--- /dev/null
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Changelog Update](book/src/development/infrastructure/changelog_update.md) if you want to update this
+document.
+
+## Unreleased / In Rust Nightly
+
+[7c21f91b...master](https://github.com/rust-lang/rust-clippy/compare/7c21f91b...master)
+
+## Rust 1.62
+
+Current stable, 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)
+* [`blacklisted_name`]: Now allows blacklisted 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)
+* [`blacklisted_name`]: Remove `bar` from the default configuration
+ [#5712](https://github.com/rust-lang/rust-clippy/pull/5712)
+* [`redundant_pattern_matching`]: Avoid suggesting non-`const fn` calls in const contexts
+ [#5724](https://github.com/rust-lang/rust-clippy/pull/5724)
+
+### Suggestion Fixes/Improvements
+
+* Fix suggestion of [`unit_arg`] lint, so that it suggest semantic equivalent code
+ [#4455](https://github.com/rust-lang/rust-clippy/pull/4455)
+* Add auto applicable suggestion to [`macro_use_imports`]
+ [#5279](https://github.com/rust-lang/rust-clippy/pull/5279)
+
+### ICE Fixes
+
+* Fix ICE in the `consts` module of Clippy [#5709](https://github.com/rust-lang/rust-clippy/pull/5709)
+
+### Documentation Improvements
+
+* Improve code examples across multiple lints [#5664](https://github.com/rust-lang/rust-clippy/pull/5664)
+
+### Others
+
+* Introduce a `--rustc` flag to `clippy-driver`, which turns `clippy-driver`
+ into `rustc` and passes all the given arguments to `rustc`. This is especially
+ useful for tools that need the `rustc` version Clippy was compiled with,
+ instead of the Clippy version. E.g. `clippy-driver --rustc --version` will
+ print the output of `rustc --version`.
+ [#5178](https://github.com/rust-lang/rust-clippy/pull/5178)
+* New issue templates now make it easier to complain if Clippy is too annoying
+ or not annoying enough! [#5735](https://github.com/rust-lang/rust-clippy/pull/5735)
+
+## Rust 1.45
+
+Released 2020-07-16
+
+[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)
+
+### New lints
+
+* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
+* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
+* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
+* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
+* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
+* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
+* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
+* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
+* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)
+
+### Moves and Deprecations
+
+* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
+* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
+* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
+* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
+* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
+* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+
+### Enhancements
+
+* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
+* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
+* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
+* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)
+
+### False Positive Fixes
+
+* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
+* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
+* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
+* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
+* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
+* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
+* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
+* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
+* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
+* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
+* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
+* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
+and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
+* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)
+
+### Suggestion Improvements
+
+* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
+* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
+* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
+* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)
+
+### ICE Fixes
+
+* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
+* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)
+
+### Documentation
+
+* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
+* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)
+
+## Rust 1.44
+
+Released 2020-06-04
+
+[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)
+
+### New lints
+
+* [`explicit_deref_methods`] [#5226](https://github.com/rust-lang/rust-clippy/pull/5226)
+* [`implicit_saturating_sub`] [#5427](https://github.com/rust-lang/rust-clippy/pull/5427)
+* [`macro_use_imports`] [#5230](https://github.com/rust-lang/rust-clippy/pull/5230)
+* [`verbose_file_reads`] [#5272](https://github.com/rust-lang/rust-clippy/pull/5272)
+* [`future_not_send`] [#5423](https://github.com/rust-lang/rust-clippy/pull/5423)
+* [`redundant_pub_crate`] [#5319](https://github.com/rust-lang/rust-clippy/pull/5319)
+* [`large_const_arrays`] [#5248](https://github.com/rust-lang/rust-clippy/pull/5248)
+* [`result_map_or_into_option`] [#5415](https://github.com/rust-lang/rust-clippy/pull/5415)
+* [`redundant_allocation`] [#5349](https://github.com/rust-lang/rust-clippy/pull/5349)
+* [`fn_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+* [`vtable_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+
+
+### Moves and Deprecations
+
+* Deprecate [`replace_consts`] lint [#5380](https://github.com/rust-lang/rust-clippy/pull/5380)
+* Move [`cognitive_complexity`] to nursery [#5428](https://github.com/rust-lang/rust-clippy/pull/5428)
+* Move [`useless_transmute`] to nursery [#5364](https://github.com/rust-lang/rust-clippy/pull/5364)
+* Downgrade [`inefficient_to_string`] to pedantic [#5412](https://github.com/rust-lang/rust-clippy/pull/5412)
+* Downgrade [`option_option`] to pedantic [#5401](https://github.com/rust-lang/rust-clippy/pull/5401)
+* Downgrade [`unreadable_literal`] to pedantic [#5419](https://github.com/rust-lang/rust-clippy/pull/5419)
+* Downgrade [`let_unit_value`] to pedantic [#5409](https://github.com/rust-lang/rust-clippy/pull/5409)
+* Downgrade [`trivially_copy_pass_by_ref`] to pedantic [#5410](https://github.com/rust-lang/rust-clippy/pull/5410)
+* Downgrade [`implicit_hasher`] to pedantic [#5411](https://github.com/rust-lang/rust-clippy/pull/5411)
+
+### Enhancements
+
+* On _nightly_ you can now use `cargo clippy --fix -Z unstable-options` to
+ auto-fix lints that support this [#5363](https://github.com/rust-lang/rust-clippy/pull/5363)
+* Make [`redundant_clone`] also trigger on cases where the cloned value is not
+ consumed. [#5304](https://github.com/rust-lang/rust-clippy/pull/5304)
+* Expand [`integer_arithmetic`] to also disallow bit-shifting [#5430](https://github.com/rust-lang/rust-clippy/pull/5430)
+* [`option_as_ref_deref`] now detects more deref cases [#5425](https://github.com/rust-lang/rust-clippy/pull/5425)
+* [`large_enum_variant`] now report the sizes of the largest and second-largest variants [#5466](https://github.com/rust-lang/rust-clippy/pull/5466)
+* [`bool_comparison`] now also checks for inequality comparisons that can be
+ written more concisely [#5365](https://github.com/rust-lang/rust-clippy/pull/5365)
+* Expand [`clone_on_copy`] to work in method call arguments as well [#5441](https://github.com/rust-lang/rust-clippy/pull/5441)
+* [`redundant_pattern_matching`] now also handles `while let` [#5483](https://github.com/rust-lang/rust-clippy/pull/5483)
+* [`integer_arithmetic`] now also lints references of integers [#5329](https://github.com/rust-lang/rust-clippy/pull/5329)
+* Expand [`float_cmp_const`] to also work on arrays [#5345](https://github.com/rust-lang/rust-clippy/pull/5345)
+* Trigger [`map_flatten`] when map is called on an `Option` [#5473](https://github.com/rust-lang/rust-clippy/pull/5473)
+
+### False Positive Fixes
+
+* [`many_single_char_names`] [#5468](https://github.com/rust-lang/rust-clippy/pull/5468)
+* [`should_implement_trait`] [#5437](https://github.com/rust-lang/rust-clippy/pull/5437)
+* [`unused_self`] [#5387](https://github.com/rust-lang/rust-clippy/pull/5387)
+* [`redundant_clone`] [#5453](https://github.com/rust-lang/rust-clippy/pull/5453)
+* [`precedence`] [#5445](https://github.com/rust-lang/rust-clippy/pull/5445)
+* [`suspicious_op_assign_impl`] [#5424](https://github.com/rust-lang/rust-clippy/pull/5424)
+* [`needless_lifetimes`] [#5293](https://github.com/rust-lang/rust-clippy/pull/5293)
+* [`redundant_pattern`] [#5287](https://github.com/rust-lang/rust-clippy/pull/5287)
+* [`inconsistent_digit_grouping`] [#5451](https://github.com/rust-lang/rust-clippy/pull/5451)
+
+
+### Suggestion Improvements
+
+* Improved [`question_mark`] lint suggestion so that it doesn't add redundant `as_ref()` [#5481](https://github.com/rust-lang/rust-clippy/pull/5481)
+* Improve the suggested placeholder in [`option_map_unit_fn`] [#5292](https://github.com/rust-lang/rust-clippy/pull/5292)
+* Improve suggestion for [`match_single_binding`] when triggered inside a closure [#5350](https://github.com/rust-lang/rust-clippy/pull/5350)
+
+### ICE Fixes
+
+* Handle the unstable `trivial_bounds` feature [#5296](https://github.com/rust-lang/rust-clippy/pull/5296)
+* `shadow_*` lints [#5297](https://github.com/rust-lang/rust-clippy/pull/5297)
+
+### Documentation
+
+* Fix documentation generation for configurable lints [#5353](https://github.com/rust-lang/rust-clippy/pull/5353)
+* Update documentation for [`new_ret_no_self`] [#5448](https://github.com/rust-lang/rust-clippy/pull/5448)
+* The documentation for [`option_option`] now suggest using a tri-state enum [#5403](https://github.com/rust-lang/rust-clippy/pull/5403)
+* Fix bit mask example in [`verbose_bit_mask`] documentation [#5454](https://github.com/rust-lang/rust-clippy/pull/5454)
+* [`wildcard_imports`] documentation now mentions that `use ...::prelude::*` is
+ not linted [#5312](https://github.com/rust-lang/rust-clippy/pull/5312)
+
+## Rust 1.43
+
+Released 2020-04-23
+
+[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)
+
+### New lints
+
+* [`imprecise_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`suboptimal_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`wildcard_imports`] [#5029](https://github.com/rust-lang/rust-clippy/pull/5029)
+* [`single_component_path_imports`] [#5058](https://github.com/rust-lang/rust-clippy/pull/5058)
+* [`match_single_binding`] [#5061](https://github.com/rust-lang/rust-clippy/pull/5061)
+* [`let_underscore_lock`] [#5101](https://github.com/rust-lang/rust-clippy/pull/5101)
+* [`struct_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`fn_params_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`option_env_unwrap`] [#5148](https://github.com/rust-lang/rust-clippy/pull/5148)
+* [`lossy_float_literal`] [#5202](https://github.com/rust-lang/rust-clippy/pull/5202)
+* [`rest_pat_in_fully_bound_structs`] [#5258](https://github.com/rust-lang/rust-clippy/pull/5258)
+
+### Moves and Deprecations
+
+* Move [`unneeded_field_pattern`] to pedantic group [#5200](https://github.com/rust-lang/rust-clippy/pull/5200)
+
+### Enhancements
+
+* Make [`missing_errors_doc`] lint also trigger on `async` functions
+ [#5181](https://github.com/rust-lang/rust-clippy/pull/5181)
+* Add more constants to [`approx_constant`] [#5193](https://github.com/rust-lang/rust-clippy/pull/5193)
+* Extend [`question_mark`] lint [#5266](https://github.com/rust-lang/rust-clippy/pull/5266)
+
+### False Positive Fixes
+
+* [`use_debug`] [#5047](https://github.com/rust-lang/rust-clippy/pull/5047)
+* [`unnecessary_unwrap`] [#5132](https://github.com/rust-lang/rust-clippy/pull/5132)
+* [`zero_prefixed_literal`] [#5170](https://github.com/rust-lang/rust-clippy/pull/5170)
+* [`missing_const_for_fn`] [#5216](https://github.com/rust-lang/rust-clippy/pull/5216)
+
+### Suggestion Improvements
+
+* Improve suggestion when blocks of code are suggested [#5134](https://github.com/rust-lang/rust-clippy/pull/5134)
+
+### ICE Fixes
+
+* `misc_early` lints [#5129](https://github.com/rust-lang/rust-clippy/pull/5129)
+* [`missing_errors_doc`] [#5213](https://github.com/rust-lang/rust-clippy/pull/5213)
+* Fix ICE when evaluating `usize`s [#5256](https://github.com/rust-lang/rust-clippy/pull/5256)
+
+### Documentation
+
+* Improve documentation of [`iter_nth_zero`]
+* Add documentation pages for stable releases [#5171](https://github.com/rust-lang/rust-clippy/pull/5171)
+
+### Others
+
+* Clippy now completely runs on GitHub Actions [#5190](https://github.com/rust-lang/rust-clippy/pull/5190)
+
+
+## Rust 1.42
+
+Released 2020-03-12
+
+[69f99e7...4ee1206](https://github.com/rust-lang/rust-clippy/compare/69f99e7...4ee1206)
+
+### New lints
+
+* [`filetype_is_file`] [#4543](https://github.com/rust-lang/rust-clippy/pull/4543)
+* [`let_underscore_must_use`] [#4823](https://github.com/rust-lang/rust-clippy/pull/4823)
+* [`modulo_arithmetic`] [#4867](https://github.com/rust-lang/rust-clippy/pull/4867)
+* [`mem_replace_with_default`] [#4881](https://github.com/rust-lang/rust-clippy/pull/4881)
+* [`mutable_key_type`] [#4885](https://github.com/rust-lang/rust-clippy/pull/4885)
+* [`option_as_ref_deref`] [#4945](https://github.com/rust-lang/rust-clippy/pull/4945)
+* [`wildcard_in_or_patterns`] [#4960](https://github.com/rust-lang/rust-clippy/pull/4960)
+* [`iter_nth_zero`] [#4966](https://github.com/rust-lang/rust-clippy/pull/4966)
+* `invalid_atomic_ordering` [#4999](https://github.com/rust-lang/rust-clippy/pull/4999)
+* [`skip_while_next`] [#5067](https://github.com/rust-lang/rust-clippy/pull/5067)
+
+### Moves and Deprecations
+
+* Move [`transmute_float_to_int`] from nursery to complexity group
+ [#5015](https://github.com/rust-lang/rust-clippy/pull/5015)
+* Move [`range_plus_one`] to pedantic group [#5057](https://github.com/rust-lang/rust-clippy/pull/5057)
+* Move [`debug_assert_with_mut_call`] to nursery group [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Deprecate `unused_label` [#4930](https://github.com/rust-lang/rust-clippy/pull/4930)
+
+### Enhancements
+
+* Lint vectored IO in [`unused_io_amount`] [#5027](https://github.com/rust-lang/rust-clippy/pull/5027)
+* Make [`vec_box`] configurable by adding a size threshold [#5081](https://github.com/rust-lang/rust-clippy/pull/5081)
+* Also lint constants in [`cmp_nan`] [#4910](https://github.com/rust-lang/rust-clippy/pull/4910)
+* Fix false negative in [`expect_fun_call`] [#4915](https://github.com/rust-lang/rust-clippy/pull/4915)
+* Fix false negative in [`redundant_clone`] [#5017](https://github.com/rust-lang/rust-clippy/pull/5017)
+
+### False Positive Fixes
+
+* [`map_clone`] [#4937](https://github.com/rust-lang/rust-clippy/pull/4937)
+* [`replace_consts`] [#4977](https://github.com/rust-lang/rust-clippy/pull/4977)
+* [`let_and_return`] [#5008](https://github.com/rust-lang/rust-clippy/pull/5008)
+* [`eq_op`] [#5079](https://github.com/rust-lang/rust-clippy/pull/5079)
+* [`possible_missing_comma`] [#5083](https://github.com/rust-lang/rust-clippy/pull/5083)
+* [`debug_assert_with_mut_call`] [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Don't trigger [`let_underscore_must_use`] in external macros
+ [#5082](https://github.com/rust-lang/rust-clippy/pull/5082)
+* Don't trigger [`empty_loop`] in `no_std` crates [#5086](https://github.com/rust-lang/rust-clippy/pull/5086)
+
+### Suggestion Improvements
+
+* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634)
+* [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934)
+* [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935)
+* [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956)
+* `unknown_clippy_lints` [#4963](https://github.com/rust-lang/rust-clippy/pull/4963)
+* [`explicit_into_iter_loop`] [#4978](https://github.com/rust-lang/rust-clippy/pull/4978)
+* [`useless_attribute`] [#5022](https://github.com/rust-lang/rust-clippy/pull/5022)
+* `if_let_some_result` [#5032](https://github.com/rust-lang/rust-clippy/pull/5032)
+
+### ICE fixes
+
+* [`unsound_collection_transmute`] [#4975](https://github.com/rust-lang/rust-clippy/pull/4975)
+
+### Documentation
+
+* Improve documentation of [`empty_enum`], [`replace_consts`], [`redundant_clone`], and [`iterator_step_by_zero`]
+
+
+## Rust 1.41
+
+Released 2020-01-30
+
+[c8e3cfb...69f99e7](https://github.com/rust-lang/rust-clippy/compare/c8e3cfb...69f99e7)
+
+* New Lints:
+ * [`exit`] [#4697](https://github.com/rust-lang/rust-clippy/pull/4697)
+ * [`to_digit_is_some`] [#4801](https://github.com/rust-lang/rust-clippy/pull/4801)
+ * [`tabs_in_doc_comments`] [#4806](https://github.com/rust-lang/rust-clippy/pull/4806)
+ * [`large_stack_arrays`] [#4807](https://github.com/rust-lang/rust-clippy/pull/4807)
+ * [`same_functions_in_if_condition`] [#4814](https://github.com/rust-lang/rust-clippy/pull/4814)
+ * [`zst_offset`] [#4816](https://github.com/rust-lang/rust-clippy/pull/4816)
+ * [`as_conversions`] [#4821](https://github.com/rust-lang/rust-clippy/pull/4821)
+ * [`missing_errors_doc`] [#4884](https://github.com/rust-lang/rust-clippy/pull/4884)
+ * [`transmute_float_to_int`] [#4889](https://github.com/rust-lang/rust-clippy/pull/4889)
+* Remove plugin interface, see
+ [Inside Rust Blog](https://blog.rust-lang.org/inside-rust/2019/11/04/Clippy-removes-plugin-interface.html) for
+ details [#4714](https://github.com/rust-lang/rust-clippy/pull/4714)
+* Move [`use_self`] to nursery group [#4863](https://github.com/rust-lang/rust-clippy/pull/4863)
+* Deprecate `into_iter_on_array` [#4788](https://github.com/rust-lang/rust-clippy/pull/4788)
+* Expand [`string_lit_as_bytes`] to also trigger when literal has escapes
+ [#4808](https://github.com/rust-lang/rust-clippy/pull/4808)
+* Fix false positive in `comparison_chain` [#4842](https://github.com/rust-lang/rust-clippy/pull/4842)
+* Fix false positive in `while_immutable_condition` [#4730](https://github.com/rust-lang/rust-clippy/pull/4730)
+* Fix false positive in `explicit_counter_loop` [#4803](https://github.com/rust-lang/rust-clippy/pull/4803)
+* Fix false positive in `must_use_candidate` [#4794](https://github.com/rust-lang/rust-clippy/pull/4794)
+* Fix false positive in `print_with_newline` and `write_with_newline`
+ [#4769](https://github.com/rust-lang/rust-clippy/pull/4769)
+* Fix false positive in `derive_hash_xor_eq` [#4766](https://github.com/rust-lang/rust-clippy/pull/4766)
+* Fix false positive in `missing_inline_in_public_items` [#4870](https://github.com/rust-lang/rust-clippy/pull/4870)
+* Fix false positive in `string_add` [#4880](https://github.com/rust-lang/rust-clippy/pull/4880)
+* Fix false positive in `float_arithmetic` [#4851](https://github.com/rust-lang/rust-clippy/pull/4851)
+* Fix false positive in `cast_sign_loss` [#4883](https://github.com/rust-lang/rust-clippy/pull/4883)
+* Fix false positive in `manual_swap` [#4877](https://github.com/rust-lang/rust-clippy/pull/4877)
+* Fix ICEs occurring while checking some block expressions [#4772](https://github.com/rust-lang/rust-clippy/pull/4772)
+* Fix ICE in `use_self` [#4776](https://github.com/rust-lang/rust-clippy/pull/4776)
+* Fix ICEs related to `const_generics` [#4780](https://github.com/rust-lang/rust-clippy/pull/4780)
+* Display help when running `clippy-driver` without arguments, instead of ICEing
+ [#4810](https://github.com/rust-lang/rust-clippy/pull/4810)
+* Clippy has its own ICE message now [#4588](https://github.com/rust-lang/rust-clippy/pull/4588)
+* Show deprecated lints in the documentation again [#4757](https://github.com/rust-lang/rust-clippy/pull/4757)
+* Improve Documentation by adding positive examples to some lints
+ [#4832](https://github.com/rust-lang/rust-clippy/pull/4832)
+
+## Rust 1.40
+
+Released 2019-12-19
+
+[4e7e71b...c8e3cfb](https://github.com/rust-lang/rust-clippy/compare/4e7e71b...c8e3cfb)
+
+* New Lints:
+ * [`unneeded_wildcard_pattern`] [#4537](https://github.com/rust-lang/rust-clippy/pull/4537)
+ * [`needless_doctest_main`] [#4603](https://github.com/rust-lang/rust-clippy/pull/4603)
+ * [`suspicious_unary_op_formatting`] [#4615](https://github.com/rust-lang/rust-clippy/pull/4615)
+ * [`debug_assert_with_mut_call`] [#4680](https://github.com/rust-lang/rust-clippy/pull/4680)
+ * [`unused_self`] [#4619](https://github.com/rust-lang/rust-clippy/pull/4619)
+ * [`inefficient_to_string`] [#4683](https://github.com/rust-lang/rust-clippy/pull/4683)
+ * [`must_use_unit`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`must_use_candidate`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`double_must_use`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`comparison_chain`] [#4569](https://github.com/rust-lang/rust-clippy/pull/4569)
+ * [`unsound_collection_transmute`] [#4592](https://github.com/rust-lang/rust-clippy/pull/4592)
+ * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+* Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736)
+* Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613)
+* Expand `integer_arithmetic` to also detect mutating arithmetic like `+=` [#4585](https://github.com/rust-lang/rust-clippy/pull/4585)
+* Fix false positive in `nonminimal_bool` [#4568](https://github.com/rust-lang/rust-clippy/pull/4568)
+* Fix false positive in `missing_safety_doc` [#4611](https://github.com/rust-lang/rust-clippy/pull/4611)
+* Fix false positive in `cast_sign_loss` [#4614](https://github.com/rust-lang/rust-clippy/pull/4614)
+* Fix false positive in `redundant_clone` [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Fix false positive in `try_err` [#4721](https://github.com/rust-lang/rust-clippy/pull/4721)
+* Fix false positive in `toplevel_ref_arg` [#4570](https://github.com/rust-lang/rust-clippy/pull/4570)
+* Fix false positive in `multiple_inherent_impl` [#4593](https://github.com/rust-lang/rust-clippy/pull/4593)
+* Improve more suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4575](https://github.com/rust-lang/rust-clippy/pull/4575)
+* Improve suggestion for `zero_ptr` [#4599](https://github.com/rust-lang/rust-clippy/pull/4599)
+* Improve suggestion for `explicit_counter_loop` [#4691](https://github.com/rust-lang/rust-clippy/pull/4691)
+* Improve suggestion for `mul_add` [#4602](https://github.com/rust-lang/rust-clippy/pull/4602)
+* Improve suggestion for `assertions_on_constants` [#4635](https://github.com/rust-lang/rust-clippy/pull/4635)
+* Fix ICE in `use_self` [#4671](https://github.com/rust-lang/rust-clippy/pull/4671)
+* Fix ICE when encountering const casts [#4590](https://github.com/rust-lang/rust-clippy/pull/4590)
+
+## Rust 1.39
+
+Released 2019-11-07
+
+[3aea860...4e7e71b](https://github.com/rust-lang/rust-clippy/compare/3aea860...4e7e71b)
+
+* New Lints:
+ * [`uninit_assumed_init`] [#4479](https://github.com/rust-lang/rust-clippy/pull/4479)
+ * [`flat_map_identity`] [#4231](https://github.com/rust-lang/rust-clippy/pull/4231)
+ * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
+ * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
+ * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
+ * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
+ * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
+* Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
+* Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
+* Move `cast_lossless` to pedantic group [#4539](https://github.com/rust-lang/rust-clippy/pull/4539)
+* `temporary_cstring_as_ptr` now catches more cases [#4425](https://github.com/rust-lang/rust-clippy/pull/4425)
+* `use_self` now works in constructors, too [#4525](https://github.com/rust-lang/rust-clippy/pull/4525)
+* `cargo_common_metadata` now checks for license files [#4518](https://github.com/rust-lang/rust-clippy/pull/4518)
+* `cognitive_complexity` now includes the measured complexity in the warning message [#4469](https://github.com/rust-lang/rust-clippy/pull/4469)
+* Fix false positives in `block_in_if_*` lints [#4458](https://github.com/rust-lang/rust-clippy/pull/4458)
+* Fix false positive in `cast_lossless` [#4473](https://github.com/rust-lang/rust-clippy/pull/4473)
+* Fix false positive in `clone_on_copy` [#4411](https://github.com/rust-lang/rust-clippy/pull/4411)
+* Fix false positive in `deref_addrof` [#4487](https://github.com/rust-lang/rust-clippy/pull/4487)
+* Fix false positive in `too_many_lines` [#4490](https://github.com/rust-lang/rust-clippy/pull/4490)
+* Fix false positive in `new_ret_no_self` [#4365](https://github.com/rust-lang/rust-clippy/pull/4365)
+* Fix false positive in `manual_swap` [#4478](https://github.com/rust-lang/rust-clippy/pull/4478)
+* Fix false positive in `missing_const_for_fn` [#4450](https://github.com/rust-lang/rust-clippy/pull/4450)
+* Fix false positive in `extra_unused_lifetimes` [#4477](https://github.com/rust-lang/rust-clippy/pull/4477)
+* Fix false positive in `inherent_to_string` [#4460](https://github.com/rust-lang/rust-clippy/pull/4460)
+* Fix false positive in `map_entry` [#4495](https://github.com/rust-lang/rust-clippy/pull/4495)
+* Fix false positive in `unused_unit` [#4445](https://github.com/rust-lang/rust-clippy/pull/4445)
+* Fix false positive in `redundant_pattern` [#4489](https://github.com/rust-lang/rust-clippy/pull/4489)
+* Fix false positive in `wrong_self_convention` [#4369](https://github.com/rust-lang/rust-clippy/pull/4369)
+* Improve various suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4558](https://github.com/rust-lang/rust-clippy/pull/4558)
+* Improve suggestions for `redundant_pattern_matching` [#4352](https://github.com/rust-lang/rust-clippy/pull/4352)
+* Improve suggestions for `explicit_write` [#4544](https://github.com/rust-lang/rust-clippy/pull/4544)
+* Improve suggestion for `or_fun_call` [#4522](https://github.com/rust-lang/rust-clippy/pull/4522)
+* Improve suggestion for `match_as_ref` [#4446](https://github.com/rust-lang/rust-clippy/pull/4446)
+* Improve suggestion for `unnecessary_fold_span` [#4382](https://github.com/rust-lang/rust-clippy/pull/4382)
+* Add suggestions for `unseparated_literal_suffix` [#4401](https://github.com/rust-lang/rust-clippy/pull/4401)
+* Add suggestions for `char_lit_as_u8` [#4418](https://github.com/rust-lang/rust-clippy/pull/4418)
+
+## Rust 1.38
+
+Released 2019-09-26
+
+[e3cb40e...3aea860](https://github.com/rust-lang/rust-clippy/compare/e3cb40e...3aea860)
+
+* New Lints:
+ * [`main_recursion`] [#4203](https://github.com/rust-lang/rust-clippy/pull/4203)
+ * [`inherent_to_string`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`inherent_to_string_shadow_display`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`type_repetition_in_bounds`] [#3766](https://github.com/rust-lang/rust-clippy/pull/3766)
+ * [`try_err`] [#4222](https://github.com/rust-lang/rust-clippy/pull/4222)
+* Move `{unnecessary,panicking}_unwrap` out of nursery [#4307](https://github.com/rust-lang/rust-clippy/pull/4307)
+* Extend the `use_self` lint to suggest uses of `Self::Variant` [#4308](https://github.com/rust-lang/rust-clippy/pull/4308)
+* Improve suggestion for needless return [#4262](https://github.com/rust-lang/rust-clippy/pull/4262)
+* Add auto-fixable suggestion for `let_unit` [#4337](https://github.com/rust-lang/rust-clippy/pull/4337)
+* Fix false positive in `pub_enum_variant_names` and `enum_variant_names` [#4345](https://github.com/rust-lang/rust-clippy/pull/4345)
+* Fix false positive in `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Fix false positive in `string_lit_as_bytes` [#4233](https://github.com/rust-lang/rust-clippy/pull/4233)
+* Fix false positive in `needless_lifetimes` [#4266](https://github.com/rust-lang/rust-clippy/pull/4266)
+* Fix false positive in `float_cmp` [#4275](https://github.com/rust-lang/rust-clippy/pull/4275)
+* Fix false positives in `needless_return` [#4274](https://github.com/rust-lang/rust-clippy/pull/4274)
+* Fix false negative in `match_same_arms` [#4246](https://github.com/rust-lang/rust-clippy/pull/4246)
+* Fix incorrect suggestion for `needless_bool` [#4335](https://github.com/rust-lang/rust-clippy/pull/4335)
+* Improve suggestion for `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Improve suggestion for `single_char_literal` [#4361](https://github.com/rust-lang/rust-clippy/pull/4361)
+* Improve suggestion for `len_zero` [#4314](https://github.com/rust-lang/rust-clippy/pull/4314)
+* Fix ICE in `implicit_hasher` [#4268](https://github.com/rust-lang/rust-clippy/pull/4268)
+* Fix allow bug in `trivially_copy_pass_by_ref` [#4250](https://github.com/rust-lang/rust-clippy/pull/4250)
+
+## Rust 1.37
+
+Released 2019-08-15
+
+[082cfa7...e3cb40e](https://github.com/rust-lang/rust-clippy/compare/082cfa7...e3cb40e)
+
+* New Lints:
+ * [`checked_conversions`] [#4088](https://github.com/rust-lang/rust-clippy/pull/4088)
+ * [`get_last_with_len`] [#3832](https://github.com/rust-lang/rust-clippy/pull/3832)
+ * [`integer_division`] [#4195](https://github.com/rust-lang/rust-clippy/pull/4195)
+* Renamed Lint: `const_static_lifetime` is now called [`redundant_static_lifetimes`].
+ The lint now covers statics in addition to consts [#4162](https://github.com/rust-lang/rust-clippy/pull/4162)
+* [`match_same_arms`] now warns for all identical arms, instead of only the first one [#4102](https://github.com/rust-lang/rust-clippy/pull/4102)
+* [`needless_return`] now works with void functions [#4220](https://github.com/rust-lang/rust-clippy/pull/4220)
+* Fix false positive in [`redundant_closure`] [#4190](https://github.com/rust-lang/rust-clippy/pull/4190)
+* Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107)
+* Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214)
+* Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136)
+* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164)
+* Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119)
+* Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137)
+* Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071)
+* Add macro check for [`unreadable_literal`] [#4099](https://github.com/rust-lang/rust-clippy/pull/4099)
+
+## Rust 1.36
+
+Released 2019-07-04
+
+[eb9f9b1...082cfa7](https://github.com/rust-lang/rust-clippy/compare/eb9f9b1...082cfa7)
+
+* New lints: [`find_map`], [`filter_map_next`] [#4039](https://github.com/rust-lang/rust-clippy/pull/4039)
+* New lint: [`path_buf_push_overwrite`] [#3954](https://github.com/rust-lang/rust-clippy/pull/3954)
+* Move `path_buf_push_overwrite` to the nursery [#4013](https://github.com/rust-lang/rust-clippy/pull/4013)
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Allow allowing of [`toplevel_ref_arg`] lint [#4007](https://github.com/rust-lang/rust-clippy/pull/4007)
+* Fix false negative in [`or_fun_call`] pertaining to nested constructors [#4084](https://github.com/rust-lang/rust-clippy/pull/4084)
+* Fix false positive in [`or_fun_call`] pertaining to enum variant constructors [#4018](https://github.com/rust-lang/rust-clippy/pull/4018)
+* Fix false positive in [`useless_let_if_seq`] pertaining to interior mutability [#4035](https://github.com/rust-lang/rust-clippy/pull/4035)
+* Fix false positive in [`redundant_closure`] pertaining to non-function types [#4008](https://github.com/rust-lang/rust-clippy/pull/4008)
+* Fix false positive in [`let_and_return`] pertaining to attributes on `let`s [#4024](https://github.com/rust-lang/rust-clippy/pull/4024)
+* Fix false positive in [`module_name_repetitions`] lint pertaining to attributes [#4006](https://github.com/rust-lang/rust-clippy/pull/4006)
+* Fix false positive on [`assertions_on_constants`] pertaining to `debug_assert!` [#3989](https://github.com/rust-lang/rust-clippy/pull/3989)
+* Improve suggestion in [`map_clone`] to suggest `.copied()` where applicable [#3970](https://github.com/rust-lang/rust-clippy/pull/3970) [#4043](https://github.com/rust-lang/rust-clippy/pull/4043)
+* Improve suggestion for [`search_is_some`] [#4049](https://github.com/rust-lang/rust-clippy/pull/4049)
+* Improve suggestion applicability for [`naive_bytecount`] [#3984](https://github.com/rust-lang/rust-clippy/pull/3984)
+* Improve suggestion applicability for [`while_let_loop`] [#3975](https://github.com/rust-lang/rust-clippy/pull/3975)
+* Improve diagnostics for [`too_many_arguments`] [#4053](https://github.com/rust-lang/rust-clippy/pull/4053)
+* Improve diagnostics for [`cast_lossless`] [#4021](https://github.com/rust-lang/rust-clippy/pull/4021)
+* Deal with macro checks in desugarings better [#4082](https://github.com/rust-lang/rust-clippy/pull/4082)
+* Add macro check for [`unnecessary_cast`] [#4026](https://github.com/rust-lang/rust-clippy/pull/4026)
+* Remove [`approx_constant`]'s documentation's "Known problems" section. [#4027](https://github.com/rust-lang/rust-clippy/pull/4027)
+* Fix ICE in [`suspicious_else_formatting`] [#3960](https://github.com/rust-lang/rust-clippy/pull/3960)
+* Fix ICE in [`decimal_literal_representation`] [#3931](https://github.com/rust-lang/rust-clippy/pull/3931)
+
+
+## Rust 1.35
+
+Released 2019-05-20
+
+[1fac380..37f5c1e](https://github.com/rust-lang/rust-clippy/compare/1fac380...37f5c1e)
+
+* New lint: `drop_bounds` to detect `T: Drop` bounds
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Rename `cyclomatic_complexity` to [`cognitive_complexity`], start work on making lint more practical for Rust code
+* Move [`get_unwrap`] to the restriction category
+* Improve suggestions for [`iter_cloned_collect`]
+* Improve suggestions for [`cast_lossless`] to suggest suffixed literals
+* Fix false positives in [`print_with_newline`] and [`write_with_newline`] pertaining to raw strings
+* Fix false positive in [`needless_range_loop`] pertaining to structs without a `.iter()`
+* Fix false positive in [`bool_comparison`] pertaining to non-bool types
+* Fix false positive in [`redundant_closure`] pertaining to differences in borrows
+* Fix false positive in `option_map_unwrap_or` on non-copy types
+* Fix false positives in [`missing_const_for_fn`] pertaining to macros and trait method impls
+* Fix false positive in [`needless_pass_by_value`] pertaining to procedural macros
+* Fix false positive in [`needless_continue`] pertaining to loop labels
+* Fix false positive for [`boxed_local`] pertaining to arguments moved into closures
+* Fix false positive for [`use_self`] in nested functions
+* Fix suggestion for [`expect_fun_call`] (https://github.com/rust-lang/rust-clippy/pull/3846)
+* Fix suggestion for [`explicit_counter_loop`] to deal with parenthesizing range variables
+* Fix suggestion for [`single_char_pattern`] to correctly escape single quotes
+* Avoid triggering [`redundant_closure`] in macros
+* ICE fixes: [#3805](https://github.com/rust-lang/rust-clippy/pull/3805), [#3772](https://github.com/rust-lang/rust-clippy/pull/3772), [#3741](https://github.com/rust-lang/rust-clippy/pull/3741)
+
+## Rust 1.34
+
+Released 2019-04-10
+
+[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/1b89724...1fac380)
+
+* New lint: [`assertions_on_constants`] to detect for example `assert!(true)`
+* New lint: [`dbg_macro`] to detect uses of the `dbg!` macro
+* New lint: [`missing_const_for_fn`] that can suggest functions to be made `const`
+* New lint: [`too_many_lines`] to detect functions with excessive LOC. It can be
+ configured using the `too-many-lines-threshold` configuration.
