, "");
+
+ match File::create(project.cargo_file) {
+ Ok(mut file) => {
+ file.write_all(cargo_content.as_bytes()).unwrap();
+ println!("info: successfully removed dependencies inside {}", project.cargo_file);
+ true
+ },
+ Err(err) => {
+ eprintln!(
+ "error: unable to open file `{}` to remove rustc dependencies for {} ({err})",
+ project.cargo_file, project.name
+ );
+ false
+ },
+ }
+}
--- /dev/null
- &format!("clippy_lints/src/lib.register_{lint_group}.rs"),
+use crate::clippy_project_root;
+use aho_corasick::AhoCorasickBuilder;
+use indoc::writedoc;
+use itertools::Itertools;
+use rustc_lexer::{tokenize, unescape, LiteralKind, TokenKind};
+use std::collections::{BTreeSet, HashMap, HashSet};
+use std::ffi::OsStr;
+use std::fmt::Write;
+use std::fs::{self, OpenOptions};
+use std::io::{self, Read, Seek, SeekFrom, Write as _};
+use std::ops::Range;
+use std::path::{Path, PathBuf};
+use walkdir::{DirEntry, WalkDir};
+
+const GENERATED_FILE_COMMENT: &str = "// This file was generated by `cargo dev update_lints`.\n\
+ // Use that command to update this file and do not edit by hand.\n\
+ // Manual edits will be overwritten.\n\n";
+
+const DOCS_LINK: &str = "https://rust-lang.github.io/rust-clippy/master/index.html";
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum UpdateMode {
+ Check,
+ Change,
+}
+
+/// Runs the `update_lints` command.
+///
+/// This updates various generated values from the lint source code.
+///
+/// `update_mode` indicates if the files should be updated or if updates should be checked for.
+///
+/// # Panics
+///
+/// Panics if a file path could not read from or then written to
+pub fn update(update_mode: UpdateMode) {
+ let (lints, deprecated_lints, renamed_lints) = gather_all();
+ generate_lint_files(update_mode, &lints, &deprecated_lints, &renamed_lints);
+}
+
+fn generate_lint_files(
+ update_mode: UpdateMode,
+ lints: &[Lint],
+ deprecated_lints: &[DeprecatedLint],
+ renamed_lints: &[RenamedLint],
+) {
+ let internal_lints = Lint::internal_lints(lints);
+ let mut usable_lints = Lint::usable_lints(lints);
+ usable_lints.sort_by_key(|lint| lint.name.clone());
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("README.md"),
+ "[There are over ",
+ " lints included in this crate!]",
+ |res| {
+ write!(res, "{}", round_to_fifty(usable_lints.len())).unwrap();
+ },
+ );
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("book/src/README.md"),
+ "[There are over ",
+ " lints included in this crate!]",
+ |res| {
+ write!(res, "{}", round_to_fifty(usable_lints.len())).unwrap();
+ },
+ );
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("CHANGELOG.md"),
+ "<!-- begin autogenerated links to lint list -->\n",
+ "<!-- end autogenerated links to lint list -->",
+ |res| {
+ for lint in usable_lints
+ .iter()
+ .map(|l| &*l.name)
+ .chain(deprecated_lints.iter().map(|l| &*l.name))
+ .chain(
+ renamed_lints
+ .iter()
+ .map(|l| l.old_name.strip_prefix("clippy::").unwrap_or(&l.old_name)),
+ )
+ .sorted()
+ {
+ writeln!(res, "[`{lint}`]: {DOCS_LINK}#{lint}").unwrap();
+ }
+ },
+ );
+
+ // This has to be in lib.rs, otherwise rustfmt doesn't work
+ replace_region_in_file(
+ update_mode,
+ Path::new("clippy_lints/src/lib.rs"),
+ "// begin lints modules, do not remove this comment, it’s used in `update_lints`\n",
+ "// end lints modules, do not remove this comment, it’s used in `update_lints`",
+ |res| {
+ for lint_mod in usable_lints.iter().map(|l| &l.module).unique().sorted() {
+ writeln!(res, "mod {lint_mod};").unwrap();
+ }
+ },
+ );
+
+ process_file(
+ "clippy_lints/src/lib.register_lints.rs",
+ update_mode,
+ &gen_register_lint_list(internal_lints.iter(), usable_lints.iter()),
+ );
+ process_file(
+ "clippy_lints/src/lib.deprecated.rs",
+ update_mode,
+ &gen_deprecated(deprecated_lints),
+ );
+
+ let all_group_lints = usable_lints.iter().filter(|l| {
+ matches!(
+ &*l.group,
+ "correctness" | "suspicious" | "style" | "complexity" | "perf"
+ )
+ });
+ let content = gen_lint_group_list("all", all_group_lints);
+ process_file("clippy_lints/src/lib.register_all.rs", update_mode, &content);
+
+ update_docs(update_mode, &usable_lints);
+
+ for (lint_group, lints) in Lint::by_lint_group(usable_lints.into_iter().chain(internal_lints)) {
+ let content = gen_lint_group_list(&lint_group, lints.iter());
+ process_file(
- $($(let $capture =)? if let Some(LintDeclSearchResult {
++ format!("clippy_lints/src/lib.register_{lint_group}.rs"),
+ update_mode,
+ &content,
+ );
+ }
+
+ let content = gen_deprecated_lints_test(deprecated_lints);
+ process_file("tests/ui/deprecated.rs", update_mode, &content);
+
+ let content = gen_renamed_lints_test(renamed_lints);
+ process_file("tests/ui/rename.rs", update_mode, &content);
+}
+
+fn update_docs(update_mode: UpdateMode, usable_lints: &[Lint]) {
+ replace_region_in_file(update_mode, Path::new("src/docs.rs"), "docs! {\n", "\n}\n", |res| {
+ for name in usable_lints.iter().map(|lint| lint.name.clone()).sorted() {
+ writeln!(res, r#" "{name}","#).unwrap();
+ }
+ });
+
+ if update_mode == UpdateMode::Check {
+ let mut extra = BTreeSet::new();
+ let mut lint_names = usable_lints
+ .iter()
+ .map(|lint| lint.name.clone())
+ .collect::<BTreeSet<_>>();
+ for file in std::fs::read_dir("src/docs").unwrap() {
+ let filename = file.unwrap().file_name().into_string().unwrap();
+ if let Some(name) = filename.strip_suffix(".txt") {
+ if !lint_names.remove(name) {
+ extra.insert(name.to_string());
+ }
+ }
+ }
+
+ let failed = print_lint_names("extra lint docs:", &extra) | print_lint_names("missing lint docs:", &lint_names);
+
+ if failed {
+ exit_with_failure();
+ }
+ } else {
+ if std::fs::remove_dir_all("src/docs").is_err() {
+ eprintln!("could not remove src/docs directory");
+ }
+ if std::fs::create_dir("src/docs").is_err() {
+ eprintln!("could not recreate src/docs directory");
+ }
+ }
+ for lint in usable_lints {
+ process_file(
+ Path::new("src/docs").join(lint.name.clone() + ".txt"),
+ update_mode,
+ &lint.documentation,
+ );
+ }
+}
+
+fn print_lint_names(header: &str, lints: &BTreeSet<String>) -> bool {
+ if lints.is_empty() {
+ return false;
+ }
+ println!("{header}");
+ for lint in lints.iter().sorted() {
+ println!(" {lint}");
+ }
+ println!();
+ true
+}
+
+pub fn print_lints() {
+ let (lint_list, _, _) = gather_all();
+ let usable_lints = Lint::usable_lints(&lint_list);
+ let usable_lint_count = usable_lints.len();
+ let grouped_by_lint_group = Lint::by_lint_group(usable_lints.into_iter());
+
+ for (lint_group, mut lints) in grouped_by_lint_group {
+ println!("\n## {lint_group}");
+
+ lints.sort_by_key(|l| l.name.clone());
+
+ for lint in lints {
+ println!("* [{}]({DOCS_LINK}#{}) ({})", lint.name, lint.name, lint.desc);
+ }
+ }
+
+ println!("there are {usable_lint_count} lints");
+}
+
+/// Runs the `rename_lint` command.
+///
+/// This does the following:
+/// * Adds an entry to `renamed_lints.rs`.
+/// * Renames all lint attributes to the new name (e.g. `#[allow(clippy::lint_name)]`).
+/// * Renames the lint struct to the new name.
+/// * Renames the module containing the lint struct to the new name if it shares a name with the
+/// lint.
+///
+/// # Panics
+/// Panics for the following conditions:
+/// * If a file path could not read from or then written to
+/// * If either lint name has a prefix
+/// * If `old_name` doesn't name an existing lint.
+/// * If `old_name` names a deprecated or renamed lint.
+#[allow(clippy::too_many_lines)]
+pub fn rename(old_name: &str, new_name: &str, uplift: bool) {
+ if let Some((prefix, _)) = old_name.split_once("::") {
+ panic!("`{old_name}` should not contain the `{prefix}` prefix");
+ }
+ if let Some((prefix, _)) = new_name.split_once("::") {
+ panic!("`{new_name}` should not contain the `{prefix}` prefix");
+ }
+
+ let (mut lints, deprecated_lints, mut renamed_lints) = gather_all();
+ let mut old_lint_index = None;
+ let mut found_new_name = false;
+ for (i, lint) in lints.iter().enumerate() {
+ if lint.name == old_name {
+ old_lint_index = Some(i);
+ } else if lint.name == new_name {
+ found_new_name = true;
+ }
+ }
+ let old_lint_index = old_lint_index.unwrap_or_else(|| panic!("could not find lint `{old_name}`"));
+
+ let lint = RenamedLint {
+ old_name: format!("clippy::{old_name}"),
+ new_name: if uplift {
+ new_name.into()
+ } else {
+ format!("clippy::{new_name}")
+ },
+ };
+
+ // Renamed lints and deprecated lints shouldn't have been found in the lint list, but check just in
+ // case.
+ assert!(
+ !renamed_lints.iter().any(|l| lint.old_name == l.old_name),
+ "`{old_name}` has already been renamed"
+ );
+ assert!(
+ !deprecated_lints.iter().any(|l| lint.old_name == l.name),
+ "`{old_name}` has already been deprecated"
+ );
+
+ // Update all lint level attributes. (`clippy::lint_name`)
+ for file in WalkDir::new(clippy_project_root())
+ .into_iter()
+ .map(Result::unwrap)
+ .filter(|f| {
+ let name = f.path().file_name();
+ let ext = f.path().extension();
+ (ext == Some(OsStr::new("rs")) || ext == Some(OsStr::new("fixed")))
+ && name != Some(OsStr::new("rename.rs"))
+ && name != Some(OsStr::new("renamed_lints.rs"))
+ })
+ {
+ rewrite_file(file.path(), |s| {
+ replace_ident_like(s, &[(&lint.old_name, &lint.new_name)])
+ });
+ }
+
+ renamed_lints.push(lint);
+ renamed_lints.sort_by(|lhs, rhs| {
+ lhs.new_name
+ .starts_with("clippy::")
+ .cmp(&rhs.new_name.starts_with("clippy::"))
+ .reverse()
+ .then_with(|| lhs.old_name.cmp(&rhs.old_name))
+ });
+
+ write_file(
+ Path::new("clippy_lints/src/renamed_lints.rs"),
+ &gen_renamed_lints_list(&renamed_lints),
+ );
+
+ if uplift {
+ write_file(Path::new("tests/ui/rename.rs"), &gen_renamed_lints_test(&renamed_lints));
+ println!(
+ "`{old_name}` has be uplifted. All the code inside `clippy_lints` related to it needs to be removed manually."
+ );
+ } else if found_new_name {
+ write_file(Path::new("tests/ui/rename.rs"), &gen_renamed_lints_test(&renamed_lints));
+ println!(
+ "`{new_name}` is already defined. The old linting code inside `clippy_lints` needs to be updated/removed manually."
+ );
+ } else {
+ // Rename the lint struct and source files sharing a name with the lint.
+ let lint = &mut lints[old_lint_index];
+ let old_name_upper = old_name.to_uppercase();
+ let new_name_upper = new_name.to_uppercase();
+ lint.name = new_name.into();
+
+ // Rename test files. only rename `.stderr` and `.fixed` files if the new test name doesn't exist.
+ if try_rename_file(
+ Path::new(&format!("tests/ui/{old_name}.rs")),
+ Path::new(&format!("tests/ui/{new_name}.rs")),
+ ) {
+ try_rename_file(
+ Path::new(&format!("tests/ui/{old_name}.stderr")),
+ Path::new(&format!("tests/ui/{new_name}.stderr")),
+ );
+ try_rename_file(
+ Path::new(&format!("tests/ui/{old_name}.fixed")),
+ Path::new(&format!("tests/ui/{new_name}.fixed")),
+ );
+ }
+
+ // Try to rename the file containing the lint if the file name matches the lint's name.
+ let replacements;
+ let replacements = if lint.module == old_name
+ && try_rename_file(
+ Path::new(&format!("clippy_lints/src/{old_name}.rs")),
+ Path::new(&format!("clippy_lints/src/{new_name}.rs")),
+ ) {
+ // Edit the module name in the lint list. Note there could be multiple lints.
+ for lint in lints.iter_mut().filter(|l| l.module == old_name) {
+ lint.module = new_name.into();
+ }
+ replacements = [(&*old_name_upper, &*new_name_upper), (old_name, new_name)];
+ replacements.as_slice()
+ } else if !lint.module.contains("::")
+ // Catch cases like `methods/lint_name.rs` where the lint is stored in `methods/mod.rs`
+ && try_rename_file(
+ Path::new(&format!("clippy_lints/src/{}/{old_name}.rs", lint.module)),
+ Path::new(&format!("clippy_lints/src/{}/{new_name}.rs", lint.module)),
+ )
+ {
+ // Edit the module name in the lint list. Note there could be multiple lints, or none.
+ let renamed_mod = format!("{}::{old_name}", lint.module);
+ for lint in lints.iter_mut().filter(|l| l.module == renamed_mod) {
+ lint.module = format!("{}::{new_name}", lint.module);
+ }
+ replacements = [(&*old_name_upper, &*new_name_upper), (old_name, new_name)];
+ replacements.as_slice()
+ } else {
+ replacements = [(&*old_name_upper, &*new_name_upper), ("", "")];
+ &replacements[0..1]
+ };
+
+ // Don't change `clippy_utils/src/renamed_lints.rs` here as it would try to edit the lint being
+ // renamed.
+ for (_, file) in clippy_lints_src_files().filter(|(rel_path, _)| rel_path != OsStr::new("renamed_lints.rs")) {
+ rewrite_file(file.path(), |s| replace_ident_like(s, replacements));
+ }
+
+ generate_lint_files(UpdateMode::Change, &lints, &deprecated_lints, &renamed_lints);
+ println!("{old_name} has been successfully renamed");
+ }
+
+ println!("note: `cargo uitest` still needs to be run to update the test results");
+}
+
+const DEFAULT_DEPRECATION_REASON: &str = "default deprecation note";
+/// Runs the `deprecate` command
+///
+/// This does the following:
+/// * Adds an entry to `deprecated_lints.rs`.
+/// * Removes the lint declaration (and the entire file if applicable)
+///
+/// # Panics
+///
+/// If a file path could not read from or written to
+pub fn deprecate(name: &str, reason: Option<&String>) {
+ fn finish(
+ (lints, mut deprecated_lints, renamed_lints): (Vec<Lint>, Vec<DeprecatedLint>, Vec<RenamedLint>),
+ name: &str,
+ reason: &str,
+ ) {
+ deprecated_lints.push(DeprecatedLint {
+ name: name.to_string(),
+ reason: reason.to_string(),
+ declaration_range: Range::default(),
+ });
+
+ generate_lint_files(UpdateMode::Change, &lints, &deprecated_lints, &renamed_lints);
+ println!("info: `{name}` has successfully been deprecated");
+
+ if reason == DEFAULT_DEPRECATION_REASON {
+ println!("note: the deprecation reason must be updated in `clippy_lints/src/deprecated_lints.rs`");
+ }
+ println!("note: you must run `cargo uitest` to update the test results");
+ }
+
+ let reason = reason.map_or(DEFAULT_DEPRECATION_REASON, String::as_str);
+ let name_lower = name.to_lowercase();
+ let name_upper = name.to_uppercase();
+
+ let (mut lints, deprecated_lints, renamed_lints) = gather_all();
+ let Some(lint) = lints.iter().find(|l| l.name == name_lower) else { eprintln!("error: failed to find lint `{name}`"); return; };
+
+ let mod_path = {
+ let mut mod_path = PathBuf::from(format!("clippy_lints/src/{}", lint.module));
+ if mod_path.is_dir() {
+ mod_path = mod_path.join("mod");
+ }
+
+ mod_path.set_extension("rs");
+ mod_path
+ };
+
+ let deprecated_lints_path = &*clippy_project_root().join("clippy_lints/src/deprecated_lints.rs");
+
+ if remove_lint_declaration(&name_lower, &mod_path, &mut lints).unwrap_or(false) {
+ declare_deprecated(&name_upper, deprecated_lints_path, reason).unwrap();
+ finish((lints, deprecated_lints, renamed_lints), name, reason);
+ return;
+ }
+
+ eprintln!("error: lint not found");
+}
+
+fn remove_lint_declaration(name: &str, path: &Path, lints: &mut Vec<Lint>) -> io::Result<bool> {
+ fn remove_lint(name: &str, lints: &mut Vec<Lint>) {
+ lints.iter().position(|l| l.name == name).map(|pos| lints.remove(pos));
+ }
+
+ fn remove_test_assets(name: &str) {
+ let test_file_stem = format!("tests/ui/{name}");
+ let path = Path::new(&test_file_stem);
+
+ // Some lints have their own directories, delete them
+ if path.is_dir() {
+ fs::remove_dir_all(path).ok();
+ return;
+ }
+
+ // Remove all related test files
+ fs::remove_file(path.with_extension("rs")).ok();
+ fs::remove_file(path.with_extension("stderr")).ok();
+ fs::remove_file(path.with_extension("fixed")).ok();
+ }
+
+ fn remove_impl_lint_pass(lint_name_upper: &str, content: &mut String) {
+ let impl_lint_pass_start = content.find("impl_lint_pass!").unwrap_or_else(|| {
+ content
+ .find("declare_lint_pass!")
+ .unwrap_or_else(|| panic!("failed to find `impl_lint_pass`"))
+ });
+ let mut impl_lint_pass_end = content[impl_lint_pass_start..]
+ .find(']')
+ .expect("failed to find `impl_lint_pass` terminator");
+
+ impl_lint_pass_end += impl_lint_pass_start;
+ if let Some(lint_name_pos) = content[impl_lint_pass_start..impl_lint_pass_end].find(lint_name_upper) {
+ let mut lint_name_end = impl_lint_pass_start + (lint_name_pos + lint_name_upper.len());
+ for c in content[lint_name_end..impl_lint_pass_end].chars() {
+ // Remove trailing whitespace
+ if c == ',' || c.is_whitespace() {
+ lint_name_end += 1;
+ } else {
+ break;
+ }
+ }
+
+ content.replace_range(impl_lint_pass_start + lint_name_pos..lint_name_end, "");
+ }
+ }
+
+ if path.exists() {
+ if let Some(lint) = lints.iter().find(|l| l.name == name) {
+ if lint.module == name {
+ // The lint name is the same as the file, we can just delete the entire file
+ fs::remove_file(path)?;
+ } else {
+ // We can't delete the entire file, just remove the declaration
+
+ if let Some(Some("mod.rs")) = path.file_name().map(OsStr::to_str) {
+ // Remove clippy_lints/src/some_mod/some_lint.rs
+ let mut lint_mod_path = path.to_path_buf();
+ lint_mod_path.set_file_name(name);
+ lint_mod_path.set_extension("rs");
+
+ fs::remove_file(lint_mod_path).ok();
+ }
+
+ let mut content =
+ fs::read_to_string(path).unwrap_or_else(|_| panic!("failed to read `{}`", path.to_string_lossy()));
+
+ eprintln!(
+ "warn: you will have to manually remove any code related to `{name}` from `{}`",
+ path.display()
+ );
+
+ assert!(
+ content[lint.declaration_range.clone()].contains(&name.to_uppercase()),
+ "error: `{}` does not contain lint `{}`'s declaration",
+ path.display(),
+ lint.name
+ );
+
+ // Remove lint declaration (declare_clippy_lint!)
+ content.replace_range(lint.declaration_range.clone(), "");
+
+ // Remove the module declaration (mod xyz;)
+ let mod_decl = format!("\nmod {name};");
+ content = content.replacen(&mod_decl, "", 1);
+
+ remove_impl_lint_pass(&lint.name.to_uppercase(), &mut content);
+ fs::write(path, content).unwrap_or_else(|_| panic!("failed to write to `{}`", path.to_string_lossy()));
+ }
+
+ remove_test_assets(name);
+ remove_lint(name, lints);
+ return Ok(true);
+ }
+ }
+
+ Ok(false)
+}
+
+fn declare_deprecated(name: &str, path: &Path, reason: &str) -> io::Result<()> {
+ let mut file = OpenOptions::new().write(true).open(path)?;
+
+ file.seek(SeekFrom::End(0))?;
+
+ let version = crate::new_lint::get_stabilization_version();
+ let deprecation_reason = if reason == DEFAULT_DEPRECATION_REASON {
+ "TODO"
+ } else {
+ reason
+ };
+
+ writedoc!(
+ file,
+ "
+
+ declare_deprecated_lint! {{
+ /// ### What it does
+ /// Nothing. This lint has been deprecated.
+ ///
+ /// ### Deprecation reason
+ /// {}
+ #[clippy::version = \"{}\"]
+ pub {},
+ \"{}\"
+ }}
+
+ ",
+ deprecation_reason,
+ version,
+ name,
+ reason,
+ )
+}
+
+/// Replace substrings if they aren't bordered by identifier characters. Returns `None` if there
+/// were no replacements.
+fn replace_ident_like(contents: &str, replacements: &[(&str, &str)]) -> Option<String> {
+ fn is_ident_char(c: u8) -> bool {
+ matches!(c, b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9' | b'_')
+ }
+
+ let searcher = AhoCorasickBuilder::new()
+ .dfa(true)
+ .match_kind(aho_corasick::MatchKind::LeftmostLongest)
+ .build_with_size::<u16, _, _>(replacements.iter().map(|&(x, _)| x.as_bytes()))
+ .unwrap();
+
+ let mut result = String::with_capacity(contents.len() + 1024);
+ let mut pos = 0;
+ let mut edited = false;
+ for m in searcher.find_iter(contents) {
+ let (old, new) = replacements[m.pattern()];
+ result.push_str(&contents[pos..m.start()]);
+ result.push_str(
+ if !is_ident_char(contents.as_bytes().get(m.start().wrapping_sub(1)).copied().unwrap_or(0))
+ && !is_ident_char(contents.as_bytes().get(m.end()).copied().unwrap_or(0))
+ {
+ edited = true;
+ new
+ } else {
+ old
+ },
+ );
+ pos = m.end();
+ }
+ result.push_str(&contents[pos..]);
+ edited.then_some(result)
+}
+
+fn round_to_fifty(count: usize) -> usize {
+ count / 50 * 50
+}
+
+fn process_file(path: impl AsRef<Path>, update_mode: UpdateMode, content: &str) {
+ if update_mode == UpdateMode::Check {
+ let old_content =
+ fs::read_to_string(&path).unwrap_or_else(|e| panic!("Cannot read from {}: {e}", path.as_ref().display()));
+ if content != old_content {
+ exit_with_failure();
+ }
+ } else {
+ fs::write(&path, content.as_bytes())
+ .unwrap_or_else(|e| panic!("Cannot write to {}: {e}", path.as_ref().display()));
+ }
+}
+
+fn exit_with_failure() {
+ println!(
+ "Not all lints defined properly. \
+ Please run `cargo dev update_lints` to make sure all lints are defined properly."
+ );
+ std::process::exit(1);
+}
+
+/// Lint data parsed from the Clippy source code.
+#[derive(Clone, PartialEq, Eq, Debug)]
+struct Lint {
+ name: String,
+ group: String,
+ desc: String,
+ module: String,
+ declaration_range: Range<usize>,
+ documentation: String,
+}
+
+impl Lint {
+ #[must_use]
+ fn new(
+ name: &str,
+ group: &str,
+ desc: &str,
+ module: &str,
+ declaration_range: Range<usize>,
+ documentation: String,
+ ) -> Self {
+ Self {
+ name: name.to_lowercase(),
+ group: group.into(),
+ desc: remove_line_splices(desc),
+ module: module.into(),
+ declaration_range,
+ documentation,
+ }
+ }
+
+ /// Returns all non-deprecated lints and non-internal lints
+ #[must_use]
+ fn usable_lints(lints: &[Self]) -> Vec<Self> {
+ lints
+ .iter()
+ .filter(|l| !l.group.starts_with("internal"))
+ .cloned()
+ .collect()
+ }
+
+ /// Returns all internal lints (not `internal_warn` lints)
+ #[must_use]
+ fn internal_lints(lints: &[Self]) -> Vec<Self> {
+ lints.iter().filter(|l| l.group == "internal").cloned().collect()
+ }
+
+ /// Returns the lints in a `HashMap`, grouped by the different lint groups
+ #[must_use]
+ fn by_lint_group(lints: impl Iterator<Item = Self>) -> HashMap<String, Vec<Self>> {
+ lints.map(|lint| (lint.group.to_string(), lint)).into_group_map()
+ }
+}
+
+#[derive(Clone, PartialEq, Eq, Debug)]
+struct DeprecatedLint {
+ name: String,
+ reason: String,
+ declaration_range: Range<usize>,
+}
+impl DeprecatedLint {
+ fn new(name: &str, reason: &str, declaration_range: Range<usize>) -> Self {
+ Self {
+ name: name.to_lowercase(),
+ reason: remove_line_splices(reason),
+ declaration_range,
+ }
+ }
+}
+
+struct RenamedLint {
+ old_name: String,
+ new_name: String,
+}
+impl RenamedLint {
+ fn new(old_name: &str, new_name: &str) -> Self {
+ Self {
+ old_name: remove_line_splices(old_name),
+ new_name: remove_line_splices(new_name),
+ }
+ }
+}
+
+/// Generates the code for registering a group
+fn gen_lint_group_list<'a>(group_name: &str, lints: impl Iterator<Item = &'a Lint>) -> String {
+ let mut details: Vec<_> = lints.map(|l| (&l.module, l.name.to_uppercase())).collect();
+ details.sort_unstable();
+
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+
+ let _ = writeln!(
+ output,
+ "store.register_group(true, \"clippy::{group_name}\", Some(\"clippy_{group_name}\"), vec![",
+ );
+ for (module, name) in details {
+ let _ = writeln!(output, " LintId::of({module}::{name}),");
+ }
+ output.push_str("])\n");
+
+ output
+}
+
+/// Generates the `register_removed` code
+#[must_use]
+fn gen_deprecated(lints: &[DeprecatedLint]) -> String {
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+ output.push_str("{\n");
+ for lint in lints {
+ let _ = write!(
+ output,
+ concat!(
+ " store.register_removed(\n",
+ " \"clippy::{}\",\n",
+ " \"{}\",\n",
+ " );\n"
+ ),
+ lint.name, lint.reason,
+ );
+ }
+ output.push_str("}\n");
+
+ output
+}
+
+/// Generates the code for registering lints
+#[must_use]
+fn gen_register_lint_list<'a>(
+ internal_lints: impl Iterator<Item = &'a Lint>,
+ usable_lints: impl Iterator<Item = &'a Lint>,
+) -> String {
+ let mut details: Vec<_> = internal_lints
+ .map(|l| (false, &l.module, l.name.to_uppercase()))
+ .chain(usable_lints.map(|l| (true, &l.module, l.name.to_uppercase())))
+ .collect();
+ details.sort_unstable();
+
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+ output.push_str("store.register_lints(&[\n");
+
+ for (is_public, module_name, lint_name) in details {
+ if !is_public {
+ output.push_str(" #[cfg(feature = \"internal\")]\n");
+ }
+ let _ = writeln!(output, " {module_name}::{lint_name},");
+ }
+ output.push_str("])\n");
+
+ output
+}
+
+fn gen_deprecated_lints_test(lints: &[DeprecatedLint]) -> String {
+ let mut res: String = GENERATED_FILE_COMMENT.into();
+ for lint in lints {
+ writeln!(res, "#![warn(clippy::{})]", lint.name).unwrap();
+ }
+ res.push_str("\nfn main() {}\n");
+ res
+}
+
+fn gen_renamed_lints_test(lints: &[RenamedLint]) -> String {
+ let mut seen_lints = HashSet::new();
+ let mut res: String = GENERATED_FILE_COMMENT.into();
+ res.push_str("// run-rustfix\n\n");
+ for lint in lints {
+ if seen_lints.insert(&lint.new_name) {
+ writeln!(res, "#![allow({})]", lint.new_name).unwrap();
+ }
+ }
+ seen_lints.clear();
+ for lint in lints {
+ if seen_lints.insert(&lint.old_name) {
+ writeln!(res, "#![warn({})]", lint.old_name).unwrap();
+ }
+ }
+ res.push_str("\nfn main() {}\n");
+ res
+}
+
+fn gen_renamed_lints_list(lints: &[RenamedLint]) -> String {
+ const HEADER: &str = "\
+ // This file is managed by `cargo dev rename_lint`. Prefer using that when possible.\n\n\
+ #[rustfmt::skip]\n\
+ pub static RENAMED_LINTS: &[(&str, &str)] = &[\n";
+
+ let mut res = String::from(HEADER);
+ for lint in lints {
+ writeln!(res, " (\"{}\", \"{}\"),", lint.old_name, lint.new_name).unwrap();
+ }
+ res.push_str("];\n");
+ res
+}
+
+/// Gathers all lints defined in `clippy_lints/src`
+fn gather_all() -> (Vec<Lint>, Vec<DeprecatedLint>, Vec<RenamedLint>) {
+ let mut lints = Vec::with_capacity(1000);
+ let mut deprecated_lints = Vec::with_capacity(50);
+ let mut renamed_lints = Vec::with_capacity(50);
+
+ for (rel_path, file) in clippy_lints_src_files() {
+ let path = file.path();
+ let contents =
+ fs::read_to_string(path).unwrap_or_else(|e| panic!("Cannot read from `{}`: {e}", path.display()));
+ let module = rel_path
+ .components()
+ .map(|c| c.as_os_str().to_str().unwrap())
+ .collect::<Vec<_>>()
+ .join("::");
+
+ // If the lints are stored in mod.rs, we get the module name from
+ // the containing directory:
+ let module = if let Some(module) = module.strip_suffix("::mod.rs") {
+ module
+ } else {
+ module.strip_suffix(".rs").unwrap_or(&module)
+ };
+
+ match module {
+ "deprecated_lints" => parse_deprecated_contents(&contents, &mut deprecated_lints),
+ "renamed_lints" => parse_renamed_contents(&contents, &mut renamed_lints),
+ _ => parse_contents(&contents, module, &mut lints),
+ }
+ }
+ (lints, deprecated_lints, renamed_lints)
+}
+
+fn clippy_lints_src_files() -> impl Iterator<Item = (PathBuf, DirEntry)> {
+ let root_path = clippy_project_root().join("clippy_lints/src");
+ let iter = WalkDir::new(&root_path).into_iter();
+ iter.map(Result::unwrap)
+ .filter(|f| f.path().extension() == Some(OsStr::new("rs")))
+ .map(move |f| (f.path().strip_prefix(&root_path).unwrap().to_path_buf(), f))
+}
+
+macro_rules! match_tokens {
+ ($iter:ident, $($token:ident $({$($fields:tt)*})? $(($capture:ident))?)*) => {
+ {
- content: _x,
++ $(#[allow(clippy::redundant_pattern)] let Some(LintDeclSearchResult {
+ token_kind: TokenKind::$token $({$($fields)*})?,
- }) = $iter.next() {
- _x
- } else {
++ content: $($capture @)? _,
+ ..
++ }) = $iter.next() else {
+ continue;
+ };)*
+ #[allow(clippy::unused_unit)]
+ { ($($($capture,)?)*) }
+ }
+ }
+}
+
+pub(crate) use match_tokens;
+
+pub(crate) struct LintDeclSearchResult<'a> {
+ pub token_kind: TokenKind,
+ pub content: &'a str,
+ pub range: Range<usize>,
+}
+
+/// Parse a source file looking for `declare_clippy_lint` macro invocations.
+fn parse_contents(contents: &str, module: &str, lints: &mut Vec<Lint>) {
+ let mut offset = 0usize;
+ let mut iter = tokenize(contents).map(|t| {
+ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_clippy_lint",
+ ) {
+ let start = range.start;
+ let mut docs = String::with_capacity(128);
+ let mut iter = iter.by_ref().filter(|t| !matches!(t.token_kind, TokenKind::Whitespace));
+ // matches `!{`
+ match_tokens!(iter, Bang OpenBrace);
+ let mut in_code = false;
+ while let Some(t) = iter.next() {
+ match t.token_kind {
+ TokenKind::LineComment { .. } => {
+ if let Some(line) = t.content.strip_prefix("/// ").or_else(|| t.content.strip_prefix("///")) {
+ if line.starts_with("```") {
+ docs += "```\n";
+ in_code = !in_code;
+ } else if !(in_code && line.starts_with("# ")) {
+ docs += line;
+ docs.push('\n');
+ }
+ }
+ },
+ TokenKind::Pound => {
+ match_tokens!(iter, OpenBracket Ident Colon Colon Ident Eq Literal{..} CloseBracket Ident);
+ break;
+ },
+ TokenKind::Ident => {
+ break;
+ },
+ _ => {},
+ }
+ }
+ docs.pop(); // remove final newline
+
+ let (name, group, desc) = match_tokens!(
+ iter,
+ // LINT_NAME
+ Ident(name) Comma
+ // group,
+ Ident(group) Comma
+ // "description"
+ Literal{..}(desc)
+ );
+
+ if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::CloseBrace,
+ range,
+ ..
+ }) = iter.next()
+ {
+ lints.push(Lint::new(name, group, desc, module, start..range.end, docs));
+ }
+ }
+}
+
+/// Parse a source file looking for `declare_deprecated_lint` macro invocations.
+fn parse_deprecated_contents(contents: &str, lints: &mut Vec<DeprecatedLint>) {
+ let mut offset = 0usize;
+ let mut iter = tokenize(contents).map(|t| {
+ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_deprecated_lint",
+ ) {
+ let start = range.start;
+
+ let mut iter = iter.by_ref().filter(|LintDeclSearchResult { ref token_kind, .. }| {
+ !matches!(token_kind, TokenKind::Whitespace | TokenKind::LineComment { .. })
+ });
+ let (name, reason) = match_tokens!(
+ iter,
+ // !{
+ Bang OpenBrace
+ // #[clippy::version = "version"]
+ Pound OpenBracket Ident Colon Colon Ident Eq Literal{..} CloseBracket
+ // pub LINT_NAME,
+ Ident Ident(name) Comma
+ // "description"
+ Literal{kind: LiteralKind::Str{..},..}(reason)
+ );
+
+ if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::CloseBrace,
+ range,
+ ..
+ }) = iter.next()
+ {
+ lints.push(DeprecatedLint::new(name, reason, start..range.end));
+ }
+ }
+}
+
+fn parse_renamed_contents(contents: &str, lints: &mut Vec<RenamedLint>) {
+ for line in contents.lines() {
+ let mut offset = 0usize;
+ let mut iter = tokenize(line).map(|t| {
+ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &line[range.clone()],
+ range,
+ }
+ });
+
+ let (old_name, new_name) = match_tokens!(
+ iter,
+ // ("old_name",
+ Whitespace OpenParen Literal{kind: LiteralKind::Str{..},..}(old_name) Comma
+ // "new_name"),
+ Whitespace Literal{kind: LiteralKind::Str{..},..}(new_name) CloseParen Comma
+ );
+ lints.push(RenamedLint::new(old_name, new_name));
+ }
+}
+
+/// Removes the line splices and surrounding quotes from a string literal
+fn remove_line_splices(s: &str) -> String {
+ let s = s
+ .strip_prefix('r')
+ .unwrap_or(s)
+ .trim_matches('#')
+ .strip_prefix('"')
+ .and_then(|s| s.strip_suffix('"'))
+ .unwrap_or_else(|| panic!("expected quoted string, found `{s}`"));
+ let mut res = String::with_capacity(s.len());
+ unescape::unescape_literal(s, unescape::Mode::Str, &mut |range, ch| {
+ if ch.is_ok() {
+ res.push_str(&s[range]);
+ }
+ });
+ res
+}
+
+/// Replaces a region in a file delimited by two lines matching regexes.
+///
+/// `path` is the relative path to the file on which you want to perform the replacement.
+///
+/// See `replace_region_in_text` for documentation of the other options.
+///
+/// # Panics
+///
+/// Panics if the path could not read or then written
+fn replace_region_in_file(
+ update_mode: UpdateMode,
+ path: &Path,
+ start: &str,
+ end: &str,
+ write_replacement: impl FnMut(&mut String),
+) {
+ let contents = fs::read_to_string(path).unwrap_or_else(|e| panic!("Cannot read from `{}`: {e}", path.display()));
+ let new_contents = match replace_region_in_text(&contents, start, end, write_replacement) {
+ Ok(x) => x,
+ Err(delim) => panic!("Couldn't find `{delim}` in file `{}`", path.display()),
+ };
+
+ match update_mode {
+ UpdateMode::Check if contents != new_contents => exit_with_failure(),
+ UpdateMode::Check => (),
+ UpdateMode::Change => {
+ if let Err(e) = fs::write(path, new_contents.as_bytes()) {
+ panic!("Cannot write to `{}`: {e}", path.display());
+ }
+ },
+ }
+}
+
+/// Replaces a region in a text delimited by two strings. Returns the new text if both delimiters
+/// were found, or the missing delimiter if not.
+fn replace_region_in_text<'a>(
+ text: &str,
+ start: &'a str,
+ end: &'a str,
+ mut write_replacement: impl FnMut(&mut String),
+) -> Result<String, &'a str> {
+ let (text_start, rest) = text.split_once(start).ok_or(start)?;
+ let (_, text_end) = rest.split_once(end).ok_or(end)?;
+
+ let mut res = String::with_capacity(text.len() + 4096);
+ res.push_str(text_start);
+ res.push_str(start);
+ write_replacement(&mut res);
+ res.push_str(end);
+ res.push_str(text_end);
+
+ Ok(res)
+}
+
+fn try_rename_file(old_name: &Path, new_name: &Path) -> bool {
+ match fs::OpenOptions::new().create_new(true).write(true).open(new_name) {
+ Ok(file) => drop(file),
+ Err(e) if matches!(e.kind(), io::ErrorKind::AlreadyExists | io::ErrorKind::NotFound) => return false,
+ Err(e) => panic_file(e, new_name, "create"),
+ };
+ match fs::rename(old_name, new_name) {
+ Ok(()) => true,
+ Err(e) => {
+ drop(fs::remove_file(new_name));
+ if e.kind() == io::ErrorKind::NotFound {
+ false
+ } else {
+ panic_file(e, old_name, "rename");
+ }
+ },
+ }
+}
+
+#[allow(clippy::needless_pass_by_value)]
+fn panic_file(error: io::Error, name: &Path, action: &str) -> ! {
+ panic!("failed to {action} file `{}`: {error}", name.display())
+}
+
+fn rewrite_file(path: &Path, f: impl FnOnce(&str) -> Option<String>) {
+ let mut file = fs::OpenOptions::new()
+ .write(true)
+ .read(true)
+ .open(path)
+ .unwrap_or_else(|e| panic_file(e, path, "open"));
+ let mut buf = String::new();
+ file.read_to_string(&mut buf)
+ .unwrap_or_else(|e| panic_file(e, path, "read"));
+ if let Some(new_contents) = f(&buf) {
+ file.rewind().unwrap_or_else(|e| panic_file(e, path, "write"));
+ file.write_all(new_contents.as_bytes())
+ .unwrap_or_else(|e| panic_file(e, path, "write"));
+ file.set_len(new_contents.len() as u64)
+ .unwrap_or_else(|e| panic_file(e, path, "write"));
+ }
+}
+
+fn write_file(path: &Path, contents: &str) {
+ fs::write(path, contents).unwrap_or_else(|e| panic_file(e, path, "write"));
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_parse_contents() {
+ static CONTENTS: &str = r#"
+ declare_clippy_lint! {
+ #[clippy::version = "Hello Clippy!"]
+ pub PTR_ARG,
+ style,
+ "really long \
+ text"
+ }
+
+ declare_clippy_lint!{
+ #[clippy::version = "Test version"]
+ pub DOC_MARKDOWN,
+ pedantic,
+ "single line"
+ }
+ "#;
+ let mut result = Vec::new();
+ parse_contents(CONTENTS, "module_name", &mut result);
+ for r in &mut result {
+ r.declaration_range = Range::default();
+ }
+
+ let expected = vec![
+ Lint::new(
+ "ptr_arg",
+ "style",
+ "\"really long text\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "doc_markdown",
+ "pedantic",
+ "\"single line\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ ];
+ assert_eq!(expected, result);
+ }
+
+ #[test]
+ fn test_parse_deprecated_contents() {
+ static DEPRECATED_CONTENTS: &str = r#"
+ /// some doc comment
+ declare_deprecated_lint! {
+ #[clippy::version = "I'm a version"]
+ pub SHOULD_ASSERT_EQ,
+ "`assert!()` will be more flexible with RFC 2011"
+ }
+ "#;
+
+ let mut result = Vec::new();
+ parse_deprecated_contents(DEPRECATED_CONTENTS, &mut result);
+ for r in &mut result {
+ r.declaration_range = Range::default();
+ }
+
+ let expected = vec![DeprecatedLint::new(
+ "should_assert_eq",
+ "\"`assert!()` will be more flexible with RFC 2011\"",
+ Range::default(),
+ )];
+ assert_eq!(expected, result);
+ }
+
+ #[test]
+ fn test_usable_lints() {
+ let lints = vec![
+ Lint::new(
+ "should_assert_eq2",
+ "Not Deprecated",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "should_assert_eq2",
+ "internal",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "should_assert_eq2",
+ "internal_style",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ ];
+ let expected = vec![Lint::new(
+ "should_assert_eq2",
+ "Not Deprecated",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ )];
+ assert_eq!(expected, Lint::usable_lints(&lints));
+ }
+
+ #[test]
+ fn test_by_lint_group() {
+ let lints = vec![
+ Lint::new(
+ "should_assert_eq",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "should_assert_eq2",
+ "group2",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "incorrect_match",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ ];
+ let mut expected: HashMap<String, Vec<Lint>> = HashMap::new();
+ expected.insert(
+ "group1".to_string(),
+ vec![
+ Lint::new(
+ "should_assert_eq",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "incorrect_match",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ ],
+ );
+ expected.insert(
+ "group2".to_string(),
+ vec![Lint::new(
+ "should_assert_eq2",
+ "group2",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ )],
+ );
+ assert_eq!(expected, Lint::by_lint_group(lints.into_iter()));
+ }
+
+ #[test]
+ fn test_gen_deprecated() {
+ let lints = vec![
+ DeprecatedLint::new(
+ "should_assert_eq",
+ "\"has been superseded by should_assert_eq2\"",
+ Range::default(),
+ ),
+ DeprecatedLint::new("another_deprecated", "\"will be removed\"", Range::default()),
+ ];
+
+ let expected = GENERATED_FILE_COMMENT.to_string()
+ + &[
+ "{",
+ " store.register_removed(",
+ " \"clippy::should_assert_eq\",",
+ " \"has been superseded by should_assert_eq2\",",
+ " );",
+ " store.register_removed(",
+ " \"clippy::another_deprecated\",",
+ " \"will be removed\",",
+ " );",
+ "}",
+ ]
+ .join("\n")
+ + "\n";
+
+ assert_eq!(expected, gen_deprecated(&lints));
+ }
+
+ #[test]
+ fn test_gen_lint_group_list() {
+ let lints = vec![
+ Lint::new(
+ "abc",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "should_assert_eq",
+ "group1",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ Lint::new(
+ "internal",
+ "internal_style",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ String::new(),
+ ),
+ ];
+ let expected = GENERATED_FILE_COMMENT.to_string()
+ + &[
+ "store.register_group(true, \"clippy::group1\", Some(\"clippy_group1\"), vec![",
+ " LintId::of(module_name::ABC),",
+ " LintId::of(module_name::INTERNAL),",
+ " LintId::of(module_name::SHOULD_ASSERT_EQ),",
+ "])",
+ ]
+ .join("\n")
+ + "\n";
+
+ let result = gen_lint_group_list("group1", lints.iter());
+
+ assert_eq!(expected, result);
+ }
+}
--- /dev/null
- use clippy_utils::{eq_expr_value, get_trait_def_id, paths};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
++use clippy_utils::eq_expr_value;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
- get_trait_def_id(cx, &paths::ORD).map_or(false, |id| implements_trait(cx, ty, id, &[]))
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for boolean expressions that can be written more
+ /// concisely.
+ ///
+ /// ### Why is this bad?
+ /// Readability of boolean expressions suffers from
+ /// unnecessary duplication.
+ ///
+ /// ### Known problems
+ /// Ignores short circuiting behavior of `||` and
+ /// `&&`. Ignores `|`, `&` and `^`.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if a && true {}
+ /// if !(a == b) {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// if a {}
+ /// if a != b {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NONMINIMAL_BOOL,
+ complexity,
+ "boolean expressions that can be written more concisely"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for boolean expressions that contain terminals that
+ /// can be eliminated.
+ ///
+ /// ### Why is this bad?
+ /// This is most likely a logic bug.
+ ///
+ /// ### Known problems
+ /// Ignores short circuiting behavior.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // The `b` is unnecessary, the expression is equivalent to `if a`.
+ /// if a && b || a { ... }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// if a {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OVERLY_COMPLEX_BOOL_EXPR,
+ correctness,
+ "boolean expressions that contain terminals which can be eliminated"
+}
+
+// For each pairs, both orders are considered.
+const METHODS_WITH_NEGATION: [(&str, &str); 2] = [("is_some", "is_none"), ("is_err", "is_ok")];
+
+declare_lint_pass!(NonminimalBool => [NONMINIMAL_BOOL, OVERLY_COMPLEX_BOOL_EXPR]);
+
+impl<'tcx> LateLintPass<'tcx> for NonminimalBool {
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ _: FnKind<'tcx>,
+ _: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ _: Span,
+ _: HirId,
+ ) {
+ NonminimalBoolVisitor { cx }.visit_body(body);
+ }
+}
+
+struct NonminimalBoolVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+}
+
+use quine_mc_cluskey::Bool;
+struct Hir2Qmm<'a, 'tcx, 'v> {
+ terminals: Vec<&'v Expr<'v>>,
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
+ fn extract(&mut self, op: BinOpKind, a: &[&'v Expr<'_>], mut v: Vec<Bool>) -> Result<Vec<Bool>, String> {
+ for a in a {
+ if let ExprKind::Binary(binop, lhs, rhs) = &a.kind {
+ if binop.node == op {
+ v = self.extract(op, &[lhs, rhs], v)?;
+ continue;
+ }
+ }
+ v.push(self.run(a)?);
+ }
+ Ok(v)
+ }
+
+ fn run(&mut self, e: &'v Expr<'_>) -> Result<Bool, String> {
+ fn negate(bin_op_kind: BinOpKind) -> Option<BinOpKind> {
+ match bin_op_kind {
+ BinOpKind::Eq => Some(BinOpKind::Ne),
+ BinOpKind::Ne => Some(BinOpKind::Eq),
+ BinOpKind::Gt => Some(BinOpKind::Le),
+ BinOpKind::Ge => Some(BinOpKind::Lt),
+ BinOpKind::Lt => Some(BinOpKind::Ge),
+ BinOpKind::Le => Some(BinOpKind::Gt),
+ _ => None,
+ }
+ }
+
+ // prevent folding of `cfg!` macros and the like
+ if !e.span.from_expansion() {
+ match &e.kind {
+ ExprKind::Unary(UnOp::Not, inner) => return Ok(Bool::Not(Box::new(self.run(inner)?))),
+ ExprKind::Binary(binop, lhs, rhs) => match &binop.node {
+ BinOpKind::Or => {
+ return Ok(Bool::Or(self.extract(BinOpKind::Or, &[lhs, rhs], Vec::new())?));
+ },
+ BinOpKind::And => {
+ return Ok(Bool::And(self.extract(BinOpKind::And, &[lhs, rhs], Vec::new())?));
+ },
+ _ => (),
+ },
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Bool(true) => return Ok(Bool::True),
+ LitKind::Bool(false) => return Ok(Bool::False),
+ _ => (),
+ },
+ _ => (),
+ }
+ }
+ for (n, expr) in self.terminals.iter().enumerate() {
+ if eq_expr_value(self.cx, e, expr) {
+ #[expect(clippy::cast_possible_truncation)]
+ return Ok(Bool::Term(n as u8));
+ }
+
+ if_chain! {
+ if let ExprKind::Binary(e_binop, e_lhs, e_rhs) = &e.kind;
+ if implements_ord(self.cx, e_lhs);
+ if let ExprKind::Binary(expr_binop, expr_lhs, expr_rhs) = &expr.kind;
+ if negate(e_binop.node) == Some(expr_binop.node);
+ if eq_expr_value(self.cx, e_lhs, expr_lhs);
+ if eq_expr_value(self.cx, e_rhs, expr_rhs);
+ then {
+ #[expect(clippy::cast_possible_truncation)]
+ return Ok(Bool::Not(Box::new(Bool::Term(n as u8))));
+ }
+ }
+ }
+ let n = self.terminals.len();
+ self.terminals.push(e);
+ if n < 32 {
+ #[expect(clippy::cast_possible_truncation)]
+ Ok(Bool::Term(n as u8))
+ } else {
+ Err("too many literals".to_owned())
+ }
+ }
+}
+
+struct SuggestContext<'a, 'tcx, 'v> {
+ terminals: &'v [&'v Expr<'v>],
+ cx: &'a LateContext<'tcx>,
+ output: String,
+}
+
+impl<'a, 'tcx, 'v> SuggestContext<'a, 'tcx, 'v> {
+ fn recurse(&mut self, suggestion: &Bool) -> Option<()> {
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ match suggestion {
+ True => {
+ self.output.push_str("true");
+ },
+ False => {
+ self.output.push_str("false");
+ },
+ Not(inner) => match **inner {
+ And(_) | Or(_) => {
+ self.output.push('!');
+ self.output.push('(');
+ self.recurse(inner);
+ self.output.push(')');
+ },
+ Term(n) => {
+ let terminal = self.terminals[n as usize];
+ if let Some(str) = simplify_not(self.cx, terminal) {
+ self.output.push_str(&str);
+ } else {
+ self.output.push('!');
+ let snip = snippet_opt(self.cx, terminal.span)?;
+ self.output.push_str(&snip);
+ }
+ },
+ True | False | Not(_) => {
+ self.output.push('!');
+ self.recurse(inner)?;
+ },
+ },
+ And(v) => {
+ for (index, inner) in v.iter().enumerate() {
+ if index > 0 {
+ self.output.push_str(" && ");
+ }
+ if let Or(_) = *inner {
+ self.output.push('(');
+ self.recurse(inner);
+ self.output.push(')');
+ } else {
+ self.recurse(inner);
+ }
+ }
+ },
+ Or(v) => {
+ for (index, inner) in v.iter().rev().enumerate() {
+ if index > 0 {
+ self.output.push_str(" || ");
+ }
+ self.recurse(inner);
+ }
+ },
+ &Term(n) => {
+ let snip = snippet_opt(self.cx, self.terminals[n as usize].span.source_callsite())?;
+ self.output.push_str(&snip);
+ },
+ }
+ Some(())
+ }
+}
+
+fn simplify_not(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
+ match &expr.kind {
+ ExprKind::Binary(binop, lhs, rhs) => {
+ if !implements_ord(cx, lhs) {
+ return None;
+ }
+
+ match binop.node {
+ BinOpKind::Eq => Some(" != "),
+ BinOpKind::Ne => Some(" == "),
+ BinOpKind::Lt => Some(" >= "),
+ BinOpKind::Gt => Some(" <= "),
+ BinOpKind::Le => Some(" > "),
+ BinOpKind::Ge => Some(" < "),
+ _ => None,
+ }
+ .and_then(|op| {
+ Some(format!(
+ "{}{op}{}",
+ snippet_opt(cx, lhs.span)?,
+ snippet_opt(cx, rhs.span)?
+ ))
+ })
+ },
+ ExprKind::MethodCall(path, receiver, [], _) => {
+ let type_of_receiver = cx.typeck_results().expr_ty(receiver);
+ if !is_type_diagnostic_item(cx, type_of_receiver, sym::Option)
+ && !is_type_diagnostic_item(cx, type_of_receiver, sym::Result)
+ {
+ return None;
+ }
+ METHODS_WITH_NEGATION
+ .iter()
+ .copied()
+ .flat_map(|(a, b)| vec![(a, b), (b, a)])
+ .find(|&(a, _)| {
+ let path: &str = path.ident.name.as_str();
+ a == path
+ })
+ .and_then(|(_, neg_method)| Some(format!("{}.{neg_method}()", snippet_opt(cx, receiver.span)?)))
+ },
+ _ => None,
+ }
+}
+
+fn suggest(cx: &LateContext<'_>, suggestion: &Bool, terminals: &[&Expr<'_>]) -> String {
+ let mut suggest_context = SuggestContext {
+ terminals,
+ cx,
+ output: String::new(),
+ };
+ suggest_context.recurse(suggestion);
+ suggest_context.output
+}
+
+fn simple_negate(b: Bool) -> Bool {
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ match b {
+ True => False,
+ False => True,
+ t @ Term(_) => Not(Box::new(t)),
+ And(mut v) => {
+ for el in &mut v {
+ *el = simple_negate(::std::mem::replace(el, True));
+ }
+ Or(v)
+ },
+ Or(mut v) => {
+ for el in &mut v {
+ *el = simple_negate(::std::mem::replace(el, True));
+ }
+ And(v)
+ },
+ Not(inner) => *inner,
+ }
+}
+
+#[derive(Default)]
+struct Stats {
+ terminals: [usize; 32],
+ negations: usize,
+ ops: usize,
+}
+
+fn terminal_stats(b: &Bool) -> Stats {
+ fn recurse(b: &Bool, stats: &mut Stats) {
+ match b {
+ True | False => stats.ops += 1,
+ Not(inner) => {
+ match **inner {
+ And(_) | Or(_) => stats.ops += 1, // brackets are also operations
+ _ => stats.negations += 1,
+ }
+ recurse(inner, stats);
+ },
+ And(v) | Or(v) => {
+ stats.ops += v.len() - 1;
+ for inner in v {
+ recurse(inner, stats);
+ }
+ },
+ &Term(n) => stats.terminals[n as usize] += 1,
+ }
+ }
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ let mut stats = Stats::default();
+ recurse(b, &mut stats);
+ stats
+}
+
+impl<'a, 'tcx> NonminimalBoolVisitor<'a, 'tcx> {
+ fn bool_expr(&self, e: &'tcx Expr<'_>) {
+ let mut h2q = Hir2Qmm {
+ terminals: Vec::new(),
+ cx: self.cx,
+ };
+ if let Ok(expr) = h2q.run(e) {
+ if h2q.terminals.len() > 8 {
+ // QMC has exponentially slow behavior as the number of terminals increases
+ // 8 is reasonable, it takes approximately 0.2 seconds.
+ // See #825
+ return;
+ }
+
+ let stats = terminal_stats(&expr);
+ let mut simplified = expr.simplify();
+ for simple in Bool::Not(Box::new(expr)).simplify() {
+ match simple {
+ Bool::Not(_) | Bool::True | Bool::False => {},
+ _ => simplified.push(Bool::Not(Box::new(simple.clone()))),
+ }
+ let simple_negated = simple_negate(simple);
+ if simplified.iter().any(|s| *s == simple_negated) {
+ continue;
+ }
+ simplified.push(simple_negated);
+ }
+ let mut improvements = Vec::with_capacity(simplified.len());
+ 'simplified: for suggestion in &simplified {
+ let simplified_stats = terminal_stats(suggestion);
+ let mut improvement = false;
+ for i in 0..32 {
+ // ignore any "simplifications" that end up requiring a terminal more often
+ // than in the original expression
+ if stats.terminals[i] < simplified_stats.terminals[i] {
+ continue 'simplified;
+ }
+ if stats.terminals[i] != 0 && simplified_stats.terminals[i] == 0 {
+ span_lint_hir_and_then(
+ self.cx,
+ OVERLY_COMPLEX_BOOL_EXPR,
+ e.hir_id,
+ e.span,
+ "this boolean expression contains a logic bug",
+ |diag| {
+ diag.span_help(
+ h2q.terminals[i].span,
+ "this expression can be optimized out by applying boolean operations to the \
+ outer expression",
+ );
+ diag.span_suggestion(
+ e.span,
+ "it would look like the following",
+ suggest(self.cx, suggestion, &h2q.terminals),
+ // nonminimal_bool can produce minimal but
+ // not human readable expressions (#3141)
+ Applicability::Unspecified,
+ );
+ },
+ );
+ // don't also lint `NONMINIMAL_BOOL`
+ return;
+ }
+ // if the number of occurrences of a terminal decreases or any of the stats
+ // decreases while none increases
+ improvement |= (stats.terminals[i] > simplified_stats.terminals[i])
+ || (stats.negations > simplified_stats.negations && stats.ops == simplified_stats.ops)
+ || (stats.ops > simplified_stats.ops && stats.negations == simplified_stats.negations);
+ }
+ if improvement {
+ improvements.push(suggestion);
+ }
+ }
+ let nonminimal_bool_lint = |suggestions: Vec<_>| {
+ span_lint_hir_and_then(
+ self.cx,
+ NONMINIMAL_BOOL,
+ e.hir_id,
+ e.span,
+ "this boolean expression can be simplified",
+ |diag| {
+ diag.span_suggestions(
+ e.span,
+ "try",
+ suggestions.into_iter(),
+ // nonminimal_bool can produce minimal but
+ // not human readable expressions (#3141)
+ Applicability::Unspecified,
+ );
+ },
+ );
+ };
+ if improvements.is_empty() {
+ let mut visitor = NotSimplificationVisitor { cx: self.cx };
+ visitor.visit_expr(e);
+ } else {
+ nonminimal_bool_lint(
+ improvements
+ .into_iter()
+ .map(|suggestion| suggest(self.cx, suggestion, &h2q.terminals))
+ .collect(),
+ );
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for NonminimalBoolVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !e.span.from_expansion() {
+ match &e.kind {
+ ExprKind::Binary(binop, _, _) if binop.node == BinOpKind::Or || binop.node == BinOpKind::And => {
+ self.bool_expr(e);
+ },
+ ExprKind::Unary(UnOp::Not, inner) => {
+ if self.cx.typeck_results().node_types()[inner.hir_id].is_bool() {
+ self.bool_expr(e);
+ }
+ },
+ _ => {},
+ }
+ }
+ walk_expr(self, e);
+ }
+}
+
+fn implements_ord<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> bool {
+ let ty = cx.typeck_results().expr_ty(expr);
++ cx.tcx
++ .get_diagnostic_item(sym::Ord)
++ .map_or(false, |id| implements_trait(cx, ty, id, &[]))
+}
+
+struct NotSimplificationVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for NotSimplificationVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Unary(UnOp::Not, inner) = &expr.kind {
+ if let Some(suggestion) = simplify_not(self.cx, inner) {
+ span_lint_and_sugg(
+ self.cx,
+ NONMINIMAL_BOOL,
+ expr.span,
+ "this boolean expression can be simplified",
+ "try",
+ suggestion,
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+
+ walk_expr(self, expr);
+ }
+}
--- /dev/null
- use clippy_utils::{diagnostics::span_lint_and_help, is_default_equivalent, path_def_id};
- use rustc_hir::{Expr, ExprKind, QPath};
++use clippy_utils::{
++ diagnostics::span_lint_and_sugg, get_parent_node, is_default_equivalent, macros::macro_backtrace, match_path,
++ path_def_id, paths, ty::expr_sig,
++};
++use rustc_errors::Applicability;
++use rustc_hir::{
++ intravisit::{walk_ty, Visitor},
++ Block, Expr, ExprKind, Local, Node, QPath, TyKind,
++};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// checks for `Box::new(T::default())`, which is better written as
+ /// `Box::<T>::default()`.
+ ///
+ /// ### Why is this bad?
+ /// First, it's more complex, involving two calls instead of one.
+ /// Second, `Box::default()` can be faster
+ /// [in certain cases](https://nnethercote.github.io/perf-book/standard-library-types.html#box).
+ ///
- /// ### Known problems
- /// The lint may miss some cases (e.g. Box::new(String::from(""))).
- /// On the other hand, it will trigger on cases where the `default`
- /// code comes from a macro that does something different based on
- /// e.g. target operating system.
- ///
+ /// ### Example
+ /// ```rust
+ /// let x: Box<String> = Box::new(Default::default());
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x: Box<String> = Box::default();
+ /// ```
+ #[clippy::version = "1.65.0"]
+ pub BOX_DEFAULT,
+ perf,
+ "Using Box::new(T::default()) instead of Box::default()"
+}
+
+declare_lint_pass!(BoxDefault => [BOX_DEFAULT]);
+
+impl LateLintPass<'_> for BoxDefault {
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if let ExprKind::Call(box_new, [arg]) = expr.kind
+ && let ExprKind::Path(QPath::TypeRelative(ty, seg)) = box_new.kind
- && let ExprKind::Call(..) = arg.kind
++ && let ExprKind::Call(arg_path, ..) = arg.kind
+ && !in_external_macro(cx.sess(), expr.span)
- && expr.span.eq_ctxt(arg.span)
++ && (expr.span.eq_ctxt(arg.span) || is_vec_expn(cx, arg))
+ && seg.ident.name == sym::new
- && path_def_id(cx, ty) == cx.tcx.lang_items().owned_box()
++ && path_def_id(cx, ty).map_or(false, |id| Some(id) == cx.tcx.lang_items().owned_box())
+ && is_default_equivalent(cx, arg)
+ {
- span_lint_and_help(
++ let arg_ty = cx.typeck_results().expr_ty(arg);
++ span_lint_and_sugg(
+ cx,
+ BOX_DEFAULT,
+ expr.span,
+ "`Box::new(_)` of default value",
- None,
- "use `Box::default()` instead",
++ "try",
++ if is_plain_default(arg_path) || given_type(cx, expr) {
++ "Box::default()".into()
++ } else {
++ format!("Box::<{arg_ty}>::default()")
++ },
++ Applicability::MachineApplicable
+ );
+ }
+ }
+}
++
++fn is_plain_default(arg_path: &Expr<'_>) -> bool {
++ // we need to match the actual path so we don't match e.g. "u8::default"
++ if let ExprKind::Path(QPath::Resolved(None, path)) = &arg_path.kind {
++ // avoid generic parameters
++ match_path(path, &paths::DEFAULT_TRAIT_METHOD) && path.segments.iter().all(|seg| seg.args.is_none())
++ } else {
++ false
++ }
++}
++
++fn is_vec_expn(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
++ macro_backtrace(expr.span)
++ .next()
++ .map_or(false, |call| cx.tcx.is_diagnostic_item(sym::vec_macro, call.def_id))
++}
++
++#[derive(Default)]
++struct InferVisitor(bool);
++
++impl<'tcx> Visitor<'tcx> for InferVisitor {
++ fn visit_ty(&mut self, t: &rustc_hir::Ty<'_>) {
++ self.0 |= matches!(t.kind, TyKind::Infer | TyKind::OpaqueDef(..) | TyKind::TraitObject(..));
++ if !self.0 {
++ walk_ty(self, t);
++ }
++ }
++}
++
++fn given_type(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
++ match get_parent_node(cx.tcx, expr.hir_id) {
++ Some(Node::Local(Local { ty: Some(ty), .. })) => {
++ let mut v = InferVisitor::default();
++ v.visit_ty(ty);
++ !v.0
++ },
++ Some(
++ Node::Expr(Expr {
++ kind: ExprKind::Call(path, args),
++ ..
++ }) | Node::Block(Block {
++ expr:
++ Some(Expr {
++ kind: ExprKind::Call(path, args),
++ ..
++ }),
++ ..
++ }),
++ ) => {
++ if let Some(index) = args.iter().position(|arg| arg.hir_id == expr.hir_id) &&
++ let Some(sig) = expr_sig(cx, path) &&
++ let Some(input) = sig.input(index)
++ {
++ input.no_bound_vars().is_some()
++ } else {
++ false
++ }
++ },
++ _ => false,
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::source::snippet_opt;
++use rustc_errors::Applicability;
++use rustc_hir::{Expr, ExprKind};
++use rustc_lint::LateContext;
++use rustc_middle::{
++ mir::Mutability,
++ ty::{self, Ty, TypeAndMut},
++};
++
++use super::AS_PTR_CAST_MUT;
++
++pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>, cast_to: Ty<'_>) {
++ if let ty::RawPtr(ptrty @ TypeAndMut { mutbl: Mutability::Mut, .. }) = cast_to.kind()
++ && let ty::RawPtr(TypeAndMut { mutbl: Mutability::Not, .. }) =
++ cx.typeck_results().node_type(cast_expr.hir_id).kind()
++ && let ExprKind::MethodCall(method_name, receiver, [], _) = cast_expr.peel_blocks().kind
++ && method_name.ident.name == rustc_span::sym::as_ptr
++ && let Some(as_ptr_did) = cx.typeck_results().type_dependent_def_id(cast_expr.peel_blocks().hir_id)
++ && let as_ptr_sig = cx.tcx.fn_sig(as_ptr_did)
++ && let Some(first_param_ty) = as_ptr_sig.skip_binder().inputs().iter().next()
++ && let ty::Ref(_, _, Mutability::Not) = first_param_ty.kind()
++ && let Some(recv) = snippet_opt(cx, receiver.span)
++ {
++ // `as_mut_ptr` might not exist
++ let applicability = Applicability::MaybeIncorrect;
++
++ span_lint_and_sugg(
++ cx,
++ AS_PTR_CAST_MUT,
++ expr.span,
++ &format!("casting the result of `as_ptr` to *{ptrty}"),
++ "replace with",
++ format!("{recv}.as_mut_ptr()"),
++ applicability
++ );
++ }
++}
--- /dev/null
--- /dev/null
++use super::CAST_NAN_TO_INT;
++
++use clippy_utils::consts::{constant, Constant};
++use clippy_utils::diagnostics::span_lint_and_note;
++use rustc_hir::Expr;
++use rustc_lint::LateContext;
++use rustc_middle::ty::Ty;
++
++pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>, from_ty: Ty<'_>, to_ty: Ty<'_>) {
++ if from_ty.is_floating_point() && to_ty.is_integral() && is_known_nan(cx, cast_expr) {
++ span_lint_and_note(
++ cx,
++ CAST_NAN_TO_INT,
++ expr.span,
++ &format!("casting a known NaN to {to_ty}"),
++ None,
++ "this always evaluates to 0",
++ );
++ }
++}
++
++fn is_known_nan(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
++ match constant(cx, cx.typeck_results(), e) {
++ Some((Constant::F64(n), _)) => n.is_nan(),
++ Some((Constant::F32(n), _)) => n.is_nan(),
++ _ => false,
++ }
++}
--- /dev/null
- CAST_SLICE_FROM_RAW_PARTS
++mod as_ptr_cast_mut;
+mod as_underscore;
+mod borrow_as_ptr;
+mod cast_abs_to_unsigned;
+mod cast_enum_constructor;
+mod cast_lossless;
++mod cast_nan_to_int;
+mod cast_possible_truncation;
+mod cast_possible_wrap;
+mod cast_precision_loss;
+mod cast_ptr_alignment;
+mod cast_ref_to_mut;
+mod cast_sign_loss;
+mod cast_slice_different_sizes;
+mod cast_slice_from_raw_parts;
+mod char_lit_as_u8;
+mod fn_to_numeric_cast;
+mod fn_to_numeric_cast_any;
+mod fn_to_numeric_cast_with_truncation;
+mod ptr_as_ptr;
+mod unnecessary_cast;
+mod utils;
+
+use clippy_utils::{is_hir_ty_cfg_dependant, meets_msrv, msrvs};
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts from any numerical to a float type where
+ /// the receiving type cannot store all values from the original type without
+ /// rounding errors. This possible rounding is to be expected, so this lint is
+ /// `Allow` by default.
+ ///
+ /// Basically, this warns on casting any integer with 32 or more bits to `f32`
+ /// or any 64-bit integer to `f64`.
+ ///
+ /// ### Why is this bad?
+ /// It's not bad at all. But in some applications it can be
+ /// helpful to know where precision loss can take place. This lint can help find
+ /// those places in the code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = u64::MAX;
+ /// x as f64;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_PRECISION_LOSS,
+ pedantic,
+ "casts that cause loss of precision, e.g., `x as f32` where `x: u64`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts from a signed to an unsigned numerical
+ /// type. In this case, negative values wrap around to large positive values,
+ /// which can be quite surprising in practice. However, as the cast works as
+ /// defined, this lint is `Allow` by default.
+ ///
+ /// ### Why is this bad?
+ /// Possibly surprising results. You can activate this lint
+ /// as a one-time check to see where numerical wrapping can arise.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let y: i8 = -1;
+ /// y as u128; // will return 18446744073709551615
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_SIGN_LOSS,
+ pedantic,
+ "casts from signed types to unsigned types, e.g., `x as u32` where `x: i32`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts between numerical types that may
+ /// truncate large values. This is expected behavior, so the cast is `Allow` by
+ /// default.
+ ///
+ /// ### Why is this bad?
+ /// In some problem domains, it is good practice to avoid
+ /// truncation. This lint can be activated to help assess where additional
+ /// checks could be beneficial.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn as_u8(x: u64) -> u8 {
+ /// x as u8
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_POSSIBLE_TRUNCATION,
+ pedantic,
+ "casts that may cause truncation of the value, e.g., `x as u8` where `x: u32`, or `x as i32` where `x: f32`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts from an unsigned type to a signed type of
+ /// the same size. Performing such a cast is a 'no-op' for the compiler,
+ /// i.e., nothing is changed at the bit level, and the binary representation of
+ /// the value is reinterpreted. This can cause wrapping if the value is too big
+ /// for the target signed type. However, the cast works as defined, so this lint
+ /// is `Allow` by default.
+ ///
+ /// ### Why is this bad?
+ /// While such a cast is not bad in itself, the results can
+ /// be surprising when this is not the intended behavior, as demonstrated by the
+ /// example below.
+ ///
+ /// ### Example
+ /// ```rust
+ /// u32::MAX as i32; // will yield a value of `-1`
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_POSSIBLE_WRAP,
+ pedantic,
+ "casts that may cause wrapping around the value, e.g., `x as i32` where `x: u32` and `x > i32::MAX`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts between numerical types that may
+ /// be replaced by safe conversion functions.
+ ///
+ /// ### Why is this bad?
+ /// Rust's `as` keyword will perform many kinds of
+ /// conversions, including silently lossy conversions. Conversion functions such
+ /// as `i32::from` will only perform lossless conversions. Using the conversion
+ /// functions prevents conversions from turning into silent lossy conversions if
+ /// the types of the input expressions ever change, and make it easier for
+ /// people reading the code to know that the conversion is lossless.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn as_u64(x: u8) -> u64 {
+ /// x as u64
+ /// }
+ /// ```
+ ///
+ /// Using `::from` would look like this:
+ ///
+ /// ```rust
+ /// fn as_u64(x: u8) -> u64 {
+ /// u64::from(x)
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_LOSSLESS,
+ pedantic,
+ "casts using `as` that are known to be lossless, e.g., `x as u64` where `x: u8`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts to the same type, casts of int literals to integer types
+ /// and casts of float literals to float types.
+ ///
+ /// ### Why is this bad?
+ /// It's just unnecessary.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = 2i32 as i32;
+ /// let _ = 0.5 as f32;
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust
+ /// let _ = 2_i32;
+ /// let _ = 0.5_f32;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNNECESSARY_CAST,
+ complexity,
+ "cast to the same type, e.g., `x as i32` where `x: i32`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts, using `as` or `pointer::cast`,
+ /// from a less-strictly-aligned pointer to a more-strictly-aligned pointer
+ ///
+ /// ### Why is this bad?
+ /// Dereferencing the resulting pointer may be undefined
+ /// behavior.
+ ///
+ /// ### Known problems
+ /// Using `std::ptr::read_unaligned` and `std::ptr::write_unaligned` or similar
+ /// on the resulting pointer is fine. Is over-zealous: Casts with manual alignment checks or casts like
+ /// u64-> u8 -> u16 can be fine. Miri is able to do a more in-depth analysis.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (&1u8 as *const u8) as *const u16;
+ /// let _ = (&mut 1u8 as *mut u8) as *mut u16;
+ ///
+ /// (&1u8 as *const u8).cast::<u16>();
+ /// (&mut 1u8 as *mut u8).cast::<u16>();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CAST_PTR_ALIGNMENT,
+ pedantic,
+ "cast from a pointer to a more-strictly-aligned pointer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts of function pointers to something other than usize
+ ///
+ /// ### Why is this bad?
+ /// Casting a function pointer to anything other than usize/isize is not portable across
+ /// architectures, because you end up losing bits if the target type is too small or end up with a
+ /// bunch of extra bits that waste space and add more instructions to the final binary than
+ /// strictly necessary for the problem
+ ///
+ /// Casting to isize also doesn't make sense since there are no signed addresses.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn fun() -> i32 { 1 }
+ /// let _ = fun as i64;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # fn fun() -> i32 { 1 }
+ /// let _ = fun as usize;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FN_TO_NUMERIC_CAST,
+ style,
+ "casting a function pointer to a numeric type other than usize"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts of a function pointer to a numeric type not wide enough to
+ /// store address.
+ ///
+ /// ### Why is this bad?
+ /// Such a cast discards some bits of the function's address. If this is intended, it would be more
+ /// clearly expressed by casting to usize first, then casting the usize to the intended type (with
+ /// a comment) to perform the truncation.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn fn1() -> i16 {
+ /// 1
+ /// };
+ /// let _ = fn1 as i32;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// // Cast to usize first, then comment with the reason for the truncation
+ /// fn fn1() -> i16 {
+ /// 1
+ /// };
+ /// let fn_ptr = fn1 as usize;
+ /// let fn_ptr_truncated = fn_ptr as i32;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FN_TO_NUMERIC_CAST_WITH_TRUNCATION,
+ style,
+ "casting a function pointer to a numeric type not wide enough to store the address"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts of a function pointer to any integer type.
+ ///
+ /// ### Why is this bad?
+ /// Casting a function pointer to an integer can have surprising results and can occur
+ /// accidentally if parentheses are omitted from a function call. If you aren't doing anything
+ /// low-level with function pointers then you can opt-out of casting functions to integers in
+ /// order to avoid mistakes. Alternatively, you can use this lint to audit all uses of function
+ /// pointer casts in your code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // fn1 is cast as `usize`
+ /// fn fn1() -> u16 {
+ /// 1
+ /// };
+ /// let _ = fn1 as usize;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// // maybe you intended to call the function?
+ /// fn fn2() -> u16 {
+ /// 1
+ /// };
+ /// let _ = fn2() as usize;
+ ///
+ /// // or
+ ///
+ /// // maybe you intended to cast it to a function type?
+ /// fn fn3() -> u16 {
+ /// 1
+ /// }
+ /// let _ = fn3 as fn() -> u16;
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub FN_TO_NUMERIC_CAST_ANY,
+ restriction,
+ "casting a function pointer to any integer type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts of `&T` to `&mut T` anywhere in the code.
+ ///
+ /// ### Why is this bad?
+ /// It’s basically guaranteed to be undefined behavior.
+ /// `UnsafeCell` is the only way to obtain aliasable data that is considered
+ /// mutable.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// fn x(r: &i32) {
+ /// unsafe {
+ /// *(r as *const _ as *mut _) += 1;
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Instead consider using interior mutability types.
+ ///
+ /// ```rust
+ /// use std::cell::UnsafeCell;
+ ///
+ /// fn x(r: &UnsafeCell<i32>) {
+ /// unsafe {
+ /// *r.get() += 1;
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.33.0"]
+ pub CAST_REF_TO_MUT,
+ correctness,
+ "a cast of reference to a mutable pointer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for expressions where a character literal is cast
+ /// to `u8` and suggests using a byte literal instead.
+ ///
+ /// ### Why is this bad?
+ /// In general, casting values to smaller types is
+ /// error-prone and should be avoided where possible. In the particular case of
+ /// converting a character literal to u8, it is easy to avoid by just using a
+ /// byte literal instead. As an added bonus, `b'a'` is even slightly shorter
+ /// than `'a' as u8`.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// 'x' as u8
+ /// ```
+ ///
+ /// A better version, using the byte literal:
+ ///
+ /// ```rust,ignore
+ /// b'x'
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHAR_LIT_AS_U8,
+ complexity,
+ "casting a character literal to `u8` truncates"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `as` casts between raw pointers without changing its mutability,
+ /// namely `*const T` to `*const U` and `*mut T` to `*mut U`.
+ ///
+ /// ### Why is this bad?
+ /// Though `as` casts between raw pointers is not terrible, `pointer::cast` is safer because
+ /// it cannot accidentally change the pointer's mutability nor cast the pointer to other types like `usize`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let ptr: *const u32 = &42_u32;
+ /// let mut_ptr: *mut u32 = &mut 42_u32;
+ /// let _ = ptr as *const i32;
+ /// let _ = mut_ptr as *mut i32;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let ptr: *const u32 = &42_u32;
+ /// let mut_ptr: *mut u32 = &mut 42_u32;
+ /// let _ = ptr.cast::<i32>();
+ /// let _ = mut_ptr.cast::<i32>();
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub PTR_AS_PTR,
+ pedantic,
+ "casting using `as` from and to raw pointers that doesn't change its mutability, where `pointer::cast` could take the place of `as`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts from an enum type to an integral type which will definitely truncate the
+ /// value.
+ ///
+ /// ### Why is this bad?
+ /// The resulting integral value will not match the value of the variant it came from.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum E { X = 256 };
+ /// let _ = E::X as u8;
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub CAST_ENUM_TRUNCATION,
+ suspicious,
+ "casts from an enum type to an integral type which will truncate the value"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `as` casts between raw pointers to slices with differently sized elements.
+ ///
+ /// ### Why is this bad?
+ /// The produced raw pointer to a slice does not update its length metadata. The produced
+ /// pointer will point to a different number of bytes than the original pointer because the
+ /// length metadata of a raw slice pointer is in elements rather than bytes.
+ /// Producing a slice reference from the raw pointer will either create a slice with
+ /// less data (which can be surprising) or create a slice with more data and cause Undefined Behavior.
+ ///
+ /// ### Example
+ /// // Missing data
+ /// ```rust
+ /// let a = [1_i32, 2, 3, 4];
+ /// let p = &a as *const [i32] as *const [u8];
+ /// unsafe {
+ /// println!("{:?}", &*p);
+ /// }
+ /// ```
+ /// // Undefined Behavior (note: also potential alignment issues)
+ /// ```rust
+ /// let a = [1_u8, 2, 3, 4];
+ /// let p = &a as *const [u8] as *const [u32];
+ /// unsafe {
+ /// println!("{:?}", &*p);
+ /// }
+ /// ```
+ /// Instead use `ptr::slice_from_raw_parts` to construct a slice from a data pointer and the correct length
+ /// ```rust
+ /// let a = [1_i32, 2, 3, 4];
+ /// let old_ptr = &a as *const [i32];
+ /// // The data pointer is cast to a pointer to the target `u8` not `[u8]`
+ /// // The length comes from the known length of 4 i32s times the 4 bytes per i32
+ /// let new_ptr = core::ptr::slice_from_raw_parts(old_ptr as *const u8, 16);
+ /// unsafe {
+ /// println!("{:?}", &*new_ptr);
+ /// }
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub CAST_SLICE_DIFFERENT_SIZES,
+ correctness,
+ "casting using `as` between raw pointers to slices of types with different sizes"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for casts from an enum tuple constructor to an integer.
+ ///
+ /// ### Why is this bad?
+ /// The cast is easily confused with casting a c-like enum value to an integer.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum E { X(i32) };
+ /// let _ = E::X as usize;
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub CAST_ENUM_CONSTRUCTOR,
+ suspicious,
+ "casts from an enum tuple constructor to an integer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for uses of the `abs()` method that cast the result to unsigned.
+ ///
+ /// ### Why is this bad?
+ /// The `unsigned_abs()` method avoids panic when called on the MIN value.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: i32 = -42;
+ /// let y: u32 = x.abs() as u32;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x: i32 = -42;
+ /// let y: u32 = x.unsigned_abs();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub CAST_ABS_TO_UNSIGNED,
+ suspicious,
+ "casting the result of `abs()` to an unsigned integer can panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check for the usage of `as _` conversion using inferred type.
+ ///
+ /// ### Why is this bad?
+ /// The conversion might include lossy conversion and dangerous cast that might go
+ /// undetected due to the type being inferred.
+ ///
+ /// The lint is allowed by default as using `_` is less wordy than always specifying the type.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(n: usize) {}
+ /// let n: u16 = 256;
+ /// foo(n as _);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn foo(n: usize) {}
+ /// let n: u16 = 256;
+ /// foo(n as usize);
+ /// ```
+ #[clippy::version = "1.63.0"]
+ pub AS_UNDERSCORE,
+ restriction,
+ "detects `as _` conversion"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `&expr as *const T` or
+ /// `&mut expr as *mut T`, and suggest using `ptr::addr_of` or
+ /// `ptr::addr_of_mut` instead.
+ ///
+ /// ### Why is this bad?
+ /// This would improve readability and avoid creating a reference
+ /// that points to an uninitialized value or unaligned place.
+ /// Read the `ptr::addr_of` docs for more information.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let val = 1;
+ /// let p = &val as *const i32;
+ ///
+ /// let mut val_mut = 1;
+ /// let p_mut = &mut val_mut as *mut i32;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let val = 1;
+ /// let p = std::ptr::addr_of!(val);
+ ///
+ /// let mut val_mut = 1;
+ /// let p_mut = std::ptr::addr_of_mut!(val_mut);
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub BORROW_AS_PTR,
+ pedantic,
+ "borrowing just to cast to a raw pointer"
+}
++
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for a raw slice being cast to a slice pointer
+ ///
+ /// ### Why is this bad?
+ /// This can result in multiple `&mut` references to the same location when only a pointer is
+ /// required.
+ /// `ptr::slice_from_raw_parts` is a safe alternative that doesn't require
+ /// the same [safety requirements] to be upheld.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let _: *const [u8] = std::slice::from_raw_parts(ptr, len) as *const _;
+ /// let _: *mut [u8] = std::slice::from_raw_parts_mut(ptr, len) as *mut _;
+ /// ```
+ /// Use instead:
+ /// ```rust,ignore
+ /// let _: *const [u8] = std::ptr::slice_from_raw_parts(ptr, len);
+ /// let _: *mut [u8] = std::ptr::slice_from_raw_parts_mut(ptr, len);
+ /// ```
+ /// [safety requirements]: https://doc.rust-lang.org/std/slice/fn.from_raw_parts.html#safety
+ #[clippy::version = "1.64.0"]
+ pub CAST_SLICE_FROM_RAW_PARTS,
+ suspicious,
+ "casting a slice created from a pointer and length to a slice pointer"
+}
+
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for the result of a `&self`-taking `as_ptr` being cast to a mutable pointer
++ ///
++ /// ### Why is this bad?
++ /// Since `as_ptr` takes a `&self`, the pointer won't have write permissions unless interior
++ /// mutability is used, making it unlikely that having it as a mutable pointer is correct.
++ ///
++ /// ### Example
++ /// ```rust
++ /// let string = String::with_capacity(1);
++ /// let ptr = string.as_ptr() as *mut u8;
++ /// unsafe { ptr.write(4) }; // UNDEFINED BEHAVIOUR
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// let mut string = String::with_capacity(1);
++ /// let ptr = string.as_mut_ptr();
++ /// unsafe { ptr.write(4) };
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub AS_PTR_CAST_MUT,
++ nursery,
++ "casting the result of the `&self`-taking `as_ptr` to a mutabe pointer"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for a known NaN float being cast to an integer
++ ///
++ /// ### Why is this bad?
++ /// NaNs are cast into zero, so one could simply use this and make the
++ /// code more readable. The lint could also hint at a programmer error.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// let _: (0.0_f32 / 0.0) as u64;
++ /// ```
++ /// Use instead:
++ /// ```rust,ignore
++ /// let _: = 0_u64;
++ /// ```
++ #[clippy::version = "1.64.0"]
++ pub CAST_NAN_TO_INT,
++ suspicious,
++ "casting a known floating-point NaN into an integer"
++}
++
+pub struct Casts {
+ msrv: Option<RustcVersion>,
+}
+
+impl Casts {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(Casts => [
+ CAST_PRECISION_LOSS,
+ CAST_SIGN_LOSS,
+ CAST_POSSIBLE_TRUNCATION,
+ CAST_POSSIBLE_WRAP,
+ CAST_LOSSLESS,
+ CAST_REF_TO_MUT,
+ CAST_PTR_ALIGNMENT,
+ CAST_SLICE_DIFFERENT_SIZES,
+ UNNECESSARY_CAST,
+ FN_TO_NUMERIC_CAST_ANY,
+ FN_TO_NUMERIC_CAST,
+ FN_TO_NUMERIC_CAST_WITH_TRUNCATION,
+ CHAR_LIT_AS_U8,
+ PTR_AS_PTR,
+ CAST_ENUM_TRUNCATION,
+ CAST_ENUM_CONSTRUCTOR,
+ CAST_ABS_TO_UNSIGNED,
+ AS_UNDERSCORE,
+ BORROW_AS_PTR,
++ CAST_SLICE_FROM_RAW_PARTS,
++ AS_PTR_CAST_MUT,
++ CAST_NAN_TO_INT,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Casts {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if !in_external_macro(cx.sess(), expr.span) {
+ ptr_as_ptr::check(cx, expr, self.msrv);
+ }
+
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ if let ExprKind::Cast(cast_expr, cast_to_hir) = expr.kind {
+ if is_hir_ty_cfg_dependant(cx, cast_to_hir) {
+ return;
+ }
+ let (cast_from, cast_to) = (
+ cx.typeck_results().expr_ty(cast_expr),
+ cx.typeck_results().expr_ty(expr),
+ );
+
+ if unnecessary_cast::check(cx, expr, cast_expr, cast_from, cast_to) {
+ return;
+ }
+ cast_slice_from_raw_parts::check(cx, expr, cast_expr, cast_to, self.msrv);
++ as_ptr_cast_mut::check(cx, expr, cast_expr, cast_to);
+ fn_to_numeric_cast_any::check(cx, expr, cast_expr, cast_from, cast_to);
+ fn_to_numeric_cast::check(cx, expr, cast_expr, cast_from, cast_to);
+ fn_to_numeric_cast_with_truncation::check(cx, expr, cast_expr, cast_from, cast_to);
+
+ if cast_to.is_numeric() && !in_external_macro(cx.sess(), expr.span) {
+ cast_possible_truncation::check(cx, expr, cast_expr, cast_from, cast_to);
+ if cast_from.is_numeric() {
+ cast_possible_wrap::check(cx, expr, cast_from, cast_to);
+ cast_precision_loss::check(cx, expr, cast_from, cast_to);
+ cast_sign_loss::check(cx, expr, cast_expr, cast_from, cast_to);
+ cast_abs_to_unsigned::check(cx, expr, cast_expr, cast_from, cast_to, self.msrv);
++ cast_nan_to_int::check(cx, expr, cast_expr, cast_from, cast_to);
+ }
+ cast_lossless::check(cx, expr, cast_expr, cast_from, cast_to, self.msrv);
+ cast_enum_constructor::check(cx, expr, cast_expr, cast_from);
+ }
+
+ as_underscore::check(cx, expr, cast_to_hir);
+
+ if meets_msrv(self.msrv, msrvs::BORROW_AS_PTR) {
+ borrow_as_ptr::check(cx, expr, cast_expr, cast_to_hir);
+ }
+ }
+
+ cast_ref_to_mut::check(cx, expr);
+ cast_ptr_alignment::check(cx, expr);
+ char_lit_as_u8::check(cx, expr);
+ ptr_as_ptr::check(cx, expr, self.msrv);
+ cast_slice_different_sizes::check(cx, expr, self.msrv);
+ }
+
+ extract_msrv_attr!(LateContext);
+}
--- /dev/null
- LitKind::Int(_, LitIntType::Unsuffixed) | LitKind::Float(_, LitFloatType::Unsuffixed) => {
- return false;
- },
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::get_parent_expr;
+use clippy_utils::numeric_literal::NumericLiteral;
+use clippy_utils::source::snippet_opt;
+use if_chain::if_chain;
+use rustc_ast::{LitFloatType, LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::def::Res;
+use rustc_hir::{Expr, ExprKind, Lit, QPath, TyKind, UnOp};
+use rustc_lint::{LateContext, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, FloatTy, InferTy, Ty};
+
+use super::UNNECESSARY_CAST;
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &Expr<'tcx>,
+ cast_expr: &Expr<'tcx>,
+ cast_from: Ty<'tcx>,
+ cast_to: Ty<'tcx>,
+) -> bool {
+ // skip non-primitive type cast
+ if_chain! {
+ if let ExprKind::Cast(_, cast_to) = expr.kind;
+ if let TyKind::Path(QPath::Resolved(_, path)) = &cast_to.kind;
+ if let Res::PrimTy(_) = path.res;
+ then {}
+ else {
+ return false
+ }
+ }
+
+ let cast_str = snippet_opt(cx, cast_expr.span).unwrap_or_default();
+
+ if let Some(lit) = get_numeric_literal(cast_expr) {
+ let literal_str = &cast_str;
+
+ if_chain! {
+ if let LitKind::Int(n, _) = lit.node;
+ if let Some(src) = snippet_opt(cx, cast_expr.span);
+ if cast_to.is_floating_point();
+ if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit.node);
+ let from_nbits = 128 - n.leading_zeros();
+ let to_nbits = fp_ty_mantissa_nbits(cast_to);
+ if from_nbits != 0 && to_nbits != 0 && from_nbits <= to_nbits && num_lit.is_decimal();
+ then {
+ lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+ return true
+ }
+ }
+
+ match lit.node {
+ LitKind::Int(_, LitIntType::Unsuffixed) if cast_to.is_integral() => {
+ lint_unnecessary_cast(cx, expr, literal_str, cast_from, cast_to);
+ return false;
+ },
+ LitKind::Float(_, LitFloatType::Unsuffixed) if cast_to.is_floating_point() => {
+ lint_unnecessary_cast(cx, expr, literal_str, cast_from, cast_to);
+ return false;
+ },
+ LitKind::Int(_, LitIntType::Signed(_) | LitIntType::Unsigned(_))
+ | LitKind::Float(_, LitFloatType::Suffixed(_))
+ if cast_from.kind() == cast_to.kind() =>
+ {
+ if let Some(src) = snippet_opt(cx, cast_expr.span) {
+ if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit.node) {
+ lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+ return true;
+ }
+ }
+ },
+ _ => {},
+ }
+ }
+
+ if cast_from.kind() == cast_to.kind() && !in_external_macro(cx.sess(), expr.span) {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_CAST,
+ expr.span,
+ &format!("casting to the same type is unnecessary (`{cast_from}` -> `{cast_to}`)"),
+ "try",
+ cast_str,
+ Applicability::MachineApplicable,
+ );
+ return true;
+ }
+
+ false
+}
+
+fn lint_unnecessary_cast(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ raw_literal_str: &str,
+ cast_from: Ty<'_>,
+ cast_to: Ty<'_>,
+) {
+ let literal_kind_name = if cast_from.is_integral() { "integer" } else { "float" };
+ // first we remove all matches so `-(1)` become `-1`, and remove trailing dots, so `1.` become `1`
+ let literal_str = raw_literal_str
+ .replace(['(', ')'], "")
+ .trim_end_matches('.')
+ .to_string();
+ // we know need to check if the parent is a method call, to add parenthesis accordingly (eg:
+ // (-1).foo() instead of -1.foo())
+ let sugg = if let Some(parent_expr) = get_parent_expr(cx, expr)
+ && let ExprKind::MethodCall(..) = parent_expr.kind
+ && literal_str.starts_with('-')
+ {
+ format!("({literal_str}_{cast_to})")
+
+ } else {
+ format!("{literal_str}_{cast_to}")
+ };
+
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_CAST,
+ expr.span,
+ &format!("casting {literal_kind_name} literal to `{cast_to}` is unnecessary"),
+ "try",
+ sugg,
+ Applicability::MachineApplicable,
+ );
+}
+
+fn get_numeric_literal<'e>(expr: &'e Expr<'e>) -> Option<&'e Lit> {
+ match expr.kind {
+ ExprKind::Lit(ref lit) => Some(lit),
+ ExprKind::Unary(UnOp::Neg, e) => {
+ if let ExprKind::Lit(ref lit) = e.kind {
+ Some(lit)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Returns the mantissa bits wide of a fp type.
+/// Will return 0 if the type is not a fp
+fn fp_ty_mantissa_nbits(typ: Ty<'_>) -> u32 {
+ match typ.kind() {
+ ty::Float(FloatTy::F32) => 23,
+ ty::Float(FloatTy::F64) | ty::Infer(InferTy::FloatVar(_)) => 52,
+ _ => 0,
+ }
+}
--- /dev/null
- use clippy_utils::{get_trait_def_id, if_sequence, in_constant, is_else_clause, paths, SpanlessEq};
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::ty::implements_trait;
- let is_ord = get_trait_def_id(cx, &paths::ORD).map_or(false, |id| implements_trait(cx, ty, id, &[]));
++use clippy_utils::{if_sequence, in_constant, is_else_clause, SpanlessEq};
+use rustc_hir::{BinOpKind, Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks comparison chains written with `if` that can be
+ /// rewritten with `match` and `cmp`.
+ ///
+ /// ### Why is this bad?
+ /// `if` is not guaranteed to be exhaustive and conditionals can get
+ /// repetitive
+ ///
+ /// ### Known problems
+ /// The match statement may be slower due to the compiler
+ /// not inlining the call to cmp. See issue [#5354](https://github.com/rust-lang/rust-clippy/issues/5354)
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// # fn a() {}
+ /// # fn b() {}
+ /// # fn c() {}
+ /// fn f(x: u8, y: u8) {
+ /// if x > y {
+ /// a()
+ /// } else if x < y {
+ /// b()
+ /// } else {
+ /// c()
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// use std::cmp::Ordering;
+ /// # fn a() {}
+ /// # fn b() {}
+ /// # fn c() {}
+ /// fn f(x: u8, y: u8) {
+ /// match x.cmp(&y) {
+ /// Ordering::Greater => a(),
+ /// Ordering::Less => b(),
+ /// Ordering::Equal => c()
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub COMPARISON_CHAIN,
+ style,
+ "`if`s that can be rewritten with `match` and `cmp`"
+}
+
+declare_lint_pass!(ComparisonChain => [COMPARISON_CHAIN]);
+
+impl<'tcx> LateLintPass<'tcx> for ComparisonChain {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ // We only care about the top-most `if` in the chain
+ if is_else_clause(cx.tcx, expr) {
+ return;
+ }
+
+ if in_constant(cx, expr.hir_id) {
+ return;
+ }
+
+ // Check that there exists at least one explicit else condition
+ let (conds, _) = if_sequence(expr);
+ if conds.len() < 2 {
+ return;
+ }
+
+ for cond in conds.windows(2) {
+ if let (&ExprKind::Binary(ref kind1, lhs1, rhs1), &ExprKind::Binary(ref kind2, lhs2, rhs2)) =
+ (&cond[0].kind, &cond[1].kind)
+ {
+ if !kind_is_cmp(kind1.node) || !kind_is_cmp(kind2.node) {
+ return;
+ }
+
+ // Check that both sets of operands are equal
+ let mut spanless_eq = SpanlessEq::new(cx);
+ let same_fixed_operands = spanless_eq.eq_expr(lhs1, lhs2) && spanless_eq.eq_expr(rhs1, rhs2);
+ let same_transposed_operands = spanless_eq.eq_expr(lhs1, rhs2) && spanless_eq.eq_expr(rhs1, lhs2);
+
+ if !same_fixed_operands && !same_transposed_operands {
+ return;
+ }
+
+ // Check that if the operation is the same, either it's not `==` or the operands are transposed
+ if kind1.node == kind2.node {
+ if kind1.node == BinOpKind::Eq {
+ return;
+ }
+ if !same_transposed_operands {
+ return;
+ }
+ }
+
+ // Check that the type being compared implements `core::cmp::Ord`
+ let ty = cx.typeck_results().expr_ty(lhs1);
++ let is_ord = cx
++ .tcx
++ .get_diagnostic_item(sym::Ord)
++ .map_or(false, |id| implements_trait(cx, ty, id, &[]));
+
+ if !is_ord {
+ return;
+ }
+ } else {
+ // We only care about comparison chains
+ return;
+ }
+ }
+ span_lint_and_help(
+ cx,
+ COMPARISON_CHAIN,
+ expr.span,
+ "`if` chain can be rewritten with `match`",
+ None,
+ "consider rewriting the `if` chain to use `cmp` and `match`",
+ );
+ }
+}
+
+fn kind_is_cmp(kind: BinOpKind) -> bool {
+ matches!(kind, BinOpKind::Lt | BinOpKind::Gt | BinOpKind::Eq)
+}
--- /dev/null
- use clippy_utils::numeric_literal;
+use clippy_utils::diagnostics::span_lint_hir_and_then;
- Body, Expr, ExprKind, HirId, Lit, Stmt, StmtKind,
+use clippy_utils::source::snippet_opt;
++use clippy_utils::{get_parent_node, numeric_literal};
+use if_chain::if_chain;
+use rustc_ast::ast::{LitFloatType, LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::{
+ intravisit::{walk_expr, walk_stmt, Visitor},
- let mut visitor = NumericFallbackVisitor::new(cx);
++ Body, Expr, ExprKind, HirId, ItemKind, Lit, Node, Stmt, StmtKind,
+};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::{
+ lint::in_external_macro,
+ ty::{self, FloatTy, IntTy, PolyFnSig, Ty},
+};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use std::iter;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of unconstrained numeric literals which may cause default numeric fallback in type
+ /// inference.
+ ///
+ /// Default numeric fallback means that if numeric types have not yet been bound to concrete
+ /// types at the end of type inference, then integer type is bound to `i32`, and similarly
+ /// floating type is bound to `f64`.
+ ///
+ /// See [RFC0212](https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md) for more information about the fallback.
+ ///
+ /// ### Why is this bad?
+ /// For those who are very careful about types, default numeric fallback
+ /// can be a pitfall that cause unexpected runtime behavior.
+ ///
+ /// ### Known problems
+ /// This lint can only be allowed at the function level or above.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let i = 10;
+ /// let f = 1.23;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let i = 10i32;
+ /// let f = 1.23f64;
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub DEFAULT_NUMERIC_FALLBACK,
+ restriction,
+ "usage of unconstrained numeric literals which may cause default numeric fallback."
+}
+
+declare_lint_pass!(DefaultNumericFallback => [DEFAULT_NUMERIC_FALLBACK]);
+
+impl<'tcx> LateLintPass<'tcx> for DefaultNumericFallback {
+ fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
- ty_bounds: Vec<TyBound<'tcx>>,
++ let is_parent_const = if let Some(Node::Item(item)) = get_parent_node(cx.tcx, body.id().hir_id) {
++ matches!(item.kind, ItemKind::Const(..))
++ } else {
++ false
++ };
++ let mut visitor = NumericFallbackVisitor::new(cx, is_parent_const);
+ visitor.visit_body(body);
+ }
+}
+
+struct NumericFallbackVisitor<'a, 'tcx> {
+ /// Stack manages type bound of exprs. The top element holds current expr type.
- fn new(cx: &'a LateContext<'tcx>) -> Self {
++ ty_bounds: Vec<ExplicitTyBound>,
+
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> NumericFallbackVisitor<'a, 'tcx> {
- ty_bounds: vec![TyBound::Nothing],
++ fn new(cx: &'a LateContext<'tcx>, is_parent_const: bool) -> Self {
+ Self {
- if let Some(ty_bound) = self.ty_bounds.last();
++ ty_bounds: vec![if is_parent_const {
++ ExplicitTyBound(true)
++ } else {
++ ExplicitTyBound(false)
++ }],
+ cx,
+ }
+ }
+
+ /// Check whether a passed literal has potential to cause fallback or not.
+ fn check_lit(&self, lit: &Lit, lit_ty: Ty<'tcx>, emit_hir_id: HirId) {
+ if_chain! {
+ if !in_external_macro(self.cx.sess(), lit.span);
- if !ty_bound.is_numeric();
++ if matches!(self.ty_bounds.last(), Some(ExplicitTyBound(false)));
+ if matches!(lit.node,
+ LitKind::Int(_, LitIntType::Unsuffixed) | LitKind::Float(_, LitFloatType::Unsuffixed));
- self.ty_bounds.push(TyBound::Ty(*bound));
+ then {
+ let (suffix, is_float) = match lit_ty.kind() {
+ ty::Int(IntTy::I32) => ("i32", false),
+ ty::Float(FloatTy::F64) => ("f64", true),
+ // Default numeric fallback never results in other types.
+ _ => return,
+ };
+
+ let src = if let Some(src) = snippet_opt(self.cx, lit.span) {
+ src
+ } else {
+ match lit.node {
+ LitKind::Int(src, _) => format!("{src}"),
+ LitKind::Float(src, _) => format!("{src}"),
+ _ => return,
+ }
+ };
+ let sugg = numeric_literal::format(&src, Some(suffix), is_float);
+ span_lint_hir_and_then(
+ self.cx,
+ DEFAULT_NUMERIC_FALLBACK,
+ emit_hir_id,
+ lit.span,
+ "default numeric fallback might occur",
+ |diag| {
+ diag.span_suggestion(lit.span, "consider adding suffix", sugg, Applicability::MaybeIncorrect);
+ }
+ );
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for NumericFallbackVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ match &expr.kind {
+ ExprKind::Call(func, args) => {
+ if let Some(fn_sig) = fn_sig_opt(self.cx, func.hir_id) {
+ for (expr, bound) in iter::zip(*args, fn_sig.skip_binder().inputs()) {
+ // Push found arg type, then visit arg.
- self.ty_bounds.push(TyBound::Ty(*bound));
++ self.ty_bounds.push((*bound).into());
+ self.visit_expr(expr);
+ self.ty_bounds.pop();
+ }
+ return;
+ }
+ },
+
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ if let Some(def_id) = self.cx.typeck_results().type_dependent_def_id(expr.hir_id) {
+ let fn_sig = self.cx.tcx.fn_sig(def_id).skip_binder();
+ for (expr, bound) in iter::zip(std::iter::once(*receiver).chain(args.iter()), fn_sig.inputs()) {
- self.ty_bounds.push(TyBound::Nothing);
++ self.ty_bounds.push((*bound).into());
+ self.visit_expr(expr);
+ self.ty_bounds.pop();
+ }
+ return;
+ }
+ },
+
+ ExprKind::Struct(_, fields, base) => {
+ let ty = self.cx.typeck_results().expr_ty(expr);
+ if_chain! {
+ if let Some(adt_def) = ty.ty_adt_def();
+ if adt_def.is_struct();
+ if let Some(variant) = adt_def.variants().iter().next();
+ then {
+ let fields_def = &variant.fields;
+
+ // Push field type then visit each field expr.
+ for field in fields.iter() {
+ let bound =
+ fields_def
+ .iter()
+ .find_map(|f_def| {
+ if f_def.ident(self.cx.tcx) == field.ident
+ { Some(self.cx.tcx.type_of(f_def.did)) }
+ else { None }
+ });
+ self.ty_bounds.push(bound.into());
+ self.visit_expr(field.expr);
+ self.ty_bounds.pop();
+ }
+
+ // Visit base with no bound.
+ if let Some(base) = base {
- StmtKind::Local(local) => {
- if local.ty.is_some() {
- self.ty_bounds.push(TyBound::Any);
- } else {
- self.ty_bounds.push(TyBound::Nothing);
- }
- },
++ self.ty_bounds.push(ExplicitTyBound(false));
+ self.visit_expr(base);
+ self.ty_bounds.pop();
+ }
+ return;
+ }
+ }
+ },
+
+ ExprKind::Lit(lit) => {
+ let ty = self.cx.typeck_results().expr_ty(expr);
+ self.check_lit(lit, ty, expr.hir_id);
+ return;
+ },
+
+ _ => {},
+ }
+
+ walk_expr(self, expr);
+ }
+
+ fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
+ match stmt.kind {
- _ => self.ty_bounds.push(TyBound::Nothing),
++ // we cannot check the exact type since it's a hir::Ty which does not implement `is_numeric`
++ StmtKind::Local(local) => self.ty_bounds.push(ExplicitTyBound(local.ty.is_some())),
+
- enum TyBound<'tcx> {
- Any,
- Ty(Ty<'tcx>),
- Nothing,
- }
++ _ => self.ty_bounds.push(ExplicitTyBound(false)),
+ }
+
+ walk_stmt(self, stmt);
+ self.ty_bounds.pop();
+ }
+}
+
+fn fn_sig_opt<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<PolyFnSig<'tcx>> {
+ let node_ty = cx.typeck_results().node_type_opt(hir_id)?;
+ // We can't use `Ty::fn_sig` because it automatically performs substs, this may result in FNs.
+ match node_ty.kind() {
+ ty::FnDef(def_id, _) => Some(cx.tcx.fn_sig(*def_id)),
+ ty::FnPtr(fn_sig) => Some(*fn_sig),
+ _ => None,
+ }
+}
+
++/// Wrapper around a `bool` to make the meaning of the value clearer
+#[derive(Debug, Clone, Copy)]
- impl<'tcx> TyBound<'tcx> {
- fn is_numeric(self) -> bool {
- match self {
- TyBound::Any => true,
- TyBound::Ty(t) => t.is_numeric(),
- TyBound::Nothing => false,
- }
++struct ExplicitTyBound(pub bool);
+
- impl<'tcx> From<Option<Ty<'tcx>>> for TyBound<'tcx> {
++impl<'tcx> From<Ty<'tcx>> for ExplicitTyBound {
++ fn from(v: Ty<'tcx>) -> Self {
++ Self(v.is_numeric())
+ }
+}
+
- match v {
- Some(t) => TyBound::Ty(t),
- None => TyBound::Nothing,
- }
++impl<'tcx> From<Option<Ty<'tcx>>> for ExplicitTyBound {
+ fn from(v: Option<Ty<'tcx>>) -> Self {
++ Self(v.map_or(false, Ty::is_numeric))
+ }
+}
--- /dev/null
- self as hir, def_id::DefId, BindingAnnotation, Body, BodyId, BorrowKind, Closure, Expr, ExprKind, FnRetTy,
- GenericArg, HirId, ImplItem, ImplItemKind, Item, ItemKind, Local, MatchSource, Mutability, Node, Pat, PatKind,
- Path, QPath, TraitItem, TraitItemKind, TyKind, UnOp,
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
++use clippy_utils::mir::{enclosing_mir, expr_local, local_assignments, used_exactly_once, PossibleBorrowerMap};
+use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
+use clippy_utils::sugg::has_enclosing_paren;
+use clippy_utils::ty::{expr_sig, is_copy, peel_mid_ty_refs, ty_sig, variant_of_res};
+use clippy_utils::{
+ fn_def_id, get_parent_expr, get_parent_expr_for_hir, is_lint_allowed, meets_msrv, msrvs, path_to_local,
+ walk_to_expr_usage,
+};
+use rustc_ast::util::parser::{PREC_POSTFIX, PREC_PREFIX};
+use rustc_data_structures::fx::FxIndexMap;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_ty, Visitor};
+use rustc_hir::{
- impl_lint_pass!(Dereferencing => [
++ self as hir,
++ def_id::{DefId, LocalDefId},
++ BindingAnnotation, Body, BodyId, BorrowKind, Closure, Expr, ExprKind, FnRetTy, GenericArg, HirId, ImplItem,
++ ImplItemKind, Item, ItemKind, Local, MatchSource, Mutability, Node, Pat, PatKind, Path, QPath, TraitItem,
++ TraitItemKind, TyKind, UnOp,
+};
+use rustc_index::bit_set::BitSet;
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::mir::{Rvalue, StatementKind};
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
+use rustc_middle::ty::{
+ self, Binder, BoundVariableKind, EarlyBinder, FnSig, GenericArgKind, List, ParamTy, PredicateKind,
+ ProjectionPredicate, Ty, TyCtxt, TypeVisitable, TypeckResults,
+};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{symbol::sym, Span, Symbol, DUMMY_SP};
+use rustc_trait_selection::infer::InferCtxtExt as _;
+use rustc_trait_selection::traits::{query::evaluate_obligation::InferCtxtExt as _, Obligation, ObligationCause};
+use std::collections::VecDeque;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit `deref()` or `deref_mut()` method calls.
+ ///
+ /// ### Why is this bad?
+ /// Dereferencing by `&*x` or `&mut *x` is clearer and more concise,
+ /// when not part of a method chain.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::ops::Deref;
+ /// let a: &mut String = &mut String::from("foo");
+ /// let b: &str = a.deref();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let a: &mut String = &mut String::from("foo");
+ /// let b = &*a;
+ /// ```
+ ///
+ /// This lint excludes:
+ /// ```rust,ignore
+ /// let _ = d.unwrap().deref();
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub EXPLICIT_DEREF_METHODS,
+ pedantic,
+ "Explicit use of deref or deref_mut method while not in a method chain."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for address of operations (`&`) that are going to
+ /// be dereferenced immediately by the compiler.
+ ///
+ /// ### Why is this bad?
+ /// Suggests that the receiver of the expression borrows
+ /// the expression.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn fun(_a: &i32) {}
+ ///
+ /// let x: &i32 = &&&&&&5;
+ /// fun(&x);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # fn fun(_a: &i32) {}
+ /// let x: &i32 = &5;
+ /// fun(x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEEDLESS_BORROW,
+ style,
+ "taking a reference that is going to be automatically dereferenced"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `ref` bindings which create a reference to a reference.
+ ///
+ /// ### Why is this bad?
+ /// The address-of operator at the use site is clearer about the need for a reference.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some("");
+ /// if let Some(ref x) = x {
+ /// // use `x` here
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = Some("");
+ /// if let Some(x) = x {
+ /// // use `&x` here
+ /// }
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub REF_BINDING_TO_REFERENCE,
+ pedantic,
+ "`ref` binding to a reference"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for dereferencing expressions which would be covered by auto-deref.
+ ///
+ /// ### Why is this bad?
+ /// This unnecessarily complicates the code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = String::new();
+ /// let y: &str = &*x;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = String::new();
+ /// let y: &str = &x;
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub EXPLICIT_AUTO_DEREF,
+ complexity,
+ "dereferencing when the compiler would automatically dereference"
+}
+
- pub struct Dereferencing {
++impl_lint_pass!(Dereferencing<'_> => [
+ EXPLICIT_DEREF_METHODS,
+ NEEDLESS_BORROW,
+ REF_BINDING_TO_REFERENCE,
+ EXPLICIT_AUTO_DEREF,
+]);
+
+#[derive(Default)]
- impl Dereferencing {
++pub struct Dereferencing<'tcx> {
+ state: Option<(State, StateData)>,
+
+ // While parsing a `deref` method call in ufcs form, the path to the function is itself an
+ // expression. This is to store the id of that expression so it can be skipped when
+ // `check_expr` is called for it.
+ skip_expr: Option<HirId>,
+
+ /// The body the first local was found in. Used to emit lints when the traversal of the body has
+ /// been finished. Note we can't lint at the end of every body as they can be nested within each
+ /// other.
+ current_body: Option<BodyId>,
+
+ /// The list of locals currently being checked by the lint.
+ /// If the value is `None`, then the binding has been seen as a ref pattern, but is not linted.
+ /// This is needed for or patterns where one of the branches can be linted, but another can not
+ /// be.
+ ///
+ /// e.g. `m!(x) | Foo::Bar(ref x)`
+ ref_locals: FxIndexMap<HirId, Option<RefPat>>,
+
++ /// Stack of (body owner, `PossibleBorrowerMap`) pairs. Used by
++ /// `needless_borrow_impl_arg_position` to determine when a borrowed expression can instead
++ /// be moved.
++ possible_borrowers: Vec<(LocalDefId, PossibleBorrowerMap<'tcx, 'tcx>)>,
++
+ // `IntoIterator` for arrays requires Rust 1.53.
+ msrv: Option<RustcVersion>,
+}
+
- impl<'tcx> LateLintPass<'tcx> for Dereferencing {
++impl<'tcx> Dereferencing<'tcx> {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self {
+ msrv,
+ ..Dereferencing::default()
+ }
+ }
+}
+
+#[derive(Debug)]
+struct StateData {
+ /// Span of the top level expression
+ span: Span,
+ hir_id: HirId,
+ position: Position,
+}
+
+#[derive(Debug)]
+struct DerefedBorrow {
+ count: usize,
+ msg: &'static str,
+ snip_expr: Option<HirId>,
+}
+
+#[derive(Debug)]
+enum State {
+ // Any number of deref method calls.
+ DerefMethod {
+ // The number of calls in a sequence which changed the referenced type
+ ty_changed_count: usize,
+ is_final_ufcs: bool,
+ /// The required mutability
+ target_mut: Mutability,
+ },
+ DerefedBorrow(DerefedBorrow),
+ ExplicitDeref {
+ mutability: Option<Mutability>,
+ },
+ ExplicitDerefField {
+ name: Symbol,
+ },
+ Reborrow {
+ mutability: Mutability,
+ },
+ Borrow {
+ mutability: Mutability,
+ },
+}
+
+// A reference operation considered by this lint pass
+enum RefOp {
+ Method(Mutability),
+ Deref,
+ AddrOf(Mutability),
+}
+
+struct RefPat {
+ /// Whether every usage of the binding is dereferenced.
+ always_deref: bool,
+ /// The spans of all the ref bindings for this local.
+ spans: Vec<Span>,
+ /// The applicability of this suggestion.
+ app: Applicability,
+ /// All the replacements which need to be made.
+ replacements: Vec<(Span, String)>,
+ /// The [`HirId`] that the lint should be emitted at.
+ hir_id: HirId,
+}
+
- let (position, adjustments) = walk_parents(cx, expr, self.msrv);
++impl<'tcx> LateLintPass<'tcx> for Dereferencing<'tcx> {
+ #[expect(clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Skip path expressions from deref calls. e.g. `Deref::deref(e)`
+ if Some(expr.hir_id) == self.skip_expr.take() {
+ return;
+ }
+
+ if let Some(local) = path_to_local(expr) {
+ self.check_local_usage(cx, expr, local);
+ }
+
+ // Stop processing sub expressions when a macro call is seen
+ if expr.span.from_expansion() {
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ }
+
+ let typeck = cx.typeck_results();
+ let (kind, sub_expr) = if let Some(x) = try_parse_ref_op(cx.tcx, typeck, expr) {
+ x
+ } else {
+ // The whole chain of reference operations has been seen
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ };
+
+ match (self.state.take(), kind) {
+ (None, kind) => {
+ let expr_ty = typeck.expr_ty(expr);
- needless_borrow_impl_arg_position(cx, parent, i, *param_ty, e, precedence, msrv)
++ let (position, adjustments) = walk_parents(cx, &mut self.possible_borrowers, expr, self.msrv);
+ match kind {
+ RefOp::Deref => {
+ if let Position::FieldAccess {
+ name,
+ of_union: false,
+ } = position
+ && !ty_contains_field(typeck.expr_ty(sub_expr), name)
+ {
+ self.state = Some((
+ State::ExplicitDerefField { name },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable() {
+ self.state = Some((
+ State::ExplicitDeref { mutability: None },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ }
+ }
+ RefOp::Method(target_mut)
+ if !is_lint_allowed(cx, EXPLICIT_DEREF_METHODS, expr.hir_id)
+ && position.lint_explicit_deref() =>
+ {
+ let ty_changed_count = usize::from(!deref_method_same_type(expr_ty, typeck.expr_ty(sub_expr)));
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count,
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
+ target_mut,
+ },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position
+ },
+ ));
+ },
+ RefOp::AddrOf(mutability) => {
+ // Find the number of times the borrow is auto-derefed.
+ let mut iter = adjustments.iter();
+ let mut deref_count = 0usize;
+ let next_adjust = loop {
+ match iter.next() {
+ Some(adjust) => {
+ if !matches!(adjust.kind, Adjust::Deref(_)) {
+ break Some(adjust);
+ } else if !adjust.target.is_ref() {
+ deref_count += 1;
+ break iter.next();
+ }
+ deref_count += 1;
+ },
+ None => break None,
+ };
+ };
+
+ // Determine the required number of references before any can be removed. In all cases the
+ // reference made by the current expression will be removed. After that there are four cases to
+ // handle.
+ //
+ // 1. Auto-borrow will trigger in the current position, so no further references are required.
+ // 2. Auto-deref ends at a reference, or the underlying type, so one extra needs to be left to
+ // handle the automatically inserted re-borrow.
+ // 3. Auto-deref hits a user-defined `Deref` impl, so at least one reference needs to exist to
+ // start auto-deref.
+ // 4. If the chain of non-user-defined derefs ends with a mutable re-borrow, and re-borrow
+ // adjustments will not be inserted automatically, then leave one further reference to avoid
+ // moving a mutable borrow.
+ // e.g.
+ // fn foo<T>(x: &mut Option<&mut T>, y: &mut T) {
+ // let x = match x {
+ // // Removing the borrow will cause `x` to be moved
+ // Some(x) => &mut *x,
+ // None => y
+ // };
+ // }
+ let deref_msg =
+ "this expression creates a reference which is immediately dereferenced by the compiler";
+ let borrow_msg = "this expression borrows a value the compiler would automatically borrow";
+ let impl_msg = "the borrowed expression implements the required traits";
+
+ let (required_refs, msg, snip_expr) = if position.can_auto_borrow() {
+ (1, if deref_count == 1 { borrow_msg } else { deref_msg }, None)
+ } else if let Position::ImplArg(hir_id) = position {
+ (0, impl_msg, Some(hir_id))
+ } else if let Some(&Adjust::Borrow(AutoBorrow::Ref(_, mutability))) =
+ next_adjust.map(|a| &a.kind)
+ {
+ if matches!(mutability, AutoBorrowMutability::Mut { .. }) && !position.is_reborrow_stable()
+ {
+ (3, deref_msg, None)
+ } else {
+ (2, deref_msg, None)
+ }
+ } else {
+ (2, deref_msg, None)
+ };
+
+ if deref_count >= required_refs {
+ self.state = Some((
+ State::DerefedBorrow(DerefedBorrow {
+ // One of the required refs is for the current borrow expression, the remaining ones
+ // can't be removed without breaking the code. See earlier comment.
+ count: deref_count - required_refs,
+ msg,
+ snip_expr,
+ }),
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable()
+ // Auto-deref doesn't combine with other adjustments
+ && next_adjust.map_or(true, |a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
+ && iter.all(|a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
+ {
+ self.state = Some((
+ State::Borrow { mutability },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position
+ },
+ ));
+ }
+ },
+ RefOp::Method(..) => (),
+ }
+ },
+ (
+ Some((
+ State::DerefMethod {
+ target_mut,
+ ty_changed_count,
+ ..
+ },
+ data,
+ )),
+ RefOp::Method(_),
+ ) => {
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count: if deref_method_same_type(typeck.expr_ty(expr), typeck.expr_ty(sub_expr)) {
+ ty_changed_count
+ } else {
+ ty_changed_count + 1
+ },
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
+ target_mut,
+ },
+ data,
+ ));
+ },
+ (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf(_)) if state.count != 0 => {
+ self.state = Some((
+ State::DerefedBorrow(DerefedBorrow {
+ count: state.count - 1,
+ ..state
+ }),
+ data,
+ ));
+ },
+ (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf(mutability)) => {
+ let position = data.position;
+ report(cx, expr, State::DerefedBorrow(state), data);
+ if position.is_deref_stable() {
+ self.state = Some((
+ State::Borrow { mutability },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position,
+ },
+ ));
+ }
+ },
+ (Some((State::DerefedBorrow(state), data)), RefOp::Deref) => {
+ let position = data.position;
+ report(cx, expr, State::DerefedBorrow(state), data);
+ if let Position::FieldAccess{name, ..} = position
+ && !ty_contains_field(typeck.expr_ty(sub_expr), name)
+ {
+ self.state = Some((
+ State::ExplicitDerefField { name },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable() {
+ self.state = Some((
+ State::ExplicitDeref { mutability: None },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ }
+ },
+
+ (Some((State::Borrow { mutability }, data)), RefOp::Deref) => {
+ if typeck.expr_ty(sub_expr).is_ref() {
+ self.state = Some((State::Reborrow { mutability }, data));
+ } else {
+ self.state = Some((
+ State::ExplicitDeref {
+ mutability: Some(mutability),
+ },
+ data,
+ ));
+ }
+ },
+ (Some((State::Reborrow { mutability }, data)), RefOp::Deref) => {
+ self.state = Some((
+ State::ExplicitDeref {
+ mutability: Some(mutability),
+ },
+ data,
+ ));
+ },
+ (state @ Some((State::ExplicitDeref { .. }, _)), RefOp::Deref) => {
+ self.state = state;
+ },
+ (Some((State::ExplicitDerefField { name }, data)), RefOp::Deref)
+ if !ty_contains_field(typeck.expr_ty(sub_expr), name) =>
+ {
+ self.state = Some((State::ExplicitDerefField { name }, data));
+ },
+
+ (Some((state, data)), _) => report(cx, expr, state, data),
+ }
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ if let PatKind::Binding(BindingAnnotation::REF, id, name, _) = pat.kind {
+ if let Some(opt_prev_pat) = self.ref_locals.get_mut(&id) {
+ // This binding id has been seen before. Add this pattern to the list of changes.
+ if let Some(prev_pat) = opt_prev_pat {
+ if pat.span.from_expansion() {
+ // Doesn't match the context of the previous pattern. Can't lint here.
+ *opt_prev_pat = None;
+ } else {
+ prev_pat.spans.push(pat.span);
+ prev_pat.replacements.push((
+ pat.span,
+ snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut prev_pat.app)
+ .0
+ .into(),
+ ));
+ }
+ }
+ return;
+ }
+
+ if_chain! {
+ if !pat.span.from_expansion();
+ if let ty::Ref(_, tam, _) = *cx.typeck_results().pat_ty(pat).kind();
+ // only lint immutable refs, because borrowed `&mut T` cannot be moved out
+ if let ty::Ref(_, _, Mutability::Not) = *tam.kind();
+ then {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut app).0;
+ self.current_body = self.current_body.or(cx.enclosing_body);
+ self.ref_locals.insert(
+ id,
+ Some(RefPat {
+ always_deref: true,
+ spans: vec![pat.span],
+ app,
+ replacements: vec![(pat.span, snip.into())],
+ hir_id: pat.hir_id,
+ }),
+ );
+ }
+ }
+ }
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
++ if self.possible_borrowers.last().map_or(false, |&(local_def_id, _)| {
++ local_def_id == cx.tcx.hir().body_owner_def_id(body.id())
++ }) {
++ self.possible_borrowers.pop();
++ }
++
+ if Some(body.id()) == self.current_body {
+ for pat in self.ref_locals.drain(..).filter_map(|(_, x)| x) {
+ let replacements = pat.replacements;
+ let app = pat.app;
+ let lint = if pat.always_deref {
+ NEEDLESS_BORROW
+ } else {
+ REF_BINDING_TO_REFERENCE
+ };
+ span_lint_hir_and_then(
+ cx,
+ lint,
+ pat.hir_id,
+ pat.spans,
+ "this pattern creates a reference to a reference",
+ |diag| {
+ diag.multipart_suggestion("try this", replacements, app);
+ },
+ );
+ }
+ self.current_body = None;
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+fn try_parse_ref_op<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ typeck: &'tcx TypeckResults<'_>,
+ expr: &'tcx Expr<'_>,
+) -> Option<(RefOp, &'tcx Expr<'tcx>)> {
+ let (def_id, arg) = match expr.kind {
+ ExprKind::MethodCall(_, arg, [], _) => (typeck.type_dependent_def_id(expr.hir_id)?, arg),
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(path),
+ hir_id,
+ ..
+ },
+ [arg],
+ ) => (typeck.qpath_res(path, *hir_id).opt_def_id()?, arg),
+ ExprKind::Unary(UnOp::Deref, sub_expr) if !typeck.expr_ty(sub_expr).is_unsafe_ptr() => {
+ return Some((RefOp::Deref, sub_expr));
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutability, sub_expr) => return Some((RefOp::AddrOf(mutability), sub_expr)),
+ _ => return None,
+ };
+ if tcx.is_diagnostic_item(sym::deref_method, def_id) {
+ Some((RefOp::Method(Mutability::Not), arg))
+ } else if tcx.trait_of_item(def_id)? == tcx.lang_items().deref_mut_trait()? {
+ Some((RefOp::Method(Mutability::Mut), arg))
+ } else {
+ None
+ }
+}
+
+// Checks whether the type for a deref call actually changed the type, not just the mutability of
+// the reference.
+fn deref_method_same_type<'tcx>(result_ty: Ty<'tcx>, arg_ty: Ty<'tcx>) -> bool {
+ match (result_ty.kind(), arg_ty.kind()) {
+ (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => result_ty == arg_ty,
+
+ // The result type for a deref method is always a reference
+ // Not matching the previous pattern means the argument type is not a reference
+ // This means that the type did change
+ _ => false,
+ }
+}
+
+/// The position of an expression relative to it's parent.
+#[derive(Clone, Copy, Debug)]
+enum Position {
+ MethodReceiver,
+ /// The method is defined on a reference type. e.g. `impl Foo for &T`
+ MethodReceiverRefImpl,
+ Callee,
+ ImplArg(HirId),
+ FieldAccess {
+ name: Symbol,
+ of_union: bool,
+ }, // union fields cannot be auto borrowed
+ Postfix,
+ Deref,
+ /// Any other location which will trigger auto-deref to a specific time.
+ /// Contains the precedence of the parent expression and whether the target type is sized.
+ DerefStable(i8, bool),
+ /// Any other location which will trigger auto-reborrowing.
+ /// Contains the precedence of the parent expression.
+ ReborrowStable(i8),
+ /// Contains the precedence of the parent expression.
+ Other(i8),
+}
+impl Position {
+ fn is_deref_stable(self) -> bool {
+ matches!(self, Self::DerefStable(..))
+ }
+
+ fn is_reborrow_stable(self) -> bool {
+ matches!(self, Self::DerefStable(..) | Self::ReborrowStable(_))
+ }
+
+ fn can_auto_borrow(self) -> bool {
+ matches!(
+ self,
+ Self::MethodReceiver | Self::FieldAccess { of_union: false, .. } | Self::Callee
+ )
+ }
+
+ fn lint_explicit_deref(self) -> bool {
+ matches!(self, Self::Other(_) | Self::DerefStable(..) | Self::ReborrowStable(_))
+ }
+
+ fn precedence(self) -> i8 {
+ match self {
+ Self::MethodReceiver
+ | Self::MethodReceiverRefImpl
+ | Self::Callee
+ | Self::FieldAccess { .. }
+ | Self::Postfix => PREC_POSTFIX,
+ Self::ImplArg(_) | Self::Deref => PREC_PREFIX,
+ Self::DerefStable(p, _) | Self::ReborrowStable(p) | Self::Other(p) => p,
+ }
+ }
+}
+
+/// Walks up the parent expressions attempting to determine both how stable the auto-deref result
+/// is, and which adjustments will be applied to it. Note this will not consider auto-borrow
+/// locations as those follow different rules.
+#[expect(clippy::too_many_lines)]
+fn walk_parents<'tcx>(
+ cx: &LateContext<'tcx>,
++ possible_borrowers: &mut Vec<(LocalDefId, PossibleBorrowerMap<'tcx, 'tcx>)>,
+ e: &'tcx Expr<'_>,
+ msrv: Option<RustcVersion>,
+) -> (Position, &'tcx [Adjustment<'tcx>]) {
+ let mut adjustments = [].as_slice();
+ let mut precedence = 0i8;
+ let ctxt = e.span.ctxt();
+ let position = walk_to_expr_usage(cx, e, &mut |parent, child_id| {
+ // LocalTableInContext returns the wrong lifetime, so go use `expr_adjustments` instead.
+ if adjustments.is_empty() && let Node::Expr(e) = cx.tcx.hir().get(child_id) {
+ adjustments = cx.typeck_results().expr_adjustments(e);
+ }
+ match parent {
+ Node::Local(Local { ty: Some(ty), span, .. }) if span.ctxt() == ctxt => {
+ Some(binding_ty_auto_deref_stability(cx, ty, precedence, List::empty()))
+ },
+ Node::Item(&Item {
+ kind: ItemKind::Static(..) | ItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let ty = cx.tcx.type_of(def_id.def_id);
+ Some(ty_auto_deref_stability(cx, ty, precedence).position_for_result(cx))
+ },
+
+ Node::Item(&Item {
+ kind: ItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let output = cx
+ .tcx
+ .erase_late_bound_regions(cx.tcx.fn_sig(def_id.to_def_id()).output());
+ Some(ty_auto_deref_stability(cx, output, precedence).position_for_result(cx))
+ },
+
+ Node::ExprField(field) if field.span.ctxt() == ctxt => match get_parent_expr_for_hir(cx, field.hir_id) {
+ Some(Expr {
+ hir_id,
+ kind: ExprKind::Struct(path, ..),
+ ..
+ }) => variant_of_res(cx, cx.qpath_res(path, *hir_id))
+ .and_then(|variant| variant.fields.iter().find(|f| f.name == field.ident.name))
+ .map(|field_def| {
+ ty_auto_deref_stability(cx, cx.tcx.type_of(field_def.did), precedence).position_for_arg()
+ }),
+ _ => None,
+ },
+
+ Node::Expr(parent) if parent.span.ctxt() == ctxt => match parent.kind {
+ ExprKind::Ret(_) => {
+ let owner_id = cx.tcx.hir().body_owner(cx.enclosing_body.unwrap());
+ Some(
+ if let Node::Expr(
+ closure_expr @ Expr {
+ kind: ExprKind::Closure(closure),
+ ..
+ },
+ ) = cx.tcx.hir().get(owner_id)
+ {
+ closure_result_position(cx, closure, cx.typeck_results().expr_ty(closure_expr), precedence)
+ } else {
+ let output = cx
+ .tcx
+ .erase_late_bound_regions(cx.tcx.fn_sig(cx.tcx.hir().local_def_id(owner_id)).output());
+ ty_auto_deref_stability(cx, output, precedence).position_for_result(cx)
+ },
+ )
+ },
+ ExprKind::Closure(closure) => Some(closure_result_position(
+ cx,
+ closure,
+ cx.typeck_results().expr_ty(parent),
+ precedence,
+ )),
+ ExprKind::Call(func, _) if func.hir_id == child_id => {
+ (child_id == e.hir_id).then_some(Position::Callee)
+ },
+ ExprKind::Call(func, args) => args
+ .iter()
+ .position(|arg| arg.hir_id == child_id)
+ .zip(expr_sig(cx, func))
+ .and_then(|(i, sig)| {
+ sig.input_with_hir(i).map(|(hir_ty, ty)| match hir_ty {
+ // Type inference for closures can depend on how they're called. Only go by the explicit
+ // types here.
+ Some(hir_ty) => binding_ty_auto_deref_stability(cx, hir_ty, precedence, ty.bound_vars()),
+ None => {
+ if let ty::Param(param_ty) = ty.skip_binder().kind() {
- needless_borrow_impl_arg_position(cx, parent, i + 1, *param_ty, e, precedence, msrv)
++ needless_borrow_impl_arg_position(
++ cx,
++ possible_borrowers,
++ parent,
++ i,
++ *param_ty,
++ e,
++ precedence,
++ msrv,
++ )
+ } else {
+ ty_auto_deref_stability(cx, cx.tcx.erase_late_bound_regions(ty), precedence)
+ .position_for_arg()
+ }
+ },
+ })
+ }),
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ let id = cx.typeck_results().type_dependent_def_id(parent.hir_id).unwrap();
+ if receiver.hir_id == child_id {
+ // Check for calls to trait methods where the trait is implemented on a reference.
+ // Two cases need to be handled:
+ // * `self` methods on `&T` will never have auto-borrow
+ // * `&self` methods on `&T` can have auto-borrow, but `&self` methods on `T` will take
+ // priority.
+ if e.hir_id != child_id {
+ return Some(Position::ReborrowStable(precedence))
+ } else if let Some(trait_id) = cx.tcx.trait_of_item(id)
+ && let arg_ty = cx.tcx.erase_regions(cx.typeck_results().expr_ty_adjusted(e))
+ && let ty::Ref(_, sub_ty, _) = *arg_ty.kind()
+ && let subs = match cx
+ .typeck_results()
+ .node_substs_opt(parent.hir_id)
+ .and_then(|subs| subs.get(1..))
+ {
+ Some(subs) => cx.tcx.mk_substs(subs.iter().copied()),
+ None => cx.tcx.mk_substs(std::iter::empty::<ty::subst::GenericArg<'_>>()),
+ } && let impl_ty = if cx.tcx.fn_sig(id).skip_binder().inputs()[0].is_ref() {
+ // Trait methods taking `&self`
+ sub_ty
+ } else {
+ // Trait methods taking `self`
+ arg_ty
+ } && impl_ty.is_ref()
+ && let infcx = cx.tcx.infer_ctxt().build()
+ && infcx
+ .type_implements_trait(trait_id, impl_ty, subs, cx.param_env)
+ .must_apply_modulo_regions()
+ {
+ return Some(Position::MethodReceiverRefImpl)
+ }
+ return Some(Position::MethodReceiver);
+ }
+ args.iter().position(|arg| arg.hir_id == child_id).map(|i| {
+ let ty = cx.tcx.fn_sig(id).skip_binder().inputs()[i + 1];
+ if let ty::Param(param_ty) = ty.kind() {
- let mut check_referent = |referent| {
++ needless_borrow_impl_arg_position(
++ cx,
++ possible_borrowers,
++ parent,
++ i + 1,
++ *param_ty,
++ e,
++ precedence,
++ msrv,
++ )
+ } else {
+ ty_auto_deref_stability(
+ cx,
+ cx.tcx.erase_late_bound_regions(cx.tcx.fn_sig(id).input(i + 1)),
+ precedence,
+ )
+ .position_for_arg()
+ }
+ })
+ },
+ ExprKind::Field(child, name) if child.hir_id == e.hir_id => Some(Position::FieldAccess {
+ name: name.name,
+ of_union: is_union(cx.typeck_results(), child),
+ }),
+ ExprKind::Unary(UnOp::Deref, child) if child.hir_id == e.hir_id => Some(Position::Deref),
+ ExprKind::Match(child, _, MatchSource::TryDesugar | MatchSource::AwaitDesugar)
+ | ExprKind::Index(child, _)
+ if child.hir_id == e.hir_id =>
+ {
+ Some(Position::Postfix)
+ },
+ _ if child_id == e.hir_id => {
+ precedence = parent.precedence().order();
+ None
+ },
+ _ => None,
+ },
+ _ => None,
+ }
+ })
+ .unwrap_or(Position::Other(precedence));
+ (position, adjustments)
+}
+
+fn is_union<'tcx>(typeck: &'tcx TypeckResults<'_>, path_expr: &'tcx Expr<'_>) -> bool {
+ typeck
+ .expr_ty_adjusted(path_expr)
+ .ty_adt_def()
+ .map_or(false, rustc_middle::ty::AdtDef::is_union)
+}
+
+fn closure_result_position<'tcx>(
+ cx: &LateContext<'tcx>,
+ closure: &'tcx Closure<'_>,
+ ty: Ty<'tcx>,
+ precedence: i8,
+) -> Position {
+ match closure.fn_decl.output {
+ FnRetTy::Return(hir_ty) => {
+ if let Some(sig) = ty_sig(cx, ty)
+ && let Some(output) = sig.output()
+ {
+ binding_ty_auto_deref_stability(cx, hir_ty, precedence, output.bound_vars())
+ } else {
+ Position::Other(precedence)
+ }
+ },
+ FnRetTy::DefaultReturn(_) => Position::Other(precedence),
+ }
+}
+
+// Checks the stability of auto-deref when assigned to a binding with the given explicit type.
+//
+// e.g.
+// let x = Box::new(Box::new(0u32));
+// let y1: &Box<_> = x.deref();
+// let y2: &Box<_> = &x;
+//
+// Here `y1` and `y2` would resolve to different types, so the type `&Box<_>` is not stable when
+// switching to auto-dereferencing.
+fn binding_ty_auto_deref_stability<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: &'tcx hir::Ty<'_>,
+ precedence: i8,
+ binder_args: &'tcx List<BoundVariableKind>,
+) -> Position {
+ let TyKind::Rptr(_, ty) = &ty.kind else {
+ return Position::Other(precedence);
+ };
+ let mut ty = ty;
+
+ loop {
+ break match ty.ty.kind {
+ TyKind::Rptr(_, ref ref_ty) => {
+ ty = ref_ty;
+ continue;
+ },
+ TyKind::Path(
+ QPath::TypeRelative(_, path)
+ | QPath::Resolved(
+ _,
+ Path {
+ segments: [.., path], ..
+ },
+ ),
+ ) => {
+ if let Some(args) = path.args
+ && args.args.iter().any(|arg| match arg {
+ GenericArg::Infer(_) => true,
+ GenericArg::Type(ty) => ty_contains_infer(ty),
+ _ => false,
+ })
+ {
+ Position::ReborrowStable(precedence)
+ } else {
+ Position::DerefStable(
+ precedence,
+ cx.tcx
+ .erase_late_bound_regions(Binder::bind_with_vars(
+ cx.typeck_results().node_type(ty.ty.hir_id),
+ binder_args,
+ ))
+ .is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
+ )
+ }
+ },
+ TyKind::Slice(_) => Position::DerefStable(precedence, false),
+ TyKind::Array(..) | TyKind::Ptr(_) | TyKind::BareFn(_) => Position::DerefStable(precedence, true),
+ TyKind::Never
+ | TyKind::Tup(_)
+ | TyKind::Path(_) => Position::DerefStable(
+ precedence,
+ cx.tcx
+ .erase_late_bound_regions(Binder::bind_with_vars(
+ cx.typeck_results().node_type(ty.ty.hir_id),
+ binder_args,
+ ))
+ .is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
+ ),
+ TyKind::OpaqueDef(..) | TyKind::Infer | TyKind::Typeof(..) | TyKind::TraitObject(..) | TyKind::Err => {
+ Position::ReborrowStable(precedence)
+ },
+ };
+ }
+}
+
+// Checks whether a type is inferred at some point.
+// e.g. `_`, `Box<_>`, `[_]`
+fn ty_contains_infer(ty: &hir::Ty<'_>) -> bool {
+ struct V(bool);
+ impl Visitor<'_> for V {
+ fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
+ if self.0
+ || matches!(
+ ty.kind,
+ TyKind::OpaqueDef(..) | TyKind::Infer | TyKind::Typeof(_) | TyKind::Err
+ )
+ {
+ self.0 = true;
+ } else {
+ walk_ty(self, ty);
+ }
+ }
+
+ fn visit_generic_arg(&mut self, arg: &GenericArg<'_>) {
+ if self.0 || matches!(arg, GenericArg::Infer(_)) {
+ self.0 = true;
+ } else if let GenericArg::Type(ty) = arg {
+ self.visit_ty(ty);
+ }
+ }
+ }
+ let mut v = V(false);
+ v.visit_ty(ty);
+ v.0
+}
+
+// Checks whether:
+// * child is an expression of the form `&e` in an argument position requiring an `impl Trait`
+// * `e`'s type implements `Trait` and is copyable
+// If the conditions are met, returns `Some(Position::ImplArg(..))`; otherwise, returns `None`.
+// The "is copyable" condition is to avoid the case where removing the `&` means `e` would have to
+// be moved, but it cannot be.
++#[expect(clippy::too_many_arguments)]
+fn needless_borrow_impl_arg_position<'tcx>(
+ cx: &LateContext<'tcx>,
++ possible_borrowers: &mut Vec<(LocalDefId, PossibleBorrowerMap<'tcx, 'tcx>)>,
+ parent: &Expr<'tcx>,
+ arg_index: usize,
+ param_ty: ParamTy,
+ mut expr: &Expr<'tcx>,
+ precedence: i8,
+ msrv: Option<RustcVersion>,
+) -> Position {
+ let destruct_trait_def_id = cx.tcx.lang_items().destruct_trait();
+ let sized_trait_def_id = cx.tcx.lang_items().sized_trait();
+
+ let Some(callee_def_id) = fn_def_id(cx, parent) else { return Position::Other(precedence) };
+ let fn_sig = cx.tcx.fn_sig(callee_def_id).skip_binder();
+ let substs_with_expr_ty = cx
+ .typeck_results()
+ .node_substs(if let ExprKind::Call(callee, _) = parent.kind {
+ callee.hir_id
+ } else {
+ parent.hir_id
+ });
+
+ let predicates = cx.tcx.param_env(callee_def_id).caller_bounds();
+ let projection_predicates = predicates
+ .iter()
+ .filter_map(|predicate| {
+ if let PredicateKind::Projection(projection_predicate) = predicate.kind().skip_binder() {
+ Some(projection_predicate)
+ } else {
+ None
+ }
+ })
+ .collect::<Vec<_>>();
+
+ let mut trait_with_ref_mut_self_method = false;
+
+ // If no traits were found, or only the `Destruct`, `Sized`, or `Any` traits were found, return.
+ if predicates
+ .iter()
+ .filter_map(|predicate| {
+ if let PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder()
+ && trait_predicate.trait_ref.self_ty() == param_ty.to_ty(cx.tcx)
+ {
+ Some(trait_predicate.trait_ref.def_id)
+ } else {
+ None
+ }
+ })
+ .inspect(|trait_def_id| {
+ trait_with_ref_mut_self_method |= has_ref_mut_self_method(cx, *trait_def_id);
+ })
+ .all(|trait_def_id| {
+ Some(trait_def_id) == destruct_trait_def_id
+ || Some(trait_def_id) == sized_trait_def_id
+ || cx.tcx.is_diagnostic_item(sym::Any, trait_def_id)
+ })
+ {
+ return Position::Other(precedence);
+ }
+
+ // `substs_with_referent_ty` can be constructed outside of `check_referent` because the same
+ // elements are modified each time `check_referent` is called.
+ let mut substs_with_referent_ty = substs_with_expr_ty.to_vec();
+
- if !is_copy(cx, referent_ty) {
++ let mut check_reference_and_referent = |reference, referent| {
+ let referent_ty = cx.typeck_results().expr_ty(referent);
+
- if !check_referent(referent) {
++ if !is_copy(cx, referent_ty)
++ && (referent_ty.has_significant_drop(cx.tcx, cx.param_env)
++ || !referent_used_exactly_once(cx, possible_borrowers, reference))
++ {
+ return false;
+ }
+
+ // https://github.com/rust-lang/rust-clippy/pull/9136#pullrequestreview-1037379321
+ if trait_with_ref_mut_self_method && !matches!(referent_ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
+ return false;
+ }
+
+ if !replace_types(
+ cx,
+ param_ty,
+ referent_ty,
+ fn_sig,
+ arg_index,
+ &projection_predicates,
+ &mut substs_with_referent_ty,
+ ) {
+ return false;
+ }
+
+ predicates.iter().all(|predicate| {
+ if let PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder()
+ && cx.tcx.is_diagnostic_item(sym::IntoIterator, trait_predicate.trait_ref.def_id)
+ && let ty::Param(param_ty) = trait_predicate.self_ty().kind()
+ && let GenericArgKind::Type(ty) = substs_with_referent_ty[param_ty.index as usize].unpack()
+ && ty.is_array()
+ && !meets_msrv(msrv, msrvs::ARRAY_INTO_ITERATOR)
+ {
+ return false;
+ }
+
+ let predicate = EarlyBinder(predicate).subst(cx.tcx, &substs_with_referent_ty);
+ let obligation = Obligation::new(ObligationCause::dummy(), cx.param_env, predicate);
+ let infcx = cx.tcx.infer_ctxt().build();
+ infcx.predicate_must_hold_modulo_regions(&obligation)
+ })
+ };
+
+ let mut needless_borrow = false;
+ while let ExprKind::AddrOf(_, _, referent) = expr.kind {
- impl Dereferencing {
- fn check_local_usage<'tcx>(&mut self, cx: &LateContext<'tcx>, e: &Expr<'tcx>, local: HirId) {
++ if !check_reference_and_referent(expr, referent) {
+ break;
+ }
+ expr = referent;
+ needless_borrow = true;
+ }
+
+ if needless_borrow {
+ Position::ImplArg(expr.hir_id)
+ } else {
+ Position::Other(precedence)
+ }
+}
+
+fn has_ref_mut_self_method(cx: &LateContext<'_>, trait_def_id: DefId) -> bool {
+ cx.tcx
+ .associated_items(trait_def_id)
+ .in_definition_order()
+ .any(|assoc_item| {
+ if assoc_item.fn_has_self_parameter {
+ let self_ty = cx.tcx.fn_sig(assoc_item.def_id).skip_binder().inputs()[0];
+ matches!(self_ty.kind(), ty::Ref(_, _, Mutability::Mut))
+ } else {
+ false
+ }
+ })
+}
+
++fn referent_used_exactly_once<'tcx>(
++ cx: &LateContext<'tcx>,
++ possible_borrowers: &mut Vec<(LocalDefId, PossibleBorrowerMap<'tcx, 'tcx>)>,
++ reference: &Expr<'tcx>,
++) -> bool {
++ let mir = enclosing_mir(cx.tcx, reference.hir_id);
++ if let Some(local) = expr_local(cx.tcx, reference)
++ && let [location] = *local_assignments(mir, local).as_slice()
++ && let Some(statement) = mir.basic_blocks[location.block].statements.get(location.statement_index)
++ && let StatementKind::Assign(box (_, Rvalue::Ref(_, _, place))) = statement.kind
++ && !place.has_deref()
++ {
++ let body_owner_local_def_id = cx.tcx.hir().enclosing_body_owner(reference.hir_id);
++ if possible_borrowers
++ .last()
++ .map_or(true, |&(local_def_id, _)| local_def_id != body_owner_local_def_id)
++ {
++ possible_borrowers.push((body_owner_local_def_id, PossibleBorrowerMap::new(cx, mir)));
++ }
++ let possible_borrower = &mut possible_borrowers.last_mut().unwrap().1;
++ // If `only_borrowers` were used here, the `copyable_iterator::warn` test would fail. The reason is
++ // that `PossibleBorrowerVisitor::visit_terminator` considers `place.local` a possible borrower of
++ // itself. See the comment in that method for an explanation as to why.
++ possible_borrower.bounded_borrowers(&[local], &[local, place.local], place.local, location)
++ && used_exactly_once(mir, place.local).unwrap_or(false)
++ } else {
++ false
++ }
++}
++
+// Iteratively replaces `param_ty` with `new_ty` in `substs`, and similarly for each resulting
+// projected type that is a type parameter. Returns `false` if replacing the types would have an
+// effect on the function signature beyond substituting `new_ty` for `param_ty`.
+// See: https://github.com/rust-lang/rust-clippy/pull/9136#discussion_r927212757
+fn replace_types<'tcx>(
+ cx: &LateContext<'tcx>,
+ param_ty: ParamTy,
+ new_ty: Ty<'tcx>,
+ fn_sig: FnSig<'tcx>,
+ arg_index: usize,
+ projection_predicates: &[ProjectionPredicate<'tcx>],
+ substs: &mut [ty::GenericArg<'tcx>],
+) -> bool {
+ let mut replaced = BitSet::new_empty(substs.len());
+
+ let mut deque = VecDeque::with_capacity(substs.len());
+ deque.push_back((param_ty, new_ty));
+
+ while let Some((param_ty, new_ty)) = deque.pop_front() {
+ // If `replaced.is_empty()`, then `param_ty` and `new_ty` are those initially passed in.
+ if !fn_sig
+ .inputs_and_output
+ .iter()
+ .enumerate()
+ .all(|(i, ty)| (replaced.is_empty() && i == arg_index) || !ty.contains(param_ty.to_ty(cx.tcx)))
+ {
+ return false;
+ }
+
+ substs[param_ty.index as usize] = ty::GenericArg::from(new_ty);
+
+ // The `replaced.insert(...)` check provides some protection against infinite loops.
+ if replaced.insert(param_ty.index) {
+ for projection_predicate in projection_predicates {
+ if projection_predicate.projection_ty.self_ty() == param_ty.to_ty(cx.tcx)
+ && let Some(term_ty) = projection_predicate.term.ty()
+ && let ty::Param(term_param_ty) = term_ty.kind()
+ {
+ let item_def_id = projection_predicate.projection_ty.item_def_id;
+ let assoc_item = cx.tcx.associated_item(item_def_id);
+ let projection = cx.tcx
+ .mk_projection(assoc_item.def_id, cx.tcx.mk_substs_trait(new_ty, &[]));
+
+ if let Ok(projected_ty) = cx.tcx.try_normalize_erasing_regions(cx.param_env, projection)
+ && substs[term_param_ty.index as usize] != ty::GenericArg::from(projected_ty)
+ {
+ deque.push_back((*term_param_ty, projected_ty));
+ }
+ }
+ }
+ }
+ }
+
+ true
+}
+
+struct TyPosition<'tcx> {
+ position: Position,
+ ty: Option<Ty<'tcx>>,
+}
+impl From<Position> for TyPosition<'_> {
+ fn from(position: Position) -> Self {
+ Self { position, ty: None }
+ }
+}
+impl<'tcx> TyPosition<'tcx> {
+ fn new_deref_stable_for_result(precedence: i8, ty: Ty<'tcx>) -> Self {
+ Self {
+ position: Position::ReborrowStable(precedence),
+ ty: Some(ty),
+ }
+ }
+ fn position_for_result(self, cx: &LateContext<'tcx>) -> Position {
+ match (self.position, self.ty) {
+ (Position::ReborrowStable(precedence), Some(ty)) => {
+ Position::DerefStable(precedence, ty.is_sized(cx.tcx.at(DUMMY_SP), cx.param_env))
+ },
+ (position, _) => position,
+ }
+ }
+ fn position_for_arg(self) -> Position {
+ self.position
+ }
+}
+
+// Checks whether a type is stable when switching to auto dereferencing,
+fn ty_auto_deref_stability<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, precedence: i8) -> TyPosition<'tcx> {
+ let ty::Ref(_, mut ty, _) = *ty.kind() else {
+ return Position::Other(precedence).into();
+ };
+
+ loop {
+ break match *ty.kind() {
+ ty::Ref(_, ref_ty, _) => {
+ ty = ref_ty;
+ continue;
+ },
+ ty::Param(_) => TyPosition::new_deref_stable_for_result(precedence, ty),
+ ty::Infer(_) | ty::Error(_) | ty::Bound(..) | ty::Opaque(..) | ty::Placeholder(_) | ty::Dynamic(..) => {
+ Position::ReborrowStable(precedence).into()
+ },
+ ty::Adt(..) if ty.has_placeholders() || ty.has_opaque_types() => {
+ Position::ReborrowStable(precedence).into()
+ },
+ ty::Adt(_, substs) if substs.has_non_region_param() => {
+ TyPosition::new_deref_stable_for_result(precedence, ty)
+ },
+ ty::Bool
+ | ty::Char
+ | ty::Int(_)
+ | ty::Uint(_)
+ | ty::Array(..)
+ | ty::Float(_)
+ | ty::RawPtr(..)
+ | ty::FnPtr(_) => Position::DerefStable(precedence, true).into(),
+ ty::Str | ty::Slice(..) => Position::DerefStable(precedence, false).into(),
+ ty::Adt(..)
+ | ty::Foreign(_)
+ | ty::FnDef(..)
+ | ty::Generator(..)
+ | ty::GeneratorWitness(..)
+ | ty::Closure(..)
+ | ty::Never
+ | ty::Tuple(_)
+ | ty::Projection(_) => Position::DerefStable(
+ precedence,
+ ty.is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
+ )
+ .into(),
+ };
+ }
+}
+
+fn ty_contains_field(ty: Ty<'_>, name: Symbol) -> bool {
+ if let ty::Adt(adt, _) = *ty.kind() {
+ adt.is_struct() && adt.all_fields().any(|f| f.name == name)
+ } else {
+ false
+ }
+}
+
+#[expect(clippy::needless_pass_by_value, clippy::too_many_lines)]
+fn report<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, state: State, data: StateData) {
+ match state {
+ State::DerefMethod {
+ ty_changed_count,
+ is_final_ufcs,
+ target_mut,
+ } => {
+ let mut app = Applicability::MachineApplicable;
+ let (expr_str, expr_is_macro_call) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
+ let ty = cx.typeck_results().expr_ty(expr);
+ let (_, ref_count) = peel_mid_ty_refs(ty);
+ let deref_str = if ty_changed_count >= ref_count && ref_count != 0 {
+ // a deref call changing &T -> &U requires two deref operators the first time
+ // this occurs. One to remove the reference, a second to call the deref impl.
+ "*".repeat(ty_changed_count + 1)
+ } else {
+ "*".repeat(ty_changed_count)
+ };
+ let addr_of_str = if ty_changed_count < ref_count {
+ // Check if a reborrow from &mut T -> &T is required.
+ if target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
+ "&*"
+ } else {
+ ""
+ }
+ } else if target_mut == Mutability::Mut {
+ "&mut "
+ } else {
+ "&"
+ };
+
+ let expr_str = if !expr_is_macro_call && is_final_ufcs && expr.precedence().order() < PREC_PREFIX {
+ format!("({expr_str})")
+ } else {
+ expr_str.into_owned()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ EXPLICIT_DEREF_METHODS,
+ data.span,
+ match target_mut {
+ Mutability::Not => "explicit `deref` method call",
+ Mutability::Mut => "explicit `deref_mut` method call",
+ },
+ "try this",
+ format!("{addr_of_str}{deref_str}{expr_str}"),
+ app,
+ );
+ },
+ State::DerefedBorrow(state) => {
+ let mut app = Applicability::MachineApplicable;
+ let snip_expr = state.snip_expr.map_or(expr, |hir_id| cx.tcx.hir().expect_expr(hir_id));
+ let (snip, snip_is_macro) = snippet_with_context(cx, snip_expr.span, data.span.ctxt(), "..", &mut app);
+ span_lint_hir_and_then(cx, NEEDLESS_BORROW, data.hir_id, data.span, state.msg, |diag| {
+ let calls_field = matches!(expr.kind, ExprKind::Field(..)) && matches!(data.position, Position::Callee);
+ let sugg = if !snip_is_macro
+ && !has_enclosing_paren(&snip)
+ && (expr.precedence().order() < data.position.precedence() || calls_field)
+ {
+ format!("({snip})")
+ } else {
+ snip.into()
+ };
+ diag.span_suggestion(data.span, "change this to", sugg, app);
+ });
+ },
+ State::ExplicitDeref { mutability } => {
+ if matches!(
+ expr.kind,
+ ExprKind::Block(..)
+ | ExprKind::ConstBlock(_)
+ | ExprKind::If(..)
+ | ExprKind::Loop(..)
+ | ExprKind::Match(..)
+ ) && matches!(data.position, Position::DerefStable(_, true))
+ {
+ // Rustc bug: auto deref doesn't work on block expression when targeting sized types.
+ return;
+ }
+
+ let (prefix, precedence) = if let Some(mutability) = mutability
+ && !cx.typeck_results().expr_ty(expr).is_ref()
+ {
+ let prefix = match mutability {
+ Mutability::Not => "&",
+ Mutability::Mut => "&mut ",
+ };
+ (prefix, 0)
+ } else {
+ ("", data.position.precedence())
+ };
+ span_lint_hir_and_then(
+ cx,
+ EXPLICIT_AUTO_DEREF,
+ data.hir_id,
+ data.span,
+ "deref which would be done by auto-deref",
+ |diag| {
+ let mut app = Applicability::MachineApplicable;
+ let (snip, snip_is_macro) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
+ let sugg =
+ if !snip_is_macro && expr.precedence().order() < precedence && !has_enclosing_paren(&snip) {
+ format!("{prefix}({snip})")
+ } else {
+ format!("{prefix}{snip}")
+ };
+ diag.span_suggestion(data.span, "try this", sugg, app);
+ },
+ );
+ },
+ State::ExplicitDerefField { .. } => {
+ if matches!(
+ expr.kind,
+ ExprKind::Block(..)
+ | ExprKind::ConstBlock(_)
+ | ExprKind::If(..)
+ | ExprKind::Loop(..)
+ | ExprKind::Match(..)
+ ) && matches!(data.position, Position::DerefStable(_, true))
+ {
+ // Rustc bug: auto deref doesn't work on block expression when targeting sized types.
+ return;
+ }
+
+ span_lint_hir_and_then(
+ cx,
+ EXPLICIT_AUTO_DEREF,
+ data.hir_id,
+ data.span,
+ "deref which would be done by auto-deref",
+ |diag| {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app).0;
+ diag.span_suggestion(data.span, "try this", snip.into_owned(), app);
+ },
+ );
+ },
+ State::Borrow { .. } | State::Reborrow { .. } => (),
+ }
+}
+
++impl<'tcx> Dereferencing<'tcx> {
++ fn check_local_usage(&mut self, cx: &LateContext<'tcx>, e: &Expr<'tcx>, local: HirId) {
+ if let Some(outer_pat) = self.ref_locals.get_mut(&local) {
+ if let Some(pat) = outer_pat {
+ // Check for auto-deref
+ if !matches!(
+ cx.typeck_results().expr_adjustments(e),
+ [
+ Adjustment {
+ kind: Adjust::Deref(_),
+ ..
+ },
+ Adjustment {
+ kind: Adjust::Deref(_),
+ ..
+ },
+ ..
+ ]
+ ) {
+ match get_parent_expr(cx, e) {
+ // Field accesses are the same no matter the number of references.
+ Some(Expr {
+ kind: ExprKind::Field(..),
+ ..
+ }) => (),
+ Some(&Expr {
+ span,
+ kind: ExprKind::Unary(UnOp::Deref, _),
+ ..
+ }) if !span.from_expansion() => {
+ // Remove explicit deref.
+ let snip = snippet_with_context(cx, e.span, span.ctxt(), "..", &mut pat.app).0;
+ pat.replacements.push((span, snip.into()));
+ },
+ Some(parent) if !parent.span.from_expansion() => {
+ // Double reference might be needed at this point.
+ if parent.precedence().order() == PREC_POSTFIX {
+ // Parentheses would be needed here, don't lint.
+ *outer_pat = None;
+ } else {
+ pat.always_deref = false;
+ let snip = snippet_with_context(cx, e.span, parent.span.ctxt(), "..", &mut pat.app).0;
+ pat.replacements.push((e.span, format!("&{snip}")));
+ }
+ },
+ _ if !e.span.from_expansion() => {
+ // Double reference might be needed at this point.
+ pat.always_deref = false;
+ let snip = snippet_with_applicability(cx, e.span, "..", &mut pat.app);
+ pat.replacements.push((e.span, format!("&{snip}")));
+ },
+ // Edge case for macros. The span of the identifier will usually match the context of the
+ // binding, but not if the identifier was created in a macro. e.g. `concat_idents` and proc
+ // macros
+ _ => *outer_pat = None,
+ }
+ }
+ }
+ }
+ }
+}
--- /dev/null
- let copy_id = match cx.tcx.lang_items().copy_trait() {
- Some(id) => id,
- None => return,
- };
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_note, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::paths;
+use clippy_utils::ty::{implements_trait, implements_trait_with_env, is_copy};
+use clippy_utils::{is_lint_allowed, match_def_path};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
+use rustc_hir::intravisit::{walk_expr, walk_fn, walk_item, FnKind, Visitor};
+use rustc_hir::{
+ self as hir, BlockCheckMode, BodyId, Constness, Expr, ExprKind, FnDecl, HirId, Impl, Item, ItemKind, UnsafeSource,
+ Unsafety,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::nested_filter;
+use rustc_middle::traits::Reveal;
+use rustc_middle::ty::{
+ self, Binder, BoundConstness, GenericParamDefKind, ImplPolarity, ParamEnv, PredicateKind, TraitPredicate, TraitRef,
+ Ty, TyCtxt,
+};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for deriving `Hash` but implementing `PartialEq`
+ /// explicitly or vice versa.
+ ///
+ /// ### Why is this bad?
+ /// The implementation of these traits must agree (for
+ /// example for use with `HashMap`) so it’s probably a bad idea to use a
+ /// default-generated `Hash` implementation with an explicitly defined
+ /// `PartialEq`. In particular, the following must hold for any type:
+ ///
+ /// ```text
+ /// k1 == k2 ⇒ hash(k1) == hash(k2)
+ /// ```
+ ///
+ /// ### Example
+ /// ```ignore
+ /// #[derive(Hash)]
+ /// struct Foo;
+ ///
+ /// impl PartialEq for Foo {
+ /// ...
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DERIVE_HASH_XOR_EQ,
+ correctness,
+ "deriving `Hash` but implementing `PartialEq` explicitly"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for deriving `Ord` but implementing `PartialOrd`
+ /// explicitly or vice versa.
+ ///
+ /// ### Why is this bad?
+ /// The implementation of these traits must agree (for
+ /// example for use with `sort`) so it’s probably a bad idea to use a
+ /// default-generated `Ord` implementation with an explicitly defined
+ /// `PartialOrd`. In particular, the following must hold for any type
+ /// implementing `Ord`:
+ ///
+ /// ```text
+ /// k1.cmp(&k2) == k1.partial_cmp(&k2).unwrap()
+ /// ```
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// #[derive(Ord, PartialEq, Eq)]
+ /// struct Foo;
+ ///
+ /// impl PartialOrd for Foo {
+ /// ...
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust,ignore
+ /// #[derive(PartialEq, Eq)]
+ /// struct Foo;
+ ///
+ /// impl PartialOrd for Foo {
+ /// fn partial_cmp(&self, other: &Foo) -> Option<Ordering> {
+ /// Some(self.cmp(other))
+ /// }
+ /// }
+ ///
+ /// impl Ord for Foo {
+ /// ...
+ /// }
+ /// ```
+ /// or, if you don't need a custom ordering:
+ /// ```rust,ignore
+ /// #[derive(Ord, PartialOrd, PartialEq, Eq)]
+ /// struct Foo;
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub DERIVE_ORD_XOR_PARTIAL_ORD,
+ correctness,
+ "deriving `Ord` but implementing `PartialOrd` explicitly"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit `Clone` implementations for `Copy`
+ /// types.
+ ///
+ /// ### Why is this bad?
+ /// To avoid surprising behavior, these traits should
+ /// agree and the behavior of `Copy` cannot be overridden. In almost all
+ /// situations a `Copy` type should have a `Clone` implementation that does
+ /// nothing more than copy the object, which is what `#[derive(Copy, Clone)]`
+ /// gets you.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// #[derive(Copy)]
+ /// struct Foo;
+ ///
+ /// impl Clone for Foo {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXPL_IMPL_CLONE_ON_COPY,
+ pedantic,
+ "implementing `Clone` explicitly on `Copy` types"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for deriving `serde::Deserialize` on a type that
+ /// has methods using `unsafe`.
+ ///
+ /// ### Why is this bad?
+ /// Deriving `serde::Deserialize` will create a constructor
+ /// that may violate invariants hold by another constructor.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// use serde::Deserialize;
+ ///
+ /// #[derive(Deserialize)]
+ /// pub struct Foo {
+ /// // ..
+ /// }
+ ///
+ /// impl Foo {
+ /// pub fn new() -> Self {
+ /// // setup here ..
+ /// }
+ ///
+ /// pub unsafe fn parts() -> (&str, &str) {
+ /// // assumes invariants hold
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub UNSAFE_DERIVE_DESERIALIZE,
+ pedantic,
+ "deriving `serde::Deserialize` on a type that has methods using `unsafe`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for types that derive `PartialEq` and could implement `Eq`.
+ ///
+ /// ### Why is this bad?
+ /// If a type `T` derives `PartialEq` and all of its members implement `Eq`,
+ /// then `T` can always implement `Eq`. Implementing `Eq` allows `T` to be used
+ /// in APIs that require `Eq` types. It also allows structs containing `T` to derive
+ /// `Eq` themselves.
+ ///
+ /// ### Example
+ /// ```rust
+ /// #[derive(PartialEq)]
+ /// struct Foo {
+ /// i_am_eq: i32,
+ /// i_am_eq_too: Vec<String>,
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// #[derive(PartialEq, Eq)]
+ /// struct Foo {
+ /// i_am_eq: i32,
+ /// i_am_eq_too: Vec<String>,
+ /// }
+ /// ```
+ #[clippy::version = "1.63.0"]
+ pub DERIVE_PARTIAL_EQ_WITHOUT_EQ,
+ nursery,
+ "deriving `PartialEq` on a type that can implement `Eq`, without implementing `Eq`"
+}
+
+declare_lint_pass!(Derive => [
+ EXPL_IMPL_CLONE_ON_COPY,
+ DERIVE_HASH_XOR_EQ,
+ DERIVE_ORD_XOR_PARTIAL_ORD,
+ UNSAFE_DERIVE_DESERIALIZE,
+ DERIVE_PARTIAL_EQ_WITHOUT_EQ
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Derive {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if let ItemKind::Impl(Impl {
+ of_trait: Some(ref trait_ref),
+ ..
+ }) = item.kind
+ {
+ let ty = cx.tcx.type_of(item.def_id);
+ let is_automatically_derived = cx.tcx.has_attr(item.def_id.to_def_id(), sym::automatically_derived);
+
+ check_hash_peq(cx, item.span, trait_ref, ty, is_automatically_derived);
+ check_ord_partial_ord(cx, item.span, trait_ref, ty, is_automatically_derived);
+
+ if is_automatically_derived {
+ check_unsafe_derive_deserialize(cx, item, trait_ref, ty);
+ check_partial_eq_without_eq(cx, item.span, trait_ref, ty);
+ } else {
+ check_copy_clone(cx, item, trait_ref, ty);
+ }
+ }
+ }
+}
+
+/// Implementation of the `DERIVE_HASH_XOR_EQ` lint.
+fn check_hash_peq<'tcx>(
+ cx: &LateContext<'tcx>,
+ span: Span,
+ trait_ref: &hir::TraitRef<'_>,
+ ty: Ty<'tcx>,
+ hash_is_automatically_derived: bool,
+) {
+ if_chain! {
+ if let Some(peq_trait_def_id) = cx.tcx.lang_items().eq_trait();
+ if let Some(def_id) = trait_ref.trait_def_id();
+ if cx.tcx.is_diagnostic_item(sym::Hash, def_id);
+ then {
+ // Look for the PartialEq implementations for `ty`
+ cx.tcx.for_each_relevant_impl(peq_trait_def_id, ty, |impl_id| {
+ let peq_is_automatically_derived = cx.tcx.has_attr(impl_id, sym::automatically_derived);
+
+ if peq_is_automatically_derived == hash_is_automatically_derived {
+ return;
+ }
+
+ let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
+
+ // Only care about `impl PartialEq<Foo> for Foo`
+ // For `impl PartialEq<B> for A, input_types is [A, B]
+ if trait_ref.substs.type_at(1) == ty {
+ let mess = if peq_is_automatically_derived {
+ "you are implementing `Hash` explicitly but have derived `PartialEq`"
+ } else {
+ "you are deriving `Hash` but have implemented `PartialEq` explicitly"
+ };
+
+ span_lint_and_then(
+ cx,
+ DERIVE_HASH_XOR_EQ,
+ span,
+ mess,
+ |diag| {
+ if let Some(local_def_id) = impl_id.as_local() {
+ let hir_id = cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
+ diag.span_note(
+ cx.tcx.hir().span(hir_id),
+ "`PartialEq` implemented here"
+ );
+ }
+ }
+ );
+ }
+ });
+ }
+ }
+}
+
+/// Implementation of the `DERIVE_ORD_XOR_PARTIAL_ORD` lint.
+fn check_ord_partial_ord<'tcx>(
+ cx: &LateContext<'tcx>,
+ span: Span,
+ trait_ref: &hir::TraitRef<'_>,
+ ty: Ty<'tcx>,
+ ord_is_automatically_derived: bool,
+) {
+ if_chain! {
+ if let Some(ord_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Ord);
+ if let Some(partial_ord_trait_def_id) = cx.tcx.lang_items().partial_ord_trait();
+ if let Some(def_id) = &trait_ref.trait_def_id();
+ if *def_id == ord_trait_def_id;
+ then {
+ // Look for the PartialOrd implementations for `ty`
+ cx.tcx.for_each_relevant_impl(partial_ord_trait_def_id, ty, |impl_id| {
+ let partial_ord_is_automatically_derived = cx.tcx.has_attr(impl_id, sym::automatically_derived);
+
+ if partial_ord_is_automatically_derived == ord_is_automatically_derived {
+ return;
+ }
+
+ let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
+
+ // Only care about `impl PartialOrd<Foo> for Foo`
+ // For `impl PartialOrd<B> for A, input_types is [A, B]
+ if trait_ref.substs.type_at(1) == ty {
+ let mess = if partial_ord_is_automatically_derived {
+ "you are implementing `Ord` explicitly but have derived `PartialOrd`"
+ } else {
+ "you are deriving `Ord` but have implemented `PartialOrd` explicitly"
+ };
+
+ span_lint_and_then(
+ cx,
+ DERIVE_ORD_XOR_PARTIAL_ORD,
+ span,
+ mess,
+ |diag| {
+ if let Some(local_def_id) = impl_id.as_local() {
+ let hir_id = cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
+ diag.span_note(
+ cx.tcx.hir().span(hir_id),
+ "`PartialOrd` implemented here"
+ );
+ }
+ }
+ );
+ }
+ });
+ }
+ }
+}
+
+/// Implementation of the `EXPL_IMPL_CLONE_ON_COPY` lint.
+fn check_copy_clone<'tcx>(cx: &LateContext<'tcx>, item: &Item<'_>, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
+ let clone_id = match cx.tcx.lang_items().clone_trait() {
+ Some(id) if trait_ref.trait_def_id() == Some(id) => id,
+ _ => return,
+ };
++ let Some(copy_id) = cx.tcx.lang_items().copy_trait() else { return };
+ let (ty_adt, ty_subs) = match *ty.kind() {
+ // Unions can't derive clone.
+ ty::Adt(adt, subs) if !adt.is_union() => (adt, subs),
+ _ => return,
+ };
+ // If the current self type doesn't implement Copy (due to generic constraints), search to see if
+ // there's a Copy impl for any instance of the adt.
+ if !is_copy(cx, ty) {
+ if ty_subs.non_erasable_generics().next().is_some() {
+ let has_copy_impl = cx.tcx.all_local_trait_impls(()).get(©_id).map_or(false, |impls| {
+ impls
+ .iter()
+ .any(|&id| matches!(cx.tcx.type_of(id).kind(), ty::Adt(adt, _) if ty_adt.did() == adt.did()))
+ });
+ if !has_copy_impl {
+ return;
+ }
+ } else {
+ return;
+ }
+ }
+ // Derive constrains all generic types to requiring Clone. Check if any type is not constrained for
+ // this impl.
+ if ty_subs.types().any(|ty| !implements_trait(cx, ty, clone_id, &[])) {
+ return;
+ }
+
+ span_lint_and_note(
+ cx,
+ EXPL_IMPL_CLONE_ON_COPY,
+ item.span,
+ "you are implementing `Clone` explicitly on a `Copy` type",
+ Some(item.span),
+ "consider deriving `Clone` or removing `Copy`",
+ );
+}
+
+/// Implementation of the `UNSAFE_DERIVE_DESERIALIZE` lint.
+fn check_unsafe_derive_deserialize<'tcx>(
+ cx: &LateContext<'tcx>,
+ item: &Item<'_>,
+ trait_ref: &hir::TraitRef<'_>,
+ ty: Ty<'tcx>,
+) {
+ fn has_unsafe<'tcx>(cx: &LateContext<'tcx>, item: &'tcx Item<'_>) -> bool {
+ let mut visitor = UnsafeVisitor { cx, has_unsafe: false };
+ walk_item(&mut visitor, item);
+ visitor.has_unsafe
+ }
+
+ if_chain! {
+ if let Some(trait_def_id) = trait_ref.trait_def_id();
+ if match_def_path(cx, trait_def_id, &paths::SERDE_DESERIALIZE);
+ if let ty::Adt(def, _) = ty.kind();
+ if let Some(local_def_id) = def.did().as_local();
+ let adt_hir_id = cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
+ if !is_lint_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id);
+ if cx.tcx.inherent_impls(def.did())
+ .iter()
+ .map(|imp_did| cx.tcx.hir().expect_item(imp_did.expect_local()))
+ .any(|imp| has_unsafe(cx, imp));
+ then {
+ span_lint_and_help(
+ cx,
+ UNSAFE_DERIVE_DESERIALIZE,
+ item.span,
+ "you are deriving `serde::Deserialize` on a type that has methods using `unsafe`",
+ None,
+ "consider implementing `serde::Deserialize` manually. See https://serde.rs/impl-deserialize.html"
+ );
+ }
+ }
+}
+
+struct UnsafeVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ has_unsafe: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for UnsafeVisitor<'_, 'tcx> {
+ type NestedFilter = nested_filter::All;
+
+ fn visit_fn(&mut self, kind: FnKind<'tcx>, decl: &'tcx FnDecl<'_>, body_id: BodyId, _: Span, id: HirId) {
+ if self.has_unsafe {
+ return;
+ }
+
+ if_chain! {
+ if let Some(header) = kind.header();
+ if header.unsafety == Unsafety::Unsafe;
+ then {
+ self.has_unsafe = true;
+ }
+ }
+
+ walk_fn(self, kind, decl, body_id, id);
+ }
+
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if self.has_unsafe {
+ return;
+ }
+
+ if let ExprKind::Block(block, _) = expr.kind {
+ if block.rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided) {
+ self.has_unsafe = true;
+ }
+ }
+
+ walk_expr(self, expr);
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
+
+/// Implementation of the `DERIVE_PARTIAL_EQ_WITHOUT_EQ` lint.
+fn check_partial_eq_without_eq<'tcx>(cx: &LateContext<'tcx>, span: Span, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
+ if_chain! {
+ if let ty::Adt(adt, substs) = ty.kind();
+ if cx.tcx.visibility(adt.did()).is_public();
+ if let Some(eq_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Eq);
+ if let Some(def_id) = trait_ref.trait_def_id();
+ if cx.tcx.is_diagnostic_item(sym::PartialEq, def_id);
+ let param_env = param_env_for_derived_eq(cx.tcx, adt.did(), eq_trait_def_id);
+ if !implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, &[]);
+ // If all of our fields implement `Eq`, we can implement `Eq` too
+ if adt
+ .all_fields()
+ .map(|f| f.ty(cx.tcx, substs))
+ .all(|ty| implements_trait_with_env(cx.tcx, param_env, ty, eq_trait_def_id, &[]));
+ then {
+ span_lint_and_sugg(
+ cx,
+ DERIVE_PARTIAL_EQ_WITHOUT_EQ,
+ span.ctxt().outer_expn_data().call_site,
+ "you are deriving `PartialEq` and can implement `Eq`",
+ "consider deriving `Eq` as well",
+ "PartialEq, Eq".to_string(),
+ Applicability::MachineApplicable,
+ )
+ }
+ }
+}
+
+/// Creates the `ParamEnv` used for the give type's derived `Eq` impl.
+fn param_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) -> ParamEnv<'_> {
+ // Initial map from generic index to param def.
+ // Vec<(param_def, needs_eq)>
+ let mut params = tcx
+ .generics_of(did)
+ .params
+ .iter()
+ .map(|p| (p, matches!(p.kind, GenericParamDefKind::Type { .. })))
+ .collect::<Vec<_>>();
+
+ let ty_predicates = tcx.predicates_of(did).predicates;
+ for (p, _) in ty_predicates {
+ if let PredicateKind::Trait(p) = p.kind().skip_binder()
+ && p.trait_ref.def_id == eq_trait_id
+ && let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
+ && p.constness == BoundConstness::NotConst
+ {
+ // Flag types which already have an `Eq` bound.
+ params[self_ty.index as usize].1 = false;
+ }
+ }
+
+ ParamEnv::new(
+ tcx.mk_predicates(ty_predicates.iter().map(|&(p, _)| p).chain(
+ params.iter().filter(|&&(_, needs_eq)| needs_eq).map(|&(param, _)| {
+ tcx.mk_predicate(Binder::dummy(PredicateKind::Trait(TraitPredicate {
+ trait_ref: TraitRef::new(
+ eq_trait_id,
+ tcx.mk_substs(std::iter::once(tcx.mk_param_from_def(param))),
+ ),
+ constness: BoundConstness::NotConst,
+ polarity: ImplPolarity::Positive,
+ })))
+ }),
+ )),
+ Reveal::UserFacing,
+ Constness::NotConst,
+ )
+}
--- /dev/null
- let def_id = match uncalled_path.or_else(|| fn_def_id(cx, expr)) {
- Some(def_id) => def_id,
- None => return,
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::{fn_def_id, get_parent_expr, path_def_id};
+
+use rustc_hir::def::{Namespace, Res};
+use rustc_hir::def_id::DefIdMap;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+use crate::utils::conf;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Denies the configured methods and functions in clippy.toml
+ ///
+ /// Note: Even though this lint is warn-by-default, it will only trigger if
+ /// methods are defined in the clippy.toml file.
+ ///
+ /// ### Why is this bad?
+ /// Some methods are undesirable in certain contexts, and it's beneficial to
+ /// lint for them as needed.
+ ///
+ /// ### Example
+ /// An example clippy.toml configuration:
+ /// ```toml
+ /// # clippy.toml
+ /// disallowed-methods = [
+ /// # Can use a string as the path of the disallowed method.
+ /// "std::boxed::Box::new",
+ /// # Can also use an inline table with a `path` key.
+ /// { path = "std::time::Instant::now" },
+ /// # When using an inline table, can add a `reason` for why the method
+ /// # is disallowed.
+ /// { path = "std::vec::Vec::leak", reason = "no leaking memory" },
+ /// ]
+ /// ```
+ ///
+ /// ```rust,ignore
+ /// // Example code where clippy issues a warning
+ /// let xs = vec![1, 2, 3, 4];
+ /// xs.leak(); // Vec::leak is disallowed in the config.
+ /// // The diagnostic contains the message "no leaking memory".
+ ///
+ /// let _now = Instant::now(); // Instant::now is disallowed in the config.
+ ///
+ /// let _box = Box::new(3); // Box::new is disallowed in the config.
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// // Example code which does not raise clippy warning
+ /// let mut xs = Vec::new(); // Vec::new is _not_ disallowed in the config.
+ /// xs.push(123); // Vec::push is _not_ disallowed in the config.
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub DISALLOWED_METHODS,
+ style,
+ "use of a disallowed method call"
+}
+
+#[derive(Clone, Debug)]
+pub struct DisallowedMethods {
+ conf_disallowed: Vec<conf::DisallowedPath>,
+ disallowed: DefIdMap<usize>,
+}
+
+impl DisallowedMethods {
+ pub fn new(conf_disallowed: Vec<conf::DisallowedPath>) -> Self {
+ Self {
+ conf_disallowed,
+ disallowed: DefIdMap::default(),
+ }
+ }
+}
+
+impl_lint_pass!(DisallowedMethods => [DISALLOWED_METHODS]);
+
+impl<'tcx> LateLintPass<'tcx> for DisallowedMethods {
+ fn check_crate(&mut self, cx: &LateContext<'_>) {
+ for (index, conf) in self.conf_disallowed.iter().enumerate() {
+ let segs: Vec<_> = conf.path().split("::").collect();
+ if let Res::Def(_, id) = clippy_utils::def_path_res(cx, &segs, Some(Namespace::ValueNS)) {
+ self.disallowed.insert(id, index);
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ let uncalled_path = if let Some(parent) = get_parent_expr(cx, expr)
+ && let ExprKind::Call(receiver, _) = parent.kind
+ && receiver.hir_id == expr.hir_id
+ {
+ None
+ } else {
+ path_def_id(cx, expr)
+ };
++ let Some(def_id) = uncalled_path.or_else(|| fn_def_id(cx, expr)) else {
++ return
+ };
+ let conf = match self.disallowed.get(&def_id) {
+ Some(&index) => &self.conf_disallowed[index],
+ None => return,
+ };
+ let msg = format!("use of a disallowed method `{}`", conf.path());
+ span_lint_and_then(cx, DISALLOWED_METHODS, expr.span, &msg, |diag| {
+ if let Some(reason) = conf.reason() {
+ diag.note(&format!("{reason} (from clippy.toml)"));
+ }
+ });
+ }
+}
--- /dev/null
- let (cond_expr, then_expr, else_expr) = match higher::If::hir(expr) {
- Some(higher::If { cond, then, r#else }) => (cond, then, r#else),
- _ => return,
+use clippy_utils::higher;
+use clippy_utils::{
+ can_move_expr_to_closure_no_visit,
+ diagnostics::span_lint_and_sugg,
+ is_expr_final_block_expr, is_expr_used_or_unified, match_def_path, paths, peel_hir_expr_while,
+ source::{reindent_multiline, snippet_indent, snippet_with_applicability, snippet_with_context},
+ SpanlessEq,
+};
+use core::fmt::Write;
+use rustc_errors::Applicability;
+use rustc_hir::{
+ hir_id::HirIdSet,
+ intravisit::{walk_expr, Visitor},
+ Block, Expr, ExprKind, Guard, HirId, Let, Pat, Stmt, StmtKind, UnOp,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{Span, SyntaxContext, DUMMY_SP};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for uses of `contains_key` + `insert` on `HashMap`
+ /// or `BTreeMap`.
+ ///
+ /// ### Why is this bad?
+ /// Using `entry` is more efficient.
+ ///
+ /// ### Known problems
+ /// The suggestion may have type inference errors in some cases. e.g.
+ /// ```rust
+ /// let mut map = std::collections::HashMap::new();
+ /// let _ = if !map.contains_key(&0) {
+ /// map.insert(0, 0)
+ /// } else {
+ /// None
+ /// };
+ /// ```
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashMap;
+ /// # let mut map = HashMap::new();
+ /// # let k = 1;
+ /// # let v = 1;
+ /// if !map.contains_key(&k) {
+ /// map.insert(k, v);
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::collections::HashMap;
+ /// # let mut map = HashMap::new();
+ /// # let k = 1;
+ /// # let v = 1;
+ /// map.entry(k).or_insert(v);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MAP_ENTRY,
+ perf,
+ "use of `contains_key` followed by `insert` on a `HashMap` or `BTreeMap`"
+}
+
+declare_lint_pass!(HashMapPass => [MAP_ENTRY]);
+
+impl<'tcx> LateLintPass<'tcx> for HashMapPass {
+ #[expect(clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
- let (map_ty, contains_expr) = match try_parse_contains(cx, cond_expr) {
- Some(x) => x,
- None => return,
++ let Some(higher::If { cond: cond_expr, then: then_expr, r#else: else_expr }) = higher::If::hir(expr) else {
++ return
+ };
+
- let then_search = match find_insert_calls(cx, &contains_expr, then_expr) {
- Some(x) => x,
- None => return,
++ let Some((map_ty, contains_expr)) = try_parse_contains(cx, cond_expr) else {
++ return
+ };
+
- let else_search = match find_insert_calls(cx, &contains_expr, else_expr) {
- Some(search) => search,
- None => return,
++ let Some(then_search) = find_insert_calls(cx, &contains_expr, then_expr) else {
++ return
+ };
+
+ let mut app = Applicability::MachineApplicable;
+ let map_str = snippet_with_context(cx, contains_expr.map.span, contains_expr.call_ctxt, "..", &mut app).0;
+ let key_str = snippet_with_context(cx, contains_expr.key.span, contains_expr.call_ctxt, "..", &mut app).0;
+ let sugg = if let Some(else_expr) = else_expr {
++ let Some(else_search) = find_insert_calls(cx, &contains_expr, else_expr) else {
++ return;
+ };
+
+ if then_search.edits.is_empty() && else_search.edits.is_empty() {
+ // No insertions
+ return;
+ } else if then_search.edits.is_empty() || else_search.edits.is_empty() {
+ // if .. { insert } else { .. } or if .. { .. } else { insert }
+ let ((then_str, entry_kind), else_str) = match (else_search.edits.is_empty(), contains_expr.negated) {
+ (true, true) => (
+ then_search.snippet_vacant(cx, then_expr.span, &mut app),
+ snippet_with_applicability(cx, else_expr.span, "{ .. }", &mut app),
+ ),
+ (true, false) => (
+ then_search.snippet_occupied(cx, then_expr.span, &mut app),
+ snippet_with_applicability(cx, else_expr.span, "{ .. }", &mut app),
+ ),
+ (false, true) => (
+ else_search.snippet_occupied(cx, else_expr.span, &mut app),
+ snippet_with_applicability(cx, then_expr.span, "{ .. }", &mut app),
+ ),
+ (false, false) => (
+ else_search.snippet_vacant(cx, else_expr.span, &mut app),
+ snippet_with_applicability(cx, then_expr.span, "{ .. }", &mut app),
+ ),
+ };
+ format!(
+ "if let {}::{entry_kind} = {map_str}.entry({key_str}) {then_str} else {else_str}",
+ map_ty.entry_path(),
+ )
+ } else {
+ // if .. { insert } else { insert }
+ let ((then_str, then_entry), (else_str, else_entry)) = if contains_expr.negated {
+ (
+ then_search.snippet_vacant(cx, then_expr.span, &mut app),
+ else_search.snippet_occupied(cx, else_expr.span, &mut app),
+ )
+ } else {
+ (
+ then_search.snippet_occupied(cx, then_expr.span, &mut app),
+ else_search.snippet_vacant(cx, else_expr.span, &mut app),
+ )
+ };
+ let indent_str = snippet_indent(cx, expr.span);
+ let indent_str = indent_str.as_deref().unwrap_or("");
+ format!(
+ "match {map_str}.entry({key_str}) {{\n{indent_str} {entry}::{then_entry} => {}\n\
+ {indent_str} {entry}::{else_entry} => {}\n{indent_str}}}",
+ reindent_multiline(then_str.into(), true, Some(4 + indent_str.len())),
+ reindent_multiline(else_str.into(), true, Some(4 + indent_str.len())),
+ entry = map_ty.entry_path(),
+ )
+ }
+ } else {
+ if then_search.edits.is_empty() {
+ // no insertions
+ return;
+ }
+
+ // if .. { insert }
+ if !then_search.allow_insert_closure {
+ let (body_str, entry_kind) = if contains_expr.negated {
+ then_search.snippet_vacant(cx, then_expr.span, &mut app)
+ } else {
+ then_search.snippet_occupied(cx, then_expr.span, &mut app)
+ };
+ format!(
+ "if let {}::{entry_kind} = {map_str}.entry({key_str}) {body_str}",
+ map_ty.entry_path(),
+ )
+ } else if let Some(insertion) = then_search.as_single_insertion() {
+ let value_str = snippet_with_context(cx, insertion.value.span, then_expr.span.ctxt(), "..", &mut app).0;
+ if contains_expr.negated {
+ if insertion.value.can_have_side_effects() {
+ format!("{map_str}.entry({key_str}).or_insert_with(|| {value_str});")
+ } else {
+ format!("{map_str}.entry({key_str}).or_insert({value_str});")
+ }
+ } else {
+ // TODO: suggest using `if let Some(v) = map.get_mut(k) { .. }` here.
+ // This would need to be a different lint.
+ return;
+ }
+ } else {
+ let block_str = then_search.snippet_closure(cx, then_expr.span, &mut app);
+ if contains_expr.negated {
+ format!("{map_str}.entry({key_str}).or_insert_with(|| {block_str});")
+ } else {
+ // TODO: suggest using `if let Some(v) = map.get_mut(k) { .. }` here.
+ // This would need to be a different lint.
+ return;
+ }
+ }
+ };
+
+ span_lint_and_sugg(
+ cx,
+ MAP_ENTRY,
+ expr.span,
+ &format!("usage of `contains_key` followed by `insert` on a `{}`", map_ty.name()),
+ "try this",
+ sugg,
+ app,
+ );
+ }
+}
+
+#[derive(Clone, Copy)]
+enum MapType {
+ Hash,
+ BTree,
+}
+impl MapType {
+ fn name(self) -> &'static str {
+ match self {
+ Self::Hash => "HashMap",
+ Self::BTree => "BTreeMap",
+ }
+ }
+ fn entry_path(self) -> &'static str {
+ match self {
+ Self::Hash => "std::collections::hash_map::Entry",
+ Self::BTree => "std::collections::btree_map::Entry",
+ }
+ }
+}
+
+struct ContainsExpr<'tcx> {
+ negated: bool,
+ map: &'tcx Expr<'tcx>,
+ key: &'tcx Expr<'tcx>,
+ call_ctxt: SyntaxContext,
+}
+fn try_parse_contains<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Option<(MapType, ContainsExpr<'tcx>)> {
+ let mut negated = false;
+ let expr = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::Unary(UnOp::Not, e) => {
+ negated = !negated;
+ Some(e)
+ },
+ _ => None,
+ });
+ match expr.kind {
+ ExprKind::MethodCall(
+ _,
+ map,
+ [
+ Expr {
+ kind: ExprKind::AddrOf(_, _, key),
+ span: key_span,
+ ..
+ },
+ ],
+ _,
+ ) if key_span.ctxt() == expr.span.ctxt() => {
+ let id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
+ let expr = ContainsExpr {
+ negated,
+ map,
+ key,
+ call_ctxt: expr.span.ctxt(),
+ };
+ if match_def_path(cx, id, &paths::BTREEMAP_CONTAINS_KEY) {
+ Some((MapType::BTree, expr))
+ } else if match_def_path(cx, id, &paths::HASHMAP_CONTAINS_KEY) {
+ Some((MapType::Hash, expr))
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+struct InsertExpr<'tcx> {
+ map: &'tcx Expr<'tcx>,
+ key: &'tcx Expr<'tcx>,
+ value: &'tcx Expr<'tcx>,
+}
+fn try_parse_insert<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<InsertExpr<'tcx>> {
+ if let ExprKind::MethodCall(_, map, [key, value], _) = expr.kind {
+ let id = cx.typeck_results().type_dependent_def_id(expr.hir_id)?;
+ if match_def_path(cx, id, &paths::BTREEMAP_INSERT) || match_def_path(cx, id, &paths::HASHMAP_INSERT) {
+ Some(InsertExpr { map, key, value })
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+}
+
+/// An edit that will need to be made to move the expression to use the entry api
+#[derive(Clone, Copy)]
+enum Edit<'tcx> {
+ /// A semicolon that needs to be removed. Used to create a closure for `insert_with`.
+ RemoveSemi(Span),
+ /// An insertion into the map.
+ Insertion(Insertion<'tcx>),
+}
+impl<'tcx> Edit<'tcx> {
+ fn as_insertion(self) -> Option<Insertion<'tcx>> {
+ if let Self::Insertion(i) = self { Some(i) } else { None }
+ }
+}
+#[derive(Clone, Copy)]
+struct Insertion<'tcx> {
+ call: &'tcx Expr<'tcx>,
+ value: &'tcx Expr<'tcx>,
+}
+
+/// This visitor needs to do a multiple things:
+/// * Find all usages of the map. An insertion can only be made before any other usages of the map.
+/// * Determine if there's an insertion using the same key. There's no need for the entry api
+/// otherwise.
+/// * Determine if the final statement executed is an insertion. This is needed to use
+/// `or_insert_with`.
+/// * Determine if there's any sub-expression that can't be placed in a closure.
+/// * Determine if there's only a single insert statement. `or_insert` can be used in this case.
+#[expect(clippy::struct_excessive_bools)]
+struct InsertSearcher<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ /// The map expression used in the contains call.
+ map: &'tcx Expr<'tcx>,
+ /// The key expression used in the contains call.
+ key: &'tcx Expr<'tcx>,
+ /// The context of the top level block. All insert calls must be in the same context.
+ ctxt: SyntaxContext,
+ /// Whether this expression can be safely moved into a closure.
+ allow_insert_closure: bool,
+ /// Whether this expression can use the entry api.
+ can_use_entry: bool,
+ /// Whether this expression is the final expression in this code path. This may be a statement.
+ in_tail_pos: bool,
+ // Is this expression a single insert. A slightly better suggestion can be made in this case.
+ is_single_insert: bool,
+ /// If the visitor has seen the map being used.
+ is_map_used: bool,
+ /// The locations where changes need to be made for the suggestion.
+ edits: Vec<Edit<'tcx>>,
+ /// A stack of loops the visitor is currently in.
+ loops: Vec<HirId>,
+ /// Local variables created in the expression. These don't need to be captured.
+ locals: HirIdSet,
+}
+impl<'tcx> InsertSearcher<'_, 'tcx> {
+ /// Visit the expression as a branch in control flow. Multiple insert calls can be used, but
+ /// only if they are on separate code paths. This will return whether the map was used in the
+ /// given expression.
+ fn visit_cond_arm(&mut self, e: &'tcx Expr<'_>) -> bool {
+ let is_map_used = self.is_map_used;
+ let in_tail_pos = self.in_tail_pos;
+ self.visit_expr(e);
+ let res = self.is_map_used;
+ self.is_map_used = is_map_used;
+ self.in_tail_pos = in_tail_pos;
+ res
+ }
+
+ /// Visits an expression which is not itself in a tail position, but other sibling expressions
+ /// may be. e.g. if conditions
+ fn visit_non_tail_expr(&mut self, e: &'tcx Expr<'_>) {
+ let in_tail_pos = self.in_tail_pos;
+ self.in_tail_pos = false;
+ self.visit_expr(e);
+ self.in_tail_pos = in_tail_pos;
+ }
+}
+impl<'tcx> Visitor<'tcx> for InsertSearcher<'_, 'tcx> {
+ fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
+ match stmt.kind {
+ StmtKind::Semi(e) => {
+ self.visit_expr(e);
+
+ if self.in_tail_pos && self.allow_insert_closure {
+ // The spans are used to slice the top level expression into multiple parts. This requires that
+ // they all come from the same part of the source code.
+ if stmt.span.ctxt() == self.ctxt && e.span.ctxt() == self.ctxt {
+ self.edits
+ .push(Edit::RemoveSemi(stmt.span.trim_start(e.span).unwrap_or(DUMMY_SP)));
+ } else {
+ self.allow_insert_closure = false;
+ }
+ }
+ },
+ StmtKind::Expr(e) => self.visit_expr(e),
+ StmtKind::Local(l) => {
+ self.visit_pat(l.pat);
+ if let Some(e) = l.init {
+ self.allow_insert_closure &= !self.in_tail_pos;
+ self.in_tail_pos = false;
+ self.is_single_insert = false;
+ self.visit_expr(e);
+ }
+ },
+ StmtKind::Item(_) => {
+ self.allow_insert_closure &= !self.in_tail_pos;
+ self.is_single_insert = false;
+ },
+ }
+ }
+
+ fn visit_block(&mut self, block: &'tcx Block<'_>) {
+ // If the block is in a tail position, then the last expression (possibly a statement) is in the
+ // tail position. The rest, however, are not.
+ match (block.stmts, block.expr) {
+ ([], None) => {
+ self.allow_insert_closure &= !self.in_tail_pos;
+ },
+ ([], Some(expr)) => self.visit_expr(expr),
+ (stmts, Some(expr)) => {
+ let in_tail_pos = self.in_tail_pos;
+ self.in_tail_pos = false;
+ for stmt in stmts {
+ self.visit_stmt(stmt);
+ }
+ self.in_tail_pos = in_tail_pos;
+ self.visit_expr(expr);
+ },
+ ([stmts @ .., stmt], None) => {
+ let in_tail_pos = self.in_tail_pos;
+ self.in_tail_pos = false;
+ for stmt in stmts {
+ self.visit_stmt(stmt);
+ }
+ self.in_tail_pos = in_tail_pos;
+ self.visit_stmt(stmt);
+ },
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if !self.can_use_entry {
+ return;
+ }
+
+ match try_parse_insert(self.cx, expr) {
+ Some(insert_expr) if SpanlessEq::new(self.cx).eq_expr(self.map, insert_expr.map) => {
+ // Multiple inserts, inserts with a different key, and inserts from a macro can't use the entry api.
+ if self.is_map_used
+ || !SpanlessEq::new(self.cx).eq_expr(self.key, insert_expr.key)
+ || expr.span.ctxt() != self.ctxt
+ {
+ self.can_use_entry = false;
+ return;
+ }
+
+ self.edits.push(Edit::Insertion(Insertion {
+ call: expr,
+ value: insert_expr.value,
+ }));
+ self.is_map_used = true;
+ self.allow_insert_closure &= self.in_tail_pos;
+
+ // The value doesn't affect whether there is only a single insert expression.
+ let is_single_insert = self.is_single_insert;
+ self.visit_non_tail_expr(insert_expr.value);
+ self.is_single_insert = is_single_insert;
+ },
+ _ if SpanlessEq::new(self.cx).eq_expr(self.map, expr) => {
+ self.is_map_used = true;
+ },
+ _ => match expr.kind {
+ ExprKind::If(cond_expr, then_expr, Some(else_expr)) => {
+ self.is_single_insert = false;
+ self.visit_non_tail_expr(cond_expr);
+ // Each branch may contain it's own insert expression.
+ let mut is_map_used = self.visit_cond_arm(then_expr);
+ is_map_used |= self.visit_cond_arm(else_expr);
+ self.is_map_used = is_map_used;
+ },
+ ExprKind::Match(scrutinee_expr, arms, _) => {
+ self.is_single_insert = false;
+ self.visit_non_tail_expr(scrutinee_expr);
+ // Each branch may contain it's own insert expression.
+ let mut is_map_used = self.is_map_used;
+ for arm in arms {
+ self.visit_pat(arm.pat);
+ if let Some(Guard::If(guard) | Guard::IfLet(&Let { init: guard, .. })) = arm.guard {
+ self.visit_non_tail_expr(guard);
+ }
+ is_map_used |= self.visit_cond_arm(arm.body);
+ }
+ self.is_map_used = is_map_used;
+ },
+ ExprKind::Loop(block, ..) => {
+ self.loops.push(expr.hir_id);
+ self.is_single_insert = false;
+ self.allow_insert_closure &= !self.in_tail_pos;
+ // Don't allow insertions inside of a loop.
+ let edit_len = self.edits.len();
+ self.visit_block(block);
+ if self.edits.len() != edit_len {
+ self.can_use_entry = false;
+ }
+ self.loops.pop();
+ },
+ ExprKind::Block(block, _) => self.visit_block(block),
+ ExprKind::InlineAsm(_) => {
+ self.can_use_entry = false;
+ },
+ _ => {
+ self.allow_insert_closure &= !self.in_tail_pos;
+ self.allow_insert_closure &=
+ can_move_expr_to_closure_no_visit(self.cx, expr, &self.loops, &self.locals);
+ // Sub expressions are no longer in the tail position.
+ self.is_single_insert = false;
+ self.in_tail_pos = false;
+ walk_expr(self, expr);
+ },
+ },
+ }
+ }
+
+ fn visit_pat(&mut self, p: &'tcx Pat<'tcx>) {
+ p.each_binding_or_first(&mut |_, id, _, _| {
+ self.locals.insert(id);
+ });
+ }
+}
+
+struct InsertSearchResults<'tcx> {
+ edits: Vec<Edit<'tcx>>,
+ allow_insert_closure: bool,
+ is_single_insert: bool,
+}
+impl<'tcx> InsertSearchResults<'tcx> {
+ fn as_single_insertion(&self) -> Option<Insertion<'tcx>> {
+ self.is_single_insert.then(|| self.edits[0].as_insertion().unwrap())
+ }
+
+ fn snippet(
+ &self,
+ cx: &LateContext<'_>,
+ mut span: Span,
+ app: &mut Applicability,
+ write_wrapped: impl Fn(&mut String, Insertion<'_>, SyntaxContext, &mut Applicability),
+ ) -> String {
+ let ctxt = span.ctxt();
+ let mut res = String::new();
+ for insertion in self.edits.iter().filter_map(|e| e.as_insertion()) {
+ res.push_str(&snippet_with_applicability(
+ cx,
+ span.until(insertion.call.span),
+ "..",
+ app,
+ ));
+ if is_expr_used_or_unified(cx.tcx, insertion.call) {
+ write_wrapped(&mut res, insertion, ctxt, app);
+ } else {
+ let _ = write!(
+ res,
+ "e.insert({})",
+ snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0
+ );
+ }
+ span = span.trim_start(insertion.call.span).unwrap_or(DUMMY_SP);
+ }
+ res.push_str(&snippet_with_applicability(cx, span, "..", app));
+ res
+ }
+
+ fn snippet_occupied(&self, cx: &LateContext<'_>, span: Span, app: &mut Applicability) -> (String, &'static str) {
+ (
+ self.snippet(cx, span, app, |res, insertion, ctxt, app| {
+ // Insertion into a map would return `Some(&mut value)`, but the entry returns `&mut value`
+ let _ = write!(
+ res,
+ "Some(e.insert({}))",
+ snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0
+ );
+ }),
+ "Occupied(mut e)",
+ )
+ }
+
+ fn snippet_vacant(&self, cx: &LateContext<'_>, span: Span, app: &mut Applicability) -> (String, &'static str) {
+ (
+ self.snippet(cx, span, app, |res, insertion, ctxt, app| {
+ // Insertion into a map would return `None`, but the entry returns a mutable reference.
+ let _ = if is_expr_final_block_expr(cx.tcx, insertion.call) {
+ write!(
+ res,
+ "e.insert({});\n{}None",
+ snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0,
+ snippet_indent(cx, insertion.call.span).as_deref().unwrap_or(""),
+ )
+ } else {
+ write!(
+ res,
+ "{{ e.insert({}); None }}",
+ snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0,
+ )
+ };
+ }),
+ "Vacant(e)",
+ )
+ }
+
+ fn snippet_closure(&self, cx: &LateContext<'_>, mut span: Span, app: &mut Applicability) -> String {
+ let ctxt = span.ctxt();
+ let mut res = String::new();
+ for edit in &self.edits {
+ match *edit {
+ Edit::Insertion(insertion) => {
+ // Cut out the value from `map.insert(key, value)`
+ res.push_str(&snippet_with_applicability(
+ cx,
+ span.until(insertion.call.span),
+ "..",
+ app,
+ ));
+ res.push_str(&snippet_with_context(cx, insertion.value.span, ctxt, "..", app).0);
+ span = span.trim_start(insertion.call.span).unwrap_or(DUMMY_SP);
+ },
+ Edit::RemoveSemi(semi_span) => {
+ // Cut out the semicolon. This allows the value to be returned from the closure.
+ res.push_str(&snippet_with_applicability(cx, span.until(semi_span), "..", app));
+ span = span.trim_start(semi_span).unwrap_or(DUMMY_SP);
+ },
+ }
+ }
+ res.push_str(&snippet_with_applicability(cx, span, "..", app));
+ res
+ }
+}
+
+fn find_insert_calls<'tcx>(
+ cx: &LateContext<'tcx>,
+ contains_expr: &ContainsExpr<'tcx>,
+ expr: &'tcx Expr<'_>,
+) -> Option<InsertSearchResults<'tcx>> {
+ let mut s = InsertSearcher {
+ cx,
+ map: contains_expr.map,
+ key: contains_expr.key,
+ ctxt: expr.span.ctxt(),
+ edits: Vec::new(),
+ is_map_used: false,
+ allow_insert_closure: true,
+ can_use_entry: true,
+ in_tail_pos: true,
+ is_single_insert: true,
+ loops: Vec::new(),
+ locals: HirIdSet::default(),
+ };
+ s.visit_expr(expr);
+ let allow_insert_closure = s.allow_insert_closure;
+ let is_single_insert = s.is_single_insert;
+ let edits = s.edits;
+ s.can_use_entry.then_some(InsertSearchResults {
+ edits,
+ allow_insert_closure,
+ is_single_insert,
+ })
+}
--- /dev/null
- let substs = match closure_ty.kind() {
- ty::Closure(_, substs) => substs,
- _ => return false,
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::higher::VecArgs;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use clippy_utils::usage::local_used_after_expr;
+use clippy_utils::{higher, is_adjusted, path_to_local, path_to_local_id};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Closure, Expr, ExprKind, Param, PatKind, Unsafety};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
+use rustc_middle::ty::binding::BindingMode;
+use rustc_middle::ty::{self, Ty, TypeVisitable};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for closures which just call another function where
+ /// the function can be called directly. `unsafe` functions or calls where types
+ /// get adjusted are ignored.
+ ///
+ /// ### Why is this bad?
+ /// Needlessly creating a closure adds code for no benefit
+ /// and gives the optimizer more work.
+ ///
+ /// ### Known problems
+ /// If creating the closure inside the closure has a side-
+ /// effect then moving the closure creation out will change when that side-
+ /// effect runs.
+ /// See [#1439](https://github.com/rust-lang/rust-clippy/issues/1439) for more details.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// xs.map(|x| foo(x))
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// // where `foo(_)` is a plain function that takes the exact argument type of `x`.
+ /// xs.map(foo)
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub REDUNDANT_CLOSURE,
+ style,
+ "redundant closures, i.e., `|a| foo(a)` (which can be written as just `foo`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for closures which only invoke a method on the closure
+ /// argument and can be replaced by referencing the method directly.
+ ///
+ /// ### Why is this bad?
+ /// It's unnecessary to create the closure.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// Some('a').map(|s| s.to_uppercase());
+ /// ```
+ /// may be rewritten as
+ /// ```rust,ignore
+ /// Some('a').map(char::to_uppercase);
+ /// ```
+ #[clippy::version = "1.35.0"]
+ pub REDUNDANT_CLOSURE_FOR_METHOD_CALLS,
+ pedantic,
+ "redundant closures for method calls"
+}
+
+declare_lint_pass!(EtaReduction => [REDUNDANT_CLOSURE, REDUNDANT_CLOSURE_FOR_METHOD_CALLS]);
+
+impl<'tcx> LateLintPass<'tcx> for EtaReduction {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+ let body = match expr.kind {
+ ExprKind::Closure(&Closure { body, .. }) => cx.tcx.hir().body(body),
+ _ => return,
+ };
+ if body.value.span.from_expansion() {
+ if body.params.is_empty() {
+ if let Some(VecArgs::Vec(&[])) = higher::VecArgs::hir(cx, body.value) {
+ // replace `|| vec![]` with `Vec::new`
+ span_lint_and_sugg(
+ cx,
+ REDUNDANT_CLOSURE,
+ expr.span,
+ "redundant closure",
+ "replace the closure with `Vec::new`",
+ "std::vec::Vec::new".into(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ // skip `foo(|| macro!())`
+ return;
+ }
+
+ let closure_ty = cx.typeck_results().expr_ty(expr);
+
+ if_chain!(
+ if !is_adjusted(cx, body.value);
+ if let ExprKind::Call(callee, args) = body.value.kind;
+ if let ExprKind::Path(_) = callee.kind;
+ if check_inputs(cx, body.params, None, args);
+ let callee_ty = cx.typeck_results().expr_ty_adjusted(callee);
+ let call_ty = cx.typeck_results().type_dependent_def_id(body.value.hir_id)
+ .map_or(callee_ty, |id| cx.tcx.type_of(id));
+ if check_sig(cx, closure_ty, call_ty);
+ let substs = cx.typeck_results().node_substs(callee.hir_id);
+ // This fixes some false positives that I don't entirely understand
+ if substs.is_empty() || !cx.typeck_results().expr_ty(expr).has_late_bound_regions();
+ // A type param function ref like `T::f` is not 'static, however
+ // it is if cast like `T::f as fn()`. This seems like a rustc bug.
+ if !substs.types().any(|t| matches!(t.kind(), ty::Param(_)));
+ let callee_ty_unadjusted = cx.typeck_results().expr_ty(callee).peel_refs();
+ if !is_type_diagnostic_item(cx, callee_ty_unadjusted, sym::Arc);
+ if !is_type_diagnostic_item(cx, callee_ty_unadjusted, sym::Rc);
+ then {
+ span_lint_and_then(cx, REDUNDANT_CLOSURE, expr.span, "redundant closure", |diag| {
+ if let Some(mut snippet) = snippet_opt(cx, callee.span) {
+ if let Some(fn_mut_id) = cx.tcx.lang_items().fn_mut_trait()
+ && implements_trait(cx, callee_ty.peel_refs(), fn_mut_id, &[])
+ && path_to_local(callee).map_or(false, |l| local_used_after_expr(cx, l, expr))
+ {
+ // Mutable closure is used after current expr; we cannot consume it.
+ snippet = format!("&mut {snippet}");
+ }
+ diag.span_suggestion(
+ expr.span,
+ "replace the closure with the function itself",
+ snippet,
+ Applicability::MachineApplicable,
+ );
+ }
+ });
+ }
+ );
+
+ if_chain!(
+ if !is_adjusted(cx, body.value);
+ if let ExprKind::MethodCall(path, receiver, args, _) = body.value.kind;
+ if check_inputs(cx, body.params, Some(receiver), args);
+ let method_def_id = cx.typeck_results().type_dependent_def_id(body.value.hir_id).unwrap();
+ let substs = cx.typeck_results().node_substs(body.value.hir_id);
+ let call_ty = cx.tcx.bound_type_of(method_def_id).subst(cx.tcx, substs);
+ if check_sig(cx, closure_ty, call_ty);
+ then {
+ span_lint_and_then(cx, REDUNDANT_CLOSURE_FOR_METHOD_CALLS, expr.span, "redundant closure", |diag| {
+ let name = get_ufcs_type_name(cx, method_def_id);
+ diag.span_suggestion(
+ expr.span,
+ "replace the closure with the method itself",
+ format!("{name}::{}", path.ident.name),
+ Applicability::MachineApplicable,
+ );
+ })
+ }
+ );
+ }
+}
+
+fn check_inputs(
+ cx: &LateContext<'_>,
+ params: &[Param<'_>],
+ receiver: Option<&Expr<'_>>,
+ call_args: &[Expr<'_>],
+) -> bool {
+ if receiver.map_or(params.len() != call_args.len(), |_| params.len() != call_args.len() + 1) {
+ return false;
+ }
+ let binding_modes = cx.typeck_results().pat_binding_modes();
+ let check_inputs = |param: &Param<'_>, arg| {
+ match param.pat.kind {
+ PatKind::Binding(_, id, ..) if path_to_local_id(arg, id) => {},
+ _ => return false,
+ }
+ // checks that parameters are not bound as `ref` or `ref mut`
+ if let Some(BindingMode::BindByReference(_)) = binding_modes.get(param.pat.hir_id) {
+ return false;
+ }
+
+ match *cx.typeck_results().expr_adjustments(arg) {
+ [] => true,
+ [
+ Adjustment {
+ kind: Adjust::Deref(None),
+ ..
+ },
+ Adjustment {
+ kind: Adjust::Borrow(AutoBorrow::Ref(_, mu2)),
+ ..
+ },
+ ] => {
+ // re-borrow with the same mutability is allowed
+ let ty = cx.typeck_results().expr_ty(arg);
+ matches!(*ty.kind(), ty::Ref(.., mu1) if mu1 == mu2.into())
+ },
+ _ => false,
+ }
+ };
+ std::iter::zip(params, receiver.into_iter().chain(call_args.iter())).all(|(param, arg)| check_inputs(param, arg))
+}
+
+fn check_sig<'tcx>(cx: &LateContext<'tcx>, closure_ty: Ty<'tcx>, call_ty: Ty<'tcx>) -> bool {
+ let call_sig = call_ty.fn_sig(cx.tcx);
+ if call_sig.unsafety() == Unsafety::Unsafe {
+ return false;
+ }
+ if !closure_ty.has_late_bound_regions() {
+ return true;
+ }
++ let ty::Closure(_, substs) = closure_ty.kind() else {
++ return false;
+ };
+ let closure_sig = cx.tcx.signature_unclosure(substs.as_closure().sig(), Unsafety::Normal);
+ cx.tcx.erase_late_bound_regions(closure_sig) == cx.tcx.erase_late_bound_regions(call_sig)
+}
+
+fn get_ufcs_type_name(cx: &LateContext<'_>, method_def_id: DefId) -> String {
+ let assoc_item = cx.tcx.associated_item(method_def_id);
+ let def_id = assoc_item.container_id(cx.tcx);
+ match assoc_item.container {
+ ty::TraitContainer => cx.tcx.def_path_str(def_id),
+ ty::ImplContainer => {
+ let ty = cx.tcx.type_of(def_id);
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.def_path_str(adt.did()),
+ _ => ty.to_string(),
+ }
+ },
+ }
+}
--- /dev/null
- use clippy_utils::macros::{is_format_macro, FormatArgsExpn, FormatParam, FormatParamUsage};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::macros::FormatParamKind::{Implicit, Named, Numbered, Starred};
- use clippy_utils::ty::implements_trait;
++use clippy_utils::macros::{
++ is_format_macro, is_panic, root_macro_call, Count, FormatArg, FormatArgsExpn, FormatParam, FormatParamUsage,
++};
+use clippy_utils::source::snippet_opt;
- pedantic,
++use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use clippy_utils::{is_diag_trait_item, meets_msrv, msrvs};
+use if_chain::if_chain;
+use itertools::Itertools;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, HirId, QPath};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::ty::adjustment::{Adjust, Adjustment};
+use rustc_middle::ty::Ty;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::def_id::DefId;
++use rustc_span::edition::Edition::Edition2021;
+use rustc_span::{sym, ExpnData, ExpnKind, Span, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects `format!` within the arguments of another macro that does
+ /// formatting such as `format!` itself, `write!` or `println!`. Suggests
+ /// inlining the `format!` call.
+ ///
+ /// ### Why is this bad?
+ /// The recommended code is both shorter and avoids a temporary allocation.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::panic::Location;
+ /// println!("error: {}", format!("something failed at {}", Location::caller()));
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::panic::Location;
+ /// println!("error: something failed at {}", Location::caller());
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub FORMAT_IN_FORMAT_ARGS,
+ perf,
+ "`format!` used in a macro that does formatting"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for [`ToString::to_string`](https://doc.rust-lang.org/std/string/trait.ToString.html#tymethod.to_string)
+ /// applied to a type that implements [`Display`](https://doc.rust-lang.org/std/fmt/trait.Display.html)
+ /// in a macro that does formatting.
+ ///
+ /// ### Why is this bad?
+ /// Since the type implements `Display`, the use of `to_string` is
+ /// unnecessary.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::panic::Location;
+ /// println!("error: something failed at {}", Location::caller().to_string());
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::panic::Location;
+ /// println!("error: something failed at {}", Location::caller());
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub TO_STRING_IN_FORMAT_ARGS,
+ perf,
+ "`to_string` applied to a type that implements `Display` in format args"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detect when a variable is not inlined in a format string,
+ /// and suggests to inline it.
+ ///
+ /// ### Why is this bad?
+ /// Non-inlined code is slightly more difficult to read and understand,
+ /// as it requires arguments to be matched against the format string.
+ /// The inlined syntax, where allowed, is simpler.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let var = 42;
+ /// # let width = 1;
+ /// # let prec = 2;
+ /// format!("{}", var);
+ /// format!("{v:?}", v = var);
+ /// format!("{0} {0}", var);
+ /// format!("{0:1$}", var, width);
+ /// format!("{:.*}", prec, var);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let var = 42;
+ /// # let width = 1;
+ /// # let prec = 2;
+ /// format!("{var}");
+ /// format!("{var:?}");
+ /// format!("{var} {var}");
+ /// format!("{var:width$}");
+ /// format!("{var:.prec$}");
+ /// ```
+ ///
+ /// ### Known Problems
+ ///
+ /// There may be a false positive if the format string is expanded from certain proc macros:
+ ///
+ /// ```ignore
+ /// println!(indoc!("{}"), var);
+ /// ```
+ ///
+ /// If a format string contains a numbered argument that cannot be inlined
+ /// nothing will be suggested, e.g. `println!("{0}={1}", var, 1+2)`.
+ #[clippy::version = "1.65.0"]
+ pub UNINLINED_FORMAT_ARGS,
- impl_lint_pass!(FormatArgs => [FORMAT_IN_FORMAT_ARGS, UNINLINED_FORMAT_ARGS, TO_STRING_IN_FORMAT_ARGS]);
++ style,
+ "using non-inlined variables in `format!` calls"
+}
+
- if_chain! {
- if let Some(format_args) = FormatArgsExpn::parse(cx, expr);
- let expr_expn_data = expr.span.ctxt().outer_expn_data();
- let outermost_expn_data = outermost_expn_data(expr_expn_data);
- if let Some(macro_def_id) = outermost_expn_data.macro_def_id;
- if is_format_macro(cx, macro_def_id);
- if let ExpnKind::Macro(_, name) = outermost_expn_data.kind;
- then {
- for arg in &format_args.args {
- if !arg.format.is_default() {
- continue;
- }
- if is_aliased(&format_args, arg.param.value.hir_id) {
- continue;
- }
- check_format_in_format_args(cx, outermost_expn_data.call_site, name, arg.param.value);
- check_to_string_in_format_args(cx, name, arg.param.value);
++declare_clippy_lint! {
++ /// ### What it does
++ /// Detects [formatting parameters] that have no effect on the output of
++ /// `format!()`, `println!()` or similar macros.
++ ///
++ /// ### Why is this bad?
++ /// Shorter format specifiers are easier to read, it may also indicate that
++ /// an expected formatting operation such as adding padding isn't happening.
++ ///
++ /// ### Example
++ /// ```rust
++ /// println!("{:.}", 1.0);
++ ///
++ /// println!("not padded: {:5}", format_args!("..."));
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// println!("{}", 1.0);
++ ///
++ /// println!("not padded: {}", format_args!("..."));
++ /// // OR
++ /// println!("padded: {:5}", format!("..."));
++ /// ```
++ ///
++ /// [formatting parameters]: https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters
++ #[clippy::version = "1.66.0"]
++ pub UNUSED_FORMAT_SPECS,
++ complexity,
++ "use of a format specifier that has no effect"
++}
++
++impl_lint_pass!(FormatArgs => [
++ FORMAT_IN_FORMAT_ARGS,
++ TO_STRING_IN_FORMAT_ARGS,
++ UNINLINED_FORMAT_ARGS,
++ UNUSED_FORMAT_SPECS,
++]);
+
+pub struct FormatArgs {
+ msrv: Option<RustcVersion>,
+}
+
+impl FormatArgs {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for FormatArgs {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
- if meets_msrv(self.msrv, msrvs::FORMAT_ARGS_CAPTURE) {
- check_uninlined_args(cx, &format_args, outermost_expn_data.call_site);
++ if let Some(format_args) = FormatArgsExpn::parse(cx, expr)
++ && let expr_expn_data = expr.span.ctxt().outer_expn_data()
++ && let outermost_expn_data = outermost_expn_data(expr_expn_data)
++ && let Some(macro_def_id) = outermost_expn_data.macro_def_id
++ && is_format_macro(cx, macro_def_id)
++ && let ExpnKind::Macro(_, name) = outermost_expn_data.kind
++ {
++ for arg in &format_args.args {
++ check_unused_format_specifier(cx, arg);
++ if !arg.format.is_default() {
++ continue;
+ }
- fn check_uninlined_args(cx: &LateContext<'_>, args: &FormatArgsExpn<'_>, call_site: Span) {
++ if is_aliased(&format_args, arg.param.value.hir_id) {
++ continue;
+ }
++ check_format_in_format_args(cx, outermost_expn_data.call_site, name, arg.param.value);
++ check_to_string_in_format_args(cx, name, arg.param.value);
++ }
++ if meets_msrv(self.msrv, msrvs::FORMAT_ARGS_CAPTURE) {
++ check_uninlined_args(cx, &format_args, outermost_expn_data.call_site, macro_def_id);
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
- if let ExprKind::MethodCall(_, receiver, [], _) = value.kind;
++fn check_unused_format_specifier(cx: &LateContext<'_>, arg: &FormatArg<'_>) {
++ let param_ty = cx.typeck_results().expr_ty(arg.param.value).peel_refs();
++
++ if let Count::Implied(Some(mut span)) = arg.format.precision
++ && !span.is_empty()
++ {
++ span_lint_and_then(
++ cx,
++ UNUSED_FORMAT_SPECS,
++ span,
++ "empty precision specifier has no effect",
++ |diag| {
++ if param_ty.is_floating_point() {
++ diag.note("a precision specifier is not required to format floats");
++ }
++
++ if arg.format.is_default() {
++ // If there's no other specifiers remove the `:` too
++ span = arg.format_span();
++ }
++
++ diag.span_suggestion_verbose(span, "remove the `.`", "", Applicability::MachineApplicable);
++ },
++ );
++ }
++
++ if is_type_diagnostic_item(cx, param_ty, sym::Arguments) && !arg.format.is_default_for_trait() {
++ span_lint_and_then(
++ cx,
++ UNUSED_FORMAT_SPECS,
++ arg.span,
++ "format specifiers have no effect on `format_args!()`",
++ |diag| {
++ let mut suggest_format = |spec, span| {
++ let message = format!("for the {spec} to apply consider using `format!()`");
++
++ if let Some(mac_call) = root_macro_call(arg.param.value.span)
++ && cx.tcx.is_diagnostic_item(sym::format_args_macro, mac_call.def_id)
++ && arg.span.eq_ctxt(mac_call.span)
++ {
++ diag.span_suggestion(
++ cx.sess().source_map().span_until_char(mac_call.span, '!'),
++ message,
++ "format",
++ Applicability::MaybeIncorrect,
++ );
++ } else if let Some(span) = span {
++ diag.span_help(span, message);
++ }
++ };
++
++ if !arg.format.width.is_implied() {
++ suggest_format("width", arg.format.width.span());
++ }
++
++ if !arg.format.precision.is_implied() {
++ suggest_format("precision", arg.format.precision.span());
++ }
++
++ diag.span_suggestion_verbose(
++ arg.format_span(),
++ "if the current behavior is intentional, remove the format specifiers",
++ "",
++ Applicability::MaybeIncorrect,
++ );
++ },
++ );
++ }
++}
++
++fn check_uninlined_args(cx: &LateContext<'_>, args: &FormatArgsExpn<'_>, call_site: Span, def_id: DefId) {
+ if args.format_string.span.from_expansion() {
+ return;
+ }
++ if call_site.edition() < Edition2021 && is_panic(cx, def_id) {
++ // panic! before 2021 edition considers a single string argument as non-format
++ return;
++ }
+
+ let mut fixes = Vec::new();
+ // If any of the arguments are referenced by an index number,
+ // and that argument is not a simple variable and cannot be inlined,
+ // we cannot remove any other arguments in the format string,
+ // because the index numbers might be wrong after inlining.
+ // Example of an un-inlinable format: print!("{}{1}", foo, 2)
+ if !args.params().all(|p| check_one_arg(args, &p, &mut fixes)) || fixes.is_empty() {
+ return;
+ }
+
+ // Temporarily ignore multiline spans: https://github.com/rust-lang/rust/pull/102729#discussion_r988704308
+ if fixes.iter().any(|(span, _)| cx.sess().source_map().is_multiline(*span)) {
+ return;
+ }
+
+ span_lint_and_then(
+ cx,
+ UNINLINED_FORMAT_ARGS,
+ call_site,
+ "variables can be used directly in the `format!` string",
+ |diag| {
+ diag.multipart_suggestion("change this to", fixes, Applicability::MachineApplicable);
+ },
+ );
+}
+
+fn check_one_arg(args: &FormatArgsExpn<'_>, param: &FormatParam<'_>, fixes: &mut Vec<(Span, String)>) -> bool {
+ if matches!(param.kind, Implicit | Starred | Named(_) | Numbered)
+ && let ExprKind::Path(QPath::Resolved(None, path)) = param.value.kind
+ && let [segment] = path.segments
+ && let Some(arg_span) = args.value_with_prev_comma_span(param.value.hir_id)
+ {
+ let replacement = match param.usage {
+ FormatParamUsage::Argument => segment.ident.name.to_string(),
+ FormatParamUsage::Width => format!("{}$", segment.ident.name),
+ FormatParamUsage::Precision => format!(".{}$", segment.ident.name),
+ };
+ fixes.push((param.span, replacement));
+ fixes.push((arg_span, String::new()));
+ true // successful inlining, continue checking
+ } else {
+ // if we can't inline a numbered argument, we can't continue
+ param.kind != Numbered
+ }
+}
+
+fn outermost_expn_data(expn_data: ExpnData) -> ExpnData {
+ if expn_data.call_site.from_expansion() {
+ outermost_expn_data(expn_data.call_site.ctxt().outer_expn_data())
+ } else {
+ expn_data
+ }
+}
+
+fn check_format_in_format_args(
+ cx: &LateContext<'_>,
+ call_site: Span,
+ name: Symbol,
+ arg: &Expr<'_>,
+) {
+ let expn_data = arg.span.ctxt().outer_expn_data();
+ if expn_data.call_site.from_expansion() {
+ return;
+ }
+ let Some(mac_id) = expn_data.macro_def_id else { return };
+ if !cx.tcx.is_diagnostic_item(sym::format_macro, mac_id) {
+ return;
+ }
+ span_lint_and_then(
+ cx,
+ FORMAT_IN_FORMAT_ARGS,
+ call_site,
+ &format!("`format!` in `{name}!` args"),
+ |diag| {
+ diag.help(&format!(
+ "combine the `format!(..)` arguments with the outer `{name}!(..)` call"
+ ));
+ diag.help("or consider changing `format!` to `format_args!`");
+ },
+ );
+}
+
+fn check_to_string_in_format_args(cx: &LateContext<'_>, name: Symbol, value: &Expr<'_>) {
+ if_chain! {
+ if !value.span.from_expansion();
- value.span.with_lo(receiver.span.hi()),
++ if let ExprKind::MethodCall(_, receiver, [], to_string_span) = value.kind;
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(value.hir_id);
+ if is_diag_trait_item(cx, method_def_id, sym::ToString);
+ let receiver_ty = cx.typeck_results().expr_ty(receiver);
+ if let Some(display_trait_id) = cx.tcx.get_diagnostic_item(sym::Display);
+ let (n_needed_derefs, target) =
+ count_needed_derefs(receiver_ty, cx.typeck_results().expr_adjustments(receiver).iter());
+ if implements_trait(cx, target, display_trait_id, &[]);
+ if let Some(sized_trait_id) = cx.tcx.lang_items().sized_trait();
+ if let Some(receiver_snippet) = snippet_opt(cx, receiver.span);
+ then {
+ let needs_ref = !implements_trait(cx, receiver_ty, sized_trait_id, &[]);
+ if n_needed_derefs == 0 && !needs_ref {
+ span_lint_and_sugg(
+ cx,
+ TO_STRING_IN_FORMAT_ARGS,
++ to_string_span.with_lo(receiver.span.hi()),
+ &format!(
+ "`to_string` applied to a type that implements `Display` in `{name}!` args"
+ ),
+ "remove this",
+ String::new(),
+ Applicability::MachineApplicable,
+ );
+ } else {
+ span_lint_and_sugg(
+ cx,
+ TO_STRING_IN_FORMAT_ARGS,
+ value.span,
+ &format!(
+ "`to_string` applied to a type that implements `Display` in `{name}!` args"
+ ),
+ "use this",
+ format!(
+ "{}{:*>n_needed_derefs$}{receiver_snippet}",
+ if needs_ref { "&" } else { "" },
+ ""
+ ),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+/// Returns true if `hir_id` is referred to by multiple format params
+fn is_aliased(args: &FormatArgsExpn<'_>, hir_id: HirId) -> bool {
+ args.params().filter(|param| param.value.hir_id == hir_id).at_most_one().is_err()
+}
+
+fn count_needed_derefs<'tcx, I>(mut ty: Ty<'tcx>, mut iter: I) -> (usize, Ty<'tcx>)
+where
+ I: Iterator<Item = &'tcx Adjustment<'tcx>>,
+{
+ let mut n_total = 0;
+ let mut n_needed = 0;
+ loop {
+ if let Some(Adjustment { kind: Adjust::Deref(overloaded_deref), target }) = iter.next() {
+ n_total += 1;
+ if overloaded_deref.is_some() {
+ n_needed = n_total;
+ }
+ ty = *target;
+ } else {
+ return (n_needed, ty);
+ }
+ }
+}
--- /dev/null
- use clippy_utils::diagnostics::span_lint_and_help;
- use clippy_utils::{meets_msrv, msrvs};
- use if_chain::if_chain;
- use rustc_hir as hir;
++use clippy_utils::diagnostics::span_lint_and_then;
++use clippy_utils::macros::span_is_local;
++use clippy_utils::source::snippet_opt;
++use clippy_utils::{meets_msrv, msrvs, path_def_id};
++use rustc_errors::Applicability;
++use rustc_hir::intravisit::{walk_path, Visitor};
++use rustc_hir::{
++ GenericArg, GenericArgs, HirId, Impl, ImplItemKind, ImplItemRef, Item, ItemKind, PatKind, Path, PathSegment, Ty,
++ TyKind,
++};
+use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::hir::nested_filter::OnlyBodies;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
- use rustc_span::symbol::sym;
++use rustc_span::symbol::{kw, sym};
++use rustc_span::{Span, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Searches for implementations of the `Into<..>` trait and suggests to implement `From<..>` instead.
+ ///
+ /// ### Why is this bad?
+ /// According the std docs implementing `From<..>` is preferred since it gives you `Into<..>` for free where the reverse isn't true.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct StringWrapper(String);
+ ///
+ /// impl Into<StringWrapper> for String {
+ /// fn into(self) -> StringWrapper {
+ /// StringWrapper(self)
+ /// }
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct StringWrapper(String);
+ ///
+ /// impl From<String> for StringWrapper {
+ /// fn from(s: String) -> StringWrapper {
+ /// StringWrapper(s)
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub FROM_OVER_INTO,
+ style,
+ "Warns on implementations of `Into<..>` to use `From<..>`"
+}
+
+pub struct FromOverInto {
+ msrv: Option<RustcVersion>,
+}
+
+impl FromOverInto {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ FromOverInto { msrv }
+ }
+}
+
+impl_lint_pass!(FromOverInto => [FROM_OVER_INTO]);
+
+impl<'tcx> LateLintPass<'tcx> for FromOverInto {
- fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
- if !meets_msrv(self.msrv, msrvs::RE_REBALANCING_COHERENCE) {
++ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
++ if !meets_msrv(self.msrv, msrvs::RE_REBALANCING_COHERENCE) || !span_is_local(item.span) {
+ return;
+ }
+
- if_chain! {
- if let hir::ItemKind::Impl{ .. } = &item.kind;
- if let Some(impl_trait_ref) = cx.tcx.impl_trait_ref(item.def_id);
- if cx.tcx.is_diagnostic_item(sym::Into, impl_trait_ref.def_id);
-
- then {
- span_lint_and_help(
- cx,
- FROM_OVER_INTO,
- cx.tcx.sess.source_map().guess_head_span(item.span),
- "an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true",
- None,
- &format!("consider to implement `From<{}>` instead", impl_trait_ref.self_ty()),
- );
- }
++ if let ItemKind::Impl(Impl {
++ of_trait: Some(hir_trait_ref),
++ self_ty,
++ items: [impl_item_ref],
++ ..
