--- /dev/null
+#!/bin/bash
+
+set -ex
+
+# Check sysroot handling
+sysroot=$(./target/debug/clippy-driver --print sysroot)
+test "$sysroot" = "$(rustc --print sysroot)"
+
+if [[ ${OS} == "Windows" ]]; then
+ desired_sysroot=C:/tmp
+else
+ desired_sysroot=/tmp
+fi
+sysroot=$(./target/debug/clippy-driver --sysroot $desired_sysroot --print sysroot)
+test "$sysroot" = $desired_sysroot
+
+sysroot=$(SYSROOT=$desired_sysroot ./target/debug/clippy-driver --print sysroot)
+test "$sysroot" = $desired_sysroot
+
++# Check that the --sysroot argument is only passed once (SYSROOT is ignored)
++(
++ cd rustc_tools_util
++ touch src/lib.rs
++ SYSROOT=/tmp RUSTFLAGS="--sysroot=$(rustc --print sysroot)" ../target/debug/cargo-clippy clippy --verbose
++)
++
+# Make sure this isn't set - clippy-driver should cope without it
+unset CARGO_MANIFEST_DIR
+
+# Run a lint and make sure it produces the expected output. It's also expected to exit with code 1
+# FIXME: How to match the clippy invocation in compile-test.rs?
+./target/debug/clippy-driver -Dwarnings -Aunused -Zui-testing --emit metadata --crate-type bin tests/ui/double_neg.rs 2>double_neg.stderr && exit 1
+sed -e "s,tests/ui,\$DIR," -e "/= help/d" double_neg.stderr >normalized.stderr
+diff -u normalized.stderr tests/ui/double_neg.stderr
+
+# make sure "clippy-driver --rustc --arg" and "rustc --arg" behave the same
+SYSROOT=$(rustc --print sysroot)
+diff -u <(LD_LIBRARY_PATH=${SYSROOT}/lib ./target/debug/clippy-driver --rustc --version --verbose) <(rustc --version --verbose)
+
+echo "fn main() {}" >target/driver_test.rs
+# we can't run 2 rustcs on the same file at the same time
+CLIPPY=$(LD_LIBRARY_PATH=${SYSROOT}/lib ./target/debug/clippy-driver ./target/driver_test.rs --rustc)
+RUSTC=$(rustc ./target/driver_test.rs)
+diff -u <($CLIPPY) <($RUSTC)
+
+# TODO: CLIPPY_CONF_DIR / CARGO_MANIFEST_DIR
--- /dev/null
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Changelog Update](book/src/development/infrastructure/changelog_update.md) if you want to update this
+document.
+
+## Unreleased / Beta / In Rust Nightly
+
+[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
+
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+[`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
- If you're using `rustup` to install and manage you're Rust toolchains, Clippy is
+# Installation
+
++If you're using `rustup` to install and manage your Rust toolchains, Clippy is
+usually **already installed**. In that case you can skip this chapter and go to
+the [Usage] chapter.
+
+> Note: If you used the `minimal` profile when installing a Rust toolchain,
+> Clippy is not automatically installed.
+
+## Using Rustup
+
+If Clippy was not installed for a toolchain, it can be installed with
+
+```
+$ rustup component add clippy [--toolchain=<name>]
+```
+
+## From Source
+
+Take a look at the [Basics] chapter in the Clippy developer guide to find step
+by step instructions on how to build and install Clippy from source.
+
+[Basics]: development/basics.md#install-from-source
+[Usage]: usage.md
--- /dev/null
+#![feature(let_chains)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![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)]
+
++// The `rustc_driver` crate seems to be required in order to use the `rust_lexer` crate.
++#[allow(unused_extern_crates)]
++extern crate rustc_driver;
+extern crate rustc_lexer;
+
+use std::path::PathBuf;
+
+pub mod bless;
+pub mod dogfood;
+pub mod fmt;
+pub mod lint;
+pub mod new_lint;
+pub mod serve;
+pub mod setup;
+pub mod update_lints;
+
+#[cfg(not(windows))]
+static CARGO_CLIPPY_EXE: &str = "cargo-clippy";
+#[cfg(windows)]
+static CARGO_CLIPPY_EXE: &str = "cargo-clippy.exe";
+
+/// Returns the path to the `cargo-clippy` binary
+#[must_use]
+pub fn cargo_clippy_path() -> PathBuf {
+ let mut path = std::env::current_exe().expect("failed to get current executable name");
+ path.set_file_name(CARGO_CLIPPY_EXE);
+ path
+}
+
+/// Returns the path to the Clippy project directory
+///
+/// # Panics
+///
+/// Panics if the current directory could not be retrieved, there was an error reading any of the
+/// Cargo.toml files or ancestor directory is the clippy root directory
+#[must_use]
+pub fn clippy_project_root() -> PathBuf {
+ let current_dir = std::env::current_dir().unwrap();
+ for path in current_dir.ancestors() {
+ let result = std::fs::read_to_string(path.join("Cargo.toml"));
+ if let Err(err) = &result {
+ if err.kind() == std::io::ErrorKind::NotFound {
+ continue;
+ }
+ }
+
+ let content = result.unwrap();
+ if content.contains("[package]\nname = \"clippy\"") {
+ return path.to_path_buf();
+ }
+ }
+ panic!("error: Can't determine root of project. Please run inside a Clippy working dir.");
+}
--- /dev/null
- use rustc_middle::lint::in_external_macro;
+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};
- format!("Box::<{arg_ty}>::default()")
++use rustc_middle::{lint::in_external_macro, ty::print::with_forced_trimmed_paths};
+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 {
++ with_forced_trimmed_paths!(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
- let mut walker = ContainsName { name, result: false };
+use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_then};
+use clippy_utils::source::{first_line_of_span, indent_of, reindent_multiline, snippet, snippet_opt};
+use clippy_utils::ty::needs_ordered_drop;
+use clippy_utils::visitors::for_each_expr;
+use clippy_utils::{
+ capture_local_usage, eq_expr_value, get_enclosing_block, hash_expr, hash_stmt, if_sequence, is_else_clause,
+ is_lint_allowed, path_to_local, search_same, ContainsName, HirEqInterExpr, SpanlessEq,
+};
+use core::iter;
+use core::ops::ControlFlow;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit;
+use rustc_hir::{BinOpKind, Block, Expr, ExprKind, HirId, HirIdSet, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::hygiene::walk_chain;
+use rustc_span::source_map::SourceMap;
+use rustc_span::{BytePos, Span, Symbol};
+use std::borrow::Cow;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for consecutive `if`s with the same condition.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if a == b {
+ /// …
+ /// } else if a == b {
+ /// …
+ /// }
+ /// ```
+ ///
+ /// Note that this lint ignores all conditions with a function call as it could
+ /// have side effects:
+ ///
+ /// ```ignore
+ /// if foo() {
+ /// …
+ /// } else if foo() { // not linted
+ /// …
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub IFS_SAME_COND,
+ correctness,
+ "consecutive `if`s with the same condition"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for consecutive `if`s with the same function call.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error.
+ /// Despite the fact that function can have side effects and `if` works as
+ /// intended, such an approach is implicit and can be considered a "code smell".
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if foo() == bar {
+ /// …
+ /// } else if foo() == bar {
+ /// …
+ /// }
+ /// ```
+ ///
+ /// This probably should be:
+ /// ```ignore
+ /// if foo() == bar {
+ /// …
+ /// } else if foo() == baz {
+ /// …
+ /// }
+ /// ```
+ ///
+ /// or if the original code was not a typo and called function mutates a state,
+ /// consider move the mutation out of the `if` condition to avoid similarity to
+ /// a copy & paste error:
+ ///
+ /// ```ignore
+ /// let first = foo();
+ /// if first == bar {
+ /// …
+ /// } else {
+ /// let second = foo();
+ /// if second == bar {
+ /// …
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.41.0"]
+ pub SAME_FUNCTIONS_IN_IF_CONDITION,
+ pedantic,
+ "consecutive `if`s with the same function call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `if/else` with the same body as the *then* part
+ /// and the *else* part.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// let foo = if … {
+ /// 42
+ /// } else {
+ /// 42
+ /// };
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub IF_SAME_THEN_ELSE,
+ correctness,
+ "`if` with the same `then` and `else` blocks"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks if the `if` and `else` block contain shared code that can be
+ /// moved out of the blocks.
+ ///
+ /// ### Why is this bad?
+ /// Duplicate code is less maintainable.
+ ///
+ /// ### Known problems
+ /// * The lint doesn't check if the moved expressions modify values that are being used in
+ /// the if condition. The suggestion can in that case modify the behavior of the program.
+ /// See [rust-clippy#7452](https://github.com/rust-lang/rust-clippy/issues/7452)
+ ///
+ /// ### Example
+ /// ```ignore
+ /// let foo = if … {
+ /// println!("Hello World");
+ /// 13
+ /// } else {
+ /// println!("Hello World");
+ /// 42
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```ignore
+ /// println!("Hello World");
+ /// let foo = if … {
+ /// 13
+ /// } else {
+ /// 42
+ /// };
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub BRANCHES_SHARING_CODE,
+ nursery,
+ "`if` statement with shared code in all blocks"
+}
+
+declare_lint_pass!(CopyAndPaste => [
+ IFS_SAME_COND,
+ SAME_FUNCTIONS_IN_IF_CONDITION,
+ IF_SAME_THEN_ELSE,
+ BRANCHES_SHARING_CODE
+]);
+
+impl<'tcx> LateLintPass<'tcx> for CopyAndPaste {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if !expr.span.from_expansion() && matches!(expr.kind, ExprKind::If(..)) && !is_else_clause(cx.tcx, expr) {
+ let (conds, blocks) = if_sequence(expr);
+ lint_same_cond(cx, &conds);
+ lint_same_fns_in_if_cond(cx, &conds);
+ let all_same =
+ !is_lint_allowed(cx, IF_SAME_THEN_ELSE, expr.hir_id) && lint_if_same_then_else(cx, &conds, &blocks);
+ if !all_same && conds.len() != blocks.len() {
+ lint_branches_sharing_code(cx, &conds, &blocks, expr);
+ }
+ }
+ }
+}
+
+/// Checks if the given expression is a let chain.
+fn contains_let(e: &Expr<'_>) -> bool {
+ match e.kind {
+ ExprKind::Let(..) => true,
+ ExprKind::Binary(op, lhs, rhs) if op.node == BinOpKind::And => {
+ matches!(lhs.kind, ExprKind::Let(..)) || contains_let(rhs)
+ },
+ _ => false,
+ }
+}
+
+fn lint_if_same_then_else(cx: &LateContext<'_>, conds: &[&Expr<'_>], blocks: &[&Block<'_>]) -> bool {
+ let mut eq = SpanlessEq::new(cx);
+ blocks
+ .array_windows::<2>()
+ .enumerate()
+ .fold(true, |all_eq, (i, &[lhs, rhs])| {
+ if eq.eq_block(lhs, rhs) && !contains_let(conds[i]) && conds.get(i + 1).map_or(true, |e| !contains_let(e)) {
+ span_lint_and_note(
+ cx,
+ IF_SAME_THEN_ELSE,
+ lhs.span,
+ "this `if` has identical blocks",
+ Some(rhs.span),
+ "same as this",
+ );
+ all_eq
+ } else {
+ false
+ }
+ })
+}
+
+fn lint_branches_sharing_code<'tcx>(
+ cx: &LateContext<'tcx>,
+ conds: &[&'tcx Expr<'_>],
+ blocks: &[&'tcx Block<'_>],
+ expr: &'tcx Expr<'_>,
+) {
+ // We only lint ifs with multiple blocks
+ let &[first_block, ref blocks @ ..] = blocks else {
+ return;
+ };
+ let &[.., last_block] = blocks else {
+ return;
+ };
+
+ let res = scan_block_for_eq(cx, conds, first_block, blocks);
+ let sm = cx.tcx.sess.source_map();
+ let start_suggestion = res.start_span(first_block, sm).map(|span| {
+ let first_line_span = first_line_of_span(cx, expr.span);
+ let replace_span = first_line_span.with_hi(span.hi());
+ let cond_span = first_line_span.until(first_block.span);
+ let cond_snippet = reindent_multiline(snippet(cx, cond_span, "_"), false, None);
+ let cond_indent = indent_of(cx, cond_span);
+ let moved_snippet = reindent_multiline(snippet(cx, span, "_"), true, None);
+ let suggestion = moved_snippet.to_string() + "\n" + &cond_snippet + "{";
+ let suggestion = reindent_multiline(Cow::Borrowed(&suggestion), true, cond_indent);
+ (replace_span, suggestion.to_string())
+ });
+ let end_suggestion = res.end_span(last_block, sm).map(|span| {
+ let moved_snipped = reindent_multiline(snippet(cx, span, "_"), true, None);
+ let indent = indent_of(cx, expr.span.shrink_to_hi());
+ let suggestion = "}\n".to_string() + &moved_snipped;
+ let suggestion = reindent_multiline(Cow::Borrowed(&suggestion), true, indent);
+
+ let span = span.with_hi(last_block.span.hi());
+ // Improve formatting if the inner block has indention (i.e. normal Rust formatting)
+ let test_span = Span::new(span.lo() - BytePos(4), span.lo(), span.ctxt(), span.parent());
+ let span = if snippet_opt(cx, test_span).map_or(false, |snip| snip == " ") {
+ span.with_lo(test_span.lo())
+ } else {
+ span
+ };
+ (span, suggestion.to_string())
+ });
+
+ let (span, msg, end_span) = match (&start_suggestion, &end_suggestion) {
+ (&Some((span, _)), &Some((end_span, _))) => (
+ span,
+ "all if blocks contain the same code at both the start and the end",
+ Some(end_span),
+ ),
+ (&Some((span, _)), None) => (span, "all if blocks contain the same code at the start", None),
+ (None, &Some((span, _))) => (span, "all if blocks contain the same code at the end", None),
+ (None, None) => return,
+ };
+ span_lint_and_then(cx, BRANCHES_SHARING_CODE, span, msg, |diag| {
+ if let Some(span) = end_span {
+ diag.span_note(span, "this code is shared at the end");
+ }
+ if let Some((span, sugg)) = start_suggestion {
+ diag.span_suggestion(
+ span,
+ "consider moving these statements before the if",
+ sugg,
+ Applicability::Unspecified,
+ );
+ }
+ if let Some((span, sugg)) = end_suggestion {
+ diag.span_suggestion(
+ span,
+ "consider moving these statements after the if",
+ sugg,
+ Applicability::Unspecified,
+ );
+ if !cx.typeck_results().expr_ty(expr).is_unit() {
+ diag.note("the end suggestion probably needs some adjustments to use the expression result correctly");
+ }
+ }
+ if check_for_warn_of_moved_symbol(cx, &res.moved_locals, expr) {
+ diag.warn("some moved values might need to be renamed to avoid wrong references");
+ }
+ });
+}
+
+struct BlockEq {
+ /// The end of the range of equal stmts at the start.
+ start_end_eq: usize,
+ /// The start of the range of equal stmts at the end.
+ end_begin_eq: Option<usize>,
+ /// The name and id of every local which can be moved at the beginning and the end.
+ moved_locals: Vec<(HirId, Symbol)>,
+}
+impl BlockEq {
+ fn start_span(&self, b: &Block<'_>, sm: &SourceMap) -> Option<Span> {
+ match &b.stmts[..self.start_end_eq] {
+ [first, .., last] => Some(sm.stmt_span(first.span, b.span).to(sm.stmt_span(last.span, b.span))),
+ [s] => Some(sm.stmt_span(s.span, b.span)),
+ [] => None,
+ }
+ }
+
+ fn end_span(&self, b: &Block<'_>, sm: &SourceMap) -> Option<Span> {
+ match (&b.stmts[b.stmts.len() - self.end_begin_eq?..], b.expr) {
+ ([first, .., last], None) => Some(sm.stmt_span(first.span, b.span).to(sm.stmt_span(last.span, b.span))),
+ ([first, ..], Some(last)) => Some(sm.stmt_span(first.span, b.span).to(sm.stmt_span(last.span, b.span))),
+ ([s], None) => Some(sm.stmt_span(s.span, b.span)),
+ ([], Some(e)) => Some(walk_chain(e.span, b.span.ctxt())),
+ ([], None) => None,
+ }
+ }
+}
+
+/// If the statement is a local, checks if the bound names match the expected list of names.
+fn eq_binding_names(s: &Stmt<'_>, names: &[(HirId, Symbol)]) -> bool {
+ if let StmtKind::Local(l) = s.kind {
+ let mut i = 0usize;
+ let mut res = true;
+ l.pat.each_binding_or_first(&mut |_, _, _, name| {
+ if names.get(i).map_or(false, |&(_, n)| n == name.name) {
+ i += 1;
+ } else {
+ res = false;
+ }
+ });
+ res && i == names.len()
+ } else {
+ false
+ }
+}
+
+/// Checks if the statement modifies or moves any of the given locals.
+fn modifies_any_local<'tcx>(cx: &LateContext<'tcx>, s: &'tcx Stmt<'_>, locals: &HirIdSet) -> bool {
+ for_each_expr(s, |e| {
+ if let Some(id) = path_to_local(e)
+ && locals.contains(&id)
+ && !capture_local_usage(cx, e).is_imm_ref()
+ {
+ ControlFlow::Break(())
+ } else {
+ ControlFlow::Continue(())
+ }
+ })
+ .is_some()
+}
+
+/// Checks if the given statement should be considered equal to the statement in the same position
+/// for each block.
+fn eq_stmts(
+ stmt: &Stmt<'_>,
+ blocks: &[&Block<'_>],
+ get_stmt: impl for<'a> Fn(&'a Block<'a>) -> Option<&'a Stmt<'a>>,
+ eq: &mut HirEqInterExpr<'_, '_, '_>,
+ moved_bindings: &mut Vec<(HirId, Symbol)>,
+) -> bool {
+ (if let StmtKind::Local(l) = stmt.kind {
+ let old_count = moved_bindings.len();
+ l.pat.each_binding_or_first(&mut |_, id, _, name| {
+ moved_bindings.push((id, name.name));
+ });
+ let new_bindings = &moved_bindings[old_count..];
+ blocks
+ .iter()
+ .all(|b| get_stmt(b).map_or(false, |s| eq_binding_names(s, new_bindings)))
+ } else {
+ true
+ }) && blocks
+ .iter()
+ .all(|b| get_stmt(b).map_or(false, |s| eq.eq_stmt(s, stmt)))
+}
+
+#[expect(clippy::too_many_lines)]
+fn scan_block_for_eq<'tcx>(
+ cx: &LateContext<'tcx>,
+ conds: &[&'tcx Expr<'_>],
+ block: &'tcx Block<'_>,
+ blocks: &[&'tcx Block<'_>],
+) -> BlockEq {
+ let mut eq = SpanlessEq::new(cx);
+ let mut eq = eq.inter_expr();
+ let mut moved_locals = Vec::new();
+
+ let mut cond_locals = HirIdSet::default();
+ for &cond in conds {
+ let _: Option<!> = for_each_expr(cond, |e| {
+ if let Some(id) = path_to_local(e) {
+ cond_locals.insert(id);
+ }
+ ControlFlow::Continue(())
+ });
+ }
+
+ let mut local_needs_ordered_drop = false;
+ let start_end_eq = block
+ .stmts
+ .iter()
+ .enumerate()
+ .find(|&(i, stmt)| {
+ if let StmtKind::Local(l) = stmt.kind
+ && needs_ordered_drop(cx, cx.typeck_results().node_type(l.hir_id))
+ {
+ local_needs_ordered_drop = true;
+ return true;
+ }
+ modifies_any_local(cx, stmt, &cond_locals)
+ || !eq_stmts(stmt, blocks, |b| b.stmts.get(i), &mut eq, &mut moved_locals)
+ })
+ .map_or(block.stmts.len(), |(i, _)| i);
+
+ if local_needs_ordered_drop {
+ return BlockEq {
+ start_end_eq,
+ end_begin_eq: None,
+ moved_locals,
+ };
+ }
+
+ // Walk backwards through the final expression/statements so long as their hashes are equal. Note
+ // `SpanlessHash` treats all local references as equal allowing locals declared earlier in the block
+ // to match those in other blocks. e.g. If each block ends with the following the hash value will be
+ // the same even though each `x` binding will have a different `HirId`:
+ // let x = foo();
+ // x + 50
+ let expr_hash_eq = if let Some(e) = block.expr {
+ let hash = hash_expr(cx, e);
+ blocks
+ .iter()
+ .all(|b| b.expr.map_or(false, |e| hash_expr(cx, e) == hash))
+ } else {
+ blocks.iter().all(|b| b.expr.is_none())
+ };
+ if !expr_hash_eq {
+ return BlockEq {
+ start_end_eq,
+ end_begin_eq: None,
+ moved_locals,
+ };
+ }
+ let end_search_start = block.stmts[start_end_eq..]
+ .iter()
+ .rev()
+ .enumerate()
+ .find(|&(offset, stmt)| {
+ let hash = hash_stmt(cx, stmt);
+ blocks.iter().any(|b| {
+ b.stmts
+ // the bounds check will catch the underflow
+ .get(b.stmts.len().wrapping_sub(offset + 1))
+ .map_or(true, |s| hash != hash_stmt(cx, s))
+ })
+ })
+ .map_or(block.stmts.len() - start_end_eq, |(i, _)| i);
+
+ let moved_locals_at_start = moved_locals.len();
+ let mut i = end_search_start;
+ let end_begin_eq = block.stmts[block.stmts.len() - end_search_start..]
+ .iter()
+ .zip(iter::repeat_with(move || {
+ let x = i;
+ i -= 1;
+ x
+ }))
+ .fold(end_search_start, |init, (stmt, offset)| {
+ if eq_stmts(
+ stmt,
+ blocks,
+ |b| b.stmts.get(b.stmts.len() - offset),
+ &mut eq,
+ &mut moved_locals,
+ ) {
+ init
+ } else {
+ // Clear out all locals seen at the end so far. None of them can be moved.
+ let stmts = &blocks[0].stmts;
+ for stmt in &stmts[stmts.len() - init..=stmts.len() - offset] {
+ if let StmtKind::Local(l) = stmt.kind {
+ l.pat.each_binding_or_first(&mut |_, id, _, _| {
+ eq.locals.remove(&id);
+ });
+ }
+ }
+ moved_locals.truncate(moved_locals_at_start);
+ offset - 1
+ }
+ });
+ if let Some(e) = block.expr {
+ for block in blocks {
+ if block.expr.map_or(false, |expr| !eq.eq_expr(expr, e)) {
+ moved_locals.truncate(moved_locals_at_start);
+ return BlockEq {
+ start_end_eq,
+ end_begin_eq: None,
+ moved_locals,
+ };
+ }
+ }
+ }
+
+ BlockEq {
+ start_end_eq,
+ end_begin_eq: Some(end_begin_eq),
+ moved_locals,
+ }
+}
+
+fn check_for_warn_of_moved_symbol(cx: &LateContext<'_>, symbols: &[(HirId, Symbol)], if_expr: &Expr<'_>) -> bool {
+ get_enclosing_block(cx, if_expr.hir_id).map_or(false, |block| {
+ let ignore_span = block.span.shrink_to_lo().to(if_expr.span);
+
+ symbols
+ .iter()
+ .filter(|&&(_, name)| !name.as_str().starts_with('_'))
+ .any(|&(_, name)| {
++ let mut walker = ContainsName {
++ name,
++ result: false,
++ cx,
++ };
+
+ // Scan block
+ block
+ .stmts
+ .iter()
+ .filter(|stmt| !ignore_span.overlaps(stmt.span))
+ .for_each(|stmt| intravisit::walk_stmt(&mut walker, stmt));
+
+ if let Some(expr) = block.expr {
+ intravisit::walk_expr(&mut walker, expr);
+ }
+
+ walker.result
+ })
+ })
+}
+
+/// Implementation of `IFS_SAME_COND`.
+fn lint_same_cond(cx: &LateContext<'_>, conds: &[&Expr<'_>]) {
+ for (i, j) in search_same(conds, |e| hash_expr(cx, e), |lhs, rhs| eq_expr_value(cx, lhs, rhs)) {
+ span_lint_and_note(
+ cx,
+ IFS_SAME_COND,
+ j.span,
+ "this `if` has the same condition as a previous `if`",
+ Some(i.span),
+ "same as this",
+ );
+ }
+}
+
+/// Implementation of `SAME_FUNCTIONS_IN_IF_CONDITION`.
+fn lint_same_fns_in_if_cond(cx: &LateContext<'_>, conds: &[&Expr<'_>]) {
+ let eq: &dyn Fn(&&Expr<'_>, &&Expr<'_>) -> bool = &|&lhs, &rhs| -> bool {
+ // Do not lint if any expr originates from a macro
+ if lhs.span.from_expansion() || rhs.span.from_expansion() {
+ return false;
+ }
+ // Do not spawn warning if `IFS_SAME_COND` already produced it.
+ if eq_expr_value(cx, lhs, rhs) {
+ return false;
+ }
+ SpanlessEq::new(cx).eq_expr(lhs, rhs)
+ };
+
+ for (i, j) in search_same(conds, |e| hash_expr(cx, e), eq) {
+ span_lint_and_note(
+ cx,
+ SAME_FUNCTIONS_IN_IF_CONDITION,
+ j.span,
+ "this `if` has the same function call as a previous `if`",
+ Some(i.span),
+ "same as this",
+ );
+ }
+}
--- /dev/null
- /// Checks for usage of dbg!() macro.
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::macros::root_macro_call_first_node;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{is_in_cfg_test, is_in_test_function};
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
- /// `dbg!` macro is intended as a debugging tool. It
- /// should not be in version control.
++ /// Checks for usage of the [`dbg!`](https://doc.rust-lang.org/std/macro.dbg.html) macro.
+ ///
+ /// ### Why is this bad?
- "`dbg!` macro is intended as a debugging tool",
- "ensure to avoid having uses of it in version control",
++ /// The `dbg!` macro is intended as a debugging tool. It should not be present in released
++ /// software or committed to a version control system.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// dbg!(true)
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// true
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub DBG_MACRO,
+ restriction,
+ "`dbg!` macro is intended as a debugging tool"
+}
+
+#[derive(Copy, Clone)]
+pub struct DbgMacro {
+ allow_dbg_in_tests: bool,
+}
+
+impl_lint_pass!(DbgMacro => [DBG_MACRO]);
+
+impl DbgMacro {
+ pub fn new(allow_dbg_in_tests: bool) -> Self {
+ DbgMacro { allow_dbg_in_tests }
+ }
+}
+
+impl LateLintPass<'_> for DbgMacro {
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+ let Some(macro_call) = root_macro_call_first_node(cx, expr) else { return };
+ if cx.tcx.is_diagnostic_item(sym::dbg_macro, macro_call.def_id) {
+ // allows `dbg!` in test code if allow-dbg-in-test is set to true in clippy.toml
+ if self.allow_dbg_in_tests
+ && (is_in_test_function(cx.tcx, expr.hir_id) || is_in_cfg_test(cx.tcx, expr.hir_id))
+ {
+ return;
+ }
+ let mut applicability = Applicability::MachineApplicable;
+ let suggestion = match expr.peel_drop_temps().kind {
+ // dbg!()
+ ExprKind::Block(_, _) => String::new(),
+ // dbg!(1)
+ ExprKind::Match(val, ..) => {
+ snippet_with_applicability(cx, val.span.source_callsite(), "..", &mut applicability).to_string()
+ },
+ // dbg!(2, 3)
+ ExprKind::Tup(
+ [
+ Expr {
+ kind: ExprKind::Match(first, ..),
+ ..
+ },
+ ..,
+ Expr {
+ kind: ExprKind::Match(last, ..),
+ ..
+ },
+ ],
+ ) => {
+ let snippet = snippet_with_applicability(
+ cx,
+ first.span.source_callsite().to(last.span.source_callsite()),
+ "..",
+ &mut applicability,
+ );
+ format!("({snippet})")
+ },
+ _ => return,
+ };
+
+ span_lint_and_sugg(
+ cx,
+ DBG_MACRO,
+ macro_call.span,
++ "the `dbg!` macro is intended as a debugging tool",
++ "remove the invocation before committing it to a version control system",
+ suggestion,
+ applicability,
+ );
+ }
+ }
+}
--- /dev/null
- crate::derive::DERIVE_HASH_XOR_EQ_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::DERIVED_HASH_WITH_MANUAL_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::fn_null_check::FN_NULL_CHECK_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::permissions_set_readonly_false::PERMISSIONS_SET_READONLY_FALSE_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::size_of_ref::SIZE_OF_REF_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_NULL_TO_FN_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
- // TODO: Work out a way to put "whatever the imported way of referencing
- // this type in this file" rather than a fully-qualified type.
- let replacement = format!("{}::default()", cx.tcx.def_path_str(def.did()));
+use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_sugg};
+use clippy_utils::source::snippet_with_macro_callsite;
+use clippy_utils::ty::{has_drop, is_copy};
+use clippy_utils::{
+ any_parent_is_automatically_derived, contains_name, get_parent_expr, is_from_proc_macro, match_def_path, paths,
+};
+use if_chain::if_chain;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_errors::Applicability;
+use rustc_hir::def::Res;
+use rustc_hir::{Block, Expr, ExprKind, PatKind, QPath, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
++use rustc_middle::ty::print::with_forced_trimmed_paths;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::{Ident, Symbol};
+use rustc_span::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for literal calls to `Default::default()`.
+ ///
+ /// ### Why is this bad?
+ /// It's easier for the reader if the name of the type is used, rather than the
+ /// generic `Default`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let s: String = Default::default();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let s = String::default();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DEFAULT_TRAIT_ACCESS,
+ pedantic,
+ "checks for literal calls to `Default::default()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for immediate reassignment of fields initialized
+ /// with Default::default().
+ ///
+ /// ### Why is this bad?
+ ///It's more idiomatic to use the [functional update syntax](https://doc.rust-lang.org/reference/expressions/struct-expr.html#functional-update-syntax).
+ ///
+ /// ### Known problems
+ /// Assignments to patterns that are of tuple type are not linted.
+ ///
+ /// ### Example
+ /// ```
+ /// # #[derive(Default)]
+ /// # struct A { i: i32 }
+ /// let mut a: A = Default::default();
+ /// a.i = 42;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```
+ /// # #[derive(Default)]
+ /// # struct A { i: i32 }
+ /// let a = A {
+ /// i: 42,
+ /// .. Default::default()
+ /// };
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub FIELD_REASSIGN_WITH_DEFAULT,
+ style,
+ "binding initialized with Default should have its fields set in the initializer"
+}
+
+#[derive(Default)]
+pub struct Default {
+ // Spans linted by `field_reassign_with_default`.
+ reassigned_linted: FxHashSet<Span>,
+}
+
+impl_lint_pass!(Default => [DEFAULT_TRAIT_ACCESS, FIELD_REASSIGN_WITH_DEFAULT]);
+
+impl<'tcx> LateLintPass<'tcx> for Default {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ if !expr.span.from_expansion();
+ // Avoid cases already linted by `field_reassign_with_default`
+ if !self.reassigned_linted.contains(&expr.span);
+ if let ExprKind::Call(path, ..) = expr.kind;
+ if !any_parent_is_automatically_derived(cx.tcx, expr.hir_id);
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id();
+ if match_def_path(cx, def_id, &paths::DEFAULT_TRAIT_METHOD);
+ if !is_update_syntax_base(cx, expr);
+ // Detect and ignore <Foo as Default>::default() because these calls do explicitly name the type.
+ if let QPath::Resolved(None, _path) = qpath;
+ let expr_ty = cx.typeck_results().expr_ty(expr);
+ if let ty::Adt(def, ..) = expr_ty.kind();
+ if !is_from_proc_macro(cx, expr);
+ then {
- if contains_name(binding_name, assign_rhs) {
++ let replacement = with_forced_trimmed_paths!(format!("{}::default()", cx.tcx.def_path_str(def.did())));
+ span_lint_and_sugg(
+ cx,
+ DEFAULT_TRAIT_ACCESS,
+ expr.span,
+ &format!("calling `{replacement}` is more clear than this expression"),
+ "try",
+ replacement,
+ Applicability::Unspecified, // First resolve the TODO above
+ );
+ }
+ }
+ }
+
+ #[expect(clippy::too_many_lines)]
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &Block<'tcx>) {
+ // start from the `let mut _ = _::default();` and look at all the following
+ // statements, see if they re-assign the fields of the binding
+ let stmts_head = match block.stmts {
+ // Skip the last statement since there cannot possibly be any following statements that re-assign fields.
+ [head @ .., _] if !head.is_empty() => head,
+ _ => return,
+ };
+ for (stmt_idx, stmt) in stmts_head.iter().enumerate() {
+ // find all binding statements like `let mut _ = T::default()` where `T::default()` is the
+ // `default` method of the `Default` trait, and store statement index in current block being
+ // checked and the name of the bound variable
+ let (local, variant, binding_name, binding_type, span) = if_chain! {
+ // only take `let ...` statements
+ if let StmtKind::Local(local) = stmt.kind;
+ if let Some(expr) = local.init;
+ if !any_parent_is_automatically_derived(cx.tcx, expr.hir_id);
+ if !expr.span.from_expansion();
+ // only take bindings to identifiers
+ if let PatKind::Binding(_, binding_id, ident, _) = local.pat.kind;
+ // only when assigning `... = Default::default()`
+ if is_expr_default(expr, cx);
+ let binding_type = cx.typeck_results().node_type(binding_id);
+ if let Some(adt) = binding_type.ty_adt_def();
+ if adt.is_struct();
+ let variant = adt.non_enum_variant();
+ if adt.did().is_local() || !variant.is_field_list_non_exhaustive();
+ let module_did = cx.tcx.parent_module(stmt.hir_id);
+ if variant
+ .fields
+ .iter()
+ .all(|field| field.vis.is_accessible_from(module_did, cx.tcx));
+ let all_fields_are_copy = variant
+ .fields
+ .iter()
+ .all(|field| {
+ is_copy(cx, cx.tcx.type_of(field.did))
+ });
+ if !has_drop(cx, binding_type) || all_fields_are_copy;
+ then {
+ (local, variant, ident.name, binding_type, expr.span)
+ } else {
+ continue;
+ }
+ };
+
+ // find all "later statement"'s where the fields of the binding set as
+ // Default::default() get reassigned, unless the reassignment refers to the original binding
+ let mut first_assign = None;
+ let mut assigned_fields = Vec::new();
+ let mut cancel_lint = false;
+ for consecutive_statement in &block.stmts[stmt_idx + 1..] {
+ // find out if and which field was set by this `consecutive_statement`
+ if let Some((field_ident, assign_rhs)) = field_reassigned_by_stmt(consecutive_statement, binding_name) {
+ // interrupt and cancel lint if assign_rhs references the original binding
++ if contains_name(binding_name, assign_rhs, cx) {
+ cancel_lint = true;
+ break;
+ }
+
+ // if the field was previously assigned, replace the assignment, otherwise insert the assignment
+ if let Some(prev) = assigned_fields
+ .iter_mut()
+ .find(|(field_name, _)| field_name == &field_ident.name)
+ {
+ *prev = (field_ident.name, assign_rhs);
+ } else {
+ assigned_fields.push((field_ident.name, assign_rhs));
+ }
+
+ // also set first instance of error for help message
+ if first_assign.is_none() {
+ first_assign = Some(consecutive_statement);
+ }
+ }
+ // interrupt if no field was assigned, since we only want to look at consecutive statements
+ else {
+ break;
+ }
+ }
+
+ // if there are incorrectly assigned fields, do a span_lint_and_note to suggest
+ // construction using `Ty { fields, ..Default::default() }`
+ if !assigned_fields.is_empty() && !cancel_lint {
+ // if all fields of the struct are not assigned, add `.. Default::default()` to the suggestion.
+ let ext_with_default = !variant
+ .fields
+ .iter()
+ .all(|field| assigned_fields.iter().any(|(a, _)| a == &field.name));
+
+ let field_list = assigned_fields
+ .into_iter()
+ .map(|(field, rhs)| {
+ // extract and store the assigned value for help message
+ let value_snippet = snippet_with_macro_callsite(cx, rhs.span, "..");
+ format!("{field}: {value_snippet}")
+ })
+ .collect::<Vec<String>>()
+ .join(", ");
+
+ // give correct suggestion if generics are involved (see #6944)
+ let binding_type = if_chain! {
+ if let ty::Adt(adt_def, substs) = binding_type.kind();
+ if !substs.is_empty();
+ then {
+ let adt_def_ty_name = cx.tcx.item_name(adt_def.did());
+ let generic_args = substs.iter().collect::<Vec<_>>();
+ let tys_str = generic_args
+ .iter()
+ .map(ToString::to_string)
+ .collect::<Vec<_>>()
+ .join(", ");
+ format!("{adt_def_ty_name}::<{}>", &tys_str)
+ } else {
+ binding_type.to_string()
+ }
+ };
+
+ let sugg = if ext_with_default {
+ if field_list.is_empty() {
+ format!("{binding_type}::default()")
+ } else {
+ format!("{binding_type} {{ {field_list}, ..Default::default() }}")
+ }
+ } else {
+ format!("{binding_type} {{ {field_list} }}")
+ };
+
+ // span lint once per statement that binds default
+ span_lint_and_note(
+ cx,
+ FIELD_REASSIGN_WITH_DEFAULT,
+ first_assign.unwrap().span,
+ "field assignment outside of initializer for an instance created with Default::default()",
+ Some(local.span),
+ &format!("consider initializing the variable with `{sugg}` and removing relevant reassignments"),
+ );
+ self.reassigned_linted.insert(span);
+ }
+ }
+ }
+}
+
+/// Checks if the given expression is the `default` method belonging to the `Default` trait.
+fn is_expr_default<'tcx>(expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> bool {
+ if_chain! {
+ if let ExprKind::Call(fn_expr, _) = &expr.kind;
+ if let ExprKind::Path(qpath) = &fn_expr.kind;
+ if let Res::Def(_, def_id) = cx.qpath_res(qpath, fn_expr.hir_id);
+ then {
+ // right hand side of assignment is `Default::default`
+ match_def_path(cx, def_id, &paths::DEFAULT_TRAIT_METHOD)
+ } else {
+ false
+ }
+ }
+}
+
+/// Returns the reassigned field and the assigning expression (right-hand side of assign).
+fn field_reassigned_by_stmt<'tcx>(this: &Stmt<'tcx>, binding_name: Symbol) -> Option<(Ident, &'tcx Expr<'tcx>)> {
+ if_chain! {
+ // only take assignments
+ if let StmtKind::Semi(later_expr) = this.kind;
+ if let ExprKind::Assign(assign_lhs, assign_rhs, _) = later_expr.kind;
+ // only take assignments to fields where the left-hand side field is a field of
+ // the same binding as the previous statement
+ if let ExprKind::Field(binding, field_ident) = assign_lhs.kind;
+ if let ExprKind::Path(QPath::Resolved(_, path)) = binding.kind;
+ if let Some(second_binding_name) = path.segments.last();
+ if second_binding_name.ident.name == binding_name;
+ then {
+ Some((field_ident, assign_rhs))
+ } else {
+ None
+ }
+ }
+}
+
+/// Returns whether `expr` is the update syntax base: `Foo { a: 1, .. base }`
+fn is_update_syntax_base<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+ if_chain! {
+ if let Some(parent) = get_parent_expr(cx, expr);
+ if let ExprKind::Struct(_, _, Some(base)) = parent.kind;
+ then {
+ base.hir_id == expr.hir_id
+ } else {
+ false
+ }
+ }
+}
--- /dev/null
- // If `place.local` were not included 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.at_most_borrowers(cx, &[local, place.local], place.local, location)
+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::Ref(_, ty) = &ty.kind else {
+ return Position::Other(precedence);
+ };
+ let mut ty = ty;
+
+ loop {
+ break match ty.ty.kind {
+ TyKind::Ref(_, 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
- def::{DefKind, Res},
- Body, Expr, ExprKind, GenericArg, Impl, ImplItemKind, Item, ItemKind, Node, PathSegment, QPath, TyKind,
+use clippy_utils::diagnostics::span_lint_and_then;
++use clippy_utils::msrvs::{self, Msrv};
++use clippy_utils::source::indent_of;
+use clippy_utils::{is_default_equivalent, peel_blocks};
+use rustc_errors::Applicability;
+use rustc_hir::{
- use rustc_session::{declare_lint_pass, declare_tool_lint};
++ def::{CtorKind, CtorOf, DefKind, Res},
++ Body, Expr, ExprKind, GenericArg, Impl, ImplItemKind, Item, ItemKind, Node, PathSegment, QPath, Ty, TyKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
- declare_lint_pass!(DerivableImpls => [DERIVABLE_IMPLS]);
++use rustc_middle::ty::{AdtDef, DefIdTree};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects manual `std::default::Default` implementations that are identical to a derived implementation.
+ ///
+ /// ### Why is this bad?
+ /// It is less concise.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Foo {
+ /// bar: bool
+ /// }
+ ///
+ /// impl Default for Foo {
+ /// fn default() -> Self {
+ /// Self {
+ /// bar: false
+ /// }
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// #[derive(Default)]
+ /// struct Foo {
+ /// bar: bool
+ /// }
+ /// ```
+ ///
+ /// ### Known problems
+ /// Derive macros [sometimes use incorrect bounds](https://github.com/rust-lang/rust/issues/26925)
+ /// in generic types and the user defined `impl` may be more generalized or
+ /// specialized than what derive will produce. This lint can't detect the manual `impl`
+ /// has exactly equal bounds, and therefore this lint is disabled for types with
+ /// generic parameters.
+ #[clippy::version = "1.57.0"]
+ pub DERIVABLE_IMPLS,
+ complexity,
+ "manual implementation of the `Default` trait which is equal to a derive"
+}
+
- if adt_def.is_struct();
- then {
- if let TyKind::Path(QPath::Resolved(_, p)) = self_ty.kind {
- if let Some(PathSegment { args: Some(a), .. }) = p.segments.last() {
- for arg in a.args {
- if !matches!(arg, GenericArg::Lifetime(_)) {
- return;
- }
- }
- }
- }
- let should_emit = match peel_blocks(func_expr).kind {
- ExprKind::Tup(fields) => fields.iter().all(|e| is_default_equivalent(cx, e)),
- ExprKind::Call(callee, args)
- if is_path_self(callee) => args.iter().all(|e| is_default_equivalent(cx, e)),
- ExprKind::Struct(_, fields, _) => fields.iter().all(|ef| is_default_equivalent(cx, ef.expr)),
- _ => false,
- };
++pub struct DerivableImpls {
++ msrv: Msrv,
++}
++
++impl DerivableImpls {
++ #[must_use]
++ pub fn new(msrv: Msrv) -> Self {
++ DerivableImpls { msrv }
++ }
++}
++
++impl_lint_pass!(DerivableImpls => [DERIVABLE_IMPLS]);
+
+fn is_path_self(e: &Expr<'_>) -> bool {
+ if let ExprKind::Path(QPath::Resolved(_, p)) = e.kind {
+ matches!(p.res, Res::SelfCtor(..) | Res::Def(DefKind::Ctor(..), _))
+ } else {
+ false
+ }
+}
+
++fn check_struct<'tcx>(
++ cx: &LateContext<'tcx>,
++ item: &'tcx Item<'_>,
++ self_ty: &Ty<'_>,
++ func_expr: &Expr<'_>,
++ adt_def: AdtDef<'_>,
++) {
++ if let TyKind::Path(QPath::Resolved(_, p)) = self_ty.kind {
++ if let Some(PathSegment { args: Some(a), .. }) = p.segments.last() {
++ for arg in a.args {
++ if !matches!(arg, GenericArg::Lifetime(_)) {
++ return;
++ }
++ }
++ }
++ }
++ let should_emit = match peel_blocks(func_expr).kind {
++ ExprKind::Tup(fields) => fields.iter().all(|e| is_default_equivalent(cx, e)),
++ ExprKind::Call(callee, args) if is_path_self(callee) => args.iter().all(|e| is_default_equivalent(cx, e)),
++ ExprKind::Struct(_, fields, _) => fields.iter().all(|ef| is_default_equivalent(cx, ef.expr)),
++ _ => false,
++ };
++
++ if should_emit {
++ let struct_span = cx.tcx.def_span(adt_def.did());
++ span_lint_and_then(cx, DERIVABLE_IMPLS, item.span, "this `impl` can be derived", |diag| {
++ diag.span_suggestion_hidden(
++ item.span,
++ "remove the manual implementation...",
++ String::new(),
++ Applicability::MachineApplicable,
++ );
++ diag.span_suggestion(
++ struct_span.shrink_to_lo(),
++ "...and instead derive it",
++ "#[derive(Default)]\n".to_string(),
++ Applicability::MachineApplicable,
++ );
++ });
++ }
++}
++
++fn check_enum<'tcx>(cx: &LateContext<'tcx>, item: &'tcx Item<'_>, func_expr: &Expr<'_>, adt_def: AdtDef<'_>) {
++ if_chain! {
++ if let ExprKind::Path(QPath::Resolved(None, p)) = &peel_blocks(func_expr).kind;
++ if let Res::Def(DefKind::Ctor(CtorOf::Variant, CtorKind::Const), id) = p.res;
++ if let variant_id = cx.tcx.parent(id);
++ if let Some(variant_def) = adt_def.variants().iter().find(|v| v.def_id == variant_id);
++ if variant_def.fields.is_empty();
++ if !variant_def.is_field_list_non_exhaustive();
++
++ then {
++ let enum_span = cx.tcx.def_span(adt_def.did());
++ let indent_enum = indent_of(cx, enum_span).unwrap_or(0);
++ let variant_span = cx.tcx.def_span(variant_def.def_id);
++ let indent_variant = indent_of(cx, variant_span).unwrap_or(0);
++ span_lint_and_then(
++ cx,
++ DERIVABLE_IMPLS,
++ item.span,
++ "this `impl` can be derived",
++ |diag| {
++ diag.span_suggestion_hidden(
++ item.span,
++ "remove the manual implementation...",
++ String::new(),
++ Applicability::MachineApplicable
++ );
++ diag.span_suggestion(
++ enum_span.shrink_to_lo(),
++ "...and instead derive it...",
++ format!(
++ "#[derive(Default)]\n{indent}",
++ indent = " ".repeat(indent_enum),
++ ),
++ Applicability::MachineApplicable
++ );
++ diag.span_suggestion(
++ variant_span.shrink_to_lo(),
++ "...and mark the default variant",
++ format!(
++ "#[default]\n{indent}",
++ indent = " ".repeat(indent_variant),
++ ),
++ Applicability::MachineApplicable
++ );
++ }
++ );
++ }
++ }
++}
++
+impl<'tcx> LateLintPass<'tcx> for DerivableImpls {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if_chain! {
+ if let ItemKind::Impl(Impl {
+ of_trait: Some(ref trait_ref),
+ items: [child],
+ self_ty,
+ ..
+ }) = item.kind;
+ if !cx.tcx.has_attr(item.owner_id.to_def_id(), sym::automatically_derived);
+ if !item.span.from_expansion();
+ if let Some(def_id) = trait_ref.trait_def_id();
+ if cx.tcx.is_diagnostic_item(sym::Default, def_id);
+ if let impl_item_hir = child.id.hir_id();
+ if let Some(Node::ImplItem(impl_item)) = cx.tcx.hir().find(impl_item_hir);
+ if let ImplItemKind::Fn(_, b) = &impl_item.kind;
+ if let Body { value: func_expr, .. } = cx.tcx.hir().body(*b);
+ if let Some(adt_def) = cx.tcx.type_of(item.owner_id).ty_adt_def();
+ if let attrs = cx.tcx.hir().attrs(item.hir_id());
+ if !attrs.iter().any(|attr| attr.doc_str().is_some());
+ if let child_attrs = cx.tcx.hir().attrs(impl_item_hir);
+ if !child_attrs.iter().any(|attr| attr.doc_str().is_some());
- if should_emit {
- let struct_span = cx.tcx.def_span(adt_def.did());
- span_lint_and_then(
- cx,
- DERIVABLE_IMPLS,
- item.span,
- "this `impl` can be derived",
- |diag| {
- diag.span_suggestion_hidden(
- item.span,
- "remove the manual implementation...",
- String::new(),
- Applicability::MachineApplicable
- );
- diag.span_suggestion(
- struct_span.shrink_to_lo(),
- "...and instead derive it",
- "#[derive(Default)]\n".to_string(),
- Applicability::MachineApplicable
- );
- }
- );
+
++ then {
++ if adt_def.is_struct() {
++ check_struct(cx, item, self_ty, func_expr, adt_def);
++ } else if adt_def.is_enum() && self.msrv.meets(msrvs::DEFAULT_ENUM_ATTRIBUTE) {
++ check_enum(cx, item, func_expr, adt_def);
+ }
+ }
+ }
+ }
++
++ extract_msrv_attr!(LateContext);
+}
--- /dev/null
- self, Binder, BoundConstness, Clause, GenericParamDefKind, ImplPolarity, ParamEnv, PredicateKind, TraitPredicate,
- Ty, TyCtxt,
+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::{
- pub DERIVE_HASH_XOR_EQ,
++ self, Binder, BoundConstness, Clause, GenericArgKind, 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"]
- DERIVE_HASH_XOR_EQ,
++ pub DERIVED_HASH_WITH_MANUAL_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,
- /// Implementation of the `DERIVE_HASH_XOR_EQ` lint.
++ DERIVED_HASH_WITH_MANUAL_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);
+ }
+ }
+ }
+}
+
- if peq_is_automatically_derived == hash_is_automatically_derived {
++/// Implementation of the `DERIVED_HASH_WITH_MANUAL_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);
+
- 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"
- };
-
++ if !hash_is_automatically_derived || peq_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 {
- DERIVE_HASH_XOR_EQ,
+ span_lint_and_then(
+ cx,
- mess,
++ DERIVED_HASH_WITH_MANUAL_EQ,
+ span,
++ "you are deriving `Hash` but have implemented `PartialEq` explicitly",
+ |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;
+ }
++ // `#[repr(packed)]` structs with type/const parameters can't derive `Clone`.
++ // https://github.com/rust-lang/rust-clippy/issues/10188
++ if ty_adt.repr().packed()
++ && ty_subs
++ .iter()
++ .any(|arg| matches!(arg.unpack(), GenericArgKind::Type(_) | GenericArgKind::Const(_)))
++ {
++ 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
- sym::mem_drop if arg_ty.is_ref() => (DROP_REF, DROP_REF_SUMMARY),
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_note};
+use clippy_utils::get_parent_node;
+use clippy_utils::is_must_use_func_call;
+use clippy_utils::ty::{is_copy, is_must_use_ty, is_type_lang_item};
+use rustc_hir::{Arm, Expr, ExprKind, LangItem, Node};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::drop` with a reference
+ /// instead of an owned value.
+ ///
+ /// ### Why is this bad?
+ /// Calling `drop` on a reference will only drop the
+ /// reference itself, which is a no-op. It will not call the `drop` method (from
+ /// the `Drop` trait implementation) on the underlying referenced value, which
+ /// is likely what was intended.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// let mut lock_guard = mutex.lock();
+ /// std::mem::drop(&lock_guard) // Should have been drop(lock_guard), mutex
+ /// // still locked
+ /// operation_that_requires_mutex_to_be_unlocked();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DROP_REF,
+ correctness,
+ "calls to `std::mem::drop` with a reference instead of an owned value"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::forget` with a reference
+ /// instead of an owned value.
+ ///
+ /// ### Why is this bad?
+ /// Calling `forget` on a reference will only forget the
+ /// reference itself, which is a no-op. It will not forget the underlying
+ /// referenced
+ /// value, which is likely what was intended.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Box::new(1);
+ /// std::mem::forget(&x) // Should have been forget(x), x will still be dropped
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FORGET_REF,
+ correctness,
+ "calls to `std::mem::forget` with a reference instead of an owned value"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::drop` with a value
+ /// that derives the Copy trait
+ ///
+ /// ### Why is this bad?
+ /// Calling `std::mem::drop` [does nothing for types that
+ /// implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html), since the
+ /// value will be copied and moved into the function on invocation.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: i32 = 42; // i32 implements Copy
+ /// std::mem::drop(x) // A copy of x is passed to the function, leaving the
+ /// // original unaffected
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DROP_COPY,
+ correctness,
+ "calls to `std::mem::drop` with a value that implements Copy"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::forget` with a value that
+ /// derives the Copy trait
+ ///
+ /// ### Why is this bad?
+ /// Calling `std::mem::forget` [does nothing for types that
+ /// implement Copy](https://doc.rust-lang.org/std/mem/fn.drop.html) since the
+ /// value will be copied and moved into the function on invocation.