+* New lint: [`wildcard_enum_match_arm`] to check for wildcard enum matches using `_`
+* Expand `redundant_closure` to also work for methods (not only functions)
+* Fix ICEs in `vec_box`, `needless_pass_by_value` and `implicit_hasher`
+* Fix false positive in `cast_sign_loss`
+* Fix false positive in `integer_arithmetic`
+* Fix false positive in `unit_arg`
+* Fix false positives in `implicit_return`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `cast_lossless`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `needless_bool`
+* Fix incorrect suggestion for `needless_range_loop`
+* Fix incorrect suggestion for `use_self`
+* Fix incorrect suggestion for `while_let_on_iterator`
+* Clippy is now slightly easier to invoke in non-cargo contexts. See
+ [#3665][pull3665] for more details.
+* We now have [improved documentation][adding_lints] on how to add new lints
+
+## Rust 1.33
+
+Released 2019-02-26
+
+[b2601be...1b89724](https://github.com/rust-lang/rust-clippy/compare/b2601be...1b89724)
+
+* New lints: [`implicit_return`], [`vec_box`], [`cast_ref_to_mut`]
+* The `rust-clippy` repository is now part of the `rust-lang` org.
+* Rename `stutter` to `module_name_repetitions`
+* Merge `new_without_default_derive` into `new_without_default` lint
+* Move `large_digit_groups` from `style` group to `pedantic`
+* Expand `bool_comparison` to check for `<`, `<=`, `>`, `>=`, and `!=`
+ comparisons against booleans
+* Expand `no_effect` to detect writes to constants such as `A_CONST.field = 2`
+* Expand `redundant_clone` to work on struct fields
+* Expand `suspicious_else_formatting` to detect `if .. {..} {..}`
+* Expand `use_self` to work on tuple structs and also in local macros
+* Fix ICE in `result_map_unit_fn` and `option_map_unit_fn`
+* Fix false positives in `implicit_return`
+* Fix false positives in `use_self`
+* Fix false negative in `clone_on_copy`
+* Fix false positive in `doc_markdown`
+* Fix false positive in `empty_loop`
+* Fix false positive in `if_same_then_else`
+* Fix false positive in `infinite_iter`
+* Fix false positive in `question_mark`
+* Fix false positive in `useless_asref`
+* Fix false positive in `wildcard_dependencies`
+* Fix false positive in `write_with_newline`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `get_unwrap`
+
+## Rust 1.32
+
+Released 2019-01-17
+
+[2e26fdc2...b2601be](https://github.com/rust-lang/rust-clippy/compare/2e26fdc2...b2601be)
+
+* New lints: [`slow_vector_initialization`], `mem_discriminant_non_enum`,
+ [`redundant_clone`], [`wildcard_dependencies`],
+ [`into_iter_on_ref`], `into_iter_on_array`, [`deprecated_cfg_attr`],
+ [`cargo_common_metadata`]
+* Add support for `u128` and `i128` to integer related lints
+* Add float support to `mistyped_literal_suffixes`
+* Fix false positives in `use_self`
+* Fix false positives in `missing_comma`
+* Fix false positives in `new_ret_no_self`
+* Fix false positives in `possible_missing_comma`
+* Fix false positive in `integer_arithmetic` in constant items
+* Fix false positive in `needless_borrow`
+* Fix false positive in `out_of_bounds_indexing`
+* Fix false positive in `new_without_default_derive`
+* Fix false positive in `string_lit_as_bytes`
+* Fix false negative in `out_of_bounds_indexing`
+* Fix false negative in `use_self`. It will now also check existential types
+* Fix incorrect suggestion for `redundant_closure_call`
+* Fix various suggestions that contained expanded macros
+* Fix `bool_comparison` triggering 3 times on on on the same code
+* Expand `trivially_copy_pass_by_ref` to work on trait methods
+* Improve suggestion for `needless_range_loop`
+* Move `needless_pass_by_value` from `pedantic` group to `style`
+
+## Rust 1.31
+
+Released 2018-12-06
+
+[125907ad..2e26fdc2](https://github.com/rust-lang/rust-clippy/compare/125907ad..2e26fdc2)
+
+* Clippy has been relicensed under a dual MIT / Apache license.
+ See [#3093](https://github.com/rust-lang/rust-clippy/issues/3093) for more
+ information.
+* With Rust 1.31, Clippy is no longer available via crates.io. The recommended
+ installation method is via `rustup component add clippy`.
+* New lints: [`redundant_pattern_matching`], [`unnecessary_filter_map`],
+ [`unused_unit`], [`map_flatten`], [`mem_replace_option_with_none`]
+* Fix ICE in `if_let_redundant_pattern_matching`
+* Fix ICE in `needless_pass_by_value` when encountering a generic function
+ argument with a lifetime parameter
+* Fix ICE in `needless_range_loop`
+* Fix ICE in `single_char_pattern` when encountering a constant value
+* Fix false positive in `assign_op_pattern`
+* Fix false positive in `boxed_local` on trait implementations
+* Fix false positive in `cmp_owned`
+* Fix false positive in `collapsible_if` when conditionals have comments
+* Fix false positive in `double_parens`
+* Fix false positive in `excessive_precision`
+* Fix false positive in `explicit_counter_loop`
+* Fix false positive in `fn_to_numeric_cast_with_truncation`
+* Fix false positive in `map_clone`
+* Fix false positive in `new_ret_no_self`
+* Fix false positive in `new_without_default` when `new` is unsafe
+* Fix false positive in `type_complexity` when using extern types
+* Fix false positive in `useless_format`
+* Fix false positive in `wrong_self_convention`
+* Fix incorrect suggestion for `excessive_precision`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `get_unwrap`
+* Fix incorrect suggestion for `useless_format`
+* `fn_to_numeric_cast_with_truncation` lint can be disabled again
+* Improve suggestions for `manual_memcpy`
+* Improve help message for `needless_lifetimes`
+
+## Rust 1.30
+
+Released 2018-10-25
+
+[14207503...125907ad](https://github.com/rust-lang/rust-clippy/compare/14207503...125907ad)
+
+* Deprecate `assign_ops` lint
+* New lints: [`mistyped_literal_suffixes`], [`ptr_offset_with_cast`],
+ [`needless_collect`], [`copy_iterator`]
+* `cargo clippy -V` now includes the Clippy commit hash of the Rust
+ Clippy component
+* Fix ICE in `implicit_hasher`
+* Fix ICE when encountering `println!("{}" a);`
+* Fix ICE when encountering a macro call in match statements
+* Fix false positive in `default_trait_access`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `similar_names`
+* Fix false positive in `redundant_field_name`
+* Fix false positive in `expect_fun_call`
+* Fix false negative in `identity_conversion`
+* Fix false negative in `explicit_counter_loop`
+* Fix `range_plus_one` suggestion and false negative
+* `print_with_newline` / `write_with_newline`: don't warn about string with several `\n`s in them
+* Fix `useless_attribute` to also whitelist `unused_extern_crates`
+* Fix incorrect suggestion for `single_char_pattern`
+* Improve suggestion for `identity_conversion` lint
+* Move `explicit_iter_loop` and `explicit_into_iter_loop` from `style` group to `pedantic`
+* Move `range_plus_one` and `range_minus_one` from `nursery` group to `complexity`
+* Move `shadow_unrelated` from `restriction` group to `pedantic`
+* Move `indexing_slicing` from `pedantic` group to `restriction`
+
+## Rust 1.29
+
+Released 2018-09-13
+
+[v0.0.212...14207503](https://github.com/rust-lang/rust-clippy/compare/v0.0.212...14207503)
+
+* :tada: :tada: **Rust 1.29 is the first stable Rust that includes a bundled Clippy** :tada:
+ :tada:
+ You can now run `rustup component add clippy-preview` and then `cargo
+ clippy` to run Clippy. This should put an end to the continuous nightly
+ upgrades for Clippy users.
+* Clippy now follows the Rust versioning scheme instead of its own
+* Fix ICE when encountering a `while let (..) = x.iter()` construct
+* Fix false positives in `use_self`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `useless_attribute` lint
+* Fix false positive in `print_literal`
+* Fix `use_self` regressions
+* Improve lint message for `neg_cmp_op_on_partial_ord`
+* Improve suggestion highlight for `single_char_pattern`
+* Improve suggestions for various print/write macro lints
+* Improve website header
+
+## 0.0.212 (2018-07-10)
+* Rustup to *rustc 1.29.0-nightly (e06c87544 2018-07-06)*
+
+## 0.0.211
+* Rustup to *rustc 1.28.0-nightly (e3bf634e0 2018-06-28)*
+
+## 0.0.210
+* Rustup to *rustc 1.28.0-nightly (01cc982e9 2018-06-24)*
+
+## 0.0.209
+* Rustup to *rustc 1.28.0-nightly (523097979 2018-06-18)*
+
+## 0.0.208
+* Rustup to *rustc 1.28.0-nightly (86a8f1a63 2018-06-17)*
+
+## 0.0.207
+* Rustup to *rustc 1.28.0-nightly (2a0062974 2018-06-09)*
+
+## 0.0.206
+* Rustup to *rustc 1.28.0-nightly (5bf68db6e 2018-05-28)*
+
+## 0.0.205
+* Rustup to *rustc 1.28.0-nightly (990d8aa74 2018-05-25)*
+* Rename `unused_lifetimes` to `extra_unused_lifetimes` because of naming conflict with new rustc lint
+
+## 0.0.204
+* Rustup to *rustc 1.28.0-nightly (71e87be38 2018-05-22)*
+
+## 0.0.203
+* Rustup to *rustc 1.28.0-nightly (a3085756e 2018-05-19)*
+* Clippy attributes are now of the form `clippy::cyclomatic_complexity` instead of `clippy(cyclomatic_complexity)`
+
+## 0.0.202
+* Rustup to *rustc 1.28.0-nightly (952f344cd 2018-05-18)*
+
+## 0.0.201
+* Rustup to *rustc 1.27.0-nightly (2f2a11dfc 2018-05-16)*
+
+## 0.0.200
+* Rustup to *rustc 1.27.0-nightly (9fae15374 2018-05-13)*
+
+## 0.0.199
+* Rustup to *rustc 1.27.0-nightly (ff2ac35db 2018-05-12)*
+
+## 0.0.198
+* Rustup to *rustc 1.27.0-nightly (acd3871ba 2018-05-10)*
+
+## 0.0.197
+* Rustup to *rustc 1.27.0-nightly (428ea5f6b 2018-05-06)*
+
+## 0.0.196
+* Rustup to *rustc 1.27.0-nightly (e82261dfb 2018-05-03)*
+
+## 0.0.195
+* Rustup to *rustc 1.27.0-nightly (ac3c2288f 2018-04-18)*
+
+## 0.0.194
+* Rustup to *rustc 1.27.0-nightly (bd40cbbe1 2018-04-14)*
+* New lints: [`cast_ptr_alignment`], [`transmute_ptr_to_ptr`], [`write_literal`], [`write_with_newline`], [`writeln_empty_string`]
+
+## 0.0.193
+* Rustup to *rustc 1.27.0-nightly (eeea94c11 2018-04-06)*
+
+## 0.0.192
+* Rustup to *rustc 1.27.0-nightly (fb44b4c0e 2018-04-04)*
+* New lint: [`print_literal`]
+
+## 0.0.191
+* Rustup to *rustc 1.26.0-nightly (ae544ee1c 2018-03-29)*
+* Lint audit; categorize lints as style, correctness, complexity, pedantic, nursery, restriction.
+
+## 0.0.190
+* Fix a bunch of intermittent cargo bugs
+
+## 0.0.189
+* Rustup to *rustc 1.26.0-nightly (5508b2714 2018-03-18)*
+
+## 0.0.188
+* Rustup to *rustc 1.26.0-nightly (392645394 2018-03-15)*
+* New lint: [`while_immutable_condition`]
+
+## 0.0.187
+* Rustup to *rustc 1.26.0-nightly (322d7f7b9 2018-02-25)*
+* New lints: [`redundant_field_names`], [`suspicious_arithmetic_impl`], [`suspicious_op_assign_impl`]
+
+## 0.0.186
+* Rustup to *rustc 1.25.0-nightly (0c6091fbd 2018-02-04)*
+* Various false positive fixes
+
+## 0.0.185
+* Rustup to *rustc 1.25.0-nightly (56733bc9f 2018-02-01)*
+* New lint: [`question_mark`]
+
+## 0.0.184
+* Rustup to *rustc 1.25.0-nightly (90eb44a58 2018-01-29)*
+* New lints: [`double_comparisons`], [`empty_line_after_outer_attr`]
+
+## 0.0.183
+* Rustup to *rustc 1.25.0-nightly (21882aad7 2018-01-28)*
+* New lint: [`misaligned_transmute`]
+
+## 0.0.182
+* Rustup to *rustc 1.25.0-nightly (a0dcecff9 2018-01-24)*
+* New lint: [`decimal_literal_representation`]
+
+## 0.0.181
+* Rustup to *rustc 1.25.0-nightly (97520ccb1 2018-01-21)*
+* New lints: [`else_if_without_else`], [`option_option`], [`unit_arg`], [`unnecessary_fold`]
+* Removed `unit_expr`
+* Various false positive fixes for [`needless_pass_by_value`]
+
+## 0.0.180
+* Rustup to *rustc 1.25.0-nightly (3f92e8d89 2018-01-14)*
+
+## 0.0.179
+* Rustup to *rustc 1.25.0-nightly (61452e506 2018-01-09)*
+
+## 0.0.178
+* Rustup to *rustc 1.25.0-nightly (ee220daca 2018-01-07)*
+
+## 0.0.177
+* Rustup to *rustc 1.24.0-nightly (250b49205 2017-12-21)*
+* New lint: [`match_as_ref`]
+
+## 0.0.176
+* Rustup to *rustc 1.24.0-nightly (0077d128d 2017-12-14)*
+
+## 0.0.175
+* Rustup to *rustc 1.24.0-nightly (bb42071f6 2017-12-01)*
+
+## 0.0.174
+* Rustup to *rustc 1.23.0-nightly (63739ab7b 2017-11-21)*
+
+## 0.0.173
+* Rustup to *rustc 1.23.0-nightly (33374fa9d 2017-11-20)*
+
+## 0.0.172
+* Rustup to *rustc 1.23.0-nightly (d0f8e2913 2017-11-16)*
+
+## 0.0.171
+* Rustup to *rustc 1.23.0-nightly (ff0f5de3b 2017-11-14)*
+
+## 0.0.170
+* Rustup to *rustc 1.23.0-nightly (d6b06c63a 2017-11-09)*
+
+## 0.0.169
+* Rustup to *rustc 1.23.0-nightly (3b82e4c74 2017-11-05)*
+* New lints: [`just_underscores_and_digits`], `result_map_unwrap_or_else`, [`transmute_bytes_to_str`]
+
+## 0.0.168
+* Rustup to *rustc 1.23.0-nightly (f0fe716db 2017-10-30)*
+
+## 0.0.167
+* Rustup to *rustc 1.23.0-nightly (90ef3372e 2017-10-29)*
+* New lints: `const_static_lifetime`, [`erasing_op`], [`fallible_impl_from`], [`println_empty_string`], [`useless_asref`]
+
+## 0.0.166
+* Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)*
+* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], `invalid_ref`, [`option_map_or_none`],
+ [`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`],
+ [`transmute_int_to_float`]
+
+## 0.0.165
+* Rust upgrade to rustc 1.22.0-nightly (0e6f4cf51 2017-09-27)
+* New lint: [`mut_range_bound`]
+
+## 0.0.164
+* Update to *rustc 1.22.0-nightly (6c476ce46 2017-09-25)*
+* New lint: [`int_plus_one`]
+
+## 0.0.163
+* Update to *rustc 1.22.0-nightly (14039a42a 2017-09-22)*
+
+## 0.0.162
+* Update to *rustc 1.22.0-nightly (0701b37d9 2017-09-18)*
+* New lint: [`chars_last_cmp`]
+* Improved suggestions for [`needless_borrow`], [`ptr_arg`],
+
+## 0.0.161
+* Update to *rustc 1.22.0-nightly (539f2083d 2017-09-13)*
+
+## 0.0.160
+* Update to *rustc 1.22.0-nightly (dd08c3070 2017-09-12)*
+
+## 0.0.159
+* Update to *rustc 1.22.0-nightly (eba374fb2 2017-09-11)*
+* New lint: [`clone_on_ref_ptr`]
+
+## 0.0.158
+* New lint: [`manual_memcpy`]
+* [`cast_lossless`] no longer has redundant parentheses in its suggestions
+* Update to *rustc 1.22.0-nightly (dead08cb3 2017-09-08)*
+
+## 0.0.157 - 2017-09-04
+* Update to *rustc 1.22.0-nightly (981ce7d8d 2017-09-03)*
+* New lint: `unit_expr`
+
+## 0.0.156 - 2017-09-03
+* Update to *rustc 1.22.0-nightly (744dd6c1d 2017-09-02)*
+
+## 0.0.155
+* Update to *rustc 1.21.0-nightly (c11f689d2 2017-08-29)*
+* New lint: [`infinite_iter`], [`maybe_infinite_iter`], [`cast_lossless`]
+
+## 0.0.154
+* Update to *rustc 1.21.0-nightly (2c0558f63 2017-08-24)*
+* Fix [`use_self`] triggering inside derives
+* Add support for linting an entire workspace with `cargo clippy --all`
+* New lint: [`naive_bytecount`]
+
+## 0.0.153
+* Update to *rustc 1.21.0-nightly (8c303ed87 2017-08-20)*
+* New lint: [`use_self`]
+
+## 0.0.152
+* Update to *rustc 1.21.0-nightly (df511d554 2017-08-14)*
+
+## 0.0.151
+* Update to *rustc 1.21.0-nightly (13d94d5fa 2017-08-10)*
+
+## 0.0.150
+* Update to *rustc 1.21.0-nightly (215e0b10e 2017-08-08)*
+
+## 0.0.148
+* Update to *rustc 1.21.0-nightly (37c7d0ebb 2017-07-31)*
+* New lints: [`unreadable_literal`], [`inconsistent_digit_grouping`], [`large_digit_groups`]
+
+## 0.0.147
+* Update to *rustc 1.21.0-nightly (aac223f4f 2017-07-30)*
+
+## 0.0.146
+* Update to *rustc 1.21.0-nightly (52a330969 2017-07-27)*
+* Fixes false positives in `inline_always`
+* Fixes false negatives in `panic_params`
+
+## 0.0.145
+* Update to *rustc 1.20.0-nightly (afe145d22 2017-07-23)*
+
+## 0.0.144
+* Update to *rustc 1.20.0-nightly (086eaa78e 2017-07-15)*
+
+## 0.0.143
+* Update to *rustc 1.20.0-nightly (d84693b93 2017-07-09)*
+* Fix `cargo clippy` crashing on `dylib` projects
+* Fix false positives around `nested_while_let` and `never_loop`
+
+## 0.0.142
+* Update to *rustc 1.20.0-nightly (067971139 2017-07-02)*
+
+## 0.0.141
+* Rewrite of the `doc_markdown` lint.
+* Deprecated [`range_step_by_zero`]
+* New lint: [`iterator_step_by_zero`]
+* New lint: [`needless_borrowed_reference`]
+* Update to *rustc 1.20.0-nightly (69c65d296 2017-06-28)*
+
+## 0.0.140 - 2017-06-16
+* Update to *rustc 1.19.0-nightly (258ae6dd9 2017-06-15)*
+
+## 0.0.139 — 2017-06-10
+* Update to *rustc 1.19.0-nightly (4bf5c99af 2017-06-10)*
+* Fix bugs with for loop desugaring
+* Check for [`AsRef`]/[`AsMut`] arguments in [`wrong_self_convention`]
+
+## 0.0.138 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (0418fa9d3 2017-06-04)*
+
+## 0.0.137 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (6684d176c 2017-06-03)*
+
+## 0.0.136 — 2017—05—26
+* Update to *rustc 1.19.0-nightly (557967766 2017-05-26)*
+
+## 0.0.135 — 2017—05—24
+* Update to *rustc 1.19.0-nightly (5b13bff52 2017-05-23)*
+
+## 0.0.134 — 2017—05—19
+* Update to *rustc 1.19.0-nightly (0ed1ec9f9 2017-05-18)*
+
+## 0.0.133 — 2017—05—14
+* Update to *rustc 1.19.0-nightly (826d8f385 2017-05-13)*
+
+## 0.0.132 — 2017—05—05
+* Fix various bugs and some ices
+
+## 0.0.131 — 2017—05—04
+* Update to *rustc 1.19.0-nightly (2d4ed8e0c 2017-05-03)*
+
+## 0.0.130 — 2017—05—03
+* Update to *rustc 1.19.0-nightly (6a5fc9eec 2017-05-02)*
+
+## 0.0.129 — 2017-05-01
+* Update to *rustc 1.19.0-nightly (06fb4d256 2017-04-30)*
+
+## 0.0.128 — 2017-04-28
+* Update to *rustc 1.18.0-nightly (94e884b63 2017-04-27)*
+
+## 0.0.127 — 2017-04-27
+* Update to *rustc 1.18.0-nightly (036983201 2017-04-26)*
+* New lint: [`needless_continue`]
+
+## 0.0.126 — 2017-04-24
+* Update to *rustc 1.18.0-nightly (2bd4b5c6d 2017-04-23)*
+
+## 0.0.125 — 2017-04-19
+* Update to *rustc 1.18.0-nightly (9f2abadca 2017-04-18)*
+
+## 0.0.124 — 2017-04-16
+* Update to *rustc 1.18.0-nightly (d5cf1cb64 2017-04-15)*
+
+## 0.0.123 — 2017-04-07
+* Fix various false positives
+
+## 0.0.122 — 2017-04-07
+* Rustup to *rustc 1.18.0-nightly (91ae22a01 2017-04-05)*
+* New lint: [`op_ref`]
+
+## 0.0.121 — 2017-03-21
+* Rustup to *rustc 1.17.0-nightly (134c4a0f0 2017-03-20)*
+
+## 0.0.120 — 2017-03-17
+* Rustup to *rustc 1.17.0-nightly (0aeb9c129 2017-03-15)*
+
+## 0.0.119 — 2017-03-13
+* Rustup to *rustc 1.17.0-nightly (824c9ebbd 2017-03-12)*
+
+## 0.0.118 — 2017-03-05
+* Rustup to *rustc 1.17.0-nightly (b1e31766d 2017-03-03)*
+
+## 0.0.117 — 2017-03-01
+* Rustup to *rustc 1.17.0-nightly (be760566c 2017-02-28)*
+
+## 0.0.116 — 2017-02-28
+* Fix `cargo clippy` on 64 bit windows systems
+
+## 0.0.115 — 2017-02-27
+* Rustup to *rustc 1.17.0-nightly (60a0edc6c 2017-02-26)*
+* New lints: [`zero_ptr`], [`never_loop`], [`mut_from_ref`]
+
+## 0.0.114 — 2017-02-08
+* Rustup to *rustc 1.17.0-nightly (c49d10207 2017-02-07)*
+* Tests are now ui tests (testing the exact output of rustc)
+
+## 0.0.113 — 2017-02-04
+* Rustup to *rustc 1.16.0-nightly (eedaa94e3 2017-02-02)*
+* New lint: [`large_enum_variant`]
+* `explicit_into_iter_loop` provides suggestions
+
+## 0.0.112 — 2017-01-27
+* Rustup to *rustc 1.16.0-nightly (df8debf6d 2017-01-25)*
+
+## 0.0.111 — 2017-01-21
+* Rustup to *rustc 1.16.0-nightly (a52da95ce 2017-01-20)*
+
+## 0.0.110 — 2017-01-20
+* Add badges and categories to `Cargo.toml`
+
+## 0.0.109 — 2017-01-19
+* Update to *rustc 1.16.0-nightly (c07a6ae77 2017-01-17)*
+
+## 0.0.108 — 2017-01-12
+* Update to *rustc 1.16.0-nightly (2782e8f8f 2017-01-12)*
+
+## 0.0.107 — 2017-01-11
+* Update regex dependency
+* Fix FP when matching `&&mut` by `&ref`
+* Reintroduce `for (_, x) in &mut hash_map` -> `for x in hash_map.values_mut()`
+* New lints: [`unused_io_amount`], [`forget_ref`], [`short_circuit_statement`]
+
+## 0.0.106 — 2017-01-04
+* Fix FP introduced by rustup in [`wrong_self_convention`]
+
+## 0.0.105 — 2017-01-04
+* Update to *rustc 1.16.0-nightly (468227129 2017-01-03)*
+* New lints: [`deref_addrof`], [`double_parens`], [`pub_enum_variant_names`]
+* Fix suggestion in [`new_without_default`]
+* FP fix in [`absurd_extreme_comparisons`]
+
+## 0.0.104 — 2016-12-15
+* Update to *rustc 1.15.0-nightly (8f02c429a 2016-12-15)*
+
+## 0.0.103 — 2016-11-25
+* Update to *rustc 1.15.0-nightly (d5814b03e 2016-11-23)*
+
+## 0.0.102 — 2016-11-24
+* Update to *rustc 1.15.0-nightly (3bf2be9ce 2016-11-22)*
+
+## 0.0.101 — 2016-11-23
+* Update to *rustc 1.15.0-nightly (7b3eeea22 2016-11-21)*
+* New lint: [`string_extend_chars`]
+
+## 0.0.100 — 2016-11-20
+* Update to *rustc 1.15.0-nightly (ac635aa95 2016-11-18)*
+
+## 0.0.99 — 2016-11-18
+* Update to rustc 1.15.0-nightly (0ed951993 2016-11-14)
+* New lint: [`get_unwrap`]
+
+## 0.0.98 — 2016-11-08
+* Fixes an issue due to a change in how cargo handles `--sysroot`, which broke `cargo clippy`
+
+## 0.0.97 — 2016-11-03
+* For convenience, `cargo clippy` defines a `cargo-clippy` feature. This was
+ previously added for a short time under the name `clippy` but removed for
+ compatibility.
+* `cargo clippy --help` is more helping (and less helpful :smile:)
+* Rustup to *rustc 1.14.0-nightly (5665bdf3e 2016-11-02)*
+* New lints: [`if_let_redundant_pattern_matching`], [`partialeq_ne_impl`]
+
+## 0.0.96 — 2016-10-22
+* Rustup to *rustc 1.14.0-nightly (f09420685 2016-10-20)*
+* New lint: [`iter_skip_next`]
+
+## 0.0.95 — 2016-10-06
+* Rustup to *rustc 1.14.0-nightly (3210fd5c2 2016-10-05)*
+
+## 0.0.94 — 2016-10-04
+* Fixes bustage on Windows due to forbidden directory name
+
+## 0.0.93 — 2016-10-03
+* Rustup to *rustc 1.14.0-nightly (144af3e97 2016-10-02)*
+* `option_map_unwrap_or` and `option_map_unwrap_or_else` are now
+ allowed by default.
+* New lint: [`explicit_into_iter_loop`]
+
+## 0.0.92 — 2016-09-30
+* Rustup to *rustc 1.14.0-nightly (289f3a4ca 2016-09-29)*
+
+## 0.0.91 — 2016-09-28
+* Rustup to *rustc 1.13.0-nightly (d0623cf7b 2016-09-26)*
+
+## 0.0.90 — 2016-09-09
+* Rustup to *rustc 1.13.0-nightly (f1f40f850 2016-09-09)*
+
+## 0.0.89 — 2016-09-06
+* Rustup to *rustc 1.13.0-nightly (cbe4de78e 2016-09-05)*
+
+## 0.0.88 — 2016-09-04
+* Rustup to *rustc 1.13.0-nightly (70598e04f 2016-09-03)*
+* The following lints are not new but were only usable through the `clippy`
+ lint groups: [`filter_next`], `for_loop_over_option`,
+ `for_loop_over_result` and [`match_overlapping_arm`]. You should now be
+ able to `#[allow/deny]` them individually and they are available directly
+ through `cargo clippy`.
+
+## 0.0.87 — 2016-08-31
+* Rustup to *rustc 1.13.0-nightly (eac41469d 2016-08-30)*
+* New lints: [`builtin_type_shadow`]
+* Fix FP in [`zero_prefixed_literal`] and `0b`/`0o`
+
+## 0.0.86 — 2016-08-28
+* Rustup to *rustc 1.13.0-nightly (a23064af5 2016-08-27)*
+* New lints: [`missing_docs_in_private_items`], [`zero_prefixed_literal`]
+
+## 0.0.85 — 2016-08-19
+* Fix ICE with [`useless_attribute`]
+* [`useless_attribute`] ignores `unused_imports` on `use` statements
+
+## 0.0.84 — 2016-08-18
+* Rustup to *rustc 1.13.0-nightly (aef6971ca 2016-08-17)*
+
+## 0.0.83 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (1bf5fa326 2016-08-16)*
+* New lints: [`print_with_newline`], [`useless_attribute`]
+
+## 0.0.82 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (197be89f3 2016-08-15)*
+* New lint: [`module_inception`]
+
+## 0.0.81 — 2016-08-14
+* Rustup to *rustc 1.12.0-nightly (1deb02ea6 2016-08-12)*
+* New lints: [`eval_order_dependence`], [`mixed_case_hex_literals`], [`unseparated_literal_suffix`]
+* False positive fix in [`too_many_arguments`]
+* Addition of functionality to [`needless_borrow`]
+* Suggestions for [`clone_on_copy`]
+* Bug fix in [`wrong_self_convention`]
+* Doc improvements
+
+## 0.0.80 — 2016-07-31
+* Rustup to *rustc 1.12.0-nightly (1225e122f 2016-07-30)*
+* New lints: [`misrefactored_assign_op`], [`serde_api_misuse`]
+
+## 0.0.79 — 2016-07-10
+* Rustup to *rustc 1.12.0-nightly (f93aaf84c 2016-07-09)*
+* Major suggestions refactoring
+
+## 0.0.78 — 2016-07-02
+* Rustup to *rustc 1.11.0-nightly (01411937f 2016-07-01)*
+* New lints: [`wrong_transmute`], [`double_neg`], [`filter_map`]
+* For compatibility, `cargo clippy` does not defines the `clippy` feature
+ introduced in 0.0.76 anymore
+* [`collapsible_if`] now considers `if let`
+
+## 0.0.77 — 2016-06-21
+* Rustup to *rustc 1.11.0-nightly (5522e678b 2016-06-20)*
+* New lints: `stutter` and [`iter_nth`]
+
+## 0.0.76 — 2016-06-10
+* Rustup to *rustc 1.11.0-nightly (7d2f75a95 2016-06-09)*
+* `cargo clippy` now automatically defines the `clippy` feature
+* New lint: [`not_unsafe_ptr_arg_deref`]
+
+## 0.0.75 — 2016-06-08
+* Rustup to *rustc 1.11.0-nightly (763f9234b 2016-06-06)*
+
+## 0.0.74 — 2016-06-07
+* Fix bug with `cargo-clippy` JSON parsing
+* Add the `CLIPPY_DISABLE_DOCS_LINKS` environment variable to deactivate the
+ “for further information visit *lint-link*” message.
