--- /dev/null
- - 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: 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+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master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+ - uses: rust-lang/simpleinfra/github-actions/cancel-outdated-builds@master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: 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
- [b52fb523...master](https://github.com/rust-lang/rust-clippy/compare/b52fb523...master)
+# 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 / Beta / In Rust Nightly
+
- Current stable, released 2022-11-03
++[4f142aa1...master](https://github.com/rust-lang/rust-clippy/compare/4f142aa1...master)
++
++## Rust 1.66
++
++Current stable, released 2022-12-15
++
++[b52fb523...4f142aa1](https://github.com/rust-lang/rust-clippy/compare/b52fb523...4f142aa1)
++
++### New Lints
++
++* [`manual_clamp`]
++ [#9484](https://github.com/rust-lang/rust-clippy/pull/9484)
++* [`missing_trait_methods`]
++ [#9670](https://github.com/rust-lang/rust-clippy/pull/9670)
++* [`unused_format_specs`]
++ [#9637](https://github.com/rust-lang/rust-clippy/pull/9637)
++* [`iter_kv_map`]
++ [#9409](https://github.com/rust-lang/rust-clippy/pull/9409)
++* [`manual_filter`]
++ [#9451](https://github.com/rust-lang/rust-clippy/pull/9451)
++* [`box_default`]
++ [#9511](https://github.com/rust-lang/rust-clippy/pull/9511)
++* [`implicit_saturating_add`]
++ [#9549](https://github.com/rust-lang/rust-clippy/pull/9549)
++* [`as_ptr_cast_mut`]
++ [#9572](https://github.com/rust-lang/rust-clippy/pull/9572)
++* [`disallowed_macros`]
++ [#9495](https://github.com/rust-lang/rust-clippy/pull/9495)
++* [`partial_pub_fields`]
++ [#9658](https://github.com/rust-lang/rust-clippy/pull/9658)
++* [`uninlined_format_args`]
++ [#9233](https://github.com/rust-lang/rust-clippy/pull/9233)
++* [`cast_nan_to_int`]
++ [#9617](https://github.com/rust-lang/rust-clippy/pull/9617)
++
++### Moves and Deprecations
++
++* `positional_named_format_parameters` was uplifted to rustc under the new name
++ `named_arguments_used_positionally`
++ [#8518](https://github.com/rust-lang/rust-clippy/pull/8518)
++* Moved [`implicit_saturating_sub`] to `style` (Now warn-by-default)
++ [#9584](https://github.com/rust-lang/rust-clippy/pull/9584)
++* Moved `derive_partial_eq_without_eq` to `nursery` (now allow-by-default)
++ [#9536](https://github.com/rust-lang/rust-clippy/pull/9536)
++
++### Enhancements
++
++* [`nonstandard_macro_braces`]: Now includes `matches!()` in the default lint config
++ [#9471](https://github.com/rust-lang/rust-clippy/pull/9471)
++* [`suboptimal_flops`]: Now supports multiplication and subtraction operations
++ [#9581](https://github.com/rust-lang/rust-clippy/pull/9581)
++* [`arithmetic_side_effects`]: Now detects cases with literals behind references
++ [#9587](https://github.com/rust-lang/rust-clippy/pull/9587)
++* [`upper_case_acronyms`]: Now also checks enum names
++ [#9580](https://github.com/rust-lang/rust-clippy/pull/9580)
++* [`needless_borrowed_reference`]: Now lints nested patterns
++ [#9573](https://github.com/rust-lang/rust-clippy/pull/9573)
++* [`unnecessary_cast`]: Now works for non-trivial non-literal expressions
++ [#9576](https://github.com/rust-lang/rust-clippy/pull/9576)
++* [`arithmetic_side_effects`]: Now detects operations with custom types
++ [#9559](https://github.com/rust-lang/rust-clippy/pull/9559)
++* [`disallowed_methods`], [`disallowed_types`]: Not correctly lints types, functions and macros
++ with the same path
++ [#9495](https://github.com/rust-lang/rust-clippy/pull/9495)
++* [`self_named_module_files`], [`mod_module_files`]: Now take remapped path prefixes into account
++ [#9475](https://github.com/rust-lang/rust-clippy/pull/9475)
++* [`bool_to_int_with_if`]: Now detects the inverse if case
++ [#9476](https://github.com/rust-lang/rust-clippy/pull/9476)
++
++### False Positive Fixes
++
++* [`arithmetic_side_effects`]: Now allows operations that can't overflow
++ [#9474](https://github.com/rust-lang/rust-clippy/pull/9474)
++* [`unnecessary_lazy_evaluations`]: No longer lints in external macros
++ [#9486](https://github.com/rust-lang/rust-clippy/pull/9486)
++* [`needless_borrow`], [`explicit_auto_deref`]: No longer lint on unions that require the reference
++ [#9490](https://github.com/rust-lang/rust-clippy/pull/9490)
++* [`almost_complete_letter_range`]: No longer lints in external macros
++ [#9467](https://github.com/rust-lang/rust-clippy/pull/9467)
++* [`drop_copy`]: No longer lints on idiomatic cases in match arms
++ [#9491](https://github.com/rust-lang/rust-clippy/pull/9491)
++* [`question_mark`]: No longer lints in const context
++ [#9487](https://github.com/rust-lang/rust-clippy/pull/9487)
++* [`collapsible_if`]: Suggestion now work in macros
++ [#9410](https://github.com/rust-lang/rust-clippy/pull/9410)
++* [`std_instead_of_core`]: No longer triggers on unstable modules
++ [#9545](https://github.com/rust-lang/rust-clippy/pull/9545)
++* [`unused_peekable`]: No longer lints, if the peak is done in a closure or function
++ [#9465](https://github.com/rust-lang/rust-clippy/pull/9465)
++* [`useless_attribute`]: No longer lints on `#[allow]` attributes for [`unsafe_removed_from_name`]
++ [#9593](https://github.com/rust-lang/rust-clippy/pull/9593)
++* [`unnecessary_lazy_evaluations`]: No longer suggest switching to early evaluation when type has
++ custom `Drop` implementation
++ [#9551](https://github.com/rust-lang/rust-clippy/pull/9551)
++* [`unnecessary_cast`]: No longer lints on negative hexadecimal literals when cast as floats
++ [#9609](https://github.com/rust-lang/rust-clippy/pull/9609)
++* [`use_self`]: No longer lints in proc macros
++ [#9454](https://github.com/rust-lang/rust-clippy/pull/9454)
++* [`never_loop`]: Now takes `let ... else` statements into consideration.
++ [#9496](https://github.com/rust-lang/rust-clippy/pull/9496)
++* [`default_numeric_fallback`]: Now ignores constants
++ [#9636](https://github.com/rust-lang/rust-clippy/pull/9636)
++* [`uninit_vec`]: No longer lints `Vec::set_len(0)`
++ [#9519](https://github.com/rust-lang/rust-clippy/pull/9519)
++* [`arithmetic_side_effects`]: Now ignores references to integer types
++ [#9507](https://github.com/rust-lang/rust-clippy/pull/9507)
++* [`large_stack_arrays`]: No longer lints inside static items
++ [#9466](https://github.com/rust-lang/rust-clippy/pull/9466)
++* [`ref_option_ref`]: No longer lints if the inner reference is mutable
++ [#9684](https://github.com/rust-lang/rust-clippy/pull/9684)
++* [`ptr_arg`]: No longer lints if the argument is used as an incomplete trait object
++ [#9645](https://github.com/rust-lang/rust-clippy/pull/9645)
++* [`should_implement_trait`]: Now also works for `default` methods
++ [#9546](https://github.com/rust-lang/rust-clippy/pull/9546)
++
++### Suggestion Fixes/Improvements
++
++* [`derivable_impls`]: The suggestion is now machine applicable
++ [#9429](https://github.com/rust-lang/rust-clippy/pull/9429)
++* [`match_single_binding`]: The suggestion now handles scrutinies with side effects better
++ [#9601](https://github.com/rust-lang/rust-clippy/pull/9601)
++* [`zero_prefixed_literal`]: Only suggests using octal numbers, if this is possible
++ [#9652](https://github.com/rust-lang/rust-clippy/pull/9652)
++* [`rc_buffer`]: The suggestion is no longer machine applicable to avoid semantic changes
++ [#9633](https://github.com/rust-lang/rust-clippy/pull/9633)
++* [`print_literal`], [`write_literal`], [`uninlined_format_args`]: The suggestion now ignores
++ comments after the macro call.
++ [#9586](https://github.com/rust-lang/rust-clippy/pull/9586)
++* [`expect_fun_call`]:Improved the suggestion for `format!` calls with captured variables
++ [#9586](https://github.com/rust-lang/rust-clippy/pull/9586)
++* [`nonstandard_macro_braces`]: The suggestion is now machine applicable and will no longer
++ replace brackets inside the macro argument.
++ [#9499](https://github.com/rust-lang/rust-clippy/pull/9499)
++* [`from_over_into`]: The suggestion is now a machine applicable and contains explanations
++ [#9649](https://github.com/rust-lang/rust-clippy/pull/9649)
++* [`needless_return`]: The automatic suggestion now removes all required semicolons
++ [#9497](https://github.com/rust-lang/rust-clippy/pull/9497)
++* [`to_string_in_format_args`]: The suggestion now keeps parenthesis around values
++ [#9590](https://github.com/rust-lang/rust-clippy/pull/9590)
++* [`manual_assert`]: The suggestion now preserves comments
++ [#9479](https://github.com/rust-lang/rust-clippy/pull/9479)
++* [`redundant_allocation`]: The suggestion applicability is now marked `MaybeIncorrect` to
++ avoid semantic changes
++ [#9634](https://github.com/rust-lang/rust-clippy/pull/9634)
++* [`assertions_on_result_states`]: The suggestion has been corrected, for cases where the
++ `assert!` is not in a statement.
++ [#9453](https://github.com/rust-lang/rust-clippy/pull/9453)
++* [`nonminimal_bool`]: The suggestion no longer expands macros
++ [#9457](https://github.com/rust-lang/rust-clippy/pull/9457)
++* [`collapsible_match`]: Now specifies field names, when a struct is destructed
++ [#9685](https://github.com/rust-lang/rust-clippy/pull/9685)
++* [`unnecessary_cast`]: The suggestion now adds parenthesis for negative numbers
++ [#9577](https://github.com/rust-lang/rust-clippy/pull/9577)
++* [`redundant_closure`]: The suggestion now works for `impl FnMut` arguments
++ [#9556](https://github.com/rust-lang/rust-clippy/pull/9556)
++
++### ICE Fixes
++
++* [`unnecessary_to_owned`]: Avoid ICEs in favor of false negatives if information is missing
++ [#9505](https://github.com/rust-lang/rust-clippy/pull/9505)
++* [`manual_range_contains`]: No longer ICEs on values behind references
++ [#9627](https://github.com/rust-lang/rust-clippy/pull/9627)
++* [`needless_pass_by_value`]: No longer ICEs on unsized `dyn Fn` arguments
++ [#9531](https://github.com/rust-lang/rust-clippy/pull/9531)
++* `*_interior_mutable_const` lints: no longer ICE on const unions containing `!Freeze` types
++ [#9539](https://github.com/rust-lang/rust-clippy/pull/9539)
++
++### Others
++
++* Released `rustc_tools_util` for version information on `Crates.io`. (Further adjustments will
++ not be published as part of this changelog)
+
+## Rust 1.65
+
++Released 2022-11-03
+
+[3c7e7dbc...b52fb523](https://github.com/rust-lang/rust-clippy/compare/3c7e7dbc...b52fb523)
+
+### Important Changes
+
+* Clippy now has an `--explain <LINT>` command to show the lint description in the console
+ [#8952](https://github.com/rust-lang/rust-clippy/pull/8952)
+
+### New Lints
+
+* [`unused_peekable`]
+ [#9258](https://github.com/rust-lang/rust-clippy/pull/9258)
+* [`collapsible_str_replace`]
+ [#9269](https://github.com/rust-lang/rust-clippy/pull/9269)
+* [`manual_string_new`]
+ [#9295](https://github.com/rust-lang/rust-clippy/pull/9295)
+* [`iter_on_empty_collections`]
+ [#9187](https://github.com/rust-lang/rust-clippy/pull/9187)
+* [`iter_on_single_items`]
+ [#9187](https://github.com/rust-lang/rust-clippy/pull/9187)
+* [`bool_to_int_with_if`]
+ [#9412](https://github.com/rust-lang/rust-clippy/pull/9412)
+* [`multi_assignments`]
+ [#9379](https://github.com/rust-lang/rust-clippy/pull/9379)
+* [`result_large_err`]
+ [#9373](https://github.com/rust-lang/rust-clippy/pull/9373)
+* [`partialeq_to_none`]
+ [#9288](https://github.com/rust-lang/rust-clippy/pull/9288)
+* [`suspicious_to_owned`]
+ [#8984](https://github.com/rust-lang/rust-clippy/pull/8984)
+* [`cast_slice_from_raw_parts`]
+ [#9247](https://github.com/rust-lang/rust-clippy/pull/9247)
+* [`manual_instant_elapsed`]
+ [#9264](https://github.com/rust-lang/rust-clippy/pull/9264)
+
+### Moves and Deprecations
+
+* Moved [`significant_drop_in_scrutinee`] to `nursery` (now allow-by-default)
+ [#9302](https://github.com/rust-lang/rust-clippy/pull/9302)
+* Rename `logic_bug` to [`overly_complex_bool_expr`]
+ [#9306](https://github.com/rust-lang/rust-clippy/pull/9306)
+* Rename `arithmetic` to [`arithmetic_side_effects`]
+ [#9443](https://github.com/rust-lang/rust-clippy/pull/9443)
+* Moved [`only_used_in_recursion`] to complexity (now warn-by-default)
+ [#8804](https://github.com/rust-lang/rust-clippy/pull/8804)
+* Moved [`assertions_on_result_states`] to restriction (now allow-by-default)
+ [#9273](https://github.com/rust-lang/rust-clippy/pull/9273)
+* Renamed `blacklisted_name` to [`disallowed_names`]
+ [#8974](https://github.com/rust-lang/rust-clippy/pull/8974)
+
+### Enhancements
+
+* [`option_if_let_else`]: Now also checks for match expressions
+ [#8696](https://github.com/rust-lang/rust-clippy/pull/8696)
+* [`explicit_auto_deref`]: Now lints on implicit returns in closures
+ [#9126](https://github.com/rust-lang/rust-clippy/pull/9126)
+* [`needless_borrow`]: Now considers trait implementations
+ [#9136](https://github.com/rust-lang/rust-clippy/pull/9136)
+* [`suboptimal_flops`], [`imprecise_flops`]: Now lint on constant expressions
+ [#9404](https://github.com/rust-lang/rust-clippy/pull/9404)
+* [`if_let_mutex`]: Now detects mutex behind references and warns about deadlocks
+ [#9318](https://github.com/rust-lang/rust-clippy/pull/9318)
+
+### False Positive Fixes
+
+* [`unit_arg`] [`default_trait_access`] [`missing_docs_in_private_items`]: No longer
+ trigger in code generated from proc-macros
+ [#8694](https://github.com/rust-lang/rust-clippy/pull/8694)
+* [`unwrap_used`]: Now lints uses of `unwrap_err`
+ [#9338](https://github.com/rust-lang/rust-clippy/pull/9338)
+* [`expect_used`]: Now lints uses of `expect_err`
+ [#9338](https://github.com/rust-lang/rust-clippy/pull/9338)
+* [`transmute_undefined_repr`]: Now longer lints if the first field is compatible
+ with the other type
+ [#9287](https://github.com/rust-lang/rust-clippy/pull/9287)
+* [`unnecessary_to_owned`]: No longer lints, if type change cased errors in
+ the caller function
+ [#9424](https://github.com/rust-lang/rust-clippy/pull/9424)
+* [`match_like_matches_macro`]: No longer lints, if there are comments inside the
+ match expression
+ [#9276](https://github.com/rust-lang/rust-clippy/pull/9276)
+* [`partialeq_to_none`]: No longer trigger in code generated from macros
+ [#9389](https://github.com/rust-lang/rust-clippy/pull/9389)
+* [`arithmetic_side_effects`]: No longer lints expressions that only use literals
+ [#9365](https://github.com/rust-lang/rust-clippy/pull/9365)
+* [`explicit_auto_deref`]: Now ignores references on block expressions when the type
+ is `Sized`, on `dyn Trait` returns and when the suggestion is non-trivial
+ [#9126](https://github.com/rust-lang/rust-clippy/pull/9126)
+* [`trait_duplication_in_bounds`]: Now better tracks bounds to avoid false positives
+ [#9167](https://github.com/rust-lang/rust-clippy/pull/9167)
+* [`format_in_format_args`]: Now suggests cases where the result is formatted again
+ [#9349](https://github.com/rust-lang/rust-clippy/pull/9349)
+* [`only_used_in_recursion`]: No longer lints on function without recursions and
+ takes external functions into account
+ [#8804](https://github.com/rust-lang/rust-clippy/pull/8804)
+* [`missing_const_for_fn`]: No longer lints in proc-macros
+ [#9308](https://github.com/rust-lang/rust-clippy/pull/9308)
+* [`non_ascii_literal`]: Allow non-ascii comments in tests and make sure `#[allow]`
+ attributes work in tests
+ [#9327](https://github.com/rust-lang/rust-clippy/pull/9327)
+* [`question_mark`]: No longer lint `if let`s with subpatterns
+ [#9348](https://github.com/rust-lang/rust-clippy/pull/9348)
+* [`needless_collect`]: No longer lints in loops
+ [#8992](https://github.com/rust-lang/rust-clippy/pull/8992)
+* [`mut_mutex_lock`]: No longer lints if the mutex is behind an immutable reference
+ [#9418](https://github.com/rust-lang/rust-clippy/pull/9418)
+* [`needless_return`]: Now ignores returns with arguments
+ [#9381](https://github.com/rust-lang/rust-clippy/pull/9381)
+* [`range_plus_one`], [`range_minus_one`]: Now ignores code with macros
+ [#9446](https://github.com/rust-lang/rust-clippy/pull/9446)
+* [`assertions_on_result_states`]: No longer lints on the unit type
+ [#9273](https://github.com/rust-lang/rust-clippy/pull/9273)
+
+### Suggestion Fixes/Improvements
+
+* [`unwrap_or_else_default`]: Now suggests `unwrap_or_default()` for empty strings
+ [#9421](https://github.com/rust-lang/rust-clippy/pull/9421)
+* [`if_then_some_else_none`]: Now also suggests `bool::then_some`
+ [#9289](https://github.com/rust-lang/rust-clippy/pull/9289)
+* [`redundant_closure_call`]: The suggestion now works for async closures
+ [#9053](https://github.com/rust-lang/rust-clippy/pull/9053)
+* [`suboptimal_flops`]: Now suggests parenthesis when they are required
+ [#9394](https://github.com/rust-lang/rust-clippy/pull/9394)
+* [`case_sensitive_file_extension_comparisons`]: Now suggests `map_or(..)` instead of `map(..).unwrap_or`
+ [#9341](https://github.com/rust-lang/rust-clippy/pull/9341)
+* Deprecated configuration values can now be updated automatically
+ [#9252](https://github.com/rust-lang/rust-clippy/pull/9252)
+* [`or_fun_call`]: Now suggest `Entry::or_default` for `Entry::or_insert(Default::default())`
+ [#9342](https://github.com/rust-lang/rust-clippy/pull/9342)
+* [`unwrap_used`]: Only suggests `expect` if [`expect_used`] is allowed
+ [#9223](https://github.com/rust-lang/rust-clippy/pull/9223)
+
+### ICE Fixes
+
+* Fix ICE in [`useless_format`] for literals
+ [#9406](https://github.com/rust-lang/rust-clippy/pull/9406)
+* Fix infinite loop in [`vec_init_then_push`]
+ [#9441](https://github.com/rust-lang/rust-clippy/pull/9441)
+* Fix ICE when reading literals with weird proc-macro spans
+ [#9303](https://github.com/rust-lang/rust-clippy/pull/9303)
+
+## Rust 1.64
+
+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_complete_range`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_complete_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
+[`box_collection`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_collection
+[`box_default`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_default
+[`box_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_vec
+[`boxed_local`]: https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
+[`branches_sharing_code`]: https://rust-lang.github.io/rust-clippy/master/index.html#branches_sharing_code
+[`builtin_type_shadow`]: https://rust-lang.github.io/rust-clippy/master/index.html#builtin_type_shadow
+[`bytes_count_to_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_count_to_len
+[`bytes_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_nth
+[`cargo_common_metadata`]: https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata
+[`case_sensitive_file_extension_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#case_sensitive_file_extension_comparisons
+[`cast_abs_to_unsigned`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_abs_to_unsigned
+[`cast_enum_constructor`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_constructor
+[`cast_enum_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_truncation
+[`cast_lossless`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
+[`cast_nan_to_int`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_nan_to_int
+[`cast_possible_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
+[`cast_possible_wrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_wrap
+[`cast_precision_loss`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_precision_loss
+[`cast_ptr_alignment`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_ptr_alignment
+[`cast_ref_to_mut`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_ref_to_mut
+[`cast_sign_loss`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_sign_loss
+[`cast_slice_different_sizes`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_different_sizes
+[`cast_slice_from_raw_parts`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_from_raw_parts
+[`char_lit_as_u8`]: https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
+[`chars_last_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_last_cmp
+[`chars_next_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_next_cmp
+[`checked_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#checked_conversions
+[`clone_double_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
+[`clone_on_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
+[`clone_on_ref_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_ref_ptr
+[`cloned_instead_of_copied`]: https://rust-lang.github.io/rust-clippy/master/index.html#cloned_instead_of_copied
+[`cmp_nan`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_nan
+[`cmp_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_null
+[`cmp_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
+[`cognitive_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cognitive_complexity
+[`collapsible_else_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_else_if
+[`collapsible_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
+[`collapsible_match`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
+[`collapsible_str_replace`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_str_replace
+[`comparison_chain`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_chain
+[`comparison_to_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_to_empty
+[`const_static_lifetime`]: https://rust-lang.github.io/rust-clippy/master/index.html#const_static_lifetime
+[`copy_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#copy_iterator
+[`crate_in_macro_def`]: https://rust-lang.github.io/rust-clippy/master/index.html#crate_in_macro_def
+[`create_dir`]: https://rust-lang.github.io/rust-clippy/master/index.html#create_dir
+[`crosspointer_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#crosspointer_transmute
+[`cyclomatic_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
+[`dbg_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#dbg_macro
+[`debug_assert_with_mut_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#debug_assert_with_mut_call
+[`decimal_literal_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#decimal_literal_representation
+[`declare_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#declare_interior_mutable_const
+[`default_instead_of_iter_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_instead_of_iter_empty
+[`default_numeric_fallback`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_numeric_fallback
+[`default_trait_access`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_trait_access
+[`default_union_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_union_representation
+[`deprecated_cfg_attr`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_cfg_attr
+[`deprecated_semver`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_semver
+[`deref_addrof`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
+[`deref_by_slicing`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_by_slicing
+[`derivable_impls`]: https://rust-lang.github.io/rust-clippy/master/index.html#derivable_impls
+[`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
+[`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord
+[`derive_partial_eq_without_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq
+[`disallowed_macros`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_macros
+[`disallowed_method`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_method
+[`disallowed_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_methods
+[`disallowed_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_names
+[`disallowed_script_idents`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_script_idents
+[`disallowed_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_type
+[`disallowed_types`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_types
+[`diverging_sub_expression`]: https://rust-lang.github.io/rust-clippy/master/index.html#diverging_sub_expression
+[`doc_link_with_quotes`]: https://rust-lang.github.io/rust-clippy/master/index.html#doc_link_with_quotes
+[`doc_markdown`]: https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown
+[`double_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_comparisons
+[`double_must_use`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_must_use
+[`double_neg`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_neg
+[`double_parens`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
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+[`suboptimal_flops`]: https://rust-lang.github.io/rust-clippy/master/index.html#suboptimal_flops
+[`suspicious_arithmetic_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_arithmetic_impl
+[`suspicious_assignment_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_assignment_formatting
+[`suspicious_else_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_else_formatting
+[`suspicious_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_map
+[`suspicious_op_assign_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_op_assign_impl
+[`suspicious_operation_groupings`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_operation_groupings
+[`suspicious_splitn`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_splitn
+[`suspicious_to_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_to_owned
+[`suspicious_unary_op_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_unary_op_formatting
+[`suspicious_xor_used_as_pow`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_xor_used_as_pow
+[`swap_ptr_to_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#swap_ptr_to_ref
+[`tabs_in_doc_comments`]: https://rust-lang.github.io/rust-clippy/master/index.html#tabs_in_doc_comments
+[`temporary_assignment`]: https://rust-lang.github.io/rust-clippy/master/index.html#temporary_assignment
+[`temporary_cstring_as_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#temporary_cstring_as_ptr
+[`to_digit_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_digit_is_some
+[`to_string_in_display`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_display
+[`to_string_in_format_args`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_format_args
+[`todo`]: https://rust-lang.github.io/rust-clippy/master/index.html#todo
+[`too_many_arguments`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
+[`too_many_lines`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_lines
+[`toplevel_ref_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
+[`trailing_empty_array`]: https://rust-lang.github.io/rust-clippy/master/index.html#trailing_empty_array
+[`trait_duplication_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds
+[`transmute_bytes_to_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_bytes_to_str
+[`transmute_float_to_int`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_float_to_int
+[`transmute_int_to_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_bool
+[`transmute_int_to_char`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_char
+[`transmute_int_to_float`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_float
+[`transmute_num_to_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_num_to_bytes
+[`transmute_ptr_to_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ptr
+[`transmute_ptr_to_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
+[`transmute_undefined_repr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_undefined_repr
+[`transmutes_expressible_as_ptr_casts`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmutes_expressible_as_ptr_casts
+[`transmuting_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmuting_null
+[`trim_split_whitespace`]: https://rust-lang.github.io/rust-clippy/master/index.html#trim_split_whitespace
+[`trivial_regex`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
+[`trivially_copy_pass_by_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
+[`try_err`]: https://rust-lang.github.io/rust-clippy/master/index.html#try_err
+[`type_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
+[`type_repetition_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_repetition_in_bounds
+[`unchecked_duration_subtraction`]: https://rust-lang.github.io/rust-clippy/master/index.html#unchecked_duration_subtraction
+[`undocumented_unsafe_blocks`]: https://rust-lang.github.io/rust-clippy/master/index.html#undocumented_unsafe_blocks
+[`undropped_manually_drops`]: https://rust-lang.github.io/rust-clippy/master/index.html#undropped_manually_drops
+[`unicode_not_nfc`]: https://rust-lang.github.io/rust-clippy/master/index.html#unicode_not_nfc
+[`unimplemented`]: https://rust-lang.github.io/rust-clippy/master/index.html#unimplemented
+[`uninit_assumed_init`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
+[`uninit_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_vec
+[`uninlined_format_args`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninlined_format_args
+[`unit_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
+[`unit_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_cmp
+[`unit_hash`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_hash
+[`unit_return_expecting_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_return_expecting_ord
+[`unknown_clippy_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#unknown_clippy_lints
+[`unnecessary_cast`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
+[`unnecessary_filter_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
+[`unnecessary_find_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_find_map
+[`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
+[`unnecessary_join`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_join
+[`unnecessary_lazy_evaluations`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_lazy_evaluations
+[`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
+[`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation
+[`unnecessary_owned_empty_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_owned_empty_strings
+[`unnecessary_safety_comment`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_safety_comment
+[`unnecessary_safety_doc`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_safety_doc
+[`unnecessary_self_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_self_imports
+[`unnecessary_sort_by`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by
+[`unnecessary_to_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_to_owned
+[`unnecessary_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap
+[`unnecessary_wraps`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_wraps
+[`unneeded_field_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
+[`unneeded_wildcard_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_wildcard_pattern
+[`unnested_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnested_or_patterns
+[`unreachable`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreachable
+[`unreadable_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
+[`unsafe_derive_deserialize`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_derive_deserialize
+[`unsafe_removed_from_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_removed_from_name
+[`unsafe_vector_initialization`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_vector_initialization
+[`unseparated_literal_suffix`]: https://rust-lang.github.io/rust-clippy/master/index.html#unseparated_literal_suffix
+[`unsound_collection_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsound_collection_transmute
+[`unstable_as_mut_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#unstable_as_mut_slice
+[`unstable_as_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#unstable_as_slice
+[`unused_async`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_async
+[`unused_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_collect
+[`unused_format_specs`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_format_specs
+[`unused_io_amount`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
+[`unused_label`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_label
+[`unused_peekable`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_peekable
+[`unused_rounding`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_rounding
+[`unused_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_self
+[`unused_unit`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
+[`unusual_byte_groupings`]: https://rust-lang.github.io/rust-clippy/master/index.html#unusual_byte_groupings
+[`unwrap_in_result`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_in_result
+[`unwrap_or_else_default`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_or_else_default
+[`unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_used
+[`upper_case_acronyms`]: https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
+[`use_debug`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_debug
+[`use_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_self
+[`used_underscore_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding
+[`useless_asref`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
+[`useless_attribute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute
+[`useless_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
+[`useless_format`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
+[`useless_let_if_seq`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
+[`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute
+[`useless_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec
+[`vec_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_box
+[`vec_init_then_push`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_init_then_push
+[`vec_resize_to_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_resize_to_zero
+[`verbose_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_bit_mask
+[`verbose_file_reads`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_file_reads
+[`vtable_address_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#vtable_address_comparisons
+[`while_immutable_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_immutable_condition
+[`while_let_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
+[`while_let_on_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_on_iterator
+[`wildcard_dependencies`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_dependencies
+[`wildcard_enum_match_arm`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_enum_match_arm
+[`wildcard_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_imports
+[`wildcard_in_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_in_or_patterns
+[`write_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#write_literal
+[`write_with_newline`]: https://rust-lang.github.io/rust-clippy/master/index.html#write_with_newline
+[`writeln_empty_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#writeln_empty_string
+[`wrong_pub_self_convention`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_pub_self_convention
+[`wrong_self_convention`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
+[`wrong_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_transmute
+[`zero_divided_by_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_divided_by_zero
+[`zero_prefixed_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_prefixed_literal
+[`zero_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_ptr
+[`zero_sized_map_values`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_sized_map_values
+[`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
- version = "0.1.67"
+[package]
+name = "clippy"
- rustc_tools_util = "0.2.1"
++version = "0.1.68"
+description = "A bunch of helpful lints to avoid common pitfalls in Rust"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["clippy", "lint", "plugin"]
+categories = ["development-tools", "development-tools::cargo-plugins"]
+build = "build.rs"
+edition = "2021"
+publish = false
+
+[[bin]]
+name = "cargo-clippy"
+test = false
+path = "src/main.rs"
+
+[[bin]]
+name = "clippy-driver"
+path = "src/driver.rs"
+
+[dependencies]
+clippy_lints = { path = "clippy_lints" }
+semver = "1.0"
- rustc_tools_util = "0.2.1"
++rustc_tools_util = "0.3.0"
+tempfile = { version = "3.2", optional = true }
+termize = "0.1"
+
+[dev-dependencies]
+compiletest_rs = { version = "0.9", features = ["tmp"] }
+tester = "0.9"
+regex = "1.5"
+toml = "0.5"
+walkdir = "2.3"
+# This is used by the `collect-metadata` alias.
+filetime = "0.2"
+
+# A noop dependency that changes in the Rust repository, it's a bit of a hack.
+# See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`
+# for more information.
+rustc-workspace-hack = "1.0"
+
+# UI test dependencies
+clippy_utils = { path = "clippy_utils" }
+derive-new = "0.5"
+if_chain = "1.0"
+itertools = "0.10.1"
+quote = "1.0"
+serde = { version = "1.0.125", features = ["derive"] }
+syn = { version = "1.0", features = ["full"] }
+futures = "0.3"
+parking_lot = "0.12"
+tokio = { version = "1", features = ["io-util"] }
+rustc-semver = "1.1"
+
+[build-dependencies]
++rustc_tools_util = "0.3.0"
+
+[features]
+deny-warnings = ["clippy_lints/deny-warnings"]
+integration = ["tempfile"]
+internal = ["clippy_lints/internal", "tempfile"]
+
+[package.metadata.rust-analyzer]
+# This package uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
- [](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test%22+event%3Apush+branch%3Aauto)
+# Clippy
+
++[/badge.svg?branch=auto&event=push)](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test+(bors)%22+event%3Apush+branch%3Aauto)
+[](https://github.com/rust-lang/rust-clippy#license)
+
+A collection of lints to catch common mistakes and improve your
+[Rust](https://github.com/rust-lang/rust) code.
+
+[There are over 550 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
+
+Lints are divided into categories, each with a default [lint
+level](https://doc.rust-lang.org/rustc/lints/levels.html). You can choose how
+much Clippy is supposed to ~~annoy~~ help you by changing the lint level by
+category.
+
+| Category | Description | Default level |
+| --------------------- | ----------------------------------------------------------------------------------- | ------------- |
+| `clippy::all` | all lints that are on by default (correctness, suspicious, style, complexity, perf) | **warn/deny** |
+| `clippy::correctness` | code that is outright wrong or useless | **deny** |
+| `clippy::suspicious` | code that is most likely wrong or useless | **warn** |
+| `clippy::complexity` | code that does something simple but in a complex way | **warn** |
+| `clippy::perf` | code that can be written to run faster | **warn** |
+| `clippy::style` | code that should be written in a more idiomatic way | **warn** |
+| `clippy::pedantic` | lints which are rather strict or might have false positives | allow |
+| `clippy::nursery` | new lints that are still under development | allow |
+| `clippy::cargo` | lints for the cargo manifest | allow | | allow |
+
+More to come, please [file an
+issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
+
+The [lint list](https://rust-lang.github.io/rust-clippy/master/index.html) also
+contains "restriction lints", which are for things which are usually not
+considered "bad", but may be useful to turn on in specific cases. These should
+be used very selectively, if at all.
--- /dev/null
- // forward git repo hashes we build at
- println!(
- "cargo:rustc-env=GIT_HASH={}",
- rustc_tools_util::get_commit_hash().unwrap_or_default()
- );
- println!(
- "cargo:rustc-env=COMMIT_DATE={}",
- rustc_tools_util::get_commit_date().unwrap_or_default()
- );
- println!(
- "cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}",
- rustc_tools_util::get_channel()
- );
+fn main() {
+ // Forward the profile to the main compilation
+ println!("cargo:rustc-env=PROFILE={}", std::env::var("PROFILE").unwrap());
+ // Don't rebuild even if nothing changed
+ println!("cargo:rerun-if-changed=build.rs");
++ rustc_tools_util::setup_version_info!();
+}
--- /dev/null
- version = "0.1.67"
+[package]
+name = "clippy_lints"
++version = "0.1.68"
+description = "A bunch of helpful lints to avoid common pitfalls in Rust"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["clippy", "lint", "plugin"]
+edition = "2021"
+
+[dependencies]
+cargo_metadata = "0.14"
+clippy_utils = { path = "../clippy_utils" }
+declare_clippy_lint = { path = "../declare_clippy_lint" }
+if_chain = "1.0"
+itertools = "0.10.1"
+pulldown-cmark = { version = "0.9", default-features = false }
+quine-mc_cluskey = "0.2"
+regex-syntax = "0.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", optional = true }
+tempfile = { version = "3.2", optional = true }
+toml = "0.5"
+unicode-normalization = "0.1"
+unicode-script = { version = "0.5", default-features = false }
+semver = "1.0"
+rustc-semver = "1.1"
+# NOTE: cargo requires serde feat in its url dep
+# see <https://github.com/rust-lang/rust/pull/63587#issuecomment-522343864>
+url = { version = "2.2", features = ["serde"] }
+
+[features]
+deny-warnings = ["clippy_utils/deny-warnings"]
+# build clippy with internal lints enabled, off by default
+internal = ["clippy_utils/internal", "serde_json", "tempfile"]
+
+[package.metadata.rust-analyzer]
+# This crate uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_then;
++use clippy_utils::msrvs::{self, Msrv};
++use clippy_utils::source::{trim_span, walk_span_to_context};
++use rustc_ast::ast::{Expr, ExprKind, LitKind, Pat, PatKind, RangeEnd, RangeLimits};
++use rustc_errors::Applicability;
++use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
++use rustc_middle::lint::in_external_macro;
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::Span;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for ranges which almost include the entire range of letters from 'a' to 'z'
++ /// or digits from '0' to '9', but don't because they're a half open range.
++ ///
++ /// ### Why is this bad?
++ /// This (`'a'..'z'`) is almost certainly a typo meant to include all letters.
++ ///
++ /// ### Example
++ /// ```rust
++ /// let _ = 'a'..'z';
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// let _ = 'a'..='z';
++ /// ```
++ #[clippy::version = "1.63.0"]
++ pub ALMOST_COMPLETE_RANGE,
++ suspicious,
++ "almost complete range"
++}
++impl_lint_pass!(AlmostCompleteRange => [ALMOST_COMPLETE_RANGE]);
++
++pub struct AlmostCompleteRange {
++ msrv: Msrv,
++}
++impl AlmostCompleteRange {
++ pub fn new(msrv: Msrv) -> Self {
++ Self { msrv }
++ }
++}
++impl EarlyLintPass for AlmostCompleteRange {
++ fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) {
++ if let ExprKind::Range(Some(start), Some(end), RangeLimits::HalfOpen) = &e.kind {
++ let ctxt = e.span.ctxt();
++ let sugg = if let Some(start) = walk_span_to_context(start.span, ctxt)
++ && let Some(end) = walk_span_to_context(end.span, ctxt)
++ && self.msrv.meets(msrvs::RANGE_INCLUSIVE)
++ {
++ Some((trim_span(cx.sess().source_map(), start.between(end)), "..="))
++ } else {
++ None
++ };
++ check_range(cx, e.span, start, end, sugg);
++ }
++ }
++
++ fn check_pat(&mut self, cx: &EarlyContext<'_>, p: &Pat) {
++ if let PatKind::Range(Some(start), Some(end), kind) = &p.kind
++ && matches!(kind.node, RangeEnd::Excluded)
++ {
++ let sugg = if self.msrv.meets(msrvs::RANGE_INCLUSIVE) {
++ "..="
++ } else {
++ "..."
++ };
++ check_range(cx, p.span, start, end, Some((kind.span, sugg)));
++ }
++ }
++
++ extract_msrv_attr!(EarlyContext);
++}
++
++fn check_range(cx: &EarlyContext<'_>, span: Span, start: &Expr, end: &Expr, sugg: Option<(Span, &str)>) {
++ if let ExprKind::Lit(start_token_lit) = start.peel_parens().kind
++ && let ExprKind::Lit(end_token_lit) = end.peel_parens().kind
++ && matches!(
++ (
++ LitKind::from_token_lit(start_token_lit),
++ LitKind::from_token_lit(end_token_lit),
++ ),
++ (
++ Ok(LitKind::Byte(b'a') | LitKind::Char('a')),
++ Ok(LitKind::Byte(b'z') | LitKind::Char('z'))
++ )
++ | (
++ Ok(LitKind::Byte(b'A') | LitKind::Char('A')),
++ Ok(LitKind::Byte(b'Z') | LitKind::Char('Z')),
++ )
++ | (
++ Ok(LitKind::Byte(b'0') | LitKind::Char('0')),
++ Ok(LitKind::Byte(b'9') | LitKind::Char('9')),
++ )
++ )
++ && !in_external_macro(cx.sess(), span)
++ {
++ span_lint_and_then(
++ cx,
++ ALMOST_COMPLETE_RANGE,
++ span,
++ "almost complete ascii range",
++ |diag| {
++ if let Some((span, sugg)) = sugg {
++ diag.span_suggestion(
++ span,
++ "use an inclusive range",
++ sugg,
++ Applicability::MaybeIncorrect,
++ );
++ }
++ }
++ );
++ }
++}
--- /dev/null
- #[clippy::version = "1.65.0"]
+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).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Box<String> = Box::new(Default::default());
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x: Box<String> = Box::default();
+ /// ```
++ #[clippy::version = "1.66.0"]
+ 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_path, ..) = arg.kind
+ && !in_external_macro(cx.sess(), expr.span)
+ && (expr.span.eq_ctxt(arg.span) || is_vec_expn(cx, arg))
+ && seg.ident.name == sym::new
+ && path_def_id(cx, ty).map_or(false, |id| Some(id) == cx.tcx.lang_items().owned_box())
+ && is_default_equivalent(cx, arg)
+ {
+ let arg_ty = cx.typeck_results().expr_ty(arg);
+ span_lint_and_sugg(
+ cx,
+ BOX_DEFAULT,
+ expr.span,
+ "`Box::new(_)` of default value",
+ "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
- #[clippy::version = "1.64.0"]
+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;
+use clippy_utils::msrvs::{self, Msrv};
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+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 = "1.65.0"]
+ 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 = "1.66.0"]
+ pub CAST_NAN_TO_INT,
+ suspicious,
+ "casting a known floating-point NaN into an integer"
+}
+
+pub struct Casts {
+ msrv: Msrv,
+}
+
+impl Casts {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> 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 self.msrv.meets(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
- crate::almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE_INFO,
+// 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.
+
+pub(crate) static LINTS: &[&crate::LintInfo] = &[
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::clippy_lints_internal::CLIPPY_LINTS_INTERNAL_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::collapsible_calls::COLLAPSIBLE_SPAN_LINT_CALLS_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::compiler_lint_functions::COMPILER_LINT_FUNCTIONS_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::if_chain_style::IF_CHAIN_STYLE_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::interning_defined_symbol::INTERNING_DEFINED_SYMBOL_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::interning_defined_symbol::UNNECESSARY_SYMBOL_STR_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::invalid_paths::INVALID_PATHS_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::lint_without_lint_pass::DEFAULT_DEPRECATION_REASON_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::lint_without_lint_pass::DEFAULT_LINT_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::lint_without_lint_pass::INVALID_CLIPPY_VERSION_ATTRIBUTE_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::lint_without_lint_pass::LINT_WITHOUT_LINT_PASS_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::lint_without_lint_pass::MISSING_CLIPPY_VERSION_ATTRIBUTE_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::msrv_attr_impl::MISSING_MSRV_ATTR_IMPL_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::outer_expn_data_pass::OUTER_EXPN_EXPN_DATA_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::produce_ice::PRODUCE_ICE_INFO,
+ #[cfg(feature = "internal")]
+ crate::utils::internal_lints::unnecessary_def_path::UNNECESSARY_DEF_PATH_INFO,
++ crate::almost_complete_range::ALMOST_COMPLETE_RANGE_INFO,
+ crate::approx_const::APPROX_CONSTANT_INFO,
+ crate::as_conversions::AS_CONVERSIONS_INFO,
+ crate::asm_syntax::INLINE_ASM_X86_ATT_SYNTAX_INFO,
+ crate::asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX_INFO,
+ crate::assertions_on_constants::ASSERTIONS_ON_CONSTANTS_INFO,
+ crate::assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES_INFO,
+ crate::async_yields_async::ASYNC_YIELDS_ASYNC_INFO,
+ crate::attrs::ALLOW_ATTRIBUTES_WITHOUT_REASON_INFO,
+ crate::attrs::BLANKET_CLIPPY_RESTRICTION_LINTS_INFO,
+ crate::attrs::DEPRECATED_CFG_ATTR_INFO,
+ crate::attrs::DEPRECATED_SEMVER_INFO,
+ crate::attrs::EMPTY_LINE_AFTER_OUTER_ATTR_INFO,
+ crate::attrs::INLINE_ALWAYS_INFO,
+ crate::attrs::MISMATCHED_TARGET_OS_INFO,
+ crate::attrs::USELESS_ATTRIBUTE_INFO,
+ crate::await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE_INFO,
+ crate::await_holding_invalid::AWAIT_HOLDING_LOCK_INFO,
+ crate::await_holding_invalid::AWAIT_HOLDING_REFCELL_REF_INFO,
+ crate::blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS_INFO,
+ crate::bool_assert_comparison::BOOL_ASSERT_COMPARISON_INFO,
+ crate::bool_to_int_with_if::BOOL_TO_INT_WITH_IF_INFO,
+ crate::booleans::NONMINIMAL_BOOL_INFO,
+ crate::booleans::OVERLY_COMPLEX_BOOL_EXPR_INFO,
+ crate::borrow_deref_ref::BORROW_DEREF_REF_INFO,
+ crate::box_default::BOX_DEFAULT_INFO,
+ crate::cargo::CARGO_COMMON_METADATA_INFO,
+ crate::cargo::MULTIPLE_CRATE_VERSIONS_INFO,
+ crate::cargo::NEGATIVE_FEATURE_NAMES_INFO,
+ crate::cargo::REDUNDANT_FEATURE_NAMES_INFO,
+ crate::cargo::WILDCARD_DEPENDENCIES_INFO,
+ crate::casts::AS_PTR_CAST_MUT_INFO,
+ crate::casts::AS_UNDERSCORE_INFO,
+ crate::casts::BORROW_AS_PTR_INFO,
+ crate::casts::CAST_ABS_TO_UNSIGNED_INFO,
+ crate::casts::CAST_ENUM_CONSTRUCTOR_INFO,
+ crate::casts::CAST_ENUM_TRUNCATION_INFO,
+ crate::casts::CAST_LOSSLESS_INFO,
+ crate::casts::CAST_NAN_TO_INT_INFO,
+ crate::casts::CAST_POSSIBLE_TRUNCATION_INFO,
+ crate::casts::CAST_POSSIBLE_WRAP_INFO,
+ crate::casts::CAST_PRECISION_LOSS_INFO,
+ crate::casts::CAST_PTR_ALIGNMENT_INFO,
+ crate::casts::CAST_REF_TO_MUT_INFO,
+ crate::casts::CAST_SIGN_LOSS_INFO,
+ crate::casts::CAST_SLICE_DIFFERENT_SIZES_INFO,
+ crate::casts::CAST_SLICE_FROM_RAW_PARTS_INFO,
+ crate::casts::CHAR_LIT_AS_U8_INFO,
+ crate::casts::FN_TO_NUMERIC_CAST_INFO,
+ crate::casts::FN_TO_NUMERIC_CAST_ANY_INFO,
+ crate::casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION_INFO,
+ crate::casts::PTR_AS_PTR_INFO,
+ crate::casts::UNNECESSARY_CAST_INFO,
+ crate::checked_conversions::CHECKED_CONVERSIONS_INFO,
+ crate::cognitive_complexity::COGNITIVE_COMPLEXITY_INFO,
+ crate::collapsible_if::COLLAPSIBLE_ELSE_IF_INFO,
+ crate::collapsible_if::COLLAPSIBLE_IF_INFO,
+ crate::comparison_chain::COMPARISON_CHAIN_INFO,
+ crate::copies::BRANCHES_SHARING_CODE_INFO,
+ crate::copies::IFS_SAME_COND_INFO,
+ crate::copies::IF_SAME_THEN_ELSE_INFO,
+ crate::copies::SAME_FUNCTIONS_IN_IF_CONDITION_INFO,
+ crate::copy_iterator::COPY_ITERATOR_INFO,
+ crate::crate_in_macro_def::CRATE_IN_MACRO_DEF_INFO,
+ crate::create_dir::CREATE_DIR_INFO,
+ crate::dbg_macro::DBG_MACRO_INFO,
+ crate::default::DEFAULT_TRAIT_ACCESS_INFO,
+ crate::default::FIELD_REASSIGN_WITH_DEFAULT_INFO,
+ crate::default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY_INFO,
+ crate::default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK_INFO,
+ crate::default_union_representation::DEFAULT_UNION_REPRESENTATION_INFO,
+ crate::dereference::EXPLICIT_AUTO_DEREF_INFO,
+ crate::dereference::EXPLICIT_DEREF_METHODS_INFO,
+ crate::dereference::NEEDLESS_BORROW_INFO,
+ crate::dereference::REF_BINDING_TO_REFERENCE_INFO,
+ crate::derivable_impls::DERIVABLE_IMPLS_INFO,
+ crate::derive::DERIVE_HASH_XOR_EQ_INFO,
+ crate::derive::DERIVE_ORD_XOR_PARTIAL_ORD_INFO,
+ crate::derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ_INFO,
+ crate::derive::EXPL_IMPL_CLONE_ON_COPY_INFO,
+ crate::derive::UNSAFE_DERIVE_DESERIALIZE_INFO,
+ crate::disallowed_macros::DISALLOWED_MACROS_INFO,
+ crate::disallowed_methods::DISALLOWED_METHODS_INFO,
+ crate::disallowed_names::DISALLOWED_NAMES_INFO,
+ crate::disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS_INFO,
+ crate::disallowed_types::DISALLOWED_TYPES_INFO,
+ crate::doc::DOC_LINK_WITH_QUOTES_INFO,
+ crate::doc::DOC_MARKDOWN_INFO,
+ crate::doc::MISSING_ERRORS_DOC_INFO,
+ crate::doc::MISSING_PANICS_DOC_INFO,
+ crate::doc::MISSING_SAFETY_DOC_INFO,
+ crate::doc::NEEDLESS_DOCTEST_MAIN_INFO,
+ crate::doc::UNNECESSARY_SAFETY_DOC_INFO,
+ crate::double_parens::DOUBLE_PARENS_INFO,
+ crate::drop_forget_ref::DROP_COPY_INFO,
+ crate::drop_forget_ref::DROP_NON_DROP_INFO,
+ crate::drop_forget_ref::DROP_REF_INFO,
+ crate::drop_forget_ref::FORGET_COPY_INFO,
+ crate::drop_forget_ref::FORGET_NON_DROP_INFO,
+ crate::drop_forget_ref::FORGET_REF_INFO,
+ crate::drop_forget_ref::UNDROPPED_MANUALLY_DROPS_INFO,
+ crate::duplicate_mod::DUPLICATE_MOD_INFO,
+ crate::else_if_without_else::ELSE_IF_WITHOUT_ELSE_INFO,
+ crate::empty_drop::EMPTY_DROP_INFO,
+ crate::empty_enum::EMPTY_ENUM_INFO,
+ crate::empty_structs_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS_INFO,
+ crate::entry::MAP_ENTRY_INFO,
+ crate::enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT_INFO,
+ crate::enum_variants::ENUM_VARIANT_NAMES_INFO,
+ crate::enum_variants::MODULE_INCEPTION_INFO,
+ crate::enum_variants::MODULE_NAME_REPETITIONS_INFO,
+ crate::equatable_if_let::EQUATABLE_IF_LET_INFO,
+ crate::escape::BOXED_LOCAL_INFO,
+ crate::eta_reduction::REDUNDANT_CLOSURE_INFO,
+ crate::eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS_INFO,
+ crate::excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS_INFO,
+ crate::excessive_bools::STRUCT_EXCESSIVE_BOOLS_INFO,
+ crate::exhaustive_items::EXHAUSTIVE_ENUMS_INFO,
+ crate::exhaustive_items::EXHAUSTIVE_STRUCTS_INFO,
+ crate::exit::EXIT_INFO,
+ crate::explicit_write::EXPLICIT_WRITE_INFO,
+ crate::fallible_impl_from::FALLIBLE_IMPL_FROM_INFO,
+ crate::float_literal::EXCESSIVE_PRECISION_INFO,
+ crate::float_literal::LOSSY_FLOAT_LITERAL_INFO,
+ crate::floating_point_arithmetic::IMPRECISE_FLOPS_INFO,
+ crate::floating_point_arithmetic::SUBOPTIMAL_FLOPS_INFO,
+ crate::format::USELESS_FORMAT_INFO,
+ crate::format_args::FORMAT_IN_FORMAT_ARGS_INFO,
+ crate::format_args::TO_STRING_IN_FORMAT_ARGS_INFO,
+ crate::format_args::UNINLINED_FORMAT_ARGS_INFO,
+ crate::format_args::UNUSED_FORMAT_SPECS_INFO,
+ crate::format_impl::PRINT_IN_FORMAT_IMPL_INFO,
+ crate::format_impl::RECURSIVE_FORMAT_IMPL_INFO,
+ crate::format_push_string::FORMAT_PUSH_STRING_INFO,
+ crate::formatting::POSSIBLE_MISSING_COMMA_INFO,
+ crate::formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING_INFO,
+ crate::formatting::SUSPICIOUS_ELSE_FORMATTING_INFO,
+ crate::formatting::SUSPICIOUS_UNARY_OP_FORMATTING_INFO,
+ crate::from_over_into::FROM_OVER_INTO_INFO,
+ crate::from_raw_with_void_ptr::FROM_RAW_WITH_VOID_PTR_INFO,
+ crate::from_str_radix_10::FROM_STR_RADIX_10_INFO,
+ crate::functions::DOUBLE_MUST_USE_INFO,
+ crate::functions::MISNAMED_GETTERS_INFO,
+ crate::functions::MUST_USE_CANDIDATE_INFO,
+ crate::functions::MUST_USE_UNIT_INFO,
+ crate::functions::NOT_UNSAFE_PTR_ARG_DEREF_INFO,
+ crate::functions::RESULT_LARGE_ERR_INFO,
+ crate::functions::RESULT_UNIT_ERR_INFO,
+ crate::functions::TOO_MANY_ARGUMENTS_INFO,
+ crate::functions::TOO_MANY_LINES_INFO,
+ crate::future_not_send::FUTURE_NOT_SEND_INFO,
+ crate::if_let_mutex::IF_LET_MUTEX_INFO,
+ crate::if_not_else::IF_NOT_ELSE_INFO,
+ crate::if_then_some_else_none::IF_THEN_SOME_ELSE_NONE_INFO,
+ crate::implicit_hasher::IMPLICIT_HASHER_INFO,
+ crate::implicit_return::IMPLICIT_RETURN_INFO,
+ crate::implicit_saturating_add::IMPLICIT_SATURATING_ADD_INFO,
+ crate::implicit_saturating_sub::IMPLICIT_SATURATING_SUB_INFO,
+ crate::inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR_INFO,
+ crate::index_refutable_slice::INDEX_REFUTABLE_SLICE_INFO,
+ crate::indexing_slicing::INDEXING_SLICING_INFO,
+ crate::indexing_slicing::OUT_OF_BOUNDS_INDEXING_INFO,
+ crate::infinite_iter::INFINITE_ITER_INFO,
+ crate::infinite_iter::MAYBE_INFINITE_ITER_INFO,
+ crate::inherent_impl::MULTIPLE_INHERENT_IMPL_INFO,
+ crate::inherent_to_string::INHERENT_TO_STRING_INFO,
+ crate::inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY_INFO,
+ crate::init_numbered_fields::INIT_NUMBERED_FIELDS_INFO,
+ crate::inline_fn_without_body::INLINE_FN_WITHOUT_BODY_INFO,
+ crate::instant_subtraction::MANUAL_INSTANT_ELAPSED_INFO,
+ crate::instant_subtraction::UNCHECKED_DURATION_SUBTRACTION_INFO,
+ crate::int_plus_one::INT_PLUS_ONE_INFO,
+ crate::invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS_INFO,
+ crate::invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED_INFO,
+ crate::items_after_statements::ITEMS_AFTER_STATEMENTS_INFO,
+ crate::iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR_INFO,
+ crate::large_const_arrays::LARGE_CONST_ARRAYS_INFO,
+ crate::large_enum_variant::LARGE_ENUM_VARIANT_INFO,
+ crate::large_include_file::LARGE_INCLUDE_FILE_INFO,
+ crate::large_stack_arrays::LARGE_STACK_ARRAYS_INFO,
+ crate::len_zero::COMPARISON_TO_EMPTY_INFO,
+ crate::len_zero::LEN_WITHOUT_IS_EMPTY_INFO,
+ crate::len_zero::LEN_ZERO_INFO,
+ crate::let_if_seq::USELESS_LET_IF_SEQ_INFO,
+ crate::let_underscore::LET_UNDERSCORE_FUTURE_INFO,
+ crate::let_underscore::LET_UNDERSCORE_LOCK_INFO,
+ crate::let_underscore::LET_UNDERSCORE_MUST_USE_INFO,
+ crate::lifetimes::EXTRA_UNUSED_LIFETIMES_INFO,
+ crate::lifetimes::NEEDLESS_LIFETIMES_INFO,
+ crate::literal_representation::DECIMAL_LITERAL_REPRESENTATION_INFO,
+ crate::literal_representation::INCONSISTENT_DIGIT_GROUPING_INFO,
+ crate::literal_representation::LARGE_DIGIT_GROUPS_INFO,
+ crate::literal_representation::MISTYPED_LITERAL_SUFFIXES_INFO,
+ crate::literal_representation::UNREADABLE_LITERAL_INFO,
+ crate::literal_representation::UNUSUAL_BYTE_GROUPINGS_INFO,
+ crate::loops::EMPTY_LOOP_INFO,
+ crate::loops::EXPLICIT_COUNTER_LOOP_INFO,
+ crate::loops::EXPLICIT_INTO_ITER_LOOP_INFO,
+ crate::loops::EXPLICIT_ITER_LOOP_INFO,
+ crate::loops::FOR_KV_MAP_INFO,
+ crate::loops::ITER_NEXT_LOOP_INFO,
+ crate::loops::MANUAL_FIND_INFO,
+ crate::loops::MANUAL_FLATTEN_INFO,
+ crate::loops::MANUAL_MEMCPY_INFO,
+ crate::loops::MISSING_SPIN_LOOP_INFO,
+ crate::loops::MUT_RANGE_BOUND_INFO,
+ crate::loops::NEEDLESS_RANGE_LOOP_INFO,
+ crate::loops::NEVER_LOOP_INFO,
+ crate::loops::SAME_ITEM_PUSH_INFO,
+ crate::loops::SINGLE_ELEMENT_LOOP_INFO,
+ crate::loops::WHILE_IMMUTABLE_CONDITION_INFO,
+ crate::loops::WHILE_LET_LOOP_INFO,
+ crate::loops::WHILE_LET_ON_ITERATOR_INFO,
+ crate::macro_use::MACRO_USE_IMPORTS_INFO,
+ crate::main_recursion::MAIN_RECURSION_INFO,
+ crate::manual_assert::MANUAL_ASSERT_INFO,
+ crate::manual_async_fn::MANUAL_ASYNC_FN_INFO,
+ crate::manual_bits::MANUAL_BITS_INFO,
+ crate::manual_clamp::MANUAL_CLAMP_INFO,
+ crate::manual_is_ascii_check::MANUAL_IS_ASCII_CHECK_INFO,
+ crate::manual_let_else::MANUAL_LET_ELSE_INFO,
+ crate::manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE_INFO,
+ crate::manual_rem_euclid::MANUAL_REM_EUCLID_INFO,
+ crate::manual_retain::MANUAL_RETAIN_INFO,
+ crate::manual_string_new::MANUAL_STRING_NEW_INFO,
+ crate::manual_strip::MANUAL_STRIP_INFO,
+ crate::map_unit_fn::OPTION_MAP_UNIT_FN_INFO,
+ crate::map_unit_fn::RESULT_MAP_UNIT_FN_INFO,
+ crate::match_result_ok::MATCH_RESULT_OK_INFO,
+ crate::matches::COLLAPSIBLE_MATCH_INFO,
+ crate::matches::INFALLIBLE_DESTRUCTURING_MATCH_INFO,
+ crate::matches::MANUAL_FILTER_INFO,
+ crate::matches::MANUAL_MAP_INFO,
+ crate::matches::MANUAL_UNWRAP_OR_INFO,
+ crate::matches::MATCH_AS_REF_INFO,
+ crate::matches::MATCH_BOOL_INFO,
+ crate::matches::MATCH_LIKE_MATCHES_MACRO_INFO,
+ crate::matches::MATCH_ON_VEC_ITEMS_INFO,
+ crate::matches::MATCH_OVERLAPPING_ARM_INFO,
+ crate::matches::MATCH_REF_PATS_INFO,
+ crate::matches::MATCH_SAME_ARMS_INFO,
+ crate::matches::MATCH_SINGLE_BINDING_INFO,
+ crate::matches::MATCH_STR_CASE_MISMATCH_INFO,
+ crate::matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS_INFO,
+ crate::matches::MATCH_WILD_ERR_ARM_INFO,
+ crate::matches::NEEDLESS_MATCH_INFO,
+ crate::matches::REDUNDANT_PATTERN_MATCHING_INFO,
+ crate::matches::REST_PAT_IN_FULLY_BOUND_STRUCTS_INFO,
+ crate::matches::SIGNIFICANT_DROP_IN_SCRUTINEE_INFO,
+ crate::matches::SINGLE_MATCH_INFO,
+ crate::matches::SINGLE_MATCH_ELSE_INFO,
+ crate::matches::TRY_ERR_INFO,
+ crate::matches::WILDCARD_ENUM_MATCH_ARM_INFO,
+ crate::matches::WILDCARD_IN_OR_PATTERNS_INFO,
+ crate::mem_forget::MEM_FORGET_INFO,
+ crate::mem_replace::MEM_REPLACE_OPTION_WITH_NONE_INFO,
+ crate::mem_replace::MEM_REPLACE_WITH_DEFAULT_INFO,
+ crate::mem_replace::MEM_REPLACE_WITH_UNINIT_INFO,
+ crate::methods::BIND_INSTEAD_OF_MAP_INFO,
+ crate::methods::BYTES_COUNT_TO_LEN_INFO,
+ crate::methods::BYTES_NTH_INFO,
+ crate::methods::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS_INFO,
+ crate::methods::CHARS_LAST_CMP_INFO,
+ crate::methods::CHARS_NEXT_CMP_INFO,
+ crate::methods::CLONED_INSTEAD_OF_COPIED_INFO,
+ crate::methods::CLONE_DOUBLE_REF_INFO,
+ crate::methods::CLONE_ON_COPY_INFO,
+ crate::methods::CLONE_ON_REF_PTR_INFO,
+ crate::methods::COLLAPSIBLE_STR_REPLACE_INFO,
+ crate::methods::ERR_EXPECT_INFO,
+ crate::methods::EXPECT_FUN_CALL_INFO,
+ crate::methods::EXPECT_USED_INFO,
+ crate::methods::EXTEND_WITH_DRAIN_INFO,
+ crate::methods::FILETYPE_IS_FILE_INFO,
+ crate::methods::FILTER_MAP_IDENTITY_INFO,
+ crate::methods::FILTER_MAP_NEXT_INFO,
+ crate::methods::FILTER_NEXT_INFO,
+ crate::methods::FLAT_MAP_IDENTITY_INFO,
+ crate::methods::FLAT_MAP_OPTION_INFO,
+ crate::methods::FROM_ITER_INSTEAD_OF_COLLECT_INFO,
+ crate::methods::GET_FIRST_INFO,
+ crate::methods::GET_LAST_WITH_LEN_INFO,
+ crate::methods::GET_UNWRAP_INFO,
+ crate::methods::IMPLICIT_CLONE_INFO,
+ crate::methods::INEFFICIENT_TO_STRING_INFO,
+ crate::methods::INSPECT_FOR_EACH_INFO,
+ crate::methods::INTO_ITER_ON_REF_INFO,
+ crate::methods::IS_DIGIT_ASCII_RADIX_INFO,
+ crate::methods::ITERATOR_STEP_BY_ZERO_INFO,
+ crate::methods::ITER_CLONED_COLLECT_INFO,
+ crate::methods::ITER_COUNT_INFO,
+ crate::methods::ITER_KV_MAP_INFO,
+ crate::methods::ITER_NEXT_SLICE_INFO,
+ crate::methods::ITER_NTH_INFO,
+ crate::methods::ITER_NTH_ZERO_INFO,
+ crate::methods::ITER_ON_EMPTY_COLLECTIONS_INFO,
+ crate::methods::ITER_ON_SINGLE_ITEMS_INFO,
+ crate::methods::ITER_OVEREAGER_CLONED_INFO,
+ crate::methods::ITER_SKIP_NEXT_INFO,
+ crate::methods::ITER_WITH_DRAIN_INFO,
+ crate::methods::MANUAL_FILTER_MAP_INFO,
+ crate::methods::MANUAL_FIND_MAP_INFO,
+ crate::methods::MANUAL_OK_OR_INFO,
+ crate::methods::MANUAL_SATURATING_ARITHMETIC_INFO,
+ crate::methods::MANUAL_SPLIT_ONCE_INFO,
+ crate::methods::MANUAL_STR_REPEAT_INFO,
+ crate::methods::MAP_CLONE_INFO,
+ crate::methods::MAP_COLLECT_RESULT_UNIT_INFO,
+ crate::methods::MAP_ERR_IGNORE_INFO,
+ crate::methods::MAP_FLATTEN_INFO,
+ crate::methods::MAP_IDENTITY_INFO,
+ crate::methods::MAP_UNWRAP_OR_INFO,
+ crate::methods::MUT_MUTEX_LOCK_INFO,
+ crate::methods::NAIVE_BYTECOUNT_INFO,
+ crate::methods::NEEDLESS_COLLECT_INFO,
+ crate::methods::NEEDLESS_OPTION_AS_DEREF_INFO,
+ crate::methods::NEEDLESS_OPTION_TAKE_INFO,
+ crate::methods::NEEDLESS_SPLITN_INFO,
+ crate::methods::NEW_RET_NO_SELF_INFO,
+ crate::methods::NONSENSICAL_OPEN_OPTIONS_INFO,
+ crate::methods::NO_EFFECT_REPLACE_INFO,
+ crate::methods::OBFUSCATED_IF_ELSE_INFO,
+ crate::methods::OK_EXPECT_INFO,
+ crate::methods::OPTION_AS_REF_DEREF_INFO,
+ crate::methods::OPTION_FILTER_MAP_INFO,
+ crate::methods::OPTION_MAP_OR_NONE_INFO,
+ crate::methods::OR_FUN_CALL_INFO,
+ crate::methods::OR_THEN_UNWRAP_INFO,
+ crate::methods::PATH_BUF_PUSH_OVERWRITE_INFO,
+ crate::methods::RANGE_ZIP_WITH_LEN_INFO,
+ crate::methods::REPEAT_ONCE_INFO,
+ crate::methods::RESULT_MAP_OR_INTO_OPTION_INFO,
+ crate::methods::SEARCH_IS_SOME_INFO,
+ crate::methods::SEEK_FROM_CURRENT_INFO,
+ crate::methods::SEEK_TO_START_INSTEAD_OF_REWIND_INFO,
+ crate::methods::SHOULD_IMPLEMENT_TRAIT_INFO,
+ crate::methods::SINGLE_CHAR_ADD_STR_INFO,
+ crate::methods::SINGLE_CHAR_PATTERN_INFO,
+ crate::methods::SKIP_WHILE_NEXT_INFO,
+ crate::methods::STABLE_SORT_PRIMITIVE_INFO,
+ crate::methods::STRING_EXTEND_CHARS_INFO,
+ crate::methods::SUSPICIOUS_MAP_INFO,
+ crate::methods::SUSPICIOUS_SPLITN_INFO,
+ crate::methods::SUSPICIOUS_TO_OWNED_INFO,
+ crate::methods::UNINIT_ASSUMED_INIT_INFO,
+ crate::methods::UNIT_HASH_INFO,
+ crate::methods::UNNECESSARY_FILTER_MAP_INFO,
+ crate::methods::UNNECESSARY_FIND_MAP_INFO,
+ crate::methods::UNNECESSARY_FOLD_INFO,
+ crate::methods::UNNECESSARY_JOIN_INFO,
+ crate::methods::UNNECESSARY_LAZY_EVALUATIONS_INFO,
+ crate::methods::UNNECESSARY_SORT_BY_INFO,
+ crate::methods::UNNECESSARY_TO_OWNED_INFO,
+ crate::methods::UNWRAP_OR_ELSE_DEFAULT_INFO,
+ crate::methods::UNWRAP_USED_INFO,
+ crate::methods::USELESS_ASREF_INFO,
+ crate::methods::VEC_RESIZE_TO_ZERO_INFO,
+ crate::methods::VERBOSE_FILE_READS_INFO,
+ crate::methods::WRONG_SELF_CONVENTION_INFO,
+ crate::methods::ZST_OFFSET_INFO,
+ crate::minmax::MIN_MAX_INFO,
+ crate::misc::SHORT_CIRCUIT_STATEMENT_INFO,
+ crate::misc::TOPLEVEL_REF_ARG_INFO,
+ crate::misc::USED_UNDERSCORE_BINDING_INFO,
+ crate::misc::ZERO_PTR_INFO,
+ crate::misc_early::BUILTIN_TYPE_SHADOW_INFO,
+ crate::misc_early::DOUBLE_NEG_INFO,
+ crate::misc_early::DUPLICATE_UNDERSCORE_ARGUMENT_INFO,
+ crate::misc_early::MIXED_CASE_HEX_LITERALS_INFO,
+ crate::misc_early::REDUNDANT_PATTERN_INFO,
+ crate::misc_early::SEPARATED_LITERAL_SUFFIX_INFO,
+ crate::misc_early::UNNEEDED_FIELD_PATTERN_INFO,
+ crate::misc_early::UNNEEDED_WILDCARD_PATTERN_INFO,
+ crate::misc_early::UNSEPARATED_LITERAL_SUFFIX_INFO,
+ crate::misc_early::ZERO_PREFIXED_LITERAL_INFO,
+ crate::mismatching_type_param_order::MISMATCHING_TYPE_PARAM_ORDER_INFO,
+ crate::missing_const_for_fn::MISSING_CONST_FOR_FN_INFO,
+ crate::missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS_INFO,
+ crate::missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES_INFO,
+ crate::missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS_INFO,
+ crate::missing_trait_methods::MISSING_TRAIT_METHODS_INFO,
+ crate::mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION_INFO,
+ crate::mixed_read_write_in_expression::MIXED_READ_WRITE_IN_EXPRESSION_INFO,
+ crate::module_style::MOD_MODULE_FILES_INFO,
+ crate::module_style::SELF_NAMED_MODULE_FILES_INFO,
+ crate::multi_assignments::MULTI_ASSIGNMENTS_INFO,
+ crate::mut_key::MUTABLE_KEY_TYPE_INFO,
+ crate::mut_mut::MUT_MUT_INFO,
+ crate::mut_reference::UNNECESSARY_MUT_PASSED_INFO,
+ crate::mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL_INFO,
+ crate::mutex_atomic::MUTEX_ATOMIC_INFO,
+ crate::mutex_atomic::MUTEX_INTEGER_INFO,
+ crate::needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE_INFO,
+ crate::needless_bool::BOOL_COMPARISON_INFO,
+ crate::needless_bool::NEEDLESS_BOOL_INFO,
+ crate::needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE_INFO,
+ crate::needless_continue::NEEDLESS_CONTINUE_INFO,
+ crate::needless_for_each::NEEDLESS_FOR_EACH_INFO,
+ crate::needless_late_init::NEEDLESS_LATE_INIT_INFO,
+ crate::needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS_INFO,
+ crate::needless_pass_by_value::NEEDLESS_PASS_BY_VALUE_INFO,
+ crate::needless_question_mark::NEEDLESS_QUESTION_MARK_INFO,
+ crate::needless_update::NEEDLESS_UPDATE_INFO,
+ crate::neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD_INFO,
+ crate::neg_multiply::NEG_MULTIPLY_INFO,
+ crate::new_without_default::NEW_WITHOUT_DEFAULT_INFO,
+ crate::no_effect::NO_EFFECT_INFO,
+ crate::no_effect::NO_EFFECT_UNDERSCORE_BINDING_INFO,
+ crate::no_effect::UNNECESSARY_OPERATION_INFO,
+ crate::non_copy_const::BORROW_INTERIOR_MUTABLE_CONST_INFO,
+ crate::non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST_INFO,
+ crate::non_expressive_names::JUST_UNDERSCORES_AND_DIGITS_INFO,
+ crate::non_expressive_names::MANY_SINGLE_CHAR_NAMES_INFO,
+ crate::non_expressive_names::SIMILAR_NAMES_INFO,
+ crate::non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS_INFO,
+ crate::non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY_INFO,
+ crate::nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES_INFO,
+ crate::octal_escapes::OCTAL_ESCAPES_INFO,
+ crate::only_used_in_recursion::ONLY_USED_IN_RECURSION_INFO,
+ crate::operators::ABSURD_EXTREME_COMPARISONS_INFO,
+ crate::operators::ARITHMETIC_SIDE_EFFECTS_INFO,
+ crate::operators::ASSIGN_OP_PATTERN_INFO,
+ crate::operators::BAD_BIT_MASK_INFO,
+ crate::operators::CMP_NAN_INFO,
+ crate::operators::CMP_OWNED_INFO,
+ crate::operators::DOUBLE_COMPARISONS_INFO,
+ crate::operators::DURATION_SUBSEC_INFO,
+ crate::operators::EQ_OP_INFO,
+ crate::operators::ERASING_OP_INFO,
+ crate::operators::FLOAT_ARITHMETIC_INFO,
+ crate::operators::FLOAT_CMP_INFO,
+ crate::operators::FLOAT_CMP_CONST_INFO,
+ crate::operators::FLOAT_EQUALITY_WITHOUT_ABS_INFO,
+ crate::operators::IDENTITY_OP_INFO,
+ crate::operators::INEFFECTIVE_BIT_MASK_INFO,
+ crate::operators::INTEGER_ARITHMETIC_INFO,
+ crate::operators::INTEGER_DIVISION_INFO,
+ crate::operators::MISREFACTORED_ASSIGN_OP_INFO,
+ crate::operators::MODULO_ARITHMETIC_INFO,
+ crate::operators::MODULO_ONE_INFO,
+ crate::operators::NEEDLESS_BITWISE_BOOL_INFO,
+ crate::operators::OP_REF_INFO,
+ crate::operators::PTR_EQ_INFO,
+ crate::operators::SELF_ASSIGNMENT_INFO,
+ crate::operators::VERBOSE_BIT_MASK_INFO,
+ crate::option_env_unwrap::OPTION_ENV_UNWRAP_INFO,
+ crate::option_if_let_else::OPTION_IF_LET_ELSE_INFO,
+ crate::overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL_INFO,
+ crate::panic_in_result_fn::PANIC_IN_RESULT_FN_INFO,
+ crate::panic_unimplemented::PANIC_INFO,
+ crate::panic_unimplemented::TODO_INFO,
+ crate::panic_unimplemented::UNIMPLEMENTED_INFO,
+ crate::panic_unimplemented::UNREACHABLE_INFO,
+ crate::partial_pub_fields::PARTIAL_PUB_FIELDS_INFO,
+ crate::partialeq_ne_impl::PARTIALEQ_NE_IMPL_INFO,
+ crate::partialeq_to_none::PARTIALEQ_TO_NONE_INFO,
+ crate::pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE_INFO,
+ crate::pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF_INFO,
+ crate::pattern_type_mismatch::PATTERN_TYPE_MISMATCH_INFO,
+ crate::precedence::PRECEDENCE_INFO,
+ crate::ptr::CMP_NULL_INFO,
+ crate::ptr::INVALID_NULL_PTR_USAGE_INFO,
+ crate::ptr::MUT_FROM_REF_INFO,
+ crate::ptr::PTR_ARG_INFO,
+ crate::ptr_offset_with_cast::PTR_OFFSET_WITH_CAST_INFO,
+ crate::pub_use::PUB_USE_INFO,
+ crate::question_mark::QUESTION_MARK_INFO,
+ crate::ranges::MANUAL_RANGE_CONTAINS_INFO,
+ crate::ranges::RANGE_MINUS_ONE_INFO,
+ crate::ranges::RANGE_PLUS_ONE_INFO,
+ crate::ranges::REVERSED_EMPTY_RANGES_INFO,
+ crate::rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT_INFO,
+ crate::read_zero_byte_vec::READ_ZERO_BYTE_VEC_INFO,
+ crate::redundant_clone::REDUNDANT_CLONE_INFO,
+ crate::redundant_closure_call::REDUNDANT_CLOSURE_CALL_INFO,
+ crate::redundant_else::REDUNDANT_ELSE_INFO,
+ crate::redundant_field_names::REDUNDANT_FIELD_NAMES_INFO,
+ crate::redundant_pub_crate::REDUNDANT_PUB_CRATE_INFO,
+ crate::redundant_slicing::DEREF_BY_SLICING_INFO,
+ crate::redundant_slicing::REDUNDANT_SLICING_INFO,
+ crate::redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES_INFO,
+ crate::ref_option_ref::REF_OPTION_REF_INFO,
+ crate::reference::DEREF_ADDROF_INFO,
+ crate::regex::INVALID_REGEX_INFO,
+ crate::regex::TRIVIAL_REGEX_INFO,
+ crate::return_self_not_must_use::RETURN_SELF_NOT_MUST_USE_INFO,
+ crate::returns::LET_AND_RETURN_INFO,
+ crate::returns::NEEDLESS_RETURN_INFO,
+ crate::same_name_method::SAME_NAME_METHOD_INFO,
+ crate::self_named_constructors::SELF_NAMED_CONSTRUCTORS_INFO,
++ crate::semicolon_block::SEMICOLON_INSIDE_BLOCK_INFO,
++ crate::semicolon_block::SEMICOLON_OUTSIDE_BLOCK_INFO,
+ crate::semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED_INFO,
+ crate::serde_api::SERDE_API_MISUSE_INFO,
+ crate::shadow::SHADOW_REUSE_INFO,
+ crate::shadow::SHADOW_SAME_INFO,
+ crate::shadow::SHADOW_UNRELATED_INFO,
+ crate::single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES_INFO,
+ crate::single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS_INFO,
+ crate::size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT_INFO,
+ crate::slow_vector_initialization::SLOW_VECTOR_INITIALIZATION_INFO,
+ crate::std_instead_of_core::ALLOC_INSTEAD_OF_CORE_INFO,
+ crate::std_instead_of_core::STD_INSTEAD_OF_ALLOC_INFO,
+ crate::std_instead_of_core::STD_INSTEAD_OF_CORE_INFO,
+ crate::strings::STRING_ADD_INFO,
+ crate::strings::STRING_ADD_ASSIGN_INFO,
+ crate::strings::STRING_FROM_UTF8_AS_BYTES_INFO,
+ crate::strings::STRING_LIT_AS_BYTES_INFO,
+ crate::strings::STRING_SLICE_INFO,
+ crate::strings::STRING_TO_STRING_INFO,
+ crate::strings::STR_TO_STRING_INFO,
+ crate::strings::TRIM_SPLIT_WHITESPACE_INFO,
+ crate::strlen_on_c_strings::STRLEN_ON_C_STRINGS_INFO,
+ crate::suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS_INFO,
+ crate::suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL_INFO,
+ crate::suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL_INFO,
+ crate::suspicious_xor_used_as_pow::SUSPICIOUS_XOR_USED_AS_POW_INFO,
+ crate::swap::ALMOST_SWAPPED_INFO,
+ crate::swap::MANUAL_SWAP_INFO,
+ crate::swap_ptr_to_ref::SWAP_PTR_TO_REF_INFO,
+ crate::tabs_in_doc_comments::TABS_IN_DOC_COMMENTS_INFO,
+ crate::temporary_assignment::TEMPORARY_ASSIGNMENT_INFO,
+ crate::to_digit_is_some::TO_DIGIT_IS_SOME_INFO,
+ crate::trailing_empty_array::TRAILING_EMPTY_ARRAY_INFO,
+ crate::trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS_INFO,
+ crate::trait_bounds::TYPE_REPETITION_IN_BOUNDS_INFO,
+ crate::transmute::CROSSPOINTER_TRANSMUTE_INFO,
+ crate::transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS_INFO,
+ crate::transmute::TRANSMUTE_BYTES_TO_STR_INFO,
+ crate::transmute::TRANSMUTE_FLOAT_TO_INT_INFO,
+ crate::transmute::TRANSMUTE_INT_TO_BOOL_INFO,
+ crate::transmute::TRANSMUTE_INT_TO_CHAR_INFO,
+ crate::transmute::TRANSMUTE_INT_TO_FLOAT_INFO,
+ crate::transmute::TRANSMUTE_NUM_TO_BYTES_INFO,
+ crate::transmute::TRANSMUTE_PTR_TO_PTR_INFO,
+ crate::transmute::TRANSMUTE_PTR_TO_REF_INFO,
+ crate::transmute::TRANSMUTE_UNDEFINED_REPR_INFO,
+ crate::transmute::TRANSMUTING_NULL_INFO,
+ crate::transmute::UNSOUND_COLLECTION_TRANSMUTE_INFO,
+ crate::transmute::USELESS_TRANSMUTE_INFO,
+ crate::transmute::WRONG_TRANSMUTE_INFO,
+ crate::types::BORROWED_BOX_INFO,
+ crate::types::BOX_COLLECTION_INFO,
+ crate::types::LINKEDLIST_INFO,
+ crate::types::OPTION_OPTION_INFO,
+ crate::types::RC_BUFFER_INFO,
+ crate::types::RC_MUTEX_INFO,
+ crate::types::REDUNDANT_ALLOCATION_INFO,
+ crate::types::TYPE_COMPLEXITY_INFO,
+ crate::types::VEC_BOX_INFO,
+ crate::undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS_INFO,
+ crate::undocumented_unsafe_blocks::UNNECESSARY_SAFETY_COMMENT_INFO,
+ crate::unicode::INVISIBLE_CHARACTERS_INFO,
+ crate::unicode::NON_ASCII_LITERAL_INFO,
+ crate::unicode::UNICODE_NOT_NFC_INFO,
+ crate::uninit_vec::UNINIT_VEC_INFO,
+ crate::unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD_INFO,
+ crate::unit_types::LET_UNIT_VALUE_INFO,
+ crate::unit_types::UNIT_ARG_INFO,
+ crate::unit_types::UNIT_CMP_INFO,
+ crate::unnamed_address::FN_ADDRESS_COMPARISONS_INFO,
+ crate::unnamed_address::VTABLE_ADDRESS_COMPARISONS_INFO,
+ crate::unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS_INFO,
+ crate::unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS_INFO,
+ crate::unnecessary_wraps::UNNECESSARY_WRAPS_INFO,
+ crate::unnested_or_patterns::UNNESTED_OR_PATTERNS_INFO,
+ crate::unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME_INFO,
+ crate::unused_async::UNUSED_ASYNC_INFO,
+ crate::unused_io_amount::UNUSED_IO_AMOUNT_INFO,
+ crate::unused_peekable::UNUSED_PEEKABLE_INFO,
+ crate::unused_rounding::UNUSED_ROUNDING_INFO,
+ crate::unused_self::UNUSED_SELF_INFO,
+ crate::unused_unit::UNUSED_UNIT_INFO,
+ crate::unwrap::PANICKING_UNWRAP_INFO,
+ crate::unwrap::UNNECESSARY_UNWRAP_INFO,
+ crate::unwrap_in_result::UNWRAP_IN_RESULT_INFO,
+ crate::upper_case_acronyms::UPPER_CASE_ACRONYMS_INFO,
+ crate::use_self::USE_SELF_INFO,
+ crate::useless_conversion::USELESS_CONVERSION_INFO,
+ crate::vec::USELESS_VEC_INFO,
+ crate::vec_init_then_push::VEC_INIT_THEN_PUSH_INFO,
+ crate::wildcard_imports::ENUM_GLOB_USE_INFO,
+ crate::wildcard_imports::WILDCARD_IMPORTS_INFO,
+ crate::write::PRINTLN_EMPTY_STRING_INFO,
+ crate::write::PRINT_LITERAL_INFO,
+ crate::write::PRINT_STDERR_INFO,
+ crate::write::PRINT_STDOUT_INFO,
+ crate::write::PRINT_WITH_NEWLINE_INFO,
+ crate::write::USE_DEBUG_INFO,
+ crate::write::WRITELN_EMPTY_STRING_INFO,
+ crate::write::WRITE_LITERAL_INFO,
+ crate::write::WRITE_WITH_NEWLINE_INFO,
+ crate::zero_div_zero::ZERO_DIVIDED_BY_ZERO_INFO,
+ crate::zero_sized_map_values::ZERO_SIZED_MAP_VALUES_INFO,
+];
--- /dev/null
- ty::Alias(ty::Projection, _) if ty.has_non_region_param() => TyPosition::new_deref_stable_for_result(precedence, ty),
- ty::Infer(_) | ty::Error(_) | ty::Bound(..) | ty::Alias(ty::Opaque, ..) | ty::Placeholder(_) | ty::Dynamic(..) => {
- Position::ReborrowStable(precedence).into()
+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::msrvs::{self, Msrv};
+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, path_to_local, walk_to_expr_usage,
+};
+
+use rustc_ast::util::parser::{PREC_POSTFIX, PREC_PREFIX};
+use rustc_data_structures::fx::FxIndexMap;
+use rustc_data_structures::graph::iterate::{CycleDetector, TriColorDepthFirstSearch};
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_ty, Visitor};
+use rustc_hir::{
+ 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, Clause, EarlyBinder, FnSig, GenericArgKind, List, ParamTy, PredicateKind,
+ ProjectionPredicate, Ty, TyCtxt, TypeVisitable, TypeckResults,
+};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{symbol::sym, Span, Symbol};
+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"
+}
+
+impl_lint_pass!(Dereferencing<'_> => [
+ EXPLICIT_DEREF_METHODS,
+ NEEDLESS_BORROW,
+ REF_BINDING_TO_REFERENCE,
+ EXPLICIT_AUTO_DEREF,
+]);
+
+#[derive(Default)]
+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: Msrv,
+}
+
+impl<'tcx> Dereferencing<'tcx> {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> 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,
+}
+
+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 Some((kind, sub_expr)) = try_parse_ref_op(cx.tcx, typeck, expr) 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);
+ let (position, adjustments) = walk_parents(cx, &mut self.possible_borrowers, expr, &self.msrv);
+ match kind {
+ RefOp::Deref => {
+ let sub_ty = typeck.expr_ty(sub_expr);
+ if let Position::FieldAccess {
+ name,
+ of_union: false,
+ } = position
+ && !ty_contains_field(sub_ty, name)
+ {
+ self.state = Some((
+ State::ExplicitDerefField { name },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable() && sub_ty.is_ref() {
+ 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: &Msrv,
+) -> (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(..),
+ owner_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ owner_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ owner_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let ty = cx.tcx.type_of(owner_id.def_id);
+ Some(ty_auto_deref_stability(cx, ty, precedence).position_for_result(cx))
+ },
+
+ Node::Item(&Item {
+ kind: ItemKind::Fn(..),
+ owner_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Fn(..),
+ owner_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(..),
+ owner_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let output = cx
+ .tcx
+ .erase_late_bound_regions(cx.tcx.fn_sig(owner_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 => {
+ // `e.hir_id == child_id` for https://github.com/rust-lang/rust-clippy/issues/9739
+ // `!call_is_qualified(func)` for https://github.com/rust-lang/rust-clippy/issues/9782
+ if e.hir_id == child_id
+ && !call_is_qualified(func)
+ && let ty::Param(param_ty) = ty.skip_binder().kind()
+ {
+ 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(method, 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 = cx
+ .typeck_results()
+ .node_substs_opt(parent.hir_id).map(|subs| &subs[1..]).unwrap_or_default()
+ && 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.into()].into_iter().chain(subs.iter().copied()),
+ 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];
+ // `e.hir_id == child_id` for https://github.com/rust-lang/rust-clippy/issues/9739
+ // `method.args.is_none()` for https://github.com/rust-lang/rust-clippy/issues/9782
+ if e.hir_id == child_id && method.args.is_none() && let ty::Param(param_ty) = ty.kind() {
+ 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, 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, 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
+}
+
+fn call_is_qualified(expr: &Expr<'_>) -> bool {
+ if let ExprKind::Path(path) = &expr.kind {
+ match path {
+ QPath::Resolved(_, path) => path.segments.last().map_or(false, |segment| segment.args.is_some()),
+ QPath::TypeRelative(_, segment) => segment.args.is_some(),
+ QPath::LangItem(..) => false,
+ }
+ } else {
+ false
+ }
+}
+
+// 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, clippy::too_many_lines)]
+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: &Msrv,
+) -> 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::Clause(Clause::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::Clause(Clause::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);
+ }
+
+ // See:
+ // - https://github.com/rust-lang/rust-clippy/pull/9674#issuecomment-1289294201
+ // - https://github.com/rust-lang/rust-clippy/pull/9674#issuecomment-1292225232
+ if projection_predicates
+ .iter()
+ .any(|projection_predicate| is_mixed_projection_predicate(cx, callee_def_id, projection_predicate))
+ {
+ 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();
+
+ let mut check_reference_and_referent = |reference, referent| {
+ let referent_ty = cx.typeck_results().expr_ty(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::Clause(Clause::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()
+ && !msrv.meets(msrvs::ARRAY_INTO_ITERATOR)
+ {
+ return false;
+ }
+
+ let predicate = EarlyBinder(predicate).subst(cx.tcx, &substs_with_referent_ty);
+ let obligation = Obligation::new(cx.tcx, 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 {
+ 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 is_mixed_projection_predicate<'tcx>(
+ cx: &LateContext<'tcx>,
+ callee_def_id: DefId,
+ projection_predicate: &ProjectionPredicate<'tcx>,
+) -> bool {
+ let generics = cx.tcx.generics_of(callee_def_id);
+ // The predicate requires the projected type to equal a type parameter from the parent context.