++ }) = item.kind
++ && let Some(into_trait_seg) = hir_trait_ref.path.segments.last()
++ // `impl Into<target_ty> for self_ty`
++ && let Some(GenericArgs { args: [GenericArg::Type(target_ty)], .. }) = into_trait_seg.args
++ && let Some(middle_trait_ref) = cx.tcx.impl_trait_ref(item.def_id)
++ && cx.tcx.is_diagnostic_item(sym::Into, middle_trait_ref.def_id)
++ {
++ span_lint_and_then(
++ cx,
++ FROM_OVER_INTO,
++ cx.tcx.sess.source_map().guess_head_span(item.span),
++ "an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true",
++ |diag| {
++ // If the target type is likely foreign mention the orphan rules as it's a common source of confusion
++ if path_def_id(cx, target_ty.peel_refs()).map_or(true, |id| !id.is_local()) {
++ diag.help(
++ "`impl From<Local> for Foreign` is allowed by the orphan rules, for more information see\n\
++ https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence"
++ );
++ }
++
++ let message = format!("replace the `Into` implentation with `From<{}>`", middle_trait_ref.self_ty());
++ if let Some(suggestions) = convert_to_from(cx, into_trait_seg, target_ty, self_ty, impl_item_ref) {
++ diag.multipart_suggestion(message, suggestions, Applicability::MachineApplicable);
++ } else {
++ diag.help(message);
++ }
++ },
++ );
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
++
++/// Finds the occurences of `Self` and `self`
++struct SelfFinder<'a, 'tcx> {
++ cx: &'a LateContext<'tcx>,
++ /// Occurences of `Self`
++ upper: Vec<Span>,
++ /// Occurences of `self`
++ lower: Vec<Span>,
++ /// If any of the `self`/`Self` usages were from an expansion, or the body contained a binding
++ /// already named `val`
++ invalid: bool,
++}
++
++impl<'a, 'tcx> Visitor<'tcx> for SelfFinder<'a, 'tcx> {
++ type NestedFilter = OnlyBodies;
++
++ fn nested_visit_map(&mut self) -> Self::Map {
++ self.cx.tcx.hir()
++ }
++
++ fn visit_path(&mut self, path: &'tcx Path<'tcx>, _id: HirId) {
++ for segment in path.segments {
++ match segment.ident.name {
++ kw::SelfLower => self.lower.push(segment.ident.span),
++ kw::SelfUpper => self.upper.push(segment.ident.span),
++ _ => continue,
++ }
++ }
++
++ self.invalid |= path.span.from_expansion();
++ if !self.invalid {
++ walk_path(self, path);
++ }
++ }
++
++ fn visit_name(&mut self, name: Symbol) {
++ if name == sym::val {
++ self.invalid = true;
++ }
++ }
++}
++
++fn convert_to_from(
++ cx: &LateContext<'_>,
++ into_trait_seg: &PathSegment<'_>,
++ target_ty: &Ty<'_>,
++ self_ty: &Ty<'_>,
++ impl_item_ref: &ImplItemRef,
++) -> Option<Vec<(Span, String)>> {
++ let impl_item = cx.tcx.hir().impl_item(impl_item_ref.id);
++ let ImplItemKind::Fn(ref sig, body_id) = impl_item.kind else { return None };
++ let body = cx.tcx.hir().body(body_id);
++ let [input] = body.params else { return None };
++ let PatKind::Binding(.., self_ident, None) = input.pat.kind else { return None };
++
++ let from = snippet_opt(cx, self_ty.span)?;
++ let into = snippet_opt(cx, target_ty.span)?;
++
++ let mut suggestions = vec![
++ // impl Into<T> for U -> impl From<T> for U
++ // ~~~~ ~~~~
++ (into_trait_seg.ident.span, String::from("From")),
++ // impl Into<T> for U -> impl Into<U> for U
++ // ~ ~
++ (target_ty.span, from.clone()),
++ // impl Into<T> for U -> impl Into<T> for T
++ // ~ ~
++ (self_ty.span, into),
++ // fn into(self) -> T -> fn from(self) -> T
++ // ~~~~ ~~~~
++ (impl_item.ident.span, String::from("from")),
++ // fn into([mut] self) -> T -> fn into([mut] v: T) -> T
++ // ~~~~ ~~~~
++ (self_ident.span, format!("val: {from}")),
++ // fn into(self) -> T -> fn into(self) -> Self
++ // ~ ~~~~
++ (sig.decl.output.span(), String::from("Self")),
++ ];
++
++ let mut finder = SelfFinder {
++ cx,
++ upper: Vec::new(),
++ lower: Vec::new(),
++ invalid: false,
++ };
++ finder.visit_expr(body.value);
++
++ if finder.invalid {
++ return None;
++ }
++
++ // don't try to replace e.g. `Self::default()` with `&[T]::default()`
++ if !finder.upper.is_empty() && !matches!(self_ty.kind, TyKind::Path(_)) {
++ return None;
++ }
++
++ for span in finder.upper {
++ suggestions.push((span, from.clone()));
++ }
++ for span in finder.lower {
++ suggestions.push((span, String::from("val")));
++ }
++
++ Some(suggestions)
++}
--- /dev/null
- use rustc_span::{sym, Span};
+use rustc_ast::ast::Attribute;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::{DefIdSet, LocalDefId};
+use rustc_hir::{self as hir, def::Res, QPath};
+use rustc_lint::{LateContext, LintContext};
+use rustc_middle::{
+ lint::in_external_macro,
+ ty::{self, Ty},
+};
- use clippy_utils::{match_def_path, return_ty, trait_ref_of_method};
++use rustc_span::{sym, Span, Symbol};
+
+use clippy_utils::attrs::is_proc_macro;
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::is_must_use_ty;
+use clippy_utils::visitors::for_each_expr;
- static KNOWN_WRAPPER_TYS: &[&[&str]] = &[&["alloc", "rc", "Rc"], &["std", "sync", "Arc"]];
++use clippy_utils::{return_ty, trait_ref_of_method};
+
+use core::ops::ControlFlow;
+
+use super::{DOUBLE_MUST_USE, MUST_USE_CANDIDATE, MUST_USE_UNIT};
+
+pub(super) fn check_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let attr = cx.tcx.get_attr(item.def_id.to_def_id(), sym::must_use);
+ if let hir::ItemKind::Fn(ref sig, _generics, ref body_id) = item.kind {
+ let is_public = cx.access_levels.is_exported(item.def_id.def_id);
+ let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
+ if let Some(attr) = attr {
+ check_needless_must_use(cx, sig.decl, item.hir_id(), item.span, fn_header_span, attr);
+ } else if is_public && !is_proc_macro(cx.sess(), attrs) && !attrs.iter().any(|a| a.has_name(sym::no_mangle)) {
+ check_must_use_candidate(
+ cx,
+ sig.decl,
+ cx.tcx.hir().body(*body_id),
+ item.span,
+ item.def_id.def_id,
+ item.span.with_hi(sig.decl.output.span().hi()),
+ "this function could have a `#[must_use]` attribute",
+ );
+ }
+ }
+}
+
+pub(super) fn check_impl_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
+ if let hir::ImplItemKind::Fn(ref sig, ref body_id) = item.kind {
+ let is_public = cx.access_levels.is_exported(item.def_id.def_id);
+ let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let attr = cx.tcx.get_attr(item.def_id.to_def_id(), sym::must_use);
+ if let Some(attr) = attr {
+ check_needless_must_use(cx, sig.decl, item.hir_id(), item.span, fn_header_span, attr);
+ } else if is_public && !is_proc_macro(cx.sess(), attrs) && trait_ref_of_method(cx, item.def_id.def_id).is_none()
+ {
+ check_must_use_candidate(
+ cx,
+ sig.decl,
+ cx.tcx.hir().body(*body_id),
+ item.span,
+ item.def_id.def_id,
+ item.span.with_hi(sig.decl.output.span().hi()),
+ "this method could have a `#[must_use]` attribute",
+ );
+ }
+ }
+}
+
+pub(super) fn check_trait_item<'tcx>(cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
+ if let hir::TraitItemKind::Fn(ref sig, ref eid) = item.kind {
+ let is_public = cx.access_levels.is_exported(item.def_id.def_id);
+ let fn_header_span = item.span.with_hi(sig.decl.output.span().hi());
+
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let attr = cx.tcx.get_attr(item.def_id.to_def_id(), sym::must_use);
+ if let Some(attr) = attr {
+ check_needless_must_use(cx, sig.decl, item.hir_id(), item.span, fn_header_span, attr);
+ } else if let hir::TraitFn::Provided(eid) = *eid {
+ let body = cx.tcx.hir().body(eid);
+ if attr.is_none() && is_public && !is_proc_macro(cx.sess(), attrs) {
+ check_must_use_candidate(
+ cx,
+ sig.decl,
+ body,
+ item.span,
+ item.def_id.def_id,
+ item.span.with_hi(sig.decl.output.span().hi()),
+ "this method could have a `#[must_use]` attribute",
+ );
+ }
+ }
+ }
+}
+
+fn check_needless_must_use(
+ cx: &LateContext<'_>,
+ decl: &hir::FnDecl<'_>,
+ item_id: hir::HirId,
+ item_span: Span,
+ fn_header_span: Span,
+ attr: &Attribute,
+) {
+ if in_external_macro(cx.sess(), item_span) {
+ return;
+ }
+ if returns_unit(decl) {
+ span_lint_and_then(
+ cx,
+ MUST_USE_UNIT,
+ fn_header_span,
+ "this unit-returning function has a `#[must_use]` attribute",
+ |diag| {
+ diag.span_suggestion(attr.span, "remove the attribute", "", Applicability::MachineApplicable);
+ },
+ );
+ } else if attr.value_str().is_none() && is_must_use_ty(cx, return_ty(cx, item_id)) {
+ span_lint_and_help(
+ cx,
+ DOUBLE_MUST_USE,
+ fn_header_span,
+ "this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]`",
+ None,
+ "either add some descriptive text or remove the attribute",
+ );
+ }
+}
+
+fn check_must_use_candidate<'tcx>(
+ cx: &LateContext<'tcx>,
+ decl: &'tcx hir::FnDecl<'_>,
+ body: &'tcx hir::Body<'_>,
+ item_span: Span,
+ item_id: LocalDefId,
+ fn_span: Span,
+ msg: &str,
+) {
+ if has_mutable_arg(cx, body)
+ || mutates_static(cx, body)
+ || in_external_macro(cx.sess(), item_span)
+ || returns_unit(decl)
+ || !cx.access_levels.is_exported(item_id)
+ || is_must_use_ty(cx, return_ty(cx, cx.tcx.hir().local_def_id_to_hir_id(item_id)))
+ {
+ return;
+ }
+ span_lint_and_then(cx, MUST_USE_CANDIDATE, fn_span, msg, |diag| {
+ if let Some(snippet) = snippet_opt(cx, fn_span) {
+ diag.span_suggestion(
+ fn_span,
+ "add the attribute",
+ format!("#[must_use] {snippet}"),
+ Applicability::MachineApplicable,
+ );
+ }
+ });
+}
+
+fn returns_unit(decl: &hir::FnDecl<'_>) -> bool {
+ match decl.output {
+ hir::FnRetTy::DefaultReturn(_) => true,
+ hir::FnRetTy::Return(ty) => match ty.kind {
+ hir::TyKind::Tup(tys) => tys.is_empty(),
+ hir::TyKind::Never => true,
+ _ => false,
+ },
+ }
+}
+
+fn has_mutable_arg(cx: &LateContext<'_>, body: &hir::Body<'_>) -> bool {
+ let mut tys = DefIdSet::default();
+ body.params.iter().any(|param| is_mutable_pat(cx, param.pat, &mut tys))
+}
+
+fn is_mutable_pat(cx: &LateContext<'_>, pat: &hir::Pat<'_>, tys: &mut DefIdSet) -> bool {
+ if let hir::PatKind::Wild = pat.kind {
+ return false; // ignore `_` patterns
+ }
+ if cx.tcx.has_typeck_results(pat.hir_id.owner.to_def_id()) {
+ is_mutable_ty(cx, cx.tcx.typeck(pat.hir_id.owner.def_id).pat_ty(pat), pat.span, tys)
+ } else {
+ false
+ }
+}
+
- || KNOWN_WRAPPER_TYS.iter().any(|path| match_def_path(cx, adt.did(), path))
++static KNOWN_WRAPPER_TYS: &[Symbol] = &[sym::Rc, sym::Arc];
+
+fn is_mutable_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, span: Span, tys: &mut DefIdSet) -> bool {
+ match *ty.kind() {
+ // primitive types are never mutable
+ ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str => false,
+ ty::Adt(adt, substs) => {
+ tys.insert(adt.did()) && !ty.is_freeze(cx.tcx.at(span), cx.param_env)
++ || KNOWN_WRAPPER_TYS
++ .iter()
++ .any(|&sym| cx.tcx.is_diagnostic_item(sym, adt.did()))
+ && substs.types().any(|ty| is_mutable_ty(cx, ty, span, tys))
+ },
+ ty::Tuple(substs) => substs.iter().any(|ty| is_mutable_ty(cx, ty, span, tys)),
+ ty::Array(ty, _) | ty::Slice(ty) => is_mutable_ty(cx, ty, span, tys),
+ ty::RawPtr(ty::TypeAndMut { ty, mutbl }) | ty::Ref(_, ty, mutbl) => {
+ mutbl == hir::Mutability::Mut || is_mutable_ty(cx, ty, span, tys)
+ },
+ // calling something constitutes a side effect, so return true on all callables
+ // also never calls need not be used, so return true for them, too
+ _ => true,
+ }
+}
+
+fn is_mutated_static(e: &hir::Expr<'_>) -> bool {
+ use hir::ExprKind::{Field, Index, Path};
+
+ match e.kind {
+ Path(QPath::Resolved(_, path)) => !matches!(path.res, Res::Local(_)),
+ Path(_) => true,
+ Field(inner, _) | Index(inner, _) => is_mutated_static(inner),
+ _ => false,
+ }
+}
+
+fn mutates_static<'tcx>(cx: &LateContext<'tcx>, body: &'tcx hir::Body<'_>) -> bool {
+ for_each_expr(body.value, |e| {
+ use hir::ExprKind::{AddrOf, Assign, AssignOp, Call, MethodCall};
+
+ match e.kind {
+ Call(_, args) => {
+ let mut tys = DefIdSet::default();
+ for arg in args {
+ if cx.tcx.has_typeck_results(arg.hir_id.owner.to_def_id())
+ && is_mutable_ty(
+ cx,
+ cx.tcx.typeck(arg.hir_id.owner.def_id).expr_ty(arg),
+ arg.span,
+ &mut tys,
+ )
+ && is_mutated_static(arg)
+ {
+ return ControlFlow::Break(());
+ }
+ tys.clear();
+ }
+ ControlFlow::Continue(())
+ },
+ MethodCall(_, receiver, args, _) => {
+ let mut tys = DefIdSet::default();
+ for arg in std::iter::once(receiver).chain(args.iter()) {
+ if cx.tcx.has_typeck_results(arg.hir_id.owner.to_def_id())
+ && is_mutable_ty(
+ cx,
+ cx.tcx.typeck(arg.hir_id.owner.def_id).expr_ty(arg),
+ arg.span,
+ &mut tys,
+ )
+ && is_mutated_static(arg)
+ {
+ return ControlFlow::Break(());
+ }
+ tys.clear();
+ }
+ ControlFlow::Continue(())
+ },
+ Assign(target, ..) | AssignOp(_, target, _) | AddrOf(_, hir::Mutability::Mut, target)
+ if is_mutated_static(target) =>
+ {
+ ControlFlow::Break(())
+ },
+ _ => ControlFlow::Continue(()),
+ }
+ })
+ .is_some()
+}
--- /dev/null
- let code_snippet = match snippet_opt(cx, body.value.span) {
- Some(s) => s,
- _ => return,
+use rustc_hir as hir;
+use rustc_hir::intravisit::FnKind;
+use rustc_lint::{LateContext, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_span::Span;
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::source::snippet_opt;
+
+use super::TOO_MANY_LINES;
+
+pub(super) fn check_fn(
+ cx: &LateContext<'_>,
+ kind: FnKind<'_>,
+ span: Span,
+ body: &hir::Body<'_>,
+ too_many_lines_threshold: u64,
+) {
+ // Closures must be contained in a parent body, which will be checked for `too_many_lines`.
+ // Don't check closures for `too_many_lines` to avoid duplicated lints.
+ if matches!(kind, FnKind::Closure) || in_external_macro(cx.sess(), span) {
+ return;
+ }
+
++ let Some(code_snippet) = snippet_opt(cx, body.value.span) else {
++ return
+ };
+ let mut line_count: u64 = 0;
+ let mut in_comment = false;
+ let mut code_in_line;
+
+ let function_lines = if matches!(body.value.kind, hir::ExprKind::Block(..))
+ && code_snippet.as_bytes().first().copied() == Some(b'{')
+ && code_snippet.as_bytes().last().copied() == Some(b'}')
+ {
+ // Removing the braces from the enclosing block
+ &code_snippet[1..code_snippet.len() - 1]
+ } else {
+ &code_snippet
+ }
+ .trim() // Remove leading and trailing blank lines
+ .lines();
+
+ for mut line in function_lines {
+ code_in_line = false;
+ loop {
+ line = line.trim_start();
+ if line.is_empty() {
+ break;
+ }
+ if in_comment {
+ if let Some(i) = line.find("*/") {
+ line = &line[i + 2..];
+ in_comment = false;
+ continue;
+ }
+ } else {
+ let multi_idx = line.find("/*").unwrap_or(line.len());
+ let single_idx = line.find("//").unwrap_or(line.len());
+ code_in_line |= multi_idx > 0 && single_idx > 0;
+ // Implies multi_idx is below line.len()
+ if multi_idx < single_idx {
+ line = &line[multi_idx + 2..];
+ in_comment = true;
+ continue;
+ }
+ }
+ break;
+ }
+ if code_in_line {
+ line_count += 1;
+ }
+ }
+
+ if line_count > too_many_lines_threshold {
+ span_lint(
+ cx,
+ TOO_MANY_LINES,
+ span,
+ &format!("this function has too many lines ({line_count}/{too_many_lines_threshold})"),
+ );
+ }
+}
--- /dev/null
- pedantic,
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::{higher, is_integer_literal, peel_blocks_with_stmt, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for implicit saturating subtraction.
+ ///
+ /// ### Why is this bad?
+ /// Simplicity and readability. Instead we can easily use an builtin function.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let end: u32 = 10;
+ /// # let start: u32 = 5;
+ /// let mut i: u32 = end - start;
+ ///
+ /// if i != 0 {
+ /// i -= 1;
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let end: u32 = 10;
+ /// # let start: u32 = 5;
+ /// let mut i: u32 = end - start;
+ ///
+ /// i = i.saturating_sub(1);
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub IMPLICIT_SATURATING_SUB,
++ style,
+ "Perform saturating subtraction instead of implicitly checking lower bound of data type"
+}
+
+declare_lint_pass!(ImplicitSaturatingSub => [IMPLICIT_SATURATING_SUB]);
+
+impl<'tcx> LateLintPass<'tcx> for ImplicitSaturatingSub {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+ if_chain! {
+ if let Some(higher::If { cond, then, r#else: None }) = higher::If::hir(expr);
+
+ // Check if the conditional expression is a binary operation
+ if let ExprKind::Binary(ref cond_op, cond_left, cond_right) = cond.kind;
+
+ // Ensure that the binary operator is >, !=, or <
+ if BinOpKind::Ne == cond_op.node || BinOpKind::Gt == cond_op.node || BinOpKind::Lt == cond_op.node;
+
+ // Check if assign operation is done
+ if let Some(target) = subtracts_one(cx, then);
+
+ // Extracting out the variable name
+ if let ExprKind::Path(QPath::Resolved(_, ares_path)) = target.kind;
+
+ then {
+ // Handle symmetric conditions in the if statement
+ let (cond_var, cond_num_val) = if SpanlessEq::new(cx).eq_expr(cond_left, target) {
+ if BinOpKind::Gt == cond_op.node || BinOpKind::Ne == cond_op.node {
+ (cond_left, cond_right)
+ } else {
+ return;
+ }
+ } else if SpanlessEq::new(cx).eq_expr(cond_right, target) {
+ if BinOpKind::Lt == cond_op.node || BinOpKind::Ne == cond_op.node {
+ (cond_right, cond_left)
+ } else {
+ return;
+ }
+ } else {
+ return;
+ };
+
+ // Check if the variable in the condition statement is an integer
+ if !cx.typeck_results().expr_ty(cond_var).is_integral() {
+ return;
+ }
+
+ // Get the variable name
+ let var_name = ares_path.segments[0].ident.name.as_str();
+ match cond_num_val.kind {
+ ExprKind::Lit(ref cond_lit) => {
+ // Check if the constant is zero
+ if let LitKind::Int(0, _) = cond_lit.node {
+ if cx.typeck_results().expr_ty(cond_left).is_signed() {
+ } else {
+ print_lint_and_sugg(cx, var_name, expr);
+ };
+ }
+ },
+ ExprKind::Path(QPath::TypeRelative(_, name)) => {
+ if_chain! {
+ if name.ident.as_str() == "MIN";
+ if let Some(const_id) = cx.typeck_results().type_dependent_def_id(cond_num_val.hir_id);
+ if let Some(impl_id) = cx.tcx.impl_of_method(const_id);
+ if let None = cx.tcx.impl_trait_ref(impl_id); // An inherent impl
+ if cx.tcx.type_of(impl_id).is_integral();
+ then {
+ print_lint_and_sugg(cx, var_name, expr)
+ }
+ }
+ },
+ ExprKind::Call(func, []) => {
+ if_chain! {
+ if let ExprKind::Path(QPath::TypeRelative(_, name)) = func.kind;
+ if name.ident.as_str() == "min_value";
+ if let Some(func_id) = cx.typeck_results().type_dependent_def_id(func.hir_id);
+ if let Some(impl_id) = cx.tcx.impl_of_method(func_id);
+ if let None = cx.tcx.impl_trait_ref(impl_id); // An inherent impl
+ if cx.tcx.type_of(impl_id).is_integral();
+ then {
+ print_lint_and_sugg(cx, var_name, expr)
+ }
+ }
+ },
+ _ => (),
+ }
+ }
+ }
+ }
+}
+
+fn subtracts_one<'a>(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<&'a Expr<'a>> {
+ match peel_blocks_with_stmt(expr).kind {
+ ExprKind::AssignOp(ref op1, target, value) => {
+ // Check if literal being subtracted is one
+ (BinOpKind::Sub == op1.node && is_integer_literal(value, 1)).then_some(target)
+ },
+ ExprKind::Assign(target, value, _) => {
+ if_chain! {
+ if let ExprKind::Binary(ref op1, left1, right1) = value.kind;
+ if BinOpKind::Sub == op1.node;
+
+ if SpanlessEq::new(cx).eq_expr(left1, target);
+
+ if is_integer_literal(right1, 1);
+ then {
+ Some(target)
+ } else {
+ None
+ }
+ }
+ },
+ _ => None,
+ }
+}
+
+fn print_lint_and_sugg(cx: &LateContext<'_>, var_name: &str, expr: &Expr<'_>) {
+ span_lint_and_sugg(
+ cx,
+ IMPLICIT_SATURATING_SUB,
+ expr.span,
+ "implicitly performing saturating subtraction",
+ "try",
+ format!("{var_name} = {var_name}.saturating_sub({});", '1'),
+ Applicability::MachineApplicable,
+ );
+}
--- /dev/null
- let (rel, normalized_lhs, normalized_rhs) = if let Some(val) = normalized {
- val
- } else {
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::{self, IntTy, UintTy};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::Span;
+
+use clippy_utils::comparisons;
+use clippy_utils::comparisons::Rel;
+use clippy_utils::consts::{constant_full_int, FullInt};
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::source::snippet;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons where the relation is always either
+ /// true or false, but where one side has been upcast so that the comparison is
+ /// necessary. Only integer types are checked.
+ ///
+ /// ### Why is this bad?
+ /// An expression like `let x : u8 = ...; (x as u32) > 300`
+ /// will mistakenly imply that it is possible for `x` to be outside the range of
+ /// `u8`.
+ ///
+ /// ### Known problems
+ /// https://github.com/rust-lang/rust-clippy/issues/886
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: u8 = 1;
+ /// (x as u32) > 300;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INVALID_UPCAST_COMPARISONS,
+ pedantic,
+ "a comparison involving an upcast which is always true or false"
+}
+
+declare_lint_pass!(InvalidUpcastComparisons => [INVALID_UPCAST_COMPARISONS]);
+
+fn numeric_cast_precast_bounds<'a>(cx: &LateContext<'_>, expr: &'a Expr<'_>) -> Option<(FullInt, FullInt)> {
+ if let ExprKind::Cast(cast_exp, _) = expr.kind {
+ let pre_cast_ty = cx.typeck_results().expr_ty(cast_exp);
+ let cast_ty = cx.typeck_results().expr_ty(expr);
+ // if it's a cast from i32 to u32 wrapping will invalidate all these checks
+ if cx.layout_of(pre_cast_ty).ok().map(|l| l.size) == cx.layout_of(cast_ty).ok().map(|l| l.size) {
+ return None;
+ }
+ match pre_cast_ty.kind() {
+ ty::Int(int_ty) => Some(match int_ty {
+ IntTy::I8 => (FullInt::S(i128::from(i8::MIN)), FullInt::S(i128::from(i8::MAX))),
+ IntTy::I16 => (FullInt::S(i128::from(i16::MIN)), FullInt::S(i128::from(i16::MAX))),
+ IntTy::I32 => (FullInt::S(i128::from(i32::MIN)), FullInt::S(i128::from(i32::MAX))),
+ IntTy::I64 => (FullInt::S(i128::from(i64::MIN)), FullInt::S(i128::from(i64::MAX))),
+ IntTy::I128 => (FullInt::S(i128::MIN), FullInt::S(i128::MAX)),
+ IntTy::Isize => (FullInt::S(isize::MIN as i128), FullInt::S(isize::MAX as i128)),
+ }),
+ ty::Uint(uint_ty) => Some(match uint_ty {
+ UintTy::U8 => (FullInt::U(u128::from(u8::MIN)), FullInt::U(u128::from(u8::MAX))),
+ UintTy::U16 => (FullInt::U(u128::from(u16::MIN)), FullInt::U(u128::from(u16::MAX))),
+ UintTy::U32 => (FullInt::U(u128::from(u32::MIN)), FullInt::U(u128::from(u32::MAX))),
+ UintTy::U64 => (FullInt::U(u128::from(u64::MIN)), FullInt::U(u128::from(u64::MAX))),
+ UintTy::U128 => (FullInt::U(u128::MIN), FullInt::U(u128::MAX)),
+ UintTy::Usize => (FullInt::U(usize::MIN as u128), FullInt::U(usize::MAX as u128)),
+ }),
+ _ => None,
+ }
+ } else {
+ None
+ }
+}
+
+fn err_upcast_comparison(cx: &LateContext<'_>, span: Span, expr: &Expr<'_>, always: bool) {
+ if let ExprKind::Cast(cast_val, _) = expr.kind {
+ span_lint(
+ cx,
+ INVALID_UPCAST_COMPARISONS,
+ span,
+ &format!(
+ "because of the numeric bounds on `{}` prior to casting, this expression is always {}",
+ snippet(cx, cast_val.span, "the expression"),
+ if always { "true" } else { "false" },
+ ),
+ );
+ }
+}
+
+fn upcast_comparison_bounds_err<'tcx>(
+ cx: &LateContext<'tcx>,
+ span: Span,
+ rel: comparisons::Rel,
+ lhs_bounds: Option<(FullInt, FullInt)>,
+ lhs: &'tcx Expr<'_>,
+ rhs: &'tcx Expr<'_>,
+ invert: bool,
+) {
+ if let Some((lb, ub)) = lhs_bounds {
+ if let Some(norm_rhs_val) = constant_full_int(cx, cx.typeck_results(), rhs) {
+ if rel == Rel::Eq || rel == Rel::Ne {
+ if norm_rhs_val < lb || norm_rhs_val > ub {
+ err_upcast_comparison(cx, span, lhs, rel == Rel::Ne);
+ }
+ } else if match rel {
+ Rel::Lt => {
+ if invert {
+ norm_rhs_val < lb
+ } else {
+ ub < norm_rhs_val
+ }
+ },
+ Rel::Le => {
+ if invert {
+ norm_rhs_val <= lb
+ } else {
+ ub <= norm_rhs_val
+ }
+ },
+ Rel::Eq | Rel::Ne => unreachable!(),
+ } {
+ err_upcast_comparison(cx, span, lhs, true);
+ } else if match rel {
+ Rel::Lt => {
+ if invert {
+ norm_rhs_val >= ub
+ } else {
+ lb >= norm_rhs_val
+ }
+ },
+ Rel::Le => {
+ if invert {
+ norm_rhs_val > ub
+ } else {
+ lb > norm_rhs_val
+ }
+ },
+ Rel::Eq | Rel::Ne => unreachable!(),
+ } {
+ err_upcast_comparison(cx, span, lhs, false);
+ }
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for InvalidUpcastComparisons {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Binary(ref cmp, lhs, rhs) = expr.kind {
+ let normalized = comparisons::normalize_comparison(cmp.node, lhs, rhs);
++ let Some((rel, normalized_lhs, normalized_rhs)) = normalized else {
+ return;
+ };
+
+ let lhs_bounds = numeric_cast_precast_bounds(cx, normalized_lhs);
+ let rhs_bounds = numeric_cast_precast_bounds(cx, normalized_rhs);
+
+ upcast_comparison_bounds_err(cx, expr.span, rel, lhs_bounds, normalized_lhs, normalized_rhs, false);
+ upcast_comparison_bounds_err(cx, expr.span, rel, rhs_bounds, normalized_rhs, normalized_lhs, true);
+ }
+ }
+}
--- /dev/null
- let (adt, subst) = match ty.kind() {
- Adt(adt, subst) => (adt, subst),
- _ => panic!("already checked whether this is an enum"),
+//! lint when there is a large size difference between variants on an enum
+
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{diagnostics::span_lint_and_then, ty::approx_ty_size, ty::is_copy};
+use rustc_errors::Applicability;
+use rustc_hir::{Item, ItemKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{Adt, AdtDef, GenericArg, List, Ty};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for large size differences between variants on
+ /// `enum`s.
+ ///
+ /// ### Why is this bad?
+ /// Enum size is bounded by the largest variant. Having one
+ /// large variant can penalize the memory layout of that enum.
+ ///
+ /// ### Known problems
+ /// This lint obviously cannot take the distribution of
+ /// variants in your running program into account. It is possible that the
+ /// smaller variants make up less than 1% of all instances, in which case
+ /// the overhead is negligible and the boxing is counter-productive. Always
+ /// measure the change this lint suggests.
+ ///
+ /// For types that implement `Copy`, the suggestion to `Box` a variant's
+ /// data would require removing the trait impl. The types can of course
+ /// still be `Clone`, but that is worse ergonomically. Depending on the
+ /// use case it may be possible to store the large data in an auxiliary
+ /// structure (e.g. Arena or ECS).
+ ///
+ /// The lint will ignore the impact of generic types to the type layout by
+ /// assuming every type parameter is zero-sized. Depending on your use case,
+ /// this may lead to a false positive.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Test {
+ /// A(i32),
+ /// B([i32; 8000]),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// // Possibly better
+ /// enum Test2 {
+ /// A(i32),
+ /// B(Box<[i32; 8000]>),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LARGE_ENUM_VARIANT,
+ perf,
+ "large size difference between variants on an enum"
+}
+
+#[derive(Copy, Clone)]
+pub struct LargeEnumVariant {
+ maximum_size_difference_allowed: u64,
+}
+
+impl LargeEnumVariant {
+ #[must_use]
+ pub fn new(maximum_size_difference_allowed: u64) -> Self {
+ Self {
+ maximum_size_difference_allowed,
+ }
+ }
+}
+
+struct FieldInfo {
+ ind: usize,
+ size: u64,
+}
+
+struct VariantInfo {
+ ind: usize,
+ size: u64,
+ fields_size: Vec<FieldInfo>,
+}
+
+fn variants_size<'tcx>(
+ cx: &LateContext<'tcx>,
+ adt: AdtDef<'tcx>,
+ subst: &'tcx List<GenericArg<'tcx>>,
+) -> Vec<VariantInfo> {
+ let mut variants_size = adt
+ .variants()
+ .iter()
+ .enumerate()
+ .map(|(i, variant)| {
+ let mut fields_size = variant
+ .fields
+ .iter()
+ .enumerate()
+ .map(|(i, f)| FieldInfo {
+ ind: i,
+ size: approx_ty_size(cx, f.ty(cx.tcx, subst)),
+ })
+ .collect::<Vec<_>>();
+ fields_size.sort_by(|a, b| (a.size.cmp(&b.size)));
+
+ VariantInfo {
+ ind: i,
+ size: fields_size.iter().map(|info| info.size).sum(),
+ fields_size,
+ }
+ })
+ .collect::<Vec<_>>();
+ variants_size.sort_by(|a, b| (b.size.cmp(&a.size)));
+ variants_size
+}
+
+impl_lint_pass!(LargeEnumVariant => [LARGE_ENUM_VARIANT]);
+
+impl<'tcx> LateLintPass<'tcx> for LargeEnumVariant {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &Item<'tcx>) {
+ if in_external_macro(cx.tcx.sess, item.span) {
+ return;
+ }
+ if let ItemKind::Enum(ref def, _) = item.kind {
+ let ty = cx.tcx.type_of(item.def_id);
++ let Adt(adt, subst) = ty.kind() else {
++ panic!("already checked whether this is an enum")
+ };
+ if adt.variants().len() <= 1 {
+ return;
+ }
+ let variants_size = variants_size(cx, *adt, subst);
+
+ let mut difference = variants_size[0].size - variants_size[1].size;
+ if difference > self.maximum_size_difference_allowed {
+ let help_text = "consider boxing the large fields to reduce the total size of the enum";
+ span_lint_and_then(
+ cx,
+ LARGE_ENUM_VARIANT,
+ item.span,
+ "large size difference between variants",
+ |diag| {
+ diag.span_label(
+ item.span,
+ format!("the entire enum is at least {} bytes", approx_ty_size(cx, ty)),
+ );
+ diag.span_label(
+ def.variants[variants_size[0].ind].span,
+ format!("the largest variant contains at least {} bytes", variants_size[0].size),
+ );
+ diag.span_label(
+ def.variants[variants_size[1].ind].span,
+ &if variants_size[1].fields_size.is_empty() {
+ "the second-largest variant carries no data at all".to_owned()
+ } else {
+ format!(
+ "the second-largest variant contains at least {} bytes",
+ variants_size[1].size
+ )
+ },
+ );
+
+ let fields = def.variants[variants_size[0].ind].data.fields();
+ let mut applicability = Applicability::MaybeIncorrect;
+ if is_copy(cx, ty) || maybe_copy(cx, ty) {
+ diag.span_note(
+ item.ident.span,
+ "boxing a variant would require the type no longer be `Copy`",
+ );
+ } else {
+ let sugg: Vec<(Span, String)> = variants_size[0]
+ .fields_size
+ .iter()
+ .rev()
+ .map_while(|val| {
+ if difference > self.maximum_size_difference_allowed {
+ difference = difference.saturating_sub(val.size);
+ Some((
+ fields[val.ind].ty.span,
+ format!(
+ "Box<{}>",
+ snippet_with_applicability(
+ cx,
+ fields[val.ind].ty.span,
+ "..",
+ &mut applicability
+ )
+ .into_owned()
+ ),
+ ))
+ } else {
+ None
+ }
+ })
+ .collect();
+
+ if !sugg.is_empty() {
+ diag.multipart_suggestion(help_text, sugg, Applicability::MaybeIncorrect);
+ return;
+ }
+ }
+ diag.span_help(def.variants[variants_size[0].ind].span, help_text);
+ },
+ );
+ }
+ }
+ }
+}
+
+fn maybe_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ if let Adt(_def, substs) = ty.kind()
+ && substs.types().next().is_some()
+ && let Some(copy_trait) = cx.tcx.lang_items().copy_trait()
+ {
+ return cx.tcx.non_blanket_impls_for_ty(copy_trait, ty).next().is_some();
+ }
+ false
+}
--- /dev/null
- use clippy_utils::ty::{is_must_use_ty, match_type};
+use clippy_utils::diagnostics::span_lint_and_help;
- const SYNC_GUARD_PATHS: [&[&str]; 6] = [
- &paths::MUTEX_GUARD,
- &paths::RWLOCK_READ_GUARD,
- &paths::RWLOCK_WRITE_GUARD,
++use clippy_utils::ty::{is_must_use_ty, is_type_diagnostic_item, match_type};
+use clippy_utils::{is_must_use_func_call, paths};
+use if_chain::if_chain;
+use rustc_hir::{Local, PatKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::subst::GenericArgKind;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::{sym, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `let _ = <expr>` where expr is `#[must_use]`
+ ///
+ /// ### Why is this bad?
+ /// It's better to explicitly handle the value of a `#[must_use]`
+ /// expr
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn f() -> Result<u32, u32> {
+ /// Ok(0)
+ /// }
+ ///
+ /// let _ = f();
+ /// // is_ok() is marked #[must_use]
+ /// let _ = f().is_ok();
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub LET_UNDERSCORE_MUST_USE,
+ restriction,
+ "non-binding let on a `#[must_use]` expression"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `let _ = sync_lock`.
+ /// This supports `mutex` and `rwlock` in `std::sync` and `parking_lot`.
+ ///
+ /// ### Why is this bad?
+ /// This statement immediately drops the lock instead of
+ /// extending its lifetime to the end of the scope, which is often not intended.
+ /// To extend lock lifetime to the end of the scope, use an underscore-prefixed
+ /// name instead (i.e. _lock). If you want to explicitly drop the lock,
+ /// `std::mem::drop` conveys your intention better and is less error-prone.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let _ = mutex.lock();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// let _lock = mutex.lock();
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub LET_UNDERSCORE_LOCK,
+ correctness,
+ "non-binding let on a synchronization lock"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `let _ = <expr>`
+ /// where expr has a type that implements `Drop`
+ ///
+ /// ### Why is this bad?
+ /// This statement immediately drops the initializer
+ /// expression instead of extending its lifetime to the end of the scope, which
+ /// is often not intended. To extend the expression's lifetime to the end of the
+ /// scope, use an underscore-prefixed name instead (i.e. _var). If you want to
+ /// explicitly drop the expression, `std::mem::drop` conveys your intention
+ /// better and is less error-prone.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct DroppableItem;
+ /// {
+ /// let _ = DroppableItem;
+ /// // ^ dropped here
+ /// /* more code */
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # struct DroppableItem;
+ /// {
+ /// let _droppable = DroppableItem;
+ /// /* more code */
+ /// // dropped at end of scope
+ /// }
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub LET_UNDERSCORE_DROP,
+ pedantic,
+ "non-binding let on a type that implements `Drop`"
+}
+
+declare_lint_pass!(LetUnderscore => [LET_UNDERSCORE_MUST_USE, LET_UNDERSCORE_LOCK, LET_UNDERSCORE_DROP]);
+
- SYNC_GUARD_PATHS.iter().any(|path| match_type(cx, inner_ty, path))
++const SYNC_GUARD_SYMS: [Symbol; 3] = [sym::MutexGuard, sym::RwLockReadGuard, sym::RwLockWriteGuard];
++
++const SYNC_GUARD_PATHS: [&[&str]; 3] = [
+ &paths::PARKING_LOT_MUTEX_GUARD,
+ &paths::PARKING_LOT_RWLOCK_READ_GUARD,
+ &paths::PARKING_LOT_RWLOCK_WRITE_GUARD,
+];
+
+impl<'tcx> LateLintPass<'tcx> for LetUnderscore {
+ fn check_local(&mut self, cx: &LateContext<'_>, local: &Local<'_>) {
+ if in_external_macro(cx.tcx.sess, local.span) {
+ return;
+ }
+
+ if_chain! {
+ if let PatKind::Wild = local.pat.kind;
+ if let Some(init) = local.init;
+ then {
+ let init_ty = cx.typeck_results().expr_ty(init);
+ let contains_sync_guard = init_ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => {
- binding or dropping explicitly with `std::mem::drop`"
++ SYNC_GUARD_SYMS
++ .iter()
++ .any(|&sym| is_type_diagnostic_item(cx, inner_ty, sym))
++ || SYNC_GUARD_PATHS.iter().any(|path| match_type(cx, inner_ty, path))
+ },
+
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ });
+ if contains_sync_guard {
+ span_lint_and_help(
+ cx,
+ LET_UNDERSCORE_LOCK,
+ local.span,
+ "non-binding let on a synchronization lock",
+ None,
+ "consider using an underscore-prefixed named \
- binding or dropping explicitly with `std::mem::drop`"
++ binding or dropping explicitly with `std::mem::drop`",
+ );
+ } else if init_ty.needs_drop(cx.tcx, cx.param_env) {
+ span_lint_and_help(
+ cx,
+ LET_UNDERSCORE_DROP,
+ local.span,
+ "non-binding `let` on a type that implements `Drop`",
+ None,
+ "consider using an underscore-prefixed named \
- "consider explicitly using expression value"
++ binding or dropping explicitly with `std::mem::drop`",
+ );
+ } else if is_must_use_ty(cx, cx.typeck_results().expr_ty(init)) {
+ span_lint_and_help(
+ cx,
+ LET_UNDERSCORE_MUST_USE,
+ local.span,
+ "non-binding let on an expression with `#[must_use]` type",
+ None,
- "consider explicitly using function result"
++ "consider explicitly using expression value",
+ );
+ } else if is_must_use_func_call(cx, init) {
+ span_lint_and_help(
+ cx,
+ LET_UNDERSCORE_MUST_USE,
+ local.span,
+ "non-binding let on a result of a `#[must_use]` function",
+ None,
++ "consider explicitly using function result",
+ );
+ }
+ }
+ }
+ }
+}
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::all", Some("clippy_all"), vec![
+ LintId::of(almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE),
+ LintId::of(approx_const::APPROX_CONSTANT),
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
+ LintId::of(async_yields_async::ASYNC_YIELDS_ASYNC),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(attrs::DEPRECATED_SEMVER),
+ LintId::of(attrs::MISMATCHED_TARGET_OS),
+ LintId::of(attrs::USELESS_ATTRIBUTE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(bool_to_int_with_if::BOOL_TO_INT_WITH_IF),
+ LintId::of(booleans::NONMINIMAL_BOOL),
+ LintId::of(booleans::OVERLY_COMPLEX_BOOL_EXPR),
+ LintId::of(borrow_deref_ref::BORROW_DEREF_REF),
+ LintId::of(box_default::BOX_DEFAULT),
+ LintId::of(casts::CAST_ABS_TO_UNSIGNED),
+ LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
+ LintId::of(casts::CAST_ENUM_TRUNCATION),
++ LintId::of(casts::CAST_NAN_TO_INT),
+ LintId::of(casts::CAST_REF_TO_MUT),
+ LintId::of(casts::CAST_SLICE_DIFFERENT_SIZES),
+ LintId::of(casts::CAST_SLICE_FROM_RAW_PARTS),
+ LintId::of(casts::CHAR_LIT_AS_U8),
+ LintId::of(casts::FN_TO_NUMERIC_CAST),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
+ LintId::of(casts::UNNECESSARY_CAST),
+ LintId::of(collapsible_if::COLLAPSIBLE_ELSE_IF),
+ LintId::of(collapsible_if::COLLAPSIBLE_IF),
+ LintId::of(comparison_chain::COMPARISON_CHAIN),
+ LintId::of(copies::IFS_SAME_COND),
+ LintId::of(copies::IF_SAME_THEN_ELSE),
+ LintId::of(crate_in_macro_def::CRATE_IN_MACRO_DEF),
+ LintId::of(default::FIELD_REASSIGN_WITH_DEFAULT),
+ LintId::of(default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY),
+ LintId::of(dereference::EXPLICIT_AUTO_DEREF),
+ LintId::of(dereference::NEEDLESS_BORROW),
+ LintId::of(derivable_impls::DERIVABLE_IMPLS),
+ LintId::of(derive::DERIVE_HASH_XOR_EQ),
+ LintId::of(derive::DERIVE_ORD_XOR_PARTIAL_ORD),
+ LintId::of(disallowed_macros::DISALLOWED_MACROS),
+ LintId::of(disallowed_methods::DISALLOWED_METHODS),
+ LintId::of(disallowed_names::DISALLOWED_NAMES),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(drop_forget_ref::DROP_COPY),
+ LintId::of(drop_forget_ref::DROP_NON_DROP),
+ LintId::of(drop_forget_ref::DROP_REF),
+ LintId::of(drop_forget_ref::FORGET_COPY),
+ LintId::of(drop_forget_ref::FORGET_NON_DROP),
+ LintId::of(drop_forget_ref::FORGET_REF),
+ LintId::of(drop_forget_ref::UNDROPPED_MANUALLY_DROPS),
+ LintId::of(duplicate_mod::DUPLICATE_MOD),
+ LintId::of(entry::MAP_ENTRY),
+ LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(escape::BOXED_LOCAL),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(format::USELESS_FORMAT),
+ LintId::of(format_args::FORMAT_IN_FORMAT_ARGS),
+ LintId::of(format_args::TO_STRING_IN_FORMAT_ARGS),
++ LintId::of(format_args::UNINLINED_FORMAT_ARGS),
++ LintId::of(format_args::UNUSED_FORMAT_SPECS),
+ LintId::of(format_impl::PRINT_IN_FORMAT_IMPL),
+ LintId::of(format_impl::RECURSIVE_FORMAT_IMPL),
+ LintId::of(formatting::POSSIBLE_MISSING_COMMA),
+ LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+ LintId::of(from_over_into::FROM_OVER_INTO),
+ LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
+ LintId::of(functions::DOUBLE_MUST_USE),
+ LintId::of(functions::MUST_USE_UNIT),
+ LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF),
+ LintId::of(functions::RESULT_LARGE_ERR),
+ LintId::of(functions::RESULT_UNIT_ERR),
+ LintId::of(functions::TOO_MANY_ARGUMENTS),
+ LintId::of(if_let_mutex::IF_LET_MUTEX),
+ LintId::of(implicit_saturating_add::IMPLICIT_SATURATING_ADD),
++ LintId::of(implicit_saturating_sub::IMPLICIT_SATURATING_SUB),
+ LintId::of(indexing_slicing::OUT_OF_BOUNDS_INDEXING),
+ LintId::of(infinite_iter::INFINITE_ITER),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY),
+ LintId::of(init_numbered_fields::INIT_NUMBERED_FIELDS),
+ LintId::of(inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
+ LintId::of(int_plus_one::INT_PLUS_ONE),
+ LintId::of(invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED),
+ LintId::of(large_const_arrays::LARGE_CONST_ARRAYS),
+ LintId::of(large_enum_variant::LARGE_ENUM_VARIANT),
+ LintId::of(len_zero::COMPARISON_TO_EMPTY),
+ LintId::of(len_zero::LEN_WITHOUT_IS_EMPTY),
+ LintId::of(len_zero::LEN_ZERO),
+ LintId::of(let_underscore::LET_UNDERSCORE_LOCK),
+ LintId::of(lifetimes::EXTRA_UNUSED_LIFETIMES),
+ LintId::of(lifetimes::NEEDLESS_LIFETIMES),
+ LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
+ LintId::of(literal_representation::MISTYPED_LITERAL_SUFFIXES),
+ LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
+ LintId::of(loops::EMPTY_LOOP),
+ LintId::of(loops::EXPLICIT_COUNTER_LOOP),
+ LintId::of(loops::FOR_KV_MAP),
+ LintId::of(loops::ITER_NEXT_LOOP),
+ LintId::of(loops::MANUAL_FIND),
+ LintId::of(loops::MANUAL_FLATTEN),
+ LintId::of(loops::MANUAL_MEMCPY),
+ LintId::of(loops::MISSING_SPIN_LOOP),
+ LintId::of(loops::MUT_RANGE_BOUND),
+ LintId::of(loops::NEEDLESS_COLLECT),
+ LintId::of(loops::NEEDLESS_RANGE_LOOP),
+ LintId::of(loops::NEVER_LOOP),
+ LintId::of(loops::SAME_ITEM_PUSH),
+ LintId::of(loops::SINGLE_ELEMENT_LOOP),
+ LintId::of(loops::WHILE_IMMUTABLE_CONDITION),
+ LintId::of(loops::WHILE_LET_LOOP),
+ LintId::of(loops::WHILE_LET_ON_ITERATOR),
+ LintId::of(main_recursion::MAIN_RECURSION),
+ LintId::of(manual_async_fn::MANUAL_ASYNC_FN),
+ LintId::of(manual_bits::MANUAL_BITS),
+ LintId::of(manual_clamp::MANUAL_CLAMP),
+ LintId::of(manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
+ LintId::of(manual_rem_euclid::MANUAL_REM_EUCLID),
+ LintId::of(manual_retain::MANUAL_RETAIN),
+ LintId::of(manual_strip::MANUAL_STRIP),
+ LintId::of(map_unit_fn::OPTION_MAP_UNIT_FN),
+ LintId::of(map_unit_fn::RESULT_MAP_UNIT_FN),
+ LintId::of(match_result_ok::MATCH_RESULT_OK),
+ LintId::of(matches::COLLAPSIBLE_MATCH),
+ LintId::of(matches::INFALLIBLE_DESTRUCTURING_MATCH),
++ LintId::of(matches::MANUAL_FILTER),
+ LintId::of(matches::MANUAL_MAP),
+ LintId::of(matches::MANUAL_UNWRAP_OR),
+ LintId::of(matches::MATCH_AS_REF),
+ LintId::of(matches::MATCH_LIKE_MATCHES_MACRO),
+ LintId::of(matches::MATCH_OVERLAPPING_ARM),
+ LintId::of(matches::MATCH_REF_PATS),
+ LintId::of(matches::MATCH_SINGLE_BINDING),
+ LintId::of(matches::MATCH_STR_CASE_MISMATCH),
+ LintId::of(matches::NEEDLESS_MATCH),
+ LintId::of(matches::REDUNDANT_PATTERN_MATCHING),
+ LintId::of(matches::SINGLE_MATCH),
+ LintId::of(matches::WILDCARD_IN_OR_PATTERNS),
+ LintId::of(mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_DEFAULT),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_UNINIT),
+ LintId::of(methods::BIND_INSTEAD_OF_MAP),
+ LintId::of(methods::BYTES_COUNT_TO_LEN),
+ LintId::of(methods::BYTES_NTH),
+ LintId::of(methods::CHARS_LAST_CMP),
+ LintId::of(methods::CHARS_NEXT_CMP),
+ LintId::of(methods::CLONE_DOUBLE_REF),
+ LintId::of(methods::CLONE_ON_COPY),
+ LintId::of(methods::COLLAPSIBLE_STR_REPLACE),
+ LintId::of(methods::ERR_EXPECT),
+ LintId::of(methods::EXPECT_FUN_CALL),
+ LintId::of(methods::EXTEND_WITH_DRAIN),
+ LintId::of(methods::FILTER_MAP_IDENTITY),
+ LintId::of(methods::FILTER_NEXT),
+ LintId::of(methods::FLAT_MAP_IDENTITY),
+ LintId::of(methods::GET_FIRST),
+ LintId::of(methods::GET_LAST_WITH_LEN),
+ LintId::of(methods::INSPECT_FOR_EACH),
+ LintId::of(methods::INTO_ITER_ON_REF),
+ LintId::of(methods::IS_DIGIT_ASCII_RADIX),
+ LintId::of(methods::ITERATOR_STEP_BY_ZERO),
+ LintId::of(methods::ITER_CLONED_COLLECT),
+ LintId::of(methods::ITER_COUNT),
+ LintId::of(methods::ITER_KV_MAP),
+ LintId::of(methods::ITER_NEXT_SLICE),
+ LintId::of(methods::ITER_NTH),
+ LintId::of(methods::ITER_NTH_ZERO),
+ LintId::of(methods::ITER_OVEREAGER_CLONED),
+ LintId::of(methods::ITER_SKIP_NEXT),
+ LintId::of(methods::MANUAL_FILTER_MAP),
+ LintId::of(methods::MANUAL_FIND_MAP),
+ LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
+ LintId::of(methods::MANUAL_SPLIT_ONCE),
+ LintId::of(methods::MANUAL_STR_REPEAT),
+ LintId::of(methods::MAP_CLONE),
+ LintId::of(methods::MAP_COLLECT_RESULT_UNIT),
+ LintId::of(methods::MAP_FLATTEN),
+ LintId::of(methods::MAP_IDENTITY),
+ LintId::of(methods::MUT_MUTEX_LOCK),
+ LintId::of(methods::NEEDLESS_OPTION_AS_DEREF),
+ LintId::of(methods::NEEDLESS_OPTION_TAKE),
+ LintId::of(methods::NEEDLESS_SPLITN),
+ LintId::of(methods::NEW_RET_NO_SELF),
+ LintId::of(methods::NONSENSICAL_OPEN_OPTIONS),
+ LintId::of(methods::NO_EFFECT_REPLACE),
+ LintId::of(methods::OBFUSCATED_IF_ELSE),
+ LintId::of(methods::OK_EXPECT),
+ LintId::of(methods::OPTION_AS_REF_DEREF),
+ LintId::of(methods::OPTION_FILTER_MAP),
+ LintId::of(methods::OPTION_MAP_OR_NONE),
+ LintId::of(methods::OR_FUN_CALL),
+ LintId::of(methods::OR_THEN_UNWRAP),
+ LintId::of(methods::RANGE_ZIP_WITH_LEN),
+ LintId::of(methods::REPEAT_ONCE),
+ LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
+ LintId::of(methods::SEARCH_IS_SOME),
+ LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
+ LintId::of(methods::SINGLE_CHAR_ADD_STR),
+ LintId::of(methods::SINGLE_CHAR_PATTERN),
+ LintId::of(methods::SKIP_WHILE_NEXT),
+ LintId::of(methods::STRING_EXTEND_CHARS),
+ LintId::of(methods::SUSPICIOUS_MAP),
+ LintId::of(methods::SUSPICIOUS_SPLITN),
+ LintId::of(methods::SUSPICIOUS_TO_OWNED),
+ LintId::of(methods::UNINIT_ASSUMED_INIT),
+ LintId::of(methods::UNIT_HASH),
+ LintId::of(methods::UNNECESSARY_FILTER_MAP),
+ LintId::of(methods::UNNECESSARY_FIND_MAP),
+ LintId::of(methods::UNNECESSARY_FOLD),
+ LintId::of(methods::UNNECESSARY_LAZY_EVALUATIONS),
+ LintId::of(methods::UNNECESSARY_SORT_BY),
+ LintId::of(methods::UNNECESSARY_TO_OWNED),
+ LintId::of(methods::UNWRAP_OR_ELSE_DEFAULT),
+ LintId::of(methods::USELESS_ASREF),
+ LintId::of(methods::VEC_RESIZE_TO_ZERO),
+ LintId::of(methods::WRONG_SELF_CONVENTION),
+ LintId::of(methods::ZST_OFFSET),
+ LintId::of(minmax::MIN_MAX),
+ LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
+ LintId::of(misc::TOPLEVEL_REF_ARG),
+ LintId::of(misc::ZERO_PTR),
+ LintId::of(misc_early::BUILTIN_TYPE_SHADOW),
+ LintId::of(misc_early::DOUBLE_NEG),
+ LintId::of(misc_early::DUPLICATE_UNDERSCORE_ARGUMENT),
+ LintId::of(misc_early::MIXED_CASE_HEX_LITERALS),
+ LintId::of(misc_early::REDUNDANT_PATTERN),
+ LintId::of(misc_early::UNNEEDED_WILDCARD_PATTERN),
+ LintId::of(misc_early::ZERO_PREFIXED_LITERAL),
+ LintId::of(mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION),
+ LintId::of(multi_assignments::MULTI_ASSIGNMENTS),
+ LintId::of(mut_key::MUTABLE_KEY_TYPE),
+ LintId::of(mut_reference::UNNECESSARY_MUT_PASSED),
+ LintId::of(needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE),
+ LintId::of(needless_bool::BOOL_COMPARISON),
+ LintId::of(needless_bool::NEEDLESS_BOOL),
+ LintId::of(needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE),
+ LintId::of(needless_late_init::NEEDLESS_LATE_INIT),
+ LintId::of(needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS),
+ LintId::of(needless_question_mark::NEEDLESS_QUESTION_MARK),
+ LintId::of(needless_update::NEEDLESS_UPDATE),
+ LintId::of(neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD),
+ LintId::of(neg_multiply::NEG_MULTIPLY),
+ LintId::of(new_without_default::NEW_WITHOUT_DEFAULT),
+ LintId::of(no_effect::NO_EFFECT),
+ LintId::of(no_effect::UNNECESSARY_OPERATION),
+ LintId::of(non_copy_const::BORROW_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
+ LintId::of(non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS),
+ LintId::of(octal_escapes::OCTAL_ESCAPES),
+ LintId::of(only_used_in_recursion::ONLY_USED_IN_RECURSION),
+ LintId::of(operators::ABSURD_EXTREME_COMPARISONS),
+ LintId::of(operators::ASSIGN_OP_PATTERN),
+ LintId::of(operators::BAD_BIT_MASK),
+ LintId::of(operators::CMP_NAN),
+ LintId::of(operators::CMP_OWNED),
+ LintId::of(operators::DOUBLE_COMPARISONS),
+ LintId::of(operators::DURATION_SUBSEC),
+ LintId::of(operators::EQ_OP),
+ LintId::of(operators::ERASING_OP),
+ LintId::of(operators::FLOAT_EQUALITY_WITHOUT_ABS),
+ LintId::of(operators::IDENTITY_OP),
+ LintId::of(operators::INEFFECTIVE_BIT_MASK),
+ LintId::of(operators::MISREFACTORED_ASSIGN_OP),
+ LintId::of(operators::MODULO_ONE),
+ LintId::of(operators::OP_REF),
+ LintId::of(operators::PTR_EQ),
+ LintId::of(operators::SELF_ASSIGNMENT),
+ LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
+ LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
+ LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
+ LintId::of(partialeq_to_none::PARTIALEQ_TO_NONE),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::INVALID_NULL_PTR_USAGE),
+ LintId::of(ptr::MUT_FROM_REF),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(ranges::REVERSED_EMPTY_RANGES),
+ LintId::of(rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT),
+ LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
+ LintId::of(redundant_clone::REDUNDANT_CLONE),
+ LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_slicing::REDUNDANT_SLICING),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(reference::DEREF_ADDROF),
+ LintId::of(regex::INVALID_REGEX),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(serde_api::SERDE_API_MISUSE),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
+ LintId::of(slow_vector_initialization::SLOW_VECTOR_INITIALIZATION),
+ LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
+ LintId::of(strings::TRIM_SPLIT_WHITESPACE),
+ LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+ LintId::of(swap::ALMOST_SWAPPED),
+ LintId::of(swap::MANUAL_SWAP),
+ LintId::of(swap_ptr_to_ref::SWAP_PTR_TO_REF),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(temporary_assignment::TEMPORARY_ASSIGNMENT),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(transmute::CROSSPOINTER_TRANSMUTE),
+ LintId::of(transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS),
+ LintId::of(transmute::TRANSMUTE_BYTES_TO_STR),
+ LintId::of(transmute::TRANSMUTE_FLOAT_TO_INT),
+ LintId::of(transmute::TRANSMUTE_INT_TO_BOOL),
+ LintId::of(transmute::TRANSMUTE_INT_TO_CHAR),
+ LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
+ LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
+ LintId::of(transmute::TRANSMUTING_NULL),
+ LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
+ LintId::of(transmute::USELESS_TRANSMUTE),
+ LintId::of(transmute::WRONG_TRANSMUTE),
+ LintId::of(types::BORROWED_BOX),
+ LintId::of(types::BOX_COLLECTION),
+ LintId::of(types::REDUNDANT_ALLOCATION),
+ LintId::of(types::TYPE_COMPLEXITY),
+ LintId::of(types::VEC_BOX),
+ LintId::of(unicode::INVISIBLE_CHARACTERS),
+ LintId::of(uninit_vec::UNINIT_VEC),
+ LintId::of(unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD),
+ LintId::of(unit_types::LET_UNIT_VALUE),
+ LintId::of(unit_types::UNIT_ARG),
+ LintId::of(unit_types::UNIT_CMP),
+ LintId::of(unnamed_address::FN_ADDRESS_COMPARISONS),
+ LintId::of(unnamed_address::VTABLE_ADDRESS_COMPARISONS),
+ LintId::of(unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_io_amount::UNUSED_IO_AMOUNT),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(unwrap::PANICKING_UNWRAP),
+ LintId::of(unwrap::UNNECESSARY_UNWRAP),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(useless_conversion::USELESS_CONVERSION),
+ LintId::of(vec::USELESS_VEC),
+ LintId::of(vec_init_then_push::VEC_INIT_THEN_PUSH),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+ LintId::of(zero_div_zero::ZERO_DIVIDED_BY_ZERO),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::complexity", Some("clippy_complexity"), vec![
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(booleans::NONMINIMAL_BOOL),
+ LintId::of(borrow_deref_ref::BORROW_DEREF_REF),
+ LintId::of(casts::CHAR_LIT_AS_U8),
+ LintId::of(casts::UNNECESSARY_CAST),
+ LintId::of(dereference::EXPLICIT_AUTO_DEREF),
+ LintId::of(derivable_impls::DERIVABLE_IMPLS),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(format::USELESS_FORMAT),
++ LintId::of(format_args::UNUSED_FORMAT_SPECS),
+ LintId::of(functions::TOO_MANY_ARGUMENTS),
+ LintId::of(int_plus_one::INT_PLUS_ONE),
+ LintId::of(lifetimes::EXTRA_UNUSED_LIFETIMES),
+ LintId::of(lifetimes::NEEDLESS_LIFETIMES),
+ LintId::of(loops::EXPLICIT_COUNTER_LOOP),
+ LintId::of(loops::MANUAL_FIND),
+ LintId::of(loops::MANUAL_FLATTEN),
+ LintId::of(loops::SINGLE_ELEMENT_LOOP),
+ LintId::of(loops::WHILE_LET_LOOP),
+ LintId::of(manual_clamp::MANUAL_CLAMP),
+ LintId::of(manual_rem_euclid::MANUAL_REM_EUCLID),
+ LintId::of(manual_strip::MANUAL_STRIP),
+ LintId::of(map_unit_fn::OPTION_MAP_UNIT_FN),
+ LintId::of(map_unit_fn::RESULT_MAP_UNIT_FN),
++ LintId::of(matches::MANUAL_FILTER),
+ LintId::of(matches::MANUAL_UNWRAP_OR),
+ LintId::of(matches::MATCH_AS_REF),
+ LintId::of(matches::MATCH_SINGLE_BINDING),
+ LintId::of(matches::NEEDLESS_MATCH),
+ LintId::of(matches::WILDCARD_IN_OR_PATTERNS),
+ LintId::of(methods::BIND_INSTEAD_OF_MAP),
+ LintId::of(methods::BYTES_COUNT_TO_LEN),
+ LintId::of(methods::CLONE_ON_COPY),
+ LintId::of(methods::FILTER_MAP_IDENTITY),
+ LintId::of(methods::FILTER_NEXT),
+ LintId::of(methods::FLAT_MAP_IDENTITY),
+ LintId::of(methods::GET_LAST_WITH_LEN),
+ LintId::of(methods::INSPECT_FOR_EACH),
+ LintId::of(methods::ITER_COUNT),
+ LintId::of(methods::ITER_KV_MAP),
+ LintId::of(methods::MANUAL_FILTER_MAP),
+ LintId::of(methods::MANUAL_FIND_MAP),
+ LintId::of(methods::MANUAL_SPLIT_ONCE),
+ LintId::of(methods::MAP_FLATTEN),
+ LintId::of(methods::MAP_IDENTITY),
+ LintId::of(methods::NEEDLESS_OPTION_AS_DEREF),
+ LintId::of(methods::NEEDLESS_OPTION_TAKE),
+ LintId::of(methods::NEEDLESS_SPLITN),
+ LintId::of(methods::OPTION_AS_REF_DEREF),
+ LintId::of(methods::OPTION_FILTER_MAP),
+ LintId::of(methods::OR_THEN_UNWRAP),
+ LintId::of(methods::RANGE_ZIP_WITH_LEN),
+ LintId::of(methods::REPEAT_ONCE),
+ LintId::of(methods::SEARCH_IS_SOME),
+ LintId::of(methods::SKIP_WHILE_NEXT),
+ LintId::of(methods::UNNECESSARY_FILTER_MAP),
+ LintId::of(methods::UNNECESSARY_FIND_MAP),
+ LintId::of(methods::UNNECESSARY_SORT_BY),
+ LintId::of(methods::USELESS_ASREF),
+ LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
+ LintId::of(misc_early::UNNEEDED_WILDCARD_PATTERN),
+ LintId::of(misc_early::ZERO_PREFIXED_LITERAL),
+ LintId::of(mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION),
+ LintId::of(needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE),
+ LintId::of(needless_bool::BOOL_COMPARISON),
+ LintId::of(needless_bool::NEEDLESS_BOOL),
+ LintId::of(needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE),
+ LintId::of(needless_question_mark::NEEDLESS_QUESTION_MARK),
+ LintId::of(needless_update::NEEDLESS_UPDATE),
+ LintId::of(neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD),
+ LintId::of(no_effect::NO_EFFECT),
+ LintId::of(no_effect::UNNECESSARY_OPERATION),
+ LintId::of(only_used_in_recursion::ONLY_USED_IN_RECURSION),
+ LintId::of(operators::DOUBLE_COMPARISONS),
+ LintId::of(operators::DURATION_SUBSEC),
+ LintId::of(operators::IDENTITY_OP),
+ LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
+ LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
+ LintId::of(redundant_slicing::REDUNDANT_SLICING),
+ LintId::of(reference::DEREF_ADDROF),
+ LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
+ LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),
+ LintId::of(swap::MANUAL_SWAP),
+ LintId::of(temporary_assignment::TEMPORARY_ASSIGNMENT),
+ LintId::of(transmute::CROSSPOINTER_TRANSMUTE),
+ LintId::of(transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS),
+ LintId::of(transmute::TRANSMUTE_BYTES_TO_STR),
+ LintId::of(transmute::TRANSMUTE_FLOAT_TO_INT),
+ LintId::of(transmute::TRANSMUTE_INT_TO_BOOL),
+ LintId::of(transmute::TRANSMUTE_INT_TO_CHAR),
+ LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
+ LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
+ LintId::of(transmute::USELESS_TRANSMUTE),
+ LintId::of(types::BORROWED_BOX),
+ LintId::of(types::TYPE_COMPLEXITY),
+ LintId::of(types::VEC_BOX),
+ LintId::of(unit_types::UNIT_ARG),
+ LintId::of(unwrap::UNNECESSARY_UNWRAP),
+ LintId::of(useless_conversion::USELESS_CONVERSION),
+ LintId::of(zero_div_zero::ZERO_DIVIDED_BY_ZERO),
+])
--- /dev/null
- LintId::of(utils::internal_lints::CLIPPY_LINTS_INTERNAL),
- LintId::of(utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS),
- LintId::of(utils::internal_lints::COMPILER_LINT_FUNCTIONS),
- LintId::of(utils::internal_lints::DEFAULT_DEPRECATION_REASON),
- LintId::of(utils::internal_lints::DEFAULT_LINT),
- LintId::of(utils::internal_lints::IF_CHAIN_STYLE),
- LintId::of(utils::internal_lints::INTERNING_DEFINED_SYMBOL),
- LintId::of(utils::internal_lints::INVALID_CLIPPY_VERSION_ATTRIBUTE),
- LintId::of(utils::internal_lints::INVALID_PATHS),
- LintId::of(utils::internal_lints::LINT_WITHOUT_LINT_PASS),
- LintId::of(utils::internal_lints::MISSING_CLIPPY_VERSION_ATTRIBUTE),
- LintId::of(utils::internal_lints::MISSING_MSRV_ATTR_IMPL),
- LintId::of(utils::internal_lints::OUTER_EXPN_EXPN_DATA),
- LintId::of(utils::internal_lints::PRODUCE_ICE),
- LintId::of(utils::internal_lints::UNNECESSARY_DEF_PATH),
- LintId::of(utils::internal_lints::UNNECESSARY_SYMBOL_STR),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::internal", Some("clippy_internal"), vec![
++ LintId::of(utils::internal_lints::clippy_lints_internal::CLIPPY_LINTS_INTERNAL),
++ LintId::of(utils::internal_lints::collapsible_calls::COLLAPSIBLE_SPAN_LINT_CALLS),
++ LintId::of(utils::internal_lints::compiler_lint_functions::COMPILER_LINT_FUNCTIONS),
++ LintId::of(utils::internal_lints::if_chain_style::IF_CHAIN_STYLE),
++ LintId::of(utils::internal_lints::interning_defined_symbol::INTERNING_DEFINED_SYMBOL),
++ LintId::of(utils::internal_lints::interning_defined_symbol::UNNECESSARY_SYMBOL_STR),
++ LintId::of(utils::internal_lints::invalid_paths::INVALID_PATHS),
++ LintId::of(utils::internal_lints::lint_without_lint_pass::DEFAULT_DEPRECATION_REASON),
++ LintId::of(utils::internal_lints::lint_without_lint_pass::DEFAULT_LINT),
++ LintId::of(utils::internal_lints::lint_without_lint_pass::INVALID_CLIPPY_VERSION_ATTRIBUTE),
++ LintId::of(utils::internal_lints::lint_without_lint_pass::LINT_WITHOUT_LINT_PASS),
++ LintId::of(utils::internal_lints::lint_without_lint_pass::MISSING_CLIPPY_VERSION_ATTRIBUTE),
++ LintId::of(utils::internal_lints::msrv_attr_impl::MISSING_MSRV_ATTR_IMPL),
++ LintId::of(utils::internal_lints::outer_expn_data_pass::OUTER_EXPN_EXPN_DATA),
++ LintId::of(utils::internal_lints::produce_ice::PRODUCE_ICE),
++ LintId::of(utils::internal_lints::unnecessary_def_path::UNNECESSARY_DEF_PATH),
+])
--- /dev/null
- utils::internal_lints::CLIPPY_LINTS_INTERNAL,
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_lints(&[
+ #[cfg(feature = "internal")]
- utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS,
++ utils::internal_lints::clippy_lints_internal::CLIPPY_LINTS_INTERNAL,
+ #[cfg(feature = "internal")]
- utils::internal_lints::COMPILER_LINT_FUNCTIONS,
++ utils::internal_lints::collapsible_calls::COLLAPSIBLE_SPAN_LINT_CALLS,
+ #[cfg(feature = "internal")]
- utils::internal_lints::DEFAULT_DEPRECATION_REASON,
++ utils::internal_lints::compiler_lint_functions::COMPILER_LINT_FUNCTIONS,
+ #[cfg(feature = "internal")]
- utils::internal_lints::DEFAULT_LINT,
++ utils::internal_lints::if_chain_style::IF_CHAIN_STYLE,
+ #[cfg(feature = "internal")]
- utils::internal_lints::IF_CHAIN_STYLE,
++ utils::internal_lints::interning_defined_symbol::INTERNING_DEFINED_SYMBOL,
+ #[cfg(feature = "internal")]
- utils::internal_lints::INTERNING_DEFINED_SYMBOL,
++ utils::internal_lints::interning_defined_symbol::UNNECESSARY_SYMBOL_STR,
+ #[cfg(feature = "internal")]
- utils::internal_lints::INVALID_CLIPPY_VERSION_ATTRIBUTE,
++ utils::internal_lints::invalid_paths::INVALID_PATHS,
+ #[cfg(feature = "internal")]
- utils::internal_lints::INVALID_PATHS,
++ utils::internal_lints::lint_without_lint_pass::DEFAULT_DEPRECATION_REASON,
+ #[cfg(feature = "internal")]
- utils::internal_lints::LINT_WITHOUT_LINT_PASS,
++ utils::internal_lints::lint_without_lint_pass::DEFAULT_LINT,
+ #[cfg(feature = "internal")]
- utils::internal_lints::MISSING_CLIPPY_VERSION_ATTRIBUTE,
++ utils::internal_lints::lint_without_lint_pass::INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
- utils::internal_lints::MISSING_MSRV_ATTR_IMPL,
++ utils::internal_lints::lint_without_lint_pass::LINT_WITHOUT_LINT_PASS,
+ #[cfg(feature = "internal")]
- utils::internal_lints::OUTER_EXPN_EXPN_DATA,
++ utils::internal_lints::lint_without_lint_pass::MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
- utils::internal_lints::PRODUCE_ICE,
++ utils::internal_lints::msrv_attr_impl::MISSING_MSRV_ATTR_IMPL,
+ #[cfg(feature = "internal")]
- utils::internal_lints::UNNECESSARY_DEF_PATH,
++ utils::internal_lints::outer_expn_data_pass::OUTER_EXPN_EXPN_DATA,
+ #[cfg(feature = "internal")]
- utils::internal_lints::UNNECESSARY_SYMBOL_STR,
++ utils::internal_lints::produce_ice::PRODUCE_ICE,
+ #[cfg(feature = "internal")]
++ utils::internal_lints::unnecessary_def_path::UNNECESSARY_DEF_PATH,
+ almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE,
+ approx_const::APPROX_CONSTANT,
+ as_conversions::AS_CONVERSIONS,
+ asm_syntax::INLINE_ASM_X86_ATT_SYNTAX,
+ asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX,
+ assertions_on_constants::ASSERTIONS_ON_CONSTANTS,
+ assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES,
+ async_yields_async::ASYNC_YIELDS_ASYNC,
+ attrs::ALLOW_ATTRIBUTES_WITHOUT_REASON,
+ attrs::BLANKET_CLIPPY_RESTRICTION_LINTS,
+ attrs::DEPRECATED_CFG_ATTR,
+ attrs::DEPRECATED_SEMVER,
+ attrs::EMPTY_LINE_AFTER_OUTER_ATTR,
+ attrs::INLINE_ALWAYS,
+ attrs::MISMATCHED_TARGET_OS,
+ attrs::USELESS_ATTRIBUTE,
+ await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE,
+ await_holding_invalid::AWAIT_HOLDING_LOCK,
+ await_holding_invalid::AWAIT_HOLDING_REFCELL_REF,
+ blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS,
+ bool_assert_comparison::BOOL_ASSERT_COMPARISON,
+ bool_to_int_with_if::BOOL_TO_INT_WITH_IF,
+ booleans::NONMINIMAL_BOOL,
+ booleans::OVERLY_COMPLEX_BOOL_EXPR,
+ borrow_deref_ref::BORROW_DEREF_REF,
+ box_default::BOX_DEFAULT,
+ cargo::CARGO_COMMON_METADATA,
+ cargo::MULTIPLE_CRATE_VERSIONS,
+ cargo::NEGATIVE_FEATURE_NAMES,
+ cargo::REDUNDANT_FEATURE_NAMES,
+ cargo::WILDCARD_DEPENDENCIES,
++ casts::AS_PTR_CAST_MUT,
+ casts::AS_UNDERSCORE,
+ casts::BORROW_AS_PTR,
+ casts::CAST_ABS_TO_UNSIGNED,
+ casts::CAST_ENUM_CONSTRUCTOR,
+ casts::CAST_ENUM_TRUNCATION,
+ casts::CAST_LOSSLESS,
++ casts::CAST_NAN_TO_INT,
+ casts::CAST_POSSIBLE_TRUNCATION,
+ casts::CAST_POSSIBLE_WRAP,
+ casts::CAST_PRECISION_LOSS,
+ casts::CAST_PTR_ALIGNMENT,
+ casts::CAST_REF_TO_MUT,
+ casts::CAST_SIGN_LOSS,
+ casts::CAST_SLICE_DIFFERENT_SIZES,
+ casts::CAST_SLICE_FROM_RAW_PARTS,
+ casts::CHAR_LIT_AS_U8,
+ casts::FN_TO_NUMERIC_CAST,
+ casts::FN_TO_NUMERIC_CAST_ANY,
+ casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION,
+ casts::PTR_AS_PTR,
+ casts::UNNECESSARY_CAST,
+ checked_conversions::CHECKED_CONVERSIONS,
+ cognitive_complexity::COGNITIVE_COMPLEXITY,
+ collapsible_if::COLLAPSIBLE_ELSE_IF,
+ collapsible_if::COLLAPSIBLE_IF,
+ comparison_chain::COMPARISON_CHAIN,
+ copies::BRANCHES_SHARING_CODE,
+ copies::IFS_SAME_COND,
+ copies::IF_SAME_THEN_ELSE,
+ copies::SAME_FUNCTIONS_IN_IF_CONDITION,
+ copy_iterator::COPY_ITERATOR,
+ crate_in_macro_def::CRATE_IN_MACRO_DEF,
+ create_dir::CREATE_DIR,
+ dbg_macro::DBG_MACRO,
+ default::DEFAULT_TRAIT_ACCESS,
+ default::FIELD_REASSIGN_WITH_DEFAULT,
+ default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY,
+ default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK,
+ default_union_representation::DEFAULT_UNION_REPRESENTATION,
+ dereference::EXPLICIT_AUTO_DEREF,
+ dereference::EXPLICIT_DEREF_METHODS,
+ dereference::NEEDLESS_BORROW,
+ dereference::REF_BINDING_TO_REFERENCE,
+ derivable_impls::DERIVABLE_IMPLS,
+ derive::DERIVE_HASH_XOR_EQ,
+ derive::DERIVE_ORD_XOR_PARTIAL_ORD,
+ derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ,
+ derive::EXPL_IMPL_CLONE_ON_COPY,
+ derive::UNSAFE_DERIVE_DESERIALIZE,
+ disallowed_macros::DISALLOWED_MACROS,
+ disallowed_methods::DISALLOWED_METHODS,
+ disallowed_names::DISALLOWED_NAMES,
+ disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS,
+ disallowed_types::DISALLOWED_TYPES,
+ doc::DOC_LINK_WITH_QUOTES,
+ doc::DOC_MARKDOWN,
+ doc::MISSING_ERRORS_DOC,
+ doc::MISSING_PANICS_DOC,
+ doc::MISSING_SAFETY_DOC,
+ doc::NEEDLESS_DOCTEST_MAIN,
+ double_parens::DOUBLE_PARENS,
+ drop_forget_ref::DROP_COPY,
+ drop_forget_ref::DROP_NON_DROP,
+ drop_forget_ref::DROP_REF,
+ drop_forget_ref::FORGET_COPY,
+ drop_forget_ref::FORGET_NON_DROP,
+ drop_forget_ref::FORGET_REF,
+ drop_forget_ref::UNDROPPED_MANUALLY_DROPS,
+ duplicate_mod::DUPLICATE_MOD,
+ else_if_without_else::ELSE_IF_WITHOUT_ELSE,
+ empty_drop::EMPTY_DROP,
+ empty_enum::EMPTY_ENUM,
+ empty_structs_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS,
+ entry::MAP_ENTRY,
+ enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT,
+ enum_variants::ENUM_VARIANT_NAMES,
+ enum_variants::MODULE_INCEPTION,
+ enum_variants::MODULE_NAME_REPETITIONS,
+ equatable_if_let::EQUATABLE_IF_LET,
+ escape::BOXED_LOCAL,
+ eta_reduction::REDUNDANT_CLOSURE,
+ eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS,
+ excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS,
+ excessive_bools::STRUCT_EXCESSIVE_BOOLS,
+ exhaustive_items::EXHAUSTIVE_ENUMS,
+ exhaustive_items::EXHAUSTIVE_STRUCTS,
+ exit::EXIT,
+ explicit_write::EXPLICIT_WRITE,
+ fallible_impl_from::FALLIBLE_IMPL_FROM,
+ float_literal::EXCESSIVE_PRECISION,
+ float_literal::LOSSY_FLOAT_LITERAL,
+ floating_point_arithmetic::IMPRECISE_FLOPS,
+ floating_point_arithmetic::SUBOPTIMAL_FLOPS,
+ format::USELESS_FORMAT,
+ format_args::FORMAT_IN_FORMAT_ARGS,
+ format_args::TO_STRING_IN_FORMAT_ARGS,
+ format_args::UNINLINED_FORMAT_ARGS,
++ format_args::UNUSED_FORMAT_SPECS,
+ format_impl::PRINT_IN_FORMAT_IMPL,
+ format_impl::RECURSIVE_FORMAT_IMPL,
+ format_push_string::FORMAT_PUSH_STRING,
+ formatting::POSSIBLE_MISSING_COMMA,
+ formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ formatting::SUSPICIOUS_ELSE_FORMATTING,
+ formatting::SUSPICIOUS_UNARY_OP_FORMATTING,
+ from_over_into::FROM_OVER_INTO,
+ from_str_radix_10::FROM_STR_RADIX_10,
+ functions::DOUBLE_MUST_USE,
+ functions::MUST_USE_CANDIDATE,
+ functions::MUST_USE_UNIT,
+ functions::NOT_UNSAFE_PTR_ARG_DEREF,
+ functions::RESULT_LARGE_ERR,
+ functions::RESULT_UNIT_ERR,
+ functions::TOO_MANY_ARGUMENTS,
+ functions::TOO_MANY_LINES,
+ future_not_send::FUTURE_NOT_SEND,
+ if_let_mutex::IF_LET_MUTEX,
+ if_not_else::IF_NOT_ELSE,
+ if_then_some_else_none::IF_THEN_SOME_ELSE_NONE,
+ implicit_hasher::IMPLICIT_HASHER,
+ implicit_return::IMPLICIT_RETURN,
+ implicit_saturating_add::IMPLICIT_SATURATING_ADD,
+ implicit_saturating_sub::IMPLICIT_SATURATING_SUB,
+ inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR,
+ index_refutable_slice::INDEX_REFUTABLE_SLICE,
+ indexing_slicing::INDEXING_SLICING,
+ indexing_slicing::OUT_OF_BOUNDS_INDEXING,
+ infinite_iter::INFINITE_ITER,
+ infinite_iter::MAYBE_INFINITE_ITER,
+ inherent_impl::MULTIPLE_INHERENT_IMPL,
+ inherent_to_string::INHERENT_TO_STRING,
+ inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY,
+ init_numbered_fields::INIT_NUMBERED_FIELDS,
+ inline_fn_without_body::INLINE_FN_WITHOUT_BODY,
+ int_plus_one::INT_PLUS_ONE,
+ invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS,
+ invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED,
+ items_after_statements::ITEMS_AFTER_STATEMENTS,
+ iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR,
+ large_const_arrays::LARGE_CONST_ARRAYS,
+ large_enum_variant::LARGE_ENUM_VARIANT,
+ large_include_file::LARGE_INCLUDE_FILE,
+ large_stack_arrays::LARGE_STACK_ARRAYS,
+ len_zero::COMPARISON_TO_EMPTY,
+ len_zero::LEN_WITHOUT_IS_EMPTY,
+ len_zero::LEN_ZERO,
+ let_if_seq::USELESS_LET_IF_SEQ,
+ let_underscore::LET_UNDERSCORE_DROP,
+ let_underscore::LET_UNDERSCORE_LOCK,
+ let_underscore::LET_UNDERSCORE_MUST_USE,
+ lifetimes::EXTRA_UNUSED_LIFETIMES,
+ lifetimes::NEEDLESS_LIFETIMES,
+ literal_representation::DECIMAL_LITERAL_REPRESENTATION,
+ literal_representation::INCONSISTENT_DIGIT_GROUPING,
+ literal_representation::LARGE_DIGIT_GROUPS,
+ literal_representation::MISTYPED_LITERAL_SUFFIXES,
+ literal_representation::UNREADABLE_LITERAL,
+ literal_representation::UNUSUAL_BYTE_GROUPINGS,
+ loops::EMPTY_LOOP,
+ loops::EXPLICIT_COUNTER_LOOP,
+ loops::EXPLICIT_INTO_ITER_LOOP,
+ loops::EXPLICIT_ITER_LOOP,
+ loops::FOR_KV_MAP,
+ loops::ITER_NEXT_LOOP,
+ loops::MANUAL_FIND,
+ loops::MANUAL_FLATTEN,
+ loops::MANUAL_MEMCPY,
+ loops::MISSING_SPIN_LOOP,
+ loops::MUT_RANGE_BOUND,
+ loops::NEEDLESS_COLLECT,
+ loops::NEEDLESS_RANGE_LOOP,
+ loops::NEVER_LOOP,
+ loops::SAME_ITEM_PUSH,
+ loops::SINGLE_ELEMENT_LOOP,
+ loops::WHILE_IMMUTABLE_CONDITION,
+ loops::WHILE_LET_LOOP,
+ loops::WHILE_LET_ON_ITERATOR,
+ macro_use::MACRO_USE_IMPORTS,
+ main_recursion::MAIN_RECURSION,
+ manual_assert::MANUAL_ASSERT,
+ manual_async_fn::MANUAL_ASYNC_FN,
+ manual_bits::MANUAL_BITS,
+ manual_clamp::MANUAL_CLAMP,
+ manual_instant_elapsed::MANUAL_INSTANT_ELAPSED,
+ manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE,
+ manual_rem_euclid::MANUAL_REM_EUCLID,
+ manual_retain::MANUAL_RETAIN,
+ manual_string_new::MANUAL_STRING_NEW,
+ manual_strip::MANUAL_STRIP,
+ map_unit_fn::OPTION_MAP_UNIT_FN,
+ map_unit_fn::RESULT_MAP_UNIT_FN,
+ match_result_ok::MATCH_RESULT_OK,
+ matches::COLLAPSIBLE_MATCH,
+ matches::INFALLIBLE_DESTRUCTURING_MATCH,
++ matches::MANUAL_FILTER,
+ matches::MANUAL_MAP,
+ matches::MANUAL_UNWRAP_OR,
+ matches::MATCH_AS_REF,
+ matches::MATCH_BOOL,
+ matches::MATCH_LIKE_MATCHES_MACRO,
+ matches::MATCH_ON_VEC_ITEMS,
+ matches::MATCH_OVERLAPPING_ARM,
+ matches::MATCH_REF_PATS,
+ matches::MATCH_SAME_ARMS,
+ matches::MATCH_SINGLE_BINDING,
+ matches::MATCH_STR_CASE_MISMATCH,
+ matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ matches::MATCH_WILD_ERR_ARM,
+ matches::NEEDLESS_MATCH,
+ matches::REDUNDANT_PATTERN_MATCHING,
+ matches::REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ matches::SIGNIFICANT_DROP_IN_SCRUTINEE,
+ matches::SINGLE_MATCH,
+ matches::SINGLE_MATCH_ELSE,
+ matches::TRY_ERR,
+ matches::WILDCARD_ENUM_MATCH_ARM,
+ matches::WILDCARD_IN_OR_PATTERNS,
+ mem_forget::MEM_FORGET,
+ mem_replace::MEM_REPLACE_OPTION_WITH_NONE,
+ mem_replace::MEM_REPLACE_WITH_DEFAULT,
+ mem_replace::MEM_REPLACE_WITH_UNINIT,
+ methods::BIND_INSTEAD_OF_MAP,
+ methods::BYTES_COUNT_TO_LEN,
+ methods::BYTES_NTH,
+ methods::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ methods::CHARS_LAST_CMP,
+ methods::CHARS_NEXT_CMP,
+ methods::CLONED_INSTEAD_OF_COPIED,
+ methods::CLONE_DOUBLE_REF,
+ methods::CLONE_ON_COPY,
+ methods::CLONE_ON_REF_PTR,
+ methods::COLLAPSIBLE_STR_REPLACE,
+ methods::ERR_EXPECT,
+ methods::EXPECT_FUN_CALL,
+ methods::EXPECT_USED,
+ methods::EXTEND_WITH_DRAIN,
+ methods::FILETYPE_IS_FILE,
+ methods::FILTER_MAP_IDENTITY,
+ methods::FILTER_MAP_NEXT,
+ methods::FILTER_NEXT,
+ methods::FLAT_MAP_IDENTITY,
+ methods::FLAT_MAP_OPTION,
+ methods::FROM_ITER_INSTEAD_OF_COLLECT,
+ methods::GET_FIRST,
+ methods::GET_LAST_WITH_LEN,
+ methods::GET_UNWRAP,
+ methods::IMPLICIT_CLONE,
+ methods::INEFFICIENT_TO_STRING,
+ methods::INSPECT_FOR_EACH,
+ methods::INTO_ITER_ON_REF,
+ methods::IS_DIGIT_ASCII_RADIX,
+ methods::ITERATOR_STEP_BY_ZERO,
+ methods::ITER_CLONED_COLLECT,
+ methods::ITER_COUNT,
+ methods::ITER_KV_MAP,
+ methods::ITER_NEXT_SLICE,
+ methods::ITER_NTH,
+ methods::ITER_NTH_ZERO,
+ methods::ITER_ON_EMPTY_COLLECTIONS,
+ methods::ITER_ON_SINGLE_ITEMS,
+ methods::ITER_OVEREAGER_CLONED,
+ methods::ITER_SKIP_NEXT,
+ methods::ITER_WITH_DRAIN,
+ methods::MANUAL_FILTER_MAP,
+ methods::MANUAL_FIND_MAP,
+ methods::MANUAL_OK_OR,
+ methods::MANUAL_SATURATING_ARITHMETIC,
+ methods::MANUAL_SPLIT_ONCE,
+ methods::MANUAL_STR_REPEAT,
+ methods::MAP_CLONE,
+ methods::MAP_COLLECT_RESULT_UNIT,
+ methods::MAP_ERR_IGNORE,
+ methods::MAP_FLATTEN,
+ methods::MAP_IDENTITY,
+ methods::MAP_UNWRAP_OR,
+ methods::MUT_MUTEX_LOCK,
+ methods::NAIVE_BYTECOUNT,
+ methods::NEEDLESS_OPTION_AS_DEREF,
+ methods::NEEDLESS_OPTION_TAKE,
+ methods::NEEDLESS_SPLITN,
+ methods::NEW_RET_NO_SELF,
+ methods::NONSENSICAL_OPEN_OPTIONS,
+ methods::NO_EFFECT_REPLACE,
+ methods::OBFUSCATED_IF_ELSE,
+ methods::OK_EXPECT,
+ methods::OPTION_AS_REF_DEREF,
+ methods::OPTION_FILTER_MAP,
+ methods::OPTION_MAP_OR_NONE,
+ methods::OR_FUN_CALL,
+ methods::OR_THEN_UNWRAP,
+ methods::PATH_BUF_PUSH_OVERWRITE,
+ methods::RANGE_ZIP_WITH_LEN,
+ methods::REPEAT_ONCE,
+ methods::RESULT_MAP_OR_INTO_OPTION,
+ methods::SEARCH_IS_SOME,
+ methods::SHOULD_IMPLEMENT_TRAIT,
+ methods::SINGLE_CHAR_ADD_STR,
+ methods::SINGLE_CHAR_PATTERN,
+ methods::SKIP_WHILE_NEXT,
+ methods::STABLE_SORT_PRIMITIVE,
+ methods::STRING_EXTEND_CHARS,
+ methods::SUSPICIOUS_MAP,
+ methods::SUSPICIOUS_SPLITN,
+ methods::SUSPICIOUS_TO_OWNED,
+ methods::UNINIT_ASSUMED_INIT,
+ methods::UNIT_HASH,
+ methods::UNNECESSARY_FILTER_MAP,
+ methods::UNNECESSARY_FIND_MAP,
+ methods::UNNECESSARY_FOLD,
+ methods::UNNECESSARY_JOIN,
+ methods::UNNECESSARY_LAZY_EVALUATIONS,
+ methods::UNNECESSARY_SORT_BY,
+ methods::UNNECESSARY_TO_OWNED,
+ methods::UNWRAP_OR_ELSE_DEFAULT,
+ methods::UNWRAP_USED,
+ methods::USELESS_ASREF,
+ methods::VEC_RESIZE_TO_ZERO,
+ methods::VERBOSE_FILE_READS,
+ methods::WRONG_SELF_CONVENTION,
+ methods::ZST_OFFSET,
+ minmax::MIN_MAX,
+ misc::SHORT_CIRCUIT_STATEMENT,
+ misc::TOPLEVEL_REF_ARG,
+ misc::USED_UNDERSCORE_BINDING,
+ misc::ZERO_PTR,
+ misc_early::BUILTIN_TYPE_SHADOW,
+ misc_early::DOUBLE_NEG,
+ misc_early::DUPLICATE_UNDERSCORE_ARGUMENT,
+ misc_early::MIXED_CASE_HEX_LITERALS,
+ misc_early::REDUNDANT_PATTERN,
+ misc_early::SEPARATED_LITERAL_SUFFIX,
+ misc_early::UNNEEDED_FIELD_PATTERN,
+ misc_early::UNNEEDED_WILDCARD_PATTERN,
+ misc_early::UNSEPARATED_LITERAL_SUFFIX,
+ misc_early::ZERO_PREFIXED_LITERAL,
+ mismatching_type_param_order::MISMATCHING_TYPE_PARAM_ORDER,
+ missing_const_for_fn::MISSING_CONST_FOR_FN,
+ missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS,
+ missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES,
+ missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS,
++ missing_trait_methods::MISSING_TRAIT_METHODS,
+ mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION,
+ mixed_read_write_in_expression::MIXED_READ_WRITE_IN_EXPRESSION,
+ module_style::MOD_MODULE_FILES,
+ module_style::SELF_NAMED_MODULE_FILES,
+ multi_assignments::MULTI_ASSIGNMENTS,
+ mut_key::MUTABLE_KEY_TYPE,
+ mut_mut::MUT_MUT,
+ mut_reference::UNNECESSARY_MUT_PASSED,
+ mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL,
+ mutex_atomic::MUTEX_ATOMIC,
+ mutex_atomic::MUTEX_INTEGER,
+ needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE,
+ needless_bool::BOOL_COMPARISON,
+ needless_bool::NEEDLESS_BOOL,
+ needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE,
+ needless_continue::NEEDLESS_CONTINUE,
+ needless_for_each::NEEDLESS_FOR_EACH,
+ needless_late_init::NEEDLESS_LATE_INIT,
+ needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS,
+ needless_pass_by_value::NEEDLESS_PASS_BY_VALUE,
+ needless_question_mark::NEEDLESS_QUESTION_MARK,
+ needless_update::NEEDLESS_UPDATE,
+ neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD,
+ neg_multiply::NEG_MULTIPLY,
+ new_without_default::NEW_WITHOUT_DEFAULT,
+ no_effect::NO_EFFECT,
+ no_effect::NO_EFFECT_UNDERSCORE_BINDING,
+ no_effect::UNNECESSARY_OPERATION,
+ non_copy_const::BORROW_INTERIOR_MUTABLE_CONST,
+ non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST,
+ non_expressive_names::JUST_UNDERSCORES_AND_DIGITS,
+ non_expressive_names::MANY_SINGLE_CHAR_NAMES,
+ non_expressive_names::SIMILAR_NAMES,
+ non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS,
+ non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY,
+ nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES,
+ octal_escapes::OCTAL_ESCAPES,
+ only_used_in_recursion::ONLY_USED_IN_RECURSION,
+ operators::ABSURD_EXTREME_COMPARISONS,
+ operators::ARITHMETIC_SIDE_EFFECTS,
+ operators::ASSIGN_OP_PATTERN,
+ operators::BAD_BIT_MASK,
+ operators::CMP_NAN,
+ operators::CMP_OWNED,
+ operators::DOUBLE_COMPARISONS,
+ operators::DURATION_SUBSEC,
+ operators::EQ_OP,
+ operators::ERASING_OP,
+ operators::FLOAT_ARITHMETIC,
+ operators::FLOAT_CMP,
+ operators::FLOAT_CMP_CONST,
+ operators::FLOAT_EQUALITY_WITHOUT_ABS,
+ operators::IDENTITY_OP,
+ operators::INEFFECTIVE_BIT_MASK,
+ operators::INTEGER_ARITHMETIC,
+ operators::INTEGER_DIVISION,
+ operators::MISREFACTORED_ASSIGN_OP,
+ operators::MODULO_ARITHMETIC,
+ operators::MODULO_ONE,
+ operators::NEEDLESS_BITWISE_BOOL,
+ operators::OP_REF,
+ operators::PTR_EQ,
+ operators::SELF_ASSIGNMENT,
+ operators::VERBOSE_BIT_MASK,
+ option_env_unwrap::OPTION_ENV_UNWRAP,
+ option_if_let_else::OPTION_IF_LET_ELSE,
+ overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL,
+ panic_in_result_fn::PANIC_IN_RESULT_FN,
+ panic_unimplemented::PANIC,
+ panic_unimplemented::TODO,
+ panic_unimplemented::UNIMPLEMENTED,
+ panic_unimplemented::UNREACHABLE,
++ partial_pub_fields::PARTIAL_PUB_FIELDS,
+ partialeq_ne_impl::PARTIALEQ_NE_IMPL,
+ partialeq_to_none::PARTIALEQ_TO_NONE,
+ pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE,
+ pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF,
+ pattern_type_mismatch::PATTERN_TYPE_MISMATCH,
+ precedence::PRECEDENCE,
+ ptr::CMP_NULL,
+ ptr::INVALID_NULL_PTR_USAGE,
+ ptr::MUT_FROM_REF,
+ ptr::PTR_ARG,
+ ptr_offset_with_cast::PTR_OFFSET_WITH_CAST,
+ pub_use::PUB_USE,
+ question_mark::QUESTION_MARK,
+ ranges::MANUAL_RANGE_CONTAINS,
+ ranges::RANGE_MINUS_ONE,
+ ranges::RANGE_PLUS_ONE,
+ ranges::REVERSED_EMPTY_RANGES,
+ rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT,
+ read_zero_byte_vec::READ_ZERO_BYTE_VEC,
+ redundant_clone::REDUNDANT_CLONE,
+ redundant_closure_call::REDUNDANT_CLOSURE_CALL,
+ redundant_else::REDUNDANT_ELSE,
+ redundant_field_names::REDUNDANT_FIELD_NAMES,
+ redundant_pub_crate::REDUNDANT_PUB_CRATE,
+ redundant_slicing::DEREF_BY_SLICING,
+ redundant_slicing::REDUNDANT_SLICING,
+ redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
+ ref_option_ref::REF_OPTION_REF,
+ reference::DEREF_ADDROF,
+ regex::INVALID_REGEX,
+ regex::TRIVIAL_REGEX,
+ return_self_not_must_use::RETURN_SELF_NOT_MUST_USE,
+ returns::LET_AND_RETURN,
+ returns::NEEDLESS_RETURN,
+ same_name_method::SAME_NAME_METHOD,
+ self_named_constructors::SELF_NAMED_CONSTRUCTORS,
+ semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED,
+ serde_api::SERDE_API_MISUSE,
+ shadow::SHADOW_REUSE,
+ shadow::SHADOW_SAME,
+ shadow::SHADOW_UNRELATED,
+ single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES,
+ single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS,
+ size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT,
+ slow_vector_initialization::SLOW_VECTOR_INITIALIZATION,
+ std_instead_of_core::ALLOC_INSTEAD_OF_CORE,
+ std_instead_of_core::STD_INSTEAD_OF_ALLOC,
+ std_instead_of_core::STD_INSTEAD_OF_CORE,
+ strings::STRING_ADD,
+ strings::STRING_ADD_ASSIGN,
+ strings::STRING_FROM_UTF8_AS_BYTES,
+ strings::STRING_LIT_AS_BYTES,
+ strings::STRING_SLICE,
+ strings::STRING_TO_STRING,
+ strings::STR_TO_STRING,
+ strings::TRIM_SPLIT_WHITESPACE,
+ strlen_on_c_strings::STRLEN_ON_C_STRINGS,
+ suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS,
+ suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL,
+ suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL,
+ swap::ALMOST_SWAPPED,
+ swap::MANUAL_SWAP,
+ swap_ptr_to_ref::SWAP_PTR_TO_REF,
+ tabs_in_doc_comments::TABS_IN_DOC_COMMENTS,
+ temporary_assignment::TEMPORARY_ASSIGNMENT,
+ to_digit_is_some::TO_DIGIT_IS_SOME,
+ trailing_empty_array::TRAILING_EMPTY_ARRAY,
+ trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS,
+ trait_bounds::TYPE_REPETITION_IN_BOUNDS,
+ transmute::CROSSPOINTER_TRANSMUTE,
+ transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
+ transmute::TRANSMUTE_BYTES_TO_STR,
+ transmute::TRANSMUTE_FLOAT_TO_INT,
+ transmute::TRANSMUTE_INT_TO_BOOL,
+ transmute::TRANSMUTE_INT_TO_CHAR,
+ transmute::TRANSMUTE_INT_TO_FLOAT,
+ transmute::TRANSMUTE_NUM_TO_BYTES,
+ transmute::TRANSMUTE_PTR_TO_PTR,
+ transmute::TRANSMUTE_PTR_TO_REF,
+ transmute::TRANSMUTE_UNDEFINED_REPR,
+ transmute::TRANSMUTING_NULL,
+ transmute::UNSOUND_COLLECTION_TRANSMUTE,
+ transmute::USELESS_TRANSMUTE,
+ transmute::WRONG_TRANSMUTE,
+ types::BORROWED_BOX,
+ types::BOX_COLLECTION,
+ types::LINKEDLIST,
+ types::OPTION_OPTION,
+ types::RC_BUFFER,
+ types::RC_MUTEX,
+ types::REDUNDANT_ALLOCATION,
+ types::TYPE_COMPLEXITY,
+ types::VEC_BOX,
+ undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS,
+ unicode::INVISIBLE_CHARACTERS,
+ unicode::NON_ASCII_LITERAL,
+ unicode::UNICODE_NOT_NFC,
+ uninit_vec::UNINIT_VEC,
+ unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD,
+ unit_types::LET_UNIT_VALUE,
+ unit_types::UNIT_ARG,
+ unit_types::UNIT_CMP,
+ unnamed_address::FN_ADDRESS_COMPARISONS,
+ unnamed_address::VTABLE_ADDRESS_COMPARISONS,
+ unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS,
+ unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS,
+ unnecessary_wraps::UNNECESSARY_WRAPS,
+ unnested_or_patterns::UNNESTED_OR_PATTERNS,
+ unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME,
+ unused_async::UNUSED_ASYNC,
+ unused_io_amount::UNUSED_IO_AMOUNT,
+ unused_peekable::UNUSED_PEEKABLE,
+ unused_rounding::UNUSED_ROUNDING,
+ unused_self::UNUSED_SELF,
+ unused_unit::UNUSED_UNIT,
+ unwrap::PANICKING_UNWRAP,
+ unwrap::UNNECESSARY_UNWRAP,
+ unwrap_in_result::UNWRAP_IN_RESULT,
+ upper_case_acronyms::UPPER_CASE_ACRONYMS,
+ use_self::USE_SELF,
+ useless_conversion::USELESS_CONVERSION,
+ vec::USELESS_VEC,
+ vec_init_then_push::VEC_INIT_THEN_PUSH,
+ wildcard_imports::ENUM_GLOB_USE,
+ wildcard_imports::WILDCARD_IMPORTS,
+ write::PRINTLN_EMPTY_STRING,
+ write::PRINT_LITERAL,
+ write::PRINT_STDERR,
+ write::PRINT_STDOUT,
+ write::PRINT_WITH_NEWLINE,
+ write::USE_DEBUG,
+ write::WRITELN_EMPTY_STRING,
+ write::WRITE_LITERAL,
+ write::WRITE_WITH_NEWLINE,
+ zero_div_zero::ZERO_DIVIDED_BY_ZERO,
+ zero_sized_map_values::ZERO_SIZED_MAP_VALUES,
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::nursery", Some("clippy_nursery"), vec![
+ LintId::of(attrs::EMPTY_LINE_AFTER_OUTER_ATTR),
++ LintId::of(casts::AS_PTR_CAST_MUT),
+ LintId::of(cognitive_complexity::COGNITIVE_COMPLEXITY),
+ LintId::of(copies::BRANCHES_SHARING_CODE),
+ LintId::of(derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ),
+ LintId::of(equatable_if_let::EQUATABLE_IF_LET),
+ LintId::of(fallible_impl_from::FALLIBLE_IMPL_FROM),
+ LintId::of(floating_point_arithmetic::IMPRECISE_FLOPS),
+ LintId::of(floating_point_arithmetic::SUBOPTIMAL_FLOPS),
+ LintId::of(future_not_send::FUTURE_NOT_SEND),
+ LintId::of(index_refutable_slice::INDEX_REFUTABLE_SLICE),
+ LintId::of(let_if_seq::USELESS_LET_IF_SEQ),
+ LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
+ LintId::of(methods::ITER_ON_EMPTY_COLLECTIONS),
+ LintId::of(methods::ITER_ON_SINGLE_ITEMS),
+ LintId::of(methods::ITER_WITH_DRAIN),
+ LintId::of(methods::PATH_BUF_PUSH_OVERWRITE),
+ LintId::of(missing_const_for_fn::MISSING_CONST_FOR_FN),
+ LintId::of(mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL),
+ LintId::of(mutex_atomic::MUTEX_ATOMIC),
+ LintId::of(mutex_atomic::MUTEX_INTEGER),
+ LintId::of(non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY),
+ LintId::of(nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES),
+ LintId::of(option_if_let_else::OPTION_IF_LET_ELSE),
+ LintId::of(redundant_pub_crate::REDUNDANT_PUB_CRATE),
+ LintId::of(regex::TRIVIAL_REGEX),
+ LintId::of(strings::STRING_LIT_AS_BYTES),
+ LintId::of(suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS),
+ LintId::of(trailing_empty_array::TRAILING_EMPTY_ARRAY),
+ LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
+ LintId::of(unused_peekable::UNUSED_PEEKABLE),
+ LintId::of(unused_rounding::UNUSED_ROUNDING),
+ LintId::of(use_self::USE_SELF),
+])
--- /dev/null
- LintId::of(format_args::UNINLINED_FORMAT_ARGS),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
+ LintId::of(attrs::INLINE_ALWAYS),
+ LintId::of(casts::BORROW_AS_PTR),
+ LintId::of(casts::CAST_LOSSLESS),
+ LintId::of(casts::CAST_POSSIBLE_TRUNCATION),
+ LintId::of(casts::CAST_POSSIBLE_WRAP),
+ LintId::of(casts::CAST_PRECISION_LOSS),
+ LintId::of(casts::CAST_PTR_ALIGNMENT),
+ LintId::of(casts::CAST_SIGN_LOSS),
+ LintId::of(casts::PTR_AS_PTR),
+ LintId::of(checked_conversions::CHECKED_CONVERSIONS),
+ LintId::of(copies::SAME_FUNCTIONS_IN_IF_CONDITION),
+ LintId::of(copy_iterator::COPY_ITERATOR),
+ LintId::of(default::DEFAULT_TRAIT_ACCESS),
+ LintId::of(dereference::EXPLICIT_DEREF_METHODS),
+ LintId::of(dereference::REF_BINDING_TO_REFERENCE),
+ LintId::of(derive::EXPL_IMPL_CLONE_ON_COPY),
+ LintId::of(derive::UNSAFE_DERIVE_DESERIALIZE),
+ LintId::of(doc::DOC_LINK_WITH_QUOTES),
+ LintId::of(doc::DOC_MARKDOWN),
+ LintId::of(doc::MISSING_ERRORS_DOC),
+ LintId::of(doc::MISSING_PANICS_DOC),
+ LintId::of(empty_enum::EMPTY_ENUM),
+ LintId::of(enum_variants::MODULE_NAME_REPETITIONS),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS),
+ LintId::of(excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS),
+ LintId::of(excessive_bools::STRUCT_EXCESSIVE_BOOLS),
- LintId::of(implicit_saturating_sub::IMPLICIT_SATURATING_SUB),
+ LintId::of(functions::MUST_USE_CANDIDATE),
+ LintId::of(functions::TOO_MANY_LINES),
+ LintId::of(if_not_else::IF_NOT_ELSE),
+ LintId::of(implicit_hasher::IMPLICIT_HASHER),
+ LintId::of(inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR),
+ LintId::of(infinite_iter::MAYBE_INFINITE_ITER),
+ LintId::of(invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS),
+ LintId::of(items_after_statements::ITEMS_AFTER_STATEMENTS),
+ LintId::of(iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR),
+ LintId::of(large_stack_arrays::LARGE_STACK_ARRAYS),
+ LintId::of(let_underscore::LET_UNDERSCORE_DROP),
+ LintId::of(literal_representation::LARGE_DIGIT_GROUPS),
+ LintId::of(literal_representation::UNREADABLE_LITERAL),
+ LintId::of(loops::EXPLICIT_INTO_ITER_LOOP),
+ LintId::of(loops::EXPLICIT_ITER_LOOP),
+ LintId::of(macro_use::MACRO_USE_IMPORTS),
+ LintId::of(manual_assert::MANUAL_ASSERT),
+ LintId::of(manual_instant_elapsed::MANUAL_INSTANT_ELAPSED),
+ LintId::of(manual_string_new::MANUAL_STRING_NEW),
+ LintId::of(matches::MATCH_BOOL),
+ LintId::of(matches::MATCH_ON_VEC_ITEMS),
+ LintId::of(matches::MATCH_SAME_ARMS),
+ LintId::of(matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS),
+ LintId::of(matches::MATCH_WILD_ERR_ARM),
+ LintId::of(matches::SINGLE_MATCH_ELSE),
+ LintId::of(methods::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS),
+ LintId::of(methods::CLONED_INSTEAD_OF_COPIED),
+ LintId::of(methods::FILTER_MAP_NEXT),
+ LintId::of(methods::FLAT_MAP_OPTION),
+ LintId::of(methods::FROM_ITER_INSTEAD_OF_COLLECT),
+ LintId::of(methods::IMPLICIT_CLONE),
+ LintId::of(methods::INEFFICIENT_TO_STRING),
+ LintId::of(methods::MANUAL_OK_OR),
+ LintId::of(methods::MAP_UNWRAP_OR),
+ LintId::of(methods::NAIVE_BYTECOUNT),
+ LintId::of(methods::STABLE_SORT_PRIMITIVE),
+ LintId::of(methods::UNNECESSARY_JOIN),
+ LintId::of(misc::USED_UNDERSCORE_BINDING),
+ LintId::of(mismatching_type_param_order::MISMATCHING_TYPE_PARAM_ORDER),
+ LintId::of(mut_mut::MUT_MUT),
+ LintId::of(needless_continue::NEEDLESS_CONTINUE),
+ LintId::of(needless_for_each::NEEDLESS_FOR_EACH),
+ LintId::of(needless_pass_by_value::NEEDLESS_PASS_BY_VALUE),
+ LintId::of(no_effect::NO_EFFECT_UNDERSCORE_BINDING),
+ LintId::of(non_expressive_names::MANY_SINGLE_CHAR_NAMES),
+ LintId::of(non_expressive_names::SIMILAR_NAMES),
+ LintId::of(operators::FLOAT_CMP),
+ LintId::of(operators::NEEDLESS_BITWISE_BOOL),
+ LintId::of(operators::VERBOSE_BIT_MASK),
+ LintId::of(pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE),
+ LintId::of(pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF),
+ LintId::of(ranges::RANGE_MINUS_ONE),
+ LintId::of(ranges::RANGE_PLUS_ONE),
+ LintId::of(redundant_else::REDUNDANT_ELSE),
+ LintId::of(ref_option_ref::REF_OPTION_REF),
+ LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
+ LintId::of(semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED),
+ LintId::of(strings::STRING_ADD_ASSIGN),
+ LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),
+ LintId::of(trait_bounds::TYPE_REPETITION_IN_BOUNDS),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_PTR),
+ LintId::of(types::LINKEDLIST),
+ LintId::of(types::OPTION_OPTION),
+ LintId::of(unicode::UNICODE_NOT_NFC),
+ LintId::of(unnecessary_wraps::UNNECESSARY_WRAPS),
+ LintId::of(unnested_or_patterns::UNNESTED_OR_PATTERNS),
+ LintId::of(unused_async::UNUSED_ASYNC),
+ LintId::of(unused_self::UNUSED_SELF),
+ LintId::of(wildcard_imports::ENUM_GLOB_USE),
+ LintId::of(wildcard_imports::WILDCARD_IMPORTS),
+ LintId::of(zero_sized_map_values::ZERO_SIZED_MAP_VALUES),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
+ LintId::of(as_conversions::AS_CONVERSIONS),
+ LintId::of(asm_syntax::INLINE_ASM_X86_ATT_SYNTAX),
+ LintId::of(asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX),
+ LintId::of(assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES),
+ LintId::of(attrs::ALLOW_ATTRIBUTES_WITHOUT_REASON),
+ LintId::of(casts::AS_UNDERSCORE),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_ANY),
+ LintId::of(create_dir::CREATE_DIR),
+ LintId::of(dbg_macro::DBG_MACRO),
+ LintId::of(default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK),
+ LintId::of(default_union_representation::DEFAULT_UNION_REPRESENTATION),
+ LintId::of(disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS),
+ LintId::of(else_if_without_else::ELSE_IF_WITHOUT_ELSE),
+ LintId::of(empty_drop::EMPTY_DROP),
+ LintId::of(empty_structs_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS),
+ LintId::of(exhaustive_items::EXHAUSTIVE_ENUMS),
+ LintId::of(exhaustive_items::EXHAUSTIVE_STRUCTS),
+ LintId::of(exit::EXIT),
+ LintId::of(float_literal::LOSSY_FLOAT_LITERAL),
+ LintId::of(format_push_string::FORMAT_PUSH_STRING),
+ LintId::of(if_then_some_else_none::IF_THEN_SOME_ELSE_NONE),
+ LintId::of(implicit_return::IMPLICIT_RETURN),
+ LintId::of(indexing_slicing::INDEXING_SLICING),
+ LintId::of(inherent_impl::MULTIPLE_INHERENT_IMPL),
+ LintId::of(large_include_file::LARGE_INCLUDE_FILE),
+ LintId::of(let_underscore::LET_UNDERSCORE_MUST_USE),
+ LintId::of(literal_representation::DECIMAL_LITERAL_REPRESENTATION),
+ LintId::of(matches::REST_PAT_IN_FULLY_BOUND_STRUCTS),
+ LintId::of(matches::TRY_ERR),
+ LintId::of(matches::WILDCARD_ENUM_MATCH_ARM),
+ LintId::of(mem_forget::MEM_FORGET),
+ LintId::of(methods::CLONE_ON_REF_PTR),
+ LintId::of(methods::EXPECT_USED),
+ LintId::of(methods::FILETYPE_IS_FILE),
+ LintId::of(methods::GET_UNWRAP),
+ LintId::of(methods::MAP_ERR_IGNORE),
+ LintId::of(methods::UNWRAP_USED),
+ LintId::of(methods::VERBOSE_FILE_READS),
+ LintId::of(misc_early::SEPARATED_LITERAL_SUFFIX),
+ LintId::of(misc_early::UNNEEDED_FIELD_PATTERN),
+ LintId::of(misc_early::UNSEPARATED_LITERAL_SUFFIX),
+ LintId::of(missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS),
+ LintId::of(missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES),
+ LintId::of(missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS),
++ LintId::of(missing_trait_methods::MISSING_TRAIT_METHODS),
+ LintId::of(mixed_read_write_in_expression::MIXED_READ_WRITE_IN_EXPRESSION),
+ LintId::of(module_style::MOD_MODULE_FILES),
+ LintId::of(module_style::SELF_NAMED_MODULE_FILES),
+ LintId::of(operators::ARITHMETIC_SIDE_EFFECTS),
+ LintId::of(operators::FLOAT_ARITHMETIC),
+ LintId::of(operators::FLOAT_CMP_CONST),
+ LintId::of(operators::INTEGER_ARITHMETIC),
+ LintId::of(operators::INTEGER_DIVISION),
+ LintId::of(operators::MODULO_ARITHMETIC),
+ LintId::of(panic_in_result_fn::PANIC_IN_RESULT_FN),
+ LintId::of(panic_unimplemented::PANIC),
+ LintId::of(panic_unimplemented::TODO),
+ LintId::of(panic_unimplemented::UNIMPLEMENTED),
+ LintId::of(panic_unimplemented::UNREACHABLE),
++ LintId::of(partial_pub_fields::PARTIAL_PUB_FIELDS),
+ LintId::of(pattern_type_mismatch::PATTERN_TYPE_MISMATCH),
+ LintId::of(pub_use::PUB_USE),
+ LintId::of(redundant_slicing::DEREF_BY_SLICING),
+ LintId::of(same_name_method::SAME_NAME_METHOD),
+ LintId::of(shadow::SHADOW_REUSE),
+ LintId::of(shadow::SHADOW_SAME),
+ LintId::of(shadow::SHADOW_UNRELATED),
+ LintId::of(single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES),
+ LintId::of(std_instead_of_core::ALLOC_INSTEAD_OF_CORE),
+ LintId::of(std_instead_of_core::STD_INSTEAD_OF_ALLOC),
+ LintId::of(std_instead_of_core::STD_INSTEAD_OF_CORE),
+ LintId::of(strings::STRING_ADD),
+ LintId::of(strings::STRING_SLICE),
+ LintId::of(strings::STRING_TO_STRING),
+ LintId::of(strings::STR_TO_STRING),
+ LintId::of(types::RC_BUFFER),
+ LintId::of(types::RC_MUTEX),
+ LintId::of(undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS),
+ LintId::of(unicode::NON_ASCII_LITERAL),
+ LintId::of(unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS),
+ LintId::of(unwrap_in_result::UNWRAP_IN_RESULT),
+ LintId::of(write::PRINT_STDERR),
+ LintId::of(write::PRINT_STDOUT),
+ LintId::of(write::USE_DEBUG),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::style", Some("clippy_style"), vec![
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(bool_to_int_with_if::BOOL_TO_INT_WITH_IF),
+ LintId::of(casts::FN_TO_NUMERIC_CAST),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
+ LintId::of(collapsible_if::COLLAPSIBLE_ELSE_IF),
+ LintId::of(collapsible_if::COLLAPSIBLE_IF),
+ LintId::of(comparison_chain::COMPARISON_CHAIN),
+ LintId::of(default::FIELD_REASSIGN_WITH_DEFAULT),
+ LintId::of(default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY),
+ LintId::of(dereference::NEEDLESS_BORROW),
+ LintId::of(disallowed_macros::DISALLOWED_MACROS),
+ LintId::of(disallowed_methods::DISALLOWED_METHODS),
+ LintId::of(disallowed_names::DISALLOWED_NAMES),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
++ LintId::of(format_args::UNINLINED_FORMAT_ARGS),
+ LintId::of(from_over_into::FROM_OVER_INTO),
+ LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
+ LintId::of(functions::DOUBLE_MUST_USE),
+ LintId::of(functions::MUST_USE_UNIT),
+ LintId::of(functions::RESULT_UNIT_ERR),
+ LintId::of(implicit_saturating_add::IMPLICIT_SATURATING_ADD),
++ LintId::of(implicit_saturating_sub::IMPLICIT_SATURATING_SUB),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING),
+ LintId::of(init_numbered_fields::INIT_NUMBERED_FIELDS),
+ LintId::of(len_zero::COMPARISON_TO_EMPTY),
+ LintId::of(len_zero::LEN_WITHOUT_IS_EMPTY),
+ LintId::of(len_zero::LEN_ZERO),
+ LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
+ LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
+ LintId::of(loops::FOR_KV_MAP),
+ LintId::of(loops::NEEDLESS_RANGE_LOOP),
+ LintId::of(loops::SAME_ITEM_PUSH),
+ LintId::of(loops::WHILE_LET_ON_ITERATOR),
+ LintId::of(main_recursion::MAIN_RECURSION),
+ LintId::of(manual_async_fn::MANUAL_ASYNC_FN),
+ LintId::of(manual_bits::MANUAL_BITS),
+ LintId::of(manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
+ LintId::of(match_result_ok::MATCH_RESULT_OK),
+ LintId::of(matches::COLLAPSIBLE_MATCH),
+ LintId::of(matches::INFALLIBLE_DESTRUCTURING_MATCH),
+ LintId::of(matches::MANUAL_MAP),
+ LintId::of(matches::MATCH_LIKE_MATCHES_MACRO),
+ LintId::of(matches::MATCH_OVERLAPPING_ARM),
+ LintId::of(matches::MATCH_REF_PATS),
+ LintId::of(matches::REDUNDANT_PATTERN_MATCHING),
+ LintId::of(matches::SINGLE_MATCH),
+ LintId::of(mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_DEFAULT),
+ LintId::of(methods::BYTES_NTH),
+ LintId::of(methods::CHARS_LAST_CMP),
+ LintId::of(methods::CHARS_NEXT_CMP),
+ LintId::of(methods::ERR_EXPECT),
+ LintId::of(methods::GET_FIRST),
+ LintId::of(methods::INTO_ITER_ON_REF),
+ LintId::of(methods::IS_DIGIT_ASCII_RADIX),
+ LintId::of(methods::ITER_CLONED_COLLECT),
+ LintId::of(methods::ITER_NEXT_SLICE),
+ LintId::of(methods::ITER_NTH_ZERO),
+ LintId::of(methods::ITER_SKIP_NEXT),
+ LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
+ LintId::of(methods::MAP_CLONE),
+ LintId::of(methods::MAP_COLLECT_RESULT_UNIT),
+ LintId::of(methods::MUT_MUTEX_LOCK),
+ LintId::of(methods::NEW_RET_NO_SELF),
+ LintId::of(methods::OBFUSCATED_IF_ELSE),
+ LintId::of(methods::OK_EXPECT),
+ LintId::of(methods::OPTION_MAP_OR_NONE),
+ LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
+ LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
+ LintId::of(methods::SINGLE_CHAR_ADD_STR),
+ LintId::of(methods::STRING_EXTEND_CHARS),
+ LintId::of(methods::UNNECESSARY_FOLD),
+ LintId::of(methods::UNNECESSARY_LAZY_EVALUATIONS),
+ LintId::of(methods::UNWRAP_OR_ELSE_DEFAULT),
+ LintId::of(methods::WRONG_SELF_CONVENTION),
+ LintId::of(misc::TOPLEVEL_REF_ARG),
+ LintId::of(misc::ZERO_PTR),
+ LintId::of(misc_early::BUILTIN_TYPE_SHADOW),
+ LintId::of(misc_early::DOUBLE_NEG),
+ LintId::of(misc_early::DUPLICATE_UNDERSCORE_ARGUMENT),
+ LintId::of(misc_early::MIXED_CASE_HEX_LITERALS),
+ LintId::of(misc_early::REDUNDANT_PATTERN),
+ LintId::of(mut_reference::UNNECESSARY_MUT_PASSED),
+ LintId::of(needless_late_init::NEEDLESS_LATE_INIT),
+ LintId::of(needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS),
+ LintId::of(neg_multiply::NEG_MULTIPLY),
+ LintId::of(new_without_default::NEW_WITHOUT_DEFAULT),
+ LintId::of(non_copy_const::BORROW_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
+ LintId::of(operators::ASSIGN_OP_PATTERN),
+ LintId::of(operators::OP_REF),
+ LintId::of(operators::PTR_EQ),
+ LintId::of(partialeq_to_none::PARTIALEQ_TO_NONE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(strings::TRIM_SPLIT_WHITESPACE),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(unit_types::LET_UNIT_VALUE),
+ LintId::of(unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), vec![
+ LintId::of(almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
+ LintId::of(casts::CAST_ABS_TO_UNSIGNED),
+ LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
+ LintId::of(casts::CAST_ENUM_TRUNCATION),
++ LintId::of(casts::CAST_NAN_TO_INT),
+ LintId::of(casts::CAST_SLICE_FROM_RAW_PARTS),
+ LintId::of(crate_in_macro_def::CRATE_IN_MACRO_DEF),
+ LintId::of(drop_forget_ref::DROP_NON_DROP),
+ LintId::of(drop_forget_ref::FORGET_NON_DROP),
+ LintId::of(duplicate_mod::DUPLICATE_MOD),
+ LintId::of(format_impl::PRINT_IN_FORMAT_IMPL),
+ LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+ LintId::of(loops::EMPTY_LOOP),
+ LintId::of(loops::MUT_RANGE_BOUND),
+ LintId::of(methods::NO_EFFECT_REPLACE),
+ LintId::of(methods::SUSPICIOUS_MAP),
+ LintId::of(methods::SUSPICIOUS_TO_OWNED),
+ LintId::of(multi_assignments::MULTI_ASSIGNMENTS),
+ LintId::of(mut_key::MUTABLE_KEY_TYPE),
+ LintId::of(octal_escapes::OCTAL_ESCAPES),
+ LintId::of(operators::FLOAT_EQUALITY_WITHOUT_ABS),
+ LintId::of(operators::MISREFACTORED_ASSIGN_OP),
+ LintId::of(rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+ LintId::of(swap_ptr_to_ref::SWAP_PTR_TO_REF),
+])
--- /dev/null
- extern crate rustc_mir_dataflow;
+#![feature(array_windows)]
+#![feature(binary_heap_into_iter_sorted)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(drain_filter)]
+#![feature(iter_intersperse)]
+#![feature(let_chains)]
+#![feature(lint_reasons)]
+#![feature(never_type)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![feature(stmt_expr_attributes)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_docs_in_private_items, clippy::must_use_candidate)]
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+// Disable this rustc lint for now, as it was also done in rustc
+#![allow(rustc::potential_query_instability)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_arena;
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
+extern crate rustc_data_structures;
+extern crate rustc_driver;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_analysis;
+extern crate rustc_hir_typeck;
+extern crate rustc_hir_pretty;
+extern crate rustc_index;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_lint;
+extern crate rustc_middle;
- sess.err(&format!(
+extern crate rustc_parse;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+
+#[macro_use]
+extern crate clippy_utils;
+
+use clippy_utils::parse_msrv;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_lint::LintId;
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+
+/// Macro used to declare a Clippy lint.
+///
+/// Every lint declaration consists of 4 parts:
+///
+/// 1. The documentation, which is used for the website
+/// 2. The `LINT_NAME`. See [lint naming][lint_naming] on lint naming conventions.
+/// 3. The `lint_level`, which is a mapping from *one* of our lint groups to `Allow`, `Warn` or
+/// `Deny`. The lint level here has nothing to do with what lint groups the lint is a part of.
+/// 4. The `description` that contains a short explanation on what's wrong with code where the
+/// lint is triggered.
+///
+/// Currently the categories `style`, `correctness`, `suspicious`, `complexity` and `perf` are
+/// enabled by default. As said in the README.md of this repository, if the lint level mapping
+/// changes, please update README.md.
+///
+/// # Example
+///
+/// ```
+/// #![feature(rustc_private)]
+/// extern crate rustc_session;
+/// use rustc_session::declare_tool_lint;
+/// use clippy_lints::declare_clippy_lint;
+///
+/// declare_clippy_lint! {
+/// /// ### What it does
+/// /// Checks for ... (describe what the lint matches).
+/// ///
+/// /// ### Why is this bad?
+/// /// Supply the reason for linting the code.
+/// ///
+/// /// ### Example
+/// /// ```rust
+/// /// Insert a short example of code that triggers the lint
+/// /// ```
+/// ///
+/// /// Use instead:
+/// /// ```rust
+/// /// Insert a short example of improved code that doesn't trigger the lint
+/// /// ```
+/// pub LINT_NAME,
+/// pedantic,
+/// "description"
+/// }
+/// ```
+/// [lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
+#[macro_export]
+macro_rules! declare_clippy_lint {
+ { $(#[$attr:meta])* pub $name:tt, style, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, correctness, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Deny, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, suspicious, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, complexity, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, perf, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, pedantic, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, restriction, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, cargo, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, nursery, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal_warn, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+}
+
+#[cfg(feature = "internal")]
+pub mod deprecated_lints;
+#[cfg_attr(feature = "internal", allow(clippy::missing_clippy_version_attribute))]
+mod utils;
+
+mod renamed_lints;
+
+// begin lints modules, do not remove this comment, it’s used in `update_lints`
+mod almost_complete_letter_range;
+mod approx_const;
+mod as_conversions;
+mod asm_syntax;
+mod assertions_on_constants;
+mod assertions_on_result_states;
+mod async_yields_async;
+mod attrs;
+mod await_holding_invalid;
+mod blocks_in_if_conditions;
+mod bool_assert_comparison;
+mod bool_to_int_with_if;
+mod booleans;
+mod borrow_deref_ref;
+mod box_default;
+mod cargo;
+mod casts;
+mod checked_conversions;
+mod cognitive_complexity;
+mod collapsible_if;
+mod comparison_chain;
+mod copies;
+mod copy_iterator;
+mod crate_in_macro_def;
+mod create_dir;
+mod dbg_macro;
+mod default;
+mod default_instead_of_iter_empty;
+mod default_numeric_fallback;
+mod default_union_representation;
+mod dereference;
+mod derivable_impls;
+mod derive;
+mod disallowed_macros;
+mod disallowed_methods;
+mod disallowed_names;
+mod disallowed_script_idents;
+mod disallowed_types;
+mod doc;
+mod double_parens;
+mod drop_forget_ref;
+mod duplicate_mod;
+mod else_if_without_else;
+mod empty_drop;
+mod empty_enum;
+mod empty_structs_with_brackets;
+mod entry;
+mod enum_clike;
+mod enum_variants;
+mod equatable_if_let;
+mod escape;
+mod eta_reduction;
+mod excessive_bools;
+mod exhaustive_items;
+mod exit;
+mod explicit_write;
+mod fallible_impl_from;
+mod float_literal;
+mod floating_point_arithmetic;
+mod format;
+mod format_args;
+mod format_impl;
+mod format_push_string;
+mod formatting;
+mod from_over_into;
+mod from_str_radix_10;
+mod functions;
+mod future_not_send;
+mod if_let_mutex;
+mod if_not_else;
+mod if_then_some_else_none;
+mod implicit_hasher;
+mod implicit_return;
+mod implicit_saturating_add;
+mod implicit_saturating_sub;
+mod inconsistent_struct_constructor;
+mod index_refutable_slice;
+mod indexing_slicing;
+mod infinite_iter;
+mod inherent_impl;
+mod inherent_to_string;
+mod init_numbered_fields;
+mod inline_fn_without_body;
+mod int_plus_one;
+mod invalid_upcast_comparisons;
+mod invalid_utf8_in_unchecked;
+mod items_after_statements;
+mod iter_not_returning_iterator;
+mod large_const_arrays;
+mod large_enum_variant;
+mod large_include_file;
+mod large_stack_arrays;
+mod len_zero;
+mod let_if_seq;
+mod let_underscore;
+mod lifetimes;
+mod literal_representation;
+mod loops;
+mod macro_use;
+mod main_recursion;
+mod manual_assert;
+mod manual_async_fn;
+mod manual_bits;
+mod manual_clamp;
+mod manual_instant_elapsed;
+mod manual_non_exhaustive;
+mod manual_rem_euclid;
+mod manual_retain;
+mod manual_string_new;
+mod manual_strip;
+mod map_unit_fn;
+mod match_result_ok;
+mod matches;
+mod mem_forget;
+mod mem_replace;
+mod methods;
+mod minmax;
+mod misc;
+mod misc_early;
+mod mismatching_type_param_order;
+mod missing_const_for_fn;
+mod missing_doc;
+mod missing_enforced_import_rename;
+mod missing_inline;
++mod missing_trait_methods;
+mod mixed_read_write_in_expression;
+mod module_style;
+mod multi_assignments;
+mod mut_key;
+mod mut_mut;
+mod mut_reference;
+mod mutable_debug_assertion;
+mod mutex_atomic;
+mod needless_arbitrary_self_type;
+mod needless_bool;
+mod needless_borrowed_ref;
+mod needless_continue;
+mod needless_for_each;
+mod needless_late_init;
+mod needless_parens_on_range_literals;
+mod needless_pass_by_value;
+mod needless_question_mark;
+mod needless_update;
+mod neg_cmp_op_on_partial_ord;
+mod neg_multiply;
+mod new_without_default;
+mod no_effect;
+mod non_copy_const;
+mod non_expressive_names;
+mod non_octal_unix_permissions;
+mod non_send_fields_in_send_ty;
+mod nonstandard_macro_braces;
+mod octal_escapes;
+mod only_used_in_recursion;
+mod operators;
+mod option_env_unwrap;
+mod option_if_let_else;
+mod overflow_check_conditional;
+mod panic_in_result_fn;
+mod panic_unimplemented;
++mod partial_pub_fields;
+mod partialeq_ne_impl;
+mod partialeq_to_none;
+mod pass_by_ref_or_value;
+mod pattern_type_mismatch;
+mod precedence;
+mod ptr;
+mod ptr_offset_with_cast;
+mod pub_use;
+mod question_mark;
+mod ranges;
+mod rc_clone_in_vec_init;
+mod read_zero_byte_vec;
+mod redundant_clone;
+mod redundant_closure_call;
+mod redundant_else;
+mod redundant_field_names;
+mod redundant_pub_crate;
+mod redundant_slicing;
+mod redundant_static_lifetimes;
+mod ref_option_ref;
+mod reference;
+mod regex;
+mod return_self_not_must_use;
+mod returns;
+mod same_name_method;
+mod self_named_constructors;
+mod semicolon_if_nothing_returned;
+mod serde_api;
+mod shadow;
+mod single_char_lifetime_names;
+mod single_component_path_imports;
+mod size_of_in_element_count;
+mod slow_vector_initialization;
+mod std_instead_of_core;
+mod strings;
+mod strlen_on_c_strings;
+mod suspicious_operation_groupings;
+mod suspicious_trait_impl;
+mod swap;
+mod swap_ptr_to_ref;
+mod tabs_in_doc_comments;
+mod temporary_assignment;
+mod to_digit_is_some;
+mod trailing_empty_array;
+mod trait_bounds;
+mod transmute;
+mod types;
+mod undocumented_unsafe_blocks;
+mod unicode;
+mod uninit_vec;
+mod unit_return_expecting_ord;
+mod unit_types;
+mod unnamed_address;
+mod unnecessary_owned_empty_strings;
+mod unnecessary_self_imports;
+mod unnecessary_wraps;
+mod unnested_or_patterns;
+mod unsafe_removed_from_name;
+mod unused_async;
+mod unused_io_amount;
+mod unused_peekable;
+mod unused_rounding;
+mod unused_self;
+mod unused_unit;
+mod unwrap;
+mod unwrap_in_result;
+mod upper_case_acronyms;
+mod use_self;
+mod useless_conversion;
+mod vec;
+mod vec_init_then_push;
+mod wildcard_imports;
+mod write;
+mod zero_div_zero;
+mod zero_sized_map_values;
+// end lints modules, do not remove this comment, it’s used in `update_lints`
+
+pub use crate::utils::conf::Conf;
+use crate::utils::conf::{format_error, TryConf};
+
+/// Register all pre expansion lints
+///
+/// Pre-expansion lints run before any macro expansion has happened.
+///
+/// Note that due to the architecture of the compiler, currently `cfg_attr` attributes on crate
+/// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass.
+///
+/// Used in `./src/driver.rs`.
+pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ // NOTE: Do not add any more pre-expansion passes. These should be removed eventually.
+
+ let msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
- sess.err(&format!(
++ sess.err(format!(
+ "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
+ ));
+ None
+ })
+ });
+
+ store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv }));
+}
+
+fn read_msrv(conf: &Conf, sess: &Session) -> Option<RustcVersion> {
+ let cargo_msrv = std::env::var("CARGO_PKG_RUST_VERSION")
+ .ok()
+ .and_then(|v| parse_msrv(&v, None, None));
+ let clippy_msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
- sess.warn(&format!(
++ sess.err(format!(
+ "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
+ ));
+ None
+ })
+ });
+
+ if let Some(cargo_msrv) = cargo_msrv {
+ if let Some(clippy_msrv) = clippy_msrv {
+ // if both files have an msrv, let's compare them and emit a warning if they differ
+ if clippy_msrv != cargo_msrv {
- sess.err(&format!(
++ sess.warn(format!(
+ "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
+ ));
+ }
+
+ Some(clippy_msrv)
+ } else {
+ Some(cargo_msrv)
+ }
+ } else {
+ clippy_msrv
+ }
+}
+
+#[doc(hidden)]
+pub fn read_conf(sess: &Session) -> Conf {
+ let file_name = match utils::conf::lookup_conf_file() {
+ Ok(Some(path)) => path,
+ Ok(None) => return Conf::default(),
+ Err(error) => {
+ sess.struct_err(&format!("error finding Clippy's configuration file: {error}"))
+ .emit();
+ return Conf::default();
+ },
+ };
+
+ let TryConf { conf, errors, warnings } = utils::conf::read(&file_name);
+ // all conf errors are non-fatal, we just use the default conf in case of error
+ for error in errors {
- sess.struct_warn(&format!(
++ sess.err(format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ format_error(error)
+ ));
+ }
+
+ for warning in warnings {
- store.register_early_pass(|| Box::new(utils::internal_lints::ClippyLintsInternal));
- store.register_early_pass(|| Box::new(utils::internal_lints::ProduceIce));
- store.register_late_pass(|_| Box::new(utils::internal_lints::CollapsibleCalls));
- store.register_late_pass(|_| Box::new(utils::internal_lints::CompilerLintFunctions::new()));
- store.register_late_pass(|_| Box::new(utils::internal_lints::IfChainStyle));
- store.register_late_pass(|_| Box::new(utils::internal_lints::InvalidPaths));
- store.register_late_pass(|_| Box::<utils::internal_lints::InterningDefinedSymbol>::default());
- store.register_late_pass(|_| Box::<utils::internal_lints::LintWithoutLintPass>::default());
- store.register_late_pass(|_| Box::new(utils::internal_lints::UnnecessaryDefPath));
- store.register_late_pass(|_| Box::new(utils::internal_lints::OuterExpnDataPass));
- store.register_late_pass(|_| Box::new(utils::internal_lints::MsrvAttrImpl));
++ sess.struct_warn(format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ format_error(warning)
+ ))
+ .emit();
+ }
+
+ conf
+}
+
+/// Register all lints and lint groups with the rustc plugin registry
+///
+/// Used in `./src/driver.rs`.
+#[expect(clippy::too_many_lines)]
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ register_removed_non_tool_lints(store);
+
+ include!("lib.deprecated.rs");
+
+ include!("lib.register_lints.rs");
+ include!("lib.register_restriction.rs");
+ include!("lib.register_pedantic.rs");
+
+ #[cfg(feature = "internal")]
+ include!("lib.register_internal.rs");
+
+ include!("lib.register_all.rs");
+ include!("lib.register_style.rs");
+ include!("lib.register_complexity.rs");
+ include!("lib.register_correctness.rs");
+ include!("lib.register_suspicious.rs");
+ include!("lib.register_perf.rs");
+ include!("lib.register_cargo.rs");
+ include!("lib.register_nursery.rs");
+
+ #[cfg(feature = "internal")]
+ {
+ if std::env::var("ENABLE_METADATA_COLLECTION").eq(&Ok("1".to_string())) {
+ store.register_late_pass(|_| Box::new(utils::internal_lints::metadata_collector::MetadataCollector::new()));
+ return;
+ }
+ }
+
+ // all the internal lints
+ #[cfg(feature = "internal")]
+ {
++ store.register_early_pass(|| Box::new(utils::internal_lints::clippy_lints_internal::ClippyLintsInternal));
++ store.register_early_pass(|| Box::new(utils::internal_lints::produce_ice::ProduceIce));
++ store.register_late_pass(|_| Box::new(utils::internal_lints::collapsible_calls::CollapsibleCalls));
++ store.register_late_pass(|_| {
++ Box::new(utils::internal_lints::compiler_lint_functions::CompilerLintFunctions::new())
++ });
++ store.register_late_pass(|_| Box::new(utils::internal_lints::if_chain_style::IfChainStyle));
++ store.register_late_pass(|_| Box::new(utils::internal_lints::invalid_paths::InvalidPaths));
++ store.register_late_pass(|_| {
++ Box::<utils::internal_lints::interning_defined_symbol::InterningDefinedSymbol>::default()
++ });
++ store.register_late_pass(|_| {
++ Box::<utils::internal_lints::lint_without_lint_pass::LintWithoutLintPass>::default()
++ });
++ store.register_late_pass(|_| Box::<utils::internal_lints::unnecessary_def_path::UnnecessaryDefPath>::default());
++ store.register_late_pass(|_| Box::new(utils::internal_lints::outer_expn_data_pass::OuterExpnDataPass));
++ store.register_late_pass(|_| Box::new(utils::internal_lints::msrv_attr_impl::MsrvAttrImpl));
+ }
+
+ let arithmetic_side_effects_allowed = conf.arithmetic_side_effects_allowed.clone();
+ store.register_late_pass(move |_| {
+ Box::new(operators::arithmetic_side_effects::ArithmeticSideEffects::new(
+ arithmetic_side_effects_allowed.clone(),
+ ))
+ });
+ store.register_late_pass(|_| Box::new(utils::dump_hir::DumpHir));
+ store.register_late_pass(|_| Box::new(utils::author::Author));
+ let await_holding_invalid_types = conf.await_holding_invalid_types.clone();
+ store.register_late_pass(move |_| {
+ Box::new(await_holding_invalid::AwaitHolding::new(
+ await_holding_invalid_types.clone(),
+ ))
+ });
+ store.register_late_pass(|_| Box::new(serde_api::SerdeApi));
+ let vec_box_size_threshold = conf.vec_box_size_threshold;
+ let type_complexity_threshold = conf.type_complexity_threshold;
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ store.register_late_pass(move |_| {
+ Box::new(types::Types::new(
+ vec_box_size_threshold,
+ type_complexity_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_late_pass(|_| Box::new(booleans::NonminimalBool));
+ store.register_late_pass(|_| Box::new(enum_clike::UnportableVariant));
+ store.register_late_pass(|_| Box::new(float_literal::FloatLiteral));
+ store.register_late_pass(|_| Box::new(ptr::Ptr));
+ store.register_late_pass(|_| Box::new(needless_bool::NeedlessBool));
+ store.register_late_pass(|_| Box::new(needless_bool::BoolComparison));
+ store.register_late_pass(|_| Box::new(needless_for_each::NeedlessForEach));
+ store.register_late_pass(|_| Box::new(misc::MiscLints));
+ store.register_late_pass(|_| Box::new(eta_reduction::EtaReduction));
+ store.register_late_pass(|_| Box::new(mut_mut::MutMut));
+ store.register_late_pass(|_| Box::new(mut_reference::UnnecessaryMutPassed));
+ store.register_late_pass(|_| Box::new(len_zero::LenZero));
+ store.register_late_pass(|_| Box::new(attrs::Attributes));
+ store.register_late_pass(|_| Box::new(blocks_in_if_conditions::BlocksInIfConditions));
+ store.register_late_pass(|_| Box::new(unicode::Unicode));
+ store.register_late_pass(|_| Box::new(uninit_vec::UninitVec));
+ store.register_late_pass(|_| Box::new(unit_return_expecting_ord::UnitReturnExpectingOrd));
+ store.register_late_pass(|_| Box::new(strings::StringAdd));
+ store.register_late_pass(|_| Box::new(implicit_return::ImplicitReturn));
+ store.register_late_pass(|_| Box::new(implicit_saturating_sub::ImplicitSaturatingSub));
+ store.register_late_pass(|_| Box::new(default_numeric_fallback::DefaultNumericFallback));
+ store.register_late_pass(|_| Box::new(inconsistent_struct_constructor::InconsistentStructConstructor));
+ store.register_late_pass(|_| Box::new(non_octal_unix_permissions::NonOctalUnixPermissions));
+ store.register_early_pass(|| Box::new(unnecessary_self_imports::UnnecessarySelfImports));
+
+ let msrv = read_msrv(conf, sess);
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ let allow_expect_in_tests = conf.allow_expect_in_tests;
+ let allow_unwrap_in_tests = conf.allow_unwrap_in_tests;
+ store.register_late_pass(move |_| Box::new(approx_const::ApproxConstant::new(msrv)));
+ store.register_late_pass(move |_| {
+ Box::new(methods::Methods::new(
+ avoid_breaking_exported_api,
+ msrv,
+ allow_expect_in_tests,
+ allow_unwrap_in_tests,
+ ))
+ });
+ store.register_late_pass(move |_| Box::new(matches::Matches::new(msrv)));
+ store.register_early_pass(move || Box::new(manual_non_exhaustive::ManualNonExhaustiveStruct::new(msrv)));
+ store.register_late_pass(move |_| Box::new(manual_non_exhaustive::ManualNonExhaustiveEnum::new(msrv)));
+ store.register_late_pass(move |_| Box::new(manual_strip::ManualStrip::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_static_lifetimes::RedundantStaticLifetimes::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_field_names::RedundantFieldNames::new(msrv)));
+ store.register_late_pass(move |_| Box::new(checked_conversions::CheckedConversions::new(msrv)));
+ store.register_late_pass(move |_| Box::new(mem_replace::MemReplace::new(msrv)));
+ store.register_late_pass(move |_| Box::new(ranges::Ranges::new(msrv)));
+ store.register_late_pass(move |_| Box::new(from_over_into::FromOverInto::new(msrv)));
+ store.register_late_pass(move |_| Box::new(use_self::UseSelf::new(msrv)));
+ store.register_late_pass(move |_| Box::new(missing_const_for_fn::MissingConstForFn::new(msrv)));
+ store.register_late_pass(move |_| Box::new(needless_question_mark::NeedlessQuestionMark));
+ store.register_late_pass(move |_| Box::new(casts::Casts::new(msrv)));
+ store.register_early_pass(move || Box::new(unnested_or_patterns::UnnestedOrPatterns::new(msrv)));
+ store.register_late_pass(|_| Box::new(size_of_in_element_count::SizeOfInElementCount));
+ store.register_late_pass(|_| Box::new(same_name_method::SameNameMethod));
+ let max_suggested_slice_pattern_length = conf.max_suggested_slice_pattern_length;
+ store.register_late_pass(move |_| {
+ Box::new(index_refutable_slice::IndexRefutableSlice::new(
+ max_suggested_slice_pattern_length,
+ msrv,
+ ))
+ });
+ store.register_late_pass(|_| Box::<shadow::Shadow>::default());
+ store.register_late_pass(|_| Box::new(unit_types::UnitTypes));
+ store.register_late_pass(|_| Box::new(loops::Loops));
+ store.register_late_pass(|_| Box::<main_recursion::MainRecursion>::default());
+ store.register_late_pass(|_| Box::new(lifetimes::Lifetimes));
+ store.register_late_pass(|_| Box::new(entry::HashMapPass));
+ store.register_late_pass(|_| Box::new(minmax::MinMaxPass));
+ store.register_late_pass(|_| Box::new(zero_div_zero::ZeroDiv));
+ store.register_late_pass(|_| Box::new(mutex_atomic::Mutex));
+ store.register_late_pass(|_| Box::new(needless_update::NeedlessUpdate));
+ store.register_late_pass(|_| Box::new(needless_borrowed_ref::NeedlessBorrowedRef));
+ store.register_late_pass(|_| Box::new(borrow_deref_ref::BorrowDerefRef));
+ store.register_late_pass(|_| Box::new(no_effect::NoEffect));
+ store.register_late_pass(|_| Box::new(temporary_assignment::TemporaryAssignment));
+ store.register_late_pass(move |_| Box::new(transmute::Transmute::new(msrv)));
+ let cognitive_complexity_threshold = conf.cognitive_complexity_threshold;
+ store.register_late_pass(move |_| {
+ Box::new(cognitive_complexity::CognitiveComplexity::new(
+ cognitive_complexity_threshold,
+ ))
+ });
+ let too_large_for_stack = conf.too_large_for_stack;
+ store.register_late_pass(move |_| Box::new(escape::BoxedLocal { too_large_for_stack }));
+ store.register_late_pass(move |_| Box::new(vec::UselessVec { too_large_for_stack }));
+ store.register_late_pass(|_| Box::new(panic_unimplemented::PanicUnimplemented));
+ store.register_late_pass(|_| Box::new(strings::StringLitAsBytes));
+ store.register_late_pass(|_| Box::new(derive::Derive));
+ store.register_late_pass(|_| Box::new(derivable_impls::DerivableImpls));
+ store.register_late_pass(|_| Box::new(drop_forget_ref::DropForgetRef));
+ store.register_late_pass(|_| Box::new(empty_enum::EmptyEnum));
+ store.register_late_pass(|_| Box::new(invalid_upcast_comparisons::InvalidUpcastComparisons));
+ store.register_late_pass(|_| Box::new(regex::Regex));
+ store.register_late_pass(|_| Box::new(copies::CopyAndPaste));
+ store.register_late_pass(|_| Box::new(copy_iterator::CopyIterator));
+ store.register_late_pass(|_| Box::new(format::UselessFormat));
+ store.register_late_pass(|_| Box::new(swap::Swap));
+ store.register_late_pass(|_| Box::new(overflow_check_conditional::OverflowCheckConditional));
+ store.register_late_pass(|_| Box::<new_without_default::NewWithoutDefault>::default());
+ let disallowed_names = conf.disallowed_names.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move |_| Box::new(disallowed_names::DisallowedNames::new(disallowed_names.clone())));
+ let too_many_arguments_threshold = conf.too_many_arguments_threshold;
+ let too_many_lines_threshold = conf.too_many_lines_threshold;
+ let large_error_threshold = conf.large_error_threshold;
+ store.register_late_pass(move |_| {
+ Box::new(functions::Functions::new(
+ too_many_arguments_threshold,
+ too_many_lines_threshold,
+ large_error_threshold,
+ ))
+ });
+ let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move |_| Box::new(doc::DocMarkdown::new(doc_valid_idents.clone())));
+ store.register_late_pass(|_| Box::new(neg_multiply::NegMultiply));
+ store.register_late_pass(|_| Box::new(mem_forget::MemForget));
+ store.register_late_pass(|_| Box::new(let_if_seq::LetIfSeq));
+ store.register_late_pass(|_| Box::new(mixed_read_write_in_expression::EvalOrderDependence));
+ store.register_late_pass(|_| Box::new(missing_doc::MissingDoc::new()));
+ store.register_late_pass(|_| Box::new(missing_inline::MissingInline));
+ store.register_late_pass(move |_| Box::new(exhaustive_items::ExhaustiveItems));
+ store.register_late_pass(|_| Box::new(match_result_ok::MatchResultOk));
+ store.register_late_pass(|_| Box::new(partialeq_ne_impl::PartialEqNeImpl));
+ store.register_late_pass(|_| Box::new(unused_io_amount::UnusedIoAmount));
+ let enum_variant_size_threshold = conf.enum_variant_size_threshold;
+ store.register_late_pass(move |_| Box::new(large_enum_variant::LargeEnumVariant::new(enum_variant_size_threshold)));
+ store.register_late_pass(|_| Box::new(explicit_write::ExplicitWrite));
+ store.register_late_pass(|_| Box::new(needless_pass_by_value::NeedlessPassByValue));
+ let pass_by_ref_or_value = pass_by_ref_or_value::PassByRefOrValue::new(
+ conf.trivial_copy_size_limit,
+ conf.pass_by_value_size_limit,
+ conf.avoid_breaking_exported_api,
+ &sess.target,
+ );
+ store.register_late_pass(move |_| Box::new(pass_by_ref_or_value));
+ store.register_late_pass(|_| Box::new(ref_option_ref::RefOptionRef));
+ store.register_late_pass(|_| Box::new(infinite_iter::InfiniteIter));
+ store.register_late_pass(|_| Box::new(inline_fn_without_body::InlineFnWithoutBody));
+ store.register_late_pass(|_| Box::<useless_conversion::UselessConversion>::default());
+ store.register_late_pass(|_| Box::new(implicit_hasher::ImplicitHasher));
+ store.register_late_pass(|_| Box::new(fallible_impl_from::FallibleImplFrom));
+ store.register_late_pass(|_| Box::new(question_mark::QuestionMark));
+ store.register_early_pass(|| Box::new(suspicious_operation_groupings::SuspiciousOperationGroupings));
+ store.register_late_pass(|_| Box::new(suspicious_trait_impl::SuspiciousImpl));
+ store.register_late_pass(|_| Box::new(map_unit_fn::MapUnit));
+ store.register_late_pass(|_| Box::new(inherent_impl::MultipleInherentImpl));
+ store.register_late_pass(|_| Box::new(neg_cmp_op_on_partial_ord::NoNegCompOpForPartialOrd));
+ store.register_late_pass(|_| Box::new(unwrap::Unwrap));
+ store.register_late_pass(|_| Box::new(indexing_slicing::IndexingSlicing));
+ store.register_late_pass(|_| Box::new(non_copy_const::NonCopyConst));
+ store.register_late_pass(|_| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
+ store.register_late_pass(|_| Box::new(redundant_clone::RedundantClone));
+ store.register_late_pass(|_| Box::new(slow_vector_initialization::SlowVectorInit));
+ store.register_late_pass(move |_| Box::new(unnecessary_wraps::UnnecessaryWraps::new(avoid_breaking_exported_api)));
+ store.register_late_pass(|_| Box::new(assertions_on_constants::AssertionsOnConstants));
+ store.register_late_pass(|_| Box::new(assertions_on_result_states::AssertionsOnResultStates));
+ store.register_late_pass(|_| Box::new(inherent_to_string::InherentToString));
+ let max_trait_bounds = conf.max_trait_bounds;
+ store.register_late_pass(move |_| Box::new(trait_bounds::TraitBounds::new(max_trait_bounds)));
+ store.register_late_pass(|_| Box::new(comparison_chain::ComparisonChain));
+ store.register_late_pass(|_| Box::new(mut_key::MutableKeyType));
+ store.register_early_pass(|| Box::new(reference::DerefAddrOf));
+ store.register_early_pass(|| Box::new(double_parens::DoubleParens));
+ store.register_late_pass(|_| Box::new(format_impl::FormatImpl::new()));
+ store.register_early_pass(|| Box::new(unsafe_removed_from_name::UnsafeNameRemoval));
+ store.register_early_pass(|| Box::new(else_if_without_else::ElseIfWithoutElse));
+ store.register_early_pass(|| Box::new(int_plus_one::IntPlusOne));
+ store.register_early_pass(|| Box::new(formatting::Formatting));
+ store.register_early_pass(|| Box::new(misc_early::MiscEarlyLints));
+ store.register_early_pass(|| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_late_pass(|_| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_early_pass(|| Box::new(unused_unit::UnusedUnit));
+ store.register_late_pass(|_| Box::new(returns::Return));
+ store.register_early_pass(|| Box::new(collapsible_if::CollapsibleIf));
+ store.register_early_pass(|| Box::new(items_after_statements::ItemsAfterStatements));
+ store.register_early_pass(|| Box::new(precedence::Precedence));
+ store.register_late_pass(|_| Box::new(needless_parens_on_range_literals::NeedlessParensOnRangeLiterals));
+ store.register_early_pass(|| Box::new(needless_continue::NeedlessContinue));
+ store.register_early_pass(|| Box::new(redundant_else::RedundantElse));
+ store.register_late_pass(|_| Box::new(create_dir::CreateDir));
+ store.register_early_pass(|| Box::new(needless_arbitrary_self_type::NeedlessArbitrarySelfType));
+ let literal_representation_lint_fraction_readability = conf.unreadable_literal_lint_fractions;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::LiteralDigitGrouping::new(
+ literal_representation_lint_fraction_readability,
+ ))
+ });
+ let literal_representation_threshold = conf.literal_representation_threshold;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::DecimalLiteralRepresentation::new(
+ literal_representation_threshold,
+ ))
+ });
+ let enum_variant_name_threshold = conf.enum_variant_name_threshold;
+ store.register_late_pass(move |_| {
+ Box::new(enum_variants::EnumVariantNames::new(
+ enum_variant_name_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_early_pass(|| Box::new(tabs_in_doc_comments::TabsInDocComments));
+ let upper_case_acronyms_aggressive = conf.upper_case_acronyms_aggressive;
+ store.register_late_pass(move |_| {
+ Box::new(upper_case_acronyms::UpperCaseAcronyms::new(
+ avoid_breaking_exported_api,
+ upper_case_acronyms_aggressive,
+ ))
+ });
+ store.register_late_pass(|_| Box::<default::Default>::default());
+ store.register_late_pass(move |_| Box::new(unused_self::UnusedSelf::new(avoid_breaking_exported_api)));
+ store.register_late_pass(|_| Box::new(mutable_debug_assertion::DebugAssertWithMutCall));
+ store.register_late_pass(|_| Box::new(exit::Exit));
+ store.register_late_pass(|_| Box::new(to_digit_is_some::ToDigitIsSome));
+ let array_size_threshold = conf.array_size_threshold;
+ store.register_late_pass(move |_| Box::new(large_stack_arrays::LargeStackArrays::new(array_size_threshold)));
+ store.register_late_pass(move |_| Box::new(large_const_arrays::LargeConstArrays::new(array_size_threshold)));
+ store.register_late_pass(|_| Box::new(floating_point_arithmetic::FloatingPointArithmetic));
+ store.register_early_pass(|| Box::new(as_conversions::AsConversions));
+ store.register_late_pass(|_| Box::new(let_underscore::LetUnderscore));
+ store.register_early_pass(|| Box::new(single_component_path_imports::SingleComponentPathImports));
+ let max_fn_params_bools = conf.max_fn_params_bools;
+ let max_struct_bools = conf.max_struct_bools;
+ store.register_early_pass(move || {
+ Box::new(excessive_bools::ExcessiveBools::new(
+ max_struct_bools,
+ max_fn_params_bools,
+ ))
+ });
+ store.register_early_pass(|| Box::new(option_env_unwrap::OptionEnvUnwrap));
+ let warn_on_all_wildcard_imports = conf.warn_on_all_wildcard_imports;
+ store.register_late_pass(move |_| Box::new(wildcard_imports::WildcardImports::new(warn_on_all_wildcard_imports)));
+ store.register_late_pass(|_| Box::<redundant_pub_crate::RedundantPubCrate>::default());
+ store.register_late_pass(|_| Box::new(unnamed_address::UnnamedAddress));
+ store.register_late_pass(move |_| Box::new(dereference::Dereferencing::new(msrv)));
+ store.register_late_pass(|_| Box::new(option_if_let_else::OptionIfLetElse));
+ store.register_late_pass(|_| Box::new(future_not_send::FutureNotSend));
+ store.register_late_pass(|_| Box::new(if_let_mutex::IfLetMutex));
+ store.register_late_pass(|_| Box::new(if_not_else::IfNotElse));
+ store.register_late_pass(|_| Box::new(equatable_if_let::PatternEquality));
+ store.register_late_pass(|_| Box::new(manual_async_fn::ManualAsyncFn));
+ store.register_late_pass(|_| Box::new(panic_in_result_fn::PanicInResultFn));
+ let single_char_binding_names_threshold = conf.single_char_binding_names_threshold;
+ store.register_early_pass(move || {
+ Box::new(non_expressive_names::NonExpressiveNames {
+ single_char_binding_names_threshold,
+ })
+ });
+ let macro_matcher = conf.standard_macro_braces.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_early_pass(move || Box::new(nonstandard_macro_braces::MacroBraces::new(¯o_matcher)));
+ store.register_late_pass(|_| Box::<macro_use::MacroUseImports>::default());
+ store.register_late_pass(|_| Box::new(pattern_type_mismatch::PatternTypeMismatch));
+ store.register_late_pass(|_| Box::new(unwrap_in_result::UnwrapInResult));
+ store.register_late_pass(|_| Box::new(semicolon_if_nothing_returned::SemicolonIfNothingReturned));
+ store.register_late_pass(|_| Box::new(async_yields_async::AsyncYieldsAsync));
+ let disallowed_macros = conf.disallowed_macros.clone();
+ store.register_late_pass(move |_| Box::new(disallowed_macros::DisallowedMacros::new(disallowed_macros.clone())));
+ let disallowed_methods = conf.disallowed_methods.clone();
+ store.register_late_pass(move |_| Box::new(disallowed_methods::DisallowedMethods::new(disallowed_methods.clone())));
+ store.register_early_pass(|| Box::new(asm_syntax::InlineAsmX86AttSyntax));
+ store.register_early_pass(|| Box::new(asm_syntax::InlineAsmX86IntelSyntax));
+ store.register_late_pass(|_| Box::new(empty_drop::EmptyDrop));
+ store.register_late_pass(|_| Box::new(strings::StrToString));
+ store.register_late_pass(|_| Box::new(strings::StringToString));
+ store.register_late_pass(|_| Box::new(zero_sized_map_values::ZeroSizedMapValues));
+ store.register_late_pass(|_| Box::<vec_init_then_push::VecInitThenPush>::default());
+ store.register_late_pass(|_| Box::new(redundant_slicing::RedundantSlicing));
+ store.register_late_pass(|_| Box::new(from_str_radix_10::FromStrRadix10));
+ store.register_late_pass(move |_| Box::new(if_then_some_else_none::IfThenSomeElseNone::new(msrv)));
+ store.register_late_pass(|_| Box::new(bool_assert_comparison::BoolAssertComparison));
+ store.register_early_pass(move || Box::new(module_style::ModStyle));
+ store.register_late_pass(|_| Box::new(unused_async::UnusedAsync));
+ let disallowed_types = conf.disallowed_types.clone();
+ store.register_late_pass(move |_| Box::new(disallowed_types::DisallowedTypes::new(disallowed_types.clone())));
+ let import_renames = conf.enforced_import_renames.clone();
+ store.register_late_pass(move |_| {
+ Box::new(missing_enforced_import_rename::ImportRename::new(
+ import_renames.clone(),
+ ))
+ });
+ let scripts = conf.allowed_scripts.clone();
+ store.register_early_pass(move || Box::new(disallowed_script_idents::DisallowedScriptIdents::new(&scripts)));
+ store.register_late_pass(|_| Box::new(strlen_on_c_strings::StrlenOnCStrings));
+ store.register_late_pass(move |_| Box::new(self_named_constructors::SelfNamedConstructors));
+ store.register_late_pass(move |_| Box::new(iter_not_returning_iterator::IterNotReturningIterator));
+ store.register_late_pass(move |_| Box::new(manual_assert::ManualAssert));
+ let enable_raw_pointer_heuristic_for_send = conf.enable_raw_pointer_heuristic_for_send;
+ store.register_late_pass(move |_| {
+ Box::new(non_send_fields_in_send_ty::NonSendFieldInSendTy::new(
+ enable_raw_pointer_heuristic_for_send,
+ ))
+ });
+ store.register_late_pass(move |_| Box::new(undocumented_unsafe_blocks::UndocumentedUnsafeBlocks));
+ store.register_late_pass(move |_| Box::new(format_args::FormatArgs::new(msrv)));
+ store.register_late_pass(|_| Box::new(trailing_empty_array::TrailingEmptyArray));
+ store.register_early_pass(|| Box::new(octal_escapes::OctalEscapes));
+ store.register_late_pass(|_| Box::new(needless_late_init::NeedlessLateInit));
+ store.register_late_pass(|_| Box::new(return_self_not_must_use::ReturnSelfNotMustUse));
+ store.register_late_pass(|_| Box::new(init_numbered_fields::NumberedFields));
+ store.register_early_pass(|| Box::new(single_char_lifetime_names::SingleCharLifetimeNames));
+ store.register_late_pass(move |_| Box::new(manual_bits::ManualBits::new(msrv)));
+ store.register_late_pass(|_| Box::new(default_union_representation::DefaultUnionRepresentation));
+ store.register_late_pass(|_| Box::<only_used_in_recursion::OnlyUsedInRecursion>::default());
+ let allow_dbg_in_tests = conf.allow_dbg_in_tests;
+ store.register_late_pass(move |_| Box::new(dbg_macro::DbgMacro::new(allow_dbg_in_tests)));
+ let cargo_ignore_publish = conf.cargo_ignore_publish;
+ store.register_late_pass(move |_| {
+ Box::new(cargo::Cargo {
+ ignore_publish: cargo_ignore_publish,
+ })
+ });
+ store.register_late_pass(|_| Box::<write::Write>::default());
+ store.register_early_pass(|| Box::new(crate_in_macro_def::CrateInMacroDef));
+ store.register_early_pass(|| Box::new(empty_structs_with_brackets::EmptyStructsWithBrackets));
+ store.register_late_pass(|_| Box::new(unnecessary_owned_empty_strings::UnnecessaryOwnedEmptyStrings));
+ store.register_early_pass(|| Box::new(pub_use::PubUse));
+ store.register_late_pass(|_| Box::new(format_push_string::FormatPushString));
+ let max_include_file_size = conf.max_include_file_size;
+ store.register_late_pass(move |_| Box::new(large_include_file::LargeIncludeFile::new(max_include_file_size)));
+ store.register_late_pass(|_| Box::new(strings::TrimSplitWhitespace));
+ store.register_late_pass(|_| Box::new(rc_clone_in_vec_init::RcCloneInVecInit));
+ store.register_early_pass(|| Box::<duplicate_mod::DuplicateMod>::default());
+ store.register_early_pass(|| Box::new(unused_rounding::UnusedRounding));
+ store.register_early_pass(move || Box::new(almost_complete_letter_range::AlmostCompleteLetterRange::new(msrv)));
+ store.register_late_pass(|_| Box::new(swap_ptr_to_ref::SwapPtrToRef));
+ store.register_late_pass(|_| Box::new(mismatching_type_param_order::TypeParamMismatch));
+ store.register_late_pass(|_| Box::new(read_zero_byte_vec::ReadZeroByteVec));
+ store.register_late_pass(|_| Box::new(default_instead_of_iter_empty::DefaultIterEmpty));
+ store.register_late_pass(move |_| Box::new(manual_rem_euclid::ManualRemEuclid::new(msrv)));
+ store.register_late_pass(move |_| Box::new(manual_retain::ManualRetain::new(msrv)));
+ let verbose_bit_mask_threshold = conf.verbose_bit_mask_threshold;
+ store.register_late_pass(move |_| Box::new(operators::Operators::new(verbose_bit_mask_threshold)));
+ store.register_late_pass(|_| Box::new(invalid_utf8_in_unchecked::InvalidUtf8InUnchecked));
+ store.register_late_pass(|_| Box::<std_instead_of_core::StdReexports>::default());
+ store.register_late_pass(|_| Box::new(manual_instant_elapsed::ManualInstantElapsed));
+ store.register_late_pass(|_| Box::new(partialeq_to_none::PartialeqToNone));
+ store.register_late_pass(move |_| Box::new(manual_clamp::ManualClamp::new(msrv)));
+ store.register_late_pass(|_| Box::new(manual_string_new::ManualStringNew));
+ store.register_late_pass(|_| Box::new(unused_peekable::UnusedPeekable));
+ store.register_early_pass(|| Box::new(multi_assignments::MultiAssignments));
+ store.register_late_pass(|_| Box::new(bool_to_int_with_if::BoolToIntWithIf));
+ store.register_late_pass(|_| Box::new(box_default::BoxDefault));
+ store.register_late_pass(|_| Box::new(implicit_saturating_add::ImplicitSaturatingAdd));
++ store.register_early_pass(|| Box::new(partial_pub_fields::PartialPubFields));
++ store.register_late_pass(|_| Box::new(missing_trait_methods::MissingTraitMethods));
+ // add lints here, do not remove this comment, it's used in `new_lint`
+}
+
+#[rustfmt::skip]
+fn register_removed_non_tool_lints(store: &mut rustc_lint::LintStore) {
+ store.register_removed(
+ "should_assert_eq",
+ "`assert!()` will be more flexible with RFC 2011",
+ );
+ store.register_removed(
+ "extend_from_slice",
+ "`.extend_from_slice(_)` is a faster way to extend a Vec by a slice",
+ );
+ store.register_removed(
+ "range_step_by_zero",
+ "`iterator.step_by(0)` panics nowadays",
+ );
+ store.register_removed(
+ "unstable_as_slice",
+ "`Vec::as_slice` has been stabilized in 1.7",
+ );
+ store.register_removed(
+ "unstable_as_mut_slice",
+ "`Vec::as_mut_slice` has been stabilized in 1.7",
+ );
+ store.register_removed(
+ "misaligned_transmute",
+ "this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr",
+ );
+ store.register_removed(
+ "assign_ops",
+ "using compound assignment operators (e.g., `+=`) is harmless",
+ );
+ store.register_removed(
+ "if_let_redundant_pattern_matching",
+ "this lint has been changed to redundant_pattern_matching",
+ );
+ store.register_removed(
+ "unsafe_vector_initialization",
+ "the replacement suggested by this lint had substantially different behavior",
+ );
+ store.register_removed(
+ "reverse_range_loop",
+ "this lint is now included in reversed_empty_ranges",
+ );
+}
+
+/// Register renamed lints.
+///
+/// Used in `./src/driver.rs`.
+pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
+ for (old_name, new_name) in renamed_lints::RENAMED_LINTS {
+ ls.register_renamed(old_name, new_name);
+ }
+}
+
+// only exists to let the dogfood integration test works.
+// Don't run clippy as an executable directly
+#[allow(dead_code)]
+fn main() {
+ panic!("Please use the cargo-clippy executable");
+}
--- /dev/null
- use clippy_utils::{contains_name, higher, is_integer_const, match_trait_method, paths, sugg, SpanlessEq};
+use super::NEEDLESS_RANGE_LOOP;
+use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
+use clippy_utils::source::snippet;
+use clippy_utils::ty::has_iter_method;
+use clippy_utils::visitors::is_local_used;
- let extent = self.cx
++use clippy_utils::{contains_name, higher, is_integer_const, sugg, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{BinOpKind, BorrowKind, Closure, Expr, ExprKind, HirId, Mutability, Pat, PatKind, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::middle::region;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::{sym, Symbol};
+use std::iter::{self, Iterator};
+use std::mem;
+
+/// Checks for looping over a range and then indexing a sequence with it.
+/// The iteratee must be a range literal.
+#[expect(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ arg: &'tcx Expr<'_>,
+ body: &'tcx Expr<'_>,
+ expr: &'tcx Expr<'_>,
+) {
+ if let Some(higher::Range {
+ start: Some(start),
+ ref end,
+ limits,
+ }) = higher::Range::hir(arg)
+ {
+ // the var must be a single name
+ if let PatKind::Binding(_, canonical_id, ident, _) = pat.kind {
+ let mut visitor = VarVisitor {
+ cx,
+ var: canonical_id,
+ indexed_mut: FxHashSet::default(),
+ indexed_indirectly: FxHashMap::default(),
+ indexed_directly: FxHashMap::default(),
+ referenced: FxHashSet::default(),
+ nonindex: false,
+ prefer_mutable: false,
+ };
+ walk_expr(&mut visitor, body);
+
+ // linting condition: we only indexed one variable, and indexed it directly
+ if visitor.indexed_indirectly.is_empty() && visitor.indexed_directly.len() == 1 {
+ let (indexed, (indexed_extent, indexed_ty)) = visitor
+ .indexed_directly
+ .into_iter()
+ .next()
+ .expect("already checked that we have exactly 1 element");
+
+ // ensure that the indexed variable was declared before the loop, see #601
+ if let Some(indexed_extent) = indexed_extent {
+ let parent_def_id = cx.tcx.hir().get_parent_item(expr.hir_id);
+ let region_scope_tree = cx.tcx.region_scope_tree(parent_def_id);
+ let pat_extent = region_scope_tree.var_scope(pat.hir_id.local_id).unwrap();
+ if region_scope_tree.is_subscope_of(indexed_extent, pat_extent) {
+ return;
+ }
+ }
+
+ // don't lint if the container that is indexed does not have .iter() method
+ let has_iter = has_iter_method(cx, indexed_ty);
+ if has_iter.is_none() {
+ return;
+ }
+
+ // don't lint if the container that is indexed into is also used without
+ // indexing
+ if visitor.referenced.contains(&indexed) {
+ return;
+ }
+
+ let starts_at_zero = is_integer_const(cx, start, 0);
+
+ let skip = if starts_at_zero {
+ String::new()
+ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, start) {
+ return;
+ } else {
+ format!(".skip({})", snippet(cx, start.span, ".."))
+ };
+
+ let mut end_is_start_plus_val = false;
+
+ let take = if let Some(end) = *end {
+ let mut take_expr = end;
+
+ if let ExprKind::Binary(ref op, left, right) = end.kind {
+ if op.node == BinOpKind::Add {
+ let start_equal_left = SpanlessEq::new(cx).eq_expr(start, left);
+ let start_equal_right = SpanlessEq::new(cx).eq_expr(start, right);
+
+ if start_equal_left {
+ take_expr = right;
+ } else if start_equal_right {
+ take_expr = left;
+ }
+
+ end_is_start_plus_val = start_equal_left | start_equal_right;
+ }
+ }
+
+ if is_len_call(end, indexed) || is_end_eq_array_len(cx, end, limits, indexed_ty) {
+ String::new()
+ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, take_expr) {
+ return;
+ } else {
+ match limits {
+ ast::RangeLimits::Closed => {
+ let take_expr = sugg::Sugg::hir(cx, take_expr, "<count>");
+ format!(".take({})", take_expr + sugg::ONE)
+ },
+ ast::RangeLimits::HalfOpen => {
+ format!(".take({})", snippet(cx, take_expr.span, ".."))
+ },
+ }
+ }
+ } else {
+ String::new()
+ };
+
+ let (ref_mut, method) = if visitor.indexed_mut.contains(&indexed) {
+ ("mut ", "iter_mut")
+ } else {
+ ("", "iter")
+ };
+
+ let take_is_empty = take.is_empty();
+ let mut method_1 = take;
+ let mut method_2 = skip;
+
+ if end_is_start_plus_val {
+ mem::swap(&mut method_1, &mut method_2);
+ }
+
+ if visitor.nonindex {
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is used to index `{indexed}`", ident.name),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![
+ (pat.span, format!("({}, <item>)", ident.name)),
+ (
+ arg.span,
+ format!("{indexed}.{method}().enumerate(){method_1}{method_2}"),
+ ),
+ ],
+ );
+ },
+ );
+ } else {
+ let repl = if starts_at_zero && take_is_empty {
+ format!("&{ref_mut}{indexed}")
+ } else {
+ format!("{indexed}.{method}(){method_1}{method_2}")
+ };
+
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is only used to index `{indexed}`", ident.name),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![(pat.span, "<item>".to_string()), (arg.span, repl)],
+ );
+ },
+ );
+ }
+ }
+ }
+ }
+}
+
+fn is_len_call(expr: &Expr<'_>, var: Symbol) -> bool {
+ if_chain! {
+ if let ExprKind::MethodCall(method, recv, [], _) = expr.kind;
+ if method.ident.name == sym::len;
+ if let ExprKind::Path(QPath::Resolved(_, path)) = recv.kind;
+ if path.segments.len() == 1;
+ if path.segments[0].ident.name == var;
+ then {
+ return true;
+ }
+ }
+
+ false
+}
+
+fn is_end_eq_array_len<'tcx>(
+ cx: &LateContext<'tcx>,
+ end: &Expr<'_>,
+ limits: ast::RangeLimits,
+ indexed_ty: Ty<'tcx>,
+) -> bool {
+ if_chain! {
+ if let ExprKind::Lit(ref lit) = end.kind;
+ if let ast::LitKind::Int(end_int, _) = lit.node;
+ if let ty::Array(_, arr_len_const) = indexed_ty.kind();
+ if let Some(arr_len) = arr_len_const.try_eval_usize(cx.tcx, cx.param_env);
+ then {
+ return match limits {
+ ast::RangeLimits::Closed => end_int + 1 >= arr_len.into(),
+ ast::RangeLimits::HalfOpen => end_int >= arr_len.into(),
+ };
+ }
+ }
+
+ false
+}
+
+struct VarVisitor<'a, 'tcx> {
+ /// context reference
+ cx: &'a LateContext<'tcx>,
+ /// var name to look for as index
+ var: HirId,
+ /// indexed variables that are used mutably
+ indexed_mut: FxHashSet<Symbol>,
+ /// indirectly indexed variables (`v[(i + 4) % N]`), the extend is `None` for global
+ indexed_indirectly: FxHashMap<Symbol, Option<region::Scope>>,
+ /// subset of `indexed` of vars that are indexed directly: `v[i]`
+ /// this will not contain cases like `v[calc_index(i)]` or `v[(i + 4) % N]`
+ indexed_directly: FxHashMap<Symbol, (Option<region::Scope>, Ty<'tcx>)>,
+ /// Any names that are used outside an index operation.
+ /// Used to detect things like `&mut vec` used together with `vec[i]`
+ referenced: FxHashSet<Symbol>,
+ /// has the loop variable been used in expressions other than the index of
+ /// an index op?
+ nonindex: bool,
+ /// Whether we are inside the `$` in `&mut $` or `$ = foo` or `$.bar`, where bar
+ /// takes `&mut self`
+ prefer_mutable: bool,
+}
+
+impl<'a, 'tcx> VarVisitor<'a, 'tcx> {
+ fn check(&mut self, idx: &'tcx Expr<'_>, seqexpr: &'tcx Expr<'_>, expr: &'tcx Expr<'_>) -> bool {
+ if_chain! {
+ // the indexed container is referenced by a name
+ if let ExprKind::Path(ref seqpath) = seqexpr.kind;
+ if let QPath::Resolved(None, seqvar) = *seqpath;
+ if seqvar.segments.len() == 1;
+ if is_local_used(self.cx, idx, self.var);
+ then {
+ if self.prefer_mutable {
+ self.indexed_mut.insert(seqvar.segments[0].ident.name);
+ }
+ let index_used_directly = matches!(idx.kind, ExprKind::Path(_));
+ let res = self.cx.qpath_res(seqpath, seqexpr.hir_id);
+ match res {
+ Res::Local(hir_id) => {
+ let parent_def_id = self.cx.tcx.hir().get_parent_item(expr.hir_id);
- self.indexed_indirectly.insert(seqvar.segments[0].ident.name, Some(extent));
++ let extent = self
++ .cx
+ .tcx
+ .region_scope_tree(parent_def_id)
+ .var_scope(hir_id.local_id)
+ .unwrap();
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (Some(extent), self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
- return false; // no need to walk further *on the variable*
- }
- Res::Def(DefKind::Static (_)| DefKind::Const, ..) => {
++ self.indexed_indirectly
++ .insert(seqvar.segments[0].ident.name, Some(extent));
+ }
- return false; // no need to walk further *on the variable*
- }
++ return false; // no need to walk further *on the variable*
++ },
++ Res::Def(DefKind::Static(_) | DefKind::Const, ..) => {
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (None, self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
+ self.indexed_indirectly.insert(seqvar.segments[0].ident.name, None);
+ }
- if (meth.ident.name == sym::index && match_trait_method(self.cx, expr, &paths::INDEX))
- || (meth.ident.name == sym::index_mut && match_trait_method(self.cx, expr, &paths::INDEX_MUT));
++ return false; // no need to walk further *on the variable*
++ },
+ _ => (),
+ }
+ }
+ }
+ true
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ // a range index op
+ if let ExprKind::MethodCall(meth, args_0, [args_1, ..], _) = &expr.kind;
- then { return }
++ if let Some(trait_id) = self
++ .cx
++ .typeck_results()
++ .type_dependent_def_id(expr.hir_id)
++ .and_then(|def_id| self.cx.tcx.trait_of_item(def_id));
++ if (meth.ident.name == sym::index && self.cx.tcx.lang_items().index_trait() == Some(trait_id))
++ || (meth.ident.name == sym::index_mut && self.cx.tcx.lang_items().index_mut_trait() == Some(trait_id));
+ if !self.check(args_1, args_0, expr);
- then { return }
++ then {
++ return;
++ }
+ }
+
+ if_chain! {
+ // an index op
+ if let ExprKind::Index(seqexpr, idx) = expr.kind;
+ if !self.check(idx, seqexpr, expr);
++ then {
++ return;
++ }
+ }
+
+ if_chain! {
+ // directly using a variable
+ if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind;
+ if let Res::Local(local_id) = path.res;
+ then {
+ if local_id == self.var {
+ self.nonindex = true;
+ } else {
+ // not the correct variable, but still a variable
+ self.referenced.insert(path.segments[0].ident.name);
+ }
+ }
+ }
+
+ let old = self.prefer_mutable;
+ match expr.kind {
+ ExprKind::AssignOp(_, lhs, rhs) | ExprKind::Assign(lhs, rhs, _) => {
+ self.prefer_mutable = true;
+ self.visit_expr(lhs);
+ self.prefer_mutable = false;
+ self.visit_expr(rhs);
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutbl, expr) => {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ self.visit_expr(expr);
+ },
+ ExprKind::Call(f, args) => {
+ self.visit_expr(f);
+ for expr in args {
+ let ty = self.cx.typeck_results().expr_ty_adjusted(expr);
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ let def_id = self.cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
+ for (ty, expr) in iter::zip(
+ self.cx.tcx.fn_sig(def_id).inputs().skip_binder(),
+ std::iter::once(receiver).chain(args.iter()),
+ ) {
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::Closure(&Closure { body, .. }) => {
+ let body = self.cx.tcx.hir().body(body);
+ self.visit_expr(body.value);
+ },
+ _ => walk_expr(self, expr),
+ }
+ self.prefer_mutable = old;
+ }
+}
--- /dev/null
- let local_id = match iter_expr.path {
- Res::Local(id) => id,
- _ => return true,
+use super::WHILE_LET_ON_ITERATOR;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::higher;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{
+ get_enclosing_loop_or_multi_call_closure, is_refutable, is_res_lang_ctor, is_trait_method, visitors::is_res_used,
+};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{def::Res, Closure, Expr, ExprKind, HirId, LangItem, Local, Mutability, PatKind, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::hir::nested_filter::OnlyBodies;
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_span::{symbol::sym, Symbol};
+
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ let (scrutinee_expr, iter_expr_struct, iter_expr, some_pat, loop_expr) = if_chain! {
+ if let Some(higher::WhileLet { if_then, let_pat, let_expr }) = higher::WhileLet::hir(expr);
+ // check for `Some(..)` pattern
+ if let PatKind::TupleStruct(ref pat_path, some_pat, _) = let_pat.kind;
+ if is_res_lang_ctor(cx, cx.qpath_res(pat_path, let_pat.hir_id), LangItem::OptionSome);
+ // check for call to `Iterator::next`
+ if let ExprKind::MethodCall(method_name, iter_expr, [], _) = let_expr.kind;
+ if method_name.ident.name == sym::next;
+ if is_trait_method(cx, let_expr, sym::Iterator);
+ if let Some(iter_expr_struct) = try_parse_iter_expr(cx, iter_expr);
+ // get the loop containing the match expression
+ if !uses_iter(cx, &iter_expr_struct, if_then);
+ then {
+ (let_expr, iter_expr_struct, iter_expr, some_pat, expr)
+ } else {
+ return;
+ }
+ };
+
+ let mut applicability = Applicability::MachineApplicable;
+ let loop_var = if let Some(some_pat) = some_pat.first() {
+ if is_refutable(cx, some_pat) {
+ // Refutable patterns don't work with for loops.
+ return;
+ }
+ snippet_with_applicability(cx, some_pat.span, "..", &mut applicability)
+ } else {
+ "_".into()
+ };
+
+ // If the iterator is a field or the iterator is accessed after the loop is complete it needs to be
+ // borrowed mutably. TODO: If the struct can be partially moved from and the struct isn't used
+ // afterwards a mutable borrow of a field isn't necessary.
+ let by_ref = if cx.typeck_results().expr_ty(iter_expr).ref_mutability() == Some(Mutability::Mut)
+ || !iter_expr_struct.can_move
+ || !iter_expr_struct.fields.is_empty()
+ || needs_mutable_borrow(cx, &iter_expr_struct, loop_expr)
+ {
+ ".by_ref()"
+ } else {
+ ""
+ };
+
+ let iterator = snippet_with_applicability(cx, iter_expr.span, "_", &mut applicability);
+ span_lint_and_sugg(
+ cx,
+ WHILE_LET_ON_ITERATOR,
+ expr.span.with_hi(scrutinee_expr.span.hi()),
+ "this loop could be written as a `for` loop",
+ "try",
+ format!("for {loop_var} in {iterator}{by_ref}"),
+ applicability,
+ );
+}
+
+#[derive(Debug)]
+struct IterExpr {
+ /// The fields used, in order of child to parent.
+ fields: Vec<Symbol>,
+ /// The path being used.
+ path: Res,
+ /// Whether or not the iterator can be moved.
+ can_move: bool,
+}
+
+/// Parses any expression to find out which field of which variable is used. Will return `None` if
+/// the expression might have side effects.
+fn try_parse_iter_expr(cx: &LateContext<'_>, mut e: &Expr<'_>) -> Option<IterExpr> {
+ let mut fields = Vec::new();
+ let mut can_move = true;
+ loop {
+ if cx
+ .typeck_results()
+ .expr_adjustments(e)
+ .iter()
+ .any(|a| matches!(a.kind, Adjust::Deref(Some(..))))
+ {
+ // Custom deref impls need to borrow the whole value as it's captured by reference
+ can_move = false;
+ fields.clear();
+ }
+ match e.kind {
+ ExprKind::Path(ref path) => {
+ break Some(IterExpr {
+ fields,
+ path: cx.qpath_res(path, e.hir_id),
+ can_move,
+ });
+ },
+ ExprKind::Field(base, name) => {
+ fields.push(name.name);
+ e = base;
+ },
+ // Dereferencing a pointer has no side effects and doesn't affect which field is being used.
+ ExprKind::Unary(UnOp::Deref, base) if cx.typeck_results().expr_ty(base).is_ref() => e = base,
+
+ // Shouldn't have side effects, but there's no way to trace which field is used. So forget which fields have
+ // already been seen.
+ ExprKind::Index(base, idx) if !idx.can_have_side_effects() => {
+ can_move = false;
+ fields.clear();
+ e = base;
+ },
+ ExprKind::Unary(UnOp::Deref, base) => {
+ can_move = false;
+ fields.clear();
+ e = base;
+ },
+
+ // No effect and doesn't affect which field is being used.
+ ExprKind::DropTemps(base) | ExprKind::AddrOf(_, _, base) | ExprKind::Type(base, _) => e = base,
+ _ => break None,
+ }
+ }
+}
+
+fn is_expr_same_field(cx: &LateContext<'_>, mut e: &Expr<'_>, mut fields: &[Symbol], path_res: Res) -> bool {
+ loop {
+ match (&e.kind, fields) {
+ (&ExprKind::Field(base, name), [head_field, tail_fields @ ..]) if name.name == *head_field => {
+ e = base;
+ fields = tail_fields;
+ },
+ (ExprKind::Path(path), []) => {
+ break cx.qpath_res(path, e.hir_id) == path_res;
+ },
+ (&(ExprKind::DropTemps(base) | ExprKind::AddrOf(_, _, base) | ExprKind::Type(base, _)), _) => e = base,
+ _ => break false,
+ }
+ }
+}
+
+/// Checks if the given expression is the same field as, is a child of, or is the parent of the
+/// given field. Used to check if the expression can be used while the given field is borrowed
+/// mutably. e.g. if checking for `x.y`, then `x.y`, `x.y.z`, and `x` will all return true, but
+/// `x.z`, and `y` will return false.
+fn is_expr_same_child_or_parent_field(cx: &LateContext<'_>, expr: &Expr<'_>, fields: &[Symbol], path_res: Res) -> bool {
+ match expr.kind {
+ ExprKind::Field(base, name) => {
+ if let Some((head_field, tail_fields)) = fields.split_first() {
+ if name.name == *head_field && is_expr_same_field(cx, base, tail_fields, path_res) {
+ return true;
+ }
+ // Check if the expression is a parent field
+ let mut fields_iter = tail_fields.iter();
+ while let Some(field) = fields_iter.next() {
+ if *field == name.name && is_expr_same_field(cx, base, fields_iter.as_slice(), path_res) {
+ return true;
+ }
+ }
+ }
+
+ // Check if the expression is a child field.
+ let mut e = base;
+ loop {
+ match e.kind {
+ ExprKind::Field(..) if is_expr_same_field(cx, e, fields, path_res) => break true,
+ ExprKind::Field(base, _) | ExprKind::DropTemps(base) | ExprKind::Type(base, _) => e = base,
+ ExprKind::Path(ref path) if fields.is_empty() => {
+ break cx.qpath_res(path, e.hir_id) == path_res;
+ },
+ _ => break false,
+ }
+ }
+ },
+ // If the path matches, this is either an exact match, or the expression is a parent of the field.
+ ExprKind::Path(ref path) => cx.qpath_res(path, expr.hir_id) == path_res,
+ ExprKind::DropTemps(base) | ExprKind::Type(base, _) | ExprKind::AddrOf(_, _, base) => {
+ is_expr_same_child_or_parent_field(cx, base, fields, path_res)
+ },
+ _ => false,
+ }
+}
+
+/// Strips off all field and path expressions. This will return true if a field or path has been
+/// skipped. Used to skip them after failing to check for equality.
+fn skip_fields_and_path<'tcx>(expr: &'tcx Expr<'_>) -> (Option<&'tcx Expr<'tcx>>, bool) {
+ let mut e = expr;
+ let e = loop {
+ match e.kind {
+ ExprKind::Field(base, _) | ExprKind::DropTemps(base) | ExprKind::Type(base, _) => e = base,
+ ExprKind::Path(_) => return (None, true),
+ _ => break e,
+ }
+ };
+ (Some(e), e.hir_id != expr.hir_id)
+}
+
+/// Checks if the given expression uses the iterator.
+fn uses_iter<'tcx>(cx: &LateContext<'tcx>, iter_expr: &IterExpr, container: &'tcx Expr<'_>) -> bool {
+ struct V<'a, 'b, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ iter_expr: &'b IterExpr,
+ uses_iter: bool,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, '_, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if self.uses_iter {
+ // return
+ } else if is_expr_same_child_or_parent_field(self.cx, e, &self.iter_expr.fields, self.iter_expr.path) {
+ self.uses_iter = true;
+ } else if let (e, true) = skip_fields_and_path(e) {
+ if let Some(e) = e {
+ self.visit_expr(e);
+ }
+ } else if let ExprKind::Closure(&Closure { body: id, .. }) = e.kind {
+ if is_res_used(self.cx, self.iter_expr.path, id) {
+ self.uses_iter = true;
+ }
+ } else {
+ walk_expr(self, e);
+ }
+ }
+ }
+
+ let mut v = V {
+ cx,
+ iter_expr,
+ uses_iter: false,
+ };
+ v.visit_expr(container);
+ v.uses_iter
+}
+
+#[expect(clippy::too_many_lines)]
+fn needs_mutable_borrow(cx: &LateContext<'_>, iter_expr: &IterExpr, loop_expr: &Expr<'_>) -> bool {
+ struct AfterLoopVisitor<'a, 'b, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ iter_expr: &'b IterExpr,
+ loop_id: HirId,
+ after_loop: bool,
+ used_iter: bool,
+ }
+ impl<'tcx> Visitor<'tcx> for AfterLoopVisitor<'_, '_, 'tcx> {
+ type NestedFilter = OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if self.used_iter {
+ return;
+ }
+ if self.after_loop {
+ if is_expr_same_child_or_parent_field(self.cx, e, &self.iter_expr.fields, self.iter_expr.path) {
+ self.used_iter = true;
+ } else if let (e, true) = skip_fields_and_path(e) {
+ if let Some(e) = e {
+ self.visit_expr(e);
+ }
+ } else if let ExprKind::Closure(&Closure { body: id, .. }) = e.kind {
+ self.used_iter = is_res_used(self.cx, self.iter_expr.path, id);
+ } else {
+ walk_expr(self, e);
+ }
+ } else if self.loop_id == e.hir_id {
+ self.after_loop = true;
+ } else {
+ walk_expr(self, e);
+ }
+ }
+ }
+
+ struct NestedLoopVisitor<'a, 'b, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ iter_expr: &'b IterExpr,
+ local_id: HirId,
+ loop_id: HirId,
+ after_loop: bool,
+ found_local: bool,
+ used_after: bool,
+ }
+ impl<'a, 'b, 'tcx> Visitor<'tcx> for NestedLoopVisitor<'a, 'b, 'tcx> {
+ type NestedFilter = OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_local(&mut self, l: &'tcx Local<'_>) {
+ if !self.after_loop {
+ l.pat.each_binding_or_first(&mut |_, id, _, _| {
+ if id == self.local_id {
+ self.found_local = true;
+ }
+ });
+ }
+ if let Some(e) = l.init {
+ self.visit_expr(e);
+ }
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if self.used_after {
+ return;
+ }
+ if self.after_loop {
+ if is_expr_same_child_or_parent_field(self.cx, e, &self.iter_expr.fields, self.iter_expr.path) {
+ self.used_after = true;
+ } else if let (e, true) = skip_fields_and_path(e) {
+ if let Some(e) = e {
+ self.visit_expr(e);
+ }
+ } else if let ExprKind::Closure(&Closure { body: id, .. }) = e.kind {
+ self.used_after = is_res_used(self.cx, self.iter_expr.path, id);
+ } else {
+ walk_expr(self, e);
+ }
+ } else if e.hir_id == self.loop_id {
+ self.after_loop = true;
+ } else {
+ walk_expr(self, e);
+ }
+ }
+ }
+
+ if let Some(e) = get_enclosing_loop_or_multi_call_closure(cx, loop_expr) {
++ let Res::Local(local_id) = iter_expr.path else {
++ return true
+ };
+ let mut v = NestedLoopVisitor {
+ cx,
+ iter_expr,
+ local_id,
+ loop_id: loop_expr.hir_id,
+ after_loop: false,
+ found_local: false,
+ used_after: false,
+ };
+ v.visit_expr(e);
+ v.used_after || !v.found_local
+ } else {
+ let mut v = AfterLoopVisitor {
+ cx,
+ iter_expr,
+ loop_id: loop_expr.hir_id,
+ after_loop: false,
+ used_iter: false,
+ };
+ v.visit_expr(cx.tcx.hir().body(cx.enclosing_body.unwrap()).value);
+ v.used_iter
+ }
+}
--- /dev/null
- use clippy_utils::match_function_call;
- use clippy_utils::paths::FUTURE_FROM_GENERATOR;
+use clippy_utils::diagnostics::span_lint_and_then;
- if let TypeBindingKind::Equality{term: Term::Ty(output)} = binding.kind;
++use clippy_utils::match_function_call_with_def_id;
+use clippy_utils::source::{position_before_rarrow, snippet_block, snippet_opt};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{
+ AsyncGeneratorKind, Block, Body, Closure, Expr, ExprKind, FnDecl, FnRetTy, GeneratorKind, GenericArg, GenericBound,
+ HirId, IsAsync, ItemKind, LifetimeName, Term, TraitRef, Ty, TyKind, TypeBindingKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// It checks for manual implementations of `async` functions.
+ ///
+ /// ### Why is this bad?
+ /// It's more idiomatic to use the dedicated syntax.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::future::Future;
+ ///
+ /// fn foo() -> impl Future<Output = i32> { async { 42 } }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// async fn foo() -> i32 { 42 }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MANUAL_ASYNC_FN,
+ style,
+ "manual implementations of `async` functions can be simplified using the dedicated syntax"
+}
+
+declare_lint_pass!(ManualAsyncFn => [MANUAL_ASYNC_FN]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ kind: FnKind<'tcx>,
+ decl: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ span: Span,
+ _: HirId,
+ ) {
+ if_chain! {
+ if let Some(header) = kind.header();
+ if header.asyncness == IsAsync::NotAsync;
+ // Check that this function returns `impl Future`
+ if let FnRetTy::Return(ret_ty) = decl.output;
+ if let Some((trait_ref, output_lifetimes)) = future_trait_ref(cx, ret_ty);
+ if let Some(output) = future_output_ty(trait_ref);
+ if captures_all_lifetimes(decl.inputs, &output_lifetimes);
+ // Check that the body of the function consists of one async block
+ if let ExprKind::Block(block, _) = body.value.kind;
+ if block.stmts.is_empty();
+ if let Some(closure_body) = desugared_async_block(cx, block);
+ then {
+ let header_span = span.with_hi(ret_ty.span.hi());
+
+ span_lint_and_then(
+ cx,
+ MANUAL_ASYNC_FN,
+ header_span,
+ "this function can be simplified using the `async fn` syntax",
+ |diag| {
+ if_chain! {
+ if let Some(header_snip) = snippet_opt(cx, header_span);
+ if let Some(ret_pos) = position_before_rarrow(&header_snip);
+ if let Some((ret_sugg, ret_snip)) = suggested_ret(cx, output);
+ then {
+ let help = format!("make the function `async` and {ret_sugg}");
+ diag.span_suggestion(
+ header_span,
+ &help,
+ format!("async {}{ret_snip}", &header_snip[..ret_pos]),
+ Applicability::MachineApplicable
+ );
+
+ let body_snip = snippet_block(cx, closure_body.value.span, "..", Some(block.span));
+ diag.span_suggestion(
+ block.span,
+ "move the body of the async block to the enclosing function",
+ body_snip,
+ Applicability::MachineApplicable
+ );
+ }
+ }
+ },
+ );
+ }
+ }
+ }
+}
+
+fn future_trait_ref<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: &'tcx Ty<'tcx>,
+) -> Option<(&'tcx TraitRef<'tcx>, Vec<LifetimeName>)> {
+ if_chain! {
+ if let TyKind::OpaqueDef(item_id, bounds, false) = ty.kind;
+ let item = cx.tcx.hir().item(item_id);
+ if let ItemKind::OpaqueTy(opaque) = &item.kind;
+ if let Some(trait_ref) = opaque.bounds.iter().find_map(|bound| {
+ if let GenericBound::Trait(poly, _) = bound {
+ Some(&poly.trait_ref)
+ } else {
+ None
+ }
+ });
+ if trait_ref.trait_def_id() == cx.tcx.lang_items().future_trait();
+ then {
+ let output_lifetimes = bounds
+ .iter()
+ .filter_map(|bound| {
+ if let GenericArg::Lifetime(lt) = bound {
+ Some(lt.name)
+ } else {
+ None
+ }
+ })
+ .collect();
+
+ return Some((trait_ref, output_lifetimes));
+ }
+ }
+
+ None
+}
+
+fn future_output_ty<'tcx>(trait_ref: &'tcx TraitRef<'tcx>) -> Option<&'tcx Ty<'tcx>> {
+ if_chain! {
+ if let Some(segment) = trait_ref.path.segments.last();
+ if let Some(args) = segment.args;
+ if args.bindings.len() == 1;
+ let binding = &args.bindings[0];
+ if binding.ident.name == sym::Output;
- return Some(output)
++ if let TypeBindingKind::Equality { term: Term::Ty(output) } = binding.kind;
+ then {
- if let Some(args) = match_function_call(cx, block_expr, &FUTURE_FROM_GENERATOR);
++ return Some(output);
+ }
+ }
+
+ None
+}
+
+fn captures_all_lifetimes(inputs: &[Ty<'_>], output_lifetimes: &[LifetimeName]) -> bool {
+ let input_lifetimes: Vec<LifetimeName> = inputs
+ .iter()
+ .filter_map(|ty| {
+ if let TyKind::Rptr(lt, _) = ty.kind {
+ Some(lt.name)
+ } else {
+ None
+ }
+ })
+ .collect();
+
+ // The lint should trigger in one of these cases:
+ // - There are no input lifetimes
+ // - There's only one output lifetime bound using `+ '_`
+ // - All input lifetimes are explicitly bound to the output
+ input_lifetimes.is_empty()
+ || (output_lifetimes.len() == 1 && matches!(output_lifetimes[0], LifetimeName::Infer))
+ || input_lifetimes
+ .iter()
+ .all(|in_lt| output_lifetimes.iter().any(|out_lt| in_lt == out_lt))
+}
+
+fn desugared_async_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) -> Option<&'tcx Body<'tcx>> {
+ if_chain! {
+ if let Some(block_expr) = block.expr;
- if let Expr{kind: ExprKind::Closure(&Closure { body, .. }), ..} = args[0];
++ if let Some(args) = cx
++ .tcx
++ .lang_items()
++ .from_generator_fn()
++ .and_then(|def_id| match_function_call_with_def_id(cx, block_expr, def_id));
+ if args.len() == 1;
++ if let Expr {
++ kind: ExprKind::Closure(&Closure { body, .. }),
++ ..
++ } = args[0];
+ let closure_body = cx.tcx.hir().body(body);
+ if closure_body.generator_kind == Some(GeneratorKind::Async(AsyncGeneratorKind::Block));
+ then {
+ return Some(closure_body);
+ }
+ }
+
+ None
+}
+
+fn suggested_ret(cx: &LateContext<'_>, output: &Ty<'_>) -> Option<(&'static str, String)> {
+ match output.kind {
+ TyKind::Tup(tys) if tys.is_empty() => {
+ let sugg = "remove the return type";
+ Some((sugg, String::new()))
+ },
+ _ => {
+ let sugg = "return the output of the future directly";
+ snippet_opt(cx, output.span).map(|snip| (sugg, format!(" -> {snip}")))
+ },
+ }
+}
--- /dev/null
- eq_expr_value, get_trait_def_id,
+use itertools::Itertools;
+use rustc_errors::Diagnostic;
+use rustc_hir::{
+ def::Res, Arm, BinOpKind, Block, Expr, ExprKind, Guard, HirId, PatKind, PathSegment, PrimTy, QPath, StmtKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::Ty;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{symbol::sym, Span};
+use std::ops::Deref;
+
+use clippy_utils::{
+ diagnostics::{span_lint_and_then, span_lint_hir_and_then},
- is_diag_trait_item, is_trait_method, meets_msrv, msrvs, path_res, path_to_local_id, paths, peel_blocks,
++ eq_expr_value,
+ higher::If,
- } else if get_trait_def_id(cx, &paths::ORD).map_or(false, |id| implements_trait(cx, ty, id, &[])) {
++ is_diag_trait_item, is_trait_method, meets_msrv, msrvs, path_res, path_to_local_id, peel_blocks,
+ peel_blocks_with_stmt,
+ sugg::Sugg,
+ ty::implements_trait,
+ visitors::is_const_evaluatable,
+ MaybePath,
+};
+use rustc_errors::Applicability;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Identifies good opportunities for a clamp function from std or core, and suggests using it.
+ ///
+ /// ### Why is this bad?
+ /// clamp is much shorter, easier to read, and doesn't use any control flow.
+ ///
+ /// ### Known issue(s)
+ /// If the clamped variable is NaN this suggestion will cause the code to propagate NaN
+ /// rather than returning either `max` or `min`.
+ ///
+ /// `clamp` functions will panic if `max < min`, `max.is_nan()`, or `min.is_nan()`.
+ /// Some may consider panicking in these situations to be desirable, but it also may
+ /// introduce panicking where there wasn't any before.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let (input, min, max) = (0, -2, 1);
+ /// if input > max {
+ /// max
+ /// } else if input < min {
+ /// min
+ /// } else {
+ /// input
+ /// }
+ /// # ;
+ /// ```
+ ///
+ /// ```rust
+ /// # let (input, min, max) = (0, -2, 1);
+ /// input.max(min).min(max)
+ /// # ;
+ /// ```
+ ///
+ /// ```rust
+ /// # let (input, min, max) = (0, -2, 1);
+ /// match input {
+ /// x if x > max => max,
+ /// x if x < min => min,
+ /// x => x,
+ /// }
+ /// # ;
+ /// ```
+ ///
+ /// ```rust
+ /// # let (input, min, max) = (0, -2, 1);
+ /// let mut x = input;
+ /// if x < min { x = min; }
+ /// if x > max { x = max; }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let (input, min, max) = (0, -2, 1);
+ /// input.clamp(min, max)
+ /// # ;
+ /// ```
+ #[clippy::version = "1.66.0"]
+ pub MANUAL_CLAMP,
+ complexity,
+ "using a clamp pattern instead of the clamp function"
+}
+impl_lint_pass!(ManualClamp => [MANUAL_CLAMP]);
+
+pub struct ManualClamp {
+ msrv: Option<RustcVersion>,
+}
+
+impl ManualClamp {
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+#[derive(Debug)]
+struct ClampSuggestion<'tcx> {
+ params: InputMinMax<'tcx>,
+ span: Span,
+ make_assignment: Option<&'tcx Expr<'tcx>>,
+ hir_with_ignore_attr: Option<HirId>,
+}
+
+#[derive(Debug)]
+struct InputMinMax<'tcx> {
+ input: &'tcx Expr<'tcx>,
+ min: &'tcx Expr<'tcx>,
+ max: &'tcx Expr<'tcx>,
+ is_float: bool,
+}
+
+impl<'tcx> LateLintPass<'tcx> for ManualClamp {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if !meets_msrv(self.msrv, msrvs::CLAMP) {
+ return;
+ }
+ if !expr.span.from_expansion() {
+ let suggestion = is_if_elseif_else_pattern(cx, expr)
+ .or_else(|| is_max_min_pattern(cx, expr))
+ .or_else(|| is_call_max_min_pattern(cx, expr))
+ .or_else(|| is_match_pattern(cx, expr))
+ .or_else(|| is_if_elseif_pattern(cx, expr));
+ if let Some(suggestion) = suggestion {
+ emit_suggestion(cx, &suggestion);
+ }
+ }
+ }
+
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) {
+ if !meets_msrv(self.msrv, msrvs::CLAMP) {
+ return;
+ }
+ for suggestion in is_two_if_pattern(cx, block) {
+ emit_suggestion(cx, &suggestion);
+ }
+ }
+ extract_msrv_attr!(LateContext);
+}
+
+fn emit_suggestion<'tcx>(cx: &LateContext<'tcx>, suggestion: &ClampSuggestion<'tcx>) {
+ let ClampSuggestion {
+ params: InputMinMax {
+ input,
+ min,
+ max,
+ is_float,
+ },
+ span,
+ make_assignment,
+ hir_with_ignore_attr,
+ } = suggestion;
+ let input = Sugg::hir(cx, input, "..").maybe_par();
+ let min = Sugg::hir(cx, min, "..");
+ let max = Sugg::hir(cx, max, "..");
+ let semicolon = if make_assignment.is_some() { ";" } else { "" };
+ let assignment = if let Some(assignment) = make_assignment {
+ let assignment = Sugg::hir(cx, assignment, "..");
+ format!("{assignment} = ")
+ } else {
+ String::new()
+ };
+ let suggestion = format!("{assignment}{input}.clamp({min}, {max}){semicolon}");
+ let msg = "clamp-like pattern without using clamp function";
+ let lint_builder = |d: &mut Diagnostic| {
+ d.span_suggestion(*span, "replace with clamp", suggestion, Applicability::MaybeIncorrect);
+ if *is_float {
+ d.note("clamp will panic if max < min, min.is_nan(), or max.is_nan()")
+ .note("clamp returns NaN if the input is NaN");
+ } else {
+ d.note("clamp will panic if max < min");
+ }
+ };
+ if let Some(hir_id) = hir_with_ignore_attr {
+ span_lint_hir_and_then(cx, MANUAL_CLAMP, *hir_id, *span, msg, lint_builder);
+ } else {
+ span_lint_and_then(cx, MANUAL_CLAMP, *span, msg, lint_builder);
+ }
+}
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+enum TypeClampability {
+ Float,
+ Ord,
+}
+
+impl TypeClampability {
+ fn is_clampable<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<TypeClampability> {
+ if ty.is_floating_point() {
+ Some(TypeClampability::Float)
++ } else if cx
++ .tcx
++ .get_diagnostic_item(sym::Ord)
++ .map_or(false, |id| implements_trait(cx, ty, id, &[]))
++ {
+ Some(TypeClampability::Ord)
+ } else {
+ None
+ }
+ }
+
+ fn is_float(self) -> bool {
+ matches!(self, TypeClampability::Float)
+ }
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (input, min, max) = (0, -3, 12);
+///
+/// if input < min {
+/// min
+/// } else if input > max {
+/// max
+/// } else {
+/// input
+/// }
+/// # ;
+/// ```
+fn is_if_elseif_else_pattern<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<ClampSuggestion<'tcx>> {
+ if let Some(If {
+ cond,
+ then,
+ r#else: Some(else_if),
+ }) = If::hir(expr)
+ && let Some(If {
+ cond: else_if_cond,
+ then: else_if_then,
+ r#else: Some(else_body),
+ }) = If::hir(peel_blocks(else_if))
+ {
+ let params = is_clamp_meta_pattern(
+ cx,
+ &BinaryOp::new(peel_blocks(cond))?,
+ &BinaryOp::new(peel_blocks(else_if_cond))?,
+ peel_blocks(then),
+ peel_blocks(else_if_then),
+ None,
+ )?;
+ // Contents of the else should be the resolved input.
+ if !eq_expr_value(cx, params.input, peel_blocks(else_body)) {
+ return None;
+ }
+ Some(ClampSuggestion {
+ params,
+ span: expr.span,
+ make_assignment: None,
+ hir_with_ignore_attr: None,
+ })
+ } else {
+ None
+ }
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (input, min_value, max_value) = (0, -3, 12);
+///
+/// input.max(min_value).min(max_value)
+/// # ;
+/// ```
+fn is_max_min_pattern<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<ClampSuggestion<'tcx>> {
+ if let ExprKind::MethodCall(seg_second, receiver, [arg_second], _) = &expr.kind
+ && (cx.typeck_results().expr_ty_adjusted(receiver).is_floating_point() || is_trait_method(cx, expr, sym::Ord))
+ && let ExprKind::MethodCall(seg_first, input, [arg_first], _) = &receiver.kind
+ && (cx.typeck_results().expr_ty_adjusted(input).is_floating_point() || is_trait_method(cx, receiver, sym::Ord))
+ {
+ let is_float = cx.typeck_results().expr_ty_adjusted(input).is_floating_point();
+ let (min, max) = match (seg_first.ident.as_str(), seg_second.ident.as_str()) {
+ ("min", "max") => (arg_second, arg_first),
+ ("max", "min") => (arg_first, arg_second),
+ _ => return None,
+ };
+ Some(ClampSuggestion {
+ params: InputMinMax { input, min, max, is_float },
+ span: expr.span,
+ make_assignment: None,
+ hir_with_ignore_attr: None,
+ })
+ } else {
+ None
+ }
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (input, min_value, max_value) = (0, -3, 12);
+/// # use std::cmp::{max, min};
+/// min(max(input, min_value), max_value)
+/// # ;
+/// ```
+fn is_call_max_min_pattern<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<ClampSuggestion<'tcx>> {
+ fn segment<'tcx>(cx: &LateContext<'_>, func: &Expr<'tcx>) -> Option<FunctionType<'tcx>> {
+ match func.kind {
+ ExprKind::Path(QPath::Resolved(None, path)) => {
+ let id = path.res.opt_def_id()?;
+ match cx.tcx.get_diagnostic_name(id) {
+ Some(sym::cmp_min) => Some(FunctionType::CmpMin),
+ Some(sym::cmp_max) => Some(FunctionType::CmpMax),
+ _ if is_diag_trait_item(cx, id, sym::Ord) => {
+ Some(FunctionType::OrdOrFloat(path.segments.last().expect("infallible")))
+ },
+ _ => None,
+ }
+ },
+ ExprKind::Path(QPath::TypeRelative(ty, seg)) => {
+ matches!(path_res(cx, ty), Res::PrimTy(PrimTy::Float(_))).then(|| FunctionType::OrdOrFloat(seg))
+ },
+ _ => None,
+ }
+ }
+
+ enum FunctionType<'tcx> {
+ CmpMin,
+ CmpMax,
+ OrdOrFloat(&'tcx PathSegment<'tcx>),
+ }
+
+ fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ outer_fn: &'tcx Expr<'tcx>,
+ inner_call: &'tcx Expr<'tcx>,
+ outer_arg: &'tcx Expr<'tcx>,
+ span: Span,
+ ) -> Option<ClampSuggestion<'tcx>> {
+ if let ExprKind::Call(inner_fn, [first, second]) = &inner_call.kind
+ && let Some(inner_seg) = segment(cx, inner_fn)
+ && let Some(outer_seg) = segment(cx, outer_fn)
+ {
+ let (input, inner_arg) = match (is_const_evaluatable(cx, first), is_const_evaluatable(cx, second)) {
+ (true, false) => (second, first),
+ (false, true) => (first, second),
+ _ => return None,
+ };
+ let is_float = cx.typeck_results().expr_ty_adjusted(input).is_floating_point();
+ let (min, max) = match (inner_seg, outer_seg) {
+ (FunctionType::CmpMin, FunctionType::CmpMax) => (outer_arg, inner_arg),
+ (FunctionType::CmpMax, FunctionType::CmpMin) => (inner_arg, outer_arg),
+ (FunctionType::OrdOrFloat(first_segment), FunctionType::OrdOrFloat(second_segment)) => {
+ match (first_segment.ident.as_str(), second_segment.ident.as_str()) {
+ ("min", "max") => (outer_arg, inner_arg),
+ ("max", "min") => (inner_arg, outer_arg),
+ _ => return None,
+ }
+ }
+ _ => return None,
+ };
+ Some(ClampSuggestion {
+ params: InputMinMax { input, min, max, is_float },
+ span,
+ make_assignment: None,
+ hir_with_ignore_attr: None,
+ })
+ } else {
+ None
+ }
+ }
+
+ if let ExprKind::Call(outer_fn, [first, second]) = &expr.kind {
+ check(cx, outer_fn, first, second, expr.span).or_else(|| check(cx, outer_fn, second, first, expr.span))
+ } else {
+ None
+ }
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (input, min, max) = (0, -3, 12);
+///
+/// match input {
+/// input if input > max => max,
+/// input if input < min => min,
+/// input => input,
+/// }
+/// # ;
+/// ```
+fn is_match_pattern<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<ClampSuggestion<'tcx>> {
+ if let ExprKind::Match(value, [first_arm, second_arm, last_arm], rustc_hir::MatchSource::Normal) = &expr.kind {
+ // Find possible min/max branches
+ let minmax_values = |a: &'tcx Arm<'tcx>| {
+ if let PatKind::Binding(_, var_hir_id, _, None) = &a.pat.kind
+ && let Some(Guard::If(e)) = a.guard {
+ Some((e, var_hir_id, a.body))
+ } else {
+ None
+ }
+ };
+ let (first, first_hir_id, first_expr) = minmax_values(first_arm)?;
+ let (second, second_hir_id, second_expr) = minmax_values(second_arm)?;
+ let first = BinaryOp::new(first)?;
+ let second = BinaryOp::new(second)?;
+ if let PatKind::Binding(_, binding, _, None) = &last_arm.pat.kind
+ && path_to_local_id(peel_blocks_with_stmt(last_arm.body), *binding)
+ && last_arm.guard.is_none()
+ {
+ // Proceed as normal
+ } else {
+ return None;
+ }
+ if let Some(params) = is_clamp_meta_pattern(
+ cx,
+ &first,
+ &second,
+ first_expr,
+ second_expr,
+ Some((*first_hir_id, *second_hir_id)),
+ ) {
+ return Some(ClampSuggestion {
+ params: InputMinMax {
+ input: value,
+ min: params.min,
+ max: params.max,
+ is_float: params.is_float,
+ },
+ span: expr.span,
+ make_assignment: None,
+ hir_with_ignore_attr: None,
+ });
+ }
+ }
+ None
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (input, min, max) = (0, -3, 12);
+///
+/// let mut x = input;
+/// if x < min { x = min; }
+/// if x > max { x = max; }
+/// ```
+fn is_two_if_pattern<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) -> Vec<ClampSuggestion<'tcx>> {
+ block_stmt_with_last(block)
+ .tuple_windows()
+ .filter_map(|(maybe_set_first, maybe_set_second)| {
+ if let StmtKind::Expr(first_expr) = *maybe_set_first
+ && let StmtKind::Expr(second_expr) = *maybe_set_second
+ && let Some(If { cond: first_cond, then: first_then, r#else: None }) = If::hir(first_expr)
+ && let Some(If { cond: second_cond, then: second_then, r#else: None }) = If::hir(second_expr)
+ && let ExprKind::Assign(
+ maybe_input_first_path,
+ maybe_min_max_first,
+ _
+ ) = peel_blocks_with_stmt(first_then).kind
+ && let ExprKind::Assign(
+ maybe_input_second_path,
+ maybe_min_max_second,
+ _
+ ) = peel_blocks_with_stmt(second_then).kind
+ && eq_expr_value(cx, maybe_input_first_path, maybe_input_second_path)
+ && let Some(first_bin) = BinaryOp::new(first_cond)
+ && let Some(second_bin) = BinaryOp::new(second_cond)
+ && let Some(input_min_max) = is_clamp_meta_pattern(
+ cx,
+ &first_bin,
+ &second_bin,
+ maybe_min_max_first,
+ maybe_min_max_second,
+ None
+ )
+ {
+ Some(ClampSuggestion {
+ params: InputMinMax {
+ input: maybe_input_first_path,
+ min: input_min_max.min,
+ max: input_min_max.max,
+ is_float: input_min_max.is_float,
+ },
+ span: first_expr.span.to(second_expr.span),
+ make_assignment: Some(maybe_input_first_path),
+ hir_with_ignore_attr: Some(first_expr.hir_id()),
+ })
+ } else {
+ None
+ }
+ })
+ .collect()
+}
+
+/// Targets patterns like
+///
+/// ```
+/// # let (mut input, min, max) = (0, -3, 12);
+///
+/// if input < min {
+/// input = min;
+/// } else if input > max {
+/// input = max;
+/// }
+/// ```
+fn is_if_elseif_pattern<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<ClampSuggestion<'tcx>> {
+ if let Some(If {
+ cond,
+ then,
+ r#else: Some(else_if),
+ }) = If::hir(expr)
+ && let Some(If {
+ cond: else_if_cond,
+ then: else_if_then,
+ r#else: None,
+ }) = If::hir(peel_blocks(else_if))
+ && let ExprKind::Assign(
+ maybe_input_first_path,
+ maybe_min_max_first,
+ _
+ ) = peel_blocks_with_stmt(then).kind
+ && let ExprKind::Assign(
+ maybe_input_second_path,
+ maybe_min_max_second,
+ _
+ ) = peel_blocks_with_stmt(else_if_then).kind
+ {
+ let params = is_clamp_meta_pattern(
+ cx,
+ &BinaryOp::new(peel_blocks(cond))?,
+ &BinaryOp::new(peel_blocks(else_if_cond))?,
+ peel_blocks(maybe_min_max_first),
+ peel_blocks(maybe_min_max_second),
+ None,
+ )?;
+ if !eq_expr_value(cx, maybe_input_first_path, maybe_input_second_path) {
+ return None;
+ }
+ Some(ClampSuggestion {
+ params,
+ span: expr.span,
+ make_assignment: Some(maybe_input_first_path),
+ hir_with_ignore_attr: None,
+ })
+ } else {
+ None
+ }
+}
+
+/// `ExprKind::Binary` but more narrowly typed
+#[derive(Debug, Clone, Copy)]
+struct BinaryOp<'tcx> {
+ op: BinOpKind,
+ left: &'tcx Expr<'tcx>,
+ right: &'tcx Expr<'tcx>,
+}
+
+impl<'tcx> BinaryOp<'tcx> {
+ fn new(e: &'tcx Expr<'tcx>) -> Option<BinaryOp<'tcx>> {
+ match &e.kind {
+ ExprKind::Binary(op, left, right) => Some(BinaryOp {
+ op: op.node,
+ left,
+ right,
+ }),
+ _ => None,
+ }
+ }
+
+ fn flip(&self) -> Self {
+ Self {
+ op: match self.op {
+ BinOpKind::Le => BinOpKind::Ge,
+ BinOpKind::Lt => BinOpKind::Gt,
+ BinOpKind::Ge => BinOpKind::Le,
+ BinOpKind::Gt => BinOpKind::Lt,
+ other => other,
+ },
+ left: self.right,
+ right: self.left,
+ }
+ }
+}
+
+/// The clamp meta pattern is a pattern shared between many (but not all) patterns.
+/// In summary, this pattern consists of two if statements that meet many criteria,
+/// - binary operators that are one of [`>`, `<`, `>=`, `<=`].
+/// - Both binary statements must have a shared argument
+/// - Which can appear on the left or right side of either statement
+/// - The binary operators must define a finite range for the shared argument. To put this in
+/// the terms of Rust `std` library, the following ranges are acceptable
+/// - `Range`
+/// - `RangeInclusive`
+/// And all other range types are not accepted. For the purposes of `clamp` it's irrelevant
+/// whether the range is inclusive or not, the output is the same.
+/// - The result of each if statement must be equal to the argument unique to that if statement. The
+/// result can not be the shared argument in either case.
+fn is_clamp_meta_pattern<'tcx>(
+ cx: &LateContext<'tcx>,
+ first_bin: &BinaryOp<'tcx>,
+ second_bin: &BinaryOp<'tcx>,
+ first_expr: &'tcx Expr<'tcx>,
+ second_expr: &'tcx Expr<'tcx>,
+ // This parameters is exclusively for the match pattern.
+ // It exists because the variable bindings used in that pattern
+ // refer to the variable bound in the match arm, not the variable
+ // bound outside of it. Fortunately due to context we know this has to
+ // be the input variable, not the min or max.
+ input_hir_ids: Option<(HirId, HirId)>,
+) -> Option<InputMinMax<'tcx>> {
+ fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ first_bin: &BinaryOp<'tcx>,
+ second_bin: &BinaryOp<'tcx>,
+ first_expr: &'tcx Expr<'tcx>,
+ second_expr: &'tcx Expr<'tcx>,
+ input_hir_ids: Option<(HirId, HirId)>,
+ is_float: bool,
+ ) -> Option<InputMinMax<'tcx>> {
+ match (&first_bin.op, &second_bin.op) {
+ (BinOpKind::Ge | BinOpKind::Gt, BinOpKind::Le | BinOpKind::Lt) => {
+ let (min, max) = (second_expr, first_expr);
+ let refers_to_input = match input_hir_ids {
+ Some((first_hir_id, second_hir_id)) => {
+ path_to_local_id(peel_blocks(first_bin.left), first_hir_id)
+ && path_to_local_id(peel_blocks(second_bin.left), second_hir_id)
+ },
+ None => eq_expr_value(cx, first_bin.left, second_bin.left),
+ };
+ (refers_to_input
+ && eq_expr_value(cx, first_bin.right, first_expr)
+ && eq_expr_value(cx, second_bin.right, second_expr))
+ .then_some(InputMinMax {
+ input: first_bin.left,
+ min,
+ max,
+ is_float,
+ })
+ },
+ _ => None,
+ }
+ }
+ // First filter out any expressions with side effects
+ let exprs = [
+ first_bin.left,
+ first_bin.right,
+ second_bin.left,
+ second_bin.right,
+ first_expr,
+ second_expr,
+ ];
+ let clampability = TypeClampability::is_clampable(cx, cx.typeck_results().expr_ty(first_expr))?;
+ let is_float = clampability.is_float();
+ if exprs.iter().any(|e| peel_blocks(e).can_have_side_effects()) {
+ return None;
+ }
+ if !(is_ord_op(first_bin.op) && is_ord_op(second_bin.op)) {
+ return None;
+ }
+ let cases = [
+ (*first_bin, *second_bin),
+ (first_bin.flip(), second_bin.flip()),
+ (first_bin.flip(), *second_bin),
+ (*first_bin, second_bin.flip()),
+ ];
+
+ cases.into_iter().find_map(|(first, second)| {
+ check(cx, &first, &second, first_expr, second_expr, input_hir_ids, is_float).or_else(|| {
+ check(
+ cx,
+ &second,
+ &first,
+ second_expr,
+ first_expr,
+ input_hir_ids.map(|(l, r)| (r, l)),
+ is_float,
+ )
+ })
+ })
+}
+
+fn block_stmt_with_last<'tcx>(block: &'tcx Block<'tcx>) -> impl Iterator<Item = MaybeBorrowedStmtKind<'tcx>> {
+ block
+ .stmts
+ .iter()
+ .map(|s| MaybeBorrowedStmtKind::Borrowed(&s.kind))
+ .chain(
+ block
+ .expr
+ .as_ref()
+ .map(|e| MaybeBorrowedStmtKind::Owned(StmtKind::Expr(e))),
+ )
+}
+
+fn is_ord_op(op: BinOpKind) -> bool {
+ matches!(op, BinOpKind::Ge | BinOpKind::Gt | BinOpKind::Le | BinOpKind::Lt)
+}
+
+/// Really similar to Cow, but doesn't have a `Clone` requirement.
+#[derive(Debug)]
+enum MaybeBorrowedStmtKind<'a> {
+ Borrowed(&'a StmtKind<'a>),
+ Owned(StmtKind<'a>),
+}
+
+impl<'a> Clone for MaybeBorrowedStmtKind<'a> {
+ fn clone(&self) -> Self {
+ match self {
+ Self::Borrowed(t) => Self::Borrowed(t),
+ Self::Owned(StmtKind::Expr(e)) => Self::Owned(StmtKind::Expr(e)),
+ Self::Owned(_) => unreachable!("Owned should only ever contain a StmtKind::Expr."),
+ }
+ }
+}
+
+impl<'a> Deref for MaybeBorrowedStmtKind<'a> {
+ type Target = StmtKind<'a>;
+
+ fn deref(&self) -> &Self::Target {
+ match self {
+ Self::Borrowed(t) => t,
+ Self::Owned(t) => t,
+ }
+ }
+}
--- /dev/null
- if let Some(binding_span) = find_pat_binding(outer_pat, binding_id);
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::higher::IfLetOrMatch;
++use clippy_utils::source::snippet;
+use clippy_utils::visitors::is_local_used;
+use clippy_utils::{
+ is_res_lang_ctor, is_unit_expr, path_to_local, peel_blocks_with_stmt, peel_ref_operators, SpanlessEq,
+};
+use if_chain::if_chain;
+use rustc_errors::MultiSpan;
+use rustc_hir::LangItem::OptionNone;
+use rustc_hir::{Arm, Expr, Guard, HirId, Let, Pat, PatKind};
+use rustc_lint::LateContext;
+use rustc_span::Span;
+
+use super::COLLAPSIBLE_MATCH;
+
+pub(super) fn check_match<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>]) {
+ if let Some(els_arm) = arms.iter().rfind(|arm| arm_is_wild_like(cx, arm)) {
+ for arm in arms {
+ check_arm(cx, true, arm.pat, arm.body, arm.guard.as_ref(), Some(els_arm.body));
+ }
+ }
+}
+
+pub(super) fn check_if_let<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ body: &'tcx Expr<'_>,
+ else_expr: Option<&'tcx Expr<'_>>,
+) {
+ check_arm(cx, false, pat, body, None, else_expr);
+}
+
+fn check_arm<'tcx>(
+ cx: &LateContext<'tcx>,
+ outer_is_match: bool,
+ outer_pat: &'tcx Pat<'tcx>,
+ outer_then_body: &'tcx Expr<'tcx>,
+ outer_guard: Option<&'tcx Guard<'tcx>>,
+ outer_else_body: Option<&'tcx Expr<'tcx>>,
+) {
+ let inner_expr = peel_blocks_with_stmt(outer_then_body);
+ if_chain! {
+ if let Some(inner) = IfLetOrMatch::parse(cx, inner_expr);
+ if let Some((inner_scrutinee, inner_then_pat, inner_else_body)) = match inner {
+ IfLetOrMatch::IfLet(scrutinee, pat, _, els) => Some((scrutinee, pat, els)),
+ IfLetOrMatch::Match(scrutinee, arms, ..) => if_chain! {
+ // if there are more than two arms, collapsing would be non-trivial
+ if arms.len() == 2 && arms.iter().all(|a| a.guard.is_none());
+ // one of the arms must be "wild-like"
+ if let Some(wild_idx) = arms.iter().rposition(|a| arm_is_wild_like(cx, a));
+ then {
+ let (then, els) = (&arms[1 - wild_idx], &arms[wild_idx]);
+ Some((scrutinee, then.pat, Some(els.body)))
+ } else {
+ None
+ }
+ },
+ };
+ if outer_pat.span.ctxt() == inner_scrutinee.span.ctxt();
+ // match expression must be a local binding
+ // match <local> { .. }
+ if let Some(binding_id) = path_to_local(peel_ref_operators(cx, inner_scrutinee));
+ if !pat_contains_or(inner_then_pat);
+ // the binding must come from the pattern of the containing match arm
+ // ..<local>.. => match <local> { .. }
- help_span.push_span_label(inner_then_pat.span, "with this pattern");
++ if let (Some(binding_span), is_innermost_parent_pat_struct)
++ = find_pat_binding_and_is_innermost_parent_pat_struct(outer_pat, binding_id);
+ // the "else" branches must be equal
+ if match (outer_else_body, inner_else_body) {
+ (None, None) => true,
+ (None, Some(e)) | (Some(e), None) => is_unit_expr(e),
+ (Some(a), Some(b)) => SpanlessEq::new(cx).eq_expr(a, b),
+ };
+ // the binding must not be used in the if guard
+ if outer_guard.map_or(
+ true,
+ |(Guard::If(e) | Guard::IfLet(Let { init: e, .. }))| !is_local_used(cx, *e, binding_id)
+ );
+ // ...or anywhere in the inner expression
+ if match inner {
+ IfLetOrMatch::IfLet(_, _, body, els) => {
+ !is_local_used(cx, body, binding_id) && els.map_or(true, |e| !is_local_used(cx, e, binding_id))
+ },
+ IfLetOrMatch::Match(_, arms, ..) => !arms.iter().any(|arm| is_local_used(cx, arm, binding_id)),
+ };
+ then {
+ let msg = format!(
+ "this `{}` can be collapsed into the outer `{}`",
+ if matches!(inner, IfLetOrMatch::Match(..)) { "match" } else { "if let" },
+ if outer_is_match { "match" } else { "if let" },
+ );
++ // collapsing patterns need an explicit field name in struct pattern matching
++ // ex: Struct {x: Some(1)}
++ let replace_msg = if is_innermost_parent_pat_struct {
++ format!(", prefixed by {}:", snippet(cx, binding_span, "their field name"))
++ } else {
++ String::new()
++ };
+ span_lint_and_then(
+ cx,
+ COLLAPSIBLE_MATCH,
+ inner_expr.span,
+ &msg,
+ |diag| {
+ let mut help_span = MultiSpan::from_spans(vec![binding_span, inner_then_pat.span]);
+ help_span.push_span_label(binding_span, "replace this binding");
- fn find_pat_binding(pat: &Pat<'_>, hir_id: HirId) -> Option<Span> {
++ help_span.push_span_label(inner_then_pat.span, format!("with this pattern{replace_msg}"));
+ diag.span_help(help_span, "the outer pattern can be modified to include the inner pattern");
+ },
+ );
+ }
+ }
+}
+
+/// A "wild-like" arm has a wild (`_`) or `None` pattern and no guard. Such arms can be "collapsed"
+/// into a single wild arm without any significant loss in semantics or readability.
+fn arm_is_wild_like(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ if arm.guard.is_some() {
+ return false;
+ }
+ match arm.pat.kind {
+ PatKind::Binding(..) | PatKind::Wild => true,
+ PatKind::Path(ref qpath) => is_res_lang_ctor(cx, cx.qpath_res(qpath, arm.pat.hir_id), OptionNone),
+ _ => false,
+ }
+}
+
- _ => true,
++fn find_pat_binding_and_is_innermost_parent_pat_struct(pat: &Pat<'_>, hir_id: HirId) -> (Option<Span>, bool) {
+ let mut span = None;
++ let mut is_innermost_parent_pat_struct = false;
+ pat.walk_short(|p| match &p.kind {
+ // ignore OR patterns
+ PatKind::Or(_) => false,
+ PatKind::Binding(_bm, _, _ident, _) => {
+ let found = p.hir_id == hir_id;
+ if found {
+ span = Some(p.span);
+ }
+ !found
+ },
- span
++ _ => {
++ is_innermost_parent_pat_struct = matches!(p.kind, PatKind::Struct(..));
++ true
++ },
+ });
++ (span, is_innermost_parent_pat_struct)
+}
+
+fn pat_contains_or(pat: &Pat<'_>) -> bool {
+ let mut result = false;
+ pat.walk(|p| {
+ let is_or = matches!(p.kind, PatKind::Or(_));
+ result |= is_or;
+ !is_or
+ });
+ result
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::ty::is_type_diagnostic_item;
++use clippy_utils::visitors::contains_unsafe_block;
++use clippy_utils::{is_res_lang_ctor, path_res, path_to_local_id};
++
++use rustc_hir::LangItem::OptionSome;
++use rustc_hir::{Arm, Expr, ExprKind, HirId, Pat, PatKind};
++use rustc_lint::LateContext;
++use rustc_span::{sym, SyntaxContext};
++
++use super::manual_utils::{check_with, SomeExpr};
++use super::MANUAL_FILTER;
++
++// Function called on the <expr> of `[&+]Some((ref | ref mut) x) => <expr>`
++// Need to check if it's of the form `<expr>=if <cond> {<then_expr>} else {<else_expr>}`
++// AND that only one `then/else_expr` resolves to `Some(x)` while the other resolves to `None`
++// return the `cond` expression if so.
++fn get_cond_expr<'tcx>(
++ cx: &LateContext<'tcx>,
++ pat: &Pat<'_>,
++ expr: &'tcx Expr<'_>,
++ ctxt: SyntaxContext,
++) -> Option<SomeExpr<'tcx>> {
++ if_chain! {
++ if let Some(block_expr) = peels_blocks_incl_unsafe_opt(expr);
++ if let ExprKind::If(cond, then_expr, Some(else_expr)) = block_expr.kind;
++ if let PatKind::Binding(_,target, ..) = pat.kind;
++ if let (then_visitor, else_visitor)
++ = (is_some_expr(cx, target, ctxt, then_expr),
++ is_some_expr(cx, target, ctxt, else_expr));
++ if then_visitor != else_visitor; // check that one expr resolves to `Some(x)`, the other to `None`
++ then {
++ return Some(SomeExpr {
++ expr: peels_blocks_incl_unsafe(cond.peel_drop_temps()),
++ needs_unsafe_block: contains_unsafe_block(cx, expr),
++ needs_negated: !then_visitor // if the `then_expr` resolves to `None`, need to negate the cond
++ })
++ }
++ };
++ None
++}
++
++fn peels_blocks_incl_unsafe_opt<'a>(expr: &'a Expr<'a>) -> Option<&'a Expr<'a>> {
++ // we don't want to use `peel_blocks` here because we don't care if the block is unsafe, it's
++ // checked by `contains_unsafe_block`
++ if let ExprKind::Block(block, None) = expr.kind {
++ if block.stmts.is_empty() {
++ return block.expr;
++ }
++ };
++ None
++}
++
++fn peels_blocks_incl_unsafe<'a>(expr: &'a Expr<'a>) -> &'a Expr<'a> {
++ peels_blocks_incl_unsafe_opt(expr).unwrap_or(expr)
++}
++
++// function called for each <expr> expression:
++// Some(x) => if <cond> {
++// <expr>
++// } else {
++// <expr>
++// }
++// Returns true if <expr> resolves to `Some(x)`, `false` otherwise
++fn is_some_expr<'tcx>(cx: &LateContext<'_>, target: HirId, ctxt: SyntaxContext, expr: &'tcx Expr<'_>) -> bool {
++ if let Some(inner_expr) = peels_blocks_incl_unsafe_opt(expr) {
++ // there can be not statements in the block as they would be removed when switching to `.filter`
++ if let ExprKind::Call(callee, [arg]) = inner_expr.kind {
++ return ctxt == expr.span.ctxt()
++ && is_res_lang_ctor(cx, path_res(cx, callee), OptionSome)
++ && path_to_local_id(arg, target);
++ }
++ };
++ false
++}
++
++// given the closure: `|<pattern>| <expr>`
++// returns `|&<pattern>| <expr>`
++fn add_ampersand_if_copy(body_str: String, has_copy_trait: bool) -> String {
++ if has_copy_trait {
++ let mut with_ampersand = body_str;
++ with_ampersand.insert(1, '&');
++ with_ampersand
++ } else {
++ body_str
++ }
++}
++
++pub(super) fn check_match<'tcx>(
++ cx: &LateContext<'tcx>,
++ scrutinee: &'tcx Expr<'_>,
++ arms: &'tcx [Arm<'_>],
++ expr: &'tcx Expr<'_>,
++) {
++ let ty = cx.typeck_results().expr_ty(expr);
++ if is_type_diagnostic_item(cx, ty, sym::Option)
++ && let [first_arm, second_arm] = arms
++ && first_arm.guard.is_none()
++ && second_arm.guard.is_none()
++ {
++ check(cx, expr, scrutinee, first_arm.pat, first_arm.body, Some(second_arm.pat), second_arm.body);
++ }
++}
++
++pub(super) fn check_if_let<'tcx>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx Expr<'_>,
++ let_pat: &'tcx Pat<'_>,
++ let_expr: &'tcx Expr<'_>,
++ then_expr: &'tcx Expr<'_>,
++ else_expr: &'tcx Expr<'_>,
++) {
++ check(cx, expr, let_expr, let_pat, then_expr, None, else_expr);
++}
++
++fn check<'tcx>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx Expr<'_>,
++ scrutinee: &'tcx Expr<'_>,
++ then_pat: &'tcx Pat<'_>,
++ then_body: &'tcx Expr<'_>,
++ else_pat: Option<&'tcx Pat<'_>>,
++ else_body: &'tcx Expr<'_>,
++) {
++ if let Some(sugg_info) = check_with(
++ cx,
++ expr,
++ scrutinee,
++ then_pat,
++ then_body,
++ else_pat,
++ else_body,
++ get_cond_expr,
++ ) {
++ let body_str = add_ampersand_if_copy(sugg_info.body_str, sugg_info.scrutinee_impl_copy);
++ span_lint_and_sugg(
++ cx,
++ MANUAL_FILTER,
++ expr.span,
++ "manual implementation of `Option::filter`",
++ "try this",
++ if sugg_info.needs_brackets {
++ format!(
++ "{{ {}{}.filter({body_str}) }}",
++ sugg_info.scrutinee_str, sugg_info.as_ref_str
++ )
++ } else {
++ format!("{}{}.filter({body_str})", sugg_info.scrutinee_str, sugg_info.as_ref_str)
++ },
++ sugg_info.app,
++ );
++ }
++}
--- /dev/null
- use crate::{map_unit_fn::OPTION_MAP_UNIT_FN, matches::MATCH_AS_REF};
++use super::manual_utils::{check_with, SomeExpr};
++use super::MANUAL_MAP;
+use clippy_utils::diagnostics::span_lint_and_sugg;
- use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
- use clippy_utils::ty::{is_type_diagnostic_item, peel_mid_ty_refs_is_mutable, type_is_unsafe_function};
- use clippy_utils::{
- can_move_expr_to_closure, is_else_clause, is_lint_allowed, is_res_lang_ctor, path_res, path_to_local_id,
- peel_blocks, peel_hir_expr_refs, peel_hir_expr_while, CaptureKind,
- };
- use rustc_ast::util::parser::PREC_POSTFIX;
- use rustc_errors::Applicability;
- use rustc_hir::LangItem::{OptionNone, OptionSome};
- use rustc_hir::{
- def::Res, Arm, BindingAnnotation, Block, BlockCheckMode, Expr, ExprKind, HirId, Mutability, Pat, PatKind, Path,
- QPath, UnsafeSource,
- };
- use rustc_lint::LateContext;
- use rustc_span::{sym, SyntaxContext};
+
- use super::MANUAL_MAP;
++use clippy_utils::{is_res_lang_ctor, path_res};
++
++use rustc_hir::LangItem::OptionSome;
++use rustc_hir::{Arm, Block, BlockCheckMode, Expr, ExprKind, Pat, UnsafeSource};
++use rustc_lint::LateContext;
++use rustc_span::SyntaxContext;
+
+pub(super) fn check_match<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ scrutinee: &'tcx Expr<'_>,
+ arms: &'tcx [Arm<'_>],
+) {
+ if let [arm1, arm2] = arms
+ && arm1.guard.is_none()
+ && arm2.guard.is_none()
+ {
+ check(cx, expr, scrutinee, arm1.pat, arm1.body, Some(arm2.pat), arm2.body);
+ }
+}
+
+pub(super) fn check_if_let<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ let_pat: &'tcx Pat<'_>,
+ let_expr: &'tcx Expr<'_>,
+ then_expr: &'tcx Expr<'_>,
+ else_expr: &'tcx Expr<'_>,
+) {
+ check(cx, expr, let_expr, let_pat, then_expr, None, else_expr);
+}
+
- #[expect(clippy::too_many_lines)]
+fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ scrutinee: &'tcx Expr<'_>,
+ then_pat: &'tcx Pat<'_>,
+ then_body: &'tcx Expr<'_>,
+ else_pat: Option<&'tcx Pat<'_>>,
+ else_body: &'tcx Expr<'_>,
+) {
- let (scrutinee_ty, ty_ref_count, ty_mutability) =
- peel_mid_ty_refs_is_mutable(cx.typeck_results().expr_ty(scrutinee));
- if !(is_type_diagnostic_item(cx, scrutinee_ty, sym::Option)
- && is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(expr), sym::Option))
- {
- return;
- }
-
- let expr_ctxt = expr.span.ctxt();
- let (some_expr, some_pat, pat_ref_count, is_wild_none) = match (
- try_parse_pattern(cx, then_pat, expr_ctxt),
- else_pat.map_or(Some(OptionPat::Wild), |p| try_parse_pattern(cx, p, expr_ctxt)),
++ if let Some(sugg_info) = check_with(
++ cx,
++ expr,
++ scrutinee,
++ then_pat,
++ then_body,
++ else_pat,
++ else_body,
++ get_some_expr,
+ ) {
- (Some(OptionPat::Wild), Some(OptionPat::Some { pattern, ref_count })) if is_none_expr(cx, then_body) => {
- (else_body, pattern, ref_count, true)
- },
- (Some(OptionPat::None), Some(OptionPat::Some { pattern, ref_count })) if is_none_expr(cx, then_body) => {
- (else_body, pattern, ref_count, false)
- },
- (Some(OptionPat::Some { pattern, ref_count }), Some(OptionPat::Wild)) if is_none_expr(cx, else_body) => {
- (then_body, pattern, ref_count, true)
- },
- (Some(OptionPat::Some { pattern, ref_count }), Some(OptionPat::None)) if is_none_expr(cx, else_body) => {
- (then_body, pattern, ref_count, false)
- },
- _ => return,
- };
-
- // Top level or patterns aren't allowed in closures.