+
+## 0.0.73 — 2016-06-05
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.72 — 2016-06-04
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.71 — 2016-05-31
+* Rustup to *rustc 1.11.0-nightly (a967611d8 2016-05-30)*
+* New lint: [`useless_let_if_seq`]
+
+## 0.0.70 — 2016-05-28
+* Rustup to *rustc 1.10.0-nightly (7bddce693 2016-05-27)*
+* [`invalid_regex`] and [`trivial_regex`] can now warn on `RegexSet::new`,
+ `RegexBuilder::new` and byte regexes
+
+## 0.0.69 — 2016-05-20
+* Rustup to *rustc 1.10.0-nightly (476fe6eef 2016-05-21)*
+* [`used_underscore_binding`] has been made `Allow` temporarily
+
+## 0.0.68 — 2016-05-17
+* Rustup to *rustc 1.10.0-nightly (cd6a40017 2016-05-16)*
+* New lint: [`unnecessary_operation`]
+
+## 0.0.67 — 2016-05-12
+* Rustup to *rustc 1.10.0-nightly (22ac88f1a 2016-05-11)*
+
+## 0.0.66 — 2016-05-11
+* New `cargo clippy` subcommand
+* New lints: [`assign_op_pattern`], [`assign_ops`], [`needless_borrow`]
+
+## 0.0.65 — 2016-05-08
+* Rustup to *rustc 1.10.0-nightly (62e2b2fb7 2016-05-06)*
+* New lints: [`float_arithmetic`], [`integer_arithmetic`]
+
+## 0.0.64 — 2016-04-26
+* Rustup to *rustc 1.10.0-nightly (645dd013a 2016-04-24)*
+* New lints: `temporary_cstring_as_ptr`, [`unsafe_removed_from_name`], and [`mem_forget`]
+
+## 0.0.63 — 2016-04-08
+* Rustup to *rustc 1.9.0-nightly (7979dd608 2016-04-07)*
+
+## 0.0.62 — 2016-04-07
+* Rustup to *rustc 1.9.0-nightly (bf5da36f1 2016-04-06)*
+
+## 0.0.61 — 2016-04-03
+* Rustup to *rustc 1.9.0-nightly (5ab11d72c 2016-04-02)*
+* New lint: [`invalid_upcast_comparisons`]
+
+## 0.0.60 — 2016-04-01
+* Rustup to *rustc 1.9.0-nightly (e1195c24b 2016-03-31)*
+
+## 0.0.59 — 2016-03-31
+* Rustup to *rustc 1.9.0-nightly (30a3849f2 2016-03-30)*
+* New lints: [`logic_bug`], [`nonminimal_bool`]
+* Fixed: [`match_same_arms`] now ignores arms with guards
+* Improved: [`useless_vec`] now warns on `for … in vec![…]`
+
+## 0.0.58 — 2016-03-27
+* Rustup to *rustc 1.9.0-nightly (d5a91e695 2016-03-26)*
+* New lint: [`doc_markdown`]
+
+## 0.0.57 — 2016-03-27
+* Update to *rustc 1.9.0-nightly (a1e29daf1 2016-03-25)*
+* Deprecated lints: [`str_to_string`], [`string_to_string`], [`unstable_as_slice`], [`unstable_as_mut_slice`]
+* New lint: [`crosspointer_transmute`]
+
+## 0.0.56 — 2016-03-23
+* Update to *rustc 1.9.0-nightly (0dcc413e4 2016-03-22)*
+* New lints: [`many_single_char_names`] and [`similar_names`]
+
+## 0.0.55 — 2016-03-21
+* Update to *rustc 1.9.0-nightly (02310fd31 2016-03-19)*
+
+## 0.0.54 — 2016-03-16
+* Update to *rustc 1.9.0-nightly (c66d2380a 2016-03-15)*
+
+## 0.0.53 — 2016-03-15
+* Add a [configuration file]
+
+## ~~0.0.52~~
+
+## 0.0.51 — 2016-03-13
+* Add `str` to types considered by [`len_zero`]
+* New lints: [`indexing_slicing`]
+
+## 0.0.50 — 2016-03-11
+* Update to *rustc 1.9.0-nightly (c9629d61c 2016-03-10)*
+
+## 0.0.49 — 2016-03-09
+* Update to *rustc 1.9.0-nightly (eabfc160f 2016-03-08)*
+* New lints: [`overflow_check_conditional`], `unused_label`, [`new_without_default`]
+
+## 0.0.48 — 2016-03-07
+* Fixed: ICE in [`needless_range_loop`] with globals
+
+## 0.0.47 — 2016-03-07
+* Update to *rustc 1.9.0-nightly (998a6720b 2016-03-07)*
+* New lint: [`redundant_closure_call`]
+
+[`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
+[`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
+[configuration file]: ./rust-clippy#configuration
+[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
+[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/adding_lints.md
+[`README.md`]: https://github.com/rust-lang/rust-clippy/blob/master/README.md
+
+<!-- lint disable no-unused-definitions -->
+<!-- begin autogenerated links to lint list -->
+[`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons
+[`alloc_instead_of_core`]: https://rust-lang.github.io/rust-clippy/master/index.html#alloc_instead_of_core
+[`allow_attributes_without_reason`]: https://rust-lang.github.io/rust-clippy/master/index.html#allow_attributes_without_reason
+[`almost_complete_letter_range`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_complete_letter_range
+[`almost_swapped`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_swapped
+[`approx_constant`]: https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
++[`arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#arithmetic
+[`as_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_conversions
+[`as_underscore`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_underscore
+[`assertions_on_constants`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_constants
++[`assertions_on_result_states`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states
+[`assign_op_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
+[`assign_ops`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_ops
+[`async_yields_async`]: https://rust-lang.github.io/rust-clippy/master/index.html#async_yields_async
+[`await_holding_invalid_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_invalid_type
+[`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock
+[`await_holding_refcell_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_refcell_ref
+[`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask
+[`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map
+[`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name
+[`blanket_clippy_restriction_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#blanket_clippy_restriction_lints
+[`block_in_if_condition_expr`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_expr
+[`block_in_if_condition_stmt`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_stmt
+[`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions
+[`bool_assert_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_assert_comparison
+[`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
+[`borrow_as_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_as_ptr
+[`borrow_deref_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_deref_ref
+[`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const
+[`borrowed_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
+[`box_collection`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_collection
+[`box_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_vec
+[`boxed_local`]: https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
+[`branches_sharing_code`]: https://rust-lang.github.io/rust-clippy/master/index.html#branches_sharing_code
+[`builtin_type_shadow`]: https://rust-lang.github.io/rust-clippy/master/index.html#builtin_type_shadow
+[`bytes_count_to_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_count_to_len
+[`bytes_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#bytes_nth
+[`cargo_common_metadata`]: https://rust-lang.github.io/rust-clippy/master/index.html#cargo_common_metadata
+[`case_sensitive_file_extension_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#case_sensitive_file_extension_comparisons
+[`cast_abs_to_unsigned`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_abs_to_unsigned
+[`cast_enum_constructor`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_constructor
+[`cast_enum_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_enum_truncation
+[`cast_lossless`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
+[`cast_possible_truncation`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_truncation
+[`cast_possible_wrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_possible_wrap
+[`cast_precision_loss`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_precision_loss
+[`cast_ptr_alignment`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_ptr_alignment
+[`cast_ref_to_mut`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_ref_to_mut
+[`cast_sign_loss`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_sign_loss
+[`cast_slice_different_sizes`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_different_sizes
+[`char_lit_as_u8`]: https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
+[`chars_last_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_last_cmp
+[`chars_next_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_next_cmp
+[`checked_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#checked_conversions
+[`clone_double_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
+[`clone_on_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
+[`clone_on_ref_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_ref_ptr
+[`cloned_instead_of_copied`]: https://rust-lang.github.io/rust-clippy/master/index.html#cloned_instead_of_copied
+[`cmp_nan`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_nan
+[`cmp_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_null
+[`cmp_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
+[`cognitive_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cognitive_complexity
+[`collapsible_else_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_else_if
+[`collapsible_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
+[`collapsible_match`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
+[`comparison_chain`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_chain
+[`comparison_to_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_to_empty
+[`const_static_lifetime`]: https://rust-lang.github.io/rust-clippy/master/index.html#const_static_lifetime
+[`copy_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#copy_iterator
+[`crate_in_macro_def`]: https://rust-lang.github.io/rust-clippy/master/index.html#crate_in_macro_def
+[`create_dir`]: https://rust-lang.github.io/rust-clippy/master/index.html#create_dir
+[`crosspointer_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#crosspointer_transmute
+[`cyclomatic_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
+[`dbg_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#dbg_macro
+[`debug_assert_with_mut_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#debug_assert_with_mut_call
+[`decimal_literal_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#decimal_literal_representation
+[`declare_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#declare_interior_mutable_const
+[`default_instead_of_iter_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_instead_of_iter_empty
+[`default_numeric_fallback`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_numeric_fallback
+[`default_trait_access`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_trait_access
+[`default_union_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_union_representation
+[`deprecated_cfg_attr`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_cfg_attr
+[`deprecated_semver`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_semver
+[`deref_addrof`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
+[`deref_by_slicing`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_by_slicing
+[`derivable_impls`]: https://rust-lang.github.io/rust-clippy/master/index.html#derivable_impls
+[`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
+[`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord
+[`derive_partial_eq_without_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq
+[`disallowed_method`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_method
+[`disallowed_methods`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_methods
+[`disallowed_script_idents`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_script_idents
+[`disallowed_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_type
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+[`todo`]: https://rust-lang.github.io/rust-clippy/master/index.html#todo
+[`too_many_arguments`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
+[`too_many_lines`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_lines
+[`toplevel_ref_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
+[`trailing_empty_array`]: https://rust-lang.github.io/rust-clippy/master/index.html#trailing_empty_array
+[`trait_duplication_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds
+[`transmute_bytes_to_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_bytes_to_str
+[`transmute_float_to_int`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_float_to_int
+[`transmute_int_to_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_bool
+[`transmute_int_to_char`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_char
+[`transmute_int_to_float`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_float
+[`transmute_num_to_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_num_to_bytes
+[`transmute_ptr_to_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ptr
+[`transmute_ptr_to_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
+[`transmute_undefined_repr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_undefined_repr
+[`transmutes_expressible_as_ptr_casts`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmutes_expressible_as_ptr_casts
+[`transmuting_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmuting_null
+[`trim_split_whitespace`]: https://rust-lang.github.io/rust-clippy/master/index.html#trim_split_whitespace
+[`trivial_regex`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
+[`trivially_copy_pass_by_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
+[`try_err`]: https://rust-lang.github.io/rust-clippy/master/index.html#try_err
+[`type_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
+[`type_repetition_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_repetition_in_bounds
+[`undocumented_unsafe_blocks`]: https://rust-lang.github.io/rust-clippy/master/index.html#undocumented_unsafe_blocks
+[`undropped_manually_drops`]: https://rust-lang.github.io/rust-clippy/master/index.html#undropped_manually_drops
+[`unicode_not_nfc`]: https://rust-lang.github.io/rust-clippy/master/index.html#unicode_not_nfc
+[`unimplemented`]: https://rust-lang.github.io/rust-clippy/master/index.html#unimplemented
+[`uninit_assumed_init`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
+[`uninit_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_vec
+[`unit_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
+[`unit_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_cmp
+[`unit_hash`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_hash
+[`unit_return_expecting_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_return_expecting_ord
+[`unknown_clippy_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#unknown_clippy_lints
+[`unnecessary_cast`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
+[`unnecessary_filter_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
+[`unnecessary_find_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_find_map
+[`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
+[`unnecessary_join`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_join
+[`unnecessary_lazy_evaluations`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_lazy_evaluations
+[`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
+[`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation
+[`unnecessary_owned_empty_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_owned_empty_strings
+[`unnecessary_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_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_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
+[package]
+name = "clippy"
+version = "0.1.64"
+description = "A bunch of helpful lints to avoid common pitfalls in Rust"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["clippy", "lint", "plugin"]
+categories = ["development-tools", "development-tools::cargo-plugins"]
+build = "build.rs"
+edition = "2021"
+publish = false
+
+[[bin]]
+name = "cargo-clippy"
+test = false
+path = "src/main.rs"
+
+[[bin]]
+name = "clippy-driver"
+path = "src/driver.rs"
+
+[dependencies]
+clippy_lints = { path = "clippy_lints" }
+semver = "1.0"
+rustc_tools_util = { path = "rustc_tools_util" }
+tempfile = { version = "3.2", optional = true }
+termize = "0.1"
+
+[dev-dependencies]
+compiletest_rs = { version = "0.8", features = ["tmp"] }
+tester = "0.9"
+regex = "1.5"
+toml = "0.5"
++walkdir = "2.3"
+# This is used by the `collect-metadata` alias.
+filetime = "0.2"
+
+# A noop dependency that changes in the Rust repository, it's a bit of a hack.
+# See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`
+# for more information.
+rustc-workspace-hack = "1.0"
+
+# UI test dependencies
+clippy_utils = { path = "clippy_utils" }
+derive-new = "0.5"
+if_chain = "1.0"
+itertools = "0.10.1"
+quote = "1.0"
+serde = { version = "1.0.125", features = ["derive"] }
+syn = { version = "1.0", features = ["full"] }
+futures = "0.3"
+parking_lot = "0.12"
+tokio = { version = "1", features = ["io-util"] }
+rustc-semver = "1.1"
+
+[build-dependencies]
+rustc_tools_util = { version = "0.2", path = "rustc_tools_util" }
+
+[features]
+deny-warnings = ["clippy_lints/deny-warnings"]
+integration = ["tempfile"]
+internal = ["clippy_lints/internal", "tempfile"]
+
+[package.metadata.rust-analyzer]
+# This package uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
- On the GitHub hosted runners, Clippy from the latest stable Rust version comes
- pre-installed. So all you have to do is to run `cargo clippy`.
+# GitHub Actions
+
- - uses: actions/checkout@v1
++GitHub hosted runners using the latest stable version of Rust have Clippy pre-installed.
++It is as simple as running `cargo clippy` to run lints against the codebase.
+
+```yml
+on: push
+name: Clippy check
+
+# Make sure CI fails on all warnings, including Clippy lints
+env:
+ RUSTFLAGS: "-Dwarnings"
+
+jobs:
+ clippy_check:
+ runs-on: ubuntu-latest
+ steps:
++ - uses: actions/checkout@v3
+ - name: Run Clippy
+ run: cargo clippy --all-targets --all-features
+```
--- /dev/null
- lint. Fortunately, you can use the clippy dev tools to handle this for you. We
+# Adding a new lint
+
+You are probably here because you want to add a new lint to Clippy. If this is
+the first time you're contributing to Clippy, this document guides you through
+creating an example lint from scratch.
+
+To get started, we will create a lint that detects functions called `foo`,
+because that's clearly a non-descriptive name.
+
+- [Adding a new lint](#adding-a-new-lint)
+ - [Setup](#setup)
+ - [Getting Started](#getting-started)
++ - [Defining Our Lint](#defining-our-lint)
++ - [Standalone](#standalone)
++ - [Specific Type](#specific-type)
++ - [Tests Location](#tests-location)
+ - [Testing](#testing)
+ - [Cargo lints](#cargo-lints)
+ - [Rustfix tests](#rustfix-tests)
+ - [Testing manually](#testing-manually)
+ - [Lint declaration](#lint-declaration)
+ - [Lint registration](#lint-registration)
+ - [Lint passes](#lint-passes)
+ - [Emitting a lint](#emitting-a-lint)
+ - [Adding the lint logic](#adding-the-lint-logic)
+ - [Specifying the lint's minimum supported Rust version (MSRV)](#specifying-the-lints-minimum-supported-rust-version-msrv)
+ - [Author lint](#author-lint)
+ - [Print HIR lint](#print-hir-lint)
+ - [Documentation](#documentation)
+ - [Running rustfmt](#running-rustfmt)
+ - [Debugging](#debugging)
+ - [PR Checklist](#pr-checklist)
+ - [Adding configuration to a lint](#adding-configuration-to-a-lint)
+ - [Cheat Sheet](#cheat-sheet)
+
+## Setup
+
+See the [Basics](basics.md#get-the-code) documentation.
+
+## Getting Started
+
+There is a bit of boilerplate code that needs to be set up when creating a new
- case), and we don't need type information so it will have an early pass type
- (more on this later on). If you're not sure if the name you chose fits the lint,
- take a look at our [lint naming guidelines][lint_naming]. To get started on this
- lint you can run `cargo dev new_lint --name=foo_functions --pass=early
- --category=pedantic` (category will default to nursery if not provided). This
- command will create two files: `tests/ui/foo_functions.rs` and
- `clippy_lints/src/foo_functions.rs`, as well as [registering the
- lint](#lint-registration). For cargo lints, two project hierarchies (fail/pass)
- will be created by default under `tests/ui-cargo`.
++lint. Fortunately, you can use the Clippy dev tools to handle this for you. We
+are naming our new lint `foo_functions` (lints are generally written in snake
++case), and we don't need type information, so it will have an early pass type
++(more on this later). If you're unsure if the name you chose fits the lint,
++take a look at our [lint naming guidelines][lint_naming].
++
++## Defining Our Lint
++To get started, there are two ways to define our lint.
++
++### Standalone
++Command: `cargo dev new_lint --name=foo_functions --pass=early --category=pedantic`
++(category will default to nursery if not provided)
++
++This command will create a new file: `clippy_lints/src/foo_functions.rs`, as well
++as [register the lint](#lint-registration).
++
++### Specific Type
++Command: `cargo dev new_lint --name=foo_functions --type=functions --category=pedantic`
++
++This command will create a new file: `clippy_lints/src/{type}/foo_functions.rs`.
++
++Notice how this command has a `--type` flag instead of `--pass`. Unlike a standalone
++definition, this lint won't be registered in the traditional sense. Instead, you will
++call your lint from within the type's lint pass, found in `clippy_lints/src/{type}/mod.rs`.
++
++A "type" is just the name of a directory in `clippy_lints/src`, like `functions` in
++the example command. These are groupings of lints with common behaviors, so if your
++lint falls into one, it would be best to add it to that type.
++
++### Tests Location
++Both commands will create a file: `tests/ui/foo_functions.rs`. For cargo lints,
++two project hierarchies (fail/pass) will be created by default under `tests/ui-cargo`.
+
+Next, we'll open up these files and add our lint!
+
+## Testing
+
+Let's write some tests first that we can execute while we iterate on our lint.
+
+Clippy uses UI tests for testing. UI tests check that the output of Clippy is
+exactly as expected. Each test is just a plain Rust file that contains the code
+we want to check. The output of Clippy is compared against a `.stderr` file.
+Note that you don't have to create this file yourself, we'll get to generating
+the `.stderr` files further down.
+
+We start by opening the test file created at `tests/ui/foo_functions.rs`.
+
+Update the file with some examples to get started:
+
+```rust
+#![warn(clippy::foo_functions)]
+
+// Impl methods
+struct A;
+impl A {
+ pub fn fo(&self) {}
+ pub fn foo(&self) {}
+ pub fn food(&self) {}
+}
+
+// Default trait methods
+trait B {
+ fn fo(&self) {}
+ fn foo(&self) {}
+ fn food(&self) {}
+}
+
+// Plain functions
+fn fo() {}
+fn foo() {}
+fn food() {}
+
+fn main() {
+ // We also don't want to lint method calls
+ foo();
+ let a = A;
+ a.foo();
+}
+```
+
+Now we can run the test with `TESTNAME=foo_functions cargo uitest`, currently
+this test is meaningless though.
+
+While we are working on implementing our lint, we can keep running the UI test.
+That allows us to check if the output is turning into what we want.
+
+Once we are satisfied with the output, we need to run `cargo dev bless` to
+update the `.stderr` file for our lint. Please note that, we should run
+`TESTNAME=foo_functions cargo uitest` every time before running `cargo dev
+bless`. Running `TESTNAME=foo_functions cargo uitest` should pass then. When we
+commit our lint, we need to commit the generated `.stderr` files, too. In
+general, you should only commit files changed by `cargo dev bless` for the
+specific lint you are creating/editing. Note that if the generated files are
+empty, they should be removed.
+
+> _Note:_ you can run multiple test files by specifying a comma separated list:
+> `TESTNAME=foo_functions,test2,test3`.
+
+### Cargo lints
+
+For cargo lints, the process of testing differs in that we are interested in the
+`Cargo.toml` manifest file. We also need a minimal crate associated with that
+manifest.
+
+If our new lint is named e.g. `foo_categories`, after running `cargo dev
+new_lint` we will find by default two new crates, each with its manifest file:
+
+* `tests/ui-cargo/foo_categories/fail/Cargo.toml`: this file should cause the
+ new lint to raise an error.
+* `tests/ui-cargo/foo_categories/pass/Cargo.toml`: this file should not trigger
+ the lint.
+
+If you need more cases, you can copy one of those crates (under
+`foo_categories`) and rename it.
+
+The process of generating the `.stderr` file is the same, and prepending the
+`TESTNAME` variable to `cargo uitest` works too.
+
+## Rustfix tests
+
+If the lint you are working on is making use of structured suggestions, the test
+file should include a `// run-rustfix` comment at the top. This will
+additionally run [rustfix] for that test. Rustfix will apply the suggestions
+from the lint to the code of the test file and compare that to the contents of a
+`.fixed` file.
+
+Use `cargo dev bless` to automatically generate the `.fixed` file after running
+the tests.
+
+[rustfix]: https://github.com/rust-lang/rustfix
+
+## Testing manually
+
+Manually testing against an example file can be useful if you have added some
+`println!`s and the test suite output becomes unreadable. To try Clippy with
+your local modifications, run
+
+```
+cargo dev lint input.rs
+```
+
+from the working copy root. With tests in place, let's have a look at
+implementing our lint now.
+
+## Lint declaration
+
+Let's start by opening the new file created in the `clippy_lints` crate at
+`clippy_lints/src/foo_functions.rs`. That's the crate where all the lint code
+is. This file has already imported some initial things we will need:
+
+```rust
+use rustc_lint::{EarlyLintPass, EarlyContext};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_ast::ast::*;
+```
+
+The next step is to update the lint declaration. Lints are declared using the
+[`declare_clippy_lint!`][declare_clippy_lint] macro, and we just need to update
+the auto-generated lint declaration to have a real description, something like
+this:
+
+```rust
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// ### Why is this bad?
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code
+ /// ```
+ #[clippy::version = "1.29.0"]
+ pub FOO_FUNCTIONS,
+ pedantic,
+ "function named `foo`, which is not a descriptive name"
+}
+```
+
+* The section of lines prefixed with `///` constitutes the lint documentation
+ section. This is the default documentation style and will be displayed [like
+ this][example_lint_page]. To render and open this documentation locally in a
+ browser, run `cargo dev serve`.
+* The `#[clippy::version]` attribute will be rendered as part of the lint
+ documentation. The value should be set to the current Rust version that the
+ lint is developed in, it can be retrieved by running `rustc -vV` in the
+ rust-clippy directory. The version is listed under *release*. (Use the version
+ without the `-nightly`) suffix.
+* `FOO_FUNCTIONS` is the name of our lint. Be sure to follow the [lint naming
+ guidelines][lint_naming] here when naming your lint. In short, the name should
+ state the thing that is being checked for and read well when used with
+ `allow`/`warn`/`deny`.
+* `pedantic` sets the lint level to `Allow`. The exact mapping can be found
+ [here][category_level_mapping]
+* The last part should be a text that explains what exactly is wrong with the
+ code
+
+The rest of this file contains an empty implementation for our lint pass, which
+in this case is `EarlyLintPass` and should look like this:
+
+```rust
+// clippy_lints/src/foo_functions.rs
+
+// .. imports and lint declaration ..
+
+declare_lint_pass!(FooFunctions => [FOO_FUNCTIONS]);
+
+impl EarlyLintPass for FooFunctions {}
+```
+
+[declare_clippy_lint]: https://github.com/rust-lang/rust-clippy/blob/557f6848bd5b7183f55c1e1522a326e9e1df6030/clippy_lints/src/lib.rs#L60
+[example_lint_page]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
+[lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
+[category_level_mapping]: https://github.com/rust-lang/rust-clippy/blob/557f6848bd5b7183f55c1e1522a326e9e1df6030/clippy_lints/src/lib.rs#L110
+
+## Lint registration
+
+When using `cargo dev new_lint`, the lint is automatically registered and
+nothing more has to be done.
+
+When declaring a new lint by hand and `cargo dev update_lints` is used, the lint
+pass may have to be registered manually in the `register_plugins` function in
+`clippy_lints/src/lib.rs`:
+
+```rust
+store.register_early_pass(|| Box::new(foo_functions::FooFunctions));
+```
+
+As one may expect, there is a corresponding `register_late_pass` method
+available as well. Without a call to one of `register_early_pass` or
+`register_late_pass`, the lint pass in question will not be run.
+
+One reason that `cargo dev update_lints` does not automate this step is that
+multiple lints can use the same lint pass, so registering the lint pass may
+already be done when adding a new lint. Another reason that this step is not
+automated is that the order that the passes are registered determines the order
+the passes actually run, which in turn affects the order that any emitted lints
+are output in.
+
+## Lint passes
+
+Writing a lint that only checks for the name of a function means that we only
+have to deal with the AST and don't have to deal with the type system at all.
+This is good, because it makes writing this particular lint less complicated.
+
+We have to make this decision with every new Clippy lint. It boils down to using
+either [`EarlyLintPass`][early_lint_pass] or [`LateLintPass`][late_lint_pass].
+
+In short, the `LateLintPass` has access to type information while the
+`EarlyLintPass` doesn't. If you don't need access to type information, use the
+`EarlyLintPass`. The `EarlyLintPass` is also faster. However linting speed
+hasn't really been a concern with Clippy so far.
+
+Since we don't need type information for checking the function name, we used
+`--pass=early` when running the new lint automation and all the imports were
+added accordingly.
+
+[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
+[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
+
+## Emitting a lint
+
+With UI tests and the lint declaration in place, we can start working on the
+implementation of the lint logic.
+
+Let's start by implementing the `EarlyLintPass` for our `FooFunctions`:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ // TODO: Emit lint here
+ }
+}
+```
+
+We implement the [`check_fn`][check_fn] method from the
+[`EarlyLintPass`][early_lint_pass] trait. This gives us access to various
+information about the function that is currently being checked. More on that in
+the next section. Let's worry about the details later and emit our lint for
+*every* function definition first.
+
+Depending on how complex we want our lint message to be, we can choose from a
+variety of lint emission functions. They can all be found in
+[`clippy_utils/src/diagnostics.rs`][diagnostics].
+
+`span_lint_and_help` seems most appropriate in this case. It allows us to
+provide an extra help message and we can't really suggest a better name
+automatically. This is how it looks:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ span_lint_and_help(
+ cx,
+ FOO_FUNCTIONS,
+ span,
+ "function named `foo`",
+ None,
+ "consider using a more meaningful name"
+ );
+ }
+}
+```
+
+Running our UI test should now produce output that contains the lint message.
+
+According to [the rustc-dev-guide], the text should be matter of fact and avoid
+capitalization and periods, unless multiple sentences are needed. When code or
+an identifier must appear in a message or label, it should be surrounded with
+single grave accents \`.
+
+[check_fn]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html#method.check_fn
+[diagnostics]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_utils/src/diagnostics.rs
+[the rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/diagnostics.html
+
+## Adding the lint logic
+
+Writing the logic for your lint will most likely be different from our example,
+so this section is kept rather short.
+
+Using the [`check_fn`][check_fn] method gives us access to [`FnKind`][fn_kind]
+that has the [`FnKind::Fn`] variant. It provides access to the name of the
+function/method via an [`Ident`][ident].
+
+With that we can expand our `check_fn` method to:
+
+```rust
+impl EarlyLintPass for FooFunctions {
+ fn check_fn(&mut self, cx: &EarlyContext<'_>, fn_kind: FnKind<'_>, span: Span, _: NodeId) {
+ if is_foo_fn(fn_kind) {
+ span_lint_and_help(
+ cx,
+ FOO_FUNCTIONS,
+ span,
+ "function named `foo`",
+ None,
+ "consider using a more meaningful name"
+ );
+ }
+ }
+}
+```
+
+We separate the lint conditional from the lint emissions because it makes the
+code a bit easier to read. In some cases this separation would also allow to
+write some unit tests (as opposed to only UI tests) for the separate function.
+
+In our example, `is_foo_fn` looks like:
+
+```rust
+// use statements, impl EarlyLintPass, check_fn, ..
+
+fn is_foo_fn(fn_kind: FnKind<'_>) -> bool {
+ match fn_kind {
+ FnKind::Fn(_, ident, ..) => {
+ // check if `fn` name is `foo`
+ ident.name.as_str() == "foo"
+ }
+ // ignore closures
+ FnKind::Closure(..) => false
+ }
+}
+```
+
+Now we should also run the full test suite with `cargo test`. At this point
+running `cargo test` should produce the expected output. Remember to run `cargo
+dev bless` to update the `.stderr` file.
+
+`cargo test` (as opposed to `cargo uitest`) will also ensure that our lint
+implementation is not violating any Clippy lints itself.
+
+That should be it for the lint implementation. Running `cargo test` should now
+pass.
+
+[fn_kind]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/visit/enum.FnKind.html
+[`FnKind::Fn`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/visit/enum.FnKind.html#variant.Fn
+[ident]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/symbol/struct.Ident.html
+
+## Specifying the lint's minimum supported Rust version (MSRV)
+
+Sometimes a lint makes suggestions that require a certain version of Rust. For
+example, the `manual_strip` lint suggests using `str::strip_prefix` and
+`str::strip_suffix` which is only available after Rust 1.45. In such cases, you
+need to ensure that the MSRV configured for the project is >= the MSRV of the
+required Rust feature. If multiple features are required, just use the one with
+a lower MSRV.
+
+First, add an MSRV alias for the required feature in [`clippy_utils::msrvs`].
+This can be accessed later as `msrvs::STR_STRIP_PREFIX`, for example.
+
+```rust
+msrv_aliases! {
+ ..
+ 1,45,0 { STR_STRIP_PREFIX }
+}
+```
+
+In order to access the project-configured MSRV, you need to have an `msrv` field
+in the LintPass struct, and a constructor to initialize the field. The `msrv`
+value is passed to the constructor in `clippy_lints/lib.rs`.
+
+```rust
+pub struct ManualStrip {
+ msrv: Option<RustcVersion>,
+}
+
+impl ManualStrip {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+```
+
+The project's MSRV can then be matched against the feature MSRV in the LintPass
+using the `meets_msrv` utility function.
+
+``` rust
+if !meets_msrv(self.msrv, msrvs::STR_STRIP_PREFIX) {
+ return;
+}
+```
+
+The project's MSRV can also be specified as an inner attribute, which overrides
+the value from `clippy.toml`. This can be accounted for using the
+`extract_msrv_attr!(LintContext)` macro and passing
+`LateContext`/`EarlyContext`.
+
+```rust
+impl<'tcx> LateLintPass<'tcx> for ManualStrip {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ ...
+ }
+ extract_msrv_attr!(LateContext);
+}
+```
+
+Once the `msrv` is added to the lint, a relevant test case should be added to
+`tests/ui/min_rust_version_attr.rs` which verifies that the lint isn't emitted
+if the project's MSRV is lower.
+
+As a last step, the lint should be added to the lint documentation. This is done
+in `clippy_lints/src/utils/conf.rs`:
+
+```rust
+define_Conf! {
+ /// Lint: LIST, OF, LINTS, <THE_NEWLY_ADDED_LINT>. The minimum rust version that the project supports
+ (msrv: Option<String> = None),
+ ...
+}
+```
+
+[`clippy_utils::msrvs`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/msrvs/index.html
+
+## Author lint
+
+If you have trouble implementing your lint, there is also the internal `author`
+lint to generate Clippy code that detects the offending pattern. It does not
+work for all of the Rust syntax, but can give a good starting point.
+
+The quickest way to use it, is the [Rust playground:
+play.rust-lang.org][author_example]. Put the code you want to lint into the
+editor and add the `#[clippy::author]` attribute above the item. Then run Clippy
+via `Tools -> Clippy` and you should see the generated code in the output below.
+
+[Here][author_example] is an example on the playground.
+
+If the command was executed successfully, you can copy the code over to where
+you are implementing your lint.
+
+[author_example]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=9a12cb60e5c6ad4e3003ac6d5e63cf55
+
+## Print HIR lint
+
+To implement a lint, it's helpful to first understand the internal
+representation that rustc uses. Clippy has the `#[clippy::dump]` attribute that
+prints the [_High-Level Intermediate Representation (HIR)_] of the item,
+statement, or expression that the attribute is attached to. To attach the
+attribute to expressions you often need to enable
+`#![feature(stmt_expr_attributes)]`.
+
+[Here][print_hir_example] you can find an example, just select _Tools_ and run
+_Clippy_.
+
+[_High-Level Intermediate Representation (HIR)_]: https://rustc-dev-guide.rust-lang.org/hir.html
+[print_hir_example]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=daf14db3a7f39ca467cd1b86c34b9afb
+
+## Documentation
+
+The final thing before submitting our PR is to add some documentation to our
+lint declaration.
+
+Please document your lint with a doc comment akin to the following:
+
+```rust
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for ... (describe what the lint matches).
+ ///
+ /// ### Why is this bad?
+ /// Supply the reason for linting the code.
+ ///
+ /// ### Example
+ ///
+ /// ```rust,ignore
+ /// // A short example of code that triggers the lint
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// // A short example of improved code that doesn't trigger the lint
+ /// ```
+ #[clippy::version = "1.29.0"]
+ pub FOO_FUNCTIONS,
+ pedantic,
+ "function named `foo`, which is not a descriptive name"
+}
+```
+
+Once your lint is merged, this documentation will show up in the [lint
+list][lint_list].
+
+[lint_list]: https://rust-lang.github.io/rust-clippy/master/index.html
+
+## Running rustfmt
+
+[Rustfmt] is a tool for formatting Rust code according to style guidelines. Your
+code has to be formatted by `rustfmt` before a PR can be merged. Clippy uses
+nightly `rustfmt` in the CI.
+
+It can be installed via `rustup`:
+
+```bash
+rustup component add rustfmt --toolchain=nightly
+```
+
+Use `cargo dev fmt` to format the whole codebase. Make sure that `rustfmt` is
+installed for the nightly toolchain.
+
+[Rustfmt]: https://github.com/rust-lang/rustfmt
+
+## Debugging
+
+If you want to debug parts of your lint implementation, you can use the [`dbg!`]
+macro anywhere in your code. Running the tests should then include the debug
+output in the `stdout` part.
+
+[`dbg!`]: https://doc.rust-lang.org/std/macro.dbg.html
+
+## PR Checklist
+
+Before submitting your PR make sure you followed all of the basic requirements:
+
+<!-- Sync this with `.github/PULL_REQUEST_TEMPLATE` -->
+
+- \[ ] Followed [lint naming conventions][lint_naming]
+- \[ ] Added passing UI tests (including committed `.stderr` file)
+- \[ ] `cargo test` passes locally
+- \[ ] Executed `cargo dev update_lints`
+- \[ ] Added lint documentation
+- \[ ] Run `cargo dev fmt`
+
+## Adding configuration to a lint
+
+Clippy supports the configuration of lints values using a `clippy.toml` file in
+the workspace directory. Adding a configuration to a lint can be useful for
+thresholds or to constrain some behavior that can be seen as a false positive
+for some users. Adding a configuration is done in the following steps:
+
+1. Adding a new configuration entry to [`clippy_lints::utils::conf`] like this:
+
+ ```rust
+ /// Lint: LINT_NAME.