+ if let Some(term_ty) = projection_predicate.term.ty()
+ && let ty::Param(term_param_ty) = term_ty.kind()
+ && (term_param_ty.index as usize) < generics.parent_count
+ {
+ // The inner-most self type is a type parameter from the current function.
+ let mut projection_ty = projection_predicate.projection_ty;
+ loop {
+ match projection_ty.self_ty().kind() {
+ ty::Alias(ty::Projection, inner_projection_ty) => {
+ projection_ty = *inner_projection_ty;
+ }
+ ty::Param(param_ty) => {
+ return (param_ty.index as usize) >= generics.parent_count;
+ }
+ _ => {
+ return false;
+ }
+ }
+ }
+ } 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()
+ // Ensure not in a loop (https://github.com/rust-lang/rust-clippy/issues/9710)
+ && TriColorDepthFirstSearch::new(&mir.basic_blocks).run_from(location.block, &mut CycleDetector).is_none()
+ {
+ 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.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, 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::Alias(ty::Projection, _) if ty.has_non_region_param() => {
++ TyPosition::new_deref_stable_for_result(precedence, ty)
+ },
++ ty::Infer(_)
++ | ty::Error(_)
++ | ty::Bound(..)
++ | ty::Alias(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::Alias(ty::Projection, _) => {
+ Position::DerefStable(precedence, ty.is_sized(cx.tcx, 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
- trait_ref: tcx.mk_trait_ref(
- eq_trait_id,
- [tcx.mk_param_from_def(param)],
- ),
+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, Clause, GenericParamDefKind, ImplPolarity, ParamEnv, PredicateKind, TraitPredicate,
+ 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.owner_id);
+ let is_automatically_derived = cx.tcx.has_attr(item.owner_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::Clause(Clause::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::Clause(Clause::Trait(TraitPredicate {
++ trait_ref: tcx.mk_trait_ref(eq_trait_id, [tcx.mk_param_from_def(param)]),
+ constness: BoundConstness::NotConst,
+ polarity: ImplPolarity::Positive,
+ }))))
+ }),
+ )),
+ Reveal::UserFacing,
+ Constness::NotConst,
+ )
+}
--- /dev/null
- #[clippy::version = "1.65.0"]
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::macros::macro_backtrace;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_hir::def_id::DefIdMap;
+use rustc_hir::{Expr, ForeignItem, HirId, ImplItem, Item, Pat, Path, Stmt, TraitItem, Ty};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{ExpnId, Span};
+
+use crate::utils::conf;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Denies the configured macros in clippy.toml
+ ///
+ /// Note: Even though this lint is warn-by-default, it will only trigger if
+ /// macros are defined in the clippy.toml file.
+ ///
+ /// ### Why is this bad?
+ /// Some macros 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-macros = [
+ /// # Can use a string as the path of the disallowed macro.
+ /// "std::print",
+ /// # Can also use an inline table with a `path` key.
+ /// { path = "std::println" },
+ /// # When using an inline table, can add a `reason` for why the macro
+ /// # is disallowed.
+ /// { path = "serde::Serialize", reason = "no serializing" },
+ /// ]
+ /// ```
+ /// ```
+ /// use serde::Serialize;
+ ///
+ /// // Example code where clippy issues a warning
+ /// println!("warns");
+ ///
+ /// // The diagnostic will contain the message "no serializing"
+ /// #[derive(Serialize)]
+ /// struct Data {
+ /// name: String,
+ /// value: usize,
+ /// }
+ /// ```
++ #[clippy::version = "1.66.0"]
+ pub DISALLOWED_MACROS,
+ style,
+ "use of a disallowed macro"
+}
+
+pub struct DisallowedMacros {
+ conf_disallowed: Vec<conf::DisallowedPath>,
+ disallowed: DefIdMap<usize>,
+ seen: FxHashSet<ExpnId>,
+}
+
+impl DisallowedMacros {
+ pub fn new(conf_disallowed: Vec<conf::DisallowedPath>) -> Self {
+ Self {
+ conf_disallowed,
+ disallowed: DefIdMap::default(),
+ seen: FxHashSet::default(),
+ }
+ }
+
+ fn check(&mut self, cx: &LateContext<'_>, span: Span) {
+ if self.conf_disallowed.is_empty() {
+ return;
+ }
+
+ for mac in macro_backtrace(span) {
+ if !self.seen.insert(mac.expn) {
+ return;
+ }
+
+ if let Some(&index) = self.disallowed.get(&mac.def_id) {
+ let conf = &self.conf_disallowed[index];
+
+ span_lint_and_then(
+ cx,
+ DISALLOWED_MACROS,
+ mac.span,
+ &format!("use of a disallowed macro `{}`", conf.path()),
+ |diag| {
+ if let Some(reason) = conf.reason() {
+ diag.note(reason);
+ }
+ },
+ );
+ }
+ }
+ }
+}
+
+impl_lint_pass!(DisallowedMacros => [DISALLOWED_MACROS]);
+
+impl LateLintPass<'_> for DisallowedMacros {
+ fn check_crate(&mut self, cx: &LateContext<'_>) {
+ for (index, conf) in self.conf_disallowed.iter().enumerate() {
+ let segs: Vec<_> = conf.path().split("::").collect();
+ for id in clippy_utils::def_path_def_ids(cx, &segs) {
+ self.disallowed.insert(id, index);
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+ self.check(cx, expr.span);
+ }
+
+ fn check_stmt(&mut self, cx: &LateContext<'_>, stmt: &Stmt<'_>) {
+ self.check(cx, stmt.span);
+ }
+
+ fn check_ty(&mut self, cx: &LateContext<'_>, ty: &Ty<'_>) {
+ self.check(cx, ty.span);
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'_>, pat: &Pat<'_>) {
+ self.check(cx, pat.span);
+ }
+
+ fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
+ self.check(cx, item.span);
+ self.check(cx, item.vis_span);
+ }
+
+ fn check_foreign_item(&mut self, cx: &LateContext<'_>, item: &ForeignItem<'_>) {
+ self.check(cx, item.span);
+ self.check(cx, item.vis_span);
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'_>, item: &ImplItem<'_>) {
+ self.check(cx, item.span);
+ self.check(cx, item.vis_span);
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'_>, item: &TraitItem<'_>) {
+ self.check(cx, item.span);
+ }
+
+ fn check_path(&mut self, cx: &LateContext<'_>, path: &Path<'_>, _: HirId) {
+ self.check(cx, path.span);
+ }
+}
--- /dev/null
- is_format_macro, is_panic, root_macro_call, Count, FormatArg, FormatArgsExpn, FormatParam, FormatParamUsage,
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::is_diag_trait_item;
+use clippy_utils::macros::FormatParamKind::{Implicit, Named, NamedInline, Numbered, Starred};
+use clippy_utils::macros::{
- #[clippy::version = "1.65.0"]
++ is_assert_macro, is_format_macro, is_panic, root_macro_call, Count, FormatArg, FormatArgsExpn, FormatParam,
++ FormatParamUsage,
+};
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use if_chain::if_chain;
+use itertools::Itertools;
+use rustc_errors::{
+ Applicability,
+ SuggestionStyle::{CompletelyHidden, ShowCode},
+};
+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_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$}");
+ /// format!("{var:.prec$}");
+ /// ```
+ ///
+ /// If allow-mixed-uninlined-format-args is set to false in clippy.toml,
+ /// the following code will also trigger the lint:
+ /// ```rust
+ /// # let var = 42;
+ /// format!("{} {}", var, 1+2);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let var = 42;
+ /// format!("{var} {}", 1+2);
+ /// ```
+ ///
+ /// ### Known Problems
+ ///
+ /// If a format string contains a numbered argument that cannot be inlined
+ /// nothing will be suggested, e.g. `println!("{0}={1}", var, 1+2)`.
- if call_site.edition() < Edition2021 && is_panic(cx, def_id) {
- // panic! before 2021 edition considers a single string argument as non-format
++ #[clippy::version = "1.66.0"]
+ pub UNINLINED_FORMAT_ARGS,
+ style,
+ "using non-inlined variables in `format!` calls"
+}
+
+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: Msrv,
+ ignore_mixed: bool,
+}
+
+impl FormatArgs {
+ #[must_use]
+ pub fn new(msrv: Msrv, allow_mixed_uninlined_format_args: bool) -> Self {
+ Self {
+ msrv,
+ ignore_mixed: allow_mixed_uninlined_format_args,
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for FormatArgs {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ 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;
+ }
+ 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 self.msrv.meets(msrvs::FORMAT_ARGS_CAPTURE) {
+ check_uninlined_args(cx, &format_args, outermost_expn_data.call_site, macro_def_id, self.ignore_mixed);
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+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,
+ ignore_mixed: bool,
+) {
+ if args.format_string.span.from_expansion() {
+ return;
+ }
++ if call_site.edition() < Edition2021 && (is_panic(cx, def_id) || is_assert_macro(cx, def_id)) {
++ // panic!, assert!, and debug_assert! 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, ignore_mixed)) || fixes.is_empty() {
+ return;
+ }
+
+ // multiline span display suggestion is sometimes broken: https://github.com/rust-lang/rust/pull/102729#discussion_r988704308
+ // in those cases, make the code suggestion hidden
+ let multiline_fix = fixes.iter().any(|(span, _)| cx.sess().source_map().is_multiline(*span));
+
+ span_lint_and_then(
+ cx,
+ UNINLINED_FORMAT_ARGS,
+ call_site,
+ "variables can be used directly in the `format!` string",
+ |diag| {
+ diag.multipart_suggestion_with_style(
+ "change this to",
+ fixes,
+ Applicability::MachineApplicable,
+ if multiline_fix { CompletelyHidden } else { ShowCode },
+ );
+ },
+ );
+}
+
+fn check_one_arg(
+ args: &FormatArgsExpn<'_>,
+ param: &FormatParam<'_>,
+ fixes: &mut Vec<(Span, String)>,
+ ignore_mixed: bool,
+) -> 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 {
+ // Do not continue inlining (return false) in case
+ // * if we can't inline a numbered argument, e.g. `print!("{0} ...", foo.bar, ...)`
+ // * if allow_mixed_uninlined_format_args is false and this arg hasn't been inlined already
+ param.kind != Numbered && (!ignore_mixed || matches!(param.kind, NamedInline(_)))
+ }
+}
+
+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();
+ 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 rustc_middle::hir::nested_filter::OnlyBodies;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::macros::span_is_local;
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::path_def_id;
+use clippy_utils::source::snippet_opt;
+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, ty};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+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: Msrv,
+}
+
+impl FromOverInto {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> 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 Item<'_>) {
+ if !self.msrv.meets(msrvs::RE_REBALANCING_COHERENCE) || !span_is_local(item.span) {
+ return;
+ }
+
+ 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.owner_id)
+ && cx.tcx.is_diagnostic_item(sym::Into, middle_trait_ref.def_id)
++ && !matches!(middle_trait_ref.substs.type_at(1).kind(), ty::Alias(ty::Opaque, _))
+ {
+ 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: &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
- #[clippy::version = "1.65.0"]
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::get_parent_expr;
+use clippy_utils::source::snippet_with_applicability;
+use if_chain::if_chain;
+use rustc_ast::ast::{LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Block, Expr, ExprKind, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{Int, IntTy, Ty, Uint, UintTy};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for implicit saturating addition.
+ ///
+ /// ### Why is this bad?
+ /// The built-in function is more readable and may be faster.
+ ///
+ /// ### Example
+ /// ```rust
+ ///let mut u:u32 = 7000;
+ ///
+ /// if u != u32::MAX {
+ /// u += 1;
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ ///let mut u:u32 = 7000;
+ ///
+ /// u = u.saturating_add(1);
+ /// ```
++ #[clippy::version = "1.66.0"]
+ pub IMPLICIT_SATURATING_ADD,
+ style,
+ "Perform saturating addition instead of implicitly checking max bound of data type"
+}
+declare_lint_pass!(ImplicitSaturatingAdd => [IMPLICIT_SATURATING_ADD]);
+
+impl<'tcx> LateLintPass<'tcx> for ImplicitSaturatingAdd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if_chain! {
+ if let ExprKind::If(cond, then, None) = expr.kind;
+ if let ExprKind::DropTemps(expr1) = cond.kind;
+ if let Some((c, op_node, l)) = get_const(cx, expr1);
+ if let BinOpKind::Ne | BinOpKind::Lt = op_node;
+ if let ExprKind::Block(block, None) = then.kind;
+ if let Block {
+ stmts:
+ [Stmt
+ { kind: StmtKind::Expr(ex) | StmtKind::Semi(ex), .. }],
+ expr: None, ..} |
+ Block { stmts: [], expr: Some(ex), ..} = block;
+ if let ExprKind::AssignOp(op1, target, value) = ex.kind;
+ let ty = cx.typeck_results().expr_ty(target);
+ if Some(c) == get_int_max(ty);
+ if clippy_utils::SpanlessEq::new(cx).eq_expr(l, target);
+ if BinOpKind::Add == op1.node;
+ if let ExprKind::Lit(ref lit) = value.kind;
+ if let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node;
+ if block.expr.is_none();
+ then {
+ let mut app = Applicability::MachineApplicable;
+ let code = snippet_with_applicability(cx, target.span, "_", &mut app);
+ let sugg = if let Some(parent) = get_parent_expr(cx, expr) && let ExprKind::If(_cond, _then, Some(else_)) = parent.kind && else_.hir_id == expr.hir_id {format!("{{{code} = {code}.saturating_add(1); }}")} else {format!("{code} = {code}.saturating_add(1);")};
+ span_lint_and_sugg(cx, IMPLICIT_SATURATING_ADD, expr.span, "manual saturating add detected", "use instead", sugg, app);
+ }
+ }
+ }
+}
+
+fn get_int_max(ty: Ty<'_>) -> Option<u128> {
+ match ty.peel_refs().kind() {
+ Int(IntTy::I8) => i8::max_value().try_into().ok(),
+ Int(IntTy::I16) => i16::max_value().try_into().ok(),
+ Int(IntTy::I32) => i32::max_value().try_into().ok(),
+ Int(IntTy::I64) => i64::max_value().try_into().ok(),
+ Int(IntTy::I128) => i128::max_value().try_into().ok(),
+ Int(IntTy::Isize) => isize::max_value().try_into().ok(),
+ Uint(UintTy::U8) => u8::max_value().try_into().ok(),
+ Uint(UintTy::U16) => u16::max_value().try_into().ok(),
+ Uint(UintTy::U32) => u32::max_value().try_into().ok(),
+ Uint(UintTy::U64) => u64::max_value().try_into().ok(),
+ Uint(UintTy::U128) => Some(u128::max_value()),
+ Uint(UintTy::Usize) => usize::max_value().try_into().ok(),
+ _ => None,
+ }
+}
+
+fn get_const<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>) -> Option<(u128, BinOpKind, &'tcx Expr<'tcx>)> {
+ if let ExprKind::Binary(op, l, r) = expr.kind {
+ let tr = cx.typeck_results();
+ if let Some((Constant::Int(c), _)) = constant(cx, tr, r) {
+ return Some((c, op.node, l));
+ };
+ if let Some((Constant::Int(c), _)) = constant(cx, tr, l) {
+ return Some((c, invert_op(op.node)?, r));
+ }
+ }
+ None
+}
+
+fn invert_op(op: BinOpKind) -> Option<BinOpKind> {
+ use rustc_hir::BinOpKind::{Ge, Gt, Le, Lt, Ne};
+ match op {
+ Lt => Some(Gt),
+ Le => Some(Ge),
+ Ne => Some(Ne),
+ Ge => Some(Le),
+ Gt => Some(Lt),
+ _ => None,
+ }
+}
--- /dev/null
- use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+//! lint on indexing and slicing operations
+
+use clippy_utils::consts::{constant, Constant};
- use rustc_session::{declare_lint_pass, declare_tool_lint};
++use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
+use clippy_utils::higher;
+use rustc_ast::ast::RangeLimits;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
- declare_lint_pass!(IndexingSlicing => [INDEXING_SLICING, OUT_OF_BOUNDS_INDEXING]);
++use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for out of bounds array indexing with a constant
+ /// index.
+ ///
+ /// ### Why is this bad?
+ /// This will always panic at runtime.
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// let x = [1, 2, 3, 4];
+ ///
+ /// x[9];
+ /// &x[2..9];
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = [1, 2, 3, 4];
+ /// // Index within bounds
+ ///
+ /// x[0];
+ /// x[3];
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OUT_OF_BOUNDS_INDEXING,
+ correctness,
+ "out of bounds constant indexing"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of indexing or slicing. Arrays are special cases, this lint
+ /// does report on arrays if we can tell that slicing operations are in bounds and does not
+ /// lint on constant `usize` indexing on arrays because that is handled by rustc's `const_err` lint.
+ ///
+ /// ### Why is this bad?
+ /// Indexing and slicing can panic at runtime and there are
+ /// safe alternatives.
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// // Vector
+ /// let x = vec![0; 5];
+ ///
+ /// x[2];
+ /// &x[2..100];
+ ///
+ /// // Array
+ /// let y = [0, 1, 2, 3];
+ ///
+ /// &y[10..100];
+ /// &y[10..];
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # #![allow(unused)]
+ ///
+ /// # let x = vec![0; 5];
+ /// # let y = [0, 1, 2, 3];
+ /// x.get(2);
+ /// x.get(2..100);
+ ///
+ /// y.get(10);
+ /// y.get(10..100);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INDEXING_SLICING,
+ restriction,
+ "indexing/slicing usage"
+}
+
- if cx.tcx.hir().is_inside_const_context(expr.hir_id) {
++impl_lint_pass!(IndexingSlicing => [INDEXING_SLICING, OUT_OF_BOUNDS_INDEXING]);
++
++#[derive(Copy, Clone)]
++pub struct IndexingSlicing {
++ suppress_restriction_lint_in_const: bool,
++}
++
++impl IndexingSlicing {
++ pub fn new(suppress_restriction_lint_in_const: bool) -> Self {
++ Self {
++ suppress_restriction_lint_in_const,
++ }
++ }
++}
+
+impl<'tcx> LateLintPass<'tcx> for IndexingSlicing {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
- span_lint_and_help(cx, INDEXING_SLICING, expr.span, "slicing may panic", None, help_msg);
++ if self.suppress_restriction_lint_in_const && cx.tcx.hir().is_inside_const_context(expr.hir_id) {
+ return;
+ }
+
+ if let ExprKind::Index(array, index) = &expr.kind {
++ let note = "the suggestion might not be applicable in constant blocks";
+ let ty = cx.typeck_results().expr_ty(array).peel_refs();
+ if let Some(range) = higher::Range::hir(index) {
+ // Ranged indexes, i.e., &x[n..m], &x[n..], &x[..n] and &x[..]
+ if let ty::Array(_, s) = ty.kind() {
+ let size: u128 = if let Some(size) = s.try_eval_usize(cx.tcx, cx.param_env) {
+ size.into()
+ } else {
+ return;
+ };
+
+ let const_range = to_const_range(cx, range, size);
+
+ if let (Some(start), _) = const_range {
+ if start > size {
+ span_lint(
+ cx,
+ OUT_OF_BOUNDS_INDEXING,
+ range.start.map_or(expr.span, |start| start.span),
+ "range is out of bounds",
+ );
+ return;
+ }
+ }
+
+ if let (_, Some(end)) = const_range {
+ if end > size {
+ span_lint(
+ cx,
+ OUT_OF_BOUNDS_INDEXING,
+ range.end.map_or(expr.span, |end| end.span),
+ "range is out of bounds",
+ );
+ return;
+ }
+ }
+
+ if let (Some(_), Some(_)) = const_range {
+ // early return because both start and end are constants
+ // and we have proven above that they are in bounds
+ return;
+ }
+ }
+
+ let help_msg = match (range.start, range.end) {
+ (None, Some(_)) => "consider using `.get(..n)`or `.get_mut(..n)` instead",
+ (Some(_), None) => "consider using `.get(n..)` or .get_mut(n..)` instead",
+ (Some(_), Some(_)) => "consider using `.get(n..m)` or `.get_mut(n..m)` instead",
+ (None, None) => return, // [..] is ok.
+ };
+
- span_lint_and_help(
- cx,
- INDEXING_SLICING,
- expr.span,
- "indexing may panic",
- None,
- "consider using `.get(n)` or `.get_mut(n)` instead",
- );
++ span_lint_and_then(cx, INDEXING_SLICING, expr.span, "slicing may panic", |diag| {
++ diag.help(help_msg);
++
++ if cx.tcx.hir().is_inside_const_context(expr.hir_id) {
++ diag.note(note);
++ }
++ });
+ } else {
+ // Catchall non-range index, i.e., [n] or [n << m]
+ if let ty::Array(..) = ty.kind() {
+ // Index is a const block.
+ if let ExprKind::ConstBlock(..) = index.kind {
+ return;
+ }
+ // Index is a constant uint.
+ if let Some(..) = constant(cx, cx.typeck_results(), index) {
+ // Let rustc's `const_err` lint handle constant `usize` indexing on arrays.
+ return;
+ }
+ }
+
++ span_lint_and_then(cx, INDEXING_SLICING, expr.span, "indexing may panic", |diag| {
++ diag.help("consider using `.get(n)` or `.get_mut(n)` instead");
++
++ if cx.tcx.hir().is_inside_const_context(expr.hir_id) {
++ diag.note(note);
++ }
++ });
+ }
+ }
+ }
+}
+
+/// Returns a tuple of options with the start and end (exclusive) values of
+/// the range. If the start or end is not constant, None is returned.
+fn to_const_range(cx: &LateContext<'_>, range: higher::Range<'_>, array_size: u128) -> (Option<u128>, Option<u128>) {
+ let s = range
+ .start
+ .map(|expr| constant(cx, cx.typeck_results(), expr).map(|(c, _)| c));
+ let start = match s {
+ Some(Some(Constant::Int(x))) => Some(x),
+ Some(_) => None,
+ None => Some(0),
+ };
+
+ let e = range
+ .end
+ .map(|expr| constant(cx, cx.typeck_results(), expr).map(|(c, _)| c));
+ let end = match e {
+ Some(Some(Constant::Int(x))) => {
+ if range.limits == RangeLimits::Closed {
+ Some(x + 1)
+ } else {
+ Some(x)
+ }
+ },
+ Some(_) => None,
+ None => Some(array_size),
+ };
+
+ (start, end)
+}
--- /dev/null
- use clippy_utils::{get_item_name, get_parent_as_impl, is_lint_allowed};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::snippet_with_applicability;
- ItemKind, Mutability, Node, TraitItemRef, TyKind,
++use clippy_utils::{get_item_name, get_parent_as_impl, is_lint_allowed, peel_ref_operators};
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefIdSet;
+use rustc_hir::{
+ def_id::DefId, AssocItemKind, BinOpKind, Expr, ExprKind, FnRetTy, ImplItem, ImplItemKind, ImplicitSelfKind, Item,
- format!(
- "{op}{}.is_empty()",
- snippet_with_applicability(cx, lit1.span, "_", &mut applicability)
- ),
++ ItemKind, Mutability, Node, TraitItemRef, TyKind, UnOp,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, AssocKind, FnSig, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{
+ source_map::{Span, Spanned, Symbol},
+ symbol::sym,
+};
++use std::borrow::Cow;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for getting the length of something via `.len()`
+ /// just to compare to zero, and suggests using `.is_empty()` where applicable.
+ ///
+ /// ### Why is this bad?
+ /// Some structures can answer `.is_empty()` much faster
+ /// than calculating their length. So it is good to get into the habit of using
+ /// `.is_empty()`, and having it is cheap.
+ /// Besides, it makes the intent clearer than a manual comparison in some contexts.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if x.len() == 0 {
+ /// ..
+ /// }
+ /// if y.len() != 0 {
+ /// ..
+ /// }
+ /// ```
+ /// instead use
+ /// ```ignore
+ /// if x.is_empty() {
+ /// ..
+ /// }
+ /// if !y.is_empty() {
+ /// ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LEN_ZERO,
+ style,
+ "checking `.len() == 0` or `.len() > 0` (or similar) when `.is_empty()` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for items that implement `.len()` but not
+ /// `.is_empty()`.
+ ///
+ /// ### Why is this bad?
+ /// It is good custom to have both methods, because for
+ /// some data structures, asking about the length will be a costly operation,
+ /// whereas `.is_empty()` can usually answer in constant time. Also it used to
+ /// lead to false positives on the [`len_zero`](#len_zero) lint – currently that
+ /// lint will ignore such entities.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// impl X {
+ /// pub fn len(&self) -> usize {
+ /// ..
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LEN_WITHOUT_IS_EMPTY,
+ style,
+ "traits or impls with a public `len` method but no corresponding `is_empty` method"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparing to an empty slice such as `""` or `[]`,
+ /// and suggests using `.is_empty()` where applicable.
+ ///
+ /// ### Why is this bad?
+ /// Some structures can answer `.is_empty()` much faster
+ /// than checking for equality. So it is good to get into the habit of using
+ /// `.is_empty()`, and having it is cheap.
+ /// Besides, it makes the intent clearer than a manual comparison in some contexts.
+ ///
+ /// ### Example
+ ///
+ /// ```ignore
+ /// if s == "" {
+ /// ..
+ /// }
+ ///
+ /// if arr == [] {
+ /// ..
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```ignore
+ /// if s.is_empty() {
+ /// ..
+ /// }
+ ///
+ /// if arr.is_empty() {
+ /// ..
+ /// }
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub COMPARISON_TO_EMPTY,
+ style,
+ "checking `x == \"\"` or `x == []` (or similar) when `.is_empty()` could be used instead"
+}
+
+declare_lint_pass!(LenZero => [LEN_ZERO, LEN_WITHOUT_IS_EMPTY, COMPARISON_TO_EMPTY]);
+
+impl<'tcx> LateLintPass<'tcx> for LenZero {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if item.span.from_expansion() {
+ return;
+ }
+
+ if let ItemKind::Trait(_, _, _, _, trait_items) = item.kind {
+ check_trait_items(cx, item, trait_items);
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
+ if_chain! {
+ if item.ident.name == sym::len;
+ if let ImplItemKind::Fn(sig, _) = &item.kind;
+ if sig.decl.implicit_self.has_implicit_self();
+ if cx.effective_visibilities.is_exported(item.owner_id.def_id);
+ if matches!(sig.decl.output, FnRetTy::Return(_));
+ if let Some(imp) = get_parent_as_impl(cx.tcx, item.hir_id());
+ if imp.of_trait.is_none();
+ if let TyKind::Path(ty_path) = &imp.self_ty.kind;
+ if let Some(ty_id) = cx.qpath_res(ty_path, imp.self_ty.hir_id).opt_def_id();
+ if let Some(local_id) = ty_id.as_local();
+ let ty_hir_id = cx.tcx.hir().local_def_id_to_hir_id(local_id);
+ if !is_lint_allowed(cx, LEN_WITHOUT_IS_EMPTY, ty_hir_id);
+ if let Some(output) = parse_len_output(cx, cx.tcx.fn_sig(item.owner_id).skip_binder());
+ then {
+ let (name, kind) = match cx.tcx.hir().find(ty_hir_id) {
+ Some(Node::ForeignItem(x)) => (x.ident.name, "extern type"),
+ Some(Node::Item(x)) => match x.kind {
+ ItemKind::Struct(..) => (x.ident.name, "struct"),
+ ItemKind::Enum(..) => (x.ident.name, "enum"),
+ ItemKind::Union(..) => (x.ident.name, "union"),
+ _ => (x.ident.name, "type"),
+ }
+ _ => return,
+ };
+ check_for_is_empty(cx, sig.span, sig.decl.implicit_self, output, ty_id, name, kind)
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ if let ExprKind::Binary(Spanned { node: cmp, .. }, left, right) = expr.kind {
+ match cmp {
+ BinOpKind::Eq => {
+ check_cmp(cx, expr.span, left, right, "", 0); // len == 0
+ check_cmp(cx, expr.span, right, left, "", 0); // 0 == len
+ },
+ BinOpKind::Ne => {
+ check_cmp(cx, expr.span, left, right, "!", 0); // len != 0
+ check_cmp(cx, expr.span, right, left, "!", 0); // 0 != len
+ },
+ BinOpKind::Gt => {
+ check_cmp(cx, expr.span, left, right, "!", 0); // len > 0
+ check_cmp(cx, expr.span, right, left, "", 1); // 1 > len
+ },
+ BinOpKind::Lt => {
+ check_cmp(cx, expr.span, left, right, "", 1); // len < 1
+ check_cmp(cx, expr.span, right, left, "!", 0); // 0 < len
+ },
+ BinOpKind::Ge => check_cmp(cx, expr.span, left, right, "!", 1), // len >= 1
+ BinOpKind::Le => check_cmp(cx, expr.span, right, left, "!", 1), // 1 <= len
+ _ => (),
+ }
+ }
+ }
+}
+
+fn check_trait_items(cx: &LateContext<'_>, visited_trait: &Item<'_>, trait_items: &[TraitItemRef]) {
+ fn is_named_self(cx: &LateContext<'_>, item: &TraitItemRef, name: Symbol) -> bool {
+ item.ident.name == name
+ && if let AssocItemKind::Fn { has_self } = item.kind {
+ has_self && { cx.tcx.fn_sig(item.id.owner_id).inputs().skip_binder().len() == 1 }
+ } else {
+ false
+ }
+ }
+
+ // fill the set with current and super traits
+ fn fill_trait_set(traitt: DefId, set: &mut DefIdSet, cx: &LateContext<'_>) {
+ if set.insert(traitt) {
+ for supertrait in rustc_trait_selection::traits::supertrait_def_ids(cx.tcx, traitt) {
+ fill_trait_set(supertrait, set, cx);
+ }
+ }
+ }
+
+ if cx.effective_visibilities.is_exported(visited_trait.owner_id.def_id)
+ && trait_items.iter().any(|i| is_named_self(cx, i, sym::len))
+ {
+ let mut current_and_super_traits = DefIdSet::default();
+ fill_trait_set(visited_trait.owner_id.to_def_id(), &mut current_and_super_traits, cx);
+ let is_empty = sym!(is_empty);
+
+ let is_empty_method_found = current_and_super_traits
+ .iter()
+ .flat_map(|&i| cx.tcx.associated_items(i).filter_by_name_unhygienic(is_empty))
+ .any(|i| {
+ i.kind == ty::AssocKind::Fn
+ && i.fn_has_self_parameter
+ && cx.tcx.fn_sig(i.def_id).inputs().skip_binder().len() == 1
+ });
+
+ if !is_empty_method_found {
+ span_lint(
+ cx,
+ LEN_WITHOUT_IS_EMPTY,
+ visited_trait.span,
+ &format!(
+ "trait `{}` has a `len` method but no (possibly inherited) `is_empty` method",
+ visited_trait.ident.name
+ ),
+ );
+ }
+ }
+}
+
+#[derive(Debug, Clone, Copy)]
+enum LenOutput<'tcx> {
+ Integral,
+ Option(DefId),
+ Result(DefId, Ty<'tcx>),
+}
+fn parse_len_output<'tcx>(cx: &LateContext<'_>, sig: FnSig<'tcx>) -> Option<LenOutput<'tcx>> {
+ match *sig.output().kind() {
+ ty::Int(_) | ty::Uint(_) => Some(LenOutput::Integral),
+ ty::Adt(adt, subs) if cx.tcx.is_diagnostic_item(sym::Option, adt.did()) => {
+ subs.type_at(0).is_integral().then(|| LenOutput::Option(adt.did()))
+ },
+ ty::Adt(adt, subs) if cx.tcx.is_diagnostic_item(sym::Result, adt.did()) => subs
+ .type_at(0)
+ .is_integral()
+ .then(|| LenOutput::Result(adt.did(), subs.type_at(1))),
+ _ => None,
+ }
+}
+
+impl<'tcx> LenOutput<'tcx> {
+ fn matches_is_empty_output(self, ty: Ty<'tcx>) -> bool {
+ match (self, ty.kind()) {
+ (_, &ty::Bool) => true,
+ (Self::Option(id), &ty::Adt(adt, subs)) if id == adt.did() => subs.type_at(0).is_bool(),
+ (Self::Result(id, err_ty), &ty::Adt(adt, subs)) if id == adt.did() => {
+ subs.type_at(0).is_bool() && subs.type_at(1) == err_ty
+ },
+ _ => false,
+ }
+ }
+
+ fn expected_sig(self, self_kind: ImplicitSelfKind) -> String {
+ let self_ref = match self_kind {
+ ImplicitSelfKind::ImmRef => "&",
+ ImplicitSelfKind::MutRef => "&mut ",
+ _ => "",
+ };
+ match self {
+ Self::Integral => format!("expected signature: `({self_ref}self) -> bool`"),
+ Self::Option(_) => {
+ format!("expected signature: `({self_ref}self) -> bool` or `({self_ref}self) -> Option<bool>")
+ },
+ Self::Result(..) => {
+ format!("expected signature: `({self_ref}self) -> bool` or `({self_ref}self) -> Result<bool>")
+ },
+ }
+ }
+}
+
+/// Checks if the given signature matches the expectations for `is_empty`
+fn check_is_empty_sig<'tcx>(sig: FnSig<'tcx>, self_kind: ImplicitSelfKind, len_output: LenOutput<'tcx>) -> bool {
+ match &**sig.inputs_and_output {
+ [arg, res] if len_output.matches_is_empty_output(*res) => {
+ matches!(
+ (arg.kind(), self_kind),
+ (ty::Ref(_, _, Mutability::Not), ImplicitSelfKind::ImmRef)
+ | (ty::Ref(_, _, Mutability::Mut), ImplicitSelfKind::MutRef)
+ ) || (!arg.is_ref() && matches!(self_kind, ImplicitSelfKind::Imm | ImplicitSelfKind::Mut))
+ },
+ _ => false,
+ }
+}
+
+/// Checks if the given type has an `is_empty` method with the appropriate signature.
+fn check_for_is_empty<'tcx>(
+ cx: &LateContext<'tcx>,
+ span: Span,
+ self_kind: ImplicitSelfKind,
+ output: LenOutput<'tcx>,
+ impl_ty: DefId,
+ item_name: Symbol,
+ item_kind: &str,
+) {
+ let is_empty = Symbol::intern("is_empty");
+ let is_empty = cx
+ .tcx
+ .inherent_impls(impl_ty)
+ .iter()
+ .flat_map(|&id| cx.tcx.associated_items(id).filter_by_name_unhygienic(is_empty))
+ .find(|item| item.kind == AssocKind::Fn);
+
+ let (msg, is_empty_span, self_kind) = match is_empty {
+ None => (
+ format!(
+ "{item_kind} `{}` has a public `len` method, but no `is_empty` method",
+ item_name.as_str(),
+ ),
+ None,
+ None,
+ ),
+ Some(is_empty) if !cx.effective_visibilities.is_exported(is_empty.def_id.expect_local()) => (
+ format!(
+ "{item_kind} `{}` has a public `len` method, but a private `is_empty` method",
+ item_name.as_str(),
+ ),
+ Some(cx.tcx.def_span(is_empty.def_id)),
+ None,
+ ),
+ Some(is_empty)
+ if !(is_empty.fn_has_self_parameter
+ && check_is_empty_sig(cx.tcx.fn_sig(is_empty.def_id).skip_binder(), self_kind, output)) =>
+ {
+ (
+ format!(
+ "{item_kind} `{}` has a public `len` method, but the `is_empty` method has an unexpected signature",
+ item_name.as_str(),
+ ),
+ Some(cx.tcx.def_span(is_empty.def_id)),
+ Some(self_kind),
+ )
+ },
+ Some(_) => return,
+ };
+
+ span_lint_and_then(cx, LEN_WITHOUT_IS_EMPTY, span, &msg, |db| {
+ if let Some(span) = is_empty_span {
+ db.span_note(span, "`is_empty` defined here");
+ }
+ if let Some(self_kind) = self_kind {
+ db.note(&output.expected_sig(self_kind));
+ }
+ });
+}
+
+fn check_cmp(cx: &LateContext<'_>, span: Span, method: &Expr<'_>, lit: &Expr<'_>, op: &str, compare_to: u32) {
+ if let (&ExprKind::MethodCall(method_path, receiver, args, _), ExprKind::Lit(lit)) = (&method.kind, &lit.kind) {
+ // check if we are in an is_empty() method
+ if let Some(name) = get_item_name(cx, method) {
+ if name.as_str() == "is_empty" {
+ return;
+ }
+ }
+
+ check_len(
+ cx,
+ span,
+ method_path.ident.name,
+ receiver,
+ args,
+ &lit.node,
+ op,
+ compare_to,
+ );
+ } else {
+ check_empty_expr(cx, span, method, lit, op);
+ }
+}
+
+// FIXME(flip1995): Figure out how to reduce the number of arguments
+#[allow(clippy::too_many_arguments)]
+fn check_len(
+ cx: &LateContext<'_>,
+ span: Span,
+ method_name: Symbol,
+ receiver: &Expr<'_>,
+ args: &[Expr<'_>],
+ lit: &LitKind,
+ op: &str,
+ compare_to: u32,
+) {
+ if let LitKind::Int(lit, _) = *lit {
+ // check if length is compared to the specified number
+ if lit != u128::from(compare_to) {
+ return;
+ }
+
+ if method_name == sym::len && args.is_empty() && has_is_empty(cx, receiver) {
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ LEN_ZERO,
+ span,
+ &format!("length comparison to {}", if compare_to == 0 { "zero" } else { "one" }),
+ &format!("using `{op}is_empty` is clearer and more explicit"),
+ format!(
+ "{op}{}.is_empty()",
+ snippet_with_applicability(cx, receiver.span, "_", &mut applicability)
+ ),
+ applicability,
+ );
+ }
+ }
+}
+
+fn check_empty_expr(cx: &LateContext<'_>, span: Span, lit1: &Expr<'_>, lit2: &Expr<'_>, op: &str) {
+ if (is_empty_array(lit2) || is_empty_string(lit2)) && has_is_empty(cx, lit1) {
+ let mut applicability = Applicability::MachineApplicable;
++
++ let lit1 = peel_ref_operators(cx, lit1);
++ let mut lit_str = snippet_with_applicability(cx, lit1.span, "_", &mut applicability);
++
++ // Wrap the expression in parentheses if it's a deref expression. Otherwise operator precedence will
++ // cause the code to dereference boolean(won't compile).
++ if let ExprKind::Unary(UnOp::Deref, _) = lit1.kind {
++ lit_str = Cow::from(format!("({lit_str})"));
++ }
++
+ span_lint_and_sugg(
+ cx,
+ COMPARISON_TO_EMPTY,
+ span,
+ "comparison to empty slice",
+ &format!("using `{op}is_empty` is clearer and more explicit"),
++ format!("{op}{lit_str}.is_empty()"),
+ applicability,
+ );
+ }
+}
+
+fn is_empty_string(expr: &Expr<'_>) -> bool {
+ if let ExprKind::Lit(ref lit) = expr.kind {
+ if let LitKind::Str(lit, _) = lit.node {
+ let lit = lit.as_str();
+ return lit.is_empty();
+ }
+ }
+ false
+}
+
+fn is_empty_array(expr: &Expr<'_>) -> bool {
+ if let ExprKind::Array(arr) = expr.kind {
+ return arr.is_empty();
+ }
+ false
+}
+
+/// Checks if this type has an `is_empty` method.
+fn has_is_empty(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ /// Gets an `AssocItem` and return true if it matches `is_empty(self)`.
+ fn is_is_empty(cx: &LateContext<'_>, item: &ty::AssocItem) -> bool {
+ if item.kind == ty::AssocKind::Fn {
+ let sig = cx.tcx.fn_sig(item.def_id);
+ let ty = sig.skip_binder();
+ ty.inputs().len() == 1
+ } else {
+ false
+ }
+ }
+
+ /// Checks the inherent impl's items for an `is_empty(self)` method.
+ fn has_is_empty_impl(cx: &LateContext<'_>, id: DefId) -> bool {
+ let is_empty = sym!(is_empty);
+ cx.tcx.inherent_impls(id).iter().any(|imp| {
+ cx.tcx
+ .associated_items(*imp)
+ .filter_by_name_unhygienic(is_empty)
+ .any(|item| is_is_empty(cx, item))
+ })
+ }
+
+ let ty = &cx.typeck_results().expr_ty(expr).peel_refs();
+ match ty.kind() {
+ ty::Dynamic(tt, ..) => tt.principal().map_or(false, |principal| {
+ let is_empty = sym!(is_empty);
+ cx.tcx
+ .associated_items(principal.def_id())
+ .filter_by_name_unhygienic(is_empty)
+ .any(|item| is_is_empty(cx, item))
+ }),
+ ty::Alias(ty::Projection, ref proj) => has_is_empty_impl(cx, proj.def_id),
+ ty::Adt(id, _) => has_is_empty_impl(cx, id.did()),
+ ty::Array(..) | ty::Slice(..) | ty::Str => true,
+ _ => false,
+ }
+}
--- /dev/null
- mod almost_complete_letter_range;
+#![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_data_structures;
+extern crate rustc_driver;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_analysis;
+extern crate rustc_hir_pretty;
+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_parse;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+
+#[macro_use]
+extern crate clippy_utils;
+#[macro_use]
+extern crate declare_clippy_lint;
+
+use std::io;
+use std::path::PathBuf;
+
+use clippy_utils::msrvs::Msrv;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_lint::{Lint, LintId};
+use rustc_session::Session;
+
+#[cfg(feature = "internal")]
+pub mod deprecated_lints;
+#[cfg_attr(feature = "internal", allow(clippy::missing_clippy_version_attribute))]
+mod utils;
+
+mod declared_lints;
+mod renamed_lints;
+
+// begin lints modules, do not remove this comment, it’s used in `update_lints`
- arithmetic_side_effects_allowed.clone(),
++mod almost_complete_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_raw_with_void_ptr;
+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 instant_subtraction;
+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_is_ascii_check;
+mod manual_let_else;
+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_block;
+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 suspicious_xor_used_as_pow;
+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`
+
+use crate::utils::conf::{format_error, TryConf};
+pub use crate::utils::conf::{lookup_conf_file, Conf};
+
+/// 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 = Msrv::read(&conf.msrv, sess);
+ let msrv = move || msrv.clone();
+
+ store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv: msrv() }));
+}
+
+#[doc(hidden)]
+pub fn read_conf(sess: &Session, path: &io::Result<Option<PathBuf>>) -> Conf {
+ let file_name = match path {
+ 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.err(format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ format_error(error)
+ ));
+ }
+
+ for warning in warnings {
+ sess.struct_warn(format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ format_error(warning)
+ ))
+ .emit();
+ }
+
+ conf
+}
+
+#[derive(Default)]
+struct RegistrationGroups {
+ all: Vec<LintId>,
+ cargo: Vec<LintId>,
+ complexity: Vec<LintId>,
+ correctness: Vec<LintId>,
+ nursery: Vec<LintId>,
+ pedantic: Vec<LintId>,
+ perf: Vec<LintId>,
+ restriction: Vec<LintId>,
+ style: Vec<LintId>,
+ suspicious: Vec<LintId>,
+ #[cfg(feature = "internal")]
+ internal: Vec<LintId>,
+}
+
+impl RegistrationGroups {
+ #[rustfmt::skip]
+ fn register(self, store: &mut rustc_lint::LintStore) {
+ store.register_group(true, "clippy::all", Some("clippy_all"), self.all);
+ store.register_group(true, "clippy::cargo", Some("clippy_cargo"), self.cargo);
+ store.register_group(true, "clippy::complexity", Some("clippy_complexity"), self.complexity);
+ store.register_group(true, "clippy::correctness", Some("clippy_correctness"), self.correctness);
+ store.register_group(true, "clippy::nursery", Some("clippy_nursery"), self.nursery);
+ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), self.pedantic);
+ store.register_group(true, "clippy::perf", Some("clippy_perf"), self.perf);
+ store.register_group(true, "clippy::restriction", Some("clippy_restriction"), self.restriction);
+ store.register_group(true, "clippy::style", Some("clippy_style"), self.style);
+ store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), self.suspicious);
+ #[cfg(feature = "internal")]
+ store.register_group(true, "clippy::internal", Some("clippy_internal"), self.internal);
+ }
+}
+
+#[derive(Copy, Clone)]
+pub(crate) enum LintCategory {
+ Cargo,
+ Complexity,
+ Correctness,
+ Nursery,
+ Pedantic,
+ Perf,
+ Restriction,
+ Style,
+ Suspicious,
+ #[cfg(feature = "internal")]
+ Internal,
+}
+#[allow(clippy::enum_glob_use)]
+use LintCategory::*;
+
+impl LintCategory {
+ fn is_all(self) -> bool {
+ matches!(self, Correctness | Suspicious | Style | Complexity | Perf)
+ }
+
+ fn group(self, groups: &mut RegistrationGroups) -> &mut Vec<LintId> {
+ match self {
+ Cargo => &mut groups.cargo,
+ Complexity => &mut groups.complexity,
+ Correctness => &mut groups.correctness,
+ Nursery => &mut groups.nursery,
+ Pedantic => &mut groups.pedantic,
+ Perf => &mut groups.perf,
+ Restriction => &mut groups.restriction,
+ Style => &mut groups.style,
+ Suspicious => &mut groups.suspicious,
+ #[cfg(feature = "internal")]
+ Internal => &mut groups.internal,
+ }
+ }
+}
+
+pub(crate) struct LintInfo {
+ /// Double reference to maintain pointer equality
+ lint: &'static &'static Lint,
+ category: LintCategory,
+ explanation: &'static str,
+}
+
+pub fn explain(name: &str) {
+ let target = format!("clippy::{}", name.to_ascii_uppercase());
+ match declared_lints::LINTS.iter().find(|info| info.lint.name == target) {
+ Some(info) => print!("{}", info.explanation),
+ None => println!("unknown lint: {name}"),
+ }
+}
+
+fn register_categories(store: &mut rustc_lint::LintStore) {
+ let mut groups = RegistrationGroups::default();
+
+ for LintInfo { lint, category, .. } in declared_lints::LINTS {
+ if category.is_all() {
+ groups.all.push(LintId::of(lint));
+ }
+
+ category.group(&mut groups).push(LintId::of(lint));
+ }
+
+ let lints: Vec<&'static Lint> = declared_lints::LINTS.iter().map(|info| *info.lint).collect();
+
+ store.register_lints(&lints);
+ groups.register(store);
+}
+
+/// 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);
+ register_categories(store);
+
+ include!("lib.deprecated.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();
++ let arithmetic_side_effects_allowed_binary = conf.arithmetic_side_effects_allowed_binary.clone();
++ let arithmetic_side_effects_allowed_unary = conf.arithmetic_side_effects_allowed_unary.clone();
+ store.register_late_pass(move |_| {
+ Box::new(operators::arithmetic_side_effects::ArithmeticSideEffects::new(
- store.register_late_pass(|_| Box::new(misc::MiscLints));
++ arithmetic_side_effects_allowed
++ .iter()
++ .flat_map(|el| [[el.clone(), "*".to_string()], ["*".to_string(), el.clone()]])
++ .chain(arithmetic_side_effects_allowed_binary.clone())
++ .collect(),
++ arithmetic_side_effects_allowed
++ .iter()
++ .chain(arithmetic_side_effects_allowed_unary.iter())
++ .cloned()
++ .collect(),
+ ))
+ });
+ 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(indexing_slicing::IndexingSlicing));
++ store.register_late_pass(|_| Box::<misc::LintPass>::default());
+ 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 = Msrv::read(&conf.msrv, sess);
+ let msrv = move || msrv.clone();
+ 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;
++ let suppress_restriction_lint_in_const = conf.suppress_restriction_lint_in_const;
+ 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())));
+ let matches_for_let_else = conf.matches_for_let_else;
+ store.register_late_pass(move |_| Box::new(manual_let_else::ManualLetElse::new(msrv(), matches_for_let_else)));
+ 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_early_pass(move || Box::new(almost_complete_letter_range::AlmostCompleteLetterRange::new(msrv())));
++ store.register_late_pass(move |_| {
++ Box::new(indexing_slicing::IndexingSlicing::new(
++ suppress_restriction_lint_in_const,
++ ))
++ });
+ 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));
+ let ignore_interior_mutability = conf.ignore_interior_mutability.clone();
+ store.register_late_pass(move |_| Box::new(mut_key::MutableKeyType::new(ignore_interior_mutability.clone())));
+ 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::<single_component_path_imports::SingleComponentPathImports>::default());
+ let max_fn_params_bools = conf.max_fn_params_bools;
+ let max_struct_bools = conf.max_struct_bools;
+ store.register_late_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));
+ let allow_mixed_uninlined = conf.allow_mixed_uninlined_format_args;
+ store.register_late_pass(move |_| Box::new(format_args::FormatArgs::new(msrv(), allow_mixed_uninlined)));
+ 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 allow_print_in_tests = conf.allow_print_in_tests;
+ store.register_late_pass(move |_| Box::new(write::Write::new(allow_print_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_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_range::AlmostCompleteRange::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(move |_| Box::new(instant_subtraction::InstantSubtraction::new(msrv())));
+ 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));
+ store.register_late_pass(|_| Box::new(from_raw_with_void_ptr::FromRawWithVoidPtr));
+ store.register_late_pass(|_| Box::new(suspicious_xor_used_as_pow::ConfusingXorAndPow));
+ store.register_late_pass(move |_| Box::new(manual_is_ascii_check::ManualIsAsciiCheck::new(msrv())));
++ store.register_late_pass(|_| Box::new(semicolon_block::SemicolonBlock));
+ // 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
- done: bool,
+use clippy_utils::ty::{has_iter_method, implements_trait};
+use clippy_utils::{get_parent_expr, is_integer_const, path_to_local, path_to_local_id, sugg};
+use if_chain::if_chain;
+use rustc_ast::ast::{LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_expr, walk_local, walk_pat, walk_stmt, Visitor};
+use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, HirId, HirIdMap, Local, Mutability, Pat, PatKind, Stmt};
+use rustc_hir_analysis::hir_ty_to_ty;
+use rustc_lint::LateContext;
+use rustc_middle::hir::nested_filter;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::source_map::Spanned;
+use rustc_span::symbol::{sym, Symbol};
+use std::iter::Iterator;
+
+#[derive(Debug, PartialEq, Eq)]
+enum IncrementVisitorVarState {
+ Initial, // Not examined yet
+ IncrOnce, // Incremented exactly once, may be a loop counter
+ DontWarn,
+}
+
+/// Scan a for loop for variables that are incremented exactly once and not used after that.