- if matches!(some_pat.kind, PatKind::Or(_)) {
- return;
- }
-
- let some_expr = match get_some_expr(cx, some_expr, false, expr_ctxt) {
- Some(expr) => expr,
- None => return,
- };
-
- // These two lints will go back and forth with each other.
- if cx.typeck_results().expr_ty(some_expr.expr) == cx.tcx.types.unit
- && !is_lint_allowed(cx, OPTION_MAP_UNIT_FN, expr.hir_id)
- {
- return;
- }
-
- // `map` won't perform any adjustments.
- if !cx.typeck_results().expr_adjustments(some_expr.expr).is_empty() {
- return;
- }
-
- // Determine which binding mode to use.
- let explicit_ref = some_pat.contains_explicit_ref_binding();
- let binding_ref = explicit_ref.or_else(|| (ty_ref_count != pat_ref_count).then_some(ty_mutability));
-
- let as_ref_str = match binding_ref {
- Some(Mutability::Mut) => ".as_mut()",
- Some(Mutability::Not) => ".as_ref()",
- None => "",
- };
-
- match can_move_expr_to_closure(cx, some_expr.expr) {
- Some(captures) => {
- // Check if captures the closure will need conflict with borrows made in the scrutinee.
- // TODO: check all the references made in the scrutinee expression. This will require interacting
- // with the borrow checker. Currently only `<local>[.<field>]*` is checked for.
- if let Some(binding_ref_mutability) = binding_ref {
- let e = peel_hir_expr_while(scrutinee, |e| match e.kind {
- ExprKind::Field(e, _) | ExprKind::AddrOf(_, _, e) => Some(e),
- _ => None,
- });
- if let ExprKind::Path(QPath::Resolved(None, Path { res: Res::Local(l), .. })) = e.kind {
- match captures.get(l) {
- Some(CaptureKind::Value | CaptureKind::Ref(Mutability::Mut)) => return,
- Some(CaptureKind::Ref(Mutability::Not)) if binding_ref_mutability == Mutability::Mut => {
- return;
- },
- Some(CaptureKind::Ref(Mutability::Not)) | None => (),
- }
- }
- }
- },
- None => return,
- };
-
- let mut app = Applicability::MachineApplicable;
-
- // Remove address-of expressions from the scrutinee. Either `as_ref` will be called, or
- // it's being passed by value.
- let scrutinee = peel_hir_expr_refs(scrutinee).0;
- let (scrutinee_str, _) = snippet_with_context(cx, scrutinee.span, expr_ctxt, "..", &mut app);
- let scrutinee_str = if scrutinee.span.ctxt() == expr.span.ctxt() && scrutinee.precedence().order() < PREC_POSTFIX {
- format!("({scrutinee_str})")
- } else {
- scrutinee_str.into()
- };
-
- let body_str = if let PatKind::Binding(annotation, id, some_binding, None) = some_pat.kind {
- if_chain! {
- if !some_expr.needs_unsafe_block;
- if let Some(func) = can_pass_as_func(cx, id, some_expr.expr);
- if func.span.ctxt() == some_expr.expr.span.ctxt();
- then {
- snippet_with_applicability(cx, func.span, "..", &mut app).into_owned()
++ span_lint_and_sugg(
++ cx,
++ MANUAL_MAP,
++ expr.span,
++ "manual implementation of `Option::map`",
++ "try this",
++ if sugg_info.needs_brackets {
++ format!(
++ "{{ {}{}.map({}) }}",
++ sugg_info.scrutinee_str, sugg_info.as_ref_str, sugg_info.body_str
++ )
+ } else {
- if path_to_local_id(some_expr.expr, id)
- && !is_lint_allowed(cx, MATCH_AS_REF, expr.hir_id)
- && binding_ref.is_some()
- {
- return;
- }
-
- // `ref` and `ref mut` annotations were handled earlier.
- let annotation = if matches!(annotation, BindingAnnotation::MUT) {
- "mut "
- } else {
- ""
- };
- let expr_snip = snippet_with_context(cx, some_expr.expr.span, expr_ctxt, "..", &mut app).0;
- if some_expr.needs_unsafe_block {
- format!("|{annotation}{some_binding}| unsafe {{ {expr_snip} }}")
- } else {
- format!("|{annotation}{some_binding}| {expr_snip}")
- }
- }
- }
- } else if !is_wild_none && explicit_ref.is_none() {
- // TODO: handle explicit reference annotations.
- let pat_snip = snippet_with_context(cx, some_pat.span, expr_ctxt, "..", &mut app).0;
- let expr_snip = snippet_with_context(cx, some_expr.expr.span, expr_ctxt, "..", &mut app).0;
- if some_expr.needs_unsafe_block {
- format!("|{pat_snip}| unsafe {{ {expr_snip} }}")
- } else {
- format!("|{pat_snip}| {expr_snip}")
- }
- } else {
- // Refutable bindings and mixed reference annotations can't be handled by `map`.
- return;
- };
-
- span_lint_and_sugg(
- cx,
- MANUAL_MAP,
- expr.span,
- "manual implementation of `Option::map`",
- "try this",
- if else_pat.is_none() && is_else_clause(cx.tcx, expr) {
- format!("{{ {scrutinee_str}{as_ref_str}.map({body_str}) }}")
- } else {
- format!("{scrutinee_str}{as_ref_str}.map({body_str})")
- },
- app,
- );
- }
-
- // Checks whether the expression could be passed as a function, or whether a closure is needed.
- // Returns the function to be passed to `map` if it exists.
- fn can_pass_as_func<'tcx>(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
- match expr.kind {
- ExprKind::Call(func, [arg])
- if path_to_local_id(arg, binding)
- && cx.typeck_results().expr_adjustments(arg).is_empty()
- && !type_is_unsafe_function(cx, cx.typeck_results().expr_ty(func).peel_refs()) =>
- {
- Some(func)
- },
- _ => None,
- }
- }
-
- enum OptionPat<'a> {
- Wild,
- None,
- Some {
- // The pattern contained in the `Some` tuple.
- pattern: &'a Pat<'a>,
- // The number of references before the `Some` tuple.
- // e.g. `&&Some(_)` has a ref count of 2.
- ref_count: usize,
- },
- }
-
- struct SomeExpr<'tcx> {
- expr: &'tcx Expr<'tcx>,
- needs_unsafe_block: bool,
- }
-
- // Try to parse into a recognized `Option` pattern.
- // i.e. `_`, `None`, `Some(..)`, or a reference to any of those.
- fn try_parse_pattern<'tcx>(cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>, ctxt: SyntaxContext) -> Option<OptionPat<'tcx>> {
- fn f<'tcx>(
- cx: &LateContext<'tcx>,
- pat: &'tcx Pat<'_>,
- ref_count: usize,
- ctxt: SyntaxContext,
- ) -> Option<OptionPat<'tcx>> {
- match pat.kind {
- PatKind::Wild => Some(OptionPat::Wild),
- PatKind::Ref(pat, _) => f(cx, pat, ref_count + 1, ctxt),
- PatKind::Path(ref qpath) if is_res_lang_ctor(cx, cx.qpath_res(qpath, pat.hir_id), OptionNone) => {
- Some(OptionPat::None)
- },
- PatKind::TupleStruct(ref qpath, [pattern], _)
- if is_res_lang_ctor(cx, cx.qpath_res(qpath, pat.hir_id), OptionSome) && pat.span.ctxt() == ctxt =>
- {
- Some(OptionPat::Some { pattern, ref_count })
++ format!(
++ "{}{}.map({})",
++ sugg_info.scrutinee_str, sugg_info.as_ref_str, sugg_info.body_str
++ )
+ },
- _ => None,
- }
++ sugg_info.app,
++ );
+ }
- f(cx, pat, 0, ctxt)
+}
+
+// Checks for an expression wrapped by the `Some` constructor. Returns the contained expression.
+fn get_some_expr<'tcx>(
+ cx: &LateContext<'tcx>,
++ _: &'tcx Pat<'_>,
+ expr: &'tcx Expr<'_>,
- needs_unsafe_block: bool,
+ ctxt: SyntaxContext,
+) -> Option<SomeExpr<'tcx>> {
- // TODO: Allow more complex expressions.
- match expr.kind {
- ExprKind::Call(callee, [arg])
- if ctxt == expr.span.ctxt() && is_res_lang_ctor(cx, path_res(cx, callee), OptionSome) =>
- {
- Some(SomeExpr {
- expr: arg,
- needs_unsafe_block,
- })
- },
- ExprKind::Block(
- Block {
- stmts: [],
- expr: Some(expr),
- rules,
- ..
++ fn get_some_expr_internal<'tcx>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx Expr<'_>,
++ needs_unsafe_block: bool,
++ ctxt: SyntaxContext,
++ ) -> Option<SomeExpr<'tcx>> {
++ // TODO: Allow more complex expressions.
++ match expr.kind {
++ ExprKind::Call(callee, [arg])
++ if ctxt == expr.span.ctxt() && is_res_lang_ctor(cx, path_res(cx, callee), OptionSome) =>
++ {
++ Some(SomeExpr::new_no_negated(arg, needs_unsafe_block))
+ },
- _,
- ) => get_some_expr(
- cx,
- expr,
- needs_unsafe_block || *rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided),
- ctxt,
- ),
- _ => None,
++ ExprKind::Block(
++ Block {
++ stmts: [],
++ expr: Some(expr),
++ rules,
++ ..
++ },
++ _,
++ ) => get_some_expr_internal(
++ cx,
++ expr,
++ needs_unsafe_block || *rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided),
++ ctxt,
++ ),
++ _ => None,
++ }
+ }
- }
-
- // Checks for the `None` value.
- fn is_none_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
- is_res_lang_ctor(cx, path_res(cx, peel_blocks(expr)), OptionNone)
++ get_some_expr_internal(cx, expr, false, ctxt)
+}
--- /dev/null
--- /dev/null
++use crate::{map_unit_fn::OPTION_MAP_UNIT_FN, matches::MATCH_AS_REF};
++use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
++use clippy_utils::ty::{is_copy, is_type_diagnostic_item, peel_mid_ty_refs_is_mutable, type_is_unsafe_function};
++use clippy_utils::{
++ can_move_expr_to_closure, is_else_clause, is_lint_allowed, is_res_lang_ctor, path_res, path_to_local_id,
++ peel_blocks, peel_hir_expr_refs, peel_hir_expr_while, sugg::Sugg, CaptureKind,
++};
++use rustc_ast::util::parser::PREC_POSTFIX;
++use rustc_errors::Applicability;
++use rustc_hir::LangItem::{OptionNone, OptionSome};
++use rustc_hir::{def::Res, BindingAnnotation, Expr, ExprKind, HirId, Mutability, Pat, PatKind, Path, QPath};
++use rustc_lint::LateContext;
++use rustc_span::{sym, SyntaxContext};
++
++#[expect(clippy::too_many_arguments)]
++#[expect(clippy::too_many_lines)]
++pub(super) fn check_with<'tcx, F>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx Expr<'_>,
++ scrutinee: &'tcx Expr<'_>,
++ then_pat: &'tcx Pat<'_>,
++ then_body: &'tcx Expr<'_>,
++ else_pat: Option<&'tcx Pat<'_>>,
++ else_body: &'tcx Expr<'_>,
++ get_some_expr_fn: F,
++) -> Option<SuggInfo<'tcx>>
++where
++ F: Fn(&LateContext<'tcx>, &'tcx Pat<'_>, &'tcx Expr<'_>, SyntaxContext) -> Option<SomeExpr<'tcx>>,
++{
++ let (scrutinee_ty, ty_ref_count, ty_mutability) =
++ peel_mid_ty_refs_is_mutable(cx.typeck_results().expr_ty(scrutinee));
++ if !(is_type_diagnostic_item(cx, scrutinee_ty, sym::Option)
++ && is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(expr), sym::Option))
++ {
++ return None;
++ }
++
++ let expr_ctxt = expr.span.ctxt();
++ let (some_expr, some_pat, pat_ref_count, is_wild_none) = match (
++ try_parse_pattern(cx, then_pat, expr_ctxt),
++ else_pat.map_or(Some(OptionPat::Wild), |p| try_parse_pattern(cx, p, expr_ctxt)),
++ ) {
++ (Some(OptionPat::Wild), Some(OptionPat::Some { pattern, ref_count })) if is_none_expr(cx, then_body) => {
++ (else_body, pattern, ref_count, true)
++ },
++ (Some(OptionPat::None), Some(OptionPat::Some { pattern, ref_count })) if is_none_expr(cx, then_body) => {
++ (else_body, pattern, ref_count, false)
++ },
++ (Some(OptionPat::Some { pattern, ref_count }), Some(OptionPat::Wild)) if is_none_expr(cx, else_body) => {
++ (then_body, pattern, ref_count, true)
++ },
++ (Some(OptionPat::Some { pattern, ref_count }), Some(OptionPat::None)) if is_none_expr(cx, else_body) => {
++ (then_body, pattern, ref_count, false)
++ },
++ _ => return None,
++ };
++
++ // Top level or patterns aren't allowed in closures.
++ if matches!(some_pat.kind, PatKind::Or(_)) {
++ return None;
++ }
++
++ let Some(some_expr) = get_some_expr_fn(cx, some_pat, some_expr, expr_ctxt) else {
++ return None;
++ };
++
++ // These two lints will go back and forth with each other.
++ if cx.typeck_results().expr_ty(some_expr.expr) == cx.tcx.types.unit
++ && !is_lint_allowed(cx, OPTION_MAP_UNIT_FN, expr.hir_id)
++ {
++ return None;
++ }
++
++ // `map` won't perform any adjustments.
++ if !cx.typeck_results().expr_adjustments(some_expr.expr).is_empty() {
++ return None;
++ }
++
++ // Determine which binding mode to use.
++ let explicit_ref = some_pat.contains_explicit_ref_binding();
++ let binding_ref = explicit_ref.or_else(|| (ty_ref_count != pat_ref_count).then_some(ty_mutability));
++
++ let as_ref_str = match binding_ref {
++ Some(Mutability::Mut) => ".as_mut()",
++ Some(Mutability::Not) => ".as_ref()",
++ None => "",
++ };
++
++ match can_move_expr_to_closure(cx, some_expr.expr) {
++ Some(captures) => {
++ // Check if captures the closure will need conflict with borrows made in the scrutinee.
++ // TODO: check all the references made in the scrutinee expression. This will require interacting
++ // with the borrow checker. Currently only `<local>[.<field>]*` is checked for.
++ if let Some(binding_ref_mutability) = binding_ref {
++ let e = peel_hir_expr_while(scrutinee, |e| match e.kind {
++ ExprKind::Field(e, _) | ExprKind::AddrOf(_, _, e) => Some(e),
++ _ => None,
++ });
++ if let ExprKind::Path(QPath::Resolved(None, Path { res: Res::Local(l), .. })) = e.kind {
++ match captures.get(l) {
++ Some(CaptureKind::Value | CaptureKind::Ref(Mutability::Mut)) => return None,
++ Some(CaptureKind::Ref(Mutability::Not)) if binding_ref_mutability == Mutability::Mut => {
++ return None;
++ },
++ Some(CaptureKind::Ref(Mutability::Not)) | None => (),
++ }
++ }
++ }
++ },
++ None => return None,
++ };
++
++ let mut app = Applicability::MachineApplicable;
++
++ // Remove address-of expressions from the scrutinee. Either `as_ref` will be called, or
++ // it's being passed by value.
++ let scrutinee = peel_hir_expr_refs(scrutinee).0;
++ let (scrutinee_str, _) = snippet_with_context(cx, scrutinee.span, expr_ctxt, "..", &mut app);
++ let scrutinee_str = if scrutinee.span.ctxt() == expr.span.ctxt() && scrutinee.precedence().order() < PREC_POSTFIX {
++ format!("({scrutinee_str})")
++ } else {
++ scrutinee_str.into()
++ };
++
++ let closure_expr_snip = some_expr.to_snippet_with_context(cx, expr_ctxt, &mut app);
++ let body_str = if let PatKind::Binding(annotation, id, some_binding, None) = some_pat.kind {
++ if_chain! {
++ if !some_expr.needs_unsafe_block;
++ if let Some(func) = can_pass_as_func(cx, id, some_expr.expr);
++ if func.span.ctxt() == some_expr.expr.span.ctxt();
++ then {
++ snippet_with_applicability(cx, func.span, "..", &mut app).into_owned()
++ } else {
++ if path_to_local_id(some_expr.expr, id)
++ && !is_lint_allowed(cx, MATCH_AS_REF, expr.hir_id)
++ && binding_ref.is_some()
++ {
++ return None;
++ }
++
++ // `ref` and `ref mut` annotations were handled earlier.
++ let annotation = if matches!(annotation, BindingAnnotation::MUT) {
++ "mut "
++ } else {
++ ""
++ };
++
++ if some_expr.needs_unsafe_block {
++ format!("|{annotation}{some_binding}| unsafe {{ {closure_expr_snip} }}")
++ } else {
++ format!("|{annotation}{some_binding}| {closure_expr_snip}")
++ }
++ }
++ }
++ } else if !is_wild_none && explicit_ref.is_none() {
++ // TODO: handle explicit reference annotations.
++ let pat_snip = snippet_with_context(cx, some_pat.span, expr_ctxt, "..", &mut app).0;
++ if some_expr.needs_unsafe_block {
++ format!("|{pat_snip}| unsafe {{ {closure_expr_snip} }}")
++ } else {
++ format!("|{pat_snip}| {closure_expr_snip}")
++ }
++ } else {
++ // Refutable bindings and mixed reference annotations can't be handled by `map`.
++ return None;
++ };
++
++ // relies on the fact that Option<T>: Copy where T: copy
++ let scrutinee_impl_copy = is_copy(cx, scrutinee_ty);
++
++ Some(SuggInfo {
++ needs_brackets: else_pat.is_none() && is_else_clause(cx.tcx, expr),
++ scrutinee_impl_copy,
++ scrutinee_str,
++ as_ref_str,
++ body_str,
++ app,
++ })
++}
++
++pub struct SuggInfo<'a> {
++ pub needs_brackets: bool,
++ pub scrutinee_impl_copy: bool,
++ pub scrutinee_str: String,
++ pub as_ref_str: &'a str,
++ pub body_str: String,
++ pub app: Applicability,
++}
++
++// Checks whether the expression could be passed as a function, or whether a closure is needed.
++// Returns the function to be passed to `map` if it exists.
++fn can_pass_as_func<'tcx>(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
++ match expr.kind {
++ ExprKind::Call(func, [arg])
++ if path_to_local_id(arg, binding)
++ && cx.typeck_results().expr_adjustments(arg).is_empty()
++ && !type_is_unsafe_function(cx, cx.typeck_results().expr_ty(func).peel_refs()) =>
++ {
++ Some(func)
++ },
++ _ => None,
++ }
++}
++
++#[derive(Debug)]
++pub(super) enum OptionPat<'a> {
++ Wild,
++ None,
++ Some {
++ // The pattern contained in the `Some` tuple.
++ pattern: &'a Pat<'a>,
++ // The number of references before the `Some` tuple.
++ // e.g. `&&Some(_)` has a ref count of 2.
++ ref_count: usize,
++ },
++}
++
++pub(super) struct SomeExpr<'tcx> {
++ pub expr: &'tcx Expr<'tcx>,
++ pub needs_unsafe_block: bool,
++ pub needs_negated: bool, // for `manual_filter` lint
++}
++
++impl<'tcx> SomeExpr<'tcx> {
++ pub fn new_no_negated(expr: &'tcx Expr<'tcx>, needs_unsafe_block: bool) -> Self {
++ Self {
++ expr,
++ needs_unsafe_block,
++ needs_negated: false,
++ }
++ }
++
++ pub fn to_snippet_with_context(
++ &self,
++ cx: &LateContext<'tcx>,
++ ctxt: SyntaxContext,
++ app: &mut Applicability,
++ ) -> Sugg<'tcx> {
++ let sugg = Sugg::hir_with_context(cx, self.expr, ctxt, "..", app);
++ if self.needs_negated { !sugg } else { sugg }
++ }
++}
++
++// Try to parse into a recognized `Option` pattern.
++// i.e. `_`, `None`, `Some(..)`, or a reference to any of those.
++pub(super) fn try_parse_pattern<'tcx>(
++ cx: &LateContext<'tcx>,
++ pat: &'tcx Pat<'_>,
++ ctxt: SyntaxContext,
++) -> Option<OptionPat<'tcx>> {
++ fn f<'tcx>(
++ cx: &LateContext<'tcx>,
++ pat: &'tcx Pat<'_>,
++ ref_count: usize,
++ ctxt: SyntaxContext,
++ ) -> Option<OptionPat<'tcx>> {
++ match pat.kind {
++ PatKind::Wild => Some(OptionPat::Wild),
++ PatKind::Ref(pat, _) => f(cx, pat, ref_count + 1, ctxt),
++ PatKind::Path(ref qpath) if is_res_lang_ctor(cx, cx.qpath_res(qpath, pat.hir_id), OptionNone) => {
++ Some(OptionPat::None)
++ },
++ PatKind::TupleStruct(ref qpath, [pattern], _)
++ if is_res_lang_ctor(cx, cx.qpath_res(qpath, pat.hir_id), OptionSome) && pat.span.ctxt() == ctxt =>
++ {
++ Some(OptionPat::Some { pattern, ref_count })
++ },
++ _ => None,
++ }
++ }
++ f(cx, pat, 0, ctxt)
++}
++
++// Checks for the `None` value.
++fn is_none_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
++ is_res_lang_ctor(cx, path_res(cx, peel_blocks(expr)), OptionNone)
++}
--- /dev/null
- #[expect(clippy::too_many_lines)]
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet;
+use clippy_utils::{path_to_local, search_same, SpanlessEq, SpanlessHash};
+use core::cmp::Ordering;
+use core::iter;
+use core::slice;
+use rustc_arena::DroplessArena;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Arm, Expr, ExprKind, HirId, HirIdMap, HirIdMapEntry, HirIdSet, Pat, PatKind, RangeEnd};
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+use rustc_span::Symbol;
+
+use super::MATCH_SAME_ARMS;
+
+#[expect(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>]) {
+ let hash = |&(_, arm): &(usize, &Arm<'_>)| -> u64 {
+ let mut h = SpanlessHash::new(cx);
+ h.hash_expr(arm.body);
+ h.finish()
+ };
+
+ let arena = DroplessArena::default();
+ let normalized_pats: Vec<_> = arms
+ .iter()
+ .map(|a| NormalizedPat::from_pat(cx, &arena, a.pat))
+ .collect();
+
+ // The furthest forwards a pattern can move without semantic changes
+ let forwards_blocking_idxs: Vec<_> = normalized_pats
+ .iter()
+ .enumerate()
+ .map(|(i, pat)| {
+ normalized_pats[i + 1..]
+ .iter()
+ .enumerate()
+ .find_map(|(j, other)| pat.has_overlapping_values(other).then_some(i + 1 + j))
+ .unwrap_or(normalized_pats.len())
+ })
+ .collect();
+
+ // The furthest backwards a pattern can move without semantic changes
+ let backwards_blocking_idxs: Vec<_> = normalized_pats
+ .iter()
+ .enumerate()
+ .map(|(i, pat)| {
+ normalized_pats[..i]
+ .iter()
+ .enumerate()
+ .rev()
+ .zip(forwards_blocking_idxs[..i].iter().copied().rev())
+ .skip_while(|&(_, forward_block)| forward_block > i)
+ .find_map(|((j, other), forward_block)| {
+ (forward_block == i || pat.has_overlapping_values(other)).then_some(j)
+ })
+ .unwrap_or(0)
+ })
+ .collect();
+
+ let eq = |&(lindex, lhs): &(usize, &Arm<'_>), &(rindex, rhs): &(usize, &Arm<'_>)| -> bool {
+ let min_index = usize::min(lindex, rindex);
+ let max_index = usize::max(lindex, rindex);
+
+ let mut local_map: HirIdMap<HirId> = HirIdMap::default();
+ let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
+ if_chain! {
+ if let Some(a_id) = path_to_local(a);
+ if let Some(b_id) = path_to_local(b);
+ let entry = match local_map.entry(a_id) {
+ HirIdMapEntry::Vacant(entry) => entry,
+ // check if using the same bindings as before
+ HirIdMapEntry::Occupied(entry) => return *entry.get() == b_id,
+ };
+ // the names technically don't have to match; this makes the lint more conservative
+ if cx.tcx.hir().name(a_id) == cx.tcx.hir().name(b_id);
+ if cx.typeck_results().expr_ty(a) == cx.typeck_results().expr_ty(b);
+ if pat_contains_local(lhs.pat, a_id);
+ if pat_contains_local(rhs.pat, b_id);
+ then {
+ entry.insert(b_id);
+ true
+ } else {
+ false
+ }
+ }
+ };
+ // Arms with a guard are ignored, those can’t always be merged together
+ // If both arms overlap with an arm in between then these can't be merged either.
+ !(backwards_blocking_idxs[max_index] > min_index && forwards_blocking_idxs[min_index] < max_index)
+ && lhs.guard.is_none()
+ && rhs.guard.is_none()
+ && SpanlessEq::new(cx)
+ .expr_fallback(eq_fallback)
+ .eq_expr(lhs.body, rhs.body)
+ // these checks could be removed to allow unused bindings
+ && bindings_eq(lhs.pat, local_map.keys().copied().collect())
+ && bindings_eq(rhs.pat, local_map.values().copied().collect())
+ };
+
+ let indexed_arms: Vec<(usize, &Arm<'_>)> = arms.iter().enumerate().collect();
+ for (&(i, arm1), &(j, arm2)) in search_same(&indexed_arms, hash, eq) {
+ if matches!(arm2.pat.kind, PatKind::Wild) {
+ span_lint_and_then(
+ cx,
+ MATCH_SAME_ARMS,
+ arm1.span,
+ "this match arm has an identical body to the `_` wildcard arm",
+ |diag| {
+ diag.span_suggestion(arm1.span, "try removing the arm", "", Applicability::MaybeIncorrect)
+ .help("or try changing either arm body")
+ .span_note(arm2.span, "`_` wildcard arm here");
+ },
+ );
+ } else {
+ let back_block = backwards_blocking_idxs[j];
+ let (keep_arm, move_arm) = if back_block < i || (back_block == 0 && forwards_blocking_idxs[i] <= j) {
+ (arm1, arm2)
+ } else {
+ (arm2, arm1)
+ };
+
+ span_lint_and_then(
+ cx,
+ MATCH_SAME_ARMS,
+ keep_arm.span,
+ "this match arm has an identical body to another arm",
+ |diag| {
+ let move_pat_snip = snippet(cx, move_arm.pat.span, "<pat2>");
+ let keep_pat_snip = snippet(cx, keep_arm.pat.span, "<pat1>");
+
+ diag.span_suggestion(
+ keep_arm.pat.span,
+ "try merging the arm patterns",
+ format!("{keep_pat_snip} | {move_pat_snip}"),
+ Applicability::MaybeIncorrect,
+ )
+ .help("or try changing either arm body")
+ .span_note(move_arm.span, "other arm here");
+ },
+ );
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+enum NormalizedPat<'a> {
+ Wild,
+ Struct(Option<DefId>, &'a [(Symbol, Self)]),
+ Tuple(Option<DefId>, &'a [Self]),
+ Or(&'a [Self]),
+ Path(Option<DefId>),
+ LitStr(Symbol),
+ LitBytes(&'a [u8]),
+ LitInt(u128),
+ LitBool(bool),
+ Range(PatRange),
+ /// A slice pattern. If the second value is `None`, then this matches an exact size. Otherwise
+ /// the first value contains everything before the `..` wildcard pattern, and the second value
+ /// contains everything afterwards. Note that either side, or both sides, may contain zero
+ /// patterns.
+ Slice(&'a [Self], Option<&'a [Self]>),
+}
+
+#[derive(Clone, Copy)]
+struct PatRange {
+ start: u128,
+ end: u128,
+ bounds: RangeEnd,
+}
+impl PatRange {
+ fn contains(&self, x: u128) -> bool {
+ x >= self.start
+ && match self.bounds {
+ RangeEnd::Included => x <= self.end,
+ RangeEnd::Excluded => x < self.end,
+ }
+ }
+
+ fn overlaps(&self, other: &Self) -> bool {
+ // Note: Empty ranges are impossible, so this is correct even though it would return true if an
+ // empty exclusive range were to reside within an inclusive range.
+ (match self.bounds {
+ RangeEnd::Included => self.end >= other.start,
+ RangeEnd::Excluded => self.end > other.start,
+ } && match other.bounds {
+ RangeEnd::Included => self.start <= other.end,
+ RangeEnd::Excluded => self.start < other.end,
+ })
+ }
+}
+
+/// Iterates over the pairs of fields with matching names.
+fn iter_matching_struct_fields<'a>(
+ left: &'a [(Symbol, NormalizedPat<'a>)],
+ right: &'a [(Symbol, NormalizedPat<'a>)],
+) -> impl Iterator<Item = (&'a NormalizedPat<'a>, &'a NormalizedPat<'a>)> + 'a {
+ struct Iter<'a>(
+ slice::Iter<'a, (Symbol, NormalizedPat<'a>)>,
+ slice::Iter<'a, (Symbol, NormalizedPat<'a>)>,
+ );
+ impl<'a> Iterator for Iter<'a> {
+ type Item = (&'a NormalizedPat<'a>, &'a NormalizedPat<'a>);
+ fn next(&mut self) -> Option<Self::Item> {
+ // Note: all the fields in each slice are sorted by symbol value.
+ let mut left = self.0.next()?;
+ let mut right = self.1.next()?;
+ loop {
+ match left.0.cmp(&right.0) {
+ Ordering::Equal => return Some((&left.1, &right.1)),
+ Ordering::Less => left = self.0.next()?,
+ Ordering::Greater => right = self.1.next()?,
+ }
+ }
+ }
+ }
+ Iter(left.iter(), right.iter())
+}
+
+#[expect(clippy::similar_names)]
+impl<'a> NormalizedPat<'a> {
- let adt = match cx.typeck_results().pat_ty(pat).ty_adt_def() {
- Some(x) => x,
- None => return Self::Wild,
+ fn from_pat(cx: &LateContext<'_>, arena: &'a DroplessArena, pat: &'a Pat<'_>) -> Self {
+ match pat.kind {
+ PatKind::Wild | PatKind::Binding(.., None) => Self::Wild,
+ PatKind::Binding(.., Some(pat)) | PatKind::Box(pat) | PatKind::Ref(pat, _) => {
+ Self::from_pat(cx, arena, pat)
+ },
+ PatKind::Struct(ref path, fields, _) => {
+ let fields =
+ arena.alloc_from_iter(fields.iter().map(|f| (f.ident.name, Self::from_pat(cx, arena, f.pat))));
+ fields.sort_by_key(|&(name, _)| name);
+ Self::Struct(cx.qpath_res(path, pat.hir_id).opt_def_id(), fields)
+ },
+ PatKind::TupleStruct(ref path, pats, wild_idx) => {
++ let Some(adt) = cx.typeck_results().pat_ty(pat).ty_adt_def() else {
++ return Self::Wild
+ };
+ let (var_id, variant) = if adt.is_enum() {
+ match cx.qpath_res(path, pat.hir_id).opt_def_id() {
+ Some(x) => (Some(x), adt.variant_with_ctor_id(x)),
+ None => return Self::Wild,
+ }
+ } else {
+ (None, adt.non_enum_variant())
+ };
+ let (front, back) = match wild_idx.as_opt_usize() {
+ Some(i) => pats.split_at(i),
+ None => (pats, [].as_slice()),
+ };
+ let pats = arena.alloc_from_iter(
+ front
+ .iter()
+ .map(|pat| Self::from_pat(cx, arena, pat))
+ .chain(iter::repeat_with(|| Self::Wild).take(variant.fields.len() - pats.len()))
+ .chain(back.iter().map(|pat| Self::from_pat(cx, arena, pat))),
+ );
+ Self::Tuple(var_id, pats)
+ },
+ PatKind::Or(pats) => Self::Or(arena.alloc_from_iter(pats.iter().map(|pat| Self::from_pat(cx, arena, pat)))),
+ PatKind::Path(ref path) => Self::Path(cx.qpath_res(path, pat.hir_id).opt_def_id()),
+ PatKind::Tuple(pats, wild_idx) => {
+ let field_count = match cx.typeck_results().pat_ty(pat).kind() {
+ ty::Tuple(subs) => subs.len(),
+ _ => return Self::Wild,
+ };
+ let (front, back) = match wild_idx.as_opt_usize() {
+ Some(i) => pats.split_at(i),
+ None => (pats, [].as_slice()),
+ };
+ let pats = arena.alloc_from_iter(
+ front
+ .iter()
+ .map(|pat| Self::from_pat(cx, arena, pat))
+ .chain(iter::repeat_with(|| Self::Wild).take(field_count - pats.len()))
+ .chain(back.iter().map(|pat| Self::from_pat(cx, arena, pat))),
+ );
+ Self::Tuple(None, pats)
+ },
+ PatKind::Lit(e) => match &e.kind {
+ // TODO: Handle negative integers. They're currently treated as a wild match.
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Str(sym, _) => Self::LitStr(sym),
+ LitKind::ByteStr(ref bytes) => Self::LitBytes(bytes),
+ LitKind::Byte(val) => Self::LitInt(val.into()),
+ LitKind::Char(val) => Self::LitInt(val.into()),
+ LitKind::Int(val, _) => Self::LitInt(val),
+ LitKind::Bool(val) => Self::LitBool(val),
+ LitKind::Float(..) | LitKind::Err => Self::Wild,
+ },
+ _ => Self::Wild,
+ },
+ PatKind::Range(start, end, bounds) => {
+ // TODO: Handle negative integers. They're currently treated as a wild match.
+ let start = match start {
+ None => 0,
+ Some(e) => match &e.kind {
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Int(val, _) => val,
+ LitKind::Char(val) => val.into(),
+ LitKind::Byte(val) => val.into(),
+ _ => return Self::Wild,
+ },
+ _ => return Self::Wild,
+ },
+ };
+ let (end, bounds) = match end {
+ None => (u128::MAX, RangeEnd::Included),
+ Some(e) => match &e.kind {
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Int(val, _) => (val, bounds),
+ LitKind::Char(val) => (val.into(), bounds),
+ LitKind::Byte(val) => (val.into(), bounds),
+ _ => return Self::Wild,
+ },
+ _ => return Self::Wild,
+ },
+ };
+ Self::Range(PatRange { start, end, bounds })
+ },
+ PatKind::Slice(front, wild_pat, back) => Self::Slice(
+ arena.alloc_from_iter(front.iter().map(|pat| Self::from_pat(cx, arena, pat))),
+ wild_pat.map(|_| &*arena.alloc_from_iter(back.iter().map(|pat| Self::from_pat(cx, arena, pat)))),
+ ),
+ }
+ }
+
+ /// Checks if two patterns overlap in the values they can match assuming they are for the same
+ /// type.
+ fn has_overlapping_values(&self, other: &Self) -> bool {
+ match (*self, *other) {
+ (Self::Wild, _) | (_, Self::Wild) => true,
+ (Self::Or(pats), ref other) | (ref other, Self::Or(pats)) => {
+ pats.iter().any(|pat| pat.has_overlapping_values(other))
+ },
+ (Self::Struct(lpath, lfields), Self::Struct(rpath, rfields)) => {
+ if lpath != rpath {
+ return false;
+ }
+ iter_matching_struct_fields(lfields, rfields).all(|(lpat, rpat)| lpat.has_overlapping_values(rpat))
+ },
+ (Self::Tuple(lpath, lpats), Self::Tuple(rpath, rpats)) => {
+ if lpath != rpath {
+ return false;
+ }
+ lpats
+ .iter()
+ .zip(rpats.iter())
+ .all(|(lpat, rpat)| lpat.has_overlapping_values(rpat))
+ },
+ (Self::Path(x), Self::Path(y)) => x == y,
+ (Self::LitStr(x), Self::LitStr(y)) => x == y,
+ (Self::LitBytes(x), Self::LitBytes(y)) => x == y,
+ (Self::LitInt(x), Self::LitInt(y)) => x == y,
+ (Self::LitBool(x), Self::LitBool(y)) => x == y,
+ (Self::Range(ref x), Self::Range(ref y)) => x.overlaps(y),
+ (Self::Range(ref range), Self::LitInt(x)) | (Self::LitInt(x), Self::Range(ref range)) => range.contains(x),
+ (Self::Slice(lpats, None), Self::Slice(rpats, None)) => {
+ lpats.len() == rpats.len() && lpats.iter().zip(rpats.iter()).all(|(x, y)| x.has_overlapping_values(y))
+ },
+ (Self::Slice(pats, None), Self::Slice(front, Some(back)))
+ | (Self::Slice(front, Some(back)), Self::Slice(pats, None)) => {
+ // Here `pats` is an exact size match. If the combined lengths of `front` and `back` are greater
+ // then the minimum length required will be greater than the length of `pats`.
+ if pats.len() < front.len() + back.len() {
+ return false;
+ }
+ pats[..front.len()]
+ .iter()
+ .zip(front.iter())
+ .chain(pats[pats.len() - back.len()..].iter().zip(back.iter()))
+ .all(|(x, y)| x.has_overlapping_values(y))
+ },
+ (Self::Slice(lfront, Some(lback)), Self::Slice(rfront, Some(rback))) => lfront
+ .iter()
+ .zip(rfront.iter())
+ .chain(lback.iter().rev().zip(rback.iter().rev()))
+ .all(|(x, y)| x.has_overlapping_values(y)),
+
+ // Enums can mix unit variants with tuple/struct variants. These can never overlap.
+ (Self::Path(_), Self::Tuple(..) | Self::Struct(..))
+ | (Self::Tuple(..) | Self::Struct(..), Self::Path(_)) => false,
+
+ // Tuples can be matched like a struct.
+ (Self::Tuple(x, _), Self::Struct(y, _)) | (Self::Struct(x, _), Self::Tuple(y, _)) => {
+ // TODO: check fields here.
+ x == y
+ },
+
+ // TODO: Lit* with Path, Range with Path, LitBytes with Slice
+ _ => true,
+ }
+ }
+}
+
+fn pat_contains_local(pat: &Pat<'_>, id: HirId) -> bool {
+ let mut result = false;
+ pat.walk_short(|p| {
+ result |= matches!(p.kind, PatKind::Binding(_, binding_id, ..) if binding_id == id);
+ !result
+ });
+ result
+}
+
+/// Returns true if all the bindings in the `Pat` are in `ids` and vice versa
+fn bindings_eq(pat: &Pat<'_>, mut ids: HirIdSet) -> bool {
+ let mut result = true;
+ pat.each_binding_or_first(&mut |_, id, _, _| result &= ids.remove(&id));
+ result && ids.is_empty()
+}
--- /dev/null
- let indent = " ".repeat(indent_of(cx, expr.span).unwrap_or(0));
- let sugg = format!(
- "{};\n{indent}{snippet_body}",
- snippet_with_applicability(cx, ex.span, "..", &mut applicability)
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::macros::HirNode;
+use clippy_utils::source::{indent_of, snippet, snippet_block, snippet_with_applicability};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::{get_parent_expr, is_refutable, peel_blocks};
+use rustc_errors::Applicability;
+use rustc_hir::{Arm, Expr, ExprKind, Node, PatKind};
+use rustc_lint::LateContext;
+use rustc_span::Span;
+
+use super::MATCH_SINGLE_BINDING;
+
+enum AssignmentExpr {
+ Assign { span: Span, match_span: Span },
+ Local { span: Span, pat_span: Span },
+}
+
+#[expect(clippy::too_many_lines)]
+pub(crate) fn check<'a>(cx: &LateContext<'a>, ex: &Expr<'a>, arms: &[Arm<'_>], expr: &Expr<'a>) {
+ if expr.span.from_expansion() || arms.len() != 1 || is_refutable(cx, arms[0].pat) {
+ return;
+ }
+
+ let matched_vars = ex.span;
+ let bind_names = arms[0].pat.span;
+ let match_body = peel_blocks(arms[0].body);
+ let mut snippet_body = if match_body.span.from_expansion() {
+ Sugg::hir_with_macro_callsite(cx, match_body, "..").to_string()
+ } else {
+ snippet_block(cx, match_body.span, "..", Some(expr.span)).to_string()
+ };
+
+ // Do we need to add ';' to suggestion ?
+ match match_body.kind {
+ ExprKind::Block(block, _) => {
+ // macro + expr_ty(body) == ()
+ if block.span.from_expansion() && cx.typeck_results().expr_ty(match_body).is_unit() {
+ snippet_body.push(';');
+ }
+ },
+ _ => {
+ // expr_ty(body) == ()
+ if cx.typeck_results().expr_ty(match_body).is_unit() {
+ snippet_body.push(';');
+ }
+ },
+ }
+
+ let mut applicability = Applicability::MaybeIncorrect;
+ match arms[0].pat.kind {
+ PatKind::Binding(..) | PatKind::Tuple(_, _) | PatKind::Struct(..) => {
+ let (target_span, sugg) = match opt_parent_assign_span(cx, ex) {
+ Some(AssignmentExpr::Assign { span, match_span }) => {
+ let sugg = sugg_with_curlies(
+ cx,
+ (ex, expr),
+ (bind_names, matched_vars),
+ &snippet_body,
+ &mut applicability,
+ Some(span),
++ true,
+ );
+
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ span.to(match_span),
+ "this assignment could be simplified",
+ "consider removing the `match` expression",
+ sugg,
+ applicability,
+ );
+
+ return;
+ },
+ Some(AssignmentExpr::Local { span, pat_span }) => (
+ span,
+ format!(
+ "let {} = {};\n{}let {} = {snippet_body};",
+ snippet_with_applicability(cx, bind_names, "..", &mut applicability),
+ snippet_with_applicability(cx, matched_vars, "..", &mut applicability),
+ " ".repeat(indent_of(cx, expr.span).unwrap_or(0)),
+ snippet_with_applicability(cx, pat_span, "..", &mut applicability)
+ ),
+ ),
+ None => {
+ let sugg = sugg_with_curlies(
+ cx,
+ (ex, expr),
+ (bind_names, matched_vars),
+ &snippet_body,
+ &mut applicability,
+ None,
++ true,
+ );
+ (expr.span, sugg)
+ },
+ };
+
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ target_span,
+ "this match could be written as a `let` statement",
+ "consider using a `let` statement",
+ sugg,
+ applicability,
+ );
+ },
+ PatKind::Wild => {
+ if ex.can_have_side_effects() {
- format!(
- "{cbrace_start}let {} = {};\n{indent}{assignment_str}{snippet_body}{cbrace_end}",
- snippet_with_applicability(cx, bind_names, "..", applicability),
- snippet_with_applicability(cx, matched_vars, "..", applicability)
- )
++ let sugg = sugg_with_curlies(
++ cx,
++ (ex, expr),
++ (bind_names, matched_vars),
++ &snippet_body,
++ &mut applicability,
++ None,
++ false,
+ );
+
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ expr.span,
+ "this match could be replaced by its scrutinee and body",
+ "consider using the scrutinee and body instead",
+ sugg,
+ applicability,
+ );
+ } else {
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ expr.span,
+ "this match could be replaced by its body itself",
+ "consider using the match body instead",
+ snippet_body,
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ _ => (),
+ }
+}
+
+/// Returns true if the `ex` match expression is in a local (`let`) or assign expression
+fn opt_parent_assign_span<'a>(cx: &LateContext<'a>, ex: &Expr<'a>) -> Option<AssignmentExpr> {
+ let map = &cx.tcx.hir();
+
+ if let Some(Node::Expr(parent_arm_expr)) = map.find(map.get_parent_node(ex.hir_id)) {
+ return match map.find(map.get_parent_node(parent_arm_expr.hir_id)) {
+ Some(Node::Local(parent_let_expr)) => Some(AssignmentExpr::Local {
+ span: parent_let_expr.span,
+ pat_span: parent_let_expr.pat.span(),
+ }),
+ Some(Node::Expr(Expr {
+ kind: ExprKind::Assign(parent_assign_expr, match_expr, _),
+ ..
+ })) => Some(AssignmentExpr::Assign {
+ span: parent_assign_expr.span,
+ match_span: match_expr.span,
+ }),
+ _ => None,
+ };
+ }
+
+ None
+}
+
+fn sugg_with_curlies<'a>(
+ cx: &LateContext<'a>,
+ (ex, match_expr): (&Expr<'a>, &Expr<'a>),
+ (bind_names, matched_vars): (Span, Span),
+ snippet_body: &str,
+ applicability: &mut Applicability,
+ assignment: Option<Span>,
++ needs_var_binding: bool,
+) -> String {
+ let mut indent = " ".repeat(indent_of(cx, ex.span).unwrap_or(0));
+
+ let (mut cbrace_start, mut cbrace_end) = (String::new(), String::new());
+ if let Some(parent_expr) = get_parent_expr(cx, match_expr) {
+ if let ExprKind::Closure { .. } = parent_expr.kind {
+ cbrace_end = format!("\n{indent}}}");
+ // Fix body indent due to the closure
+ indent = " ".repeat(indent_of(cx, bind_names).unwrap_or(0));
+ cbrace_start = format!("{{\n{indent}");
+ }
+ }
+
+ // If the parent is already an arm, and the body is another match statement,
+ // we need curly braces around suggestion
+ let parent_node_id = cx.tcx.hir().get_parent_node(match_expr.hir_id);
+ if let Node::Arm(arm) = &cx.tcx.hir().get(parent_node_id) {
+ if let ExprKind::Match(..) = arm.body.kind {
+ cbrace_end = format!("\n{indent}}}");
+ // Fix body indent due to the match
+ indent = " ".repeat(indent_of(cx, bind_names).unwrap_or(0));
+ cbrace_start = format!("{{\n{indent}");
+ }
+ }
+
+ let assignment_str = assignment.map_or_else(String::new, |span| {
+ let mut s = snippet(cx, span, "..").to_string();
+ s.push_str(" = ");
+ s
+ });
+
++ let scrutinee = if needs_var_binding {
++ format!(
++ "let {} = {}",
++ snippet_with_applicability(cx, bind_names, "..", applicability),
++ snippet_with_applicability(cx, matched_vars, "..", applicability)
++ )
++ } else {
++ snippet_with_applicability(cx, matched_vars, "..", applicability).to_string()
++ };
++
++ format!("{cbrace_start}{scrutinee};\n{indent}{assignment_str}{snippet_body}{cbrace_end}")
+}
--- /dev/null
+mod collapsible_match;
+mod infallible_destructuring_match;
++mod manual_filter;
+mod manual_map;
+mod manual_unwrap_or;
++mod manual_utils;
+mod match_as_ref;
+mod match_bool;
+mod match_like_matches;
+mod match_on_vec_items;
+mod match_ref_pats;
+mod match_same_arms;
+mod match_single_binding;
+mod match_str_case_mismatch;
+mod match_wild_enum;
+mod match_wild_err_arm;
+mod needless_match;
+mod overlapping_arms;
+mod redundant_pattern_match;
+mod rest_pat_in_fully_bound_struct;
+mod significant_drop_in_scrutinee;
+mod single_match;
+mod try_err;
+mod wild_in_or_pats;
+
+use clippy_utils::source::{snippet_opt, walk_span_to_context};
+use clippy_utils::{higher, in_constant, is_span_match, meets_msrv, msrvs};
+use rustc_hir::{Arm, Expr, ExprKind, Local, MatchSource, Pat};
+use rustc_lexer::{tokenize, TokenKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{Span, SpanData, SyntaxContext};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with a single arm where an `if let`
+ /// will usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => (),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH,
+ style,
+ "a `match` statement with a single nontrivial arm (i.e., where the other arm is `_ => {}`) instead of `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with two arms where an `if let else` will
+ /// usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Known problems
+ /// Personal style preferences may differ.
+ ///
+ /// ### Example
+ /// Using `match`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => bar(&other_ref),
+ /// }
+ /// ```
+ ///
+ /// Using `if let` with `else`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// } else {
+ /// bar(&other_ref);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH_ELSE,
+ pedantic,
+ "a `match` statement with two arms where the second arm's pattern is a placeholder instead of a specific match pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where all arms match a reference,
+ /// suggesting to remove the reference and deref the matched expression
+ /// instead. It also checks for `if let &foo = bar` blocks.
+ ///
+ /// ### Why is this bad?
+ /// It just makes the code less readable. That reference
+ /// destructuring adds nothing to the code.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match x {
+ /// &A(ref y) => foo(y),
+ /// &B => bar(),
+ /// _ => frob(&x),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// match *x {
+ /// A(ref y) => foo(y),
+ /// B => bar(),
+ /// _ => frob(x),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_REF_PATS,
+ style,
+ "a `match` or `if let` with all arms prefixed with `&` instead of deref-ing the match expression"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where match expression is a `bool`. It
+ /// suggests to replace the expression with an `if...else` block.
+ ///
+ /// ### Why is this bad?
+ /// It makes the code less readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// match condition {
+ /// true => foo(),
+ /// false => bar(),
+ /// }
+ /// ```
+ /// Use if/else instead:
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// if condition {
+ /// foo();
+ /// } else {
+ /// bar();
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_BOOL,
+ pedantic,
+ "a `match` on a boolean expression instead of an `if..else` block"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for overlapping match arms.
+ ///
+ /// ### Why is this bad?
+ /// It is likely to be an error and if not, makes the code
+ /// less obvious.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 5;
+ /// match x {
+ /// 1..=10 => println!("1 ... 10"),
+ /// 5..=15 => println!("5 ... 15"),
+ /// _ => (),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_OVERLAPPING_ARM,
+ style,
+ "a `match` with overlapping arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arm which matches all errors with `Err(_)`
+ /// and take drastic actions like `panic!`.
+ ///
+ /// ### Why is this bad?
+ /// It is generally a bad practice, similar to
+ /// catching all exceptions in java with `catch(Exception)`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Result<i32, &str> = Ok(3);
+ /// match x {
+ /// Ok(_) => println!("ok"),
+ /// Err(_) => panic!("err"),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_WILD_ERR_ARM,
+ pedantic,
+ "a `match` with `Err(_)` arm and take drastic actions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for match which is used to add a reference to an
+ /// `Option` value.
+ ///
+ /// ### Why is this bad?
+ /// Using `as_ref()` or `as_mut()` instead is shorter.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = match x {
+ /// None => None,
+ /// Some(ref v) => Some(v),
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = x.as_ref();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_AS_REF,
+ complexity,
+ "a `match` on an Option value instead of using `as_ref()` or `as_mut`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches using `_`.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect if guards exhaustively cover some
+ /// variants, and also may not use correct path to enum if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// Foo::B(_) => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub WILDCARD_ENUM_MATCH_ARM,
+ restriction,
+ "a wildcard enum match arm using `_`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches for a single variant.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may not use correct path to enum
+ /// if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// Foo::C => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ pedantic,
+ "a wildcard enum match for a single variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard pattern used with others patterns in same match arm.
+ ///
+ /// ### Why is this bad?
+ /// Wildcard pattern already covers any other pattern as it will match anyway.
+ /// It makes the code less readable, especially to spot wildcard pattern use in match arm.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// "bar" | _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub WILDCARD_IN_OR_PATTERNS,
+ complexity,
+ "a wildcard pattern used with others patterns in same match arm"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches being used to destructure a single-variant enum
+ /// or tuple struct where a `let` will suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `let` doesn't nest, whereas a `match` does.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ ///
+ /// let data = match wrapper {
+ /// Wrapper::Data(i) => i,
+ /// };
+ /// ```
+ ///
+ /// The correct use would be:
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ /// let Wrapper::Data(data) = wrapper;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INFALLIBLE_DESTRUCTURING_MATCH,
+ style,
+ "a `match` statement with a single infallible arm instead of a `let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for useless match that binds to only one value.
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect when `match`
+ /// is actually binding temporary value, bringing a 'dropped while borrowed' error.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// match (a, b) {
+ /// (c, d) => {
+ /// // useless match
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// let (c, d) = (a, b);
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub MATCH_SINGLE_BINDING,
+ complexity,
+ "a match with a single binding instead of using `let` statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary '..' pattern binding on struct when all fields are explicitly matched.
+ ///
+ /// ### Why is this bad?
+ /// Correctness and readability. It's like having a wildcard pattern after
+ /// matching all enum variants explicitly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// let a = A { a: 5 };
+ ///
+ /// match a {
+ /// A { a: 5, .. } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// # let a = A { a: 5 };
+ /// match a {
+ /// A { a: 5 } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ restriction,
+ "a match on a struct that binds all fields but still uses the wildcard pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lint for redundant pattern matching over `Result`, `Option`,
+ /// `std::task::Poll` or `std::net::IpAddr`
+ ///
+ /// ### Why is this bad?
+ /// It's more concise and clear to just use the proper
+ /// utility function
+ ///
+ /// ### Known problems
+ /// This will change the drop order for the matched type. Both `if let` and
+ /// `while let` will drop the value at the end of the block, both `if` and `while` will drop the
+ /// value before entering the block. For most types this change will not matter, but for a few
+ /// types this will not be an acceptable change (e.g. locks). See the
+ /// [reference](https://doc.rust-lang.org/reference/destructors.html#drop-scopes) for more about
+ /// drop order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if let Ok(_) = Ok::<i32, i32>(42) {}
+ /// if let Err(_) = Err::<i32, i32>(42) {}
+ /// if let None = None::<()> {}
+ /// if let Some(_) = Some(42) {}
+ /// if let Poll::Pending = Poll::Pending::<()> {}
+ /// if let Poll::Ready(_) = Poll::Ready(42) {}
+ /// if let IpAddr::V4(_) = IpAddr::V4(Ipv4Addr::LOCALHOST) {}
+ /// if let IpAddr::V6(_) = IpAddr::V6(Ipv6Addr::LOCALHOST) {}
+ /// match Ok::<i32, i32>(42) {
+ /// Ok(_) => true,
+ /// Err(_) => false,
+ /// };
+ /// ```
+ ///
+ /// The more idiomatic use would be:
+ ///
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if Ok::<i32, i32>(42).is_ok() {}
+ /// if Err::<i32, i32>(42).is_err() {}
+ /// if None::<()>.is_none() {}
+ /// if Some(42).is_some() {}
+ /// if Poll::Pending::<()>.is_pending() {}
+ /// if Poll::Ready(42).is_ready() {}
+ /// if IpAddr::V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
+ /// if IpAddr::V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
+ /// Ok::<i32, i32>(42).is_ok();
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub REDUNDANT_PATTERN_MATCHING,
+ style,
+ "use the proper utility function avoiding an `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` or `if let` expressions producing a
+ /// `bool` that could be written using `matches!`
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// This lint falsely triggers, if there are arms with
+ /// `cfg` attributes that remove an arm evaluating to `false`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(5);
+ ///
+ /// let a = match x {
+ /// Some(0) => true,
+ /// _ => false,
+ /// };
+ ///
+ /// let a = if let Some(0) = x {
+ /// true
+ /// } else {
+ /// false
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = Some(5);
+ /// let a = matches!(x, Some(0));
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MATCH_LIKE_MATCHES_MACRO,
+ style,
+ "a match that could be written with the matches! macro"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` with identical arm bodies.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error. If arm bodies
+ /// are the same on purpose, you can factor them
+ /// [using `|`](https://doc.rust-lang.org/book/patterns.html#multiple-patterns).
+ ///
+ /// ### Known problems
+ /// False positive possible with order dependent `match`
+ /// (see issue
+ /// [#860](https://github.com/rust-lang/rust-clippy/issues/860)).
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => bar(), // <= oops
+ /// }
+ /// ```
+ ///
+ /// This should probably be
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => baz(), // <= fixed
+ /// }
+ /// ```
+ ///
+ /// or if the original code was not a typo:
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar | Baz => bar(), // <= shows the intent better
+ /// Quz => quz(),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_SAME_ARMS,
+ pedantic,
+ "`match` with identical arm bodies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary `match` or match-like `if let` returns for `Option` and `Result`
+ /// when function signatures are the same.
+ ///
+ /// ### Why is this bad?
+ /// This `match` block does nothing and might not be what the coder intended.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// match result {
+ /// Ok(val) => Ok(val),
+ /// Err(err) => Err(err),
+ /// }
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// if let Some(val) = option {
+ /// Some(val)
+ /// } else {
+ /// None
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Could be replaced as
+ ///
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// result
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// option
+ /// }
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub NEEDLESS_MATCH,
+ complexity,
+ "`match` or match-like `if let` that are unnecessary"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds nested `match` or `if let` expressions where the patterns may be "collapsed" together
+ /// without adding any branches.
+ ///
+ /// Note that this lint is not intended to find _all_ cases where nested match patterns can be merged, but only
+ /// cases where merging would most likely make the code more readable.
+ ///
+ /// ### Why is this bad?
+ /// It is unnecessarily verbose and complex.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(n) => match n {
+ /// Ok(n) => n,
+ /// _ => return,
+ /// }
+ /// None => return,
+ /// };
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(Ok(n)) => n,
+ /// _ => return,
+ /// };
+ /// }
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub COLLAPSIBLE_MATCH,
+ style,
+ "Nested `match` or `if let` expressions where the patterns may be \"collapsed\" together."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds patterns that reimplement `Option::unwrap_or` or `Result::unwrap_or`.
+ ///
+ /// ### Why is this bad?
+ /// Concise code helps focusing on behavior instead of boilerplate.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// match foo {
+ /// Some(v) => v,
+ /// None => 1,
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.unwrap_or(1);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_UNWRAP_OR,
+ complexity,
+ "finds patterns that can be encoded more concisely with `Option::unwrap_or` or `Result::unwrap_or`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match vec[idx]` or `match vec[n..m]`.
+ ///
+ /// ### Why is this bad?
+ /// This can panic at runtime.
+ ///
+ /// ### Example
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr[idx] {
+ /// 0 => println!("{}", 0),
+ /// 1 => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr.get(idx) {
+ /// Some(0) => println!("{}", 0),
+ /// Some(1) => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_ON_VEC_ITEMS,
+ pedantic,
+ "matching on vector elements can panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` expressions modifying the case of a string with non-compliant arms
+ ///
+ /// ### Why is this bad?
+ /// The arm is unreachable, which is likely a mistake
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "Bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub MATCH_STR_CASE_MISMATCH,
+ correctness,
+ "creation of a case altering match expression with non-compliant arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check for temporaries returned from function calls in a match scrutinee that have the
+ /// `clippy::has_significant_drop` attribute.
+ ///
+ /// ### Why is this bad?
+ /// The `clippy::has_significant_drop` attribute can be added to types whose Drop impls have
+ /// an important side-effect, such as unlocking a mutex, making it important for users to be
+ /// able to accurately understand their lifetimes. When a temporary is returned in a function
+ /// call in a match scrutinee, its lifetime lasts until the end of the match block, which may
+ /// be surprising.
+ ///
+ /// For `Mutex`es this can lead to a deadlock. This happens when the match scrutinee uses a
+ /// function call that returns a `MutexGuard` and then tries to lock again in one of the match
+ /// arms. In that case the `MutexGuard` in the scrutinee will not be dropped until the end of
+ /// the match block and thus will not unlock.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// # use std::sync::Mutex;
+ /// # struct State {}
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
+ /// # fn bar(&self) {}
+ /// # }
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// match mutex.lock().unwrap().foo() {
+ /// true => {
+ /// mutex.lock().unwrap().bar(); // Deadlock!
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::Mutex;
+ /// # struct State {}
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
+ /// # fn bar(&self) {}
+ /// # }
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// let is_foo = mutex.lock().unwrap().foo();
+ /// match is_foo {
+ /// true => {
+ /// mutex.lock().unwrap().bar();
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub SIGNIFICANT_DROP_IN_SCRUTINEE,
+ nursery,
+ "warns when a temporary of a type with a drop with a significant side-effect might have a surprising lifetime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Err(x)?`.
+ ///
+ /// ### Why is this bad?
+ /// The `?` operator is designed to allow calls that
+ /// can fail to be easily chained. For example, `foo()?.bar()` or
+ /// `foo(bar()?)`. Because `Err(x)?` can't be used that way (it will
+ /// always return), it is more clear to write `return Err(x)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// Err("failed")?;
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ /// Could be written:
+ ///
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// return Err("failed".into());
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ #[clippy::version = "1.38.0"]
+ pub TRY_ERR,
+ restriction,
+ "return errors explicitly rather than hiding them behind a `?`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `match` which could be implemented using `map`
+ ///
+ /// ### Why is this bad?
+ /// Using the `map` method is clearer and more concise.
+ ///
+ /// ### Example
+ /// ```rust
+ /// match Some(0) {
+ /// Some(x) => Some(x + 1),
+ /// None => None,
+ /// };
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// Some(0).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub MANUAL_MAP,
+ style,
+ "reimplementation of `map`"
+}
+
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for usages of `match` which could be implemented using `filter`
++ ///
++ /// ### Why is this bad?
++ /// Using the `filter` method is clearer and more concise.
++ ///
++ /// ### Example
++ /// ```rust
++ /// match Some(0) {
++ /// Some(x) => if x % 2 == 0 {
++ /// Some(x)
++ /// } else {
++ /// None
++ /// },
++ /// None => None,
++ /// };
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// Some(0).filter(|&x| x % 2 == 0);
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub MANUAL_FILTER,
++ complexity,
++ "reimplentation of `filter`"
++}
++
+#[derive(Default)]
+pub struct Matches {
+ msrv: Option<RustcVersion>,
+ infallible_destructuring_match_linted: bool,
+}
+
+impl Matches {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self {
+ msrv,
+ ..Matches::default()
+ }
+ }
+}
+
+impl_lint_pass!(Matches => [
+ SINGLE_MATCH,
+ MATCH_REF_PATS,
+ MATCH_BOOL,
+ SINGLE_MATCH_ELSE,
+ MATCH_OVERLAPPING_ARM,
+ MATCH_WILD_ERR_ARM,
+ MATCH_AS_REF,
+ WILDCARD_ENUM_MATCH_ARM,
+ MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ WILDCARD_IN_OR_PATTERNS,
+ MATCH_SINGLE_BINDING,
+ INFALLIBLE_DESTRUCTURING_MATCH,
+ REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ REDUNDANT_PATTERN_MATCHING,
+ MATCH_LIKE_MATCHES_MACRO,
+ MATCH_SAME_ARMS,
+ NEEDLESS_MATCH,
+ COLLAPSIBLE_MATCH,
+ MANUAL_UNWRAP_OR,
+ MATCH_ON_VEC_ITEMS,
+ MATCH_STR_CASE_MISMATCH,
+ SIGNIFICANT_DROP_IN_SCRUTINEE,
+ TRY_ERR,
+ MANUAL_MAP,
++ MANUAL_FILTER,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Matches {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if in_external_macro(cx.sess(), expr.span) {
+ return;
+ }
+ let from_expansion = expr.span.from_expansion();
+
+ if let ExprKind::Match(ex, arms, source) = expr.kind {
+ if source == MatchSource::Normal && !is_span_match(cx, expr.span) {
+ return;
+ }
+ if matches!(source, MatchSource::Normal | MatchSource::ForLoopDesugar) {
+ significant_drop_in_scrutinee::check(cx, expr, ex, arms, source);
+ }
+
+ collapsible_match::check_match(cx, arms);
+ if !from_expansion {
+ // These don't depend on a relationship between multiple arms
+ match_wild_err_arm::check(cx, ex, arms);
+ wild_in_or_pats::check(cx, arms);
+ }
+
+ if source == MatchSource::TryDesugar {
+ try_err::check(cx, expr, ex);
+ }
+
+ if !from_expansion && !contains_cfg_arm(cx, expr, ex, arms) {
+ if source == MatchSource::Normal {
+ if !(meets_msrv(self.msrv, msrvs::MATCHES_MACRO)
+ && match_like_matches::check_match(cx, expr, ex, arms))
+ {
+ match_same_arms::check(cx, arms);
+ }
+
+ redundant_pattern_match::check_match(cx, expr, ex, arms);
+ single_match::check(cx, ex, arms, expr);
+ match_bool::check(cx, ex, arms, expr);
+ overlapping_arms::check(cx, ex, arms);
+ match_wild_enum::check(cx, ex, arms);
+ match_as_ref::check(cx, ex, arms, expr);
+ needless_match::check_match(cx, ex, arms, expr);
+ match_on_vec_items::check(cx, ex);
+ match_str_case_mismatch::check(cx, ex, arms);
+
+ if !in_constant(cx, expr.hir_id) {
+ manual_unwrap_or::check(cx, expr, ex, arms);
+ manual_map::check_match(cx, expr, ex, arms);
++ manual_filter::check_match(cx, ex, arms, expr);
+ }
+
+ if self.infallible_destructuring_match_linted {
+ self.infallible_destructuring_match_linted = false;
+ } else {
+ match_single_binding::check(cx, ex, arms, expr);
+ }
+ }
+ match_ref_pats::check(cx, ex, arms.iter().map(|el| el.pat), expr);
+ }
+ } else if let Some(if_let) = higher::IfLet::hir(cx, expr) {
+ collapsible_match::check_if_let(cx, if_let.let_pat, if_let.if_then, if_let.if_else);
+ if !from_expansion {
+ if let Some(else_expr) = if_let.if_else {
+ if meets_msrv(self.msrv, msrvs::MATCHES_MACRO) {
+ match_like_matches::check_if_let(
+ cx,
+ expr,
+ if_let.let_pat,
+ if_let.let_expr,
+ if_let.if_then,
+ else_expr,
+ );
+ }
+ if !in_constant(cx, expr.hir_id) {
+ manual_map::check_if_let(cx, expr, if_let.let_pat, if_let.let_expr, if_let.if_then, else_expr);
++ manual_filter::check_if_let(
++ cx,
++ expr,
++ if_let.let_pat,
++ if_let.let_expr,
++ if_let.if_then,
++ else_expr,
++ );
+ }
+ }
+ redundant_pattern_match::check_if_let(
+ cx,
+ expr,
+ if_let.let_pat,
+ if_let.let_expr,
+ if_let.if_else.is_some(),
+ );
+ needless_match::check_if_let(cx, expr, &if_let);
+ }
+ } else if !from_expansion {
+ redundant_pattern_match::check(cx, expr);
+ }
+ }
+
+ fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx Local<'_>) {
+ self.infallible_destructuring_match_linted |=
+ local.els.is_none() && infallible_destructuring_match::check(cx, local);
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ rest_pat_in_fully_bound_struct::check(cx, pat);
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+/// Checks if there are any arms with a `#[cfg(..)]` attribute.
+fn contains_cfg_arm(cx: &LateContext<'_>, e: &Expr<'_>, scrutinee: &Expr<'_>, arms: &[Arm<'_>]) -> bool {
+ let Some(scrutinee_span) = walk_span_to_context(scrutinee.span, SyntaxContext::root()) else {
+ // Shouldn't happen, but treat this as though a `cfg` attribute were found
+ return true;
+ };
+
+ let start = scrutinee_span.hi();
+ let mut arm_spans = arms.iter().map(|arm| {
+ let data = arm.span.data();
+ (data.ctxt == SyntaxContext::root()).then_some((data.lo, data.hi))
+ });
+ let end = e.span.hi();
+
+ // Walk through all the non-code space before each match arm. The space trailing the final arm is
+ // handled after the `try_fold` e.g.
+ //
+ // match foo {
+ // _________^- everything between the scrutinee and arm1
+ //| arm1 => (),
+ //|---^___________^ everything before arm2
+ //| #[cfg(feature = "enabled")]
+ //| arm2 => some_code(),
+ //|---^____________________^ everything before arm3
+ //| // some comment about arm3
+ //| arm3 => some_code(),
+ //|---^____________________^ everything after arm3
+ //| #[cfg(feature = "disabled")]
+ //| arm4 = some_code(),
+ //|};
+ //|^
+ let found = arm_spans.try_fold(start, |start, range| {
+ let Some((end, next_start)) = range else {
+ // Shouldn't happen as macros can't expand to match arms, but treat this as though a `cfg` attribute were
+ // found.
+ return Err(());
+ };
+ let span = SpanData {
+ lo: start,
+ hi: end,
+ ctxt: SyntaxContext::root(),
+ parent: None,
+ }
+ .span();
+ (!span_contains_cfg(cx, span)).then_some(next_start).ok_or(())
+ });
+ match found {
+ Ok(start) => {
+ let span = SpanData {
+ lo: start,
+ hi: end,
+ ctxt: SyntaxContext::root(),
+ parent: None,
+ }
+ .span();
+ span_contains_cfg(cx, span)
+ },
+ Err(()) => true,
+ }
+}
+
+/// Checks if the given span contains a `#[cfg(..)]` attribute
+fn span_contains_cfg(cx: &LateContext<'_>, s: Span) -> bool {
+ let Some(snip) = snippet_opt(cx, s) else {
+ // Assume true. This would require either an invalid span, or one which crosses file boundaries.
+ return true;
+ };
+ let mut pos = 0usize;
+ let mut iter = tokenize(&snip).map(|t| {
+ let start = pos;
+ pos += t.len as usize;
+ (t.kind, start..pos)
+ });
+
+ // Search for the token sequence [`#`, `[`, `cfg`]
+ while iter.any(|(t, _)| matches!(t, TokenKind::Pound)) {
+ let mut iter = iter.by_ref().skip_while(|(t, _)| {
+ matches!(
+ t,
+ TokenKind::Whitespace | TokenKind::LineComment { .. } | TokenKind::BlockComment { .. }
+ )
+ });
+ if matches!(iter.next(), Some((TokenKind::OpenBracket, _)))
+ && matches!(iter.next(), Some((TokenKind::Ident, range)) if &snip[range.clone()] == "cfg")
+ {
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
- use clippy_utils::ty::{implements_trait, match_type, peel_mid_ty_refs};
- use clippy_utils::{
- is_lint_allowed, is_unit_expr, is_wild, paths, peel_blocks, peel_hir_pat_refs, peel_n_hir_expr_refs,
- };
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{expr_block, snippet};
- let candidates = [&paths::COW, &paths::OPTION, &paths::RESULT];
++use clippy_utils::ty::{implements_trait, is_type_diagnostic_item, peel_mid_ty_refs};
++use clippy_utils::{is_lint_allowed, is_unit_expr, is_wild, peel_blocks, peel_hir_pat_refs, peel_n_hir_expr_refs};
+use core::cmp::max;
+use rustc_errors::Applicability;
+use rustc_hir::{Arm, BindingAnnotation, Block, Expr, ExprKind, Pat, PatKind};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
++use rustc_span::sym;
+
+use super::{MATCH_BOOL, SINGLE_MATCH, SINGLE_MATCH_ELSE};
+
+#[rustfmt::skip]
+pub(crate) fn check(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ if arms.len() == 2 && arms[0].guard.is_none() && arms[1].guard.is_none() {
+ if expr.span.from_expansion() {
+ // Don't lint match expressions present in
+ // macro_rules! block
+ return;
+ }
+ if let PatKind::Or(..) = arms[0].pat.kind {
+ // don't lint for or patterns for now, this makes
+ // the lint noisy in unnecessary situations
+ return;
+ }
+ let els = arms[1].body;
+ let els = if is_unit_expr(peel_blocks(els)) {
+ None
+ } else if let ExprKind::Block(Block { stmts, expr: block_expr, .. }, _) = els.kind {
+ if stmts.len() == 1 && block_expr.is_none() || stmts.is_empty() && block_expr.is_some() {
+ // single statement/expr "else" block, don't lint
+ return;
+ }
+ // block with 2+ statements or 1 expr and 1+ statement
+ Some(els)
+ } else {
+ // not a block, don't lint
+ return;
+ };
+
+ let ty = cx.typeck_results().expr_ty(ex);
+ if *ty.kind() != ty::Bool || is_lint_allowed(cx, MATCH_BOOL, ex.hir_id) {
+ check_single_pattern(cx, ex, arms, expr, els);
+ check_opt_like(cx, ex, arms, expr, ty, els);
+ }
+ }
+}
+
+fn check_single_pattern(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ els: Option<&Expr<'_>>,
+) {
+ if is_wild(arms[1].pat) {
+ report_single_pattern(cx, ex, arms, expr, els);
+ }
+}
+
+fn report_single_pattern(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ els: Option<&Expr<'_>>,
+) {
+ let lint = if els.is_some() { SINGLE_MATCH_ELSE } else { SINGLE_MATCH };
+ let els_str = els.map_or(String::new(), |els| {
+ format!(" else {}", expr_block(cx, els, None, "..", Some(expr.span)))
+ });
+
+ let (pat, pat_ref_count) = peel_hir_pat_refs(arms[0].pat);
+ let (msg, sugg) = if_chain! {
+ if let PatKind::Path(_) | PatKind::Lit(_) = pat.kind;
+ let (ty, ty_ref_count) = peel_mid_ty_refs(cx.typeck_results().expr_ty(ex));
+ if let Some(spe_trait_id) = cx.tcx.lang_items().structural_peq_trait();
+ if let Some(pe_trait_id) = cx.tcx.lang_items().eq_trait();
+ if ty.is_integral() || ty.is_char() || ty.is_str()
+ || (implements_trait(cx, ty, spe_trait_id, &[])
+ && implements_trait(cx, ty, pe_trait_id, &[ty.into()]));
+ then {
+ // scrutinee derives PartialEq and the pattern is a constant.
+ let pat_ref_count = match pat.kind {
+ // string literals are already a reference.
+ PatKind::Lit(Expr { kind: ExprKind::Lit(lit), .. }) if lit.node.is_str() => pat_ref_count + 1,
+ _ => pat_ref_count,
+ };
+ // References are only implicitly added to the pattern, so no overflow here.
+ // e.g. will work: match &Some(_) { Some(_) => () }
+ // will not: match Some(_) { &Some(_) => () }
+ let ref_count_diff = ty_ref_count - pat_ref_count;
+
+ // Try to remove address of expressions first.
+ let (ex, removed) = peel_n_hir_expr_refs(ex, ref_count_diff);
+ let ref_count_diff = ref_count_diff - removed;
+
+ let msg = "you seem to be trying to use `match` for an equality check. Consider using `if`";
+ let sugg = format!(
+ "if {} == {}{} {}{els_str}",
+ snippet(cx, ex.span, ".."),
+ // PartialEq for different reference counts may not exist.
+ "&".repeat(ref_count_diff),
+ snippet(cx, arms[0].pat.span, ".."),
+ expr_block(cx, arms[0].body, None, "..", Some(expr.span)),
+ );
+ (msg, sugg)
+ } else {
+ let msg = "you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`";
+ let sugg = format!(
+ "if let {} = {} {}{els_str}",
+ snippet(cx, arms[0].pat.span, ".."),
+ snippet(cx, ex.span, ".."),
+ expr_block(cx, arms[0].body, None, "..", Some(expr.span)),
+ );
+ (msg, sugg)
+ }
+ };
+
+ span_lint_and_sugg(
+ cx,
+ lint,
+ expr.span,
+ msg,
+ "try this",
+ sugg,
+ Applicability::HasPlaceholders,
+ );
+}
+
+fn check_opt_like<'a>(
+ cx: &LateContext<'a>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ ty: Ty<'a>,
+ els: Option<&Expr<'_>>,
+) {
+ // We don't want to lint if the second arm contains an enum which could
+ // have more variants in the future.
+ if form_exhaustive_matches(cx, ty, arms[0].pat, arms[1].pat) {
+ report_single_pattern(cx, ex, arms, expr, els);
+ }
+}
+
+/// Returns `true` if all of the types in the pattern are enums which we know
+/// won't be expanded in the future
+fn pat_in_candidate_enum<'a>(cx: &LateContext<'a>, ty: Ty<'a>, pat: &Pat<'_>) -> bool {
+ let mut paths_and_types = Vec::new();
+ collect_pat_paths(&mut paths_and_types, cx, pat, ty);
+ paths_and_types.iter().all(|ty| in_candidate_enum(cx, *ty))
+}
+
+/// Returns `true` if the given type is an enum we know won't be expanded in the future
+fn in_candidate_enum<'a>(cx: &LateContext<'a>, ty: Ty<'_>) -> bool {
+ // list of candidate `Enum`s we know will never get any more members
- if match_type(cx, ty, candidate_ty) {
++ let candidates = [sym::Cow, sym::Option, sym::Result];
+
+ for candidate_ty in candidates {
++ if is_type_diagnostic_item(cx, ty, candidate_ty) {
+ return true;
+ }
+ }
+ false
+}
+
+/// Collects types from the given pattern
+fn collect_pat_paths<'a>(acc: &mut Vec<Ty<'a>>, cx: &LateContext<'a>, pat: &Pat<'_>, ty: Ty<'a>) {
+ match pat.kind {
+ PatKind::Tuple(inner, _) => inner.iter().for_each(|p| {
+ let p_ty = cx.typeck_results().pat_ty(p);
+ collect_pat_paths(acc, cx, p, p_ty);
+ }),
+ PatKind::TupleStruct(..) | PatKind::Binding(BindingAnnotation::NONE, .., None) | PatKind::Path(_) => {
+ acc.push(ty);
+ },
+ _ => {},
+ }
+}
+
+/// Returns true if the given arm of pattern matching contains wildcard patterns.
+fn contains_only_wilds(pat: &Pat<'_>) -> bool {
+ match pat.kind {
+ PatKind::Wild => true,
+ PatKind::Tuple(inner, _) | PatKind::TupleStruct(_, inner, ..) => inner.iter().all(contains_only_wilds),
+ _ => false,
+ }
+}
+
+/// Returns true if the given patterns forms only exhaustive matches that don't contain enum
+/// patterns without a wildcard.
+fn form_exhaustive_matches<'a>(cx: &LateContext<'a>, ty: Ty<'a>, left: &Pat<'_>, right: &Pat<'_>) -> bool {
+ match (&left.kind, &right.kind) {
+ (PatKind::Wild, _) | (_, PatKind::Wild) => true,
+ (PatKind::Tuple(left_in, left_pos), PatKind::Tuple(right_in, right_pos)) => {
+ // We don't actually know the position and the presence of the `..` (dotdot) operator
+ // in the arms, so we need to evaluate the correct offsets here in order to iterate in
+ // both arms at the same time.
+ let left_pos = left_pos.as_opt_usize();
+ let right_pos = right_pos.as_opt_usize();
+ let len = max(
+ left_in.len() + usize::from(left_pos.is_some()),
+ right_in.len() + usize::from(right_pos.is_some()),
+ );
+ let mut left_pos = left_pos.unwrap_or(usize::MAX);
+ let mut right_pos = right_pos.unwrap_or(usize::MAX);
+ let mut left_dot_space = 0;
+ let mut right_dot_space = 0;
+ for i in 0..len {
+ let mut found_dotdot = false;
+ if i == left_pos {
+ left_dot_space += 1;
+ if left_dot_space < len - left_in.len() {
+ left_pos += 1;
+ }
+ found_dotdot = true;
+ }
+ if i == right_pos {
+ right_dot_space += 1;
+ if right_dot_space < len - right_in.len() {
+ right_pos += 1;
+ }
+ found_dotdot = true;
+ }
+ if found_dotdot {
+ continue;
+ }
+ if !contains_only_wilds(&left_in[i - left_dot_space])
+ && !contains_only_wilds(&right_in[i - right_dot_space])
+ {
+ return false;
+ }
+ }
+ true
+ },
+ (PatKind::TupleStruct(..), PatKind::Path(_)) => pat_in_candidate_enum(cx, ty, right),
+ (PatKind::TupleStruct(..), PatKind::TupleStruct(_, inner, _)) => {
+ pat_in_candidate_enum(cx, ty, right) && inner.iter().all(contains_only_wilds)
+ },
+ _ => false,
+ }
+}
--- /dev/null
- let mutbl = match self_ref_ty.kind() {
- ty::Ref(_, _, mutbl) => mutbl,
- _ => unreachable!(),
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_trait_method;
+use clippy_utils::ty::has_iter_method;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::source_map::Span;
+use rustc_span::symbol::{sym, Symbol};
+
+use super::INTO_ITER_ON_REF;
+
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ method_span: Span,
+ method_name: Symbol,
+ receiver: &hir::Expr<'_>,
+) {
+ let self_ty = cx.typeck_results().expr_ty_adjusted(receiver);
+ if_chain! {
+ if let ty::Ref(..) = self_ty.kind();
+ if method_name == sym::into_iter;
+ if is_trait_method(cx, expr, sym::IntoIterator);
+ if let Some((kind, method_name)) = ty_has_iter_method(cx, self_ty);
+ then {
+ span_lint_and_sugg(
+ cx,
+ INTO_ITER_ON_REF,
+ method_span,
+ &format!(
+ "this `.into_iter()` call is equivalent to `.{method_name}()` and will not consume the `{kind}`",
+ ),
+ "call directly",
+ method_name.to_string(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+}
+
+fn ty_has_iter_method(cx: &LateContext<'_>, self_ref_ty: Ty<'_>) -> Option<(Symbol, &'static str)> {
+ has_iter_method(cx, self_ref_ty).map(|ty_name| {
++ let ty::Ref(_, _, mutbl) = self_ref_ty.kind() else {
++ unreachable!()
+ };
+ let method_name = match mutbl {
+ hir::Mutability::Not => "iter",
+ hir::Mutability::Mut => "iter_mut",
+ };
+ (ty_name, method_name)
+ })
+}
--- /dev/null
- let mm = if let Some(mm) = is_min_or_max(cx, unwrap_arg) {
- mm
- } else {
- return;
- };
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{match_def_path, path_def_id};
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty::layout::LayoutOf;
+
+pub fn check(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ arith_lhs: &hir::Expr<'_>,
+ arith_rhs: &hir::Expr<'_>,
+ unwrap_arg: &hir::Expr<'_>,
+ arith: &str,
+) {
+ let ty = cx.typeck_results().expr_ty(arith_lhs);
+ if !ty.is_integral() {
+ return;
+ }
+
- let sign = if let Some(sign) = lit_sign(arith_rhs) {
- sign
- } else {
++ let Some(mm) = is_min_or_max(cx, unwrap_arg) else { return };
+
+ if ty.is_signed() {
+ use self::{
+ MinMax::{Max, Min},
+ Sign::{Neg, Pos},
+ };
+
++ let Some(sign) = lit_sign(arith_rhs) else {
+ return;
+ };
+
+ match (arith, sign, mm) {
+ ("add", Pos, Max) | ("add", Neg, Min) | ("sub", Neg, Max) | ("sub", Pos, Min) => (),
+ // "mul" is omitted because lhs can be negative.
+ _ => return,
+ }
+ } else {
+ match (mm, arith) {
+ (MinMax::Max, "add" | "mul") | (MinMax::Min, "sub") => (),
+ _ => return,
+ }
+ }
+
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ super::MANUAL_SATURATING_ARITHMETIC,
+ expr.span,
+ "manual saturating arithmetic",
+ &format!("try using `saturating_{arith}`"),
+ format!(
+ "{}.saturating_{arith}({})",
+ snippet_with_applicability(cx, arith_lhs.span, "..", &mut applicability),
+ snippet_with_applicability(cx, arith_rhs.span, "..", &mut applicability),
+ ),
+ applicability,
+ );
+}
+
+#[derive(PartialEq, Eq)]
+enum MinMax {
+ Min,
+ Max,
+}
+
+fn is_min_or_max<'tcx>(cx: &LateContext<'tcx>, expr: &hir::Expr<'_>) -> Option<MinMax> {
+ // `T::max_value()` `T::min_value()` inherent methods
+ if_chain! {
+ if let hir::ExprKind::Call(func, args) = &expr.kind;
+ if args.is_empty();
+ if let hir::ExprKind::Path(hir::QPath::TypeRelative(_, segment)) = &func.kind;
+ then {
+ match segment.ident.as_str() {
+ "max_value" => return Some(MinMax::Max),
+ "min_value" => return Some(MinMax::Min),
+ _ => {}
+ }
+ }
+ }
+
+ let ty = cx.typeck_results().expr_ty(expr);
+ let ty_str = ty.to_string();
+
+ // `std::T::MAX` `std::T::MIN` constants
+ if let Some(id) = path_def_id(cx, expr) {
+ if match_def_path(cx, id, &["core", &ty_str, "MAX"]) {
+ return Some(MinMax::Max);
+ }
+
+ if match_def_path(cx, id, &["core", &ty_str, "MIN"]) {
+ return Some(MinMax::Min);
+ }
+ }
+
+ // Literals
+ let bits = cx.layout_of(ty).unwrap().size.bits();
+ let (minval, maxval): (u128, u128) = if ty.is_signed() {
+ let minval = 1 << (bits - 1);
+ let mut maxval = !(1 << (bits - 1));
+ if bits != 128 {
+ maxval &= (1 << bits) - 1;
+ }
+ (minval, maxval)
+ } else {
+ (0, if bits == 128 { !0 } else { (1 << bits) - 1 })
+ };
+
+ let check_lit = |expr: &hir::Expr<'_>, check_min: bool| {
+ if let hir::ExprKind::Lit(lit) = &expr.kind {
+ if let ast::LitKind::Int(value, _) = lit.node {
+ if value == maxval {
+ return Some(MinMax::Max);
+ }
+
+ if check_min && value == minval {
+ return Some(MinMax::Min);
+ }
+ }
+ }
+
+ None
+ };
+
+ if let r @ Some(_) = check_lit(expr, !ty.is_signed()) {
+ return r;
+ }
+
+ if ty.is_signed() {
+ if let hir::ExprKind::Unary(hir::UnOp::Neg, val) = &expr.kind {
+ return check_lit(val, true);
+ }
+ }
+
+ None
+}
+
+#[derive(PartialEq, Eq)]
+enum Sign {
+ Pos,
+ Neg,
+}
+
+fn lit_sign(expr: &hir::Expr<'_>) -> Option<Sign> {
+ if let hir::ExprKind::Unary(hir::UnOp::Neg, inner) = &expr.kind {
+ if let hir::ExprKind::Lit(..) = &inner.kind {
+ return Some(Sign::Neg);
+ }
+ } else if let hir::ExprKind::Lit(..) = &expr.kind {
+ return Some(Sign::Pos);
+ }
+
+ None
+}
--- /dev/null
- use clippy_utils::{
- contains_return, get_trait_def_id, is_trait_method, iter_input_pats, meets_msrv, msrvs, paths, return_ty,
- };
+mod bind_instead_of_map;
+mod bytecount;
+mod bytes_count_to_len;
+mod bytes_nth;
+mod case_sensitive_file_extension_comparisons;
+mod chars_cmp;
+mod chars_cmp_with_unwrap;
+mod chars_last_cmp;
+mod chars_last_cmp_with_unwrap;
+mod chars_next_cmp;
+mod chars_next_cmp_with_unwrap;
+mod clone_on_copy;
+mod clone_on_ref_ptr;
+mod cloned_instead_of_copied;
+mod collapsible_str_replace;
+mod err_expect;
+mod expect_fun_call;
+mod expect_used;
+mod extend_with_drain;
+mod filetype_is_file;
+mod filter_map;
+mod filter_map_identity;
+mod filter_map_next;
+mod filter_next;
+mod flat_map_identity;
+mod flat_map_option;
+mod from_iter_instead_of_collect;
+mod get_first;
+mod get_last_with_len;
+mod get_unwrap;
+mod implicit_clone;
+mod inefficient_to_string;
+mod inspect_for_each;
+mod into_iter_on_ref;
+mod is_digit_ascii_radix;
+mod iter_cloned_collect;
+mod iter_count;
+mod iter_kv_map;
+mod iter_next_slice;
+mod iter_nth;
+mod iter_nth_zero;
+mod iter_on_single_or_empty_collections;
+mod iter_overeager_cloned;
+mod iter_skip_next;
+mod iter_with_drain;
+mod iterator_step_by_zero;
+mod manual_ok_or;
+mod manual_saturating_arithmetic;
+mod manual_str_repeat;
+mod map_clone;
+mod map_collect_result_unit;
+mod map_err_ignore;
+mod map_flatten;
+mod map_identity;
+mod map_unwrap_or;
+mod mut_mutex_lock;
+mod needless_option_as_deref;
+mod needless_option_take;
+mod no_effect_replace;
+mod obfuscated_if_else;
+mod ok_expect;
+mod open_options;
+mod option_as_ref_deref;
+mod option_map_or_none;
+mod option_map_unwrap_or;
+mod or_fun_call;
+mod or_then_unwrap;
+mod path_buf_push_overwrite;
+mod range_zip_with_len;
+mod repeat_once;
+mod search_is_some;
+mod single_char_add_str;
+mod single_char_insert_string;
+mod single_char_pattern;
+mod single_char_push_string;
+mod skip_while_next;
+mod stable_sort_primitive;
+mod str_splitn;
+mod string_extend_chars;
+mod suspicious_map;
+mod suspicious_splitn;
+mod suspicious_to_owned;
+mod uninit_assumed_init;
+mod unit_hash;
+mod unnecessary_filter_map;
+mod unnecessary_fold;
+mod unnecessary_iter_cloned;
+mod unnecessary_join;
+mod unnecessary_lazy_eval;
+mod unnecessary_sort_by;
+mod unnecessary_to_owned;
+mod unwrap_or_else_default;
+mod unwrap_used;
+mod useless_asref;
+mod utils;
+mod vec_resize_to_zero;
+mod verbose_file_reads;
+mod wrong_self_convention;
+mod zst_offset;
+
+use bind_instead_of_map::BindInsteadOfMap;
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::ty::{contains_adt_constructor, implements_trait, is_copy, is_type_diagnostic_item};
- let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
++use clippy_utils::{contains_return, is_trait_method, iter_input_pats, meets_msrv, msrvs, return_ty};
+use if_chain::if_chain;
+use rustc_hir as hir;
+use rustc_hir::def::Res;
+use rustc_hir::{Expr, ExprKind, PrimTy, QPath, TraitItem, TraitItemKind};
+use rustc_hir_analysis::hir_ty_to_ty;
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, TraitRef, Ty};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `cloned()` on an `Iterator` or `Option` where
+ /// `copied()` could be used instead.
+ ///
+ /// ### Why is this bad?
+ /// `copied()` is better because it guarantees that the type being cloned
+ /// implements `Copy`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1, 2, 3].iter().cloned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// [1, 2, 3].iter().copied();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub CLONED_INSTEAD_OF_COPIED,
+ pedantic,
+ "used `cloned` where `copied` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for consecutive calls to `str::replace` (2 or more)
+ /// that can be collapsed into a single call.
+ ///
+ /// ### Why is this bad?
+ /// Consecutive `str::replace` calls scan the string multiple times
+ /// with repetitive code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let hello = "hesuo worpd"
+ /// .replace('s', "l")
+ /// .replace("u", "l")
+ /// .replace('p', "l");
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let hello = "hesuo worpd".replace(&['s', 'u', 'p'], "l");
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub COLLAPSIBLE_STR_REPLACE,
+ perf,
+ "collapse consecutive calls to str::replace (2 or more) into a single call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.cloned().<func>()` where call to `.cloned()` can be postponed.
+ ///
+ /// ### Why is this bad?
+ /// It's often inefficient to clone all elements of an iterator, when eventually, only some
+ /// of them will be consumed.
+ ///
+ /// ### Known Problems
+ /// This `lint` removes the side of effect of cloning items in the iterator.
+ /// A code that relies on that side-effect could fail.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let vec = vec!["string".to_string()];
+ /// vec.iter().cloned().take(10);
+ /// vec.iter().cloned().last();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec!["string".to_string()];
+ /// vec.iter().take(10).cloned();
+ /// vec.iter().last().cloned();
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub ITER_OVEREAGER_CLONED,
+ perf,
+ "using `cloned()` early with `Iterator::iter()` can lead to some performance inefficiencies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
+ /// used instead.
+ ///
+ /// ### Why is this bad?
+ /// When applicable, `filter_map()` is more clear since it shows that
+ /// `Option` is used to produce 0 or 1 items.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().flat_map(|x| x.parse().ok()).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().filter_map(|x| x.parse().ok()).collect();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub FLAT_MAP_OPTION,
+ pedantic,
+ "used `flat_map` where `filter_map` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.unwrap()` or `.unwrap_err()` calls on `Result`s and `.unwrap()` call on `Option`s.
+ ///
+ /// ### Why is this bad?
+ /// It is better to handle the `None` or `Err` case,
+ /// or at least call `.expect(_)` with a more helpful message. Still, for a lot of
+ /// quick-and-dirty code, `unwrap` is a good choice, which is why this lint is
+ /// `Allow` by default.
+ ///
+ /// `result.unwrap()` will let the thread panic on `Err` values.
+ /// Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// Even if you want to panic on errors, not all `Error`s implement good
+ /// messages on display. Therefore, it may be beneficial to look at the places
+ /// where they may get displayed. Activate this lint to do just that.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.unwrap();
+ /// result.unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.expect("more helpful message");
+ /// result.expect("more helpful message");
+ /// ```
+ ///
+ /// If [expect_used](#expect_used) is enabled, instead:
+ /// ```rust,ignore
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option?;
+ ///
+ /// // or
+ ///
+ /// result?;
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub UNWRAP_USED,
+ restriction,
+ "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.expect()` or `.expect_err()` calls on `Result`s and `.expect()` call on `Option`s.
+ ///
+ /// ### Why is this bad?
+ /// Usually it is better to handle the `None` or `Err` case.
+ /// Still, for a lot of quick-and-dirty code, `expect` is a good choice, which is why
+ /// this lint is `Allow` by default.
+ ///
+ /// `result.expect()` will let the thread panic on `Err`
+ /// values. Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// ### Examples
+ /// ```rust,ignore
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.expect("one");
+ /// result.expect("one");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option?;
+ ///
+ /// // or
+ ///
+ /// result?;
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub EXPECT_USED,
+ restriction,
+ "using `.expect()` on `Result` or `Option`, which might be better handled"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods that should live in a trait
+ /// implementation of a `std` trait (see [llogiq's blog
+ /// post](http://llogiq.github.io/2015/07/30/traits.html) for further
+ /// information) instead of an inherent implementation.
+ ///
+ /// ### Why is this bad?
+ /// Implementing the traits improve ergonomics for users of
+ /// the code, often with very little cost. Also people seeing a `mul(...)`
+ /// method
+ /// may expect `*` to work equally, so you should have good reason to disappoint
+ /// them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct X;
+ /// impl X {
+ /// fn add(&self, other: &X) -> X {
+ /// // ..
+ /// # X
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHOULD_IMPLEMENT_TRAIT,
+ style,
+ "defining a method that should be implementing a std trait"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods with certain name prefixes and which
+ /// doesn't match how self is taken. The actual rules are:
+ ///
+ /// |Prefix |Postfix |`self` taken | `self` type |
+ /// |-------|------------|-------------------------------|--------------|
+ /// |`as_` | none |`&self` or `&mut self` | any |
+ /// |`from_`| none | none | any |
+ /// |`into_`| none |`self` | any |
+ /// |`is_` | none |`&mut self` or `&self` or none | any |
+ /// |`to_` | `_mut` |`&mut self` | any |
+ /// |`to_` | not `_mut` |`self` | `Copy` |
+ /// |`to_` | not `_mut` |`&self` | not `Copy` |
+ ///
+ /// Note: Clippy doesn't trigger methods with `to_` prefix in:
+ /// - Traits definition.
+ /// Clippy can not tell if a type that implements a trait is `Copy` or not.
+ /// - Traits implementation, when `&self` is taken.
+ /// The method signature is controlled by the trait and often `&self` is required for all types that implement the trait
+ /// (see e.g. the `std::string::ToString` trait).
+ ///
+ /// Clippy allows `Pin<&Self>` and `Pin<&mut Self>` if `&self` and `&mut self` is required.
+ ///
+ /// Please find more info here:
+ /// https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
+ ///
+ /// ### Why is this bad?
+ /// Consistency breeds readability. If you follow the
+ /// conventions, your users won't be surprised that they, e.g., need to supply a
+ /// mutable reference to a `as_..` function.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct X;
+ /// impl X {
+ /// fn as_str(self) -> &'static str {
+ /// // ..
+ /// # ""
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub WRONG_SELF_CONVENTION,
+ style,
+ "defining a method named with an established prefix (like \"into_\") that takes `self` with the wrong convention"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `ok().expect(..)`.
+ ///
+ /// ### Why is this bad?
+ /// Because you usually call `expect()` on the `Result`
+ /// directly to get a better error message.
+ ///
+ /// ### Known problems
+ /// The error type needs to implement `Debug`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = Ok::<_, ()>(());
+ /// x.ok().expect("why did I do this again?");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = Ok::<_, ()>(());
+ /// x.expect("why did I do this again?");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OK_EXPECT,
+ style,
+ "using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.err().expect()` calls on the `Result` type.
+ ///
+ /// ### Why is this bad?
+ /// `.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
+ ///
+ /// ### Example
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.err().expect("Testing err().expect()");
+ /// ```
+ /// Use instead:
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.expect_err("Testing expect_err");
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub ERR_EXPECT,
+ style,
+ r#"using `.err().expect("")` when `.expect_err("")` can be used"#
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `_.unwrap_or_else(Default::default)` on `Option` and
+ /// `Result` values.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written as `_.unwrap_or_default`, which is
+ /// simpler and more concise.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let x = Some(1);
+ /// x.unwrap_or_else(Default::default);
+ /// x.unwrap_or_else(u32::default);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = Some(1);
+ /// x.unwrap_or_default();
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub UNWRAP_OR_ELSE_DEFAULT,
+ style,
+ "using `.unwrap_or_else(Default::default)`, which is more succinctly expressed as `.unwrap_or_default()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `option.map(_).unwrap_or(_)` or `option.map(_).unwrap_or_else(_)` or
+ /// `result.map(_).unwrap_or_else(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written more concisely (resp.) as
+ /// `option.map_or(_, _)`, `option.map_or_else(_, _)` and `result.map_or_else(_, _)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// # fn some_function(foo: ()) -> usize { 1 }
+ /// option.map(|a| a + 1).unwrap_or(0);
+ /// result.map(|a| a + 1).unwrap_or_else(some_function);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// # fn some_function(foo: ()) -> usize { 1 }
+ /// option.map_or(0, |a| a + 1);
+ /// result.map_or_else(some_function, |a| a + 1);
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MAP_UNWRAP_OR,
+ pedantic,
+ "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, _)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.and_then(_)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some(1);
+ /// opt.map_or(None, |a| Some(a + 1));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let opt = Some(1);
+ /// opt.and_then(|a| Some(a + 1));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OPTION_MAP_OR_NONE,
+ style,
+ "using `Option.map_or(None, f)`, which is more succinctly expressed as `and_then(f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, Some)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ok()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.map_or(None, Some));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.ok());
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub RESULT_MAP_OR_INTO_OPTION,
+ style,
+ "using `Result.map_or(None, Some)`, which is more succinctly expressed as `ok()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or
+ /// `_.or_else(|x| Err(y))`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.map(|x| y)` or `_.map_err(|x| y)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().and_then(|s| Some(s.len()));
+ /// let _ = res().and_then(|s| if s.len() == 42 { Ok(10) } else { Ok(20) });
+ /// let _ = res().or_else(|s| if s.len() == 42 { Err(10) } else { Err(20) });
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().map(|s| s.len());
+ /// let _ = res().map(|s| if s.len() == 42 { 10 } else { 20 });
+ /// let _ = res().map_err(|s| if s.len() == 42 { 10 } else { 20 });
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub BIND_INSTEAD_OF_MAP,
+ complexity,
+ "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().filter(|x| **x == 0).next();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FILTER_NEXT,
+ complexity,
+ "using `filter(p).next()`, which is more succinctly expressed as `.find(p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.skip_while(condition).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(!condition)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().skip_while(|x| **x == 0).next();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x != 0);
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub SKIP_WHILE_NEXT,
+ complexity,
+ "using `skip_while(p).next()`, which is more succinctly expressed as `.find(!p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).flatten(_)` on `Iterator` and `Option`
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.flat_map(_)` for `Iterator` or `_.and_then(_)` for `Option`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec = vec![vec![1]];
+ /// let opt = Some(5);
+ ///
+ /// vec.iter().map(|x| x.iter()).flatten();
+ /// opt.map(|x| Some(x * 2)).flatten();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![vec![1]];
+ /// # let opt = Some(5);
+ /// vec.iter().flat_map(|x| x.iter());
+ /// opt.and_then(|x| Some(x * 2));
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub MAP_FLATTEN,
+ complexity,
+ "using combinations of `flatten` and `map` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).map(_)` that can be written more simply
+ /// as `filter_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `filter` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// (0_i32..10)
+ /// .filter(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # #[allow(unused)]
+ /// (0_i32..10).filter_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FILTER_MAP,
+ complexity,
+ "using `_.filter(_).map(_)` in a way that can be written more simply as `filter_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.find(_).map(_)` that can be written more simply
+ /// as `find_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `find` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0_i32..10)
+ /// .find(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// (0_i32..10).find_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FIND_MAP,
+ complexity,
+ "using `_.find(_).map(_)` in a way that can be written more simply as `find_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter_map(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find_map(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).filter_map(|x| if x == 2 { Some(x) } else { None }).next();
+ /// ```
+ /// Can be written as
+ ///
+ /// ```rust
+ /// (0..3).find_map(|x| if x == 2 { Some(x) } else { None });
+ /// ```
+ #[clippy::version = "1.36.0"]
+ pub FILTER_MAP_NEXT,
+ pedantic,
+ "using combination of `filter_map` and `next` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `flat_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flat_map(|x| x);
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub FLAT_MAP_IDENTITY,
+ complexity,
+ "call to `flat_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for an iterator or string search (such as `find()`,
+ /// `position()`, or `rposition()`) followed by a call to `is_some()` or `is_none()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as:
+ /// * `_.any(_)`, or `_.contains(_)` for `is_some()`,
+ /// * `!_.any(_)`, or `!_.contains(_)` for `is_none()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0).is_some();
+ ///
+ /// "hello world".find("world").is_none();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let vec = vec![1];
+ /// vec.iter().any(|x| *x == 0);
+ ///
+ /// # #[allow(unused)]
+ /// !"hello world".contains("world");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SEARCH_IS_SOME,
+ complexity,
+ "using an iterator or string search followed by `is_some()` or `is_none()`, which is more succinctly expressed as a call to `any()` or `contains()` (with negation in case of `is_none()`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.chars().next()` on a `str` to check
+ /// if it starts with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.starts_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let name = "foo";
+ /// if name.chars().next() == Some('_') {};
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let name = "foo";
+ /// if name.starts_with('_') {};
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_NEXT_CMP,
+ style,
+ "using `.chars().next()` to check if a string starts with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.or(foo(..))`, `.unwrap_or(foo(..))`,
+ /// `.or_insert(foo(..))` etc., and suggests to use `.or_else(|| foo(..))`,
+ /// `.unwrap_or_else(|| foo(..))`, `.unwrap_or_default()` or `.or_default()`
+ /// etc. instead.
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called and potentially
+ /// allocate an object acting as the default.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantic of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or(String::new());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_else(String::new);
+ ///
+ /// // or
+ ///
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_default();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OR_FUN_CALL,
+ perf,
+ "using any `*or` method with a function call, which suggests `*or_else`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.or(…).unwrap()` calls to Options and Results.
+ ///
+ /// ### Why is this bad?
+ /// You should use `.unwrap_or(…)` instead for clarity.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let fallback = "fallback";
+ /// // Result
+ /// # type Error = &'static str;
+ /// # let result: Result<&str, Error> = Err("error");
+ /// let value = result.or::<Error>(Ok(fallback)).unwrap();
+ ///
+ /// // Option
+ /// # let option: Option<&str> = None;
+ /// let value = option.or(Some(fallback)).unwrap();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let fallback = "fallback";
+ /// // Result
+ /// # let result: Result<&str, &str> = Err("error");
+ /// let value = result.unwrap_or(fallback);
+ ///
+ /// // Option
+ /// # let option: Option<&str> = None;
+ /// let value = option.unwrap_or(fallback);
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub OR_THEN_UNWRAP,
+ complexity,
+ "checks for `.or(…).unwrap()` calls to Options and Results."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.expect(&format!(...))`, `.expect(foo(..))`,
+ /// etc., and suggests to use `unwrap_or_else` instead
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantics of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.expect(&format!("Err {}: {}", err_code, err_msg));
+ ///
+ /// // or
+ ///
+ /// # let foo = Some(String::new());
+ /// foo.expect(format!("Err {}: {}", err_code, err_msg).as_str());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.unwrap_or_else(|| panic!("Err {}: {}", err_code, err_msg));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXPECT_FUN_CALL,
+ perf,
+ "using any `expect` method with a function call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a `Copy` type.
+ ///
+ /// ### Why is this bad?
+ /// The only reason `Copy` types implement `Clone` is for
+ /// generics, not for using the `clone` method on a concrete type.
+ ///
+ /// ### Example
+ /// ```rust
+ /// 42u64.clone();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_COPY,
+ complexity,
+ "using `clone` on a `Copy` type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a ref-counted pointer,
+ /// (`Rc`, `Arc`, `rc::Weak`, or `sync::Weak`), and suggests calling Clone via unified
+ /// function syntax instead (e.g., `Rc::clone(foo)`).
+ ///
+ /// ### Why is this bad?
+ /// Calling '.clone()' on an Rc, Arc, or Weak
+ /// can obscure the fact that only the pointer is being cloned, not the underlying
+ /// data.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// let x = Rc::new(1);
+ ///
+ /// x.clone();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// # let x = Rc::new(1);
+ /// Rc::clone(&x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_REF_PTR,
+ restriction,
+ "using 'clone' on a ref-counted pointer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on an `&&T`.
+ ///
+ /// ### Why is this bad?
+ /// Cloning an `&&T` copies the inner `&T`, instead of
+ /// cloning the underlying `T`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// let x = vec![1];
+ /// let y = &&x;
+ /// let z = y.clone();
+ /// println!("{:p} {:p}", *y, z); // prints out the same pointer
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_DOUBLE_REF,
+ correctness,
+ "using `clone` on `&&T`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.to_string()` on an `&&T` where
+ /// `T` implements `ToString` directly (like `&&str` or `&&String`).
+ ///
+ /// ### Why is this bad?
+ /// This bypasses the specialized implementation of
+ /// `ToString` and instead goes through the more expensive string formatting
+ /// facilities.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Generic implementation for `T: Display` is used (slow)
+ /// ["foo", "bar"].iter().map(|s| s.to_string());
+ ///
+ /// // OK, the specialized impl is used
+ /// ["foo", "bar"].iter().map(|&s| s.to_string());
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub INEFFICIENT_TO_STRING,
+ pedantic,
+ "using `to_string` on `&&T` where `T: ToString`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `new` not returning a type that contains `Self`.
+ ///
+ /// ### Why is this bad?
+ /// As a convention, `new` methods are used to make a new
+ /// instance of a type.
+ ///
+ /// ### Example
+ /// In an impl block:
+ /// ```rust
+ /// # struct Foo;
+ /// # struct NotAFoo;
+ /// impl Foo {
+ /// fn new() -> NotAFoo {
+ /// # NotAFoo
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// struct Bar(Foo);
+ /// impl Foo {
+ /// // Bad. The type name must contain `Self`
+ /// fn new() -> Bar {
+ /// # Bar(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// # struct FooError;
+ /// impl Foo {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Result<Foo, FooError> {
+ /// # Ok(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Or in a trait definition:
+ /// ```rust
+ /// pub trait Trait {
+ /// // Bad. The type name must contain `Self`
+ /// fn new();
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// pub trait Trait {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Self;
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEW_RET_NO_SELF,
+ style,
+ "not returning type containing `Self` in a `new` method"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for string methods that receive a single-character
+ /// `str` as an argument, e.g., `_.split("x")`.
+ ///
+ /// ### Why is this bad?
+ /// Performing these methods using a `char` is faster than
+ /// using a `str`.
+ ///
+ /// ### Known problems
+ /// Does not catch multi-byte unicode characters.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// _.split("x");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// _.split('x');
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_CHAR_PATTERN,
+ perf,
+ "using a single-character str where a char could be used, e.g., `_.split(\"x\")`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calling `.step_by(0)` on iterators which panics.
+ ///
+ /// ### Why is this bad?
+ /// This very much looks like an oversight. Use `panic!()` instead if you
+ /// actually intend to panic.
+ ///
+ /// ### Example
+ /// ```rust,should_panic
+ /// for x in (0..100).step_by(0) {
+ /// //..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITERATOR_STEP_BY_ZERO,
+ correctness,
+ "using `Iterator::step_by(0)`, which will panic at runtime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for indirect collection of populated `Option`
+ ///
+ /// ### Why is this bad?
+ /// `Option` is like a collection of 0-1 things, so `flatten`
+ /// automatically does this without suspicious-looking `unwrap` calls.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().filter(Option::is_some).map(Option::unwrap);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().flatten();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub OPTION_FILTER_MAP,
+ complexity,
+ "filtering `Option` for `Some` then force-unwrapping, which can be one type-safe operation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `iter.nth(0)`.
+ ///
+ /// ### Why is this bad?
+ /// `iter.next()` is equivalent to
+ /// `iter.nth(0)`, as they both consume the next element,
+ /// but is more readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().nth(0);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().next();
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub ITER_NTH_ZERO,
+ style,
+ "replace `iter.nth(0)` with `iter.next()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.iter().nth()` (and the related
+ /// `.iter_mut().nth()`) on standard library types with *O*(1) element access.
+ ///
+ /// ### Why is this bad?
+ /// `.get()` and `.get_mut()` are more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.get(3);
+ /// let bad_slice = &some_vec[..].get(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_NTH,
+ perf,
+ "using `.iter().nth()` on a standard library type with O(1) element access"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.skip(x).next()` on iterators.
+ ///
+ /// ### Why is this bad?
+ /// `.nth(x)` is cleaner
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().skip(3).next();
+ /// let bad_slice = &some_vec[..].iter().skip(3).next();
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_SKIP_NEXT,
+ style,
+ "using `.skip(x).next()` on an iterator"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.drain(..)` on `Vec` and `VecDeque` for iteration.
+ ///
+ /// ### Why is this bad?
+ /// `.into_iter()` is simpler with better performance.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// let mut foo = vec![0, 1, 2, 3];
+ /// let bar: HashSet<usize> = foo.drain(..).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// let foo = vec![0, 1, 2, 3];
+ /// let bar: HashSet<usize> = foo.into_iter().collect();
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub ITER_WITH_DRAIN,
+ nursery,
+ "replace `.drain(..)` with `.into_iter()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `x.get(x.len() - 1)` instead of
+ /// `x.last()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `x.last()` is easier to read and has the same
+ /// result.
+ ///
+ /// Note that using `x[x.len() - 1]` is semantically different from
+ /// `x.last()`. Indexing into the array will panic on out-of-bounds
+ /// accesses, while `x.get()` and `x.last()` will return `None`.
+ ///
+ /// There is another lint (get_unwrap) that covers the case of using
+ /// `x.get(index).unwrap()` instead of `x[index]`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let last_element = x.get(x.len() - 1);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let last_element = x.last();
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub GET_LAST_WITH_LEN,
+ complexity,
+ "Using `x.get(x.len() - 1)` when `x.last()` is correct and simpler"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.get().unwrap()` (or
+ /// `.get_mut().unwrap`) on a standard library type which implements `Index`
+ ///
+ /// ### Why is this bad?
+ /// Using the Index trait (`[]`) is more clear and more
+ /// concise.
+ ///
+ /// ### Known problems
+ /// Not a replacement for error handling: Using either
+ /// `.unwrap()` or the Index trait (`[]`) carries the risk of causing a `panic`
+ /// if the value being accessed is `None`. If the use of `.get().unwrap()` is a
+ /// temporary placeholder for dealing with the `Option` type, then this does
+ /// not mitigate the need for error handling. If there is a chance that `.get()`
+ /// will be `None` in your program, then it is advisable that the `None` case
+ /// is handled in a future refactor instead of using `.unwrap()` or the Index
+ /// trait.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec.get(3).unwrap();
+ /// *some_vec.get_mut(0).unwrap() = 1;
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec[3];
+ /// some_vec[0] = 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub GET_UNWRAP,
+ restriction,
+ "using `.get().unwrap()` or `.get_mut().unwrap()` when using `[]` would work instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for occurrences where one vector gets extended instead of append
+ ///
+ /// ### Why is this bad?
+ /// Using `append` instead of `extend` is more concise and faster
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = vec![1, 2, 3];
+ /// let mut b = vec![4, 5, 6];
+ ///
+ /// a.extend(b.drain(..));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut a = vec![1, 2, 3];
+ /// let mut b = vec![4, 5, 6];
+ ///
+ /// a.append(&mut b);
+ /// ```
+ #[clippy::version = "1.55.0"]
+ pub EXTEND_WITH_DRAIN,
+ perf,
+ "using vec.append(&mut vec) to move the full range of a vector to another"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.extend(s.chars())` where s is a
+ /// `&str` or `String`.
+ ///
+ /// ### Why is this bad?
+ /// `.push_str(s)` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.extend(abc.chars());
+ /// s.extend(def.chars());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.push_str(abc);
+ /// s.push_str(&def);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_EXTEND_CHARS,
+ style,
+ "using `x.extend(s.chars())` where s is a `&str` or `String`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.cloned().collect()` on slice to
+ /// create a `Vec`.
+ ///
+ /// ### Why is this bad?
+ /// `.to_vec()` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s[..].iter().cloned().collect();
+ /// ```
+ /// The better use would be:
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s.to_vec();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_CLONED_COLLECT,
+ style,
+ "using `.cloned().collect()` on slice to create a `Vec`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.chars().last()` or
+ /// `_.chars().next_back()` on a `str` to check if it ends with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ends_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let name = "_";
+ /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-');
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let name = "_";
+ /// name.ends_with('_') || name.ends_with('-');
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_LAST_CMP,
+ style,
+ "using `.chars().last()` or `.chars().next_back()` to check if a string ends with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.as_ref()` or `.as_mut()` where the
+ /// types before and after the call are the same.
+ ///
+ /// ### Why is this bad?
+ /// The call is unnecessary.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x.as_ref());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub USELESS_ASREF,
+ complexity,
+ "using `as_ref` where the types before and after the call are the same"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `fold` when a more succinct alternative exists.
+ /// Specifically, this checks for `fold`s which could be replaced by `any`, `all`,
+ /// `sum` or `product`.
+ ///
+ /// ### Why is this bad?
+ /// Readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #[allow(unused)]
+ /// (0..3).fold(false, |acc, x| acc || x > 2);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// (0..3).any(|x| x > 2);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNNECESSARY_FOLD,
+ style,
+ "using `fold` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `filter_map` calls that could be replaced by `filter` or `map`.
+ /// More specifically it checks if the closure provided is only performing one of the
+ /// filter or map operations and suggests the appropriate option.
+ ///
+ /// ### Why is this bad?
+ /// Complexity. The intent is also clearer if only a single
+ /// operation is being performed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).filter_map(|x| if x > 2 { Some(x) } else { None });
+ ///
+ /// // As there is no transformation of the argument this could be written as:
+ /// let _ = (0..3).filter(|&x| x > 2);
+ /// ```
+ ///
+ /// ```rust
+ /// let _ = (0..4).filter_map(|x| Some(x + 1));
+ ///
+ /// // As there is no conditional check on the argument this could be written as:
+ /// let _ = (0..4).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub UNNECESSARY_FILTER_MAP,
+ complexity,
+ "using `filter_map` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `find_map` calls that could be replaced by `find` or `map`. More
+ /// specifically it checks if the closure provided is only performing one of the
+ /// find or map operations and suggests the appropriate option.
+ ///
+ /// ### Why is this bad?
+ /// Complexity. The intent is also clearer if only a single
+ /// operation is being performed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).find_map(|x| if x > 2 { Some(x) } else { None });
+ ///
+ /// // As there is no transformation of the argument this could be written as:
+ /// let _ = (0..3).find(|&x| x > 2);
+ /// ```
+ ///
+ /// ```rust
+ /// let _ = (0..4).find_map(|x| Some(x + 1));
+ ///
+ /// // As there is no conditional check on the argument this could be written as:
+ /// let _ = (0..4).map(|x| x + 1).next();
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub UNNECESSARY_FIND_MAP,
+ complexity,
+ "using `find_map` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `into_iter` calls on references which should be replaced by `iter`
+ /// or `iter_mut`.
+ ///
+ /// ### Why is this bad?
+ /// Readability. Calling `into_iter` on a reference will not move out its
+ /// content into the resulting iterator, which is confusing. It is better just call `iter` or
+ /// `iter_mut` directly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![3, 4, 5];
+ /// (&vec).into_iter();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![3, 4, 5];
+ /// (&vec).iter();
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub INTO_ITER_ON_REF,
+ style,
+ "using `.into_iter()` on a reference"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `map` followed by a `count`.
+ ///
+ /// ### Why is this bad?
+ /// It looks suspicious. Maybe `map` was confused with `filter`.
+ /// If the `map` call is intentional, this should be rewritten
+ /// using `inspect`. Or, if you intend to drive the iterator to
+ /// completion, you can just use `for_each` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).map(|x| x + 2).count();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub SUSPICIOUS_MAP,
+ suspicious,
+ "suspicious usage of map"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `MaybeUninit::uninit().assume_init()`.
+ ///
+ /// ### Why is this bad?
+ /// For most types, this is undefined behavior.
+ ///
+ /// ### Known problems
+ /// For now, we accept empty tuples and tuples / arrays
+ /// of `MaybeUninit`. There may be other types that allow uninitialized
+ /// data, but those are not yet rigorously defined.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Beware the UB
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: usize = unsafe { MaybeUninit::uninit().assume_init() };
+ /// ```
+ ///
+ /// Note that the following is OK:
+ ///
+ /// ```rust
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: [MaybeUninit<bool>; 5] = unsafe {
+ /// MaybeUninit::uninit().assume_init()
+ /// };
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub UNINIT_ASSUMED_INIT,
+ correctness,
+ "`MaybeUninit::uninit().assume_init()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.checked_add/sub(x).unwrap_or(MAX/MIN)`.
+ ///
+ /// ### Why is this bad?
+ /// These can be written simply with `saturating_add/sub` methods.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.checked_add(y).unwrap_or(u32::MAX);
+ /// let sub = x.checked_sub(y).unwrap_or(u32::MIN);
+ /// ```
+ ///
+ /// can be written using dedicated methods for saturating addition/subtraction as:
+ ///
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.saturating_add(y);
+ /// let sub = x.saturating_sub(y);
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub MANUAL_SATURATING_ARITHMETIC,
+ style,
+ "`.checked_add/sub(x).unwrap_or(MAX/MIN)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `offset(_)`, `wrapping_`{`add`, `sub`}, etc. on raw pointers to
+ /// zero-sized types
+ ///
+ /// ### Why is this bad?
+ /// This is a no-op, and likely unintended
+ ///
+ /// ### Example
+ /// ```rust
+ /// unsafe { (&() as *const ()).offset(1) };
+ /// ```
+ #[clippy::version = "1.41.0"]
+ pub ZST_OFFSET,
+ correctness,
+ "Check for offset calculations on raw pointers to zero-sized types"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `FileType::is_file()`.
+ ///
+ /// ### Why is this bad?
+ /// When people testing a file type with `FileType::is_file`
+ /// they are testing whether a path is something they can get bytes from. But
+ /// `is_file` doesn't cover special file types in unix-like systems, and doesn't cover
+ /// symlink in windows. Using `!FileType::is_dir()` is a better way to that intention.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if filetype.is_file() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ ///
+ /// should be written as:
+ ///
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if !filetype.is_dir() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub FILETYPE_IS_FILE,
+ restriction,
+ "`FileType::is_file` is not recommended to test for readable file type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.as_ref().map(Deref::deref)` or it's aliases (such as String::as_str).
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.as_deref()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_ref().map(String::as_str)
+ /// # ;
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_deref()
+ /// # ;
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub OPTION_AS_REF_DEREF,
+ complexity,
+ "using `as_ref().map(Deref::deref)`, which is more succinctly expressed as `as_deref()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `iter().next()` on a Slice or an Array
+ ///
+ /// ### Why is this bad?
+ /// These can be shortened into `.get()`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a[2..].iter().next();
+ /// b.iter().next();
+ /// ```
+ /// should be written as:
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a.get(2);
+ /// b.get(0);
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub ITER_NEXT_SLICE,
+ style,
+ "using `.iter().next()` on a sliced array, which can be shortened to just `.get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns when using `push_str`/`insert_str` with a single-character string literal
+ /// where `push`/`insert` with a `char` would work fine.
+ ///
+ /// ### Why is this bad?
+ /// It's less clear that we are pushing a single character.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let mut string = String::new();
+ /// string.insert_str(0, "R");
+ /// string.push_str("R");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let mut string = String::new();
+ /// string.insert(0, 'R');
+ /// string.push('R');
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub SINGLE_CHAR_ADD_STR,
+ style,
+ "`push_str()` or `insert_str()` used with a single-character string literal as parameter"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// As the counterpart to `or_fun_call`, this lint looks for unnecessary
+ /// lazily evaluated closures on `Option` and `Result`.
+ ///
+ /// This lint suggests changing the following functions, when eager evaluation results in
+ /// simpler code:
+ /// - `unwrap_or_else` to `unwrap_or`
+ /// - `and_then` to `and`
+ /// - `or_else` to `or`
+ /// - `get_or_insert_with` to `get_or_insert`
+ /// - `ok_or_else` to `ok_or`
+ ///
+ /// ### Why is this bad?
+ /// Using eager evaluation is shorter and simpler in some cases.
+ ///
+ /// ### Known problems
+ /// It is possible, but not recommended for `Deref` and `Index` to have
+ /// side effects. Eagerly evaluating them can change the semantics of the program.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or_else(|| 42);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or(42);
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub UNNECESSARY_LAZY_EVALUATIONS,
+ style,
+ "using unnecessary lazy evaluation, which can be replaced with simpler eager evaluation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).collect::<Result<(), _>()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `try_for_each` instead is more readable and idiomatic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).map(|t| Err(t)).collect::<Result<(), _>>();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// (0..3).try_for_each(|t| Err(t));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MAP_COLLECT_RESULT_UNIT,
+ style,
+ "using `.map(_).collect::<Result<(),_>()`, which can be replaced with `try_for_each`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `from_iter()` function calls on types that implement the `FromIterator`
+ /// trait.
+ ///
+ /// ### Why is this bad?
+ /// It is recommended style to use collect. See
+ /// [FromIterator documentation](https://doc.rust-lang.org/std/iter/trait.FromIterator.html)
+ ///
+ /// ### Example
+ /// ```rust
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v = Vec::from_iter(five_fives);
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v: Vec<i32> = five_fives.collect();
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub FROM_ITER_INSTEAD_OF_COLLECT,
+ pedantic,
+ "use `.collect()` instead of `::from_iter()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `inspect().for_each()`.
+ ///
+ /// ### Why is this bad?
+ /// It is the same as performing the computation
+ /// inside `inspect` at the beginning of the closure in `for_each`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .inspect(|&x| println!("inspect the number: {}", x))
+ /// .for_each(|&x| {
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .for_each(|&x| {
+ /// println!("inspect the number: {}", x);
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub INSPECT_FOR_EACH,
+ complexity,
+ "using `.inspect().for_each()`, which can be replaced with `.for_each()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `filter_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.filter_map(|x| x);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub FILTER_MAP_IDENTITY,
+ complexity,
+ "call to `filter_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for instances of `map(f)` where `f` is the identity function.
+ ///
+ /// ### Why is this bad?
+ /// It can be written more concisely without the call to `map`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| x).map(|x| 2*x).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| 2*x).collect();
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MAP_IDENTITY,
+ complexity,
+ "using iterator.map(|x| x)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.bytes().nth()`.
+ ///
+ /// ### Why is this bad?
+ /// `.as_bytes().get()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #[allow(unused)]
+ /// "Hello".bytes().nth(3);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # #[allow(unused)]
+ /// "Hello".as_bytes().get(3);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub BYTES_NTH,
+ style,
+ "replace `.bytes().nth()` with `.as_bytes().get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `_.to_owned()`, `vec.to_vec()`, or similar when calling `_.clone()` would be clearer.
+ ///
+ /// ### Why is this bad?
+ /// These methods do the same thing as `_.clone()` but may be confusing as
+ /// to why we are calling `to_vec` on something that is already a `Vec` or calling `to_owned` on something that is already owned.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.to_vec();
+ /// let c = a.to_owned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.clone();
+ /// let c = a.clone();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub IMPLICIT_CLONE,
+ pedantic,
+ "implicitly cloning a value by invoking a function on its dereferenced type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.iter().count()`.
+ ///
+ /// ### Why is this bad?
+ /// `.len()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// let some_vec = vec![0, 1, 2, 3];
+ ///
+ /// some_vec.iter().count();
+ /// &some_vec[..].iter().count();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ ///
+ /// some_vec.len();
+ /// &some_vec[..].len();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub ITER_COUNT,
+ complexity,
+ "replace `.iter().count()` with `.len()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `_.to_owned()`, on a `Cow<'_, _>`.
+ ///
+ /// ### Why is this bad?
+ /// Calling `to_owned()` on a `Cow` creates a clone of the `Cow`
+ /// itself, without taking ownership of the `Cow` contents (i.e.
+ /// it's equivalent to calling `Cow::clone`).
+ /// The similarly named `into_owned` method, on the other hand,
+ /// clones the `Cow` contents, effectively turning any `Cow::Borrowed`
+ /// into a `Cow::Owned`.
+ ///
+ /// Given the potential ambiguity, consider replacing `to_owned`
+ /// with `clone` for better readability or, if getting a `Cow::Owned`
+ /// was the original intent, using `into_owned` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::borrow::Cow;
+ /// let s = "Hello world!";
+ /// let cow = Cow::Borrowed(s);
+ ///
+ /// let data = cow.to_owned();
+ /// assert!(matches!(data, Cow::Borrowed(_)))
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::borrow::Cow;
+ /// let s = "Hello world!";
+ /// let cow = Cow::Borrowed(s);
+ ///
+ /// let data = cow.clone();
+ /// assert!(matches!(data, Cow::Borrowed(_)))
+ /// ```
+ /// or
+ /// ```rust
+ /// # use std::borrow::Cow;
+ /// let s = "Hello world!";
+ /// let cow = Cow::Borrowed(s);
+ ///
+ /// let data = cow.into_owned();
+ /// assert!(matches!(data, String))
+ /// ```
+ #[clippy::version = "1.65.0"]
+ pub SUSPICIOUS_TO_OWNED,
+ suspicious,
+ "calls to `to_owned` on a `Cow<'_, _>` might not do what they are expected"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to [`splitn`]
+ /// (https://doc.rust-lang.org/std/primitive.str.html#method.splitn) and
+ /// related functions with either zero or one splits.
+ ///
+ /// ### Why is this bad?
+ /// These calls don't actually split the value and are
+ /// likely to be intended as a different number.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let s = "";
+ /// for x in s.splitn(1, ":") {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let s = "";
+ /// for x in s.splitn(2, ":") {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub SUSPICIOUS_SPLITN,
+ correctness,
+ "checks for `.splitn(0, ..)` and `.splitn(1, ..)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for manual implementations of `str::repeat`
+ ///
+ /// ### Why is this bad?
+ /// These are both harder to read, as well as less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: String = std::iter::repeat('x').take(10).collect();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x: String = "x".repeat(10);
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub MANUAL_STR_REPEAT,
+ perf,
+ "manual implementation of `str::repeat`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn(2, _)`
+ ///
+ /// ### Why is this bad?
+ /// `split_once` is both clearer in intent and slightly more efficient.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let s = "key=value=add";
+ /// let (key, value) = s.splitn(2, '=').next_tuple()?;
+ /// let value = s.splitn(2, '=').nth(1)?;
+ ///
+ /// let mut parts = s.splitn(2, '=');
+ /// let key = parts.next()?;
+ /// let value = parts.next()?;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// let s = "key=value=add";
+ /// let (key, value) = s.split_once('=')?;
+ /// let value = s.split_once('=')?.1;
+ ///
+ /// let (key, value) = s.split_once('=')?;
+ /// ```
+ ///
+ /// ### Limitations
+ /// The multiple statement variant currently only detects `iter.next()?`/`iter.next().unwrap()`
+ /// in two separate `let` statements that immediately follow the `splitn()`
+ #[clippy::version = "1.57.0"]
+ pub MANUAL_SPLIT_ONCE,
+ complexity,
+ "replace `.splitn(2, pat)` with `.split_once(pat)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn` (or `str::rsplitn`) where using `str::split` would be the same.
+ /// ### Why is this bad?
+ /// The function `split` is simpler and there is no performance difference in these cases, considering
+ /// that both functions return a lazy iterator.
+ /// ### Example
+ /// ```rust
+ /// let str = "key=value=add";
+ /// let _ = str.splitn(3, '=').next().unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let str = "key=value=add";
+ /// let _ = str.split('=').next().unwrap();
+ /// ```
+ #[clippy::version = "1.59.0"]
+ pub NEEDLESS_SPLITN,
+ complexity,
+ "usages of `str::splitn` that can be replaced with `str::split`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary calls to [`ToOwned::to_owned`](https://doc.rust-lang.org/std/borrow/trait.ToOwned.html#tymethod.to_owned)
+ /// and other `to_owned`-like functions.
+ ///
+ /// ### Why is this bad?
+ /// The unnecessary calls result in useless allocations.
+ ///
+ /// ### Known problems
+ /// `unnecessary_to_owned` can falsely trigger if `IntoIterator::into_iter` is applied to an
+ /// owned copy of a resource and the resource is later used mutably. See
+ /// [#8148](https://github.com/rust-lang/rust-clippy/issues/8148).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy().to_string());
+ /// fn foo(s: &str) {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy());
+ /// fn foo(s: &str) {}
+ /// ```
+ #[clippy::version = "1.59.0"]
+ pub UNNECESSARY_TO_OWNED,
+ perf,
+ "unnecessary calls to `to_owned`-like functions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.collect::<Vec<String>>().join("")` on iterators.
+ ///
+ /// ### Why is this bad?
+ /// `.collect::<String>()` is more concise and might be more performant
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vector = vec!["hello", "world"];
+ /// let output = vector.iter().map(|item| item.to_uppercase()).collect::<Vec<String>>().join("");
+ /// println!("{}", output);
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let vector = vec!["hello", "world"];
+ /// let output = vector.iter().map(|item| item.to_uppercase()).collect::<String>();
+ /// println!("{}", output);
+ /// ```
+ /// ### Known problems
+ /// While `.collect::<String>()` is sometimes more performant, there are cases where
+ /// using `.collect::<String>()` over `.collect::<Vec<String>>().join("")`
+ /// will prevent loop unrolling and will result in a negative performance impact.
+ ///
+ /// Additionally, differences have been observed between aarch64 and x86_64 assembly output,
+ /// with aarch64 tending to producing faster assembly in more cases when using `.collect::<String>()`
+ #[clippy::version = "1.61.0"]
+ pub UNNECESSARY_JOIN,
+ pedantic,
+ "using `.collect::<Vec<String>>().join(\"\")` on an iterator"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for no-op uses of `Option::{as_deref, as_deref_mut}`,
+ /// for example, `Option<&T>::as_deref()` returns the same type.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code and improving readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a.as_deref(); // goes from Option<&i32> to Option<&i32>
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a;
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub NEEDLESS_OPTION_AS_DEREF,
+ complexity,
+ "no-op use of `deref` or `deref_mut` method to `Option`."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds usages of [`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) that
+ /// can be replaced with [`is_ascii_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_digit) or
+ /// [`is_ascii_hexdigit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_hexdigit).
+ ///
+ /// ### Why is this bad?
+ /// `is_digit(..)` is slower and requires specifying the radix.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_digit(10);
+ /// c.is_digit(16);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_ascii_digit();
+ /// c.is_ascii_hexdigit();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub IS_DIGIT_ASCII_RADIX,
+ style,
+ "use of `char::is_digit(..)` with literal radix of 10 or 16"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calling `take` function after `as_ref`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code. `take` writes `None` to its argument.
+ /// In this case the modification is useless as it's a temporary that cannot be read from afterwards.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(3);
+ /// x.as_ref().take();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = Some(3);
+ /// x.as_ref();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub NEEDLESS_OPTION_TAKE,
+ complexity,
+ "using `.as_ref().take()` on a temporary value"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `replace` statements which have no effect.
+ ///
+ /// ### Why is this bad?
+ /// It's either a mistake or confusing.
+ ///
+ /// ### Example
+ /// ```rust
+ /// "1234".replace("12", "12");
+ /// "1234".replacen("12", "12", 1);
+ /// ```
+ #[clippy::version = "1.63.0"]
+ pub NO_EFFECT_REPLACE,
+ suspicious,
+ "replace with no effect"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `.then_some(..).unwrap_or(..)`
+ ///
+ /// ### Why is this bad?
+ /// This can be written more clearly with `if .. else ..`
+ ///
+ /// ### Limitations
+ /// This lint currently only looks for usages of
+ /// `.then_some(..).unwrap_or(..)`, but will be expanded
+ /// to account for similar patterns.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = true;
+ /// x.then_some("a").unwrap_or("b");
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = true;
+ /// if x { "a" } else { "b" };
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub OBFUSCATED_IF_ELSE,
+ style,
+ "use of `.then_some(..).unwrap_or(..)` can be written \
+ more clearly with `if .. else ..`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks for calls to `iter`, `iter_mut` or `into_iter` on collections containing a single item
+ ///
+ /// ### Why is this bad?
+ ///
+ /// It is simpler to use the once function from the standard library:
+ ///
+ /// ### Example
+ ///
+ /// ```rust
+ /// let a = [123].iter();
+ /// let b = Some(123).into_iter();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use std::iter;
+ /// let a = iter::once(&123);
+ /// let b = iter::once(123);
+ /// ```
+ ///
+ /// ### Known problems
+ ///
+ /// The type of the resulting iterator might become incompatible with its usage
+ #[clippy::version = "1.64.0"]
+ pub ITER_ON_SINGLE_ITEMS,
+ nursery,
+ "Iterator for array of length 1"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks for calls to `iter`, `iter_mut` or `into_iter` on empty collections
+ ///
+ /// ### Why is this bad?
+ ///
+ /// It is simpler to use the empty function from the standard library:
+ ///
+ /// ### Example
+ ///
+ /// ```rust
+ /// use std::{slice, option};
+ /// let a: slice::Iter<i32> = [].iter();
+ /// let f: option::IntoIter<i32> = None.into_iter();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use std::iter;
+ /// let a: iter::Empty<i32> = iter::empty();
+ /// let b: iter::Empty<i32> = iter::empty();
+ /// ```
+ ///
+ /// ### Known problems
+ ///
+ /// The type of the resulting iterator might become incompatible with its usage
+ #[clippy::version = "1.64.0"]
+ pub ITER_ON_EMPTY_COLLECTIONS,
+ nursery,
+ "Iterator for empty array"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for naive byte counts
+ ///
+ /// ### Why is this bad?
+ /// The [`bytecount`](https://crates.io/crates/bytecount)
+ /// crate has methods to count your bytes faster, especially for large slices.
+ ///
+ /// ### Known problems
+ /// If you have predominantly small slices, the
+ /// `bytecount::count(..)` method may actually be slower. However, if you can
+ /// ensure that less than 2³²-1 matches arise, the `naive_count_32(..)` can be
+ /// faster in those cases.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1_u8];
+ /// let count = vec.iter().filter(|x| **x == 0u8).count();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// # let vec = vec![1_u8];
+ /// let count = bytecount::count(&vec, 0u8);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NAIVE_BYTECOUNT,
+ pedantic,
+ "use of naive `<slice>.filter(|&x| x == y).count()` to count byte values"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// It checks for `str::bytes().count()` and suggests replacing it with
+ /// `str::len()`.
+ ///
+ /// ### Why is this bad?
+ /// `str::bytes().count()` is longer and may not be as performant as using
+ /// `str::len()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// "hello".bytes().count();
+ /// String::from("hello").bytes().count();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// "hello".len();
+ /// String::from("hello").len();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub BYTES_COUNT_TO_LEN,
+ complexity,
+ "Using `bytes().count()` when `len()` performs the same functionality"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `ends_with` with possible file extensions
+ /// and suggests to use a case-insensitive approach instead.
+ ///
+ /// ### Why is this bad?
+ /// `ends_with` is case-sensitive and may not detect files with a valid extension.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn is_rust_file(filename: &str) -> bool {
+ /// filename.ends_with(".rs")
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn is_rust_file(filename: &str) -> bool {
+ /// let filename = std::path::Path::new(filename);
+ /// filename.extension()
+ /// .map_or(false, |ext| ext.eq_ignore_ascii_case("rs"))
+ /// }
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ pedantic,
+ "Checks for calls to ends_with with case-sensitive file extensions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `x.get(0)` instead of
+ /// `x.first()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `x.first()` is easier to read and has the same
+ /// result.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let first_element = x.get(0);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let first_element = x.first();
+ /// ```
+ #[clippy::version = "1.63.0"]
+ pub GET_FIRST,
+ style,
+ "Using `x.get(0)` when `x.first()` is simpler"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Finds patterns that reimplement `Option::ok_or`.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Concise code helps focusing on behavior instead of boilerplate.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.map_or(Err("error"), |v| Ok(v));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.ok_or("error");
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_OK_OR,
+ pedantic,
+ "finds patterns that can be encoded more concisely with `Option::ok_or`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `map(|x| x.clone())` or
+ /// dereferencing closures for `Copy` types, on `Iterator` or `Option`,
+ /// and suggests `cloned()` or `copied()` instead
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = vec![42, 43];
+ /// let y = x.iter();
+ /// let z = y.map(|i| *i);
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// let x = vec![42, 43];
+ /// let y = x.iter();
+ /// let z = y.cloned();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MAP_CLONE,
+ style,
+ "using `iterator.map(|x| x.clone())`, or dereferencing closures for `Copy` types"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for instances of `map_err(|_| Some::Enum)`
+ ///
+ /// ### Why is this bad?
+ /// This `map_err` throws away the original error rather than allowing the enum to contain and report the cause of the error
+ ///
+ /// ### Example
+ /// Before:
+ /// ```rust
+ /// use std::fmt;
+ ///
+ /// #[derive(Debug)]
+ /// enum Error {
+ /// Indivisible,
+ /// Remainder(u8),
+ /// }
+ ///
+ /// impl fmt::Display for Error {
+ /// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ /// match self {
+ /// Error::Indivisible => write!(f, "could not divide input by three"),
+ /// Error::Remainder(remainder) => write!(
+ /// f,
+ /// "input is not divisible by three, remainder = {}",
+ /// remainder
+ /// ),
+ /// }
+ /// }
+ /// }
+ ///
+ /// impl std::error::Error for Error {}
+ ///
+ /// fn divisible_by_3(input: &str) -> Result<(), Error> {
+ /// input
+ /// .parse::<i32>()
+ /// .map_err(|_| Error::Indivisible)
+ /// .map(|v| v % 3)
+ /// .and_then(|remainder| {
+ /// if remainder == 0 {
+ /// Ok(())
+ /// } else {
+ /// Err(Error::Remainder(remainder as u8))
+ /// }
+ /// })
+ /// }
+ /// ```
+ ///
+ /// After:
+ /// ```rust
+ /// use std::{fmt, num::ParseIntError};
+ ///
+ /// #[derive(Debug)]
+ /// enum Error {
+ /// Indivisible(ParseIntError),
+ /// Remainder(u8),
+ /// }
+ ///
+ /// impl fmt::Display for Error {
+ /// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ /// match self {
+ /// Error::Indivisible(_) => write!(f, "could not divide input by three"),
+ /// Error::Remainder(remainder) => write!(
+ /// f,
+ /// "input is not divisible by three, remainder = {}",
+ /// remainder
+ /// ),
+ /// }
+ /// }
+ /// }
+ ///
+ /// impl std::error::Error for Error {
+ /// fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+ /// match self {
+ /// Error::Indivisible(source) => Some(source),
+ /// _ => None,
+ /// }
+ /// }
+ /// }
+ ///
+ /// fn divisible_by_3(input: &str) -> Result<(), Error> {
+ /// input
+ /// .parse::<i32>()
+ /// .map_err(Error::Indivisible)
+ /// .map(|v| v % 3)
+ /// .and_then(|remainder| {
+ /// if remainder == 0 {
+ /// Ok(())
+ /// } else {
+ /// Err(Error::Remainder(remainder as u8))
+ /// }
+ /// })
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub MAP_ERR_IGNORE,
+ restriction,
+ "`map_err` should not ignore the original error"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `&mut Mutex::lock` calls
+ ///
+ /// ### Why is this bad?
+ /// `Mutex::lock` is less efficient than
+ /// calling `Mutex::get_mut`. In addition you also have a statically
+ /// guarantee that the mutex isn't locked, instead of just a runtime
+ /// guarantee.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::sync::{Arc, Mutex};
+ ///
+ /// let mut value_rc = Arc::new(Mutex::new(42_u8));
+ /// let value_mutex = Arc::get_mut(&mut value_rc).unwrap();
+ ///
+ /// let mut value = value_mutex.lock().unwrap();
+ /// *value += 1;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use std::sync::{Arc, Mutex};
+ ///
+ /// let mut value_rc = Arc::new(Mutex::new(42_u8));
+ /// let value_mutex = Arc::get_mut(&mut value_rc).unwrap();
+ ///
+ /// let value = value_mutex.get_mut().unwrap();
+ /// *value += 1;
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MUT_MUTEX_LOCK,
+ style,
+ "`&mut Mutex::lock` does unnecessary locking"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for duplicate open options as well as combinations
+ /// that make no sense.
+ ///
+ /// ### Why is this bad?
+ /// In the best case, the code will be harder to read than
+ /// necessary. I don't know the worst case.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::fs::OpenOptions;
+ ///
+ /// OpenOptions::new().read(true).truncate(true);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NONSENSICAL_OPEN_OPTIONS,
+ correctness,
+ "nonsensical combination of options for opening a file"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///* Checks for [push](https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.push)
+ /// calls on `PathBuf` that can cause overwrites.
+ ///
+ /// ### Why is this bad?
+ /// Calling `push` with a root path at the start can overwrite the
+ /// previous defined path.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::path::PathBuf;
+ ///
+ /// let mut x = PathBuf::from("/foo");
+ /// x.push("/bar");
+ /// assert_eq!(x, PathBuf::from("/bar"));
+ /// ```
+ /// Could be written:
+ ///
+ /// ```rust
+ /// use std::path::PathBuf;
+ ///
+ /// let mut x = PathBuf::from("/foo");
+ /// x.push("bar");
+ /// assert_eq!(x, PathBuf::from("/foo/bar"));
+ /// ```
+ #[clippy::version = "1.36.0"]
+ pub PATH_BUF_PUSH_OVERWRITE,
+ nursery,
+ "calling `push` with file system root on `PathBuf` can overwrite it"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for zipping a collection with the range of
+ /// `0.._.len()`.
+ ///
+ /// ### Why is this bad?
+ /// The code is better expressed with `.enumerate()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = vec![1];
+ /// let _ = x.iter().zip(0..x.len());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = vec![1];
+ /// let _ = x.iter().enumerate();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_ZIP_WITH_LEN,
+ complexity,
+ "zipping iterator with a range when `enumerate()` would do"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.repeat(1)` and suggest the following method for each types.
+ /// - `.to_string()` for `str`
+ /// - `.clone()` for `String`
+ /// - `.to_vec()` for `slice`
+ ///
+ /// The lint will evaluate constant expressions and values as arguments of `.repeat(..)` and emit a message if
+ /// they are equivalent to `1`. (Related discussion in [rust-clippy#7306](https://github.com/rust-lang/rust-clippy/issues/7306))
+ ///
+ /// ### Why is this bad?
+ /// For example, `String.repeat(1)` is equivalent to `.clone()`. If cloning
+ /// the string is the intention behind this, `clone()` should be used.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// let x = String::from("hello world").repeat(1);
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// let x = String::from("hello world").clone();
+ /// }
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub REPEAT_ONCE,
+ complexity,
+ "using `.repeat(1)` instead of `String.clone()`, `str.to_string()` or `slice.to_vec()` "
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// When sorting primitive values (integers, bools, chars, as well
+ /// as arrays, slices, and tuples of such items), it is typically better to
+ /// use an unstable sort than a stable sort.
+ ///
+ /// ### Why is this bad?
+ /// Typically, using a stable sort consumes more memory and cpu cycles.
+ /// Because values which compare equal are identical, preserving their
+ /// relative order (the guarantee that a stable sort provides) means
+ /// nothing, while the extra costs still apply.
+ ///
+ /// ### Known problems
+ ///
+ /// As pointed out in
+ /// [issue #8241](https://github.com/rust-lang/rust-clippy/issues/8241),
+ /// a stable sort can instead be significantly faster for certain scenarios
+ /// (eg. when a sorted vector is extended with new data and resorted).
+ ///
+ /// For more information and benchmarking results, please refer to the
+ /// issue linked above.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut vec = vec![2, 1, 3];
+ /// vec.sort();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let mut vec = vec![2, 1, 3];
+ /// vec.sort_unstable();
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub STABLE_SORT_PRIMITIVE,
+ pedantic,
+ "use of sort() when sort_unstable() is equivalent"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects `().hash(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Hashing a unit value doesn't do anything as the implementation of `Hash` for `()` is a no-op.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::hash::Hash;
+ /// # use std::collections::hash_map::DefaultHasher;
+ /// # enum Foo { Empty, WithValue(u8) }
+ /// # use Foo::*;
+ /// # let mut state = DefaultHasher::new();
+ /// # let my_enum = Foo::Empty;
+ /// match my_enum {
+ /// Empty => ().hash(&mut state),
+ /// WithValue(x) => x.hash(&mut state),
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::hash::Hash;
+ /// # use std::collections::hash_map::DefaultHasher;
+ /// # enum Foo { Empty, WithValue(u8) }
+ /// # use Foo::*;
+ /// # let mut state = DefaultHasher::new();
+ /// # let my_enum = Foo::Empty;
+ /// match my_enum {
+ /// Empty => 0_u8.hash(&mut state),
+ /// WithValue(x) => x.hash(&mut state),
+ /// }
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub UNIT_HASH,
+ correctness,
+ "hashing a unit value, which does nothing"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects uses of `Vec::sort_by` passing in a closure
+ /// which compares the two arguments, either directly or indirectly.
+ ///
+ /// ### Why is this bad?
+ /// It is more clear to use `Vec::sort_by_key` (or `Vec::sort` if
+ /// possible) than to use `Vec::sort_by` and a more complicated
+ /// closure.
+ ///
+ /// ### Known problems
+ /// If the suggested `Vec::sort_by_key` uses Reverse and it isn't already
+ /// imported by a use statement, then it will need to be added manually.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct A;
+ /// # impl A { fn foo(&self) {} }
+ /// # let mut vec: Vec<A> = Vec::new();
+ /// vec.sort_by(|a, b| a.foo().cmp(&b.foo()));
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # struct A;
+ /// # impl A { fn foo(&self) {} }
+ /// # let mut vec: Vec<A> = Vec::new();
+ /// vec.sort_by_key(|a| a.foo());
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub UNNECESSARY_SORT_BY,
+ complexity,
+ "Use of `Vec::sort_by` when `Vec::sort_by_key` or `Vec::sort` would be clearer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds occurrences of `Vec::resize(0, an_int)`
+ ///
+ /// ### Why is this bad?
+ /// This is probably an argument inversion mistake.
+ ///
+ /// ### Example
+ /// ```rust
+ /// vec!(1, 2, 3, 4, 5).resize(0, 5)
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// vec!(1, 2, 3, 4, 5).clear()
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub VEC_RESIZE_TO_ZERO,
+ correctness,
+ "emptying a vector with `resize(0, an_int)` instead of `clear()` is probably an argument inversion mistake"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of File::read_to_end and File::read_to_string.
+ ///
+ /// ### Why is this bad?
+ /// `fs::{read, read_to_string}` provide the same functionality when `buf` is empty with fewer imports and no intermediate values.
+ /// See also: [fs::read docs](https://doc.rust-lang.org/std/fs/fn.read.html), [fs::read_to_string docs](https://doc.rust-lang.org/std/fs/fn.read_to_string.html)
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// # use std::io::Read;
+ /// # use std::fs::File;
+ /// let mut f = File::open("foo.txt").unwrap();
+ /// let mut bytes = Vec::new();
+ /// f.read_to_end(&mut bytes).unwrap();
+ /// ```
+ /// Can be written more concisely as
+ /// ```rust,no_run
+ /// # use std::fs;
+ /// let mut bytes = fs::read("foo.txt").unwrap();
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub VERBOSE_FILE_READS,
+ restriction,
+ "use of `File::read_to_end` or `File::read_to_string`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks for iterating a map (`HashMap` or `BTreeMap`) and
+ /// ignoring either the keys or values.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Readability. There are `keys` and `values` methods that
+ /// can be used to express that we only need the keys or the values.
+ ///
+ /// ### Example
+ ///
+ /// ```
+ /// # use std::collections::HashMap;
+ /// let map: HashMap<u32, u32> = HashMap::new();
+ /// let values = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```
+ /// # use std::collections::HashMap;
+ /// let map: HashMap<u32, u32> = HashMap::new();
+ /// let values = map.values().collect::<Vec<_>>();
+ /// ```
+ #[clippy::version = "1.65.0"]
+ pub ITER_KV_MAP,
+ complexity,
+ "iterating on map using `iter` when `keys` or `values` would do"
+}
+
+pub struct Methods {
+ avoid_breaking_exported_api: bool,
+ msrv: Option<RustcVersion>,
+ allow_expect_in_tests: bool,
+ allow_unwrap_in_tests: bool,
+}
+
+impl Methods {
+ #[must_use]
+ pub fn new(
+ avoid_breaking_exported_api: bool,
+ msrv: Option<RustcVersion>,
+ allow_expect_in_tests: bool,
+ allow_unwrap_in_tests: bool,
+ ) -> Self {
+ Self {
+ avoid_breaking_exported_api,
+ msrv,
+ allow_expect_in_tests,
+ allow_unwrap_in_tests,
+ }
+ }
+}
+
+impl_lint_pass!(Methods => [
+ UNWRAP_USED,
+ EXPECT_USED,
+ SHOULD_IMPLEMENT_TRAIT,
+ WRONG_SELF_CONVENTION,
+ OK_EXPECT,
+ UNWRAP_OR_ELSE_DEFAULT,
+ MAP_UNWRAP_OR,
+ RESULT_MAP_OR_INTO_OPTION,
+ OPTION_MAP_OR_NONE,
+ BIND_INSTEAD_OF_MAP,
+ OR_FUN_CALL,
+ OR_THEN_UNWRAP,
+ EXPECT_FUN_CALL,
+ CHARS_NEXT_CMP,
+ CHARS_LAST_CMP,
+ CLONE_ON_COPY,
+ CLONE_ON_REF_PTR,
+ CLONE_DOUBLE_REF,
+ COLLAPSIBLE_STR_REPLACE,
+ ITER_OVEREAGER_CLONED,
+ CLONED_INSTEAD_OF_COPIED,
+ FLAT_MAP_OPTION,
+ INEFFICIENT_TO_STRING,
+ NEW_RET_NO_SELF,
+ SINGLE_CHAR_PATTERN,
+ SINGLE_CHAR_ADD_STR,
+ SEARCH_IS_SOME,
+ FILTER_NEXT,
+ SKIP_WHILE_NEXT,
+ FILTER_MAP_IDENTITY,
+ MAP_IDENTITY,
+ MANUAL_FILTER_MAP,
+ MANUAL_FIND_MAP,
+ OPTION_FILTER_MAP,
+ FILTER_MAP_NEXT,
+ FLAT_MAP_IDENTITY,
+ MAP_FLATTEN,
+ ITERATOR_STEP_BY_ZERO,
+ ITER_NEXT_SLICE,
+ ITER_COUNT,
+ ITER_NTH,
+ ITER_NTH_ZERO,
+ BYTES_NTH,
+ ITER_SKIP_NEXT,
+ GET_UNWRAP,
+ GET_LAST_WITH_LEN,
+ STRING_EXTEND_CHARS,
+ ITER_CLONED_COLLECT,
+ ITER_WITH_DRAIN,
+ USELESS_ASREF,
+ UNNECESSARY_FOLD,
+ UNNECESSARY_FILTER_MAP,
+ UNNECESSARY_FIND_MAP,
+ INTO_ITER_ON_REF,
+ SUSPICIOUS_MAP,
+ UNINIT_ASSUMED_INIT,
+ MANUAL_SATURATING_ARITHMETIC,
+ ZST_OFFSET,
+ FILETYPE_IS_FILE,
+ OPTION_AS_REF_DEREF,
+ UNNECESSARY_LAZY_EVALUATIONS,
+ MAP_COLLECT_RESULT_UNIT,
+ FROM_ITER_INSTEAD_OF_COLLECT,
+ INSPECT_FOR_EACH,
+ IMPLICIT_CLONE,
+ SUSPICIOUS_TO_OWNED,
+ SUSPICIOUS_SPLITN,
+ MANUAL_STR_REPEAT,
+ EXTEND_WITH_DRAIN,
+ MANUAL_SPLIT_ONCE,
+ NEEDLESS_SPLITN,
+ UNNECESSARY_TO_OWNED,
+ UNNECESSARY_JOIN,
+ ERR_EXPECT,
+ NEEDLESS_OPTION_AS_DEREF,
+ IS_DIGIT_ASCII_RADIX,
+ NEEDLESS_OPTION_TAKE,
+ NO_EFFECT_REPLACE,
+ OBFUSCATED_IF_ELSE,
+ ITER_ON_SINGLE_ITEMS,
+ ITER_ON_EMPTY_COLLECTIONS,
+ NAIVE_BYTECOUNT,
+ BYTES_COUNT_TO_LEN,
+ CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ GET_FIRST,
+ MANUAL_OK_OR,
+ MAP_CLONE,
+ MAP_ERR_IGNORE,
+ MUT_MUTEX_LOCK,
+ NONSENSICAL_OPEN_OPTIONS,
+ PATH_BUF_PUSH_OVERWRITE,
+ RANGE_ZIP_WITH_LEN,
+ REPEAT_ONCE,
+ STABLE_SORT_PRIMITIVE,
+ UNIT_HASH,
+ UNNECESSARY_SORT_BY,
+ VEC_RESIZE_TO_ZERO,
+ VERBOSE_FILE_READS,
+ ITER_KV_MAP,
+]);
+
+/// Extracts a method call name, args, and `Span` of the method name.
+fn method_call<'tcx>(
+ recv: &'tcx hir::Expr<'tcx>,
+) -> Option<(&'tcx str, &'tcx hir::Expr<'tcx>, &'tcx [hir::Expr<'tcx>], Span)> {
+ if let ExprKind::MethodCall(path, receiver, args, _) = recv.kind {
+ if !args.iter().any(|e| e.span.from_expansion()) && !receiver.span.from_expansion() {
+ let name = path.ident.name.as_str();
+ return Some((name, receiver, args, path.ident.span));
+ }
+ }
+ None
+}
+
+impl<'tcx> LateLintPass<'tcx> for Methods {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ self.check_methods(cx, expr);
+
+ match expr.kind {
+ hir::ExprKind::Call(func, args) => {
+ from_iter_instead_of_collect::check(cx, expr, args, func);
+ },
+ hir::ExprKind::MethodCall(method_call, receiver, args, _) => {
+ let method_span = method_call.ident.span;
+ or_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), receiver, args);
+ expect_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), receiver, args);
+ clone_on_copy::check(cx, expr, method_call.ident.name, receiver, args);
+ clone_on_ref_ptr::check(cx, expr, method_call.ident.name, receiver, args);
+ inefficient_to_string::check(cx, expr, method_call.ident.name, receiver, args);
+ single_char_add_str::check(cx, expr, receiver, args);
+ into_iter_on_ref::check(cx, expr, method_span, method_call.ident.name, receiver);
+ single_char_pattern::check(cx, expr, method_call.ident.name, receiver, args);
+ unnecessary_to_owned::check(cx, expr, method_call.ident.name, receiver, args, self.msrv);
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) if op.node == hir::BinOpKind::Eq || op.node == hir::BinOpKind::Ne => {
+ let mut info = BinaryExprInfo {
+ expr,
+ chain: lhs,
+ other: rhs,
+ eq: op.node == hir::BinOpKind::Eq,
+ };
+ lint_binary_expr_with_method_call(cx, &mut info);
+ },
+ _ => (),
+ }
+ }
+
+ #[allow(clippy::too_many_lines)]
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
+ if in_external_macro(cx.sess(), impl_item.span) {
+ return;
+ }
+ let name = impl_item.ident.name.as_str();
+ let parent = cx.tcx.hir().get_parent_item(impl_item.hir_id()).def_id;
+ let item = cx.tcx.hir().expect_item(parent);
+ let self_ty = cx.tcx.type_of(item.def_id);
+
+ let implements_trait = matches!(item.kind, hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }));
+ if let hir::ImplItemKind::Fn(ref sig, id) = impl_item.kind {
+ let method_sig = cx.tcx.fn_sig(impl_item.def_id);
+ let method_sig = cx.tcx.erase_late_bound_regions(method_sig);
+ let first_arg_ty_opt = method_sig.inputs().iter().next().copied();
+ // if this impl block implements a trait, lint in trait definition instead
+ if !implements_trait && cx.access_levels.is_exported(impl_item.def_id.def_id) {
+ // check missing trait implementations
+ for method_config in &TRAIT_METHODS {
+ if name == method_config.method_name
+ && sig.decl.inputs.len() == method_config.param_count
+ && method_config.output_type.matches(&sig.decl.output)
+ // in case there is no first arg, since we already have checked the number of arguments
+ // it's should be always true
+ && first_arg_ty_opt.map_or(true, |first_arg_ty| method_config
+ .self_kind.matches(cx, self_ty, first_arg_ty)
+ )
+ && fn_header_equals(method_config.fn_header, sig.header)
+ && method_config.lifetime_param_cond(impl_item)
+ {
+ span_lint_and_help(
+ cx,
+ SHOULD_IMPLEMENT_TRAIT,
+ impl_item.span,
+ &format!(
+ "method `{}` can be confused for the standard trait method `{}::{}`",
+ method_config.method_name, method_config.trait_name, method_config.method_name
+ ),
+ None,
+ &format!(
+ "consider implementing the trait `{}` or choosing a less ambiguous method name",
+ method_config.trait_name
+ ),
+ );
+ }
+ }
+ }
+
+ if sig.decl.implicit_self.has_implicit_self()
+ && !(self.avoid_breaking_exported_api
+ && cx.access_levels.is_exported(impl_item.def_id.def_id))
+ && let Some(first_arg) = iter_input_pats(sig.decl, cx.tcx.hir().body(id)).next()
+ && let Some(first_arg_ty) = first_arg_ty_opt
+ {
+ wrong_self_convention::check(
+ cx,
+ name,
+ self_ty,
+ first_arg_ty,
+ first_arg.pat.span,
+ implements_trait,
+ false
+ );
+ }
+ }
+
+ // if this impl block implements a trait, lint in trait definition instead
+ if implements_trait {
+ return;
+ }
+
+ if let hir::ImplItemKind::Fn(_, _) = impl_item.kind {
+ let ret_ty = return_ty(cx, impl_item.hir_id());
+
+ // walk the return type and check for Self (this does not check associated types)
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(ret_ty, self_adt) {
+ return;
+ }
+ } else if ret_ty.contains(self_ty) {
+ return;
+ }
+
+ // if return type is impl trait, check the associated types
+ if let ty::Opaque(def_id, _) = *ret_ty.kind() {
+ // one of the associated types must be Self
+ for &(predicate, _span) in cx.tcx.explicit_item_bounds(def_id) {
+ if let ty::PredicateKind::Projection(projection_predicate) = predicate.kind().skip_binder() {
+ let assoc_ty = match projection_predicate.term.unpack() {
+ ty::TermKind::Ty(ty) => ty,
+ ty::TermKind::Const(_c) => continue,
+ };
+ // walk the associated type and check for Self
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(assoc_ty, self_adt) {
+ return;
+ }
+ } else if assoc_ty.contains(self_ty) {
+ return;
+ }
+ }
+ }
+ }
+
+ if name == "new" && ret_ty != self_ty {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ impl_item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if in_external_macro(cx.tcx.sess, item.span) {
+ return;
+ }
+
+ if_chain! {
+ if let TraitItemKind::Fn(ref sig, _) = item.kind;
+ if sig.decl.implicit_self.has_implicit_self();
+ if let Some(first_arg_ty) = sig.decl.inputs.iter().next();
+
+ then {
+ let first_arg_span = first_arg_ty.span;
+ let first_arg_ty = hir_ty_to_ty(cx.tcx, first_arg_ty);
- true
++ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id())
++ .self_ty()
++ .skip_binder();
+ wrong_self_convention::check(
+ cx,
+ item.ident.name.as_str(),
+ self_ty,
+ first_arg_ty,
+ first_arg_span,
+ false,
- let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
++ true,
+ );
+ }
+ }
+
+ if_chain! {
+ if item.ident.name == sym::new;
+ if let TraitItemKind::Fn(_, _) = item.kind;
+ let ret_ty = return_ty(cx, item.hir_id());
- let trait_path = match mutability {
- hir::Mutability::Not => &paths::ASREF_TRAIT,
- hir::Mutability::Mut => &paths::ASMUT_TRAIT,
++ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id())
++ .self_ty()
++ .skip_binder();
+ if !ret_ty.contains(self_ty);
+
+ then {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+impl Methods {
+ #[allow(clippy::too_many_lines)]
+ fn check_methods<'tcx>(&self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let Some((name, recv, args, span)) = method_call(expr) {
+ match (name, args) {
+ ("add" | "offset" | "sub" | "wrapping_offset" | "wrapping_add" | "wrapping_sub", [_arg]) => {
+ zst_offset::check(cx, expr, recv);
+ },
+ ("and_then", [arg]) => {
+ let biom_option_linted = bind_instead_of_map::OptionAndThenSome::check(cx, expr, recv, arg);
+ let biom_result_linted = bind_instead_of_map::ResultAndThenOk::check(cx, expr, recv, arg);
+ if !biom_option_linted && !biom_result_linted {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "and");
+ }
+ },
+ ("as_deref" | "as_deref_mut", []) => {
+ needless_option_as_deref::check(cx, expr, recv, name);
+ },
+ ("as_mut", []) => useless_asref::check(cx, expr, "as_mut", recv),
+ ("as_ref", []) => useless_asref::check(cx, expr, "as_ref", recv),
+ ("assume_init", []) => uninit_assumed_init::check(cx, expr, recv),
+ ("cloned", []) => cloned_instead_of_copied::check(cx, expr, recv, span, self.msrv),
+ ("collect", []) => match method_call(recv) {
+ Some((name @ ("cloned" | "copied"), recv2, [], _)) => {
+ iter_cloned_collect::check(cx, name, expr, recv2);
+ },
+ Some(("map", m_recv, [m_arg], _)) => {
+ map_collect_result_unit::check(cx, expr, m_recv, m_arg, recv);
+ },
+ Some(("take", take_self_arg, [take_arg], _)) => {
+ if meets_msrv(self.msrv, msrvs::STR_REPEAT) {
+ manual_str_repeat::check(cx, expr, recv, take_self_arg, take_arg);
+ }
+ },
+ _ => {},
+ },
+ ("count", []) if is_trait_method(cx, expr, sym::Iterator) => match method_call(recv) {
+ Some(("cloned", recv2, [], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, true, false),
+ Some((name2 @ ("into_iter" | "iter" | "iter_mut"), recv2, [], _)) => {
+ iter_count::check(cx, expr, recv2, name2);
+ },
+ Some(("map", _, [arg], _)) => suspicious_map::check(cx, expr, recv, arg),
+ Some(("filter", recv2, [arg], _)) => bytecount::check(cx, expr, recv2, arg),
+ Some(("bytes", recv2, [], _)) => bytes_count_to_len::check(cx, expr, recv, recv2),
+ _ => {},
+ },
+ ("drain", [arg]) => {
+ iter_with_drain::check(cx, expr, recv, span, arg);
+ },
+ ("ends_with", [arg]) => {
+ if let ExprKind::MethodCall(.., span) = expr.kind {
+ case_sensitive_file_extension_comparisons::check(cx, expr, span, recv, arg);
+ }
+ },
+ ("expect", [_]) => match method_call(recv) {
+ Some(("ok", recv, [], _)) => ok_expect::check(cx, expr, recv),
+ Some(("err", recv, [], err_span)) => err_expect::check(cx, expr, recv, self.msrv, span, err_span),
+ _ => expect_used::check(cx, expr, recv, false, self.allow_expect_in_tests),
+ },
+ ("expect_err", [_]) => expect_used::check(cx, expr, recv, true, self.allow_expect_in_tests),
+ ("extend", [arg]) => {
+ string_extend_chars::check(cx, expr, recv, arg);
+ extend_with_drain::check(cx, expr, recv, arg);
+ },
+ ("filter_map", [arg]) => {
+ unnecessary_filter_map::check(cx, expr, arg, name);
+ filter_map_identity::check(cx, expr, arg, span);
+ },
+ ("find_map", [arg]) => {
+ unnecessary_filter_map::check(cx, expr, arg, name);
+ },
+ ("flat_map", [arg]) => {
+ flat_map_identity::check(cx, expr, arg, span);
+ flat_map_option::check(cx, expr, arg, span);
+ },
+ ("flatten", []) => match method_call(recv) {
+ Some(("map", recv, [map_arg], map_span)) => map_flatten::check(cx, expr, recv, map_arg, map_span),
+ Some(("cloned", recv2, [], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, true),
+ _ => {},
+ },
+ ("fold", [init, acc]) => unnecessary_fold::check(cx, expr, init, acc, span),
+ ("for_each", [_]) => {
+ if let Some(("inspect", _, [_], span2)) = method_call(recv) {
+ inspect_for_each::check(cx, expr, span2);
+ }
+ },
+ ("get", [arg]) => {
+ get_first::check(cx, expr, recv, arg);
+ get_last_with_len::check(cx, expr, recv, arg);
+ },
+ ("get_or_insert_with", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "get_or_insert"),
+ ("hash", [arg]) => {
+ unit_hash::check(cx, expr, recv, arg);
+ },
+ ("is_file", []) => filetype_is_file::check(cx, expr, recv),
+ ("is_digit", [radix]) => is_digit_ascii_radix::check(cx, expr, recv, radix, self.msrv),
+ ("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
+ ("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
+ ("iter" | "iter_mut" | "into_iter", []) => {
+ iter_on_single_or_empty_collections::check(cx, expr, name, recv);
+ },
+ ("join", [join_arg]) => {
+ if let Some(("collect", _, _, span)) = method_call(recv) {
+ unnecessary_join::check(cx, expr, recv, join_arg, span);
+ }
+ },
+ ("last", []) | ("skip", [_]) => {
+ if let Some((name2, recv2, args2, _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv, recv2, false, false);
+ }
+ }
+ },
+ ("lock", []) => {
+ mut_mutex_lock::check(cx, expr, recv, span);
+ },
+ (name @ ("map" | "map_err"), [m_arg]) => {
+ if name == "map" {
+ map_clone::check(cx, expr, recv, m_arg, self.msrv);
+ if let Some((map_name @ ("iter" | "into_iter"), recv2, _, _)) = method_call(recv) {
+ iter_kv_map::check(cx, map_name, expr, recv2, m_arg);
+ }
+ } else {
+ map_err_ignore::check(cx, expr, m_arg);
+ }
+ if let Some((name, recv2, args, span2)) = method_call(recv) {
+ match (name, args) {
+ ("as_mut", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, true, self.msrv),
+ ("as_ref", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, false, self.msrv),
+ ("filter", [f_arg]) => {
+ filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, false);
+ },
+ ("find", [f_arg]) => {
+ filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, true);
+ },
+ _ => {},
+ }
+ }
+ map_identity::check(cx, expr, recv, m_arg, name, span);
+ },
+ ("map_or", [def, map]) => {
+ option_map_or_none::check(cx, expr, recv, def, map);
+ manual_ok_or::check(cx, expr, recv, def, map);
+ },
+ ("next", []) => {
+ if let Some((name2, recv2, args2, _)) = method_call(recv) {
+ match (name2, args2) {
+ ("cloned", []) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, false),
+ ("filter", [arg]) => filter_next::check(cx, expr, recv2, arg),
+ ("filter_map", [arg]) => filter_map_next::check(cx, expr, recv2, arg, self.msrv),
+ ("iter", []) => iter_next_slice::check(cx, expr, recv2),
+ ("skip", [arg]) => iter_skip_next::check(cx, expr, recv2, arg),
+ ("skip_while", [_]) => skip_while_next::check(cx, expr),
+ _ => {},
+ }
+ }
+ },
+ ("nth", [n_arg]) => match method_call(recv) {
+ Some(("bytes", recv2, [], _)) => bytes_nth::check(cx, expr, recv2, n_arg),
+ Some(("cloned", recv2, [], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, false),
+ Some(("iter", recv2, [], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, false),
+ Some(("iter_mut", recv2, [], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, true),
+ _ => iter_nth_zero::check(cx, expr, recv, n_arg),
+ },
+ ("ok_or_else", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "ok_or"),
+ ("open", [_]) => {
+ open_options::check(cx, expr, recv);
+ },
+ ("or_else", [arg]) => {
+ if !bind_instead_of_map::ResultOrElseErrInfo::check(cx, expr, recv, arg) {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "or");
+ }
+ },
+ ("push", [arg]) => {
+ path_buf_push_overwrite::check(cx, expr, arg);
+ },
+ ("read_to_end", [_]) => {
+ verbose_file_reads::check(cx, expr, recv, verbose_file_reads::READ_TO_END_MSG);
+ },
+ ("read_to_string", [_]) => {
+ verbose_file_reads::check(cx, expr, recv, verbose_file_reads::READ_TO_STRING_MSG);
+ },
+ ("repeat", [arg]) => {
+ repeat_once::check(cx, expr, recv, arg);
+ },
+ (name @ ("replace" | "replacen"), [arg1, arg2] | [arg1, arg2, _]) => {
+ no_effect_replace::check(cx, expr, arg1, arg2);
+
+ // Check for repeated `str::replace` calls to perform `collapsible_str_replace` lint
+ if name == "replace" && let Some(("replace", ..)) = method_call(recv) {
+ collapsible_str_replace::check(cx, expr, arg1, arg2);
+ }
+ },
+ ("resize", [count_arg, default_arg]) => {
+ vec_resize_to_zero::check(cx, expr, count_arg, default_arg, span);
+ },
+ ("sort", []) => {
+ stable_sort_primitive::check(cx, expr, recv);
+ },
+ ("sort_by", [arg]) => {
+ unnecessary_sort_by::check(cx, expr, recv, arg, false);
+ },
+ ("sort_unstable_by", [arg]) => {
+ unnecessary_sort_by::check(cx, expr, recv, arg, true);
+ },
+ ("splitn" | "rsplitn", [count_arg, pat_arg]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ str_splitn::check(cx, name, expr, recv, pat_arg, count, self.msrv);
+ }
+ },
+ ("splitn_mut" | "rsplitn_mut", [count_arg, _]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ }
+ },
+ ("step_by", [arg]) => iterator_step_by_zero::check(cx, expr, arg),
+ ("take", [_arg]) => {
+ if let Some((name2, recv2, args2, _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv, recv2, false, false);
+ }
+ }
+ },
+ ("take", []) => needless_option_take::check(cx, expr, recv),
+ ("then", [arg]) => {
+ if !meets_msrv(self.msrv, msrvs::BOOL_THEN_SOME) {
+ return;
+ }
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "then_some");
+ },
+ ("to_owned", []) => {
+ if !suspicious_to_owned::check(cx, expr, recv) {
+ implicit_clone::check(cx, name, expr, recv);
+ }
+ },
+ ("to_os_string" | "to_path_buf" | "to_vec", []) => {
+ implicit_clone::check(cx, name, expr, recv);
+ },
+ ("unwrap", []) => {
+ match method_call(recv) {
+ Some(("get", recv, [get_arg], _)) => {
+ get_unwrap::check(cx, expr, recv, get_arg, false);
+ },
+ Some(("get_mut", recv, [get_arg], _)) => {
+ get_unwrap::check(cx, expr, recv, get_arg, true);
+ },
+ Some(("or", recv, [or_arg], or_span)) => {
+ or_then_unwrap::check(cx, expr, recv, or_arg, or_span);
+ },
+ _ => {},
+ }
+ unwrap_used::check(cx, expr, recv, false, self.allow_unwrap_in_tests);
+ },
+ ("unwrap_err", []) => unwrap_used::check(cx, expr, recv, true, self.allow_unwrap_in_tests),
+ ("unwrap_or", [u_arg]) => match method_call(recv) {
+ Some((arith @ ("checked_add" | "checked_sub" | "checked_mul"), lhs, [rhs], _)) => {
+ manual_saturating_arithmetic::check(cx, expr, lhs, rhs, u_arg, &arith["checked_".len()..]);
+ },
+ Some(("map", m_recv, [m_arg], span)) => {
+ option_map_unwrap_or::check(cx, expr, m_recv, m_arg, recv, u_arg, span);
+ },
+ Some(("then_some", t_recv, [t_arg], _)) => {
+ obfuscated_if_else::check(cx, expr, t_recv, t_arg, u_arg);
+ },
+ _ => {},
+ },
+ ("unwrap_or_else", [u_arg]) => match method_call(recv) {
+ Some(("map", recv, [map_arg], _))
+ if map_unwrap_or::check(cx, expr, recv, map_arg, u_arg, self.msrv) => {},
+ _ => {
+ unwrap_or_else_default::check(cx, expr, recv, u_arg);
+ unnecessary_lazy_eval::check(cx, expr, recv, u_arg, "unwrap_or");
+ },
+ },
+ ("zip", [arg]) => {
+ if let ExprKind::MethodCall(name, iter_recv, [], _) = recv.kind
+ && name.ident.name == sym::iter
+ {
+ range_zip_with_len::check(cx, expr, iter_recv, arg);
+ }
+ },
+ _ => {},
+ }
+ }
+ }
+}
+
+fn check_is_some_is_none(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, is_some: bool) {
+ if let Some((name @ ("find" | "position" | "rposition"), f_recv, [arg], span)) = method_call(recv) {
+ search_is_some::check(cx, expr, name, is_some, f_recv, arg, recv, span);
+ }
+}
+
+/// Used for `lint_binary_expr_with_method_call`.
+#[derive(Copy, Clone)]
+struct BinaryExprInfo<'a> {
+ expr: &'a hir::Expr<'a>,
+ chain: &'a hir::Expr<'a>,
+ other: &'a hir::Expr<'a>,
+ eq: bool,
+}
+
+/// Checks for the `CHARS_NEXT_CMP` and `CHARS_LAST_CMP` lints.
+fn lint_binary_expr_with_method_call(cx: &LateContext<'_>, info: &mut BinaryExprInfo<'_>) {
+ macro_rules! lint_with_both_lhs_and_rhs {
+ ($func:expr, $cx:expr, $info:ident) => {
+ if !$func($cx, $info) {
+ ::std::mem::swap(&mut $info.chain, &mut $info.other);
+ if $func($cx, $info) {
+ return;
+ }
+ }
+ };
+ }
+
+ lint_with_both_lhs_and_rhs!(chars_next_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_next_cmp_with_unwrap::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp_with_unwrap::check, cx, info);
+}
+
+const FN_HEADER: hir::FnHeader = hir::FnHeader {
+ unsafety: hir::Unsafety::Normal,
+ constness: hir::Constness::NotConst,
+ asyncness: hir::IsAsync::NotAsync,
+ abi: rustc_target::spec::abi::Abi::Rust,
+};
+
+struct ShouldImplTraitCase {
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ // implicit self kind expected (none, self, &self, ...)
+ self_kind: SelfKind,
+ // checks against the output type
+ output_type: OutType,
+ // certain methods with explicit lifetimes can't implement the equivalent trait method
+ lint_explicit_lifetime: bool,
+}
+impl ShouldImplTraitCase {
+ const fn new(
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ self_kind: SelfKind,
+ output_type: OutType,
+ lint_explicit_lifetime: bool,
+ ) -> ShouldImplTraitCase {
+ ShouldImplTraitCase {
+ trait_name,
+ method_name,
+ param_count,
+ fn_header,
+ self_kind,
+ output_type,
+ lint_explicit_lifetime,
+ }
+ }
+
+ fn lifetime_param_cond(&self, impl_item: &hir::ImplItem<'_>) -> bool {
+ self.lint_explicit_lifetime
+ || !impl_item.generics.params.iter().any(|p| {
+ matches!(
+ p.kind,
+ hir::GenericParamKind::Lifetime {
+ kind: hir::LifetimeParamKind::Explicit
+ }
+ )
+ })
+ }
+}
+
+#[rustfmt::skip]
+const TRAIT_METHODS: [ShouldImplTraitCase; 30] = [
+ ShouldImplTraitCase::new("std::ops::Add", "add", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::convert::AsMut", "as_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::convert::AsRef", "as_ref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::BitAnd", "bitand", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitOr", "bitor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitXor", "bitxor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::borrow::Borrow", "borrow", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::borrow::BorrowMut", "borrow_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::clone::Clone", "clone", 1, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ ShouldImplTraitCase::new("std::cmp::Ord", "cmp", 2, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ ShouldImplTraitCase::new("std::default::Default", "default", 0, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Deref", "deref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::DerefMut", "deref_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::Div", "div", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Drop", "drop", 1, FN_HEADER, SelfKind::RefMut, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::cmp::PartialEq", "eq", 2, FN_HEADER, SelfKind::Ref, OutType::Bool, true),
+ ShouldImplTraitCase::new("std::iter::FromIterator", "from_iter", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::str::FromStr", "from_str", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::hash::Hash", "hash", 2, FN_HEADER, SelfKind::Ref, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::ops::Index", "index", 2, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::IndexMut", "index_mut", 2, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::iter::IntoIterator", "into_iter", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Mul", "mul", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Neg", "neg", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::iter::Iterator", "next", 1, FN_HEADER, SelfKind::RefMut, OutType::Any, false),
+ ShouldImplTraitCase::new("std::ops::Not", "not", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Rem", "rem", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shl", "shl", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shr", "shr", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Sub", "sub", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+];
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+enum SelfKind {
+ Value,
+ Ref,
+ RefMut,
+ No, // When we want the first argument type to be different than `Self`
+}
+
+impl SelfKind {
+ fn matches<'a>(self, cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ if ty == parent_ty {
+ true
+ } else if ty.is_box() {
+ ty.boxed_ty() == parent_ty
+ } else if is_type_diagnostic_item(cx, ty, sym::Rc) || is_type_diagnostic_item(cx, ty, sym::Arc) {
+ if let ty::Adt(_, substs) = ty.kind() {
+ substs.types().next().map_or(false, |t| t == parent_ty)
+ } else {
+ false
+ }
+ } else {
+ false
+ }
+ }
+
+ fn matches_ref<'a>(cx: &LateContext<'a>, mutability: hir::Mutability, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ if let ty::Ref(_, t, m) = *ty.kind() {
+ return m == mutability && t == parent_ty;
+ }
+
- let trait_def_id = match get_trait_def_id(cx, trait_path) {
- Some(did) => did,
- None => return false,
++ let trait_sym = match mutability {
++ hir::Mutability::Not => sym::AsRef,
++ hir::Mutability::Mut => sym::AsMut,
+ };
+
++ let Some(trait_def_id) = cx.tcx.get_diagnostic_item(trait_sym) else {
++ return false
+ };
+ implements_trait(cx, ty, trait_def_id, &[parent_ty.into()])
+ }
+
+ fn matches_none<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ !matches_value(cx, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Not, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Mut, parent_ty, ty)
+ }
+
+ match self {
+ Self::Value => matches_value(cx, parent_ty, ty),
+ Self::Ref => matches_ref(cx, hir::Mutability::Not, parent_ty, ty) || ty == parent_ty && is_copy(cx, ty),
+ Self::RefMut => matches_ref(cx, hir::Mutability::Mut, parent_ty, ty),
+ Self::No => matches_none(cx, parent_ty, ty),
+ }
+ }
+
+ #[must_use]
+ fn description(self) -> &'static str {
+ match self {
+ Self::Value => "`self` by value",
+ Self::Ref => "`self` by reference",
+ Self::RefMut => "`self` by mutable reference",
+ Self::No => "no `self`",
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+enum OutType {
+ Unit,
+ Bool,
+ Any,
+ Ref,
+}
+
+impl OutType {
+ fn matches(self, ty: &hir::FnRetTy<'_>) -> bool {
+ let is_unit = |ty: &hir::Ty<'_>| matches!(ty.kind, hir::TyKind::Tup(&[]));
+ match (self, ty) {
+ (Self::Unit, &hir::FnRetTy::DefaultReturn(_)) => true,
+ (Self::Unit, &hir::FnRetTy::Return(ty)) if is_unit(ty) => true,
+ (Self::Bool, &hir::FnRetTy::Return(ty)) if is_bool(ty) => true,
+ (Self::Any, &hir::FnRetTy::Return(ty)) if !is_unit(ty) => true,
+ (Self::Ref, &hir::FnRetTy::Return(ty)) => matches!(ty.kind, hir::TyKind::Rptr(_, _)),
+ _ => false,
+ }
+ }
+}
+
+fn is_bool(ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ matches!(path.res, Res::PrimTy(PrimTy::Bool))
+ } else {
+ false
+ }
+}
+
+fn fn_header_equals(expected: hir::FnHeader, actual: hir::FnHeader) -> bool {
+ expected.constness == actual.constness
+ && expected.unsafety == actual.unsafety
+ && expected.asyncness == actual.asyncness
+}
--- /dev/null
- let deref_aliases: [&[&str]; 9] = [
- &paths::DEREF_TRAIT_METHOD,
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{match_def_path, meets_msrv, msrvs, path_to_local_id, paths, peel_blocks};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+use rustc_semver::RustcVersion;
+use rustc_span::sym;
+
+use super::OPTION_AS_REF_DEREF;
+
+/// lint use of `_.as_ref().map(Deref::deref)` for `Option`s
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'_>,
+ as_ref_recv: &hir::Expr<'_>,
+ map_arg: &hir::Expr<'_>,
+ is_mut: bool,
+ msrv: Option<RustcVersion>,
+) {
+ if !meets_msrv(msrv, msrvs::OPTION_AS_DEREF) {
+ return;
+ }
+
+ let same_mutability = |m| (is_mut && m == &hir::Mutability::Mut) || (!is_mut && m == &hir::Mutability::Not);
+
+ let option_ty = cx.typeck_results().expr_ty(as_ref_recv);
+ if !is_type_diagnostic_item(cx, option_ty, sym::Option) {
+ return;
+ }
+
- hir::ExprKind::Path(ref expr_qpath) => cx
- .qpath_res(expr_qpath, map_arg.hir_id)
- .opt_def_id()
- .map_or(false, |fun_def_id| {
- deref_aliases.iter().any(|path| match_def_path(cx, fun_def_id, path))
- }),
++ let deref_aliases: [&[&str]; 8] = [
+ &paths::DEREF_MUT_TRAIT_METHOD,
+ &paths::CSTRING_AS_C_STR,
+ &paths::OS_STRING_AS_OS_STR,
+ &paths::PATH_BUF_AS_PATH,
+ &paths::STRING_AS_STR,
+ &paths::STRING_AS_MUT_STR,
+ &paths::VEC_AS_SLICE,
+ &paths::VEC_AS_MUT_SLICE,
+ ];
+
+ let is_deref = match map_arg.kind {
- deref_aliases.iter().any(|path| match_def_path(cx, method_did, path))
++ hir::ExprKind::Path(ref expr_qpath) => {
++ cx.qpath_res(expr_qpath, map_arg.hir_id)
++ .opt_def_id()
++ .map_or(false, |fun_def_id| {
++ cx.tcx.is_diagnostic_item(sym::deref_method, fun_def_id)
++ || deref_aliases.iter().any(|path| match_def_path(cx, fun_def_id, path))
++ })
++ },
+ hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
+ let closure_body = cx.tcx.hir().body(body);
+ let closure_expr = peel_blocks(closure_body.value);
+
+ match &closure_expr.kind {
+ hir::ExprKind::MethodCall(_, receiver, [], _) => {
+ if_chain! {
+ if path_to_local_id(receiver, closure_body.params[0].pat.hir_id);
+ let adj = cx
+ .typeck_results()
+ .expr_adjustments(receiver)
+ .iter()
+ .map(|x| &x.kind)
+ .collect::<Box<[_]>>();
+ if let [ty::adjustment::Adjust::Deref(None), ty::adjustment::Adjust::Borrow(_)] = *adj;
+ then {
+ let method_did = cx.typeck_results().type_dependent_def_id(closure_expr.hir_id).unwrap();
++ cx.tcx.is_diagnostic_item(sym::deref_method, method_did)
++ || deref_aliases.iter().any(|path| match_def_path(cx, method_did, path))
+ } else {
+ false
+ }
+ }
+ },
+ hir::ExprKind::AddrOf(hir::BorrowKind::Ref, m, inner) if same_mutability(m) => {
+ if_chain! {
+ if let hir::ExprKind::Unary(hir::UnOp::Deref, inner1) = inner.kind;
+ if let hir::ExprKind::Unary(hir::UnOp::Deref, inner2) = inner1.kind;
+ then {
+ path_to_local_id(inner2, closure_body.params[0].pat.hir_id)
+ } else {
+ false
+ }
+ }
+ },
+ _ => false,
+ }
+ },
+ _ => false,
+ };
+
+ if is_deref {
+ let current_method = if is_mut {
+ format!(".as_mut().map({})", snippet(cx, map_arg.span, ".."))
+ } else {
+ format!(".as_ref().map({})", snippet(cx, map_arg.span, ".."))
+ };
+ let method_hint = if is_mut { "as_deref_mut" } else { "as_deref" };
+ let hint = format!("{}.{method_hint}()", snippet(cx, as_ref_recv.span, ".."));
+ let suggestion = format!("try using {method_hint} instead");
+
+ let msg = format!(
+ "called `{current_method}` on an Option value. This can be done more directly \
+ by calling `{hint}` instead"
+ );
+ span_lint_and_sugg(
+ cx,
+ OPTION_AS_REF_DEREF,
+ expr.span,
+ &msg,
+ &suggestion,
+ hint,
+ Applicability::MachineApplicable,
+ );
+ }
+}
--- /dev/null
- use clippy_utils::ty::{implements_trait, match_type};
- use clippy_utils::{contains_return, is_trait_item, last_path_segment, paths};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::eager_or_lazy::switch_to_lazy_eval;
+use clippy_utils::source::{snippet, snippet_with_macro_callsite};
- use rustc_span::symbol::{kw, sym};
++use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
++use clippy_utils::{contains_return, is_trait_item, last_path_segment};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_span::source_map::Span;
- const KNOW_TYPES: [(&[&str], bool, &[&str], &str); 4] = [
- (&paths::BTREEMAP_ENTRY, false, &["or_insert"], "with"),
- (&paths::HASHMAP_ENTRY, false, &["or_insert"], "with"),
- (&paths::OPTION, false, &["map_or", "ok_or", "or", "unwrap_or"], "else"),
- (&paths::RESULT, true, &["or", "unwrap_or"], "else"),
++use rustc_span::symbol::{kw, sym, Symbol};
+use std::borrow::Cow;
+
+use super::OR_FUN_CALL;
+
+/// Checks for the `OR_FUN_CALL` lint.
+#[allow(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'_>,
+ method_span: Span,
+ name: &str,
+ receiver: &'tcx hir::Expr<'_>,
+ args: &'tcx [hir::Expr<'_>],
+) {
+ /// Checks for `unwrap_or(T::new())`, `unwrap_or(T::default())`,
+ /// `or_insert(T::new())` or `or_insert(T::default())`.
+ #[allow(clippy::too_many_arguments)]
+ fn check_unwrap_or_default(
+ cx: &LateContext<'_>,
+ name: &str,
+ fun: &hir::Expr<'_>,
+ arg: &hir::Expr<'_>,
+ or_has_args: bool,
+ span: Span,
+ method_span: Span,
+ ) -> bool {
+ let is_default_default = || is_trait_item(cx, fun, sym::Default);
+
+ let implements_default = |arg, default_trait_id| {
+ let arg_ty = cx.typeck_results().expr_ty(arg);
+ implements_trait(cx, arg_ty, default_trait_id, &[])
+ };
+
+ if_chain! {
+ if !or_has_args;
+ if let Some(sugg) = match name {
+ "unwrap_or" => Some("unwrap_or_default"),
+ "or_insert" => Some("or_default"),
+ _ => None,
+ };
+ if let hir::ExprKind::Path(ref qpath) = fun.kind;
+ if let Some(default_trait_id) = cx.tcx.get_diagnostic_item(sym::Default);
+ let path = last_path_segment(qpath).ident.name;
+ // needs to target Default::default in particular or be *::new and have a Default impl
+ // available
+ if (matches!(path, kw::Default) && is_default_default())
+ || (matches!(path, sym::new) && implements_default(arg, default_trait_id));
+
+ then {
+ span_lint_and_sugg(
+ cx,
+ OR_FUN_CALL,
+ method_span.with_hi(span.hi()),
+ &format!("use of `{name}` followed by a call to `{path}`"),
+ "try this",
+ format!("{sugg}()"),
+ Applicability::MachineApplicable,
+ );
+
+ true
+ } else {
+ false
+ }
+ }
+ }
+
+ /// Checks for `*or(foo())`.
+ #[allow(clippy::too_many_arguments)]
+ fn check_general_case<'tcx>(
+ cx: &LateContext<'tcx>,
+ name: &str,
+ method_span: Span,
+ self_expr: &hir::Expr<'_>,
+ arg: &'tcx hir::Expr<'_>,
+ span: Span,
+ // None if lambda is required
+ fun_span: Option<Span>,
+ ) {
+ // (path, fn_has_argument, methods, suffix)
- KNOW_TYPES.iter().find(|&&i| match_type(cx, self_ty, i.0));
++ const KNOW_TYPES: [(Symbol, bool, &[&str], &str); 4] = [
++ (sym::BTreeEntry, false, &["or_insert"], "with"),
++ (sym::HashMapEntry, false, &["or_insert"], "with"),
++ (sym::Option, false, &["map_or", "ok_or", "or", "unwrap_or"], "else"),
++ (sym::Result, true, &["or", "unwrap_or"], "else"),
+ ];
+
+ if_chain! {
+ if KNOW_TYPES.iter().any(|k| k.2.contains(&name));
+
+ if switch_to_lazy_eval(cx, arg);
+ if !contains_return(arg);
+
+ let self_ty = cx.typeck_results().expr_ty(self_expr);
+
+ if let Some(&(_, fn_has_arguments, poss, suffix)) =
- None => macro_expanded_snipped
++ KNOW_TYPES.iter().find(|&&i| is_type_diagnostic_item(cx, self_ty, i.0));
+
+ if poss.contains(&name);
+
+ then {
+ let macro_expanded_snipped;
+ let sugg: Cow<'_, str> = {
+ let (snippet_span, use_lambda) = match (fn_has_arguments, fun_span) {
+ (false, Some(fun_span)) => (fun_span, false),
+ _ => (arg.span, true),
+ };
+ let snippet = {
+ let not_macro_argument_snippet = snippet_with_macro_callsite(cx, snippet_span, "..");
+ if not_macro_argument_snippet == "vec![]" {
+ macro_expanded_snipped = snippet(cx, snippet_span, "..");
+ match macro_expanded_snipped.strip_prefix("$crate::vec::") {
+ Some(stripped) => Cow::from(stripped),
- }
- else {
++ None => macro_expanded_snipped,
+ }
++ } else {
+ not_macro_argument_snippet
+ }
+ };
+
+ if use_lambda {
+ let l_arg = if fn_has_arguments { "_" } else { "" };
+ format!("|{l_arg}| {snippet}").into()
+ } else {
+ snippet
+ }
+ };
+ let span_replace_word = method_span.with_hi(span.hi());
+ span_lint_and_sugg(
+ cx,
+ OR_FUN_CALL,
+ span_replace_word,
+ &format!("use of `{name}` followed by a function call"),
+ "try this",
+ format!("{name}_{suffix}({sugg})"),
+ Applicability::HasPlaceholders,
+ );
+ }
+ }
+ }
+
+ if let [arg] = args {
+ let inner_arg = if let hir::ExprKind::Block(
+ hir::Block {
+ stmts: [],
+ expr: Some(expr),
+ ..
+ },
+ _,
+ ) = arg.kind
+ {
+ expr
+ } else {
+ arg
+ };
+ match inner_arg.kind {
+ hir::ExprKind::Call(fun, or_args) => {
+ let or_has_args = !or_args.is_empty();
+ if !check_unwrap_or_default(cx, name, fun, arg, or_has_args, expr.span, method_span) {
+ let fun_span = if or_has_args { None } else { Some(fun.span) };
+ check_general_case(cx, name, method_span, receiver, arg, expr.span, fun_span);
+ }
+ },
+ hir::ExprKind::Index(..) | hir::ExprKind::MethodCall(..) => {
+ check_general_case(cx, name, method_span, receiver, arg, expr.span, None);
+ },
+ _ => (),
+ }
+ }
+}
--- /dev/null
- let (name, args) = if let ExprKind::MethodCall(name, _, [args @ ..], _) = e.kind {
- (name, args)
- } else {
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::snippet_with_context;
+use clippy_utils::usage::local_used_after_expr;
+use clippy_utils::visitors::{for_each_expr_with_closures, Descend};
+use clippy_utils::{is_diag_item_method, match_def_path, meets_msrv, msrvs, path_to_local_id, paths};
+use core::ops::ControlFlow;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{
+ BindingAnnotation, Expr, ExprKind, HirId, LangItem, Local, MatchSource, Node, Pat, PatKind, QPath, Stmt, StmtKind,
+};
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+use rustc_semver::RustcVersion;
+use rustc_span::{sym, Span, Symbol, SyntaxContext};
+
+use super::{MANUAL_SPLIT_ONCE, NEEDLESS_SPLITN};
+
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ method_name: &str,
+ expr: &Expr<'_>,
+ self_arg: &Expr<'_>,
+ pat_arg: &Expr<'_>,
+ count: u128,
+ msrv: Option<RustcVersion>,
+) {
+ if count < 2 || !cx.typeck_results().expr_ty_adjusted(self_arg).peel_refs().is_str() {
+ return;
+ }
+
+ let needless = |usage_kind| match usage_kind {
+ IterUsageKind::Nth(n) => count > n + 1,
+ IterUsageKind::NextTuple => count > 2,
+ };
+ let manual = count == 2 && meets_msrv(msrv, msrvs::STR_SPLIT_ONCE);
+
+ match parse_iter_usage(cx, expr.span.ctxt(), cx.tcx.hir().parent_iter(expr.hir_id)) {
+ Some(usage) if needless(usage.kind) => lint_needless(cx, method_name, expr, self_arg, pat_arg),
+ Some(usage) if manual => check_manual_split_once(cx, method_name, expr, self_arg, pat_arg, &usage),
+ None if manual => {
+ check_manual_split_once_indirect(cx, method_name, expr, self_arg, pat_arg);
+ },
+ _ => {},
+ }
+}
+
+fn lint_needless(cx: &LateContext<'_>, method_name: &str, expr: &Expr<'_>, self_arg: &Expr<'_>, pat_arg: &Expr<'_>) {
+ let mut app = Applicability::MachineApplicable;
+ let r = if method_name == "splitn" { "" } else { "r" };
+
+ span_lint_and_sugg(
+ cx,
+ NEEDLESS_SPLITN,
+ expr.span,
+ &format!("unnecessary use of `{r}splitn`"),
+ "try this",
+ format!(
+ "{}.{r}split({})",
+ snippet_with_context(cx, self_arg.span, expr.span.ctxt(), "..", &mut app).0,
+ snippet_with_context(cx, pat_arg.span, expr.span.ctxt(), "..", &mut app).0,
+ ),
+ app,
+ );
+}
+
+fn check_manual_split_once(
+ cx: &LateContext<'_>,
+ method_name: &str,
+ expr: &Expr<'_>,
+ self_arg: &Expr<'_>,
+ pat_arg: &Expr<'_>,
+ usage: &IterUsage,
+) {
+ let ctxt = expr.span.ctxt();
+ let (msg, reverse) = if method_name == "splitn" {
+ ("manual implementation of `split_once`", false)
+ } else {
+ ("manual implementation of `rsplit_once`", true)
+ };
+
+ let mut app = Applicability::MachineApplicable;
+ let self_snip = snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0;
+ let pat_snip = snippet_with_context(cx, pat_arg.span, ctxt, "..", &mut app).0;
+
+ let sugg = match usage.kind {
+ IterUsageKind::NextTuple => {
+ if reverse {
+ format!("{self_snip}.rsplit_once({pat_snip}).map(|(x, y)| (y, x))")
+ } else {
+ format!("{self_snip}.split_once({pat_snip})")
+ }
+ },
+ IterUsageKind::Nth(1) => {
+ let (r, field) = if reverse { ("r", 0) } else { ("", 1) };
+
+ match usage.unwrap_kind {
+ Some(UnwrapKind::Unwrap) => {
+ format!("{self_snip}.{r}split_once({pat_snip}).unwrap().{field}")
+ },
+ Some(UnwrapKind::QuestionMark) => {
+ format!("{self_snip}.{r}split_once({pat_snip})?.{field}")
+ },
+ None => {
+ format!("{self_snip}.{r}split_once({pat_snip}).map(|x| x.{field})")
+ },
+ }
+ },
+ IterUsageKind::Nth(_) => return,
+ };
+
+ span_lint_and_sugg(cx, MANUAL_SPLIT_ONCE, usage.span, msg, "try this", sugg, app);
+}
+
+/// checks for
+///
+/// ```
+/// let mut iter = "a.b.c".splitn(2, '.');
+/// let a = iter.next();
+/// let b = iter.next();
+/// ```
+fn check_manual_split_once_indirect(
+ cx: &LateContext<'_>,
+ method_name: &str,
+ expr: &Expr<'_>,
+ self_arg: &Expr<'_>,
+ pat_arg: &Expr<'_>,
+) -> Option<()> {
+ let ctxt = expr.span.ctxt();
+ let mut parents = cx.tcx.hir().parent_iter(expr.hir_id);
+ if let (_, Node::Local(local)) = parents.next()?
+ && let PatKind::Binding(BindingAnnotation::MUT, iter_binding_id, iter_ident, None) = local.pat.kind
+ && let (iter_stmt_id, Node::Stmt(_)) = parents.next()?
+ && let (_, Node::Block(enclosing_block)) = parents.next()?
+
+ && let mut stmts = enclosing_block
+ .stmts
+ .iter()
+ .skip_while(|stmt| stmt.hir_id != iter_stmt_id)
+ .skip(1)
+
+ && let first = indirect_usage(cx, stmts.next()?, iter_binding_id, ctxt)?
+ && let second = indirect_usage(cx, stmts.next()?, iter_binding_id, ctxt)?
+ && first.unwrap_kind == second.unwrap_kind
+ && first.name != second.name
+ && !local_used_after_expr(cx, iter_binding_id, second.init_expr)
+ {
+ let (r, lhs, rhs) = if method_name == "splitn" {
+ ("", first.name, second.name)
+ } else {
+ ("r", second.name, first.name)
+ };
+ let msg = format!("manual implementation of `{r}split_once`");
+
+ let mut app = Applicability::MachineApplicable;
+ let self_snip = snippet_with_context(cx, self_arg.span, ctxt, "..", &mut app).0;
+ let pat_snip = snippet_with_context(cx, pat_arg.span, ctxt, "..", &mut app).0;
+
+ span_lint_and_then(cx, MANUAL_SPLIT_ONCE, local.span, &msg, |diag| {
+ diag.span_label(first.span, "first usage here");
+ diag.span_label(second.span, "second usage here");
+
+ let unwrap = match first.unwrap_kind {
+ UnwrapKind::Unwrap => ".unwrap()",
+ UnwrapKind::QuestionMark => "?",
+ };
+ diag.span_suggestion_verbose(
+ local.span,
+ &format!("try `{r}split_once`"),
+ format!("let ({lhs}, {rhs}) = {self_snip}.{r}split_once({pat_snip}){unwrap};"),
+ app,
+ );
+
+ let remove_msg = format!("remove the `{iter_ident}` usages");
+ diag.span_suggestion(
+ first.span,
+ &remove_msg,
+ "",
+ app,
+ );
+ diag.span_suggestion(
+ second.span,
+ &remove_msg,
+ "",
+ app,
+ );
+ });
+ }
+
+ Some(())
+}
+
+#[derive(Debug)]
+struct IndirectUsage<'a> {
+ name: Symbol,
+ span: Span,
+ init_expr: &'a Expr<'a>,
+ unwrap_kind: UnwrapKind,
+}
+
+/// returns `Some(IndirectUsage)` for e.g.
+///
+/// ```ignore
+/// let name = binding.next()?;
+/// let name = binding.next().unwrap();
+/// ```
+fn indirect_usage<'tcx>(
+ cx: &LateContext<'tcx>,
+ stmt: &Stmt<'tcx>,
+ binding: HirId,
+ ctxt: SyntaxContext,
+) -> Option<IndirectUsage<'tcx>> {
+ if let StmtKind::Local(&Local {
+ pat: Pat {
+ kind: PatKind::Binding(BindingAnnotation::NONE, _, ident, None),
+ ..
+ },
+ init: Some(init_expr),
+ hir_id: local_hir_id,
+ ..
+ }) = stmt.kind
+ {
+ let mut path_to_binding = None;
+ let _: Option<!> = for_each_expr_with_closures(cx, init_expr, |e| {
+ if path_to_local_id(e, binding) {
+ path_to_binding = Some(e);
+ }
+ ControlFlow::Continue(Descend::from(path_to_binding.is_none()))
+ });
+
+ let mut parents = cx.tcx.hir().parent_iter(path_to_binding?.hir_id);
+ let iter_usage = parse_iter_usage(cx, ctxt, &mut parents)?;
+
+ let (parent_id, _) = parents.find(|(_, node)| {
+ !matches!(
+ node,
+ Node::Expr(Expr {
+ kind: ExprKind::Match(.., MatchSource::TryDesugar),
+ ..
+ })
+ )
+ })?;
+
+ if let IterUsage {
+ kind: IterUsageKind::Nth(0),
+ unwrap_kind: Some(unwrap_kind),
+ ..
+ } = iter_usage
+ {
+ if parent_id == local_hir_id {
+ return Some(IndirectUsage {
+ name: ident.name,
+ span: stmt.span,
+ init_expr,
+ unwrap_kind,
+ });
+ }
+ }
+ }
+
+ None
+}
+
+#[derive(Debug, Clone, Copy)]
+enum IterUsageKind {
+ Nth(u128),
+ NextTuple,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+enum UnwrapKind {
+ Unwrap,
+ QuestionMark,
+}
+
+#[derive(Debug)]
+struct IterUsage {
+ kind: IterUsageKind,
+ unwrap_kind: Option<UnwrapKind>,
+ span: Span,
+}
+
+#[allow(clippy::too_many_lines)]
+fn parse_iter_usage<'tcx>(
+ cx: &LateContext<'tcx>,
+ ctxt: SyntaxContext,
+ mut iter: impl Iterator<Item = (HirId, Node<'tcx>)>,
+) -> Option<IterUsage> {
+ let (kind, span) = match iter.next() {
+ Some((_, Node::Expr(e))) if e.span.ctxt() == ctxt => {
++ let ExprKind::MethodCall(name, _, [args @ ..], _) = e.kind else {
+ return None;
+ };
+ let did = cx.typeck_results().type_dependent_def_id(e.hir_id)?;
+ let iter_id = cx.tcx.get_diagnostic_item(sym::Iterator)?;
+
+ match (name.ident.as_str(), args) {
+ ("next", []) if cx.tcx.trait_of_item(did) == Some(iter_id) => (IterUsageKind::Nth(0), e.span),
+ ("next_tuple", []) => {
+ return if_chain! {
+ if match_def_path(cx, did, &paths::ITERTOOLS_NEXT_TUPLE);
+ if let ty::Adt(adt_def, subs) = cx.typeck_results().expr_ty(e).kind();
+ if cx.tcx.is_diagnostic_item(sym::Option, adt_def.did());
+ if let ty::Tuple(subs) = subs.type_at(0).kind();
+ if subs.len() == 2;
+ then {
+ Some(IterUsage {
+ kind: IterUsageKind::NextTuple,
+ span: e.span,
+ unwrap_kind: None
+ })
+ } else {
+ None
+ }
+ };
+ },
+ ("nth" | "skip", [idx_expr]) if cx.tcx.trait_of_item(did) == Some(iter_id) => {
+ if let Some((Constant::Int(idx), _)) = constant(cx, cx.typeck_results(), idx_expr) {
+ let span = if name.ident.as_str() == "nth" {
+ e.span
+ } else {
+ if_chain! {
+ if let Some((_, Node::Expr(next_expr))) = iter.next();
+ if let ExprKind::MethodCall(next_name, _, [], _) = next_expr.kind;
+ if next_name.ident.name == sym::next;
+ if next_expr.span.ctxt() == ctxt;
+ if let Some(next_id) = cx.typeck_results().type_dependent_def_id(next_expr.hir_id);
+ if cx.tcx.trait_of_item(next_id) == Some(iter_id);
+ then {
+ next_expr.span
+ } else {
+ return None;
+ }
+ }
+ };
+ (IterUsageKind::Nth(idx), span)
+ } else {
+ return None;
+ }
+ },
+ _ => return None,
+ }
+ },
+ _ => return None,
+ };
+
+ let (unwrap_kind, span) = if let Some((_, Node::Expr(e))) = iter.next() {
+ match e.kind {
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(QPath::LangItem(LangItem::TryTraitBranch, ..)),
+ ..
+ },
+ _,
+ ) => {
+ let parent_span = e.span.parent_callsite().unwrap();
+ if parent_span.ctxt() == ctxt {
+ (Some(UnwrapKind::QuestionMark), parent_span)
+ } else {
+ (None, span)
+ }
+ },
+ _ if e.span.ctxt() != ctxt => (None, span),
+ ExprKind::MethodCall(name, _, [], _)
+ if name.ident.name == sym::unwrap
+ && cx
+ .typeck_results()
+ .type_dependent_def_id(e.hir_id)
+ .map_or(false, |id| is_diag_item_method(cx, id, sym::Option)) =>
+ {
+ (Some(UnwrapKind::Unwrap), e.span)
+ },
+ _ => (None, span),
+ }
+ } else {
+ (None, span)
+ };
+
+ Some(IterUsage {
+ kind,
+ unwrap_kind,
+ span,
+ })
+}
--- /dev/null
- let fn_ctxt = FnCtxt::new(&inherited, cx.param_env, item.hir_id());
+use super::implicit_clone::is_clone_like;
+use super::unnecessary_iter_cloned::{self, is_into_iter};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{get_associated_type, get_iterator_item_ty, implements_trait, is_copy, peel_mid_ty_refs};
+use clippy_utils::visitors::find_all_ret_expressions;
+use clippy_utils::{fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, return_ty};
+use clippy_utils::{meets_msrv, msrvs};
+use rustc_errors::Applicability;
+use rustc_hir::{def_id::DefId, BorrowKind, Expr, ExprKind, ItemKind, LangItem, Node};
+use rustc_hir_typeck::{FnCtxt, Inherited};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::LateContext;
+use rustc_middle::mir::Mutability;
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, OverloadedDeref};
+use rustc_middle::ty::subst::{GenericArg, GenericArgKind, SubstsRef};
+use rustc_middle::ty::EarlyBinder;
+use rustc_middle::ty::{self, ParamTy, PredicateKind, ProjectionPredicate, TraitPredicate, Ty};
+use rustc_semver::RustcVersion;
+use rustc_span::{sym, Symbol};
+use rustc_trait_selection::traits::{query::evaluate_obligation::InferCtxtExt as _, Obligation, ObligationCause};
+use std::cmp::max;
+
+use super::UNNECESSARY_TO_OWNED;
+
+pub fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'tcx>,
+ method_name: Symbol,
+ receiver: &'tcx Expr<'_>,
+ args: &'tcx [Expr<'_>],
+ msrv: Option<RustcVersion>,
+) {
+ if_chain! {
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if args.is_empty();
+ then {
+ if is_cloned_or_copied(cx, method_name, method_def_id) {
+ unnecessary_iter_cloned::check(cx, expr, method_name, receiver);
+ } else if is_to_owned_like(cx, expr, method_name, method_def_id) {
+ // At this point, we know the call is of a `to_owned`-like function. The functions
+ // `check_addr_of_expr` and `check_call_arg` determine whether the call is unnecessary
+ // based on its context, that is, whether it is a referent in an `AddrOf` expression, an
+ // argument in a `into_iter` call, or an argument in the call of some other function.
+ if check_addr_of_expr(cx, expr, method_name, method_def_id, receiver) {
+ return;
+ }
+ if check_into_iter_call_arg(cx, expr, method_name, receiver, msrv) {
+ return;
+ }
+ check_other_call_arg(cx, expr, method_name, receiver);
+ }
+ }
+ }
+}
+
+/// Checks whether `expr` is a referent in an `AddrOf` expression and, if so, determines whether its
+/// call of a `to_owned`-like function is unnecessary.
+#[allow(clippy::too_many_lines)]
+fn check_addr_of_expr(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ method_name: Symbol,
+ method_def_id: DefId,
+ receiver: &Expr<'_>,
+) -> bool {
+ if_chain! {
+ if let Some(parent) = get_parent_expr(cx, expr);
+ if let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, _) = parent.kind;
+ let adjustments = cx.typeck_results().expr_adjustments(parent).iter().collect::<Vec<_>>();
+ if let
+ // For matching uses of `Cow::from`
+ [
+ Adjustment {
+ kind: Adjust::Deref(None),
+ target: referent_ty,
+ },
+ Adjustment {
+ kind: Adjust::Borrow(_),
+ target: target_ty,
+ },
+ ]
+ // For matching uses of arrays
+ | [
+ Adjustment {
+ kind: Adjust::Deref(None),
+ target: referent_ty,
+ },
+ Adjustment {
+ kind: Adjust::Borrow(_),
+ ..
+ },
+ Adjustment {
+ kind: Adjust::Pointer(_),
+ target: target_ty,
+ },
+ ]
+ // For matching everything else
+ | [
+ Adjustment {
+ kind: Adjust::Deref(None),
+ target: referent_ty,
+ },
+ Adjustment {
+ kind: Adjust::Deref(Some(OverloadedDeref { .. })),
+ ..
+ },
+ Adjustment {
+ kind: Adjust::Borrow(_),
+ target: target_ty,
+ },
+ ] = adjustments[..];
+ let receiver_ty = cx.typeck_results().expr_ty(receiver);
+ let (target_ty, n_target_refs) = peel_mid_ty_refs(*target_ty);
+ let (receiver_ty, n_receiver_refs) = peel_mid_ty_refs(receiver_ty);
+ // Only flag cases satisfying at least one of the following three conditions:
+ // * the referent and receiver types are distinct
+ // * the referent/receiver type is a copyable array
+ // * the method is `Cow::into_owned`
+ // This restriction is to ensure there is no overlap between `redundant_clone` and this
+ // lint. It also avoids the following false positive:
+ // https://github.com/rust-lang/rust-clippy/issues/8759
+ // Arrays are a bit of a corner case. Non-copyable arrays are handled by
+ // `redundant_clone`, but copyable arrays are not.
+ if *referent_ty != receiver_ty
+ || (matches!(referent_ty.kind(), ty::Array(..)) && is_copy(cx, *referent_ty))
+ || is_cow_into_owned(cx, method_name, method_def_id);
+ if let Some(receiver_snippet) = snippet_opt(cx, receiver.span);
+ then {
+ if receiver_ty == target_ty && n_target_refs >= n_receiver_refs {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ parent.span,
+ &format!("unnecessary use of `{method_name}`"),
+ "use",
+ format!(
+ "{:&>width$}{receiver_snippet}",
+ "",
+ width = n_target_refs - n_receiver_refs
+ ),
+ Applicability::MachineApplicable,
+ );
+ return true;
+ }
+ if_chain! {
+ if let Some(deref_trait_id) = cx.tcx.get_diagnostic_item(sym::Deref);
+ if implements_trait(cx, receiver_ty, deref_trait_id, &[]);
+ if get_associated_type(cx, receiver_ty, deref_trait_id, "Target") == Some(target_ty);
+ then {
+ if n_receiver_refs > 0 {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ parent.span,
+ &format!("unnecessary use of `{method_name}`"),
+ "use",
+ receiver_snippet,
+ Applicability::MachineApplicable,
+ );
+ } else {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ expr.span.with_lo(receiver.span.hi()),
+ &format!("unnecessary use of `{method_name}`"),
+ "remove this",
+ String::new(),
+ Applicability::MachineApplicable,
+ );
+ }
+ return true;
+ }
+ }
+ if_chain! {
+ if let Some(as_ref_trait_id) = cx.tcx.get_diagnostic_item(sym::AsRef);
+ if implements_trait(cx, receiver_ty, as_ref_trait_id, &[GenericArg::from(target_ty)]);
+ then {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ parent.span,
+ &format!("unnecessary use of `{method_name}`"),
+ "use",
+ format!("{receiver_snippet}.as_ref()"),
+ Applicability::MachineApplicable,
+ );
+ return true;
+ }
+ }
+ }
+ }
+ false
+}
+
+/// Checks whether `expr` is an argument in an `into_iter` call and, if so, determines whether its
+/// call of a `to_owned`-like function is unnecessary.
+fn check_into_iter_call_arg(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ method_name: Symbol,
+ receiver: &Expr<'_>,
+ msrv: Option<RustcVersion>,
+) -> bool {
+ if_chain! {
+ if let Some(parent) = get_parent_expr(cx, expr);
+ if let Some(callee_def_id) = fn_def_id(cx, parent);
+ if is_into_iter(cx, callee_def_id);
+ if let Some(iterator_trait_id) = cx.tcx.get_diagnostic_item(sym::Iterator);
+ let parent_ty = cx.typeck_results().expr_ty(parent);
+ if implements_trait(cx, parent_ty, iterator_trait_id, &[]);
+ if let Some(item_ty) = get_iterator_item_ty(cx, parent_ty);
+ if let Some(receiver_snippet) = snippet_opt(cx, receiver.span);
+ then {
+ if unnecessary_iter_cloned::check_for_loop_iter(cx, parent, method_name, receiver, true) {
+ return true;
+ }
+ let cloned_or_copied = if is_copy(cx, item_ty) && meets_msrv(msrv, msrvs::ITERATOR_COPIED) {
+ "copied"
+ } else {
+ "cloned"
+ };
+ // The next suggestion may be incorrect because the removal of the `to_owned`-like
+ // function could cause the iterator to hold a reference to a resource that is used
+ // mutably. See https://github.com/rust-lang/rust-clippy/issues/8148.
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ parent.span,
+ &format!("unnecessary use of `{method_name}`"),
+ "use",
+ format!("{receiver_snippet}.iter().{cloned_or_copied}()"),
+ Applicability::MaybeIncorrect,
+ );
+ return true;
+ }
+ }
+ false
+}
+
+/// Checks whether `expr` is an argument in a function call and, if so, determines whether its call
+/// of a `to_owned`-like function is unnecessary.
+fn check_other_call_arg<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'tcx>,
+ method_name: Symbol,
+ receiver: &'tcx Expr<'tcx>,
+) -> bool {
+ if_chain! {
+ if let Some((maybe_call, maybe_arg)) = skip_addr_of_ancestors(cx, expr);
+ if let Some((callee_def_id, _, recv, call_args)) = get_callee_substs_and_args(cx, maybe_call);
+ let fn_sig = cx.tcx.fn_sig(callee_def_id).skip_binder();
+ if let Some(i) = recv.into_iter().chain(call_args).position(|arg| arg.hir_id == maybe_arg.hir_id);
+ if let Some(input) = fn_sig.inputs().get(i);
+ let (input, n_refs) = peel_mid_ty_refs(*input);
+ if let (trait_predicates, _) = get_input_traits_and_projections(cx, callee_def_id, input);
+ if let Some(sized_def_id) = cx.tcx.lang_items().sized_trait();
+ if let [trait_predicate] = trait_predicates
+ .iter()
+ .filter(|trait_predicate| trait_predicate.def_id() != sized_def_id)
+ .collect::<Vec<_>>()[..];
+ if let Some(deref_trait_id) = cx.tcx.get_diagnostic_item(sym::Deref);
+ if let Some(as_ref_trait_id) = cx.tcx.get_diagnostic_item(sym::AsRef);
+ if trait_predicate.def_id() == deref_trait_id || trait_predicate.def_id() == as_ref_trait_id;
+ let receiver_ty = cx.typeck_results().expr_ty(receiver);
+ if can_change_type(cx, maybe_arg, receiver_ty);
+ // We can't add an `&` when the trait is `Deref` because `Target = &T` won't match
+ // `Target = T`.
+ if n_refs > 0 || is_copy(cx, receiver_ty) || trait_predicate.def_id() != deref_trait_id;
+ let n_refs = max(n_refs, usize::from(!is_copy(cx, receiver_ty)));
+ if let Some(receiver_snippet) = snippet_opt(cx, receiver.span);
+ then {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_TO_OWNED,
+ maybe_arg.span,
+ &format!("unnecessary use of `{method_name}`"),
+ "use",
+ format!("{:&>n_refs$}{receiver_snippet}", ""),
+ Applicability::MachineApplicable,
+ );
+ return true;
+ }
+ }
+ false
+}
+
+/// Walks an expression's ancestors until it finds a non-`AddrOf` expression. Returns the first such
+/// expression found (if any) along with the immediately prior expression.
+fn skip_addr_of_ancestors<'tcx>(
+ cx: &LateContext<'tcx>,
+ mut expr: &'tcx Expr<'tcx>,
+) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> {
+ while let Some(parent) = get_parent_expr(cx, expr) {
+ if let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, _) = parent.kind {
+ expr = parent;
+ } else {
+ return Some((parent, expr));
+ }
+ }
+ None
+}
+
+/// Checks whether an expression is a function or method call and, if so, returns its `DefId`,
+/// `Substs`, and arguments.
+fn get_callee_substs_and_args<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'tcx>,
+) -> Option<(DefId, SubstsRef<'tcx>, Option<&'tcx Expr<'tcx>>, &'tcx [Expr<'tcx>])> {
+ if_chain! {
+ if let ExprKind::Call(callee, args) = expr.kind;
+ let callee_ty = cx.typeck_results().expr_ty(callee);
+ if let ty::FnDef(callee_def_id, _) = callee_ty.kind();
+ then {
+ let substs = cx.typeck_results().node_substs(callee.hir_id);
+ return Some((*callee_def_id, substs, None, args));
+ }
+ }
+ if_chain! {
+ if let ExprKind::MethodCall(_, recv, args, _) = expr.kind;
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ then {
+ let substs = cx.typeck_results().node_substs(expr.hir_id);
+ return Some((method_def_id, substs, Some(recv), args));
+ }
+ }
+ None
+}
+
+/// Returns the `TraitPredicate`s and `ProjectionPredicate`s for a function's input type.
+fn get_input_traits_and_projections<'tcx>(
+ cx: &LateContext<'tcx>,
+ callee_def_id: DefId,
+ input: Ty<'tcx>,
+) -> (Vec<TraitPredicate<'tcx>>, Vec<ProjectionPredicate<'tcx>>) {
+ let mut trait_predicates = Vec::new();
+ let mut projection_predicates = Vec::new();
+ for predicate in cx.tcx.param_env(callee_def_id).caller_bounds() {
+ match predicate.kind().skip_binder() {
+ PredicateKind::Trait(trait_predicate) => {
+ if trait_predicate.trait_ref.self_ty() == input {
+ trait_predicates.push(trait_predicate);
+ }
+ },
+ PredicateKind::Projection(projection_predicate) => {
+ if projection_predicate.projection_ty.self_ty() == input {
+ projection_predicates.push(projection_predicate);
+ }
+ },
+ _ => {},
+ }
+ }
+ (trait_predicates, projection_predicates)
+}
+
+fn can_change_type<'a>(cx: &LateContext<'a>, mut expr: &'a Expr<'a>, mut ty: Ty<'a>) -> bool {
+ for (_, node) in cx.tcx.hir().parent_iter(expr.hir_id) {
+ match node {
+ Node::Stmt(_) => return true,
+ Node::Block(..) => continue,
+ Node::Item(item) => {
+ if let ItemKind::Fn(_, _, body_id) = &item.kind
+ && let output_ty = return_ty(cx, item.hir_id())
+ && let local_def_id = cx.tcx.hir().local_def_id(item.hir_id())
+ && Inherited::build(cx.tcx, local_def_id).enter(|inherited| {
++ let fn_ctxt = FnCtxt::new(inherited, cx.param_env, item.hir_id());
+ fn_ctxt.can_coerce(ty, output_ty)
+ }) {
+ if has_lifetime(output_ty) && has_lifetime(ty) {
+ return false;
+ }
+ let body = cx.tcx.hir().body(*body_id);
+ let body_expr = &body.value;
+ let mut count = 0;
+ return find_all_ret_expressions(cx, body_expr, |_| { count += 1; count <= 1 });
+ }
+ }
+ Node::Expr(parent_expr) => {
+ if let Some((callee_def_id, call_substs, recv, call_args)) = get_callee_substs_and_args(cx, parent_expr)
+ {
+ if cx.tcx.lang_items().require(LangItem::IntoFutureIntoFuture) == Ok(callee_def_id) {
+ return false;
+ }
+
+ let fn_sig = cx.tcx.fn_sig(callee_def_id).skip_binder();
+ if let Some(arg_index) = recv.into_iter().chain(call_args).position(|arg| arg.hir_id == expr.hir_id)
+ && let Some(param_ty) = fn_sig.inputs().get(arg_index)
+ && let ty::Param(ParamTy { index: param_index , ..}) = param_ty.kind()
+ {
+ if fn_sig
+ .inputs()
+ .iter()
+ .enumerate()
+ .filter(|(i, _)| *i != arg_index)
+ .any(|(_, ty)| ty.contains(*param_ty))
+ {
+ return false;
+ }
+
+ let mut trait_predicates = cx.tcx.param_env(callee_def_id)
+ .caller_bounds().iter().filter(|predicate| {
+ if let PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder()
+ && trait_predicate.trait_ref.self_ty() == *param_ty {
+ true
+ } else {
+ false
+ }
+ });
+
+ let new_subst = cx.tcx.mk_substs(
+ call_substs.iter()
+ .enumerate()
+ .map(|(i, t)|
+ if i == (*param_index as usize) {
+ GenericArg::from(ty)
+ } else {
+ t
+ }));
+
+ if trait_predicates.any(|predicate| {
+ let predicate = EarlyBinder(predicate).subst(cx.tcx, new_subst);
+ let obligation = Obligation::new(ObligationCause::dummy(), cx.param_env, predicate);
+ !cx.tcx.infer_ctxt().build().predicate_must_hold_modulo_regions(&obligation)
+ }) {
+ return false;
+ }
+
+ let output_ty = fn_sig.output();
+ if output_ty.contains(*param_ty) {
+ if let Ok(new_ty) = cx.tcx.try_subst_and_normalize_erasing_regions(
+ new_subst, cx.param_env, output_ty) {
+ expr = parent_expr;
+ ty = new_ty;
+ continue;
+ }
+ return false;
+ }
+
+ return true;
+ }
+ } else if let ExprKind::Block(..) = parent_expr.kind {
+ continue;
+ }
+ return false;
+ },
+ _ => return false,
+ }
+ }
+
+ false
+}
+
+fn has_lifetime(ty: Ty<'_>) -> bool {
+ ty.walk().any(|t| matches!(t.unpack(), GenericArgKind::Lifetime(_)))
+}
+
+/// Returns true if the named method is `Iterator::cloned` or `Iterator::copied`.
+fn is_cloned_or_copied(cx: &LateContext<'_>, method_name: Symbol, method_def_id: DefId) -> bool {
+ (method_name.as_str() == "cloned" || method_name.as_str() == "copied")
+ && is_diag_trait_item(cx, method_def_id, sym::Iterator)
+}
+
+/// Returns true if the named method can be used to convert the receiver to its "owned"
+/// representation.
+fn is_to_owned_like<'a>(cx: &LateContext<'a>, call_expr: &Expr<'a>, method_name: Symbol, method_def_id: DefId) -> bool {
+ is_clone_like(cx, method_name.as_str(), method_def_id)
+ || is_cow_into_owned(cx, method_name, method_def_id)
+ || is_to_string_on_string_like(cx, call_expr, method_name, method_def_id)
+}
+
+/// Returns true if the named method is `Cow::into_owned`.
+fn is_cow_into_owned(cx: &LateContext<'_>, method_name: Symbol, method_def_id: DefId) -> bool {
+ method_name.as_str() == "into_owned" && is_diag_item_method(cx, method_def_id, sym::Cow)
+}
+
+/// Returns true if the named method is `ToString::to_string` and it's called on a type that
+/// is string-like i.e. implements `AsRef<str>` or `Deref<str>`.
+fn is_to_string_on_string_like<'a>(
+ cx: &LateContext<'_>,
+ call_expr: &'a Expr<'a>,
+ method_name: Symbol,
+ method_def_id: DefId,
+) -> bool {
+ if method_name != sym::to_string || !is_diag_trait_item(cx, method_def_id, sym::ToString) {
+ return false;
+ }
+
+ if let Some(substs) = cx.typeck_results().node_substs_opt(call_expr.hir_id)
+ && let [generic_arg] = substs.as_slice()
+ && let GenericArgKind::Type(ty) = generic_arg.unpack()
+ && let Some(deref_trait_id) = cx.tcx.get_diagnostic_item(sym::Deref)
+ && let Some(as_ref_trait_id) = cx.tcx.get_diagnostic_item(sym::AsRef)
+ && (implements_trait(cx, ty, deref_trait_id, &[cx.tcx.types.str_.into()]) ||
+ implements_trait(cx, ty, as_ref_trait_id, &[cx.tcx.types.str_.into()])) {
+ true
+ } else {
+ false
+ }
+}
--- /dev/null
- let maybe_last_sep_idx = if let Some(val) = lit_snip.len().checked_sub(suffix.len() + 1) {
- val
- } else {
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use rustc_ast::ast::Lit;
+use rustc_errors::Applicability;
+use rustc_lint::EarlyContext;
+
+use super::{SEPARATED_LITERAL_SUFFIX, UNSEPARATED_LITERAL_SUFFIX};
+
+pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str, suffix: &str, sugg_type: &str) {
++ let Some(maybe_last_sep_idx) = lit_snip.len().checked_sub(suffix.len() + 1) else {
+ return; // It's useless so shouldn't lint.
+ };
+ // Do not lint when literal is unsuffixed.
+ if !suffix.is_empty() {
+ if lit_snip.as_bytes()[maybe_last_sep_idx] == b'_' {
+ span_lint_and_sugg(
+ cx,
+ SEPARATED_LITERAL_SUFFIX,
+ lit.span,
+ &format!("{sugg_type} type suffix should not be separated by an underscore"),
+ "remove the underscore",
+ format!("{}{suffix}", &lit_snip[..maybe_last_sep_idx]),
+ Applicability::MachineApplicable,
+ );
+ } else {
+ span_lint_and_sugg(
+ cx,
+ UNSEPARATED_LITERAL_SUFFIX,
+ lit.span,
+ &format!("{sugg_type} type suffix should be separated by an underscore"),
+ "add an underscore",
+ format!("{}_{suffix}", &lit_snip[..=maybe_last_sep_idx]),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+}
--- /dev/null
- let maybe_last_sep_idx = if let Some(val) = lit_snip.len().checked_sub(suffix.len() + 1) {
- val
- } else {
+use clippy_utils::diagnostics::span_lint;
+use rustc_ast::ast::Lit;
+use rustc_lint::EarlyContext;
+
+use super::MIXED_CASE_HEX_LITERALS;
+
+pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, suffix: &str, lit_snip: &str) {
++ let Some(maybe_last_sep_idx) = lit_snip.len().checked_sub(suffix.len() + 1) else {
+ return; // It's useless so shouldn't lint.
+ };
+ if maybe_last_sep_idx <= 2 {
+ // It's meaningless or causes range error.
+ return;
+ }
+ let mut seen = (false, false);
+ for ch in lit_snip.as_bytes()[2..=maybe_last_sep_idx].iter() {
+ match ch {
+ b'a'..=b'f' => seen.0 = true,
+ b'A'..=b'F' => seen.1 = true,
+ _ => {},
+ }
+ if seen.0 && seen.1 {
+ span_lint(
+ cx,
+ MIXED_CASE_HEX_LITERALS,
+ lit.span,
+ "inconsistent casing in hexadecimal literal",
+ );
+ break;
+ }
+ }
+}
--- /dev/null
- lit_snip.trim_start_matches(|c| c == '_' || c == '0').to_string(),
- Applicability::MaybeIncorrect,
- );
- diag.span_suggestion(
- lit.span,
- "if you mean to use an octal constant, use `0o`",
- format!("0o{}", lit_snip.trim_start_matches(|c| c == '_' || c == '0')),
+use clippy_utils::diagnostics::span_lint_and_then;
+use rustc_ast::ast::Lit;
+use rustc_errors::Applicability;
+use rustc_lint::EarlyContext;
+
+use super::ZERO_PREFIXED_LITERAL;
+
+pub(super) fn check(cx: &EarlyContext<'_>, lit: &Lit, lit_snip: &str) {
++ let trimmed_lit_snip = lit_snip.trim_start_matches(|c| c == '_' || c == '0');
+ span_lint_and_then(
+ cx,
+ ZERO_PREFIXED_LITERAL,
+ lit.span,
+ "this is a decimal constant",
+ |diag| {
+ diag.span_suggestion(
+ lit.span,
+ "if you mean to use a decimal constant, remove the `0` to avoid confusion",
++ trimmed_lit_snip.to_string(),
+ Applicability::MaybeIncorrect,
+ );
++ // do not advise to use octal form if the literal cannot be expressed in base 8.
++ if !lit_snip.contains(|c| c == '8' || c == '9') {
++ diag.span_suggestion(
++ lit.span,
++ "if you mean to use an octal constant, use `0o`",
++ format!("0o{trimmed_lit_snip}"),
++ Applicability::MaybeIncorrect,
++ );
++ }
+ },
+ );
+}
--- /dev/null
- let defid = match path.res {
- Res::Def(DefKind::Struct | DefKind::Enum | DefKind::Union, defid) => defid,
- _ => return,
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::{GenericArg, Item, ItemKind, QPath, Ty, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::GenericParamDefKind;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for type parameters which are positioned inconsistently between
+ /// a type definition and impl block. Specifically, a parameter in an impl
+ /// block which has the same name as a parameter in the type def, but is in
+ /// a different place.
+ ///
+ /// ### Why is this bad?
+ /// Type parameters are determined by their position rather than name.
+ /// Naming type parameters inconsistently may cause you to refer to the
+ /// wrong type parameter.
+ ///
+ /// ### Limitations
+ /// This lint only applies to impl blocks with simple generic params, e.g.
+ /// `A`. If there is anything more complicated, such as a tuple, it will be
+ /// ignored.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Foo<A, B> {
+ /// x: A,
+ /// y: B,
+ /// }
+ /// // inside the impl, B refers to Foo::A
+ /// impl<B, A> Foo<B, A> {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct Foo<A, B> {
+ /// x: A,
+ /// y: B,
+ /// }
+ /// impl<A, B> Foo<A, B> {}
+ /// ```
+ #[clippy::version = "1.63.0"]
+ pub MISMATCHING_TYPE_PARAM_ORDER,
+ pedantic,
+ "type parameter positioned inconsistently between type def and impl block"
+}
+declare_lint_pass!(TypeParamMismatch => [MISMATCHING_TYPE_PARAM_ORDER]);
+
+impl<'tcx> LateLintPass<'tcx> for TypeParamMismatch {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
+ if_chain! {
+ if !item.span.from_expansion();
+ if let ItemKind::Impl(imp) = &item.kind;
+ if let TyKind::Path(QPath::Resolved(_, path)) = &imp.self_ty.kind;
+ if let Some(segment) = path.segments.iter().next();
+ if let Some(generic_args) = segment.args;
+ if !generic_args.args.is_empty();
+ then {
+ // get the name and span of the generic parameters in the Impl
+ let mut impl_params = Vec::new();
+ for p in generic_args.args.iter() {
+ match p {
+ GenericArg::Type(Ty {kind: TyKind::Path(QPath::Resolved(_, path)), ..}) =>
+ impl_params.push((path.segments[0].ident.to_string(), path.span)),
+ GenericArg::Type(_) => return,
+ _ => (),
+ };
+ }
+
+ // find the type that the Impl is for
+ // only lint on struct/enum/union for now
++ let Res::Def(DefKind::Struct | DefKind::Enum | DefKind::Union, defid) = path.res else {
++ return
+ };
+
+ // get the names of the generic parameters in the type
+ let type_params = &cx.tcx.generics_of(defid).params;
+ let type_param_names: Vec<_> = type_params.iter()
+ .filter_map(|p|
+ match p.kind {
+ GenericParamDefKind::Type {..} => Some(p.name.to_string()),
+ _ => None,
+ }
+ ).collect();
+ // hashmap of name -> index for mismatch_param_name
+ let type_param_names_hashmap: FxHashMap<&String, usize> =
+ type_param_names.iter().enumerate().map(|(i, param)| (param, i)).collect();
+
+ let type_name = segment.ident;
+ for (i, (impl_param_name, impl_param_span)) in impl_params.iter().enumerate() {
+ if mismatch_param_name(i, impl_param_name, &type_param_names_hashmap) {
+ let msg = format!("`{type_name}` has a similarly named generic type parameter `{impl_param_name}` in its declaration, but in a different order");
+ let help = format!("try `{}`, or a name that does not conflict with `{type_name}`'s generic params",
+ type_param_names[i]);
+ span_lint_and_help(
+ cx,
+ MISMATCHING_TYPE_PARAM_ORDER,
+ *impl_param_span,
+ &msg,
+ None,
+ &help
+ );
+ }
+ }
+ }
+ }
+ }
+}
+
+// Checks if impl_param_name is the same as one of type_param_names,
+// and is in a different position
+fn mismatch_param_name(i: usize, impl_param_name: &String, type_param_names: &FxHashMap<&String, usize>) -> bool {
+ if let Some(j) = type_param_names.get(impl_param_name) {
+ if i != *j {
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_help;
++use clippy_utils::is_lint_allowed;
++use clippy_utils::macros::span_is_local;
++use rustc_hir::def_id::DefIdMap;
++use rustc_hir::{Impl, Item, ItemKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::ty::AssocItem;
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks if a provided method is used implicitly by a trait
++ /// implementation. A usage example would be a wrapper where every method
++ /// should perform some operation before delegating to the inner type's
++ /// implemenation.
++ ///
++ /// This lint should typically be enabled on a specific trait `impl` item
++ /// rather than globally.
++ ///
++ /// ### Why is this bad?
++ /// Indicates that a method is missing.