+ ///
+ /// <The configuration field doc comment>
+ (configuration_ident: Type = DefaultValue),
+ ```
+
+ The doc comment is automatically added to the documentation of the listed
+ lints. The default value will be formatted using the `Debug` implementation
+ of the type.
+2. Adding the configuration value to the lint impl struct:
+ 1. This first requires the definition of a lint impl struct. Lint impl
+ structs are usually generated with the `declare_lint_pass!` macro. This
+ struct needs to be defined manually to add some kind of metadata to it:
+ ```rust
+ // Generated struct definition
+ declare_lint_pass!(StructName => [
+ LINT_NAME
+ ]);
+
+ // New manual definition struct
+ #[derive(Copy, Clone)]
+ pub struct StructName {}
+
+ impl_lint_pass!(StructName => [
+ LINT_NAME
+ ]);
+ ```
+
+ 2. Next add the configuration value and a corresponding creation method like
+ this:
+ ```rust
+ #[derive(Copy, Clone)]
+ pub struct StructName {
+ configuration_ident: Type,
+ }
+
+ // ...
+
+ impl StructName {
+ pub fn new(configuration_ident: Type) -> Self {
+ Self {
+ configuration_ident,
+ }
+ }
+ }
+ ```
+3. Passing the configuration value to the lint impl struct:
+
+ First find the struct construction in the [`clippy_lints` lib file]. The
+ configuration value is now cloned or copied into a local value that is then
+ passed to the impl struct like this:
+
+ ```rust
+ // Default generated registration:
+ store.register_*_pass(|| box module::StructName);
+
+ // New registration with configuration value
+ let configuration_ident = conf.configuration_ident.clone();
+ store.register_*_pass(move || box module::StructName::new(configuration_ident));
+ ```
+
+ Congratulations the work is almost done. The configuration value can now be
+ accessed in the linting code via `self.configuration_ident`.
+
+4. Adding tests:
+ 1. The default configured value can be tested like any normal lint in
+ [`tests/ui`].
+ 2. The configuration itself will be tested separately in [`tests/ui-toml`].
+ Simply add a new subfolder with a fitting name. This folder contains a
+ `clippy.toml` file with the configuration value and a rust file that
+ should be linted by Clippy. The test can otherwise be written as usual.
+
+[`clippy_lints::utils::conf`]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/utils/conf.rs
+[`clippy_lints` lib file]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
+[`tests/ui`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui
+[`tests/ui-toml`]: https://github.com/rust-lang/rust-clippy/blob/master/tests/ui-toml
+
+## Cheat Sheet
+
+Here are some pointers to things you are likely going to need for every lint:
+
+* [Clippy utils][utils] - Various helper functions. Maybe the function you need
+ is already in here ([`is_type_diagnostic_item`], [`implements_trait`],
+ [`snippet`], etc)
+* [Clippy diagnostics][diagnostics]
+* [Let chains][let-chains]
+* [`from_expansion`][from_expansion] and
+ [`in_external_macro`][in_external_macro]
+* [`Span`][span]
+* [`Applicability`][applicability]
+* [Common tools for writing lints](common_tools_writing_lints.md) helps with
+ common operations
+* [The rustc-dev-guide][rustc-dev-guide] explains a lot of internal compiler
+ concepts
+* [The nightly rustc docs][nightly_docs] which has been linked to throughout
+ this guide
+
+For `EarlyLintPass` lints:
+
+* [`EarlyLintPass`][early_lint_pass]
+* [`rustc_ast::ast`][ast]
+
+For `LateLintPass` lints:
+
+* [`LateLintPass`][late_lint_pass]
+* [`Ty::TyKind`][ty]
+
+While most of Clippy's lint utils are documented, most of rustc's internals lack
+documentation currently. This is unfortunate, but in most cases you can probably
+get away with copying things from existing similar lints. If you are stuck,
+don't hesitate to ask on [Zulip] or in the issue/PR.
+
+[utils]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/index.html
+[`is_type_diagnostic_item`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/ty/fn.is_type_diagnostic_item.html
+[`implements_trait`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/ty/fn.implements_trait.html
+[`snippet`]: https://doc.rust-lang.org/nightly/nightly-rustc/clippy_utils/source/fn.snippet.html
+[let-chains]: https://github.com/rust-lang/rust/pull/94927
+[from_expansion]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/struct.Span.html#method.from_expansion
+[in_external_macro]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/lint/fn.in_external_macro.html
+[span]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_span/struct.Span.html
+[applicability]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/enum.Applicability.html
+[rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org/
+[nightly_docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/
+[ast]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/index.html
+[ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/sty/index.html
+[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/clippy
--- /dev/null
- [src](https://github.com/joshrotenberg/rust-clippy/tree/clippy_guide/book/src)
+# The Clippy Book
+
+This document explains how to make additions and changes to the Clippy book, the
+guide to Clippy that you're reading right now. The Clippy book is formatted with
+[Markdown](https://www.markdownguide.org) and generated by
+[mdbook](https://github.com/rust-lang/mdBook).
+
+- [Get mdbook](#get-mdbook)
+- [Make changes](#make-changes)
+
+## Get mdbook
+
+While not strictly necessary since the book source is simply Markdown text
+files, having mdbook locally will allow you to build, test and serve the book
+locally to view changes before you commit them to the repository. You likely
+already have `cargo` installed, so the easiest option is to simply:
+
+```shell
+cargo install mdbook
+```
+
+See the mdbook [installation](https://github.com/rust-lang/mdBook#installation)
+instructions for other options.
+
+## Make changes
+
+The book's
++[src](https://github.com/rust-lang/rust-clippy/tree/master/book/src)
+directory contains all of the markdown files used to generate the book. If you
+want to see your changes in real time, you can use the mdbook `serve` command to
+run a web server locally that will automatically update changes as they are
+made. From the top level of your `rust-clippy` directory:
+
+```shell
+mdbook serve book --open
+```
+
+Then navigate to `http://localhost:3000` to see the generated book. While the
+server is running, changes you make will automatically be updated.
+
+For more information, see the mdbook
+[guide](https://rust-lang.github.io/mdBook/).
--- /dev/null
- RaSetupActive,
+use crate::clippy_project_root;
+use itertools::Itertools;
+use shell_escape::escape;
+use std::ffi::{OsStr, OsString};
+use std::path::Path;
+use std::process::{self, Command, Stdio};
+use std::{fs, io};
+use walkdir::WalkDir;
+
+#[derive(Debug)]
+pub enum CliError {
+ CommandFailed(String, String),
+ IoError(io::Error),
+ RustfmtNotInstalled,
+ WalkDirError(walkdir::Error),
- return Err(CliError::RaSetupActive);
++ IntellijSetupActive,
+}
+
+impl From<io::Error> for CliError {
+ fn from(error: io::Error) -> Self {
+ Self::IoError(error)
+ }
+}
+
+impl From<walkdir::Error> for CliError {
+ fn from(error: walkdir::Error) -> Self {
+ Self::WalkDirError(error)
+ }
+}
+
+struct FmtContext {
+ check: bool,
+ verbose: bool,
+ rustfmt_path: String,
+}
+
+// the "main" function of cargo dev fmt
+pub fn run(check: bool, verbose: bool) {
+ fn try_run(context: &FmtContext) -> Result<bool, CliError> {
+ let mut success = true;
+
+ let project_root = clippy_project_root();
+
+ // if we added a local rustc repo as path dependency to clippy for rust analyzer, we do NOT want to
+ // format because rustfmt would also format the entire rustc repo as it is a local
+ // dependency
+ if fs::read_to_string(project_root.join("Cargo.toml"))
+ .expect("Failed to read clippy Cargo.toml")
+ .contains(&"[target.'cfg(NOT_A_PLATFORM)'.dependencies]")
+ {
- CliError::RaSetupActive => {
++ return Err(CliError::IntellijSetupActive);
+ }
+
+ rustfmt_test(context)?;
+
+ success &= cargo_fmt(context, project_root.as_path())?;
+ success &= cargo_fmt(context, &project_root.join("clippy_dev"))?;
+ success &= cargo_fmt(context, &project_root.join("rustc_tools_util"))?;
+ success &= cargo_fmt(context, &project_root.join("lintcheck"))?;
+
+ let chunks = WalkDir::new(project_root.join("tests"))
+ .into_iter()
+ .filter_map(|entry| {
+ let entry = entry.expect("failed to find tests");
+ let path = entry.path();
+
+ if path.extension() != Some("rs".as_ref()) || entry.file_name() == "ice-3891.rs" {
+ None
+ } else {
+ Some(entry.into_path().into_os_string())
+ }
+ })
+ .chunks(250);
+
+ for chunk in &chunks {
+ success &= rustfmt(context, chunk)?;
+ }
+
+ Ok(success)
+ }
+
+ fn output_err(err: CliError) {
+ match err {
+ CliError::CommandFailed(command, stderr) => {
+ eprintln!("error: A command failed! `{}`\nstderr: {}", command, stderr);
+ },
+ CliError::IoError(err) => {
+ eprintln!("error: {}", err);
+ },
+ CliError::RustfmtNotInstalled => {
+ eprintln!("error: rustfmt nightly is not installed.");
+ },
+ CliError::WalkDirError(err) => {
+ eprintln!("error: {}", err);
+ },
- Please revert the changes to Cargo.tomls first."
++ CliError::IntellijSetupActive => {
+ eprintln!(
+ "error: a local rustc repo is enabled as path dependency via `cargo dev setup intellij`.
+Not formatting because that would format the local repo as well!
++Please revert the changes to Cargo.tomls with `cargo dev remove intellij`."
+ );
+ },
+ }
+ }
+
+ let output = Command::new("rustup")
+ .args(["which", "rustfmt"])
+ .stderr(Stdio::inherit())
+ .output()
+ .expect("error running `rustup which rustfmt`");
+ if !output.status.success() {
+ eprintln!("`rustup which rustfmt` did not execute successfully");
+ process::exit(1);
+ }
+ let mut rustfmt_path = String::from_utf8(output.stdout).expect("invalid rustfmt path");
+ rustfmt_path.truncate(rustfmt_path.trim_end().len());
+
+ let context = FmtContext {
+ check,
+ verbose,
+ rustfmt_path,
+ };
+ let result = try_run(&context);
+ let code = match result {
+ Ok(true) => 0,
+ Ok(false) => {
+ eprintln!();
+ eprintln!("Formatting check failed.");
+ eprintln!("Run `cargo dev fmt` to update formatting.");
+ 1
+ },
+ Err(err) => {
+ output_err(err);
+ 1
+ },
+ };
+ process::exit(code);
+}
+
+fn format_command(program: impl AsRef<OsStr>, dir: impl AsRef<Path>, args: &[impl AsRef<OsStr>]) -> String {
+ let arg_display: Vec<_> = args.iter().map(|a| escape(a.as_ref().to_string_lossy())).collect();
+
+ format!(
+ "cd {} && {} {}",
+ escape(dir.as_ref().to_string_lossy()),
+ escape(program.as_ref().to_string_lossy()),
+ arg_display.join(" ")
+ )
+}
+
+fn exec(
+ context: &FmtContext,
+ program: impl AsRef<OsStr>,
+ dir: impl AsRef<Path>,
+ args: &[impl AsRef<OsStr>],
+) -> Result<bool, CliError> {
+ if context.verbose {
+ println!("{}", format_command(&program, &dir, args));
+ }
+
+ let output = Command::new(&program)
+ .env("RUSTFMT", &context.rustfmt_path)
+ .current_dir(&dir)
+ .args(args.iter())
+ .output()
+ .unwrap();
+ let success = output.status.success();
+
+ if !context.check && !success {
+ let stderr = std::str::from_utf8(&output.stderr).unwrap_or("");
+ return Err(CliError::CommandFailed(
+ format_command(&program, &dir, args),
+ String::from(stderr),
+ ));
+ }
+
+ Ok(success)
+}
+
+fn cargo_fmt(context: &FmtContext, path: &Path) -> Result<bool, CliError> {
+ let mut args = vec!["fmt", "--all"];
+ if context.check {
+ args.push("--check");
+ }
+ let success = exec(context, "cargo", path, &args)?;
+
+ Ok(success)
+}
+
+fn rustfmt_test(context: &FmtContext) -> Result<(), CliError> {
+ let program = "rustfmt";
+ let dir = std::env::current_dir()?;
+ let args = &["--version"];
+
+ if context.verbose {
+ println!("{}", format_command(&program, &dir, args));
+ }
+
+ let output = Command::new(&program).current_dir(&dir).args(args.iter()).output()?;
+
+ if output.status.success() {
+ Ok(())
+ } else if std::str::from_utf8(&output.stderr)
+ .unwrap_or("")
+ .starts_with("error: 'rustfmt' is not installed")
+ {
+ Err(CliError::RustfmtNotInstalled)
+ } else {
+ Err(CliError::CommandFailed(
+ format_command(&program, &dir, args),
+ std::str::from_utf8(&output.stderr).unwrap_or("").to_string(),
+ ))
+ }
+}
+
+fn rustfmt(context: &FmtContext, paths: impl Iterator<Item = OsString>) -> Result<bool, CliError> {
+ let mut args = Vec::new();
+ if context.check {
+ args.push(OsString::from("--check"));
+ }
+ args.extend(paths);
+
+ let success = exec(context, &context.rustfmt_path, std::env::current_dir()?, &args)?;
+
+ Ok(success)
+}
--- /dev/null
- matches.get_one::<String>("category"),
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use clap::{Arg, ArgAction, ArgMatches, Command, PossibleValue};
+use clippy_dev::{bless, dogfood, fmt, lint, new_lint, serve, setup, update_lints};
+use indoc::indoc;
+
+fn main() {
+ let matches = get_clap_config();
+
+ match matches.subcommand() {
+ Some(("bless", matches)) => {
+ bless::bless(matches.contains_id("ignore-timestamp"));
+ },
+ Some(("dogfood", matches)) => {
+ dogfood::dogfood(
+ matches.contains_id("fix"),
+ matches.contains_id("allow-dirty"),
+ matches.contains_id("allow-staged"),
+ );
+ },
+ Some(("fmt", matches)) => {
+ fmt::run(matches.contains_id("check"), matches.contains_id("verbose"));
+ },
+ Some(("update_lints", matches)) => {
+ if matches.contains_id("print-only") {
+ update_lints::print_lints();
+ } else if matches.contains_id("check") {
+ update_lints::update(update_lints::UpdateMode::Check);
+ } else {
+ update_lints::update(update_lints::UpdateMode::Change);
+ }
+ },
+ Some(("new_lint", matches)) => {
+ match new_lint::create(
+ matches.get_one::<String>("pass"),
+ matches.get_one::<String>("name"),
- .required(true),
++ matches.get_one::<String>("category").map(String::as_str),
++ matches.get_one::<String>("type").map(String::as_str),
+ matches.contains_id("msrv"),
+ ) {
+ Ok(_) => update_lints::update(update_lints::UpdateMode::Change),
+ Err(e) => eprintln!("Unable to create lint: {}", e),
+ }
+ },
+ Some(("setup", sub_command)) => match sub_command.subcommand() {
+ Some(("intellij", matches)) => {
+ if matches.contains_id("remove") {
+ setup::intellij::remove_rustc_src();
+ } else {
+ setup::intellij::setup_rustc_src(
+ matches
+ .get_one::<String>("rustc-repo-path")
+ .expect("this field is mandatory and therefore always valid"),
+ );
+ }
+ },
+ Some(("git-hook", matches)) => {
+ if matches.contains_id("remove") {
+ setup::git_hook::remove_hook();
+ } else {
+ setup::git_hook::install_hook(matches.contains_id("force-override"));
+ }
+ },
+ Some(("vscode-tasks", matches)) => {
+ if matches.contains_id("remove") {
+ setup::vscode::remove_tasks();
+ } else {
+ setup::vscode::install_tasks(matches.contains_id("force-override"));
+ }
+ },
+ _ => {},
+ },
+ Some(("remove", sub_command)) => match sub_command.subcommand() {
+ Some(("git-hook", _)) => setup::git_hook::remove_hook(),
+ Some(("intellij", _)) => setup::intellij::remove_rustc_src(),
+ Some(("vscode-tasks", _)) => setup::vscode::remove_tasks(),
+ _ => {},
+ },
+ Some(("serve", matches)) => {
+ let port = *matches.get_one::<u16>("port").unwrap();
+ let lint = matches.get_one::<String>("lint");
+ serve::run(port, lint);
+ },
+ Some(("lint", matches)) => {
+ let path = matches.get_one::<String>("path").unwrap();
+ let args = matches.get_many::<String>("args").into_iter().flatten();
+ lint::run(path, args);
+ },
+ Some(("rename_lint", matches)) => {
+ let old_name = matches.get_one::<String>("old_name").unwrap();
+ let new_name = matches.get_one::<String>("new_name").unwrap_or(old_name);
+ let uplift = matches.contains_id("uplift");
+ update_lints::rename(old_name, new_name, uplift);
+ },
+ Some(("deprecate", matches)) => {
+ let name = matches.get_one::<String>("name").unwrap();
+ let reason = matches.get_one("reason");
+ update_lints::deprecate(name, reason);
+ },
+ _ => {},
+ }
+}
+
+fn get_clap_config() -> ArgMatches {
+ Command::new("Clippy developer tooling")
+ .arg_required_else_help(true)
+ .subcommands([
+ Command::new("bless").about("bless the test output changes").arg(
+ Arg::new("ignore-timestamp")
+ .long("ignore-timestamp")
+ .help("Include files updated before clippy was built"),
+ ),
+ Command::new("dogfood").about("Runs the dogfood test").args([
+ Arg::new("fix").long("fix").help("Apply the suggestions when possible"),
+ Arg::new("allow-dirty")
+ .long("allow-dirty")
+ .help("Fix code even if the working directory has changes")
+ .requires("fix"),
+ Arg::new("allow-staged")
+ .long("allow-staged")
+ .help("Fix code even if the working directory has staged changes")
+ .requires("fix"),
+ ]),
+ Command::new("fmt")
+ .about("Run rustfmt on all projects and tests")
+ .args([
+ Arg::new("check").long("check").help("Use the rustfmt --check option"),
+ Arg::new("verbose").short('v').long("verbose").help("Echo commands run"),
+ ]),
+ Command::new("update_lints")
+ .about("Updates lint registration and information from the source code")
+ .long_about(
+ "Makes sure that:\n \
+ * the lint count in README.md is correct\n \
+ * the changelog contains markdown link references at the bottom\n \
+ * all lint groups include the correct lints\n \
+ * lint modules in `clippy_lints/*` are visible in `src/lib.rs` via `pub mod`\n \
+ * all lints are registered in the lint store",
+ )
+ .args([
+ Arg::new("print-only").long("print-only").help(
+ "Print a table of lints to STDOUT. \
+ This does not include deprecated and internal lints. \
+ (Does not modify any files)",
+ ),
+ Arg::new("check")
+ .long("check")
+ .help("Checks that `cargo dev update_lints` has been run. Used on CI."),
+ ]),
+ Command::new("new_lint")
+ .about("Create new lint and run `cargo dev update_lints`")
+ .args([
+ Arg::new("pass")
+ .short('p')
+ .long("pass")
+ .help("Specify whether the lint runs during the early or late pass")
+ .takes_value(true)
+ .value_parser([PossibleValue::new("early"), PossibleValue::new("late")])
++ .conflicts_with("type")
++ .required_unless_present("type"),
+ Arg::new("name")
+ .short('n')
+ .long("name")
+ .help("Name of the new lint in snake case, ex: fn_too_long")
+ .takes_value(true)
+ .required(true),
+ Arg::new("category")
+ .short('c')
+ .long("category")
+ .help("What category the lint belongs to")
+ .default_value("nursery")
+ .value_parser([
+ PossibleValue::new("style"),
+ PossibleValue::new("correctness"),
+ PossibleValue::new("suspicious"),
+ PossibleValue::new("complexity"),
+ PossibleValue::new("perf"),
+ PossibleValue::new("pedantic"),
+ PossibleValue::new("restriction"),
+ PossibleValue::new("cargo"),
+ PossibleValue::new("nursery"),
+ PossibleValue::new("internal"),
+ PossibleValue::new("internal_warn"),
+ ])
+ .takes_value(true),
++ Arg::new("type")
++ .long("type")
++ .help("What directory the lint belongs in")
++ .takes_value(true)
++ .required(false),
+ Arg::new("msrv").long("msrv").help("Add MSRV config code to the lint"),
+ ]),
+ Command::new("setup")
+ .about("Support for setting up your personal development environment")
+ .arg_required_else_help(true)
+ .subcommands([
+ Command::new("intellij")
+ .about("Alter dependencies so Intellij Rust can find rustc internals")
+ .args([
+ Arg::new("remove")
+ .long("remove")
+ .help("Remove the dependencies added with 'cargo dev setup intellij'")
+ .required(false),
+ Arg::new("rustc-repo-path")
+ .long("repo-path")
+ .short('r')
+ .help("The path to a rustc repo that will be used for setting the dependencies")
+ .takes_value(true)
+ .value_name("path")
+ .conflicts_with("remove")
+ .required(true),
+ ]),
+ Command::new("git-hook")
+ .about("Add a pre-commit git hook that formats your code to make it look pretty")
+ .args([
+ Arg::new("remove")
+ .long("remove")
+ .help("Remove the pre-commit hook added with 'cargo dev setup git-hook'")
+ .required(false),
+ Arg::new("force-override")
+ .long("force-override")
+ .short('f')
+ .help("Forces the override of an existing git pre-commit hook")
+ .required(false),
+ ]),
+ Command::new("vscode-tasks")
+ .about("Add several tasks to vscode for formatting, validation and testing")
+ .args([
+ Arg::new("remove")
+ .long("remove")
+ .help("Remove the tasks added with 'cargo dev setup vscode-tasks'")
+ .required(false),
+ Arg::new("force-override")
+ .long("force-override")
+ .short('f')
+ .help("Forces the override of existing vscode tasks")
+ .required(false),
+ ]),
+ ]),
+ Command::new("remove")
+ .about("Support for undoing changes done by the setup command")
+ .arg_required_else_help(true)
+ .subcommands([
+ Command::new("git-hook").about("Remove any existing pre-commit git hook"),
+ Command::new("vscode-tasks").about("Remove any existing vscode tasks"),
+ Command::new("intellij").about("Removes rustc source paths added via `cargo dev setup intellij`"),
+ ]),
+ Command::new("serve")
+ .about("Launch a local 'ALL the Clippy Lints' website in a browser")
+ .args([
+ Arg::new("port")
+ .long("port")
+ .short('p')
+ .help("Local port for the http server")
+ .default_value("8000")
+ .value_parser(clap::value_parser!(u16)),
+ Arg::new("lint").help("Which lint's page to load initially (optional)"),
+ ]),
+ Command::new("lint")
+ .about("Manually run clippy on a file or package")
+ .after_help(indoc! {"
+ EXAMPLES
+ Lint a single file:
+ cargo dev lint tests/ui/attrs.rs
+
+ Lint a package directory:
+ cargo dev lint tests/ui-cargo/wildcard_dependencies/fail
+ cargo dev lint ~/my-project
+
+ Run rustfix:
+ cargo dev lint ~/my-project -- --fix
+
+ Set lint levels:
+ cargo dev lint file.rs -- -W clippy::pedantic
+ cargo dev lint ~/my-project -- -- -W clippy::pedantic
+ "})
+ .args([
+ Arg::new("path")
+ .required(true)
+ .help("The path to a file or package directory to lint"),
+ Arg::new("args")
+ .action(ArgAction::Append)
+ .help("Pass extra arguments to cargo/clippy-driver"),
+ ]),
+ Command::new("rename_lint").about("Renames the given lint").args([
+ Arg::new("old_name")
+ .index(1)
+ .required(true)
+ .help("The name of the lint to rename"),
+ Arg::new("new_name")
+ .index(2)
+ .required_unless_present("uplift")
+ .help("The new name of the lint"),
+ Arg::new("uplift")
+ .long("uplift")
+ .help("This lint will be uplifted into rustc"),
+ ]),
+ Command::new("deprecate").about("Deprecates the given lint").args([
+ Arg::new("name")
+ .index(1)
+ .required(true)
+ .help("The name of the lint to deprecate"),
+ Arg::new("reason")
+ .long("reason")
+ .short('r')
+ .required(false)
+ .takes_value(true)
+ .help("The reason for deprecation"),
+ ]),
+ ])
+ .get_matches()
+}
--- /dev/null
- use indoc::indoc;
+use crate::clippy_project_root;
- category: Option<&String>,
++use indoc::{indoc, writedoc};
+use std::fmt::Write as _;
+use std::fs::{self, OpenOptions};
+use std::io::prelude::*;
+use std::io::{self, ErrorKind};
+use std::path::{Path, PathBuf};
+
+struct LintData<'a> {
+ pass: &'a str,
+ name: &'a str,
+ category: &'a str,
++ ty: Option<&'a str>,
+ project_root: PathBuf,
+}
+
+trait Context {
+ fn context<C: AsRef<str>>(self, text: C) -> Self;
+}
+
+impl<T> Context for io::Result<T> {
+ fn context<C: AsRef<str>>(self, text: C) -> Self {
+ match self {
+ Ok(t) => Ok(t),
+ Err(e) => {
+ let message = format!("{}: {}", text.as_ref(), e);
+ Err(io::Error::new(ErrorKind::Other, message))
+ },
+ }
+ }
+}
+
+/// Creates the files required to implement and test a new lint and runs `update_lints`.
+///
+/// # Errors
+///
+/// This function errors out if the files couldn't be created or written to.
+pub fn create(
+ pass: Option<&String>,
+ lint_name: Option<&String>,
- pass: pass.expect("`pass` argument is validated by clap"),
++ category: Option<&str>,
++ mut ty: Option<&str>,
+ msrv: bool,
+) -> io::Result<()> {
++ if category == Some("cargo") && ty.is_none() {
++ // `cargo` is a special category, these lints should always be in `clippy_lints/src/cargo`
++ ty = Some("cargo");
++ }
++
+ let lint = LintData {
- add_lint(&lint, msrv).context("Unable to add lint to clippy_lints/src/lib.rs")
++ pass: pass.map_or("", String::as_str),
+ name: lint_name.expect("`name` argument is validated by clap"),
+ category: category.expect("`category` argument is validated by clap"),
++ ty,
+ project_root: clippy_project_root(),
+ };
+
+ create_lint(&lint, msrv).context("Unable to create lint implementation")?;
+ create_test(&lint).context("Unable to create a test for the new lint")?;
- let lint_contents = get_lint_file_contents(lint, enable_msrv);
++
++ if lint.ty.is_none() {
++ add_lint(&lint, msrv).context("Unable to add lint to clippy_lints/src/lib.rs")?;
++ }
++
++ Ok(())
+}
+
+fn create_lint(lint: &LintData<'_>, enable_msrv: bool) -> io::Result<()> {
- let lint_path = format!("clippy_lints/src/{}.rs", lint.name);
- write_file(lint.project_root.join(&lint_path), lint_contents.as_bytes())
++ if let Some(ty) = lint.ty {
++ create_lint_for_ty(lint, enable_msrv, ty)
++ } else {
++ let lint_contents = get_lint_file_contents(lint, enable_msrv);
++ let lint_path = format!("clippy_lints/src/{}.rs", lint.name);
++ write_file(lint.project_root.join(&lint_path), lint_contents.as_bytes())?;
++ println!("Generated lint file: `{}`", lint_path);
+
- let test_dir = lint.project_root.join(relative_test_dir);
++ Ok(())
++ }
+}
+
+fn create_test(lint: &LintData<'_>) -> io::Result<()> {
+ fn create_project_layout<P: Into<PathBuf>>(lint_name: &str, location: P, case: &str, hint: &str) -> io::Result<()> {
+ let mut path = location.into().join(case);
+ fs::create_dir(&path)?;
+ write_file(path.join("Cargo.toml"), get_manifest_contents(lint_name, hint))?;
+
+ path.push("src");
+ fs::create_dir(&path)?;
+ let header = format!("// compile-flags: --crate-name={}", lint_name);
+ write_file(path.join("main.rs"), get_test_file_contents(lint_name, Some(&header)))?;
+
+ Ok(())
+ }
+
+ if lint.category == "cargo" {
+ let relative_test_dir = format!("tests/ui-cargo/{}", lint.name);
- create_project_layout(lint.name, &test_dir, "pass", "This file should not trigger the lint")
++ let test_dir = lint.project_root.join(&relative_test_dir);
+ fs::create_dir(&test_dir)?;
+
+ create_project_layout(lint.name, &test_dir, "fail", "Content that triggers the lint goes here")?;
- write_file(lint.project_root.join(test_path), test_contents)
++ create_project_layout(lint.name, &test_dir, "pass", "This file should not trigger the lint")?;
++
++ println!("Generated test directories: `{relative_test_dir}/pass`, `{relative_test_dir}/fail`");
+ } else {
+ let test_path = format!("tests/ui/{}.rs", lint.name);
+ let test_contents = get_test_file_contents(lint.name, None);
- let version = get_stabilization_version();
++ write_file(lint.project_root.join(&test_path), test_contents)?;
++
++ println!("Generated test file: `{}`", test_path);
+ }
++
++ Ok(())
+}
+
+fn add_lint(lint: &LintData<'_>, enable_msrv: bool) -> io::Result<()> {
+ let path = "clippy_lints/src/lib.rs";
+ let mut lib_rs = fs::read_to_string(path).context("reading")?;
+
+ let comment_start = lib_rs.find("// add lints here,").expect("Couldn't find comment");
+
+ let new_lint = if enable_msrv {
+ format!(
+ "store.register_{lint_pass}_pass(move || Box::new({module_name}::{camel_name}::new(msrv)));\n ",
+ lint_pass = lint.pass,
+ module_name = lint.name,
+ camel_name = to_camel_case(lint.name),
+ )
+ } else {
+ format!(
+ "store.register_{lint_pass}_pass(|| Box::new({module_name}::{camel_name}));\n ",
+ lint_pass = lint.pass,
+ module_name = lint.name,
+ camel_name = to_camel_case(lint.name),
+ )
+ };
+
+ lib_rs.insert_str(comment_start, &new_lint);
+
+ fs::write(path, lib_rs).context("writing")
+}
+
+fn write_file<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> io::Result<()> {
+ fn inner(path: &Path, contents: &[u8]) -> io::Result<()> {
+ OpenOptions::new()
+ .write(true)
+ .create_new(true)
+ .open(path)?
+ .write_all(contents)
+ }
+
+ inner(path.as_ref(), contents.as_ref()).context(format!("writing to file: {}", path.as_ref().display()))
+}
+
+fn to_camel_case(name: &str) -> String {
+ name.split('_')
+ .map(|s| {
+ if s.is_empty() {
+ String::from("")
+ } else {
+ [&s[0..1].to_uppercase(), &s[1..]].concat()
+ }
+ })
+ .collect()
+}
+
+pub(crate) fn get_stabilization_version() -> String {
+ fn parse_manifest(contents: &str) -> Option<String> {
+ let version = contents
+ .lines()
+ .filter_map(|l| l.split_once('='))
+ .find_map(|(k, v)| (k.trim() == "version").then(|| v.trim()))?;
+ let Some(("0", version)) = version.get(1..version.len() - 1)?.split_once('.') else {
+ return None;
+ };
+ let (minor, patch) = version.split_once('.')?;
+ Some(format!(
+ "{}.{}.0",
+ minor.parse::<u32>().ok()?,
+ patch.parse::<u32>().ok()?
+ ))
+ }
+ let contents = fs::read_to_string("Cargo.toml").expect("Unable to read `Cargo.toml`");
+ parse_manifest(&contents).expect("Unable to find package version in `Cargo.toml`")
+}
+
+fn get_test_file_contents(lint_name: &str, header_commands: Option<&str>) -> String {
+ let mut contents = format!(
+ indoc! {"
+ #![warn(clippy::{})]
+
+ fn main() {{
+ // test code goes here
+ }}
+ "},
+ lint_name
+ );
+
+ if let Some(header) = header_commands {
+ contents = format!("{}\n{}", header, contents);
+ }
+
+ contents
+}
+
+fn get_manifest_contents(lint_name: &str, hint: &str) -> String {
+ format!(
+ indoc! {r#"
+ # {}
+
+ [package]
+ name = "{}"
+ version = "0.1.0"
+ publish = false
+
+ [workspace]
+ "#},
+ hint, lint_name
+ )
+}
+
+fn get_lint_file_contents(lint: &LintData<'_>, enable_msrv: bool) -> String {
+ let mut result = String::new();
+
+ let (pass_type, pass_lifetimes, pass_import, context_import) = match lint.pass {
+ "early" => ("EarlyLintPass", "", "use rustc_ast::ast::*;", "EarlyContext"),
+ "late" => ("LateLintPass", "<'_>", "use rustc_hir::*;", "LateContext"),
+ _ => {
+ unreachable!("`pass_type` should only ever be `early` or `late`!");
+ },
+ };
+
- let _ = write!(
- result,
- indoc! {r#"
- declare_clippy_lint! {{
- /// ### What it does
- ///
- /// ### Why is this bad?