+ ///
+ /// An alternative, but also valid, explanation is that Copy types do not
+ /// implement
+ /// the Drop trait, which means they have no destructors. Without a destructor,
+ /// there
+ /// is nothing for `std::mem::forget` to ignore.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: i32 = 42; // i32 implements Copy
+ /// std::mem::forget(x) // A copy of x is passed to the function, leaving the
+ /// // original unaffected
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FORGET_COPY,
+ correctness,
+ "calls to `std::mem::forget` with a value that implements Copy"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::drop` with a value that does not implement `Drop`.
+ ///
+ /// ### Why is this bad?
+ /// Calling `std::mem::drop` is no different than dropping such a type. A different value may
+ /// have been intended.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Foo;
+ /// let x = Foo;
+ /// std::mem::drop(x);
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub DROP_NON_DROP,
+ suspicious,
+ "call to `std::mem::drop` with a value which does not implement `Drop`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `std::mem::forget` with a value that does not implement `Drop`.
+ ///
+ /// ### Why is this bad?
+ /// Calling `std::mem::forget` is no different than dropping such a type. A different value may
+ /// have been intended.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Foo;
+ /// let x = Foo;
+ /// std::mem::forget(x);
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub FORGET_NON_DROP,
+ suspicious,
+ "call to `std::mem::forget` with a value which does not implement `Drop`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Prevents the safe `std::mem::drop` function from being called on `std::mem::ManuallyDrop`.
+ ///
+ /// ### Why is this bad?
+ /// The safe `drop` function does not drop the inner value of a `ManuallyDrop`.
+ ///
+ /// ### Known problems
+ /// Does not catch cases if the user binds `std::mem::drop`
+ /// to a different name and calls it that way.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct S;
+ /// drop(std::mem::ManuallyDrop::new(S));
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct S;
+ /// unsafe {
+ /// std::mem::ManuallyDrop::drop(&mut std::mem::ManuallyDrop::new(S));
+ /// }
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub UNDROPPED_MANUALLY_DROPS,
+ correctness,
+ "use of safe `std::mem::drop` function to drop a std::mem::ManuallyDrop, which will not drop the inner value"
+}
+
+const DROP_REF_SUMMARY: &str = "calls to `std::mem::drop` with a reference instead of an owned value. \
+ Dropping a reference does nothing";
+const FORGET_REF_SUMMARY: &str = "calls to `std::mem::forget` with a reference instead of an owned value. \
+ Forgetting a reference does nothing";
+const DROP_COPY_SUMMARY: &str = "calls to `std::mem::drop` with a value that implements `Copy`. \
+ Dropping a copy leaves the original intact";
+const FORGET_COPY_SUMMARY: &str = "calls to `std::mem::forget` with a value that implements `Copy`. \
+ Forgetting a copy leaves the original intact";
+const DROP_NON_DROP_SUMMARY: &str = "call to `std::mem::drop` with a value that does not implement `Drop`. \
+ Dropping such a type only extends its contained lifetimes";
+const FORGET_NON_DROP_SUMMARY: &str = "call to `std::mem::forget` with a value that does not implement `Drop`. \
+ Forgetting such a type is the same as dropping it";
+
+declare_lint_pass!(DropForgetRef => [
+ DROP_REF,
+ FORGET_REF,
+ DROP_COPY,
+ FORGET_COPY,
+ DROP_NON_DROP,
+ FORGET_NON_DROP,
+ UNDROPPED_MANUALLY_DROPS
+]);
+
+impl<'tcx> LateLintPass<'tcx> for DropForgetRef {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Call(path, [arg]) = expr.kind
+ && let ExprKind::Path(ref qpath) = path.kind
+ && let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id()
+ && let Some(fn_name) = cx.tcx.get_diagnostic_name(def_id)
+ {
+ let arg_ty = cx.typeck_results().expr_ty(arg);
+ let is_copy = is_copy(cx, arg_ty);
+ let drop_is_single_call_in_arm = is_single_call_in_arm(cx, arg, expr);
+ let (lint, msg) = match fn_name {
++ sym::mem_drop if arg_ty.is_ref() && !drop_is_single_call_in_arm => (DROP_REF, DROP_REF_SUMMARY),
+ sym::mem_forget if arg_ty.is_ref() => (FORGET_REF, FORGET_REF_SUMMARY),
+ sym::mem_drop if is_copy && !drop_is_single_call_in_arm => (DROP_COPY, DROP_COPY_SUMMARY),
+ sym::mem_forget if is_copy => (FORGET_COPY, FORGET_COPY_SUMMARY),
+ sym::mem_drop if is_type_lang_item(cx, arg_ty, LangItem::ManuallyDrop) => {
+ span_lint_and_help(
+ cx,
+ UNDROPPED_MANUALLY_DROPS,
+ expr.span,
+ "the inner value of this ManuallyDrop will not be dropped",
+ None,
+ "to drop a `ManuallyDrop<T>`, use std::mem::ManuallyDrop::drop",
+ );
+ return;
+ }
+ sym::mem_drop
+ if !(arg_ty.needs_drop(cx.tcx, cx.param_env)
+ || is_must_use_func_call(cx, arg)
+ || is_must_use_ty(cx, arg_ty)
+ || drop_is_single_call_in_arm
+ ) =>
+ {
+ (DROP_NON_DROP, DROP_NON_DROP_SUMMARY)
+ },
+ sym::mem_forget if !arg_ty.needs_drop(cx.tcx, cx.param_env) => {
+ (FORGET_NON_DROP, FORGET_NON_DROP_SUMMARY)
+ },
+ _ => return,
+ };
+ span_lint_and_note(
+ cx,
+ lint,
+ expr.span,
+ msg,
+ Some(arg.span),
+ &format!("argument has type `{arg_ty}`"),
+ );
+ }
+ }
+}
+
+// dropping returned value of a function like in the following snippet is considered idiomatic, see
+// #9482 for examples match <var> {
+// <pat> => drop(fn_with_side_effect_and_returning_some_value()),
+// ..
+// }
+fn is_single_call_in_arm<'tcx>(cx: &LateContext<'tcx>, arg: &'tcx Expr<'_>, drop_expr: &'tcx Expr<'_>) -> bool {
+ if matches!(arg.kind, ExprKind::Call(..) | ExprKind::MethodCall(..)) {
+ let parent_node = get_parent_node(cx.tcx, drop_expr.hir_id);
+ if let Some(Node::Arm(Arm { body, .. })) = &parent_node {
+ return body.hir_id == drop_expr.hir_id;
+ }
+ }
+ false
+}
--- /dev/null
- Applicability::MachineApplicable);
+use clippy_utils::{diagnostics::span_lint_and_then, source::snippet_opt};
+use rustc_ast::ast::{Item, ItemKind, VariantData};
+use rustc_errors::Applicability;
+use rustc_lexer::TokenKind;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds structs without fields (a so-called "empty struct") that are declared with brackets.
+ ///
+ /// ### Why is this bad?
+ /// Empty brackets after a struct declaration can be omitted.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Cookie {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct Cookie;
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub EMPTY_STRUCTS_WITH_BRACKETS,
+ restriction,
+ "finds struct declarations with empty brackets"
+}
+declare_lint_pass!(EmptyStructsWithBrackets => [EMPTY_STRUCTS_WITH_BRACKETS]);
+
+impl EarlyLintPass for EmptyStructsWithBrackets {
+ fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
+ let span_after_ident = item.span.with_lo(item.ident.span.hi());
+
+ if let ItemKind::Struct(var_data, _) = &item.kind
+ && has_brackets(var_data)
+ && has_no_fields(cx, var_data, span_after_ident) {
+ span_lint_and_then(
+ cx,
+ EMPTY_STRUCTS_WITH_BRACKETS,
+ span_after_ident,
+ "found empty brackets on struct declaration",
+ |diagnostic| {
+ diagnostic.span_suggestion_hidden(
+ span_after_ident,
+ "remove the brackets",
+ ";",
++ Applicability::Unspecified);
+ },
+ );
+ }
+ }
+}
+
+fn has_no_ident_token(braces_span_str: &str) -> bool {
+ !rustc_lexer::tokenize(braces_span_str).any(|t| t.kind == TokenKind::Ident)
+}
+
+fn has_brackets(var_data: &VariantData) -> bool {
+ !matches!(var_data, VariantData::Unit(_))
+}
+
+fn has_no_fields(cx: &EarlyContext<'_>, var_data: &VariantData, braces_span: Span) -> bool {
+ if !var_data.fields().is_empty() {
+ return false;
+ }
+
+ // there might still be field declarations hidden from the AST
+ // (conditionally compiled code using #[cfg(..)])
+
+ let Some(braces_span_str) = snippet_opt(cx, braces_span) else {
+ return false;
+ };
+
+ has_no_ident_token(braces_span_str.as_ref())
+}
+
+#[cfg(test)]
+mod unit_test {
+ use super::*;
+
+ #[test]
+ fn test_has_no_ident_token() {
+ let input = "{ field: u8 }";
+ assert!(!has_no_ident_token(input));
+
+ let input = "(u8, String);";
+ assert!(!has_no_ident_token(input));
+
+ let input = " {
+ // test = 5
+ }
+ ";
+ assert!(has_no_ident_token(input));
+
+ let input = " ();";
+ assert!(has_no_ident_token(input));
+ }
+}
--- /dev/null
- store.register_late_pass(|_| Box::new(derivable_impls::DerivableImpls));
+#![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`
+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 fn_null_check;
+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 permissions_set_readonly_false;
+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 size_of_ref;
+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(
+ 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::<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(move |_| Box::new(derivable_impls::DerivableImpls::new(msrv())));
+ store.register_late_pass(|_| Box::new(drop_forget_ref::DropForgetRef));
+ store.register_late_pass(|_| Box::new(empty_enum::EmptyEnum));
+ store.register_late_pass(|_| Box::new(invalid_upcast_comparisons::InvalidUpcastComparisons));
+ store.register_late_pass(|_| Box::new(regex::Regex));
+ store.register_late_pass(|_| Box::new(copies::CopyAndPaste));
+ store.register_late_pass(|_| Box::new(copy_iterator::CopyIterator));
+ store.register_late_pass(|_| Box::new(format::UselessFormat));
+ store.register_late_pass(|_| Box::new(swap::Swap));
+ store.register_late_pass(|_| Box::new(overflow_check_conditional::OverflowCheckConditional));
+ store.register_late_pass(|_| Box::<new_without_default::NewWithoutDefault>::default());
+ let disallowed_names = conf.disallowed_names.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move |_| Box::new(disallowed_names::DisallowedNames::new(disallowed_names.clone())));
+ let too_many_arguments_threshold = conf.too_many_arguments_threshold;
+ let too_many_lines_threshold = conf.too_many_lines_threshold;
+ let large_error_threshold = conf.large_error_threshold;
+ store.register_late_pass(move |_| {
+ Box::new(functions::Functions::new(
+ too_many_arguments_threshold,
+ too_many_lines_threshold,
+ large_error_threshold,
+ ))
+ });
+ let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move |_| Box::new(doc::DocMarkdown::new(doc_valid_idents.clone())));
+ store.register_late_pass(|_| Box::new(neg_multiply::NegMultiply));
+ store.register_late_pass(|_| Box::new(mem_forget::MemForget));
+ store.register_late_pass(|_| Box::new(let_if_seq::LetIfSeq));
+ store.register_late_pass(|_| Box::new(mixed_read_write_in_expression::EvalOrderDependence));
+ store.register_late_pass(|_| Box::new(missing_doc::MissingDoc::new()));
+ store.register_late_pass(|_| Box::new(missing_inline::MissingInline));
+ store.register_late_pass(move |_| Box::new(exhaustive_items::ExhaustiveItems));
+ store.register_late_pass(|_| Box::new(match_result_ok::MatchResultOk));
+ store.register_late_pass(|_| Box::new(partialeq_ne_impl::PartialEqNeImpl));
+ store.register_late_pass(|_| Box::new(unused_io_amount::UnusedIoAmount));
+ let enum_variant_size_threshold = conf.enum_variant_size_threshold;
+ store.register_late_pass(move |_| Box::new(large_enum_variant::LargeEnumVariant::new(enum_variant_size_threshold)));
+ store.register_late_pass(|_| Box::new(explicit_write::ExplicitWrite));
+ store.register_late_pass(|_| Box::new(needless_pass_by_value::NeedlessPassByValue));
+ let pass_by_ref_or_value = pass_by_ref_or_value::PassByRefOrValue::new(
+ conf.trivial_copy_size_limit,
+ conf.pass_by_value_size_limit,
+ conf.avoid_breaking_exported_api,
+ &sess.target,
+ );
+ store.register_late_pass(move |_| Box::new(pass_by_ref_or_value));
+ store.register_late_pass(|_| Box::new(ref_option_ref::RefOptionRef));
+ store.register_late_pass(|_| Box::new(infinite_iter::InfiniteIter));
+ store.register_late_pass(|_| Box::new(inline_fn_without_body::InlineFnWithoutBody));
+ store.register_late_pass(|_| Box::<useless_conversion::UselessConversion>::default());
+ store.register_late_pass(|_| Box::new(implicit_hasher::ImplicitHasher));
+ store.register_late_pass(|_| Box::new(fallible_impl_from::FallibleImplFrom));
+ store.register_late_pass(|_| Box::new(question_mark::QuestionMark));
+ store.register_early_pass(|| Box::new(suspicious_operation_groupings::SuspiciousOperationGroupings));
+ store.register_late_pass(|_| Box::new(suspicious_trait_impl::SuspiciousImpl));
+ store.register_late_pass(|_| Box::new(map_unit_fn::MapUnit));
+ store.register_late_pass(|_| Box::new(inherent_impl::MultipleInherentImpl));
+ store.register_late_pass(|_| Box::new(neg_cmp_op_on_partial_ord::NoNegCompOpForPartialOrd));
+ store.register_late_pass(|_| Box::new(unwrap::Unwrap));
+ store.register_late_pass(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));
+ store.register_late_pass(|_| Box::new(fn_null_check::FnNullCheck));
+ store.register_late_pass(|_| Box::new(permissions_set_readonly_false::PermissionsSetReadonlyFalse));
+ store.register_late_pass(|_| Box::new(size_of_ref::SizeOfRef));
+ // 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
- } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, start) {
+use super::NEEDLESS_RANGE_LOOP;
+use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
+use clippy_utils::source::snippet;
+use clippy_utils::ty::has_iter_method;
+use clippy_utils::visitors::is_local_used;
+use clippy_utils::{contains_name, higher, is_integer_const, sugg, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{BinOpKind, BorrowKind, Closure, Expr, ExprKind, HirId, Mutability, Pat, PatKind, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::middle::region;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::{sym, Symbol};
+use std::iter::{self, Iterator};
+use std::mem;
+
+/// Checks for looping over a range and then indexing a sequence with it.
+/// The iteratee must be a range literal.
+#[expect(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ arg: &'tcx Expr<'_>,
+ body: &'tcx Expr<'_>,
+ expr: &'tcx Expr<'_>,
+) {
+ if let Some(higher::Range {
+ start: Some(start),
+ ref end,
+ limits,
+ }) = higher::Range::hir(arg)
+ {
+ // the var must be a single name
+ if let PatKind::Binding(_, canonical_id, ident, _) = pat.kind {
+ let mut visitor = VarVisitor {
+ cx,
+ var: canonical_id,
+ indexed_mut: FxHashSet::default(),
+ indexed_indirectly: FxHashMap::default(),
+ indexed_directly: FxHashMap::default(),
+ referenced: FxHashSet::default(),
+ nonindex: false,
+ prefer_mutable: false,
+ };
+ walk_expr(&mut visitor, body);
+
+ // linting condition: we only indexed one variable, and indexed it directly
+ if visitor.indexed_indirectly.is_empty() && visitor.indexed_directly.len() == 1 {
+ let (indexed, (indexed_extent, indexed_ty)) = visitor
+ .indexed_directly
+ .into_iter()
+ .next()
+ .expect("already checked that we have exactly 1 element");
+
+ // ensure that the indexed variable was declared before the loop, see #601
+ if let Some(indexed_extent) = indexed_extent {
+ let parent_def_id = cx.tcx.hir().get_parent_item(expr.hir_id);
+ let region_scope_tree = cx.tcx.region_scope_tree(parent_def_id);
+ let pat_extent = region_scope_tree.var_scope(pat.hir_id.local_id).unwrap();
+ if region_scope_tree.is_subscope_of(indexed_extent, pat_extent) {
+ return;
+ }
+ }
+
+ // don't lint if the container that is indexed does not have .iter() method
+ let has_iter = has_iter_method(cx, indexed_ty);
+ if has_iter.is_none() {
+ return;
+ }
+
+ // don't lint if the container that is indexed into is also used without
+ // indexing
+ if visitor.referenced.contains(&indexed) {
+ return;
+ }
+
+ let starts_at_zero = is_integer_const(cx, start, 0);
+
+ let skip = if starts_at_zero {
+ String::new()
- } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, take_expr) {
++ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, start, cx) {
+ return;
+ } else {
+ format!(".skip({})", snippet(cx, start.span, ".."))
+ };
+
+ let mut end_is_start_plus_val = false;
+
+ let take = if let Some(end) = *end {
+ let mut take_expr = end;
+
+ if let ExprKind::Binary(ref op, left, right) = end.kind {
+ if op.node == BinOpKind::Add {
+ let start_equal_left = SpanlessEq::new(cx).eq_expr(start, left);
+ let start_equal_right = SpanlessEq::new(cx).eq_expr(start, right);
+
+ if start_equal_left {
+ take_expr = right;
+ } else if start_equal_right {
+ take_expr = left;
+ }
+
+ end_is_start_plus_val = start_equal_left | start_equal_right;
+ }
+ }
+
+ if is_len_call(end, indexed) || is_end_eq_array_len(cx, end, limits, indexed_ty) {
+ String::new()
++ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, take_expr, cx) {
+ return;
+ } else {
+ match limits {
+ ast::RangeLimits::Closed => {
+ let take_expr = sugg::Sugg::hir(cx, take_expr, "<count>");
+ format!(".take({})", take_expr + sugg::ONE)
+ },
+ ast::RangeLimits::HalfOpen => {
+ format!(".take({})", snippet(cx, take_expr.span, ".."))
+ },
+ }
+ }
+ } else {
+ String::new()
+ };
+
+ let (ref_mut, method) = if visitor.indexed_mut.contains(&indexed) {
+ ("mut ", "iter_mut")
+ } else {
+ ("", "iter")
+ };
+
+ let take_is_empty = take.is_empty();
+ let mut method_1 = take;
+ let mut method_2 = skip;
+
+ if end_is_start_plus_val {
+ mem::swap(&mut method_1, &mut method_2);
+ }
+
+ if visitor.nonindex {
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is used to index `{indexed}`", ident.name),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![
+ (pat.span, format!("({}, <item>)", ident.name)),
+ (
+ arg.span,
+ format!("{indexed}.{method}().enumerate(){method_1}{method_2}"),
+ ),
+ ],
+ );
+ },
+ );
+ } else {
+ let repl = if starts_at_zero && take_is_empty {
+ format!("&{ref_mut}{indexed}")
+ } else {
+ format!("{indexed}.{method}(){method_1}{method_2}")
+ };
+
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is only used to index `{indexed}`", ident.name),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![(pat.span, "<item>".to_string()), (arg.span, repl)],
+ );
+ },
+ );
+ }
+ }
+ }
+ }
+}
+
+fn is_len_call(expr: &Expr<'_>, var: Symbol) -> bool {
+ if_chain! {
+ if let ExprKind::MethodCall(method, recv, [], _) = expr.kind;
+ if method.ident.name == sym::len;
+ if let ExprKind::Path(QPath::Resolved(_, path)) = recv.kind;
+ if path.segments.len() == 1;
+ if path.segments[0].ident.name == var;
+ then {
+ return true;
+ }
+ }
+
+ false
+}
+
+fn is_end_eq_array_len<'tcx>(
+ cx: &LateContext<'tcx>,
+ end: &Expr<'_>,
+ limits: ast::RangeLimits,
+ indexed_ty: Ty<'tcx>,
+) -> bool {
+ if_chain! {
+ if let ExprKind::Lit(ref lit) = end.kind;
+ if let ast::LitKind::Int(end_int, _) = lit.node;
+ if let ty::Array(_, arr_len_const) = indexed_ty.kind();
+ if let Some(arr_len) = arr_len_const.try_eval_usize(cx.tcx, cx.param_env);
+ then {
+ return match limits {
+ ast::RangeLimits::Closed => end_int + 1 >= arr_len.into(),
+ ast::RangeLimits::HalfOpen => end_int >= arr_len.into(),
+ };
+ }
+ }
+
+ false
+}
+
+struct VarVisitor<'a, 'tcx> {
+ /// context reference
+ cx: &'a LateContext<'tcx>,
+ /// var name to look for as index
+ var: HirId,
+ /// indexed variables that are used mutably
+ indexed_mut: FxHashSet<Symbol>,
+ /// indirectly indexed variables (`v[(i + 4) % N]`), the extend is `None` for global
+ indexed_indirectly: FxHashMap<Symbol, Option<region::Scope>>,
+ /// subset of `indexed` of vars that are indexed directly: `v[i]`
+ /// this will not contain cases like `v[calc_index(i)]` or `v[(i + 4) % N]`
+ indexed_directly: FxHashMap<Symbol, (Option<region::Scope>, Ty<'tcx>)>,
+ /// Any names that are used outside an index operation.
+ /// Used to detect things like `&mut vec` used together with `vec[i]`
+ referenced: FxHashSet<Symbol>,
+ /// has the loop variable been used in expressions other than the index of
+ /// an index op?
+ nonindex: bool,
+ /// Whether we are inside the `$` in `&mut $` or `$ = foo` or `$.bar`, where bar
+ /// takes `&mut self`
+ prefer_mutable: bool,
+}
+
+impl<'a, 'tcx> VarVisitor<'a, 'tcx> {
+ fn check(&mut self, idx: &'tcx Expr<'_>, seqexpr: &'tcx Expr<'_>, expr: &'tcx Expr<'_>) -> bool {
+ if_chain! {
+ // the indexed container is referenced by a name
+ if let ExprKind::Path(ref seqpath) = seqexpr.kind;
+ if let QPath::Resolved(None, seqvar) = *seqpath;
+ if seqvar.segments.len() == 1;
+ if is_local_used(self.cx, idx, self.var);
+ then {
+ if self.prefer_mutable {
+ self.indexed_mut.insert(seqvar.segments[0].ident.name);
+ }
+ let index_used_directly = matches!(idx.kind, ExprKind::Path(_));
+ let res = self.cx.qpath_res(seqpath, seqexpr.hir_id);
+ match res {
+ Res::Local(hir_id) => {
+ let parent_def_id = self.cx.tcx.hir().get_parent_item(expr.hir_id);
+ let extent = self
+ .cx
+ .tcx
+ .region_scope_tree(parent_def_id)
+ .var_scope(hir_id.local_id)
+ .unwrap();
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (Some(extent), self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
+ self.indexed_indirectly
+ .insert(seqvar.segments[0].ident.name, Some(extent));
+ }
+ return false; // no need to walk further *on the variable*
+ },
+ Res::Def(DefKind::Static(_) | DefKind::Const, ..) => {
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (None, self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
+ self.indexed_indirectly.insert(seqvar.segments[0].ident.name, None);
+ }
+ return false; // no need to walk further *on the variable*
+ },
+ _ => (),
+ }
+ }
+ }
+ true
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ // a range index op
+ if let ExprKind::MethodCall(meth, args_0, [args_1, ..], _) = &expr.kind;
+ if let Some(trait_id) = self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .and_then(|def_id| self.cx.tcx.trait_of_item(def_id));
+ if (meth.ident.name == sym::index && self.cx.tcx.lang_items().index_trait() == Some(trait_id))
+ || (meth.ident.name == sym::index_mut && self.cx.tcx.lang_items().index_mut_trait() == Some(trait_id));
+ if !self.check(args_1, args_0, expr);
+ then {
+ return;
+ }
+ }
+
+ if_chain! {
+ // an index op
+ if let ExprKind::Index(seqexpr, idx) = expr.kind;
+ if !self.check(idx, seqexpr, expr);
+ then {
+ return;
+ }
+ }
+
+ if_chain! {
+ // directly using a variable
+ if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind;
+ if let Res::Local(local_id) = path.res;
+ then {
+ if local_id == self.var {
+ self.nonindex = true;
+ } else {
+ // not the correct variable, but still a variable
+ self.referenced.insert(path.segments[0].ident.name);
+ }
+ }
+ }
+
+ let old = self.prefer_mutable;
+ match expr.kind {
+ ExprKind::AssignOp(_, lhs, rhs) | ExprKind::Assign(lhs, rhs, _) => {
+ self.prefer_mutable = true;
+ self.visit_expr(lhs);
+ self.prefer_mutable = false;
+ self.visit_expr(rhs);
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutbl, expr) => {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ self.visit_expr(expr);
+ },
+ ExprKind::Call(f, args) => {
+ self.visit_expr(f);
+ for expr in args {
+ let ty = self.cx.typeck_results().expr_ty_adjusted(expr);
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ let def_id = self.cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
+ for (ty, expr) in iter::zip(
+ self.cx.tcx.fn_sig(def_id).inputs().skip_binder(),
+ std::iter::once(receiver).chain(args.iter()),
+ ) {
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::Closure(&Closure { body, .. }) => {
+ let body = self.cx.tcx.hir().body(body);
+ self.visit_expr(body.value);
+ },
+ _ => walk_expr(self, expr),
+ }
+ self.prefer_mutable = old;
+ }
+}
--- /dev/null
+use super::SINGLE_ELEMENT_LOOP;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{indent_of, snippet_with_applicability};
++use clippy_utils::visitors::contains_break_or_continue;
+use if_chain::if_chain;
+use rustc_ast::util::parser::PREC_PREFIX;
+use rustc_ast::Mutability;
+use rustc_errors::Applicability;
+use rustc_hir::{is_range_literal, BorrowKind, Expr, ExprKind, Pat};
+use rustc_lint::LateContext;
+use rustc_span::edition::Edition;
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ arg: &'tcx Expr<'_>,
+ body: &'tcx Expr<'_>,
+ expr: &'tcx Expr<'_>,
+) {
+ let (arg_expression, prefix) = match arg.kind {
+ ExprKind::AddrOf(
+ BorrowKind::Ref,
+ Mutability::Not,
+ Expr {
+ kind: ExprKind::Array([arg]),
+ ..
+ },
+ ) => (arg, "&"),
+ ExprKind::AddrOf(
+ BorrowKind::Ref,
+ Mutability::Mut,
+ Expr {
+ kind: ExprKind::Array([arg]),
+ ..
+ },
+ ) => (arg, "&mut "),
+ ExprKind::MethodCall(
+ method,
+ Expr {
+ kind: ExprKind::Array([arg]),
+ ..
+ },
+ [],
+ _,
+ ) if method.ident.name == rustc_span::sym::iter => (arg, "&"),
+ ExprKind::MethodCall(
+ method,
+ Expr {
+ kind: ExprKind::Array([arg]),
+ ..
+ },
+ [],
+ _,
+ ) if method.ident.name.as_str() == "iter_mut" => (arg, "&mut "),
+ ExprKind::MethodCall(
+ method,
+ Expr {
+ kind: ExprKind::Array([arg]),
+ ..
+ },
+ [],
+ _,
+ ) if method.ident.name == rustc_span::sym::into_iter => (arg, ""),
+ // Only check for arrays edition 2021 or later, as this case will trigger a compiler error otherwise.
+ ExprKind::Array([arg]) if cx.tcx.sess.edition() >= Edition::Edition2021 => (arg, ""),
+ _ => return,
+ };
+ if_chain! {
+ if let ExprKind::Block(block, _) = body.kind;
+ if !block.stmts.is_empty();
++ if !contains_break_or_continue(body);
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let pat_snip = snippet_with_applicability(cx, pat.span, "..", &mut applicability);
+ let mut arg_snip = snippet_with_applicability(cx, arg_expression.span, "..", &mut applicability);
+ let mut block_str = snippet_with_applicability(cx, block.span, "..", &mut applicability).into_owned();
+ block_str.remove(0);
+ block_str.pop();
+ let indent = " ".repeat(indent_of(cx, block.stmts[0].span).unwrap_or(0));
+
+ // Reference iterator from `&(mut) []` or `[].iter(_mut)()`.
+ if !prefix.is_empty() && (
+ // Precedence of internal expression is less than or equal to precedence of `&expr`.
+ arg_expression.precedence().order() <= PREC_PREFIX || is_range_literal(arg_expression)
+ ) {
+ arg_snip = format!("({arg_snip})").into();
+ }
+
+ span_lint_and_sugg(
+ cx,
+ SINGLE_ELEMENT_LOOP,
+ expr.span,
+ "for loop over a single element",
+ "try",
+ format!("{{\n{indent}let {pat_snip} = {prefix}{arg_snip};{block_str}}}"),
+ applicability,
+ )
+ }
+ }
+}
--- /dev/null
- use clippy_utils::diagnostics::span_lint_and_help;
++use clippy_utils::diagnostics::span_lint_and_then;
++use clippy_utils::source::snippet_opt;
++use clippy_utils::source::{indent_of, reindent_multiline};
+use clippy_utils::ty::is_type_lang_item;
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
++use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, LangItem};
+use rustc_lint::LateContext;
+use rustc_span::{source_map::Spanned, Span};
+
+use super::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS;
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ call_span: Span,
+ recv: &'tcx Expr<'_>,
+ arg: &'tcx Expr<'_>,
+) {
++ if let ExprKind::MethodCall(path_segment, ..) = recv.kind {
++ if matches!(
++ path_segment.ident.name.as_str(),
++ "to_lowercase" | "to_uppercase" | "to_ascii_lowercase" | "to_ascii_uppercase"
++ ) {
++ return;
++ }
++ }
++
+ if_chain! {
+ if let Some(method_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if let Some(impl_id) = cx.tcx.impl_of_method(method_id);
+ if cx.tcx.type_of(impl_id).is_str();
+ if let ExprKind::Lit(Spanned { node: LitKind::Str(ext_literal, ..), ..}) = arg.kind;
+ if (2..=6).contains(&ext_literal.as_str().len());
+ let ext_str = ext_literal.as_str();
+ if ext_str.starts_with('.');
+ if ext_str.chars().skip(1).all(|c| c.is_uppercase() || c.is_ascii_digit())
+ || ext_str.chars().skip(1).all(|c| c.is_lowercase() || c.is_ascii_digit());
+ let recv_ty = cx.typeck_results().expr_ty(recv).peel_refs();
+ if recv_ty.is_str() || is_type_lang_item(cx, recv_ty, LangItem::String);
+ then {
- span_lint_and_help(
++ span_lint_and_then(
+ cx,
+ CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
- call_span,
++ recv.span.to(call_span),
+ "case-sensitive file extension comparison",
- None,
- "consider using a case-insensitive comparison instead",
++ |diag| {
++ diag.help("consider using a case-insensitive comparison instead");
++ if let Some(mut recv_source) = snippet_opt(cx, recv.span) {
++
++ if !cx.typeck_results().expr_ty(recv).is_ref() {
++ recv_source = format!("&{recv_source}");
++ }
++
++ let suggestion_source = reindent_multiline(
++ format!(
++ "std::path::Path::new({})
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case(\"{}\"))",
++ recv_source, ext_str.strip_prefix('.').unwrap()).into(),
++ true,
++ Some(indent_of(cx, call_span).unwrap_or(0) + 4)
++ );
++
++ diag.span_suggestion(
++ recv.span.to(call_span),
++ "use std::path::Path",
++ suggestion_source,
++ Applicability::MaybeIncorrect,
++ );
++ }
++ }
+ );
+ }
+ }
+}
--- /dev/null
- use rustc_middle::ty::{self, adjustment::Adjust};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::get_parent_node;
+use clippy_utils::source::snippet_with_context;
+use clippy_utils::sugg;
+use clippy_utils::ty::is_copy;
+use rustc_errors::Applicability;
+use rustc_hir::{BindingAnnotation, ByRef, Expr, ExprKind, MatchSource, Node, PatKind, QPath};
+use rustc_lint::LateContext;
- &format!(
++use rustc_middle::ty::{self, adjustment::Adjust, print::with_forced_trimmed_paths};
+use rustc_span::symbol::{sym, Symbol};
+
+use super::CLONE_DOUBLE_REF;
+use super::CLONE_ON_COPY;
+
+/// Checks for the `CLONE_ON_COPY` lint.
+#[allow(clippy::too_many_lines)]
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ method_name: Symbol,
+ receiver: &Expr<'_>,
+ args: &[Expr<'_>],
+) {
+ let arg = if method_name == sym::clone && args.is_empty() {
+ receiver
+ } else {
+ return;
+ };
+ if cx
+ .typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .and_then(|id| cx.tcx.trait_of_item(id))
+ .zip(cx.tcx.lang_items().clone_trait())
+ .map_or(true, |(x, y)| x != y)
+ {
+ return;
+ }
+ let arg_adjustments = cx.typeck_results().expr_adjustments(arg);
+ let arg_ty = arg_adjustments
+ .last()
+ .map_or_else(|| cx.typeck_results().expr_ty(arg), |a| a.target);
+
+ let ty = cx.typeck_results().expr_ty(expr);
+ if let ty::Ref(_, inner, _) = arg_ty.kind() {
+ if let ty::Ref(_, innermost, _) = inner.kind() {
+ span_lint_and_then(
+ cx,
+ CLONE_DOUBLE_REF,
+ expr.span,
- ),
++ &with_forced_trimmed_paths!(format!(
+ "using `clone` on a double-reference; \
+ this will copy the reference of type `{ty}` instead of cloning the inner type"
- let explicit = format!("<{refs}{ty}>::clone({snip})");
++ )),
+ |diag| {
+ if let Some(snip) = sugg::Sugg::hir_opt(cx, arg) {
+ let mut ty = innermost;
+ let mut n = 0;
+ while let ty::Ref(_, inner, _) = ty.kind() {
+ ty = inner;
+ n += 1;
+ }
+ let refs = "&".repeat(n + 1);
+ let derefs = "*".repeat(n);
- format!("{refs}({derefs}{}).clone()", snip.deref()),
++ let explicit = with_forced_trimmed_paths!(format!("<{refs}{ty}>::clone({snip})"));
+ diag.span_suggestion(
+ expr.span,
+ "try dereferencing it",
- &format!("using `clone` on type `{ty}` which implements the `Copy` trait"),
++ with_forced_trimmed_paths!(format!("{refs}({derefs}{}).clone()", snip.deref())),
+ Applicability::MaybeIncorrect,
+ );
+ diag.span_suggestion(
+ expr.span,
+ "or try being explicit if you are sure, that you want to clone a reference",
+ explicit,
+ Applicability::MaybeIncorrect,
+ );
+ }
+ },
+ );
+ return; // don't report clone_on_copy
+ }
+ }
+
+ if is_copy(cx, ty) {
+ let parent_is_suffix_expr = match get_parent_node(cx.tcx, expr.hir_id) {
+ Some(Node::Expr(parent)) => match parent.kind {
+ // &*x is a nop, &x.clone() is not
+ ExprKind::AddrOf(..) => return,
+ // (*x).func() is useless, x.clone().func() can work in case func borrows self
+ ExprKind::MethodCall(_, self_arg, ..)
+ if expr.hir_id == self_arg.hir_id && ty != cx.typeck_results().expr_ty_adjusted(expr) =>
+ {
+ return;
+ },
+ // ? is a Call, makes sure not to rec *x?, but rather (*x)?
+ ExprKind::Call(hir_callee, _) => matches!(
+ hir_callee.kind,
+ ExprKind::Path(QPath::LangItem(rustc_hir::LangItem::TryTraitBranch, _, _))
+ ),
+ ExprKind::MethodCall(_, self_arg, ..) if expr.hir_id == self_arg.hir_id => true,
+ ExprKind::Match(_, _, MatchSource::TryDesugar | MatchSource::AwaitDesugar)
+ | ExprKind::Field(..)
+ | ExprKind::Index(..) => true,
+ _ => false,
+ },
+ // local binding capturing a reference
+ Some(Node::Local(l)) if matches!(l.pat.kind, PatKind::Binding(BindingAnnotation(ByRef::Yes, _), ..)) => {
+ return;
+ },
+ _ => false,
+ };
+
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, arg.span, expr.span.ctxt(), "_", &mut app).0;
+
+ let deref_count = arg_adjustments
+ .iter()
+ .take_while(|adj| matches!(adj.kind, Adjust::Deref(_)))
+ .count();
+ let (help, sugg) = if deref_count == 0 {
+ ("try removing the `clone` call", snip.into())
+ } else if parent_is_suffix_expr {
+ ("try dereferencing it", format!("({}{snip})", "*".repeat(deref_count)))
+ } else {
+ ("try dereferencing it", format!("{}{snip}", "*".repeat(deref_count)))
+ };
+
+ span_lint_and_sugg(
+ cx,
+ CLONE_ON_COPY,
+ expr.span,
++ &with_forced_trimmed_paths!(format!(
++ "using `clone` on type `{ty}` which implements the `Copy` trait"
++ )),
+ help,
+ sugg,
+ app,
+ );
+ }
+}
--- /dev/null
- if ident.name == method_name;
- if let hir::ExprKind::Path(path) = &receiver.kind;
- if let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id);
- then {
- return arg_id == *local
- }
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{indent_of, reindent_multiline, snippet};
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{is_trait_method, path_to_local_id, peel_blocks, SpanlessEq};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::def::Res;
+use rustc_hir::{Closure, Expr, ExprKind, PatKind, PathSegment, QPath, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_span::source_map::Span;
+use rustc_span::symbol::{sym, Symbol};
+use std::borrow::Cow;
+
+use super::MANUAL_FILTER_MAP;
+use super::MANUAL_FIND_MAP;
+use super::OPTION_FILTER_MAP;
+
+fn is_method(cx: &LateContext<'_>, expr: &hir::Expr<'_>, method_name: Symbol) -> bool {
+ match &expr.kind {
+ hir::ExprKind::Path(QPath::TypeRelative(_, mname)) => mname.ident.name == method_name,
+ hir::ExprKind::Path(QPath::Resolved(_, segments)) => {
+ segments.segments.last().unwrap().ident.name == method_name
+ },
+ hir::ExprKind::Closure(&hir::Closure { body, .. }) => {
+ let body = cx.tcx.hir().body(body);
+ let closure_expr = peel_blocks(body.value);
+ let arg_id = body.params[0].pat.hir_id;
+ match closure_expr.kind {
+ hir::ExprKind::MethodCall(hir::PathSegment { ident, .. }, receiver, ..) => {
+ if_chain! {
- if is_trait_method(cx, map_recv, sym::Iterator);
-
- // filter(|x| ...is_some())...
- if let ExprKind::Closure(&Closure { body: filter_body_id, .. }) = filter_arg.kind;
- let filter_body = cx.tcx.hir().body(filter_body_id);
- if let [filter_param] = filter_body.params;
- // optional ref pattern: `filter(|&x| ..)`
- let (filter_pat, is_filter_param_ref) = if let PatKind::Ref(ref_pat, _) = filter_param.pat.kind {
- (ref_pat, true)
- } else {
- (filter_param.pat, false)
++ if ident.name == method_name;
++ if let hir::ExprKind::Path(path) = &receiver.kind;
++ if let Res::Local(ref local) = cx.qpath_res(path, receiver.hir_id);
++ then {
++ return arg_id == *local
++ }
+ }
+ false
+ },
+ _ => false,
+ }
+ },
+ _ => false,
+ }
+}
+
+fn is_option_filter_map(cx: &LateContext<'_>, filter_arg: &hir::Expr<'_>, map_arg: &hir::Expr<'_>) -> bool {
+ is_method(cx, map_arg, sym::unwrap) && is_method(cx, filter_arg, sym!(is_some))
+}
+
+/// is `filter(|x| x.is_some()).map(|x| x.unwrap())`
+fn is_filter_some_map_unwrap(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ filter_recv: &hir::Expr<'_>,
+ filter_arg: &hir::Expr<'_>,
+ map_arg: &hir::Expr<'_>,
+) -> bool {
+ let iterator = is_trait_method(cx, expr, sym::Iterator);
+ let option = is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(filter_recv), sym::Option);
+
+ (iterator || option) && is_option_filter_map(cx, filter_arg, map_arg)
+}
+
+/// lint use of `filter().map()` or `find().map()` for `Iterators`
+#[allow(clippy::too_many_arguments)]
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ filter_recv: &hir::Expr<'_>,
+ filter_arg: &hir::Expr<'_>,
+ filter_span: Span,
+ map_recv: &hir::Expr<'_>,
+ map_arg: &hir::Expr<'_>,
+ map_span: Span,
+ is_find: bool,
+) {
+ if is_filter_some_map_unwrap(cx, expr, filter_recv, filter_arg, map_arg) {
+ span_lint_and_sugg(
+ cx,
+ OPTION_FILTER_MAP,
+ filter_span.with_hi(expr.span.hi()),
+ "`filter` for `Some` followed by `unwrap`",
+ "consider using `flatten` instead",
+ reindent_multiline(Cow::Borrowed("flatten()"), true, indent_of(cx, map_span)).into_owned(),
+ Applicability::MachineApplicable,
+ );
+
+ return;
+ }
+
+ if_chain! {
- // closure ends with is_some() or is_ok()
- if let PatKind::Binding(_, filter_param_id, _, None) = filter_pat.kind;
- if let ExprKind::MethodCall(path, filter_arg, [], _) = filter_body.value.kind;
- if let Some(opt_ty) = cx.typeck_results().expr_ty(filter_arg).peel_refs().ty_adt_def();
- if let Some(is_result) = if cx.tcx.is_diagnostic_item(sym::Option, opt_ty.did()) {
- Some(false)
- } else if cx.tcx.is_diagnostic_item(sym::Result, opt_ty.did()) {
- Some(true)
++ if is_trait_method(cx, map_recv, sym::Iterator);
++
++ // filter(|x| ...is_some())...
++ if let ExprKind::Closure(&Closure { body: filter_body_id, .. }) = filter_arg.kind;
++ let filter_body = cx.tcx.hir().body(filter_body_id);
++ if let [filter_param] = filter_body.params;
++ // optional ref pattern: `filter(|&x| ..)`
++ let (filter_pat, is_filter_param_ref) = if let PatKind::Ref(ref_pat, _) = filter_param.pat.kind {
++ (ref_pat, true)
++ } else {
++ (filter_param.pat, false)
++ };
++ // closure ends with is_some() or is_ok()
++ if let PatKind::Binding(_, filter_param_id, _, None) = filter_pat.kind;
++ if let ExprKind::MethodCall(path, filter_arg, [], _) = filter_body.value.kind;
++ if let Some(opt_ty) = cx.typeck_results().expr_ty(filter_arg).peel_refs().ty_adt_def();
++ if let Some(is_result) = if cx.tcx.is_diagnostic_item(sym::Option, opt_ty.did()) {
++ Some(false)
++ } else if cx.tcx.is_diagnostic_item(sym::Result, opt_ty.did()) {
++ Some(true)
++ } else {
++ None
++ };
++ if path.ident.name.as_str() == if is_result { "is_ok" } else { "is_some" };
++
++ // ...map(|x| ...unwrap())
++ if let ExprKind::Closure(&Closure { body: map_body_id, .. }) = map_arg.kind;
++ let map_body = cx.tcx.hir().body(map_body_id);
++ if let [map_param] = map_body.params;
++ if let PatKind::Binding(_, map_param_id, map_param_ident, None) = map_param.pat.kind;
++ // closure ends with expect() or unwrap()
++ if let ExprKind::MethodCall(seg, map_arg, ..) = map_body.value.kind;
++ if matches!(seg.ident.name, sym::expect | sym::unwrap | sym::unwrap_or);
++
++ // .filter(..).map(|y| f(y).copied().unwrap())
++ // ~~~~
++ let map_arg_peeled = match map_arg.kind {
++ ExprKind::MethodCall(method, original_arg, [], _) if acceptable_methods(method) => {
++ original_arg
++ },
++ _ => map_arg,
++ };
++
++ // .filter(|x| x.is_some()).map(|y| y[.acceptable_method()].unwrap())
++ let simple_equal = path_to_local_id(filter_arg, filter_param_id)
++ && path_to_local_id(map_arg_peeled, map_param_id);
++
++ let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
++ // in `filter(|x| ..)`, replace `*x` with `x`
++ let a_path = if_chain! {
++ if !is_filter_param_ref;
++ if let ExprKind::Unary(UnOp::Deref, expr_path) = a.kind;
++ then { expr_path } else { a }
+ };
- None
- };
- if path.ident.name.as_str() == if is_result { "is_ok" } else { "is_some" };
-
- // ...map(|x| ...unwrap())
- if let ExprKind::Closure(&Closure { body: map_body_id, .. }) = map_arg.kind;
- let map_body = cx.tcx.hir().body(map_body_id);
- if let [map_param] = map_body.params;
- if let PatKind::Binding(_, map_param_id, map_param_ident, None) = map_param.pat.kind;
- // closure ends with expect() or unwrap()
- if let ExprKind::MethodCall(seg, map_arg, ..) = map_body.value.kind;
- if matches!(seg.ident.name, sym::expect | sym::unwrap | sym::unwrap_or);
-
- // .filter(..).map(|y| f(y).copied().unwrap())
- // ~~~~
- let map_arg_peeled = match map_arg.kind {
- ExprKind::MethodCall(method, original_arg, [], _) if acceptable_methods(method) => {
- original_arg
- },
- _ => map_arg,
++ // let the filter closure arg and the map closure arg be equal
++ path_to_local_id(a_path, filter_param_id)
++ && path_to_local_id(b, map_param_id)
++ && cx.typeck_results().expr_ty_adjusted(a) == cx.typeck_results().expr_ty_adjusted(b)
++ };
++
++ if simple_equal || SpanlessEq::new(cx).expr_fallback(eq_fallback).eq_expr(filter_arg, map_arg_peeled);
++ then {
++ let span = filter_span.with_hi(expr.span.hi());
++ let (filter_name, lint) = if is_find {
++ ("find", MANUAL_FIND_MAP)
+ } else {
- // .filter(|x| x.is_some()).map(|y| y[.acceptable_method()].unwrap())
- let simple_equal = path_to_local_id(filter_arg, filter_param_id)
- && path_to_local_id(map_arg_peeled, map_param_id);
-
- let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
- // in `filter(|x| ..)`, replace `*x` with `x`
- let a_path = if_chain! {
- if !is_filter_param_ref;
- if let ExprKind::Unary(UnOp::Deref, expr_path) = a.kind;
- then { expr_path } else { a }
- };
- // let the filter closure arg and the map closure arg be equal
- path_to_local_id(a_path, filter_param_id)
- && path_to_local_id(b, map_param_id)
- && cx.typeck_results().expr_ty_adjusted(a) == cx.typeck_results().expr_ty_adjusted(b)
++ ("filter", MANUAL_FILTER_MAP)
+ };
++ let msg = format!("`{filter_name}(..).map(..)` can be simplified as `{filter_name}_map(..)`");
++ let (to_opt, deref) = if is_result {
++ (".ok()", String::new())
++ } else {
++ let derefs = cx.typeck_results()
++ .expr_adjustments(map_arg)
++ .iter()
++ .filter(|adj| matches!(adj.kind, Adjust::Deref(_)))
++ .count();
+
-
- if simple_equal || SpanlessEq::new(cx).expr_fallback(eq_fallback).eq_expr(filter_arg, map_arg_peeled);
- then {
- let span = filter_span.with_hi(expr.span.hi());
- let (filter_name, lint) = if is_find {
- ("find", MANUAL_FIND_MAP)
- } else {
- ("filter", MANUAL_FILTER_MAP)
- };
- let msg = format!("`{filter_name}(..).map(..)` can be simplified as `{filter_name}_map(..)`");
- let (to_opt, deref) = if is_result {
- (".ok()", String::new())
- } else {
- let derefs = cx.typeck_results()
- .expr_adjustments(map_arg)
- .iter()
- .filter(|adj| matches!(adj.kind, Adjust::Deref(_)))
- .count();
-
- ("", "*".repeat(derefs))
- };
- let sugg = format!(
- "{filter_name}_map(|{map_param_ident}| {deref}{}{to_opt})",
- snippet(cx, map_arg.span, ".."),
- );
- span_lint_and_sugg(cx, lint, span, &msg, "try", sugg, Applicability::MachineApplicable);
- }
++ ("", "*".repeat(derefs))
+ };
++ let sugg = format!(
++ "{filter_name}_map(|{map_param_ident}| {deref}{}{to_opt})",
++ snippet(cx, map_arg.span, ".."),
++ );
++ span_lint_and_sugg(cx, lint, span, &msg, "try", sugg, Applicability::MachineApplicable);
++ }
+ }
+}
+
+fn acceptable_methods(method: &PathSegment<'_>) -> bool {
+ let methods: [Symbol; 8] = [
+ sym::clone,
+ sym::as_ref,
+ sym!(copied),
+ sym!(cloned),
+ sym!(as_deref),
+ sym!(as_mut),
+ sym!(as_deref_mut),
+ sym!(to_owned),
+ ];
+
+ methods.contains(&method.ident.name)
+}
--- /dev/null
- use rustc_hir::{BindingAnnotation, Body, BorrowKind, Expr, ExprKind, Mutability, Pat, PatKind};
+#![allow(unused_imports)]
+
+use super::ITER_KV_MAP;
+use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::sugg;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::visitors::is_local_used;
- let (replacement_kind, binded_ident) = match (&key_pat.kind, &val_pat.kind) {
- (key, PatKind::Binding(_, _, value, _)) if pat_is_wild(cx, key, m_arg) => ("value", value),
- (PatKind::Binding(_, _, key, _), value) if pat_is_wild(cx, value, m_arg) => ("key", key),
++use rustc_hir::{BindingAnnotation, Body, BorrowKind, ByRef, Expr, ExprKind, Mutability, Pat, PatKind};
+use rustc_lint::{LateContext, LintContext};
+use rustc_middle::ty;
+use rustc_span::sym;
+use rustc_span::Span;
+
+/// lint use of:
+/// - `hashmap.iter().map(|(_, v)| v)`
+/// - `hashmap.into_iter().map(|(_, v)| v)`
+/// on `HashMaps` and `BTreeMaps` in std
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ map_type: &'tcx str, // iter / into_iter
+ expr: &'tcx Expr<'tcx>, // .iter().map(|(_, v_| v))
+ recv: &'tcx Expr<'tcx>, // hashmap
+ m_arg: &'tcx Expr<'tcx>, // |(_, v)| v
+) {
+ if_chain! {
+ if !expr.span.from_expansion();
+ if let ExprKind::Closure(c) = m_arg.kind;
+ if let Body {params: [p], value: body_expr, generator_kind: _ } = cx.tcx.hir().body(c.body);
+ if let PatKind::Tuple([key_pat, val_pat], _) = p.pat.kind;
+
- if local_ident.ident.as_str() == binded_ident.as_str();
++ let (replacement_kind, annotation, bound_ident) = match (&key_pat.kind, &val_pat.kind) {
++ (key, PatKind::Binding(ann, _, value, _)) if pat_is_wild(cx, key, m_arg) => ("value", ann, value),
++ (PatKind::Binding(ann, _, key, _), value) if pat_is_wild(cx, value, m_arg) => ("key", ann, key),
+ _ => return,
+ };
+
+ let ty = cx.typeck_results().expr_ty(recv);
+ if is_type_diagnostic_item(cx, ty, sym::HashMap) || is_type_diagnostic_item(cx, ty, sym::BTreeMap);
+
+ then {
+ let mut applicability = rustc_errors::Applicability::MachineApplicable;
+ let recv_snippet = snippet_with_applicability(cx, recv.span, "map", &mut applicability);
+ let into_prefix = if map_type == "into_iter" {"into_"} else {""};
+
+ if_chain! {
+ if let ExprKind::Path(rustc_hir::QPath::Resolved(_, path)) = body_expr.kind;
+ if let [local_ident] = path.segments;
- format!("{recv_snippet}.{into_prefix}{replacement_kind}s().map(|{binded_ident}| {})",
++ if local_ident.ident.as_str() == bound_ident.as_str();
+
+ then {
+ span_lint_and_sugg(
+ cx,
+ ITER_KV_MAP,
+ expr.span,
+ &format!("iterating on a map's {replacement_kind}s"),
+ "try",
+ format!("{recv_snippet}.{into_prefix}{replacement_kind}s()"),
+ applicability,
+ );
+ } else {
++ let ref_annotation = if annotation.0 == ByRef::Yes {
++ "ref "
++ } else {
++ ""
++ };
++ let mut_annotation = if annotation.1 == Mutability::Mut {
++ "mut "
++ } else {
++ ""
++ };
+ span_lint_and_sugg(
+ cx,
+ ITER_KV_MAP,
+ expr.span,
+ &format!("iterating on a map's {replacement_kind}s"),
+ "try",
++ format!("{recv_snippet}.{into_prefix}{replacement_kind}s().map(|{ref_annotation}{mut_annotation}{bound_ident}| {})",
+ snippet_with_applicability(cx, body_expr.span, "/* body */", &mut applicability)),
+ applicability,
+ );
+ }
+ }
+ }
+ }
+}
+
+/// Returns `true` if the pattern is a `PatWild`, or is an ident prefixed with `_`
+/// that is not locally used.