++ ///
++ /// ### Example
++ /// ```rust
++ /// trait Trait {
++ /// fn required();
++ ///
++ /// fn provided() {}
++ /// }
++ ///
++ /// # struct Type;
++ /// #[warn(clippy::missing_trait_methods)]
++ /// impl Trait for Type {
++ /// fn required() { /* ... */ }
++ /// }
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// trait Trait {
++ /// fn required();
++ ///
++ /// fn provided() {}
++ /// }
++ ///
++ /// # struct Type;
++ /// #[warn(clippy::missing_trait_methods)]
++ /// impl Trait for Type {
++ /// fn required() { /* ... */ }
++ ///
++ /// fn provided() { /* ... */ }
++ /// }
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub MISSING_TRAIT_METHODS,
++ restriction,
++ "trait implementation uses default provided method"
++}
++declare_lint_pass!(MissingTraitMethods => [MISSING_TRAIT_METHODS]);
++
++impl<'tcx> LateLintPass<'tcx> for MissingTraitMethods {
++ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
++ if !is_lint_allowed(cx, MISSING_TRAIT_METHODS, item.hir_id())
++ && span_is_local(item.span)
++ && let ItemKind::Impl(Impl {
++ items,
++ of_trait: Some(trait_ref),
++ ..
++ }) = item.kind
++ && let Some(trait_id) = trait_ref.trait_def_id()
++ {
++ let mut provided: DefIdMap<&AssocItem> = cx
++ .tcx
++ .provided_trait_methods(trait_id)
++ .map(|assoc| (assoc.def_id, assoc))
++ .collect();
++
++ for impl_item in *items {
++ if let Some(def_id) = impl_item.trait_item_def_id {
++ provided.remove(&def_id);
++ }
++ }
++
++ for assoc in provided.values() {
++ let source_map = cx.tcx.sess.source_map();
++ let definition_span = source_map.guess_head_span(cx.tcx.def_span(assoc.def_id));
++
++ span_lint_and_help(
++ cx,
++ MISSING_TRAIT_METHODS,
++ source_map.guess_head_span(item.span),
++ &format!("missing trait method provided by default: `{}`", assoc.name),
++ Some(definition_span),
++ "implement the method",
++ );
++ }
++ }
++ }
++}
--- /dev/null
- let parent_node = match map.find(parent_id) {
- Some(parent) => parent,
- None => break,
- };
+use clippy_utils::diagnostics::{span_lint, span_lint_and_note};
+use clippy_utils::{get_parent_expr, path_to_local, path_to_local_id};
+use if_chain::if_chain;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{BinOpKind, Block, Expr, ExprKind, Guard, HirId, Local, Node, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for a read and a write to the same variable where
+ /// whether the read occurs before or after the write depends on the evaluation
+ /// order of sub-expressions.
+ ///
+ /// ### Why is this bad?
+ /// It is often confusing to read. As described [here](https://doc.rust-lang.org/reference/expressions.html?highlight=subexpression#evaluation-order-of-operands),
+ /// the operands of these expressions are evaluated before applying the effects of the expression.
+ ///
+ /// ### Known problems
+ /// Code which intentionally depends on the evaluation
+ /// order, or which is correct for any evaluation order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut x = 0;
+ ///
+ /// let a = {
+ /// x = 1;
+ /// 1
+ /// } + x;
+ /// // Unclear whether a is 1 or 2.
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let mut x = 0;
+ /// let tmp = {
+ /// x = 1;
+ /// 1
+ /// };
+ /// let a = tmp + x;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MIXED_READ_WRITE_IN_EXPRESSION,
+ restriction,
+ "whether a variable read occurs before a write depends on sub-expression evaluation order"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for diverging calls that are not match arms or
+ /// statements.
+ ///
+ /// ### Why is this bad?
+ /// It is often confusing to read. In addition, the
+ /// sub-expression evaluation order for Rust is not well documented.
+ ///
+ /// ### Known problems
+ /// Someone might want to use `some_bool || panic!()` as a
+ /// shorthand.
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// # fn b() -> bool { true }
+ /// # fn c() -> bool { true }
+ /// let a = b() || panic!() || c();
+ /// // `c()` is dead, `panic!()` is only called if `b()` returns `false`
+ /// let x = (a, b, c, panic!());
+ /// // can simply be replaced by `panic!()`
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DIVERGING_SUB_EXPRESSION,
+ complexity,
+ "whether an expression contains a diverging sub expression"
+}
+
+declare_lint_pass!(EvalOrderDependence => [MIXED_READ_WRITE_IN_EXPRESSION, DIVERGING_SUB_EXPRESSION]);
+
+impl<'tcx> LateLintPass<'tcx> for EvalOrderDependence {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Find a write to a local variable.
+ let var = if_chain! {
+ if let ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) = expr.kind;
+ if let Some(var) = path_to_local(lhs);
+ if expr.span.desugaring_kind().is_none();
+ then { var } else { return; }
+ };
+ let mut visitor = ReadVisitor {
+ cx,
+ var,
+ write_expr: expr,
+ last_expr: expr,
+ };
+ check_for_unsequenced_reads(&mut visitor);
+ }
+ fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
+ match stmt.kind {
+ StmtKind::Local(local) => {
+ if let Local { init: Some(e), .. } = local {
+ DivergenceVisitor { cx }.visit_expr(e);
+ }
+ },
+ StmtKind::Expr(e) | StmtKind::Semi(e) => DivergenceVisitor { cx }.maybe_walk_expr(e),
+ StmtKind::Item(..) => {},
+ }
+ }
+}
+
+struct DivergenceVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> DivergenceVisitor<'a, 'tcx> {
+ fn maybe_walk_expr(&mut self, e: &'tcx Expr<'_>) {
+ match e.kind {
+ ExprKind::Closure { .. } => {},
+ ExprKind::Match(e, arms, _) => {
+ self.visit_expr(e);
+ for arm in arms {
+ if let Some(Guard::If(if_expr)) = arm.guard {
+ self.visit_expr(if_expr);
+ }
+ // make sure top level arm expressions aren't linted
+ self.maybe_walk_expr(arm.body);
+ }
+ },
+ _ => walk_expr(self, e),
+ }
+ }
+ fn report_diverging_sub_expr(&mut self, e: &Expr<'_>) {
+ span_lint(self.cx, DIVERGING_SUB_EXPRESSION, e.span, "sub-expression diverges");
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for DivergenceVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ match e.kind {
+ ExprKind::Continue(_) | ExprKind::Break(_, _) | ExprKind::Ret(_) => self.report_diverging_sub_expr(e),
+ ExprKind::Call(func, _) => {
+ let typ = self.cx.typeck_results().expr_ty(func);
+ match typ.kind() {
+ ty::FnDef(..) | ty::FnPtr(_) => {
+ let sig = typ.fn_sig(self.cx.tcx);
+ if self.cx.tcx.erase_late_bound_regions(sig).output().kind() == &ty::Never {
+ self.report_diverging_sub_expr(e);
+ }
+ },
+ _ => {},
+ }
+ },
+ ExprKind::MethodCall(..) => {
+ let borrowed_table = self.cx.typeck_results();
+ if borrowed_table.expr_ty(e).is_never() {
+ self.report_diverging_sub_expr(e);
+ }
+ },
+ _ => {
+ // do not lint expressions referencing objects of type `!`, as that required a
+ // diverging expression
+ // to begin with
+ },
+ }
+ self.maybe_walk_expr(e);
+ }
+ fn visit_block(&mut self, _: &'tcx Block<'_>) {
+ // don't continue over blocks, LateLintPass already does that
+ }
+}
+
+/// Walks up the AST from the given write expression (`vis.write_expr`) looking
+/// for reads to the same variable that are unsequenced relative to the write.
+///
+/// This means reads for which there is a common ancestor between the read and
+/// the write such that
+///
+/// * evaluating the ancestor necessarily evaluates both the read and the write (for example, `&x`
+/// and `|| x = 1` don't necessarily evaluate `x`), and
+///
+/// * which one is evaluated first depends on the order of sub-expression evaluation. Blocks, `if`s,
+/// loops, `match`es, and the short-circuiting logical operators are considered to have a defined
+/// evaluation order.
+///
+/// When such a read is found, the lint is triggered.
+fn check_for_unsequenced_reads(vis: &mut ReadVisitor<'_, '_>) {
+ let map = &vis.cx.tcx.hir();
+ let mut cur_id = vis.write_expr.hir_id;
+ loop {
+ let parent_id = map.get_parent_node(cur_id);
+ if parent_id == cur_id {
+ break;
+ }
++ let Some(parent_node) = map.find(parent_id) else { break };
+
+ let stop_early = match parent_node {
+ Node::Expr(expr) => check_expr(vis, expr),
+ Node::Stmt(stmt) => check_stmt(vis, stmt),
+ Node::Item(_) => {
+ // We reached the top of the function, stop.
+ break;
+ },
+ _ => StopEarly::KeepGoing,
+ };
+ match stop_early {
+ StopEarly::Stop => break,
+ StopEarly::KeepGoing => {},
+ }
+
+ cur_id = parent_id;
+ }
+}
+
+/// Whether to stop early for the loop in `check_for_unsequenced_reads`. (If
+/// `check_expr` weren't an independent function, this would be unnecessary and
+/// we could just use `break`).
+enum StopEarly {
+ KeepGoing,
+ Stop,
+}
+
+fn check_expr<'a, 'tcx>(vis: &mut ReadVisitor<'a, 'tcx>, expr: &'tcx Expr<'_>) -> StopEarly {
+ if expr.hir_id == vis.last_expr.hir_id {
+ return StopEarly::KeepGoing;
+ }
+
+ match expr.kind {
+ ExprKind::Array(_)
+ | ExprKind::Tup(_)
+ | ExprKind::MethodCall(..)
+ | ExprKind::Call(_, _)
+ | ExprKind::Assign(..)
+ | ExprKind::Index(_, _)
+ | ExprKind::Repeat(_, _)
+ | ExprKind::Struct(_, _, _) => {
+ walk_expr(vis, expr);
+ },
+ ExprKind::Binary(op, _, _) | ExprKind::AssignOp(op, _, _) => {
+ if op.node == BinOpKind::And || op.node == BinOpKind::Or {
+ // x && y and x || y always evaluate x first, so these are
+ // strictly sequenced.
+ } else {
+ walk_expr(vis, expr);
+ }
+ },
+ ExprKind::Closure { .. } => {
+ // Either
+ //
+ // * `var` is defined in the closure body, in which case we've reached the top of the enclosing
+ // function and can stop, or
+ //
+ // * `var` is captured by the closure, in which case, because evaluating a closure does not evaluate
+ // its body, we don't necessarily have a write, so we need to stop to avoid generating false
+ // positives.
+ //
+ // This is also the only place we need to stop early (grrr).
+ return StopEarly::Stop;
+ },
+ // All other expressions either have only one child or strictly
+ // sequence the evaluation order of their sub-expressions.
+ _ => {},
+ }
+
+ vis.last_expr = expr;
+
+ StopEarly::KeepGoing
+}
+
+fn check_stmt<'a, 'tcx>(vis: &mut ReadVisitor<'a, 'tcx>, stmt: &'tcx Stmt<'_>) -> StopEarly {
+ match stmt.kind {
+ StmtKind::Expr(expr) | StmtKind::Semi(expr) => check_expr(vis, expr),
+ // If the declaration is of a local variable, check its initializer
+ // expression if it has one. Otherwise, keep going.
+ StmtKind::Local(local) => local
+ .init
+ .as_ref()
+ .map_or(StopEarly::KeepGoing, |expr| check_expr(vis, expr)),
+ StmtKind::Item(..) => StopEarly::KeepGoing,
+ }
+}
+
+/// A visitor that looks for reads from a variable.
+struct ReadVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ /// The ID of the variable we're looking for.
+ var: HirId,
+ /// The expressions where the write to the variable occurred (for reporting
+ /// in the lint).
+ write_expr: &'tcx Expr<'tcx>,
+ /// The last (highest in the AST) expression we've checked, so we know not
+ /// to recheck it.
+ last_expr: &'tcx Expr<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for ReadVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if expr.hir_id == self.last_expr.hir_id {
+ return;
+ }
+
+ if path_to_local_id(expr, self.var) {
+ // Check that this is a read, not a write.
+ if !is_in_assignment_position(self.cx, expr) {
+ span_lint_and_note(
+ self.cx,
+ MIXED_READ_WRITE_IN_EXPRESSION,
+ expr.span,
+ &format!("unsequenced read of `{}`", self.cx.tcx.hir().name(self.var)),
+ Some(self.write_expr.span),
+ "whether read occurs before this write depends on evaluation order",
+ );
+ }
+ }
+ match expr.kind {
+ // We're about to descend a closure. Since we don't know when (or
+ // if) the closure will be evaluated, any reads in it might not
+ // occur here (or ever). Like above, bail to avoid false positives.
+ ExprKind::Closure{..} |
+
+ // We want to avoid a false positive when a variable name occurs
+ // only to have its address taken, so we stop here. Technically,
+ // this misses some weird cases, eg.
+ //
+ // ```rust
+ // let mut x = 0;
+ // let a = foo(&{x = 1; x}, x);
+ // ```
+ //
+ // TODO: fix this
+ ExprKind::AddrOf(_, _, _) => {
+ return;
+ }
+ _ => {}
+ }
+
+ walk_expr(self, expr);
+ }
+}
+
+/// Returns `true` if `expr` is the LHS of an assignment, like `expr = ...`.
+fn is_in_assignment_position(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ if let Some(parent) = get_parent_expr(cx, expr) {
+ if let ExprKind::Assign(lhs, ..) = parent.kind {
+ return lhs.hir_id == expr.hir_id;
+ }
+ }
+ false
+}
--- /dev/null
- let expr = match stmt.kind {
- StmtKind::Expr(expr) | StmtKind::Semi(expr) => expr,
- _ => return,
+use rustc_errors::Applicability;
+use rustc_hir::{
+ intravisit::{walk_expr, Visitor},
+ Closure, Expr, ExprKind, Stmt, StmtKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{source_map::Span, sym, Symbol};
+
+use if_chain::if_chain;
+
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::is_trait_method;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::has_iter_method;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `for_each` that would be more simply written as a
+ /// `for` loop.
+ ///
+ /// ### Why is this bad?
+ /// `for_each` may be used after applying iterator transformers like
+ /// `filter` for better readability and performance. It may also be used to fit a simple
+ /// operation on one line.
+ /// But when none of these apply, a simple `for` loop is more idiomatic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let v = vec![0, 1, 2];
+ /// v.iter().for_each(|elem| {
+ /// println!("{}", elem);
+ /// })
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let v = vec![0, 1, 2];
+ /// for elem in v.iter() {
+ /// println!("{}", elem);
+ /// }
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub NEEDLESS_FOR_EACH,
+ pedantic,
+ "using `for_each` where a `for` loop would be simpler"
+}
+
+declare_lint_pass!(NeedlessForEach => [NEEDLESS_FOR_EACH]);
+
+impl<'tcx> LateLintPass<'tcx> for NeedlessForEach {
+ fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
++ let (StmtKind::Expr(expr) | StmtKind::Semi(expr)) = stmt.kind else {
++ return
+ };
+
+ if_chain! {
+ // Check the method name is `for_each`.
+ if let ExprKind::MethodCall(method_name, for_each_recv, [for_each_arg], _) = expr.kind;
+ if method_name.ident.name == Symbol::intern("for_each");
+ // Check `for_each` is an associated function of `Iterator`.
+ if is_trait_method(cx, expr, sym::Iterator);
+ // Checks the receiver of `for_each` is also a method call.
+ if let ExprKind::MethodCall(_, iter_recv, [], _) = for_each_recv.kind;
+ // Skip the lint if the call chain is too long. e.g. `v.field.iter().for_each()` or
+ // `v.foo().iter().for_each()` must be skipped.
+ if matches!(
+ iter_recv.kind,
+ ExprKind::Array(..) | ExprKind::Call(..) | ExprKind::Path(..)
+ );
+ // Checks the type of the `iter` method receiver is NOT a user defined type.
+ if has_iter_method(cx, cx.typeck_results().expr_ty(iter_recv)).is_some();
+ // Skip the lint if the body is not block because this is simpler than `for` loop.
+ // e.g. `v.iter().for_each(f)` is simpler and clearer than using `for` loop.
+ if let ExprKind::Closure(&Closure { body, .. }) = for_each_arg.kind;
+ let body = cx.tcx.hir().body(body);
+ if let ExprKind::Block(..) = body.value.kind;
+ then {
+ let mut ret_collector = RetCollector::default();
+ ret_collector.visit_expr(body.value);
+
+ // Skip the lint if `return` is used in `Loop` in order not to suggest using `'label`.
+ if ret_collector.ret_in_loop {
+ return;
+ }
+
+ let (mut applicability, ret_suggs) = if ret_collector.spans.is_empty() {
+ (Applicability::MachineApplicable, None)
+ } else {
+ (
+ Applicability::MaybeIncorrect,
+ Some(
+ ret_collector
+ .spans
+ .into_iter()
+ .map(|span| (span, "continue".to_string()))
+ .collect(),
+ ),
+ )
+ };
+
+ let sugg = format!(
+ "for {} in {} {}",
+ snippet_with_applicability(cx, body.params[0].pat.span, "..", &mut applicability),
+ snippet_with_applicability(cx, for_each_recv.span, "..", &mut applicability),
+ snippet_with_applicability(cx, body.value.span, "..", &mut applicability),
+ );
+
+ span_lint_and_then(cx, NEEDLESS_FOR_EACH, stmt.span, "needless use of `for_each`", |diag| {
+ diag.span_suggestion(stmt.span, "try", sugg, applicability);
+ if let Some(ret_suggs) = ret_suggs {
+ diag.multipart_suggestion("...and replace `return` with `continue`", ret_suggs, applicability);
+ }
+ })
+ }
+ }
+ }
+}
+
+/// This type plays two roles.
+/// 1. Collect spans of `return` in the closure body.
+/// 2. Detect use of `return` in `Loop` in the closure body.
+///
+/// NOTE: The functionality of this type is similar to
+/// [`clippy_utils::visitors::find_all_ret_expressions`], but we can't use
+/// `find_all_ret_expressions` instead of this type. The reasons are:
+/// 1. `find_all_ret_expressions` passes the argument of `ExprKind::Ret` to a callback, but what we
+/// need here is `ExprKind::Ret` itself.
+/// 2. We can't trace current loop depth with `find_all_ret_expressions`.
+#[derive(Default)]
+struct RetCollector {
+ spans: Vec<Span>,
+ ret_in_loop: bool,
+ loop_depth: u16,
+}
+
+impl<'tcx> Visitor<'tcx> for RetCollector {
+ fn visit_expr(&mut self, expr: &Expr<'_>) {
+ match expr.kind {
+ ExprKind::Ret(..) => {
+ if self.loop_depth > 0 && !self.ret_in_loop {
+ self.ret_in_loop = true;
+ }
+
+ self.spans.push(expr.span);
+ },
+
+ ExprKind::Loop(..) => {
+ self.loop_depth += 1;
+ walk_expr(self, expr);
+ self.loop_depth -= 1;
+ return;
+ },
+
+ _ => {},
+ }
+
+ walk_expr(self, expr);
+ }
+}
--- /dev/null
- use clippy_utils::{self, get_trait_def_id, paths};
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::implements_trait;
-
+use if_chain::if_chain;
+use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of negated comparison operators on types which only implement
+ /// `PartialOrd` (e.g., `f64`).
+ ///
+ /// ### Why is this bad?
+ /// These operators make it easy to forget that the underlying types actually allow not only three
+ /// potential Orderings (Less, Equal, Greater) but also a fourth one (Uncomparable). This is
+ /// especially easy to miss if the operator based comparison result is negated.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = 1.0;
+ /// let b = f64::NAN;
+ ///
+ /// let not_less_or_equal = !(a <= b);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// use std::cmp::Ordering;
+ /// # let a = 1.0;
+ /// # let b = f64::NAN;
+ ///
+ /// let _not_less_or_equal = match a.partial_cmp(&b) {
+ /// None | Some(Ordering::Greater) => true,
+ /// _ => false,
+ /// };
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEG_CMP_OP_ON_PARTIAL_ORD,
+ complexity,
+ "The use of negated comparison operators on partially ordered types may produce confusing code."
+}
+
+declare_lint_pass!(NoNegCompOpForPartialOrd => [NEG_CMP_OP_ON_PARTIAL_ORD]);
+
+impl<'tcx> LateLintPass<'tcx> for NoNegCompOpForPartialOrd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
-
+ if !in_external_macro(cx.sess(), expr.span);
+ if let ExprKind::Unary(UnOp::Not, inner) = expr.kind;
+ if let ExprKind::Binary(ref op, left, _) = inner.kind;
+ if let BinOpKind::Le | BinOpKind::Ge | BinOpKind::Lt | BinOpKind::Gt = op.node;
+
+ then {
- if let Some(id) = get_trait_def_id(cx, &paths::ORD) {
+ let ty = cx.typeck_results().expr_ty(left);
+
+ let implements_ord = {
- clear that the two values could be incomparable"
++ if let Some(id) = cx.tcx.get_diagnostic_item(sym::Ord) {
+ implements_trait(cx, ty, id, &[])
+ } else {
+ return;
+ }
+ };
+
+ let implements_partial_ord = {
+ if let Some(id) = cx.tcx.lang_items().partial_ord_trait() {
+ implements_trait(cx, ty, id, &[])
+ } else {
+ return;
+ }
+ };
+
+ if implements_partial_ord && !implements_ord {
+ span_lint(
+ cx,
+ NEG_CMP_OP_ON_PARTIAL_ORD,
+ expr.span,
+ "the use of negated comparison operators on partially ordered \
+ types produces code that is hard to read and refactor, please \
+ consider using the `partial_cmp` method instead, to make it \
++ clear that the two values could be incomparable",
+ );
+ }
+ }
+ }
+ }
+}
--- /dev/null
- let item_def_id = match cx.qpath_res(qpath, expr.hir_id) {
- Res::Def(DefKind::Const | DefKind::AssocConst, did) => did,
- _ => return,
+//! Checks for uses of const which the type is not `Freeze` (`Cell`-free).
+//!
+//! This lint is **warn** by default.
+
+use std::ptr;
+
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::in_constant;
+use clippy_utils::macros::macro_backtrace;
+use if_chain::if_chain;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::{
+ BodyId, Expr, ExprKind, HirId, Impl, ImplItem, ImplItemKind, Item, ItemKind, Node, TraitItem, TraitItemKind, UnOp,
+};
+use rustc_hir_analysis::hir_ty_to_ty;
+use rustc_lint::{LateContext, LateLintPass, Lint};
+use rustc_middle::mir;
+use rustc_middle::mir::interpret::{ConstValue, ErrorHandled};
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{sym, InnerSpan, Span, DUMMY_SP};
+
+// FIXME: this is a correctness problem but there's no suitable
+// warn-by-default category.
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for declaration of `const` items which is interior
+ /// mutable (e.g., contains a `Cell`, `Mutex`, `AtomicXxxx`, etc.).
+ ///
+ /// ### Why is this bad?
+ /// Consts are copied everywhere they are referenced, i.e.,
+ /// every time you refer to the const a fresh instance of the `Cell` or `Mutex`
+ /// or `AtomicXxxx` will be created, which defeats the whole purpose of using
+ /// these types in the first place.
+ ///
+ /// The `const` should better be replaced by a `static` item if a global
+ /// variable is wanted, or replaced by a `const fn` if a constructor is wanted.
+ ///
+ /// ### Known problems
+ /// A "non-constant" const item is a legacy way to supply an
+ /// initialized value to downstream `static` items (e.g., the
+ /// `std::sync::ONCE_INIT` constant). In this case the use of `const` is legit,
+ /// and this lint should be suppressed.
+ ///
+ /// Even though the lint avoids triggering on a constant whose type has enums that have variants
+ /// with interior mutability, and its value uses non interior mutable variants (see
+ /// [#3962](https://github.com/rust-lang/rust-clippy/issues/3962) and
+ /// [#3825](https://github.com/rust-lang/rust-clippy/issues/3825) for examples);
+ /// it complains about associated constants without default values only based on its types;
+ /// which might not be preferable.
+ /// There're other enums plus associated constants cases that the lint cannot handle.
+ ///
+ /// Types that have underlying or potential interior mutability trigger the lint whether
+ /// the interior mutable field is used or not. See issues
+ /// [#5812](https://github.com/rust-lang/rust-clippy/issues/5812) and
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ ///
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ /// CONST_ATOM.store(6, SeqCst); // the content of the atomic is unchanged
+ /// assert_eq!(CONST_ATOM.load(SeqCst), 12); // because the CONST_ATOM in these lines are distinct
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// static STATIC_ATOM: AtomicUsize = AtomicUsize::new(15);
+ /// STATIC_ATOM.store(9, SeqCst);
+ /// assert_eq!(STATIC_ATOM.load(SeqCst), 9); // use a `static` item to refer to the same instance
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DECLARE_INTERIOR_MUTABLE_CONST,
+ style,
+ "declaring `const` with interior mutability"
+}
+
+// FIXME: this is a correctness problem but there's no suitable
+// warn-by-default category.
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks if `const` items which is interior mutable (e.g.,
+ /// contains a `Cell`, `Mutex`, `AtomicXxxx`, etc.) has been borrowed directly.
+ ///
+ /// ### Why is this bad?
+ /// Consts are copied everywhere they are referenced, i.e.,
+ /// every time you refer to the const a fresh instance of the `Cell` or `Mutex`
+ /// or `AtomicXxxx` will be created, which defeats the whole purpose of using
+ /// these types in the first place.
+ ///
+ /// The `const` value should be stored inside a `static` item.
+ ///
+ /// ### Known problems
+ /// When an enum has variants with interior mutability, use of its non
+ /// interior mutable variants can generate false positives. See issue
+ /// [#3962](https://github.com/rust-lang/rust-clippy/issues/3962)
+ ///
+ /// Types that have underlying or potential interior mutability trigger the lint whether
+ /// the interior mutable field is used or not. See issues
+ /// [#5812](https://github.com/rust-lang/rust-clippy/issues/5812) and
+ /// [#3825](https://github.com/rust-lang/rust-clippy/issues/3825)
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ ///
+ /// CONST_ATOM.store(6, SeqCst); // the content of the atomic is unchanged
+ /// assert_eq!(CONST_ATOM.load(SeqCst), 12); // because the CONST_ATOM in these lines are distinct
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ ///
+ /// static STATIC_ATOM: AtomicUsize = CONST_ATOM;
+ /// STATIC_ATOM.store(9, SeqCst);
+ /// assert_eq!(STATIC_ATOM.load(SeqCst), 9); // use a `static` item to refer to the same instance
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub BORROW_INTERIOR_MUTABLE_CONST,
+ style,
+ "referencing `const` with interior mutability"
+}
+
+fn is_unfrozen<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ // Ignore types whose layout is unknown since `is_freeze` reports every generic types as `!Freeze`,
+ // making it indistinguishable from `UnsafeCell`. i.e. it isn't a tool to prove a type is
+ // 'unfrozen'. However, this code causes a false negative in which
+ // a type contains a layout-unknown type, but also an unsafe cell like `const CELL: Cell<T>`.
+ // Yet, it's better than `ty.has_type_flags(TypeFlags::HAS_TY_PARAM | TypeFlags::HAS_PROJECTION)`
+ // since it works when a pointer indirection involves (`Cell<*const T>`).
+ // Making up a `ParamEnv` where every generic params and assoc types are `Freeze`is another option;
+ // but I'm not sure whether it's a decent way, if possible.
+ cx.tcx.layout_of(cx.param_env.and(ty)).is_ok() && !ty.is_freeze(cx.tcx.at(DUMMY_SP), cx.param_env)
+}
+
+fn is_value_unfrozen_raw<'tcx>(
+ cx: &LateContext<'tcx>,
+ result: Result<ConstValue<'tcx>, ErrorHandled>,
+ ty: Ty<'tcx>,
+) -> bool {
+ fn inner<'tcx>(cx: &LateContext<'tcx>, val: mir::ConstantKind<'tcx>) -> bool {
+ match val.ty().kind() {
+ // the fact that we have to dig into every structs to search enums
+ // leads us to the point checking `UnsafeCell` directly is the only option.
+ ty::Adt(ty_def, ..) if ty_def.is_unsafe_cell() => true,
+ // As of 2022-09-08 miri doesn't track which union field is active so there's no safe way to check the
+ // contained value.
+ ty::Adt(def, ..) if def.is_union() => false,
+ ty::Array(..) | ty::Adt(..) | ty::Tuple(..) => {
+ let val = cx.tcx.destructure_mir_constant(cx.param_env, val);
+ val.fields.iter().any(|field| inner(cx, *field))
+ },
+ _ => false,
+ }
+ }
+ result.map_or_else(
+ |err| {
+ // Consider `TooGeneric` cases as being unfrozen.
+ // This causes a false positive where an assoc const whose type is unfrozen
+ // have a value that is a frozen variant with a generic param (an example is
+ // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::GENERIC_VARIANT`).
+ // However, it prevents a number of false negatives that is, I think, important:
+ // 1. assoc consts in trait defs referring to consts of themselves
+ // (an example is `declare_interior_mutable_const::traits::ConcreteTypes::ANOTHER_ATOMIC`).
+ // 2. a path expr referring to assoc consts whose type is doesn't have
+ // any frozen variants in trait defs (i.e. without substitute for `Self`).
+ // (e.g. borrowing `borrow_interior_mutable_const::trait::ConcreteTypes::ATOMIC`)
+ // 3. similar to the false positive above;
+ // but the value is an unfrozen variant, or the type has no enums. (An example is
+ // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::UNFROZEN_VARIANT`
+ // and `declare_interior_mutable_const::enums::BothOfCellAndGeneric::NO_ENUM`).
+ // One might be able to prevent these FNs correctly, and replace this with `false`;
+ // e.g. implementing `has_frozen_variant` described above, and not running this function
+ // when the type doesn't have any frozen variants would be the 'correct' way for the 2nd
+ // case (that actually removes another suboptimal behavior (I won't say 'false positive') where,
+ // similar to 2., but with the a frozen variant) (e.g. borrowing
+ // `borrow_interior_mutable_const::enums::AssocConsts::TO_BE_FROZEN_VARIANT`).
+ // I chose this way because unfrozen enums as assoc consts are rare (or, hopefully, none).
+ err == ErrorHandled::TooGeneric
+ },
+ |val| inner(cx, mir::ConstantKind::from_value(val, ty)),
+ )
+}
+
+fn is_value_unfrozen_poly<'tcx>(cx: &LateContext<'tcx>, body_id: BodyId, ty: Ty<'tcx>) -> bool {
+ let result = cx.tcx.const_eval_poly(body_id.hir_id.owner.to_def_id());
+ is_value_unfrozen_raw(cx, result, ty)
+}
+
+fn is_value_unfrozen_expr<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId, def_id: DefId, ty: Ty<'tcx>) -> bool {
+ let substs = cx.typeck_results().node_substs(hir_id);
+
+ let result = cx.tcx.const_eval_resolve(
+ cx.param_env,
+ mir::UnevaluatedConst::new(ty::WithOptConstParam::unknown(def_id), substs),
+ None,
+ );
+ is_value_unfrozen_raw(cx, result, ty)
+}
+
+#[derive(Copy, Clone)]
+enum Source {
+ Item { item: Span },
+ Assoc { item: Span },
+ Expr { expr: Span },
+}
+
+impl Source {
+ #[must_use]
+ fn lint(&self) -> (&'static Lint, &'static str, Span) {
+ match self {
+ Self::Item { item } | Self::Assoc { item, .. } => (
+ DECLARE_INTERIOR_MUTABLE_CONST,
+ "a `const` item should never be interior mutable",
+ *item,
+ ),
+ Self::Expr { expr } => (
+ BORROW_INTERIOR_MUTABLE_CONST,
+ "a `const` item with interior mutability should not be borrowed",
+ *expr,
+ ),
+ }
+ }
+}
+
+fn lint(cx: &LateContext<'_>, source: Source) {
+ let (lint, msg, span) = source.lint();
+ span_lint_and_then(cx, lint, span, msg, |diag| {
+ if span.from_expansion() {
+ return; // Don't give suggestions into macros.
+ }
+ match source {
+ Source::Item { .. } => {
+ let const_kw_span = span.from_inner(InnerSpan::new(0, 5));
+ diag.span_label(const_kw_span, "make this a static item (maybe with lazy_static)");
+ },
+ Source::Assoc { .. } => (),
+ Source::Expr { .. } => {
+ diag.help("assign this const to a local or static variable, and use the variable here");
+ },
+ }
+ });
+}
+
+declare_lint_pass!(NonCopyConst => [DECLARE_INTERIOR_MUTABLE_CONST, BORROW_INTERIOR_MUTABLE_CONST]);
+
+impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx Item<'_>) {
+ if let ItemKind::Const(hir_ty, body_id) = it.kind {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ if !ignored_macro(cx, it) && is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, body_id, ty) {
+ lint(cx, Source::Item { item: it.span });
+ }
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, trait_item: &'tcx TraitItem<'_>) {
+ if let TraitItemKind::Const(hir_ty, body_id_opt) = &trait_item.kind {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+
+ // Normalize assoc types because ones originated from generic params
+ // bounded other traits could have their bound.
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+ if is_unfrozen(cx, normalized)
+ // When there's no default value, lint it only according to its type;
+ // in other words, lint consts whose value *could* be unfrozen, not definitely is.
+ // This feels inconsistent with how the lint treats generic types,
+ // which avoids linting types which potentially become unfrozen.
+ // One could check whether an unfrozen type have a *frozen variant*
+ // (like `body_id_opt.map_or_else(|| !has_frozen_variant(...), ...)`),
+ // and do the same as the case of generic types at impl items.
+ // Note that it isn't sufficient to check if it has an enum
+ // since all of that enum's variants can be unfrozen:
+ // i.e. having an enum doesn't necessary mean a type has a frozen variant.
+ // And, implementing it isn't a trivial task; it'll probably end up
+ // re-implementing the trait predicate evaluation specific to `Freeze`.
+ && body_id_opt.map_or(true, |body_id| is_value_unfrozen_poly(cx, body_id, normalized))
+ {
+ lint(cx, Source::Assoc { item: trait_item.span });
+ }
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx ImplItem<'_>) {
+ if let ImplItemKind::Const(hir_ty, body_id) = &impl_item.kind {
+ let item_def_id = cx.tcx.hir().get_parent_item(impl_item.hir_id()).def_id;
+ let item = cx.tcx.hir().expect_item(item_def_id);
+
+ match &item.kind {
+ ItemKind::Impl(Impl {
+ of_trait: Some(of_trait_ref),
+ ..
+ }) => {
+ if_chain! {
+ // Lint a trait impl item only when the definition is a generic type,
+ // assuming an assoc const is not meant to be an interior mutable type.
+ if let Some(of_trait_def_id) = of_trait_ref.trait_def_id();
+ if let Some(of_assoc_item) = cx
+ .tcx
+ .associated_item(impl_item.def_id)
+ .trait_item_def_id;
+ if cx
+ .tcx
+ .layout_of(cx.tcx.param_env(of_trait_def_id).and(
+ // Normalize assoc types because ones originated from generic params
+ // bounded other traits could have their bound at the trait defs;
+ // and, in that case, the definition is *not* generic.
+ cx.tcx.normalize_erasing_regions(
+ cx.tcx.param_env(of_trait_def_id),
+ cx.tcx.type_of(of_assoc_item),
+ ),
+ ))
+ .is_err();
+ // If there were a function like `has_frozen_variant` described above,
+ // we should use here as a frozen variant is a potential to be frozen
+ // similar to unknown layouts.
+ // e.g. `layout_of(...).is_err() || has_frozen_variant(...);`
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+ if is_unfrozen(cx, normalized);
+ if is_value_unfrozen_poly(cx, *body_id, normalized);
+ then {
+ lint(
+ cx,
+ Source::Assoc {
+ item: impl_item.span,
+ },
+ );
+ }
+ }
+ },
+ ItemKind::Impl(Impl { of_trait: None, .. }) => {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ // Normalize assoc types originated from generic params.
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+
+ if is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, *body_id, normalized) {
+ lint(cx, Source::Assoc { item: impl_item.span });
+ }
+ },
+ _ => (),
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Path(qpath) = &expr.kind {
+ // Only lint if we use the const item inside a function.
+ if in_constant(cx, expr.hir_id) {
+ return;
+ }
+
+ // Make sure it is a const item.
++ let Res::Def(DefKind::Const | DefKind::AssocConst, item_def_id) = cx.qpath_res(qpath, expr.hir_id) else {
++ return
+ };
+
+ // Climb up to resolve any field access and explicit referencing.
+ let mut cur_expr = expr;
+ let mut dereferenced_expr = expr;
+ let mut needs_check_adjustment = true;
+ loop {
+ let parent_id = cx.tcx.hir().get_parent_node(cur_expr.hir_id);
+ if parent_id == cur_expr.hir_id {
+ break;
+ }
+ if let Some(Node::Expr(parent_expr)) = cx.tcx.hir().find(parent_id) {
+ match &parent_expr.kind {
+ ExprKind::AddrOf(..) => {
+ // `&e` => `e` must be referenced.
+ needs_check_adjustment = false;
+ },
+ ExprKind::Field(..) => {
+ needs_check_adjustment = true;
+
+ // Check whether implicit dereferences happened;
+ // if so, no need to go further up
+ // because of the same reason as the `ExprKind::Unary` case.
+ if cx
+ .typeck_results()
+ .expr_adjustments(dereferenced_expr)
+ .iter()
+ .any(|adj| matches!(adj.kind, Adjust::Deref(_)))
+ {
+ break;
+ }
+
+ dereferenced_expr = parent_expr;
+ },
+ ExprKind::Index(e, _) if ptr::eq(&**e, cur_expr) => {
+ // `e[i]` => desugared to `*Index::index(&e, i)`,
+ // meaning `e` must be referenced.
+ // no need to go further up since a method call is involved now.
+ needs_check_adjustment = false;
+ break;
+ },
+ ExprKind::Unary(UnOp::Deref, _) => {
+ // `*e` => desugared to `*Deref::deref(&e)`,
+ // meaning `e` must be referenced.
+ // no need to go further up since a method call is involved now.
+ needs_check_adjustment = false;
+ break;
+ },
+ _ => break,
+ }
+ cur_expr = parent_expr;
+ } else {
+ break;
+ }
+ }
+
+ let ty = if needs_check_adjustment {
+ let adjustments = cx.typeck_results().expr_adjustments(dereferenced_expr);
+ if let Some(i) = adjustments
+ .iter()
+ .position(|adj| matches!(adj.kind, Adjust::Borrow(_) | Adjust::Deref(_)))
+ {
+ if i == 0 {
+ cx.typeck_results().expr_ty(dereferenced_expr)
+ } else {
+ adjustments[i - 1].target
+ }
+ } else {
+ // No borrow adjustments means the entire const is moved.
+ return;
+ }
+ } else {
+ cx.typeck_results().expr_ty(dereferenced_expr)
+ };
+
+ if is_unfrozen(cx, ty) && is_value_unfrozen_expr(cx, expr.hir_id, item_def_id, ty) {
+ lint(cx, Source::Expr { expr: expr.span });
+ }
+ }
+ }
+}
+
+fn ignored_macro(cx: &LateContext<'_>, it: &rustc_hir::Item<'_>) -> bool {
+ macro_backtrace(it.span).any(|macro_call| {
+ matches!(
+ cx.tcx.get_diagnostic_name(macro_call.def_id),
+ Some(sym::thread_local_macro)
+ )
+ })
+}
--- /dev/null
- let snip = match snippet_opt(cx, param.span) {
- Some(s) => s,
- _ => return,
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{snippet_opt, snippet_with_applicability};
+use clippy_utils::ty::{is_type_diagnostic_item, match_type};
+use clippy_utils::{match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for non-octal values used to set Unix file permissions.
+ ///
+ /// ### Why is this bad?
+ /// They will be converted into octal, creating potentially
+ /// unintended file permissions.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// use std::fs::OpenOptions;
+ /// use std::os::unix::fs::OpenOptionsExt;
+ ///
+ /// let mut options = OpenOptions::new();
+ /// options.mode(644);
+ /// ```
+ /// Use instead:
+ /// ```rust,ignore
+ /// use std::fs::OpenOptions;
+ /// use std::os::unix::fs::OpenOptionsExt;
+ ///
+ /// let mut options = OpenOptions::new();
+ /// options.mode(0o644);
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub NON_OCTAL_UNIX_PERMISSIONS,
+ correctness,
+ "use of non-octal value to set unix file permissions, which will be translated into octal"
+}
+
+declare_lint_pass!(NonOctalUnixPermissions => [NON_OCTAL_UNIX_PERMISSIONS]);
+
+impl<'tcx> LateLintPass<'tcx> for NonOctalUnixPermissions {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ match &expr.kind {
+ ExprKind::MethodCall(path, func, [param], _) => {
+ let obj_ty = cx.typeck_results().expr_ty(func).peel_refs();
+
+ if_chain! {
+ if (path.ident.name == sym!(mode)
+ && (match_type(cx, obj_ty, &paths::OPEN_OPTIONS)
+ || is_type_diagnostic_item(cx, obj_ty, sym::DirBuilder)))
+ || (path.ident.name == sym!(set_mode) && match_type(cx, obj_ty, &paths::PERMISSIONS));
+ if let ExprKind::Lit(_) = param.kind;
+
+ then {
-
++ let Some(snip) = snippet_opt(cx, param.span) else {
++ return
+ };
+
+ if !snip.starts_with("0o") {
+ show_error(cx, param);
+ }
+ }
+ }
+ },
+ ExprKind::Call(func, [param]) => {
+ if_chain! {
+ if let ExprKind::Path(ref path) = func.kind;
+ if let Some(def_id) = cx.qpath_res(path, func.hir_id).opt_def_id();
+ if match_def_path(cx, def_id, &paths::PERMISSIONS_FROM_MODE);
+ if let ExprKind::Lit(_) = param.kind;
- let snip = match snippet_opt(cx, param.span) {
- Some(s) => s,
- _ => return,
- };
-
- if !snip.starts_with("0o") {
- show_error(cx, param);
- }
++ if let Some(snip) = snippet_opt(cx, param.span);
++ if !snip.starts_with("0o");
+ then {
++ show_error(cx, param);
+ }
+ }
+ },
+ _ => {},
+ };
+ }
+}
+
+fn show_error(cx: &LateContext<'_>, param: &Expr<'_>) {
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ NON_OCTAL_UNIX_PERMISSIONS,
+ param.span,
+ "using a non-octal value to set unix file permissions",
+ "consider using an octal literal instead",
+ format!(
+ "0o{}",
+ snippet_with_applicability(cx, param.span, "0o..", &mut applicability,),
+ ),
+ applicability,
+ );
+}
--- /dev/null
- .ok_or_else(|| de::Error::custom(&format!("expected one of `(`, `{{`, `[` found `{brace}`")))?,
+use std::{
+ fmt,
+ hash::{Hash, Hasher},
+};
+
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_opt;
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::hygiene::{ExpnKind, MacroKind};
+use rustc_span::Span;
+use serde::{de, Deserialize};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks that common macros are used with consistent bracing.
+ ///
+ /// ### Why is this bad?
+ /// This is mostly a consistency lint although using () or []
+ /// doesn't give you a semicolon in item position, which can be unexpected.
+ ///
+ /// ### Example
+ /// ```rust
+ /// vec!{1, 2, 3};
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// vec![1, 2, 3];
+ /// ```
+ #[clippy::version = "1.55.0"]
+ pub NONSTANDARD_MACRO_BRACES,
+ nursery,
+ "check consistent use of braces in macro"
+}
+
+const BRACES: &[(&str, &str)] = &[("(", ")"), ("{", "}"), ("[", "]")];
+
+/// The (callsite span, (open brace, close brace), source snippet)
+type MacroInfo<'a> = (Span, &'a (String, String), String);
+
+#[derive(Clone, Debug, Default)]
+pub struct MacroBraces {
+ macro_braces: FxHashMap<String, (String, String)>,
+ done: FxHashSet<Span>,
+}
+
+impl MacroBraces {
+ pub fn new(conf: &FxHashSet<MacroMatcher>) -> Self {
+ let macro_braces = macro_braces(conf.clone());
+ Self {
+ macro_braces,
+ done: FxHashSet::default(),
+ }
+ }
+}
+
+impl_lint_pass!(MacroBraces => [NONSTANDARD_MACRO_BRACES]);
+
+impl EarlyLintPass for MacroBraces {
+ fn check_item(&mut self, cx: &EarlyContext<'_>, item: &ast::Item) {
+ if let Some((span, braces, snip)) = is_offending_macro(cx, item.span, self) {
+ emit_help(cx, &snip, braces, span);
+ self.done.insert(span);
+ }
+ }
+
+ fn check_stmt(&mut self, cx: &EarlyContext<'_>, stmt: &ast::Stmt) {
+ if let Some((span, braces, snip)) = is_offending_macro(cx, stmt.span, self) {
+ emit_help(cx, &snip, braces, span);
+ self.done.insert(span);
+ }
+ }
+
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) {
+ if let Some((span, braces, snip)) = is_offending_macro(cx, expr.span, self) {
+ emit_help(cx, &snip, braces, span);
+ self.done.insert(span);
+ }
+ }
+
+ fn check_ty(&mut self, cx: &EarlyContext<'_>, ty: &ast::Ty) {
+ if let Some((span, braces, snip)) = is_offending_macro(cx, ty.span, self) {
+ emit_help(cx, &snip, braces, span);
+ self.done.insert(span);
+ }
+ }
+}
+
+fn is_offending_macro<'a>(cx: &EarlyContext<'_>, span: Span, mac_braces: &'a MacroBraces) -> Option<MacroInfo<'a>> {
+ let unnested_or_local = || {
+ !span.ctxt().outer_expn_data().call_site.from_expansion()
+ || span
+ .macro_backtrace()
+ .last()
+ .map_or(false, |e| e.macro_def_id.map_or(false, DefId::is_local))
+ };
+ let span_call_site = span.ctxt().outer_expn_data().call_site;
+ if_chain! {
+ if let ExpnKind::Macro(MacroKind::Bang, mac_name) = span.ctxt().outer_expn_data().kind;
+ let name = mac_name.as_str();
+ if let Some(braces) = mac_braces.macro_braces.get(name);
+ if let Some(snip) = snippet_opt(cx, span_call_site);
+ // we must check only invocation sites
+ // https://github.com/rust-lang/rust-clippy/issues/7422
+ if snip.starts_with(&format!("{name}!"));
+ if unnested_or_local();
+ // make formatting consistent
+ let c = snip.replace(' ', "");
+ if !c.starts_with(&format!("{name}!{}", braces.0));
+ if !mac_braces.done.contains(&span_call_site);
+ then {
+ Some((span_call_site, braces, snip))
+ } else {
+ None
+ }
+ }
+}
+
+fn emit_help(cx: &EarlyContext<'_>, snip: &str, braces: &(String, String), span: Span) {
+ if let Some((macro_name, macro_args_str)) = snip.split_once('!') {
+ let mut macro_args = macro_args_str.trim().to_string();
+ // now remove the wrong braces
+ macro_args.remove(0);
+ macro_args.pop();
+ span_lint_and_sugg(
+ cx,
+ NONSTANDARD_MACRO_BRACES,
+ span,
+ &format!("use of irregular braces for `{macro_name}!` macro"),
+ "consider writing",
+ format!("{macro_name}!{}{macro_args}{}", braces.0, braces.1),
+ Applicability::MachineApplicable,
+ );
+ }
+}
+
+fn macro_braces(conf: FxHashSet<MacroMatcher>) -> FxHashMap<String, (String, String)> {
+ let mut braces = vec![
+ macro_matcher!(
+ name: "print",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "println",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "eprint",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "eprintln",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "write",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "writeln",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "format",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "format_args",
+ braces: ("(", ")"),
+ ),
+ macro_matcher!(
+ name: "vec",
+ braces: ("[", "]"),
+ ),
+ macro_matcher!(
+ name: "matches",
+ braces: ("(", ")"),
+ ),
+ ]
+ .into_iter()
+ .collect::<FxHashMap<_, _>>();
+ // We want users items to override any existing items
+ for it in conf {
+ braces.insert(it.name, it.braces);
+ }
+ braces
+}
+
+macro_rules! macro_matcher {
+ (name: $name:expr, braces: ($open:expr, $close:expr) $(,)?) => {
+ ($name.to_owned(), ($open.to_owned(), $close.to_owned()))
+ };
+}
+pub(crate) use macro_matcher;
+
+#[derive(Clone, Debug)]
+pub struct MacroMatcher {
+ name: String,
+ braces: (String, String),
+}
+
+impl Hash for MacroMatcher {
+ fn hash<H: Hasher>(&self, state: &mut H) {
+ self.name.hash(state);
+ }
+}
+
+impl PartialEq for MacroMatcher {
+ fn eq(&self, other: &Self) -> bool {
+ self.name == other.name
+ }
+}
+impl Eq for MacroMatcher {}
+
+impl<'de> Deserialize<'de> for MacroMatcher {
+ fn deserialize<D>(deser: D) -> Result<Self, D::Error>
+ where
+ D: de::Deserializer<'de>,
+ {
+ #[derive(Deserialize)]
+ #[serde(field_identifier, rename_all = "lowercase")]
+ enum Field {
+ Name,
+ Brace,
+ }
+ struct MacVisitor;
+ impl<'de> de::Visitor<'de> for MacVisitor {
+ type Value = MacroMatcher;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ formatter.write_str("struct MacroMatcher")
+ }
+
+ fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error>
+ where
+ V: de::MapAccess<'de>,
+ {
+ let mut name = None;
+ let mut brace: Option<&str> = None;
+ while let Some(key) = map.next_key()? {
+ match key {
+ Field::Name => {
+ if name.is_some() {
+ return Err(de::Error::duplicate_field("name"));
+ }
+ name = Some(map.next_value()?);
+ },
+ Field::Brace => {
+ if brace.is_some() {
+ return Err(de::Error::duplicate_field("brace"));
+ }
+ brace = Some(map.next_value()?);
+ },
+ }
+ }
+ let name = name.ok_or_else(|| de::Error::missing_field("name"))?;
+ let brace = brace.ok_or_else(|| de::Error::missing_field("brace"))?;
+ Ok(MacroMatcher {
+ name,
+ braces: BRACES
+ .iter()
+ .find(|b| b.0 == brace)
+ .map(|(o, c)| ((*o).to_owned(), (*c).to_owned()))
++ .ok_or_else(|| de::Error::custom(format!("expected one of `(`, `{{`, `[` found `{brace}`")))?,
+ })
+ }
+ }
+
+ const FIELDS: &[&str] = &["name", "brace"];
+ deser.deserialize_struct("MacroMatcher", FIELDS, MacVisitor)
+ }
+}
--- /dev/null
- use clippy_utils::{match_any_def_paths, path_def_id, paths};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet;
+use clippy_utils::ty::{implements_trait, is_copy};
- if path_def_id(cx, path)
- .and_then(|id| match_any_def_paths(cx, id, &[&paths::FROM_STR_METHOD, &paths::FROM_FROM]))
- .map_or(false, |idx| match idx {
- 0 => true,
- 1 => !is_copy(cx, typeck.expr_ty(expr)),
- _ => false,
- }) =>
++use clippy_utils::{match_def_path, path_def_id, paths};
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::ty::Ty;
+use rustc_span::symbol::sym;
+
+use super::CMP_OWNED;
+
+pub(super) fn check(cx: &LateContext<'_>, op: BinOpKind, lhs: &Expr<'_>, rhs: &Expr<'_>) {
+ if op.is_comparison() {
+ check_op(cx, lhs, rhs, true);
+ check_op(cx, rhs, lhs, false);
+ }
+}
+
+#[derive(Default)]
+struct EqImpl {
+ ty_eq_other: bool,
+ other_eq_ty: bool,
+}
+impl EqImpl {
+ fn is_implemented(&self) -> bool {
+ self.ty_eq_other || self.other_eq_ty
+ }
+}
+
+fn symmetric_partial_eq<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, other: Ty<'tcx>) -> Option<EqImpl> {
+ cx.tcx.lang_items().eq_trait().map(|def_id| EqImpl {
+ ty_eq_other: implements_trait(cx, ty, def_id, &[other.into()]),
+ other_eq_ty: implements_trait(cx, other, def_id, &[ty.into()]),
+ })
+}
+
+fn check_op(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left: bool) {
+ let typeck = cx.typeck_results();
+ let (arg, arg_span) = match expr.kind {
+ ExprKind::MethodCall(_, arg, [], _)
+ if typeck
+ .type_dependent_def_id(expr.hir_id)
+ .and_then(|id| cx.tcx.trait_of_item(id))
+ .map_or(false, |id| {
+ matches!(cx.tcx.get_diagnostic_name(id), Some(sym::ToString | sym::ToOwned))
+ }) =>
+ {
+ (arg, arg.span)
+ },
+ ExprKind::Call(path, [arg])
++ if path_def_id(cx, path).map_or(false, |id| {
++ if match_def_path(cx, id, &paths::FROM_STR_METHOD) {
++ true
++ } else if cx.tcx.lang_items().from_fn() == Some(id) {
++ !is_copy(cx, typeck.expr_ty(expr))
++ } else {
++ false
++ }
++ }) =>
+ {
+ (arg, arg.span)
+ },
+ _ => return,
+ };
+
+ let arg_ty = typeck.expr_ty(arg);
+ let other_ty = typeck.expr_ty(other);
+
+ let without_deref = symmetric_partial_eq(cx, arg_ty, other_ty).unwrap_or_default();
+ let with_deref = arg_ty
+ .builtin_deref(true)
+ .and_then(|tam| symmetric_partial_eq(cx, tam.ty, other_ty))
+ .unwrap_or_default();
+
+ if !with_deref.is_implemented() && !without_deref.is_implemented() {
+ return;
+ }
+
+ let other_gets_derefed = matches!(other.kind, ExprKind::Unary(UnOp::Deref, _));
+
+ let lint_span = if other_gets_derefed {
+ expr.span.to(other.span)
+ } else {
+ expr.span
+ };
+
+ span_lint_and_then(
+ cx,
+ CMP_OWNED,
+ lint_span,
+ "this creates an owned instance just for comparison",
+ |diag| {
+ // This also catches `PartialEq` implementations that call `to_owned`.
+ if other_gets_derefed {
+ diag.span_label(lint_span, "try implementing the comparison without allocating");
+ return;
+ }
+
+ let arg_snip = snippet(cx, arg_span, "..");
+ let expr_snip;
+ let eq_impl;
+ if with_deref.is_implemented() {
+ expr_snip = format!("*{arg_snip}");
+ eq_impl = with_deref;
+ } else {
+ expr_snip = arg_snip.to_string();
+ eq_impl = without_deref;
+ };
+
+ let span;
+ let hint;
+ if (eq_impl.ty_eq_other && left) || (eq_impl.other_eq_ty && !left) {
+ span = expr.span;
+ hint = expr_snip;
+ } else {
+ span = expr.span.to(other.span);
+
+ let cmp_span = if other.span < expr.span {
+ other.span.between(expr.span)
+ } else {
+ expr.span.between(other.span)
+ };
+ if eq_impl.ty_eq_other {
+ hint = format!(
+ "{expr_snip}{}{}",
+ snippet(cx, cmp_span, ".."),
+ snippet(cx, other.span, "..")
+ );
+ } else {
+ hint = format!(
+ "{}{}{expr_snip}",
+ snippet(cx, other.span, ".."),
+ snippet(cx, cmp_span, "..")
+ );
+ }
+ }
+
+ diag.span_suggestion(
+ span,
+ "try",
+ hint,
+ Applicability::MachineApplicable, // snippet
+ );
+ },
+ );
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_help;
++use rustc_ast::ast::{Item, ItemKind};
++use rustc_lint::{EarlyContext, EarlyLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks whether partial fields of a struct are public.
++ ///
++ /// Either make all fields of a type public, or make none of them public
++ ///
++ /// ### Why is this bad?
++ /// Most types should either be:
++ /// * Abstract data types: complex objects with opaque implementation which guard
++ /// interior invariants and expose intentionally limited API to the outside world.
++ /// * Data: relatively simple objects which group a bunch of related attributes together.
++ ///
++ /// ### Example
++ /// ```rust
++ /// pub struct Color {
++ /// pub r: u8,
++ /// pub g: u8,
++ /// b: u8,
++ /// }
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// pub struct Color {
++ /// pub r: u8,
++ /// pub g: u8,
++ /// pub b: u8,
++ /// }
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub PARTIAL_PUB_FIELDS,
++ restriction,
++ "partial fields of a struct are public"
++}
++declare_lint_pass!(PartialPubFields => [PARTIAL_PUB_FIELDS]);
++
++impl EarlyLintPass for PartialPubFields {
++ fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
++ let ItemKind::Struct(ref st, _) = item.kind else {
++ return;
++ };
++
++ let mut fields = st.fields().iter();
++ let Some(first_field) = fields.next() else {
++ // Empty struct.
++ return;
++ };
++ let all_pub = first_field.vis.kind.is_pub();
++ let all_priv = !all_pub;
++
++ let msg = "mixed usage of pub and non-pub fields";
++
++ for field in fields {
++ if all_priv && field.vis.kind.is_pub() {
++ span_lint_and_help(
++ cx,
++ PARTIAL_PUB_FIELDS,
++ field.vis.span,
++ msg,
++ None,
++ "consider using private field here",
++ );
++ return;
++ } else if all_pub && !field.vis.kind.is_pub() {
++ span_lint_and_help(
++ cx,
++ PARTIAL_PUB_FIELDS,
++ field.vis.span,
++ msg,
++ None,
++ "consider using public field here",
++ );
++ return;
++ }
++ }
++ }
++}
--- /dev/null
- use rustc_middle::ty::{self, Ty};
+//! Checks for usage of `&Vec[_]` and `&String`.
+
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then, span_lint_hir_and_then};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::expr_sig;
+use clippy_utils::visitors::contains_unsafe_block;
+use clippy_utils::{get_expr_use_or_unification_node, is_lint_allowed, path_def_id, path_to_local, paths};
+use if_chain::if_chain;
+use rustc_errors::{Applicability, MultiSpan};
+use rustc_hir::def_id::DefId;
+use rustc_hir::hir_id::HirIdMap;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{
+ self as hir, AnonConst, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnRetTy, FnSig, GenericArg,
+ ImplItemKind, ItemKind, Lifetime, LifetimeName, Mutability, Node, Param, ParamName, PatKind, QPath, TraitFn,
+ TraitItem, TraitItemKind, TyKind, Unsafety,
+};
++use rustc_infer::infer::TyCtxtInferExt;
++use rustc_infer::traits::{Obligation, ObligationCause};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::nested_filter;
- let args_idx = match path_to_local(e).and_then(|id| self.bindings.get(&id)) {
- Some(&i) => i,
- None => return walk_expr(self, e),
++use rustc_middle::ty::{self, Binder, ExistentialPredicate, List, PredicateKind, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+use rustc_span::symbol::Symbol;
++use rustc_trait_selection::infer::InferCtxtExt as _;
++use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt as _;
+use std::fmt;
+use std::iter;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for function arguments of type `&String`, `&Vec`,
+ /// `&PathBuf`, and `Cow<_>`. It will also suggest you replace `.clone()` calls
+ /// with the appropriate `.to_owned()`/`to_string()` calls.
+ ///
+ /// ### Why is this bad?
+ /// Requiring the argument to be of the specific size
+ /// makes the function less useful for no benefit; slices in the form of `&[T]`
+ /// or `&str` usually suffice and can be obtained from other types, too.
+ ///
+ /// ### Known problems
+ /// There may be `fn(&Vec)`-typed references pointing to your function.
+ /// If you have them, you will get a compiler error after applying this lint's
+ /// suggestions. You then have the choice to undo your changes or change the
+ /// type of the reference.
+ ///
+ /// Note that if the function is part of your public interface, there may be
+ /// other crates referencing it, of which you may not be aware. Carefully
+ /// deprecate the function before applying the lint suggestions in this case.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// fn foo(&Vec<u32>) { .. }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```ignore
+ /// fn foo(&[u32]) { .. }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub PTR_ARG,
+ style,
+ "fn arguments of the type `&Vec<...>` or `&String`, suggesting to use `&[...]` or `&str` instead, respectively"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for equality comparisons with `ptr::null`
+ ///
+ /// ### Why is this bad?
+ /// It's easier and more readable to use the inherent
+ /// `.is_null()`
+ /// method instead
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// use std::ptr;
+ ///
+ /// if x == ptr::null {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// if x.is_null() {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_NULL,
+ style,
+ "comparing a pointer to a null pointer, suggesting to use `.is_null()` instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for functions that take immutable references and return
+ /// mutable ones. This will not trigger if no unsafe code exists as there
+ /// are multiple safe functions which will do this transformation
+ ///
+ /// To be on the conservative side, if there's at least one mutable
+ /// reference with the output lifetime, this lint will not trigger.
+ ///
+ /// ### Why is this bad?
+ /// Creating a mutable reference which can be repeatably derived from an
+ /// immutable reference is unsound as it allows creating multiple live
+ /// mutable references to the same object.
+ ///
+ /// This [error](https://github.com/rust-lang/rust/issues/39465) actually
+ /// lead to an interim Rust release 1.15.1.
+ ///
+ /// ### Known problems
+ /// This pattern is used by memory allocators to allow allocating multiple
+ /// objects while returning mutable references to each one. So long as
+ /// different mutable references are returned each time such a function may
+ /// be safe.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// fn foo(&Foo) -> &mut Bar { .. }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MUT_FROM_REF,
+ correctness,
+ "fns that create mutable refs from immutable ref args"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for invalid usages of `ptr::null`.
+ ///
+ /// ### Why is this bad?
+ /// This causes undefined behavior.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // Undefined behavior
+ /// unsafe { std::slice::from_raw_parts(ptr::null(), 0); }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```ignore
+ /// unsafe { std::slice::from_raw_parts(NonNull::dangling().as_ptr(), 0); }
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub INVALID_NULL_PTR_USAGE,
+ correctness,
+ "invalid usage of a null pointer, suggesting `NonNull::dangling()` instead"
+}
+
+declare_lint_pass!(Ptr => [PTR_ARG, CMP_NULL, MUT_FROM_REF, INVALID_NULL_PTR_USAGE]);
+
+impl<'tcx> LateLintPass<'tcx> for Ptr {
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if let TraitItemKind::Fn(sig, trait_method) = &item.kind {
+ if matches!(trait_method, TraitFn::Provided(_)) {
+ // Handled by check body.
+ return;
+ }
+
+ check_mut_from_ref(cx, sig, None);
+ for arg in check_fn_args(
+ cx,
+ cx.tcx.fn_sig(item.def_id).skip_binder().inputs(),
+ sig.decl.inputs,
+ &[],
+ )
+ .filter(|arg| arg.mutability() == Mutability::Not)
+ {
+ span_lint_hir_and_then(cx, PTR_ARG, arg.emission_id, arg.span, &arg.build_msg(), |diag| {
+ diag.span_suggestion(
+ arg.span,
+ "change this to",
+ format!("{}{}", arg.ref_prefix, arg.deref_ty.display(cx)),
+ Applicability::Unspecified,
+ );
+ });
+ }
+ }
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
+ let hir = cx.tcx.hir();
+ let mut parents = hir.parent_iter(body.value.hir_id);
+ let (item_id, sig, is_trait_item) = match parents.next() {
+ Some((_, Node::Item(i))) => {
+ if let ItemKind::Fn(sig, ..) = &i.kind {
+ (i.def_id, sig, false)
+ } else {
+ return;
+ }
+ },
+ Some((_, Node::ImplItem(i))) => {
+ if !matches!(parents.next(),
+ Some((_, Node::Item(i))) if matches!(&i.kind, ItemKind::Impl(i) if i.of_trait.is_none())
+ ) {
+ return;
+ }
+ if let ImplItemKind::Fn(sig, _) = &i.kind {
+ (i.def_id, sig, false)
+ } else {
+ return;
+ }
+ },
+ Some((_, Node::TraitItem(i))) => {
+ if let TraitItemKind::Fn(sig, _) = &i.kind {
+ (i.def_id, sig, true)
+ } else {
+ return;
+ }
+ },
+ _ => return,
+ };
+
+ check_mut_from_ref(cx, sig, Some(body));
+ let decl = sig.decl;
+ let sig = cx.tcx.fn_sig(item_id).skip_binder();
+ let lint_args: Vec<_> = check_fn_args(cx, sig.inputs(), decl.inputs, body.params)
+ .filter(|arg| !is_trait_item || arg.mutability() == Mutability::Not)
+ .collect();
+ let results = check_ptr_arg_usage(cx, body, &lint_args);
+
+ for (result, args) in results.iter().zip(lint_args.iter()).filter(|(r, _)| !r.skip) {
+ span_lint_hir_and_then(cx, PTR_ARG, args.emission_id, args.span, &args.build_msg(), |diag| {
+ diag.multipart_suggestion(
+ "change this to",
+ iter::once((args.span, format!("{}{}", args.ref_prefix, args.deref_ty.display(cx))))
+ .chain(result.replacements.iter().map(|r| {
+ (
+ r.expr_span,
+ format!("{}{}", snippet_opt(cx, r.self_span).unwrap(), r.replacement),
+ )
+ }))
+ .collect(),
+ Applicability::Unspecified,
+ );
+ });
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Binary(ref op, l, r) = expr.kind {
+ if (op.node == BinOpKind::Eq || op.node == BinOpKind::Ne) && (is_null_path(cx, l) || is_null_path(cx, r)) {
+ span_lint(
+ cx,
+ CMP_NULL,
+ expr.span,
+ "comparing with null is better expressed by the `.is_null()` method",
+ );
+ }
+ } else {
+ check_invalid_ptr_usage(cx, expr);
+ }
+ }
+}
+
+fn check_invalid_ptr_usage<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // (fn_path, arg_indices) - `arg_indices` are the `arg` positions where null would cause U.B.
+ const INVALID_NULL_PTR_USAGE_TABLE: [(&[&str], &[usize]); 16] = [
+ (&paths::SLICE_FROM_RAW_PARTS, &[0]),
+ (&paths::SLICE_FROM_RAW_PARTS_MUT, &[0]),
+ (&paths::PTR_COPY, &[0, 1]),
+ (&paths::PTR_COPY_NONOVERLAPPING, &[0, 1]),
+ (&paths::PTR_READ, &[0]),
+ (&paths::PTR_READ_UNALIGNED, &[0]),
+ (&paths::PTR_READ_VOLATILE, &[0]),
+ (&paths::PTR_REPLACE, &[0]),
+ (&paths::PTR_SLICE_FROM_RAW_PARTS, &[0]),
+ (&paths::PTR_SLICE_FROM_RAW_PARTS_MUT, &[0]),
+ (&paths::PTR_SWAP, &[0, 1]),
+ (&paths::PTR_SWAP_NONOVERLAPPING, &[0, 1]),
+ (&paths::PTR_WRITE, &[0]),
+ (&paths::PTR_WRITE_UNALIGNED, &[0]),
+ (&paths::PTR_WRITE_VOLATILE, &[0]),
+ (&paths::PTR_WRITE_BYTES, &[0]),
+ ];
+
+ if_chain! {
+ if let ExprKind::Call(fun, args) = expr.kind;
+ if let ExprKind::Path(ref qpath) = fun.kind;
+ if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
+ let fun_def_path = cx.get_def_path(fun_def_id).into_iter().map(Symbol::to_ident_string).collect::<Vec<_>>();
+ if let Some(&(_, arg_indices)) = INVALID_NULL_PTR_USAGE_TABLE
+ .iter()
+ .find(|&&(fn_path, _)| fn_path == fun_def_path);
+ then {
+ for &arg_idx in arg_indices {
+ if let Some(arg) = args.get(arg_idx).filter(|arg| is_null_path(cx, arg)) {
+ span_lint_and_sugg(
+ cx,
+ INVALID_NULL_PTR_USAGE,
+ arg.span,
+ "pointer must be non-null",
+ "change this to",
+ "core::ptr::NonNull::dangling().as_ptr()".to_string(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+ }
+}
+
+#[derive(Default)]
+struct PtrArgResult {
+ skip: bool,
+ replacements: Vec<PtrArgReplacement>,
+}
+
+struct PtrArgReplacement {
+ expr_span: Span,
+ self_span: Span,
+ replacement: &'static str,
+}
+
+struct PtrArg<'tcx> {
+ idx: usize,
+ emission_id: hir::HirId,
+ span: Span,
+ ty_did: DefId,
+ ty_name: Symbol,
+ method_renames: &'static [(&'static str, &'static str)],
+ ref_prefix: RefPrefix,
+ deref_ty: DerefTy<'tcx>,
+}
+impl PtrArg<'_> {
+ fn build_msg(&self) -> String {
+ format!(
+ "writing `&{}{}` instead of `&{}{}` involves a new object where a slice will do",
+ self.ref_prefix.mutability.prefix_str(),
+ self.ty_name,
+ self.ref_prefix.mutability.prefix_str(),
+ self.deref_ty.argless_str(),
+ )
+ }
+
+ fn mutability(&self) -> Mutability {
+ self.ref_prefix.mutability
+ }
+}
+
+struct RefPrefix {
+ lt: LifetimeName,
+ mutability: Mutability,
+}
+impl fmt::Display for RefPrefix {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ use fmt::Write;
+ f.write_char('&')?;
+ match self.lt {
+ LifetimeName::Param(_, ParamName::Plain(name)) => {
+ name.fmt(f)?;
+ f.write_char(' ')?;
+ },
+ LifetimeName::Infer => f.write_str("'_ ")?,
+ LifetimeName::Static => f.write_str("'static ")?,
+ _ => (),
+ }
+ f.write_str(self.mutability.prefix_str())
+ }
+}
+
+struct DerefTyDisplay<'a, 'tcx>(&'a LateContext<'tcx>, &'a DerefTy<'tcx>);
+impl fmt::Display for DerefTyDisplay<'_, '_> {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ use std::fmt::Write;
+ match self.1 {
+ DerefTy::Str => f.write_str("str"),
+ DerefTy::Path => f.write_str("Path"),
+ DerefTy::Slice(hir_ty, ty) => {
+ f.write_char('[')?;
+ match hir_ty.and_then(|s| snippet_opt(self.0, s)) {
+ Some(s) => f.write_str(&s)?,
+ None => ty.fmt(f)?,
+ }
+ f.write_char(']')
+ },
+ }
+ }
+}
+
+enum DerefTy<'tcx> {
+ Str,
+ Path,
+ Slice(Option<Span>, Ty<'tcx>),
+}
+impl<'tcx> DerefTy<'tcx> {
++ fn ty(&self, cx: &LateContext<'tcx>) -> Ty<'tcx> {
++ match *self {
++ Self::Str => cx.tcx.types.str_,
++ Self::Path => cx.tcx.mk_adt(
++ cx.tcx.adt_def(cx.tcx.get_diagnostic_item(sym::Path).unwrap()),
++ List::empty(),
++ ),
++ Self::Slice(_, ty) => cx.tcx.mk_slice(ty),
++ }
++ }
++
+ fn argless_str(&self) -> &'static str {
+ match *self {
+ Self::Str => "str",
+ Self::Path => "Path",
+ Self::Slice(..) => "[_]",
+ }
+ }
+
+ fn display<'a>(&'a self, cx: &'a LateContext<'tcx>) -> DerefTyDisplay<'a, 'tcx> {
+ DerefTyDisplay(cx, self)
+ }
+}
+
+fn check_fn_args<'cx, 'tcx: 'cx>(
+ cx: &'cx LateContext<'tcx>,
+ tys: &'tcx [Ty<'tcx>],
+ hir_tys: &'tcx [hir::Ty<'tcx>],
+ params: &'tcx [Param<'tcx>],
+) -> impl Iterator<Item = PtrArg<'tcx>> + 'cx {
+ tys.iter()
+ .zip(hir_tys.iter())
+ .enumerate()
+ .filter_map(|(i, (ty, hir_ty))| {
+ if_chain! {
+ if let ty::Ref(_, ty, mutability) = *ty.kind();
+ if let ty::Adt(adt, substs) = *ty.kind();
+
+ if let TyKind::Rptr(lt, ref ty) = hir_ty.kind;
+ if let TyKind::Path(QPath::Resolved(None, path)) = ty.ty.kind;
+
+ // Check that the name as typed matches the actual name of the type.
+ // e.g. `fn foo(_: &Foo)` shouldn't trigger the lint when `Foo` is an alias for `Vec`
+ if let [.., name] = path.segments;
+ if cx.tcx.item_name(adt.did()) == name.ident.name;
+
+ then {
+ let emission_id = params.get(i).map_or(hir_ty.hir_id, |param| param.hir_id);
+ let (method_renames, deref_ty) = match cx.tcx.get_diagnostic_name(adt.did()) {
+ Some(sym::Vec) => (
+ [("clone", ".to_owned()")].as_slice(),
+ DerefTy::Slice(
+ name.args
+ .and_then(|args| args.args.first())
+ .and_then(|arg| if let GenericArg::Type(ty) = arg {
+ Some(ty.span)
+ } else {
+ None
+ }),
+ substs.type_at(0),
+ ),
+ ),
+ Some(sym::String) => (
+ [("clone", ".to_owned()"), ("as_str", "")].as_slice(),
+ DerefTy::Str,
+ ),
+ Some(sym::PathBuf) => (
+ [("clone", ".to_path_buf()"), ("as_path", "")].as_slice(),
+ DerefTy::Path,
+ ),
+ Some(sym::Cow) if mutability == Mutability::Not => {
+ let ty_name = name.args
+ .and_then(|args| {
+ args.args.iter().find_map(|a| match a {
+ GenericArg::Type(x) => Some(x),
+ _ => None,
+ })
+ })
+ .and_then(|arg| snippet_opt(cx, arg.span))
+ .unwrap_or_else(|| substs.type_at(1).to_string());
+ span_lint_hir_and_then(
+ cx,
+ PTR_ARG,
+ emission_id,
+ hir_ty.span,
+ "using a reference to `Cow` is not recommended",
+ |diag| {
+ diag.span_suggestion(
+ hir_ty.span,
+ "change this to",
+ format!("&{}{ty_name}", mutability.prefix_str()),
+ Applicability::Unspecified,
+ );
+ }
+ );
+ return None;
+ },
+ _ => return None,
+ };
+ return Some(PtrArg {
+ idx: i,
+ emission_id,
+ span: hir_ty.span,
+ ty_did: adt.did(),
+ ty_name: name.ident.name,
+ method_renames,
+ ref_prefix: RefPrefix {
+ lt: lt.name,
+ mutability,
+ },
+ deref_ty,
+ });
+ }
+ }
+ None
+ })
+}
+
+fn check_mut_from_ref<'tcx>(cx: &LateContext<'tcx>, sig: &FnSig<'_>, body: Option<&'tcx Body<'_>>) {
+ if let FnRetTy::Return(ty) = sig.decl.output
+ && let Some((out, Mutability::Mut, _)) = get_rptr_lm(ty)
+ {
+ let out_region = cx.tcx.named_region(out.hir_id);
+ let args: Option<Vec<_>> = sig
+ .decl
+ .inputs
+ .iter()
+ .filter_map(get_rptr_lm)
+ .filter(|&(lt, _, _)| cx.tcx.named_region(lt.hir_id) == out_region)
+ .map(|(_, mutability, span)| (mutability == Mutability::Not).then_some(span))
+ .collect();
+ if let Some(args) = args
+ && !args.is_empty()
+ && body.map_or(true, |body| {
+ sig.header.unsafety == Unsafety::Unsafe || contains_unsafe_block(cx, body.value)
+ })
+ {
+ span_lint_and_then(
+ cx,
+ MUT_FROM_REF,
+ ty.span,
+ "mutable borrow from immutable input(s)",
+ |diag| {
+ let ms = MultiSpan::from_spans(args);
+ diag.span_note(ms, "immutable borrow here");
+ },
+ );
+ }
+ }
+}
+
+#[expect(clippy::too_many_lines)]
+fn check_ptr_arg_usage<'tcx>(cx: &LateContext<'tcx>, body: &'tcx Body<'_>, args: &[PtrArg<'tcx>]) -> Vec<PtrArgResult> {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ /// Map from a local id to which argument it came from (index into `Self::args` and
+ /// `Self::results`)
+ bindings: HirIdMap<usize>,
+ /// The arguments being checked.
+ args: &'cx [PtrArg<'tcx>],
+ /// The results for each argument (len should match args.len)
+ results: Vec<PtrArgResult>,
+ /// The number of arguments which can't be linted. Used to return early.
+ skip_count: usize,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_anon_const(&mut self, _: &'tcx AnonConst) {}
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if self.skip_count == self.args.len() {
+ return;
+ }
+
+ // Check if this is local we care about
- let id = if let Some(x) = self.cx.typeck_results().type_dependent_def_id(e.hir_id) {
- x
- } else {
++ let Some(&args_idx) = path_to_local(e).and_then(|id| self.bindings.get(&id)) else {
++ return walk_expr(self, e);
+ };
+ let args = &self.args[args_idx];
+ let result = &mut self.results[args_idx];
+
+ // Helper function to handle early returns.
+ let mut set_skip_flag = || {
+ if !result.skip {
+ self.skip_count += 1;
+ }
+ result.skip = true;
+ };
+
+ match get_expr_use_or_unification_node(self.cx.tcx, e) {
+ Some((Node::Stmt(_), _)) => (),
+ Some((Node::Local(l), _)) => {
+ // Only trace simple bindings. e.g `let x = y;`
+ if let PatKind::Binding(BindingAnnotation::NONE, id, _, None) = l.pat.kind {
+ self.bindings.insert(id, args_idx);
+ } else {
+ set_skip_flag();
+ }
+ },
+ Some((Node::Expr(e), child_id)) => match e.kind {
+ ExprKind::Call(f, expr_args) => {
+ let i = expr_args.iter().position(|arg| arg.hir_id == child_id).unwrap_or(0);
+ if expr_sig(self.cx, f).and_then(|sig| sig.input(i)).map_or(true, |ty| {
+ match *ty.skip_binder().peel_refs().kind() {
++ ty::Dynamic(preds, _, _) => !matches_preds(self.cx, args.deref_ty.ty(self.cx), preds),
+ ty::Param(_) => true,
+ ty::Adt(def, _) => def.did() == args.ty_did,
+ _ => false,
+ }
+ }) {
+ // Passed to a function taking the non-dereferenced type.
+ set_skip_flag();
+ }
+ },
+ ExprKind::MethodCall(name, self_arg, expr_args, _) => {
+ let i = std::iter::once(self_arg)
+ .chain(expr_args.iter())
+ .position(|arg| arg.hir_id == child_id)
+ .unwrap_or(0);
+ if i == 0 {
+ // Check if the method can be renamed.
+ let name = name.ident.as_str();
+ if let Some((_, replacement)) = args.method_renames.iter().find(|&&(x, _)| x == name) {
+ result.replacements.push(PtrArgReplacement {
+ expr_span: e.span,
+ self_span: self_arg.span,
+ replacement,
+ });
+ return;
+ }
+ }
+
++ let Some(id) = self.cx.typeck_results().type_dependent_def_id(e.hir_id) else {
+ set_skip_flag();
+ return;
+ };
+
+ match *self.cx.tcx.fn_sig(id).skip_binder().inputs()[i].peel_refs().kind() {
++ ty::Dynamic(preds, _, _) if !matches_preds(self.cx, args.deref_ty.ty(self.cx), preds) => {
++ set_skip_flag();
++ },
+ ty::Param(_) => {
+ set_skip_flag();
+ },
+ // If the types match check for methods which exist on both types. e.g. `Vec::len` and
+ // `slice::len`
+ ty::Adt(def, _) if def.did() == args.ty_did => {
+ set_skip_flag();
+ },
+ _ => (),
+ }
+ },
+ // Indexing is fine for currently supported types.
+ ExprKind::Index(e, _) if e.hir_id == child_id => (),
+ _ => set_skip_flag(),
+ },
+ _ => set_skip_flag(),
+ }
+ }
+ }
+
+ let mut skip_count = 0;
+ let mut results = args.iter().map(|_| PtrArgResult::default()).collect::<Vec<_>>();
+ let mut v = V {
+ cx,
+ bindings: args
+ .iter()
+ .enumerate()
+ .filter_map(|(i, arg)| {
+ let param = &body.params[arg.idx];
+ match param.pat.kind {
+ PatKind::Binding(BindingAnnotation::NONE, id, _, None)
+ if !is_lint_allowed(cx, PTR_ARG, param.hir_id) =>
+ {
+ Some((id, i))
+ },
+ _ => {
+ skip_count += 1;
+ results[i].skip = true;
+ None
+ },
+ }
+ })
+ .collect(),
+ args,
+ results,
+ skip_count,
+ };
+ v.visit_expr(body.value);
+ v.results
+}
+
++fn matches_preds<'tcx>(
++ cx: &LateContext<'tcx>,
++ ty: Ty<'tcx>,
++ preds: &'tcx [Binder<'tcx, ExistentialPredicate<'tcx>>],
++) -> bool {
++ let infcx = cx.tcx.infer_ctxt().build();
++ preds.iter().all(|&p| match cx.tcx.erase_late_bound_regions(p) {
++ ExistentialPredicate::Trait(p) => infcx
++ .type_implements_trait(p.def_id, ty, p.substs, cx.param_env)
++ .must_apply_modulo_regions(),
++ ExistentialPredicate::Projection(p) => infcx.predicate_must_hold_modulo_regions(&Obligation::new(
++ ObligationCause::dummy(),
++ cx.param_env,
++ cx.tcx.mk_predicate(Binder::bind_with_vars(
++ PredicateKind::Projection(p.with_self_ty(cx.tcx, ty)),
++ List::empty(),
++ )),
++ )),
++ ExistentialPredicate::AutoTrait(p) => infcx
++ .type_implements_trait(p, ty, List::empty(), cx.param_env)
++ .must_apply_modulo_regions(),
++ })
++}
++
+fn get_rptr_lm<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
+ if let TyKind::Rptr(lt, ref m) = ty.kind {
+ Some((lt, m.mutbl, ty.span))
+ } else {
+ None
+ }
+}
+
+fn is_null_path(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ if let ExprKind::Call(pathexp, []) = expr.kind {
+ path_def_id(cx, pathexp).map_or(false, |id| {
+ matches!(cx.tcx.get_diagnostic_name(id), Some(sym::ptr_null | sym::ptr_null_mut))
+ })
+ } else {
+ false
+ }
+}
--- /dev/null
- let (receiver_expr, arg_expr, method) = match expr_as_ptr_offset_call(cx, expr) {
- Some(call_arg) => call_arg,
- None => return,
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
+use clippy_utils::source::snippet_opt;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+use std::fmt;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of the `offset` pointer method with a `usize` casted to an
+ /// `isize`.
+ ///
+ /// ### Why is this bad?
+ /// If we’re always increasing the pointer address, we can avoid the numeric
+ /// cast by using the `add` method instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec = vec![b'a', b'b', b'c'];
+ /// let ptr = vec.as_ptr();
+ /// let offset = 1_usize;
+ ///
+ /// unsafe {
+ /// ptr.offset(offset as isize);
+ /// }
+ /// ```
+ ///
+ /// Could be written:
+ ///
+ /// ```rust
+ /// let vec = vec![b'a', b'b', b'c'];
+ /// let ptr = vec.as_ptr();
+ /// let offset = 1_usize;
+ ///
+ /// unsafe {
+ /// ptr.add(offset);
+ /// }
+ /// ```
+ #[clippy::version = "1.30.0"]
+ pub PTR_OFFSET_WITH_CAST,
+ complexity,
+ "unneeded pointer offset cast"
+}
+
+declare_lint_pass!(PtrOffsetWithCast => [PTR_OFFSET_WITH_CAST]);
+
+impl<'tcx> LateLintPass<'tcx> for PtrOffsetWithCast {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Check if the expressions is a ptr.offset or ptr.wrapping_offset method call
- let cast_lhs_expr = match expr_as_cast_from_usize(cx, arg_expr) {
- Some(cast_lhs_expr) => cast_lhs_expr,
- None => return,
++ let Some((receiver_expr, arg_expr, method)) = expr_as_ptr_offset_call(cx, expr) else {
++ return
+ };
+
+ // Check if the argument to the method call is a cast from usize
++ let Some(cast_lhs_expr) = expr_as_cast_from_usize(cx, arg_expr) else {
++ return
+ };
+
+ let msg = format!("use of `{method}` with a `usize` casted to an `isize`");
+ if let Some(sugg) = build_suggestion(cx, method, receiver_expr, cast_lhs_expr) {
+ span_lint_and_sugg(
+ cx,
+ PTR_OFFSET_WITH_CAST,
+ expr.span,
+ &msg,
+ "try",
+ sugg,
+ Applicability::MachineApplicable,
+ );
+ } else {
+ span_lint(cx, PTR_OFFSET_WITH_CAST, expr.span, &msg);
+ }
+ }
+}
+
+// If the given expression is a cast from a usize, return the lhs of the cast
+fn expr_as_cast_from_usize<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
+ if let ExprKind::Cast(cast_lhs_expr, _) = expr.kind {
+ if is_expr_ty_usize(cx, cast_lhs_expr) {
+ return Some(cast_lhs_expr);
+ }
+ }
+ None
+}
+
+// If the given expression is a ptr::offset or ptr::wrapping_offset method call, return the
+// receiver, the arg of the method call, and the method.
+fn expr_as_ptr_offset_call<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>, Method)> {
+ if let ExprKind::MethodCall(path_segment, arg_0, [arg_1, ..], _) = &expr.kind {
+ if is_expr_ty_raw_ptr(cx, arg_0) {
+ if path_segment.ident.name == sym::offset {
+ return Some((arg_0, arg_1, Method::Offset));
+ }
+ if path_segment.ident.name == sym!(wrapping_offset) {
+ return Some((arg_0, arg_1, Method::WrappingOffset));
+ }
+ }
+ }
+ None
+}
+
+// Is the type of the expression a usize?
+fn is_expr_ty_usize<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> bool {
+ cx.typeck_results().expr_ty(expr) == cx.tcx.types.usize
+}
+
+// Is the type of the expression a raw pointer?
+fn is_expr_ty_raw_ptr<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> bool {
+ cx.typeck_results().expr_ty(expr).is_unsafe_ptr()
+}
+
+fn build_suggestion<'tcx>(
+ cx: &LateContext<'tcx>,
+ method: Method,
+ receiver_expr: &Expr<'_>,
+ cast_lhs_expr: &Expr<'_>,
+) -> Option<String> {
+ let receiver = snippet_opt(cx, receiver_expr.span)?;
+ let cast_lhs = snippet_opt(cx, cast_lhs_expr.span)?;
+ Some(format!("{receiver}.{}({cast_lhs})", method.suggestion()))
+}
+
+#[derive(Copy, Clone)]
+enum Method {
+ Offset,
+ WrappingOffset,
+}
+
+impl Method {
+ #[must_use]
+ fn suggestion(self) -> &'static str {
+ match self {
+ Self::Offset => "add",
+ Self::WrappingOffset => "wrapping_add",
+ }
+ }
+}
+
+impl fmt::Display for Method {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ Self::Offset => write!(f, "offset"),
+ Self::WrappingOffset => write!(f, "wrapping_offset"),
+ }
+ }
+}
--- /dev/null
- use rustc_data_structures::fx::FxHashMap;
+use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
++use clippy_utils::mir::{visit_local_usage, LocalUsage, PossibleBorrowerMap};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{has_drop, is_copy, is_type_diagnostic_item, walk_ptrs_ty_depth};
+use clippy_utils::{fn_has_unsatisfiable_preds, match_def_path, paths};
+use if_chain::if_chain;
- use rustc_index::bit_set::{BitSet, HybridBitSet};
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{def_id, Body, FnDecl, HirId};
- use rustc_middle::mir::{
- self, traversal,
- visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor as _},
- Mutability,
- };
- use rustc_middle::ty::{self, visit::TypeVisitor, Ty};
- use rustc_mir_dataflow::{Analysis, AnalysisDomain, CallReturnPlaces, GenKill, GenKillAnalysis, ResultsCursor};
+use rustc_lint::{LateContext, LateLintPass};
- use std::ops::ControlFlow;
++use rustc_middle::mir;
++use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::{BytePos, Span};
+use rustc_span::sym;
- let possible_origin = {
- let mut vis = PossibleOriginVisitor::new(mir);
- vis.visit_body(mir);
- vis.into_map(cx)
- };
- let maybe_storage_live_result = MaybeStorageLive
- .into_engine(cx.tcx, mir)
- .pass_name("redundant_clone")
- .iterate_to_fixpoint()
- .into_results_cursor(mir);
- let mut possible_borrower = {
- let mut vis = PossibleBorrowerVisitor::new(cx, mir, possible_origin);
- vis.visit_body(mir);
- vis.into_map(cx, maybe_storage_live_result)
- };
+
+macro_rules! unwrap_or_continue {
+ ($x:expr) => {
+ match $x {
+ Some(x) => x,
+ None => continue,
+ }
+ };
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for a redundant `clone()` (and its relatives) which clones an owned
+ /// value that is going to be dropped without further use.
+ ///
+ /// ### Why is this bad?
+ /// It is not always possible for the compiler to eliminate useless
+ /// allocations and deallocations generated by redundant `clone()`s.
+ ///
+ /// ### Known problems
+ /// False-negatives: analysis performed by this lint is conservative and limited.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::path::Path;
+ /// # #[derive(Clone)]
+ /// # struct Foo;
+ /// # impl Foo {
+ /// # fn new() -> Self { Foo {} }
+ /// # }
+ /// # fn call(x: Foo) {}
+ /// {
+ /// let x = Foo::new();
+ /// call(x.clone());
+ /// call(x.clone()); // this can just pass `x`
+ /// }
+ ///
+ /// ["lorem", "ipsum"].join(" ").to_string();
+ ///
+ /// Path::new("/a/b").join("c").to_path_buf();
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub REDUNDANT_CLONE,
+ perf,
+ "`clone()` of an owned value that is going to be dropped immediately"
+}
+
+declare_lint_pass!(RedundantClone => [REDUNDANT_CLONE]);
+
+impl<'tcx> LateLintPass<'tcx> for RedundantClone {
+ #[expect(clippy::too_many_lines)]
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ _: FnKind<'tcx>,
+ _: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ _: Span,
+ _: HirId,
+ ) {
+ let def_id = cx.tcx.hir().body_owner_def_id(body.id());
+
+ // Building MIR for `fn`s with unsatisfiable preds results in ICE.
+ if fn_has_unsatisfiable_preds(cx, def_id.to_def_id()) {
+ return;
+ }
+
+ let mir = cx.tcx.optimized_mir(def_id.to_def_id());
+
- fn visit_clone_usage(cloned: mir::Local, clone: mir::Local, mir: &mir::Body<'_>, bb: mir::BasicBlock) -> CloneUsage {
- struct V {
- cloned: mir::Local,
- clone: mir::Local,
- result: CloneUsage,
- }
- impl<'tcx> mir::visit::Visitor<'tcx> for V {
- fn visit_basic_block_data(&mut self, block: mir::BasicBlock, data: &mir::BasicBlockData<'tcx>) {
- let statements = &data.statements;
- for (statement_index, statement) in statements.iter().enumerate() {
- self.visit_statement(statement, mir::Location { block, statement_index });
- }
-
- self.visit_terminator(
- data.terminator(),
- mir::Location {
- block,
- statement_index: statements.len(),
- },
- );
- }
-
- fn visit_place(&mut self, place: &mir::Place<'tcx>, ctx: PlaceContext, loc: mir::Location) {
- let local = place.local;
-
- if local == self.cloned
- && !matches!(
- ctx,
- PlaceContext::MutatingUse(MutatingUseContext::Drop) | PlaceContext::NonUse(_)
- )
- {
- self.result.cloned_used = true;
- self.result.cloned_consume_or_mutate_loc = self.result.cloned_consume_or_mutate_loc.or_else(|| {
- matches!(
- ctx,
- PlaceContext::NonMutatingUse(NonMutatingUseContext::Move)
- | PlaceContext::MutatingUse(MutatingUseContext::Borrow)
- )
- .then(|| loc)
- });
- } else if local == self.clone {
- match ctx {
- PlaceContext::NonMutatingUse(NonMutatingUseContext::Move)
- | PlaceContext::MutatingUse(MutatingUseContext::Borrow) => {
- self.result.clone_consumed_or_mutated = true;
- },
- _ => {},
- }
- }
- }
- }
-
- let init = CloneUsage {
- cloned_used: false,
- cloned_consume_or_mutate_loc: None,
- // Consider non-temporary clones consumed.
- // TODO: Actually check for mutation of non-temporaries.
- clone_consumed_or_mutated: mir.local_kind(clone) != mir::LocalKind::Temp,
- };
- traversal::ReversePostorder::new(mir, bb)
- .skip(1)
- .fold(init, |usage, (tbb, tdata)| {
- // Short-circuit
- if (usage.cloned_used && usage.clone_consumed_or_mutated) ||
- // Give up on loops
- tdata.terminator().successors().any(|s| s == bb)
- {
- return CloneUsage {
- cloned_used: true,
- clone_consumed_or_mutated: true,
- ..usage
- };
- }
-
- let mut v = V {
- cloned,
- clone,
- result: usage,
- };
- v.visit_basic_block_data(tbb, tdata);
- v.result
- })
- }
-
- /// Determines liveness of each local purely based on `StorageLive`/`Dead`.
- #[derive(Copy, Clone)]
- struct MaybeStorageLive;
-
- impl<'tcx> AnalysisDomain<'tcx> for MaybeStorageLive {
- type Domain = BitSet<mir::Local>;
- const NAME: &'static str = "maybe_storage_live";
-
- fn bottom_value(&self, body: &mir::Body<'tcx>) -> Self::Domain {
- // bottom = dead
- BitSet::new_empty(body.local_decls.len())
- }
-
- fn initialize_start_block(&self, body: &mir::Body<'tcx>, state: &mut Self::Domain) {
- for arg in body.args_iter() {
- state.insert(arg);
- }
- }
- }
-
- impl<'tcx> GenKillAnalysis<'tcx> for MaybeStorageLive {
- type Idx = mir::Local;
-
- fn statement_effect(&self, trans: &mut impl GenKill<Self::Idx>, stmt: &mir::Statement<'tcx>, _: mir::Location) {
- match stmt.kind {
- mir::StatementKind::StorageLive(l) => trans.gen(l),
- mir::StatementKind::StorageDead(l) => trans.kill(l),
- _ => (),
- }
- }
-
- fn terminator_effect(
- &self,
- _trans: &mut impl GenKill<Self::Idx>,
- _terminator: &mir::Terminator<'tcx>,
- _loc: mir::Location,
- ) {
- }
-
- fn call_return_effect(
- &self,
- _trans: &mut impl GenKill<Self::Idx>,
- _block: mir::BasicBlock,
- _return_places: CallReturnPlaces<'_, 'tcx>,
- ) {
- // Nothing to do when a call returns successfully
- }
- }
-
- /// Collects the possible borrowers of each local.
- /// For example, `b = &a; c = &a;` will make `b` and (transitively) `c`
- /// possible borrowers of `a`.
- struct PossibleBorrowerVisitor<'a, 'tcx> {
- possible_borrower: TransitiveRelation,
- body: &'a mir::Body<'tcx>,
- cx: &'a LateContext<'tcx>,
- possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
- }
-
- impl<'a, 'tcx> PossibleBorrowerVisitor<'a, 'tcx> {
- fn new(
- cx: &'a LateContext<'tcx>,
- body: &'a mir::Body<'tcx>,
- possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
- ) -> Self {
- Self {
- possible_borrower: TransitiveRelation::default(),
- cx,
- body,
- possible_origin,
- }
- }
-
- fn into_map(
- self,
- cx: &LateContext<'tcx>,
- maybe_live: ResultsCursor<'tcx, 'tcx, MaybeStorageLive>,
- ) -> PossibleBorrowerMap<'a, 'tcx> {
- let mut map = FxHashMap::default();
- for row in (1..self.body.local_decls.len()).map(mir::Local::from_usize) {
- if is_copy(cx, self.body.local_decls[row].ty) {
- continue;
- }
-
- let mut borrowers = self.possible_borrower.reachable_from(row, self.body.local_decls.len());
- borrowers.remove(mir::Local::from_usize(0));
- if !borrowers.is_empty() {
- map.insert(row, borrowers);
- }
- }
-
- let bs = BitSet::new_empty(self.body.local_decls.len());
- PossibleBorrowerMap {
- map,
- maybe_live,
- bitset: (bs.clone(), bs),
- }
- }
- }
-
- impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'tcx> {
- fn visit_assign(&mut self, place: &mir::Place<'tcx>, rvalue: &mir::Rvalue<'_>, _location: mir::Location) {
- let lhs = place.local;
- match rvalue {
- mir::Rvalue::Ref(_, _, borrowed) => {
- self.possible_borrower.add(borrowed.local, lhs);
- },
- other => {
- if ContainsRegion
- .visit_ty(place.ty(&self.body.local_decls, self.cx.tcx).ty)
- .is_continue()
- {
- return;
- }
- rvalue_locals(other, |rhs| {
- if lhs != rhs {
- self.possible_borrower.add(rhs, lhs);
- }
- });
- },
- }
- }
-
- fn visit_terminator(&mut self, terminator: &mir::Terminator<'_>, _loc: mir::Location) {
- if let mir::TerminatorKind::Call {
- args,
- destination: mir::Place { local: dest, .. },
- ..
- } = &terminator.kind
- {
- // TODO add doc
- // If the call returns something with lifetimes,
- // let's conservatively assume the returned value contains lifetime of all the arguments.
- // For example, given `let y: Foo<'a> = foo(x)`, `y` is considered to be a possible borrower of `x`.
-
- let mut immutable_borrowers = vec![];
- let mut mutable_borrowers = vec![];
-
- for op in args {
- match op {
- mir::Operand::Copy(p) | mir::Operand::Move(p) => {
- if let ty::Ref(_, _, Mutability::Mut) = self.body.local_decls[p.local].ty.kind() {
- mutable_borrowers.push(p.local);
- } else {
- immutable_borrowers.push(p.local);
- }
- },
- mir::Operand::Constant(..) => (),
- }
- }
-
- let mut mutable_variables: Vec<mir::Local> = mutable_borrowers
- .iter()
- .filter_map(|r| self.possible_origin.get(r))
- .flat_map(HybridBitSet::iter)
- .collect();
-
- if ContainsRegion.visit_ty(self.body.local_decls[*dest].ty).is_break() {
- mutable_variables.push(*dest);
- }
-
- for y in mutable_variables {
- for x in &immutable_borrowers {
- self.possible_borrower.add(*x, y);
- }
- for x in &mutable_borrowers {
- self.possible_borrower.add(*x, y);
- }
- }
- }
- }
- }
-
- /// Collect possible borrowed for every `&mut` local.
- /// For example, `_1 = &mut _2` generate _1: {_2,...}
- /// Known Problems: not sure all borrowed are tracked
- struct PossibleOriginVisitor<'a, 'tcx> {
- possible_origin: TransitiveRelation,
- body: &'a mir::Body<'tcx>,
- }
-
- impl<'a, 'tcx> PossibleOriginVisitor<'a, 'tcx> {
- fn new(body: &'a mir::Body<'tcx>) -> Self {
- Self {
- possible_origin: TransitiveRelation::default(),
- body,
- }
- }
-
- fn into_map(self, cx: &LateContext<'tcx>) -> FxHashMap<mir::Local, HybridBitSet<mir::Local>> {
- let mut map = FxHashMap::default();
- for row in (1..self.body.local_decls.len()).map(mir::Local::from_usize) {
- if is_copy(cx, self.body.local_decls[row].ty) {
- continue;
- }
-
- let mut borrowers = self.possible_origin.reachable_from(row, self.body.local_decls.len());
- borrowers.remove(mir::Local::from_usize(0));
- if !borrowers.is_empty() {
- map.insert(row, borrowers);
- }
- }
- map
- }
- }
-
- impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleOriginVisitor<'a, 'tcx> {
- fn visit_assign(&mut self, place: &mir::Place<'tcx>, rvalue: &mir::Rvalue<'_>, _location: mir::Location) {
- let lhs = place.local;
- match rvalue {
- // Only consider `&mut`, which can modify origin place
- mir::Rvalue::Ref(_, rustc_middle::mir::BorrowKind::Mut { .. }, borrowed) |
- // _2: &mut _;
- // _3 = move _2
- mir::Rvalue::Use(mir::Operand::Move(borrowed)) |
- // _3 = move _2 as &mut _;
- mir::Rvalue::Cast(_, mir::Operand::Move(borrowed), _)
- => {
- self.possible_origin.add(lhs, borrowed.local);
- },
- _ => {},
- }
- }
- }
-
- struct ContainsRegion;
-
- impl TypeVisitor<'_> for ContainsRegion {
- type BreakTy = ();
-
- fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<Self::BreakTy> {
- ControlFlow::BREAK
- }
- }
-
- fn rvalue_locals(rvalue: &mir::Rvalue<'_>, mut visit: impl FnMut(mir::Local)) {
- use rustc_middle::mir::Rvalue::{Aggregate, BinaryOp, Cast, CheckedBinaryOp, Repeat, UnaryOp, Use};
-
- let mut visit_op = |op: &mir::Operand<'_>| match op {
- mir::Operand::Copy(p) | mir::Operand::Move(p) => visit(p.local),
- mir::Operand::Constant(..) => (),
- };
++ let mut possible_borrower = PossibleBorrowerMap::new(cx, mir);
+
+ for (bb, bbdata) in mir.basic_blocks.iter_enumerated() {
+ let terminator = bbdata.terminator();
+
+ if terminator.source_info.span.from_expansion() {
+ continue;
+ }
+
+ // Give up on loops
+ if terminator.successors().any(|s| s == bb) {
+ continue;
+ }
+
+ let (fn_def_id, arg, arg_ty, clone_ret) =
+ unwrap_or_continue!(is_call_with_ref_arg(cx, mir, &terminator.kind));
+
+ let from_borrow = match_def_path(cx, fn_def_id, &paths::CLONE_TRAIT_METHOD)
+ || match_def_path(cx, fn_def_id, &paths::TO_OWNED_METHOD)
+ || (match_def_path(cx, fn_def_id, &paths::TO_STRING_METHOD)
+ && is_type_diagnostic_item(cx, arg_ty, sym::String));
+
+ let from_deref = !from_borrow
+ && (match_def_path(cx, fn_def_id, &paths::PATH_TO_PATH_BUF)
+ || match_def_path(cx, fn_def_id, &paths::OS_STR_TO_OS_STRING));
+
+ if !from_borrow && !from_deref {
+ continue;
+ }
+
+ if let ty::Adt(def, _) = arg_ty.kind() {
+ if def.is_manually_drop() {
+ continue;
+ }
+ }
+
+ // `{ arg = &cloned; clone(move arg); }` or `{ arg = &cloned; to_path_buf(arg); }`
+ let (cloned, cannot_move_out) = unwrap_or_continue!(find_stmt_assigns_to(cx, mir, arg, from_borrow, bb));
+
+ let loc = mir::Location {
+ block: bb,
+ statement_index: bbdata.statements.len(),
+ };
+
+ // `Local` to be cloned, and a local of `clone` call's destination
+ let (local, ret_local) = if from_borrow {
+ // `res = clone(arg)` can be turned into `res = move arg;`
+ // if `arg` is the only borrow of `cloned` at this point.
+
+ if cannot_move_out || !possible_borrower.only_borrowers(&[arg], cloned, loc) {
+ continue;
+ }
+
+ (cloned, clone_ret)
+ } else {
+ // `arg` is a reference as it is `.deref()`ed in the previous block.
+ // Look into the predecessor block and find out the source of deref.
+
+ let ps = &mir.basic_blocks.predecessors()[bb];
+ if ps.len() != 1 {
+ continue;
+ }
+ let pred_terminator = mir[ps[0]].terminator();
+
+ // receiver of the `deref()` call
+ let (pred_arg, deref_clone_ret) = if_chain! {
+ if let Some((pred_fn_def_id, pred_arg, pred_arg_ty, res)) =
+ is_call_with_ref_arg(cx, mir, &pred_terminator.kind);
+ if res == cloned;
+ if cx.tcx.is_diagnostic_item(sym::deref_method, pred_fn_def_id);
+ if is_type_diagnostic_item(cx, pred_arg_ty, sym::PathBuf)
+ || is_type_diagnostic_item(cx, pred_arg_ty, sym::OsString);
+ then {
+ (pred_arg, res)
+ } else {
+ continue;
+ }
+ };
+
+ let (local, cannot_move_out) =
+ unwrap_or_continue!(find_stmt_assigns_to(cx, mir, pred_arg, true, ps[0]));
+ let loc = mir::Location {
+ block: bb,
+ statement_index: mir.basic_blocks[bb].statements.len(),
+ };
+
+ // This can be turned into `res = move local` if `arg` and `cloned` are not borrowed
+ // at the last statement:
+ //
+ // ```
+ // pred_arg = &local;
+ // cloned = deref(pred_arg);
+ // arg = &cloned;
+ // StorageDead(pred_arg);
+ // res = to_path_buf(cloned);
+ // ```
+ if cannot_move_out || !possible_borrower.only_borrowers(&[arg, cloned], local, loc) {
+ continue;
+ }
+
+ (local, deref_clone_ret)
+ };
+
+ let clone_usage = if local == ret_local {
+ CloneUsage {
+ cloned_used: false,
+ cloned_consume_or_mutate_loc: None,
+ clone_consumed_or_mutated: true,
+ }
+ } else {
+ let clone_usage = visit_clone_usage(local, ret_local, mir, bb);
+ if clone_usage.cloned_used && clone_usage.clone_consumed_or_mutated {
+ // cloned value is used, and the clone is modified or moved
+ continue;
+ } else if let Some(loc) = clone_usage.cloned_consume_or_mutate_loc {
+ // cloned value is mutated, and the clone is alive.
+ if possible_borrower.local_is_alive_at(ret_local, loc) {
+ continue;
+ }
+ }
+ clone_usage
+ };
+
+ let span = terminator.source_info.span;
+ let scope = terminator.source_info.scope;
+ let node = mir.source_scopes[scope]
+ .local_data
+ .as_ref()
+ .assert_crate_local()
+ .lint_root;
+
+ if_chain! {
+ if let Some(snip) = snippet_opt(cx, span);
+ if let Some(dot) = snip.rfind('.');
+ then {
+ let sugg_span = span.with_lo(
+ span.lo() + BytePos(u32::try_from(dot).unwrap())
+ );
+ let mut app = Applicability::MaybeIncorrect;
+
+ let call_snip = &snip[dot + 1..];
+ // Machine applicable when `call_snip` looks like `foobar()`
+ if let Some(call_snip) = call_snip.strip_suffix("()").map(str::trim) {
+ if call_snip.as_bytes().iter().all(|b| b.is_ascii_alphabetic() || *b == b'_') {
+ app = Applicability::MachineApplicable;
+ }
+ }
+
+ span_lint_hir_and_then(cx, REDUNDANT_CLONE, node, sugg_span, "redundant clone", |diag| {
+ diag.span_suggestion(
+ sugg_span,
+ "remove this",
+ "",
+ app,
+ );
+ if clone_usage.cloned_used {
+ diag.span_note(
+ span,
+ "cloned value is neither consumed nor mutated",
+ );
+ } else {
+ diag.span_note(
+ span.with_hi(span.lo() + BytePos(u32::try_from(dot).unwrap())),
+ "this value is dropped without further use",
+ );
+ }
+ });
+ } else {
+ span_lint_hir(cx, REDUNDANT_CLONE, node, span, "redundant clone");
+ }
+ }
+ }
+ }
+}
+
+/// If `kind` is `y = func(x: &T)` where `T: !Copy`, returns `(DefId of func, x, T, y)`.
+fn is_call_with_ref_arg<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &'tcx mir::Body<'tcx>,
+ kind: &'tcx mir::TerminatorKind<'tcx>,
+) -> Option<(def_id::DefId, mir::Local, Ty<'tcx>, mir::Local)> {
+ if_chain! {
+ if let mir::TerminatorKind::Call { func, args, destination, .. } = kind;
+ if args.len() == 1;
+ if let mir::Operand::Move(mir::Place { local, .. }) = &args[0];
+ if let ty::FnDef(def_id, _) = *func.ty(mir, cx.tcx).kind();
+ if let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].ty(mir, cx.tcx));
+ if !is_copy(cx, inner_ty);
+ then {
+ Some((def_id, *local, inner_ty, destination.as_local()?))
+ } else {
+ None
+ }
+ }
+}
+
+type CannotMoveOut = bool;
+
+/// Finds the first `to = (&)from`, and returns
+/// ``Some((from, whether `from` cannot be moved out))``.
+fn find_stmt_assigns_to<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &mir::Body<'tcx>,
+ to_local: mir::Local,
+ by_ref: bool,
+ bb: mir::BasicBlock,
+) -> Option<(mir::Local, CannotMoveOut)> {
+ let rvalue = mir.basic_blocks[bb].statements.iter().rev().find_map(|stmt| {
+ if let mir::StatementKind::Assign(box (mir::Place { local, .. }, v)) = &stmt.kind {
+ return if *local == to_local { Some(v) } else { None };
+ }
+
+ None
+ })?;
+
+ match (by_ref, rvalue) {
+ (true, mir::Rvalue::Ref(_, _, place)) | (false, mir::Rvalue::Use(mir::Operand::Copy(place))) => {
+ Some(base_local_and_movability(cx, mir, *place))
+ },
+ (false, mir::Rvalue::Ref(_, _, place)) => {
+ if let [mir::ProjectionElem::Deref] = place.as_ref().projection {
+ Some(base_local_and_movability(cx, mir, *place))
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Extracts and returns the undermost base `Local` of given `place`. Returns `place` itself
+/// if it is already a `Local`.
+///
+/// Also reports whether given `place` cannot be moved out.
+fn base_local_and_movability<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &mir::Body<'tcx>,
+ place: mir::Place<'tcx>,
+) -> (mir::Local, CannotMoveOut) {
+ use rustc_middle::mir::PlaceRef;
+
+ // Dereference. You cannot move things out from a borrowed value.
+ let mut deref = false;
+ // Accessing a field of an ADT that has `Drop`. Moving the field out will cause E0509.
+ let mut field = false;
+ // If projection is a slice index then clone can be removed only if the
+ // underlying type implements Copy
+ let mut slice = false;
+
+ let PlaceRef { local, mut projection } = place.as_ref();
+ while let [base @ .., elem] = projection {
+ projection = base;
+ deref |= matches!(elem, mir::ProjectionElem::Deref);
+ field |= matches!(elem, mir::ProjectionElem::Field(..))
+ && has_drop(cx, mir::Place::ty_from(local, projection, &mir.local_decls, cx.tcx).ty);
+ slice |= matches!(elem, mir::ProjectionElem::Index(..))
+ && !is_copy(cx, mir::Place::ty_from(local, projection, &mir.local_decls, cx.tcx).ty);
+ }
+
+ (local, deref || field || slice)
+}
+
+#[derive(Default)]
+struct CloneUsage {
+ /// Whether the cloned value is used after the clone.
+ cloned_used: bool,
+ /// The first location where the cloned value is consumed or mutated, if any.
+ cloned_consume_or_mutate_loc: Option<mir::Location>,
+ /// Whether the clone value is mutated.
+ clone_consumed_or_mutated: bool,
+}
- match rvalue {
- Use(op) | Repeat(op, _) | Cast(_, op, _) | UnaryOp(_, op) => visit_op(op),
- Aggregate(_, ops) => ops.iter().for_each(visit_op),
- BinaryOp(_, box (lhs, rhs)) | CheckedBinaryOp(_, box (lhs, rhs)) => {
- visit_op(lhs);
- visit_op(rhs);
+
- _ => (),
- }
- }
-
- /// Result of `PossibleBorrowerVisitor`.
- struct PossibleBorrowerMap<'a, 'tcx> {
- /// Mapping `Local -> its possible borrowers`
- map: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
- maybe_live: ResultsCursor<'a, 'tcx, MaybeStorageLive>,
- // Caches to avoid allocation of `BitSet` on every query
- bitset: (BitSet<mir::Local>, BitSet<mir::Local>),
- }
-
- impl PossibleBorrowerMap<'_, '_> {
- /// Returns true if the set of borrowers of `borrowed` living at `at` matches with `borrowers`.
- fn only_borrowers(&mut self, borrowers: &[mir::Local], borrowed: mir::Local, at: mir::Location) -> bool {
- self.maybe_live.seek_after_primary_effect(at);
-
- self.bitset.0.clear();
- let maybe_live = &mut self.maybe_live;
- if let Some(bitset) = self.map.get(&borrowed) {
- for b in bitset.iter().filter(move |b| maybe_live.contains(*b)) {
- self.bitset.0.insert(b);
- }
- } else {
- return false;
- }
-
- self.bitset.1.clear();
- for b in borrowers {
- self.bitset.1.insert(*b);
++fn visit_clone_usage(cloned: mir::Local, clone: mir::Local, mir: &mir::Body<'_>, bb: mir::BasicBlock) -> CloneUsage {
++ if let Some((
++ LocalUsage {
++ local_use_locs: cloned_use_locs,
++ local_consume_or_mutate_locs: cloned_consume_or_mutate_locs,
+ },
-
- self.bitset.0 == self.bitset.1
- }
-
- fn local_is_alive_at(&mut self, local: mir::Local, at: mir::Location) -> bool {
- self.maybe_live.seek_after_primary_effect(at);
- self.maybe_live.contains(local)
- }
- }
-
- #[derive(Default)]
- struct TransitiveRelation {
- relations: FxHashMap<mir::Local, Vec<mir::Local>>,
- }
- impl TransitiveRelation {
- fn add(&mut self, a: mir::Local, b: mir::Local) {
- self.relations.entry(a).or_default().push(b);
- }
-
- fn reachable_from(&self, a: mir::Local, domain_size: usize) -> HybridBitSet<mir::Local> {
- let mut seen = HybridBitSet::new_empty(domain_size);
- let mut stack = vec![a];
- while let Some(u) = stack.pop() {
- if let Some(edges) = self.relations.get(&u) {
- for &v in edges {
- if seen.insert(v) {
- stack.push(v);
- }
- }
- }
++ LocalUsage {
++ local_use_locs: _,
++ local_consume_or_mutate_locs: clone_consume_or_mutate_locs,
++ },
++ )) = visit_local_usage(
++ &[cloned, clone],
++ mir,
++ mir::Location {
++ block: bb,
++ statement_index: mir.basic_blocks[bb].statements.len(),
++ },
++ )
++ .map(|mut vec| (vec.remove(0), vec.remove(0)))
++ {
++ CloneUsage {
++ cloned_used: !cloned_use_locs.is_empty(),
++ cloned_consume_or_mutate_loc: cloned_consume_or_mutate_locs.first().copied(),
++ // Consider non-temporary clones consumed.
++ // TODO: Actually check for mutation of non-temporaries.
++ clone_consumed_or_mutated: mir.local_kind(clone) != mir::LocalKind::Temp
++ || !clone_consume_or_mutate_locs.is_empty(),
+ }
- seen
++ } else {
++ CloneUsage {
++ cloned_used: true,
++ cloned_consume_or_mutate_loc: None,
++ clone_consumed_or_mutated: true,
+ }
+ }
+}
--- /dev/null
- if let TyKind::Rptr(_, _) = inner_ty.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::last_path_segment;
+use clippy_utils::source::snippet;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{GenericArg, Mutability, Ty, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `&Option<&T>`.
+ ///
+ /// ### Why is this bad?
+ /// Since `&` is Copy, it's useless to have a
+ /// reference on `Option<&T>`.
+ ///
+ /// ### Known problems
+ /// It may be irrelevant to use this lint on
+ /// public API code as it will make a breaking change to apply it.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let x: &Option<&u32> = &Some(&0u32);
+ /// ```
+ /// Use instead:
+ /// ```rust,ignore
+ /// let x: Option<&u32> = Some(&0u32);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub REF_OPTION_REF,
+ pedantic,
+ "use `Option<&T>` instead of `&Option<&T>`"
+}
+
+declare_lint_pass!(RefOptionRef => [REF_OPTION_REF]);
+
+impl<'tcx> LateLintPass<'tcx> for RefOptionRef {
+ fn check_ty(&mut self, cx: &LateContext<'tcx>, ty: &'tcx Ty<'tcx>) {
+ if_chain! {
+ if let TyKind::Rptr(_, ref mut_ty) = ty.kind;
+ if mut_ty.mutbl == Mutability::Not;
+ if let TyKind::Path(ref qpath) = &mut_ty.ty.kind;
+ let last = last_path_segment(qpath);
+ if let Some(def_id) = last.res.opt_def_id();
+
+ if cx.tcx.is_diagnostic_item(sym::Option, def_id);
+ if let Some(params) = last_path_segment(qpath).args ;
+ if !params.parenthesized;
+ if let Some(inner_ty) = params.args.iter().find_map(|arg| match arg {
+ GenericArg::Type(inner_ty) => Some(inner_ty),
+ _ => None,
+ });
++ if let TyKind::Rptr(_, ref inner_mut_ty) = inner_ty.kind;
++ if inner_mut_ty.mutbl == Mutability::Not;
+
+ then {
+ span_lint_and_sugg(
+ cx,
+ REF_OPTION_REF,
+ ty.span,
+ "since `&` implements the `Copy` trait, `&Option<&T>` can be simplified to `Option<&T>`",
+ "try",
+ format!("Option<{}>", &snippet(cx, inner_ty.span, "..")),
+ Applicability::MaybeIncorrect,
+ );
+ }
+ }
+ }
+}
--- /dev/null
- let (id, ident) = match pat.kind {
- PatKind::Binding(_, hir_id, ident, _) => (hir_id, ident),
- _ => return,
- };
+use clippy_utils::diagnostics::span_lint_and_note;
+use clippy_utils::source::snippet;
+use clippy_utils::visitors::is_local_used;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::def::Res;
+use rustc_hir::def_id::LocalDefId;
+use rustc_hir::hir_id::ItemLocalId;
+use rustc_hir::{Block, Body, BodyOwnerKind, Expr, ExprKind, HirId, Let, Node, Pat, PatKind, QPath, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{Span, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bindings that shadow other bindings already in
+ /// scope, while just changing reference level or mutability.
+ ///
+ /// ### Why is this bad?
+ /// Not much, in fact it's a very common pattern in Rust
+ /// code. Still, some may opt to avoid it in their code base, they can set this
+ /// lint to `Warn`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// let x = &x;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 1;
+ /// let y = &x; // use different variable name
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHADOW_SAME,
+ restriction,
+ "rebinding a name to itself, e.g., `let mut x = &mut x`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bindings that shadow other bindings already in
+ /// scope, while reusing the original value.
+ ///
+ /// ### Why is this bad?
+ /// Not too much, in fact it's a common pattern in Rust
+ /// code. Still, some argue that name shadowing like this hurts readability,
+ /// because a value may be bound to different things depending on position in
+ /// the code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 2;
+ /// let x = x + 1;
+ /// ```
+ /// use different variable name:
+ /// ```rust
+ /// let x = 2;
+ /// let y = x + 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHADOW_REUSE,
+ restriction,
+ "rebinding a name to an expression that re-uses the original value, e.g., `let x = x + 1`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bindings that shadow other bindings already in
+ /// scope, either without an initialization or with one that does not even use
+ /// the original value.
+ ///
+ /// ### Why is this bad?
+ /// Name shadowing can hurt readability, especially in
+ /// large code bases, because it is easy to lose track of the active binding at
+ /// any place in the code. This can be alleviated by either giving more specific
+ /// names to bindings or introducing more scopes to contain the bindings.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let y = 1;
+ /// # let z = 2;
+ /// let x = y;
+ /// let x = z; // shadows the earlier binding
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let y = 1;
+ /// # let z = 2;
+ /// let x = y;
+ /// let w = z; // use different variable name
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHADOW_UNRELATED,
+ restriction,
+ "rebinding a name without even using the original value"
+}
+
+#[derive(Default)]
+pub(crate) struct Shadow {
+ bindings: Vec<(FxHashMap<Symbol, Vec<ItemLocalId>>, LocalDefId)>,
+}
+
+impl_lint_pass!(Shadow => [SHADOW_SAME, SHADOW_REUSE, SHADOW_UNRELATED]);
+
+impl<'tcx> LateLintPass<'tcx> for Shadow {
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
++ let PatKind::Binding(_, id, ident, _) = pat.kind else { return };
+
+ if pat.span.desugaring_kind().is_some() {
+ return;
+ }
+
+ if ident.span.from_expansion() || ident.span.is_dummy() {
+ return;
+ }
+
+ let HirId { owner, local_id } = id;
+ // get (or insert) the list of items for this owner and symbol
+ let (ref mut data, scope_owner) = *self.bindings.last_mut().unwrap();
+ let items_with_name = data.entry(ident.name).or_default();
+
+ // check other bindings with the same name, most recently seen first
+ for &prev in items_with_name.iter().rev() {
+ if prev == local_id {
+ // repeated binding in an `Or` pattern
+ return;
+ }
+
+ if is_shadow(cx, scope_owner, prev, local_id) {
+ let prev_hir_id = HirId { owner, local_id: prev };
+ lint_shadow(cx, pat, prev_hir_id, ident.span);
+ // only lint against the "nearest" shadowed binding
+ break;
+ }
+ }
+ // store the binding
+ items_with_name.push(local_id);
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'_>, body: &Body<'_>) {
+ let hir = cx.tcx.hir();
+ let owner_id = hir.body_owner_def_id(body.id());
+ if !matches!(hir.body_owner_kind(owner_id), BodyOwnerKind::Closure) {
+ self.bindings.push((FxHashMap::default(), owner_id));
+ }
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'_>, body: &Body<'_>) {
+ let hir = cx.tcx.hir();
+ if !matches!(
+ hir.body_owner_kind(hir.body_owner_def_id(body.id())),
+ BodyOwnerKind::Closure
+ ) {
+ self.bindings.pop();
+ }
+ }
+}
+
+fn is_shadow(cx: &LateContext<'_>, owner: LocalDefId, first: ItemLocalId, second: ItemLocalId) -> bool {
+ let scope_tree = cx.tcx.region_scope_tree(owner.to_def_id());
+ if let Some(first_scope) = scope_tree.var_scope(first) {
+ if let Some(second_scope) = scope_tree.var_scope(second) {
+ return scope_tree.is_subscope_of(second_scope, first_scope);
+ }
+ }
+
+ false
+}
+
+fn lint_shadow(cx: &LateContext<'_>, pat: &Pat<'_>, shadowed: HirId, span: Span) {
+ let (lint, msg) = match find_init(cx, pat.hir_id) {
+ Some(expr) if is_self_shadow(cx, pat, expr, shadowed) => {
+ let msg = format!(
+ "`{}` is shadowed by itself in `{}`",
+ snippet(cx, pat.span, "_"),
+ snippet(cx, expr.span, "..")
+ );
+ (SHADOW_SAME, msg)
+ },
+ Some(expr) if is_local_used(cx, expr, shadowed) => {
+ let msg = format!("`{}` is shadowed", snippet(cx, pat.span, "_"));
+ (SHADOW_REUSE, msg)
+ },
+ _ => {
+ let msg = format!("`{}` shadows a previous, unrelated binding", snippet(cx, pat.span, "_"));
+ (SHADOW_UNRELATED, msg)
+ },
+ };
+ span_lint_and_note(
+ cx,
+ lint,
+ span,
+ &msg,
+ Some(cx.tcx.hir().span(shadowed)),
+ "previous binding is here",
+ );
+}
+
+/// Returns true if the expression is a simple transformation of a local binding such as `&x`
+fn is_self_shadow(cx: &LateContext<'_>, pat: &Pat<'_>, mut expr: &Expr<'_>, hir_id: HirId) -> bool {
+ let hir = cx.tcx.hir();
+ let is_direct_binding = hir
+ .parent_iter(pat.hir_id)
+ .map_while(|(_id, node)| match node {
+ Node::Pat(pat) => Some(pat),
+ _ => None,
+ })
+ .all(|pat| matches!(pat.kind, PatKind::Ref(..) | PatKind::Or(_)));
+ if !is_direct_binding {
+ return false;
+ }
+ loop {
+ expr = match expr.kind {
+ ExprKind::Box(e)
+ | ExprKind::AddrOf(_, _, e)
+ | ExprKind::Block(
+ &Block {
+ stmts: [],
+ expr: Some(e),
+ ..
+ },
+ _,
+ )
+ | ExprKind::Unary(UnOp::Deref, e) => e,
+ ExprKind::Path(QPath::Resolved(None, path)) => break path.res == Res::Local(hir_id),
+ _ => break false,
+ }
+ }
+}
+
+/// Finds the "init" expression for a pattern: `let <pat> = <init>;` (or `if let`) or
+/// `match <init> { .., <pat> => .., .. }`
+fn find_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
+ for (_, node) in cx.tcx.hir().parent_iter(hir_id) {
+ let init = match node {
+ Node::Arm(_) | Node::Pat(_) => continue,
+ Node::Expr(expr) => match expr.kind {
+ ExprKind::Match(e, _, _) | ExprKind::Let(&Let { init: e, .. }) => Some(e),
+ _ => None,
+ },
+ Node::Local(local) => local.init,
+ _ => None,
+ };
+ return init;
+ }
+ None
+}
--- /dev/null
- pub(super) fn is_layout_incompatible<'tcx>(
- cx: &LateContext<'tcx>,
- from: Ty<'tcx>,
- to: Ty<'tcx>,
- ) -> bool {
+use rustc_hir::Expr;
+use rustc_hir_typeck::{cast, FnCtxt, Inherited};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{cast::CastKind, Ty};
+use rustc_span::DUMMY_SP;
+
+// check if the component types of the transmuted collection and the result have different ABI,
+// size or alignment
- use CastKind::{
- AddrPtrCast, ArrayPtrCast, FnPtrAddrCast, FnPtrPtrCast, PtrAddrCast, PtrPtrCast,
- };
++pub(super) fn is_layout_incompatible<'tcx>(cx: &LateContext<'tcx>, from: Ty<'tcx>, to: Ty<'tcx>) -> bool {
+ if let Ok(from) = cx.tcx.try_normalize_erasing_regions(cx.param_env, from)
+ && let Ok(to) = cx.tcx.try_normalize_erasing_regions(cx.param_env, to)
+ && let Ok(from_layout) = cx.tcx.layout_of(cx.param_env.and(from))
+ && let Ok(to_layout) = cx.tcx.layout_of(cx.param_env.and(to))
+ {
+ from_layout.size != to_layout.size || from_layout.align.abi != to_layout.align.abi
+ } else {
+ // no idea about layout, so don't lint
+ false
+ }
+}
+
+/// Check if the type conversion can be expressed as a pointer cast, instead of
+/// a transmute. In certain cases, including some invalid casts from array
+/// references to pointers, this may cause additional errors to be emitted and/or
+/// ICE error messages. This function will panic if that occurs.
+pub(super) fn can_be_expressed_as_pointer_cast<'tcx>(
+ cx: &LateContext<'tcx>,
+ e: &'tcx Expr<'_>,
+ from_ty: Ty<'tcx>,
+ to_ty: Ty<'tcx>,
+) -> bool {
- fn check_cast<'tcx>(
- cx: &LateContext<'tcx>,
- e: &'tcx Expr<'_>,
- from_ty: Ty<'tcx>,
- to_ty: Ty<'tcx>,
- ) -> Option<CastKind> {
++ use CastKind::{AddrPtrCast, ArrayPtrCast, FnPtrAddrCast, FnPtrPtrCast, PtrAddrCast, PtrPtrCast};
+ matches!(
+ check_cast(cx, e, from_ty, to_ty),
+ Some(PtrPtrCast | PtrAddrCast | AddrPtrCast | ArrayPtrCast | FnPtrPtrCast | FnPtrAddrCast)
+ )
+}
+
+/// If a cast from `from_ty` to `to_ty` is valid, returns an Ok containing the kind of
+/// the cast. In certain cases, including some invalid casts from array references
+/// to pointers, this may cause additional errors to be emitted and/or ICE error
+/// messages. This function will panic if that occurs.
- let fn_ctxt = FnCtxt::new(&inherited, cx.param_env, hir_id);
++fn check_cast<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, from_ty: Ty<'tcx>, to_ty: Ty<'tcx>) -> Option<CastKind> {
+ let hir_id = e.hir_id;
+ let local_def_id = hir_id.owner.def_id;
+
+ Inherited::build(cx.tcx, local_def_id).enter(|inherited| {
- assert!(!fn_ctxt.errors_reported_since_creation(), "Newly created FnCtxt contained errors");
++ let fn_ctxt = FnCtxt::new(inherited, cx.param_env, hir_id);
+
+ // If we already have errors, we can't be sure we can pointer cast.
++ assert!(
++ !fn_ctxt.errors_reported_since_creation(),
++ "Newly created FnCtxt contained errors"
++ );
+
+ if let Ok(check) = cast::CastCheck::new(
+ &fn_ctxt, e, from_ty, to_ty,
+ // We won't show any error to the user, so we don't care what the span is here.
+ DUMMY_SP, DUMMY_SP,
+ ) {
+ let res = check.do_check(&fn_ctxt);
+
+ // do_check's documentation says that it might return Ok and create
+ // errors in the fcx instead of returning Err in some cases. Those cases
+ // should be filtered out before getting here.
+ assert!(
+ !fn_ctxt.errors_reported_since_creation(),
+ "`fn_ctxt` contained errors after cast check!"
+ );
+
+ res.ok()
+ } else {
+ None
+ }
+ })
+}
--- /dev/null
- Applicability::MachineApplicable,
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{path_def_id, qpath_generic_tys};
+use rustc_errors::Applicability;
+use rustc_hir::{self as hir, def_id::DefId, QPath, TyKind};
+use rustc_lint::LateContext;
+use rustc_span::symbol::sym;
+
+use super::RC_BUFFER;
+
+pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_>, def_id: DefId) -> bool {
++ let app = Applicability::Unspecified;
+ if cx.tcx.is_diagnostic_item(sym::Rc, def_id) {
+ if let Some(alternate) = match_buffer_type(cx, qpath) {
+ span_lint_and_sugg(
+ cx,
+ RC_BUFFER,
+ hir_ty.span,
+ "usage of `Rc<T>` when T is a buffer type",
+ "try",
+ format!("Rc<{alternate}>"),
- let qpath = match &ty.kind {
- TyKind::Path(qpath) => qpath,
- _ => return false,
- };
++ app,
+ );
+ } else {
+ let Some(ty) = qpath_generic_tys(qpath).next() else { return false };
+ let Some(id) = path_def_id(cx, ty) else { return false };
+ if !cx.tcx.is_diagnostic_item(sym::Vec, id) {
+ return false;
+ }
- let mut applicability = Applicability::MachineApplicable;
++ let TyKind::Path(qpath) = &ty.kind else { return false };
+ let inner_span = match qpath_generic_tys(qpath).next() {
+ Some(ty) => ty.span,
+ None => return false,
+ };
- Applicability::MachineApplicable,
++ let mut applicability = app;
+ span_lint_and_sugg(
+ cx,
+ RC_BUFFER,
+ hir_ty.span,
+ "usage of `Rc<T>` when T is a buffer type",
+ "try",
+ format!(
+ "Rc<[{}]>",
+ snippet_with_applicability(cx, inner_span, "..", &mut applicability)
+ ),
- Applicability::MachineApplicable,
++ app,
+ );
+ return true;
+ }
+ } else if cx.tcx.is_diagnostic_item(sym::Arc, def_id) {
+ if let Some(alternate) = match_buffer_type(cx, qpath) {
+ span_lint_and_sugg(
+ cx,
+ RC_BUFFER,
+ hir_ty.span,
+ "usage of `Arc<T>` when T is a buffer type",
+ "try",
+ format!("Arc<{alternate}>"),
- let qpath = match &ty.kind {
- TyKind::Path(qpath) => qpath,
- _ => return false,
- };
++ app,
+ );
+ } else if let Some(ty) = qpath_generic_tys(qpath).next() {
+ let Some(id) = path_def_id(cx, ty) else { return false };
+ if !cx.tcx.is_diagnostic_item(sym::Vec, id) {
+ return false;
+ }
- let mut applicability = Applicability::MachineApplicable;
++ let TyKind::Path(qpath) = &ty.kind else { return false };
+ let inner_span = match qpath_generic_tys(qpath).next() {
+ Some(ty) => ty.span,
+ None => return false,
+ };
- Applicability::MachineApplicable,
++ let mut applicability = app;
+ span_lint_and_sugg(
+ cx,
+ RC_BUFFER,
+ hir_ty.span,
+ "usage of `Arc<T>` when T is a buffer type",
+ "try",
+ format!(
+ "Arc<[{}]>",
+ snippet_with_applicability(cx, inner_span, "..", &mut applicability)
+ ),
++ app,
+ );
+ return true;
+ }
+ }
+
+ false
+}
+
+fn match_buffer_type(cx: &LateContext<'_>, qpath: &QPath<'_>) -> Option<&'static str> {
+ let ty = qpath_generic_tys(qpath).next()?;
+ let id = path_def_id(cx, ty)?;
+ let path = match cx.tcx.get_diagnostic_name(id)? {
+ sym::String => "str",
+ sym::OsString => "std::ffi::OsStr",
+ sym::PathBuf => "std::path::Path",
+ _ => return None,
+ };
+ Some(path)
+}
--- /dev/null
- let mut applicability = Applicability::MaybeIncorrect;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::{path_def_id, qpath_generic_tys};
+use rustc_errors::Applicability;
+use rustc_hir::{self as hir, def_id::DefId, QPath, TyKind};
+use rustc_hir_analysis::hir_ty_to_ty;
+use rustc_lint::LateContext;
+use rustc_span::symbol::sym;
+
+use super::{utils, REDUNDANT_ALLOCATION};
+
+pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_>, def_id: DefId) -> bool {
++ let mut applicability = Applicability::MaybeIncorrect;
+ let outer_sym = if Some(def_id) == cx.tcx.lang_items().owned_box() {
+ "Box"
+ } else if cx.tcx.is_diagnostic_item(sym::Rc, def_id) {
+ "Rc"
+ } else if cx.tcx.is_diagnostic_item(sym::Arc, def_id) {
+ "Arc"
+ } else {
+ return false;
+ };
+
+ if let Some(span) = utils::match_borrows_parameter(cx, qpath) {
- let inner_qpath = match &ty.kind {
- TyKind::Path(inner_qpath) => inner_qpath,
- _ => return false,
+ let generic_snippet = snippet_with_applicability(cx, span, "..", &mut applicability);
+ span_lint_and_then(
+ cx,
+ REDUNDANT_ALLOCATION,
+ hir_ty.span,
+ &format!("usage of `{outer_sym}<{generic_snippet}>`"),
+ |diag| {
+ diag.span_suggestion(hir_ty.span, "try", format!("{generic_snippet}"), applicability);
+ diag.note(&format!(
+ "`{generic_snippet}` is already a pointer, `{outer_sym}<{generic_snippet}>` allocates a pointer on the heap"
+ ));
+ },
+ );
+ return true;
+ }
+
+ let Some(ty) = qpath_generic_tys(qpath).next() else { return false };
+ let Some(id) = path_def_id(cx, ty) else { return false };
+ let (inner_sym, ty) = match cx.tcx.get_diagnostic_name(id) {
+ Some(sym::Arc) => ("Arc", ty),
+ Some(sym::Rc) => ("Rc", ty),
+ _ if Some(id) == cx.tcx.lang_items().owned_box() => ("Box", ty),
+ _ => return false,
+ };
+
- let mut applicability = Applicability::MaybeIncorrect;
++ let TyKind::Path(inner_qpath) = &ty.kind else {
++ return false
+ };
+ let inner_span = match qpath_generic_tys(inner_qpath).next() {
+ Some(ty) => {
+ // Reallocation of a fat pointer causes it to become thin. `hir_ty_to_ty` is safe to use
+ // here because `mod.rs` guarantees this lint is only run on types outside of bodies and
+ // is not run on locals.
+ if !hir_ty_to_ty(cx.tcx, ty).is_sized(cx.tcx.at(ty.span), cx.param_env) {
+ return false;
+ }
+ ty.span
+ },
+ None => return false,
+ };
+ if inner_sym == outer_sym {
+ let generic_snippet = snippet_with_applicability(cx, inner_span, "..", &mut applicability);
+ span_lint_and_then(
+ cx,
+ REDUNDANT_ALLOCATION,
+ hir_ty.span,
+ &format!("usage of `{outer_sym}<{inner_sym}<{generic_snippet}>>`"),
+ |diag| {
+ diag.span_suggestion(
+ hir_ty.span,
+ "try",
+ format!("{outer_sym}<{generic_snippet}>"),
+ applicability,
+ );
+ diag.note(&format!(
+ "`{inner_sym}<{generic_snippet}>` is already on the heap, `{outer_sym}<{inner_sym}<{generic_snippet}>>` makes an extra allocation"
+ ));
+ },
+ );
+ } else {
+ let generic_snippet = snippet(cx, inner_span, "..");
+ span_lint_and_then(
+ cx,
+ REDUNDANT_ALLOCATION,
+ hir_ty.span,
+ &format!("usage of `{outer_sym}<{inner_sym}<{generic_snippet}>>`"),
+ |diag| {
+ diag.note(&format!(
+ "`{inner_sym}<{generic_snippet}>` is already on the heap, `{outer_sym}<{inner_sym}<{generic_snippet}>>` makes an extra allocation"
+ ));
+ diag.help(&format!(
+ "consider using just `{outer_sym}<{generic_snippet}>` or `{inner_sym}<{generic_snippet}>`"
+ ));
+ },
+ );
+ }
+ true
+}
--- /dev/null
- use clippy_utils::{get_trait_def_id, paths};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
- use rustc_span::{BytePos, Span};
+use if_chain::if_chain;
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Closure, Expr, ExprKind, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_middle::ty::{GenericPredicates, PredicateKind, ProjectionPredicate, TraitPredicate};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
- let ord_preds = get_trait_predicates_for_trait_id(cx, generics, get_trait_def_id(cx, &paths::ORD));
++use rustc_span::{sym, BytePos, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for functions that expect closures of type
+ /// Fn(...) -> Ord where the implemented closure returns the unit type.
+ /// The lint also suggests to remove the semi-colon at the end of the statement if present.
+ ///
+ /// ### Why is this bad?
+ /// Likely, returning the unit type is unintentional, and
+ /// could simply be caused by an extra semi-colon. Since () implements Ord
+ /// it doesn't cause a compilation error.
+ /// This is the same reasoning behind the unit_cmp lint.
+ ///
+ /// ### Known problems
+ /// If returning unit is intentional, then there is no
+ /// way of specifying this without triggering needless_return lint
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut twins = vec!((1, 1), (2, 2));
+ /// twins.sort_by_key(|x| { x.1; });
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub UNIT_RETURN_EXPECTING_ORD,
+ correctness,
+ "fn arguments of type Fn(...) -> Ord returning the unit type ()."
+}
+
+declare_lint_pass!(UnitReturnExpectingOrd => [UNIT_RETURN_EXPECTING_ORD]);
+
+fn get_trait_predicates_for_trait_id<'tcx>(
+ cx: &LateContext<'tcx>,
+ generics: GenericPredicates<'tcx>,
+ trait_id: Option<DefId>,
+) -> Vec<TraitPredicate<'tcx>> {
+ let mut preds = Vec::new();
+ for (pred, _) in generics.predicates {
+ if_chain! {
+ if let PredicateKind::Trait(poly_trait_pred) = pred.kind().skip_binder();
+ let trait_pred = cx.tcx.erase_late_bound_regions(pred.kind().rebind(poly_trait_pred));
+ if let Some(trait_def_id) = trait_id;
+ if trait_def_id == trait_pred.trait_ref.def_id;
+ then {
+ preds.push(trait_pred);
+ }
+ }
+ }
+ preds
+}
+
+fn get_projection_pred<'tcx>(
+ cx: &LateContext<'tcx>,
+ generics: GenericPredicates<'tcx>,
+ trait_pred: TraitPredicate<'tcx>,
+) -> Option<ProjectionPredicate<'tcx>> {
+ generics.predicates.iter().find_map(|(proj_pred, _)| {
+ if let ty::PredicateKind::Projection(pred) = proj_pred.kind().skip_binder() {
+ let projection_pred = cx.tcx.erase_late_bound_regions(proj_pred.kind().rebind(pred));
+ if projection_pred.projection_ty.substs == trait_pred.trait_ref.substs {
+ return Some(projection_pred);
+ }
+ }
+ None
+ })
+}
+
+fn get_args_to_check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Vec<(usize, String)> {
+ let mut args_to_check = Vec::new();
+ if let Some(def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id) {
+ let fn_sig = cx.tcx.fn_sig(def_id);
+ let generics = cx.tcx.predicates_of(def_id);
+ let fn_mut_preds = get_trait_predicates_for_trait_id(cx, generics, cx.tcx.lang_items().fn_mut_trait());
- if ord_preds.iter().any(|ord| Some(ord.self_ty()) == return_ty_pred.term.ty()) {
++ let ord_preds = get_trait_predicates_for_trait_id(cx, generics, cx.tcx.get_diagnostic_item(sym::Ord));
+ let partial_ord_preds =
+ get_trait_predicates_for_trait_id(cx, generics, cx.tcx.lang_items().partial_ord_trait());
+ // Trying to call erase_late_bound_regions on fn_sig.inputs() gives the following error
+ // The trait `rustc::ty::TypeFoldable<'_>` is not implemented for
+ // `&[rustc_middle::ty::Ty<'_>]`
+ let inputs_output = cx.tcx.erase_late_bound_regions(fn_sig.inputs_and_output());
+ inputs_output
+ .iter()
+ .rev()
+ .skip(1)
+ .rev()
+ .enumerate()
+ .for_each(|(i, inp)| {
+ for trait_pred in &fn_mut_preds {
+ if_chain! {
+ if trait_pred.self_ty() == inp;
+ if let Some(return_ty_pred) = get_projection_pred(cx, generics, *trait_pred);
+ then {
- } else if partial_ord_preds.iter().any(|pord| {
- pord.self_ty() == return_ty_pred.term.ty().unwrap()
- }) {
++ if ord_preds
++ .iter()
++ .any(|ord| Some(ord.self_ty()) == return_ty_pred.term.ty())
++ {
+ args_to_check.push((i, "Ord".to_string()));
++ } else if partial_ord_preds
++ .iter()
++ .any(|pord| pord.self_ty() == return_ty_pred.term.ty().unwrap())
++ {
+ args_to_check.push((i, "PartialOrd".to_string()));
+ }
+ }
+ }
+ }
+ });
+ }
+ args_to_check
+}
+
+fn check_arg<'tcx>(cx: &LateContext<'tcx>, arg: &'tcx Expr<'tcx>) -> Option<(Span, Option<Span>)> {
+ if_chain! {
+ if let ExprKind::Closure(&Closure { body, fn_decl_span, .. }) = arg.kind;
+ if let ty::Closure(_def_id, substs) = &cx.typeck_results().node_type(arg.hir_id).kind();
+ let ret_ty = substs.as_closure().sig().output();
+ let ty = cx.tcx.erase_late_bound_regions(ret_ty);
+ if ty.is_unit();
+ then {
+ let body = cx.tcx.hir().body(body);
+ if_chain! {
+ if let ExprKind::Block(block, _) = body.value.kind;
+ if block.expr.is_none();
+ if let Some(stmt) = block.stmts.last();
+ if let StmtKind::Semi(_) = stmt.kind;
+ then {
+ let data = stmt.span.data();
+ // Make a span out of the semicolon for the help message
+ Some((fn_decl_span, Some(data.with_lo(data.hi-BytePos(1)))))
+ } else {
+ Some((fn_decl_span, None))
+ }
+ }
+ } else {
+ None
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for UnitReturnExpectingOrd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if let ExprKind::MethodCall(_, receiver, args, _) = expr.kind {
+ let arg_indices = get_args_to_check(cx, expr);
+ let args = std::iter::once(receiver).chain(args.iter()).collect::<Vec<_>>();
+ for (i, trait_name) in arg_indices {
+ if i < args.len() {
+ match check_arg(cx, args[i]) {
+ Some((span, None)) => {
+ span_lint(
+ cx,
+ UNIT_RETURN_EXPECTING_ORD,
+ span,
+ &format!(
+ "this closure returns \
+ the unit type which also implements {trait_name}"
+ ),
+ );
+ },
+ Some((span, Some(last_semi))) => {
+ span_lint_and_help(
+ cx,
+ UNIT_RETURN_EXPECTING_ORD,
+ span,
+ &format!(
+ "this closure returns \
+ the unit type which also implements {trait_name}"
+ ),
+ Some(last_semi),
+ "probably caused by this trailing semicolon",
+ );
+ },
+ None => {},
+ }
+ }
+ }
+ }
+ }
+}
--- /dev/null
- let alternatives = match &mut p.kind {
- Or(ps) => ps,
- _ => return,
+#![allow(clippy::wildcard_imports, clippy::enum_glob_use)]
+
+use clippy_utils::ast_utils::{eq_field_pat, eq_id, eq_maybe_qself, eq_pat, eq_path};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::{meets_msrv, msrvs, over};
+use rustc_ast::mut_visit::*;
+use rustc_ast::ptr::P;
+use rustc_ast::{self as ast, Mutability, Pat, PatKind, PatKind::*, DUMMY_NODE_ID};
+use rustc_ast_pretty::pprust;
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::DUMMY_SP;
+
+use std::cell::Cell;
+use std::mem;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnested or-patterns, e.g., `Some(0) | Some(2)` and
+ /// suggests replacing the pattern with a nested one, `Some(0 | 2)`.
+ ///
+ /// Another way to think of this is that it rewrites patterns in
+ /// *disjunctive normal form (DNF)* into *conjunctive normal form (CNF)*.
+ ///
+ /// ### Why is this bad?
+ /// In the example above, `Some` is repeated, which unnecessarily complicates the pattern.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// if let Some(0) | Some(2) = Some(0) {}
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// if let Some(0 | 2) = Some(0) {}
+ /// }
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub UNNESTED_OR_PATTERNS,
+ pedantic,
+ "unnested or-patterns, e.g., `Foo(Bar) | Foo(Baz) instead of `Foo(Bar | Baz)`"
+}
+
+#[derive(Clone, Copy)]
+pub struct UnnestedOrPatterns {
+ msrv: Option<RustcVersion>,
+}
+
+impl UnnestedOrPatterns {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(UnnestedOrPatterns => [UNNESTED_OR_PATTERNS]);
+
+impl EarlyLintPass for UnnestedOrPatterns {
+ fn check_arm(&mut self, cx: &EarlyContext<'_>, a: &ast::Arm) {
+ if meets_msrv(self.msrv, msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &a.pat);
+ }
+ }
+
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) {
+ if meets_msrv(self.msrv, msrvs::OR_PATTERNS) {
+ if let ast::ExprKind::Let(pat, _, _) = &e.kind {
+ lint_unnested_or_patterns(cx, pat);
+ }
+ }
+ }
+
+ fn check_param(&mut self, cx: &EarlyContext<'_>, p: &ast::Param) {
+ if meets_msrv(self.msrv, msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &p.pat);
+ }
+ }
+
+ fn check_local(&mut self, cx: &EarlyContext<'_>, l: &ast::Local) {
+ if meets_msrv(self.msrv, msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &l.pat);
+ }
+ }
+
+ extract_msrv_attr!(EarlyContext);
+}
+
+fn lint_unnested_or_patterns(cx: &EarlyContext<'_>, pat: &Pat) {
+ if let Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) = pat.kind {
+ // This is a leaf pattern, so cloning is unprofitable.
+ return;
+ }
+
+ let mut pat = P(pat.clone());
+
+ // Nix all the paren patterns everywhere so that they aren't in our way.
+ remove_all_parens(&mut pat);
+
+ // Transform all unnested or-patterns into nested ones, and if there were none, quit.
+ if !unnest_or_patterns(&mut pat) {
+ return;
+ }
+
+ span_lint_and_then(cx, UNNESTED_OR_PATTERNS, pat.span, "unnested or-patterns", |db| {
+ insert_necessary_parens(&mut pat);
+ db.span_suggestion_verbose(
+ pat.span,
+ "nest the patterns",
+ pprust::pat_to_string(&pat),
+ Applicability::MachineApplicable,
+ );
+ });
+}
+
+/// Remove all `(p)` patterns in `pat`.
+fn remove_all_parens(pat: &mut P<Pat>) {
+ struct Visitor;
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, pat: &mut P<Pat>) {
+ noop_visit_pat(pat, self);
+ let inner = match &mut pat.kind {
+ Paren(i) => mem::replace(&mut i.kind, Wild),
+ _ => return,
+ };
+ pat.kind = inner;
+ }
+ }
+ Visitor.visit_pat(pat);
+}
+
+/// Insert parens where necessary according to Rust's precedence rules for patterns.
+fn insert_necessary_parens(pat: &mut P<Pat>) {
+ struct Visitor;
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, pat: &mut P<Pat>) {
+ use ast::BindingAnnotation;
+ noop_visit_pat(pat, self);
+ let target = match &mut pat.kind {
+ // `i @ a | b`, `box a | b`, and `& mut? a | b`.
+ Ident(.., Some(p)) | Box(p) | Ref(p, _) if matches!(&p.kind, Or(ps) if ps.len() > 1) => p,
+ Ref(p, Mutability::Not) if matches!(p.kind, Ident(BindingAnnotation::MUT, ..)) => p, // `&(mut x)`
+ _ => return,
+ };
+ target.kind = Paren(P(take_pat(target)));
+ }
+ }
+ Visitor.visit_pat(pat);
+}
+
+/// Unnest or-patterns `p0 | ... | p1` in the pattern `pat`.
+/// For example, this would transform `Some(0) | FOO | Some(2)` into `Some(0 | 2) | FOO`.
+fn unnest_or_patterns(pat: &mut P<Pat>) -> bool {
+ struct Visitor {
+ changed: bool,
+ }
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, p: &mut P<Pat>) {
+ // This is a bottom up transformation, so recurse first.
+ noop_visit_pat(p, self);
+
+ // Don't have an or-pattern? Just quit early on.
++ let Or(alternatives) = &mut p.kind else {
++ return
+ };
+
+ // Collapse or-patterns directly nested in or-patterns.
+ let mut idx = 0;
+ let mut this_level_changed = false;
+ while idx < alternatives.len() {
+ let inner = if let Or(ps) = &mut alternatives[idx].kind {
+ mem::take(ps)
+ } else {
+ idx += 1;
+ continue;
+ };
+ this_level_changed = true;
+ alternatives.splice(idx..=idx, inner);
+ }
+
+ // Focus on `p_n` and then try to transform all `p_i` where `i > n`.
+ let mut focus_idx = 0;
+ while focus_idx < alternatives.len() {
+ this_level_changed |= transform_with_focus_on_idx(alternatives, focus_idx);
+ focus_idx += 1;
+ }
+ self.changed |= this_level_changed;
+
+ // Deal with `Some(Some(0)) | Some(Some(1))`.
+ if this_level_changed {
+ noop_visit_pat(p, self);
+ }
+ }
+ }
+
+ let mut visitor = Visitor { changed: false };
+ visitor.visit_pat(pat);
+ visitor.changed
+}
+
+/// Match `$scrutinee` against `$pat` and extract `$then` from it.
+/// Panics if there is no match.
+macro_rules! always_pat {
+ ($scrutinee:expr, $pat:pat => $then:expr) => {
+ match $scrutinee {
+ $pat => $then,
+ _ => unreachable!(),
+ }
+ };
+}
+
+/// Focus on `focus_idx` in `alternatives`,
+/// attempting to extend it with elements of the same constructor `C`
+/// in `alternatives[focus_idx + 1..]`.
+fn transform_with_focus_on_idx(alternatives: &mut Vec<P<Pat>>, focus_idx: usize) -> bool {
+ // Extract the kind; we'll need to make some changes in it.
+ let mut focus_kind = mem::replace(&mut alternatives[focus_idx].kind, PatKind::Wild);
+ // We'll focus on `alternatives[focus_idx]`,
+ // so we're draining from `alternatives[focus_idx + 1..]`.
+ let start = focus_idx + 1;
+
+ // We're trying to find whatever kind (~"constructor") we found in `alternatives[start..]`.
+ let changed = match &mut focus_kind {
+ // These pattern forms are "leafs" and do not have sub-patterns.
+ // Therefore they are not some form of constructor `C`,
+ // with which a pattern `C(p_0)` may be formed,
+ // which we would want to join with other `C(p_j)`s.
+ Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_)
+ // Skip immutable refs, as grouping them saves few characters,
+ // and almost always requires adding parens (increasing noisiness).
+ // In the case of only two patterns, replacement adds net characters.
+ | Ref(_, Mutability::Not)
+ // Dealt with elsewhere.
+ | Or(_) | Paren(_) => false,
+ // Transform `box x | ... | box y` into `box (x | y)`.
+ //
+ // The cases below until `Slice(...)` deal with *singleton* products.
+ // These patterns have the shape `C(p)`, and not e.g., `C(p0, ..., pn)`.
+ Box(target) => extend_with_matching(
+ target, start, alternatives,
+ |k| matches!(k, Box(_)),
+ |k| always_pat!(k, Box(p) => p),
+ ),
+ // Transform `&mut x | ... | &mut y` into `&mut (x | y)`.
+ Ref(target, Mutability::Mut) => extend_with_matching(
+ target, start, alternatives,
+ |k| matches!(k, Ref(_, Mutability::Mut)),
+ |k| always_pat!(k, Ref(p, _) => p),
+ ),
+ // Transform `b @ p0 | ... b @ p1` into `b @ (p0 | p1)`.
+ Ident(b1, i1, Some(target)) => extend_with_matching(
+ target, start, alternatives,
+ // Binding names must match.
+ |k| matches!(k, Ident(b2, i2, Some(_)) if b1 == b2 && eq_id(*i1, *i2)),
+ |k| always_pat!(k, Ident(_, _, Some(p)) => p),
+ ),
+ // Transform `[pre, x, post] | ... | [pre, y, post]` into `[pre, x | y, post]`.
+ Slice(ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(k, Slice(ps2) if eq_pre_post(ps1, ps2, idx)),
+ |k| always_pat!(k, Slice(ps) => ps),
+ ),
+ // Transform `(pre, x, post) | ... | (pre, y, post)` into `(pre, x | y, post)`.
+ Tuple(ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(k, Tuple(ps2) if eq_pre_post(ps1, ps2, idx)),
+ |k| always_pat!(k, Tuple(ps) => ps),
+ ),
+ // Transform `S(pre, x, post) | ... | S(pre, y, post)` into `S(pre, x | y, post)`.
+ TupleStruct(qself1, path1, ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(
+ k,
+ TupleStruct(qself2, path2, ps2)
+ if eq_maybe_qself(qself1, qself2) && eq_path(path1, path2) && eq_pre_post(ps1, ps2, idx)
+ ),
+ |k| always_pat!(k, TupleStruct(_, _, ps) => ps),
+ ),
+ // Transform a record pattern `S { fp_0, ..., fp_n }`.
+ Struct(qself1, path1, fps1, rest1) => extend_with_struct_pat(qself1, path1, fps1, *rest1, start, alternatives),
+ };
+
+ alternatives[focus_idx].kind = focus_kind;
+ changed
+}
+
+/// Here we focusing on a record pattern `S { fp_0, ..., fp_n }`.
+/// In particular, for a record pattern, the order in which the field patterns is irrelevant.
+/// So when we fixate on some `ident_k: pat_k`, we try to find `ident_k` in the other pattern
+/// and check that all `fp_i` where `i ∈ ((0...n) \ k)` between two patterns are equal.
+fn extend_with_struct_pat(
+ qself1: &Option<ast::QSelf>,
+ path1: &ast::Path,
+ fps1: &mut [ast::PatField],
+ rest1: bool,
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+) -> bool {
+ (0..fps1.len()).any(|idx| {
+ let pos_in_2 = Cell::new(None); // The element `k`.
+ let tail_or = drain_matching(
+ start,
+ alternatives,
+ |k| {
+ matches!(k, Struct(qself2, path2, fps2, rest2)
+ if rest1 == *rest2 // If one struct pattern has `..` so must the other.
+ && eq_maybe_qself(qself1, qself2)
+ && eq_path(path1, path2)
+ && fps1.len() == fps2.len()
+ && fps1.iter().enumerate().all(|(idx_1, fp1)| {
+ if idx_1 == idx {
+ // In the case of `k`, we merely require identical field names
+ // so that we will transform into `ident_k: p1_k | p2_k`.
+ let pos = fps2.iter().position(|fp2| eq_id(fp1.ident, fp2.ident));
+ pos_in_2.set(pos);
+ pos.is_some()
+ } else {
+ fps2.iter().any(|fp2| eq_field_pat(fp1, fp2))
+ }
+ }))
+ },
+ // Extract `p2_k`.
+ |k| always_pat!(k, Struct(_, _, mut fps, _) => fps.swap_remove(pos_in_2.take().unwrap()).pat),
+ );
+ extend_with_tail_or(&mut fps1[idx].pat, tail_or)
+ })
+}
+
+/// Like `extend_with_matching` but for products with > 1 factor, e.g., `C(p_0, ..., p_n)`.
+/// Here, the idea is that we fixate on some `p_k` in `C`,
+/// allowing it to vary between two `targets` and `ps2` (returned by `extract`),
+/// while also requiring `ps1[..n] ~ ps2[..n]` (pre) and `ps1[n + 1..] ~ ps2[n + 1..]` (post),
+/// where `~` denotes semantic equality.
+fn extend_with_matching_product(
+ targets: &mut [P<Pat>],
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind, &[P<Pat>], usize) -> bool,
+ extract: impl Fn(PatKind) -> Vec<P<Pat>>,
+) -> bool {
+ (0..targets.len()).any(|idx| {
+ let tail_or = drain_matching(
+ start,
+ alternatives,
+ |k| predicate(k, targets, idx),
+ |k| extract(k).swap_remove(idx),
+ );
+ extend_with_tail_or(&mut targets[idx], tail_or)
+ })
+}
+
+/// Extract the pattern from the given one and replace it with `Wild`.
+/// This is meant for temporarily swapping out the pattern for manipulation.
+fn take_pat(from: &mut Pat) -> Pat {
+ let dummy = Pat {
+ id: DUMMY_NODE_ID,
+ kind: Wild,
+ span: DUMMY_SP,
+ tokens: None,
+ };
+ mem::replace(from, dummy)
+}
+
+/// Extend `target` as an or-pattern with the alternatives
+/// in `tail_or` if there are any and return if there were.
+fn extend_with_tail_or(target: &mut Pat, tail_or: Vec<P<Pat>>) -> bool {
+ fn extend(target: &mut Pat, mut tail_or: Vec<P<Pat>>) {
+ match target {
+ // On an existing or-pattern in the target, append to it.
+ Pat { kind: Or(ps), .. } => ps.append(&mut tail_or),
+ // Otherwise convert the target to an or-pattern.
+ target => {
+ let mut init_or = vec![P(take_pat(target))];
+ init_or.append(&mut tail_or);
+ target.kind = Or(init_or);
+ },
+ }
+ }
+
+ let changed = !tail_or.is_empty();
+ if changed {
+ // Extend the target.
+ extend(target, tail_or);
+ }
+ changed
+}
+
+// Extract all inner patterns in `alternatives` matching our `predicate`.
+// Only elements beginning with `start` are considered for extraction.
+fn drain_matching(
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind) -> bool,
+ extract: impl Fn(PatKind) -> P<Pat>,
+) -> Vec<P<Pat>> {
+ let mut tail_or = vec![];
+ let mut idx = 0;
+ for pat in alternatives.drain_filter(|p| {
+ // Check if we should extract, but only if `idx >= start`.
+ idx += 1;
+ idx > start && predicate(&p.kind)
+ }) {
+ tail_or.push(extract(pat.into_inner().kind));
+ }
+ tail_or
+}
+
+fn extend_with_matching(
+ target: &mut Pat,
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind) -> bool,
+ extract: impl Fn(PatKind) -> P<Pat>,
+) -> bool {
+ extend_with_tail_or(target, drain_matching(start, alternatives, predicate, extract))
+}
+
+/// Are the patterns in `ps1` and `ps2` equal save for `ps1[idx]` compared to `ps2[idx]`?
+fn eq_pre_post(ps1: &[P<Pat>], ps2: &[P<Pat>], idx: usize) -> bool {
+ ps1.len() == ps2.len()
+ && ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`.
+ && over(&ps1[..idx], &ps2[..idx], |l, r| eq_pat(l, r))
+ && over(&ps1[idx + 1..], &ps2[idx + 1..], |l, r| eq_pat(l, r))
+}
--- /dev/null
- let expr = match s.kind {
- hir::StmtKind::Semi(expr) | hir::StmtKind::Expr(expr) => expr,
- _ => return,
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::{is_trait_method, is_try, match_trait_method, paths};
+use rustc_hir as hir;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unused written/read amount.
+ ///
+ /// ### Why is this bad?
+ /// `io::Write::write(_vectored)` and
+ /// `io::Read::read(_vectored)` are not guaranteed to
+ /// process the entire buffer. They return how many bytes were processed, which
+ /// might be smaller
+ /// than a given buffer's length. If you don't need to deal with
+ /// partial-write/read, use
+ /// `write_all`/`read_exact` instead.
+ ///
+ /// When working with asynchronous code (either with the `futures`
+ /// crate or with `tokio`), a similar issue exists for
+ /// `AsyncWriteExt::write()` and `AsyncReadExt::read()` : these
+ /// functions are also not guaranteed to process the entire
+ /// buffer. Your code should either handle partial-writes/reads, or
+ /// call the `write_all`/`read_exact` methods on those traits instead.
+ ///
+ /// ### Known problems
+ /// Detects only common patterns.
+ ///
+ /// ### Examples
+ /// ```rust,ignore
+ /// use std::io;
+ /// fn foo<W: io::Write>(w: &mut W) -> io::Result<()> {
+ /// // must be `w.write_all(b"foo")?;`
+ /// w.write(b"foo")?;
+ /// Ok(())
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNUSED_IO_AMOUNT,
+ correctness,
+ "unused written/read amount"
+}
+
+declare_lint_pass!(UnusedIoAmount => [UNUSED_IO_AMOUNT]);
+
+impl<'tcx> LateLintPass<'tcx> for UnusedIoAmount {
+ fn check_stmt(&mut self, cx: &LateContext<'_>, s: &hir::Stmt<'_>) {
++ let (hir::StmtKind::Semi(expr) | hir::StmtKind::Expr(expr)) = s.kind else {
++ return
+ };
+
+ match expr.kind {
+ hir::ExprKind::Match(res, _, _) if is_try(cx, expr).is_some() => {
+ if let hir::ExprKind::Call(func, [ref arg_0, ..]) = res.kind {
+ if matches!(
+ func.kind,
+ hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::TryTraitBranch, ..))
+ ) {
+ check_map_error(cx, arg_0, expr);
+ }
+ } else {
+ check_map_error(cx, res, expr);
+ }
+ },
+ hir::ExprKind::MethodCall(path, arg_0, ..) => match path.ident.as_str() {
+ "expect" | "unwrap" | "unwrap_or" | "unwrap_or_else" => {
+ check_map_error(cx, arg_0, expr);
+ },
+ _ => (),
+ },
+ _ => (),
+ }
+ }
+}
+
+/// If `expr` is an (e).await, return the inner expression "e" that's being
+/// waited on. Otherwise return None.
+fn try_remove_await<'a>(expr: &'a hir::Expr<'a>) -> Option<&hir::Expr<'a>> {
+ if let hir::ExprKind::Match(expr, _, hir::MatchSource::AwaitDesugar) = expr.kind {
+ if let hir::ExprKind::Call(func, [ref arg_0, ..]) = expr.kind {
+ if matches!(
+ func.kind,
+ hir::ExprKind::Path(hir::QPath::LangItem(hir::LangItem::IntoFutureIntoFuture, ..))
+ ) {
+ return Some(arg_0);
+ }
+ }
+ }
+
+ None
+}
+
+fn check_map_error(cx: &LateContext<'_>, call: &hir::Expr<'_>, expr: &hir::Expr<'_>) {
+ let mut call = call;
+ while let hir::ExprKind::MethodCall(path, receiver, ..) = call.kind {
+ if matches!(path.ident.as_str(), "or" | "or_else" | "ok") {
+ call = receiver;
+ } else {
+ break;
+ }
+ }
+
+ if let Some(call) = try_remove_await(call) {
+ check_method_call(cx, call, expr, true);
+ } else {
+ check_method_call(cx, call, expr, false);
+ }
+}
+
+fn check_method_call(cx: &LateContext<'_>, call: &hir::Expr<'_>, expr: &hir::Expr<'_>, is_await: bool) {
+ if let hir::ExprKind::MethodCall(path, ..) = call.kind {
+ let symbol = path.ident.as_str();
+ let read_trait = if is_await {
+ match_trait_method(cx, call, &paths::FUTURES_IO_ASYNCREADEXT)
+ || match_trait_method(cx, call, &paths::TOKIO_IO_ASYNCREADEXT)
+ } else {
+ is_trait_method(cx, call, sym::IoRead)
+ };
+ let write_trait = if is_await {
+ match_trait_method(cx, call, &paths::FUTURES_IO_ASYNCWRITEEXT)
+ || match_trait_method(cx, call, &paths::TOKIO_IO_ASYNCWRITEEXT)
+ } else {
+ is_trait_method(cx, call, sym::IoWrite)
+ };
+
+ match (read_trait, write_trait, symbol, is_await) {
+ (true, _, "read", false) => span_lint_and_help(
+ cx,
+ UNUSED_IO_AMOUNT,
+ expr.span,
+ "read amount is not handled",
+ None,
+ "use `Read::read_exact` instead, or handle partial reads",
+ ),
+ (true, _, "read", true) => span_lint_and_help(
+ cx,
+ UNUSED_IO_AMOUNT,
+ expr.span,
+ "read amount is not handled",
+ None,
+ "use `AsyncReadExt::read_exact` instead, or handle partial reads",
+ ),
+ (true, _, "read_vectored", _) => {
+ span_lint(cx, UNUSED_IO_AMOUNT, expr.span, "read amount is not handled");
+ },
+ (_, true, "write", false) => span_lint_and_help(
+ cx,
+ UNUSED_IO_AMOUNT,
+ expr.span,
+ "written amount is not handled",
+ None,
+ "use `Write::write_all` instead, or handle partial writes",
+ ),
+ (_, true, "write", true) => span_lint_and_help(
+ cx,
+ UNUSED_IO_AMOUNT,
+ expr.span,
+ "written amount is not handled",
+ None,
+ "use `AsyncWriteExt::write_all` instead, or handle partial writes",
+ ),
+ (_, true, "write_vectored", _) => {
+ span_lint(cx, UNUSED_IO_AMOUNT, expr.span, "written amount is not handled");
+ },
+ _ => (),
+ }
+ }
+}
--- /dev/null
- let e = match arms[0].body.kind {
- ExprKind::Ret(Some(e)) | ExprKind::Break(_, Some(e)) => e,
- _ => return,
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg};
+use clippy_utils::source::{snippet, snippet_with_macro_callsite};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::{is_type_diagnostic_item, same_type_and_consts};
+use clippy_utils::{get_parent_expr, is_trait_method, match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, HirId, LangItem, MatchSource};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `Into`, `TryInto`, `From`, `TryFrom`, or `IntoIter` calls
+ /// which uselessly convert to the same type.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // format!() returns a `String`
+ /// let s: String = format!("hello").into();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let s: String = format!("hello");
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub USELESS_CONVERSION,
+ complexity,
+ "calls to `Into`, `TryInto`, `From`, `TryFrom`, or `IntoIter` which perform useless conversions to the same type"
+}
+
+#[derive(Default)]
+pub struct UselessConversion {
+ try_desugar_arm: Vec<HirId>,
+}
+
+impl_lint_pass!(UselessConversion => [USELESS_CONVERSION]);
+
+#[expect(clippy::too_many_lines)]
+impl<'tcx> LateLintPass<'tcx> for UselessConversion {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if e.span.from_expansion() {
+ return;
+ }
+
+ if Some(&e.hir_id) == self.try_desugar_arm.last() {
+ return;
+ }
+
+ match e.kind {
+ ExprKind::Match(_, arms, MatchSource::TryDesugar) => {
++ let (ExprKind::Ret(Some(e)) | ExprKind::Break(_, Some(e))) = arms[0].body.kind else {
++ return
+ };
+ if let ExprKind::Call(_, [arg, ..]) = e.kind {
+ self.try_desugar_arm.push(arg.hir_id);
+ }
+ },
+
+ ExprKind::MethodCall(name, recv, ..) => {
+ if is_trait_method(cx, e, sym::Into) && name.ident.as_str() == "into" {
+ let a = cx.typeck_results().expr_ty(e);
+ let b = cx.typeck_results().expr_ty(recv);
+ if same_type_and_consts(a, b) {
+ let sugg = snippet_with_macro_callsite(cx, recv.span, "<expr>").to_string();
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{b}`"),
+ "consider removing `.into()`",
+ sugg,
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ if is_trait_method(cx, e, sym::IntoIterator) && name.ident.name == sym::into_iter {
+ if let Some(parent_expr) = get_parent_expr(cx, e) {
+ if let ExprKind::MethodCall(parent_name, ..) = parent_expr.kind {
+ if parent_name.ident.name != sym::into_iter {
+ return;
+ }
+ }
+ }
+ let a = cx.typeck_results().expr_ty(e);
+ let b = cx.typeck_results().expr_ty(recv);
+ if same_type_and_consts(a, b) {
+ let sugg = snippet(cx, recv.span, "<expr>").into_owned();
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{b}`"),
+ "consider removing `.into_iter()`",
+ sugg,
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ if_chain! {
+ if is_trait_method(cx, e, sym::TryInto) && name.ident.name == sym::try_into;
+ let a = cx.typeck_results().expr_ty(e);
+ let b = cx.typeck_results().expr_ty(recv);
+ if is_type_diagnostic_item(cx, a, sym::Result);
+ if let ty::Adt(_, substs) = a.kind();
+ if let Some(a_type) = substs.types().next();
+ if same_type_and_consts(a_type, b);
+
+ then {
+ span_lint_and_help(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{b}`"),
+ None,
+ "consider removing `.try_into()`",
+ );
+ }
+ }
+ },
+
+ ExprKind::Call(path, [arg]) => {
+ if_chain! {
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id();
+ then {
+ let a = cx.typeck_results().expr_ty(e);
+ let b = cx.typeck_results().expr_ty(arg);
+ if_chain! {
+ if match_def_path(cx, def_id, &paths::TRY_FROM);
+ if is_type_diagnostic_item(cx, a, sym::Result);
+ if let ty::Adt(_, substs) = a.kind();
+ if let Some(a_type) = substs.types().next();
+ if same_type_and_consts(a_type, b);
+
+ then {
+ let hint = format!("consider removing `{}()`", snippet(cx, path.span, "TryFrom::try_from"));
+ span_lint_and_help(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{b}`"),
+ None,
+ &hint,
+ );
+ }
+ }
+
+ if_chain! {
+ if cx.tcx.lang_items().require(LangItem::FromFrom).ok() == Some(def_id);
+ if same_type_and_consts(a, b);
+
+ then {
+ let sugg = Sugg::hir_with_macro_callsite(cx, arg, "<expr>").maybe_par();
+ let sugg_msg =
+ format!("consider removing `{}()`", snippet(cx, path.span, "From::from"));
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{b}`"),
+ &sugg_msg,
+ sugg.to_string(),
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ }
+ }
+ },
+
+ _ => {},
+ }
+ }
+
+ fn check_expr_post(&mut self, _: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if Some(&e.hir_id) == self.try_desugar_arm.last() {
+ self.try_desugar_arm.pop();
+ }
+ }
+}
--- /dev/null
- /// if_chain! {
- /// if let ExprKind::If(ref cond, ref then, None) = item.kind,
- /// if let ExprKind::Binary(BinOp::Eq, ref left, ref right) = cond.kind,
- /// if let ExprKind::Path(ref path) = left.kind,
- /// if let ExprKind::Lit(ref lit) = right.kind,
- /// if let LitKind::Int(42, _) = lit.node,
- /// then {
- /// // report your lint here
- /// }
+//! A group of attributes that can be attached to Rust code in order
+//! to generate a clippy lint detecting said code automatically.
+
+use clippy_utils::{get_attr, higher};
+use rustc_ast::ast::{LitFloatType, LitKind};
+use rustc_ast::LitIntType;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir as hir;
+use rustc_hir::{
+ ArrayLen, BindingAnnotation, Closure, ExprKind, FnRetTy, HirId, Lit, PatKind, QPath, StmtKind, TyKind,
+};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::{Ident, Symbol};
++use std::cell::Cell;
+use std::fmt::{Display, Formatter, Write as _};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Generates clippy code that detects the offending pattern
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // ./tests/ui/my_lint.rs
+ /// fn foo() {
+ /// // detect the following pattern
+ /// #[clippy::author]
+ /// if x == 42 {
+ /// // but ignore everything from here on
+ /// #![clippy::author = "ignore"]
+ /// }
+ /// ()
+ /// }
+ /// ```
+ ///
+ /// Running `TESTNAME=ui/my_lint cargo uitest` will produce
+ /// a `./tests/ui/new_lint.stdout` file with the generated code:
+ ///
+ /// ```rust,ignore
+ /// // ./tests/ui/new_lint.stdout
- fn prelude() {
- println!("if_chain! {{");
- }
-
- fn done() {
- println!(" then {{");
- println!(" // report your lint here");
- println!(" }}");
- println!("}}");
++ /// if ExprKind::If(ref cond, ref then, None) = item.kind
++ /// && let ExprKind::Binary(BinOp::Eq, ref left, ref right) = cond.kind
++ /// && let ExprKind::Path(ref path) = left.kind
++ /// && let ExprKind::Lit(ref lit) = right.kind
++ /// && let LitKind::Int(42, _) = lit.node
++ /// {
++ /// // report your lint here
+ /// }
+ /// ```
+ pub LINT_AUTHOR,
+ internal_warn,
+ "helper for writing lints"
+}
+
+declare_lint_pass!(Author => [LINT_AUTHOR]);
+
+/// Writes a line of output with indentation added
+macro_rules! out {
+ ($($t:tt)*) => {
+ println!(" {}", format_args!($($t)*))
+ };
+}
+
+/// The variables passed in are replaced with `&Binding`s where the `value` field is set
+/// to the original value of the variable. The `name` field is set to the name of the variable
+/// (using `stringify!`) and is adjusted to avoid duplicate names.
+/// Note that the `Binding` may be printed directly to output the `name`.
+macro_rules! bind {
+ ($self:ident $(, $name:ident)+) => {
+ $(let $name = & $self.bind(stringify!($name), $name);)+
+ };
+}
+
+/// Transforms the given `Option<T>` variables into `OptionPat<Binding<T>>`.
+/// This displays as `Some($name)` or `None` when printed. The name of the inner binding
+/// is set to the name of the variable passed to the macro.
+macro_rules! opt_bind {
+ ($self:ident $(, $name:ident)+) => {
+ $(let $name = OptionPat::new($name.map(|o| $self.bind(stringify!($name), o)));)+
+ };
+}
+
+/// Creates a `Binding` that accesses the field of an existing `Binding`
+macro_rules! field {
+ ($binding:ident.$field:ident) => {
+ &Binding {
+ name: $binding.name.to_string() + stringify!(.$field),
+ value: $binding.value.$field,
+ }
+ };
+}
+
- prelude();
++/// Print a condition of a let chain, `chain!(self, "let Some(x) = y")` will print
++/// `if let Some(x) = y` on the first call and ` && let Some(x) = y` thereafter
++macro_rules! chain {
++ ($self:ident, $($t:tt)*) => {
++ if $self.first.take() {
++ println!("if {}", format_args!($($t)*));
++ } else {
++ println!(" && {}", format_args!($($t)*));
++ }
++ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for Author {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'_>) {
+ check_item(cx, item.hir_id());
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::ImplItem<'_>) {
+ check_item(cx, item.hir_id());
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::TraitItem<'_>) {
+ check_item(cx, item.hir_id());
+ }
+
+ fn check_arm(&mut self, cx: &LateContext<'tcx>, arm: &'tcx hir::Arm<'_>) {
+ check_node(cx, arm.hir_id, |v| {
+ v.arm(&v.bind("arm", arm));
+ });
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ check_node(cx, expr.hir_id, |v| {
+ v.expr(&v.bind("expr", expr));
+ });
+ }
+
+ fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx hir::Stmt<'_>) {
+ match stmt.kind {
+ StmtKind::Expr(e) | StmtKind::Semi(e) if has_attr(cx, e.hir_id) => return,
+ _ => {},
+ }
+ check_node(cx, stmt.hir_id, |v| {
+ v.stmt(&v.bind("stmt", stmt));
+ });
+ }
+}
+
+fn check_item(cx: &LateContext<'_>, hir_id: HirId) {
+ let hir = cx.tcx.hir();
+ if let Some(body_id) = hir.maybe_body_owned_by(hir_id.expect_owner().def_id) {
+ check_node(cx, hir_id, |v| {
+ v.expr(&v.bind("expr", hir.body(body_id).value));
+ });
+ }
+}
+
+fn check_node(cx: &LateContext<'_>, hir_id: HirId, f: impl Fn(&PrintVisitor<'_, '_>)) {
+ if has_attr(cx, hir_id) {
- done();
+ f(&PrintVisitor::new(cx));
- ids: std::cell::Cell<FxHashMap<&'static str, u32>>,
++ println!("{{");
++ println!(" // report your lint here");
++ println!("}}");
+ }
+}
+
+struct Binding<T> {
+ name: String,
+ value: T,
+}
+
+impl<T> Display for Binding<T> {
+ fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+ f.write_str(&self.name)
+ }
+}
+
+struct OptionPat<T> {
+ pub opt: Option<T>,
+}
+
+impl<T> OptionPat<T> {
+ fn new(opt: Option<T>) -> Self {
+ Self { opt }
+ }
+
+ fn if_some(&self, f: impl Fn(&T)) {
+ if let Some(t) = &self.opt {
+ f(t);
+ }
+ }
+}
+
+impl<T: Display> Display for OptionPat<T> {
+ fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+ match &self.opt {
+ None => f.write_str("None"),
+ Some(node) => write!(f, "Some({node})"),
+ }
+ }
+}
+
+struct PrintVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ /// Fields are the current index that needs to be appended to pattern
+ /// binding names
- ids: std::cell::Cell::default(),
++ ids: Cell<FxHashMap<&'static str, u32>>,
++ /// Currently at the first condition in the if chain
++ first: Cell<bool>,
+}
+
+#[allow(clippy::unused_self)]
+impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
+ fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
- None => out!("if {option}.is_none();"),
++ ids: Cell::default(),
++ first: Cell::new(true),
+ }
+ }
+
+ fn next(&self, s: &'static str) -> String {
+ let mut ids = self.ids.take();
+ let out = match *ids.entry(s).and_modify(|n| *n += 1).or_default() {
+ // first usage of the name, use it as is
+ 0 => s.to_string(),
+ // append a number starting with 1
+ n => format!("{s}{n}"),
+ };
+ self.ids.set(ids);
+ out
+ }
+
+ fn bind<T>(&self, name: &'static str, value: T) -> Binding<T> {
+ let name = self.next(name);
+ Binding { name, value }
+ }
+
+ fn option<T: Copy>(&self, option: &Binding<Option<T>>, name: &'static str, f: impl Fn(&Binding<T>)) {
+ match option.value {
- out!("if let Some({value}) = {option};");
++ None => chain!(self, "{option}.is_none()"),
+ Some(value) => {
+ let value = &self.bind(name, value);
- out!("if {slice}.is_empty();");
++ chain!(self, "let Some({value}) = {option}");
+ f(value);
+ },
+ }
+ }
+
+ fn slice<T>(&self, slice: &Binding<&[T]>, f: impl Fn(&Binding<&T>)) {
+ if slice.value.is_empty() {
- out!("if {slice}.len() == {};", slice.value.len());
++ chain!(self, "{slice}.is_empty()");
+ } else {
- out!("if {ident}.as_str() == {:?};", ident.value.as_str());
++ chain!(self, "{slice}.len() == {}", slice.value.len());
+ for (i, value) in slice.value.iter().enumerate() {
+ let name = format!("{slice}[{i}]");
+ f(&Binding { name, value });
+ }
+ }
+ }
+
+ fn destination(&self, destination: &Binding<hir::Destination>) {
+ self.option(field!(destination.label), "label", |label| {
+ self.ident(field!(label.ident));
+ });
+ }
+
+ fn ident(&self, ident: &Binding<Ident>) {
- out!("if {symbol}.as_str() == {:?};", symbol.value.as_str());
++ chain!(self, "{ident}.as_str() == {:?}", ident.value.as_str());
+ }
+
+ fn symbol(&self, symbol: &Binding<Symbol>) {
- out!("if matches!({qpath}, QPath::LangItem(LangItem::{lang_item:?}, _));");
++ chain!(self, "{symbol}.as_str() == {:?}", symbol.value.as_str());
+ }
+
+ fn qpath(&self, qpath: &Binding<&QPath<'_>>) {
+ if let QPath::LangItem(lang_item, ..) = *qpath.value {
- out!("if match_qpath({qpath}, &[{}]);", path_to_string(qpath.value));
++ chain!(self, "matches!({qpath}, QPath::LangItem(LangItem::{lang_item:?}, _))");
+ } else {
- let kind = |kind| out!("if let LitKind::{kind} = {lit}.node;");
++ chain!(self, "match_qpath({qpath}, &[{}])", path_to_string(qpath.value));
+ }
+ }
+
+ fn lit(&self, lit: &Binding<&Lit>) {
- out!("if let [{:?}] = **{vec};", vec.value);
++ let kind = |kind| chain!(self, "let LitKind::{kind} = {lit}.node");
+ macro_rules! kind {
+ ($($t:tt)*) => (kind(format_args!($($t)*)));
+ }
+
+ match lit.value.node {
+ LitKind::Bool(val) => kind!("Bool({val:?})"),
+ LitKind::Char(c) => kind!("Char({c:?})"),
+ LitKind::Err => kind!("Err"),
+ LitKind::Byte(b) => kind!("Byte({b})"),
+ LitKind::Int(i, suffix) => {
+ let int_ty = match suffix {
+ LitIntType::Signed(int_ty) => format!("LitIntType::Signed(IntTy::{int_ty:?})"),
+ LitIntType::Unsigned(uint_ty) => format!("LitIntType::Unsigned(UintTy::{uint_ty:?})"),
+ LitIntType::Unsuffixed => String::from("LitIntType::Unsuffixed"),
+ };
+ kind!("Int({i}, {int_ty})");
+ },
+ LitKind::Float(_, suffix) => {
+ let float_ty = match suffix {
+ LitFloatType::Suffixed(suffix_ty) => format!("LitFloatType::Suffixed(FloatTy::{suffix_ty:?})"),
+ LitFloatType::Unsuffixed => String::from("LitFloatType::Unsuffixed"),
+ };
+ kind!("Float(_, {float_ty})");
+ },
+ LitKind::ByteStr(ref vec) => {
+ bind!(self, vec);
+ kind!("ByteStr(ref {vec})");
- None => out!("if {arm}.guard.is_none();"),
++ chain!(self, "let [{:?}] = **{vec}", vec.value);
+ },
+ LitKind::Str(s, _) => {
+ bind!(self, s);
+ kind!("Str({s}, _)");
+ self.symbol(s);
+ },
+ }
+ }
+
+ fn arm(&self, arm: &Binding<&hir::Arm<'_>>) {
+ self.pat(field!(arm.pat));
+ match arm.value.guard {
- out!("if let Some(Guard::If({expr})) = {arm}.guard;");
++ None => chain!(self, "{arm}.guard.is_none()"),
+ Some(hir::Guard::If(expr)) => {
+ bind!(self, expr);
- out!("if let Some(Guard::IfLet({let_expr}) = {arm}.guard;");
++ chain!(self, "let Some(Guard::If({expr})) = {arm}.guard");
+ self.expr(expr);
+ },
+ Some(hir::Guard::IfLet(let_expr)) => {
+ bind!(self, let_expr);
- out!(
- "if let Some(higher::While {{ condition: {condition}, body: {body} }}) \
- = higher::While::hir({expr});"
++ chain!(self, "let Some(Guard::IfLet({let_expr}) = {arm}.guard");
+ self.pat(field!(let_expr.pat));
+ self.expr(field!(let_expr.init));
+ },
+ }
+ self.expr(field!(arm.body));
+ }
+
+ #[allow(clippy::too_many_lines)]
+ fn expr(&self, expr: &Binding<&hir::Expr<'_>>) {
+ if let Some(higher::While { condition, body }) = higher::While::hir(expr.value) {
+ bind!(self, condition, body);
- out!(
- "if let Some(higher::WhileLet {{ let_pat: {let_pat}, let_expr: {let_expr}, if_then: {if_then} }}) \
- = higher::WhileLet::hir({expr});"
++ chain!(
++ self,
++ "let Some(higher::While {{ condition: {condition}, body: {body} }}) \
++ = higher::While::hir({expr})"
+ );
+ self.expr(condition);
+ self.expr(body);
+ return;
+ }
+
+ if let Some(higher::WhileLet {
+ let_pat,
+ let_expr,
+ if_then,
+ }) = higher::WhileLet::hir(expr.value)
+ {
+ bind!(self, let_pat, let_expr, if_then);
- out!(
- "if let Some(higher::ForLoop {{ pat: {pat}, arg: {arg}, body: {body}, .. }}) \
- = higher::ForLoop::hir({expr});"
++ chain!(
++ self,
++ "let Some(higher::WhileLet {{ let_pat: {let_pat}, let_expr: {let_expr}, if_then: {if_then} }}) \
++ = higher::WhileLet::hir({expr})"
+ );
+ self.pat(let_pat);
+ self.expr(let_expr);
+ self.expr(if_then);
+ return;
+ }
+
+ if let Some(higher::ForLoop { pat, arg, body, .. }) = higher::ForLoop::hir(expr.value) {
+ bind!(self, pat, arg, body);
- let kind = |kind| out!("if let ExprKind::{kind} = {expr}.kind;");
++ chain!(
++ self,
++ "let Some(higher::ForLoop {{ pat: {pat}, arg: {arg}, body: {body}, .. }}) \
++ = higher::ForLoop::hir({expr})"
+ );
+ self.pat(pat);
+ self.expr(arg);
+ self.expr(body);
+ return;
+ }
+
- out!("if let TyKind::Path(ref {qpath}) = {let_expr}.ty.kind;");
++ let kind = |kind| chain!(self, "let ExprKind::{kind} = {expr}.kind");
+ macro_rules! kind {
+ ($($t:tt)*) => (kind(format_args!($($t)*)));
+ }
+
+ match expr.value.kind {
+ ExprKind::Let(let_expr) => {
+ bind!(self, let_expr);
+ kind!("Let({let_expr})");
+ self.pat(field!(let_expr.pat));
+ // Does what ExprKind::Cast does, only adds a clause for the type
+ // if it's a path
+ if let Some(TyKind::Path(ref qpath)) = let_expr.value.ty.as_ref().map(|ty| &ty.kind) {
+ bind!(self, qpath);
- out!("if BinOpKind::{:?} == {op}.node;", op.value.node);
++ chain!(self, "let TyKind::Path(ref {qpath}) = {let_expr}.ty.kind");
+ self.qpath(qpath);
+ }
+ self.expr(field!(let_expr.init));
+ },
+ ExprKind::Box(inner) => {
+ bind!(self, inner);
+ kind!("Box({inner})");
+ self.expr(inner);
+ },
+ ExprKind::Array(elements) => {
+ bind!(self, elements);
+ kind!("Array({elements})");
+ self.slice(elements, |e| self.expr(e));
+ },
+ ExprKind::Call(func, args) => {
+ bind!(self, func, args);
+ kind!("Call({func}, {args})");
+ self.expr(func);
+ self.slice(args, |e| self.expr(e));
+ },
+ ExprKind::MethodCall(method_name, receiver, args, _) => {
+ bind!(self, method_name, receiver, args);
+ kind!("MethodCall({method_name}, {receiver}, {args}, _)");
+ self.ident(field!(method_name.ident));
+ self.expr(receiver);
+ self.slice(args, |e| self.expr(e));
+ },
+ ExprKind::Tup(elements) => {
+ bind!(self, elements);
+ kind!("Tup({elements})");
+ self.slice(elements, |e| self.expr(e));
+ },
+ ExprKind::Binary(op, left, right) => {
+ bind!(self, op, left, right);
+ kind!("Binary({op}, {left}, {right})");
- out!("if let TyKind::Path(ref {qpath}) = {cast_ty}.kind;");
++ chain!(self, "BinOpKind::{:?} == {op}.node", op.value.node);
+ self.expr(left);
+ self.expr(right);
+ },
+ ExprKind::Unary(op, inner) => {
+ bind!(self, inner);
+ kind!("Unary(UnOp::{op:?}, {inner})");
+ self.expr(inner);
+ },
+ ExprKind::Lit(ref lit) => {
+ bind!(self, lit);
+ kind!("Lit(ref {lit})");
+ self.lit(lit);
+ },
+ ExprKind::Cast(expr, cast_ty) => {
+ bind!(self, expr, cast_ty);
+ kind!("Cast({expr}, {cast_ty})");
+ if let TyKind::Path(ref qpath) = cast_ty.value.kind {
+ bind!(self, qpath);
- out!("if let {ret_ty} = {fn_decl}.output;");
++ chain!(self, "let TyKind::Path(ref {qpath}) = {cast_ty}.kind");
+ self.qpath(qpath);
+ }
+ self.expr(expr);
+ },
+ ExprKind::Type(expr, _ty) => {
+ bind!(self, expr);
+ kind!("Type({expr}, _)");
+ self.expr(expr);
+ },
+ ExprKind::Loop(body, label, des, _) => {
+ bind!(self, body);
+ opt_bind!(self, label);
+ kind!("Loop({body}, {label}, LoopSource::{des:?}, _)");
+ self.block(body);
+ label.if_some(|l| self.ident(field!(l.ident)));
+ },
+ ExprKind::If(cond, then, else_expr) => {
+ bind!(self, cond, then);
+ opt_bind!(self, else_expr);
+ kind!("If({cond}, {then}, {else_expr})");
+ self.expr(cond);
+ self.expr(then);
+ else_expr.if_some(|e| self.expr(e));
+ },
+ ExprKind::Match(scrutinee, arms, des) => {
+ bind!(self, scrutinee, arms);
+ kind!("Match({scrutinee}, {arms}, MatchSource::{des:?})");
+ self.expr(scrutinee);
+ self.slice(arms, |arm| self.arm(arm));
+ },
+ ExprKind::Closure(&Closure {
+ capture_clause,
+ fn_decl,
+ body: body_id,
+ movability,
+ ..
+ }) => {
+ let movability = OptionPat::new(movability.map(|m| format!("Movability::{m:?}")));
+
+ let ret_ty = match fn_decl.output {
+ FnRetTy::DefaultReturn(_) => "FnRetTy::DefaultReturn(_)",
+ FnRetTy::Return(_) => "FnRetTy::Return(_ty)",
+ };
+
+ bind!(self, fn_decl, body_id);
+ kind!("Closure(CaptureBy::{capture_clause:?}, {fn_decl}, {body_id}, _, {movability})");
- out!("if BinOpKind::{:?} == {op}.node;", op.value.node);
++ chain!(self, "let {ret_ty} = {fn_decl}.output");
+ self.body(body_id);
+ },
+ ExprKind::Yield(sub, source) => {
+ bind!(self, sub);
+ kind!("Yield(sub, YieldSource::{source:?})");
+ self.expr(sub);
+ },
+ ExprKind::Block(block, label) => {
+ bind!(self, block);
+ opt_bind!(self, label);
+ kind!("Block({block}, {label})");
+ self.block(block);
+ label.if_some(|l| self.ident(field!(l.ident)));
+ },
+ ExprKind::Assign(target, value, _) => {
+ bind!(self, target, value);
+ kind!("Assign({target}, {value}, _span)");
+ self.expr(target);
+ self.expr(value);
+ },
+ ExprKind::AssignOp(op, target, value) => {
+ bind!(self, op, target, value);
+ kind!("AssignOp({op}, {target}, {value})");
- ArrayLen::Infer(..) => out!("if let ArrayLen::Infer(..) = length;"),
++ chain!(self, "BinOpKind::{:?} == {op}.node", op.value.node);
+ self.expr(target);
+ self.expr(value);
+ },
+ ExprKind::Field(object, field_name) => {
+ bind!(self, object, field_name);
+ kind!("Field({object}, {field_name})");
+ self.ident(field_name);
+ self.expr(object);
+ },
+ ExprKind::Index(object, index) => {
+ bind!(self, object, index);
+ kind!("Index({object}, {index})");
+ self.expr(object);
+ self.expr(index);
+ },
+ ExprKind::Path(ref qpath) => {
+ bind!(self, qpath);
+ kind!("Path(ref {qpath})");
+ self.qpath(qpath);
+ },
+ ExprKind::AddrOf(kind, mutability, inner) => {
+ bind!(self, inner);
+ kind!("AddrOf(BorrowKind::{kind:?}, Mutability::{mutability:?}, {inner})");
+ self.expr(inner);
+ },
+ ExprKind::Break(destination, value) => {
+ bind!(self, destination);
+ opt_bind!(self, value);
+ kind!("Break({destination}, {value})");
+ self.destination(destination);
+ value.if_some(|e| self.expr(e));
+ },
+ ExprKind::Continue(destination) => {
+ bind!(self, destination);
+ kind!("Continue({destination})");
+ self.destination(destination);
+ },
+ ExprKind::Ret(value) => {
+ opt_bind!(self, value);
+ kind!("Ret({value})");
+ value.if_some(|e| self.expr(e));
+ },
+ ExprKind::InlineAsm(_) => {
+ kind!("InlineAsm(_)");
+ out!("// unimplemented: `ExprKind::InlineAsm` is not further destructured at the moment");
+ },
+ ExprKind::Struct(qpath, fields, base) => {
+ bind!(self, qpath, fields);
+ opt_bind!(self, base);
+ kind!("Struct({qpath}, {fields}, {base})");
+ self.qpath(qpath);
+ self.slice(fields, |field| {
+ self.ident(field!(field.ident));
+ self.expr(field!(field.expr));
+ });
+ base.if_some(|e| self.expr(e));
+ },
+ ExprKind::ConstBlock(_) => kind!("ConstBlock(_)"),
+ ExprKind::Repeat(value, length) => {
+ bind!(self, value, length);
+ kind!("Repeat({value}, {length})");
+ self.expr(value);
+ match length.value {
- out!("if let ArrayLen::Body({anon_const}) = {length};");
++ ArrayLen::Infer(..) => chain!(self, "let ArrayLen::Infer(..) = length"),
+ ArrayLen::Body(anon_const) => {
+ bind!(self, anon_const);
- out!("let {expr} = &cx.tcx.hir().body({body_id}).value;");
++ chain!(self, "let ArrayLen::Body({anon_const}) = {length}");
+ self.body(field!(anon_const.body));
+ },
+ }
+ },
+ ExprKind::Err => kind!("Err"),
+ ExprKind::DropTemps(expr) => {
+ bind!(self, expr);
+ kind!("DropTemps({expr})");
+ self.expr(expr);
+ },
+ }
+ }
+
+ fn block(&self, block: &Binding<&hir::Block<'_>>) {
+ self.slice(field!(block.stmts), |stmt| self.stmt(stmt));
+ self.option(field!(block.expr), "trailing_expr", |expr| {
+ self.expr(expr);
+ });
+ }
+
+ fn body(&self, body_id: &Binding<hir::BodyId>) {
+ let expr = self.cx.tcx.hir().body(body_id.value).value;
+ bind!(self, expr);
- let kind = |kind| out!("if let PatKind::{kind} = {pat}.kind;");
++ chain!(self, "{expr} = &cx.tcx.hir().body({body_id}).value");
+ self.expr(expr);
+ }
+
+ fn pat(&self, pat: &Binding<&hir::Pat<'_>>) {
- let kind = |kind| out!("if let StmtKind::{kind} = {stmt}.kind;");
++ let kind = |kind| chain!(self, "let PatKind::{kind} = {pat}.kind");
+ macro_rules! kind {
+ ($($t:tt)*) => (kind(format_args!($($t)*)));
+ }
+
+ match pat.value.kind {
+ PatKind::Wild => kind!("Wild"),
+ PatKind::Binding(ann, _, name, sub) => {
+ bind!(self, name);
+ opt_bind!(self, sub);
+ let ann = match ann {
+ BindingAnnotation::NONE => "NONE",
+ BindingAnnotation::REF => "REF",
+ BindingAnnotation::MUT => "MUT",
+ BindingAnnotation::REF_MUT => "REF_MUT",
+ };
+ kind!("Binding(BindingAnnotation::{ann}, _, {name}, {sub})");
+ self.ident(name);
+ sub.if_some(|p| self.pat(p));
+ },
+ PatKind::Struct(ref qpath, fields, ignore) => {
+ bind!(self, qpath, fields);
+ kind!("Struct(ref {qpath}, {fields}, {ignore})");
+ self.qpath(qpath);
+ self.slice(fields, |field| {
+ self.ident(field!(field.ident));
+ self.pat(field!(field.pat));
+ });
+ },
+ PatKind::Or(fields) => {
+ bind!(self, fields);
+ kind!("Or({fields})");
+ self.slice(fields, |pat| self.pat(pat));
+ },
+ PatKind::TupleStruct(ref qpath, fields, skip_pos) => {
+ bind!(self, qpath, fields);
+ kind!("TupleStruct(ref {qpath}, {fields}, {skip_pos:?})");
+ self.qpath(qpath);
+ self.slice(fields, |pat| self.pat(pat));
+ },
+ PatKind::Path(ref qpath) => {
+ bind!(self, qpath);
+ kind!("Path(ref {qpath})");
+ self.qpath(qpath);
+ },
+ PatKind::Tuple(fields, skip_pos) => {
+ bind!(self, fields);
+ kind!("Tuple({fields}, {skip_pos:?})");
+ self.slice(fields, |field| self.pat(field));
+ },
+ PatKind::Box(pat) => {
+ bind!(self, pat);
+ kind!("Box({pat})");
+ self.pat(pat);
+ },
+ PatKind::Ref(pat, muta) => {
+ bind!(self, pat);
+ kind!("Ref({pat}, Mutability::{muta:?})");
+ self.pat(pat);
+ },
+ PatKind::Lit(lit_expr) => {
+ bind!(self, lit_expr);
+ kind!("Lit({lit_expr})");
+ self.expr(lit_expr);
+ },
+ PatKind::Range(start, end, end_kind) => {
+ opt_bind!(self, start, end);
+ kind!("Range({start}, {end}, RangeEnd::{end_kind:?})");
+ start.if_some(|e| self.expr(e));
+ end.if_some(|e| self.expr(e));
+ },
+ PatKind::Slice(start, middle, end) => {
+ bind!(self, start, end);
+ opt_bind!(self, middle);
+ kind!("Slice({start}, {middle}, {end})");
+ middle.if_some(|p| self.pat(p));
+ self.slice(start, |pat| self.pat(pat));
+ self.slice(end, |pat| self.pat(pat));
+ },
+ }
+ }
+
+ fn stmt(&self, stmt: &Binding<&hir::Stmt<'_>>) {
++ let kind = |kind| chain!(self, "let StmtKind::{kind} = {stmt}.kind");
+ macro_rules! kind {
+ ($($t:tt)*) => (kind(format_args!($($t)*)));
+ }
+
+ match stmt.value.kind {
+ StmtKind::Local(local) => {
+ bind!(self, local);
+ kind!("Local({local})");
+ self.option(field!(local.init), "init", |init| {
+ self.expr(init);
+ });
+ self.pat(field!(local.pat));
+ },
+ StmtKind::Item(_) => kind!("Item(item_id)"),
+ StmtKind::Expr(e) => {
+ bind!(self, e);
+ kind!("Expr({e})");
+ self.expr(e);
+ },
+ StmtKind::Semi(e) => {
+ bind!(self, e);
+ kind!("Semi({e})");
+ self.expr(e);
+ },
+ }
+ }
+}
+
+fn has_attr(cx: &LateContext<'_>, hir_id: hir::HirId) -> bool {
+ let attrs = cx.tcx.hir().attrs(hir_id);
+ get_attr(cx.sess(), attrs, "author").count() > 0
+}
+
+fn path_to_string(path: &QPath<'_>) -> String {
+ fn inner(s: &mut String, path: &QPath<'_>) {
+ match *path {
+ QPath::Resolved(_, path) => {
+ for (i, segment) in path.segments.iter().enumerate() {
+ if i > 0 {
+ *s += ", ";
+ }
+ write!(s, "{:?}", segment.ident.as_str()).unwrap();
+ }
+ },
+ QPath::TypeRelative(ty, segment) => match &ty.kind {
+ hir::TyKind::Path(inner_path) => {
+ inner(s, inner_path);
+ *s += ", ";
+ write!(s, "{:?}", segment.ident.as_str()).unwrap();
+ },
+ other => write!(s, "/* unimplemented: {other:?}*/").unwrap(),
+ },
+ QPath::LangItem(..) => panic!("path_to_string: called for lang item qpath"),
+ }
+ }
+ let mut s = String::new();
+ inner(&mut s, path);
+ s
+}
--- /dev/null
- use crate::utils::internal_lints::metadata_collector::is_deprecated_lint;
- use clippy_utils::consts::{constant_simple, Constant};
- use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
- use clippy_utils::macros::root_macro_call_first_node;
- use clippy_utils::source::{snippet, snippet_with_applicability};
- use clippy_utils::ty::match_type;
- use clippy_utils::{
- def_path_res, higher, is_else_clause, is_expn_of, is_expr_path_def_path, is_lint_allowed, match_any_def_paths,
- match_def_path, method_calls, paths, peel_blocks_with_stmt, peel_hir_expr_refs, SpanlessEq,
- };
- use if_chain::if_chain;
- use rustc_ast as ast;
- use rustc_ast::ast::{Crate, ItemKind, LitKind, ModKind, NodeId};
- use rustc_ast::visit::FnKind;
- use rustc_data_structures::fx::{FxHashMap, FxHashSet};
- use rustc_errors::Applicability;
- use rustc_hir as hir;
- use rustc_hir::def::{DefKind, Namespace, Res};
- use rustc_hir::def_id::DefId;
- use rustc_hir::hir_id::CRATE_HIR_ID;
- use rustc_hir::intravisit::Visitor;
- use rustc_hir::{
- BinOpKind, Block, Closure, Expr, ExprKind, HirId, Item, Local, MutTy, Mutability, Node, Path, Stmt, StmtKind,
- TyKind, UnOp,
- };
- use rustc_hir_analysis::hir_ty_to_ty;
- use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
- use rustc_middle::hir::nested_filter;
- use rustc_middle::mir::interpret::{Allocation, ConstValue, GlobalAlloc};
- use rustc_middle::ty::{
- self, fast_reject::SimplifiedTypeGen, subst::GenericArgKind, AssocKind, DefIdTree, FloatTy, Ty,
- };
- use rustc_semver::RustcVersion;
- use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
- use rustc_span::source_map::Spanned;
- use rustc_span::symbol::{Ident, Symbol};
- use rustc_span::{sym, BytePos, Span};
-
- use std::borrow::{Borrow, Cow};
- use std::str;
-
- #[cfg(feature = "internal")]
++pub mod clippy_lints_internal;
++pub mod collapsible_calls;
++pub mod compiler_lint_functions;
++pub mod if_chain_style;
++pub mod interning_defined_symbol;
++pub mod invalid_paths;
++pub mod lint_without_lint_pass;
+pub mod metadata_collector;
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for various things we like to keep tidy in clippy.
- ///
- /// ### Why is this bad?
- /// We like to pretend we're an example of tidy code.
- ///
- /// ### Example
- /// Wrong ordering of the util::paths constants.
- pub CLIPPY_LINTS_INTERNAL,
- internal,
- "various things that will negatively affect your clippy experience"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Ensures every lint is associated to a `LintPass`.
- ///
- /// ### Why is this bad?
- /// The compiler only knows lints via a `LintPass`. Without
- /// putting a lint to a `LintPass::get_lints()`'s return, the compiler will not
- /// know the name of the lint.
- ///
- /// ### Known problems
- /// Only checks for lints associated using the
- /// `declare_lint_pass!`, `impl_lint_pass!`, and `lint_array!` macros.
- ///
- /// ### Example
- /// ```rust,ignore
- /// declare_lint! { pub LINT_1, ... }
- /// declare_lint! { pub LINT_2, ... }
- /// declare_lint! { pub FORGOTTEN_LINT, ... }
- /// // ...
- /// declare_lint_pass!(Pass => [LINT_1, LINT_2]);
- /// // missing FORGOTTEN_LINT
- /// ```
- pub LINT_WITHOUT_LINT_PASS,
- internal,
- "declaring a lint without associating it in a LintPass"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for calls to `cx.span_lint*` and suggests to use the `utils::*`
- /// variant of the function.
- ///
- /// ### Why is this bad?
- /// The `utils::*` variants also add a link to the Clippy documentation to the
- /// warning/error messages.
- ///
- /// ### Example
- /// ```rust,ignore
- /// cx.span_lint(LINT_NAME, "message");
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// utils::span_lint(cx, LINT_NAME, "message");
- /// ```
- pub COMPILER_LINT_FUNCTIONS,
- internal,
- "usage of the lint functions of the compiler instead of the utils::* variant"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for calls to `cx.outer().expn_data()` and suggests to use
- /// the `cx.outer_expn_data()`
- ///
- /// ### Why is this bad?
- /// `cx.outer_expn_data()` is faster and more concise.
- ///
- /// ### Example
- /// ```rust,ignore
- /// expr.span.ctxt().outer().expn_data()
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// expr.span.ctxt().outer_expn_data()
- /// ```
- pub OUTER_EXPN_EXPN_DATA,
- internal,
- "using `cx.outer_expn().expn_data()` instead of `cx.outer_expn_data()`"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Not an actual lint. This lint is only meant for testing our customized internal compiler
- /// error message by calling `panic`.
- ///
- /// ### Why is this bad?
- /// ICE in large quantities can damage your teeth
- ///
- /// ### Example
- /// ```rust,ignore
- /// 🍦🍦🍦🍦🍦
- /// ```
- pub PRODUCE_ICE,
- internal,
- "this message should not appear anywhere as we ICE before and don't emit the lint"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for cases of an auto-generated lint without an updated description,
- /// i.e. `default lint description`.
- ///
- /// ### Why is this bad?
- /// Indicates that the lint is not finished.
- ///
- /// ### Example
- /// ```rust,ignore
- /// declare_lint! { pub COOL_LINT, nursery, "default lint description" }
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// declare_lint! { pub COOL_LINT, nursery, "a great new lint" }
- /// ```
- pub DEFAULT_LINT,
- internal,
- "found 'default lint description' in a lint declaration"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Lints `span_lint_and_then` function calls, where the
- /// closure argument has only one statement and that statement is a method
- /// call to `span_suggestion`, `span_help`, `span_note` (using the same
- /// span), `help` or `note`.
- ///
- /// These usages of `span_lint_and_then` should be replaced with one of the
- /// wrapper functions `span_lint_and_sugg`, span_lint_and_help`, or
- /// `span_lint_and_note`.
- ///
- /// ### Why is this bad?
- /// Using the wrapper `span_lint_and_*` functions, is more
- /// convenient, readable and less error prone.
- ///
- /// ### Example
- /// ```rust,ignore
- /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
- /// diag.span_suggestion(
- /// expr.span,
- /// help_msg,
- /// sugg.to_string(),
- /// Applicability::MachineApplicable,
- /// );
- /// });
- /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
- /// diag.span_help(expr.span, help_msg);
- /// });
- /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
- /// diag.help(help_msg);
- /// });
- /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
- /// diag.span_note(expr.span, note_msg);
- /// });
- /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
- /// diag.note(note_msg);
- /// });
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// span_lint_and_sugg(
- /// cx,
- /// TEST_LINT,
- /// expr.span,
- /// lint_msg,
- /// help_msg,
- /// sugg.to_string(),
- /// Applicability::MachineApplicable,
- /// );
- /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), help_msg);
- /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, None, help_msg);
- /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), note_msg);
- /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, None, note_msg);
- /// ```
- pub COLLAPSIBLE_SPAN_LINT_CALLS,
- internal,
- "found collapsible `span_lint_and_then` calls"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for usages of def paths when a diagnostic item or a `LangItem` could be used.
- ///
- /// ### Why is this bad?
- /// The path for an item is subject to change and is less efficient to look up than a
- /// diagnostic item or a `LangItem`.
- ///
- /// ### Example
- /// ```rust,ignore
- /// utils::match_type(cx, ty, &paths::VEC)
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// utils::is_type_diagnostic_item(cx, ty, sym::Vec)
- /// ```
- pub UNNECESSARY_DEF_PATH,
- internal,
- "using a def path when a diagnostic item or a `LangItem` is available"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks the paths module for invalid paths.
- ///
- /// ### Why is this bad?
- /// It indicates a bug in the code.
- ///
- /// ### Example
- /// None.
- pub INVALID_PATHS,
- internal,
- "invalid path"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for interning symbols that have already been pre-interned and defined as constants.
- ///
- /// ### Why is this bad?
- /// It's faster and easier to use the symbol constant.
- ///
- /// ### Example
- /// ```rust,ignore
- /// let _ = sym!(f32);
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// let _ = sym::f32;
- /// ```
- pub INTERNING_DEFINED_SYMBOL,
- internal,
- "interning a symbol that is pre-interned and defined as a constant"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for unnecessary conversion from Symbol to a string.
- ///
- /// ### Why is this bad?
- /// It's faster use symbols directly instead of strings.
- ///
- /// ### Example
- /// ```rust,ignore
- /// symbol.as_str() == "clippy";
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// symbol == sym::clippy;
- /// ```
- pub UNNECESSARY_SYMBOL_STR,
- internal,
- "unnecessary conversion between Symbol and string"
- }
-
- declare_clippy_lint! {
- /// Finds unidiomatic usage of `if_chain!`
- pub IF_CHAIN_STYLE,
- internal,
- "non-idiomatic `if_chain!` usage"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for invalid `clippy::version` attributes.
- ///
- /// Valid values are:
- /// * "pre 1.29.0"
- /// * any valid semantic version
- pub INVALID_CLIPPY_VERSION_ATTRIBUTE,
- internal,
- "found an invalid `clippy::version` attribute"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for declared clippy lints without the `clippy::version` attribute.
- ///
- pub MISSING_CLIPPY_VERSION_ATTRIBUTE,
- internal,
- "found clippy lint without `clippy::version` attribute"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Check that the `extract_msrv_attr!` macro is used, when a lint has a MSRV.
- ///
- pub MISSING_MSRV_ATTR_IMPL,
- internal,
- "checking if all necessary steps were taken when adding a MSRV to a lint"
- }
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for cases of an auto-generated deprecated lint without an updated reason,
- /// i.e. `"default deprecation note"`.
- ///
- /// ### Why is this bad?
- /// Indicates that the documentation is incomplete.
- ///
- /// ### Example
- /// ```rust,ignore
- /// declare_deprecated_lint! {
- /// /// ### What it does
- /// /// Nothing. This lint has been deprecated.
- /// ///
- /// /// ### Deprecation reason
- /// /// TODO
- /// #[clippy::version = "1.63.0"]
- /// pub COOL_LINT,
- /// "default deprecation note"
- /// }
- /// ```
- ///
- /// Use instead:
- /// ```rust,ignore
- /// declare_deprecated_lint! {
- /// /// ### What it does
- /// /// Nothing. This lint has been deprecated.
- /// ///
- /// /// ### Deprecation reason
- /// /// This lint has been replaced by `cooler_lint`
- /// #[clippy::version = "1.63.0"]
- /// pub COOL_LINT,
- /// "this lint has been replaced by `cooler_lint`"
- /// }
- /// ```
- pub DEFAULT_DEPRECATION_REASON,
- internal,
- "found 'default deprecation note' in a deprecated lint declaration"
- }
-
- declare_lint_pass!(ClippyLintsInternal => [CLIPPY_LINTS_INTERNAL]);
-
- impl EarlyLintPass for ClippyLintsInternal {
- fn check_crate(&mut self, cx: &EarlyContext<'_>, krate: &Crate) {
- if let Some(utils) = krate.items.iter().find(|item| item.ident.name.as_str() == "utils") {
- if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = utils.kind {
- if let Some(paths) = items.iter().find(|item| item.ident.name.as_str() == "paths") {
- if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = paths.kind {
- let mut last_name: Option<&str> = None;
- for item in items {
- let name = item.ident.as_str();
- if let Some(last_name) = last_name {
- if *last_name > *name {
- span_lint(
- cx,
- CLIPPY_LINTS_INTERNAL,
- item.span,
- "this constant should be before the previous constant due to lexical \
- ordering",
- );
- }
- }
- last_name = Some(name);
- }
- }
- }
- }
- }
- }
- }
-
- #[derive(Clone, Debug, Default)]
- pub struct LintWithoutLintPass {
- declared_lints: FxHashMap<Symbol, Span>,
- registered_lints: FxHashSet<Symbol>,
- }
-
- impl_lint_pass!(LintWithoutLintPass => [DEFAULT_LINT, LINT_WITHOUT_LINT_PASS, INVALID_CLIPPY_VERSION_ATTRIBUTE, MISSING_CLIPPY_VERSION_ATTRIBUTE, DEFAULT_DEPRECATION_REASON]);
-
- impl<'tcx> LateLintPass<'tcx> for LintWithoutLintPass {
- fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
- if is_lint_allowed(cx, DEFAULT_LINT, item.hir_id())
- || is_lint_allowed(cx, DEFAULT_DEPRECATION_REASON, item.hir_id())
- {
- return;
- }
-
- if let hir::ItemKind::Static(ty, Mutability::Not, body_id) = item.kind {
- let is_lint_ref_ty = is_lint_ref_type(cx, ty);
- if is_deprecated_lint(cx, ty) || is_lint_ref_ty {
- check_invalid_clippy_version_attribute(cx, item);
-
- let expr = &cx.tcx.hir().body(body_id).value;
- let fields;
- if is_lint_ref_ty {
- if let ExprKind::AddrOf(_, _, inner_exp) = expr.kind
- && let ExprKind::Struct(_, struct_fields, _) = inner_exp.kind {
- fields = struct_fields;
- } else {
- return;
- }
- } else if let ExprKind::Struct(_, struct_fields, _) = expr.kind {
- fields = struct_fields;
- } else {
- return;
- }
-
- let field = fields
- .iter()
- .find(|f| f.ident.as_str() == "desc")
- .expect("lints must have a description field");
-
- if let ExprKind::Lit(Spanned {
- node: LitKind::Str(ref sym, _),
- ..
- }) = field.expr.kind
- {
- let sym_str = sym.as_str();
- if is_lint_ref_ty {
- if sym_str == "default lint description" {
- span_lint(
- cx,
- DEFAULT_LINT,
- item.span,
- &format!("the lint `{}` has the default lint description", item.ident.name),
- );
- }
-
- self.declared_lints.insert(item.ident.name, item.span);
- } else if sym_str == "default deprecation note" {
- span_lint(
- cx,
- DEFAULT_DEPRECATION_REASON,
- item.span,
- &format!("the lint `{}` has the default deprecation reason", item.ident.name),
- );
- }
- }
- }
- } else if let Some(macro_call) = root_macro_call_first_node(cx, item) {
- if !matches!(
- cx.tcx.item_name(macro_call.def_id).as_str(),
- "impl_lint_pass" | "declare_lint_pass"
- ) {
- return;
- }
- if let hir::ItemKind::Impl(hir::Impl {
- of_trait: None,
- items: impl_item_refs,
- ..
- }) = item.kind
- {
- let mut collector = LintCollector {
- output: &mut self.registered_lints,
- cx,
- };
- let body_id = cx.tcx.hir().body_owned_by(
- cx.tcx.hir().local_def_id(
- impl_item_refs
- .iter()
- .find(|iiref| iiref.ident.as_str() == "get_lints")
- .expect("LintPass needs to implement get_lints")
- .id
- .hir_id(),
- ),
- );
- collector.visit_expr(cx.tcx.hir().body(body_id).value);
- }
- }
- }
-
- fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
- if is_lint_allowed(cx, LINT_WITHOUT_LINT_PASS, CRATE_HIR_ID) {
- return;
- }
-
- for (lint_name, &lint_span) in &self.declared_lints {
- // When using the `declare_tool_lint!` macro, the original `lint_span`'s
- // file points to "<rustc macros>".
- // `compiletest-rs` thinks that's an error in a different file and
- // just ignores it. This causes the test in compile-fail/lint_pass
- // not able to capture the error.
- // Therefore, we need to climb the macro expansion tree and find the
- // actual span that invoked `declare_tool_lint!`:
- let lint_span = lint_span.ctxt().outer_expn_data().call_site;
-
- if !self.registered_lints.contains(lint_name) {
- span_lint(
- cx,
- LINT_WITHOUT_LINT_PASS,
- lint_span,
- &format!("the lint `{lint_name}` is not added to any `LintPass`"),
- );
- }
- }
- }
- }
-
- fn is_lint_ref_type<'tcx>(cx: &LateContext<'tcx>, ty: &hir::Ty<'_>) -> bool {
- if let TyKind::Rptr(
- _,
- MutTy {
- ty: inner,
- mutbl: Mutability::Not,
- },
- ) = ty.kind
- {
- if let TyKind::Path(ref path) = inner.kind {
- if let Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, inner.hir_id) {
- return match_def_path(cx, def_id, &paths::LINT);
- }
- }
- }
-
- false
- }
-
- fn check_invalid_clippy_version_attribute(cx: &LateContext<'_>, item: &'_ Item<'_>) {
- if let Some(value) = extract_clippy_version_value(cx, item) {
- // The `sym!` macro doesn't work as it only expects a single token.
- // It's better to keep it this way and have a direct `Symbol::intern` call here.
- if value == Symbol::intern("pre 1.29.0") {
- return;
- }
-
- if RustcVersion::parse(value.as_str()).is_err() {
- span_lint_and_help(
- cx,
- INVALID_CLIPPY_VERSION_ATTRIBUTE,
- item.span,
- "this item has an invalid `clippy::version` attribute",
- None,
- "please use a valid semantic version, see `doc/adding_lints.md`",
- );
- }
- } else {
- span_lint_and_help(
- cx,
- MISSING_CLIPPY_VERSION_ATTRIBUTE,
- item.span,
- "this lint is missing the `clippy::version` attribute or version value",
- None,
- "please use a `clippy::version` attribute, see `doc/adding_lints.md`",
- );
- }
- }
-
- /// This function extracts the version value of a `clippy::version` attribute if the given value has
- /// one
- fn extract_clippy_version_value(cx: &LateContext<'_>, item: &'_ Item<'_>) -> Option<Symbol> {
- let attrs = cx.tcx.hir().attrs(item.hir_id());
- attrs.iter().find_map(|attr| {
- if_chain! {
- // Identify attribute
- if let ast::AttrKind::Normal(ref attr_kind) = &attr.kind;
- if let [tool_name, attr_name] = &attr_kind.item.path.segments[..];
- if tool_name.ident.name == sym::clippy;
- if attr_name.ident.name == sym::version;
- if let Some(version) = attr.value_str();
- then {
- Some(version)
- } else {
- None
- }
- }
- })
- }
-
- struct LintCollector<'a, 'tcx> {
- output: &'a mut FxHashSet<Symbol>,
- cx: &'a LateContext<'tcx>,
- }
-
- impl<'a, 'tcx> Visitor<'tcx> for LintCollector<'a, 'tcx> {
- type NestedFilter = nested_filter::All;
-
- fn visit_path(&mut self, path: &'tcx Path<'_>, _: HirId) {
- if path.segments.len() == 1 {
- self.output.insert(path.segments[0].ident.name);
- }
- }
-
- fn nested_visit_map(&mut self) -> Self::Map {
- self.cx.tcx.hir()
- }
- }
-
- #[derive(Clone, Default)]
- pub struct CompilerLintFunctions {
- map: FxHashMap<&'static str, &'static str>,
- }
-
- impl CompilerLintFunctions {
- #[must_use]
- pub fn new() -> Self {
- let mut map = FxHashMap::default();
- map.insert("span_lint", "utils::span_lint");
- map.insert("struct_span_lint", "utils::span_lint");
- map.insert("lint", "utils::span_lint");
- map.insert("span_lint_note", "utils::span_lint_and_note");
- map.insert("span_lint_help", "utils::span_lint_and_help");
- Self { map }
- }
- }
-
- impl_lint_pass!(CompilerLintFunctions => [COMPILER_LINT_FUNCTIONS]);
-
- impl<'tcx> LateLintPass<'tcx> for CompilerLintFunctions {
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
- if is_lint_allowed(cx, COMPILER_LINT_FUNCTIONS, expr.hir_id) {
- return;
- }
-
- if_chain! {
- if let ExprKind::MethodCall(path, self_arg, _, _) = &expr.kind;
- let fn_name = path.ident;
- if let Some(sugg) = self.map.get(fn_name.as_str());
- let ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
- if match_type(cx, ty, &paths::EARLY_CONTEXT)
- || match_type(cx, ty, &paths::LATE_CONTEXT);
- then {
- span_lint_and_help(
- cx,
- COMPILER_LINT_FUNCTIONS,
- path.ident.span,
- "usage of a compiler lint function",
- None,
- &format!("please use the Clippy variant of this function: `{sugg}`"),
- );
- }
- }
- }
- }
-
- declare_lint_pass!(OuterExpnDataPass => [OUTER_EXPN_EXPN_DATA]);
-
- impl<'tcx> LateLintPass<'tcx> for OuterExpnDataPass {
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
- if is_lint_allowed(cx, OUTER_EXPN_EXPN_DATA, expr.hir_id) {
- return;
- }
-
- let (method_names, arg_lists, spans) = method_calls(expr, 2);
- let method_names: Vec<&str> = method_names.iter().map(Symbol::as_str).collect();
- if_chain! {
- if let ["expn_data", "outer_expn"] = method_names.as_slice();
- let (self_arg, args)= arg_lists[1];
- if args.is_empty();
- let self_ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
- if match_type(cx, self_ty, &paths::SYNTAX_CONTEXT);
- then {
- span_lint_and_sugg(
- cx,
- OUTER_EXPN_EXPN_DATA,
- spans[1].with_hi(expr.span.hi()),
- "usage of `outer_expn().expn_data()`",
- "try",
- "outer_expn_data()".to_string(),
- Applicability::MachineApplicable,
- );
- }
- }
- }
- }
-
- declare_lint_pass!(ProduceIce => [PRODUCE_ICE]);
-
- impl EarlyLintPass for ProduceIce {
- fn check_fn(&mut self, _: &EarlyContext<'_>, fn_kind: FnKind<'_>, _: Span, _: NodeId) {
- assert!(!is_trigger_fn(fn_kind), "Would you like some help with that?");
- }
- }
-
- fn is_trigger_fn(fn_kind: FnKind<'_>) -> bool {
- match fn_kind {
- FnKind::Fn(_, ident, ..) => ident.name.as_str() == "it_looks_like_you_are_trying_to_kill_clippy",
- FnKind::Closure(..) => false,
- }
- }
-
- declare_lint_pass!(CollapsibleCalls => [COLLAPSIBLE_SPAN_LINT_CALLS]);
-
- impl<'tcx> LateLintPass<'tcx> for CollapsibleCalls {
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
- if is_lint_allowed(cx, COLLAPSIBLE_SPAN_LINT_CALLS, expr.hir_id) {
- return;
- }
-
- if_chain! {
- if let ExprKind::Call(func, and_then_args) = expr.kind;
- if is_expr_path_def_path(cx, func, &["clippy_utils", "diagnostics", "span_lint_and_then"]);
- if and_then_args.len() == 5;
- if let ExprKind::Closure(&Closure { body, .. }) = &and_then_args[4].kind;
- let body = cx.tcx.hir().body(body);
- let only_expr = peel_blocks_with_stmt(body.value);
- if let ExprKind::MethodCall(ps, recv, span_call_args, _) = &only_expr.kind;
- if let ExprKind::Path(..) = recv.kind;
- then {
- let and_then_snippets = get_and_then_snippets(cx, and_then_args);
- let mut sle = SpanlessEq::new(cx).deny_side_effects();
- match ps.ident.as_str() {
- "span_suggestion" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
- suggest_suggestion(cx, expr, &and_then_snippets, &span_suggestion_snippets(cx, span_call_args));
- },
- "span_help" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
- let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
- suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), true);
- },
- "span_note" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
- let note_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
- suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), true);
- },
- "help" => {
- let help_snippet = snippet(cx, span_call_args[0].span, r#""...""#);
- suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), false);
- }
- "note" => {
- let note_snippet = snippet(cx, span_call_args[0].span, r#""...""#);
- suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), false);
- }
- _ => (),
- }
- }
- }
- }
- }
-
- struct AndThenSnippets<'a> {
- cx: Cow<'a, str>,
- lint: Cow<'a, str>,
- span: Cow<'a, str>,
- msg: Cow<'a, str>,
- }
-
- fn get_and_then_snippets<'a, 'hir>(cx: &LateContext<'_>, and_then_snippets: &'hir [Expr<'hir>]) -> AndThenSnippets<'a> {
- let cx_snippet = snippet(cx, and_then_snippets[0].span, "cx");
- let lint_snippet = snippet(cx, and_then_snippets[1].span, "..");
- let span_snippet = snippet(cx, and_then_snippets[2].span, "span");
- let msg_snippet = snippet(cx, and_then_snippets[3].span, r#""...""#);
-
- AndThenSnippets {
- cx: cx_snippet,
- lint: lint_snippet,
- span: span_snippet,
- msg: msg_snippet,
- }
- }
-
- struct SpanSuggestionSnippets<'a> {
- help: Cow<'a, str>,
- sugg: Cow<'a, str>,
- applicability: Cow<'a, str>,
- }
-
- fn span_suggestion_snippets<'a, 'hir>(
- cx: &LateContext<'_>,
- span_call_args: &'hir [Expr<'hir>],
- ) -> SpanSuggestionSnippets<'a> {
- let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
- let sugg_snippet = snippet(cx, span_call_args[2].span, "..");
- let applicability_snippet = snippet(cx, span_call_args[3].span, "Applicability::MachineApplicable");
-
- SpanSuggestionSnippets {
- help: help_snippet,
- sugg: sugg_snippet,
- applicability: applicability_snippet,
- }
- }
-
- fn suggest_suggestion(
- cx: &LateContext<'_>,
- expr: &Expr<'_>,
- and_then_snippets: &AndThenSnippets<'_>,
- span_suggestion_snippets: &SpanSuggestionSnippets<'_>,
- ) {
- span_lint_and_sugg(
- cx,
- COLLAPSIBLE_SPAN_LINT_CALLS,
- expr.span,
- "this call is collapsible",
- "collapse into",
- format!(
- "span_lint_and_sugg({}, {}, {}, {}, {}, {}, {})",
- and_then_snippets.cx,
- and_then_snippets.lint,
- and_then_snippets.span,
- and_then_snippets.msg,
- span_suggestion_snippets.help,
- span_suggestion_snippets.sugg,
- span_suggestion_snippets.applicability
- ),
- Applicability::MachineApplicable,
- );
- }
-
- fn suggest_help(
- cx: &LateContext<'_>,
- expr: &Expr<'_>,
- and_then_snippets: &AndThenSnippets<'_>,
- help: &str,
- with_span: bool,
- ) {
- let option_span = if with_span {
- format!("Some({})", and_then_snippets.span)
- } else {
- "None".to_string()
- };
-
- span_lint_and_sugg(
- cx,
- COLLAPSIBLE_SPAN_LINT_CALLS,
- expr.span,
- "this call is collapsible",
- "collapse into",
- format!(
- "span_lint_and_help({}, {}, {}, {}, {}, {help})",
- and_then_snippets.cx, and_then_snippets.lint, and_then_snippets.span, and_then_snippets.msg, &option_span,
- ),
- Applicability::MachineApplicable,
- );
- }
-
- fn suggest_note(
- cx: &LateContext<'_>,
- expr: &Expr<'_>,
- and_then_snippets: &AndThenSnippets<'_>,
- note: &str,
- with_span: bool,
- ) {
- let note_span = if with_span {
- format!("Some({})", and_then_snippets.span)
- } else {
- "None".to_string()
- };
-
- span_lint_and_sugg(
- cx,
- COLLAPSIBLE_SPAN_LINT_CALLS,
- expr.span,
- "this call is collapsible",
- "collapse into",
- format!(
- "span_lint_and_note({}, {}, {}, {}, {note_span}, {note})",
- and_then_snippets.cx, and_then_snippets.lint, and_then_snippets.span, and_then_snippets.msg,
- ),
- Applicability::MachineApplicable,
- );
- }
-
- declare_lint_pass!(UnnecessaryDefPath => [UNNECESSARY_DEF_PATH]);
-
- #[allow(clippy::too_many_lines)]
- impl<'tcx> LateLintPass<'tcx> for UnnecessaryDefPath {
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
- enum Item {
- LangItem(Symbol),
- DiagnosticItem(Symbol),
- }
- static PATHS: &[&[&str]] = &[
- &["clippy_utils", "match_def_path"],
- &["clippy_utils", "match_trait_method"],
- &["clippy_utils", "ty", "match_type"],
- &["clippy_utils", "is_expr_path_def_path"],
- ];
-
- if is_lint_allowed(cx, UNNECESSARY_DEF_PATH, expr.hir_id) {
- return;
- }
-
- if_chain! {
- if let ExprKind::Call(func, [cx_arg, def_arg, args@..]) = expr.kind;
- if let ExprKind::Path(path) = &func.kind;
- if let Some(id) = cx.qpath_res(path, func.hir_id).opt_def_id();
- if let Some(which_path) = match_any_def_paths(cx, id, PATHS);
- let item_arg = if which_path == 4 { &args[1] } else { &args[0] };
- // Extract the path to the matched type
- if let Some(segments) = path_to_matched_type(cx, item_arg);
- let segments: Vec<&str> = segments.iter().map(|sym| &**sym).collect();
- if let Some(def_id) = def_path_res(cx, &segments[..], None).opt_def_id();
- then {
- // def_path_res will match field names before anything else, but for this we want to match
- // inherent functions first.
- let def_id = if cx.tcx.def_kind(def_id) == DefKind::Field {
- let method_name = *segments.last().unwrap();
- cx.tcx.def_key(def_id).parent
- .and_then(|parent_idx|
- cx.tcx.inherent_impls(DefId { index: parent_idx, krate: def_id.krate }).iter()
- .find_map(|impl_id| cx.tcx.associated_items(*impl_id)
- .find_by_name_and_kind(
- cx.tcx,
- Ident::from_str(method_name),
- AssocKind::Fn,
- *impl_id,
- )
- )
- )
- .map_or(def_id, |item| item.def_id)
- } else {
- def_id
- };
-
- // Check if the target item is a diagnostic item or LangItem.
- let (msg, item) = if let Some(item_name)
- = cx.tcx.diagnostic_items(def_id.krate).id_to_name.get(&def_id)
- {
- (
- "use of a def path to a diagnostic item",
- Item::DiagnosticItem(*item_name),
- )
- } else if let Some(lang_item) = cx.tcx.lang_items().items().iter().position(|id| *id == Some(def_id)) {
- let lang_items = def_path_res(cx, &["rustc_hir", "lang_items", "LangItem"], Some(Namespace::TypeNS)).def_id();
- let item_name = cx.tcx.adt_def(lang_items).variants().iter().nth(lang_item).unwrap().name;
- (
- "use of a def path to a `LangItem`",
- Item::LangItem(item_name),
- )
- } else {
- return;
- };
-
- let has_ctor = match cx.tcx.def_kind(def_id) {
- DefKind::Struct => {
- let variant = cx.tcx.adt_def(def_id).non_enum_variant();
- variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
- }
- DefKind::Variant => {
- let variant = cx.tcx.adt_def(cx.tcx.parent(def_id)).variant_with_id(def_id);
- variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
- }
- _ => false,
- };
-
- let mut app = Applicability::MachineApplicable;
- let cx_snip = snippet_with_applicability(cx, cx_arg.span, "..", &mut app);
- let def_snip = snippet_with_applicability(cx, def_arg.span, "..", &mut app);
- let (sugg, with_note) = match (which_path, item) {
- // match_def_path
- (0, Item::DiagnosticItem(item)) =>
- (format!("{cx_snip}.tcx.is_diagnostic_item(sym::{item}, {def_snip})"), has_ctor),
- (0, Item::LangItem(item)) => (
- format!("{cx_snip}.tcx.lang_items().require(LangItem::{item}).ok() == Some({def_snip})"),
- has_ctor
- ),
- // match_trait_method
- (1, Item::DiagnosticItem(item)) =>
- (format!("is_trait_method({cx_snip}, {def_snip}, sym::{item})"), false),
- // match_type
- (2, Item::DiagnosticItem(item)) =>
- (format!("is_type_diagnostic_item({cx_snip}, {def_snip}, sym::{item})"), false),
- (2, Item::LangItem(item)) =>
- (format!("is_type_lang_item({cx_snip}, {def_snip}, LangItem::{item})"), false),
- // is_expr_path_def_path
- (3, Item::DiagnosticItem(item)) if has_ctor => (
- format!(
- "is_res_diag_ctor({cx_snip}, path_res({cx_snip}, {def_snip}), sym::{item})",
- ),
- false,
- ),
- (3, Item::LangItem(item)) if has_ctor => (
- format!(
- "is_res_lang_ctor({cx_snip}, path_res({cx_snip}, {def_snip}), LangItem::{item})",
- ),
- false,
- ),
- (3, Item::DiagnosticItem(item)) =>
- (format!("is_path_diagnostic_item({cx_snip}, {def_snip}, sym::{item})"), false),
- (3, Item::LangItem(item)) => (
- format!(
- "path_res({cx_snip}, {def_snip}).opt_def_id()\
- .map_or(false, |id| {cx_snip}.tcx.lang_items().require(LangItem::{item}).ok() == Some(id))",
- ),
- false,
- ),
- _ => return,
- };
-
- span_lint_and_then(
- cx,
- UNNECESSARY_DEF_PATH,
- expr.span,
- msg,
- |diag| {
- diag.span_suggestion(expr.span, "try", sugg, app);
- if with_note {
- diag.help(
- "if this `DefId` came from a constructor expression or pattern then the \
- parent `DefId` should be used instead"
- );
- }
- },
- );
- }
- }
- }
- }
-
- fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Vec<String>> {
- match peel_hir_expr_refs(expr).0.kind {
- ExprKind::Path(ref qpath) => match cx.qpath_res(qpath, expr.hir_id) {
- Res::Local(hir_id) => {
- let parent_id = cx.tcx.hir().get_parent_node(hir_id);
- if let Some(Node::Local(Local { init: Some(init), .. })) = cx.tcx.hir().find(parent_id) {
- path_to_matched_type(cx, init)
- } else {
- None
- }
- },
- Res::Def(DefKind::Static(_), def_id) => read_mir_alloc_def_path(
- cx,
- cx.tcx.eval_static_initializer(def_id).ok()?.inner(),
- cx.tcx.type_of(def_id),
- ),
- Res::Def(DefKind::Const, def_id) => match cx.tcx.const_eval_poly(def_id).ok()? {
- ConstValue::ByRef { alloc, offset } if offset.bytes() == 0 => {
- read_mir_alloc_def_path(cx, alloc.inner(), cx.tcx.type_of(def_id))
- },
- _ => None,
- },
- _ => None,
- },
- ExprKind::Array(exprs) => exprs
- .iter()
- .map(|expr| {
- if let ExprKind::Lit(lit) = &expr.kind {
- if let LitKind::Str(sym, _) = lit.node {
- return Some((*sym.as_str()).to_owned());
- }
- }
-
- None
- })
- .collect(),
- _ => None,
- }
- }
-
- fn read_mir_alloc_def_path<'tcx>(cx: &LateContext<'tcx>, alloc: &'tcx Allocation, ty: Ty<'_>) -> Option<Vec<String>> {
- let (alloc, ty) = if let ty::Ref(_, ty, Mutability::Not) = *ty.kind() {
- let &alloc = alloc.provenance().values().next()?;
- if let GlobalAlloc::Memory(alloc) = cx.tcx.global_alloc(alloc) {
- (alloc.inner(), ty)
- } else {
- return None;
- }
- } else {
- (alloc, ty)
- };
-
- if let ty::Array(ty, _) | ty::Slice(ty) = *ty.kind()
- && let ty::Ref(_, ty, Mutability::Not) = *ty.kind()
- && ty.is_str()
- {
- alloc
- .provenance()
- .values()
- .map(|&alloc| {
- if let GlobalAlloc::Memory(alloc) = cx.tcx.global_alloc(alloc) {
- let alloc = alloc.inner();
- str::from_utf8(alloc.inspect_with_uninit_and_ptr_outside_interpreter(0..alloc.len()))
- .ok().map(ToOwned::to_owned)
- } else {
- None
- }
- })
- .collect()
- } else {
- None
- }
- }
-
- // This is not a complete resolver for paths. It works on all the paths currently used in the paths
- // module. That's all it does and all it needs to do.
- pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
- if def_path_res(cx, path, None) != Res::Err {
- return true;
- }
-
- // Some implementations can't be found by `path_to_res`, particularly inherent
- // implementations of native types. Check lang items.
- let path_syms: Vec<_> = path.iter().map(|p| Symbol::intern(p)).collect();
- let lang_items = cx.tcx.lang_items();
- // This list isn't complete, but good enough for our current list of paths.
- let incoherent_impls = [
- SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F32),
- SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F64),
- SimplifiedTypeGen::SliceSimplifiedType,
- SimplifiedTypeGen::StrSimplifiedType,
- ]
- .iter()
- .flat_map(|&ty| cx.tcx.incoherent_impls(ty));
- for item_def_id in lang_items.items().iter().flatten().chain(incoherent_impls) {
- let lang_item_path = cx.get_def_path(*item_def_id);
- if path_syms.starts_with(&lang_item_path) {
- if let [item] = &path_syms[lang_item_path.len()..] {
- if matches!(
- cx.tcx.def_kind(*item_def_id),
- DefKind::Mod | DefKind::Enum | DefKind::Trait
- ) {
- for child in cx.tcx.module_children(*item_def_id) {
- if child.ident.name == *item {
- return true;
- }
- }
- } else {
- for child in cx.tcx.associated_item_def_ids(*item_def_id) {
- if cx.tcx.item_name(*child) == *item {
- return true;
- }
- }
- }
- }
- }
- }
-
- false
- }
-
- declare_lint_pass!(InvalidPaths => [INVALID_PATHS]);
-
- impl<'tcx> LateLintPass<'tcx> for InvalidPaths {
- fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
- let local_def_id = &cx.tcx.parent_module(item.hir_id());
- let mod_name = &cx.tcx.item_name(local_def_id.to_def_id());
- if_chain! {
- if mod_name.as_str() == "paths";
- if let hir::ItemKind::Const(ty, body_id) = item.kind;
- let ty = hir_ty_to_ty(cx.tcx, ty);
- if let ty::Array(el_ty, _) = &ty.kind();
- if let ty::Ref(_, el_ty, _) = &el_ty.kind();
- if el_ty.is_str();
- let body = cx.tcx.hir().body(body_id);
- let typeck_results = cx.tcx.typeck_body(body_id);
- if let Some(Constant::Vec(path)) = constant_simple(cx, typeck_results, body.value);
- let path: Vec<&str> = path.iter().map(|x| {
- if let Constant::Str(s) = x {
- s.as_str()
- } else {
- // We checked the type of the constant above
- unreachable!()
- }
- }).collect();
- if !check_path(cx, &path[..]);
- then {
- span_lint(cx, INVALID_PATHS, item.span, "invalid path");
- }
- }
- }
- }
-
- #[derive(Default)]
- pub struct InterningDefinedSymbol {
- // Maps the symbol value to the constant DefId.
- symbol_map: FxHashMap<u32, DefId>,
- }
-
- impl_lint_pass!(InterningDefinedSymbol => [INTERNING_DEFINED_SYMBOL, UNNECESSARY_SYMBOL_STR]);
-
- impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
- fn check_crate(&mut self, cx: &LateContext<'_>) {
- if !self.symbol_map.is_empty() {
- return;
- }
-
- for &module in &[&paths::KW_MODULE, &paths::SYM_MODULE] {
- if let Some(def_id) = def_path_res(cx, module, None).opt_def_id() {
- for item in cx.tcx.module_children(def_id).iter() {
- if_chain! {
- if let Res::Def(DefKind::Const, item_def_id) = item.res;
- let ty = cx.tcx.type_of(item_def_id);
- if match_type(cx, ty, &paths::SYMBOL);
- if let Ok(ConstValue::Scalar(value)) = cx.tcx.const_eval_poly(item_def_id);
- if let Ok(value) = value.to_u32();
- then {
- self.symbol_map.insert(value, item_def_id);
- }
- }
- }
- }
- }
- }
-
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
- if_chain! {
- if let ExprKind::Call(func, [arg]) = &expr.kind;
- if let ty::FnDef(def_id, _) = cx.typeck_results().expr_ty(func).kind();
- if match_def_path(cx, *def_id, &paths::SYMBOL_INTERN);
- if let Some(Constant::Str(arg)) = constant_simple(cx, cx.typeck_results(), arg);
- let value = Symbol::intern(&arg).as_u32();
- if let Some(&def_id) = self.symbol_map.get(&value);
- then {
- span_lint_and_sugg(
- cx,
- INTERNING_DEFINED_SYMBOL,
- is_expn_of(expr.span, "sym").unwrap_or(expr.span),
- "interning a defined symbol",
- "try",
- cx.tcx.def_path_str(def_id),
- Applicability::MachineApplicable,
- );
- }
- }
- if let ExprKind::Binary(op, left, right) = expr.kind {
- if matches!(op.node, BinOpKind::Eq | BinOpKind::Ne) {
- let data = [
- (left, self.symbol_str_expr(left, cx)),
- (right, self.symbol_str_expr(right, cx)),
- ];
- match data {
- // both operands are a symbol string
- [(_, Some(left)), (_, Some(right))] => {
- span_lint_and_sugg(
- cx,
- UNNECESSARY_SYMBOL_STR,
- expr.span,
- "unnecessary `Symbol` to string conversion",
- "try",
- format!(
- "{} {} {}",
- left.as_symbol_snippet(cx),
- op.node.as_str(),
- right.as_symbol_snippet(cx),
- ),
- Applicability::MachineApplicable,
- );
- },
- // one of the operands is a symbol string
- [(expr, Some(symbol)), _] | [_, (expr, Some(symbol))] => {
- // creating an owned string for comparison
- if matches!(symbol, SymbolStrExpr::Expr { is_to_owned: true, .. }) {
- span_lint_and_sugg(
- cx,
- UNNECESSARY_SYMBOL_STR,
- expr.span,
- "unnecessary string allocation",
- "try",
- format!("{}.as_str()", symbol.as_symbol_snippet(cx)),
- Applicability::MachineApplicable,
- );
- }
- },
- // nothing found
- [(_, None), (_, None)] => {},
- }
- }
- }
- }
- }
-
- impl InterningDefinedSymbol {
- fn symbol_str_expr<'tcx>(&self, expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> Option<SymbolStrExpr<'tcx>> {
- static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR, &paths::TO_STRING_METHOD];
- static SYMBOL_STR_PATHS: &[&[&str]] = &[
- &paths::SYMBOL_AS_STR,
- &paths::SYMBOL_TO_IDENT_STRING,
- &paths::TO_STRING_METHOD,
- ];
- let call = if_chain! {
- if let ExprKind::AddrOf(_, _, e) = expr.kind;
- if let ExprKind::Unary(UnOp::Deref, e) = e.kind;
- then { e } else { expr }
- };
- if_chain! {
- // is a method call
- if let ExprKind::MethodCall(_, item, [], _) = call.kind;
- if let Some(did) = cx.typeck_results().type_dependent_def_id(call.hir_id);
- let ty = cx.typeck_results().expr_ty(item);
- // ...on either an Ident or a Symbol
- if let Some(is_ident) = if match_type(cx, ty, &paths::SYMBOL) {
- Some(false)
- } else if match_type(cx, ty, &paths::IDENT) {
- Some(true)
- } else {
- None
- };
- // ...which converts it to a string
- let paths = if is_ident { IDENT_STR_PATHS } else { SYMBOL_STR_PATHS };
- if let Some(path) = paths.iter().find(|path| match_def_path(cx, did, path));
- then {
- let is_to_owned = path.last().unwrap().ends_with("string");
- return Some(SymbolStrExpr::Expr {
- item,
- is_ident,
- is_to_owned,
- });
- }
- }
- // is a string constant
- if let Some(Constant::Str(s)) = constant_simple(cx, cx.typeck_results(), expr) {
- let value = Symbol::intern(&s).as_u32();
- // ...which matches a symbol constant
- if let Some(&def_id) = self.symbol_map.get(&value) {
- return Some(SymbolStrExpr::Const(def_id));
- }
- }
- None
- }
- }
-
- enum SymbolStrExpr<'tcx> {
- /// a string constant with a corresponding symbol constant
- Const(DefId),
- /// a "symbol to string" expression like `symbol.as_str()`
- Expr {
- /// part that evaluates to `Symbol` or `Ident`
- item: &'tcx Expr<'tcx>,
- is_ident: bool,
- /// whether an owned `String` is created like `to_ident_string()`
- is_to_owned: bool,
- },
- }
-
- impl<'tcx> SymbolStrExpr<'tcx> {
- /// Returns a snippet that evaluates to a `Symbol` and is const if possible
- fn as_symbol_snippet(&self, cx: &LateContext<'_>) -> Cow<'tcx, str> {
- match *self {
- Self::Const(def_id) => cx.tcx.def_path_str(def_id).into(),
- Self::Expr { item, is_ident, .. } => {
- let mut snip = snippet(cx, item.span.source_callsite(), "..");
- if is_ident {
- // get `Ident.name`
- snip.to_mut().push_str(".name");
- }
- snip
- },
- }
- }
- }
-
- declare_lint_pass!(IfChainStyle => [IF_CHAIN_STYLE]);
-
- impl<'tcx> LateLintPass<'tcx> for IfChainStyle {
- fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
- let (local, after, if_chain_span) = if_chain! {
- if let [Stmt { kind: StmtKind::Local(local), .. }, after @ ..] = block.stmts;
- if let Some(if_chain_span) = is_expn_of(block.span, "if_chain");
- then { (local, after, if_chain_span) } else { return }
- };
- if is_first_if_chain_expr(cx, block.hir_id, if_chain_span) {
- span_lint(
- cx,
- IF_CHAIN_STYLE,
- if_chain_local_span(cx, local, if_chain_span),
- "`let` expression should be above the `if_chain!`",
- );
- } else if local.span.ctxt() == block.span.ctxt() && is_if_chain_then(after, block.expr, if_chain_span) {
- span_lint(
- cx,
- IF_CHAIN_STYLE,
- if_chain_local_span(cx, local, if_chain_span),
- "`let` expression should be inside `then { .. }`",
- );
- }
- }
-
- fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
- let (cond, then, els) = if let Some(higher::IfOrIfLet { cond, r#else, then }) = higher::IfOrIfLet::hir(expr) {
- (cond, then, r#else.is_some())
- } else {
- return;
- };
- let then_block = match then.kind {
- ExprKind::Block(block, _) => block,
- _ => return,
- };
- let if_chain_span = is_expn_of(expr.span, "if_chain");
- if !els {
- check_nested_if_chains(cx, expr, then_block, if_chain_span);
- }
- let if_chain_span = match if_chain_span {
- None => return,
- Some(span) => span,
- };
- // check for `if a && b;`
- if_chain! {
- if let ExprKind::Binary(op, _, _) = cond.kind;
- if op.node == BinOpKind::And;
- if cx.sess().source_map().is_multiline(cond.span);
- then {
- span_lint(cx, IF_CHAIN_STYLE, cond.span, "`if a && b;` should be `if a; if b;`");
- }
- }
- if is_first_if_chain_expr(cx, expr.hir_id, if_chain_span)
- && is_if_chain_then(then_block.stmts, then_block.expr, if_chain_span)
- {
- span_lint(cx, IF_CHAIN_STYLE, expr.span, "`if_chain!` only has one `if`");
- }
- }
- }
-
- fn check_nested_if_chains(
- cx: &LateContext<'_>,
- if_expr: &Expr<'_>,
- then_block: &Block<'_>,
- if_chain_span: Option<Span>,
- ) {
- #[rustfmt::skip]
- let (head, tail) = match *then_block {
- Block { stmts, expr: Some(tail), .. } => (stmts, tail),
- Block {
- stmts: &[
- ref head @ ..,
- Stmt { kind: StmtKind::Expr(tail) | StmtKind::Semi(tail), .. }
- ],
- ..
- } => (head, tail),
- _ => return,
- };
- if_chain! {
- if let Some(higher::IfOrIfLet { r#else: None, .. }) = higher::IfOrIfLet::hir(tail);
- let sm = cx.sess().source_map();
- if head
- .iter()
- .all(|stmt| matches!(stmt.kind, StmtKind::Local(..)) && !sm.is_multiline(stmt.span));
- if if_chain_span.is_some() || !is_else_clause(cx.tcx, if_expr);
- then {} else { return }
- }
- let (span, msg) = match (if_chain_span, is_expn_of(tail.span, "if_chain")) {
- (None, Some(_)) => (if_expr.span, "this `if` can be part of the inner `if_chain!`"),
- (Some(_), None) => (tail.span, "this `if` can be part of the outer `if_chain!`"),
- (Some(a), Some(b)) if a != b => (b, "this `if_chain!` can be merged with the outer `if_chain!`"),
- _ => return,
- };
- span_lint_and_then(cx, IF_CHAIN_STYLE, span, msg, |diag| {
- let (span, msg) = match head {
- [] => return,
- [stmt] => (stmt.span, "this `let` statement can also be in the `if_chain!`"),
- [a, .., b] => (
- a.span.to(b.span),
- "these `let` statements can also be in the `if_chain!`",
- ),
- };
- diag.span_help(span, msg);
- });
- }
-
- fn is_first_if_chain_expr(cx: &LateContext<'_>, hir_id: HirId, if_chain_span: Span) -> bool {
- cx.tcx
- .hir()
- .parent_iter(hir_id)
- .find(|(_, node)| {
- #[rustfmt::skip]
- !matches!(node, Node::Expr(Expr { kind: ExprKind::Block(..), .. }) | Node::Stmt(_))
- })
- .map_or(false, |(id, _)| {
- is_expn_of(cx.tcx.hir().span(id), "if_chain") != Some(if_chain_span)
- })
- }
-
- /// Checks a trailing slice of statements and expression of a `Block` to see if they are part
- /// of the `then {..}` portion of an `if_chain!`
- fn is_if_chain_then(stmts: &[Stmt<'_>], expr: Option<&Expr<'_>>, if_chain_span: Span) -> bool {
- let span = if let [stmt, ..] = stmts {
- stmt.span
- } else if let Some(expr) = expr {
- expr.span
- } else {
- // empty `then {}`
- return true;
- };
- is_expn_of(span, "if_chain").map_or(true, |span| span != if_chain_span)
- }
-
- /// Creates a `Span` for `let x = ..;` in an `if_chain!` call.
- fn if_chain_local_span(cx: &LateContext<'_>, local: &Local<'_>, if_chain_span: Span) -> Span {
- let mut span = local.pat.span;
- if let Some(init) = local.init {
- span = span.to(init.span);
- }
- span.adjust(if_chain_span.ctxt().outer_expn());
- let sm = cx.sess().source_map();
- let span = sm.span_extend_to_prev_str(span, "let", false, true).unwrap_or(span);
- let span = sm.span_extend_to_next_char(span, ';', false);
- Span::new(
- span.lo() - BytePos(3),
- span.hi() + BytePos(1),
- span.ctxt(),
- span.parent(),
- )
- }
-
- declare_lint_pass!(MsrvAttrImpl => [MISSING_MSRV_ATTR_IMPL]);
-
- impl LateLintPass<'_> for MsrvAttrImpl {
- fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
- if_chain! {
- if let hir::ItemKind::Impl(hir::Impl {
- of_trait: Some(lint_pass_trait_ref),
- self_ty,
- items,
- ..
- }) = &item.kind;
- if let Some(lint_pass_trait_def_id) = lint_pass_trait_ref.trait_def_id();
- let is_late_pass = match_def_path(cx, lint_pass_trait_def_id, &paths::LATE_LINT_PASS);
- if is_late_pass || match_def_path(cx, lint_pass_trait_def_id, &paths::EARLY_LINT_PASS);
- let self_ty = hir_ty_to_ty(cx.tcx, self_ty);
- if let ty::Adt(self_ty_def, _) = self_ty.kind();
- if self_ty_def.is_struct();
- if self_ty_def.all_fields().any(|f| {
- cx.tcx
- .type_of(f.did)
- .walk()
- .filter(|t| matches!(t.unpack(), GenericArgKind::Type(_)))
- .any(|t| match_type(cx, t.expect_ty(), &paths::RUSTC_VERSION))
- });
- if !items.iter().any(|item| item.ident.name == sym!(enter_lint_attrs));
- then {
- let context = if is_late_pass { "LateContext" } else { "EarlyContext" };
- let lint_pass = if is_late_pass { "LateLintPass" } else { "EarlyLintPass" };
- let span = cx.sess().source_map().span_through_char(item.span, '{');
- span_lint_and_sugg(
- cx,
- MISSING_MSRV_ATTR_IMPL,
- span,
- &format!("`extract_msrv_attr!` macro missing from `{lint_pass}` implementation"),
- &format!("add `extract_msrv_attr!({context})` to the `{lint_pass}` implementation"),
- format!("{}\n extract_msrv_attr!({context});", snippet(cx, span, "..")),
- Applicability::MachineApplicable,
- );
- }
- }
- }
- }
++pub mod msrv_attr_impl;
++pub mod outer_expn_data_pass;
++pub mod produce_ice;
++pub mod unnecessary_def_path;
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint;
++use rustc_ast::ast::{Crate, ItemKind, ModKind};
++use rustc_lint::{EarlyContext, EarlyLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for various things we like to keep tidy in clippy.
++ ///
++ /// ### Why is this bad?
++ /// We like to pretend we're an example of tidy code.
++ ///
++ /// ### Example
++ /// Wrong ordering of the util::paths constants.
++ pub CLIPPY_LINTS_INTERNAL,
++ internal,
++ "various things that will negatively affect your clippy experience"
++}
++
++declare_lint_pass!(ClippyLintsInternal => [CLIPPY_LINTS_INTERNAL]);
++
++impl EarlyLintPass for ClippyLintsInternal {
++ fn check_crate(&mut self, cx: &EarlyContext<'_>, krate: &Crate) {
++ if let Some(utils) = krate.items.iter().find(|item| item.ident.name.as_str() == "utils") {
++ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = utils.kind {
++ if let Some(paths) = items.iter().find(|item| item.ident.name.as_str() == "paths") {
++ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = paths.kind {
++ let mut last_name: Option<&str> = None;
++ for item in items {
++ let name = item.ident.as_str();
++ if let Some(last_name) = last_name {
++ if *last_name > *name {
++ span_lint(
++ cx,
++ CLIPPY_LINTS_INTERNAL,
++ item.span,
++ "this constant should be before the previous constant due to lexical \
++ ordering",
++ );
++ }
++ }
++ last_name = Some(name);
++ }
++ }
++ }
++ }
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::source::snippet;
++use clippy_utils::{is_expr_path_def_path, is_lint_allowed, peel_blocks_with_stmt, SpanlessEq};
++use if_chain::if_chain;
++use rustc_errors::Applicability;
++use rustc_hir as hir;
++use rustc_hir::{Closure, Expr, ExprKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++
++use std::borrow::{Borrow, Cow};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Lints `span_lint_and_then` function calls, where the
++ /// closure argument has only one statement and that statement is a method
++ /// call to `span_suggestion`, `span_help`, `span_note` (using the same
++ /// span), `help` or `note`.
++ ///
++ /// These usages of `span_lint_and_then` should be replaced with one of the
++ /// wrapper functions `span_lint_and_sugg`, span_lint_and_help`, or
++ /// `span_lint_and_note`.
++ ///
++ /// ### Why is this bad?
++ /// Using the wrapper `span_lint_and_*` functions, is more
++ /// convenient, readable and less error prone.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
++ /// diag.span_suggestion(
++ /// expr.span,
++ /// help_msg,
++ /// sugg.to_string(),
++ /// Applicability::MachineApplicable,
++ /// );
++ /// });
++ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
++ /// diag.span_help(expr.span, help_msg);
++ /// });
++ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
++ /// diag.help(help_msg);
++ /// });
++ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
++ /// diag.span_note(expr.span, note_msg);
++ /// });
++ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
++ /// diag.note(note_msg);
++ /// });
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// span_lint_and_sugg(
++ /// cx,
++ /// TEST_LINT,
++ /// expr.span,
++ /// lint_msg,
++ /// help_msg,
++ /// sugg.to_string(),
++ /// Applicability::MachineApplicable,
++ /// );
++ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), help_msg);
++ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, None, help_msg);
++ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), note_msg);
++ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, None, note_msg);
++ /// ```
++ pub COLLAPSIBLE_SPAN_LINT_CALLS,
++ internal,
++ "found collapsible `span_lint_and_then` calls"
++}
++
++declare_lint_pass!(CollapsibleCalls => [COLLAPSIBLE_SPAN_LINT_CALLS]);
++
++impl<'tcx> LateLintPass<'tcx> for CollapsibleCalls {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ if is_lint_allowed(cx, COLLAPSIBLE_SPAN_LINT_CALLS, expr.hir_id) {
++ return;
++ }
++
++ if_chain! {
++ if let ExprKind::Call(func, and_then_args) = expr.kind;
++ if is_expr_path_def_path(cx, func, &["clippy_utils", "diagnostics", "span_lint_and_then"]);
++ if and_then_args.len() == 5;
++ if let ExprKind::Closure(&Closure { body, .. }) = &and_then_args[4].kind;
++ let body = cx.tcx.hir().body(body);
++ let only_expr = peel_blocks_with_stmt(body.value);
++ if let ExprKind::MethodCall(ps, recv, span_call_args, _) = &only_expr.kind;
++ if let ExprKind::Path(..) = recv.kind;
++ then {
++ let and_then_snippets = get_and_then_snippets(cx, and_then_args);
++ let mut sle = SpanlessEq::new(cx).deny_side_effects();
++ match ps.ident.as_str() {
++ "span_suggestion" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
++ suggest_suggestion(
++ cx,
++ expr,
++ &and_then_snippets,
++ &span_suggestion_snippets(cx, span_call_args),
++ );
++ },
++ "span_help" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
++ let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
++ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), true);
++ },
++ "span_note" if sle.eq_expr(&and_then_args[2], &span_call_args[0]) => {
++ let note_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
++ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), true);
++ },
++ "help" => {
++ let help_snippet = snippet(cx, span_call_args[0].span, r#""...""#);
++ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), false);
++ },
++ "note" => {
++ let note_snippet = snippet(cx, span_call_args[0].span, r#""...""#);
++ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), false);
++ },
++ _ => (),
++ }
++ }
++ }
++ }
++}
++
++struct AndThenSnippets<'a> {
++ cx: Cow<'a, str>,
++ lint: Cow<'a, str>,
++ span: Cow<'a, str>,
++ msg: Cow<'a, str>,
++}
++
++fn get_and_then_snippets<'a, 'hir>(cx: &LateContext<'_>, and_then_snippets: &'hir [Expr<'hir>]) -> AndThenSnippets<'a> {
++ let cx_snippet = snippet(cx, and_then_snippets[0].span, "cx");
++ let lint_snippet = snippet(cx, and_then_snippets[1].span, "..");
++ let span_snippet = snippet(cx, and_then_snippets[2].span, "span");
++ let msg_snippet = snippet(cx, and_then_snippets[3].span, r#""...""#);
++
++ AndThenSnippets {
++ cx: cx_snippet,
++ lint: lint_snippet,
++ span: span_snippet,
++ msg: msg_snippet,
++ }
++}
++
++struct SpanSuggestionSnippets<'a> {
++ help: Cow<'a, str>,
++ sugg: Cow<'a, str>,
++ applicability: Cow<'a, str>,
++}
++
++fn span_suggestion_snippets<'a, 'hir>(
++ cx: &LateContext<'_>,
++ span_call_args: &'hir [Expr<'hir>],
++) -> SpanSuggestionSnippets<'a> {
++ let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
++ let sugg_snippet = snippet(cx, span_call_args[2].span, "..");
++ let applicability_snippet = snippet(cx, span_call_args[3].span, "Applicability::MachineApplicable");
++
++ SpanSuggestionSnippets {
++ help: help_snippet,
++ sugg: sugg_snippet,
++ applicability: applicability_snippet,
++ }
++}
++
++fn suggest_suggestion(
++ cx: &LateContext<'_>,
++ expr: &Expr<'_>,
++ and_then_snippets: &AndThenSnippets<'_>,
++ span_suggestion_snippets: &SpanSuggestionSnippets<'_>,
++) {
++ span_lint_and_sugg(
++ cx,
++ COLLAPSIBLE_SPAN_LINT_CALLS,
++ expr.span,
++ "this call is collapsible",
++ "collapse into",
++ format!(
++ "span_lint_and_sugg({}, {}, {}, {}, {}, {}, {})",
++ and_then_snippets.cx,
++ and_then_snippets.lint,
++ and_then_snippets.span,
++ and_then_snippets.msg,
++ span_suggestion_snippets.help,
++ span_suggestion_snippets.sugg,
++ span_suggestion_snippets.applicability
++ ),
++ Applicability::MachineApplicable,
++ );
++}
++
++fn suggest_help(
++ cx: &LateContext<'_>,
++ expr: &Expr<'_>,
++ and_then_snippets: &AndThenSnippets<'_>,
++ help: &str,
++ with_span: bool,
++) {
++ let option_span = if with_span {
++ format!("Some({})", and_then_snippets.span)
++ } else {
++ "None".to_string()
++ };
++
++ span_lint_and_sugg(
++ cx,
++ COLLAPSIBLE_SPAN_LINT_CALLS,
++ expr.span,
++ "this call is collapsible",
++ "collapse into",
++ format!(
++ "span_lint_and_help({}, {}, {}, {}, {}, {help})",
++ and_then_snippets.cx, and_then_snippets.lint, and_then_snippets.span, and_then_snippets.msg, &option_span,
++ ),
++ Applicability::MachineApplicable,
++ );
++}
++
++fn suggest_note(
++ cx: &LateContext<'_>,
++ expr: &Expr<'_>,
++ and_then_snippets: &AndThenSnippets<'_>,
++ note: &str,
++ with_span: bool,
++) {
++ let note_span = if with_span {
++ format!("Some({})", and_then_snippets.span)
++ } else {
++ "None".to_string()
++ };
++
++ span_lint_and_sugg(
++ cx,
++ COLLAPSIBLE_SPAN_LINT_CALLS,
++ expr.span,
++ "this call is collapsible",
++ "collapse into",
++ format!(
++ "span_lint_and_note({}, {}, {}, {}, {note_span}, {note})",
++ and_then_snippets.cx, and_then_snippets.lint, and_then_snippets.span, and_then_snippets.msg,
++ ),
++ Applicability::MachineApplicable,
++ );
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_help;
++use clippy_utils::ty::match_type;
++use clippy_utils::{is_lint_allowed, paths};
++use if_chain::if_chain;
++use rustc_data_structures::fx::FxHashMap;
++use rustc_hir::{Expr, ExprKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for calls to `cx.span_lint*` and suggests to use the `utils::*`
++ /// variant of the function.
++ ///
++ /// ### Why is this bad?
++ /// The `utils::*` variants also add a link to the Clippy documentation to the
++ /// warning/error messages.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// cx.span_lint(LINT_NAME, "message");
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// utils::span_lint(cx, LINT_NAME, "message");
++ /// ```
++ pub COMPILER_LINT_FUNCTIONS,
++ internal,
++ "usage of the lint functions of the compiler instead of the utils::* variant"
++}
++
++impl_lint_pass!(CompilerLintFunctions => [COMPILER_LINT_FUNCTIONS]);
++
++#[derive(Clone, Default)]
++pub struct CompilerLintFunctions {
++ map: FxHashMap<&'static str, &'static str>,
++}
++
++impl CompilerLintFunctions {
++ #[must_use]
++ pub fn new() -> Self {
++ let mut map = FxHashMap::default();
++ map.insert("span_lint", "utils::span_lint");
++ map.insert("struct_span_lint", "utils::span_lint");
++ map.insert("lint", "utils::span_lint");
++ map.insert("span_lint_note", "utils::span_lint_and_note");
++ map.insert("span_lint_help", "utils::span_lint_and_help");
++ Self { map }
++ }
++}
++
++impl<'tcx> LateLintPass<'tcx> for CompilerLintFunctions {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
++ if is_lint_allowed(cx, COMPILER_LINT_FUNCTIONS, expr.hir_id) {
++ return;
++ }
++
++ if_chain! {
++ if let ExprKind::MethodCall(path, self_arg, _, _) = &expr.kind;
++ let fn_name = path.ident;
++ if let Some(sugg) = self.map.get(fn_name.as_str());
++ let ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
++ if match_type(cx, ty, &paths::EARLY_CONTEXT) || match_type(cx, ty, &paths::LATE_CONTEXT);
++ then {
++ span_lint_and_help(
++ cx,
++ COMPILER_LINT_FUNCTIONS,
++ path.ident.span,
++ "usage of a compiler lint function",
++ None,
++ &format!("please use the Clippy variant of this function: `{sugg}`"),
++ );
++ }
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
++use clippy_utils::{higher, is_else_clause, is_expn_of};
++use if_chain::if_chain;
++use rustc_hir as hir;
++use rustc_hir::{BinOpKind, Block, Expr, ExprKind, HirId, Local, Node, Stmt, StmtKind};
++use rustc_lint::{LateContext, LateLintPass, LintContext};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::{BytePos, Span};
++
++declare_clippy_lint! {
++ /// Finds unidiomatic usage of `if_chain!`
++ pub IF_CHAIN_STYLE,
++ internal,
++ "non-idiomatic `if_chain!` usage"
++}
++
++declare_lint_pass!(IfChainStyle => [IF_CHAIN_STYLE]);
++
++impl<'tcx> LateLintPass<'tcx> for IfChainStyle {
++ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
++ let (local, after, if_chain_span) = if_chain! {
++ if let [Stmt { kind: StmtKind::Local(local), .. }, after @ ..] = block.stmts;
++ if let Some(if_chain_span) = is_expn_of(block.span, "if_chain");
++ then { (local, after, if_chain_span) } else { return }
++ };
++ if is_first_if_chain_expr(cx, block.hir_id, if_chain_span) {
++ span_lint(
++ cx,
++ IF_CHAIN_STYLE,
++ if_chain_local_span(cx, local, if_chain_span),
++ "`let` expression should be above the `if_chain!`",
++ );
++ } else if local.span.ctxt() == block.span.ctxt() && is_if_chain_then(after, block.expr, if_chain_span) {
++ span_lint(
++ cx,
++ IF_CHAIN_STYLE,
++ if_chain_local_span(cx, local, if_chain_span),
++ "`let` expression should be inside `then { .. }`",
++ );
++ }
++ }
++
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ let (cond, then, els) = if let Some(higher::IfOrIfLet { cond, r#else, then }) = higher::IfOrIfLet::hir(expr) {
++ (cond, then, r#else.is_some())
++ } else {
++ return;
++ };
++ let ExprKind::Block(then_block, _) = then.kind else { return };
++ let if_chain_span = is_expn_of(expr.span, "if_chain");
++ if !els {
++ check_nested_if_chains(cx, expr, then_block, if_chain_span);
++ }
++ let Some(if_chain_span) = if_chain_span else { return };
++ // check for `if a && b;`
++ if_chain! {
++ if let ExprKind::Binary(op, _, _) = cond.kind;
++ if op.node == BinOpKind::And;
++ if cx.sess().source_map().is_multiline(cond.span);
++ then {
++ span_lint(cx, IF_CHAIN_STYLE, cond.span, "`if a && b;` should be `if a; if b;`");
++ }
++ }
++ if is_first_if_chain_expr(cx, expr.hir_id, if_chain_span)
++ && is_if_chain_then(then_block.stmts, then_block.expr, if_chain_span)
++ {
++ span_lint(cx, IF_CHAIN_STYLE, expr.span, "`if_chain!` only has one `if`");
++ }
++ }
++}
++
++fn check_nested_if_chains(
++ cx: &LateContext<'_>,
++ if_expr: &Expr<'_>,
++ then_block: &Block<'_>,
++ if_chain_span: Option<Span>,
++) {
++ #[rustfmt::skip]
++ let (head, tail) = match *then_block {
++ Block { stmts, expr: Some(tail), .. } => (stmts, tail),
++ Block {
++ stmts: &[
++ ref head @ ..,
++ Stmt { kind: StmtKind::Expr(tail) | StmtKind::Semi(tail), .. }
++ ],
++ ..
++ } => (head, tail),
++ _ => return,
++ };
++ if_chain! {
++ if let Some(higher::IfOrIfLet { r#else: None, .. }) = higher::IfOrIfLet::hir(tail);
++ let sm = cx.sess().source_map();
++ if head
++ .iter()
++ .all(|stmt| matches!(stmt.kind, StmtKind::Local(..)) && !sm.is_multiline(stmt.span));
++ if if_chain_span.is_some() || !is_else_clause(cx.tcx, if_expr);
++ then {
++ } else {
++ return;
++ }
++ }
++ let (span, msg) = match (if_chain_span, is_expn_of(tail.span, "if_chain")) {
++ (None, Some(_)) => (if_expr.span, "this `if` can be part of the inner `if_chain!`"),
++ (Some(_), None) => (tail.span, "this `if` can be part of the outer `if_chain!`"),
++ (Some(a), Some(b)) if a != b => (b, "this `if_chain!` can be merged with the outer `if_chain!`"),
++ _ => return,
++ };
++ span_lint_and_then(cx, IF_CHAIN_STYLE, span, msg, |diag| {
++ let (span, msg) = match head {
++ [] => return,
++ [stmt] => (stmt.span, "this `let` statement can also be in the `if_chain!`"),
++ [a, .., b] => (
++ a.span.to(b.span),
++ "these `let` statements can also be in the `if_chain!`",
++ ),
++ };
++ diag.span_help(span, msg);
++ });
++}
++
++fn is_first_if_chain_expr(cx: &LateContext<'_>, hir_id: HirId, if_chain_span: Span) -> bool {
++ cx.tcx
++ .hir()
++ .parent_iter(hir_id)
++ .find(|(_, node)| {
++ #[rustfmt::skip]
++ !matches!(node, Node::Expr(Expr { kind: ExprKind::Block(..), .. }) | Node::Stmt(_))
++ })
++ .map_or(false, |(id, _)| {
++ is_expn_of(cx.tcx.hir().span(id), "if_chain") != Some(if_chain_span)
++ })
++}
++
++/// Checks a trailing slice of statements and expression of a `Block` to see if they are part
++/// of the `then {..}` portion of an `if_chain!`
++fn is_if_chain_then(stmts: &[Stmt<'_>], expr: Option<&Expr<'_>>, if_chain_span: Span) -> bool {
++ let span = if let [stmt, ..] = stmts {
++ stmt.span
++ } else if let Some(expr) = expr {
++ expr.span
++ } else {
++ // empty `then {}`
++ return true;
++ };
++ is_expn_of(span, "if_chain").map_or(true, |span| span != if_chain_span)
++}
++
++/// Creates a `Span` for `let x = ..;` in an `if_chain!` call.
++fn if_chain_local_span(cx: &LateContext<'_>, local: &Local<'_>, if_chain_span: Span) -> Span {
++ let mut span = local.pat.span;
++ if let Some(init) = local.init {
++ span = span.to(init.span);
++ }
++ span.adjust(if_chain_span.ctxt().outer_expn());
++ let sm = cx.sess().source_map();
++ let span = sm.span_extend_to_prev_str(span, "let", false, true).unwrap_or(span);
++ let span = sm.span_extend_to_next_char(span, ';', false);
++ Span::new(
++ span.lo() - BytePos(3),
++ span.hi() + BytePos(1),
++ span.ctxt(),
++ span.parent(),
++ )
++}
--- /dev/null
--- /dev/null
++use clippy_utils::consts::{constant_simple, Constant};
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::source::snippet;
++use clippy_utils::ty::match_type;
++use clippy_utils::{def_path_res, is_expn_of, match_def_path, paths};
++use if_chain::if_chain;
++use rustc_data_structures::fx::FxHashMap;
++use rustc_errors::Applicability;
++use rustc_hir::def::{DefKind, Res};
++use rustc_hir::def_id::DefId;
++use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::mir::interpret::ConstValue;
++use rustc_middle::ty::{self};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::symbol::Symbol;
++
++use std::borrow::Cow;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for interning symbols that have already been pre-interned and defined as constants.
++ ///
++ /// ### Why is this bad?
++ /// It's faster and easier to use the symbol constant.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// let _ = sym!(f32);
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// let _ = sym::f32;
++ /// ```
++ pub INTERNING_DEFINED_SYMBOL,
++ internal,
++ "interning a symbol that is pre-interned and defined as a constant"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for unnecessary conversion from Symbol to a string.
++ ///
++ /// ### Why is this bad?
++ /// It's faster use symbols directly instead of strings.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// symbol.as_str() == "clippy";
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// symbol == sym::clippy;
++ /// ```
++ pub UNNECESSARY_SYMBOL_STR,
++ internal,
++ "unnecessary conversion between Symbol and string"
++}
++
++#[derive(Default)]
++pub struct InterningDefinedSymbol {
++ // Maps the symbol value to the constant DefId.
++ symbol_map: FxHashMap<u32, DefId>,
++}
++
++impl_lint_pass!(InterningDefinedSymbol => [INTERNING_DEFINED_SYMBOL, UNNECESSARY_SYMBOL_STR]);
++
++impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
++ fn check_crate(&mut self, cx: &LateContext<'_>) {
++ if !self.symbol_map.is_empty() {
++ return;
++ }
++
++ for &module in &[&paths::KW_MODULE, &paths::SYM_MODULE] {
++ if let Some(def_id) = def_path_res(cx, module, None).opt_def_id() {
++ for item in cx.tcx.module_children(def_id).iter() {
++ if_chain! {
++ if let Res::Def(DefKind::Const, item_def_id) = item.res;
++ let ty = cx.tcx.type_of(item_def_id);
++ if match_type(cx, ty, &paths::SYMBOL);
++ if let Ok(ConstValue::Scalar(value)) = cx.tcx.const_eval_poly(item_def_id);
++ if let Ok(value) = value.to_u32();
++ then {
++ self.symbol_map.insert(value, item_def_id);
++ }
++ }
++ }
++ }
++ }
++ }
++
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
++ if_chain! {
++ if let ExprKind::Call(func, [arg]) = &expr.kind;
++ if let ty::FnDef(def_id, _) = cx.typeck_results().expr_ty(func).kind();
++ if match_def_path(cx, *def_id, &paths::SYMBOL_INTERN);
++ if let Some(Constant::Str(arg)) = constant_simple(cx, cx.typeck_results(), arg);
++ let value = Symbol::intern(&arg).as_u32();
++ if let Some(&def_id) = self.symbol_map.get(&value);
++ then {
++ span_lint_and_sugg(
++ cx,
++ INTERNING_DEFINED_SYMBOL,
++ is_expn_of(expr.span, "sym").unwrap_or(expr.span),
++ "interning a defined symbol",
++ "try",
++ cx.tcx.def_path_str(def_id),
++ Applicability::MachineApplicable,
++ );
++ }
++ }
++ if let ExprKind::Binary(op, left, right) = expr.kind {
++ if matches!(op.node, BinOpKind::Eq | BinOpKind::Ne) {
++ let data = [
++ (left, self.symbol_str_expr(left, cx)),
++ (right, self.symbol_str_expr(right, cx)),
++ ];
++ match data {
++ // both operands are a symbol string
++ [(_, Some(left)), (_, Some(right))] => {
++ span_lint_and_sugg(
++ cx,
++ UNNECESSARY_SYMBOL_STR,
++ expr.span,
++ "unnecessary `Symbol` to string conversion",
++ "try",
++ format!(
++ "{} {} {}",
++ left.as_symbol_snippet(cx),
++ op.node.as_str(),
++ right.as_symbol_snippet(cx),
++ ),
++ Applicability::MachineApplicable,
++ );
++ },
++ // one of the operands is a symbol string
++ [(expr, Some(symbol)), _] | [_, (expr, Some(symbol))] => {
++ // creating an owned string for comparison
++ if matches!(symbol, SymbolStrExpr::Expr { is_to_owned: true, .. }) {
++ span_lint_and_sugg(
++ cx,
++ UNNECESSARY_SYMBOL_STR,
++ expr.span,
++ "unnecessary string allocation",
++ "try",
++ format!("{}.as_str()", symbol.as_symbol_snippet(cx)),
++ Applicability::MachineApplicable,
++ );
++ }
++ },
++ // nothing found
++ [(_, None), (_, None)] => {},
++ }
++ }
++ }
++ }
++}
++
++impl InterningDefinedSymbol {
++ fn symbol_str_expr<'tcx>(&self, expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> Option<SymbolStrExpr<'tcx>> {
++ static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR, &paths::TO_STRING_METHOD];
++ static SYMBOL_STR_PATHS: &[&[&str]] = &[
++ &paths::SYMBOL_AS_STR,
++ &paths::SYMBOL_TO_IDENT_STRING,
++ &paths::TO_STRING_METHOD,
++ ];
++ let call = if_chain! {
++ if let ExprKind::AddrOf(_, _, e) = expr.kind;
++ if let ExprKind::Unary(UnOp::Deref, e) = e.kind;
++ then { e } else { expr }
++ };
++ if_chain! {
++ // is a method call
++ if let ExprKind::MethodCall(_, item, [], _) = call.kind;
++ if let Some(did) = cx.typeck_results().type_dependent_def_id(call.hir_id);
++ let ty = cx.typeck_results().expr_ty(item);
++ // ...on either an Ident or a Symbol
++ if let Some(is_ident) = if match_type(cx, ty, &paths::SYMBOL) {
++ Some(false)
++ } else if match_type(cx, ty, &paths::IDENT) {
++ Some(true)
++ } else {
++ None
++ };
++ // ...which converts it to a string
++ let paths = if is_ident { IDENT_STR_PATHS } else { SYMBOL_STR_PATHS };
++ if let Some(path) = paths.iter().find(|path| match_def_path(cx, did, path));
++ then {
++ let is_to_owned = path.last().unwrap().ends_with("string");
++ return Some(SymbolStrExpr::Expr {
++ item,
++ is_ident,
++ is_to_owned,
++ });
++ }
++ }
++ // is a string constant
++ if let Some(Constant::Str(s)) = constant_simple(cx, cx.typeck_results(), expr) {
++ let value = Symbol::intern(&s).as_u32();
++ // ...which matches a symbol constant
++ if let Some(&def_id) = self.symbol_map.get(&value) {
++ return Some(SymbolStrExpr::Const(def_id));
++ }
++ }
++ None
++ }
++}
++
++enum SymbolStrExpr<'tcx> {
++ /// a string constant with a corresponding symbol constant
++ Const(DefId),
++ /// a "symbol to string" expression like `symbol.as_str()`
++ Expr {
++ /// part that evaluates to `Symbol` or `Ident`
++ item: &'tcx Expr<'tcx>,
++ is_ident: bool,
++ /// whether an owned `String` is created like `to_ident_string()`
++ is_to_owned: bool,
++ },
++}
++
++impl<'tcx> SymbolStrExpr<'tcx> {
++ /// Returns a snippet that evaluates to a `Symbol` and is const if possible
++ fn as_symbol_snippet(&self, cx: &LateContext<'_>) -> Cow<'tcx, str> {
++ match *self {
++ Self::Const(def_id) => cx.tcx.def_path_str(def_id).into(),
++ Self::Expr { item, is_ident, .. } => {
++ let mut snip = snippet(cx, item.span.source_callsite(), "..");
++ if is_ident {
++ // get `Ident.name`
++ snip.to_mut().push_str(".name");
++ }
++ snip
++ },
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::consts::{constant_simple, Constant};
++use clippy_utils::def_path_res;
++use clippy_utils::diagnostics::span_lint;
++use if_chain::if_chain;
++use rustc_hir as hir;
++use rustc_hir::def::{DefKind, Res};
++use rustc_hir::Item;
++use rustc_hir_analysis::hir_ty_to_ty;
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::ty::{self, fast_reject::SimplifiedTypeGen, FloatTy};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::symbol::Symbol;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks the paths module for invalid paths.
++ ///
++ /// ### Why is this bad?
++ /// It indicates a bug in the code.
++ ///
++ /// ### Example
++ /// None.
++ pub INVALID_PATHS,
++ internal,
++ "invalid path"
++}
++
++declare_lint_pass!(InvalidPaths => [INVALID_PATHS]);
++
++impl<'tcx> LateLintPass<'tcx> for InvalidPaths {
++ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
++ let local_def_id = &cx.tcx.parent_module(item.hir_id());
++ let mod_name = &cx.tcx.item_name(local_def_id.to_def_id());
++ if_chain! {
++ if mod_name.as_str() == "paths";
++ if let hir::ItemKind::Const(ty, body_id) = item.kind;
++ let ty = hir_ty_to_ty(cx.tcx, ty);
++ if let ty::Array(el_ty, _) = &ty.kind();
++ if let ty::Ref(_, el_ty, _) = &el_ty.kind();
++ if el_ty.is_str();
++ let body = cx.tcx.hir().body(body_id);
++ let typeck_results = cx.tcx.typeck_body(body_id);
++ if let Some(Constant::Vec(path)) = constant_simple(cx, typeck_results, body.value);
++ let path: Vec<&str> = path
++ .iter()
++ .map(|x| {
++ if let Constant::Str(s) = x {
++ s.as_str()
++ } else {
++ // We checked the type of the constant above
++ unreachable!()
++ }
++ })
++ .collect();
++ if !check_path(cx, &path[..]);
++ then {
++ span_lint(cx, INVALID_PATHS, item.span, "invalid path");
++ }
++ }
++ }
++}
++
++// This is not a complete resolver for paths. It works on all the paths currently used in the paths
++// module. That's all it does and all it needs to do.
++pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
++ if def_path_res(cx, path, None) != Res::Err {
++ return true;
++ }
++
++ // Some implementations can't be found by `path_to_res`, particularly inherent
++ // implementations of native types. Check lang items.
++ let path_syms: Vec<_> = path.iter().map(|p| Symbol::intern(p)).collect();
++ let lang_items = cx.tcx.lang_items();
++ // This list isn't complete, but good enough for our current list of paths.
++ let incoherent_impls = [
++ SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F32),
++ SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F64),
++ SimplifiedTypeGen::SliceSimplifiedType,
++ SimplifiedTypeGen::StrSimplifiedType,
++ ]
++ .iter()
++ .flat_map(|&ty| cx.tcx.incoherent_impls(ty));
++ for item_def_id in lang_items.items().iter().flatten().chain(incoherent_impls) {
++ let lang_item_path = cx.get_def_path(*item_def_id);
++ if path_syms.starts_with(&lang_item_path) {
++ if let [item] = &path_syms[lang_item_path.len()..] {
++ if matches!(
++ cx.tcx.def_kind(*item_def_id),
++ DefKind::Mod | DefKind::Enum | DefKind::Trait
++ ) {
++ for child in cx.tcx.module_children(*item_def_id) {
++ if child.ident.name == *item {
++ return true;
++ }
++ }
++ } else {
++ for child in cx.tcx.associated_item_def_ids(*item_def_id) {
++ if cx.tcx.item_name(*child) == *item {
++ return true;
++ }
++ }
++ }
++ }
++ }
++ }
++
++ false
++}
--- /dev/null
--- /dev/null
++use crate::utils::internal_lints::metadata_collector::is_deprecated_lint;
++use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
++use clippy_utils::macros::root_macro_call_first_node;
++use clippy_utils::{is_lint_allowed, match_def_path, paths};
++use if_chain::if_chain;
++use rustc_ast as ast;
++use rustc_ast::ast::LitKind;
++use rustc_data_structures::fx::{FxHashMap, FxHashSet};
++use rustc_hir as hir;
++use rustc_hir::def::{DefKind, Res};
++use rustc_hir::hir_id::CRATE_HIR_ID;
++use rustc_hir::intravisit::Visitor;
++use rustc_hir::{ExprKind, HirId, Item, MutTy, Mutability, Path, TyKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::hir::nested_filter;
++use rustc_semver::RustcVersion;
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::source_map::Spanned;
++use rustc_span::symbol::Symbol;
++use rustc_span::{sym, Span};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Ensures every lint is associated to a `LintPass`.
++ ///
++ /// ### Why is this bad?
++ /// The compiler only knows lints via a `LintPass`. Without
++ /// putting a lint to a `LintPass::get_lints()`'s return, the compiler will not
++ /// know the name of the lint.
++ ///
++ /// ### Known problems
++ /// Only checks for lints associated using the
++ /// `declare_lint_pass!`, `impl_lint_pass!`, and `lint_array!` macros.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// declare_lint! { pub LINT_1, ... }
++ /// declare_lint! { pub LINT_2, ... }
++ /// declare_lint! { pub FORGOTTEN_LINT, ... }
++ /// // ...
++ /// declare_lint_pass!(Pass => [LINT_1, LINT_2]);
++ /// // missing FORGOTTEN_LINT
++ /// ```
++ pub LINT_WITHOUT_LINT_PASS,
++ internal,
++ "declaring a lint without associating it in a LintPass"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for cases of an auto-generated lint without an updated description,
++ /// i.e. `default lint description`.
++ ///
++ /// ### Why is this bad?
++ /// Indicates that the lint is not finished.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// declare_lint! { pub COOL_LINT, nursery, "default lint description" }
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// declare_lint! { pub COOL_LINT, nursery, "a great new lint" }
++ /// ```
++ pub DEFAULT_LINT,
++ internal,
++ "found 'default lint description' in a lint declaration"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for invalid `clippy::version` attributes.
++ ///
++ /// Valid values are:
++ /// * "pre 1.29.0"
++ /// * any valid semantic version
++ pub INVALID_CLIPPY_VERSION_ATTRIBUTE,
++ internal,
++ "found an invalid `clippy::version` attribute"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for declared clippy lints without the `clippy::version` attribute.
++ ///
++ pub MISSING_CLIPPY_VERSION_ATTRIBUTE,
++ internal,
++ "found clippy lint without `clippy::version` attribute"
++}
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for cases of an auto-generated deprecated lint without an updated reason,
++ /// i.e. `"default deprecation note"`.
++ ///
++ /// ### Why is this bad?
++ /// Indicates that the documentation is incomplete.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// declare_deprecated_lint! {
++ /// /// ### What it does
++ /// /// Nothing. This lint has been deprecated.
++ /// ///
++ /// /// ### Deprecation reason
++ /// /// TODO
++ /// #[clippy::version = "1.63.0"]
++ /// pub COOL_LINT,
++ /// "default deprecation note"
++ /// }
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// declare_deprecated_lint! {
++ /// /// ### What it does
++ /// /// Nothing. This lint has been deprecated.
++ /// ///
++ /// /// ### Deprecation reason
++ /// /// This lint has been replaced by `cooler_lint`
++ /// #[clippy::version = "1.63.0"]
++ /// pub COOL_LINT,
++ /// "this lint has been replaced by `cooler_lint`"
++ /// }
++ /// ```
++ pub DEFAULT_DEPRECATION_REASON,
++ internal,
++ "found 'default deprecation note' in a deprecated lint declaration"
++}
++
++#[derive(Clone, Debug, Default)]
++pub struct LintWithoutLintPass {
++ declared_lints: FxHashMap<Symbol, Span>,
++ registered_lints: FxHashSet<Symbol>,
++}
++
++impl_lint_pass!(LintWithoutLintPass => [DEFAULT_LINT, LINT_WITHOUT_LINT_PASS, INVALID_CLIPPY_VERSION_ATTRIBUTE, MISSING_CLIPPY_VERSION_ATTRIBUTE, DEFAULT_DEPRECATION_REASON]);
++
++impl<'tcx> LateLintPass<'tcx> for LintWithoutLintPass {
++ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
++ if is_lint_allowed(cx, DEFAULT_LINT, item.hir_id())
++ || is_lint_allowed(cx, DEFAULT_DEPRECATION_REASON, item.hir_id())
++ {
++ return;
++ }
++
++ if let hir::ItemKind::Static(ty, Mutability::Not, body_id) = item.kind {
++ let is_lint_ref_ty = is_lint_ref_type(cx, ty);
++ if is_deprecated_lint(cx, ty) || is_lint_ref_ty {
++ check_invalid_clippy_version_attribute(cx, item);
++
++ let expr = &cx.tcx.hir().body(body_id).value;
++ let fields;
++ if is_lint_ref_ty {
++ if let ExprKind::AddrOf(_, _, inner_exp) = expr.kind
++ && let ExprKind::Struct(_, struct_fields, _) = inner_exp.kind {
++ fields = struct_fields;
++ } else {
++ return;
++ }
++ } else if let ExprKind::Struct(_, struct_fields, _) = expr.kind {
++ fields = struct_fields;
++ } else {
++ return;
++ }
++
++ let field = fields
++ .iter()
++ .find(|f| f.ident.as_str() == "desc")
++ .expect("lints must have a description field");
++
++ if let ExprKind::Lit(Spanned {
++ node: LitKind::Str(ref sym, _),
++ ..
++ }) = field.expr.kind
++ {
++ let sym_str = sym.as_str();
++ if is_lint_ref_ty {
++ if sym_str == "default lint description" {
++ span_lint(
++ cx,
++ DEFAULT_LINT,
++ item.span,
++ &format!("the lint `{}` has the default lint description", item.ident.name),
++ );
++ }
++
++ self.declared_lints.insert(item.ident.name, item.span);
++ } else if sym_str == "default deprecation note" {
++ span_lint(
++ cx,
++ DEFAULT_DEPRECATION_REASON,
++ item.span,
++ &format!("the lint `{}` has the default deprecation reason", item.ident.name),
++ );
++ }
++ }
++ }
++ } else if let Some(macro_call) = root_macro_call_first_node(cx, item) {
++ if !matches!(
++ cx.tcx.item_name(macro_call.def_id).as_str(),
++ "impl_lint_pass" | "declare_lint_pass"
++ ) {
++ return;
++ }
++ if let hir::ItemKind::Impl(hir::Impl {
++ of_trait: None,
++ items: impl_item_refs,
++ ..
++ }) = item.kind
++ {
++ let mut collector = LintCollector {
++ output: &mut self.registered_lints,
++ cx,
++ };
++ let body_id = cx.tcx.hir().body_owned_by(
++ cx.tcx.hir().local_def_id(
++ impl_item_refs
++ .iter()
++ .find(|iiref| iiref.ident.as_str() == "get_lints")
++ .expect("LintPass needs to implement get_lints")
++ .id
++ .hir_id(),
++ ),
++ );
++ collector.visit_expr(cx.tcx.hir().body(body_id).value);
++ }
++ }
++ }
++
++ fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
++ if is_lint_allowed(cx, LINT_WITHOUT_LINT_PASS, CRATE_HIR_ID) {
++ return;
++ }
++
++ for (lint_name, &lint_span) in &self.declared_lints {
++ // When using the `declare_tool_lint!` macro, the original `lint_span`'s
++ // file points to "<rustc macros>".
++ // `compiletest-rs` thinks that's an error in a different file and
++ // just ignores it. This causes the test in compile-fail/lint_pass
++ // not able to capture the error.
++ // Therefore, we need to climb the macro expansion tree and find the
++ // actual span that invoked `declare_tool_lint!`:
++ let lint_span = lint_span.ctxt().outer_expn_data().call_site;
++
++ if !self.registered_lints.contains(lint_name) {
++ span_lint(
++ cx,
++ LINT_WITHOUT_LINT_PASS,
++ lint_span,
++ &format!("the lint `{lint_name}` is not added to any `LintPass`"),
++ );
++ }
++ }
++ }
++}
++
++pub(super) fn is_lint_ref_type<'tcx>(cx: &LateContext<'tcx>, ty: &hir::Ty<'_>) -> bool {
++ if let TyKind::Rptr(
++ _,
++ MutTy {
++ ty: inner,
++ mutbl: Mutability::Not,
++ },
++ ) = ty.kind
++ {
++ if let TyKind::Path(ref path) = inner.kind {
++ if let Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, inner.hir_id) {
++ return match_def_path(cx, def_id, &paths::LINT);
++ }
++ }
++ }
++
++ false
++}
++
++fn check_invalid_clippy_version_attribute(cx: &LateContext<'_>, item: &'_ Item<'_>) {
++ if let Some(value) = extract_clippy_version_value(cx, item) {
++ // The `sym!` macro doesn't work as it only expects a single token.
++ // It's better to keep it this way and have a direct `Symbol::intern` call here.
++ if value == Symbol::intern("pre 1.29.0") {
++ return;
++ }
++
++ if RustcVersion::parse(value.as_str()).is_err() {
++ span_lint_and_help(
++ cx,
++ INVALID_CLIPPY_VERSION_ATTRIBUTE,
++ item.span,
++ "this item has an invalid `clippy::version` attribute",
++ None,
++ "please use a valid semantic version, see `doc/adding_lints.md`",
++ );
++ }
++ } else {
++ span_lint_and_help(
++ cx,
++ MISSING_CLIPPY_VERSION_ATTRIBUTE,
++ item.span,
++ "this lint is missing the `clippy::version` attribute or version value",
++ None,
++ "please use a `clippy::version` attribute, see `doc/adding_lints.md`",
++ );
++ }
++}
++
++/// This function extracts the version value of a `clippy::version` attribute if the given value has
++/// one
++pub(super) fn extract_clippy_version_value(cx: &LateContext<'_>, item: &'_ Item<'_>) -> Option<Symbol> {
++ let attrs = cx.tcx.hir().attrs(item.hir_id());
++ attrs.iter().find_map(|attr| {
++ if_chain! {
++ // Identify attribute
++ if let ast::AttrKind::Normal(ref attr_kind) = &attr.kind;
++ if let [tool_name, attr_name] = &attr_kind.item.path.segments[..];
++ if tool_name.ident.name == sym::clippy;
++ if attr_name.ident.name == sym::version;
++ if let Some(version) = attr.value_str();
++ then { Some(version) } else { None }
++ }
++ })
++}
++
++struct LintCollector<'a, 'tcx> {
++ output: &'a mut FxHashSet<Symbol>,
++ cx: &'a LateContext<'tcx>,
++}
++
++impl<'a, 'tcx> Visitor<'tcx> for LintCollector<'a, 'tcx> {
++ type NestedFilter = nested_filter::All;
++
++ fn visit_path(&mut self, path: &'tcx Path<'_>, _: HirId) {
++ if path.segments.len() == 1 {
++ self.output.insert(path.segments[0].ident.name);
++ }
++ }
++
++ fn nested_visit_map(&mut self) -> Self::Map {
++ self.cx.tcx.hir()
++ }
++}
--- /dev/null
- use crate::utils::internal_lints::{extract_clippy_version_value, is_lint_ref_type};
+//! This lint is used to collect metadata about clippy lints. This metadata is exported as a json
+//! file and then used to generate the [clippy lint list](https://rust-lang.github.io/rust-clippy/master/index.html)
+//!
+//! This module and therefore the entire lint is guarded by a feature flag called `internal`
+//!
+//! The module transforms all lint names to ascii lowercase to ensure that we don't have mismatches
+//! during any comparison or mapping. (Please take care of this, it's not fun to spend time on such
+//! a simple mistake)
+
+use crate::renamed_lints::RENAMED_LINTS;
- let lints: Vec<String> = doc_comment.split_off(DOC_START.len()).split(", ").map(str::to_string).collect();
++use crate::utils::internal_lints::lint_without_lint_pass::{extract_clippy_version_value, is_lint_ref_type};
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::{match_type, walk_ptrs_ty_depth};
+use clippy_utils::{last_path_segment, match_def_path, match_function_call, match_path, paths};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::{
+ self as hir, def::DefKind, intravisit, intravisit::Visitor, Closure, ExprKind, Item, ItemKind, Mutability, QPath,
+};
+use rustc_lint::{CheckLintNameResult, LateContext, LateLintPass, LintContext, LintId};
+use rustc_middle::hir::nested_filter;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Loc, Span, Symbol};
+use serde::{ser::SerializeStruct, Serialize, Serializer};
+use std::collections::BinaryHeap;
+use std::fmt;
+use std::fmt::Write as _;
+use std::fs::{self, OpenOptions};
+use std::io::prelude::*;
+use std::path::Path;
+use std::path::PathBuf;
+use std::process::Command;
+
+/// This is the output file of the lint collector.
+const OUTPUT_FILE: &str = "../util/gh-pages/lints.json";
+/// These lints are excluded from the export.
+const BLACK_LISTED_LINTS: &[&str] = &["lint_author", "dump_hir", "internal_metadata_collector"];
+/// These groups will be ignored by the lint group matcher. This is useful for collections like
+/// `clippy::all`
+const IGNORED_LINT_GROUPS: [&str; 1] = ["clippy::all"];
+/// Lints within this group will be excluded from the collection. These groups
+/// have to be defined without the `clippy::` prefix.
+const EXCLUDED_LINT_GROUPS: [&str; 1] = ["internal"];
+/// Collected deprecated lint will be assigned to this group in the JSON output
+const DEPRECATED_LINT_GROUP_STR: &str = "deprecated";
+/// This is the lint level for deprecated lints that will be displayed in the lint list
+const DEPRECATED_LINT_LEVEL: &str = "none";
+/// This array holds Clippy's lint groups with their corresponding default lint level. The
+/// lint level for deprecated lints is set in `DEPRECATED_LINT_LEVEL`.
+const DEFAULT_LINT_LEVELS: &[(&str, &str)] = &[
+ ("correctness", "deny"),
+ ("suspicious", "warn"),
+ ("restriction", "allow"),
+ ("style", "warn"),
+ ("pedantic", "allow"),
+ ("complexity", "warn"),
+ ("perf", "warn"),
+ ("cargo", "allow"),
+ ("nursery", "allow"),
+];
+/// This prefix is in front of the lint groups in the lint store. The prefix will be trimmed
+/// to only keep the actual lint group in the output.
+const CLIPPY_LINT_GROUP_PREFIX: &str = "clippy::";
+const LINT_EMISSION_FUNCTIONS: [&[&str]; 7] = [
+ &["clippy_utils", "diagnostics", "span_lint"],
+ &["clippy_utils", "diagnostics", "span_lint_and_help"],
+ &["clippy_utils", "diagnostics", "span_lint_and_note"],
+ &["clippy_utils", "diagnostics", "span_lint_hir"],
+ &["clippy_utils", "diagnostics", "span_lint_and_sugg"],
+ &["clippy_utils", "diagnostics", "span_lint_and_then"],
+ &["clippy_utils", "diagnostics", "span_lint_hir_and_then"],
+];
+const SUGGESTION_DIAGNOSTIC_BUILDER_METHODS: [(&str, bool); 9] = [
+ ("span_suggestion", false),
+ ("span_suggestion_short", false),
+ ("span_suggestion_verbose", false),
+ ("span_suggestion_hidden", false),
+ ("tool_only_span_suggestion", false),
+ ("multipart_suggestion", true),
+ ("multipart_suggestions", true),
+ ("tool_only_multipart_suggestion", true),
+ ("span_suggestions", true),
+];
+const SUGGESTION_FUNCTIONS: [&[&str]; 2] = [
+ &["clippy_utils", "diagnostics", "multispan_sugg"],
+ &["clippy_utils", "diagnostics", "multispan_sugg_with_applicability"],
+];
+const DEPRECATED_LINT_TYPE: [&str; 3] = ["clippy_lints", "deprecated_lints", "ClippyDeprecatedLint"];
+
+/// The index of the applicability name of `paths::APPLICABILITY_VALUES`
+const APPLICABILITY_NAME_INDEX: usize = 2;
+/// This applicability will be set for unresolved applicability values.
+const APPLICABILITY_UNRESOLVED_STR: &str = "Unresolved";
+/// The version that will be displayed if none has been defined
+const VERSION_DEFAULT_STR: &str = "Unknown";
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Collects metadata about clippy lints for the website.
+ ///
+ /// This lint will be used to report problems of syntax parsing. You should hopefully never
+ /// see this but never say never I guess ^^
+ ///
+ /// ### Why is this bad?
+ /// This is not a bad thing but definitely a hacky way to do it. See
+ /// issue [#4310](https://github.com/rust-lang/rust-clippy/issues/4310) for a discussion
+ /// about the implementation.
+ ///
+ /// ### Known problems
+ /// Hopefully none. It would be pretty uncool to have a problem here :)
+ ///
+ /// ### Example output
+ /// ```json,ignore
+ /// {
+ /// "id": "internal_metadata_collector",
+ /// "id_span": {
+ /// "path": "clippy_lints/src/utils/internal_lints/metadata_collector.rs",
+ /// "line": 1
+ /// },
+ /// "group": "clippy::internal",
+ /// "docs": " ### What it does\nCollects metadata about clippy lints for the website. [...] "
+ /// }
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub INTERNAL_METADATA_COLLECTOR,
+ internal_warn,
+ "A busy bee collection metadata about lints"
+}
+
+impl_lint_pass!(MetadataCollector => [INTERNAL_METADATA_COLLECTOR]);
+
+#[allow(clippy::module_name_repetitions)]
+#[derive(Debug, Clone)]
+pub struct MetadataCollector {
+ /// All collected lints
+ ///
+ /// We use a Heap here to have the lints added in alphabetic order in the export
+ lints: BinaryHeap<LintMetadata>,
+ applicability_info: FxHashMap<String, ApplicabilityInfo>,
+ config: Vec<ClippyConfiguration>,
+ clippy_project_root: PathBuf,
+}
+
+impl MetadataCollector {
+ pub fn new() -> Self {
+ Self {
+ lints: BinaryHeap::<LintMetadata>::default(),
+ applicability_info: FxHashMap::<String, ApplicabilityInfo>::default(),
+ config: collect_configs(),
+ clippy_project_root: std::env::current_dir()
+ .expect("failed to get current dir")
+ .ancestors()
+ .nth(1)
+ .expect("failed to get project root")
+ .to_path_buf(),
+ }
+ }
+
+ fn get_lint_configs(&self, lint_name: &str) -> Option<String> {
+ self.config
+ .iter()
+ .filter(|config| config.lints.iter().any(|lint| lint == lint_name))
+ .map(ToString::to_string)
+ .reduce(|acc, x| acc + &x)
+ .map(|configurations| {
+ format!(
+ r#"
+### Configuration
+This lint has the following configuration variables:
+
+{configurations}
+"#
+ )
+ })
+ }
+}
+
+impl Drop for MetadataCollector {
+ /// You might ask: How hacky is this?
+ /// My answer: YES
+ fn drop(&mut self) {
+ // The metadata collector gets dropped twice, this makes sure that we only write
+ // when the list is full
+ if self.lints.is_empty() {
+ return;
+ }
+
+ let mut applicability_info = std::mem::take(&mut self.applicability_info);
+
+ // Mapping the final data
+ let mut lints = std::mem::take(&mut self.lints).into_sorted_vec();
+ for x in &mut lints {
+ x.applicability = Some(applicability_info.remove(&x.id).unwrap_or_default());
+ replace_produces(&x.id, &mut x.docs, &self.clippy_project_root);
+ }
+
+ collect_renames(&mut lints);
+
+ // Outputting
+ if Path::new(OUTPUT_FILE).exists() {
+ fs::remove_file(OUTPUT_FILE).unwrap();
+ }
+ let mut file = OpenOptions::new().write(true).create(true).open(OUTPUT_FILE).unwrap();
+ writeln!(file, "{}", serde_json::to_string_pretty(&lints).unwrap()).unwrap();
+ }
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct LintMetadata {
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: String,
+ docs: String,
+ version: String,
+ /// This field is only used in the output and will only be
+ /// mapped shortly before the actual output.
+ applicability: Option<ApplicabilityInfo>,
+}
+
+impl LintMetadata {
+ fn new(
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: &'static str,
+ version: String,
+ docs: String,
+ ) -> Self {
+ Self {
+ id,
+ id_span,
+ group,
+ level: level.to_string(),
+ version,
+ docs,
+ applicability: None,
+ }
+ }
+}
+
+fn replace_produces(lint_name: &str, docs: &mut String, clippy_project_root: &Path) {
+ let mut doc_lines = docs.lines().map(ToString::to_string).collect::<Vec<_>>();
+ let mut lines = doc_lines.iter_mut();
+
+ 'outer: loop {
+ // Find the start of the example
+
+ // ```rust
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start().starts_with("```rust") => {
+ if line.contains("ignore") || line.contains("no_run") {
+ // A {{produces}} marker may have been put on a ignored code block by mistake,
+ // just seek to the end of the code block and continue checking.
+ if lines.any(|line| line.trim_start().starts_with("```")) {
+ continue;
+ }
+
+ panic!("lint `{lint_name}` has an unterminated code block")
+ }
+
+ break;
+ },
+ Some(line) if line.trim_start() == "{{produces}}" => {
+ panic!("lint `{lint_name}` has marker {{{{produces}}}} with an ignored or missing code block")
+ },
+ Some(line) => {
+ let line = line.trim();
+ // These are the two most common markers of the corrections section
+ if line.eq_ignore_ascii_case("Use instead:") || line.eq_ignore_ascii_case("Could be written as:") {
+ break 'outer;
+ }
+ },
+ None => break 'outer,
+ }
+ }
+
+ // Collect the example
+ let mut example = Vec::new();
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start() == "```" => break,
+ Some(line) => example.push(line),
+ None => panic!("lint `{lint_name}` has an unterminated code block"),
+ }
+ }
+
+ // Find the {{produces}} and attempt to generate the output
+ loop {
+ match lines.next() {
+ Some(line) if line.is_empty() => {},
+ Some(line) if line.trim() == "{{produces}}" => {
+ let output = get_lint_output(lint_name, &example, clippy_project_root);
+ line.replace_range(
+ ..,
+ &format!(
+ "<details>\
+ <summary>Produces</summary>\n\
+ \n\
+ ```text\n\
+ {output}\n\
+ ```\n\
+ </details>"
+ ),
+ );
+
+ break;
+ },
+ // No {{produces}}, we can move on to the next example
+ Some(_) => break,
+ None => break 'outer,
+ }
+ }
+ }
+
+ *docs = cleanup_docs(&doc_lines);
+}
+
+fn get_lint_output(lint_name: &str, example: &[&mut String], clippy_project_root: &Path) -> String {
+ let dir = tempfile::tempdir().unwrap_or_else(|e| panic!("failed to create temp dir: {e}"));
+ let file = dir.path().join("lint_example.rs");
+
+ let mut source = String::new();
+ let unhidden = example
+ .iter()
+ .map(|line| line.trim_start().strip_prefix("# ").unwrap_or(line));
+
+ // Get any attributes
+ let mut lines = unhidden.peekable();
+ while let Some(line) = lines.peek() {
+ if line.starts_with("#!") {
+ source.push_str(line);
+ source.push('\n');
+ lines.next();
+ } else {
+ break;
+ }
+ }
+
+ let needs_main = !example.iter().any(|line| line.contains("fn main"));
+ if needs_main {
+ source.push_str("fn main() {\n");
+ }
+
+ for line in lines {
+ source.push_str(line);
+ source.push('\n');
+ }
+
+ if needs_main {
+ source.push_str("}\n");
+ }
+
+ if let Err(e) = fs::write(&file, &source) {
+ panic!("failed to write to `{}`: {e}", file.as_path().to_string_lossy());
+ }
+
+ let prefixed_name = format!("{CLIPPY_LINT_GROUP_PREFIX}{lint_name}");
+
+ let mut cmd = Command::new("cargo");
+
+ cmd.current_dir(clippy_project_root)
+ .env("CARGO_INCREMENTAL", "0")
+ .env("CLIPPY_ARGS", "")
+ .env("CLIPPY_DISABLE_DOCS_LINKS", "1")
+ // We need to disable this to enable all lints
+ .env("ENABLE_METADATA_COLLECTION", "0")
+ .args(["run", "--bin", "clippy-driver"])
+ .args(["--target-dir", "./clippy_lints/target"])
+ .args(["--", "--error-format=json"])
+ .args(["--edition", "2021"])
+ .arg("-Cdebuginfo=0")
+ .args(["-A", "clippy::all"])
+ .args(["-W", &prefixed_name])
+ .args(["-L", "./target/debug"])
+ .args(["-Z", "no-codegen"]);
+
+ let output = cmd
+ .arg(file.as_path())
+ .output()
+ .unwrap_or_else(|e| panic!("failed to run `{cmd:?}`: {e}"));
+
+ let tmp_file_path = file.to_string_lossy();
+ let stderr = std::str::from_utf8(&output.stderr).unwrap();
+ let msgs = stderr
+ .lines()
+ .filter(|line| line.starts_with('{'))
+ .map(|line| serde_json::from_str(line).unwrap())
+ .collect::<Vec<serde_json::Value>>();
+
+ let mut rendered = String::new();
+ let iter = msgs
+ .iter()
+ .filter(|msg| matches!(&msg["code"]["code"], serde_json::Value::String(s) if s == &prefixed_name));
+
+ for message in iter {
+ let rendered_part = message["rendered"].as_str().expect("rendered field should exist");
+ rendered.push_str(rendered_part);
+ }
+
+ if rendered.is_empty() {
+ let rendered: Vec<&str> = msgs.iter().filter_map(|msg| msg["rendered"].as_str()).collect();
+ let non_json: Vec<&str> = stderr.lines().filter(|line| !line.starts_with('{')).collect();
+ panic!(
+ "did not find lint `{lint_name}` in output of example, got:\n{}\n{}",
+ non_json.join("\n"),
+ rendered.join("\n")
+ );
+ }
+
+ // The reader doesn't need to see `/tmp/.tmpfiy2Qd/lint_example.rs` :)
+ rendered.trim_end().replace(&*tmp_file_path, "lint_example.rs")
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct SerializableSpan {
+ path: String,
+ line: usize,
+}
+
+impl fmt::Display for SerializableSpan {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}:{}", self.path.rsplit('/').next().unwrap_or_default(), self.line)
+ }
+}
+
+impl SerializableSpan {
+ fn from_item(cx: &LateContext<'_>, item: &Item<'_>) -> Self {
+ Self::from_span(cx, item.ident.span)
+ }
+
+ fn from_span(cx: &LateContext<'_>, span: Span) -> Self {
+ let loc: Loc = cx.sess().source_map().lookup_char_pos(span.lo());
+
+ Self {
+ path: format!("{}", loc.file.name.prefer_remapped()),
+ line: loc.line,
+ }
+ }
+}
+
+#[derive(Debug, Clone, Default, PartialEq, Eq, PartialOrd, Ord)]
+struct ApplicabilityInfo {
+ /// Indicates if any of the lint emissions uses multiple spans. This is related to
+ /// [rustfix#141](https://github.com/rust-lang/rustfix/issues/141) as such suggestions can
+ /// currently not be applied automatically.
+ is_multi_part_suggestion: bool,
+ applicability: Option<usize>,
+}
+
+impl Serialize for ApplicabilityInfo {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: Serializer,
+ {
+ let mut s = serializer.serialize_struct("ApplicabilityInfo", 2)?;
+ s.serialize_field("is_multi_part_suggestion", &self.is_multi_part_suggestion)?;
+ if let Some(index) = self.applicability {
+ s.serialize_field(
+ "applicability",
+ &paths::APPLICABILITY_VALUES[index][APPLICABILITY_NAME_INDEX],
+ )?;
+ } else {
+ s.serialize_field("applicability", APPLICABILITY_UNRESOLVED_STR)?;
+ }
+ s.end()
+ }
+}
+
+// ==================================================================
+// Configuration
+// ==================================================================
+#[derive(Debug, Clone, Default)]
+pub struct ClippyConfiguration {
+ name: String,
+ config_type: &'static str,
+ default: String,
+ lints: Vec<String>,
+ doc: String,
+ #[allow(dead_code)]
+ deprecation_reason: Option<&'static str>,
+}
+
+impl ClippyConfiguration {
+ pub fn new(
+ name: &'static str,
+ config_type: &'static str,
+ default: String,
+ doc_comment: &'static str,
+ deprecation_reason: Option<&'static str>,
+ ) -> Self {
+ let (lints, doc) = parse_config_field_doc(doc_comment)
+ .unwrap_or_else(|| (vec![], "[ERROR] MALFORMED DOC COMMENT".to_string()));
+
+ Self {
+ name: to_kebab(name),
+ lints,
+ doc,
+ config_type,
+ default,
+ deprecation_reason,
+ }
+ }
+}
+
+fn collect_configs() -> Vec<ClippyConfiguration> {
+ crate::utils::conf::metadata::get_configuration_metadata()
+}
+
+/// This parses the field documentation of the config struct.
+///
+/// ```rust, ignore
+/// parse_config_field_doc(cx, "Lint: LINT_NAME_1, LINT_NAME_2. Papa penguin, papa penguin")
+/// ```
+///
+/// Would yield:
+/// ```rust, ignore
+/// Some(["lint_name_1", "lint_name_2"], "Papa penguin, papa penguin")
+/// ```
+fn parse_config_field_doc(doc_comment: &str) -> Option<(Vec<String>, String)> {
+ const DOC_START: &str = " Lint: ";
+ if_chain! {
+ if doc_comment.starts_with(DOC_START);
+ if let Some(split_pos) = doc_comment.find('.');
+ then {
+ let mut doc_comment = doc_comment.to_string();
+ let mut documentation = doc_comment.split_off(split_pos);
+
+ // Extract lints
+ doc_comment.make_ascii_lowercase();
++ let lints: Vec<String> = doc_comment
++ .split_off(DOC_START.len())
++ .split(", ")
++ .map(str::to_string)
++ .collect();
+
+ // Format documentation correctly
+ // split off leading `.` from lint name list and indent for correct formatting
+ documentation = documentation.trim_start_matches('.').trim().replace("\n ", "\n ");
+
+ Some((lints, documentation))
+ } else {
+ None
+ }
+ }
+}
+
+/// Transforms a given `snake_case_string` to a tasty `kebab-case-string`
+fn to_kebab(config_name: &str) -> String {
+ config_name.replace('_', "-")
+}
+
+impl fmt::Display for ClippyConfiguration {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
+ writeln!(
+ f,
+ "* `{}`: `{}`: {} (defaults to `{}`)",
+ self.name, self.config_type, self.doc, self.default
+ )
+ }
+}
+
+// ==================================================================
+// Lint pass
+// ==================================================================
+impl<'hir> LateLintPass<'hir> for MetadataCollector {
+ /// Collecting lint declarations like:
+ /// ```rust, ignore
+ /// declare_clippy_lint! {
+ /// /// ### What it does
+ /// /// Something IDK.
+ /// pub SOME_LINT,
+ /// internal,
+ /// "Who am I?"
+ /// }
+ /// ```
+ fn check_item(&mut self, cx: &LateContext<'hir>, item: &'hir Item<'_>) {
+ if let ItemKind::Static(ty, Mutability::Not, _) = item.kind {
+ // Normal lint
+ if_chain! {
+ // item validation
+ if is_lint_ref_type(cx, ty);
+ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // metadata extraction
+ if let Some((group, level)) = get_lint_group_and_level_or_lint(cx, &lint_name, item);
+ if let Some(mut raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ if let Some(configuration_section) = self.get_lint_configs(&lint_name) {
+ raw_docs.push_str(&configuration_section);
+ }
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ group,
+ level,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+
+ if_chain! {
+ if is_deprecated_lint(cx, ty);
+ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // Metadata the little we can get from a deprecated lint
+ if let Some(raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ DEPRECATED_LINT_GROUP_STR.to_string(),
+ DEPRECATED_LINT_LEVEL,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+ }
+ }
+
+ /// Collecting constant applicability from the actual lint emissions
+ ///
+ /// Example:
+ /// ```rust, ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// SOME_LINT,
+ /// item.span,
+ /// "Le lint message",
+ /// "Here comes help:",
+ /// "#![allow(clippy::all)]",
+ /// Applicability::MachineApplicable, // <-- Extracts this constant value
+ /// );
+ /// ```
+ fn check_expr(&mut self, cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) {
+ if let Some(args) = match_lint_emission(cx, expr) {
+ let emission_info = extract_emission_info(cx, args);
+ if emission_info.is_empty() {
+ // See:
+ // - src/misc.rs:734:9
+ // - src/methods/mod.rs:3545:13
+ // - src/methods/mod.rs:3496:13
+ // We are basically unable to resolve the lint name itself.
+ return;
+ }
+
+ for (lint_name, applicability, is_multi_part) in emission_info {
+ let app_info = self.applicability_info.entry(lint_name).or_default();
+ app_info.applicability = applicability;
+ app_info.is_multi_part_suggestion = is_multi_part;
+ }
+ }
+ }
+}
+
+// ==================================================================
+// Lint definition extraction
+// ==================================================================
+fn sym_to_string(sym: Symbol) -> String {
+ sym.as_str().to_string()
+}
+
+fn extract_attr_docs_or_lint(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ extract_attr_docs(cx, item).or_else(|| {
+ lint_collection_error_item(cx, item, "could not collect the lint documentation");
+ None
+ })
+}
+
+/// This function collects all documentation that has been added to an item using
+/// `#[doc = r""]` attributes. Several attributes are aggravated using line breaks
+///
+/// ```ignore
+/// #[doc = r"Hello world!"]
+/// #[doc = r"=^.^="]
+/// struct SomeItem {}
+/// ```
+///
+/// Would result in `Hello world!\n=^.^=\n`
+fn extract_attr_docs(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let mut lines = attrs.iter().filter_map(ast::Attribute::doc_str);
+
+ if let Some(line) = lines.next() {
+ let raw_docs = lines.fold(String::from(line.as_str()) + "\n", |s, line| s + line.as_str() + "\n");
+ return Some(raw_docs);
+ }
+
+ None
+}
+
+/// This function may modify the doc comment to ensure that the string can be displayed using a
+/// markdown viewer in Clippy's lint list. The following modifications could be applied:
+/// * Removal of leading space after a new line. (Important to display tables)
+/// * Ensures that code blocks only contain language information
+fn cleanup_docs(docs_collection: &Vec<String>) -> String {
+ let mut in_code_block = false;
+ let mut is_code_block_rust = false;
+
+ let mut docs = String::new();
+ for line in docs_collection {
+ // Rustdoc hides code lines starting with `# ` and this removes them from Clippy's lint list :)
+ if is_code_block_rust && line.trim_start().starts_with("# ") {
+ continue;
+ }
+
+ // The line should be represented in the lint list, even if it's just an empty line
+ docs.push('\n');
+ if let Some(info) = line.trim_start().strip_prefix("```") {
+ in_code_block = !in_code_block;
+ is_code_block_rust = false;
+ if in_code_block {
+ let lang = info
+ .trim()
+ .split(',')
+ // remove rustdoc directives
+ .find(|&s| !matches!(s, "" | "ignore" | "no_run" | "should_panic"))
+ // if no language is present, fill in "rust"
+ .unwrap_or("rust");
+ docs.push_str("```");
+ docs.push_str(lang);
+
+ is_code_block_rust = lang == "rust";
+ continue;
+ }
+ }
+ // This removes the leading space that the macro translation introduces
+ if let Some(stripped_doc) = line.strip_prefix(' ') {
+ docs.push_str(stripped_doc);
+ } else if !line.is_empty() {
+ docs.push_str(line);
+ }
+ }
+
+ docs
+}
+
+fn get_lint_version(cx: &LateContext<'_>, item: &Item<'_>) -> String {
+ extract_clippy_version_value(cx, item).map_or_else(
+ || VERSION_DEFAULT_STR.to_string(),
+ |version| version.as_str().to_string(),
+ )
+}
+
+fn get_lint_group_and_level_or_lint(
+ cx: &LateContext<'_>,
+ lint_name: &str,
+ item: &Item<'_>,
+) -> Option<(String, &'static str)> {
+ let result = cx.lint_store.check_lint_name(
+ lint_name,
+ Some(sym::clippy),
+ &std::iter::once(Ident::with_dummy_span(sym::clippy)).collect(),
+ );
+ if let CheckLintNameResult::Tool(Ok(lint_lst)) = result {
+ if let Some(group) = get_lint_group(cx, lint_lst[0]) {
+ if EXCLUDED_LINT_GROUPS.contains(&group.as_str()) {
+ return None;
+ }
+
+ if let Some(level) = get_lint_level_from_group(&group) {
+ Some((group, level))
+ } else {
+ lint_collection_error_item(
+ cx,
+ item,
+ &format!("Unable to determine lint level for found group `{group}`"),
+ );
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to determine lint group");
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to find lint in lint_store");
+ None
+ }
+}
+
+fn get_lint_group(cx: &LateContext<'_>, lint_id: LintId) -> Option<String> {
+ for (group_name, lints, _) in cx.lint_store.get_lint_groups() {
+ if IGNORED_LINT_GROUPS.contains(&group_name) {
+ continue;
+ }
+
+ if lints.iter().any(|group_lint| *group_lint == lint_id) {
+ let group = group_name.strip_prefix(CLIPPY_LINT_GROUP_PREFIX).unwrap_or(group_name);
+ return Some((*group).to_string());
+ }
+ }
+
+ None
+}
+
+fn get_lint_level_from_group(lint_group: &str) -> Option<&'static str> {
+ DEFAULT_LINT_LEVELS
+ .iter()
+ .find_map(|(group_name, group_level)| (*group_name == lint_group).then_some(*group_level))
+}
+
+pub(super) fn is_deprecated_lint(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(ref path) = ty.kind {
+ if let hir::def::Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, ty.hir_id) {
+ return match_def_path(cx, def_id, &DEPRECATED_LINT_TYPE);
+ }
+ }
+
+ false
+}
+
+fn collect_renames(lints: &mut Vec<LintMetadata>) {
+ for lint in lints {
+ let mut collected = String::new();
+ let mut names = vec![lint.id.clone()];
+
+ loop {
+ if let Some(lint_name) = names.pop() {
+ for (k, v) in RENAMED_LINTS {
+ if_chain! {
+ if let Some(name) = v.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ if name == lint_name;
+ if let Some(past_name) = k.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ then {
+ writeln!(collected, "* `{past_name}`").unwrap();
+ names.push(past_name.to_string());
+ }
+ }
+ }
+
+ continue;
+ }
+
+ break;
+ }
+
+ if !collected.is_empty() {
+ write!(
+ &mut lint.docs,
+ r#"
+### Past names
+
+{collected}
+"#
+ )
+ .unwrap();
+ }
+ }
+}
+
+// ==================================================================
+// Lint emission
+// ==================================================================
+fn lint_collection_error_item(cx: &LateContext<'_>, item: &Item<'_>, message: &str) {
+ span_lint(
+ cx,
+ INTERNAL_METADATA_COLLECTOR,
+ item.ident.span,
+ &format!("metadata collection error for `{}`: {message}", item.ident.name),
+ );
+}
+
+// ==================================================================
+// Applicability
+// ==================================================================
+/// This function checks if a given expression is equal to a simple lint emission function call.
+/// It will return the function arguments if the emission matched any function.
+fn match_lint_emission<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) -> Option<&'hir [hir::Expr<'hir>]> {
+ LINT_EMISSION_FUNCTIONS
+ .iter()
+ .find_map(|emission_fn| match_function_call(cx, expr, emission_fn))
+}
+
+fn take_higher_applicability(a: Option<usize>, b: Option<usize>) -> Option<usize> {
+ a.map_or(b, |a| a.max(b.unwrap_or_default()).into())
+}
+
+fn extract_emission_info<'hir>(
+ cx: &LateContext<'hir>,
+ args: &'hir [hir::Expr<'hir>],
+) -> Vec<(String, Option<usize>, bool)> {
+ let mut lints = Vec::new();
+ let mut applicability = None;
+ let mut multi_part = false;
+
+ for arg in args {
+ let (arg_ty, _) = walk_ptrs_ty_depth(cx.typeck_results().expr_ty(arg));
+
+ if match_type(cx, arg_ty, &paths::LINT) {
+ // If we found the lint arg, extract the lint name
+ let mut resolved_lints = resolve_lints(cx, arg);
+ lints.append(&mut resolved_lints);
+ } else if match_type(cx, arg_ty, &paths::APPLICABILITY) {
+ applicability = resolve_applicability(cx, arg);
+ } else if arg_ty.is_closure() {
+ multi_part |= check_is_multi_part(cx, arg);
+ applicability = applicability.or_else(|| resolve_applicability(cx, arg));
+ }
+ }
+
+ lints
+ .into_iter()
+ .map(|lint_name| (lint_name, applicability, multi_part))
+ .collect()
+}
+
+/// Resolves the possible lints that this expression could reference
+fn resolve_lints<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
+ let mut resolver = LintResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.lints
+}
+
+/// This function tries to resolve the linked applicability to the given expression.
+fn resolve_applicability<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
+ let mut resolver = ApplicabilityResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.complete()
+}
+
+fn check_is_multi_part<'hir>(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
+ if let ExprKind::Closure(&Closure { body, .. }) = closure_expr.kind {
+ let mut scanner = IsMultiSpanScanner::new(cx);
+ intravisit::walk_body(&mut scanner, cx.tcx.hir().body(body));
+ return scanner.is_multi_part();
+ } else if let Some(local) = get_parent_local(cx, closure_expr) {
+ if let Some(local_init) = local.init {
+ return check_is_multi_part(cx, local_init);
+ }
+ }
+
+ false
+}
+
+struct LintResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ lints: Vec<String>,
+}
+
+impl<'a, 'hir> LintResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ lints: Vec::<String>::default(),
+ }
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for LintResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ if_chain! {
+ if let ExprKind::Path(qpath) = &expr.kind;
+ if let QPath::Resolved(_, path) = qpath;
+
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+ if match_type(self.cx, expr_ty, &paths::LINT);
+ then {
+ if let hir::def::Res::Def(DefKind::Static(..), _) = path.res {
+ let lint_name = last_path_segment(qpath).ident.name;
+ self.lints.push(sym_to_string(lint_name).to_ascii_lowercase());
+ } else if let Some(local) = get_parent_local(self.cx, expr) {
+ if let Some(local_init) = local.init {
+ intravisit::walk_expr(self, local_init);
+ }
+ }
+ }
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct ApplicabilityResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ /// This is the index of highest `Applicability` for `paths::APPLICABILITY_VALUES`
+ applicability_index: Option<usize>,
+}
+
+impl<'a, 'hir> ApplicabilityResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ applicability_index: None,
+ }
+ }
+
+ fn add_new_index(&mut self, new_index: usize) {
+ self.applicability_index = take_higher_applicability(self.applicability_index, Some(new_index));
+ }
+
+ fn complete(self) -> Option<usize> {
+ self.applicability_index
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_path(&mut self, path: &'hir hir::Path<'hir>, _id: hir::HirId) {
+ for (index, enum_value) in paths::APPLICABILITY_VALUES.iter().enumerate() {
+ if match_path(path, enum_value) {
+ self.add_new_index(index);
+ return;
+ }
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+
+ if_chain! {
+ if match_type(self.cx, expr_ty, &paths::APPLICABILITY);
+ if let Some(local) = get_parent_local(self.cx, expr);
+ if let Some(local_init) = local.init;
+ then {
+ intravisit::walk_expr(self, local_init);
+ }
+ };
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This returns the parent local node if the expression is a reference one
+fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
+ if let ExprKind::Path(QPath::Resolved(_, path)) = expr.kind {
+ if let hir::def::Res::Local(local_hir) = path.res {
+ return get_parent_local_hir_id(cx, local_hir);
+ }
+ }
+
+ None
+}
+
+fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
+ let map = cx.tcx.hir();
+
+ match map.find(map.get_parent_node(hir_id)) {
+ Some(hir::Node::Local(local)) => Some(local),
+ Some(hir::Node::Pat(pattern)) => get_parent_local_hir_id(cx, pattern.hir_id),
+ _ => None,
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct IsMultiSpanScanner<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ suggestion_count: usize,
+}
+
+impl<'a, 'hir> IsMultiSpanScanner<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ suggestion_count: 0,
+ }
+ }
+
+ /// Add a new single expression suggestion to the counter
+ fn add_single_span_suggestion(&mut self) {
+ self.suggestion_count += 1;
+ }
+
+ /// Signals that a suggestion with possible multiple spans was found
+ fn add_multi_part_suggestion(&mut self) {
+ self.suggestion_count += 2;
+ }
+
+ /// Checks if the suggestions include multiple spans
+ fn is_multi_part(&self) -> bool {
+ self.suggestion_count > 1
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ // Early return if the lint is already multi span
+ if self.is_multi_part() {
+ return;
+ }
+
+ match &expr.kind {
+ ExprKind::Call(fn_expr, _args) => {
+ let found_function = SUGGESTION_FUNCTIONS
+ .iter()
+ .any(|func_path| match_function_call(self.cx, fn_expr, func_path).is_some());
+ if found_function {
+ // These functions are all multi part suggestions
+ self.add_single_span_suggestion();
+ }
+ },
+ ExprKind::MethodCall(path, recv, _, _arg_span) => {
+ let (self_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(recv));
+ if match_type(self.cx, self_ty, &paths::DIAGNOSTIC_BUILDER) {
+ let called_method = path.ident.name.as_str().to_string();
+ for (method_name, is_multi_part) in &SUGGESTION_DIAGNOSTIC_BUILDER_METHODS {
+ if *method_name == called_method {
+ if *is_multi_part {
+ self.add_multi_part_suggestion();
+ } else {
+ self.add_single_span_suggestion();
+ }
+ break;
+ }
+ }
+ }
+ },
+ _ => {},
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::source::snippet;
++use clippy_utils::ty::match_type;
++use clippy_utils::{match_def_path, paths};
++use if_chain::if_chain;
++use rustc_errors::Applicability;
++use rustc_hir as hir;
++use rustc_hir_analysis::hir_ty_to_ty;
++use rustc_lint::{LateContext, LateLintPass, LintContext};
++use rustc_middle::ty::{self, subst::GenericArgKind};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Check that the `extract_msrv_attr!` macro is used, when a lint has a MSRV.
++ ///
++ pub MISSING_MSRV_ATTR_IMPL,
++ internal,
++ "checking if all necessary steps were taken when adding a MSRV to a lint"
++}
++
++declare_lint_pass!(MsrvAttrImpl => [MISSING_MSRV_ATTR_IMPL]);
++
++impl LateLintPass<'_> for MsrvAttrImpl {
++ fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
++ if_chain! {
++ if let hir::ItemKind::Impl(hir::Impl {
++ of_trait: Some(lint_pass_trait_ref),
++ self_ty,
++ items,
++ ..
++ }) = &item.kind;
++ if let Some(lint_pass_trait_def_id) = lint_pass_trait_ref.trait_def_id();
++ let is_late_pass = match_def_path(cx, lint_pass_trait_def_id, &paths::LATE_LINT_PASS);
++ if is_late_pass || match_def_path(cx, lint_pass_trait_def_id, &paths::EARLY_LINT_PASS);
++ let self_ty = hir_ty_to_ty(cx.tcx, self_ty);
++ if let ty::Adt(self_ty_def, _) = self_ty.kind();
++ if self_ty_def.is_struct();
++ if self_ty_def.all_fields().any(|f| {
++ cx.tcx
++ .type_of(f.did)
++ .walk()
++ .filter(|t| matches!(t.unpack(), GenericArgKind::Type(_)))
++ .any(|t| match_type(cx, t.expect_ty(), &paths::RUSTC_VERSION))
++ });
++ if !items.iter().any(|item| item.ident.name == sym!(enter_lint_attrs));
++ then {
++ let context = if is_late_pass { "LateContext" } else { "EarlyContext" };
++ let lint_pass = if is_late_pass { "LateLintPass" } else { "EarlyLintPass" };
++ let span = cx.sess().source_map().span_through_char(item.span, '{');
++ span_lint_and_sugg(
++ cx,
++ MISSING_MSRV_ATTR_IMPL,
++ span,
++ &format!("`extract_msrv_attr!` macro missing from `{lint_pass}` implementation"),
++ &format!("add `extract_msrv_attr!({context})` to the `{lint_pass}` implementation"),
++ format!("{}\n extract_msrv_attr!({context});", snippet(cx, span, "..")),
++ Applicability::MachineApplicable,
++ );
++ }
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::ty::match_type;
++use clippy_utils::{is_lint_allowed, method_calls, paths};
++use if_chain::if_chain;
++use rustc_errors::Applicability;
++use rustc_hir as hir;
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::symbol::Symbol;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for calls to `cx.outer().expn_data()` and suggests to use
++ /// the `cx.outer_expn_data()`
++ ///
++ /// ### Why is this bad?
++ /// `cx.outer_expn_data()` is faster and more concise.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// expr.span.ctxt().outer().expn_data()
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// expr.span.ctxt().outer_expn_data()
++ /// ```
++ pub OUTER_EXPN_EXPN_DATA,
++ internal,
++ "using `cx.outer_expn().expn_data()` instead of `cx.outer_expn_data()`"
++}
++
++declare_lint_pass!(OuterExpnDataPass => [OUTER_EXPN_EXPN_DATA]);
++
++impl<'tcx> LateLintPass<'tcx> for OuterExpnDataPass {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ if is_lint_allowed(cx, OUTER_EXPN_EXPN_DATA, expr.hir_id) {
++ return;
++ }
++
++ let (method_names, arg_lists, spans) = method_calls(expr, 2);
++ let method_names: Vec<&str> = method_names.iter().map(Symbol::as_str).collect();
++ if_chain! {
++ if let ["expn_data", "outer_expn"] = method_names.as_slice();
++ let (self_arg, args) = arg_lists[1];
++ if args.is_empty();
++ let self_ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
++ if match_type(cx, self_ty, &paths::SYNTAX_CONTEXT);
++ then {
++ span_lint_and_sugg(
++ cx,
++ OUTER_EXPN_EXPN_DATA,
++ spans[1].with_hi(expr.span.hi()),
++ "usage of `outer_expn().expn_data()`",
++ "try",
++ "outer_expn_data()".to_string(),
++ Applicability::MachineApplicable,
++ );
++ }
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use rustc_ast::ast::NodeId;
++use rustc_ast::visit::FnKind;
++use rustc_lint::{EarlyContext, EarlyLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::Span;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Not an actual lint. This lint is only meant for testing our customized internal compiler
++ /// error message by calling `panic`.
++ ///
++ /// ### Why is this bad?
++ /// ICE in large quantities can damage your teeth
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// 🍦🍦🍦🍦🍦
++ /// ```
++ pub PRODUCE_ICE,
++ internal,
++ "this message should not appear anywhere as we ICE before and don't emit the lint"
++}
++
++declare_lint_pass!(ProduceIce => [PRODUCE_ICE]);
++
++impl EarlyLintPass for ProduceIce {
++ fn check_fn(&mut self, _: &EarlyContext<'_>, fn_kind: FnKind<'_>, _: Span, _: NodeId) {
++ assert!(!is_trigger_fn(fn_kind), "Would you like some help with that?");
++ }
++}
++
++fn is_trigger_fn(fn_kind: FnKind<'_>) -> bool {
++ match fn_kind {
++ FnKind::Fn(_, ident, ..) => ident.name.as_str() == "it_looks_like_you_are_trying_to_kill_clippy",
++ FnKind::Closure(..) => false,
++ }
++}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_then};
++use clippy_utils::source::snippet_with_applicability;
++use clippy_utils::{def_path_res, is_lint_allowed, match_any_def_paths, peel_hir_expr_refs};
++use if_chain::if_chain;
++use rustc_ast::ast::LitKind;
++use rustc_data_structures::fx::FxHashSet;
++use rustc_errors::Applicability;
++use rustc_hir as hir;
++use rustc_hir::def::{DefKind, Namespace, Res};
++use rustc_hir::def_id::DefId;
++use rustc_hir::{Expr, ExprKind, Local, Mutability, Node};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::mir::interpret::{Allocation, ConstValue, GlobalAlloc};
++use rustc_middle::ty::{self, AssocKind, DefIdTree, Ty};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::symbol::{Ident, Symbol};
++use rustc_span::Span;
++
++use std::str;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for usages of def paths when a diagnostic item or a `LangItem` could be used.
++ ///
++ /// ### Why is this bad?
++ /// The path for an item is subject to change and is less efficient to look up than a
++ /// diagnostic item or a `LangItem`.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// utils::match_type(cx, ty, &paths::VEC)
++ /// ```
++ ///
++ /// Use instead:
++ /// ```rust,ignore
++ /// utils::is_type_diagnostic_item(cx, ty, sym::Vec)
++ /// ```
++ pub UNNECESSARY_DEF_PATH,
++ internal,
++ "using a def path when a diagnostic item or a `LangItem` is available"
++}
++
++impl_lint_pass!(UnnecessaryDefPath => [UNNECESSARY_DEF_PATH]);
++
++#[derive(Default)]
++pub struct UnnecessaryDefPath {
++ array_def_ids: FxHashSet<(DefId, Span)>,
++ linted_def_ids: FxHashSet<DefId>,
++}
++
++impl<'tcx> LateLintPass<'tcx> for UnnecessaryDefPath {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ if is_lint_allowed(cx, UNNECESSARY_DEF_PATH, expr.hir_id) {
++ return;
++ }
++
++ match expr.kind {
++ ExprKind::Call(func, args) => self.check_call(cx, func, args, expr.span),
++ ExprKind::Array(elements) => self.check_array(cx, elements, expr.span),
++ _ => {},
++ }
++ }
++
++ fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
++ for &(def_id, span) in &self.array_def_ids {
++ if self.linted_def_ids.contains(&def_id) {
++ continue;
++ }
++
++ let (msg, sugg) = if let Some(sym) = cx.tcx.get_diagnostic_name(def_id) {
++ ("diagnostic item", format!("sym::{sym}"))
++ } else if let Some(sym) = get_lang_item_name(cx, def_id) {
++ ("language item", format!("LangItem::{sym}"))
++ } else {
++ continue;
++ };
++
++ span_lint_and_help(
++ cx,
++ UNNECESSARY_DEF_PATH,
++ span,
++ &format!("hardcoded path to a {msg}"),
++ None,
++ &format!("convert all references to use `{sugg}`"),
++ );
++ }
++ }
++}
++
++impl UnnecessaryDefPath {
++ #[allow(clippy::too_many_lines)]
++ fn check_call(&mut self, cx: &LateContext<'_>, func: &Expr<'_>, args: &[Expr<'_>], span: Span) {
++ enum Item {
++ LangItem(Symbol),
++ DiagnosticItem(Symbol),
++ }
++ static PATHS: &[&[&str]] = &[
++ &["clippy_utils", "match_def_path"],
++ &["clippy_utils", "match_trait_method"],
++ &["clippy_utils", "ty", "match_type"],
++ &["clippy_utils", "is_expr_path_def_path"],
++ ];
++
++ if_chain! {
++ if let [cx_arg, def_arg, args @ ..] = args;
++ if let ExprKind::Path(path) = &func.kind;
++ if let Some(id) = cx.qpath_res(path, func.hir_id).opt_def_id();
++ if let Some(which_path) = match_any_def_paths(cx, id, PATHS);
++ let item_arg = if which_path == 4 { &args[1] } else { &args[0] };
++ // Extract the path to the matched type
++ if let Some(segments) = path_to_matched_type(cx, item_arg);
++ let segments: Vec<&str> = segments.iter().map(|sym| &**sym).collect();
++ if let Some(def_id) = inherent_def_path_res(cx, &segments[..]);
++ then {
++ // Check if the target item is a diagnostic item or LangItem.
++ #[rustfmt::skip]
++ let (msg, item) = if let Some(item_name)
++ = cx.tcx.diagnostic_items(def_id.krate).id_to_name.get(&def_id)
++ {
++ (
++ "use of a def path to a diagnostic item",
++ Item::DiagnosticItem(*item_name),
++ )
++ } else if let Some(item_name) = get_lang_item_name(cx, def_id) {
++ (
++ "use of a def path to a `LangItem`",
++ Item::LangItem(item_name),
++ )
++ } else {
++ return;
++ };
++
++ let has_ctor = match cx.tcx.def_kind(def_id) {
++ DefKind::Struct => {
++ let variant = cx.tcx.adt_def(def_id).non_enum_variant();
++ variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
++ },
++ DefKind::Variant => {
++ let variant = cx.tcx.adt_def(cx.tcx.parent(def_id)).variant_with_id(def_id);
++ variant.ctor_def_id.is_some() && variant.fields.iter().all(|f| f.vis.is_public())
++ },
++ _ => false,
++ };
++
++ let mut app = Applicability::MachineApplicable;
++ let cx_snip = snippet_with_applicability(cx, cx_arg.span, "..", &mut app);
++ let def_snip = snippet_with_applicability(cx, def_arg.span, "..", &mut app);
++ let (sugg, with_note) = match (which_path, item) {
++ // match_def_path
++ (0, Item::DiagnosticItem(item)) => (
++ format!("{cx_snip}.tcx.is_diagnostic_item(sym::{item}, {def_snip})"),
++ has_ctor,
++ ),
++ (0, Item::LangItem(item)) => (
++ format!("{cx_snip}.tcx.lang_items().require(LangItem::{item}).ok() == Some({def_snip})"),
++ has_ctor,
++ ),
++ // match_trait_method
++ (1, Item::DiagnosticItem(item)) => {
++ (format!("is_trait_method({cx_snip}, {def_snip}, sym::{item})"), false)
++ },
++ // match_type
++ (2, Item::DiagnosticItem(item)) => (
++ format!("is_type_diagnostic_item({cx_snip}, {def_snip}, sym::{item})"),
++ false,
++ ),
++ (2, Item::LangItem(item)) => (
++ format!("is_type_lang_item({cx_snip}, {def_snip}, LangItem::{item})"),
++ false,
++ ),
++ // is_expr_path_def_path
++ (3, Item::DiagnosticItem(item)) if has_ctor => (
++ format!("is_res_diag_ctor({cx_snip}, path_res({cx_snip}, {def_snip}), sym::{item})",),
++ false,
++ ),
++ (3, Item::LangItem(item)) if has_ctor => (
++ format!("is_res_lang_ctor({cx_snip}, path_res({cx_snip}, {def_snip}), LangItem::{item})",),
++ false,
++ ),
++ (3, Item::DiagnosticItem(item)) => (
++ format!("is_path_diagnostic_item({cx_snip}, {def_snip}, sym::{item})"),
++ false,
++ ),
++ (3, Item::LangItem(item)) => (
++ format!(
++ "path_res({cx_snip}, {def_snip}).opt_def_id()\
++ .map_or(false, |id| {cx_snip}.tcx.lang_items().require(LangItem::{item}).ok() == Some(id))",
++ ),
++ false,
++ ),
++ _ => return,
++ };
++
++ span_lint_and_then(cx, UNNECESSARY_DEF_PATH, span, msg, |diag| {
++ diag.span_suggestion(span, "try", sugg, app);
++ if with_note {
++ diag.help(
++ "if this `DefId` came from a constructor expression or pattern then the \
++ parent `DefId` should be used instead",
++ );
++ }
++ });
++
++ self.linted_def_ids.insert(def_id);
++ }
++ }
++ }
++
++ fn check_array(&mut self, cx: &LateContext<'_>, elements: &[Expr<'_>], span: Span) {
++ let Some(path) = path_from_array(elements) else { return };
++
++ if let Some(def_id) = inherent_def_path_res(cx, &path.iter().map(AsRef::as_ref).collect::<Vec<_>>()) {
++ self.array_def_ids.insert((def_id, span));
++ }
++ }
++}
++
++fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Vec<String>> {
++ match peel_hir_expr_refs(expr).0.kind {
++ ExprKind::Path(ref qpath) => match cx.qpath_res(qpath, expr.hir_id) {
++ Res::Local(hir_id) => {
++ let parent_id = cx.tcx.hir().get_parent_node(hir_id);
++ if let Some(Node::Local(Local { init: Some(init), .. })) = cx.tcx.hir().find(parent_id) {
++ path_to_matched_type(cx, init)
++ } else {
++ None
++ }
++ },
++ Res::Def(DefKind::Static(_), def_id) => read_mir_alloc_def_path(
++ cx,
++ cx.tcx.eval_static_initializer(def_id).ok()?.inner(),
++ cx.tcx.type_of(def_id),
++ ),
++ Res::Def(DefKind::Const, def_id) => match cx.tcx.const_eval_poly(def_id).ok()? {
++ ConstValue::ByRef { alloc, offset } if offset.bytes() == 0 => {
++ read_mir_alloc_def_path(cx, alloc.inner(), cx.tcx.type_of(def_id))
++ },
++ _ => None,
++ },
++ _ => None,
++ },
++ ExprKind::Array(exprs) => path_from_array(exprs),
++ _ => None,
++ }
++}
++
++fn read_mir_alloc_def_path<'tcx>(cx: &LateContext<'tcx>, alloc: &'tcx Allocation, ty: Ty<'_>) -> Option<Vec<String>> {
++ let (alloc, ty) = if let ty::Ref(_, ty, Mutability::Not) = *ty.kind() {
++ let &alloc = alloc.provenance().values().next()?;
++ if let GlobalAlloc::Memory(alloc) = cx.tcx.global_alloc(alloc) {
++ (alloc.inner(), ty)
++ } else {
++ return None;
++ }
++ } else {
++ (alloc, ty)
++ };
++
++ if let ty::Array(ty, _) | ty::Slice(ty) = *ty.kind()
++ && let ty::Ref(_, ty, Mutability::Not) = *ty.kind()
++ && ty.is_str()
++ {
++ alloc
++ .provenance()
++ .values()
++ .map(|&alloc| {
++ if let GlobalAlloc::Memory(alloc) = cx.tcx.global_alloc(alloc) {
++ let alloc = alloc.inner();
++ str::from_utf8(alloc.inspect_with_uninit_and_ptr_outside_interpreter(0..alloc.len()))
++ .ok().map(ToOwned::to_owned)
++ } else {
++ None
++ }
++ })
++ .collect()
++ } else {
++ None
++ }
++}
++
++fn path_from_array(exprs: &[Expr<'_>]) -> Option<Vec<String>> {
++ exprs
++ .iter()
++ .map(|expr| {
++ if let ExprKind::Lit(lit) = &expr.kind {
++ if let LitKind::Str(sym, _) = lit.node {
++ return Some((*sym.as_str()).to_owned());
++ }
++ }
++
++ None
++ })
++ .collect()
++}
++
++// def_path_res will match field names before anything else, but for this we want to match
++// inherent functions first.
++fn inherent_def_path_res(cx: &LateContext<'_>, segments: &[&str]) -> Option<DefId> {
++ def_path_res(cx, segments, None).opt_def_id().map(|def_id| {
++ if cx.tcx.def_kind(def_id) == DefKind::Field {
++ let method_name = *segments.last().unwrap();
++ cx.tcx
++ .def_key(def_id)
++ .parent
++ .and_then(|parent_idx| {
++ cx.tcx
++ .inherent_impls(DefId {
++ index: parent_idx,
++ krate: def_id.krate,
++ })
++ .iter()
++ .find_map(|impl_id| {
++ cx.tcx.associated_items(*impl_id).find_by_name_and_kind(
++ cx.tcx,
++ Ident::from_str(method_name),
++ AssocKind::Fn,
++ *impl_id,
++ )
++ })
++ })
++ .map_or(def_id, |item| item.def_id)
++ } else {
++ def_id
++ }
++ })
++}
++
++fn get_lang_item_name(cx: &LateContext<'_>, def_id: DefId) -> Option<Symbol> {
++ if let Some(lang_item) = cx.tcx.lang_items().items().iter().position(|id| *id == Some(def_id)) {
++ let lang_items = def_path_res(cx, &["rustc_hir", "lang_items", "LangItem"], Some(Namespace::TypeNS)).def_id();
++ let item_name = cx
++ .tcx
++ .adt_def(lang_items)
++ .variants()
++ .iter()
++ .nth(lang_item)
++ .unwrap()
++ .name;
++ Some(item_name)
++ } else {
++ None
++ }
++}
--- /dev/null
- sess.span_err(attr.span, &format!("`{name}` cannot be an outer attribute"));
+use rustc_ast::ast;
+use rustc_ast::attr;
+use rustc_errors::Applicability;
+use rustc_session::Session;
+use rustc_span::sym;
+use std::str::FromStr;
+
+/// Deprecation status of attributes known by Clippy.
+pub enum DeprecationStatus {
+ /// Attribute is deprecated
+ Deprecated,
+ /// Attribute is deprecated and was replaced by the named attribute
+ Replaced(&'static str),
+ None,
+}
+
+#[rustfmt::skip]
+pub const BUILTIN_ATTRIBUTES: &[(&str, DeprecationStatus)] = &[
+ ("author", DeprecationStatus::None),
+ ("version", DeprecationStatus::None),
+ ("cognitive_complexity", DeprecationStatus::None),
+ ("cyclomatic_complexity", DeprecationStatus::Replaced("cognitive_complexity")),
+ ("dump", DeprecationStatus::None),
+ ("msrv", DeprecationStatus::None),
+ ("has_significant_drop", DeprecationStatus::None),
+];
+
+pub struct LimitStack {
+ stack: Vec<u64>,
+}
+
+impl Drop for LimitStack {
+ fn drop(&mut self) {
+ assert_eq!(self.stack.len(), 1);
+ }
+}
+
+impl LimitStack {
+ #[must_use]
+ pub fn new(limit: u64) -> Self {
+ Self { stack: vec![limit] }
+ }
+ pub fn limit(&self) -> u64 {
+ *self.stack.last().expect("there should always be a value in the stack")
+ }
+ pub fn push_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
+ let stack = &mut self.stack;
+ parse_attrs(sess, attrs, name, |val| stack.push(val));
+ }
+ pub fn pop_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
+ let stack = &mut self.stack;
+ parse_attrs(sess, attrs, name, |val| assert_eq!(stack.pop(), Some(val)));
+ }
+}
+
+pub fn get_attr<'a>(
+ sess: &'a Session,
+ attrs: &'a [ast::Attribute],
+ name: &'static str,
+) -> impl Iterator<Item = &'a ast::Attribute> {
+ attrs.iter().filter(move |attr| {
+ let attr = if let ast::AttrKind::Normal(ref normal) = attr.kind {
+ &normal.item
+ } else {
+ return false;
+ };
+ let attr_segments = &attr.path.segments;
+ if attr_segments.len() == 2 && attr_segments[0].ident.name == sym::clippy {
+ BUILTIN_ATTRIBUTES
+ .iter()
+ .find_map(|&(builtin_name, ref deprecation_status)| {
+ if attr_segments[1].ident.name.as_str() == builtin_name {
+ Some(deprecation_status)
+ } else {
+ None
+ }
+ })
+ .map_or_else(
+ || {
+ sess.span_err(attr_segments[1].ident.span, "usage of unknown attribute");
+ false
+ },
+ |deprecation_status| {
+ let mut diag =
+ sess.struct_span_err(attr_segments[1].ident.span, "usage of deprecated attribute");
+ match *deprecation_status {
+ DeprecationStatus::Deprecated => {
+ diag.emit();
+ false
+ },
+ DeprecationStatus::Replaced(new_name) => {
+ diag.span_suggestion(
+ attr_segments[1].ident.span,
+ "consider using",
+ new_name,
+ Applicability::MachineApplicable,
+ );
+ diag.emit();
+ false
+ },
+ DeprecationStatus::None => {
+ diag.cancel();
+ attr_segments[1].ident.name.as_str() == name
+ },
+ }
+ },
+ )
+ } else {
+ false
+ }
+ })
+}
+
+fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'static str, mut f: F) {
+ for attr in get_attr(sess, attrs, name) {
+ if let Some(ref value) = attr.value_str() {
+ if let Ok(value) = FromStr::from_str(value.as_str()) {
+ f(value);
+ } else {
+ sess.span_err(attr.span, "not a number");
+ }
+ } else {
+ sess.span_err(attr.span, "bad clippy attribute");
+ }
+ }
+}
+
+pub fn get_unique_inner_attr(sess: &Session, attrs: &[ast::Attribute], name: &'static str) -> Option<ast::Attribute> {
+ let mut unique_attr = None;
+ for attr in get_attr(sess, attrs, name) {
+ match attr.style {
+ ast::AttrStyle::Inner if unique_attr.is_none() => unique_attr = Some(attr.clone()),
+ ast::AttrStyle::Inner => {
+ sess.struct_span_err(attr.span, &format!("`{name}` is defined multiple times"))
+ .span_note(unique_attr.as_ref().unwrap().span, "first definition found here")
+ .emit();
+ },
+ ast::AttrStyle::Outer => {
++ sess.span_err(attr.span, format!("`{name}` cannot be an outer attribute"));
+ },
+ }
+ }
+ unique_attr
+}
+
+/// Return true if the attributes contain any of `proc_macro`,
+/// `proc_macro_derive` or `proc_macro_attribute`, false otherwise
+pub fn is_proc_macro(sess: &Session, attrs: &[ast::Attribute]) -> bool {
+ attrs.iter().any(|attr| sess.is_proc_macro_attr(attr))
+}
+
+/// Return true if the attributes contain `#[doc(hidden)]`
+pub fn is_doc_hidden(attrs: &[ast::Attribute]) -> bool {
+ attrs
+ .iter()
+ .filter(|attr| attr.has_name(sym::doc))
+ .filter_map(ast::Attribute::meta_item_list)
+ .any(|l| attr::list_contains_name(&l, sym::hidden))
+}
--- /dev/null
- (&Self::Tuple(ref l), &Self::Tuple(ref r)) | (&Self::Vec(ref l), &Self::Vec(ref r)) => iter::zip(l, r)
- .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
- .find(|r| r.map_or(true, |o| o != Ordering::Equal))
- .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
+#![allow(clippy::float_cmp)]
+
+use crate::{clip, is_direct_expn_of, sext, unsext};
+use if_chain::if_chain;
+use rustc_ast::ast::{self, LitFloatType, LitKind};
+use rustc_data_structures::sync::Lrc;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::mir;
+use rustc_middle::mir::interpret::Scalar;
+use rustc_middle::ty::SubstsRef;
+use rustc_middle::ty::{self, EarlyBinder, FloatTy, ScalarInt, Ty, TyCtxt};
+use rustc_middle::{bug, span_bug};
+use rustc_span::symbol::Symbol;
+use std::cmp::Ordering::{self, Equal};
+use std::hash::{Hash, Hasher};
+use std::iter;
+
+/// A `LitKind`-like enum to fold constant `Expr`s into.
+#[derive(Debug, Clone)]
+pub enum Constant {
+ /// A `String` (e.g., "abc").
+ Str(String),
+ /// A binary string (e.g., `b"abc"`).
+ Binary(Lrc<[u8]>),
+ /// A single `char` (e.g., `'a'`).
+ Char(char),
+ /// An integer's bit representation.
+ Int(u128),
+ /// An `f32`.
+ F32(f32),
+ /// An `f64`.
+ F64(f64),
+ /// `true` or `false`.
+ Bool(bool),
+ /// An array of constants.
+ Vec(Vec<Constant>),
+ /// Also an array, but with only one constant, repeated N times.
+ Repeat(Box<Constant>, u64),
+ /// A tuple of constants.
+ Tuple(Vec<Constant>),
+ /// A raw pointer.
+ RawPtr(u128),
+ /// A reference
+ Ref(Box<Constant>),
+ /// A literal with syntax error.
+ Err,
+}
+
+impl PartialEq for Constant {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (&Self::Str(ref ls), &Self::Str(ref rs)) => ls == rs,
+ (&Self::Binary(ref l), &Self::Binary(ref r)) => l == r,
+ (&Self::Char(l), &Self::Char(r)) => l == r,
+ (&Self::Int(l), &Self::Int(r)) => l == r,
+ (&Self::F64(l), &Self::F64(r)) => {
+ // We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
+ // `Fw32 == Fw64`, so don’t compare them.
+ // `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
+ l.to_bits() == r.to_bits()
+ },
+ (&Self::F32(l), &Self::F32(r)) => {
+ // We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
+ // `Fw32 == Fw64`, so don’t compare them.
+ // `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
+ f64::from(l).to_bits() == f64::from(r).to_bits()
+ },
+ (&Self::Bool(l), &Self::Bool(r)) => l == r,
+ (&Self::Vec(ref l), &Self::Vec(ref r)) | (&Self::Tuple(ref l), &Self::Tuple(ref r)) => l == r,
+ (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
+ (&Self::Ref(ref lb), &Self::Ref(ref rb)) => *lb == *rb,
+ // TODO: are there inter-type equalities?
+ _ => false,
+ }
+ }
+}
+
+impl Hash for Constant {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ std::mem::discriminant(self).hash(state);
+ match *self {
+ Self::Str(ref s) => {
+ s.hash(state);
+ },
+ Self::Binary(ref b) => {
+ b.hash(state);
+ },
+ Self::Char(c) => {
+ c.hash(state);
+ },
+ Self::Int(i) => {
+ i.hash(state);
+ },
+ Self::F32(f) => {
+ f64::from(f).to_bits().hash(state);
+ },
+ Self::F64(f) => {
+ f.to_bits().hash(state);
+ },
+ Self::Bool(b) => {
+ b.hash(state);
+ },
+ Self::Vec(ref v) | Self::Tuple(ref v) => {
+ v.hash(state);
+ },
+ Self::Repeat(ref c, l) => {
+ c.hash(state);
+ l.hash(state);
+ },
+ Self::RawPtr(u) => {
+ u.hash(state);
+ },
+ Self::Ref(ref r) => {
+ r.hash(state);
+ },
+ Self::Err => {},
+ }
+ }
+}
+
+impl Constant {
+ pub fn partial_cmp(tcx: TyCtxt<'_>, cmp_type: Ty<'_>, left: &Self, right: &Self) -> Option<Ordering> {
+ match (left, right) {
+ (&Self::Str(ref ls), &Self::Str(ref rs)) => Some(ls.cmp(rs)),
+ (&Self::Char(ref l), &Self::Char(ref r)) => Some(l.cmp(r)),
+ (&Self::Int(l), &Self::Int(r)) => match *cmp_type.kind() {
+ ty::Int(int_ty) => Some(sext(tcx, l, int_ty).cmp(&sext(tcx, r, int_ty))),
+ ty::Uint(_) => Some(l.cmp(&r)),
+ _ => bug!("Not an int type"),
+ },
+ (&Self::F64(l), &Self::F64(r)) => l.partial_cmp(&r),
+ (&Self::F32(l), &Self::F32(r)) => l.partial_cmp(&r),
+ (&Self::Bool(ref l), &Self::Bool(ref r)) => Some(l.cmp(r)),
- match Self::partial_cmp(tcx, cmp_type, lv, rv) {
++ (&Self::Tuple(ref l), &Self::Tuple(ref r)) if l.len() == r.len() => match *cmp_type.kind() {
++ ty::Tuple(tys) if tys.len() == l.len() => l
++ .iter()
++ .zip(r)
++ .zip(tys)
++ .map(|((li, ri), cmp_type)| Self::partial_cmp(tcx, cmp_type, li, ri))
++ .find(|r| r.map_or(true, |o| o != Ordering::Equal))
++ .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
++ _ => None,
++ },
++ (&Self::Vec(ref l), &Self::Vec(ref r)) => {
++ let cmp_type = match *cmp_type.kind() {
++ ty::Array(ty, _) | ty::Slice(ty) => ty,
++ _ => return None,
++ };
++ iter::zip(l, r)
++ .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
++ .find(|r| r.map_or(true, |o| o != Ordering::Equal))
++ .unwrap_or_else(|| Some(l.len().cmp(&r.len())))
++ },
+ (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => {
- (&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(tcx, cmp_type, lb, rb),
++ match Self::partial_cmp(
++ tcx,
++ match *cmp_type.kind() {
++ ty::Array(ty, _) => ty,
++ _ => return None,
++ },
++ lv,
++ rv,
++ ) {
+ Some(Equal) => Some(ls.cmp(rs)),
+ x => x,
+ }
+ },
++ (&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(
++ tcx,
++ match *cmp_type.kind() {
++ ty::Ref(_, ty, _) => ty,
++ _ => return None,
++ },
++ lb,
++ rb,
++ ),
+ // TODO: are there any useful inter-type orderings?
+ _ => None,
+ }
+ }
+
+ /// Returns the integer value or `None` if `self` or `val_type` is not integer type.
+ pub fn int_value(&self, cx: &LateContext<'_>, val_type: Ty<'_>) -> Option<FullInt> {
+ if let Constant::Int(const_int) = *self {
+ match *val_type.kind() {
+ ty::Int(ity) => Some(FullInt::S(sext(cx.tcx, const_int, ity))),
+ ty::Uint(_) => Some(FullInt::U(const_int)),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ }
+
+ #[must_use]
+ pub fn peel_refs(mut self) -> Self {
+ while let Constant::Ref(r) = self {
+ self = *r;
+ }
+ self
+ }
+}
+
+/// Parses a `LitKind` to a `Constant`.
+pub fn lit_to_mir_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
+ match *lit {
+ LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
+ LitKind::Byte(b) => Constant::Int(u128::from(b)),
+ LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
+ LitKind::Char(c) => Constant::Char(c),
+ LitKind::Int(n, _) => Constant::Int(n),
+ LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
+ ast::FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
+ ast::FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
+ },
+ LitKind::Float(ref is, LitFloatType::Unsuffixed) => match ty.expect("type of float is known").kind() {
+ ty::Float(FloatTy::F32) => Constant::F32(is.as_str().parse().unwrap()),
+ ty::Float(FloatTy::F64) => Constant::F64(is.as_str().parse().unwrap()),
+ _ => bug!(),
+ },
+ LitKind::Bool(b) => Constant::Bool(b),
+ LitKind::Err => Constant::Err,
+ }
+}
+
+pub fn constant<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<(Constant, bool)> {
+ let mut cx = ConstEvalLateContext {
+ lcx,
+ typeck_results,
+ param_env: lcx.param_env,
+ needed_resolution: false,
+ substs: lcx.tcx.intern_substs(&[]),
+ };
+ cx.expr(e).map(|cst| (cst, cx.needed_resolution))
+}
+
+pub fn constant_simple<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<Constant> {
+ constant(lcx, typeck_results, e).and_then(|(cst, res)| if res { None } else { Some(cst) })
+}
+
+pub fn constant_full_int<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<FullInt> {
+ constant_simple(lcx, typeck_results, e)?.int_value(lcx, typeck_results.expr_ty(e))
+}
+
+#[derive(Copy, Clone, Debug, Eq)]
+pub enum FullInt {
+ S(i128),
+ U(u128),
+}
+
+impl PartialEq for FullInt {
+ #[must_use]
+ fn eq(&self, other: &Self) -> bool {
+ self.cmp(other) == Ordering::Equal
+ }
+}
+
+impl PartialOrd for FullInt {
+ #[must_use]
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+impl Ord for FullInt {
+ #[must_use]
+ fn cmp(&self, other: &Self) -> Ordering {
+ use FullInt::{S, U};
+
+ fn cmp_s_u(s: i128, u: u128) -> Ordering {
+ u128::try_from(s).map_or(Ordering::Less, |x| x.cmp(&u))
+ }
+
+ match (*self, *other) {
+ (S(s), S(o)) => s.cmp(&o),
+ (U(s), U(o)) => s.cmp(&o),
+ (S(s), U(o)) => cmp_s_u(s, o),
+ (U(s), S(o)) => cmp_s_u(o, s).reverse(),
+ }
+ }
+}
+
+/// Creates a `ConstEvalLateContext` from the given `LateContext` and `TypeckResults`.
+pub fn constant_context<'a, 'tcx>(
+ lcx: &'a LateContext<'tcx>,
+ typeck_results: &'a ty::TypeckResults<'tcx>,
+) -> ConstEvalLateContext<'a, 'tcx> {
+ ConstEvalLateContext {
+ lcx,
+ typeck_results,
+ param_env: lcx.param_env,
+ needed_resolution: false,
+ substs: lcx.tcx.intern_substs(&[]),
+ }
+}
+
+pub struct ConstEvalLateContext<'a, 'tcx> {
+ lcx: &'a LateContext<'tcx>,
+ typeck_results: &'a ty::TypeckResults<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ needed_resolution: bool,
+ substs: SubstsRef<'tcx>,
+}
+
+impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
+ /// Simple constant folding: Insert an expression, get a constant or none.
+ pub fn expr(&mut self, e: &Expr<'_>) -> Option<Constant> {
+ match e.kind {
+ ExprKind::Path(ref qpath) => self.fetch_path(qpath, e.hir_id, self.typeck_results.expr_ty(e)),
+ ExprKind::Block(block, _) => self.block(block),
+ ExprKind::Lit(ref lit) => {
+ if is_direct_expn_of(e.span, "cfg").is_some() {
+ None
+ } else {
+ Some(lit_to_mir_constant(&lit.node, self.typeck_results.expr_ty_opt(e)))
+ }
+ },
+ ExprKind::Array(vec) => self.multi(vec).map(Constant::Vec),
+ ExprKind::Tup(tup) => self.multi(tup).map(Constant::Tuple),
+ ExprKind::Repeat(value, _) => {
+ let n = match self.typeck_results.expr_ty(e).kind() {
+ ty::Array(_, n) => n.try_eval_usize(self.lcx.tcx, self.lcx.param_env)?,
+ _ => span_bug!(e.span, "typeck error"),
+ };
+ self.expr(value).map(|v| Constant::Repeat(Box::new(v), n))
+ },
+ ExprKind::Unary(op, operand) => self.expr(operand).and_then(|o| match op {
+ UnOp::Not => self.constant_not(&o, self.typeck_results.expr_ty(e)),
+ UnOp::Neg => self.constant_negate(&o, self.typeck_results.expr_ty(e)),
+ UnOp::Deref => Some(if let Constant::Ref(r) = o { *r } else { o }),
+ }),
+ ExprKind::If(cond, then, ref otherwise) => self.ifthenelse(cond, then, *otherwise),
+ ExprKind::Binary(op, left, right) => self.binop(op, left, right),
+ ExprKind::Call(callee, args) => {
+ // We only handle a few const functions for now.
+ if_chain! {
+ if args.is_empty();
+ if let ExprKind::Path(qpath) = &callee.kind;
+ let res = self.typeck_results.qpath_res(qpath, callee.hir_id);
+ if let Some(def_id) = res.opt_def_id();
+ let def_path = self.lcx.get_def_path(def_id);
+ let def_path: Vec<&str> = def_path.iter().take(4).map(Symbol::as_str).collect();
+ if let ["core", "num", int_impl, "max_value"] = *def_path;
+ then {
+ let value = match int_impl {
+ "<impl i8>" => i8::MAX as u128,
+ "<impl i16>" => i16::MAX as u128,
+ "<impl i32>" => i32::MAX as u128,
+ "<impl i64>" => i64::MAX as u128,
+ "<impl i128>" => i128::MAX as u128,
+ _ => return None,
+ };
+ Some(Constant::Int(value))
+ } else {
+ None
+ }
+ }
+ },
+ ExprKind::Index(arr, index) => self.index(arr, index),
+ ExprKind::AddrOf(_, _, inner) => self.expr(inner).map(|r| Constant::Ref(Box::new(r))),
+ // TODO: add other expressions.
+ _ => None,
+ }
+ }
+
+ #[expect(clippy::cast_possible_wrap)]
+ fn constant_not(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
+ use self::Constant::{Bool, Int};
+ match *o {
+ Bool(b) => Some(Bool(!b)),
+ Int(value) => {
+ let value = !value;
+ match *ty.kind() {
+ ty::Int(ity) => Some(Int(unsext(self.lcx.tcx, value as i128, ity))),
+ ty::Uint(ity) => Some(Int(clip(self.lcx.tcx, value, ity))),
+ _ => None,
+ }
+ },
+ _ => None,
+ }
+ }
+
+ fn constant_negate(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
+ use self::Constant::{Int, F32, F64};
+ match *o {
+ Int(value) => {
+ let ity = match *ty.kind() {
+ ty::Int(ity) => ity,
+ _ => return None,
+ };
+ // sign extend
+ let value = sext(self.lcx.tcx, value, ity);
+ let value = value.checked_neg()?;
+ // clear unused bits
+ Some(Int(unsext(self.lcx.tcx, value, ity)))
+ },
+ F32(f) => Some(F32(-f)),
+ F64(f) => Some(F64(-f)),
+ _ => None,
+ }
+ }
+
+ /// Create `Some(Vec![..])` of all constants, unless there is any
+ /// non-constant part.
+ fn multi(&mut self, vec: &[Expr<'_>]) -> Option<Vec<Constant>> {
+ vec.iter().map(|elem| self.expr(elem)).collect::<Option<_>>()
+ }
+
+ /// Lookup a possibly constant expression from an `ExprKind::Path`.
+ fn fetch_path(&mut self, qpath: &QPath<'_>, id: HirId, ty: Ty<'tcx>) -> Option<Constant> {
+ let res = self.typeck_results.qpath_res(qpath, id);
+ match res {
+ Res::Def(DefKind::Const | DefKind::AssocConst, def_id) => {
+ // Check if this constant is based on `cfg!(..)`,
+ // which is NOT constant for our purposes.
+ if let Some(node) = self.lcx.tcx.hir().get_if_local(def_id) &&
+ let Node::Item(&Item {
+ kind: ItemKind::Const(_, body_id),
+ ..
+ }) = node &&
+ let Node::Expr(&Expr {
+ kind: ExprKind::Lit(_),
+ span,
+ ..
+ }) = self.lcx.tcx.hir().get(body_id.hir_id) &&
+ is_direct_expn_of(span, "cfg").is_some() {
+ return None;
+ }
+
+ let substs = self.typeck_results.node_substs(id);
+ let substs = if self.substs.is_empty() {
+ substs
+ } else {
+ EarlyBinder(substs).subst(self.lcx.tcx, self.substs)
+ };
+
+ let result = self
+ .lcx
+ .tcx
+ .const_eval_resolve(
+ self.param_env,
+ mir::UnevaluatedConst::new(ty::WithOptConstParam::unknown(def_id), substs),
+ None,
+ )
+ .ok()
+ .map(|val| rustc_middle::mir::ConstantKind::from_value(val, ty))?;
+ let result = miri_to_const(self.lcx.tcx, result);
+ if result.is_some() {
+ self.needed_resolution = true;
+ }
+ result
+ },
+ // FIXME: cover all usable cases.
+ _ => None,
+ }
+ }
+
+ fn index(&mut self, lhs: &'_ Expr<'_>, index: &'_ Expr<'_>) -> Option<Constant> {
+ let lhs = self.expr(lhs);
+ let index = self.expr(index);
+
+ match (lhs, index) {
+ (Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) {
+ Some(Constant::F32(x)) => Some(Constant::F32(*x)),
+ Some(Constant::F64(x)) => Some(Constant::F64(*x)),
+ _ => None,
+ },
+ (Some(Constant::Vec(vec)), _) => {
+ if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
+ match vec.get(0) {
+ Some(Constant::F32(x)) => Some(Constant::F32(*x)),
+ Some(Constant::F64(x)) => Some(Constant::F64(*x)),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+ }
+
+ /// A block can only yield a constant if it only has one constant expression.
+ fn block(&mut self, block: &Block<'_>) -> Option<Constant> {
+ if block.stmts.is_empty() {
+ block.expr.as_ref().and_then(|b| self.expr(b))
+ } else {
+ None
+ }
+ }
+
+ fn ifthenelse(&mut self, cond: &Expr<'_>, then: &Expr<'_>, otherwise: Option<&Expr<'_>>) -> Option<Constant> {
+ if let Some(Constant::Bool(b)) = self.expr(cond) {
+ if b {
+ self.expr(then)
+ } else {
+ otherwise.as_ref().and_then(|expr| self.expr(expr))
+ }
+ } else {
+ None
+ }
+ }
+
+ fn binop(&mut self, op: BinOp, left: &Expr<'_>, right: &Expr<'_>) -> Option<Constant> {
+ let l = self.expr(left)?;
+ let r = self.expr(right);
+ match (l, r) {
+ (Constant::Int(l), Some(Constant::Int(r))) => match *self.typeck_results.expr_ty_opt(left)?.kind() {
+ ty::Int(ity) => {
+ let l = sext(self.lcx.tcx, l, ity);
+ let r = sext(self.lcx.tcx, r, ity);
+ let zext = |n: i128| Constant::Int(unsext(self.lcx.tcx, n, ity));
+ match op.node {
+ BinOpKind::Add => l.checked_add(r).map(zext),
+ BinOpKind::Sub => l.checked_sub(r).map(zext),
+ BinOpKind::Mul => l.checked_mul(r).map(zext),
+ BinOpKind::Div if r != 0 => l.checked_div(r).map(zext),
+ BinOpKind::Rem if r != 0 => l.checked_rem(r).map(zext),
+ BinOpKind::Shr => l.checked_shr(r.try_into().ok()?).map(zext),
+ BinOpKind::Shl => l.checked_shl(r.try_into().ok()?).map(zext),
+ BinOpKind::BitXor => Some(zext(l ^ r)),
+ BinOpKind::BitOr => Some(zext(l | r)),
+ BinOpKind::BitAnd => Some(zext(l & r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ }
+ },
+ ty::Uint(_) => match op.node {
+ BinOpKind::Add => l.checked_add(r).map(Constant::Int),
+ BinOpKind::Sub => l.checked_sub(r).map(Constant::Int),
+ BinOpKind::Mul => l.checked_mul(r).map(Constant::Int),
+ BinOpKind::Div => l.checked_div(r).map(Constant::Int),
+ BinOpKind::Rem => l.checked_rem(r).map(Constant::Int),
+ BinOpKind::Shr => l.checked_shr(r.try_into().ok()?).map(Constant::Int),
+ BinOpKind::Shl => l.checked_shl(r.try_into().ok()?).map(Constant::Int),
+ BinOpKind::BitXor => Some(Constant::Int(l ^ r)),
+ BinOpKind::BitOr => Some(Constant::Int(l | r)),
+ BinOpKind::BitAnd => Some(Constant::Int(l & r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ _ => None,
+ },
+ (Constant::F32(l), Some(Constant::F32(r))) => match op.node {
+ BinOpKind::Add => Some(Constant::F32(l + r)),
+ BinOpKind::Sub => Some(Constant::F32(l - r)),
+ BinOpKind::Mul => Some(Constant::F32(l * r)),
+ BinOpKind::Div => Some(Constant::F32(l / r)),
+ BinOpKind::Rem => Some(Constant::F32(l % r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ (Constant::F64(l), Some(Constant::F64(r))) => match op.node {
+ BinOpKind::Add => Some(Constant::F64(l + r)),
+ BinOpKind::Sub => Some(Constant::F64(l - r)),
+ BinOpKind::Mul => Some(Constant::F64(l * r)),
+ BinOpKind::Div => Some(Constant::F64(l / r)),
+ BinOpKind::Rem => Some(Constant::F64(l % r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ (l, r) => match (op.node, l, r) {
+ (BinOpKind::And, Constant::Bool(false), _) => Some(Constant::Bool(false)),
+ (BinOpKind::Or, Constant::Bool(true), _) => Some(Constant::Bool(true)),
+ (BinOpKind::And, Constant::Bool(true), Some(r)) | (BinOpKind::Or, Constant::Bool(false), Some(r)) => {
+ Some(r)
+ },
+ (BinOpKind::BitXor, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l ^ r)),
+ (BinOpKind::BitAnd, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l & r)),
+ (BinOpKind::BitOr, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l | r)),
+ _ => None,
+ },
+ }
+ }
+}
+
+pub fn miri_to_const<'tcx>(tcx: TyCtxt<'tcx>, result: mir::ConstantKind<'tcx>) -> Option<Constant> {
+ use rustc_middle::mir::interpret::ConstValue;
+ match result {
+ mir::ConstantKind::Val(ConstValue::Scalar(Scalar::Int(int)), _) => {
+ match result.ty().kind() {
+ ty::Bool => Some(Constant::Bool(int == ScalarInt::TRUE)),
+ ty::Uint(_) | ty::Int(_) => Some(Constant::Int(int.assert_bits(int.size()))),
+ ty::Float(FloatTy::F32) => Some(Constant::F32(f32::from_bits(
+ int.try_into().expect("invalid f32 bit representation"),
+ ))),
+ ty::Float(FloatTy::F64) => Some(Constant::F64(f64::from_bits(
+ int.try_into().expect("invalid f64 bit representation"),
+ ))),
+ ty::RawPtr(type_and_mut) => {
+ if let ty::Uint(_) = type_and_mut.ty.kind() {
+ return Some(Constant::RawPtr(int.assert_bits(int.size())));
+ }
+ None
+ },
+ // FIXME: implement other conversions.
+ _ => None,
+ }
+ },
+ mir::ConstantKind::Val(ConstValue::Slice { data, start, end }, _) => match result.ty().kind() {
+ ty::Ref(_, tam, _) => match tam.kind() {
+ ty::Str => String::from_utf8(
+ data.inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(start..end)
+ .to_owned(),
+ )
+ .ok()
+ .map(Constant::Str),
+ _ => None,
+ },
+ _ => None,
+ },
+ mir::ConstantKind::Val(ConstValue::ByRef { alloc, offset: _ }, _) => match result.ty().kind() {
+ ty::Array(sub_type, len) => match sub_type.kind() {
+ ty::Float(FloatTy::F32) => match len.kind().try_to_machine_usize(tcx) {
+ Some(len) => alloc
+ .inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(0..(4 * usize::try_from(len).unwrap()))
+ .to_owned()
+ .array_chunks::<4>()
+ .map(|&chunk| Some(Constant::F32(f32::from_le_bytes(chunk))))
+ .collect::<Option<Vec<Constant>>>()
+ .map(Constant::Vec),
+ _ => None,
+ },
+ ty::Float(FloatTy::F64) => match len.kind().try_to_machine_usize(tcx) {
+ Some(len) => alloc
+ .inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(0..(8 * usize::try_from(len).unwrap()))
+ .to_owned()
+ .array_chunks::<8>()
+ .map(|&chunk| Some(Constant::F64(f64::from_le_bytes(chunk))))
+ .collect::<Option<Vec<Constant>>>()
+ .map(Constant::Vec),
+ _ => None,
+ },
+ // FIXME: implement other array type conversions.
+ _ => None,
+ },
+ _ => None,
+ },
+ // FIXME: implement other conversions.
+ _ => None,
+ }
+}
--- /dev/null
- self.eagerness = Lazy;
+//! Utilities for evaluating whether eagerly evaluated expressions can be made lazy and vice versa.
+//!
+//! Things to consider:
+//! - has the expression side-effects?
+//! - is the expression computationally expensive?
+//!
+//! See lints:
+//! - unnecessary-lazy-evaluations
+//! - or-fun-call
+//! - option-if-let-else
+
+use crate::ty::{all_predicates_of, is_copy};
+use crate::visitors::is_const_evaluatable;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{def_id::DefId, Block, Expr, ExprKind, QPath, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, PredicateKind};
+use rustc_span::{sym, Symbol};
+use std::cmp;
+use std::ops;
+
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+enum EagernessSuggestion {
+ // The expression is cheap and should be evaluated eagerly
+ Eager,
+ // The expression may be cheap, so don't suggested lazy evaluation; or the expression may not be safe to switch to
+ // eager evaluation.
+ NoChange,
+ // The expression is likely expensive and should be evaluated lazily.
+ Lazy,
+ // The expression cannot be placed into a closure.
+ ForceNoChange,
+}
+impl ops::BitOr for EagernessSuggestion {
+ type Output = Self;
+ fn bitor(self, rhs: Self) -> Self {
+ cmp::max(self, rhs)
+ }
+}
+impl ops::BitOrAssign for EagernessSuggestion {
+ fn bitor_assign(&mut self, rhs: Self) {
+ *self = *self | rhs;
+ }
+}
+
+/// Determine the eagerness of the given function call.
+fn fn_eagerness(cx: &LateContext<'_>, fn_id: DefId, name: Symbol, have_one_arg: bool) -> EagernessSuggestion {
+ use EagernessSuggestion::{Eager, Lazy, NoChange};
+ let name = name.as_str();
+
+ let ty = match cx.tcx.impl_of_method(fn_id) {
+ Some(id) => cx.tcx.type_of(id),
+ None => return Lazy,
+ };
+
+ if (name.starts_with("as_") || name == "len" || name == "is_empty") && have_one_arg {
+ if matches!(
+ cx.tcx.crate_name(fn_id.krate),
+ sym::std | sym::core | sym::alloc | sym::proc_macro
+ ) {
+ Eager
+ } else {
+ NoChange
+ }
+ } else if let ty::Adt(def, subs) = ty.kind() {
+ // Types where the only fields are generic types (or references to) with no trait bounds other
+ // than marker traits.
+ // Due to the limited operations on these types functions should be fairly cheap.
+ if def
+ .variants()
+ .iter()
+ .flat_map(|v| v.fields.iter())
+ .any(|x| matches!(cx.tcx.type_of(x.did).peel_refs().kind(), ty::Param(_)))
+ && all_predicates_of(cx.tcx, fn_id).all(|(pred, _)| match pred.kind().skip_binder() {
+ PredicateKind::Trait(pred) => cx.tcx.trait_def(pred.trait_ref.def_id).is_marker,
+ _ => true,
+ })
+ && subs.types().all(|x| matches!(x.peel_refs().kind(), ty::Param(_)))
+ {
+ // Limit the function to either `(self) -> bool` or `(&self) -> bool`
+ match &**cx.tcx.fn_sig(fn_id).skip_binder().inputs_and_output {
+ [arg, res] if !arg.is_mutable_ptr() && arg.peel_refs() == ty && res.is_bool() => NoChange,
+ _ => Lazy,
+ }
+ } else {
+ Lazy
+ }
+ } else {
+ Lazy
+ }
+}
+
+#[expect(clippy::too_many_lines)]
+fn expr_eagerness<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> EagernessSuggestion {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ eagerness: EagernessSuggestion,
+ }
+
+ impl<'cx, 'tcx> Visitor<'tcx> for V<'cx, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ use EagernessSuggestion::{ForceNoChange, Lazy, NoChange};
+ if self.eagerness == ForceNoChange {
+ return;
+ }
+ match e.kind {
+ ExprKind::Call(
+ &Expr {
+ kind: ExprKind::Path(ref path),
+ hir_id,
+ ..
+ },
+ args,
+ ) => match self.cx.qpath_res(path, hir_id) {
+ Res::Def(DefKind::Ctor(..) | DefKind::Variant, _) | Res::SelfCtor(_) => {
+ if self
+ .cx
+ .typeck_results()
+ .expr_ty(e)
+ .has_significant_drop(self.cx.tcx, self.cx.param_env)
+ {
++ self.eagerness = ForceNoChange;
+ return;
+ }
+ },
+ Res::Def(_, id) if self.cx.tcx.is_promotable_const_fn(id) => (),
+ // No need to walk the arguments here, `is_const_evaluatable` already did
+ Res::Def(..) if is_const_evaluatable(self.cx, e) => {
+ self.eagerness |= NoChange;
+ return;
+ },
+ Res::Def(_, id) => match path {
+ QPath::Resolved(_, p) => {
+ self.eagerness |=
+ fn_eagerness(self.cx, id, p.segments.last().unwrap().ident.name, !args.is_empty());
+ },
+ QPath::TypeRelative(_, name) => {
+ self.eagerness |= fn_eagerness(self.cx, id, name.ident.name, !args.is_empty());
+ },
+ QPath::LangItem(..) => self.eagerness = Lazy,
+ },
+ _ => self.eagerness = Lazy,
+ },
+ // No need to walk the arguments here, `is_const_evaluatable` already did
+ ExprKind::MethodCall(..) if is_const_evaluatable(self.cx, e) => {
+ self.eagerness |= NoChange;
+ return;
+ },
+ ExprKind::MethodCall(name, ..) => {
+ self.eagerness |= self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(e.hir_id)
+ .map_or(Lazy, |id| fn_eagerness(self.cx, id, name.ident.name, true));
+ },
+ ExprKind::Index(_, e) => {
+ let ty = self.cx.typeck_results().expr_ty_adjusted(e);
+ if is_copy(self.cx, ty) && !ty.is_ref() {
+ self.eagerness |= NoChange;
+ } else {
+ self.eagerness = Lazy;
+ }
+ },
+
+ // Dereferences should be cheap, but dereferencing a raw pointer earlier may not be safe.
+ ExprKind::Unary(UnOp::Deref, e) if !self.cx.typeck_results().expr_ty(e).is_unsafe_ptr() => (),
+ ExprKind::Unary(UnOp::Deref, _) => self.eagerness |= NoChange,
+
+ ExprKind::Unary(_, e)
+ if matches!(
+ self.cx.typeck_results().expr_ty(e).kind(),
+ ty::Bool | ty::Int(_) | ty::Uint(_),
+ ) => {},
+ ExprKind::Binary(_, lhs, rhs)
+ if self.cx.typeck_results().expr_ty(lhs).is_primitive()
+ && self.cx.typeck_results().expr_ty(rhs).is_primitive() => {},
+
+ // Can't be moved into a closure
+ ExprKind::Break(..)
+ | ExprKind::Continue(_)
+ | ExprKind::Ret(_)
+ | ExprKind::InlineAsm(_)
+ | ExprKind::Yield(..)
+ | ExprKind::Err => {
+ self.eagerness = ForceNoChange;
+ return;
+ },
+
+ // Memory allocation, custom operator, loop, or call to an unknown function
+ ExprKind::Box(_)
+ | ExprKind::Unary(..)
+ | ExprKind::Binary(..)
+ | ExprKind::Loop(..)
+ | ExprKind::Call(..) => self.eagerness = Lazy,
+
+ ExprKind::ConstBlock(_)
+ | ExprKind::Array(_)
+ | ExprKind::Tup(_)
+ | ExprKind::Lit(_)
+ | ExprKind::Cast(..)
+ | ExprKind::Type(..)
+ | ExprKind::DropTemps(_)
+ | ExprKind::Let(..)
+ | ExprKind::If(..)
+ | ExprKind::Match(..)
+ | ExprKind::Closure { .. }
+ | ExprKind::Field(..)
+ | ExprKind::Path(_)
+ | ExprKind::AddrOf(..)
+ | ExprKind::Struct(..)
+ | ExprKind::Repeat(..)
+ | ExprKind::Block(Block { stmts: [], .. }, _) => (),
+
+ // Assignment might be to a local defined earlier, so don't eagerly evaluate.
+ // Blocks with multiple statements might be expensive, so don't eagerly evaluate.
+ // TODO: Actually check if either of these are true here.
+ ExprKind::Assign(..) | ExprKind::AssignOp(..) | ExprKind::Block(..) => self.eagerness |= NoChange,
+ }
+ walk_expr(self, e);
+ }
+ }
+
+ let mut v = V {
+ cx,
+ eagerness: EagernessSuggestion::Eager,
+ };
+ v.visit_expr(e);
+ v.eagerness
+}
+
+/// Whether the given expression should be changed to evaluate eagerly
+pub fn switch_to_eager_eval<'tcx>(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+ expr_eagerness(cx, expr) == EagernessSuggestion::Eager
+}
+
+/// Whether the given expression should be changed to evaluate lazily
+pub fn switch_to_lazy_eval<'tcx>(cx: &'_ LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+ expr_eagerness(cx, expr) == EagernessSuggestion::Lazy
+}
--- /dev/null
- sess.span_err(span, &format!("`{msrv}` is not a valid Rust version"));
+#![feature(array_chunks)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(let_chains)]
+#![feature(lint_reasons)]
+#![feature(never_type)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_errors_doc, clippy::missing_panics_doc, clippy::must_use_candidate)]
+// warn on the same lints as `clippy_lints`
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
+extern crate rustc_data_structures;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_typeck;
++extern crate rustc_index;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_lint;
+extern crate rustc_middle;
++extern crate rustc_mir_dataflow;
+extern crate rustc_parse_format;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+
+#[macro_use]
+pub mod sym_helper;
+
+pub mod ast_utils;
+pub mod attrs;
+mod check_proc_macro;
+pub mod comparisons;
+pub mod consts;
+pub mod diagnostics;
+pub mod eager_or_lazy;
+pub mod higher;
+mod hir_utils;
+pub mod macros;
++pub mod mir;
+pub mod msrvs;
+pub mod numeric_literal;
+pub mod paths;
+pub mod ptr;
+pub mod qualify_min_const_fn;
+pub mod source;
+pub mod str_utils;
+pub mod sugg;
+pub mod ty;
+pub mod usage;
+pub mod visitors;
+
+pub use self::attrs::*;
+pub use self::check_proc_macro::{is_from_proc_macro, is_span_if, is_span_match};
+pub use self::hir_utils::{
+ both, count_eq, eq_expr_value, hash_expr, hash_stmt, over, HirEqInterExpr, SpanlessEq, SpanlessHash,
+};
+
+use core::ops::ControlFlow;
+use std::collections::hash_map::Entry;
+use std::hash::BuildHasherDefault;
+use std::sync::OnceLock;
+use std::sync::{Mutex, MutexGuard};
+
+use if_chain::if_chain;
+use rustc_ast::ast::{self, LitKind};
+use rustc_ast::Attribute;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::unhash::UnhashMap;
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Namespace, Res};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId};
+use rustc_hir::hir_id::{HirIdMap, HirIdSet};
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::LangItem::{OptionNone, ResultErr, ResultOk};
+use rustc_hir::{
+ def, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Closure, Constness, Destination, Expr,
+ ExprKind, FnDecl, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem, Local, MatchSource,
+ Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, TraitItem, TraitItemKind,
+ TraitRef, TyKind, UnOp,
+};
+use rustc_lexer::{tokenize, TokenKind};
+use rustc_lint::{LateContext, Level, Lint, LintContext};
+use rustc_middle::hir::place::PlaceBase;
+use rustc_middle::ty as rustc_ty;
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
+use rustc_middle::ty::binding::BindingMode;
+use rustc_middle::ty::fast_reject::SimplifiedTypeGen::{
+ ArraySimplifiedType, BoolSimplifiedType, CharSimplifiedType, FloatSimplifiedType, IntSimplifiedType,
+ PtrSimplifiedType, SliceSimplifiedType, StrSimplifiedType, UintSimplifiedType,
+};
+use rustc_middle::ty::{
+ layout::IntegerExt, BorrowKind, ClosureKind, DefIdTree, Ty, TyCtxt, TypeAndMut, TypeVisitable, UpvarCapture,
+};
+use rustc_middle::ty::{FloatTy, IntTy, UintTy};
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+use rustc_span::hygiene::{ExpnKind, MacroKind};
+use rustc_span::source_map::original_sp;
+use rustc_span::source_map::SourceMap;
+use rustc_span::sym;
+use rustc_span::symbol::{kw, Symbol};
+use rustc_span::{Span, DUMMY_SP};
+use rustc_target::abi::Integer;
+
+use crate::consts::{constant, Constant};
+use crate::ty::{can_partially_move_ty, expr_sig, is_copy, is_recursively_primitive_type, ty_is_fn_once_param};
+use crate::visitors::for_each_expr;
+
+pub fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Option<RustcVersion> {
+ if let Ok(version) = RustcVersion::parse(msrv) {
+ return Some(version);
+ } else if let Some(sess) = sess {
+ if let Some(span) = span {
- ExprKind::Call(repl_func, _) => is_default_equivalent_call(cx, repl_func),
++ sess.span_err(span, format!("`{msrv}` is not a valid Rust version"));
+ }
+ }
+ None
+}
+
+pub fn meets_msrv(msrv: Option<RustcVersion>, lint_msrv: RustcVersion) -> bool {
+ msrv.map_or(true, |msrv| msrv.meets(lint_msrv))
+}
+
+#[macro_export]
+macro_rules! extract_msrv_attr {
+ ($context:ident) => {
+ fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
+ let sess = rustc_lint::LintContext::sess(cx);
+ match $crate::get_unique_inner_attr(sess, attrs, "msrv") {
+ Some(msrv_attr) => {
+ if let Some(msrv) = msrv_attr.value_str() {
+ self.msrv = $crate::parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
+ } else {
+ sess.span_err(msrv_attr.span, "bad clippy attribute");
+ }
+ },
+ _ => (),
+ }
+ }
+ };
+}
+
+/// If the given expression is a local binding, find the initializer expression.
+/// If that initializer expression is another local binding, find its initializer again.
+/// This process repeats as long as possible (but usually no more than once). Initializer
+/// expressions with adjustments are ignored. If this is not desired, use [`find_binding_init`]
+/// instead.
+///
+/// Examples:
+/// ```
+/// let abc = 1;
+/// // ^ output
+/// let def = abc;
+/// dbg!(def);
+/// // ^^^ input
+///
+/// // or...
+/// let abc = 1;
+/// let def = abc + 2;
+/// // ^^^^^^^ output
+/// dbg!(def);
+/// // ^^^ input
+/// ```
+pub fn expr_or_init<'a, 'b, 'tcx: 'b>(cx: &LateContext<'tcx>, mut expr: &'a Expr<'b>) -> &'a Expr<'b> {
+ while let Some(init) = path_to_local(expr)
+ .and_then(|id| find_binding_init(cx, id))
+ .filter(|init| cx.typeck_results().expr_adjustments(init).is_empty())
+ {
+ expr = init;
+ }
+ expr
+}
+
+/// Finds the initializer expression for a local binding. Returns `None` if the binding is mutable.
+/// By only considering immutable bindings, we guarantee that the returned expression represents the
+/// value of the binding wherever it is referenced.
+///
+/// Example: For `let x = 1`, if the `HirId` of `x` is provided, the `Expr` `1` is returned.
+/// Note: If you have an expression that references a binding `x`, use `path_to_local` to get the
+/// canonical binding `HirId`.
+pub fn find_binding_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
+ let hir = cx.tcx.hir();
+ if_chain! {
+ if let Some(Node::Pat(pat)) = hir.find(hir_id);
+ if matches!(pat.kind, PatKind::Binding(BindingAnnotation::NONE, ..));
+ let parent = hir.get_parent_node(hir_id);
+ if let Some(Node::Local(local)) = hir.find(parent);
+ then {
+ return local.init;
+ }
+ }
+ None
+}
+
+/// Returns `true` if the given `NodeId` is inside a constant context
+///
+/// # Example
+///
+/// ```rust,ignore
+/// if in_constant(cx, expr.hir_id) {
+/// // Do something
+/// }
+/// ```
+pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool {
+ let parent_id = cx.tcx.hir().get_parent_item(id).def_id;
+ match cx.tcx.hir().get_by_def_id(parent_id) {
+ Node::Item(&Item {
+ kind: ItemKind::Const(..) | ItemKind::Static(..),
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ ..
+ })
+ | Node::AnonConst(_) => true,
+ Node::Item(&Item {
+ kind: ItemKind::Fn(ref sig, ..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(ref sig, _),
+ ..
+ }) => sig.header.constness == Constness::Const,
+ _ => false,
+ }
+}
+
+/// Checks if a `Res` refers to a constructor of a `LangItem`
+/// For example, use this to check whether a function call or a pattern is `Some(..)`.
+pub fn is_res_lang_ctor(cx: &LateContext<'_>, res: Res, lang_item: LangItem) -> bool {
+ if let Res::Def(DefKind::Ctor(..), id) = res
+ && let Ok(lang_id) = cx.tcx.lang_items().require(lang_item)
+ && let Some(id) = cx.tcx.opt_parent(id)
+ {
+ id == lang_id
+ } else {
+ false
+ }
+}
+
+pub fn is_res_diagnostic_ctor(cx: &LateContext<'_>, res: Res, diag_item: Symbol) -> bool {
+ if let Res::Def(DefKind::Ctor(..), id) = res
+ && let Some(id) = cx.tcx.opt_parent(id)
+ {
+ cx.tcx.is_diagnostic_item(diag_item, id)
+ } else {
+ false
+ }
+}
+
+/// Checks if a `QPath` resolves to a constructor of a diagnostic item.
+pub fn is_diagnostic_ctor(cx: &LateContext<'_>, qpath: &QPath<'_>, diagnostic_item: Symbol) -> bool {
+ if let QPath::Resolved(_, path) = qpath {
+ if let Res::Def(DefKind::Ctor(..), ctor_id) = path.res {
+ return cx.tcx.is_diagnostic_item(diagnostic_item, cx.tcx.parent(ctor_id));
+ }
+ }
+ false
+}
+
+/// Checks if the `DefId` matches the given diagnostic item or it's constructor.
+pub fn is_diagnostic_item_or_ctor(cx: &LateContext<'_>, did: DefId, item: Symbol) -> bool {
+ let did = match cx.tcx.def_kind(did) {
+ DefKind::Ctor(..) => cx.tcx.parent(did),
+ // Constructors for types in external crates seem to have `DefKind::Variant`
+ DefKind::Variant => match cx.tcx.opt_parent(did) {
+ Some(did) if matches!(cx.tcx.def_kind(did), DefKind::Variant) => did,
+ _ => did,
+ },
+ _ => did,
+ };
+
+ cx.tcx.is_diagnostic_item(item, did)
+}
+
+/// Checks if the `DefId` matches the given `LangItem` or it's constructor.
+pub fn is_lang_item_or_ctor(cx: &LateContext<'_>, did: DefId, item: LangItem) -> bool {
+ let did = match cx.tcx.def_kind(did) {
+ DefKind::Ctor(..) => cx.tcx.parent(did),
+ // Constructors for types in external crates seem to have `DefKind::Variant`
+ DefKind::Variant => match cx.tcx.opt_parent(did) {
+ Some(did) if matches!(cx.tcx.def_kind(did), DefKind::Variant) => did,
+ _ => did,
+ },
+ _ => did,
+ };
+
+ cx.tcx.lang_items().require(item).map_or(false, |id| id == did)
+}
+
+pub fn is_unit_expr(expr: &Expr<'_>) -> bool {
+ matches!(
+ expr.kind,
+ ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: None,
+ ..
+ },
+ _
+ ) | ExprKind::Tup([])
+ )
+}
+
+/// Checks if given pattern is a wildcard (`_`)
+pub fn is_wild(pat: &Pat<'_>) -> bool {
+ matches!(pat.kind, PatKind::Wild)
+}
+
+/// Checks if the method call given in `expr` belongs to the given trait.
+/// This is a deprecated function, consider using [`is_trait_method`].
+pub fn match_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, path: &[&str]) -> bool {
+ let def_id = cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
+ let trt_id = cx.tcx.trait_of_item(def_id);
+ trt_id.map_or(false, |trt_id| match_def_path(cx, trt_id, path))
+}
+
+/// Checks if a method is defined in an impl of a diagnostic item
+pub fn is_diag_item_method(cx: &LateContext<'_>, def_id: DefId, diag_item: Symbol) -> bool {
+ if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
+ if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
+ return cx.tcx.is_diagnostic_item(diag_item, adt.did());
+ }
+ }
+ false
+}
+
+/// Checks if a method is in a diagnostic item trait
+pub fn is_diag_trait_item(cx: &LateContext<'_>, def_id: DefId, diag_item: Symbol) -> bool {
+ if let Some(trait_did) = cx.tcx.trait_of_item(def_id) {
+ return cx.tcx.is_diagnostic_item(diag_item, trait_did);
+ }
+ false
+}
+
+/// Checks if the method call given in `expr` belongs to the given trait.
+pub fn is_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ cx.typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .map_or(false, |did| is_diag_trait_item(cx, did, diag_item))
+}
+
+/// Checks if the given expression is a path referring an item on the trait
+/// that is marked with the given diagnostic item.
+///
+/// For checking method call expressions instead of path expressions, use
+/// [`is_trait_method`].
+///
+/// For example, this can be used to find if an expression like `u64::default`
+/// refers to an item of the trait `Default`, which is associated with the
+/// `diag_item` of `sym::Default`.
+pub fn is_trait_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ if let hir::ExprKind::Path(ref qpath) = expr.kind {
+ cx.qpath_res(qpath, expr.hir_id)
+ .opt_def_id()
+ .map_or(false, |def_id| is_diag_trait_item(cx, def_id, diag_item))
+ } else {
+ false
+ }
+}
+
+pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> {
+ match *path {
+ QPath::Resolved(_, path) => path.segments.last().expect("A path must have at least one segment"),
+ QPath::TypeRelative(_, seg) => seg,
+ QPath::LangItem(..) => panic!("last_path_segment: lang item has no path segments"),
+ }
+}
+
+pub fn qpath_generic_tys<'tcx>(qpath: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
+ last_path_segment(qpath)
+ .args
+ .map_or(&[][..], |a| a.args)
+ .iter()
+ .filter_map(|a| match a {
+ hir::GenericArg::Type(ty) => Some(*ty),
+ _ => None,
+ })
+}
+
+/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
+/// entire path or resolved `DefId`. Prefer using `match_def_path`. Consider getting a `DefId` from
+/// `QPath::Resolved.1.res.opt_def_id()`.
+///
+/// Matches a `QPath` against a slice of segment string literals.
+///
+/// There is also `match_path` if you are dealing with a `rustc_hir::Path` instead of a
+/// `rustc_hir::QPath`.
+///
+/// # Examples
+/// ```rust,ignore
+/// match_qpath(path, &["std", "rt", "begin_unwind"])
+/// ```
+pub fn match_qpath(path: &QPath<'_>, segments: &[&str]) -> bool {
+ match *path {
+ QPath::Resolved(_, path) => match_path(path, segments),
+ QPath::TypeRelative(ty, segment) => match ty.kind {
+ TyKind::Path(ref inner_path) => {
+ if let [prefix @ .., end] = segments {
+ if match_qpath(inner_path, prefix) {
+ return segment.ident.name.as_str() == *end;
+ }
+ }
+ false
+ },
+ _ => false,
+ },
+ QPath::LangItem(..) => false,
+ }
+}
+
+/// If the expression is a path, resolves it to a `DefId` and checks if it matches the given path.
+///
+/// Please use `is_path_diagnostic_item` if the target is a diagnostic item.
+pub fn is_expr_path_def_path(cx: &LateContext<'_>, expr: &Expr<'_>, segments: &[&str]) -> bool {
+ path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, segments))
+}
+
+/// If `maybe_path` is a path node which resolves to an item, resolves it to a `DefId` and checks if
+/// it matches the given diagnostic item.
+pub fn is_path_diagnostic_item<'tcx>(
+ cx: &LateContext<'_>,
+ maybe_path: &impl MaybePath<'tcx>,
+ diag_item: Symbol,
+) -> bool {
+ path_def_id(cx, maybe_path).map_or(false, |id| cx.tcx.is_diagnostic_item(diag_item, id))
+}
+
+/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
+/// entire path or resolved `DefId`. Prefer using `match_def_path`. Consider getting a `DefId` from
+/// `QPath::Resolved.1.res.opt_def_id()`.
+///
+/// Matches a `Path` against a slice of segment string literals.
+///
+/// There is also `match_qpath` if you are dealing with a `rustc_hir::QPath` instead of a
+/// `rustc_hir::Path`.
+///
+/// # Examples
+///
+/// ```rust,ignore
+/// if match_path(&trait_ref.path, &paths::HASH) {
+/// // This is the `std::hash::Hash` trait.
+/// }
+///
+/// if match_path(ty_path, &["rustc", "lint", "Lint"]) {
+/// // This is a `rustc_middle::lint::Lint`.
+/// }
+/// ```
+pub fn match_path(path: &Path<'_>, segments: &[&str]) -> bool {
+ path.segments
+ .iter()
+ .rev()
+ .zip(segments.iter().rev())
+ .all(|(a, b)| a.ident.name.as_str() == *b)
+}
+
+/// If the expression is a path to a local, returns the canonical `HirId` of the local.
+pub fn path_to_local(expr: &Expr<'_>) -> Option<HirId> {
+ if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind {
+ if let Res::Local(id) = path.res {
+ return Some(id);
+ }
+ }
+ None
+}
+
+/// Returns true if the expression is a path to a local with the specified `HirId`.
+/// Use this function to see if an expression matches a function argument or a match binding.
+pub fn path_to_local_id(expr: &Expr<'_>, id: HirId) -> bool {
+ path_to_local(expr) == Some(id)
+}
+
+pub trait MaybePath<'hir> {
+ fn hir_id(&self) -> HirId;
+ fn qpath_opt(&self) -> Option<&QPath<'hir>>;
+}
+
+macro_rules! maybe_path {
+ ($ty:ident, $kind:ident) => {
+ impl<'hir> MaybePath<'hir> for hir::$ty<'hir> {
+ fn hir_id(&self) -> HirId {
+ self.hir_id
+ }
+ fn qpath_opt(&self) -> Option<&QPath<'hir>> {
+ match &self.kind {
+ hir::$kind::Path(qpath) => Some(qpath),
+ _ => None,
+ }
+ }
+ }
+ };
+}
+maybe_path!(Expr, ExprKind);
+maybe_path!(Pat, PatKind);
+maybe_path!(Ty, TyKind);
+
+/// If `maybe_path` is a path node, resolves it, otherwise returns `Res::Err`
+pub fn path_res<'tcx>(cx: &LateContext<'_>, maybe_path: &impl MaybePath<'tcx>) -> Res {
+ match maybe_path.qpath_opt() {
+ None => Res::Err,
+ Some(qpath) => cx.qpath_res(qpath, maybe_path.hir_id()),
+ }
+}
+
+/// If `maybe_path` is a path node which resolves to an item, retrieves the item ID
+pub fn path_def_id<'tcx>(cx: &LateContext<'_>, maybe_path: &impl MaybePath<'tcx>) -> Option<DefId> {
+ path_res(cx, maybe_path).opt_def_id()
+}
+
+fn find_primitive<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
+ let single = |ty| tcx.incoherent_impls(ty).iter().copied();
+ let empty = || [].iter().copied();
+ match name {
+ "bool" => single(BoolSimplifiedType),
+ "char" => single(CharSimplifiedType),
+ "str" => single(StrSimplifiedType),
+ "array" => single(ArraySimplifiedType),
+ "slice" => single(SliceSimplifiedType),
+ // FIXME: rustdoc documents these two using just `pointer`.
+ //
+ // Maybe this is something we should do here too.
+ "const_ptr" => single(PtrSimplifiedType(Mutability::Not)),
+ "mut_ptr" => single(PtrSimplifiedType(Mutability::Mut)),
+ "isize" => single(IntSimplifiedType(IntTy::Isize)),
+ "i8" => single(IntSimplifiedType(IntTy::I8)),
+ "i16" => single(IntSimplifiedType(IntTy::I16)),
+ "i32" => single(IntSimplifiedType(IntTy::I32)),
+ "i64" => single(IntSimplifiedType(IntTy::I64)),
+ "i128" => single(IntSimplifiedType(IntTy::I128)),
+ "usize" => single(UintSimplifiedType(UintTy::Usize)),
+ "u8" => single(UintSimplifiedType(UintTy::U8)),
+ "u16" => single(UintSimplifiedType(UintTy::U16)),
+ "u32" => single(UintSimplifiedType(UintTy::U32)),
+ "u64" => single(UintSimplifiedType(UintTy::U64)),
+ "u128" => single(UintSimplifiedType(UintTy::U128)),
+ "f32" => single(FloatSimplifiedType(FloatTy::F32)),
+ "f64" => single(FloatSimplifiedType(FloatTy::F64)),
+ _ => empty(),
+ }
+}
+
+/// Resolves a def path like `std::vec::Vec`. `namespace_hint` can be supplied to disambiguate
+/// between `std::vec` the module and `std::vec` the macro
+///
+/// This function is expensive and should be used sparingly.
+pub fn def_path_res(cx: &LateContext<'_>, path: &[&str], namespace_hint: Option<Namespace>) -> Res {
+ fn item_child_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: &str, matches_ns: impl Fn(Res) -> bool) -> Option<Res> {
+ match tcx.def_kind(def_id) {
+ DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
+ .module_children(def_id)
+ .iter()
+ .find(|item| item.ident.name.as_str() == name && matches_ns(item.res.expect_non_local()))
+ .map(|child| child.res.expect_non_local()),
+ DefKind::Impl => tcx
+ .associated_item_def_ids(def_id)
+ .iter()
+ .copied()
+ .find(|assoc_def_id| tcx.item_name(*assoc_def_id).as_str() == name)
+ .map(|assoc_def_id| Res::Def(tcx.def_kind(assoc_def_id), assoc_def_id)),
+ DefKind::Struct | DefKind::Union => tcx
+ .adt_def(def_id)
+ .non_enum_variant()
+ .fields
+ .iter()
+ .find(|f| f.name.as_str() == name)
+ .map(|f| Res::Def(DefKind::Field, f.did)),
+ _ => None,
+ }
+ }
+
+ fn find_crate(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
+ tcx.crates(())
+ .iter()
+ .copied()
+ .find(|&num| tcx.crate_name(num).as_str() == name)
+ .map(CrateNum::as_def_id)
+ }
+
+ let (base, path) = match *path {
+ [primitive] => {
+ return PrimTy::from_name(Symbol::intern(primitive)).map_or(Res::Err, Res::PrimTy);
+ },
+ [base, ref path @ ..] => (base, path),
+ _ => return Res::Err,
+ };
+ let tcx = cx.tcx;
+ let starts = find_primitive(tcx, base)
+ .chain(find_crate(tcx, base))
+ .map(|id| Res::Def(tcx.def_kind(id), id));
+
+ for first in starts {
+ let last = path
+ .iter()
+ .copied()
+ .enumerate()
+ // for each segment, find the child item
+ .try_fold(first, |res, (idx, segment)| {
+ let matches_ns = |res: Res| {
+ // If at the last segment in the path, respect the namespace hint
+ if idx == path.len() - 1 {
+ match namespace_hint {
+ Some(ns) => res.matches_ns(ns),
+ None => true,
+ }
+ } else {
+ res.matches_ns(Namespace::TypeNS)
+ }
+ };
+
+ let def_id = res.def_id();
+ if let Some(item) = item_child_by_name(tcx, def_id, segment, matches_ns) {
+ Some(item)
+ } else if matches!(res, Res::Def(DefKind::Enum | DefKind::Struct, _)) {
+ // it is not a child item so check inherent impl items
+ tcx.inherent_impls(def_id)
+ .iter()
+ .find_map(|&impl_def_id| item_child_by_name(tcx, impl_def_id, segment, matches_ns))
+ } else {
+ None
+ }
+ });
+
+ if let Some(last) = last {
+ return last;
+ }
+ }
+
+ Res::Err
+}
+
+/// Convenience function to get the `DefId` of a trait by path.
+/// It could be a trait or trait alias.
+///
+/// This function is expensive and should be used sparingly.
+pub fn get_trait_def_id(cx: &LateContext<'_>, path: &[&str]) -> Option<DefId> {
+ match def_path_res(cx, path, Some(Namespace::TypeNS)) {
+ Res::Def(DefKind::Trait | DefKind::TraitAlias, trait_id) => Some(trait_id),
+ _ => None,
+ }
+}
+
+/// Gets the `hir::TraitRef` of the trait the given method is implemented for.
+///
+/// Use this if you want to find the `TraitRef` of the `Add` trait in this example:
+///
+/// ```rust
+/// struct Point(isize, isize);
+///
+/// impl std::ops::Add for Point {
+/// type Output = Self;
+///
+/// fn add(self, other: Self) -> Self {
+/// Point(0, 0)
+/// }
+/// }
+/// ```
+pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'tcx>, def_id: LocalDefId) -> Option<&'tcx TraitRef<'tcx>> {
+ // Get the implemented trait for the current function
+ let hir_id = cx.tcx.hir().local_def_id_to_hir_id(def_id);
+ let parent_impl = cx.tcx.hir().get_parent_item(hir_id);
+ if_chain! {
+ if parent_impl != hir::CRATE_OWNER_ID;
+ if let hir::Node::Item(item) = cx.tcx.hir().get_by_def_id(parent_impl.def_id);
+ if let hir::ItemKind::Impl(impl_) = &item.kind;
+ then {
+ return impl_.of_trait.as_ref();
+ }
+ }
+ None
+}
+
+/// This method will return tuple of projection stack and root of the expression,
+/// used in `can_mut_borrow_both`.
+///
+/// For example, if `e` represents the `v[0].a.b[x]`
+/// this method will return a tuple, composed of a `Vec`
+/// containing the `Expr`s for `v[0], v[0].a, v[0].a.b, v[0].a.b[x]`
+/// and an `Expr` for root of them, `v`
+fn projection_stack<'a, 'hir>(mut e: &'a Expr<'hir>) -> (Vec<&'a Expr<'hir>>, &'a Expr<'hir>) {
+ let mut result = vec![];
+ let root = loop {
+ match e.kind {
+ ExprKind::Index(ep, _) | ExprKind::Field(ep, _) => {
+ result.push(e);
+ e = ep;
+ },
+ _ => break e,
+ };
+ };
+ result.reverse();
+ (result, root)
+}
+
+/// Gets the mutability of the custom deref adjustment, if any.
+pub fn expr_custom_deref_adjustment(cx: &LateContext<'_>, e: &Expr<'_>) -> Option<Mutability> {
+ cx.typeck_results()
+ .expr_adjustments(e)
+ .iter()
+ .find_map(|a| match a.kind {
+ Adjust::Deref(Some(d)) => Some(Some(d.mutbl)),
+ Adjust::Deref(None) => None,
+ _ => Some(None),
+ })
+ .and_then(|x| x)
+}
+
+/// Checks if two expressions can be mutably borrowed simultaneously
+/// and they aren't dependent on borrowing same thing twice
+pub fn can_mut_borrow_both(cx: &LateContext<'_>, e1: &Expr<'_>, e2: &Expr<'_>) -> bool {
+ let (s1, r1) = projection_stack(e1);
+ let (s2, r2) = projection_stack(e2);
+ if !eq_expr_value(cx, r1, r2) {
+ return true;
+ }
+ if expr_custom_deref_adjustment(cx, r1).is_some() || expr_custom_deref_adjustment(cx, r2).is_some() {
+ return false;
+ }
+
+ for (x1, x2) in s1.iter().zip(s2.iter()) {
+ if expr_custom_deref_adjustment(cx, x1).is_some() || expr_custom_deref_adjustment(cx, x2).is_some() {
+ return false;
+ }
+
+ match (&x1.kind, &x2.kind) {
+ (ExprKind::Field(_, i1), ExprKind::Field(_, i2)) => {
+ if i1 != i2 {
+ return true;
+ }
+ },
+ (ExprKind::Index(_, i1), ExprKind::Index(_, i2)) => {
+ if !eq_expr_value(cx, i1, i2) {
+ return false;
+ }
+ },
+ _ => return false,
+ }
+ }
+ false
+}
+
+/// Returns true if the `def_id` associated with the `path` is recognized as a "default-equivalent"
+/// constructor from the std library
+fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<'_>) -> bool {
+ let std_types_symbols = &[
+ sym::String,
+ sym::Vec,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::HashMap,
+ sym::BTreeMap,
+ sym::HashSet,
+ sym::BTreeSet,
+ sym::BinaryHeap,
+ ];
+
+ if let QPath::TypeRelative(_, method) = path {
+ if method.ident.name == sym::new {
+ if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
+ if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
+ return std_types_symbols
+ .iter()
+ .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did()));
+ }
+ }
+ }
+ }
+ false
+}
+
+/// Return true if the expr is equal to `Default::default` when evaluated.
+pub fn is_default_equivalent_call(cx: &LateContext<'_>, repl_func: &Expr<'_>) -> bool {
+ if_chain! {
+ if let hir::ExprKind::Path(ref repl_func_qpath) = repl_func.kind;
+ if let Some(repl_def_id) = cx.qpath_res(repl_func_qpath, repl_func.hir_id).opt_def_id();
+ if is_diag_trait_item(cx, repl_def_id, sym::Default)
+ || is_default_equivalent_ctor(cx, repl_def_id, repl_func_qpath);
+ then { true } else { false }
+ }
+}
+
+/// Returns true if the expr is equal to `Default::default()` of it's type when evaluated.
+/// It doesn't cover all cases, for example indirect function calls (some of std
+/// functions are supported) but it is the best we have.
+pub fn is_default_equivalent(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ match &e.kind {
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Bool(false) | LitKind::Int(0, _) => true,
+ LitKind::Str(s, _) => s.is_empty(),
+ _ => false,
+ },
+ ExprKind::Tup(items) | ExprKind::Array(items) => items.iter().all(|x| is_default_equivalent(cx, x)),
+ ExprKind::Repeat(x, ArrayLen::Body(len)) => if_chain! {
+ if let ExprKind::Lit(ref const_lit) = cx.tcx.hir().body(len.body).value.kind;
+ if let LitKind::Int(v, _) = const_lit.node;
+ if v <= 32 && is_default_equivalent(cx, x);
+ then {
+ true
+ }
+ else {
+ false
+ }
+ },
++ ExprKind::Call(repl_func, []) => is_default_equivalent_call(cx, repl_func),
++ ExprKind::Call(from_func, [ref arg]) => is_default_equivalent_from(cx, from_func, arg),
+ ExprKind::Path(qpath) => is_res_lang_ctor(cx, cx.qpath_res(qpath, e.hir_id), OptionNone),
+ ExprKind::AddrOf(rustc_hir::BorrowKind::Ref, _, expr) => matches!(expr.kind, ExprKind::Array([])),
+ _ => false,
+ }
+}
+
++fn is_default_equivalent_from(cx: &LateContext<'_>, from_func: &Expr<'_>, arg: &Expr<'_>) -> bool {
++ if let ExprKind::Path(QPath::TypeRelative(ty, seg)) = from_func.kind &&
++ seg.ident.name == sym::from
++ {
++ match arg.kind {
++ ExprKind::Lit(hir::Lit {
++ node: LitKind::Str(ref sym, _),
++ ..
++ }) => return sym.is_empty() && is_path_diagnostic_item(cx, ty, sym::String),
++ ExprKind::Array([]) => return is_path_diagnostic_item(cx, ty, sym::Vec),
++ ExprKind::Repeat(_, ArrayLen::Body(len)) => {
++ if let ExprKind::Lit(ref const_lit) = cx.tcx.hir().body(len.body).value.kind &&
++ let LitKind::Int(v, _) = const_lit.node
++ {
++ return v == 0 && is_path_diagnostic_item(cx, ty, sym::Vec);
++ }
++ }
++ _ => (),
++ }
++ }
++ false
++}
++
+/// Checks if the top level expression can be moved into a closure as is.
+/// Currently checks for:
+/// * Break/Continue outside the given loop HIR ids.
+/// * Yield/Return statements.
+/// * Inline assembly.
+/// * Usages of a field of a local where the type of the local can be partially moved.
+///
+/// For example, given the following function:
+///
+/// ```
+/// fn f<'a>(iter: &mut impl Iterator<Item = (usize, &'a mut String)>) {
+/// for item in iter {
+/// let s = item.1;
+/// if item.0 > 10 {
+/// continue;
+/// } else {
+/// s.clear();
+/// }
+/// }
+/// }
+/// ```
+///
+/// When called on the expression `item.0` this will return false unless the local `item` is in the
+/// `ignore_locals` set. The type `(usize, &mut String)` can have the second element moved, so it
+/// isn't always safe to move into a closure when only a single field is needed.
+///
+/// When called on the `continue` expression this will return false unless the outer loop expression
+/// is in the `loop_ids` set.
+///
+/// Note that this check is not recursive, so passing the `if` expression will always return true
+/// even though sub-expressions might return false.
+pub fn can_move_expr_to_closure_no_visit<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ loop_ids: &[HirId],
+ ignore_locals: &HirIdSet,
+) -> bool {
+ match expr.kind {
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _)
+ | ExprKind::Continue(Destination { target_id: Ok(id), .. })
+ if loop_ids.contains(&id) =>
+ {
+ true
+ },
+ ExprKind::Break(..)
+ | ExprKind::Continue(_)
+ | ExprKind::Ret(_)
+ | ExprKind::Yield(..)
+ | ExprKind::InlineAsm(_) => false,
+ // Accessing a field of a local value can only be done if the type isn't
+ // partially moved.
+ ExprKind::Field(
+ &Expr {
+ hir_id,
+ kind:
+ ExprKind::Path(QPath::Resolved(
+ _,
+ Path {
+ res: Res::Local(local_id),
+ ..
+ },
+ )),
+ ..
+ },
+ _,
+ ) if !ignore_locals.contains(local_id) && can_partially_move_ty(cx, cx.typeck_results().node_type(hir_id)) => {
+ // TODO: check if the local has been partially moved. Assume it has for now.
+ false
+ },
+ _ => true,
+ }
+}
+
+/// How a local is captured by a closure
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CaptureKind {
+ Value,
+ Ref(Mutability),
+}
+impl CaptureKind {
+ pub fn is_imm_ref(self) -> bool {
+ self == Self::Ref(Mutability::Not)
+ }
+}
+impl std::ops::BitOr for CaptureKind {
+ type Output = Self;
+ fn bitor(self, rhs: Self) -> Self::Output {
+ match (self, rhs) {
+ (CaptureKind::Value, _) | (_, CaptureKind::Value) => CaptureKind::Value,
+ (CaptureKind::Ref(Mutability::Mut), CaptureKind::Ref(_))
+ | (CaptureKind::Ref(_), CaptureKind::Ref(Mutability::Mut)) => CaptureKind::Ref(Mutability::Mut),
+ (CaptureKind::Ref(Mutability::Not), CaptureKind::Ref(Mutability::Not)) => CaptureKind::Ref(Mutability::Not),
+ }
+ }
+}
+impl std::ops::BitOrAssign for CaptureKind {
+ fn bitor_assign(&mut self, rhs: Self) {
+ *self = *self | rhs;
+ }
+}
+
+/// Given an expression referencing a local, determines how it would be captured in a closure.
+/// Note as this will walk up to parent expressions until the capture can be determined it should
+/// only be used while making a closure somewhere a value is consumed. e.g. a block, match arm, or
+/// function argument (other than a receiver).
+pub fn capture_local_usage<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind {
+ fn pat_capture_kind(cx: &LateContext<'_>, pat: &Pat<'_>) -> CaptureKind {
+ let mut capture = CaptureKind::Ref(Mutability::Not);
+ pat.each_binding_or_first(&mut |_, id, span, _| match cx
+ .typeck_results()
+ .extract_binding_mode(cx.sess(), id, span)
+ .unwrap()
+ {
+ BindingMode::BindByValue(_) if !is_copy(cx, cx.typeck_results().node_type(id)) => {
+ capture = CaptureKind::Value;
+ },
+ BindingMode::BindByReference(Mutability::Mut) if capture != CaptureKind::Value => {
+ capture = CaptureKind::Ref(Mutability::Mut);
+ },
+ _ => (),
+ });
+ capture
+ }
+
+ debug_assert!(matches!(
+ e.kind,
+ ExprKind::Path(QPath::Resolved(None, Path { res: Res::Local(_), .. }))
+ ));
+
+ let mut child_id = e.hir_id;
+ let mut capture = CaptureKind::Value;
+ let mut capture_expr_ty = e;
+
+ for (parent_id, parent) in cx.tcx.hir().parent_iter(e.hir_id) {
+ if let [
+ Adjustment {
+ kind: Adjust::Deref(_) | Adjust::Borrow(AutoBorrow::Ref(..)),
+ target,
+ },
+ ref adjust @ ..,
+ ] = *cx
+ .typeck_results()
+ .adjustments()
+ .get(child_id)
+ .map_or(&[][..], |x| &**x)
+ {
+ if let rustc_ty::RawPtr(TypeAndMut { mutbl: mutability, .. }) | rustc_ty::Ref(_, _, mutability) =
+ *adjust.last().map_or(target, |a| a.target).kind()
+ {
+ return CaptureKind::Ref(mutability);
+ }
+ }
+
+ match parent {
+ Node::Expr(e) => match e.kind {
+ ExprKind::AddrOf(_, mutability, _) => return CaptureKind::Ref(mutability),
+ ExprKind::Index(..) | ExprKind::Unary(UnOp::Deref, _) => capture = CaptureKind::Ref(Mutability::Not),
+ ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) if lhs.hir_id == child_id => {
+ return CaptureKind::Ref(Mutability::Mut);
+ },
+ ExprKind::Field(..) => {
+ if capture == CaptureKind::Value {
+ capture_expr_ty = e;
+ }
+ },
+ ExprKind::Let(let_expr) => {
+ let mutability = match pat_capture_kind(cx, let_expr.pat) {
+ CaptureKind::Value => Mutability::Not,
+ CaptureKind::Ref(m) => m,
+ };
+ return CaptureKind::Ref(mutability);
+ },
+ ExprKind::Match(_, arms, _) => {
+ let mut mutability = Mutability::Not;
+ for capture in arms.iter().map(|arm| pat_capture_kind(cx, arm.pat)) {
+ match capture {
+ CaptureKind::Value => break,
+ CaptureKind::Ref(Mutability::Mut) => mutability = Mutability::Mut,
+ CaptureKind::Ref(Mutability::Not) => (),
+ }
+ }
+ return CaptureKind::Ref(mutability);
+ },
+ _ => break,
+ },
+ Node::Local(l) => match pat_capture_kind(cx, l.pat) {
+ CaptureKind::Value => break,
+ capture @ CaptureKind::Ref(_) => return capture,
+ },
+ _ => break,
+ }
+
+ child_id = parent_id;
+ }
+
+ if capture == CaptureKind::Value && is_copy(cx, cx.typeck_results().expr_ty(capture_expr_ty)) {
+ // Copy types are never automatically captured by value.
+ CaptureKind::Ref(Mutability::Not)
+ } else {
+ capture
+ }
+}
+
+/// Checks if the expression can be moved into a closure as is. This will return a list of captures
+/// if so, otherwise, `None`.
+pub fn can_move_expr_to_closure<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<HirIdMap<CaptureKind>> {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ // Stack of potential break targets contained in the expression.
+ loops: Vec<HirId>,
+ /// Local variables created in the expression. These don't need to be captured.
+ locals: HirIdSet,
+ /// Whether this expression can be turned into a closure.
+ allow_closure: bool,
+ /// Locals which need to be captured, and whether they need to be by value, reference, or
+ /// mutable reference.
+ captures: HirIdMap<CaptureKind>,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !self.allow_closure {
+ return;
+ }
+
+ match e.kind {
+ ExprKind::Path(QPath::Resolved(None, &Path { res: Res::Local(l), .. })) => {
+ if !self.locals.contains(&l) {
+ let cap = capture_local_usage(self.cx, e);
+ self.captures.entry(l).and_modify(|e| *e |= cap).or_insert(cap);
+ }
+ },
+ ExprKind::Closure { .. } => {
+ let closure_id = self.cx.tcx.hir().local_def_id(e.hir_id);
+ for capture in self.cx.typeck_results().closure_min_captures_flattened(closure_id) {
+ let local_id = match capture.place.base {
+ PlaceBase::Local(id) => id,
+ PlaceBase::Upvar(var) => var.var_path.hir_id,
+ _ => continue,
+ };
+ if !self.locals.contains(&local_id) {
+ let capture = match capture.info.capture_kind {
+ UpvarCapture::ByValue => CaptureKind::Value,
+ UpvarCapture::ByRef(kind) => match kind {
+ BorrowKind::ImmBorrow => CaptureKind::Ref(Mutability::Not),
+ BorrowKind::UniqueImmBorrow | BorrowKind::MutBorrow => {
+ CaptureKind::Ref(Mutability::Mut)
+ },
+ },
+ };
+ self.captures
+ .entry(local_id)
+ .and_modify(|e| *e |= capture)
+ .or_insert(capture);
+ }
+ }
+ },
+ ExprKind::Loop(b, ..) => {
+ self.loops.push(e.hir_id);
+ self.visit_block(b);
+ self.loops.pop();
+ },
+ _ => {
+ self.allow_closure &= can_move_expr_to_closure_no_visit(self.cx, e, &self.loops, &self.locals);
+ walk_expr(self, e);
+ },
+ }
+ }
+
+ fn visit_pat(&mut self, p: &'tcx Pat<'tcx>) {
+ p.each_binding_or_first(&mut |_, id, _, _| {
+ self.locals.insert(id);
+ });
+ }
+ }
+
+ let mut v = V {
+ cx,
+ allow_closure: true,
+ loops: Vec::new(),
+ locals: HirIdSet::default(),
+ captures: HirIdMap::default(),
+ };
+ v.visit_expr(expr);
+ v.allow_closure.then_some(v.captures)
+}
+
+/// Arguments of a method: the receiver and all the additional arguments.
+pub type MethodArguments<'tcx> = Vec<(&'tcx Expr<'tcx>, &'tcx [Expr<'tcx>])>;
+
+/// Returns the method names and argument list of nested method call expressions that make up
+/// `expr`. method/span lists are sorted with the most recent call first.
+pub fn method_calls<'tcx>(expr: &'tcx Expr<'tcx>, max_depth: usize) -> (Vec<Symbol>, MethodArguments<'tcx>, Vec<Span>) {
+ let mut method_names = Vec::with_capacity(max_depth);
+ let mut arg_lists = Vec::with_capacity(max_depth);
+ let mut spans = Vec::with_capacity(max_depth);
+
+ let mut current = expr;
+ for _ in 0..max_depth {
+ if let ExprKind::MethodCall(path, receiver, args, _) = ¤t.kind {
+ if receiver.span.from_expansion() || args.iter().any(|e| e.span.from_expansion()) {
+ break;
+ }
+ method_names.push(path.ident.name);
+ arg_lists.push((*receiver, &**args));
+ spans.push(path.ident.span);
+ current = receiver;
+ } else {
+ break;
+ }
+ }
+
+ (method_names, arg_lists, spans)
+}
+
+/// Matches an `Expr` against a chain of methods, and return the matched `Expr`s.
+///
+/// For example, if `expr` represents the `.baz()` in `foo.bar().baz()`,
+/// `method_chain_args(expr, &["bar", "baz"])` will return a `Vec`
+/// containing the `Expr`s for
+/// `.bar()` and `.baz()`
+pub fn method_chain_args<'a>(expr: &'a Expr<'_>, methods: &[&str]) -> Option<Vec<(&'a Expr<'a>, &'a [Expr<'a>])>> {
+ let mut current = expr;
+ let mut matched = Vec::with_capacity(methods.len());
+ for method_name in methods.iter().rev() {
+ // method chains are stored last -> first
+ if let ExprKind::MethodCall(path, receiver, args, _) = current.kind {
+ if path.ident.name.as_str() == *method_name {
+ if receiver.span.from_expansion() || args.iter().any(|e| e.span.from_expansion()) {
+ return None;
+ }
+ matched.push((receiver, args)); // build up `matched` backwards
+ current = receiver; // go to parent expression
+ } else {
+ return None;
+ }
+ } else {
+ return None;
+ }
+ }
+ // Reverse `matched` so that it is in the same order as `methods`.
+ matched.reverse();
+ Some(matched)
+}
+
+/// Returns `true` if the provided `def_id` is an entrypoint to a program.
+pub fn is_entrypoint_fn(cx: &LateContext<'_>, def_id: DefId) -> bool {
+ cx.tcx
+ .entry_fn(())
+ .map_or(false, |(entry_fn_def_id, _)| def_id == entry_fn_def_id)
+}
+
+/// Returns `true` if the expression is in the program's `#[panic_handler]`.
+pub fn is_in_panic_handler(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ let parent = cx.tcx.hir().get_parent_item(e.hir_id);
+ Some(parent.to_def_id()) == cx.tcx.lang_items().panic_impl()
+}
+
+/// Gets the name of the item the expression is in, if available.
+pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Symbol> {
+ let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id).def_id;
+ match cx.tcx.hir().find_by_def_id(parent_id) {
+ Some(
+ Node::Item(Item { ident, .. })
+ | Node::TraitItem(TraitItem { ident, .. })
+ | Node::ImplItem(ImplItem { ident, .. }),
+ ) => Some(ident.name),
+ _ => None,
+ }
+}
+
+pub struct ContainsName {
+ pub name: Symbol,
+ pub result: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for ContainsName {
+ fn visit_name(&mut self, name: Symbol) {
+ if self.name == name {
+ self.result = true;
+ }
+ }
+}
+
+/// Checks if an `Expr` contains a certain name.
+pub fn contains_name(name: Symbol, expr: &Expr<'_>) -> bool {
+ let mut cn = ContainsName { name, result: false };
+ cn.visit_expr(expr);
+ cn.result
+}
+
+/// Returns `true` if `expr` contains a return expression
+pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
+ for_each_expr(expr, |e| {
+ if matches!(e.kind, hir::ExprKind::Ret(..)) {
+ ControlFlow::Break(())
+ } else {
+ ControlFlow::Continue(())
+ }
+ })
+ .is_some()
+}
+
+/// Extends the span to the beginning of the spans line, incl. whitespaces.
+///
+/// ```rust
+/// let x = ();
+/// // ^^
+/// // will be converted to
+/// let x = ();
+/// // ^^^^^^^^^^^^^^
+/// ```
+fn line_span<T: LintContext>(cx: &T, span: Span) -> Span {
+ let span = original_sp(span, DUMMY_SP);
+ let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
+ let line_no = source_map_and_line.line;
+ let line_start = source_map_and_line.sf.lines(|lines| lines[line_no]);
+ span.with_lo(line_start)
+}
+
+/// Gets the parent node, if any.
+pub fn get_parent_node(tcx: TyCtxt<'_>, id: HirId) -> Option<Node<'_>> {
+ tcx.hir().parent_iter(id).next().map(|(_, node)| node)
+}
+
+/// Gets the parent expression, if any –- this is useful to constrain a lint.
+pub fn get_parent_expr<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+ get_parent_expr_for_hir(cx, e.hir_id)
+}
+
+/// This retrieves the parent for the given `HirId` if it's an expression. This is useful for
+/// constraint lints
+pub fn get_parent_expr_for_hir<'tcx>(cx: &LateContext<'tcx>, hir_id: hir::HirId) -> Option<&'tcx Expr<'tcx>> {
+ match get_parent_node(cx.tcx, hir_id) {
+ Some(Node::Expr(parent)) => Some(parent),
+ _ => None,
+ }
+}
+
+pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Block<'tcx>> {
+ let map = &cx.tcx.hir();
+ let enclosing_node = map
+ .get_enclosing_scope(hir_id)
+ .and_then(|enclosing_id| map.find(enclosing_id));
+ enclosing_node.and_then(|node| match node {
+ Node::Block(block) => Some(block),
+ Node::Item(&Item {
+ kind: ItemKind::Fn(_, _, eid),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(_, eid),
+ ..
+ }) => match cx.tcx.hir().body(eid).value.kind {
+ ExprKind::Block(block, _) => Some(block),
+ _ => None,
+ },
+ _ => None,
+ })
+}
+
+/// Gets the loop or closure enclosing the given expression, if any.
+pub fn get_enclosing_loop_or_multi_call_closure<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &Expr<'_>,
+) -> Option<&'tcx Expr<'tcx>> {
+ for (_, node) in cx.tcx.hir().parent_iter(expr.hir_id) {
+ match node {
+ Node::Expr(e) => match e.kind {
+ ExprKind::Closure { .. } => {
+ if let rustc_ty::Closure(_, subs) = cx.typeck_results().expr_ty(e).kind()
+ && subs.as_closure().kind() == ClosureKind::FnOnce
+ {
+ continue;
+ }
+ let is_once = walk_to_expr_usage(cx, e, |node, id| {
+ let Node::Expr(e) = node else {
+ return None;
+ };
+ match e.kind {
+ ExprKind::Call(f, _) if f.hir_id == id => Some(()),
+ ExprKind::Call(f, args) => {
+ let i = args.iter().position(|arg| arg.hir_id == id)?;
+ let sig = expr_sig(cx, f)?;
+ let predicates = sig
+ .predicates_id()
+ .map_or(cx.param_env, |id| cx.tcx.param_env(id))
+ .caller_bounds();
+ sig.input(i).and_then(|ty| {
+ ty_is_fn_once_param(cx.tcx, ty.skip_binder(), predicates).then_some(())
+ })
+ },
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ let i = std::iter::once(receiver)
+ .chain(args.iter())
+ .position(|arg| arg.hir_id == id)?;
+ let id = cx.typeck_results().type_dependent_def_id(e.hir_id)?;
+ let ty = cx.tcx.fn_sig(id).skip_binder().inputs()[i];
+ ty_is_fn_once_param(cx.tcx, ty, cx.tcx.param_env(id).caller_bounds()).then_some(())
+ },
+ _ => None,
+ }
+ })
+ .is_some();
+ if !is_once {
+ return Some(e);
+ }
+ },
+ ExprKind::Loop(..) => return Some(e),
+ _ => (),
+ },
+ Node::Stmt(_) | Node::Block(_) | Node::Local(_) | Node::Arm(_) => (),
+ _ => break,
+ }
+ }
+ None
+}
+
+/// Gets the parent node if it's an impl block.
+pub fn get_parent_as_impl(tcx: TyCtxt<'_>, id: HirId) -> Option<&Impl<'_>> {
+ match tcx.hir().parent_iter(id).next() {
+ Some((
+ _,
+ Node::Item(Item {
+ kind: ItemKind::Impl(imp),
+ ..
+ }),
+ )) => Some(imp),
+ _ => None,
+ }
+}
+
+/// Removes blocks around an expression, only if the block contains just one expression
+/// and no statements. Unsafe blocks are not removed.
+///
+/// Examples:
+/// * `{}` -> `{}`
+/// * `{ x }` -> `x`
+/// * `{{ x }}` -> `x`
+/// * `{ x; }` -> `{ x; }`
+/// * `{ x; y }` -> `{ x; y }`
+/// * `{ unsafe { x } }` -> `unsafe { x }`
+pub fn peel_blocks<'a>(mut expr: &'a Expr<'a>) -> &'a Expr<'a> {
+ while let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: Some(inner),
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ },
+ _,
+ ) = expr.kind
+ {
+ expr = inner;
+ }
+ expr
+}
+
+/// Removes blocks around an expression, only if the block contains just one expression
+/// or just one expression statement with a semicolon. Unsafe blocks are not removed.
+///
+/// Examples:
+/// * `{}` -> `{}`
+/// * `{ x }` -> `x`
+/// * `{ x; }` -> `x`
+/// * `{{ x; }}` -> `x`
+/// * `{ x; y }` -> `{ x; y }`
+/// * `{ unsafe { x } }` -> `unsafe { x }`
+pub fn peel_blocks_with_stmt<'a>(mut expr: &'a Expr<'a>) -> &'a Expr<'a> {
+ while let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: Some(inner),
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ }
+ | Block {
+ stmts:
+ [
+ Stmt {
+ kind: StmtKind::Expr(inner) | StmtKind::Semi(inner),
+ ..
+ },
+ ],
+ expr: None,
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ },
+ _,
+ ) = expr.kind
+ {
+ expr = inner;
+ }
+ expr
+}
+
+/// Checks if the given expression is the else clause of either an `if` or `if let` expression.
+pub fn is_else_clause(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ let mut iter = tcx.hir().parent_iter(expr.hir_id);
+ match iter.next() {
+ Some((
+ _,
+ Node::Expr(Expr {
+ kind: ExprKind::If(_, _, Some(else_expr)),
+ ..
+ }),
+ )) => else_expr.hir_id == expr.hir_id,
+ _ => false,
+ }
+}
+
+/// Checks whether the given expression is a constant integer of the given value.
+/// unlike `is_integer_literal`, this version does const folding
+pub fn is_integer_const(cx: &LateContext<'_>, e: &Expr<'_>, value: u128) -> bool {
+ if is_integer_literal(e, value) {
+ return true;
+ }
+ let enclosing_body = cx.tcx.hir().enclosing_body_owner(e.hir_id);
+ if let Some((Constant::Int(v), _)) = constant(cx, cx.tcx.typeck(enclosing_body), e) {
+ return value == v;
+ }
+ false
+}
+
+/// Checks whether the given expression is a constant literal of the given value.
+pub fn is_integer_literal(expr: &Expr<'_>, value: u128) -> bool {
+ // FIXME: use constant folding
+ if let ExprKind::Lit(ref spanned) = expr.kind {
+ if let LitKind::Int(v, _) = spanned.node {
+ return v == value;
+ }
+ }
+ false
+}
+
+/// Returns `true` if the given `Expr` has been coerced before.
+///
+/// Examples of coercions can be found in the Nomicon at
+/// <https://doc.rust-lang.org/nomicon/coercions.html>.
+///
+/// See `rustc_middle::ty::adjustment::Adjustment` and `rustc_hir_analysis::check::coercion` for
+/// more information on adjustments and coercions.
+pub fn is_adjusted(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ cx.typeck_results().adjustments().get(e.hir_id).is_some()
+}
+
+/// Returns the pre-expansion span if this comes from an expansion of the
+/// macro `name`.
+/// See also [`is_direct_expn_of`].
+#[must_use]
+pub fn is_expn_of(mut span: Span, name: &str) -> Option<Span> {
+ loop {
+ if span.from_expansion() {
+ let data = span.ctxt().outer_expn_data();
+ let new_span = data.call_site;
+
+ if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
+ if mac_name.as_str() == name {
+ return Some(new_span);
+ }
+ }
+
+ span = new_span;
+ } else {
+ return None;
+ }
+ }
+}
+
+/// Returns the pre-expansion span if the span directly comes from an expansion
+/// of the macro `name`.
+/// The difference with [`is_expn_of`] is that in
+/// ```rust
+/// # macro_rules! foo { ($name:tt!$args:tt) => { $name!$args } }
+/// # macro_rules! bar { ($e:expr) => { $e } }
+/// foo!(bar!(42));
+/// ```
+/// `42` is considered expanded from `foo!` and `bar!` by `is_expn_of` but only
+/// from `bar!` by `is_direct_expn_of`.
+#[must_use]
+pub fn is_direct_expn_of(span: Span, name: &str) -> Option<Span> {
+ if span.from_expansion() {
+ let data = span.ctxt().outer_expn_data();
+ let new_span = data.call_site;
+
+ if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
+ if mac_name.as_str() == name {
+ return Some(new_span);
+ }
+ }
+ }
+
+ None
+}
+
+/// Convenience function to get the return type of a function.
+pub fn return_ty<'tcx>(cx: &LateContext<'tcx>, fn_item: hir::HirId) -> Ty<'tcx> {
+ let fn_def_id = cx.tcx.hir().local_def_id(fn_item);
+ let ret_ty = cx.tcx.fn_sig(fn_def_id).output();
+ cx.tcx.erase_late_bound_regions(ret_ty)
+}
+
+/// Convenience function to get the nth argument type of a function.
+pub fn nth_arg<'tcx>(cx: &LateContext<'tcx>, fn_item: hir::HirId, nth: usize) -> Ty<'tcx> {
+ let fn_def_id = cx.tcx.hir().local_def_id(fn_item);
+ let arg = cx.tcx.fn_sig(fn_def_id).input(nth);
+ cx.tcx.erase_late_bound_regions(arg)
+}
+
+/// Checks if an expression is constructing a tuple-like enum variant or struct
+pub fn is_ctor_or_promotable_const_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ if let ExprKind::Call(fun, _) = expr.kind {
+ if let ExprKind::Path(ref qp) = fun.kind {
+ let res = cx.qpath_res(qp, fun.hir_id);
+ return match res {
+ def::Res::Def(DefKind::Variant | DefKind::Ctor(..), ..) => true,
+ def::Res::Def(_, def_id) => cx.tcx.is_promotable_const_fn(def_id),
+ _ => false,
+ };
+ }
+ }
+ false
+}
+
+/// Returns `true` if a pattern is refutable.
+// TODO: should be implemented using rustc/mir_build/thir machinery
+pub fn is_refutable(cx: &LateContext<'_>, pat: &Pat<'_>) -> bool {
+ fn is_enum_variant(cx: &LateContext<'_>, qpath: &QPath<'_>, id: HirId) -> bool {
+ matches!(
+ cx.qpath_res(qpath, id),
+ def::Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(def::CtorOf::Variant, _), _)
+ )
+ }
+
+ fn are_refutable<'a, I: IntoIterator<Item = &'a Pat<'a>>>(cx: &LateContext<'_>, i: I) -> bool {
+ i.into_iter().any(|pat| is_refutable(cx, pat))
+ }
+
+ match pat.kind {
+ PatKind::Wild => false,
+ PatKind::Binding(_, _, _, pat) => pat.map_or(false, |pat| is_refutable(cx, pat)),
+ PatKind::Box(pat) | PatKind::Ref(pat, _) => is_refutable(cx, pat),
+ PatKind::Lit(..) | PatKind::Range(..) => true,
+ PatKind::Path(ref qpath) => is_enum_variant(cx, qpath, pat.hir_id),
+ PatKind::Or(pats) => {
+ // TODO: should be the honest check, that pats is exhaustive set
+ are_refutable(cx, pats)
+ },
+ PatKind::Tuple(pats, _) => are_refutable(cx, pats),
+ PatKind::Struct(ref qpath, fields, _) => {
+ is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, fields.iter().map(|field| field.pat))
+ },
+ PatKind::TupleStruct(ref qpath, pats, _) => is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, pats),
+ PatKind::Slice(head, middle, tail) => {
+ match &cx.typeck_results().node_type(pat.hir_id).kind() {
+ rustc_ty::Slice(..) => {
+ // [..] is the only irrefutable slice pattern.
+ !head.is_empty() || middle.is_none() || !tail.is_empty()
+ },
+ rustc_ty::Array(..) => are_refutable(cx, head.iter().chain(middle).chain(tail.iter())),
+ _ => {
+ // unreachable!()
+ true
+ },
+ }
+ },
+ }
+}
+
+/// If the pattern is an `or` pattern, call the function once for each sub pattern. Otherwise, call
+/// the function once on the given pattern.
+pub fn recurse_or_patterns<'tcx, F: FnMut(&'tcx Pat<'tcx>)>(pat: &'tcx Pat<'tcx>, mut f: F) {
+ if let PatKind::Or(pats) = pat.kind {
+ pats.iter().for_each(f);
+ } else {
+ f(pat);
+ }
+}
+
+pub fn is_self(slf: &Param<'_>) -> bool {
+ if let PatKind::Binding(.., name, _) = slf.pat.kind {
+ name.name == kw::SelfLower
+ } else {
+ false
+ }
+}
+
+pub fn is_self_ty(slf: &hir::Ty<'_>) -> bool {
+ if let TyKind::Path(QPath::Resolved(None, path)) = slf.kind {
+ if let Res::SelfTyParam { .. } | Res::SelfTyAlias { .. } = path.res {
+ return true;
+ }
+ }
+ false
+}
+
+pub fn iter_input_pats<'tcx>(decl: &FnDecl<'_>, body: &'tcx Body<'_>) -> impl Iterator<Item = &'tcx Param<'tcx>> {
+ (0..decl.inputs.len()).map(move |i| &body.params[i])
+}
+
+/// Checks if a given expression is a match expression expanded from the `?`
+/// operator or the `try` macro.
+pub fn is_try<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
+ fn is_ok(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ if_chain! {
+ if let PatKind::TupleStruct(ref path, pat, ddpos) = arm.pat.kind;
+ if ddpos.as_opt_usize().is_none();
+ if is_res_lang_ctor(cx, cx.qpath_res(path, arm.pat.hir_id), ResultOk);
+ if let PatKind::Binding(_, hir_id, _, None) = pat[0].kind;
+ if path_to_local_id(arm.body, hir_id);
+ then {
+ return true;
+ }
+ }
+ false
+ }
+
+ fn is_err(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ if let PatKind::TupleStruct(ref path, _, _) = arm.pat.kind {
+ is_res_lang_ctor(cx, cx.qpath_res(path, arm.pat.hir_id), ResultErr)
+ } else {
+ false
+ }
+ }
+
+ if let ExprKind::Match(_, arms, ref source) = expr.kind {
+ // desugared from a `?` operator
+ if *source == MatchSource::TryDesugar {
+ return Some(expr);
+ }
+
+ if_chain! {
+ if arms.len() == 2;
+ if arms[0].guard.is_none();
+ if arms[1].guard.is_none();
+ if (is_ok(cx, &arms[0]) && is_err(cx, &arms[1])) || (is_ok(cx, &arms[1]) && is_err(cx, &arms[0]));
+ then {
+ return Some(expr);
+ }
+ }
+ }
+
+ None
+}
+
+/// Returns `true` if the lint is allowed in the current context. This is useful for
+/// skipping long running code when it's unnecessary
+///
+/// This function should check the lint level for the same node, that the lint will
+/// be emitted at. If the information is buffered to be emitted at a later point, please
+/// make sure to use `span_lint_hir` functions to emit the lint. This ensures that
+/// expectations at the checked nodes will be fulfilled.
+pub fn is_lint_allowed(cx: &LateContext<'_>, lint: &'static Lint, id: HirId) -> bool {
+ cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow
+}
+
+pub fn strip_pat_refs<'hir>(mut pat: &'hir Pat<'hir>) -> &'hir Pat<'hir> {
+ while let PatKind::Ref(subpat, _) = pat.kind {
+ pat = subpat;
+ }
+ pat
+}
+
+pub fn int_bits(tcx: TyCtxt<'_>, ity: rustc_ty::IntTy) -> u64 {
+ Integer::from_int_ty(&tcx, ity).size().bits()
+}
+
+#[expect(clippy::cast_possible_wrap)]
+/// Turn a constant int byte representation into an i128
+pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::IntTy) -> i128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as i128) << amt) >> amt
+}
+
+#[expect(clippy::cast_sign_loss)]
+/// clip unused bytes
+pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: rustc_ty::IntTy) -> u128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as u128) << amt) >> amt
+}
+
+/// clip unused bytes
+pub fn clip(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::UintTy) -> u128 {
+ let bits = Integer::from_uint_ty(&tcx, ity).size().bits();
+ let amt = 128 - bits;
+ (u << amt) >> amt
+}
+
+pub fn has_attr(attrs: &[ast::Attribute], symbol: Symbol) -> bool {
+ attrs.iter().any(|attr| attr.has_name(symbol))
+}
+
+pub fn any_parent_has_attr(tcx: TyCtxt<'_>, node: HirId, symbol: Symbol) -> bool {
+ let map = &tcx.hir();
+ let mut prev_enclosing_node = None;
+ let mut enclosing_node = node;
+ while Some(enclosing_node) != prev_enclosing_node {
+ if has_attr(map.attrs(enclosing_node), symbol) {
+ return true;
+ }
+ prev_enclosing_node = Some(enclosing_node);
+ enclosing_node = map.get_parent_item(enclosing_node).into();
+ }
+
+ false
+}
+
+pub fn any_parent_is_automatically_derived(tcx: TyCtxt<'_>, node: HirId) -> bool {
+ any_parent_has_attr(tcx, node, sym::automatically_derived)
+}
+
+/// Matches a function call with the given path and returns the arguments.
+///
+/// Usage:
+///
+/// ```rust,ignore
+/// if let Some(args) = match_function_call(cx, cmp_max_call, &paths::CMP_MAX);
+/// ```
++/// This function is deprecated. Use [`match_function_call_with_def_id`].
+pub fn match_function_call<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ path: &[&str],
+) -> Option<&'tcx [Expr<'tcx>]> {
+ if_chain! {
+ if let ExprKind::Call(fun, args) = expr.kind;
+ if let ExprKind::Path(ref qpath) = fun.kind;
+ if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
+ if match_def_path(cx, fun_def_id, path);
+ then {
+ return Some(args);
+ }
+ };
+ None
+}
+
++pub fn match_function_call_with_def_id<'tcx>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx Expr<'_>,
++ fun_def_id: DefId,
++) -> Option<&'tcx [Expr<'tcx>]> {
++ if_chain! {
++ if let ExprKind::Call(fun, args) = expr.kind;
++ if let ExprKind::Path(ref qpath) = fun.kind;
++ if cx.qpath_res(qpath, fun.hir_id).opt_def_id() == Some(fun_def_id);
++ then {
++ return Some(args);
++ }
++ };
++ None
++}
++
+/// Checks if the given `DefId` matches any of the paths. Returns the index of matching path, if
+/// any.
+///
+/// Please use `tcx.get_diagnostic_name` if the targets are all diagnostic items.
+pub fn match_any_def_paths(cx: &LateContext<'_>, did: DefId, paths: &[&[&str]]) -> Option<usize> {
+ let search_path = cx.get_def_path(did);
+ paths
+ .iter()
+ .position(|p| p.iter().map(|x| Symbol::intern(x)).eq(search_path.iter().copied()))
+}
+
+/// Checks if the given `DefId` matches the path.
+pub fn match_def_path<'tcx>(cx: &LateContext<'tcx>, did: DefId, syms: &[&str]) -> bool {
+ // We should probably move to Symbols in Clippy as well rather than interning every time.
+ let path = cx.get_def_path(did);
+ syms.iter().map(|x| Symbol::intern(x)).eq(path.iter().copied())
+}
+
+/// Checks if the given `DefId` matches the `libc` item.
+pub fn match_libc_symbol(cx: &LateContext<'_>, did: DefId, name: &str) -> bool {
+ let path = cx.get_def_path(did);
+ // libc is meant to be used as a flat list of names, but they're all actually defined in different
+ // modules based on the target platform. Ignore everything but crate name and the item name.
+ path.first().map_or(false, |s| s.as_str() == "libc") && path.last().map_or(false, |s| s.as_str() == name)
+}
+
+/// Returns the list of condition expressions and the list of blocks in a
+/// sequence of `if/else`.
+/// E.g., this returns `([a, b], [c, d, e])` for the expression
+/// `if a { c } else if b { d } else { e }`.
+pub fn if_sequence<'tcx>(mut expr: &'tcx Expr<'tcx>) -> (Vec<&'tcx Expr<'tcx>>, Vec<&'tcx Block<'tcx>>) {
+ let mut conds = Vec::new();
+ let mut blocks: Vec<&Block<'_>> = Vec::new();
+
+ while let Some(higher::IfOrIfLet { cond, then, r#else }) = higher::IfOrIfLet::hir(expr) {
+ conds.push(cond);
+ if let ExprKind::Block(block, _) = then.kind {
+ blocks.push(block);
+ } else {
+ panic!("ExprKind::If node is not an ExprKind::Block");
+ }
+
+ if let Some(else_expr) = r#else {
+ expr = else_expr;
+ } else {
+ break;
+ }
+ }
+
+ // final `else {..}`
+ if !blocks.is_empty() {
+ if let ExprKind::Block(block, _) = expr.kind {
+ blocks.push(block);
+ }
+ }
+
+ (conds, blocks)
+}
+
+/// Checks if the given function kind is an async function.
+pub fn is_async_fn(kind: FnKind<'_>) -> bool {
+ matches!(kind, FnKind::ItemFn(_, _, header) if header.asyncness == IsAsync::Async)
+}
+
+/// Peels away all the compiler generated code surrounding the body of an async function,
+pub fn get_async_fn_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Option<&'tcx Expr<'tcx>> {
+ if let ExprKind::Call(
+ _,
+ &[
+ Expr {
+ kind: ExprKind::Closure(&Closure { body, .. }),
+ ..
+ },
+ ],
+ ) = body.value.kind
+ {
+ if let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr:
+ Some(Expr {
+ kind: ExprKind::DropTemps(expr),
+ ..
+ }),
+ ..
+ },
+ _,
+ ) = tcx.hir().body(body).value.kind
+ {
+ return Some(expr);
+ }
+ };
+ None
+}
+
+// check if expr is calling method or function with #[must_use] attribute
+pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ let did = match expr.kind {
+ ExprKind::Call(path, _) => if_chain! {
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let def::Res::Def(_, did) = cx.qpath_res(qpath, path.hir_id);
+ then {
+ Some(did)
+ } else {
+ None
+ }
+ },
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ _ => None,
+ };
+
+ did.map_or(false, |did| cx.tcx.has_attr(did, sym::must_use))
+}
+
+/// Checks if an expression represents the identity function
+/// Only examines closures and `std::convert::identity`
+pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ /// Checks if a function's body represents the identity function. Looks for bodies of the form:
+ /// * `|x| x`
+ /// * `|x| return x`
+ /// * `|x| { return x }`
+ /// * `|x| { return x; }`
+ fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
+ let id = if_chain! {
+ if let [param] = func.params;
+ if let PatKind::Binding(_, id, _, _) = param.pat.kind;
+ then {
+ id
+ } else {
+ return false;
+ }
+ };
+
+ let mut expr = func.value;
+ loop {
+ match expr.kind {
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [], expr: Some(e), .. }, _, )
+ | ExprKind::Ret(Some(e)) => expr = e,
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [stmt], expr: None, .. }, _) => {
+ if_chain! {
+ if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
+ if let ExprKind::Ret(Some(ret_val)) = e.kind;
+ then {
+ expr = ret_val;
+ } else {
+ return false;
+ }
+ }
+ },
+ _ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
+ }
+ }
+ }
+
+ match expr.kind {
+ ExprKind::Closure(&Closure { body, .. }) => is_body_identity_function(cx, cx.tcx.hir().body(body)),
+ _ => path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, &paths::CONVERT_IDENTITY)),
+ }
+}
+
+/// Gets the node where an expression is either used, or it's type is unified with another branch.
+/// Returns both the node and the `HirId` of the closest child node.
+pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<(Node<'tcx>, HirId)> {
+ let mut child_id = expr.hir_id;
+ let mut iter = tcx.hir().parent_iter(child_id);
+ loop {
+ match iter.next() {
+ None => break None,
+ Some((id, Node::Block(_))) => child_id = id,
+ Some((id, Node::Arm(arm))) if arm.body.hir_id == child_id => child_id = id,
+ Some((_, Node::Expr(expr))) => match expr.kind {
+ ExprKind::Match(_, [arm], _) if arm.hir_id == child_id => child_id = expr.hir_id,
+ ExprKind::Block(..) | ExprKind::DropTemps(_) => child_id = expr.hir_id,
+ ExprKind::If(_, then_expr, None) if then_expr.hir_id == child_id => break None,
+ _ => break Some((Node::Expr(expr), child_id)),
+ },
+ Some((_, node)) => break Some((node, child_id)),
+ }
+ }
+}
+
+/// Checks if the result of an expression is used, or it's type is unified with another branch.
+pub fn is_expr_used_or_unified(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ !matches!(
+ get_expr_use_or_unification_node(tcx, expr),
+ None | Some((
+ Node::Stmt(Stmt {
+ kind: StmtKind::Expr(_)
+ | StmtKind::Semi(_)
+ | StmtKind::Local(Local {
+ pat: Pat {
+ kind: PatKind::Wild,
+ ..
+ },
+ ..
+ }),
+ ..
+ }),
+ _
+ ))
+ )
+}
+
+/// Checks if the expression is the final expression returned from a block.
+pub fn is_expr_final_block_expr(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ matches!(get_parent_node(tcx, expr.hir_id), Some(Node::Block(..)))
+}
+
+pub fn std_or_core(cx: &LateContext<'_>) -> Option<&'static str> {
+ if !is_no_std_crate(cx) {
+ Some("std")
+ } else if !is_no_core_crate(cx) {
+ Some("core")
+ } else {
+ None
+ }
+}
+
+pub fn is_no_std_crate(cx: &LateContext<'_>) -> bool {
+ cx.tcx.hir().attrs(hir::CRATE_HIR_ID).iter().any(|attr| {
+ if let ast::AttrKind::Normal(ref normal) = attr.kind {
+ normal.item.path == sym::no_std
+ } else {
+ false
+ }
+ })
+}
+
+pub fn is_no_core_crate(cx: &LateContext<'_>) -> bool {
+ cx.tcx.hir().attrs(hir::CRATE_HIR_ID).iter().any(|attr| {
+ if let ast::AttrKind::Normal(ref normal) = attr.kind {
+ normal.item.path == sym::no_core
+ } else {
+ false
+ }
+ })
+}
+
+/// Check if parent of a hir node is a trait implementation block.
+/// For example, `f` in
+/// ```rust
+/// # struct S;
+/// # trait Trait { fn f(); }
+/// impl Trait for S {
+/// fn f() {}
+/// }
+/// ```
+pub fn is_trait_impl_item(cx: &LateContext<'_>, hir_id: HirId) -> bool {
+ if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+ matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+ } else {
+ false
+ }
+}
+
+/// Check if it's even possible to satisfy the `where` clause for the item.
+///
+/// `trivial_bounds` feature allows functions with unsatisfiable bounds, for example:
+///
+/// ```ignore
+/// fn foo() where i32: Iterator {
+/// for _ in 2i32 {}
+/// }
+/// ```
+pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_>, did: DefId) -> bool {
+ use rustc_trait_selection::traits;
+ let predicates = cx
+ .tcx
+ .predicates_of(did)
+ .predicates
+ .iter()
+ .filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None });
+ traits::impossible_predicates(
+ cx.tcx,
+ traits::elaborate_predicates(cx.tcx, predicates)
+ .map(|o| o.predicate)
+ .collect::<Vec<_>>(),
+ )
+}
+
+/// Returns the `DefId` of the callee if the given expression is a function or method call.
+pub fn fn_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<DefId> {
+ match &expr.kind {
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(qpath),
+ hir_id: path_hir_id,
+ ..
+ },
+ ..,
+ ) => {
+ // Only return Fn-like DefIds, not the DefIds of statics/consts/etc that contain or
+ // deref to fn pointers, dyn Fn, impl Fn - #8850
+ if let Res::Def(DefKind::Fn | DefKind::Ctor(..) | DefKind::AssocFn, id) =
+ cx.typeck_results().qpath_res(qpath, *path_hir_id)
+ {
+ Some(id)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Returns `Option<String>` where String is a textual representation of the type encapsulated in
+/// the slice iff the given expression is a slice of primitives (as defined in the
+/// `is_recursively_primitive_type` function) and `None` otherwise.
+pub fn is_slice_of_primitives(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
+ let expr_type = cx.typeck_results().expr_ty_adjusted(expr);
+ let expr_kind = expr_type.kind();
+ let is_primitive = match expr_kind {
+ rustc_ty::Slice(element_type) => is_recursively_primitive_type(*element_type),
+ rustc_ty::Ref(_, inner_ty, _) if matches!(inner_ty.kind(), &rustc_ty::Slice(_)) => {
+ if let rustc_ty::Slice(element_type) = inner_ty.kind() {
+ is_recursively_primitive_type(*element_type)
+ } else {
+ unreachable!()
+ }
+ },
+ _ => false,
+ };
+
+ if is_primitive {
+ // if we have wrappers like Array, Slice or Tuple, print these
+ // and get the type enclosed in the slice ref
+ match expr_type.peel_refs().walk().nth(1).unwrap().expect_ty().kind() {
+ rustc_ty::Slice(..) => return Some("slice".into()),
+ rustc_ty::Array(..) => return Some("array".into()),
+ rustc_ty::Tuple(..) => return Some("tuple".into()),
+ _ => {
+ // is_recursively_primitive_type() should have taken care
+ // of the rest and we can rely on the type that is found
+ let refs_peeled = expr_type.peel_refs();
+ return Some(refs_peeled.walk().last().unwrap().to_string());
+ },
+ }
+ }
+ None
+}
+
+/// returns list of all pairs (a, b) from `exprs` such that `eq(a, b)`
+/// `hash` must be comformed with `eq`
+pub fn search_same<T, Hash, Eq>(exprs: &[T], hash: Hash, eq: Eq) -> Vec<(&T, &T)>
+where
+ Hash: Fn(&T) -> u64,
+ Eq: Fn(&T, &T) -> bool,
+{
+ match exprs {
+ [a, b] if eq(a, b) => return vec![(a, b)],
+ _ if exprs.len() <= 2 => return vec![],
+ _ => {},
+ }
+
+ let mut match_expr_list: Vec<(&T, &T)> = Vec::new();
+
+ let mut map: UnhashMap<u64, Vec<&_>> =
+ UnhashMap::with_capacity_and_hasher(exprs.len(), BuildHasherDefault::default());
+
+ for expr in exprs {
+ match map.entry(hash(expr)) {
+ Entry::Occupied(mut o) => {
+ for o in o.get() {
+ if eq(o, expr) {
+ match_expr_list.push((o, expr));
+ }
+ }
+ o.get_mut().push(expr);
+ },
+ Entry::Vacant(v) => {
+ v.insert(vec![expr]);
+ },
+ }
+ }
+
+ match_expr_list
+}
+
+/// Peels off all references on the pattern. Returns the underlying pattern and the number of
+/// references removed.
+pub fn peel_hir_pat_refs<'a>(pat: &'a Pat<'a>) -> (&'a Pat<'a>, usize) {
+ fn peel<'a>(pat: &'a Pat<'a>, count: usize) -> (&'a Pat<'a>, usize) {
+ if let PatKind::Ref(pat, _) = pat.kind {
+ peel(pat, count + 1)
+ } else {
+ (pat, count)
+ }
+ }
+ peel(pat, 0)
+}
+
+/// Peels of expressions while the given closure returns `Some`.
+pub fn peel_hir_expr_while<'tcx>(
+ mut expr: &'tcx Expr<'tcx>,
+ mut f: impl FnMut(&'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>>,
+) -> &'tcx Expr<'tcx> {
+ while let Some(e) = f(expr) {
+ expr = e;
+ }
+ expr
+}
+
+/// Peels off up to the given number of references on the expression. Returns the underlying
+/// expression and the number of references removed.
+pub fn peel_n_hir_expr_refs<'a>(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>, usize) {
+ let mut remaining = count;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) if remaining != 0 => {
+ remaining -= 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count - remaining)
+}
+
+/// Peels off all references on the expression. Returns the underlying expression and the number of
+/// references removed.
+pub fn peel_hir_expr_refs<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
+ let mut count = 0;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) => {
+ count += 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count)
+}
+
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_hir_ty_refs<'a>(mut ty: &'a hir::Ty<'a>) -> (&'a hir::Ty<'a>, usize) {
+ let mut count = 0;
+ loop {
+ match &ty.kind {
+ TyKind::Rptr(_, ref_ty) => {
+ ty = ref_ty.ty;
+ count += 1;
+ },
+ _ => break (ty, count),
+ }
+ }
+}
+
+/// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is
+/// dereferenced. An overloaded deref such as `Vec` to slice would not be removed.
+pub fn peel_ref_operators<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -> &'hir Expr<'hir> {
+ loop {
+ match expr.kind {
+ ExprKind::AddrOf(_, _, e) => expr = e,
+ ExprKind::Unary(UnOp::Deref, e) if cx.typeck_results().expr_ty(e).is_ref() => expr = e,
+ _ => break,
+ }
+ }
+ expr
+}
+
+pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ if let Res::Def(_, def_id) = path.res {
+ return cx.tcx.has_attr(def_id, sym::cfg) || cx.tcx.has_attr(def_id, sym::cfg_attr);
+ }
+ }
+ false
+}
+
+static TEST_ITEM_NAMES_CACHE: OnceLock<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = OnceLock::new();
+
+fn with_test_item_names(tcx: TyCtxt<'_>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
+ let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));
+ let mut map: MutexGuard<'_, FxHashMap<LocalDefId, Vec<Symbol>>> = cache.lock().unwrap();
+ let value = map.entry(module);
+ match value {
+ Entry::Occupied(entry) => f(entry.get()),
+ Entry::Vacant(entry) => {
+ let mut names = Vec::new();
+ for id in tcx.hir().module_items(module) {
+ if matches!(tcx.def_kind(id.def_id), DefKind::Const)
+ && let item = tcx.hir().item(id)
+ && let ItemKind::Const(ty, _body) = item.kind {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ // We could also check for the type name `test::TestDescAndFn`
+ if let Res::Def(DefKind::Struct, _) = path.res {
+ let has_test_marker = tcx
+ .hir()
+ .attrs(item.hir_id())
+ .iter()
+ .any(|a| a.has_name(sym::rustc_test_marker));
+ if has_test_marker {
+ names.push(item.ident.name);
+ }
+ }
+ }
+ }
+ }
+ names.sort_unstable();
+ f(entry.insert(names))
+ },
+ }
+}
+
+/// Checks if the function containing the given `HirId` is a `#[test]` function
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
+pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ with_test_item_names(tcx, tcx.parent_module(id), |names| {
+ tcx.hir()
+ .parent_iter(id)
+ // Since you can nest functions we need to collect all until we leave
+ // function scope
+ .any(|(_id, node)| {
+ if let Node::Item(item) = node {
+ if let ItemKind::Fn(_, _, _) = item.kind {
+ // Note that we have sorted the item names in the visitor,
+ // so the binary_search gets the same as `contains`, but faster.
+ return names.binary_search(&item.ident.name).is_ok();
+ }
+ }
+ false
+ })
+ })
+}
+
+/// Checks if the item containing the given `HirId` has `#[cfg(test)]` attribute applied
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[cfg(test)]` function
+pub fn is_in_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ fn is_cfg_test(attr: &Attribute) -> bool {
+ if attr.has_name(sym::cfg)
+ && let Some(items) = attr.meta_item_list()
+ && let [item] = &*items
+ && item.has_name(sym::test)
+ {
+ true
+ } else {
+ false
+ }
+ }
+ tcx.hir()
+ .parent_iter(id)
+ .flat_map(|(parent_id, _)| tcx.hir().attrs(parent_id))
+ .any(is_cfg_test)
+}
+
+/// Checks whether item either has `test` attribute applied, or
+/// is a module with `test` in its name.
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
+pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
+ is_in_test_function(tcx, item.hir_id())
+ || matches!(item.kind, ItemKind::Mod(..))
+ && item.ident.name.as_str().split('_').any(|a| a == "test" || a == "tests")
+}
+
+/// Walks the HIR tree from the given expression, up to the node where the value produced by the
+/// expression is consumed. Calls the function for every node encountered this way until it returns
+/// `Some`.
+///
+/// This allows walking through `if`, `match`, `break`, block expressions to find where the value
+/// produced by the expression is consumed.
+pub fn walk_to_expr_usage<'tcx, T>(
+ cx: &LateContext<'tcx>,
+ e: &Expr<'tcx>,
+ mut f: impl FnMut(Node<'tcx>, HirId) -> Option<T>,
+) -> Option<T> {
+ let map = cx.tcx.hir();
+ let mut iter = map.parent_iter(e.hir_id);
+ let mut child_id = e.hir_id;
+
+ while let Some((parent_id, parent)) = iter.next() {
+ if let Some(x) = f(parent, child_id) {
+ return Some(x);
+ }
+ let parent = match parent {
+ Node::Expr(e) => e,
+ Node::Block(Block { expr: Some(body), .. }) | Node::Arm(Arm { body, .. }) if body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ Node::Arm(a) if a.body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ _ => return None,
+ };
+ match parent.kind {
+ ExprKind::If(child, ..) | ExprKind::Match(child, ..) if child.hir_id != child_id => child_id = parent_id,
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _) => {
+ child_id = id;
+ iter = map.parent_iter(id);
+ },
+ ExprKind::Block(..) => child_id = parent_id,
+ _ => return None,
+ }
+ }
+ None
+}
+
+/// Checks whether a given span has any comment token
+/// This checks for all types of comment: line "//", block "/**", doc "///" "//!"