- ///
- /// ### Example
- /// ```rust
- /// // example code where clippy issues a warning
- /// ```
- /// Use instead:
- /// ```rust
- /// // example code which does not raise clippy warning
- /// ```
- #[clippy::version = "{version}"]
- pub {name_upper},
- {category},
- "default lint description"
- }}
- "#},
- version = version,
- name_upper = name_upper,
- category = category,
- );
+ let lint_name = lint.name;
+ let category = lint.category;
+ let name_camel = to_camel_case(lint.name);
+ let name_upper = lint_name.to_uppercase();
+
+ result.push_str(&if enable_msrv {
+ format!(
+ indoc! {"
+ use clippy_utils::msrvs;
+ {pass_import}
+ use rustc_lint::{{{context_import}, {pass_type}, LintContext}};
+ use rustc_semver::RustcVersion;
+ use rustc_session::{{declare_tool_lint, impl_lint_pass}};
+
+ "},
+ pass_type = pass_type,
+ pass_import = pass_import,
+ context_import = context_import,
+ )
+ } else {
+ format!(
+ indoc! {"
+ {pass_import}
+ use rustc_lint::{{{context_import}, {pass_type}}};
+ use rustc_session::{{declare_lint_pass, declare_tool_lint}};
+
+ "},
+ pass_import = pass_import,
+ pass_type = pass_type,
+ context_import = context_import
+ )
+ });
+
++ let _ = write!(result, "{}", get_lint_declaration(&name_upper, category));
+
+ result.push_str(&if enable_msrv {
+ format!(
+ indoc! {"
+ pub struct {name_camel} {{
+ msrv: Option<RustcVersion>,
+ }}
+
+ impl {name_camel} {{
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {{
+ Self {{ msrv }}
+ }}
+ }}
+
+ impl_lint_pass!({name_camel} => [{name_upper}]);
+
+ impl {pass_type}{pass_lifetimes} for {name_camel} {{
+ extract_msrv_attr!({context_import});
+ }}
+
+ // TODO: Add MSRV level to `clippy_utils/src/msrvs.rs` if needed.
+ // TODO: Add MSRV test to `tests/ui/min_rust_version_attr.rs`.
+ // TODO: Update msrv config comment in `clippy_lints/src/utils/conf.rs`
+ "},
+ pass_type = pass_type,
+ pass_lifetimes = pass_lifetimes,
+ name_upper = name_upper,
+ name_camel = name_camel,
+ context_import = context_import,
+ )
+ } else {
+ format!(
+ indoc! {"
+ declare_lint_pass!({name_camel} => [{name_upper}]);
+
+ impl {pass_type}{pass_lifetimes} for {name_camel} {{}}
+ "},
+ pass_type = pass_type,
+ pass_lifetimes = pass_lifetimes,
+ name_upper = name_upper,
+ name_camel = name_camel,
+ )
+ });
+
+ result
+}
+
++fn get_lint_declaration(name_upper: &str, category: &str) -> String {
++ format!(
++ indoc! {r#"
++ declare_clippy_lint! {{
++ /// ### What it does
++ ///
++ /// ### Why is this bad?
++ ///
++ /// ### Example
++ /// ```rust
++ /// // example code where clippy issues a warning
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// // example code which does not raise clippy warning
++ /// ```
++ #[clippy::version = "{version}"]
++ pub {name_upper},
++ {category},
++ "default lint description"
++ }}
++ "#},
++ version = get_stabilization_version(),
++ name_upper = name_upper,
++ category = category,
++ )
++}
++
++fn create_lint_for_ty(lint: &LintData<'_>, enable_msrv: bool, ty: &str) -> io::Result<()> {
++ match ty {
++ "cargo" => assert_eq!(
++ lint.category, "cargo",
++ "Lints of type `cargo` must have the `cargo` category"
++ ),
++ _ if lint.category == "cargo" => panic!("Lints of category `cargo` must have the `cargo` type"),
++ _ => {},
++ }
++
++ let ty_dir = lint.project_root.join(format!("clippy_lints/src/{}", ty));
++ assert!(
++ ty_dir.exists() && ty_dir.is_dir(),
++ "Directory `{}` does not exist!",
++ ty_dir.display()
++ );
++
++ let lint_file_path = ty_dir.join(format!("{}.rs", lint.name));
++ assert!(
++ !lint_file_path.exists(),
++ "File `{}` already exists",
++ lint_file_path.display()
++ );
++
++ let mod_file_path = ty_dir.join("mod.rs");
++ let context_import = setup_mod_file(&mod_file_path, lint)?;
++
++ let name_upper = lint.name.to_uppercase();
++ let mut lint_file_contents = String::new();
++
++ if enable_msrv {
++ let _ = writedoc!(
++ lint_file_contents,
++ r#"
++ use clippy_utils::{{meets_msrv, msrvs}};
++ use rustc_lint::{{{context_import}, LintContext}};
++ use rustc_semver::RustcVersion;
++
++ use super::{name_upper};
++
++ // TODO: Adjust the parameters as necessary
++ pub(super) fn check(cx: &{context_import}, msrv: Option<RustcVersion>) {{
++ if !meets_msrv(msrv, todo!("Add a new entry in `clippy_utils/src/msrvs`")) {{
++ return;
++ }}
++ todo!();
++ }}
++ "#,
++ context_import = context_import,
++ name_upper = name_upper,
++ );
++ } else {
++ let _ = writedoc!(
++ lint_file_contents,
++ r#"
++ use rustc_lint::{{{context_import}, LintContext}};
++
++ use super::{name_upper};
++
++ // TODO: Adjust the parameters as necessary
++ pub(super) fn check(cx: &{context_import}) {{
++ todo!();
++ }}
++ "#,
++ context_import = context_import,
++ name_upper = name_upper,
++ );
++ }
++
++ write_file(lint_file_path.as_path(), lint_file_contents)?;
++ println!("Generated lint file: `clippy_lints/src/{}/{}.rs`", ty, lint.name);
++ println!(
++ "Be sure to add a call to `{}::check` in `clippy_lints/src/{}/mod.rs`!",
++ lint.name, ty
++ );
++
++ Ok(())
++}
++
++#[allow(clippy::too_many_lines)]
++fn setup_mod_file(path: &Path, lint: &LintData<'_>) -> io::Result<&'static str> {
++ use super::update_lints::{match_tokens, LintDeclSearchResult};
++ use rustc_lexer::TokenKind;
++
++ let lint_name_upper = lint.name.to_uppercase();
++
++ let mut file_contents = fs::read_to_string(path)?;
++ assert!(
++ !file_contents.contains(&lint_name_upper),
++ "Lint `{}` already defined in `{}`",
++ lint.name,
++ path.display()
++ );
++
++ let mut offset = 0usize;
++ let mut last_decl_curly_offset = None;
++ let mut lint_context = None;
++
++ let mut iter = rustc_lexer::tokenize(&file_contents).map(|t| {
++ let range = offset..offset + t.len;
++ offset = range.end;
++
++ LintDeclSearchResult {
++ token_kind: t.kind,
++ content: &file_contents[range.clone()],
++ range,
++ }
++ });
++
++ // Find both the last lint declaration (declare_clippy_lint!) and the lint pass impl
++ while let Some(LintDeclSearchResult { content, .. }) = iter.find(|result| result.token_kind == TokenKind::Ident) {
++ let mut iter = iter
++ .by_ref()
++ .filter(|t| !matches!(t.token_kind, TokenKind::Whitespace | TokenKind::LineComment { .. }));
++
++ match content {
++ "declare_clippy_lint" => {
++ // matches `!{`
++ match_tokens!(iter, Bang OpenBrace);
++ if let Some(LintDeclSearchResult { range, .. }) =
++ iter.find(|result| result.token_kind == TokenKind::CloseBrace)
++ {
++ last_decl_curly_offset = Some(range.end);
++ }
++ },
++ "impl" => {
++ let mut token = iter.next();
++ match token {
++ // matches <'foo>
++ Some(LintDeclSearchResult {
++ token_kind: TokenKind::Lt,
++ ..
++ }) => {
++ match_tokens!(iter, Lifetime { .. } Gt);
++ token = iter.next();
++ },
++ None => break,
++ _ => {},
++ }
++
++ if let Some(LintDeclSearchResult {
++ token_kind: TokenKind::Ident,
++ content,
++ ..
++ }) = token
++ {
++ // Get the appropriate lint context struct
++ lint_context = match content {
++ "LateLintPass" => Some("LateContext"),
++ "EarlyLintPass" => Some("EarlyContext"),
++ _ => continue,
++ };
++ }
++ },
++ _ => {},
++ }
++ }
++
++ drop(iter);
++
++ let last_decl_curly_offset =
++ last_decl_curly_offset.unwrap_or_else(|| panic!("No lint declarations found in `{}`", path.display()));
++ let lint_context =
++ lint_context.unwrap_or_else(|| panic!("No lint pass implementation found in `{}`", path.display()));
++
++ // Add the lint declaration to `mod.rs`
++ file_contents.replace_range(
++ // Remove the trailing newline, which should always be present
++ last_decl_curly_offset..=last_decl_curly_offset,
++ &format!("\n\n{}", get_lint_declaration(&lint_name_upper, lint.category)),
++ );
++
++ // Add the lint to `impl_lint_pass`/`declare_lint_pass`
++ let impl_lint_pass_start = file_contents.find("impl_lint_pass!").unwrap_or_else(|| {
++ file_contents
++ .find("declare_lint_pass!")
++ .unwrap_or_else(|| panic!("failed to find `impl_lint_pass`/`declare_lint_pass`"))
++ });
++
++ let mut arr_start = file_contents[impl_lint_pass_start..].find('[').unwrap_or_else(|| {
++ panic!("malformed `impl_lint_pass`/`declare_lint_pass`");
++ });
++
++ arr_start += impl_lint_pass_start;
++
++ let mut arr_end = file_contents[arr_start..]
++ .find(']')
++ .expect("failed to find `impl_lint_pass` terminator");
++
++ arr_end += arr_start;
++
++ let mut arr_content = file_contents[arr_start + 1..arr_end].to_string();
++ arr_content.retain(|c| !c.is_whitespace());
++
++ let mut new_arr_content = String::new();
++ for ident in arr_content
++ .split(',')
++ .chain(std::iter::once(&*lint_name_upper))
++ .filter(|s| !s.is_empty())
++ {
++ let _ = write!(new_arr_content, "\n {},", ident);
++ }
++ new_arr_content.push('\n');
++
++ file_contents.replace_range(arr_start + 1..arr_end, &new_arr_content);
++
++ // Just add the mod declaration at the top, it'll be fixed by rustfmt
++ file_contents.insert_str(0, &format!("mod {};\n", &lint.name));
++
++ let mut file = OpenOptions::new()
++ .write(true)
++ .truncate(true)
++ .open(path)
++ .context(format!("trying to open: `{}`", path.display()))?;
++ file.write_all(file_contents.as_bytes())
++ .context(format!("writing to file: `{}`", path.display()))?;
++
++ Ok(lint_context)
++}
++
+#[test]
+fn test_camel_case() {
+ let s = "a_lint";
+ let s2 = to_camel_case(s);
+ assert_eq!(s2, "ALint");
+
+ let name = "a_really_long_new_lint";
+ let name2 = to_camel_case(name);
+ assert_eq!(name2, "AReallyLongNewLint");
+
+ let name3 = "lint__name";
+ let name4 = to_camel_case(name3);
+ assert_eq!(name4, "LintName");
+}
--- /dev/null
- struct LintDeclSearchResult<'a> {
- token_kind: TokenKind,
- content: &'a str,
- range: Range<usize>,
+use crate::clippy_project_root;
+use aho_corasick::AhoCorasickBuilder;
+use indoc::writedoc;
+use itertools::Itertools;
+use rustc_lexer::{tokenize, unescape, LiteralKind, TokenKind};
+use std::collections::{HashMap, HashSet};
+use std::ffi::OsStr;
+use std::fmt::Write;
+use std::fs::{self, OpenOptions};
+use std::io::{self, Read, Seek, SeekFrom, Write as _};
+use std::ops::Range;
+use std::path::{Path, PathBuf};
+use walkdir::{DirEntry, WalkDir};
+
+const GENERATED_FILE_COMMENT: &str = "// This file was generated by `cargo dev update_lints`.\n\
+ // Use that command to update this file and do not edit by hand.\n\
+ // Manual edits will be overwritten.\n\n";
+
+const DOCS_LINK: &str = "https://rust-lang.github.io/rust-clippy/master/index.html";
+
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum UpdateMode {
+ Check,
+ Change,
+}
+
+/// Runs the `update_lints` command.
+///
+/// This updates various generated values from the lint source code.
+///
+/// `update_mode` indicates if the files should be updated or if updates should be checked for.
+///
+/// # Panics
+///
+/// Panics if a file path could not read from or then written to
+pub fn update(update_mode: UpdateMode) {
+ let (lints, deprecated_lints, renamed_lints) = gather_all();
+ generate_lint_files(update_mode, &lints, &deprecated_lints, &renamed_lints);
+}
+
+fn generate_lint_files(
+ update_mode: UpdateMode,
+ lints: &[Lint],
+ deprecated_lints: &[DeprecatedLint],
+ renamed_lints: &[RenamedLint],
+) {
+ let internal_lints = Lint::internal_lints(lints);
+ let usable_lints = Lint::usable_lints(lints);
+ let mut sorted_usable_lints = usable_lints.clone();
+ sorted_usable_lints.sort_by_key(|lint| lint.name.clone());
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("README.md"),
+ "[There are over ",
+ " lints included in this crate!]",
+ |res| {
+ write!(res, "{}", round_to_fifty(usable_lints.len())).unwrap();
+ },
+ );
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("book/src/README.md"),
+ "[There are over ",
+ " lints included in this crate!]",
+ |res| {
+ write!(res, "{}", round_to_fifty(usable_lints.len())).unwrap();
+ },
+ );
+
+ replace_region_in_file(
+ update_mode,
+ Path::new("CHANGELOG.md"),
+ "<!-- begin autogenerated links to lint list -->\n",
+ "<!-- end autogenerated links to lint list -->",
+ |res| {
+ for lint in usable_lints
+ .iter()
+ .map(|l| &*l.name)
+ .chain(deprecated_lints.iter().map(|l| &*l.name))
+ .chain(
+ renamed_lints
+ .iter()
+ .map(|l| l.old_name.strip_prefix("clippy::").unwrap_or(&l.old_name)),
+ )
+ .sorted()
+ {
+ writeln!(res, "[`{}`]: {}#{}", lint, DOCS_LINK, lint).unwrap();
+ }
+ },
+ );
+
+ // This has to be in lib.rs, otherwise rustfmt doesn't work
+ replace_region_in_file(
+ update_mode,
+ Path::new("clippy_lints/src/lib.rs"),
+ "// begin lints modules, do not remove this comment, it’s used in `update_lints`\n",
+ "// end lints modules, do not remove this comment, it’s used in `update_lints`",
+ |res| {
+ for lint_mod in usable_lints.iter().map(|l| &l.module).unique().sorted() {
+ writeln!(res, "mod {};", lint_mod).unwrap();
+ }
+ },
+ );
+
+ process_file(
+ "clippy_lints/src/lib.register_lints.rs",
+ update_mode,
+ &gen_register_lint_list(internal_lints.iter(), usable_lints.iter()),
+ );
+ process_file(
+ "clippy_lints/src/lib.deprecated.rs",
+ update_mode,
+ &gen_deprecated(deprecated_lints),
+ );
+
+ let all_group_lints = usable_lints.iter().filter(|l| {
+ matches!(
+ &*l.group,
+ "correctness" | "suspicious" | "style" | "complexity" | "perf"
+ )
+ });
+ let content = gen_lint_group_list("all", all_group_lints);
+ process_file("clippy_lints/src/lib.register_all.rs", update_mode, &content);
+
+ for (lint_group, lints) in Lint::by_lint_group(usable_lints.into_iter().chain(internal_lints)) {
+ let content = gen_lint_group_list(&lint_group, lints.iter());
+ process_file(
+ &format!("clippy_lints/src/lib.register_{}.rs", lint_group),
+ update_mode,
+ &content,
+ );
+ }
+
+ let content = gen_deprecated_lints_test(deprecated_lints);
+ process_file("tests/ui/deprecated.rs", update_mode, &content);
+
+ let content = gen_renamed_lints_test(renamed_lints);
+ process_file("tests/ui/rename.rs", update_mode, &content);
+}
+
+pub fn print_lints() {
+ let (lint_list, _, _) = gather_all();
+ let usable_lints = Lint::usable_lints(&lint_list);
+ let usable_lint_count = usable_lints.len();
+ let grouped_by_lint_group = Lint::by_lint_group(usable_lints.into_iter());
+
+ for (lint_group, mut lints) in grouped_by_lint_group {
+ println!("\n## {}", lint_group);
+
+ lints.sort_by_key(|l| l.name.clone());
+
+ for lint in lints {
+ println!("* [{}]({}#{}) ({})", lint.name, DOCS_LINK, lint.name, lint.desc);
+ }
+ }
+
+ println!("there are {} lints", usable_lint_count);
+}
+
+/// Runs the `rename_lint` command.
+///
+/// This does the following:
+/// * Adds an entry to `renamed_lints.rs`.
+/// * Renames all lint attributes to the new name (e.g. `#[allow(clippy::lint_name)]`).
+/// * Renames the lint struct to the new name.
+/// * Renames the module containing the lint struct to the new name if it shares a name with the
+/// lint.
+///
+/// # Panics
+/// Panics for the following conditions:
+/// * If a file path could not read from or then written to
+/// * If either lint name has a prefix
+/// * If `old_name` doesn't name an existing lint.
+/// * If `old_name` names a deprecated or renamed lint.
+#[allow(clippy::too_many_lines)]
+pub fn rename(old_name: &str, new_name: &str, uplift: bool) {
+ if let Some((prefix, _)) = old_name.split_once("::") {
+ panic!("`{}` should not contain the `{}` prefix", old_name, prefix);
+ }
+ if let Some((prefix, _)) = new_name.split_once("::") {
+ panic!("`{}` should not contain the `{}` prefix", new_name, prefix);
+ }
+
+ let (mut lints, deprecated_lints, mut renamed_lints) = gather_all();
+ let mut old_lint_index = None;
+ let mut found_new_name = false;
+ for (i, lint) in lints.iter().enumerate() {
+ if lint.name == old_name {
+ old_lint_index = Some(i);
+ } else if lint.name == new_name {
+ found_new_name = true;
+ }
+ }
+ let old_lint_index = old_lint_index.unwrap_or_else(|| panic!("could not find lint `{}`", old_name));
+
+ let lint = RenamedLint {
+ old_name: format!("clippy::{}", old_name),
+ new_name: if uplift {
+ new_name.into()
+ } else {
+ format!("clippy::{}", new_name)
+ },
+ };
+
+ // Renamed lints and deprecated lints shouldn't have been found in the lint list, but check just in
+ // case.
+ assert!(
+ !renamed_lints.iter().any(|l| lint.old_name == l.old_name),
+ "`{}` has already been renamed",
+ old_name
+ );
+ assert!(
+ !deprecated_lints.iter().any(|l| lint.old_name == l.name),
+ "`{}` has already been deprecated",
+ old_name
+ );
+
+ // Update all lint level attributes. (`clippy::lint_name`)
+ for file in WalkDir::new(clippy_project_root())
+ .into_iter()
+ .map(Result::unwrap)
+ .filter(|f| {
+ let name = f.path().file_name();
+ let ext = f.path().extension();
+ (ext == Some(OsStr::new("rs")) || ext == Some(OsStr::new("fixed")))
+ && name != Some(OsStr::new("rename.rs"))
+ && name != Some(OsStr::new("renamed_lints.rs"))
+ })
+ {
+ rewrite_file(file.path(), |s| {
+ replace_ident_like(s, &[(&lint.old_name, &lint.new_name)])
+ });
+ }
+
+ renamed_lints.push(lint);
+ renamed_lints.sort_by(|lhs, rhs| {
+ lhs.new_name
+ .starts_with("clippy::")
+ .cmp(&rhs.new_name.starts_with("clippy::"))
+ .reverse()
+ .then_with(|| lhs.old_name.cmp(&rhs.old_name))
+ });
+
+ write_file(
+ Path::new("clippy_lints/src/renamed_lints.rs"),
+ &gen_renamed_lints_list(&renamed_lints),
+ );
+
+ if uplift {
+ write_file(Path::new("tests/ui/rename.rs"), &gen_renamed_lints_test(&renamed_lints));
+ println!(
+ "`{}` has be uplifted. All the code inside `clippy_lints` related to it needs to be removed manually.",
+ old_name
+ );
+ } else if found_new_name {
+ write_file(Path::new("tests/ui/rename.rs"), &gen_renamed_lints_test(&renamed_lints));
+ println!(
+ "`{}` is already defined. The old linting code inside `clippy_lints` needs to be updated/removed manually.",
+ new_name
+ );
+ } else {
+ // Rename the lint struct and source files sharing a name with the lint.
+ let lint = &mut lints[old_lint_index];
+ let old_name_upper = old_name.to_uppercase();
+ let new_name_upper = new_name.to_uppercase();
+ lint.name = new_name.into();
+
+ // Rename test files. only rename `.stderr` and `.fixed` files if the new test name doesn't exist.
+ if try_rename_file(
+ Path::new(&format!("tests/ui/{}.rs", old_name)),
+ Path::new(&format!("tests/ui/{}.rs", new_name)),
+ ) {
+ try_rename_file(
+ Path::new(&format!("tests/ui/{}.stderr", old_name)),
+ Path::new(&format!("tests/ui/{}.stderr", new_name)),
+ );
+ try_rename_file(
+ Path::new(&format!("tests/ui/{}.fixed", old_name)),
+ Path::new(&format!("tests/ui/{}.fixed", new_name)),
+ );
+ }
+
+ // Try to rename the file containing the lint if the file name matches the lint's name.
+ let replacements;
+ let replacements = if lint.module == old_name
+ && try_rename_file(
+ Path::new(&format!("clippy_lints/src/{}.rs", old_name)),
+ Path::new(&format!("clippy_lints/src/{}.rs", new_name)),
+ ) {
+ // Edit the module name in the lint list. Note there could be multiple lints.
+ for lint in lints.iter_mut().filter(|l| l.module == old_name) {
+ lint.module = new_name.into();
+ }
+ replacements = [(&*old_name_upper, &*new_name_upper), (old_name, new_name)];
+ replacements.as_slice()
+ } else if !lint.module.contains("::")
+ // Catch cases like `methods/lint_name.rs` where the lint is stored in `methods/mod.rs`
+ && try_rename_file(
+ Path::new(&format!("clippy_lints/src/{}/{}.rs", lint.module, old_name)),
+ Path::new(&format!("clippy_lints/src/{}/{}.rs", lint.module, new_name)),
+ )
+ {
+ // Edit the module name in the lint list. Note there could be multiple lints, or none.
+ let renamed_mod = format!("{}::{}", lint.module, old_name);
+ for lint in lints.iter_mut().filter(|l| l.module == renamed_mod) {
+ lint.module = format!("{}::{}", lint.module, new_name);
+ }
+ replacements = [(&*old_name_upper, &*new_name_upper), (old_name, new_name)];
+ replacements.as_slice()
+ } else {
+ replacements = [(&*old_name_upper, &*new_name_upper), ("", "")];
+ &replacements[0..1]
+ };
+
+ // Don't change `clippy_utils/src/renamed_lints.rs` here as it would try to edit the lint being
+ // renamed.
+ for (_, file) in clippy_lints_src_files().filter(|(rel_path, _)| rel_path != OsStr::new("renamed_lints.rs")) {
+ rewrite_file(file.path(), |s| replace_ident_like(s, replacements));
+ }
+
+ generate_lint_files(UpdateMode::Change, &lints, &deprecated_lints, &renamed_lints);
+ println!("{} has been successfully renamed", old_name);
+ }
+
+ println!("note: `cargo uitest` still needs to be run to update the test results");
+}
+
+const DEFAULT_DEPRECATION_REASON: &str = "default deprecation note";
+/// Runs the `deprecate` command
+///
+/// This does the following:
+/// * Adds an entry to `deprecated_lints.rs`.
+/// * Removes the lint declaration (and the entire file if applicable)
+///
+/// # Panics
+///
+/// If a file path could not read from or written to
+pub fn deprecate(name: &str, reason: Option<&String>) {
+ fn finish(
+ (lints, mut deprecated_lints, renamed_lints): (Vec<Lint>, Vec<DeprecatedLint>, Vec<RenamedLint>),
+ name: &str,
+ reason: &str,
+ ) {
+ deprecated_lints.push(DeprecatedLint {
+ name: name.to_string(),
+ reason: reason.to_string(),
+ declaration_range: Range::default(),
+ });
+
+ generate_lint_files(UpdateMode::Change, &lints, &deprecated_lints, &renamed_lints);
+ println!("info: `{}` has successfully been deprecated", name);
+
+ if reason == DEFAULT_DEPRECATION_REASON {
+ println!("note: the deprecation reason must be updated in `clippy_lints/src/deprecated_lints.rs`");
+ }
+ println!("note: you must run `cargo uitest` to update the test results");
+ }
+
+ let reason = reason.map_or(DEFAULT_DEPRECATION_REASON, String::as_str);
+ let name_lower = name.to_lowercase();
+ let name_upper = name.to_uppercase();
+
+ let (mut lints, deprecated_lints, renamed_lints) = gather_all();
+ let Some(lint) = lints.iter().find(|l| l.name == name_lower) else { eprintln!("error: failed to find lint `{}`", name); return; };
+
+ let mod_path = {
+ let mut mod_path = PathBuf::from(format!("clippy_lints/src/{}", lint.module));
+ if mod_path.is_dir() {
+ mod_path = mod_path.join("mod");
+ }
+
+ mod_path.set_extension("rs");
+ mod_path
+ };
+
+ let deprecated_lints_path = &*clippy_project_root().join("clippy_lints/src/deprecated_lints.rs");
+
+ if remove_lint_declaration(&name_lower, &mod_path, &mut lints).unwrap_or(false) {
+ declare_deprecated(&name_upper, deprecated_lints_path, reason).unwrap();
+ finish((lints, deprecated_lints, renamed_lints), name, reason);
+ return;
+ }
+
+ eprintln!("error: lint not found");
+}
+
+fn remove_lint_declaration(name: &str, path: &Path, lints: &mut Vec<Lint>) -> io::Result<bool> {
+ fn remove_lint(name: &str, lints: &mut Vec<Lint>) {
+ lints.iter().position(|l| l.name == name).map(|pos| lints.remove(pos));
+ }
+
+ fn remove_test_assets(name: &str) {
+ let test_file_stem = format!("tests/ui/{}", name);
+ let path = Path::new(&test_file_stem);
+
+ // Some lints have their own directories, delete them
+ if path.is_dir() {
+ fs::remove_dir_all(path).ok();
+ return;
+ }
+
+ // Remove all related test files
+ fs::remove_file(path.with_extension("rs")).ok();
+ fs::remove_file(path.with_extension("stderr")).ok();
+ fs::remove_file(path.with_extension("fixed")).ok();
+ }
+
+ fn remove_impl_lint_pass(lint_name_upper: &str, content: &mut String) {
+ let impl_lint_pass_start = content.find("impl_lint_pass!").unwrap_or_else(|| {
+ content
+ .find("declare_lint_pass!")
+ .unwrap_or_else(|| panic!("failed to find `impl_lint_pass`"))
+ });
+ let mut impl_lint_pass_end = content[impl_lint_pass_start..]
+ .find(']')
+ .expect("failed to find `impl_lint_pass` terminator");
+
+ impl_lint_pass_end += impl_lint_pass_start;
+ if let Some(lint_name_pos) = content[impl_lint_pass_start..impl_lint_pass_end].find(&lint_name_upper) {
+ let mut lint_name_end = impl_lint_pass_start + (lint_name_pos + lint_name_upper.len());
+ for c in content[lint_name_end..impl_lint_pass_end].chars() {
+ // Remove trailing whitespace
+ if c == ',' || c.is_whitespace() {
+ lint_name_end += 1;
+ } else {
+ break;
+ }
+ }
+
+ content.replace_range(impl_lint_pass_start + lint_name_pos..lint_name_end, "");
+ }
+ }
+
+ if path.exists() {
+ if let Some(lint) = lints.iter().find(|l| l.name == name) {
+ if lint.module == name {
+ // The lint name is the same as the file, we can just delete the entire file
+ fs::remove_file(path)?;
+ } else {
+ // We can't delete the entire file, just remove the declaration
+
+ if let Some(Some("mod.rs")) = path.file_name().map(OsStr::to_str) {
+ // Remove clippy_lints/src/some_mod/some_lint.rs
+ let mut lint_mod_path = path.to_path_buf();
+ lint_mod_path.set_file_name(name);
+ lint_mod_path.set_extension("rs");
+
+ fs::remove_file(lint_mod_path).ok();
+ }
+
+ let mut content =
+ fs::read_to_string(&path).unwrap_or_else(|_| panic!("failed to read `{}`", path.to_string_lossy()));
+
+ eprintln!(
+ "warn: you will have to manually remove any code related to `{}` from `{}`",
+ name,
+ path.display()
+ );
+
+ assert!(
+ content[lint.declaration_range.clone()].contains(&name.to_uppercase()),
+ "error: `{}` does not contain lint `{}`'s declaration",
+ path.display(),
+ lint.name
+ );
+
+ // Remove lint declaration (declare_clippy_lint!)
+ content.replace_range(lint.declaration_range.clone(), "");
+
+ // Remove the module declaration (mod xyz;)
+ let mod_decl = format!("\nmod {};", name);
+ content = content.replacen(&mod_decl, "", 1);
+
+ remove_impl_lint_pass(&lint.name.to_uppercase(), &mut content);
+ fs::write(path, content).unwrap_or_else(|_| panic!("failed to write to `{}`", path.to_string_lossy()));
+ }
+
+ remove_test_assets(name);
+ remove_lint(name, lints);
+ return Ok(true);
+ }
+ }
+
+ Ok(false)
+}
+
+fn declare_deprecated(name: &str, path: &Path, reason: &str) -> io::Result<()> {
+ let mut file = OpenOptions::new().write(true).open(path)?;
+
+ file.seek(SeekFrom::End(0))?;
+
+ let version = crate::new_lint::get_stabilization_version();
+ let deprecation_reason = if reason == DEFAULT_DEPRECATION_REASON {
+ "TODO"
+ } else {
+ reason
+ };
+
+ writedoc!(
+ file,
+ "
+
+ declare_deprecated_lint! {{
+ /// ### What it does
+ /// Nothing. This lint has been deprecated.
+ ///
+ /// ### Deprecation reason
+ /// {}
+ #[clippy::version = \"{}\"]
+ pub {},
+ \"{}\"
+ }}
+
+ ",
+ deprecation_reason,
+ version,
+ name,
+ reason,
+ )
+}
+
+/// Replace substrings if they aren't bordered by identifier characters. Returns `None` if there
+/// were no replacements.
+fn replace_ident_like(contents: &str, replacements: &[(&str, &str)]) -> Option<String> {
+ fn is_ident_char(c: u8) -> bool {
+ matches!(c, b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9' | b'_')
+ }
+
+ let searcher = AhoCorasickBuilder::new()
+ .dfa(true)
+ .match_kind(aho_corasick::MatchKind::LeftmostLongest)
+ .build_with_size::<u16, _, _>(replacements.iter().map(|&(x, _)| x.as_bytes()))
+ .unwrap();
+
+ let mut result = String::with_capacity(contents.len() + 1024);
+ let mut pos = 0;
+ let mut edited = false;
+ for m in searcher.find_iter(contents) {
+ let (old, new) = replacements[m.pattern()];
+ result.push_str(&contents[pos..m.start()]);
+ result.push_str(
+ if !is_ident_char(contents.as_bytes().get(m.start().wrapping_sub(1)).copied().unwrap_or(0))
+ && !is_ident_char(contents.as_bytes().get(m.end()).copied().unwrap_or(0))
+ {
+ edited = true;
+ new
+ } else {
+ old
+ },
+ );
+ pos = m.end();
+ }
+ result.push_str(&contents[pos..]);
+ edited.then_some(result)
+}
+
+fn round_to_fifty(count: usize) -> usize {
+ count / 50 * 50
+}
+
+fn process_file(path: impl AsRef<Path>, update_mode: UpdateMode, content: &str) {
+ if update_mode == UpdateMode::Check {
+ let old_content =
+ fs::read_to_string(&path).unwrap_or_else(|e| panic!("Cannot read from {}: {}", path.as_ref().display(), e));
+ if content != old_content {
+ exit_with_failure();
+ }
+ } else {
+ fs::write(&path, content.as_bytes())
+ .unwrap_or_else(|e| panic!("Cannot write to {}: {}", path.as_ref().display(), e));
+ }
+}
+
+fn exit_with_failure() {
+ println!(
+ "Not all lints defined properly. \
+ Please run `cargo dev update_lints` to make sure all lints are defined properly."
+ );
+ std::process::exit(1);
+}
+
+/// Lint data parsed from the Clippy source code.