+pub(super) struct IncrementVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>, // context reference
+ states: HirIdMap<IncrementVisitorVarState>, // incremented variables
+ depth: u32, // depth of conditional expressions
- done: false,
+}
+
+impl<'a, 'tcx> IncrementVisitor<'a, 'tcx> {
+ pub(super) fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
+ states: HirIdMap::default(),
+ depth: 0,
- if self.done {
- return;
- }
-
+ }
+ }
+
+ pub(super) fn into_results(self) -> impl Iterator<Item = HirId> {
+ self.states.into_iter().filter_map(|(id, state)| {
+ if state == IncrementVisitorVarState::IncrOnce {
+ Some(id)
+ } else {
+ None
+ }
+ })
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for IncrementVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
- self.done = true;
+ // If node is a variable
+ if let Some(def_id) = path_to_local(expr) {
+ if let Some(parent) = get_parent_expr(self.cx, expr) {
+ let state = self.states.entry(def_id).or_insert(IncrementVisitorVarState::Initial);
+ if *state == IncrementVisitorVarState::IncrOnce {
+ *state = IncrementVisitorVarState::DontWarn;
+ return;
+ }
+
+ match parent.kind {
+ ExprKind::AssignOp(op, lhs, rhs) => {
+ if lhs.hir_id == expr.hir_id {
+ *state = if op.node == BinOpKind::Add
+ && is_integer_const(self.cx, rhs, 1)
+ && *state == IncrementVisitorVarState::Initial
+ && self.depth == 0
+ {
+ IncrementVisitorVarState::IncrOnce
+ } else {
+ // Assigned some other value or assigned multiple times
+ IncrementVisitorVarState::DontWarn
+ };
+ }
+ },
+ ExprKind::Assign(lhs, _, _) if lhs.hir_id == expr.hir_id => {
+ *state = IncrementVisitorVarState::DontWarn;
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutability, _) if mutability == Mutability::Mut => {
+ *state = IncrementVisitorVarState::DontWarn;
+ },
+ _ => (),
+ }
+ }
+
+ walk_expr(self, expr);
+ } else if is_loop(expr) || is_conditional(expr) {
+ self.depth += 1;
+ walk_expr(self, expr);
+ self.depth -= 1;
+ } else if let ExprKind::Continue(_) = expr.kind {
++ // If we see a `continue` block, then we increment depth so that the IncrementVisitor
++ // state will be set to DontWarn if we see the variable being modified anywhere afterwards.
++ self.depth += 1;
+ } else {
+ walk_expr(self, expr);
+ }
+ }
+}
+
+enum InitializeVisitorState<'hir> {
+ Initial, // Not examined yet
+ Declared(Symbol, Option<Ty<'hir>>), // Declared but not (yet) initialized
+ Initialized {
+ name: Symbol,
+ ty: Option<Ty<'hir>>,
+ initializer: &'hir Expr<'hir>,
+ },
+ DontWarn,
+}
+
+/// Checks whether a variable is initialized at the start of a loop and not modified
+/// and used after the loop.
+pub(super) struct InitializeVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>, // context reference
+ end_expr: &'tcx Expr<'tcx>, // the for loop. Stop scanning here.
+ var_id: HirId,
+ state: InitializeVisitorState<'tcx>,
+ depth: u32, // depth of conditional expressions
+ past_loop: bool,
+}
+
+impl<'a, 'tcx> InitializeVisitor<'a, 'tcx> {
+ pub(super) fn new(cx: &'a LateContext<'tcx>, end_expr: &'tcx Expr<'tcx>, var_id: HirId) -> Self {
+ Self {
+ cx,
+ end_expr,
+ var_id,
+ state: InitializeVisitorState::Initial,
+ depth: 0,
+ past_loop: false,
+ }
+ }
+
+ pub(super) fn get_result(&self) -> Option<(Symbol, Option<Ty<'tcx>>, &'tcx Expr<'tcx>)> {
+ if let InitializeVisitorState::Initialized { name, ty, initializer } = self.state {
+ Some((name, ty, initializer))
+ } else {
+ None
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for InitializeVisitor<'a, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+
+ fn visit_local(&mut self, l: &'tcx Local<'_>) {
+ // Look for declarations of the variable
+ if_chain! {
+ if l.pat.hir_id == self.var_id;
+ if let PatKind::Binding(.., ident, _) = l.pat.kind;
+ then {
+ let ty = l.ty.map(|ty| hir_ty_to_ty(self.cx.tcx, ty));
+
+ self.state = l.init.map_or(InitializeVisitorState::Declared(ident.name, ty), |init| {
+ InitializeVisitorState::Initialized {
+ initializer: init,
+ ty,
+ name: ident.name,
+ }
+ })
+ }
+ }
+
+ walk_local(self, l);
+ }
+
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if matches!(self.state, InitializeVisitorState::DontWarn) {
+ return;
+ }
+ if expr.hir_id == self.end_expr.hir_id {
+ self.past_loop = true;
+ return;
+ }
+ // No need to visit expressions before the variable is
+ // declared
+ if matches!(self.state, InitializeVisitorState::Initial) {
+ return;
+ }
+
+ // If node is the desired variable, see how it's used
+ if path_to_local_id(expr, self.var_id) {
+ if self.past_loop {
+ self.state = InitializeVisitorState::DontWarn;
+ return;
+ }
+
+ if let Some(parent) = get_parent_expr(self.cx, expr) {
+ match parent.kind {
+ ExprKind::AssignOp(_, lhs, _) if lhs.hir_id == expr.hir_id => {
+ self.state = InitializeVisitorState::DontWarn;
+ },
+ ExprKind::Assign(lhs, rhs, _) if lhs.hir_id == expr.hir_id => {
+ self.state = if self.depth == 0 {
+ match self.state {
+ InitializeVisitorState::Declared(name, mut ty) => {
+ if ty.is_none() {
+ if let ExprKind::Lit(Spanned {
+ node: LitKind::Int(_, LitIntType::Unsuffixed),
+ ..
+ }) = rhs.kind
+ {
+ ty = None;
+ } else {
+ ty = self.cx.typeck_results().expr_ty_opt(rhs);
+ }
+ }
+
+ InitializeVisitorState::Initialized {
+ initializer: rhs,
+ ty,
+ name,
+ }
+ },
+ InitializeVisitorState::Initialized { ty, name, .. } => {
+ InitializeVisitorState::Initialized {
+ initializer: rhs,
+ ty,
+ name,
+ }
+ },
+ _ => InitializeVisitorState::DontWarn,
+ }
+ } else {
+ InitializeVisitorState::DontWarn
+ }
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutability, _) if mutability == Mutability::Mut => {
+ self.state = InitializeVisitorState::DontWarn;
+ },
+ _ => (),
+ }
+ }
+
+ walk_expr(self, expr);
+ } else if !self.past_loop && is_loop(expr) {
+ self.state = InitializeVisitorState::DontWarn;
+ } else if is_conditional(expr) {
+ self.depth += 1;
+ walk_expr(self, expr);
+ self.depth -= 1;
+ } else {
+ walk_expr(self, expr);
+ }
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
+
+fn is_loop(expr: &Expr<'_>) -> bool {
+ matches!(expr.kind, ExprKind::Loop(..))
+}
+
+fn is_conditional(expr: &Expr<'_>) -> bool {
+ matches!(expr.kind, ExprKind::If(..) | ExprKind::Match(..))
+}
+
+#[derive(PartialEq, Eq)]
+pub(super) enum Nesting {
+ Unknown, // no nesting detected yet
+ RuledOut, // the iterator is initialized or assigned within scope
+ LookFurther, // no nesting detected, no further walk required
+}
+
+use self::Nesting::{LookFurther, RuledOut, Unknown};
+
+pub(super) struct LoopNestVisitor {
+ pub(super) hir_id: HirId,
+ pub(super) iterator: HirId,
+ pub(super) nesting: Nesting,
+}
+
+impl<'tcx> Visitor<'tcx> for LoopNestVisitor {
+ fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
+ if stmt.hir_id == self.hir_id {
+ self.nesting = LookFurther;
+ } else if self.nesting == Unknown {
+ walk_stmt(self, stmt);
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if self.nesting != Unknown {
+ return;
+ }
+ if expr.hir_id == self.hir_id {
+ self.nesting = LookFurther;
+ return;
+ }
+ match expr.kind {
+ ExprKind::Assign(path, _, _) | ExprKind::AssignOp(_, path, _) => {
+ if path_to_local_id(path, self.iterator) {
+ self.nesting = RuledOut;
+ }
+ },
+ _ => walk_expr(self, expr),
+ }
+ }
+
+ fn visit_pat(&mut self, pat: &'tcx Pat<'_>) {
+ if self.nesting != Unknown {
+ return;
+ }
+ if let PatKind::Binding(_, id, ..) = pat.kind {
+ if id == self.iterator {
+ self.nesting = RuledOut;
+ return;
+ }
+ }
+ walk_pat(self, pat);
+ }
+}
+
+/// If `arg` was the argument to a `for` loop, return the "cleanest" way of writing the
+/// actual `Iterator` that the loop uses.
+pub(super) fn make_iterator_snippet(cx: &LateContext<'_>, arg: &Expr<'_>, applic_ref: &mut Applicability) -> String {
+ let impls_iterator = cx.tcx.get_diagnostic_item(sym::Iterator).map_or(false, |id| {
+ implements_trait(cx, cx.typeck_results().expr_ty(arg), id, &[])
+ });
+ if impls_iterator {
+ format!(
+ "{}",
+ sugg::Sugg::hir_with_applicability(cx, arg, "_", applic_ref).maybe_par()
+ )
+ } else {
+ // (&x).into_iter() ==> x.iter()
+ // (&mut x).into_iter() ==> x.iter_mut()
+ let arg_ty = cx.typeck_results().expr_ty_adjusted(arg);
+ match &arg_ty.kind() {
+ ty::Ref(_, inner_ty, mutbl) if has_iter_method(cx, *inner_ty).is_some() => {
+ let method_name = match mutbl {
+ Mutability::Mut => "iter_mut",
+ Mutability::Not => "iter",
+ };
+ let caller = match &arg.kind {
+ ExprKind::AddrOf(BorrowKind::Ref, _, arg_inner) => arg_inner,
+ _ => arg,
+ };
+ format!(
+ "{}.{method_name}()",
+ sugg::Sugg::hir_with_applicability(cx, caller, "_", applic_ref).maybe_par(),
+ )
+ },
+ _ => format!(
+ "{}.into_iter()",
+ sugg::Sugg::hir_with_applicability(cx, arg, "_", applic_ref).maybe_par()
+ ),
+ }
+ }
+}
--- /dev/null
- use clippy_utils::{peel_blocks_with_stmt, span_extract_comment, sugg};
+use crate::rustc_lint::LintContext;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::macros::{root_macro_call, FormatArgsExpn};
+use clippy_utils::source::snippet_with_applicability;
++use clippy_utils::{is_else_clause, peel_blocks_with_stmt, span_extract_comment, sugg};
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects `if`-then-`panic!` that can be replaced with `assert!`.
+ ///
+ /// ### Why is this bad?
+ /// `assert!` is simpler than `if`-then-`panic!`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let sad_people: Vec<&str> = vec![];
+ /// if !sad_people.is_empty() {
+ /// panic!("there are sad people: {:?}", sad_people);
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let sad_people: Vec<&str> = vec![];
+ /// assert!(sad_people.is_empty(), "there are sad people: {:?}", sad_people);
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub MANUAL_ASSERT,
+ pedantic,
+ "`panic!` and only a `panic!` in `if`-then statement"
+}
+
+declare_lint_pass!(ManualAssert => [MANUAL_ASSERT]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualAssert {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
+ if_chain! {
+ if let ExprKind::If(cond, then, None) = expr.kind;
+ if !matches!(cond.kind, ExprKind::Let(_));
+ if !expr.span.from_expansion();
+ let then = peel_blocks_with_stmt(then);
+ if let Some(macro_call) = root_macro_call(then.span);
+ if cx.tcx.item_name(macro_call.def_id) == sym::panic;
+ if !cx.tcx.sess.source_map().is_multiline(cond.span);
+ if let Some(format_args) = FormatArgsExpn::find_nested(cx, then, macro_call.expn);
++ // Don't change `else if foo { panic!(..) }` to `else { assert!(foo, ..) }` as it just
++ // shuffles the condition around.
++ // Should this have a config value?
++ if !is_else_clause(cx.tcx, expr);
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let format_args_snip = snippet_with_applicability(cx, format_args.inputs_span(), "..", &mut applicability);
+ let cond = cond.peel_drop_temps();
+ let mut comments = span_extract_comment(cx.sess().source_map(), expr.span);
+ if !comments.is_empty() {
+ comments += "\n";
+ }
+ let (cond, not) = match cond.kind {
+ ExprKind::Unary(UnOp::Not, e) => (e, ""),
+ _ => (cond, "!"),
+ };
+ let cond_sugg = sugg::Sugg::hir_with_applicability(cx, cond, "..", &mut applicability).maybe_par();
+ let sugg = format!("assert!({not}{cond_sugg}, {format_args_snip});");
+ // we show to the user the suggestion without the comments, but when applicating the fix, include the comments in the block
+ span_lint_and_then(
+ cx,
+ MANUAL_ASSERT,
+ expr.span,
+ "only a `panic!` in `if`-then statement",
+ |diag| {
+ // comments can be noisy, do not show them to the user
+ if !comments.is_empty() {
+ diag.tool_only_span_suggestion(
+ expr.span.shrink_to_lo(),
+ "add comments back",
+ comments,
+ applicability);
+ }
+ diag.span_suggestion(
+ expr.span,
+ "try instead",
+ sugg,
+ applicability);
+ }
+
+ );
+ }
+ }
+ }
+}
--- /dev/null
- use clippy_utils::{diagnostics::span_lint_and_sugg, in_constant, macros::root_macro_call, source::snippet};
+use clippy_utils::msrvs::{self, Msrv};
- use rustc_hir::{Expr, ExprKind, PatKind, RangeEnd};
++use clippy_utils::{diagnostics::span_lint_and_sugg, higher, in_constant, macros::root_macro_call, source::snippet};
++use rustc_ast::ast::RangeLimits;
+use rustc_ast::LitKind::{Byte, Char};
+use rustc_errors::Applicability;
- use rustc_span::{def_id::DefId, sym};
++use rustc_hir::{BorrowKind, Expr, ExprKind, PatKind, RangeEnd};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
- let Some(macro_call) = root_macro_call(expr.span) else { return };
-
- if is_matches_macro(cx, macro_call.def_id) {
++use rustc_span::{def_id::DefId, sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Suggests to use dedicated built-in methods,
+ /// `is_ascii_(lowercase|uppercase|digit)` for checking on corresponding ascii range
+ ///
+ /// ### Why is this bad?
+ /// Using the built-in functions is more readable and makes it
+ /// clear that it's not a specific subset of characters, but all
+ /// ASCII (lowercase|uppercase|digit) characters.
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// assert!(matches!('x', 'a'..='z'));
+ /// assert!(matches!(b'X', b'A'..=b'Z'));
+ /// assert!(matches!('2', '0'..='9'));
+ /// assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
++ ///
++ /// ('0'..='9').contains(&'0');
++ /// ('a'..='z').contains(&'a');
++ /// ('A'..='Z').contains(&'A');
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// assert!('x'.is_ascii_lowercase());
+ /// assert!(b'X'.is_ascii_uppercase());
+ /// assert!('2'.is_ascii_digit());
+ /// assert!('x'.is_ascii_alphabetic());
++ ///
++ /// '0'.is_ascii_digit();
++ /// 'a'.is_ascii_lowercase();
++ /// 'A'.is_ascii_uppercase();
+ /// }
+ /// ```
+ #[clippy::version = "1.66.0"]
+ pub MANUAL_IS_ASCII_CHECK,
+ style,
+ "use dedicated method to check ascii range"
+}
+impl_lint_pass!(ManualIsAsciiCheck => [MANUAL_IS_ASCII_CHECK]);
+
+pub struct ManualIsAsciiCheck {
+ msrv: Msrv,
+}
+
+impl ManualIsAsciiCheck {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> Self {
+ Self { msrv }
+ }
+}
+
+#[derive(Debug, PartialEq)]
+enum CharRange {
+ /// 'a'..='z' | b'a'..=b'z'
+ LowerChar,
+ /// 'A'..='Z' | b'A'..=b'Z'
+ UpperChar,
+ /// AsciiLower | AsciiUpper
+ FullChar,
+ /// '0..=9'
+ Digit,
+ Otherwise,
+}
+
+impl<'tcx> LateLintPass<'tcx> for ManualIsAsciiCheck {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if !self.msrv.meets(msrvs::IS_ASCII_DIGIT) {
+ return;
+ }
+
+ if in_constant(cx, expr.hir_id) && !self.msrv.meets(msrvs::IS_ASCII_DIGIT_CONST) {
+ return;
+ }
+
-
- if let Some(sugg) = match range {
- CharRange::UpperChar => Some("is_ascii_uppercase"),
- CharRange::LowerChar => Some("is_ascii_lowercase"),
- CharRange::FullChar => Some("is_ascii_alphabetic"),
- CharRange::Digit => Some("is_ascii_digit"),
- CharRange::Otherwise => None,
- } {
- let default_snip = "..";
- // `snippet_with_applicability` may set applicability to `MaybeIncorrect` for
- // macro span, so we check applicability manually by comparing `recv` is not default.
- let recv = snippet(cx, recv.span, default_snip);
-
- let applicability = if recv == default_snip {
- Applicability::HasPlaceholders
- } else {
- Applicability::MachineApplicable
- };
-
- span_lint_and_sugg(
- cx,
- MANUAL_IS_ASCII_CHECK,
- macro_call.span,
- "manual check for common ascii range",
- "try",
- format!("{recv}.{sugg}()"),
- applicability,
- );
- }
++ if let Some(macro_call) = root_macro_call(expr.span)
++ && is_matches_macro(cx, macro_call.def_id) {
+ if let ExprKind::Match(recv, [arm, ..], _) = expr.kind {
+ let range = check_pat(&arm.pat.kind);
++ check_is_ascii(cx, macro_call.span, recv, &range);
++ }
++ } else if let ExprKind::MethodCall(path, receiver, [arg], ..) = expr.kind
++ && path.ident.name == sym!(contains)
++ && let Some(higher::Range { start: Some(start), end: Some(end), limits: RangeLimits::Closed })
++ = higher::Range::hir(receiver) {
++ let range = check_range(start, end);
++ if let ExprKind::AddrOf(BorrowKind::Ref, _, e) = arg.kind {
++ check_is_ascii(cx, expr.span, e, &range);
++ } else {
++ check_is_ascii(cx, expr.span, arg, &range);
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
++fn check_is_ascii(cx: &LateContext<'_>, span: Span, recv: &Expr<'_>, range: &CharRange) {
++ if let Some(sugg) = match range {
++ CharRange::UpperChar => Some("is_ascii_uppercase"),
++ CharRange::LowerChar => Some("is_ascii_lowercase"),
++ CharRange::FullChar => Some("is_ascii_alphabetic"),
++ CharRange::Digit => Some("is_ascii_digit"),
++ CharRange::Otherwise => None,
++ } {
++ let default_snip = "..";
++ // `snippet_with_applicability` may set applicability to `MaybeIncorrect` for
++ // macro span, so we check applicability manually by comparing `recv` is not default.
++ let recv = snippet(cx, recv.span, default_snip);
++
++ let applicability = if recv == default_snip {
++ Applicability::HasPlaceholders
++ } else {
++ Applicability::MachineApplicable
++ };
++
++ span_lint_and_sugg(
++ cx,
++ MANUAL_IS_ASCII_CHECK,
++ span,
++ "manual check for common ascii range",
++ "try",
++ format!("{recv}.{sugg}()"),
++ applicability,
++ );
++ }
++}
++
+fn check_pat(pat_kind: &PatKind<'_>) -> CharRange {
+ match pat_kind {
+ PatKind::Or(pats) => {
+ let ranges = pats.iter().map(|p| check_pat(&p.kind)).collect::<Vec<_>>();
+
+ if ranges.len() == 2 && ranges.contains(&CharRange::UpperChar) && ranges.contains(&CharRange::LowerChar) {
+ CharRange::FullChar
+ } else {
+ CharRange::Otherwise
+ }
+ },
+ PatKind::Range(Some(start), Some(end), kind) if *kind == RangeEnd::Included => check_range(start, end),
+ _ => CharRange::Otherwise,
+ }
+}
+
+fn check_range(start: &Expr<'_>, end: &Expr<'_>) -> CharRange {
+ if let ExprKind::Lit(start_lit) = &start.kind
+ && let ExprKind::Lit(end_lit) = &end.kind {
+ match (&start_lit.node, &end_lit.node) {
+ (Char('a'), Char('z')) | (Byte(b'a'), Byte(b'z')) => CharRange::LowerChar,
+ (Char('A'), Char('Z')) | (Byte(b'A'), Byte(b'Z')) => CharRange::UpperChar,
+ (Char('0'), Char('9')) | (Byte(b'0'), Byte(b'9')) => CharRange::Digit,
+ _ => CharRange::Otherwise,
+ }
+ } else {
+ CharRange::Otherwise
+ }
+}
+
+fn is_matches_macro(cx: &LateContext<'_>, macro_def_id: DefId) -> bool {
+ if let Some(name) = cx.tcx.get_diagnostic_name(macro_def_id) {
+ return sym::matches_macro == name;
+ }
+
+ false
+}
--- /dev/null
- let sugg = format!("let {sn_pat} = {sn_expr} else {else_bl};");
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::higher::IfLetOrMatch;
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::peel_blocks;
+use clippy_utils::source::snippet_with_context;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::visitors::{for_each_expr, Descend};
+use if_chain::if_chain;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, MatchSource, Pat, PatKind, QPath, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::sym;
+use rustc_span::Span;
+use serde::Deserialize;
+use std::ops::ControlFlow;
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Warn of cases where `let...else` could be used
+ ///
+ /// ### Why is this bad?
+ ///
+ /// `let...else` provides a standard construct for this pattern
+ /// that people can easily recognize. It's also more compact.
+ ///
+ /// ### Example
+ ///
+ /// ```rust
+ /// # let w = Some(0);
+ /// let v = if let Some(v) = w { v } else { return };
+ /// ```
+ ///
+ /// Could be written:
+ ///
+ /// ```rust
+ /// # #![feature(let_else)]
+ /// # fn main () {
+ /// # let w = Some(0);
+ /// let Some(v) = w else { return };
+ /// # }
+ /// ```
+ #[clippy::version = "1.67.0"]
+ pub MANUAL_LET_ELSE,
+ pedantic,
+ "manual implementation of a let...else statement"
+}
+
+pub struct ManualLetElse {
+ msrv: Msrv,
+ matches_behaviour: MatchLintBehaviour,
+}
+
+impl ManualLetElse {
+ #[must_use]
+ pub fn new(msrv: Msrv, matches_behaviour: MatchLintBehaviour) -> Self {
+ Self {
+ msrv,
+ matches_behaviour,
+ }
+ }
+}
+
+impl_lint_pass!(ManualLetElse => [MANUAL_LET_ELSE]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualLetElse {
+ fn check_stmt(&mut self, cx: &LateContext<'_>, stmt: &'tcx Stmt<'tcx>) {
+ let if_let_or_match = if_chain! {
+ if self.msrv.meets(msrvs::LET_ELSE);
+ if !in_external_macro(cx.sess(), stmt.span);
+ if let StmtKind::Local(local) = stmt.kind;
+ if let Some(init) = local.init;
+ if local.els.is_none();
+ if local.ty.is_none();
+ if init.span.ctxt() == stmt.span.ctxt();
+ if let Some(if_let_or_match) = IfLetOrMatch::parse(cx, init);
+ then {
+ if_let_or_match
+ } else {
+ return;
+ }
+ };
+
+ match if_let_or_match {
+ IfLetOrMatch::IfLet(if_let_expr, let_pat, if_then, if_else) => if_chain! {
+ if expr_is_simple_identity(let_pat, if_then);
+ if let Some(if_else) = if_else;
+ if expr_diverges(cx, if_else);
+ then {
+ emit_manual_let_else(cx, stmt.span, if_let_expr, let_pat, if_else);
+ }
+ },
+ IfLetOrMatch::Match(match_expr, arms, source) => {
+ if self.matches_behaviour == MatchLintBehaviour::Never {
+ return;
+ }
+ if source != MatchSource::Normal {
+ return;
+ }
+ // Any other number than two arms doesn't (neccessarily)
+ // have a trivial mapping to let else.
+ if arms.len() != 2 {
+ return;
+ }
+ // Guards don't give us an easy mapping either
+ if arms.iter().any(|arm| arm.guard.is_some()) {
+ return;
+ }
+ let check_types = self.matches_behaviour == MatchLintBehaviour::WellKnownTypes;
+ let diverging_arm_opt = arms
+ .iter()
+ .enumerate()
+ .find(|(_, arm)| expr_diverges(cx, arm.body) && pat_allowed_for_else(cx, arm.pat, check_types));
+ let Some((idx, diverging_arm)) = diverging_arm_opt else { return; };
+ let pat_arm = &arms[1 - idx];
+ if !expr_is_simple_identity(pat_arm.pat, pat_arm.body) {
+ return;
+ }
+
+ emit_manual_let_else(cx, stmt.span, match_expr, pat_arm.pat, diverging_arm.body);
+ },
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+fn emit_manual_let_else(cx: &LateContext<'_>, span: Span, expr: &Expr<'_>, pat: &Pat<'_>, else_body: &Expr<'_>) {
+ span_lint_and_then(
+ cx,
+ MANUAL_LET_ELSE,
+ span,
+ "this could be rewritten as `let...else`",
+ |diag| {
+ // This is far from perfect, for example there needs to be:
+ // * mut additions for the bindings
+ // * renamings of the bindings
+ // * unused binding collision detection with existing ones
+ // * putting patterns with at the top level | inside ()
+ // for this to be machine applicable.
+ let mut app = Applicability::HasPlaceholders;
+ let (sn_pat, _) = snippet_with_context(cx, pat.span, span.ctxt(), "", &mut app);
+ let (sn_expr, _) = snippet_with_context(cx, expr.span, span.ctxt(), "", &mut app);
+ let (sn_else, _) = snippet_with_context(cx, else_body.span, span.ctxt(), "", &mut app);
+
+ let else_bl = if matches!(else_body.kind, ExprKind::Block(..)) {
+ sn_else.into_owned()
+ } else {
+ format!("{{ {sn_else} }}")
+ };
++ let sn_bl = if matches!(pat.kind, PatKind::Or(..)) {
++ format!("({sn_pat})")
++ } else {
++ sn_pat.into_owned()
++ };
++ let sugg = format!("let {sn_bl} = {sn_expr} else {else_bl};");
+ diag.span_suggestion(span, "consider writing", sugg, app);
+ },
+ );
+}
+
+fn expr_diverges(cx: &LateContext<'_>, expr: &'_ Expr<'_>) -> bool {
+ fn is_never(cx: &LateContext<'_>, expr: &'_ Expr<'_>) -> bool {
+ if let Some(ty) = cx.typeck_results().expr_ty_opt(expr) {
+ return ty.is_never();
+ }
+ false
+ }
+ // We can't just call is_never on expr and be done, because the type system
+ // sometimes coerces the ! type to something different before we can get
+ // our hands on it. So instead, we do a manual search. We do fall back to
+ // is_never in some places when there is no better alternative.
+ for_each_expr(expr, |ex| {
+ match ex.kind {
+ ExprKind::Continue(_) | ExprKind::Break(_, _) | ExprKind::Ret(_) => ControlFlow::Break(()),
+ ExprKind::Call(call, _) => {
+ if is_never(cx, ex) || is_never(cx, call) {
+ return ControlFlow::Break(());
+ }
+ ControlFlow::Continue(Descend::Yes)
+ },
+ ExprKind::MethodCall(..) => {
+ if is_never(cx, ex) {
+ return ControlFlow::Break(());
+ }
+ ControlFlow::Continue(Descend::Yes)
+ },
+ ExprKind::If(if_expr, if_then, if_else) => {
+ let else_diverges = if_else.map_or(false, |ex| expr_diverges(cx, ex));
+ let diverges = expr_diverges(cx, if_expr) || (else_diverges && expr_diverges(cx, if_then));
+ if diverges {
+ return ControlFlow::Break(());
+ }
+ ControlFlow::Continue(Descend::No)
+ },
+ ExprKind::Match(match_expr, match_arms, _) => {
+ let diverges = expr_diverges(cx, match_expr)
+ || match_arms.iter().all(|arm| {
+ let guard_diverges = arm.guard.as_ref().map_or(false, |g| expr_diverges(cx, g.body()));
+ guard_diverges || expr_diverges(cx, arm.body)
+ });
+ if diverges {
+ return ControlFlow::Break(());
+ }
+ ControlFlow::Continue(Descend::No)
+ },
+
+ // Don't continue into loops or labeled blocks, as they are breakable,
+ // and we'd have to start checking labels.
+ ExprKind::Block(_, Some(_)) | ExprKind::Loop(..) => ControlFlow::Continue(Descend::No),
+
+ // Default: descend
+ _ => ControlFlow::Continue(Descend::Yes),
+ }
+ })
+ .is_some()
+}
+
+fn pat_allowed_for_else(cx: &LateContext<'_>, pat: &'_ Pat<'_>, check_types: bool) -> bool {
+ // Check whether the pattern contains any bindings, as the
+ // binding might potentially be used in the body.
+ // TODO: only look for *used* bindings.
+ let mut has_bindings = false;
+ pat.each_binding_or_first(&mut |_, _, _, _| has_bindings = true);
+ if has_bindings {
+ return false;
+ }
+
+ // If we shouldn't check the types, exit early.
+ if !check_types {
+ return true;
+ }
+
+ // Check whether any possibly "unknown" patterns are included,
+ // because users might not know which values some enum has.
+ // Well-known enums are excepted, as we assume people know them.
+ // We do a deep check, to be able to disallow Err(En::Foo(_))
+ // for usage of the En::Foo variant, as we disallow En::Foo(_),
+ // but we allow Err(_).
+ let typeck_results = cx.typeck_results();
+ let mut has_disallowed = false;
+ pat.walk_always(|pat| {
+ // Only do the check if the type is "spelled out" in the pattern
+ if !matches!(
+ pat.kind,
+ PatKind::Struct(..) | PatKind::TupleStruct(..) | PatKind::Path(..)
+ ) {
+ return;
+ };
+ let ty = typeck_results.pat_ty(pat);
+ // Option and Result are allowed, everything else isn't.
+ if !(is_type_diagnostic_item(cx, ty, sym::Option) || is_type_diagnostic_item(cx, ty, sym::Result)) {
+ has_disallowed = true;
+ }
+ });
+ !has_disallowed
+}
+
+/// Checks if the passed block is a simple identity referring to bindings created by the pattern
+fn expr_is_simple_identity(pat: &'_ Pat<'_>, expr: &'_ Expr<'_>) -> bool {
+ // We support patterns with multiple bindings and tuples, like:
+ // let ... = if let (Some(foo), bar) = g() { (foo, bar) } else { ... }
+ let peeled = peel_blocks(expr);
+ let paths = match peeled.kind {
+ ExprKind::Tup(exprs) | ExprKind::Array(exprs) => exprs,
+ ExprKind::Path(_) => std::slice::from_ref(peeled),
+ _ => return false,
+ };
+ let mut pat_bindings = FxHashSet::default();
+ pat.each_binding_or_first(&mut |_ann, _hir_id, _sp, ident| {
+ pat_bindings.insert(ident);
+ });
+ if pat_bindings.len() < paths.len() {
+ return false;
+ }
+ for path in paths {
+ if_chain! {
+ if let ExprKind::Path(QPath::Resolved(_ty, path)) = path.kind;
+ if let [path_seg] = path.segments;
+ then {
+ if !pat_bindings.remove(&path_seg.ident) {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ }
+ }
+ true
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, Deserialize)]
+pub enum MatchLintBehaviour {
+ AllTypes,
+ WellKnownTypes,
+ Never,
+}
--- /dev/null
- && match_def_path(cx, collect_def_id, &paths::CORE_ITER_COLLECT) {
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::source::snippet;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
+use clippy_utils::{get_parent_expr, match_def_path, paths, SpanlessEq};
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_hir::ExprKind::Assign;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::sym;
+
+const ACCEPTABLE_METHODS: [&[&str]; 4] = [
+ &paths::HASHSET_ITER,
+ &paths::BTREESET_ITER,
+ &paths::SLICE_INTO,
+ &paths::VEC_DEQUE_ITER,
+];
+const ACCEPTABLE_TYPES: [(rustc_span::Symbol, Option<RustcVersion>); 6] = [
+ (sym::BTreeSet, Some(msrvs::BTREE_SET_RETAIN)),
+ (sym::BTreeMap, Some(msrvs::BTREE_MAP_RETAIN)),
+ (sym::HashSet, Some(msrvs::HASH_SET_RETAIN)),
+ (sym::HashMap, Some(msrvs::HASH_MAP_RETAIN)),
+ (sym::Vec, None),
+ (sym::VecDeque, None),
+];
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for code to be replaced by `.retain()`.
+ /// ### Why is this bad?
+ /// `.retain()` is simpler and avoids needless allocation.
+ /// ### Example
+ /// ```rust
+ /// let mut vec = vec![0, 1, 2];
+ /// vec = vec.iter().filter(|&x| x % 2 == 0).copied().collect();
+ /// vec = vec.into_iter().filter(|x| x % 2 == 0).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let mut vec = vec![0, 1, 2];
+ /// vec.retain(|x| x % 2 == 0);
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub MANUAL_RETAIN,
+ perf,
+ "`retain()` is simpler and the same functionalitys"
+}
+
+pub struct ManualRetain {
+ msrv: Msrv,
+}
+
+impl ManualRetain {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(ManualRetain => [MANUAL_RETAIN]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualRetain {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if let Some(parent_expr) = get_parent_expr(cx, expr)
+ && let Assign(left_expr, collect_expr, _) = &parent_expr.kind
+ && let hir::ExprKind::MethodCall(seg, ..) = &collect_expr.kind
+ && seg.args.is_none()
+ && let hir::ExprKind::MethodCall(_, target_expr, [], _) = &collect_expr.kind
+ && let Some(collect_def_id) = cx.typeck_results().type_dependent_def_id(collect_expr.hir_id)
++ && cx.tcx.is_diagnostic_item(sym::iterator_collect_fn, collect_def_id)
++ {
+ check_into_iter(cx, parent_expr, left_expr, target_expr, &self.msrv);
+ check_iter(cx, parent_expr, left_expr, target_expr, &self.msrv);
+ check_to_owned(cx, parent_expr, left_expr, target_expr, &self.msrv);
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+fn check_into_iter(
+ cx: &LateContext<'_>,
+ parent_expr: &hir::Expr<'_>,
+ left_expr: &hir::Expr<'_>,
+ target_expr: &hir::Expr<'_>,
+ msrv: &Msrv,
+) {
+ if let hir::ExprKind::MethodCall(_, into_iter_expr, [_], _) = &target_expr.kind
+ && let Some(filter_def_id) = cx.typeck_results().type_dependent_def_id(target_expr.hir_id)
+ && match_def_path(cx, filter_def_id, &paths::CORE_ITER_FILTER)
+ && let hir::ExprKind::MethodCall(_, struct_expr, [], _) = &into_iter_expr.kind
+ && let Some(into_iter_def_id) = cx.typeck_results().type_dependent_def_id(into_iter_expr.hir_id)
+ && Some(into_iter_def_id) == cx.tcx.lang_items().into_iter_fn()
+ && match_acceptable_type(cx, left_expr, msrv)
+ && SpanlessEq::new(cx).eq_expr(left_expr, struct_expr) {
+ suggest(cx, parent_expr, left_expr, target_expr);
+ }
+}
+
+fn check_iter(
+ cx: &LateContext<'_>,
+ parent_expr: &hir::Expr<'_>,
+ left_expr: &hir::Expr<'_>,
+ target_expr: &hir::Expr<'_>,
+ msrv: &Msrv,
+) {
+ if let hir::ExprKind::MethodCall(_, filter_expr, [], _) = &target_expr.kind
+ && let Some(copied_def_id) = cx.typeck_results().type_dependent_def_id(target_expr.hir_id)
+ && (match_def_path(cx, copied_def_id, &paths::CORE_ITER_COPIED)
+ || match_def_path(cx, copied_def_id, &paths::CORE_ITER_CLONED))
+ && let hir::ExprKind::MethodCall(_, iter_expr, [_], _) = &filter_expr.kind
+ && let Some(filter_def_id) = cx.typeck_results().type_dependent_def_id(filter_expr.hir_id)
+ && match_def_path(cx, filter_def_id, &paths::CORE_ITER_FILTER)
+ && let hir::ExprKind::MethodCall(_, struct_expr, [], _) = &iter_expr.kind
+ && let Some(iter_expr_def_id) = cx.typeck_results().type_dependent_def_id(iter_expr.hir_id)
+ && match_acceptable_def_path(cx, iter_expr_def_id)
+ && match_acceptable_type(cx, left_expr, msrv)
+ && SpanlessEq::new(cx).eq_expr(left_expr, struct_expr) {
+ suggest(cx, parent_expr, left_expr, filter_expr);
+ }
+}
+
+fn check_to_owned(
+ cx: &LateContext<'_>,
+ parent_expr: &hir::Expr<'_>,
+ left_expr: &hir::Expr<'_>,
+ target_expr: &hir::Expr<'_>,
+ msrv: &Msrv,
+) {
+ if msrv.meets(msrvs::STRING_RETAIN)
+ && let hir::ExprKind::MethodCall(_, filter_expr, [], _) = &target_expr.kind
+ && let Some(to_owned_def_id) = cx.typeck_results().type_dependent_def_id(target_expr.hir_id)
+ && match_def_path(cx, to_owned_def_id, &paths::TO_OWNED_METHOD)
+ && let hir::ExprKind::MethodCall(_, chars_expr, [_], _) = &filter_expr.kind
+ && let Some(filter_def_id) = cx.typeck_results().type_dependent_def_id(filter_expr.hir_id)
+ && match_def_path(cx, filter_def_id, &paths::CORE_ITER_FILTER)
+ && let hir::ExprKind::MethodCall(_, str_expr, [], _) = &chars_expr.kind
+ && let Some(chars_expr_def_id) = cx.typeck_results().type_dependent_def_id(chars_expr.hir_id)
+ && match_def_path(cx, chars_expr_def_id, &paths::STR_CHARS)
+ && let ty = cx.typeck_results().expr_ty(str_expr).peel_refs()
+ && is_type_lang_item(cx, ty, hir::LangItem::String)
+ && SpanlessEq::new(cx).eq_expr(left_expr, str_expr) {
+ suggest(cx, parent_expr, left_expr, filter_expr);
+ }
+}
+
+fn suggest(cx: &LateContext<'_>, parent_expr: &hir::Expr<'_>, left_expr: &hir::Expr<'_>, filter_expr: &hir::Expr<'_>) {
+ if let hir::ExprKind::MethodCall(_, _, [closure], _) = filter_expr.kind
+ && let hir::ExprKind::Closure(&hir::Closure { body, ..}) = closure.kind
+ && let filter_body = cx.tcx.hir().body(body)
+ && let [filter_params] = filter_body.params
+ && let Some(sugg) = match filter_params.pat.kind {
+ hir::PatKind::Binding(_, _, filter_param_ident, None) => {
+ Some(format!("{}.retain(|{filter_param_ident}| {})", snippet(cx, left_expr.span, ".."), snippet(cx, filter_body.value.span, "..")))
+ },
+ hir::PatKind::Tuple([key_pat, value_pat], _) => {
+ make_sugg(cx, key_pat, value_pat, left_expr, filter_body)
+ },
+ hir::PatKind::Ref(pat, _) => {
+ match pat.kind {
+ hir::PatKind::Binding(_, _, filter_param_ident, None) => {
+ Some(format!("{}.retain(|{filter_param_ident}| {})", snippet(cx, left_expr.span, ".."), snippet(cx, filter_body.value.span, "..")))
+ },
+ _ => None
+ }
+ },
+ _ => None
+ } {
+ span_lint_and_sugg(
+ cx,
+ MANUAL_RETAIN,
+ parent_expr.span,
+ "this expression can be written more simply using `.retain()`",
+ "consider calling `.retain()` instead",
+ sugg,
+ Applicability::MachineApplicable
+ );
+ }
+}
+
+fn make_sugg(
+ cx: &LateContext<'_>,
+ key_pat: &rustc_hir::Pat<'_>,
+ value_pat: &rustc_hir::Pat<'_>,
+ left_expr: &hir::Expr<'_>,
+ filter_body: &hir::Body<'_>,
+) -> Option<String> {
+ match (&key_pat.kind, &value_pat.kind) {
+ (hir::PatKind::Binding(_, _, key_param_ident, None), hir::PatKind::Binding(_, _, value_param_ident, None)) => {
+ Some(format!(
+ "{}.retain(|{key_param_ident}, &mut {value_param_ident}| {})",
+ snippet(cx, left_expr.span, ".."),
+ snippet(cx, filter_body.value.span, "..")
+ ))
+ },
+ (hir::PatKind::Binding(_, _, key_param_ident, None), hir::PatKind::Wild) => Some(format!(
+ "{}.retain(|{key_param_ident}, _| {})",
+ snippet(cx, left_expr.span, ".."),
+ snippet(cx, filter_body.value.span, "..")
+ )),
+ (hir::PatKind::Wild, hir::PatKind::Binding(_, _, value_param_ident, None)) => Some(format!(
+ "{}.retain(|_, &mut {value_param_ident}| {})",
+ snippet(cx, left_expr.span, ".."),
+ snippet(cx, filter_body.value.span, "..")
+ )),
+ _ => None,
+ }
+}
+
+fn match_acceptable_def_path(cx: &LateContext<'_>, collect_def_id: DefId) -> bool {
+ ACCEPTABLE_METHODS
+ .iter()
+ .any(|&method| match_def_path(cx, collect_def_id, method))
+}
+
+fn match_acceptable_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>, msrv: &Msrv) -> bool {
+ let expr_ty = cx.typeck_results().expr_ty(expr).peel_refs();
+ ACCEPTABLE_TYPES.iter().any(|(ty, acceptable_msrv)| {
+ is_type_diagnostic_item(cx, expr_ty, *ty)
+ && acceptable_msrv.map_or(true, |acceptable_msrv| msrv.meets(acceptable_msrv))
+ })
+}
--- /dev/null
- use clippy_utils::ty::peel_mid_ty_refs;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_context;
++use clippy_utils::ty::{implements_trait, peel_mid_ty_refs};
+use clippy_utils::{is_diag_item_method, is_diag_trait_item};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_span::sym;
+
+use super::IMPLICIT_CLONE;
+
+pub fn check(cx: &LateContext<'_>, method_name: &str, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>) {
+ if_chain! {
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if is_clone_like(cx, method_name, method_def_id);
+ let return_type = cx.typeck_results().expr_ty(expr);
+ let input_type = cx.typeck_results().expr_ty(recv);
+ let (input_type, ref_count) = peel_mid_ty_refs(input_type);
+ if let Some(ty_name) = input_type.ty_adt_def().map(|adt_def| cx.tcx.item_name(adt_def.did()));
+ if return_type == input_type;
++ if let Some(clone_trait) = cx.tcx.lang_items().clone_trait();
++ if implements_trait(cx, return_type, clone_trait, &[]);
+ then {
+ let mut app = Applicability::MachineApplicable;
+ let recv_snip = snippet_with_context(cx, recv.span, expr.span.ctxt(), "..", &mut app).0;
+ span_lint_and_sugg(
+ cx,
+ IMPLICIT_CLONE,
+ expr.span,
+ &format!("implicitly cloning a `{ty_name}` by calling `{method_name}` on its dereferenced type"),
+ "consider using",
+ if ref_count > 1 {
+ format!("({}{recv_snip}).clone()", "*".repeat(ref_count - 1))
+ } else {
+ format!("{recv_snip}.clone()")
+ },
+ app,
+ );
+ }
+ }
+}
+
+/// Returns true if the named method can be used to clone the receiver.
+/// Note that `to_string` is not flagged by `implicit_clone`. So other lints that call
+/// `is_clone_like` and that do flag `to_string` must handle it separately. See, e.g.,
+/// `is_to_owned_like` in `unnecessary_to_owned.rs`.
+pub fn is_clone_like(cx: &LateContext<'_>, method_name: &str, method_def_id: hir::def_id::DefId) -> bool {
+ match method_name {
+ "to_os_string" => is_diag_item_method(cx, method_def_id, sym::OsStr),
+ "to_owned" => is_diag_trait_item(cx, method_def_id, sym::ToOwned),
+ "to_path_buf" => is_diag_item_method(cx, method_def_id, sym::Path),
+ "to_vec" => cx
+ .tcx
+ .impl_of_method(method_def_id)
+ .filter(|&impl_did| cx.tcx.type_of(impl_did).is_slice() && cx.tcx.impl_trait_ref(impl_did).is_none())
+ .is_some(),
+ _ => false,
+ }
+}
--- /dev/null
- #[clippy::version = "1.65.0"]
+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_collect;
+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 seek_from_current;
+mod seek_to_start_instead_of_rewind;
+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::msrvs::{self, Msrv};
+use clippy_utils::ty::{contains_ty_adt_constructor_opaque, implements_trait, is_copy, is_type_diagnostic_item};
+use clippy_utils::{contains_return, is_bool, is_trait_method, iter_input_pats, return_ty};
+use if_chain::if_chain;
+use rustc_hir as hir;
+use rustc_hir::{Expr, ExprKind, 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_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 = "1.65.0"]
+ 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. This is only bad if it allocates or
+ /// does some non-trivial amount of work.
+ ///
+ /// ### 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.
+ ///
+ /// The lint also cannot figure out whether the function you call is
+ /// actually expensive to call or not.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or(String::from("empty"));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_else(|| String::from("empty"));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OR_FUN_CALL,
+ nursery,
+ "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 its 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: String = cow.into_owned();
+ /// ```
+ #[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 = "1.65.0"]
+ 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 = "1.65.0"]
+ 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<_>>();
+ /// ```
- if name == "replace" && let Some(("replace", ..)) = method_call(recv) {
++ #[clippy::version = "1.66.0"]
+ pub ITER_KV_MAP,
+ complexity,
+ "iterating on map using `iter` when `keys` or `values` would do"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks an argument of `seek` method of `Seek` trait
+ /// and if it start seek from `SeekFrom::Current(0)`, suggests `stream_position` instead.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Readability. Use dedicated method.
+ ///
+ /// ### Example
+ ///
+ /// ```rust,no_run
+ /// use std::fs::File;
+ /// use std::io::{self, Write, Seek, SeekFrom};
+ ///
+ /// fn main() -> io::Result<()> {
+ /// let mut f = File::create("foo.txt")?;
+ /// f.write_all(b"Hello")?;
+ /// eprintln!("Written {} bytes", f.seek(SeekFrom::Current(0))?);
+ ///
+ /// Ok(())
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust,no_run
+ /// use std::fs::File;
+ /// use std::io::{self, Write, Seek, SeekFrom};
+ ///
+ /// fn main() -> io::Result<()> {
+ /// let mut f = File::create("foo.txt")?;
+ /// f.write_all(b"Hello")?;
+ /// eprintln!("Written {} bytes", f.stream_position()?);
+ ///
+ /// Ok(())
+ /// }
+ /// ```
+ #[clippy::version = "1.66.0"]
+ pub SEEK_FROM_CURRENT,
+ complexity,
+ "use dedicated method for seek from current position"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks for jumps to the start of a stream that implements `Seek`
+ /// and uses the `seek` method providing `Start` as parameter.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Readability. There is a specific method that was implemented for
+ /// this exact scenario.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::io;
+ /// fn foo<T: io::Seek>(t: &mut T) {
+ /// t.seek(io::SeekFrom::Start(0));
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::io;
+ /// fn foo<T: io::Seek>(t: &mut T) {
+ /// t.rewind();
+ /// }
+ /// ```
+ #[clippy::version = "1.66.0"]
+ pub SEEK_TO_START_INSTEAD_OF_REWIND,
+ complexity,
+ "jumping to the start of stream using `seek` method"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for functions collecting an iterator when collect
+ /// is not needed.
+ ///
+ /// ### Why is this bad?
+ /// `collect` causes the allocation of a new data structure,
+ /// when this allocation may not be needed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iterator = vec![1].into_iter();
+ /// let len = iterator.clone().collect::<Vec<_>>().len();
+ /// // should be
+ /// let len = iterator.count();
+ /// ```
+ #[clippy::version = "1.30.0"]
+ pub NEEDLESS_COLLECT,
+ nursery,
+ "collecting an iterator when collect is not needed"
+}
+
+pub struct Methods {
+ avoid_breaking_exported_api: bool,
+ msrv: Msrv,
+ allow_expect_in_tests: bool,
+ allow_unwrap_in_tests: bool,
+}
+
+impl Methods {
+ #[must_use]
+ pub fn new(
+ avoid_breaking_exported_api: bool,
+ msrv: Msrv,
+ 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,
+ SEEK_FROM_CURRENT,
+ SEEK_TO_START_INSTEAD_OF_REWIND,
+ NEEDLESS_COLLECT,
+]);
+
+/// 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, Span)> {
+ if let ExprKind::MethodCall(path, receiver, args, call_span) = 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, call_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.owner_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.owner_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.effective_visibilities.is_exported(impl_item.owner_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.effective_visibilities.is_exported(impl_item.owner_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());
+
+ if contains_ty_adt_constructor_opaque(cx, ret_ty, 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);
+ let self_ty = TraitRef::identity(cx.tcx, item.owner_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,
+ 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 self_ty = TraitRef::identity(cx.tcx, item.owner_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, call_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", []) if is_trait_method(cx, expr, sym::Iterator) => {
+ needless_collect::check(cx, span, expr, recv, call_span);
+ 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);
+ },
+ Some(("take", take_self_arg, [take_arg], _, _)) => {
+ if self.msrv.meets(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, span, err_span, &self.msrv),
+ _ => 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 self.msrv.meets(msrvs::PATTERN_TRAIT_CHAR_ARRAY)
++ && 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);
+ },
+ ("seek", [arg]) => {
+ if self.msrv.meets(msrvs::SEEK_FROM_CURRENT) {
+ seek_from_current::check(cx, expr, recv, arg);
+ }
+ if self.msrv.meets(msrvs::SEEK_REWIND) {
+ seek_to_start_instead_of_rewind::check(cx, expr, recv, 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 !self.msrv.meets(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_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 fn_header_equals(expected: hir::FnHeader, actual: hir::FnHeader) -> bool {
+ expected.constness == actual.constness
+ && expected.unsafety == actual.unsafety
+ && expected.asyncness == actual.asyncness
+}
--- /dev/null
- use clippy_utils::{get_trait_def_id, match_def_path, paths};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::ty::implements_trait;
++use clippy_utils::{get_trait_def_id, is_expr_used_or_unified, match_def_path, paths};
+use rustc_ast::ast::{LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::LateContext;
+use rustc_span::Span;
+
+use super::SEEK_TO_START_INSTEAD_OF_REWIND;
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ recv: &'tcx Expr<'_>,
+ arg: &'tcx Expr<'_>,
+ name_span: Span,
+) {
+ // Get receiver type
+ let ty = cx.typeck_results().expr_ty(recv).peel_refs();
+
++ if is_expr_used_or_unified(cx.tcx, expr) {
++ return;
++ }
++
+ if let Some(seek_trait_id) = get_trait_def_id(cx, &paths::STD_IO_SEEK) &&
+ implements_trait(cx, ty, seek_trait_id, &[]) &&
+ let ExprKind::Call(func, args1) = arg.kind &&
+ let ExprKind::Path(ref path) = func.kind &&
+ let Some(def_id) = cx.qpath_res(path, func.hir_id).opt_def_id() &&
+ match_def_path(cx, def_id, &paths::STD_IO_SEEKFROM_START) &&
+ args1.len() == 1 &&
+ let ExprKind::Lit(ref lit) = args1[0].kind &&
+ let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node
+ {
+ let method_call_span = expr.span.with_lo(name_span.lo());
+ span_lint_and_then(
+ cx,
+ SEEK_TO_START_INSTEAD_OF_REWIND,
+ method_call_span,
+ "used `seek` to go to the start of the stream",
+ |diag| {
+ let app = Applicability::MachineApplicable;
+
+ diag.span_suggestion(method_call_span, "replace with", "rewind()", app);
+ },
+ );
+ }
+}
--- /dev/null
- use rustc_session::{declare_lint_pass, declare_tool_lint};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_hir_and_then};
+use clippy_utils::source::{snippet, snippet_opt};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{
+ self as hir, def, BinOpKind, BindingAnnotation, Body, ByRef, Expr, ExprKind, FnDecl, HirId, Mutability, PatKind,
+ Stmt, StmtKind, TyKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
- use clippy_utils::{get_parent_expr, in_constant, is_integer_literal, iter_input_pats, last_path_segment, SpanlessEq};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::hygiene::DesugaringKind;
+use rustc_span::source_map::{ExpnKind, Span};
+
+use clippy_utils::sugg::Sugg;
- declare_lint_pass!(MiscLints => [
++use clippy_utils::{
++ get_parent_expr, in_constant, is_integer_literal, is_no_std_crate, iter_input_pats, last_path_segment, SpanlessEq,
++};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for function arguments and let bindings denoted as
+ /// `ref`.
+ ///
+ /// ### Why is this bad?
+ /// The `ref` declaration makes the function take an owned
+ /// value, but turns the argument into a reference (which means that the value
+ /// is destroyed when exiting the function). This adds not much value: either
+ /// take a reference type, or take an owned value and create references in the
+ /// body.
+ ///
+ /// For let bindings, `let x = &foo;` is preferred over `let ref x = foo`. The
+ /// type of `x` is more obvious with the former.
+ ///
+ /// ### Known problems
+ /// If the argument is dereferenced within the function,
+ /// removing the `ref` will lead to errors. This can be fixed by removing the
+ /// dereferences, e.g., changing `*x` to `x` within the function.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(ref _x: u8) {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// fn foo(_x: &u8) {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub TOPLEVEL_REF_ARG,
+ style,
+ "an entire binding declared as `ref`, in a function argument or a `let` statement"
+}
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of bindings with a single leading
+ /// underscore.
+ ///
+ /// ### Why is this bad?
+ /// A single leading underscore is usually used to indicate
+ /// that a binding will not be used. Using such a binding breaks this
+ /// expectation.
+ ///
+ /// ### Known problems
+ /// The lint does not work properly with desugaring and
+ /// macro, it has been allowed in the mean time.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _x = 0;
+ /// let y = _x + 1; // Here we are using `_x`, even though it has a leading
+ /// // underscore. We should rename `_x` to `x`
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub USED_UNDERSCORE_BINDING,
+ pedantic,
+ "using a binding which is prefixed with an underscore"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of short circuit boolean conditions as
+ /// a
+ /// statement.
+ ///
+ /// ### Why is this bad?
+ /// Using a short circuit boolean condition as a statement
+ /// may hide the fact that the second part is executed or not depending on the
+ /// outcome of the first part.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// f() && g(); // We should write `if f() { g(); }`.
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHORT_CIRCUIT_STATEMENT,
+ complexity,
+ "using a short circuit boolean condition as a statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Catch casts from `0` to some pointer type
+ ///
+ /// ### Why is this bad?
+ /// This generally means `null` and is better expressed as
+ /// {`std`, `core`}`::ptr::`{`null`, `null_mut`}.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = 0 as *const u32;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let a = std::ptr::null::<u32>();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ZERO_PTR,
+ style,
+ "using `0 as *{const, mut} T`"
+}
+
- impl<'tcx> LateLintPass<'tcx> for MiscLints {
++pub struct LintPass {
++ std_or_core: &'static str,
++}
++impl Default for LintPass {
++ fn default() -> Self {
++ Self { std_or_core: "std" }
++ }
++}
++impl_lint_pass!(LintPass => [
+ TOPLEVEL_REF_ARG,
+ USED_UNDERSCORE_BINDING,
+ SHORT_CIRCUIT_STATEMENT,
+ ZERO_PTR,
+]);
+
- check_cast(cx, expr.span, e, ty);
++impl<'tcx> LateLintPass<'tcx> for LintPass {
++ fn check_crate(&mut self, cx: &LateContext<'_>) {
++ if is_no_std_crate(cx) {
++ self.std_or_core = "core";
++ }
++ }
++
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ k: FnKind<'tcx>,
+ decl: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ span: Span,
+ _: HirId,
+ ) {
+ if let FnKind::Closure = k {
+ // Does not apply to closures
+ return;
+ }
+ if in_external_macro(cx.tcx.sess, span) {
+ return;
+ }
+ for arg in iter_input_pats(decl, body) {
+ if let PatKind::Binding(BindingAnnotation(ByRef::Yes, _), ..) = arg.pat.kind {
+ span_lint(
+ cx,
+ TOPLEVEL_REF_ARG,
+ arg.pat.span,
+ "`ref` directly on a function argument is ignored. \
+ Consider using a reference type instead",
+ );
+ }
+ }
+ }
+
+ fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
+ if_chain! {
+ if !in_external_macro(cx.tcx.sess, stmt.span);
+ if let StmtKind::Local(local) = stmt.kind;
+ if let PatKind::Binding(BindingAnnotation(ByRef::Yes, mutabl), .., name, None) = local.pat.kind;
+ if let Some(init) = local.init;
+ then {
+ // use the macro callsite when the init span (but not the whole local span)
+ // comes from an expansion like `vec![1, 2, 3]` in `let ref _ = vec![1, 2, 3];`
+ let sugg_init = if init.span.from_expansion() && !local.span.from_expansion() {
+ Sugg::hir_with_macro_callsite(cx, init, "..")
+ } else {
+ Sugg::hir(cx, init, "..")
+ };
+ let (mutopt, initref) = if mutabl == Mutability::Mut {
+ ("mut ", sugg_init.mut_addr())
+ } else {
+ ("", sugg_init.addr())
+ };
+ let tyopt = if let Some(ty) = local.ty {
+ format!(": &{mutopt}{ty}", ty=snippet(cx, ty.span, ".."))
+ } else {
+ String::new()
+ };
+ span_lint_hir_and_then(
+ cx,
+ TOPLEVEL_REF_ARG,
+ init.hir_id,
+ local.pat.span,
+ "`ref` on an entire `let` pattern is discouraged, take a reference with `&` instead",
+ |diag| {
+ diag.span_suggestion(
+ stmt.span,
+ "try",
+ format!(
+ "let {name}{tyopt} = {initref};",
+ name=snippet(cx, name.span, ".."),
+ ),
+ Applicability::MachineApplicable,
+ );
+ }
+ );
+ }
+ };
+ if_chain! {
+ if let StmtKind::Semi(expr) = stmt.kind;
+ if let ExprKind::Binary(ref binop, a, b) = expr.kind;
+ if binop.node == BinOpKind::And || binop.node == BinOpKind::Or;
+ if let Some(sugg) = Sugg::hir_opt(cx, a);
+ then {
+ span_lint_hir_and_then(
+ cx,
+ SHORT_CIRCUIT_STATEMENT,
+ expr.hir_id,
+ stmt.span,
+ "boolean short circuit operator in statement may be clearer using an explicit test",
+ |diag| {
+ let sugg = if binop.node == BinOpKind::Or { !sugg } else { sugg };
+ diag.span_suggestion(
+ stmt.span,
+ "replace it with",
+ format!(
+ "if {sugg} {{ {}; }}",
+ &snippet(cx, b.span, ".."),
+ ),
+ Applicability::MachineApplicable, // snippet
+ );
+ });
+ }
+ };
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Cast(e, ty) = expr.kind {
- fn check_cast(cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &hir::Ty<'_>) {
- if_chain! {
- if let TyKind::Ptr(ref mut_ty) = ty.kind;
- if is_integer_literal(e, 0);
- if !in_constant(cx, e.hir_id);
- then {
- let (msg, sugg_fn) = match mut_ty.mutbl {
- Mutability::Mut => ("`0 as *mut _` detected", "std::ptr::null_mut"),
- Mutability::Not => ("`0 as *const _` detected", "std::ptr::null"),
- };
++ self.check_cast(cx, expr.span, e, ty);
+ return;
+ }
+ if in_attributes_expansion(expr) || expr.span.is_desugaring(DesugaringKind::Await) {
+ // Don't lint things expanded by #[derive(...)], etc or `await` desugaring
+ return;
+ }
+ let sym;
+ let binding = match expr.kind {
+ ExprKind::Path(ref qpath) if !matches!(qpath, hir::QPath::LangItem(..)) => {
+ let binding = last_path_segment(qpath).ident.as_str();
+ if binding.starts_with('_') &&
+ !binding.starts_with("__") &&
+ binding != "_result" && // FIXME: #944
+ is_used(cx, expr) &&
+ // don't lint if the declaration is in a macro
+ non_macro_local(cx, cx.qpath_res(qpath, expr.hir_id))
+ {
+ Some(binding)
+ } else {
+ None
+ }
+ },
+ ExprKind::Field(_, ident) => {
+ sym = ident.name;
+ let name = sym.as_str();
+ if name.starts_with('_') && !name.starts_with("__") {
+ Some(name)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ };
+ if let Some(binding) = binding {
+ span_lint(
+ cx,
+ USED_UNDERSCORE_BINDING,
+ expr.span,
+ &format!(
+ "used binding `{binding}` which is prefixed with an underscore. A leading \
+ underscore signals that a binding will not be used"
+ ),
+ );
+ }
+ }
+}
+
+/// Heuristic to see if an expression is used. Should be compatible with
+/// `unused_variables`'s idea
+/// of what it means for an expression to be "used".
+fn is_used(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ get_parent_expr(cx, expr).map_or(true, |parent| match parent.kind {
+ ExprKind::Assign(_, rhs, _) | ExprKind::AssignOp(_, _, rhs) => SpanlessEq::new(cx).eq_expr(rhs, expr),
+ _ => is_used(cx, parent),
+ })
+}
+
+/// Tests whether an expression is in a macro expansion (e.g., something
+/// generated by `#[derive(...)]` or the like).
+fn in_attributes_expansion(expr: &Expr<'_>) -> bool {
+ use rustc_span::hygiene::MacroKind;
+ if expr.span.from_expansion() {
+ let data = expr.span.ctxt().outer_expn_data();
+ matches!(data.kind, ExpnKind::Macro(MacroKind::Attr | MacroKind::Derive, _))
+ } else {
+ false
+ }
+}
+
+/// Tests whether `res` is a variable defined outside a macro.
+fn non_macro_local(cx: &LateContext<'_>, res: def::Res) -> bool {
+ if let def::Res::Local(id) = res {
+ !cx.tcx.hir().span(id).from_expansion()
+ } else {
+ false
+ }
+}
+
- let (sugg, appl) = if let TyKind::Infer = mut_ty.ty.kind {
- (format!("{sugg_fn}()"), Applicability::MachineApplicable)
- } else if let Some(mut_ty_snip) = snippet_opt(cx, mut_ty.ty.span) {
- (format!("{sugg_fn}::<{mut_ty_snip}>()"), Applicability::MachineApplicable)
- } else {
- // `MaybeIncorrect` as type inference may not work with the suggested code
- (format!("{sugg_fn}()"), Applicability::MaybeIncorrect)
- };
- span_lint_and_sugg(cx, ZERO_PTR, span, msg, "try", sugg, appl);
++impl LintPass {
++ fn check_cast(&self, cx: &LateContext<'_>, span: Span, e: &Expr<'_>, ty: &hir::Ty<'_>) {
++ if_chain! {
++ if let TyKind::Ptr(ref mut_ty) = ty.kind;
++ if is_integer_literal(e, 0);
++ if !in_constant(cx, e.hir_id);
++ then {
++ let (msg, sugg_fn) = match mut_ty.mutbl {
++ Mutability::Mut => ("`0 as *mut _` detected", "ptr::null_mut"),
++ Mutability::Not => ("`0 as *const _` detected", "ptr::null"),
++ };
+
++ let (sugg, appl) = if let TyKind::Infer = mut_ty.ty.kind {
++ (format!("{}::{sugg_fn}()", self.std_or_core), Applicability::MachineApplicable)
++ } else if let Some(mut_ty_snip) = snippet_opt(cx, mut_ty.ty.span) {
++ (format!("{}::{sugg_fn}::<{mut_ty_snip}>()", self.std_or_core), Applicability::MachineApplicable)
++ } else {
++ // `MaybeIncorrect` as type inference may not work with the suggested code
++ (format!("{}::{sugg_fn}()", self.std_or_core), Applicability::MaybeIncorrect)
++ };
++ span_lint_and_sugg(cx, ZERO_PTR, span, msg, "try", sugg, appl);
++ }
+ }
+ }
+}
--- /dev/null
- use rustc_data_structures::fx::FxHashSet;
+use super::ARITHMETIC_SIDE_EFFECTS;
+use clippy_utils::{
+ consts::{constant, constant_simple},
+ diagnostics::span_lint,
+ peel_hir_expr_refs,
+};
+use rustc_ast as ast;
- const HARD_CODED_ALLOWED: &[&str] = &[
- "&str",
- "f32",
- "f64",
- "std::num::Saturating",
- "std::num::Wrapping",
- "std::string::String",
++use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir as hir;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::Ty;
+use rustc_session::impl_lint_pass;
+use rustc_span::source_map::{Span, Spanned};
+
- allowed: FxHashSet<String>,
++const HARD_CODED_ALLOWED_BINARY: &[[&str; 2]] = &[
++ ["f32", "f32"],
++ ["f64", "f64"],
++ ["std::num::Saturating", "std::num::Saturating"],
++ ["std::num::Wrapping", "std::num::Wrapping"],
++ ["std::string::String", "&str"],
+];
++const HARD_CODED_ALLOWED_UNARY: &[&str] = &["f32", "f64", "std::num::Saturating", "std::num::Wrapping"];
+
+#[derive(Debug)]
+pub struct ArithmeticSideEffects {
- pub fn new(mut allowed: FxHashSet<String>) -> Self {
- allowed.extend(HARD_CODED_ALLOWED.iter().copied().map(String::from));
++ allowed_binary: FxHashMap<String, FxHashSet<String>>,
++ allowed_unary: FxHashSet<String>,
+ // Used to check whether expressions are constants, such as in enum discriminants and consts
+ const_span: Option<Span>,
+ expr_span: Option<Span>,
+}
+
+impl_lint_pass!(ArithmeticSideEffects => [ARITHMETIC_SIDE_EFFECTS]);
+
+impl ArithmeticSideEffects {
+ #[must_use]
- allowed,
++ pub fn new(user_allowed_binary: Vec<[String; 2]>, user_allowed_unary: Vec<String>) -> Self {
++ let mut allowed_binary: FxHashMap<String, FxHashSet<String>> = <_>::default();
++ for [lhs, rhs] in user_allowed_binary.into_iter().chain(
++ HARD_CODED_ALLOWED_BINARY
++ .iter()
++ .copied()
++ .map(|[lhs, rhs]| [lhs.to_string(), rhs.to_string()]),
++ ) {
++ allowed_binary.entry(lhs).or_default().insert(rhs);
++ }
++ let allowed_unary = user_allowed_unary
++ .into_iter()
++ .chain(HARD_CODED_ALLOWED_UNARY.iter().copied().map(String::from))
++ .collect();
+ Self {
- /// Checks if the given `expr` has any of the inner `allowed` elements.
- fn is_allowed_ty(&self, ty: Ty<'_>) -> bool {
- self.allowed
- .contains(ty.to_string().split('<').next().unwrap_or_default())
++ allowed_binary,
++ allowed_unary,
+ const_span: None,
+ expr_span: None,
+ }
+ }
+
- let lhs_and_rhs_have_the_same_ty = lhs_ty == rhs_ty;
- if lhs_and_rhs_have_the_same_ty && self.is_allowed_ty(lhs_ty) && self.is_allowed_ty(rhs_ty) {
++ /// Checks if the lhs and the rhs types of a binary operation like "addition" or
++ /// "multiplication" are present in the inner set of allowed types.
++ fn has_allowed_binary(&self, lhs_ty: Ty<'_>, rhs_ty: Ty<'_>) -> bool {
++ let lhs_ty_string = lhs_ty.to_string();
++ let lhs_ty_string_elem = lhs_ty_string.split('<').next().unwrap_or_default();
++ let rhs_ty_string = rhs_ty.to_string();
++ let rhs_ty_string_elem = rhs_ty_string.split('<').next().unwrap_or_default();
++ if let Some(rhs_from_specific) = self.allowed_binary.get(lhs_ty_string_elem)
++ && {
++ let rhs_has_allowed_ty = rhs_from_specific.contains(rhs_ty_string_elem);
++ rhs_has_allowed_ty || rhs_from_specific.contains("*")
++ }
++ {
++ true
++ } else if let Some(rhs_from_glob) = self.allowed_binary.get("*") {
++ rhs_from_glob.contains(rhs_ty_string_elem)
++ } else {
++ false
++ }
++ }
++
++ /// Checks if the type of an unary operation like "negation" is present in the inner set of
++ /// allowed types.