+fn pat_is_wild<'tcx>(cx: &LateContext<'tcx>, pat: &'tcx PatKind<'_>, body: &'tcx Expr<'_>) -> bool {
+ match *pat {
+ PatKind::Wild => true,
+ PatKind::Binding(_, id, ident, None) if ident.as_str().starts_with('_') => !is_local_used(cx, body, id),
+ _ => false,
+ }
+}
--- /dev/null
- use rustc_middle::ty;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_diag_trait_item;
+use clippy_utils::source::snippet_with_context;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
- &format!("this `to_owned` call clones the {input_type} itself and does not cause the {input_type} contents to become owned"),
++use rustc_middle::ty::{self, print::with_forced_trimmed_paths};
+use rustc_span::sym;
+
+use super::SUSPICIOUS_TO_OWNED;
+
+pub fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>) -> bool {
+ if_chain! {
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if is_diag_trait_item(cx, method_def_id, sym::ToOwned);
+ let input_type = cx.typeck_results().expr_ty(expr);
+ if let ty::Adt(adt, _) = cx.typeck_results().expr_ty(expr).kind();
+ if cx.tcx.is_diagnostic_item(sym::Cow, adt.did());
+ then {
+ let mut app = Applicability::MaybeIncorrect;
+ let recv_snip = snippet_with_context(cx, recv.span, expr.span.ctxt(), "..", &mut app).0;
+ span_lint_and_sugg(
+ cx,
+ SUSPICIOUS_TO_OWNED,
+ expr.span,
++ &with_forced_trimmed_paths!(format!(
++ "this `to_owned` call clones the {input_type} itself and does not cause the {input_type} contents to become owned"
++ )),
+ "consider using, depending on intent",
+ format!("{recv_snip}.clone()` or `{recv_snip}.into_owned()"),
+ app,
+ );
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
- //! This lint is **warn** by default
+//! Checks for uses of mutex where an atomic value could be used
+//!
- nursery,
- "using a mutex where an atomic value could be used instead"
++//! This lint is **allow** by default
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::is_type_diagnostic_item;
+use rustc_hir::Expr;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Mutex<X>` where an atomic will do.
+ ///
+ /// ### Why is this bad?
+ /// Using a mutex just to make access to a plain bool or
+ /// reference sequential is shooting flies with cannons.
+ /// `std::sync::atomic::AtomicBool` and `std::sync::atomic::AtomicPtr` are leaner and
+ /// faster.
+ ///
++ /// On the other hand, `Mutex`es are, in general, easier to
++ /// verify correctness. An atomic does not behave the same as
++ /// an equivalent mutex. See [this issue](https://github.com/rust-lang/rust-clippy/issues/4295)'s commentary for more details.
++ ///
+ /// ### Known problems
+ /// This lint cannot detect if the mutex is actually used
+ /// for waiting before a critical section.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let y = true;
+ /// # use std::sync::Mutex;
+ /// let x = Mutex::new(&y);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let y = true;
+ /// # use std::sync::atomic::AtomicBool;
+ /// let x = AtomicBool::new(y);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MUTEX_ATOMIC,
++ restriction,
++ "using a mutex where an atomic value could be used instead."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Mutex<X>` where `X` is an integral
+ /// type.
+ ///
+ /// ### Why is this bad?
+ /// Using a mutex just to make access to a plain integer
+ /// sequential is
+ /// shooting flies with cannons. `std::sync::atomic::AtomicUsize` is leaner and faster.
+ ///
+ /// ### Known problems
+ /// This lint cannot detect if the mutex is actually used
+ /// for waiting before a critical section.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::sync::Mutex;
+ /// let x = Mutex::new(0usize);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::atomic::AtomicUsize;
+ /// let x = AtomicUsize::new(0usize);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MUTEX_INTEGER,
+ nursery,
+ "using a mutex for an integer type"
+}
+
+declare_lint_pass!(Mutex => [MUTEX_ATOMIC, MUTEX_INTEGER]);
+
+impl<'tcx> LateLintPass<'tcx> for Mutex {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ let ty = cx.typeck_results().expr_ty(expr);
+ if let ty::Adt(_, subst) = ty.kind() {
+ if is_type_diagnostic_item(cx, ty, sym::Mutex) {
+ let mutex_param = subst.type_at(0);
+ if let Some(atomic_name) = get_atomic_name(mutex_param) {
+ let msg = format!(
+ "consider using an `{atomic_name}` instead of a `Mutex` here; if you just want the locking \
+ behavior and not the internal type, consider using `Mutex<()>`"
+ );
+ match *mutex_param.kind() {
+ ty::Uint(t) if t != ty::UintTy::Usize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
+ ty::Int(t) if t != ty::IntTy::Isize => span_lint(cx, MUTEX_INTEGER, expr.span, &msg),
+ _ => span_lint(cx, MUTEX_ATOMIC, expr.span, &msg),
+ };
+ }
+ }
+ }
+ }
+}
+
+fn get_atomic_name(ty: Ty<'_>) -> Option<&'static str> {
+ match ty.kind() {
+ ty::Bool => Some("AtomicBool"),
+ ty::Uint(_) => Some("AtomicUsize"),
+ ty::Int(_) => Some("AtomicIsize"),
+ ty::RawPtr(_) => Some("AtomicPtr"),
+ _ => None,
+ }
+}
--- /dev/null
- peel_hir_expr_refs,
+use super::ARITHMETIC_SIDE_EFFECTS;
+use clippy_utils::{
+ consts::{constant, constant_simple},
+ diagnostics::span_lint,
- if let hir::ExprKind::Lit(ref lit) = expr.kind && let ast::LitKind::Int(n, _) = lit.node {
++ peel_hir_expr_refs, peel_hir_expr_unary,
+};
+use rustc_ast as ast;
+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};
+
+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 {
+ 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]
+ 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 {
+ allowed_binary,
+ allowed_unary,
+ const_span: None,
+ expr_span: None,
+ }
+ }
+
+ /// 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`.
++ ///
++ /// Returns the absolute value of the expression, if this is an integer literal.
+ fn literal_integer(expr: &hir::Expr<'_>) -> Option<u128> {
- | hir::BinOpKind::Sub
- | hir::BinOpKind::Mul
++ let actual = peel_hir_expr_unary(expr).0;
++ if let hir::ExprKind::Lit(ref lit) = actual.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::Div
++ | hir::BinOpKind::Mul
+ | hir::BinOpKind::Rem
+ | hir::BinOpKind::Shl
+ | hir::BinOpKind::Shr
++ | hir::BinOpKind::Sub
+ ) {
+ return;
+ };
+ let lhs_ty = cx.typeck_results().expr_ty(lhs);
+ let rhs_ty = cx.typeck_results().expr_ty(rhs);
+ 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
- /// are constant and `x` is greater or equal to `y`.
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::higher;
+use clippy_utils::msrvs::{self, Msrv};
+use clippy_utils::source::{snippet, snippet_opt, snippet_with_applicability};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::{get_parent_expr, in_constant, is_integer_const, path_to_local};
+use if_chain::if_chain;
+use rustc_ast::ast::RangeLimits;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, HirId};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::{Span, Spanned};
+use std::cmp::Ordering;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for exclusive ranges where 1 is added to the
+ /// upper bound, e.g., `x..(y+1)`.
+ ///
+ /// ### Why is this bad?
+ /// The code is more readable with an inclusive range
+ /// like `x..=y`.
+ ///
+ /// ### Known problems
+ /// Will add unnecessary pair of parentheses when the
+ /// expression is not wrapped in a pair but starts with an opening parenthesis
+ /// and ends with a closing one.
+ /// I.e., `let _ = (f()+1)..(f()+1)` results in `let _ = ((f()+1)..=f())`.
+ ///
+ /// Also in many cases, inclusive ranges are still slower to run than
+ /// exclusive ranges, because they essentially add an extra branch that
+ /// LLVM may fail to hoist out of the loop.
+ ///
+ /// This will cause a warning that cannot be fixed if the consumer of the
+ /// range only accepts a specific range type, instead of the generic
+ /// `RangeBounds` trait
+ /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..(y+1) {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..=y {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_PLUS_ONE,
+ pedantic,
+ "`x..(y+1)` reads better as `x..=y`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for inclusive ranges where 1 is subtracted from
+ /// the upper bound, e.g., `x..=(y-1)`.
+ ///
+ /// ### Why is this bad?
+ /// The code is more readable with an exclusive range
+ /// like `x..y`.
+ ///
+ /// ### Known problems
+ /// This will cause a warning that cannot be fixed if
+ /// the consumer of the range only accepts a specific range type, instead of
+ /// the generic `RangeBounds` trait
+ /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..=(y-1) {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..y {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_MINUS_ONE,
+ pedantic,
+ "`x..=(y-1)` reads better as `x..y`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for range expressions `x..y` where both `x` and `y`
++ /// are constant and `x` is greater to `y`. Also triggers if `x` is equal to `y` when they are conditions to a `for` loop.
+ ///
+ /// ### Why is this bad?
+ /// Empty ranges yield no values so iterating them is a no-op.
+ /// Moreover, trying to use a reversed range to index a slice will panic at run-time.
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// fn main() {
+ /// (10..=0).for_each(|x| println!("{}", x));
+ ///
+ /// let arr = [1, 2, 3, 4, 5];
+ /// let sub = &arr[3..1];
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// (0..=10).rev().for_each(|x| println!("{}", x));
+ ///
+ /// let arr = [1, 2, 3, 4, 5];
+ /// let sub = &arr[1..3];
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub REVERSED_EMPTY_RANGES,
+ correctness,
+ "reversing the limits of range expressions, resulting in empty ranges"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for expressions like `x >= 3 && x < 8` that could
+ /// be more readably expressed as `(3..8).contains(x)`.
+ ///
+ /// ### Why is this bad?
+ /// `contains` expresses the intent better and has less
+ /// failure modes (such as fencepost errors or using `||` instead of `&&`).
+ ///
+ /// ### Example
+ /// ```rust
+ /// // given
+ /// let x = 6;
+ ///
+ /// assert!(x >= 3 && x < 8);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ ///# let x = 6;
+ /// assert!((3..8).contains(&x));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_RANGE_CONTAINS,
+ style,
+ "manually reimplementing {`Range`, `RangeInclusive`}`::contains`"
+}
+
+pub struct Ranges {
+ msrv: Msrv,
+}
+
+impl Ranges {
+ #[must_use]
+ pub fn new(msrv: Msrv) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(Ranges => [
+ RANGE_PLUS_ONE,
+ RANGE_MINUS_ONE,
+ REVERSED_EMPTY_RANGES,
+ MANUAL_RANGE_CONTAINS,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Ranges {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Binary(ref op, l, r) = expr.kind {
+ if self.msrv.meets(msrvs::RANGE_CONTAINS) {
+ check_possible_range_contains(cx, op.node, l, r, expr, expr.span);
+ }
+ }
+
+ check_exclusive_range_plus_one(cx, expr);
+ check_inclusive_range_minus_one(cx, expr);
+ check_reversed_empty_range(cx, expr);
+ }
+ extract_msrv_attr!(LateContext);
+}
+
+fn check_possible_range_contains(
+ cx: &LateContext<'_>,
+ op: BinOpKind,
+ left: &Expr<'_>,
+ right: &Expr<'_>,
+ expr: &Expr<'_>,
+ span: Span,
+) {
+ if in_constant(cx, expr.hir_id) {
+ return;
+ }
+
+ let combine_and = match op {
+ BinOpKind::And | BinOpKind::BitAnd => true,
+ BinOpKind::Or | BinOpKind::BitOr => false,
+ _ => return,
+ };
+ // value, name, order (higher/lower), inclusiveness
+ if let (Some(l), Some(r)) = (check_range_bounds(cx, left), check_range_bounds(cx, right)) {
+ // we only lint comparisons on the same name and with different
+ // direction
+ if l.id != r.id || l.ord == r.ord {
+ return;
+ }
+ let ord = Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(l.expr), &l.val, &r.val);
+ if combine_and && ord == Some(r.ord) {
+ // order lower bound and upper bound
+ let (l_span, u_span, l_inc, u_inc) = if r.ord == Ordering::Less {
+ (l.val_span, r.val_span, l.inc, r.inc)
+ } else {
+ (r.val_span, l.val_span, r.inc, l.inc)
+ };
+ // we only lint inclusive lower bounds
+ if !l_inc {
+ return;
+ }
+ let (range_type, range_op) = if u_inc {
+ ("RangeInclusive", "..=")
+ } else {
+ ("Range", "..")
+ };
+ let mut applicability = Applicability::MachineApplicable;
+ let name = snippet_with_applicability(cx, l.name_span, "_", &mut applicability);
+ let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
+ let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+ let space = if lo.ends_with('.') { " " } else { "" };
+ span_lint_and_sugg(
+ cx,
+ MANUAL_RANGE_CONTAINS,
+ span,
+ &format!("manual `{range_type}::contains` implementation"),
+ "use",
+ format!("({lo}{space}{range_op}{hi}).contains(&{name})"),
+ applicability,
+ );
+ } else if !combine_and && ord == Some(l.ord) {
+ // `!_.contains(_)`
+ // order lower bound and upper bound
+ let (l_span, u_span, l_inc, u_inc) = if l.ord == Ordering::Less {
+ (l.val_span, r.val_span, l.inc, r.inc)
+ } else {
+ (r.val_span, l.val_span, r.inc, l.inc)
+ };
+ if l_inc {
+ return;
+ }
+ let (range_type, range_op) = if u_inc {
+ ("Range", "..")
+ } else {
+ ("RangeInclusive", "..=")
+ };
+ let mut applicability = Applicability::MachineApplicable;
+ let name = snippet_with_applicability(cx, l.name_span, "_", &mut applicability);
+ let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
+ let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+ let space = if lo.ends_with('.') { " " } else { "" };
+ span_lint_and_sugg(
+ cx,
+ MANUAL_RANGE_CONTAINS,
+ span,
+ &format!("manual `!{range_type}::contains` implementation"),
+ "use",
+ format!("!({lo}{space}{range_op}{hi}).contains(&{name})"),
+ applicability,
+ );
+ }
+ }
+
+ // If the LHS is the same operator, we have to recurse to get the "real" RHS, since they have
+ // the same operator precedence
+ if_chain! {
+ if let ExprKind::Binary(ref lhs_op, _left, new_lhs) = left.kind;
+ if op == lhs_op.node;
+ let new_span = Span::new(new_lhs.span.lo(), right.span.hi(), expr.span.ctxt(), expr.span.parent());
+ if let Some(snip) = &snippet_opt(cx, new_span);
+ // Do not continue if we have mismatched number of parens, otherwise the suggestion is wrong
+ if snip.matches('(').count() == snip.matches(')').count();
+ then {
+ check_possible_range_contains(cx, op, new_lhs, right, expr, new_span);
+ }
+ }
+}
+
+struct RangeBounds<'a> {
+ val: Constant,
+ expr: &'a Expr<'a>,
+ id: HirId,
+ name_span: Span,
+ val_span: Span,
+ ord: Ordering,
+ inc: bool,
+}
+
+// Takes a binary expression such as x <= 2 as input
+// Breaks apart into various pieces, such as the value of the number,
+// hir id of the variable, and direction/inclusiveness of the operator
+fn check_range_bounds<'a>(cx: &'a LateContext<'_>, ex: &'a Expr<'_>) -> Option<RangeBounds<'a>> {
+ if let ExprKind::Binary(ref op, l, r) = ex.kind {
+ let (inclusive, ordering) = match op.node {
+ BinOpKind::Gt => (false, Ordering::Greater),
+ BinOpKind::Ge => (true, Ordering::Greater),
+ BinOpKind::Lt => (false, Ordering::Less),
+ BinOpKind::Le => (true, Ordering::Less),
+ _ => return None,
+ };
+ if let Some(id) = path_to_local(l) {
+ if let Some((c, _)) = constant(cx, cx.typeck_results(), r) {
+ return Some(RangeBounds {
+ val: c,
+ expr: r,
+ id,
+ name_span: l.span,
+ val_span: r.span,
+ ord: ordering,
+ inc: inclusive,
+ });
+ }
+ } else if let Some(id) = path_to_local(r) {
+ if let Some((c, _)) = constant(cx, cx.typeck_results(), l) {
+ return Some(RangeBounds {
+ val: c,
+ expr: l,
+ id,
+ name_span: r.span,
+ val_span: l.span,
+ ord: ordering.reverse(),
+ inc: inclusive,
+ });
+ }
+ }
+ }
+ None
+}
+
+// exclusive range plus one: `x..(y+1)`
+fn check_exclusive_range_plus_one(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ if expr.span.can_be_used_for_suggestions();
+ if let Some(higher::Range {
+ start,
+ end: Some(end),
+ limits: RangeLimits::HalfOpen
+ }) = higher::Range::hir(expr);
+ if let Some(y) = y_plus_one(cx, end);
+ then {
+ let span = expr.span;
+ span_lint_and_then(
+ cx,
+ RANGE_PLUS_ONE,
+ span,
+ "an inclusive range would be more readable",
+ |diag| {
+ let start = start.map_or(String::new(), |x| Sugg::hir(cx, x, "x").maybe_par().to_string());
+ let end = Sugg::hir(cx, y, "y").maybe_par();
+ if let Some(is_wrapped) = &snippet_opt(cx, span) {
+ if is_wrapped.starts_with('(') && is_wrapped.ends_with(')') {
+ diag.span_suggestion(
+ span,
+ "use",
+ format!("({start}..={end})"),
+ Applicability::MaybeIncorrect,
+ );
+ } else {
+ diag.span_suggestion(
+ span,
+ "use",
+ format!("{start}..={end}"),
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ },
+ );
+ }
+ }
+}
+
+// inclusive range minus one: `x..=(y-1)`
+fn check_inclusive_range_minus_one(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ if expr.span.can_be_used_for_suggestions();
+ if let Some(higher::Range { start, end: Some(end), limits: RangeLimits::Closed }) = higher::Range::hir(expr);
+ if let Some(y) = y_minus_one(cx, end);
+ then {
+ span_lint_and_then(
+ cx,
+ RANGE_MINUS_ONE,
+ expr.span,
+ "an exclusive range would be more readable",
+ |diag| {
+ let start = start.map_or(String::new(), |x| Sugg::hir(cx, x, "x").maybe_par().to_string());
+ let end = Sugg::hir(cx, y, "y").maybe_par();
+ diag.span_suggestion(
+ expr.span,
+ "use",
+ format!("{start}..{end}"),
+ Applicability::MachineApplicable, // snippet
+ );
+ },
+ );
+ }
+ }
+}
+
+fn check_reversed_empty_range(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ fn inside_indexing_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ matches!(
+ get_parent_expr(cx, expr),
+ Some(Expr {
+ kind: ExprKind::Index(..),
+ ..
+ })
+ )
+ }
+
+ fn is_for_loop_arg(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ let mut cur_expr = expr;
+ while let Some(parent_expr) = get_parent_expr(cx, cur_expr) {
+ match higher::ForLoop::hir(parent_expr) {
+ Some(higher::ForLoop { arg, .. }) if arg.hir_id == expr.hir_id => return true,
+ _ => cur_expr = parent_expr,
+ }
+ }
+
+ false
+ }
+
+ fn is_empty_range(limits: RangeLimits, ordering: Ordering) -> bool {
+ match limits {
+ RangeLimits::HalfOpen => ordering != Ordering::Less,
+ RangeLimits::Closed => ordering == Ordering::Greater,
+ }
+ }
+
+ if_chain! {
+ if let Some(higher::Range { start: Some(start), end: Some(end), limits }) = higher::Range::hir(expr);
+ let ty = cx.typeck_results().expr_ty(start);
+ if let ty::Int(_) | ty::Uint(_) = ty.kind();
+ if let Some((start_idx, _)) = constant(cx, cx.typeck_results(), start);
+ if let Some((end_idx, _)) = constant(cx, cx.typeck_results(), end);
+ if let Some(ordering) = Constant::partial_cmp(cx.tcx, ty, &start_idx, &end_idx);
+ if is_empty_range(limits, ordering);
+ then {
+ if inside_indexing_expr(cx, expr) {
+ // Avoid linting `N..N` as it has proven to be useful, see #5689 and #5628 ...
+ if ordering != Ordering::Equal {
+ span_lint(
+ cx,
+ REVERSED_EMPTY_RANGES,
+ expr.span,
+ "this range is reversed and using it to index a slice will panic at run-time",
+ );
+ }
+ // ... except in for loop arguments for backwards compatibility with `reverse_range_loop`
+ } else if ordering != Ordering::Equal || is_for_loop_arg(cx, expr) {
+ span_lint_and_then(
+ cx,
+ REVERSED_EMPTY_RANGES,
+ expr.span,
+ "this range is empty so it will yield no values",
+ |diag| {
+ if ordering != Ordering::Equal {
+ let start_snippet = snippet(cx, start.span, "_");
+ let end_snippet = snippet(cx, end.span, "_");
+ let dots = match limits {
+ RangeLimits::HalfOpen => "..",
+ RangeLimits::Closed => "..="
+ };
+
+ diag.span_suggestion(
+ expr.span,
+ "consider using the following if you are attempting to iterate over this \
+ range in reverse",
+ format!("({end_snippet}{dots}{start_snippet}).rev()"),
+ Applicability::MaybeIncorrect,
+ );
+ }
+ },
+ );
+ }
+ }
+ }
+}
+
+fn y_plus_one<'t>(cx: &LateContext<'_>, expr: &'t Expr<'_>) -> Option<&'t Expr<'t>> {
+ match expr.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ lhs,
+ rhs,
+ ) => {
+ if is_integer_const(cx, lhs, 1) {
+ Some(rhs)
+ } else if is_integer_const(cx, rhs, 1) {
+ Some(lhs)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+fn y_minus_one<'t>(cx: &LateContext<'_>, expr: &'t Expr<'_>) -> Option<&'t Expr<'t>> {
+ match expr.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Sub, ..
+ },
+ lhs,
+ rhs,
+ ) if is_integer_const(cx, rhs, 1) => Some(lhs),
+ _ => None,
+ }
+}
--- /dev/null
- if cannot_move_out || !possible_borrower.at_most_borrowers(cx, &[arg], cloned, loc) {
+use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
+use clippy_utils::mir::{visit_local_usage, LocalUsage, PossibleBorrowerMap};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{has_drop, is_copy, is_type_diagnostic_item, is_type_lang_item, walk_ptrs_ty_depth};
+use clippy_utils::{fn_has_unsatisfiable_preds, match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{def_id, Body, FnDecl, HirId, LangItem};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::mir;
+use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::{BytePos, Span};
+use rustc_span::sym;
+
+macro_rules! unwrap_or_continue {
+ ($x:expr) => {
+ match $x {
+ Some(x) => x,
+ None => continue,
+ }
+ };
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for a redundant `clone()` (and its relatives) which clones an owned
+ /// value that is going to be dropped without further use.
+ ///
+ /// ### Why is this bad?
+ /// It is not always possible for the compiler to eliminate useless
+ /// allocations and deallocations generated by redundant `clone()`s.
+ ///
+ /// ### Known problems
+ /// False-negatives: analysis performed by this lint is conservative and limited.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::path::Path;
+ /// # #[derive(Clone)]
+ /// # struct Foo;
+ /// # impl Foo {
+ /// # fn new() -> Self { Foo {} }
+ /// # }
+ /// # fn call(x: Foo) {}
+ /// {
+ /// let x = Foo::new();
+ /// call(x.clone());
+ /// call(x.clone()); // this can just pass `x`
+ /// }
+ ///
+ /// ["lorem", "ipsum"].join(" ").to_string();
+ ///
+ /// Path::new("/a/b").join("c").to_path_buf();
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub REDUNDANT_CLONE,
+ perf,
+ "`clone()` of an owned value that is going to be dropped immediately"
+}
+
+declare_lint_pass!(RedundantClone => [REDUNDANT_CLONE]);
+
+impl<'tcx> LateLintPass<'tcx> for RedundantClone {
+ #[expect(clippy::too_many_lines)]
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ _: FnKind<'tcx>,
+ _: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ _: Span,
+ _: HirId,
+ ) {
+ let def_id = cx.tcx.hir().body_owner_def_id(body.id());
+
+ // Building MIR for `fn`s with unsatisfiable preds results in ICE.
+ if fn_has_unsatisfiable_preds(cx, def_id.to_def_id()) {
+ return;
+ }
+
+ let mir = cx.tcx.optimized_mir(def_id.to_def_id());
+
+ let mut possible_borrower = PossibleBorrowerMap::new(cx, mir);
+
+ for (bb, bbdata) in mir.basic_blocks.iter_enumerated() {
+ let terminator = bbdata.terminator();
+
+ if terminator.source_info.span.from_expansion() {
+ continue;
+ }
+
+ // Give up on loops
+ if terminator.successors().any(|s| s == bb) {
+ continue;
+ }
+
+ let (fn_def_id, arg, arg_ty, clone_ret) =
+ unwrap_or_continue!(is_call_with_ref_arg(cx, mir, &terminator.kind));
+
+ let from_borrow = match_def_path(cx, fn_def_id, &paths::CLONE_TRAIT_METHOD)
+ || match_def_path(cx, fn_def_id, &paths::TO_OWNED_METHOD)
+ || (match_def_path(cx, fn_def_id, &paths::TO_STRING_METHOD)
+ && is_type_lang_item(cx, arg_ty, LangItem::String));
+
+ let from_deref = !from_borrow
+ && (match_def_path(cx, fn_def_id, &paths::PATH_TO_PATH_BUF)
+ || match_def_path(cx, fn_def_id, &paths::OS_STR_TO_OS_STRING));
+
+ if !from_borrow && !from_deref {
+ continue;
+ }
+
+ if let ty::Adt(def, _) = arg_ty.kind() {
+ if def.is_manually_drop() {
+ continue;
+ }
+ }
+
+ // `{ arg = &cloned; clone(move arg); }` or `{ arg = &cloned; to_path_buf(arg); }`
+ let (cloned, cannot_move_out) = unwrap_or_continue!(find_stmt_assigns_to(cx, mir, arg, from_borrow, bb));
+
+ let loc = mir::Location {
+ block: bb,
+ statement_index: bbdata.statements.len(),
+ };
+
+ // `Local` to be cloned, and a local of `clone` call's destination
+ let (local, ret_local) = if from_borrow {
+ // `res = clone(arg)` can be turned into `res = move arg;`
+ // if `arg` is the only borrow of `cloned` at this point.
+
- if cannot_move_out || !possible_borrower.at_most_borrowers(cx, &[arg, cloned], local, loc) {
++ if cannot_move_out || !possible_borrower.only_borrowers(&[arg], cloned, loc) {
+ continue;
+ }
+
+ (cloned, clone_ret)
+ } else {
+ // `arg` is a reference as it is `.deref()`ed in the previous block.
+ // Look into the predecessor block and find out the source of deref.
+
+ let ps = &mir.basic_blocks.predecessors()[bb];
+ if ps.len() != 1 {
+ continue;
+ }
+ let pred_terminator = mir[ps[0]].terminator();
+
+ // receiver of the `deref()` call
+ let (pred_arg, deref_clone_ret) = if_chain! {
+ if let Some((pred_fn_def_id, pred_arg, pred_arg_ty, res)) =
+ is_call_with_ref_arg(cx, mir, &pred_terminator.kind);
+ if res == cloned;
+ if cx.tcx.is_diagnostic_item(sym::deref_method, pred_fn_def_id);
+ if is_type_diagnostic_item(cx, pred_arg_ty, sym::PathBuf)
+ || is_type_diagnostic_item(cx, pred_arg_ty, sym::OsString);
+ then {
+ (pred_arg, res)
+ } else {
+ continue;
+ }
+ };
+
+ let (local, cannot_move_out) =
+ unwrap_or_continue!(find_stmt_assigns_to(cx, mir, pred_arg, true, ps[0]));
+ let loc = mir::Location {
+ block: bb,
+ statement_index: mir.basic_blocks[bb].statements.len(),
+ };
+
+ // This can be turned into `res = move local` if `arg` and `cloned` are not borrowed
+ // at the last statement:
+ //
+ // ```
+ // pred_arg = &local;
+ // cloned = deref(pred_arg);
+ // arg = &cloned;
+ // StorageDead(pred_arg);
+ // res = to_path_buf(cloned);
+ // ```
++ if cannot_move_out || !possible_borrower.only_borrowers(&[arg, cloned], local, loc) {
+ continue;
+ }
+
+ (local, deref_clone_ret)
+ };
+
+ let clone_usage = if local == ret_local {
+ CloneUsage {
+ cloned_used: false,
+ cloned_consume_or_mutate_loc: None,
+ clone_consumed_or_mutated: true,
+ }
+ } else {
+ let clone_usage = visit_clone_usage(local, ret_local, mir, bb);
+ if clone_usage.cloned_used && clone_usage.clone_consumed_or_mutated {
+ // cloned value is used, and the clone is modified or moved
+ continue;
+ } else if let Some(loc) = clone_usage.cloned_consume_or_mutate_loc {
+ // cloned value is mutated, and the clone is alive.
+ if possible_borrower.local_is_alive_at(ret_local, loc) {
+ continue;
+ }
+ }
+ clone_usage
+ };
+
+ let span = terminator.source_info.span;
+ let scope = terminator.source_info.scope;
+ let node = mir.source_scopes[scope]
+ .local_data
+ .as_ref()
+ .assert_crate_local()
+ .lint_root;
+
+ if_chain! {
+ if let Some(snip) = snippet_opt(cx, span);
+ if let Some(dot) = snip.rfind('.');
+ then {
+ let sugg_span = span.with_lo(
+ span.lo() + BytePos(u32::try_from(dot).unwrap())
+ );
+ let mut app = Applicability::MaybeIncorrect;
+
+ let call_snip = &snip[dot + 1..];
+ // Machine applicable when `call_snip` looks like `foobar()`
+ if let Some(call_snip) = call_snip.strip_suffix("()").map(str::trim) {
+ if call_snip.as_bytes().iter().all(|b| b.is_ascii_alphabetic() || *b == b'_') {
+ app = Applicability::MachineApplicable;
+ }
+ }
+
+ span_lint_hir_and_then(cx, REDUNDANT_CLONE, node, sugg_span, "redundant clone", |diag| {
+ diag.span_suggestion(
+ sugg_span,
+ "remove this",
+ "",
+ app,
+ );
+ if clone_usage.cloned_used {
+ diag.span_note(
+ span,
+ "cloned value is neither consumed nor mutated",
+ );
+ } else {
+ diag.span_note(
+ span.with_hi(span.lo() + BytePos(u32::try_from(dot).unwrap())),
+ "this value is dropped without further use",
+ );
+ }
+ });
+ } else {
+ span_lint_hir(cx, REDUNDANT_CLONE, node, span, "redundant clone");
+ }
+ }
+ }
+ }
+}
+
+/// If `kind` is `y = func(x: &T)` where `T: !Copy`, returns `(DefId of func, x, T, y)`.
+fn is_call_with_ref_arg<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &'tcx mir::Body<'tcx>,
+ kind: &'tcx mir::TerminatorKind<'tcx>,
+) -> Option<(def_id::DefId, mir::Local, Ty<'tcx>, mir::Local)> {
+ if_chain! {
+ if let mir::TerminatorKind::Call { func, args, destination, .. } = kind;
+ if args.len() == 1;
+ if let mir::Operand::Move(mir::Place { local, .. }) = &args[0];
+ if let ty::FnDef(def_id, _) = *func.ty(mir, cx.tcx).kind();
+ if let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].ty(mir, cx.tcx));
+ if !is_copy(cx, inner_ty);
+ then {
+ Some((def_id, *local, inner_ty, destination.as_local()?))
+ } else {
+ None
+ }
+ }
+}
+
+type CannotMoveOut = bool;
+
+/// Finds the first `to = (&)from`, and returns
+/// ``Some((from, whether `from` cannot be moved out))``.
+fn find_stmt_assigns_to<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &mir::Body<'tcx>,
+ to_local: mir::Local,
+ by_ref: bool,
+ bb: mir::BasicBlock,
+) -> Option<(mir::Local, CannotMoveOut)> {
+ let rvalue = mir.basic_blocks[bb].statements.iter().rev().find_map(|stmt| {
+ if let mir::StatementKind::Assign(box (mir::Place { local, .. }, v)) = &stmt.kind {
+ return if *local == to_local { Some(v) } else { None };
+ }
+
+ None
+ })?;
+
+ match (by_ref, rvalue) {
+ (true, mir::Rvalue::Ref(_, _, place)) | (false, mir::Rvalue::Use(mir::Operand::Copy(place))) => {
+ Some(base_local_and_movability(cx, mir, *place))
+ },
+ (false, mir::Rvalue::Ref(_, _, place)) => {
+ if let [mir::ProjectionElem::Deref] = place.as_ref().projection {
+ Some(base_local_and_movability(cx, mir, *place))
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Extracts and returns the undermost base `Local` of given `place`. Returns `place` itself
+/// if it is already a `Local`.
+///
+/// Also reports whether given `place` cannot be moved out.
+fn base_local_and_movability<'tcx>(
+ cx: &LateContext<'tcx>,
+ mir: &mir::Body<'tcx>,
+ place: mir::Place<'tcx>,
+) -> (mir::Local, CannotMoveOut) {
+ use rustc_middle::mir::PlaceRef;
+
+ // Dereference. You cannot move things out from a borrowed value.
+ let mut deref = false;
+ // Accessing a field of an ADT that has `Drop`. Moving the field out will cause E0509.
+ let mut field = false;
+ // If projection is a slice index then clone can be removed only if the
+ // underlying type implements Copy
+ let mut slice = false;
+
+ let PlaceRef { local, mut projection } = place.as_ref();
+ while let [base @ .., elem] = projection {
+ projection = base;
+ deref |= matches!(elem, mir::ProjectionElem::Deref);
+ field |= matches!(elem, mir::ProjectionElem::Field(..))
+ && has_drop(cx, mir::Place::ty_from(local, projection, &mir.local_decls, cx.tcx).ty);
+ slice |= matches!(elem, mir::ProjectionElem::Index(..))
+ && !is_copy(cx, mir::Place::ty_from(local, projection, &mir.local_decls, cx.tcx).ty);
+ }
+
+ (local, deref || field || slice)
+}
+
+#[derive(Default)]
+struct CloneUsage {
+ /// Whether the cloned value is used after the clone.
+ cloned_used: bool,
+ /// The first location where the cloned value is consumed or mutated, if any.
+ cloned_consume_or_mutate_loc: Option<mir::Location>,
+ /// Whether the clone value is mutated.
+ clone_consumed_or_mutated: bool,
+}
+
+fn visit_clone_usage(cloned: mir::Local, clone: mir::Local, mir: &mir::Body<'_>, bb: mir::BasicBlock) -> CloneUsage {
+ if let Some((
+ LocalUsage {
+ local_use_locs: cloned_use_locs,
+ local_consume_or_mutate_locs: cloned_consume_or_mutate_locs,
+ },
+ LocalUsage {
+ local_use_locs: _,
+ local_consume_or_mutate_locs: clone_consume_or_mutate_locs,
+ },
+ )) = visit_local_usage(
+ &[cloned, clone],
+ mir,
+ mir::Location {
+ block: bb,
+ statement_index: mir.basic_blocks[bb].statements.len(),
+ },
+ )
+ .map(|mut vec| (vec.remove(0), vec.remove(0)))
+ {
+ CloneUsage {
+ cloned_used: !cloned_use_locs.is_empty(),
+ cloned_consume_or_mutate_loc: cloned_consume_or_mutate_locs.first().copied(),
+ // Consider non-temporary clones consumed.
+ // TODO: Actually check for mutation of non-temporaries.
+ clone_consumed_or_mutated: mir.local_kind(clone) != mir::LocalKind::Temp
+ || !clone_consume_or_mutate_locs.is_empty(),
+ }
+ } else {
+ CloneUsage {
+ cloned_used: true,
+ cloned_consume_or_mutate_loc: None,
+ clone_consumed_or_mutated: true,
+ }
+ }
+}
--- /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::derive_hash_xor_eq", "clippy::derived_hash_with_manual_eq"),
+ ("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
- && let ExprKind::Path(QPath::LangItem(LangItem::TryTraitFromYeet, _, _)) = path_expr.kind {
- return;
+use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir_and_then};
+use clippy_utils::source::{snippet_opt, snippet_with_context};
+use clippy_utils::visitors::{for_each_expr, Descend};
+use clippy_utils::{fn_def_id, path_to_local_id};
+use core::ops::ControlFlow;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{Block, Body, Expr, ExprKind, FnDecl, HirId, LangItem, MatchSource, PatKind, QPath, StmtKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::subst::GenericArgKind;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::{BytePos, Pos};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `let`-bindings, which are subsequently
+ /// returned.
+ ///
+ /// ### Why is this bad?
+ /// It is just extraneous code. Remove it to make your code
+ /// more rusty.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo() -> String {
+ /// let x = String::new();
+ /// x
+ /// }
+ /// ```
+ /// instead, use
+ /// ```
+ /// fn foo() -> String {
+ /// String::new()
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LET_AND_RETURN,
+ style,
+ "creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for return statements at the end of a block.
+ ///
+ /// ### Why is this bad?
+ /// Removing the `return` and semicolon will make the code
+ /// more rusty.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(x: usize) -> usize {
+ /// return x;
+ /// }
+ /// ```
+ /// simplify to
+ /// ```rust
+ /// fn foo(x: usize) -> usize {
+ /// x
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEEDLESS_RETURN,
+ style,
+ "using a return statement like `return expr;` where an expression would suffice"
+}
+
+#[derive(PartialEq, Eq, Copy, Clone)]
+enum RetReplacement {
+ Empty,
+ Block,
+ Unit,
+}
+
+impl RetReplacement {
+ fn sugg_help(self) -> &'static str {
+ match self {
+ Self::Empty => "remove `return`",
+ Self::Block => "replace `return` with an empty block",
+ Self::Unit => "replace `return` with a unit value",
+ }
+ }
+}
+
+impl ToString for RetReplacement {
+ fn to_string(&self) -> String {
+ match *self {
+ Self::Empty => "",
+ Self::Block => "{}",
+ Self::Unit => "()",
+ }
+ .to_string()
+ }
+}
+
+declare_lint_pass!(Return => [LET_AND_RETURN, NEEDLESS_RETURN]);
+
+impl<'tcx> LateLintPass<'tcx> for Return {
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'_>) {
+ // we need both a let-binding stmt and an expr
+ if_chain! {
+ if let Some(retexpr) = block.expr;
+ if let Some(stmt) = block.stmts.iter().last();
+ if let StmtKind::Local(local) = &stmt.kind;
+ if local.ty.is_none();
+ if cx.tcx.hir().attrs(local.hir_id).is_empty();
+ if let Some(initexpr) = &local.init;
+ if let PatKind::Binding(_, local_id, _, _) = local.pat.kind;
+ if path_to_local_id(retexpr, local_id);
+ if !last_statement_borrows(cx, initexpr);
+ if !in_external_macro(cx.sess(), initexpr.span);
+ if !in_external_macro(cx.sess(), retexpr.span);
+ if !local.span.from_expansion();
+ then {
+ span_lint_hir_and_then(
+ cx,
+ LET_AND_RETURN,
+ retexpr.hir_id,
+ retexpr.span,
+ "returning the result of a `let` binding from a block",
+ |err| {
+ err.span_label(local.span, "unnecessary `let` binding");
+
+ if let Some(mut snippet) = snippet_opt(cx, initexpr.span) {
+ if !cx.typeck_results().expr_adjustments(retexpr).is_empty() {
+ snippet.push_str(" as _");
+ }
+ err.multipart_suggestion(
+ "return the expression directly",
+ vec![
+ (local.span, String::new()),
+ (retexpr.span, snippet),
+ ],
+ Applicability::MachineApplicable,
+ );
+ } else {
+ err.span_help(initexpr.span, "this expression can be directly returned");
+ }
+ },
+ );
+ }
+ }
+ }
+
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ kind: FnKind<'tcx>,
+ _: &'tcx FnDecl<'tcx>,
+ body: &'tcx Body<'tcx>,
+ _: Span,
+ _: HirId,
+ ) {
+ match kind {
+ FnKind::Closure => {
+ // when returning without value in closure, replace this `return`
+ // with an empty block to prevent invalid suggestion (see #6501)
+ let replacement = if let ExprKind::Ret(None) = &body.value.kind {
+ RetReplacement::Block
+ } else {
+ RetReplacement::Empty
+ };
+ check_final_expr(cx, body.value, vec![], replacement);
+ },
+ FnKind::ItemFn(..) | FnKind::Method(..) => {
+ check_block_return(cx, &body.value.kind, vec![]);
+ },
+ }
+ }
+}
+
+// if `expr` is a block, check if there are needless returns in it
+fn check_block_return<'tcx>(cx: &LateContext<'tcx>, expr_kind: &ExprKind<'tcx>, semi_spans: Vec<Span>) {
+ if let ExprKind::Block(block, _) = expr_kind {
+ if let Some(block_expr) = block.expr {
+ check_final_expr(cx, block_expr, semi_spans, RetReplacement::Empty);
+ } else if let Some(stmt) = block.stmts.iter().last() {
+ match stmt.kind {
+ StmtKind::Expr(expr) => {
+ check_final_expr(cx, expr, semi_spans, RetReplacement::Empty);
+ },
+ StmtKind::Semi(semi_expr) => {
+ let mut semi_spans_and_this_one = semi_spans;
+ // we only want the span containing the semicolon so we can remove it later. From `entry.rs:382`
+ if let Some(semicolon_span) = stmt.span.trim_start(semi_expr.span) {
+ semi_spans_and_this_one.push(semicolon_span);
+ check_final_expr(cx, semi_expr, semi_spans_and_this_one, RetReplacement::Empty);
+ }
+ },
+ _ => (),
+ }
+ }
+ }
+}
+
+fn check_final_expr<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'tcx>,
+ semi_spans: Vec<Span>, /* containing all the places where we would need to remove semicolons if finding an
+ * needless return */
+ replacement: RetReplacement,
+) {
+ let peeled_drop_expr = expr.peel_drop_temps();
+ match &peeled_drop_expr.kind {
+ // simple return is always "bad"
+ ExprKind::Ret(ref inner) => {
+ // if desugar of `do yeet`, don't lint
+ if let Some(inner_expr) = inner
+ && let ExprKind::Call(path_expr, _) = inner_expr.kind
- if cx.tcx.hir().attrs(expr.hir_id).is_empty() {
- let borrows = inner.map_or(false, |inner| last_statement_borrows(cx, inner));
- if !borrows {
- // check if expr return nothing
- let ret_span = if inner.is_none() && replacement == RetReplacement::Empty {
- extend_span_to_previous_non_ws(cx, peeled_drop_expr.span)
- } else {
- peeled_drop_expr.span
- };
-
- emit_return_lint(cx, ret_span, semi_spans, inner.as_ref().map(|i| i.span), replacement);
- }
++ && let ExprKind::Path(QPath::LangItem(LangItem::TryTraitFromYeet, _, _)) = path_expr.kind
++ {
++ return;
+ }
- ControlFlow::Continue(Descend::from(!expr.span.from_expansion()))
++ if !cx.tcx.hir().attrs(expr.hir_id).is_empty() {
++ return;
++ }
++ let borrows = inner.map_or(false, |inner| last_statement_borrows(cx, inner));
++ if borrows {
++ return;
+ }
++ // check if expr return nothing
++ let ret_span = if inner.is_none() && replacement == RetReplacement::Empty {
++ extend_span_to_previous_non_ws(cx, peeled_drop_expr.span)
++ } else {
++ peeled_drop_expr.span
++ };
++
++ emit_return_lint(cx, ret_span, semi_spans, inner.as_ref().map(|i| i.span), replacement);
+ },
+ ExprKind::If(_, then, else_clause_opt) => {
+ check_block_return(cx, &then.kind, semi_spans.clone());
+ if let Some(else_clause) = else_clause_opt {
+ check_block_return(cx, &else_clause.kind, semi_spans);
+ }
+ },
+ // a match expr, check all arms
+ // an if/if let expr, check both exprs
+ // note, if without else is going to be a type checking error anyways
+ // (except for unit type functions) so we don't match it
+ ExprKind::Match(_, arms, MatchSource::Normal) => {
+ for arm in arms.iter() {
+ check_final_expr(cx, arm.body, semi_spans.clone(), RetReplacement::Unit);
+ }
+ },
+ // if it's a whole block, check it
+ other_expr_kind => check_block_return(cx, other_expr_kind, semi_spans),
+ }
+}
+
+fn emit_return_lint(
+ cx: &LateContext<'_>,
+ ret_span: Span,
+ semi_spans: Vec<Span>,
+ inner_span: Option<Span>,
+ replacement: RetReplacement,
+) {
+ if ret_span.from_expansion() {
+ return;
+ }
+ let mut applicability = Applicability::MachineApplicable;
+ let return_replacement = inner_span.map_or_else(
+ || replacement.to_string(),
+ |inner_span| {
+ let (snippet, _) = snippet_with_context(cx, inner_span, ret_span.ctxt(), "..", &mut applicability);
+ snippet.to_string()
+ },
+ );
+ let sugg_help = if inner_span.is_some() {
+ "remove `return`"
+ } else {
+ replacement.sugg_help()
+ };
+ span_lint_and_then(cx, NEEDLESS_RETURN, ret_span, "unneeded `return` statement", |diag| {
+ diag.span_suggestion_hidden(ret_span, sugg_help, return_replacement, applicability);
+ // for each parent statement, we need to remove the semicolon
+ for semi_stmt_span in semi_spans {
+ diag.tool_only_span_suggestion(semi_stmt_span, "remove this semicolon", "", applicability);
+ }
+ });
+}
+
+fn last_statement_borrows<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+ for_each_expr(expr, |e| {
+ if let Some(def_id) = fn_def_id(cx, e)
+ && cx
+ .tcx
+ .fn_sig(def_id)
+ .skip_binder()
+ .output()
+ .walk()
+ .any(|arg| matches!(arg.unpack(), GenericArgKind::Lifetime(_)))
+ {
+ ControlFlow::Break(())
+ } else {
++ ControlFlow::Continue(Descend::from(!e.span.from_expansion()))
+ }
+ })
+ .is_some()
+}
+
+// Go backwards while encountering whitespace and extend the given Span to that point.
+fn extend_span_to_previous_non_ws(cx: &LateContext<'_>, sp: Span) -> Span {
+ if let Ok(prev_source) = cx.sess().source_map().span_to_prev_source(sp) {
+ let ws = [' ', '\t', '\n'];
+ if let Some(non_ws_pos) = prev_source.rfind(|c| !ws.contains(&c)) {
+ let len = prev_source.len() - non_ws_pos - 1;
+ return sp.with_lo(sp.lo() - BytePos::from_usize(len));
+ }
+ }
+
+ sp
+}
--- /dev/null
- /// Gankro says:
+mod borrowed_box;
+mod box_collection;
+mod linked_list;
+mod option_option;
+mod rc_buffer;
+mod rc_mutex;
+mod redundant_allocation;
+mod type_complexity;
+mod utils;
+mod vec_box;
+
+use rustc_hir as hir;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{
+ Body, FnDecl, FnRetTy, GenericArg, HirId, ImplItem, ImplItemKind, Item, ItemKind, Local, MutTy, QPath, TraitItem,
+ TraitItemKind, TyKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `Box<T>` where T is a collection such as Vec anywhere in the code.
+ /// Check the [Box documentation](https://doc.rust-lang.org/std/boxed/index.html) for more information.
+ ///
+ /// ### Why is this bad?
+ /// Collections already keeps their contents in a separate area on
+ /// the heap. So if you `Box` them, you just add another level of indirection
+ /// without any benefit whatsoever.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// struct X {
+ /// values: Box<Vec<Foo>>,
+ /// }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust,ignore
+ /// struct X {
+ /// values: Vec<Foo>,
+ /// }
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub BOX_COLLECTION,
+ perf,
+ "usage of `Box<Vec<T>>`, vector elements are already on the heap"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `Vec<Box<T>>` where T: Sized anywhere in the code.
+ /// Check the [Box documentation](https://doc.rust-lang.org/std/boxed/index.html) for more information.
+ ///
+ /// ### Why is this bad?
+ /// `Vec` already keeps its contents in a separate area on
+ /// the heap. So if you `Box` its contents, you just add another level of indirection.
+ ///
+ /// ### Known problems
+ /// Vec<Box<T: Sized>> makes sense if T is a large type (see [#3530](https://github.com/rust-lang/rust-clippy/issues/3530),
+ /// 1st comment).
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct X {
+ /// values: Vec<Box<i32>>,
+ /// }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust
+ /// struct X {
+ /// values: Vec<i32>,
+ /// }
+ /// ```
+ #[clippy::version = "1.33.0"]
+ pub VEC_BOX,
+ complexity,
+ "usage of `Vec<Box<T>>` where T: Sized, vector elements are already on the heap"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `Option<Option<_>>` in function signatures and type
+ /// definitions
+ ///
+ /// ### Why is this bad?
+ /// `Option<_>` represents an optional value. `Option<Option<_>>`
+ /// represents an optional optional value which is logically the same thing as an optional
+ /// value but has an unneeded extra level of wrapping.
+ ///
+ /// If you have a case where `Some(Some(_))`, `Some(None)` and `None` are distinct cases,
+ /// consider a custom `enum` instead, with clear names for each case.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn get_data() -> Option<Option<u32>> {
+ /// None
+ /// }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust
+ /// pub enum Contents {
+ /// Data(Vec<u8>), // Was Some(Some(Vec<u8>))
+ /// NotYetFetched, // Was Some(None)
+ /// None, // Was None
+ /// }
+ ///
+ /// fn get_data() -> Contents {
+ /// Contents::None
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OPTION_OPTION,
+ pedantic,
+ "usage of `Option<Option<T>>`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of any `LinkedList`, suggesting to use a
+ /// `Vec` or a `VecDeque` (formerly called `RingBuf`).
+ ///
+ /// ### Why is this bad?
++ /// Gankra says:
+ ///
+ /// > The TL;DR of `LinkedList` is that it's built on a massive amount of
+ /// pointers and indirection.
+ /// > It wastes memory, it has terrible cache locality, and is all-around slow.
+ /// `RingBuf`, while
+ /// > "only" amortized for push/pop, should be faster in the general case for
+ /// almost every possible
+ /// > workload, and isn't even amortized at all if you can predict the capacity
+ /// you need.
+ /// >
+ /// > `LinkedList`s are only really good if you're doing a lot of merging or
+ /// splitting of lists.
+ /// > This is because they can just mangle some pointers instead of actually
+ /// copying the data. Even
+ /// > if you're doing a lot of insertion in the middle of the list, `RingBuf`
+ /// can still be better
+ /// > because of how expensive it is to seek to the middle of a `LinkedList`.
+ ///
+ /// ### Known problems
+ /// False positives – the instances where using a
+ /// `LinkedList` makes sense are few and far between, but they can still happen.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::LinkedList;
+ /// let x: LinkedList<usize> = LinkedList::new();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LINKEDLIST,
+ pedantic,
+ "usage of LinkedList, usually a vector is faster, or a more specialized data structure like a `VecDeque`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `&Box<T>` anywhere in the code.
+ /// Check the [Box documentation](https://doc.rust-lang.org/std/boxed/index.html) for more information.
+ ///
+ /// ### Why is this bad?
+ /// A `&Box<T>` parameter requires the function caller to box `T` first before passing it to a function.
+ /// Using `&T` defines a concrete type for the parameter and generalizes the function, this would also
+ /// auto-deref to `&T` at the function call site if passed a `&Box<T>`.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// fn foo(bar: &Box<T>) { ... }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust,ignore
+ /// fn foo(bar: &T) { ... }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub BORROWED_BOX,
+ complexity,
+ "a borrow of a boxed type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of redundant allocations anywhere in the code.
+ ///
+ /// ### Why is this bad?
+ /// Expressions such as `Rc<&T>`, `Rc<Rc<T>>`, `Rc<Arc<T>>`, `Rc<Box<T>>`, `Arc<&T>`, `Arc<Rc<T>>`,
+ /// `Arc<Arc<T>>`, `Arc<Box<T>>`, `Box<&T>`, `Box<Rc<T>>`, `Box<Arc<T>>`, `Box<Box<T>>`, add an unnecessary level of indirection.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// fn foo(bar: Rc<&usize>) {}
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust
+ /// fn foo(bar: &usize) {}
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub REDUNDANT_ALLOCATION,
+ perf,
+ "redundant allocation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `Rc<T>` and `Arc<T>` when `T` is a mutable buffer type such as `String` or `Vec`.