+pub fn span_contains_comment(sm: &SourceMap, span: Span) -> bool {
+ let Ok(snippet) = sm.span_to_snippet(span) else { return false };
+ return tokenize(&snippet).any(|token| {
+ matches!(
+ token.kind,
+ TokenKind::BlockComment { .. } | TokenKind::LineComment { .. }
+ )
+ });
+}
+
+/// Return all the comments a given span contains
+/// Comments are returned wrapped with their relevant delimiters
+pub fn span_extract_comment(sm: &SourceMap, span: Span) -> String {
+ let snippet = sm.span_to_snippet(span).unwrap_or_default();
+ let mut comments_buf: Vec<String> = Vec::new();
+ let mut index: usize = 0;
+
+ for token in tokenize(&snippet) {
+ let token_range = index..(index + token.len as usize);
+ index += token.len as usize;
+ match token.kind {
+ TokenKind::BlockComment { .. } | TokenKind::LineComment { .. } => {
+ if let Some(comment) = snippet.get(token_range) {
+ comments_buf.push(comment.to_string());
+ }
+ },
+ _ => (),
+ }
+ }
+
+ comments_buf.join("\n")
+}
+
+macro_rules! op_utils {
+ ($($name:ident $assign:ident)*) => {
+ /// Binary operation traits like `LangItem::Add`
+ pub static BINOP_TRAITS: &[LangItem] = &[$(LangItem::$name,)*];
+
+ /// Operator-Assign traits like `LangItem::AddAssign`
+ pub static OP_ASSIGN_TRAITS: &[LangItem] = &[$(LangItem::$assign,)*];
+
+ /// Converts `BinOpKind::Add` to `(LangItem::Add, LangItem::AddAssign)`, for example
+ pub fn binop_traits(kind: hir::BinOpKind) -> Option<(LangItem, LangItem)> {
+ match kind {
+ $(hir::BinOpKind::$name => Some((LangItem::$name, LangItem::$assign)),)*
+ _ => None,
+ }
+ }
+ };
+}
+
+op_utils! {
+ Add AddAssign
+ Sub SubAssign
+ Mul MulAssign
+ Div DivAssign
+ Rem RemAssign
+ BitXor BitXorAssign
+ BitAnd BitAndAssign
+ BitOr BitOrAssign
+ Shl ShlAssign
+ Shr ShrAssign
+}
--- /dev/null
- Implied,
+#![allow(clippy::similar_names)] // `expr` and `expn`
+
+use crate::is_path_diagnostic_item;
+use crate::source::snippet_opt;
+use crate::visitors::{for_each_expr, Descend};
+
+use arrayvec::ArrayVec;
+use itertools::{izip, Either, Itertools};
+use rustc_ast::ast::LitKind;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{self as hir, Expr, ExprField, ExprKind, HirId, Node, QPath};
+use rustc_lexer::unescape::unescape_literal;
+use rustc_lexer::{tokenize, unescape, LiteralKind, TokenKind};
+use rustc_lint::LateContext;
+use rustc_parse_format::{self as rpf, Alignment};
+use rustc_span::def_id::DefId;
+use rustc_span::hygiene::{self, MacroKind, SyntaxContext};
+use rustc_span::{sym, BytePos, ExpnData, ExpnId, ExpnKind, Pos, Span, SpanData, Symbol};
+use std::iter::{once, zip};
+use std::ops::ControlFlow;
+
+const FORMAT_MACRO_DIAG_ITEMS: &[Symbol] = &[
+ sym::assert_eq_macro,
+ sym::assert_macro,
+ sym::assert_ne_macro,
+ sym::debug_assert_eq_macro,
+ sym::debug_assert_macro,
+ sym::debug_assert_ne_macro,
+ sym::eprint_macro,
+ sym::eprintln_macro,
+ sym::format_args_macro,
+ sym::format_macro,
+ sym::print_macro,
+ sym::println_macro,
+ sym::std_panic_macro,
+ sym::write_macro,
+ sym::writeln_macro,
+];
+
+/// Returns true if a given Macro `DefId` is a format macro (e.g. `println!`)
+pub fn is_format_macro(cx: &LateContext<'_>, macro_def_id: DefId) -> bool {
+ if let Some(name) = cx.tcx.get_diagnostic_name(macro_def_id) {
+ FORMAT_MACRO_DIAG_ITEMS.contains(&name)
+ } else {
+ false
+ }
+}
+
+/// A macro call, like `vec![1, 2, 3]`.
+///
+/// Use `tcx.item_name(macro_call.def_id)` to get the macro name.
+/// Even better is to check if it is a diagnostic item.
+///
+/// This structure is similar to `ExpnData` but it precludes desugaring expansions.
+#[derive(Debug)]
+pub struct MacroCall {
+ /// Macro `DefId`
+ pub def_id: DefId,
+ /// Kind of macro
+ pub kind: MacroKind,
+ /// The expansion produced by the macro call
+ pub expn: ExpnId,
+ /// Span of the macro call site
+ pub span: Span,
+}
+
+impl MacroCall {
+ pub fn is_local(&self) -> bool {
+ span_is_local(self.span)
+ }
+}
+
+/// Returns an iterator of expansions that created the given span
+pub fn expn_backtrace(mut span: Span) -> impl Iterator<Item = (ExpnId, ExpnData)> {
+ std::iter::from_fn(move || {
+ let ctxt = span.ctxt();
+ if ctxt == SyntaxContext::root() {
+ return None;
+ }
+ let expn = ctxt.outer_expn();
+ let data = expn.expn_data();
+ span = data.call_site;
+ Some((expn, data))
+ })
+}
+
+/// Checks whether the span is from the root expansion or a locally defined macro
+pub fn span_is_local(span: Span) -> bool {
+ !span.from_expansion() || expn_is_local(span.ctxt().outer_expn())
+}
+
+/// Checks whether the expansion is the root expansion or a locally defined macro
+pub fn expn_is_local(expn: ExpnId) -> bool {
+ if expn == ExpnId::root() {
+ return true;
+ }
+ let data = expn.expn_data();
+ let backtrace = expn_backtrace(data.call_site);
+ std::iter::once((expn, data))
+ .chain(backtrace)
+ .find_map(|(_, data)| data.macro_def_id)
+ .map_or(true, DefId::is_local)
+}
+
+/// Returns an iterator of macro expansions that created the given span.
+/// Note that desugaring expansions are skipped.
+pub fn macro_backtrace(span: Span) -> impl Iterator<Item = MacroCall> {
+ expn_backtrace(span).filter_map(|(expn, data)| match data {
+ ExpnData {
+ kind: ExpnKind::Macro(kind, _),
+ macro_def_id: Some(def_id),
+ call_site: span,
+ ..
+ } => Some(MacroCall {
+ def_id,
+ kind,
+ expn,
+ span,
+ }),
+ _ => None,
+ })
+}
+
+/// If the macro backtrace of `span` has a macro call at the root expansion
+/// (i.e. not a nested macro call), returns `Some` with the `MacroCall`
+pub fn root_macro_call(span: Span) -> Option<MacroCall> {
+ macro_backtrace(span).last()
+}
+
+/// Like [`root_macro_call`], but only returns `Some` if `node` is the "first node"
+/// produced by the macro call, as in [`first_node_in_macro`].
+pub fn root_macro_call_first_node(cx: &LateContext<'_>, node: &impl HirNode) -> Option<MacroCall> {
+ if first_node_in_macro(cx, node) != Some(ExpnId::root()) {
+ return None;
+ }
+ root_macro_call(node.span())
+}
+
+/// Like [`macro_backtrace`], but only returns macro calls where `node` is the "first node" of the
+/// macro call, as in [`first_node_in_macro`].
+pub fn first_node_macro_backtrace(cx: &LateContext<'_>, node: &impl HirNode) -> impl Iterator<Item = MacroCall> {
+ let span = node.span();
+ first_node_in_macro(cx, node)
+ .into_iter()
+ .flat_map(move |expn| macro_backtrace(span).take_while(move |macro_call| macro_call.expn != expn))
+}
+
+/// If `node` is the "first node" in a macro expansion, returns `Some` with the `ExpnId` of the
+/// macro call site (i.e. the parent of the macro expansion). This generally means that `node`
+/// is the outermost node of an entire macro expansion, but there are some caveats noted below.
+/// This is useful for finding macro calls while visiting the HIR without processing the macro call
+/// at every node within its expansion.
+///
+/// If you already have immediate access to the parent node, it is simpler to
+/// just check the context of that span directly (e.g. `parent.span.from_expansion()`).
+///
+/// If a macro call is in statement position, it expands to one or more statements.
+/// In that case, each statement *and* their immediate descendants will all yield `Some`
+/// with the `ExpnId` of the containing block.
+///
+/// A node may be the "first node" of multiple macro calls in a macro backtrace.
+/// The expansion of the outermost macro call site is returned in such cases.
+pub fn first_node_in_macro(cx: &LateContext<'_>, node: &impl HirNode) -> Option<ExpnId> {
+ // get the macro expansion or return `None` if not found
+ // `macro_backtrace` importantly ignores desugaring expansions
+ let expn = macro_backtrace(node.span()).next()?.expn;
+
+ // get the parent node, possibly skipping over a statement
+ // if the parent is not found, it is sensible to return `Some(root)`
+ let hir = cx.tcx.hir();
+ let mut parent_iter = hir.parent_iter(node.hir_id());
+ let (parent_id, _) = match parent_iter.next() {
+ None => return Some(ExpnId::root()),
+ Some((_, Node::Stmt(_))) => match parent_iter.next() {
+ None => return Some(ExpnId::root()),
+ Some(next) => next,
+ },
+ Some(next) => next,
+ };
+
+ // get the macro expansion of the parent node
+ let parent_span = hir.span(parent_id);
+ let Some(parent_macro_call) = macro_backtrace(parent_span).next() else {
+ // the parent node is not in a macro
+ return Some(ExpnId::root());
+ };
+
+ if parent_macro_call.expn.is_descendant_of(expn) {
+ // `node` is input to a macro call
+ return None;
+ }
+
+ Some(parent_macro_call.expn)
+}
+
+/* Specific Macro Utils */
+
+/// Is `def_id` of `std::panic`, `core::panic` or any inner implementation macros
+pub fn is_panic(cx: &LateContext<'_>, def_id: DefId) -> bool {
+ let Some(name) = cx.tcx.get_diagnostic_name(def_id) else { return false };
+ matches!(
+ name.as_str(),
+ "core_panic_macro"
+ | "std_panic_macro"
+ | "core_panic_2015_macro"
+ | "std_panic_2015_macro"
+ | "core_panic_2021_macro"
+ )
+}
+
+pub enum PanicExpn<'a> {
+ /// No arguments - `panic!()`
+ Empty,
+ /// A string literal or any `&str` - `panic!("message")` or `panic!(message)`
+ Str(&'a Expr<'a>),
+ /// A single argument that implements `Display` - `panic!("{}", object)`
+ Display(&'a Expr<'a>),
+ /// Anything else - `panic!("error {}: {}", a, b)`
+ Format(FormatArgsExpn<'a>),
+}
+
+impl<'a> PanicExpn<'a> {
+ pub fn parse(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<Self> {
+ if !macro_backtrace(expr.span).any(|macro_call| is_panic(cx, macro_call.def_id)) {
+ return None;
+ }
+ let ExprKind::Call(callee, [arg]) = &expr.kind else { return None };
+ let ExprKind::Path(QPath::Resolved(_, path)) = &callee.kind else { return None };
+ let result = match path.segments.last().unwrap().ident.as_str() {
+ "panic" if arg.span.ctxt() == expr.span.ctxt() => Self::Empty,
+ "panic" | "panic_str" => Self::Str(arg),
+ "panic_display" => {
+ let ExprKind::AddrOf(_, _, e) = &arg.kind else { return None };
+ Self::Display(e)
+ },
+ "panic_fmt" => Self::Format(FormatArgsExpn::parse(cx, arg)?),
+ _ => return None,
+ };
+ Some(result)
+ }
+}
+
+/// Finds the arguments of an `assert!` or `debug_assert!` macro call within the macro expansion
+pub fn find_assert_args<'a>(
+ cx: &LateContext<'_>,
+ expr: &'a Expr<'a>,
+ expn: ExpnId,
+) -> Option<(&'a Expr<'a>, PanicExpn<'a>)> {
+ find_assert_args_inner(cx, expr, expn).map(|([e], p)| (e, p))
+}
+
+/// Finds the arguments of an `assert_eq!` or `debug_assert_eq!` macro call within the macro
+/// expansion
+pub fn find_assert_eq_args<'a>(
+ cx: &LateContext<'_>,
+ expr: &'a Expr<'a>,
+ expn: ExpnId,
+) -> Option<(&'a Expr<'a>, &'a Expr<'a>, PanicExpn<'a>)> {
+ find_assert_args_inner(cx, expr, expn).map(|([a, b], p)| (a, b, p))
+}
+
+fn find_assert_args_inner<'a, const N: usize>(
+ cx: &LateContext<'_>,
+ expr: &'a Expr<'a>,
+ expn: ExpnId,
+) -> Option<([&'a Expr<'a>; N], PanicExpn<'a>)> {
+ let macro_id = expn.expn_data().macro_def_id?;
+ let (expr, expn) = match cx.tcx.item_name(macro_id).as_str().strip_prefix("debug_") {
+ None => (expr, expn),
+ Some(inner_name) => find_assert_within_debug_assert(cx, expr, expn, Symbol::intern(inner_name))?,
+ };
+ let mut args = ArrayVec::new();
+ let mut panic_expn = None;
+ let _: Option<!> = for_each_expr(expr, |e| {
+ if args.is_full() {
+ if panic_expn.is_none() && e.span.ctxt() != expr.span.ctxt() {
+ panic_expn = PanicExpn::parse(cx, e);
+ }
+ ControlFlow::Continue(Descend::from(panic_expn.is_none()))
+ } else if is_assert_arg(cx, e, expn) {
+ args.push(e);
+ ControlFlow::Continue(Descend::No)
+ } else {
+ ControlFlow::Continue(Descend::Yes)
+ }
+ });
+ let args = args.into_inner().ok()?;
+ // if no `panic!(..)` is found, use `PanicExpn::Empty`
+ // to indicate that the default assertion message is used
+ let panic_expn = panic_expn.unwrap_or(PanicExpn::Empty);
+ Some((args, panic_expn))
+}
+
+fn find_assert_within_debug_assert<'a>(
+ cx: &LateContext<'_>,
+ expr: &'a Expr<'a>,
+ expn: ExpnId,
+ assert_name: Symbol,
+) -> Option<(&'a Expr<'a>, ExpnId)> {
+ for_each_expr(expr, |e| {
+ if !e.span.from_expansion() {
+ return ControlFlow::Continue(Descend::No);
+ }
+ let e_expn = e.span.ctxt().outer_expn();
+ if e_expn == expn {
+ ControlFlow::Continue(Descend::Yes)
+ } else if e_expn.expn_data().macro_def_id.map(|id| cx.tcx.item_name(id)) == Some(assert_name) {
+ ControlFlow::Break((e, e_expn))
+ } else {
+ ControlFlow::Continue(Descend::No)
+ }
+ })
+}
+
+fn is_assert_arg(cx: &LateContext<'_>, expr: &Expr<'_>, assert_expn: ExpnId) -> bool {
+ if !expr.span.from_expansion() {
+ return true;
+ }
+ let result = macro_backtrace(expr.span).try_for_each(|macro_call| {
+ if macro_call.expn == assert_expn {
+ ControlFlow::Break(false)
+ } else {
+ match cx.tcx.item_name(macro_call.def_id) {
+ // `cfg!(debug_assertions)` in `debug_assert!`
+ sym::cfg => ControlFlow::CONTINUE,
+ // assert!(other_macro!(..))
+ _ => ControlFlow::Break(true),
+ }
+ }
+ });
+ match result {
+ ControlFlow::Break(is_assert_arg) => is_assert_arg,
+ ControlFlow::Continue(()) => true,
+ }
+}
+
+/// The format string doesn't exist in the HIR, so we reassemble it from source code
+#[derive(Debug)]
+pub struct FormatString {
+ /// Span of the whole format string literal, including `[r#]"`.
+ pub span: Span,
+ /// Snippet of the whole format string literal, including `[r#]"`.
+ pub snippet: String,
+ /// If the string is raw `r"..."`/`r#""#`, how many `#`s does it have on each side.
+ pub style: Option<usize>,
+ /// The unescaped value of the format string, e.g. `"val – {}"` for the literal
+ /// `"val \u{2013} {}"`.
+ pub unescaped: String,
+ /// The format string split by format args like `{..}`.
+ pub parts: Vec<Symbol>,
+}
+
+impl FormatString {
+ fn new(cx: &LateContext<'_>, pieces: &Expr<'_>) -> Option<Self> {
+ // format_args!(r"a {} b \", 1);
+ //
+ // expands to
+ //
+ // ::core::fmt::Arguments::new_v1(&["a ", " b \\"],
+ // &[::core::fmt::ArgumentV1::new_display(&1)]);
+ //
+ // where `pieces` is the expression `&["a ", " b \\"]`. It has the span of `r"a {} b \"`
+ let span = pieces.span;
+ let snippet = snippet_opt(cx, span)?;
+
+ let (inner, style) = match tokenize(&snippet).next()?.kind {
+ TokenKind::Literal { kind, .. } => {
+ let style = match kind {
+ LiteralKind::Str { .. } => None,
+ LiteralKind::RawStr { n_hashes: Some(n), .. } => Some(n.into()),
+ _ => return None,
+ };
+
+ let start = style.map_or(1, |n| 2 + n);
+ let end = snippet.len() - style.map_or(1, |n| 1 + n);
+
+ (&snippet[start..end], style)
+ },
+ _ => return None,
+ };
+
+ let mode = if style.is_some() {
+ unescape::Mode::RawStr
+ } else {
+ unescape::Mode::Str
+ };
+
+ let mut unescaped = String::with_capacity(inner.len());
+ unescape_literal(inner, mode, &mut |_, ch| match ch {
+ Ok(ch) => unescaped.push(ch),
+ Err(e) if !e.is_fatal() => (),
+ Err(e) => panic!("{e:?}"),
+ });
+
+ let mut parts = Vec::new();
+ let _: Option<!> = for_each_expr(pieces, |expr| {
+ if let ExprKind::Lit(lit) = &expr.kind
+ && let LitKind::Str(symbol, _) = lit.node
+ {
+ parts.push(symbol);
+ }
+ ControlFlow::Continue(())
+ });
+
+ Some(Self {
+ span,
+ snippet,
+ style,
+ unescaped,
+ parts,
+ })
+ }
+}
+
+struct FormatArgsValues<'tcx> {
+ /// Values passed after the format string and implicit captures. `[1, z + 2, x]` for
+ /// `format!("{x} {} {}", 1, z + 2)`.
+ value_args: Vec<&'tcx Expr<'tcx>>,
+ /// Maps an `rt::v1::Argument::position` or an `rt::v1::Count::Param` to its index in
+ /// `value_args`
+ pos_to_value_index: Vec<usize>,
+ /// Used to check if a value is declared inline & to resolve `InnerSpan`s.
+ format_string_span: SpanData,
+}
+
+impl<'tcx> FormatArgsValues<'tcx> {
+ fn new(args: &'tcx Expr<'tcx>, format_string_span: SpanData) -> Self {
+ let mut pos_to_value_index = Vec::new();
+ let mut value_args = Vec::new();
+ let _: Option<!> = for_each_expr(args, |expr| {
+ if expr.span.ctxt() == args.span.ctxt() {
+ // ArgumentV1::new_<format_trait>(<val>)
+ // ArgumentV1::from_usize(<val>)
+ if let ExprKind::Call(callee, [val]) = expr.kind
+ && let ExprKind::Path(QPath::TypeRelative(ty, _)) = callee.kind
+ && let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind
+ && path.segments.last().unwrap().ident.name == sym::ArgumentV1
+ {
+ let val_idx = if val.span.ctxt() == expr.span.ctxt()
+ && let ExprKind::Field(_, field) = val.kind
+ && let Ok(idx) = field.name.as_str().parse()
+ {
+ // tuple index
+ idx
+ } else {
+ // assume the value expression is passed directly
+ pos_to_value_index.len()
+ };
+
+ pos_to_value_index.push(val_idx);
+ }
+ ControlFlow::Continue(Descend::Yes)
+ } else {
+ // assume that any expr with a differing span is a value
+ value_args.push(expr);
+ ControlFlow::Continue(Descend::No)
+ }
+ });
+
+ Self {
+ value_args,
+ pos_to_value_index,
+ format_string_span,
+ }
+ }
+}
+
+/// The positions of a format argument's value, precision and width
+///
+/// A position is an index into the second argument of `Arguments::new_v1[_formatted]`
+#[derive(Debug, Default, Copy, Clone)]
+struct ParamPosition {
+ /// The position stored in `rt::v1::Argument::position`.
+ value: usize,
+ /// The position stored in `rt::v1::FormatSpec::width` if it is a `Count::Param`.
+ width: Option<usize>,
+ /// The position stored in `rt::v1::FormatSpec::precision` if it is a `Count::Param`.
+ precision: Option<usize>,
+}
+
+impl<'tcx> Visitor<'tcx> for ParamPosition {
+ fn visit_expr_field(&mut self, field: &'tcx ExprField<'tcx>) {
+ fn parse_count(expr: &Expr<'_>) -> Option<usize> {
+ // ::core::fmt::rt::v1::Count::Param(1usize),
+ if let ExprKind::Call(ctor, [val]) = expr.kind
+ && let ExprKind::Path(QPath::Resolved(_, path)) = ctor.kind
+ && path.segments.last()?.ident.name == sym::Param
+ && let ExprKind::Lit(lit) = &val.kind
+ && let LitKind::Int(pos, _) = lit.node
+ {
+ Some(pos as usize)
+ } else {
+ None
+ }
+ }
+
+ match field.ident.name {
+ sym::position => {
+ if let ExprKind::Lit(lit) = &field.expr.kind
+ && let LitKind::Int(pos, _) = lit.node
+ {
+ self.value = pos as usize;
+ }
+ },
+ sym::precision => {
+ self.precision = parse_count(field.expr);
+ },
+ sym::width => {
+ self.width = parse_count(field.expr);
+ },
+ _ => walk_expr(self, field.expr),
+ }
+ }
+}
+
+/// Parses the `fmt` arg of `Arguments::new_v1_formatted(pieces, args, fmt, _)`
+fn parse_rt_fmt<'tcx>(fmt_arg: &'tcx Expr<'tcx>) -> Option<impl Iterator<Item = ParamPosition> + 'tcx> {
+ if let ExprKind::AddrOf(.., array) = fmt_arg.kind
+ && let ExprKind::Array(specs) = array.kind
+ {
+ Some(specs.iter().map(|spec| {
+ let mut position = ParamPosition::default();
+ position.visit_expr(spec);
+ position
+ }))
+ } else {
+ None
+ }
+}
+
+/// `Span::from_inner`, but for `rustc_parse_format`'s `InnerSpan`
+fn span_from_inner(base: SpanData, inner: rpf::InnerSpan) -> Span {
+ Span::new(
+ base.lo + BytePos::from_usize(inner.start),
+ base.lo + BytePos::from_usize(inner.end),
+ base.ctxt,
+ base.parent,
+ )
+}
+
+/// How a format parameter is used in the format string
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum FormatParamKind {
+ /// An implicit parameter , such as `{}` or `{:?}`.
+ Implicit,
+ /// A parameter with an explicit number, e.g. `{1}`, `{0:?}`, or `{:.0$}`
+ Numbered,
+ /// A parameter with an asterisk precision. e.g. `{:.*}`.
+ Starred,
+ /// A named parameter with a named `value_arg`, such as the `x` in `format!("{x}", x = 1)`.
+ Named(Symbol),
+ /// An implicit named parameter, such as the `y` in `format!("{y}")`.
+ NamedInline(Symbol),
+}
+
+/// Where a format parameter is being used in the format string
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub enum FormatParamUsage {
+ /// Appears as an argument, e.g. `format!("{}", foo)`
+ Argument,
+ /// Appears as a width, e.g. `format!("{:width$}", foo, width = 1)`
+ Width,
+ /// Appears as a precision, e.g. `format!("{:.precision$}", foo, precision = 1)`
+ Precision,
+}
+
+/// A `FormatParam` is any place in a `FormatArgument` that refers to a supplied value, e.g.
+///
+/// ```
+/// let precision = 2;
+/// format!("{:.precision$}", 0.1234);
+/// ```
+///
+/// has two `FormatParam`s, a [`FormatParamKind::Implicit`] `.kind` with a `.value` of `0.1234`
+/// and a [`FormatParamKind::NamedInline("precision")`] `.kind` with a `.value` of `2`
+#[derive(Debug, Copy, Clone)]
+pub struct FormatParam<'tcx> {
+ /// The expression this parameter refers to.
+ pub value: &'tcx Expr<'tcx>,
+ /// How this parameter refers to its `value`.
+ pub kind: FormatParamKind,
+ /// Where this format param is being used - argument/width/precision
+ pub usage: FormatParamUsage,
+ /// Span of the parameter, may be zero width. Includes the whitespace of implicit parameters.
+ ///
+ /// ```text
+ /// format!("{}, { }, {0}, {name}", ...);
+ /// ^ ~~ ~ ~~~~
+ /// ```
+ pub span: Span,
+}
+
+impl<'tcx> FormatParam<'tcx> {
+ fn new(
+ mut kind: FormatParamKind,
+ usage: FormatParamUsage,
+ position: usize,
+ inner: rpf::InnerSpan,
+ values: &FormatArgsValues<'tcx>,
+ ) -> Option<Self> {
+ let value_index = *values.pos_to_value_index.get(position)?;
+ let value = *values.value_args.get(value_index)?;
+ let span = span_from_inner(values.format_string_span, inner);
+
+ // if a param is declared inline, e.g. `format!("{x}")`, the generated expr's span points
+ // into the format string
+ if let FormatParamKind::Named(name) = kind && values.format_string_span.contains(value.span.data()) {
+ kind = FormatParamKind::NamedInline(name);
+ }
+
+ Some(Self {
+ value,
+ kind,
+ usage,
+ span,
+ })
+ }
+}
+
+/// Used by [width](https://doc.rust-lang.org/std/fmt/#width) and
+/// [precision](https://doc.rust-lang.org/std/fmt/#precision) specifiers.
+#[derive(Debug, Copy, Clone)]
+pub enum Count<'tcx> {
+ /// Specified with a literal number, stores the value.
+ Is(usize, Span),
+ /// Specified using `$` and `*` syntaxes. The `*` format is still considered to be
+ /// `FormatParamKind::Numbered`.
+ Param(FormatParam<'tcx>),
+ /// Not specified.
- rpf::Count::CountIs(val) => Self::Is(val, span_from_inner(values.format_string_span, inner?)),
++ Implied(Option<Span>),
+}
+
+impl<'tcx> Count<'tcx> {
+ fn new(
+ usage: FormatParamUsage,
+ count: rpf::Count<'_>,
+ position: Option<usize>,
+ inner: Option<rpf::InnerSpan>,
+ values: &FormatArgsValues<'tcx>,
+ ) -> Option<Self> {
++ let span = inner.map(|inner| span_from_inner(values.format_string_span, inner));
++
+ Some(match count {
- rpf::Count::CountImplied => Self::Implied,
++ rpf::Count::CountIs(val) => Self::Is(val, span?),
+ rpf::Count::CountIsName(name, _) => Self::Param(FormatParam::new(
+ FormatParamKind::Named(Symbol::intern(name)),
+ usage,
+ position?,
+ inner?,
+ values,
+ )?),
+ rpf::Count::CountIsParam(_) => Self::Param(FormatParam::new(
+ FormatParamKind::Numbered,
+ usage,
+ position?,
+ inner?,
+ values,
+ )?),
+ rpf::Count::CountIsStar(_) => Self::Param(FormatParam::new(
+ FormatParamKind::Starred,
+ usage,
+ position?,
+ inner?,
+ values,
+ )?),
- matches!(self, Count::Implied)
++ rpf::Count::CountImplied => Self::Implied(span),
+ })
+ }
+
+ pub fn is_implied(self) -> bool {
- self.r#trait == sym::Display
- && self.width.is_implied()
++ matches!(self, Count::Implied(_))
+ }
+
+ pub fn param(self) -> Option<FormatParam<'tcx>> {
+ match self {
+ Count::Param(param) => Some(param),
+ _ => None,
+ }
+ }
++
++ pub fn span(self) -> Option<Span> {
++ match self {
++ Count::Is(_, span) => Some(span),
++ Count::Param(param) => Some(param.span),
++ Count::Implied(span) => span,
++ }
++ }
+}
+
+/// Specification for the formatting of an argument in the format string. See
+/// <https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters> for the precise meanings.
+#[derive(Debug)]
+pub struct FormatSpec<'tcx> {
+ /// Optionally specified character to fill alignment with.
+ pub fill: Option<char>,
+ /// Optionally specified alignment.
+ pub align: Alignment,
+ /// Packed version of various flags provided, see [`rustc_parse_format::Flag`].
+ pub flags: u32,
+ /// Represents either the maximum width or the integer precision.
+ pub precision: Count<'tcx>,
+ /// The minimum width, will be padded according to `width`/`align`
+ pub width: Count<'tcx>,
+ /// The formatting trait used by the argument, e.g. `sym::Display` for `{}`, `sym::Debug` for
+ /// `{:?}`.
+ pub r#trait: Symbol,
+ pub trait_span: Option<Span>,
+}
+
+impl<'tcx> FormatSpec<'tcx> {
+ fn new(spec: rpf::FormatSpec<'_>, positions: ParamPosition, values: &FormatArgsValues<'tcx>) -> Option<Self> {
+ Some(Self {
+ fill: spec.fill,
+ align: spec.align,
+ flags: spec.flags,
+ precision: Count::new(
+ FormatParamUsage::Precision,
+ spec.precision,
+ positions.precision,
+ spec.precision_span,
+ values,
+ )?,
+ width: Count::new(
+ FormatParamUsage::Width,
+ spec.width,
+ positions.width,
+ spec.width_span,
+ values,
+ )?,
+ r#trait: match spec.ty {
+ "" => sym::Display,
+ "?" => sym::Debug,
+ "o" => sym!(Octal),
+ "x" => sym!(LowerHex),
+ "X" => sym!(UpperHex),
+ "p" => sym::Pointer,
+ "b" => sym!(Binary),
+ "e" => sym!(LowerExp),
+ "E" => sym!(UpperExp),
+ _ => return None,
+ },
+ trait_span: spec
+ .ty_span
+ .map(|span| span_from_inner(values.format_string_span, span)),
+ })
+ }
+
+ /// Returns true if this format spec is unchanged from the default. e.g. returns true for `{}`,
+ /// `{foo}` and `{2}`, but false for `{:?}`, `{foo:5}` and `{3:.5}`
+ pub fn is_default(&self) -> bool {
++ self.r#trait == sym::Display && self.is_default_for_trait()
++ }
++
++ /// Has no other formatting specifiers than setting the format trait. returns true for `{}`,
++ /// `{foo}`, `{:?}`, but false for `{foo:5}`, `{3:.5?}`
++ pub fn is_default_for_trait(&self) -> bool {
++ self.width.is_implied()
+ && self.precision.is_implied()
+ && self.align == Alignment::AlignUnknown
+ && self.flags == 0
+ }
+}
+
+/// A format argument, such as `{}`, `{foo:?}`.
+#[derive(Debug)]
+pub struct FormatArg<'tcx> {
+ /// The parameter the argument refers to.
+ pub param: FormatParam<'tcx>,
+ /// How to format `param`.
+ pub format: FormatSpec<'tcx>,
+ /// span of the whole argument, `{..}`.
+ pub span: Span,
+}
+
++impl<'tcx> FormatArg<'tcx> {
++ /// Span of the `:` and format specifiers
++ ///
++ /// ```ignore
++ /// format!("{:.}"), format!("{foo:.}")
++ /// ^^ ^^
++ /// ```
++ pub fn format_span(&self) -> Span {
++ let base = self.span.data();
++
++ // `base.hi` is `{...}|`, subtract 1 byte (the length of '}') so that it points before the closing
++ // brace `{...|}`
++ Span::new(self.param.span.hi(), base.hi - BytePos(1), base.ctxt, base.parent)
++ }
++}
++
+/// A parsed `format_args!` expansion.
+#[derive(Debug)]
+pub struct FormatArgsExpn<'tcx> {
+ /// The format string literal.
+ pub format_string: FormatString,
+ /// The format arguments, such as `{:?}`.
+ pub args: Vec<FormatArg<'tcx>>,
+ /// Has an added newline due to `println!()`/`writeln!()`/etc. The last format string part will
+ /// include this added newline.
+ pub newline: bool,
+ /// Spans of the commas between the format string and explicit values, excluding any trailing
+ /// comma
+ ///
+ /// ```ignore
+ /// format!("..", 1, 2, 3,)
+ /// // ^ ^ ^
+ /// ```
+ comma_spans: Vec<Span>,
+ /// Explicit values passed after the format string, ignoring implicit captures. `[1, z + 2]` for
+ /// `format!("{x} {} {y}", 1, z + 2)`.
+ explicit_values: Vec<&'tcx Expr<'tcx>>,
+}
+
+impl<'tcx> FormatArgsExpn<'tcx> {
+ /// Gets the spans of the commas inbetween the format string and explicit args, not including
+ /// any trailing comma
+ ///
+ /// ```ignore
+ /// format!("{} {}", a, b)
+ /// // ^ ^
+ /// ```
+ ///
+ /// Ensures that the format string and values aren't coming from a proc macro that sets the
+ /// output span to that of its input
+ fn comma_spans(cx: &LateContext<'_>, explicit_values: &[&Expr<'_>], fmt_span: Span) -> Option<Vec<Span>> {
+ // `format!("{} {} {c}", "one", "two", c = "three")`
+ // ^^^^^ ^^^^^ ^^^^^^^
+ let value_spans = explicit_values
+ .iter()
+ .map(|val| hygiene::walk_chain(val.span, fmt_span.ctxt()));
+
+ // `format!("{} {} {c}", "one", "two", c = "three")`
+ // ^^ ^^ ^^^^^^
+ let between_spans = once(fmt_span)
+ .chain(value_spans)
+ .tuple_windows()
+ .map(|(start, end)| start.between(end));
+
+ let mut comma_spans = Vec::new();
+ for between_span in between_spans {
+ let mut offset = 0;
+ let mut seen_comma = false;
+
+ for token in tokenize(&snippet_opt(cx, between_span)?) {
+ match token.kind {
+ TokenKind::LineComment { .. } | TokenKind::BlockComment { .. } | TokenKind::Whitespace => {},
+ TokenKind::Comma if !seen_comma => {
+ seen_comma = true;
+
+ let base = between_span.data();
+ comma_spans.push(Span::new(
+ base.lo + BytePos(offset),
+ base.lo + BytePos(offset + 1),
+ base.ctxt,
+ base.parent,
+ ));
+ },
+ // named arguments, `start_val, name = end_val`
+ // ^^^^^^^^^ between_span
+ TokenKind::Ident | TokenKind::Eq if seen_comma => {},
+ // An unexpected token usually indicates the format string or a value came from a proc macro output
+ // that sets the span of its output to an input, e.g. `println!(some_proc_macro!("input"), ..)` that
+ // emits a string literal with the span set to that of `"input"`
+ _ => return None,
+ }
+ offset += token.len;
+ }
+
+ if !seen_comma {
+ return None;
+ }
+ }
+
+ Some(comma_spans)
+ }
+
+ pub fn parse(cx: &LateContext<'_>, expr: &'tcx Expr<'tcx>) -> Option<Self> {
+ let macro_name = macro_backtrace(expr.span)
+ .map(|macro_call| cx.tcx.item_name(macro_call.def_id))
+ .find(|&name| matches!(name, sym::const_format_args | sym::format_args | sym::format_args_nl))?;
+ let newline = macro_name == sym::format_args_nl;
+
+ // ::core::fmt::Arguments::new_v1(pieces, args)
+ // ::core::fmt::Arguments::new_v1_formatted(pieces, args, fmt, _unsafe_arg)
+ if let ExprKind::Call(callee, [pieces, args, rest @ ..]) = expr.kind
+ && let ExprKind::Path(QPath::TypeRelative(ty, seg)) = callee.kind
+ && is_path_diagnostic_item(cx, ty, sym::Arguments)
+ && matches!(seg.ident.as_str(), "new_v1" | "new_v1_formatted")
+ {
+ let format_string = FormatString::new(cx, pieces)?;
+
+ let mut parser = rpf::Parser::new(
+ &format_string.unescaped,
+ format_string.style,
+ Some(format_string.snippet.clone()),
+ // `format_string.unescaped` does not contain the appended newline
+ false,
+ rpf::ParseMode::Format,
+ );
+
+ let parsed_args = parser
+ .by_ref()
+ .filter_map(|piece| match piece {
+ rpf::Piece::NextArgument(a) => Some(a),
+ rpf::Piece::String(_) => None,
+ })
+ .collect_vec();
+ if !parser.errors.is_empty() {
+ return None;
+ }
+
+ let positions = if let Some(fmt_arg) = rest.first() {
+ // If the argument contains format specs, `new_v1_formatted(_, _, fmt, _)`, parse
+ // them.
+
+ Either::Left(parse_rt_fmt(fmt_arg)?)
+ } else {
+ // If no format specs are given, the positions are in the given order and there are
+ // no `precision`/`width`s to consider.
+
+ Either::Right((0..).map(|n| ParamPosition {
+ value: n,
+ width: None,
+ precision: None,
+ }))
+ };
+
+ let values = FormatArgsValues::new(args, format_string.span.data());
+
+ let args = izip!(positions, parsed_args, parser.arg_places)
+ .map(|(position, parsed_arg, arg_span)| {
+ Some(FormatArg {
+ param: FormatParam::new(
+ match parsed_arg.position {
+ rpf::Position::ArgumentImplicitlyIs(_) => FormatParamKind::Implicit,
+ rpf::Position::ArgumentIs(_) => FormatParamKind::Numbered,
+ // NamedInline is handled by `FormatParam::new()`
+ rpf::Position::ArgumentNamed(name) => FormatParamKind::Named(Symbol::intern(name)),
+ },
+ FormatParamUsage::Argument,
+ position.value,
+ parsed_arg.position_span,
+ &values,
+ )?,
+ format: FormatSpec::new(parsed_arg.format, position, &values)?,
+ span: span_from_inner(values.format_string_span, arg_span),
+ })
+ })
+ .collect::<Option<Vec<_>>>()?;
+
+ let mut explicit_values = values.value_args;
+ // remove values generated for implicitly captured vars
+ let len = explicit_values
+ .iter()
+ .take_while(|val| !format_string.span.contains(val.span))
+ .count();
+ explicit_values.truncate(len);
+
+ let comma_spans = Self::comma_spans(cx, &explicit_values, format_string.span)?;
+
+ Some(Self {
+ format_string,
+ args,
+ newline,
+ comma_spans,
+ explicit_values,
+ })
+ } else {
+ None
+ }
+ }
+
+ pub fn find_nested(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>, expn_id: ExpnId) -> Option<Self> {
+ for_each_expr(expr, |e| {
+ let e_ctxt = e.span.ctxt();
+ if e_ctxt == expr.span.ctxt() {
+ ControlFlow::Continue(Descend::Yes)
+ } else if e_ctxt.outer_expn().is_descendant_of(expn_id) {
+ if let Some(args) = FormatArgsExpn::parse(cx, e) {
+ ControlFlow::Break(args)
+ } else {
+ ControlFlow::Continue(Descend::No)
+ }
+ } else {
+ ControlFlow::Continue(Descend::No)
+ }
+ })
+ }
+
+ /// Source callsite span of all inputs
+ pub fn inputs_span(&self) -> Span {
+ match *self.explicit_values {
+ [] => self.format_string.span,
+ [.., last] => self
+ .format_string
+ .span
+ .to(hygiene::walk_chain(last.span, self.format_string.span.ctxt())),
+ }
+ }
+
+ /// Get the span of a value expanded to the previous comma, e.g. for the value `10`
+ ///
+ /// ```ignore
+ /// format("{}.{}", 10, 11)
+ /// // ^^^^
+ /// ```
+ pub fn value_with_prev_comma_span(&self, value_id: HirId) -> Option<Span> {
+ for (comma_span, value) in zip(&self.comma_spans, &self.explicit_values) {
+ if value.hir_id == value_id {
+ return Some(comma_span.to(hygiene::walk_chain(value.span, comma_span.ctxt())));
+ }
+ }
+
+ None
+ }
+
+ /// Iterator of all format params, both values and those referenced by `width`/`precision`s.
+ pub fn params(&'tcx self) -> impl Iterator<Item = FormatParam<'tcx>> {
+ self.args
+ .iter()
+ .flat_map(|arg| [Some(arg.param), arg.format.precision.param(), arg.format.width.param()])
+ .flatten()
+ }
+}
+
+/// A node with a `HirId` and a `Span`
+pub trait HirNode {
+ fn hir_id(&self) -> HirId;
+ fn span(&self) -> Span;
+}
+
+macro_rules! impl_hir_node {
+ ($($t:ident),*) => {
+ $(impl HirNode for hir::$t<'_> {
+ fn hir_id(&self) -> HirId {
+ self.hir_id
+ }
+ fn span(&self) -> Span {
+ self.span
+ }
+ })*
+ };
+}
+
+impl_hir_node!(Expr, Pat);
+
+impl HirNode for hir::Item<'_> {
+ fn hir_id(&self) -> HirId {
+ self.hir_id()
+ }
+
+ fn span(&self) -> Span {
+ self.span
+ }
+}
--- /dev/null
--- /dev/null
++use rustc_index::bit_set::BitSet;
++use rustc_middle::mir;
++use rustc_mir_dataflow::{AnalysisDomain, CallReturnPlaces, GenKill, GenKillAnalysis};
++
++/// Determines liveness of each local purely based on `StorageLive`/`Dead`.
++#[derive(Copy, Clone)]
++pub(super) struct MaybeStorageLive;
++
++impl<'tcx> AnalysisDomain<'tcx> for MaybeStorageLive {
++ type Domain = BitSet<mir::Local>;
++ const NAME: &'static str = "maybe_storage_live";
++
++ fn bottom_value(&self, body: &mir::Body<'tcx>) -> Self::Domain {
++ // bottom = dead
++ BitSet::new_empty(body.local_decls.len())
++ }
++
++ fn initialize_start_block(&self, body: &mir::Body<'tcx>, state: &mut Self::Domain) {
++ for arg in body.args_iter() {
++ state.insert(arg);
++ }
++ }
++}
++
++impl<'tcx> GenKillAnalysis<'tcx> for MaybeStorageLive {
++ type Idx = mir::Local;
++
++ fn statement_effect(&self, trans: &mut impl GenKill<Self::Idx>, stmt: &mir::Statement<'tcx>, _: mir::Location) {
++ match stmt.kind {
++ mir::StatementKind::StorageLive(l) => trans.gen(l),
++ mir::StatementKind::StorageDead(l) => trans.kill(l),
++ _ => (),
++ }
++ }
++
++ fn terminator_effect(
++ &self,
++ _trans: &mut impl GenKill<Self::Idx>,
++ _terminator: &mir::Terminator<'tcx>,
++ _loc: mir::Location,
++ ) {
++ }
++
++ fn call_return_effect(
++ &self,
++ _trans: &mut impl GenKill<Self::Idx>,
++ _block: mir::BasicBlock,
++ _return_places: CallReturnPlaces<'_, 'tcx>,
++ ) {
++ // Nothing to do when a call returns successfully
++ }
++}
--- /dev/null
--- /dev/null
++use rustc_hir::{Expr, HirId};
++use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor};
++use rustc_middle::mir::{
++ traversal, Body, InlineAsmOperand, Local, Location, Place, StatementKind, TerminatorKind, START_BLOCK,
++};
++use rustc_middle::ty::TyCtxt;
++
++mod maybe_storage_live;
++
++mod possible_borrower;
++pub use possible_borrower::PossibleBorrowerMap;
++
++mod possible_origin;
++
++mod transitive_relation;
++
++#[derive(Clone, Debug, Default)]
++pub struct LocalUsage {
++ /// The locations where the local is used, if any.
++ pub local_use_locs: Vec<Location>,
++ /// The locations where the local is consumed or mutated, if any.
++ pub local_consume_or_mutate_locs: Vec<Location>,
++}
++
++pub fn visit_local_usage(locals: &[Local], mir: &Body<'_>, location: Location) -> Option<Vec<LocalUsage>> {
++ let init = vec![
++ LocalUsage {
++ local_use_locs: Vec::new(),
++ local_consume_or_mutate_locs: Vec::new(),
++ };
++ locals.len()
++ ];
++
++ traversal::ReversePostorder::new(mir, location.block).try_fold(init, |usage, (tbb, tdata)| {
++ // Give up on loops
++ if tdata.terminator().successors().any(|s| s == location.block) {
++ return None;
++ }
++
++ let mut v = V {
++ locals,
++ location,
++ results: usage,
++ };
++ v.visit_basic_block_data(tbb, tdata);
++ Some(v.results)
++ })
++}
++
++struct V<'a> {
++ locals: &'a [Local],
++ location: Location,
++ results: Vec<LocalUsage>,
++}
++
++impl<'a, 'tcx> Visitor<'tcx> for V<'a> {
++ fn visit_place(&mut self, place: &Place<'tcx>, ctx: PlaceContext, loc: Location) {
++ if loc.block == self.location.block && loc.statement_index <= self.location.statement_index {
++ return;
++ }
++
++ let local = place.local;
++
++ for (i, self_local) in self.locals.iter().enumerate() {
++ if local == *self_local {
++ if !matches!(
++ ctx,
++ PlaceContext::MutatingUse(MutatingUseContext::Drop) | PlaceContext::NonUse(_)
++ ) {
++ self.results[i].local_use_locs.push(loc);
++ }
++ if matches!(
++ ctx,
++ PlaceContext::NonMutatingUse(NonMutatingUseContext::Move)
++ | PlaceContext::MutatingUse(MutatingUseContext::Borrow)
++ ) {
++ self.results[i].local_consume_or_mutate_locs.push(loc);
++ }
++ }
++ }
++ }
++}
++
++/// Convenience wrapper around `visit_local_usage`.
++pub fn used_exactly_once(mir: &rustc_middle::mir::Body<'_>, local: rustc_middle::mir::Local) -> Option<bool> {
++ visit_local_usage(
++ &[local],
++ mir,
++ Location {
++ block: START_BLOCK,
++ statement_index: 0,
++ },
++ )
++ .map(|mut vec| {
++ let LocalUsage { local_use_locs, .. } = vec.remove(0);
++ local_use_locs
++ .into_iter()
++ .filter(|location| !is_local_assignment(mir, local, *location))
++ .count()
++ == 1
++ })
++}
++
++/// Returns the `mir::Body` containing the node associated with `hir_id`.
++#[allow(clippy::module_name_repetitions)]
++pub fn enclosing_mir(tcx: TyCtxt<'_>, hir_id: HirId) -> &Body<'_> {
++ let body_owner_local_def_id = tcx.hir().enclosing_body_owner(hir_id);
++ tcx.optimized_mir(body_owner_local_def_id.to_def_id())
++}
++
++/// Tries to determine the `Local` corresponding to `expr`, if any.
++/// This function is expensive and should be used sparingly.
++pub fn expr_local(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> Option<Local> {
++ let mir = enclosing_mir(tcx, expr.hir_id);
++ mir.local_decls.iter_enumerated().find_map(|(local, local_decl)| {
++ if local_decl.source_info.span == expr.span {
++ Some(local)
++ } else {
++ None
++ }
++ })
++}
++
++/// Returns a vector of `mir::Location` where `local` is assigned.
++pub fn local_assignments(mir: &Body<'_>, local: Local) -> Vec<Location> {
++ let mut locations = Vec::new();
++ for (block, data) in mir.basic_blocks.iter_enumerated() {
++ for statement_index in 0..=data.statements.len() {
++ let location = Location { block, statement_index };
++ if is_local_assignment(mir, local, location) {
++ locations.push(location);
++ }
++ }
++ }
++ locations
++}
++
++// `is_local_assignment` is based on `is_place_assignment`:
++// https://github.com/rust-lang/rust/blob/b7413511dc85ec01ef4b91785f86614589ac6103/compiler/rustc_middle/src/mir/visit.rs#L1350
++fn is_local_assignment(mir: &Body<'_>, local: Local, location: Location) -> bool {
++ let Location { block, statement_index } = location;
++ let basic_block = &mir.basic_blocks[block];
++ if statement_index < basic_block.statements.len() {
++ let statement = &basic_block.statements[statement_index];
++ if let StatementKind::Assign(box (place, _)) = statement.kind {
++ place.as_local() == Some(local)
++ } else {
++ false
++ }
++ } else {
++ let terminator = basic_block.terminator();
++ match &terminator.kind {
++ TerminatorKind::Call { destination, .. } => destination.as_local() == Some(local),
++ TerminatorKind::InlineAsm { operands, .. } => operands.iter().any(|operand| {
++ if let InlineAsmOperand::Out { place: Some(place), .. } = operand {
++ place.as_local() == Some(local)
++ } else {
++ false
++ }
++ }),
++ _ => false,
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use super::{
++ maybe_storage_live::MaybeStorageLive, possible_origin::PossibleOriginVisitor,
++ transitive_relation::TransitiveRelation,
++};
++use crate::ty::is_copy;
++use rustc_data_structures::fx::FxHashMap;
++use rustc_index::bit_set::{BitSet, HybridBitSet};
++use rustc_lint::LateContext;
++use rustc_middle::mir::{self, visit::Visitor as _, Mutability};
++use rustc_middle::ty::{self, visit::TypeVisitor};
++use rustc_mir_dataflow::{Analysis, ResultsCursor};
++use std::ops::ControlFlow;
++
++/// Collects the possible borrowers of each local.
++/// For example, `b = &a; c = &a;` will make `b` and (transitively) `c`
++/// possible borrowers of `a`.
++#[allow(clippy::module_name_repetitions)]
++struct PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ possible_borrower: TransitiveRelation,
++ body: &'b mir::Body<'tcx>,
++ cx: &'a LateContext<'tcx>,
++ possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
++}
++
++impl<'a, 'b, 'tcx> PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ fn new(
++ cx: &'a LateContext<'tcx>,
++ body: &'b mir::Body<'tcx>,
++ possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
++ ) -> Self {
++ Self {
++ possible_borrower: TransitiveRelation::default(),
++ cx,
++ body,
++ possible_origin,
++ }
++ }
++
++ fn into_map(
++ self,
++ cx: &'a LateContext<'tcx>,
++ maybe_live: ResultsCursor<'b, 'tcx, MaybeStorageLive>,
++ ) -> PossibleBorrowerMap<'b, 'tcx> {
++ let mut map = FxHashMap::default();
++ for row in (1..self.body.local_decls.len()).map(mir::Local::from_usize) {
++ if is_copy(cx, self.body.local_decls[row].ty) {
++ continue;
++ }
++
++ let mut borrowers = self.possible_borrower.reachable_from(row, self.body.local_decls.len());
++ borrowers.remove(mir::Local::from_usize(0));
++ if !borrowers.is_empty() {
++ map.insert(row, borrowers);
++ }
++ }
++
++ let bs = BitSet::new_empty(self.body.local_decls.len());
++ PossibleBorrowerMap {
++ map,
++ maybe_live,
++ bitset: (bs.clone(), bs),
++ }
++ }
++}
++
++impl<'a, 'b, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ fn visit_assign(&mut self, place: &mir::Place<'tcx>, rvalue: &mir::Rvalue<'_>, _location: mir::Location) {
++ let lhs = place.local;
++ match rvalue {
++ mir::Rvalue::Ref(_, _, borrowed) => {
++ self.possible_borrower.add(borrowed.local, lhs);
++ },
++ other => {
++ if ContainsRegion
++ .visit_ty(place.ty(&self.body.local_decls, self.cx.tcx).ty)
++ .is_continue()
++ {
++ return;
++ }
++ rvalue_locals(other, |rhs| {
++ if lhs != rhs {
++ self.possible_borrower.add(rhs, lhs);
++ }
++ });
++ },
++ }
++ }
++
++ fn visit_terminator(&mut self, terminator: &mir::Terminator<'_>, _loc: mir::Location) {
++ if let mir::TerminatorKind::Call {
++ args,
++ destination: mir::Place { local: dest, .. },
++ ..
++ } = &terminator.kind
++ {
++ // TODO add doc
++ // If the call returns something with lifetimes,
++ // let's conservatively assume the returned value contains lifetime of all the arguments.
++ // For example, given `let y: Foo<'a> = foo(x)`, `y` is considered to be a possible borrower of `x`.
++
++ let mut immutable_borrowers = vec![];
++ let mut mutable_borrowers = vec![];
++
++ for op in args {
++ match op {
++ mir::Operand::Copy(p) | mir::Operand::Move(p) => {
++ if let ty::Ref(_, _, Mutability::Mut) = self.body.local_decls[p.local].ty.kind() {
++ mutable_borrowers.push(p.local);
++ } else {
++ immutable_borrowers.push(p.local);
++ }
++ },
++ mir::Operand::Constant(..) => (),
++ }
++ }
++
++ let mut mutable_variables: Vec<mir::Local> = mutable_borrowers
++ .iter()
++ .filter_map(|r| self.possible_origin.get(r))
++ .flat_map(HybridBitSet::iter)
++ .collect();
++
++ if ContainsRegion.visit_ty(self.body.local_decls[*dest].ty).is_break() {
++ mutable_variables.push(*dest);
++ }
++
++ for y in mutable_variables {
++ for x in &immutable_borrowers {
++ self.possible_borrower.add(*x, y);
++ }
++ for x in &mutable_borrowers {
++ self.possible_borrower.add(*x, y);
++ }
++ }
++ }
++ }
++}
++
++struct ContainsRegion;
++
++impl TypeVisitor<'_> for ContainsRegion {
++ type BreakTy = ();
++
++ fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<Self::BreakTy> {
++ ControlFlow::BREAK
++ }
++}
++
++fn rvalue_locals(rvalue: &mir::Rvalue<'_>, mut visit: impl FnMut(mir::Local)) {
++ use rustc_middle::mir::Rvalue::{Aggregate, BinaryOp, Cast, CheckedBinaryOp, Repeat, UnaryOp, Use};
++
++ let mut visit_op = |op: &mir::Operand<'_>| match op {
++ mir::Operand::Copy(p) | mir::Operand::Move(p) => visit(p.local),
++ mir::Operand::Constant(..) => (),
++ };
++
++ match rvalue {
++ Use(op) | Repeat(op, _) | Cast(_, op, _) | UnaryOp(_, op) => visit_op(op),
++ Aggregate(_, ops) => ops.iter().for_each(visit_op),
++ BinaryOp(_, box (lhs, rhs)) | CheckedBinaryOp(_, box (lhs, rhs)) => {
++ visit_op(lhs);
++ visit_op(rhs);
++ },
++ _ => (),
++ }
++}
++
++/// Result of `PossibleBorrowerVisitor`.
++#[allow(clippy::module_name_repetitions)]
++pub struct PossibleBorrowerMap<'b, 'tcx> {
++ /// Mapping `Local -> its possible borrowers`
++ pub map: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
++ maybe_live: ResultsCursor<'b, 'tcx, MaybeStorageLive>,
++ // Caches to avoid allocation of `BitSet` on every query
++ pub bitset: (BitSet<mir::Local>, BitSet<mir::Local>),
++}
++
++impl<'a, 'b, 'tcx> PossibleBorrowerMap<'b, 'tcx> {
++ pub fn new(cx: &'a LateContext<'tcx>, mir: &'b mir::Body<'tcx>) -> Self {
++ let possible_origin = {
++ let mut vis = PossibleOriginVisitor::new(mir);
++ vis.visit_body(mir);
++ vis.into_map(cx)
++ };
++ let maybe_storage_live_result = MaybeStorageLive
++ .into_engine(cx.tcx, mir)
++ .pass_name("redundant_clone")
++ .iterate_to_fixpoint()
++ .into_results_cursor(mir);
++ let mut vis = PossibleBorrowerVisitor::new(cx, mir, possible_origin);
++ vis.visit_body(mir);
++ vis.into_map(cx, maybe_storage_live_result)
++ }
++
++ /// Returns true if the set of borrowers of `borrowed` living at `at` matches with `borrowers`.
++ pub fn only_borrowers(&mut self, borrowers: &[mir::Local], borrowed: mir::Local, at: mir::Location) -> bool {
++ self.bounded_borrowers(borrowers, borrowers, borrowed, at)
++ }
++
++ /// Returns true if the set of borrowers of `borrowed` living at `at` includes at least `below`
++ /// but no more than `above`.
++ pub fn bounded_borrowers(
++ &mut self,
++ below: &[mir::Local],
++ above: &[mir::Local],
++ borrowed: mir::Local,
++ at: mir::Location,
++ ) -> bool {
++ self.maybe_live.seek_after_primary_effect(at);
++
++ self.bitset.0.clear();
++ let maybe_live = &mut self.maybe_live;
++ if let Some(bitset) = self.map.get(&borrowed) {
++ for b in bitset.iter().filter(move |b| maybe_live.contains(*b)) {
++ self.bitset.0.insert(b);
++ }
++ } else {
++ return false;
++ }
++
++ self.bitset.1.clear();
++ for b in below {
++ self.bitset.1.insert(*b);
++ }
++
++ if !self.bitset.0.superset(&self.bitset.1) {
++ return false;
++ }
++
++ for b in above {
++ self.bitset.0.remove(*b);
++ }
++
++ self.bitset.0.is_empty()
++ }
++
++ pub fn local_is_alive_at(&mut self, local: mir::Local, at: mir::Location) -> bool {
++ self.maybe_live.seek_after_primary_effect(at);
++ self.maybe_live.contains(local)
++ }
++}
--- /dev/null
--- /dev/null
++use super::transitive_relation::TransitiveRelation;
++use crate::ty::is_copy;
++use rustc_data_structures::fx::FxHashMap;
++use rustc_index::bit_set::HybridBitSet;
++use rustc_lint::LateContext;
++use rustc_middle::mir;
++
++/// Collect possible borrowed for every `&mut` local.
++/// For example, `_1 = &mut _2` generate _1: {_2,...}
++/// Known Problems: not sure all borrowed are tracked
++#[allow(clippy::module_name_repetitions)]
++pub(super) struct PossibleOriginVisitor<'a, 'tcx> {
++ possible_origin: TransitiveRelation,
++ body: &'a mir::Body<'tcx>,
++}
++
++impl<'a, 'tcx> PossibleOriginVisitor<'a, 'tcx> {
++ pub fn new(body: &'a mir::Body<'tcx>) -> Self {
++ Self {
++ possible_origin: TransitiveRelation::default(),
++ body,
++ }
++ }
++
++ pub fn into_map(self, cx: &LateContext<'tcx>) -> FxHashMap<mir::Local, HybridBitSet<mir::Local>> {
++ let mut map = FxHashMap::default();
++ for row in (1..self.body.local_decls.len()).map(mir::Local::from_usize) {
++ if is_copy(cx, self.body.local_decls[row].ty) {
++ continue;
++ }
++
++ let mut borrowers = self.possible_origin.reachable_from(row, self.body.local_decls.len());
++ borrowers.remove(mir::Local::from_usize(0));
++ if !borrowers.is_empty() {
++ map.insert(row, borrowers);
++ }
++ }
++ map
++ }
++}
++
++impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleOriginVisitor<'a, 'tcx> {
++ fn visit_assign(&mut self, place: &mir::Place<'tcx>, rvalue: &mir::Rvalue<'_>, _location: mir::Location) {
++ let lhs = place.local;
++ match rvalue {
++ // Only consider `&mut`, which can modify origin place
++ mir::Rvalue::Ref(_, rustc_middle::mir::BorrowKind::Mut { .. }, borrowed) |
++ // _2: &mut _;
++ // _3 = move _2
++ mir::Rvalue::Use(mir::Operand::Move(borrowed)) |
++ // _3 = move _2 as &mut _;
++ mir::Rvalue::Cast(_, mir::Operand::Move(borrowed), _)
++ => {
++ self.possible_origin.add(lhs, borrowed.local);
++ },
++ _ => {},
++ }
++ }
++}
--- /dev/null
--- /dev/null
++use rustc_data_structures::fx::FxHashMap;
++use rustc_index::bit_set::HybridBitSet;
++use rustc_middle::mir;
++
++#[derive(Default)]
++pub(super) struct TransitiveRelation {
++ relations: FxHashMap<mir::Local, Vec<mir::Local>>,
++}
++
++impl TransitiveRelation {
++ pub fn add(&mut self, a: mir::Local, b: mir::Local) {
++ self.relations.entry(a).or_default().push(b);
++ }
++
++ pub fn reachable_from(&self, a: mir::Local, domain_size: usize) -> HybridBitSet<mir::Local> {
++ let mut seen = HybridBitSet::new_empty(domain_size);
++ let mut stack = vec![a];
++ while let Some(u) = stack.pop() {
++ if let Some(edges) = self.relations.get(&u) {
++ for &v in edges {
++ if seen.insert(v) {
++ stack.push(v);
++ }
++ }
++ }
++ }
++ seen
++ }
++}
--- /dev/null
- let radix = if lit.starts_with("0x") {
+use rustc_ast::ast::{Lit, LitFloatType, LitIntType, LitKind};
+use std::iter;
+
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+pub enum Radix {
+ Binary,
+ Octal,
+ Decimal,
+ Hexadecimal,
+}
+
+impl Radix {
+ /// Returns a reasonable digit group size for this radix.
+ #[must_use]
+ fn suggest_grouping(self) -> usize {
+ match self {
+ Self::Binary | Self::Hexadecimal => 4,
+ Self::Octal | Self::Decimal => 3,
+ }
+ }
+}
+
+/// A helper method to format numeric literals with digit grouping.
+/// `lit` must be a valid numeric literal without suffix.
+pub fn format(lit: &str, type_suffix: Option<&str>, float: bool) -> String {
+ NumericLiteral::new(lit, type_suffix, float).format()
+}
+
+#[derive(Debug)]
+pub struct NumericLiteral<'a> {
+ /// Which radix the literal was represented in.
+ pub radix: Radix,
+ /// The radix prefix, if present.
+ pub prefix: Option<&'a str>,
+
+ /// The integer part of the number.
+ pub integer: &'a str,
+ /// The fraction part of the number.
+ pub fraction: Option<&'a str>,
+ /// The exponent separator (b'e' or b'E') including preceding underscore if present
+ /// and the exponent part.
+ pub exponent: Option<(&'a str, &'a str)>,
+
+ /// The type suffix, including preceding underscore if present.
+ pub suffix: Option<&'a str>,
+}
+
+impl<'a> NumericLiteral<'a> {
+ pub fn from_lit(src: &'a str, lit: &Lit) -> Option<NumericLiteral<'a>> {
+ NumericLiteral::from_lit_kind(src, &lit.kind)
+ }
+
+ pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> {
+ let unsigned_src = src.strip_prefix('-').map_or(src, |s| s);
+ if lit_kind.is_numeric()
+ && unsigned_src
+ .trim_start()
+ .chars()
+ .next()
+ .map_or(false, |c| c.is_ascii_digit())
+ {
+ let (unsuffixed, suffix) = split_suffix(src, lit_kind);
+ let float = matches!(lit_kind, LitKind::Float(..));
+ Some(NumericLiteral::new(unsuffixed, suffix, float))
+ } else {
+ None
+ }
+ }
+
+ #[must_use]
+ pub fn new(lit: &'a str, suffix: Option<&'a str>, float: bool) -> Self {
++ let unsigned_lit = lit.trim_start_matches('-');
+ // Determine delimiter for radix prefix, if present, and radix.
- } else if lit.starts_with("0b") {
++ let radix = if unsigned_lit.starts_with("0x") {
+ Radix::Hexadecimal
- } else if lit.starts_with("0o") {
++ } else if unsigned_lit.starts_with("0b") {
+ Radix::Binary
++ } else if unsigned_lit.starts_with("0o") {
+ Radix::Octal
+ } else {
+ Radix::Decimal
+ };
+
+ // Grab part of the literal after prefix, if present.
+ let (prefix, mut sans_prefix) = if radix == Radix::Decimal {
+ (None, lit)
+ } else {
+ let (p, s) = lit.split_at(2);
+ (Some(p), s)
+ };
+
+ if suffix.is_some() && sans_prefix.ends_with('_') {
+ // The '_' before the suffix isn't part of the digits
+ sans_prefix = &sans_prefix[..sans_prefix.len() - 1];
+ }
+
+ let (integer, fraction, exponent) = Self::split_digit_parts(sans_prefix, float);
+
+ Self {
+ radix,
+ prefix,
+ integer,
+ fraction,
+ exponent,
+ suffix,
+ }
+ }
+
+ pub fn is_decimal(&self) -> bool {
+ self.radix == Radix::Decimal
+ }
+
+ pub fn split_digit_parts(digits: &str, float: bool) -> (&str, Option<&str>, Option<(&str, &str)>) {
+ let mut integer = digits;
+ let mut fraction = None;
+ let mut exponent = None;
+
+ if float {
+ for (i, c) in digits.char_indices() {
+ match c {
+ '.' => {
+ integer = &digits[..i];
+ fraction = Some(&digits[i + 1..]);
+ },
+ 'e' | 'E' => {
+ let exp_start = if digits[..i].ends_with('_') { i - 1 } else { i };
+
+ if integer.len() > exp_start {
+ integer = &digits[..exp_start];
+ } else {
+ fraction = Some(&digits[integer.len() + 1..exp_start]);
+ };
+ exponent = Some((&digits[exp_start..=i], &digits[i + 1..]));
+ break;
+ },
+ _ => {},
+ }
+ }
+ }
+
+ (integer, fraction, exponent)
+ }
+
+ /// Returns literal formatted in a sensible way.
+ pub fn format(&self) -> String {
+ let mut output = String::new();
+
+ if let Some(prefix) = self.prefix {
+ output.push_str(prefix);
+ }
+
+ let group_size = self.radix.suggest_grouping();
+
+ Self::group_digits(
+ &mut output,
+ self.integer,
+ group_size,
+ true,
+ self.radix == Radix::Hexadecimal,
+ );
+
+ if let Some(fraction) = self.fraction {
+ output.push('.');
+ Self::group_digits(&mut output, fraction, group_size, false, false);
+ }
+
+ if let Some((separator, exponent)) = self.exponent {
+ if exponent != "0" {
+ output.push_str(separator);
+ Self::group_digits(&mut output, exponent, group_size, true, false);
+ }
+ }
+
+ if let Some(suffix) = self.suffix {
+ if output.ends_with('.') {
+ output.push('0');
+ }
+ output.push('_');
+ output.push_str(suffix);
+ }
+
+ output
+ }
+
+ pub fn group_digits(output: &mut String, input: &str, group_size: usize, partial_group_first: bool, pad: bool) {
+ debug_assert!(group_size > 0);
+
+ let mut digits = input.chars().filter(|&c| c != '_');
+
+ // The exponent may have a sign, output it early, otherwise it will be
+ // treated as a digit
+ if digits.clone().next() == Some('-') {
+ let _ = digits.next();
+ output.push('-');
+ }
+
+ let first_group_size;
+
+ if partial_group_first {
+ first_group_size = (digits.clone().count() - 1) % group_size + 1;
+ if pad {
+ for _ in 0..group_size - first_group_size {
+ output.push('0');
+ }
+ }
+ } else {
+ first_group_size = group_size;
+ }
+
+ for _ in 0..first_group_size {
+ if let Some(digit) = digits.next() {
+ output.push(digit);
+ }
+ }
+
+ for (c, i) in iter::zip(digits, (0..group_size).cycle()) {
+ if i == 0 {
+ output.push('_');
+ }
+ output.push(c);
+ }
+ }
+}
+
+fn split_suffix<'a>(src: &'a str, lit_kind: &LitKind) -> (&'a str, Option<&'a str>) {
+ debug_assert!(lit_kind.is_numeric());
+ lit_suffix_length(lit_kind)
+ .and_then(|suffix_length| src.len().checked_sub(suffix_length))
+ .map_or((src, None), |split_pos| {
+ let (unsuffixed, suffix) = src.split_at(split_pos);
+ (unsuffixed, Some(suffix))
+ })
+}
+
+fn lit_suffix_length(lit_kind: &LitKind) -> Option<usize> {
+ debug_assert!(lit_kind.is_numeric());
+ let suffix = match lit_kind {
+ LitKind::Int(_, int_lit_kind) => match int_lit_kind {
+ LitIntType::Signed(int_ty) => Some(int_ty.name_str()),
+ LitIntType::Unsigned(uint_ty) => Some(uint_ty.name_str()),
+ LitIntType::Unsuffixed => None,
+ },
+ LitKind::Float(_, float_lit_kind) => match float_lit_kind {
+ LitFloatType::Suffixed(float_ty) => Some(float_ty.name_str()),
+ LitFloatType::Unsuffixed => None,
+ },
+ _ => None,
+ };
+
+ suffix.map(str::len)
+}
--- /dev/null
- pub const ASMUT_TRAIT: [&str; 3] = ["core", "convert", "AsMut"];
- pub const ASREF_TRAIT: [&str; 3] = ["core", "convert", "AsRef"];
+//! This module contains paths to types and functions Clippy needs to know
+//! about.
+//!
+//! Whenever possible, please consider diagnostic items over hardcoded paths.
+//! See <https://github.com/rust-lang/rust-clippy/issues/5393> for more information.
+
+#[cfg(feature = "internal")]
+pub const APPLICABILITY: [&str; 2] = ["rustc_lint_defs", "Applicability"];
+#[cfg(feature = "internal")]
+pub const APPLICABILITY_VALUES: [[&str; 3]; 4] = [
+ ["rustc_lint_defs", "Applicability", "Unspecified"],
+ ["rustc_lint_defs", "Applicability", "HasPlaceholders"],
+ ["rustc_lint_defs", "Applicability", "MaybeIncorrect"],
+ ["rustc_lint_defs", "Applicability", "MachineApplicable"],
+];
+#[cfg(feature = "internal")]
+pub const DIAGNOSTIC_BUILDER: [&str; 3] = ["rustc_errors", "diagnostic_builder", "DiagnosticBuilder"];
+pub const ARC_PTR_EQ: [&str; 4] = ["alloc", "sync", "Arc", "ptr_eq"];
- pub const BTREEMAP_ENTRY: [&str; 6] = ["alloc", "collections", "btree", "map", "entry", "Entry"];
+pub const BTREEMAP_CONTAINS_KEY: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "contains_key"];
- pub const COW: [&str; 3] = ["alloc", "borrow", "Cow"];
+pub const BTREEMAP_INSERT: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "insert"];
+pub const BTREESET_ITER: [&str; 6] = ["alloc", "collections", "btree", "set", "BTreeSet", "iter"];
+pub const CLONE_TRAIT_METHOD: [&str; 4] = ["core", "clone", "Clone", "clone"];
- pub const CORE_ITER_INTO_ITER: [&str; 6] = ["core", "iter", "traits", "collect", "IntoIterator", "into_iter"];
+pub const CORE_ITER_COLLECT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "collect"];
+pub const CORE_ITER_CLONED: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "cloned"];
+pub const CORE_ITER_COPIED: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "copied"];
+pub const CORE_ITER_FILTER: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "filter"];
- /// Preferably use the diagnostic item `sym::deref_method` where possible
- pub const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
- pub const DISPLAY_TRAIT: [&str; 3] = ["core", "fmt", "Display"];
+pub const CSTRING_AS_C_STR: [&str; 5] = ["alloc", "ffi", "c_str", "CString", "as_c_str"];
+pub const DEFAULT_TRAIT_METHOD: [&str; 4] = ["core", "default", "Default", "default"];
+pub const DEREF_MUT_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "DerefMut", "deref_mut"];
- pub const FILE: [&str; 3] = ["std", "fs", "File"];
- pub const FILE_TYPE: [&str; 3] = ["std", "fs", "FileType"];
- pub const FROM_FROM: [&str; 4] = ["core", "convert", "From", "from"];
+#[cfg(feature = "internal")]
+pub const EARLY_CONTEXT: [&str; 2] = ["rustc_lint", "EarlyContext"];
+#[cfg(feature = "internal")]
+pub const EARLY_LINT_PASS: [&str; 3] = ["rustc_lint", "passes", "EarlyLintPass"];
+pub const EXIT: [&str; 3] = ["std", "process", "exit"];
+pub const F32_EPSILON: [&str; 4] = ["core", "f32", "<impl f32>", "EPSILON"];
+pub const F64_EPSILON: [&str; 4] = ["core", "f64", "<impl f64>", "EPSILON"];
- pub const FUTURE_FROM_GENERATOR: [&str; 3] = ["core", "future", "from_generator"];
+pub const FROM_ITERATOR_METHOD: [&str; 6] = ["core", "iter", "traits", "collect", "FromIterator", "from_iter"];
+pub const FROM_STR_METHOD: [&str; 5] = ["core", "str", "traits", "FromStr", "from_str"];
- pub const HASHMAP_ENTRY: [&str; 5] = ["std", "collections", "hash", "map", "Entry"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const FUTURES_IO_ASYNCREADEXT: [&str; 3] = ["futures_util", "io", "AsyncReadExt"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const FUTURES_IO_ASYNCWRITEEXT: [&str; 3] = ["futures_util", "io", "AsyncWriteExt"];
+pub const HASHMAP_CONTAINS_KEY: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "contains_key"];
- pub const INDEX: [&str; 3] = ["core", "ops", "Index"];
- pub const INDEX_MUT: [&str; 3] = ["core", "ops", "IndexMut"];
+pub const HASHMAP_INSERT: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "insert"];
+pub const HASHSET_ITER: [&str; 6] = ["std", "collections", "hash", "set", "HashSet", "iter"];
+#[cfg(feature = "internal")]
+pub const IDENT: [&str; 3] = ["rustc_span", "symbol", "Ident"];
+#[cfg(feature = "internal")]
+pub const IDENT_AS_STR: [&str; 4] = ["rustc_span", "symbol", "Ident", "as_str"];
- pub const ITER_REPEAT: [&str; 5] = ["core", "iter", "sources", "repeat", "repeat"];
+pub const INSERT_STR: [&str; 4] = ["alloc", "string", "String", "insert_str"];
+pub const ITER_COUNT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "count"];
+pub const ITER_EMPTY: [&str; 5] = ["core", "iter", "sources", "empty", "Empty"];
- pub const MUTEX_GUARD: [&str; 4] = ["std", "sync", "mutex", "MutexGuard"];
+pub const ITERTOOLS_NEXT_TUPLE: [&str; 3] = ["itertools", "Itertools", "next_tuple"];
+#[cfg(feature = "internal")]
+pub const KW_MODULE: [&str; 3] = ["rustc_span", "symbol", "kw"];
+#[cfg(feature = "internal")]
+pub const LATE_CONTEXT: [&str; 2] = ["rustc_lint", "LateContext"];
+#[cfg(feature = "internal")]
+pub const LATE_LINT_PASS: [&str; 3] = ["rustc_lint", "passes", "LateLintPass"];
+#[cfg(feature = "internal")]
+pub const LINT: [&str; 2] = ["rustc_lint_defs", "Lint"];
+pub const MEM_SWAP: [&str; 3] = ["core", "mem", "swap"];
- /// Preferably use the diagnostic item `sym::Option` where possible
- pub const OPTION: [&str; 3] = ["core", "option", "Option"];
- pub const OPTION_NONE: [&str; 4] = ["core", "option", "Option", "None"];
- pub const OPTION_SOME: [&str; 4] = ["core", "option", "Option", "Some"];
- pub const ORD: [&str; 3] = ["core", "cmp", "Ord"];
+pub const OPEN_OPTIONS: [&str; 3] = ["std", "fs", "OpenOptions"];
- pub const POLL_PENDING: [&str; 5] = ["core", "task", "poll", "Poll", "Pending"];
- pub const POLL_READY: [&str; 5] = ["core", "task", "poll", "Poll", "Ready"];
+pub const OS_STRING_AS_OS_STR: [&str; 5] = ["std", "ffi", "os_str", "OsString", "as_os_str"];
+pub const OS_STR_TO_OS_STRING: [&str; 5] = ["std", "ffi", "os_str", "OsStr", "to_os_string"];
+pub const PARKING_LOT_MUTEX_GUARD: [&str; 3] = ["lock_api", "mutex", "MutexGuard"];
+pub const PARKING_LOT_RWLOCK_READ_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockReadGuard"];
+pub const PARKING_LOT_RWLOCK_WRITE_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockWriteGuard"];
+pub const PATH_BUF_AS_PATH: [&str; 4] = ["std", "path", "PathBuf", "as_path"];
+pub const PATH_TO_PATH_BUF: [&str; 4] = ["std", "path", "Path", "to_path_buf"];
+pub const PEEKABLE: [&str; 5] = ["core", "iter", "adapters", "peekable", "Peekable"];
+pub const PERMISSIONS: [&str; 3] = ["std", "fs", "Permissions"];
+#[cfg_attr(not(unix), allow(clippy::invalid_paths))]
+pub const PERMISSIONS_FROM_MODE: [&str; 6] = ["std", "os", "unix", "fs", "PermissionsExt", "from_mode"];
+pub const POLL: [&str; 4] = ["core", "task", "poll", "Poll"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const PTR_COPY: [&str; 3] = ["core", "intrinsics", "copy"];
+pub const PTR_COPY_NONOVERLAPPING: [&str; 3] = ["core", "intrinsics", "copy_nonoverlapping"];
+pub const PTR_EQ: [&str; 3] = ["core", "ptr", "eq"];
+pub const PTR_SLICE_FROM_RAW_PARTS: [&str; 3] = ["core", "ptr", "slice_from_raw_parts"];
+pub const PTR_SLICE_FROM_RAW_PARTS_MUT: [&str; 3] = ["core", "ptr", "slice_from_raw_parts_mut"];
+pub const PTR_SWAP_NONOVERLAPPING: [&str; 3] = ["core", "ptr", "swap_nonoverlapping"];
+pub const PTR_READ: [&str; 3] = ["core", "ptr", "read"];
+pub const PTR_READ_UNALIGNED: [&str; 3] = ["core", "ptr", "read_unaligned"];
+pub const PTR_READ_VOLATILE: [&str; 3] = ["core", "ptr", "read_volatile"];
+pub const PTR_REPLACE: [&str; 3] = ["core", "ptr", "replace"];
+pub const PTR_SWAP: [&str; 3] = ["core", "ptr", "swap"];
+pub const PTR_UNALIGNED_VOLATILE_LOAD: [&str; 3] = ["core", "intrinsics", "unaligned_volatile_load"];
+pub const PTR_UNALIGNED_VOLATILE_STORE: [&str; 3] = ["core", "intrinsics", "unaligned_volatile_store"];
+pub const PTR_WRITE: [&str; 3] = ["core", "ptr", "write"];
+pub const PTR_WRITE_BYTES: [&str; 3] = ["core", "intrinsics", "write_bytes"];
+pub const PTR_WRITE_UNALIGNED: [&str; 3] = ["core", "ptr", "write_unaligned"];
+pub const PTR_WRITE_VOLATILE: [&str; 3] = ["core", "ptr", "write_volatile"];
+pub const PUSH_STR: [&str; 4] = ["alloc", "string", "String", "push_str"];
+pub const RANGE_ARGUMENT_TRAIT: [&str; 3] = ["core", "ops", "RangeBounds"];
+pub const RC_PTR_EQ: [&str; 4] = ["alloc", "rc", "Rc", "ptr_eq"];
+pub const REFCELL_REF: [&str; 3] = ["core", "cell", "Ref"];
+pub const REFCELL_REFMUT: [&str; 3] = ["core", "cell", "RefMut"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "unicode", "RegexBuilder", "new"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "bytes", "RegexBuilder", "new"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_NEW: [&str; 4] = ["regex", "re_bytes", "Regex", "new"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_SET_NEW: [&str; 5] = ["regex", "re_set", "bytes", "RegexSet", "new"];
- #[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_NEW: [&str; 4] = ["regex", "re_unicode", "Regex", "new"];
- /// Preferably use the diagnostic item `sym::Result` where possible
- pub const RESULT: [&str; 3] = ["core", "result", "Result"];
- pub const RESULT_ERR: [&str; 4] = ["core", "result", "Result", "Err"];
- pub const RESULT_OK: [&str; 4] = ["core", "result", "Result", "Ok"];
+pub const REGEX_SET_NEW: [&str; 5] = ["regex", "re_set", "unicode", "RegexSet", "new"];
- pub const RWLOCK_READ_GUARD: [&str; 4] = ["std", "sync", "rwlock", "RwLockReadGuard"];
- pub const RWLOCK_WRITE_GUARD: [&str; 4] = ["std", "sync", "rwlock", "RwLockWriteGuard"];
+#[cfg(feature = "internal")]
+pub const RUSTC_VERSION: [&str; 2] = ["rustc_semver", "RustcVersion"];
+pub const SERDE_DESERIALIZE: [&str; 3] = ["serde", "de", "Deserialize"];
+pub const SERDE_DE_VISITOR: [&str; 3] = ["serde", "de", "Visitor"];
+pub const SLICE_FROM_RAW_PARTS: [&str; 4] = ["core", "slice", "raw", "from_raw_parts"];
+pub const SLICE_FROM_RAW_PARTS_MUT: [&str; 4] = ["core", "slice", "raw", "from_raw_parts_mut"];
+pub const SLICE_GET: [&str; 4] = ["core", "slice", "<impl [T]>", "get"];
+pub const SLICE_INTO_VEC: [&str; 4] = ["alloc", "slice", "<impl [T]>", "into_vec"];
+pub const SLICE_INTO: [&str; 4] = ["core", "slice", "<impl [T]>", "iter"];
+pub const SLICE_ITER: [&str; 4] = ["core", "slice", "iter", "Iter"];
+pub const STDERR: [&str; 4] = ["std", "io", "stdio", "stderr"];
+pub const STDOUT: [&str; 4] = ["std", "io", "stdio", "stdout"];
+pub const CONVERT_IDENTITY: [&str; 3] = ["core", "convert", "identity"];
+pub const STD_FS_CREATE_DIR: [&str; 3] = ["std", "fs", "create_dir"];
+pub const STRING_AS_MUT_STR: [&str; 4] = ["alloc", "string", "String", "as_mut_str"];
+pub const STRING_AS_STR: [&str; 4] = ["alloc", "string", "String", "as_str"];
+pub const STRING_NEW: [&str; 4] = ["alloc", "string", "String", "new"];
+pub const STR_BYTES: [&str; 4] = ["core", "str", "<impl str>", "bytes"];
+pub const STR_CHARS: [&str; 4] = ["core", "str", "<impl str>", "chars"];
+pub const STR_ENDS_WITH: [&str; 4] = ["core", "str", "<impl str>", "ends_with"];
+pub const STR_FROM_UTF8: [&str; 4] = ["core", "str", "converts", "from_utf8"];
+pub const STR_FROM_UTF8_UNCHECKED: [&str; 4] = ["core", "str", "converts", "from_utf8_unchecked"];
+pub const STR_LEN: [&str; 4] = ["core", "str", "<impl str>", "len"];
+pub const STR_STARTS_WITH: [&str; 4] = ["core", "str", "<impl str>", "starts_with"];
+#[cfg(feature = "internal")]
+pub const SYMBOL: [&str; 3] = ["rustc_span", "symbol", "Symbol"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_AS_STR: [&str; 4] = ["rustc_span", "symbol", "Symbol", "as_str"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_INTERN: [&str; 4] = ["rustc_span", "symbol", "Symbol", "intern"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_TO_IDENT_STRING: [&str; 4] = ["rustc_span", "symbol", "Symbol", "to_ident_string"];
+#[cfg(feature = "internal")]
+pub const SYM_MODULE: [&str; 3] = ["rustc_span", "symbol", "sym"];
+#[cfg(feature = "internal")]
+pub const SYNTAX_CONTEXT: [&str; 3] = ["rustc_span", "hygiene", "SyntaxContext"];
+pub const TO_OWNED_METHOD: [&str; 4] = ["alloc", "borrow", "ToOwned", "to_owned"];
+pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const TOKIO_IO_ASYNCREADEXT: [&str; 5] = ["tokio", "io", "util", "async_read_ext", "AsyncReadExt"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const TOKIO_IO_ASYNCWRITEEXT: [&str; 5] = ["tokio", "io", "util", "async_write_ext", "AsyncWriteExt"];
+pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"];
+pub const VEC_AS_MUT_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_mut_slice"];
+pub const VEC_AS_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_slice"];
+pub const VEC_DEQUE_ITER: [&str; 5] = ["alloc", "collections", "vec_deque", "VecDeque", "iter"];
+pub const VEC_FROM_ELEM: [&str; 3] = ["alloc", "vec", "from_elem"];
+pub const VEC_NEW: [&str; 4] = ["alloc", "vec", "Vec", "new"];
+pub const VEC_RESIZE: [&str; 4] = ["alloc", "vec", "Vec", "resize"];
+pub const WEAK_ARC: [&str; 3] = ["alloc", "sync", "Weak"];
+pub const WEAK_RC: [&str; 3] = ["alloc", "rc", "Weak"];
+pub const PTR_NON_NULL: [&str; 4] = ["core", "ptr", "non_null", "NonNull"];
+pub const INSTANT_NOW: [&str; 4] = ["std", "time", "Instant", "now"];
+pub const INSTANT: [&str; 3] = ["std", "time", "Instant"];
--- /dev/null
- use crate::source::{snippet, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite};
+//! Contains utility functions to generate suggestions.
+#![deny(clippy::missing_docs_in_private_items)]
+
- let snip = snippet_with_applicability(cx, expr.span, default, applicability);
++use crate::source::{
++ snippet, snippet_opt, snippet_with_applicability, snippet_with_context, snippet_with_macro_callsite,
++};
+use crate::ty::expr_sig;
+use crate::{get_parent_expr_for_hir, higher};
+use rustc_ast::util::parser::AssocOp;
+use rustc_ast::{ast, token};
+use rustc_ast_pretty::pprust::token_kind_to_string;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::{Closure, ExprKind, HirId, MutTy, TyKind};
+use rustc_hir_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::{EarlyContext, LateContext, LintContext};
+use rustc_middle::hir::place::ProjectionKind;
+use rustc_middle::mir::{FakeReadCause, Mutability};
+use rustc_middle::ty;
+use rustc_span::source_map::{BytePos, CharPos, Pos, Span, SyntaxContext};
+use std::borrow::Cow;
+use std::fmt::{Display, Write as _};
+use std::ops::{Add, Neg, Not, Sub};
+
+/// A helper type to build suggestion correctly handling parentheses.
+#[derive(Clone, Debug, PartialEq)]
+pub enum Sugg<'a> {
+ /// An expression that never needs parentheses such as `1337` or `[0; 42]`.
+ NonParen(Cow<'a, str>),
+ /// An expression that does not fit in other variants.
+ MaybeParen(Cow<'a, str>),
+ /// A binary operator expression, including `as`-casts and explicit type
+ /// coercion.
+ BinOp(AssocOp, Cow<'a, str>, Cow<'a, str>),
+}
+
+/// Literal constant `0`, for convenience.
+pub const ZERO: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("0"));
+/// Literal constant `1`, for convenience.
+pub const ONE: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("1"));
+/// a constant represents an empty string, for convenience.
+pub const EMPTY: Sugg<'static> = Sugg::NonParen(Cow::Borrowed(""));
+
+impl Display for Sugg<'_> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ match *self {
+ Sugg::NonParen(ref s) | Sugg::MaybeParen(ref s) => s.fmt(f),
+ Sugg::BinOp(op, ref lhs, ref rhs) => binop_to_string(op, lhs, rhs).fmt(f),
+ }
+ }
+}
+
+#[expect(clippy::wrong_self_convention)] // ok, because of the function `as_ty` method
+impl<'a> Sugg<'a> {
+ /// Prepare a suggestion from an expression.
+ pub fn hir_opt(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Self> {
+ let get_snippet = |span| snippet(cx, span, "");
+ snippet_opt(cx, expr.span).map(|_| Self::hir_from_snippet(expr, get_snippet))
+ }
+
+ /// Convenience function around `hir_opt` for suggestions with a default
+ /// text.
+ pub fn hir(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ Self::hir_opt(cx, expr).unwrap_or(Sugg::NonParen(Cow::Borrowed(default)))
+ }
+
+ /// Same as `hir`, but it adapts the applicability level by following rules:
+ ///
+ /// - Applicability level `Unspecified` will never be changed.
+ /// - If the span is inside a macro, change the applicability level to `MaybeIncorrect`.
+ /// - If the default value is used and the applicability level is `MachineApplicable`, change it
+ /// to
+ /// `HasPlaceholders`
+ pub fn hir_with_applicability(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if *applicability != Applicability::Unspecified && expr.span.from_expansion() {
+ *applicability = Applicability::MaybeIncorrect;
+ }
+ Self::hir_opt(cx, expr).unwrap_or_else(|| {
+ if *applicability == Applicability::MachineApplicable {
+ *applicability = Applicability::HasPlaceholders;
+ }
+ Sugg::NonParen(Cow::Borrowed(default))
+ })
+ }
+
+ /// Same as `hir`, but will use the pre expansion span if the `expr` was in a macro.
+ pub fn hir_with_macro_callsite(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ let get_snippet = |span| snippet_with_macro_callsite(cx, span, default);
+ Self::hir_from_snippet(expr, get_snippet)
+ }
+
+ /// Same as `hir`, but first walks the span up to the given context. This will result in the
+ /// macro call, rather then the expansion, if the span is from a child context. If the span is
+ /// not from a child context, it will be used directly instead.
+ ///
+ /// e.g. Given the expression `&vec![]`, getting a snippet from the span for `vec![]` as a HIR
+ /// node would result in `box []`. If given the context of the address of expression, this
+ /// function will correctly get a snippet of `vec![]`.
+ pub fn hir_with_context(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ ctxt: SyntaxContext,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if expr.span.ctxt() == ctxt {
+ Self::hir_from_snippet(expr, |span| snippet(cx, span, default))
+ } else {
- fn fake_read(
- &mut self,
- _: &rustc_hir_typeck::expr_use_visitor::PlaceWithHirId<'tcx>,
- _: FakeReadCause,
- _: HirId,
- ) {}
++ let (snip, _) = snippet_with_context(cx, expr.span, ctxt, default, applicability);
+ Sugg::NonParen(snip)
+ }
+ }
+
+ /// Generate a suggestion for an expression with the given snippet. This is used by the `hir_*`
+ /// function variants of `Sugg`, since these use different snippet functions.
+ fn hir_from_snippet(expr: &hir::Expr<'_>, get_snippet: impl Fn(Span) -> Cow<'a, str>) -> Self {
+ if let Some(range) = higher::Range::hir(expr) {
+ let op = match range.limits {
+ ast::RangeLimits::HalfOpen => AssocOp::DotDot,
+ ast::RangeLimits::Closed => AssocOp::DotDotEq,
+ };
+ let start = range.start.map_or("".into(), |expr| get_snippet(expr.span));
+ let end = range.end.map_or("".into(), |expr| get_snippet(expr.span));
+
+ return Sugg::BinOp(op, start, end);
+ }
+
+ match expr.kind {
+ hir::ExprKind::AddrOf(..)
+ | hir::ExprKind::Box(..)
+ | hir::ExprKind::If(..)
+ | hir::ExprKind::Let(..)
+ | hir::ExprKind::Closure { .. }
+ | hir::ExprKind::Unary(..)
+ | hir::ExprKind::Match(..) => Sugg::MaybeParen(get_snippet(expr.span)),
+ hir::ExprKind::Continue(..)
+ | hir::ExprKind::Yield(..)
+ | hir::ExprKind::Array(..)
+ | hir::ExprKind::Block(..)
+ | hir::ExprKind::Break(..)
+ | hir::ExprKind::Call(..)
+ | hir::ExprKind::Field(..)
+ | hir::ExprKind::Index(..)
+ | hir::ExprKind::InlineAsm(..)
+ | hir::ExprKind::ConstBlock(..)
+ | hir::ExprKind::Lit(..)
+ | hir::ExprKind::Loop(..)
+ | hir::ExprKind::MethodCall(..)
+ | hir::ExprKind::Path(..)
+ | hir::ExprKind::Repeat(..)
+ | hir::ExprKind::Ret(..)
+ | hir::ExprKind::Struct(..)
+ | hir::ExprKind::Tup(..)
+ | hir::ExprKind::Err => Sugg::NonParen(get_snippet(expr.span)),
+ hir::ExprKind::DropTemps(inner) => Self::hir_from_snippet(inner, get_snippet),
+ hir::ExprKind::Assign(lhs, rhs, _) => {
+ Sugg::BinOp(AssocOp::Assign, get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::AssignOp(op, lhs, rhs) => {
+ Sugg::BinOp(hirbinop2assignop(op), get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node.into()),
+ get_snippet(lhs.span),
+ get_snippet(rhs.span),
+ ),
+ hir::ExprKind::Cast(lhs, ty) => Sugg::BinOp(AssocOp::As, get_snippet(lhs.span), get_snippet(ty.span)),
+ hir::ExprKind::Type(lhs, ty) => Sugg::BinOp(AssocOp::Colon, get_snippet(lhs.span), get_snippet(ty.span)),
+ }
+ }
+
+ /// Prepare a suggestion from an expression.
+ pub fn ast(cx: &EarlyContext<'_>, expr: &ast::Expr, default: &'a str) -> Self {
+ use rustc_ast::ast::RangeLimits;
+
+ let snippet_without_expansion = |cx, span: Span, default| {
+ if span.from_expansion() {
+ snippet_with_macro_callsite(cx, span, default)
+ } else {
+ snippet(cx, span, default)
+ }
+ };
+
+ match expr.kind {
+ ast::ExprKind::AddrOf(..)
+ | ast::ExprKind::Box(..)
+ | ast::ExprKind::Closure { .. }
+ | ast::ExprKind::If(..)
+ | ast::ExprKind::Let(..)
+ | ast::ExprKind::Unary(..)
+ | ast::ExprKind::Match(..) => Sugg::MaybeParen(snippet_without_expansion(cx, expr.span, default)),
+ ast::ExprKind::Async(..)
+ | ast::ExprKind::Block(..)
+ | ast::ExprKind::Break(..)
+ | ast::ExprKind::Call(..)
+ | ast::ExprKind::Continue(..)
+ | ast::ExprKind::Yield(..)
+ | ast::ExprKind::Field(..)
+ | ast::ExprKind::ForLoop(..)
+ | ast::ExprKind::Index(..)
+ | ast::ExprKind::InlineAsm(..)
+ | ast::ExprKind::ConstBlock(..)
+ | ast::ExprKind::Lit(..)
+ | ast::ExprKind::Loop(..)
+ | ast::ExprKind::MacCall(..)
+ | ast::ExprKind::MethodCall(..)
+ | ast::ExprKind::Paren(..)
+ | ast::ExprKind::Underscore
+ | ast::ExprKind::Path(..)
+ | ast::ExprKind::Repeat(..)
+ | ast::ExprKind::Ret(..)
+ | ast::ExprKind::Yeet(..)
+ | ast::ExprKind::Struct(..)
+ | ast::ExprKind::Try(..)
+ | ast::ExprKind::TryBlock(..)
+ | ast::ExprKind::Tup(..)
+ | ast::ExprKind::Array(..)
+ | ast::ExprKind::While(..)
+ | ast::ExprKind::Await(..)
+ | ast::ExprKind::Err => Sugg::NonParen(snippet_without_expansion(cx, expr.span, default)),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::HalfOpen) => Sugg::BinOp(
+ AssocOp::DotDot,
+ lhs.as_ref()
+ .map_or("".into(), |lhs| snippet_without_expansion(cx, lhs.span, default)),
+ rhs.as_ref()
+ .map_or("".into(), |rhs| snippet_without_expansion(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::Closed) => Sugg::BinOp(
+ AssocOp::DotDotEq,
+ lhs.as_ref()
+ .map_or("".into(), |lhs| snippet_without_expansion(cx, lhs.span, default)),
+ rhs.as_ref()
+ .map_or("".into(), |rhs| snippet_without_expansion(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Assign(ref lhs, ref rhs, _) => Sugg::BinOp(
+ AssocOp::Assign,
+ snippet_without_expansion(cx, lhs.span, default),
+ snippet_without_expansion(cx, rhs.span, default),
+ ),
+ ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => Sugg::BinOp(
+ astbinop2assignop(op),
+ snippet_without_expansion(cx, lhs.span, default),
+ snippet_without_expansion(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Binary(op, ref lhs, ref rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node),
+ snippet_without_expansion(cx, lhs.span, default),
+ snippet_without_expansion(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Cast(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::As,
+ snippet_without_expansion(cx, lhs.span, default),
+ snippet_without_expansion(cx, ty.span, default),
+ ),
+ ast::ExprKind::Type(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::Colon,
+ snippet_without_expansion(cx, lhs.span, default),
+ snippet_without_expansion(cx, ty.span, default),
+ ),
+ }
+ }
+
+ /// Convenience method to create the `<lhs> && <rhs>` suggestion.
+ pub fn and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::And, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> & <rhs>` suggestion.
+ pub fn bit_and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::BitAnd, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> as <rhs>` suggestion.
+ pub fn as_ty<R: Display>(self, rhs: R) -> Sugg<'static> {
+ make_assoc(AssocOp::As, &self, &Sugg::NonParen(rhs.to_string().into()))
+ }
+
+ /// Convenience method to create the `&<expr>` suggestion.
+ pub fn addr(self) -> Sugg<'static> {
+ make_unop("&", self)
+ }
+
+ /// Convenience method to create the `&mut <expr>` suggestion.
+ pub fn mut_addr(self) -> Sugg<'static> {
+ make_unop("&mut ", self)
+ }
+
+ /// Convenience method to create the `*<expr>` suggestion.
+ pub fn deref(self) -> Sugg<'static> {
+ make_unop("*", self)
+ }
+
+ /// Convenience method to create the `&*<expr>` suggestion. Currently this
+ /// is needed because `sugg.deref().addr()` produces an unnecessary set of
+ /// parentheses around the deref.
+ pub fn addr_deref(self) -> Sugg<'static> {
+ make_unop("&*", self)
+ }
+
+ /// Convenience method to create the `&mut *<expr>` suggestion. Currently
+ /// this is needed because `sugg.deref().mut_addr()` produces an unnecessary
+ /// set of parentheses around the deref.
+ pub fn mut_addr_deref(self) -> Sugg<'static> {
+ make_unop("&mut *", self)
+ }
+
+ /// Convenience method to transform suggestion into a return call
+ pub fn make_return(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("return {self}")))
+ }
+
+ /// Convenience method to transform suggestion into a block
+ /// where the suggestion is a trailing expression
+ pub fn blockify(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("{{ {self} }}")))
+ }
+
+ /// Convenience method to prefix the expression with the `async` keyword.
+ /// Can be used after `blockify` to create an async block.
+ pub fn asyncify(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("async {self}")))
+ }
+
+ /// Convenience method to create the `<lhs>..<rhs>` or `<lhs>...<rhs>`
+ /// suggestion.
+ pub fn range(self, end: &Self, limit: ast::RangeLimits) -> Sugg<'static> {
+ match limit {
+ ast::RangeLimits::HalfOpen => make_assoc(AssocOp::DotDot, &self, end),
+ ast::RangeLimits::Closed => make_assoc(AssocOp::DotDotEq, &self, end),
+ }
+ }
+
+ /// Adds parentheses to any expression that might need them. Suitable to the
+ /// `self` argument of a method call
+ /// (e.g., to build `bar.foo()` or `(1 + 2).foo()`).
+ #[must_use]
+ pub fn maybe_par(self) -> Self {
+ match self {
+ Sugg::NonParen(..) => self,
+ // `(x)` and `(x).y()` both don't need additional parens.
+ Sugg::MaybeParen(sugg) => {
+ if has_enclosing_paren(&sugg) {
+ Sugg::MaybeParen(sugg)
+ } else {
+ Sugg::NonParen(format!("({sugg})").into())
+ }
+ },
+ Sugg::BinOp(op, lhs, rhs) => {
+ let sugg = binop_to_string(op, &lhs, &rhs);
+ Sugg::NonParen(format!("({sugg})").into())
+ },
+ }
+ }
+}
+
+/// Generates a string from the operator and both sides.
+fn binop_to_string(op: AssocOp, lhs: &str, rhs: &str) -> String {
+ match op {
+ AssocOp::Add
+ | AssocOp::Subtract
+ | AssocOp::Multiply
+ | AssocOp::Divide
+ | AssocOp::Modulus
+ | AssocOp::LAnd
+ | AssocOp::LOr
+ | AssocOp::BitXor
+ | AssocOp::BitAnd
+ | AssocOp::BitOr
+ | AssocOp::ShiftLeft
+ | AssocOp::ShiftRight
+ | AssocOp::Equal
+ | AssocOp::Less
+ | AssocOp::LessEqual
+ | AssocOp::NotEqual
+ | AssocOp::Greater
+ | AssocOp::GreaterEqual => {
+ format!(
+ "{lhs} {} {rhs}",
+ op.to_ast_binop().expect("Those are AST ops").to_string()
+ )
+ },
+ AssocOp::Assign => format!("{lhs} = {rhs}"),
+ AssocOp::AssignOp(op) => {
+ format!("{lhs} {}= {rhs}", token_kind_to_string(&token::BinOp(op)))
+ },
+ AssocOp::As => format!("{lhs} as {rhs}"),
+ AssocOp::DotDot => format!("{lhs}..{rhs}"),
+ AssocOp::DotDotEq => format!("{lhs}..={rhs}"),
+ AssocOp::Colon => format!("{lhs}: {rhs}"),
+ }
+}
+
+/// Return `true` if `sugg` is enclosed in parenthesis.
+pub fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
+ let mut chars = sugg.as_ref().chars();
+ if chars.next() == Some('(') {
+ let mut depth = 1;
+ for c in &mut chars {
+ if c == '(' {
+ depth += 1;
+ } else if c == ')' {
+ depth -= 1;
+ }
+ if depth == 0 {
+ break;
+ }
+ }
+ chars.next().is_none()
+ } else {
+ false
+ }
+}
+
+/// Copied from the rust standard library, and then edited
+macro_rules! forward_binop_impls_to_ref {
+ (impl $imp:ident, $method:ident for $t:ty, type Output = $o:ty) => {
+ impl $imp<$t> for &$t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(self, &other)
+ }
+ }
+
+ impl $imp<&$t> for $t {
+ type Output = $o;
+
+ fn $method(self, other: &$t) -> $o {
+ $imp::$method(&self, other)
+ }
+ }
+
+ impl $imp for $t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(&self, &other)
+ }
+ }
+ };
+}
+
+impl Add for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn add(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Add, self, rhs)
+ }
+}
+
+impl Sub for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn sub(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Sub, self, rhs)
+ }
+}
+
+forward_binop_impls_to_ref!(impl Add, add for Sugg<'_>, type Output = Sugg<'static>);
+forward_binop_impls_to_ref!(impl Sub, sub for Sugg<'_>, type Output = Sugg<'static>);
+
+impl Neg for Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn neg(self) -> Sugg<'static> {
+ make_unop("-", self)
+ }
+}
+
+impl<'a> Not for Sugg<'a> {
+ type Output = Sugg<'a>;
+ fn not(self) -> Sugg<'a> {
+ use AssocOp::{Equal, Greater, GreaterEqual, Less, LessEqual, NotEqual};
+
+ if let Sugg::BinOp(op, lhs, rhs) = self {
+ let to_op = match op {
+ Equal => NotEqual,
+ NotEqual => Equal,
+ Less => GreaterEqual,
+ GreaterEqual => Less,
+ Greater => LessEqual,
+ LessEqual => Greater,
+ _ => return make_unop("!", Sugg::BinOp(op, lhs, rhs)),
+ };
+ Sugg::BinOp(to_op, lhs, rhs)
+ } else {
+ make_unop("!", self)
+ }
+ }
+}
+
+/// Helper type to display either `foo` or `(foo)`.
+struct ParenHelper<T> {
+ /// `true` if parentheses are needed.
+ paren: bool,
+ /// The main thing to display.
+ wrapped: T,
+}
+
+impl<T> ParenHelper<T> {
+ /// Builds a `ParenHelper`.
+ fn new(paren: bool, wrapped: T) -> Self {
+ Self { paren, wrapped }
+ }
+}
+
+impl<T: Display> Display for ParenHelper<T> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ if self.paren {
+ write!(f, "({})", self.wrapped)
+ } else {
+ self.wrapped.fmt(f)
+ }
+ }
+}
+
+/// Builds the string for `<op><expr>` adding parenthesis when necessary.
+///
+/// For convenience, the operator is taken as a string because all unary
+/// operators have the same
+/// precedence.
+pub fn make_unop(op: &str, expr: Sugg<'_>) -> Sugg<'static> {
+ Sugg::MaybeParen(format!("{op}{}", expr.maybe_par()).into())
+}
+
+/// Builds the string for `<lhs> <op> <rhs>` adding parenthesis when necessary.
+///
+/// Precedence of shift operator relative to other arithmetic operation is
+/// often confusing so
+/// parenthesis will always be added for a mix of these.
+pub fn make_assoc(op: AssocOp, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ /// Returns `true` if the operator is a shift operator `<<` or `>>`.
+ fn is_shift(op: AssocOp) -> bool {
+ matches!(op, AssocOp::ShiftLeft | AssocOp::ShiftRight)
+ }
+
+ /// Returns `true` if the operator is an arithmetic operator
+ /// (i.e., `+`, `-`, `*`, `/`, `%`).
+ fn is_arith(op: AssocOp) -> bool {
+ matches!(
+ op,
+ AssocOp::Add | AssocOp::Subtract | AssocOp::Multiply | AssocOp::Divide | AssocOp::Modulus
+ )
+ }
+
+ /// Returns `true` if the operator `op` needs parenthesis with the operator
+ /// `other` in the direction `dir`.
+ fn needs_paren(op: AssocOp, other: AssocOp, dir: Associativity) -> bool {
+ other.precedence() < op.precedence()
+ || (other.precedence() == op.precedence()
+ && ((op != other && associativity(op) != dir)
+ || (op == other && associativity(op) != Associativity::Both)))
+ || is_shift(op) && is_arith(other)
+ || is_shift(other) && is_arith(op)
+ }
+
+ let lhs_paren = if let Sugg::BinOp(lop, _, _) = *lhs {
+ needs_paren(op, lop, Associativity::Left)
+ } else {
+ false
+ };
+
+ let rhs_paren = if let Sugg::BinOp(rop, _, _) = *rhs {
+ needs_paren(op, rop, Associativity::Right)
+ } else {
+ false
+ };
+
+ let lhs = ParenHelper::new(lhs_paren, lhs).to_string();
+ let rhs = ParenHelper::new(rhs_paren, rhs).to_string();
+ Sugg::BinOp(op, lhs.into(), rhs.into())
+}
+
+/// Convenience wrapper around `make_assoc` and `AssocOp::from_ast_binop`.
+pub fn make_binop(op: ast::BinOpKind, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_assoc(AssocOp::from_ast_binop(op), lhs, rhs)
+}
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+/// Operator associativity.
+enum Associativity {
+ /// The operator is both left-associative and right-associative.
+ Both,
+ /// The operator is left-associative.
+ Left,
+ /// The operator is not associative.
+ None,
+ /// The operator is right-associative.
+ Right,
+}
+
+/// Returns the associativity/fixity of an operator. The difference with
+/// `AssocOp::fixity` is that an operator can be both left and right associative
+/// (such as `+`: `a + b + c == (a + b) + c == a + (b + c)`.
+///
+/// Chained `as` and explicit `:` type coercion never need inner parenthesis so
+/// they are considered
+/// associative.
+#[must_use]
+fn associativity(op: AssocOp) -> Associativity {
+ use rustc_ast::util::parser::AssocOp::{
+ Add, As, Assign, AssignOp, BitAnd, BitOr, BitXor, Colon, Divide, DotDot, DotDotEq, Equal, Greater,
+ GreaterEqual, LAnd, LOr, Less, LessEqual, Modulus, Multiply, NotEqual, ShiftLeft, ShiftRight, Subtract,
+ };
+
+ match op {
+ Assign | AssignOp(_) => Associativity::Right,
+ Add | BitAnd | BitOr | BitXor | LAnd | LOr | Multiply | As | Colon => Associativity::Both,
+ Divide | Equal | Greater | GreaterEqual | Less | LessEqual | Modulus | NotEqual | ShiftLeft | ShiftRight
+ | Subtract => Associativity::Left,
+ DotDot | DotDotEq => Associativity::None,
+ }
+}
+
+/// Converts a `hir::BinOp` to the corresponding assigning binary operator.
+fn hirbinop2assignop(op: hir::BinOp) -> AssocOp {
+ use rustc_ast::token::BinOpToken::{And, Caret, Minus, Or, Percent, Plus, Shl, Shr, Slash, Star};
+
+ AssocOp::AssignOp(match op.node {
+ hir::BinOpKind::Add => Plus,
+ hir::BinOpKind::BitAnd => And,
+ hir::BinOpKind::BitOr => Or,
+ hir::BinOpKind::BitXor => Caret,
+ hir::BinOpKind::Div => Slash,
+ hir::BinOpKind::Mul => Star,
+ hir::BinOpKind::Rem => Percent,
+ hir::BinOpKind::Shl => Shl,
+ hir::BinOpKind::Shr => Shr,
+ hir::BinOpKind::Sub => Minus,
+
+ hir::BinOpKind::And
+ | hir::BinOpKind::Eq
+ | hir::BinOpKind::Ge
+ | hir::BinOpKind::Gt
+ | hir::BinOpKind::Le
+ | hir::BinOpKind::Lt
+ | hir::BinOpKind::Ne
+ | hir::BinOpKind::Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Converts an `ast::BinOp` to the corresponding assigning binary operator.
+fn astbinop2assignop(op: ast::BinOp) -> AssocOp {
+ use rustc_ast::ast::BinOpKind::{
+ Add, And, BitAnd, BitOr, BitXor, Div, Eq, Ge, Gt, Le, Lt, Mul, Ne, Or, Rem, Shl, Shr, Sub,
+ };
+ use rustc_ast::token::BinOpToken;
+
+ AssocOp::AssignOp(match op.node {
+ Add => BinOpToken::Plus,
+ BitAnd => BinOpToken::And,
+ BitOr => BinOpToken::Or,
+ BitXor => BinOpToken::Caret,
+ Div => BinOpToken::Slash,
+ Mul => BinOpToken::Star,
+ Rem => BinOpToken::Percent,
+ Shl => BinOpToken::Shl,
+ Shr => BinOpToken::Shr,
+ Sub => BinOpToken::Minus,
+ And | Eq | Ge | Gt | Le | Lt | Ne | Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Returns the indentation before `span` if there are nothing but `[ \t]`
+/// before it on its line.
+fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> {
+ let lo = cx.sess().source_map().lookup_char_pos(span.lo());
+ lo.file
+ .get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */)
+ .and_then(|line| {
+ if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') {
+ // We can mix char and byte positions here because we only consider `[ \t]`.
+ if lo.col == CharPos(pos) {
+ Some(line[..pos].into())
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ })
+}
+
+/// Convenience extension trait for `Diagnostic`.
+pub trait DiagnosticExt<T: LintContext> {
+ /// Suggests to add an attribute to an item.
+ ///
+ /// Correctly handles indentation of the attribute and item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_item_with_attr(cx, item, "#[derive(Default)]");
+ /// ```
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ );
+
+ /// Suggest to add an item before another.
+ ///
+ /// The item should not be indented (except for inner indentation).
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_prepend_item(cx, item,
+ /// "fn foo() {
+ /// bar();
+ /// }");
+ /// ```
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability);
+
+ /// Suggest to completely remove an item.
+ ///
+ /// This will remove an item and all following whitespace until the next non-whitespace
+ /// character. This should work correctly if item is on the same indentation level as the
+ /// following item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_remove_item(cx, item, "remove this")
+ /// ```
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability);
+}
+
+impl<T: LintContext> DiagnosticExt<T> for rustc_errors::Diagnostic {
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ ) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ self.span_suggestion(span, msg, format!("{attr}\n{indent}"), applicability);
+ }
+ }
+
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ let mut first = true;
+ let new_item = new_item
+ .lines()
+ .map(|l| {
+ if first {
+ first = false;
+ format!("{l}\n")
+ } else {
+ format!("{indent}{l}\n")
+ }
+ })
+ .collect::<String>();
+
+ self.span_suggestion(span, msg, format!("{new_item}\n{indent}"), applicability);
+ }
+ }
+
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability) {
+ let mut remove_span = item;
+ let fmpos = cx.sess().source_map().lookup_byte_offset(remove_span.hi());
+
+ if let Some(ref src) = fmpos.sf.src {
+ let non_whitespace_offset = src[fmpos.pos.to_usize()..].find(|c| c != ' ' && c != '\t' && c != '\n');
+
+ if let Some(non_whitespace_offset) = non_whitespace_offset {
+ remove_span = remove_span
+ .with_hi(remove_span.hi() + BytePos(non_whitespace_offset.try_into().expect("offset too large")));
+ }
+ }
+
+ self.span_suggestion(remove_span, msg, "", applicability);
+ }
+}
+
+/// Suggestion results for handling closure
+/// args dereferencing and borrowing
+pub struct DerefClosure {
+ /// confidence on the built suggestion
+ pub applicability: Applicability,
+ /// gradually built suggestion
+ pub suggestion: String,
+}
+
+/// Build suggestion gradually by handling closure arg specific usages,
+/// such as explicit deref and borrowing cases.
+/// Returns `None` if no such use cases have been triggered in closure body
+///
+/// note: this only works on single line immutable closures with exactly one input parameter.
+pub fn deref_closure_args<'tcx>(cx: &LateContext<'_>, closure: &'tcx hir::Expr<'_>) -> Option<DerefClosure> {
+ if let hir::ExprKind::Closure(&Closure { fn_decl, body, .. }) = closure.kind {
+ let closure_body = cx.tcx.hir().body(body);
+ // is closure arg a type annotated double reference (i.e.: `|x: &&i32| ...`)
+ // a type annotation is present if param `kind` is different from `TyKind::Infer`
+ let closure_arg_is_type_annotated_double_ref = if let TyKind::Rptr(_, MutTy { ty, .. }) = fn_decl.inputs[0].kind
+ {
+ matches!(ty.kind, TyKind::Rptr(_, MutTy { .. }))
+ } else {
+ false
+ };
+
+ let mut visitor = DerefDelegate {
+ cx,
+ closure_span: closure.span,
+ closure_arg_is_type_annotated_double_ref,
+ next_pos: closure.span.lo(),
+ suggestion_start: String::new(),
+ applicability: Applicability::MachineApplicable,
+ };
+
+ let fn_def_id = cx.tcx.hir().local_def_id(closure.hir_id);
+ let infcx = cx.tcx.infer_ctxt().build();
+ ExprUseVisitor::new(&mut visitor, &infcx, fn_def_id, cx.param_env, cx.typeck_results())
+ .consume_body(closure_body);
+
+ if !visitor.suggestion_start.is_empty() {
+ return Some(DerefClosure {
+ applicability: visitor.applicability,
+ suggestion: visitor.finish(),
+ });
+ }
+ }
+ None
+}
+
+/// Visitor struct used for tracking down
+/// dereferencing and borrowing of closure's args
+struct DerefDelegate<'a, 'tcx> {
+ /// The late context of the lint
+ cx: &'a LateContext<'tcx>,
+ /// The span of the input closure to adapt
+ closure_span: Span,
+ /// Indicates if the arg of the closure is a type annotated double reference
+ closure_arg_is_type_annotated_double_ref: bool,
+ /// last position of the span to gradually build the suggestion
+ next_pos: BytePos,
+ /// starting part of the gradually built suggestion
+ suggestion_start: String,
+ /// confidence on the built suggestion
+ applicability: Applicability,
+}
+
+impl<'tcx> DerefDelegate<'_, 'tcx> {
+ /// build final suggestion:
+ /// - create the ending part of suggestion
+ /// - concatenate starting and ending parts
+ /// - potentially remove needless borrowing
+ pub fn finish(&mut self) -> String {
+ let end_span = Span::new(self.next_pos, self.closure_span.hi(), self.closure_span.ctxt(), None);
+ let end_snip = snippet_with_applicability(self.cx, end_span, "..", &mut self.applicability);
+ let sugg = format!("{}{end_snip}", self.suggestion_start);
+ if self.closure_arg_is_type_annotated_double_ref {
+ sugg.replacen('&', "", 1)
+ } else {
+ sugg
+ }
+ }
+
+ /// indicates whether the function from `parent_expr` takes its args by double reference
+ fn func_takes_arg_by_double_ref(&self, parent_expr: &'tcx hir::Expr<'_>, cmt_hir_id: HirId) -> bool {
+ let ty = match parent_expr.kind {
+ ExprKind::MethodCall(_, receiver, call_args, _) => {
+ if let Some(sig) = self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(parent_expr.hir_id)
+ .map(|did| self.cx.tcx.fn_sig(did).skip_binder())
+ {
+ std::iter::once(receiver)
+ .chain(call_args.iter())
+ .position(|arg| arg.hir_id == cmt_hir_id)
+ .map(|i| sig.inputs()[i])
+ } else {
+ return false;
+ }
+ },
+ ExprKind::Call(func, call_args) => {
+ if let Some(sig) = expr_sig(self.cx, func) {
+ call_args
+ .iter()
+ .position(|arg| arg.hir_id == cmt_hir_id)
+ .and_then(|i| sig.input(i))
+ .map(ty::Binder::skip_binder)
+ } else {
+ return false;
+ }
+ },
+ _ => return false,
+ };
+
+ ty.map_or(false, |ty| matches!(ty.kind(), ty::Ref(_, inner, _) if inner.is_ref()))
+ }
+}
+
+impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
+ fn consume(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
+ fn borrow(&mut self, cmt: &PlaceWithHirId<'tcx>, _: HirId, _: ty::BorrowKind) {
+ if let PlaceBase::Local(id) = cmt.place.base {
+ let map = self.cx.tcx.hir();
+ let span = map.span(cmt.hir_id);
+ let start_span = Span::new(self.next_pos, span.lo(), span.ctxt(), None);
+ let mut start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+
+ // identifier referring to the variable currently triggered (i.e.: `fp`)
+ let ident_str = map.name(id).to_string();
+ // full identifier that includes projection (i.e.: `fp.field`)
+ let ident_str_with_proj = snippet(self.cx, span, "..").to_string();
+
+ if cmt.place.projections.is_empty() {
+ // handle item without any projection, that needs an explicit borrowing
+ // i.e.: suggest `&x` instead of `x`
+ let _ = write!(self.suggestion_start, "{start_snip}&{ident_str}");
+ } else {
+ // cases where a parent `Call` or `MethodCall` is using the item
+ // i.e.: suggest `.contains(&x)` for `.find(|x| [1, 2, 3].contains(x)).is_none()`
+ //
+ // Note about method calls:
+ // - compiler automatically dereference references if the target type is a reference (works also for
+ // function call)
+ // - `self` arguments in the case of `x.is_something()` are also automatically (de)referenced, and
+ // no projection should be suggested
+ if let Some(parent_expr) = get_parent_expr_for_hir(self.cx, cmt.hir_id) {
+ match &parent_expr.kind {
+ // given expression is the self argument and will be handled completely by the compiler
+ // i.e.: `|x| x.is_something()`
+ ExprKind::MethodCall(_, self_expr, ..) if self_expr.hir_id == cmt.hir_id => {
+ let _ = write!(self.suggestion_start, "{start_snip}{ident_str_with_proj}");
+ self.next_pos = span.hi();
+ return;
+ },
+ // item is used in a call
+ // i.e.: `Call`: `|x| please(x)` or `MethodCall`: `|x| [1, 2, 3].contains(x)`
+ ExprKind::Call(_, [call_args @ ..]) | ExprKind::MethodCall(_, _, [call_args @ ..], _) => {
+ let expr = self.cx.tcx.hir().expect_expr(cmt.hir_id);
+ let arg_ty_kind = self.cx.typeck_results().expr_ty(expr).kind();
+
+ if matches!(arg_ty_kind, ty::Ref(_, _, Mutability::Not)) {
+ // suggest ampersand if call function is taking args by double reference
+ let takes_arg_by_double_ref =
+ self.func_takes_arg_by_double_ref(parent_expr, cmt.hir_id);
+
+ // compiler will automatically dereference field or index projection, so no need
+ // to suggest ampersand, but full identifier that includes projection is required
+ let has_field_or_index_projection =
+ cmt.place.projections.iter().any(|proj| {
+ matches!(proj.kind, ProjectionKind::Field(..) | ProjectionKind::Index)
+ });
+
+ // no need to bind again if the function doesn't take arg by double ref
+ // and if the item is already a double ref
+ let ident_sugg = if !call_args.is_empty()
+ && !takes_arg_by_double_ref
+ && (self.closure_arg_is_type_annotated_double_ref || has_field_or_index_projection)
+ {
+ let ident = if has_field_or_index_projection {
+ ident_str_with_proj
+ } else {
+ ident_str
+ };
+ format!("{start_snip}{ident}")
+ } else {
+ format!("{start_snip}&{ident_str}")
+ };
+ self.suggestion_start.push_str(&ident_sugg);
+ self.next_pos = span.hi();
+ return;
+ }
+
+ self.applicability = Applicability::Unspecified;
+ },
+ _ => (),
+ }
+ }
+
+ let mut replacement_str = ident_str;
+ let mut projections_handled = false;
+ cmt.place.projections.iter().enumerate().for_each(|(i, proj)| {
+ match proj.kind {
+ // Field projection like `|v| v.foo`
+ // no adjustment needed here, as field projections are handled by the compiler
+ ProjectionKind::Field(..) => match cmt.place.ty_before_projection(i).kind() {
+ ty::Adt(..) | ty::Tuple(_) => {
+ replacement_str = ident_str_with_proj.clone();
+ projections_handled = true;
+ },
+ _ => (),
+ },
+ // Index projection like `|x| foo[x]`
+ // the index is dropped so we can't get it to build the suggestion,
+ // so the span is set-up again to get more code, using `span.hi()` (i.e.: `foo[x]`)
+ // instead of `span.lo()` (i.e.: `foo`)
+ ProjectionKind::Index => {
+ let start_span = Span::new(self.next_pos, span.hi(), span.ctxt(), None);
+ start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+ replacement_str.clear();
+ projections_handled = true;
+ },
+ // note: unable to trigger `Subslice` kind in tests
+ ProjectionKind::Subslice => (),
+ ProjectionKind::Deref => {
+ // Explicit derefs are typically handled later on, but
+ // some items do not need explicit deref, such as array accesses,
+ // so we mark them as already processed
+ // i.e.: don't suggest `*sub[1..4].len()` for `|sub| sub[1..4].len() == 3`
+ if let ty::Ref(_, inner, _) = cmt.place.ty_before_projection(i).kind() {
+ if matches!(inner.kind(), ty::Ref(_, innermost, _) if innermost.is_array()) {
+ projections_handled = true;
+ }
+ }
+ },
+ }
+ });
+
+ // handle `ProjectionKind::Deref` by removing one explicit deref
+ // if no special case was detected (i.e.: suggest `*x` instead of `**x`)
+ if !projections_handled {
+ let last_deref = cmt
+ .place
+ .projections
+ .iter()
+ .rposition(|proj| proj.kind == ProjectionKind::Deref);
+
+ if let Some(pos) = last_deref {
+ let mut projections = cmt.place.projections.clone();
+ projections.truncate(pos);
+
+ for item in projections {
+ if item.kind == ProjectionKind::Deref {
+ replacement_str = format!("*{replacement_str}");
+ }
+ }
+ }
+ }
+
+ let _ = write!(self.suggestion_start, "{start_snip}{replacement_str}");
+ }
+ self.next_pos = span.hi();
+ }
+ }
+
+ fn mutate(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
++ fn fake_read(&mut self, _: &PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
+}
+
+#[cfg(test)]
+mod test {
+ use super::Sugg;
+
+ use rustc_ast::util::parser::AssocOp;
+ use std::borrow::Cow;
+
+ const SUGGESTION: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("function_call()"));
+
+ #[test]
+ fn make_return_transform_sugg_into_a_return_call() {
+ assert_eq!("return function_call()", SUGGESTION.make_return().to_string());
+ }
+
+ #[test]
+ fn blockify_transforms_sugg_into_a_block() {
+ assert_eq!("{ function_call() }", SUGGESTION.blockify().to_string());
+ }
+
+ #[test]
+ fn binop_maybe_par() {
+ let sugg = Sugg::BinOp(AssocOp::Add, "1".into(), "1".into());
+ assert_eq!("(1 + 1)", sugg.maybe_par().to_string());
+
+ let sugg = Sugg::BinOp(AssocOp::Add, "(1 + 1)".into(), "(1 + 1)".into());
+ assert_eq!("((1 + 1) + (1 + 1))", sugg.maybe_par().to_string());
+ }
+ #[test]
+ fn not_op() {
+ use AssocOp::{Add, Equal, Greater, GreaterEqual, LAnd, LOr, Less, LessEqual, NotEqual};
+
+ fn test_not(op: AssocOp, correct: &str) {
+ let sugg = Sugg::BinOp(op, "x".into(), "y".into());
+ assert_eq!((!sugg).to_string(), correct);
+ }
+
+ // Invert the comparison operator.
+ test_not(Equal, "x != y");
+ test_not(NotEqual, "x == y");
+ test_not(Less, "x >= y");
+ test_not(LessEqual, "x > y");
+ test_not(Greater, "x <= y");
+ test_not(GreaterEqual, "x < y");
+
+ // Other operators are inverted like !(..).
+ test_not(Add, "!(x + y)");
+ test_not(LAnd, "!(x && y)");
+ test_not(LOr, "!(x || y)");
+ }
+}
--- /dev/null
- .map(|s| &**s)
- .unwrap_or("lintcheck/lintcheck_crates.toml")
+use clap::{Arg, ArgAction, ArgMatches, Command};
+use std::env;
+use std::path::PathBuf;
+
+fn get_clap_config() -> ArgMatches {
+ Command::new("lintcheck")
+ .about("run clippy on a set of crates and check output")
+ .args([
+ Arg::new("only")
+ .action(ArgAction::Set)
+ .value_name("CRATE")
+ .long("only")
+ .help("Only process a single crate of the list"),
+ Arg::new("crates-toml")
+ .action(ArgAction::Set)
+ .value_name("CRATES-SOURCES-TOML-PATH")
+ .long("crates-toml")
+ .help("Set the path for a crates.toml where lintcheck should read the sources from"),
+ Arg::new("threads")
+ .action(ArgAction::Set)
+ .value_name("N")
+ .value_parser(clap::value_parser!(usize))
+ .short('j')
+ .long("jobs")
+ .help("Number of threads to use, 0 automatic choice"),
+ Arg::new("fix")
+ .long("fix")
+ .help("Runs cargo clippy --fix and checks if all suggestions apply"),
+ Arg::new("filter")
+ .long("filter")
+ .action(ArgAction::Append)
+ .value_name("clippy_lint_name")
+ .help("Apply a filter to only collect specified lints, this also overrides `allow` attributes"),
+ Arg::new("markdown")
+ .long("markdown")
+ .help("Change the reports table to use markdown links"),
+ Arg::new("recursive")
+ .long("--recursive")
+ .help("Run clippy on the dependencies of crates specified in crates-toml")
+ .conflicts_with("threads")
+ .conflicts_with("fix"),
+ ])
+ .get_matches()
+}
+
+#[derive(Debug, Clone)]
+pub(crate) struct LintcheckConfig {
+ /// max number of jobs to spawn (default 1)
+ pub max_jobs: usize,
+ /// we read the sources to check from here
+ pub sources_toml_path: PathBuf,
+ /// we save the clippy lint results here
+ pub lintcheck_results_path: PathBuf,
+ /// Check only a specified package
+ pub only: Option<String>,
+ /// whether to just run --fix and not collect all the warnings
+ pub fix: bool,
+ /// A list of lints that this lintcheck run should focus on
+ pub lint_filter: Vec<String>,
+ /// Indicate if the output should support markdown syntax
+ pub markdown: bool,
+ /// Run clippy on the dependencies of crates
+ pub recursive: bool,
+}
+
+impl LintcheckConfig {
+ pub fn new() -> Self {
+ let clap_config = get_clap_config();
+
+ // first, check if we got anything passed via the LINTCHECK_TOML env var,
+ // if not, ask clap if we got any value for --crates-toml <foo>
+ // if not, use the default "lintcheck/lintcheck_crates.toml"
+ let sources_toml = env::var("LINTCHECK_TOML").unwrap_or_else(|_| {
+ clap_config
+ .get_one::<String>("crates-toml")
- (rayon::current_num_threads() / 2) as usize
++ .map_or("lintcheck/lintcheck_crates.toml", |s| &**s)
+ .into()
+ });
+
+ let markdown = clap_config.contains_id("markdown");
+ let sources_toml_path = PathBuf::from(sources_toml);
+
+ // for the path where we save the lint results, get the filename without extension (so for
+ // wasd.toml, use "wasd"...)
+ let filename: PathBuf = sources_toml_path.file_stem().unwrap().into();
+ let lintcheck_results_path = PathBuf::from(format!(
+ "lintcheck-logs/{}_logs.{}",
+ filename.display(),
+ if markdown { "md" } else { "txt" }
+ ));
+
+ // look at the --threads arg, if 0 is passed, ask rayon rayon how many threads it would spawn and
+ // use half of that for the physical core count
+ // by default use a single thread
+ let max_jobs = match clap_config.get_one::<usize>("threads") {
+ Some(&0) => {
+ // automatic choice
+ // Rayon seems to return thread count so half that for core count
++ rayon::current_num_threads() / 2
+ },
+ Some(&threads) => threads,
+ // no -j passed, use a single thread
+ None => 1,
+ };
+
+ let lint_filter: Vec<String> = clap_config
+ .get_many::<String>("filter")
+ .map(|iter| {
+ iter.map(|lint_name| {
+ let mut filter = lint_name.replace('_', "-");
+ if !filter.starts_with("clippy::") {
+ filter.insert_str(0, "clippy::");
+ }
+ filter
+ })
+ .collect()
+ })
+ .unwrap_or_default();
+
+ LintcheckConfig {
+ max_jobs,
+ sources_toml_path,
+ lintcheck_results_path,
+ only: clap_config.get_one::<String>("only").map(String::from),
+ fix: clap_config.contains_id("fix"),
+ lint_filter,
+ markdown,
+ recursive: clap_config.contains_id("recursive"),
+ }
+ }
+}
--- /dev/null
- /// 1. Sends [DriverInfo] to the [crate::recursive::LintcheckServer] running on `addr`
+use crate::recursive::{deserialize_line, serialize_line, DriverInfo};
+
+use std::io::{self, BufReader, Write};
+use std::net::TcpStream;
+use std::process::{self, Command, Stdio};
+use std::{env, mem};
+
++/// 1. Sends [`DriverInfo`] to the [`crate::recursive::LintcheckServer`] running on `addr`
+/// 2. Receives [bool] from the server, if `false` returns `None`
+/// 3. Otherwise sends the stderr of running `clippy-driver` to the server
+fn run_clippy(addr: &str) -> Option<i32> {
+ let driver_info = DriverInfo {
+ package_name: env::var("CARGO_PKG_NAME").ok()?,
+ crate_name: env::var("CARGO_CRATE_NAME").ok()?,
+ version: env::var("CARGO_PKG_VERSION").ok()?,
+ };
+
+ let mut stream = BufReader::new(TcpStream::connect(addr).unwrap());
+
+ serialize_line(&driver_info, stream.get_mut());
+
+ let should_run = deserialize_line::<bool, _>(&mut stream);
+ if !should_run {
+ return None;
+ }
+
+ // Remove --cap-lints allow so that clippy runs and lints are emitted
+ let mut include_next = true;
+ let args = env::args().skip(1).filter(|arg| match arg.as_str() {
+ "--cap-lints=allow" => false,
+ "--cap-lints" => {
+ include_next = false;
+ false
+ },
+ _ => mem::replace(&mut include_next, true),
+ });
+
+ let output = Command::new(env::var("CLIPPY_DRIVER").expect("missing env CLIPPY_DRIVER"))
+ .args(args)
+ .stdout(Stdio::inherit())
+ .output()
+ .expect("failed to run clippy-driver");
+
+ stream
+ .get_mut()
+ .write_all(&output.stderr)
+ .unwrap_or_else(|e| panic!("{e:?} in {driver_info:?}"));
+
+ match output.status.code() {
+ Some(0) => Some(0),
+ code => {
+ io::stderr().write_all(&output.stderr).unwrap();
+ Some(code.expect("killed by signal"))
+ },
+ }
+}
+
+pub fn drive(addr: &str) {
+ process::exit(run_clippy(addr).unwrap_or_else(|| {
+ Command::new("rustc")
+ .args(env::args_os().skip(2))
+ .status()
+ .unwrap()
+ .code()
+ .unwrap()
+ }))
+}
--- /dev/null
- let file = match Path::new(&span.file_name).strip_prefix(env!("CARGO_HOME")) {
- Ok(stripped) => format!("$CARGO_HOME/{}", stripped.display()),
- Err(_) => format!(
+// Run clippy on a fixed set of crates and collect the warnings.
+// This helps observing the impact clippy changes have on a set of real-world code (and not just our
+// testsuite).
+//
+// When a new lint is introduced, we can search the results for new warnings and check for false
+// positives.
+
+#![allow(clippy::collapsible_else_if)]
+
+mod config;
+mod driver;
+mod recursive;
+
+use crate::config::LintcheckConfig;
+use crate::recursive::LintcheckServer;
+
+use std::collections::{HashMap, HashSet};
+use std::env;
+use std::env::consts::EXE_SUFFIX;
+use std::fmt::Write as _;
+use std::fs;
+use std::io::ErrorKind;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::thread;
+use std::time::Duration;
+
+use cargo_metadata::diagnostic::{Diagnostic, DiagnosticLevel};
+use cargo_metadata::Message;
+use rayon::prelude::*;
+use serde::{Deserialize, Serialize};
+use walkdir::{DirEntry, WalkDir};
+
+const LINTCHECK_DOWNLOADS: &str = "target/lintcheck/downloads";
+const LINTCHECK_SOURCES: &str = "target/lintcheck/sources";
+
+/// List of sources to check, loaded from a .toml file
+#[derive(Debug, Serialize, Deserialize)]
+struct SourceList {
+ crates: HashMap<String, TomlCrate>,
+ #[serde(default)]
+ recursive: RecursiveOptions,
+}
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+struct RecursiveOptions {
+ ignore: HashSet<String>,
+}
+
+/// A crate source stored inside the .toml
+/// will be translated into on one of the `CrateSource` variants
+#[derive(Debug, Serialize, Deserialize)]
+struct TomlCrate {
+ name: String,
+ versions: Option<Vec<String>>,
+ git_url: Option<String>,
+ git_hash: Option<String>,
+ path: Option<String>,
+ options: Option<Vec<String>>,
+}
+
+/// Represents an archive we download from crates.io, or a git repo, or a local repo/folder
+/// Once processed (downloaded/extracted/cloned/copied...), this will be translated into a `Crate`
+#[derive(Debug, Serialize, Deserialize, Eq, Hash, PartialEq, Ord, PartialOrd)]
+enum CrateSource {
+ CratesIo {
+ name: String,
+ version: String,
+ options: Option<Vec<String>>,
+ },
+ Git {
+ name: String,
+ url: String,
+ commit: String,
+ options: Option<Vec<String>>,
+ },
+ Path {
+ name: String,
+ path: PathBuf,
+ options: Option<Vec<String>>,
+ },
+}
+
+/// Represents the actual source code of a crate that we ran "cargo clippy" on
+#[derive(Debug)]
+struct Crate {
+ version: String,
+ name: String,
+ // path to the extracted sources that clippy can check
+ path: PathBuf,
+ options: Option<Vec<String>>,
+}
+
+/// A single warning that clippy issued while checking a `Crate`
+#[derive(Debug)]
+struct ClippyWarning {
+ crate_name: String,
+ file: String,
+ line: usize,
+ column: usize,
+ lint_type: String,
+ message: String,
+ is_ice: bool,
+}
+
+#[allow(unused)]
+impl ClippyWarning {
+ fn new(diag: Diagnostic, crate_name: &str, crate_version: &str) -> Option<Self> {
+ let lint_type = diag.code?.code;
+ if !(lint_type.contains("clippy") || diag.message.contains("clippy"))
+ || diag.message.contains("could not read cargo metadata")
+ {
+ return None;
+ }
+
+ let span = diag.spans.into_iter().find(|span| span.is_primary)?;
+
- ),
++ let file = if let Ok(stripped) = Path::new(&span.file_name).strip_prefix(env!("CARGO_HOME")) {
++ format!("$CARGO_HOME/{}", stripped.display())
++ } else {
++ format!(
+ "target/lintcheck/sources/{}-{}/{}",
+ crate_name, crate_version, span.file_name
- let _ = write!(output, "[`{}`]({}#L{})", file_with_pos, file, self.line);
++ )
+ };
+
+ Some(Self {
+ crate_name: crate_name.to_owned(),
+ file,
+ line: span.line_start,
+ column: span.column_start,
+ lint_type,
+ message: diag.message,
+ is_ice: diag.level == DiagnosticLevel::Ice,
+ })
+ }
+
+ fn to_output(&self, markdown: bool) -> String {
+ let file_with_pos = format!("{}:{}:{}", &self.file, &self.line, &self.column);
+ if markdown {
+ let mut file = self.file.clone();
+ if !file.starts_with('$') {
+ file.insert_str(0, "../");
+ }
+
+ let mut output = String::from("| ");
- format!("{} {} \"{}\"\n", file_with_pos, self.lint_type, self.message)
++ let _ = write!(output, "[`{file_with_pos}`]({file}#L{})", self.line);
+ let _ = write!(output, r#" | `{:<50}` | "{}" |"#, self.lint_type, self.message);
+ output.push('\n');
+ output
+ } else {
- Err(ureq::Error::Transport(e)) => eprintln!("Error: {}", e),
++ format!("{file_with_pos} {} \"{}\"\n", self.lint_type, self.message)
+ }
+ }
+}
+
++#[allow(clippy::result_large_err)]
+fn get(path: &str) -> Result<ureq::Response, ureq::Error> {
+ const MAX_RETRIES: u8 = 4;
+ let mut retries = 0;
+ loop {
+ match ureq::get(path).call() {
+ Ok(res) => return Ok(res),
+ Err(e) if retries >= MAX_RETRIES => return Err(e),
- eprintln!("retrying in {} seconds...", retries);
- thread::sleep(Duration::from_secs(retries as u64));
++ Err(ureq::Error::Transport(e)) => eprintln!("Error: {e}"),
+ Err(e) => return Err(e),
+ }
- let url = format!("https://crates.io/api/v1/crates/{}/{}/download", name, version);
- println!("Downloading and extracting {} {} from {}", name, version, url);
++ eprintln!("retrying in {retries} seconds...");
++ thread::sleep(Duration::from_secs(u64::from(retries)));
+ retries += 1;
+ }
+}
+
+impl CrateSource {
+ /// Makes the sources available on the disk for clippy to check.
+ /// Clones a git repo and checks out the specified commit or downloads a crate from crates.io or
+ /// copies a local folder
+ fn download_and_extract(&self) -> Crate {
+ match self {
+ CrateSource::CratesIo { name, version, options } => {
+ let extract_dir = PathBuf::from(LINTCHECK_SOURCES);
+ let krate_download_dir = PathBuf::from(LINTCHECK_DOWNLOADS);
+
+ // url to download the crate from crates.io
- let krate_file_path = krate_download_dir.join(format!("{}-{}.crate.tar.gz", name, version));
++ let url = format!("https://crates.io/api/v1/crates/{name}/{version}/download");
++ println!("Downloading and extracting {name} {version} from {url}");
+ create_dirs(&krate_download_dir, &extract_dir);
+
- path: extract_dir.join(format!("{}-{}/", name, version)),
++ let krate_file_path = krate_download_dir.join(format!("{name}-{version}.crate.tar.gz"));
+ // don't download/extract if we already have done so
+ if !krate_file_path.is_file() {
+ // create a file path to download and write the crate data into
+ let mut krate_dest = std::fs::File::create(&krate_file_path).unwrap();
+ let mut krate_req = get(&url).unwrap().into_reader();
+ // copy the crate into the file
+ std::io::copy(&mut krate_req, &mut krate_dest).unwrap();
+
+ // unzip the tarball
+ let ungz_tar = flate2::read::GzDecoder::new(std::fs::File::open(&krate_file_path).unwrap());
+ // extract the tar archive
+ let mut archive = tar::Archive::new(ungz_tar);
+ archive.unpack(&extract_dir).expect("Failed to extract!");
+ }
+ // crate is extracted, return a new Krate object which contains the path to the extracted
+ // sources that clippy can check
+ Crate {
+ version: version.clone(),
+ name: name.clone(),
- repo_path.push(format!("{}-git", name));
++ path: extract_dir.join(format!("{name}-{version}/")),
+ options: options.clone(),
+ }
+ },
+ CrateSource::Git {
+ name,
+ url,
+ commit,
+ options,
+ } => {
+ let repo_path = {
+ let mut repo_path = PathBuf::from(LINTCHECK_SOURCES);
+ // add a -git suffix in case we have the same crate from crates.io and a git repo
- println!("Cloning {} and checking out {}", url, commit);
++ repo_path.push(format!("{name}-git"));
+ repo_path
+ };
+ // clone the repo if we have not done so
+ if !repo_path.is_dir() {
- eprintln!("Failed to clone {} into {}", url, repo_path.display())
++ println!("Cloning {url} and checking out {commit}");
+ if !Command::new("git")
+ .arg("clone")
+ .arg(url)
+ .arg(&repo_path)
+ .status()
+ .expect("Failed to clone git repo!")
+ .success()
+ {
- eprintln!("Failed to checkout {} of repo at {}", commit, repo_path.display())
++ eprintln!("Failed to clone {url} into {}", repo_path.display());
+ }
+ }
+ // check out the commit/branch/whatever
+ if !Command::new("git")
+ .args(["-c", "advice.detachedHead=false"])
+ .arg("checkout")
+ .arg(commit)
+ .current_dir(&repo_path)
+ .status()
+ .expect("Failed to check out commit")
+ .success()
+ {
- println!("Deleting existing directory at {:?}", dest_crate_root);
++ eprintln!("Failed to checkout {commit} of repo at {}", repo_path.display());
+ }
+
+ Crate {
+ version: commit.clone(),
+ name: name.clone(),
+ path: repo_path,
+ options: options.clone(),
+ }
+ },
+ CrateSource::Path { name, path, options } => {
++ fn is_cache_dir(entry: &DirEntry) -> bool {
++ std::fs::read(entry.path().join("CACHEDIR.TAG"))
++ .map(|x| x.starts_with(b"Signature: 8a477f597d28d172789f06886806bc55"))
++ .unwrap_or(false)
++ }
++
+ // copy path into the dest_crate_root but skip directories that contain a CACHEDIR.TAG file.
+ // The target/ directory contains a CACHEDIR.TAG file so it is the most commonly skipped directory
+ // as a result of this filter.
+ let dest_crate_root = PathBuf::from(LINTCHECK_SOURCES).join(name);
+ if dest_crate_root.exists() {
- println!("Copying {:?} to {:?}", path, dest_crate_root);
-
- fn is_cache_dir(entry: &DirEntry) -> bool {
- std::fs::read(entry.path().join("CACHEDIR.TAG"))
- .map(|x| x.starts_with(b"Signature: 8a477f597d28d172789f06886806bc55"))
- .unwrap_or(false)
- }
++ println!("Deleting existing directory at {dest_crate_root:?}");
+ std::fs::remove_dir_all(&dest_crate_root).unwrap();
+ }
+
- clippy_args.extend(&["-Wclippy::pedantic", "-Wclippy::cargo"])
++ println!("Copying {path:?} to {dest_crate_root:?}");
+
+ for entry in WalkDir::new(path).into_iter().filter_entry(|e| !is_cache_dir(e)) {
+ let entry = entry.unwrap();
+ let entry_path = entry.path();
+ let relative_entry_path = entry_path.strip_prefix(path).unwrap();
+ let dest_path = dest_crate_root.join(relative_entry_path);
+ let metadata = entry_path.symlink_metadata().unwrap();
+
+ if metadata.is_dir() {
+ std::fs::create_dir(dest_path).unwrap();
+ } else if metadata.is_file() {
+ std::fs::copy(entry_path, dest_path).unwrap();
+ }
+ }
+
+ Crate {
+ version: String::from("local"),
+ name: name.clone(),
+ path: dest_crate_root,
+ options: options.clone(),
+ }
+ },
+ }
+ }
+}
+
+impl Crate {
+ /// Run `cargo clippy` on the `Crate` and collect and return all the lint warnings that clippy
+ /// issued
++ #[allow(clippy::too_many_arguments)]
+ fn run_clippy_lints(
+ &self,
+ cargo_clippy_path: &Path,
+ clippy_driver_path: &Path,
+ target_dir_index: &AtomicUsize,
+ total_crates_to_lint: usize,
+ config: &LintcheckConfig,
+ lint_filter: &Vec<String>,
+ server: &Option<LintcheckServer>,
+ ) -> Vec<ClippyWarning> {
+ // advance the atomic index by one
+ let index = target_dir_index.fetch_add(1, Ordering::SeqCst);
+ // "loop" the index within 0..thread_limit
+ let thread_index = index % config.max_jobs;
+ let perc = (index * 100) / total_crates_to_lint;
+
+ if config.max_jobs == 1 {
+ println!(
+ "{}/{} {}% Linting {} {}",
+ index, total_crates_to_lint, perc, &self.name, &self.version
+ );
+ } else {
+ println!(
+ "{}/{} {}% Linting {} {} in target dir {:?}",
+ index, total_crates_to_lint, perc, &self.name, &self.version, thread_index
+ );
+ }
+
+ let cargo_clippy_path = std::fs::canonicalize(cargo_clippy_path).unwrap();
+
+ let shared_target_dir = clippy_project_root().join("target/lintcheck/shared_target_dir");
+
+ let mut cargo_clippy_args = if config.fix {
+ vec!["--fix", "--"]
+ } else {
+ vec!["--", "--message-format=json", "--"]
+ };
+
+ let mut clippy_args = Vec::<&str>::new();
+ if let Some(options) = &self.options {
+ for opt in options {
+ clippy_args.push(opt);
+ }
+ } else {
- clippy_args.extend(lint_filter.iter().map(|filter| filter.as_str()))
++ clippy_args.extend(["-Wclippy::pedantic", "-Wclippy::cargo"]);
+ }
+
+ if lint_filter.is_empty() {
+ clippy_args.push("--cap-lints=warn");
+ } else {
+ clippy_args.push("--cap-lints=allow");
- .env(
- "CARGO_TARGET_DIR",
- shared_target_dir.join(format!("_{:?}", thread_index)),
- )
++ clippy_args.extend(lint_filter.iter().map(std::string::String::as_str));
+ }
+
+ if let Some(server) = server {
+ let target = shared_target_dir.join("recursive");
+
+ // `cargo clippy` is a wrapper around `cargo check` that mainly sets `RUSTC_WORKSPACE_WRAPPER` to
+ // `clippy-driver`. We do the same thing here with a couple changes:
+ //
+ // `RUSTC_WRAPPER` is used instead of `RUSTC_WORKSPACE_WRAPPER` so that we can lint all crate
+ // dependencies rather than only workspace members
+ //
+ // The wrapper is set to the `lintcheck` so we can force enable linting and ignore certain crates
+ // (see `crate::driver`)
+ let status = Command::new("cargo")
+ .arg("check")
+ .arg("--quiet")
+ .current_dir(&self.path)
+ .env("CLIPPY_ARGS", clippy_args.join("__CLIPPY_HACKERY__"))
+ .env("CARGO_TARGET_DIR", target)
+ .env("RUSTC_WRAPPER", env::current_exe().unwrap())
+ // Pass the absolute path so `crate::driver` can find `clippy-driver`, as it's executed in various
+ // different working directories
+ .env("CLIPPY_DRIVER", clippy_driver_path)
+ .env("LINTCHECK_SERVER", server.local_addr.to_string())
+ .status()
+ .expect("failed to run cargo");
+
+ assert_eq!(status.code(), Some(0));
+
+ return Vec::new();
+ }
+
+ cargo_clippy_args.extend(clippy_args);
+
+ let all_output = Command::new(&cargo_clippy_path)
+ // use the looping index to create individual target dirs
- "ERROR: failed to apply some suggetion to {} / to (sub)crate {}",
- self.name, subcrate
++ .env("CARGO_TARGET_DIR", shared_target_dir.join(format!("_{thread_index:?}")))
+ .args(&cargo_clippy_args)
+ .current_dir(&self.path)
+ .output()
+ .unwrap_or_else(|error| {
+ panic!(
+ "Encountered error:\n{:?}\ncargo_clippy_path: {}\ncrate path:{}\n",
+ error,
+ &cargo_clippy_path.display(),
+ &self.path.display()
+ );
+ });
+ let stdout = String::from_utf8_lossy(&all_output.stdout);
+ let stderr = String::from_utf8_lossy(&all_output.stderr);
+ let status = &all_output.status;
+
+ if !status.success() {
+ eprintln!(
+ "\nWARNING: bad exit status after checking {} {} \n",
+ self.name, self.version
+ );
+ }
+
+ if config.fix {
+ if let Some(stderr) = stderr
+ .lines()
+ .find(|line| line.contains("failed to automatically apply fixes suggested by rustc to crate"))
+ {
+ let subcrate = &stderr[63..];
+ println!(
- std::fs::read_to_string(&toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
++ "ERROR: failed to apply some suggetion to {} / to (sub)crate {subcrate}",
++ self.name
+ );
+ }
+ // fast path, we don't need the warnings anyway
+ return Vec::new();
+ }
+
+ // get all clippy warnings and ICEs
+ let warnings: Vec<ClippyWarning> = Message::parse_stream(stdout.as_bytes())
+ .filter_map(|msg| match msg {
+ Ok(Message::CompilerMessage(message)) => ClippyWarning::new(message.message, &self.name, &self.version),
+ _ => None,
+ })
+ .collect();
+
+ warnings
+ }
+}
+
+/// Builds clippy inside the repo to make sure we have a clippy executable we can use.
+fn build_clippy() {
+ let status = Command::new("cargo")
+ .arg("build")
+ .status()
+ .expect("Failed to build clippy!");
+ if !status.success() {
+ eprintln!("Error: Failed to compile Clippy!");
+ std::process::exit(1);
+ }
+}
+
+/// Read a `lintcheck_crates.toml` file
+fn read_crates(toml_path: &Path) -> (Vec<CrateSource>, RecursiveOptions) {
+ let toml_content: String =
- toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{}", toml_path.display(), e));
++ std::fs::read_to_string(toml_path).unwrap_or_else(|_| panic!("Failed to read {}", toml_path.display()));
+ let crate_list: SourceList =
- let tomlcrates: Vec<TomlCrate> = crate_list
- .crates
- .into_iter()
- .map(|(_cratename, tomlcrate)| tomlcrate)
- .collect();
++ toml::from_str(&toml_content).unwrap_or_else(|e| panic!("Failed to parse {}: \n{e}", toml_path.display()));
+ // parse the hashmap of the toml file into a list of crates
- tomlcrates.into_iter().for_each(|tk| {
++ let tomlcrates: Vec<TomlCrate> = crate_list.crates.into_values().collect();
+
+ // flatten TomlCrates into CrateSources (one TomlCrates may represent several versions of a crate =>
+ // multiple Cratesources)
+ let mut crate_sources = Vec::new();
- versions.iter().for_each(|ver| {
++ for tk in tomlcrates {
+ if let Some(ref path) = tk.path {
+ crate_sources.push(CrateSource::Path {
+ name: tk.name.clone(),
+ path: PathBuf::from(path),
+ options: tk.options.clone(),
+ });
+ } else if let Some(ref versions) = tk.versions {
+ // if we have multiple versions, save each one
- })
++ for ver in versions.iter() {
+ crate_sources.push(CrateSource::CratesIo {
+ name: tk.name.clone(),
+ version: ver.to_string(),
+ options: tk.options.clone(),
+ });
- eprintln!("tomlkrate: {:?}", tk);
- if tk.git_hash.is_some() != tk.git_url.is_some() {
- panic!("Error: Encountered TomlCrate with only one of git_hash and git_url!");
- }
- if tk.path.is_some() && (tk.git_hash.is_some() || tk.versions.is_some()) {
- panic!("Error: TomlCrate can only have one of 'git_.*', 'version' or 'path' fields");
- }
++ }
+ } else if tk.git_url.is_some() && tk.git_hash.is_some() {
+ // otherwise, we should have a git source
+ crate_sources.push(CrateSource::Git {
+ name: tk.name.clone(),
+ url: tk.git_url.clone().unwrap(),
+ commit: tk.git_hash.clone().unwrap(),
+ options: tk.options.clone(),
+ });
+ } else {
+ panic!("Invalid crate source: {tk:?}");
+ }
+
+ // if we have a version as well as a git data OR only one git data, something is funky
+ if tk.versions.is_some() && (tk.git_url.is_some() || tk.git_hash.is_some())
+ || tk.git_hash.is_some() != tk.git_url.is_some()
+ {
- });
++ eprintln!("tomlkrate: {tk:?}");
++ assert_eq!(
++ tk.git_hash.is_some(),
++ tk.git_url.is_some(),
++ "Error: Encountered TomlCrate with only one of git_hash and git_url!"
++ );
++ assert!(
++ tk.path.is_none() || (tk.git_hash.is_none() && tk.versions.is_none()),
++ "Error: TomlCrate can only have one of 'git_.*', 'version' or 'path' fields"
++ );
+ unreachable!("Failed to translate TomlCrate into CrateSource!");
+ }
- stats.sort_by_key(|(lint, count)| format!("{:0>4}, {}", count, lint));
++ }
+ // sort the crates
+ crate_sources.sort();
+
+ (crate_sources, crate_list.recursive)
+}
+
+/// Generate a short list of occurring lints-types and their count
+fn gather_stats(clippy_warnings: &[ClippyWarning]) -> (String, HashMap<&String, usize>) {
+ // count lint type occurrences
+ let mut counter: HashMap<&String, usize> = HashMap::new();
+ clippy_warnings
+ .iter()
+ .for_each(|wrn| *counter.entry(&wrn.lint_type).or_insert(0) += 1);
+
+ // collect into a tupled list for sorting
+ let mut stats: Vec<(&&String, &usize)> = counter.iter().map(|(lint, count)| (lint, count)).collect();
+ // sort by "000{count} {clippy::lintname}"
+ // to not have a lint with 200 and 2 warnings take the same spot
- .map(|(lint, count)| format!("| {:<50} | {:>4} |\n", lint, count))
++ stats.sort_by_key(|(lint, count)| format!("{count:0>4}, {lint}"));
+
+ let mut header = String::from("| lint | count |\n");
+ header.push_str("| -------------------------------------------------- | ----- |\n");
+ let stats_string = stats
+ .iter()
- if let Ok(metadata) = std::fs::metadata(&shared_target_dir) {
++ .map(|(lint, count)| format!("| {lint:<50} | {count:>4} |\n"))
+ .fold(header, |mut table, line| {
+ table.push_str(&line);
+ table
+ });
+
+ (stats_string, counter)
+}
+
+/// check if the latest modification of the logfile is older than the modification date of the
+/// clippy binary, if this is true, we should clean the lintchec shared target directory and recheck
+fn lintcheck_needs_rerun(lintcheck_logs_path: &Path, paths: [&Path; 2]) -> bool {
+ if !lintcheck_logs_path.exists() {
+ return true;
+ }
+
+ let clippy_modified: std::time::SystemTime = {
+ let [cargo, driver] = paths.map(|p| {
+ std::fs::metadata(p)
+ .expect("failed to get metadata of file")
+ .modified()
+ .expect("failed to get modification date")
+ });
+ // the oldest modification of either of the binaries
+ std::cmp::max(cargo, driver)
+ };
+
+ let logs_modified: std::time::SystemTime = std::fs::metadata(lintcheck_logs_path)
+ .expect("failed to get metadata of file")
+ .modified()
+ .expect("failed to get modification date");
+
+ // time is represented in seconds since X
+ // logs_modified 2 and clippy_modified 5 means clippy binary is older and we need to recheck
+ logs_modified < clippy_modified
+}
+
++#[allow(clippy::too_many_lines)]
+fn main() {
+ // We're being executed as a `RUSTC_WRAPPER` as part of `--recursive`
+ if let Ok(addr) = env::var("LINTCHECK_SERVER") {
+ driver::drive(&addr);
+ }
+
+ // assert that we launch lintcheck from the repo root (via cargo lintcheck)
+ if std::fs::metadata("lintcheck/Cargo.toml").is_err() {
+ eprintln!("lintcheck needs to be run from clippy's repo root!\nUse `cargo lintcheck` alternatively.");
+ std::process::exit(3);
+ }
+
+ let config = LintcheckConfig::new();
+
+ println!("Compiling clippy...");
+ build_clippy();
+ println!("Done compiling");
+
+ let cargo_clippy_path = fs::canonicalize(format!("target/debug/cargo-clippy{EXE_SUFFIX}")).unwrap();
+ let clippy_driver_path = fs::canonicalize(format!("target/debug/clippy-driver{EXE_SUFFIX}")).unwrap();
+
+ // if the clippy bin is newer than our logs, throw away target dirs to force clippy to
+ // refresh the logs
+ if lintcheck_needs_rerun(
+ &config.lintcheck_results_path,
+ [&cargo_clippy_path, &clippy_driver_path],
+ ) {
+ let shared_target_dir = "target/lintcheck/shared_target_dir";
+ // if we get an Err here, the shared target dir probably does simply not exist
- std::fs::remove_dir_all(&shared_target_dir)
++ if let Ok(metadata) = std::fs::metadata(shared_target_dir) {
+ if metadata.is_dir() {
+ println!("Clippy is newer than lint check logs, clearing lintcheck shared target dir...");
- let _ = fs::remove_dir_all("target/lintcheck/shared_target_dir/recursive");
++ std::fs::remove_dir_all(shared_target_dir)
+ .expect("failed to remove target/lintcheck/shared_target_dir");
+ }
+ }
+ }
+
+ // assert that clippy is found
+ assert!(
+ cargo_clippy_path.is_file(),
+ "target/debug/cargo-clippy binary not found! {}",
+ cargo_clippy_path.display()
+ );
+
+ let clippy_ver = std::process::Command::new(&cargo_clippy_path)
+ .arg("--version")
+ .output()
+ .map(|o| String::from_utf8_lossy(&o.stdout).into_owned())
+ .expect("could not get clippy version!");
+
+ // download and extract the crates, then run clippy on them and collect clippy's warnings
+ // flatten into one big list of warnings
+
+ let (crates, recursive_options) = read_crates(&config.sources_toml_path);
+ let old_stats = read_stats_from_file(&config.lintcheck_results_path);
+
+ let counter = AtomicUsize::new(1);
+ let lint_filter: Vec<String> = config
+ .lint_filter
+ .iter()
+ .map(|filter| {
+ let mut filter = filter.clone();
+ filter.insert_str(0, "--force-warn=");
+ filter
+ })
+ .collect();
+
+ let crates: Vec<Crate> = crates
+ .into_iter()
+ .filter(|krate| {
+ if let Some(only_one_crate) = &config.only {
+ let name = match krate {
+ CrateSource::CratesIo { name, .. }
+ | CrateSource::Git { name, .. }
+ | CrateSource::Path { name, .. } => name,
+ };
+
+ name == only_one_crate
+ } else {
+ true
+ }
+ })
+ .map(|krate| krate.download_and_extract())
+ .collect();
+
+ if crates.is_empty() {
+ eprintln!(
+ "ERROR: could not find crate '{}' in lintcheck/lintcheck_crates.toml",
+ config.only.unwrap(),
+ );
+ std::process::exit(1);
+ }
+
+ // run parallel with rayon
+
+ // This helps when we check many small crates with dep-trees that don't have a lot of branches in
+ // order to achieve some kind of parallelism
+
+ rayon::ThreadPoolBuilder::new()
+ .num_threads(config.max_jobs)
+ .build_global()
+ .unwrap();
+
+ let server = config.recursive.then(|| {
- for (cratename, msg) in ices.iter() {
- let _ = write!(text, "{}: '{}'", cratename, msg);
++ fs::remove_dir_all("target/lintcheck/shared_target_dir/recursive").unwrap_or_default();
+
+ LintcheckServer::spawn(recursive_options)
+ });
+
+ let mut clippy_warnings: Vec<ClippyWarning> = crates
+ .par_iter()
+ .flat_map(|krate| {
+ krate.run_clippy_lints(
+ &cargo_clippy_path,
+ &clippy_driver_path,
+ &counter,
+ crates.len(),
+ &config,
+ &lint_filter,
+ &server,
+ )
+ })
+ .collect();
+
+ if let Some(server) = server {
+ clippy_warnings.extend(server.warnings());
+ }
+
+ // if we are in --fix mode, don't change the log files, terminate here
+ if config.fix {
+ return;
+ }
+
+ // generate some stats
+ let (stats_formatted, new_stats) = gather_stats(&clippy_warnings);
+
+ // grab crashes/ICEs, save the crate name and the ice message
+ let ices: Vec<(&String, &String)> = clippy_warnings
+ .iter()
+ .filter(|warning| warning.is_ice)
+ .map(|w| (&w.crate_name, &w.message))
+ .collect();
+
+ let mut all_msgs: Vec<String> = clippy_warnings
+ .iter()
+ .map(|warn| warn.to_output(config.markdown))
+ .collect();
+ all_msgs.sort();
+ all_msgs.push("\n\n### Stats:\n\n".into());
+ all_msgs.push(stats_formatted);
+
+ // save the text into lintcheck-logs/logs.txt
+ let mut text = clippy_ver; // clippy version number on top
+ text.push_str("\n### Reports\n\n");
+ if config.markdown {
+ text.push_str("| file | lint | message |\n");
+ text.push_str("| --- | --- | --- |\n");
+ }
+ write!(text, "{}", all_msgs.join("")).unwrap();
+ text.push_str("\n\n### ICEs:\n");
- .filter(|(old_key, old_val)| new_stats.get::<&String>(&old_key) == Some(old_val))
++ for (cratename, msg) in &ices {
++ let _ = write!(text, "{cratename}: '{msg}'");
+ }
+
+ println!("Writing logs to {}", config.lintcheck_results_path.display());
+ fs::create_dir_all(config.lintcheck_results_path.parent().unwrap()).unwrap();
+ fs::write(&config.lintcheck_results_path, text).unwrap();
+
+ print_stats(old_stats, new_stats, &config.lint_filter);
+}
+
+/// read the previous stats from the lintcheck-log file
+fn read_stats_from_file(file_path: &Path) -> HashMap<String, usize> {
+ let file_content: String = match std::fs::read_to_string(file_path).ok() {
+ Some(content) => content,
+ None => {
+ return HashMap::new();
+ },
+ };
+
+ let lines: Vec<String> = file_content.lines().map(ToString::to_string).collect();
+
+ lines
+ .iter()
+ .skip_while(|line| line.as_str() != "### Stats:")
+ // Skipping the table header and the `Stats:` label
+ .skip(4)
+ .take_while(|line| line.starts_with("| "))
+ .filter_map(|line| {
+ let mut spl = line.split('|');
+ // Skip the first `|` symbol
+ spl.next();
+ if let (Some(lint), Some(count)) = (spl.next(), spl.next()) {
+ Some((lint.trim().to_string(), count.trim().parse::<usize>().unwrap()))
+ } else {
+ None
+ }
+ })
+ .collect::<HashMap<String, usize>>()
+}
+
+/// print how lint counts changed between runs
+fn print_stats(old_stats: HashMap<String, usize>, new_stats: HashMap<&String, usize>, lint_filter: &Vec<String>) {
+ let same_in_both_hashmaps = old_stats
+ .iter()
- same_in_both_hashmaps.iter().for_each(|(k, v)| {
++ .filter(|(old_key, old_val)| new_stats.get::<&String>(old_key) == Some(old_val))
+ .map(|(k, v)| (k.to_string(), *v))
+ .collect::<Vec<(String, usize)>>();
+
+ let mut old_stats_deduped = old_stats;
+ let mut new_stats_deduped = new_stats;
+
+ // remove duplicates from both hashmaps
- });
++ for (k, v) in &same_in_both_hashmaps {
+ assert!(old_stats_deduped.remove(k) == Some(*v));
+ assert!(new_stats_deduped.remove(k) == Some(*v));
- .filter(|(new_key, _)| old_stats_deduped.get::<str>(&new_key).is_none())
++ }
+
+ println!("\nStats:");
+
+ // list all new counts (key is in new stats but not in old stats)
+ new_stats_deduped
+ .iter()
- println!("{} 0 => {}", new_key, new_value);
++ .filter(|(new_key, _)| old_stats_deduped.get::<str>(new_key).is_none())
+ .for_each(|(new_key, new_value)| {
- .filter(|(new_key, _new_val)| old_stats_deduped.get::<str>(&new_key).is_some())
++ println!("{new_key} 0 => {new_value}");
+ });
+
+ // list all changed counts (key is in both maps but value differs)
+ new_stats_deduped
+ .iter()
- let old_val = old_stats_deduped.get::<str>(&new_key).unwrap();
- println!("{} {} => {}", new_key, old_val, new_val);
++ .filter(|(new_key, _new_val)| old_stats_deduped.get::<str>(new_key).is_some())
+ .for_each(|(new_key, new_val)| {
- .filter(|(old_key, _)| new_stats_deduped.get::<&String>(&old_key).is_none())
++ let old_val = old_stats_deduped.get::<str>(new_key).unwrap();
++ println!("{new_key} {old_val} => {new_val}");
+ });
+
+ // list all gone counts (key is in old status but not in new stats)
+ old_stats_deduped
+ .iter()
- println!("{} {} => 0", old_key, old_value);
++ .filter(|(old_key, _)| new_stats_deduped.get::<&String>(old_key).is_none())
+ .filter(|(old_key, _)| lint_filter.is_empty() || lint_filter.contains(old_key))
+ .for_each(|(old_key, old_value)| {
- if err.kind() != ErrorKind::AlreadyExists {
- panic!("cannot create lintcheck target dir");
- }
++ println!("{old_key} {old_value} => 0");
+ });
+}
+
+/// Create necessary directories to run the lintcheck tool.
+///
+/// # Panics
+///
+/// This function panics if creating one of the dirs fails.
+fn create_dirs(krate_download_dir: &Path, extract_dir: &Path) {
+ std::fs::create_dir("target/lintcheck/").unwrap_or_else(|err| {
- std::fs::create_dir(&krate_download_dir).unwrap_or_else(|err| {
- if err.kind() != ErrorKind::AlreadyExists {
- panic!("cannot create crate download dir");
- }
++ assert_eq!(
++ err.kind(),
++ ErrorKind::AlreadyExists,
++ "cannot create lintcheck target dir"
++ );
+ });
- std::fs::create_dir(&extract_dir).unwrap_or_else(|err| {
- if err.kind() != ErrorKind::AlreadyExists {
- panic!("cannot create crate extraction dir");
- }
++ std::fs::create_dir(krate_download_dir).unwrap_or_else(|err| {
++ assert_eq!(err.kind(), ErrorKind::AlreadyExists, "cannot create crate download dir");
+ });
- .args(&args)
++ std::fs::create_dir(extract_dir).unwrap_or_else(|err| {
++ assert_eq!(
++ err.kind(),
++ ErrorKind::AlreadyExists,
++ "cannot create crate extraction dir"
++ );
+ });
+}
+
+/// Returns the path to the Clippy project directory
+#[must_use]
+fn clippy_project_root() -> &'static Path {
+ Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap()
+}
+
+#[test]
+fn lintcheck_test() {
+ let args = [
+ "run",
+ "--target-dir",
+ "lintcheck/target",
+ "--manifest-path",
+ "./lintcheck/Cargo.toml",
+ "--",
+ "--crates-toml",
+ "lintcheck/test_sources.toml",
+ ];
+ let status = std::process::Command::new("cargo")
++ .args(args)
+ .current_dir("..") // repo root
+ .status();
+ //.output();
+
+ assert!(status.unwrap().success());
+}
--- /dev/null
- //! this allows [crate::driver] to be run for every dependency. The driver connects to
- //! [LintcheckServer] to ask if it should be skipped, and if not sends the stderr of running clippy
- //! on the crate to the server
+//! In `--recursive` mode we set the `lintcheck` binary as the `RUSTC_WRAPPER` of `cargo check`,
- sender,
++//! this allows [`crate::driver`] to be run for every dependency. The driver connects to
++//! [`LintcheckServer`] to ask if it should be skipped, and if not sends the stderr of running
++//! clippy on the crate to the server
+
+use crate::ClippyWarning;
+use crate::RecursiveOptions;
+
+use std::collections::HashSet;
+use std::io::{BufRead, BufReader, Read, Write};
+use std::net::{SocketAddr, TcpListener, TcpStream};
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+use cargo_metadata::diagnostic::Diagnostic;
+use crossbeam_channel::{Receiver, Sender};
+use serde::de::DeserializeOwned;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Eq, Hash, PartialEq, Clone, Serialize, Deserialize)]
+pub(crate) struct DriverInfo {
+ pub package_name: String,
+ pub crate_name: String,
+ pub version: String,
+}
+
+pub(crate) fn serialize_line<T, W>(value: &T, writer: &mut W)
+where
+ T: Serialize,
+ W: Write,
+{
+ let mut buf = serde_json::to_vec(&value).expect("failed to serialize");
+ buf.push(b'\n');
+ writer.write_all(&buf).expect("write_all failed");
+}
+
+pub(crate) fn deserialize_line<T, R>(reader: &mut R) -> T
+where
+ T: DeserializeOwned,
+ R: BufRead,
+{
+ let mut string = String::new();
+ reader.read_line(&mut string).expect("read_line failed");
+ serde_json::from_str(&string).expect("failed to deserialize")
+}
+
+fn process_stream(
+ stream: TcpStream,
+ sender: &Sender<ClippyWarning>,
+ options: &RecursiveOptions,
+ seen: &Mutex<HashSet<DriverInfo>>,
+) {
+ let mut stream = BufReader::new(stream);
+
+ let driver_info: DriverInfo = deserialize_line(&mut stream);
+
+ let unseen = seen.lock().unwrap().insert(driver_info.clone());
+ let ignored = options.ignore.contains(&driver_info.package_name);
+ let should_run = unseen && !ignored;
+
+ serialize_line(&should_run, stream.get_mut());
+
+ let mut stderr = String::new();
+ stream.read_to_string(&mut stderr).unwrap();
+
+ let messages = stderr
+ .lines()
+ .filter_map(|json_msg| serde_json::from_str::<Diagnostic>(json_msg).ok())
+ .filter_map(|diag| ClippyWarning::new(diag, &driver_info.package_name, &driver_info.version));
+
+ for message in messages {
+ sender.send(message).unwrap();
+ }
+}
+
+pub(crate) struct LintcheckServer {
+ pub local_addr: SocketAddr,
+ receiver: Receiver<ClippyWarning>,
+ sender: Arc<Sender<ClippyWarning>>,
+}
+
+impl LintcheckServer {
+ pub fn spawn(options: RecursiveOptions) -> Self {
+ let listener = TcpListener::bind("localhost:0").unwrap();
+ let local_addr = listener.local_addr().unwrap();
+
+ let (sender, receiver) = crossbeam_channel::unbounded::<ClippyWarning>();
+ let sender = Arc::new(sender);
+ // The spawned threads hold a `Weak<Sender>` so that they don't keep the channel connected
+ // indefinitely
+ let sender_weak = Arc::downgrade(&sender);
+
+ // Ignore dependencies multiple times, e.g. for when it's both checked and compiled for a
+ // build dependency
+ let seen = Mutex::default();
+
+ thread::spawn(move || {
+ thread::scope(|s| {
+ s.spawn(|| {
+ while let Ok((stream, _)) = listener.accept() {
+ let sender = sender_weak.upgrade().expect("received connection after server closed");
+ let options = &options;
+ let seen = &seen;
+ s.spawn(move || process_stream(stream, &sender, options, seen));
+ }
+ });
+ });
+ });
+
+ Self {
+ local_addr,
+ receiver,
++ sender,
+ }
+ }
+
+ pub fn warnings(self) -> impl Iterator<Item = ClippyWarning> {
+ // causes the channel to become disconnected so that the receiver iterator ends
+ drop(self.sender);
+
+ self.receiver.into_iter()
+ }
+}
--- /dev/null
- channel = "nightly-2022-10-06"
+[toolchain]
++channel = "nightly-2022-10-20"
+components = ["cargo", "llvm-tools-preview", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
+// autogenerated. Please look at /clippy_dev/src/update_lints.rs
+
+macro_rules! include_lint {
+ ($file_name: expr) => {
+ include_str!($file_name)
+ };
+}
+
+macro_rules! docs {
+ ($($lint_name: expr,)*) => {
+ pub fn explain(lint: &str) {
+ println!("{}", match lint {
+ $(
+ $lint_name => include_lint!(concat!("docs/", concat!($lint_name, ".txt"))),
+ )*
+ _ => "unknown lint",
+ })
+ }
+ }
+}
+
+docs! {
+ "absurd_extreme_comparisons",
+ "alloc_instead_of_core",
+ "allow_attributes_without_reason",
+ "almost_complete_letter_range",
+ "almost_swapped",
+ "approx_constant",
+ "arithmetic_side_effects",
+ "as_conversions",
++ "as_ptr_cast_mut",
+ "as_underscore",
+ "assertions_on_constants",
+ "assertions_on_result_states",
+ "assign_op_pattern",
+ "async_yields_async",
+ "await_holding_invalid_type",
+ "await_holding_lock",
+ "await_holding_refcell_ref",
+ "bad_bit_mask",
+ "bind_instead_of_map",
+ "blanket_clippy_restriction_lints",
+ "blocks_in_if_conditions",
+ "bool_assert_comparison",
+ "bool_comparison",
+ "bool_to_int_with_if",
+ "borrow_as_ptr",
+ "borrow_deref_ref",
+ "borrow_interior_mutable_const",
+ "borrowed_box",
+ "box_collection",
+ "box_default",
+ "boxed_local",
+ "branches_sharing_code",
+ "builtin_type_shadow",
+ "bytes_count_to_len",
+ "bytes_nth",
+ "cargo_common_metadata",
+ "case_sensitive_file_extension_comparisons",
+ "cast_abs_to_unsigned",
+ "cast_enum_constructor",
+ "cast_enum_truncation",
+ "cast_lossless",
++ "cast_nan_to_int",
+ "cast_possible_truncation",
+ "cast_possible_wrap",
+ "cast_precision_loss",
+ "cast_ptr_alignment",
+ "cast_ref_to_mut",
+ "cast_sign_loss",
+ "cast_slice_different_sizes",
+ "cast_slice_from_raw_parts",
+ "char_lit_as_u8",
+ "chars_last_cmp",
+ "chars_next_cmp",
+ "checked_conversions",
+ "clone_double_ref",
+ "clone_on_copy",
+ "clone_on_ref_ptr",
+ "cloned_instead_of_copied",
+ "cmp_nan",
+ "cmp_null",
+ "cmp_owned",
+ "cognitive_complexity",
+ "collapsible_else_if",
+ "collapsible_if",
+ "collapsible_match",
+ "collapsible_str_replace",
+ "comparison_chain",
+ "comparison_to_empty",
+ "copy_iterator",
+ "crate_in_macro_def",
+ "create_dir",
+ "crosspointer_transmute",
+ "dbg_macro",
+ "debug_assert_with_mut_call",
+ "decimal_literal_representation",
+ "declare_interior_mutable_const",
+ "default_instead_of_iter_empty",
+ "default_numeric_fallback",
+ "default_trait_access",
+ "default_union_representation",
+ "deprecated_cfg_attr",
+ "deprecated_semver",
+ "deref_addrof",
+ "deref_by_slicing",
+ "derivable_impls",
+ "derive_hash_xor_eq",
+ "derive_ord_xor_partial_ord",
+ "derive_partial_eq_without_eq",
+ "disallowed_macros",
+ "disallowed_methods",
+ "disallowed_names",
+ "disallowed_script_idents",
+ "disallowed_types",
+ "diverging_sub_expression",
+ "doc_link_with_quotes",
+ "doc_markdown",
+ "double_comparisons",
+ "double_must_use",
+ "double_neg",
+ "double_parens",
+ "drop_copy",
+ "drop_non_drop",
+ "drop_ref",
+ "duplicate_mod",
+ "duplicate_underscore_argument",
+ "duration_subsec",
+ "else_if_without_else",
+ "empty_drop",
+ "empty_enum",
+ "empty_line_after_outer_attr",
+ "empty_loop",
+ "empty_structs_with_brackets",
+ "enum_clike_unportable_variant",
+ "enum_glob_use",
+ "enum_variant_names",
+ "eq_op",
+ "equatable_if_let",
+ "erasing_op",
+ "err_expect",
+ "excessive_precision",
+ "exhaustive_enums",
+ "exhaustive_structs",
+ "exit",
+ "expect_fun_call",
+ "expect_used",
+ "expl_impl_clone_on_copy",
+ "explicit_auto_deref",
+ "explicit_counter_loop",
+ "explicit_deref_methods",
+ "explicit_into_iter_loop",
+ "explicit_iter_loop",
+ "explicit_write",
+ "extend_with_drain",
+ "extra_unused_lifetimes",
+ "fallible_impl_from",
+ "field_reassign_with_default",
+ "filetype_is_file",
+ "filter_map_identity",
+ "filter_map_next",
+ "filter_next",
+ "flat_map_identity",
+ "flat_map_option",
+ "float_arithmetic",
+ "float_cmp",
+ "float_cmp_const",
+ "float_equality_without_abs",
+ "fn_address_comparisons",
+ "fn_params_excessive_bools",
+ "fn_to_numeric_cast",
+ "fn_to_numeric_cast_any",
+ "fn_to_numeric_cast_with_truncation",
+ "for_kv_map",
+ "forget_copy",
+ "forget_non_drop",
+ "forget_ref",
+ "format_in_format_args",
+ "format_push_string",
+ "from_iter_instead_of_collect",
+ "from_over_into",
+ "from_str_radix_10",
+ "future_not_send",
+ "get_first",
+ "get_last_with_len",
+ "get_unwrap",
+ "identity_op",
+ "if_let_mutex",
+ "if_not_else",
+ "if_same_then_else",
+ "if_then_some_else_none",
+ "ifs_same_cond",
+ "implicit_clone",
+ "implicit_hasher",
+ "implicit_return",
+ "implicit_saturating_add",
+ "implicit_saturating_sub",
+ "imprecise_flops",
+ "inconsistent_digit_grouping",
+ "inconsistent_struct_constructor",
+ "index_refutable_slice",
+ "indexing_slicing",
+ "ineffective_bit_mask",
+ "inefficient_to_string",
+ "infallible_destructuring_match",
+ "infinite_iter",
+ "inherent_to_string",
+ "inherent_to_string_shadow_display",
+ "init_numbered_fields",
+ "inline_always",
+ "inline_asm_x86_att_syntax",
+ "inline_asm_x86_intel_syntax",
+ "inline_fn_without_body",
+ "inspect_for_each",
+ "int_plus_one",
+ "integer_arithmetic",
+ "integer_division",
+ "into_iter_on_ref",
+ "invalid_null_ptr_usage",
+ "invalid_regex",
+ "invalid_upcast_comparisons",
+ "invalid_utf8_in_unchecked",
+ "invisible_characters",
+ "is_digit_ascii_radix",
+ "items_after_statements",
+ "iter_cloned_collect",
+ "iter_count",
+ "iter_kv_map",
+ "iter_next_loop",
+ "iter_next_slice",
+ "iter_not_returning_iterator",
+ "iter_nth",
+ "iter_nth_zero",
+ "iter_on_empty_collections",
+ "iter_on_single_items",
+ "iter_overeager_cloned",
+ "iter_skip_next",
+ "iter_with_drain",
+ "iterator_step_by_zero",
+ "just_underscores_and_digits",
+ "large_const_arrays",
+ "large_digit_groups",
+ "large_enum_variant",
+ "large_include_file",
+ "large_stack_arrays",
+ "large_types_passed_by_value",
+ "len_without_is_empty",
+ "len_zero",
+ "let_and_return",
+ "let_underscore_drop",
+ "let_underscore_lock",
+ "let_underscore_must_use",
+ "let_unit_value",
+ "linkedlist",
+ "lossy_float_literal",
+ "macro_use_imports",
+ "main_recursion",
+ "manual_assert",
+ "manual_async_fn",
+ "manual_bits",
+ "manual_clamp",
++ "manual_filter",
+ "manual_filter_map",
+ "manual_find",
+ "manual_find_map",
+ "manual_flatten",
+ "manual_instant_elapsed",
+ "manual_map",
+ "manual_memcpy",
+ "manual_non_exhaustive",
+ "manual_ok_or",
+ "manual_range_contains",
+ "manual_rem_euclid",
+ "manual_retain",
+ "manual_saturating_arithmetic",
+ "manual_split_once",
+ "manual_str_repeat",
+ "manual_string_new",
+ "manual_strip",
+ "manual_swap",
+ "manual_unwrap_or",
+ "many_single_char_names",
+ "map_clone",
+ "map_collect_result_unit",
+ "map_entry",
+ "map_err_ignore",
+ "map_flatten",
+ "map_identity",
+ "map_unwrap_or",
+ "match_as_ref",
+ "match_bool",
+ "match_like_matches_macro",
+ "match_on_vec_items",
+ "match_overlapping_arm",
+ "match_ref_pats",
+ "match_result_ok",
+ "match_same_arms",
+ "match_single_binding",
+ "match_str_case_mismatch",
+ "match_wild_err_arm",
+ "match_wildcard_for_single_variants",
+ "maybe_infinite_iter",
+ "mem_forget",
+ "mem_replace_option_with_none",
+ "mem_replace_with_default",
+ "mem_replace_with_uninit",
+ "min_max",
+ "mismatched_target_os",
+ "mismatching_type_param_order",
+ "misrefactored_assign_op",
+ "missing_const_for_fn",
+ "missing_docs_in_private_items",
+ "missing_enforced_import_renames",
+ "missing_errors_doc",
+ "missing_inline_in_public_items",
+ "missing_panics_doc",
+ "missing_safety_doc",
+ "missing_spin_loop",
++ "missing_trait_methods",
+ "mistyped_literal_suffixes",
+ "mixed_case_hex_literals",
+ "mixed_read_write_in_expression",
+ "mod_module_files",
+ "module_inception",
+ "module_name_repetitions",
+ "modulo_arithmetic",
+ "modulo_one",
+ "multi_assignments",
+ "multiple_crate_versions",
+ "multiple_inherent_impl",
+ "must_use_candidate",
+ "must_use_unit",
+ "mut_from_ref",
+ "mut_mut",
+ "mut_mutex_lock",
+ "mut_range_bound",
+ "mutable_key_type",
+ "mutex_atomic",
+ "mutex_integer",
+ "naive_bytecount",
+ "needless_arbitrary_self_type",
+ "needless_bitwise_bool",
+ "needless_bool",
+ "needless_borrow",
+ "needless_borrowed_reference",
+ "needless_collect",
+ "needless_continue",
+ "needless_doctest_main",
+ "needless_for_each",
+ "needless_late_init",
+ "needless_lifetimes",
+ "needless_match",
+ "needless_option_as_deref",
+ "needless_option_take",
+ "needless_parens_on_range_literals",
+ "needless_pass_by_value",
+ "needless_question_mark",
+ "needless_range_loop",
+ "needless_return",
+ "needless_splitn",
+ "needless_update",
+ "neg_cmp_op_on_partial_ord",
+ "neg_multiply",
+ "negative_feature_names",
+ "never_loop",
+ "new_ret_no_self",
+ "new_without_default",
+ "no_effect",
+ "no_effect_replace",
+ "no_effect_underscore_binding",
+ "non_ascii_literal",
+ "non_octal_unix_permissions",
+ "non_send_fields_in_send_ty",
+ "nonminimal_bool",
+ "nonsensical_open_options",
+ "nonstandard_macro_braces",
+ "not_unsafe_ptr_arg_deref",
+ "obfuscated_if_else",
+ "octal_escapes",
+ "ok_expect",
+ "only_used_in_recursion",
+ "op_ref",
+ "option_as_ref_deref",
+ "option_env_unwrap",
+ "option_filter_map",
+ "option_if_let_else",
+ "option_map_or_none",
+ "option_map_unit_fn",
+ "option_option",
+ "or_fun_call",
+ "or_then_unwrap",
+ "out_of_bounds_indexing",
+ "overflow_check_conditional",
+ "overly_complex_bool_expr",
+ "panic",
+ "panic_in_result_fn",
+ "panicking_unwrap",
++ "partial_pub_fields",
+ "partialeq_ne_impl",
+ "partialeq_to_none",
+ "path_buf_push_overwrite",
+ "pattern_type_mismatch",
+ "possible_missing_comma",
+ "precedence",
+ "print_in_format_impl",
+ "print_literal",
+ "print_stderr",
+ "print_stdout",
+ "print_with_newline",
+ "println_empty_string",
+ "ptr_arg",
+ "ptr_as_ptr",
+ "ptr_eq",
+ "ptr_offset_with_cast",
+ "pub_use",
+ "question_mark",
+ "range_minus_one",
+ "range_plus_one",
+ "range_zip_with_len",
+ "rc_buffer",
+ "rc_clone_in_vec_init",
+ "rc_mutex",
+ "read_zero_byte_vec",
+ "recursive_format_impl",
+ "redundant_allocation",
+ "redundant_clone",
+ "redundant_closure",
+ "redundant_closure_call",
+ "redundant_closure_for_method_calls",
+ "redundant_else",
+ "redundant_feature_names",
+ "redundant_field_names",
+ "redundant_pattern",
+ "redundant_pattern_matching",
+ "redundant_pub_crate",
+ "redundant_slicing",
+ "redundant_static_lifetimes",
+ "ref_binding_to_reference",
+ "ref_option_ref",
+ "repeat_once",
+ "rest_pat_in_fully_bound_structs",
+ "result_large_err",
+ "result_map_or_into_option",
+ "result_map_unit_fn",
+ "result_unit_err",
+ "return_self_not_must_use",
+ "reversed_empty_ranges",
+ "same_functions_in_if_condition",
+ "same_item_push",
+ "same_name_method",
+ "search_is_some",
+ "self_assignment",
+ "self_named_constructors",
+ "self_named_module_files",
+ "semicolon_if_nothing_returned",
+ "separated_literal_suffix",
+ "serde_api_misuse",
+ "shadow_reuse",
+ "shadow_same",
+ "shadow_unrelated",
+ "short_circuit_statement",
+ "should_implement_trait",
+ "significant_drop_in_scrutinee",
+ "similar_names",
+ "single_char_add_str",
+ "single_char_lifetime_names",
+ "single_char_pattern",
+ "single_component_path_imports",
+ "single_element_loop",
+ "single_match",
+ "single_match_else",
+ "size_of_in_element_count",
+ "skip_while_next",
+ "slow_vector_initialization",
+ "stable_sort_primitive",
+ "std_instead_of_alloc",
+ "std_instead_of_core",
+ "str_to_string",
+ "string_add",
+ "string_add_assign",
+ "string_extend_chars",
+ "string_from_utf8_as_bytes",
+ "string_lit_as_bytes",
+ "string_slice",
+ "string_to_string",
+ "strlen_on_c_strings",
+ "struct_excessive_bools",
+ "suboptimal_flops",
+ "suspicious_arithmetic_impl",
+ "suspicious_assignment_formatting",
+ "suspicious_else_formatting",
+ "suspicious_map",
+ "suspicious_op_assign_impl",
+ "suspicious_operation_groupings",
+ "suspicious_splitn",
+ "suspicious_to_owned",
+ "suspicious_unary_op_formatting",
+ "swap_ptr_to_ref",
+ "tabs_in_doc_comments",
+ "temporary_assignment",
+ "to_digit_is_some",
+ "to_string_in_format_args",
+ "todo",
+ "too_many_arguments",
+ "too_many_lines",
+ "toplevel_ref_arg",
+ "trailing_empty_array",
+ "trait_duplication_in_bounds",
+ "transmute_bytes_to_str",
+ "transmute_float_to_int",
+ "transmute_int_to_bool",
+ "transmute_int_to_char",
+ "transmute_int_to_float",
+ "transmute_num_to_bytes",
+ "transmute_ptr_to_ptr",
+ "transmute_ptr_to_ref",
+ "transmute_undefined_repr",
+ "transmutes_expressible_as_ptr_casts",
+ "transmuting_null",
+ "trim_split_whitespace",
+ "trivial_regex",
+ "trivially_copy_pass_by_ref",
+ "try_err",
+ "type_complexity",
+ "type_repetition_in_bounds",
+ "undocumented_unsafe_blocks",
+ "undropped_manually_drops",
+ "unicode_not_nfc",
+ "unimplemented",
+ "uninit_assumed_init",
+ "uninit_vec",
+ "uninlined_format_args",
+ "unit_arg",
+ "unit_cmp",
+ "unit_hash",
+ "unit_return_expecting_ord",
+ "unnecessary_cast",
+ "unnecessary_filter_map",
+ "unnecessary_find_map",
+ "unnecessary_fold",
+ "unnecessary_join",
+ "unnecessary_lazy_evaluations",
+ "unnecessary_mut_passed",
+ "unnecessary_operation",
+ "unnecessary_owned_empty_strings",
+ "unnecessary_self_imports",
+ "unnecessary_sort_by",
+ "unnecessary_to_owned",
+ "unnecessary_unwrap",
+ "unnecessary_wraps",
+ "unneeded_field_pattern",
+ "unneeded_wildcard_pattern",
+ "unnested_or_patterns",
+ "unreachable",
+ "unreadable_literal",
+ "unsafe_derive_deserialize",
+ "unsafe_removed_from_name",
+ "unseparated_literal_suffix",
+ "unsound_collection_transmute",
+ "unused_async",
++ "unused_format_specs",
+ "unused_io_amount",
+ "unused_peekable",
+ "unused_rounding",
+ "unused_self",
+ "unused_unit",
+ "unusual_byte_groupings",
+ "unwrap_in_result",
+ "unwrap_or_else_default",
+ "unwrap_used",
+ "upper_case_acronyms",
+ "use_debug",
+ "use_self",
+ "used_underscore_binding",
+ "useless_asref",
+ "useless_attribute",
+ "useless_conversion",
+ "useless_format",
+ "useless_let_if_seq",
+ "useless_transmute",
+ "useless_vec",
+ "vec_box",
+ "vec_init_then_push",
+ "vec_resize_to_zero",
+ "verbose_bit_mask",
+ "verbose_file_reads",
+ "vtable_address_comparisons",
+ "while_immutable_condition",
+ "while_let_loop",
+ "while_let_on_iterator",
+ "wildcard_dependencies",
+ "wildcard_enum_match_arm",
+ "wildcard_imports",
+ "wildcard_in_or_patterns",
+ "write_literal",
+ "write_with_newline",
+ "writeln_empty_string",
+ "wrong_self_convention",
+ "wrong_transmute",
+ "zero_divided_by_zero",
+ "zero_prefixed_literal",
+ "zero_ptr",
+ "zero_sized_map_values",
+ "zst_offset",
+
+}
--- /dev/null
--- /dev/null
++### What it does
++Checks for the result of a `&self`-taking `as_ptr` being cast to a mutable pointer
++
++### Why is this bad?
++Since `as_ptr` takes a `&self`, the pointer won't have write permissions unless interior
++mutability is used, making it unlikely that having it as a mutable pointer is correct.
++
++### Example
++```
++let string = String::with_capacity(1);
++let ptr = string.as_ptr() as *mut u8;
++unsafe { ptr.write(4) }; // UNDEFINED BEHAVIOUR
++```
++Use instead:
++```
++let mut string = String::with_capacity(1);
++let ptr = string.as_mut_ptr();
++unsafe { ptr.write(4) };
++```
--- /dev/null
- ### Known problems
- The lint may miss some cases (e.g. Box::new(String::from(""))).
- On the other hand, it will trigger on cases where the `default`
- code comes from a macro that does something different based on
- e.g. target operating system.
-
+### What it does
+checks for `Box::new(T::default())`, which is better written as
+`Box::<T>::default()`.
+
+### Why is this bad?
+First, it's more complex, involving two calls instead of one.
+Second, `Box::default()` can be faster
+[in certain cases](https://nnethercote.github.io/perf-book/standard-library-types.html#box).
+
+### Example
+```
+let x: Box<String> = Box::new(Default::default());
+```
+Use instead:
+```
+let x: Box<String> = Box::default();
+```
--- /dev/null
--- /dev/null
++### What it does
++Checks for a known NaN float being cast to an integer
++
++### Why is this bad?
++NaNs are cast into zero, so one could simply use this and make the
++code more readable. The lint could also hint at a programmer error.
++
++### Example
++```
++let _: (0.0_f32 / 0.0) as u64;
++```
++Use instead:
++```
++let _: = 0_u64;
++```
--- /dev/null
--- /dev/null
++### What it does
++Checks for usages of `match` which could be implemented using `filter`
++
++### Why is this bad?
++Using the `filter` method is clearer and more concise.
++
++### Example
++```
++match Some(0) {
++ Some(x) => if x % 2 == 0 {
++ Some(x)
++ } else {
++ None
++ },
++ None => None,
++};
++```
++Use instead:
++```
++Some(0).filter(|&x| x % 2 == 0);
++```
--- /dev/null
--- /dev/null
++### What it does
++Checks if a provided method is used implicitly by a trait
++implementation. A usage example would be a wrapper where every method
++should perform some operation before delegating to the inner type's
++implemenation.
++
++This lint should typically be enabled on a specific trait `impl` item
++rather than globally.
++
++### Why is this bad?
++Indicates that a method is missing.
++
++### Example
++```
++trait Trait {
++ fn required();
++
++ fn provided() {}
++}
++
++#[warn(clippy::missing_trait_methods)]
++impl Trait for Type {
++ fn required() { /* ... */ }
++}
++```
++Use instead:
++```
++trait Trait {
++ fn required();
++
++ fn provided() {}
++}
++
++#[warn(clippy::missing_trait_methods)]
++impl Trait for Type {
++ fn required() { /* ... */ }
++
++ fn provided() { /* ... */ }
++}
++```
--- /dev/null
--- /dev/null
++### What it does
++Checks whether partial fields of a struct are public.
++
++Either make all fields of a type public, or make none of them public
++
++### Why is this bad?
++Most types should either be:
++* Abstract data types: complex objects with opaque implementation which guard
++interior invariants and expose intentionally limited API to the outside world.
++* Data: relatively simple objects which group a bunch of related attributes together.
++
++### Example
++```
++pub struct Color {
++ pub r: u8,
++ pub g: u8,
++ b: u8,
++}
++```
++Use instead:
++```
++pub struct Color {
++ pub r: u8,
++ pub g: u8,
++ pub b: u8,
++}
++```
--- /dev/null
--- /dev/null
++### What it does
++Detects [formatting parameters] that have no effect on the output of
++`format!()`, `println!()` or similar macros.
++
++### Why is this bad?
++Shorter format specifiers are easier to read, it may also indicate that
++an expected formatting operation such as adding padding isn't happening.
++
++### Example
++```
++println!("{:.}", 1.0);
++
++println!("not padded: {:5}", format_args!("..."));
++```
++Use instead:
++```
++println!("{}", 1.0);
++
++println!("not padded: {}", format_args!("..."));
++// OR
++println!("padded: {:5}", format!("..."));
++```
++
++[formatting parameters]: https://doc.rust-lang.org/std/fmt/index.html#formatting-parameters
--- /dev/null
- let cargo_content = fs::read(&cargo_toml_path)?;
+#![feature(test)] // compiletest_rs requires this attribute
+#![feature(once_cell)]
+#![feature(is_sorted)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use compiletest_rs as compiletest;
+use compiletest_rs::common::Mode as TestMode;
+
+use std::collections::HashMap;
+use std::env::{self, remove_var, set_var, var_os};
+use std::ffi::{OsStr, OsString};
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
+use test_utils::IS_RUSTC_TEST_SUITE;
+
+mod test_utils;
+
+// whether to run internal tests or not
+const RUN_INTERNAL_TESTS: bool = cfg!(feature = "internal");
+
+/// All crates used in UI tests are listed here
+static TEST_DEPENDENCIES: &[&str] = &[
+ "clippy_lints",
+ "clippy_utils",
+ "derive_new",
+ "futures",
+ "if_chain",
+ "itertools",
+ "quote",
+ "regex",
+ "serde",
+ "serde_derive",
+ "syn",
+ "tokio",
+ "parking_lot",
+ "rustc_semver",
+];
+
+// Test dependencies may need an `extern crate` here to ensure that they show up
+// in the depinfo file (otherwise cargo thinks they are unused)
+#[allow(unused_extern_crates)]
+extern crate clippy_lints;
+#[allow(unused_extern_crates)]
+extern crate clippy_utils;
+#[allow(unused_extern_crates)]
+extern crate derive_new;
+#[allow(unused_extern_crates)]
+extern crate futures;
+#[allow(unused_extern_crates)]
+extern crate if_chain;
+#[allow(unused_extern_crates)]
+extern crate itertools;
+#[allow(unused_extern_crates)]
+extern crate parking_lot;
+#[allow(unused_extern_crates)]
+extern crate quote;
+#[allow(unused_extern_crates)]
+extern crate rustc_semver;
+#[allow(unused_extern_crates)]
+extern crate syn;
+#[allow(unused_extern_crates)]
+extern crate tokio;
+
+/// Produces a string with an `--extern` flag for all UI test crate
+/// dependencies.
+///
+/// The dependency files are located by parsing the depinfo file for this test
+/// module. This assumes the `-Z binary-dep-depinfo` flag is enabled. All test
+/// dependencies must be added to Cargo.toml at the project root. Test
+/// dependencies that are not *directly* used by this test module require an
+/// `extern crate` declaration.
+static EXTERN_FLAGS: LazyLock<String> = LazyLock::new(|| {
+ let current_exe_depinfo = {
+ let mut path = env::current_exe().unwrap();
+ path.set_extension("d");
+ fs::read_to_string(path).unwrap()
+ };
+ let mut crates: HashMap<&str, &str> = HashMap::with_capacity(TEST_DEPENDENCIES.len());
+ for line in current_exe_depinfo.lines() {
+ // each dependency is expected to have a Makefile rule like `/path/to/crate-hash.rlib:`
+ let parse_name_path = || {
+ if line.starts_with(char::is_whitespace) {
+ return None;
+ }
+ let path_str = line.strip_suffix(':')?;
+ let path = Path::new(path_str);
+ if !matches!(path.extension()?.to_str()?, "rlib" | "so" | "dylib" | "dll") {
+ return None;
+ }
+ let (name, _hash) = path.file_stem()?.to_str()?.rsplit_once('-')?;
+ // the "lib" prefix is not present for dll files
+ let name = name.strip_prefix("lib").unwrap_or(name);
+ Some((name, path_str))
+ };
+ if let Some((name, path)) = parse_name_path() {
+ if TEST_DEPENDENCIES.contains(&name) {
+ // A dependency may be listed twice if it is available in sysroot,
+ // and the sysroot dependencies are listed first. As of the writing,
+ // this only seems to apply to if_chain.
+ crates.insert(name, path);
+ }
+ }
+ }
+ let not_found: Vec<&str> = TEST_DEPENDENCIES
+ .iter()
+ .copied()
+ .filter(|n| !crates.contains_key(n))
+ .collect();
+ assert!(
+ not_found.is_empty(),
+ "dependencies not found in depinfo: {not_found:?}\n\
+ help: Make sure the `-Z binary-dep-depinfo` rust flag is enabled\n\
+ help: Try adding to dev-dependencies in Cargo.toml\n\
+ help: Be sure to also add `extern crate ...;` to tests/compile-test.rs",
+ );
+ crates
+ .into_iter()
+ .map(|(name, path)| format!(" --extern {name}={path}"))
+ .collect()
+});
+
+fn base_config(test_dir: &str) -> compiletest::Config {
+ let mut config = compiletest::Config {
+ edition: Some("2021".into()),
+ mode: TestMode::Ui,
+ ..Default::default()
+ };
+
+ if let Ok(filters) = env::var("TESTNAME") {
+ config.filters = filters.split(',').map(ToString::to_string).collect();
+ }
+
+ if let Some(path) = option_env!("RUSTC_LIB_PATH") {
+ let path = PathBuf::from(path);
+ config.run_lib_path = path.clone();
+ config.compile_lib_path = path;
+ }
+ let current_exe_path = env::current_exe().unwrap();
+ let deps_path = current_exe_path.parent().unwrap();
+ let profile_path = deps_path.parent().unwrap();
+
+ // Using `-L dependency={}` enforces that external dependencies are added with `--extern`.
+ // This is valuable because a) it allows us to monitor what external dependencies are used
+ // and b) it ensures that conflicting rlibs are resolved properly.
+ let host_libs = option_env!("HOST_LIBS")
+ .map(|p| format!(" -L dependency={}", Path::new(p).join("deps").display()))
+ .unwrap_or_default();
+ config.target_rustcflags = Some(format!(
+ "--emit=metadata -Dwarnings -Zui-testing -L dependency={}{host_libs}{}",
+ deps_path.display(),
+ &*EXTERN_FLAGS,
+ ));
+
+ config.src_base = Path::new("tests").join(test_dir);
+ config.build_base = profile_path.join("test").join(test_dir);
+ config.rustc_path = profile_path.join(if cfg!(windows) {
+ "clippy-driver.exe"
+ } else {
+ "clippy-driver"
+ });
+ config
+}
+
+fn run_ui() {
+ let mut config = base_config("ui");
+ config.rustfix_coverage = true;
+ // use tests/clippy.toml
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", fs::canonicalize("tests").unwrap());
+ let _threads = VarGuard::set(
+ "RUST_TEST_THREADS",
+ // if RUST_TEST_THREADS is set, adhere to it, otherwise override it
+ env::var("RUST_TEST_THREADS").unwrap_or_else(|_| {
+ std::thread::available_parallelism()
+ .map_or(1, std::num::NonZeroUsize::get)
+ .to_string()
+ }),
+ );
+ compiletest::run_tests(&config);
+ check_rustfix_coverage();
+}
+
+fn run_internal_tests() {
+ // only run internal tests with the internal-tests feature
+ if !RUN_INTERNAL_TESTS {
+ return;
+ }
+ let config = base_config("ui-internal");
+ compiletest::run_tests(&config);
+}
+
+fn run_ui_toml() {
+ fn run_tests(config: &compiletest::Config, mut tests: Vec<tester::TestDescAndFn>) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+ let dir_path = dir.path();
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", &dir_path);
+ for file in fs::read_dir(&dir_path)? {
+ let file = file?;
+ let file_path = file.path();
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+ if file_path.extension() != Some(OsStr::new("rs")) {
+ continue;
+ }
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: dir_path.file_name().unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ Ok(result)
+ }
+
+ let mut config = base_config("ui-toml");
+ config.src_base = config.src_base.canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(&config);
+
+ let res = run_tests(&config, tests);
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {e:?}");
+ },
+ }
+}
+
+fn run_ui_cargo() {
+ fn run_tests(
+ config: &compiletest::Config,
+ filters: &[String],
+ mut tests: Vec<tester::TestDescAndFn>,
+ ) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Use the filter if provided
+ let dir_path = dir.path();
+ for filter in filters {
+ if !dir_path.ends_with(filter) {
+ continue;
+ }
+ }
+
+ for case in fs::read_dir(&dir_path)? {
+ let case = case?;
+ if !case.file_type()?.is_dir() {
+ continue;
+ }
+
+ let src_path = case.path().join("src");
+
+ // When switching between branches, if the previous branch had a test
+ // that the current branch does not have, the directory is not removed
+ // because an ignored Cargo.lock file exists.
+ if !src_path.exists() {
+ continue;
+ }
+
+ env::set_current_dir(&src_path)?;
+
+ let cargo_toml_path = case.path().join("Cargo.toml");
++ let cargo_content = fs::read(cargo_toml_path)?;
+ let cargo_parsed: toml::Value = toml::from_str(
+ std::str::from_utf8(&cargo_content).expect("`Cargo.toml` is not a valid utf-8 file!"),
+ )
+ .expect("Can't parse `Cargo.toml`");
+
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", case.path());
+ let _h = VarGuard::set(
+ "CARGO_PKG_RUST_VERSION",
+ cargo_parsed
+ .get("package")
+ .and_then(|p| p.get("rust-version"))
+ .and_then(toml::Value::as_str)
+ .unwrap_or(""),
+ );
+
+ for file in fs::read_dir(&src_path)? {
+ let file = file?;
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Search for the main file to avoid running a test for each file in the project
+ let file_path = file.path();
+ match file_path.file_name().and_then(OsStr::to_str) {
+ Some("main.rs") => {},
+ _ => continue,
+ }
+ let _g = VarGuard::set("CLIPPY_CONF_DIR", case.path());
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: src_path.strip_prefix(&config.src_base).unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ }
+ Ok(result)
+ }
+
+ if IS_RUSTC_TEST_SUITE {
+ return;
+ }
+
+ let mut config = base_config("ui-cargo");
+ config.src_base = config.src_base.canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(&config);
+
+ let current_dir = env::current_dir().unwrap();
+ let res = run_tests(&config, &config.filters, tests);
+ env::set_current_dir(current_dir).unwrap();
+
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {e:?}");
+ },
+ }
+}
+
+#[test]
+fn compile_test() {
+ set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
+ run_ui();
+ run_ui_toml();
+ run_ui_cargo();
+ run_internal_tests();
+}
+
+const RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS: &[&str] = &[
+ "assign_ops2.rs",
+ "borrow_deref_ref_unfixable.rs",
+ "cast_size_32bit.rs",
+ "char_lit_as_u8.rs",
+ "cmp_owned/without_suggestion.rs",
+ "dbg_macro.rs",
+ "deref_addrof_double_trigger.rs",
+ "doc/unbalanced_ticks.rs",
+ "eprint_with_newline.rs",
+ "explicit_counter_loop.rs",
+ "iter_skip_next_unfixable.rs",
+ "let_and_return.rs",
+ "literals.rs",
+ "map_flatten.rs",
+ "map_unwrap_or.rs",
+ "match_bool.rs",
+ "mem_replace_macro.rs",
+ "needless_arbitrary_self_type_unfixable.rs",
+ "needless_borrow_pat.rs",
+ "needless_for_each_unfixable.rs",
+ "nonminimal_bool.rs",
+ "print_literal.rs",
+ "print_with_newline.rs",
+ "redundant_static_lifetimes_multiple.rs",
+ "ref_binding_to_reference.rs",
+ "repl_uninit.rs",
+ "result_map_unit_fn_unfixable.rs",
+ "search_is_some.rs",
+ "single_component_path_imports_nested_first.rs",
+ "string_add.rs",
+ "suspicious_to_owned.rs",
+ "toplevel_ref_arg_non_rustfix.rs",
+ "unit_arg.rs",
+ "unnecessary_clone.rs",
+ "unnecessary_lazy_eval_unfixable.rs",
+ "write_literal.rs",
+ "write_literal_2.rs",
+ "write_with_newline.rs",
+];
+
+fn check_rustfix_coverage() {
+ let missing_coverage_path = Path::new("debug/test/ui/rustfix_missing_coverage.txt");
+ let missing_coverage_path = if let Ok(target_dir) = std::env::var("CARGO_TARGET_DIR") {
+ PathBuf::from(target_dir).join(missing_coverage_path)
+ } else {
+ missing_coverage_path.to_path_buf()
+ };
+
+ if let Ok(missing_coverage_contents) = std::fs::read_to_string(missing_coverage_path) {
+ assert!(RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS.iter().is_sorted_by_key(Path::new));
+
+ for rs_file in missing_coverage_contents.lines() {
+ let rs_path = Path::new(rs_file);
+ if rs_path.starts_with("tests/ui/crashes") {
+ continue;
+ }
+ assert!(rs_path.starts_with("tests/ui/"), "{rs_file:?}");
+ let filename = rs_path.strip_prefix("tests/ui/").unwrap();
+ assert!(
+ RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS
+ .binary_search_by_key(&filename, Path::new)
+ .is_ok(),
+ "`{rs_file}` runs `MachineApplicable` diagnostics but is missing a `run-rustfix` annotation. \
+ Please either add `// run-rustfix` at the top of the file or add the file to \
+ `RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS` in `tests/compile-test.rs`.",
+ );
+ }
+ }
+}
+
+#[test]
+fn rustfix_coverage_known_exceptions_accuracy() {
+ for filename in RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS {
+ let rs_path = Path::new("tests/ui").join(filename);
+ assert!(
+ rs_path.exists(),
+ "`{}` does not exist",
+ rs_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+ );
+ let fixed_path = rs_path.with_extension("fixed");
+ assert!(
+ !fixed_path.exists(),
+ "`{}` exists",
+ fixed_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+ );
+ }
+}
+
+#[test]
+fn ui_cargo_toml_metadata() {
+ let ui_cargo_path = Path::new("tests/ui-cargo");
+ let cargo_common_metadata_path = ui_cargo_path.join("cargo_common_metadata");
+ let publish_exceptions =
+ ["fail_publish", "fail_publish_true", "pass_publish_empty"].map(|path| cargo_common_metadata_path.join(path));
+
+ for entry in walkdir::WalkDir::new(ui_cargo_path) {
+ let entry = entry.unwrap();
+ let path = entry.path();
+ if path.file_name() != Some(OsStr::new("Cargo.toml")) {
+ continue;
+ }
+
+ let toml = fs::read_to_string(path).unwrap().parse::<toml::Value>().unwrap();
+
+ let package = toml.as_table().unwrap().get("package").unwrap().as_table().unwrap();
+
+ let name = package.get("name").unwrap().as_str().unwrap().replace('-', "_");
+ assert!(
+ path.parent()
+ .unwrap()
+ .components()
+ .map(|component| component.as_os_str().to_string_lossy().replace('-', "_"))
+ .any(|s| *s == name)
+ || path.starts_with(&cargo_common_metadata_path),
+ "{path:?} has incorrect package name"
+ );
+
+ let publish = package.get("publish").and_then(toml::Value::as_bool).unwrap_or(true);
+ assert!(
+ !publish || publish_exceptions.contains(&path.parent().unwrap().to_path_buf()),
+ "{path:?} lacks `publish = false`"
+ );
+ }
+}
+
+/// Restores an env var on drop
+#[must_use]
+struct VarGuard {
+ key: &'static str,
+ value: Option<OsString>,
+}
+
+impl VarGuard {
+ fn set(key: &'static str, val: impl AsRef<OsStr>) -> Self {
+ let value = var_os(key);
+ set_var(key, val);
+ Self { key, value }
+ }
+}
+
+impl Drop for VarGuard {
+ fn drop(&mut self) {
+ match self.value.as_deref() {
+ None => remove_var(self.key),
+ Some(value) => set_var(self.key, value),
+ }
+ }
+}
--- /dev/null
- for package in &["", "clippy_dev", "clippy_lints", "clippy_utils", "rustc_tools_util"] {
+//! This test is a part of quality control and makes clippy eat what it produces. Awesome lints and
+//! long error messages
+//!
+//! See [Eating your own dog food](https://en.wikipedia.org/wiki/Eating_your_own_dog_food) for context
+
+#![feature(once_cell)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use std::path::PathBuf;
+use std::process::Command;
+use test_utils::IS_RUSTC_TEST_SUITE;
+
+mod test_utils;
+
+#[test]
+fn dogfood_clippy() {
+ if IS_RUSTC_TEST_SUITE {
+ return;
+ }
+
+ // "" is the root package
++ for package in &[
++ "",
++ "clippy_dev",
++ "clippy_lints",
++ "clippy_utils",
++ "lintcheck",
++ "rustc_tools_util",
++ ] {
+ run_clippy_for_package(package, &["-D", "clippy::all", "-D", "clippy::pedantic"]);
+ }
+}
+
+#[test]
+#[ignore]
+#[cfg(feature = "internal")]
+fn run_metadata_collection_lint() {
+ use std::fs::File;
+ use std::time::SystemTime;
+
+ // Setup for validation
+ let metadata_output_path = PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("util/gh-pages/lints.json");
+ let start_time = SystemTime::now();
+
+ // Run collection as is
+ std::env::set_var("ENABLE_METADATA_COLLECTION", "1");
+ run_clippy_for_package("clippy_lints", &["-A", "unfulfilled_lint_expectations"]);
+
+ // Check if cargo caching got in the way
+ if let Ok(file) = File::open(metadata_output_path) {
+ if let Ok(metadata) = file.metadata() {
+ if let Ok(last_modification) = metadata.modified() {
+ if last_modification > start_time {
+ // The output file has been modified. Most likely by a hungry
+ // metadata collection monster. So We'll return.
+ return;
+ }
+ }
+ }
+ }
+
+ // Force cargo to invalidate the caches
+ filetime::set_file_mtime(
+ PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("clippy_lints/src/lib.rs"),
+ filetime::FileTime::now(),
+ )
+ .unwrap();
+
+ // Running the collection again
+ run_clippy_for_package("clippy_lints", &["-A", "unfulfilled_lint_expectations"]);
+}
+
+fn run_clippy_for_package(project: &str, args: &[&str]) {
+ let root_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+
+ let mut command = Command::new(&*test_utils::CARGO_CLIPPY_PATH);
+
+ command
+ .current_dir(root_dir.join(project))
+ .env("CARGO_INCREMENTAL", "0")
+ .arg("clippy")
+ .arg("--all-targets")
+ .arg("--all-features");
+
+ if let Ok(dogfood_args) = std::env::var("__CLIPPY_DOGFOOD_ARGS") {
+ for arg in dogfood_args.split_whitespace() {
+ command.arg(arg);
+ }
+ }
+
+ command.arg("--").args(args);
+ command.arg("-Cdebuginfo=0"); // disable debuginfo to generate less data in the target dir
+
+ if cfg!(feature = "internal") {
+ // internal lints only exist if we build with the internal feature
+ command.args(["-D", "clippy::internal"]);
+ } else {
+ // running a clippy built without internal lints on the clippy source
+ // that contains e.g. `allow(clippy::invalid_paths)`
+ command.args(["-A", "unknown_lints"]);
+ }
+
+ let output = command.output().unwrap();
+
+ println!("status: {}", output.status);
+ println!("stdout: {}", String::from_utf8_lossy(&output.stdout));
+ println!("stderr: {}", String::from_utf8_lossy(&output.stderr));
+
+ assert!(output.status.success());
+}
--- /dev/null
- thread 'rustc' panicked at 'Would you like some help with that?', clippy_lints/src/utils/internal_lints.rs
++thread 'rustc' panicked at 'Would you like some help with that?', clippy_lints/src/utils/internal_lints/produce_ice.rs:28:9
+note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+
+error: internal compiler error: unexpected panic
+
+note: the compiler unexpectedly panicked. this is a bug.