++ fn has_allowed_unary(&self, ty: Ty<'_>) -> bool {
++ let ty_string = ty.to_string();
++ let ty_string_elem = ty_string.split('<').next().unwrap_or_default();
++ self.allowed_unary.contains(ty_string_elem)
+ }
+
+ // For example, 8i32 or &i64::MAX.
+ fn is_integral(ty: Ty<'_>) -> bool {
+ ty.peel_refs().is_integral()
+ }
+
+ // Common entry-point to avoid code duplication.
+ fn issue_lint(&mut self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) {
+ let msg = "arithmetic operation that can potentially result in unexpected side-effects";
+ span_lint(cx, ARITHMETIC_SIDE_EFFECTS, expr.span, msg);
+ self.expr_span = Some(expr.span);
+ }
+
+ /// If `expr` is not a literal integer like `1`, returns `None`.
+ fn literal_integer(expr: &hir::Expr<'_>) -> Option<u128> {
+ if let hir::ExprKind::Lit(ref lit) = expr.kind && let ast::LitKind::Int(n, _) = lit.node {
+ Some(n)
+ }
+ else {
+ None
+ }
+ }
+
+ /// Manages when the lint should be triggered. Operations in constant environments, hard coded
+ /// types, custom allowed types and non-constant operations that won't overflow are ignored.
+ fn manage_bin_ops<'tcx>(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'tcx>,
+ op: &Spanned<hir::BinOpKind>,
+ lhs: &hir::Expr<'tcx>,
+ rhs: &hir::Expr<'tcx>,
+ ) {
+ if constant_simple(cx, cx.typeck_results(), expr).is_some() {
+ return;
+ }
+ if !matches!(
+ op.node,
+ hir::BinOpKind::Add
+ | hir::BinOpKind::Sub
+ | hir::BinOpKind::Mul
+ | hir::BinOpKind::Div
+ | hir::BinOpKind::Rem
+ | hir::BinOpKind::Shl
+ | hir::BinOpKind::Shr
+ ) {
+ return;
+ };
+ let lhs_ty = cx.typeck_results().expr_ty(lhs);
+ let rhs_ty = cx.typeck_results().expr_ty(rhs);
- if self.is_allowed_ty(ty) {
++ if self.has_allowed_binary(lhs_ty, rhs_ty) {
+ return;
+ }
+ let has_valid_op = if Self::is_integral(lhs_ty) && Self::is_integral(rhs_ty) {
+ let (actual_lhs, lhs_ref_counter) = peel_hir_expr_refs(lhs);
+ let (actual_rhs, rhs_ref_counter) = peel_hir_expr_refs(rhs);
+ match (Self::literal_integer(actual_lhs), Self::literal_integer(actual_rhs)) {
+ (None, None) => false,
+ (None, Some(n)) | (Some(n), None) => match (&op.node, n) {
+ (hir::BinOpKind::Div | hir::BinOpKind::Rem, 0) => false,
+ (hir::BinOpKind::Add | hir::BinOpKind::Sub, 0)
+ | (hir::BinOpKind::Div | hir::BinOpKind::Rem, _)
+ | (hir::BinOpKind::Mul, 0 | 1) => true,
+ _ => false,
+ },
+ (Some(_), Some(_)) => {
+ matches!((lhs_ref_counter, rhs_ref_counter), (0, 0))
+ },
+ }
+ } else {
+ false
+ };
+ if !has_valid_op {
+ self.issue_lint(cx, expr);
+ }
+ }
+
+ fn manage_unary_ops<'tcx>(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'tcx>,
+ un_expr: &hir::Expr<'tcx>,
+ un_op: hir::UnOp,
+ ) {
+ let hir::UnOp::Neg = un_op else { return; };
+ if constant(cx, cx.typeck_results(), un_expr).is_some() {
+ return;
+ }
+ let ty = cx.typeck_results().expr_ty(expr).peel_refs();
++ if self.has_allowed_unary(ty) {
+ return;
+ }
+ let actual_un_expr = peel_hir_expr_refs(un_expr).0;
+ if Self::literal_integer(actual_un_expr).is_some() {
+ return;
+ }
+ self.issue_lint(cx, expr);
+ }
+
+ fn should_skip_expr(&mut self, expr: &hir::Expr<'_>) -> bool {
+ self.expr_span.is_some() || self.const_span.map_or(false, |sp| sp.contains(expr.span))
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for ArithmeticSideEffects {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &hir::Expr<'tcx>) {
+ if self.should_skip_expr(expr) {
+ return;
+ }
+ match &expr.kind {
+ hir::ExprKind::AssignOp(op, lhs, rhs) | hir::ExprKind::Binary(op, lhs, rhs) => {
+ self.manage_bin_ops(cx, expr, op, lhs, rhs);
+ },
+ hir::ExprKind::Unary(un_op, un_expr) => {
+ self.manage_unary_ops(cx, expr, un_expr, *un_op);
+ },
+ _ => {},
+ }
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'_>, body: &hir::Body<'_>) {
+ let body_owner = cx.tcx.hir().body_owner(body.id());
+ let body_owner_def_id = cx.tcx.hir().local_def_id(body_owner);
+ let body_owner_kind = cx.tcx.hir().body_owner_kind(body_owner_def_id);
+ if let hir::BodyOwnerKind::Const | hir::BodyOwnerKind::Static(_) = body_owner_kind {
+ let body_span = cx.tcx.hir().span_with_body(body_owner);
+ if let Some(span) = self.const_span && span.contains(body_span) {
+ return;
+ }
+ self.const_span = Some(body_span);
+ }
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'_>, body: &hir::Body<'_>) {
+ let body_owner = cx.tcx.hir().body_owner(body.id());
+ let body_span = cx.tcx.hir().span(body_owner);
+ if let Some(span) = self.const_span && span.contains(body_span) {
+ return;
+ }
+ self.const_span = None;
+ }
+
+ fn check_expr_post(&mut self, _: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if Some(expr.span) == self.expr_span {
+ self.expr_span = None;
+ }
+ }
+}
--- /dev/null
- use clippy_utils::{clip, unsext};
+use clippy_utils::consts::{constant_full_int, constant_simple, Constant, FullInt};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
- check_op(cx, left, 0, expr.span, right.span, needs_parenthesis(cx, expr, right));
- check_op(cx, right, 0, expr.span, left.span, Parens::Unneeded);
++use clippy_utils::{clip, peel_hir_expr_refs, unsext};
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, Node};
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+use rustc_span::source_map::Span;
+
+use super::IDENTITY_OP;
+
+pub(crate) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ op: BinOpKind,
+ left: &'tcx Expr<'_>,
+ right: &'tcx Expr<'_>,
+) {
+ if !is_allowed(cx, op, left, right) {
+ match op {
+ BinOpKind::Add | BinOpKind::BitOr | BinOpKind::BitXor => {
- check_op(cx, right, 0, expr.span, left.span, Parens::Unneeded);
++ check_op(
++ cx,
++ left,
++ 0,
++ expr.span,
++ peel_hir_expr_refs(right).0.span,
++ needs_parenthesis(cx, expr, right),
++ );
++ check_op(
++ cx,
++ right,
++ 0,
++ expr.span,
++ peel_hir_expr_refs(left).0.span,
++ Parens::Unneeded,
++ );
+ },
+ BinOpKind::Shl | BinOpKind::Shr | BinOpKind::Sub => {
- check_op(cx, left, 1, expr.span, right.span, needs_parenthesis(cx, expr, right));
- check_op(cx, right, 1, expr.span, left.span, Parens::Unneeded);
++ check_op(
++ cx,
++ right,
++ 0,
++ expr.span,
++ peel_hir_expr_refs(left).0.span,
++ Parens::Unneeded,
++ );
+ },
+ BinOpKind::Mul => {
- BinOpKind::Div => check_op(cx, right, 1, expr.span, left.span, Parens::Unneeded),
++ check_op(
++ cx,
++ left,
++ 1,
++ expr.span,
++ peel_hir_expr_refs(right).0.span,
++ needs_parenthesis(cx, expr, right),
++ );
++ check_op(
++ cx,
++ right,
++ 1,
++ expr.span,
++ peel_hir_expr_refs(left).0.span,
++ Parens::Unneeded,
++ );
+ },
- check_op(cx, left, -1, expr.span, right.span, needs_parenthesis(cx, expr, right));
- check_op(cx, right, -1, expr.span, left.span, Parens::Unneeded);
++ BinOpKind::Div => check_op(
++ cx,
++ right,
++ 1,
++ expr.span,
++ peel_hir_expr_refs(left).0.span,
++ Parens::Unneeded,
++ ),
+ BinOpKind::BitAnd => {
++ check_op(
++ cx,
++ left,
++ -1,
++ expr.span,
++ peel_hir_expr_refs(right).0.span,
++ needs_parenthesis(cx, expr, right),
++ );
++ check_op(
++ cx,
++ right,
++ -1,
++ expr.span,
++ peel_hir_expr_refs(left).0.span,
++ Parens::Unneeded,
++ );
+ },
+ BinOpKind::Rem => check_remainder(cx, left, right, expr.span, left.span),
+ _ => (),
+ }
+ }
+}
+
+#[derive(Copy, Clone)]
+enum Parens {
+ Needed,
+ Unneeded,
+}
+
+/// Checks if `left op right` needs parenthesis when reduced to `right`
+/// e.g. `0 + if b { 1 } else { 2 } + if b { 3 } else { 4 }` cannot be reduced
+/// to `if b { 1 } else { 2 } + if b { 3 } else { 4 }` where the `if` could be
+/// interpreted as a statement
+///
+/// See #8724
+fn needs_parenthesis(cx: &LateContext<'_>, binary: &Expr<'_>, right: &Expr<'_>) -> Parens {
+ match right.kind {
+ ExprKind::Binary(_, lhs, _) | ExprKind::Cast(lhs, _) => {
+ // ensure we're checking against the leftmost expression of `right`
+ //
+ // ~~~ `lhs`
+ // 0 + {4} * 2
+ // ~~~~~~~ `right`
+ return needs_parenthesis(cx, binary, lhs);
+ },
+ ExprKind::If(..) | ExprKind::Match(..) | ExprKind::Block(..) | ExprKind::Loop(..) => {},
+ _ => return Parens::Unneeded,
+ }
+
+ let mut prev_id = binary.hir_id;
+ for (_, node) in cx.tcx.hir().parent_iter(binary.hir_id) {
+ if let Node::Expr(expr) = node
+ && let ExprKind::Binary(_, lhs, _) | ExprKind::Cast(lhs, _) = expr.kind
+ && lhs.hir_id == prev_id
+ {
+ // keep going until we find a node that encompasses left of `binary`
+ prev_id = expr.hir_id;
+ continue;
+ }
+
+ match node {
+ Node::Block(_) | Node::Stmt(_) => break,
+ _ => return Parens::Unneeded,
+ };
+ }
+
+ Parens::Needed
+}
+
+fn is_allowed(cx: &LateContext<'_>, cmp: BinOpKind, left: &Expr<'_>, right: &Expr<'_>) -> bool {
+ // This lint applies to integers
+ !cx.typeck_results().expr_ty(left).peel_refs().is_integral()
+ || !cx.typeck_results().expr_ty(right).peel_refs().is_integral()
+ // `1 << 0` is a common pattern in bit manipulation code
+ || (cmp == BinOpKind::Shl
+ && constant_simple(cx, cx.typeck_results(), right) == Some(Constant::Int(0))
+ && constant_simple(cx, cx.typeck_results(), left) == Some(Constant::Int(1)))
+}
+
+fn check_remainder(cx: &LateContext<'_>, left: &Expr<'_>, right: &Expr<'_>, span: Span, arg: Span) {
+ let lhs_const = constant_full_int(cx, cx.typeck_results(), left);
+ let rhs_const = constant_full_int(cx, cx.typeck_results(), right);
+ if match (lhs_const, rhs_const) {
+ (Some(FullInt::S(lv)), Some(FullInt::S(rv))) => lv.abs() < rv.abs(),
+ (Some(FullInt::U(lv)), Some(FullInt::U(rv))) => lv < rv,
+ _ => return,
+ } {
+ span_ineffective_operation(cx, span, arg, Parens::Unneeded);
+ }
+}
+
+fn check_op(cx: &LateContext<'_>, e: &Expr<'_>, m: i8, span: Span, arg: Span, parens: Parens) {
+ if let Some(Constant::Int(v)) = constant_simple(cx, cx.typeck_results(), e).map(Constant::peel_refs) {
+ let check = match *cx.typeck_results().expr_ty(e).peel_refs().kind() {
+ ty::Int(ity) => unsext(cx.tcx, -1_i128, ity),
+ ty::Uint(uty) => clip(cx.tcx, !0, uty),
+ _ => return,
+ };
+ if match m {
+ 0 => v == 0,
+ -1 => v == check,
+ 1 => v == 1,
+ _ => unreachable!(),
+ } {
+ span_ineffective_operation(cx, span, arg, parens);
+ }
+ }
+}
+
+fn span_ineffective_operation(cx: &LateContext<'_>, span: Span, arg: Span, parens: Parens) {
+ let mut applicability = Applicability::MachineApplicable;
+ let expr_snippet = snippet_with_applicability(cx, arg, "..", &mut applicability);
+
+ let suggestion = match parens {
+ Parens::Needed => format!("({expr_snippet})"),
+ Parens::Unneeded => expr_snippet.into_owned(),
+ };
+
+ span_lint_and_sugg(
+ cx,
+ IDENTITY_OP,
+ span,
+ "this operation has no effect",
+ "consider reducing it to",
+ suggestion,
+ applicability,
+ );
+}
--- /dev/null
- ///
- /// ### Allowed types
- /// Custom allowed types can be specified through the "arithmetic-side-effects-allowed" filter.
+mod absurd_extreme_comparisons;
+mod assign_op_pattern;
+mod bit_mask;
+mod cmp_nan;
+mod cmp_owned;
+mod double_comparison;
+mod duration_subsec;
+mod eq_op;
+mod erasing_op;
+mod float_cmp;
+mod float_equality_without_abs;
+mod identity_op;
+mod integer_division;
+mod misrefactored_assign_op;
+mod modulo_arithmetic;
+mod modulo_one;
+mod needless_bitwise_bool;
+mod numeric_arithmetic;
+mod op_ref;
+mod ptr_eq;
+mod self_assignment;
+mod verbose_bit_mask;
+
+pub(crate) mod arithmetic_side_effects;
+
+use rustc_hir::{Body, Expr, ExprKind, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons where one side of the relation is
+ /// either the minimum or maximum value for its type and warns if it involves a
+ /// case that is always true or always false. Only integer and boolean types are
+ /// checked.
+ ///
+ /// ### Why is this bad?
+ /// An expression like `min <= x` may misleadingly imply
+ /// that it is possible for `x` to be less than the minimum. Expressions like
+ /// `max < x` are probably mistakes.
+ ///
+ /// ### Known problems
+ /// For `usize` the size of the current compile target will
+ /// be assumed (e.g., 64 bits on 64 bit systems). This means code that uses such
+ /// a comparison to detect target pointer width will trigger this lint. One can
+ /// use `mem::sizeof` and compare its value or conditional compilation
+ /// attributes
+ /// like `#[cfg(target_pointer_width = "64")] ..` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec: Vec<isize> = Vec::new();
+ /// if vec.len() <= 0 {}
+ /// if 100 > i32::MAX {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ABSURD_EXTREME_COMPARISONS,
+ correctness,
+ "a comparison with a maximum or minimum value that is always true or false"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks any kind of arithmetic operation of any type.
+ ///
+ /// Operators like `+`, `-`, `*` or `<<` are usually capable of overflowing according to the [Rust
+ /// Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow),
+ /// or can panic (`/`, `%`).
+ ///
+ /// Known safe built-in types like `Wrapping` or `Saturating`, floats, operations in constant
+ /// environments, allowed types and non-constant operations that won't overflow are ignored.
+ ///
+ /// ### Why is this bad?
+ /// For integers, overflow will trigger a panic in debug builds or wrap the result in
+ /// release mode; division by zero will cause a panic in either mode. As a result, it is
+ /// desirable to explicitly call checked, wrapping or saturating arithmetic methods.
+ ///
+ /// #### Example
+ /// ```rust
+ /// // `n` can be any number, including `i32::MAX`.
+ /// fn foo(n: i32) -> i32 {
+ /// n + 1
+ /// }
+ /// ```
+ ///
+ /// Third-party types can also overflow or present unwanted side-effects.
+ ///
+ /// #### Example
+ /// ```ignore,rust
+ /// use rust_decimal::Decimal;
+ /// let _n = Decimal::MAX + Decimal::MAX;
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub ARITHMETIC_SIDE_EFFECTS,
+ restriction,
+ "any arithmetic expression that can cause side effects like overflows or panics"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for integer arithmetic operations which could overflow or panic.
+ ///
+ /// Specifically, checks for any operators (`+`, `-`, `*`, `<<`, etc) which are capable
+ /// of overflowing according to the [Rust
+ /// Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow),
+ /// or which can panic (`/`, `%`). No bounds analysis or sophisticated reasoning is
+ /// attempted.
+ ///
+ /// ### Why is this bad?
+ /// Integer overflow will trigger a panic in debug builds or will wrap in
+ /// release mode. Division by zero will cause a panic in either mode. In some applications one
+ /// wants explicitly checked, wrapping or saturating arithmetic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 0;
+ /// a + 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INTEGER_ARITHMETIC,
+ restriction,
+ "any integer arithmetic expression which could overflow or panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for float arithmetic.
+ ///
+ /// ### Why is this bad?
+ /// For some embedded systems or kernel development, it
+ /// can be useful to rule out floating-point numbers.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 0.0;
+ /// a + 1.0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_ARITHMETIC,
+ restriction,
+ "any floating-point arithmetic statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `a = a op b` or `a = b commutative_op a`
+ /// patterns.
+ ///
+ /// ### Why is this bad?
+ /// These can be written as the shorter `a op= b`.
+ ///
+ /// ### Known problems
+ /// While forbidden by the spec, `OpAssign` traits may have
+ /// implementations that differ from the regular `Op` impl.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 0;
+ /// // ...
+ ///
+ /// a = a + b;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 0;
+ /// // ...
+ ///
+ /// a += b;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ASSIGN_OP_PATTERN,
+ style,
+ "assigning the result of an operation on a variable to that same variable"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `a op= a op b` or `a op= b op a` patterns.
+ ///
+ /// ### Why is this bad?
+ /// Most likely these are bugs where one meant to write `a
+ /// op= b`.
+ ///
+ /// ### Known problems
+ /// Clippy cannot know for sure if `a op= a op b` should have
+ /// been `a = a op a op b` or `a = a op b`/`a op= b`. Therefore, it suggests both.
+ /// If `a op= a op b` is really the correct behavior it should be
+ /// written as `a = a op a op b` as it's less confusing.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 2;
+ /// // ...
+ /// a += a + b;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MISREFACTORED_ASSIGN_OP,
+ suspicious,
+ "having a variable on both sides of an assign op"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for incompatible bit masks in comparisons.
+ ///
+ /// The formula for detecting if an expression of the type `_ <bit_op> m
+ /// <cmp_op> c` (where `<bit_op>` is one of {`&`, `|`} and `<cmp_op>` is one of
+ /// {`!=`, `>=`, `>`, `!=`, `>=`, `>`}) can be determined from the following
+ /// table:
+ ///
+ /// |Comparison |Bit Op|Example |is always|Formula |
+ /// |------------|------|-------------|---------|----------------------|
+ /// |`==` or `!=`| `&` |`x & 2 == 3` |`false` |`c & m != c` |
+ /// |`<` or `>=`| `&` |`x & 2 < 3` |`true` |`m < c` |
+ /// |`>` or `<=`| `&` |`x & 1 > 1` |`false` |`m <= c` |
+ /// |`==` or `!=`| `\|` |`x \| 1 == 0`|`false` |`c \| m != c` |
+ /// |`<` or `>=`| `\|` |`x \| 1 < 1` |`false` |`m >= c` |
+ /// |`<=` or `>` | `\|` |`x \| 1 > 0` |`true` |`m > c` |
+ ///
+ /// ### Why is this bad?
+ /// If the bits that the comparison cares about are always
+ /// set to zero or one by the bit mask, the comparison is constant `true` or
+ /// `false` (depending on mask, compared value, and operators).
+ ///
+ /// So the code is actively misleading, and the only reason someone would write
+ /// this intentionally is to win an underhanded Rust contest or create a
+ /// test-case for this lint.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if (x & 1 == 2) { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub BAD_BIT_MASK,
+ correctness,
+ "expressions of the form `_ & mask == select` that will only ever return `true` or `false`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bit masks in comparisons which can be removed
+ /// without changing the outcome. The basic structure can be seen in the
+ /// following table:
+ ///
+ /// |Comparison| Bit Op |Example |equals |
+ /// |----------|----------|------------|-------|
+ /// |`>` / `<=`|`\|` / `^`|`x \| 2 > 3`|`x > 3`|
+ /// |`<` / `>=`|`\|` / `^`|`x ^ 1 < 4` |`x < 4`|
+ ///
+ /// ### Why is this bad?
+ /// Not equally evil as [`bad_bit_mask`](#bad_bit_mask),
+ /// but still a bit misleading, because the bit mask is ineffective.
+ ///
+ /// ### Known problems
+ /// False negatives: This lint will only match instances
+ /// where we have figured out the math (which is for a power-of-two compared
+ /// value). This means things like `x | 1 >= 7` (which would be better written
+ /// as `x >= 6`) will not be reported (but bit masks like this are fairly
+ /// uncommon).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if (x | 1 > 3) { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INEFFECTIVE_BIT_MASK,
+ correctness,
+ "expressions where a bit mask will be rendered useless by a comparison, e.g., `(x | 1) > 2`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bit masks that can be replaced by a call
+ /// to `trailing_zeros`
+ ///
+ /// ### Why is this bad?
+ /// `x.trailing_zeros() > 4` is much clearer than `x & 15
+ /// == 0`
+ ///
+ /// ### Known problems
+ /// llvm generates better code for `x & 15 == 0` on x86
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if x & 0b1111 == 0 { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub VERBOSE_BIT_MASK,
+ pedantic,
+ "expressions where a bit mask is less readable than the corresponding method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for double comparisons that could be simplified to a single expression.
+ ///
+ ///
+ /// ### Why is this bad?
+ /// Readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// # let y = 2;
+ /// if x == y || x < y {}
+ /// ```
+ ///
+ /// Use instead:
+ ///
+ /// ```rust
+ /// # let x = 1;
+ /// # let y = 2;
+ /// if x <= y {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DOUBLE_COMPARISONS,
+ complexity,
+ "unnecessary double comparisons that can be simplified"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calculation of subsecond microseconds or milliseconds
+ /// from other `Duration` methods.
+ ///
+ /// ### Why is this bad?
+ /// It's more concise to call `Duration::subsec_micros()` or
+ /// `Duration::subsec_millis()` than to calculate them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::time::Duration;
+ /// # let duration = Duration::new(5, 0);
+ /// let micros = duration.subsec_nanos() / 1_000;
+ /// let millis = duration.subsec_nanos() / 1_000_000;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::time::Duration;
+ /// # let duration = Duration::new(5, 0);
+ /// let micros = duration.subsec_micros();
+ /// let millis = duration.subsec_millis();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DURATION_SUBSEC,
+ complexity,
+ "checks for calculation of subsecond microseconds or milliseconds"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for equal operands to comparison, logical and
+ /// bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
+ /// `||`, `&`, `|`, `^`, `-` and `/`).
+ ///
+ /// ### Why is this bad?
+ /// This is usually just a typo or a copy and paste error.
+ ///
+ /// ### Known problems
+ /// False negatives: We had some false positives regarding
+ /// calls (notably [racer](https://github.com/phildawes/racer) had one instance
+ /// of `x.pop() && x.pop()`), so we removed matching any function or method
+ /// calls. We may introduce a list of known pure functions in the future.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if x + 1 == x + 1 {}
+ ///
+ /// // or
+ ///
+ /// # let a = 3;
+ /// # let b = 4;
+ /// assert_eq!(a, a);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EQ_OP,
+ correctness,
+ "equal operands on both sides of a comparison or bitwise combination (e.g., `x == x`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arguments to `==` which have their address
+ /// taken to satisfy a bound
+ /// and suggests to dereference the other argument instead
+ ///
+ /// ### Why is this bad?
+ /// It is more idiomatic to dereference the other argument.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// &x == y
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// x == *y
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OP_REF,
+ style,
+ "taking a reference to satisfy the type constraints on `==`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for erasing operations, e.g., `x * 0`.
+ ///
+ /// ### Why is this bad?
+ /// The whole expression can be replaced by zero.
+ /// This is most likely not the intended outcome and should probably be
+ /// corrected
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 1;
+ /// 0 / x;
+ /// 0 * x;
+ /// x & 0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ERASING_OP,
+ correctness,
+ "using erasing operations, e.g., `x * 0` or `y & 0`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for statements of the form `(a - b) < f32::EPSILON` or
+ /// `(a - b) < f64::EPSILON`. Notes the missing `.abs()`.
+ ///
+ /// ### Why is this bad?
+ /// The code without `.abs()` is more likely to have a bug.
+ ///
+ /// ### Known problems
+ /// If the user can ensure that b is larger than a, the `.abs()` is
+ /// technically unnecessary. However, it will make the code more robust and doesn't have any
+ /// large performance implications. If the abs call was deliberately left out for performance
+ /// reasons, it is probably better to state this explicitly in the code, which then can be done
+ /// with an allow.
+ ///
+ /// ### Example
+ /// ```rust
+ /// pub fn is_roughly_equal(a: f32, b: f32) -> bool {
+ /// (a - b) < f32::EPSILON
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// pub fn is_roughly_equal(a: f32, b: f32) -> bool {
+ /// (a - b).abs() < f32::EPSILON
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub FLOAT_EQUALITY_WITHOUT_ABS,
+ suspicious,
+ "float equality check without `.abs()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for identity operations, e.g., `x + 0`.
+ ///
+ /// ### Why is this bad?
+ /// This code can be removed without changing the
+ /// meaning. So it just obscures what's going on. Delete it mercilessly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// x / 1 + 0 * 1 - 0 | 0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub IDENTITY_OP,
+ complexity,
+ "using identity operations, e.g., `x + 0` or `y / 1`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for division of integers
+ ///
+ /// ### Why is this bad?
+ /// When outside of some very specific algorithms,
+ /// integer division is very often a mistake because it discards the
+ /// remainder.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 3 / 2;
+ /// println!("{}", x);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = 3f32 / 2f32;
+ /// println!("{}", x);
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub INTEGER_DIVISION,
+ restriction,
+ "integer division may cause loss of precision"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons to NaN.
+ ///
+ /// ### Why is this bad?
+ /// NaN does not compare meaningfully to anything – not
+ /// even itself – so those comparisons are simply wrong.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1.0;
+ /// if x == f32::NAN { }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 1.0f32;
+ /// if x.is_nan() { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_NAN,
+ correctness,
+ "comparisons to `NAN`, which will always return false, probably not intended"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for conversions to owned values just for the sake
+ /// of a comparison.
+ ///
+ /// ### Why is this bad?
+ /// The comparison can operate on a reference, so creating
+ /// an owned value effectively throws it away directly afterwards, which is
+ /// needlessly consuming code and heap space.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = "foo";
+ /// # let y = String::from("foo");
+ /// if x.to_owned() == y {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = "foo";
+ /// # let y = String::from("foo");
+ /// if x == y {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_OWNED,
+ perf,
+ "creating owned instances for comparing with others, e.g., `x == \"foo\".to_string()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for (in-)equality comparisons on floating-point
+ /// values (apart from zero), except in functions called `*eq*` (which probably
+ /// implement equality for a type involving floats).
+ ///
+ /// ### Why is this bad?
+ /// Floating point calculations are usually imprecise, so
+ /// asking if two values are *exactly* equal is asking for trouble. For a good
+ /// guide on what to do, see [the floating point
+ /// guide](http://www.floating-point-gui.de/errors/comparison).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 1.2331f64;
+ /// let y = 1.2332f64;
+ ///
+ /// if y == 1.23f64 { }
+ /// if y != x {} // where both are floats
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 1.2331f64;
+ /// # let y = 1.2332f64;
+ /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
+ /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
+ /// // let error_margin = std::f64::EPSILON;
+ /// if (y - 1.23f64).abs() < error_margin { }
+ /// if (y - x).abs() > error_margin { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_CMP,
+ pedantic,
+ "using `==` or `!=` on float values instead of comparing difference with an epsilon"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for (in-)equality comparisons on floating-point
+ /// value and constant, except in functions called `*eq*` (which probably
+ /// implement equality for a type involving floats).
+ ///
+ /// ### Why is this bad?
+ /// Floating point calculations are usually imprecise, so
+ /// asking if two values are *exactly* equal is asking for trouble. For a good
+ /// guide on what to do, see [the floating point
+ /// guide](http://www.floating-point-gui.de/errors/comparison).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: f64 = 1.0;
+ /// const ONE: f64 = 1.00;
+ ///
+ /// if x == ONE { } // where both are floats
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x: f64 = 1.0;
+ /// # const ONE: f64 = 1.00;
+ /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
+ /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
+ /// // let error_margin = std::f64::EPSILON;
+ /// if (x - ONE).abs() < error_margin { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_CMP_CONST,
+ restriction,
+ "using `==` or `!=` on float constants instead of comparing difference with an epsilon"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for getting the remainder of a division by one or minus
+ /// one.
+ ///
+ /// ### Why is this bad?
+ /// The result for a divisor of one can only ever be zero; for
+ /// minus one it can cause panic/overflow (if the left operand is the minimal value of
+ /// the respective integer type) or results in zero. No one will write such code
+ /// deliberately, unless trying to win an Underhanded Rust Contest. Even for that
+ /// contest, it's probably a bad idea. Use something more underhanded.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// let a = x % 1;
+ /// let a = x % -1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MODULO_ONE,
+ correctness,
+ "taking a number modulo +/-1, which can either panic/overflow or always returns 0"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for modulo arithmetic.
+ ///
+ /// ### Why is this bad?
+ /// The results of modulo (%) operation might differ
+ /// depending on the language, when negative numbers are involved.
+ /// If you interop with different languages it might be beneficial
+ /// to double check all places that use modulo arithmetic.
+ ///
+ /// For example, in Rust `17 % -3 = 2`, but in Python `17 % -3 = -1`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = -17 % 3;
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub MODULO_ARITHMETIC,
+ restriction,
+ "any modulo arithmetic statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for uses of bitwise and/or operators between booleans, where performance may be improved by using
+ /// a lazy and.
+ ///
+ /// ### Why is this bad?
+ /// The bitwise operators do not support short-circuiting, so it may hinder code performance.
+ /// Additionally, boolean logic "masked" as bitwise logic is not caught by lints like `unnecessary_fold`
+ ///
+ /// ### Known problems
+ /// This lint evaluates only when the right side is determined to have no side effects. At this time, that
+ /// determination is quite conservative.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let (x,y) = (true, false);
+ /// if x & !y {} // where both x and y are booleans
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let (x,y) = (true, false);
+ /// if x && !y {}
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub NEEDLESS_BITWISE_BOOL,
+ pedantic,
+ "Boolean expressions that use bitwise rather than lazy operators"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Use `std::ptr::eq` when applicable
+ ///
+ /// ### Why is this bad?
+ /// `ptr::eq` can be used to compare `&T` references
+ /// (which coerce to `*const T` implicitly) by their address rather than
+ /// comparing the values they point to.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = &[1, 2, 3];
+ /// let b = &[1, 2, 3];
+ ///
+ /// assert!(a as *const _ as usize == b as *const _ as usize);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let a = &[1, 2, 3];
+ /// let b = &[1, 2, 3];
+ ///
+ /// assert!(std::ptr::eq(a, b));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub PTR_EQ,
+ style,
+ "use `std::ptr::eq` when comparing raw pointers"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit self-assignments.
+ ///
+ /// ### Why is this bad?
+ /// Self-assignments are redundant and unlikely to be
+ /// intentional.
+ ///
+ /// ### Known problems
+ /// If expression contains any deref coercions or
+ /// indexing operations they are assumed not to have any side effects.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Event {
+ /// x: i32,
+ /// }
+ ///
+ /// fn copy_position(a: &mut Event, b: &Event) {
+ /// a.x = a.x;
+ /// }
+ /// ```
+ ///
+ /// Should be:
+ /// ```rust
+ /// struct Event {
+ /// x: i32,
+ /// }
+ ///
+ /// fn copy_position(a: &mut Event, b: &Event) {
+ /// a.x = b.x;
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub SELF_ASSIGNMENT,
+ correctness,
+ "explicit self-assignment"
+}
+
+pub struct Operators {
+ arithmetic_context: numeric_arithmetic::Context,
+ verbose_bit_mask_threshold: u64,
+}
+impl_lint_pass!(Operators => [
+ ABSURD_EXTREME_COMPARISONS,
+ ARITHMETIC_SIDE_EFFECTS,
+ INTEGER_ARITHMETIC,
+ FLOAT_ARITHMETIC,
+ ASSIGN_OP_PATTERN,
+ MISREFACTORED_ASSIGN_OP,
+ BAD_BIT_MASK,
+ INEFFECTIVE_BIT_MASK,
+ VERBOSE_BIT_MASK,
+ DOUBLE_COMPARISONS,
+ DURATION_SUBSEC,
+ EQ_OP,
+ OP_REF,
+ ERASING_OP,
+ FLOAT_EQUALITY_WITHOUT_ABS,
+ IDENTITY_OP,
+ INTEGER_DIVISION,
+ CMP_NAN,
+ CMP_OWNED,
+ FLOAT_CMP,
+ FLOAT_CMP_CONST,
+ MODULO_ONE,
+ MODULO_ARITHMETIC,
+ NEEDLESS_BITWISE_BOOL,
+ PTR_EQ,
+ SELF_ASSIGNMENT,
+]);
+impl Operators {
+ pub fn new(verbose_bit_mask_threshold: u64) -> Self {
+ Self {
+ arithmetic_context: numeric_arithmetic::Context::default(),
+ verbose_bit_mask_threshold,
+ }
+ }
+}
+impl<'tcx> LateLintPass<'tcx> for Operators {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ eq_op::check_assert(cx, e);
+ match e.kind {
+ ExprKind::Binary(op, lhs, rhs) => {
+ if !e.span.from_expansion() {
+ absurd_extreme_comparisons::check(cx, e, op.node, lhs, rhs);
+ if !(macro_with_not_op(lhs) || macro_with_not_op(rhs)) {
+ eq_op::check(cx, e, op.node, lhs, rhs);
+ op_ref::check(cx, e, op.node, lhs, rhs);
+ }
+ erasing_op::check(cx, e, op.node, lhs, rhs);
+ identity_op::check(cx, e, op.node, lhs, rhs);
+ needless_bitwise_bool::check(cx, e, op.node, lhs, rhs);
+ ptr_eq::check(cx, e, op.node, lhs, rhs);
+ }
+ self.arithmetic_context.check_binary(cx, e, op.node, lhs, rhs);
+ bit_mask::check(cx, e, op.node, lhs, rhs);
+ verbose_bit_mask::check(cx, e, op.node, lhs, rhs, self.verbose_bit_mask_threshold);
+ double_comparison::check(cx, op.node, lhs, rhs, e.span);
+ duration_subsec::check(cx, e, op.node, lhs, rhs);
+ float_equality_without_abs::check(cx, e, op.node, lhs, rhs);
+ integer_division::check(cx, e, op.node, lhs, rhs);
+ cmp_nan::check(cx, e, op.node, lhs, rhs);
+ cmp_owned::check(cx, op.node, lhs, rhs);
+ float_cmp::check(cx, e, op.node, lhs, rhs);
+ modulo_one::check(cx, e, op.node, rhs);
+ modulo_arithmetic::check(cx, e, op.node, lhs, rhs);
+ },
+ ExprKind::AssignOp(op, lhs, rhs) => {
+ self.arithmetic_context.check_binary(cx, e, op.node, lhs, rhs);
+ misrefactored_assign_op::check(cx, e, op.node, lhs, rhs);
+ modulo_arithmetic::check(cx, e, op.node, lhs, rhs);
+ },
+ ExprKind::Assign(lhs, rhs, _) => {
+ assign_op_pattern::check(cx, e, lhs, rhs);
+ self_assignment::check(cx, e, lhs, rhs);
+ },
+ ExprKind::Unary(op, arg) => {
+ if op == UnOp::Neg {
+ self.arithmetic_context.check_negate(cx, e, arg);
+ }
+ },
+ _ => (),
+ }
+ }
+
+ fn check_expr_post(&mut self, _: &LateContext<'_>, e: &Expr<'_>) {
+ self.arithmetic_context.expr_post(e.hir_id);
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'tcx>, b: &'tcx Body<'_>) {
+ self.arithmetic_context.enter_body(cx, b);
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'tcx>, b: &'tcx Body<'_>) {
+ self.arithmetic_context.body_post(cx, b);
+ }
+}
+
+fn macro_with_not_op(e: &Expr<'_>) -> bool {
+ if let ExprKind::Unary(_, e) = e.kind {
+ e.span.from_expansion()
+ } else {
+ false
+ }
+}
--- /dev/null
- if path.res.iter().all(|res| matches!(res, Res::Def(DefKind::Macro(MacroKind::Bang), _))) {
+use clippy_utils::diagnostics::span_lint_and_then;
+use rustc_errors::Applicability;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::{Item, ItemKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::def_id::CRATE_DEF_ID;
+use rustc_span::hygiene::MacroKind;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for items declared `pub(crate)` that are not crate visible because they
+ /// are inside a private module.
+ ///
+ /// ### Why is this bad?
+ /// Writing `pub(crate)` is misleading when it's redundant due to the parent
+ /// module's visibility.
+ ///
+ /// ### Example
+ /// ```rust
+ /// mod internal {
+ /// pub(crate) fn internal_fn() { }
+ /// }
+ /// ```
+ /// This function is not visible outside the module and it can be declared with `pub` or
+ /// private visibility
+ /// ```rust
+ /// mod internal {
+ /// pub fn internal_fn() { }
+ /// }
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub REDUNDANT_PUB_CRATE,
+ nursery,
+ "Using `pub(crate)` visibility on items that are not crate visible due to the visibility of the module that contains them."
+}
+
+#[derive(Default)]
+pub struct RedundantPubCrate {
+ is_exported: Vec<bool>,
+}
+
+impl_lint_pass!(RedundantPubCrate => [REDUNDANT_PUB_CRATE]);
+
+impl<'tcx> LateLintPass<'tcx> for RedundantPubCrate {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
+ if_chain! {
+ if cx.tcx.visibility(item.owner_id.def_id) == ty::Visibility::Restricted(CRATE_DEF_ID.to_def_id());
+ if !cx.effective_visibilities.is_exported(item.owner_id.def_id) && self.is_exported.last() == Some(&false);
+ if is_not_macro_export(item);
+ then {
+ let span = item.span.with_hi(item.ident.span.hi());
+ let descr = cx.tcx.def_kind(item.owner_id).descr(item.owner_id.to_def_id());
+ span_lint_and_then(
+ cx,
+ REDUNDANT_PUB_CRATE,
+ span,
+ &format!("pub(crate) {descr} inside private module"),
+ |diag| {
+ diag.span_suggestion(
+ item.vis_span,
+ "consider using",
+ "pub".to_string(),
+ Applicability::MachineApplicable,
+ );
+ },
+ );
+ }
+ }
+
+ if let ItemKind::Mod { .. } = item.kind {
+ self.is_exported
+ .push(cx.effective_visibilities.is_exported(item.owner_id.def_id));
+ }
+ }
+
+ fn check_item_post(&mut self, _cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
+ if let ItemKind::Mod { .. } = item.kind {
+ self.is_exported.pop().expect("unbalanced check_item/check_item_post");
+ }
+ }
+}
+
+fn is_not_macro_export<'tcx>(item: &'tcx Item<'tcx>) -> bool {
+ if let ItemKind::Use(path, _) = item.kind {
++ if path
++ .res
++ .iter()
++ .all(|res| matches!(res, Res::Def(DefKind::Macro(MacroKind::Bang), _)))
++ {
+ return false;
+ }
+ } else if let ItemKind::Macro(..) = item.kind {
+ return false;
+ }
+
+ true
+}
--- /dev/null
- let sugg = format!("&{snip}");
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::source::snippet;
+use rustc_ast::ast::{Item, ItemKind, Ty, TyKind};
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for constants and statics with an explicit `'static` lifetime.
+ ///
+ /// ### Why is this bad?
+ /// Adding `'static` to every reference can create very
+ /// complicated types.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// const FOO: &'static [(&'static str, &'static str, fn(&Bar) -> bool)] =
+ /// &[...]
+ /// static FOO: &'static [(&'static str, &'static str, fn(&Bar) -> bool)] =
+ /// &[...]
+ /// ```
+ /// This code can be rewritten as
+ /// ```ignore
+ /// const FOO: &[(&str, &str, fn(&Bar) -> bool)] = &[...]
+ /// static FOO: &[(&str, &str, fn(&Bar) -> bool)] = &[...]
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub REDUNDANT_STATIC_LIFETIMES,
+ style,
+ "Using explicit `'static` lifetime for constants or statics when elision rules would allow omitting them."
+}
+
+pub struct RedundantStaticLifetimes {
+ msrv: Msrv,
+}
+
+impl RedundantStaticLifetimes {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(RedundantStaticLifetimes => [REDUNDANT_STATIC_LIFETIMES]);
+
+impl RedundantStaticLifetimes {
+ // Recursively visit types
+ fn visit_type(ty: &Ty, cx: &EarlyContext<'_>, reason: &str) {
+ match ty.kind {
+ // Be careful of nested structures (arrays and tuples)
+ TyKind::Array(ref ty, _) | TyKind::Slice(ref ty) => {
+ Self::visit_type(ty, cx, reason);
+ },
+ TyKind::Tup(ref tup) => {
+ for tup_ty in tup {
+ Self::visit_type(tup_ty, cx, reason);
+ }
+ },
+ // This is what we are looking for !
+ TyKind::Rptr(ref optional_lifetime, ref borrow_type) => {
+ // Match the 'static lifetime
+ if let Some(lifetime) = *optional_lifetime {
+ match borrow_type.ty.kind {
+ TyKind::Path(..) | TyKind::Slice(..) | TyKind::Array(..) | TyKind::Tup(..) => {
+ if lifetime.ident.name == rustc_span::symbol::kw::StaticLifetime {
+ let snip = snippet(cx, borrow_type.ty.span, "<type>");
++ let sugg = format!("&{}{snip}", borrow_type.mutbl.prefix_str());
+ span_lint_and_then(
+ cx,
+ REDUNDANT_STATIC_LIFETIMES,
+ lifetime.ident.span,
+ reason,
+ |diag| {
+ diag.span_suggestion(
+ ty.span,
+ "consider removing `'static`",
+ sugg,
+ Applicability::MachineApplicable, //snippet
+ );
+ },
+ );
+ }
+ },
+ _ => {},
+ }
+ }
+ Self::visit_type(&borrow_type.ty, cx, reason);
+ },
+ _ => {},
+ }
+ }
+}
+
+impl EarlyLintPass for RedundantStaticLifetimes {
+ fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
+ if !self.msrv.meets(msrvs::STATIC_IN_CONST) {
+ return;
+ }
+
+ if !item.span.from_expansion() {
+ if let ItemKind::Const(_, ref var_type, _) = item.kind {
+ Self::visit_type(var_type, cx, "constants have by default a `'static` lifetime");
+ // Don't check associated consts because `'static` cannot be elided on those (issue
+ // #2438)
+ }
+
+ if let ItemKind::Static(ref var_type, _, _) = item.kind {
+ Self::visit_type(var_type, cx, "statics have by default a `'static` lifetime");
+ }
+ }
+ }
+
+ extract_msrv_attr!(EarlyContext);
+}
--- /dev/null
+// This file is managed by `cargo dev rename_lint`. Prefer using that when possible.
+
+#[rustfmt::skip]
+pub static RENAMED_LINTS: &[(&str, &str)] = &[
++ ("clippy::almost_complete_letter_range", "clippy::almost_complete_range"),
+ ("clippy::blacklisted_name", "clippy::disallowed_names"),
+ ("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions"),
+ ("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions"),
+ ("clippy::box_vec", "clippy::box_collection"),
+ ("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes"),
+ ("clippy::cyclomatic_complexity", "clippy::cognitive_complexity"),
+ ("clippy::disallowed_method", "clippy::disallowed_methods"),
+ ("clippy::disallowed_type", "clippy::disallowed_types"),
+ ("clippy::eval_order_dependence", "clippy::mixed_read_write_in_expression"),
+ ("clippy::identity_conversion", "clippy::useless_conversion"),
+ ("clippy::if_let_some_result", "clippy::match_result_ok"),
+ ("clippy::logic_bug", "clippy::overly_complex_bool_expr"),
+ ("clippy::new_without_default_derive", "clippy::new_without_default"),
+ ("clippy::option_and_then_some", "clippy::bind_instead_of_map"),
+ ("clippy::option_expect_used", "clippy::expect_used"),
+ ("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"),
+ ("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or"),
+ ("clippy::option_unwrap_used", "clippy::unwrap_used"),
+ ("clippy::ref_in_deref", "clippy::needless_borrow"),
+ ("clippy::result_expect_used", "clippy::expect_used"),
+ ("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or"),
+ ("clippy::result_unwrap_used", "clippy::unwrap_used"),
+ ("clippy::single_char_push_str", "clippy::single_char_add_str"),
+ ("clippy::stutter", "clippy::module_name_repetitions"),
+ ("clippy::to_string_in_display", "clippy::recursive_format_impl"),
+ ("clippy::zero_width_space", "clippy::invisible_characters"),
+ ("clippy::drop_bounds", "drop_bounds"),
+ ("clippy::for_loop_over_option", "for_loops_over_fallibles"),
+ ("clippy::for_loop_over_result", "for_loops_over_fallibles"),
+ ("clippy::for_loops_over_fallibles", "for_loops_over_fallibles"),
+ ("clippy::into_iter_on_array", "array_into_iter"),
+ ("clippy::invalid_atomic_ordering", "invalid_atomic_ordering"),
+ ("clippy::invalid_ref", "invalid_value"),
+ ("clippy::let_underscore_drop", "let_underscore_drop"),
+ ("clippy::mem_discriminant_non_enum", "enum_intrinsics_non_enums"),
+ ("clippy::panic_params", "non_fmt_panics"),
+ ("clippy::positional_named_format_parameters", "named_arguments_used_positionally"),
+ ("clippy::temporary_cstring_as_ptr", "temporary_cstring_as_ptr"),
+ ("clippy::unknown_clippy_lints", "unknown_lints"),
+ ("clippy::unused_label", "unused_labels"),
+];
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::{multispan_sugg_with_applicability, span_lint_and_then};
++use rustc_errors::Applicability;
++use rustc_hir::{Block, Expr, ExprKind, Stmt, StmtKind};
++use rustc_lint::{LateContext, LateLintPass, LintContext};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::Span;
++
++declare_clippy_lint! {
++ /// ### What it does
++ ///
++ /// Suggests moving the semicolon after a block to the inside of the block, after its last
++ /// expression.
++ ///
++ /// ### Why is this bad?
++ ///
++ /// For consistency it's best to have the semicolon inside/outside the block. Either way is fine
++ /// and this lint suggests inside the block.
++ /// Take a look at `semicolon_outside_block` for the other alternative.
++ ///
++ /// ### Example
++ ///
++ /// ```rust
++ /// # fn f(_: u32) {}
++ /// # let x = 0;
++ /// unsafe { f(x) };
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// # fn f(_: u32) {}
++ /// # let x = 0;
++ /// unsafe { f(x); }
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub SEMICOLON_INSIDE_BLOCK,
++ restriction,
++ "add a semicolon inside the block"
++}
++declare_clippy_lint! {
++ /// ### What it does
++ ///
++ /// Suggests moving the semicolon from a block's final expression outside of the block.
++ ///
++ /// ### Why is this bad?
++ ///
++ /// For consistency it's best to have the semicolon inside/outside the block. Either way is fine
++ /// and this lint suggests outside the block.
++ /// Take a look at `semicolon_inside_block` for the other alternative.
++ ///
++ /// ### Example
++ ///
++ /// ```rust
++ /// # fn f(_: u32) {}
++ /// # let x = 0;
++ /// unsafe { f(x); }
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// # fn f(_: u32) {}
++ /// # let x = 0;
++ /// unsafe { f(x) };
++ /// ```
++ #[clippy::version = "1.66.0"]
++ pub SEMICOLON_OUTSIDE_BLOCK,
++ restriction,
++ "add a semicolon outside the block"
++}
++declare_lint_pass!(SemicolonBlock => [SEMICOLON_INSIDE_BLOCK, SEMICOLON_OUTSIDE_BLOCK]);
++
++impl LateLintPass<'_> for SemicolonBlock {
++ fn check_stmt(&mut self, cx: &LateContext<'_>, stmt: &Stmt<'_>) {
++ match stmt.kind {
++ StmtKind::Expr(Expr {
++ kind: ExprKind::Block(block, _),
++ ..
++ }) if !block.span.from_expansion() => {
++ let Block {
++ expr: None,
++ stmts: [.., stmt],
++ ..
++ } = block else { return };
++ let &Stmt {
++ kind: StmtKind::Semi(expr),
++ span,
++ ..
++ } = stmt else { return };
++ semicolon_outside_block(cx, block, expr, span);
++ },
++ StmtKind::Semi(Expr {
++ kind: ExprKind::Block(block @ Block { expr: Some(tail), .. }, _),
++ ..
++ }) if !block.span.from_expansion() => semicolon_inside_block(cx, block, tail, stmt.span),
++ _ => (),
++ }
++ }
++}
++
++fn semicolon_inside_block(cx: &LateContext<'_>, block: &Block<'_>, tail: &Expr<'_>, semi_span: Span) {
++ let insert_span = tail.span.source_callsite().shrink_to_hi();
++ let remove_span = semi_span.with_lo(block.span.hi());
++
++ span_lint_and_then(
++ cx,
++ SEMICOLON_INSIDE_BLOCK,
++ semi_span,
++ "consider moving the `;` inside the block for consistent formatting",
++ |diag| {
++ multispan_sugg_with_applicability(
++ diag,
++ "put the `;` here",
++ Applicability::MachineApplicable,
++ [(remove_span, String::new()), (insert_span, ";".to_owned())],
++ );
++ },
++ );
++}
++
++fn semicolon_outside_block(cx: &LateContext<'_>, block: &Block<'_>, tail_stmt_expr: &Expr<'_>, semi_span: Span) {
++ let insert_span = block.span.with_lo(block.span.hi());
++ // account for macro calls
++ let semi_span = cx.sess().source_map().stmt_span(semi_span, block.span);
++ let remove_span = semi_span.with_lo(tail_stmt_expr.span.source_callsite().hi());
++
++ span_lint_and_then(
++ cx,
++ SEMICOLON_OUTSIDE_BLOCK,
++ block.span,
++ "consider moving the `;` outside the block for consistent formatting",
++ |diag| {
++ multispan_sugg_with_applicability(
++ diag,
++ "put the `;` here",
++ Applicability::MachineApplicable,
++ [(remove_span, String::new()), (insert_span, ";".to_owned())],
++ );
++ },
++ );
++}
--- /dev/null
- use clippy_utils::{peel_blocks, SpanlessEq};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg};
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::ty::is_type_lang_item;
++use clippy_utils::{get_expr_use_or_unification_node, peel_blocks, SpanlessEq};
+use clippy_utils::{get_parent_expr, is_lint_allowed, match_function_call, method_calls, paths};
- use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, LangItem, QPath};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
- span_lint_and_sugg(
- cx,
- STRING_LIT_AS_BYTES,
- e.span,
- "calling `as_bytes()` on a string literal",
- "consider using a byte string literal instead",
- format!(
- "b{}",
- snippet_with_applicability(cx, receiver.span, r#""foo""#, &mut applicability)
- ),
- applicability,
- );
++use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, LangItem, Node, QPath};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Spanned;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for string appends of the form `x = x + y` (without
+ /// `let`!).
+ ///
+ /// ### Why is this bad?
+ /// It's not really bad, but some people think that the
+ /// `.push_str(_)` method is more readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut x = "Hello".to_owned();
+ /// x = x + ", World";
+ ///
+ /// // More readable
+ /// x += ", World";
+ /// x.push_str(", World");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_ADD_ASSIGN,
+ pedantic,
+ "using `x = x + ..` where x is a `String` instead of `push_str()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for all instances of `x + _` where `x` is of type
+ /// `String`, but only if [`string_add_assign`](#string_add_assign) does *not*
+ /// match.
+ ///
+ /// ### Why is this bad?
+ /// It's not bad in and of itself. However, this particular
+ /// `Add` implementation is asymmetric (the other operand need not be `String`,
+ /// but `x` does), while addition as mathematically defined is symmetric, also
+ /// the `String::push_str(_)` function is a perfectly good replacement.
+ /// Therefore, some dislike it and wish not to have it in their code.
+ ///
+ /// That said, other people think that string addition, having a long tradition
+ /// in other languages is actually fine, which is why we decided to make this
+ /// particular lint `allow` by default.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = "Hello".to_owned();
+ /// x + ", World";
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut x = "Hello".to_owned();
+ /// x.push_str(", World");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_ADD,
+ restriction,
+ "using `x + ..` where x is a `String` instead of `push_str()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the `as_bytes` method called on string literals
+ /// that contain only ASCII characters.
+ ///
+ /// ### Why is this bad?
+ /// Byte string literals (e.g., `b"foo"`) can be used
+ /// instead. They are shorter but less discoverable than `as_bytes()`.
+ ///
+ /// ### Known problems
+ /// `"str".as_bytes()` and the suggested replacement of `b"str"` are not
+ /// equivalent because they have different types. The former is `&[u8]`
+ /// while the latter is `&[u8; 3]`. That means in general they will have a
+ /// different set of methods and different trait implementations.
+ ///
+ /// ```compile_fail
+ /// fn f(v: Vec<u8>) {}
+ ///
+ /// f("...".as_bytes().to_owned()); // works
+ /// f(b"...".to_owned()); // does not work, because arg is [u8; 3] not Vec<u8>
+ ///
+ /// fn g(r: impl std::io::Read) {}
+ ///
+ /// g("...".as_bytes()); // works
+ /// g(b"..."); // does not work
+ /// ```
+ ///
+ /// The actual equivalent of `"str".as_bytes()` with the same type is not
+ /// `b"str"` but `&b"str"[..]`, which is a great deal of punctuation and not
+ /// more readable than a function call.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let bstr = "a byte string".as_bytes();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let bstr = b"a byte string";
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_LIT_AS_BYTES,
+ nursery,
+ "calling `as_bytes` on a string literal instead of using a byte string literal"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for slice operations on strings
+ ///
+ /// ### Why is this bad?
+ /// UTF-8 characters span multiple bytes, and it is easy to inadvertently confuse character
+ /// counts and string indices. This may lead to panics, and should warrant some test cases
+ /// containing wide UTF-8 characters. This lint is most useful in code that should avoid
+ /// panics at all costs.
+ ///
+ /// ### Known problems
+ /// Probably lots of false positives. If an index comes from a known valid position (e.g.
+ /// obtained via `char_indices` over the same string), it is totally OK.
+ ///
+ /// # Example
+ /// ```rust,should_panic
+ /// &"Ölkanne"[1..];
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub STRING_SLICE,
+ restriction,
+ "slicing a string"
+}
+
+declare_lint_pass!(StringAdd => [STRING_ADD, STRING_ADD_ASSIGN, STRING_SLICE]);
+
+impl<'tcx> LateLintPass<'tcx> for StringAdd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if in_external_macro(cx.sess(), e.span) {
+ return;
+ }
+ match e.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ left,
+ _,
+ ) => {
+ if is_string(cx, left) {
+ if !is_lint_allowed(cx, STRING_ADD_ASSIGN, e.hir_id) {
+ let parent = get_parent_expr(cx, e);
+ if let Some(p) = parent {
+ if let ExprKind::Assign(target, _, _) = p.kind {
+ // avoid duplicate matches
+ if SpanlessEq::new(cx).eq_expr(target, left) {
+ return;
+ }
+ }
+ }
+ }
+ span_lint(
+ cx,
+ STRING_ADD,
+ e.span,
+ "you added something to a string. Consider using `String::push_str()` instead",
+ );
+ }
+ },
+ ExprKind::Assign(target, src, _) => {
+ if is_string(cx, target) && is_add(cx, src, target) {
+ span_lint(
+ cx,
+ STRING_ADD_ASSIGN,
+ e.span,
+ "you assigned the result of adding something to this string. Consider using \
+ `String::push_str()` instead",
+ );
+ }
+ },
+ ExprKind::Index(target, _idx) => {
+ let e_ty = cx.typeck_results().expr_ty(target).peel_refs();
+ if matches!(e_ty.kind(), ty::Str) || is_type_lang_item(cx, e_ty, LangItem::String) {
+ span_lint(
+ cx,
+ STRING_SLICE,
+ e.span,
+ "indexing into a string may panic if the index is within a UTF-8 character",
+ );
+ }
+ },
+ _ => {},
+ }
+ }
+}
+
+fn is_string(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ is_type_lang_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), LangItem::String)
+}
+
+fn is_add(cx: &LateContext<'_>, src: &Expr<'_>, target: &Expr<'_>) -> bool {
+ match peel_blocks(src).kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ left,
+ _,
+ ) => SpanlessEq::new(cx).eq_expr(target, left),
+ _ => false,
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check if the string is transformed to byte array and casted back to string.
+ ///
+ /// ### Why is this bad?
+ /// It's unnecessary, the string can be used directly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// std::str::from_utf8(&"Hello World!".as_bytes()[6..11]).unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// &"Hello World!"[6..11];
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub STRING_FROM_UTF8_AS_BYTES,
+ complexity,
+ "casting string slices to byte slices and back"
+}
+
+// Max length a b"foo" string can take
+const MAX_LENGTH_BYTE_STRING_LIT: usize = 32;
+
+declare_lint_pass!(StringLitAsBytes => [STRING_LIT_AS_BYTES, STRING_FROM_UTF8_AS_BYTES]);
+
+impl<'tcx> LateLintPass<'tcx> for StringLitAsBytes {
++ #[expect(clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ use rustc_ast::LitKind;
+
+ if_chain! {
+ // Find std::str::converts::from_utf8
+ if let Some(args) = match_function_call(cx, e, &paths::STR_FROM_UTF8);
+
+ // Find string::as_bytes
+ if let ExprKind::AddrOf(BorrowKind::Ref, _, args) = args[0].kind;
+ if let ExprKind::Index(left, right) = args.kind;
+ let (method_names, expressions, _) = method_calls(left, 1);
+ if method_names.len() == 1;
+ if expressions.len() == 1;
+ if expressions[0].1.is_empty();
+ if method_names[0] == sym!(as_bytes);
+
+ // Check for slicer
+ if let ExprKind::Struct(QPath::LangItem(LangItem::Range, ..), _, _) = right.kind;
+
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let string_expression = &expressions[0].0;
+
+ let snippet_app = snippet_with_applicability(
+ cx,
+ string_expression.span, "..",
+ &mut applicability,
+ );
+
+ span_lint_and_sugg(
+ cx,
+ STRING_FROM_UTF8_AS_BYTES,
+ e.span,
+ "calling a slice of `as_bytes()` with `from_utf8` should be not necessary",
+ "try",
+ format!("Some(&{snippet_app}[{}])", snippet(cx, right.span, "..")),
+ applicability
+ )
+ }
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, receiver, ..) = &e.kind;
+ if path.ident.name == sym!(as_bytes);
+ if let ExprKind::Lit(lit) = &receiver.kind;
+ if let LitKind::Str(lit_content, _) = &lit.node;
+ then {
+ let callsite = snippet(cx, receiver.span.source_callsite(), r#""foo""#);
+ let mut applicability = Applicability::MachineApplicable;
+ if callsite.starts_with("include_str!") {
+ span_lint_and_sugg(
+ cx,
+ STRING_LIT_AS_BYTES,
+ e.span,
+ "calling `as_bytes()` on `include_str!(..)`",
+ "consider using `include_bytes!(..)` instead",
+ snippet_with_applicability(cx, receiver.span, r#""foo""#, &mut applicability).replacen(
+ "include_str",
+ "include_bytes",
+ 1,
+ ),
+ applicability,
+ );
+ } else if lit_content.as_str().is_ascii()
+ && lit_content.as_str().len() <= MAX_LENGTH_BYTE_STRING_LIT
+ && !receiver.span.from_expansion()
+ {
++ if let Some((parent, id)) = get_expr_use_or_unification_node(cx.tcx, e)
++ && let Node::Expr(parent) = parent
++ && let ExprKind::Match(scrutinee, ..) = parent.kind
++ && scrutinee.hir_id == id
++ {
++ // Don't lint. Byte strings produce `&[u8; N]` whereas `as_bytes()` produces
++ // `&[u8]`. This change would prevent matching with different sized slices.
++ } else {
++ span_lint_and_sugg(
++ cx,
++ STRING_LIT_AS_BYTES,
++ e.span,
++ "calling `as_bytes()` on a string literal",
++ "consider using a byte string literal instead",
++ format!(
++ "b{}",
++ snippet_with_applicability(cx, receiver.span, r#""foo""#, &mut applicability)
++ ),
++ applicability,
++ );
++ }
+ }
+ }
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, recv, [], _) = &e.kind;
+ if path.ident.name == sym!(into_bytes);
+ if let ExprKind::MethodCall(path, recv, [], _) = &recv.kind;
+ if matches!(path.ident.name.as_str(), "to_owned" | "to_string");
+ if let ExprKind::Lit(lit) = &recv.kind;
+ if let LitKind::Str(lit_content, _) = &lit.node;
+
+ if lit_content.as_str().is_ascii();
+ if lit_content.as_str().len() <= MAX_LENGTH_BYTE_STRING_LIT;
+ if !recv.span.from_expansion();
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+
+ span_lint_and_sugg(
+ cx,
+ STRING_LIT_AS_BYTES,
+ e.span,
+ "calling `into_bytes()` on a string literal",
+ "consider using a byte string literal instead",
+ format!(
+ "b{}.to_vec()",
+ snippet_with_applicability(cx, recv.span, r#""..""#, &mut applicability)
+ ),
+ applicability,
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for `.to_string()` method calls on values of type `&str`.
+ ///
+ /// ### Why is this bad?
+ /// The `to_string` method is also used on other types to convert them to a string.
+ /// When called on a `&str` it turns the `&str` into the owned variant `String`, which can be better
+ /// expressed with `.to_owned()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let _ = "str".to_string();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// // example code which does not raise clippy warning
+ /// let _ = "str".to_owned();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STR_TO_STRING,
+ restriction,
+ "using `to_string()` on a `&str`, which should be `to_owned()`"
+}
+
+declare_lint_pass!(StrToString => [STR_TO_STRING]);
+
+impl<'tcx> LateLintPass<'tcx> for StrToString {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ if_chain! {
+ if let ExprKind::MethodCall(path, self_arg, ..) = &expr.kind;
+ if path.ident.name == sym::to_string;
+ let ty = cx.typeck_results().expr_ty(self_arg);
+ if let ty::Ref(_, ty, ..) = ty.kind();
+ if *ty.kind() == ty::Str;
+ then {
+ span_lint_and_help(
+ cx,
+ STR_TO_STRING,
+ expr.span,
+ "`to_string()` called on a `&str`",
+ None,
+ "consider using `.to_owned()`",
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for `.to_string()` method calls on values of type `String`.
+ ///
+ /// ### Why is this bad?
+ /// The `to_string` method is also used on other types to convert them to a string.
+ /// When called on a `String` it only clones the `String`, which can be better expressed with `.clone()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let msg = String::from("Hello World");
+ /// let _ = msg.to_string();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// // example code which does not raise clippy warning
+ /// let msg = String::from("Hello World");
+ /// let _ = msg.clone();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_TO_STRING,
+ restriction,
+ "using `to_string()` on a `String`, which should be `clone()`"
+}
+
+declare_lint_pass!(StringToString => [STRING_TO_STRING]);
+
+impl<'tcx> LateLintPass<'tcx> for StringToString {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ if_chain! {
+ if let ExprKind::MethodCall(path, self_arg, ..) = &expr.kind;
+ if path.ident.name == sym::to_string;
+ let ty = cx.typeck_results().expr_ty(self_arg);
+ if is_type_lang_item(cx, ty, LangItem::String);
+ then {
+ span_lint_and_help(
+ cx,
+ STRING_TO_STRING,
+ expr.span,
+ "`to_string()` called on a `String`",
+ None,
+ "consider using `.clone()`",
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns about calling `str::trim` (or variants) before `str::split_whitespace`.
+ ///
+ /// ### Why is this bad?
+ /// `split_whitespace` already ignores leading and trailing whitespace.
+ ///
+ /// ### Example
+ /// ```rust
+ /// " A B C ".trim().split_whitespace();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// " A B C ".split_whitespace();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub TRIM_SPLIT_WHITESPACE,
+ style,
+ "using `str::trim()` or alike before `str::split_whitespace`"
+}
+declare_lint_pass!(TrimSplitWhitespace => [TRIM_SPLIT_WHITESPACE]);
+
+impl<'tcx> LateLintPass<'tcx> for TrimSplitWhitespace {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ let tyckres = cx.typeck_results();
+ if_chain! {
+ if let ExprKind::MethodCall(path, split_recv, [], split_ws_span) = expr.kind;
+ if path.ident.name == sym!(split_whitespace);
+ if let Some(split_ws_def_id) = tyckres.type_dependent_def_id(expr.hir_id);
+ if cx.tcx.is_diagnostic_item(sym::str_split_whitespace, split_ws_def_id);
+ if let ExprKind::MethodCall(path, _trim_recv, [], trim_span) = split_recv.kind;
+ if let trim_fn_name @ ("trim" | "trim_start" | "trim_end") = path.ident.name.as_str();
+ if let Some(trim_def_id) = tyckres.type_dependent_def_id(split_recv.hir_id);
+ if is_one_of_trim_diagnostic_items(cx, trim_def_id);
+ then {
+ span_lint_and_sugg(
+ cx,
+ TRIM_SPLIT_WHITESPACE,
+ trim_span.with_hi(split_ws_span.lo()),
+ &format!("found call to `str::{trim_fn_name}` before `str::split_whitespace`"),
+ &format!("remove `{trim_fn_name}()`"),
+ String::new(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+fn is_one_of_trim_diagnostic_items(cx: &LateContext<'_>, trim_def_id: DefId) -> bool {
+ cx.tcx.is_diagnostic_item(sym::str_trim, trim_def_id)
+ || cx.tcx.is_diagnostic_item(sym::str_trim_start, trim_def_id)
+ || cx.tcx.is_diagnostic_item(sym::str_trim_end, trim_def_id)
+}
--- /dev/null
- /// Lint: Arithmetic.
+//! Read configurations files.
+
+#![allow(clippy::module_name_repetitions)]
+
+use serde::de::{Deserializer, IgnoredAny, IntoDeserializer, MapAccess, Visitor};
+use serde::Deserialize;
+use std::error::Error;
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+use std::{cmp, env, fmt, fs, io, iter};
+
+#[rustfmt::skip]
+const DEFAULT_DOC_VALID_IDENTS: &[&str] = &[
+ "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
+ "DirectX",
+ "ECMAScript",
+ "GPLv2", "GPLv3",
+ "GitHub", "GitLab",
+ "IPv4", "IPv6",
+ "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript",
+ "NaN", "NaNs",
+ "OAuth", "GraphQL",
+ "OCaml",
+ "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenDNS",
+ "WebGL",
+ "TensorFlow",
+ "TrueType",
+ "iOS", "macOS", "FreeBSD",
+ "TeX", "LaTeX", "BibTeX", "BibLaTeX",
+ "MinGW",
+ "CamelCase",
+];
+const DEFAULT_DISALLOWED_NAMES: &[&str] = &["foo", "baz", "quux"];
+
+/// Holds information used by `MISSING_ENFORCED_IMPORT_RENAMES` lint.
+#[derive(Clone, Debug, Deserialize)]
+pub struct Rename {
+ pub path: String,
+ pub rename: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DisallowedPath {
+ Simple(String),
+ WithReason { path: String, reason: Option<String> },
+}
+
+impl DisallowedPath {
+ pub fn path(&self) -> &str {
+ let (Self::Simple(path) | Self::WithReason { path, .. }) = self;
+
+ path
+ }
+
+ pub fn reason(&self) -> Option<String> {
+ match self {
+ Self::WithReason {
+ reason: Some(reason), ..