+ ///
+ /// ### Why is this bad?
+ /// Expressions such as `Rc<String>` usually have no advantage over `Rc<str>`, since
+ /// it is larger and involves an extra level of indirection, and doesn't implement `Borrow<str>`.
+ ///
+ /// While mutating a buffer type would still be possible with `Rc::get_mut()`, it only
+ /// works if there are no additional references yet, which usually defeats the purpose of
+ /// enclosing it in a shared ownership type. Instead, additionally wrapping the inner
+ /// type with an interior mutable container (such as `RefCell` or `Mutex`) would normally
+ /// be used.
+ ///
+ /// ### Known problems
+ /// This pattern can be desirable to avoid the overhead of a `RefCell` or `Mutex` for
+ /// cases where mutation only happens before there are any additional references.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// # use std::rc::Rc;
+ /// fn foo(interned: Rc<String>) { ... }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust,ignore
+ /// fn foo(interned: Rc<str>) { ... }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub RC_BUFFER,
+ restriction,
+ "shared ownership of a buffer type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for types used in structs, parameters and `let`
+ /// declarations above a certain complexity threshold.
+ ///
+ /// ### Why is this bad?
+ /// Too complex types make the code less readable. Consider
+ /// using a `type` definition to simplify them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// struct Foo {
+ /// inner: Rc<Vec<Vec<Box<(u32, u32, u32, u32)>>>>,
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub TYPE_COMPLEXITY,
+ complexity,
+ "usage of very complex types that might be better factored into `type` definitions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `Rc<Mutex<T>>`.
+ ///
+ /// ### Why is this bad?
+ /// `Rc` is used in single thread and `Mutex` is used in multi thread.
+ /// Consider using `Rc<RefCell<T>>` in single thread or `Arc<Mutex<T>>` in multi thread.
+ ///
+ /// ### Known problems
+ /// Sometimes combining generic types can lead to the requirement that a
+ /// type use Rc in conjunction with Mutex. We must consider those cases false positives, but
+ /// alas they are quite hard to rule out. Luckily they are also rare.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// use std::rc::Rc;
+ /// use std::sync::Mutex;
+ /// fn foo(interned: Rc<Mutex<i32>>) { ... }
+ /// ```
+ ///
+ /// Better:
+ ///
+ /// ```rust,ignore
+ /// use std::rc::Rc;
+ /// use std::cell::RefCell
+ /// fn foo(interned: Rc<RefCell<i32>>) { ... }
+ /// ```
+ #[clippy::version = "1.55.0"]
+ pub RC_MUTEX,
+ restriction,
+ "usage of `Rc<Mutex<T>>`"
+}
+
+pub struct Types {
+ vec_box_size_threshold: u64,
+ type_complexity_threshold: u64,
+ avoid_breaking_exported_api: bool,
+}
+
+impl_lint_pass!(Types => [BOX_COLLECTION, VEC_BOX, OPTION_OPTION, LINKEDLIST, BORROWED_BOX, REDUNDANT_ALLOCATION, RC_BUFFER, RC_MUTEX, TYPE_COMPLEXITY]);
+
+impl<'tcx> LateLintPass<'tcx> for Types {
+ fn check_fn(&mut self, cx: &LateContext<'_>, _: FnKind<'_>, decl: &FnDecl<'_>, _: &Body<'_>, _: Span, id: HirId) {
+ let is_in_trait_impl =
+ if let Some(hir::Node::Item(item)) = cx.tcx.hir().find_by_def_id(cx.tcx.hir().get_parent_item(id).def_id) {
+ matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+ } else {
+ false
+ };
+
+ let is_exported = cx.effective_visibilities.is_exported(cx.tcx.hir().local_def_id(id));
+
+ self.check_fn_decl(
+ cx,
+ decl,
+ CheckTyContext {
+ is_in_trait_impl,
+ is_exported,
+ ..CheckTyContext::default()
+ },
+ );
+ }
+
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ let is_exported = cx.effective_visibilities.is_exported(item.owner_id.def_id);
+
+ match item.kind {
+ ItemKind::Static(ty, _, _) | ItemKind::Const(ty, _) => self.check_ty(
+ cx,
+ ty,
+ CheckTyContext {
+ is_exported,
+ ..CheckTyContext::default()
+ },
+ ),
+ // functions, enums, structs, impls and traits are covered
+ _ => (),
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
+ match item.kind {
+ ImplItemKind::Const(ty, _) => {
+ let is_in_trait_impl = if let Some(hir::Node::Item(item)) = cx
+ .tcx
+ .hir()
+ .find_by_def_id(cx.tcx.hir().get_parent_item(item.hir_id()).def_id)
+ {
+ matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+ } else {
+ false
+ };
+
+ self.check_ty(
+ cx,
+ ty,
+ CheckTyContext {
+ is_in_trait_impl,
+ ..CheckTyContext::default()
+ },
+ );
+ },
+ // Methods are covered by check_fn.
+ // Type aliases are ignored because oftentimes it's impossible to
+ // make type alias declaration in trait simpler, see #1013
+ ImplItemKind::Fn(..) | ImplItemKind::Type(..) => (),
+ }
+ }
+
+ fn check_field_def(&mut self, cx: &LateContext<'_>, field: &hir::FieldDef<'_>) {
+ let is_exported = cx
+ .effective_visibilities
+ .is_exported(cx.tcx.hir().local_def_id(field.hir_id));
+
+ self.check_ty(
+ cx,
+ field.ty,
+ CheckTyContext {
+ is_exported,
+ ..CheckTyContext::default()
+ },
+ );
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &TraitItem<'_>) {
+ let is_exported = cx.effective_visibilities.is_exported(item.owner_id.def_id);
+
+ let context = CheckTyContext {
+ is_exported,
+ ..CheckTyContext::default()
+ };
+
+ match item.kind {
+ TraitItemKind::Const(ty, _) | TraitItemKind::Type(_, Some(ty)) => {
+ self.check_ty(cx, ty, context);
+ },
+ TraitItemKind::Fn(ref sig, _) => self.check_fn_decl(cx, sig.decl, context),
+ TraitItemKind::Type(..) => (),
+ }
+ }
+
+ fn check_local(&mut self, cx: &LateContext<'_>, local: &Local<'_>) {
+ if let Some(ty) = local.ty {
+ self.check_ty(
+ cx,
+ ty,
+ CheckTyContext {
+ is_local: true,
+ ..CheckTyContext::default()
+ },
+ );
+ }
+ }
+}
+
+impl Types {
+ pub fn new(vec_box_size_threshold: u64, type_complexity_threshold: u64, avoid_breaking_exported_api: bool) -> Self {
+ Self {
+ vec_box_size_threshold,
+ type_complexity_threshold,
+ avoid_breaking_exported_api,
+ }
+ }
+
+ fn check_fn_decl(&mut self, cx: &LateContext<'_>, decl: &FnDecl<'_>, context: CheckTyContext) {
+ // Ignore functions in trait implementations as they are usually forced by the trait definition.
+ //
+ // FIXME: ideally we would like to warn *if the complicated type can be simplified*, but it's hard
+ // to check.
+ if context.is_in_trait_impl {
+ return;
+ }
+
+ for input in decl.inputs {
+ self.check_ty(cx, input, context);
+ }
+
+ if let FnRetTy::Return(ty) = decl.output {
+ self.check_ty(cx, ty, context);
+ }
+ }
+
+ /// Recursively check for `TypePass` lints in the given type. Stop at the first
+ /// lint found.
+ ///
+ /// The parameter `is_local` distinguishes the context of the type.
+ fn check_ty(&mut self, cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, mut context: CheckTyContext) {
+ if hir_ty.span.from_expansion() {
+ return;
+ }
+
+ // Skip trait implementations; see issue #605.
+ if context.is_in_trait_impl {
+ return;
+ }
+
+ if !context.is_nested_call && type_complexity::check(cx, hir_ty, self.type_complexity_threshold) {
+ return;
+ }
+
+ match hir_ty.kind {
+ TyKind::Path(ref qpath) if !context.is_local => {
+ let hir_id = hir_ty.hir_id;
+ let res = cx.qpath_res(qpath, hir_id);
+ if let Some(def_id) = res.opt_def_id() {
+ if self.is_type_change_allowed(context) {
+ // All lints that are being checked in this block are guarded by
+ // the `avoid_breaking_exported_api` configuration. When adding a
+ // new lint, please also add the name to the configuration documentation
+ // in `clippy_lints::utils::conf.rs`
+
+ let mut triggered = false;
+ triggered |= box_collection::check(cx, hir_ty, qpath, def_id);
+ triggered |= redundant_allocation::check(cx, hir_ty, qpath, def_id);
+ triggered |= rc_buffer::check(cx, hir_ty, qpath, def_id);
+ triggered |= vec_box::check(cx, hir_ty, qpath, def_id, self.vec_box_size_threshold);
+ triggered |= option_option::check(cx, hir_ty, qpath, def_id);
+ triggered |= linked_list::check(cx, hir_ty, def_id);
+ triggered |= rc_mutex::check(cx, hir_ty, qpath, def_id);
+
+ if triggered {
+ return;
+ }
+ }
+ }
+ match *qpath {
+ QPath::Resolved(Some(ty), p) => {
+ context.is_nested_call = true;
+ self.check_ty(cx, ty, context);
+ for ty in p.segments.iter().flat_map(|seg| {
+ seg.args
+ .as_ref()
+ .map_or_else(|| [].iter(), |params| params.args.iter())
+ .filter_map(|arg| match arg {
+ GenericArg::Type(ty) => Some(ty),
+ _ => None,
+ })
+ }) {
+ self.check_ty(cx, ty, context);
+ }
+ },
+ QPath::Resolved(None, p) => {
+ context.is_nested_call = true;
+ for ty in p.segments.iter().flat_map(|seg| {
+ seg.args
+ .as_ref()
+ .map_or_else(|| [].iter(), |params| params.args.iter())
+ .filter_map(|arg| match arg {
+ GenericArg::Type(ty) => Some(ty),
+ _ => None,
+ })
+ }) {
+ self.check_ty(cx, ty, context);
+ }
+ },
+ QPath::TypeRelative(ty, seg) => {
+ context.is_nested_call = true;
+ self.check_ty(cx, ty, context);
+ if let Some(params) = seg.args {
+ for ty in params.args.iter().filter_map(|arg| match arg {
+ GenericArg::Type(ty) => Some(ty),
+ _ => None,
+ }) {
+ self.check_ty(cx, ty, context);
+ }
+ }
+ },
+ QPath::LangItem(..) => {},
+ }
+ },
+ TyKind::Ref(lt, ref mut_ty) => {
+ context.is_nested_call = true;
+ if !borrowed_box::check(cx, hir_ty, lt, mut_ty) {
+ self.check_ty(cx, mut_ty.ty, context);
+ }
+ },
+ TyKind::Slice(ty) | TyKind::Array(ty, _) | TyKind::Ptr(MutTy { ty, .. }) => {
+ context.is_nested_call = true;
+ self.check_ty(cx, ty, context);
+ },
+ TyKind::Tup(tys) => {
+ context.is_nested_call = true;
+ for ty in tys {
+ self.check_ty(cx, ty, context);
+ }
+ },
+ _ => {},
+ }
+ }
+
+ /// This function checks if the type is allowed to change in the current context
+ /// based on the `avoid_breaking_exported_api` configuration
+ fn is_type_change_allowed(&self, context: CheckTyContext) -> bool {
+ !(context.is_exported && self.avoid_breaking_exported_api)
+ }
+}
+
+#[allow(clippy::struct_excessive_bools)]
+#[derive(Clone, Copy, Default)]
+struct CheckTyContext {
+ is_in_trait_impl: bool,
+ /// `true` for types on local variables.
+ is_local: bool,
+ /// `true` for types that are part of the public API.
+ is_exported: bool,
+ is_nested_call: bool,
+}
--- /dev/null
- use rustc_hir::{Impl, ImplItem, ImplItemKind, ItemKind};
+use clippy_utils::diagnostics::span_lint_and_help;
++use clippy_utils::macros::root_macro_call_first_node;
+use clippy_utils::visitors::is_local_used;
+use if_chain::if_chain;
- "consider refactoring to a associated function",
++use rustc_hir::{Body, Impl, ImplItem, ImplItemKind, ItemKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
++use std::ops::ControlFlow;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks methods that contain a `self` argument but don't use it
+ ///
+ /// ### Why is this bad?
+ /// It may be clearer to define the method as an associated function instead
+ /// of an instance method if it doesn't require `self`.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// struct A;
+ /// impl A {
+ /// fn method(&self) {}
+ /// }
+ /// ```
+ ///
+ /// Could be written:
+ ///
+ /// ```rust,ignore
+ /// struct A;
+ /// impl A {
+ /// fn method() {}
+ /// }
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub UNUSED_SELF,
+ pedantic,
+ "methods that contain a `self` argument but don't use it"
+}
+
+pub struct UnusedSelf {
+ avoid_breaking_exported_api: bool,
+}
+
+impl_lint_pass!(UnusedSelf => [UNUSED_SELF]);
+
+impl UnusedSelf {
+ pub fn new(avoid_breaking_exported_api: bool) -> Self {
+ Self {
+ avoid_breaking_exported_api,
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for UnusedSelf {
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &ImplItem<'_>) {
+ if impl_item.span.from_expansion() {
+ return;
+ }
+ let parent = cx.tcx.hir().get_parent_item(impl_item.hir_id()).def_id;
+ let parent_item = cx.tcx.hir().expect_item(parent);
+ let assoc_item = cx.tcx.associated_item(impl_item.owner_id);
++ let contains_todo = |cx, body: &'_ Body<'_>| -> bool {
++ clippy_utils::visitors::for_each_expr(body.value, |e| {
++ if let Some(macro_call) = root_macro_call_first_node(cx, e) {
++ if cx.tcx.item_name(macro_call.def_id).as_str() == "todo" {
++ ControlFlow::Break(())
++ } else {
++ ControlFlow::Continue(())
++ }
++ } else {
++ ControlFlow::Continue(())
++ }
++ })
++ .is_some()
++ };
+ if_chain! {
+ if let ItemKind::Impl(Impl { of_trait: None, .. }) = parent_item.kind;
+ if assoc_item.fn_has_self_parameter;
+ if let ImplItemKind::Fn(.., body_id) = &impl_item.kind;
+ if !cx.effective_visibilities.is_exported(impl_item.owner_id.def_id) || !self.avoid_breaking_exported_api;
+ let body = cx.tcx.hir().body(*body_id);
+ if let [self_param, ..] = body.params;
+ if !is_local_used(cx, body, self_param.pat.hir_id);
++ if !contains_todo(cx, body);
+ then {
+ span_lint_and_help(
+ cx,
+ UNUSED_SELF,
+ self_param.span,
+ "unused `self` argument",
+ None,
++ "consider refactoring to an associated function",
+ );
+ }
+ }
+ }
+}
--- /dev/null
- match map.find_parent((hir_id)) {
+//! This lint is used to collect metadata about clippy lints. This metadata is exported as a json
+//! file and then used to generate the [clippy lint list](https://rust-lang.github.io/rust-clippy/master/index.html)
+//!
+//! This module and therefore the entire lint is guarded by a feature flag called `internal`
+//!
+//! The module transforms all lint names to ascii lowercase to ensure that we don't have mismatches
+//! during any comparison or mapping. (Please take care of this, it's not fun to spend time on such
+//! a simple mistake)
+
+use crate::renamed_lints::RENAMED_LINTS;
+use crate::utils::internal_lints::lint_without_lint_pass::{extract_clippy_version_value, is_lint_ref_type};
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::{match_type, walk_ptrs_ty_depth};
+use clippy_utils::{last_path_segment, match_def_path, match_function_call, match_path, paths};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::{
+ self as hir, def::DefKind, intravisit, intravisit::Visitor, Closure, ExprKind, Item, ItemKind, Mutability, QPath,
+};
+use rustc_lint::{CheckLintNameResult, LateContext, LateLintPass, LintContext, LintId};
+use rustc_middle::hir::nested_filter;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Loc, Span, Symbol};
+use serde::{ser::SerializeStruct, Serialize, Serializer};
+use std::collections::BinaryHeap;
+use std::fmt;
+use std::fmt::Write as _;
+use std::fs::{self, OpenOptions};
+use std::io::prelude::*;
+use std::path::Path;
+use std::path::PathBuf;
+use std::process::Command;
+
+/// This is the output file of the lint collector.
+const OUTPUT_FILE: &str = "../util/gh-pages/lints.json";
+/// These lints are excluded from the export.
+const BLACK_LISTED_LINTS: &[&str] = &["lint_author", "dump_hir", "internal_metadata_collector"];
+/// These groups will be ignored by the lint group matcher. This is useful for collections like
+/// `clippy::all`
+const IGNORED_LINT_GROUPS: [&str; 1] = ["clippy::all"];
+/// Lints within this group will be excluded from the collection. These groups
+/// have to be defined without the `clippy::` prefix.
+const EXCLUDED_LINT_GROUPS: [&str; 1] = ["internal"];
+/// Collected deprecated lint will be assigned to this group in the JSON output
+const DEPRECATED_LINT_GROUP_STR: &str = "deprecated";
+/// This is the lint level for deprecated lints that will be displayed in the lint list
+const DEPRECATED_LINT_LEVEL: &str = "none";
+/// This array holds Clippy's lint groups with their corresponding default lint level. The
+/// lint level for deprecated lints is set in `DEPRECATED_LINT_LEVEL`.
+const DEFAULT_LINT_LEVELS: &[(&str, &str)] = &[
+ ("correctness", "deny"),
+ ("suspicious", "warn"),
+ ("restriction", "allow"),
+ ("style", "warn"),
+ ("pedantic", "allow"),
+ ("complexity", "warn"),
+ ("perf", "warn"),
+ ("cargo", "allow"),
+ ("nursery", "allow"),
+];
+/// This prefix is in front of the lint groups in the lint store. The prefix will be trimmed
+/// to only keep the actual lint group in the output.
+const CLIPPY_LINT_GROUP_PREFIX: &str = "clippy::";
+const LINT_EMISSION_FUNCTIONS: [&[&str]; 7] = [
+ &["clippy_utils", "diagnostics", "span_lint"],
+ &["clippy_utils", "diagnostics", "span_lint_and_help"],
+ &["clippy_utils", "diagnostics", "span_lint_and_note"],
+ &["clippy_utils", "diagnostics", "span_lint_hir"],
+ &["clippy_utils", "diagnostics", "span_lint_and_sugg"],
+ &["clippy_utils", "diagnostics", "span_lint_and_then"],
+ &["clippy_utils", "diagnostics", "span_lint_hir_and_then"],
+];
+const SUGGESTION_DIAGNOSTIC_BUILDER_METHODS: [(&str, bool); 9] = [
+ ("span_suggestion", false),
+ ("span_suggestion_short", false),
+ ("span_suggestion_verbose", false),
+ ("span_suggestion_hidden", false),
+ ("tool_only_span_suggestion", false),
+ ("multipart_suggestion", true),
+ ("multipart_suggestions", true),
+ ("tool_only_multipart_suggestion", true),
+ ("span_suggestions", true),
+];
+const SUGGESTION_FUNCTIONS: [&[&str]; 2] = [
+ &["clippy_utils", "diagnostics", "multispan_sugg"],
+ &["clippy_utils", "diagnostics", "multispan_sugg_with_applicability"],
+];
+const DEPRECATED_LINT_TYPE: [&str; 3] = ["clippy_lints", "deprecated_lints", "ClippyDeprecatedLint"];
+
+/// The index of the applicability name of `paths::APPLICABILITY_VALUES`
+const APPLICABILITY_NAME_INDEX: usize = 2;
+/// This applicability will be set for unresolved applicability values.
+const APPLICABILITY_UNRESOLVED_STR: &str = "Unresolved";
+/// The version that will be displayed if none has been defined
+const VERSION_DEFAULT_STR: &str = "Unknown";
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Collects metadata about clippy lints for the website.
+ ///
+ /// This lint will be used to report problems of syntax parsing. You should hopefully never
+ /// see this but never say never I guess ^^
+ ///
+ /// ### Why is this bad?
+ /// This is not a bad thing but definitely a hacky way to do it. See
+ /// issue [#4310](https://github.com/rust-lang/rust-clippy/issues/4310) for a discussion
+ /// about the implementation.
+ ///
+ /// ### Known problems
+ /// Hopefully none. It would be pretty uncool to have a problem here :)
+ ///
+ /// ### Example output
+ /// ```json,ignore
+ /// {
+ /// "id": "internal_metadata_collector",
+ /// "id_span": {
+ /// "path": "clippy_lints/src/utils/internal_lints/metadata_collector.rs",
+ /// "line": 1
+ /// },
+ /// "group": "clippy::internal",
+ /// "docs": " ### What it does\nCollects metadata about clippy lints for the website. [...] "
+ /// }
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub INTERNAL_METADATA_COLLECTOR,
+ internal_warn,
+ "A busy bee collection metadata about lints"
+}
+
+impl_lint_pass!(MetadataCollector => [INTERNAL_METADATA_COLLECTOR]);
+
+#[allow(clippy::module_name_repetitions)]
+#[derive(Debug, Clone)]
+pub struct MetadataCollector {
+ /// All collected lints
+ ///
+ /// We use a Heap here to have the lints added in alphabetic order in the export
+ lints: BinaryHeap<LintMetadata>,
+ applicability_info: FxHashMap<String, ApplicabilityInfo>,
+ config: Vec<ClippyConfiguration>,
+ clippy_project_root: PathBuf,
+}
+
+impl MetadataCollector {
+ pub fn new() -> Self {
+ Self {
+ lints: BinaryHeap::<LintMetadata>::default(),
+ applicability_info: FxHashMap::<String, ApplicabilityInfo>::default(),
+ config: collect_configs(),
+ clippy_project_root: std::env::current_dir()
+ .expect("failed to get current dir")
+ .ancestors()
+ .nth(1)
+ .expect("failed to get project root")
+ .to_path_buf(),
+ }
+ }
+
+ fn get_lint_configs(&self, lint_name: &str) -> Option<String> {
+ self.config
+ .iter()
+ .filter(|config| config.lints.iter().any(|lint| lint == lint_name))
+ .map(ToString::to_string)
+ .reduce(|acc, x| acc + &x)
+ .map(|configurations| {
+ format!(
+ r#"
+### Configuration
+This lint has the following configuration variables:
+
+{configurations}
+"#
+ )
+ })
+ }
+}
+
+impl Drop for MetadataCollector {
+ /// You might ask: How hacky is this?
+ /// My answer: YES
+ fn drop(&mut self) {
+ // The metadata collector gets dropped twice, this makes sure that we only write
+ // when the list is full
+ if self.lints.is_empty() {
+ return;
+ }
+
+ let mut applicability_info = std::mem::take(&mut self.applicability_info);
+
+ // Mapping the final data
+ let mut lints = std::mem::take(&mut self.lints).into_sorted_vec();
+ for x in &mut lints {
+ x.applicability = Some(applicability_info.remove(&x.id).unwrap_or_default());
+ replace_produces(&x.id, &mut x.docs, &self.clippy_project_root);
+ }
+
+ collect_renames(&mut lints);
+
+ // Outputting
+ if Path::new(OUTPUT_FILE).exists() {
+ fs::remove_file(OUTPUT_FILE).unwrap();
+ }
+ let mut file = OpenOptions::new().write(true).create(true).open(OUTPUT_FILE).unwrap();
+ writeln!(file, "{}", serde_json::to_string_pretty(&lints).unwrap()).unwrap();
+ }
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct LintMetadata {
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: String,
+ docs: String,
+ version: String,
+ /// This field is only used in the output and will only be
+ /// mapped shortly before the actual output.
+ applicability: Option<ApplicabilityInfo>,
+}
+
+impl LintMetadata {
+ fn new(
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: &'static str,
+ version: String,
+ docs: String,
+ ) -> Self {
+ Self {
+ id,
+ id_span,
+ group,
+ level: level.to_string(),
+ version,
+ docs,
+ applicability: None,
+ }
+ }
+}
+
+fn replace_produces(lint_name: &str, docs: &mut String, clippy_project_root: &Path) {
+ let mut doc_lines = docs.lines().map(ToString::to_string).collect::<Vec<_>>();
+ let mut lines = doc_lines.iter_mut();
+
+ 'outer: loop {
+ // Find the start of the example
+
+ // ```rust
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start().starts_with("```rust") => {
+ if line.contains("ignore") || line.contains("no_run") {
+ // A {{produces}} marker may have been put on a ignored code block by mistake,
+ // just seek to the end of the code block and continue checking.
+ if lines.any(|line| line.trim_start().starts_with("```")) {
+ continue;
+ }
+
+ panic!("lint `{lint_name}` has an unterminated code block")
+ }
+
+ break;
+ },
+ Some(line) if line.trim_start() == "{{produces}}" => {
+ panic!("lint `{lint_name}` has marker {{{{produces}}}} with an ignored or missing code block")
+ },
+ Some(line) => {
+ let line = line.trim();
+ // These are the two most common markers of the corrections section
+ if line.eq_ignore_ascii_case("Use instead:") || line.eq_ignore_ascii_case("Could be written as:") {
+ break 'outer;
+ }
+ },
+ None => break 'outer,
+ }
+ }
+
+ // Collect the example
+ let mut example = Vec::new();
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start() == "```" => break,
+ Some(line) => example.push(line),
+ None => panic!("lint `{lint_name}` has an unterminated code block"),
+ }
+ }
+
+ // Find the {{produces}} and attempt to generate the output
+ loop {
+ match lines.next() {
+ Some(line) if line.is_empty() => {},
+ Some(line) if line.trim() == "{{produces}}" => {
+ let output = get_lint_output(lint_name, &example, clippy_project_root);
+ line.replace_range(
+ ..,
+ &format!(
+ "<details>\
+ <summary>Produces</summary>\n\
+ \n\
+ ```text\n\
+ {output}\n\
+ ```\n\
+ </details>"
+ ),
+ );
+
+ break;
+ },
+ // No {{produces}}, we can move on to the next example
+ Some(_) => break,
+ None => break 'outer,
+ }
+ }
+ }
+
+ *docs = cleanup_docs(&doc_lines);
+}
+
+fn get_lint_output(lint_name: &str, example: &[&mut String], clippy_project_root: &Path) -> String {
+ let dir = tempfile::tempdir().unwrap_or_else(|e| panic!("failed to create temp dir: {e}"));
+ let file = dir.path().join("lint_example.rs");
+
+ let mut source = String::new();
+ let unhidden = example
+ .iter()
+ .map(|line| line.trim_start().strip_prefix("# ").unwrap_or(line));
+
+ // Get any attributes
+ let mut lines = unhidden.peekable();
+ while let Some(line) = lines.peek() {
+ if line.starts_with("#!") {
+ source.push_str(line);
+ source.push('\n');
+ lines.next();
+ } else {
+ break;
+ }
+ }
+
+ let needs_main = !example.iter().any(|line| line.contains("fn main"));
+ if needs_main {
+ source.push_str("fn main() {\n");
+ }
+
+ for line in lines {
+ source.push_str(line);
+ source.push('\n');
+ }
+
+ if needs_main {
+ source.push_str("}\n");
+ }
+
+ if let Err(e) = fs::write(&file, &source) {
+ panic!("failed to write to `{}`: {e}", file.as_path().to_string_lossy());
+ }
+
+ let prefixed_name = format!("{CLIPPY_LINT_GROUP_PREFIX}{lint_name}");
+
+ let mut cmd = Command::new("cargo");
+
+ cmd.current_dir(clippy_project_root)
+ .env("CARGO_INCREMENTAL", "0")
+ .env("CLIPPY_ARGS", "")
+ .env("CLIPPY_DISABLE_DOCS_LINKS", "1")
+ // We need to disable this to enable all lints
+ .env("ENABLE_METADATA_COLLECTION", "0")
+ .args(["run", "--bin", "clippy-driver"])
+ .args(["--target-dir", "./clippy_lints/target"])
+ .args(["--", "--error-format=json"])
+ .args(["--edition", "2021"])
+ .arg("-Cdebuginfo=0")
+ .args(["-A", "clippy::all"])
+ .args(["-W", &prefixed_name])
+ .args(["-L", "./target/debug"])
+ .args(["-Z", "no-codegen"]);
+
+ let output = cmd
+ .arg(file.as_path())
+ .output()
+ .unwrap_or_else(|e| panic!("failed to run `{cmd:?}`: {e}"));
+
+ let tmp_file_path = file.to_string_lossy();
+ let stderr = std::str::from_utf8(&output.stderr).unwrap();
+ let msgs = stderr
+ .lines()
+ .filter(|line| line.starts_with('{'))
+ .map(|line| serde_json::from_str(line).unwrap())
+ .collect::<Vec<serde_json::Value>>();
+
+ let mut rendered = String::new();
+ let iter = msgs
+ .iter()
+ .filter(|msg| matches!(&msg["code"]["code"], serde_json::Value::String(s) if s == &prefixed_name));
+
+ for message in iter {
+ let rendered_part = message["rendered"].as_str().expect("rendered field should exist");
+ rendered.push_str(rendered_part);
+ }
+
+ if rendered.is_empty() {
+ let rendered: Vec<&str> = msgs.iter().filter_map(|msg| msg["rendered"].as_str()).collect();
+ let non_json: Vec<&str> = stderr.lines().filter(|line| !line.starts_with('{')).collect();
+ panic!(
+ "did not find lint `{lint_name}` in output of example, got:\n{}\n{}",
+ non_json.join("\n"),
+ rendered.join("\n")
+ );
+ }
+
+ // The reader doesn't need to see `/tmp/.tmpfiy2Qd/lint_example.rs` :)
+ rendered.trim_end().replace(&*tmp_file_path, "lint_example.rs")
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct SerializableSpan {
+ path: String,
+ line: usize,
+}
+
+impl fmt::Display for SerializableSpan {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}:{}", self.path.rsplit('/').next().unwrap_or_default(), self.line)
+ }
+}
+
+impl SerializableSpan {
+ fn from_item(cx: &LateContext<'_>, item: &Item<'_>) -> Self {
+ Self::from_span(cx, item.ident.span)
+ }
+
+ fn from_span(cx: &LateContext<'_>, span: Span) -> Self {
+ let loc: Loc = cx.sess().source_map().lookup_char_pos(span.lo());
+
+ Self {
+ path: format!("{}", loc.file.name.prefer_remapped()),
+ line: loc.line,
+ }
+ }
+}
+
+#[derive(Debug, Clone, Default, PartialEq, Eq, PartialOrd, Ord)]
+struct ApplicabilityInfo {
+ /// Indicates if any of the lint emissions uses multiple spans. This is related to
+ /// [rustfix#141](https://github.com/rust-lang/rustfix/issues/141) as such suggestions can
+ /// currently not be applied automatically.
+ is_multi_part_suggestion: bool,
+ applicability: Option<usize>,
+}
+
+impl Serialize for ApplicabilityInfo {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: Serializer,
+ {
+ let mut s = serializer.serialize_struct("ApplicabilityInfo", 2)?;
+ s.serialize_field("is_multi_part_suggestion", &self.is_multi_part_suggestion)?;
+ if let Some(index) = self.applicability {
+ s.serialize_field(
+ "applicability",
+ &paths::APPLICABILITY_VALUES[index][APPLICABILITY_NAME_INDEX],
+ )?;
+ } else {
+ s.serialize_field("applicability", APPLICABILITY_UNRESOLVED_STR)?;
+ }
+ s.end()
+ }
+}
+
+// ==================================================================
+// Configuration
+// ==================================================================
+#[derive(Debug, Clone, Default)]
+pub struct ClippyConfiguration {
+ name: String,
+ config_type: &'static str,
+ default: String,
+ lints: Vec<String>,
+ doc: String,
+ #[allow(dead_code)]
+ deprecation_reason: Option<&'static str>,
+}
+
+impl ClippyConfiguration {
+ pub fn new(
+ name: &'static str,
+ config_type: &'static str,
+ default: String,
+ doc_comment: &'static str,
+ deprecation_reason: Option<&'static str>,
+ ) -> Self {
+ let (lints, doc) = parse_config_field_doc(doc_comment)
+ .unwrap_or_else(|| (vec![], "[ERROR] MALFORMED DOC COMMENT".to_string()));
+
+ Self {
+ name: to_kebab(name),
+ lints,
+ doc,
+ config_type,
+ default,
+ deprecation_reason,
+ }
+ }
+}
+
+fn collect_configs() -> Vec<ClippyConfiguration> {
+ crate::utils::conf::metadata::get_configuration_metadata()
+}
+
+/// This parses the field documentation of the config struct.
+///
+/// ```rust, ignore
+/// parse_config_field_doc(cx, "Lint: LINT_NAME_1, LINT_NAME_2. Papa penguin, papa penguin")
+/// ```
+///
+/// Would yield:
+/// ```rust, ignore
+/// Some(["lint_name_1", "lint_name_2"], "Papa penguin, papa penguin")
+/// ```
+fn parse_config_field_doc(doc_comment: &str) -> Option<(Vec<String>, String)> {
+ const DOC_START: &str = " Lint: ";
+ if_chain! {
+ if doc_comment.starts_with(DOC_START);
+ if let Some(split_pos) = doc_comment.find('.');
+ then {
+ let mut doc_comment = doc_comment.to_string();
+ let mut documentation = doc_comment.split_off(split_pos);
+
+ // Extract lints
+ doc_comment.make_ascii_lowercase();
+ let lints: Vec<String> = doc_comment
+ .split_off(DOC_START.len())
+ .split(", ")
+ .map(str::to_string)
+ .collect();
+
+ // Format documentation correctly
+ // split off leading `.` from lint name list and indent for correct formatting
+ documentation = documentation.trim_start_matches('.').trim().replace("\n ", "\n ");
+
+ Some((lints, documentation))
+ } else {
+ None
+ }
+ }
+}
+
+/// Transforms a given `snake_case_string` to a tasty `kebab-case-string`
+fn to_kebab(config_name: &str) -> String {
+ config_name.replace('_', "-")
+}
+
+impl fmt::Display for ClippyConfiguration {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
+ writeln!(
+ f,
+ "* `{}`: `{}`(defaults to `{}`): {}",
+ self.name, self.config_type, self.default, self.doc
+ )
+ }
+}
+
+// ==================================================================
+// Lint pass
+// ==================================================================
+impl<'hir> LateLintPass<'hir> for MetadataCollector {
+ /// Collecting lint declarations like:
+ /// ```rust, ignore
+ /// declare_clippy_lint! {
+ /// /// ### What it does
+ /// /// Something IDK.
+ /// pub SOME_LINT,
+ /// internal,
+ /// "Who am I?"
+ /// }
+ /// ```
+ fn check_item(&mut self, cx: &LateContext<'hir>, item: &'hir Item<'_>) {
+ if let ItemKind::Static(ty, Mutability::Not, _) = item.kind {
+ // Normal lint
+ if_chain! {
+ // item validation
+ if is_lint_ref_type(cx, ty);
+ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // metadata extraction
+ if let Some((group, level)) = get_lint_group_and_level_or_lint(cx, &lint_name, item);
+ if let Some(mut raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ if let Some(configuration_section) = self.get_lint_configs(&lint_name) {
+ raw_docs.push_str(&configuration_section);
+ }
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ group,
+ level,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+
+ if_chain! {
+ if is_deprecated_lint(cx, ty);
+ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // Metadata the little we can get from a deprecated lint
+ if let Some(raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ DEPRECATED_LINT_GROUP_STR.to_string(),
+ DEPRECATED_LINT_LEVEL,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+ }
+ }
+
+ /// Collecting constant applicability from the actual lint emissions
+ ///
+ /// Example:
+ /// ```rust, ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// SOME_LINT,
+ /// item.span,
+ /// "Le lint message",
+ /// "Here comes help:",
+ /// "#![allow(clippy::all)]",
+ /// Applicability::MachineApplicable, // <-- Extracts this constant value
+ /// );
+ /// ```
+ fn check_expr(&mut self, cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) {
+ if let Some(args) = match_lint_emission(cx, expr) {
+ let emission_info = extract_emission_info(cx, args);
+ if emission_info.is_empty() {
+ // See:
+ // - src/misc.rs:734:9
+ // - src/methods/mod.rs:3545:13
+ // - src/methods/mod.rs:3496:13
+ // We are basically unable to resolve the lint name itself.
+ return;
+ }
+
+ for (lint_name, applicability, is_multi_part) in emission_info {
+ let app_info = self.applicability_info.entry(lint_name).or_default();
+ app_info.applicability = applicability;
+ app_info.is_multi_part_suggestion = is_multi_part;
+ }
+ }
+ }
+}
+
+// ==================================================================
+// Lint definition extraction
+// ==================================================================
+fn sym_to_string(sym: Symbol) -> String {
+ sym.as_str().to_string()
+}
+
+fn extract_attr_docs_or_lint(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ extract_attr_docs(cx, item).or_else(|| {
+ lint_collection_error_item(cx, item, "could not collect the lint documentation");
+ None
+ })
+}
+
+/// This function collects all documentation that has been added to an item using
+/// `#[doc = r""]` attributes. Several attributes are aggravated using line breaks
+///
+/// ```ignore
+/// #[doc = r"Hello world!"]
+/// #[doc = r"=^.^="]
+/// struct SomeItem {}
+/// ```
+///
+/// Would result in `Hello world!\n=^.^=\n`
+fn extract_attr_docs(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let mut lines = attrs.iter().filter_map(ast::Attribute::doc_str);
+
+ if let Some(line) = lines.next() {
+ let raw_docs = lines.fold(String::from(line.as_str()) + "\n", |s, line| s + line.as_str() + "\n");
+ return Some(raw_docs);
+ }
+
+ None
+}
+
+/// This function may modify the doc comment to ensure that the string can be displayed using a
+/// markdown viewer in Clippy's lint list. The following modifications could be applied:
+/// * Removal of leading space after a new line. (Important to display tables)
+/// * Ensures that code blocks only contain language information
+fn cleanup_docs(docs_collection: &Vec<String>) -> String {
+ let mut in_code_block = false;
+ let mut is_code_block_rust = false;
+
+ let mut docs = String::new();
+ for line in docs_collection {
+ // Rustdoc hides code lines starting with `# ` and this removes them from Clippy's lint list :)
+ if is_code_block_rust && line.trim_start().starts_with("# ") {
+ continue;
+ }
+
+ // The line should be represented in the lint list, even if it's just an empty line
+ docs.push('\n');
+ if let Some(info) = line.trim_start().strip_prefix("```") {
+ in_code_block = !in_code_block;
+ is_code_block_rust = false;
+ if in_code_block {
+ let lang = info
+ .trim()
+ .split(',')
+ // remove rustdoc directives
+ .find(|&s| !matches!(s, "" | "ignore" | "no_run" | "should_panic"))
+ // if no language is present, fill in "rust"
+ .unwrap_or("rust");
+ docs.push_str("```");
+ docs.push_str(lang);
+
+ is_code_block_rust = lang == "rust";
+ continue;
+ }
+ }
+ // This removes the leading space that the macro translation introduces
+ if let Some(stripped_doc) = line.strip_prefix(' ') {
+ docs.push_str(stripped_doc);
+ } else if !line.is_empty() {
+ docs.push_str(line);
+ }
+ }
+
+ docs
+}
+
+fn get_lint_version(cx: &LateContext<'_>, item: &Item<'_>) -> String {
+ extract_clippy_version_value(cx, item).map_or_else(
+ || VERSION_DEFAULT_STR.to_string(),
+ |version| version.as_str().to_string(),
+ )
+}
+
+fn get_lint_group_and_level_or_lint(
+ cx: &LateContext<'_>,
+ lint_name: &str,
+ item: &Item<'_>,
+) -> Option<(String, &'static str)> {
+ let result = cx.lint_store.check_lint_name(
+ lint_name,
+ Some(sym::clippy),
+ &std::iter::once(Ident::with_dummy_span(sym::clippy)).collect(),
+ );
+ if let CheckLintNameResult::Tool(Ok(lint_lst)) = result {
+ if let Some(group) = get_lint_group(cx, lint_lst[0]) {
+ if EXCLUDED_LINT_GROUPS.contains(&group.as_str()) {
+ return None;
+ }
+
+ if let Some(level) = get_lint_level_from_group(&group) {
+ Some((group, level))
+ } else {
+ lint_collection_error_item(
+ cx,
+ item,
+ &format!("Unable to determine lint level for found group `{group}`"),
+ );
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to determine lint group");
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to find lint in lint_store");
+ None
+ }
+}
+
+fn get_lint_group(cx: &LateContext<'_>, lint_id: LintId) -> Option<String> {
+ for (group_name, lints, _) in cx.lint_store.get_lint_groups() {
+ if IGNORED_LINT_GROUPS.contains(&group_name) {
+ continue;
+ }
+
+ if lints.iter().any(|group_lint| *group_lint == lint_id) {
+ let group = group_name.strip_prefix(CLIPPY_LINT_GROUP_PREFIX).unwrap_or(group_name);
+ return Some((*group).to_string());
+ }
+ }
+
+ None
+}
+
+fn get_lint_level_from_group(lint_group: &str) -> Option<&'static str> {
+ DEFAULT_LINT_LEVELS
+ .iter()
+ .find_map(|(group_name, group_level)| (*group_name == lint_group).then_some(*group_level))
+}
+
+pub(super) fn is_deprecated_lint(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(ref path) = ty.kind {
+ if let hir::def::Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, ty.hir_id) {
+ return match_def_path(cx, def_id, &DEPRECATED_LINT_TYPE);
+ }
+ }
+
+ false
+}
+
+fn collect_renames(lints: &mut Vec<LintMetadata>) {
+ for lint in lints {
+ let mut collected = String::new();
+ let mut names = vec![lint.id.clone()];
+
+ loop {
+ if let Some(lint_name) = names.pop() {
+ for (k, v) in RENAMED_LINTS {
+ if_chain! {
+ if let Some(name) = v.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ if name == lint_name;
+ if let Some(past_name) = k.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ then {
+ writeln!(collected, "* `{past_name}`").unwrap();
+ names.push(past_name.to_string());
+ }
+ }
+ }
+
+ continue;
+ }
+
+ break;
+ }
+
+ if !collected.is_empty() {
+ write!(
+ &mut lint.docs,
+ r#"
+### Past names
+
+{collected}
+"#
+ )
+ .unwrap();
+ }
+ }
+}
+
+// ==================================================================
+// Lint emission
+// ==================================================================
+fn lint_collection_error_item(cx: &LateContext<'_>, item: &Item<'_>, message: &str) {
+ span_lint(
+ cx,
+ INTERNAL_METADATA_COLLECTOR,
+ item.ident.span,
+ &format!("metadata collection error for `{}`: {message}", item.ident.name),
+ );
+}
+
+// ==================================================================
+// Applicability
+// ==================================================================
+/// This function checks if a given expression is equal to a simple lint emission function call.
+/// It will return the function arguments if the emission matched any function.
+fn match_lint_emission<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) -> Option<&'hir [hir::Expr<'hir>]> {
+ LINT_EMISSION_FUNCTIONS
+ .iter()
+ .find_map(|emission_fn| match_function_call(cx, expr, emission_fn))
+}
+
+fn take_higher_applicability(a: Option<usize>, b: Option<usize>) -> Option<usize> {
+ a.map_or(b, |a| a.max(b.unwrap_or_default()).into())
+}
+
+fn extract_emission_info<'hir>(
+ cx: &LateContext<'hir>,
+ args: &'hir [hir::Expr<'hir>],
+) -> Vec<(String, Option<usize>, bool)> {
+ let mut lints = Vec::new();
+ let mut applicability = None;
+ let mut multi_part = false;
+
+ for arg in args {
+ let (arg_ty, _) = walk_ptrs_ty_depth(cx.typeck_results().expr_ty(arg));
+
+ if match_type(cx, arg_ty, &paths::LINT) {
+ // If we found the lint arg, extract the lint name
+ let mut resolved_lints = resolve_lints(cx, arg);
+ lints.append(&mut resolved_lints);
+ } else if match_type(cx, arg_ty, &paths::APPLICABILITY) {
+ applicability = resolve_applicability(cx, arg);
+ } else if arg_ty.is_closure() {
+ multi_part |= check_is_multi_part(cx, arg);
+ applicability = applicability.or_else(|| resolve_applicability(cx, arg));
+ }
+ }
+
+ lints
+ .into_iter()
+ .map(|lint_name| (lint_name, applicability, multi_part))
+ .collect()
+}
+
+/// Resolves the possible lints that this expression could reference
+fn resolve_lints<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
+ let mut resolver = LintResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.lints
+}
+
+/// This function tries to resolve the linked applicability to the given expression.
+fn resolve_applicability<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
+ let mut resolver = ApplicabilityResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.complete()
+}
+
+fn check_is_multi_part<'hir>(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
+ if let ExprKind::Closure(&Closure { body, .. }) = closure_expr.kind {
+ let mut scanner = IsMultiSpanScanner::new(cx);
+ intravisit::walk_body(&mut scanner, cx.tcx.hir().body(body));
+ return scanner.is_multi_part();
+ } else if let Some(local) = get_parent_local(cx, closure_expr) {
+ if let Some(local_init) = local.init {
+ return check_is_multi_part(cx, local_init);
+ }
+ }
+
+ false
+}
+
+struct LintResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ lints: Vec<String>,
+}
+
+impl<'a, 'hir> LintResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ lints: Vec::<String>::default(),
+ }
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for LintResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ if_chain! {
+ if let ExprKind::Path(qpath) = &expr.kind;
+ if let QPath::Resolved(_, path) = qpath;
+
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+ if match_type(self.cx, expr_ty, &paths::LINT);
+ then {
+ if let hir::def::Res::Def(DefKind::Static(..), _) = path.res {
+ let lint_name = last_path_segment(qpath).ident.name;
+ self.lints.push(sym_to_string(lint_name).to_ascii_lowercase());
+ } else if let Some(local) = get_parent_local(self.cx, expr) {
+ if let Some(local_init) = local.init {
+ intravisit::walk_expr(self, local_init);
+ }
+ }
+ }
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct ApplicabilityResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ /// This is the index of highest `Applicability` for `paths::APPLICABILITY_VALUES`
+ applicability_index: Option<usize>,
+}
+
+impl<'a, 'hir> ApplicabilityResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ applicability_index: None,
+ }
+ }
+
+ fn add_new_index(&mut self, new_index: usize) {
+ self.applicability_index = take_higher_applicability(self.applicability_index, Some(new_index));
+ }
+
+ fn complete(self) -> Option<usize> {
+ self.applicability_index
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_path(&mut self, path: &hir::Path<'hir>, _id: hir::HirId) {
+ for (index, enum_value) in paths::APPLICABILITY_VALUES.iter().enumerate() {
+ if match_path(path, enum_value) {
+ self.add_new_index(index);
+ return;
+ }
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+
+ if_chain! {
+ if match_type(self.cx, expr_ty, &paths::APPLICABILITY);
+ if let Some(local) = get_parent_local(self.cx, expr);
+ if let Some(local_init) = local.init;
+ then {
+ intravisit::walk_expr(self, local_init);
+ }
+ };
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This returns the parent local node if the expression is a reference one
+fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
+ if let ExprKind::Path(QPath::Resolved(_, path)) = expr.kind {
+ if let hir::def::Res::Local(local_hir) = path.res {
+ return get_parent_local_hir_id(cx, local_hir);
+ }
+ }
+
+ None
+}
+
+fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
+ let map = cx.tcx.hir();
+
++ match map.find_parent(hir_id) {
+ Some(hir::Node::Local(local)) => Some(local),
+ Some(hir::Node::Pat(pattern)) => get_parent_local_hir_id(cx, pattern.hir_id),
+ _ => None,
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct IsMultiSpanScanner<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ suggestion_count: usize,
+}
+
+impl<'a, 'hir> IsMultiSpanScanner<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ suggestion_count: 0,
+ }
+ }
+
+ /// Add a new single expression suggestion to the counter
+ fn add_single_span_suggestion(&mut self) {
+ self.suggestion_count += 1;
+ }
+
+ /// Signals that a suggestion with possible multiple spans was found
+ fn add_multi_part_suggestion(&mut self) {
+ self.suggestion_count += 2;
+ }
+
+ /// Checks if the suggestions include multiple spans
+ fn is_multi_part(&self) -> bool {
+ self.suggestion_count > 1
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ // Early return if the lint is already multi span
+ if self.is_multi_part() {
+ return;
+ }
+
+ match &expr.kind {
+ ExprKind::Call(fn_expr, _args) => {
+ let found_function = SUGGESTION_FUNCTIONS
+ .iter()
+ .any(|func_path| match_function_call(self.cx, fn_expr, func_path).is_some());
+ if found_function {
+ // These functions are all multi part suggestions
+ self.add_single_span_suggestion();
+ }
+ },
+ ExprKind::MethodCall(path, recv, _, _arg_span) => {
+ let (self_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(recv));
+ if match_type(self.cx, self_ty, &paths::DIAGNOSTIC_BUILDER) {
+ let called_method = path.ident.name.as_str().to_string();
+ for (method_name, is_multi_part) in &SUGGESTION_DIAGNOSTIC_BUILDER_METHODS {
+ if *method_name == called_method {
+ if *is_multi_part {
+ self.add_multi_part_suggestion();
+ } else {
+ self.add_single_span_suggestion();
+ }
+ break;
+ }
+ }
+ }
+ },
+ _ => {},
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
--- /dev/null
- pub struct ContainsName {
+#![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;
++// The `rustc_driver` crate seems to be required in order to use the `rust_ast` crate.
++#[allow(unused_extern_crates)]
++extern crate rustc_driver;
+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;
+
++use rustc_middle::hir::nested_filter;
++
+#[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.parent_id(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,
+ }
+}
+
- impl<'tcx> Visitor<'tcx> for ContainsName {
++pub struct ContainsName<'a, 'tcx> {
++ pub cx: &'a LateContext<'tcx>,
+ pub name: Symbol,
+ pub result: bool,
+}
+
- pub fn contains_name(name: Symbol, expr: &Expr<'_>) -> bool {
- let mut cn = ContainsName { name, result: false };
++impl<'a, 'tcx> Visitor<'tcx> for ContainsName<'a, 'tcx> {
++ type NestedFilter = nested_filter::OnlyBodies;
++
+ fn visit_name(&mut self, name: Symbol) {
+ if self.name == name {
+ self.result = true;
+ }
+ }
++
++ fn nested_visit_map(&mut self) -> Self::Map {
++ self.cx.tcx.hir()
++ }
+}
+
+/// Checks if an `Expr` contains a certain name.
++pub fn contains_name<'tcx>(name: Symbol, expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) -> bool {
++ let mut cn = ContainsName {
++ name,
++ result: false,
++ cx,
++ };
+ 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().find_parent(id)
+}
+
+/// 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,
+ }
+}
+
++/// Gets the enclosing block, if any.
+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_parent(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 unary operators of an expression. Returns the underlying expression and the number
++/// of operators removed.
++pub fn peel_hir_expr_unary<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
++ let mut count: usize = 0;
++ let mut curr_expr = expr;
++ while let ExprKind::Unary(_, local_expr) = curr_expr.kind {
++ count = count.wrapping_add(1);
++ curr_expr = local_expr;
++ }
++ (curr_expr, count)
++}
++
+/// 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::Ref(_, 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
- use super::possible_origin::PossibleOriginVisitor;
++use super::{possible_origin::PossibleOriginVisitor, transitive_relation::TransitiveRelation};
+use crate::ty::is_copy;
- use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
++use rustc_data_structures::fx::FxHashMap;
+use rustc_index::bit_set::{BitSet, HybridBitSet};
+use rustc_lint::LateContext;
- use rustc_middle::mir::{
- self, visit::Visitor as _, BasicBlock, Local, Location, Mutability, Statement, StatementKind, Terminator,
- };
- use rustc_middle::ty::{self, visit::TypeVisitor, TyCtxt};
- use rustc_mir_dataflow::{
- fmt::DebugWithContext, impls::MaybeStorageLive, lattice::JoinSemiLattice, Analysis, AnalysisDomain,
- CallReturnPlaces, ResultsCursor,
- };
++use rustc_middle::mir::{self, visit::Visitor as _, Mutability};
++use rustc_middle::ty::{self, visit::TypeVisitor};
++use rustc_mir_dataflow::{impls::MaybeStorageLive, Analysis, ResultsCursor};
+use std::borrow::Cow;
+use std::ops::ControlFlow;
+
+/// Collects the possible borrowers of each local.