+
+note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new
+
+note: Clippy version: foo
+
+query stack during panic:
+end of query stack
--- /dev/null
- #![allow(clippy::missing_clippy_version_attribute)]
+#![warn(clippy::internal)]
++#![allow(clippy::missing_clippy_version_attribute, clippy::unnecessary_def_path)]
+
+mod paths {
+ // Good path
+ pub const ANY_TRAIT: [&str; 3] = ["std", "any", "Any"];
+
+ // Path to method on inherent impl of a primitive type
+ pub const F32_EPSILON: [&str; 4] = ["core", "f32", "<impl f32>", "EPSILON"];
+
+ // Path to method on inherent impl
+ pub const ARC_PTR_EQ: [&str; 4] = ["alloc", "sync", "Arc", "ptr_eq"];
+
+ // Path with empty segment
+ pub const TRANSMUTE: [&str; 4] = ["core", "intrinsics", "", "transmute"];
+
+ // Path with bad crate
+ pub const BAD_CRATE_PATH: [&str; 2] = ["bad", "path"];
+
+ // Path with bad module
+ pub const BAD_MOD_PATH: [&str; 2] = ["std", "xxx"];
+
+ // Path to method on an enum inherent impl
+ pub const OPTION_IS_SOME: [&str; 4] = ["core", "option", "Option", "is_some"];
+}
+
+fn main() {}
--- /dev/null
- #[allow(unused)]
+// run-rustfix
+// aux-build:paths.rs
+#![deny(clippy::internal)]
+#![feature(rustc_private)]
+
+extern crate clippy_utils;
+extern crate paths;
+extern crate rustc_hir;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_span;
+
+#[allow(unused)]
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item, match_type};
+#[allow(unused)]
+use clippy_utils::{
+ is_expr_path_def_path, is_path_diagnostic_item, is_res_diagnostic_ctor, is_res_lang_ctor, is_trait_method,
+ match_def_path, match_trait_method, path_res,
+};
+
+#[allow(unused)]
+use rustc_hir::LangItem;
+#[allow(unused)]
+use rustc_span::sym;
+
+use rustc_hir::def_id::DefId;
+use rustc_hir::Expr;
+use rustc_lint::LateContext;
+use rustc_middle::ty::Ty;
+
- #[allow(unused)]
++#[allow(unused, clippy::unnecessary_def_path)]
+static OPTION: [&str; 3] = ["core", "option", "Option"];
- #[allow(unused)]
++#[allow(unused, clippy::unnecessary_def_path)]
+const RESULT: &[&str] = &["core", "result", "Result"];
+
+fn _f<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, did: DefId, expr: &Expr<'_>) {
+ let _ = is_type_diagnostic_item(cx, ty, sym::Option);
+ let _ = is_type_diagnostic_item(cx, ty, sym::Result);
+ let _ = is_type_diagnostic_item(cx, ty, sym::Result);
+
++ #[allow(unused, clippy::unnecessary_def_path)]
+ let rc_path = &["alloc", "rc", "Rc"];
+ let _ = is_type_diagnostic_item(cx, ty, sym::Rc);
+
+ let _ = is_type_diagnostic_item(cx, ty, sym::Option);
+ let _ = is_type_diagnostic_item(cx, ty, sym::Result);
+
+ let _ = is_type_lang_item(cx, ty, LangItem::OwnedBox);
+ let _ = is_type_diagnostic_item(cx, ty, sym::maybe_uninit_uninit);
+
+ let _ = cx.tcx.lang_items().require(LangItem::OwnedBox).ok() == Some(did);
+ let _ = cx.tcx.is_diagnostic_item(sym::Option, did);
+ let _ = cx.tcx.lang_items().require(LangItem::OptionSome).ok() == Some(did);
+
+ let _ = is_trait_method(cx, expr, sym::AsRef);
+
+ let _ = is_path_diagnostic_item(cx, expr, sym::Option);
+ let _ = path_res(cx, expr).opt_def_id().map_or(false, |id| cx.tcx.lang_items().require(LangItem::IteratorNext).ok() == Some(id));
+ let _ = is_res_lang_ctor(cx, path_res(cx, expr), LangItem::OptionSome);
+}
+
+fn main() {}
--- /dev/null
- #[allow(unused)]
+// run-rustfix
+// aux-build:paths.rs
+#![deny(clippy::internal)]
+#![feature(rustc_private)]
+
+extern crate clippy_utils;
+extern crate paths;
+extern crate rustc_hir;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_span;
+
+#[allow(unused)]
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item, match_type};
+#[allow(unused)]
+use clippy_utils::{
+ is_expr_path_def_path, is_path_diagnostic_item, is_res_diagnostic_ctor, is_res_lang_ctor, is_trait_method,
+ match_def_path, match_trait_method, path_res,
+};
+
+#[allow(unused)]
+use rustc_hir::LangItem;
+#[allow(unused)]
+use rustc_span::sym;
+
+use rustc_hir::def_id::DefId;
+use rustc_hir::Expr;
+use rustc_lint::LateContext;
+use rustc_middle::ty::Ty;
+
- #[allow(unused)]
++#[allow(unused, clippy::unnecessary_def_path)]
+static OPTION: [&str; 3] = ["core", "option", "Option"];
- #[allow(unused)]
++#[allow(unused, clippy::unnecessary_def_path)]
+const RESULT: &[&str] = &["core", "result", "Result"];
+
+fn _f<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, did: DefId, expr: &Expr<'_>) {
+ let _ = match_type(cx, ty, &OPTION);
+ let _ = match_type(cx, ty, RESULT);
+ let _ = match_type(cx, ty, &["core", "result", "Result"]);
+
++ #[allow(unused, clippy::unnecessary_def_path)]
+ let rc_path = &["alloc", "rc", "Rc"];
+ let _ = clippy_utils::ty::match_type(cx, ty, rc_path);
+
+ let _ = match_type(cx, ty, &paths::OPTION);
+ let _ = match_type(cx, ty, paths::RESULT);
+
+ let _ = match_type(cx, ty, &["alloc", "boxed", "Box"]);
+ let _ = match_type(cx, ty, &["core", "mem", "maybe_uninit", "MaybeUninit", "uninit"]);
+
+ let _ = match_def_path(cx, did, &["alloc", "boxed", "Box"]);
+ let _ = match_def_path(cx, did, &["core", "option", "Option"]);
+ let _ = match_def_path(cx, did, &["core", "option", "Option", "Some"]);
+
+ let _ = match_trait_method(cx, expr, &["core", "convert", "AsRef"]);
+
+ let _ = is_expr_path_def_path(cx, expr, &["core", "option", "Option"]);
+ let _ = is_expr_path_def_path(cx, expr, &["core", "iter", "traits", "Iterator", "next"]);
+ let _ = is_expr_path_def_path(cx, expr, &["core", "option", "Option", "Some"]);
+}
+
+fn main() {}
--- /dev/null
--- /dev/null
++#![feature(rustc_private)]
++#![allow(unused)]
++#![warn(clippy::unnecessary_def_path)]
++
++extern crate rustc_hir;
++
++use rustc_hir::LangItem;
++
++fn main() {
++ const DEREF_TRAIT: [&str; 4] = ["core", "ops", "deref", "Deref"];
++ const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
++ const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
++
++ // Don't lint, not yet a diagnostic or language item
++ const DEREF_MUT_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "DerefMut", "deref_mut"];
++}
--- /dev/null
--- /dev/null
++error: hardcoded path to a language item
++ --> $DIR/unnecessary_def_path_hardcoded_path.rs:11:40
++ |
++LL | const DEREF_MUT_TRAIT: [&str; 4] = ["core", "ops", "deref", "DerefMut"];
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: convert all references to use `LangItem::DerefMut`
++ = note: `-D clippy::unnecessary-def-path` implied by `-D warnings`
++
++error: hardcoded path to a diagnostic item
++ --> $DIR/unnecessary_def_path_hardcoded_path.rs:12:43
++ |
++LL | const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: convert all references to use `sym::deref_method`
++
++error: hardcoded path to a diagnostic item
++ --> $DIR/unnecessary_def_path_hardcoded_path.rs:10:36
++ |
++LL | const DEREF_TRAIT: [&str; 4] = ["core", "ops", "deref", "Deref"];
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: convert all references to use `sym::Deref`
++
++error: aborting due to 3 previous errors
++
--- /dev/null
--- /dev/null
++#![allow(unused)]
++#![warn(clippy::as_ptr_cast_mut)]
++#![allow(clippy::wrong_self_convention)]
++
++struct MutPtrWrapper(Vec<u8>);
++impl MutPtrWrapper {
++ fn as_ptr(&mut self) -> *const u8 {
++ self.0.as_mut_ptr() as *const u8
++ }
++}
++
++struct Covariant<T>(*const T);
++impl<T> Covariant<T> {
++ fn as_ptr(self) -> *const T {
++ self.0
++ }
++}
++
++fn main() {
++ let mut string = String::new();
++ let _ = string.as_ptr() as *mut u8;
++ let _: *mut i8 = string.as_ptr() as *mut _;
++ let _ = string.as_ptr() as *const i8;
++ let _ = string.as_mut_ptr();
++ let _ = string.as_mut_ptr() as *mut u8;
++ let _ = string.as_mut_ptr() as *const u8;
++
++ let nn = std::ptr::NonNull::new(4 as *mut u8).unwrap();
++ let _ = nn.as_ptr() as *mut u8;
++
++ let mut wrap = MutPtrWrapper(Vec::new());
++ let _ = wrap.as_ptr() as *mut u8;
++
++ let mut local = 4;
++ let ref_with_write_perm = Covariant(std::ptr::addr_of_mut!(local) as *const _);
++ let _ = ref_with_write_perm.as_ptr() as *mut u8;
++}
--- /dev/null
--- /dev/null
++error: casting the result of `as_ptr` to *mut u8
++ --> $DIR/as_ptr_cast_mut.rs:21:13
++ |
++LL | let _ = string.as_ptr() as *mut u8;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `string.as_mut_ptr()`
++ |
++ = note: `-D clippy::as-ptr-cast-mut` implied by `-D warnings`
++
++error: casting the result of `as_ptr` to *mut i8
++ --> $DIR/as_ptr_cast_mut.rs:22:22
++ |
++LL | let _: *mut i8 = string.as_ptr() as *mut _;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `string.as_mut_ptr()`
++
++error: aborting due to 2 previous errors
++
--- /dev/null
- if_chain! {
- if let StmtKind::Local(local) = stmt.kind;
- if let Some(init) = local.init;
- if let ExprKind::Cast(expr, cast_ty) = init.kind;
- if let TyKind::Path(ref qpath) = cast_ty.kind;
- if match_qpath(qpath, &["char"]);
- if let ExprKind::Lit(ref lit) = expr.kind;
- if let LitKind::Int(69, LitIntType::Unsuffixed) = lit.node;
- if let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind;
- if name.as_str() == "x";
- then {
- // report your lint here
- }
++if let StmtKind::Local(local) = stmt.kind
++ && let Some(init) = local.init
++ && let ExprKind::Cast(expr, cast_ty) = init.kind
++ && let TyKind::Path(ref qpath) = cast_ty.kind
++ && match_qpath(qpath, &["char"])
++ && let ExprKind::Lit(ref lit) = expr.kind
++ && let LitKind::Int(69, LitIntType::Unsuffixed) = lit.node
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind
++ && name.as_str() == "x"
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let ExprKind::Block(block, None) = expr.kind;
- if block.stmts.len() == 3;
- if let StmtKind::Local(local) = block.stmts[0].kind;
- if let Some(init) = local.init;
- if let ExprKind::Lit(ref lit) = init.kind;
- if let LitKind::Int(42, LitIntType::Signed(IntTy::I32)) = lit.node;
- if let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind;
- if name.as_str() == "x";
- if let StmtKind::Local(local1) = block.stmts[1].kind;
- if let Some(init1) = local1.init;
- if let ExprKind::Lit(ref lit1) = init1.kind;
- if let LitKind::Float(_, LitFloatType::Suffixed(FloatTy::F32)) = lit1.node;
- if let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local1.pat.kind;
- if name1.as_str() == "_t";
- if let StmtKind::Semi(e) = block.stmts[2].kind;
- if let ExprKind::Unary(UnOp::Neg, inner) = e.kind;
- if let ExprKind::Path(ref qpath) = inner.kind;
- if match_qpath(qpath, &["x"]);
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let ExprKind::Block(block, None) = expr.kind
++ && block.stmts.len() == 3
++ && let StmtKind::Local(local) = block.stmts[0].kind
++ && let Some(init) = local.init
++ && let ExprKind::Lit(ref lit) = init.kind
++ && let LitKind::Int(42, LitIntType::Signed(IntTy::I32)) = lit.node
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind
++ && name.as_str() == "x"
++ && let StmtKind::Local(local1) = block.stmts[1].kind
++ && let Some(init1) = local1.init
++ && let ExprKind::Lit(ref lit1) = init1.kind
++ && let LitKind::Float(_, LitFloatType::Suffixed(FloatTy::F32)) = lit1.node
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local1.pat.kind
++ && name1.as_str() == "_t"
++ && let StmtKind::Semi(e) = block.stmts[2].kind
++ && let ExprKind::Unary(UnOp::Neg, inner) = e.kind
++ && let ExprKind::Path(ref qpath) = inner.kind
++ && match_qpath(qpath, &["x"])
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let ExprKind::Block(block, None) = expr.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Local(local) = block.stmts[0].kind;
- if let Some(init) = local.init;
- if let ExprKind::Call(func, args) = init.kind;
- if let ExprKind::Path(ref qpath) = func.kind;
- if match_qpath(qpath, &["String", "new"]);
- if args.is_empty();
- if let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind;
- if name.as_str() == "expr";
- if let Some(trailing_expr) = block.expr;
- if let ExprKind::Call(func1, args1) = trailing_expr.kind;
- if let ExprKind::Path(ref qpath1) = func1.kind;
- if match_qpath(qpath1, &["drop"]);
- if args1.len() == 1;
- if let ExprKind::Path(ref qpath2) = args1[0].kind;
- if match_qpath(qpath2, &["expr"]);
- then {
- // report your lint here
- }
++if let ExprKind::Block(block, None) = expr.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Local(local) = block.stmts[0].kind
++ && let Some(init) = local.init
++ && let ExprKind::Call(func, args) = init.kind
++ && let ExprKind::Path(ref qpath) = func.kind
++ && match_qpath(qpath, &["String", "new"])
++ && args.is_empty()
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local.pat.kind
++ && name.as_str() == "expr"
++ && let Some(trailing_expr) = block.expr
++ && let ExprKind::Call(func1, args1) = trailing_expr.kind
++ && let ExprKind::Path(ref qpath1) = func1.kind
++ && match_qpath(qpath1, &["drop"])
++ && args1.len() == 1
++ && let ExprKind::Path(ref qpath2) = args1[0].kind
++ && match_qpath(qpath2, &["expr"])
++{
++ // report your lint here
+}
- if_chain! {
- if let ExprKind::Closure(CaptureBy::Value, fn_decl, body_id, _, None) = expr.kind;
- if let FnRetTy::DefaultReturn(_) = fn_decl.output;
- let expr1 = &cx.tcx.hir().body(body_id).value;
- if let ExprKind::Call(func, args) = expr1.kind;
- if let ExprKind::Path(ref qpath) = func.kind;
- if matches!(qpath, QPath::LangItem(LangItem::FromGenerator, _));
- if args.len() == 1;
- if let ExprKind::Closure(CaptureBy::Value, fn_decl1, body_id1, _, Some(Movability::Static)) = args[0].kind;
- if let FnRetTy::DefaultReturn(_) = fn_decl1.output;
- let expr2 = &cx.tcx.hir().body(body_id1).value;
- if let ExprKind::Block(block, None) = expr2.kind;
- if block.stmts.is_empty();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let ExprKind::Closure(CaptureBy::Value, fn_decl, body_id, _, None) = expr.kind
++ && let FnRetTy::DefaultReturn(_) = fn_decl.output
++ && expr1 = &cx.tcx.hir().body(body_id).value
++ && let ExprKind::Call(func, args) = expr1.kind
++ && let ExprKind::Path(ref qpath) = func.kind
++ && matches!(qpath, QPath::LangItem(LangItem::FromGenerator, _))
++ && args.len() == 1
++ && let ExprKind::Closure(CaptureBy::Value, fn_decl1, body_id1, _, Some(Movability::Static)) = args[0].kind
++ && let FnRetTy::DefaultReturn(_) = fn_decl1.output
++ && expr2 = &cx.tcx.hir().body(body_id1).value
++ && let ExprKind::Block(block, None) = expr2.kind
++ && block.stmts.is_empty()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let StmtKind::Local(local) = stmt.kind;
- if let Some(init) = local.init;
- if let ExprKind::Call(func, args) = init.kind;
- if let ExprKind::Path(ref qpath) = func.kind;
- if match_qpath(qpath, &["{{root}}", "std", "cmp", "min"]);
- if args.len() == 2;
- if let ExprKind::Lit(ref lit) = args[0].kind;
- if let LitKind::Int(3, LitIntType::Unsuffixed) = lit.node;
- if let ExprKind::Lit(ref lit1) = args[1].kind;
- if let LitKind::Int(4, LitIntType::Unsuffixed) = lit1.node;
- if let PatKind::Wild = local.pat.kind;
- then {
- // report your lint here
- }
++if let StmtKind::Local(local) = stmt.kind
++ && let Some(init) = local.init
++ && let ExprKind::Call(func, args) = init.kind
++ && let ExprKind::Path(ref qpath) = func.kind
++ && match_qpath(qpath, &["{{root}}", "std", "cmp", "min"])
++ && args.len() == 2
++ && let ExprKind::Lit(ref lit) = args[0].kind
++ && let LitKind::Int(3, LitIntType::Unsuffixed) = lit.node
++ && let ExprKind::Lit(ref lit1) = args[1].kind
++ && let LitKind::Int(4, LitIntType::Unsuffixed) = lit1.node
++ && let PatKind::Wild = local.pat.kind
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let StmtKind::Local(local) = stmt.kind;
- if let Some(init) = local.init;
- if let ExprKind::If(cond, then, Some(else_expr)) = init.kind;
- if let ExprKind::DropTemps(expr) = cond.kind;
- if let ExprKind::Lit(ref lit) = expr.kind;
- if let LitKind::Bool(true) = lit.node;
- if let ExprKind::Block(block, None) = then.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Semi(e) = block.stmts[0].kind;
- if let ExprKind::Binary(op, left, right) = e.kind;
- if BinOpKind::Eq == op.node;
- if let ExprKind::Lit(ref lit1) = left.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node;
- if let ExprKind::Lit(ref lit2) = right.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit2.node;
- if block.expr.is_none();
- if let ExprKind::Block(block1, None) = else_expr.kind;
- if block1.stmts.len() == 1;
- if let StmtKind::Semi(e1) = block1.stmts[0].kind;
- if let ExprKind::Binary(op1, left1, right1) = e1.kind;
- if BinOpKind::Eq == op1.node;
- if let ExprKind::Lit(ref lit3) = left1.kind;
- if let LitKind::Int(2, LitIntType::Unsuffixed) = lit3.node;
- if let ExprKind::Lit(ref lit4) = right1.kind;
- if let LitKind::Int(2, LitIntType::Unsuffixed) = lit4.node;
- if block1.expr.is_none();
- if let PatKind::Wild = local.pat.kind;
- then {
- // report your lint here
- }
++if let StmtKind::Local(local) = stmt.kind
++ && let Some(init) = local.init
++ && let ExprKind::If(cond, then, Some(else_expr)) = init.kind
++ && let ExprKind::DropTemps(expr) = cond.kind
++ && let ExprKind::Lit(ref lit) = expr.kind
++ && let LitKind::Bool(true) = lit.node
++ && let ExprKind::Block(block, None) = then.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Semi(e) = block.stmts[0].kind
++ && let ExprKind::Binary(op, left, right) = e.kind
++ && BinOpKind::Eq == op.node
++ && let ExprKind::Lit(ref lit1) = left.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node
++ && let ExprKind::Lit(ref lit2) = right.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit2.node
++ && block.expr.is_none()
++ && let ExprKind::Block(block1, None) = else_expr.kind
++ && block1.stmts.len() == 1
++ && let StmtKind::Semi(e1) = block1.stmts[0].kind
++ && let ExprKind::Binary(op1, left1, right1) = e1.kind
++ && BinOpKind::Eq == op1.node
++ && let ExprKind::Lit(ref lit3) = left1.kind
++ && let LitKind::Int(2, LitIntType::Unsuffixed) = lit3.node
++ && let ExprKind::Lit(ref lit4) = right1.kind
++ && let LitKind::Int(2, LitIntType::Unsuffixed) = lit4.node
++ && block1.expr.is_none()
++ && let PatKind::Wild = local.pat.kind
++{
++ // report your lint here
+}
- if_chain! {
- if let ExprKind::If(cond, then, Some(else_expr)) = expr.kind;
- if let ExprKind::Let(let_expr) = cond.kind;
- if let PatKind::Lit(lit_expr) = let_expr.pat.kind;
- if let ExprKind::Lit(ref lit) = lit_expr.kind;
- if let LitKind::Bool(true) = lit.node;
- if let ExprKind::Path(ref qpath) = let_expr.init.kind;
- if match_qpath(qpath, &["a"]);
- if let ExprKind::Block(block, None) = then.kind;
- if block.stmts.is_empty();
- if block.expr.is_none();
- if let ExprKind::Block(block1, None) = else_expr.kind;
- if block1.stmts.is_empty();
- if block1.expr.is_none();
- then {
- // report your lint here
- }
++if let ExprKind::If(cond, then, Some(else_expr)) = expr.kind
++ && let ExprKind::Let(let_expr) = cond.kind
++ && let PatKind::Lit(lit_expr) = let_expr.pat.kind
++ && let ExprKind::Lit(ref lit) = lit_expr.kind
++ && let LitKind::Bool(true) = lit.node
++ && let ExprKind::Path(ref qpath) = let_expr.init.kind
++ && match_qpath(qpath, &["a"])
++ && let ExprKind::Block(block, None) = then.kind
++ && block.stmts.is_empty()
++ && block.expr.is_none()
++ && let ExprKind::Block(block1, None) = else_expr.kind
++ && block1.stmts.is_empty()
++ && block1.expr.is_none()
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let StmtKind::Local(local) = stmt.kind;
- if let Some(init) = local.init;
- if let ExprKind::Call(func, args) = init.kind;
- if let ExprKind::Path(ref qpath) = func.kind;
- if match_qpath(qpath, &["std", "mem", "transmute"]);
- if args.len() == 1;
- if let ExprKind::Path(ref qpath1) = args[0].kind;
- if match_qpath(qpath1, &["ZPTR"]);
- if let PatKind::Wild = local.pat.kind;
- then {
- // report your lint here
- }
++if let StmtKind::Local(local) = stmt.kind
++ && let Some(init) = local.init
++ && let ExprKind::Call(func, args) = init.kind
++ && let ExprKind::Path(ref qpath) = func.kind
++ && match_qpath(qpath, &["std", "mem", "transmute"])
++ && args.len() == 1
++ && let ExprKind::Path(ref qpath1) = args[0].kind
++ && match_qpath(qpath1, &["ZPTR"])
++ && let PatKind::Wild = local.pat.kind
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
- if let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = pat.kind;
- if name.as_str() == "y";
- if let ExprKind::Struct(qpath, fields, None) = arg.kind;
- if matches!(qpath, QPath::LangItem(LangItem::Range, _));
- if fields.len() == 2;
- if fields[0].ident.as_str() == "start";
- if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
- if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
- if fields[1].ident.as_str() == "end";
- if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
- if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
- if let ExprKind::Block(block, None) = body.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Local(local) = block.stmts[0].kind;
- if let Some(init) = local.init;
- if let ExprKind::Path(ref qpath1) = init.kind;
- if match_qpath(qpath1, &["y"]);
- if let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local.pat.kind;
- if name1.as_str() == "z";
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr)
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = pat.kind
++ && name.as_str() == "y"
++ && let ExprKind::Struct(qpath, fields, None) = arg.kind
++ && matches!(qpath, QPath::LangItem(LangItem::Range, _))
++ && fields.len() == 2
++ && fields[0].ident.as_str() == "start"
++ && let ExprKind::Lit(ref lit) = fields[0].expr.kind
++ && let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node
++ && fields[1].ident.as_str() == "end"
++ && let ExprKind::Lit(ref lit1) = fields[1].expr.kind
++ && let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node
++ && let ExprKind::Block(block, None) = body.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Local(local) = block.stmts[0].kind
++ && let Some(init) = local.init
++ && let ExprKind::Path(ref qpath1) = init.kind
++ && match_qpath(qpath1, &["y"])
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local.pat.kind
++ && name1.as_str() == "z"
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
- if let PatKind::Wild = pat.kind;
- if let ExprKind::Struct(qpath, fields, None) = arg.kind;
- if matches!(qpath, QPath::LangItem(LangItem::Range, _));
- if fields.len() == 2;
- if fields[0].ident.as_str() == "start";
- if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
- if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
- if fields[1].ident.as_str() == "end";
- if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
- if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
- if let ExprKind::Block(block, None) = body.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Semi(e) = block.stmts[0].kind;
- if let ExprKind::Break(destination, None) = e.kind;
- if destination.label.is_none();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr)
++ && let PatKind::Wild = pat.kind
++ && let ExprKind::Struct(qpath, fields, None) = arg.kind
++ && matches!(qpath, QPath::LangItem(LangItem::Range, _))
++ && fields.len() == 2
++ && fields[0].ident.as_str() == "start"
++ && let ExprKind::Lit(ref lit) = fields[0].expr.kind
++ && let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node
++ && fields[1].ident.as_str() == "end"
++ && let ExprKind::Lit(ref lit1) = fields[1].expr.kind
++ && let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node
++ && let ExprKind::Block(block, None) = body.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Semi(e) = block.stmts[0].kind
++ && let ExprKind::Break(destination, None) = e.kind
++ && destination.label.is_none()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
- if let PatKind::Wild = pat.kind;
- if let ExprKind::Struct(qpath, fields, None) = arg.kind;
- if matches!(qpath, QPath::LangItem(LangItem::Range, _));
- if fields.len() == 2;
- if fields[0].ident.as_str() == "start";
- if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
- if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
- if fields[1].ident.as_str() == "end";
- if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
- if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
- if let ExprKind::Block(block, None) = body.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Semi(e) = block.stmts[0].kind;
- if let ExprKind::Break(destination, None) = e.kind;
- if let Some(label) = destination.label;
- if label.ident.as_str() == "'label";
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr)
++ && let PatKind::Wild = pat.kind
++ && let ExprKind::Struct(qpath, fields, None) = arg.kind
++ && matches!(qpath, QPath::LangItem(LangItem::Range, _))
++ && fields.len() == 2
++ && fields[0].ident.as_str() == "start"
++ && let ExprKind::Lit(ref lit) = fields[0].expr.kind
++ && let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node
++ && fields[1].ident.as_str() == "end"
++ && let ExprKind::Lit(ref lit1) = fields[1].expr.kind
++ && let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node
++ && let ExprKind::Block(block, None) = body.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Semi(e) = block.stmts[0].kind
++ && let ExprKind::Break(destination, None) = e.kind
++ && let Some(label) = destination.label
++ && label.ident.as_str() == "'label"
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let Some(higher::While { condition: condition, body: body }) = higher::While::hir(expr);
- if let ExprKind::Path(ref qpath) = condition.kind;
- if match_qpath(qpath, &["a"]);
- if let ExprKind::Block(block, None) = body.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Semi(e) = block.stmts[0].kind;
- if let ExprKind::Break(destination, None) = e.kind;
- if destination.label.is_none();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let Some(higher::While { condition: condition, body: body }) = higher::While::hir(expr)
++ && let ExprKind::Path(ref qpath) = condition.kind
++ && match_qpath(qpath, &["a"])
++ && let ExprKind::Block(block, None) = body.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Semi(e) = block.stmts[0].kind
++ && let ExprKind::Break(destination, None) = e.kind
++ && destination.label.is_none()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let Some(higher::WhileLet { let_pat: let_pat, let_expr: let_expr, if_then: if_then }) = higher::WhileLet::hir(expr);
- if let PatKind::Lit(lit_expr) = let_pat.kind;
- if let ExprKind::Lit(ref lit) = lit_expr.kind;
- if let LitKind::Bool(true) = lit.node;
- if let ExprKind::Path(ref qpath) = let_expr.kind;
- if match_qpath(qpath, &["a"]);
- if let ExprKind::Block(block, None) = if_then.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Semi(e) = block.stmts[0].kind;
- if let ExprKind::Break(destination, None) = e.kind;
- if destination.label.is_none();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let Some(higher::WhileLet { let_pat: let_pat, let_expr: let_expr, if_then: if_then }) = higher::WhileLet::hir(expr)
++ && let PatKind::Lit(lit_expr) = let_pat.kind
++ && let ExprKind::Lit(ref lit) = lit_expr.kind
++ && let LitKind::Bool(true) = lit.node
++ && let ExprKind::Path(ref qpath) = let_expr.kind
++ && match_qpath(qpath, &["a"])
++ && let ExprKind::Block(block, None) = if_then.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Semi(e) = block.stmts[0].kind
++ && let ExprKind::Break(destination, None) = e.kind
++ && destination.label.is_none()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let ExprKind::Loop(body, None, LoopSource::Loop, _) = expr.kind;
- if body.stmts.len() == 1;
- if let StmtKind::Semi(e) = body.stmts[0].kind;
- if let ExprKind::Break(destination, None) = e.kind;
- if destination.label.is_none();
- if body.expr.is_none();
- then {
- // report your lint here
- }
++if let ExprKind::Loop(body, None, LoopSource::Loop, _) = expr.kind
++ && body.stmts.len() == 1
++ && let StmtKind::Semi(e) = body.stmts[0].kind
++ && let ExprKind::Break(destination, None) = e.kind
++ && destination.label.is_none()
++ && body.expr.is_none()
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let StmtKind::Local(local) = stmt.kind;
- if let Some(init) = local.init;
- if let ExprKind::Match(scrutinee, arms, MatchSource::Normal) = init.kind;
- if let ExprKind::Lit(ref lit) = scrutinee.kind;
- if let LitKind::Int(42, LitIntType::Unsuffixed) = lit.node;
- if arms.len() == 3;
- if let PatKind::Lit(lit_expr) = arms[0].pat.kind;
- if let ExprKind::Lit(ref lit1) = lit_expr.kind;
- if let LitKind::Int(16, LitIntType::Unsuffixed) = lit1.node;
- if arms[0].guard.is_none();
- if let ExprKind::Lit(ref lit2) = arms[0].body.kind;
- if let LitKind::Int(5, LitIntType::Unsuffixed) = lit2.node;
- if let PatKind::Lit(lit_expr1) = arms[1].pat.kind;
- if let ExprKind::Lit(ref lit3) = lit_expr1.kind;
- if let LitKind::Int(17, LitIntType::Unsuffixed) = lit3.node;
- if arms[1].guard.is_none();
- if let ExprKind::Block(block, None) = arms[1].body.kind;
- if block.stmts.len() == 1;
- if let StmtKind::Local(local1) = block.stmts[0].kind;
- if let Some(init1) = local1.init;
- if let ExprKind::Lit(ref lit4) = init1.kind;
- if let LitKind::Int(3, LitIntType::Unsuffixed) = lit4.node;
- if let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local1.pat.kind;
- if name.as_str() == "x";
- if let Some(trailing_expr) = block.expr;
- if let ExprKind::Path(ref qpath) = trailing_expr.kind;
- if match_qpath(qpath, &["x"]);
- if let PatKind::Wild = arms[2].pat.kind;
- if arms[2].guard.is_none();
- if let ExprKind::Lit(ref lit5) = arms[2].body.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit5.node;
- if let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local.pat.kind;
- if name1.as_str() == "a";
- then {
- // report your lint here
- }
++if let StmtKind::Local(local) = stmt.kind
++ && let Some(init) = local.init
++ && let ExprKind::Match(scrutinee, arms, MatchSource::Normal) = init.kind
++ && let ExprKind::Lit(ref lit) = scrutinee.kind
++ && let LitKind::Int(42, LitIntType::Unsuffixed) = lit.node
++ && arms.len() == 3
++ && let PatKind::Lit(lit_expr) = arms[0].pat.kind
++ && let ExprKind::Lit(ref lit1) = lit_expr.kind
++ && let LitKind::Int(16, LitIntType::Unsuffixed) = lit1.node
++ && arms[0].guard.is_none()
++ && let ExprKind::Lit(ref lit2) = arms[0].body.kind
++ && let LitKind::Int(5, LitIntType::Unsuffixed) = lit2.node
++ && let PatKind::Lit(lit_expr1) = arms[1].pat.kind
++ && let ExprKind::Lit(ref lit3) = lit_expr1.kind
++ && let LitKind::Int(17, LitIntType::Unsuffixed) = lit3.node
++ && arms[1].guard.is_none()
++ && let ExprKind::Block(block, None) = arms[1].body.kind
++ && block.stmts.len() == 1
++ && let StmtKind::Local(local1) = block.stmts[0].kind
++ && let Some(init1) = local1.init
++ && let ExprKind::Lit(ref lit4) = init1.kind
++ && let LitKind::Int(3, LitIntType::Unsuffixed) = lit4.node
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name, None) = local1.pat.kind
++ && name.as_str() == "x"
++ && let Some(trailing_expr) = block.expr
++ && let ExprKind::Path(ref qpath) = trailing_expr.kind
++ && match_qpath(qpath, &["x"])
++ && let PatKind::Wild = arms[2].pat.kind
++ && arms[2].guard.is_none()
++ && let ExprKind::Lit(ref lit5) = arms[2].body.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit5.node
++ && let PatKind::Binding(BindingAnnotation::NONE, _, name1, None) = local.pat.kind
++ && name1.as_str() == "a"
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let ExprKind::Repeat(value, length) = expr.kind;
- if let ExprKind::Lit(ref lit) = value.kind;
- if let LitKind::Int(1, LitIntType::Unsigned(UintTy::U8)) = lit.node;
- if let ArrayLen::Body(anon_const) = length;
- let expr1 = &cx.tcx.hir().body(anon_const.body).value;
- if let ExprKind::Lit(ref lit1) = expr1.kind;
- if let LitKind::Int(5, LitIntType::Unsuffixed) = lit1.node;
- then {
- // report your lint here
- }
++if let ExprKind::Repeat(value, length) = expr.kind
++ && let ExprKind::Lit(ref lit) = value.kind
++ && let LitKind::Int(1, LitIntType::Unsigned(UintTy::U8)) = lit.node
++ && let ArrayLen::Body(anon_const) = length
++ && expr1 = &cx.tcx.hir().body(anon_const.body).value
++ && let ExprKind::Lit(ref lit1) = expr1.kind
++ && let LitKind::Int(5, LitIntType::Unsuffixed) = lit1.node
++{
++ // report your lint here
+}
--- /dev/null
- if_chain! {
- if let ExprKind::Struct(qpath, fields, None) = expr.kind;
- if match_qpath(qpath, &["Test"]);
- if fields.len() == 1;
- if fields[0].ident.as_str() == "field";
- if let ExprKind::If(cond, then, Some(else_expr)) = fields[0].expr.kind;
- if let ExprKind::DropTemps(expr1) = cond.kind;
- if let ExprKind::Lit(ref lit) = expr1.kind;
- if let LitKind::Bool(true) = lit.node;
- if let ExprKind::Block(block, None) = then.kind;
- if block.stmts.is_empty();
- if let Some(trailing_expr) = block.expr;
- if let ExprKind::Lit(ref lit1) = trailing_expr.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node;
- if let ExprKind::Block(block1, None) = else_expr.kind;
- if block1.stmts.is_empty();
- if let Some(trailing_expr1) = block1.expr;
- if let ExprKind::Lit(ref lit2) = trailing_expr1.kind;
- if let LitKind::Int(0, LitIntType::Unsuffixed) = lit2.node;
- then {
- // report your lint here
- }
++if let ExprKind::Struct(qpath, fields, None) = expr.kind
++ && match_qpath(qpath, &["Test"])
++ && fields.len() == 1
++ && fields[0].ident.as_str() == "field"
++ && let ExprKind::If(cond, then, Some(else_expr)) = fields[0].expr.kind
++ && let ExprKind::DropTemps(expr1) = cond.kind
++ && let ExprKind::Lit(ref lit) = expr1.kind
++ && let LitKind::Bool(true) = lit.node
++ && let ExprKind::Block(block, None) = then.kind
++ && block.stmts.is_empty()
++ && let Some(trailing_expr) = block.expr
++ && let ExprKind::Lit(ref lit1) = trailing_expr.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node
++ && let ExprKind::Block(block1, None) = else_expr.kind
++ && block1.stmts.is_empty()
++ && let Some(trailing_expr1) = block1.expr
++ && let ExprKind::Lit(ref lit2) = trailing_expr1.kind
++ && let LitKind::Int(0, LitIntType::Unsuffixed) = lit2.node
++{
++ // report your lint here
+}
- if_chain! {
- if let PatKind::Struct(ref qpath, fields, false) = arm.pat.kind;
- if match_qpath(qpath, &["Test"]);
- if fields.len() == 1;
- if fields[0].ident.as_str() == "field";
- if let PatKind::Lit(lit_expr) = fields[0].pat.kind;
- if let ExprKind::Lit(ref lit) = lit_expr.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node;
- if arm.guard.is_none();
- if let ExprKind::Block(block, None) = arm.body.kind;
- if block.stmts.is_empty();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let PatKind::Struct(ref qpath, fields, false) = arm.pat.kind
++ && match_qpath(qpath, &["Test"])
++ && fields.len() == 1
++ && fields[0].ident.as_str() == "field"
++ && let PatKind::Lit(lit_expr) = fields[0].pat.kind
++ && let ExprKind::Lit(ref lit) = lit_expr.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node
++ && arm.guard.is_none()
++ && let ExprKind::Block(block, None) = arm.body.kind
++ && block.stmts.is_empty()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let PatKind::TupleStruct(ref qpath, fields, None) = arm.pat.kind;
- if match_qpath(qpath, &["TestTuple"]);
- if fields.len() == 1;
- if let PatKind::Lit(lit_expr) = fields[0].kind;
- if let ExprKind::Lit(ref lit) = lit_expr.kind;
- if let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node;
- if arm.guard.is_none();
- if let ExprKind::Block(block, None) = arm.body.kind;
- if block.stmts.is_empty();
- if block.expr.is_none();
- then {
- // report your lint here
- }
++if let PatKind::TupleStruct(ref qpath, fields, None) = arm.pat.kind
++ && match_qpath(qpath, &["TestTuple"])
++ && fields.len() == 1
++ && let PatKind::Lit(lit_expr) = fields[0].kind
++ && let ExprKind::Lit(ref lit) = lit_expr.kind
++ && let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node
++ && arm.guard.is_none()
++ && let ExprKind::Block(block, None) = arm.body.kind
++ && block.stmts.is_empty()
++ && block.expr.is_none()
++{
++ // report your lint here
+}
- if_chain! {
- if let ExprKind::MethodCall(method_name, receiver, args, _) = expr.kind;
- if method_name.ident.as_str() == "test";
- if let ExprKind::Path(ref qpath) = receiver.kind;
- if match_qpath(qpath, &["test_method_call"]);
- if args.is_empty();
- then {
- // report your lint here
- }
++if let ExprKind::MethodCall(method_name, receiver, args, _) = expr.kind
++ && method_name.ident.as_str() == "test"
++ && let ExprKind::Path(ref qpath) = receiver.kind
++ && match_qpath(qpath, &["test_method_call"])
++ && args.is_empty()
++{
++ // report your lint here
+}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::box_default)]
++
++#[derive(Default)]
++struct ImplementsDefault;
++
++struct OwnDefault;
++
++impl OwnDefault {
++ fn default() -> Self {
++ Self
++ }
++}
++
++macro_rules! outer {
++ ($e: expr) => {
++ $e
++ };
++}
++
++fn main() {
++ let _string: Box<String> = Box::default();
++ let _byte = Box::<u8>::default();
++ let _vec = Box::<std::vec::Vec<u8>>::default();
++ let _impl = Box::<ImplementsDefault>::default();
++ let _impl2 = Box::<ImplementsDefault>::default();
++ let _impl3: Box<ImplementsDefault> = Box::default();
++ let _own = Box::new(OwnDefault::default()); // should not lint
++ let _in_macro = outer!(Box::<std::string::String>::default());
++ let _string_default = outer!(Box::<std::string::String>::default());
++ let _vec2: Box<Vec<ImplementsDefault>> = Box::default();
++ let _vec3: Box<Vec<bool>> = Box::default();
++ let _vec4: Box<_> = Box::<std::vec::Vec<bool>>::default();
++ let _more = ret_ty_fn();
++ call_ty_fn(Box::default());
++}
++
++fn ret_ty_fn() -> Box<bool> {
++ Box::<bool>::default()
++}
++
++#[allow(clippy::boxed_local)]
++fn call_ty_fn(_b: Box<u8>) {
++ issue_9621_dyn_trait();
++}
++
++use std::io::{Read, Result};
++
++impl Read for ImplementsDefault {
++ fn read(&mut self, _: &mut [u8]) -> Result<usize> {
++ Ok(0)
++ }
++}
++
++fn issue_9621_dyn_trait() {
++ let _: Box<dyn Read> = Box::<ImplementsDefault>::default();
++}
--- /dev/null
- // false negative: default is from different expansion
++// run-rustfix
+#![warn(clippy::box_default)]
+
+#[derive(Default)]
+struct ImplementsDefault;
+
+struct OwnDefault;
+
+impl OwnDefault {
+ fn default() -> Self {
+ Self
+ }
+}
+
+macro_rules! outer {
+ ($e: expr) => {
+ $e
+ };
+}
+
+fn main() {
+ let _string: Box<String> = Box::new(Default::default());
+ let _byte = Box::new(u8::default());
+ let _vec = Box::new(Vec::<u8>::new());
+ let _impl = Box::new(ImplementsDefault::default());
+ let _impl2 = Box::new(<ImplementsDefault as Default>::default());
+ let _impl3: Box<ImplementsDefault> = Box::new(Default::default());
+ let _own = Box::new(OwnDefault::default()); // should not lint
+ let _in_macro = outer!(Box::new(String::new()));
++ let _string_default = outer!(Box::new(String::from("")));
+ let _vec2: Box<Vec<ImplementsDefault>> = Box::new(vec![]);
++ let _vec3: Box<Vec<bool>> = Box::new(Vec::from([]));
++ let _vec4: Box<_> = Box::new(Vec::from([false; 0]));
++ let _more = ret_ty_fn();
++ call_ty_fn(Box::new(u8::default()));
++}
++
++fn ret_ty_fn() -> Box<bool> {
++ Box::new(bool::default())
++}
++
++#[allow(clippy::boxed_local)]
++fn call_ty_fn(_b: Box<u8>) {
++ issue_9621_dyn_trait();
++}
++
++use std::io::{Read, Result};
++
++impl Read for ImplementsDefault {
++ fn read(&mut self, _: &mut [u8]) -> Result<usize> {
++ Ok(0)
++ }
++}
++
++fn issue_9621_dyn_trait() {
++ let _: Box<dyn Read> = Box::new(ImplementsDefault::default());
+}
--- /dev/null
- --> $DIR/box_default.rs:21:32
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ --> $DIR/box_default.rs:22:32
+ |
+LL | let _string: Box<String> = Box::new(Default::default());
- = help: use `Box::default()` instead
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+ |
- --> $DIR/box_default.rs:22:17
+ = note: `-D clippy::box-default` implied by `-D warnings`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^
- |
- = help: use `Box::default()` instead
++ --> $DIR/box_default.rs:23:17
+ |
+LL | let _byte = Box::new(u8::default());
- --> $DIR/box_default.rs:23:16
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<u8>::default()`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^
- |
- = help: use `Box::default()` instead
++ --> $DIR/box_default.rs:24:16
+ |
+LL | let _vec = Box::new(Vec::<u8>::new());
- --> $DIR/box_default.rs:24:17
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::vec::Vec<u8>>::default()`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- |
- = help: use `Box::default()` instead
++ --> $DIR/box_default.rs:25:17
+ |
+LL | let _impl = Box::new(ImplementsDefault::default());
- --> $DIR/box_default.rs:25:18
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- |
- = help: use `Box::default()` instead
++ --> $DIR/box_default.rs:26:18
+ |
+LL | let _impl2 = Box::new(<ImplementsDefault as Default>::default());
- --> $DIR/box_default.rs:26:42
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- |
- = help: use `Box::default()` instead
++ --> $DIR/box_default.rs:27:42
+ |
+LL | let _impl3: Box<ImplementsDefault> = Box::new(Default::default());
- --> $DIR/box_default.rs:28:28
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+
+error: `Box::new(_)` of default value
- | ^^^^^^^^^^^^^^^^^^^^^^^
++ --> $DIR/box_default.rs:29:28
+ |
+LL | let _in_macro = outer!(Box::new(String::new()));
- = help: use `Box::default()` instead
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::string::String>::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:30:34
++ |
++LL | let _string_default = outer!(Box::new(String::from("")));
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::string::String>::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:31:46
++ |
++LL | let _vec2: Box<Vec<ImplementsDefault>> = Box::new(vec![]);
++ | ^^^^^^^^^^^^^^^^ help: try: `Box::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:32:33
++ |
++LL | let _vec3: Box<Vec<bool>> = Box::new(Vec::from([]));
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:33:25
++ |
++LL | let _vec4: Box<_> = Box::new(Vec::from([false; 0]));
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::vec::Vec<bool>>::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:35:16
++ |
++LL | call_ty_fn(Box::new(u8::default()));
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:39:5
++ |
++LL | Box::new(bool::default())
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<bool>::default()`
++
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:56:28
+ |
- error: aborting due to 7 previous errors
++LL | let _: Box<dyn Read> = Box::new(ImplementsDefault::default());
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
++error: aborting due to 14 previous errors
+
--- /dev/null
--- /dev/null
++#![feature(lang_items, start, libc)]
++#![warn(clippy::box_default)]
++#![no_std]
++
++pub struct NotBox<T> {
++ _value: T,
++}
++
++impl<T> NotBox<T> {
++ pub fn new(value: T) -> Self {
++ Self { _value: value }
++ }
++}
++
++impl<T: Default> Default for NotBox<T> {
++ fn default() -> Self {
++ Self::new(T::default())
++ }
++}
++
++#[start]
++fn main(_argc: isize, _argv: *const *const u8) -> isize {
++ let _p = NotBox::new(isize::default());
++ 0
++}
++
++#[panic_handler]
++fn panic(_info: &core::panic::PanicInfo) -> ! {
++ loop {}
++}
++
++#[lang = "eh_personality"]
++extern "C" fn eh_personality() {}
--- /dev/null
- #![allow(clippy::uninlined_format_args)]
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::cast_abs_to_unsigned)]
++#![allow(clippy::uninlined_format_args, unused)]
+
+fn main() {
+ let x: i32 = -42;
+ let y: u32 = x.unsigned_abs();
+ println!("The absolute value of {} is {}", x, y);
+
+ let a: i32 = -3;
+ let _: usize = a.unsigned_abs() as usize;
+ let _: usize = a.unsigned_abs() as _;
+ let _ = a.unsigned_abs() as usize;
+
+ let a: i64 = -3;
+ let _ = a.unsigned_abs() as usize;
+ let _ = a.unsigned_abs() as u8;
+ let _ = a.unsigned_abs() as u16;
+ let _ = a.unsigned_abs() as u32;
+ let _ = a.unsigned_abs();
+ let _ = a.unsigned_abs() as u128;
+
+ let a: isize = -3;
+ let _ = a.unsigned_abs();
+ let _ = a.unsigned_abs() as u8;
+ let _ = a.unsigned_abs() as u16;
+ let _ = a.unsigned_abs() as u32;
+ let _ = a.unsigned_abs() as u64;
+ let _ = a.unsigned_abs() as u128;
+
+ let _ = (x as i64 - y as i64).unsigned_abs() as u32;
+}
++
++fn msrv_1_50() {
++ #![clippy::msrv = "1.50"]
++
++ let x: i32 = 10;
++ assert_eq!(10u32, x.abs() as u32);
++}
++
++fn msrv_1_51() {
++ #![clippy::msrv = "1.51"]
++
++ let x: i32 = 10;
++ assert_eq!(10u32, x.unsigned_abs());
++}
--- /dev/null
- #![allow(clippy::uninlined_format_args)]
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::cast_abs_to_unsigned)]
++#![allow(clippy::uninlined_format_args, unused)]
+
+fn main() {
+ let x: i32 = -42;
+ let y: u32 = x.abs() as u32;
+ println!("The absolute value of {} is {}", x, y);
+
+ let a: i32 = -3;
+ let _: usize = a.abs() as usize;
+ let _: usize = a.abs() as _;
+ let _ = a.abs() as usize;
+
+ let a: i64 = -3;
+ let _ = a.abs() as usize;
+ let _ = a.abs() as u8;
+ let _ = a.abs() as u16;
+ let _ = a.abs() as u32;
+ let _ = a.abs() as u64;
+ let _ = a.abs() as u128;
+
+ let a: isize = -3;
+ let _ = a.abs() as usize;
+ let _ = a.abs() as u8;
+ let _ = a.abs() as u16;
+ let _ = a.abs() as u32;
+ let _ = a.abs() as u64;
+ let _ = a.abs() as u128;
+
+ let _ = (x as i64 - y as i64).abs() as u32;
+}
++
++fn msrv_1_50() {
++ #![clippy::msrv = "1.50"]
++
++ let x: i32 = 10;
++ assert_eq!(10u32, x.abs() as u32);
++}
++
++fn msrv_1_51() {
++ #![clippy::msrv = "1.51"]
++
++ let x: i32 = 10;
++ assert_eq!(10u32, x.abs() as u32);
++}
--- /dev/null
- --> $DIR/cast_abs_to_unsigned.rs:7:18
+error: casting the result of `i32::abs()` to u32
- --> $DIR/cast_abs_to_unsigned.rs:11:20
++ --> $DIR/cast_abs_to_unsigned.rs:9:18
+ |
+LL | let y: u32 = x.abs() as u32;
+ | ^^^^^^^^^^^^^^ help: replace with: `x.unsigned_abs()`
+ |
+ = note: `-D clippy::cast-abs-to-unsigned` implied by `-D warnings`
+
+error: casting the result of `i32::abs()` to usize
- --> $DIR/cast_abs_to_unsigned.rs:12:20
++ --> $DIR/cast_abs_to_unsigned.rs:13:20
+ |
+LL | let _: usize = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i32::abs()` to usize
- --> $DIR/cast_abs_to_unsigned.rs:13:13
++ --> $DIR/cast_abs_to_unsigned.rs:14:20
+ |
+LL | let _: usize = a.abs() as _;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i32::abs()` to usize
- --> $DIR/cast_abs_to_unsigned.rs:16:13
++ --> $DIR/cast_abs_to_unsigned.rs:15:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to usize
- --> $DIR/cast_abs_to_unsigned.rs:17:13
++ --> $DIR/cast_abs_to_unsigned.rs:18:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u8
- --> $DIR/cast_abs_to_unsigned.rs:18:13
++ --> $DIR/cast_abs_to_unsigned.rs:19:13
+ |
+LL | let _ = a.abs() as u8;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u16
- --> $DIR/cast_abs_to_unsigned.rs:19:13
++ --> $DIR/cast_abs_to_unsigned.rs:20:13
+ |
+LL | let _ = a.abs() as u16;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u32
- --> $DIR/cast_abs_to_unsigned.rs:20:13
++ --> $DIR/cast_abs_to_unsigned.rs:21:13
+ |
+LL | let _ = a.abs() as u32;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u64
- --> $DIR/cast_abs_to_unsigned.rs:21:13
++ --> $DIR/cast_abs_to_unsigned.rs:22:13
+ |
+LL | let _ = a.abs() as u64;
+ | ^^^^^^^^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u128
- --> $DIR/cast_abs_to_unsigned.rs:24:13
++ --> $DIR/cast_abs_to_unsigned.rs:23:13
+ |
+LL | let _ = a.abs() as u128;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to usize
- --> $DIR/cast_abs_to_unsigned.rs:25:13
++ --> $DIR/cast_abs_to_unsigned.rs:26:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^^^^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u8
- --> $DIR/cast_abs_to_unsigned.rs:26:13
++ --> $DIR/cast_abs_to_unsigned.rs:27:13
+ |
+LL | let _ = a.abs() as u8;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u16
- --> $DIR/cast_abs_to_unsigned.rs:27:13
++ --> $DIR/cast_abs_to_unsigned.rs:28:13
+ |
+LL | let _ = a.abs() as u16;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u32
- --> $DIR/cast_abs_to_unsigned.rs:28:13
++ --> $DIR/cast_abs_to_unsigned.rs:29:13
+ |
+LL | let _ = a.abs() as u32;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u64
- --> $DIR/cast_abs_to_unsigned.rs:29:13
++ --> $DIR/cast_abs_to_unsigned.rs:30:13
+ |
+LL | let _ = a.abs() as u64;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u128
- --> $DIR/cast_abs_to_unsigned.rs:31:13
++ --> $DIR/cast_abs_to_unsigned.rs:31:13
+ |
+LL | let _ = a.abs() as u128;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u32
- error: aborting due to 17 previous errors
++ --> $DIR/cast_abs_to_unsigned.rs:33:13
+ |
+LL | let _ = (x as i64 - y as i64).abs() as u32;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `(x as i64 - y as i64).unsigned_abs()`
+
++error: casting the result of `i32::abs()` to u32
++ --> $DIR/cast_abs_to_unsigned.rs:47:23
++ |
++LL | assert_eq!(10u32, x.abs() as u32);
++ | ^^^^^^^^^^^^^^ help: replace with: `x.unsigned_abs()`
++
++error: aborting due to 18 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(dead_code)]
+#![warn(clippy::cast_lossless)]
+
+fn main() {
+ // Test clippy::cast_lossless with casts to integer types
+ let _ = u8::from(true);
+ let _ = u16::from(true);
+ let _ = u32::from(true);
+ let _ = u64::from(true);
+ let _ = u128::from(true);
+ let _ = usize::from(true);
+
+ let _ = i8::from(true);
+ let _ = i16::from(true);
+ let _ = i32::from(true);
+ let _ = i64::from(true);
+ let _ = i128::from(true);
+ let _ = isize::from(true);
+
+ // Test with an expression wrapped in parens
+ let _ = u16::from(true | false);
+}
+
+// The lint would suggest using `u32::from(input)` here but the `XX::from` function is not const,
+// so we skip the lint if the expression is in a const fn.
+// See #3656
+const fn abc(input: bool) -> u32 {
+ input as u32
+}
+
+// Same as the above issue. We can't suggest `::from` in const fns in impls
+mod cast_lossless_in_impl {
+ struct A;
+
+ impl A {
+ pub const fn convert(x: bool) -> u64 {
+ x as u64
+ }
+ }
+}
++
++fn msrv_1_27() {
++ #![clippy::msrv = "1.27"]
++
++ let _ = true as u8;
++}
++
++fn msrv_1_28() {
++ #![clippy::msrv = "1.28"]
++
++ let _ = u8::from(true);
++}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(dead_code)]
+#![warn(clippy::cast_lossless)]
+
+fn main() {
+ // Test clippy::cast_lossless with casts to integer types
+ let _ = true as u8;
+ let _ = true as u16;
+ let _ = true as u32;
+ let _ = true as u64;
+ let _ = true as u128;
+ let _ = true as usize;
+
+ let _ = true as i8;
+ let _ = true as i16;
+ let _ = true as i32;
+ let _ = true as i64;
+ let _ = true as i128;
+ let _ = true as isize;
+
+ // Test with an expression wrapped in parens
+ let _ = (true | false) as u16;
+}
+
+// The lint would suggest using `u32::from(input)` here but the `XX::from` function is not const,
+// so we skip the lint if the expression is in a const fn.
+// See #3656
+const fn abc(input: bool) -> u32 {
+ input as u32
+}
+
+// Same as the above issue. We can't suggest `::from` in const fns in impls
+mod cast_lossless_in_impl {
+ struct A;
+
+ impl A {
+ pub const fn convert(x: bool) -> u64 {
+ x as u64
+ }
+ }
+}
++
++fn msrv_1_27() {
++ #![clippy::msrv = "1.27"]
++
++ let _ = true as u8;
++}
++
++fn msrv_1_28() {
++ #![clippy::msrv = "1.28"]
++
++ let _ = true as u8;
++}
--- /dev/null
- --> $DIR/cast_lossless_bool.rs:8:13
+error: casting `bool` to `u8` is more cleanly stated with `u8::from(_)`
- --> $DIR/cast_lossless_bool.rs:9:13
++ --> $DIR/cast_lossless_bool.rs:9:13
+ |
+LL | let _ = true as u8;
+ | ^^^^^^^^^^ help: try: `u8::from(true)`
+ |
+ = note: `-D clippy::cast-lossless` implied by `-D warnings`
+
+error: casting `bool` to `u16` is more cleanly stated with `u16::from(_)`
- --> $DIR/cast_lossless_bool.rs:10:13
++ --> $DIR/cast_lossless_bool.rs:10:13
+ |
+LL | let _ = true as u16;
+ | ^^^^^^^^^^^ help: try: `u16::from(true)`
+
+error: casting `bool` to `u32` is more cleanly stated with `u32::from(_)`
- --> $DIR/cast_lossless_bool.rs:11:13
++ --> $DIR/cast_lossless_bool.rs:11:13
+ |
+LL | let _ = true as u32;
+ | ^^^^^^^^^^^ help: try: `u32::from(true)`
+
+error: casting `bool` to `u64` is more cleanly stated with `u64::from(_)`
- --> $DIR/cast_lossless_bool.rs:12:13
++ --> $DIR/cast_lossless_bool.rs:12:13
+ |
+LL | let _ = true as u64;
+ | ^^^^^^^^^^^ help: try: `u64::from(true)`
+
+error: casting `bool` to `u128` is more cleanly stated with `u128::from(_)`
- --> $DIR/cast_lossless_bool.rs:13:13
++ --> $DIR/cast_lossless_bool.rs:13:13
+ |
+LL | let _ = true as u128;
+ | ^^^^^^^^^^^^ help: try: `u128::from(true)`
+
+error: casting `bool` to `usize` is more cleanly stated with `usize::from(_)`
- --> $DIR/cast_lossless_bool.rs:15:13
++ --> $DIR/cast_lossless_bool.rs:14:13
+ |
+LL | let _ = true as usize;
+ | ^^^^^^^^^^^^^ help: try: `usize::from(true)`
+
+error: casting `bool` to `i8` is more cleanly stated with `i8::from(_)`
- --> $DIR/cast_lossless_bool.rs:16:13
++ --> $DIR/cast_lossless_bool.rs:16:13
+ |
+LL | let _ = true as i8;
+ | ^^^^^^^^^^ help: try: `i8::from(true)`
+
+error: casting `bool` to `i16` is more cleanly stated with `i16::from(_)`
- --> $DIR/cast_lossless_bool.rs:17:13
++ --> $DIR/cast_lossless_bool.rs:17:13
+ |
+LL | let _ = true as i16;
+ | ^^^^^^^^^^^ help: try: `i16::from(true)`
+
+error: casting `bool` to `i32` is more cleanly stated with `i32::from(_)`
- --> $DIR/cast_lossless_bool.rs:18:13
++ --> $DIR/cast_lossless_bool.rs:18:13
+ |
+LL | let _ = true as i32;
+ | ^^^^^^^^^^^ help: try: `i32::from(true)`
+
+error: casting `bool` to `i64` is more cleanly stated with `i64::from(_)`
- --> $DIR/cast_lossless_bool.rs:19:13
++ --> $DIR/cast_lossless_bool.rs:19:13
+ |
+LL | let _ = true as i64;
+ | ^^^^^^^^^^^ help: try: `i64::from(true)`
+
+error: casting `bool` to `i128` is more cleanly stated with `i128::from(_)`
- --> $DIR/cast_lossless_bool.rs:20:13
++ --> $DIR/cast_lossless_bool.rs:20:13
+ |
+LL | let _ = true as i128;
+ | ^^^^^^^^^^^^ help: try: `i128::from(true)`
+
+error: casting `bool` to `isize` is more cleanly stated with `isize::from(_)`
- --> $DIR/cast_lossless_bool.rs:23:13
++ --> $DIR/cast_lossless_bool.rs:21:13
+ |
+LL | let _ = true as isize;
+ | ^^^^^^^^^^^^^ help: try: `isize::from(true)`
+
+error: casting `bool` to `u16` is more cleanly stated with `u16::from(_)`
- error: aborting due to 13 previous errors
++ --> $DIR/cast_lossless_bool.rs:24:13
+ |
+LL | let _ = (true | false) as u16;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::from(true | false)`
+
++error: casting `bool` to `u8` is more cleanly stated with `u8::from(_)`
++ --> $DIR/cast_lossless_bool.rs:54:13
++ |
++LL | let _ = true as u8;
++ | ^^^^^^^^^^ help: try: `u8::from(true)`
++
++error: aborting due to 14 previous errors
+
--- /dev/null
--- /dev/null
++#![warn(clippy::cast_nan_to_int)]
++#![allow(clippy::eq_op)]
++
++fn main() {
++ let _ = (0.0_f32 / -0.0) as usize;
++ let _ = (f64::INFINITY * -0.0) as usize;
++ let _ = (0.0 * f32::INFINITY) as usize;
++
++ let _ = (f64::INFINITY + f64::NEG_INFINITY) as usize;
++ let _ = (f32::INFINITY - f32::INFINITY) as usize;
++ let _ = (f32::INFINITY / f32::NEG_INFINITY) as usize;
++
++ // those won't be linted:
++ let _ = (1.0_f32 / 0.0) as usize;
++ let _ = (f32::INFINITY * f32::NEG_INFINITY) as usize;
++ let _ = (f32::INFINITY - f32::NEG_INFINITY) as usize;
++ let _ = (f64::INFINITY - 0.0) as usize;
++}
--- /dev/null
--- /dev/null
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:5:13
++ |
++LL | let _ = (0.0_f32 / -0.0) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++ = note: `-D clippy::cast-nan-to-int` implied by `-D warnings`
++
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:6:13
++ |
++LL | let _ = (f64::INFINITY * -0.0) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:7:13
++ |
++LL | let _ = (0.0 * f32::INFINITY) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:9:13
++ |
++LL | let _ = (f64::INFINITY + f64::NEG_INFINITY) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:10:13
++ |
++LL | let _ = (f32::INFINITY - f32::INFINITY) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++
++error: casting a known NaN to usize
++ --> $DIR/cast_nan_to_int.rs:11:13
++ |
++LL | let _ = (f32::INFINITY / f32::NEG_INFINITY) as usize;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: this always evaluates to 0
++
++error: aborting due to 6 previous errors
++
--- /dev/null
- #![feature(stmt_expr_attributes)]
+// run-rustfix
++#![feature(stmt_expr_attributes, custom_inner_attributes)]
+
+#![allow(unused, clippy::no_effect, clippy::unnecessary_operation)]
+#![warn(clippy::deprecated_cfg_attr)]
+
+// This doesn't get linted, see known problems
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
+#[rustfmt::skip]
+trait Foo
+{
+fn foo(
+);
+}
+
+fn skip_on_statements() {
+ #[rustfmt::skip]
+ 5+3;
+}
+
+#[rustfmt::skip]
+fn main() {
+ foo::f();
+}
+
+mod foo {
+ #![cfg_attr(rustfmt, rustfmt_skip)]
+
+ pub fn f() {}
+}
++
++fn msrv_1_29() {
++ #![clippy::msrv = "1.29"]
++
++ #[cfg_attr(rustfmt, rustfmt::skip)]
++ 1+29;
++}
++
++fn msrv_1_30() {
++ #![clippy::msrv = "1.30"]
++
++ #[rustfmt::skip]
++ 1+30;
++}
--- /dev/null
- #![feature(stmt_expr_attributes)]
+// run-rustfix
++#![feature(stmt_expr_attributes, custom_inner_attributes)]
+
+#![allow(unused, clippy::no_effect, clippy::unnecessary_operation)]
+#![warn(clippy::deprecated_cfg_attr)]
+
+// This doesn't get linted, see known problems
+#![cfg_attr(rustfmt, rustfmt_skip)]
+
+#[rustfmt::skip]
+trait Foo
+{
+fn foo(
+);
+}
+
+fn skip_on_statements() {
+ #[cfg_attr(rustfmt, rustfmt::skip)]
+ 5+3;
+}
+
+#[cfg_attr(rustfmt, rustfmt_skip)]
+fn main() {
+ foo::f();
+}
+
+mod foo {
+ #![cfg_attr(rustfmt, rustfmt_skip)]
+
+ pub fn f() {}
+}
++
++fn msrv_1_29() {
++ #![clippy::msrv = "1.29"]
++
++ #[cfg_attr(rustfmt, rustfmt::skip)]
++ 1+29;
++}
++
++fn msrv_1_30() {
++ #![clippy::msrv = "1.30"]
++
++ #[cfg_attr(rustfmt, rustfmt::skip)]
++ 1+30;
++}
--- /dev/null
- error: aborting due to 2 previous errors
+error: `cfg_attr` is deprecated for rustfmt and got replaced by tool attributes
+ --> $DIR/cfg_attr_rustfmt.rs:18:5
+ |
+LL | #[cfg_attr(rustfmt, rustfmt::skip)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `#[rustfmt::skip]`
+ |
+ = note: `-D clippy::deprecated-cfg-attr` implied by `-D warnings`
+
+error: `cfg_attr` is deprecated for rustfmt and got replaced by tool attributes
+ --> $DIR/cfg_attr_rustfmt.rs:22:1
+ |
+LL | #[cfg_attr(rustfmt, rustfmt_skip)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `#[rustfmt::skip]`
+
++error: `cfg_attr` is deprecated for rustfmt and got replaced by tool attributes
++ --> $DIR/cfg_attr_rustfmt.rs:43:5
++ |
++LL | #[cfg_attr(rustfmt, rustfmt::skip)]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `#[rustfmt::skip]`
++
++error: aborting due to 3 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(
+ clippy::cast_lossless,
++ unused,
+ // Int::max_value will be deprecated in the future
+ deprecated,
+)]
+#![warn(clippy::checked_conversions)]
+
+// Positive tests
+
+// Signed to unsigned
+
+pub fn i64_to_u32(value: i64) {
+ let _ = u32::try_from(value).is_ok();
+ let _ = u32::try_from(value).is_ok();
+}
+
+pub fn i64_to_u16(value: i64) {
+ let _ = u16::try_from(value).is_ok();
+ let _ = u16::try_from(value).is_ok();
+}
+
+pub fn isize_to_u8(value: isize) {
+ let _ = u8::try_from(value).is_ok();
+ let _ = u8::try_from(value).is_ok();
+}
+
+// Signed to signed
+
+pub fn i64_to_i32(value: i64) {
+ let _ = i32::try_from(value).is_ok();
+ let _ = i32::try_from(value).is_ok();
+}
+
+pub fn i64_to_i16(value: i64) {
+ let _ = i16::try_from(value).is_ok();
+ let _ = i16::try_from(value).is_ok();
+}
+
+// Unsigned to X
+
+pub fn u32_to_i32(value: u32) {
+ let _ = i32::try_from(value).is_ok();
+ let _ = i32::try_from(value).is_ok();
+}
+
+pub fn usize_to_isize(value: usize) {
+ let _ = isize::try_from(value).is_ok() && value as i32 == 5;
+ let _ = isize::try_from(value).is_ok() && value as i32 == 5;
+}
+
+pub fn u32_to_u16(value: u32) {
+ let _ = u16::try_from(value).is_ok() && value as i32 == 5;
+ let _ = u16::try_from(value).is_ok() && value as i32 == 5;
+}
+
+// Negative tests
+
+pub fn no_i64_to_i32(value: i64) {
+ let _ = value <= (i32::max_value() as i64) && value >= 0;
+ let _ = value <= (i32::MAX as i64) && value >= 0;
+}
+
+pub fn no_isize_to_u8(value: isize) {
+ let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize);
+ let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize);
+}
+
+pub fn i8_to_u8(value: i8) {
+ let _ = value >= 0;
+}
+
+// Do not lint
+pub const fn issue_8898(i: u32) -> bool {
+ i <= i32::MAX as u32
+}
+
++fn msrv_1_33() {
++ #![clippy::msrv = "1.33"]
++
++ let value: i64 = 33;
++ let _ = value <= (u32::MAX as i64) && value >= 0;
++}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let value: i64 = 34;
++ let _ = u32::try_from(value).is_ok();
++}
++
+fn main() {}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(
+ clippy::cast_lossless,
++ unused,
+ // Int::max_value will be deprecated in the future
+ deprecated,
+)]
+#![warn(clippy::checked_conversions)]
+
+// Positive tests
+
+// Signed to unsigned
+
+pub fn i64_to_u32(value: i64) {
+ let _ = value <= (u32::max_value() as i64) && value >= 0;
+ let _ = value <= (u32::MAX as i64) && value >= 0;
+}
+
+pub fn i64_to_u16(value: i64) {
+ let _ = value <= i64::from(u16::max_value()) && value >= 0;
+ let _ = value <= i64::from(u16::MAX) && value >= 0;
+}
+
+pub fn isize_to_u8(value: isize) {
+ let _ = value <= (u8::max_value() as isize) && value >= 0;
+ let _ = value <= (u8::MAX as isize) && value >= 0;
+}
+
+// Signed to signed
+
+pub fn i64_to_i32(value: i64) {
+ let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64);
+ let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64);
+}
+
+pub fn i64_to_i16(value: i64) {
+ let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value());
+ let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN);
+}
+
+// Unsigned to X
+
+pub fn u32_to_i32(value: u32) {
+ let _ = value <= i32::max_value() as u32;
+ let _ = value <= i32::MAX as u32;
+}
+
+pub fn usize_to_isize(value: usize) {
+ let _ = value <= isize::max_value() as usize && value as i32 == 5;
+ let _ = value <= isize::MAX as usize && value as i32 == 5;
+}
+
+pub fn u32_to_u16(value: u32) {
+ let _ = value <= u16::max_value() as u32 && value as i32 == 5;
+ let _ = value <= u16::MAX as u32 && value as i32 == 5;
+}
+
+// Negative tests
+
+pub fn no_i64_to_i32(value: i64) {
+ let _ = value <= (i32::max_value() as i64) && value >= 0;
+ let _ = value <= (i32::MAX as i64) && value >= 0;
+}
+
+pub fn no_isize_to_u8(value: isize) {
+ let _ = value <= (u8::max_value() as isize) && value >= (u8::min_value() as isize);
+ let _ = value <= (u8::MAX as isize) && value >= (u8::MIN as isize);
+}
+
+pub fn i8_to_u8(value: i8) {
+ let _ = value >= 0;
+}
+
+// Do not lint
+pub const fn issue_8898(i: u32) -> bool {
+ i <= i32::MAX as u32
+}
+
++fn msrv_1_33() {
++ #![clippy::msrv = "1.33"]
++
++ let value: i64 = 33;
++ let _ = value <= (u32::MAX as i64) && value >= 0;
++}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let value: i64 = 34;
++ let _ = value <= (u32::MAX as i64) && value >= 0;
++}
++
+fn main() {}
--- /dev/null
- --> $DIR/checked_conversions.rs:15:13
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:16:13
++ --> $DIR/checked_conversions.rs:17:13
+ |
+LL | let _ = value <= (u32::max_value() as i64) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()`
+ |
+ = note: `-D clippy::checked-conversions` implied by `-D warnings`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:20:13
++ --> $DIR/checked_conversions.rs:18:13
+ |
+LL | let _ = value <= (u32::MAX as i64) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:21:13
++ --> $DIR/checked_conversions.rs:22:13
+ |
+LL | let _ = value <= i64::from(u16::max_value()) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:25:13
++ --> $DIR/checked_conversions.rs:23:13
+ |
+LL | let _ = value <= i64::from(u16::MAX) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:26:13
++ --> $DIR/checked_conversions.rs:27:13
+ |
+LL | let _ = value <= (u8::max_value() as isize) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:32:13
++ --> $DIR/checked_conversions.rs:28:13
+ |
+LL | let _ = value <= (u8::MAX as isize) && value >= 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:33:13
++ --> $DIR/checked_conversions.rs:34:13
+ |
+LL | let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:37:13
++ --> $DIR/checked_conversions.rs:35:13
+ |
+LL | let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:38:13
++ --> $DIR/checked_conversions.rs:39:13
+ |
+LL | let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:44:13
++ --> $DIR/checked_conversions.rs:40:13
+ |
+LL | let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:45:13
++ --> $DIR/checked_conversions.rs:46:13
+ |
+LL | let _ = value <= i32::max_value() as u32;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:49:13
++ --> $DIR/checked_conversions.rs:47:13
+ |
+LL | let _ = value <= i32::MAX as u32;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:50:13
++ --> $DIR/checked_conversions.rs:51:13
+ |
+LL | let _ = value <= isize::max_value() as usize && value as i32 == 5;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:54:13
++ --> $DIR/checked_conversions.rs:52:13
+ |
+LL | let _ = value <= isize::MAX as usize && value as i32 == 5;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- --> $DIR/checked_conversions.rs:55:13
++ --> $DIR/checked_conversions.rs:56:13
+ |
+LL | let _ = value <= u16::max_value() as u32 && value as i32 == 5;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()`
+
+error: checked cast can be simplified
- error: aborting due to 16 previous errors
++ --> $DIR/checked_conversions.rs:57:13
+ |
+LL | let _ = value <= u16::MAX as u32 && value as i32 == 5;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()`
+
++error: checked cast can be simplified
++ --> $DIR/checked_conversions.rs:92:13
++ |
++LL | let _ = value <= (u32::MAX as i64) && value >= 0;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()`
++
++error: aborting due to 17 previous errors
+
--- /dev/null
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::cloned_instead_of_copied)]
++#![allow(unused)]
+
+fn main() {
+ // yay
+ let _ = [1].iter().copied();
+ let _ = vec!["hi"].iter().copied();
+ let _ = Some(&1).copied();
+ let _ = Box::new([1].iter()).copied();
+ let _ = Box::new(Some(&1)).copied();
+
+ // nay
+ let _ = [String::new()].iter().cloned();
+ let _ = Some(&String::new()).cloned();
+}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let _ = [1].iter().cloned();
++ let _ = Some(&1).cloned();
++}
++
++fn msrv_1_35() {
++ #![clippy::msrv = "1.35"]
++
++ let _ = [1].iter().cloned();
++ let _ = Some(&1).copied(); // Option::copied needs 1.35
++}
++
++fn msrv_1_36() {
++ #![clippy::msrv = "1.36"]
++
++ let _ = [1].iter().copied(); // Iterator::copied needs 1.36
++ let _ = Some(&1).copied();
++}
--- /dev/null
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::cloned_instead_of_copied)]
++#![allow(unused)]
+
+fn main() {
+ // yay
+ let _ = [1].iter().cloned();
+ let _ = vec!["hi"].iter().cloned();
+ let _ = Some(&1).cloned();
+ let _ = Box::new([1].iter()).cloned();
+ let _ = Box::new(Some(&1)).cloned();
+
+ // nay
+ let _ = [String::new()].iter().cloned();
+ let _ = Some(&String::new()).cloned();
+}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let _ = [1].iter().cloned();
++ let _ = Some(&1).cloned();
++}
++
++fn msrv_1_35() {
++ #![clippy::msrv = "1.35"]
++
++ let _ = [1].iter().cloned();
++ let _ = Some(&1).cloned(); // Option::copied needs 1.35
++}
++
++fn msrv_1_36() {
++ #![clippy::msrv = "1.36"]
++
++ let _ = [1].iter().cloned(); // Iterator::copied needs 1.36
++ let _ = Some(&1).cloned();
++}
--- /dev/null
- --> $DIR/cloned_instead_of_copied.rs:6:24
+error: used `cloned` where `copied` could be used instead
- --> $DIR/cloned_instead_of_copied.rs:7:31
++ --> $DIR/cloned_instead_of_copied.rs:9:24
+ |
+LL | let _ = [1].iter().cloned();
+ | ^^^^^^ help: try: `copied`
+ |
+ = note: `-D clippy::cloned-instead-of-copied` implied by `-D warnings`
+
+error: used `cloned` where `copied` could be used instead
- --> $DIR/cloned_instead_of_copied.rs:8:22
++ --> $DIR/cloned_instead_of_copied.rs:10:31
+ |
+LL | let _ = vec!["hi"].iter().cloned();
+ | ^^^^^^ help: try: `copied`
+
+error: used `cloned` where `copied` could be used instead
- --> $DIR/cloned_instead_of_copied.rs:9:34
++ --> $DIR/cloned_instead_of_copied.rs:11:22
+ |
+LL | let _ = Some(&1).cloned();
+ | ^^^^^^ help: try: `copied`
+
+error: used `cloned` where `copied` could be used instead
- --> $DIR/cloned_instead_of_copied.rs:10:32
++ --> $DIR/cloned_instead_of_copied.rs:12:34
+ |
+LL | let _ = Box::new([1].iter()).cloned();
+ | ^^^^^^ help: try: `copied`
+
+error: used `cloned` where `copied` could be used instead
- error: aborting due to 5 previous errors
++ --> $DIR/cloned_instead_of_copied.rs:13:32
+ |
+LL | let _ = Box::new(Some(&1)).cloned();
+ | ^^^^^^ help: try: `copied`
+
++error: used `cloned` where `copied` could be used instead
++ --> $DIR/cloned_instead_of_copied.rs:31:22
++ |
++LL | let _ = Some(&1).cloned(); // Option::copied needs 1.35
++ | ^^^^^^ help: try: `copied`
++
++error: used `cloned` where `copied` could be used instead
++ --> $DIR/cloned_instead_of_copied.rs:37:24
++ |
++LL | let _ = [1].iter().cloned(); // Iterator::copied needs 1.36
++ | ^^^^^^ help: try: `copied`
++
++error: used `cloned` where `copied` could be used instead
++ --> $DIR/cloned_instead_of_copied.rs:38:22
++ |
++LL | let _ = Some(&1).cloned();
++ | ^^^^^^ help: try: `copied`
++
++error: aborting due to 8 previous errors
+
--- /dev/null
+#![warn(clippy::collapsible_match)]
+#![allow(
+ clippy::equatable_if_let,
+ clippy::needless_return,
+ clippy::no_effect,
+ clippy::single_match,
+ clippy::uninlined_format_args
+)]
+
+fn lint_cases(opt_opt: Option<Option<u32>>, res_opt: Result<Option<u32>, String>) {
+ // match without block
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ _ => return,
+ }
+
+ // match with block
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ _ => return,
+ }
+
+ // if let, if let
+ if let Ok(val) = res_opt {
+ if let Some(n) = val {
+ take(n);
+ }
+ }
+
+ // if let else, if let else
+ if let Ok(val) = res_opt {
+ if let Some(n) = val {
+ take(n);
+ } else {
+ return;
+ }
+ } else {
+ return;
+ }
+
+ // if let, match
+ if let Ok(val) = res_opt {
+ match val {
+ Some(n) => foo(n),
+ _ => (),
+ }
+ }
+
+ // match, if let
+ match res_opt {
+ Ok(val) => {
+ if let Some(n) = val {
+ take(n);
+ }
+ },
+ _ => {},
+ }
+
+ // if let else, match
+ if let Ok(val) = res_opt {
+ match val {
+ Some(n) => foo(n),
+ _ => return,
+ }
+ } else {
+ return;
+ }
+
+ // match, if let else
+ match res_opt {
+ Ok(val) => {
+ if let Some(n) = val {
+ take(n);
+ } else {
+ return;
+ }
+ },
+ _ => return,
+ }
+
+ // None in inner match same as outer wild branch
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) => foo(n),
+ None => return,
+ },
+ _ => return,
+ }
+
+ // None in outer match same as inner wild branch
+ match opt_opt {
+ Some(val) => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ None => return,
+ }
+}
+
+fn negative_cases(res_opt: Result<Option<u32>, String>, res_res: Result<Result<u32, String>, String>) {
+ while let Some(x) = make() {
+ if let Some(1) = x {
+ todo!();
+ }
+ }
+ // no wild pattern in outer match
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ Err(_) => return,
+ }
+
+ // inner branch is not wild or None
+ match res_res {
+ Ok(val) => match val {
+ Ok(n) => foo(n),
+ Err(_) => return,
+ },
+ _ => return,
+ }
+
+ // statement before inner match
+ match res_opt {
+ Ok(val) => {
+ "hi buddy";
+ match val {
+ Some(n) => foo(n),
+ _ => return,
+ }
+ },
+ _ => return,
+ }
+
+ // statement after inner match
+ match res_opt {
+ Ok(val) => {
+ match val {
+ Some(n) => foo(n),
+ _ => return,
+ }
+ "hi buddy";
+ },
+ _ => return,
+ }
+
+ // wild branches do not match
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) => foo(n),
+ _ => {
+ "sup";
+ return;
+ },
+ },
+ _ => return,
+ }
+
+ // binding used in if guard
+ match res_opt {
+ Ok(val) if val.is_some() => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ _ => return,
+ }
+
+ // binding used in inner match body
+ match res_opt {
+ Ok(val) => match val {
+ Some(_) => take(val),
+ _ => return,
+ },
+ _ => return,
+ }
+
+ // if guard on inner match
+ {
+ match res_opt {
+ Ok(val) => match val {
+ Some(n) if make() => foo(n),
+ _ => return,
+ },
+ _ => return,
+ }
+ match res_opt {
+ Ok(val) => match val {
+ _ => make(),
+ _ if make() => return,
+ },
+ _ => return,
+ }
+ }
+
+ // differing macro contexts
+ {
+ macro_rules! mac {
+ ($val:ident) => {
+ match $val {
+ Some(n) => foo(n),
+ _ => return,
+ }
+ };
+ }
+ match res_opt {
+ Ok(val) => mac!(val),
+ _ => return,
+ }
+ }
+
+ // OR pattern
+ enum E<T> {
+ A(T),
+ B(T),
+ C(T),
+ };
+ match make::<E<Option<u32>>>() {
+ E::A(val) | E::B(val) => match val {
+ Some(n) => foo(n),
+ _ => return,
+ },
+ _ => return,
+ }
+ match make::<Option<E<u32>>>() {
+ Some(val) => match val {
+ E::A(val) | E::B(val) => foo(val),
+ _ => return,
+ },
+ _ => return,
+ }
+ if let Ok(val) = res_opt {
+ if let Some(n) = val {
+ let _ = || {
+ // usage in closure
+ println!("{:?}", val);
+ };
+ }
+ }
+ let _: &dyn std::any::Any = match &Some(Some(1)) {
+ Some(e) => match e {
+ Some(e) => e,
+ e => e,
+ },
+ // else branch looks the same but the binding is different
+ e => e,
+ };
+}
+
++pub enum Issue9647 {
++ A { a: Option<Option<u8>>, b: () },
++ B,
++}
++
++pub fn test_1(x: Issue9647) {
++ if let Issue9647::A { a, .. } = x {
++ if let Some(u) = a {
++ println!("{u:?}")
++ }
++ }
++}
++
++pub fn test_2(x: Issue9647) {
++ if let Issue9647::A { a: Some(a), .. } = x {
++ if let Some(u) = a {
++ println!("{u}")
++ }
++ }
++}
++
+fn make<T>() -> T {
+ unimplemented!()
+}
+
+fn foo<T, U>(t: T) -> U {
+ unimplemented!()
+}
+
+fn take<T>(t: T) {}
+
+fn main() {}
--- /dev/null
- error: aborting due to 10 previous errors
+error: this `match` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:13:20
+ |
+LL | Ok(val) => match val {
+ | ____________________^
+LL | | Some(n) => foo(n),
+LL | | _ => return,
+LL | | },
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:13:12
+ |
+LL | Ok(val) => match val {
+ | ^^^ replace this binding
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+ = note: `-D clippy::collapsible-match` implied by `-D warnings`
+
+error: this `match` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:22:20
+ |
+LL | Ok(val) => match val {
+ | ____________________^
+LL | | Some(n) => foo(n),
+LL | | _ => return,
+LL | | },
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:22:12
+ |
+LL | Ok(val) => match val {
+ | ^^^ replace this binding
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+
+error: this `if let` can be collapsed into the outer `if let`
+ --> $DIR/collapsible_match.rs:31:9
+ |
+LL | / if let Some(n) = val {
+LL | | take(n);
+LL | | }
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:30:15
+ |
+LL | if let Ok(val) = res_opt {
+ | ^^^ replace this binding
+LL | if let Some(n) = val {
+ | ^^^^^^^ with this pattern
+
+error: this `if let` can be collapsed into the outer `if let`
+ --> $DIR/collapsible_match.rs:38:9
+ |
+LL | / if let Some(n) = val {
+LL | | take(n);
+LL | | } else {
+LL | | return;
+LL | | }
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:37:15
+ |
+LL | if let Ok(val) = res_opt {
+ | ^^^ replace this binding
+LL | if let Some(n) = val {
+ | ^^^^^^^ with this pattern
+
+error: this `match` can be collapsed into the outer `if let`
+ --> $DIR/collapsible_match.rs:49:9
+ |
+LL | / match val {
+LL | | Some(n) => foo(n),
+LL | | _ => (),
+LL | | }
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:48:15
+ |
+LL | if let Ok(val) = res_opt {
+ | ^^^ replace this binding
+LL | match val {
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+
+error: this `if let` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:58:13
+ |
+LL | / if let Some(n) = val {
+LL | | take(n);
+LL | | }
+ | |_____________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:57:12
+ |
+LL | Ok(val) => {
+ | ^^^ replace this binding
+LL | if let Some(n) = val {
+ | ^^^^^^^ with this pattern
+
+error: this `match` can be collapsed into the outer `if let`
+ --> $DIR/collapsible_match.rs:67:9
+ |
+LL | / match val {
+LL | | Some(n) => foo(n),
+LL | | _ => return,
+LL | | }
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:66:15
+ |
+LL | if let Ok(val) = res_opt {
+ | ^^^ replace this binding
+LL | match val {
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+
+error: this `if let` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:78:13
+ |
+LL | / if let Some(n) = val {
+LL | | take(n);
+LL | | } else {
+LL | | return;
+LL | | }
+ | |_____________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:77:12
+ |
+LL | Ok(val) => {
+ | ^^^ replace this binding
+LL | if let Some(n) = val {
+ | ^^^^^^^ with this pattern
+
+error: this `match` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:89:20
+ |
+LL | Ok(val) => match val {
+ | ____________________^
+LL | | Some(n) => foo(n),
+LL | | None => return,
+LL | | },
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:89:12
+ |
+LL | Ok(val) => match val {
+ | ^^^ replace this binding
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+
+error: this `match` can be collapsed into the outer `match`
+ --> $DIR/collapsible_match.rs:98:22
+ |
+LL | Some(val) => match val {
+ | ______________________^
+LL | | Some(n) => foo(n),
+LL | | _ => return,
+LL | | },
+ | |_________^
+ |
+help: the outer pattern can be modified to include the inner pattern
+ --> $DIR/collapsible_match.rs:98:14
+ |
+LL | Some(val) => match val {
+ | ^^^ replace this binding
+LL | Some(n) => foo(n),
+ | ^^^^^^^ with this pattern
+
++error: this `if let` can be collapsed into the outer `if let`
++ --> $DIR/collapsible_match.rs:263:9
++ |
++LL | / if let Some(u) = a {
++LL | | println!("{u:?}")
++LL | | }
++ | |_________^
++ |
++help: the outer pattern can be modified to include the inner pattern
++ --> $DIR/collapsible_match.rs:262:27
++ |
++LL | if let Issue9647::A { a, .. } = x {
++ | ^ replace this binding
++LL | if let Some(u) = a {
++ | ^^^^^^^ with this pattern, prefixed by a:
++
++error: this `if let` can be collapsed into the outer `if let`
++ --> $DIR/collapsible_match.rs:271:9
++ |
++LL | / if let Some(u) = a {
++LL | | println!("{u}")
++LL | | }
++ | |_________^
++ |
++help: the outer pattern can be modified to include the inner pattern
++ --> $DIR/collapsible_match.rs:270:35
++ |
++LL | if let Issue9647::A { a: Some(a), .. } = x {
++ | ^ replace this binding
++LL | if let Some(u) = a {
++ | ^^^^^^^ with this pattern
++
++error: aborting due to 12 previous errors
+
--- /dev/null
--- /dev/null
++fn main() {
++ let x = &1;
++ let _ = &1 < x && x < &10;
++}
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
+#![warn(clippy::default_numeric_fallback)]
+#![allow(
+ unused,
+ clippy::never_loop,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::branches_sharing_code,
+ clippy::match_single_binding,
+ clippy::let_unit_value
+)]
+
+#[macro_use]
+extern crate macro_rules;
+
+mod basic_expr {
+ fn test() {
+ // Should lint unsuffixed literals typed `f64`.
+ let x = 0.12_f64;
+ let x = [1.0_f64, 2.0_f64, 3.0_f64];
+ let x = if true { (1.0_f64, 2.0_f64) } else { (3.0_f64, 4.0_f64) };
+ let x = match 1.0_f64 {
+ _ => 1.0_f64,
+ };
+
+ // Should NOT lint suffixed literals.
+ let x = 0.12_f64;
+
+ // Should NOT lint literals in init expr if `Local` has a type annotation.
+ let x: f64 = 0.1;
+ let x: [f64; 3] = [1., 2., 3.];
+ let x: (f64, f64) = if true { (1., 2.) } else { (3., 4.) };
+ let x: _ = 1.;
++ const X: f32 = 1.;
+ }
+}
+
+mod nested_local {
+ fn test() {
+ let x: _ = {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.0_f64;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1.
+ };
+
+ let x: _ = if true {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.0_f64;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1.
+ } else {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.0_f64;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 2.
+ };
++
++ const X: f32 = {
++ // Should lint this because this literal is not bound to any types.
++ let y = 1.0_f64;
++
++ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
++ 1.
++ };
+ }
+}
+
+mod function_def {
+ fn ret_f64() -> f64 {
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ 1.0_f64
+ }
+
+ fn test() {
+ // Should lint this because return type is inferred to `f64` and NOT bound to a concrete
+ // type.
+ let f = || -> _ { 1.0_f64 };
+
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ let f = || -> f64 { 1.0_f64 };
+ }
+}
+
+mod function_calls {
+ fn concrete_arg(f: f64) {}
+
+ fn generic_arg<T>(t: T) {}
+
+ fn test() {
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ concrete_arg(1.);
+
+ // Should lint this because the argument type is inferred to `f64` and NOT bound to a concrete type.
+ generic_arg(1.0_f64);
+
+ // Should lint this because the argument type is inferred to `f64` and NOT bound to a concrete type.
+ let x: _ = generic_arg(1.0_f64);
+ }
+}
+
+mod struct_ctor {
+ struct ConcreteStruct {
+ x: f64,
+ }
+
+ struct GenericStruct<T> {
+ x: T,
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteStruct { x: 1. };
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ GenericStruct { x: 1.0_f64 };
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ let _ = GenericStruct { x: 1.0_f64 };
+ }
+}
+
+mod enum_ctor {
+ enum ConcreteEnum {
+ X(f64),
+ }
+
+ enum GenericEnum<T> {
+ X(T),
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteEnum::X(1.);
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ GenericEnum::X(1.0_f64);
+ }
+}
+
+mod method_calls {
+ struct StructForMethodCallTest;
+
+ impl StructForMethodCallTest {
+ fn concrete_arg(&self, f: f64) {}
+
+ fn generic_arg<T>(&self, t: T) {}
+ }
+
+ fn test() {
+ let s = StructForMethodCallTest {};
+
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ s.concrete_arg(1.);
+
+ // Should lint this because the argument type is bound to a concrete type.
+ s.generic_arg(1.0_f64);
+ }
+}
+
+mod in_macro {
+ macro_rules! internal_macro {
+ () => {
+ let x = 22.0_f64;
+ };
+ }
+
+ // Should lint in internal macro.
+ fn internal() {
+ internal_macro!();
+ }
+
+ // Should NOT lint in external macro.
+ fn external() {
+ default_numeric_fallback!();
+ }
+}
+
+fn main() {}
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
+#![warn(clippy::default_numeric_fallback)]
+#![allow(
+ unused,
+ clippy::never_loop,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::branches_sharing_code,
+ clippy::match_single_binding,
+ clippy::let_unit_value
+)]
+
+#[macro_use]
+extern crate macro_rules;
+
+mod basic_expr {
+ fn test() {
+ // Should lint unsuffixed literals typed `f64`.
+ let x = 0.12;
+ let x = [1., 2., 3.];
+ let x = if true { (1., 2.) } else { (3., 4.) };
+ let x = match 1. {
+ _ => 1.,
+ };
+
+ // Should NOT lint suffixed literals.
+ let x = 0.12_f64;
+
+ // Should NOT lint literals in init expr if `Local` has a type annotation.
+ let x: f64 = 0.1;
+ let x: [f64; 3] = [1., 2., 3.];
+ let x: (f64, f64) = if true { (1., 2.) } else { (3., 4.) };
+ let x: _ = 1.;
++ const X: f32 = 1.;
+ }
+}
+
+mod nested_local {
+ fn test() {
+ let x: _ = {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1.
+ };
+
+ let x: _ = if true {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1.
+ } else {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1.;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 2.
+ };
++
++ const X: f32 = {
++ // Should lint this because this literal is not bound to any types.
++ let y = 1.;
++
++ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
++ 1.
++ };
+ }
+}
+
+mod function_def {
+ fn ret_f64() -> f64 {
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ 1.
+ }
+
+ fn test() {
+ // Should lint this because return type is inferred to `f64` and NOT bound to a concrete
+ // type.
+ let f = || -> _ { 1. };
+
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ let f = || -> f64 { 1. };
+ }
+}
+
+mod function_calls {
+ fn concrete_arg(f: f64) {}
+
+ fn generic_arg<T>(t: T) {}
+
+ fn test() {
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ concrete_arg(1.);
+
+ // Should lint this because the argument type is inferred to `f64` and NOT bound to a concrete type.
+ generic_arg(1.);
+
+ // Should lint this because the argument type is inferred to `f64` and NOT bound to a concrete type.
+ let x: _ = generic_arg(1.);
+ }
+}
+
+mod struct_ctor {
+ struct ConcreteStruct {
+ x: f64,
+ }
+
+ struct GenericStruct<T> {
+ x: T,
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteStruct { x: 1. };
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ GenericStruct { x: 1. };
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ let _ = GenericStruct { x: 1. };
+ }
+}
+
+mod enum_ctor {
+ enum ConcreteEnum {
+ X(f64),
+ }
+
+ enum GenericEnum<T> {
+ X(T),
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteEnum::X(1.);
+
+ // Should lint this because the field type is inferred to `f64` and NOT bound to a concrete type.
+ GenericEnum::X(1.);
+ }
+}
+
+mod method_calls {
+ struct StructForMethodCallTest;
+
+ impl StructForMethodCallTest {
+ fn concrete_arg(&self, f: f64) {}
+
+ fn generic_arg<T>(&self, t: T) {}
+ }
+
+ fn test() {
+ let s = StructForMethodCallTest {};
+
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ s.concrete_arg(1.);
+
+ // Should lint this because the argument type is bound to a concrete type.
+ s.generic_arg(1.);
+ }
+}
+
+mod in_macro {
+ macro_rules! internal_macro {
+ () => {
+ let x = 22.;
+ };
+ }
+
+ // Should lint in internal macro.
+ fn internal() {
+ internal_macro!();
+ }
+
+ // Should NOT lint in external macro.
+ fn external() {
+ default_numeric_fallback!();
+ }
+}
+
+fn main() {}
--- /dev/null
- --> $DIR/default_numeric_fallback_f64.rs:43:21
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:21:17
+ |
+LL | let x = 0.12;
+ | ^^^^ help: consider adding suffix: `0.12_f64`
+ |
+ = note: `-D clippy::default-numeric-fallback` implied by `-D warnings`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:22:18
+ |
+LL | let x = [1., 2., 3.];
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:22:22
+ |
+LL | let x = [1., 2., 3.];
+ | ^^ help: consider adding suffix: `2.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:22:26
+ |
+LL | let x = [1., 2., 3.];
+ | ^^ help: consider adding suffix: `3.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:23:28
+ |
+LL | let x = if true { (1., 2.) } else { (3., 4.) };
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:23:32
+ |
+LL | let x = if true { (1., 2.) } else { (3., 4.) };
+ | ^^ help: consider adding suffix: `2.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:23:46
+ |
+LL | let x = if true { (1., 2.) } else { (3., 4.) };
+ | ^^ help: consider adding suffix: `3.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:23:50
+ |
+LL | let x = if true { (1., 2.) } else { (3., 4.) };
+ | ^^ help: consider adding suffix: `4.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:24:23
+ |
+LL | let x = match 1. {
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_f64.rs:25:18
+ |
+LL | _ => 1.,
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:51:21
++ --> $DIR/default_numeric_fallback_f64.rs:44:21
+ |
+LL | let y = 1.;
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:57:21
++ --> $DIR/default_numeric_fallback_f64.rs:52:21
+ |
+LL | let y = 1.;
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:69:9
++ --> $DIR/default_numeric_fallback_f64.rs:58:21
+ |
+LL | let y = 1.;
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:75:27
++ --> $DIR/default_numeric_fallback_f64.rs:66:21
++ |
++LL | let y = 1.;
++ | ^^ help: consider adding suffix: `1.0_f64`
++
++error: default numeric fallback might occur
++ --> $DIR/default_numeric_fallback_f64.rs:78:9
+ |
+LL | 1.
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:79:29
++ --> $DIR/default_numeric_fallback_f64.rs:84:27
+ |
+LL | let f = || -> _ { 1. };
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:93:21
++ --> $DIR/default_numeric_fallback_f64.rs:88:29
+ |
+LL | let f = || -> f64 { 1. };
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:96:32
++ --> $DIR/default_numeric_fallback_f64.rs:102:21
+ |
+LL | generic_arg(1.);
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:114:28
++ --> $DIR/default_numeric_fallback_f64.rs:105:32
+ |
+LL | let x: _ = generic_arg(1.);
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:117:36
++ --> $DIR/default_numeric_fallback_f64.rs:123:28
+ |
+LL | GenericStruct { x: 1. };
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:135:24
++ --> $DIR/default_numeric_fallback_f64.rs:126:36
+ |
+LL | let _ = GenericStruct { x: 1. };
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:155:23
++ --> $DIR/default_numeric_fallback_f64.rs:144:24
+ |
+LL | GenericEnum::X(1.);
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_f64.rs:162:21
++ --> $DIR/default_numeric_fallback_f64.rs:164:23
+ |
+LL | s.generic_arg(1.);
+ | ^^ help: consider adding suffix: `1.0_f64`
+
+error: default numeric fallback might occur
- error: aborting due to 23 previous errors
++ --> $DIR/default_numeric_fallback_f64.rs:171:21
+ |
+LL | let x = 22.;
+ | ^^^ help: consider adding suffix: `22.0_f64`
+...
+LL | internal_macro!();
+ | ----------------- in this macro invocation
+ |
+ = note: this error originates in the macro `internal_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
+
++error: aborting due to 24 previous errors
+
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
+#![feature(lint_reasons)]
+#![warn(clippy::default_numeric_fallback)]
+#![allow(
+ unused,
+ clippy::never_loop,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::branches_sharing_code,
+ clippy::let_unit_value
+)]
+
+#[macro_use]
+extern crate macro_rules;
+
+mod basic_expr {
+ fn test() {
+ // Should lint unsuffixed literals typed `i32`.
+ let x = 22_i32;
+ let x = [1_i32, 2_i32, 3_i32];
+ let x = if true { (1_i32, 2_i32) } else { (3_i32, 4_i32) };
+ let x = match 1_i32 {
+ 1_i32 => 1_i32,
+ _ => 2_i32,
+ };
+
+ // Should NOT lint suffixed literals.
+ let x = 22_i32;
+
+ // Should NOT lint literals in init expr if `Local` has a type annotation.
+ let x: [i32; 3] = [1, 2, 3];
+ let x: (i32, i32) = if true { (1, 2) } else { (3, 4) };
+ let x: _ = 1;
++ let x: u64 = 1;
++ const CONST_X: i8 = 1;
+ }
+}
+
+mod nested_local {
+ fn test() {
+ let x: _ = {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1_i32;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1
+ };
+
+ let x: _ = if true {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1_i32;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1
+ } else {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1_i32;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 2
+ };
++
++ const CONST_X: i32 = {
++ // Should lint this because this literal is not bound to any types.
++ let y = 1_i32;
++
++ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
++ 1
++ };
+ }
+}
+
+mod function_def {
+ fn ret_i32() -> i32 {
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ 1_i32
+ }
+
+ fn test() {
+ // Should lint this because return type is inferred to `i32` and NOT bound to a concrete
+ // type.
+ let f = || -> _ { 1_i32 };
+
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ let f = || -> i32 { 1_i32 };
+ }
+}
+
+mod function_calls {
+ fn concrete_arg(x: i32) {}
+
+ fn generic_arg<T>(t: T) {}
+
+ fn test() {
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ concrete_arg(1);
+
+ // Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
+ generic_arg(1_i32);
+
+ // Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
+ let x: _ = generic_arg(1_i32);
+ }
+}
+
+mod struct_ctor {
+ struct ConcreteStruct {
+ x: i32,
+ }
+
+ struct GenericStruct<T> {
+ x: T,
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteStruct { x: 1 };
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ GenericStruct { x: 1_i32 };
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ let _ = GenericStruct { x: 1_i32 };
+ }
+}
+
+mod enum_ctor {
+ enum ConcreteEnum {
+ X(i32),
+ }
+
+ enum GenericEnum<T> {
+ X(T),
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteEnum::X(1);
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ GenericEnum::X(1_i32);
+ }
+}
+
+mod method_calls {
+ struct StructForMethodCallTest;
+
+ impl StructForMethodCallTest {
+ fn concrete_arg(&self, x: i32) {}
+
+ fn generic_arg<T>(&self, t: T) {}
+ }
+
+ fn test() {
+ let s = StructForMethodCallTest {};
+
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ s.concrete_arg(1);
+
+ // Should lint this because the argument type is bound to a concrete type.
+ s.generic_arg(1_i32);
+ }
+}
+
+mod in_macro {
+ macro_rules! internal_macro {
+ () => {
+ let x = 22_i32;
+ };
+ }
+
+ // Should lint in internal macro.
+ fn internal() {
+ internal_macro!();
+ }
+
+ // Should NOT lint in external macro.
+ fn external() {
+ default_numeric_fallback!();
+ }
+}
+
+fn check_expect_suppression() {
+ #[expect(clippy::default_numeric_fallback)]
+ let x = 21;
+}
+
+fn main() {}
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
+#![feature(lint_reasons)]
+#![warn(clippy::default_numeric_fallback)]
+#![allow(
+ unused,
+ clippy::never_loop,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::branches_sharing_code,
+ clippy::let_unit_value
+)]
+
+#[macro_use]
+extern crate macro_rules;
+
+mod basic_expr {
+ fn test() {
+ // Should lint unsuffixed literals typed `i32`.
+ let x = 22;
+ let x = [1, 2, 3];
+ let x = if true { (1, 2) } else { (3, 4) };
+ let x = match 1 {
+ 1 => 1,
+ _ => 2,
+ };
+
+ // Should NOT lint suffixed literals.
+ let x = 22_i32;
+
+ // Should NOT lint literals in init expr if `Local` has a type annotation.
+ let x: [i32; 3] = [1, 2, 3];
+ let x: (i32, i32) = if true { (1, 2) } else { (3, 4) };
+ let x: _ = 1;
++ let x: u64 = 1;
++ const CONST_X: i8 = 1;
+ }
+}
+
+mod nested_local {
+ fn test() {
+ let x: _ = {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1
+ };
+
+ let x: _ = if true {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 1
+ } else {
+ // Should lint this because this literal is not bound to any types.
+ let y = 1;
+
+ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
+ 2
+ };
++
++ const CONST_X: i32 = {
++ // Should lint this because this literal is not bound to any types.
++ let y = 1;
++
++ // Should NOT lint this because this literal is bound to `_` of outer `Local`.
++ 1
++ };
+ }
+}
+
+mod function_def {
+ fn ret_i32() -> i32 {
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ 1
+ }
+
+ fn test() {
+ // Should lint this because return type is inferred to `i32` and NOT bound to a concrete
+ // type.
+ let f = || -> _ { 1 };
+
+ // Even though the output type is specified,
+ // this unsuffixed literal is linted to reduce heuristics and keep codebase simple.
+ let f = || -> i32 { 1 };
+ }
+}
+
+mod function_calls {
+ fn concrete_arg(x: i32) {}
+
+ fn generic_arg<T>(t: T) {}
+
+ fn test() {
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ concrete_arg(1);
+
+ // Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
+ generic_arg(1);
+
+ // Should lint this because the argument type is inferred to `i32` and NOT bound to a concrete type.
+ let x: _ = generic_arg(1);
+ }
+}
+
+mod struct_ctor {
+ struct ConcreteStruct {
+ x: i32,
+ }
+
+ struct GenericStruct<T> {
+ x: T,
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteStruct { x: 1 };
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ GenericStruct { x: 1 };
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ let _ = GenericStruct { x: 1 };
+ }
+}
+
+mod enum_ctor {
+ enum ConcreteEnum {
+ X(i32),
+ }
+
+ enum GenericEnum<T> {
+ X(T),
+ }
+
+ fn test() {
+ // Should NOT lint this because the field type is bound to a concrete type.
+ ConcreteEnum::X(1);
+
+ // Should lint this because the field type is inferred to `i32` and NOT bound to a concrete type.
+ GenericEnum::X(1);
+ }
+}
+
+mod method_calls {
+ struct StructForMethodCallTest;
+
+ impl StructForMethodCallTest {
+ fn concrete_arg(&self, x: i32) {}
+
+ fn generic_arg<T>(&self, t: T) {}
+ }
+
+ fn test() {
+ let s = StructForMethodCallTest {};
+
+ // Should NOT lint this because the argument type is bound to a concrete type.
+ s.concrete_arg(1);
+
+ // Should lint this because the argument type is bound to a concrete type.
+ s.generic_arg(1);
+ }
+}
+
+mod in_macro {
+ macro_rules! internal_macro {
+ () => {
+ let x = 22;
+ };
+ }
+
+ // Should lint in internal macro.
+ fn internal() {
+ internal_macro!();
+ }
+
+ // Should NOT lint in external macro.
+ fn external() {
+ default_numeric_fallback!();
+ }
+}
+
+fn check_expect_suppression() {
+ #[expect(clippy::default_numeric_fallback)]
+ let x = 21;
+}
+
+fn main() {}
--- /dev/null
- --> $DIR/default_numeric_fallback_i32.rs:43:21
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:21:17
+ |
+LL | let x = 22;
+ | ^^ help: consider adding suffix: `22_i32`
+ |
+ = note: `-D clippy::default-numeric-fallback` implied by `-D warnings`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:22:18
+ |
+LL | let x = [1, 2, 3];
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:22:21
+ |
+LL | let x = [1, 2, 3];
+ | ^ help: consider adding suffix: `2_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:22:24
+ |
+LL | let x = [1, 2, 3];
+ | ^ help: consider adding suffix: `3_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:23:28
+ |
+LL | let x = if true { (1, 2) } else { (3, 4) };
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:23:31
+ |
+LL | let x = if true { (1, 2) } else { (3, 4) };
+ | ^ help: consider adding suffix: `2_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:23:44
+ |
+LL | let x = if true { (1, 2) } else { (3, 4) };
+ | ^ help: consider adding suffix: `3_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:23:47
+ |
+LL | let x = if true { (1, 2) } else { (3, 4) };
+ | ^ help: consider adding suffix: `4_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:24:23
+ |
+LL | let x = match 1 {
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:25:13
+ |
+LL | 1 => 1,
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:25:18
+ |
+LL | 1 => 1,
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
+ --> $DIR/default_numeric_fallback_i32.rs:26:18
+ |
+LL | _ => 2,
+ | ^ help: consider adding suffix: `2_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:51:21
++ --> $DIR/default_numeric_fallback_i32.rs:45:21
+ |
+LL | let y = 1;
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:57:21
++ --> $DIR/default_numeric_fallback_i32.rs:53:21
+ |
+LL | let y = 1;
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:69:9
++ --> $DIR/default_numeric_fallback_i32.rs:59:21
+ |
+LL | let y = 1;
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:75:27
++ --> $DIR/default_numeric_fallback_i32.rs:67:21
++ |
++LL | let y = 1;
++ | ^ help: consider adding suffix: `1_i32`
++
++error: default numeric fallback might occur
++ --> $DIR/default_numeric_fallback_i32.rs:79:9
+ |
+LL | 1
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:79:29
++ --> $DIR/default_numeric_fallback_i32.rs:85:27
+ |
+LL | let f = || -> _ { 1 };
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:93:21
++ --> $DIR/default_numeric_fallback_i32.rs:89:29
+ |
+LL | let f = || -> i32 { 1 };
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:96:32
++ --> $DIR/default_numeric_fallback_i32.rs:103:21
+ |
+LL | generic_arg(1);
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:114:28
++ --> $DIR/default_numeric_fallback_i32.rs:106:32
+ |
+LL | let x: _ = generic_arg(1);
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:117:36
++ --> $DIR/default_numeric_fallback_i32.rs:124:28
+ |
+LL | GenericStruct { x: 1 };
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:135:24
++ --> $DIR/default_numeric_fallback_i32.rs:127:36
+ |
+LL | let _ = GenericStruct { x: 1 };
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:155:23
++ --> $DIR/default_numeric_fallback_i32.rs:145:24
+ |
+LL | GenericEnum::X(1);
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- --> $DIR/default_numeric_fallback_i32.rs:162:21
++ --> $DIR/default_numeric_fallback_i32.rs:165:23
+ |
+LL | s.generic_arg(1);
+ | ^ help: consider adding suffix: `1_i32`
+
+error: default numeric fallback might occur
- error: aborting due to 25 previous errors
++ --> $DIR/default_numeric_fallback_i32.rs:172:21
+ |
+LL | let x = 22;
+ | ^^ help: consider adding suffix: `22_i32`
+...
+LL | internal_macro!();
+ | ----------------- in this macro invocation
+ |
+ = note: this error originates in the macro `internal_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
+
++error: aborting due to 26 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![allow(unused)]
++
+struct MyTypeNonDebug;
+
+#[derive(Debug)]
+struct MyTypeDebug;
+
+fn main() {
+ let test_debug: Result<MyTypeDebug, u32> = Ok(MyTypeDebug);
+ test_debug.expect_err("Testing debug type");
+
+ let test_non_debug: Result<MyTypeNonDebug, u32> = Ok(MyTypeNonDebug);
+ test_non_debug.err().expect("Testing non debug type");
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ let x: Result<u32, &str> = Ok(16);
++ x.err().expect("16");
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ let x: Result<u32, &str> = Ok(17);
++ x.expect_err("17");
++}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![allow(unused)]
++
+struct MyTypeNonDebug;
+
+#[derive(Debug)]
+struct MyTypeDebug;
+
+fn main() {
+ let test_debug: Result<MyTypeDebug, u32> = Ok(MyTypeDebug);
+ test_debug.err().expect("Testing debug type");
+
+ let test_non_debug: Result<MyTypeNonDebug, u32> = Ok(MyTypeNonDebug);
+ test_non_debug.err().expect("Testing non debug type");
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ let x: Result<u32, &str> = Ok(16);
++ x.err().expect("16");
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ let x: Result<u32, &str> = Ok(17);
++ x.err().expect("17");
++}
--- /dev/null
- --> $DIR/err_expect.rs:10:16
+error: called `.err().expect()` on a `Result` value
- error: aborting due to previous error
++ --> $DIR/err_expect.rs:13:16
+ |
+LL | test_debug.err().expect("Testing debug type");
+ | ^^^^^^^^^^^^ help: try: `expect_err`
+ |
+ = note: `-D clippy::err-expect` implied by `-D warnings`
+
++error: called `.err().expect()` on a `Result` value
++ --> $DIR/err_expect.rs:30:7
++ |
++LL | x.err().expect("17");
++ | ^^^^^^^^^^^^ help: try: `expect_err`
++
++error: aborting due to 2 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::all, clippy::pedantic)]
++#![allow(unused)]
+
+fn main() {
+ let a = ["1", "lol", "3", "NaN", "5"];
+
+ let element: Option<i32> = a.iter().find_map(|s| s.parse().ok());
+ assert_eq!(element, Some(1));
+}
++
++fn msrv_1_29() {
++ #![clippy::msrv = "1.29"]
++
++ let a = ["1", "lol", "3", "NaN", "5"];
++ let _: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
++}
++
++fn msrv_1_30() {
++ #![clippy::msrv = "1.30"]
++
++ let a = ["1", "lol", "3", "NaN", "5"];
++ let _: Option<i32> = a.iter().find_map(|s| s.parse().ok());
++}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::all, clippy::pedantic)]
++#![allow(unused)]
+
+fn main() {
+ let a = ["1", "lol", "3", "NaN", "5"];
+
+ let element: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
+ assert_eq!(element, Some(1));
+}
++
++fn msrv_1_29() {
++ #![clippy::msrv = "1.29"]
++
++ let a = ["1", "lol", "3", "NaN", "5"];
++ let _: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
++}
++
++fn msrv_1_30() {
++ #![clippy::msrv = "1.30"]
++
++ let a = ["1", "lol", "3", "NaN", "5"];
++ let _: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
++}
--- /dev/null
- --> $DIR/filter_map_next_fixable.rs:8:32
+error: called `filter_map(..).next()` on an `Iterator`. This is more succinctly expressed by calling `.find_map(..)` instead
- error: aborting due to previous error
++ --> $DIR/filter_map_next_fixable.rs:10:32
+ |
+LL | let element: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `a.iter().find_map(|s| s.parse().ok())`
+ |
+ = note: `-D clippy::filter-map-next` implied by `-D warnings`
+
++error: called `filter_map(..).next()` on an `Iterator`. This is more succinctly expressed by calling `.find_map(..)` instead
++ --> $DIR/filter_map_next_fixable.rs:25:26
++ |
++LL | let _: Option<i32> = a.iter().filter_map(|s| s.parse().ok()).next();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `a.iter().find_map(|s| s.parse().ok())`
++
++error: aborting due to 2 previous errors
+
--- /dev/null
+// run-rustfix
+#![warn(clippy::to_string_in_format_args)]
+#![allow(unused)]
+#![allow(
+ clippy::assertions_on_constants,
++ clippy::double_parens,
+ clippy::eq_op,
+ clippy::print_literal,
+ clippy::uninlined_format_args
+)]
+
+use std::io::{stdout, Write};
+use std::ops::Deref;
+use std::panic::Location;
+
+struct Somewhere;
+
+impl ToString for Somewhere {
+ fn to_string(&self) -> String {
+ String::from("somewhere")
+ }
+}
+
+struct X(u32);
+
+impl Deref for X {
+ type Target = u32;
+
+ fn deref(&self) -> &u32 {
+ &self.0
+ }
+}
+
+struct Y<'a>(&'a X);
+
+impl<'a> Deref for Y<'a> {
+ type Target = &'a X;
+
+ fn deref(&self) -> &Self::Target {
+ &self.0
+ }
+}
+
+struct Z(u32);
+
+impl Deref for Z {
+ type Target = u32;
+
+ fn deref(&self) -> &u32 {
+ &self.0
+ }
+}
+
+impl std::fmt::Display for Z {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ write!(f, "Z")
+ }
+}
+
+macro_rules! my_macro {
+ () => {
+ // here be dragons, do not enter (or lint)
+ println!("error: something failed at {}", Location::caller().to_string());
+ };
+}
+
+macro_rules! my_other_macro {
+ () => {
+ Location::caller().to_string()
+ };
+}
+
+fn main() {
+ let x = &X(1);
+ let x_ref = &x;
+
+ let _ = format!("error: something failed at {}", Location::caller());
+ let _ = write!(
+ stdout(),
+ "error: something failed at {}",
+ Location::caller()
+ );
+ let _ = writeln!(
+ stdout(),
+ "error: something failed at {}",
+ Location::caller()
+ );
+ print!("error: something failed at {}", Location::caller());
+ println!("error: something failed at {}", Location::caller());
+ eprint!("error: something failed at {}", Location::caller());
+ eprintln!("error: something failed at {}", Location::caller());
+ let _ = format_args!("error: something failed at {}", Location::caller());
+ assert!(true, "error: something failed at {}", Location::caller());
+ assert_eq!(0, 0, "error: something failed at {}", Location::caller());
+ assert_ne!(0, 0, "error: something failed at {}", Location::caller());
+ panic!("error: something failed at {}", Location::caller());
+ println!("{}", *X(1));
+ println!("{}", ***Y(&X(1)));
+ println!("{}", Z(1));
+ println!("{}", **x);
+ println!("{}", ***x_ref);
+ // https://github.com/rust-lang/rust-clippy/issues/7903
+ println!("{foo}{bar}", foo = "foo", bar = "bar");
+ println!("{foo}{bar}", foo = "foo", bar = "bar");
+ println!("{foo}{bar}", bar = "bar", foo = "foo");
+ println!("{foo}{bar}", bar = "bar", foo = "foo");
+
+ // negative tests
+ println!("error: something failed at {}", Somewhere.to_string());
+ // The next two tests are negative because caching the string might be faster than calling `<X as
+ // Display>::fmt` twice.
+ println!("{} and again {0}", x.to_string());
+ println!("{foo}{foo}", foo = "foo".to_string());
+ my_macro!();
+ println!("error: something failed at {}", my_other_macro!());
+ // https://github.com/rust-lang/rust-clippy/issues/7903
+ println!("{foo}{foo:?}", foo = "foo".to_string());
++ print!("{}", (Location::caller()));
++ print!("{}", ((Location::caller())));
+}
+
+fn issue8643(vendor_id: usize, product_id: usize, name: &str) {
+ println!(
+ "{:<9} {:<10} {}",
+ format!("0x{:x}", vendor_id),
+ format!("0x{:x}", product_id),
+ name
+ );
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8855
+mod issue_8855 {
+ #![allow(dead_code)]
+
+ struct A {}
+
+ impl std::fmt::Display for A {
+ fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+ write!(f, "test")
+ }
+ }
+
+ fn main() {
+ let a = A {};
+ let b = A {};
+
+ let x = format!("{} {}", a, b);
+ dbg!(x);
+
+ let x = format!("{:>6} {:>6}", a, b.to_string());
+ dbg!(x);
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/9256
+mod issue_9256 {
+ #![allow(dead_code)]
+
+ fn print_substring(original: &str) {
+ assert!(original.len() > 10);
+ println!("{}", &original[..10]);
+ }
+
+ fn main() {
+ print_substring("Hello, world!");
+ }
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::to_string_in_format_args)]
+#![allow(unused)]
+#![allow(
+ clippy::assertions_on_constants,
++ clippy::double_parens,
+ clippy::eq_op,
+ clippy::print_literal,
+ clippy::uninlined_format_args
+)]
+
+use std::io::{stdout, Write};
+use std::ops::Deref;
+use std::panic::Location;
+
+struct Somewhere;
+
+impl ToString for Somewhere {
+ fn to_string(&self) -> String {
+ String::from("somewhere")
+ }
+}
+
+struct X(u32);
+
+impl Deref for X {
+ type Target = u32;
+
+ fn deref(&self) -> &u32 {
+ &self.0
+ }
+}
+
+struct Y<'a>(&'a X);
+
+impl<'a> Deref for Y<'a> {
+ type Target = &'a X;
+
+ fn deref(&self) -> &Self::Target {
+ &self.0
+ }
+}
+
+struct Z(u32);
+
+impl Deref for Z {
+ type Target = u32;
+
+ fn deref(&self) -> &u32 {
+ &self.0
+ }
+}
+
+impl std::fmt::Display for Z {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ write!(f, "Z")
+ }
+}
+
+macro_rules! my_macro {
+ () => {
+ // here be dragons, do not enter (or lint)
+ println!("error: something failed at {}", Location::caller().to_string());
+ };
+}
+
+macro_rules! my_other_macro {
+ () => {
+ Location::caller().to_string()
+ };
+}
+
+fn main() {
+ let x = &X(1);
+ let x_ref = &x;
+
+ let _ = format!("error: something failed at {}", Location::caller().to_string());
+ let _ = write!(
+ stdout(),
+ "error: something failed at {}",
+ Location::caller().to_string()
+ );
+ let _ = writeln!(
+ stdout(),
+ "error: something failed at {}",
+ Location::caller().to_string()
+ );
+ print!("error: something failed at {}", Location::caller().to_string());
+ println!("error: something failed at {}", Location::caller().to_string());
+ eprint!("error: something failed at {}", Location::caller().to_string());
+ eprintln!("error: something failed at {}", Location::caller().to_string());
+ let _ = format_args!("error: something failed at {}", Location::caller().to_string());
+ assert!(true, "error: something failed at {}", Location::caller().to_string());
+ assert_eq!(0, 0, "error: something failed at {}", Location::caller().to_string());
+ assert_ne!(0, 0, "error: something failed at {}", Location::caller().to_string());
+ panic!("error: something failed at {}", Location::caller().to_string());
+ println!("{}", X(1).to_string());
+ println!("{}", Y(&X(1)).to_string());
+ println!("{}", Z(1).to_string());
+ println!("{}", x.to_string());
+ println!("{}", x_ref.to_string());
+ // https://github.com/rust-lang/rust-clippy/issues/7903
+ println!("{foo}{bar}", foo = "foo".to_string(), bar = "bar");
+ println!("{foo}{bar}", foo = "foo", bar = "bar".to_string());
+ println!("{foo}{bar}", bar = "bar".to_string(), foo = "foo");
+ println!("{foo}{bar}", bar = "bar", foo = "foo".to_string());
+
+ // negative tests
+ println!("error: something failed at {}", Somewhere.to_string());
+ // The next two tests are negative because caching the string might be faster than calling `<X as
+ // Display>::fmt` twice.
+ println!("{} and again {0}", x.to_string());
+ println!("{foo}{foo}", foo = "foo".to_string());
+ my_macro!();
+ println!("error: something failed at {}", my_other_macro!());
+ // https://github.com/rust-lang/rust-clippy/issues/7903
+ println!("{foo}{foo:?}", foo = "foo".to_string());
++ print!("{}", (Location::caller().to_string()));
++ print!("{}", ((Location::caller()).to_string()));
+}
+
+fn issue8643(vendor_id: usize, product_id: usize, name: &str) {
+ println!(
+ "{:<9} {:<10} {}",
+ format!("0x{:x}", vendor_id),
+ format!("0x{:x}", product_id),
+ name
+ );
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8855
+mod issue_8855 {
+ #![allow(dead_code)]
+
+ struct A {}
+
+ impl std::fmt::Display for A {
+ fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+ write!(f, "test")
+ }
+ }
+
+ fn main() {
+ let a = A {};
+ let b = A {};
+
+ let x = format!("{} {}", a, b.to_string());
+ dbg!(x);
+
+ let x = format!("{:>6} {:>6}", a, b.to_string());
+ dbg!(x);
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/9256
+mod issue_9256 {
+ #![allow(dead_code)]
+
+ fn print_substring(original: &str) {
+ assert!(original.len() > 10);
+ println!("{}", original[..10].to_string());
+ }
+
+ fn main() {
+ print_substring("Hello, world!");
+ }
+}
--- /dev/null
- --> $DIR/format_args.rs:76:72
+error: `to_string` applied to a type that implements `Display` in `format!` args
- --> $DIR/format_args.rs:80:27
++ --> $DIR/format_args.rs:77:72
+ |
+LL | let _ = format!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+ |
+ = note: `-D clippy::to-string-in-format-args` implied by `-D warnings`
+
+error: `to_string` applied to a type that implements `Display` in `write!` args
- --> $DIR/format_args.rs:85:27
++ --> $DIR/format_args.rs:81:27
+ |
+LL | Location::caller().to_string()
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `writeln!` args
- --> $DIR/format_args.rs:87:63
++ --> $DIR/format_args.rs:86:27
+ |
+LL | Location::caller().to_string()
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `print!` args
- --> $DIR/format_args.rs:88:65
++ --> $DIR/format_args.rs:88:63
+ |
+LL | print!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:89:64
++ --> $DIR/format_args.rs:89:65
+ |
+LL | println!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `eprint!` args
- --> $DIR/format_args.rs:90:66
++ --> $DIR/format_args.rs:90:64
+ |
+LL | eprint!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `eprintln!` args
- --> $DIR/format_args.rs:91:77
++ --> $DIR/format_args.rs:91:66
+ |
+LL | eprintln!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `format_args!` args
- --> $DIR/format_args.rs:92:70
++ --> $DIR/format_args.rs:92:77
+ |
+LL | let _ = format_args!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `assert!` args
- --> $DIR/format_args.rs:93:73
++ --> $DIR/format_args.rs:93:70
+ |
+LL | assert!(true, "error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `assert_eq!` args
- --> $DIR/format_args.rs:94:73
++ --> $DIR/format_args.rs:94:73
+ |
+LL | assert_eq!(0, 0, "error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `assert_ne!` args
- --> $DIR/format_args.rs:95:63
++ --> $DIR/format_args.rs:95:73
+ |
+LL | assert_ne!(0, 0, "error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `panic!` args
- --> $DIR/format_args.rs:96:20
++ --> $DIR/format_args.rs:96:63
+ |
+LL | panic!("error: something failed at {}", Location::caller().to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:97:20
++ --> $DIR/format_args.rs:97:20
+ |
+LL | println!("{}", X(1).to_string());
+ | ^^^^^^^^^^^^^^^^ help: use this: `*X(1)`
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:98:24
++ --> $DIR/format_args.rs:98:20
+ |
+LL | println!("{}", Y(&X(1)).to_string());
+ | ^^^^^^^^^^^^^^^^^^^^ help: use this: `***Y(&X(1))`
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:99:20
++ --> $DIR/format_args.rs:99:24
+ |
+LL | println!("{}", Z(1).to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:100:20
++ --> $DIR/format_args.rs:100:20
+ |
+LL | println!("{}", x.to_string());
+ | ^^^^^^^^^^^^^ help: use this: `**x`
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:102:39
++ --> $DIR/format_args.rs:101:20
+ |
+LL | println!("{}", x_ref.to_string());
+ | ^^^^^^^^^^^^^^^^^ help: use this: `***x_ref`
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:103:52
++ --> $DIR/format_args.rs:103:39
+ |
+LL | println!("{foo}{bar}", foo = "foo".to_string(), bar = "bar");
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:104:39
++ --> $DIR/format_args.rs:104:52
+ |
+LL | println!("{foo}{bar}", foo = "foo", bar = "bar".to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:105:52
++ --> $DIR/format_args.rs:105:39
+ |
+LL | println!("{foo}{bar}", bar = "bar".to_string(), foo = "foo");
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- --> $DIR/format_args.rs:144:38
++ --> $DIR/format_args.rs:106:52
+ |
+LL | println!("{foo}{bar}", bar = "bar", foo = "foo".to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
++error: `to_string` applied to a type that implements `Display` in `print!` args
++ --> $DIR/format_args.rs:118:37
++ |
++LL | print!("{}", (Location::caller().to_string()));
++ | ^^^^^^^^^^^^ help: remove this
++
++error: `to_string` applied to a type that implements `Display` in `print!` args
++ --> $DIR/format_args.rs:119:39
++ |
++LL | print!("{}", ((Location::caller()).to_string()));
++ | ^^^^^^^^^^^^ help: remove this
++
+error: `to_string` applied to a type that implements `Display` in `format!` args
- --> $DIR/format_args.rs:158:24
++ --> $DIR/format_args.rs:147:38
+ |
+LL | let x = format!("{} {}", a, b.to_string());
+ | ^^^^^^^^^^^^ help: remove this
+
+error: `to_string` applied to a type that implements `Display` in `println!` args
- error: aborting due to 23 previous errors
++ --> $DIR/format_args.rs:161:24
+ |
+LL | println!("{}", original[..10].to_string());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use this: `&original[..10]`
+
++error: aborting due to 25 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![feature(custom_inner_attributes)]
++#![warn(clippy::from_over_into)]
++#![allow(unused)]
++
++// this should throw an error
++struct StringWrapper(String);
++
++impl From<String> for StringWrapper {
++ fn from(val: String) -> Self {
++ StringWrapper(val)
++ }
++}
++
++struct SelfType(String);
++
++impl From<String> for SelfType {
++ fn from(val: String) -> Self {
++ SelfType(String::new())
++ }
++}
++
++#[derive(Default)]
++struct X;
++
++impl X {
++ const FOO: &'static str = "a";
++}
++
++struct SelfKeywords;
++
++impl From<X> for SelfKeywords {
++ fn from(val: X) -> Self {
++ let _ = X::default();
++ let _ = X::FOO;
++ let _: X = val;
++
++ SelfKeywords
++ }
++}
++
++struct ExplicitPaths(bool);
++
++impl core::convert::From<crate::ExplicitPaths> for bool {
++ fn from(mut val: crate::ExplicitPaths) -> Self {
++ let in_closure = || val.0;
++
++ val.0 = false;
++ val.0
++ }
++}
++
++// this is fine
++struct A(String);
++
++impl From<String> for A {
++ fn from(s: String) -> A {
++ A(s)
++ }
++}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ struct FromOverInto<T>(Vec<T>);
++
++ impl<T> Into<FromOverInto<T>> for Vec<T> {
++ fn into(self) -> FromOverInto<T> {
++ FromOverInto(self)
++ }
++ }
++}
++
++fn msrv_1_41() {
++ #![clippy::msrv = "1.41"]
++
++ struct FromOverInto<T>(Vec<T>);
++
++ impl<T> From<Vec<T>> for FromOverInto<T> {
++ fn from(val: Vec<T>) -> Self {
++ FromOverInto(val)
++ }
++ }
++}
++
++fn main() {}
--- /dev/null
++// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::from_over_into)]
++#![allow(unused)]
+
+// this should throw an error
+struct StringWrapper(String);
+
+impl Into<StringWrapper> for String {
+ fn into(self) -> StringWrapper {
+ StringWrapper(self)
+ }
+}
+
++struct SelfType(String);
++
++impl Into<SelfType> for String {
++ fn into(self) -> SelfType {
++ SelfType(Self::new())
++ }
++}
++
++#[derive(Default)]
++struct X;
++
++impl X {
++ const FOO: &'static str = "a";
++}
++
++struct SelfKeywords;
++
++impl Into<SelfKeywords> for X {
++ fn into(self) -> SelfKeywords {
++ let _ = Self::default();
++ let _ = Self::FOO;
++ let _: Self = self;
++
++ SelfKeywords
++ }
++}
++
++struct ExplicitPaths(bool);
++
++impl core::convert::Into<bool> for crate::ExplicitPaths {
++ fn into(mut self) -> bool {
++ let in_closure = || self.0;
++
++ self.0 = false;
++ self.0
++ }
++}
++
+// this is fine
+struct A(String);
+
+impl From<String> for A {
+ fn from(s: String) -> A {
+ A(s)
+ }
+}
+
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ struct FromOverInto<T>(Vec<T>);
++
++ impl<T> Into<FromOverInto<T>> for Vec<T> {
++ fn into(self) -> FromOverInto<T> {
++ FromOverInto(self)
++ }
++ }
++}
++
++fn msrv_1_41() {
++ #![clippy::msrv = "1.41"]
++
++ struct FromOverInto<T>(Vec<T>);
++
++ impl<T> Into<FromOverInto<T>> for Vec<T> {
++ fn into(self) -> FromOverInto<T> {
++ FromOverInto(self)
++ }
++ }
++}
++
+fn main() {}
--- /dev/null
- --> $DIR/from_over_into.rs:6:1
+error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
- = help: consider to implement `From<std::string::String>` instead
++ --> $DIR/from_over_into.rs:10:1
+ |
+LL | impl Into<StringWrapper> for String {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
- error: aborting due to previous error
+ = note: `-D clippy::from-over-into` implied by `-D warnings`
++help: replace the `Into` implentation with `From<std::string::String>`
++ |
++LL ~ impl From<String> for StringWrapper {
++LL ~ fn from(val: String) -> Self {
++LL ~ StringWrapper(val)
++ |
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into.rs:18:1
++ |
++LL | impl Into<SelfType> for String {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: replace the `Into` implentation with `From<std::string::String>`
++ |
++LL ~ impl From<String> for SelfType {
++LL ~ fn from(val: String) -> Self {
++LL ~ SelfType(String::new())
++ |
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into.rs:33:1
++ |
++LL | impl Into<SelfKeywords> for X {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: replace the `Into` implentation with `From<X>`
++ |
++LL ~ impl From<X> for SelfKeywords {
++LL ~ fn from(val: X) -> Self {
++LL ~ let _ = X::default();
++LL ~ let _ = X::FOO;
++LL ~ let _: X = val;
++ |
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into.rs:45:1
++ |
++LL | impl core::convert::Into<bool> for crate::ExplicitPaths {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: `impl From<Local> for Foreign` is allowed by the orphan rules, for more information see
++ https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence
++help: replace the `Into` implentation with `From<ExplicitPaths>`
++ |
++LL ~ impl core::convert::From<crate::ExplicitPaths> for bool {
++LL ~ fn from(mut val: crate::ExplicitPaths) -> Self {
++LL ~ let in_closure = || val.0;
++LL |
++LL ~ val.0 = false;
++LL ~ val.0
++ |
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into.rs:80:5
++ |
++LL | impl<T> Into<FromOverInto<T>> for Vec<T> {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: replace the `Into` implentation with `From<std::vec::Vec<T>>`
++ |
++LL ~ impl<T> From<Vec<T>> for FromOverInto<T> {
++LL ~ fn from(val: Vec<T>) -> Self {
++LL ~ FromOverInto(val)
++ |
+
++error: aborting due to 5 previous errors
+
--- /dev/null
--- /dev/null
++#![warn(clippy::from_over_into)]
++
++struct InMacro(String);
++
++macro_rules! in_macro {
++ ($e:ident) => {
++ $e
++ };
++}
++
++impl Into<InMacro> for String {
++ fn into(self) -> InMacro {
++ InMacro(in_macro!(self))
++ }
++}
++
++struct WeirdUpperSelf;
++
++impl Into<WeirdUpperSelf> for &'static [u8] {
++ fn into(self) -> WeirdUpperSelf {
++ let _ = Self::default();
++ WeirdUpperSelf
++ }
++}
++
++struct ContainsVal;
++
++impl Into<u8> for ContainsVal {
++ fn into(self) -> u8 {
++ let val = 1;
++ val + 1
++ }
++}
++
++fn main() {}
--- /dev/null
--- /dev/null
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into_unfixable.rs:11:1
++ |
++LL | impl Into<InMacro> for String {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: replace the `Into` implentation with `From<std::string::String>`
++ = note: `-D clippy::from-over-into` implied by `-D warnings`
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into_unfixable.rs:19:1
++ |
++LL | impl Into<WeirdUpperSelf> for &'static [u8] {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: replace the `Into` implentation with `From<&'static [u8]>`
++
++error: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
++ --> $DIR/from_over_into_unfixable.rs:28:1
++ |
++LL | impl Into<u8> for ContainsVal {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: `impl From<Local> for Foreign` is allowed by the orphan rules, for more information see
++ https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence
++ = help: replace the `Into` implentation with `From<ContainsVal>`
++
++error: aborting due to 3 previous errors
++
--- /dev/null
+// run-rustfix
+#![allow(unused_assignments, unused_mut, clippy::assign_op_pattern)]
+#![warn(clippy::implicit_saturating_sub)]
+
++use std::cmp::PartialEq;
++use std::ops::SubAssign;
++// Mock type
++struct Mock;
++
++impl PartialEq<u32> for Mock {
++ fn eq(&self, _: &u32) -> bool {
++ true
++ }
++}
++
++impl SubAssign<u32> for Mock {
++ fn sub_assign(&mut self, _: u32) {}
++}
++
+fn main() {
+ // Tests for unsigned integers
+
+ let end_8: u8 = 10;
+ let start_8: u8 = 5;
+ let mut u_8: u8 = end_8 - start_8;
+
+ // Lint
+ u_8 = u_8.saturating_sub(1);
+
+ match end_8 {
+ 10 => {
+ // Lint
+ u_8 = u_8.saturating_sub(1);
+ },
+ 11 => u_8 += 1,
+ _ => u_8 = 0,
+ }
+
+ let end_16: u16 = 40;
+ let start_16: u16 = 35;
+
+ let mut u_16: u16 = end_16 - start_16;
+
+ // Lint
+ u_16 = u_16.saturating_sub(1);
+
+ let mut end_32: u32 = 7010;
+ let mut start_32: u32 = 7000;
+
+ let mut u_32: u32 = end_32 - start_32;
+
+ // Lint
+ u_32 = u_32.saturating_sub(1);
+
+ // No Lint
+ if u_32 > 0 {
+ u_16 += 1;
+ }
+
+ // No Lint
+ if u_32 != 0 {
+ end_32 -= 1;
+ start_32 += 1;
+ }
+
+ let mut end_64: u64 = 75001;
+ let mut start_64: u64 = 75000;
+
+ let mut u_64: u64 = end_64 - start_64;
+
+ // Lint
+ u_64 = u_64.saturating_sub(1);
+
+ // Lint
+ u_64 = u_64.saturating_sub(1);
+
+ // Lint
+ u_64 = u_64.saturating_sub(1);
+
+ // No Lint
+ if u_64 >= 1 {
+ u_64 -= 1;
+ }
+
+ // No Lint
+ if u_64 > 0 {
+ end_64 -= 1;
+ }
+
+ // Tests for usize
+ let end_usize: usize = 8054;
+ let start_usize: usize = 8050;
+
+ let mut u_usize: usize = end_usize - start_usize;
+
+ // Lint
+ u_usize = u_usize.saturating_sub(1);
+
+ // Tests for signed integers
+
+ let endi_8: i8 = 10;
+ let starti_8: i8 = 50;
+
+ let mut i_8: i8 = endi_8 - starti_8;
+
+ // Lint
+ i_8 = i_8.saturating_sub(1);
+
+ // Lint
+ i_8 = i_8.saturating_sub(1);
+
+ // Lint
+ i_8 = i_8.saturating_sub(1);
+
+ // Lint
+ i_8 = i_8.saturating_sub(1);
+
+ let endi_16: i16 = 45;
+ let starti_16: i16 = 44;
+
+ let mut i_16: i16 = endi_16 - starti_16;
+
+ // Lint
+ i_16 = i_16.saturating_sub(1);
+
+ // Lint
+ i_16 = i_16.saturating_sub(1);
+
+ // Lint
+ i_16 = i_16.saturating_sub(1);
+
+ // Lint
+ i_16 = i_16.saturating_sub(1);
+
+ let endi_32: i32 = 45;
+ let starti_32: i32 = 44;
+
+ let mut i_32: i32 = endi_32 - starti_32;
+
+ // Lint
+ i_32 = i_32.saturating_sub(1);
+
+ // Lint
+ i_32 = i_32.saturating_sub(1);
+
+ // Lint
+ i_32 = i_32.saturating_sub(1);
+
+ // Lint
+ i_32 = i_32.saturating_sub(1);
+
+ let endi_64: i64 = 45;
+ let starti_64: i64 = 44;
+
+ let mut i_64: i64 = endi_64 - starti_64;
+
+ // Lint
+ i_64 = i_64.saturating_sub(1);
+
+ // Lint
+ i_64 = i_64.saturating_sub(1);
+
+ // Lint
+ i_64 = i_64.saturating_sub(1);
+
+ // No Lint
+ if i_64 > 0 {
+ i_64 -= 1;
+ }
+
+ // No Lint
+ if i_64 != 0 {
+ i_64 -= 1;
+ }
+
+ // issue #7831
+ // No Lint
+ if u_32 > 0 {
+ u_32 -= 1;
+ } else {
+ println!("side effect");
+ }
++
++ // Extended tests
++ let mut m = Mock;
++ let mut u_32 = 3000;
++ let a = 200;
++ let mut _b = 8;
++
++ if m != 0 {
++ m -= 1;
++ }
++
++ if a > 0 {
++ _b -= 1;
++ }
++
++ if 0 > a {
++ _b -= 1;
++ }
++
++ if u_32 > 0 {
++ u_32 -= 1;
++ } else {
++ println!("don't lint this");
++ }
++
++ if u_32 > 0 {
++ println!("don't lint this");
++ u_32 -= 1;
++ }
++
++ if u_32 > 42 {
++ println!("brace yourself!");
++ } else if u_32 > 0 {
++ u_32 -= 1;
++ }
+}
--- /dev/null
+// run-rustfix
+#![allow(unused_assignments, unused_mut, clippy::assign_op_pattern)]
+#![warn(clippy::implicit_saturating_sub)]
+
++use std::cmp::PartialEq;
++use std::ops::SubAssign;
++// Mock type
++struct Mock;
++
++impl PartialEq<u32> for Mock {
++ fn eq(&self, _: &u32) -> bool {
++ true
++ }
++}
++
++impl SubAssign<u32> for Mock {
++ fn sub_assign(&mut self, _: u32) {}
++}
++
+fn main() {
+ // Tests for unsigned integers
+
+ let end_8: u8 = 10;
+ let start_8: u8 = 5;
+ let mut u_8: u8 = end_8 - start_8;
+
+ // Lint
+ if u_8 > 0 {
+ u_8 = u_8 - 1;
+ }
+
+ match end_8 {
+ 10 => {
+ // Lint
+ if u_8 > 0 {
+ u_8 -= 1;
+ }
+ },
+ 11 => u_8 += 1,
+ _ => u_8 = 0,
+ }
+
+ let end_16: u16 = 40;
+ let start_16: u16 = 35;
+
+ let mut u_16: u16 = end_16 - start_16;
+
+ // Lint
+ if u_16 > 0 {
+ u_16 -= 1;
+ }
+
+ let mut end_32: u32 = 7010;
+ let mut start_32: u32 = 7000;
+
+ let mut u_32: u32 = end_32 - start_32;
+
+ // Lint
+ if u_32 != 0 {
+ u_32 -= 1;
+ }
+
+ // No Lint
+ if u_32 > 0 {
+ u_16 += 1;
+ }
+
+ // No Lint
+ if u_32 != 0 {
+ end_32 -= 1;
+ start_32 += 1;
+ }
+
+ let mut end_64: u64 = 75001;
+ let mut start_64: u64 = 75000;
+
+ let mut u_64: u64 = end_64 - start_64;
+
+ // Lint
+ if u_64 > 0 {
+ u_64 -= 1;
+ }
+
+ // Lint
+ if 0 < u_64 {
+ u_64 -= 1;
+ }
+
+ // Lint
+ if 0 != u_64 {
+ u_64 -= 1;
+ }
+
+ // No Lint
+ if u_64 >= 1 {
+ u_64 -= 1;
+ }
+
+ // No Lint
+ if u_64 > 0 {
+ end_64 -= 1;
+ }
+
+ // Tests for usize
+ let end_usize: usize = 8054;
+ let start_usize: usize = 8050;
+
+ let mut u_usize: usize = end_usize - start_usize;
+
+ // Lint
+ if u_usize > 0 {
+ u_usize -= 1;
+ }
+
+ // Tests for signed integers
+
+ let endi_8: i8 = 10;
+ let starti_8: i8 = 50;
+
+ let mut i_8: i8 = endi_8 - starti_8;
+
+ // Lint
+ if i_8 > i8::MIN {
+ i_8 -= 1;
+ }
+
+ // Lint
+ if i_8 > i8::MIN {
+ i_8 -= 1;
+ }
+
+ // Lint
+ if i_8 != i8::MIN {
+ i_8 -= 1;
+ }
+
+ // Lint
+ if i_8 != i8::MIN {
+ i_8 -= 1;
+ }
+
+ let endi_16: i16 = 45;
+ let starti_16: i16 = 44;
+
+ let mut i_16: i16 = endi_16 - starti_16;
+
+ // Lint
+ if i_16 > i16::MIN {
+ i_16 -= 1;
+ }
+
+ // Lint
+ if i_16 > i16::MIN {
+ i_16 -= 1;
+ }
+
+ // Lint
+ if i_16 != i16::MIN {
+ i_16 -= 1;
+ }
+
+ // Lint
+ if i_16 != i16::MIN {
+ i_16 -= 1;
+ }
+
+ let endi_32: i32 = 45;
+ let starti_32: i32 = 44;
+
+ let mut i_32: i32 = endi_32 - starti_32;
+
+ // Lint
+ if i_32 > i32::MIN {
+ i_32 -= 1;
+ }
+
+ // Lint
+ if i_32 > i32::MIN {
+ i_32 -= 1;
+ }
+
+ // Lint
+ if i_32 != i32::MIN {
+ i_32 -= 1;
+ }
+
+ // Lint
+ if i_32 != i32::MIN {
+ i_32 -= 1;
+ }
+
+ let endi_64: i64 = 45;
+ let starti_64: i64 = 44;
+
+ let mut i_64: i64 = endi_64 - starti_64;
+
+ // Lint
+ if i64::MIN < i_64 {
+ i_64 -= 1;
+ }
+
+ // Lint
+ if i64::MIN != i_64 {
+ i_64 -= 1;
+ }
+
+ // Lint
+ if i64::MIN < i_64 {
+ i_64 -= 1;
+ }
+
+ // No Lint
+ if i_64 > 0 {
+ i_64 -= 1;
+ }
+
+ // No Lint
+ if i_64 != 0 {
+ i_64 -= 1;
+ }
+
+ // issue #7831
+ // No Lint
+ if u_32 > 0 {
+ u_32 -= 1;
+ } else {
+ println!("side effect");
+ }
++
++ // Extended tests
++ let mut m = Mock;
++ let mut u_32 = 3000;
++ let a = 200;
++ let mut _b = 8;
++
++ if m != 0 {
++ m -= 1;
++ }
++
++ if a > 0 {
++ _b -= 1;
++ }
++
++ if 0 > a {
++ _b -= 1;
++ }
++
++ if u_32 > 0 {
++ u_32 -= 1;
++ } else {
++ println!("don't lint this");
++ }
++
++ if u_32 > 0 {
++ println!("don't lint this");
++ u_32 -= 1;
++ }
++
++ if u_32 > 42 {
++ println!("brace yourself!");
++ } else if u_32 > 0 {
++ u_32 -= 1;
++ }
+}
--- /dev/null
- --> $DIR/implicit_saturating_sub.rs:13:5
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:20:13
++ --> $DIR/implicit_saturating_sub.rs:28:5
+ |
+LL | / if u_8 > 0 {
+LL | | u_8 = u_8 - 1;
+LL | | }
+ | |_____^ help: try: `u_8 = u_8.saturating_sub(1);`
+ |
+ = note: `-D clippy::implicit-saturating-sub` implied by `-D warnings`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:34:5
++ --> $DIR/implicit_saturating_sub.rs:35:13
+ |
+LL | / if u_8 > 0 {
+LL | | u_8 -= 1;
+LL | | }
+ | |_____________^ help: try: `u_8 = u_8.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:44:5
++ --> $DIR/implicit_saturating_sub.rs:49:5
+ |
+LL | / if u_16 > 0 {
+LL | | u_16 -= 1;
+LL | | }
+ | |_____^ help: try: `u_16 = u_16.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:65:5
++ --> $DIR/implicit_saturating_sub.rs:59:5
+ |
+LL | / if u_32 != 0 {
+LL | | u_32 -= 1;
+LL | | }
+ | |_____^ help: try: `u_32 = u_32.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:70:5
++ --> $DIR/implicit_saturating_sub.rs:80:5
+ |
+LL | / if u_64 > 0 {
+LL | | u_64 -= 1;
+LL | | }
+ | |_____^ help: try: `u_64 = u_64.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:75:5
++ --> $DIR/implicit_saturating_sub.rs:85:5
+ |
+LL | / if 0 < u_64 {
+LL | | u_64 -= 1;
+LL | | }
+ | |_____^ help: try: `u_64 = u_64.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:96:5
++ --> $DIR/implicit_saturating_sub.rs:90:5
+ |
+LL | / if 0 != u_64 {
+LL | | u_64 -= 1;
+LL | | }
+ | |_____^ help: try: `u_64 = u_64.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:108:5
++ --> $DIR/implicit_saturating_sub.rs:111:5
+ |
+LL | / if u_usize > 0 {
+LL | | u_usize -= 1;
+LL | | }
+ | |_____^ help: try: `u_usize = u_usize.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:113:5
++ --> $DIR/implicit_saturating_sub.rs:123:5
+ |
+LL | / if i_8 > i8::MIN {
+LL | | i_8 -= 1;
+LL | | }
+ | |_____^ help: try: `i_8 = i_8.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:118:5
++ --> $DIR/implicit_saturating_sub.rs:128:5
+ |
+LL | / if i_8 > i8::MIN {
+LL | | i_8 -= 1;
+LL | | }
+ | |_____^ help: try: `i_8 = i_8.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:123:5
++ --> $DIR/implicit_saturating_sub.rs:133:5
+ |
+LL | / if i_8 != i8::MIN {
+LL | | i_8 -= 1;
+LL | | }
+ | |_____^ help: try: `i_8 = i_8.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:133:5
++ --> $DIR/implicit_saturating_sub.rs:138:5
+ |
+LL | / if i_8 != i8::MIN {
+LL | | i_8 -= 1;
+LL | | }
+ | |_____^ help: try: `i_8 = i_8.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:138:5
++ --> $DIR/implicit_saturating_sub.rs:148:5
+ |
+LL | / if i_16 > i16::MIN {
+LL | | i_16 -= 1;
+LL | | }
+ | |_____^ help: try: `i_16 = i_16.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:143:5
++ --> $DIR/implicit_saturating_sub.rs:153:5
+ |
+LL | / if i_16 > i16::MIN {
+LL | | i_16 -= 1;
+LL | | }
+ | |_____^ help: try: `i_16 = i_16.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:148:5
++ --> $DIR/implicit_saturating_sub.rs:158:5
+ |
+LL | / if i_16 != i16::MIN {
+LL | | i_16 -= 1;
+LL | | }
+ | |_____^ help: try: `i_16 = i_16.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:158:5
++ --> $DIR/implicit_saturating_sub.rs:163:5
+ |
+LL | / if i_16 != i16::MIN {
+LL | | i_16 -= 1;
+LL | | }
+ | |_____^ help: try: `i_16 = i_16.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:163:5
++ --> $DIR/implicit_saturating_sub.rs:173:5
+ |
+LL | / if i_32 > i32::MIN {
+LL | | i_32 -= 1;
+LL | | }
+ | |_____^ help: try: `i_32 = i_32.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:168:5
++ --> $DIR/implicit_saturating_sub.rs:178:5
+ |
+LL | / if i_32 > i32::MIN {
+LL | | i_32 -= 1;
+LL | | }
+ | |_____^ help: try: `i_32 = i_32.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:173:5
++ --> $DIR/implicit_saturating_sub.rs:183:5
+ |
+LL | / if i_32 != i32::MIN {
+LL | | i_32 -= 1;
+LL | | }
+ | |_____^ help: try: `i_32 = i_32.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:183:5
++ --> $DIR/implicit_saturating_sub.rs:188:5
+ |
+LL | / if i_32 != i32::MIN {
+LL | | i_32 -= 1;
+LL | | }
+ | |_____^ help: try: `i_32 = i_32.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:188:5
++ --> $DIR/implicit_saturating_sub.rs:198:5
+ |
+LL | / if i64::MIN < i_64 {
+LL | | i_64 -= 1;
+LL | | }
+ | |_____^ help: try: `i_64 = i_64.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
- --> $DIR/implicit_saturating_sub.rs:193:5
++ --> $DIR/implicit_saturating_sub.rs:203:5
+ |
+LL | / if i64::MIN != i_64 {
+LL | | i_64 -= 1;
+LL | | }
+ | |_____^ help: try: `i_64 = i_64.saturating_sub(1);`
+
+error: implicitly performing saturating subtraction
++ --> $DIR/implicit_saturating_sub.rs:208:5
+ |
+LL | / if i64::MIN < i_64 {
+LL | | i_64 -= 1;
+LL | | }
+ | |_____^ help: try: `i_64 = i_64.saturating_sub(1);`
+
+error: aborting due to 23 previous errors
+
--- /dev/null
+// does not test any rustfixable lints
+
+#![warn(clippy::mixed_case_hex_literals)]
+#![warn(clippy::zero_prefixed_literal)]
+#![warn(clippy::unseparated_literal_suffix)]
+#![warn(clippy::separated_literal_suffix)]
+#![allow(dead_code, overflowing_literals)]
+
+fn main() {
+ let ok1 = 0xABCD;
+ let ok3 = 0xab_cd;
+ let ok4 = 0xab_cd_i32;
+ let ok5 = 0xAB_CD_u32;
+ let ok5 = 0xAB_CD_isize;
+ let fail1 = 0xabCD;
+ let fail2 = 0xabCD_u32;
+ let fail2 = 0xabCD_isize;
+ let fail_multi_zero = 000_123usize;
+
+ let ok9 = 0;
+ let ok10 = 0_i64;
+ let fail8 = 0123;
+
+ let ok11 = 0o123;
+ let ok12 = 0b10_1010;
+
+ let ok13 = 0xab_abcd;
+ let ok14 = 0xBAFE_BAFE;
+ let ok15 = 0xab_cabc_abca_bcab_cabc;
+ let ok16 = 0xFE_BAFE_ABAB_ABCD;
+ let ok17 = 0x123_4567_8901_usize;
+ let ok18 = 0xF;
+
+ let fail19 = 12_3456_21;
+ let fail22 = 3__4___23;
+ let fail23 = 3__16___23;
+
+ let fail24 = 0xAB_ABC_AB;
+ let fail25 = 0b01_100_101;
+ let ok26 = 0x6_A0_BF;
+ let ok27 = 0b1_0010_0101;
+}
++
++fn issue9651() {
++ // lint but octal form is not possible here
++ let _ = 08;
++ let _ = 09;
++ let _ = 089;
++}
--- /dev/null
- error: aborting due to 18 previous errors
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:12:15
+ |
+LL | let ok4 = 0xab_cd_i32;
+ | ^^^^^^^^^^^ help: remove the underscore: `0xab_cdi32`
+ |
+ = note: `-D clippy::separated-literal-suffix` implied by `-D warnings`
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:13:15
+ |
+LL | let ok5 = 0xAB_CD_u32;
+ | ^^^^^^^^^^^ help: remove the underscore: `0xAB_CDu32`
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:14:15
+ |
+LL | let ok5 = 0xAB_CD_isize;
+ | ^^^^^^^^^^^^^ help: remove the underscore: `0xAB_CDisize`
+
+error: inconsistent casing in hexadecimal literal
+ --> $DIR/literals.rs:15:17
+ |
+LL | let fail1 = 0xabCD;
+ | ^^^^^^
+ |
+ = note: `-D clippy::mixed-case-hex-literals` implied by `-D warnings`
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:16:17
+ |
+LL | let fail2 = 0xabCD_u32;
+ | ^^^^^^^^^^ help: remove the underscore: `0xabCDu32`
+
+error: inconsistent casing in hexadecimal literal
+ --> $DIR/literals.rs:16:17
+ |
+LL | let fail2 = 0xabCD_u32;
+ | ^^^^^^^^^^
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:17:17
+ |
+LL | let fail2 = 0xabCD_isize;
+ | ^^^^^^^^^^^^ help: remove the underscore: `0xabCDisize`
+
+error: inconsistent casing in hexadecimal literal
+ --> $DIR/literals.rs:17:17
+ |
+LL | let fail2 = 0xabCD_isize;
+ | ^^^^^^^^^^^^
+
+error: integer type suffix should be separated by an underscore
+ --> $DIR/literals.rs:18:27
+ |
+LL | let fail_multi_zero = 000_123usize;
+ | ^^^^^^^^^^^^ help: add an underscore: `000_123_usize`
+ |
+ = note: `-D clippy::unseparated-literal-suffix` implied by `-D warnings`
+
+error: this is a decimal constant
+ --> $DIR/literals.rs:18:27
+ |
+LL | let fail_multi_zero = 000_123usize;
+ | ^^^^^^^^^^^^
+ |
+ = note: `-D clippy::zero-prefixed-literal` implied by `-D warnings`
+help: if you mean to use a decimal constant, remove the `0` to avoid confusion
+ |
+LL | let fail_multi_zero = 123usize;
+ | ~~~~~~~~
+help: if you mean to use an octal constant, use `0o`
+ |
+LL | let fail_multi_zero = 0o123usize;
+ | ~~~~~~~~~~
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:21:16
+ |
+LL | let ok10 = 0_i64;
+ | ^^^^^ help: remove the underscore: `0i64`
+
+error: this is a decimal constant
+ --> $DIR/literals.rs:22:17
+ |
+LL | let fail8 = 0123;
+ | ^^^^
+ |
+help: if you mean to use a decimal constant, remove the `0` to avoid confusion
+ |
+LL | let fail8 = 123;
+ | ~~~
+help: if you mean to use an octal constant, use `0o`
+ |
+LL | let fail8 = 0o123;
+ | ~~~~~
+
+error: integer type suffix should not be separated by an underscore
+ --> $DIR/literals.rs:31:16
+ |
+LL | let ok17 = 0x123_4567_8901_usize;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: remove the underscore: `0x123_4567_8901usize`
+
+error: digits grouped inconsistently by underscores
+ --> $DIR/literals.rs:34:18
+ |
+LL | let fail19 = 12_3456_21;
+ | ^^^^^^^^^^ help: consider: `12_345_621`
+ |
+ = note: `-D clippy::inconsistent-digit-grouping` implied by `-D warnings`
+
+error: digits grouped inconsistently by underscores
+ --> $DIR/literals.rs:35:18
+ |
+LL | let fail22 = 3__4___23;
+ | ^^^^^^^^^ help: consider: `3_423`
+
+error: digits grouped inconsistently by underscores
+ --> $DIR/literals.rs:36:18
+ |
+LL | let fail23 = 3__16___23;
+ | ^^^^^^^^^^ help: consider: `31_623`
+
+error: digits of hex or binary literal not grouped by four
+ --> $DIR/literals.rs:38:18
+ |
+LL | let fail24 = 0xAB_ABC_AB;
+ | ^^^^^^^^^^^ help: consider: `0x0ABA_BCAB`
+ |
+ = note: `-D clippy::unusual-byte-groupings` implied by `-D warnings`
+
+error: digits of hex or binary literal not grouped by four
+ --> $DIR/literals.rs:39:18
+ |
+LL | let fail25 = 0b01_100_101;
+ | ^^^^^^^^^^^^ help: consider: `0b0110_0101`
+
++error: this is a decimal constant
++ --> $DIR/literals.rs:46:13
++ |
++LL | let _ = 08;
++ | ^^
++ |
++help: if you mean to use a decimal constant, remove the `0` to avoid confusion
++ |
++LL | let _ = 8;
++ | ~
++
++error: this is a decimal constant
++ --> $DIR/literals.rs:47:13
++ |
++LL | let _ = 09;
++ | ^^
++ |
++help: if you mean to use a decimal constant, remove the `0` to avoid confusion
++ |
++LL | let _ = 9;
++ | ~
++
++error: this is a decimal constant
++ --> $DIR/literals.rs:48:13
++ |
++LL | let _ = 089;
++ | ^^^
++ |
++help: if you mean to use a decimal constant, remove the `0` to avoid confusion
++ |
++LL | let _ = 89;
++ | ~~
++
++error: aborting due to 21 previous errors
+
--- /dev/null
- // [edition2018] edition:2018
- // [edition2021] edition:2021
+// revisions: edition2018 edition2021
- assert!(a.is_empty(), "qwqwq");
++//[edition2018] edition:2018
++//[edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(dead_code, unused_doc_comments)]
+#![allow(clippy::nonminimal_bool, clippy::uninlined_format_args)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
+ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ assert!(a.is_empty(), "qaqaq{:?}", a);
- assert!(!b.is_empty(), "panic1");
- assert!(!(b.is_empty() && a.is_empty()), "panic2");
- assert!(!(a.is_empty() && !b.is_empty()), "panic3");
- assert!(!(b.is_empty() || a.is_empty()), "panic4");
- assert!(!(a.is_empty() || !b.is_empty()), "panic5");
++ if !a.is_empty() {
++ panic!("qwqwq");
++ }
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
- // comment
- /* this is a
++ if b.is_empty() {
++ panic!("panic1");
++ }
++ if b.is_empty() && a.is_empty() {
++ panic!("panic2");
++ }
++ if a.is_empty() && !b.is_empty() {
++ panic!("panic3");
++ }
++ if b.is_empty() || a.is_empty() {
++ panic!("panic4");
++ }
++ if a.is_empty() || !b.is_empty() {
++ panic!("panic5");
++ }
+ assert!(!a.is_empty(), "with expansion {}", one!());
+}
+
+fn issue7730(a: u8) {
+ // Suggestion should preserve comment
- /// Doc comment
- // comment after `panic!`
- assert!(!(a > 2), "panic with comment");
++ if a > 2 {
++ // comment
++ /* this is a
+ multiline
+ comment */
++ /// Doc comment
++ panic!("panic with comment") // comment after `panic!`
++ }
+}
--- /dev/null
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:34:5
- |
- LL | / if !a.is_empty() {
- LL | | panic!("qwqwq");
- LL | | }
- | |_____^ help: try instead: `assert!(a.is_empty(), "qwqwq");`
-
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:51:5
- |
- LL | / if b.is_empty() {
- LL | | panic!("panic1");
- LL | | }
- | |_____^ help: try instead: `assert!(!b.is_empty(), "panic1");`
-
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:54:5
- |
- LL | / if b.is_empty() && a.is_empty() {
- LL | | panic!("panic2");
- LL | | }
- | |_____^ help: try instead: `assert!(!(b.is_empty() && a.is_empty()), "panic2");`
-
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:57:5
- |
- LL | / if a.is_empty() && !b.is_empty() {
- LL | | panic!("panic3");
- LL | | }
- | |_____^ help: try instead: `assert!(!(a.is_empty() && !b.is_empty()), "panic3");`
-
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:60:5
- |
- LL | / if b.is_empty() || a.is_empty() {
- LL | | panic!("panic4");
- LL | | }
- | |_____^ help: try instead: `assert!(!(b.is_empty() || a.is_empty()), "panic4");`
-
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:63:5
- |
- LL | / if a.is_empty() || !b.is_empty() {
- LL | | panic!("panic5");
- LL | | }
- | |_____^ help: try instead: `assert!(!(a.is_empty() || !b.is_empty()), "panic5");`
-
+error: only a `panic!` in `if`-then statement
+ --> $DIR/manual_assert.rs:31:5
+ |
+LL | / if !a.is_empty() {
+LL | | panic!("qaqaq{:?}", a);
+LL | | }
+ | |_____^ help: try instead: `assert!(a.is_empty(), "qaqaq{:?}", a);`
+ |
+ = note: `-D clippy::manual-assert` implied by `-D warnings`
+
- error: only a `panic!` in `if`-then statement
- --> $DIR/manual_assert.rs:73:5
- |
- LL | / if a > 2 {
- LL | | // comment
- LL | | /* this is a
- LL | | multiline
- ... |
- LL | | panic!("panic with comment") // comment after `panic!`
- LL | | }
- | |_____^
- |
- help: try instead
- |
- LL | assert!(!(a > 2), "panic with comment");
- |
-
- error: aborting due to 9 previous errors
+error: only a `panic!` in `if`-then statement
+ --> $DIR/manual_assert.rs:66:5
+ |
+LL | / if a.is_empty() {
+LL | | panic!("with expansion {}", one!())
+LL | | }
+ | |_____^ help: try instead: `assert!(!a.is_empty(), "with expansion {}", one!());`
+
++error: aborting due to 2 previous errors
+
--- /dev/null
- // [edition2018] edition:2018
- // [edition2021] edition:2021
+// revisions: edition2018 edition2021
++//[edition2018] edition:2018
++//[edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(dead_code, unused_doc_comments)]
+#![allow(clippy::nonminimal_bool, clippy::uninlined_format_args)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
+ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ assert!(a.is_empty(), "qaqaq{:?}", a);
+ assert!(a.is_empty(), "qwqwq");
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ assert!(!b.is_empty(), "panic1");
+ assert!(!(b.is_empty() && a.is_empty()), "panic2");
+ assert!(!(a.is_empty() && !b.is_empty()), "panic3");
+ assert!(!(b.is_empty() || a.is_empty()), "panic4");
+ assert!(!(a.is_empty() || !b.is_empty()), "panic5");
+ assert!(!a.is_empty(), "with expansion {}", one!());
+}
+
+fn issue7730(a: u8) {
+ // Suggestion should preserve comment
+ // comment
+/* this is a
+ multiline
+ comment */
+/// Doc comment
+// comment after `panic!`
+assert!(!(a > 2), "panic with comment");
+}
--- /dev/null
- // [edition2018] edition:2018
- // [edition2021] edition:2021
+// revisions: edition2018 edition2021
++//[edition2018] edition:2018
++//[edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(dead_code, unused_doc_comments)]
+#![allow(clippy::nonminimal_bool, clippy::uninlined_format_args)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
+ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ if !a.is_empty() {
+ panic!("qaqaq{:?}", a);
+ }
+ if !a.is_empty() {
+ panic!("qwqwq");
+ }
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ if b.is_empty() {
+ panic!("panic1");
+ }
+ if b.is_empty() && a.is_empty() {
+ panic!("panic2");
+ }
+ if a.is_empty() && !b.is_empty() {
+ panic!("panic3");
+ }
+ if b.is_empty() || a.is_empty() {
+ panic!("panic4");
+ }
+ if a.is_empty() || !b.is_empty() {
+ panic!("panic5");
+ }
+ if a.is_empty() {
+ panic!("with expansion {}", one!())
+ }
+}
+
+fn issue7730(a: u8) {
+ // Suggestion should preserve comment
+ if a > 2 {
+ // comment
+ /* this is a
+ multiline
+ comment */
+ /// Doc comment
+ panic!("panic with comment") // comment after `panic!`
+ }
+}
--- /dev/null
++#![feature(custom_inner_attributes)]
+#![warn(clippy::manual_clamp)]
+#![allow(
+ unused,
+ dead_code,
+ clippy::unnecessary_operation,
+ clippy::no_effect,
+ clippy::if_same_then_else
+)]
+
+use std::cmp::{max as cmp_max, min as cmp_min};
+
+const CONST_MAX: i32 = 10;
+const CONST_MIN: i32 = 4;
+
+const CONST_F64_MAX: f64 = 10.0;
+const CONST_F64_MIN: f64 = 4.0;
+
+fn main() {
+ let (input, min, max) = (0, -2, 3);
+ // Lint
+ let x0 = if max < input {
+ max
+ } else if min > input {
+ min
+ } else {
+ input
+ };
+
+ let x1 = if input > max {
+ max
+ } else if input < min {
+ min
+ } else {
+ input
+ };
+
+ let x2 = if input < min {
+ min
+ } else if input > max {
+ max
+ } else {
+ input
+ };
+
+ let x3 = if min > input {
+ min
+ } else if max < input {
+ max
+ } else {
+ input
+ };
+
+ let x4 = input.max(min).min(max);
+
+ let x5 = input.min(max).max(min);
+
+ let x6 = match input {
+ x if x > max => max,
+ x if x < min => min,
+ x => x,
+ };
+
+ let x7 = match input {
+ x if x < min => min,
+ x if x > max => max,
+ x => x,
+ };
+
+ let x8 = match input {
+ x if max < x => max,
+ x if min > x => min,
+ x => x,
+ };
+
+ let mut x9 = input;
+ if x9 < min {
+ x9 = min;
+ }
+ if x9 > max {
+ x9 = max;
+ }
+
+ let x10 = match input {
+ x if min > x => min,
+ x if max < x => max,
+ x => x,
+ };
+
+ let mut x11 = input;
+ let _ = 1;
+ if x11 > max {
+ x11 = max;
+ }
+ if x11 < min {
+ x11 = min;
+ }
+
+ let mut x12 = input;
+ if min > x12 {
+ x12 = min;
+ }
+ if max < x12 {
+ x12 = max;
+ }
+
+ let mut x13 = input;
+ if max < x13 {
+ x13 = max;
+ }
+ if min > x13 {
+ x13 = min;
+ }
+
+ let x14 = if input > CONST_MAX {
+ CONST_MAX
+ } else if input < CONST_MIN {
+ CONST_MIN
+ } else {
+ input
+ };
+ {
+ let (input, min, max) = (0.0f64, -2.0, 3.0);
+ let x15 = if input > max {
+ max
+ } else if input < min {
+ min
+ } else {
+ input
+ };
+ }
+ {
+ let input: i32 = cmp_min_max(1);
+ // These can only be detected if exactly one of the arguments to the inner function is const.
+ let x16 = cmp_max(cmp_min(input, CONST_MAX), CONST_MIN);
+ let x17 = cmp_min(cmp_max(input, CONST_MIN), CONST_MAX);
+ let x18 = cmp_max(CONST_MIN, cmp_min(input, CONST_MAX));
+ let x19 = cmp_min(CONST_MAX, cmp_max(input, CONST_MIN));
+ let x20 = cmp_max(cmp_min(CONST_MAX, input), CONST_MIN);
+ let x21 = cmp_min(cmp_max(CONST_MIN, input), CONST_MAX);
+ let x22 = cmp_max(CONST_MIN, cmp_min(CONST_MAX, input));
+ let x23 = cmp_min(CONST_MAX, cmp_max(CONST_MIN, input));
+ let input: f64 = cmp_min_max(1) as f64;
+ let x24 = f64::max(f64::min(input, CONST_F64_MAX), CONST_F64_MIN);
+ let x25 = f64::min(f64::max(input, CONST_F64_MIN), CONST_F64_MAX);
+ let x26 = f64::max(CONST_F64_MIN, f64::min(input, CONST_F64_MAX));
+ let x27 = f64::min(CONST_F64_MAX, f64::max(input, CONST_F64_MIN));
+ let x28 = f64::max(f64::min(CONST_F64_MAX, input), CONST_F64_MIN);
+ let x29 = f64::min(f64::max(CONST_F64_MIN, input), CONST_F64_MAX);
+ let x30 = f64::max(CONST_F64_MIN, f64::min(CONST_F64_MAX, input));
+ let x31 = f64::min(CONST_F64_MAX, f64::max(CONST_F64_MIN, input));
+ }
+ let mut x32 = input;
+ if x32 < min {
+ x32 = min;
+ } else if x32 > max {
+ x32 = max;
+ }
+
+ // It's important this be the last set of statements
+ let mut x33 = input;
+ if max < x33 {
+ x33 = max;
+ }
+ if min > x33 {
+ x33 = min;
+ }
+}
+
+// This code intentionally nonsense.
+fn no_lint() {
+ let (input, min, max) = (0, -2, 3);
+ let x0 = if max < input {
+ max
+ } else if min > input {
+ max
+ } else {
+ min
+ };
+
+ let x1 = if input > max {
+ max
+ } else if input > min {
+ min
+ } else {
+ max
+ };
+
+ let x2 = if max < min {
+ min
+ } else if input > max {
+ input
+ } else {
+ input
+ };
+
+ let x3 = if min > input {
+ input
+ } else if max < input {
+ max
+ } else {
+ max
+ };
+
+ let x6 = match input {
+ x if x < max => x,
+ x if x < min => x,
+ x => x,
+ };
+
+ let x7 = match input {
+ x if x < min => max,
+ x if x > max => min,
+ x => x,
+ };
+
+ let x8 = match input {
+ x if max > x => max,
+ x if min > x => min,
+ x => x,
+ };
+
+ let mut x9 = input;
+ if x9 > min {
+ x9 = min;
+ }
+ if x9 > max {
+ x9 = max;
+ }
+
+ let x10 = match input {
+ x if min > x => min,
+ x if max < x => max,
+ x => min,
+ };
+
+ let mut x11 = input;
+ if x11 > max {
+ x11 = min;
+ }
+ if x11 < min {
+ x11 = max;
+ }
+
+ let mut x12 = input;
+ if min > x12 {
+ x12 = max * 3;
+ }
+ if max < x12 {
+ x12 = min;
+ }
+
+ let mut x13 = input;
+ if max < x13 {
+ let x13 = max;
+ }
+ if min > x13 {
+ x13 = min;
+ }
+ let mut x14 = input;
+ if x14 < min {
+ x14 = 3;
+ } else if x14 > max {
+ x14 = max;
+ }
+ {
+ let input: i32 = cmp_min_max(1);
+ // These can only be detected if exactly one of the arguments to the inner function is const.
+ let x16 = cmp_max(cmp_max(input, CONST_MAX), CONST_MIN);
+ let x17 = cmp_min(cmp_min(input, CONST_MIN), CONST_MAX);
+ let x18 = cmp_max(CONST_MIN, cmp_max(input, CONST_MAX));
+ let x19 = cmp_min(CONST_MAX, cmp_min(input, CONST_MIN));
+ let x20 = cmp_max(cmp_max(CONST_MAX, input), CONST_MIN);
+ let x21 = cmp_min(cmp_min(CONST_MIN, input), CONST_MAX);
+ let x22 = cmp_max(CONST_MIN, cmp_max(CONST_MAX, input));
+ let x23 = cmp_min(CONST_MAX, cmp_min(CONST_MIN, input));
+ let input: f64 = cmp_min_max(1) as f64;
+ let x24 = f64::max(f64::max(input, CONST_F64_MAX), CONST_F64_MIN);
+ let x25 = f64::min(f64::min(input, CONST_F64_MIN), CONST_F64_MAX);
+ let x26 = f64::max(CONST_F64_MIN, f64::max(input, CONST_F64_MAX));
+ let x27 = f64::min(CONST_F64_MAX, f64::min(input, CONST_F64_MIN));
+ let x28 = f64::max(f64::max(CONST_F64_MAX, input), CONST_F64_MIN);
+ let x29 = f64::min(f64::min(CONST_F64_MIN, input), CONST_F64_MAX);
+ let x30 = f64::max(CONST_F64_MIN, f64::max(CONST_F64_MAX, input));
+ let x31 = f64::min(CONST_F64_MAX, f64::min(CONST_F64_MIN, input));
+ let x32 = f64::min(CONST_F64_MAX, f64::min(CONST_F64_MIN, CONST_F64_MAX));
+ }
+}
+
+fn dont_tell_me_what_to_do() {
+ let (input, min, max) = (0, -2, 3);
+ let mut x_never = input;
+ #[allow(clippy::manual_clamp)]
+ if x_never < min {
+ x_never = min;
+ }
+ if x_never > max {
+ x_never = max;
+ }
+}
+
+/// Just to ensure this isn't const evaled
+fn cmp_min_max(input: i32) -> i32 {
+ input * 3
+}
++
++fn msrv_1_49() {
++ #![clippy::msrv = "1.49"]
++
++ let (input, min, max) = (0, -1, 2);
++ let _ = if input < min {
++ min
++ } else if input > max {
++ max
++ } else {
++ input
++ };
++}
++
++fn msrv_1_50() {
++ #![clippy::msrv = "1.50"]
++
++ let (input, min, max) = (0, -1, 2);
++ let _ = if input < min {
++ min
++ } else if input > max {
++ max
++ } else {
++ input
++ };
++}
--- /dev/null
- --> $DIR/manual_clamp.rs:76:5
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:91:5
++ --> $DIR/manual_clamp.rs:77:5
+ |
+LL | / if x9 < min {
+LL | | x9 = min;
+LL | | }
+LL | | if x9 > max {
+LL | | x9 = max;
+LL | | }
+ | |_____^ help: replace with clamp: `x9 = x9.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+ = note: `-D clippy::manual-clamp` implied by `-D warnings`
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:99:5
++ --> $DIR/manual_clamp.rs:92:5
+ |
+LL | / if x11 > max {
+LL | | x11 = max;
+LL | | }
+LL | | if x11 < min {
+LL | | x11 = min;
+LL | | }
+ | |_____^ help: replace with clamp: `x11 = x11.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:107:5
++ --> $DIR/manual_clamp.rs:100:5
+ |
+LL | / if min > x12 {
+LL | | x12 = min;
+LL | | }
+LL | | if max < x12 {
+LL | | x12 = max;
+LL | | }
+ | |_____^ help: replace with clamp: `x12 = x12.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:161:5
++ --> $DIR/manual_clamp.rs:108:5
+ |
+LL | / if max < x13 {
+LL | | x13 = max;
+LL | | }
+LL | | if min > x13 {
+LL | | x13 = min;
+LL | | }
+ | |_____^ help: replace with clamp: `x13 = x13.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:21:14
++ --> $DIR/manual_clamp.rs:162:5
+ |
+LL | / if max < x33 {
+LL | | x33 = max;
+LL | | }
+LL | | if min > x33 {
+LL | | x33 = min;
+LL | | }
+ | |_____^ help: replace with clamp: `x33 = x33.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:29:14
++ --> $DIR/manual_clamp.rs:22:14
+ |
+LL | let x0 = if max < input {
+ | ______________^
+LL | | max
+LL | | } else if min > input {
+LL | | min
+LL | | } else {
+LL | | input
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:37:14
++ --> $DIR/manual_clamp.rs:30:14
+ |
+LL | let x1 = if input > max {
+ | ______________^
+LL | | max
+LL | | } else if input < min {
+LL | | min
+LL | | } else {
+LL | | input
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:45:14
++ --> $DIR/manual_clamp.rs:38:14
+ |
+LL | let x2 = if input < min {
+ | ______________^
+LL | | min
+LL | | } else if input > max {
+LL | | max
+LL | | } else {
+LL | | input
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:53:14
++ --> $DIR/manual_clamp.rs:46:14
+ |
+LL | let x3 = if min > input {
+ | ______________^
+LL | | min
+LL | | } else if max < input {
+LL | | max
+LL | | } else {
+LL | | input
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:55:14
++ --> $DIR/manual_clamp.rs:54:14
+ |
+LL | let x4 = input.max(min).min(max);
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:57:14
++ --> $DIR/manual_clamp.rs:56:14
+ |
+LL | let x5 = input.min(max).max(min);
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:63:14
++ --> $DIR/manual_clamp.rs:58:14
+ |
+LL | let x6 = match input {
+ | ______________^
+LL | | x if x > max => max,
+LL | | x if x < min => min,
+LL | | x => x,
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:69:14
++ --> $DIR/manual_clamp.rs:64:14
+ |
+LL | let x7 = match input {
+ | ______________^
+LL | | x if x < min => min,
+LL | | x if x > max => max,
+LL | | x => x,
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:83:15
++ --> $DIR/manual_clamp.rs:70:14
+ |
+LL | let x8 = match input {
+ | ______________^
+LL | | x if max < x => max,
+LL | | x if min > x => min,
+LL | | x => x,
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:114:15
++ --> $DIR/manual_clamp.rs:84:15
+ |
+LL | let x10 = match input {
+ | _______________^
+LL | | x if min > x => min,
+LL | | x if max < x => max,
+LL | | x => x,
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:123:19
++ --> $DIR/manual_clamp.rs:115:15
+ |
+LL | let x14 = if input > CONST_MAX {
+ | _______________^
+LL | | CONST_MAX
+LL | | } else if input < CONST_MIN {
+LL | | CONST_MIN
+LL | | } else {
+LL | | input
+LL | | };
+ | |_____^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:134:19
++ --> $DIR/manual_clamp.rs:124:19
+ |
+LL | let x15 = if input > max {
+ | ___________________^
+LL | | max
+LL | | } else if input < min {
+LL | | min
+LL | | } else {
+LL | | input
+LL | | };
+ | |_________^ help: replace with clamp: `input.clamp(min, max)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:135:19
++ --> $DIR/manual_clamp.rs:135:19
+ |
+LL | let x16 = cmp_max(cmp_min(input, CONST_MAX), CONST_MIN);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:136:19
++ --> $DIR/manual_clamp.rs:136:19
+ |
+LL | let x17 = cmp_min(cmp_max(input, CONST_MIN), CONST_MAX);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:137:19
++ --> $DIR/manual_clamp.rs:137:19
+ |
+LL | let x18 = cmp_max(CONST_MIN, cmp_min(input, CONST_MAX));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:138:19
++ --> $DIR/manual_clamp.rs:138:19
+ |
+LL | let x19 = cmp_min(CONST_MAX, cmp_max(input, CONST_MIN));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:139:19
++ --> $DIR/manual_clamp.rs:139:19
+ |
+LL | let x20 = cmp_max(cmp_min(CONST_MAX, input), CONST_MIN);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:140:19
++ --> $DIR/manual_clamp.rs:140:19
+ |
+LL | let x21 = cmp_min(cmp_max(CONST_MIN, input), CONST_MAX);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:141:19
++ --> $DIR/manual_clamp.rs:141:19
+ |
+LL | let x22 = cmp_max(CONST_MIN, cmp_min(CONST_MAX, input));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:143:19
++ --> $DIR/manual_clamp.rs:142:19
+ |
+LL | let x23 = cmp_min(CONST_MAX, cmp_max(CONST_MIN, input));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_MIN, CONST_MAX)`
+ |
+ = note: clamp will panic if max < min
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:144:19
++ --> $DIR/manual_clamp.rs:144:19
+ |
+LL | let x24 = f64::max(f64::min(input, CONST_F64_MAX), CONST_F64_MIN);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:145:19
++ --> $DIR/manual_clamp.rs:145:19
+ |
+LL | let x25 = f64::min(f64::max(input, CONST_F64_MIN), CONST_F64_MAX);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:146:19
++ --> $DIR/manual_clamp.rs:146:19
+ |
+LL | let x26 = f64::max(CONST_F64_MIN, f64::min(input, CONST_F64_MAX));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:147:19
++ --> $DIR/manual_clamp.rs:147:19
+ |
+LL | let x27 = f64::min(CONST_F64_MAX, f64::max(input, CONST_F64_MIN));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:148:19
++ --> $DIR/manual_clamp.rs:148:19
+ |
+LL | let x28 = f64::max(f64::min(CONST_F64_MAX, input), CONST_F64_MIN);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:149:19
++ --> $DIR/manual_clamp.rs:149:19
+ |
+LL | let x29 = f64::min(f64::max(CONST_F64_MIN, input), CONST_F64_MAX);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:150:19
++ --> $DIR/manual_clamp.rs:150:19
+ |
+LL | let x30 = f64::max(CONST_F64_MIN, f64::min(CONST_F64_MAX, input));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- --> $DIR/manual_clamp.rs:153:5
++ --> $DIR/manual_clamp.rs:151:19
+ |
+LL | let x31 = f64::min(CONST_F64_MAX, f64::max(CONST_F64_MIN, input));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with clamp: `input.clamp(CONST_F64_MIN, CONST_F64_MAX)`
+ |
+ = note: clamp will panic if max < min, min.is_nan(), or max.is_nan()
+ = note: clamp returns NaN if the input is NaN
+
+error: clamp-like pattern without using clamp function
- error: aborting due to 34 previous errors
++ --> $DIR/manual_clamp.rs:154:5
+ |
+LL | / if x32 < min {
+LL | | x32 = min;
+LL | | } else if x32 > max {
+LL | | x32 = max;
+LL | | }
+ | |_____^ help: replace with clamp: `x32 = x32.clamp(min, max);`
+ |
+ = note: clamp will panic if max < min
+
++error: clamp-like pattern without using clamp function
++ --> $DIR/manual_clamp.rs:324:13
++ |
++LL | let _ = if input < min {
++ | _____________^
++LL | | min
++LL | | } else if input > max {
++LL | | max
++LL | | } else {
++LL | | input
++LL | | };
++ | |_____^ help: replace with clamp: `input.clamp(min, max)`
++ |
++ = note: clamp will panic if max < min
++
++error: aborting due to 35 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::manual_filter)]
++#![allow(unused_variables, dead_code)]
++
++fn main() {
++ Some(0).filter(|&x| x <= 0);
++
++ Some(1).filter(|&x| x <= 0);
++
++ Some(2).filter(|&x| x <= 0);
++
++ Some(3).filter(|&x| x > 0);
++
++ let y = Some(4);
++ y.filter(|&x| x <= 0);
++
++ Some(5).filter(|&x| x > 0);
++
++ Some(6).as_ref().filter(|&x| x > &0);
++
++ let external_cond = true;
++ Some(String::new()).filter(|x| external_cond);
++
++ Some(7).filter(|&x| external_cond);
++
++ Some(8).filter(|&x| x != 0);
++
++ Some(9).filter(|&x| x > 10 && x < 100);
++
++ const fn f1() {
++ // Don't lint, `.filter` is not const
++ match Some(10) {
++ Some(x) => {
++ if x > 10 && x < 100 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++ }
++
++ #[allow(clippy::blocks_in_if_conditions)]
++ Some(11).filter(|&x| {
++ println!("foo");
++ x > 10 && x < 100
++ });
++
++ match Some(12) {
++ // Don't Lint, statement is lost by `.filter`
++ Some(x) => {
++ if x > 10 && x < 100 {
++ println!("foo");
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ match Some(13) {
++ // Don't Lint, because of `None => Some(1)`
++ Some(x) => {
++ if x > 10 && x < 100 {
++ println!("foo");
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => Some(1),
++ };
++
++ unsafe fn f(x: u32) -> bool {
++ true
++ }
++ let _ = Some(14).filter(|&x| unsafe { f(x) });
++ let _ = Some(15).filter(|&x| unsafe { f(x) });
++
++ #[allow(clippy::redundant_pattern_matching)]
++ if let Some(_) = Some(16) {
++ Some(16)
++ } else { Some(16).filter(|&x| x % 2 == 0) };
++
++ match Some((17, 17)) {
++ // Not linted for now could be
++ Some((x, y)) => {
++ if y != x {
++ Some((x, y))
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ struct NamedTuple {
++ pub x: u8,
++ pub y: (i32, u32),
++ }
++
++ match Some(NamedTuple {
++ // Not linted for now could be
++ x: 17,
++ y: (18, 19),
++ }) {
++ Some(NamedTuple { x, y }) => {
++ if y.1 != x as u32 {
++ Some(NamedTuple { x, y })
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::manual_filter)]
++#![allow(unused_variables, dead_code)]
++
++fn main() {
++ match Some(0) {
++ None => None,
++ Some(x) => {
++ if x > 0 {
++ None
++ } else {
++ Some(x)
++ }
++ },
++ };
++
++ match Some(1) {
++ Some(x) => {
++ if x > 0 {
++ None
++ } else {
++ Some(x)
++ }
++ },
++ None => None,
++ };
++
++ match Some(2) {
++ Some(x) => {
++ if x > 0 {
++ None
++ } else {
++ Some(x)
++ }
++ },
++ _ => None,
++ };
++
++ match Some(3) {
++ Some(x) => {
++ if x > 0 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ let y = Some(4);
++ match y {
++ // Some(4)
++ None => None,
++ Some(x) => {
++ if x > 0 {
++ None
++ } else {
++ Some(x)
++ }
++ },
++ };
++
++ match Some(5) {
++ Some(x) => {
++ if x > 0 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ _ => None,
++ };
++
++ match Some(6) {
++ Some(ref x) => {
++ if x > &0 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ _ => None,
++ };
++
++ let external_cond = true;
++ match Some(String::new()) {
++ Some(x) => {
++ if external_cond {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ _ => None,
++ };
++
++ if let Some(x) = Some(7) {
++ if external_cond { Some(x) } else { None }
++ } else {
++ None
++ };
++
++ match &Some(8) {
++ &Some(x) => {
++ if x != 0 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ _ => None,
++ };
++
++ match Some(9) {
++ Some(x) => {
++ if x > 10 && x < 100 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ const fn f1() {
++ // Don't lint, `.filter` is not const
++ match Some(10) {
++ Some(x) => {
++ if x > 10 && x < 100 {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++ }
++
++ #[allow(clippy::blocks_in_if_conditions)]
++ match Some(11) {
++ // Lint, statement is preserved by `.filter`
++ Some(x) => {
++ if {
++ println!("foo");
++ x > 10 && x < 100
++ } {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ match Some(12) {
++ // Don't Lint, statement is lost by `.filter`
++ Some(x) => {
++ if x > 10 && x < 100 {
++ println!("foo");
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ match Some(13) {
++ // Don't Lint, because of `None => Some(1)`
++ Some(x) => {
++ if x > 10 && x < 100 {
++ println!("foo");
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => Some(1),
++ };
++
++ unsafe fn f(x: u32) -> bool {
++ true
++ }
++ let _ = match Some(14) {
++ Some(x) => {
++ if unsafe { f(x) } {
++ Some(x)
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++ let _ = match Some(15) {
++ Some(x) => unsafe {
++ if f(x) { Some(x) } else { None }
++ },
++ None => None,
++ };
++
++ #[allow(clippy::redundant_pattern_matching)]
++ if let Some(_) = Some(16) {
++ Some(16)
++ } else if let Some(x) = Some(16) {
++ // Lint starting from here
++ if x % 2 == 0 { Some(x) } else { None }
++ } else {
++ None
++ };
++
++ match Some((17, 17)) {
++ // Not linted for now could be
++ Some((x, y)) => {
++ if y != x {
++ Some((x, y))
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++
++ struct NamedTuple {
++ pub x: u8,
++ pub y: (i32, u32),
++ }
++
++ match Some(NamedTuple {
++ // Not linted for now could be
++ x: 17,
++ y: (18, 19),
++ }) {
++ Some(NamedTuple { x, y }) => {
++ if y.1 != x as u32 {
++ Some(NamedTuple { x, y })
++ } else {
++ None
++ }
++ },
++ None => None,
++ };
++}
--- /dev/null
--- /dev/null
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:7:5
++ |
++LL | / match Some(0) {
++LL | | None => None,
++LL | | Some(x) => {
++LL | | if x > 0 {
++... |
++LL | | },
++LL | | };
++ | |_____^ help: try this: `Some(0).filter(|&x| x <= 0)`
++ |
++ = note: `-D clippy::manual-filter` implied by `-D warnings`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:18:5
++ |
++LL | / match Some(1) {
++LL | | Some(x) => {
++LL | | if x > 0 {
++LL | | None
++... |
++LL | | None => None,
++LL | | };
++ | |_____^ help: try this: `Some(1).filter(|&x| x <= 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:29:5
++ |
++LL | / match Some(2) {
++LL | | Some(x) => {
++LL | | if x > 0 {
++LL | | None
++... |
++LL | | _ => None,
++LL | | };
++ | |_____^ help: try this: `Some(2).filter(|&x| x <= 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:40:5
++ |
++LL | / match Some(3) {
++LL | | Some(x) => {
++LL | | if x > 0 {
++LL | | Some(x)
++... |
++LL | | None => None,
++LL | | };
++ | |_____^ help: try this: `Some(3).filter(|&x| x > 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:52:5
++ |
++LL | / match y {
++LL | | // Some(4)
++LL | | None => None,
++LL | | Some(x) => {
++... |
++LL | | },
++LL | | };
++ | |_____^ help: try this: `y.filter(|&x| x <= 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:64:5
++ |
++LL | / match Some(5) {
++LL | | Some(x) => {
++LL | | if x > 0 {
++LL | | Some(x)
++... |
++LL | | _ => None,
++LL | | };
++ | |_____^ help: try this: `Some(5).filter(|&x| x > 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:75:5
++ |
++LL | / match Some(6) {
++LL | | Some(ref x) => {
++LL | | if x > &0 {
++LL | | Some(x)
++... |
++LL | | _ => None,
++LL | | };
++ | |_____^ help: try this: `Some(6).as_ref().filter(|&x| x > &0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:87:5
++ |
++LL | / match Some(String::new()) {
++LL | | Some(x) => {
++LL | | if external_cond {
++LL | | Some(x)
++... |
++LL | | _ => None,
++LL | | };
++ | |_____^ help: try this: `Some(String::new()).filter(|x| external_cond)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:98:5
++ |
++LL | / if let Some(x) = Some(7) {
++LL | | if external_cond { Some(x) } else { None }
++LL | | } else {
++LL | | None
++LL | | };
++ | |_____^ help: try this: `Some(7).filter(|&x| external_cond)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:104:5
++ |
++LL | / match &Some(8) {
++LL | | &Some(x) => {
++LL | | if x != 0 {
++LL | | Some(x)
++... |
++LL | | _ => None,
++LL | | };
++ | |_____^ help: try this: `Some(8).filter(|&x| x != 0)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:115:5
++ |
++LL | / match Some(9) {
++LL | | Some(x) => {
++LL | | if x > 10 && x < 100 {
++LL | | Some(x)
++... |
++LL | | None => None,
++LL | | };
++ | |_____^ help: try this: `Some(9).filter(|&x| x > 10 && x < 100)`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:141:5
++ |
++LL | / match Some(11) {
++LL | | // Lint, statement is preserved by `.filter`
++LL | | Some(x) => {
++LL | | if {
++... |
++LL | | None => None,
++LL | | };
++ | |_____^
++ |
++help: try this
++ |
++LL ~ Some(11).filter(|&x| {
++LL + println!("foo");
++LL + x > 10 && x < 100
++LL ~ });
++ |
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:185:13
++ |
++LL | let _ = match Some(14) {
++ | _____________^
++LL | | Some(x) => {
++LL | | if unsafe { f(x) } {
++LL | | Some(x)
++... |
++LL | | None => None,
++LL | | };
++ | |_____^ help: try this: `Some(14).filter(|&x| unsafe { f(x) })`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:195:13
++ |
++LL | let _ = match Some(15) {
++ | _____________^
++LL | | Some(x) => unsafe {
++LL | | if f(x) { Some(x) } else { None }
++LL | | },
++LL | | None => None,
++LL | | };
++ | |_____^ help: try this: `Some(15).filter(|&x| unsafe { f(x) })`
++
++error: manual implementation of `Option::filter`
++ --> $DIR/manual_filter.rs:205:12
++ |
++LL | } else if let Some(x) = Some(16) {
++ | ____________^
++LL | | // Lint starting from here
++LL | | if x % 2 == 0 { Some(x) } else { None }
++LL | | } else {
++LL | | None
++LL | | };
++ | |_____^ help: try this: `{ Some(16).filter(|&x| x % 2 == 0) }`
++
++error: aborting due to 15 previous errors
++
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::manual_rem_euclid)]
+
+#[macro_use]
+extern crate macro_rules;
+
+macro_rules! internal_rem_euclid {
+ () => {
+ let value: i32 = 5;
+ let _: i32 = value.rem_euclid(4);
+ };
+}
+
+fn main() {
+ let value: i32 = 5;
+
+ let _: i32 = value.rem_euclid(4);
+ let _: i32 = value.rem_euclid(4);
+ let _: i32 = value.rem_euclid(4);
+ let _: i32 = value.rem_euclid(4);
+ let _: i32 = 1 + value.rem_euclid(4);
+
+ let _: i32 = (3 + value % 4) % 4;
+ let _: i32 = (-4 + value % -4) % -4;
+ let _: i32 = ((5 % 4) + 4) % 4;
+
+ // Make sure the lint does not trigger if it would cause an error, like with an ambiguous
+ // integer type
+ let not_annotated = 24;
+ let _ = ((not_annotated % 4) + 4) % 4;
+ let inferred: _ = 24;
+ let _ = ((inferred % 4) + 4) % 4;
+
+ // For lint to apply the constant must always be on the RHS of the previous value for %
+ let _: i32 = 4 % ((value % 4) + 4);
+ let _: i32 = ((4 % value) + 4) % 4;
+
+ // Lint in internal macros
+ internal_rem_euclid!();
+
+ // Do not lint in external macros
+ manual_rem_euclid!();
+}
+
+// Should lint for params too
+pub fn rem_euclid_4(num: i32) -> i32 {
+ num.rem_euclid(4)
+}
+
+// Constant version came later, should still lint
+pub const fn const_rem_euclid_4(num: i32) -> i32 {
+ num.rem_euclid(4)
+}
++
++pub fn msrv_1_37() {
++ #![clippy::msrv = "1.37"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
++
++pub fn msrv_1_38() {
++ #![clippy::msrv = "1.38"]
++
++ let x: i32 = 10;
++ let _: i32 = x.rem_euclid(4);
++}
++
++// For const fns:
++pub const fn msrv_1_51() {
++ #![clippy::msrv = "1.51"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
++
++pub const fn msrv_1_52() {
++ #![clippy::msrv = "1.52"]
++
++ let x: i32 = 10;
++ let _: i32 = x.rem_euclid(4);
++}
--- /dev/null
+// run-rustfix
+// aux-build:macro_rules.rs
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::manual_rem_euclid)]
+
+#[macro_use]
+extern crate macro_rules;
+
+macro_rules! internal_rem_euclid {
+ () => {
+ let value: i32 = 5;
+ let _: i32 = ((value % 4) + 4) % 4;
+ };
+}
+
+fn main() {
+ let value: i32 = 5;
+
+ let _: i32 = ((value % 4) + 4) % 4;
+ let _: i32 = (4 + (value % 4)) % 4;
+ let _: i32 = (value % 4 + 4) % 4;
+ let _: i32 = (4 + value % 4) % 4;
+ let _: i32 = 1 + (4 + value % 4) % 4;
+
+ let _: i32 = (3 + value % 4) % 4;
+ let _: i32 = (-4 + value % -4) % -4;
+ let _: i32 = ((5 % 4) + 4) % 4;
+
+ // Make sure the lint does not trigger if it would cause an error, like with an ambiguous
+ // integer type
+ let not_annotated = 24;
+ let _ = ((not_annotated % 4) + 4) % 4;
+ let inferred: _ = 24;
+ let _ = ((inferred % 4) + 4) % 4;
+
+ // For lint to apply the constant must always be on the RHS of the previous value for %
+ let _: i32 = 4 % ((value % 4) + 4);
+ let _: i32 = ((4 % value) + 4) % 4;
+
+ // Lint in internal macros
+ internal_rem_euclid!();
+
+ // Do not lint in external macros
+ manual_rem_euclid!();
+}
+
+// Should lint for params too
+pub fn rem_euclid_4(num: i32) -> i32 {
+ ((num % 4) + 4) % 4
+}
+
+// Constant version came later, should still lint
+pub const fn const_rem_euclid_4(num: i32) -> i32 {
+ ((num % 4) + 4) % 4
+}
++
++pub fn msrv_1_37() {
++ #![clippy::msrv = "1.37"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
++
++pub fn msrv_1_38() {
++ #![clippy::msrv = "1.38"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
++
++// For const fns:
++pub const fn msrv_1_51() {
++ #![clippy::msrv = "1.51"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
++
++pub const fn msrv_1_52() {
++ #![clippy::msrv = "1.52"]
++
++ let x: i32 = 10;
++ let _: i32 = ((x % 4) + 4) % 4;
++}
--- /dev/null
- --> $DIR/manual_rem_euclid.rs:19:18
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:20:18
++ --> $DIR/manual_rem_euclid.rs:20:18
+ |
+LL | let _: i32 = ((value % 4) + 4) % 4;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+ |
+ = note: `-D clippy::manual-rem-euclid` implied by `-D warnings`
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:21:18
++ --> $DIR/manual_rem_euclid.rs:21:18
+ |
+LL | let _: i32 = (4 + (value % 4)) % 4;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:22:18
++ --> $DIR/manual_rem_euclid.rs:22:18
+ |
+LL | let _: i32 = (value % 4 + 4) % 4;
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:23:22
++ --> $DIR/manual_rem_euclid.rs:23:18
+ |
+LL | let _: i32 = (4 + value % 4) % 4;
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:12:22
++ --> $DIR/manual_rem_euclid.rs:24:22
+ |
+LL | let _: i32 = 1 + (4 + value % 4) % 4;
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:49:5
++ --> $DIR/manual_rem_euclid.rs:13:22
+ |
+LL | let _: i32 = ((value % 4) + 4) % 4;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: consider using: `value.rem_euclid(4)`
+...
+LL | internal_rem_euclid!();
+ | ---------------------- in this macro invocation
+ |
+ = note: this error originates in the macro `internal_rem_euclid` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: manual `rem_euclid` implementation
- --> $DIR/manual_rem_euclid.rs:54:5
++ --> $DIR/manual_rem_euclid.rs:50:5
+ |
+LL | ((num % 4) + 4) % 4
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `num.rem_euclid(4)`
+
+error: manual `rem_euclid` implementation
- error: aborting due to 8 previous errors
++ --> $DIR/manual_rem_euclid.rs:55:5
+ |
+LL | ((num % 4) + 4) % 4
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `num.rem_euclid(4)`
+
++error: manual `rem_euclid` implementation
++ --> $DIR/manual_rem_euclid.rs:69:18
++ |
++LL | let _: i32 = ((x % 4) + 4) % 4;
++ | ^^^^^^^^^^^^^^^^^ help: consider using: `x.rem_euclid(4)`
++
++error: manual `rem_euclid` implementation
++ --> $DIR/manual_rem_euclid.rs:84:18
++ |
++LL | let _: i32 = ((x % 4) + 4) % 4;
++ | ^^^^^^^^^^^^^^^^^ help: consider using: `x.rem_euclid(4)`
++
++error: aborting due to 10 previous errors
+
--- /dev/null
++#![feature(custom_inner_attributes)]
+#![warn(clippy::manual_strip)]
+
+fn main() {
+ let s = "abc";
+
+ if s.starts_with("ab") {
+ str::to_string(&s["ab".len()..]);
+ s["ab".len()..].to_string();
+
+ str::to_string(&s[2..]);
+ s[2..].to_string();
+ }
+
+ if s.ends_with("bc") {
+ str::to_string(&s[..s.len() - "bc".len()]);
+ s[..s.len() - "bc".len()].to_string();
+
+ str::to_string(&s[..s.len() - 2]);
+ s[..s.len() - 2].to_string();
+ }
+
+ // Character patterns
+ if s.starts_with('a') {
+ str::to_string(&s[1..]);
+ s[1..].to_string();
+ }
+
+ // Variable prefix
+ let prefix = "ab";
+ if s.starts_with(prefix) {
+ str::to_string(&s[prefix.len()..]);
+ }
+
+ // Constant prefix
+ const PREFIX: &str = "ab";
+ if s.starts_with(PREFIX) {
+ str::to_string(&s[PREFIX.len()..]);
+ str::to_string(&s[2..]);
+ }
+
+ // Constant target
+ const TARGET: &str = "abc";
+ if TARGET.starts_with(prefix) {
+ str::to_string(&TARGET[prefix.len()..]);
+ }
+
+ // String target - not mutated.
+ let s1: String = "abc".into();
+ if s1.starts_with("ab") {
+ s1[2..].to_uppercase();
+ }
+
+ // String target - mutated. (Don't lint.)
+ let mut s2: String = "abc".into();
+ if s2.starts_with("ab") {
+ s2.push('d');
+ s2[2..].to_uppercase();
+ }
+
+ // Target not stripped. (Don't lint.)
+ let s3 = String::from("abcd");
+ let s4 = String::from("efgh");
+ if s3.starts_with("ab") {
+ s4[2..].to_string();
+ }
+}
++
++fn msrv_1_44() {
++ #![clippy::msrv = "1.44"]
++
++ let s = "abc";
++ if s.starts_with('a') {
++ s[1..].to_string();
++ }
++}
++
++fn msrv_1_45() {
++ #![clippy::msrv = "1.45"]
++
++ let s = "abc";
++ if s.starts_with('a') {
++ s[1..].to_string();
++ }
++}
--- /dev/null
- --> $DIR/manual_strip.rs:7:24
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:6:5
++ --> $DIR/manual_strip.rs:8:24
+ |
+LL | str::to_string(&s["ab".len()..]);
+ | ^^^^^^^^^^^^^^^^
+ |
+note: the prefix was tested here
- --> $DIR/manual_strip.rs:15:24
++ --> $DIR/manual_strip.rs:7:5
+ |
+LL | if s.starts_with("ab") {
+ | ^^^^^^^^^^^^^^^^^^^^^^^
+ = note: `-D clippy::manual-strip` implied by `-D warnings`
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = s.strip_prefix("ab") {
+LL ~ str::to_string(<stripped>);
+LL ~ <stripped>.to_string();
+LL |
+LL ~ str::to_string(<stripped>);
+LL ~ <stripped>.to_string();
+ |
+
+error: stripping a suffix manually
- --> $DIR/manual_strip.rs:14:5
++ --> $DIR/manual_strip.rs:16:24
+ |
+LL | str::to_string(&s[..s.len() - "bc".len()]);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+note: the suffix was tested here
- --> $DIR/manual_strip.rs:24:24
++ --> $DIR/manual_strip.rs:15:5
+ |
+LL | if s.ends_with("bc") {
+ | ^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_suffix` method
+ |
+LL ~ if let Some(<stripped>) = s.strip_suffix("bc") {
+LL ~ str::to_string(<stripped>);
+LL ~ <stripped>.to_string();
+LL |
+LL ~ str::to_string(<stripped>);
+LL ~ <stripped>.to_string();
+ |
+
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:23:5
++ --> $DIR/manual_strip.rs:25:24
+ |
+LL | str::to_string(&s[1..]);
+ | ^^^^^^^
+ |
+note: the prefix was tested here
- --> $DIR/manual_strip.rs:31:24
++ --> $DIR/manual_strip.rs:24:5
+ |
+LL | if s.starts_with('a') {
+ | ^^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = s.strip_prefix('a') {
+LL ~ str::to_string(<stripped>);
+LL ~ <stripped>.to_string();
+ |
+
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:30:5
++ --> $DIR/manual_strip.rs:32:24
+ |
+LL | str::to_string(&s[prefix.len()..]);
+ | ^^^^^^^^^^^^^^^^^^
+ |
+note: the prefix was tested here
- --> $DIR/manual_strip.rs:37:24
++ --> $DIR/manual_strip.rs:31:5
+ |
+LL | if s.starts_with(prefix) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = s.strip_prefix(prefix) {
+LL ~ str::to_string(<stripped>);
+ |
+
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:36:5
++ --> $DIR/manual_strip.rs:38:24
+ |
+LL | str::to_string(&s[PREFIX.len()..]);
+ | ^^^^^^^^^^^^^^^^^^
+ |
+note: the prefix was tested here
- --> $DIR/manual_strip.rs:44:24
++ --> $DIR/manual_strip.rs:37:5
+ |
+LL | if s.starts_with(PREFIX) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = s.strip_prefix(PREFIX) {
+LL ~ str::to_string(<stripped>);
+LL ~ str::to_string(<stripped>);
+ |
+
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:43:5
++ --> $DIR/manual_strip.rs:45:24
+ |
+LL | str::to_string(&TARGET[prefix.len()..]);
+ | ^^^^^^^^^^^^^^^^^^^^^^^
+ |
+note: the prefix was tested here
- --> $DIR/manual_strip.rs:50:9
++ --> $DIR/manual_strip.rs:44:5
+ |
+LL | if TARGET.starts_with(prefix) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = TARGET.strip_prefix(prefix) {
+LL ~ str::to_string(<stripped>);
+ |
+
+error: stripping a prefix manually
- --> $DIR/manual_strip.rs:49:5
++ --> $DIR/manual_strip.rs:51:9
+ |
+LL | s1[2..].to_uppercase();
+ | ^^^^^^^
+ |
+note: the prefix was tested here
- error: aborting due to 7 previous errors
++ --> $DIR/manual_strip.rs:50:5
+ |
+LL | if s1.starts_with("ab") {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+help: try using the `strip_prefix` method
+ |
+LL ~ if let Some(<stripped>) = s1.strip_prefix("ab") {
+LL ~ <stripped>.to_uppercase();
+ |
+
++error: stripping a prefix manually
++ --> $DIR/manual_strip.rs:83:9
++ |
++LL | s[1..].to_string();
++ | ^^^^^^
++ |
++note: the prefix was tested here
++ --> $DIR/manual_strip.rs:82:5
++ |
++LL | if s.starts_with('a') {
++ | ^^^^^^^^^^^^^^^^^^^^^^
++help: try using the `strip_prefix` method
++ |
++LL ~ if let Some(<stripped>) = s.strip_prefix('a') {
++LL ~ <stripped>.to_string();
++ |
++
++error: aborting due to 8 previous errors
+
--- /dev/null
- #![allow(clippy::uninlined_format_args)]
+// aux-build:option_helpers.rs
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::map_unwrap_or)]
++#![allow(clippy::uninlined_format_args, clippy::unnecessary_lazy_evaluations)]
+
+#[macro_use]
+extern crate option_helpers;
+
+use std::collections::HashMap;
+
+#[rustfmt::skip]
+fn option_methods() {
+ let opt = Some(1);
+
+ // Check for `option.map(_).unwrap_or(_)` use.
+ // Single line case.
+ let _ = opt.map(|x| x + 1)
+ // Should lint even though this call is on a separate line.
+ .unwrap_or(0);
+ // Multi-line cases.
+ let _ = opt.map(|x| {
+ x + 1
+ }
+ ).unwrap_or(0);
+ let _ = opt.map(|x| x + 1)
+ .unwrap_or({
+ 0
+ });
+ // Single line `map(f).unwrap_or(None)` case.
+ let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
+ // Multi-line `map(f).unwrap_or(None)` cases.
+ let _ = opt.map(|x| {
+ Some(x + 1)
+ }
+ ).unwrap_or(None);
+ let _ = opt
+ .map(|x| Some(x + 1))
+ .unwrap_or(None);
+ // macro case
+ let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
+
+ // Should not lint if not copyable
+ let id: String = "identifier".to_string();
+ let _ = Some("prefix").map(|p| format!("{}.{}", p, id)).unwrap_or(id);
+ // ...but DO lint if the `unwrap_or` argument is not used in the `map`
+ let id: String = "identifier".to_string();
+ let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
+
+ // Check for `option.map(_).unwrap_or_else(_)` use.
+ // Multi-line cases.
+ let _ = opt.map(|x| {
+ x + 1
+ }
+ ).unwrap_or_else(|| 0);
+ let _ = opt.map(|x| x + 1)
+ .unwrap_or_else(||
+ 0
+ );
+}
+
+#[rustfmt::skip]
+fn result_methods() {
+ let res: Result<i32, ()> = Ok(1);
+
+ // Check for `result.map(_).unwrap_or_else(_)` use.
+ // multi line cases
+ let _ = res.map(|x| {
+ x + 1
+ }
+ ).unwrap_or_else(|_e| 0);
+ let _ = res.map(|x| x + 1)
+ .unwrap_or_else(|_e| {
+ 0
+ });
+ // macro case
+ let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|_e| 0); // should not lint
+}
+
+fn main() {
+ option_methods();
+ result_methods();
+}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ let res: Result<i32, ()> = Ok(1);
++
++ let _ = res.map(|x| x + 1).unwrap_or_else(|_e| 0);
++}
++
++fn msrv_1_41() {
++ #![clippy::msrv = "1.41"]
++
++ let res: Result<i32, ()> = Ok(1);
++
++ let _ = res.map(|x| x + 1).unwrap_or_else(|_e| 0);
++}
--- /dev/null
- --> $DIR/map_unwrap_or.rs:16:13
+error: called `map(<f>).unwrap_or(<a>)` on an `Option` value. This can be done more directly by calling `map_or(<a>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:20:13
++ --> $DIR/map_unwrap_or.rs:18:13
+ |
+LL | let _ = opt.map(|x| x + 1)
+ | _____________^
+LL | | // Should lint even though this call is on a separate line.
+LL | | .unwrap_or(0);
+ | |_____________________^
+ |
+ = note: `-D clippy::map-unwrap-or` implied by `-D warnings`
+help: use `map_or(<a>, <f>)` instead
+ |
+LL - let _ = opt.map(|x| x + 1)
+LL + let _ = opt.map_or(0, |x| x + 1);
+ |
+
+error: called `map(<f>).unwrap_or(<a>)` on an `Option` value. This can be done more directly by calling `map_or(<a>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:24:13
++ --> $DIR/map_unwrap_or.rs:22:13
+ |
+LL | let _ = opt.map(|x| {
+ | _____________^
+LL | | x + 1
+LL | | }
+LL | | ).unwrap_or(0);
+ | |__________________^
+ |
+help: use `map_or(<a>, <f>)` instead
+ |
+LL ~ let _ = opt.map_or(0, |x| {
+LL | x + 1
+LL | }
+LL ~ );
+ |
+
+error: called `map(<f>).unwrap_or(<a>)` on an `Option` value. This can be done more directly by calling `map_or(<a>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:29:13
++ --> $DIR/map_unwrap_or.rs:26:13
+ |
+LL | let _ = opt.map(|x| x + 1)
+ | _____________^
+LL | | .unwrap_or({
+LL | | 0
+LL | | });
+ | |__________^
+ |
+help: use `map_or(<a>, <f>)` instead
+ |
+LL ~ let _ = opt.map_or({
+LL + 0
+LL ~ }, |x| x + 1);
+ |
+
+error: called `map(<f>).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(<f>)` instead
- --> $DIR/map_unwrap_or.rs:31:13
++ --> $DIR/map_unwrap_or.rs:31:13
+ |
+LL | let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `and_then(<f>)` instead
+ |
+LL - let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
+LL + let _ = opt.and_then(|x| Some(x + 1));
+ |
+
+error: called `map(<f>).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(<f>)` instead
- --> $DIR/map_unwrap_or.rs:35:13
++ --> $DIR/map_unwrap_or.rs:33:13
+ |
+LL | let _ = opt.map(|x| {
+ | _____________^
+LL | | Some(x + 1)
+LL | | }
+LL | | ).unwrap_or(None);
+ | |_____________________^
+ |
+help: use `and_then(<f>)` instead
+ |
+LL ~ let _ = opt.and_then(|x| {
+LL | Some(x + 1)
+LL | }
+LL ~ );
+ |
+
+error: called `map(<f>).unwrap_or(None)` on an `Option` value. This can be done more directly by calling `and_then(<f>)` instead
- --> $DIR/map_unwrap_or.rs:46:13
++ --> $DIR/map_unwrap_or.rs:37:13
+ |
+LL | let _ = opt
+ | _____________^
+LL | | .map(|x| Some(x + 1))
+LL | | .unwrap_or(None);
+ | |________________________^
+ |
+help: use `and_then(<f>)` instead
+ |
+LL - .map(|x| Some(x + 1))
+LL + .and_then(|x| Some(x + 1));
+ |
+
+error: called `map(<f>).unwrap_or(<a>)` on an `Option` value. This can be done more directly by calling `map_or(<a>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:50:13
++ --> $DIR/map_unwrap_or.rs:48:13
+ |
+LL | let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `map_or(<a>, <f>)` instead
+ |
+LL - let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
+LL + let _ = Some("prefix").map_or(id, |p| format!("{}.", p));
+ |
+
+error: called `map(<f>).unwrap_or_else(<g>)` on an `Option` value. This can be done more directly by calling `map_or_else(<g>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:54:13
++ --> $DIR/map_unwrap_or.rs:52:13
+ |
+LL | let _ = opt.map(|x| {
+ | _____________^
+LL | | x + 1
+LL | | }
+LL | | ).unwrap_or_else(|| 0);
+ | |__________________________^
+
+error: called `map(<f>).unwrap_or_else(<g>)` on an `Option` value. This can be done more directly by calling `map_or_else(<g>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:66:13
++ --> $DIR/map_unwrap_or.rs:56:13
+ |
+LL | let _ = opt.map(|x| x + 1)
+ | _____________^
+LL | | .unwrap_or_else(||
+LL | | 0
+LL | | );
+ | |_________^
+
+error: called `map(<f>).unwrap_or_else(<g>)` on a `Result` value. This can be done more directly by calling `.map_or_else(<g>, <f>)` instead
- --> $DIR/map_unwrap_or.rs:70:13
++ --> $DIR/map_unwrap_or.rs:68:13
+ |
+LL | let _ = res.map(|x| {
+ | _____________^
+LL | | x + 1
+LL | | }
+LL | | ).unwrap_or_else(|_e| 0);
+ | |____________________________^
+
+error: called `map(<f>).unwrap_or_else(<g>)` on a `Result` value. This can be done more directly by calling `.map_or_else(<g>, <f>)` instead
- error: aborting due to 11 previous errors
++ --> $DIR/map_unwrap_or.rs:72:13
+ |
+LL | let _ = res.map(|x| x + 1)
+ | _____________^
+LL | | .unwrap_or_else(|_e| {
+LL | | 0
+LL | | });
+ | |__________^
+
++error: called `map(<f>).unwrap_or_else(<g>)` on a `Result` value. This can be done more directly by calling `.map_or_else(<g>, <f>)` instead
++ --> $DIR/map_unwrap_or.rs:98:13
++ |
++LL | let _ = res.map(|x| x + 1).unwrap_or_else(|_e| 0);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `res.map_or_else(|_e| 0, |x| x + 1)`
++
++error: aborting due to 12 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::match_like_matches_macro)]
+#![allow(unreachable_patterns, dead_code, clippy::equatable_if_let)]
+
+fn main() {
+ let x = Some(5);
+
+ // Lint
+ let _y = matches!(x, Some(0));
+
+ // Lint
+ let _w = matches!(x, Some(_));
+
+ // Turn into is_none
+ let _z = x.is_none();
+
+ // Lint
+ let _zz = !matches!(x, Some(r) if r == 0);
+
+ // Lint
+ let _zzz = matches!(x, Some(5));
+
+ // No lint
+ let _a = match x {
+ Some(_) => false,
+ _ => false,
+ };
+
+ // No lint
+ let _ab = match x {
+ Some(0) => false,
+ _ => true,
+ None => false,
+ };
+
+ enum E {
+ A(u32),
+ B(i32),
+ C,
+ D,
+ }
+ let x = E::A(2);
+ {
+ // lint
+ let _ans = matches!(x, E::A(_) | E::B(_));
+ }
+ {
+ // lint
+ // skip rustfmt to prevent removing block for first pattern
+ #[rustfmt::skip]
+ let _ans = matches!(x, E::A(_) | E::B(_));
+ }
+ {
+ // lint
+ let _ans = !matches!(x, E::B(_) | E::C);
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(_) => false,
+ E::C => true,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => true,
+ E::B(_) => false,
+ E::C => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(a) if a < 10 => false,
+ E::B(a) if a < 10 => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(a) if a < 10 => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(a) => a == 10,
+ E::B(_) => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(_) => true,
+ _ => false,
+ };
+ }
+
+ {
+ // should print "z" in suggestion (#6503)
+ let z = &Some(3);
+ let _z = matches!(z, Some(3));
+ }
+
+ {
+ // this could also print "z" in suggestion..?
+ let z = Some(3);
+ let _z = matches!(&z, Some(3));
+ }
+
+ {
+ enum AnEnum {
+ X,
+ Y,
+ }
+
+ fn foo(_x: AnEnum) {}
+
+ fn main() {
+ let z = AnEnum::X;
+ // we can't remove the reference here!
+ let _ = matches!(&z, AnEnum::X);
+ foo(z);
+ }
+ }
+
+ {
+ struct S(i32);
+
+ fn fun(_val: Option<S>) {}
+ let val = Some(S(42));
+ // we need the reference here because later val is consumed by fun()
+ let _res = matches!(&val, &Some(ref _a));
+ fun(val);
+ }
+
+ {
+ struct S(i32);
+
+ fn fun(_val: Option<S>) {}
+ let val = Some(S(42));
+ let _res = matches!(&val, &Some(ref _a));
+ fun(val);
+ }
+
+ {
+ enum E {
+ A,
+ B,
+ C,
+ }
+
+ let _ = match E::A {
+ E::B => true,
+ #[cfg(feature = "foo")]
+ E::A => true,
+ _ => false,
+ };
+ }
+
+ let x = ' ';
+ // ignore if match block contains comment
+ let _line_comments = match x {
+ // numbers are bad!
+ '1' | '2' | '3' => true,
+ // spaces are very important to be true.
+ ' ' => true,
+ // as are dots
+ '.' => true,
+ _ => false,
+ };
+
+ let _block_comments = match x {
+ /* numbers are bad!
+ */
+ '1' | '2' | '3' => true,
+ /* spaces are very important to be true.
+ */
+ ' ' => true,
+ /* as are dots
+ */
+ '.' => true,
+ _ => false,
+ };
+}
++
++fn msrv_1_41() {
++ #![clippy::msrv = "1.41"]
++
++ let _y = match Some(5) {
++ Some(0) => true,
++ _ => false,
++ };
++}
++
++fn msrv_1_42() {
++ #![clippy::msrv = "1.42"]
++
++ let _y = matches!(Some(5), Some(0));
++}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::match_like_matches_macro)]
+#![allow(unreachable_patterns, dead_code, clippy::equatable_if_let)]
+
+fn main() {
+ let x = Some(5);
+
+ // Lint
+ let _y = match x {
+ Some(0) => true,
+ _ => false,
+ };
+
+ // Lint
+ let _w = match x {
+ Some(_) => true,
+ _ => false,
+ };
+
+ // Turn into is_none
+ let _z = match x {
+ Some(_) => false,
+ None => true,
+ };
+
+ // Lint
+ let _zz = match x {
+ Some(r) if r == 0 => false,
+ _ => true,
+ };
+
+ // Lint
+ let _zzz = if let Some(5) = x { true } else { false };
+
+ // No lint
+ let _a = match x {
+ Some(_) => false,
+ _ => false,
+ };
+
+ // No lint
+ let _ab = match x {
+ Some(0) => false,
+ _ => true,
+ None => false,
+ };
+
+ enum E {
+ A(u32),
+ B(i32),
+ C,
+ D,
+ }
+ let x = E::A(2);
+ {
+ // lint
+ let _ans = match x {
+ E::A(_) => true,
+ E::B(_) => true,
+ _ => false,
+ };
+ }
+ {
+ // lint
+ // skip rustfmt to prevent removing block for first pattern
+ #[rustfmt::skip]
+ let _ans = match x {
+ E::A(_) => {
+ true
+ }
+ E::B(_) => true,
+ _ => false,
+ };
+ }
+ {
+ // lint
+ let _ans = match x {
+ E::B(_) => false,
+ E::C => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(_) => false,
+ E::C => true,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => true,
+ E::B(_) => false,
+ E::C => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(a) if a < 10 => false,
+ E::B(a) if a < 10 => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(a) if a < 10 => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(a) => a == 10,
+ E::B(_) => false,
+ _ => true,
+ };
+ }
+ {
+ // no lint
+ let _ans = match x {
+ E::A(_) => false,
+ E::B(_) => true,
+ _ => false,
+ };
+ }
+
+ {
+ // should print "z" in suggestion (#6503)
+ let z = &Some(3);
+ let _z = match &z {
+ Some(3) => true,
+ _ => false,
+ };
+ }
+
+ {
+ // this could also print "z" in suggestion..?
+ let z = Some(3);
+ let _z = match &z {
+ Some(3) => true,
+ _ => false,
+ };
+ }
+
+ {
+ enum AnEnum {
+ X,
+ Y,
+ }
+
+ fn foo(_x: AnEnum) {}
+
+ fn main() {
+ let z = AnEnum::X;
+ // we can't remove the reference here!
+ let _ = match &z {
+ AnEnum::X => true,
+ _ => false,
+ };
+ foo(z);
+ }
+ }
+
+ {
+ struct S(i32);
+
+ fn fun(_val: Option<S>) {}
+ let val = Some(S(42));
+ // we need the reference here because later val is consumed by fun()
+ let _res = match &val {
+ &Some(ref _a) => true,
+ _ => false,
+ };
+ fun(val);
+ }
+
+ {
+ struct S(i32);
+
+ fn fun(_val: Option<S>) {}
+ let val = Some(S(42));
+ let _res = match &val {
+ &Some(ref _a) => true,
+ _ => false,
+ };
+ fun(val);
+ }
+
+ {
+ enum E {
+ A,
+ B,
+ C,
+ }
+
+ let _ = match E::A {
+ E::B => true,
+ #[cfg(feature = "foo")]
+ E::A => true,
+ _ => false,
+ };
+ }
+
+ let x = ' ';
+ // ignore if match block contains comment
+ let _line_comments = match x {
+ // numbers are bad!
+ '1' | '2' | '3' => true,
+ // spaces are very important to be true.
+ ' ' => true,
+ // as are dots
+ '.' => true,
+ _ => false,
+ };
+
+ let _block_comments = match x {
+ /* numbers are bad!
+ */
+ '1' | '2' | '3' => true,
+ /* spaces are very important to be true.
+ */
+ ' ' => true,
+ /* as are dots
+ */
+ '.' => true,
+ _ => false,
+ };
+}
++
++fn msrv_1_41() {
++ #![clippy::msrv = "1.41"]
++
++ let _y = match Some(5) {
++ Some(0) => true,
++ _ => false,
++ };
++}
++
++fn msrv_1_42() {
++ #![clippy::msrv = "1.42"]
++
++ let _y = match Some(5) {
++ Some(0) => true,
++ _ => false,
++ };
++}
--- /dev/null
- --> $DIR/match_expr_like_matches_macro.rs:10:14
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:16:14
++ --> $DIR/match_expr_like_matches_macro.rs:11:14
+ |
+LL | let _y = match x {
+ | ______________^
+LL | | Some(0) => true,
+LL | | _ => false,
+LL | | };
+ | |_____^ help: try this: `matches!(x, Some(0))`
+ |
+ = note: `-D clippy::match-like-matches-macro` implied by `-D warnings`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:22:14
++ --> $DIR/match_expr_like_matches_macro.rs:17:14
+ |
+LL | let _w = match x {
+ | ______________^
+LL | | Some(_) => true,
+LL | | _ => false,
+LL | | };
+ | |_____^ help: try this: `matches!(x, Some(_))`
+
+error: redundant pattern matching, consider using `is_none()`
- --> $DIR/match_expr_like_matches_macro.rs:28:15
++ --> $DIR/match_expr_like_matches_macro.rs:23:14
+ |
+LL | let _z = match x {
+ | ______________^
+LL | | Some(_) => false,
+LL | | None => true,
+LL | | };
+ | |_____^ help: try this: `x.is_none()`
+ |
+ = note: `-D clippy::redundant-pattern-matching` implied by `-D warnings`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:34:16
++ --> $DIR/match_expr_like_matches_macro.rs:29:15
+ |
+LL | let _zz = match x {
+ | _______________^
+LL | | Some(r) if r == 0 => false,
+LL | | _ => true,
+LL | | };
+ | |_____^ help: try this: `!matches!(x, Some(r) if r == 0)`
+
+error: if let .. else expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:58:20
++ --> $DIR/match_expr_like_matches_macro.rs:35:16
+ |
+LL | let _zzz = if let Some(5) = x { true } else { false };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `matches!(x, Some(5))`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:68:20
++ --> $DIR/match_expr_like_matches_macro.rs:59:20
+ |
+LL | let _ans = match x {
+ | ____________________^
+LL | | E::A(_) => true,
+LL | | E::B(_) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(x, E::A(_) | E::B(_))`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:78:20
++ --> $DIR/match_expr_like_matches_macro.rs:69:20
+ |
+LL | let _ans = match x {
+ | ____________________^
+LL | | E::A(_) => {
+LL | | true
+LL | | }
+LL | | E::B(_) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(x, E::A(_) | E::B(_))`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:138:18
++ --> $DIR/match_expr_like_matches_macro.rs:79:20
+ |
+LL | let _ans = match x {
+ | ____________________^
+LL | | E::B(_) => false,
+LL | | E::C => false,
+LL | | _ => true,
+LL | | };
+ | |_________^ help: try this: `!matches!(x, E::B(_) | E::C)`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:147:18
++ --> $DIR/match_expr_like_matches_macro.rs:139:18
+ |
+LL | let _z = match &z {
+ | __________________^
+LL | | Some(3) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(z, Some(3))`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:164:21
++ --> $DIR/match_expr_like_matches_macro.rs:148:18
+ |
+LL | let _z = match &z {
+ | __________________^
+LL | | Some(3) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(&z, Some(3))`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:178:20
++ --> $DIR/match_expr_like_matches_macro.rs:165:21
+ |
+LL | let _ = match &z {
+ | _____________________^
+LL | | AnEnum::X => true,
+LL | | _ => false,
+LL | | };
+ | |_____________^ help: try this: `matches!(&z, AnEnum::X)`
+
+error: match expression looks like `matches!` macro
- --> $DIR/match_expr_like_matches_macro.rs:190:20
++ --> $DIR/match_expr_like_matches_macro.rs:179:20
+ |
+LL | let _res = match &val {
+ | ____________________^
+LL | | &Some(ref _a) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(&val, &Some(ref _a))`
+
+error: match expression looks like `matches!` macro
- error: aborting due to 13 previous errors
++ --> $DIR/match_expr_like_matches_macro.rs:191:20
+ |
+LL | let _res = match &val {
+ | ____________________^
+LL | | &Some(ref _a) => true,
+LL | | _ => false,
+LL | | };
+ | |_________^ help: try this: `matches!(&val, &Some(ref _a))`
+
++error: match expression looks like `matches!` macro
++ --> $DIR/match_expr_like_matches_macro.rs:251:14
++ |
++LL | let _y = match Some(5) {
++ | ______________^
++LL | | Some(0) => true,
++LL | | _ => false,
++LL | | };
++ | |_____^ help: try this: `matches!(Some(5), Some(0))`
++
++error: aborting due to 14 previous errors
+
--- /dev/null
-
+#![feature(exclusive_range_pattern)]
+#![warn(clippy::match_overlapping_arm)]
+#![allow(clippy::redundant_pattern_matching)]
+#![allow(clippy::if_same_then_else, clippy::equatable_if_let)]
+
+/// Tests for match_overlapping_arm
+
+fn overlapping() {
+ const FOO: u64 = 2;
+
+ match 42 {
+ 0..=10 => println!("0..=10"),
+ 0..=11 => println!("0..=11"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..=5 => println!("0..=5"),
+ 6..=7 => println!("6..=7"),
+ FOO..=11 => println!("FOO..=11"),
+ _ => (),
+ }
+
+ match 42 {
+ 2 => println!("2"),
+ 0..=5 => println!("0..=5"),
+ _ => (),
+ }
+
+ match 42 {
+ 2 => println!("2"),
+ 0..=2 => println!("0..=2"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..=10 => println!("0..=10"),
+ 11..=50 => println!("11..=50"),
+ _ => (),
+ }
+
+ match 42 {
+ 2 => println!("2"),
+ 0..2 => println!("0..2"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..10 => println!("0..10"),
+ 10..50 => println!("10..50"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..11 => println!("0..11"),
+ 0..=11 => println!("0..=11"),
+ _ => (),
+ }
+
+ match 42 {
+ 5..7 => println!("5..7"),
+ 0..10 => println!("0..10"),
+ _ => (),
+ }
+
+ match 42 {
+ 5..10 => println!("5..10"),
+ 0..=10 => println!("0..=10"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..14 => println!("0..14"),
+ 5..10 => println!("5..10"),
+ _ => (),
+ }
+
+ match 42 {
+ 5..14 => println!("5..14"),
+ 0..=10 => println!("0..=10"),
+ _ => (),
+ }
+
+ match 42 {
+ 0..7 => println!("0..7"),
+ 0..=10 => println!("0..=10"),
+ _ => (),
+ }
+
+ match 42 {
+ 3.. => println!("3.."),
+ 0.. => println!("0.."),
+ _ => (),
+ }
+
+ match 42 {
+ ..=23 => println!("..=23"),
+ ..26 => println!("..26"),
+ _ => (),
+ }
+
+ // Issue #7816 - overlap after included range
+ match 42 {
+ 5..=10 => (),
+ 0..=20 => (),
+ 21..=30 => (),
+ 21..=40 => (),
+ _ => (),
+ }
+
+ // Issue #7829
+ match 0 {
+ -1..=1 => (),
+ -2..=2 => (),
+ _ => (),
+ }
+
+ // Only warn about the first if there are multiple overlaps
+ match 42u128 {
+ 0..=0x0000_0000_0000_00ff => (),
+ 0..=0x0000_0000_0000_ffff => (),
+ 0..=0x0000_0000_ffff_ffff => (),
+ 0..=0xffff_ffff_ffff_ffff => (),
+ _ => (),
+ }
+
+ if let None = Some(42) {
+ // nothing
+ } else if let None = Some(42) {
+ // another nothing :-)
+ }
+}
+
+fn main() {}
--- /dev/null
- --> $DIR/match_overlapping_arm.rs:13:9
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:14:9
++ --> $DIR/match_overlapping_arm.rs:12:9
+ |
+LL | 0..=10 => println!("0..=10"),
+ | ^^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:19:9
++ --> $DIR/match_overlapping_arm.rs:13:9
+ |
+LL | 0..=11 => println!("0..=11"),
+ | ^^^^^^
+ = note: `-D clippy::match-overlapping-arm` implied by `-D warnings`
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:21:9
++ --> $DIR/match_overlapping_arm.rs:18:9
+ |
+LL | 0..=5 => println!("0..=5"),
+ | ^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:56:9
++ --> $DIR/match_overlapping_arm.rs:20:9
+ |
+LL | FOO..=11 => println!("FOO..=11"),
+ | ^^^^^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:57:9
++ --> $DIR/match_overlapping_arm.rs:55:9
+ |
+LL | 0..11 => println!("0..11"),
+ | ^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:81:9
++ --> $DIR/match_overlapping_arm.rs:56:9
+ |
+LL | 0..=11 => println!("0..=11"),
+ | ^^^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:80:9
++ --> $DIR/match_overlapping_arm.rs:80:9
+ |
+LL | 0..=10 => println!("0..=10"),
+ | ^^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:86:9
++ --> $DIR/match_overlapping_arm.rs:79:9
+ |
+LL | 5..14 => println!("5..14"),
+ | ^^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:87:9
++ --> $DIR/match_overlapping_arm.rs:85:9
+ |
+LL | 0..7 => println!("0..7"),
+ | ^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:98:9
++ --> $DIR/match_overlapping_arm.rs:86:9
+ |
+LL | 0..=10 => println!("0..=10"),
+ | ^^^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:99:9
++ --> $DIR/match_overlapping_arm.rs:97:9
+ |
+LL | ..=23 => println!("..=23"),
+ | ^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:107:9
++ --> $DIR/match_overlapping_arm.rs:98:9
+ |
+LL | ..26 => println!("..26"),
+ | ^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:108:9
++ --> $DIR/match_overlapping_arm.rs:106:9
+ |
+LL | 21..=30 => (),
+ | ^^^^^^^
+ |
+note: overlaps with this
- --> $DIR/match_overlapping_arm.rs:121:9
++ --> $DIR/match_overlapping_arm.rs:107:9
+ |
+LL | 21..=40 => (),
+ | ^^^^^^^
+
+error: some ranges overlap
- --> $DIR/match_overlapping_arm.rs:122:9
++ --> $DIR/match_overlapping_arm.rs:120:9
+ |
+LL | 0..=0x0000_0000_0000_00ff => (),
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+note: overlaps with this
++ --> $DIR/match_overlapping_arm.rs:121:9
+ |
+LL | 0..=0x0000_0000_0000_ffff => (),
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 8 previous errors
+
--- /dev/null
+// run-rustfix
+#![warn(clippy::match_single_binding)]
+#![allow(unused_variables)]
+#![allow(clippy::toplevel_ref_arg, clippy::uninlined_format_args)]
+
+struct Point {
+ x: i32,
+ y: i32,
+}
+
+fn coords() -> Point {
+ Point { x: 1, y: 2 }
+}
+
+macro_rules! foo {
+ ($param:expr) => {
+ match $param {
+ _ => println!("whatever"),
+ }
+ };
+}
+
+fn main() {
+ let a = 1;
+ let b = 2;
+ let c = 3;
+ // Lint
+ let (x, y, z) = (a, b, c);
+ {
+ println!("{} {} {}", x, y, z);
+ }
+ // Lint
+ let (x, y, z) = (a, b, c);
+ println!("{} {} {}", x, y, z);
+ // Ok
+ foo!(a);
+ // Ok
+ match a {
+ 2 => println!("2"),
+ _ => println!("Not 2"),
+ }
+ // Ok
+ let d = Some(5);
+ match d {
+ Some(d) => println!("{}", d),
+ _ => println!("None"),
+ }
+ // Lint
+ println!("whatever");
+ // Lint
+ {
+ let x = 29;
+ println!("x has a value of {}", x);
+ }
+ // Lint
+ {
+ let e = 5 * a;
+ if e >= 5 {
+ println!("e is superior to 5");
+ }
+ }
+ // Lint
+ let p = Point { x: 0, y: 7 };
+ let Point { x, y } = p;
+ println!("Coords: ({}, {})", x, y);
+ // Lint
+ let Point { x: x1, y: y1 } = p;
+ println!("Coords: ({}, {})", x1, y1);
+ // Lint
+ let x = 5;
+ let ref r = x;
+ println!("Got a reference to {}", r);
+ // Lint
+ let mut x = 5;
+ let ref mut mr = x;
+ println!("Got a mutable reference to {}", mr);
+ // Lint
+ let Point { x, y } = coords();
+ let product = x * y;
+ // Lint
+ let v = vec![Some(1), Some(2), Some(3), Some(4)];
+ #[allow(clippy::let_and_return)]
+ let _ = v
+ .iter()
+ .map(|i| {
+ let unwrapped = i.unwrap();
+ unwrapped
+ })
+ .collect::<Vec<u8>>();
+ // Ok
+ let x = 1;
+ match x {
+ #[cfg(disabled_feature)]
+ 0 => println!("Disabled branch"),
+ _ => println!("Enabled branch"),
+ }
+
+ // Ok
+ let x = 1;
+ let y = 1;
+ match match y {
+ 0 => 1,
+ _ => 2,
+ } {
+ #[cfg(disabled_feature)]
+ 0 => println!("Array index start"),
+ _ => println!("Not an array index start"),
+ }
+
+ // Lint
+ let x = 1;
+ println!("Not an array index start");
+}
+
+#[allow(dead_code)]
+fn issue_8723() {
+ let (mut val, idx) = ("a b", 1);
+
+ let (pre, suf) = val.split_at(idx);
+ val = {
+ println!("{}", pre);
+ suf
+ };
+
+ let _ = val;
+}
++
++#[allow(dead_code)]
++fn issue_9575() {
++ fn side_effects() {}
++ let _ = || {
++ side_effects();
++ println!("Needs curlies");
++ };
++}
--- /dev/null
+// run-rustfix
+#![warn(clippy::match_single_binding)]
+#![allow(unused_variables)]
+#![allow(clippy::toplevel_ref_arg, clippy::uninlined_format_args)]
+
+struct Point {
+ x: i32,
+ y: i32,
+}
+
+fn coords() -> Point {
+ Point { x: 1, y: 2 }
+}
+
+macro_rules! foo {
+ ($param:expr) => {
+ match $param {
+ _ => println!("whatever"),
+ }
+ };
+}
+
+fn main() {
+ let a = 1;
+ let b = 2;
+ let c = 3;
+ // Lint
+ match (a, b, c) {
+ (x, y, z) => {
+ println!("{} {} {}", x, y, z);
+ },
+ }
+ // Lint
+ match (a, b, c) {
+ (x, y, z) => println!("{} {} {}", x, y, z),
+ }
+ // Ok
+ foo!(a);
+ // Ok
+ match a {
+ 2 => println!("2"),
+ _ => println!("Not 2"),
+ }
+ // Ok
+ let d = Some(5);
+ match d {
+ Some(d) => println!("{}", d),
+ _ => println!("None"),
+ }
+ // Lint
+ match a {
+ _ => println!("whatever"),
+ }
+ // Lint
+ match a {
+ _ => {
+ let x = 29;
+ println!("x has a value of {}", x);
+ },
+ }
+ // Lint
+ match a {
+ _ => {
+ let e = 5 * a;
+ if e >= 5 {
+ println!("e is superior to 5");
+ }
+ },
+ }
+ // Lint
+ let p = Point { x: 0, y: 7 };
+ match p {
+ Point { x, y } => println!("Coords: ({}, {})", x, y),
+ }
+ // Lint
+ match p {
+ Point { x: x1, y: y1 } => println!("Coords: ({}, {})", x1, y1),
+ }
+ // Lint
+ let x = 5;
+ match x {
+ ref r => println!("Got a reference to {}", r),
+ }
+ // Lint
+ let mut x = 5;
+ match x {
+ ref mut mr => println!("Got a mutable reference to {}", mr),
+ }
+ // Lint
+ let product = match coords() {
+ Point { x, y } => x * y,
+ };
+ // Lint
+ let v = vec![Some(1), Some(2), Some(3), Some(4)];
+ #[allow(clippy::let_and_return)]
+ let _ = v
+ .iter()
+ .map(|i| match i.unwrap() {
+ unwrapped => unwrapped,
+ })
+ .collect::<Vec<u8>>();
+ // Ok
+ let x = 1;
+ match x {
+ #[cfg(disabled_feature)]
+ 0 => println!("Disabled branch"),
+ _ => println!("Enabled branch"),
+ }
+
+ // Ok
+ let x = 1;
+ let y = 1;
+ match match y {
+ 0 => 1,
+ _ => 2,
+ } {
+ #[cfg(disabled_feature)]
+ 0 => println!("Array index start"),
+ _ => println!("Not an array index start"),
+ }
+
+ // Lint
+ let x = 1;
+ match x {
+ // =>
+ _ => println!("Not an array index start"),
+ }
+}
+
+#[allow(dead_code)]
+fn issue_8723() {
+ let (mut val, idx) = ("a b", 1);
+
+ val = match val.split_at(idx) {
+ (pre, suf) => {
+ println!("{}", pre);
+ suf
+ },
+ };
+
+ let _ = val;
+}
++
++#[allow(dead_code)]
++fn issue_9575() {
++ fn side_effects() {}
++ let _ = || match side_effects() {
++ _ => println!("Needs curlies"),
++ };
++}
--- /dev/null
- error: aborting due to 13 previous errors
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:28:5
+ |
+LL | / match (a, b, c) {
+LL | | (x, y, z) => {
+LL | | println!("{} {} {}", x, y, z);
+LL | | },
+LL | | }
+ | |_____^
+ |
+ = note: `-D clippy::match-single-binding` implied by `-D warnings`
+help: consider using a `let` statement
+ |
+LL ~ let (x, y, z) = (a, b, c);
+LL + {
+LL + println!("{} {} {}", x, y, z);
+LL + }
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:34:5
+ |
+LL | / match (a, b, c) {
+LL | | (x, y, z) => println!("{} {} {}", x, y, z),
+LL | | }
+ | |_____^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let (x, y, z) = (a, b, c);
+LL + println!("{} {} {}", x, y, z);
+ |
+
+error: this match could be replaced by its body itself
+ --> $DIR/match_single_binding.rs:51:5
+ |
+LL | / match a {
+LL | | _ => println!("whatever"),
+LL | | }
+ | |_____^ help: consider using the match body instead: `println!("whatever");`
+
+error: this match could be replaced by its body itself
+ --> $DIR/match_single_binding.rs:55:5
+ |
+LL | / match a {
+LL | | _ => {
+LL | | let x = 29;
+LL | | println!("x has a value of {}", x);
+LL | | },
+LL | | }
+ | |_____^
+ |
+help: consider using the match body instead
+ |
+LL ~ {
+LL + let x = 29;
+LL + println!("x has a value of {}", x);
+LL + }
+ |
+
+error: this match could be replaced by its body itself
+ --> $DIR/match_single_binding.rs:62:5
+ |
+LL | / match a {
+LL | | _ => {
+LL | | let e = 5 * a;
+LL | | if e >= 5 {
+... |
+LL | | },
+LL | | }
+ | |_____^
+ |
+help: consider using the match body instead
+ |
+LL ~ {
+LL + let e = 5 * a;
+LL + if e >= 5 {
+LL + println!("e is superior to 5");
+LL + }
+LL + }
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:72:5
+ |
+LL | / match p {
+LL | | Point { x, y } => println!("Coords: ({}, {})", x, y),
+LL | | }
+ | |_____^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let Point { x, y } = p;
+LL + println!("Coords: ({}, {})", x, y);
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:76:5
+ |
+LL | / match p {
+LL | | Point { x: x1, y: y1 } => println!("Coords: ({}, {})", x1, y1),
+LL | | }
+ | |_____^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let Point { x: x1, y: y1 } = p;
+LL + println!("Coords: ({}, {})", x1, y1);
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:81:5
+ |
+LL | / match x {
+LL | | ref r => println!("Got a reference to {}", r),
+LL | | }
+ | |_____^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let ref r = x;
+LL + println!("Got a reference to {}", r);
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:86:5
+ |
+LL | / match x {
+LL | | ref mut mr => println!("Got a mutable reference to {}", mr),
+LL | | }
+ | |_____^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let ref mut mr = x;
+LL + println!("Got a mutable reference to {}", mr);
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:90:5
+ |
+LL | / let product = match coords() {
+LL | | Point { x, y } => x * y,
+LL | | };
+ | |______^
+ |
+help: consider using a `let` statement
+ |
+LL ~ let Point { x, y } = coords();
+LL + let product = x * y;
+ |
+
+error: this match could be written as a `let` statement
+ --> $DIR/match_single_binding.rs:98:18
+ |
+LL | .map(|i| match i.unwrap() {
+ | __________________^
+LL | | unwrapped => unwrapped,
+LL | | })
+ | |_________^
+ |
+help: consider using a `let` statement
+ |
+LL ~ .map(|i| {
+LL + let unwrapped = i.unwrap();
+LL + unwrapped
+LL ~ })
+ |
+
+error: this match could be replaced by its body itself
+ --> $DIR/match_single_binding.rs:124:5
+ |
+LL | / match x {
+LL | | // =>
+LL | | _ => println!("Not an array index start"),
+LL | | }
+ | |_____^ help: consider using the match body instead: `println!("Not an array index start");`
+
+error: this assignment could be simplified
+ --> $DIR/match_single_binding.rs:134:5
+ |
+LL | / val = match val.split_at(idx) {
+LL | | (pre, suf) => {
+LL | | println!("{}", pre);
+LL | | suf
+LL | | },
+LL | | };
+ | |_____^
+ |
+help: consider removing the `match` expression
+ |
+LL ~ let (pre, suf) = val.split_at(idx);
+LL + val = {
+LL + println!("{}", pre);
+LL + suf
+LL ~ };
+ |
+
++error: this match could be replaced by its scrutinee and body
++ --> $DIR/match_single_binding.rs:147:16
++ |
++LL | let _ = || match side_effects() {
++ | ________________^
++LL | | _ => println!("Needs curlies"),
++LL | | };
++ | |_____^
++ |
++help: consider using the scrutinee and body instead
++ |
++LL ~ let _ = || {
++LL + side_effects();
++LL + println!("Needs curlies");
++LL ~ };
++ |
++
++error: aborting due to 14 previous errors
+
--- /dev/null
- // revisions: edition2018 edition2021
- // [edition2018] edition:2018
- // [edition2021] edition:2021
+#![feature(exclusive_range_pattern)]
+#![allow(clippy::match_same_arms)]
+#![warn(clippy::match_wild_err_arm)]
+
+fn match_wild_err_arm() {
+ let x: Result<i32, &str> = Ok(3);
+
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => panic!("err"),
+ }
+
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => panic!(),
+ }
+
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => {
+ panic!();
+ },
+ }
+
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_e) => panic!(),
+ }
+
+ // Allowed when used in `panic!`.
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_e) => panic!("{}", _e),
+ }
+
+ // Allowed when not with `panic!` block.
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => println!("err"),
+ }
+
+ // Allowed when used with `unreachable!`.
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => unreachable!(),
+ }
+
+ // Allowed when used with `unreachable!`.
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => {
+ unreachable!();
+ },
+ }
+}
+
+fn main() {}
--- /dev/null
--- /dev/null
++error: `Err(_)` matches all errors
++ --> $DIR/match_wild_err_arm.rs:11:9
++ |
++LL | Err(_) => panic!("err"),
++ | ^^^^^^
++ |
++ = note: match each error separately or use the error output, or use `.expect(msg)` if the error case is unreachable
++ = note: `-D clippy::match-wild-err-arm` implied by `-D warnings`
++
++error: `Err(_)` matches all errors
++ --> $DIR/match_wild_err_arm.rs:17:9
++ |
++LL | Err(_) => panic!(),
++ | ^^^^^^
++ |
++ = note: match each error separately or use the error output, or use `.expect(msg)` if the error case is unreachable
++
++error: `Err(_)` matches all errors
++ --> $DIR/match_wild_err_arm.rs:23:9
++ |
++LL | Err(_) => {
++ | ^^^^^^
++ |
++ = note: match each error separately or use the error output, or use `.expect(msg)` if the error case is unreachable
++
++error: `Err(_e)` matches all errors
++ --> $DIR/match_wild_err_arm.rs:31:9
++ |
++LL | Err(_e) => panic!(),
++ | ^^^^^^^
++ |
++ = note: match each error separately or use the error output, or use `.expect(msg)` if the error case is unreachable
++
++error: aborting due to 4 previous errors
++
--- /dev/null
- #![allow(unused_imports)]
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
++#![allow(unused)]
+#![warn(
+ clippy::all,
+ clippy::style,
+ clippy::mem_replace_option_with_none,
+ clippy::mem_replace_with_default
+)]
+
+use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, LinkedList, VecDeque};
+use std::mem;
+
+fn replace_option_with_none() {
+ let mut an_option = Some(1);
+ let _ = an_option.take();
+ let an_option = &mut Some(1);
+ let _ = an_option.take();
+}
+
+fn replace_with_default() {
+ let mut s = String::from("foo");
+ let _ = std::mem::take(&mut s);
+
+ let s = &mut String::from("foo");
+ let _ = std::mem::take(s);
+ let _ = std::mem::take(s);
+
+ let mut v = vec![123];
+ let _ = std::mem::take(&mut v);
+ let _ = std::mem::take(&mut v);
+ let _ = std::mem::take(&mut v);
+ let _ = std::mem::take(&mut v);
+
+ let mut hash_map: HashMap<i32, i32> = HashMap::new();
+ let _ = std::mem::take(&mut hash_map);
+
+ let mut btree_map: BTreeMap<i32, i32> = BTreeMap::new();
+ let _ = std::mem::take(&mut btree_map);
+
+ let mut vd: VecDeque<i32> = VecDeque::new();
+ let _ = std::mem::take(&mut vd);
+
+ let mut hash_set: HashSet<&str> = HashSet::new();
+ let _ = std::mem::take(&mut hash_set);
+
+ let mut btree_set: BTreeSet<&str> = BTreeSet::new();
+ let _ = std::mem::take(&mut btree_set);
+
+ let mut list: LinkedList<i32> = LinkedList::new();
+ let _ = std::mem::take(&mut list);
+
+ let mut binary_heap: BinaryHeap<i32> = BinaryHeap::new();
+ let _ = std::mem::take(&mut binary_heap);
+
+ let mut tuple = (vec![1, 2], BinaryHeap::<i32>::new());
+ let _ = std::mem::take(&mut tuple);
+
+ let mut refstr = "hello";
+ let _ = std::mem::take(&mut refstr);
+
+ let mut slice: &[i32] = &[1, 2, 3];
+ let _ = std::mem::take(&mut slice);
+}
+
+// lint is disabled for primitives because in this case `take`
+// has no clear benefit over `replace` and sometimes is harder to read
+fn dont_lint_primitive() {
+ let mut pbool = true;
+ let _ = std::mem::replace(&mut pbool, false);
+
+ let mut pint = 5;
+ let _ = std::mem::replace(&mut pint, 0);
+}
+
+fn main() {
+ replace_option_with_none();
+ replace_with_default();
+ dont_lint_primitive();
+}
++
++fn msrv_1_39() {
++ #![clippy::msrv = "1.39"]
++
++ let mut s = String::from("foo");
++ let _ = std::mem::replace(&mut s, String::default());
++}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ let mut s = String::from("foo");
++ let _ = std::mem::take(&mut s);
++}
--- /dev/null
- #![allow(unused_imports)]
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
++#![allow(unused)]
+#![warn(
+ clippy::all,
+ clippy::style,
+ clippy::mem_replace_option_with_none,
+ clippy::mem_replace_with_default
+)]
+
+use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, LinkedList, VecDeque};
+use std::mem;
+
+fn replace_option_with_none() {
+ let mut an_option = Some(1);
+ let _ = mem::replace(&mut an_option, None);
+ let an_option = &mut Some(1);
+ let _ = mem::replace(an_option, None);
+}
+
+fn replace_with_default() {
+ let mut s = String::from("foo");
+ let _ = std::mem::replace(&mut s, String::default());
+
+ let s = &mut String::from("foo");
+ let _ = std::mem::replace(s, String::default());
+ let _ = std::mem::replace(s, Default::default());
+
+ let mut v = vec![123];
+ let _ = std::mem::replace(&mut v, Vec::default());
+ let _ = std::mem::replace(&mut v, Default::default());
+ let _ = std::mem::replace(&mut v, Vec::new());
+ let _ = std::mem::replace(&mut v, vec![]);
+
+ let mut hash_map: HashMap<i32, i32> = HashMap::new();
+ let _ = std::mem::replace(&mut hash_map, HashMap::new());
+
+ let mut btree_map: BTreeMap<i32, i32> = BTreeMap::new();
+ let _ = std::mem::replace(&mut btree_map, BTreeMap::new());
+
+ let mut vd: VecDeque<i32> = VecDeque::new();
+ let _ = std::mem::replace(&mut vd, VecDeque::new());
+
+ let mut hash_set: HashSet<&str> = HashSet::new();
+ let _ = std::mem::replace(&mut hash_set, HashSet::new());
+
+ let mut btree_set: BTreeSet<&str> = BTreeSet::new();
+ let _ = std::mem::replace(&mut btree_set, BTreeSet::new());
+
+ let mut list: LinkedList<i32> = LinkedList::new();
+ let _ = std::mem::replace(&mut list, LinkedList::new());
+
+ let mut binary_heap: BinaryHeap<i32> = BinaryHeap::new();
+ let _ = std::mem::replace(&mut binary_heap, BinaryHeap::new());
+
+ let mut tuple = (vec![1, 2], BinaryHeap::<i32>::new());
+ let _ = std::mem::replace(&mut tuple, (vec![], BinaryHeap::new()));
+
+ let mut refstr = "hello";
+ let _ = std::mem::replace(&mut refstr, "");
+
+ let mut slice: &[i32] = &[1, 2, 3];
+ let _ = std::mem::replace(&mut slice, &[]);
+}
+
+// lint is disabled for primitives because in this case `take`
+// has no clear benefit over `replace` and sometimes is harder to read
+fn dont_lint_primitive() {
+ let mut pbool = true;
+ let _ = std::mem::replace(&mut pbool, false);
+
+ let mut pint = 5;
+ let _ = std::mem::replace(&mut pint, 0);
+}
+
+fn main() {
+ replace_option_with_none();
+ replace_with_default();
+ dont_lint_primitive();
+}
++
++fn msrv_1_39() {
++ #![clippy::msrv = "1.39"]
++
++ let mut s = String::from("foo");
++ let _ = std::mem::replace(&mut s, String::default());
++}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ let mut s = String::from("foo");
++ let _ = std::mem::replace(&mut s, String::default());
++}
--- /dev/null
- --> $DIR/mem_replace.rs:15:13
+error: replacing an `Option` with `None`
- --> $DIR/mem_replace.rs:17:13
++ --> $DIR/mem_replace.rs:17:13
+ |
+LL | let _ = mem::replace(&mut an_option, None);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider `Option::take()` instead: `an_option.take()`
+ |
+ = note: `-D clippy::mem-replace-option-with-none` implied by `-D warnings`
+
+error: replacing an `Option` with `None`
- --> $DIR/mem_replace.rs:22:13
++ --> $DIR/mem_replace.rs:19:13
+ |
+LL | let _ = mem::replace(an_option, None);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider `Option::take()` instead: `an_option.take()`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:25:13
++ --> $DIR/mem_replace.rs:24:13
+ |
+LL | let _ = std::mem::replace(&mut s, String::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut s)`
+ |
+ = note: `-D clippy::mem-replace-with-default` implied by `-D warnings`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:26:13
++ --> $DIR/mem_replace.rs:27:13
+ |
+LL | let _ = std::mem::replace(s, String::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(s)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:29:13
++ --> $DIR/mem_replace.rs:28:13
+ |
+LL | let _ = std::mem::replace(s, Default::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(s)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:30:13
++ --> $DIR/mem_replace.rs:31:13
+ |
+LL | let _ = std::mem::replace(&mut v, Vec::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut v)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:31:13
++ --> $DIR/mem_replace.rs:32:13
+ |
+LL | let _ = std::mem::replace(&mut v, Default::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut v)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:32:13
++ --> $DIR/mem_replace.rs:33:13
+ |
+LL | let _ = std::mem::replace(&mut v, Vec::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut v)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:35:13
++ --> $DIR/mem_replace.rs:34:13
+ |
+LL | let _ = std::mem::replace(&mut v, vec![]);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut v)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:38:13
++ --> $DIR/mem_replace.rs:37:13
+ |
+LL | let _ = std::mem::replace(&mut hash_map, HashMap::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut hash_map)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:41:13
++ --> $DIR/mem_replace.rs:40:13
+ |
+LL | let _ = std::mem::replace(&mut btree_map, BTreeMap::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut btree_map)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:44:13
++ --> $DIR/mem_replace.rs:43:13
+ |
+LL | let _ = std::mem::replace(&mut vd, VecDeque::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut vd)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:47:13
++ --> $DIR/mem_replace.rs:46:13
+ |
+LL | let _ = std::mem::replace(&mut hash_set, HashSet::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut hash_set)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:50:13
++ --> $DIR/mem_replace.rs:49:13
+ |
+LL | let _ = std::mem::replace(&mut btree_set, BTreeSet::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut btree_set)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:53:13
++ --> $DIR/mem_replace.rs:52:13
+ |
+LL | let _ = std::mem::replace(&mut list, LinkedList::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut list)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:56:13
++ --> $DIR/mem_replace.rs:55:13
+ |
+LL | let _ = std::mem::replace(&mut binary_heap, BinaryHeap::new());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut binary_heap)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:59:13
++ --> $DIR/mem_replace.rs:58:13
+ |
+LL | let _ = std::mem::replace(&mut tuple, (vec![], BinaryHeap::new()));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut tuple)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- --> $DIR/mem_replace.rs:62:13
++ --> $DIR/mem_replace.rs:61:13
+ |
+LL | let _ = std::mem::replace(&mut refstr, "");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut refstr)`
+
+error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
- error: aborting due to 19 previous errors
++ --> $DIR/mem_replace.rs:64:13
+ |
+LL | let _ = std::mem::replace(&mut slice, &[]);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut slice)`
+
++error: replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`
++ --> $DIR/mem_replace.rs:94:13
++ |
++LL | let _ = std::mem::replace(&mut s, String::default());
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `std::mem::take(&mut s)`
++
++error: aborting due to 20 previous errors
+
--- /dev/null
- #![clippy::msrv = "1.0.0"]
+#![allow(clippy::redundant_clone)]
+#![feature(custom_inner_attributes)]
- use std::ops::{Deref, RangeFrom};
+
- fn approx_const() {
++fn main() {}
+
- let log10_2 = 0.301029995663981;
++fn just_under_msrv() {
++ #![clippy::msrv = "1.42.0"]
+ let log2_10 = 3.321928094887362;
- fn cloned_instead_of_copied() {
- let _ = [1].iter().cloned();
- }
-
- fn option_as_ref_deref() {
- let mut opt = Some(String::from("123"));
-
- let _ = opt.as_ref().map(String::as_str);
- let _ = opt.as_ref().map(|x| x.as_str());
- let _ = opt.as_mut().map(String::as_mut_str);
- let _ = opt.as_mut().map(|x| x.as_mut_str());
- }
-
- fn match_like_matches() {
- let _y = match Some(5) {
- Some(0) => true,
- _ => false,
- };
- }
-
- fn match_same_arms() {
- match (1, 2, 3) {
- (1, .., 3) => 42,
- (.., 3) => 42, //~ ERROR match arms have same body
- _ => 0,
- };
- }
-
- fn match_same_arms2() {
- let _ = match Some(42) {
- Some(_) => 24,
- None => 24, //~ ERROR match arms have same body
- };
- }
-
- pub fn manual_strip_msrv() {
- let s = "hello, world!";
- if s.starts_with("hello, ") {
- assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- }
- }
-
- pub fn redundant_fieldnames() {
- let start = 0;
- let _ = RangeFrom { start: start };
- }
-
- pub fn redundant_static_lifetime() {
- const VAR_ONE: &'static str = "Test constant #1";
- }
-
- pub fn checked_conversion() {
- let value: i64 = 42;
- let _ = value <= (u32::max_value() as i64) && value >= 0;
- let _ = value <= (u32::MAX as i64) && value >= 0;
- }
-
- pub struct FromOverInto(String);
-
- impl Into<FromOverInto> for String {
- fn into(self) -> FromOverInto {
- FromOverInto(self)
- }
- }
-
- pub fn filter_map_next() {
- let a = ["1", "lol", "3", "NaN", "5"];
-
- #[rustfmt::skip]
- let _: Option<u32> = vec![1, 2, 3, 4, 5, 6]
- .into_iter()
- .filter_map(|x| {
- if x == 2 {
- Some(x * 2)
- } else {
- None
- }
- })
- .next();
- }
-
- #[allow(clippy::no_effect)]
- #[allow(clippy::short_circuit_statement)]
- #[allow(clippy::unnecessary_operation)]
- pub fn manual_range_contains() {
- let x = 5;
- x >= 8 && x < 12;
- }
-
- pub fn use_self() {
- struct Foo;
-
- impl Foo {
- fn new() -> Foo {
- Foo {}
- }
- fn test() -> Foo {
- Foo::new()
- }
- }
- }
-
- fn replace_with_default() {
- let mut s = String::from("foo");
- let _ = std::mem::replace(&mut s, String::default());
- }
-
- fn map_unwrap_or() {
- let opt = Some(1);
-
- // Check for `option.map(_).unwrap_or(_)` use.