+ } => Some(format!("{reason} (from clippy.toml)")),
+ _ => None,
+ }
+ }
+}
+
+/// Conf with parse errors
+#[derive(Default)]
+pub struct TryConf {
+ pub conf: Conf,
+ pub errors: Vec<Box<dyn Error>>,
+ pub warnings: Vec<Box<dyn Error>>,
+}
+
+impl TryConf {
+ fn from_error(error: impl Error + 'static) -> Self {
+ Self {
+ conf: Conf::default(),
+ errors: vec![Box::new(error)],
+ warnings: vec![],
+ }
+ }
+}
+
+#[derive(Debug)]
+struct ConfError(String);
+
+impl fmt::Display for ConfError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ <String as fmt::Display>::fmt(&self.0, f)
+ }
+}
+
+impl Error for ConfError {}
+
+fn conf_error(s: impl Into<String>) -> Box<dyn Error> {
+ Box::new(ConfError(s.into()))
+}
+
+macro_rules! define_Conf {
+ ($(
+ $(#[doc = $doc:literal])+
+ $(#[conf_deprecated($dep:literal, $new_conf:ident)])?
+ ($name:ident: $ty:ty = $default:expr),
+ )*) => {
+ /// Clippy lint configuration
+ pub struct Conf {
+ $($(#[doc = $doc])+ pub $name: $ty,)*
+ }
+
+ mod defaults {
+ $(pub fn $name() -> $ty { $default })*
+ }
+
+ impl Default for Conf {
+ fn default() -> Self {
+ Self { $($name: defaults::$name(),)* }
+ }
+ }
+
+ impl<'de> Deserialize<'de> for TryConf {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
+ deserializer.deserialize_map(ConfVisitor)
+ }
+ }
+
+ #[derive(Deserialize)]
+ #[serde(field_identifier, rename_all = "kebab-case")]
+ #[allow(non_camel_case_types)]
+ enum Field { $($name,)* third_party, }
+
+ struct ConfVisitor;
+
+ impl<'de> Visitor<'de> for ConfVisitor {
+ type Value = TryConf;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ formatter.write_str("Conf")
+ }
+
+ fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error> where V: MapAccess<'de> {
+ let mut errors = Vec::new();
+ let mut warnings = Vec::new();
+ $(let mut $name = None;)*
+ // could get `Field` here directly, but get `str` first for diagnostics
+ while let Some(name) = map.next_key::<&str>()? {
+ match Field::deserialize(name.into_deserializer())? {
+ $(Field::$name => {
+ $(warnings.push(conf_error(format!("deprecated field `{}`. {}", name, $dep)));)?
+ match map.next_value() {
+ Err(e) => errors.push(conf_error(e.to_string())),
+ Ok(value) => match $name {
+ Some(_) => errors.push(conf_error(format!("duplicate field `{}`", name))),
+ None => {
+ $name = Some(value);
+ // $new_conf is the same as one of the defined `$name`s, so
+ // this variable is defined in line 2 of this function.
+ $(match $new_conf {
+ Some(_) => errors.push(conf_error(concat!(
+ "duplicate field `", stringify!($new_conf),
+ "` (provided as `", stringify!($name), "`)"
+ ))),
+ None => $new_conf = $name.clone(),
+ })?
+ },
+ }
+ }
+ })*
+ // white-listed; ignore
+ Field::third_party => drop(map.next_value::<IgnoredAny>())
+ }
+ }
+ let conf = Conf { $($name: $name.unwrap_or_else(defaults::$name),)* };
+ Ok(TryConf { conf, errors, warnings })
+ }
+ }
+
+ #[cfg(feature = "internal")]
+ pub mod metadata {
+ use crate::utils::internal_lints::metadata_collector::ClippyConfiguration;
+
+ macro_rules! wrap_option {
+ () => (None);
+ ($x:literal) => (Some($x));
+ }
+
+ pub(crate) fn get_configuration_metadata() -> Vec<ClippyConfiguration> {
+ vec![
+ $(
+ {
+ let deprecation_reason = wrap_option!($($dep)?);
+
+ ClippyConfiguration::new(
+ stringify!($name),
+ stringify!($ty),
+ format!("{:?}", super::defaults::$name()),
+ concat!($($doc, '\n',)*),
+ deprecation_reason,
+ )
+ },
+ )+
+ ]
+ }
+ }
+ };
+}
+
+define_Conf! {
- /// Suppress checking of the passed type names.
++ /// Lint: ARITHMETIC_SIDE_EFFECTS.
+ ///
++ /// Suppress checking of the passed type names in all types of operations.
++ ///
++ /// If a specific operation is desired, consider using `arithmetic_side_effects_allowed_binary` or `arithmetic_side_effects_allowed_unary` instead.
++ ///
++ /// #### Example
++ ///
++ /// ```toml
++ /// arithmetic-side-effects-allowed = ["SomeType", "AnotherType"]
++ /// ```
++ ///
++ /// #### Noteworthy
++ ///
++ /// A type, say `SomeType`, listed in this configuration has the same behavior of `["SomeType" , "*"], ["*", "SomeType"]` in `arithmetic_side_effects_allowed_binary`.
+ (arithmetic_side_effects_allowed: rustc_data_structures::fx::FxHashSet<String> = <_>::default()),
++ /// Lint: ARITHMETIC_SIDE_EFFECTS.
++ ///
++ /// Suppress checking of the passed type pair names in binary operations like addition or
++ /// multiplication.
++ ///
++ /// Supports the "*" wildcard to indicate that a certain type won't trigger the lint regardless
++ /// of the involved counterpart. For example, `["SomeType", "*"]` or `["*", "AnotherType"]`.
++ ///
++ /// Pairs are asymmetric, which means that `["SomeType", "AnotherType"]` is not the same as
++ /// `["AnotherType", "SomeType"]`.
++ ///
++ /// #### Example
++ ///
++ /// ```toml
++ /// arithmetic-side-effects-allowed-binary = [["SomeType" , "f32"], ["AnotherType", "*"]]
++ /// ```
++ (arithmetic_side_effects_allowed_binary: Vec<[String; 2]> = <_>::default()),
++ /// Lint: ARITHMETIC_SIDE_EFFECTS.
++ ///
++ /// Suppress checking of the passed type names in unary operations like "negation" (`-`).
++ ///
++ /// #### Example
++ ///
++ /// ```toml
++ /// arithmetic-side-effects-allowed-unary = ["SomeType", "AnotherType"]
++ /// ```
++ (arithmetic_side_effects_allowed_unary: rustc_data_structures::fx::FxHashSet<String> = <_>::default()),
+ /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UNUSED_SELF, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX.
+ ///
+ /// Suppress lints whenever the suggested change would cause breakage for other crates.
+ (avoid_breaking_exported_api: bool = true),
+ /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED, UNINLINED_FORMAT_ARGS, MANUAL_CLAMP, MANUAL_LET_ELSE, UNCHECKED_DURATION_SUBTRACTION.
+ ///
+ /// The minimum rust version that the project supports
+ (msrv: Option<String> = None),
+ /// DEPRECATED LINT: BLACKLISTED_NAME.
+ ///
+ /// Use the Disallowed Names lint instead
+ #[conf_deprecated("Please use `disallowed-names` instead", disallowed_names)]
+ (blacklisted_names: Vec<String> = Vec::new()),
+ /// Lint: COGNITIVE_COMPLEXITY.
+ ///
+ /// The maximum cognitive complexity a function can have
+ (cognitive_complexity_threshold: u64 = 25),
+ /// DEPRECATED LINT: CYCLOMATIC_COMPLEXITY.
+ ///
+ /// Use the Cognitive Complexity lint instead.
+ #[conf_deprecated("Please use `cognitive-complexity-threshold` instead", cognitive_complexity_threshold)]
+ (cyclomatic_complexity_threshold: u64 = 25),
+ /// Lint: DISALLOWED_NAMES.
+ ///
+ /// The list of disallowed names to lint about. NB: `bar` is not here since it has legitimate uses. The value
+ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
+ /// default configuration of Clippy. By default any configuration will replace the default value.
+ (disallowed_names: Vec<String> = super::DEFAULT_DISALLOWED_NAMES.iter().map(ToString::to_string).collect()),
+ /// Lint: DOC_MARKDOWN.
+ ///
+ /// The list of words this lint should not consider as identifiers needing ticks. The value
+ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
+ /// default configuration of Clippy. By default any configuraction will replace the default value. For example:
+ /// * `doc-valid-idents = ["ClipPy"]` would replace the default list with `["ClipPy"]`.
+ /// * `doc-valid-idents = ["ClipPy", ".."]` would append `ClipPy` to the default list.
+ ///
+ /// Default list:
+ (doc_valid_idents: Vec<String> = super::DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string).collect()),
+ /// Lint: TOO_MANY_ARGUMENTS.
+ ///
+ /// The maximum number of argument a function or method can have
+ (too_many_arguments_threshold: u64 = 7),
+ /// Lint: TYPE_COMPLEXITY.
+ ///
+ /// The maximum complexity a type can have
+ (type_complexity_threshold: u64 = 250),
+ /// Lint: MANY_SINGLE_CHAR_NAMES.
+ ///
+ /// The maximum number of single char bindings a scope may have
+ (single_char_binding_names_threshold: u64 = 4),
+ /// Lint: BOXED_LOCAL, USELESS_VEC.
+ ///
+ /// The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
+ (too_large_for_stack: u64 = 200),
+ /// Lint: ENUM_VARIANT_NAMES.
+ ///
+ /// The minimum number of enum variants for the lints about variant names to trigger
+ (enum_variant_name_threshold: u64 = 3),
+ /// Lint: LARGE_ENUM_VARIANT.
+ ///
+ /// The maximum size of an enum's variant to avoid box suggestion
+ (enum_variant_size_threshold: u64 = 200),
+ /// Lint: VERBOSE_BIT_MASK.
+ ///
+ /// The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
+ (verbose_bit_mask_threshold: u64 = 1),
+ /// Lint: DECIMAL_LITERAL_REPRESENTATION.
+ ///
+ /// The lower bound for linting decimal literals
+ (literal_representation_threshold: u64 = 16384),
+ /// Lint: TRIVIALLY_COPY_PASS_BY_REF.
+ ///
+ /// The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
+ (trivial_copy_size_limit: Option<u64> = None),
+ /// Lint: LARGE_TYPE_PASS_BY_MOVE.
+ ///
+ /// The minimum size (in bytes) to consider a type for passing by reference instead of by value.
+ (pass_by_value_size_limit: u64 = 256),
+ /// Lint: TOO_MANY_LINES.
+ ///
+ /// The maximum number of lines a function or method can have
+ (too_many_lines_threshold: u64 = 100),
+ /// Lint: LARGE_STACK_ARRAYS, LARGE_CONST_ARRAYS.
+ ///
+ /// The maximum allowed size for arrays on the stack
+ (array_size_threshold: u64 = 512_000),
+ /// Lint: VEC_BOX.
+ ///
+ /// The size of the boxed type in bytes, where boxing in a `Vec` is allowed
+ (vec_box_size_threshold: u64 = 4096),
+ /// Lint: TYPE_REPETITION_IN_BOUNDS.
+ ///
+ /// The maximum number of bounds a trait can have to be linted
+ (max_trait_bounds: u64 = 3),
+ /// Lint: STRUCT_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool fields a struct can have
+ (max_struct_bools: u64 = 3),
+ /// Lint: FN_PARAMS_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool parameters a function can have
+ (max_fn_params_bools: u64 = 3),
+ /// Lint: WILDCARD_IMPORTS.
+ ///
+ /// Whether to allow certain wildcard imports (prelude, super in tests).
+ (warn_on_all_wildcard_imports: bool = false),
+ /// Lint: DISALLOWED_MACROS.
+ ///
+ /// The list of disallowed macros, written as fully qualified paths.
+ (disallowed_macros: Vec<crate::utils::conf::DisallowedPath> = Vec::new()),
+ /// Lint: DISALLOWED_METHODS.
+ ///
+ /// The list of disallowed methods, written as fully qualified paths.
+ (disallowed_methods: Vec<crate::utils::conf::DisallowedPath> = Vec::new()),
+ /// Lint: DISALLOWED_TYPES.
+ ///
+ /// The list of disallowed types, written as fully qualified paths.
+ (disallowed_types: Vec<crate::utils::conf::DisallowedPath> = Vec::new()),
+ /// Lint: UNREADABLE_LITERAL.
+ ///
+ /// Should the fraction of a decimal be linted to include separators.
+ (unreadable_literal_lint_fractions: bool = true),
+ /// Lint: UPPER_CASE_ACRONYMS.
+ ///
+ /// Enables verbose mode. Triggers if there is more than one uppercase char next to each other
+ (upper_case_acronyms_aggressive: bool = false),
+ /// Lint: MANUAL_LET_ELSE.
+ ///
+ /// Whether the matches should be considered by the lint, and whether there should
+ /// be filtering for common types.
+ (matches_for_let_else: crate::manual_let_else::MatchLintBehaviour =
+ crate::manual_let_else::MatchLintBehaviour::WellKnownTypes),
+ /// Lint: _CARGO_COMMON_METADATA.
+ ///
+ /// For internal testing only, ignores the current `publish` settings in the Cargo manifest.
+ (cargo_ignore_publish: bool = false),
+ /// Lint: NONSTANDARD_MACRO_BRACES.
+ ///
+ /// Enforce the named macros always use the braces specified.
+ ///
+ /// A `MacroMatcher` can be added like so `{ name = "macro_name", brace = "(" }`. If the macro
+ /// is could be used with a full path two `MacroMatcher`s have to be added one with the full path
+ /// `crate_name::macro_name` and one with just the macro name.
+ (standard_macro_braces: Vec<crate::nonstandard_macro_braces::MacroMatcher> = Vec::new()),
+ /// Lint: MISSING_ENFORCED_IMPORT_RENAMES.
+ ///
+ /// The list of imports to always rename, a fully qualified path followed by the rename.
+ (enforced_import_renames: Vec<crate::utils::conf::Rename> = Vec::new()),
+ /// Lint: DISALLOWED_SCRIPT_IDENTS.
+ ///
+ /// The list of unicode scripts allowed to be used in the scope.
+ (allowed_scripts: Vec<String> = vec!["Latin".to_string()]),
+ /// Lint: NON_SEND_FIELDS_IN_SEND_TY.
+ ///
+ /// Whether to apply the raw pointer heuristic to determine if a type is `Send`.
+ (enable_raw_pointer_heuristic_for_send: bool = true),
+ /// Lint: INDEX_REFUTABLE_SLICE.
+ ///
+ /// When Clippy suggests using a slice pattern, this is the maximum number of elements allowed in
+ /// the slice pattern that is suggested. If more elements would be necessary, the lint is suppressed.
+ /// For example, `[_, _, _, e, ..]` is a slice pattern with 4 elements.
+ (max_suggested_slice_pattern_length: u64 = 3),
+ /// Lint: AWAIT_HOLDING_INVALID_TYPE
+ (await_holding_invalid_types: Vec<crate::utils::conf::DisallowedPath> = Vec::new()),
+ /// Lint: LARGE_INCLUDE_FILE.
+ ///
+ /// The maximum size of a file included via `include_bytes!()` or `include_str!()`, in bytes
+ (max_include_file_size: u64 = 1_000_000),
+ /// Lint: EXPECT_USED.
+ ///
+ /// Whether `expect` should be allowed within `#[cfg(test)]`
+ (allow_expect_in_tests: bool = false),
+ /// Lint: UNWRAP_USED.
+ ///
+ /// Whether `unwrap` should be allowed in test cfg
+ (allow_unwrap_in_tests: bool = false),
+ /// Lint: DBG_MACRO.
+ ///
+ /// Whether `dbg!` should be allowed in test functions
+ (allow_dbg_in_tests: bool = false),
+ /// Lint: PRINT_STDOUT, PRINT_STDERR.
+ ///
+ /// Whether print macros (ex. `println!`) should be allowed in test functions
+ (allow_print_in_tests: bool = false),
+ /// Lint: RESULT_LARGE_ERR.
+ ///
+ /// The maximum size of the `Err`-variant in a `Result` returned from a function
+ (large_error_threshold: u64 = 128),
+ /// Lint: MUTABLE_KEY.
+ ///
+ /// A list of paths to types that should be treated like `Arc`, i.e. ignored but
+ /// for the generic parameters for determining interior mutability
+ (ignore_interior_mutability: Vec<String> = Vec::from(["bytes::Bytes".into()])),
+ /// Lint: UNINLINED_FORMAT_ARGS.
+ ///
+ /// Whether to allow mixed uninlined format args, e.g. `format!("{} {}", a, foo.bar)`
+ (allow_mixed_uninlined_format_args: bool = true),
++ /// Lint: INDEXING_SLICING
++ ///
++ /// Whether to suppress a restriction lint in constant code. In same
++ /// cases the restructured operation might not be unavoidable, as the
++ /// suggested counterparts are unavailable in constant code. This
++ /// configuration will cause restriction lints to trigger even
++ /// if no suggestion can be made.
++ (suppress_restriction_lint_in_const: bool = false),
+}
+
+/// Search for the configuration file.
+///
+/// # Errors
+///
+/// Returns any unexpected filesystem error encountered when searching for the config file
+pub fn lookup_conf_file() -> io::Result<Option<PathBuf>> {
+ /// Possible filename to search for.
+ const CONFIG_FILE_NAMES: [&str; 2] = [".clippy.toml", "clippy.toml"];
+
+ // Start looking for a config file in CLIPPY_CONF_DIR, or failing that, CARGO_MANIFEST_DIR.
+ // If neither of those exist, use ".".
+ let mut current = env::var_os("CLIPPY_CONF_DIR")
+ .or_else(|| env::var_os("CARGO_MANIFEST_DIR"))
+ .map_or_else(|| PathBuf::from("."), PathBuf::from);
+
+ let mut found_config: Option<PathBuf> = None;
+
+ loop {
+ for config_file_name in &CONFIG_FILE_NAMES {
+ if let Ok(config_file) = current.join(config_file_name).canonicalize() {
+ match fs::metadata(&config_file) {
+ Err(e) if e.kind() == io::ErrorKind::NotFound => {},
+ Err(e) => return Err(e),
+ Ok(md) if md.is_dir() => {},
+ Ok(_) => {
+ // warn if we happen to find two config files #8323
+ if let Some(ref found_config_) = found_config {
+ eprintln!(
+ "Using config file `{}`\nWarning: `{}` will be ignored.",
+ found_config_.display(),
+ config_file.display(),
+ );
+ } else {
+ found_config = Some(config_file);
+ }
+ },
+ }
+ }
+ }
+
+ if found_config.is_some() {
+ return Ok(found_config);
+ }
+
+ // If the current directory has no parent, we're done searching.
+ if !current.pop() {
+ return Ok(None);
+ }
+ }
+}
+
+/// Read the `toml` configuration file.
+///
+/// In case of error, the function tries to continue as much as possible.
+pub fn read(path: &Path) -> TryConf {
+ let content = match fs::read_to_string(path) {
+ Err(e) => return TryConf::from_error(e),
+ Ok(content) => content,
+ };
+ match toml::from_str::<TryConf>(&content) {
+ Ok(mut conf) => {
+ extend_vec_if_indicator_present(&mut conf.conf.doc_valid_idents, DEFAULT_DOC_VALID_IDENTS);
+ extend_vec_if_indicator_present(&mut conf.conf.disallowed_names, DEFAULT_DISALLOWED_NAMES);
+
+ conf
+ },
+ Err(e) => TryConf::from_error(e),
+ }
+}
+
+fn extend_vec_if_indicator_present(vec: &mut Vec<String>, default: &[&str]) {
+ if vec.contains(&"..".to_string()) {
+ vec.extend(default.iter().map(ToString::to_string));
+ }
+}
+
+const SEPARATOR_WIDTH: usize = 4;
+
+// Check whether the error is "unknown field" and, if so, list the available fields sorted and at
+// least one per line, more if `CLIPPY_TERMINAL_WIDTH` is set and allows it.
+pub fn format_error(error: Box<dyn Error>) -> String {
+ let s = error.to_string();
+
+ if_chain! {
+ if error.downcast::<toml::de::Error>().is_ok();
+ if let Some((prefix, mut fields, suffix)) = parse_unknown_field_message(&s);
+ then {
+ use fmt::Write;
+
+ fields.sort_unstable();
+
+ let (rows, column_widths) = calculate_dimensions(&fields);
+
+ let mut msg = String::from(prefix);
+ for row in 0..rows {
+ writeln!(msg).unwrap();
+ for (column, column_width) in column_widths.iter().copied().enumerate() {
+ let index = column * rows + row;
+ let field = fields.get(index).copied().unwrap_or_default();
+ write!(
+ msg,
+ "{:SEPARATOR_WIDTH$}{field:column_width$}",
+ " "
+ )
+ .unwrap();
+ }
+ }
+ write!(msg, "\n{suffix}").unwrap();
+ msg
+ } else {
+ s
+ }
+ }
+}
+
+// `parse_unknown_field_message` will become unnecessary if
+// https://github.com/alexcrichton/toml-rs/pull/364 is merged.
+fn parse_unknown_field_message(s: &str) -> Option<(&str, Vec<&str>, &str)> {
+ // An "unknown field" message has the following form:
+ // unknown field `UNKNOWN`, expected one of `FIELD0`, `FIELD1`, ..., `FIELDN` at line X column Y
+ // ^^ ^^^^ ^^
+ if_chain! {
+ if s.starts_with("unknown field");
+ let slices = s.split("`, `").collect::<Vec<_>>();
+ let n = slices.len();
+ if n >= 2;
+ if let Some((prefix, first_field)) = slices[0].rsplit_once(" `");
+ if let Some((last_field, suffix)) = slices[n - 1].split_once("` ");
+ then {
+ let fields = iter::once(first_field)
+ .chain(slices[1..n - 1].iter().copied())
+ .chain(iter::once(last_field))
+ .collect::<Vec<_>>();
+ Some((prefix, fields, suffix))
+ } else {
+ None
+ }
+ }
+}
+
+fn calculate_dimensions(fields: &[&str]) -> (usize, Vec<usize>) {
+ let columns = env::var("CLIPPY_TERMINAL_WIDTH")
+ .ok()
+ .and_then(|s| <usize as FromStr>::from_str(&s).ok())
+ .map_or(1, |terminal_width| {
+ let max_field_width = fields.iter().map(|field| field.len()).max().unwrap();
+ cmp::max(1, terminal_width / (SEPARATOR_WIDTH + max_field_width))
+ });
+
+ let rows = (fields.len() + (columns - 1)) / columns;
+
+ let column_widths = (0..columns)
+ .map(|column| {
+ if column < columns - 1 {
+ (0..rows)
+ .map(|row| {
+ let index = column * rows + row;
+ let field = fields.get(index).copied().unwrap_or_default();
+ field.len()
+ })
+ .max()
+ .unwrap()
+ } else {
+ // Avoid adding extra space to the last column.
+ 0
+ }
+ })
+ .collect::<Vec<_>>();
+
+ (rows, column_widths)
+}
--- /dev/null
- use rustc_middle::ty::{self, fast_reject::SimplifiedTypeGen, FloatTy};
+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;
+use rustc_hir::Item;
+use rustc_hir_analysis::hir_ty_to_ty;
+use rustc_lint::{LateContext, LateLintPass};
- SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F32),
- SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F64),
- SimplifiedTypeGen::SliceSimplifiedType,
- SimplifiedTypeGen::StrSimplifiedType,
++use rustc_middle::ty::{self, fast_reject::SimplifiedType, 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).is_empty() {
+ 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 = [
++ SimplifiedType::FloatSimplifiedType(FloatTy::F32),
++ SimplifiedType::FloatSimplifiedType(FloatTy::F64),
++ SimplifiedType::SliceSimplifiedType,
++ SimplifiedType::StrSimplifiedType,
+ ]
+ .iter()
+ .flat_map(|&ty| cx.tcx.incoherent_impls(ty).iter().copied());
+ for item_def_id in lang_items.iter().map(|(_, def_id)| def_id).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
- version = "0.1.67"
+[package]
+name = "clippy_utils"
++version = "0.1.68"
+edition = "2021"
+publish = false
+
+[dependencies]
+arrayvec = { version = "0.7", default-features = false }
+if_chain = "1.0"
+itertools = "0.10.1"
+rustc-semver = "1.1"
+
+[features]
+deny-warnings = []
+internal = []
+
+[package.metadata.rust-analyzer]
+# This crate uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
- kind: ItemKind::Const(..) | ItemKind::Static(..),
+#![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, is_bool, 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::def::{DefKind, Res};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, LOCAL_CRATE};
+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::{
+ self as hir, def, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Closure, Constness, Destination,
+ Expr, ExprKind, FnDecl, HirId, Impl, ImplItem, ImplItemKind, ImplItemRef, IsAsync, Item, ItemKind, LangItem, Local,
+ MatchSource, Mutability, Node, OwnerId, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind,
+ TraitItem, TraitItemKind, TraitItemRef, 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::SimplifiedType::{
+ 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_span::hygiene::{ExpnKind, MacroKind};
+use rustc_span::source_map::SourceMap;
+use rustc_span::sym;
+use rustc_span::symbol::{kw, Ident, Symbol};
+use rustc_span::Span;
+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;
+
+#[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);
+ self.msrv.enter_lint_attrs(sess, attrs);
+ }
+
+ fn exit_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
+ let sess = rustc_lint::LintContext::sess(cx);
+ self.msrv.exit_lint_attrs(sess, attrs);
+ }
+ };
+}
+
+/// 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(..) | ItemKind::Enum(..),
+ ..
+ })
+ | 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 Some(lang_id) = cx.tcx.lang_items().get(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().get(item) == Some(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 lang item.
+pub fn is_path_lang_item<'tcx>(cx: &LateContext<'_>, maybe_path: &impl MaybePath<'tcx>, lang_item: LangItem) -> bool {
+ path_def_id(cx, maybe_path).map_or(false, |id| cx.tcx.lang_items().get(lang_item) == Some(id))
+}
+
+/// 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_impls<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
+ let ty = match name {
+ "bool" => BoolSimplifiedType,
+ "char" => CharSimplifiedType,
+ "str" => StrSimplifiedType,
+ "array" => ArraySimplifiedType,
+ "slice" => SliceSimplifiedType,
+ // FIXME: rustdoc documents these two using just `pointer`.
+ //
+ // Maybe this is something we should do here too.
+ "const_ptr" => PtrSimplifiedType(Mutability::Not),
+ "mut_ptr" => PtrSimplifiedType(Mutability::Mut),
+ "isize" => IntSimplifiedType(IntTy::Isize),
+ "i8" => IntSimplifiedType(IntTy::I8),
+ "i16" => IntSimplifiedType(IntTy::I16),
+ "i32" => IntSimplifiedType(IntTy::I32),
+ "i64" => IntSimplifiedType(IntTy::I64),
+ "i128" => IntSimplifiedType(IntTy::I128),
+ "usize" => UintSimplifiedType(UintTy::Usize),
+ "u8" => UintSimplifiedType(UintTy::U8),
+ "u16" => UintSimplifiedType(UintTy::U16),
+ "u32" => UintSimplifiedType(UintTy::U32),
+ "u64" => UintSimplifiedType(UintTy::U64),
+ "u128" => UintSimplifiedType(UintTy::U128),
+ "f32" => FloatSimplifiedType(FloatTy::F32),
+ "f64" => FloatSimplifiedType(FloatTy::F64),
+ _ => return [].iter().copied(),
+ };
+
+ tcx.incoherent_impls(ty).iter().copied()
+}
+
+fn non_local_item_children_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: Symbol) -> Vec<Res> {
+ match tcx.def_kind(def_id) {
+ DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
+ .module_children(def_id)
+ .iter()
+ .filter(|item| item.ident.name == name)
+ .map(|child| child.res.expect_non_local())
+ .collect(),
+ DefKind::Impl => tcx
+ .associated_item_def_ids(def_id)
+ .iter()
+ .copied()
+ .filter(|assoc_def_id| tcx.item_name(*assoc_def_id) == name)
+ .map(|assoc_def_id| Res::Def(tcx.def_kind(assoc_def_id), assoc_def_id))
+ .collect(),
+ _ => Vec::new(),
+ }
+}
+
+fn local_item_children_by_name(tcx: TyCtxt<'_>, local_id: LocalDefId, name: Symbol) -> Vec<Res> {
+ let hir = tcx.hir();
+
+ let root_mod;
+ let item_kind = match hir.find_by_def_id(local_id) {
+ Some(Node::Crate(r#mod)) => {
+ root_mod = ItemKind::Mod(r#mod);
+ &root_mod
+ },
+ Some(Node::Item(item)) => &item.kind,
+ _ => return Vec::new(),
+ };
+
+ let res = |ident: Ident, owner_id: OwnerId| {
+ if ident.name == name {
+ let def_id = owner_id.to_def_id();
+ Some(Res::Def(tcx.def_kind(def_id), def_id))
+ } else {
+ None
+ }
+ };
+
+ match item_kind {
+ ItemKind::Mod(r#mod) => r#mod
+ .item_ids
+ .iter()
+ .filter_map(|&item_id| res(hir.item(item_id).ident, item_id.owner_id))
+ .collect(),
+ ItemKind::Impl(r#impl) => r#impl
+ .items
+ .iter()
+ .filter_map(|&ImplItemRef { ident, id, .. }| res(ident, id.owner_id))
+ .collect(),
+ ItemKind::Trait(.., trait_item_refs) => trait_item_refs
+ .iter()
+ .filter_map(|&TraitItemRef { ident, id, .. }| res(ident, id.owner_id))
+ .collect(),
+ _ => Vec::new(),
+ }
+}
+
+fn item_children_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: Symbol) -> Vec<Res> {
+ if let Some(local_id) = def_id.as_local() {
+ local_item_children_by_name(tcx, local_id, name)
+ } else {
+ non_local_item_children_by_name(tcx, def_id, name)
+ }
+}
+
+/// Resolves a def path like `std::vec::Vec`.
+///
+/// Can return multiple resolutions when there are multiple versions of the same crate, e.g.
+/// `memchr::memchr` could return the functions from both memchr 1.0 and memchr 2.0.
+///
+/// Also returns multiple results when there are mulitple paths under the same name e.g. `std::vec`
+/// would have both a [`DefKind::Mod`] and [`DefKind::Macro`].
+///
+/// This function is expensive and should be used sparingly.
+pub fn def_path_res(cx: &LateContext<'_>, path: &[&str]) -> Vec<Res> {
+ fn find_crates(tcx: TyCtxt<'_>, name: Symbol) -> impl Iterator<Item = DefId> + '_ {
+ tcx.crates(())
+ .iter()
+ .copied()
+ .filter(move |&num| tcx.crate_name(num) == name)
+ .map(CrateNum::as_def_id)
+ }
+
+ let tcx = cx.tcx;
+
+ let (base, mut path) = match *path {
+ [primitive] => {
+ return vec![PrimTy::from_name(Symbol::intern(primitive)).map_or(Res::Err, Res::PrimTy)];
+ },
+ [base, ref path @ ..] => (base, path),
+ _ => return Vec::new(),
+ };
+
+ let base_sym = Symbol::intern(base);
+
+ let local_crate = if tcx.crate_name(LOCAL_CRATE) == base_sym {
+ Some(LOCAL_CRATE.as_def_id())
+ } else {
+ None
+ };
+
+ let starts = find_primitive_impls(tcx, base)
+ .chain(find_crates(tcx, base_sym))
+ .chain(local_crate)
+ .map(|id| Res::Def(tcx.def_kind(id), id));
+
+ let mut resolutions: Vec<Res> = starts.collect();
+
+ while let [segment, rest @ ..] = path {
+ path = rest;
+ let segment = Symbol::intern(segment);
+
+ resolutions = resolutions
+ .into_iter()
+ .filter_map(|res| res.opt_def_id())
+ .flat_map(|def_id| {
+ // When the current def_id is e.g. `struct S`, check the impl items in
+ // `impl S { ... }`
+ let inherent_impl_children = tcx
+ .inherent_impls(def_id)
+ .iter()
+ .flat_map(|&impl_def_id| item_children_by_name(tcx, impl_def_id, segment));
+
+ let direct_children = item_children_by_name(tcx, def_id, segment);
+
+ inherent_impl_children.chain(direct_children)
+ })
+ .collect();
+ }
+
+ resolutions
+}
+
+/// Resolves a def path like `std::vec::Vec` to its [`DefId`]s, see [`def_path_res`].
+pub fn def_path_def_ids(cx: &LateContext<'_>, path: &[&str]) -> impl Iterator<Item = DefId> {
+ def_path_res(cx, path).into_iter().filter_map(|res| res.opt_def_id())
+}
+
+/// 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> {
+ def_path_res(cx, path).into_iter().find_map(|res| match res {
+ 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::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()) || Some(adt.did()) == cx.tcx.lang_items().string()
+ });
+ }
+ }
+ }
+ }
+ 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_lang_item(cx, ty, LangItem::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(cx: &LateContext<'_>, 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()
+}
+
+/// 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 has_repr_attr(cx: &LateContext<'_>, hir_id: HirId) -> bool {
+ has_attr(cx.tcx.hir().attrs(hir_id), sym::repr)
+}
+
+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(cx: &LateContext<'_>, 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 {
+ match kind {
+ FnKind::ItemFn(_, _, header) => header.asyncness == IsAsync::Async,
+ FnKind::Method(_, sig) => sig.header.asyncness == IsAsync::Async,
+ FnKind::Closure => false,
+ }
+}
+
+/// 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.owner_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
+#![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,
+ sym::core_panic_macro
+ | sym::std_panic_macro
+ | sym::core_panic_2015_macro
+ | sym::std_panic_2015_macro
+ | sym::core_panic_2021_macro
+ )
+}
+
++/// Is `def_id` of `assert!` or `debug_assert!`
++pub fn is_assert_macro(cx: &LateContext<'_>, def_id: DefId) -> bool {
++ let Some(name) = cx.tcx.get_diagnostic_name(def_id) else { return false };
++ matches!(name, sym::assert_macro | sym::debug_assert_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.
+ 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::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,
+ )?),
+ rpf::Count::CountImplied => Self::Implied(span),
+ })
+ }
+
+ pub fn is_implied(self) -> bool {
+ 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
- 1,58,0 { FORMAT_ARGS_CAPTURE }
+use std::sync::OnceLock;
+
+use rustc_ast::Attribute;
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+use rustc_span::Span;
+
+use crate::attrs::get_unique_attr;
+
+macro_rules! msrv_aliases {
+ ($($major:literal,$minor:literal,$patch:literal {
+ $($name:ident),* $(,)?
+ })*) => {
+ $($(
+ pub const $name: RustcVersion = RustcVersion::new($major, $minor, $patch);
+ )*)*
+ };
+}
+
+// names may refer to stabilized feature flags or library items
+msrv_aliases! {
+ 1,65,0 { LET_ELSE }
+ 1,62,0 { BOOL_THEN_SOME }
++ 1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY }
+ 1,53,0 { OR_PATTERNS, MANUAL_BITS, BTREE_MAP_RETAIN, BTREE_SET_RETAIN, ARRAY_INTO_ITERATOR }
+ 1,52,0 { STR_SPLIT_ONCE, REM_EUCLID_CONST }
+ 1,51,0 { BORROW_AS_PTR, SEEK_FROM_CURRENT, UNSIGNED_ABS }
+ 1,50,0 { BOOL_THEN, CLAMP }
+ 1,47,0 { TAU, IS_ASCII_DIGIT_CONST }
+ 1,46,0 { CONST_IF_MATCH }
+ 1,45,0 { STR_STRIP_PREFIX }
+ 1,43,0 { LOG2_10, LOG10_2 }
+ 1,42,0 { MATCHES_MACRO, SLICE_PATTERNS, PTR_SLICE_RAW_PARTS }
+ 1,41,0 { RE_REBALANCING_COHERENCE, RESULT_MAP_OR_ELSE }
+ 1,40,0 { MEM_TAKE, NON_EXHAUSTIVE, OPTION_AS_DEREF }
+ 1,38,0 { POINTER_CAST, REM_EUCLID }
+ 1,37,0 { TYPE_ALIAS_ENUM_VARIANTS }
+ 1,36,0 { ITERATOR_COPIED }
+ 1,35,0 { OPTION_COPIED, RANGE_CONTAINS }
+ 1,34,0 { TRY_FROM }
+ 1,30,0 { ITERATOR_FIND_MAP, TOOL_ATTRIBUTES }
+ 1,28,0 { FROM_BOOL }
+ 1,26,0 { RANGE_INCLUSIVE, STRING_RETAIN }
+ 1,24,0 { IS_ASCII_DIGIT }
+ 1,18,0 { HASH_MAP_RETAIN, HASH_SET_RETAIN }
+ 1,17,0 { FIELD_INIT_SHORTHAND, STATIC_IN_CONST, EXPECT_ERR }
+ 1,16,0 { STR_REPEAT }
+ 1,55,0 { SEEK_REWIND }
+}
+
+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 {
+ sess.span_err(span, format!("`{msrv}` is not a valid Rust version"));
+ }
+ }
+ None
+}
+
+/// Tracks the current MSRV from `clippy.toml`, `Cargo.toml` or set via `#[clippy::msrv]`
+#[derive(Debug, Clone, Default)]
+pub struct Msrv {
+ stack: Vec<RustcVersion>,
+}
+
+impl Msrv {
+ fn new(initial: Option<RustcVersion>) -> Self {
+ Self {
+ stack: Vec::from_iter(initial),
+ }
+ }
+
+ fn read_inner(conf_msrv: &Option<String>, sess: &Session) -> Self {
+ 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.err(format!(
+ "error reading Clippy's configuration file. `{s}` is not a valid Rust version"
+ ));
+ None
+ })
+ });
+
+ // if both files have an msrv, let's compare them and emit a warning if they differ
+ if let Some(cargo_msrv) = cargo_msrv
+ && let Some(clippy_msrv) = clippy_msrv
+ && clippy_msrv != cargo_msrv
+ {
+ sess.warn(format!(
+ "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{clippy_msrv}` from `clippy.toml`"
+ ));
+ }
+
+ Self::new(clippy_msrv.or(cargo_msrv))
+ }
+
+ /// Set the initial MSRV from the Clippy config file or from Cargo due to the `rust-version`
+ /// field in `Cargo.toml`
+ ///
+ /// Returns a `&'static Msrv` as `Copy` types are more easily passed to the
+ /// `register_{late,early}_pass` callbacks
+ pub fn read(conf_msrv: &Option<String>, sess: &Session) -> &'static Self {
+ static PARSED: OnceLock<Msrv> = OnceLock::new();
+
+ PARSED.get_or_init(|| Self::read_inner(conf_msrv, sess))
+ }
+
+ pub fn current(&self) -> Option<RustcVersion> {
+ self.stack.last().copied()
+ }
+
+ pub fn meets(&self, required: RustcVersion) -> bool {
+ self.current().map_or(true, |version| version.meets(required))
+ }
+
+ fn parse_attr(sess: &Session, attrs: &[Attribute]) -> Option<RustcVersion> {
+ if let Some(msrv_attr) = get_unique_attr(sess, attrs, "msrv") {
+ if let Some(msrv) = msrv_attr.value_str() {
+ return parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
+ }
+
+ sess.span_err(msrv_attr.span, "bad clippy attribute");
+ }
+
+ None
+ }
+
+ pub fn enter_lint_attrs(&mut self, sess: &Session, attrs: &[Attribute]) {
+ if let Some(version) = Self::parse_attr(sess, attrs) {
+ self.stack.push(version);
+ }
+ }
+
+ pub fn exit_lint_attrs(&mut self, sess: &Session, attrs: &[Attribute]) {
+ if Self::parse_attr(sess, attrs).is_some() {
+ self.stack.pop();
+ }
+ }
+}
--- /dev/null
- pub const CORE_ITER_COLLECT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "collect"];
+//! 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_CONTAINS_KEY: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "contains_key"];
+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_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"];
+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"];
+#[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 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"];
+#[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 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 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 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"];
+#[cfg(feature = "internal")]
+pub const MSRV: [&str; 3] = ["clippy_utils", "msrvs", "Msrv"];
+pub const OPEN_OPTIONS: [&str; 3] = ["std", "fs", "OpenOptions"];
+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 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"];
+pub const REGEX_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "unicode", "RegexBuilder", "new"];
+pub const REGEX_BYTES_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "bytes", "RegexBuilder", "new"];
+pub const REGEX_BYTES_NEW: [&str; 4] = ["regex", "re_bytes", "Regex", "new"];
+pub const REGEX_BYTES_SET_NEW: [&str; 5] = ["regex", "re_set", "bytes", "RegexSet", "new"];
+pub const REGEX_NEW: [&str; 4] = ["regex", "re_unicode", "Regex", "new"];
+pub const REGEX_SET_NEW: [&str; 5] = ["regex", "re_set", "unicode", "RegexSet", "new"];
+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 STD_IO_SEEK: [&str; 3] = ["std", "io", "Seek"];
+pub const STD_IO_SEEK_FROM_CURRENT: [&str; 4] = ["std", "io", "SeekFrom", "Current"];
+pub const STD_IO_SEEKFROM_START: [&str; 4] = ["std", "io", "SeekFrom", "Start"];
+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
- TerminatorKind::SwitchInt {
- discr,
- targets: _,
- } => check_operand(tcx, discr, span, body),
+// This code used to be a part of `rustc` but moved to Clippy as a result of
+// https://github.com/rust-lang/rust/issues/76618. Because of that, it contains unused code and some
+// of terminologies might not be relevant in the context of Clippy. Note that its behavior might
+// differ from the time of `rustc` even if the name stays the same.
+
+use crate::msrvs::Msrv;
+use rustc_hir as hir;
+use rustc_hir::def_id::DefId;
+use rustc_middle::mir::{
+ Body, CastKind, NonDivergingIntrinsic, NullOp, Operand, Place, ProjectionElem, Rvalue, Statement, StatementKind,
+ Terminator, TerminatorKind,
+};
+use rustc_middle::ty::subst::GenericArgKind;
+use rustc_middle::ty::{self, adjustment::PointerCast, Ty, TyCtxt};
+use rustc_semver::RustcVersion;
+use rustc_span::symbol::sym;
+use rustc_span::Span;
+use std::borrow::Cow;
+
+type McfResult = Result<(), (Span, Cow<'static, str>)>;
+
+pub fn is_min_const_fn<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'tcx>, msrv: &Msrv) -> McfResult {
+ let def_id = body.source.def_id();
+ let mut current = def_id;
+ loop {
+ let predicates = tcx.predicates_of(current);
+ for (predicate, _) in predicates.predicates {
+ match predicate.kind().skip_binder() {
+ ty::PredicateKind::Clause(
+ ty::Clause::RegionOutlives(_)
+ | ty::Clause::TypeOutlives(_)
+ | ty::Clause::Projection(_)
+ | ty::Clause::Trait(..),
+ )
+ | ty::PredicateKind::WellFormed(_)
+ | ty::PredicateKind::ConstEvaluatable(..)
+ | ty::PredicateKind::ConstEquate(..)
+ | ty::PredicateKind::TypeWellFormedFromEnv(..) => continue,
+ ty::PredicateKind::ObjectSafe(_) => panic!("object safe predicate on function: {predicate:#?}"),
+ ty::PredicateKind::ClosureKind(..) => panic!("closure kind predicate on function: {predicate:#?}"),
+ ty::PredicateKind::Subtype(_) => panic!("subtype predicate on function: {predicate:#?}"),
+ ty::PredicateKind::Coerce(_) => panic!("coerce predicate on function: {predicate:#?}"),
+ ty::PredicateKind::Ambiguous => panic!("ambiguous predicate on function: {predicate:#?}"),
+ }
+ }
+ match predicates.parent {
+ Some(parent) => current = parent,
+ None => break,
+ }
+ }
+
+ for local in &body.local_decls {
+ check_ty(tcx, local.ty, local.source_info.span)?;
+ }
+ // impl trait is gone in MIR, so check the return type manually
+ check_ty(
+ tcx,
+ tcx.fn_sig(def_id).output().skip_binder(),
+ body.local_decls.iter().next().unwrap().source_info.span,
+ )?;
+
+ for bb in body.basic_blocks.iter() {
+ check_terminator(tcx, body, bb.terminator(), msrv)?;
+ for stmt in &bb.statements {
+ check_statement(tcx, body, def_id, stmt)?;
+ }
+ }
+ Ok(())
+}
+
+fn check_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, span: Span) -> McfResult {
+ for arg in ty.walk() {
+ let ty = match arg.unpack() {
+ GenericArgKind::Type(ty) => ty,
+
+ // No constraints on lifetimes or constants, except potentially
+ // constants' types, but `walk` will get to them as well.
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => continue,
+ };
+
+ match ty.kind() {
+ ty::Ref(_, _, hir::Mutability::Mut) => {
+ return Err((span, "mutable references in const fn are unstable".into()));
+ },
+ ty::Alias(ty::Opaque, ..) => return Err((span, "`impl Trait` in const fn is unstable".into())),
+ ty::FnPtr(..) => {
+ return Err((span, "function pointers in const fn are unstable".into()));
+ },
+ ty::Dynamic(preds, _, _) => {
+ for pred in preds.iter() {
+ match pred.skip_binder() {
+ ty::ExistentialPredicate::AutoTrait(_) | ty::ExistentialPredicate::Projection(_) => {
+ return Err((
+ span,
+ "trait bounds other than `Sized` \
+ on const fn parameters are unstable"
+ .into(),
+ ));
+ },
+ ty::ExistentialPredicate::Trait(trait_ref) => {
+ if Some(trait_ref.def_id) != tcx.lang_items().sized_trait() {
+ return Err((
+ span,
+ "trait bounds other than `Sized` \
+ on const fn parameters are unstable"
+ .into(),
+ ));
+ }
+ },
+ }
+ }
+ },
+ _ => {},
+ }
+ }
+ Ok(())
+}
+
+fn check_rvalue<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ body: &Body<'tcx>,
+ def_id: DefId,
+ rvalue: &Rvalue<'tcx>,
+ span: Span,
+) -> McfResult {
+ match rvalue {
+ Rvalue::ThreadLocalRef(_) => Err((span, "cannot access thread local storage in const fn".into())),
+ Rvalue::Len(place) | Rvalue::Discriminant(place) | Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
+ check_place(tcx, *place, span, body)
+ },
+ Rvalue::CopyForDeref(place) => check_place(tcx, *place, span, body),
+ Rvalue::Repeat(operand, _)
+ | Rvalue::Use(operand)
+ | Rvalue::Cast(
+ CastKind::PointerFromExposedAddress
+ | CastKind::IntToInt
+ | CastKind::FloatToInt
+ | CastKind::IntToFloat
+ | CastKind::FloatToFloat
+ | CastKind::FnPtrToPtr
+ | CastKind::PtrToPtr
+ | CastKind::Pointer(PointerCast::MutToConstPointer | PointerCast::ArrayToPointer),
+ operand,
+ _,
+ ) => check_operand(tcx, operand, span, body),
+ Rvalue::Cast(
+ CastKind::Pointer(
+ PointerCast::UnsafeFnPointer | PointerCast::ClosureFnPointer(_) | PointerCast::ReifyFnPointer,
+ ),
+ _,
+ _,
+ ) => Err((span, "function pointer casts are not allowed in const fn".into())),
+ Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), op, cast_ty) => {
+ let pointee_ty = if let Some(deref_ty) = cast_ty.builtin_deref(true) {
+ deref_ty.ty
+ } else {
+ // We cannot allow this for now.
+ return Err((span, "unsizing casts are only allowed for references right now".into()));
+ };
+ let unsized_ty = tcx.struct_tail_erasing_lifetimes(pointee_ty, tcx.param_env(def_id));
+ if let ty::Slice(_) | ty::Str = unsized_ty.kind() {
+ check_operand(tcx, op, span, body)?;
+ // Casting/coercing things to slices is fine.
+ Ok(())
+ } else {
+ // We just can't allow trait objects until we have figured out trait method calls.
+ Err((span, "unsizing casts are not allowed in const fn".into()))
+ }
+ },
+ Rvalue::Cast(CastKind::PointerExposeAddress, _, _) => {
+ Err((span, "casting pointers to ints is unstable in const fn".into()))
+ },
+ Rvalue::Cast(CastKind::DynStar, _, _) => {
+ // FIXME(dyn-star)
+ unimplemented!()
+ },
+ // binops are fine on integers
+ Rvalue::BinaryOp(_, box (lhs, rhs)) | Rvalue::CheckedBinaryOp(_, box (lhs, rhs)) => {
+ check_operand(tcx, lhs, span, body)?;
+ check_operand(tcx, rhs, span, body)?;
+ let ty = lhs.ty(body, tcx);
+ if ty.is_integral() || ty.is_bool() || ty.is_char() {
+ Ok(())
+ } else {
+ Err((
+ span,
+ "only int, `bool` and `char` operations are stable in const fn".into(),
+ ))
+ }
+ },
+ Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) | Rvalue::ShallowInitBox(_, _) => Ok(()),
+ Rvalue::UnaryOp(_, operand) => {
+ let ty = operand.ty(body, tcx);
+ if ty.is_integral() || ty.is_bool() {
+ check_operand(tcx, operand, span, body)
+ } else {
+ Err((span, "only int and `bool` operations are stable in const fn".into()))
+ }
+ },
+ Rvalue::Aggregate(_, operands) => {
+ for operand in operands {
+ check_operand(tcx, operand, span, body)?;
+ }
+ Ok(())
+ },
+ }
+}
+
+fn check_statement<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ body: &Body<'tcx>,
+ def_id: DefId,
+ statement: &Statement<'tcx>,
+) -> McfResult {
+ let span = statement.source_info.span;
+ match &statement.kind {
+ StatementKind::Assign(box (place, rval)) => {
+ check_place(tcx, *place, span, body)?;
+ check_rvalue(tcx, body, def_id, rval, span)
+ },
+
+ StatementKind::FakeRead(box (_, place)) => check_place(tcx, *place, span, body),
+ // just an assignment
+ StatementKind::SetDiscriminant { place, .. } | StatementKind::Deinit(place) => {
+ check_place(tcx, **place, span, body)
+ },
+
+ StatementKind::Intrinsic(box NonDivergingIntrinsic::Assume(op)) => check_operand(tcx, op, span, body),
+
+ StatementKind::Intrinsic(box NonDivergingIntrinsic::CopyNonOverlapping(
+ rustc_middle::mir::CopyNonOverlapping { dst, src, count },
+ )) => {
+ check_operand(tcx, dst, span, body)?;
+ check_operand(tcx, src, span, body)?;
+ check_operand(tcx, count, span, body)
+ },
+ // These are all NOPs
+ StatementKind::StorageLive(_)
+ | StatementKind::StorageDead(_)
+ | StatementKind::Retag { .. }
+ | StatementKind::AscribeUserType(..)
+ | StatementKind::Coverage(..)
+ | StatementKind::Nop => Ok(()),
+ }
+}
+
+fn check_operand<'tcx>(tcx: TyCtxt<'tcx>, operand: &Operand<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
+ match operand {
+ Operand::Move(place) | Operand::Copy(place) => check_place(tcx, *place, span, body),
+ Operand::Constant(c) => match c.check_static_ptr(tcx) {
+ Some(_) => Err((span, "cannot access `static` items in const fn".into())),
+ None => Ok(()),
+ },
+ }
+}
+
+fn check_place<'tcx>(tcx: TyCtxt<'tcx>, place: Place<'tcx>, span: Span, body: &Body<'tcx>) -> McfResult {
+ let mut cursor = place.projection.as_ref();
+ while let [ref proj_base @ .., elem] = *cursor {
+ cursor = proj_base;
+ match elem {
+ ProjectionElem::Field(..) => {
+ let base_ty = Place::ty_from(place.local, proj_base, body, tcx).ty;
+ if let Some(def) = base_ty.ty_adt_def() {
+ // No union field accesses in `const fn`
+ if def.is_union() {
+ return Err((span, "accessing union fields is unstable".into()));
+ }
+ }
+ },
+ ProjectionElem::ConstantIndex { .. }
+ | ProjectionElem::OpaqueCast(..)
+ | ProjectionElem::Downcast(..)
+ | ProjectionElem::Subslice { .. }
+ | ProjectionElem::Deref
+ | ProjectionElem::Index(_) => {},
+ }
+ }
+
+ Ok(())
+}
+
+fn check_terminator<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ body: &Body<'tcx>,
+ terminator: &Terminator<'tcx>,
+ msrv: &Msrv,
+) -> McfResult {
+ let span = terminator.source_info.span;
+ match &terminator.kind {
+ TerminatorKind::FalseEdge { .. }
+ | TerminatorKind::FalseUnwind { .. }
+ | TerminatorKind::Goto { .. }
+ | TerminatorKind::Return
+ | TerminatorKind::Resume
+ | TerminatorKind::Unreachable => Ok(()),
+
+ TerminatorKind::Drop { place, .. } => check_place(tcx, *place, span, body),
+ TerminatorKind::DropAndReplace { place, value, .. } => {
+ check_place(tcx, *place, span, body)?;
+ check_operand(tcx, value, span, body)
+ },
+
++ TerminatorKind::SwitchInt { discr, targets: _ } => check_operand(tcx, discr, span, body),
+
+ TerminatorKind::Abort => Err((span, "abort is not stable in const fn".into())),
+ TerminatorKind::GeneratorDrop | TerminatorKind::Yield { .. } => {
+ Err((span, "const fn generators are unstable".into()))
+ },
+
+ TerminatorKind::Call {
+ func,
+ args,
+ from_hir_call: _,
+ destination: _,
+ target: _,
+ cleanup: _,
+ fn_span: _,
+ } => {
+ let fn_ty = func.ty(body, tcx);
+ if let ty::FnDef(fn_def_id, _) = *fn_ty.kind() {
+ if !is_const_fn(tcx, fn_def_id, msrv) {
+ return Err((
+ span,
+ format!(
+ "can only call other `const fn` within a `const fn`, \
+ but `{func:?}` is not stable as `const fn`",
+ )
+ .into(),
+ ));
+ }
+
+ // HACK: This is to "unstabilize" the `transmute` intrinsic
+ // within const fns. `transmute` is allowed in all other const contexts.
+ // This won't really scale to more intrinsics or functions. Let's allow const
+ // transmutes in const fn before we add more hacks to this.
+ if tcx.is_intrinsic(fn_def_id) && tcx.item_name(fn_def_id) == sym::transmute {
+ return Err((
+ span,
+ "can only call `transmute` from const items, not `const fn`".into(),
+ ));
+ }
+
+ check_operand(tcx, func, span, body)?;
+
+ for arg in args {
+ check_operand(tcx, arg, span, body)?;
+ }
+ Ok(())
+ } else {
+ Err((span, "can only call other const fns within const fn".into()))
+ }
+ },
+
+ TerminatorKind::Assert {
+ cond,
+ expected: _,
+ msg: _,
+ target: _,
+ cleanup: _,
+ } => check_operand(tcx, cond, span, body),
+
+ TerminatorKind::InlineAsm { .. } => Err((span, "cannot use inline assembly in const fn".into())),
+ }
+}
+
+fn is_const_fn(tcx: TyCtxt<'_>, def_id: DefId, msrv: &Msrv) -> bool {
+ tcx.is_const_fn(def_id)
+ && tcx.lookup_const_stability(def_id).map_or(true, |const_stab| {
+ if let rustc_attr::StabilityLevel::Stable { since, .. } = const_stab.level {
+ // Checking MSRV is manually necessary because `rustc` has no such concept. This entire
+ // function could be removed if `rustc` provided a MSRV-aware version of `is_const_fn`.
+ // as a part of an unimplemented MSRV check https://github.com/rust-lang/rust/issues/65262.
+
+ // HACK(nilstrieb): CURRENT_RUSTC_VERSION can return versions like 1.66.0-dev. `rustc-semver`
+ // doesn't accept the `-dev` version number so we have to strip it
+ // off.
+ let short_version = since
+ .as_str()
+ .split('-')
+ .next()
+ .expect("rustc_attr::StabilityLevel::Stable::since` is empty");
+
+ let since = rustc_span::Symbol::intern(short_version);
+
+ msrv.meets(RustcVersion::parse(since.as_str()).unwrap_or_else(|err| {
+ panic!("`rustc_attr::StabilityLevel::Stable::since` is ill-formatted: `{since}`, {err:?}")
+ }))
+ } else {
+ // Unstable const fn with the feature enabled.
+ msrv.current().is_none()
+ }
+ })
+}
--- /dev/null
- self, AdtDef, AssocKind, Binder, BoundRegion, DefIdTree, FnSig, IntTy, List, ParamEnv, Predicate, PredicateKind,
- AliasTy, Region, RegionKind, SubstsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, UintTy,
+//! Util methods for [`rustc_middle::ty`]
+
+#![allow(clippy::module_name_repetitions)]
+
+use core::ops::ControlFlow;
+use rustc_ast::ast::Mutability;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir as hir;
+use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Expr, FnDecl, LangItem, TyKind, Unsafety};
+use rustc_infer::infer::{
+ type_variable::{TypeVariableOrigin, TypeVariableOriginKind},
+ TyCtxtInferExt,
+};
+use rustc_lint::LateContext;
+use rustc_middle::mir::interpret::{ConstValue, Scalar};
+use rustc_middle::ty::{
- // Checks if the given type implements copy.
++ self, AdtDef, AliasTy, AssocKind, Binder, BoundRegion, DefIdTree, FnSig, IntTy, List, ParamEnv, Predicate,
++ PredicateKind, Region, RegionKind, SubstsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, UintTy,
+ VariantDef, VariantDiscr,
+};
+use rustc_middle::ty::{GenericArg, GenericArgKind};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Span, Symbol, DUMMY_SP};
+use rustc_target::abi::{Size, VariantIdx};
+use rustc_trait_selection::infer::InferCtxtExt;
+use rustc_trait_selection::traits::query::normalize::QueryNormalizeExt;
+use std::iter;
+
+use crate::{match_def_path, path_res, paths};
+
- ty.walk().any(|inner| match inner.unpack() {
- GenericArgKind::Type(inner_ty) => {
- if inner_ty == needle {
- return true;
- }
++/// Checks if the given type implements copy.
+pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ ty.is_copy_modulo_regions(cx.tcx, cx.param_env)
+}
+
+/// This checks whether a given type is known to implement Debug.
+pub fn has_debug_impl<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ cx.tcx
+ .get_diagnostic_item(sym::Debug)
+ .map_or(false, |debug| implements_trait(cx, ty, debug, &[]))
+}
+
+/// Checks whether a type can be partially moved.
+pub fn can_partially_move_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ if has_drop(cx, ty) || is_copy(cx, ty) {
+ return false;
+ }
+ match ty.kind() {
+ ty::Param(_) => false,
+ ty::Adt(def, subs) => def.all_fields().any(|f| !is_copy(cx, f.ty(cx.tcx, subs))),
+ _ => true,
+ }
+}
+
+/// Walks into `ty` and returns `true` if any inner type is an instance of the given adt
+/// constructor.
+pub fn contains_adt_constructor<'tcx>(ty: Ty<'tcx>, adt: AdtDef<'tcx>) -> bool {
+ ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => inner_ty.ty_adt_def() == Some(adt),
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ })
+}
+
+/// Walks into `ty` and returns `true` if any inner type is an instance of the given type, or adt
+/// constructor of the same type.
+///
+/// This method also recurses into opaque type predicates, so call it with `impl Trait<U>` and `U`
+/// will also return `true`.
+pub fn contains_ty_adt_constructor_opaque<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, needle: Ty<'tcx>) -> bool {
- if inner_ty.ty_adt_def() == needle.ty_adt_def() {
- return true;
- }
++ fn contains_ty_adt_constructor_opaque_inner<'tcx>(
++ cx: &LateContext<'tcx>,
++ ty: Ty<'tcx>,
++ needle: Ty<'tcx>,
++ seen: &mut FxHashSet<DefId>,
++ ) -> bool {
++ ty.walk().any(|inner| match inner.unpack() {
++ GenericArgKind::Type(inner_ty) => {
++ if inner_ty == needle {
++ return true;
++ }
+
- if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = *inner_ty.kind() {
- for &(predicate, _span) in cx.tcx.explicit_item_bounds(def_id) {
- match predicate.kind().skip_binder() {
- // For `impl Trait<U>`, it will register a predicate of `T: Trait<U>`, so we go through
- // and check substituions to find `U`.
- ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) => {
- if trait_predicate
- .trait_ref
- .substs
- .types()
- .skip(1) // Skip the implicit `Self` generic parameter
- .any(|ty| contains_ty_adt_constructor_opaque(cx, ty, needle))
- {
- return true;
- }
- },
- // For `impl Trait<Assoc=U>`, it will register a predicate of `<T as Trait>::Assoc = U`,
- // so we check the term for `U`.
- ty::PredicateKind::Clause(ty::Clause::Projection(projection_predicate)) => {
- if let ty::TermKind::Ty(ty) = projection_predicate.term.unpack() {
- if contains_ty_adt_constructor_opaque(cx, ty, needle) {
++ if inner_ty.ty_adt_def() == needle.ty_adt_def() {
++ return true;
++ }
+
- };
- },
- _ => (),
++ if let ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) = *inner_ty.kind() {
++ if !seen.insert(def_id) {
++ return false;
++ }
++
++ for &(predicate, _span) in cx.tcx.explicit_item_bounds(def_id) {
++ match predicate.kind().skip_binder() {
++ // For `impl Trait<U>`, it will register a predicate of `T: Trait<U>`, so we go through
++ // and check substituions to find `U`.
++ ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) => {
++ if trait_predicate
++ .trait_ref
++ .substs
++ .types()
++ .skip(1) // Skip the implicit `Self` generic parameter
++ .any(|ty| contains_ty_adt_constructor_opaque_inner(cx, ty, needle, seen))
++ {
+ return true;
+ }
- }
++ },
++ // For `impl Trait<Assoc=U>`, it will register a predicate of `<T as Trait>::Assoc = U`,
++ // so we check the term for `U`.
++ ty::PredicateKind::Clause(ty::Clause::Projection(projection_predicate)) => {
++ if let ty::TermKind::Ty(ty) = projection_predicate.term.unpack() {
++ if contains_ty_adt_constructor_opaque_inner(cx, ty, needle, seen) {
++ return true;
++ }
++ };
++ },
++ _ => (),
++ }
+ }
+ }
- false
- },
- GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
- })
+
- ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => sig_from_bounds(cx, ty, cx.tcx.item_bounds(def_id), cx.tcx.opt_parent(def_id)),
++ false
++ },
++ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
++ })
++ }
++
++ // A hash set to ensure that the same opaque type (`impl Trait` in RPIT or TAIT) is not
++ // visited twice.
++ let mut seen = FxHashSet::default();
++ contains_ty_adt_constructor_opaque_inner(cx, ty, needle, &mut seen)
+}
+
+/// Resolves `<T as Iterator>::Item` for `T`
+/// Do not invoke without first verifying that the type implements `Iterator`
+pub fn get_iterator_item_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ cx.tcx
+ .get_diagnostic_item(sym::Iterator)
+ .and_then(|iter_did| cx.get_associated_type(ty, iter_did, "Item"))
+}
+
+/// Get the diagnostic name of a type, e.g. `sym::HashMap`. To check if a type
+/// implements a trait marked with a diagnostic item use [`implements_trait`].
+///
+/// For a further exploitation what diagnostic items are see [diagnostic items] in
+/// rustc-dev-guide.
+///
+/// [Diagnostic Items]: https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-items.html
+pub fn get_type_diagnostic_name(cx: &LateContext<'_>, ty: Ty<'_>) -> Option<Symbol> {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.get_diagnostic_name(adt.did()),
+ _ => None,
+ }
+}
+
+/// Returns true if ty has `iter` or `iter_mut` methods
+pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<Symbol> {
+ // FIXME: instead of this hard-coded list, we should check if `<adt>::iter`
+ // exists and has the desired signature. Unfortunately FnCtxt is not exported
+ // so we can't use its `lookup_method` method.
+ let into_iter_collections: &[Symbol] = &[
+ sym::Vec,
+ sym::Option,
+ sym::Result,
+ sym::BTreeMap,
+ sym::BTreeSet,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::BinaryHeap,
+ sym::HashSet,
+ sym::HashMap,
+ sym::PathBuf,
+ sym::Path,
+ sym::Receiver,
+ ];
+
+ let ty_to_check = match probably_ref_ty.kind() {
+ ty::Ref(_, ty_to_check, _) => *ty_to_check,
+ _ => probably_ref_ty,
+ };
+
+ let def_id = match ty_to_check.kind() {
+ ty::Array(..) => return Some(sym::array),
+ ty::Slice(..) => return Some(sym::slice),
+ ty::Adt(adt, _) => adt.did(),
+ _ => return None,
+ };
+
+ for &name in into_iter_collections {
+ if cx.tcx.is_diagnostic_item(name, def_id) {
+ return Some(cx.tcx.item_name(def_id));
+ }
+ }
+ None
+}
+
+/// Checks whether a type implements a trait.
+/// The function returns false in case the type contains an inference variable.
+///
+/// See:
+/// * [`get_trait_def_id`](super::get_trait_def_id) to get a trait [`DefId`].
+/// * [Common tools for writing lints] for an example how to use this function and other options.
+///
+/// [Common tools for writing lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/common_tools_writing_lints.md#checking-if-a-type-implements-a-specific-trait
+pub fn implements_trait<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ ty_params: &[GenericArg<'tcx>],
+) -> bool {
+ implements_trait_with_env(
+ cx.tcx,
+ cx.param_env,
+ ty,
+ trait_id,
+ ty_params.iter().map(|&arg| Some(arg)),
+ )
+}
+
+/// Same as `implements_trait` but allows using a `ParamEnv` different from the lint context.
+pub fn implements_trait_with_env<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ param_env: ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ ty_params: impl IntoIterator<Item = Option<GenericArg<'tcx>>>,
+) -> bool {
+ // Clippy shouldn't have infer types
+ assert!(!ty.needs_infer());
+
+ let ty = tcx.erase_regions(ty);
+ if ty.has_escaping_bound_vars() {
+ return false;
+ }
+ let infcx = tcx.infer_ctxt().build();
+ let orig = TypeVariableOrigin {
+ kind: TypeVariableOriginKind::MiscVariable,
+ span: DUMMY_SP,
+ };
+ let ty_params = tcx.mk_substs(
+ ty_params
+ .into_iter()
+ .map(|arg| arg.unwrap_or_else(|| infcx.next_ty_var(orig).into())),
+ );
+ infcx
+ .type_implements_trait(trait_id, [ty.into()].into_iter().chain(ty_params), param_env)
+ .must_apply_modulo_regions()
+}
+
+/// Checks whether this type implements `Drop`.
+pub fn has_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.ty_adt_def() {
+ Some(def) => def.has_dtor(cx.tcx),
+ None => false,
+ }
+}
+
+// Returns whether the type has #[must_use] attribute
+pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.has_attr(adt.did(), sym::must_use),
+ ty::Foreign(did) => cx.tcx.has_attr(*did, sym::must_use),
+ ty::Slice(ty) | ty::Array(ty, _) | ty::RawPtr(ty::TypeAndMut { ty, .. }) | ty::Ref(_, ty, _) => {
+ // for the Array case we don't need to care for the len == 0 case
+ // because we don't want to lint functions returning empty arrays
+ is_must_use_ty(cx, *ty)
+ },
+ ty::Tuple(substs) => substs.iter().any(|ty| is_must_use_ty(cx, ty)),
+ ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => {
+ for (predicate, _) in cx.tcx.explicit_item_bounds(*def_id) {
+ if let ty::PredicateKind::Clause(ty::Clause::Trait(trait_predicate)) = predicate.kind().skip_binder() {
+ if cx.tcx.has_attr(trait_predicate.trait_ref.def_id, sym::must_use) {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ ty::Dynamic(binder, _, _) => {
+ for predicate in binder.iter() {
+ if let ty::ExistentialPredicate::Trait(ref trait_ref) = predicate.skip_binder() {
+ if cx.tcx.has_attr(trait_ref.def_id, sym::must_use) {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ _ => false,
+ }
+}
+
+// FIXME: Per https://doc.rust-lang.org/nightly/nightly-rustc/rustc_trait_selection/infer/at/struct.At.html#method.normalize
+// this function can be removed once the `normalize` method does not panic when normalization does
+// not succeed
+/// Checks if `Ty` is normalizable. This function is useful
+/// to avoid crashes on `layout_of`.
+pub fn is_normalizable<'tcx>(cx: &LateContext<'tcx>, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
+ is_normalizable_helper(cx, param_env, ty, &mut FxHashMap::default())
+}
+
+fn is_normalizable_helper<'tcx>(
+ cx: &LateContext<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ cache: &mut FxHashMap<Ty<'tcx>, bool>,
+) -> bool {
+ if let Some(&cached_result) = cache.get(&ty) {
+ return cached_result;
+ }
+ // prevent recursive loops, false-negative is better than endless loop leading to stack overflow
+ cache.insert(ty, false);
+ let infcx = cx.tcx.infer_ctxt().build();
+ let cause = rustc_middle::traits::ObligationCause::dummy();
+ let result = if infcx.at(&cause, param_env).query_normalize(ty).is_ok() {
+ match ty.kind() {
+ ty::Adt(def, substs) => def.variants().iter().all(|variant| {
+ variant
+ .fields
+ .iter()
+ .all(|field| is_normalizable_helper(cx, param_env, field.ty(cx.tcx, substs), cache))
+ }),
+ _ => ty.walk().all(|generic_arg| match generic_arg.unpack() {
+ GenericArgKind::Type(inner_ty) if inner_ty != ty => {
+ is_normalizable_helper(cx, param_env, inner_ty, cache)
+ },
+ _ => true, // if inner_ty == ty, we've already checked it
+ }),
+ }
+ } else {
+ false
+ };
+ cache.insert(ty, result);
+ result
+}
+
+/// Returns `true` if the given type is a non aggregate primitive (a `bool` or `char`, any
+/// integer or floating-point number type). For checking aggregation of primitive types (e.g.