+/// For example, `b = &a; c = &a;` will make `b` and (transitively) `c`
+/// possible borrowers of `a`.
+#[allow(clippy::module_name_repetitions)]
- struct PossibleBorrowerAnalysis<'b, 'tcx> {
- tcx: TyCtxt<'tcx>,
++struct PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ possible_borrower: TransitiveRelation,
+ body: &'b mir::Body<'tcx>,
++ cx: &'a LateContext<'tcx>,
+ possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
+}
+
- #[derive(Clone, Debug, Eq, PartialEq)]
- struct PossibleBorrowerState {
- map: FxIndexMap<Local, BitSet<Local>>,
- domain_size: usize,
- }
-
- impl PossibleBorrowerState {
- fn new(domain_size: usize) -> Self {
++impl<'a, 'b, 'tcx> PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ fn new(
++ cx: &'a LateContext<'tcx>,
++ body: &'b mir::Body<'tcx>,
++ possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
++ ) -> Self {
+ Self {
- map: FxIndexMap::default(),
- domain_size,
++ possible_borrower: TransitiveRelation::default(),
++ cx,
++ body,
++ possible_origin,
+ }
+ }
+
- #[allow(clippy::similar_names)]
- fn add(&mut self, borrowed: Local, borrower: Local) {
- self.map
- .entry(borrowed)
- .or_insert(BitSet::new_empty(self.domain_size))
- .insert(borrower);
- }
- }
-
- impl<C> DebugWithContext<C> for PossibleBorrowerState {
- fn fmt_with(&self, _ctxt: &C, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
- <_ as std::fmt::Debug>::fmt(self, f)
- }
- fn fmt_diff_with(&self, _old: &Self, _ctxt: &C, _f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
- unimplemented!()
- }
- }
++ fn into_map(
++ self,
++ cx: &'a LateContext<'tcx>,
++ maybe_live: ResultsCursor<'b, 'tcx, MaybeStorageLive<'tcx>>,
++ ) -> PossibleBorrowerMap<'b, 'tcx> {
++ let mut map = FxHashMap::default();
++ for row in (1..self.body.local_decls.len()).map(mir::Local::from_usize) {
++ if is_copy(cx, self.body.local_decls[row].ty) {
++ continue;
++ }
+
- impl JoinSemiLattice for PossibleBorrowerState {
- fn join(&mut self, other: &Self) -> bool {
- let mut changed = false;
- for (&borrowed, borrowers) in other.map.iter() {
++ let mut borrowers = self.possible_borrower.reachable_from(row, self.body.local_decls.len());
++ borrowers.remove(mir::Local::from_usize(0));
+ if !borrowers.is_empty() {
- changed |= self
- .map
- .entry(borrowed)
- .or_insert(BitSet::new_empty(self.domain_size))
- .union(borrowers);
++ map.insert(row, borrowers);
+ }
+ }
- changed
- }
- }
-
- impl<'b, 'tcx> AnalysisDomain<'tcx> for PossibleBorrowerAnalysis<'b, 'tcx> {
- type Domain = PossibleBorrowerState;
-
- const NAME: &'static str = "possible_borrower";
-
- fn bottom_value(&self, body: &mir::Body<'tcx>) -> Self::Domain {
- PossibleBorrowerState::new(body.local_decls.len())
- }
-
- fn initialize_start_block(&self, _body: &mir::Body<'tcx>, _entry_set: &mut Self::Domain) {}
- }
+
- impl<'b, 'tcx> PossibleBorrowerAnalysis<'b, 'tcx> {
- fn new(
- tcx: TyCtxt<'tcx>,
- body: &'b mir::Body<'tcx>,
- possible_origin: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
- ) -> Self {
- Self {
- tcx,
- body,
- possible_origin,
++ let bs = BitSet::new_empty(self.body.local_decls.len());
++ PossibleBorrowerMap {
++ map,
++ maybe_live,
++ bitset: (bs.clone(), bs),
+ }
+ }
+}
+
- impl<'b, 'tcx> Analysis<'tcx> for PossibleBorrowerAnalysis<'b, 'tcx> {
- fn apply_call_return_effect(
- &self,
- _state: &mut Self::Domain,
- _block: BasicBlock,
- _return_places: CallReturnPlaces<'_, 'tcx>,
- ) {
- }
-
- fn apply_statement_effect(&self, state: &mut Self::Domain, statement: &Statement<'tcx>, _location: Location) {
- if let StatementKind::Assign(box (place, rvalue)) = &statement.kind {
- let lhs = place.local;
- match rvalue {
- mir::Rvalue::Ref(_, _, borrowed) => {
- state.add(borrowed.local, lhs);
- },
- other => {
- if ContainsRegion
- .visit_ty(place.ty(&self.body.local_decls, self.tcx).ty)
- .is_continue()
- {
- return;
++impl<'a, 'b, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'b, 'tcx> {
++ fn visit_assign(&mut self, place: &mir::Place<'tcx>, rvalue: &mir::Rvalue<'_>, _location: mir::Location) {
++ let lhs = place.local;
++ match rvalue {
++ mir::Rvalue::Ref(_, _, borrowed) => {
++ self.possible_borrower.add(borrowed.local, lhs);
++ },
++ other => {
++ if ContainsRegion
++ .visit_ty(place.ty(&self.body.local_decls, self.cx.tcx).ty)
++ .is_continue()
++ {
++ return;
++ }
++ rvalue_locals(other, |rhs| {
++ if lhs != rhs {
++ self.possible_borrower.add(rhs, lhs);
+ }
- rvalue_locals(other, |rhs| {
- if lhs != rhs {
- state.add(rhs, lhs);
- }
- });
- },
- }
++ });
++ },
+ }
+ }
+
- fn apply_terminator_effect(&self, state: &mut Self::Domain, terminator: &Terminator<'tcx>, _location: Location) {
++ fn visit_terminator(&mut self, terminator: &mir::Terminator<'_>, _loc: mir::Location) {
+ if let mir::TerminatorKind::Call {
+ args,
+ destination: mir::Place { local: dest, .. },
+ ..
+ } = &terminator.kind
+ {
+ // TODO add doc
+ // If the call returns something with lifetimes,
+ // let's conservatively assume the returned value contains lifetime of all the arguments.
+ // For example, given `let y: Foo<'a> = foo(x)`, `y` is considered to be a possible borrower of `x`.
+
+ let mut immutable_borrowers = vec![];
+ let mut mutable_borrowers = vec![];
+
+ for op in args {
+ match op {
+ mir::Operand::Copy(p) | mir::Operand::Move(p) => {
+ if let ty::Ref(_, _, Mutability::Mut) = self.body.local_decls[p.local].ty.kind() {
+ mutable_borrowers.push(p.local);
+ } else {
+ immutable_borrowers.push(p.local);
+ }
+ },
+ mir::Operand::Constant(..) => (),
+ }
+ }
+
+ let mut mutable_variables: Vec<mir::Local> = mutable_borrowers
+ .iter()
+ .filter_map(|r| self.possible_origin.get(r))
+ .flat_map(HybridBitSet::iter)
+ .collect();
+
+ if ContainsRegion.visit_ty(self.body.local_decls[*dest].ty).is_break() {
+ mutable_variables.push(*dest);
+ }
+
+ for y in mutable_variables {
+ for x in &immutable_borrowers {
- state.add(*x, y);
++ self.possible_borrower.add(*x, y);
+ }
+ for x in &mutable_borrowers {
- state.add(*x, y);
++ self.possible_borrower.add(*x, y);
+ }
+ }
+ }
+ }
+}
+
+struct ContainsRegion;
+
+impl TypeVisitor<'_> for ContainsRegion {
+ type BreakTy = ();
+
+ fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<Self::BreakTy> {
+ ControlFlow::BREAK
+ }
+}
+
+fn rvalue_locals(rvalue: &mir::Rvalue<'_>, mut visit: impl FnMut(mir::Local)) {
+ use rustc_middle::mir::Rvalue::{Aggregate, BinaryOp, Cast, CheckedBinaryOp, Repeat, UnaryOp, Use};
+
+ let mut visit_op = |op: &mir::Operand<'_>| match op {
+ mir::Operand::Copy(p) | mir::Operand::Move(p) => visit(p.local),
+ mir::Operand::Constant(..) => (),
+ };
+
+ match rvalue {
+ Use(op) | Repeat(op, _) | Cast(_, op, _) | UnaryOp(_, op) => visit_op(op),
+ Aggregate(_, ops) => ops.iter().for_each(visit_op),
+ BinaryOp(_, box (lhs, rhs)) | CheckedBinaryOp(_, box (lhs, rhs)) => {
+ visit_op(lhs);
+ visit_op(rhs);
+ },
+ _ => (),
+ }
+}
+
- /// Result of `PossibleBorrowerAnalysis`.
++/// Result of `PossibleBorrowerVisitor`.
+#[allow(clippy::module_name_repetitions)]
+pub struct PossibleBorrowerMap<'b, 'tcx> {
- body: &'b mir::Body<'tcx>,
- possible_borrower: ResultsCursor<'b, 'tcx, PossibleBorrowerAnalysis<'b, 'tcx>>,
- maybe_live: ResultsCursor<'b, 'tcx, MaybeStorageLive<'b>>,
- pushed: BitSet<Local>,
- stack: Vec<Local>,
++ /// Mapping `Local -> its possible borrowers`
++ pub map: FxHashMap<mir::Local, HybridBitSet<mir::Local>>,
++ maybe_live: ResultsCursor<'b, 'tcx, MaybeStorageLive<'tcx>>,
++ // Caches to avoid allocation of `BitSet` on every query
++ pub bitset: (BitSet<mir::Local>, BitSet<mir::Local>),
+}
+
- impl<'b, 'tcx> PossibleBorrowerMap<'b, 'tcx> {
- pub fn new(cx: &LateContext<'tcx>, mir: &'b mir::Body<'tcx>) -> Self {
++impl<'a, 'b, 'tcx> PossibleBorrowerMap<'b, 'tcx> {
++ pub fn new(cx: &'a LateContext<'tcx>, mir: &'b mir::Body<'tcx>) -> Self {
+ let possible_origin = {
+ let mut vis = PossibleOriginVisitor::new(mir);
+ vis.visit_body(mir);
+ vis.into_map(cx)
+ };
- let possible_borrower = PossibleBorrowerAnalysis::new(cx.tcx, mir, possible_origin)
++ let maybe_storage_live_result = MaybeStorageLive::new(Cow::Owned(BitSet::new_empty(mir.local_decls.len())))
+ .into_engine(cx.tcx, mir)
- .pass_name("possible_borrower")
++ .pass_name("redundant_clone")
+ .iterate_to_fixpoint()
+ .into_results_cursor(mir);
- let maybe_live = MaybeStorageLive::new(Cow::Owned(BitSet::new_empty(mir.local_decls.len())))
- .into_engine(cx.tcx, mir)
- .pass_name("possible_borrower")
- .iterate_to_fixpoint()
- .into_results_cursor(mir);
- PossibleBorrowerMap {
- body: mir,
- possible_borrower,
- maybe_live,
- pushed: BitSet::new_empty(mir.local_decls.len()),
- stack: Vec::with_capacity(mir.local_decls.len()),
- }
++ let mut vis = PossibleBorrowerVisitor::new(cx, mir, possible_origin);
++ vis.visit_body(mir);
++ vis.into_map(cx, maybe_storage_live_result)
+ }
+
- /// Returns true if the set of borrowers of `borrowed` living at `at` includes no more than
- /// `borrowers`.
- /// Notes:
- /// 1. It would be nice if `PossibleBorrowerMap` could store `cx` so that `at_most_borrowers`
- /// would not require it to be passed in. But a `PossibleBorrowerMap` is stored in `LintPass`
- /// `Dereferencing`, which outlives any `LateContext`.
- /// 2. In all current uses of `at_most_borrowers`, `borrowers` is a slice of at most two
- /// elements. Thus, `borrowers.contains(...)` is effectively a constant-time operation. If
- /// `at_most_borrowers`'s uses were to expand beyond this, its implementation might have to be
- /// adjusted.
- pub fn at_most_borrowers(
++ /// Returns true if the set of borrowers of `borrowed` living at `at` matches with `borrowers`.
++ pub fn only_borrowers(&mut self, borrowers: &[mir::Local], borrowed: mir::Local, at: mir::Location) -> bool {
++ self.bounded_borrowers(borrowers, borrowers, borrowed, at)
++ }
++
++ /// Returns true if the set of borrowers of `borrowed` living at `at` includes at least `below`
++ /// but no more than `above`.
++ pub fn bounded_borrowers(
+ &mut self,
- cx: &LateContext<'tcx>,
- borrowers: &[mir::Local],
++ below: &[mir::Local],
++ above: &[mir::Local],
+ borrowed: mir::Local,
+ at: mir::Location,
+ ) -> bool {
- if is_copy(cx, self.body.local_decls[borrowed].ty) {
- return true;
- }
-
- self.possible_borrower.seek_before_primary_effect(at);
- self.maybe_live.seek_before_primary_effect(at);
-
- let possible_borrower = &self.possible_borrower.get().map;
- let maybe_live = &self.maybe_live;
-
- self.pushed.clear();
- self.stack.clear();
++ self.maybe_live.seek_after_primary_effect(at);
+
- if let Some(borrowers) = possible_borrower.get(&borrowed) {
- for b in borrowers.iter() {
- if self.pushed.insert(b) {
- self.stack.push(b);
- }
++ self.bitset.0.clear();
++ let maybe_live = &mut self.maybe_live;
++ if let Some(bitset) = self.map.get(&borrowed) {
++ for b in bitset.iter().filter(move |b| maybe_live.contains(*b)) {
++ self.bitset.0.insert(b);
+ }
+ } else {
- // Nothing borrows `borrowed` at `at`.
- return true;
++ return false;
+ }
+
- while let Some(borrower) = self.stack.pop() {
- if maybe_live.contains(borrower) && !borrowers.contains(&borrower) {
- return false;
- }
++ self.bitset.1.clear();
++ for b in below {
++ self.bitset.1.insert(*b);
++ }
+
- if let Some(borrowers) = possible_borrower.get(&borrower) {
- for b in borrowers.iter() {
- if self.pushed.insert(b) {
- self.stack.push(b);
- }
- }
- }
++ if !self.bitset.0.superset(&self.bitset.1) {
++ return false;
++ }
++
++ for b in above {
++ self.bitset.0.remove(*b);
+ }
+
- true
++ self.bitset.0.is_empty()
+ }
+
+ pub fn local_is_alive_at(&mut self, local: mir::Local, at: mir::Location) -> bool {
+ self.maybe_live.seek_after_primary_effect(at);
+ self.maybe_live.contains(local)
+ }
+}
--- /dev/null
- 1,62,0 { BOOL_THEN_SOME }
+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 }
- 1,55,0 { SEEK_REWIND }
++ 1,62,0 { BOOL_THEN_SOME, DEFAULT_ENUM_ATTRIBUTE }
+ 1,58,0 { FORMAT_ARGS_CAPTURE, PATTERN_TRAIT_CHAR_ARRAY }
++ 1,55,0 { SEEK_REWIND }
+ 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 }
+}
+
+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 ITER_COUNT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "count"];
+//! 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_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
+use crate::ty::needs_ordered_drop;
+use crate::{get_enclosing_block, path_to_local_id};
+use core::ops::ControlFlow;
+use rustc_hir as hir;
+use rustc_hir::def::{CtorKind, DefKind, Res};
+use rustc_hir::intravisit::{self, walk_block, walk_expr, Visitor};
+use rustc_hir::{
+ AnonConst, Arm, Block, BlockCheckMode, Body, BodyId, Expr, ExprKind, HirId, ItemId, ItemKind, Let, Pat, QPath,
+ Stmt, UnOp, UnsafeSource, Unsafety,
+};
+use rustc_lint::LateContext;
+use rustc_middle::hir::nested_filter;
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_middle::ty::{self, Ty, TyCtxt, TypeckResults};
+use rustc_span::Span;
+
+mod internal {
+ /// Trait for visitor functions to control whether or not to descend to child nodes. Implemented
+ /// for only two types. `()` always descends. `Descend` allows controlled descent.
+ pub trait Continue {
+ fn descend(&self) -> bool;
+ }
+}
+use internal::Continue;
+
+impl Continue for () {
+ fn descend(&self) -> bool {
+ true
+ }
+}
+
+/// Allows for controlled descent when using visitor functions. Use `()` instead when always
+/// descending into child nodes.
+#[derive(Clone, Copy)]
+pub enum Descend {
+ Yes,
+ No,
+}
+impl From<bool> for Descend {
+ fn from(from: bool) -> Self {
+ if from { Self::Yes } else { Self::No }
+ }
+}
+impl Continue for Descend {
+ fn descend(&self) -> bool {
+ matches!(self, Self::Yes)
+ }
+}
+
+/// A type which can be visited.
+pub trait Visitable<'tcx> {
+ /// Calls the corresponding `visit_*` function on the visitor.
+ fn visit<V: Visitor<'tcx>>(self, visitor: &mut V);
+}
+macro_rules! visitable_ref {
+ ($t:ident, $f:ident) => {
+ impl<'tcx> Visitable<'tcx> for &'tcx $t<'tcx> {
+ fn visit<V: Visitor<'tcx>>(self, visitor: &mut V) {
+ visitor.$f(self);
+ }
+ }
+ };
+}
+visitable_ref!(Arm, visit_arm);
+visitable_ref!(Block, visit_block);
+visitable_ref!(Body, visit_body);
+visitable_ref!(Expr, visit_expr);
+visitable_ref!(Stmt, visit_stmt);
+
+/// Calls the given function once for each expression contained. This does not enter any bodies or
+/// nested items.
+pub fn for_each_expr<'tcx, B, C: Continue>(
+ node: impl Visitable<'tcx>,
+ f: impl FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B, C>,
+) -> Option<B> {
+ struct V<B, F> {
+ f: F,
+ res: Option<B>,
+ }
+ impl<'tcx, B, C: Continue, F: FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B, C>> Visitor<'tcx> for V<B, F> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'tcx>) {
+ if self.res.is_some() {
+ return;
+ }
+ match (self.f)(e) {
+ ControlFlow::Continue(c) if c.descend() => walk_expr(self, e),
+ ControlFlow::Break(b) => self.res = Some(b),
+ ControlFlow::Continue(_) => (),
+ }
+ }
+
+ // Avoid unnecessary `walk_*` calls.
+ fn visit_ty(&mut self, _: &'tcx hir::Ty<'tcx>) {}
+ fn visit_pat(&mut self, _: &'tcx Pat<'tcx>) {}
+ fn visit_qpath(&mut self, _: &'tcx QPath<'tcx>, _: HirId, _: Span) {}
+ // Avoid monomorphising all `visit_*` functions.
+ fn visit_nested_item(&mut self, _: ItemId) {}
+ }
+ let mut v = V { f, res: None };
+ node.visit(&mut v);
+ v.res
+}
+
+/// Calls the given function once for each expression contained. This will enter bodies, but not
+/// nested items.
+pub fn for_each_expr_with_closures<'tcx, B, C: Continue>(
+ cx: &LateContext<'tcx>,
+ node: impl Visitable<'tcx>,
+ f: impl FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B, C>,
+) -> Option<B> {
+ struct V<'tcx, B, F> {
+ tcx: TyCtxt<'tcx>,
+ f: F,
+ res: Option<B>,
+ }
+ impl<'tcx, B, C: Continue, F: FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B, C>> Visitor<'tcx> for V<'tcx, B, F> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'tcx>) {
+ if self.res.is_some() {
+ return;
+ }
+ match (self.f)(e) {
+ ControlFlow::Continue(c) if c.descend() => walk_expr(self, e),
+ ControlFlow::Break(b) => self.res = Some(b),
+ ControlFlow::Continue(_) => (),
+ }
+ }
+
+ // Only walk closures
+ fn visit_anon_const(&mut self, _: &'tcx AnonConst) {}
+ // Avoid unnecessary `walk_*` calls.
+ fn visit_ty(&mut self, _: &'tcx hir::Ty<'tcx>) {}
+ fn visit_pat(&mut self, _: &'tcx Pat<'tcx>) {}
+ fn visit_qpath(&mut self, _: &'tcx QPath<'tcx>, _: HirId, _: Span) {}
+ // Avoid monomorphising all `visit_*` functions.
+ fn visit_nested_item(&mut self, _: ItemId) {}
+ }
+ let mut v = V {
+ tcx: cx.tcx,
+ f,
+ res: None,
+ };
+ node.visit(&mut v);
+ v.res
+}
+
+/// returns `true` if expr contains match expr desugared from try
+fn contains_try(expr: &hir::Expr<'_>) -> bool {
+ for_each_expr(expr, |e| {
+ if matches!(e.kind, hir::ExprKind::Match(_, _, hir::MatchSource::TryDesugar)) {
+ ControlFlow::Break(())
+ } else {
+ ControlFlow::Continue(())
+ }
+ })
+ .is_some()
+}
+
+pub fn find_all_ret_expressions<'hir, F>(_cx: &LateContext<'_>, expr: &'hir hir::Expr<'hir>, callback: F) -> bool
+where
+ F: FnMut(&'hir hir::Expr<'hir>) -> bool,
+{
+ struct RetFinder<F> {
+ in_stmt: bool,
+ failed: bool,
+ cb: F,
+ }
+
+ struct WithStmtGuard<'a, F> {
+ val: &'a mut RetFinder<F>,
+ prev_in_stmt: bool,
+ }
+
+ impl<F> RetFinder<F> {
+ fn inside_stmt(&mut self, in_stmt: bool) -> WithStmtGuard<'_, F> {
+ let prev_in_stmt = std::mem::replace(&mut self.in_stmt, in_stmt);
+ WithStmtGuard {
+ val: self,
+ prev_in_stmt,
+ }
+ }
+ }
+
+ impl<F> std::ops::Deref for WithStmtGuard<'_, F> {
+ type Target = RetFinder<F>;
+
+ fn deref(&self) -> &Self::Target {
+ self.val
+ }
+ }
+
+ impl<F> std::ops::DerefMut for WithStmtGuard<'_, F> {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ self.val
+ }
+ }
+
+ impl<F> Drop for WithStmtGuard<'_, F> {
+ fn drop(&mut self) {
+ self.val.in_stmt = self.prev_in_stmt;
+ }
+ }
+
+ impl<'hir, F: FnMut(&'hir hir::Expr<'hir>) -> bool> intravisit::Visitor<'hir> for RetFinder<F> {
+ fn visit_stmt(&mut self, stmt: &'hir hir::Stmt<'_>) {
+ intravisit::walk_stmt(&mut *self.inside_stmt(true), stmt);
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'_>) {
+ if self.failed {
+ return;
+ }
+ if self.in_stmt {
+ match expr.kind {
+ hir::ExprKind::Ret(Some(expr)) => self.inside_stmt(false).visit_expr(expr),
+ _ => intravisit::walk_expr(self, expr),
+ }
+ } else {
+ match expr.kind {
+ hir::ExprKind::If(cond, then, else_opt) => {
+ self.inside_stmt(true).visit_expr(cond);
+ self.visit_expr(then);
+ if let Some(el) = else_opt {
+ self.visit_expr(el);
+ }
+ },
+ hir::ExprKind::Match(cond, arms, _) => {
+ self.inside_stmt(true).visit_expr(cond);
+ for arm in arms {
+ self.visit_expr(arm.body);
+ }
+ },
+ hir::ExprKind::Block(..) => intravisit::walk_expr(self, expr),
+ hir::ExprKind::Ret(Some(expr)) => self.visit_expr(expr),
+ _ => self.failed |= !(self.cb)(expr),
+ }
+ }
+ }
+ }
+
+ !contains_try(expr) && {
+ let mut ret_finder = RetFinder {
+ in_stmt: false,
+ failed: false,
+ cb: callback,
+ };
+ ret_finder.visit_expr(expr);
+ !ret_finder.failed
+ }
+}
+
+/// Checks if the given resolved path is used in the given body.
+pub fn is_res_used(cx: &LateContext<'_>, res: Res, body: BodyId) -> bool {
+ for_each_expr_with_closures(cx, cx.tcx.hir().body(body).value, |e| {
+ if let ExprKind::Path(p) = &e.kind {
+ if cx.qpath_res(p, e.hir_id) == res {
+ return ControlFlow::Break(());
+ }
+ }
+ ControlFlow::Continue(())
+ })
+ .is_some()
+}
+
+/// Checks if the given local is used.
+pub fn is_local_used<'tcx>(cx: &LateContext<'tcx>, visitable: impl Visitable<'tcx>, id: HirId) -> bool {
+ for_each_expr_with_closures(cx, visitable, |e| {
+ if path_to_local_id(e, id) {
+ ControlFlow::Break(())
+ } else {
+ ControlFlow::Continue(())
+ }
+ })
+ .is_some()
+}
+
+/// Checks if the given expression is a constant.
+pub fn is_const_evaluatable<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
+ struct V<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ is_const: bool,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !self.is_const {
+ return;
+ }
+ match e.kind {
+ ExprKind::ConstBlock(_) => return,
+ ExprKind::Call(
+ &Expr {
+ kind: ExprKind::Path(ref p),
+ hir_id,
+ ..
+ },
+ _,
+ ) if self
+ .cx
+ .qpath_res(p, hir_id)
+ .opt_def_id()
+ .map_or(false, |id| self.cx.tcx.is_const_fn_raw(id)) => {},
+ ExprKind::MethodCall(..)
+ if self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(e.hir_id)
+ .map_or(false, |id| self.cx.tcx.is_const_fn_raw(id)) => {},
+ ExprKind::Binary(_, lhs, rhs)
+ if self.cx.typeck_results().expr_ty(lhs).peel_refs().is_primitive_ty()
+ && self.cx.typeck_results().expr_ty(rhs).peel_refs().is_primitive_ty() => {},
+ ExprKind::Unary(UnOp::Deref, e) if self.cx.typeck_results().expr_ty(e).is_ref() => (),
+ ExprKind::Unary(_, e) if self.cx.typeck_results().expr_ty(e).peel_refs().is_primitive_ty() => (),
+ ExprKind::Index(base, _)
+ if matches!(
+ self.cx.typeck_results().expr_ty(base).peel_refs().kind(),
+ ty::Slice(_) | ty::Array(..)
+ ) => {},
+ ExprKind::Path(ref p)
+ if matches!(
+ self.cx.qpath_res(p, e.hir_id),
+ Res::Def(
+ DefKind::Const
+ | DefKind::AssocConst
+ | DefKind::AnonConst
+ | DefKind::ConstParam
+ | DefKind::Ctor(..)
+ | DefKind::Fn
+ | DefKind::AssocFn,
+ _
+ ) | Res::SelfCtor(_)
+ ) => {},
+
+ ExprKind::AddrOf(..)
+ | ExprKind::Array(_)
+ | ExprKind::Block(..)
+ | ExprKind::Cast(..)
+ | ExprKind::DropTemps(_)
+ | ExprKind::Field(..)
+ | ExprKind::If(..)
+ | ExprKind::Let(..)
+ | ExprKind::Lit(_)
+ | ExprKind::Match(..)
+ | ExprKind::Repeat(..)
+ | ExprKind::Struct(..)
+ | ExprKind::Tup(_)
+ | ExprKind::Type(..) => (),
+
+ _ => {
+ self.is_const = false;
+ return;
+ },
+ }
+ walk_expr(self, e);
+ }
+ }
+
+ let mut v = V { cx, is_const: true };
+ v.visit_expr(e);
+ v.is_const
+}
+
+/// Checks if the given expression performs an unsafe operation outside of an unsafe block.
+pub fn is_expr_unsafe<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> bool {
+ struct V<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ is_unsafe: bool,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if self.is_unsafe {
+ return;
+ }
+ match e.kind {
+ ExprKind::Unary(UnOp::Deref, e) if self.cx.typeck_results().expr_ty(e).is_unsafe_ptr() => {
+ self.is_unsafe = true;
+ },
+ ExprKind::MethodCall(..)
+ if self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(e.hir_id)
+ .map_or(false, |id| self.cx.tcx.fn_sig(id).unsafety() == Unsafety::Unsafe) =>
+ {
+ self.is_unsafe = true;
+ },
+ ExprKind::Call(func, _) => match *self.cx.typeck_results().expr_ty(func).peel_refs().kind() {
+ ty::FnDef(id, _) if self.cx.tcx.fn_sig(id).unsafety() == Unsafety::Unsafe => self.is_unsafe = true,
+ ty::FnPtr(sig) if sig.unsafety() == Unsafety::Unsafe => self.is_unsafe = true,
+ _ => walk_expr(self, e),
+ },
+ ExprKind::Path(ref p)
+ if self
+ .cx
+ .qpath_res(p, e.hir_id)
+ .opt_def_id()
+ .map_or(false, |id| self.cx.tcx.is_mutable_static(id)) =>
+ {
+ self.is_unsafe = true;
+ },
+ _ => walk_expr(self, e),
+ }
+ }
+ fn visit_block(&mut self, b: &'tcx Block<'_>) {
+ if !matches!(b.rules, BlockCheckMode::UnsafeBlock(_)) {
+ walk_block(self, b);
+ }
+ }
+ fn visit_nested_item(&mut self, id: ItemId) {
+ if let ItemKind::Impl(i) = &self.cx.tcx.hir().item(id).kind {
+ self.is_unsafe = i.unsafety == Unsafety::Unsafe;
+ }
+ }
+ }
+ let mut v = V { cx, is_unsafe: false };
+ v.visit_expr(e);
+ v.is_unsafe
+}
+
+/// Checks if the given expression contains an unsafe block
+pub fn contains_unsafe_block<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'tcx>) -> bool {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ found_unsafe: bool,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_block(&mut self, b: &'tcx Block<'_>) {
+ if self.found_unsafe {
+ return;
+ }
+ if b.rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided) {
+ self.found_unsafe = true;
+ return;
+ }
+ walk_block(self, b);
+ }
+ }
+ let mut v = V {
+ cx,
+ found_unsafe: false,
+ };
+ v.visit_expr(e);
+ v.found_unsafe
+}
+
+/// Runs the given function for each sub-expression producing the final value consumed by the parent
+/// of the give expression.
+///
+/// e.g. for the following expression
+/// ```rust,ignore
+/// if foo {
+/// f(0)
+/// } else {
+/// 1 + 1
+/// }
+/// ```
+/// this will pass both `f(0)` and `1+1` to the given function.
+pub fn for_each_value_source<'tcx, B>(
+ e: &'tcx Expr<'tcx>,
+ f: &mut impl FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ match e.kind {
+ ExprKind::Block(Block { expr: Some(e), .. }, _) => for_each_value_source(e, f),
+ ExprKind::Match(_, arms, _) => {
+ for arm in arms {
+ for_each_value_source(arm.body, f)?;
+ }
+ ControlFlow::Continue(())
+ },
+ ExprKind::If(_, if_expr, Some(else_expr)) => {
+ for_each_value_source(if_expr, f)?;
+ for_each_value_source(else_expr, f)
+ },
+ ExprKind::DropTemps(e) => for_each_value_source(e, f),
+ _ => f(e),
+ }
+}
+
+/// Runs the given function for each path expression referencing the given local which occur after
+/// the given expression.
+pub fn for_each_local_use_after_expr<'tcx, B>(
+ cx: &LateContext<'tcx>,
+ local_id: HirId,
+ expr_id: HirId,
+ f: impl FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ struct V<'cx, 'tcx, F, B> {
+ cx: &'cx LateContext<'tcx>,
+ local_id: HirId,
+ expr_id: HirId,
+ found: bool,
+ res: ControlFlow<B>,
+ f: F,
+ }
+ impl<'cx, 'tcx, F: FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B>, B> Visitor<'tcx> for V<'cx, 'tcx, F, B> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'tcx>) {
+ if !self.found {
+ if e.hir_id == self.expr_id {
+ self.found = true;
+ } else {
+ walk_expr(self, e);
+ }
+ return;
+ }
+ if self.res.is_break() {
+ return;
+ }
+ if path_to_local_id(e, self.local_id) {
+ self.res = (self.f)(e);
+ } else {
+ walk_expr(self, e);
+ }
+ }
+ }
+
+ if let Some(b) = get_enclosing_block(cx, local_id) {
+ let mut v = V {
+ cx,
+ local_id,
+ expr_id,
+ found: false,
+ res: ControlFlow::Continue(()),
+ f,
+ };
+ v.visit_block(b);
+ v.res
+ } else {
+ ControlFlow::Continue(())
+ }
+}
+
+// Calls the given function for every unconsumed temporary created by the expression. Note the
+// function is only guaranteed to be called for types which need to be dropped, but it may be called
+// for other types.
+#[allow(clippy::too_many_lines)]
+pub fn for_each_unconsumed_temporary<'tcx, B>(
+ cx: &LateContext<'tcx>,
+ e: &'tcx Expr<'tcx>,
+ mut f: impl FnMut(Ty<'tcx>) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ // Todo: Handle partially consumed values.
+ fn helper<'tcx, B>(
+ typeck: &'tcx TypeckResults<'tcx>,
+ consume: bool,
+ e: &'tcx Expr<'tcx>,
+ f: &mut impl FnMut(Ty<'tcx>) -> ControlFlow<B>,
+ ) -> ControlFlow<B> {
+ if !consume
+ || matches!(
+ typeck.expr_adjustments(e),
+ [adjust, ..] if matches!(adjust.kind, Adjust::Borrow(_) | Adjust::Deref(_))
+ )
+ {
+ match e.kind {
+ ExprKind::Path(QPath::Resolved(None, p))
+ if matches!(p.res, Res::Def(DefKind::Ctor(_, CtorKind::Const), _)) =>
+ {
+ f(typeck.expr_ty(e))?;
+ },
+ ExprKind::Path(_)
+ | ExprKind::Unary(UnOp::Deref, _)
+ | ExprKind::Index(..)
+ | ExprKind::Field(..)
+ | ExprKind::AddrOf(..) => (),
+ _ => f(typeck.expr_ty(e))?,
+ }
+ }
+ match e.kind {
+ ExprKind::AddrOf(_, _, e)
+ | ExprKind::Field(e, _)
+ | ExprKind::Unary(UnOp::Deref, e)
+ | ExprKind::Match(e, ..)
+ | ExprKind::Let(&Let { init: e, .. }) => {
+ helper(typeck, false, e, f)?;
+ },
+ ExprKind::Block(&Block { expr: Some(e), .. }, _)
+ | ExprKind::Box(e)
+ | ExprKind::Cast(e, _)
+ | ExprKind::Unary(_, e) => {
+ helper(typeck, true, e, f)?;
+ },
+ ExprKind::Call(callee, args) => {
+ helper(typeck, true, callee, f)?;
+ for arg in args {
+ helper(typeck, true, arg, f)?;
+ }
+ },
+ ExprKind::MethodCall(_, receiver, args, _) => {
+ helper(typeck, true, receiver, f)?;
+ for arg in args {
+ helper(typeck, true, arg, f)?;
+ }
+ },
+ ExprKind::Tup(args) | ExprKind::Array(args) => {
+ for arg in args {
+ helper(typeck, true, arg, f)?;
+ }
+ },
+ ExprKind::Index(borrowed, consumed)
+ | ExprKind::Assign(borrowed, consumed, _)
+ | ExprKind::AssignOp(_, borrowed, consumed) => {
+ helper(typeck, false, borrowed, f)?;
+ helper(typeck, true, consumed, f)?;
+ },
+ ExprKind::Binary(_, lhs, rhs) => {
+ helper(typeck, true, lhs, f)?;
+ helper(typeck, true, rhs, f)?;
+ },
+ ExprKind::Struct(_, fields, default) => {
+ for field in fields {
+ helper(typeck, true, field.expr, f)?;
+ }
+ if let Some(default) = default {
+ helper(typeck, false, default, f)?;
+ }
+ },
+ ExprKind::If(cond, then, else_expr) => {
+ helper(typeck, true, cond, f)?;
+ helper(typeck, true, then, f)?;
+ if let Some(else_expr) = else_expr {
+ helper(typeck, true, else_expr, f)?;
+ }
+ },
+ ExprKind::Type(e, _) => {
+ helper(typeck, consume, e, f)?;
+ },
+
+ // Either drops temporaries, jumps out of the current expression, or has no sub expression.
+ ExprKind::DropTemps(_)
+ | ExprKind::Ret(_)
+ | ExprKind::Break(..)
+ | ExprKind::Yield(..)
+ | ExprKind::Block(..)
+ | ExprKind::Loop(..)
+ | ExprKind::Repeat(..)
+ | ExprKind::Lit(_)
+ | ExprKind::ConstBlock(_)
+ | ExprKind::Closure { .. }
+ | ExprKind::Path(_)
+ | ExprKind::Continue(_)
+ | ExprKind::InlineAsm(_)
+ | ExprKind::Err => (),
+ }
+ ControlFlow::Continue(())
+ }
+ helper(cx.typeck_results(), true, e, &mut f)
+}
+
+pub fn any_temporaries_need_ordered_drop<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'tcx>) -> bool {
+ for_each_unconsumed_temporary(cx, e, |ty| {
+ if needs_ordered_drop(cx, ty) {
+ ControlFlow::Break(())
+ } else {
+ ControlFlow::Continue(())
+ }
+ })
+ .is_break()
+}
+
+/// Runs the given function for each path expression referencing the given local which occur after
+/// the given expression.
+pub fn for_each_local_assignment<'tcx, B>(
+ cx: &LateContext<'tcx>,
+ local_id: HirId,
+ f: impl FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ struct V<'cx, 'tcx, F, B> {
+ cx: &'cx LateContext<'tcx>,
+ local_id: HirId,
+ res: ControlFlow<B>,
+ f: F,
+ }
+ impl<'cx, 'tcx, F: FnMut(&'tcx Expr<'tcx>) -> ControlFlow<B>, B> Visitor<'tcx> for V<'cx, 'tcx, F, B> {
+ type NestedFilter = nested_filter::OnlyBodies;
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'tcx>) {
+ if let ExprKind::Assign(lhs, rhs, _) = e.kind
+ && self.res.is_continue()
+ && path_to_local_id(lhs, self.local_id)
+ {
+ self.res = (self.f)(rhs);
+ self.visit_expr(rhs);
+ } else {
+ walk_expr(self, e);
+ }
+ }
+ }
+
+ if let Some(b) = get_enclosing_block(cx, local_id) {
+ let mut v = V {
+ cx,
+ local_id,
+ res: ControlFlow::Continue(()),
+ f,
+ };
+ v.visit_block(b);
+ v.res
+ } else {
+ ControlFlow::Continue(())
+ }
+}
++
++pub fn contains_break_or_continue(expr: &Expr<'_>) -> bool {
++ for_each_expr(expr, |e| {
++ if matches!(e.kind, ExprKind::Break(..) | ExprKind::Continue(..)) {
++ ControlFlow::Break(())
++ } else {
++ ControlFlow::Continue(())
++ }
++ })
++ .is_some()
++}
--- /dev/null
- channel = "nightly-2022-12-29"
+[toolchain]
++channel = "nightly-2023-01-12"
+components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
- args.extend(vec!["--sysroot".into(), sys_root]);
+#![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 has_sysroot_arg = arg_value(&orig_args, "--sysroot", |_| true).is_some();
+
+ 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 {
++ if !has_sysroot_arg {
++ 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
++//! This test is meant to only be run in CI. To run it locally use:
++//!
++//! `env INTEGRATION=rust-lang/log cargo test --test integration --features=integration`
++//!
++//! You can use a different `INTEGRATION` value to test different repositories.
++//!
++//! This test will clone the specified repository and run Clippy on it. The test succeeds, if
++//! Clippy doesn't produce an ICE. Lint warnings are ignored by this test.
++
+#![cfg(feature = "integration")]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use std::env;
+use std::ffi::OsStr;
+use std::process::Command;
+
+#[cfg(not(windows))]
+const CARGO_CLIPPY: &str = "cargo-clippy";
+#[cfg(windows)]
+const CARGO_CLIPPY: &str = "cargo-clippy.exe";
+
+#[cfg_attr(feature = "integration", test)]
+fn integration_test() {
+ let repo_name = env::var("INTEGRATION").expect("`INTEGRATION` var not set");
+ let repo_url = format!("https://github.com/{repo_name}");
+ let crate_name = repo_name
+ .split('/')
+ .nth(1)
+ .expect("repo name should have format `<org>/<name>`");
+
+ let mut repo_dir = tempfile::tempdir().expect("couldn't create temp dir").into_path();
+ repo_dir.push(crate_name);
+
+ let st = Command::new("git")
+ .args([
+ OsStr::new("clone"),
+ OsStr::new("--depth=1"),
+ OsStr::new(&repo_url),
+ OsStr::new(&repo_dir),
+ ])
+ .status()
+ .expect("unable to run git");
+ assert!(st.success());
+
+ let root_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+ let target_dir = std::path::Path::new(&root_dir).join("target");
+ let clippy_binary = target_dir.join(env!("PROFILE")).join(CARGO_CLIPPY);
+
+ let output = Command::new(clippy_binary)
+ .current_dir(repo_dir)
+ .env("RUST_BACKTRACE", "full")
+ .env("CARGO_TARGET_DIR", target_dir)
+ .args([
+ "clippy",
+ "--all-targets",
+ "--all-features",
+ "--",
+ "--cap-lints",
+ "warn",
+ "-Wclippy::pedantic",
+ "-Wclippy::nursery",
+ ])
+ .output()
+ .expect("unable to run clippy");
+
+ let stderr = String::from_utf8_lossy(&output.stderr);
+ if let Some(backtrace_start) = stderr.find("error: internal compiler error") {
+ static BACKTRACE_END_MSG: &str = "end of query stack";
+ let backtrace_end = stderr[backtrace_start..]
+ .find(BACKTRACE_END_MSG)
+ .expect("end of backtrace not found");
+
+ panic!(
+ "internal compiler error\nBacktrace:\n\n{}",
+ &stderr[backtrace_start..backtrace_start + backtrace_end + BACKTRACE_END_MSG.len()]
+ );
+ } else if stderr.contains("query stack during panic") {
+ panic!("query stack during panic in the output");
+ } else if stderr.contains("E0463") {
+ // Encountering E0463 (can't find crate for `x`) did _not_ cause the build to fail in the
+ // past. Even though it should have. That's why we explicitly panic here.
+ // See PR #3552 and issue #3523 for more background.
+ panic!("error: E0463");
+ } else if stderr.contains("E0514") {
+ panic!("incompatible crate versions");
+ } else if stderr.contains("failed to run `rustc` to learn about target-specific information") {
+ panic!("couldn't find librustc_driver, consider setting `LD_LIBRARY_PATH`");
+ } else {
+ assert!(
+ !stderr.contains("toolchain") || !stderr.contains("is not installed"),
+ "missing required toolchain"
+ );
+ }
+
+ match output.status.code() {
+ Some(0) => println!("Compilation successful"),
+ Some(code) => eprintln!("Compilation failed. Exit code: {code}"),
+ None => panic!("Process terminated by signal"),
+ }
+}
--- /dev/null
- // is specifically on the list
+#![warn(clippy::arithmetic_side_effects)]
+
+use core::ops::{Add, Neg};
+
+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!()
+ }
+ }
+ };
+}
+
+create!(Foo);
+create!(Bar);
+create!(Baz);
+create!(OutOfNames);
+
+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 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;
+
+ // not on the list
+ let _ = 1i64 + Foo;
+ // is implicitly on the list
+ let _ = 1i64 + Bar;
+ // not on the list
+ let _ = 1i64 + Baz;
+}
+
+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 explicitly on the list
+ let _ = -Foo;
+ // not on the list
+ let _ = -Bar;
+ // not on the list
+ let _ = -Baz;
+}
+
+fn main() {}
--- /dev/null
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:5:22
+ |
+LL | if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::dbg-macro` implied by `-D warnings`
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | if let Some(n) = n.checked_sub(4) { n } else { n }
+ | ~~~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:9:8
+ |
+LL | if dbg!(n <= 1) {
+ | ^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | if n <= 1 {
+ | ~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:10:9
+ |
+LL | dbg!(1)
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 1
+ |
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:12:9
+ |
+LL | dbg!(n * factorial(n - 1))
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | n * factorial(n - 1)
+ |
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:17:5
+ |
+LL | dbg!(42);
+ | ^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 42;
+ | ~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:18:5
+ |
+LL | dbg!(dbg!(dbg!(42)));
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | dbg!(dbg!(42));
+ | ~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:19:14
+ |
+LL | foo(3) + dbg!(factorial(4));
+ | ^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | foo(3) + factorial(4);
+ | ~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:20:5
+ |
+LL | dbg!(1, 2, dbg!(3, 4));
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | (1, 2, dbg!(3, 4));
+ | ~~~~~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:21:5
+ |
+LL | dbg!(1, 2, 3, 4, 5);
+ | ^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | (1, 2, 3, 4, 5);
+ | ~~~~~~~~~~~~~~~
+
+error: aborting due to 9 previous errors
+
--- /dev/null
- ( $( $_trait:ident, $ty:ty, $method:ident; )* ) => {
+#![allow(
+ clippy::assign_op_pattern,
+ clippy::erasing_op,
+ clippy::identity_op,
++ clippy::no_effect,
+ clippy::op_ref,
+ clippy::unnecessary_owned_empty_strings,
+ arithmetic_overflow,
+ unconditional_panic
+)]
+#![feature(const_mut_refs, inline_const, saturating_int_impl)]
+#![warn(clippy::arithmetic_side_effects)]
+
+use core::num::{Saturating, Wrapping};
+
++#[derive(Clone, Copy)]
+pub struct Custom;
+
+macro_rules! impl_arith {
- impl core::ops::$_trait<$ty> for Custom {
- type Output = Self;
- fn $method(self, _: $ty) -> Self::Output { Self }
++ ( $( $_trait:ident, $lhs:ty, $rhs:ty, $method:ident; )* ) => {
+ $(
- Add, i32, add;
- Div, i32, div;
- Mul, i32, mul;
- Sub, i32, sub;
-
- Add, f64, add;
- Div, f64, div;
- Mul, f64, mul;
- Sub, f64, sub;
++ impl core::ops::$_trait<$lhs> for $rhs {
++ type Output = Custom;
++ fn $method(self, _: $lhs) -> Self::Output { todo!() }
++ }
++ )*
++ }
++}
++
++macro_rules! impl_assign_arith {
++ ( $( $_trait:ident, $lhs:ty, $rhs:ty, $method:ident; )* ) => {
++ $(
++ impl core::ops::$_trait<$lhs> for $rhs {
++ fn $method(&mut self, _: $lhs) {}
+ }
+ )*
+ }
+}
+
+impl_arith!(
- pub fn runtime_ops() {
++ Add, Custom, Custom, add;
++ Div, Custom, Custom, div;
++ Mul, Custom, Custom, mul;
++ Rem, Custom, Custom, rem;
++ Sub, Custom, Custom, sub;
++
++ Add, Custom, &Custom, add;
++ Div, Custom, &Custom, div;
++ Mul, Custom, &Custom, mul;
++ Rem, Custom, &Custom, rem;
++ Sub, Custom, &Custom, sub;
++
++ Add, &Custom, Custom, add;
++ Div, &Custom, Custom, div;
++ Mul, &Custom, Custom, mul;
++ Rem, &Custom, Custom, rem;
++ Sub, &Custom, Custom, sub;
++
++ Add, &Custom, &Custom, add;
++ Div, &Custom, &Custom, div;
++ Mul, &Custom, &Custom, mul;
++ Rem, &Custom, &Custom, rem;
++ Sub, &Custom, &Custom, sub;
++);
++
++impl_assign_arith!(
++ AddAssign, Custom, Custom, add_assign;
++ DivAssign, Custom, Custom, div_assign;
++ MulAssign, Custom, Custom, mul_assign;
++ RemAssign, Custom, Custom, rem_assign;
++ SubAssign, Custom, Custom, sub_assign;
++
++ AddAssign, Custom, &Custom, add_assign;
++ DivAssign, Custom, &Custom, div_assign;
++ MulAssign, Custom, &Custom, mul_assign;
++ RemAssign, Custom, &Custom, rem_assign;
++ SubAssign, Custom, &Custom, sub_assign;
++
++ AddAssign, &Custom, Custom, add_assign;
++ DivAssign, &Custom, Custom, div_assign;
++ MulAssign, &Custom, Custom, mul_assign;
++ RemAssign, &Custom, Custom, rem_assign;
++ SubAssign, &Custom, Custom, sub_assign;
++
++ AddAssign, &Custom, &Custom, add_assign;
++ DivAssign, &Custom, &Custom, div_assign;
++ MulAssign, &Custom, &Custom, mul_assign;
++ RemAssign, &Custom, &Custom, rem_assign;
++ SubAssign, &Custom, &Custom, sub_assign;
+);
+
++impl core::ops::Neg for Custom {
++ type Output = Custom;
++ fn neg(self) -> Self::Output {
++ todo!()
++ }
++}
++impl core::ops::Neg for &Custom {
++ type Output = Custom;
++ fn neg(self) -> Self::Output {
++ todo!()
++ }
++}
++
+pub fn association_with_structures_should_not_trigger_the_lint() {
+ enum Foo {
+ Bar = -2,
+ }
+
+ impl Trait for Foo {
+ const ASSOC: i32 = {
+ let _: [i32; 1 + 1];
+ fn foo() {}
+ 1 + 1
+ };
+ }
+
+ struct Baz([i32; 1 + 1]);
+
+ trait Trait {
+ const ASSOC: i32 = 1 + 1;
+ }
+
+ type Alias = [i32; 1 + 1];
+
+ union Qux {
+ field: [i32; 1 + 1],
+ }
+
+ let _: [i32; 1 + 1] = [0, 0];
+
+ let _: [i32; 1 + 1] = {
+ let a: [i32; 1 + 1] = [0, 0];
+ a
+ };
+}
+
+pub fn hard_coded_allowed() {
+ let _ = 1f32 + 1f32;
+ let _ = 1f64 + 1f64;
+
+ let _ = Saturating(0u32) + Saturating(0u32);
+ let _ = String::new() + "";
+ let _ = Wrapping(0u32) + Wrapping(0u32);
+
+ let saturating: Saturating<u32> = Saturating(0u32);
+ let string: String = String::new();
+ let wrapping: Wrapping<u32> = Wrapping(0u32);
+
+ let inferred_saturating = saturating + saturating;
+ let inferred_string = string + "";
+ let inferred_wrapping = wrapping + wrapping;
+
+ let _ = inferred_saturating + inferred_saturating;
+ let _ = inferred_string + "";
+ let _ = inferred_wrapping + inferred_wrapping;
+}
+
+#[rustfmt::skip]
+pub fn const_ops_should_not_trigger_the_lint() {
+ const _: i32 = { let mut n = 1; n += 1; n };
+ let _ = const { let mut n = 1; n += 1; n };
+
+ const _: i32 = { let mut n = 1; n = n + 1; n };
+ let _ = const { let mut n = 1; n = n + 1; n };
+
+ const _: i32 = { let mut n = 1; n = 1 + n; n };
+ let _ = const { let mut n = 1; n = 1 + n; n };
+
+ const _: i32 = 1 + 1;
+ let _ = const { 1 + 1 };
+
+ const _: i32 = { let mut n = 1; n = -1; n = -(-1); n = -n; n };
+ let _ = const { let mut n = 1; n = -1; n = -(-1); n = -n; n };
+}
+
+pub fn non_overflowing_ops_or_ops_already_handled_by_the_compiler_should_not_trigger_the_lint() {
+ let mut _n = i32::MAX;
+
+ // Assign
+ _n += 0;
+ _n += &0;
+ _n -= 0;
+ _n -= &0;
+ _n /= 99;
+ _n /= &99;
+ _n %= 99;
+ _n %= &99;
+ _n *= 0;
+ _n *= &0;
+ _n *= 1;
+ _n *= &1;
++ _n += -0;
++ _n += &-0;
++ _n -= -0;
++ _n -= &-0;
++ _n /= -99;
++ _n /= &-99;
++ _n %= -99;
++ _n %= &-99;
++ _n *= -0;
++ _n *= &-0;
++ _n *= -1;
++ _n *= &-1;
+
+ // Binary
+ _n = _n + 0;
+ _n = _n + &0;
+ _n = 0 + _n;
+ _n = &0 + _n;
+ _n = _n - 0;
+ _n = _n - &0;
+ _n = 0 - _n;
+ _n = &0 - _n;
+ _n = _n / 99;
+ _n = _n / &99;
+ _n = _n % 99;
+ _n = _n % &99;
+ _n = _n * 0;
+ _n = _n * &0;
+ _n = 0 * _n;
+ _n = &0 * _n;
+ _n = _n * 1;
+ _n = _n * &1;
+ _n = 1 * _n;
+ _n = &1 * _n;
+ _n = 23 + 85;
+
+ // Unary
+ _n = -2147483647;
+ _n = -i32::MAX;
+ _n = -i32::MIN;
+ _n = -&2147483647;
+ _n = -&i32::MAX;
+ _n = -&i32::MIN;
+}
+
-
- // Custom
- let _ = Custom + 0;
- let _ = Custom + 1;
- let _ = Custom + 2;
- let _ = Custom + 0.0;
- let _ = Custom + 1.0;
- let _ = Custom + 2.0;
- let _ = Custom - 0;
- let _ = Custom - 1;
- let _ = Custom - 2;
- let _ = Custom - 0.0;
- let _ = Custom - 1.0;
- let _ = Custom - 2.0;
- let _ = Custom / 0;
- let _ = Custom / 1;
- let _ = Custom / 2;
- let _ = Custom / 0.0;
- let _ = Custom / 1.0;
- let _ = Custom / 2.0;
- let _ = Custom * 0;
- let _ = Custom * 1;
- let _ = Custom * 2;
- let _ = Custom * 0.0;
- let _ = Custom * 1.0;
- let _ = Custom * 2.0;
++pub fn unknown_ops_or_runtime_ops_that_can_overflow() {
+ let mut _n = i32::MAX;
++ let mut _custom = Custom;
+
+ // Assign
+ _n += 1;
+ _n += &1;
+ _n -= 1;
+ _n -= &1;
+ _n /= 0;
+ _n /= &0;
+ _n %= 0;
+ _n %= &0;
+ _n *= 2;
+ _n *= &2;
++ _n += -1;
++ _n += &-1;
++ _n -= -1;
++ _n -= &-1;
++ _n /= -0;
++ _n /= &-0;
++ _n %= -0;
++ _n %= &-0;
++ _n *= -2;
++ _n *= &-2;
++ _custom += Custom;
++ _custom += &Custom;
++ _custom -= Custom;
++ _custom -= &Custom;
++ _custom /= Custom;
++ _custom /= &Custom;
++ _custom %= Custom;
++ _custom %= &Custom;
++ _custom *= Custom;
++ _custom *= &Custom;
++ _custom += -Custom;
++ _custom += &-Custom;
++ _custom -= -Custom;
++ _custom -= &-Custom;
++ _custom /= -Custom;
++ _custom /= &-Custom;
++ _custom %= -Custom;
++ _custom %= &-Custom;
++ _custom *= -Custom;
++ _custom *= &-Custom;
+
+ // Binary
+ _n = _n + 1;
+ _n = _n + &1;
+ _n = 1 + _n;
+ _n = &1 + _n;
+ _n = _n - 1;
+ _n = _n - &1;
+ _n = 1 - _n;
+ _n = &1 - _n;
+ _n = _n / 0;
+ _n = _n / &0;
+ _n = _n % 0;
+ _n = _n % &0;
+ _n = _n * 2;
+ _n = _n * &2;
+ _n = 2 * _n;
+ _n = &2 * _n;
+ _n = 23 + &85;
+ _n = &23 + 85;
+ _n = &23 + &85;
++ _custom = _custom + _custom;
++ _custom = _custom + &_custom;
++ _custom = Custom + _custom;
++ _custom = &Custom + _custom;
++ _custom = _custom - Custom;
++ _custom = _custom - &Custom;
++ _custom = Custom - _custom;
++ _custom = &Custom - _custom;
++ _custom = _custom / Custom;
++ _custom = _custom / &Custom;
++ _custom = _custom % Custom;
++ _custom = _custom % &Custom;
++ _custom = _custom * Custom;
++ _custom = _custom * &Custom;
++ _custom = Custom * _custom;
++ _custom = &Custom * _custom;
++ _custom = Custom + &Custom;
++ _custom = &Custom + Custom;
++ _custom = &Custom + &Custom;
+
+ // Unary
+ _n = -_n;
+ _n = -&_n;
++ _custom = -_custom;
++ _custom = -&_custom;
++}
++
++// Copied and pasted from the `integer_arithmetic` lint for comparison.