- // Single line case.
- let _ = opt
- .map(|x| x + 1)
- // Should lint even though this call is on a separate line.
- .unwrap_or(0);
- }
-
- // Could be const
- fn missing_const_for_fn() -> i32 {
- 1
- }
-
- fn unnest_or_patterns() {
- struct TS(u8, u8);
- if let TS(0, x) | TS(1, x) = TS(0, 0) {}
- }
-
- #[cfg_attr(rustfmt, rustfmt_skip)]
- fn deprecated_cfg_attr() {}
-
- #[warn(clippy::cast_lossless)]
- fn int_from_bool() -> u8 {
- true as u8
- }
-
- fn err_expect() {
- let x: Result<u32, &str> = Ok(10);
- x.err().expect("Testing expect_err");
- }
-
- fn cast_abs_to_unsigned() {
- let x: i32 = 10;
- assert_eq!(10u32, x.abs() as u32);
- }
-
- fn manual_rem_euclid() {
- let x: i32 = 10;
- let _: i32 = ((x % 4) + 4) % 4;
- }
-
- fn manual_clamp() {
- let (input, min, max) = (0, -1, 2);
- let _ = if input < min {
- min
- } else if input > max {
- max
- } else {
- input
- };
- }
-
- fn main() {
- filter_map_next();
- checked_conversion();
- redundant_fieldnames();
- redundant_static_lifetime();
- option_as_ref_deref();
- match_like_matches();
- match_same_arms();
- match_same_arms2();
- manual_strip_msrv();
- manual_range_contains();
- use_self();
- replace_with_default();
- map_unwrap_or();
- missing_const_for_fn();
- unnest_or_patterns();
- int_from_bool();
- err_expect();
- cast_abs_to_unsigned();
- manual_rem_euclid();
- manual_clamp();
+}
+
- mod just_under_msrv {
- #![feature(custom_inner_attributes)]
++fn meets_msrv() {
++ #![clippy::msrv = "1.43.0"]
++ let log2_10 = 3.321928094887362;
+}
+
-
- fn main() {
- let s = "hello, world!";
- if s.starts_with("hello, ") {
- assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- }
- }
- }
-
- mod meets_msrv {
- #![feature(custom_inner_attributes)]
- #![clippy::msrv = "1.45.0"]
-
- fn main() {
- let s = "hello, world!";
- if s.starts_with("hello, ") {
- assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- }
- }
++fn just_above_msrv() {
+ #![clippy::msrv = "1.44.0"]
- mod just_above_msrv {
- #![feature(custom_inner_attributes)]
- #![clippy::msrv = "1.46.0"]
-
- fn main() {
- let s = "hello, world!";
- if s.starts_with("hello, ") {
- assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- }
- }
++ let log2_10 = 3.321928094887362;
+}
+
- mod const_rem_euclid {
- #![feature(custom_inner_attributes)]
- #![clippy::msrv = "1.50.0"]
-
- pub const fn const_rem_euclid_4(num: i32) -> i32 {
- ((num % 4) + 4) % 4
- }
++fn no_patch_under() {
++ #![clippy::msrv = "1.42"]
++ let log2_10 = 3.321928094887362;
+}
+
++fn no_patch_meets() {
++ #![clippy::msrv = "1.43"]
++ let log2_10 = 3.321928094887362;
+}
--- /dev/null
- error: stripping a prefix manually
- --> $DIR/min_rust_version_attr.rs:216:24
++error: approximate value of `f{32, 64}::consts::LOG2_10` found
++ --> $DIR/min_rust_version_attr.rs:13:19
+ |
- LL | assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- | ^^^^^^^^^^^^^^^^^^^^
- |
- note: the prefix was tested here
- --> $DIR/min_rust_version_attr.rs:215:9
- |
- LL | if s.starts_with("hello, ") {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- = note: `-D clippy::manual-strip` implied by `-D warnings`
- help: try using the `strip_prefix` method
- |
- LL ~ if let Some(<stripped>) = s.strip_prefix("hello, ") {
- LL ~ assert_eq!(<stripped>.to_uppercase(), "WORLD!");
++LL | let log2_10 = 3.321928094887362;
++ | ^^^^^^^^^^^^^^^^^
+ |
++ = help: consider using the constant directly
++ = note: `#[deny(clippy::approx_constant)]` on by default
+
- error: stripping a prefix manually
- --> $DIR/min_rust_version_attr.rs:228:24
++error: approximate value of `f{32, 64}::consts::LOG2_10` found
++ --> $DIR/min_rust_version_attr.rs:18:19
+ |
- LL | assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
- | ^^^^^^^^^^^^^^^^^^^^
++LL | let log2_10 = 3.321928094887362;
++ | ^^^^^^^^^^^^^^^^^
+ |
- note: the prefix was tested here
- --> $DIR/min_rust_version_attr.rs:227:9
- |
- LL | if s.starts_with("hello, ") {
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- help: try using the `strip_prefix` method
++ = help: consider using the constant directly
++
++error: approximate value of `f{32, 64}::consts::LOG2_10` found
++ --> $DIR/min_rust_version_attr.rs:28:19
+ |
- LL ~ if let Some(<stripped>) = s.strip_prefix("hello, ") {
- LL ~ assert_eq!(<stripped>.to_uppercase(), "WORLD!");
++LL | let log2_10 = 3.321928094887362;
++ | ^^^^^^^^^^^^^^^^^
+ |
++ = help: consider using the constant directly
+
- error: aborting due to 2 previous errors
++error: aborting due to 3 previous errors
+
--- /dev/null
+#![feature(custom_inner_attributes)]
+#![clippy::msrv = "invalid.version"]
+
+fn main() {}
++
++#[clippy::msrv = "invalid.version"]
++fn outer_attr() {}
++
++mod multiple {
++ #![clippy::msrv = "1.40"]
++ #![clippy::msrv = "=1.35.0"]
++ #![clippy::msrv = "1.10.1"]
++
++ mod foo {
++ #![clippy::msrv = "1"]
++ #![clippy::msrv = "1.0.0"]
++ }
++}
--- /dev/null
- error: aborting due to previous error
+error: `invalid.version` is not a valid Rust version
+ --> $DIR/min_rust_version_invalid_attr.rs:2:1
+ |
+LL | #![clippy::msrv = "invalid.version"]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
++error: `msrv` cannot be an outer attribute
++ --> $DIR/min_rust_version_invalid_attr.rs:6:1
++ |
++LL | #[clippy::msrv = "invalid.version"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: `msrv` is defined multiple times
++ --> $DIR/min_rust_version_invalid_attr.rs:11:5
++ |
++LL | #![clippy::msrv = "=1.35.0"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++note: first definition found here
++ --> $DIR/min_rust_version_invalid_attr.rs:10:5
++ |
++LL | #![clippy::msrv = "1.40"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: `msrv` is defined multiple times
++ --> $DIR/min_rust_version_invalid_attr.rs:12:5
++ |
++LL | #![clippy::msrv = "1.10.1"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++note: first definition found here
++ --> $DIR/min_rust_version_invalid_attr.rs:10:5
++ |
++LL | #![clippy::msrv = "1.40"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: `msrv` is defined multiple times
++ --> $DIR/min_rust_version_invalid_attr.rs:16:9
++ |
++LL | #![clippy::msrv = "1.0.0"]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++note: first definition found here
++ --> $DIR/min_rust_version_invalid_attr.rs:15:9
++ |
++LL | #![clippy::msrv = "1"]
++ | ^^^^^^^^^^^^^^^^^^^^^^
++
++error: aborting due to 5 previous errors
+
--- /dev/null
+#![warn(clippy::missing_const_for_fn)]
+#![allow(incomplete_features, clippy::let_and_return)]
+#![feature(custom_inner_attributes)]
+
+use std::mem::transmute;
+
+struct Game {
+ guess: i32,
+}
+
+impl Game {
+ // Could be const
+ pub fn new() -> Self {
+ Self { guess: 42 }
+ }
+
+ fn const_generic_params<'a, T, const N: usize>(&self, b: &'a [T; N]) -> &'a [T; N] {
+ b
+ }
+}
+
+// Could be const
+fn one() -> i32 {
+ 1
+}
+
+// Could also be const
+fn two() -> i32 {
+ let abc = 2;
+ abc
+}
+
+// Could be const (since Rust 1.39)
+fn string() -> String {
+ String::new()
+}
+
+// Could be const
+unsafe fn four() -> i32 {
+ 4
+}
+
+// Could also be const
+fn generic<T>(t: T) -> T {
+ t
+}
+
+fn sub(x: u32) -> usize {
+ unsafe { transmute(&x) }
+}
+
+fn generic_arr<T: Copy>(t: [T; 1]) -> T {
+ t[0]
+}
+
+mod with_drop {
+ pub struct A;
+ pub struct B;
+ impl Drop for A {
+ fn drop(&mut self) {}
+ }
+
+ impl B {
+ // This can be const, because `a` is passed by reference
+ pub fn b(self, a: &A) -> B {
+ B
+ }
+ }
+}
+
+mod const_fn_stabilized_before_msrv {
+ #![clippy::msrv = "1.47.0"]
+
+ // This could be const because `u8::is_ascii_digit` is a stable const function in 1.47.
+ fn const_fn_stabilized_before_msrv(byte: u8) {
+ byte.is_ascii_digit();
+ }
+}
+
++fn msrv_1_45() -> i32 {
++ #![clippy::msrv = "1.45"]
++
++ 45
++}
++
++fn msrv_1_46() -> i32 {
++ #![clippy::msrv = "1.46"]
++
++ 46
++}
++
+// Should not be const
+fn main() {}
--- /dev/null
- error: aborting due to 10 previous errors
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:13:5
+ |
+LL | / pub fn new() -> Self {
+LL | | Self { guess: 42 }
+LL | | }
+ | |_____^
+ |
+ = note: `-D clippy::missing-const-for-fn` implied by `-D warnings`
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:17:5
+ |
+LL | / fn const_generic_params<'a, T, const N: usize>(&self, b: &'a [T; N]) -> &'a [T; N] {
+LL | | b
+LL | | }
+ | |_____^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:23:1
+ |
+LL | / fn one() -> i32 {
+LL | | 1
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:28:1
+ |
+LL | / fn two() -> i32 {
+LL | | let abc = 2;
+LL | | abc
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:34:1
+ |
+LL | / fn string() -> String {
+LL | | String::new()
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:39:1
+ |
+LL | / unsafe fn four() -> i32 {
+LL | | 4
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:44:1
+ |
+LL | / fn generic<T>(t: T) -> T {
+LL | | t
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:52:1
+ |
+LL | / fn generic_arr<T: Copy>(t: [T; 1]) -> T {
+LL | | t[0]
+LL | | }
+ | |_^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:65:9
+ |
+LL | / pub fn b(self, a: &A) -> B {
+LL | | B
+LL | | }
+ | |_________^
+
+error: this could be a `const fn`
+ --> $DIR/could_be_const.rs:75:5
+ |
+LL | / fn const_fn_stabilized_before_msrv(byte: u8) {
+LL | | byte.is_ascii_digit();
+LL | | }
+ | |_____^
+
++error: this could be a `const fn`
++ --> $DIR/could_be_const.rs:86:1
++ |
++LL | / fn msrv_1_46() -> i32 {
++LL | | #![clippy::msrv = "1.46"]
++LL | |
++LL | | 46
++LL | | }
++ | |_^
++
++error: aborting due to 11 previous errors
+
--- /dev/null
--- /dev/null
++#![allow(unused, clippy::needless_lifetimes)]
++#![warn(clippy::missing_trait_methods)]
++
++trait A {
++ fn provided() {}
++}
++
++trait B {
++ fn required();
++
++ fn a(_: usize) -> usize {
++ 1
++ }
++
++ fn b<'a, T: AsRef<[u8]>>(a: &'a T) -> &'a [u8] {
++ a.as_ref()
++ }
++}
++
++struct Partial;
++
++impl A for Partial {}
++
++impl B for Partial {
++ fn required() {}
++
++ fn a(_: usize) -> usize {
++ 2
++ }
++}
++
++struct Complete;
++
++impl A for Complete {
++ fn provided() {}
++}
++
++impl B for Complete {
++ fn required() {}
++
++ fn a(_: usize) -> usize {
++ 2
++ }
++
++ fn b<T: AsRef<[u8]>>(a: &T) -> &[u8] {
++ a.as_ref()
++ }
++}
++
++fn main() {}
--- /dev/null
--- /dev/null
++error: missing trait method provided by default: `provided`
++ --> $DIR/missing_trait_methods.rs:22:1
++ |
++LL | impl A for Partial {}
++ | ^^^^^^^^^^^^^^^^^^
++ |
++help: implement the method
++ --> $DIR/missing_trait_methods.rs:5:5
++ |
++LL | fn provided() {}
++ | ^^^^^^^^^^^^^
++ = note: `-D clippy::missing-trait-methods` implied by `-D warnings`
++
++error: missing trait method provided by default: `b`
++ --> $DIR/missing_trait_methods.rs:24:1
++ |
++LL | impl B for Partial {
++ | ^^^^^^^^^^^^^^^^^^
++ |
++help: implement the method
++ --> $DIR/missing_trait_methods.rs:15:5
++ |
++LL | fn b<'a, T: AsRef<[u8]>>(a: &'a T) -> &'a [u8] {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: aborting due to 2 previous errors
++
--- /dev/null
- #[allow(clippy::uninlined_format_args, clippy::unnecessary_mut_passed)]
+// run-rustfix
+#![feature(custom_inner_attributes, lint_reasons)]
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables)]
- takes_iter(&mut x)
++#[allow(
++ clippy::uninlined_format_args,
++ clippy::unnecessary_mut_passed,
++ clippy::unnecessary_to_owned
++)]
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &a
+ },
+ 46 => &a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&a);
+ let _ = x(&a);
+ let _ = x(&mut b);
+ let _ = x(ref_a);
+ {
+ let b = &mut b;
+ x(b);
+ }
+
+ // Issue #8191
+ let mut x = 5;
+ let mut x = &mut x;
+
+ mut_ref(x);
+ mut_ref(x);
+ let y: &mut i32 = x;
+ let y: &mut i32 = x;
+
+ let y = match 0 {
+ // Don't lint. Removing the borrow would move 'x'
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ let y: &mut i32 = match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => x,
+ _ => &mut *x,
+ };
+ fn ref_mut_i32(_: &mut i32) {}
+ ref_mut_i32(match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => x,
+ _ => &mut *x,
+ });
+ // use 'x' after to make sure it's still usable in the fixed code.
+ *x = 5;
+
+ let s = String::new();
+ // let _ = (&s).len();
+ // let _ = (&s).capacity();
+ // let _ = (&&s).capacity();
+
+ let x = (1, 2);
+ let _ = x.0;
+ let x = &x as *const (i32, i32);
+ let _ = unsafe { (*x).0 };
+
+ // Issue #8367
+ trait Foo {
+ fn foo(self);
+ }
+ impl Foo for &'_ () {
+ fn foo(self) {}
+ }
+ (&()).foo(); // Don't lint. `()` doesn't implement `Foo`
+ (&()).foo();
+
+ impl Foo for i32 {
+ fn foo(self) {}
+ }
+ impl Foo for &'_ i32 {
+ fn foo(self) {}
+ }
+ (&5).foo(); // Don't lint. `5` will call `<i32 as Foo>::foo`
+ (&5).foo();
+
+ trait FooRef {
+ fn foo_ref(&self);
+ }
+ impl FooRef for () {
+ fn foo_ref(&self) {}
+ }
+ impl FooRef for &'_ () {
+ fn foo_ref(&self) {}
+ }
+ (&&()).foo_ref(); // Don't lint. `&()` will call `<() as FooRef>::foo_ref`
+
+ struct S;
+ impl From<S> for u32 {
+ fn from(s: S) -> Self {
+ (&s).into()
+ }
+ }
+ impl From<&S> for u32 {
+ fn from(s: &S) -> Self {
+ 0
+ }
+ }
+
+ let _ = std::process::Command::new("ls").args(["-a", "-l"]).status().unwrap();
+ let _ = std::path::Path::new(".").join(".");
+ deref_target_is_x(X);
+ multiple_constraints([[""]]);
+ multiple_constraints_normalizes_to_same(X, X);
+ let _ = Some("").unwrap_or("");
++ let _ = std::fs::write("x", "".to_string());
+
+ only_sized(&""); // Don't lint. `Sized` is only bound
+ let _ = std::any::Any::type_id(&""); // Don't lint. `Any` is only bound
+ let _ = Box::new(&""); // Don't lint. Type parameter appears in return type
+ ref_as_ref_path(&""); // Don't lint. Argument type is not a type parameter
+ refs_only(&()); // Don't lint. `&T` implements trait, but `T` doesn't
+ multiple_constraints_normalizes_to_different(&[[""]], &[""]); // Don't lint. Projected type appears in arguments
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+#[allow(dead_code)]
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
+
+#[allow(dead_code)]
+mod issue9160 {
+ pub struct S<F> {
+ f: F,
+ }
+
+ impl<T, F> S<F>
+ where
+ F: Fn() -> T,
+ {
+ fn calls_field(&self) -> T {
+ (self.f)()
+ }
+ }
+
+ impl<T, F> S<F>
+ where
+ F: FnMut() -> T,
+ {
+ fn calls_mut_field(&mut self) -> T {
+ (self.f)()
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+struct X;
+
+impl std::ops::Deref for X {
+ type Target = X;
+ fn deref(&self) -> &Self::Target {
+ self
+ }
+}
+
+fn deref_target_is_x<T>(_: T)
+where
+ T: std::ops::Deref<Target = X>,
+{
+}
+
+fn multiple_constraints<T, U, V, X, Y>(_: T)
+where
+ T: IntoIterator<Item = U> + IntoIterator<Item = X>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+ X: IntoIterator<Item = Y>,
+ Y: AsRef<std::ffi::OsStr>,
+{
+}
+
+fn multiple_constraints_normalizes_to_same<T, U, V>(_: T, _: V)
+where
+ T: std::ops::Deref<Target = U>,
+ U: std::ops::Deref<Target = V>,
+{
+}
+
+fn only_sized<T>(_: T) {}
+
+fn ref_as_ref_path<T: 'static>(_: &'static T)
+where
+ &'static T: AsRef<std::path::Path>,
+{
+}
+
+trait RefsOnly {
+ type Referent;
+}
+
+impl<T> RefsOnly for &T {
+ type Referent = T;
+}
+
+fn refs_only<T, U>(_: T)
+where
+ T: RefsOnly<Referent = U>,
+{
+}
+
+fn multiple_constraints_normalizes_to_different<T, U, V>(_: T, _: U)
+where
+ T: IntoIterator<Item = U>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+{
+}
+
+// https://github.com/rust-lang/rust-clippy/pull/9136#pullrequestreview-1037379321
+#[allow(dead_code)]
+mod copyable_iterator {
+ #[derive(Clone, Copy)]
+ struct Iter;
+ impl Iterator for Iter {
+ type Item = ();
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
+ }
+ fn takes_iter(_: impl Iterator) {}
+ fn dont_warn(mut x: Iter) {
+ takes_iter(&mut x);
+ }
++ #[allow(unused_mut)]
+ fn warn(mut x: &mut Iter) {
++ takes_iter(x)
+ }
+}
+
+mod under_msrv {
+ #![allow(dead_code)]
+ #![clippy::msrv = "1.52.0"]
+
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+mod meets_msrv {
+ #![allow(dead_code)]
+ #![clippy::msrv = "1.53.0"]
+
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(["-a", "-l"]).status().unwrap();
+ }
+}
+
+#[allow(unused)]
+fn issue9383() {
+ // Should not lint because unions need explicit deref when accessing field
+ use std::mem::ManuallyDrop;
+
+ union Coral {
+ crab: ManuallyDrop<Vec<i32>>,
+ }
+
+ union Ocean {
+ coral: ManuallyDrop<Coral>,
+ }
+
+ let mut ocean = Ocean {
+ coral: ManuallyDrop::new(Coral {
+ crab: ManuallyDrop::new(vec![1, 2, 3]),
+ }),
+ };
+
+ unsafe {
+ ManuallyDrop::drop(&mut (&mut ocean.coral).crab);
+
+ (*ocean.coral).crab = ManuallyDrop::new(vec![4, 5, 6]);
+ ManuallyDrop::drop(&mut (*ocean.coral).crab);
+
+ ManuallyDrop::drop(&mut ocean.coral);
+ }
+}
++
++#[allow(dead_code)]
++fn closure_test() {
++ let env = "env".to_owned();
++ let arg = "arg".to_owned();
++ let f = |arg| {
++ let loc = "loc".to_owned();
++ let _ = std::fs::write("x", &env); // Don't lint. In environment
++ let _ = std::fs::write("x", arg);
++ let _ = std::fs::write("x", loc);
++ };
++ let _ = std::fs::write("x", &env); // Don't lint. Borrowed by `f`
++ f(arg);
++}
++
++#[allow(dead_code)]
++mod significant_drop {
++ #[derive(Debug)]
++ struct X;
++
++ #[derive(Debug)]
++ struct Y;
++
++ impl Drop for Y {
++ fn drop(&mut self) {}
++ }
++
++ fn foo(x: X, y: Y) {
++ debug(x);
++ debug(&y); // Don't lint. Has significant drop
++ }
++
++ fn debug(_: impl std::fmt::Debug) {}
++}
++
++#[allow(dead_code)]
++mod used_exactly_once {
++ fn foo(x: String) {
++ use_x(x);
++ }
++ fn use_x(_: impl AsRef<str>) {}
++}
++
++#[allow(dead_code)]
++mod used_more_than_once {
++ fn foo(x: String) {
++ use_x(&x);
++ use_x_again(&x);
++ }
++ fn use_x(_: impl AsRef<str>) {}
++ fn use_x_again(_: impl AsRef<str>) {}
++}
--- /dev/null
- #[allow(clippy::uninlined_format_args, clippy::unnecessary_mut_passed)]
+// run-rustfix
+#![feature(custom_inner_attributes, lint_reasons)]
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables)]
++#[allow(
++ clippy::uninlined_format_args,
++ clippy::unnecessary_mut_passed,
++ clippy::unnecessary_to_owned
++)]
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut &mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &&a
+ },
+ 46 => &&a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break &ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&&&a);
+ let _ = x(&mut &&a);
+ let _ = x(&&&mut b);
+ let _ = x(&&ref_a);
+ {
+ let b = &mut b;
+ x(&b);
+ }
+
+ // Issue #8191
+ let mut x = 5;
+ let mut x = &mut x;
+
+ mut_ref(&mut x);
+ mut_ref(&mut &mut x);
+ let y: &mut i32 = &mut x;
+ let y: &mut i32 = &mut &mut x;
+
+ let y = match 0 {
+ // Don't lint. Removing the borrow would move 'x'
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ let y: &mut i32 = match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ fn ref_mut_i32(_: &mut i32) {}
+ ref_mut_i32(match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => &mut x,
+ _ => &mut *x,
+ });
+ // use 'x' after to make sure it's still usable in the fixed code.
+ *x = 5;
+
+ let s = String::new();
+ // let _ = (&s).len();
+ // let _ = (&s).capacity();
+ // let _ = (&&s).capacity();
+
+ let x = (1, 2);
+ let _ = (&x).0;
+ let x = &x as *const (i32, i32);
+ let _ = unsafe { (&*x).0 };
+
+ // Issue #8367
+ trait Foo {
+ fn foo(self);
+ }
+ impl Foo for &'_ () {
+ fn foo(self) {}
+ }
+ (&()).foo(); // Don't lint. `()` doesn't implement `Foo`
+ (&&()).foo();
+
+ impl Foo for i32 {
+ fn foo(self) {}
+ }
+ impl Foo for &'_ i32 {
+ fn foo(self) {}
+ }
+ (&5).foo(); // Don't lint. `5` will call `<i32 as Foo>::foo`
+ (&&5).foo();
+
+ trait FooRef {
+ fn foo_ref(&self);
+ }
+ impl FooRef for () {
+ fn foo_ref(&self) {}
+ }
+ impl FooRef for &'_ () {
+ fn foo_ref(&self) {}
+ }
+ (&&()).foo_ref(); // Don't lint. `&()` will call `<() as FooRef>::foo_ref`
+
+ struct S;
+ impl From<S> for u32 {
+ fn from(s: S) -> Self {
+ (&s).into()
+ }
+ }
+ impl From<&S> for u32 {
+ fn from(s: &S) -> Self {
+ 0
+ }
+ }
+
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ let _ = std::path::Path::new(".").join(&&".");
+ deref_target_is_x(&X);
+ multiple_constraints(&[[""]]);
+ multiple_constraints_normalizes_to_same(&X, X);
+ let _ = Some("").unwrap_or(&"");
++ let _ = std::fs::write("x", &"".to_string());
+
+ only_sized(&""); // Don't lint. `Sized` is only bound
+ let _ = std::any::Any::type_id(&""); // Don't lint. `Any` is only bound
+ let _ = Box::new(&""); // Don't lint. Type parameter appears in return type
+ ref_as_ref_path(&""); // Don't lint. Argument type is not a type parameter
+ refs_only(&()); // Don't lint. `&T` implements trait, but `T` doesn't
+ multiple_constraints_normalizes_to_different(&[[""]], &[""]); // Don't lint. Projected type appears in arguments
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+#[allow(dead_code)]
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
+
+#[allow(dead_code)]
+mod issue9160 {
+ pub struct S<F> {
+ f: F,
+ }
+
+ impl<T, F> S<F>
+ where
+ F: Fn() -> T,
+ {
+ fn calls_field(&self) -> T {
+ (&self.f)()
+ }
+ }
+
+ impl<T, F> S<F>
+ where
+ F: FnMut() -> T,
+ {
+ fn calls_mut_field(&mut self) -> T {
+ (&mut self.f)()
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+struct X;
+
+impl std::ops::Deref for X {
+ type Target = X;
+ fn deref(&self) -> &Self::Target {
+ self
+ }
+}
+
+fn deref_target_is_x<T>(_: T)
+where
+ T: std::ops::Deref<Target = X>,
+{
+}
+
+fn multiple_constraints<T, U, V, X, Y>(_: T)
+where
+ T: IntoIterator<Item = U> + IntoIterator<Item = X>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+ X: IntoIterator<Item = Y>,
+ Y: AsRef<std::ffi::OsStr>,
+{
+}
+
+fn multiple_constraints_normalizes_to_same<T, U, V>(_: T, _: V)
+where
+ T: std::ops::Deref<Target = U>,
+ U: std::ops::Deref<Target = V>,
+{
+}
+
+fn only_sized<T>(_: T) {}
+
+fn ref_as_ref_path<T: 'static>(_: &'static T)
+where
+ &'static T: AsRef<std::path::Path>,
+{
+}
+
+trait RefsOnly {
+ type Referent;
+}
+
+impl<T> RefsOnly for &T {
+ type Referent = T;
+}
+
+fn refs_only<T, U>(_: T)
+where
+ T: RefsOnly<Referent = U>,
+{
+}
+
+fn multiple_constraints_normalizes_to_different<T, U, V>(_: T, _: U)
+where
+ T: IntoIterator<Item = U>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+{
+}
+
+// https://github.com/rust-lang/rust-clippy/pull/9136#pullrequestreview-1037379321
+#[allow(dead_code)]
+mod copyable_iterator {
+ #[derive(Clone, Copy)]
+ struct Iter;
+ impl Iterator for Iter {
+ type Item = ();
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
+ }
+ fn takes_iter(_: impl Iterator) {}
+ fn dont_warn(mut x: Iter) {
+ takes_iter(&mut x);
+ }
++ #[allow(unused_mut)]
+ fn warn(mut x: &mut Iter) {
+ takes_iter(&mut x)
+ }
+}
+
+mod under_msrv {
+ #![allow(dead_code)]
+ #![clippy::msrv = "1.52.0"]
+
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+mod meets_msrv {
+ #![allow(dead_code)]
+ #![clippy::msrv = "1.53.0"]
+
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+#[allow(unused)]
+fn issue9383() {
+ // Should not lint because unions need explicit deref when accessing field
+ use std::mem::ManuallyDrop;
+
+ union Coral {
+ crab: ManuallyDrop<Vec<i32>>,
+ }
+
+ union Ocean {
+ coral: ManuallyDrop<Coral>,
+ }
+
+ let mut ocean = Ocean {
+ coral: ManuallyDrop::new(Coral {
+ crab: ManuallyDrop::new(vec![1, 2, 3]),
+ }),
+ };
+
+ unsafe {
+ ManuallyDrop::drop(&mut (&mut ocean.coral).crab);
+
+ (*ocean.coral).crab = ManuallyDrop::new(vec![4, 5, 6]);
+ ManuallyDrop::drop(&mut (*ocean.coral).crab);
+
+ ManuallyDrop::drop(&mut ocean.coral);
+ }
+}
++
++#[allow(dead_code)]
++fn closure_test() {
++ let env = "env".to_owned();
++ let arg = "arg".to_owned();
++ let f = |arg| {
++ let loc = "loc".to_owned();
++ let _ = std::fs::write("x", &env); // Don't lint. In environment
++ let _ = std::fs::write("x", &arg);
++ let _ = std::fs::write("x", &loc);
++ };
++ let _ = std::fs::write("x", &env); // Don't lint. Borrowed by `f`
++ f(arg);
++}
++
++#[allow(dead_code)]
++mod significant_drop {
++ #[derive(Debug)]
++ struct X;
++
++ #[derive(Debug)]
++ struct Y;
++
++ impl Drop for Y {
++ fn drop(&mut self) {}
++ }
++
++ fn foo(x: X, y: Y) {
++ debug(&x);
++ debug(&y); // Don't lint. Has significant drop
++ }
++
++ fn debug(_: impl std::fmt::Debug) {}
++}
++
++#[allow(dead_code)]
++mod used_exactly_once {
++ fn foo(x: String) {
++ use_x(&x);
++ }
++ fn use_x(_: impl AsRef<str>) {}
++}
++
++#[allow(dead_code)]
++mod used_more_than_once {
++ fn foo(x: String) {
++ use_x(&x);
++ use_x_again(&x);
++ }
++ fn use_x(_: impl AsRef<str>) {}
++ fn use_x_again(_: impl AsRef<str>) {}
++}
--- /dev/null
- --> $DIR/needless_borrow.rs:11:15
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:15:13
++ --> $DIR/needless_borrow.rs:15:15
+ |
+LL | let _ = x(&&a); // warn
+ | ^^^ help: change this to: `&a`
+ |
+ = note: `-D clippy::needless-borrow` implied by `-D warnings`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:27:13
++ --> $DIR/needless_borrow.rs:19:13
+ |
+LL | mut_ref(&mut &mut b); // warn
+ | ^^^^^^^^^^^ help: change this to: `&mut b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:29:15
++ --> $DIR/needless_borrow.rs:31:13
+ |
+LL | &&a
+ | ^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:35:27
++ --> $DIR/needless_borrow.rs:33:15
+ |
+LL | 46 => &&a,
+ | ^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:42:15
++ --> $DIR/needless_borrow.rs:39:27
+ |
+LL | break &ref_a;
+ | ^^^^^^ help: change this to: `ref_a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:43:15
++ --> $DIR/needless_borrow.rs:46:15
+ |
+LL | let _ = x(&&&a);
+ | ^^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:44:15
++ --> $DIR/needless_borrow.rs:47:15
+ |
+LL | let _ = x(&mut &&a);
+ | ^^^^^^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:45:15
++ --> $DIR/needless_borrow.rs:48:15
+ |
+LL | let _ = x(&&&mut b);
+ | ^^^^^^^^ help: change this to: `&mut b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:48:11
++ --> $DIR/needless_borrow.rs:49:15
+ |
+LL | let _ = x(&&ref_a);
+ | ^^^^^^^ help: change this to: `ref_a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:55:13
++ --> $DIR/needless_borrow.rs:52:11
+ |
+LL | x(&b);
+ | ^^ help: change this to: `b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:56:13
++ --> $DIR/needless_borrow.rs:59:13
+ |
+LL | mut_ref(&mut x);
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:57:23
++ --> $DIR/needless_borrow.rs:60:13
+ |
+LL | mut_ref(&mut &mut x);
+ | ^^^^^^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:58:23
++ --> $DIR/needless_borrow.rs:61:23
+ |
+LL | let y: &mut i32 = &mut x;
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:67:14
++ --> $DIR/needless_borrow.rs:62:23
+ |
+LL | let y: &mut i32 = &mut &mut x;
+ | ^^^^^^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:73:14
++ --> $DIR/needless_borrow.rs:71:14
+ |
+LL | 0 => &mut x,
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:85:13
++ --> $DIR/needless_borrow.rs:77:14
+ |
+LL | 0 => &mut x,
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
- --> $DIR/needless_borrow.rs:87:22
++ --> $DIR/needless_borrow.rs:89:13
+ |
+LL | let _ = (&x).0;
+ | ^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
- --> $DIR/needless_borrow.rs:97:5
++ --> $DIR/needless_borrow.rs:91:22
+ |
+LL | let _ = unsafe { (&*x).0 };
+ | ^^^^^ help: change this to: `(*x)`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:106:5
++ --> $DIR/needless_borrow.rs:101:5
+ |
+LL | (&&()).foo();
+ | ^^^^^^ help: change this to: `(&())`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:131:51
++ --> $DIR/needless_borrow.rs:110:5
+ |
+LL | (&&5).foo();
+ | ^^^^^ help: change this to: `(&5)`
+
+error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:132:44
++ --> $DIR/needless_borrow.rs:135:51
+ |
+LL | let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ | ^^^^^^^^^^^^^ help: change this to: `["-a", "-l"]`
+
+error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:133:23
++ --> $DIR/needless_borrow.rs:136:44
+ |
+LL | let _ = std::path::Path::new(".").join(&&".");
+ | ^^^^^ help: change this to: `"."`
+
+error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:134:26
++ --> $DIR/needless_borrow.rs:137:23
+ |
+LL | deref_target_is_x(&X);
+ | ^^ help: change this to: `X`
+
+error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:135:45
++ --> $DIR/needless_borrow.rs:138:26
+ |
+LL | multiple_constraints(&[[""]]);
+ | ^^^^^^^ help: change this to: `[[""]]`
+
+error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:136:32
++ --> $DIR/needless_borrow.rs:139:45
+ |
+LL | multiple_constraints_normalizes_to_same(&X, X);
+ | ^^ help: change this to: `X`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
- --> $DIR/needless_borrow.rs:187:13
++ --> $DIR/needless_borrow.rs:140:32
+ |
+LL | let _ = Some("").unwrap_or(&"");
+ | ^^^ help: change this to: `""`
+
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:141:33
++ |
++LL | let _ = std::fs::write("x", &"".to_string());
++ | ^^^^^^^^^^^^^^^ help: change this to: `"".to_string()`
++
+error: this expression borrows a value the compiler would automatically borrow
- --> $DIR/needless_borrow.rs:196:13
++ --> $DIR/needless_borrow.rs:192:13
+ |
+LL | (&self.f)()
+ | ^^^^^^^^^ help: change this to: `(self.f)`
+
+error: this expression borrows a value the compiler would automatically borrow
- --> $DIR/needless_borrow.rs:298:55
++ --> $DIR/needless_borrow.rs:201:13
+ |
+LL | (&mut self.f)()
+ | ^^^^^^^^^^^^^ help: change this to: `(self.f)`
+
+error: the borrowed expression implements the required traits
- error: aborting due to 29 previous errors
++ --> $DIR/needless_borrow.rs:286:20
++ |
++LL | takes_iter(&mut x)
++ | ^^^^^^ help: change this to: `x`
++
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:304:55
+ |
+LL | let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ | ^^^^^^^^^^^^^ help: change this to: `["-a", "-l"]`
+
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:344:37
++ |
++LL | let _ = std::fs::write("x", &arg);
++ | ^^^^ help: change this to: `arg`
++
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:345:37
++ |
++LL | let _ = std::fs::write("x", &loc);
++ | ^^^^ help: change this to: `loc`
++
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:364:15
++ |
++LL | debug(&x);
++ | ^^ help: change this to: `x`
++
++error: the borrowed expression implements the required traits
++ --> $DIR/needless_borrow.rs:374:15
++ |
++LL | use_x(&x);
++ | ^^ help: change this to: `x`
++
++error: aborting due to 35 previous errors
+
--- /dev/null
- #![allow(unused_imports, clippy::redundant_clone)]
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![allow(unused, clippy::redundant_clone)]
+#![warn(clippy::option_as_ref_deref)]
+
+use std::ffi::{CString, OsString};
+use std::ops::{Deref, DerefMut};
+use std::path::PathBuf;
+
+fn main() {
+ let mut opt = Some(String::from("123"));
+
+ let _ = opt.clone().as_deref().map(str::len);
+
+ #[rustfmt::skip]
+ let _ = opt.clone().as_deref()
+ .map(str::len);
+
+ let _ = opt.as_deref_mut();
+
+ let _ = opt.as_deref();
+ let _ = opt.as_deref();
+ let _ = opt.as_deref_mut();
+ let _ = opt.as_deref_mut();
+ let _ = Some(CString::new(vec![]).unwrap()).as_deref();
+ let _ = Some(OsString::new()).as_deref();
+ let _ = Some(PathBuf::new()).as_deref();
+ let _ = Some(Vec::<()>::new()).as_deref();
+ let _ = Some(Vec::<()>::new()).as_deref_mut();
+
+ let _ = opt.as_deref();
+ let _ = opt.clone().as_deref_mut().map(|x| x.len());
+
+ let vc = vec![String::new()];
+ let _ = Some(1_usize).as_ref().map(|x| vc[*x].as_str()); // should not be linted
+
+ let _: Option<&str> = Some(&String::new()).as_ref().map(|x| x.as_str()); // should not be linted
+
+ let _ = opt.as_deref();
+ let _ = opt.as_deref_mut();
+
+ // Issue #5927
+ let _ = opt.as_deref();
+}
++
++fn msrv_1_39() {
++ #![clippy::msrv = "1.39"]
++
++ let opt = Some(String::from("123"));
++ let _ = opt.as_ref().map(String::as_str);
++}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ let opt = Some(String::from("123"));
++ let _ = opt.as_deref();
++}
--- /dev/null
- #![allow(unused_imports, clippy::redundant_clone)]
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![allow(unused, clippy::redundant_clone)]
+#![warn(clippy::option_as_ref_deref)]
+
+use std::ffi::{CString, OsString};
+use std::ops::{Deref, DerefMut};
+use std::path::PathBuf;
+
+fn main() {
+ let mut opt = Some(String::from("123"));
+
+ let _ = opt.clone().as_ref().map(Deref::deref).map(str::len);
+
+ #[rustfmt::skip]
+ let _ = opt.clone()
+ .as_ref().map(
+ Deref::deref
+ )
+ .map(str::len);
+
+ let _ = opt.as_mut().map(DerefMut::deref_mut);
+
+ let _ = opt.as_ref().map(String::as_str);
+ let _ = opt.as_ref().map(|x| x.as_str());
+ let _ = opt.as_mut().map(String::as_mut_str);
+ let _ = opt.as_mut().map(|x| x.as_mut_str());
+ let _ = Some(CString::new(vec![]).unwrap()).as_ref().map(CString::as_c_str);
+ let _ = Some(OsString::new()).as_ref().map(OsString::as_os_str);
+ let _ = Some(PathBuf::new()).as_ref().map(PathBuf::as_path);
+ let _ = Some(Vec::<()>::new()).as_ref().map(Vec::as_slice);
+ let _ = Some(Vec::<()>::new()).as_mut().map(Vec::as_mut_slice);
+
+ let _ = opt.as_ref().map(|x| x.deref());
+ let _ = opt.clone().as_mut().map(|x| x.deref_mut()).map(|x| x.len());
+
+ let vc = vec![String::new()];
+ let _ = Some(1_usize).as_ref().map(|x| vc[*x].as_str()); // should not be linted
+
+ let _: Option<&str> = Some(&String::new()).as_ref().map(|x| x.as_str()); // should not be linted
+
+ let _ = opt.as_ref().map(|x| &**x);
+ let _ = opt.as_mut().map(|x| &mut **x);
+
+ // Issue #5927
+ let _ = opt.as_ref().map(std::ops::Deref::deref);
+}
++
++fn msrv_1_39() {
++ #![clippy::msrv = "1.39"]
++
++ let opt = Some(String::from("123"));
++ let _ = opt.as_ref().map(String::as_str);
++}
++
++fn msrv_1_40() {
++ #![clippy::msrv = "1.40"]
++
++ let opt = Some(String::from("123"));
++ let _ = opt.as_ref().map(String::as_str);
++}
--- /dev/null
- --> $DIR/option_as_ref_deref.rs:13:13
+error: called `.as_ref().map(Deref::deref)` on an Option value. This can be done more directly by calling `opt.clone().as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:16:13
++ --> $DIR/option_as_ref_deref.rs:14:13
+ |
+LL | let _ = opt.clone().as_ref().map(Deref::deref).map(str::len);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.clone().as_deref()`
+ |
+ = note: `-D clippy::option-as-ref-deref` implied by `-D warnings`
+
+error: called `.as_ref().map(Deref::deref)` on an Option value. This can be done more directly by calling `opt.clone().as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:22:13
++ --> $DIR/option_as_ref_deref.rs:17:13
+ |
+LL | let _ = opt.clone()
+ | _____________^
+LL | | .as_ref().map(
+LL | | Deref::deref
+LL | | )
+ | |_________^ help: try using as_deref instead: `opt.clone().as_deref()`
+
+error: called `.as_mut().map(DerefMut::deref_mut)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:24:13
++ --> $DIR/option_as_ref_deref.rs:23:13
+ |
+LL | let _ = opt.as_mut().map(DerefMut::deref_mut);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`
+
+error: called `.as_ref().map(String::as_str)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:25:13
++ --> $DIR/option_as_ref_deref.rs:25:13
+ |
+LL | let _ = opt.as_ref().map(String::as_str);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
+
+error: called `.as_ref().map(|x| x.as_str())` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:26:13
++ --> $DIR/option_as_ref_deref.rs:26:13
+ |
+LL | let _ = opt.as_ref().map(|x| x.as_str());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
+
+error: called `.as_mut().map(String::as_mut_str)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:27:13
++ --> $DIR/option_as_ref_deref.rs:27:13
+ |
+LL | let _ = opt.as_mut().map(String::as_mut_str);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`
+
+error: called `.as_mut().map(|x| x.as_mut_str())` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:28:13
++ --> $DIR/option_as_ref_deref.rs:28:13
+ |
+LL | let _ = opt.as_mut().map(|x| x.as_mut_str());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`
+
+error: called `.as_ref().map(CString::as_c_str)` on an Option value. This can be done more directly by calling `Some(CString::new(vec![]).unwrap()).as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:29:13
++ --> $DIR/option_as_ref_deref.rs:29:13
+ |
+LL | let _ = Some(CString::new(vec![]).unwrap()).as_ref().map(CString::as_c_str);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(CString::new(vec![]).unwrap()).as_deref()`
+
+error: called `.as_ref().map(OsString::as_os_str)` on an Option value. This can be done more directly by calling `Some(OsString::new()).as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:30:13
++ --> $DIR/option_as_ref_deref.rs:30:13
+ |
+LL | let _ = Some(OsString::new()).as_ref().map(OsString::as_os_str);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(OsString::new()).as_deref()`
+
+error: called `.as_ref().map(PathBuf::as_path)` on an Option value. This can be done more directly by calling `Some(PathBuf::new()).as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:31:13
++ --> $DIR/option_as_ref_deref.rs:31:13
+ |
+LL | let _ = Some(PathBuf::new()).as_ref().map(PathBuf::as_path);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(PathBuf::new()).as_deref()`
+
+error: called `.as_ref().map(Vec::as_slice)` on an Option value. This can be done more directly by calling `Some(Vec::<()>::new()).as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:32:13
++ --> $DIR/option_as_ref_deref.rs:32:13
+ |
+LL | let _ = Some(Vec::<()>::new()).as_ref().map(Vec::as_slice);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `Some(Vec::<()>::new()).as_deref()`
+
+error: called `.as_mut().map(Vec::as_mut_slice)` on an Option value. This can be done more directly by calling `Some(Vec::<()>::new()).as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:34:13
++ --> $DIR/option_as_ref_deref.rs:33:13
+ |
+LL | let _ = Some(Vec::<()>::new()).as_mut().map(Vec::as_mut_slice);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `Some(Vec::<()>::new()).as_deref_mut()`
+
+error: called `.as_ref().map(|x| x.deref())` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:35:13
++ --> $DIR/option_as_ref_deref.rs:35:13
+ |
+LL | let _ = opt.as_ref().map(|x| x.deref());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
+
+error: called `.as_mut().map(|x| x.deref_mut())` on an Option value. This can be done more directly by calling `opt.clone().as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:42:13
++ --> $DIR/option_as_ref_deref.rs:36:13
+ |
+LL | let _ = opt.clone().as_mut().map(|x| x.deref_mut()).map(|x| x.len());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.clone().as_deref_mut()`
+
+error: called `.as_ref().map(|x| &**x)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
- --> $DIR/option_as_ref_deref.rs:43:13
++ --> $DIR/option_as_ref_deref.rs:43:13
+ |
+LL | let _ = opt.as_ref().map(|x| &**x);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
+
+error: called `.as_mut().map(|x| &mut **x)` on an Option value. This can be done more directly by calling `opt.as_deref_mut()` instead
- --> $DIR/option_as_ref_deref.rs:46:13
++ --> $DIR/option_as_ref_deref.rs:44:13
+ |
+LL | let _ = opt.as_mut().map(|x| &mut **x);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref_mut instead: `opt.as_deref_mut()`
+
+error: called `.as_ref().map(std::ops::Deref::deref)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
- error: aborting due to 17 previous errors
++ --> $DIR/option_as_ref_deref.rs:47:13
+ |
+LL | let _ = opt.as_ref().map(std::ops::Deref::deref);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
+
++error: called `.as_ref().map(String::as_str)` on an Option value. This can be done more directly by calling `opt.as_deref()` instead
++ --> $DIR/option_as_ref_deref.rs:61:13
++ |
++LL | let _ = opt.as_ref().map(String::as_str);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using as_deref instead: `opt.as_deref()`
++
++error: aborting due to 18 previous errors
+
--- /dev/null
+// run-rustfix
+#![warn(clippy::or_fun_call)]
+#![allow(dead_code)]
+#![allow(clippy::borrow_as_ptr, clippy::uninlined_format_args, clippy::unnecessary_wraps)]
+
+use std::collections::BTreeMap;
+use std::collections::HashMap;
+use std::time::Duration;
+
+/// Checks implementation of the `OR_FUN_CALL` lint.
+fn or_fun_call() {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Foo {
+ Foo
+ }
+ }
+
+ struct FakeDefault;
+ impl FakeDefault {
+ fn default() -> Self {
+ FakeDefault
+ }
+ }
+
+ impl Default for FakeDefault {
+ fn default() -> Self {
+ FakeDefault
+ }
+ }
+
+ enum Enum {
+ A(i32),
+ }
+
+ fn make<T>() -> T {
+ unimplemented!();
+ }
+
+ let with_enum = Some(Enum::A(1));
+ with_enum.unwrap_or(Enum::A(5));
+
+ let with_const_fn = Some(Duration::from_secs(1));
+ with_const_fn.unwrap_or(Duration::from_secs(5));
+
+ let with_constructor = Some(vec![1]);
+ with_constructor.unwrap_or_else(make);
+
+ let with_new = Some(vec![1]);
+ with_new.unwrap_or_default();
+
+ let with_const_args = Some(vec![1]);
+ with_const_args.unwrap_or_else(|| Vec::with_capacity(12));
+
+ let with_err: Result<_, ()> = Ok(vec![1]);
+ with_err.unwrap_or_else(|_| make());
+
+ let with_err_args: Result<_, ()> = Ok(vec![1]);
+ with_err_args.unwrap_or_else(|_| Vec::with_capacity(12));
+
+ let with_default_trait = Some(1);
+ with_default_trait.unwrap_or_default();
+
+ let with_default_type = Some(1);
+ with_default_type.unwrap_or_default();
+
+ let self_default = None::<FakeDefault>;
+ self_default.unwrap_or_else(<FakeDefault>::default);
+
+ let real_default = None::<FakeDefault>;
+ real_default.unwrap_or_default();
+
+ let with_vec = Some(vec![1]);
+ with_vec.unwrap_or_default();
+
+ let without_default = Some(Foo);
+ without_default.unwrap_or_else(Foo::new);
+
+ let mut map = HashMap::<u64, String>::new();
+ map.entry(42).or_default();
+
+ let mut map_vec = HashMap::<u64, Vec<i32>>::new();
+ map_vec.entry(42).or_default();
+
+ let mut btree = BTreeMap::<u64, String>::new();
+ btree.entry(42).or_default();
+
+ let mut btree_vec = BTreeMap::<u64, Vec<i32>>::new();
+ btree_vec.entry(42).or_default();
+
+ let stringy = Some(String::new());
+ let _ = stringy.unwrap_or_default();
+
+ let opt = Some(1);
+ let hello = "Hello";
+ let _ = opt.ok_or(format!("{} world.", hello));
+
+ // index
+ let map = HashMap::<u64, u64>::new();
+ let _ = Some(1).unwrap_or_else(|| map[&1]);
+ let map = BTreeMap::<u64, u64>::new();
+ let _ = Some(1).unwrap_or_else(|| map[&1]);
+ // don't lint index vec
+ let vec = vec![1];
+ let _ = Some(1).unwrap_or(vec[1]);
+}
+
+struct Foo(u8);
+struct Bar(String, Duration);
+#[rustfmt::skip]
+fn test_or_with_ctors() {
+ let opt = Some(1);
+ let opt_opt = Some(Some(1));
+ // we also test for const promotion, this makes sure we don't hit that
+ let two = 2;
+
+ let _ = opt_opt.unwrap_or(Some(2));
+ let _ = opt_opt.unwrap_or(Some(two));
+ let _ = opt.ok_or(Some(2));
+ let _ = opt.ok_or(Some(two));
+ let _ = opt.ok_or(Foo(2));
+ let _ = opt.ok_or(Foo(two));
+ let _ = opt.or(Some(2));
+ let _ = opt.or(Some(two));
+
+ let _ = Some("a".to_string()).or_else(|| Some("b".to_string()));
+
+ let b = "b".to_string();
+ let _ = Some(Bar("a".to_string(), Duration::from_secs(1)))
+ .or(Some(Bar(b, Duration::from_secs(2))));
+
+ let vec = vec!["foo"];
+ let _ = opt.ok_or(vec.len());
+
+ let array = ["foo"];
+ let _ = opt.ok_or(array.len());
+
+ let slice = &["foo"][..];
+ let _ = opt.ok_or(slice.len());
+
+ let string = "foo";
+ let _ = opt.ok_or(string.len());
+}
+
+// Issue 4514 - early return
+fn f() -> Option<()> {
+ let a = Some(1);
+ let b = 1i32;
+
+ let _ = a.unwrap_or(b.checked_mul(3)?.min(240));
+
+ Some(())
+}
+
+mod issue6675 {
+ unsafe fn ptr_to_ref<'a, T>(p: *const T) -> &'a T {
+ #[allow(unused)]
+ let x = vec![0; 1000]; // future-proofing, make this function expensive.
+ &*p
+ }
+
+ unsafe fn foo() {
+ let s = "test".to_owned();
+ let s = &s as *const _;
+ None.unwrap_or_else(|| ptr_to_ref(s));
+ }
+
+ fn bar() {
+ let s = "test".to_owned();
+ let s = &s as *const _;
+ None.unwrap_or_else(|| unsafe { ptr_to_ref(s) });
+ #[rustfmt::skip]
+ None.unwrap_or_else(|| unsafe { ptr_to_ref(s) });
+ }
+}
+
+mod issue8239 {
+ fn more_than_max_suggestion_highest_lines_0() {
+ let frames = Vec::new();
+ frames
+ .iter()
+ .map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or_default();
+ }
+
+ fn more_to_max_suggestion_highest_lines_1() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ iter.map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ let _ = "";
+ let _ = "";
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or_default();
+ }
+
+ fn equal_to_max_suggestion_highest_lines() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ iter.map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ let _ = "";
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or_default();
+ }
+
+ fn less_than_max_suggestion_highest_lines() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ let map = iter.map(|f: &String| f.to_lowercase());
+ map.reduce(|mut acc, f| {
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or_default();
+ }
+}
+
++mod issue9608 {
++ fn sig_drop() {
++ enum X {
++ X(std::fs::File),
++ Y(u32),
++ }
++
++ let _ = None.unwrap_or(X::Y(0));
++ }
++}
++
+fn main() {}
--- /dev/null
+// run-rustfix
+#![warn(clippy::or_fun_call)]
+#![allow(dead_code)]
+#![allow(clippy::borrow_as_ptr, clippy::uninlined_format_args, clippy::unnecessary_wraps)]
+
+use std::collections::BTreeMap;
+use std::collections::HashMap;
+use std::time::Duration;
+
+/// Checks implementation of the `OR_FUN_CALL` lint.
+fn or_fun_call() {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Foo {
+ Foo
+ }
+ }
+
+ struct FakeDefault;
+ impl FakeDefault {
+ fn default() -> Self {
+ FakeDefault
+ }
+ }
+
+ impl Default for FakeDefault {
+ fn default() -> Self {
+ FakeDefault
+ }
+ }
+
+ enum Enum {
+ A(i32),
+ }
+
+ fn make<T>() -> T {
+ unimplemented!();
+ }
+
+ let with_enum = Some(Enum::A(1));
+ with_enum.unwrap_or(Enum::A(5));
+
+ let with_const_fn = Some(Duration::from_secs(1));
+ with_const_fn.unwrap_or(Duration::from_secs(5));
+
+ let with_constructor = Some(vec![1]);
+ with_constructor.unwrap_or(make());
+
+ let with_new = Some(vec![1]);
+ with_new.unwrap_or(Vec::new());
+
+ let with_const_args = Some(vec![1]);
+ with_const_args.unwrap_or(Vec::with_capacity(12));
+
+ let with_err: Result<_, ()> = Ok(vec![1]);
+ with_err.unwrap_or(make());
+
+ let with_err_args: Result<_, ()> = Ok(vec![1]);
+ with_err_args.unwrap_or(Vec::with_capacity(12));
+
+ let with_default_trait = Some(1);
+ with_default_trait.unwrap_or(Default::default());
+
+ let with_default_type = Some(1);
+ with_default_type.unwrap_or(u64::default());
+
+ let self_default = None::<FakeDefault>;
+ self_default.unwrap_or(<FakeDefault>::default());
+
+ let real_default = None::<FakeDefault>;
+ real_default.unwrap_or(<FakeDefault as Default>::default());
+
+ let with_vec = Some(vec![1]);
+ with_vec.unwrap_or(vec![]);
+
+ let without_default = Some(Foo);
+ without_default.unwrap_or(Foo::new());
+
+ let mut map = HashMap::<u64, String>::new();
+ map.entry(42).or_insert(String::new());
+
+ let mut map_vec = HashMap::<u64, Vec<i32>>::new();
+ map_vec.entry(42).or_insert(vec![]);
+
+ let mut btree = BTreeMap::<u64, String>::new();
+ btree.entry(42).or_insert(String::new());
+
+ let mut btree_vec = BTreeMap::<u64, Vec<i32>>::new();
+ btree_vec.entry(42).or_insert(vec![]);
+
+ let stringy = Some(String::new());
+ let _ = stringy.unwrap_or(String::new());
+
+ let opt = Some(1);
+ let hello = "Hello";
+ let _ = opt.ok_or(format!("{} world.", hello));
+
+ // index
+ let map = HashMap::<u64, u64>::new();
+ let _ = Some(1).unwrap_or(map[&1]);
+ let map = BTreeMap::<u64, u64>::new();
+ let _ = Some(1).unwrap_or(map[&1]);
+ // don't lint index vec
+ let vec = vec![1];
+ let _ = Some(1).unwrap_or(vec[1]);
+}
+
+struct Foo(u8);
+struct Bar(String, Duration);
+#[rustfmt::skip]
+fn test_or_with_ctors() {
+ let opt = Some(1);
+ let opt_opt = Some(Some(1));
+ // we also test for const promotion, this makes sure we don't hit that
+ let two = 2;
+
+ let _ = opt_opt.unwrap_or(Some(2));
+ let _ = opt_opt.unwrap_or(Some(two));
+ let _ = opt.ok_or(Some(2));
+ let _ = opt.ok_or(Some(two));
+ let _ = opt.ok_or(Foo(2));
+ let _ = opt.ok_or(Foo(two));
+ let _ = opt.or(Some(2));
+ let _ = opt.or(Some(two));
+
+ let _ = Some("a".to_string()).or(Some("b".to_string()));
+
+ let b = "b".to_string();
+ let _ = Some(Bar("a".to_string(), Duration::from_secs(1)))
+ .or(Some(Bar(b, Duration::from_secs(2))));
+
+ let vec = vec!["foo"];
+ let _ = opt.ok_or(vec.len());
+
+ let array = ["foo"];
+ let _ = opt.ok_or(array.len());
+
+ let slice = &["foo"][..];
+ let _ = opt.ok_or(slice.len());
+
+ let string = "foo";
+ let _ = opt.ok_or(string.len());
+}
+
+// Issue 4514 - early return
+fn f() -> Option<()> {
+ let a = Some(1);
+ let b = 1i32;
+
+ let _ = a.unwrap_or(b.checked_mul(3)?.min(240));
+
+ Some(())
+}
+
+mod issue6675 {
+ unsafe fn ptr_to_ref<'a, T>(p: *const T) -> &'a T {
+ #[allow(unused)]
+ let x = vec![0; 1000]; // future-proofing, make this function expensive.
+ &*p
+ }
+
+ unsafe fn foo() {
+ let s = "test".to_owned();
+ let s = &s as *const _;
+ None.unwrap_or(ptr_to_ref(s));
+ }
+
+ fn bar() {
+ let s = "test".to_owned();
+ let s = &s as *const _;
+ None.unwrap_or(unsafe { ptr_to_ref(s) });
+ #[rustfmt::skip]
+ None.unwrap_or( unsafe { ptr_to_ref(s) } );
+ }
+}
+
+mod issue8239 {
+ fn more_than_max_suggestion_highest_lines_0() {
+ let frames = Vec::new();
+ frames
+ .iter()
+ .map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or(String::new());
+ }
+
+ fn more_to_max_suggestion_highest_lines_1() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ iter.map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ let _ = "";
+ let _ = "";
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or(String::new());
+ }
+
+ fn equal_to_max_suggestion_highest_lines() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ iter.map(|f: &String| f.to_lowercase())
+ .reduce(|mut acc, f| {
+ let _ = "";
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or(String::new());
+ }
+
+ fn less_than_max_suggestion_highest_lines() {
+ let frames = Vec::new();
+ let iter = frames.iter();
+ let map = iter.map(|f: &String| f.to_lowercase());
+ map.reduce(|mut acc, f| {
+ acc.push_str(&f);
+ acc
+ })
+ .unwrap_or(String::new());
+ }
+}
+
++mod issue9608 {
++ fn sig_drop() {
++ enum X {
++ X(std::fs::File),
++ Y(u32),
++ }
++
++ let _ = None.unwrap_or(X::Y(0));
++ }
++}
++
+fn main() {}
--- /dev/null
--- /dev/null
++#![allow(unused)]
++#![warn(clippy::partial_pub_fields)]
++
++fn main() {
++ use std::collections::HashMap;
++
++ #[derive(Default)]
++ pub struct FileSet {
++ files: HashMap<String, u32>,
++ pub paths: HashMap<u32, String>,
++ }
++
++ pub struct Color {
++ pub r: u8,
++ pub g: u8,
++ b: u8,
++ }
++
++ pub struct Point(i32, pub i32);
++
++ pub struct Visibility {
++ r#pub: bool,
++ pub pos: u32,
++ }
++
++ // Don't lint on empty structs;
++ pub struct Empty1;
++ pub struct Empty2();
++ pub struct Empty3 {};
++
++ // Don't lint on structs with one field.
++ pub struct Single1(i32);
++ pub struct Single2(pub i32);
++ pub struct Single3 {
++ v1: i32,
++ }
++ pub struct Single4 {
++ pub v1: i32,
++ }
++}
--- /dev/null
--- /dev/null
++error: mixed usage of pub and non-pub fields
++ --> $DIR/partial_pub_fields.rs:10:9
++ |
++LL | pub paths: HashMap<u32, String>,
++ | ^^^
++ |
++ = help: consider using private field here
++ = note: `-D clippy::partial-pub-fields` implied by `-D warnings`
++
++error: mixed usage of pub and non-pub fields
++ --> $DIR/partial_pub_fields.rs:16:9
++ |
++LL | b: u8,
++ | ^
++ |
++ = help: consider using public field here
++
++error: mixed usage of pub and non-pub fields
++ --> $DIR/partial_pub_fields.rs:19:27
++ |
++LL | pub struct Point(i32, pub i32);
++ | ^^^
++ |
++ = help: consider using private field here
++
++error: mixed usage of pub and non-pub fields
++ --> $DIR/partial_pub_fields.rs:23:9
++ |
++LL | pub pos: u32,
++ | ^^^
++ |
++ = help: consider using private field here
++
++error: aborting due to 4 previous errors
++
--- /dev/null
- use std::path::PathBuf;
+#![feature(lint_reasons)]
+#![allow(unused, clippy::many_single_char_names, clippy::redundant_clone)]
+#![warn(clippy::ptr_arg)]
+
+use std::borrow::Cow;
++use std::path::{Path, PathBuf};
+
+fn do_vec(x: &Vec<i64>) {
+ //Nothing here
+}
+
+fn do_vec_mut(x: &mut Vec<i64>) {
+ //Nothing here
+}
+
+fn do_str(x: &String) {
+ //Nothing here either
+}
+
+fn do_str_mut(x: &mut String) {
+ //Nothing here either
+}
+
+fn do_path(x: &PathBuf) {
+ //Nothing here either
+}
+
+fn do_path_mut(x: &mut PathBuf) {
+ //Nothing here either
+}
+
+fn main() {}
+
+trait Foo {
+ type Item;
+ fn do_vec(x: &Vec<i64>);
+ fn do_item(x: &Self::Item);
+}
+
+struct Bar;
+
+// no error, in trait impl (#425)
+impl Foo for Bar {
+ type Item = Vec<u8>;
+ fn do_vec(x: &Vec<i64>) {}
+ fn do_item(x: &Vec<u8>) {}
+}
+
+fn cloned(x: &Vec<u8>) -> Vec<u8> {
+ let e = x.clone();
+ let f = e.clone(); // OK
+ let g = x;
+ let h = g.clone();
+ let i = (e).clone();
+ x.clone()
+}
+
+fn str_cloned(x: &String) -> String {
+ let a = x.clone();
+ let b = x.clone();
+ let c = b.clone();
+ let d = a.clone().clone().clone();
+ x.clone()
+}
+
+fn path_cloned(x: &PathBuf) -> PathBuf {
+ let a = x.clone();
+ let b = x.clone();
+ let c = b.clone();
+ let d = a.clone().clone().clone();
+ x.clone()
+}
+
+fn false_positive_capacity(x: &Vec<u8>, y: &String) {
+ let a = x.capacity();
+ let b = y.clone();
+ let c = y.as_str();
+}
+
+fn false_positive_capacity_too(x: &String) -> String {
+ if x.capacity() > 1024 {
+ panic!("Too large!");
+ }
+ x.clone()
+}
+
+#[allow(dead_code)]
+fn test_cow_with_ref(c: &Cow<[i32]>) {}
+
+fn test_cow(c: Cow<[i32]>) {
+ let _c = c;
+}
+
+trait Foo2 {
+ fn do_string(&self);
+}
+
+// no error for &self references where self is of type String (#2293)
+impl Foo2 for String {
+ fn do_string(&self) {}
+}
+
+// Check that the allow attribute on parameters is honored
+mod issue_5644 {
+ use std::borrow::Cow;
+ use std::path::PathBuf;
+
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ #[expect(clippy::ptr_arg)] _expect: &Cow<[i32]>,
+ ) {
+ }
+
+ fn some_allowed(#[allow(clippy::ptr_arg)] _v: &Vec<u32>, _s: &String) {}
+
+ struct S;
+ impl S {
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ #[expect(clippy::ptr_arg)] _expect: &Cow<[i32]>,
+ ) {
+ }
+ }
+
+ trait T {
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ #[expect(clippy::ptr_arg)] _expect: &Cow<[i32]>,
+ ) {
+ }
+ }
+}
+
+mod issue6509 {
+ use std::path::PathBuf;
+
+ fn foo_vec(vec: &Vec<u8>) {
+ let _ = vec.clone().pop();
+ let _ = vec.clone().clone();
+ }
+
+ fn foo_path(path: &PathBuf) {
+ let _ = path.clone().pop();
+ let _ = path.clone().clone();
+ }
+
+ fn foo_str(str: &PathBuf) {
+ let _ = str.clone().pop();
+ let _ = str.clone().clone();
+ }
+}
+
+fn mut_vec_slice_methods(v: &mut Vec<u32>) {
+ v.copy_within(1..5, 10);
+}
+
+fn mut_vec_vec_methods(v: &mut Vec<u32>) {
+ v.clear();
+}
+
+fn vec_contains(v: &Vec<u32>) -> bool {
+ [vec![], vec![0]].as_slice().contains(v)
+}
+
+fn fn_requires_vec(v: &Vec<u32>) -> bool {
+ vec_contains(v)
+}
+
+fn impl_fn_requires_vec(v: &Vec<u32>, f: impl Fn(&Vec<u32>)) {
+ f(v);
+}
+
+fn dyn_fn_requires_vec(v: &Vec<u32>, f: &dyn Fn(&Vec<u32>)) {
+ f(v);
+}
+
+// No error for types behind an alias (#7699)
+type A = Vec<u8>;
+fn aliased(a: &A) {}
+
+// Issue #8366
+pub trait Trait {
+ fn f(v: &mut Vec<i32>);
+ fn f2(v: &mut Vec<i32>) {}
+}
+
+// Issue #8463
+fn two_vecs(a: &mut Vec<u32>, b: &mut Vec<u32>) {
+ a.push(0);
+ a.push(0);
+ a.push(0);
+ b.push(1);
+}
+
+// Issue #8495
+fn cow_conditional_to_mut(a: &mut Cow<str>) {
+ if a.is_empty() {
+ a.to_mut().push_str("foo");
+ }
+}
++
++// Issue #9542
++fn dyn_trait_ok(a: &mut Vec<u32>, b: &mut String, c: &mut PathBuf) {
++ trait T {}
++ impl<U> T for Vec<U> {}
++ impl T for String {}
++ impl T for PathBuf {}
++ fn takes_dyn(_: &mut dyn T) {}
++
++ takes_dyn(a);
++ takes_dyn(b);
++ takes_dyn(c);
++}
++
++fn dyn_trait(a: &mut Vec<u32>, b: &mut String, c: &mut PathBuf) {
++ trait T {}
++ impl<U> T for Vec<U> {}
++ impl<U> T for [U] {}
++ impl T for String {}
++ impl T for str {}
++ impl T for PathBuf {}
++ impl T for Path {}
++ fn takes_dyn(_: &mut dyn T) {}
++
++ takes_dyn(a);
++ takes_dyn(b);
++ takes_dyn(c);
++}
--- /dev/null
- error: aborting due to 17 previous errors
+error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:8:14
+ |
+LL | fn do_vec(x: &Vec<i64>) {
+ | ^^^^^^^^^ help: change this to: `&[i64]`
+ |
+ = note: `-D clippy::ptr-arg` implied by `-D warnings`
+
+error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:12:18
+ |
+LL | fn do_vec_mut(x: &mut Vec<i64>) {
+ | ^^^^^^^^^^^^^ help: change this to: `&mut [i64]`
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:16:14
+ |
+LL | fn do_str(x: &String) {
+ | ^^^^^^^ help: change this to: `&str`
+
+error: writing `&mut String` instead of `&mut str` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:20:18
+ |
+LL | fn do_str_mut(x: &mut String) {
+ | ^^^^^^^^^^^ help: change this to: `&mut str`
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:24:15
+ |
+LL | fn do_path(x: &PathBuf) {
+ | ^^^^^^^^ help: change this to: `&Path`
+
+error: writing `&mut PathBuf` instead of `&mut Path` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:28:19
+ |
+LL | fn do_path_mut(x: &mut PathBuf) {
+ | ^^^^^^^^^^^^ help: change this to: `&mut Path`
+
+error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:36:18
+ |
+LL | fn do_vec(x: &Vec<i64>);
+ | ^^^^^^^^^ help: change this to: `&[i64]`
+
+error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:49:14
+ |
+LL | fn cloned(x: &Vec<u8>) -> Vec<u8> {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn cloned(x: &[u8]) -> Vec<u8> {
+LL ~ let e = x.to_owned();
+LL | let f = e.clone(); // OK
+LL | let g = x;
+LL ~ let h = g.to_owned();
+LL | let i = (e).clone();
+LL ~ x.to_owned()
+ |
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:58:18
+ |
+LL | fn str_cloned(x: &String) -> String {
+ | ^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn str_cloned(x: &str) -> String {
+LL ~ let a = x.to_owned();
+LL ~ let b = x.to_owned();
+LL | let c = b.clone();
+LL | let d = a.clone().clone().clone();
+LL ~ x.to_owned()
+ |
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:66:19
+ |
+LL | fn path_cloned(x: &PathBuf) -> PathBuf {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn path_cloned(x: &Path) -> PathBuf {
+LL ~ let a = x.to_path_buf();
+LL ~ let b = x.to_path_buf();
+LL | let c = b.clone();
+LL | let d = a.clone().clone().clone();
+LL ~ x.to_path_buf()
+ |
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:74:44
+ |
+LL | fn false_positive_capacity(x: &Vec<u8>, y: &String) {
+ | ^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn false_positive_capacity(x: &Vec<u8>, y: &str) {
+LL | let a = x.capacity();
+LL ~ let b = y.to_owned();
+LL ~ let c = y;
+ |
+
+error: using a reference to `Cow` is not recommended
+ --> $DIR/ptr_arg.rs:88:25
+ |
+LL | fn test_cow_with_ref(c: &Cow<[i32]>) {}
+ | ^^^^^^^^^^^ help: change this to: `&[i32]`
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:117:66
+ |
+LL | fn some_allowed(#[allow(clippy::ptr_arg)] _v: &Vec<u32>, _s: &String) {}
+ | ^^^^^^^ help: change this to: `&str`
+
+error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:146:21
+ |
+LL | fn foo_vec(vec: &Vec<u8>) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn foo_vec(vec: &[u8]) {
+LL ~ let _ = vec.to_owned().pop();
+LL ~ let _ = vec.to_owned().clone();
+ |
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:151:23
+ |
+LL | fn foo_path(path: &PathBuf) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn foo_path(path: &Path) {
+LL ~ let _ = path.to_path_buf().pop();
+LL ~ let _ = path.to_path_buf().clone();
+ |
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:156:21
+ |
+LL | fn foo_str(str: &PathBuf) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
+LL ~ fn foo_str(str: &Path) {
+LL ~ let _ = str.to_path_buf().pop();
+LL ~ let _ = str.to_path_buf().clone();
+ |
+
+error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:162:29
+ |
+LL | fn mut_vec_slice_methods(v: &mut Vec<u32>) {
+ | ^^^^^^^^^^^^^ help: change this to: `&mut [u32]`
+
++error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:224:17
++ |
++LL | fn dyn_trait(a: &mut Vec<u32>, b: &mut String, c: &mut PathBuf) {
++ | ^^^^^^^^^^^^^ help: change this to: `&mut [u32]`
++
++error: writing `&mut String` instead of `&mut str` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:224:35
++ |
++LL | fn dyn_trait(a: &mut Vec<u32>, b: &mut String, c: &mut PathBuf) {
++ | ^^^^^^^^^^^ help: change this to: `&mut str`
++
++error: writing `&mut PathBuf` instead of `&mut Path` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:224:51
++ |
++LL | fn dyn_trait(a: &mut Vec<u32>, b: &mut String, c: &mut PathBuf) {
++ | ^^^^^^^^^^^^ help: change this to: `&mut Path`
++
++error: aborting due to 20 previous errors
+
--- /dev/null
- #[warn(clippy::manual_range_contains)]
- #[allow(unused)]
- #[allow(clippy::no_effect)]
- #[allow(clippy::short_circuit_statement)]
- #[allow(clippy::unnecessary_operation)]
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![warn(clippy::manual_range_contains)]
++#![allow(unused)]
++#![allow(clippy::no_effect)]
++#![allow(clippy::short_circuit_statement)]
++#![allow(clippy::unnecessary_operation)]
++
+fn main() {
+ let x = 9_i32;
+
+ // order shouldn't matter
+ (8..12).contains(&x);
+ (21..42).contains(&x);
+ (1..100).contains(&x);
+
+ // also with inclusive ranges
+ (9..=99).contains(&x);
+ (1..=33).contains(&x);
+ (1..=999).contains(&x);
+
+ // and the outside
+ !(8..12).contains(&x);
+ !(21..42).contains(&x);
+ !(1..100).contains(&x);
+
+ // also with the outside of inclusive ranges
+ !(9..=99).contains(&x);
+ !(1..=33).contains(&x);
+ !(1..=999).contains(&x);
+
+ // not a range.contains
+ x > 8 && x < 12; // lower bound not inclusive
+ x < 8 && x <= 12; // same direction
+ x >= 12 && 12 >= x; // same bounds
+ x < 8 && x > 12; // wrong direction
+
+ x <= 8 || x >= 12;
+ x >= 8 || x >= 12;
+ x < 12 || 12 < x;
+ x >= 8 || x <= 12;
+
+ // Fix #6315
+ let y = 3.;
+ (0. ..1.).contains(&y);
+ !(0. ..=1.).contains(&y);
+
+ // handle negatives #8721
+ (-10..=10).contains(&x);
+ x >= 10 && x <= -10;
+ (-3. ..=3.).contains(&y);
+ y >= 3. && y <= -3.;
+
+ // Fix #8745
+ let z = 42;
+ (0..=10).contains(&x) && (0..=10).contains(&z);
+ !(0..10).contains(&x) || !(0..10).contains(&z);
+ // Make sure operators in parens don't give a breaking suggestion
+ ((x % 2 == 0) || (x < 0)) || (x >= 10);
+}
+
+// Fix #6373
+pub const fn in_range(a: i32) -> bool {
+ 3 <= a && a <= 20
+}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let x = 5;
++ x >= 8 && x < 34;
++}
++
++fn msrv_1_35() {
++ #![clippy::msrv = "1.35"]
++
++ let x = 5;
++ (8..35).contains(&x);
++}
--- /dev/null
- #[warn(clippy::manual_range_contains)]
- #[allow(unused)]
- #[allow(clippy::no_effect)]
- #[allow(clippy::short_circuit_statement)]
- #[allow(clippy::unnecessary_operation)]
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
++#![warn(clippy::manual_range_contains)]
++#![allow(unused)]
++#![allow(clippy::no_effect)]
++#![allow(clippy::short_circuit_statement)]
++#![allow(clippy::unnecessary_operation)]
++
+fn main() {
+ let x = 9_i32;
+
+ // order shouldn't matter
+ x >= 8 && x < 12;
+ x < 42 && x >= 21;
+ 100 > x && 1 <= x;
+
+ // also with inclusive ranges
+ x >= 9 && x <= 99;
+ x <= 33 && x >= 1;
+ 999 >= x && 1 <= x;
+
+ // and the outside
+ x < 8 || x >= 12;
+ x >= 42 || x < 21;
+ 100 <= x || 1 > x;
+
+ // also with the outside of inclusive ranges
+ x < 9 || x > 99;
+ x > 33 || x < 1;
+ 999 < x || 1 > x;
+
+ // not a range.contains
+ x > 8 && x < 12; // lower bound not inclusive
+ x < 8 && x <= 12; // same direction
+ x >= 12 && 12 >= x; // same bounds
+ x < 8 && x > 12; // wrong direction
+
+ x <= 8 || x >= 12;
+ x >= 8 || x >= 12;
+ x < 12 || 12 < x;
+ x >= 8 || x <= 12;
+
+ // Fix #6315
+ let y = 3.;
+ y >= 0. && y < 1.;
+ y < 0. || y > 1.;
+
+ // handle negatives #8721
+ x >= -10 && x <= 10;
+ x >= 10 && x <= -10;
+ y >= -3. && y <= 3.;
+ y >= 3. && y <= -3.;
+
+ // Fix #8745
+ let z = 42;
+ (x >= 0) && (x <= 10) && (z >= 0) && (z <= 10);
+ (x < 0) || (x >= 10) || (z < 0) || (z >= 10);
+ // Make sure operators in parens don't give a breaking suggestion
+ ((x % 2 == 0) || (x < 0)) || (x >= 10);
+}
+
+// Fix #6373
+pub const fn in_range(a: i32) -> bool {
+ 3 <= a && a <= 20
+}
++
++fn msrv_1_34() {
++ #![clippy::msrv = "1.34"]
++
++ let x = 5;
++ x >= 8 && x < 34;
++}
++
++fn msrv_1_35() {
++ #![clippy::msrv = "1.35"]
++
++ let x = 5;
++ x >= 8 && x < 35;
++}
--- /dev/null
- --> $DIR/range_contains.rs:12:5
+error: manual `Range::contains` implementation
- --> $DIR/range_contains.rs:13:5
++ --> $DIR/range_contains.rs:14:5
+ |
+LL | x >= 8 && x < 12;
+ | ^^^^^^^^^^^^^^^^ help: use: `(8..12).contains(&x)`
+ |
+ = note: `-D clippy::manual-range-contains` implied by `-D warnings`
+
+error: manual `Range::contains` implementation
- --> $DIR/range_contains.rs:14:5
++ --> $DIR/range_contains.rs:15:5
+ |
+LL | x < 42 && x >= 21;
+ | ^^^^^^^^^^^^^^^^^ help: use: `(21..42).contains(&x)`
+
+error: manual `Range::contains` implementation
- --> $DIR/range_contains.rs:17:5
++ --> $DIR/range_contains.rs:16:5
+ |
+LL | 100 > x && 1 <= x;
+ | ^^^^^^^^^^^^^^^^^ help: use: `(1..100).contains(&x)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:18:5
++ --> $DIR/range_contains.rs:19:5
+ |
+LL | x >= 9 && x <= 99;
+ | ^^^^^^^^^^^^^^^^^ help: use: `(9..=99).contains(&x)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:19:5
++ --> $DIR/range_contains.rs:20:5
+ |
+LL | x <= 33 && x >= 1;
+ | ^^^^^^^^^^^^^^^^^ help: use: `(1..=33).contains(&x)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:22:5
++ --> $DIR/range_contains.rs:21:5
+ |
+LL | 999 >= x && 1 <= x;
+ | ^^^^^^^^^^^^^^^^^^ help: use: `(1..=999).contains(&x)`
+
+error: manual `!Range::contains` implementation
- --> $DIR/range_contains.rs:23:5
++ --> $DIR/range_contains.rs:24:5
+ |
+LL | x < 8 || x >= 12;
+ | ^^^^^^^^^^^^^^^^ help: use: `!(8..12).contains(&x)`
+
+error: manual `!Range::contains` implementation
- --> $DIR/range_contains.rs:24:5
++ --> $DIR/range_contains.rs:25:5
+ |
+LL | x >= 42 || x < 21;
+ | ^^^^^^^^^^^^^^^^^ help: use: `!(21..42).contains(&x)`
+
+error: manual `!Range::contains` implementation
- --> $DIR/range_contains.rs:27:5
++ --> $DIR/range_contains.rs:26:5
+ |
+LL | 100 <= x || 1 > x;
+ | ^^^^^^^^^^^^^^^^^ help: use: `!(1..100).contains(&x)`
+
+error: manual `!RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:28:5
++ --> $DIR/range_contains.rs:29:5
+ |
+LL | x < 9 || x > 99;
+ | ^^^^^^^^^^^^^^^ help: use: `!(9..=99).contains(&x)`
+
+error: manual `!RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:29:5
++ --> $DIR/range_contains.rs:30:5
+ |
+LL | x > 33 || x < 1;
+ | ^^^^^^^^^^^^^^^ help: use: `!(1..=33).contains(&x)`
+
+error: manual `!RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:44:5
++ --> $DIR/range_contains.rs:31:5
+ |
+LL | 999 < x || 1 > x;
+ | ^^^^^^^^^^^^^^^^ help: use: `!(1..=999).contains(&x)`
+
+error: manual `Range::contains` implementation
- --> $DIR/range_contains.rs:45:5
++ --> $DIR/range_contains.rs:46:5
+ |
+LL | y >= 0. && y < 1.;
+ | ^^^^^^^^^^^^^^^^^ help: use: `(0. ..1.).contains(&y)`
+
+error: manual `!RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:48:5
++ --> $DIR/range_contains.rs:47:5
+ |
+LL | y < 0. || y > 1.;
+ | ^^^^^^^^^^^^^^^^ help: use: `!(0. ..=1.).contains(&y)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:50:5
++ --> $DIR/range_contains.rs:50:5
+ |
+LL | x >= -10 && x <= 10;
+ | ^^^^^^^^^^^^^^^^^^^ help: use: `(-10..=10).contains(&x)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:55:30
++ --> $DIR/range_contains.rs:52:5
+ |
+LL | y >= -3. && y <= 3.;
+ | ^^^^^^^^^^^^^^^^^^^ help: use: `(-3. ..=3.).contains(&y)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:55:5
++ --> $DIR/range_contains.rs:57:30
+ |
+LL | (x >= 0) && (x <= 10) && (z >= 0) && (z <= 10);
+ | ^^^^^^^^^^^^^^^^^^^^^ help: use: `(0..=10).contains(&z)`
+
+error: manual `RangeInclusive::contains` implementation
- --> $DIR/range_contains.rs:56:29
++ --> $DIR/range_contains.rs:57:5
+ |
+LL | (x >= 0) && (x <= 10) && (z >= 0) && (z <= 10);
+ | ^^^^^^^^^^^^^^^^^^^^^ help: use: `(0..=10).contains(&x)`
+
+error: manual `!Range::contains` implementation
- --> $DIR/range_contains.rs:56:5
++ --> $DIR/range_contains.rs:58:29
+ |
+LL | (x < 0) || (x >= 10) || (z < 0) || (z >= 10);
+ | ^^^^^^^^^^^^^^^^^^^^ help: use: `!(0..10).contains(&z)`
+
+error: manual `!Range::contains` implementation
- error: aborting due to 20 previous errors
++ --> $DIR/range_contains.rs:58:5
+ |
+LL | (x < 0) || (x >= 10) || (z < 0) || (z >= 10);
+ | ^^^^^^^^^^^^^^^^^^^^ help: use: `!(0..10).contains(&x)`
+
++error: manual `Range::contains` implementation
++ --> $DIR/range_contains.rs:79:5
++ |
++LL | x >= 8 && x < 35;
++ | ^^^^^^^^^^^^^^^^ help: use: `(8..35).contains(&x)`
++
++error: aborting due to 21 previous errors
+
--- /dev/null
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::redundant_field_names)]
+#![allow(clippy::no_effect, dead_code, unused_variables)]
+
+#[macro_use]
+extern crate derive_new;
+
+use std::ops::{Range, RangeFrom, RangeInclusive, RangeTo, RangeToInclusive};
+
+mod foo {
+ pub const BAR: u8 = 0;
+}
+
+struct Person {
+ gender: u8,
+ age: u8,
+ name: u8,
+ buzz: u64,
+ foo: u8,
+}
+
+#[derive(new)]
+pub struct S {
+ v: String,
+}
+
+fn main() {
+ let gender: u8 = 42;
+ let age = 0;
+ let fizz: u64 = 0;
+ let name: u8 = 0;
+
+ let me = Person {
+ gender,
+ age,
+
+ name, //should be ok
+ buzz: fizz, //should be ok
+ foo: foo::BAR, //should be ok
+ };
+
+ // Range expressions
+ let (start, end) = (0, 0);
+
+ let _ = start..;
+ let _ = ..end;
+ let _ = start..end;
+
+ let _ = ..=end;
+ let _ = start..=end;
+
+ // Issue #2799
+ let _: Vec<_> = (start..end).collect();
+
+ // hand-written Range family structs are linted
+ let _ = RangeFrom { start };
+ let _ = RangeTo { end };
+ let _ = Range { start, end };
+ let _ = RangeInclusive::new(start, end);
+ let _ = RangeToInclusive { end };
+}
+
+fn issue_3476() {
+ fn foo<T>() {}
+
+ struct S {
+ foo: fn(),
+ }
+
+ S { foo: foo::<i32> };
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ let start = 0;
++ let _ = RangeFrom { start: start };
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ let start = 0;
++ let _ = RangeFrom { start };
++}
--- /dev/null
+// run-rustfix
++
++#![feature(custom_inner_attributes)]
+#![warn(clippy::redundant_field_names)]
+#![allow(clippy::no_effect, dead_code, unused_variables)]
+
+#[macro_use]
+extern crate derive_new;
+
+use std::ops::{Range, RangeFrom, RangeInclusive, RangeTo, RangeToInclusive};
+
+mod foo {
+ pub const BAR: u8 = 0;
+}
+
+struct Person {
+ gender: u8,
+ age: u8,
+ name: u8,
+ buzz: u64,
+ foo: u8,
+}
+
+#[derive(new)]
+pub struct S {
+ v: String,
+}
+
+fn main() {
+ let gender: u8 = 42;
+ let age = 0;
+ let fizz: u64 = 0;
+ let name: u8 = 0;
+
+ let me = Person {
+ gender: gender,
+ age: age,
+
+ name, //should be ok
+ buzz: fizz, //should be ok
+ foo: foo::BAR, //should be ok
+ };
+
+ // Range expressions
+ let (start, end) = (0, 0);
+
+ let _ = start..;
+ let _ = ..end;
+ let _ = start..end;
+
+ let _ = ..=end;
+ let _ = start..=end;
+
+ // Issue #2799
+ let _: Vec<_> = (start..end).collect();
+
+ // hand-written Range family structs are linted
+ let _ = RangeFrom { start: start };
+ let _ = RangeTo { end: end };
+ let _ = Range { start: start, end: end };
+ let _ = RangeInclusive::new(start, end);
+ let _ = RangeToInclusive { end: end };
+}
+
+fn issue_3476() {
+ fn foo<T>() {}
+
+ struct S {
+ foo: fn(),
+ }
+
+ S { foo: foo::<i32> };
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ let start = 0;
++ let _ = RangeFrom { start: start };
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ let start = 0;
++ let _ = RangeFrom { start: start };
++}
--- /dev/null
- --> $DIR/redundant_field_names.rs:34:9
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:35:9
++ --> $DIR/redundant_field_names.rs:36:9
+ |
+LL | gender: gender,
+ | ^^^^^^^^^^^^^^ help: replace it with: `gender`
+ |
+ = note: `-D clippy::redundant-field-names` implied by `-D warnings`
+
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:56:25
++ --> $DIR/redundant_field_names.rs:37:9
+ |
+LL | age: age,
+ | ^^^^^^^^ help: replace it with: `age`
+
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:57:23
++ --> $DIR/redundant_field_names.rs:58:25
+ |
+LL | let _ = RangeFrom { start: start };
+ | ^^^^^^^^^^^^ help: replace it with: `start`
+
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:58:21
++ --> $DIR/redundant_field_names.rs:59:23
+ |
+LL | let _ = RangeTo { end: end };
+ | ^^^^^^^^ help: replace it with: `end`
+
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:58:35
++ --> $DIR/redundant_field_names.rs:60:21
+ |
+LL | let _ = Range { start: start, end: end };
+ | ^^^^^^^^^^^^ help: replace it with: `start`
+
+error: redundant field names in struct initialization
- --> $DIR/redundant_field_names.rs:60:32
++ --> $DIR/redundant_field_names.rs:60:35
+ |
+LL | let _ = Range { start: start, end: end };
+ | ^^^^^^^^ help: replace it with: `end`
+
+error: redundant field names in struct initialization
- error: aborting due to 7 previous errors
++ --> $DIR/redundant_field_names.rs:62:32
+ |
+LL | let _ = RangeToInclusive { end: end };
+ | ^^^^^^^^ help: replace it with: `end`
+
++error: redundant field names in struct initialization
++ --> $DIR/redundant_field_names.rs:86:25
++ |
++LL | let _ = RangeFrom { start: start };
++ | ^^^^^^^^^^^^ help: replace it with: `start`
++
++error: aborting due to 8 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(unused)]
+
+#[derive(Debug)]
+struct Foo;
+
+const VAR_ONE: &str = "Test constant #1"; // ERROR Consider removing 'static.
+
+const VAR_TWO: &str = "Test constant #2"; // This line should not raise a warning.
+
+const VAR_THREE: &[&str] = &["one", "two"]; // ERROR Consider removing 'static
+
+const VAR_FOUR: (&str, (&str, &str), &str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static
+
+const VAR_SIX: &u8 = &5;
+
+const VAR_HEIGHT: &Foo = &Foo {};
+
+const VAR_SLICE: &[u8] = b"Test constant #1"; // ERROR Consider removing 'static.
+
+const VAR_TUPLE: &(u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+
+const VAR_ARRAY: &[u8; 1] = b"T"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_ONE: &str = "Test static #1"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_TWO: &str = "Test static #2"; // This line should not raise a warning.
+
+static STATIC_VAR_THREE: &[&str] = &["one", "two"]; // ERROR Consider removing 'static
+
+static STATIC_VAR_SIX: &u8 = &5;
+
+static STATIC_VAR_HEIGHT: &Foo = &Foo {};
+
+static STATIC_VAR_SLICE: &[u8] = b"Test static #3"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_TUPLE: &(u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+
+static STATIC_VAR_ARRAY: &[u8; 1] = b"T"; // ERROR Consider removing 'static.
+
+fn main() {
+ let false_positive: &'static str = "test";
+}
+
+trait Bar {
+ const TRAIT_VAR: &'static str;
+}
+
+impl Foo {
+ const IMPL_VAR: &'static str = "var";
+}
+
+impl Bar for Foo {
+ const TRAIT_VAR: &'static str = "foo";
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ static V: &'static u8 = &16;
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ static V: &u8 = &17;
++}
--- /dev/null
+// run-rustfix
+
++#![feature(custom_inner_attributes)]
+#![allow(unused)]
+
+#[derive(Debug)]
+struct Foo;
+
+const VAR_ONE: &'static str = "Test constant #1"; // ERROR Consider removing 'static.
+
+const VAR_TWO: &str = "Test constant #2"; // This line should not raise a warning.
+
+const VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static
+
+const VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static
+
+const VAR_SIX: &'static u8 = &5;
+
+const VAR_HEIGHT: &'static Foo = &Foo {};
+
+const VAR_SLICE: &'static [u8] = b"Test constant #1"; // ERROR Consider removing 'static.
+
+const VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+
+const VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_ONE: &'static str = "Test static #1"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_TWO: &str = "Test static #2"; // This line should not raise a warning.
+
+static STATIC_VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static
+
+static STATIC_VAR_SIX: &'static u8 = &5;
+
+static STATIC_VAR_HEIGHT: &'static Foo = &Foo {};
+
+static STATIC_VAR_SLICE: &'static [u8] = b"Test static #3"; // ERROR Consider removing 'static.
+
+static STATIC_VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+
+static STATIC_VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static.
+
+fn main() {
+ let false_positive: &'static str = "test";
+}
+
+trait Bar {
+ const TRAIT_VAR: &'static str;
+}
+
+impl Foo {
+ const IMPL_VAR: &'static str = "var";
+}
+
+impl Bar for Foo {
+ const TRAIT_VAR: &'static str = "foo";
+}
++
++fn msrv_1_16() {
++ #![clippy::msrv = "1.16"]
++
++ static V: &'static u8 = &16;
++}
++
++fn msrv_1_17() {
++ #![clippy::msrv = "1.17"]
++
++ static V: &'static u8 = &17;
++}
--- /dev/null
- --> $DIR/redundant_static_lifetimes.rs:8:17
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:12:21
++ --> $DIR/redundant_static_lifetimes.rs:9:17
+ |
+LL | const VAR_ONE: &'static str = "Test constant #1"; // ERROR Consider removing 'static.
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+ |
+ = note: `-D clippy::redundant-static-lifetimes` implied by `-D warnings`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:14:32
++ --> $DIR/redundant_static_lifetimes.rs:13:21
+ |
+LL | const VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:14:47
++ --> $DIR/redundant_static_lifetimes.rs:15:32
+ |
+LL | const VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:16:17
++ --> $DIR/redundant_static_lifetimes.rs:15:47
+ |
+LL | const VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:18:20
++ --> $DIR/redundant_static_lifetimes.rs:17:17
+ |
+LL | const VAR_SIX: &'static u8 = &5;
+ | -^^^^^^^--- help: consider removing `'static`: `&u8`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:20:19
++ --> $DIR/redundant_static_lifetimes.rs:19:20
+ |
+LL | const VAR_HEIGHT: &'static Foo = &Foo {};
+ | -^^^^^^^---- help: consider removing `'static`: `&Foo`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:22:19
++ --> $DIR/redundant_static_lifetimes.rs:21:19
+ |
+LL | const VAR_SLICE: &'static [u8] = b"Test constant #1"; // ERROR Consider removing 'static.
+ | -^^^^^^^----- help: consider removing `'static`: `&[u8]`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:24:19
++ --> $DIR/redundant_static_lifetimes.rs:23:19
+ |
+LL | const VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+ | -^^^^^^^--------- help: consider removing `'static`: `&(u8, u8)`
+
+error: constants have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:26:25
++ --> $DIR/redundant_static_lifetimes.rs:25:19
+ |
+LL | const VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static.
+ | -^^^^^^^-------- help: consider removing `'static`: `&[u8; 1]`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:30:29
++ --> $DIR/redundant_static_lifetimes.rs:27:25
+ |
+LL | static STATIC_VAR_ONE: &'static str = "Test static #1"; // ERROR Consider removing 'static.
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:32:25
++ --> $DIR/redundant_static_lifetimes.rs:31:29
+ |
+LL | static STATIC_VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static
+ | -^^^^^^^---- help: consider removing `'static`: `&str`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:34:28
++ --> $DIR/redundant_static_lifetimes.rs:33:25
+ |
+LL | static STATIC_VAR_SIX: &'static u8 = &5;
+ | -^^^^^^^--- help: consider removing `'static`: `&u8`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:36:27
++ --> $DIR/redundant_static_lifetimes.rs:35:28
+ |
+LL | static STATIC_VAR_HEIGHT: &'static Foo = &Foo {};
+ | -^^^^^^^---- help: consider removing `'static`: `&Foo`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:38:27
++ --> $DIR/redundant_static_lifetimes.rs:37:27
+ |
+LL | static STATIC_VAR_SLICE: &'static [u8] = b"Test static #3"; // ERROR Consider removing 'static.
+ | -^^^^^^^----- help: consider removing `'static`: `&[u8]`
+
+error: statics have by default a `'static` lifetime
- --> $DIR/redundant_static_lifetimes.rs:40:27
++ --> $DIR/redundant_static_lifetimes.rs:39:27
+ |
+LL | static STATIC_VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static.
+ | -^^^^^^^--------- help: consider removing `'static`: `&(u8, u8)`
+
+error: statics have by default a `'static` lifetime
- error: aborting due to 16 previous errors
++ --> $DIR/redundant_static_lifetimes.rs:41:27
+ |
+LL | static STATIC_VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static.
+ | -^^^^^^^-------- help: consider removing `'static`: `&[u8; 1]`
+
++error: statics have by default a `'static` lifetime
++ --> $DIR/redundant_static_lifetimes.rs:68:16
++ |
++LL | static V: &'static u8 = &17;
++ | -^^^^^^^--- help: consider removing `'static`: `&u8`
++
++error: aborting due to 17 previous errors
+
--- /dev/null
+#![allow(unused)]
+#![warn(clippy::ref_option_ref)]
+
+// This lint is not tagged as run-rustfix because automatically
+// changing the type of a variable would also means changing
+// all usages of this variable to match and This is not handled
+// by this lint.
+
+static THRESHOLD: i32 = 10;
+static REF_THRESHOLD: &Option<&i32> = &Some(&THRESHOLD);
+const CONST_THRESHOLD: &i32 = &10;
+const REF_CONST: &Option<&i32> = &Some(CONST_THRESHOLD);
+
+type RefOptRefU32<'a> = &'a Option<&'a u32>;
+type RefOptRef<'a, T> = &'a Option<&'a T>;
+
+fn foo(data: &Option<&u32>) {}
+
+fn bar(data: &u32) -> &Option<&u32> {
+ &None
+}
+
+struct StructRef<'a> {
+ data: &'a Option<&'a u32>,
+}
+
+struct StructTupleRef<'a>(u32, &'a Option<&'a u32>);
+
+enum EnumRef<'a> {
+ Variant1(u32),
+ Variant2(&'a Option<&'a u32>),
+}
+
+trait RefOptTrait {
+ type A;
+ fn foo(&self, _: Self::A);
+}
+
+impl RefOptTrait for u32 {
+ type A = &'static Option<&'static Self>;
+
+ fn foo(&self, _: Self::A) {}
+}
+
+fn main() {
+ let x: &Option<&u32> = &None;
+}
++
++fn issue9682(arg: &Option<&mut String>) {
++ // Should not lint, as the inner ref is mutable making it non `Copy`
++ println!("{arg:?}");
++}
--- /dev/null
+// aux-build:proc_macro_with_span.rs
+// run-rustfix
+#![feature(custom_inner_attributes)]
+#![warn(clippy::uninlined_format_args)]
+#![allow(named_arguments_used_positionally, unused_imports, unused_macros, unused_variables)]
+#![allow(clippy::eq_op, clippy::format_in_format_args, clippy::print_literal)]
+
+extern crate proc_macro_with_span;
+use proc_macro_with_span::with_span;
+
+macro_rules! no_param_str {
+ () => {
+ "{}"
+ };
+}
+
+macro_rules! my_println {
+ ($($args:tt),*) => {{
+ println!($($args),*)
+ }};
+}
+
+macro_rules! my_println_args {
+ ($($args:tt),*) => {{
+ println!("foo: {}", format_args!($($args),*))
+ }};
+}
+
+fn tester(fn_arg: i32) {
+ let local_i32 = 1;
+ let local_f64 = 2.0;
+ let local_opt: Option<i32> = Some(3);
+ let width = 4;
+ let prec = 5;
+ let val = 6;
+
+ // make sure this file hasn't been corrupted with tabs converted to spaces
+ // let _ = ' '; // <- this is a single tab character
+ let _: &[u8; 3] = b" "; // <- <tab><space><tab>
+
+ println!("val='{local_i32}'");
+ println!("val='{local_i32}'"); // 3 spaces
+ println!("val='{local_i32}'"); // tab
+ println!("val='{local_i32}'"); // space+tab
+ println!("val='{local_i32}'"); // tab+space
+ println!(
+ "val='{
+ }'",
+ local_i32
+ );
+ println!("{local_i32}");
+ println!("{fn_arg}");
+ println!("{local_i32:?}");
+ println!("{local_i32:#?}");
+ println!("{local_i32:4}");
+ println!("{local_i32:04}");
+ println!("{local_i32:<3}");
+ println!("{local_i32:#010x}");
+ println!("{local_f64:.1}");
+ println!("Hello {} is {local_f64:.local_i32$}", "x");
+ println!("Hello {local_i32} is {local_f64:.*}", 5);
+ println!("Hello {local_i32} is {local_f64:.*}", 5);
+ println!("{local_i32} {local_f64}");
+ println!("{local_i32}, {}", local_opt.unwrap());
+ println!("{val}");
+ println!("{val}");
+ println!("{} {1}", local_i32, 42);
+ println!("val='{local_i32}'");
+ println!("val='{local_i32}'");
+ println!("val='{local_i32}'");
+ println!("val='{fn_arg}'");
+ println!("{local_i32}");
+ println!("{local_i32:?}");
+ println!("{local_i32:#?}");
+ println!("{local_i32:04}");
+ println!("{local_i32:<3}");
+ println!("{local_i32:#010x}");
+ println!("{local_f64:.1}");
+ println!("{local_i32} {local_i32}");
+ println!("{local_f64} {local_i32} {local_i32} {local_f64}");
+ println!("{local_i32} {local_f64}");
+ println!("{local_f64} {local_i32}");
+ println!("{local_f64} {local_i32} {local_f64} {local_i32}");
+ println!("{1} {0}", "str", local_i32);
+ println!("{local_i32}");
+ println!("{local_i32:width$}");
+ println!("{local_i32:width$}");
+ println!("{local_i32:.prec$}");
+ println!("{local_i32:.prec$}");
+ println!("{val:val$}");
+ println!("{val:val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{val:val$.val$}");
+ println!("{width:width$}");
+ println!("{local_i32:width$}");
+ println!("{width:width$}");
+ println!("{local_i32:width$}");
+ println!("{prec:.prec$}");
+ println!("{local_i32:.prec$}");
+ println!("{prec:.prec$}");
+ println!("{local_i32:.prec$}");
+ println!("{width:width$.prec$}");
+ println!("{width:width$.prec$}");
+ println!("{local_f64:width$.prec$}");
+ println!("{local_f64:width$.prec$} {local_f64} {width} {prec}");
+ println!(
+ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}",
+ local_i32, width, prec,
+ );
+ println!(
+ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$} {3}",
+ local_i32,
+ width,
+ prec,
+ 1 + 2
+ );
+ println!("Width = {local_i32}, value with width = {local_f64:local_i32$}");
+ println!("{local_i32:width$.prec$}");
+ println!("{width:width$.prec$}");
+ println!("{}", format!("{local_i32}"));
+ my_println!("{}", local_i32);
+ my_println_args!("{}", local_i32);
+
+ // these should NOT be modified by the lint
+ println!(concat!("nope ", "{}"), local_i32);
+ println!("val='{local_i32}'");
+ println!("val='{local_i32 }'");
+ println!("val='{local_i32 }'"); // with tab
+ println!("val='{local_i32\n}'");
+ println!("{}", usize::MAX);
+ println!("{}", local_opt.unwrap());
+ println!(
+ "val='{local_i32
+ }'"
+ );
+ println!(no_param_str!(), local_i32);
+
+ println!(
+ "{}",
+ // comment with a comma , in it
+ val,
+ );
+ println!("{val}");
+
+ println!(with_span!("{0} {1}" "{1} {0}"), local_i32, local_f64);
+ println!("{}", with_span!(span val));
++
++ if local_i32 > 0 {
++ panic!("p1 {local_i32}");
++ }
++ if local_i32 > 0 {
++ panic!("p2 {local_i32}");
++ }
++ if local_i32 > 0 {
++ panic!("p3 {local_i32}");
++ }
++ if local_i32 > 0 {
++ panic!("p4 {local_i32}");
++ }
+}
+
+fn main() {
+ tester(42);
+}
+
+fn _under_msrv() {
+ #![clippy::msrv = "1.57"]
+ let local_i32 = 1;
+ println!("don't expand='{}'", local_i32);
+}
+
+fn _meets_msrv() {
+ #![clippy::msrv = "1.58"]
+ let local_i32 = 1;
+ println!("expand='{local_i32}'");
+}
--- /dev/null
+// aux-build:proc_macro_with_span.rs
+// run-rustfix
+#![feature(custom_inner_attributes)]
+#![warn(clippy::uninlined_format_args)]
+#![allow(named_arguments_used_positionally, unused_imports, unused_macros, unused_variables)]
+#![allow(clippy::eq_op, clippy::format_in_format_args, clippy::print_literal)]
+
+extern crate proc_macro_with_span;
+use proc_macro_with_span::with_span;
+
+macro_rules! no_param_str {
+ () => {
+ "{}"
+ };
+}
+
+macro_rules! my_println {
+ ($($args:tt),*) => {{
+ println!($($args),*)
+ }};
+}
+
+macro_rules! my_println_args {
+ ($($args:tt),*) => {{
+ println!("foo: {}", format_args!($($args),*))
+ }};
+}
+
+fn tester(fn_arg: i32) {
+ let local_i32 = 1;
+ let local_f64 = 2.0;
+ let local_opt: Option<i32> = Some(3);
+ let width = 4;
+ let prec = 5;
+ let val = 6;
+
+ // make sure this file hasn't been corrupted with tabs converted to spaces
+ // let _ = ' '; // <- this is a single tab character
+ let _: &[u8; 3] = b" "; // <- <tab><space><tab>
+
+ println!("val='{}'", local_i32);
+ println!("val='{ }'", local_i32); // 3 spaces
+ println!("val='{ }'", local_i32); // tab
+ println!("val='{ }'", local_i32); // space+tab
+ println!("val='{ }'", local_i32); // tab+space
+ println!(
+ "val='{
+ }'",
+ local_i32
+ );
+ println!("{}", local_i32);
+ println!("{}", fn_arg);
+ println!("{:?}", local_i32);
+ println!("{:#?}", local_i32);
+ println!("{:4}", local_i32);
+ println!("{:04}", local_i32);
+ println!("{:<3}", local_i32);
+ println!("{:#010x}", local_i32);
+ println!("{:.1}", local_f64);
+ println!("Hello {} is {:.*}", "x", local_i32, local_f64);
+ println!("Hello {} is {:.*}", local_i32, 5, local_f64);
+ println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
+ println!("{} {}", local_i32, local_f64);
+ println!("{}, {}", local_i32, local_opt.unwrap());
+ println!("{}", val);
+ println!("{}", v = val);
+ println!("{} {1}", local_i32, 42);
+ println!("val='{\t }'", local_i32);
+ println!("val='{\n }'", local_i32);
+ println!("val='{local_i32}'", local_i32 = local_i32);
+ println!("val='{local_i32}'", local_i32 = fn_arg);
+ println!("{0}", local_i32);
+ println!("{0:?}", local_i32);
+ println!("{0:#?}", local_i32);
+ println!("{0:04}", local_i32);
+ println!("{0:<3}", local_i32);
+ println!("{0:#010x}", local_i32);
+ println!("{0:.1}", local_f64);
+ println!("{0} {0}", local_i32);
+ println!("{1} {} {0} {}", local_i32, local_f64);
+ println!("{0} {1}", local_i32, local_f64);
+ println!("{1} {0}", local_i32, local_f64);
+ println!("{1} {0} {1} {0}", local_i32, local_f64);
+ println!("{1} {0}", "str", local_i32);
+ println!("{v}", v = local_i32);
+ println!("{local_i32:0$}", width);
+ println!("{local_i32:w$}", w = width);
+ println!("{local_i32:.0$}", prec);
+ println!("{local_i32:.p$}", p = prec);
+ println!("{:0$}", v = val);
+ println!("{0:0$}", v = val);
+ println!("{:0$.0$}", v = val);
+ println!("{0:0$.0$}", v = val);
+ println!("{0:0$.v$}", v = val);
+ println!("{0:v$.0$}", v = val);
+ println!("{v:0$.0$}", v = val);
+ println!("{v:v$.0$}", v = val);
+ println!("{v:0$.v$}", v = val);
+ println!("{v:v$.v$}", v = val);
+ println!("{:0$}", width);
+ println!("{:1$}", local_i32, width);
+ println!("{:w$}", w = width);
+ println!("{:w$}", local_i32, w = width);
+ println!("{:.0$}", prec);
+ println!("{:.1$}", local_i32, prec);
+ println!("{:.p$}", p = prec);
+ println!("{:.p$}", local_i32, p = prec);
+ println!("{:0$.1$}", width, prec);
+ println!("{:0$.w$}", width, w = prec);
+ println!("{:1$.2$}", local_f64, width, prec);
+ println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
+ println!(
+ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$}",
+ local_i32, width, prec,
+ );
+ println!(
+ "{0:1$.2$} {0:2$.1$} {1:0$.2$} {1:2$.0$} {2:0$.1$} {2:1$.0$} {3}",
+ local_i32,
+ width,
+ prec,
+ 1 + 2
+ );
+ println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
+ println!("{:w$.p$}", local_i32, w = width, p = prec);
+ println!("{:w$.p$}", w = width, p = prec);
+ println!("{}", format!("{}", local_i32));
+ my_println!("{}", local_i32);
+ my_println_args!("{}", local_i32);
+
+ // these should NOT be modified by the lint
+ println!(concat!("nope ", "{}"), local_i32);
+ println!("val='{local_i32}'");
+ println!("val='{local_i32 }'");
+ println!("val='{local_i32 }'"); // with tab
+ println!("val='{local_i32\n}'");
+ println!("{}", usize::MAX);
+ println!("{}", local_opt.unwrap());
+ println!(
+ "val='{local_i32
+ }'"
+ );
+ println!(no_param_str!(), local_i32);
+
+ println!(
+ "{}",
+ // comment with a comma , in it
+ val,
+ );
+ println!("{}", /* comment with a comma , in it */ val);
+
+ println!(with_span!("{0} {1}" "{1} {0}"), local_i32, local_f64);
+ println!("{}", with_span!(span val));
++
++ if local_i32 > 0 {
++ panic!("p1 {}", local_i32);
++ }
++ if local_i32 > 0 {
++ panic!("p2 {0}", local_i32);
++ }
++ if local_i32 > 0 {
++ panic!("p3 {local_i32}", local_i32 = local_i32);
++ }
++ if local_i32 > 0 {
++ panic!("p4 {local_i32}");
++ }
+}
+
+fn main() {
+ tester(42);
+}
+
+fn _under_msrv() {
+ #![clippy::msrv = "1.57"]
+ let local_i32 = 1;
+ println!("don't expand='{}'", local_i32);
+}
+
+fn _meets_msrv() {
+ #![clippy::msrv = "1.58"]
+ let local_i32 = 1;
+ println!("expand='{}'", local_i32);
+}
--- /dev/null
- --> $DIR/uninlined_format_args.rs:168:5
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:41:5
+ |
+LL | println!("val='{}'", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::uninlined-format-args` implied by `-D warnings`
+help: change this to
+ |
+LL - println!("val='{}'", local_i32);
+LL + println!("val='{local_i32}'");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:42:5
+ |
+LL | println!("val='{ }'", local_i32); // 3 spaces
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{ }'", local_i32); // 3 spaces
+LL + println!("val='{local_i32}'"); // 3 spaces
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:43:5
+ |
+LL | println!("val='{ }'", local_i32); // tab
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{ }'", local_i32); // tab
+LL + println!("val='{local_i32}'"); // tab
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:44:5
+ |
+LL | println!("val='{ }'", local_i32); // space+tab
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{ }'", local_i32); // space+tab
+LL + println!("val='{local_i32}'"); // space+tab
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:45:5
+ |
+LL | println!("val='{ }'", local_i32); // tab+space
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{ }'", local_i32); // tab+space
+LL + println!("val='{local_i32}'"); // tab+space
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:51:5
+ |
+LL | println!("{}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", local_i32);
+LL + println!("{local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:52:5
+ |
+LL | println!("{}", fn_arg);
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", fn_arg);
+LL + println!("{fn_arg}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:53:5
+ |
+LL | println!("{:?}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:?}", local_i32);
+LL + println!("{local_i32:?}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:54:5
+ |
+LL | println!("{:#?}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:#?}", local_i32);
+LL + println!("{local_i32:#?}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:55:5
+ |
+LL | println!("{:4}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:4}", local_i32);
+LL + println!("{local_i32:4}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:56:5
+ |
+LL | println!("{:04}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:04}", local_i32);
+LL + println!("{local_i32:04}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:57:5
+ |
+LL | println!("{:<3}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:<3}", local_i32);
+LL + println!("{local_i32:<3}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:58:5
+ |
+LL | println!("{:#010x}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:#010x}", local_i32);
+LL + println!("{local_i32:#010x}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:59:5
+ |
+LL | println!("{:.1}", local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:.1}", local_f64);
+LL + println!("{local_f64:.1}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:60:5
+ |
+LL | println!("Hello {} is {:.*}", "x", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("Hello {} is {:.*}", "x", local_i32, local_f64);
+LL + println!("Hello {} is {local_f64:.local_i32$}", "x");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:61:5
+ |
+LL | println!("Hello {} is {:.*}", local_i32, 5, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("Hello {} is {:.*}", local_i32, 5, local_f64);
+LL + println!("Hello {local_i32} is {local_f64:.*}", 5);
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:62:5
+ |
+LL | println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("Hello {} is {2:.*}", local_i32, 5, local_f64);
+LL + println!("Hello {local_i32} is {local_f64:.*}", 5);
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:63:5
+ |
+LL | println!("{} {}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{} {}", local_i32, local_f64);
+LL + println!("{local_i32} {local_f64}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:64:5
+ |
+LL | println!("{}, {}", local_i32, local_opt.unwrap());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}, {}", local_i32, local_opt.unwrap());
+LL + println!("{local_i32}, {}", local_opt.unwrap());
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:65:5
+ |
+LL | println!("{}", val);
+ | ^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", val);
+LL + println!("{val}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:66:5
+ |
+LL | println!("{}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", v = val);
+LL + println!("{val}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:68:5
+ |
+LL | println!("val='{/t }'", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{/t }'", local_i32);
+LL + println!("val='{local_i32}'");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:69:5
+ |
+LL | println!("val='{/n }'", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{/n }'", local_i32);
+LL + println!("val='{local_i32}'");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:70:5
+ |
+LL | println!("val='{local_i32}'", local_i32 = local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{local_i32}'", local_i32 = local_i32);
+LL + println!("val='{local_i32}'");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:71:5
+ |
+LL | println!("val='{local_i32}'", local_i32 = fn_arg);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("val='{local_i32}'", local_i32 = fn_arg);
+LL + println!("val='{fn_arg}'");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:72:5
+ |
+LL | println!("{0}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0}", local_i32);
+LL + println!("{local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:73:5
+ |
+LL | println!("{0:?}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:?}", local_i32);
+LL + println!("{local_i32:?}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:74:5
+ |
+LL | println!("{0:#?}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:#?}", local_i32);
+LL + println!("{local_i32:#?}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:75:5
+ |
+LL | println!("{0:04}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:04}", local_i32);
+LL + println!("{local_i32:04}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:76:5
+ |
+LL | println!("{0:<3}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:<3}", local_i32);
+LL + println!("{local_i32:<3}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:77:5
+ |
+LL | println!("{0:#010x}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:#010x}", local_i32);
+LL + println!("{local_i32:#010x}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:78:5
+ |
+LL | println!("{0:.1}", local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:.1}", local_f64);
+LL + println!("{local_f64:.1}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:79:5
+ |
+LL | println!("{0} {0}", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0} {0}", local_i32);
+LL + println!("{local_i32} {local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:80:5
+ |
+LL | println!("{1} {} {0} {}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{1} {} {0} {}", local_i32, local_f64);
+LL + println!("{local_f64} {local_i32} {local_i32} {local_f64}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:81:5
+ |
+LL | println!("{0} {1}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0} {1}", local_i32, local_f64);
+LL + println!("{local_i32} {local_f64}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:82:5
+ |
+LL | println!("{1} {0}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{1} {0}", local_i32, local_f64);
+LL + println!("{local_f64} {local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:83:5
+ |
+LL | println!("{1} {0} {1} {0}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{1} {0} {1} {0}", local_i32, local_f64);
+LL + println!("{local_f64} {local_i32} {local_f64} {local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:85:5
+ |
+LL | println!("{v}", v = local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{v}", v = local_i32);
+LL + println!("{local_i32}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:86:5
+ |
+LL | println!("{local_i32:0$}", width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{local_i32:0$}", width);
+LL + println!("{local_i32:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:87:5
+ |
+LL | println!("{local_i32:w$}", w = width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{local_i32:w$}", w = width);
+LL + println!("{local_i32:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:88:5
+ |
+LL | println!("{local_i32:.0$}", prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{local_i32:.0$}", prec);
+LL + println!("{local_i32:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:89:5
+ |
+LL | println!("{local_i32:.p$}", p = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{local_i32:.p$}", p = prec);
+LL + println!("{local_i32:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:90:5
+ |
+LL | println!("{:0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:0$}", v = val);
+LL + println!("{val:val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:91:5
+ |
+LL | println!("{0:0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:0$}", v = val);
+LL + println!("{val:val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:92:5
+ |
+LL | println!("{:0$.0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:0$.0$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:93:5
+ |
+LL | println!("{0:0$.0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:0$.0$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:94:5
+ |
+LL | println!("{0:0$.v$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:0$.v$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:95:5
+ |
+LL | println!("{0:v$.0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{0:v$.0$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:96:5
+ |
+LL | println!("{v:0$.0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{v:0$.0$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:97:5
+ |
+LL | println!("{v:v$.0$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{v:v$.0$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:98:5
+ |
+LL | println!("{v:0$.v$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{v:0$.v$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:99:5
+ |
+LL | println!("{v:v$.v$}", v = val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{v:v$.v$}", v = val);
+LL + println!("{val:val$.val$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:100:5
+ |
+LL | println!("{:0$}", width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:0$}", width);
+LL + println!("{width:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:101:5
+ |
+LL | println!("{:1$}", local_i32, width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:1$}", local_i32, width);
+LL + println!("{local_i32:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:102:5
+ |
+LL | println!("{:w$}", w = width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:w$}", w = width);
+LL + println!("{width:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:103:5
+ |
+LL | println!("{:w$}", local_i32, w = width);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:w$}", local_i32, w = width);
+LL + println!("{local_i32:width$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:104:5
+ |
+LL | println!("{:.0$}", prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:.0$}", prec);
+LL + println!("{prec:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:105:5
+ |
+LL | println!("{:.1$}", local_i32, prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:.1$}", local_i32, prec);
+LL + println!("{local_i32:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:106:5
+ |
+LL | println!("{:.p$}", p = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:.p$}", p = prec);
+LL + println!("{prec:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:107:5
+ |
+LL | println!("{:.p$}", local_i32, p = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:.p$}", local_i32, p = prec);
+LL + println!("{local_i32:.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:108:5
+ |
+LL | println!("{:0$.1$}", width, prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:0$.1$}", width, prec);
+LL + println!("{width:width$.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:109:5
+ |
+LL | println!("{:0$.w$}", width, w = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:0$.w$}", width, w = prec);
+LL + println!("{width:width$.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:110:5
+ |
+LL | println!("{:1$.2$}", local_f64, width, prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:1$.2$}", local_f64, width, prec);
+LL + println!("{local_f64:width$.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:111:5
+ |
+LL | println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:1$.2$} {0} {1} {2}", local_f64, width, prec);
+LL + println!("{local_f64:width$.prec$} {local_f64} {width} {prec}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:123:5
+ |
+LL | println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("Width = {}, value with width = {:0$}", local_i32, local_f64);
+LL + println!("Width = {local_i32}, value with width = {local_f64:local_i32$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:124:5
+ |
+LL | println!("{:w$.p$}", local_i32, w = width, p = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:w$.p$}", local_i32, w = width, p = prec);
+LL + println!("{local_i32:width$.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:125:5
+ |
+LL | println!("{:w$.p$}", w = width, p = prec);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{:w$.p$}", w = width, p = prec);
+LL + println!("{width:width$.prec$}");
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:126:20
+ |
+LL | println!("{}", format!("{}", local_i32));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", format!("{}", local_i32));
+LL + println!("{}", format!("{local_i32}"));
+ |
+
+error: variables can be used directly in the `format!` string
+ --> $DIR/uninlined_format_args.rs:149:5
+ |
+LL | println!("{}", /* comment with a comma , in it */ val);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("{}", /* comment with a comma , in it */ val);
+LL + println!("{val}");
+ |
+
+error: variables can be used directly in the `format!` string
- error: aborting due to 70 previous errors
++ --> $DIR/uninlined_format_args.rs:155:9
++ |
++LL | panic!("p1 {}", local_i32);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p1 {}", local_i32);
++LL + panic!("p1 {local_i32}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args.rs:158:9
++ |
++LL | panic!("p2 {0}", local_i32);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p2 {0}", local_i32);
++LL + panic!("p2 {local_i32}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args.rs:161:9
++ |
++LL | panic!("p3 {local_i32}", local_i32 = local_i32);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p3 {local_i32}", local_i32 = local_i32);
++LL + panic!("p3 {local_i32}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args.rs:181:5
+ |
+LL | println!("expand='{}'", local_i32);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: change this to
+ |
+LL - println!("expand='{}'", local_i32);
+LL + println!("expand='{local_i32}'");
+ |
+
++error: aborting due to 73 previous errors
+
--- /dev/null
--- /dev/null
++// revisions: edition2018 edition2021
++//[edition2018] edition:2018
++//[edition2021] edition:2021
++// run-rustfix
++
++#![warn(clippy::uninlined_format_args)]
++
++fn main() {
++ let var = 1;
++
++ println!("val='{var}'");
++
++ if var > 0 {
++ panic!("p1 {}", var);
++ }
++ if var > 0 {
++ panic!("p2 {0}", var);
++ }
++ if var > 0 {
++ panic!("p3 {var}", var = var);
++ }
++
++ #[allow(non_fmt_panics)]
++ {
++ if var > 0 {
++ panic!("p4 {var}");
++ }
++ }
++}
--- /dev/null
--- /dev/null
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:11:5
++ |
++LL | println!("val='{}'", var);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::uninlined-format-args` implied by `-D warnings`
++help: change this to
++ |
++LL - println!("val='{}'", var);
++LL + println!("val='{var}'");
++ |
++
++error: aborting due to previous error
++
--- /dev/null
--- /dev/null
++// revisions: edition2018 edition2021
++//[edition2018] edition:2018
++//[edition2021] edition:2021
++// run-rustfix
++
++#![warn(clippy::uninlined_format_args)]
++
++fn main() {
++ let var = 1;
++
++ println!("val='{var}'");
++
++ if var > 0 {
++ panic!("p1 {var}");
++ }
++ if var > 0 {
++ panic!("p2 {var}");
++ }
++ if var > 0 {
++ panic!("p3 {var}");
++ }
++
++ #[allow(non_fmt_panics)]
++ {
++ if var > 0 {
++ panic!("p4 {var}");
++ }
++ }
++}
--- /dev/null
--- /dev/null
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:11:5
++ |
++LL | println!("val='{}'", var);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::uninlined-format-args` implied by `-D warnings`
++help: change this to
++ |
++LL - println!("val='{}'", var);
++LL + println!("val='{var}'");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:14:9
++ |
++LL | panic!("p1 {}", var);
++ | ^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p1 {}", var);
++LL + panic!("p1 {var}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:17:9
++ |
++LL | panic!("p2 {0}", var);
++ | ^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p2 {0}", var);
++LL + panic!("p2 {var}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:20:9
++ |
++LL | panic!("p3 {var}", var = var);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - panic!("p3 {var}", var = var);
++LL + panic!("p3 {var}");
++ |
++
++error: aborting due to 4 previous errors
++
--- /dev/null
--- /dev/null
++// revisions: edition2018 edition2021
++//[edition2018] edition:2018
++//[edition2021] edition:2021
++// run-rustfix
++
++#![warn(clippy::uninlined_format_args)]
++
++fn main() {
++ let var = 1;
++
++ println!("val='{}'", var);
++
++ if var > 0 {
++ panic!("p1 {}", var);
++ }
++ if var > 0 {
++ panic!("p2 {0}", var);
++ }
++ if var > 0 {
++ panic!("p3 {var}", var = var);
++ }
++
++ #[allow(non_fmt_panics)]
++ {
++ if var > 0 {
++ panic!("p4 {var}");
++ }
++ }
++}
--- /dev/null
+// run-rustfix
+#![warn(clippy::unnecessary_cast)]
+#![allow(
+ unused_must_use,
+ clippy::borrow_as_ptr,
+ clippy::no_effect,
+ clippy::nonstandard_macro_braces,
+ clippy::unnecessary_operation
+)]
+
+#[rustfmt::skip]
+fn main() {
+ // Test cast_unnecessary
+ 1_i32;
+ 1_f32;
+ false;
+ &1i32 as &i32;
+
+ -1_i32;
+ - 1_i32;
+ -1_f32;
+ 1_i32;
+ 1_f32;
+
+ // macro version
+ macro_rules! foo {
+ ($a:ident, $b:ident) => {
+ #[allow(unused)]
+ pub fn $a() -> $b {
+ 1 as $b
+ }
+ };
+ }
+ foo!(a, i32);
+ foo!(b, f32);
+ foo!(c, f64);
+
+ // do not lint cast to cfg-dependant type
+ 1 as std::os::raw::c_char;
+
+ // do not lint cast to alias type
+ 1 as I32Alias;
+ &1 as &I32Alias;
+}
+
+type I32Alias = i32;
+
+mod fixable {
+ #![allow(dead_code)]
+
+ fn main() {
+ // casting integer literal to float is unnecessary
+ 100_f32;
+ 100_f64;
+ 100_f64;
+ let _ = -100_f32;
+ let _ = -100_f64;
+ let _ = -100_f64;
+ 100_f32;
+ 100_f64;
+ // Should not trigger
+ #[rustfmt::skip]
+ let v = vec!(1);
+ &v as &[i32];
+ 0x10 as f32;
+ 0o10 as f32;
+ 0b10 as f32;
+ 0x11 as f64;
+ 0o11 as f64;
+ 0b11 as f64;
+
+ 1_u32;
+ 0x10_i32;
+ 0b10_usize;
+ 0o73_u16;
+ 1_000_000_000_u32;
+
+ 1.0_f64;
+ 0.5_f32;
+
+ 1.0 as u16;
+
+ let _ = -1_i32;
+ let _ = -1.0_f32;
+
+ let _ = 1 as I32Alias;
+ let _ = &1 as &I32Alias;
+ }
+
+ type I32Alias = i32;
+
+ fn issue_9380() {
+ let _: i32 = -1_i32;
+ let _: f32 = -(1) as f32;
+ let _: i64 = -1_i64;
+ let _: i64 = -(1.0) as i64;
+
+ let _ = -(1 + 1) as i64;
+ }
+
+ fn issue_9563() {
+ let _: f64 = (-8.0_f64).exp();
+ #[allow(clippy::precedence)]
+ let _: f64 = -8.0_f64.exp(); // should suggest `-8.0_f64.exp()` here not to change code behavior
+ }
+
+ fn issue_9562_non_literal() {
+ fn foo() -> f32 {
+ 0.
+ }
+
+ let _num = foo();
+ }
++
++ fn issue_9603() {
++ let _: f32 = -0x400 as f32;
++ }
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::unnecessary_cast)]
+#![allow(
+ unused_must_use,
+ clippy::borrow_as_ptr,
+ clippy::no_effect,
+ clippy::nonstandard_macro_braces,
+ clippy::unnecessary_operation
+)]
+
+#[rustfmt::skip]
+fn main() {
+ // Test cast_unnecessary
+ 1i32 as i32;
+ 1f32 as f32;
+ false as bool;
+ &1i32 as &i32;
+
+ -1_i32 as i32;
+ - 1_i32 as i32;
+ -1f32 as f32;
+ 1_i32 as i32;
+ 1_f32 as f32;
+
+ // macro version
+ macro_rules! foo {
+ ($a:ident, $b:ident) => {
+ #[allow(unused)]
+ pub fn $a() -> $b {
+ 1 as $b
+ }
+ };
+ }
+ foo!(a, i32);
+ foo!(b, f32);
+ foo!(c, f64);
+
+ // do not lint cast to cfg-dependant type
+ 1 as std::os::raw::c_char;
+
+ // do not lint cast to alias type
+ 1 as I32Alias;
+ &1 as &I32Alias;
+}
+
+type I32Alias = i32;
+
+mod fixable {
+ #![allow(dead_code)]
+
+ fn main() {
+ // casting integer literal to float is unnecessary
+ 100 as f32;
+ 100 as f64;
+ 100_i32 as f64;
+ let _ = -100 as f32;
+ let _ = -100 as f64;
+ let _ = -100_i32 as f64;
+ 100. as f32;
+ 100. as f64;
+ // Should not trigger
+ #[rustfmt::skip]
+ let v = vec!(1);
+ &v as &[i32];
+ 0x10 as f32;
+ 0o10 as f32;
+ 0b10 as f32;
+ 0x11 as f64;
+ 0o11 as f64;
+ 0b11 as f64;
+
+ 1 as u32;
+ 0x10 as i32;
+ 0b10 as usize;
+ 0o73 as u16;
+ 1_000_000_000 as u32;
+
+ 1.0 as f64;
+ 0.5 as f32;
+
+ 1.0 as u16;
+
+ let _ = -1 as i32;
+ let _ = -1.0 as f32;
+
+ let _ = 1 as I32Alias;
+ let _ = &1 as &I32Alias;
+ }
+
+ type I32Alias = i32;
+
+ fn issue_9380() {
+ let _: i32 = -(1) as i32;
+ let _: f32 = -(1) as f32;
+ let _: i64 = -(1) as i64;
+ let _: i64 = -(1.0) as i64;
+
+ let _ = -(1 + 1) as i64;
+ }
+
+ fn issue_9563() {
+ let _: f64 = (-8.0 as f64).exp();
+ #[allow(clippy::precedence)]
+ let _: f64 = -(8.0 as f64).exp(); // should suggest `-8.0_f64.exp()` here not to change code behavior
+ }
+
+ fn issue_9562_non_literal() {
+ fn foo() -> f32 {
+ 0.
+ }
+
+ let _num = foo() as f32;
+ }
++
++ fn issue_9603() {
++ let _: f32 = -0x400 as f32;
++ }
+}
--- /dev/null
- #![allow(clippy::ptr_arg)]
+// run-rustfix
+
++#![allow(clippy::needless_borrow, clippy::ptr_arg)]
+#![warn(clippy::unnecessary_to_owned)]
+#![feature(custom_inner_attributes)]
+
+use std::borrow::Cow;
+use std::ffi::{CStr, CString, OsStr, OsString};
+use std::ops::Deref;
+
+#[derive(Clone)]
+struct X(String);
+
+impl Deref for X {
+ type Target = [u8];
+ fn deref(&self) -> &[u8] {
+ self.0.as_bytes()
+ }
+}
+
+impl AsRef<str> for X {
+ fn as_ref(&self) -> &str {
+ self.0.as_str()
+ }
+}
+
+impl ToString for X {
+ fn to_string(&self) -> String {
+ self.0.to_string()
+ }
+}
+
+impl X {
+ fn join(&self, other: impl AsRef<str>) -> Self {
+ let mut s = self.0.clone();
+ s.push_str(other.as_ref());
+ Self(s)
+ }
+}
+
+#[allow(dead_code)]
+#[derive(Clone)]
+enum FileType {
+ Account,
+ PrivateKey,
+ Certificate,
+}
+
+fn main() {
+ let c_str = CStr::from_bytes_with_nul(&[0]).unwrap();
+ let os_str = OsStr::new("x");
+ let path = std::path::Path::new("x");
+ let s = "x";
+ let array = ["x"];
+ let array_ref = &["x"];
+ let slice = &["x"][..];
+ let x = X(String::from("x"));
+ let x_ref = &x;
+
+ require_c_str(&Cow::from(c_str));
+ require_c_str(c_str);
+
+ require_os_str(os_str);
+ require_os_str(&Cow::from(os_str));
+ require_os_str(os_str);
+
+ require_path(path);
+ require_path(&Cow::from(path));
+ require_path(path);
+
+ require_str(s);
+ require_str(&Cow::from(s));
+ require_str(s);
+ require_str(x_ref.as_ref());
+
+ require_slice(slice);
+ require_slice(&Cow::from(slice));
+ require_slice(array.as_ref());
+ require_slice(array_ref.as_ref());
+ require_slice(slice);
+ require_slice(&x_ref.to_owned()); // No longer flagged because of #8759.
+
+ require_x(&Cow::<X>::Owned(x.clone()));
+ require_x(&x_ref.to_owned()); // No longer flagged because of #8759.
+
+ require_deref_c_str(c_str);
+ require_deref_os_str(os_str);
+ require_deref_path(path);
+ require_deref_str(s);
+ require_deref_slice(slice);
+
+ require_impl_deref_c_str(c_str);
+ require_impl_deref_os_str(os_str);
+ require_impl_deref_path(path);
+ require_impl_deref_str(s);
+ require_impl_deref_slice(slice);
+
+ require_deref_str_slice(s, slice);
+ require_deref_slice_str(slice, s);
+
+ require_as_ref_c_str(c_str);
+ require_as_ref_os_str(os_str);
+ require_as_ref_path(path);
+ require_as_ref_str(s);
+ require_as_ref_str(&x);
+ require_as_ref_slice(array);
+ require_as_ref_slice(array_ref);
+ require_as_ref_slice(slice);
+
+ require_impl_as_ref_c_str(c_str);
+ require_impl_as_ref_os_str(os_str);
+ require_impl_as_ref_path(path);
+ require_impl_as_ref_str(s);
+ require_impl_as_ref_str(&x);
+ require_impl_as_ref_slice(array);
+ require_impl_as_ref_slice(array_ref);
+ require_impl_as_ref_slice(slice);
+
+ require_as_ref_str_slice(s, array);
+ require_as_ref_str_slice(s, array_ref);
+ require_as_ref_str_slice(s, slice);
+ require_as_ref_slice_str(array, s);
+ require_as_ref_slice_str(array_ref, s);
+ require_as_ref_slice_str(slice, s);
+
+ let _ = x.join(x_ref);
+
+ let _ = slice.iter().copied();
+ let _ = slice.iter().copied();
+ let _ = [std::path::PathBuf::new()][..].iter().cloned();
+ let _ = [std::path::PathBuf::new()][..].iter().cloned();
+
+ let _ = slice.iter().copied();
+ let _ = slice.iter().copied();
+ let _ = [std::path::PathBuf::new()][..].iter().cloned();
+ let _ = [std::path::PathBuf::new()][..].iter().cloned();
+
+ let _ = check_files(&[FileType::Account]);
+
+ // negative tests
+ require_string(&s.to_string());
+ require_string(&Cow::from(s).into_owned());
+ require_string(&s.to_owned());
+ require_string(&x_ref.to_string());
+
+ // `X` isn't copy.
+ require_slice(&x.to_owned());
+ require_deref_slice(x.to_owned());
+
+ // The following should be flagged by `redundant_clone`, but not by this lint.
+ require_c_str(&CString::from_vec_with_nul(vec![0]).unwrap());
+ require_os_str(&OsString::from("x"));
+ require_path(&std::path::PathBuf::from("x"));
+ require_str(&String::from("x"));
+ require_slice(&[String::from("x")]);
+}
+
+fn require_c_str(_: &CStr) {}
+fn require_os_str(_: &OsStr) {}
+fn require_path(_: &std::path::Path) {}
+fn require_str(_: &str) {}
+fn require_slice<T>(_: &[T]) {}
+fn require_x(_: &X) {}
+
+fn require_deref_c_str<T: Deref<Target = CStr>>(_: T) {}
+fn require_deref_os_str<T: Deref<Target = OsStr>>(_: T) {}
+fn require_deref_path<T: Deref<Target = std::path::Path>>(_: T) {}
+fn require_deref_str<T: Deref<Target = str>>(_: T) {}
+fn require_deref_slice<T, U: Deref<Target = [T]>>(_: U) {}
+
+fn require_impl_deref_c_str(_: impl Deref<Target = CStr>) {}
+fn require_impl_deref_os_str(_: impl Deref<Target = OsStr>) {}
+fn require_impl_deref_path(_: impl Deref<Target = std::path::Path>) {}
+fn require_impl_deref_str(_: impl Deref<Target = str>) {}
+fn require_impl_deref_slice<T>(_: impl Deref<Target = [T]>) {}
+
+fn require_deref_str_slice<T: Deref<Target = str>, U, V: Deref<Target = [U]>>(_: T, _: V) {}
+fn require_deref_slice_str<T, U: Deref<Target = [T]>, V: Deref<Target = str>>(_: U, _: V) {}
+
+fn require_as_ref_c_str<T: AsRef<CStr>>(_: T) {}
+fn require_as_ref_os_str<T: AsRef<OsStr>>(_: T) {}
+fn require_as_ref_path<T: AsRef<std::path::Path>>(_: T) {}
+fn require_as_ref_str<T: AsRef<str>>(_: T) {}
+fn require_as_ref_slice<T, U: AsRef<[T]>>(_: U) {}
+
+fn require_impl_as_ref_c_str(_: impl AsRef<CStr>) {}
+fn require_impl_as_ref_os_str(_: impl AsRef<OsStr>) {}
+fn require_impl_as_ref_path(_: impl AsRef<std::path::Path>) {}
+fn require_impl_as_ref_str(_: impl AsRef<str>) {}
+fn require_impl_as_ref_slice<T>(_: impl AsRef<[T]>) {}
+
+fn require_as_ref_str_slice<T: AsRef<str>, U, V: AsRef<[U]>>(_: T, _: V) {}
+fn require_as_ref_slice_str<T, U: AsRef<[T]>, V: AsRef<str>>(_: U, _: V) {}
+
+// `check_files` is based on:
+// https://github.com/breard-r/acmed/blob/1f0dcc32aadbc5e52de6d23b9703554c0f925113/acmed/src/storage.rs#L262
+fn check_files(file_types: &[FileType]) -> bool {
+ for t in file_types {
+ let path = match get_file_path(t) {
+ Ok(p) => p,
+ Err(_) => {
+ return false;
+ },
+ };
+ if !path.is_file() {
+ return false;
+ }
+ }
+ true
+}
+
+fn get_file_path(_file_type: &FileType) -> Result<std::path::PathBuf, std::io::Error> {
+ Ok(std::path::PathBuf::new())
+}
+
+fn require_string(_: &String) {}
+
+fn _msrv_1_35() {
+ #![clippy::msrv = "1.35"]
+ // `copied` was stabilized in 1.36, so clippy should use `cloned`.
+ let _ = &["x"][..].iter().cloned();
+}
+
+fn _msrv_1_36() {
+ #![clippy::msrv = "1.36"]
+ let _ = &["x"][..].iter().copied();
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8507
+mod issue_8507 {
+ #![allow(dead_code)]
+
+ struct Opaque<P>(P);
+
+ pub trait Abstracted {}
+
+ impl<P> Abstracted for Opaque<P> {}
+
+ fn build<P>(p: P) -> Opaque<P>
+ where
+ P: AsRef<str>,
+ {
+ Opaque(p)
+ }
+
+ // Should not lint.
+ fn test_str(s: &str) -> Box<dyn Abstracted> {
+ Box::new(build(s.to_string()))
+ }
+
+ // Should not lint.
+ fn test_x(x: super::X) -> Box<dyn Abstracted> {
+ Box::new(build(x))
+ }
+
+ #[derive(Clone, Copy)]
+ struct Y(&'static str);
+
+ impl AsRef<str> for Y {
+ fn as_ref(&self) -> &str {
+ self.0
+ }
+ }
+
+ impl ToString for Y {
+ fn to_string(&self) -> String {
+ self.0.to_string()
+ }
+ }
+
+ // Should lint because Y is copy.
+ fn test_y(y: Y) -> Box<dyn Abstracted> {
+ Box::new(build(y))
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8759
+mod issue_8759 {
+ #![allow(dead_code)]
+
+ #[derive(Default)]
+ struct View {}
+
+ impl std::borrow::ToOwned for View {
+ type Owned = View;
+ fn to_owned(&self) -> Self::Owned {
+ View {}
+ }
+ }
+
+ #[derive(Default)]
+ struct RenderWindow {
+ default_view: View,
+ }
+
+ impl RenderWindow {
+ fn default_view(&self) -> &View {
+ &self.default_view
+ }
+ fn set_view(&mut self, _view: &View) {}
+ }
+
+ fn main() {
+ let mut rw = RenderWindow::default();
+ rw.set_view(&rw.default_view().to_owned());
+ }
+}
+
+mod issue_8759_variant {
+ #![allow(dead_code)]
+
+ #[derive(Clone, Default)]
+ struct View {}
+
+ #[derive(Default)]
+ struct RenderWindow {
+ default_view: View,
+ }
+
+ impl RenderWindow {
+ fn default_view(&self) -> &View {
+ &self.default_view
+ }
+ fn set_view(&mut self, _view: &View) {}
+ }
+
+ fn main() {
+ let mut rw = RenderWindow::default();
+ rw.set_view(&rw.default_view().to_owned());
+ }
+}
+
+mod issue_9317 {
+ #![allow(dead_code)]
+
+ struct Bytes {}
+
+ impl ToString for Bytes {
+ fn to_string(&self) -> String {
+ "123".to_string()
+ }
+ }
+
+ impl AsRef<[u8]> for Bytes {
+ fn as_ref(&self) -> &[u8] {
+ &[1, 2, 3]
+ }
+ }
+
+ fn consume<C: AsRef<[u8]>>(c: C) {
+ let _ = c;
+ }
+
+ pub fn main() {
+ let b = Bytes {};
+ // Should not lint.
+ consume(b.to_string());
+ }
+}
+
+mod issue_9351 {
+ #![allow(dead_code)]
+
+ use std::ops::Deref;
+ use std::path::{Path, PathBuf};
+
+ fn require_deref_path<T: Deref<Target = std::path::Path>>(x: T) -> T {
+ x
+ }
+
+ fn generic_arg_used_elsewhere<T: AsRef<Path>>(_x: T, _y: T) {}
+
+ fn id<T: AsRef<str>>(x: T) -> T {
+ x
+ }
+
+ fn predicates_are_satisfied(_x: impl std::fmt::Write) {}
+
+ // Should lint
+ fn single_return() -> impl AsRef<str> {
+ id("abc")
+ }
+
+ // Should not lint
+ fn multiple_returns(b: bool) -> impl AsRef<str> {
+ if b {
+ return String::new();
+ }
+
+ id("abc".to_string())
+ }
+
+ struct S1(String);
+
+ // Should not lint
+ fn fields1() -> S1 {
+ S1(id("abc".to_string()))
+ }
+
+ struct S2 {
+ s: String,
+ }
+
+ // Should not lint
+ fn fields2() {
+ let mut s = S2 { s: "abc".into() };
+ s.s = id("abc".to_string());
+ }
+
+ pub fn main() {
+ let path = std::path::Path::new("x");
+ let path_buf = path.to_owned();
+
+ // Should not lint.
+ let _x: PathBuf = require_deref_path(path.to_owned());
+ generic_arg_used_elsewhere(path.to_owned(), path_buf);
+ predicates_are_satisfied(id("abc".to_string()));
+ }
+}
+
+mod issue_9504 {
+ #![allow(dead_code)]
+
+ async fn foo<S: AsRef<str>>(_: S) {}
+ async fn bar() {
+ foo(std::path::PathBuf::new().to_string_lossy().to_string()).await;
+ }
+}
--- /dev/null
- #![allow(clippy::ptr_arg)]
+// run-rustfix
+
++#![allow(clippy::needless_borrow, clippy::ptr_arg)]
+#![warn(clippy::unnecessary_to_owned)]
+#![feature(custom_inner_attributes)]
+
+use std::borrow::Cow;
+use std::ffi::{CStr, CString, OsStr, OsString};
+use std::ops::Deref;
+
+#[derive(Clone)]
+struct X(String);
+
+impl Deref for X {
+ type Target = [u8];
+ fn deref(&self) -> &[u8] {
+ self.0.as_bytes()
+ }
+}
+
+impl AsRef<str> for X {
+ fn as_ref(&self) -> &str {
+ self.0.as_str()
+ }
+}
+
+impl ToString for X {
+ fn to_string(&self) -> String {
+ self.0.to_string()
+ }
+}
+
+impl X {
+ fn join(&self, other: impl AsRef<str>) -> Self {
+ let mut s = self.0.clone();
+ s.push_str(other.as_ref());
+ Self(s)
+ }
+}
+
+#[allow(dead_code)]
+#[derive(Clone)]
+enum FileType {
+ Account,
+ PrivateKey,
+ Certificate,
+}
+
+fn main() {
+ let c_str = CStr::from_bytes_with_nul(&[0]).unwrap();
+ let os_str = OsStr::new("x");
+ let path = std::path::Path::new("x");
+ let s = "x";
+ let array = ["x"];
+ let array_ref = &["x"];
+ let slice = &["x"][..];
+ let x = X(String::from("x"));
+ let x_ref = &x;
+
+ require_c_str(&Cow::from(c_str).into_owned());
+ require_c_str(&c_str.to_owned());
+
+ require_os_str(&os_str.to_os_string());
+ require_os_str(&Cow::from(os_str).into_owned());
+ require_os_str(&os_str.to_owned());
+
+ require_path(&path.to_path_buf());
+ require_path(&Cow::from(path).into_owned());
+ require_path(&path.to_owned());
+
+ require_str(&s.to_string());
+ require_str(&Cow::from(s).into_owned());
+ require_str(&s.to_owned());
+ require_str(&x_ref.to_string());
+
+ require_slice(&slice.to_vec());
+ require_slice(&Cow::from(slice).into_owned());
+ require_slice(&array.to_owned());
+ require_slice(&array_ref.to_owned());
+ require_slice(&slice.to_owned());
+ require_slice(&x_ref.to_owned()); // No longer flagged because of #8759.
+
+ require_x(&Cow::<X>::Owned(x.clone()).into_owned());
+ require_x(&x_ref.to_owned()); // No longer flagged because of #8759.
+
+ require_deref_c_str(c_str.to_owned());
+ require_deref_os_str(os_str.to_owned());
+ require_deref_path(path.to_owned());
+ require_deref_str(s.to_owned());
+ require_deref_slice(slice.to_owned());
+
+ require_impl_deref_c_str(c_str.to_owned());
+ require_impl_deref_os_str(os_str.to_owned());
+ require_impl_deref_path(path.to_owned());
+ require_impl_deref_str(s.to_owned());
+ require_impl_deref_slice(slice.to_owned());
+
+ require_deref_str_slice(s.to_owned(), slice.to_owned());
+ require_deref_slice_str(slice.to_owned(), s.to_owned());
+
+ require_as_ref_c_str(c_str.to_owned());
+ require_as_ref_os_str(os_str.to_owned());
+ require_as_ref_path(path.to_owned());
+ require_as_ref_str(s.to_owned());
+ require_as_ref_str(x.to_owned());
+ require_as_ref_slice(array.to_owned());
+ require_as_ref_slice(array_ref.to_owned());
+ require_as_ref_slice(slice.to_owned());
+
+ require_impl_as_ref_c_str(c_str.to_owned());
+ require_impl_as_ref_os_str(os_str.to_owned());
+ require_impl_as_ref_path(path.to_owned());
+ require_impl_as_ref_str(s.to_owned());
+ require_impl_as_ref_str(x.to_owned());
+ require_impl_as_ref_slice(array.to_owned());
+ require_impl_as_ref_slice(array_ref.to_owned());
+ require_impl_as_ref_slice(slice.to_owned());
+
+ require_as_ref_str_slice(s.to_owned(), array.to_owned());
+ require_as_ref_str_slice(s.to_owned(), array_ref.to_owned());
+ require_as_ref_str_slice(s.to_owned(), slice.to_owned());
+ require_as_ref_slice_str(array.to_owned(), s.to_owned());
+ require_as_ref_slice_str(array_ref.to_owned(), s.to_owned());
+ require_as_ref_slice_str(slice.to_owned(), s.to_owned());
+
+ let _ = x.join(&x_ref.to_string());
+
+ let _ = slice.to_vec().into_iter();
+ let _ = slice.to_owned().into_iter();
+ let _ = [std::path::PathBuf::new()][..].to_vec().into_iter();
+ let _ = [std::path::PathBuf::new()][..].to_owned().into_iter();
+
+ let _ = IntoIterator::into_iter(slice.to_vec());
+ let _ = IntoIterator::into_iter(slice.to_owned());
+ let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_vec());
+ let _ = IntoIterator::into_iter([std::path::PathBuf::new()][..].to_owned());
+
+ let _ = check_files(&[FileType::Account]);
+
+ // negative tests
+ require_string(&s.to_string());
+ require_string(&Cow::from(s).into_owned());
+ require_string(&s.to_owned());
+ require_string(&x_ref.to_string());
+
+ // `X` isn't copy.
+ require_slice(&x.to_owned());
+ require_deref_slice(x.to_owned());
+
+ // The following should be flagged by `redundant_clone`, but not by this lint.
+ require_c_str(&CString::from_vec_with_nul(vec![0]).unwrap().to_owned());
+ require_os_str(&OsString::from("x").to_os_string());
+ require_path(&std::path::PathBuf::from("x").to_path_buf());
+ require_str(&String::from("x").to_string());
+ require_slice(&[String::from("x")].to_owned());
+}
+
+fn require_c_str(_: &CStr) {}
+fn require_os_str(_: &OsStr) {}
+fn require_path(_: &std::path::Path) {}
+fn require_str(_: &str) {}
+fn require_slice<T>(_: &[T]) {}
+fn require_x(_: &X) {}
+
+fn require_deref_c_str<T: Deref<Target = CStr>>(_: T) {}
+fn require_deref_os_str<T: Deref<Target = OsStr>>(_: T) {}
+fn require_deref_path<T: Deref<Target = std::path::Path>>(_: T) {}
+fn require_deref_str<T: Deref<Target = str>>(_: T) {}
+fn require_deref_slice<T, U: Deref<Target = [T]>>(_: U) {}
+
+fn require_impl_deref_c_str(_: impl Deref<Target = CStr>) {}
+fn require_impl_deref_os_str(_: impl Deref<Target = OsStr>) {}
+fn require_impl_deref_path(_: impl Deref<Target = std::path::Path>) {}
+fn require_impl_deref_str(_: impl Deref<Target = str>) {}
+fn require_impl_deref_slice<T>(_: impl Deref<Target = [T]>) {}
+
+fn require_deref_str_slice<T: Deref<Target = str>, U, V: Deref<Target = [U]>>(_: T, _: V) {}
+fn require_deref_slice_str<T, U: Deref<Target = [T]>, V: Deref<Target = str>>(_: U, _: V) {}
+
+fn require_as_ref_c_str<T: AsRef<CStr>>(_: T) {}
+fn require_as_ref_os_str<T: AsRef<OsStr>>(_: T) {}
+fn require_as_ref_path<T: AsRef<std::path::Path>>(_: T) {}
+fn require_as_ref_str<T: AsRef<str>>(_: T) {}
+fn require_as_ref_slice<T, U: AsRef<[T]>>(_: U) {}
+
+fn require_impl_as_ref_c_str(_: impl AsRef<CStr>) {}
+fn require_impl_as_ref_os_str(_: impl AsRef<OsStr>) {}
+fn require_impl_as_ref_path(_: impl AsRef<std::path::Path>) {}
+fn require_impl_as_ref_str(_: impl AsRef<str>) {}
+fn require_impl_as_ref_slice<T>(_: impl AsRef<[T]>) {}
+
+fn require_as_ref_str_slice<T: AsRef<str>, U, V: AsRef<[U]>>(_: T, _: V) {}
+fn require_as_ref_slice_str<T, U: AsRef<[T]>, V: AsRef<str>>(_: U, _: V) {}
+
+// `check_files` is based on:
+// https://github.com/breard-r/acmed/blob/1f0dcc32aadbc5e52de6d23b9703554c0f925113/acmed/src/storage.rs#L262
+fn check_files(file_types: &[FileType]) -> bool {
+ for t in file_types.to_vec() {
+ let path = match get_file_path(&t) {
+ Ok(p) => p,
+ Err(_) => {
+ return false;
+ },
+ };
+ if !path.is_file() {
+ return false;
+ }
+ }
+ true
+}
+
+fn get_file_path(_file_type: &FileType) -> Result<std::path::PathBuf, std::io::Error> {
+ Ok(std::path::PathBuf::new())
+}
+
+fn require_string(_: &String) {}
+
+fn _msrv_1_35() {
+ #![clippy::msrv = "1.35"]
+ // `copied` was stabilized in 1.36, so clippy should use `cloned`.
+ let _ = &["x"][..].to_vec().into_iter();
+}
+
+fn _msrv_1_36() {
+ #![clippy::msrv = "1.36"]
+ let _ = &["x"][..].to_vec().into_iter();
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8507
+mod issue_8507 {
+ #![allow(dead_code)]
+
+ struct Opaque<P>(P);
+
+ pub trait Abstracted {}
+
+ impl<P> Abstracted for Opaque<P> {}
+
+ fn build<P>(p: P) -> Opaque<P>
+ where
+ P: AsRef<str>,
+ {
+ Opaque(p)
+ }
+
+ // Should not lint.
+ fn test_str(s: &str) -> Box<dyn Abstracted> {
+ Box::new(build(s.to_string()))
+ }
+
+ // Should not lint.
+ fn test_x(x: super::X) -> Box<dyn Abstracted> {
+ Box::new(build(x))
+ }
+
+ #[derive(Clone, Copy)]
+ struct Y(&'static str);
+
+ impl AsRef<str> for Y {
+ fn as_ref(&self) -> &str {
+ self.0
+ }
+ }
+
+ impl ToString for Y {
+ fn to_string(&self) -> String {
+ self.0.to_string()
+ }
+ }
+
+ // Should lint because Y is copy.
+ fn test_y(y: Y) -> Box<dyn Abstracted> {
+ Box::new(build(y.to_string()))
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8759
+mod issue_8759 {
+ #![allow(dead_code)]
+
+ #[derive(Default)]
+ struct View {}
+
+ impl std::borrow::ToOwned for View {
+ type Owned = View;
+ fn to_owned(&self) -> Self::Owned {
+ View {}
+ }
+ }
+
+ #[derive(Default)]
+ struct RenderWindow {
+ default_view: View,
+ }
+
+ impl RenderWindow {
+ fn default_view(&self) -> &View {
+ &self.default_view
+ }
+ fn set_view(&mut self, _view: &View) {}
+ }
+
+ fn main() {
+ let mut rw = RenderWindow::default();
+ rw.set_view(&rw.default_view().to_owned());
+ }
+}
+
+mod issue_8759_variant {
+ #![allow(dead_code)]
+
+ #[derive(Clone, Default)]
+ struct View {}
+
+ #[derive(Default)]
+ struct RenderWindow {
+ default_view: View,
+ }
+
+ impl RenderWindow {
+ fn default_view(&self) -> &View {
+ &self.default_view
+ }
+ fn set_view(&mut self, _view: &View) {}
+ }
+
+ fn main() {
+ let mut rw = RenderWindow::default();
+ rw.set_view(&rw.default_view().to_owned());
+ }
+}
+
+mod issue_9317 {
+ #![allow(dead_code)]
+
+ struct Bytes {}
+
+ impl ToString for Bytes {
+ fn to_string(&self) -> String {
+ "123".to_string()
+ }
+ }
+
+ impl AsRef<[u8]> for Bytes {
+ fn as_ref(&self) -> &[u8] {
+ &[1, 2, 3]
+ }
+ }
+
+ fn consume<C: AsRef<[u8]>>(c: C) {
+ let _ = c;
+ }
+
+ pub fn main() {
+ let b = Bytes {};
+ // Should not lint.
+ consume(b.to_string());
+ }
+}
+
+mod issue_9351 {
+ #![allow(dead_code)]
+
+ use std::ops::Deref;
+ use std::path::{Path, PathBuf};
+
+ fn require_deref_path<T: Deref<Target = std::path::Path>>(x: T) -> T {
+ x
+ }
+
+ fn generic_arg_used_elsewhere<T: AsRef<Path>>(_x: T, _y: T) {}
+
+ fn id<T: AsRef<str>>(x: T) -> T {
+ x
+ }
+
+ fn predicates_are_satisfied(_x: impl std::fmt::Write) {}
+
+ // Should lint
+ fn single_return() -> impl AsRef<str> {
+ id("abc".to_string())
+ }
+
+ // Should not lint
+ fn multiple_returns(b: bool) -> impl AsRef<str> {
+ if b {
+ return String::new();
+ }
+
+ id("abc".to_string())
+ }
+
+ struct S1(String);
+
+ // Should not lint
+ fn fields1() -> S1 {
+ S1(id("abc".to_string()))
+ }
+
+ struct S2 {
+ s: String,
+ }
+
+ // Should not lint
+ fn fields2() {
+ let mut s = S2 { s: "abc".into() };
+ s.s = id("abc".to_string());
+ }
+
+ pub fn main() {
+ let path = std::path::Path::new("x");
+ let path_buf = path.to_owned();
+
+ // Should not lint.
+ let _x: PathBuf = require_deref_path(path.to_owned());
+ generic_arg_used_elsewhere(path.to_owned(), path_buf);
+ predicates_are_satisfied(id("abc".to_string()));
+ }
+}
+
+mod issue_9504 {
+ #![allow(dead_code)]
+
+ async fn foo<S: AsRef<str>>(_: S) {}
+ async fn bar() {
+ foo(std::path::PathBuf::new().to_string_lossy().to_string()).await;
+ }
+}
--- /dev/null
- #![feature(box_patterns)]
+// run-rustfix
+
- #![allow(unreachable_patterns, irrefutable_let_patterns, unused_variables)]
++#![feature(box_patterns, custom_inner_attributes)]
+#![warn(clippy::unnested_or_patterns)]
+#![allow(clippy::cognitive_complexity, clippy::match_ref_pats, clippy::upper_case_acronyms)]
++#![allow(unreachable_patterns, irrefutable_let_patterns, unused)]
+
+fn main() {
+ // Should be ignored by this lint, as nesting requires more characters.
+ if let &0 | &2 = &0 {}
+
+ if let box (0 | 2) = Box::new(0) {}
+ if let box (0 | 1 | 2 | 3 | 4) = Box::new(0) {}
+ const C0: Option<u8> = Some(1);
+ if let Some(1 | 2) | C0 = None {}
+ if let &mut (0 | 2) = &mut 0 {}
+ if let x @ (0 | 2) = 0 {}
+ if let (0, 1 | 2 | 3) = (0, 0) {}
+ if let (1 | 2 | 3, 0) = (0, 0) {}
+ if let (x, ..) | (x, 1 | 2) = (0, 1) {}
+ if let [0 | 1] = [0] {}
+ if let [x, 0 | 1] = [0, 1] {}
+ if let [x, 0 | 1 | 2] = [0, 1] {}
+ if let [x, ..] | [x, 1 | 2] = [0, 1] {}
+ struct TS(u8, u8);
+ if let TS(0 | 1, x) = TS(0, 0) {}
+ if let TS(1 | 2 | 3, 0) = TS(0, 0) {}
+ if let TS(x, ..) | TS(x, 1 | 2) = TS(0, 0) {}
+ struct S {
+ x: u8,
+ y: u8,
+ }
+ if let S { x: 0 | 1, y } = (S { x: 0, y: 1 }) {}
+ if let S { x: 0, y, .. } | S { y, x: 1 } = (S { x: 0, y: 1 }) {}
+}
++
++fn msrv_1_52() {
++ #![clippy::msrv = "1.52"]
++
++ if let [1] | [52] = [0] {}
++}
++
++fn msrv_1_53() {
++ #![clippy::msrv = "1.53"]
++
++ if let [1 | 53] = [0] {}
++}
--- /dev/null
- #![feature(box_patterns)]
+// run-rustfix
+
- #![allow(unreachable_patterns, irrefutable_let_patterns, unused_variables)]
++#![feature(box_patterns, custom_inner_attributes)]
+#![warn(clippy::unnested_or_patterns)]
+#![allow(clippy::cognitive_complexity, clippy::match_ref_pats, clippy::upper_case_acronyms)]
++#![allow(unreachable_patterns, irrefutable_let_patterns, unused)]
+
+fn main() {
+ // Should be ignored by this lint, as nesting requires more characters.
+ if let &0 | &2 = &0 {}
+
+ if let box 0 | box 2 = Box::new(0) {}
+ if let box ((0 | 1)) | box (2 | 3) | box 4 = Box::new(0) {}
+ const C0: Option<u8> = Some(1);
+ if let Some(1) | C0 | Some(2) = None {}
+ if let &mut 0 | &mut 2 = &mut 0 {}
+ if let x @ 0 | x @ 2 = 0 {}
+ if let (0, 1) | (0, 2) | (0, 3) = (0, 0) {}
+ if let (1, 0) | (2, 0) | (3, 0) = (0, 0) {}
+ if let (x, ..) | (x, 1) | (x, 2) = (0, 1) {}
+ if let [0] | [1] = [0] {}
+ if let [x, 0] | [x, 1] = [0, 1] {}
+ if let [x, 0] | [x, 1] | [x, 2] = [0, 1] {}
+ if let [x, ..] | [x, 1] | [x, 2] = [0, 1] {}
+ struct TS(u8, u8);
+ if let TS(0, x) | TS(1, x) = TS(0, 0) {}
+ if let TS(1, 0) | TS(2, 0) | TS(3, 0) = TS(0, 0) {}
+ if let TS(x, ..) | TS(x, 1) | TS(x, 2) = TS(0, 0) {}
+ struct S {
+ x: u8,
+ y: u8,
+ }
+ if let S { x: 0, y } | S { y, x: 1 } = (S { x: 0, y: 1 }) {}
+ if let S { x: 0, y, .. } | S { y, x: 1 } = (S { x: 0, y: 1 }) {}
+}
++
++fn msrv_1_52() {
++ #![clippy::msrv = "1.52"]
++
++ if let [1] | [52] = [0] {}
++}
++
++fn msrv_1_53() {
++ #![clippy::msrv = "1.53"]
++
++ if let [1] | [53] = [0] {}
++}
--- /dev/null
- error: aborting due to 16 previous errors
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:12:12
+ |
+LL | if let box 0 | box 2 = Box::new(0) {}
+ | ^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::unnested-or-patterns` implied by `-D warnings`
+help: nest the patterns
+ |
+LL | if let box (0 | 2) = Box::new(0) {}
+ | ~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:13:12
+ |
+LL | if let box ((0 | 1)) | box (2 | 3) | box 4 = Box::new(0) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let box (0 | 1 | 2 | 3 | 4) = Box::new(0) {}
+ | ~~~~~~~~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:15:12
+ |
+LL | if let Some(1) | C0 | Some(2) = None {}
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let Some(1 | 2) | C0 = None {}
+ | ~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:16:12
+ |
+LL | if let &mut 0 | &mut 2 = &mut 0 {}
+ | ^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let &mut (0 | 2) = &mut 0 {}
+ | ~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:17:12
+ |
+LL | if let x @ 0 | x @ 2 = 0 {}
+ | ^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let x @ (0 | 2) = 0 {}
+ | ~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:18:12
+ |
+LL | if let (0, 1) | (0, 2) | (0, 3) = (0, 0) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let (0, 1 | 2 | 3) = (0, 0) {}
+ | ~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:19:12
+ |
+LL | if let (1, 0) | (2, 0) | (3, 0) = (0, 0) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let (1 | 2 | 3, 0) = (0, 0) {}
+ | ~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:20:12
+ |
+LL | if let (x, ..) | (x, 1) | (x, 2) = (0, 1) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let (x, ..) | (x, 1 | 2) = (0, 1) {}
+ | ~~~~~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:21:12
+ |
+LL | if let [0] | [1] = [0] {}
+ | ^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let [0 | 1] = [0] {}
+ | ~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:22:12
+ |
+LL | if let [x, 0] | [x, 1] = [0, 1] {}
+ | ^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let [x, 0 | 1] = [0, 1] {}
+ | ~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:23:12
+ |
+LL | if let [x, 0] | [x, 1] | [x, 2] = [0, 1] {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let [x, 0 | 1 | 2] = [0, 1] {}
+ | ~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:24:12
+ |
+LL | if let [x, ..] | [x, 1] | [x, 2] = [0, 1] {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let [x, ..] | [x, 1 | 2] = [0, 1] {}
+ | ~~~~~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:26:12
+ |
+LL | if let TS(0, x) | TS(1, x) = TS(0, 0) {}
+ | ^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let TS(0 | 1, x) = TS(0, 0) {}
+ | ~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:27:12
+ |
+LL | if let TS(1, 0) | TS(2, 0) | TS(3, 0) = TS(0, 0) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let TS(1 | 2 | 3, 0) = TS(0, 0) {}
+ | ~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:28:12
+ |
+LL | if let TS(x, ..) | TS(x, 1) | TS(x, 2) = TS(0, 0) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let TS(x, ..) | TS(x, 1 | 2) = TS(0, 0) {}
+ | ~~~~~~~~~~~~~~~~~~~~~~~~
+
+error: unnested or-patterns
+ --> $DIR/unnested_or_patterns.rs:33:12
+ |
+LL | if let S { x: 0, y } | S { y, x: 1 } = (S { x: 0, y: 1 }) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: nest the patterns
+ |
+LL | if let S { x: 0 | 1, y } = (S { x: 0, y: 1 }) {}
+ | ~~~~~~~~~~~~~~~~~
+
++error: unnested or-patterns
++ --> $DIR/unnested_or_patterns.rs:46:12
++ |
++LL | if let [1] | [53] = [0] {}
++ | ^^^^^^^^^^
++ |
++help: nest the patterns
++ |
++LL | if let [1 | 53] = [0] {}
++ | ~~~~~~~~
++
++error: aborting due to 17 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::unused_format_specs)]
++#![allow(unused)]
++
++fn main() {
++ let f = 1.0f64;
++ println!("{}", 1.0);
++ println!("{f} {f:?}");
++
++ println!("{}", 1);
++}
++
++fn should_not_lint() {
++ let f = 1.0f64;
++ println!("{:.1}", 1.0);
++ println!("{f:.w$} {f:.*?}", 3, w = 2);
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::unused_format_specs)]
++#![allow(unused)]
++
++fn main() {
++ let f = 1.0f64;
++ println!("{:.}", 1.0);
++ println!("{f:.} {f:.?}");
++
++ println!("{:.}", 1);
++}
++
++fn should_not_lint() {
++ let f = 1.0f64;
++ println!("{:.1}", 1.0);
++ println!("{f:.w$} {f:.*?}", 3, w = 2);
++}
--- /dev/null
--- /dev/null
++error: empty precision specifier has no effect
++ --> $DIR/unused_format_specs.rs:8:17
++ |
++LL | println!("{:.}", 1.0);
++ | ^
++ |
++ = note: a precision specifier is not required to format floats
++ = note: `-D clippy::unused-format-specs` implied by `-D warnings`
++help: remove the `.`
++ |
++LL - println!("{:.}", 1.0);
++LL + println!("{}", 1.0);
++ |
++
++error: empty precision specifier has no effect
++ --> $DIR/unused_format_specs.rs:9:18
++ |
++LL | println!("{f:.} {f:.?}");
++ | ^
++ |
++ = note: a precision specifier is not required to format floats
++help: remove the `.`
++ |
++LL - println!("{f:.} {f:.?}");
++LL + println!("{f} {f:.?}");
++ |
++
++error: empty precision specifier has no effect
++ --> $DIR/unused_format_specs.rs:9:24
++ |
++LL | println!("{f:.} {f:.?}");
++ | ^
++ |
++ = note: a precision specifier is not required to format floats
++help: remove the `.`
++ |
++LL - println!("{f:.} {f:.?}");
++LL + println!("{f:.} {f:?}");
++ |
++
++error: empty precision specifier has no effect
++ --> $DIR/unused_format_specs.rs:11:17
++ |
++LL | println!("{:.}", 1);
++ | ^
++ |
++help: remove the `.`
++ |
++LL - println!("{:.}", 1);
++LL + println!("{}", 1);
++ |
++
++error: aborting due to 4 previous errors
++
--- /dev/null
--- /dev/null
++#![warn(clippy::unused_format_specs)]
++#![allow(unused)]
++
++macro_rules! format_args_from_macro {
++ () => {
++ format_args!("from macro")
++ };
++}
++
++fn main() {
++ // prints `.`, not ` .`
++ println!("{:5}.", format_args!(""));
++ //prints `abcde`, not `abc`
++ println!("{:.3}", format_args!("abcde"));
++
++ println!("{:5}.", format_args_from_macro!());
++
++ let args = format_args!("");
++ println!("{args:5}");
++}
++
++fn should_not_lint() {
++ println!("{}", format_args!(""));
++ // Technically the same as `{}`, but the `format_args` docs specifically mention that you can use
++ // debug formatting so allow it
++ println!("{:?}", format_args!(""));
++
++ let args = format_args!("");
++ println!("{args}");
++}
--- /dev/null
--- /dev/null
++error: format specifiers have no effect on `format_args!()`
++ --> $DIR/unused_format_specs_unfixable.rs:12:15
++ |
++LL | println!("{:5}.", format_args!(""));
++ | ^^^^
++ |
++ = note: `-D clippy::unused-format-specs` implied by `-D warnings`
++help: for the width to apply consider using `format!()`
++ |
++LL | println!("{:5}.", format!(""));
++ | ~~~~~~
++help: if the current behavior is intentional, remove the format specifiers
++ |
++LL - println!("{:5}.", format_args!(""));
++LL + println!("{}.", format_args!(""));
++ |
++
++error: format specifiers have no effect on `format_args!()`
++ --> $DIR/unused_format_specs_unfixable.rs:14:15
++ |
++LL | println!("{:.3}", format_args!("abcde"));
++ | ^^^^^
++ |
++help: for the precision to apply consider using `format!()`
++ |
++LL | println!("{:.3}", format!("abcde"));
++ | ~~~~~~
++help: if the current behavior is intentional, remove the format specifiers
++ |
++LL - println!("{:.3}", format_args!("abcde"));
++LL + println!("{}", format_args!("abcde"));
++ |
++
++error: format specifiers have no effect on `format_args!()`
++ --> $DIR/unused_format_specs_unfixable.rs:16:15
++ |
++LL | println!("{:5}.", format_args_from_macro!());
++ | ^^^^
++ |
++help: for the width to apply consider using `format!()`
++ --> $DIR/unused_format_specs_unfixable.rs:16:17
++ |
++LL | println!("{:5}.", format_args_from_macro!());
++ | ^
++help: if the current behavior is intentional, remove the format specifiers
++ |
++LL - println!("{:5}.", format_args_from_macro!());
++LL + println!("{}.", format_args_from_macro!());
++ |
++
++error: format specifiers have no effect on `format_args!()`
++ --> $DIR/unused_format_specs_unfixable.rs:19:15
++ |
++LL | println!("{args:5}");
++ | ^^^^^^^^
++ |
++help: for the width to apply consider using `format!()`
++ --> $DIR/unused_format_specs_unfixable.rs:19:21
++ |
++LL | println!("{args:5}");
++ | ^
++help: if the current behavior is intentional, remove the format specifiers
++ |
++LL - println!("{args:5}");
++LL + println!("{args}");
++ |
++
++error: aborting due to 4 previous errors
++
--- /dev/null
+// run-rustfix
+// aux-build:proc_macro_derive.rs
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::use_self)]
+#![allow(dead_code, unreachable_code)]
+#![allow(
+ clippy::should_implement_trait,
+ clippy::upper_case_acronyms,
+ clippy::from_over_into,
+ clippy::self_named_constructors
+)]
+
+#[macro_use]
+extern crate proc_macro_derive;
+
+fn main() {}
+
+mod use_self {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Self {
+ Self {}
+ }
+ fn test() -> Self {
+ Self::new()
+ }
+ }
+
+ impl Default for Foo {
+ fn default() -> Self {
+ Self::new()
+ }
+ }
+}
+
+mod better {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Self {
+ Self {}
+ }
+ fn test() -> Self {
+ Self::new()
+ }
+ }
+
+ impl Default for Foo {
+ fn default() -> Self {
+ Self::new()
+ }
+ }
+}
+
+mod lifetimes {
+ struct Foo<'a> {
+ foo_str: &'a str,
+ }
+
+ impl<'a> Foo<'a> {
+ // Cannot use `Self` as return type, because the function is actually `fn foo<'b>(s: &'b str) ->
+ // Foo<'b>`
+ fn foo(s: &str) -> Foo {
+ Foo { foo_str: s }
+ }
+ // cannot replace with `Self`, because that's `Foo<'a>`
+ fn bar() -> Foo<'static> {
+ Foo { foo_str: "foo" }
+ }
+
+ // FIXME: the lint does not handle lifetimed struct
+ // `Self` should be applicable here
+ fn clone(&self) -> Foo<'a> {
+ Foo { foo_str: self.foo_str }
+ }
+ }
+}
+
+mod issue2894 {
+ trait IntoBytes {
+ fn to_bytes(self) -> Vec<u8>;
+ }
+
+ // This should not be linted
+ impl IntoBytes for u8 {
+ fn to_bytes(self) -> Vec<u8> {
+ vec![self]
+ }
+ }
+}
+
+mod existential {
+ struct Foo;
+
+ impl Foo {
+ fn bad(foos: &[Self]) -> impl Iterator<Item = &Self> {
+ foos.iter()
+ }
+
+ fn good(foos: &[Self]) -> impl Iterator<Item = &Self> {
+ foos.iter()
+ }
+ }
+}
+
+mod tuple_structs {
+ pub struct TS(i32);
+
+ impl TS {
+ pub fn ts() -> Self {
+ Self(0)
+ }
+ }
+}
+
+mod macros {
+ macro_rules! use_self_expand {
+ () => {
+ fn new() -> Foo {
+ Foo {}
+ }
+ };
+ }
+
+ struct Foo;
+
+ impl Foo {
+ use_self_expand!(); // Should not lint in local macros
+ }
+
+ #[derive(StructAUseSelf)] // Should not lint in derives
+ struct A;
+}
+
+mod nesting {
+ struct Foo;
+ impl Foo {
+ fn foo() {
+ #[allow(unused_imports)]
+ use self::Foo; // Can't use Self here
+ struct Bar {
+ foo: Foo, // Foo != Self
+ }
+
+ impl Bar {
+ fn bar() -> Self {
+ Self { foo: Foo {} }
+ }
+ }
+
+ // Can't use Self here
+ fn baz() -> Foo {
+ Foo {}
+ }
+ }
+
+ // Should lint here
+ fn baz() -> Self {
+ Self {}
+ }
+ }
+
+ enum Enum {
+ A,
+ B(u64),
+ C { field: bool },
+ }
+ impl Enum {
+ fn method() {
+ #[allow(unused_imports)]
+ use self::Enum::*; // Issue 3425
+ static STATIC: Enum = Enum::A; // Can't use Self as type
+ }
+
+ fn method2() {
+ let _ = Self::B(42);
+ let _ = Self::C { field: true };
+ let _ = Self::A;
+ }
+ }
+}
+
+mod issue3410 {
+
+ struct A;
+ struct B;
+
+ trait Trait<T> {
+ fn a(v: T) -> Self;
+ }
+
+ impl Trait<Vec<A>> for Vec<B> {
+ fn a(_: Vec<A>) -> Self {
+ unimplemented!()
+ }
+ }
+
+ impl<T> Trait<Vec<A>> for Vec<T>
+ where
+ T: Trait<B>,
+ {
+ fn a(v: Vec<A>) -> Self {
+ <Vec<B>>::a(v).into_iter().map(Trait::a).collect()
+ }
+ }
+}
+
+#[allow(clippy::no_effect, path_statements)]
+mod rustfix {
+ mod nested {
+ pub struct A;
+ }
+
+ impl nested::A {
+ const A: bool = true;
+
+ fn fun_1() {}
+
+ fn fun_2() {
+ Self::fun_1();
+ Self::A;
+
+ Self {};
+ }
+ }
+}
+
+mod issue3567 {
+ struct TestStruct;
+ impl TestStruct {
+ fn from_something() -> Self {
+ Self {}
+ }
+ }
+
+ trait Test {
+ fn test() -> TestStruct;
+ }
+
+ impl Test for TestStruct {
+ fn test() -> TestStruct {
+ Self::from_something()
+ }
+ }
+}
+
+mod paths_created_by_lowering {
+ use std::ops::Range;
+
+ struct S;
+
+ impl S {
+ const A: usize = 0;
+ const B: usize = 1;
+
+ async fn g() -> Self {
+ Self {}
+ }
+
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8] {
+ &p[Self::A..Self::B]
+ }
+ }
+
+ trait T {
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8];
+ }
+
+ impl T for Range<u8> {
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8] {
+ &p[0..1]
+ }
+ }
+}
+
+// reused from #1997
+mod generics {
+ struct Foo<T> {
+ value: T,
+ }
+
+ impl<T> Foo<T> {
+ // `Self` is applicable here
+ fn foo(value: T) -> Self {
+ Self { value }
+ }
+
+ // `Cannot` use `Self` as a return type as the generic types are different
+ fn bar(value: i32) -> Foo<i32> {
+ Foo { value }
+ }
+ }
+}
+
+mod issue4140 {
+ pub struct Error<From, To> {
+ _from: From,
+ _too: To,
+ }
+
+ pub trait From<T> {
+ type From;
+ type To;
+
+ fn from(value: T) -> Self;
+ }
+
+ pub trait TryFrom<T>
+ where
+ Self: Sized,
+ {
+ type From;
+ type To;
+
+ fn try_from(value: T) -> Result<Self, Error<Self::From, Self::To>>;
+ }
+
+ // FIXME: Suggested fix results in infinite recursion.
+ // impl<F, T> TryFrom<F> for T
+ // where
+ // T: From<F>,
+ // {
+ // type From = Self::From;
+ // type To = Self::To;
+
+ // fn try_from(value: F) -> Result<Self, Error<Self::From, Self::To>> {
+ // Ok(From::from(value))
+ // }
+ // }
+
+ impl From<bool> for i64 {
+ type From = bool;
+ type To = Self;
+
+ fn from(value: bool) -> Self {
+ if value { 100 } else { 0 }
+ }
+ }
+}
+
+mod issue2843 {
+ trait Foo {
+ type Bar;
+ }
+
+ impl Foo for usize {
+ type Bar = u8;
+ }
+
+ impl<T: Foo> Foo for Option<T> {
+ type Bar = Option<T::Bar>;
+ }
+}
+
+mod issue3859 {
+ pub struct Foo;
+ pub struct Bar([usize; 3]);
+
+ impl Foo {
+ pub const BAR: usize = 3;
+
+ pub fn foo() {
+ const _X: usize = Foo::BAR;
+ // const _Y: usize = Self::BAR;
+ }
+ }
+}
+
+mod issue4305 {
+ trait Foo: 'static {}
+
+ struct Bar;
+
+ impl Foo for Bar {}
+
+ impl<T: Foo> From<T> for Box<dyn Foo> {
+ fn from(t: T) -> Self {
+ Box::new(t)
+ }
+ }
+}
+
+mod lint_at_item_level {
+ struct Foo;
+
+ #[allow(clippy::use_self)]
+ impl Foo {
+ fn new() -> Foo {
+ Foo {}
+ }
+ }
+
+ #[allow(clippy::use_self)]
+ impl Default for Foo {
+ fn default() -> Foo {
+ Foo::new()
+ }
+ }
+}
+
+mod lint_at_impl_item_level {
+ struct Foo;
+
+ impl Foo {
+ #[allow(clippy::use_self)]
+ fn new() -> Foo {
+ Foo {}
+ }
+ }
+
+ impl Default for Foo {
+ #[allow(clippy::use_self)]
+ fn default() -> Foo {
+ Foo::new()
+ }
+ }
+}
+
+mod issue4734 {
+ #[repr(C, packed)]
+ pub struct X {
+ pub x: u32,
+ }
+
+ impl From<X> for u32 {
+ fn from(c: X) -> Self {
+ unsafe { core::mem::transmute(c) }
+ }
+ }
+}
+
+mod nested_paths {
+ use std::convert::Into;
+ mod submod {
+ pub struct B;
+ pub struct C;
+
+ impl Into<C> for B {
+ fn into(self) -> C {
+ C {}
+ }
+ }
+ }
+
+ struct A<T> {
+ t: T,
+ }
+
+ impl<T> A<T> {
+ fn new<V: Into<T>>(v: V) -> Self {
+ Self { t: Into::into(v) }
+ }
+ }
+
+ impl A<submod::C> {
+ fn test() -> Self {
+ Self::new::<submod::B>(submod::B {})
+ }
+ }
+}
+
+mod issue6818 {
+ #[derive(serde::Deserialize)]
+ struct A {
+ a: i32,
+ }
+}
+
+mod issue7206 {
+ struct MyStruct<const C: char>;
+ impl From<MyStruct<'a'>> for MyStruct<'b'> {
+ fn from(_s: MyStruct<'a'>) -> Self {
+ Self
+ }
+ }
+
+ // keep linting non-`Const` generic args
+ struct S<'a> {
+ inner: &'a str,
+ }
+
+ struct S2<T> {
+ inner: T,
+ }
+
+ impl<T> S2<T> {
+ fn new() -> Self {
+ unimplemented!();
+ }
+ }
+
+ impl<'a> S2<S<'a>> {
+ fn new_again() -> Self {
+ Self::new()
+ }
+ }
+}
+
+mod self_is_ty_param {
+ trait Trait {
+ type Type;
+ type Hi;
+
+ fn test();
+ }
+
+ impl<I> Trait for I
+ where
+ I: Iterator,
+ I::Item: Trait, // changing this to Self would require <Self as Iterator>
+ {
+ type Type = I;
+ type Hi = I::Item;
+
+ fn test() {
+ let _: I::Item;
+ let _: I; // this could lint, but is questionable
+ }
+ }
+}
+
+mod use_self_in_pat {
+ enum Foo {
+ Bar,
+ Baz,
+ }
+
+ impl Foo {
+ fn do_stuff(self) {
+ match self {
+ Self::Bar => unimplemented!(),
+ Self::Baz => unimplemented!(),
+ }
+ match Some(1) {
+ Some(_) => unimplemented!(),
+ None => unimplemented!(),
+ }
+ if let Self::Bar = self {
+ unimplemented!()
+ }
+ }
+ }
+}
+
+mod issue8845 {
+ pub enum Something {
+ Num(u8),
+ TupleNums(u8, u8),
+ StructNums { one: u8, two: u8 },
+ }
+
+ struct Foo(u8);
+
+ struct Bar {
+ x: u8,
+ y: usize,
+ }
+
+ impl Something {
+ fn get_value(&self) -> u8 {
+ match self {
+ Self::Num(n) => *n,
+ Self::TupleNums(n, _m) => *n,
+ Self::StructNums { one, two: _ } => *one,
+ }
+ }
+
+ fn use_crate(&self) -> u8 {
+ match self {
+ Self::Num(n) => *n,
+ Self::TupleNums(n, _m) => *n,
+ Self::StructNums { one, two: _ } => *one,
+ }
+ }
+
+ fn imported_values(&self) -> u8 {
+ use Something::*;
+ match self {
+ Num(n) => *n,
+ TupleNums(n, _m) => *n,
+ StructNums { one, two: _ } => *one,
+ }
+ }
+ }
+
+ impl Foo {
+ fn get_value(&self) -> u8 {
+ let Self(x) = self;
+ *x
+ }
+
+ fn use_crate(&self) -> u8 {
+ let Self(x) = self;
+ *x
+ }
+ }
+
+ impl Bar {
+ fn get_value(&self) -> u8 {
+ let Self { x, .. } = self;
+ *x
+ }
+
+ fn use_crate(&self) -> u8 {
+ let Self { x, .. } = self;
+ *x
+ }
+ }
+}
+
+mod issue6902 {
+ use serde::Serialize;
+
+ #[derive(Serialize)]
+ pub enum Foo {
+ Bar = 1,
+ }
+}
++
++fn msrv_1_36() {
++ #![clippy::msrv = "1.36"]
++
++ enum E {
++ A,
++ }
++
++ impl E {
++ fn foo(self) {
++ match self {
++ E::A => {},
++ }
++ }
++ }
++}
++
++fn msrv_1_37() {
++ #![clippy::msrv = "1.37"]
++
++ enum E {
++ A,
++ }
++
++ impl E {
++ fn foo(self) {
++ match self {
++ Self::A => {},
++ }
++ }
++ }
++}
--- /dev/null
+// run-rustfix
+// aux-build:proc_macro_derive.rs
+
++#![feature(custom_inner_attributes)]
+#![warn(clippy::use_self)]
+#![allow(dead_code, unreachable_code)]
+#![allow(
+ clippy::should_implement_trait,
+ clippy::upper_case_acronyms,
+ clippy::from_over_into,
+ clippy::self_named_constructors
+)]
+
+#[macro_use]
+extern crate proc_macro_derive;
+
+fn main() {}
+
+mod use_self {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Foo {
+ Foo {}
+ }
+ fn test() -> Foo {
+ Foo::new()
+ }
+ }
+
+ impl Default for Foo {
+ fn default() -> Foo {
+ Foo::new()
+ }
+ }
+}
+
+mod better {
+ struct Foo;
+
+ impl Foo {
+ fn new() -> Self {
+ Self {}
+ }
+ fn test() -> Self {
+ Self::new()
+ }
+ }
+
+ impl Default for Foo {
+ fn default() -> Self {
+ Self::new()
+ }
+ }
+}
+
+mod lifetimes {
+ struct Foo<'a> {
+ foo_str: &'a str,
+ }
+
+ impl<'a> Foo<'a> {
+ // Cannot use `Self` as return type, because the function is actually `fn foo<'b>(s: &'b str) ->
+ // Foo<'b>`
+ fn foo(s: &str) -> Foo {
+ Foo { foo_str: s }
+ }
+ // cannot replace with `Self`, because that's `Foo<'a>`
+ fn bar() -> Foo<'static> {
+ Foo { foo_str: "foo" }
+ }
+
+ // FIXME: the lint does not handle lifetimed struct
+ // `Self` should be applicable here
+ fn clone(&self) -> Foo<'a> {
+ Foo { foo_str: self.foo_str }
+ }
+ }
+}
+
+mod issue2894 {
+ trait IntoBytes {
+ fn to_bytes(self) -> Vec<u8>;
+ }
+
+ // This should not be linted
+ impl IntoBytes for u8 {
+ fn to_bytes(self) -> Vec<u8> {
+ vec![self]
+ }
+ }
+}
+
+mod existential {
+ struct Foo;
+
+ impl Foo {
+ fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
+ foos.iter()
+ }
+
+ fn good(foos: &[Self]) -> impl Iterator<Item = &Self> {
+ foos.iter()
+ }
+ }
+}
+
+mod tuple_structs {
+ pub struct TS(i32);
+
+ impl TS {
+ pub fn ts() -> Self {
+ TS(0)
+ }
+ }
+}
+
+mod macros {
+ macro_rules! use_self_expand {
+ () => {
+ fn new() -> Foo {
+ Foo {}
+ }
+ };
+ }
+
+ struct Foo;
+
+ impl Foo {
+ use_self_expand!(); // Should not lint in local macros
+ }
+
+ #[derive(StructAUseSelf)] // Should not lint in derives
+ struct A;
+}
+
+mod nesting {
+ struct Foo;
+ impl Foo {
+ fn foo() {
+ #[allow(unused_imports)]
+ use self::Foo; // Can't use Self here
+ struct Bar {
+ foo: Foo, // Foo != Self
+ }
+
+ impl Bar {
+ fn bar() -> Bar {
+ Bar { foo: Foo {} }
+ }
+ }
+
+ // Can't use Self here
+ fn baz() -> Foo {
+ Foo {}
+ }
+ }
+
+ // Should lint here
+ fn baz() -> Foo {
+ Foo {}
+ }
+ }
+
+ enum Enum {
+ A,
+ B(u64),
+ C { field: bool },
+ }
+ impl Enum {
+ fn method() {
+ #[allow(unused_imports)]
+ use self::Enum::*; // Issue 3425
+ static STATIC: Enum = Enum::A; // Can't use Self as type
+ }
+
+ fn method2() {
+ let _ = Enum::B(42);
+ let _ = Enum::C { field: true };
+ let _ = Enum::A;
+ }
+ }
+}
+
+mod issue3410 {
+
+ struct A;
+ struct B;
+
+ trait Trait<T> {
+ fn a(v: T) -> Self;
+ }
+
+ impl Trait<Vec<A>> for Vec<B> {
+ fn a(_: Vec<A>) -> Self {
+ unimplemented!()
+ }
+ }
+
+ impl<T> Trait<Vec<A>> for Vec<T>
+ where
+ T: Trait<B>,
+ {
+ fn a(v: Vec<A>) -> Self {
+ <Vec<B>>::a(v).into_iter().map(Trait::a).collect()
+ }
+ }
+}
+
+#[allow(clippy::no_effect, path_statements)]
+mod rustfix {
+ mod nested {
+ pub struct A;
+ }
+
+ impl nested::A {
+ const A: bool = true;
+
+ fn fun_1() {}
+
+ fn fun_2() {
+ nested::A::fun_1();
+ nested::A::A;
+
+ nested::A {};
+ }
+ }
+}
+
+mod issue3567 {
+ struct TestStruct;
+ impl TestStruct {
+ fn from_something() -> Self {
+ Self {}
+ }
+ }
+
+ trait Test {
+ fn test() -> TestStruct;
+ }
+
+ impl Test for TestStruct {
+ fn test() -> TestStruct {
+ TestStruct::from_something()
+ }
+ }
+}
+
+mod paths_created_by_lowering {
+ use std::ops::Range;
+
+ struct S;
+
+ impl S {
+ const A: usize = 0;
+ const B: usize = 1;
+
+ async fn g() -> S {
+ S {}
+ }
+
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8] {
+ &p[S::A..S::B]
+ }
+ }
+
+ trait T {
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8];
+ }
+
+ impl T for Range<u8> {
+ fn f<'a>(&self, p: &'a [u8]) -> &'a [u8] {
+ &p[0..1]
+ }
+ }
+}
+
+// reused from #1997
+mod generics {
+ struct Foo<T> {
+ value: T,
+ }
+
+ impl<T> Foo<T> {
+ // `Self` is applicable here
+ fn foo(value: T) -> Foo<T> {
+ Foo::<T> { value }
+ }
+
+ // `Cannot` use `Self` as a return type as the generic types are different
+ fn bar(value: i32) -> Foo<i32> {
+ Foo { value }
+ }
+ }
+}
+
+mod issue4140 {
+ pub struct Error<From, To> {
+ _from: From,
+ _too: To,
+ }
+
+ pub trait From<T> {
+ type From;
+ type To;
+
+ fn from(value: T) -> Self;
+ }
+
+ pub trait TryFrom<T>
+ where
+ Self: Sized,
+ {
+ type From;
+ type To;
+
+ fn try_from(value: T) -> Result<Self, Error<Self::From, Self::To>>;
+ }
+
+ // FIXME: Suggested fix results in infinite recursion.
+ // impl<F, T> TryFrom<F> for T
+ // where
+ // T: From<F>,
+ // {
+ // type From = Self::From;
+ // type To = Self::To;
+
+ // fn try_from(value: F) -> Result<Self, Error<Self::From, Self::To>> {
+ // Ok(From::from(value))
+ // }
+ // }
+
+ impl From<bool> for i64 {
+ type From = bool;
+ type To = Self;
+
+ fn from(value: bool) -> Self {
+ if value { 100 } else { 0 }
+ }
+ }
+}
+
+mod issue2843 {
+ trait Foo {
+ type Bar;
+ }
+
+ impl Foo for usize {
+ type Bar = u8;
+ }
+
+ impl<T: Foo> Foo for Option<T> {
+ type Bar = Option<T::Bar>;
+ }
+}
+
+mod issue3859 {
+ pub struct Foo;
+ pub struct Bar([usize; 3]);
+
+ impl Foo {
+ pub const BAR: usize = 3;
+
+ pub fn foo() {
+ const _X: usize = Foo::BAR;
+ // const _Y: usize = Self::BAR;
+ }
+ }
+}
+
+mod issue4305 {
+ trait Foo: 'static {}
+
+ struct Bar;
+
+ impl Foo for Bar {}
+
+ impl<T: Foo> From<T> for Box<dyn Foo> {
+ fn from(t: T) -> Self {
+ Box::new(t)
+ }
+ }
+}
+
+mod lint_at_item_level {
+ struct Foo;
+
+ #[allow(clippy::use_self)]
+ impl Foo {
+ fn new() -> Foo {
+ Foo {}
+ }
+ }
+
+ #[allow(clippy::use_self)]
+ impl Default for Foo {
+ fn default() -> Foo {
+ Foo::new()
+ }
+ }
+}
+
+mod lint_at_impl_item_level {
+ struct Foo;
+
+ impl Foo {
+ #[allow(clippy::use_self)]
+ fn new() -> Foo {
+ Foo {}
+ }
+ }
+
+ impl Default for Foo {
+ #[allow(clippy::use_self)]
+ fn default() -> Foo {
+ Foo::new()
+ }
+ }
+}
+
+mod issue4734 {
+ #[repr(C, packed)]
+ pub struct X {
+ pub x: u32,
+ }
+
+ impl From<X> for u32 {
+ fn from(c: X) -> Self {
+ unsafe { core::mem::transmute(c) }
+ }
+ }
+}
+
+mod nested_paths {
+ use std::convert::Into;
+ mod submod {
+ pub struct B;
+ pub struct C;
+
+ impl Into<C> for B {
+ fn into(self) -> C {
+ C {}
+ }
+ }
+ }
+
+ struct A<T> {
+ t: T,
+ }
+
+ impl<T> A<T> {
+ fn new<V: Into<T>>(v: V) -> Self {
+ Self { t: Into::into(v) }
+ }
+ }
+
+ impl A<submod::C> {
+ fn test() -> Self {
+ A::new::<submod::B>(submod::B {})
+ }
+ }
+}
+
+mod issue6818 {
+ #[derive(serde::Deserialize)]
+ struct A {
+ a: i32,
+ }
+}
+
+mod issue7206 {
+ struct MyStruct<const C: char>;
+ impl From<MyStruct<'a'>> for MyStruct<'b'> {
+ fn from(_s: MyStruct<'a'>) -> Self {
+ Self
+ }
+ }
+
+ // keep linting non-`Const` generic args
+ struct S<'a> {
+ inner: &'a str,
+ }
+
+ struct S2<T> {
+ inner: T,
+ }
+
+ impl<T> S2<T> {
+ fn new() -> Self {
+ unimplemented!();
+ }
+ }
+
+ impl<'a> S2<S<'a>> {
+ fn new_again() -> Self {
+ S2::new()
+ }
+ }
+}
+
+mod self_is_ty_param {
+ trait Trait {
+ type Type;
+ type Hi;
+
+ fn test();
+ }
+
+ impl<I> Trait for I
+ where
+ I: Iterator,
+ I::Item: Trait, // changing this to Self would require <Self as Iterator>
+ {
+ type Type = I;
+ type Hi = I::Item;
+
+ fn test() {
+ let _: I::Item;
+ let _: I; // this could lint, but is questionable
+ }
+ }
+}
+
+mod use_self_in_pat {
+ enum Foo {
+ Bar,
+ Baz,
+ }
+
+ impl Foo {
+ fn do_stuff(self) {
+ match self {
+ Foo::Bar => unimplemented!(),
+ Foo::Baz => unimplemented!(),
+ }
+ match Some(1) {
+ Some(_) => unimplemented!(),
+ None => unimplemented!(),
+ }
+ if let Foo::Bar = self {
+ unimplemented!()
+ }
+ }
+ }
+}
+
+mod issue8845 {
+ pub enum Something {
+ Num(u8),
+ TupleNums(u8, u8),
+ StructNums { one: u8, two: u8 },
+ }
+
+ struct Foo(u8);
+
+ struct Bar {
+ x: u8,
+ y: usize,
+ }
+
+ impl Something {
+ fn get_value(&self) -> u8 {
+ match self {
+ Something::Num(n) => *n,
+ Something::TupleNums(n, _m) => *n,
+ Something::StructNums { one, two: _ } => *one,
+ }
+ }
+
+ fn use_crate(&self) -> u8 {
+ match self {
+ crate::issue8845::Something::Num(n) => *n,
+ crate::issue8845::Something::TupleNums(n, _m) => *n,
+ crate::issue8845::Something::StructNums { one, two: _ } => *one,
+ }
+ }
+
+ fn imported_values(&self) -> u8 {
+ use Something::*;
+ match self {
+ Num(n) => *n,
+ TupleNums(n, _m) => *n,
+ StructNums { one, two: _ } => *one,
+ }
+ }
+ }
+
+ impl Foo {
+ fn get_value(&self) -> u8 {
+ let Foo(x) = self;
+ *x
+ }
+
+ fn use_crate(&self) -> u8 {
+ let crate::issue8845::Foo(x) = self;
+ *x
+ }
+ }
+
+ impl Bar {
+ fn get_value(&self) -> u8 {
+ let Bar { x, .. } = self;
+ *x
+ }
+
+ fn use_crate(&self) -> u8 {
+ let crate::issue8845::Bar { x, .. } = self;
+ *x
+ }
+ }
+}
+
+mod issue6902 {
+ use serde::Serialize;
+
+ #[derive(Serialize)]
+ pub enum Foo {
+ Bar = 1,
+ }
+}
++
++fn msrv_1_36() {
++ #![clippy::msrv = "1.36"]
++
++ enum E {
++ A,
++ }
++
++ impl E {
++ fn foo(self) {
++ match self {
++ E::A => {},
++ }
++ }
++ }
++}
++
++fn msrv_1_37() {
++ #![clippy::msrv = "1.37"]
++
++ enum E {
++ A,
++ }
++
++ impl E {
++ fn foo(self) {
++ match self {
++ E::A => {},
++ }
++ }
++ }
++}
--- /dev/null
- --> $DIR/use_self.rs:22:21
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:23:13
++ --> $DIR/use_self.rs:23:21
+ |
+LL | fn new() -> Foo {
+ | ^^^ help: use the applicable keyword: `Self`
+ |
+ = note: `-D clippy::use-self` implied by `-D warnings`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:25:22
++ --> $DIR/use_self.rs:24:13
+ |
+LL | Foo {}
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:26:13
++ --> $DIR/use_self.rs:26:22
+ |
+LL | fn test() -> Foo {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:31:25
++ --> $DIR/use_self.rs:27:13
+ |
+LL | Foo::new()
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:32:13
++ --> $DIR/use_self.rs:32:25
+ |
+LL | fn default() -> Foo {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:97:24
++ --> $DIR/use_self.rs:33:13
+ |
+LL | Foo::new()
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:97:55
++ --> $DIR/use_self.rs:98:24
+ |
+LL | fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:112:13
++ --> $DIR/use_self.rs:98:55
+ |
+LL | fn bad(foos: &[Foo]) -> impl Iterator<Item = &Foo> {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:147:29
++ --> $DIR/use_self.rs:113:13
+ |
+LL | TS(0)
+ | ^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:148:21
++ --> $DIR/use_self.rs:148:29
+ |
+LL | fn bar() -> Bar {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:159:21
++ --> $DIR/use_self.rs:149:21
+ |
+LL | Bar { foo: Foo {} }
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:160:13
++ --> $DIR/use_self.rs:160:21
+ |
+LL | fn baz() -> Foo {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:177:21
++ --> $DIR/use_self.rs:161:13
+ |
+LL | Foo {}
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:178:21
++ --> $DIR/use_self.rs:178:21
+ |
+LL | let _ = Enum::B(42);
+ | ^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:179:21
++ --> $DIR/use_self.rs:179:21
+ |
+LL | let _ = Enum::C { field: true };
+ | ^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:221:13
++ --> $DIR/use_self.rs:180:21
+ |
+LL | let _ = Enum::A;
+ | ^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:222:13
++ --> $DIR/use_self.rs:222:13
+ |
+LL | nested::A::fun_1();
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:224:13
++ --> $DIR/use_self.rs:223:13
+ |
+LL | nested::A::A;
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:243:13
++ --> $DIR/use_self.rs:225:13
+ |
+LL | nested::A {};
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:257:25
++ --> $DIR/use_self.rs:244:13
+ |
+LL | TestStruct::from_something()
+ | ^^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:258:13
++ --> $DIR/use_self.rs:258:25
+ |
+LL | async fn g() -> S {
+ | ^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:262:16
++ --> $DIR/use_self.rs:259:13
+ |
+LL | S {}
+ | ^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:262:22
++ --> $DIR/use_self.rs:263:16
+ |
+LL | &p[S::A..S::B]
+ | ^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:285:29
++ --> $DIR/use_self.rs:263:22
+ |
+LL | &p[S::A..S::B]
+ | ^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:286:13
++ --> $DIR/use_self.rs:286:29
+ |
+LL | fn foo(value: T) -> Foo<T> {
+ | ^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:458:13
++ --> $DIR/use_self.rs:287:13
+ |
+LL | Foo::<T> { value }
+ | ^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:495:13
++ --> $DIR/use_self.rs:459:13
+ |
+LL | A::new::<submod::B>(submod::B {})
+ | ^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:532:17
++ --> $DIR/use_self.rs:496:13
+ |
+LL | S2::new()
+ | ^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:533:17
++ --> $DIR/use_self.rs:533:17
+ |
+LL | Foo::Bar => unimplemented!(),
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:539:20
++ --> $DIR/use_self.rs:534:17
+ |
+LL | Foo::Baz => unimplemented!(),
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:563:17
++ --> $DIR/use_self.rs:540:20
+ |
+LL | if let Foo::Bar = self {
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:564:17
++ --> $DIR/use_self.rs:564:17
+ |
+LL | Something::Num(n) => *n,
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:565:17
++ --> $DIR/use_self.rs:565:17
+ |
+LL | Something::TupleNums(n, _m) => *n,
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:571:17
++ --> $DIR/use_self.rs:566:17
+ |
+LL | Something::StructNums { one, two: _ } => *one,
+ | ^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:572:17
++ --> $DIR/use_self.rs:572:17
+ |
+LL | crate::issue8845::Something::Num(n) => *n,
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:573:17
++ --> $DIR/use_self.rs:573:17
+ |
+LL | crate::issue8845::Something::TupleNums(n, _m) => *n,
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:589:17
++ --> $DIR/use_self.rs:574:17
+ |
+LL | crate::issue8845::Something::StructNums { one, two: _ } => *one,
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:594:17
++ --> $DIR/use_self.rs:590:17
+ |
+LL | let Foo(x) = self;
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:601:17
++ --> $DIR/use_self.rs:595:17
+ |
+LL | let crate::issue8845::Foo(x) = self;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- --> $DIR/use_self.rs:606:17
++ --> $DIR/use_self.rs:602:17
+ |
+LL | let Bar { x, .. } = self;
+ | ^^^ help: use the applicable keyword: `Self`
+
+error: unnecessary structure name repetition
- error: aborting due to 41 previous errors
++ --> $DIR/use_self.rs:607:17
+ |
+LL | let crate::issue8845::Bar { x, .. } = self;
+ | ^^^^^^^^^^^^^^^^^^^^^ help: use the applicable keyword: `Self`
+
++error: unnecessary structure name repetition
++ --> $DIR/use_self.rs:648:17
++ |
++LL | E::A => {},
++ | ^ help: use the applicable keyword: `Self`
++
++error: aborting due to 42 previous errors
+
--- /dev/null
- std::process::Command::new(&rustc)
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+#![allow(clippy::single_match_else)]
+
+use rustc_tools_util::VersionInfo;
+use std::fs;
+
+#[test]
+fn check_that_clippy_lints_and_clippy_utils_have_the_same_version_as_clippy() {
+ fn read_version(path: &str) -> String {
+ let contents = fs::read_to_string(path).unwrap_or_else(|e| panic!("error reading `{path}`: {e:?}"));
+ contents
+ .lines()
+ .filter_map(|l| l.split_once('='))
+ .find_map(|(k, v)| (k.trim() == "version").then(|| v.trim()))
+ .unwrap_or_else(|| panic!("error finding version in `{path}`"))
+ .to_string()
+ }
+
+ // do not run this test inside the upstream rustc repo:
+ // https://github.com/rust-lang/rust-clippy/issues/6683
+ if option_env!("RUSTC_TEST_SUITE").is_some() {
+ return;
+ }
+
+ let clippy_version = read_version("Cargo.toml");
+ let clippy_lints_version = read_version("clippy_lints/Cargo.toml");
+ let clippy_utils_version = read_version("clippy_utils/Cargo.toml");
+
+ assert_eq!(clippy_version, clippy_lints_version);
+ assert_eq!(clippy_version, clippy_utils_version);
+}
+
+#[test]
+fn check_that_clippy_has_the_same_major_version_as_rustc() {
+ // do not run this test inside the upstream rustc repo:
+ // https://github.com/rust-lang/rust-clippy/issues/6683
+ if option_env!("RUSTC_TEST_SUITE").is_some() {
+ return;
+ }
+
+ let clippy_version = rustc_tools_util::get_version_info!();
+ let clippy_major = clippy_version.major;
+ let clippy_minor = clippy_version.minor;
+ let clippy_patch = clippy_version.patch;
+
+ // get the rustc version either from the rustc installed with the toolchain file or from
+ // `RUSTC_REAL` if Clippy is build in the Rust repo with `./x.py`.
+ let rustc = std::env::var("RUSTC_REAL").unwrap_or_else(|_| "rustc".to_string());
+ let rustc_version = String::from_utf8(
++ std::process::Command::new(rustc)
+ .arg("--version")
+ .output()
+ .expect("failed to run `rustc --version`")
+ .stdout,
+ )
+ .unwrap();
+ // extract "1 XX 0" from "rustc 1.XX.0-nightly (<commit> <date>)"
+ let vsplit: Vec<&str> = rustc_version
+ .split(' ')
+ .nth(1)
+ .unwrap()
+ .split('-')
+ .next()
+ .unwrap()
+ .split('.')
+ .collect();
+ match vsplit.as_slice() {
+ [rustc_major, rustc_minor, _rustc_patch] => {
+ // clippy 0.1.XX should correspond to rustc 1.XX.0
+ assert_eq!(clippy_major, 0); // this will probably stay the same for a long time
+ assert_eq!(
+ clippy_minor.to_string(),
+ *rustc_major,
+ "clippy minor version does not equal rustc major version"
+ );
+ assert_eq!(
+ clippy_patch.to_string(),
+ *rustc_minor,
+ "clippy patch version does not equal rustc minor version"
+ );
+ // do not check rustc_patch because when a stable-patch-release is made (like 1.50.2),
+ // we don't want our tests failing suddenly
+ },
+ _ => {
+ panic!("Failed to parse rustc version: {vsplit:?}");
+ },
+ };
+}
--- /dev/null
+<!DOCTYPE html>
+<!--
+Welcome to a Clippy's lint list, at least the source code of it. If you are
+interested in contributing to this website checkout `util/gh-pages/index.html`
+inside the rust-clippy repository.
+
+Otherwise, have a great day =^.^=
+-->
+<html lang="en">
+<head>
+ <meta charset="UTF-8"/>
+ <meta name="viewport" content="width=device-width, initial-scale=1"/>
+ <meta name="description" content="A collection of lints to catch common mistakes and improve your Rust code.">
+
+ <title>Clippy Lints</title>
+
+ <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.min.css"/>
+ <link id="githubLightHighlight" rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/styles/github.min.css" disabled="true" />
+ <link id="githubDarkHighlight" rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/styles/github-dark.min.css" disabled="true" />
+
+ <!-- The files are not copied over into the Clippy project since they use the MPL-2.0 License -->
+ <link rel="stylesheet" href="https://rust-lang.github.io/mdBook/css/variables.css"/>
+ <link id="styleHighlight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/highlight.css">
+ <link id="styleNight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/tomorrow-night.css" disabled="true">
+ <link id="styleAyu" rel="stylesheet" href="https://rust-lang.github.io/mdBook/ayu-highlight.css" disabled="true">
+ <style>
+ blockquote { font-size: 1em; }
+ [ng\:cloak], [ng-cloak], [data-ng-cloak], [x-ng-cloak], .ng-cloak, .x-ng-cloak { display: none !important; }
+
+ .dropdown-menu {
+ color: var(--fg);
+ background: var(--theme-popup-bg);
+ border: 1px solid var(--theme-popup-border);
+ }
+
+ .dropdown-menu .divider {
+ background-color: var(--theme-popup-border);
+ }
+
+ .dropdown-menu .checkbox {
+ display: block;
+ white-space: nowrap;
+ margin: 0;
+ }
+ .dropdown-menu .checkbox label {
+ padding: 3px 20px;
+ width: 100%;
+ }
+
+ .dropdown-menu .checkbox input {
+ position: relative;
+ margin: 0 0.5rem 0;
+ padding: 0;
+ }
+
+ .dropdown-menu .checkbox:hover {
+ background-color: var(--theme-hover);
+ }
+
+ div.panel div.panel-body button.dropdown-toggle {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ }
+
+ div.panel div.panel-body button.dropdown-toggle:hover {
+ box-shadow: 0 0 3px var(--searchbar-shadow-color);
+ }
+
+ div.panel div.panel-body .open button.dropdown-toggle {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ filter: brightness(90%);
+ }
+
+ .dropdown-toggle .badge {
+ background-color: #777;
+ }
+
+ .panel-heading { cursor: pointer; }
+
+ .panel-title { display: flex; flex-wrap: wrap;}
+ .panel-title .label { display: inline-block; }
+
+ .panel-title-name { flex: 1; min-width: 400px;}
+ .panel-title-name span { vertical-align: bottom; }
+
+ .panel .panel-title-name .anchor { display: none; }
+ .panel:hover .panel-title-name .anchor { display: inline;}
+
+ .search-control {
+ margin-top: 15px;
+ }
+
+ @media (min-width: 992px) {
+ .search-control {
+ margin-top: 0;
+ float: right;
+ }
+ }
+
+ @media (min-width: 405px) {
+ #upper-filters {
+ display: flex;
+ }
+ }
+
+ @media (max-width: 430px) {
+ /* Turn the version filter list to the left */
+ #version-filter-selector {
+ right: 0;
+ left: auto;
+ }
+ }
+
+ @media (max-width: 412px) {
+ #upper-filters,
+ .panel-body .search-control {
+ padding-right: 8px;
+ padding-left: 8px;
+ }
+ }
+
+ .label {
+ padding-top: 0.3em;
+ padding-bottom: 0.3em;
+ }
+
+ .label-lint-group {
+ min-width: 8em;
+ }
+ .label-lint-level {
+ min-width: 4em;
+ }
+
+ .label-lint-level-allow {
+ background-color: #5cb85c;
+ }
+ .label-lint-level-warn {
+ background-color: #f0ad4e;
+ }
+ .label-lint-level-deny {
+ background-color: #d9534f;
+ }
+ .label-lint-level-none {
+ background-color: #777777;
+ opacity: 0.5;
+ }
+
+ .label-group-deprecated {
+ opacity: 0.5;
+ }
+
+ .label-doc-folding {
+ color: #000;
+ background-color: #fff;
+ border: 1px solid var(--theme-popup-border);
+ }
+ .label-doc-folding:hover {
+ background-color: #e6e6e6;
+ }
+
+ .lint-doc-md > h3 {
+ border-top: 1px solid var(--theme-popup-border);
+ padding: 10px 15px;
+ margin: 0 -15px;
+ font-size: 18px;
+ }
+ .lint-doc-md > h3:first-child {
+ border-top: none;
+ padding-top: 0px;
+ }
+
+ @media (max-width:749px) {
+ .lint-additional-info-container {
+ display: flex;
+ flex-flow: column;
+ }
+ .lint-additional-info-item + .lint-additional-info-item {
+ border-top: 1px solid var(--theme-popup-border);
+ }
+ }
+ @media (min-width:750px) {
+ .lint-additional-info-container {
+ display: flex;
+ flex-flow: row;
+ }
+ .lint-additional-info-item + .lint-additional-info-item {
+ border-left: 1px solid var(--theme-popup-border);
+ }
+ }
+
+ .lint-additional-info-item {
+ display: inline-flex;
+ min-width: 200px;
+ flex-grow: 1;
+ padding: 9px 5px 5px 15px;
+ }
+
+ .label-applicability {
+ background-color: #777777;
+ margin: auto 5px;
+ }
+
+ .label-version {
+ background-color: #777777;
+ margin: auto 5px;
+ font-family: monospace;
+ }
+
+ details {
+ border-radius: 4px;
+ padding: .5em .5em 0;
+ }
+
+ code {
+ white-space: pre !important;
+ }
+
+ summary {
+ font-weight: bold;
+ margin: -.5em -.5em 0;
+ padding: .5em;
+ display: revert;
+ }
+
+ details[open] {
+ padding: .5em;
+ }
+ </style>
+ <style>
+ /* Expanding the mdBoom theme*/
+ .light {
+ --inline-code-bg: #f6f7f6;
+ }
+ .rust {
+ --inline-code-bg: #f6f7f6;
+ }
+ .coal {
+ --inline-code-bg: #1d1f21;
+ }
+ .navy {
+ --inline-code-bg: #1d1f21;
+ }
+ .ayu {
+ --inline-code-bg: #191f26;
+ }
+
+ .theme-dropdown {
+ position: absolute;
+ margin: 0.7em;
+ z-index: 10;
+ }
+
+ /* Applying the mdBook theme */
+ .theme-icon {
+ text-align: center;
+ width: 2em;
+ height: 2em;
+ line-height: 2em;
+ border: solid 1px var(--icons);
+ border-radius: 5px;
+ user-select: none;
+ cursor: pointer;
+ }
+ .theme-icon:hover {
+ background: var(--theme-hover);
+ }
+ .theme-choice {
+ display: none;
+ list-style: none;
+ border: 1px solid var(--theme-popup-border);
+ border-radius: 5px;
+ color: var(--fg);
+ background: var(--theme-popup-bg);
+ padding: 0 0;
+ overflow: hidden;
+ }
+
+ .theme-dropdown.open .theme-choice {
+ display: block;
+ }
+
+ .theme-choice > li {
+ padding: 5px 10px;
+ font-size: 0.8em;
+ user-select: none;
+ cursor: pointer;
+ }
+
+ .theme-choice > li:hover {
+ background: var(--theme-hover);
+ }
+
+ .alert {
+ color: var(--fg);
+ background: var(--theme-hover);
+ border: 1px solid var(--theme-popup-border);
+ }
+ .page-header {
+ border-color: var(--theme-popup-border);
+ }
+ .panel-default > .panel-heading {
+ background: var(--theme-hover);
+ color: var(--fg);
+ border: 1px solid var(--theme-popup-border);
+ }
+ .panel-default > .panel-heading:hover {
+ filter: brightness(90%);
+ }
+ .list-group-item {
+ background: 0%;
+ border: 1px solid var(--theme-popup-border);
+ }
+ .panel, pre, hr {
+ background: var(--bg);
+ border: 1px solid var(--theme-popup-border);
+ }
+
+ #version-filter-selector .checkbox {
+ display: flex;
+ }
+
+ #version-filter {
+ min-width: available;
+ }
+
+ #version-filter li label {
+ padding-right: 0;
+ width: 35%;
+ }
+
+ .version-filter-input {
+ height: 60%;
+ width: 30%;
+ text-align: center;
+ border: none;
+ border-bottom: 1px solid #000000;
+ }
+
+ #filter-label, .filter-clear {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ filter: brightness(95%);
+ }
+ #filter-label:hover, .filter-clear:hover {
+ filter: brightness(90%);
+ }
+ .filter-input {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ }
+
+ .filter-input::-webkit-input-placeholder,
+ .filter-input::-moz-placeholder {
+ color: var(--searchbar-fg);
+ opacity: 30%;
+ }
+
+ :not(pre) > code {
+ color: var(--inline-code-color);
+ background-color: var(--inline-code-bg);
+ }
+ html {
+ scrollbar-color: var(--scrollbar) var(--bg);
+ }
+ body {
+ background: var(--bg);
+ color: var(--fg);
+ }
+
+ </style>
+</head>
+<body ng-app="clippy" ng-controller="lintList">
+ <div theme-dropdown class="theme-dropdown">
+ <div id="theme-icon" class="theme-icon">🖌</div>
+ <ul id="theme-menu" class="theme-choice">
+ <li id="{{id}}" ng-repeat="(id, name) in themes" ng-click="selectTheme(id)">{{name}}</li>
+ </ul>
+ </div>
+
+ <div class="container">
+ <div class="page-header">
+ <h1>Clippy Lints</h1>
+ </div>
+
+ <noscript>
+ <div class="alert alert-danger" role="alert">
+ Sorry, this site only works with JavaScript! :(
+ </div>
+ </noscript>
+
+ <div ng-cloak>
+
+ <div class="alert alert-info" role="alert" ng-if="loading">
+ Loading…
+ </div>
+ <div class="alert alert-danger" role="alert" ng-if="error">
+ Error loading lints!
+ </div>
+
+ <div class="panel panel-default" ng-show="data">
+ <div class="panel-body row">
+ <div id="upper-filters" class="col-12 col-md-4">
+ <div class="btn-group" filter-dropdown>
+ <button type="button" class="btn btn-default dropdown-toggle">
+ Lint levels <span class="badge">{{selectedValuesCount(levels)}}</span> <span class="caret"></span>
+ </button>
+ <ul class="dropdown-menu">
+ <li class="checkbox">
+ <label ng-click="toggleLevels(true)">
+ <input type="checkbox" class="invisible" />
+ All
+ </label>
+ </li>
+ <li class="checkbox">
+ <label ng-click="toggleLevels(false)">
+ <input type="checkbox" class="invisible" />
+ None
+ </label>
+ </li>
+ <li role="separator" class="divider"></li>
+ <li class="checkbox" ng-repeat="(level, enabled) in levels">
+ <label class="text-capitalize">
+ <input type="checkbox" ng-model="levels[level]" />
+ {{level}}
+ </label>
+ </li>
+ </ul>
+ </div>
+ <div class="btn-group" filter-dropdown>
+ <button type="button" class="btn btn-default dropdown-toggle">
+ Lint groups <span class="badge">{{selectedValuesCount(groups)}}</span> <span class="caret"></span>
+ </button>
+ <ul class="dropdown-menu">
+ <li class="checkbox">
+ <label ng-click="toggleGroups(true)">
+ <input type="checkbox" class="invisible" />
+ All
+ </label>
+ </li>
++ <li class="checkbox">
++ <label ng-click="resetGroupsToDefault()">
++ <input type="checkbox" class="invisible" />
++ Default
++ </label>
++ </li>
+ <li class="checkbox">
+ <label ng-click="toggleGroups(false)">
+ <input type="checkbox" class="invisible" />
+ None
+ </label>
+ </li>
+ <li role="separator" class="divider"></li>
+ <li class="checkbox" ng-repeat="(group, enabled) in groups">
+ <label class="text-capitalize">
+ <input type="checkbox" ng-model="groups[group]" />
+ {{group}}
+ </label>
+ </li>
+ </ul>
+ </div>
+ <div id="version-filter">
+ <div class="btn-group" filter-dropdown>
+ <button type="button" class="btn btn-default dropdown-toggle">
+ Version
+ <span id="version-filter-count" class="badge">
+ {{versionFilterCount(versionFilters)}}
+ </span>
+ <span class="caret"></span>
+ </button>
+ <ul id="version-filter-selector" class="dropdown-menu">
+ <li class="checkbox">
+ <label ng-click="clearVersionFilters()">
+ <input type="checkbox" class="invisible" />
+ Clear filters
+ </label>
+ </li>
+ <li role="separator" class="divider"></li>
+ <li class="checkbox" ng-repeat="(filter, vars) in versionFilters">
+ <label ng-attr-for="filter-{filter}">{{filter}}</label>
+ <span>1.</span>
+ <input type="number"
+ min="29"
+ ng-attr-id="filter-{filter}"
+ class="version-filter-input form-control filter-input"
+ maxlength="2"
+ ng-model="versionFilters[filter].minorVersion"
+ ng-model-options="{debounce: 50}"
+ ng-change="updateVersionFilters()" />
+ <span>.0</span>
+ </li>
+ </ul>
+ </div>
+ </div>
+
+ </div>
+ <div class="col-12 col-md-7 search-control">
+ <div class="input-group">
+ <label class="input-group-addon" id="filter-label" for="search-input">Filter:</label>
+ <input type="text" class="form-control filter-input" placeholder="Keywords or search string" id="search-input" ng-model="search" ng-model-options="{debounce: 50}"/>
+ <span class="input-group-btn">
+ <button class="filter-clear btn" type="button" ng-click="search = ''">
+ Clear
+ </button>
+ </span>
+ </div>
+ </div>
+ </div>
+ </div>
+ <!-- The order of the filters should be from most likely to remove a lint to least likely to improve performance. -->
+ <article class="panel panel-default" id="{{lint.id}}" ng-repeat="lint in data | filter:bySearch | filter:byGroups | filter:byLevels | filter:byVersion">
+ <header class="panel-heading" ng-click="open[lint.id] = !open[lint.id]">
+ <h2 class="panel-title">
+ <div class="panel-title-name">
+ <span>{{lint.id}}</span>
+ <a href="#{{lint.id}}" class="anchor label label-default" ng-click="open[lint.id] = true; $event.stopPropagation()">¶</a>
+ <a href="" id="clipboard-{{lint.id}}" class="anchor label label-default" ng-click="copyToClipboard(lint); $event.stopPropagation()">
+ 📋
+ </a>
+ </div>
+
+ <div class="panel-title-addons">
+ <span class="label label-lint-group label-default label-group-{{lint.group}}">{{lint.group}}</span>
+
+ <span class="label label-lint-level label-lint-level-{{lint.level}}">{{lint.level}}</span>
+
+
+ <span class="label label-doc-folding" ng-show="open[lint.id]">−</span>
+ <span class="label label-doc-folding" ng-hide="open[lint.id]">+</span>
+ </div>
+ </h2>
+ </header>
+
+ <div class="list-group lint-docs" ng-if="open[lint.id]" ng-class="{collapse: true, in: open[lint.id]}">
+ <div class="list-group-item lint-doc-md" ng-bind-html="lint.docs | markdown"></div>
+ <div class="lint-additional-info-container">
+ <!-- Applicability -->
+ <div class="lint-additional-info-item">
+ <span> Applicability: </span>
+ <span class="label label-default label-applicability">{{lint.applicability.applicability}}</span>
+ <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint_defs/enum.Applicability.html#variants">(?)</a>
+ </div>
+ <!-- Clippy version -->
+ <div class="lint-additional-info-item">
+ <span>{{lint.group == "deprecated" ? "Deprecated" : "Added"}} in: </span>
+ <span class="label label-default label-version">{{lint.version}}</span>
+ </div>
+ <!-- Open related issues -->
+ <div class="lint-additional-info-item">
+ <a href="https://github.com/rust-lang/rust-clippy/issues?q=is%3Aissue+{{lint.id}}">Related Issues</a>
+ </div>
+ <!-- Jump to source -->
+ <div class="lint-additional-info-item">
+ <a href="https://github.com/rust-lang/rust-clippy/blob/{{docVersion}}/clippy_lints/{{lint.id_span.path}}#L{{lint.id_span.line}}">View Source</a>
+ </div>
+ </div>
+ </div>
+ </article>
+ </div>
+ </div>
+
+ <a href="https://github.com/rust-lang/rust-clippy">
+ <img style="position: absolute; top: 0; right: 0; border: 0; clip-path: polygon(0% 0%, 100% 0%, 100% 100%);" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on Github"/>
+ </a>
+
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/markdown-it/12.3.2/markdown-it.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/highlight.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.6.0/languages/rust.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.12/angular.min.js"></script>
+ <script src="script.js"></script>
+</body>
+</html>
--- /dev/null
- var GROUPS_FILTER_DEFAULT = {
+(function () {
+ var md = window.markdownit({
+ html: true,
+ linkify: true,
+ typographer: true,
+ highlight: function (str, lang) {
+ if (lang && hljs.getLanguage(lang)) {
+ try {
+ return '<pre class="hljs"><code>' +
+ hljs.highlight(str, { language: lang, ignoreIllegals: true }).value +
+ '</code></pre>';
+ } catch (__) {}
+ }
+
+ return '<pre class="hljs"><code>' + md.utils.escapeHtml(str) + '</code></pre>';
+ }
+ });
+
+ function scrollToLint(lintId) {
+ var target = document.getElementById(lintId);
+ if (!target) {
+ return;
+ }
+ target.scrollIntoView();
+ }
+
+ function scrollToLintByURL($scope) {
+ var removeListener = $scope.$on('ngRepeatFinished', function(ngRepeatFinishedEvent) {
+ scrollToLint(window.location.hash.slice(1));
+ removeListener();
+ });
+ }
+
+ function selectGroup($scope, selectedGroup) {
+ var groups = $scope.groups;
+ for (var group in groups) {
+ if (groups.hasOwnProperty(group)) {
+ if (group === selectedGroup) {
+ groups[group] = true;
+ } else {
+ groups[group] = false;
+ }
+ }
+ }
+ }
+
+ angular.module("clippy", [])
+ .filter('markdown', function ($sce) {
+ return function (text) {
+ return $sce.trustAsHtml(
+ md.render(text || '')
+ // Oh deer, what a hack :O
+ .replace('<table', '<table class="table"')
+ );
+ };
+ })
+ .directive('themeDropdown', function ($document) {
+ return {
+ restrict: 'A',
+ link: function ($scope, $element, $attr) {
+ $element.bind('click', function () {
+ $element.toggleClass('open');
+ $element.addClass('open-recent');
+ });
+
+ $document.bind('click', function () {
+ if (!$element.hasClass('open-recent')) {
+ $element.removeClass('open');
+ }
+ $element.removeClass('open-recent');
+ })
+ }
+ }
+ })
+ .directive('filterDropdown', function ($document) {
+ return {
+ restrict: 'A',
+ link: function ($scope, $element, $attr) {
+ $element.bind('click', function (event) {
+ if (event.target.closest('button')) {
+ $element.toggleClass('open');
+ } else {
+ $element.addClass('open');
+ }
+ $element.addClass('open-recent');
+ });
+
+ $document.bind('click', function () {
+ if (!$element.hasClass('open-recent')) {
+ $element.removeClass('open');
+ }
+ $element.removeClass('open-recent');
+ })
+ }
+ }
+ })
+ .directive('onFinishRender', function ($timeout) {
+ return {
+ restrict: 'A',
+ link: function (scope, element, attr) {
+ if (scope.$last === true) {
+ $timeout(function () {
+ scope.$emit(attr.onFinishRender);
+ });
+ }
+ }
+ };
+ })
+ .controller("lintList", function ($scope, $http, $timeout) {
+ // Level filter
+ var LEVEL_FILTERS_DEFAULT = {allow: true, warn: true, deny: true, none: true};
+ $scope.levels = LEVEL_FILTERS_DEFAULT;
+ $scope.byLevels = function (lint) {
+ return $scope.levels[lint.level];
+ };
+
- $scope.groups = GROUPS_FILTER_DEFAULT;
++ const GROUPS_FILTER_DEFAULT = {
+ cargo: true,
+ complexity: true,
+ correctness: true,
+ deprecated: false,
+ nursery: true,
+ pedantic: true,
+ perf: true,
+ restriction: true,
+ style: true,
+ suspicious: true,
++ }
++
++ $scope.groups = {
++ ...GROUPS_FILTER_DEFAULT
+ };
++
+ const THEMES_DEFAULT = {
+ light: "Light",
+ rust: "Rust",
+ coal: "Coal",
+ navy: "Navy",
+ ayu: "Ayu"
+ };
+ $scope.themes = THEMES_DEFAULT;
+
+ $scope.versionFilters = {
+ "≥": {enabled: false, minorVersion: null },
+ "≤": {enabled: false, minorVersion: null },
+ "=": {enabled: false, minorVersion: null },
+ };
+
+ $scope.selectTheme = function (theme) {
+ setTheme(theme, true);
+ }
+
+ $scope.toggleLevels = function (value) {
+ const levels = $scope.levels;
+ for (const key in levels) {
+ if (levels.hasOwnProperty(key)) {
+ levels[key] = value;
+ }
+ }
+ };
+
+ $scope.toggleGroups = function (value) {
+ const groups = $scope.groups;
+ for (const key in groups) {
+ if (groups.hasOwnProperty(key)) {
+ groups[key] = value;
+ }
+ }
+ };
++
++ $scope.resetGroupsToDefault = function () {
++ const groups = $scope.groups;
++ for (const [key, value] of Object.entries(GROUPS_FILTER_DEFAULT)) {
++ groups[key] = value;
++ }
++ };
+
+ $scope.selectedValuesCount = function (obj) {
+ return Object.values(obj).filter(x => x).length;
+ }
+
+ $scope.clearVersionFilters = function () {
+ for (let filter in $scope.versionFilters) {
+ $scope.versionFilters[filter] = { enabled: false, minorVersion: null };
+ }
+ }
+
+ $scope.versionFilterCount = function(obj) {
+ return Object.values(obj).filter(x => x.enabled).length;
+ }
+
+ $scope.updateVersionFilters = function() {
+ for (const filter in $scope.versionFilters) {
+ let minorVersion = $scope.versionFilters[filter].minorVersion;
+
+ // 1.29.0 and greater
+ if (minorVersion && minorVersion > 28) {
+ $scope.versionFilters[filter].enabled = true;
+ continue;
+ }
+
+ $scope.versionFilters[filter].enabled = false;
+ }
+ }
+
+ $scope.byVersion = function(lint) {
+ let filters = $scope.versionFilters;
+ for (const filter in filters) {
+ if (filters[filter].enabled) {
+ let minorVersion = filters[filter].minorVersion;
+
+ // Strip the "pre " prefix for pre 1.29.0 lints
+ let lintVersion = lint.version.startsWith("pre ") ? lint.version.substring(4, lint.version.length) : lint.version;
+ let lintMinorVersion = lintVersion.substring(2, 4);
+
+ switch (filter) {
+ // "=" gets the highest priority, since all filters are inclusive
+ case "=":
+ return (lintMinorVersion == minorVersion);
+ case "≥":
+ if (lintMinorVersion < minorVersion) { return false; }
+ break;
+ case "≤":
+ if (lintMinorVersion > minorVersion) { return false; }
+ break;
+ default:
+ return true
+ }
+ }
+ }
+
+ return true;
+ }
+
+ $scope.byGroups = function (lint) {
+ return $scope.groups[lint.group];
+ };
+
+ $scope.bySearch = function (lint, index, array) {
+ let searchStr = $scope.search;
+ // It can be `null` I haven't missed this value
+ if (searchStr == null || searchStr.length < 3) {
+ return true;
+ }
+ searchStr = searchStr.toLowerCase();
+ if (searchStr.startsWith("clippy::")) {
+ searchStr = searchStr.slice(8);
+ }
+
+ // Search by id
+ if (lint.id.indexOf(searchStr.replace("-", "_")) !== -1) {
+ return true;
+ }
+
+ // Search the description
+ // The use of `for`-loops instead of `foreach` enables us to return early
+ let terms = searchStr.split(" ");
+ let docsLowerCase = lint.docs.toLowerCase();
+ for (index = 0; index < terms.length; index++) {
+ // This is more likely and will therefor be checked first
+ if (docsLowerCase.indexOf(terms[index]) !== -1) {
+ continue;
+ }
+
+ if (lint.id.indexOf(terms[index]) !== -1) {
+ continue;
+ }
+
+ return false;
+ }
+
+ return true;
+ }
+
+ $scope.copyToClipboard = function (lint) {
+ const clipboard = document.getElementById("clipboard-" + lint.id);
+ if (clipboard) {
+ let resetClipboardTimeout = null;
+ let resetClipboardIcon = clipboard.innerHTML;
+
+ function resetClipboard() {
+ resetClipboardTimeout = null;
+ clipboard.innerHTML = resetClipboardIcon;
+ }
+
+ navigator.clipboard.writeText("clippy::" + lint.id);
+
+ clipboard.innerHTML = "✓";
+ if (resetClipboardTimeout !== null) {
+ clearTimeout(resetClipboardTimeout);
+ }
+ resetClipboardTimeout = setTimeout(resetClipboard, 1000);
+ }
+ }
+
+ // Get data
+ $scope.open = {};
+ $scope.loading = true;
+ // This will be used to jump into the source code of the version that this documentation is for.
+ $scope.docVersion = window.location.pathname.split('/')[2] || "master";
+
+ if (window.location.hash.length > 1) {
+ $scope.search = window.location.hash.slice(1);
+ $scope.open[window.location.hash.slice(1)] = true;
+ scrollToLintByURL($scope);
+ }
+
+ $http.get('./lints.json')
+ .success(function (data) {
+ $scope.data = data;
+ $scope.loading = false;
+
+ var selectedGroup = getQueryVariable("sel");
+ if (selectedGroup) {
+ selectGroup($scope, selectedGroup.toLowerCase());
+ }
+
+ scrollToLintByURL($scope);
+
+ setTimeout(function () {
+ var el = document.getElementById('filter-input');
+ if (el) { el.focus() }
+ }, 0);
+ })
+ .error(function (data) {
+ $scope.error = data;
+ $scope.loading = false;
+ });
+
+ window.addEventListener('hashchange', function () {
+ // trigger re-render
+ $timeout(function () {
+ $scope.levels = LEVEL_FILTERS_DEFAULT;
+ $scope.search = window.location.hash.slice(1);
+ $scope.open[window.location.hash.slice(1)] = true;
+
+ scrollToLintByURL($scope);
+ });
+ return true;
+ }, false);
+ });
+})();
+
+function getQueryVariable(variable) {
+ var query = window.location.search.substring(1);
+ var vars = query.split('&');
+ for (var i = 0; i < vars.length; i++) {
+ var pair = vars[i].split('=');
+ if (decodeURIComponent(pair[0]) == variable) {
+ return decodeURIComponent(pair[1]);
+ }
+ }
+}
+
+function setTheme(theme, store) {
+ let enableHighlight = false;
+ let enableNight = false;
+ let enableAyu = false;
+
+ switch(theme) {
+ case "ayu":
+ enableAyu = true;
+ break;
+ case "coal":
+ case "navy":
+ enableNight = true;
+ break;
+ case "rust":
+ enableHighlight = true;
+ break;
+ default:
+ enableHighlight = true;
+ theme = "light";
+ break;
+ }
+
+ document.getElementsByTagName("body")[0].className = theme;
+
+ document.getElementById("githubLightHighlight").disabled = enableNight || !enableHighlight;
+ document.getElementById("githubDarkHighlight").disabled = !enableNight && !enableAyu;
+
+ document.getElementById("styleHighlight").disabled = !enableHighlight;
+ document.getElementById("styleNight").disabled = !enableNight;
+ document.getElementById("styleAyu").disabled = !enableAyu;
+
+ if (store) {
+ try {
+ localStorage.setItem('clippy-lint-list-theme', theme);
+ } catch (e) { }
+ }
+}
+
+// loading the theme after the initial load
+const prefersDark = window.matchMedia("(prefers-color-scheme: dark)");
+const theme = localStorage.getItem('clippy-lint-list-theme');
+if (prefersDark.matches && !theme) {
+ setTheme("coal", false);
+} else {
+ setTheme(theme, false);
+}
projects / rust.git / commitdiff