+/// tuples and slices of primitive type) see `is_recursively_primitive_type`
+pub fn is_non_aggregate_primitive_type(ty: Ty<'_>) -> bool {
+ matches!(ty.kind(), ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_))
+}
+
+/// Returns `true` if the given type is a primitive (a `bool` or `char`, any integer or
+/// floating-point number type, a `str`, or an array, slice, or tuple of those types).
+pub fn is_recursively_primitive_type(ty: Ty<'_>) -> bool {
+ match *ty.kind() {
+ ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str => true,
+ ty::Ref(_, inner, _) if *inner.kind() == ty::Str => true,
+ ty::Array(inner_type, _) | ty::Slice(inner_type) => is_recursively_primitive_type(inner_type),
+ ty::Tuple(inner_types) => inner_types.iter().all(is_recursively_primitive_type),
+ _ => false,
+ }
+}
+
+/// Checks if the type is a reference equals to a diagnostic item
+pub fn is_type_ref_to_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Ref(_, ref_ty, _) => match ref_ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did()),
+ _ => false,
+ },
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a diagnostic item. To check if a type implements a
+/// trait marked with a diagnostic item use [`implements_trait`].
+///
+/// For a further exploitation what diagnostic items are see [diagnostic items] in
+/// rustc-dev-guide.
+///
+/// ---
+///
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+///
+/// [Diagnostic Items]: https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-items.html
+pub fn is_type_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did()),
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a lang item.
+///
+/// Returns `false` if the `LangItem` is not defined.
+pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: hir::LangItem) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.lang_items().get(lang_item) == Some(adt.did()),
+ _ => false,
+ }
+}
+
+/// Return `true` if the passed `typ` is `isize` or `usize`.
+pub fn is_isize_or_usize(typ: Ty<'_>) -> bool {
+ matches!(typ.kind(), ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize))
+}
+
+/// Checks if type is struct, enum or union type with the given def path.
+///
+/// If the type is a diagnostic item, use `is_type_diagnostic_item` instead.
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+pub fn match_type(cx: &LateContext<'_>, ty: Ty<'_>, path: &[&str]) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => match_def_path(cx, adt.did(), path),
+ _ => false,
+ }
+}
+
+/// Checks if the drop order for a type matters. Some std types implement drop solely to
+/// deallocate memory. For these types, and composites containing them, changing the drop order
+/// won't result in any observable side effects.
+pub fn needs_ordered_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ fn needs_ordered_drop_inner<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, seen: &mut FxHashSet<Ty<'tcx>>) -> bool {
+ if !seen.insert(ty) {
+ return false;
+ }
+ if !ty.has_significant_drop(cx.tcx, cx.param_env) {
+ false
+ }
+ // Check for std types which implement drop, but only for memory allocation.
+ else if is_type_lang_item(cx, ty, LangItem::OwnedBox)
+ || matches!(
+ get_type_diagnostic_name(cx, ty),
+ Some(sym::HashSet | sym::Rc | sym::Arc | sym::cstring_type)
+ )
+ || match_type(cx, ty, &paths::WEAK_RC)
+ || match_type(cx, ty, &paths::WEAK_ARC)
+ {
+ // Check all of the generic arguments.
+ if let ty::Adt(_, subs) = ty.kind() {
+ subs.types().any(|ty| needs_ordered_drop_inner(cx, ty, seen))
+ } else {
+ true
+ }
+ } else if !cx
+ .tcx
+ .lang_items()
+ .drop_trait()
+ .map_or(false, |id| implements_trait(cx, ty, id, &[]))
+ {
+ // This type doesn't implement drop, so no side effects here.
+ // Check if any component type has any.
+ match ty.kind() {
+ ty::Tuple(fields) => fields.iter().any(|ty| needs_ordered_drop_inner(cx, ty, seen)),
+ ty::Array(ty, _) => needs_ordered_drop_inner(cx, *ty, seen),
+ ty::Adt(adt, subs) => adt
+ .all_fields()
+ .map(|f| f.ty(cx.tcx, subs))
+ .any(|ty| needs_ordered_drop_inner(cx, ty, seen)),
+ _ => true,
+ }
+ } else {
+ true
+ }
+ }
+
+ needs_ordered_drop_inner(cx, ty, &mut FxHashSet::default())
+}
+
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_mid_ty_refs(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn peel(ty: Ty<'_>, count: usize) -> (Ty<'_>, usize) {
+ if let ty::Ref(_, ty, _) = ty.kind() {
+ peel(*ty, count + 1)
+ } else {
+ (ty, count)
+ }
+ }
+ peel(ty, 0)
+}
+
+/// Peels off all references on the type. Returns the underlying type, the number of references
+/// removed, and whether the pointer is ultimately mutable or not.
+pub fn peel_mid_ty_refs_is_mutable(ty: Ty<'_>) -> (Ty<'_>, usize, Mutability) {
+ fn f(ty: Ty<'_>, count: usize, mutability: Mutability) -> (Ty<'_>, usize, Mutability) {
+ match ty.kind() {
+ ty::Ref(_, ty, Mutability::Mut) => f(*ty, count + 1, mutability),
+ ty::Ref(_, ty, Mutability::Not) => f(*ty, count + 1, Mutability::Not),
+ _ => (ty, count, mutability),
+ }
+ }
+ f(ty, 0, Mutability::Mut)
+}
+
+/// Returns `true` if the given type is an `unsafe` function.
+pub fn type_is_unsafe_function<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::FnDef(..) | ty::FnPtr(_) => ty.fn_sig(cx.tcx).unsafety() == Unsafety::Unsafe,
+ _ => false,
+ }
+}
+
+/// Returns the base type for HIR references and pointers.
+pub fn walk_ptrs_hir_ty<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
+ match ty.kind {
+ TyKind::Ptr(ref mut_ty) | TyKind::Rptr(_, ref mut_ty) => walk_ptrs_hir_ty(mut_ty.ty),
+ _ => ty,
+ }
+}
+
+/// Returns the base type for references and raw pointers, and count reference
+/// depth.
+pub fn walk_ptrs_ty_depth(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn inner(ty: Ty<'_>, depth: usize) -> (Ty<'_>, usize) {
+ match ty.kind() {
+ ty::Ref(_, ty, _) => inner(*ty, depth + 1),
+ _ => (ty, depth),
+ }
+ }
+ inner(ty, 0)
+}
+
+/// Returns `true` if types `a` and `b` are same types having same `Const` generic args,
+/// otherwise returns `false`
+pub fn same_type_and_consts<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
+ match (&a.kind(), &b.kind()) {
+ (&ty::Adt(did_a, substs_a), &ty::Adt(did_b, substs_b)) => {
+ if did_a != did_b {
+ return false;
+ }
+
+ substs_a
+ .iter()
+ .zip(substs_b.iter())
+ .all(|(arg_a, arg_b)| match (arg_a.unpack(), arg_b.unpack()) {
+ (GenericArgKind::Const(inner_a), GenericArgKind::Const(inner_b)) => inner_a == inner_b,
+ (GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => {
+ same_type_and_consts(type_a, type_b)
+ },
+ _ => true,
+ })
+ },
+ _ => a == b,
+ }
+}
+
+/// Checks if a given type looks safe to be uninitialized.
+pub fn is_uninit_value_valid_for_ty(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ match *ty.kind() {
+ ty::Array(component, _) => is_uninit_value_valid_for_ty(cx, component),
+ ty::Tuple(types) => types.iter().all(|ty| is_uninit_value_valid_for_ty(cx, ty)),
+ ty::Adt(adt, _) => cx.tcx.lang_items().maybe_uninit() == Some(adt.did()),
+ _ => false,
+ }
+}
+
+/// Gets an iterator over all predicates which apply to the given item.
+pub fn all_predicates_of(tcx: TyCtxt<'_>, id: DefId) -> impl Iterator<Item = &(Predicate<'_>, Span)> {
+ let mut next_id = Some(id);
+ iter::from_fn(move || {
+ next_id.take().map(|id| {
+ let preds = tcx.predicates_of(id);
+ next_id = preds.parent;
+ preds.predicates.iter()
+ })
+ })
+ .flatten()
+}
+
+/// A signature for a function like type.
+#[derive(Clone, Copy)]
+pub enum ExprFnSig<'tcx> {
+ Sig(Binder<'tcx, FnSig<'tcx>>, Option<DefId>),
+ Closure(Option<&'tcx FnDecl<'tcx>>, Binder<'tcx, FnSig<'tcx>>),
+ Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>, Option<DefId>),
+}
+impl<'tcx> ExprFnSig<'tcx> {
+ /// Gets the argument type at the given offset. This will return `None` when the index is out of
+ /// bounds only for variadic functions, otherwise this will panic.
+ pub fn input(self, i: usize) -> Option<Binder<'tcx, Ty<'tcx>>> {
+ match self {
+ Self::Sig(sig, _) => {
+ if sig.c_variadic() {
+ sig.inputs().map_bound(|inputs| inputs.get(i).copied()).transpose()
+ } else {
+ Some(sig.input(i))
+ }
+ },
+ Self::Closure(_, sig) => Some(sig.input(0).map_bound(|ty| ty.tuple_fields()[i])),
+ Self::Trait(inputs, _, _) => Some(inputs.map_bound(|ty| ty.tuple_fields()[i])),
+ }
+ }
+
+ /// Gets the argument type at the given offset. For closures this will also get the type as
+ /// written. This will return `None` when the index is out of bounds only for variadic
+ /// functions, otherwise this will panic.
+ pub fn input_with_hir(self, i: usize) -> Option<(Option<&'tcx hir::Ty<'tcx>>, Binder<'tcx, Ty<'tcx>>)> {
+ match self {
+ Self::Sig(sig, _) => {
+ if sig.c_variadic() {
+ sig.inputs()
+ .map_bound(|inputs| inputs.get(i).copied())
+ .transpose()
+ .map(|arg| (None, arg))
+ } else {
+ Some((None, sig.input(i)))
+ }
+ },
+ Self::Closure(decl, sig) => Some((
+ decl.and_then(|decl| decl.inputs.get(i)),
+ sig.input(0).map_bound(|ty| ty.tuple_fields()[i]),
+ )),
+ Self::Trait(inputs, _, _) => Some((None, inputs.map_bound(|ty| ty.tuple_fields()[i]))),
+ }
+ }
+
+ /// Gets the result type, if one could be found. Note that the result type of a trait may not be
+ /// specified.
+ pub fn output(self) -> Option<Binder<'tcx, Ty<'tcx>>> {
+ match self {
+ Self::Sig(sig, _) | Self::Closure(_, sig) => Some(sig.output()),
+ Self::Trait(_, output, _) => output,
+ }
+ }
+
+ pub fn predicates_id(&self) -> Option<DefId> {
+ if let ExprFnSig::Sig(_, id) | ExprFnSig::Trait(_, _, id) = *self {
+ id
+ } else {
+ None
+ }
+ }
+}
+
+/// If the expression is function like, get the signature for it.
+pub fn expr_sig<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> Option<ExprFnSig<'tcx>> {
+ if let Res::Def(DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::AssocFn, id) = path_res(cx, expr) {
+ Some(ExprFnSig::Sig(cx.tcx.fn_sig(id), Some(id)))
+ } else {
+ ty_sig(cx, cx.typeck_results().expr_ty_adjusted(expr).peel_refs())
+ }
+}
+
+/// If the type is function like, get the signature for it.
+pub fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'tcx>> {
+ if ty.is_box() {
+ return ty_sig(cx, ty.boxed_ty());
+ }
+ match *ty.kind() {
+ ty::Closure(id, subs) => {
+ let decl = id
+ .as_local()
+ .and_then(|id| cx.tcx.hir().fn_decl_by_hir_id(cx.tcx.hir().local_def_id_to_hir_id(id)));
+ Some(ExprFnSig::Closure(decl, subs.as_closure().sig()))
+ },
+ ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.bound_fn_sig(id).subst(cx.tcx, subs), Some(id))),
- if Some(p.projection_ty.def_id) == lang_items.fn_once_output()
- && p.projection_ty.self_ty() == ty =>
++ ty::Alias(ty::Opaque, ty::AliasTy { def_id, .. }) => {
++ sig_from_bounds(cx, ty, cx.tcx.item_bounds(def_id), cx.tcx.opt_parent(def_id))
++ },
+ ty::FnPtr(sig) => Some(ExprFnSig::Sig(sig, None)),
+ ty::Dynamic(bounds, _, _) => {
+ let lang_items = cx.tcx.lang_items();
+ match bounds.principal() {
+ Some(bound)
+ if Some(bound.def_id()) == lang_items.fn_trait()
+ || Some(bound.def_id()) == lang_items.fn_once_trait()
+ || Some(bound.def_id()) == lang_items.fn_mut_trait() =>
+ {
+ let output = bounds
+ .projection_bounds()
+ .find(|p| lang_items.fn_once_output().map_or(false, |id| id == p.item_def_id()))
+ .map(|p| p.map_bound(|p| p.term.ty().unwrap()));
+ Some(ExprFnSig::Trait(bound.map_bound(|b| b.substs.type_at(0)), output, None))
+ },
+ _ => None,
+ }
+ },
+ ty::Alias(ty::Projection, proj) => match cx.tcx.try_normalize_erasing_regions(cx.param_env, ty) {
+ Ok(normalized_ty) if normalized_ty != ty => ty_sig(cx, normalized_ty),
+ _ => sig_for_projection(cx, proj).or_else(|| sig_from_bounds(cx, ty, cx.param_env.caller_bounds(), None)),
+ },
+ ty::Param(_) => sig_from_bounds(cx, ty, cx.param_env.caller_bounds(), None),
+ _ => None,
+ }
+}
+
+fn sig_from_bounds<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ predicates: &'tcx [Predicate<'tcx>],
+ predicates_id: Option<DefId>,
+) -> Option<ExprFnSig<'tcx>> {
+ let mut inputs = None;
+ let mut output = None;
+ let lang_items = cx.tcx.lang_items();
+
+ for pred in predicates {
+ match pred.kind().skip_binder() {
+ PredicateKind::Clause(ty::Clause::Trait(p))
+ if (lang_items.fn_trait() == Some(p.def_id())
+ || lang_items.fn_mut_trait() == Some(p.def_id())
+ || lang_items.fn_once_trait() == Some(p.def_id()))
+ && p.self_ty() == ty =>
+ {
+ let i = pred.kind().rebind(p.trait_ref.substs.type_at(1));
+ if inputs.map_or(false, |inputs| i != inputs) {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ inputs = Some(i);
+ },
+ PredicateKind::Clause(ty::Clause::Projection(p))
- Some(tcx.mk_alias_ty(
- assoc_item.def_id,
- substs,
- ))
++ if Some(p.projection_ty.def_id) == lang_items.fn_once_output() && p.projection_ty.self_ty() == ty =>
+ {
+ if output.is_some() {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ output = Some(pred.kind().rebind(p.term.ty().unwrap()));
+ },
+ _ => (),
+ }
+ }
+
+ inputs.map(|ty| ExprFnSig::Trait(ty, output, predicates_id))
+}
+
+fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: AliasTy<'tcx>) -> Option<ExprFnSig<'tcx>> {
+ let mut inputs = None;
+ let mut output = None;
+ let lang_items = cx.tcx.lang_items();
+
+ for (pred, _) in cx
+ .tcx
+ .bound_explicit_item_bounds(ty.def_id)
+ .subst_iter_copied(cx.tcx, ty.substs)
+ {
+ match pred.kind().skip_binder() {
+ PredicateKind::Clause(ty::Clause::Trait(p))
+ if (lang_items.fn_trait() == Some(p.def_id())
+ || lang_items.fn_mut_trait() == Some(p.def_id())
+ || lang_items.fn_once_trait() == Some(p.def_id())) =>
+ {
+ let i = pred.kind().rebind(p.trait_ref.substs.type_at(1));
+
+ if inputs.map_or(false, |inputs| inputs != i) {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ inputs = Some(i);
+ },
+ PredicateKind::Clause(ty::Clause::Projection(p))
+ if Some(p.projection_ty.def_id) == lang_items.fn_once_output() =>
+ {
+ if output.is_some() {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ output = pred.kind().rebind(p.term.ty()).transpose();
+ },
+ _ => (),
+ }
+ }
+
+ inputs.map(|ty| ExprFnSig::Trait(ty, output, None))
+}
+
+#[derive(Clone, Copy)]
+pub enum EnumValue {
+ Unsigned(u128),
+ Signed(i128),
+}
+impl core::ops::Add<u32> for EnumValue {
+ type Output = Self;
+ fn add(self, n: u32) -> Self::Output {
+ match self {
+ Self::Unsigned(x) => Self::Unsigned(x + u128::from(n)),
+ Self::Signed(x) => Self::Signed(x + i128::from(n)),
+ }
+ }
+}
+
+/// Attempts to read the given constant as though it were an enum value.
+#[expect(clippy::cast_possible_truncation, clippy::cast_possible_wrap)]
+pub fn read_explicit_enum_value(tcx: TyCtxt<'_>, id: DefId) -> Option<EnumValue> {
+ if let Ok(ConstValue::Scalar(Scalar::Int(value))) = tcx.const_eval_poly(id) {
+ match tcx.type_of(id).kind() {
+ ty::Int(_) => Some(EnumValue::Signed(match value.size().bytes() {
+ 1 => i128::from(value.assert_bits(Size::from_bytes(1)) as u8 as i8),
+ 2 => i128::from(value.assert_bits(Size::from_bytes(2)) as u16 as i16),
+ 4 => i128::from(value.assert_bits(Size::from_bytes(4)) as u32 as i32),
+ 8 => i128::from(value.assert_bits(Size::from_bytes(8)) as u64 as i64),
+ 16 => value.assert_bits(Size::from_bytes(16)) as i128,
+ _ => return None,
+ })),
+ ty::Uint(_) => Some(EnumValue::Unsigned(match value.size().bytes() {
+ 1 => value.assert_bits(Size::from_bytes(1)),
+ 2 => value.assert_bits(Size::from_bytes(2)),
+ 4 => value.assert_bits(Size::from_bytes(4)),
+ 8 => value.assert_bits(Size::from_bytes(8)),
+ 16 => value.assert_bits(Size::from_bytes(16)),
+ _ => return None,
+ })),
+ _ => None,
+ }
+ } else {
+ None
+ }
+}
+
+/// Gets the value of the given variant.
+pub fn get_discriminant_value(tcx: TyCtxt<'_>, adt: AdtDef<'_>, i: VariantIdx) -> EnumValue {
+ let variant = &adt.variant(i);
+ match variant.discr {
+ VariantDiscr::Explicit(id) => read_explicit_enum_value(tcx, id).unwrap(),
+ VariantDiscr::Relative(x) => match adt.variant((i.as_usize() - x as usize).into()).discr {
+ VariantDiscr::Explicit(id) => read_explicit_enum_value(tcx, id).unwrap() + x,
+ VariantDiscr::Relative(_) => EnumValue::Unsigned(x.into()),
+ },
+ }
+}
+
+/// Check if the given type is either `core::ffi::c_void`, `std::os::raw::c_void`, or one of the
+/// platform specific `libc::<platform>::c_void` types in libc.
+pub fn is_c_void(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ if let ty::Adt(adt, _) = ty.kind()
+ && let &[krate, .., name] = &*cx.get_def_path(adt.did())
+ && let sym::libc | sym::core | sym::std = krate
+ && name.as_str() == "c_void"
+ {
+ true
+ } else {
+ false
+ }
+}
+
+pub fn for_each_top_level_late_bound_region<B>(
+ ty: Ty<'_>,
+ f: impl FnMut(BoundRegion) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ struct V<F> {
+ index: u32,
+ f: F,
+ }
+ impl<'tcx, B, F: FnMut(BoundRegion) -> ControlFlow<B>> TypeVisitor<'tcx> for V<F> {
+ type BreakTy = B;
+ fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> {
+ if let RegionKind::ReLateBound(idx, bound) = r.kind() && idx.as_u32() == self.index {
+ (self.f)(bound)
+ } else {
+ ControlFlow::Continue(())
+ }
+ }
+ fn visit_binder<T: TypeVisitable<'tcx>>(&mut self, t: &Binder<'tcx, T>) -> ControlFlow<Self::BreakTy> {
+ self.index += 1;
+ let res = t.super_visit_with(self);
+ self.index -= 1;
+ res
+ }
+ }
+ ty.visit_with(&mut V { index: 0, f })
+}
+
+pub struct AdtVariantInfo {
+ pub ind: usize,
+ pub size: u64,
+
+ /// (ind, size)
+ pub fields_size: Vec<(usize, u64)>,
+}
+
+impl AdtVariantInfo {
+ /// Returns ADT variants ordered by size
+ pub fn new<'tcx>(cx: &LateContext<'tcx>, adt: AdtDef<'tcx>, subst: &'tcx List<GenericArg<'tcx>>) -> Vec<Self> {
+ let mut variants_size = adt
+ .variants()
+ .iter()
+ .enumerate()
+ .map(|(i, variant)| {
+ let mut fields_size = variant
+ .fields
+ .iter()
+ .enumerate()
+ .map(|(i, f)| (i, approx_ty_size(cx, f.ty(cx.tcx, subst))))
+ .collect::<Vec<_>>();
+ fields_size.sort_by(|(_, a_size), (_, b_size)| (a_size.cmp(b_size)));
+
+ Self {
+ ind: i,
+ size: fields_size.iter().map(|(_, size)| size).sum(),
+ fields_size,
+ }
+ })
+ .collect::<Vec<_>>();
+ variants_size.sort_by(|a, b| (b.size.cmp(&a.size)));
+ variants_size
+ }
+}
+
+/// Gets the struct or enum variant from the given `Res`
+pub fn variant_of_res<'tcx>(cx: &LateContext<'tcx>, res: Res) -> Option<&'tcx VariantDef> {
+ match res {
+ Res::Def(DefKind::Struct, id) => Some(cx.tcx.adt_def(id).non_enum_variant()),
+ Res::Def(DefKind::Variant, id) => Some(cx.tcx.adt_def(cx.tcx.parent(id)).variant_with_id(id)),
+ Res::Def(DefKind::Ctor(CtorOf::Struct, _), id) => Some(cx.tcx.adt_def(cx.tcx.parent(id)).non_enum_variant()),
+ Res::Def(DefKind::Ctor(CtorOf::Variant, _), id) => {
+ let var_id = cx.tcx.parent(id);
+ Some(cx.tcx.adt_def(cx.tcx.parent(var_id)).variant_with_id(var_id))
+ },
+ Res::SelfCtor(id) => Some(cx.tcx.type_of(id).ty_adt_def().unwrap().non_enum_variant()),
+ _ => None,
+ }
+}
+
+/// Checks if the type is a type parameter implementing `FnOnce`, but not `FnMut`.
+pub fn ty_is_fn_once_param<'tcx>(tcx: TyCtxt<'_>, ty: Ty<'tcx>, predicates: &'tcx [Predicate<'_>]) -> bool {
+ let ty::Param(ty) = *ty.kind() else {
+ return false;
+ };
+ let lang = tcx.lang_items();
+ let (Some(fn_once_id), Some(fn_mut_id), Some(fn_id))
+ = (lang.fn_once_trait(), lang.fn_mut_trait(), lang.fn_trait())
+ else {
+ return false;
+ };
+ predicates
+ .iter()
+ .try_fold(false, |found, p| {
+ if let PredicateKind::Clause(ty::Clause::Trait(p)) = p.kind().skip_binder()
+ && let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
+ && ty.index == self_ty.index
+ {
+ // This should use `super_traits_of`, but that's a private function.
+ if p.trait_ref.def_id == fn_once_id {
+ return Some(true);
+ } else if p.trait_ref.def_id == fn_mut_id || p.trait_ref.def_id == fn_id {
+ return None;
+ }
+ }
+ Some(found)
+ })
+ .unwrap_or(false)
+}
+
+/// Comes up with an "at least" guesstimate for the type's size, not taking into
+/// account the layout of type parameters.
+pub fn approx_ty_size<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> u64 {
+ use rustc_middle::ty::layout::LayoutOf;
+ if !is_normalizable(cx, cx.param_env, ty) {
+ return 0;
+ }
+ match (cx.layout_of(ty).map(|layout| layout.size.bytes()), ty.kind()) {
+ (Ok(size), _) => size,
+ (Err(_), ty::Tuple(list)) => list.as_substs().types().map(|t| approx_ty_size(cx, t)).sum(),
+ (Err(_), ty::Array(t, n)) => {
+ n.try_eval_usize(cx.tcx, cx.param_env).unwrap_or_default() * approx_ty_size(cx, *t)
+ },
+ (Err(_), ty::Adt(def, subst)) if def.is_struct() => def
+ .variants()
+ .iter()
+ .map(|v| {
+ v.fields
+ .iter()
+ .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst)))
+ .sum::<u64>()
+ })
+ .sum(),
+ (Err(_), ty::Adt(def, subst)) if def.is_enum() => def
+ .variants()
+ .iter()
+ .map(|v| {
+ v.fields
+ .iter()
+ .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst)))
+ .sum::<u64>()
+ })
+ .max()
+ .unwrap_or_default(),
+ (Err(_), ty::Adt(def, subst)) if def.is_union() => def
+ .variants()
+ .iter()
+ .map(|v| {
+ v.fields
+ .iter()
+ .map(|field| approx_ty_size(cx, field.ty(cx.tcx, subst)))
+ .max()
+ .unwrap_or_default()
+ })
+ .max()
+ .unwrap_or_default(),
+ (Err(_), _) => 0,
+ }
+}
+
+/// Makes the projection type for the named associated type in the given impl or trait impl.
+///
+/// This function is for associated types which are "known" to exist, and as such, will only return
+/// `None` when debug assertions are disabled in order to prevent ICE's. With debug assertions
+/// enabled this will check that the named associated type exists, the correct number of
+/// substitutions are given, and that the correct kinds of substitutions are given (lifetime,
+/// constant or type). This will not check if type normalization would succeed.
+pub fn make_projection<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ container_id: DefId,
+ assoc_ty: Symbol,
+ substs: impl IntoIterator<Item = impl Into<GenericArg<'tcx>>>,
+) -> Option<AliasTy<'tcx>> {
+ fn helper<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ container_id: DefId,
+ assoc_ty: Symbol,
+ substs: SubstsRef<'tcx>,
+ ) -> Option<AliasTy<'tcx>> {
+ let Some(assoc_item) = tcx
+ .associated_items(container_id)
+ .find_by_name_and_kind(tcx, Ident::with_dummy_span(assoc_ty), AssocKind::Type, container_id)
+ else {
+ debug_assert!(false, "type `{assoc_ty}` not found in `{container_id:?}`");
+ return None;
+ };
+ #[cfg(debug_assertions)]
+ {
+ let generics = tcx.generics_of(assoc_item.def_id);
+ let generic_count = generics.parent_count + generics.params.len();
+ let params = generics
+ .parent
+ .map_or([].as_slice(), |id| &*tcx.generics_of(id).params)
+ .iter()
+ .chain(&generics.params)
+ .map(|x| &x.kind);
+
+ debug_assert!(
+ generic_count == substs.len(),
+ "wrong number of substs for `{:?}`: found `{}` expected `{generic_count}`.\n\
+ note: the expected parameters are: {:#?}\n\
+ the given arguments are: `{substs:#?}`",
+ assoc_item.def_id,
+ substs.len(),
+ params.map(ty::GenericParamDefKind::descr).collect::<Vec<_>>(),
+ );
+
+ if let Some((idx, (param, arg))) = params
+ .clone()
+ .zip(substs.iter().map(GenericArg::unpack))
+ .enumerate()
+ .find(|(_, (param, arg))| {
+ !matches!(
+ (param, arg),
+ (ty::GenericParamDefKind::Lifetime, GenericArgKind::Lifetime(_))
+ | (ty::GenericParamDefKind::Type { .. }, GenericArgKind::Type(_))
+ | (ty::GenericParamDefKind::Const { .. }, GenericArgKind::Const(_))
+ )
+ })
+ {
+ debug_assert!(
+ false,
+ "mismatched subst type at index {idx}: expected a {}, found `{arg:?}`\n\
+ note: the expected parameters are {:#?}\n\
+ the given arguments are {substs:#?}",
+ param.descr(),
+ params.map(ty::GenericParamDefKind::descr).collect::<Vec<_>>()
+ );
+ }
+ }
+
++ Some(tcx.mk_alias_ty(assoc_item.def_id, substs))
+ }
+ helper(
+ tcx,
+ container_id,
+ assoc_ty,
+ tcx.mk_substs(substs.into_iter().map(Into::into)),
+ )
+}
+
+/// Normalizes the named associated type in the given impl or trait impl.
+///
+/// This function is for associated types which are "known" to be valid with the given
+/// substitutions, and as such, will only return `None` when debug assertions are disabled in order
+/// to prevent ICE's. With debug assertions enabled this will check that that type normalization
+/// succeeds as well as everything checked by `make_projection`.
+pub fn make_normalized_projection<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ param_env: ParamEnv<'tcx>,
+ container_id: DefId,
+ assoc_ty: Symbol,
+ substs: impl IntoIterator<Item = impl Into<GenericArg<'tcx>>>,
+) -> Option<Ty<'tcx>> {
+ fn helper<'tcx>(tcx: TyCtxt<'tcx>, param_env: ParamEnv<'tcx>, ty: AliasTy<'tcx>) -> Option<Ty<'tcx>> {
+ #[cfg(debug_assertions)]
+ if let Some((i, subst)) = ty
+ .substs
+ .iter()
+ .enumerate()
+ .find(|(_, subst)| subst.has_late_bound_regions())
+ {
+ debug_assert!(
+ false,
+ "substs contain late-bound region at index `{i}` which can't be normalized.\n\
+ use `TyCtxt::erase_late_bound_regions`\n\
+ note: subst is `{subst:#?}`",
+ );
+ return None;
+ }
+ match tcx.try_normalize_erasing_regions(param_env, tcx.mk_projection(ty.def_id, ty.substs)) {
+ Ok(ty) => Some(ty),
+ Err(e) => {
+ debug_assert!(false, "failed to normalize type `{ty}`: {e:#?}");
+ None
+ },
+ }
+ }
+ helper(tcx, param_env, make_projection(tcx, container_id, assoc_ty, substs)?)
+}
--- /dev/null
- version = "0.1.67"
+[package]
+name = "declare_clippy_lint"
++version = "0.1.68"
+edition = "2021"
+publish = false
+
+[lib]
+proc-macro = true
+
+[dependencies]
+itertools = "0.10.1"
+quote = "1.0.21"
+syn = "1.0.100"
+
+[features]
+deny-warnings = []
--- /dev/null
- channel = "nightly-2022-12-01"
+[toolchain]
++channel = "nightly-2022-12-17"
+components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
--- /dev/null
++# Changelog
++
++## Version 0.3.0
++
++* Added `setup_version_info!();` macro for automated scripts.
++* `get_version_info!()` no longer requires the user to import `rustc_tools_util::VersionInfo` and `std::env`
--- /dev/null
- version = "0.2.1"
+[package]
+name = "rustc_tools_util"
++version = "0.3.0"
+description = "small helper to generate version information for git packages"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["rustc", "tool", "git", "version", "hash"]
+categories = ["development-tools"]
+edition = "2018"
+
+[dependencies]
+
+[features]
+deny-warnings = []
--- /dev/null
- rustc_tools_util = "0.2.1"
+# rustc_tools_util
+
+A small tool to help you generate version information
+for packages installed from a git repo
+
+## Usage
+
+Add a `build.rs` file to your repo and list it in `Cargo.toml`
+````toml
+build = "build.rs"
+````
+
+List rustc_tools_util as regular AND build dependency.
+````toml
+[dependencies]
- rustc_tools_util = "0.2.1"
++rustc_tools_util = "0.3.0"
+
+[build-dependencies]
- ````rust
++rustc_tools_util = "0.3.0"
+````
+
+In `build.rs`, generate the data in your `main()`
- println!(
- "cargo:rustc-env=GIT_HASH={}",
- rustc_tools_util::get_commit_hash().unwrap_or_default()
- );
- println!(
- "cargo:rustc-env=COMMIT_DATE={}",
- rustc_tools_util::get_commit_date().unwrap_or_default()
- );
- println!(
- "cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}",
- rustc_tools_util::get_channel().unwrap_or_default()
- );
++
++```rust
+fn main() {
-
- ````
++ rustc_tools_util::setup_version_info!();
+}
- ````rust
- use rustc_tools_util::*;
++```
+
+Use the version information in your main.rs
- ````
+
++```rust
+fn show_version() {
+ let version_info = rustc_tools_util::get_version_info!();
+ println!("{}", version_info);
+}
- `clippy 0.0.212 (a416c5e 2018-12-14)`
++```
++
+This gives the following output in clippy:
++`clippy 0.1.66 (a28f3c8 2022-11-20)`
++
++## Repository
++
++This project is part of the rust-lang/rust-clippy repository. The source code
++can be found under `./rustc_tools_util/`.
+
++The changelog for `rustc_tools_util` is available under:
++[`rustc_tools_util/CHANGELOG.md`](https://github.com/rust-lang/rust-clippy/blob/master/rustc_tools_util/CHANGELOG.md)
+
+## License
+
+Copyright 2014-2022 The Rust Project Developers
+
+Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+<LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+option. All files in the project carrying such notice may not be
+copied, modified, or distributed except according to those terms.
--- /dev/null
- use std::env;
-
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+
- let major = env!("CARGO_PKG_VERSION_MAJOR").parse::<u8>().unwrap();
- let minor = env!("CARGO_PKG_VERSION_MINOR").parse::<u8>().unwrap();
- let patch = env!("CARGO_PKG_VERSION_PATCH").parse::<u16>().unwrap();
- let crate_name = String::from(env!("CARGO_PKG_NAME"));
++/// This macro creates the version string during compilation from the
++/// current environment
+#[macro_export]
+macro_rules! get_version_info {
+ () => {{
- let host_compiler = option_env!("RUSTC_RELEASE_CHANNEL").map(str::to_string);
- let commit_hash = option_env!("GIT_HASH").map(str::to_string);
- let commit_date = option_env!("COMMIT_DATE").map(str::to_string);
++ let major = std::env!("CARGO_PKG_VERSION_MAJOR").parse::<u8>().unwrap();
++ let minor = std::env!("CARGO_PKG_VERSION_MINOR").parse::<u8>().unwrap();
++ let patch = std::env!("CARGO_PKG_VERSION_PATCH").parse::<u16>().unwrap();
++ let crate_name = String::from(std::env!("CARGO_PKG_NAME"));
+
- VersionInfo {
++ let host_compiler = std::option_env!("RUSTC_RELEASE_CHANNEL").map(str::to_string);
++ let commit_hash = std::option_env!("GIT_HASH").map(str::to_string);
++ let commit_date = std::option_env!("COMMIT_DATE").map(str::to_string);
+
- match env::var("CFG_RELEASE_CHANNEL") {
++ $crate::VersionInfo {
+ major,
+ minor,
+ patch,
+ host_compiler,
+ commit_hash,
+ commit_date,
+ crate_name,
+ }
+ }};
+}
+
++/// This macro can be used in `build.rs` to automatically set the needed
++/// environment values, namely `GIT_HASH`, `COMMIT_DATE` and
++/// `RUSTC_RELEASE_CHANNEL`
++#[macro_export]
++macro_rules! setup_version_info {
++ () => {{
++ println!(
++ "cargo:rustc-env=GIT_HASH={}",
++ $crate::get_commit_hash().unwrap_or_default()
++ );
++ println!(
++ "cargo:rustc-env=COMMIT_DATE={}",
++ $crate::get_commit_date().unwrap_or_default()
++ );
++ println!("cargo:rustc-env=RUSTC_RELEASE_CHANNEL={}", $crate::get_channel());
++ }};
++}
++
+// some code taken and adapted from RLS and cargo
+pub struct VersionInfo {
+ pub major: u8,
+ pub minor: u8,
+ pub patch: u16,
+ pub host_compiler: Option<String>,
+ pub commit_hash: Option<String>,
+ pub commit_date: Option<String>,
+ pub crate_name: String,
+}
+
+impl std::fmt::Display for VersionInfo {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ let hash = self.commit_hash.clone().unwrap_or_default();
+ let hash_trimmed = hash.trim();
+
+ let date = self.commit_date.clone().unwrap_or_default();
+ let date_trimmed = date.trim();
+
+ if (hash_trimmed.len() + date_trimmed.len()) > 0 {
+ write!(
+ f,
+ "{} {}.{}.{} ({hash_trimmed} {date_trimmed})",
+ self.crate_name, self.major, self.minor, self.patch,
+ )?;
+ } else {
+ write!(f, "{} {}.{}.{}", self.crate_name, self.major, self.minor, self.patch)?;
+ }
+
+ Ok(())
+ }
+}
+
+impl std::fmt::Debug for VersionInfo {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ write!(
+ f,
+ "VersionInfo {{ crate_name: \"{}\", major: {}, minor: {}, patch: {}",
+ self.crate_name, self.major, self.minor, self.patch,
+ )?;
+ if self.commit_hash.is_some() {
+ write!(
+ f,
+ ", commit_hash: \"{}\", commit_date: \"{}\" }}",
+ self.commit_hash.clone().unwrap_or_default().trim(),
+ self.commit_date.clone().unwrap_or_default().trim()
+ )?;
+ } else {
+ write!(f, " }}")?;
+ }
+
+ Ok(())
+ }
+}
+
+#[must_use]
+pub fn get_commit_hash() -> Option<String> {
+ std::process::Command::new("git")
+ .args(["rev-parse", "--short", "HEAD"])
+ .output()
+ .ok()
+ .and_then(|r| String::from_utf8(r.stdout).ok())
+}
+
+#[must_use]
+pub fn get_commit_date() -> Option<String> {
+ std::process::Command::new("git")
+ .args(["log", "-1", "--date=short", "--pretty=format:%cd"])
+ .output()
+ .ok()
+ .and_then(|r| String::from_utf8(r.stdout).ok())
+}
+
+#[must_use]
+pub fn get_channel() -> String {
- assert_eq!(vi.minor, 2);
- assert_eq!(vi.patch, 1);
++ match std::env::var("CFG_RELEASE_CHANNEL") {
+ Ok(channel) => channel,
+ Err(_) => {
+ // if that failed, try to ask rustc -V, do some parsing and find out
+ match std::process::Command::new("rustc")
+ .arg("-V")
+ .output()
+ .ok()
+ .and_then(|r| String::from_utf8(r.stdout).ok())
+ {
+ Some(rustc_output) => {
+ if rustc_output.contains("beta") {
+ String::from("beta")
+ } else if rustc_output.contains("stable") {
+ String::from("stable")
+ } else {
+ // default to nightly if we fail to parse
+ String::from("nightly")
+ }
+ },
+ // default to nightly
+ None => String::from("nightly"),
+ }
+ },
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use super::*;
+
+ #[test]
+ fn test_struct_local() {
+ let vi = get_version_info!();
+ assert_eq!(vi.major, 0);
- assert_eq!(vi.to_string(), "rustc_tools_util 0.2.1");
++ assert_eq!(vi.minor, 3);
++ assert_eq!(vi.patch, 0);
+ assert_eq!(vi.crate_name, "rustc_tools_util");
+ // hard to make positive tests for these since they will always change
+ assert!(vi.commit_hash.is_none());
+ assert!(vi.commit_date.is_none());
+ }
+
+ #[test]
+ fn test_display_local() {
+ let vi = get_version_info!();
- "VersionInfo { crate_name: \"rustc_tools_util\", major: 0, minor: 2, patch: 1 }"
++ assert_eq!(vi.to_string(), "rustc_tools_util 0.3.0");
+ }
+
+ #[test]
+ fn test_debug_local() {
+ let vi = get_version_info!();
+ let s = format!("{vi:?}");
+ assert_eq!(
+ s,
++ "VersionInfo { crate_name: \"rustc_tools_util\", major: 0, minor: 3, patch: 0 }"
+ );
+ }
+}
--- /dev/null
- use rustc_tools_util::VersionInfo;
+#![feature(rustc_private)]
+#![feature(let_chains)]
+#![feature(once_cell)]
+#![feature(lint_reasons)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// 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_driver;
+extern crate rustc_errors;
+extern crate rustc_interface;
+extern crate rustc_session;
+extern crate rustc_span;
+
+use rustc_interface::interface;
+use rustc_session::parse::ParseSess;
+use rustc_span::symbol::Symbol;
+
+use std::borrow::Cow;
+use std::env;
+use std::ops::Deref;
+use std::panic;
+use std::path::Path;
+use std::process::exit;
+use std::sync::LazyLock;
+
+/// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
+/// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
+fn arg_value<'a, T: Deref<Target = str>>(
+ args: &'a [T],
+ find_arg: &str,
+ pred: impl Fn(&str) -> bool,
+) -> Option<&'a str> {
+ let mut args = args.iter().map(Deref::deref);
+ while let Some(arg) = args.next() {
+ let mut arg = arg.splitn(2, '=');
+ if arg.next() != Some(find_arg) {
+ continue;
+ }
+
+ match arg.next().or_else(|| args.next()) {
+ Some(v) if pred(v) => return Some(v),
+ _ => {},
+ }
+ }
+ None
+}
+
+#[test]
+fn test_arg_value() {
+ let args = &["--bar=bar", "--foobar", "123", "--foo"];
+
+ assert_eq!(arg_value(&[] as &[&str], "--foobar", |_| true), None);
+ assert_eq!(arg_value(args, "--bar", |_| false), None);
+ assert_eq!(arg_value(args, "--bar", |_| true), Some("bar"));
+ assert_eq!(arg_value(args, "--bar", |p| p == "bar"), Some("bar"));
+ assert_eq!(arg_value(args, "--bar", |p| p == "foo"), None);
+ assert_eq!(arg_value(args, "--foobar", |p| p == "foo"), None);
+ assert_eq!(arg_value(args, "--foobar", |p| p == "123"), Some("123"));
+ assert_eq!(arg_value(args, "--foobar", |p| p.contains("12")), Some("123"));
+ assert_eq!(arg_value(args, "--foo", |_| true), None);
+}
+
+fn track_clippy_args(parse_sess: &mut ParseSess, args_env_var: &Option<String>) {
+ parse_sess.env_depinfo.get_mut().insert((
+ Symbol::intern("CLIPPY_ARGS"),
+ args_env_var.as_deref().map(Symbol::intern),
+ ));
+}
+
+/// Track files that may be accessed at runtime in `file_depinfo` so that cargo will re-run clippy
+/// when any of them are modified
+fn track_files(parse_sess: &mut ParseSess, conf_path_string: Option<String>) {
+ let file_depinfo = parse_sess.file_depinfo.get_mut();
+
+ // Used by `clippy::cargo` lints and to determine the MSRV. `cargo clippy` executes `clippy-driver`
+ // with the current directory set to `CARGO_MANIFEST_DIR` so a relative path is fine
+ if Path::new("Cargo.toml").exists() {
+ file_depinfo.insert(Symbol::intern("Cargo.toml"));
+ }
+
+ // `clippy.toml`
+ if let Some(path) = conf_path_string {
+ file_depinfo.insert(Symbol::intern(&path));
+ }
+
+ // During development track the `clippy-driver` executable so that cargo will re-run clippy whenever
+ // it is rebuilt
+ #[expect(
+ clippy::collapsible_if,
+ reason = "Due to a bug in let_chains this if statement can't be collapsed"
+ )]
+ if cfg!(debug_assertions) {
+ if let Ok(current_exe) = env::current_exe()
+ && let Some(current_exe) = current_exe.to_str()
+ {
+ file_depinfo.insert(Symbol::intern(current_exe));
+ }
+ }
+}
+
+struct DefaultCallbacks;
+impl rustc_driver::Callbacks for DefaultCallbacks {}
+
+/// This is different from `DefaultCallbacks` that it will inform Cargo to track the value of
+/// `CLIPPY_ARGS` environment variable.
+struct RustcCallbacks {
+ clippy_args_var: Option<String>,
+}
+
+impl rustc_driver::Callbacks for RustcCallbacks {
+ fn config(&mut self, config: &mut interface::Config) {
+ let clippy_args_var = self.clippy_args_var.take();
+ config.parse_sess_created = Some(Box::new(move |parse_sess| {
+ track_clippy_args(parse_sess, &clippy_args_var);
+ }));
+ }
+}
+
+struct ClippyCallbacks {
+ clippy_args_var: Option<String>,
+}
+
+impl rustc_driver::Callbacks for ClippyCallbacks {
+ // JUSTIFICATION: necessary in clippy driver to set `mir_opt_level`
+ #[allow(rustc::bad_opt_access)]
+ fn config(&mut self, config: &mut interface::Config) {
+ let conf_path = clippy_lints::lookup_conf_file();
+ let conf_path_string = if let Ok(Some(path)) = &conf_path {
+ path.to_str().map(String::from)
+ } else {
+ None
+ };
+
+ let previous = config.register_lints.take();
+ let clippy_args_var = self.clippy_args_var.take();
+ config.parse_sess_created = Some(Box::new(move |parse_sess| {
+ track_clippy_args(parse_sess, &clippy_args_var);
+ track_files(parse_sess, conf_path_string);
+ }));
+ config.register_lints = Some(Box::new(move |sess, lint_store| {
+ // technically we're ~guaranteed that this is none but might as well call anything that
+ // is there already. Certainly it can't hurt.
+ if let Some(previous) = &previous {
+ (previous)(sess, lint_store);
+ }
+
+ let conf = clippy_lints::read_conf(sess, &conf_path);
+ clippy_lints::register_plugins(lint_store, sess, &conf);
+ clippy_lints::register_pre_expansion_lints(lint_store, sess, &conf);
+ clippy_lints::register_renamed(lint_store);
+ }));
+
+ // FIXME: #4825; This is required, because Clippy lints that are based on MIR have to be
+ // run on the unoptimized MIR. On the other hand this results in some false negatives. If
+ // MIR passes can be enabled / disabled separately, we should figure out, what passes to
+ // use for Clippy.
+ config.opts.unstable_opts.mir_opt_level = Some(0);
+ }
+}
+
+fn display_help() {
+ println!(
+ "\
+Checks a package to catch common mistakes and improve your Rust code.
+
+Usage:
+ cargo clippy [options] [--] [<opts>...]
+
+Common options:
+ -h, --help Print this message
+ --rustc Pass all args to rustc
+ -V, --version Print version info and exit
+
+Other options are the same as `cargo check`.
+
+To allow or deny a lint from the command line you can use `cargo clippy --`
+with:
+
+ -W --warn OPT Set lint warnings
+ -A --allow OPT Set lint allowed
+ -D --deny OPT Set lint denied
+ -F --forbid OPT Set lint forbidden
+
+You can use tool lints to allow or deny lints from your code, eg.:
+
+ #[allow(clippy::needless_lifetimes)]
+"
+ );
+}
+
+const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";
+
+type PanicCallback = dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static;
+static ICE_HOOK: LazyLock<Box<PanicCallback>> = LazyLock::new(|| {
+ let hook = panic::take_hook();
+ panic::set_hook(Box::new(|info| report_clippy_ice(info, BUG_REPORT_URL)));
+ hook
+});
+
+fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
+ // Invoke our ICE handler, which prints the actual panic message and optionally a backtrace
+ (*ICE_HOOK)(info);
+
+ // Separate the output with an empty line
+ eprintln!();
+
+ let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+ let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
+ rustc_errors::ColorConfig::Auto,
+ None,
+ None,
+ fallback_bundle,
+ false,
+ false,
+ None,
+ false,
+ false,
+ ));
+ let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
+
+ // a .span_bug or .bug call has already printed what
+ // it wants to print.
+ if !info.payload().is::<rustc_errors::ExplicitBug>() {
+ let mut d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
+ handler.emit_diagnostic(&mut d);
+ }
+
+ let version_info = rustc_tools_util::get_version_info!();
+
+ let xs: Vec<Cow<'static, str>> = vec![
+ "the compiler unexpectedly panicked. this is a bug.".into(),
+ format!("we would appreciate a bug report: {bug_report_url}").into(),
+ format!("Clippy version: {version_info}").into(),
+ ];
+
+ for note in &xs {
+ handler.note_without_error(note.as_ref());
+ }
+
+ // If backtraces are enabled, also print the query stack
+ let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");
+
+ let num_frames = if backtrace { None } else { Some(2) };
+
+ interface::try_print_query_stack(&handler, num_frames);
+}
+
+#[allow(clippy::too_many_lines)]
+pub fn main() {
+ rustc_driver::init_rustc_env_logger();
+ LazyLock::force(&ICE_HOOK);
+ exit(rustc_driver::catch_with_exit_code(move || {
+ let mut orig_args: Vec<String> = env::args().collect();
+
+ let sys_root_env = std::env::var("SYSROOT").ok();
+ let pass_sysroot_env_if_given = |args: &mut Vec<String>, sys_root_env| {
+ if let Some(sys_root) = sys_root_env {
+ args.extend(vec!["--sysroot".into(), sys_root]);
+ };
+ };
+
+ // make "clippy-driver --rustc" work like a subcommand that passes further args to "rustc"
+ // for example `clippy-driver --rustc --version` will print the rustc version that clippy-driver
+ // uses
+ if let Some(pos) = orig_args.iter().position(|arg| arg == "--rustc") {
+ orig_args.remove(pos);
+ orig_args[0] = "rustc".to_string();
+
+ let mut args: Vec<String> = orig_args.clone();
+ pass_sysroot_env_if_given(&mut args, sys_root_env);
+
+ return rustc_driver::RunCompiler::new(&args, &mut DefaultCallbacks).run();
+ }
+
+ if orig_args.iter().any(|a| a == "--version" || a == "-V") {
+ let version_info = rustc_tools_util::get_version_info!();
+ println!("{version_info}");
+ exit(0);
+ }
+
+ // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
+ // We're invoking the compiler programmatically, so we ignore this/
+ let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref());
+
+ if wrapper_mode {
+ // we still want to be able to invoke it normally though
+ orig_args.remove(1);
+ }
+
+ if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) {
+ display_help();
+ exit(0);
+ }
+
+ let mut args: Vec<String> = orig_args.clone();
+ pass_sysroot_env_if_given(&mut args, sys_root_env);
+
+ let mut no_deps = false;
+ let clippy_args_var = env::var("CLIPPY_ARGS").ok();
+ let clippy_args = clippy_args_var
+ .as_deref()
+ .unwrap_or_default()
+ .split("__CLIPPY_HACKERY__")
+ .filter_map(|s| match s {
+ "" => None,
+ "--no-deps" => {
+ no_deps = true;
+ None
+ },
+ _ => Some(s.to_string()),
+ })
+ .chain(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()])
+ .collect::<Vec<String>>();
+
+ // We enable Clippy if one of the following conditions is met
+ // - IF Clippy is run on its test suite OR
+ // - IF Clippy is run on the main crate, not on deps (`!cap_lints_allow`) THEN
+ // - IF `--no-deps` is not set (`!no_deps`) OR
+ // - IF `--no-deps` is set and Clippy is run on the specified primary package
+ let cap_lints_allow = arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_some()
+ && arg_value(&orig_args, "--force-warn", |val| val.contains("clippy::")).is_none();
+ let in_primary_package = env::var("CARGO_PRIMARY_PACKAGE").is_ok();
+
+ let clippy_enabled = !cap_lints_allow && (!no_deps || in_primary_package);
+ if clippy_enabled {
+ args.extend(clippy_args);
+ rustc_driver::RunCompiler::new(&args, &mut ClippyCallbacks { clippy_args_var }).run()
+ } else {
+ rustc_driver::RunCompiler::new(&args, &mut RustcCallbacks { clippy_args_var }).run()
+ }
+ }))
+}
--- /dev/null
- use rustc_tools_util::VersionInfo;
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use std::env;
+use std::path::PathBuf;
+use std::process::{self, Command};
+
+const CARGO_CLIPPY_HELP: &str = r#"Checks a package to catch common mistakes and improve your Rust code.
+
+Usage:
+ cargo clippy [options] [--] [<opts>...]
+
+Common options:
+ --no-deps Run Clippy only on the given crate, without linting the dependencies
+ --fix Automatically apply lint suggestions. This flag implies `--no-deps`
+ -h, --help Print this message
+ -V, --version Print version info and exit
+ --explain LINT Print the documentation for a given lint
+
+Other options are the same as `cargo check`.
+
+To allow or deny a lint from the command line you can use `cargo clippy --`
+with:
+
+ -W --warn OPT Set lint warnings
+ -A --allow OPT Set lint allowed
+ -D --deny OPT Set lint denied
+ -F --forbid OPT Set lint forbidden
+
+You can use tool lints to allow or deny lints from your code, eg.:
+
+ #[allow(clippy::needless_lifetimes)]
+"#;
+
+fn show_help() {
+ println!("{CARGO_CLIPPY_HELP}");
+}
+
+fn show_version() {
+ let version_info = rustc_tools_util::get_version_info!();
+ println!("{version_info}");
+}
+
+pub fn main() {
+ // Check for version and help flags even when invoked as 'cargo-clippy'
+ if env::args().any(|a| a == "--help" || a == "-h") {
+ show_help();
+ return;
+ }
+
+ if env::args().any(|a| a == "--version" || a == "-V") {
+ show_version();
+ return;
+ }
+
+ if let Some(pos) = env::args().position(|a| a == "--explain") {
+ if let Some(mut lint) = env::args().nth(pos + 1) {
+ lint.make_ascii_lowercase();
+ clippy_lints::explain(&lint.strip_prefix("clippy::").unwrap_or(&lint).replace('-', "_"));
+ } else {
+ show_help();
+ }
+ return;
+ }
+
+ if let Err(code) = process(env::args().skip(2)) {
+ process::exit(code);
+ }
+}
+
+struct ClippyCmd {
+ cargo_subcommand: &'static str,
+ args: Vec<String>,
+ clippy_args: Vec<String>,
+}
+
+impl ClippyCmd {
+ fn new<I>(mut old_args: I) -> Self
+ where
+ I: Iterator<Item = String>,
+ {
+ let mut cargo_subcommand = "check";
+ let mut args = vec![];
+ let mut clippy_args: Vec<String> = vec![];
+
+ for arg in old_args.by_ref() {
+ match arg.as_str() {
+ "--fix" => {
+ cargo_subcommand = "fix";
+ continue;
+ },
+ "--no-deps" => {
+ clippy_args.push("--no-deps".into());
+ continue;
+ },
+ "--" => break,
+ _ => {},
+ }
+
+ args.push(arg);
+ }
+
+ clippy_args.append(&mut (old_args.collect()));
+ if cargo_subcommand == "fix" && !clippy_args.iter().any(|arg| arg == "--no-deps") {
+ clippy_args.push("--no-deps".into());
+ }
+
+ Self {
+ cargo_subcommand,
+ args,
+ clippy_args,
+ }
+ }
+
+ fn path() -> PathBuf {
+ let mut path = env::current_exe()
+ .expect("current executable path invalid")
+ .with_file_name("clippy-driver");
+
+ if cfg!(windows) {
+ path.set_extension("exe");
+ }
+
+ path
+ }
+
+ fn into_std_cmd(self) -> Command {
+ let mut cmd = Command::new("cargo");
+ let clippy_args: String = self
+ .clippy_args
+ .iter()
+ .map(|arg| format!("{arg}__CLIPPY_HACKERY__"))
+ .collect();
+
+ // Currently, `CLIPPY_TERMINAL_WIDTH` is used only to format "unknown field" error messages.
+ let terminal_width = termize::dimensions().map_or(0, |(w, _)| w);
+
+ cmd.env("RUSTC_WORKSPACE_WRAPPER", Self::path())
+ .env("CLIPPY_ARGS", clippy_args)
+ .env("CLIPPY_TERMINAL_WIDTH", terminal_width.to_string())
+ .arg(self.cargo_subcommand)
+ .args(&self.args);
+
+ cmd
+ }
+}
+
+fn process<I>(old_args: I) -> Result<(), i32>
+where
+ I: Iterator<Item = String>,
+{
+ let cmd = ClippyCmd::new(old_args);
+
+ let mut cmd = cmd.into_std_cmd();
+
+ let exit_status = cmd
+ .spawn()
+ .expect("could not run cargo")
+ .wait()
+ .expect("failed to wait for cargo?");
+
+ if exit_status.success() {
+ Ok(())
+ } else {
+ Err(exit_status.code().unwrap_or(-1))
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::ClippyCmd;
+
+ #[test]
+ fn fix() {
+ let args = "cargo clippy --fix".split_whitespace().map(ToString::to_string);
+ let cmd = ClippyCmd::new(args);
+ assert_eq!("fix", cmd.cargo_subcommand);
+ assert!(!cmd.args.iter().any(|arg| arg.ends_with("unstable-options")));
+ }
+
+ #[test]
+ fn fix_implies_no_deps() {
+ let args = "cargo clippy --fix".split_whitespace().map(ToString::to_string);
+ let cmd = ClippyCmd::new(args);
+ assert!(cmd.clippy_args.iter().any(|arg| arg == "--no-deps"));
+ }
+
+ #[test]
+ fn no_deps_not_duplicated_with_fix() {
+ let args = "cargo clippy --fix -- --no-deps"
+ .split_whitespace()
+ .map(ToString::to_string);
+ let cmd = ClippyCmd::new(args);
+ assert_eq!(cmd.clippy_args.iter().filter(|arg| *arg == "--no-deps").count(), 1);
+ }
+
+ #[test]
+ fn check() {
+ let args = "cargo clippy".split_whitespace().map(ToString::to_string);
+ let cmd = ClippyCmd::new(args);
+ assert_eq!("check", cmd.cargo_subcommand);
+ }
+}
--- /dev/null
- 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`
+ = note: `-D clippy::unnecessary-def-path` implied by `-D warnings`
+
+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`
+
++error: hardcoded path to a diagnostic item
++ --> $DIR/unnecessary_def_path_hardcoded_path.rs:12:43
++ |
++LL | const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: convert all references to use `sym::deref_method`
++
+error: aborting due to 3 previous errors
+
--- /dev/null
- #[derive(Clone, Copy)]
- struct Point {
- x: i32,
- y: i32,
+#![warn(clippy::arithmetic_side_effects)]
+
+use core::ops::{Add, Neg};
+
- impl Add for Point {
- type Output = Self;
++macro_rules! create {
++ ($name:ident) => {
++ #[allow(clippy::arithmetic_side_effects)]
++ #[derive(Clone, Copy)]
++ struct $name;
++
++ impl Add<$name> for $name {
++ type Output = $name;
++ fn add(self, other: $name) -> Self::Output {
++ todo!()
++ }
++ }
++
++ impl Add<i32> for $name {
++ type Output = $name;
++ fn add(self, other: i32) -> Self::Output {
++ todo!()
++ }
++ }
++
++ impl Add<$name> for i32 {
++ type Output = $name;
++ fn add(self, other: $name) -> Self::Output {
++ todo!()
++ }
++ }
++
++ impl Add<i64> for $name {
++ type Output = $name;
++ fn add(self, other: i64) -> Self::Output {
++ todo!()
++ }
++ }
++
++ impl Add<$name> for i64 {
++ type Output = $name;
++ fn add(self, other: $name) -> Self::Output {
++ todo!()
++ }
++ }
++
++ impl Neg for $name {
++ type Output = $name;
++ fn neg(self) -> Self::Output {
++ todo!()
++ }
++ }
++ };
+}
+
- fn add(self, other: Self) -> Self {
- todo!()
- }
++create!(Foo);
++create!(Bar);
++create!(Baz);
++create!(OutOfNames);
+
- impl Neg for Point {
- type Output = Self;
++fn lhs_and_rhs_are_equal() {
++ // is explicitly on the list
++ let _ = OutOfNames + OutOfNames;
++ // is explicitly on the list
++ let _ = Foo + Foo;
++ // is implicitly on the list
++ let _ = Bar + Bar;
++ // not on the list
++ let _ = Baz + Baz;
+}
+
- fn neg(self) -> Self::Output {
- todo!()
- }
++fn lhs_is_different() {
++ // is explicitly on the list
++ let _ = 1i32 + OutOfNames;
++ // is explicitly on the list
++ let _ = 1i32 + Foo;
++ // is implicitly on the list
++ let _ = 1i32 + Bar;
++ // not on the list
++ let _ = 1i32 + Baz;
+
- fn main() {
- let _ = Point { x: 1, y: 0 } + Point { x: 2, y: 3 };
++ // not on the list
++ let _ = 1i64 + Foo;
++ // is implicitly on the list
++ let _ = 1i64 + Bar;
++ // not on the list
++ let _ = 1i64 + Baz;
+}
+
- let point: Point = Point { x: 1, y: 0 };
- let _ = point + point;
- let _ = -point;
++fn rhs_is_different() {
++ // is explicitly on the list
++ let _ = OutOfNames + 1i32;
++ // is explicitly on the list
++ let _ = Foo + 1i32;
++ // is implicitly on the list
++ let _ = Bar + 1i32;
++ // not on the list
++ let _ = Baz + 1i32;
++
++ // not on the list
++ let _ = Foo + 1i64;
++ // is implicitly on the list
++ let _ = Bar + 1i64;
++ // not on the list
++ let _ = Baz + 1i64;
++}
+
++fn unary() {
++ // is explicitly on the list
++ let _ = -OutOfNames;
++ // is specifically on the list
++ let _ = -Foo;
++ // not on the list
++ let _ = -Bar;
++ // not on the list
++ let _ = -Baz;
+}
++
++fn main() {}
--- /dev/null
--- /dev/null
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:68:13
++ |
++LL | let _ = Baz + Baz;
++ | ^^^^^^^^^
++ |
++ = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:79:13
++ |
++LL | let _ = 1i32 + Baz;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:82:13
++ |
++LL | let _ = 1i64 + Foo;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:86:13
++ |
++LL | let _ = 1i64 + Baz;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:97:13
++ |
++LL | let _ = Baz + 1i32;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:100:13
++ |
++LL | let _ = Foo + 1i64;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:104:13
++ |
++LL | let _ = Baz + 1i64;
++ | ^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:113:13
++ |
++LL | let _ = -Bar;
++ | ^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects_allowed.rs:115:13
++ |
++LL | let _ = -Baz;
++ | ^^^^
++
++error: aborting due to 9 previous errors
++
--- /dev/null
- arithmetic-side-effects-allowed = ["Point"]
++arithmetic-side-effects-allowed = [
++ "OutOfNames"
++]
++arithmetic-side-effects-allowed-binary = [
++ ["Foo", "Foo"],
++ ["Foo", "i32"],
++ ["i32", "Foo"],
++ ["Bar", "*"],
++ ["*", "Bar"],
++]
++arithmetic-side-effects-allowed-unary = ["Foo"]
--- /dev/null
--- /dev/null
++suppress-restriction-lint-in-const = true
--- /dev/null
--- /dev/null
++#![feature(inline_const)]
++#![warn(clippy::indexing_slicing)]
++// We also check the out_of_bounds_indexing lint here, because it lints similar things and
++// we want to avoid false positives.
++#![warn(clippy::out_of_bounds_indexing)]
++#![allow(unconditional_panic, clippy::no_effect, clippy::unnecessary_operation)]
++
++const ARR: [i32; 2] = [1, 2];
++const REF: &i32 = &ARR[idx()]; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
++const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
++
++const fn idx() -> usize {
++ 1
++}
++const fn idx4() -> usize {
++ 4
++}
++
++fn main() {
++ let x = [1, 2, 3, 4];
++ let index: usize = 1;
++ x[index];
++ x[4]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
++ x[1 << 3]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
++
++ x[0]; // Ok, should not produce stderr.
++ x[3]; // Ok, should not produce stderr.
++ x[const { idx() }]; // Ok, should not produce stderr.
++ x[const { idx4() }]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
++ const { &ARR[idx()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
++ const { &ARR[idx4()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
++
++ let y = &x;
++ y[0]; // Ok, referencing shouldn't affect this lint. See the issue 6021
++ y[4]; // Ok, rustc will handle references too.
++
++ let v = vec![0; 5];
++ v[0];
++ v[10];
++ v[1 << 3];
++
++ const N: usize = 15; // Out of bounds
++ const M: usize = 3; // In bounds
++ x[N]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
++ x[M]; // Ok, should not produce stderr.
++ v[N];
++ v[M];
++}
++
++/// An opaque integer representation
++pub struct Integer<'a> {
++ /// The underlying data
++ value: &'a [u8],
++}
++impl<'a> Integer<'a> {
++ // Check whether `self` holds a negative number or not
++ pub const fn is_negative(&self) -> bool {
++ self.value[0] & 0b1000_0000 != 0
++ }
++}
--- /dev/null
--- /dev/null
++error[E0080]: evaluation of `main::{constant#3}` failed
++ --> $DIR/test.rs:31:14
++ |
++LL | const { &ARR[idx4()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
++ | ^^^^^^^^^^^ index out of bounds: the length is 2 but the index is 4
++
++note: erroneous constant used
++ --> $DIR/test.rs:31:5
++ |
++LL | const { &ARR[idx4()] }; // Ok, should not produce stderr, since `suppress-restriction-lint-in-const` is set true.
++ | ^^^^^^^^^^^^^^^^^^^^^^
++
++error: indexing may panic
++ --> $DIR/test.rs:22:5
++ |
++LL | x[index];
++ | ^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++ = note: `-D clippy::indexing-slicing` implied by `-D warnings`
++
++error: indexing may panic
++ --> $DIR/test.rs:38:5
++ |
++LL | v[0];
++ | ^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++
++error: indexing may panic
++ --> $DIR/test.rs:39:5
++ |
++LL | v[10];
++ | ^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++
++error: indexing may panic
++ --> $DIR/test.rs:40:5
++ |
++LL | v[1 << 3];
++ | ^^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++
++error: indexing may panic
++ --> $DIR/test.rs:46:5
++ |
++LL | v[N];
++ | ^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++
++error: indexing may panic
++ --> $DIR/test.rs:47:5
++ |
++LL | v[M];
++ | ^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++
++error[E0080]: evaluation of constant value failed
++ --> $DIR/test.rs:10:24
++ |
++LL | const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
++ | ^^^^^^^^^^^ index out of bounds: the length is 2 but the index is 4
++
++error: aborting due to 8 previous errors
++
++For more information about this error, try `rustc --explain E0080`.