++pub fn integer_arithmetic() {
++ let mut i = 1i32;
++ let mut var1 = 0i32;
++ let mut var2 = -1i32;
++
++ 1 + i;
++ i * 2;
++ 1 % i / 2;
++ i - 2 + 2 - i;
++ -i;
++ i >> 1;
++ i << 1;
++
++ -1;
++ -(-1);
++
++ i & 1;
++ i | 1;
++ i ^ 1;
++
++ i += 1;
++ i -= 1;
++ i *= 2;
++ i /= 2;
++ i /= 0;
++ i /= -1;
++ i /= var1;
++ i /= var2;
++ i %= 2;
++ i %= 0;
++ i %= -1;
++ i %= var1;
++ i %= var2;
++ i <<= 3;
++ i >>= 2;
++
++ i |= 1;
++ i &= 1;
++ i ^= i;
+}
+
+fn main() {}
--- /dev/null
- --> $DIR/arithmetic_side_effects.rs:165:5
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:166:5
++ --> $DIR/arithmetic_side_effects.rs:243:5
+ |
+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:167:5
++ --> $DIR/arithmetic_side_effects.rs:244:5
+ |
+LL | _n += &1;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:168:5
++ --> $DIR/arithmetic_side_effects.rs:245:5
+ |
+LL | _n -= 1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:169:5
++ --> $DIR/arithmetic_side_effects.rs:246:5
+ |
+LL | _n -= &1;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:170:5
++ --> $DIR/arithmetic_side_effects.rs:247:5
+ |
+LL | _n /= 0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:171:5
++ --> $DIR/arithmetic_side_effects.rs:248:5
+ |
+LL | _n /= &0;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:172:5
++ --> $DIR/arithmetic_side_effects.rs:249:5
+ |
+LL | _n %= 0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:173:5
++ --> $DIR/arithmetic_side_effects.rs:250:5
+ |
+LL | _n %= &0;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:174:5
++ --> $DIR/arithmetic_side_effects.rs:251:5
+ |
+LL | _n *= 2;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:177:10
++ --> $DIR/arithmetic_side_effects.rs:252:5
+ |
+LL | _n *= &2;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:178:10
++ --> $DIR/arithmetic_side_effects.rs:253:5
++ |
++LL | _n += -1;
++ | ^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:254:5
++ |
++LL | _n += &-1;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:255:5
++ |
++LL | _n -= -1;
++ | ^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:256:5
++ |
++LL | _n -= &-1;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:257:5
++ |
++LL | _n /= -0;
++ | ^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:258:5
++ |
++LL | _n /= &-0;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:259:5
++ |
++LL | _n %= -0;
++ | ^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:260:5
++ |
++LL | _n %= &-0;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:261:5
++ |
++LL | _n *= -2;
++ | ^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:262:5
++ |
++LL | _n *= &-2;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:263:5
++ |
++LL | _custom += Custom;
++ | ^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:264:5
++ |
++LL | _custom += &Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:265:5
++ |
++LL | _custom -= Custom;
++ | ^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:266:5
++ |
++LL | _custom -= &Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:267:5
++ |
++LL | _custom /= Custom;
++ | ^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:268:5
++ |
++LL | _custom /= &Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:269:5
++ |
++LL | _custom %= Custom;
++ | ^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:270:5
++ |
++LL | _custom %= &Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:271:5
++ |
++LL | _custom *= Custom;
++ | ^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:272:5
++ |
++LL | _custom *= &Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:273:5
++ |
++LL | _custom += -Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:274:5
++ |
++LL | _custom += &-Custom;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:275:5
++ |
++LL | _custom -= -Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:276:5
++ |
++LL | _custom -= &-Custom;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:277:5
++ |
++LL | _custom /= -Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:278:5
++ |
++LL | _custom /= &-Custom;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:279:5
++ |
++LL | _custom %= -Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:280:5
++ |
++LL | _custom %= &-Custom;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:281:5
++ |
++LL | _custom *= -Custom;
++ | ^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:282:5
++ |
++LL | _custom *= &-Custom;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:285:10
+ |
+LL | _n = _n + 1;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:179:10
++ --> $DIR/arithmetic_side_effects.rs:286:10
+ |
+LL | _n = _n + &1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:180:10
++ --> $DIR/arithmetic_side_effects.rs:287:10
+ |
+LL | _n = 1 + _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:181:10
++ --> $DIR/arithmetic_side_effects.rs:288:10
+ |
+LL | _n = &1 + _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:182:10
++ --> $DIR/arithmetic_side_effects.rs:289:10
+ |
+LL | _n = _n - 1;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:183:10
++ --> $DIR/arithmetic_side_effects.rs:290:10
+ |
+LL | _n = _n - &1;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:184:10
++ --> $DIR/arithmetic_side_effects.rs:291:10
+ |
+LL | _n = 1 - _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:185:10
++ --> $DIR/arithmetic_side_effects.rs:292:10
+ |
+LL | _n = &1 - _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:186:10
++ --> $DIR/arithmetic_side_effects.rs:293:10
+ |
+LL | _n = _n / 0;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:187:10
++ --> $DIR/arithmetic_side_effects.rs:294:10
+ |
+LL | _n = _n / &0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:188:10
++ --> $DIR/arithmetic_side_effects.rs:295:10
+ |
+LL | _n = _n % 0;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:189:10
++ --> $DIR/arithmetic_side_effects.rs:296:10
+ |
+LL | _n = _n % &0;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:190:10
++ --> $DIR/arithmetic_side_effects.rs:297:10
+ |
+LL | _n = _n * 2;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:191:10
++ --> $DIR/arithmetic_side_effects.rs:298:10
+ |
+LL | _n = _n * &2;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:192:10
++ --> $DIR/arithmetic_side_effects.rs:299:10
+ |
+LL | _n = 2 * _n;
+ | ^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:193:10
++ --> $DIR/arithmetic_side_effects.rs:300:10
+ |
+LL | _n = &2 * _n;
+ | ^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:194:10
++ --> $DIR/arithmetic_side_effects.rs:301:10
+ |
+LL | _n = 23 + &85;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:195:10
++ --> $DIR/arithmetic_side_effects.rs:302:10
+ |
+LL | _n = &23 + 85;
+ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- --> $DIR/arithmetic_side_effects.rs:198:13
++ --> $DIR/arithmetic_side_effects.rs:303:10
+ |
+LL | _n = &23 + &85;
+ | ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 0;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:304:15
+ |
- --> $DIR/arithmetic_side_effects.rs:199:13
++LL | _custom = _custom + _custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 1;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:305:15
+ |
- --> $DIR/arithmetic_side_effects.rs:200:13
++LL | _custom = _custom + &_custom;
++ | ^^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 2;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:306:15
+ |
- --> $DIR/arithmetic_side_effects.rs:201:13
++LL | _custom = Custom + _custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 0.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:307:15
+ |
- --> $DIR/arithmetic_side_effects.rs:202:13
++LL | _custom = &Custom + _custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 1.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:308:15
+ |
- --> $DIR/arithmetic_side_effects.rs:203:13
++LL | _custom = _custom - Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom + 2.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:309:15
+ |
- --> $DIR/arithmetic_side_effects.rs:204:13
++LL | _custom = _custom - &Custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 0;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:310:15
+ |
- --> $DIR/arithmetic_side_effects.rs:205:13
++LL | _custom = Custom - _custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 1;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:311:15
+ |
- --> $DIR/arithmetic_side_effects.rs:206:13
++LL | _custom = &Custom - _custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 2;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:312:15
+ |
- --> $DIR/arithmetic_side_effects.rs:207:13
++LL | _custom = _custom / Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 0.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:313:15
+ |
- --> $DIR/arithmetic_side_effects.rs:208:13
++LL | _custom = _custom / &Custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 1.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:314:15
+ |
- --> $DIR/arithmetic_side_effects.rs:209:13
++LL | _custom = _custom % Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom - 2.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:315:15
+ |
- --> $DIR/arithmetic_side_effects.rs:210:13
++LL | _custom = _custom % &Custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 0;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:316:15
+ |
- --> $DIR/arithmetic_side_effects.rs:211:13
++LL | _custom = _custom * Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 1;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:317:15
+ |
- --> $DIR/arithmetic_side_effects.rs:212:13
++LL | _custom = _custom * &Custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 2;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:318:15
+ |
- --> $DIR/arithmetic_side_effects.rs:213:13
++LL | _custom = Custom * _custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 0.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:319:15
+ |
- --> $DIR/arithmetic_side_effects.rs:214:13
++LL | _custom = &Custom * _custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 1.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:320:15
+ |
- --> $DIR/arithmetic_side_effects.rs:215:13
++LL | _custom = Custom + &Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom / 2.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:321:15
+ |
- --> $DIR/arithmetic_side_effects.rs:216:13
++LL | _custom = &Custom + Custom;
++ | ^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 0;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:322:15
+ |
- --> $DIR/arithmetic_side_effects.rs:217:13
++LL | _custom = &Custom + &Custom;
++ | ^^^^^^^^^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 1;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:325:10
+ |
- --> $DIR/arithmetic_side_effects.rs:218:13
++LL | _n = -_n;
++ | ^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 2;
- | ^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:326:10
+ |
- --> $DIR/arithmetic_side_effects.rs:219:13
++LL | _n = -&_n;
++ | ^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 0.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:327:15
+ |
- --> $DIR/arithmetic_side_effects.rs:220:13
++LL | _custom = -_custom;
++ | ^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 1.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:328:15
+ |
- --> $DIR/arithmetic_side_effects.rs:221:13
++LL | _custom = -&_custom;
++ | ^^^^^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | let _ = Custom * 2.0;
- | ^^^^^^^^^^^^
++ --> $DIR/arithmetic_side_effects.rs:337:5
+ |
- --> $DIR/arithmetic_side_effects.rs:224:10
++LL | 1 + i;
++ | ^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | _n = -_n;
- | ^^^
++ --> $DIR/arithmetic_side_effects.rs:338:5
+ |
- --> $DIR/arithmetic_side_effects.rs:225:10
++LL | i * 2;
++ | ^^^^^
+
+error: arithmetic operation that can potentially result in unexpected side-effects
- LL | _n = -&_n;
- | ^^^^
++ --> $DIR/arithmetic_side_effects.rs:340:5
+ |
- error: aborting due to 55 previous errors
++LL | i - 2 + 2 - i;
++ | ^^^^^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:341:5
++ |
++LL | -i;
++ | ^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:342:5
++ |
++LL | i >> 1;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:343:5
++ |
++LL | i << 1;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:352:5
++ |
++LL | i += 1;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:353:5
++ |
++LL | i -= 1;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:354:5
++ |
++LL | i *= 2;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:356:5
++ |
++LL | i /= 0;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:358:5
++ |
++LL | i /= var1;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:359:5
++ |
++LL | i /= var2;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:361:5
++ |
++LL | i %= 0;
++ | ^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:363:5
++ |
++LL | i %= var1;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:364:5
++ |
++LL | i %= var2;
++ | ^^^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:365:5
++ |
++LL | i <<= 3;
++ | ^^^^^^^
++
++error: arithmetic operation that can potentially result in unexpected side-effects
++ --> $DIR/arithmetic_side_effects.rs:366:5
++ |
++LL | i >>= 2;
++ | ^^^^^^^
+
++error: aborting due to 99 previous errors
+
--- /dev/null
- let _vec = Box::<std::vec::Vec<u8>>::default();
+// run-rustfix
+#![warn(clippy::box_default)]
+
+#[derive(Default)]
+struct ImplementsDefault;
+
+struct OwnDefault;
+
+impl OwnDefault {
+ fn default() -> Self {
+ Self
+ }
+}
+
+macro_rules! outer {
+ ($e: expr) => {
+ $e
+ };
+}
+
+fn main() {
+ let _string: Box<String> = Box::default();
+ let _byte = Box::<u8>::default();
- let _in_macro = outer!(Box::<std::string::String>::default());
- let _string_default = outer!(Box::<std::string::String>::default());
++ let _vec = Box::<Vec<u8>>::default();
+ let _impl = Box::<ImplementsDefault>::default();
+ let _impl2 = Box::<ImplementsDefault>::default();
+ let _impl3: Box<ImplementsDefault> = Box::default();
+ let _own = Box::new(OwnDefault::default()); // should not lint
- let _vec4: Box<_> = Box::<std::vec::Vec<bool>>::default();
++ let _in_macro = outer!(Box::<String>::default());
++ let _string_default = outer!(Box::<String>::default());
+ let _vec2: Box<Vec<ImplementsDefault>> = Box::default();
+ let _vec3: Box<Vec<bool>> = Box::default();
++ let _vec4: Box<_> = Box::<Vec<bool>>::default();
+ let _more = ret_ty_fn();
+ call_ty_fn(Box::default());
+}
+
+fn ret_ty_fn() -> Box<bool> {
+ Box::<bool>::default()
+}
+
+#[allow(clippy::boxed_local)]
+fn call_ty_fn(_b: Box<u8>) {
+ issue_9621_dyn_trait();
+}
+
+use std::io::{Read, Result};
+
+impl Read for ImplementsDefault {
+ fn read(&mut self, _: &mut [u8]) -> Result<usize> {
+ Ok(0)
+ }
+}
+
+fn issue_9621_dyn_trait() {
+ let _: Box<dyn Read> = Box::<ImplementsDefault>::default();
++ issue_10089();
++}
++
++fn issue_10089() {
++ let _closure = || {
++ #[derive(Default)]
++ struct WeirdPathed;
++
++ let _ = Box::<WeirdPathed>::default();
++ };
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::box_default)]
+
+#[derive(Default)]
+struct ImplementsDefault;
+
+struct OwnDefault;
+
+impl OwnDefault {
+ fn default() -> Self {
+ Self
+ }
+}
+
+macro_rules! outer {
+ ($e: expr) => {
+ $e
+ };
+}
+
+fn main() {
+ let _string: Box<String> = Box::new(Default::default());
+ let _byte = Box::new(u8::default());
+ let _vec = Box::new(Vec::<u8>::new());
+ let _impl = Box::new(ImplementsDefault::default());
+ let _impl2 = Box::new(<ImplementsDefault as Default>::default());
+ let _impl3: Box<ImplementsDefault> = Box::new(Default::default());
+ let _own = Box::new(OwnDefault::default()); // should not lint
+ let _in_macro = outer!(Box::new(String::new()));
+ let _string_default = outer!(Box::new(String::from("")));
+ let _vec2: Box<Vec<ImplementsDefault>> = Box::new(vec![]);
+ let _vec3: Box<Vec<bool>> = Box::new(Vec::from([]));
+ let _vec4: Box<_> = Box::new(Vec::from([false; 0]));
+ let _more = ret_ty_fn();
+ call_ty_fn(Box::new(u8::default()));
+}
+
+fn ret_ty_fn() -> Box<bool> {
+ Box::new(bool::default())
+}
+
+#[allow(clippy::boxed_local)]
+fn call_ty_fn(_b: Box<u8>) {
+ issue_9621_dyn_trait();
+}
+
+use std::io::{Read, Result};
+
+impl Read for ImplementsDefault {
+ fn read(&mut self, _: &mut [u8]) -> Result<usize> {
+ Ok(0)
+ }
+}
+
+fn issue_9621_dyn_trait() {
+ let _: Box<dyn Read> = Box::new(ImplementsDefault::default());
++ issue_10089();
++}
++
++fn issue_10089() {
++ let _closure = || {
++ #[derive(Default)]
++ struct WeirdPathed;
++
++ let _ = Box::new(WeirdPathed::default());
++ };
+}
--- /dev/null
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::vec::Vec<u8>>::default()`
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:22:32
+ |
+LL | let _string: Box<String> = Box::new(Default::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+ |
+ = note: `-D clippy::box-default` implied by `-D warnings`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:23:17
+ |
+LL | let _byte = Box::new(u8::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<u8>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:24:16
+ |
+LL | let _vec = Box::new(Vec::<u8>::new());
- | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::string::String>::default()`
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<Vec<u8>>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:25:17
+ |
+LL | let _impl = Box::new(ImplementsDefault::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:26:18
+ |
+LL | let _impl2 = Box::new(<ImplementsDefault as Default>::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:27:42
+ |
+LL | let _impl3: Box<ImplementsDefault> = Box::new(Default::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:29:28
+ |
+LL | let _in_macro = outer!(Box::new(String::new()));
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::string::String>::default()`
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<String>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:30:34
+ |
+LL | let _string_default = outer!(Box::new(String::from("")));
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<std::vec::Vec<bool>>::default()`
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<String>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:31:46
+ |
+LL | let _vec2: Box<Vec<ImplementsDefault>> = Box::new(vec![]);
+ | ^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:32:33
+ |
+LL | let _vec3: Box<Vec<bool>> = Box::new(Vec::from([]));
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:33:25
+ |
+LL | let _vec4: Box<_> = Box::new(Vec::from([false; 0]));
- error: aborting due to 14 previous errors
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<Vec<bool>>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:35:16
+ |
+LL | call_ty_fn(Box::new(u8::default()));
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:39:5
+ |
+LL | Box::new(bool::default())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<bool>::default()`
+
+error: `Box::new(_)` of default value
+ --> $DIR/box_default.rs:56:28
+ |
+LL | let _: Box<dyn Read> = Box::new(ImplementsDefault::default());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<ImplementsDefault>::default()`
+
++error: `Box::new(_)` of default value
++ --> $DIR/box_default.rs:65:17
++ |
++LL | let _ = Box::new(WeirdPathed::default());
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Box::<WeirdPathed>::default()`
++
++error: aborting due to 15 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::case_sensitive_file_extension_comparisons)]
++
++use std::string::String;
++
++struct TestStruct;
++
++impl TestStruct {
++ fn ends_with(self, _arg: &str) {}
++}
++
++#[allow(dead_code)]
++fn is_rust_file(filename: &str) -> bool {
++ std::path::Path::new(filename)
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("rs"))
++}
++
++fn main() {
++ // std::string::String and &str should trigger the lint failure with .ext12
++ let _ = std::path::Path::new(&String::new())
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++ let _ = std::path::Path::new("str")
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++
++ // The fixup should preserve the indentation level
++ {
++ let _ = std::path::Path::new("str")
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++ }
++
++ // The test struct should not trigger the lint failure with .ext12
++ TestStruct {}.ends_with(".ext12");
++
++ // std::string::String and &str should trigger the lint failure with .EXT12
++ let _ = std::path::Path::new(&String::new())
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("EXT12"));
++ let _ = std::path::Path::new("str")
++ .extension()
++ .map_or(false, |ext| ext.eq_ignore_ascii_case("EXT12"));
++
++ // Should not trigger the lint failure because of the calls to to_lowercase and to_uppercase
++ let _ = String::new().to_lowercase().ends_with(".EXT12");
++ let _ = String::new().to_uppercase().ends_with(".EXT12");
++
++ // The test struct should not trigger the lint failure with .EXT12
++ TestStruct {}.ends_with(".EXT12");
++
++ // Should not trigger the lint failure with .eXT12
++ let _ = String::new().ends_with(".eXT12");
++ let _ = "str".ends_with(".eXT12");
++ TestStruct {}.ends_with(".eXT12");
++
++ // Should not trigger the lint failure with .EXT123 (too long)
++ let _ = String::new().ends_with(".EXT123");
++ let _ = "str".ends_with(".EXT123");
++ TestStruct {}.ends_with(".EXT123");
++
++ // Shouldn't fail if it doesn't start with a dot
++ let _ = String::new().ends_with("a.ext");
++ let _ = "str".ends_with("a.extA");
++ TestStruct {}.ends_with("a.ext");
++}
--- /dev/null
- fn ends_with(self, arg: &str) {}
++// run-rustfix
+#![warn(clippy::case_sensitive_file_extension_comparisons)]
+
+use std::string::String;
+
+struct TestStruct;
+
+impl TestStruct {
++ fn ends_with(self, _arg: &str) {}
+}
+
++#[allow(dead_code)]
+fn is_rust_file(filename: &str) -> bool {
+ filename.ends_with(".rs")
+}
+
+fn main() {
+ // std::string::String and &str should trigger the lint failure with .ext12
+ let _ = String::new().ends_with(".ext12");
+ let _ = "str".ends_with(".ext12");
+
++ // The fixup should preserve the indentation level
++ {
++ let _ = "str".ends_with(".ext12");
++ }
++
+ // The test struct should not trigger the lint failure with .ext12
+ TestStruct {}.ends_with(".ext12");
+
+ // std::string::String and &str should trigger the lint failure with .EXT12
+ let _ = String::new().ends_with(".EXT12");
+ let _ = "str".ends_with(".EXT12");
+
++ // Should not trigger the lint failure because of the calls to to_lowercase and to_uppercase
++ let _ = String::new().to_lowercase().ends_with(".EXT12");
++ let _ = String::new().to_uppercase().ends_with(".EXT12");
++
+ // The test struct should not trigger the lint failure with .EXT12
+ TestStruct {}.ends_with(".EXT12");
+
+ // Should not trigger the lint failure with .eXT12
+ let _ = String::new().ends_with(".eXT12");
+ let _ = "str".ends_with(".eXT12");
+ TestStruct {}.ends_with(".eXT12");
+
+ // Should not trigger the lint failure with .EXT123 (too long)
+ let _ = String::new().ends_with(".EXT123");
+ let _ = "str".ends_with(".EXT123");
+ TestStruct {}.ends_with(".EXT123");
+
+ // Shouldn't fail if it doesn't start with a dot
+ let _ = String::new().ends_with("a.ext");
+ let _ = "str".ends_with("a.extA");
+ TestStruct {}.ends_with("a.ext");
+}
--- /dev/null
- --> $DIR/case_sensitive_file_extension_comparisons.rs:12:14
+error: case-sensitive file extension comparison
- | ^^^^^^^^^^^^^^^^
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:14:5
+ |
+LL | filename.ends_with(".rs")
- --> $DIR/case_sensitive_file_extension_comparisons.rs:17:27
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider using a case-insensitive comparison instead
+ = note: `-D clippy::case-sensitive-file-extension-comparisons` implied by `-D warnings`
++help: use std::path::Path
++ |
++LL ~ std::path::Path::new(filename)
++LL + .extension()
++LL + .map_or(false, |ext| ext.eq_ignore_ascii_case("rs"))
++ |
+
+error: case-sensitive file extension comparison
- | ^^^^^^^^^^^^^^^^^^^
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:19:13
+ |
+LL | let _ = String::new().ends_with(".ext12");
- --> $DIR/case_sensitive_file_extension_comparisons.rs:18:19
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider using a case-insensitive comparison instead
++help: use std::path::Path
++ |
++LL ~ let _ = std::path::Path::new(&String::new())
++LL + .extension()
++LL ~ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++ |
+
+error: case-sensitive file extension comparison
- | ^^^^^^^^^^^^^^^^^^^
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:20:13
+ |
+LL | let _ = "str".ends_with(".ext12");
- --> $DIR/case_sensitive_file_extension_comparisons.rs:24:27
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider using a case-insensitive comparison instead
++help: use std::path::Path
++ |
++LL ~ let _ = std::path::Path::new("str")
++LL + .extension()
++LL ~ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++ |
+
+error: case-sensitive file extension comparison
- | ^^^^^^^^^^^^^^^^^^^
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:24:17
++ |
++LL | let _ = "str".ends_with(".ext12");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: consider using a case-insensitive comparison instead
++help: use std::path::Path
++ |
++LL ~ let _ = std::path::Path::new("str")
++LL + .extension()
++LL ~ .map_or(false, |ext| ext.eq_ignore_ascii_case("ext12"));
++ |
++
++error: case-sensitive file extension comparison
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:31:13
+ |
+LL | let _ = String::new().ends_with(".EXT12");
- --> $DIR/case_sensitive_file_extension_comparisons.rs:25:19
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider using a case-insensitive comparison instead
++help: use std::path::Path
++ |
++LL ~ let _ = std::path::Path::new(&String::new())
++LL + .extension()
++LL ~ .map_or(false, |ext| ext.eq_ignore_ascii_case("EXT12"));
++ |
+
+error: case-sensitive file extension comparison
- | ^^^^^^^^^^^^^^^^^^^
++ --> $DIR/case_sensitive_file_extension_comparisons.rs:32:13
+ |
+LL | let _ = "str".ends_with(".EXT12");
- error: aborting due to 5 previous errors
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider using a case-insensitive comparison instead
++help: use std::path::Path
++ |
++LL ~ let _ = std::path::Path::new("str")
++LL + .extension()
++LL ~ .map_or(false, |ext| ext.eq_ignore_ascii_case("EXT12"));
++ |
+
++error: aborting due to 6 previous errors
+
--- /dev/null
- error: using `clone` on type `std::option::Option<i32>` which implements the `Copy` trait
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:25:5
+ |
+LL | 42.clone();
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+ |
+ = note: `-D clippy::clone-on-copy` implied by `-D warnings`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:29:5
+ |
+LL | (&42).clone();
+ | ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:32:5
+ |
+LL | rc.borrow().clone();
+ | ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()`
+
+error: using `clone` on type `u32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:35:5
+ |
+LL | x.clone().rotate_left(1);
+ | ^^^^^^^^^ help: try removing the `clone` call: `x`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:49:5
+ |
+LL | m!(42).clone();
+ | ^^^^^^^^^^^^^^ help: try removing the `clone` call: `m!(42)`
+
+error: using `clone` on type `[u32; 2]` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:59:5
+ |
+LL | x.clone()[0];
+ | ^^^^^^^^^ help: try dereferencing it: `(*x)`
+
+error: using `clone` on type `char` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:69:14
+ |
+LL | is_ascii('z'.clone());
+ | ^^^^^^^^^^^ help: try removing the `clone` call: `'z'`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:73:14
+ |
+LL | vec.push(42.clone());
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+
++error: using `clone` on type `Option<i32>` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:77:17
+ |
+LL | let value = opt.clone()?; // operator precedence needed (*opt)?
+ | ^^^^^^^^^^^ help: try dereferencing it: `(*opt)`
+
+error: aborting due to 9 previous errors
+
--- /dev/null
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:5:22
+ |
+LL | if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::dbg-macro` implied by `-D warnings`
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | if let Some(n) = n.checked_sub(4) { n } else { n }
+ | ~~~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:9:8
+ |
+LL | if dbg!(n <= 1) {
+ | ^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | if n <= 1 {
+ | ~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:10:9
+ |
+LL | dbg!(1)
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 1
+ |
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:12:9
+ |
+LL | dbg!(n * factorial(n - 1))
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | n * factorial(n - 1)
+ |
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:17:5
+ |
+LL | dbg!(42);
+ | ^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 42;
+ | ~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:18:5
+ |
+LL | dbg!(dbg!(dbg!(42)));
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | dbg!(dbg!(42));
+ | ~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:19:14
+ |
+LL | foo(3) + dbg!(factorial(4));
+ | ^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | foo(3) + factorial(4);
+ | ~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:20:5
+ |
+LL | dbg!(1, 2, dbg!(3, 4));
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | (1, 2, dbg!(3, 4));
+ | ~~~~~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:21:5
+ |
+LL | dbg!(1, 2, 3, 4, 5);
+ | ^^^^^^^^^^^^^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | (1, 2, 3, 4, 5);
+ | ~~~~~~~~~~~~~~~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:41:9
+ |
+LL | dbg!(2);
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 2;
+ | ~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:47:5
+ |
+LL | dbg!(1);
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 1;
+ | ~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:52:5
+ |
+LL | dbg!(1);
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 1;
+ | ~
+
- error: `dbg!` macro is intended as a debugging tool
++error: the `dbg!` macro is intended as a debugging tool
+ --> $DIR/dbg_macro.rs:58:9
+ |
+LL | dbg!(1);
+ | ^^^^^^^
+ |
- help: ensure to avoid having uses of it in version control
++help: remove the invocation before committing it to a version control system
+ |
+LL | 1;
+ | ~
+
+error: aborting due to 13 previous errors
+
--- /dev/null
- let s1: String = std::string::String::default();
+// run-rustfix
+// aux-build: proc_macro_with_span.rs
+#![deny(clippy::default_trait_access)]
+#![allow(dead_code, unused_imports)]
+#![allow(clippy::uninlined_format_args)]
+
+extern crate proc_macro_with_span;
+
+use proc_macro_with_span::with_span;
+use std::default;
+use std::default::Default as D2;
+use std::string;
+
+fn main() {
- let s3: String = std::string::String::default();
++ let s1: String = String::default();
+
+ let s2 = String::default();
+
- let s4: String = std::string::String::default();
++ let s3: String = String::default();
+
- let s6: String = std::string::String::default();
++ let s4: String = String::default();
+
+ let s5 = string::String::default();
+
++ let s6: String = String::default();
+
+ let s7 = std::string::String::default();
+
+ let s8: String = DefaultFactory::make_t_badly();
+
+ let s9: String = DefaultFactory::make_t_nicely();
+
+ let s10 = DerivedDefault::default();
+
+ let s11: GenericDerivedDefault<String> = GenericDerivedDefault::default();
+
+ let s12 = GenericDerivedDefault::<String>::default();
+
+ let s13 = TupleDerivedDefault::default();
+
+ let s14: TupleDerivedDefault = TupleDerivedDefault::default();
+
+ let s15: ArrayDerivedDefault = ArrayDerivedDefault::default();
+
+ let s16 = ArrayDerivedDefault::default();
+
+ let s17: TupleStructDerivedDefault = TupleStructDerivedDefault::default();
+
+ let s18 = TupleStructDerivedDefault::default();
+
+ let s19 = <DerivedDefault as Default>::default();
+
+ let s20 = UpdateSyntax {
+ s: "foo",
+ ..Default::default()
+ };
+
+ let _s21: String = with_span!(s Default::default());
+
+ println!(
+ "[{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}]",
+ s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13, s14, s15, s16, s17, s18, s19, s20,
+ );
+}
+
+struct DefaultFactory;
+
+impl DefaultFactory {
+ pub fn make_t_badly<T: Default>() -> T {
+ Default::default()
+ }
+
+ pub fn make_t_nicely<T: Default>() -> T {
+ T::default()
+ }
+}
+
+#[derive(Debug, Default)]
+struct DerivedDefault {
+ pub s: String,
+}
+
+#[derive(Debug, Default)]
+struct GenericDerivedDefault<T: Default + std::fmt::Debug> {
+ pub s: T,
+}
+
+#[derive(Debug, Default)]
+struct TupleDerivedDefault {
+ pub s: (String, String),
+}
+
+#[derive(Debug, Default)]
+struct ArrayDerivedDefault {
+ pub s: [String; 10],
+}
+
+#[derive(Debug, Default)]
+struct TupleStructDerivedDefault(String);
+
+#[derive(Debug, Default)]
+struct UpdateSyntax {
+ pub s: &'static str,
+ pub u: u64,
+}
--- /dev/null
- error: calling `std::string::String::default()` is more clear than this expression
++error: calling `String::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:15:22
+ |
+LL | let s1: String = Default::default();
- | ^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
++ | ^^^^^^^^^^^^^^^^^^ help: try: `String::default()`
+ |
+note: the lint level is defined here
+ --> $DIR/default_trait_access.rs:3:9
+ |
+LL | #![deny(clippy::default_trait_access)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
- error: calling `std::string::String::default()` is more clear than this expression
++error: calling `String::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:19:22
+ |
+LL | let s3: String = D2::default();
- | ^^^^^^^^^^^^^ help: try: `std::string::String::default()`
++ | ^^^^^^^^^^^^^ help: try: `String::default()`
+
- error: calling `std::string::String::default()` is more clear than this expression
++error: calling `String::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:21:22
+ |
+LL | let s4: String = std::default::Default::default();
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `String::default()`
+
- error: calling `std::string::String::default()` is more clear than this expression
++error: calling `String::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:25:22
+ |
+LL | let s6: String = default::Default::default();
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `String::default()`
+
+error: calling `GenericDerivedDefault::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:35:46
+ |
+LL | let s11: GenericDerivedDefault<String> = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `GenericDerivedDefault::default()`
+
+error: calling `TupleDerivedDefault::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:41:36
+ |
+LL | let s14: TupleDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `TupleDerivedDefault::default()`
+
+error: calling `ArrayDerivedDefault::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:43:36
+ |
+LL | let s15: ArrayDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `ArrayDerivedDefault::default()`
+
+error: calling `TupleStructDerivedDefault::default()` is more clear than this expression
+ --> $DIR/default_trait_access.rs:47:42
+ |
+LL | let s17: TupleStructDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `TupleStructDerivedDefault::default()`
+
+error: aborting due to 8 previous errors
+
--- /dev/null
+// run-rustfix
+
+#![allow(dead_code)]
+
+use std::collections::HashMap;
+
+#[derive(Default)]
+struct FooDefault<'a> {
+ a: bool,
+ b: i32,
+ c: u64,
+ d: Vec<i32>,
+ e: FooND1,
+ f: FooND2,
+ g: HashMap<i32, i32>,
+ h: (i32, Vec<i32>),
+ i: [Vec<i32>; 3],
+ j: [i32; 5],
+ k: Option<i32>,
+ l: &'a [i32],
+}
+
+
+
+#[derive(Default)]
+struct TupleDefault(bool, i32, u64);
+
+
+
+struct FooND1 {
+ a: bool,
+}
+
+impl std::default::Default for FooND1 {
+ fn default() -> Self {
+ Self { a: true }
+ }
+}
+
+struct FooND2 {
+ a: i32,
+}
+
+impl std::default::Default for FooND2 {
+ fn default() -> Self {
+ Self { a: 5 }
+ }
+}
+
+struct FooNDNew {
+ a: bool,
+}
+
+impl FooNDNew {
+ fn new() -> Self {
+ Self { a: true }
+ }
+}
+
+impl Default for FooNDNew {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+struct FooNDVec(Vec<i32>);
+
+impl Default for FooNDVec {
+ fn default() -> Self {
+ Self(vec![5, 12])
+ }
+}
+
+#[derive(Default)]
+struct StrDefault<'a>(&'a str);
+
+
+
+#[derive(Default)]
+struct AlreadyDerived(i32, bool);
+
+macro_rules! mac {
+ () => {
+ 0
+ };
+ ($e:expr) => {
+ struct X(u32);
+ impl Default for X {
+ fn default() -> Self {
+ Self($e)
+ }
+ }
+ };
+}
+
+mac!(0);
+
+#[derive(Default)]
+struct Y(u32);
+
+
+struct RustIssue26925<T> {
+ a: Option<T>,
+}
+
+// We should watch out for cases where a manual impl is needed because a
+// derive adds different type bounds (https://github.com/rust-lang/rust/issues/26925).
+// For example, a struct with Option<T> does not require T: Default, but a derive adds
+// that type bound anyways. So until #26925 get fixed we should disable lint
+// for the following case
+impl<T> Default for RustIssue26925<T> {
+ fn default() -> Self {
+ Self { a: None }
+ }
+}
+
+struct SpecializedImpl<A, B> {
+ a: A,
+ b: B,
+}
+
+impl<T: Default> Default for SpecializedImpl<T, T> {
+ fn default() -> Self {
+ Self {
+ a: T::default(),
+ b: T::default(),
+ }
+ }
+}
+
+#[derive(Default)]
+struct WithoutSelfCurly {
+ a: bool,
+}
+
+
+
+#[derive(Default)]
+struct WithoutSelfParan(bool);
+
+
+
+// https://github.com/rust-lang/rust-clippy/issues/7655
+
+pub struct SpecializedImpl2<T> {
+ v: Vec<T>,
+}
+
+impl Default for SpecializedImpl2<String> {
+ fn default() -> Self {
+ Self { v: Vec::new() }
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7654
+
+pub struct Color {
+ pub r: u8,
+ pub g: u8,
+ pub b: u8,
+}
+
+/// `#000000`
+impl Default for Color {
+ fn default() -> Self {
+ Color { r: 0, g: 0, b: 0 }
+ }
+}
+
+pub struct Color2 {
+ pub r: u8,
+ pub g: u8,
+ pub b: u8,
+}
+
+impl Default for Color2 {
+ /// `#000000`
+ fn default() -> Self {
+ Self { r: 0, g: 0, b: 0 }
+ }
+}
+
+#[derive(Default)]
+pub struct RepeatDefault1 {
+ a: [i8; 32],
+}
+
+
+
+pub struct RepeatDefault2 {
+ a: [i8; 33],
+}
+
+impl Default for RepeatDefault2 {
+ fn default() -> Self {
+ RepeatDefault2 { a: [0; 33] }
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7753
+
+pub enum IntOrString {
+ Int(i32),
+ String(String),
+}
+
+impl Default for IntOrString {
+ fn default() -> Self {
+ IntOrString::Int(0)
+ }
+}
+
++#[derive(Default)]
++pub enum SimpleEnum {
++ Foo,
++ #[default]
++ Bar,
++}
++
++
++
++pub enum NonExhaustiveEnum {
++ Foo,
++ #[non_exhaustive]
++ Bar,
++}
++
++impl Default for NonExhaustiveEnum {
++ fn default() -> Self {
++ NonExhaustiveEnum::Bar
++ }
++}
++
+fn main() {}
--- /dev/null
+// run-rustfix
+
+#![allow(dead_code)]
+
+use std::collections::HashMap;
+
+struct FooDefault<'a> {
+ a: bool,
+ b: i32,
+ c: u64,
+ d: Vec<i32>,
+ e: FooND1,
+ f: FooND2,
+ g: HashMap<i32, i32>,
+ h: (i32, Vec<i32>),
+ i: [Vec<i32>; 3],
+ j: [i32; 5],
+ k: Option<i32>,
+ l: &'a [i32],
+}
+
+impl std::default::Default for FooDefault<'_> {
+ fn default() -> Self {
+ Self {
+ a: false,
+ b: 0,
+ c: 0u64,
+ d: vec![],
+ e: Default::default(),
+ f: FooND2::default(),
+ g: HashMap::new(),
+ h: (0, vec![]),
+ i: [vec![], vec![], vec![]],
+ j: [0; 5],
+ k: None,
+ l: &[],
+ }
+ }
+}
+
+struct TupleDefault(bool, i32, u64);
+
+impl std::default::Default for TupleDefault {
+ fn default() -> Self {
+ Self(false, 0, 0u64)
+ }
+}
+
+struct FooND1 {
+ a: bool,
+}
+
+impl std::default::Default for FooND1 {
+ fn default() -> Self {
+ Self { a: true }
+ }
+}
+
+struct FooND2 {
+ a: i32,
+}
+
+impl std::default::Default for FooND2 {
+ fn default() -> Self {
+ Self { a: 5 }
+ }
+}
+
+struct FooNDNew {
+ a: bool,
+}
+
+impl FooNDNew {
+ fn new() -> Self {
+ Self { a: true }
+ }
+}
+
+impl Default for FooNDNew {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+struct FooNDVec(Vec<i32>);
+
+impl Default for FooNDVec {
+ fn default() -> Self {
+ Self(vec![5, 12])
+ }
+}
+
+struct StrDefault<'a>(&'a str);
+
+impl Default for StrDefault<'_> {
+ fn default() -> Self {
+ Self("")
+ }
+}
+
+#[derive(Default)]
+struct AlreadyDerived(i32, bool);
+
+macro_rules! mac {
+ () => {
+ 0
+ };
+ ($e:expr) => {
+ struct X(u32);
+ impl Default for X {
+ fn default() -> Self {
+ Self($e)
+ }
+ }
+ };
+}
+
+mac!(0);
+
+struct Y(u32);
+impl Default for Y {
+ fn default() -> Self {
+ Self(mac!())
+ }
+}
+
+struct RustIssue26925<T> {
+ a: Option<T>,
+}
+
+// We should watch out for cases where a manual impl is needed because a
+// derive adds different type bounds (https://github.com/rust-lang/rust/issues/26925).
+// For example, a struct with Option<T> does not require T: Default, but a derive adds
+// that type bound anyways. So until #26925 get fixed we should disable lint
+// for the following case
+impl<T> Default for RustIssue26925<T> {
+ fn default() -> Self {
+ Self { a: None }
+ }
+}
+
+struct SpecializedImpl<A, B> {
+ a: A,
+ b: B,
+}
+
+impl<T: Default> Default for SpecializedImpl<T, T> {
+ fn default() -> Self {
+ Self {
+ a: T::default(),
+ b: T::default(),
+ }
+ }
+}
+
+struct WithoutSelfCurly {
+ a: bool,
+}
+
+impl Default for WithoutSelfCurly {
+ fn default() -> Self {
+ WithoutSelfCurly { a: false }
+ }
+}
+
+struct WithoutSelfParan(bool);
+
+impl Default for WithoutSelfParan {
+ fn default() -> Self {
+ WithoutSelfParan(false)
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7655
+
+pub struct SpecializedImpl2<T> {
+ v: Vec<T>,
+}
+
+impl Default for SpecializedImpl2<String> {
+ fn default() -> Self {
+ Self { v: Vec::new() }
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7654
+
+pub struct Color {
+ pub r: u8,
+ pub g: u8,
+ pub b: u8,
+}
+
+/// `#000000`
+impl Default for Color {
+ fn default() -> Self {
+ Color { r: 0, g: 0, b: 0 }
+ }
+}
+
+pub struct Color2 {
+ pub r: u8,
+ pub g: u8,
+ pub b: u8,
+}
+
+impl Default for Color2 {
+ /// `#000000`
+ fn default() -> Self {
+ Self { r: 0, g: 0, b: 0 }
+ }
+}
+
+pub struct RepeatDefault1 {
+ a: [i8; 32],
+}
+
+impl Default for RepeatDefault1 {
+ fn default() -> Self {
+ RepeatDefault1 { a: [0; 32] }
+ }
+}
+
+pub struct RepeatDefault2 {
+ a: [i8; 33],
+}
+
+impl Default for RepeatDefault2 {
+ fn default() -> Self {
+ RepeatDefault2 { a: [0; 33] }
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7753
+
+pub enum IntOrString {
+ Int(i32),
+ String(String),
+}
+
+impl Default for IntOrString {
+ fn default() -> Self {
+ IntOrString::Int(0)
+ }
+}
+
++pub enum SimpleEnum {
++ Foo,
++ Bar,
++}
++
++impl Default for SimpleEnum {
++ fn default() -> Self {
++ SimpleEnum::Bar
++ }
++}
++
++pub enum NonExhaustiveEnum {
++ Foo,
++ #[non_exhaustive]
++ Bar,
++}
++
++impl Default for NonExhaustiveEnum {
++ fn default() -> Self {
++ NonExhaustiveEnum::Bar
++ }
++}
++
+fn main() {}
--- /dev/null
- error: aborting due to 7 previous errors
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:22:1
+ |
+LL | / impl std::default::Default for FooDefault<'_> {
+LL | | fn default() -> Self {
+LL | | Self {
+LL | | a: false,
+... |
+LL | | }
+LL | | }
+ | |_^
+ |
+ = note: `-D clippy::derivable-impls` implied by `-D warnings`
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:43:1
+ |
+LL | / impl std::default::Default for TupleDefault {
+LL | | fn default() -> Self {
+LL | | Self(false, 0, 0u64)
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:95:1
+ |
+LL | / impl Default for StrDefault<'_> {
+LL | | fn default() -> Self {
+LL | | Self("")
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:121:1
+ |
+LL | / impl Default for Y {
+LL | | fn default() -> Self {
+LL | | Self(mac!())
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:160:1
+ |
+LL | / impl Default for WithoutSelfCurly {
+LL | | fn default() -> Self {
+LL | | WithoutSelfCurly { a: false }
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:168:1
+ |
+LL | / impl Default for WithoutSelfParan {
+LL | | fn default() -> Self {
+LL | | WithoutSelfParan(false)
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
+error: this `impl` can be derived
+ --> $DIR/derivable_impls.rs:218:1
+ |
+LL | / impl Default for RepeatDefault1 {
+LL | | fn default() -> Self {
+LL | | RepeatDefault1 { a: [0; 32] }
+LL | | }
+LL | | }
+ | |_^
+ |
+ = help: remove the manual implementation...
+help: ...and instead derive it
+ |
+LL | #[derive(Default)]
+ |
+
++error: this `impl` can be derived
++ --> $DIR/derivable_impls.rs:252:1
++ |
++LL | / impl Default for SimpleEnum {
++LL | | fn default() -> Self {
++LL | | SimpleEnum::Bar
++LL | | }
++LL | | }
++ | |_^
++ |
++ = help: remove the manual implementation...
++help: ...and instead derive it...
++ |
++LL | #[derive(Default)]
++ |
++help: ...and mark the default variant
++ |
++LL ~ #[default]
++LL ~ Bar,
++ |
++
++error: aborting due to 8 previous errors
+
--- /dev/null
+#![allow(dead_code)]
+#![warn(clippy::expl_impl_clone_on_copy)]
+
+
+#[derive(Copy)]
+struct Qux;
+
+impl Clone for Qux {
+ fn clone(&self) -> Self {
+ Qux
+ }
+}
+
+// looks like unions don't support deriving Clone for now
+#[derive(Copy)]
+union Union {
+ a: u8,
+}
+
+impl Clone for Union {
+ fn clone(&self) -> Self {
+ Union { a: 42 }
+ }
+}
+
+// See #666
+#[derive(Copy)]
+struct Lt<'a> {
+ a: &'a u8,
+}
+
+impl<'a> Clone for Lt<'a> {
+ fn clone(&self) -> Self {
+ unimplemented!()
+ }
+}
+
+#[derive(Copy)]
+struct BigArray {
+ a: [u8; 65],
+}
+
+impl Clone for BigArray {
+ fn clone(&self) -> Self {
+ unimplemented!()
+ }
+}
+
+#[derive(Copy)]
+struct FnPtr {
+ a: fn() -> !,
+}
+
+impl Clone for FnPtr {
+ fn clone(&self) -> Self {
+ unimplemented!()
+ }
+}
+
+// Ok, Clone trait impl doesn't have constrained generics.
+#[derive(Copy)]
+struct Generic<T> {
+ a: T,
+}
+
+impl<T> Clone for Generic<T> {
+ fn clone(&self) -> Self {
+ unimplemented!()
+ }
+}
+
+#[derive(Copy)]
+struct Generic2<T>(T);
+impl<T: Clone> Clone for Generic2<T> {
+ fn clone(&self) -> Self {
+ Self(self.0.clone())
+ }
+}
+
+// Ok, Clone trait impl doesn't have constrained generics.
+#[derive(Copy)]
+struct GenericRef<'a, T, U>(T, &'a U);
+impl<T: Clone, U> Clone for GenericRef<'_, T, U> {
+ fn clone(&self) -> Self {
+ Self(self.0.clone(), self.1)
+ }
+}
+
++// https://github.com/rust-lang/rust-clippy/issues/10188
++#[repr(packed)]
++#[derive(Copy)]
++struct Packed<T>(T);
++
++impl<T: Copy> Clone for Packed<T> {
++ fn clone(&self) -> Self {
++ *self
++ }
++}
++
+fn main() {}
--- /dev/null
--- /dev/null
++#![allow(clippy::derive_partial_eq_without_eq)]
++
++#[derive(PartialEq, Hash)]
++struct Foo;
++
++impl PartialEq<u64> for Foo {
++ fn eq(&self, _: &u64) -> bool {
++ true
++ }
++}
++
++#[derive(Hash)]
++struct Bar;
++
++impl PartialEq for Bar {
++ fn eq(&self, _: &Bar) -> bool {
++ true
++ }
++}
++
++#[derive(Hash)]
++struct Baz;
++
++impl PartialEq<Baz> for Baz {
++ fn eq(&self, _: &Baz) -> bool {
++ true
++ }
++}
++
++// Implementing `Hash` with a derived `PartialEq` is fine. See #2627
++
++#[derive(PartialEq)]
++struct Bah;
++
++impl std::hash::Hash for Bah {
++ fn hash<H: std::hash::Hasher>(&self, _: &mut H) {}
++}
++
++fn main() {}
--- /dev/null
--- /dev/null
++error: you are deriving `Hash` but have implemented `PartialEq` explicitly
++ --> $DIR/derived_hash_with_manual_eq.rs:12:10
++ |
++LL | #[derive(Hash)]
++ | ^^^^
++ |
++note: `PartialEq` implemented here
++ --> $DIR/derived_hash_with_manual_eq.rs:15:1
++ |
++LL | impl PartialEq for Bar {
++ | ^^^^^^^^^^^^^^^^^^^^^^
++ = note: `#[deny(clippy::derived_hash_with_manual_eq)]` on by default
++ = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: you are deriving `Hash` but have implemented `PartialEq` explicitly
++ --> $DIR/derived_hash_with_manual_eq.rs:21:10
++ |
++LL | #[derive(Hash)]
++ | ^^^^
++ |
++note: `PartialEq` implemented here
++ --> $DIR/derived_hash_with_manual_eq.rs:24:1
++ |
++LL | impl PartialEq<Baz> for Baz {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: aborting due to 2 previous errors
++
--- /dev/null
+#![warn(clippy::drop_ref)]
+#![allow(clippy::toplevel_ref_arg)]
+#![allow(clippy::map_err_ignore)]
+#![allow(clippy::unnecessary_wraps, clippy::drop_non_drop)]
+
+use std::mem::drop;
+
+struct SomeStruct;
+
+fn main() {
+ drop(&SomeStruct);
+
+ let mut owned1 = SomeStruct;
+ drop(&owned1);
+ drop(&&owned1);
+ drop(&mut owned1);
+ drop(owned1); //OK
+
+ let reference1 = &SomeStruct;
+ drop(reference1);
+
+ let reference2 = &mut SomeStruct;
+ drop(reference2);
+
+ let ref reference3 = SomeStruct;
+ drop(reference3);
+}
+
+#[allow(dead_code)]
+fn test_generic_fn_drop<T>(val: T) {
+ drop(&val);
+ drop(val); //OK
+}
+
+#[allow(dead_code)]
+fn test_similarly_named_function() {
+ fn drop<T>(_val: T) {}
+ drop(&SomeStruct); //OK; call to unrelated function which happens to have the same name
+ std::mem::drop(&SomeStruct);
+}
+
+#[derive(Copy, Clone)]
+pub struct Error;
+fn produce_half_owl_error() -> Result<(), Error> {
+ Ok(())
+}
+
+fn produce_half_owl_ok() -> Result<bool, ()> {
+ Ok(true)
+}
+
+#[allow(dead_code)]
+fn test_owl_result() -> Result<(), ()> {
+ produce_half_owl_error().map_err(|_| ())?;
+ produce_half_owl_ok().map(|_| ())?;
+ // the following should not be linted,
+ // we should not force users to use toilet closures
+ // to produce owl results when drop is more convenient
+ produce_half_owl_error().map_err(drop)?;
+ produce_half_owl_ok().map_err(drop)?;
+ Ok(())
+}
+
+#[allow(dead_code)]
+fn test_owl_result_2() -> Result<u8, ()> {
+ produce_half_owl_error().map_err(|_| ())?;
+ produce_half_owl_ok().map(|_| ())?;
+ // the following should not be linted,
+ // we should not force users to use toilet closures
+ // to produce owl results when drop is more convenient
+ produce_half_owl_error().map_err(drop)?;
+ produce_half_owl_ok().map(drop)?;
+ Ok(1)
+}
++
++#[allow(unused)]
++#[allow(clippy::unit_cmp)]
++fn issue10122(x: u8) {
++ // This is a function which returns a reference and has a side-effect, which means
++ // that calling drop() on the function is considered an idiomatic way of achieving the side-effect
++ // in a match arm.