+#[derive(Clone, PartialEq, Eq, Debug)]
+struct Lint {
+ name: String,
+ group: String,
+ desc: String,
+ module: String,
+ declaration_range: Range<usize>,
+}
+
+impl Lint {
+ #[must_use]
+ fn new(name: &str, group: &str, desc: &str, module: &str, declaration_range: Range<usize>) -> Self {
+ Self {
+ name: name.to_lowercase(),
+ group: group.into(),
+ desc: remove_line_splices(desc),
+ module: module.into(),
+ declaration_range,
+ }
+ }
+
+ /// Returns all non-deprecated lints and non-internal lints
+ #[must_use]
+ fn usable_lints(lints: &[Self]) -> Vec<Self> {
+ lints
+ .iter()
+ .filter(|l| !l.group.starts_with("internal"))
+ .cloned()
+ .collect()
+ }
+
+ /// Returns all internal lints (not `internal_warn` lints)
+ #[must_use]
+ fn internal_lints(lints: &[Self]) -> Vec<Self> {
+ lints.iter().filter(|l| l.group == "internal").cloned().collect()
+ }
+
+ /// Returns the lints in a `HashMap`, grouped by the different lint groups
+ #[must_use]
+ fn by_lint_group(lints: impl Iterator<Item = Self>) -> HashMap<String, Vec<Self>> {
+ lints.map(|lint| (lint.group.to_string(), lint)).into_group_map()
+ }
+}
+
+#[derive(Clone, PartialEq, Eq, Debug)]
+struct DeprecatedLint {
+ name: String,
+ reason: String,
+ declaration_range: Range<usize>,
+}
+impl DeprecatedLint {
+ fn new(name: &str, reason: &str, declaration_range: Range<usize>) -> Self {
+ Self {
+ name: name.to_lowercase(),
+ reason: remove_line_splices(reason),
+ declaration_range,
+ }
+ }
+}
+
+struct RenamedLint {
+ old_name: String,
+ new_name: String,
+}
+impl RenamedLint {
+ fn new(old_name: &str, new_name: &str) -> Self {
+ Self {
+ old_name: remove_line_splices(old_name),
+ new_name: remove_line_splices(new_name),
+ }
+ }
+}
+
+/// Generates the code for registering a group
+fn gen_lint_group_list<'a>(group_name: &str, lints: impl Iterator<Item = &'a Lint>) -> String {
+ let mut details: Vec<_> = lints.map(|l| (&l.module, l.name.to_uppercase())).collect();
+ details.sort_unstable();
+
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+
+ let _ = writeln!(
+ output,
+ "store.register_group(true, \"clippy::{0}\", Some(\"clippy_{0}\"), vec![",
+ group_name
+ );
+ for (module, name) in details {
+ let _ = writeln!(output, " LintId::of({}::{}),", module, name);
+ }
+ output.push_str("])\n");
+
+ output
+}
+
+/// Generates the `register_removed` code
+#[must_use]
+fn gen_deprecated(lints: &[DeprecatedLint]) -> String {
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+ output.push_str("{\n");
+ for lint in lints {
+ let _ = write!(
+ output,
+ concat!(
+ " store.register_removed(\n",
+ " \"clippy::{}\",\n",
+ " \"{}\",\n",
+ " );\n"
+ ),
+ lint.name, lint.reason,
+ );
+ }
+ output.push_str("}\n");
+
+ output
+}
+
+/// Generates the code for registering lints
+#[must_use]
+fn gen_register_lint_list<'a>(
+ internal_lints: impl Iterator<Item = &'a Lint>,
+ usable_lints: impl Iterator<Item = &'a Lint>,
+) -> String {
+ let mut details: Vec<_> = internal_lints
+ .map(|l| (false, &l.module, l.name.to_uppercase()))
+ .chain(usable_lints.map(|l| (true, &l.module, l.name.to_uppercase())))
+ .collect();
+ details.sort_unstable();
+
+ let mut output = GENERATED_FILE_COMMENT.to_string();
+ output.push_str("store.register_lints(&[\n");
+
+ for (is_public, module_name, lint_name) in details {
+ if !is_public {
+ output.push_str(" #[cfg(feature = \"internal\")]\n");
+ }
+ let _ = writeln!(output, " {}::{},", module_name, lint_name);
+ }
+ output.push_str("])\n");
+
+ output
+}
+
+fn gen_deprecated_lints_test(lints: &[DeprecatedLint]) -> String {
+ let mut res: String = GENERATED_FILE_COMMENT.into();
+ for lint in lints {
+ writeln!(res, "#![warn(clippy::{})]", lint.name).unwrap();
+ }
+ res.push_str("\nfn main() {}\n");
+ res
+}
+
+fn gen_renamed_lints_test(lints: &[RenamedLint]) -> String {
+ let mut seen_lints = HashSet::new();
+ let mut res: String = GENERATED_FILE_COMMENT.into();
+ res.push_str("// run-rustfix\n\n");
+ for lint in lints {
+ if seen_lints.insert(&lint.new_name) {
+ writeln!(res, "#![allow({})]", lint.new_name).unwrap();
+ }
+ }
+ seen_lints.clear();
+ for lint in lints {
+ if seen_lints.insert(&lint.old_name) {
+ writeln!(res, "#![warn({})]", lint.old_name).unwrap();
+ }
+ }
+ res.push_str("\nfn main() {}\n");
+ res
+}
+
+fn gen_renamed_lints_list(lints: &[RenamedLint]) -> String {
+ const HEADER: &str = "\
+ // This file is managed by `cargo dev rename_lint`. Prefer using that when possible.\n\n\
+ #[rustfmt::skip]\n\
+ pub static RENAMED_LINTS: &[(&str, &str)] = &[\n";
+
+ let mut res = String::from(HEADER);
+ for lint in lints {
+ writeln!(res, " (\"{}\", \"{}\"),", lint.old_name, lint.new_name).unwrap();
+ }
+ res.push_str("];\n");
+ res
+}
+
+/// Gathers all lints defined in `clippy_lints/src`
+fn gather_all() -> (Vec<Lint>, Vec<DeprecatedLint>, Vec<RenamedLint>) {
+ let mut lints = Vec::with_capacity(1000);
+ let mut deprecated_lints = Vec::with_capacity(50);
+ let mut renamed_lints = Vec::with_capacity(50);
+
+ for (rel_path, file) in clippy_lints_src_files() {
+ let path = file.path();
+ let contents =
+ fs::read_to_string(path).unwrap_or_else(|e| panic!("Cannot read from `{}`: {}", path.display(), e));
+ let module = rel_path
+ .components()
+ .map(|c| c.as_os_str().to_str().unwrap())
+ .collect::<Vec<_>>()
+ .join("::");
+
+ // If the lints are stored in mod.rs, we get the module name from
+ // the containing directory:
+ let module = if let Some(module) = module.strip_suffix("::mod.rs") {
+ module
+ } else {
+ module.strip_suffix(".rs").unwrap_or(&module)
+ };
+
+ match module {
+ "deprecated_lints" => parse_deprecated_contents(&contents, &mut deprecated_lints),
+ "renamed_lints" => parse_renamed_contents(&contents, &mut renamed_lints),
+ _ => parse_contents(&contents, module, &mut lints),
+ }
+ }
+ (lints, deprecated_lints, renamed_lints)
+}
+
+fn clippy_lints_src_files() -> impl Iterator<Item = (PathBuf, DirEntry)> {
+ let root_path = clippy_project_root().join("clippy_lints/src");
+ let iter = WalkDir::new(&root_path).into_iter();
+ iter.map(Result::unwrap)
+ .filter(|f| f.path().extension() == Some(OsStr::new("rs")))
+ .map(move |f| (f.path().strip_prefix(&root_path).unwrap().to_path_buf(), f))
+}
+
+macro_rules! match_tokens {
+ ($iter:ident, $($token:ident $({$($fields:tt)*})? $(($capture:ident))?)*) => {
+ {
+ $($(let $capture =)? if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::$token $({$($fields)*})?,
+ content: _x,
+ ..
+ }) = $iter.next() {
+ _x
+ } else {
+ continue;
+ };)*
+ #[allow(clippy::unused_unit)]
+ { ($($($capture,)?)*) }
+ }
+ }
+}
+
++pub(crate) use match_tokens;
++
++pub(crate) struct LintDeclSearchResult<'a> {
++ pub token_kind: TokenKind,
++ pub content: &'a str,
++ pub range: Range<usize>,
+}
+
+/// Parse a source file looking for `declare_clippy_lint` macro invocations.
+fn parse_contents(contents: &str, module: &str, lints: &mut Vec<Lint>) {
+ let mut offset = 0usize;
+ let mut iter = tokenize(contents).map(|t| {
+ let range = offset..offset + t.len;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_clippy_lint",
+ ) {
+ let start = range.start;
+
+ let mut iter = iter
+ .by_ref()
+ .filter(|t| !matches!(t.token_kind, TokenKind::Whitespace | TokenKind::LineComment { .. }));
+ // matches `!{`
+ match_tokens!(iter, Bang OpenBrace);
+ match iter.next() {
+ // #[clippy::version = "version"] pub
+ Some(LintDeclSearchResult {
+ token_kind: TokenKind::Pound,
+ ..
+ }) => {
+ match_tokens!(iter, OpenBracket Ident Colon Colon Ident Eq Literal{..} CloseBracket Ident);
+ },
+ // pub
+ Some(LintDeclSearchResult {
+ token_kind: TokenKind::Ident,
+ ..
+ }) => (),
+ _ => continue,
+ }
+
+ let (name, group, desc) = match_tokens!(
+ iter,
+ // LINT_NAME
+ Ident(name) Comma
+ // group,
+ Ident(group) Comma
+ // "description"
+ Literal{..}(desc)
+ );
+
+ if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::CloseBrace,
+ range,
+ ..
+ }) = iter.next()
+ {
+ lints.push(Lint::new(name, group, desc, module, start..range.end));
+ }
+ }
+}
+
+/// Parse a source file looking for `declare_deprecated_lint` macro invocations.
+fn parse_deprecated_contents(contents: &str, lints: &mut Vec<DeprecatedLint>) {
+ let mut offset = 0usize;
+ let mut iter = tokenize(contents).map(|t| {
+ let range = offset..offset + t.len;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_deprecated_lint",
+ ) {
+ let start = range.start;
+
+ let mut iter = iter.by_ref().filter(|LintDeclSearchResult { ref token_kind, .. }| {
+ !matches!(token_kind, TokenKind::Whitespace | TokenKind::LineComment { .. })
+ });
+ let (name, reason) = match_tokens!(
+ iter,
+ // !{
+ Bang OpenBrace
+ // #[clippy::version = "version"]
+ Pound OpenBracket Ident Colon Colon Ident Eq Literal{..} CloseBracket
+ // pub LINT_NAME,
+ Ident Ident(name) Comma
+ // "description"
+ Literal{kind: LiteralKind::Str{..},..}(reason)
+ );
+
+ if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::CloseBrace,
+ range,
+ ..
+ }) = iter.next()
+ {
+ lints.push(DeprecatedLint::new(name, reason, start..range.end));
+ }
+ }
+}
+
+fn parse_renamed_contents(contents: &str, lints: &mut Vec<RenamedLint>) {
+ for line in contents.lines() {
+ let mut offset = 0usize;
+ let mut iter = tokenize(line).map(|t| {
+ let range = offset..offset + t.len;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &line[range.clone()],
+ range,
+ }
+ });
+
+ let (old_name, new_name) = match_tokens!(
+ iter,
+ // ("old_name",
+ Whitespace OpenParen Literal{kind: LiteralKind::Str{..},..}(old_name) Comma
+ // "new_name"),
+ Whitespace Literal{kind: LiteralKind::Str{..},..}(new_name) CloseParen Comma
+ );
+ lints.push(RenamedLint::new(old_name, new_name));
+ }
+}
+
+/// Removes the line splices and surrounding quotes from a string literal
+fn remove_line_splices(s: &str) -> String {
+ let s = s
+ .strip_prefix('r')
+ .unwrap_or(s)
+ .trim_matches('#')
+ .strip_prefix('"')
+ .and_then(|s| s.strip_suffix('"'))
+ .unwrap_or_else(|| panic!("expected quoted string, found `{}`", s));
+ let mut res = String::with_capacity(s.len());
+ unescape::unescape_literal(s, unescape::Mode::Str, &mut |range, _| res.push_str(&s[range]));
+ res
+}
+
+/// Replaces a region in a file delimited by two lines matching regexes.
+///
+/// `path` is the relative path to the file on which you want to perform the replacement.
+///
+/// See `replace_region_in_text` for documentation of the other options.
+///
+/// # Panics
+///
+/// Panics if the path could not read or then written
+fn replace_region_in_file(
+ update_mode: UpdateMode,
+ path: &Path,
+ start: &str,
+ end: &str,
+ write_replacement: impl FnMut(&mut String),
+) {
+ let contents = fs::read_to_string(path).unwrap_or_else(|e| panic!("Cannot read from `{}`: {}", path.display(), e));
+ let new_contents = match replace_region_in_text(&contents, start, end, write_replacement) {
+ Ok(x) => x,
+ Err(delim) => panic!("Couldn't find `{}` in file `{}`", delim, path.display()),
+ };
+
+ match update_mode {
+ UpdateMode::Check if contents != new_contents => exit_with_failure(),
+ UpdateMode::Check => (),
+ UpdateMode::Change => {
+ if let Err(e) = fs::write(path, new_contents.as_bytes()) {
+ panic!("Cannot write to `{}`: {}", path.display(), e);
+ }
+ },
+ }
+}
+
+/// Replaces a region in a text delimited by two strings. Returns the new text if both delimiters
+/// were found, or the missing delimiter if not.
+fn replace_region_in_text<'a>(
+ text: &str,
+ start: &'a str,
+ end: &'a str,
+ mut write_replacement: impl FnMut(&mut String),
+) -> Result<String, &'a str> {
+ let (text_start, rest) = text.split_once(start).ok_or(start)?;
+ let (_, text_end) = rest.split_once(end).ok_or(end)?;
+
+ let mut res = String::with_capacity(text.len() + 4096);
+ res.push_str(text_start);
+ res.push_str(start);
+ write_replacement(&mut res);
+ res.push_str(end);
+ res.push_str(text_end);
+
+ Ok(res)
+}
+
+fn try_rename_file(old_name: &Path, new_name: &Path) -> bool {
+ match fs::OpenOptions::new().create_new(true).write(true).open(new_name) {
+ Ok(file) => drop(file),
+ Err(e) if matches!(e.kind(), io::ErrorKind::AlreadyExists | io::ErrorKind::NotFound) => return false,
+ Err(e) => panic_file(e, new_name, "create"),
+ };
+ match fs::rename(old_name, new_name) {
+ Ok(()) => true,
+ Err(e) => {
+ drop(fs::remove_file(new_name));
+ if e.kind() == io::ErrorKind::NotFound {
+ false
+ } else {
+ panic_file(e, old_name, "rename");
+ }
+ },
+ }
+}
+
+#[allow(clippy::needless_pass_by_value)]
+fn panic_file(error: io::Error, name: &Path, action: &str) -> ! {
+ panic!("failed to {} file `{}`: {}", action, name.display(), error)
+}
+
+fn rewrite_file(path: &Path, f: impl FnOnce(&str) -> Option<String>) {
+ let mut file = fs::OpenOptions::new()
+ .write(true)
+ .read(true)
+ .open(path)
+ .unwrap_or_else(|e| panic_file(e, path, "open"));
+ let mut buf = String::new();
+ file.read_to_string(&mut buf)
+ .unwrap_or_else(|e| panic_file(e, path, "read"));
+ if let Some(new_contents) = f(&buf) {
+ file.rewind().unwrap_or_else(|e| panic_file(e, path, "write"));
+ file.write_all(new_contents.as_bytes())
+ .unwrap_or_else(|e| panic_file(e, path, "write"));
+ file.set_len(new_contents.len() as u64)
+ .unwrap_or_else(|e| panic_file(e, path, "write"));
+ }
+}
+
+fn write_file(path: &Path, contents: &str) {
+ fs::write(path, contents).unwrap_or_else(|e| panic_file(e, path, "write"));
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_parse_contents() {
+ static CONTENTS: &str = r#"
+ declare_clippy_lint! {
+ #[clippy::version = "Hello Clippy!"]
+ pub PTR_ARG,
+ style,
+ "really long \
+ text"
+ }
+
+ declare_clippy_lint!{
+ #[clippy::version = "Test version"]
+ pub DOC_MARKDOWN,
+ pedantic,
+ "single line"
+ }
+ "#;
+ let mut result = Vec::new();
+ parse_contents(CONTENTS, "module_name", &mut result);
+ for r in &mut result {
+ r.declaration_range = Range::default();
+ }
+
+ let expected = vec![
+ Lint::new(
+ "ptr_arg",
+ "style",
+ "\"really long text\"",
+ "module_name",
+ Range::default(),
+ ),
+ Lint::new(
+ "doc_markdown",
+ "pedantic",
+ "\"single line\"",
+ "module_name",
+ Range::default(),
+ ),
+ ];
+ assert_eq!(expected, result);
+ }
+
+ #[test]
+ fn test_parse_deprecated_contents() {
+ static DEPRECATED_CONTENTS: &str = r#"
+ /// some doc comment
+ declare_deprecated_lint! {
+ #[clippy::version = "I'm a version"]
+ pub SHOULD_ASSERT_EQ,
+ "`assert!()` will be more flexible with RFC 2011"
+ }
+ "#;
+
+ let mut result = Vec::new();
+ parse_deprecated_contents(DEPRECATED_CONTENTS, &mut result);
+ for r in &mut result {
+ r.declaration_range = Range::default();
+ }
+
+ let expected = vec![DeprecatedLint::new(
+ "should_assert_eq",
+ "\"`assert!()` will be more flexible with RFC 2011\"",
+ Range::default(),
+ )];
+ assert_eq!(expected, result);
+ }
+
+ #[test]
+ fn test_usable_lints() {
+ let lints = vec![
+ Lint::new(
+ "should_assert_eq2",
+ "Not Deprecated",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ ),
+ Lint::new(
+ "should_assert_eq2",
+ "internal",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ ),
+ Lint::new(
+ "should_assert_eq2",
+ "internal_style",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ ),
+ ];
+ let expected = vec![Lint::new(
+ "should_assert_eq2",
+ "Not Deprecated",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ )];
+ assert_eq!(expected, Lint::usable_lints(&lints));
+ }
+
+ #[test]
+ fn test_by_lint_group() {
+ let lints = vec![
+ Lint::new("should_assert_eq", "group1", "\"abc\"", "module_name", Range::default()),
+ Lint::new(
+ "should_assert_eq2",
+ "group2",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ ),
+ Lint::new("incorrect_match", "group1", "\"abc\"", "module_name", Range::default()),
+ ];
+ let mut expected: HashMap<String, Vec<Lint>> = HashMap::new();
+ expected.insert(
+ "group1".to_string(),
+ vec![
+ Lint::new("should_assert_eq", "group1", "\"abc\"", "module_name", Range::default()),
+ Lint::new("incorrect_match", "group1", "\"abc\"", "module_name", Range::default()),
+ ],
+ );
+ expected.insert(
+ "group2".to_string(),
+ vec![Lint::new(
+ "should_assert_eq2",
+ "group2",
+ "\"abc\"",
+ "module_name",
+ Range::default(),
+ )],
+ );
+ assert_eq!(expected, Lint::by_lint_group(lints.into_iter()));
+ }
+
+ #[test]
+ fn test_gen_deprecated() {
+ let lints = vec![
+ DeprecatedLint::new(
+ "should_assert_eq",
+ "\"has been superseded by should_assert_eq2\"",
+ Range::default(),
+ ),
+ DeprecatedLint::new("another_deprecated", "\"will be removed\"", Range::default()),
+ ];
+
+ let expected = GENERATED_FILE_COMMENT.to_string()
+ + &[
+ "{",
+ " store.register_removed(",
+ " \"clippy::should_assert_eq\",",
+ " \"has been superseded by should_assert_eq2\",",
+ " );",
+ " store.register_removed(",
+ " \"clippy::another_deprecated\",",
+ " \"will be removed\",",
+ " );",
+ "}",
+ ]
+ .join("\n")
+ + "\n";
+
+ assert_eq!(expected, gen_deprecated(&lints));
+ }
+
+ #[test]
+ fn test_gen_lint_group_list() {
+ let lints = vec![
+ Lint::new("abc", "group1", "\"abc\"", "module_name", Range::default()),
+ Lint::new("should_assert_eq", "group1", "\"abc\"", "module_name", Range::default()),
+ Lint::new("internal", "internal_style", "\"abc\"", "module_name", Range::default()),
+ ];
+ let expected = GENERATED_FILE_COMMENT.to_string()
+ + &[
+ "store.register_group(true, \"clippy::group1\", Some(\"clippy_group1\"), vec![",
+ " LintId::of(module_name::ABC),",
+ " LintId::of(module_name::INTERNAL),",
+ " LintId::of(module_name::SHOULD_ASSERT_EQ),",
+ "])",
+ ]
+ .join("\n")
+ + "\n";
+
+ let result = gen_lint_group_list("group1", lints.iter());
+
+ assert_eq!(expected, result);
+ }
+}
--- /dev/null
- /// `unnecessary_cast`, `cast_lossless/possible_truncation/possible_wrap/precision_loss/sign_loss`,
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_ast::ast::{Expr, ExprKind};
+use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `as` conversions.
+ ///
+ /// Note that this lint is specialized in linting *every single* use of `as`
+ /// regardless of whether good alternatives exist or not.
+ /// If you want more precise lints for `as`, please consider using these separate lints:
++ /// `unnecessary_cast`, `cast_lossless/cast_possible_truncation/cast_possible_wrap/cast_precision_loss/cast_sign_loss`,
+ /// `fn_to_numeric_cast(_with_truncation)`, `char_lit_as_u8`, `ref_to_mut` and `ptr_as_ptr`.
+ /// There is a good explanation the reason why this lint should work in this way and how it is useful
+ /// [in this issue](https://github.com/rust-lang/rust-clippy/issues/5122).
+ ///
+ /// ### Why is this bad?
+ /// `as` conversions will perform many kinds of
+ /// conversions, including silently lossy conversions and dangerous coercions.
+ /// There are cases when it makes sense to use `as`, so the lint is
+ /// Allow by default.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let a: u32;
+ /// ...
+ /// f(a as u16);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// f(a.try_into()?);
+ ///
+ /// // or
+ ///
+ /// f(a.try_into().expect("Unexpected u16 overflow in f"));
+ /// ```
+ #[clippy::version = "1.41.0"]
+ pub AS_CONVERSIONS,
+ restriction,
+ "using a potentially dangerous silent `as` conversion"
+}
+
+declare_lint_pass!(AsConversions => [AS_CONVERSIONS]);
+
+impl EarlyLintPass for AsConversions {
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
+ if in_external_macro(cx.sess(), expr.span) {
+ return;
+ }
+
+ if let ExprKind::Cast(_, _) = expr.kind {
+ span_lint_and_help(
+ cx,
+ AS_CONVERSIONS,
+ expr.span,
+ "using a potentially dangerous silent `as` conversion",
+ None,
+ "consider using a safe wrapper for this conversion",
+ );
+ }
+ }
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use clippy_utils::macros::{find_assert_args, root_macro_call_first_node, PanicExpn};
++use clippy_utils::path_res;
++use clippy_utils::source::snippet_with_context;
++use clippy_utils::ty::{implements_trait, is_copy, is_type_diagnostic_item};
++use clippy_utils::usage::local_used_after_expr;
++use rustc_errors::Applicability;
++use rustc_hir::def::Res;
++use rustc_hir::{Expr, ExprKind};
++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 `assert!(r.is_ok())` or `assert!(r.is_err())` calls.
++ ///
++ /// ### Why is this bad?
++ /// An assertion failure cannot output an useful message of the error.
++ ///
++ /// ### Example
++ /// ```rust,ignore
++ /// # let r = Ok::<_, ()>(());
++ /// assert!(r.is_ok());
++ /// # let r = Err::<_, ()>(());
++ /// assert!(r.is_err());
++ /// ```
++ #[clippy::version = "1.64.0"]
++ pub ASSERTIONS_ON_RESULT_STATES,
++ style,
++ "`assert!(r.is_ok())`/`assert!(r.is_err())` gives worse error message than directly calling `r.unwrap()`/`r.unwrap_err()`"
++}
++
++declare_lint_pass!(AssertionsOnResultStates => [ASSERTIONS_ON_RESULT_STATES]);
++
++impl<'tcx> LateLintPass<'tcx> for AssertionsOnResultStates {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
++ if let Some(macro_call) = root_macro_call_first_node(cx, e)
++ && matches!(cx.tcx.get_diagnostic_name(macro_call.def_id), Some(sym::assert_macro))
++ && let Some((condition, panic_expn)) = find_assert_args(cx, e, macro_call.expn)
++ && matches!(panic_expn, PanicExpn::Empty)
++ && let ExprKind::MethodCall(method_segment, [recv], _) = condition.kind
++ && let result_type_with_refs = cx.typeck_results().expr_ty(recv)
++ && let result_type = result_type_with_refs.peel_refs()
++ && is_type_diagnostic_item(cx, result_type, sym::Result)
++ && let ty::Adt(_, substs) = result_type.kind()
++ {
++ if !is_copy(cx, result_type) {
++ if result_type_with_refs != result_type {
++ return;
++ } else if let Res::Local(binding_id) = path_res(cx, recv)
++ && local_used_after_expr(cx, binding_id, recv) {
++ return;
++ }
++ }
++ let mut app = Applicability::MachineApplicable;
++ match method_segment.ident.as_str() {
++ "is_ok" if has_debug_impl(cx, substs.type_at(1)) => {
++ span_lint_and_sugg(
++ cx,
++ ASSERTIONS_ON_RESULT_STATES,
++ macro_call.span,
++ "called `assert!` with `Result::is_ok`",
++ "replace with",
++ format!(
++ "{}.unwrap()",
++ snippet_with_context(cx, recv.span, condition.span.ctxt(), "..", &mut app).0
++ ),
++ app,
++ );
++ }
++ "is_err" if has_debug_impl(cx, substs.type_at(0)) => {
++ span_lint_and_sugg(
++ cx,
++ ASSERTIONS_ON_RESULT_STATES,
++ macro_call.span,
++ "called `assert!` with `Result::is_err`",
++ "replace with",
++ format!(
++ "{}.unwrap_err()",
++ snippet_with_context(cx, recv.span, condition.span.ctxt(), "..", &mut app).0
++ ),
++ app,
++ );
++ }
++ _ => (),
++ };
++ }
++ }
++}
++
++/// This checks whether a given type is known to implement Debug.
++fn has_debug_impl<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
++ cx.tcx
++ .get_diagnostic_item(sym::Debug)
++ .map_or(false, |debug| implements_trait(cx, ty, debug, &[]))
++}
--- /dev/null
- mod common_metadata;
- mod feature_name;
- mod multiple_crate_versions;
- mod wildcard_dependencies;
-
++mod common_metadata;
++mod feature_name;
++mod multiple_crate_versions;
++mod wildcard_dependencies;
++
+use cargo_metadata::MetadataCommand;
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::is_lint_allowed;
+use rustc_hir::hir_id::CRATE_HIR_ID;
+use rustc_lint::{LateContext, LateLintPass, Lint};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::DUMMY_SP;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks to see if all common metadata is defined in
+ /// `Cargo.toml`. See: https://rust-lang-nursery.github.io/api-guidelines/documentation.html#cargotoml-includes-all-common-metadata-c-metadata
+ ///
+ /// ### Why is this bad?
+ /// It will be more difficult for users to discover the
+ /// purpose of the crate, and key information related to it.
+ ///
+ /// ### Example
+ /// ```toml
+ /// # This `Cargo.toml` is missing a description field:
+ /// [package]
+ /// name = "clippy"
+ /// version = "0.0.212"
+ /// repository = "https://github.com/rust-lang/rust-clippy"
+ /// readme = "README.md"
+ /// license = "MIT OR Apache-2.0"
+ /// keywords = ["clippy", "lint", "plugin"]
+ /// categories = ["development-tools", "development-tools::cargo-plugins"]
+ /// ```
+ ///
+ /// Should include a description field like:
+ ///
+ /// ```toml
+ /// # This `Cargo.toml` includes all common metadata
+ /// [package]
+ /// name = "clippy"
+ /// version = "0.0.212"
+ /// description = "A bunch of helpful lints to avoid common pitfalls in Rust"
+ /// repository = "https://github.com/rust-lang/rust-clippy"
+ /// readme = "README.md"
+ /// license = "MIT OR Apache-2.0"
+ /// keywords = ["clippy", "lint", "plugin"]
+ /// categories = ["development-tools", "development-tools::cargo-plugins"]
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub CARGO_COMMON_METADATA,
+ cargo,
+ "common metadata is defined in `Cargo.toml`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for feature names with prefix `use-`, `with-` or suffix `-support`
+ ///
+ /// ### Why is this bad?
+ /// These prefixes and suffixes have no significant meaning.
+ ///
+ /// ### Example
+ /// ```toml
+ /// # The `Cargo.toml` with feature name redundancy
+ /// [features]
+ /// default = ["use-abc", "with-def", "ghi-support"]
+ /// use-abc = [] // redundant
+ /// with-def = [] // redundant
+ /// ghi-support = [] // redundant
+ /// ```
+ ///
+ /// Use instead:
+ /// ```toml
+ /// [features]
+ /// default = ["abc", "def", "ghi"]
+ /// abc = []
+ /// def = []
+ /// ghi = []
+ /// ```
+ ///
+ #[clippy::version = "1.57.0"]
+ pub REDUNDANT_FEATURE_NAMES,
+ cargo,
+ "usage of a redundant feature name"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for negative feature names with prefix `no-` or `not-`
+ ///
+ /// ### Why is this bad?
+ /// Features are supposed to be additive, and negatively-named features violate it.
+ ///
+ /// ### Example
+ /// ```toml
+ /// # The `Cargo.toml` with negative feature names
+ /// [features]
+ /// default = []
+ /// no-abc = []
+ /// not-def = []
+ ///
+ /// ```
+ /// Use instead:
+ /// ```toml
+ /// [features]
+ /// default = ["abc", "def"]
+ /// abc = []
+ /// def = []
+ ///
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub NEGATIVE_FEATURE_NAMES,
+ cargo,
+ "usage of a negative feature name"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks to see if multiple versions of a crate are being
+ /// used.
+ ///
+ /// ### Why is this bad?
+ /// This bloats the size of targets, and can lead to
+ /// confusing error messages when structs or traits are used interchangeably
+ /// between different versions of a crate.
+ ///
+ /// ### Known problems
+ /// Because this can be caused purely by the dependencies
+ /// themselves, it's not always possible to fix this issue.
+ ///
+ /// ### Example
+ /// ```toml
+ /// # This will pull in both winapi v0.3.x and v0.2.x, triggering a warning.
+ /// [dependencies]
+ /// ctrlc = "=3.1.0"
+ /// ansi_term = "=0.11.0"
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MULTIPLE_CRATE_VERSIONS,
+ cargo,
+ "multiple versions of the same crate being used"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard dependencies in the `Cargo.toml`.
+ ///
+ /// ### Why is this bad?
+ /// [As the edition guide says](https://rust-lang-nursery.github.io/edition-guide/rust-2018/cargo-and-crates-io/crates-io-disallows-wildcard-dependencies.html),
+ /// it is highly unlikely that you work with any possible version of your dependency,
+ /// and wildcard dependencies would cause unnecessary breakage in the ecosystem.
+ ///
+ /// ### Example
+ /// ```toml
+ /// [dependencies]
+ /// regex = "*"
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub WILDCARD_DEPENDENCIES,
+ cargo,
+ "wildcard dependencies being used"
+}
+
+pub struct Cargo {
+ pub ignore_publish: bool,
+}
+
+impl_lint_pass!(Cargo => [
+ CARGO_COMMON_METADATA,
+ REDUNDANT_FEATURE_NAMES,
+ NEGATIVE_FEATURE_NAMES,
+ MULTIPLE_CRATE_VERSIONS,
+ WILDCARD_DEPENDENCIES
+]);
+
+impl LateLintPass<'_> for Cargo {
+ fn check_crate(&mut self, cx: &LateContext<'_>) {
+ static NO_DEPS_LINTS: &[&Lint] = &[
+ CARGO_COMMON_METADATA,
+ REDUNDANT_FEATURE_NAMES,
+ NEGATIVE_FEATURE_NAMES,
+ WILDCARD_DEPENDENCIES,
+ ];
+ static WITH_DEPS_LINTS: &[&Lint] = &[MULTIPLE_CRATE_VERSIONS];
+
+ if !NO_DEPS_LINTS
+ .iter()
+ .all(|&lint| is_lint_allowed(cx, lint, CRATE_HIR_ID))
+ {
+ match MetadataCommand::new().no_deps().exec() {
+ Ok(metadata) => {
+ common_metadata::check(cx, &metadata, self.ignore_publish);
+ feature_name::check(cx, &metadata);
+ wildcard_dependencies::check(cx, &metadata);
+ },
+ Err(e) => {
+ for lint in NO_DEPS_LINTS {
+ span_lint(cx, lint, DUMMY_SP, &format!("could not read cargo metadata: {}", e));
+ }
+ },
+ }
+ }
+
+ if !WITH_DEPS_LINTS
+ .iter()
+ .all(|&lint| is_lint_allowed(cx, lint, CRATE_HIR_ID))
+ {
+ match MetadataCommand::new().exec() {
+ Ok(metadata) => {
+ multiple_crate_versions::check(cx, &metadata);
+ },
+ Err(e) => {
+ for lint in WITH_DEPS_LINTS {
+ span_lint(cx, lint, DUMMY_SP, &format!("could not read cargo metadata: {}", e));
+ }
+ },
+ }
+ }
+ }
+}
--- /dev/null
- /// filename.rsplit('.').next().map(|ext| ext.eq_ignore_ascii_case("rs")) == Some(true)
+use clippy_utils::diagnostics::span_lint_and_help;
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_hir::{Expr, ExprKind, PathSegment};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{source_map::Spanned, symbol::sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `ends_with` with possible file extensions
+ /// and suggests to use a case-insensitive approach instead.
+ ///
+ /// ### Why is this bad?
+ /// `ends_with` is case-sensitive and may not detect files with a valid extension.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn is_rust_file(filename: &str) -> bool {
+ /// filename.ends_with(".rs")
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn is_rust_file(filename: &str) -> bool {
++ /// let filename = std::path::Path::new(filename);
++ /// filename.extension()
++ /// .map(|ext| ext.eq_ignore_ascii_case("rs"))
++ /// .unwrap_or(false)
+ /// }
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ pedantic,
+ "Checks for calls to ends_with with case-sensitive file extensions"
+}
+
+declare_lint_pass!(CaseSensitiveFileExtensionComparisons => [CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS]);
+
+fn check_case_sensitive_file_extension_comparison(ctx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Span> {
+ if_chain! {
+ if let ExprKind::MethodCall(PathSegment { ident, .. }, [obj, extension, ..], span) = expr.kind;
+ if ident.as_str() == "ends_with";
+ if let ExprKind::Lit(Spanned { node: LitKind::Str(ext_literal, ..), ..}) = extension.kind;
+ if (2..=6).contains(&ext_literal.as_str().len());
+ if ext_literal.as_str().starts_with('.');
+ if ext_literal.as_str().chars().skip(1).all(|c| c.is_uppercase() || c.is_ascii_digit())
+ || ext_literal.as_str().chars().skip(1).all(|c| c.is_lowercase() || c.is_ascii_digit());
+ then {
+ let mut ty = ctx.typeck_results().expr_ty(obj);
+ ty = match ty.kind() {
+ ty::Ref(_, ty, ..) => *ty,
+ _ => ty
+ };
+
+ match ty.kind() {
+ ty::Str => {
+ return Some(span);
+ },
+ ty::Adt(def, _) => {
+ if ctx.tcx.is_diagnostic_item(sym::String, def.did()) {
+ return Some(span);
+ }
+ },
+ _ => { return None; }
+ }
+ }
+ }
+ None
+}
+
+impl<'tcx> LateLintPass<'tcx> for CaseSensitiveFileExtensionComparisons {
+ fn check_expr(&mut self, ctx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if let Some(span) = check_case_sensitive_file_extension_comparison(ctx, expr) {
+ span_lint_and_help(
+ ctx,
+ CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ span,
+ "case-sensitive file extension comparison",
+ None,
+ "consider using a case-insensitive comparison instead",
+ );
+ }
+ }
+}
--- /dev/null
- && expr.precedence().order() < data.position.precedence()
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
+use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
+use clippy_utils::sugg::has_enclosing_paren;
+use clippy_utils::ty::{expr_sig, peel_mid_ty_refs, variant_of_res};
+use clippy_utils::{get_parent_expr, 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_errors::Applicability;
+use rustc_hir::intravisit::{walk_ty, Visitor};
+use rustc_hir::{
+ self as hir, 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_infer::infer::TyCtxtInferExt;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
+use rustc_middle::ty::{self, 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;
+
+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 = "1.60.0"]
+ 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 {
+ 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>>,
+}
+
+struct StateData {
+ /// Span of the top level expression
+ span: Span,
+ hir_id: HirId,
+ position: Position,
+}
+
+struct DerefedBorrow {
+ count: usize,
+ msg: &'static str,
+}
+
+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 {
+ // Span and id of the top-level deref expression if the parent expression is a borrow.