--- /dev/null
+error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of
+ allow-dbg-in-tests
+ allow-expect-in-tests
+ allow-mixed-uninlined-format-args
+ allow-print-in-tests
+ allow-unwrap-in-tests
+ allowed-scripts
+ arithmetic-side-effects-allowed
++ arithmetic-side-effects-allowed-binary
++ arithmetic-side-effects-allowed-unary
+ array-size-threshold
+ avoid-breaking-exported-api
+ await-holding-invalid-types
+ blacklisted-names
+ cargo-ignore-publish
+ cognitive-complexity-threshold
+ cyclomatic-complexity-threshold
+ disallowed-macros
+ disallowed-methods
+ disallowed-names
+ disallowed-types
+ doc-valid-idents
+ enable-raw-pointer-heuristic-for-send
+ enforced-import-renames
+ enum-variant-name-threshold
+ enum-variant-size-threshold
+ ignore-interior-mutability
+ large-error-threshold
+ literal-representation-threshold
+ matches-for-let-else
+ max-fn-params-bools
+ max-include-file-size
+ max-struct-bools
+ max-suggested-slice-pattern-length
+ max-trait-bounds
+ msrv
+ pass-by-value-size-limit
+ single-char-binding-names-threshold
+ standard-macro-braces
++ suppress-restriction-lint-in-const
+ third-party
+ too-large-for-stack
+ too-many-arguments-threshold
+ too-many-lines-threshold
+ trivial-copy-size-limit
+ type-complexity-threshold
+ unreadable-literal-lint-fractions
+ upper-case-acronyms-aggressive
+ vec-box-size-threshold
+ verbose-bit-mask-threshold
+ warn-on-all-wildcard-imports
+ at line 5 column 1
+
+error: aborting due to previous error
+
--- /dev/null
--- /dev/null
++// run-rustfix
++// edition:2018
++// aux-build:macro_rules.rs
++
++#![feature(exclusive_range_pattern)]
++#![feature(stmt_expr_attributes)]
++#![warn(clippy::almost_complete_range)]
++#![allow(ellipsis_inclusive_range_patterns)]
++#![allow(clippy::needless_parens_on_range_literals)]
++#![allow(clippy::double_parens)]
++
++#[macro_use]
++extern crate macro_rules;
++
++macro_rules! a {
++ () => {
++ 'a'
++ };
++}
++macro_rules! A {
++ () => {
++ 'A'
++ };
++}
++macro_rules! zero {
++ () => {
++ '0'
++ };
++}
++
++macro_rules! b {
++ () => {
++ let _ = 'a'..='z';
++ let _ = 'A'..='Z';
++ let _ = '0'..='9';
++ };
++}
++
++fn main() {
++ #[rustfmt::skip]
++ {
++ let _ = ('a') ..='z';
++ let _ = 'A' ..= ('Z');
++ let _ = ((('0'))) ..= ('9');
++ }
++
++ let _ = 'b'..'z';
++ let _ = 'B'..'Z';
++ let _ = '1'..'9';
++
++ let _ = (b'a')..=(b'z');
++ let _ = b'A'..=b'Z';
++ let _ = b'0'..=b'9';
++
++ let _ = b'b'..b'z';
++ let _ = b'B'..b'Z';
++ let _ = b'1'..b'9';
++
++ let _ = a!()..='z';
++ let _ = A!()..='Z';
++ let _ = zero!()..='9';
++
++ let _ = match 0u8 {
++ b'a'..=b'z' if true => 1,
++ b'A'..=b'Z' if true => 2,
++ b'0'..=b'9' if true => 3,
++ b'b'..b'z' => 4,
++ b'B'..b'Z' => 5,
++ b'1'..b'9' => 6,
++ _ => 7,
++ };
++
++ let _ = match 'x' {
++ 'a'..='z' if true => 1,
++ 'A'..='Z' if true => 2,
++ '0'..='9' if true => 3,
++ 'b'..'z' => 4,
++ 'B'..'Z' => 5,
++ '1'..'9' => 6,
++ _ => 7,
++ };
++
++ almost_complete_range!();
++ b!();
++}
++
++#[clippy::msrv = "1.25"]
++fn _under_msrv() {
++ let _ = match 'a' {
++ 'a'...'z' => 1,
++ 'A'...'Z' => 2,
++ '0'...'9' => 3,
++ _ => 4,
++ };
++}
++
++#[clippy::msrv = "1.26"]
++fn _meets_msrv() {
++ let _ = 'a'..='z';
++ let _ = 'A'..='Z';
++ let _ = '0'..='9';
++ let _ = match 'a' {
++ 'a'..='z' => 1,
++ 'A'..='Z' => 1,
++ '0'..='9' => 3,
++ _ => 4,
++ };
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++// edition:2018
++// aux-build:macro_rules.rs
++
++#![feature(exclusive_range_pattern)]
++#![feature(stmt_expr_attributes)]
++#![warn(clippy::almost_complete_range)]
++#![allow(ellipsis_inclusive_range_patterns)]
++#![allow(clippy::needless_parens_on_range_literals)]
++#![allow(clippy::double_parens)]
++
++#[macro_use]
++extern crate macro_rules;
++
++macro_rules! a {
++ () => {
++ 'a'
++ };
++}
++macro_rules! A {
++ () => {
++ 'A'
++ };
++}
++macro_rules! zero {
++ () => {
++ '0'
++ };
++}
++
++macro_rules! b {
++ () => {
++ let _ = 'a'..'z';
++ let _ = 'A'..'Z';
++ let _ = '0'..'9';
++ };
++}
++
++fn main() {
++ #[rustfmt::skip]
++ {
++ let _ = ('a') ..'z';
++ let _ = 'A' .. ('Z');
++ let _ = ((('0'))) .. ('9');
++ }
++
++ let _ = 'b'..'z';
++ let _ = 'B'..'Z';
++ let _ = '1'..'9';
++
++ let _ = (b'a')..(b'z');
++ let _ = b'A'..b'Z';
++ let _ = b'0'..b'9';
++
++ let _ = b'b'..b'z';
++ let _ = b'B'..b'Z';
++ let _ = b'1'..b'9';
++
++ let _ = a!()..'z';
++ let _ = A!()..'Z';
++ let _ = zero!()..'9';
++
++ let _ = match 0u8 {
++ b'a'..b'z' if true => 1,
++ b'A'..b'Z' if true => 2,
++ b'0'..b'9' if true => 3,
++ b'b'..b'z' => 4,
++ b'B'..b'Z' => 5,
++ b'1'..b'9' => 6,
++ _ => 7,
++ };
++
++ let _ = match 'x' {
++ 'a'..'z' if true => 1,
++ 'A'..'Z' if true => 2,
++ '0'..'9' if true => 3,
++ 'b'..'z' => 4,
++ 'B'..'Z' => 5,
++ '1'..'9' => 6,
++ _ => 7,
++ };
++
++ almost_complete_range!();
++ b!();
++}
++
++#[clippy::msrv = "1.25"]
++fn _under_msrv() {
++ let _ = match 'a' {
++ 'a'..'z' => 1,
++ 'A'..'Z' => 2,
++ '0'..'9' => 3,
++ _ => 4,
++ };
++}
++
++#[clippy::msrv = "1.26"]
++fn _meets_msrv() {
++ let _ = 'a'..'z';
++ let _ = 'A'..'Z';
++ let _ = '0'..'9';
++ let _ = match 'a' {
++ 'a'..'z' => 1,
++ 'A'..'Z' => 1,
++ '0'..'9' => 3,
++ _ => 4,
++ };
++}
--- /dev/null
--- /dev/null
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:42:17
++ |
++LL | let _ = ('a') ..'z';
++ | ^^^^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++ |
++ = note: `-D clippy::almost-complete-range` implied by `-D warnings`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:43:17
++ |
++LL | let _ = 'A' .. ('Z');
++ | ^^^^--^^^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:44:17
++ |
++LL | let _ = ((('0'))) .. ('9');
++ | ^^^^^^^^^^--^^^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:51:13
++ |
++LL | let _ = (b'a')..(b'z');
++ | ^^^^^^--^^^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:52:13
++ |
++LL | let _ = b'A'..b'Z';
++ | ^^^^--^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:53:13
++ |
++LL | let _ = b'0'..b'9';
++ | ^^^^--^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:59:13
++ |
++LL | let _ = a!()..'z';
++ | ^^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:60:13
++ |
++LL | let _ = A!()..'Z';
++ | ^^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:61:13
++ |
++LL | let _ = zero!()..'9';
++ | ^^^^^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:64:9
++ |
++LL | b'a'..b'z' if true => 1,
++ | ^^^^--^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:65:9
++ |
++LL | b'A'..b'Z' if true => 2,
++ | ^^^^--^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:66:9
++ |
++LL | b'0'..b'9' if true => 3,
++ | ^^^^--^^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:74:9
++ |
++LL | 'a'..'z' if true => 1,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:75:9
++ |
++LL | 'A'..'Z' if true => 2,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:76:9
++ |
++LL | '0'..'9' if true => 3,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:33:17
++ |
++LL | let _ = 'a'..'z';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++...
++LL | b!();
++ | ---- in this macro invocation
++ |
++ = note: this error originates in the macro `b` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:34:17
++ |
++LL | let _ = 'A'..'Z';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++...
++LL | b!();
++ | ---- in this macro invocation
++ |
++ = note: this error originates in the macro `b` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:35:17
++ |
++LL | let _ = '0'..'9';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++...
++LL | b!();
++ | ---- in this macro invocation
++ |
++ = note: this error originates in the macro `b` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:90:9
++ |
++LL | 'a'..'z' => 1,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `...`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:91:9
++ |
++LL | 'A'..'Z' => 2,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `...`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:92:9
++ |
++LL | '0'..'9' => 3,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `...`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:99:13
++ |
++LL | let _ = 'a'..'z';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:100:13
++ |
++LL | let _ = 'A'..'Z';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:101:13
++ |
++LL | let _ = '0'..'9';
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:103:9
++ |
++LL | 'a'..'z' => 1,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:104:9
++ |
++LL | 'A'..'Z' => 1,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: almost complete ascii range
++ --> $DIR/almost_complete_range.rs:105:9
++ |
++LL | '0'..'9' => 3,
++ | ^^^--^^^
++ | |
++ | help: use an inclusive range: `..=`
++
++error: aborting due to 27 previous errors
++
--- /dev/null
- error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:78:13
- |
- LL | let _ = String::new() + "";
- | ^^^^^^^^^^^^^^^^^^
- |
- = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
-
- error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:86:27
- |
- LL | let inferred_string = string + "";
- | ^^^^^^^^^^^
-
- error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:90:13
- |
- LL | let _ = inferred_string + "";
- | ^^^^^^^^^^^^^^^^^^^^
-
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:165:5
+ |
+LL | _n += 1;
+ | ^^^^^^^
++ |
++ = note: `-D clippy::arithmetic-side-effects` implied by `-D warnings`
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:166:5
+ |
+LL | _n += &1;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:167:5
+ |
+LL | _n -= 1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:168:5
+ |
+LL | _n -= &1;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:169:5
+ |
+LL | _n /= 0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:170:5
+ |
+LL | _n /= &0;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:171:5
+ |
+LL | _n %= 0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:172:5
+ |
+LL | _n %= &0;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:173:5
+ |
+LL | _n *= 2;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:174:5
+ |
+LL | _n *= &2;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:177:10
+ |
+LL | _n = _n + 1;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:178:10
+ |
+LL | _n = _n + &1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:179:10
+ |
+LL | _n = 1 + _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:180:10
+ |
+LL | _n = &1 + _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:181:10
+ |
+LL | _n = _n - 1;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:182:10
+ |
+LL | _n = _n - &1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:183:10
+ |
+LL | _n = 1 - _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:184:10
+ |
+LL | _n = &1 - _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:185:10
+ |
+LL | _n = _n / 0;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:186:10
+ |
+LL | _n = _n / &0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:187:10
+ |
+LL | _n = _n % 0;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:188:10
+ |
+LL | _n = _n % &0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:189:10
+ |
+LL | _n = _n * 2;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:190:10
+ |
+LL | _n = _n * &2;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:191:10
+ |
+LL | _n = 2 * _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:192:10
+ |
+LL | _n = &2 * _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:193:10
+ |
+LL | _n = 23 + &85;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:194:10
+ |
+LL | _n = &23 + 85;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:195:10
+ |
+LL | _n = &23 + &85;
+ | ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:198:13
+ |
+LL | let _ = Custom + 0;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:199:13
+ |
+LL | let _ = Custom + 1;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:200:13
+ |
+LL | let _ = Custom + 2;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:201:13
+ |
+LL | let _ = Custom + 0.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:202:13
+ |
+LL | let _ = Custom + 1.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:203:13
+ |
+LL | let _ = Custom + 2.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:204:13
+ |
+LL | let _ = Custom - 0;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:205:13
+ |
+LL | let _ = Custom - 1;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:206:13
+ |
+LL | let _ = Custom - 2;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:207:13
+ |
+LL | let _ = Custom - 0.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:208:13
+ |
+LL | let _ = Custom - 1.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:209:13
+ |
+LL | let _ = Custom - 2.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:210:13
+ |
+LL | let _ = Custom / 0;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:211:13
+ |
+LL | let _ = Custom / 1;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:212:13
+ |
+LL | let _ = Custom / 2;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:213:13
+ |
+LL | let _ = Custom / 0.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:214:13
+ |
+LL | let _ = Custom / 1.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:215:13
+ |
+LL | let _ = Custom / 2.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:216:13
+ |
+LL | let _ = Custom * 0;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:217:13
+ |
+LL | let _ = Custom * 1;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:218:13
+ |
+LL | let _ = Custom * 2;
+ | ^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:219:13
+ |
+LL | let _ = Custom * 0.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:220:13
+ |
+LL | let _ = Custom * 1.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:221:13
+ |
+LL | let _ = Custom * 2.0;
+ | ^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:224:10
+ |
+LL | _n = -_n;
+ | ^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
+ --> $DIR/arithmetic_side_effects.rs:225:10
+ |
+LL | _n = -&_n;
+ | ^^^^
+
- error: aborting due to 58 previous errors
++error: aborting due to 55 previous errors
+
--- /dev/null
- macro_rules! almost_complete_letter_range {
+#![allow(dead_code)]
+
+//! Used to test that certain lints don't trigger in imported external macros
+
+#[macro_export]
+macro_rules! foofoo {
+ () => {
+ loop {}
+ };
+}
+
+#[macro_export]
+macro_rules! must_use_unit {
+ () => {
+ #[must_use]
+ fn foo() {}
+ };
+}
+
+#[macro_export]
+macro_rules! try_err {
+ () => {
+ pub fn try_err_fn() -> Result<i32, i32> {
+ let err: i32 = 1;
+ // To avoid warnings during rustfix
+ if true { Err(err)? } else { Ok(2) }
+ }
+ };
+}
+
+#[macro_export]
+macro_rules! string_add {
+ () => {
+ let y = "".to_owned();
+ let z = y + "...";
+ };
+}
+
+#[macro_export]
+macro_rules! take_external {
+ ($s:expr) => {
+ std::mem::replace($s, Default::default())
+ };
+}
+
+#[macro_export]
+macro_rules! option_env_unwrap_external {
+ ($env: expr) => {
+ option_env!($env).unwrap()
+ };
+ ($env: expr, $message: expr) => {
+ option_env!($env).expect($message)
+ };
+}
+
+#[macro_export]
+macro_rules! ref_arg_binding {
+ () => {
+ let ref _y = 42;
+ };
+}
+
+#[macro_export]
+macro_rules! ref_arg_function {
+ () => {
+ fn fun_example(ref _x: usize) {}
+ };
+}
+
+#[macro_export]
+macro_rules! as_conv_with_arg {
+ (0u32 as u64) => {
+ ()
+ };
+}
+
+#[macro_export]
+macro_rules! as_conv {
+ () => {
+ 0u32 as u64
+ };
+}
+
+#[macro_export]
+macro_rules! large_enum_variant {
+ () => {
+ enum LargeEnumInMacro {
+ A(i32),
+ B([i32; 8000]),
+ }
+ };
+}
+
+#[macro_export]
+macro_rules! field_reassign_with_default {
+ () => {
+ #[derive(Default)]
+ struct A {
+ pub i: i32,
+ pub j: i64,
+ }
+ fn lint() {
+ let mut a: A = Default::default();
+ a.i = 42;
+ a;
+ }
+ };
+}
+
+#[macro_export]
+macro_rules! default_numeric_fallback {
+ () => {
+ let x = 22;
+ };
+}
+
+#[macro_export]
+macro_rules! mut_mut {
+ () => {
+ let mut_mut_ty: &mut &mut u32 = &mut &mut 1u32;
+ };
+}
+
+#[macro_export]
+macro_rules! ptr_as_ptr_cast {
+ ($ptr: ident) => {
+ $ptr as *const i32
+ };
+}
+
+#[macro_export]
+macro_rules! manual_rem_euclid {
+ () => {
+ let value: i32 = 5;
+ let _: i32 = ((value % 4) + 4) % 4;
+ };
+}
+
+#[macro_export]
+macro_rules! equatable_if_let {
+ ($a:ident) => {{ if let 2 = $a {} }};
+}
+
+#[macro_export]
++macro_rules! almost_complete_range {
+ () => {
+ let _ = 'a'..'z';
++ let _ = 'A'..'Z';
++ let _ = '0'..'9';
+ };
+}
--- /dev/null
+// run-rustfix
+
+#![allow(clippy::no_effect, clippy::unnecessary_operation, dead_code)]
+#![warn(clippy::cast_lossless)]
+
+fn main() {
+ // Test clippy::cast_lossless with casts to integer types
+ let _ = i16::from(1i8);
+ let _ = i32::from(1i8);
+ let _ = i64::from(1i8);
+ let _ = i16::from(1u8);
+ let _ = i32::from(1u8);
+ let _ = i64::from(1u8);
+ let _ = u16::from(1u8);
+ let _ = u32::from(1u8);
+ let _ = u64::from(1u8);
+ let _ = i32::from(1i16);
+ let _ = i64::from(1i16);
+ let _ = i32::from(1u16);
+ let _ = i64::from(1u16);
+ let _ = u32::from(1u16);
+ let _ = u64::from(1u16);
+ let _ = i64::from(1i32);
+ let _ = i64::from(1u32);
+ let _ = u64::from(1u32);
+
+ // Test with an expression wrapped in parens
+ let _ = u16::from(1u8 + 1u8);
+}
+
+// The lint would suggest using `f64::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: u16) -> 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: u32) -> u64 {
+ x as u64
+ }
+ }
+}
++
++#[derive(PartialEq, Debug)]
++#[repr(i64)]
++enum Test {
++ A = u32::MAX as i64 + 1,
++}
--- /dev/null
+// run-rustfix
+
+#![allow(clippy::no_effect, clippy::unnecessary_operation, dead_code)]
+#![warn(clippy::cast_lossless)]
+
+fn main() {
+ // Test clippy::cast_lossless with casts to integer types
+ let _ = 1i8 as i16;
+ let _ = 1i8 as i32;
+ let _ = 1i8 as i64;
+ let _ = 1u8 as i16;
+ let _ = 1u8 as i32;
+ let _ = 1u8 as i64;
+ let _ = 1u8 as u16;
+ let _ = 1u8 as u32;
+ let _ = 1u8 as u64;
+ let _ = 1i16 as i32;
+ let _ = 1i16 as i64;
+ let _ = 1u16 as i32;
+ let _ = 1u16 as i64;
+ let _ = 1u16 as u32;
+ let _ = 1u16 as u64;
+ let _ = 1i32 as i64;
+ let _ = 1u32 as i64;
+ let _ = 1u32 as u64;
+
+ // Test with an expression wrapped in parens
+ let _ = (1u8 + 1u8) as u16;
+}
+
+// The lint would suggest using `f64::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: u16) -> 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: u32) -> u64 {
+ x as u64
+ }
+ }
+}
++
++#[derive(PartialEq, Debug)]
++#[repr(i64)]
++enum Test {
++ A = u32::MAX as i64 + 1,
++}
--- /dev/null
+// run-rustfix
+
++#![allow(unused)]
+#![warn(clippy::collapsible_str_replace)]
+
+fn get_filter() -> char {
+ 'u'
+}
+
+fn main() {
+ let d = 'd';
+ let p = 'p';
+ let s = 's';
+ let u = 'u';
+ let l = "l";
+
+ let mut iter = ["l", "z"].iter();
+
+ // LINT CASES
+ let _ = "hesuo worpd".replace(['s', 'u'], "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u'], l);
+
+ let _ = "hesuo worpd".replace(['s', 'u', 'p'], "l");
+
+ let _ = "hesuo worpd"
+ .replace(['s', 'u', 'p', 'd'], "l");
+
+ let _ = "hesuo world".replace([s, 'u'], "l");
+
+ let _ = "hesuo worpd".replace([s, 'u', 'p'], "l");
+
+ let _ = "hesuo worpd".replace([s, u, 'p'], "l");
+
+ let _ = "hesuo worpd".replace([s, u, p], "l");
+
+ let _ = "hesuo worlp".replace(['s', 'u'], "l").replace('p', "d");
+
+ let _ = "hesuo worpd".replace('s', "x").replace(['u', 'p'], "l");
+
+ // Note: Future iterations could lint `replace(|c| matches!(c, "su" | 'd' | 'p'), "l")`
+ let _ = "hesudo worpd".replace("su", "l").replace(['d', 'p'], "l");
+
+ let _ = "hesudo worpd".replace([d, 'p'], "l").replace("su", "l");
+
+ let _ = "hesuo world".replace([get_filter(), 's'], "l");
+
+ // NO LINT CASES
+ let _ = "hesuo world".replace('s', "l").replace('u', "p");
+
+ let _ = "hesuo worpd".replace('s', "l").replace('p', l);
+
+ let _ = "hesudo worpd".replace('d', "l").replace("su", "l").replace('p', "l");
+
+ // Note: Future iterations of `collapsible_str_replace` might lint this and combine to `[s, u, p]`
+ let _ = "hesuo worpd".replace([s, u], "l").replace([u, p], "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u'], "l").replace(['u', 'p'], "l");
+
+ let _ = "hesuo worpd".replace('s', "l").replace(['u', 'p'], "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u', 'p'], "l").replace('r', "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u', 'p'], l).replace('r', l);
+
+ let _ = "hesuo worpd".replace(['s', u, 'p'], "l").replace('r', "l");
+
+ let _ = "hesuo worpd".replace([s, u], "l").replace(p, "l");
+
+ // Regression test
+ let _ = "hesuo worpd"
+ .replace('u', iter.next().unwrap())
+ .replace('s', iter.next().unwrap());
+}
++
++#[clippy::msrv = "1.57"]
++fn msrv_1_57() {
++ let _ = "".replace('a', "1.57").replace('b', "1.57");
++}
++
++#[clippy::msrv = "1.58"]
++fn msrv_1_58() {
++ let _ = "".replace(['a', 'b'], "1.58");
++}
--- /dev/null
+// run-rustfix
+
++#![allow(unused)]
+#![warn(clippy::collapsible_str_replace)]
+
+fn get_filter() -> char {
+ 'u'
+}
+
+fn main() {
+ let d = 'd';
+ let p = 'p';
+ let s = 's';
+ let u = 'u';
+ let l = "l";
+
+ let mut iter = ["l", "z"].iter();
+
+ // LINT CASES
+ let _ = "hesuo worpd".replace('s', "l").replace('u', "l");
+
+ let _ = "hesuo worpd".replace('s', l).replace('u', l);
+
+ let _ = "hesuo worpd".replace('s', "l").replace('u', "l").replace('p', "l");
+
+ let _ = "hesuo worpd"
+ .replace('s', "l")
+ .replace('u', "l")
+ .replace('p', "l")
+ .replace('d', "l");
+
+ let _ = "hesuo world".replace(s, "l").replace('u', "l");
+
+ let _ = "hesuo worpd".replace(s, "l").replace('u', "l").replace('p', "l");
+
+ let _ = "hesuo worpd".replace(s, "l").replace(u, "l").replace('p', "l");
+
+ let _ = "hesuo worpd".replace(s, "l").replace(u, "l").replace(p, "l");
+
+ let _ = "hesuo worlp".replace('s', "l").replace('u', "l").replace('p', "d");
+
+ let _ = "hesuo worpd".replace('s', "x").replace('u', "l").replace('p', "l");
+
+ // Note: Future iterations could lint `replace(|c| matches!(c, "su" | 'd' | 'p'), "l")`
+ let _ = "hesudo worpd".replace("su", "l").replace('d', "l").replace('p', "l");
+
+ let _ = "hesudo worpd".replace(d, "l").replace('p', "l").replace("su", "l");
+
+ let _ = "hesuo world".replace(get_filter(), "l").replace('s', "l");
+
+ // NO LINT CASES
+ let _ = "hesuo world".replace('s', "l").replace('u', "p");
+
+ let _ = "hesuo worpd".replace('s', "l").replace('p', l);
+
+ let _ = "hesudo worpd".replace('d', "l").replace("su", "l").replace('p', "l");
+
+ // Note: Future iterations of `collapsible_str_replace` might lint this and combine to `[s, u, p]`
+ let _ = "hesuo worpd".replace([s, u], "l").replace([u, p], "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u'], "l").replace(['u', 'p'], "l");
+
+ let _ = "hesuo worpd".replace('s', "l").replace(['u', 'p'], "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u', 'p'], "l").replace('r', "l");
+
+ let _ = "hesuo worpd".replace(['s', 'u', 'p'], l).replace('r', l);
+
+ let _ = "hesuo worpd".replace(['s', u, 'p'], "l").replace('r', "l");
+
+ let _ = "hesuo worpd".replace([s, u], "l").replace(p, "l");
+
+ // Regression test
+ let _ = "hesuo worpd"
+ .replace('u', iter.next().unwrap())
+ .replace('s', iter.next().unwrap());
+}
++
++#[clippy::msrv = "1.57"]
++fn msrv_1_57() {
++ let _ = "".replace('a', "1.57").replace('b', "1.57");
++}
++
++#[clippy::msrv = "1.58"]
++fn msrv_1_58() {
++ let _ = "".replace('a', "1.58").replace('b', "1.58");
++}
--- /dev/null
- --> $DIR/collapsible_str_replace.rs:19:27
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:21:27
++ --> $DIR/collapsible_str_replace.rs:20:27
+ |
+LL | let _ = "hesuo worpd".replace('s', "l").replace('u', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['s', 'u'], "l")`
+ |
+ = note: `-D clippy::collapsible-str-replace` implied by `-D warnings`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:23:27
++ --> $DIR/collapsible_str_replace.rs:22:27
+ |
+LL | let _ = "hesuo worpd".replace('s', l).replace('u', l);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['s', 'u'], l)`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:26:10
++ --> $DIR/collapsible_str_replace.rs:24:27
+ |
+LL | let _ = "hesuo worpd".replace('s', "l").replace('u', "l").replace('p', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['s', 'u', 'p'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:31:27
++ --> $DIR/collapsible_str_replace.rs:27:10
+ |
+LL | .replace('s', "l")
+ | __________^
+LL | | .replace('u', "l")
+LL | | .replace('p', "l")
+LL | | .replace('d', "l");
+ | |__________________________^ help: replace with: `replace(['s', 'u', 'p', 'd'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:33:27
++ --> $DIR/collapsible_str_replace.rs:32:27
+ |
+LL | let _ = "hesuo world".replace(s, "l").replace('u', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([s, 'u'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:35:27
++ --> $DIR/collapsible_str_replace.rs:34:27
+ |
+LL | let _ = "hesuo worpd".replace(s, "l").replace('u', "l").replace('p', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([s, 'u', 'p'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:37:27
++ --> $DIR/collapsible_str_replace.rs:36:27
+ |
+LL | let _ = "hesuo worpd".replace(s, "l").replace(u, "l").replace('p', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([s, u, 'p'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:39:27
++ --> $DIR/collapsible_str_replace.rs:38:27
+ |
+LL | let _ = "hesuo worpd".replace(s, "l").replace(u, "l").replace(p, "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([s, u, p], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:41:45
++ --> $DIR/collapsible_str_replace.rs:40:27
+ |
+LL | let _ = "hesuo worlp".replace('s', "l").replace('u', "l").replace('p', "d");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['s', 'u'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:44:47
++ --> $DIR/collapsible_str_replace.rs:42:45
+ |
+LL | let _ = "hesuo worpd".replace('s', "x").replace('u', "l").replace('p', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['u', 'p'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:46:28
++ --> $DIR/collapsible_str_replace.rs:45:47
+ |
+LL | let _ = "hesudo worpd".replace("su", "l").replace('d', "l").replace('p', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['d', 'p'], "l")`
+
+error: used consecutive `str::replace` call
- --> $DIR/collapsible_str_replace.rs:48:27
++ --> $DIR/collapsible_str_replace.rs:47:28
+ |
+LL | let _ = "hesudo worpd".replace(d, "l").replace('p', "l").replace("su", "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([d, 'p'], "l")`
+
+error: used consecutive `str::replace` call
- error: aborting due to 13 previous errors
++ --> $DIR/collapsible_str_replace.rs:49:27
+ |
+LL | let _ = "hesuo world".replace(get_filter(), "l").replace('s', "l");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace([get_filter(), 's'], "l")`
+
++error: used consecutive `str::replace` call
++ --> $DIR/collapsible_str_replace.rs:86:16
++ |
++LL | let _ = "".replace('a', "1.58").replace('b', "1.58");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `replace(['a', 'b'], "1.58")`
++
++error: aborting due to 14 previous errors
+
--- /dev/null
+#![warn(clippy::explicit_counter_loop)]
+#![allow(clippy::uninlined_format_args)]
+
+fn main() {
+ let mut vec = vec![1, 2, 3, 4];
+ let mut _index = 0;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 1;
+ _index = 0;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &mut vec {
+ _index += 1;
+ }
+
+ let mut _index = 0;
+ for _v in vec {
+ _index += 1;
+ }
+}
+
+mod issue_1219 {
+ pub fn test() {
+ // should not trigger the lint because variable is used after the loop #473
+ let vec = vec![1, 2, 3];
+ let mut index = 0;
+ for _v in &vec {
+ index += 1
+ }
+ println!("index: {}", index);
+
+ // should not trigger the lint because the count is conditional #1219
+ let text = "banana";
+ let mut count = 0;
+ for ch in text.chars() {
+ println!("{}", count);
+ if ch == 'a' {
+ continue;
+ }
+ count += 1;
+ }
+
+ // should not trigger the lint because the count is conditional
+ let text = "banana";
+ let mut count = 0;
+ for ch in text.chars() {
+ println!("{}", count);
+ if ch == 'a' {
+ count += 1;
+ }
+ }
+
+ // should trigger the lint because the count is not conditional
+ let text = "banana";
+ let mut count = 0;
+ for ch in text.chars() {
+ println!("{}", count);
+ count += 1;
+ if ch == 'a' {
+ continue;
+ }
+ }
+
+ // should trigger the lint because the count is not conditional
+ let text = "banana";
+ let mut count = 0;
+ for ch in text.chars() {
+ println!("{}", count);
+ count += 1;
+ for i in 0..2 {
+ let _ = 123;
+ }
+ }
+
+ // should not trigger the lint because the count is incremented multiple times
+ let text = "banana";
+ let mut count = 0;
+ for ch in text.chars() {
+ println!("{}", count);
+ count += 1;
+ for i in 0..2 {
+ count += 1;
+ }
+ }
+ }
+}
+
+mod issue_3308 {
+ pub fn test() {
+ // should not trigger the lint because the count is incremented multiple times
+ let mut skips = 0;
+ let erasures = vec![];
+ for i in 0..10 {
+ println!("{}", skips);
+ while erasures.contains(&(i + skips)) {
+ skips += 1;
+ }
+ }
+
+ // should not trigger the lint because the count is incremented multiple times
+ let mut skips = 0;
+ for i in 0..10 {
+ println!("{}", skips);
+ let mut j = 0;
+ while j < 5 {
+ skips += 1;
+ j += 1;
+ }
+ }
+
+ // should not trigger the lint because the count is incremented multiple times
+ let mut skips = 0;
+ for i in 0..10 {
+ println!("{}", skips);
+ for j in 0..5 {
+ skips += 1;
+ }
+ }
+ }
+}
+
+mod issue_1670 {
+ pub fn test() {
+ let mut count = 0;
+ for _i in 3..10 {
+ count += 1;
+ }
+ }
+}
+
+mod issue_4732 {
+ pub fn test() {
+ let slice = &[1, 2, 3];
+ let mut index = 0;
+
+ // should not trigger the lint because the count is used after the loop
+ for _v in slice {
+ index += 1
+ }
+ let _closure = || println!("index: {}", index);
+ }
+}
+
+mod issue_4677 {
+ pub fn test() {
+ let slice = &[1, 2, 3];
+
+ // should not trigger the lint because the count is used after incremented
+ let mut count = 0;
+ for _i in slice {
+ count += 1;
+ println!("{}", count);
+ }
+ }
+}
+
+mod issue_7920 {
+ pub fn test() {
+ let slice = &[1, 2, 3];
+
+ let index_usize: usize = 0;
+ let mut idx_usize: usize = 0;
+
+ // should suggest `enumerate`
+ for _item in slice {
+ if idx_usize == index_usize {
+ break;
+ }
+
+ idx_usize += 1;
+ }
+
+ let index_u32: u32 = 0;
+ let mut idx_u32: u32 = 0;
+
+ // should suggest `zip`
+ for _item in slice {
+ if idx_u32 == index_u32 {
+ break;
+ }
+
+ idx_u32 += 1;
+ }
+ }
+}
++
++mod issue_10058 {
++ pub fn test() {
++ // should not lint since we are increasing counter potentially more than once in the loop
++ let values = [0, 1, 0, 1, 1, 1, 0, 1, 0, 1];
++ let mut counter = 0;
++ for value in values {
++ counter += 1;
++
++ if value == 0 {
++ continue;
++ }
++
++ counter += 1;
++ }
++ }
++
++ pub fn test2() {
++ // should not lint since we are increasing counter potentially more than once in the loop
++ let values = [0, 1, 0, 1, 1, 1, 0, 1, 0, 1];
++ let mut counter = 0;
++ for value in values {
++ counter += 1;
++
++ if value != 0 {
++ counter += 1;
++ }
++ }
++ }
++}
--- /dev/null
+// run-rustfix
+
++#![feature(type_alias_impl_trait)]
+#![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)
+ }
+}
+
+#[clippy::msrv = "1.40"]
+fn msrv_1_40() {
+ struct FromOverInto<T>(Vec<T>);
+
+ impl<T> Into<FromOverInto<T>> for Vec<T> {
+ fn into(self) -> FromOverInto<T> {
+ FromOverInto(self)
+ }
+ }
+}
+
+#[clippy::msrv = "1.41"]
+fn msrv_1_41() {
+ struct FromOverInto<T>(Vec<T>);
+
+ impl<T> From<Vec<T>> for FromOverInto<T> {
+ fn from(val: Vec<T>) -> Self {
+ FromOverInto(val)
+ }
+ }
+}
+
++type Opaque = impl Sized;
++struct IntoOpaque;
++impl Into<Opaque> for IntoOpaque {
++ fn into(self) -> Opaque {}
++}
++
+fn main() {}
--- /dev/null
+// run-rustfix
+
++#![feature(type_alias_impl_trait)]
+#![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)
+ }
+}
+
+#[clippy::msrv = "1.40"]
+fn msrv_1_40() {
+ struct FromOverInto<T>(Vec<T>);
+
+ impl<T> Into<FromOverInto<T>> for Vec<T> {
+ fn into(self) -> FromOverInto<T> {
+ FromOverInto(self)
+ }
+ }
+}
+
+#[clippy::msrv = "1.41"]
+fn msrv_1_41() {
+ struct FromOverInto<T>(Vec<T>);
+
+ impl<T> Into<FromOverInto<T>> for Vec<T> {
+ fn into(self) -> FromOverInto<T> {
+ FromOverInto(self)
+ }
+ }
+}
+
++type Opaque = impl Sized;
++struct IntoOpaque;
++impl Into<Opaque> for IntoOpaque {
++ fn into(self) -> Opaque {}
++}
++
+fn main() {}
--- /dev/null
- --> $DIR/from_over_into.rs:9:1
+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:17:1
++ --> $DIR/from_over_into.rs:10:1
+ |
+LL | impl Into<StringWrapper> for String {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = 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:32:1
++ --> $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:44:1
++ --> $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:77:5
++ --> $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:78:5
+ |
+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
- &x;
+// run-rustfix
+#![warn(clippy::identity_op)]
+#![allow(unused)]
+#![allow(
+ clippy::eq_op,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::op_ref,
+ clippy::double_parens,
+ clippy::uninlined_format_args
+)]
+
+use std::fmt::Write as _;
+
+const ONE: i64 = 1;
+const NEG_ONE: i64 = -1;
+const ZERO: i64 = 0;
+
+struct A(String);
+
+impl std::ops::Shl<i32> for A {
+ type Output = A;
+ fn shl(mut self, other: i32) -> Self {
+ let _ = write!(self.0, "{}", other);
+ self
+ }
+}
+
+struct Length(u8);
+struct Meter;
+
+impl core::ops::Mul<Meter> for u8 {
+ type Output = Length;
+ fn mul(self, _: Meter) -> Length {
+ Length(self)
+ }
+}
+
+#[rustfmt::skip]
+fn main() {
+ let x = 0;
+
+ x;
+ x;
+ x + 1;
+ x;
+ 1 + x;
+ x - ZERO; //no error, as we skip lookups (for now)
+ x;
+ ((ZERO)) | x; //no error, as we skip lookups (for now)
+
+ x;
+ x;
+ x / ONE; //no error, as we skip lookups (for now)
+
+ x / 2; //no false positive
+
+ x & NEG_ONE; //no error, as we skip lookups (for now)
+ x;
+
+ let u: u8 = 0;
+ u;
+
+ 1 << 0; // no error, this case is allowed, see issue 3430
+ 42;
+ 1;
+ 42;
++ x;
+ x;
+
+ let mut a = A(String::new());
+ let b = a << 0; // no error: non-integer
+
+ 1 * Meter; // no error: non-integer
+
+ 2;
+ -2;
+ 2 + x;
+ -2 + x;
+ x + 1;
+ (x + 1) % 3; // no error
+ 4 % 3; // no error
+ 4 % -3; // no error
+
+ // See #8724
+ let a = 0;
+ let b = true;
+ (if b { 1 } else { 2 });
+ (if b { 1 } else { 2 }) + if b { 3 } else { 4 };
+ (match a { 0 => 10, _ => 20 });
+ (match a { 0 => 10, _ => 20 }) + match a { 0 => 30, _ => 40 };
+ (if b { 1 } else { 2 }) + match a { 0 => 30, _ => 40 };
+ (match a { 0 => 10, _ => 20 }) + if b { 3 } else { 4 };
+ (if b { 1 } else { 2 });
+
+ ({ a }) + 3;
+ ({ a } * 2);
+ (loop { let mut c = 0; if c == 10 { break c; } c += 1; }) + { a * 2 };
+
+ fn f(_: i32) {
+ todo!();
+ }
+ f(a + { 8 * 5 });
+ f(if b { 1 } else { 2 } + 3);
+ const _: i32 = { 2 * 4 } + 3;
+ const _: i32 = { 1 + 2 * 3 } + 3;
+
+ a as usize;
+ let _ = a as usize;
+ ({ a } as usize);
+
+ 2 * { a };
+ (({ a } + 4));
+ 1;
++
++ // Issue #9904
++ let x = 0i32;
++ let _: i32 = x;
+}
+
+pub fn decide(a: bool, b: bool) -> u32 {
+ (if a { 1 } else { 2 }) + if b { 3 } else { 5 }
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::identity_op)]
+#![allow(unused)]
+#![allow(
+ clippy::eq_op,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::op_ref,
+ clippy::double_parens,
+ clippy::uninlined_format_args
+)]
+
+use std::fmt::Write as _;
+
+const ONE: i64 = 1;
+const NEG_ONE: i64 = -1;
+const ZERO: i64 = 0;
+
+struct A(String);
+
+impl std::ops::Shl<i32> for A {
+ type Output = A;
+ fn shl(mut self, other: i32) -> Self {
+ let _ = write!(self.0, "{}", other);
+ self
+ }
+}
+
+struct Length(u8);
+struct Meter;
+
+impl core::ops::Mul<Meter> for u8 {
+ type Output = Length;
+ fn mul(self, _: Meter) -> Length {
+ Length(self)
+ }
+}
+
+#[rustfmt::skip]
+fn main() {
+ let x = 0;
+
+ x + 0;
+ x + (1 - 1);
+ x + 1;
+ 0 + x;
+ 1 + x;
+ x - ZERO; //no error, as we skip lookups (for now)
+ x | (0);
+ ((ZERO)) | x; //no error, as we skip lookups (for now)
+
+ x * 1;
+ 1 * x;
+ x / ONE; //no error, as we skip lookups (for now)
+
+ x / 2; //no false positive
+
+ x & NEG_ONE; //no error, as we skip lookups (for now)
+ -1 & x;
+
+ let u: u8 = 0;
+ u & 255;
+
+ 1 << 0; // no error, this case is allowed, see issue 3430
+ 42 << 0;
+ 1 >> 0;
+ 42 >> 0;
+ &x >> 0;
+ x >> &0;
+
+ let mut a = A(String::new());
+ let b = a << 0; // no error: non-integer
+
+ 1 * Meter; // no error: non-integer
+
+ 2 % 3;
+ -2 % 3;
+ 2 % -3 + x;
+ -2 % -3 + x;
+ x + 1 % 3;
+ (x + 1) % 3; // no error
+ 4 % 3; // no error
+ 4 % -3; // no error
+
+ // See #8724
+ let a = 0;
+ let b = true;
+ 0 + if b { 1 } else { 2 };
+ 0 + if b { 1 } else { 2 } + if b { 3 } else { 4 };
+ 0 + match a { 0 => 10, _ => 20 };
+ 0 + match a { 0 => 10, _ => 20 } + match a { 0 => 30, _ => 40 };
+ 0 + if b { 1 } else { 2 } + match a { 0 => 30, _ => 40 };
+ 0 + match a { 0 => 10, _ => 20 } + if b { 3 } else { 4 };
+ (if b { 1 } else { 2 }) + 0;
+
+ 0 + { a } + 3;
+ 0 + { a } * 2;
+ 0 + loop { let mut c = 0; if c == 10 { break c; } c += 1; } + { a * 2 };
+
+ fn f(_: i32) {
+ todo!();
+ }
+ f(1 * a + { 8 * 5 });
+ f(0 + if b { 1 } else { 2 } + 3);
+ const _: i32 = { 2 * 4 } + 0 + 3;
+ const _: i32 = 0 + { 1 + 2 * 3 } + 3;
+
+ 0 + a as usize;
+ let _ = 0 + a as usize;
+ 0 + { a } as usize;
+
+ 2 * (0 + { a });
+ 1 * ({ a } + 4);
+ 1 * 1;
++
++ // Issue #9904
++ let x = 0i32;
++ let _: i32 = &x + 0;
+}
+
+pub fn decide(a: bool, b: bool) -> u32 {
+ 0 + if a { 1 } else { 2 } + if b { 3 } else { 5 }
+}
--- /dev/null
- | ^^^^^^^ help: consider reducing it to: `&x`
+error: this operation has no effect
+ --> $DIR/identity_op.rs:43:5
+ |
+LL | x + 0;
+ | ^^^^^ help: consider reducing it to: `x`
+ |
+ = note: `-D clippy::identity-op` implied by `-D warnings`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:44:5
+ |
+LL | x + (1 - 1);
+ | ^^^^^^^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:46:5
+ |
+LL | 0 + x;
+ | ^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:49:5
+ |
+LL | x | (0);
+ | ^^^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:52:5
+ |
+LL | x * 1;
+ | ^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:53:5
+ |
+LL | 1 * x;
+ | ^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:59:5
+ |
+LL | -1 & x;
+ | ^^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:62:5
+ |
+LL | u & 255;
+ | ^^^^^^^ help: consider reducing it to: `u`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:65:5
+ |
+LL | 42 << 0;
+ | ^^^^^^^ help: consider reducing it to: `42`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:66:5
+ |
+LL | 1 >> 0;
+ | ^^^^^^ help: consider reducing it to: `1`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:67:5
+ |
+LL | 42 >> 0;
+ | ^^^^^^^ help: consider reducing it to: `42`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:68:5
+ |
+LL | &x >> 0;
- --> $DIR/identity_op.rs:118:5
++ | ^^^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:69:5
+ |
+LL | x >> &0;
+ | ^^^^^^^ help: consider reducing it to: `x`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:76:5
+ |
+LL | 2 % 3;
+ | ^^^^^ help: consider reducing it to: `2`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:77:5
+ |
+LL | -2 % 3;
+ | ^^^^^^ help: consider reducing it to: `-2`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:78:5
+ |
+LL | 2 % -3 + x;
+ | ^^^^^^ help: consider reducing it to: `2`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:79:5
+ |
+LL | -2 % -3 + x;
+ | ^^^^^^^ help: consider reducing it to: `-2`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:80:9
+ |
+LL | x + 1 % 3;
+ | ^^^^^ help: consider reducing it to: `1`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:88:5
+ |
+LL | 0 + if b { 1 } else { 2 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(if b { 1 } else { 2 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:89:5
+ |
+LL | 0 + if b { 1 } else { 2 } + if b { 3 } else { 4 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(if b { 1 } else { 2 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:90:5
+ |
+LL | 0 + match a { 0 => 10, _ => 20 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(match a { 0 => 10, _ => 20 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:91:5
+ |
+LL | 0 + match a { 0 => 10, _ => 20 } + match a { 0 => 30, _ => 40 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(match a { 0 => 10, _ => 20 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:92:5
+ |
+LL | 0 + if b { 1 } else { 2 } + match a { 0 => 30, _ => 40 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(if b { 1 } else { 2 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:93:5
+ |
+LL | 0 + match a { 0 => 10, _ => 20 } + if b { 3 } else { 4 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(match a { 0 => 10, _ => 20 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:94:5
+ |
+LL | (if b { 1 } else { 2 }) + 0;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(if b { 1 } else { 2 })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:96:5
+ |
+LL | 0 + { a } + 3;
+ | ^^^^^^^^^ help: consider reducing it to: `({ a })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:97:5
+ |
+LL | 0 + { a } * 2;
+ | ^^^^^^^^^^^^^ help: consider reducing it to: `({ a } * 2)`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:98:5
+ |
+LL | 0 + loop { let mut c = 0; if c == 10 { break c; } c += 1; } + { a * 2 };
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(loop { let mut c = 0; if c == 10 { break c; } c += 1; })`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:103:7
+ |
+LL | f(1 * a + { 8 * 5 });
+ | ^^^^^ help: consider reducing it to: `a`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:104:7
+ |
+LL | f(0 + if b { 1 } else { 2 } + 3);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `if b { 1 } else { 2 }`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:105:20
+ |
+LL | const _: i32 = { 2 * 4 } + 0 + 3;
+ | ^^^^^^^^^^^^^ help: consider reducing it to: `{ 2 * 4 }`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:106:20
+ |
+LL | const _: i32 = 0 + { 1 + 2 * 3 } + 3;
+ | ^^^^^^^^^^^^^^^^^ help: consider reducing it to: `{ 1 + 2 * 3 }`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:108:5
+ |
+LL | 0 + a as usize;
+ | ^^^^^^^^^^^^^^ help: consider reducing it to: `a as usize`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:109:13
+ |
+LL | let _ = 0 + a as usize;
+ | ^^^^^^^^^^^^^^ help: consider reducing it to: `a as usize`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:110:5
+ |
+LL | 0 + { a } as usize;
+ | ^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `({ a } as usize)`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:112:9
+ |
+LL | 2 * (0 + { a });
+ | ^^^^^^^^^^^ help: consider reducing it to: `{ a }`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:113:5
+ |
+LL | 1 * ({ a } + 4);
+ | ^^^^^^^^^^^^^^^ help: consider reducing it to: `(({ a } + 4))`
+
+error: this operation has no effect
+ --> $DIR/identity_op.rs:114:5
+ |
+LL | 1 * 1;
+ | ^^^^^ help: consider reducing it to: `1`
+
+error: this operation has no effect
- error: aborting due to 39 previous errors
++ --> $DIR/identity_op.rs:118:18
++ |
++LL | let _: i32 = &x + 0;
++ | ^^^^^^ help: consider reducing it to: `x`
++
++error: this operation has no effect
++ --> $DIR/identity_op.rs:122:5
+ |
+LL | 0 + if a { 1 } else { 2 } + if b { 3 } else { 5 }
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider reducing it to: `(if a { 1 } else { 2 })`
+
++error: aborting due to 40 previous errors
+
--- /dev/null
+// run-rustfix
+#![warn(clippy::implicit_clone)]
+#![allow(clippy::clone_on_copy, clippy::redundant_clone)]
+use std::borrow::Borrow;
+use std::ffi::{OsStr, OsString};
+use std::path::PathBuf;
+
+fn return_owned_from_slice(slice: &[u32]) -> Vec<u32> {
+ slice.to_owned()
+}
+
+pub fn own_same<T>(v: T) -> T
+where
+ T: ToOwned<Owned = T>,
+{
+ v.to_owned()
+}
+
+pub fn own_same_from_ref<T>(v: &T) -> T
+where
+ T: ToOwned<Owned = T>,
+{
+ v.to_owned()
+}
+
+pub fn own_different<T, U>(v: T) -> U
+where
+ T: ToOwned<Owned = U>,
+{
+ v.to_owned()
+}
+
+#[derive(Copy, Clone)]
+struct Kitten;
+impl Kitten {
+ // badly named method
+ fn to_vec(self) -> Kitten {
+ Kitten {}
+ }
+}
+impl Borrow<BorrowedKitten> for Kitten {
+ fn borrow(&self) -> &BorrowedKitten {
+ static VALUE: BorrowedKitten = BorrowedKitten {};
+ &VALUE
+ }
+}
+
+struct BorrowedKitten;
+impl ToOwned for BorrowedKitten {
+ type Owned = Kitten;
+ fn to_owned(&self) -> Kitten {
+ Kitten {}
+ }
+}
+
+mod weird {
+ #[allow(clippy::ptr_arg)]
+ pub fn to_vec(v: &Vec<u32>) -> Vec<u32> {
+ v.clone()
+ }
+}
+
+fn main() {
+ let vec = vec![5];
+ let _ = return_owned_from_slice(&vec);
+ let _ = vec.clone();
+ let _ = vec.clone();
+
+ let vec_ref = &vec;
+ let _ = return_owned_from_slice(vec_ref);
+ let _ = vec_ref.clone();
+ let _ = vec_ref.clone();
+
+ // we expect no lint for this
+ let _ = weird::to_vec(&vec);
+
+ // we expect no lints for this
+ let slice: &[u32] = &[1, 2, 3, 4, 5];
+ let _ = return_owned_from_slice(slice);
+ let _ = slice.to_owned();
+ let _ = slice.to_vec();
+
+ let str = "hello world".to_string();
+ let _ = str.clone();
+
+ // testing w/ an arbitrary type
+ let kitten = Kitten {};
+ let _ = kitten.clone();
+ let _ = own_same_from_ref(&kitten);
+ // this shouln't lint
+ let _ = kitten.to_vec();
+
+ // we expect no lints for this
+ let borrowed = BorrowedKitten {};
+ let _ = borrowed.to_owned();
+
+ let pathbuf = PathBuf::new();
+ let _ = pathbuf.clone();
+ let _ = pathbuf.clone();
+
+ let os_string = OsString::from("foo");
+ let _ = os_string.clone();
+ let _ = os_string.clone();
+
+ // we expect no lints for this
+ let os_str = OsStr::new("foo");
+ let _ = os_str.to_owned();
+ let _ = os_str.to_os_string();
+
+ // issue #8227
+ let pathbuf_ref = &pathbuf;
+ let pathbuf_ref = &pathbuf_ref;
+ let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&PathBuf`
+ let _ = (*pathbuf_ref).clone();
+ let pathbuf_ref = &pathbuf_ref;
+ let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&&PathBuf`
+ let _ = (**pathbuf_ref).clone();
++
++ struct NoClone;
++ impl ToOwned for NoClone {
++ type Owned = Self;
++ fn to_owned(&self) -> Self {
++ NoClone
++ }
++ }
++ let no_clone = &NoClone;
++ let _ = no_clone.to_owned();
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::implicit_clone)]
+#![allow(clippy::clone_on_copy, clippy::redundant_clone)]
+use std::borrow::Borrow;
+use std::ffi::{OsStr, OsString};
+use std::path::PathBuf;
+
+fn return_owned_from_slice(slice: &[u32]) -> Vec<u32> {
+ slice.to_owned()
+}
+
+pub fn own_same<T>(v: T) -> T
+where
+ T: ToOwned<Owned = T>,
+{
+ v.to_owned()
+}
+
+pub fn own_same_from_ref<T>(v: &T) -> T
+where
+ T: ToOwned<Owned = T>,
+{
+ v.to_owned()
+}
+
+pub fn own_different<T, U>(v: T) -> U
+where
+ T: ToOwned<Owned = U>,
+{
+ v.to_owned()
+}
+
+#[derive(Copy, Clone)]
+struct Kitten;
+impl Kitten {
+ // badly named method
+ fn to_vec(self) -> Kitten {
+ Kitten {}
+ }
+}
+impl Borrow<BorrowedKitten> for Kitten {
+ fn borrow(&self) -> &BorrowedKitten {
+ static VALUE: BorrowedKitten = BorrowedKitten {};
+ &VALUE
+ }
+}
+
+struct BorrowedKitten;
+impl ToOwned for BorrowedKitten {
+ type Owned = Kitten;
+ fn to_owned(&self) -> Kitten {
+ Kitten {}
+ }
+}
+
+mod weird {
+ #[allow(clippy::ptr_arg)]
+ pub fn to_vec(v: &Vec<u32>) -> Vec<u32> {
+ v.clone()
+ }
+}
+
+fn main() {
+ let vec = vec![5];
+ let _ = return_owned_from_slice(&vec);
+ let _ = vec.to_owned();
+ let _ = vec.to_vec();
+
+ let vec_ref = &vec;
+ let _ = return_owned_from_slice(vec_ref);
+ let _ = vec_ref.to_owned();
+ let _ = vec_ref.to_vec();
+
+ // we expect no lint for this
+ let _ = weird::to_vec(&vec);
+
+ // we expect no lints for this
+ let slice: &[u32] = &[1, 2, 3, 4, 5];
+ let _ = return_owned_from_slice(slice);
+ let _ = slice.to_owned();
+ let _ = slice.to_vec();
+
+ let str = "hello world".to_string();
+ let _ = str.to_owned();
+
+ // testing w/ an arbitrary type
+ let kitten = Kitten {};
+ let _ = kitten.to_owned();
+ let _ = own_same_from_ref(&kitten);
+ // this shouln't lint
+ let _ = kitten.to_vec();
+
+ // we expect no lints for this
+ let borrowed = BorrowedKitten {};
+ let _ = borrowed.to_owned();
+
+ let pathbuf = PathBuf::new();
+ let _ = pathbuf.to_owned();
+ let _ = pathbuf.to_path_buf();
+
+ let os_string = OsString::from("foo");
+ let _ = os_string.to_owned();
+ let _ = os_string.to_os_string();
+
+ // we expect no lints for this
+ let os_str = OsStr::new("foo");
+ let _ = os_str.to_owned();
+ let _ = os_str.to_os_string();
+
+ // issue #8227
+ let pathbuf_ref = &pathbuf;
+ let pathbuf_ref = &pathbuf_ref;
+ let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&PathBuf`
+ let _ = pathbuf_ref.to_path_buf();
+ let pathbuf_ref = &pathbuf_ref;
+ let _ = pathbuf_ref.to_owned(); // Don't lint. Returns `&&PathBuf`
+ let _ = pathbuf_ref.to_path_buf();
++
++ struct NoClone;
++ impl ToOwned for NoClone {
++ type Owned = Self;
++ fn to_owned(&self) -> Self {
++ NoClone
++ }
++ }
++ let no_clone = &NoClone;
++ let _ = no_clone.to_owned();
+}
--- /dev/null
- const REF: &i32 = &ARR[idx()]; // Ok, should not produce stderr.
+#![feature(inline_const)]
+#![warn(clippy::indexing_slicing)]
+// We also check the out_of_bounds_indexing lint here, because it lints similar things and
+// we want to avoid false positives.
+#![warn(clippy::out_of_bounds_indexing)]
+#![allow(unconditional_panic, clippy::no_effect, clippy::unnecessary_operation)]
+
+const ARR: [i32; 2] = [1, 2];
- const { &ARR[idx()] }; // Ok, should not produce stderr.
- const { &ARR[idx4()] }; // Ok, let rustc handle const contexts.
++const REF: &i32 = &ARR[idx()]; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
+const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
+
+const fn idx() -> usize {
+ 1
+}
+const fn idx4() -> usize {
+ 4
+}
+
+fn main() {
+ let x = [1, 2, 3, 4];
+ let index: usize = 1;
+ x[index];
+ x[4]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
+ x[1 << 3]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
+
+ x[0]; // Ok, should not produce stderr.
+ x[3]; // Ok, should not produce stderr.
+ x[const { idx() }]; // Ok, should not produce stderr.
+ x[const { idx4() }]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
++ const { &ARR[idx()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
++ const { &ARR[idx4()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
+
+ let y = &x;
+ y[0]; // Ok, referencing shouldn't affect this lint. See the issue 6021
+ y[4]; // Ok, rustc will handle references too.
+
+ let v = vec![0; 5];
+ v[0];
+ v[10];
+ v[1 << 3];
+
+ const N: usize = 15; // Out of bounds
+ const M: usize = 3; // In bounds
+ x[N]; // Ok, let rustc's `unconditional_panic` lint handle `usize` indexing on arrays.
+ x[M]; // Ok, should not produce stderr.
+ v[N];
+ v[M];
+}
--- /dev/null
- LL | const { &ARR[idx4()] }; // Ok, let rustc handle const contexts.
++error: indexing may panic
++ --> $DIR/indexing_slicing_index.rs:9:20
++ |
++LL | const REF: &i32 = &ARR[idx()]; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
++ | ^^^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++ = note: the suggestion might not be applicable in constant blocks
++ = note: `-D clippy::indexing-slicing` implied by `-D warnings`
++
++error: indexing may panic
++ --> $DIR/indexing_slicing_index.rs:10:24
++ |
++LL | const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
++ | ^^^^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++ = note: the suggestion might not be applicable in constant blocks
++
+error[E0080]: evaluation of `main::{constant#3}` failed
+ --> $DIR/indexing_slicing_index.rs:31:14
+ |
- LL | const { &ARR[idx4()] }; // Ok, let rustc handle const contexts.
++LL | const { &ARR[idx4()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
+ | ^^^^^^^^^^^ index out of bounds: the length is 2 but the index is 4
+
+note: erroneous constant used
+ --> $DIR/indexing_slicing_index.rs:31:5
+ |
- = note: `-D clippy::indexing-slicing` implied by `-D warnings`
++LL | const { &ARR[idx4()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
+ | ^^^^^^^^^^^^^^^^^^^^^^
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:22:5
+ |
+LL | x[index];
+ | ^^^^^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
- error: aborting due to 8 previous errors
++
++error: indexing may panic
++ --> $DIR/indexing_slicing_index.rs:30:14
++ |
++LL | const { &ARR[idx()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
++ | ^^^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++ = note: the suggestion might not be applicable in constant blocks
++
++error: indexing may panic
++ --> $DIR/indexing_slicing_index.rs:31:14
++ |
++LL | const { &ARR[idx4()] }; // This should be linted, since `suppress-restriction-lint-in-const` default is false.
++ | ^^^^^^^^^^^
++ |
++ = help: consider using `.get(n)` or `.get_mut(n)` instead
++ = note: the suggestion might not be applicable in constant blocks
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:38:5
+ |
+LL | v[0];
+ | ^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:39:5
+ |
+LL | v[10];
+ | ^^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:40:5
+ |
+LL | v[1 << 3];
+ | ^^^^^^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:46:5
+ |
+LL | v[N];
+ | ^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
+
+error: indexing may panic
+ --> $DIR/indexing_slicing_index.rs:47:5
+ |
+LL | v[M];
+ | ^^^^
+ |
+ = help: consider using `.get(n)` or `.get_mut(n)` instead
+
+error[E0080]: evaluation of constant value failed
+ --> $DIR/indexing_slicing_index.rs:10:24
+ |
+LL | const REF_ERR: &i32 = &ARR[idx4()]; // Ok, let rustc handle const contexts.
+ | ^^^^^^^^^^^ index out of bounds: the length is 2 but the index is 4
+
++error: aborting due to 12 previous errors
+
+For more information about this error, try `rustc --explain E0080`.
--- /dev/null
+// run-rustfix
+
+#![warn(clippy::len_zero)]
+#![allow(dead_code, unused, clippy::len_without_is_empty)]
+
++extern crate core;
++use core::ops::Deref;
++
+pub struct One;
+struct Wither;
+
+trait TraitsToo {
+ fn len(&self) -> isize;
+ // No error; `len` is private; see issue #1085.
+}
+
+impl TraitsToo for One {
+ fn len(&self) -> isize {
+ 0
+ }
+}
+
+pub struct HasIsEmpty;
+
+impl HasIsEmpty {
+ pub fn len(&self) -> isize {
+ 1
+ }
+
+ fn is_empty(&self) -> bool {
+ false
+ }
+}
+
+pub struct HasWrongIsEmpty;
+
+impl HasWrongIsEmpty {
+ pub fn len(&self) -> isize {
+ 1
+ }
+
+ pub fn is_empty(&self, x: u32) -> bool {
+ false
+ }
+}
+
+pub trait WithIsEmpty {
+ fn len(&self) -> isize;
+ fn is_empty(&self) -> bool;
+}
+
+impl WithIsEmpty for Wither {
+ fn len(&self) -> isize {
+ 1
+ }
+
+ fn is_empty(&self) -> bool {
+ false
+ }
+}
+
++struct DerefToDerefToString;
++
++impl Deref for DerefToDerefToString {
++ type Target = DerefToString;
++
++ fn deref(&self) -> &Self::Target {
++ &DerefToString {}
++ }
++}
++
++struct DerefToString;
++
++impl Deref for DerefToString {
++ type Target = str;
++
++ fn deref(&self) -> &Self::Target {
++ "Hello, world!"
++ }
++}
++
+fn main() {
+ let x = [1, 2];
+ if x.is_empty() {
+ println!("This should not happen!");
+ }
+
+ if "".is_empty() {}
+
++ let s = "Hello, world!";
++ let s1 = &s;
++ let s2 = &s1;
++ let s3 = &s2;
++ let s4 = &s3;
++ let s5 = &s4;
++ let s6 = &s5;
++ println!("{}", s1.is_empty());
++ println!("{}", s2.is_empty());
++ println!("{}", s3.is_empty());
++ println!("{}", s4.is_empty());
++ println!("{}", s5.is_empty());
++ println!("{}", (s6).is_empty());
++
++ let d2s = DerefToDerefToString {};
++ println!("{}", (**d2s).is_empty());
++
+ let y = One;
+ if y.len() == 0 {
+ // No error; `One` does not have `.is_empty()`.
+ println!("This should not happen either!");
+ }
+
+ let z: &dyn TraitsToo = &y;
+ if z.len() > 0 {
+ // No error; `TraitsToo` has no `.is_empty()` method.
+ println!("Nor should this!");
+ }
+
+ let has_is_empty = HasIsEmpty;
+ if has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if has_is_empty.len() > 1 {
+ // No error.
+ println!("This can happen.");
+ }
+ if has_is_empty.len() <= 1 {
+ // No error.
+ println!("This can happen.");
+ }
+ if has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if !has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if has_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ if 1 < has_is_empty.len() {
+ // No error.
+ println!("This can happen.");
+ }
+ if 1 >= has_is_empty.len() {
+ // No error.
+ println!("This can happen.");
+ }
+ assert!(!has_is_empty.is_empty());
+
+ let with_is_empty: &dyn WithIsEmpty = &Wither;
+ if with_is_empty.is_empty() {
+ println!("Or this!");
+ }
+ assert!(!with_is_empty.is_empty());
+
+ let has_wrong_is_empty = HasWrongIsEmpty;
+ if has_wrong_is_empty.len() == 0 {
+ // No error; `HasWrongIsEmpty` does not have `.is_empty()`.
+ println!("Or this!");
+ }
+}
+
+fn test_slice(b: &[u8]) {
+ if !b.is_empty() {}
+}
--- /dev/null
+// run-rustfix
+
+#![warn(clippy::len_zero)]
+#![allow(dead_code, unused, clippy::len_without_is_empty)]
+
++extern crate core;
++use core::ops::Deref;
++
+pub struct One;
+struct Wither;
+
+trait TraitsToo {
+ fn len(&self) -> isize;
+ // No error; `len` is private; see issue #1085.
+}
+
+impl TraitsToo for One {
+ fn len(&self) -> isize {
+ 0
+ }
+}
+
+pub struct HasIsEmpty;
+
+impl HasIsEmpty {
+ pub fn len(&self) -> isize {
+ 1
+ }
+
+ fn is_empty(&self) -> bool {
+ false
+ }
+}
+
+pub struct HasWrongIsEmpty;
+
+impl HasWrongIsEmpty {
+ pub fn len(&self) -> isize {
+ 1
+ }
+
+ pub fn is_empty(&self, x: u32) -> bool {
+ false
+ }
+}
+
+pub trait WithIsEmpty {
+ fn len(&self) -> isize;
+ fn is_empty(&self) -> bool;
+}
+
+impl WithIsEmpty for Wither {
+ fn len(&self) -> isize {
+ 1
+ }
+
+ fn is_empty(&self) -> bool {
+ false
+ }
+}
+
++struct DerefToDerefToString;
++
++impl Deref for DerefToDerefToString {
++ type Target = DerefToString;
++
++ fn deref(&self) -> &Self::Target {
++ &DerefToString {}
++ }
++}
++
++struct DerefToString;
++
++impl Deref for DerefToString {
++ type Target = str;
++
++ fn deref(&self) -> &Self::Target {
++ "Hello, world!"
++ }
++}
++
+fn main() {
+ let x = [1, 2];
+ if x.len() == 0 {
+ println!("This should not happen!");
+ }
+
+ if "".len() == 0 {}
+
++ let s = "Hello, world!";
++ let s1 = &s;
++ let s2 = &s1;
++ let s3 = &s2;
++ let s4 = &s3;
++ let s5 = &s4;
++ let s6 = &s5;
++ println!("{}", *s1 == "");
++ println!("{}", **s2 == "");
++ println!("{}", ***s3 == "");
++ println!("{}", ****s4 == "");
++ println!("{}", *****s5 == "");
++ println!("{}", ******(s6) == "");
++
++ let d2s = DerefToDerefToString {};
++ println!("{}", &**d2s == "");
++
+ let y = One;
+ if y.len() == 0 {
+ // No error; `One` does not have `.is_empty()`.
+ println!("This should not happen either!");
+ }
+
+ let z: &dyn TraitsToo = &y;
+ if z.len() > 0 {
+ // No error; `TraitsToo` has no `.is_empty()` method.
+ println!("Nor should this!");
+ }
+
+ let has_is_empty = HasIsEmpty;
+ if has_is_empty.len() == 0 {
+ println!("Or this!");
+ }
+ if has_is_empty.len() != 0 {
+ println!("Or this!");
+ }
+ if has_is_empty.len() > 0 {
+ println!("Or this!");
+ }
+ if has_is_empty.len() < 1 {
+ println!("Or this!");
+ }
+ if has_is_empty.len() >= 1 {
+ println!("Or this!");
+ }
+ if has_is_empty.len() > 1 {
+ // No error.
+ println!("This can happen.");
+ }
+ if has_is_empty.len() <= 1 {
+ // No error.
+ println!("This can happen.");
+ }
+ if 0 == has_is_empty.len() {
+ println!("Or this!");
+ }
+ if 0 != has_is_empty.len() {
+ println!("Or this!");
+ }
+ if 0 < has_is_empty.len() {
+ println!("Or this!");
+ }
+ if 1 <= has_is_empty.len() {
+ println!("Or this!");
+ }
+ if 1 > has_is_empty.len() {
+ println!("Or this!");
+ }
+ if 1 < has_is_empty.len() {
+ // No error.
+ println!("This can happen.");
+ }
+ if 1 >= has_is_empty.len() {
+ // No error.
+ println!("This can happen.");
+ }
+ assert!(!has_is_empty.is_empty());
+
+ let with_is_empty: &dyn WithIsEmpty = &Wither;
+ if with_is_empty.len() == 0 {
+ println!("Or this!");
+ }
+ assert!(!with_is_empty.is_empty());
+
+ let has_wrong_is_empty = HasWrongIsEmpty;
+ if has_wrong_is_empty.len() == 0 {
+ // No error; `HasWrongIsEmpty` does not have `.is_empty()`.