++ fn println_and<T>(t: &T) -> &T {
++ println!("foo");
++ t
++ }
++
++ match x {
++ 0 => drop(println_and(&12)), // Don't lint (copy type), we only care about side-effects
++ 1 => drop(println_and(&String::new())), // Don't lint (no copy type), we only care about side-effects
++ 2 => {
++ drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
++ },
++ 3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
++ 4 => drop(&2), // Lint, not a fn/method call
++ _ => (),
++ }
++}
--- /dev/null
- error: aborting due to 9 previous errors
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:11:5
+ |
+LL | drop(&SomeStruct);
+ | ^^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&SomeStruct`
+ --> $DIR/drop_ref.rs:11:10
+ |
+LL | drop(&SomeStruct);
+ | ^^^^^^^^^^^
+ = note: `-D clippy::drop-ref` implied by `-D warnings`
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:14:5
+ |
+LL | drop(&owned1);
+ | ^^^^^^^^^^^^^
+ |
+note: argument has type `&SomeStruct`
+ --> $DIR/drop_ref.rs:14:10
+ |
+LL | drop(&owned1);
+ | ^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:15:5
+ |
+LL | drop(&&owned1);
+ | ^^^^^^^^^^^^^^
+ |
+note: argument has type `&&SomeStruct`
+ --> $DIR/drop_ref.rs:15:10
+ |
+LL | drop(&&owned1);
+ | ^^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:16:5
+ |
+LL | drop(&mut owned1);
+ | ^^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&mut SomeStruct`
+ --> $DIR/drop_ref.rs:16:10
+ |
+LL | drop(&mut owned1);
+ | ^^^^^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:20:5
+ |
+LL | drop(reference1);
+ | ^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&SomeStruct`
+ --> $DIR/drop_ref.rs:20:10
+ |
+LL | drop(reference1);
+ | ^^^^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:23:5
+ |
+LL | drop(reference2);
+ | ^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&mut SomeStruct`
+ --> $DIR/drop_ref.rs:23:10
+ |
+LL | drop(reference2);
+ | ^^^^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:26:5
+ |
+LL | drop(reference3);
+ | ^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&SomeStruct`
+ --> $DIR/drop_ref.rs:26:10
+ |
+LL | drop(reference3);
+ | ^^^^^^^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:31:5
+ |
+LL | drop(&val);
+ | ^^^^^^^^^^
+ |
+note: argument has type `&T`
+ --> $DIR/drop_ref.rs:31:10
+ |
+LL | drop(&val);
+ | ^^^^
+
+error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
+ --> $DIR/drop_ref.rs:39:5
+ |
+LL | std::mem::drop(&SomeStruct);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+note: argument has type `&SomeStruct`
+ --> $DIR/drop_ref.rs:39:20
+ |
+LL | std::mem::drop(&SomeStruct);
+ | ^^^^^^^^^^^
+
++error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
++ --> $DIR/drop_ref.rs:91:13
++ |
++LL | drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
++ | ^^^^^^^^^^^^^^^^^^^^^^
++ |
++note: argument has type `&i32`
++ --> $DIR/drop_ref.rs:91:18
++ |
++LL | drop(println_and(&13)); // Lint, even if we only care about the side-effect, it's already in a block
++ | ^^^^^^^^^^^^^^^^
++
++error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
++ --> $DIR/drop_ref.rs:93:14
++ |
++LL | 3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
++ | ^^^^^^^^^^^^^^^^^^^^^^
++ |
++note: argument has type `&i32`
++ --> $DIR/drop_ref.rs:93:19
++ |
++LL | 3 if drop(println_and(&14)) == () => (), // Lint, idiomatic use is only in body of `Arm`
++ | ^^^^^^^^^^^^^^^^
++
++error: calls to `std::mem::drop` with a reference instead of an owned value. Dropping a reference does nothing
++ --> $DIR/drop_ref.rs:94:14
++ |
++LL | 4 => drop(&2), // Lint, not a fn/method call
++ | ^^^^^^^^
++ |
++note: argument has type `&i32`
++ --> $DIR/drop_ref.rs:94:19
++ |
++LL | 4 => drop(&2), // Lint, not a fn/method call
++ | ^^
++
++error: aborting due to 12 previous errors
+
--- /dev/null
+// aux-build:proc_macro_derive.rs
+// aux-build:macro_rules.rs
+
+#![warn(clippy::field_reassign_with_default)]
+
+#[macro_use]
+extern crate proc_macro_derive;
+#[macro_use]
+extern crate macro_rules;
+
+// Don't lint on derives that derive `Default`
+// See https://github.com/rust-lang/rust-clippy/issues/6545
+#[derive(FieldReassignWithDefault)]
+struct DerivedStruct;
+
+#[derive(Default)]
+struct A {
+ i: i32,
+ j: i64,
+}
+
+struct B {
+ i: i32,
+ j: i64,
+}
+
+#[derive(Default)]
+struct C {
+ i: Vec<i32>,
+ j: i64,
+}
+
+#[derive(Default)]
+struct D {
+ a: Option<i32>,
+ b: Option<i32>,
+}
+
+macro_rules! m {
+ ($key:ident: $value:tt) => {{
+ let mut data = $crate::D::default();
+ data.$key = Some($value);
+ data
+ }};
+}
+
+/// Implements .next() that returns a different number each time.
+struct SideEffect(i32);
+
+impl SideEffect {
+ fn new() -> SideEffect {
+ SideEffect(0)
+ }
+ fn next(&mut self) -> i32 {
+ self.0 += 1;
+ self.0
+ }
+}
+
+fn main() {
+ // wrong, produces first error in stderr
+ let mut a: A = Default::default();
+ a.i = 42;
+
+ // right
+ let mut a: A = Default::default();
+
+ // right
+ let a = A {
+ i: 42,
+ ..Default::default()
+ };
+
+ // right
+ let mut a: A = Default::default();
+ if a.i == 0 {
+ a.j = 12;
+ }
+
+ // right
+ let mut a: A = Default::default();
+ let b = 5;
+
+ // right
+ let mut b = 32;
+ let mut a: A = Default::default();
+ b = 2;
+
+ // right
+ let b: B = B { i: 42, j: 24 };
+
+ // right
+ let mut b: B = B { i: 42, j: 24 };
+ b.i = 52;
+
+ // right
+ let mut b = B { i: 15, j: 16 };
+ let mut a: A = Default::default();
+ b.i = 2;
+
+ // wrong, produces second error in stderr
+ let mut a: A = Default::default();
+ a.j = 43;
+ a.i = 42;
+
+ // wrong, produces third error in stderr
+ let mut a: A = Default::default();
+ a.i = 42;
+ a.j = 43;
+ a.j = 44;
+
+ // wrong, produces fourth error in stderr
+ let mut a = A::default();
+ a.i = 42;
+
+ // wrong, but does not produce an error in stderr, because we can't produce a correct kind of
+ // suggestion with current implementation
+ let mut c: (i32, i32) = Default::default();
+ c.0 = 42;
+ c.1 = 21;
+
+ // wrong, produces the fifth error in stderr
+ let mut a: A = Default::default();
+ a.i = Default::default();
+
+ // wrong, produces the sixth error in stderr
+ let mut a: A = Default::default();
+ a.i = Default::default();
+ a.j = 45;
+
+ // right, because an assignment refers to another field
+ let mut x = A::default();
+ x.i = 42;
+ x.j = 21 + x.i as i64;
+
+ // right, we bail out if there's a reassignment to the same variable, since there is a risk of
+ // side-effects affecting the outcome
+ let mut x = A::default();
+ let mut side_effect = SideEffect::new();
+ x.i = side_effect.next();
+ x.j = 2;
+ x.i = side_effect.next();
+
+ // don't lint - some private fields
+ let mut x = m::F::default();
+ x.a = 1;
+
+ // don't expand macros in the suggestion (#6522)
+ let mut a: C = C::default();
+ a.i = vec![1];
+
+ // Don't lint in external macros
+ field_reassign_with_default!();
+
+ // be sure suggestion is correct with generics
+ let mut a: Wrapper<bool> = Default::default();
+ a.i = true;
+
+ let mut a: WrapperMulti<i32, i64> = Default::default();
+ a.i = 42;
+
+ // Don't lint in macros
+ m! {
+ a: 42
+ };
+}
+
+mod m {
+ #[derive(Default)]
+ pub struct F {
+ pub a: u64,
+ b: u64,
+ }
+}
+
+#[derive(Default)]
+struct Wrapper<T> {
+ i: T,
+}
+
+#[derive(Default)]
+struct WrapperMulti<T, U> {
+ i: T,
+ j: U,
+}
+
+mod issue6312 {
+ use std::sync::atomic::AtomicBool;
+ use std::sync::Arc;
+
+ // do not lint: type implements `Drop` but not all fields are `Copy`
+ #[derive(Clone, Default)]
+ pub struct ImplDropNotAllCopy {
+ name: String,
+ delay_data_sync: Arc<AtomicBool>,
+ }
+
+ impl Drop for ImplDropNotAllCopy {
+ fn drop(&mut self) {
+ self.close()
+ }
+ }
+
+ impl ImplDropNotAllCopy {
+ fn new(name: &str) -> Self {
+ let mut f = ImplDropNotAllCopy::default();
+ f.name = name.to_owned();
+ f
+ }
+ fn close(&self) {}
+ }
+
+ // lint: type implements `Drop` and all fields are `Copy`
+ #[derive(Clone, Default)]
+ pub struct ImplDropAllCopy {
+ name: usize,
+ delay_data_sync: bool,
+ }
+
+ impl Drop for ImplDropAllCopy {
+ fn drop(&mut self) {
+ self.close()
+ }
+ }
+
+ impl ImplDropAllCopy {
+ fn new(name: &str) -> Self {
+ let mut f = ImplDropAllCopy::default();
+ f.name = name.len();
+ f
+ }
+ fn close(&self) {}
+ }
+
+ // lint: type does not implement `Drop` though all fields are `Copy`
+ #[derive(Clone, Default)]
+ pub struct NoDropAllCopy {
+ name: usize,
+ delay_data_sync: bool,
+ }
+
+ impl NoDropAllCopy {
+ fn new(name: &str) -> Self {
+ let mut f = NoDropAllCopy::default();
+ f.name = name.len();
+ f
+ }
+ }
+}
++
++struct Collection {
++ items: Vec<i32>,
++ len: usize,
++}
++
++impl Default for Collection {
++ fn default() -> Self {
++ Self {
++ items: vec![1, 2, 3],
++ len: 0,
++ }
++ }
++}
++
++#[allow(clippy::redundant_closure_call)]
++fn issue10136() {
++ let mut c = Collection::default();
++ // don't lint, since c.items was used to calculate this value
++ c.len = (|| c.items.len())();
++}
--- /dev/null
- #![allow(clippy::redundant_clone)]
- #![allow(clippy::suspicious_map)]
- #![allow(clippy::map_identity)]
+// run-rustfix
+
+#![warn(clippy::iter_kv_map)]
++#![allow(unused_mut, clippy::redundant_clone, clippy::suspicious_map, clippy::map_identity)]
+
+use std::collections::{BTreeMap, HashMap};
+
+fn main() {
+ let get_key = |(key, _val)| key;
++ fn ref_acceptor(v: &u32) -> u32 {
++ *v
++ }
+
+ let map: HashMap<u32, u32> = HashMap::new();
+
+ let _ = map.keys().collect::<Vec<_>>();
+ let _ = map.values().collect::<Vec<_>>();
+ let _ = map.values().map(|v| v + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_keys().collect::<Vec<_>>();
+ let _ = map.clone().into_keys().map(|key| key + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_values().collect::<Vec<_>>();
+ let _ = map.clone().into_values().map(|val| val + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().values().collect::<Vec<_>>();
+ let _ = map.keys().filter(|x| *x % 2 == 0).count();
+
+ // Don't lint
+ let _ = map.iter().filter(|(_, val)| *val % 2 == 0).map(|(key, _)| key).count();
+ let _ = map.iter().map(get_key).collect::<Vec<_>>();
+
+ // Linting the following could be an improvement to the lint
+ // map.iter().filter_map(|(_, val)| (val % 2 == 0).then(val * 17)).count();
+
+ // Lint
+ let _ = map.keys().map(|key| key * 9).count();
+ let _ = map.values().map(|value| value * 17).count();
+
++ // Preserve the ref in the fix.
++ let _ = map.clone().into_values().map(|ref val| ref_acceptor(val)).count();
++
++ // Preserve the mut in the fix.
++ let _ = map
++ .clone().into_values().map(|mut val| {
++ val += 2;
++ val
++ })
++ .count();
++
++ // Don't let a mut interfere.
++ let _ = map.clone().into_values().count();
++
+ let map: BTreeMap<u32, u32> = BTreeMap::new();
+
+ let _ = map.keys().collect::<Vec<_>>();
+ let _ = map.values().collect::<Vec<_>>();
+ let _ = map.values().map(|v| v + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_keys().collect::<Vec<_>>();
+ let _ = map.clone().into_keys().map(|key| key + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_values().collect::<Vec<_>>();
+ let _ = map.clone().into_values().map(|val| val + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().values().collect::<Vec<_>>();
+ let _ = map.keys().filter(|x| *x % 2 == 0).count();
+
+ // Don't lint
+ let _ = map.iter().filter(|(_, val)| *val % 2 == 0).map(|(key, _)| key).count();
+ let _ = map.iter().map(get_key).collect::<Vec<_>>();
+
+ // Linting the following could be an improvement to the lint
+ // map.iter().filter_map(|(_, val)| (val % 2 == 0).then(val * 17)).count();
+
+ // Lint
+ let _ = map.keys().map(|key| key * 9).count();
+ let _ = map.values().map(|value| value * 17).count();
++
++ // Preserve the ref in the fix.
++ let _ = map.clone().into_values().map(|ref val| ref_acceptor(val)).count();
++
++ // Preserve the mut in the fix.
++ let _ = map
++ .clone().into_values().map(|mut val| {
++ val += 2;
++ val
++ })
++ .count();
++
++ // Don't let a mut interfere.
++ let _ = map.clone().into_values().count();
+}
--- /dev/null
- #![allow(clippy::redundant_clone)]
- #![allow(clippy::suspicious_map)]
- #![allow(clippy::map_identity)]
+// run-rustfix
+
+#![warn(clippy::iter_kv_map)]
++#![allow(unused_mut, clippy::redundant_clone, clippy::suspicious_map, clippy::map_identity)]
+
+use std::collections::{BTreeMap, HashMap};
+
+fn main() {
+ let get_key = |(key, _val)| key;
++ fn ref_acceptor(v: &u32) -> u32 {
++ *v
++ }
+
+ let map: HashMap<u32, u32> = HashMap::new();
+
+ let _ = map.iter().map(|(key, _)| key).collect::<Vec<_>>();
+ let _ = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
+ let _ = map.iter().map(|(_, v)| v + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_iter().map(|(key, _)| key).collect::<Vec<_>>();
+ let _ = map.clone().into_iter().map(|(key, _)| key + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_iter().map(|(_, val)| val).collect::<Vec<_>>();
+ let _ = map.clone().into_iter().map(|(_, val)| val + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().iter().map(|(_, val)| val).collect::<Vec<_>>();
+ let _ = map.iter().map(|(key, _)| key).filter(|x| *x % 2 == 0).count();
+
+ // Don't lint
+ let _ = map.iter().filter(|(_, val)| *val % 2 == 0).map(|(key, _)| key).count();
+ let _ = map.iter().map(get_key).collect::<Vec<_>>();
+
+ // Linting the following could be an improvement to the lint
+ // map.iter().filter_map(|(_, val)| (val % 2 == 0).then(val * 17)).count();
+
+ // Lint
+ let _ = map.iter().map(|(key, _value)| key * 9).count();
+ let _ = map.iter().map(|(_key, value)| value * 17).count();
+
++ // Preserve the ref in the fix.
++ let _ = map.clone().into_iter().map(|(_, ref val)| ref_acceptor(val)).count();
++
++ // Preserve the mut in the fix.
++ let _ = map
++ .clone()
++ .into_iter()
++ .map(|(_, mut val)| {
++ val += 2;
++ val
++ })
++ .count();
++
++ // Don't let a mut interfere.
++ let _ = map.clone().into_iter().map(|(_, mut val)| val).count();
++
+ let map: BTreeMap<u32, u32> = BTreeMap::new();
+
+ let _ = map.iter().map(|(key, _)| key).collect::<Vec<_>>();
+ let _ = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
+ let _ = map.iter().map(|(_, v)| v + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_iter().map(|(key, _)| key).collect::<Vec<_>>();
+ let _ = map.clone().into_iter().map(|(key, _)| key + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().into_iter().map(|(_, val)| val).collect::<Vec<_>>();
+ let _ = map.clone().into_iter().map(|(_, val)| val + 2).collect::<Vec<_>>();
+
+ let _ = map.clone().iter().map(|(_, val)| val).collect::<Vec<_>>();
+ let _ = map.iter().map(|(key, _)| key).filter(|x| *x % 2 == 0).count();
+
+ // Don't lint
+ let _ = map.iter().filter(|(_, val)| *val % 2 == 0).map(|(key, _)| key).count();
+ let _ = map.iter().map(get_key).collect::<Vec<_>>();
+
+ // Linting the following could be an improvement to the lint
+ // map.iter().filter_map(|(_, val)| (val % 2 == 0).then(val * 17)).count();
+
+ // Lint
+ let _ = map.iter().map(|(key, _value)| key * 9).count();
+ let _ = map.iter().map(|(_key, value)| value * 17).count();
++
++ // Preserve the ref in the fix.
++ let _ = map.clone().into_iter().map(|(_, ref val)| ref_acceptor(val)).count();
++
++ // Preserve the mut in the fix.
++ let _ = map
++ .clone()
++ .into_iter()
++ .map(|(_, mut val)| {
++ val += 2;
++ val
++ })
++ .count();
++
++ // Don't let a mut interfere.
++ let _ = map.clone().into_iter().map(|(_, mut val)| val).count();
+}
--- /dev/null
- --> $DIR/iter_kv_map.rs:15:13
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:16:13
++ --> $DIR/iter_kv_map.rs:16:13
+ |
+LL | let _ = map.iter().map(|(key, _)| key).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys()`
+ |
+ = note: `-D clippy::iter-kv-map` implied by `-D warnings`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:17:13
++ --> $DIR/iter_kv_map.rs:17:13
+ |
+LL | let _ = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values()`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:19:13
++ --> $DIR/iter_kv_map.rs:18:13
+ |
+LL | let _ = map.iter().map(|(_, v)| v + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values().map(|v| v + 2)`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:20:13
++ --> $DIR/iter_kv_map.rs:20:13
+ |
+LL | let _ = map.clone().into_iter().map(|(key, _)| key).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_keys()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:22:13
++ --> $DIR/iter_kv_map.rs:21:13
+ |
+LL | let _ = map.clone().into_iter().map(|(key, _)| key + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_keys().map(|key| key + 2)`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:23:13
++ --> $DIR/iter_kv_map.rs:23:13
+ |
+LL | let _ = map.clone().into_iter().map(|(_, val)| val).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values()`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:25:13
++ --> $DIR/iter_kv_map.rs:24:13
+ |
+LL | let _ = map.clone().into_iter().map(|(_, val)| val + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values().map(|val| val + 2)`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:26:13
++ --> $DIR/iter_kv_map.rs:26:13
+ |
+LL | let _ = map.clone().iter().map(|(_, val)| val).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().values()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:36:13
++ --> $DIR/iter_kv_map.rs:27:13
+ |
+LL | let _ = map.iter().map(|(key, _)| key).filter(|x| *x % 2 == 0).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:37:13
++ --> $DIR/iter_kv_map.rs:37:13
+ |
+LL | let _ = map.iter().map(|(key, _value)| key * 9).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys().map(|key| key * 9)`
+
+error: iterating on a map's values
- error: iterating on a map's keys
++ --> $DIR/iter_kv_map.rs:38:13
+ |
+LL | let _ = map.iter().map(|(_key, value)| value * 17).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values().map(|value| value * 17)`
+
- --> $DIR/iter_kv_map.rs:42:13
++error: iterating on a map's values
+ --> $DIR/iter_kv_map.rs:41:13
+ |
++LL | let _ = map.clone().into_iter().map(|(_, ref val)| ref_acceptor(val)).count();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values().map(|ref val| ref_acceptor(val))`
++
++error: iterating on a map's values
++ --> $DIR/iter_kv_map.rs:44:13
++ |
++LL | let _ = map
++ | _____________^
++LL | | .clone()
++LL | | .into_iter()
++LL | | .map(|(_, mut val)| {
++LL | | val += 2;
++LL | | val
++LL | | })
++ | |__________^
++ |
++help: try
++ |
++LL ~ let _ = map
++LL + .clone().into_values().map(|mut val| {
++LL + val += 2;
++LL + val
++LL + })
++ |
++
++error: iterating on a map's values
++ --> $DIR/iter_kv_map.rs:54:13
++ |
++LL | let _ = map.clone().into_iter().map(|(_, mut val)| val).count();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values()`
++
++error: iterating on a map's keys
++ --> $DIR/iter_kv_map.rs:58:13
++ |
+LL | let _ = map.iter().map(|(key, _)| key).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys()`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:43:13
++ --> $DIR/iter_kv_map.rs:59:13
+ |
+LL | let _ = map.iter().map(|(_, value)| value).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values()`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:45:13
++ --> $DIR/iter_kv_map.rs:60:13
+ |
+LL | let _ = map.iter().map(|(_, v)| v + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values().map(|v| v + 2)`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:46:13
++ --> $DIR/iter_kv_map.rs:62:13
+ |
+LL | let _ = map.clone().into_iter().map(|(key, _)| key).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_keys()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:48:13
++ --> $DIR/iter_kv_map.rs:63:13
+ |
+LL | let _ = map.clone().into_iter().map(|(key, _)| key + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_keys().map(|key| key + 2)`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:49:13
++ --> $DIR/iter_kv_map.rs:65:13
+ |
+LL | let _ = map.clone().into_iter().map(|(_, val)| val).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values()`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:51:13
++ --> $DIR/iter_kv_map.rs:66:13
+ |
+LL | let _ = map.clone().into_iter().map(|(_, val)| val + 2).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values().map(|val| val + 2)`
+
+error: iterating on a map's values
- --> $DIR/iter_kv_map.rs:52:13
++ --> $DIR/iter_kv_map.rs:68:13
+ |
+LL | let _ = map.clone().iter().map(|(_, val)| val).collect::<Vec<_>>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().values()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:62:13
++ --> $DIR/iter_kv_map.rs:69:13
+ |
+LL | let _ = map.iter().map(|(key, _)| key).filter(|x| *x % 2 == 0).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys()`
+
+error: iterating on a map's keys
- --> $DIR/iter_kv_map.rs:63:13
++ --> $DIR/iter_kv_map.rs:79:13
+ |
+LL | let _ = map.iter().map(|(key, _value)| key * 9).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.keys().map(|key| key * 9)`
+
+error: iterating on a map's values
- error: aborting due to 22 previous errors
++ --> $DIR/iter_kv_map.rs:80:13
+ |
+LL | let _ = map.iter().map(|(_key, value)| value * 17).count();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.values().map(|value| value * 17)`
+
++error: iterating on a map's values
++ --> $DIR/iter_kv_map.rs:83:13
++ |
++LL | let _ = map.clone().into_iter().map(|(_, ref val)| ref_acceptor(val)).count();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values().map(|ref val| ref_acceptor(val))`
++
++error: iterating on a map's values
++ --> $DIR/iter_kv_map.rs:86:13
++ |
++LL | let _ = map
++ | _____________^
++LL | | .clone()
++LL | | .into_iter()
++LL | | .map(|(_, mut val)| {
++LL | | val += 2;
++LL | | val
++LL | | })
++ | |__________^
++ |
++help: try
++ |
++LL ~ let _ = map
++LL + .clone().into_values().map(|mut val| {
++LL + val += 2;
++LL + val
++LL + })
++ |
++
++error: iterating on a map's values
++ --> $DIR/iter_kv_map.rs:96:13
++ |
++LL | let _ = map.clone().into_iter().map(|(_, mut val)| val).count();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `map.clone().into_values()`
++
++error: aborting due to 28 previous errors
+
--- /dev/null
- #![feature(custom_inner_attributes, lint_reasons, rustc_private)]
+// run-rustfix
-
- extern crate rustc_lint;
- extern crate rustc_span;
-
- #[allow(dead_code)]
- mod span_lint {
- use rustc_lint::{LateContext, Lint, LintContext};
- fn foo(cx: &LateContext<'_>, lint: &'static Lint) {
- cx.struct_span_lint(lint, rustc_span::Span::default(), "", |diag| diag.note(String::new()));
- }
- }
++#![feature(lint_reasons)]
+#![allow(
+ unused,
+ clippy::uninlined_format_args,
+ clippy::unnecessary_mut_passed,
+ clippy::unnecessary_to_owned
+)]
+#![warn(clippy::needless_borrow)]
+
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &a
+ },
+ 46 => &a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&a);
+ let _ = x(&a);
+ let _ = x(&mut b);
+ let _ = x(ref_a);
+ {
+ let b = &mut b;
+ x(b);
+ }
+
+ // Issue #8191
+ let mut x = 5;
+ let mut x = &mut x;
+
+ mut_ref(x);
+ mut_ref(x);
+ let y: &mut i32 = x;
+ let y: &mut i32 = x;
+
+ let y = match 0 {
+ // Don't lint. Removing the borrow would move 'x'
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ let y: &mut i32 = match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => x,
+ _ => &mut *x,
+ };
+ fn ref_mut_i32(_: &mut i32) {}
+ ref_mut_i32(match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => x,
+ _ => &mut *x,
+ });
+ // use 'x' after to make sure it's still usable in the fixed code.
+ *x = 5;
+
+ let s = String::new();
+ // let _ = (&s).len();
+ // let _ = (&s).capacity();
+ // let _ = (&&s).capacity();
+
+ let x = (1, 2);
+ let _ = x.0;
+ let x = &x as *const (i32, i32);
+ let _ = unsafe { (*x).0 };
+
+ // Issue #8367
+ trait Foo {
+ fn foo(self);
+ }
+ impl Foo for &'_ () {
+ fn foo(self) {}
+ }
+ (&()).foo(); // Don't lint. `()` doesn't implement `Foo`
+ (&()).foo();
+
+ impl Foo for i32 {
+ fn foo(self) {}
+ }
+ impl Foo for &'_ i32 {
+ fn foo(self) {}
+ }
+ (&5).foo(); // Don't lint. `5` will call `<i32 as Foo>::foo`
+ (&5).foo();
+
+ trait FooRef {
+ fn foo_ref(&self);
+ }
+ impl FooRef for () {
+ fn foo_ref(&self) {}
+ }
+ impl FooRef for &'_ () {
+ fn foo_ref(&self) {}
+ }
+ (&&()).foo_ref(); // Don't lint. `&()` will call `<() as FooRef>::foo_ref`
+
+ struct S;
+ impl From<S> for u32 {
+ fn from(s: S) -> Self {
+ (&s).into()
+ }
+ }
+ impl From<&S> for u32 {
+ fn from(s: &S) -> Self {
+ 0
+ }
+ }
+
+ let _ = std::process::Command::new("ls").args(["-a", "-l"]).status().unwrap();
+ let _ = std::path::Path::new(".").join(".");
+ deref_target_is_x(X);
+ multiple_constraints([[""]]);
+ multiple_constraints_normalizes_to_same(X, X);
+ let _ = Some("").unwrap_or("");
+ let _ = std::fs::write("x", "".to_string());
+
+ only_sized(&""); // Don't lint. `Sized` is only bound
+ let _ = std::any::Any::type_id(&""); // Don't lint. `Any` is only bound
+ let _ = Box::new(&""); // Don't lint. Type parameter appears in return type
+ ref_as_ref_path(&""); // Don't lint. Argument type is not a type parameter
+ refs_only(&()); // Don't lint. `&T` implements trait, but `T` doesn't
+ multiple_constraints_normalizes_to_different(&[[""]], &[""]); // Don't lint. Projected type appears in arguments
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
+
+mod issue9160 {
+ pub struct S<F> {
+ f: F,
+ }
+
+ impl<T, F> S<F>
+ where
+ F: Fn() -> T,
+ {
+ fn calls_field(&self) -> T {
+ (self.f)()
+ }
+ }
+
+ impl<T, F> S<F>
+ where
+ F: FnMut() -> T,
+ {
+ fn calls_mut_field(&mut self) -> T {
+ (self.f)()
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+struct X;
+
+impl std::ops::Deref for X {
+ type Target = X;
+ fn deref(&self) -> &Self::Target {
+ self
+ }
+}
+
+fn deref_target_is_x<T>(_: T)
+where
+ T: std::ops::Deref<Target = X>,
+{
+}
+
+fn multiple_constraints<T, U, V, X, Y>(_: T)
+where
+ T: IntoIterator<Item = U> + IntoIterator<Item = X>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+ X: IntoIterator<Item = Y>,
+ Y: AsRef<std::ffi::OsStr>,
+{
+}
+
+fn multiple_constraints_normalizes_to_same<T, U, V>(_: T, _: V)
+where
+ T: std::ops::Deref<Target = U>,
+ U: std::ops::Deref<Target = V>,
+{
+}
+
+fn only_sized<T>(_: T) {}
+
+fn ref_as_ref_path<T: 'static>(_: &'static T)
+where
+ &'static T: AsRef<std::path::Path>,
+{
+}
+
+trait RefsOnly {
+ type Referent;
+}
+
+impl<T> RefsOnly for &T {
+ type Referent = T;
+}
+
+fn refs_only<T, U>(_: T)
+where
+ T: RefsOnly<Referent = U>,
+{
+}
+
+fn multiple_constraints_normalizes_to_different<T, U, V>(_: T, _: U)
+where
+ T: IntoIterator<Item = U>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+{
+}
+
+// https://github.com/rust-lang/rust-clippy/pull/9136#pullrequestreview-1037379321
+mod copyable_iterator {
+ #[derive(Clone, Copy)]
+ struct Iter;
+ impl Iterator for Iter {
+ type Item = ();
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
+ }
+ fn takes_iter(_: impl Iterator) {}
+ fn dont_warn(mut x: Iter) {
+ takes_iter(&mut x);
+ }
+ #[allow(unused_mut)]
+ fn warn(mut x: &mut Iter) {
+ takes_iter(x)
+ }
+}
+
+#[clippy::msrv = "1.52.0"]
+mod under_msrv {
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+#[clippy::msrv = "1.53.0"]
+mod meets_msrv {
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(["-a", "-l"]).status().unwrap();
+ }
+}
+
+fn issue9383() {
+ // Should not lint because unions need explicit deref when accessing field
+ use std::mem::ManuallyDrop;
+
+ union Coral {
+ crab: ManuallyDrop<Vec<i32>>,
+ }
+
+ union Ocean {
+ coral: ManuallyDrop<Coral>,
+ }
+
+ let mut ocean = Ocean {
+ coral: ManuallyDrop::new(Coral {
+ crab: ManuallyDrop::new(vec![1, 2, 3]),
+ }),
+ };
+
+ unsafe {
+ ManuallyDrop::drop(&mut (&mut ocean.coral).crab);
+
+ (*ocean.coral).crab = ManuallyDrop::new(vec![4, 5, 6]);
+ ManuallyDrop::drop(&mut (*ocean.coral).crab);
+
+ ManuallyDrop::drop(&mut ocean.coral);
+ }
+}
+
+fn closure_test() {
+ let env = "env".to_owned();
+ let arg = "arg".to_owned();
+ let f = |arg| {
+ let loc = "loc".to_owned();
+ let _ = std::fs::write("x", &env); // Don't lint. In environment
+ let _ = std::fs::write("x", arg);
+ let _ = std::fs::write("x", loc);
+ };
+ let _ = std::fs::write("x", &env); // Don't lint. Borrowed by `f`
+ f(arg);
+}
+
+mod significant_drop {
+ #[derive(Debug)]
+ struct X;
+
+ #[derive(Debug)]
+ struct Y;
+
+ impl Drop for Y {
+ fn drop(&mut self) {}
+ }
+
+ fn foo(x: X, y: Y) {
+ debug(x);
+ debug(&y); // Don't lint. Has significant drop
+ }
+
+ fn debug(_: impl std::fmt::Debug) {}
+}
+
+mod used_exactly_once {
+ fn foo(x: String) {
+ use_x(x);
+ }
+ fn use_x(_: impl AsRef<str>) {}
+}
+
+mod used_more_than_once {
+ fn foo(x: String) {
+ use_x(&x);
+ use_x_again(&x);
+ }
+ fn use_x(_: impl AsRef<str>) {}
+ fn use_x_again(_: impl AsRef<str>) {}
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/9111#issuecomment-1277114280
+mod issue_9111 {
+ struct A;
+
+ impl Extend<u8> for A {
+ fn extend<T: IntoIterator<Item = u8>>(&mut self, _: T) {
+ unimplemented!()
+ }
+ }
+
+ impl<'a> Extend<&'a u8> for A {
+ fn extend<T: IntoIterator<Item = &'a u8>>(&mut self, _: T) {
+ unimplemented!()
+ }
+ }
+
+ fn main() {
+ let mut a = A;
+ a.extend(&[]); // vs a.extend([]);
+ }
+}
+
+mod issue_9710 {
+ fn main() {
+ let string = String::new();
+ for _i in 0..10 {
+ f(&string);
+ }
+ }
+
+ fn f<T: AsRef<str>>(_: T) {}
+}
+
+mod issue_9739 {
+ fn foo<D: std::fmt::Display>(_it: impl IntoIterator<Item = D>) {}
+
+ fn main() {
+ foo(if std::env::var_os("HI").is_some() {
+ &[0]
+ } else {
+ &[] as &[u32]
+ });
+ }
+}
+
+mod issue_9739_method_variant {
+ struct S;
+
+ impl S {
+ fn foo<D: std::fmt::Display>(&self, _it: impl IntoIterator<Item = D>) {}
+ }
+
+ fn main() {
+ S.foo(if std::env::var_os("HI").is_some() {
+ &[0]
+ } else {
+ &[] as &[u32]
+ });
+ }
+}
+
+mod issue_9782 {
+ fn foo<T: AsRef<[u8]>>(t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ // 100
+ foo::<[u8; 100]>(a);
+ foo(a);
+
+ // 16
+ foo::<&[u8]>(&a);
+ foo(a.as_slice());
+
+ // 8
+ foo::<&[u8; 100]>(&a);
+ foo(a);
+ }
+}
+
+mod issue_9782_type_relative_variant {
+ struct S;
+
+ impl S {
+ fn foo<T: AsRef<[u8]>>(t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ S::foo::<&[u8; 100]>(&a);
+ }
+}
+
+mod issue_9782_method_variant {
+ struct S;
+
+ impl S {
+ fn foo<T: AsRef<[u8]>>(&self, t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ S.foo::<&[u8; 100]>(&a);
+ }
+}
--- /dev/null
- #![feature(custom_inner_attributes, lint_reasons, rustc_private)]
+// run-rustfix
-
- extern crate rustc_lint;
- extern crate rustc_span;
-
- #[allow(dead_code)]
- mod span_lint {
- use rustc_lint::{LateContext, Lint, LintContext};
- fn foo(cx: &LateContext<'_>, lint: &'static Lint) {
- cx.struct_span_lint(lint, rustc_span::Span::default(), "", |diag| diag.note(&String::new()));
- }
- }
++#![feature(lint_reasons)]
+#![allow(
+ unused,
+ clippy::uninlined_format_args,
+ clippy::unnecessary_mut_passed,
+ clippy::unnecessary_to_owned
+)]
+#![warn(clippy::needless_borrow)]
+
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut &mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &&a
+ },
+ 46 => &&a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break &ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&&&a);
+ let _ = x(&mut &&a);
+ let _ = x(&&&mut b);
+ let _ = x(&&ref_a);
+ {
+ let b = &mut b;
+ x(&b);
+ }
+
+ // Issue #8191
+ let mut x = 5;
+ let mut x = &mut x;
+
+ mut_ref(&mut x);
+ mut_ref(&mut &mut x);
+ let y: &mut i32 = &mut x;
+ let y: &mut i32 = &mut &mut x;
+
+ let y = match 0 {
+ // Don't lint. Removing the borrow would move 'x'
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ let y: &mut i32 = match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => &mut x,
+ _ => &mut *x,
+ };
+ fn ref_mut_i32(_: &mut i32) {}
+ ref_mut_i32(match 0 {
+ // Lint here. The type given above triggers auto-borrow.
+ 0 => &mut x,
+ _ => &mut *x,
+ });
+ // use 'x' after to make sure it's still usable in the fixed code.
+ *x = 5;
+
+ let s = String::new();
+ // let _ = (&s).len();
+ // let _ = (&s).capacity();
+ // let _ = (&&s).capacity();
+
+ let x = (1, 2);
+ let _ = (&x).0;
+ let x = &x as *const (i32, i32);
+ let _ = unsafe { (&*x).0 };
+
+ // Issue #8367
+ trait Foo {
+ fn foo(self);
+ }
+ impl Foo for &'_ () {
+ fn foo(self) {}
+ }
+ (&()).foo(); // Don't lint. `()` doesn't implement `Foo`
+ (&&()).foo();
+
+ impl Foo for i32 {
+ fn foo(self) {}
+ }
+ impl Foo for &'_ i32 {
+ fn foo(self) {}
+ }
+ (&5).foo(); // Don't lint. `5` will call `<i32 as Foo>::foo`
+ (&&5).foo();
+
+ trait FooRef {
+ fn foo_ref(&self);
+ }
+ impl FooRef for () {
+ fn foo_ref(&self) {}
+ }
+ impl FooRef for &'_ () {
+ fn foo_ref(&self) {}
+ }
+ (&&()).foo_ref(); // Don't lint. `&()` will call `<() as FooRef>::foo_ref`
+
+ struct S;
+ impl From<S> for u32 {
+ fn from(s: S) -> Self {
+ (&s).into()
+ }
+ }
+ impl From<&S> for u32 {
+ fn from(s: &S) -> Self {
+ 0
+ }
+ }
+
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ let _ = std::path::Path::new(".").join(&&".");
+ deref_target_is_x(&X);
+ multiple_constraints(&[[""]]);
+ multiple_constraints_normalizes_to_same(&X, X);
+ let _ = Some("").unwrap_or(&"");
+ let _ = std::fs::write("x", &"".to_string());
+
+ only_sized(&""); // Don't lint. `Sized` is only bound
+ let _ = std::any::Any::type_id(&""); // Don't lint. `Any` is only bound
+ let _ = Box::new(&""); // Don't lint. Type parameter appears in return type
+ ref_as_ref_path(&""); // Don't lint. Argument type is not a type parameter
+ refs_only(&()); // Don't lint. `&T` implements trait, but `T` doesn't
+ multiple_constraints_normalizes_to_different(&[[""]], &[""]); // Don't lint. Projected type appears in arguments
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
+
+mod issue9160 {
+ pub struct S<F> {
+ f: F,
+ }
+
+ impl<T, F> S<F>
+ where
+ F: Fn() -> T,
+ {
+ fn calls_field(&self) -> T {
+ (&self.f)()
+ }
+ }
+
+ impl<T, F> S<F>
+ where
+ F: FnMut() -> T,
+ {
+ fn calls_mut_field(&mut self) -> T {
+ (&mut self.f)()
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+struct X;
+
+impl std::ops::Deref for X {
+ type Target = X;
+ fn deref(&self) -> &Self::Target {
+ self
+ }
+}
+
+fn deref_target_is_x<T>(_: T)
+where
+ T: std::ops::Deref<Target = X>,
+{
+}
+
+fn multiple_constraints<T, U, V, X, Y>(_: T)
+where
+ T: IntoIterator<Item = U> + IntoIterator<Item = X>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+ X: IntoIterator<Item = Y>,
+ Y: AsRef<std::ffi::OsStr>,
+{
+}
+
+fn multiple_constraints_normalizes_to_same<T, U, V>(_: T, _: V)
+where
+ T: std::ops::Deref<Target = U>,
+ U: std::ops::Deref<Target = V>,
+{
+}
+
+fn only_sized<T>(_: T) {}
+
+fn ref_as_ref_path<T: 'static>(_: &'static T)
+where
+ &'static T: AsRef<std::path::Path>,
+{
+}
+
+trait RefsOnly {
+ type Referent;
+}
+
+impl<T> RefsOnly for &T {
+ type Referent = T;
+}
+
+fn refs_only<T, U>(_: T)
+where
+ T: RefsOnly<Referent = U>,
+{
+}
+
+fn multiple_constraints_normalizes_to_different<T, U, V>(_: T, _: U)
+where
+ T: IntoIterator<Item = U>,
+ U: IntoIterator<Item = V>,
+ V: AsRef<str>,
+{
+}
+
+// https://github.com/rust-lang/rust-clippy/pull/9136#pullrequestreview-1037379321
+mod copyable_iterator {
+ #[derive(Clone, Copy)]
+ struct Iter;
+ impl Iterator for Iter {
+ type Item = ();
+ fn next(&mut self) -> Option<Self::Item> {
+ None
+ }
+ }
+ fn takes_iter(_: impl Iterator) {}
+ fn dont_warn(mut x: Iter) {
+ takes_iter(&mut x);
+ }
+ #[allow(unused_mut)]
+ fn warn(mut x: &mut Iter) {
+ takes_iter(&mut x)
+ }
+}
+
+#[clippy::msrv = "1.52.0"]
+mod under_msrv {
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+#[clippy::msrv = "1.53.0"]
+mod meets_msrv {
+ fn foo() {
+ let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ }
+}
+
+fn issue9383() {
+ // Should not lint because unions need explicit deref when accessing field
+ use std::mem::ManuallyDrop;
+
+ union Coral {
+ crab: ManuallyDrop<Vec<i32>>,
+ }
+
+ union Ocean {
+ coral: ManuallyDrop<Coral>,
+ }
+
+ let mut ocean = Ocean {
+ coral: ManuallyDrop::new(Coral {
+ crab: ManuallyDrop::new(vec![1, 2, 3]),
+ }),
+ };
+
+ unsafe {
+ ManuallyDrop::drop(&mut (&mut ocean.coral).crab);
+
+ (*ocean.coral).crab = ManuallyDrop::new(vec![4, 5, 6]);
+ ManuallyDrop::drop(&mut (*ocean.coral).crab);
+
+ ManuallyDrop::drop(&mut ocean.coral);
+ }
+}
+
+fn closure_test() {
+ let env = "env".to_owned();
+ let arg = "arg".to_owned();
+ let f = |arg| {
+ let loc = "loc".to_owned();
+ let _ = std::fs::write("x", &env); // Don't lint. In environment
+ let _ = std::fs::write("x", &arg);
+ let _ = std::fs::write("x", &loc);
+ };
+ let _ = std::fs::write("x", &env); // Don't lint. Borrowed by `f`
+ f(arg);
+}
+
+mod significant_drop {
+ #[derive(Debug)]
+ struct X;
+
+ #[derive(Debug)]
+ struct Y;
+
+ impl Drop for Y {
+ fn drop(&mut self) {}
+ }
+
+ fn foo(x: X, y: Y) {
+ debug(&x);
+ debug(&y); // Don't lint. Has significant drop
+ }
+
+ fn debug(_: impl std::fmt::Debug) {}
+}
+
+mod used_exactly_once {
+ fn foo(x: String) {
+ use_x(&x);
+ }
+ fn use_x(_: impl AsRef<str>) {}
+}
+
+mod used_more_than_once {
+ fn foo(x: String) {
+ use_x(&x);
+ use_x_again(&x);
+ }
+ fn use_x(_: impl AsRef<str>) {}
+ fn use_x_again(_: impl AsRef<str>) {}
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/9111#issuecomment-1277114280
+mod issue_9111 {
+ struct A;
+
+ impl Extend<u8> for A {
+ fn extend<T: IntoIterator<Item = u8>>(&mut self, _: T) {
+ unimplemented!()
+ }
+ }
+
+ impl<'a> Extend<&'a u8> for A {
+ fn extend<T: IntoIterator<Item = &'a u8>>(&mut self, _: T) {
+ unimplemented!()
+ }
+ }
+
+ fn main() {
+ let mut a = A;
+ a.extend(&[]); // vs a.extend([]);
+ }
+}
+
+mod issue_9710 {
+ fn main() {
+ let string = String::new();
+ for _i in 0..10 {
+ f(&string);
+ }
+ }
+
+ fn f<T: AsRef<str>>(_: T) {}
+}
+
+mod issue_9739 {
+ fn foo<D: std::fmt::Display>(_it: impl IntoIterator<Item = D>) {}
+
+ fn main() {
+ foo(if std::env::var_os("HI").is_some() {
+ &[0]
+ } else {
+ &[] as &[u32]
+ });
+ }
+}
+
+mod issue_9739_method_variant {
+ struct S;
+
+ impl S {
+ fn foo<D: std::fmt::Display>(&self, _it: impl IntoIterator<Item = D>) {}
+ }
+
+ fn main() {
+ S.foo(if std::env::var_os("HI").is_some() {
+ &[0]
+ } else {
+ &[] as &[u32]
+ });
+ }
+}
+
+mod issue_9782 {
+ fn foo<T: AsRef<[u8]>>(t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ // 100
+ foo::<[u8; 100]>(a);
+ foo(a);
+
+ // 16
+ foo::<&[u8]>(&a);
+ foo(a.as_slice());
+
+ // 8
+ foo::<&[u8; 100]>(&a);
+ foo(&a);
+ }
+}
+
+mod issue_9782_type_relative_variant {
+ struct S;
+
+ impl S {
+ fn foo<T: AsRef<[u8]>>(t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ S::foo::<&[u8; 100]>(&a);
+ }
+}
+
+mod issue_9782_method_variant {
+ struct S;
+
+ impl S {
+ fn foo<T: AsRef<[u8]>>(&self, t: T) {
+ println!("{}", std::mem::size_of::<T>());
+ let _t: &[u8] = t.as_ref();
+ }
+ }
+
+ fn main() {
+ let a: [u8; 100] = [0u8; 100];
+
+ S.foo::<&[u8; 100]>(&a);
+ }
+}
--- /dev/null
- error: the borrowed expression implements the required traits
- --> $DIR/needless_borrow.rs:502:85
- |
- LL | cx.struct_span_lint(lint, rustc_span::Span::default(), "", |diag| diag.note(&String::new()));
- | ^^^^^^^^^^^^^^ help: change this to: `String::new()`
-
- error: aborting due to 37 previous errors
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:15:15
+ |
+LL | let _ = x(&&a); // warn
+ | ^^^ help: change this to: `&a`
+ |
+ = note: `-D clippy::needless-borrow` implied by `-D warnings`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:19:13
+ |
+LL | mut_ref(&mut &mut b); // warn
+ | ^^^^^^^^^^^ help: change this to: `&mut b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:31:13
+ |
+LL | &&a
+ | ^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:33:15
+ |
+LL | 46 => &&a,
+ | ^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:39:27
+ |
+LL | break &ref_a;
+ | ^^^^^^ help: change this to: `ref_a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:46:15
+ |
+LL | let _ = x(&&&a);
+ | ^^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:47:15
+ |
+LL | let _ = x(&mut &&a);
+ | ^^^^^^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:48:15
+ |
+LL | let _ = x(&&&mut b);
+ | ^^^^^^^^ help: change this to: `&mut b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:49:15
+ |
+LL | let _ = x(&&ref_a);
+ | ^^^^^^^ help: change this to: `ref_a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:52:11
+ |
+LL | x(&b);
+ | ^^ help: change this to: `b`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:59:13
+ |
+LL | mut_ref(&mut x);
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:60:13
+ |
+LL | mut_ref(&mut &mut x);
+ | ^^^^^^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:61:23
+ |
+LL | let y: &mut i32 = &mut x;
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:62:23
+ |
+LL | let y: &mut i32 = &mut &mut x;
+ | ^^^^^^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:71:14
+ |
+LL | 0 => &mut x,
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:77:14
+ |
+LL | 0 => &mut x,
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:89:13
+ |
+LL | let _ = (&x).0;
+ | ^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:91:22
+ |
+LL | let _ = unsafe { (&*x).0 };
+ | ^^^^^ help: change this to: `(*x)`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:101:5
+ |
+LL | (&&()).foo();
+ | ^^^^^^ help: change this to: `(&())`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:110:5
+ |
+LL | (&&5).foo();
+ | ^^^^^ help: change this to: `(&5)`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:135:51
+ |
+LL | let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ | ^^^^^^^^^^^^^ help: change this to: `["-a", "-l"]`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:136:44
+ |
+LL | let _ = std::path::Path::new(".").join(&&".");
+ | ^^^^^ help: change this to: `"."`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:137:23
+ |
+LL | deref_target_is_x(&X);
+ | ^^ help: change this to: `X`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:138:26
+ |
+LL | multiple_constraints(&[[""]]);
+ | ^^^^^^^ help: change this to: `[[""]]`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:139:45
+ |
+LL | multiple_constraints_normalizes_to_same(&X, X);
+ | ^^ help: change this to: `X`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:140:32
+ |
+LL | let _ = Some("").unwrap_or(&"");
+ | ^^^ help: change this to: `""`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:141:33
+ |
+LL | let _ = std::fs::write("x", &"".to_string());
+ | ^^^^^^^^^^^^^^^ help: change this to: `"".to_string()`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:190:13
+ |
+LL | (&self.f)()
+ | ^^^^^^^^^ help: change this to: `(self.f)`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:199:13
+ |
+LL | (&mut self.f)()
+ | ^^^^^^^^^^^^^ help: change this to: `(self.f)`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:283:20
+ |
+LL | takes_iter(&mut x)
+ | ^^^^^^ help: change this to: `x`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:297:55
+ |
+LL | let _ = std::process::Command::new("ls").args(&["-a", "-l"]).status().unwrap();
+ | ^^^^^^^^^^^^^ help: change this to: `["-a", "-l"]`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:335:37
+ |
+LL | let _ = std::fs::write("x", &arg);
+ | ^^^^ help: change this to: `arg`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:336:37
+ |
+LL | let _ = std::fs::write("x", &loc);
+ | ^^^^ help: change this to: `loc`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:354:15
+ |
+LL | debug(&x);
+ | ^^ help: change this to: `x`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:363:15
+ |
+LL | use_x(&x);
+ | ^^ help: change this to: `x`
+
+error: the borrowed expression implements the required traits
+ --> $DIR/needless_borrow.rs:457:13
+ |
+LL | foo(&a);
+ | ^^ help: change this to: `a`
+
++error: aborting due to 36 previous errors
+
--- /dev/null
+// run-rustfix
+
+#![feature(lint_reasons)]
+#![feature(yeet_expr)]
+#![allow(unused)]
+#![allow(
+ clippy::if_same_then_else,
+ clippy::single_match,
+ clippy::needless_bool,
+ clippy::equatable_if_let
+)]
+#![warn(clippy::needless_return)]
+
+use std::cell::RefCell;
+
+macro_rules! the_answer {
+ () => {
+ 42
+ };
+}
+
+fn test_end_of_fn() -> bool {
+ if true {
+ // no error!