+ deref_span_id: Option<(Span, HirId)>,
+ },
+ ExplicitDerefField {
+ name: Symbol,
+ },
+ Reborrow {
+ deref_span: Span,
+ deref_hir_id: HirId,
+ },
+ Borrow,
+}
+
+// A reference operation considered by this lint pass
+enum RefOp {
+ Method(Mutability),
+ Deref,
+ AddrOf,
+}
+
+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 {
+ #[expect(clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Skip path expressions from deref calls. e.g. `Deref::deref(e)`
+ if Some(expr.hir_id) == self.skip_expr.take() {
+ return;
+ }
+
+ if let Some(local) = path_to_local(expr) {
+ self.check_local_usage(cx, expr, local);
+ }
+
+ // Stop processing sub expressions when a macro call is seen
+ if expr.span.from_expansion() {
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ }
+
+ let typeck = cx.typeck_results();
+ let (kind, sub_expr) = if let Some(x) = try_parse_ref_op(cx.tcx, typeck, expr) {
+ x
+ } else {
+ // The whole chain of reference operations has been seen
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ };
+
+ match (self.state.take(), kind) {
+ (None, kind) => {
+ let expr_ty = typeck.expr_ty(expr);
+ let (position, adjustments) = walk_parents(cx, expr);
+
+ match kind {
+ RefOp::Deref => {
+ 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 { deref_span_id: 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() =>
+ {
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count: if deref_method_same_type(expr_ty, typeck.expr_ty(sub_expr)) {
+ 0
+ } else {
+ 1
+ },
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
+ target_mut,
+ },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position
+ },
+ ));
+ },
+ RefOp::AddrOf => {
+ // 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 (required_refs, msg) = if position.can_auto_borrow() {
+ (1, if deref_count == 1 { borrow_msg } else { deref_msg })
+ } 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)
+ } else {
+ (2, deref_msg)
+ }
+ } else {
+ (2, deref_msg)
+ };
+
+ 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,
+ }),
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable() {
+ self.state = Some((
+ State::Borrow,
+ 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) => {
+ let position = data.position;
+ report(cx, expr, State::DerefedBorrow(state), data);
+ if position.is_deref_stable() {
+ self.state = Some((
+ State::Borrow,
+ 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 { deref_span_id: None },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ }
+ },
+
+ (Some((State::Borrow, data)), RefOp::Deref) => {
+ if typeck.expr_ty(sub_expr).is_ref() {
+ self.state = Some((
+ State::Reborrow {
+ deref_span: expr.span,
+ deref_hir_id: expr.hir_id,
+ },
+ data,
+ ));
+ } else {
+ self.state = Some((
+ State::ExplicitDeref {
+ deref_span_id: Some((expr.span, expr.hir_id)),
+ },
+ data,
+ ));
+ }
+ },
+ (
+ Some((
+ State::Reborrow {
+ deref_span,
+ deref_hir_id,
+ },
+ data,
+ )),
+ RefOp::Deref,
+ ) => {
+ self.state = Some((
+ State::ExplicitDeref {
+ deref_span_id: Some((deref_span, deref_hir_id)),
+ },
+ 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 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;
+ }
+ }
+}
+
+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, _, sub_expr) => return Some((RefOp::AddrOf, 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)]
+enum Position {
+ MethodReceiver,
+ /// The method is defined on a reference type. e.g. `impl Foo for &T`
+ MethodReceiverRefImpl,
+ Callee,
+ FieldAccess(Symbol),
+ Postfix,
+ Deref,
+ /// Any other location which will trigger auto-deref to a specific time.
+ DerefStable(i8),
+ /// Any other location which will trigger auto-reborrowing.
+ ReborrowStable(i8),
+ 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(_) | 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::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.
+#[allow(clippy::too_many_lines)]
+fn walk_parents<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> (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(ty, precedence))
+ },
+ Node::Item(&Item {
+ kind: ItemKind::Static(..) | ItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let ty = cx.tcx.type_of(def_id);
+ Some(if ty.is_ref() {
+ Position::DerefStable(precedence)
+ } else {
+ Position::Other(precedence)
+ })
+ },
+
+ Node::Item(&Item {
+ kind: ItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let output = cx.tcx.fn_sig(def_id.to_def_id()).skip_binder().output();
+ Some(if !output.is_ref() {
+ Position::Other(precedence)
+ } else if output.has_placeholders() || output.has_opaque_types() {
+ Position::ReborrowStable(precedence)
+ } else {
+ Position::DerefStable(precedence)
+ })
+ },
+
+ 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(Expr {
+ kind: ExprKind::Closure(&Closure { fn_decl, .. }),
+ ..
+ }) = cx.tcx.hir().get(owner_id)
+ {
+ match fn_decl.output {
+ FnRetTy::Return(ty) => binding_ty_auto_deref_stability(ty, precedence),
+ FnRetTy::DefaultReturn(_) => Position::Other(precedence),
+ }
+ } else {
+ let output = cx
+ .tcx
+ .fn_sig(cx.tcx.hir().local_def_id(owner_id))
+ .skip_binder()
+ .output();
+ if !output.is_ref() {
+ Position::Other(precedence)
+ } else if output.has_placeholders() || output.has_opaque_types() {
+ Position::ReborrowStable(precedence)
+ } else {
+ Position::DerefStable(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(ty) => binding_ty_auto_deref_stability(ty, precedence),
+ None => param_auto_deref_stability(ty.skip_binder(), precedence),
+ }),
+ ExprKind::MethodCall(_, args, _) => {
+ let id = cx.typeck_results().type_dependent_def_id(parent.hir_id).unwrap();
+ args.iter().position(|arg| arg.hir_id == child_id).map(|i| {
+ if i == 0 {
+ // 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 {
+ Position::ReborrowStable(precedence)
+ } else if let Some(trait_id) = cx.tcx.trait_of_item(id)
+ && let arg_ty = cx.tcx.erase_regions(cx.typeck_results().expr_ty_adjusted(e))
+ && let ty::Ref(_, sub_ty, _) = *arg_ty.kind()
+ && let subs = match cx
+ .typeck_results()
+ .node_substs_opt(parent.hir_id)
+ .and_then(|subs| subs.get(1..))
+ {
+ Some(subs) => cx.tcx.mk_substs(subs.iter().copied()),
+ None => cx.tcx.mk_substs([].iter()),
+ } && 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()
+ && cx.tcx.infer_ctxt().enter(|infcx|
+ infcx
+ .type_implements_trait(trait_id, impl_ty, subs, cx.param_env)
+ .must_apply_modulo_regions()
+ )
+ {
+ Position::MethodReceiverRefImpl
+ } else {
+ Position::MethodReceiver
+ }
+ } else {
+ param_auto_deref_stability(cx.tcx.fn_sig(id).skip_binder().inputs()[i], precedence)
+ }
+ })
+ },
+ ExprKind::Struct(path, fields, _) => {
+ let variant = variant_of_res(cx, cx.qpath_res(path, parent.hir_id));
+ fields
+ .iter()
+ .find(|f| f.expr.hir_id == child_id)
+ .zip(variant)
+ .and_then(|(field, variant)| variant.fields.iter().find(|f| f.name == field.ident.name))
+ .map(|field| param_auto_deref_stability(cx.tcx.type_of(field.did), precedence))
+ },
+ ExprKind::Field(child, name) if child.hir_id == e.hir_id => Some(Position::FieldAccess(name.name)),
+ 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)
+}
+
+// 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(ty: &hir::Ty<'_>, precedence: i8) -> Position {
+ let TyKind::Rptr(_, ty) = &ty.kind else {
+ return Position::Other(precedence);
+ };
+ let mut ty = ty;
+
+ loop {
+ break match ty.ty.kind {
+ TyKind::Rptr(_, ref ref_ty) => {
+ ty = ref_ty;
+ continue;
+ },
+ TyKind::Path(
+ QPath::TypeRelative(_, path)
+ | QPath::Resolved(
+ _,
+ Path {
+ segments: [.., path], ..
+ },
+ ),
+ ) => {
+ if let Some(args) = path.args
+ && args.args.iter().any(|arg| match arg {
+ GenericArg::Infer(_) => true,
+ GenericArg::Type(ty) => ty_contains_infer(ty),
+ _ => false,
+ })
+ {
+ Position::ReborrowStable(precedence)
+ } else {
+ Position::DerefStable(precedence)
+ }
+ },
+ TyKind::Slice(_)
+ | TyKind::Array(..)
+ | TyKind::BareFn(_)
+ | TyKind::Never
+ | TyKind::Tup(_)
+ | TyKind::Ptr(_)
+ | TyKind::TraitObject(..)
+ | TyKind::Path(_) => Position::DerefStable(precedence),
+ TyKind::OpaqueDef(..)
+ | TyKind::Infer
+ | TyKind::Typeof(..)
+ | TyKind::Err => Position::ReborrowStable(precedence),
+ };
+ }
+}
+
+// Checks whether a type is inferred at some point.
+// e.g. `_`, `Box<_>`, `[_]`
+fn ty_contains_infer(ty: &hir::Ty<'_>) -> bool {
+ struct V(bool);
+ impl Visitor<'_> for V {
+ fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
+ if self.0
+ || matches!(
+ ty.kind,
+ TyKind::OpaqueDef(..) | TyKind::Infer | TyKind::Typeof(_) | TyKind::Err
+ )
+ {
+ self.0 = true;
+ } else {
+ walk_ty(self, ty);
+ }
+ }
+
+ fn visit_generic_arg(&mut self, arg: &GenericArg<'_>) {
+ if self.0 || matches!(arg, GenericArg::Infer(_)) {
+ self.0 = true;
+ } else if let GenericArg::Type(ty) = arg {
+ self.visit_ty(ty);
+ }
+ }
+ }
+ let mut v = V(false);
+ v.visit_ty(ty);
+ v.0
+}
+
+// Checks whether a type is stable when switching to auto dereferencing,
+fn param_auto_deref_stability(ty: Ty<'_>, precedence: i8) -> Position {
+ let ty::Ref(_, mut ty, _) = *ty.kind() else {
+ return Position::Other(precedence);
+ };
+
+ loop {
+ break match *ty.kind() {
+ ty::Ref(_, ref_ty, _) => {
+ ty = ref_ty;
+ continue;
+ },
+ ty::Infer(_)
+ | ty::Error(_)
+ | ty::Param(_)
+ | ty::Bound(..)
+ | ty::Opaque(..)
+ | ty::Placeholder(_)
+ | ty::Dynamic(..) => Position::ReborrowStable(precedence),
+ ty::Adt(..) if ty.has_placeholders() || ty.has_param_types_or_consts() => {
+ Position::ReborrowStable(precedence)
+ },
+ ty::Adt(..)
+ | ty::Bool
+ | ty::Char
+ | ty::Int(_)
+ | ty::Uint(_)
+ | ty::Float(_)
+ | ty::Foreign(_)
+ | ty::Str
+ | ty::Array(..)
+ | ty::Slice(..)
+ | ty::RawPtr(..)
+ | ty::FnDef(..)
+ | ty::FnPtr(_)
+ | ty::Closure(..)
+ | ty::Generator(..)
+ | ty::GeneratorWitness(..)
+ | ty::Never
+ | ty::Tuple(_)
+ | ty::Projection(_) => Position::DerefStable(precedence),
+ };
+ }
+}
+
+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, snip_is_macro) = snippet_with_context(cx, 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 { deref_span_id } => {
+ let (span, hir_id, precedence) = if let Some((span, hir_id)) = deref_span_id
+ && !cx.typeck_results().expr_ty(expr).is_ref()
+ {
+ (span, hir_id, PREC_PREFIX)
+ } else {
+ (data.span, data.hir_id, data.position.precedence())
+ };
+ span_lint_hir_and_then(
+ cx,
+ EXPLICIT_AUTO_DEREF,
+ hir_id,
+ 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, span.ctxt(), "..", &mut app);
+ let sugg =
+ if !snip_is_macro && expr.precedence().order() < precedence && !has_enclosing_paren(&snip) {
+ format!("({})", snip)
+ } else {
+ snip.into()
+ };
+ diag.span_suggestion(span, "try this", sugg, app);
+ },
+ );
+ },
+ State::ExplicitDerefField { .. } => {
+ 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 Dereferencing {
+ fn check_local_usage<'tcx>(&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
- use rustc_span::{sym, BytePos, Span};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::macros::{root_macro_call_first_node, FormatArgsExpn};
+use clippy_utils::source::{snippet_opt, snippet_with_applicability};
+use clippy_utils::sugg::Sugg;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::kw;
- let sugg = if format_args.format_string_span.contains(value.span) {
- // Implicit argument. e.g. `format!("{x}")` span points to `{x}`
- let spdata = value.span.data();
- let span = Span::new(
- spdata.lo + BytePos(1),
- spdata.hi - BytePos(1),
- spdata.ctxt,
- spdata.parent
- );
- let snip = snippet_with_applicability(cx, span, "..", &mut applicability);
- if is_new_string {
- snip.into()
- } else {
- format!("{snip}.to_string()")
- }
- } else if is_new_string {
++use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `format!("string literal with no
+ /// argument")` and `format!("{}", foo)` where `foo` is a string.
+ ///
+ /// ### Why is this bad?
+ /// There is no point of doing that. `format!("foo")` can
+ /// be replaced by `"foo".to_owned()` if you really need a `String`. The even
+ /// worse `&format!("foo")` is often encountered in the wild. `format!("{}",
+ /// foo)` can be replaced by `foo.clone()` if `foo: String` or `foo.to_owned()`
+ /// if `foo: &str`.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// let foo = "foo";
+ /// format!("{}", foo);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo = "foo";
+ /// foo.to_owned();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub USELESS_FORMAT,
+ complexity,
+ "useless use of `format!`"
+}
+
+declare_lint_pass!(UselessFormat => [USELESS_FORMAT]);
+
+impl<'tcx> LateLintPass<'tcx> for UselessFormat {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ let (format_args, call_site) = if_chain! {
+ if let Some(macro_call) = root_macro_call_first_node(cx, expr);
+ if cx.tcx.is_diagnostic_item(sym::format_macro, macro_call.def_id);
+ if let Some(format_args) = FormatArgsExpn::find_nested(cx, expr, macro_call.expn);
+ then {
+ (format_args, macro_call.span)
+ } else {
+ return
+ }
+ };
+
+ let mut applicability = Applicability::MachineApplicable;
+ if format_args.value_args.is_empty() {
+ match *format_args.format_string_parts {
+ [] => span_useless_format_empty(cx, call_site, "String::new()".to_owned(), applicability),
+ [_] => {
+ if let Some(s_src) = snippet_opt(cx, format_args.format_string_span) {
+ // Simulate macro expansion, converting {{ and }} to { and }.
+ let s_expand = s_src.replace("{{", "{").replace("}}", "}");
+ let sugg = format!("{}.to_string()", s_expand);
+ span_useless_format(cx, call_site, sugg, applicability);
+ }
+ },
+ [..] => {},
+ }
+ } else if let [value] = *format_args.value_args {
+ if_chain! {
+ if format_args.format_string_parts == [kw::Empty];
+ if match cx.typeck_results().expr_ty(value).peel_refs().kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(sym::String, adt.did()),
+ ty::Str => true,
+ _ => false,
+ };
+ if let Some(args) = format_args.args();
+ if args.iter().all(|arg| arg.format_trait == sym::Display && !arg.has_string_formatting());
+ then {
+ let is_new_string = match value.kind {
+ ExprKind::Binary(..) => true,
+ ExprKind::MethodCall(path, ..) => path.ident.name == sym::to_string,
+ _ => false,
+ };
++ let sugg = if is_new_string {
+ snippet_with_applicability(cx, value.span, "..", &mut applicability).into_owned()
+ } else {
+ let sugg = Sugg::hir_with_applicability(cx, value, "<arg>", &mut applicability);
+ format!("{}.to_string()", sugg.maybe_par())
+ };
+ span_useless_format(cx, call_site, sugg, applicability);
+ }
+ }
+ };
+ }
+}
+
+fn span_useless_format_empty(cx: &LateContext<'_>, span: Span, sugg: String, applicability: Applicability) {
+ span_lint_and_sugg(
+ cx,
+ USELESS_FORMAT,
+ span,
+ "useless use of `format!`",
+ "consider using `String::new()`",
+ sugg,
+ applicability,
+ );
+}
+
+fn span_useless_format(cx: &LateContext<'_>, span: Span, sugg: String, applicability: Applicability) {
+ span_lint_and_sugg(
+ cx,
+ USELESS_FORMAT,
+ span,
+ "useless use of `format!`",
+ "consider using `.to_string()`",
+ sugg,
+ applicability,
+ );
+}
--- /dev/null
- if path.ident.name == sym!(to_string);
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
+use clippy_utils::macros::{is_format_macro, root_macro_call_first_node, FormatArgsArg, FormatArgsExpn};
+use clippy_utils::{get_parent_as_impl, is_diag_trait_item, path_to_local, peel_ref_operators};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, Impl, ImplItem, ImplItemKind, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{sym, symbol::kw, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for format trait implementations (e.g. `Display`) with a recursive call to itself
+ /// which uses `self` as a parameter.
+ /// This is typically done indirectly with the `write!` macro or with `to_string()`.
+ ///
+ /// ### Why is this bad?
+ /// This will lead to infinite recursion and a stack overflow.
+ ///
+ /// ### Example
+ ///
+ /// ```rust
+ /// use std::fmt;
+ ///
+ /// struct Structure(i32);
+ /// impl fmt::Display for Structure {
+ /// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ /// write!(f, "{}", self.to_string())
+ /// }
+ /// }
+ ///
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use std::fmt;
+ ///
+ /// struct Structure(i32);
+ /// impl fmt::Display for Structure {
+ /// fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ /// write!(f, "{}", self.0)
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub RECURSIVE_FORMAT_IMPL,
+ correctness,
+ "Format trait method called while implementing the same Format trait"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `println`, `print`, `eprintln` or `eprint` in an
+ /// implementation of a formatting trait.
+ ///
+ /// ### Why is this bad?
+ /// Using a print macro is likely unintentional since formatting traits
+ /// should write to the `Formatter`, not stdout/stderr.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::fmt::{Display, Error, Formatter};
+ ///
+ /// struct S;
+ /// impl Display for S {
+ /// fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
+ /// println!("S");
+ ///
+ /// Ok(())
+ /// }
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use std::fmt::{Display, Error, Formatter};
+ ///
+ /// struct S;
+ /// impl Display for S {
+ /// fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
+ /// writeln!(f, "S");
+ ///
+ /// Ok(())
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub PRINT_IN_FORMAT_IMPL,
+ suspicious,
+ "use of a print macro in a formatting trait impl"
+}
+
+#[derive(Clone, Copy)]
+struct FormatTrait {
+ /// e.g. `sym::Display`
+ name: Symbol,
+ /// `f` in `fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {}`
+ formatter_name: Option<Symbol>,
+}
+
+#[derive(Default)]
+pub struct FormatImpl {
+ // Whether we are inside Display or Debug trait impl - None for neither
+ format_trait_impl: Option<FormatTrait>,
+}
+
+impl FormatImpl {
+ pub fn new() -> Self {
+ Self {
+ format_trait_impl: None,
+ }
+ }
+}
+
+impl_lint_pass!(FormatImpl => [RECURSIVE_FORMAT_IMPL, PRINT_IN_FORMAT_IMPL]);
+
+impl<'tcx> LateLintPass<'tcx> for FormatImpl {
+ fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &ImplItem<'_>) {
+ self.format_trait_impl = is_format_trait_impl(cx, impl_item);
+ }
+
+ fn check_impl_item_post(&mut self, cx: &LateContext<'_>, impl_item: &ImplItem<'_>) {
+ // Assume no nested Impl of Debug and Display within eachother
+ if is_format_trait_impl(cx, impl_item).is_some() {
+ self.format_trait_impl = None;
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ let Some(format_trait_impl) = self.format_trait_impl else { return };
+
+ if format_trait_impl.name == sym::Display {
+ check_to_string_in_display(cx, expr);
+ }
+
+ check_self_in_format_args(cx, expr, format_trait_impl);
+ check_print_in_format_impl(cx, expr, format_trait_impl);
+ }
+}
+
+fn check_to_string_in_display(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ // Get the hir_id of the object we are calling the method on
+ if let ExprKind::MethodCall(path, [ref self_arg, ..], _) = expr.kind;
+ // Is the method to_string() ?
++ if path.ident.name == sym::to_string;
+ // Is the method a part of the ToString trait? (i.e. not to_string() implemented
+ // separately)
+ if let Some(expr_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if is_diag_trait_item(cx, expr_def_id, sym::ToString);
+ // Is the method is called on self
+ if let ExprKind::Path(QPath::Resolved(_, path)) = self_arg.kind;
+ if let [segment] = path.segments;
+ if segment.ident.name == kw::SelfLower;
+ then {
+ span_lint(
+ cx,
+ RECURSIVE_FORMAT_IMPL,
+ expr.span,
+ "using `self.to_string` in `fmt::Display` implementation will cause infinite recursion",
+ );
+ }
+ }
+}
+
+fn check_self_in_format_args<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, impl_trait: FormatTrait) {
+ // Check each arg in format calls - do we ever use Display on self (directly or via deref)?
+ if_chain! {
+ if let Some(outer_macro) = root_macro_call_first_node(cx, expr);
+ if let macro_def_id = outer_macro.def_id;
+ if let Some(format_args) = FormatArgsExpn::find_nested(cx, expr, outer_macro.expn);
+ if is_format_macro(cx, macro_def_id);
+ if let Some(args) = format_args.args();
+ then {
+ for arg in args {
+ if arg.format_trait != impl_trait.name {
+ continue;
+ }
+ check_format_arg_self(cx, expr, &arg, impl_trait);
+ }
+ }
+ }
+}
+
+fn check_format_arg_self(cx: &LateContext<'_>, expr: &Expr<'_>, arg: &FormatArgsArg<'_>, impl_trait: FormatTrait) {
+ // Handle multiple dereferencing of references e.g. &&self
+ // Handle dereference of &self -> self that is equivalent (i.e. via *self in fmt() impl)
+ // Since the argument to fmt is itself a reference: &self
+ let reference = peel_ref_operators(cx, arg.value);
+ let map = cx.tcx.hir();
+ // Is the reference self?
+ if path_to_local(reference).map(|x| map.name(x)) == Some(kw::SelfLower) {
+ let FormatTrait { name, .. } = impl_trait;
+ span_lint(
+ cx,
+ RECURSIVE_FORMAT_IMPL,
+ expr.span,
+ &format!("using `self` as `{name}` in `impl {name}` will cause infinite recursion"),
+ );
+ }
+}
+
+fn check_print_in_format_impl(cx: &LateContext<'_>, expr: &Expr<'_>, impl_trait: FormatTrait) {
+ if_chain! {
+ if let Some(macro_call) = root_macro_call_first_node(cx, expr);
+ if let Some(name) = cx.tcx.get_diagnostic_name(macro_call.def_id);
+ then {
+ let replacement = match name {
+ sym::print_macro | sym::eprint_macro => "write",
+ sym::println_macro | sym::eprintln_macro => "writeln",
+ _ => return,
+ };
+
+ let name = name.as_str().strip_suffix("_macro").unwrap();
+
+ span_lint_and_sugg(
+ cx,
+ PRINT_IN_FORMAT_IMPL,
+ macro_call.span,
+ &format!("use of `{}!` in `{}` impl", name, impl_trait.name),
+ "replace with",
+ if let Some(formatter_name) = impl_trait.formatter_name {
+ format!("{}!({}, ..)", replacement, formatter_name)
+ } else {
+ format!("{}!(..)", replacement)
+ },
+ Applicability::HasPlaceholders,
+ );
+ }
+ }
+}
+
+fn is_format_trait_impl(cx: &LateContext<'_>, impl_item: &ImplItem<'_>) -> Option<FormatTrait> {
+ if_chain! {
+ if impl_item.ident.name == sym::fmt;
+ if let ImplItemKind::Fn(_, body_id) = impl_item.kind;
+ if let Some(Impl { of_trait: Some(trait_ref),..}) = get_parent_as_impl(cx.tcx, impl_item.hir_id());
+ if let Some(did) = trait_ref.trait_def_id();
+ if let Some(name) = cx.tcx.get_diagnostic_name(did);
+ if matches!(name, sym::Debug | sym::Display);
+ then {
+ let body = cx.tcx.hir().body(body_id);
+ let formatter_name = body.params.get(1)
+ .and_then(|param| param.pat.simple_ident())
+ .map(|ident| ident.name);
+
+ Some(FormatTrait {
+ name,
+ formatter_name,
+ })
+ } else {
+ None
+ }
+ }
+}
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::all", Some("clippy_all"), vec![
+ LintId::of(almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE),
+ LintId::of(approx_const::APPROX_CONSTANT),
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
++ LintId::of(assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES),
+ LintId::of(async_yields_async::ASYNC_YIELDS_ASYNC),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(attrs::DEPRECATED_SEMVER),
+ LintId::of(attrs::MISMATCHED_TARGET_OS),
+ LintId::of(attrs::USELESS_ATTRIBUTE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
+ LintId::of(blacklisted_name::BLACKLISTED_NAME),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(booleans::LOGIC_BUG),
+ LintId::of(booleans::NONMINIMAL_BOOL),
+ LintId::of(borrow_deref_ref::BORROW_DEREF_REF),
+ LintId::of(bytes_count_to_len::BYTES_COUNT_TO_LEN),
+ LintId::of(casts::CAST_ABS_TO_UNSIGNED),
+ LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
+ LintId::of(casts::CAST_ENUM_TRUNCATION),
+ LintId::of(casts::CAST_REF_TO_MUT),
+ LintId::of(casts::CAST_SLICE_DIFFERENT_SIZES),
+ LintId::of(casts::CHAR_LIT_AS_U8),
+ LintId::of(casts::FN_TO_NUMERIC_CAST),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
+ LintId::of(casts::UNNECESSARY_CAST),
+ LintId::of(collapsible_if::COLLAPSIBLE_ELSE_IF),
+ LintId::of(collapsible_if::COLLAPSIBLE_IF),
+ LintId::of(comparison_chain::COMPARISON_CHAIN),
+ LintId::of(copies::IFS_SAME_COND),
+ LintId::of(copies::IF_SAME_THEN_ELSE),
+ LintId::of(crate_in_macro_def::CRATE_IN_MACRO_DEF),
+ LintId::of(default::FIELD_REASSIGN_WITH_DEFAULT),
+ LintId::of(default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY),
+ LintId::of(dereference::EXPLICIT_AUTO_DEREF),
+ LintId::of(dereference::NEEDLESS_BORROW),
+ LintId::of(derivable_impls::DERIVABLE_IMPLS),
+ LintId::of(derive::DERIVE_HASH_XOR_EQ),
+ LintId::of(derive::DERIVE_ORD_XOR_PARTIAL_ORD),
+ LintId::of(derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ),
+ LintId::of(disallowed_methods::DISALLOWED_METHODS),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(drop_forget_ref::DROP_COPY),
+ LintId::of(drop_forget_ref::DROP_NON_DROP),
+ LintId::of(drop_forget_ref::DROP_REF),
+ LintId::of(drop_forget_ref::FORGET_COPY),
+ LintId::of(drop_forget_ref::FORGET_NON_DROP),
+ LintId::of(drop_forget_ref::FORGET_REF),
+ LintId::of(drop_forget_ref::UNDROPPED_MANUALLY_DROPS),
+ LintId::of(duplicate_mod::DUPLICATE_MOD),
+ LintId::of(entry::MAP_ENTRY),
+ LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(escape::BOXED_LOCAL),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(format::USELESS_FORMAT),
+ LintId::of(format_args::FORMAT_IN_FORMAT_ARGS),
+ LintId::of(format_args::TO_STRING_IN_FORMAT_ARGS),
+ LintId::of(format_impl::PRINT_IN_FORMAT_IMPL),
+ LintId::of(format_impl::RECURSIVE_FORMAT_IMPL),
+ LintId::of(formatting::POSSIBLE_MISSING_COMMA),
+ LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+ LintId::of(from_over_into::FROM_OVER_INTO),
+ LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
+ LintId::of(functions::DOUBLE_MUST_USE),
+ LintId::of(functions::MUST_USE_UNIT),
+ LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF),
+ LintId::of(functions::RESULT_UNIT_ERR),
+ LintId::of(functions::TOO_MANY_ARGUMENTS),
+ LintId::of(get_first::GET_FIRST),
+ LintId::of(if_let_mutex::IF_LET_MUTEX),
+ LintId::of(indexing_slicing::OUT_OF_BOUNDS_INDEXING),
+ LintId::of(infinite_iter::INFINITE_ITER),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY),
+ LintId::of(init_numbered_fields::INIT_NUMBERED_FIELDS),
+ LintId::of(inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
+ LintId::of(int_plus_one::INT_PLUS_ONE),
+ LintId::of(invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED),
+ LintId::of(large_const_arrays::LARGE_CONST_ARRAYS),
+ LintId::of(large_enum_variant::LARGE_ENUM_VARIANT),
+ LintId::of(len_zero::COMPARISON_TO_EMPTY),
+ LintId::of(len_zero::LEN_WITHOUT_IS_EMPTY),
+ LintId::of(len_zero::LEN_ZERO),
+ LintId::of(let_underscore::LET_UNDERSCORE_LOCK),
+ LintId::of(lifetimes::EXTRA_UNUSED_LIFETIMES),
+ LintId::of(lifetimes::NEEDLESS_LIFETIMES),
+ LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
+ LintId::of(literal_representation::MISTYPED_LITERAL_SUFFIXES),
+ LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
+ LintId::of(loops::EMPTY_LOOP),
+ LintId::of(loops::EXPLICIT_COUNTER_LOOP),
+ LintId::of(loops::FOR_KV_MAP),
+ LintId::of(loops::FOR_LOOPS_OVER_FALLIBLES),
+ LintId::of(loops::ITER_NEXT_LOOP),
+ LintId::of(loops::MANUAL_FIND),
+ LintId::of(loops::MANUAL_FLATTEN),
+ LintId::of(loops::MANUAL_MEMCPY),
+ LintId::of(loops::MISSING_SPIN_LOOP),
+ LintId::of(loops::MUT_RANGE_BOUND),
+ LintId::of(loops::NEEDLESS_COLLECT),
+ LintId::of(loops::NEEDLESS_RANGE_LOOP),