+ println!("Or this!");
+ }
+}
+
+fn test_slice(b: &[u8]) {
+ if b.len() != 0 {}
+}
--- /dev/null
- --> $DIR/len_zero.rs:61:8
+error: length comparison to zero
- --> $DIR/len_zero.rs:65:8
++ --> $DIR/len_zero.rs:84:8
+ |
+LL | if x.len() == 0 {
+ | ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `x.is_empty()`
+ |
+ = note: `-D clippy::len-zero` implied by `-D warnings`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:80:8
++ --> $DIR/len_zero.rs:88:8
+ |
+LL | if "".len() == 0 {}
+ | ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `"".is_empty()`
+
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:97:20
++ |
++LL | println!("{}", *s1 == "");
++ | ^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `s1.is_empty()`
++ |
++ = note: `-D clippy::comparison-to-empty` implied by `-D warnings`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:98:20
++ |
++LL | println!("{}", **s2 == "");
++ | ^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `s2.is_empty()`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:99:20
++ |
++LL | println!("{}", ***s3 == "");
++ | ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `s3.is_empty()`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:100:20
++ |
++LL | println!("{}", ****s4 == "");
++ | ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `s4.is_empty()`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:101:20
++ |
++LL | println!("{}", *****s5 == "");
++ | ^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `s5.is_empty()`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:102:20
++ |
++LL | println!("{}", ******(s6) == "");
++ | ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `(s6).is_empty()`
++
++error: comparison to empty slice
++ --> $DIR/len_zero.rs:105:20
++ |
++LL | println!("{}", &**d2s == "");
++ | ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `(**d2s).is_empty()`
++
+error: length comparison to zero
- --> $DIR/len_zero.rs:83:8
++ --> $DIR/len_zero.rs:120:8
+ |
+LL | if has_is_empty.len() == 0 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:86:8
++ --> $DIR/len_zero.rs:123:8
+ |
+LL | if has_is_empty.len() != 0 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:89:8
++ --> $DIR/len_zero.rs:126:8
+ |
+LL | if has_is_empty.len() > 0 {
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to one
- --> $DIR/len_zero.rs:92:8
++ --> $DIR/len_zero.rs:129:8
+ |
+LL | if has_is_empty.len() < 1 {
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `has_is_empty.is_empty()`
+
+error: length comparison to one
- --> $DIR/len_zero.rs:103:8
++ --> $DIR/len_zero.rs:132:8
+ |
+LL | if has_is_empty.len() >= 1 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:106:8
++ --> $DIR/len_zero.rs:143:8
+ |
+LL | if 0 == has_is_empty.len() {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:109:8
++ --> $DIR/len_zero.rs:146:8
+ |
+LL | if 0 != has_is_empty.len() {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:112:8
++ --> $DIR/len_zero.rs:149:8
+ |
+LL | if 0 < has_is_empty.len() {
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to one
- --> $DIR/len_zero.rs:115:8
++ --> $DIR/len_zero.rs:152:8
+ |
+LL | if 1 <= has_is_empty.len() {
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!has_is_empty.is_empty()`
+
+error: length comparison to one
- --> $DIR/len_zero.rs:129:8
++ --> $DIR/len_zero.rs:155:8
+ |
+LL | if 1 > has_is_empty.len() {
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `has_is_empty.is_empty()`
+
+error: length comparison to zero
- --> $DIR/len_zero.rs:142:8
++ --> $DIR/len_zero.rs:169:8
+ |
+LL | if with_is_empty.len() == 0 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `with_is_empty.is_empty()`
+
+error: length comparison to zero
- error: aborting due to 14 previous errors
++ --> $DIR/len_zero.rs:182:8
+ |
+LL | if b.len() != 0 {}
+ | ^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!b.is_empty()`
+
++error: aborting due to 21 previous errors
+
--- /dev/null
+// 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);
+ 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");
+ }
+ assert!(!a.is_empty(), "with expansion {}", one!());
++ if a.is_empty() {
++ let _ = 0;
++ } else if a.len() == 1 {
++ panic!("panic6");
++ }
+}
+
+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
+// 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!());
++ if a.is_empty() {
++ let _ = 0;
++ } else if a.len() == 1 {
++ panic!("panic6");
++ }
+}
+
+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
- --> $DIR/manual_assert.rs:73:5
+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: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:66:5
+ |
+LL | / if a.is_empty() {
+LL | | panic!("with expansion {}", one!())
+LL | | }
+ | |_____^ help: try instead: `assert!(!a.is_empty(), "with expansion {}", one!());`
+
+error: only a `panic!` in `if`-then statement
++ --> $DIR/manual_assert.rs:78:5
+ |
+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
+
--- /dev/null
+// 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!())
+ }
++ if a.is_empty() {
++ let _ = 0;
++ } else if a.len() == 1 {
++ panic!("panic6");
++ }
+}
+
+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
+// run-rustfix
+
+#![allow(unused, dead_code)]
+#![warn(clippy::manual_is_ascii_check)]
+
+fn main() {
+ assert!('x'.is_ascii_lowercase());
+ assert!('X'.is_ascii_uppercase());
+ assert!(b'x'.is_ascii_lowercase());
+ assert!(b'X'.is_ascii_uppercase());
+
+ let num = '2';
+ assert!(num.is_ascii_digit());
+ assert!(b'1'.is_ascii_digit());
+ assert!('x'.is_ascii_alphabetic());
+
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z' | '_'));
++
++ b'0'.is_ascii_digit();
++ b'a'.is_ascii_lowercase();
++ b'A'.is_ascii_uppercase();
++
++ '0'.is_ascii_digit();
++ 'a'.is_ascii_lowercase();
++ 'A'.is_ascii_uppercase();
++
++ let cool_letter = &'g';
++ cool_letter.is_ascii_digit();
++ cool_letter.is_ascii_lowercase();
++ cool_letter.is_ascii_uppercase();
+}
+
+#[clippy::msrv = "1.23"]
+fn msrv_1_23() {
+ assert!(matches!(b'1', b'0'..=b'9'));
+ assert!(matches!('X', 'A'..='Z'));
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+}
+
+#[clippy::msrv = "1.24"]
+fn msrv_1_24() {
+ assert!(b'1'.is_ascii_digit());
+ assert!('X'.is_ascii_uppercase());
+ assert!('x'.is_ascii_alphabetic());
+}
+
+#[clippy::msrv = "1.46"]
+fn msrv_1_46() {
+ const FOO: bool = matches!('x', '0'..='9');
+}
+
+#[clippy::msrv = "1.47"]
+fn msrv_1_47() {
+ const FOO: bool = 'x'.is_ascii_digit();
+}
--- /dev/null
+// run-rustfix
+
+#![allow(unused, dead_code)]
+#![warn(clippy::manual_is_ascii_check)]
+
+fn main() {
+ assert!(matches!('x', 'a'..='z'));
+ assert!(matches!('X', 'A'..='Z'));
+ assert!(matches!(b'x', b'a'..=b'z'));
+ assert!(matches!(b'X', b'A'..=b'Z'));
+
+ let num = '2';
+ assert!(matches!(num, '0'..='9'));
+ assert!(matches!(b'1', b'0'..=b'9'));
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z' | '_'));
++
++ (b'0'..=b'9').contains(&b'0');
++ (b'a'..=b'z').contains(&b'a');
++ (b'A'..=b'Z').contains(&b'A');
++
++ ('0'..='9').contains(&'0');
++ ('a'..='z').contains(&'a');
++ ('A'..='Z').contains(&'A');
++
++ let cool_letter = &'g';
++ ('0'..='9').contains(cool_letter);
++ ('a'..='z').contains(cool_letter);
++ ('A'..='Z').contains(cool_letter);
+}
+
+#[clippy::msrv = "1.23"]
+fn msrv_1_23() {
+ assert!(matches!(b'1', b'0'..=b'9'));
+ assert!(matches!('X', 'A'..='Z'));
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+}
+
+#[clippy::msrv = "1.24"]
+fn msrv_1_24() {
+ assert!(matches!(b'1', b'0'..=b'9'));
+ assert!(matches!('X', 'A'..='Z'));
+ assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+}
+
+#[clippy::msrv = "1.46"]
+fn msrv_1_46() {
+ const FOO: bool = matches!('x', '0'..='9');
+}
+
+#[clippy::msrv = "1.47"]
+fn msrv_1_47() {
+ const FOO: bool = matches!('x', '0'..='9');
+}
--- /dev/null
- --> $DIR/manual_is_ascii_check.rs:29:13
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:7:13
+ |
+LL | assert!(matches!('x', 'a'..='z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'x'.is_ascii_lowercase()`
+ |
+ = note: `-D clippy::manual-is-ascii-check` implied by `-D warnings`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:8:13
+ |
+LL | assert!(matches!('X', 'A'..='Z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'X'.is_ascii_uppercase()`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:9:13
+ |
+LL | assert!(matches!(b'x', b'a'..=b'z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'x'.is_ascii_lowercase()`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:10:13
+ |
+LL | assert!(matches!(b'X', b'A'..=b'Z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'X'.is_ascii_uppercase()`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:13:13
+ |
+LL | assert!(matches!(num, '0'..='9'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `num.is_ascii_digit()`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:14:13
+ |
+LL | assert!(matches!(b'1', b'0'..=b'9'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'1'.is_ascii_digit()`
+
+error: manual check for common ascii range
+ --> $DIR/manual_is_ascii_check.rs:15:13
+ |
+LL | assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'x'.is_ascii_alphabetic()`
+
+error: manual check for common ascii range
- --> $DIR/manual_is_ascii_check.rs:30:13
++ --> $DIR/manual_is_ascii_check.rs:19:5
++ |
++LL | (b'0'..=b'9').contains(&b'0');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'0'.is_ascii_digit()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:20:5
++ |
++LL | (b'a'..=b'z').contains(&b'a');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'a'.is_ascii_lowercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:21:5
++ |
++LL | (b'A'..=b'Z').contains(&b'A');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'A'.is_ascii_uppercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:23:5
++ |
++LL | ('0'..='9').contains(&'0');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'0'.is_ascii_digit()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:24:5
++ |
++LL | ('a'..='z').contains(&'a');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'a'.is_ascii_lowercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:25:5
++ |
++LL | ('A'..='Z').contains(&'A');
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'A'.is_ascii_uppercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:28:5
++ |
++LL | ('0'..='9').contains(cool_letter);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cool_letter.is_ascii_digit()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:29:5
++ |
++LL | ('a'..='z').contains(cool_letter);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cool_letter.is_ascii_lowercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:30:5
++ |
++LL | ('A'..='Z').contains(cool_letter);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cool_letter.is_ascii_uppercase()`
++
++error: manual check for common ascii range
++ --> $DIR/manual_is_ascii_check.rs:42:13
+ |
+LL | assert!(matches!(b'1', b'0'..=b'9'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `b'1'.is_ascii_digit()`
+
+error: manual check for common ascii range
- --> $DIR/manual_is_ascii_check.rs:31:13
++ --> $DIR/manual_is_ascii_check.rs:43:13
+ |
+LL | assert!(matches!('X', 'A'..='Z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'X'.is_ascii_uppercase()`
+
+error: manual check for common ascii range
- --> $DIR/manual_is_ascii_check.rs:41:23
++ --> $DIR/manual_is_ascii_check.rs:44:13
+ |
+LL | assert!(matches!('x', 'A'..='Z' | 'a'..='z'));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'x'.is_ascii_alphabetic()`
+
+error: manual check for common ascii range
- error: aborting due to 11 previous errors
++ --> $DIR/manual_is_ascii_check.rs:54:23
+ |
+LL | const FOO: bool = matches!('x', '0'..='9');
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'x'.is_ascii_digit()`
+
++error: aborting due to 20 previous errors
+
--- /dev/null
+#![allow(unused_braces, unused_variables, dead_code)]
+#![allow(clippy::collapsible_else_if, clippy::let_unit_value)]
+#![warn(clippy::manual_let_else)]
+// Ensure that we don't conflict with match -> if let lints
+#![warn(clippy::single_match_else, clippy::single_match)]
+
+fn f() -> Result<u32, u32> {
+ Ok(0)
+}
+
+fn g() -> Option<()> {
+ None
+}
+
+fn h() -> (Option<()>, Option<()>) {
+ (None, None)
+}
+
+enum Variant {
+ Foo,
+ Bar(u32),
+ Baz(u32),
+}
+
+fn build_enum() -> Variant {
+ Variant::Foo
+}
+
+fn main() {}
+
+fn fire() {
+ let v = match g() {
+ Some(v_some) => v_some,
+ None => return,
+ };
+
+ let v = match g() {
+ Some(v_some) => v_some,
+ _ => return,
+ };
+
+ loop {
+ // More complex pattern for the identity arm and diverging arm
+ let v = match h() {
+ (Some(_), Some(_)) | (None, None) => continue,
+ (Some(v), None) | (None, Some(v)) => v,
+ };
+ // Custom enums are supported as long as the "else" arm is a simple _
+ let v = match build_enum() {
+ _ => continue,
+ Variant::Bar(v) | Variant::Baz(v) => v,
+ };
+ }
+
+ // There is a _ in the diverging arm
+ // TODO also support unused bindings aka _v
+ let v = match f() {
+ Ok(v) => v,
+ Err(_) => return,
+ };
+
+ // Err(()) is an allowed pattern
+ let v = match f().map_err(|_| ()) {
+ Ok(v) => v,
+ Err(()) => return,
+ };
++
++ let f = Variant::Bar(1);
++
++ let _value = match f {
++ Variant::Bar(_) | Variant::Baz(_) => (),
++ _ => return,
++ };
+}
+
+fn not_fire() {
+ // Multiple diverging arms
+ let v = match h() {
+ _ => panic!(),
+ (None, Some(_v)) => return,
+ (Some(v), None) => v,
+ };
+
+ // Multiple identity arms
+ let v = match h() {
+ _ => panic!(),
+ (None, Some(v)) => v,
+ (Some(v), None) => v,
+ };
+
+ // No diverging arm at all, only identity arms.
+ // This is no case for let else, but destructuring assignment.
+ let v = match f() {
+ Ok(v) => v,
+ Err(e) => e,
+ };
+
+ // The identity arm has a guard
+ let v = match g() {
+ Some(v) if g().is_none() => v,
+ _ => return,
+ };
+
+ // The diverging arm has a guard
+ let v = match f() {
+ Err(v) if v > 0 => panic!(),
+ Ok(v) | Err(v) => v,
+ };
+
+ // The diverging arm creates a binding
+ let v = match f() {
+ Ok(v) => v,
+ Err(e) => panic!("error: {e}"),
+ };
+
+ // Custom enum where the diverging arm
+ // explicitly mentions the variant
+ let v = match build_enum() {
+ Variant::Foo => return,
+ Variant::Bar(v) | Variant::Baz(v) => v,
+ };
+
+ // The custom enum is surrounded by an Err()
+ let v = match Err(build_enum()) {
+ Ok(v) | Err(Variant::Bar(v) | Variant::Baz(v)) => v,
+ Err(Variant::Foo) => return,
+ };
+}
--- /dev/null
- | |__________^ help: consider writing: `let (Some(v), None) | (None, Some(v)) = h() else { continue };`
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:32:5
+ |
+LL | / let v = match g() {
+LL | | Some(v_some) => v_some,
+LL | | None => return,
+LL | | };
+ | |______^ help: consider writing: `let Some(v_some) = g() else { return };`
+ |
+ = note: `-D clippy::manual-let-else` implied by `-D warnings`
+
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:37:5
+ |
+LL | / let v = match g() {
+LL | | Some(v_some) => v_some,
+LL | | _ => return,
+LL | | };
+ | |______^ help: consider writing: `let Some(v_some) = g() else { return };`
+
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:44:9
+ |
+LL | / let v = match h() {
+LL | | (Some(_), Some(_)) | (None, None) => continue,
+LL | | (Some(v), None) | (None, Some(v)) => v,
+LL | | };
- | |__________^ help: consider writing: `let Variant::Bar(v) | Variant::Baz(v) = build_enum() else { continue };`
++ | |__________^ help: consider writing: `let ((Some(v), None) | (None, Some(v))) = h() else { continue };`
+
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:49:9
+ |
+LL | / let v = match build_enum() {
+LL | | _ => continue,
+LL | | Variant::Bar(v) | Variant::Baz(v) => v,
+LL | | };
- error: aborting due to 6 previous errors
++ | |__________^ help: consider writing: `let (Variant::Bar(v) | Variant::Baz(v)) = build_enum() else { continue };`
+
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:57:5
+ |
+LL | / let v = match f() {
+LL | | Ok(v) => v,
+LL | | Err(_) => return,
+LL | | };
+ | |______^ help: consider writing: `let Ok(v) = f() else { return };`
+
+error: this could be rewritten as `let...else`
+ --> $DIR/manual_let_else_match.rs:63:5
+ |
+LL | / let v = match f().map_err(|_| ()) {
+LL | | Ok(v) => v,
+LL | | Err(()) => return,
+LL | | };
+ | |______^ help: consider writing: `let Ok(v) = f().map_err(|_| ()) else { return };`
+
++error: this could be rewritten as `let...else`
++ --> $DIR/manual_let_else_match.rs:70:5
++ |
++LL | / let _value = match f {
++LL | | Variant::Bar(_) | Variant::Baz(_) => (),
++LL | | _ => return,
++LL | | };
++ | |______^ help: consider writing: `let (Variant::Bar(_) | Variant::Baz(_)) = f else { return };`
++
++error: aborting due to 7 previous errors
+
--- /dev/null
- #![allow(clippy::almost_complete_letter_range)]
+// run-rustfix
+// edition:2018
+
+#![warn(clippy::needless_parens_on_range_literals)]
++#![allow(clippy::almost_complete_range)]
+
+fn main() {
+ let _ = 'a'..='z';
+ let _ = 'a'..'z';
+ let _ = (1.)..2.;
+ let _ = (1.)..2.;
+ let _ = 'a'..;
+ let _ = ..'z';
+}
--- /dev/null
- #![allow(clippy::almost_complete_letter_range)]
+// run-rustfix
+// edition:2018
+
+#![warn(clippy::needless_parens_on_range_literals)]
++#![allow(clippy::almost_complete_range)]
+
+fn main() {
+ let _ = ('a')..=('z');
+ let _ = 'a'..('z');
+ let _ = (1.)..2.;
+ let _ = (1.)..(2.);
+ let _ = ('a')..;
+ let _ = ..('z');
+}
--- /dev/null
++#![feature(type_alias_impl_trait)]
+#![warn(clippy::new_ret_no_self)]
+#![allow(dead_code)]
+
+fn main() {}
+
+trait R {
+ type Item;
+}
+
+trait Q {
+ type Item;
+ type Item2;
+}
+
+struct S;
+
+impl R for S {
+ type Item = Self;
+}
+
+impl S {
+ // should not trigger the lint
+ pub fn new() -> impl R<Item = Self> {
+ S
+ }
+}
+
+struct S2;
+
+impl R for S2 {
+ type Item = Self;
+}
+
+impl S2 {
+ // should not trigger the lint
+ pub fn new(_: String) -> impl R<Item = Self> {
+ S2
+ }
+}
+
+struct S3;
+
+impl R for S3 {
+ type Item = u32;
+}
+
+impl S3 {
+ // should trigger the lint
+ pub fn new(_: String) -> impl R<Item = u32> {
+ S3
+ }
+}
+
+struct S4;
+
+impl Q for S4 {
+ type Item = u32;
+ type Item2 = Self;
+}
+
+impl S4 {
+ // should not trigger the lint
+ pub fn new(_: String) -> impl Q<Item = u32, Item2 = Self> {
+ S4
+ }
+}
+
+struct T;
+
+impl T {
+ // should not trigger lint
+ pub fn new() -> Self {
+ unimplemented!();
+ }
+}
+
+struct U;
+
+impl U {
+ // should trigger lint
+ pub fn new() -> u32 {
+ unimplemented!();
+ }
+}
+
+struct V;
+
+impl V {
+ // should trigger lint
+ pub fn new(_: String) -> u32 {
+ unimplemented!();
+ }
+}
+
+struct TupleReturnerOk;
+
+impl TupleReturnerOk {
+ // should not trigger lint
+ pub fn new() -> (Self, u32) {
+ unimplemented!();
+ }
+}
+
+struct TupleReturnerOk2;
+
+impl TupleReturnerOk2 {
+ // should not trigger lint (it doesn't matter which element in the tuple is Self)
+ pub fn new() -> (u32, Self) {
+ unimplemented!();
+ }
+}
+
+struct TupleReturnerOk3;
+
+impl TupleReturnerOk3 {
+ // should not trigger lint (tuple can contain multiple Self)
+ pub fn new() -> (Self, Self) {
+ unimplemented!();
+ }
+}
+
+struct TupleReturnerBad;
+
+impl TupleReturnerBad {
+ // should trigger lint
+ pub fn new() -> (u32, u32) {
+ unimplemented!();
+ }
+}
+
+struct MutPointerReturnerOk;
+
+impl MutPointerReturnerOk {
+ // should not trigger lint
+ pub fn new() -> *mut Self {
+ unimplemented!();
+ }
+}
+
+struct ConstPointerReturnerOk2;
+
+impl ConstPointerReturnerOk2 {
+ // should not trigger lint
+ pub fn new() -> *const Self {
+ unimplemented!();
+ }
+}
+
+struct MutPointerReturnerBad;
+
+impl MutPointerReturnerBad {
+ // should trigger lint
+ pub fn new() -> *mut V {
+ unimplemented!();
+ }
+}
+
+struct GenericReturnerOk;
+
+impl GenericReturnerOk {
+ // should not trigger lint
+ pub fn new() -> Option<Self> {
+ unimplemented!();
+ }
+}
+
+struct GenericReturnerBad;
+
+impl GenericReturnerBad {
+ // should trigger lint
+ pub fn new() -> Option<u32> {
+ unimplemented!();
+ }
+}
+
+struct NestedReturnerOk;
+
+impl NestedReturnerOk {
+ // should not trigger lint
+ pub fn new() -> (Option<Self>, u32) {
+ unimplemented!();
+ }
+}
+
+struct NestedReturnerOk2;
+
+impl NestedReturnerOk2 {
+ // should not trigger lint
+ pub fn new() -> ((Self, u32), u32) {
+ unimplemented!();
+ }
+}
+
+struct NestedReturnerOk3;
+
+impl NestedReturnerOk3 {
+ // should not trigger lint
+ pub fn new() -> Option<(Self, u32)> {
+ unimplemented!();
+ }
+}
+
+struct WithLifetime<'a> {
+ cat: &'a str,
+}
+
+impl<'a> WithLifetime<'a> {
+ // should not trigger the lint, because the lifetimes are different
+ pub fn new<'b: 'a>(s: &'b str) -> WithLifetime<'b> {
+ unimplemented!();
+ }
+}
+
+mod issue5435 {
+ struct V;
+
+ pub trait TraitRetSelf {
+ // should not trigger lint
+ fn new() -> Self;
+ }
+
+ pub trait TraitRet {
+ // should trigger lint as we are in trait definition
+ fn new() -> String;
+ }
+ pub struct StructRet;
+ impl TraitRet for StructRet {
+ // should not trigger lint as we are in the impl block
+ fn new() -> String {
+ unimplemented!();
+ }
+ }
+
+ pub trait TraitRet2 {
+ // should trigger lint
+ fn new(_: String) -> String;
+ }
+
+ trait TupleReturnerOk {
+ // should not trigger lint
+ fn new() -> (Self, u32)
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait TupleReturnerOk2 {
+ // should not trigger lint (it doesn't matter which element in the tuple is Self)
+ fn new() -> (u32, Self)
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait TupleReturnerOk3 {
+ // should not trigger lint (tuple can contain multiple Self)
+ fn new() -> (Self, Self)
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait TupleReturnerBad {
+ // should trigger lint
+ fn new() -> (u32, u32) {
+ unimplemented!();
+ }
+ }
+
+ trait MutPointerReturnerOk {
+ // should not trigger lint
+ fn new() -> *mut Self
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait ConstPointerReturnerOk2 {
+ // should not trigger lint
+ fn new() -> *const Self
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait MutPointerReturnerBad {
+ // should trigger lint
+ fn new() -> *mut V {
+ unimplemented!();
+ }
+ }
+
+ trait GenericReturnerOk {
+ // should not trigger lint
+ fn new() -> Option<Self>
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait NestedReturnerOk {
+ // should not trigger lint
+ fn new() -> (Option<Self>, u32)
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait NestedReturnerOk2 {
+ // should not trigger lint
+ fn new() -> ((Self, u32), u32)
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+
+ trait NestedReturnerOk3 {
+ // should not trigger lint
+ fn new() -> Option<(Self, u32)>
+ where
+ Self: Sized,
+ {
+ unimplemented!();
+ }
+ }
+}
+
+// issue #1724
+struct RetOtherSelf<T>(T);
+struct RetOtherSelfWrapper<T>(T);
+
+impl RetOtherSelf<T> {
+ fn new(t: T) -> RetOtherSelf<RetOtherSelfWrapper<T>> {
+ RetOtherSelf(RetOtherSelfWrapper(t))
+ }
+}
+
+mod issue7344 {
+ struct RetImplTraitSelf<T>(T);
+
+ impl<T> RetImplTraitSelf<T> {
+ // should not trigger lint
+ fn new(t: T) -> impl Into<Self> {
+ Self(t)
+ }
+ }
+
+ struct RetImplTraitNoSelf<T>(T);
+
+ impl<T> RetImplTraitNoSelf<T> {
+ // should trigger lint
+ fn new(t: T) -> impl Into<i32> {
+ 1
+ }
+ }
+
+ trait Trait2<T, U> {}
+ impl<T, U> Trait2<T, U> for () {}
+
+ struct RetImplTraitSelf2<T>(T);
+
+ impl<T> RetImplTraitSelf2<T> {
+ // should not trigger lint
+ fn new(t: T) -> impl Trait2<(), Self> {
+ unimplemented!()
+ }
+ }
+
+ struct RetImplTraitNoSelf2<T>(T);
+
+ impl<T> RetImplTraitNoSelf2<T> {
+ // should trigger lint
+ fn new(t: T) -> impl Trait2<(), i32> {
+ unimplemented!()
+ }
+ }
+
+ struct RetImplTraitSelfAdt<'a>(&'a str);
+
+ impl<'a> RetImplTraitSelfAdt<'a> {
+ // should not trigger lint
+ fn new<'b: 'a>(s: &'b str) -> impl Into<RetImplTraitSelfAdt<'b>> {
+ RetImplTraitSelfAdt(s)
+ }
+ }
+}
++
++mod issue10041 {
++ struct Bomb;
++
++ impl Bomb {
++ // Hidden <Rhs = Self> default generic paramter.
++ pub fn new() -> impl PartialOrd {
++ 0i32
++ }
++ }
++
++ // TAIT with self-referencing bounds
++ type X = impl std::ops::Add<Output = X>;
++
++ struct Bomb2;
++
++ impl Bomb2 {
++ pub fn new() -> X {
++ 0i32
++ }
++ }
++}
--- /dev/null
- --> $DIR/new_ret_no_self.rs:49:5
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:81:5
++ --> $DIR/new_ret_no_self.rs:50:5
+ |
+LL | / pub fn new(_: String) -> impl R<Item = u32> {
+LL | | S3
+LL | | }
+ | |_____^
+ |
+ = note: `-D clippy::new-ret-no-self` implied by `-D warnings`
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:90:5
++ --> $DIR/new_ret_no_self.rs:82:5
+ |
+LL | / pub fn new() -> u32 {
+LL | | unimplemented!();
+LL | | }
+ | |_____^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:126:5
++ --> $DIR/new_ret_no_self.rs:91:5
+ |
+LL | / pub fn new(_: String) -> u32 {
+LL | | unimplemented!();
+LL | | }
+ | |_____^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:153:5
++ --> $DIR/new_ret_no_self.rs:127:5
+ |
+LL | / pub fn new() -> (u32, u32) {
+LL | | unimplemented!();
+LL | | }
+ | |_____^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:171:5
++ --> $DIR/new_ret_no_self.rs:154:5
+ |
+LL | / pub fn new() -> *mut V {
+LL | | unimplemented!();
+LL | | }
+ | |_____^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:224:9
++ --> $DIR/new_ret_no_self.rs:172:5
+ |
+LL | / pub fn new() -> Option<u32> {
+LL | | unimplemented!();
+LL | | }
+ | |_____^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:236:9
++ --> $DIR/new_ret_no_self.rs:225:9
+ |
+LL | fn new() -> String;
+ | ^^^^^^^^^^^^^^^^^^^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:271:9
++ --> $DIR/new_ret_no_self.rs:237:9
+ |
+LL | fn new(_: String) -> String;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:298:9
++ --> $DIR/new_ret_no_self.rs:272:9
+ |
+LL | / fn new() -> (u32, u32) {
+LL | | unimplemented!();
+LL | | }
+ | |_________^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:368:9
++ --> $DIR/new_ret_no_self.rs:299:9
+ |
+LL | / fn new() -> *mut V {
+LL | | unimplemented!();
+LL | | }
+ | |_________^
+
+error: methods called `new` usually return `Self`
- --> $DIR/new_ret_no_self.rs:389:9
++ --> $DIR/new_ret_no_self.rs:369:9
+ |
+LL | / fn new(t: T) -> impl Into<i32> {
+LL | | 1
+LL | | }
+ | |_________^
+
+error: methods called `new` usually return `Self`
- error: aborting due to 12 previous errors
++ --> $DIR/new_ret_no_self.rs:390:9
+ |
+LL | / fn new(t: T) -> impl Trait2<(), i32> {
+LL | | unimplemented!()
+LL | | }
+ | |_________^
+
++error: methods called `new` usually return `Self`
++ --> $DIR/new_ret_no_self.rs:410:9
++ |
++LL | / pub fn new() -> impl PartialOrd {
++LL | | 0i32
++LL | | }
++ | |_________^
++
++error: methods called `new` usually return `Self`
++ --> $DIR/new_ret_no_self.rs:421:9
++ |
++LL | / pub fn new() -> X {
++LL | | 0i32
++LL | | }
++ | |_________^
++
++error: aborting due to 14 previous errors
+
--- /dev/null
+// run-rustfix
+
+#![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.
+
++static mut STATIC_MUT_SLICE: &mut [u32] = &mut [0];
++
+fn main() {
+ let false_positive: &'static str = "test";
++
++ unsafe {
++ STATIC_MUT_SLICE[0] = 0;
++ }
+}
+
+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";
+}
+
+#[clippy::msrv = "1.16"]
+fn msrv_1_16() {
+ static V: &'static u8 = &16;
+}
+
+#[clippy::msrv = "1.17"]
+fn msrv_1_17() {
+ static V: &u8 = &17;
+}
--- /dev/null
+// run-rustfix
+
+#![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.
+
++static mut STATIC_MUT_SLICE: &'static mut [u32] = &mut [0];
++
+fn main() {
+ let false_positive: &'static str = "test";
++
++ unsafe {
++ STATIC_MUT_SLICE[0] = 0;
++ }
+}
+
+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";
+}
+
+#[clippy::msrv = "1.16"]
+fn msrv_1_16() {
+ static V: &'static u8 = &16;
+}
+
+#[clippy::msrv = "1.17"]
+fn msrv_1_17() {
+ static V: &'static u8 = &17;
+}
--- /dev/null
- --> $DIR/redundant_static_lifetimes.rs:65:16
+error: constants have by default a `'static` lifetime
+ --> $DIR/redundant_static_lifetimes.rs:8:17
+ |
+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:12:21
+ |
+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:14:32
+ |
+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:14:47
+ |
+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:16:17
+ |
+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:18:20
+ |
+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:20:19
+ |
+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:22:19
+ |
+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:24:19
+ |
+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:26:25
+ |
+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:30:29
+ |
+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:32:25
+ |
+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:34:28
+ |
+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:36:27
+ |
+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:38:27
+ |
+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
+ --> $DIR/redundant_static_lifetimes.rs:40:27
+ |
+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
- error: aborting due to 17 previous errors
++ --> $DIR/redundant_static_lifetimes.rs:42:31
++ |
++LL | static mut STATIC_MUT_SLICE: &'static mut [u32] = &mut [0];
++ | -^^^^^^^---------- help: consider removing `'static`: `&mut [u32]`
++
++error: statics have by default a `'static` lifetime
++ --> $DIR/redundant_static_lifetimes.rs:71:16
+ |
+LL | static V: &'static u8 = &17;
+ | -^^^^^^^--- help: consider removing `'static`: `&u8`
+
++error: aborting due to 18 previous errors
+
--- /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.
+
+// run-rustfix
+
++#![allow(clippy::almost_complete_range)]
+#![allow(clippy::disallowed_names)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::disallowed_methods)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::mixed_read_write_in_expression)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::match_result_ok)]
+#![allow(clippy::overly_complex_bool_expr)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::needless_borrow)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::recursive_format_impl)]
+#![allow(clippy::invisible_characters)]
+#![allow(drop_bounds)]
+#![allow(for_loops_over_fallibles)]
+#![allow(array_into_iter)]
+#![allow(invalid_atomic_ordering)]
+#![allow(invalid_value)]
+#![allow(let_underscore_drop)]
+#![allow(enum_intrinsics_non_enums)]
+#![allow(non_fmt_panics)]
+#![allow(named_arguments_used_positionally)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(unknown_lints)]
+#![allow(unused_labels)]
++#![warn(clippy::almost_complete_range)]
+#![warn(clippy::disallowed_names)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::box_collection)]
+#![warn(clippy::redundant_static_lifetimes)]
+#![warn(clippy::cognitive_complexity)]
+#![warn(clippy::disallowed_methods)]
+#![warn(clippy::disallowed_types)]
+#![warn(clippy::mixed_read_write_in_expression)]
+#![warn(clippy::useless_conversion)]
+#![warn(clippy::match_result_ok)]
+#![warn(clippy::overly_complex_bool_expr)]
+#![warn(clippy::new_without_default)]
+#![warn(clippy::bind_instead_of_map)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::needless_borrow)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::single_char_add_str)]
+#![warn(clippy::module_name_repetitions)]
+#![warn(clippy::recursive_format_impl)]
+#![warn(clippy::invisible_characters)]
+#![warn(drop_bounds)]
+#![warn(for_loops_over_fallibles)]
+#![warn(for_loops_over_fallibles)]
+#![warn(for_loops_over_fallibles)]
+#![warn(array_into_iter)]
+#![warn(invalid_atomic_ordering)]
+#![warn(invalid_value)]
+#![warn(let_underscore_drop)]
+#![warn(enum_intrinsics_non_enums)]
+#![warn(non_fmt_panics)]
+#![warn(named_arguments_used_positionally)]
+#![warn(temporary_cstring_as_ptr)]
+#![warn(unknown_lints)]
+#![warn(unused_labels)]
+
+fn main() {}
--- /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.
+
+// run-rustfix
+
++#![allow(clippy::almost_complete_range)]
+#![allow(clippy::disallowed_names)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::disallowed_methods)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::mixed_read_write_in_expression)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::match_result_ok)]
+#![allow(clippy::overly_complex_bool_expr)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::needless_borrow)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::recursive_format_impl)]
+#![allow(clippy::invisible_characters)]
+#![allow(drop_bounds)]
+#![allow(for_loops_over_fallibles)]
+#![allow(array_into_iter)]
+#![allow(invalid_atomic_ordering)]
+#![allow(invalid_value)]
+#![allow(let_underscore_drop)]
+#![allow(enum_intrinsics_non_enums)]
+#![allow(non_fmt_panics)]
+#![allow(named_arguments_used_positionally)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(unknown_lints)]
+#![allow(unused_labels)]
++#![warn(clippy::almost_complete_letter_range)]
+#![warn(clippy::blacklisted_name)]
+#![warn(clippy::block_in_if_condition_expr)]
+#![warn(clippy::block_in_if_condition_stmt)]
+#![warn(clippy::box_vec)]
+#![warn(clippy::const_static_lifetime)]
+#![warn(clippy::cyclomatic_complexity)]
+#![warn(clippy::disallowed_method)]
+#![warn(clippy::disallowed_type)]
+#![warn(clippy::eval_order_dependence)]
+#![warn(clippy::identity_conversion)]
+#![warn(clippy::if_let_some_result)]
+#![warn(clippy::logic_bug)]
+#![warn(clippy::new_without_default_derive)]
+#![warn(clippy::option_and_then_some)]
+#![warn(clippy::option_expect_used)]
+#![warn(clippy::option_map_unwrap_or)]
+#![warn(clippy::option_map_unwrap_or_else)]
+#![warn(clippy::option_unwrap_used)]
+#![warn(clippy::ref_in_deref)]
+#![warn(clippy::result_expect_used)]
+#![warn(clippy::result_map_unwrap_or_else)]
+#![warn(clippy::result_unwrap_used)]
+#![warn(clippy::single_char_push_str)]
+#![warn(clippy::stutter)]
+#![warn(clippy::to_string_in_display)]
+#![warn(clippy::zero_width_space)]
+#![warn(clippy::drop_bounds)]
+#![warn(clippy::for_loop_over_option)]
+#![warn(clippy::for_loop_over_result)]
+#![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::into_iter_on_array)]
+#![warn(clippy::invalid_atomic_ordering)]
+#![warn(clippy::invalid_ref)]
+#![warn(clippy::let_underscore_drop)]
+#![warn(clippy::mem_discriminant_non_enum)]
+#![warn(clippy::panic_params)]
+#![warn(clippy::positional_named_format_parameters)]
+#![warn(clippy::temporary_cstring_as_ptr)]
+#![warn(clippy::unknown_clippy_lints)]
+#![warn(clippy::unused_label)]
+
+fn main() {}
--- /dev/null
- --> $DIR/rename.rs:40:9
++error: lint `clippy::almost_complete_letter_range` has been renamed to `clippy::almost_complete_range`
++ --> $DIR/rename.rs:41:9
++ |
++LL | #![warn(clippy::almost_complete_letter_range)]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::almost_complete_range`
++ |
++ = note: `-D renamed-and-removed-lints` implied by `-D warnings`
++
+error: lint `clippy::blacklisted_name` has been renamed to `clippy::disallowed_names`
- |
- = note: `-D renamed-and-removed-lints` implied by `-D warnings`
++ --> $DIR/rename.rs:42:9
+ |
+LL | #![warn(clippy::blacklisted_name)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_names`
- --> $DIR/rename.rs:41:9
+
+error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_if_conditions`
- --> $DIR/rename.rs:42:9
++ --> $DIR/rename.rs:43:9
+ |
+LL | #![warn(clippy::block_in_if_condition_expr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
+
+error: lint `clippy::block_in_if_condition_stmt` has been renamed to `clippy::blocks_in_if_conditions`
- --> $DIR/rename.rs:43:9
++ --> $DIR/rename.rs:44:9
+ |
+LL | #![warn(clippy::block_in_if_condition_stmt)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
+
+error: lint `clippy::box_vec` has been renamed to `clippy::box_collection`
- --> $DIR/rename.rs:44:9
++ --> $DIR/rename.rs:45:9
+ |
+LL | #![warn(clippy::box_vec)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::box_collection`
+
+error: lint `clippy::const_static_lifetime` has been renamed to `clippy::redundant_static_lifetimes`
- --> $DIR/rename.rs:45:9
++ --> $DIR/rename.rs:46:9
+ |
+LL | #![warn(clippy::const_static_lifetime)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::redundant_static_lifetimes`
+
+error: lint `clippy::cyclomatic_complexity` has been renamed to `clippy::cognitive_complexity`
- --> $DIR/rename.rs:46:9
++ --> $DIR/rename.rs:47:9
+ |
+LL | #![warn(clippy::cyclomatic_complexity)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
+
+error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
- --> $DIR/rename.rs:47:9
++ --> $DIR/rename.rs:48:9
+ |
+LL | #![warn(clippy::disallowed_method)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
+
+error: lint `clippy::disallowed_type` has been renamed to `clippy::disallowed_types`
- --> $DIR/rename.rs:48:9
++ --> $DIR/rename.rs:49:9
+ |
+LL | #![warn(clippy::disallowed_type)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_types`
+
+error: lint `clippy::eval_order_dependence` has been renamed to `clippy::mixed_read_write_in_expression`
- --> $DIR/rename.rs:49:9
++ --> $DIR/rename.rs:50:9
+ |
+LL | #![warn(clippy::eval_order_dependence)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::mixed_read_write_in_expression`
+
+error: lint `clippy::identity_conversion` has been renamed to `clippy::useless_conversion`
- --> $DIR/rename.rs:50:9
++ --> $DIR/rename.rs:51:9
+ |
+LL | #![warn(clippy::identity_conversion)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::useless_conversion`
+
+error: lint `clippy::if_let_some_result` has been renamed to `clippy::match_result_ok`
- --> $DIR/rename.rs:51:9
++ --> $DIR/rename.rs:52:9
+ |
+LL | #![warn(clippy::if_let_some_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::match_result_ok`
+
+error: lint `clippy::logic_bug` has been renamed to `clippy::overly_complex_bool_expr`
- --> $DIR/rename.rs:52:9
++ --> $DIR/rename.rs:53:9
+ |
+LL | #![warn(clippy::logic_bug)]
+ | ^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::overly_complex_bool_expr`
+
+error: lint `clippy::new_without_default_derive` has been renamed to `clippy::new_without_default`
- --> $DIR/rename.rs:53:9
++ --> $DIR/rename.rs:54:9
+ |
+LL | #![warn(clippy::new_without_default_derive)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::new_without_default`
+
+error: lint `clippy::option_and_then_some` has been renamed to `clippy::bind_instead_of_map`
- --> $DIR/rename.rs:54:9
++ --> $DIR/rename.rs:55:9
+ |
+LL | #![warn(clippy::option_and_then_some)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::bind_instead_of_map`
+
+error: lint `clippy::option_expect_used` has been renamed to `clippy::expect_used`
- --> $DIR/rename.rs:55:9
++ --> $DIR/rename.rs:56:9
+ |
+LL | #![warn(clippy::option_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::option_map_unwrap_or` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:56:9
++ --> $DIR/rename.rs:57:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:57:9
++ --> $DIR/rename.rs:58:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_unwrap_used` has been renamed to `clippy::unwrap_used`
- --> $DIR/rename.rs:58:9
++ --> $DIR/rename.rs:59:9
+ |
+LL | #![warn(clippy::option_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
- --> $DIR/rename.rs:59:9
++ --> $DIR/rename.rs:60:9
+ |
+LL | #![warn(clippy::ref_in_deref)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
+
+error: lint `clippy::result_expect_used` has been renamed to `clippy::expect_used`
- --> $DIR/rename.rs:60:9
++ --> $DIR/rename.rs:61:9
+ |
+LL | #![warn(clippy::result_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::result_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:61:9
++ --> $DIR/rename.rs:62:9
+ |
+LL | #![warn(clippy::result_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::result_unwrap_used` has been renamed to `clippy::unwrap_used`
- --> $DIR/rename.rs:62:9
++ --> $DIR/rename.rs:63:9
+ |
+LL | #![warn(clippy::result_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::single_char_push_str` has been renamed to `clippy::single_char_add_str`
- --> $DIR/rename.rs:63:9
++ --> $DIR/rename.rs:64:9
+ |
+LL | #![warn(clippy::single_char_push_str)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::single_char_add_str`
+
+error: lint `clippy::stutter` has been renamed to `clippy::module_name_repetitions`
- --> $DIR/rename.rs:64:9
++ --> $DIR/rename.rs:65:9
+ |
+LL | #![warn(clippy::stutter)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::module_name_repetitions`
+
+error: lint `clippy::to_string_in_display` has been renamed to `clippy::recursive_format_impl`
- --> $DIR/rename.rs:65:9
++ --> $DIR/rename.rs:66:9
+ |
+LL | #![warn(clippy::to_string_in_display)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::recursive_format_impl`
+
+error: lint `clippy::zero_width_space` has been renamed to `clippy::invisible_characters`
- --> $DIR/rename.rs:66:9
++ --> $DIR/rename.rs:67:9
+ |
+LL | #![warn(clippy::zero_width_space)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::invisible_characters`
+
+error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
- --> $DIR/rename.rs:67:9
++ --> $DIR/rename.rs:68:9
+ |
+LL | #![warn(clippy::drop_bounds)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
+
+error: lint `clippy::for_loop_over_option` has been renamed to `for_loops_over_fallibles`
- --> $DIR/rename.rs:68:9
++ --> $DIR/rename.rs:69:9
+ |
+LL | #![warn(clippy::for_loop_over_option)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
+
+error: lint `clippy::for_loop_over_result` has been renamed to `for_loops_over_fallibles`
- --> $DIR/rename.rs:69:9
++ --> $DIR/rename.rs:70:9
+ |
+LL | #![warn(clippy::for_loop_over_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
+
+error: lint `clippy::for_loops_over_fallibles` has been renamed to `for_loops_over_fallibles`
- --> $DIR/rename.rs:70:9
++ --> $DIR/rename.rs:71:9
+ |
+LL | #![warn(clippy::for_loops_over_fallibles)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `for_loops_over_fallibles`
+
+error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
- --> $DIR/rename.rs:71:9
++ --> $DIR/rename.rs:72:9
+ |
+LL | #![warn(clippy::into_iter_on_array)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
+
+error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
- --> $DIR/rename.rs:72:9
++ --> $DIR/rename.rs:73:9
+ |
+LL | #![warn(clippy::invalid_atomic_ordering)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
+
+error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
- --> $DIR/rename.rs:73:9
++ --> $DIR/rename.rs:74:9
+ |
+LL | #![warn(clippy::invalid_ref)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
+
+error: lint `clippy::let_underscore_drop` has been renamed to `let_underscore_drop`
- --> $DIR/rename.rs:74:9
++ --> $DIR/rename.rs:75:9
+ |
+LL | #![warn(clippy::let_underscore_drop)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `let_underscore_drop`
+
+error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
- --> $DIR/rename.rs:75:9
++ --> $DIR/rename.rs:76:9
+ |
+LL | #![warn(clippy::mem_discriminant_non_enum)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
+
+error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
- --> $DIR/rename.rs:76:9
++ --> $DIR/rename.rs:77:9
+ |
+LL | #![warn(clippy::panic_params)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
+
+error: lint `clippy::positional_named_format_parameters` has been renamed to `named_arguments_used_positionally`
- --> $DIR/rename.rs:77:9
++ --> $DIR/rename.rs:78:9
+ |
+LL | #![warn(clippy::positional_named_format_parameters)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `named_arguments_used_positionally`
+
+error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
- --> $DIR/rename.rs:78:9
++ --> $DIR/rename.rs:79:9
+ |
+LL | #![warn(clippy::temporary_cstring_as_ptr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
+
+error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
- --> $DIR/rename.rs:79:9
++ --> $DIR/rename.rs:80:9
+ |
+LL | #![warn(clippy::unknown_clippy_lints)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
+
+error: lint `clippy::unused_label` has been renamed to `unused_labels`
- error: aborting due to 40 previous errors
++ --> $DIR/rename.rs:81:9
+ |
+LL | #![warn(clippy::unused_label)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
+
++error: aborting due to 41 previous errors
+
--- /dev/null
+// run-rustfix
+#![allow(unused)]
+#![warn(clippy::seek_to_start_instead_of_rewind)]
+
+use std::fs::OpenOptions;
+use std::io::{Read, Seek, SeekFrom, Write};
+
+struct StructWithSeekMethod {}
+
+impl StructWithSeekMethod {
+ fn seek(&mut self, from: SeekFrom) {}
+}
+
+trait MySeekTrait {
+ fn seek(&mut self, from: SeekFrom) {}
+}
+
+struct StructWithSeekTrait {}
+impl MySeekTrait for StructWithSeekTrait {}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_method(t: &mut StructWithSeekMethod) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_method_owned_false<T>(mut t: StructWithSeekMethod) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait(t: &mut StructWithSeekTrait) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait_owned<T>(mut t: StructWithSeekTrait) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait_bound<T: MySeekTrait>(t: &mut T) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should trigger clippy warning
+fn seek_to_start<T: Seek>(t: &mut T) {
+ t.rewind();
+}
+
+// This should trigger clippy warning
+fn owned_seek_to_start<T: Seek>(mut t: T) {
+ t.rewind();
+}
+
+// This should NOT trigger clippy warning because
+// it does not seek to start
+fn seek_to_5<T: Seek>(t: &mut T) {
+ t.seek(SeekFrom::Start(5));
+}
+
+// This should NOT trigger clippy warning because
+// it does not seek to start
+fn seek_to_end<T: Seek>(t: &mut T) {
+ t.seek(SeekFrom::End(0));
+}
+
++// This should NOT trigger clippy warning because
++// expr is used here
++fn seek_to_start_in_let<T: Seek>(t: &mut T) {
++ let a = t.seek(SeekFrom::Start(0)).unwrap();
++}
++
+fn main() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let mut my_struct_trait = StructWithSeekTrait {};
+ seek_to_start_false_trait_bound(&mut my_struct_trait);
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+ seek_to_5(&mut f);
+ seek_to_end(&mut f);
+ seek_to_start(&mut f);
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
+
+#[clippy::msrv = "1.54"]
+fn msrv_1_54() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+
+ f.seek(SeekFrom::Start(0));
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
+
+#[clippy::msrv = "1.55"]
+fn msrv_1_55() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+
+ f.rewind();
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
--- /dev/null
+// run-rustfix
+#![allow(unused)]
+#![warn(clippy::seek_to_start_instead_of_rewind)]
+
+use std::fs::OpenOptions;
+use std::io::{Read, Seek, SeekFrom, Write};
+
+struct StructWithSeekMethod {}
+
+impl StructWithSeekMethod {
+ fn seek(&mut self, from: SeekFrom) {}
+}
+
+trait MySeekTrait {
+ fn seek(&mut self, from: SeekFrom) {}
+}
+
+struct StructWithSeekTrait {}
+impl MySeekTrait for StructWithSeekTrait {}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_method(t: &mut StructWithSeekMethod) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_method_owned_false<T>(mut t: StructWithSeekMethod) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait(t: &mut StructWithSeekTrait) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait_owned<T>(mut t: StructWithSeekTrait) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// StructWithSeekMethod does not implement std::io::Seek;
+fn seek_to_start_false_trait_bound<T: MySeekTrait>(t: &mut T) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should trigger clippy warning
+fn seek_to_start<T: Seek>(t: &mut T) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should trigger clippy warning
+fn owned_seek_to_start<T: Seek>(mut t: T) {
+ t.seek(SeekFrom::Start(0));
+}
+
+// This should NOT trigger clippy warning because
+// it does not seek to start
+fn seek_to_5<T: Seek>(t: &mut T) {
+ t.seek(SeekFrom::Start(5));
+}
+
+// This should NOT trigger clippy warning because
+// it does not seek to start
+fn seek_to_end<T: Seek>(t: &mut T) {
+ t.seek(SeekFrom::End(0));
+}
+
++// This should NOT trigger clippy warning because
++// expr is used here
++fn seek_to_start_in_let<T: Seek>(t: &mut T) {
++ let a = t.seek(SeekFrom::Start(0)).unwrap();
++}
++
+fn main() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let mut my_struct_trait = StructWithSeekTrait {};
+ seek_to_start_false_trait_bound(&mut my_struct_trait);
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+ seek_to_5(&mut f);
+ seek_to_end(&mut f);
+ seek_to_start(&mut f);
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
+
+#[clippy::msrv = "1.54"]
+fn msrv_1_54() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+
+ f.seek(SeekFrom::Start(0));
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
+
+#[clippy::msrv = "1.55"]
+fn msrv_1_55() {
+ let mut f = OpenOptions::new()
+ .write(true)
+ .read(true)
+ .create(true)
+ .open("foo.txt")
+ .unwrap();
+
+ let hello = "Hello!\n";
+ write!(f, "{hello}").unwrap();
+
+ f.seek(SeekFrom::Start(0));
+
+ let mut buf = String::new();
+ f.read_to_string(&mut buf).unwrap();
+
+ assert_eq!(&buf, hello);
+}
--- /dev/null
- --> $DIR/seek_to_start_instead_of_rewind.rs:128:7
+error: used `seek` to go to the start of the stream
+ --> $DIR/seek_to_start_instead_of_rewind.rs:53:7
+ |
+LL | t.seek(SeekFrom::Start(0));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `rewind()`
+ |
+ = note: `-D clippy::seek-to-start-instead-of-rewind` implied by `-D warnings`
+
+error: used `seek` to go to the start of the stream
+ --> $DIR/seek_to_start_instead_of_rewind.rs:58:7
+ |
+LL | t.seek(SeekFrom::Start(0));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `rewind()`
+
+error: used `seek` to go to the start of the stream
++ --> $DIR/seek_to_start_instead_of_rewind.rs:134:7
+ |
+LL | f.seek(SeekFrom::Start(0));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `rewind()`
+
+error: aborting due to 3 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++#![allow(
++ unused,
++ clippy::unused_unit,
++ clippy::unnecessary_operation,
++ clippy::no_effect,
++ clippy::single_element_loop
++)]
++#![warn(clippy::semicolon_inside_block)]
++
++macro_rules! m {
++ (()) => {
++ ()
++ };
++ (0) => {{
++ 0
++ };};
++ (1) => {{
++ 1;
++ }};
++ (2) => {{
++ 2;
++ }};
++}
++
++fn unit_fn_block() {
++ ()
++}
++
++#[rustfmt::skip]
++fn main() {
++ { unit_fn_block() }
++ unsafe { unit_fn_block() }
++
++ {
++ unit_fn_block()
++ }
++
++ { unit_fn_block(); }
++ unsafe { unit_fn_block(); }
++
++ { unit_fn_block(); }
++ unsafe { unit_fn_block(); }
++
++ { unit_fn_block(); };
++ unsafe { unit_fn_block(); };
++
++ {
++ unit_fn_block();
++ unit_fn_block();
++ }
++ {
++ unit_fn_block();
++ unit_fn_block();
++ }
++ {
++ unit_fn_block();
++ unit_fn_block();
++ };
++
++ { m!(()); }
++ { m!(()); }
++ { m!(()); };
++ m!(0);
++ m!(1);
++ m!(2);
++
++ for _ in [()] {
++ unit_fn_block();
++ }
++ for _ in [()] {
++ unit_fn_block()
++ }
++
++ let _d = || {
++ unit_fn_block();
++ };
++ let _d = || {
++ unit_fn_block()
++ };
++
++ { unit_fn_block(); };
++
++ unit_fn_block()
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![allow(
++ unused,
++ clippy::unused_unit,
++ clippy::unnecessary_operation,
++ clippy::no_effect,
++ clippy::single_element_loop
++)]
++#![warn(clippy::semicolon_inside_block)]
++
++macro_rules! m {
++ (()) => {
++ ()
++ };
++ (0) => {{
++ 0
++ };};
++ (1) => {{
++ 1;
++ }};
++ (2) => {{
++ 2;
++ }};
++}
++
++fn unit_fn_block() {
++ ()
++}
++
++#[rustfmt::skip]
++fn main() {
++ { unit_fn_block() }
++ unsafe { unit_fn_block() }
++
++ {
++ unit_fn_block()
++ }
++
++ { unit_fn_block() };
++ unsafe { unit_fn_block() };
++
++ { unit_fn_block(); }
++ unsafe { unit_fn_block(); }
++
++ { unit_fn_block(); };
++ unsafe { unit_fn_block(); };
++
++ {
++ unit_fn_block();
++ unit_fn_block()
++ };
++ {
++ unit_fn_block();
++ unit_fn_block();
++ }
++ {
++ unit_fn_block();
++ unit_fn_block();
++ };
++
++ { m!(()) };
++ { m!(()); }
++ { m!(()); };
++ m!(0);
++ m!(1);
++ m!(2);
++
++ for _ in [()] {
++ unit_fn_block();
++ }
++ for _ in [()] {
++ unit_fn_block()
++ }
++
++ let _d = || {
++ unit_fn_block();
++ };
++ let _d = || {
++ unit_fn_block()
++ };
++
++ { unit_fn_block(); };
++
++ unit_fn_block()
++}
--- /dev/null
--- /dev/null
++error: consider moving the `;` inside the block for consistent formatting
++ --> $DIR/semicolon_inside_block.rs:39:5
++ |
++LL | { unit_fn_block() };
++ | ^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::semicolon-inside-block` implied by `-D warnings`
++help: put the `;` here
++ |
++LL - { unit_fn_block() };
++LL + { unit_fn_block(); }
++ |
++
++error: consider moving the `;` inside the block for consistent formatting
++ --> $DIR/semicolon_inside_block.rs:40:5
++ |
++LL | unsafe { unit_fn_block() };
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: put the `;` here
++ |
++LL - unsafe { unit_fn_block() };
++LL + unsafe { unit_fn_block(); }
++ |
++
++error: consider moving the `;` inside the block for consistent formatting
++ --> $DIR/semicolon_inside_block.rs:48:5
++ |
++LL | / {
++LL | | unit_fn_block();
++LL | | unit_fn_block()
++LL | | };
++ | |______^
++ |
++help: put the `;` here
++ |
++LL ~ unit_fn_block();
++LL ~ }
++ |
++
++error: consider moving the `;` inside the block for consistent formatting
++ --> $DIR/semicolon_inside_block.rs:61:5
++ |
++LL | { m!(()) };
++ | ^^^^^^^^^^^
++ |
++help: put the `;` here
++ |
++LL - { m!(()) };
++LL + { m!(()); }
++ |
++
++error: aborting due to 4 previous errors
++
--- /dev/null
--- /dev/null
++// run-rustfix
++#![allow(
++ unused,
++ clippy::unused_unit,
++ clippy::unnecessary_operation,
++ clippy::no_effect,
++ clippy::single_element_loop
++)]
++#![warn(clippy::semicolon_outside_block)]
++
++macro_rules! m {
++ (()) => {
++ ()
++ };
++ (0) => {{
++ 0
++ };};
++ (1) => {{
++ 1;
++ }};
++ (2) => {{
++ 2;
++ }};
++}
++
++fn unit_fn_block() {
++ ()
++}
++
++#[rustfmt::skip]
++fn main() {
++ { unit_fn_block() }
++ unsafe { unit_fn_block() }
++
++ {
++ unit_fn_block()
++ }
++
++ { unit_fn_block() };
++ unsafe { unit_fn_block() };
++
++ { unit_fn_block() };
++ unsafe { unit_fn_block() };
++
++ { unit_fn_block(); };
++ unsafe { unit_fn_block(); };
++
++ {
++ unit_fn_block();
++ unit_fn_block()
++ };
++ {
++ unit_fn_block();
++ unit_fn_block()
++ };
++ {
++ unit_fn_block();
++ unit_fn_block();
++ };
++
++ { m!(()) };
++ { m!(()) };
++ { m!(()); };
++ m!(0);
++ m!(1);
++ m!(2);
++
++ for _ in [()] {
++ unit_fn_block();
++ }
++ for _ in [()] {
++ unit_fn_block()
++ }
++
++ let _d = || {
++ unit_fn_block();
++ };
++ let _d = || {
++ unit_fn_block()
++ };
++
++ { unit_fn_block(); };
++
++ unit_fn_block()
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![allow(
++ unused,
++ clippy::unused_unit,
++ clippy::unnecessary_operation,
++ clippy::no_effect,
++ clippy::single_element_loop
++)]
++#![warn(clippy::semicolon_outside_block)]
++
++macro_rules! m {
++ (()) => {
++ ()
++ };
++ (0) => {{
++ 0
++ };};
++ (1) => {{
++ 1;
++ }};
++ (2) => {{
++ 2;
++ }};
++}
++
++fn unit_fn_block() {
++ ()
++}
++
++#[rustfmt::skip]
++fn main() {
++ { unit_fn_block() }
++ unsafe { unit_fn_block() }
++
++ {
++ unit_fn_block()
++ }
++
++ { unit_fn_block() };
++ unsafe { unit_fn_block() };
++
++ { unit_fn_block(); }
++ unsafe { unit_fn_block(); }
++
++ { unit_fn_block(); };
++ unsafe { unit_fn_block(); };
++
++ {
++ unit_fn_block();
++ unit_fn_block()
++ };
++ {
++ unit_fn_block();
++ unit_fn_block();
++ }
++ {
++ unit_fn_block();
++ unit_fn_block();
++ };
++
++ { m!(()) };
++ { m!(()); }
++ { m!(()); };
++ m!(0);
++ m!(1);
++ m!(2);
++
++ for _ in [()] {
++ unit_fn_block();
++ }
++ for _ in [()] {
++ unit_fn_block()
++ }
++
++ let _d = || {
++ unit_fn_block();
++ };
++ let _d = || {
++ unit_fn_block()
++ };
++
++ { unit_fn_block(); };
++
++ unit_fn_block()
++}
--- /dev/null
--- /dev/null
++error: consider moving the `;` outside the block for consistent formatting
++ --> $DIR/semicolon_outside_block.rs:42:5
++ |
++LL | { unit_fn_block(); }
++ | ^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::semicolon-outside-block` implied by `-D warnings`
++help: put the `;` here
++ |
++LL - { unit_fn_block(); }
++LL + { unit_fn_block() };
++ |
++
++error: consider moving the `;` outside the block for consistent formatting
++ --> $DIR/semicolon_outside_block.rs:43:5
++ |
++LL | unsafe { unit_fn_block(); }
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: put the `;` here
++ |
++LL - unsafe { unit_fn_block(); }
++LL + unsafe { unit_fn_block() };
++ |
++
++error: consider moving the `;` outside the block for consistent formatting
++ --> $DIR/semicolon_outside_block.rs:52:5
++ |
++LL | / {
++LL | | unit_fn_block();
++LL | | unit_fn_block();
++LL | | }
++ | |_____^
++ |
++help: put the `;` here
++ |
++LL ~ unit_fn_block()
++LL ~ };
++ |
++
++error: consider moving the `;` outside the block for consistent formatting
++ --> $DIR/semicolon_outside_block.rs:62:5
++ |
++LL | { m!(()); }
++ | ^^^^^^^^^^^
++ |
++help: put the `;` here
++ |
++LL - { m!(()); }
++LL + { m!(()) };
++ |
++
++error: aborting due to 4 previous errors
++
--- /dev/null
+// run-rustfix
+
+#![allow(dead_code, unused_variables)]
+#![warn(clippy::string_lit_as_bytes)]
+
+fn str_lit_as_bytes() {
+ let bs = b"hello there";
+
+ let bs = br###"raw string with 3# plus " ""###;
+
+ let bs = b"lit to string".to_vec();
+ let bs = b"lit to owned".to_vec();
+
+ // no warning, because these cannot be written as byte string literals:
+ let ubs = "☃".as_bytes();
+ let ubs = "hello there! this is a very long string".as_bytes();
+
+ let ubs = "☃".to_string().into_bytes();
+ let ubs = "this is also too long and shouldn't be fixed".to_string().into_bytes();
+
+ let strify = stringify!(foobar).as_bytes();
+
+ let current_version = env!("CARGO_PKG_VERSION").as_bytes();
+
+ let includestr = include_bytes!("string_lit_as_bytes.rs");
+
+ let _ = b"string with newline\t\n";
++
++ let _ = match "x".as_bytes() {
++ b"xx" => 0,
++ [b'x', ..] => 1,
++ _ => 2,
++ };
+}
+
+fn main() {}
--- /dev/null
+// run-rustfix
+
+#![allow(dead_code, unused_variables)]
+#![warn(clippy::string_lit_as_bytes)]
+
+fn str_lit_as_bytes() {
+ let bs = "hello there".as_bytes();
+
+ let bs = r###"raw string with 3# plus " ""###.as_bytes();
+
+ let bs = "lit to string".to_string().into_bytes();
+ let bs = "lit to owned".to_owned().into_bytes();
+
+ // no warning, because these cannot be written as byte string literals:
+ let ubs = "☃".as_bytes();
+ let ubs = "hello there! this is a very long string".as_bytes();
+
+ let ubs = "☃".to_string().into_bytes();
+ let ubs = "this is also too long and shouldn't be fixed".to_string().into_bytes();
+
+ let strify = stringify!(foobar).as_bytes();
+
+ let current_version = env!("CARGO_PKG_VERSION").as_bytes();
+
+ let includestr = include_str!("string_lit_as_bytes.rs").as_bytes();
+
+ let _ = "string with newline\t\n".as_bytes();
++
++ let _ = match "x".as_bytes() {
++ b"xx" => 0,
++ [b'x', ..] => 1,
++ _ => 2,
++ };
+}
+
+fn main() {}
--- /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}");
+ }
+ }
++
++ assert!(var == 1, "p5 {}", var);
++ debug_assert!(var == 1, "p6 {}", var);
+}
--- /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}");
+ }
+ }
++
++ assert!(var == 1, "p5 {var}");
++ debug_assert!(var == 1, "p6 {var}");
+}
--- /dev/null
- error: aborting due to 4 previous errors
+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: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:30:5
++ |
++LL | assert!(var == 1, "p5 {}", var);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - assert!(var == 1, "p5 {}", var);
++LL + assert!(var == 1, "p5 {var}");
++ |
++
++error: variables can be used directly in the `format!` string
++ --> $DIR/uninlined_format_args_panic.rs:31:5
++ |
++LL | debug_assert!(var == 1, "p6 {}", var);
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++help: change this to
++ |
++LL - debug_assert!(var == 1, "p6 {}", var);
++LL + debug_assert!(var == 1, "p6 {var}");
++ |
++
++error: aborting due to 6 previous errors
+
--- /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}");
+ }
+ }
++
++ assert!(var == 1, "p5 {}", var);
++ debug_assert!(var == 1, "p6 {}", var);
+}
--- /dev/null
+// run-rustfix
+
+#![allow(clippy::needless_borrow, clippy::ptr_arg)]
+#![warn(clippy::unnecessary_to_owned)]
+
+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) {}
+
+#[clippy::msrv = "1.35"]
+fn _msrv_1_35() {
+ // `copied` was stabilized in 1.36, so clippy should use `cloned`.
+ let _ = &["x"][..].iter().cloned();
+}
+
+#[clippy::msrv = "1.36"]
+fn _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;
+ }
+}
+
+mod issue_9771a {
+ #![allow(dead_code)]
+
+ use std::marker::PhantomData;
+
+ pub struct Key<K: AsRef<[u8]>, V: ?Sized>(K, PhantomData<V>);
+
+ impl<K: AsRef<[u8]>, V: ?Sized> Key<K, V> {
+ pub fn new(key: K) -> Key<K, V> {
+ Key(key, PhantomData)
+ }
+ }
+
+ pub fn pkh(pkh: &[u8]) -> Key<Vec<u8>, String> {
+ Key::new([b"pkh-", pkh].concat().to_vec())
+ }
+}
+
+mod issue_9771b {
+ #![allow(dead_code)]
+
+ pub struct Key<K: AsRef<[u8]>>(K);
+
+ pub fn from(c: &[u8]) -> Key<Vec<u8>> {
+ let v = [c].concat();
+ Key(v.to_vec())
+ }
+}
++
++// This is a watered down version of the code in: https://github.com/oxigraph/rio
++// The ICE is triggered by the call to `to_owned` on this line:
++// https://github.com/oxigraph/rio/blob/66635b9ff8e5423e58932353fa40d6e64e4820f7/testsuite/src/parser_evaluator.rs#L116
++mod issue_10021 {
++ #![allow(unused)]
++
++ pub struct Iri<T>(T);
++
++ impl<T: AsRef<str>> Iri<T> {
++ pub fn parse(iri: T) -> Result<Self, ()> {
++ unimplemented!()
++ }
++ }
++
++ pub fn parse_w3c_rdf_test_file(url: &str) -> Result<(), ()> {
++ let base_iri = Iri::parse(url.to_owned())?;
++ Ok(())
++ }
++}
--- /dev/null
+// run-rustfix
+
+#![allow(clippy::needless_borrow, clippy::ptr_arg)]
+#![warn(clippy::unnecessary_to_owned)]
+
+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) {}
+
+#[clippy::msrv = "1.35"]
+fn _msrv_1_35() {
+ // `copied` was stabilized in 1.36, so clippy should use `cloned`.
+ let _ = &["x"][..].to_vec().into_iter();
+}
+
+#[clippy::msrv = "1.36"]
+fn _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;
+ }
+}
+
+mod issue_9771a {
+ #![allow(dead_code)]
+
+ use std::marker::PhantomData;
+
+ pub struct Key<K: AsRef<[u8]>, V: ?Sized>(K, PhantomData<V>);
+
+ impl<K: AsRef<[u8]>, V: ?Sized> Key<K, V> {
+ pub fn new(key: K) -> Key<K, V> {
+ Key(key, PhantomData)
+ }
+ }
+
+ pub fn pkh(pkh: &[u8]) -> Key<Vec<u8>, String> {
+ Key::new([b"pkh-", pkh].concat().to_vec())
+ }
+}
+
+mod issue_9771b {
+ #![allow(dead_code)]
+
+ pub struct Key<K: AsRef<[u8]>>(K);
+
+ pub fn from(c: &[u8]) -> Key<Vec<u8>> {
+ let v = [c].concat();
+ Key(v.to_vec())
+ }
+}
++
++// This is a watered down version of the code in: https://github.com/oxigraph/rio
++// The ICE is triggered by the call to `to_owned` on this line:
++// https://github.com/oxigraph/rio/blob/66635b9ff8e5423e58932353fa40d6e64e4820f7/testsuite/src/parser_evaluator.rs#L116
++mod issue_10021 {
++ #![allow(unused)]
++
++ pub struct Iri<T>(T);
++
++ impl<T: AsRef<str>> Iri<T> {
++ pub fn parse(iri: T) -> Result<Self, ()> {
++ unimplemented!()
++ }
++ }
++
++ pub fn parse_w3c_rdf_test_file(url: &str) -> Result<(), ()> {
++ let base_iri = Iri::parse(url.to_owned())?;
++ Ok(())
++ }
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![feature(lang_items, start, libc)]
++#![no_std]
++#![deny(clippy::zero_ptr)]
++
++#[start]
++fn main(_argc: isize, _argv: *const *const u8) -> isize {
++ let _ = core::ptr::null::<usize>();
++ let _ = core::ptr::null_mut::<f64>();
++ let _: *const u8 = core::ptr::null();
++ 0
++}
++
++#[panic_handler]
++fn panic(_info: &core::panic::PanicInfo) -> ! {
++ loop {}
++}
++
++#[lang = "eh_personality"]
++extern "C" fn eh_personality() {}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![feature(lang_items, start, libc)]
++#![no_std]
++#![deny(clippy::zero_ptr)]
++
++#[start]
++fn main(_argc: isize, _argv: *const *const u8) -> isize {
++ let _ = 0 as *const usize;
++ let _ = 0 as *mut f64;
++ let _: *const u8 = 0 as *const _;
++ 0
++}
++
++#[panic_handler]
++fn panic(_info: &core::panic::PanicInfo) -> ! {
++ loop {}
++}
++
++#[lang = "eh_personality"]
++extern "C" fn eh_personality() {}
--- /dev/null
--- /dev/null
++error: `0 as *const _` detected
++ --> $DIR/zero_ptr_no_std.rs:9:13
++ |
++LL | let _ = 0 as *const usize;
++ | ^^^^^^^^^^^^^^^^^ help: try: `core::ptr::null::<usize>()`
++ |
++note: the lint level is defined here
++ --> $DIR/zero_ptr_no_std.rs:5:9
++ |
++LL | #![deny(clippy::zero_ptr)]
++ | ^^^^^^^^^^^^^^^^
++
++error: `0 as *mut _` detected
++ --> $DIR/zero_ptr_no_std.rs:10:13
++ |
++LL | let _ = 0 as *mut f64;
++ | ^^^^^^^^^^^^^ help: try: `core::ptr::null_mut::<f64>()`
++
++error: `0 as *const _` detected
++ --> $DIR/zero_ptr_no_std.rs:11:24
++ |
++LL | let _: *const u8 = 0 as *const _;
++ | ^^^^^^^^^^^^^ help: try: `core::ptr::null()`
++
++error: aborting due to 3 previous errors
++
--- /dev/null
- use rustc_tools_util::VersionInfo;
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+#![allow(clippy::single_match_else)]
+
+use std::fs;
+
+#[test]
+fn consistent_clippy_crate_versions() {
+ 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 paths = [
+ "declare_clippy_lint/Cargo.toml",
+ "clippy_lints/Cargo.toml",
+ "clippy_utils/Cargo.toml",
+ ];
+
+ for path in paths {
+ assert_eq!(clippy_version, read_version(path), "{path} version differs");
+ }
+}
+
+#[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
- "good-first-issue"
+[relabel]
+allow-unauthenticated = [
+ "A-*", "C-*", "E-*", "I-*", "L-*", "P-*", "S-*", "T-*",
++ "good-first-issue", "beta-nominated"
+]
+
+# Allows shortcuts like `@rustbot ready`
+#
+# See https://github.com/rust-lang/triagebot/wiki/Shortcuts
+[shortcut]
+
+[autolabel."S-waiting-on-review"]
+new_pr = true
+
+[assign]
+contributing_url = "https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md"
+
+[assign.owners]
+"/.github" = ["@flip1995"]
+"*" = [
+ "@flip1995",
+ "@Manishearth",
+ "@llogiq",
+ "@giraffate",
+ "@xFrednet",
+ "@Alexendoo",
+ "@dswij",
+ "@Jarcho",
+]
projects / rust.git / commitdiff