+ return true;
+ }
+ true
+}
+
+fn test_no_semicolon() -> bool {
+ true
+}
+
+fn test_if_block() -> bool {
+ if true {
+ true
+ } else {
+ false
+ }
+}
+
+fn test_match(x: bool) -> bool {
+ match x {
+ true => false,
+ false => {
+ true
+ },
+ }
+}
+
+fn test_closure() {
+ let _ = || {
+ true
+ };
+ let _ = || true;
+}
+
+fn test_macro_call() -> i32 {
+ the_answer!()
+}
+
+fn test_void_fun() {
+}
+
+fn test_void_if_fun(b: bool) {
+ if b {
+ } else {
+ }
+}
+
+fn test_void_match(x: u32) {
+ match x {
+ 0 => (),
+ _ => (),
+ }
+}
+
+fn test_nested_match(x: u32) {
+ match x {
+ 0 => (),
+ 1 => {
+ let _ = 42;
+ },
+ _ => (),
+ }
+}
+
+fn temporary_outlives_local() -> String {
+ let x = RefCell::<String>::default();
+ return x.borrow().clone();
+}
+
+fn borrows_but_not_last(value: bool) -> String {
+ if value {
+ let x = RefCell::<String>::default();
+ let _a = x.borrow().clone();
+ String::from("test")
+ } else {
+ String::new()
+ }
+}
+
+macro_rules! needed_return {
+ ($e:expr) => {
+ if $e > 3 {
+ return;
+ }
+ };
+}
+
+fn test_return_in_macro() {
+ // This will return and the macro below won't be executed. Removing the `return` from the macro
+ // will change semantics.
+ needed_return!(10);
+ needed_return!(0);
+}
+
+mod issue6501 {
+ #[allow(clippy::unnecessary_lazy_evaluations)]
+ fn foo(bar: Result<(), ()>) {
+ bar.unwrap_or_else(|_| {})
+ }
+
+ fn test_closure() {
+ let _ = || {
+ };
+ let _ = || {};
+ }
+
+ struct Foo;
+ #[allow(clippy::unnecessary_lazy_evaluations)]
+ fn bar(res: Result<Foo, u8>) -> Foo {
+ res.unwrap_or_else(|_| Foo)
+ }
+}
+
+async fn async_test_end_of_fn() -> bool {
+ if true {
+ // no error!
+ return true;
+ }
+ true
+}
+
+async fn async_test_no_semicolon() -> bool {
+ true
+}
+
+async fn async_test_if_block() -> bool {
+ if true {
+ true
+ } else {
+ false
+ }
+}
+
+async fn async_test_match(x: bool) -> bool {
+ match x {
+ true => false,
+ false => {
+ true
+ },
+ }
+}
+
+async fn async_test_closure() {
+ let _ = || {
+ true
+ };
+ let _ = || true;
+}
+
+async fn async_test_macro_call() -> i32 {
+ the_answer!()
+}
+
+async fn async_test_void_fun() {
+}
+
+async fn async_test_void_if_fun(b: bool) {
+ if b {
+ } else {
+ }
+}
+
+async fn async_test_void_match(x: u32) {
+ match x {
+ 0 => (),
+ _ => (),
+ }
+}
+
+async fn async_temporary_outlives_local() -> String {
+ let x = RefCell::<String>::default();
+ return x.borrow().clone();
+}
+
+async fn async_borrows_but_not_last(value: bool) -> String {
+ if value {
+ let x = RefCell::<String>::default();
+ let _a = x.borrow().clone();
+ String::from("test")
+ } else {
+ String::new()
+ }
+}
+
+async fn async_test_return_in_macro() {
+ needed_return!(10);
+ needed_return!(0);
+}
+
+fn let_else() {
+ let Some(1) = Some(1) else { return };
+}
+
+fn needless_return_macro() -> String {
+ let _ = "foo";
+ let _ = "bar";
+ format!("Hello {}", "world!")
+}
+
+fn issue_9361() -> i32 {
+ #[allow(clippy::integer_arithmetic)]
+ return 1 + 2;
+}
+
+fn issue8336(x: i32) -> bool {
+ if x > 0 {
+ println!("something");
+ true
+ } else {
+ false
+ }
+}
+
+fn issue8156(x: u8) -> u64 {
+ match x {
+ 80 => {
+ 10
+ },
+ _ => {
+ 100
+ },
+ }
+}
+
+// Ideally the compiler should throw `unused_braces` in this case
+fn issue9192() -> i32 {
+ {
+ 0
+ }
+}
+
+fn issue9503(x: usize) -> isize {
+ unsafe {
+ if x > 12 {
+ *(x as *const isize)
+ } else {
+ !*(x as *const isize)
+ }
+ }
+}
+
+mod issue9416 {
+ pub fn with_newline() {
+ let _ = 42;
+ }
+
+ #[rustfmt::skip]
+ pub fn oneline() {
+ let _ = 42;
+ }
+}
+
+fn issue9947() -> Result<(), String> {
+ do yeet "hello";
+}
+
++// without anyhow, but triggers the same bug I believe
++#[expect(clippy::useless_format)]
++fn issue10051() -> Result<String, String> {
++ if true {
++ Ok(format!("ok!"))
++ } else {
++ Err(format!("err!"))
++ }
++}
++
+fn main() {}
--- /dev/null
+// run-rustfix
+
+#![feature(lint_reasons)]
+#![feature(yeet_expr)]
+#![allow(unused)]
+#![allow(
+ clippy::if_same_then_else,
+ clippy::single_match,
+ clippy::needless_bool,
+ clippy::equatable_if_let
+)]
+#![warn(clippy::needless_return)]
+
+use std::cell::RefCell;
+
+macro_rules! the_answer {
+ () => {
+ 42
+ };
+}
+
+fn test_end_of_fn() -> bool {
+ if true {
+ // no error!
+ return true;
+ }
+ return true;
+}
+
+fn test_no_semicolon() -> bool {
+ return true;
+}
+
+fn test_if_block() -> bool {
+ if true {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+fn test_match(x: bool) -> bool {
+ match x {
+ true => return false,
+ false => {
+ return true;
+ },
+ }
+}
+
+fn test_closure() {
+ let _ = || {
+ return true;
+ };
+ let _ = || return true;
+}
+
+fn test_macro_call() -> i32 {
+ return the_answer!();
+}
+
+fn test_void_fun() {
+ return;
+}
+
+fn test_void_if_fun(b: bool) {
+ if b {
+ return;
+ } else {
+ return;
+ }
+}
+
+fn test_void_match(x: u32) {
+ match x {
+ 0 => (),
+ _ => return,
+ }
+}
+
+fn test_nested_match(x: u32) {
+ match x {
+ 0 => (),
+ 1 => {
+ let _ = 42;
+ return;
+ },
+ _ => return,
+ }
+}
+
+fn temporary_outlives_local() -> String {
+ let x = RefCell::<String>::default();
+ return x.borrow().clone();
+}
+
+fn borrows_but_not_last(value: bool) -> String {
+ if value {
+ let x = RefCell::<String>::default();
+ let _a = x.borrow().clone();
+ return String::from("test");
+ } else {
+ return String::new();
+ }
+}
+
+macro_rules! needed_return {
+ ($e:expr) => {
+ if $e > 3 {
+ return;
+ }
+ };
+}
+
+fn test_return_in_macro() {
+ // This will return and the macro below won't be executed. Removing the `return` from the macro
+ // will change semantics.
+ needed_return!(10);
+ needed_return!(0);
+}
+
+mod issue6501 {
+ #[allow(clippy::unnecessary_lazy_evaluations)]
+ fn foo(bar: Result<(), ()>) {
+ bar.unwrap_or_else(|_| return)
+ }
+
+ fn test_closure() {
+ let _ = || {
+ return;
+ };
+ let _ = || return;
+ }
+
+ struct Foo;
+ #[allow(clippy::unnecessary_lazy_evaluations)]
+ fn bar(res: Result<Foo, u8>) -> Foo {
+ res.unwrap_or_else(|_| return Foo)
+ }
+}
+
+async fn async_test_end_of_fn() -> bool {
+ if true {
+ // no error!
+ return true;
+ }
+ return true;
+}
+
+async fn async_test_no_semicolon() -> bool {
+ return true;
+}
+
+async fn async_test_if_block() -> bool {
+ if true {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+async fn async_test_match(x: bool) -> bool {
+ match x {
+ true => return false,
+ false => {
+ return true;
+ },
+ }
+}
+
+async fn async_test_closure() {
+ let _ = || {
+ return true;
+ };
+ let _ = || return true;
+}
+
+async fn async_test_macro_call() -> i32 {
+ return the_answer!();
+}
+
+async fn async_test_void_fun() {
+ return;
+}
+
+async fn async_test_void_if_fun(b: bool) {
+ if b {
+ return;
+ } else {
+ return;
+ }
+}
+
+async fn async_test_void_match(x: u32) {
+ match x {
+ 0 => (),
+ _ => return,
+ }
+}
+
+async fn async_temporary_outlives_local() -> String {
+ let x = RefCell::<String>::default();
+ return x.borrow().clone();
+}
+
+async fn async_borrows_but_not_last(value: bool) -> String {
+ if value {
+ let x = RefCell::<String>::default();
+ let _a = x.borrow().clone();
+ return String::from("test");
+ } else {
+ return String::new();
+ }
+}
+
+async fn async_test_return_in_macro() {
+ needed_return!(10);
+ needed_return!(0);
+}
+
+fn let_else() {
+ let Some(1) = Some(1) else { return };
+}
+
+fn needless_return_macro() -> String {
+ let _ = "foo";
+ let _ = "bar";
+ return format!("Hello {}", "world!");
+}
+
+fn issue_9361() -> i32 {
+ #[allow(clippy::integer_arithmetic)]
+ return 1 + 2;
+}
+
+fn issue8336(x: i32) -> bool {
+ if x > 0 {
+ println!("something");
+ return true;
+ } else {
+ return false;
+ };
+}
+
+fn issue8156(x: u8) -> u64 {
+ match x {
+ 80 => {
+ return 10;
+ },
+ _ => {
+ return 100;
+ },
+ };
+}
+
+// Ideally the compiler should throw `unused_braces` in this case
+fn issue9192() -> i32 {
+ {
+ return 0;
+ };
+}
+
+fn issue9503(x: usize) -> isize {
+ unsafe {
+ if x > 12 {
+ return *(x as *const isize);
+ } else {
+ return !*(x as *const isize);
+ };
+ };
+}
+
+mod issue9416 {
+ pub fn with_newline() {
+ let _ = 42;
+
+ return;
+ }
+
+ #[rustfmt::skip]
+ pub fn oneline() {
+ let _ = 42; return;
+ }
+}
+
+fn issue9947() -> Result<(), String> {
+ do yeet "hello";
+}
+
++// without anyhow, but triggers the same bug I believe
++#[expect(clippy::useless_format)]
++fn issue10051() -> Result<String, String> {
++ if true {
++ return Ok(format!("ok!"));
++ } else {
++ return Err(format!("err!"));
++ }
++}
++
+fn main() {}
--- /dev/null
- error: aborting due to 46 previous errors
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:27:5
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = note: `-D clippy::needless-return` implied by `-D warnings`
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:31:5
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:36:9
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:38:9
+ |
+LL | return false;
+ | ^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:44:17
+ |
+LL | true => return false,
+ | ^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:46:13
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:53:9
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:55:16
+ |
+LL | let _ = || return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:59:5
+ |
+LL | return the_answer!();
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:62:21
+ |
+LL | fn test_void_fun() {
+ | _____________________^
+LL | | return;
+ | |__________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:67:11
+ |
+LL | if b {
+ | ___________^
+LL | | return;
+ | |______________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:69:13
+ |
+LL | } else {
+ | _____________^
+LL | | return;
+ | |______________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:77:14
+ |
+LL | _ => return,
+ | ^^^^^^
+ |
+ = help: replace `return` with a unit value
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:85:24
+ |
+LL | let _ = 42;
+ | ________________________^
+LL | | return;
+ | |__________________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:88:14
+ |
+LL | _ => return,
+ | ^^^^^^
+ |
+ = help: replace `return` with a unit value
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:101:9
+ |
+LL | return String::from("test");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:103:9
+ |
+LL | return String::new();
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:125:32
+ |
+LL | bar.unwrap_or_else(|_| return)
+ | ^^^^^^
+ |
+ = help: replace `return` with an empty block
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:129:21
+ |
+LL | let _ = || {
+ | _____________________^
+LL | | return;
+ | |__________________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:132:20
+ |
+LL | let _ = || return;
+ | ^^^^^^
+ |
+ = help: replace `return` with an empty block
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:138:32
+ |
+LL | res.unwrap_or_else(|_| return Foo)
+ | ^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:147:5
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:151:5
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:156:9
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:158:9
+ |
+LL | return false;
+ | ^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:164:17
+ |
+LL | true => return false,
+ | ^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:166:13
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:173:9
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:175:16
+ |
+LL | let _ = || return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:179:5
+ |
+LL | return the_answer!();
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:182:33
+ |
+LL | async fn async_test_void_fun() {
+ | _________________________________^
+LL | | return;
+ | |__________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:187:11
+ |
+LL | if b {
+ | ___________^
+LL | | return;
+ | |______________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:189:13
+ |
+LL | } else {
+ | _____________^
+LL | | return;
+ | |______________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:197:14
+ |
+LL | _ => return,
+ | ^^^^^^
+ |
+ = help: replace `return` with a unit value
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:210:9
+ |
+LL | return String::from("test");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:212:9
+ |
+LL | return String::new();
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:228:5
+ |
+LL | return format!("Hello {}", "world!");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:239:9
+ |
+LL | return true;
+ | ^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:241:9
+ |
+LL | return false;
+ | ^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:248:13
+ |
+LL | return 10;
+ | ^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:251:13
+ |
+LL | return 100;
+ | ^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:259:9
+ |
+LL | return 0;
+ | ^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:266:13
+ |
+LL | return *(x as *const isize);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:268:13
+ |
+LL | return !*(x as *const isize);
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:275:20
+ |
+LL | let _ = 42;
+ | ____________________^
+LL | |
+LL | | return;
+ | |______________^
+ |
+ = help: remove `return`
+
+error: unneeded `return` statement
+ --> $DIR/needless_return.rs:282:20
+ |
+LL | let _ = 42; return;
+ | ^^^^^^^
+ |
+ = help: remove `return`
+
++error: unneeded `return` statement
++ --> $DIR/needless_return.rs:294:9
++ |
++LL | return Ok(format!("ok!"));
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: remove `return`
++
++error: unneeded `return` statement
++ --> $DIR/needless_return.rs:296:9
++ |
++LL | return Err(format!("err!"));
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: remove `return`
++
++error: aborting due to 48 previous errors
+
--- /dev/null
-
- #[allow(unused, clippy::manual_retain)]
- fn possible_borrower_improvements() {
- let mut s = String::from("foobar");
- s = s.chars().filter(|&c| c != 'o').collect();
- }
+// run-rustfix
+// rustfix-only-machine-applicable
+#![feature(lint_reasons)]
+#![allow(clippy::drop_non_drop, clippy::implicit_clone, clippy::uninlined_format_args)]
+
+use std::ffi::OsString;
+use std::path::Path;
+
+fn main() {
+ let _s = ["lorem", "ipsum"].join(" ");
+
+ let s = String::from("foo");
+ let _s = s;
+
+ let s = String::from("foo");
+ let _s = s;
+
+ let s = String::from("foo");
+ let _s = s;
+
+ let _s = Path::new("/a/b/").join("c");
+
+ let _s = Path::new("/a/b/").join("c");
+
+ let _s = OsString::new();
+
+ let _s = OsString::new();
+
+ // Check that lint level works
+ #[allow(clippy::redundant_clone)]
+ let _s = String::new().to_string();
+
+ // Check that lint level works
+ #[expect(clippy::redundant_clone)]
+ let _s = String::new().to_string();
+
+ let tup = (String::from("foo"),);
+ let _t = tup.0;
+
+ let tup_ref = &(String::from("foo"),);
+ let _s = tup_ref.0.clone(); // this `.clone()` cannot be removed
+
+ {
+ let x = String::new();
+ let y = &x;
+
+ let _x = x.clone(); // ok; `x` is borrowed by `y`
+
+ let _ = y.len();
+ }
+
+ let x = (String::new(),);
+ let _ = Some(String::new()).unwrap_or_else(|| x.0.clone()); // ok; closure borrows `x`
+
+ with_branch(Alpha, true);
+ cannot_double_move(Alpha);
+ cannot_move_from_type_with_drop();
+ borrower_propagation();
+ not_consumed();
+ issue_5405();
+ manually_drop();
+ clone_then_move_cloned();
+ hashmap_neg();
+ false_negative_5707();
+}
+
+#[derive(Clone)]
+struct Alpha;
+fn with_branch(a: Alpha, b: bool) -> (Alpha, Alpha) {
+ if b { (a.clone(), a) } else { (Alpha, a) }
+}
+
+fn cannot_double_move(a: Alpha) -> (Alpha, Alpha) {
+ (a.clone(), a)
+}
+
+struct TypeWithDrop {
+ x: String,
+}
+
+impl Drop for TypeWithDrop {
+ fn drop(&mut self) {}
+}
+
+fn cannot_move_from_type_with_drop() -> String {
+ let s = TypeWithDrop { x: String::new() };
+ s.x.clone() // removing this `clone()` summons E0509
+}
+
+fn borrower_propagation() {
+ let s = String::new();
+ let t = String::new();
+
+ {
+ fn b() -> bool {
+ unimplemented!()
+ }
+ let _u = if b() { &s } else { &t };
+
+ // ok; `s` and `t` are possibly borrowed
+ let _s = s.clone();
+ let _t = t.clone();
+ }
+
+ {
+ let _u = || s.len();
+ let _v = [&t; 32];
+ let _s = s.clone(); // ok
+ let _t = t.clone(); // ok
+ }
+
+ {
+ let _u = {
+ let u = Some(&s);
+ let _ = s.clone(); // ok
+ u
+ };
+ let _s = s.clone(); // ok
+ }
+
+ {
+ use std::convert::identity as id;
+ let _u = id(id(&s));
+ let _s = s.clone(); // ok, `u` borrows `s`
+ }
+
+ let _s = s;
+ let _t = t;
+
+ #[derive(Clone)]
+ struct Foo {
+ x: usize,
+ }
+
+ {
+ let f = Foo { x: 123 };
+ let _x = Some(f.x);
+ let _f = f;
+ }
+
+ {
+ let f = Foo { x: 123 };
+ let _x = &f.x;
+ let _f = f.clone(); // ok
+ }
+}
+
+fn not_consumed() {
+ let x = std::path::PathBuf::from("home");
+ let y = x.join("matthias");
+ // join() creates a new owned PathBuf, does not take a &mut to x variable, thus the .clone() is
+ // redundant. (It also does not consume the PathBuf)
+
+ println!("x: {:?}, y: {:?}", x, y);
+
+ let mut s = String::new();
+ s.clone().push_str("foo"); // OK, removing this `clone()` will change the behavior.
+ s.push_str("bar");
+ assert_eq!(s, "bar");
+
+ let t = Some(s);
+ // OK
+ if let Some(x) = t.clone() {
+ println!("{}", x);
+ }
+ if let Some(x) = t {
+ println!("{}", x);
+ }
+}
+
+#[allow(clippy::clone_on_copy)]
+fn issue_5405() {
+ let a: [String; 1] = [String::from("foo")];
+ let _b: String = a[0].clone();
+
+ let c: [usize; 2] = [2, 3];
+ let _d: usize = c[1].clone();
+}
+
+fn manually_drop() {
+ use std::mem::ManuallyDrop;
+ use std::sync::Arc;
+
+ let a = ManuallyDrop::new(Arc::new("Hello!".to_owned()));
+ let _ = a.clone(); // OK
+
+ let p: *const String = Arc::into_raw(ManuallyDrop::into_inner(a));
+ unsafe {
+ Arc::from_raw(p);
+ Arc::from_raw(p);
+ }
+}
+
+fn clone_then_move_cloned() {
+ // issue #5973
+ let x = Some(String::new());
+ // ok, x is moved while the clone is in use.
+ assert_eq!(x.clone(), None, "not equal {}", x.unwrap());
+
+ // issue #5595
+ fn foo<F: Fn()>(_: &Alpha, _: F) {}
+ let x = Alpha;
+ // ok, data is moved while the clone is in use.
+ foo(&x, move || {
+ let _ = x;
+ });
+
+ // issue #6998
+ struct S(String);
+ impl S {
+ fn m(&mut self) {}
+ }
+ let mut x = S(String::new());
+ x.0.clone().chars().for_each(|_| x.m());
+}
+
+fn hashmap_neg() {
+ // issue 5707
+ use std::collections::HashMap;
+ use std::path::PathBuf;
+
+ let p = PathBuf::from("/");
+
+ let mut h: HashMap<&str, &str> = HashMap::new();
+ h.insert("orig-p", p.to_str().unwrap());
+
+ let mut q = p.clone();
+ q.push("foo");
+
+ println!("{:?} {}", h, q.display());
+}
+
+fn false_negative_5707() {
+ fn foo(_x: &Alpha, _y: &mut Alpha) {}
+
+ let x = Alpha;
+ let mut y = Alpha;
+ foo(&x, &mut y);
+ let _z = x.clone(); // pr 7346 can't lint on `x`
+ drop(y);
+}
--- /dev/null
-
- #[allow(unused, clippy::manual_retain)]
- fn possible_borrower_improvements() {
- let mut s = String::from("foobar");
- s = s.chars().filter(|&c| c != 'o').to_owned().collect();
- }
+// run-rustfix
+// rustfix-only-machine-applicable
+#![feature(lint_reasons)]
+#![allow(clippy::drop_non_drop, clippy::implicit_clone, clippy::uninlined_format_args)]
+
+use std::ffi::OsString;
+use std::path::Path;
+
+fn main() {
+ let _s = ["lorem", "ipsum"].join(" ").to_string();
+
+ let s = String::from("foo");
+ let _s = s.clone();
+
+ let s = String::from("foo");
+ let _s = s.to_string();
+
+ let s = String::from("foo");
+ let _s = s.to_owned();
+
+ let _s = Path::new("/a/b/").join("c").to_owned();
+
+ let _s = Path::new("/a/b/").join("c").to_path_buf();
+
+ let _s = OsString::new().to_owned();
+
+ let _s = OsString::new().to_os_string();
+
+ // Check that lint level works
+ #[allow(clippy::redundant_clone)]
+ let _s = String::new().to_string();
+
+ // Check that lint level works
+ #[expect(clippy::redundant_clone)]
+ let _s = String::new().to_string();
+
+ let tup = (String::from("foo"),);
+ let _t = tup.0.clone();
+
+ let tup_ref = &(String::from("foo"),);
+ let _s = tup_ref.0.clone(); // this `.clone()` cannot be removed
+
+ {
+ let x = String::new();
+ let y = &x;
+
+ let _x = x.clone(); // ok; `x` is borrowed by `y`
+
+ let _ = y.len();
+ }
+
+ let x = (String::new(),);
+ let _ = Some(String::new()).unwrap_or_else(|| x.0.clone()); // ok; closure borrows `x`
+
+ with_branch(Alpha, true);
+ cannot_double_move(Alpha);
+ cannot_move_from_type_with_drop();
+ borrower_propagation();
+ not_consumed();
+ issue_5405();
+ manually_drop();
+ clone_then_move_cloned();
+ hashmap_neg();
+ false_negative_5707();
+}
+
+#[derive(Clone)]
+struct Alpha;
+fn with_branch(a: Alpha, b: bool) -> (Alpha, Alpha) {
+ if b { (a.clone(), a.clone()) } else { (Alpha, a) }
+}
+
+fn cannot_double_move(a: Alpha) -> (Alpha, Alpha) {
+ (a.clone(), a)
+}
+
+struct TypeWithDrop {
+ x: String,
+}
+
+impl Drop for TypeWithDrop {
+ fn drop(&mut self) {}
+}
+
+fn cannot_move_from_type_with_drop() -> String {
+ let s = TypeWithDrop { x: String::new() };
+ s.x.clone() // removing this `clone()` summons E0509
+}
+
+fn borrower_propagation() {
+ let s = String::new();
+ let t = String::new();
+
+ {
+ fn b() -> bool {
+ unimplemented!()
+ }
+ let _u = if b() { &s } else { &t };
+
+ // ok; `s` and `t` are possibly borrowed
+ let _s = s.clone();
+ let _t = t.clone();
+ }
+
+ {
+ let _u = || s.len();
+ let _v = [&t; 32];
+ let _s = s.clone(); // ok
+ let _t = t.clone(); // ok
+ }
+
+ {
+ let _u = {
+ let u = Some(&s);
+ let _ = s.clone(); // ok
+ u
+ };
+ let _s = s.clone(); // ok
+ }
+
+ {
+ use std::convert::identity as id;
+ let _u = id(id(&s));
+ let _s = s.clone(); // ok, `u` borrows `s`
+ }
+
+ let _s = s.clone();
+ let _t = t.clone();
+
+ #[derive(Clone)]
+ struct Foo {
+ x: usize,
+ }
+
+ {
+ let f = Foo { x: 123 };
+ let _x = Some(f.x);
+ let _f = f.clone();
+ }
+
+ {
+ let f = Foo { x: 123 };
+ let _x = &f.x;
+ let _f = f.clone(); // ok
+ }
+}
+
+fn not_consumed() {
+ let x = std::path::PathBuf::from("home");
+ let y = x.clone().join("matthias");
+ // join() creates a new owned PathBuf, does not take a &mut to x variable, thus the .clone() is
+ // redundant. (It also does not consume the PathBuf)
+
+ println!("x: {:?}, y: {:?}", x, y);
+
+ let mut s = String::new();
+ s.clone().push_str("foo"); // OK, removing this `clone()` will change the behavior.
+ s.push_str("bar");
+ assert_eq!(s, "bar");
+
+ let t = Some(s);
+ // OK
+ if let Some(x) = t.clone() {
+ println!("{}", x);
+ }
+ if let Some(x) = t {
+ println!("{}", x);
+ }
+}
+
+#[allow(clippy::clone_on_copy)]
+fn issue_5405() {
+ let a: [String; 1] = [String::from("foo")];
+ let _b: String = a[0].clone();
+
+ let c: [usize; 2] = [2, 3];
+ let _d: usize = c[1].clone();
+}
+
+fn manually_drop() {
+ use std::mem::ManuallyDrop;
+ use std::sync::Arc;
+
+ let a = ManuallyDrop::new(Arc::new("Hello!".to_owned()));
+ let _ = a.clone(); // OK
+
+ let p: *const String = Arc::into_raw(ManuallyDrop::into_inner(a));
+ unsafe {
+ Arc::from_raw(p);
+ Arc::from_raw(p);
+ }
+}
+
+fn clone_then_move_cloned() {
+ // issue #5973
+ let x = Some(String::new());
+ // ok, x is moved while the clone is in use.
+ assert_eq!(x.clone(), None, "not equal {}", x.unwrap());
+
+ // issue #5595
+ fn foo<F: Fn()>(_: &Alpha, _: F) {}
+ let x = Alpha;
+ // ok, data is moved while the clone is in use.
+ foo(&x.clone(), move || {
+ let _ = x;
+ });
+
+ // issue #6998
+ struct S(String);
+ impl S {
+ fn m(&mut self) {}
+ }
+ let mut x = S(String::new());
+ x.0.clone().chars().for_each(|_| x.m());
+}
+
+fn hashmap_neg() {
+ // issue 5707
+ use std::collections::HashMap;
+ use std::path::PathBuf;
+
+ let p = PathBuf::from("/");
+
+ let mut h: HashMap<&str, &str> = HashMap::new();
+ h.insert("orig-p", p.to_str().unwrap());
+
+ let mut q = p.clone();
+ q.push("foo");
+
+ println!("{:?} {}", h, q.display());
+}
+
+fn false_negative_5707() {
+ fn foo(_x: &Alpha, _y: &mut Alpha) {}
+
+ let x = Alpha;
+ let mut y = Alpha;
+ foo(&x, &mut y);
+ let _z = x.clone(); // pr 7346 can't lint on `x`
+ drop(y);
+}
--- /dev/null
- error: redundant clone
- --> $DIR/redundant_clone.rs:246:40
- |
- LL | s = s.chars().filter(|&c| c != 'o').to_owned().collect();
- | ^^^^^^^^^^^ help: remove this
- |
- note: this value is dropped without further use
- --> $DIR/redundant_clone.rs:246:9
- |
- LL | s = s.chars().filter(|&c| c != 'o').to_owned().collect();
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
- error: aborting due to 16 previous errors
+error: redundant clone
+ --> $DIR/redundant_clone.rs:10:42
+ |
+LL | let _s = ["lorem", "ipsum"].join(" ").to_string();
+ | ^^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:10:14
+ |
+LL | let _s = ["lorem", "ipsum"].join(" ").to_string();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ = note: `-D clippy::redundant-clone` implied by `-D warnings`
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:13:15
+ |
+LL | let _s = s.clone();
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:13:14
+ |
+LL | let _s = s.clone();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:16:15
+ |
+LL | let _s = s.to_string();
+ | ^^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:16:14
+ |
+LL | let _s = s.to_string();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:19:15
+ |
+LL | let _s = s.to_owned();
+ | ^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:19:14
+ |
+LL | let _s = s.to_owned();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:21:42
+ |
+LL | let _s = Path::new("/a/b/").join("c").to_owned();
+ | ^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:21:14
+ |
+LL | let _s = Path::new("/a/b/").join("c").to_owned();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:23:42
+ |
+LL | let _s = Path::new("/a/b/").join("c").to_path_buf();
+ | ^^^^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:23:14
+ |
+LL | let _s = Path::new("/a/b/").join("c").to_path_buf();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:25:29
+ |
+LL | let _s = OsString::new().to_owned();
+ | ^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:25:14
+ |
+LL | let _s = OsString::new().to_owned();
+ | ^^^^^^^^^^^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:27:29
+ |
+LL | let _s = OsString::new().to_os_string();
+ | ^^^^^^^^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:27:14
+ |
+LL | let _s = OsString::new().to_os_string();
+ | ^^^^^^^^^^^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:38:19
+ |
+LL | let _t = tup.0.clone();
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:38:14
+ |
+LL | let _t = tup.0.clone();
+ | ^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:70:25
+ |
+LL | if b { (a.clone(), a.clone()) } else { (Alpha, a) }
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:70:24
+ |
+LL | if b { (a.clone(), a.clone()) } else { (Alpha, a) }
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:127:15
+ |
+LL | let _s = s.clone();
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:127:14
+ |
+LL | let _s = s.clone();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:128:15
+ |
+LL | let _t = t.clone();
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:128:14
+ |
+LL | let _t = t.clone();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:138:19
+ |
+LL | let _f = f.clone();
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:138:18
+ |
+LL | let _f = f.clone();
+ | ^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:150:14
+ |
+LL | let y = x.clone().join("matthias");
+ | ^^^^^^^^ help: remove this
+ |
+note: cloned value is neither consumed nor mutated
+ --> $DIR/redundant_clone.rs:150:13
+ |
+LL | let y = x.clone().join("matthias");
+ | ^^^^^^^^^
+
+error: redundant clone
+ --> $DIR/redundant_clone.rs:204:11
+ |
+LL | foo(&x.clone(), move || {
+ | ^^^^^^^^ help: remove this
+ |
+note: this value is dropped without further use
+ --> $DIR/redundant_clone.rs:204:10
+ |
+LL | foo(&x.clone(), move || {
+ | ^
+
++error: aborting due to 15 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::derived_hash_with_manual_eq)]
+#![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::derived_hash_with_manual_eq)]
+#![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::derived_hash_with_manual_eq)]
+#![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::derive_hash_xor_eq)]
+#![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:41:9
+error: lint `clippy::almost_complete_letter_range` has been renamed to `clippy::almost_complete_range`
- --> $DIR/rename.rs:42:9
++ --> $DIR/rename.rs:42:9
+ |
+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`
- --> $DIR/rename.rs:43:9
++ --> $DIR/rename.rs:43:9
+ |
+LL | #![warn(clippy::blacklisted_name)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_names`
+
+error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_if_conditions`
- --> $DIR/rename.rs:44:9
++ --> $DIR/rename.rs:44:9
+ |
+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:45:9
++ --> $DIR/rename.rs:45:9
+ |
+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:46:9
++ --> $DIR/rename.rs:46:9
+ |
+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:47:9
++ --> $DIR/rename.rs:47:9
+ |
+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:48:9
++ --> $DIR/rename.rs:48:9
+ |
+LL | #![warn(clippy::cyclomatic_complexity)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
+
++error: lint `clippy::derive_hash_xor_eq` has been renamed to `clippy::derived_hash_with_manual_eq`
++ --> $DIR/rename.rs:49:9
++ |
++LL | #![warn(clippy::derive_hash_xor_eq)]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::derived_hash_with_manual_eq`
++
+error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
- --> $DIR/rename.rs:49:9
++ --> $DIR/rename.rs:50:9
+ |
+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:50:9
++ --> $DIR/rename.rs:51:9
+ |
+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:51:9
++ --> $DIR/rename.rs:52:9
+ |
+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:52:9
++ --> $DIR/rename.rs:53:9
+ |
+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:53:9
++ --> $DIR/rename.rs:54:9
+ |
+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:54:9
++ --> $DIR/rename.rs:55:9
+ |
+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:55:9
++ --> $DIR/rename.rs:56:9
+ |
+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:56:9
++ --> $DIR/rename.rs:57:9
+ |
+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:57:9
++ --> $DIR/rename.rs:58:9
+ |
+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:58:9
++ --> $DIR/rename.rs:59:9
+ |
+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:59:9
++ --> $DIR/rename.rs:60:9
+ |
+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:60:9
++ --> $DIR/rename.rs:61:9
+ |
+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:61:9
++ --> $DIR/rename.rs:62:9
+ |
+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:62:9
++ --> $DIR/rename.rs:63:9
+ |
+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:63:9
++ --> $DIR/rename.rs:64:9
+ |
+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:64:9
++ --> $DIR/rename.rs:65:9
+ |
+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:65:9
++ --> $DIR/rename.rs:66:9
+ |
+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:66:9
++ --> $DIR/rename.rs:67:9
+ |
+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:67:9
++ --> $DIR/rename.rs:68:9
+ |
+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:68:9
++ --> $DIR/rename.rs:69:9
+ |
+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:69:9
++ --> $DIR/rename.rs:70:9
+ |
+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:70:9
++ --> $DIR/rename.rs:71:9
+ |
+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:71:9
++ --> $DIR/rename.rs:72:9
+ |
+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:72:9
++ --> $DIR/rename.rs:73:9
+ |
+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:73:9
++ --> $DIR/rename.rs:74:9
+ |
+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:74:9
++ --> $DIR/rename.rs:75:9
+ |
+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:75:9
++ --> $DIR/rename.rs:76:9
+ |
+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:76:9
++ --> $DIR/rename.rs:77:9
+ |
+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:77:9
++ --> $DIR/rename.rs:78:9
+ |
+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:78:9
++ --> $DIR/rename.rs:79:9
+ |
+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:79:9
++ --> $DIR/rename.rs:80:9
+ |
+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:80:9
++ --> $DIR/rename.rs:81:9
+ |
+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:81:9
++ --> $DIR/rename.rs:82:9
+ |
+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 41 previous errors
++ --> $DIR/rename.rs:83:9
+ |
+LL | #![warn(clippy::unused_label)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
+
++error: aborting due to 42 previous errors
+
--- /dev/null
+// run-rustfix
+// Tests from for_loop.rs that don't have suggestions
+
+#[warn(clippy::single_element_loop)]
+fn main() {
+ let item1 = 2;
+ {
+ let item = &item1;
+ dbg!(item);
+ }
+
+ {
+ let item = &item1;
+ dbg!(item);
+ }
+
+ {
+ let item = &(0..5);
+ dbg!(item);
+ }
+
+ {
+ let item = &mut (0..5);
+ dbg!(item);
+ }
+
+ {
+ let item = 0..5;
+ dbg!(item);
+ }
+
+ {
+ let item = 0..5;
+ dbg!(item);
+ }
++
++ // should not lint (issue #10018)
++ for e in [42] {
++ if e > 0 {
++ continue;
++ }
++ }
++
++ // should not lint (issue #10018)
++ for e in [42] {
++ if e > 0 {
++ break;
++ }
++ }
++
++ // should lint (issue #10018)
++ {
++ let _ = 42;
++ let _f = |n: u32| {
++ for i in 0..n {
++ if i > 10 {
++ dbg!(i);
++ break;
++ }
++ }
++ };
++ }
+}
--- /dev/null
+// run-rustfix
+// Tests from for_loop.rs that don't have suggestions
+
+#[warn(clippy::single_element_loop)]
+fn main() {
+ let item1 = 2;
+ for item in &[item1] {
+ dbg!(item);
+ }
+
+ for item in [item1].iter() {
+ dbg!(item);
+ }
+
+ for item in &[0..5] {
+ dbg!(item);
+ }
+
+ for item in [0..5].iter_mut() {
+ dbg!(item);
+ }
+
+ for item in [0..5] {
+ dbg!(item);
+ }
+
+ for item in [0..5].into_iter() {
+ dbg!(item);
+ }
++
++ // should not lint (issue #10018)
++ for e in [42] {
++ if e > 0 {
++ continue;
++ }
++ }
++
++ // should not lint (issue #10018)
++ for e in [42] {
++ if e > 0 {
++ break;
++ }
++ }
++
++ // should lint (issue #10018)
++ for _ in [42] {
++ let _f = |n: u32| {
++ for i in 0..n {
++ if i > 10 {
++ dbg!(i);
++ break;
++ }
++ }
++ };
++ }
+}
--- /dev/null
- error: aborting due to 6 previous errors
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:7:5
+ |
+LL | / for item in &[item1] {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+ = note: `-D clippy::single-element-loop` implied by `-D warnings`
+help: try
+ |
+LL ~ {
+LL + let item = &item1;
+LL + dbg!(item);
+LL + }
+ |
+
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:11:5
+ |
+LL | / for item in [item1].iter() {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+help: try
+ |
+LL ~ {
+LL + let item = &item1;
+LL + dbg!(item);
+LL + }
+ |
+
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:15:5
+ |
+LL | / for item in &[0..5] {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+help: try
+ |
+LL ~ {
+LL + let item = &(0..5);
+LL + dbg!(item);
+LL + }
+ |
+
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:19:5
+ |
+LL | / for item in [0..5].iter_mut() {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+help: try
+ |
+LL ~ {
+LL + let item = &mut (0..5);
+LL + dbg!(item);
+LL + }
+ |
+
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:23:5
+ |
+LL | / for item in [0..5] {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+help: try
+ |
+LL ~ {
+LL + let item = 0..5;
+LL + dbg!(item);
+LL + }
+ |
+
+error: for loop over a single element
+ --> $DIR/single_element_loop.rs:27:5
+ |
+LL | / for item in [0..5].into_iter() {
+LL | | dbg!(item);
+LL | | }
+ | |_____^
+ |
+help: try
+ |
+LL ~ {
+LL + let item = 0..5;
+LL + dbg!(item);
+LL + }
+ |
+
++error: for loop over a single element
++ --> $DIR/single_element_loop.rs:46:5
++ |
++LL | / for _ in [42] {
++LL | | let _f = |n: u32| {
++LL | | for i in 0..n {
++LL | | if i > 10 {
++... |
++LL | | };
++LL | | }
++ | |_____^
++ |
++help: try
++ |
++LL ~ {
++LL + let _ = 42;
++LL + let _f = |n: u32| {
++LL + for i in 0..n {
++LL + if i > 10 {
++LL + dbg!(i);
++LL + break;
++LL + }
++LL + }
++LL + };
++LL + }
++ |
++
++error: aborting due to 7 previous errors
+
--- /dev/null
- error: this `to_owned` call clones the std::borrow::Cow<'_, str> itself and does not cause the std::borrow::Cow<'_, str> contents to become owned
++error: this `to_owned` call clones the Cow<'_, str> itself and does not cause the Cow<'_, str> contents to become owned
+ --> $DIR/suspicious_to_owned.rs:16:13
+ |
+LL | let _ = cow.to_owned();
+ | ^^^^^^^^^^^^^^ help: consider using, depending on intent: `cow.clone()` or `cow.into_owned()`
+ |
+ = note: `-D clippy::suspicious-to-owned` implied by `-D warnings`
+
- error: this `to_owned` call clones the std::borrow::Cow<'_, [char; 3]> itself and does not cause the std::borrow::Cow<'_, [char; 3]> contents to become owned
++error: this `to_owned` call clones the Cow<'_, [char; 3]> itself and does not cause the Cow<'_, [char; 3]> contents to become owned
+ --> $DIR/suspicious_to_owned.rs:26:13
+ |
+LL | let _ = cow.to_owned();
+ | ^^^^^^^^^^^^^^ help: consider using, depending on intent: `cow.clone()` or `cow.into_owned()`
+
- error: this `to_owned` call clones the std::borrow::Cow<'_, std::vec::Vec<char>> itself and does not cause the std::borrow::Cow<'_, std::vec::Vec<char>> contents to become owned
++error: this `to_owned` call clones the Cow<'_, Vec<char>> itself and does not cause the Cow<'_, Vec<char>> contents to become owned
+ --> $DIR/suspicious_to_owned.rs:36:13
+ |
+LL | let _ = cow.to_owned();
+ | ^^^^^^^^^^^^^^ help: consider using, depending on intent: `cow.clone()` or `cow.into_owned()`
+
- error: this `to_owned` call clones the std::borrow::Cow<'_, str> itself and does not cause the std::borrow::Cow<'_, str> contents to become owned
++error: this `to_owned` call clones the Cow<'_, str> itself and does not cause the Cow<'_, str> contents to become owned
+ --> $DIR/suspicious_to_owned.rs:46:13
+ |
+LL | let _ = cow.to_owned();
+ | ^^^^^^^^^^^^^^ help: consider using, depending on intent: `cow.clone()` or `cow.into_owned()`
+
+error: implicitly cloning a `String` by calling `to_owned` on its dereferenced type
+ --> $DIR/suspicious_to_owned.rs:60:13
+ |
+LL | let _ = String::from(moo).to_owned();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `String::from(moo).clone()`
+ |
+ = note: `-D clippy::implicit-clone` implied by `-D warnings`
+
+error: implicitly cloning a `Vec` by calling `to_owned` on its dereferenced type
+ --> $DIR/suspicious_to_owned.rs:61:13
+ |
+LL | let _ = moos_vec.to_owned();
+ | ^^^^^^^^^^^^^^^^^^^ help: consider using: `moos_vec.clone()`
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- error: using `clone` on type `std::option::Option<T>` which implements the `Copy` trait
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:23:5
+ |
+LL | rc.clone();
+ | ^^^^^^^^^^ help: try this: `Rc::<bool>::clone(&rc)`
+ |
+ = note: `-D clippy::clone-on-ref-ptr` implied by `-D warnings`
+
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:26:5
+ |
+LL | arc.clone();
+ | ^^^^^^^^^^^ help: try this: `Arc::<bool>::clone(&arc)`
+
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:29:5
+ |
+LL | rcweak.clone();
+ | ^^^^^^^^^^^^^^ help: try this: `Weak::<bool>::clone(&rcweak)`
+
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:32:5
+ |
+LL | arc_weak.clone();
+ | ^^^^^^^^^^^^^^^^ help: try this: `Weak::<bool>::clone(&arc_weak)`
+
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:36:33
+ |
+LL | let _: Arc<dyn SomeTrait> = x.clone();
+ | ^^^^^^^^^ help: try this: `Arc::<SomeImpl>::clone(&x)`
+
+error: using `clone` on type `T` which implements the `Copy` trait
+ --> $DIR/unnecessary_clone.rs:40:5
+ |
+LL | t.clone();
+ | ^^^^^^^^^ help: try removing the `clone` call: `t`
+ |
+ = note: `-D clippy::clone-on-copy` implied by `-D warnings`
+
- error: using `clone` on a double-reference; this will copy the reference of type `&std::vec::Vec<i32>` instead of cloning the inner type
++error: using `clone` on type `Option<T>` which implements the `Copy` trait
+ --> $DIR/unnecessary_clone.rs:42:5
+ |
+LL | Some(t).clone();
+ | ^^^^^^^^^^^^^^^ help: try removing the `clone` call: `Some(t)`
+
- LL | let z: &Vec<_> = <&std::vec::Vec<i32>>::clone(y);
- | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
++error: using `clone` on a double-reference; this will copy the reference of type `&Vec<i32>` instead of cloning the inner type
+ --> $DIR/unnecessary_clone.rs:48:22
+ |
+LL | let z: &Vec<_> = y.clone();
+ | ^^^^^^^^^
+ |
+ = note: `#[deny(clippy::clone_double_ref)]` on by default
+help: try dereferencing it
+ |
+LL | let z: &Vec<_> = &(*y).clone();
+ | ~~~~~~~~~~~~~
+help: or try being explicit if you are sure, that you want to clone a reference
+ |
- error: using `clone` on type `many_derefs::E` which implements the `Copy` trait
++LL | let z: &Vec<_> = <&Vec<i32>>::clone(y);
++ | ~~~~~~~~~~~~~~~~~~~~~
+
++error: using `clone` on type `E` which implements the `Copy` trait
+ --> $DIR/unnecessary_clone.rs:84:20
+ |
+LL | let _: E = a.clone();
+ | ^^^^^^^^^ help: try dereferencing it: `*****a`
+
+error: using `clone` on a double-reference; this will copy the reference of type `&[u8]` instead of cloning the inner type
+ --> $DIR/unnecessary_clone.rs:89:22
+ |
+LL | let _ = &mut encoded.clone();
+ | ^^^^^^^^^^^^^^^
+ |
+help: try dereferencing it
+ |
+LL | let _ = &mut &(*encoded).clone();
+ | ~~~~~~~~~~~~~~~~~~~
+help: or try being explicit if you are sure, that you want to clone a reference
+ |
+LL | let _ = &mut <&[u8]>::clone(encoded);
+ | ~~~~~~~~~~~~~~~~~~~~~~~
+
+error: using `clone` on a double-reference; this will copy the reference of type `&[u8]` instead of cloning the inner type
+ --> $DIR/unnecessary_clone.rs:90:18
+ |
+LL | let _ = &encoded.clone();
+ | ^^^^^^^^^^^^^^^
+ |
+help: try dereferencing it
+ |
+LL | let _ = &&(*encoded).clone();
+ | ~~~~~~~~~~~~~~~~~~~
+help: or try being explicit if you are sure, that you want to clone a reference
+ |
+LL | let _ = &<&[u8]>::clone(encoded);
+ | ~~~~~~~~~~~~~~~~~~~~~~~
+
+error: using `.clone()` on a ref-counted pointer
+ --> $DIR/unnecessary_clone.rs:108:14
+ |
+LL | Some(try_opt!(Some(rc)).clone())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `Rc::<u8>::clone(&try_opt!(Some(rc)))`
+
+error: aborting due to 12 previous errors
+
--- /dev/null
+#![warn(clippy::unused_self)]
+#![allow(clippy::boxed_local, clippy::fn_params_excessive_bools)]
+
+mod unused_self {
+ use std::pin::Pin;
+ use std::sync::{Arc, Mutex};
+
+ struct A;
+
+ impl A {
+ fn unused_self_move(self) {}
+ fn unused_self_ref(&self) {}
+ fn unused_self_mut_ref(&mut self) {}
+ fn unused_self_pin_ref(self: Pin<&Self>) {}
+ fn unused_self_pin_mut_ref(self: Pin<&mut Self>) {}
+ fn unused_self_pin_nested(self: Pin<Arc<Self>>) {}
+ fn unused_self_box(self: Box<Self>) {}
+ fn unused_with_other_used_args(&self, x: u8, y: u8) -> u8 {
+ x + y
+ }
+ fn unused_self_class_method(&self) {
+ Self::static_method();
+ }
+
+ fn static_method() {}
+ }
+}
+
+mod unused_self_allow {
+ struct A;
+
+ impl A {
+ // shouldn't trigger
+ #[allow(clippy::unused_self)]
+ fn unused_self_move(self) {}
+ }
+
+ struct B;
+
+ // shouldn't trigger
+ #[allow(clippy::unused_self)]
+ impl B {
+ fn unused_self_move(self) {}
+ }
+
+ struct C;
+
+ #[allow(clippy::unused_self)]
+ impl C {
+ #[warn(clippy::unused_self)]
+ fn some_fn((): ()) {}
+
+ // shouldn't trigger
+ fn unused_self_move(self) {}
+ }
+
+ pub struct D;
+
+ impl D {
+ // shouldn't trigger for public methods
+ pub fn unused_self_move(self) {}
+ }
++
++ pub struct E;
++
++ impl E {
++ // shouldn't trigger if body contains todo!()
++ pub fn unused_self_todo(self) {
++ let x = 42;
++ todo!()
++ }
++ }
+}
+
+pub use unused_self_allow::D;
+
+mod used_self {
+ use std::pin::Pin;
+
+ struct A {
+ x: u8,
+ }
+
+ impl A {
+ fn used_self_move(self) -> u8 {
+ self.x
+ }
+ fn used_self_ref(&self) -> u8 {
+ self.x
+ }
+ fn used_self_mut_ref(&mut self) {
+ self.x += 1
+ }
+ fn used_self_pin_ref(self: Pin<&Self>) -> u8 {
+ self.x
+ }
+ fn used_self_box(self: Box<Self>) -> u8 {
+ self.x
+ }
+ fn used_self_with_other_unused_args(&self, x: u8, y: u8) -> u8 {
+ self.x
+ }
+ fn used_in_nested_closure(&self) -> u8 {
+ let mut a = || -> u8 { self.x };
+ a()
+ }
+
+ #[allow(clippy::collapsible_if)]
+ fn used_self_method_nested_conditions(&self, a: bool, b: bool, c: bool, d: bool) {
+ if a {
+ if b {
+ if c {
+ if d {
+ self.used_self_ref();
+ }
+ }
+ }
+ }
+ }
+
+ fn foo(&self) -> u32 {
+ let mut sum = 0u32;
+ for i in 0..self.x {
+ sum += i as u32;
+ }
+ sum
+ }
+
+ fn bar(&mut self, x: u8) -> u32 {
+ let mut y = 0u32;
+ for i in 0..x {
+ y += self.foo()
+ }
+ y
+ }
+ }
+}
+
+mod not_applicable {
+ use std::fmt;
+
+ struct A;
+
+ impl fmt::Debug for A {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "A")
+ }
+ }
+
+ impl A {
+ fn method(x: u8, y: u8) {}
+ }
+
+ trait B {
+ fn method(&self) {}
+ }
+}
+
+fn main() {}
--- /dev/null
- = help: consider refactoring to a associated function
+error: unused `self` argument
+ --> $DIR/unused_self.rs:11:29
+ |
+LL | fn unused_self_move(self) {}
+ | ^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+ = note: `-D clippy::unused-self` implied by `-D warnings`
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:12:28
+ |
+LL | fn unused_self_ref(&self) {}
+ | ^^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:13:32
+ |
+LL | fn unused_self_mut_ref(&mut self) {}
+ | ^^^^^^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:14:32
+ |
+LL | fn unused_self_pin_ref(self: Pin<&Self>) {}
+ | ^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:15:36
+ |
+LL | fn unused_self_pin_mut_ref(self: Pin<&mut Self>) {}
+ | ^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:16:35
+ |
+LL | fn unused_self_pin_nested(self: Pin<Arc<Self>>) {}
+ | ^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:17:28
+ |
+LL | fn unused_self_box(self: Box<Self>) {}
+ | ^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:18:40
+ |
+LL | fn unused_with_other_used_args(&self, x: u8, y: u8) -> u8 {
+ | ^^^^^
+ |
- = help: consider refactoring to a associated function
++ = help: consider refactoring to an associated function
+
+error: unused `self` argument
+ --> $DIR/unused_self.rs:21:37
+ |
+LL | fn unused_self_class_method(&self) {
+ | ^^^^^
+ |
++ = help: consider refactoring to an associated function
+
+error: aborting due to 9 previous errors
+
projects / rust.git / commitdiff