+ LintId::of(loops::NEVER_LOOP),
+ LintId::of(loops::SAME_ITEM_PUSH),
+ LintId::of(loops::SINGLE_ELEMENT_LOOP),
+ LintId::of(loops::WHILE_IMMUTABLE_CONDITION),
+ LintId::of(loops::WHILE_LET_LOOP),
+ LintId::of(loops::WHILE_LET_ON_ITERATOR),
+ LintId::of(main_recursion::MAIN_RECURSION),
+ LintId::of(manual_async_fn::MANUAL_ASYNC_FN),
+ LintId::of(manual_bits::MANUAL_BITS),
+ LintId::of(manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
+ LintId::of(manual_rem_euclid::MANUAL_REM_EUCLID),
+ LintId::of(manual_retain::MANUAL_RETAIN),
+ LintId::of(manual_strip::MANUAL_STRIP),
+ LintId::of(map_clone::MAP_CLONE),
+ LintId::of(map_unit_fn::OPTION_MAP_UNIT_FN),
+ LintId::of(map_unit_fn::RESULT_MAP_UNIT_FN),
+ LintId::of(match_result_ok::MATCH_RESULT_OK),
+ LintId::of(matches::COLLAPSIBLE_MATCH),
+ LintId::of(matches::INFALLIBLE_DESTRUCTURING_MATCH),
+ LintId::of(matches::MANUAL_MAP),
+ LintId::of(matches::MANUAL_UNWRAP_OR),
+ LintId::of(matches::MATCH_AS_REF),
+ LintId::of(matches::MATCH_LIKE_MATCHES_MACRO),
+ LintId::of(matches::MATCH_OVERLAPPING_ARM),
+ LintId::of(matches::MATCH_REF_PATS),
+ LintId::of(matches::MATCH_SINGLE_BINDING),
+ LintId::of(matches::MATCH_STR_CASE_MISMATCH),
+ LintId::of(matches::NEEDLESS_MATCH),
+ LintId::of(matches::REDUNDANT_PATTERN_MATCHING),
+ LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
+ LintId::of(matches::SINGLE_MATCH),
+ LintId::of(matches::WILDCARD_IN_OR_PATTERNS),
+ LintId::of(mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_DEFAULT),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_UNINIT),
+ LintId::of(methods::BIND_INSTEAD_OF_MAP),
+ LintId::of(methods::BYTES_NTH),
+ LintId::of(methods::CHARS_LAST_CMP),
+ LintId::of(methods::CHARS_NEXT_CMP),
+ LintId::of(methods::CLONE_DOUBLE_REF),
+ LintId::of(methods::CLONE_ON_COPY),
+ LintId::of(methods::ERR_EXPECT),
+ LintId::of(methods::EXPECT_FUN_CALL),
+ LintId::of(methods::EXTEND_WITH_DRAIN),
+ LintId::of(methods::FILTER_MAP_IDENTITY),
+ LintId::of(methods::FILTER_NEXT),
+ LintId::of(methods::FLAT_MAP_IDENTITY),
+ LintId::of(methods::GET_LAST_WITH_LEN),
+ LintId::of(methods::INSPECT_FOR_EACH),
+ LintId::of(methods::INTO_ITER_ON_REF),
+ LintId::of(methods::IS_DIGIT_ASCII_RADIX),
+ LintId::of(methods::ITERATOR_STEP_BY_ZERO),
+ LintId::of(methods::ITER_CLONED_COLLECT),
+ LintId::of(methods::ITER_COUNT),
+ LintId::of(methods::ITER_NEXT_SLICE),
+ LintId::of(methods::ITER_NTH),
+ LintId::of(methods::ITER_NTH_ZERO),
+ LintId::of(methods::ITER_OVEREAGER_CLONED),
+ LintId::of(methods::ITER_SKIP_NEXT),
+ LintId::of(methods::MANUAL_FILTER_MAP),
+ LintId::of(methods::MANUAL_FIND_MAP),
+ LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
+ LintId::of(methods::MANUAL_SPLIT_ONCE),
+ LintId::of(methods::MANUAL_STR_REPEAT),
+ LintId::of(methods::MAP_COLLECT_RESULT_UNIT),
+ LintId::of(methods::MAP_FLATTEN),
+ LintId::of(methods::MAP_IDENTITY),
+ LintId::of(methods::NEEDLESS_OPTION_AS_DEREF),
+ LintId::of(methods::NEEDLESS_OPTION_TAKE),
+ LintId::of(methods::NEEDLESS_SPLITN),
+ LintId::of(methods::NEW_RET_NO_SELF),
+ LintId::of(methods::NO_EFFECT_REPLACE),
++ LintId::of(methods::OBFUSCATED_IF_ELSE),
+ LintId::of(methods::OK_EXPECT),
+ LintId::of(methods::OPTION_AS_REF_DEREF),
+ LintId::of(methods::OPTION_FILTER_MAP),
+ LintId::of(methods::OPTION_MAP_OR_NONE),
+ LintId::of(methods::OR_FUN_CALL),
+ LintId::of(methods::OR_THEN_UNWRAP),
+ LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
+ LintId::of(methods::SEARCH_IS_SOME),
+ LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
+ LintId::of(methods::SINGLE_CHAR_ADD_STR),
+ LintId::of(methods::SINGLE_CHAR_PATTERN),
+ LintId::of(methods::SKIP_WHILE_NEXT),
+ LintId::of(methods::STRING_EXTEND_CHARS),
+ LintId::of(methods::SUSPICIOUS_MAP),
+ LintId::of(methods::SUSPICIOUS_SPLITN),
+ LintId::of(methods::UNINIT_ASSUMED_INIT),
+ LintId::of(methods::UNNECESSARY_FILTER_MAP),
+ LintId::of(methods::UNNECESSARY_FIND_MAP),
+ LintId::of(methods::UNNECESSARY_FOLD),
+ LintId::of(methods::UNNECESSARY_LAZY_EVALUATIONS),
+ LintId::of(methods::UNNECESSARY_TO_OWNED),
+ LintId::of(methods::UNWRAP_OR_ELSE_DEFAULT),
+ LintId::of(methods::USELESS_ASREF),
+ LintId::of(methods::WRONG_SELF_CONVENTION),
+ LintId::of(methods::ZST_OFFSET),
+ LintId::of(minmax::MIN_MAX),
+ LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
+ LintId::of(misc::TOPLEVEL_REF_ARG),
+ LintId::of(misc::ZERO_PTR),
+ LintId::of(misc_early::BUILTIN_TYPE_SHADOW),
+ LintId::of(misc_early::DOUBLE_NEG),
+ LintId::of(misc_early::DUPLICATE_UNDERSCORE_ARGUMENT),
+ LintId::of(misc_early::MIXED_CASE_HEX_LITERALS),
+ LintId::of(misc_early::REDUNDANT_PATTERN),
+ LintId::of(misc_early::UNNEEDED_WILDCARD_PATTERN),
+ LintId::of(misc_early::ZERO_PREFIXED_LITERAL),
+ LintId::of(mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION),
+ LintId::of(mut_key::MUTABLE_KEY_TYPE),
+ LintId::of(mut_mutex_lock::MUT_MUTEX_LOCK),
+ LintId::of(mut_reference::UNNECESSARY_MUT_PASSED),
+ LintId::of(needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE),
+ LintId::of(needless_bool::BOOL_COMPARISON),
+ LintId::of(needless_bool::NEEDLESS_BOOL),
+ LintId::of(needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE),
+ LintId::of(needless_late_init::NEEDLESS_LATE_INIT),
+ LintId::of(needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS),
+ LintId::of(needless_question_mark::NEEDLESS_QUESTION_MARK),
+ LintId::of(needless_update::NEEDLESS_UPDATE),
+ LintId::of(neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD),
+ LintId::of(neg_multiply::NEG_MULTIPLY),
+ LintId::of(new_without_default::NEW_WITHOUT_DEFAULT),
+ LintId::of(no_effect::NO_EFFECT),
+ LintId::of(no_effect::UNNECESSARY_OPERATION),
+ LintId::of(non_copy_const::BORROW_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
+ LintId::of(non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS),
+ LintId::of(octal_escapes::OCTAL_ESCAPES),
+ LintId::of(open_options::NONSENSICAL_OPEN_OPTIONS),
+ LintId::of(operators::ABSURD_EXTREME_COMPARISONS),
+ LintId::of(operators::ASSIGN_OP_PATTERN),
+ LintId::of(operators::BAD_BIT_MASK),
+ LintId::of(operators::CMP_NAN),
+ LintId::of(operators::CMP_OWNED),
+ LintId::of(operators::DOUBLE_COMPARISONS),
+ LintId::of(operators::DURATION_SUBSEC),
+ LintId::of(operators::EQ_OP),
+ LintId::of(operators::ERASING_OP),
+ LintId::of(operators::FLOAT_EQUALITY_WITHOUT_ABS),
+ LintId::of(operators::IDENTITY_OP),
+ LintId::of(operators::INEFFECTIVE_BIT_MASK),
+ LintId::of(operators::MISREFACTORED_ASSIGN_OP),
+ LintId::of(operators::MODULO_ONE),
+ LintId::of(operators::OP_REF),
+ LintId::of(operators::PTR_EQ),
+ LintId::of(operators::SELF_ASSIGNMENT),
+ LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
+ LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
+ LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::INVALID_NULL_PTR_USAGE),
+ LintId::of(ptr::MUT_FROM_REF),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(ranges::RANGE_ZIP_WITH_LEN),
+ LintId::of(ranges::REVERSED_EMPTY_RANGES),
+ LintId::of(rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT),
+ LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
+ LintId::of(redundant_clone::REDUNDANT_CLONE),
+ LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_slicing::REDUNDANT_SLICING),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(reference::DEREF_ADDROF),
+ LintId::of(regex::INVALID_REGEX),
+ LintId::of(repeat_once::REPEAT_ONCE),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(serde_api::SERDE_API_MISUSE),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
+ LintId::of(slow_vector_initialization::SLOW_VECTOR_INITIALIZATION),
+ LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
+ LintId::of(strings::TRIM_SPLIT_WHITESPACE),
+ LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+ LintId::of(swap::ALMOST_SWAPPED),
+ LintId::of(swap::MANUAL_SWAP),
+ LintId::of(swap_ptr_to_ref::SWAP_PTR_TO_REF),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(temporary_assignment::TEMPORARY_ASSIGNMENT),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(transmute::CROSSPOINTER_TRANSMUTE),
+ LintId::of(transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS),
+ LintId::of(transmute::TRANSMUTE_BYTES_TO_STR),
+ LintId::of(transmute::TRANSMUTE_FLOAT_TO_INT),
+ LintId::of(transmute::TRANSMUTE_INT_TO_BOOL),
+ LintId::of(transmute::TRANSMUTE_INT_TO_CHAR),
+ LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
+ LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
+ LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
+ LintId::of(transmute::USELESS_TRANSMUTE),
+ LintId::of(transmute::WRONG_TRANSMUTE),
+ LintId::of(transmuting_null::TRANSMUTING_NULL),
+ LintId::of(types::BORROWED_BOX),
+ LintId::of(types::BOX_COLLECTION),
+ LintId::of(types::REDUNDANT_ALLOCATION),
+ LintId::of(types::TYPE_COMPLEXITY),
+ LintId::of(types::VEC_BOX),
+ LintId::of(unicode::INVISIBLE_CHARACTERS),
+ LintId::of(uninit_vec::UNINIT_VEC),
+ LintId::of(unit_hash::UNIT_HASH),
+ LintId::of(unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD),
+ LintId::of(unit_types::LET_UNIT_VALUE),
+ LintId::of(unit_types::UNIT_ARG),
+ LintId::of(unit_types::UNIT_CMP),
+ LintId::of(unnamed_address::FN_ADDRESS_COMPARISONS),
+ LintId::of(unnamed_address::VTABLE_ADDRESS_COMPARISONS),
+ LintId::of(unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS),
+ LintId::of(unnecessary_sort_by::UNNECESSARY_SORT_BY),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_io_amount::UNUSED_IO_AMOUNT),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(unwrap::PANICKING_UNWRAP),
+ LintId::of(unwrap::UNNECESSARY_UNWRAP),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(useless_conversion::USELESS_CONVERSION),
+ LintId::of(vec::USELESS_VEC),
+ LintId::of(vec_init_then_push::VEC_INIT_THEN_PUSH),
+ LintId::of(vec_resize_to_zero::VEC_RESIZE_TO_ZERO),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+ LintId::of(zero_div_zero::ZERO_DIVIDED_BY_ZERO),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_lints(&[
+ #[cfg(feature = "internal")]
+ utils::internal_lints::CLIPPY_LINTS_INTERNAL,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::COMPILER_LINT_FUNCTIONS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::DEFAULT_DEPRECATION_REASON,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::DEFAULT_LINT,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::IF_CHAIN_STYLE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INTERNING_DEFINED_SYMBOL,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INVALID_PATHS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::LINT_WITHOUT_LINT_PASS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::MISSING_MSRV_ATTR_IMPL,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::OUTER_EXPN_EXPN_DATA,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::PRODUCE_ICE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::UNNECESSARY_SYMBOL_STR,
+ almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE,
+ approx_const::APPROX_CONSTANT,
+ as_conversions::AS_CONVERSIONS,
+ as_underscore::AS_UNDERSCORE,
+ asm_syntax::INLINE_ASM_X86_ATT_SYNTAX,
+ asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX,
+ assertions_on_constants::ASSERTIONS_ON_CONSTANTS,
++ assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES,
+ async_yields_async::ASYNC_YIELDS_ASYNC,
+ attrs::ALLOW_ATTRIBUTES_WITHOUT_REASON,
+ attrs::BLANKET_CLIPPY_RESTRICTION_LINTS,
+ attrs::DEPRECATED_CFG_ATTR,
+ attrs::DEPRECATED_SEMVER,
+ attrs::EMPTY_LINE_AFTER_OUTER_ATTR,
+ attrs::INLINE_ALWAYS,
+ attrs::MISMATCHED_TARGET_OS,
+ attrs::USELESS_ATTRIBUTE,
+ await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE,
+ await_holding_invalid::AWAIT_HOLDING_LOCK,
+ await_holding_invalid::AWAIT_HOLDING_REFCELL_REF,
+ blacklisted_name::BLACKLISTED_NAME,
+ blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS,
+ bool_assert_comparison::BOOL_ASSERT_COMPARISON,
+ booleans::LOGIC_BUG,
+ booleans::NONMINIMAL_BOOL,
+ borrow_as_ptr::BORROW_AS_PTR,
+ borrow_deref_ref::BORROW_DEREF_REF,
+ bytecount::NAIVE_BYTECOUNT,
+ bytes_count_to_len::BYTES_COUNT_TO_LEN,
+ cargo::CARGO_COMMON_METADATA,
+ cargo::MULTIPLE_CRATE_VERSIONS,
+ cargo::NEGATIVE_FEATURE_NAMES,
+ cargo::REDUNDANT_FEATURE_NAMES,
+ cargo::WILDCARD_DEPENDENCIES,
+ case_sensitive_file_extension_comparisons::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ casts::CAST_ABS_TO_UNSIGNED,
+ casts::CAST_ENUM_CONSTRUCTOR,
+ casts::CAST_ENUM_TRUNCATION,
+ casts::CAST_LOSSLESS,
+ casts::CAST_POSSIBLE_TRUNCATION,
+ casts::CAST_POSSIBLE_WRAP,
+ casts::CAST_PRECISION_LOSS,
+ casts::CAST_PTR_ALIGNMENT,
+ casts::CAST_REF_TO_MUT,
+ casts::CAST_SIGN_LOSS,
+ casts::CAST_SLICE_DIFFERENT_SIZES,
+ casts::CHAR_LIT_AS_U8,
+ casts::FN_TO_NUMERIC_CAST,
+ casts::FN_TO_NUMERIC_CAST_ANY,
+ casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION,
+ casts::PTR_AS_PTR,
+ casts::UNNECESSARY_CAST,
+ checked_conversions::CHECKED_CONVERSIONS,
+ cognitive_complexity::COGNITIVE_COMPLEXITY,
+ collapsible_if::COLLAPSIBLE_ELSE_IF,
+ collapsible_if::COLLAPSIBLE_IF,
+ comparison_chain::COMPARISON_CHAIN,
+ copies::BRANCHES_SHARING_CODE,
+ copies::IFS_SAME_COND,
+ copies::IF_SAME_THEN_ELSE,
+ copies::SAME_FUNCTIONS_IN_IF_CONDITION,
+ copy_iterator::COPY_ITERATOR,
+ crate_in_macro_def::CRATE_IN_MACRO_DEF,
+ create_dir::CREATE_DIR,
+ dbg_macro::DBG_MACRO,
+ default::DEFAULT_TRAIT_ACCESS,
+ default::FIELD_REASSIGN_WITH_DEFAULT,
+ default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY,
+ default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK,
+ default_union_representation::DEFAULT_UNION_REPRESENTATION,
+ dereference::EXPLICIT_AUTO_DEREF,
+ dereference::EXPLICIT_DEREF_METHODS,
+ dereference::NEEDLESS_BORROW,
+ dereference::REF_BINDING_TO_REFERENCE,
+ derivable_impls::DERIVABLE_IMPLS,
+ derive::DERIVE_HASH_XOR_EQ,
+ derive::DERIVE_ORD_XOR_PARTIAL_ORD,
+ derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ,
+ derive::EXPL_IMPL_CLONE_ON_COPY,
+ derive::UNSAFE_DERIVE_DESERIALIZE,
+ disallowed_methods::DISALLOWED_METHODS,
+ disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS,
+ disallowed_types::DISALLOWED_TYPES,
+ doc::DOC_MARKDOWN,
+ doc::MISSING_ERRORS_DOC,
+ doc::MISSING_PANICS_DOC,
+ doc::MISSING_SAFETY_DOC,
+ doc::NEEDLESS_DOCTEST_MAIN,
+ doc_link_with_quotes::DOC_LINK_WITH_QUOTES,
+ double_parens::DOUBLE_PARENS,
+ drop_forget_ref::DROP_COPY,
+ drop_forget_ref::DROP_NON_DROP,
+ drop_forget_ref::DROP_REF,
+ drop_forget_ref::FORGET_COPY,
+ drop_forget_ref::FORGET_NON_DROP,
+ drop_forget_ref::FORGET_REF,
+ drop_forget_ref::UNDROPPED_MANUALLY_DROPS,
+ duplicate_mod::DUPLICATE_MOD,
+ else_if_without_else::ELSE_IF_WITHOUT_ELSE,
+ empty_drop::EMPTY_DROP,
+ empty_enum::EMPTY_ENUM,
+ empty_structs_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS,
+ entry::MAP_ENTRY,
+ enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT,
+ enum_variants::ENUM_VARIANT_NAMES,
+ enum_variants::MODULE_INCEPTION,
+ enum_variants::MODULE_NAME_REPETITIONS,
+ equatable_if_let::EQUATABLE_IF_LET,
+ escape::BOXED_LOCAL,
+ eta_reduction::REDUNDANT_CLOSURE,
+ eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS,
+ excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS,
+ excessive_bools::STRUCT_EXCESSIVE_BOOLS,
+ exhaustive_items::EXHAUSTIVE_ENUMS,
+ exhaustive_items::EXHAUSTIVE_STRUCTS,
+ exit::EXIT,
+ explicit_write::EXPLICIT_WRITE,
+ fallible_impl_from::FALLIBLE_IMPL_FROM,
+ float_literal::EXCESSIVE_PRECISION,
+ float_literal::LOSSY_FLOAT_LITERAL,
+ floating_point_arithmetic::IMPRECISE_FLOPS,
+ floating_point_arithmetic::SUBOPTIMAL_FLOPS,
+ format::USELESS_FORMAT,
+ format_args::FORMAT_IN_FORMAT_ARGS,
+ format_args::TO_STRING_IN_FORMAT_ARGS,
+ format_impl::PRINT_IN_FORMAT_IMPL,
+ format_impl::RECURSIVE_FORMAT_IMPL,
+ format_push_string::FORMAT_PUSH_STRING,
+ formatting::POSSIBLE_MISSING_COMMA,
+ formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ formatting::SUSPICIOUS_ELSE_FORMATTING,
+ formatting::SUSPICIOUS_UNARY_OP_FORMATTING,
+ from_over_into::FROM_OVER_INTO,
+ from_str_radix_10::FROM_STR_RADIX_10,
+ functions::DOUBLE_MUST_USE,
+ functions::MUST_USE_CANDIDATE,
+ functions::MUST_USE_UNIT,
+ functions::NOT_UNSAFE_PTR_ARG_DEREF,
+ functions::RESULT_UNIT_ERR,
+ functions::TOO_MANY_ARGUMENTS,
+ functions::TOO_MANY_LINES,
+ future_not_send::FUTURE_NOT_SEND,
+ get_first::GET_FIRST,
+ if_let_mutex::IF_LET_MUTEX,
+ if_not_else::IF_NOT_ELSE,
+ if_then_some_else_none::IF_THEN_SOME_ELSE_NONE,
+ implicit_hasher::IMPLICIT_HASHER,
+ implicit_return::IMPLICIT_RETURN,
+ implicit_saturating_sub::IMPLICIT_SATURATING_SUB,
+ inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR,
+ index_refutable_slice::INDEX_REFUTABLE_SLICE,
+ indexing_slicing::INDEXING_SLICING,
+ indexing_slicing::OUT_OF_BOUNDS_INDEXING,
+ infinite_iter::INFINITE_ITER,
+ infinite_iter::MAYBE_INFINITE_ITER,
+ inherent_impl::MULTIPLE_INHERENT_IMPL,
+ inherent_to_string::INHERENT_TO_STRING,
+ inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY,
+ init_numbered_fields::INIT_NUMBERED_FIELDS,
+ inline_fn_without_body::INLINE_FN_WITHOUT_BODY,
+ int_plus_one::INT_PLUS_ONE,
+ invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS,
+ invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED,
+ items_after_statements::ITEMS_AFTER_STATEMENTS,
+ iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR,
+ large_const_arrays::LARGE_CONST_ARRAYS,
+ large_enum_variant::LARGE_ENUM_VARIANT,
+ large_include_file::LARGE_INCLUDE_FILE,
+ large_stack_arrays::LARGE_STACK_ARRAYS,
+ len_zero::COMPARISON_TO_EMPTY,
+ len_zero::LEN_WITHOUT_IS_EMPTY,
+ len_zero::LEN_ZERO,
+ let_if_seq::USELESS_LET_IF_SEQ,
+ let_underscore::LET_UNDERSCORE_DROP,
+ let_underscore::LET_UNDERSCORE_LOCK,
+ let_underscore::LET_UNDERSCORE_MUST_USE,
+ lifetimes::EXTRA_UNUSED_LIFETIMES,
+ lifetimes::NEEDLESS_LIFETIMES,
+ literal_representation::DECIMAL_LITERAL_REPRESENTATION,
+ literal_representation::INCONSISTENT_DIGIT_GROUPING,
+ literal_representation::LARGE_DIGIT_GROUPS,
+ literal_representation::MISTYPED_LITERAL_SUFFIXES,
+ literal_representation::UNREADABLE_LITERAL,
+ literal_representation::UNUSUAL_BYTE_GROUPINGS,
+ loops::EMPTY_LOOP,
+ loops::EXPLICIT_COUNTER_LOOP,
+ loops::EXPLICIT_INTO_ITER_LOOP,
+ loops::EXPLICIT_ITER_LOOP,
+ loops::FOR_KV_MAP,
+ loops::FOR_LOOPS_OVER_FALLIBLES,
+ loops::ITER_NEXT_LOOP,
+ loops::MANUAL_FIND,
+ loops::MANUAL_FLATTEN,
+ loops::MANUAL_MEMCPY,
+ loops::MISSING_SPIN_LOOP,
+ loops::MUT_RANGE_BOUND,
+ loops::NEEDLESS_COLLECT,
+ loops::NEEDLESS_RANGE_LOOP,
+ loops::NEVER_LOOP,
+ loops::SAME_ITEM_PUSH,
+ loops::SINGLE_ELEMENT_LOOP,
+ loops::WHILE_IMMUTABLE_CONDITION,
+ loops::WHILE_LET_LOOP,
+ loops::WHILE_LET_ON_ITERATOR,
+ macro_use::MACRO_USE_IMPORTS,
+ main_recursion::MAIN_RECURSION,
+ manual_assert::MANUAL_ASSERT,
+ manual_async_fn::MANUAL_ASYNC_FN,
+ manual_bits::MANUAL_BITS,
+ manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE,
+ manual_ok_or::MANUAL_OK_OR,
+ manual_rem_euclid::MANUAL_REM_EUCLID,
+ manual_retain::MANUAL_RETAIN,
+ manual_strip::MANUAL_STRIP,
+ map_clone::MAP_CLONE,
+ map_err_ignore::MAP_ERR_IGNORE,
+ map_unit_fn::OPTION_MAP_UNIT_FN,
+ map_unit_fn::RESULT_MAP_UNIT_FN,
+ match_result_ok::MATCH_RESULT_OK,
+ matches::COLLAPSIBLE_MATCH,
+ matches::INFALLIBLE_DESTRUCTURING_MATCH,
+ matches::MANUAL_MAP,
+ matches::MANUAL_UNWRAP_OR,
+ matches::MATCH_AS_REF,
+ matches::MATCH_BOOL,
+ matches::MATCH_LIKE_MATCHES_MACRO,
+ matches::MATCH_ON_VEC_ITEMS,
+ matches::MATCH_OVERLAPPING_ARM,
+ matches::MATCH_REF_PATS,
+ matches::MATCH_SAME_ARMS,
+ matches::MATCH_SINGLE_BINDING,
+ matches::MATCH_STR_CASE_MISMATCH,
+ matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ matches::MATCH_WILD_ERR_ARM,
+ matches::NEEDLESS_MATCH,
+ matches::REDUNDANT_PATTERN_MATCHING,
+ matches::REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ matches::SIGNIFICANT_DROP_IN_SCRUTINEE,
+ matches::SINGLE_MATCH,
+ matches::SINGLE_MATCH_ELSE,
+ matches::TRY_ERR,
+ matches::WILDCARD_ENUM_MATCH_ARM,
+ matches::WILDCARD_IN_OR_PATTERNS,
+ mem_forget::MEM_FORGET,
+ mem_replace::MEM_REPLACE_OPTION_WITH_NONE,
+ mem_replace::MEM_REPLACE_WITH_DEFAULT,
+ mem_replace::MEM_REPLACE_WITH_UNINIT,
+ methods::BIND_INSTEAD_OF_MAP,
+ methods::BYTES_NTH,
+ methods::CHARS_LAST_CMP,
+ methods::CHARS_NEXT_CMP,
+ methods::CLONED_INSTEAD_OF_COPIED,
+ methods::CLONE_DOUBLE_REF,
+ methods::CLONE_ON_COPY,
+ methods::CLONE_ON_REF_PTR,
+ methods::ERR_EXPECT,
+ methods::EXPECT_FUN_CALL,
+ methods::EXPECT_USED,
+ methods::EXTEND_WITH_DRAIN,
+ methods::FILETYPE_IS_FILE,
+ methods::FILTER_MAP_IDENTITY,
+ methods::FILTER_MAP_NEXT,
+ methods::FILTER_NEXT,
+ methods::FLAT_MAP_IDENTITY,
+ methods::FLAT_MAP_OPTION,
+ methods::FROM_ITER_INSTEAD_OF_COLLECT,
+ methods::GET_LAST_WITH_LEN,
+ methods::GET_UNWRAP,
+ methods::IMPLICIT_CLONE,
+ methods::INEFFICIENT_TO_STRING,
+ methods::INSPECT_FOR_EACH,
+ methods::INTO_ITER_ON_REF,
+ methods::IS_DIGIT_ASCII_RADIX,
+ methods::ITERATOR_STEP_BY_ZERO,
+ methods::ITER_CLONED_COLLECT,
+ methods::ITER_COUNT,
+ methods::ITER_NEXT_SLICE,
+ methods::ITER_NTH,
+ methods::ITER_NTH_ZERO,
+ methods::ITER_OVEREAGER_CLONED,
+ methods::ITER_SKIP_NEXT,
+ methods::ITER_WITH_DRAIN,
+ methods::MANUAL_FILTER_MAP,
+ methods::MANUAL_FIND_MAP,
+ methods::MANUAL_SATURATING_ARITHMETIC,
+ methods::MANUAL_SPLIT_ONCE,
+ methods::MANUAL_STR_REPEAT,
+ methods::MAP_COLLECT_RESULT_UNIT,
+ methods::MAP_FLATTEN,
+ methods::MAP_IDENTITY,
+ methods::MAP_UNWRAP_OR,
+ methods::NEEDLESS_OPTION_AS_DEREF,
+ methods::NEEDLESS_OPTION_TAKE,
+ methods::NEEDLESS_SPLITN,
+ methods::NEW_RET_NO_SELF,
+ methods::NO_EFFECT_REPLACE,
++ methods::OBFUSCATED_IF_ELSE,
+ methods::OK_EXPECT,
+ methods::OPTION_AS_REF_DEREF,
+ methods::OPTION_FILTER_MAP,
+ methods::OPTION_MAP_OR_NONE,
+ methods::OR_FUN_CALL,
+ methods::OR_THEN_UNWRAP,
+ methods::RESULT_MAP_OR_INTO_OPTION,
+ methods::SEARCH_IS_SOME,
+ methods::SHOULD_IMPLEMENT_TRAIT,
+ methods::SINGLE_CHAR_ADD_STR,
+ methods::SINGLE_CHAR_PATTERN,
+ methods::SKIP_WHILE_NEXT,
+ methods::STRING_EXTEND_CHARS,
+ methods::SUSPICIOUS_MAP,
+ methods::SUSPICIOUS_SPLITN,
+ methods::UNINIT_ASSUMED_INIT,
+ methods::UNNECESSARY_FILTER_MAP,
+ methods::UNNECESSARY_FIND_MAP,
+ methods::UNNECESSARY_FOLD,
+ methods::UNNECESSARY_JOIN,
+ methods::UNNECESSARY_LAZY_EVALUATIONS,
+ methods::UNNECESSARY_TO_OWNED,
+ methods::UNWRAP_OR_ELSE_DEFAULT,
+ methods::UNWRAP_USED,
+ methods::USELESS_ASREF,
+ methods::WRONG_SELF_CONVENTION,
+ methods::ZST_OFFSET,
+ minmax::MIN_MAX,
+ misc::SHORT_CIRCUIT_STATEMENT,
+ misc::TOPLEVEL_REF_ARG,
+ misc::USED_UNDERSCORE_BINDING,
+ misc::ZERO_PTR,
+ misc_early::BUILTIN_TYPE_SHADOW,
+ misc_early::DOUBLE_NEG,
+ misc_early::DUPLICATE_UNDERSCORE_ARGUMENT,
+ misc_early::MIXED_CASE_HEX_LITERALS,
+ misc_early::REDUNDANT_PATTERN,
+ misc_early::SEPARATED_LITERAL_SUFFIX,
+ misc_early::UNNEEDED_FIELD_PATTERN,
+ misc_early::UNNEEDED_WILDCARD_PATTERN,
+ misc_early::UNSEPARATED_LITERAL_SUFFIX,
+ misc_early::ZERO_PREFIXED_LITERAL,
+ mismatching_type_param_order::MISMATCHING_TYPE_PARAM_ORDER,
+ missing_const_for_fn::MISSING_CONST_FOR_FN,
+ missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS,
+ missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES,
+ missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS,
+ mixed_read_write_in_expression::DIVERGING_SUB_EXPRESSION,
+ mixed_read_write_in_expression::MIXED_READ_WRITE_IN_EXPRESSION,
+ module_style::MOD_MODULE_FILES,
+ module_style::SELF_NAMED_MODULE_FILES,
+ mut_key::MUTABLE_KEY_TYPE,
+ mut_mut::MUT_MUT,
+ mut_mutex_lock::MUT_MUTEX_LOCK,
+ mut_reference::UNNECESSARY_MUT_PASSED,
+ mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL,
+ mutex_atomic::MUTEX_ATOMIC,
+ mutex_atomic::MUTEX_INTEGER,
+ needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE,
+ needless_bool::BOOL_COMPARISON,
+ needless_bool::NEEDLESS_BOOL,
+ needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE,
+ needless_continue::NEEDLESS_CONTINUE,
+ needless_for_each::NEEDLESS_FOR_EACH,
+ needless_late_init::NEEDLESS_LATE_INIT,
+ needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS,
+ needless_pass_by_value::NEEDLESS_PASS_BY_VALUE,
+ needless_question_mark::NEEDLESS_QUESTION_MARK,
+ needless_update::NEEDLESS_UPDATE,
+ neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD,
+ neg_multiply::NEG_MULTIPLY,
+ new_without_default::NEW_WITHOUT_DEFAULT,
+ no_effect::NO_EFFECT,
+ no_effect::NO_EFFECT_UNDERSCORE_BINDING,
+ no_effect::UNNECESSARY_OPERATION,
+ non_copy_const::BORROW_INTERIOR_MUTABLE_CONST,
+ non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST,
+ non_expressive_names::JUST_UNDERSCORES_AND_DIGITS,
+ non_expressive_names::MANY_SINGLE_CHAR_NAMES,
+ non_expressive_names::SIMILAR_NAMES,
+ non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS,
+ non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY,
+ nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES,
+ octal_escapes::OCTAL_ESCAPES,
+ only_used_in_recursion::ONLY_USED_IN_RECURSION,
+ open_options::NONSENSICAL_OPEN_OPTIONS,
+ operators::ABSURD_EXTREME_COMPARISONS,
++ operators::ARITHMETIC,
+ operators::ASSIGN_OP_PATTERN,
+ operators::BAD_BIT_MASK,
+ operators::CMP_NAN,
+ operators::CMP_OWNED,
+ operators::DOUBLE_COMPARISONS,
+ operators::DURATION_SUBSEC,
+ operators::EQ_OP,
+ operators::ERASING_OP,
+ operators::FLOAT_ARITHMETIC,
+ operators::FLOAT_CMP,
+ operators::FLOAT_CMP_CONST,
+ operators::FLOAT_EQUALITY_WITHOUT_ABS,
+ operators::IDENTITY_OP,
+ operators::INEFFECTIVE_BIT_MASK,
+ operators::INTEGER_ARITHMETIC,
+ operators::INTEGER_DIVISION,
+ operators::MISREFACTORED_ASSIGN_OP,
+ operators::MODULO_ARITHMETIC,
+ operators::MODULO_ONE,
+ operators::NEEDLESS_BITWISE_BOOL,
+ operators::OP_REF,
+ operators::PTR_EQ,
+ operators::SELF_ASSIGNMENT,
+ operators::VERBOSE_BIT_MASK,
+ option_env_unwrap::OPTION_ENV_UNWRAP,
+ option_if_let_else::OPTION_IF_LET_ELSE,
+ overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL,
+ panic_in_result_fn::PANIC_IN_RESULT_FN,
+ panic_unimplemented::PANIC,
+ panic_unimplemented::TODO,
+ panic_unimplemented::UNIMPLEMENTED,
+ panic_unimplemented::UNREACHABLE,
+ partialeq_ne_impl::PARTIALEQ_NE_IMPL,
+ pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE,
+ pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF,
+ path_buf_push_overwrite::PATH_BUF_PUSH_OVERWRITE,
+ pattern_type_mismatch::PATTERN_TYPE_MISMATCH,
+ precedence::PRECEDENCE,
+ ptr::CMP_NULL,
+ ptr::INVALID_NULL_PTR_USAGE,
+ ptr::MUT_FROM_REF,
+ ptr::PTR_ARG,
+ ptr_offset_with_cast::PTR_OFFSET_WITH_CAST,
+ pub_use::PUB_USE,
+ question_mark::QUESTION_MARK,
+ ranges::MANUAL_RANGE_CONTAINS,
+ ranges::RANGE_MINUS_ONE,
+ ranges::RANGE_PLUS_ONE,
+ ranges::RANGE_ZIP_WITH_LEN,
+ ranges::REVERSED_EMPTY_RANGES,
+ rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT,
+ read_zero_byte_vec::READ_ZERO_BYTE_VEC,
+ redundant_clone::REDUNDANT_CLONE,
+ redundant_closure_call::REDUNDANT_CLOSURE_CALL,
+ redundant_else::REDUNDANT_ELSE,
+ redundant_field_names::REDUNDANT_FIELD_NAMES,
+ redundant_pub_crate::REDUNDANT_PUB_CRATE,
+ redundant_slicing::DEREF_BY_SLICING,
+ redundant_slicing::REDUNDANT_SLICING,
+ redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
+ ref_option_ref::REF_OPTION_REF,
+ reference::DEREF_ADDROF,
+ regex::INVALID_REGEX,
+ regex::TRIVIAL_REGEX,
+ repeat_once::REPEAT_ONCE,
+ return_self_not_must_use::RETURN_SELF_NOT_MUST_USE,
+ returns::LET_AND_RETURN,
+ returns::NEEDLESS_RETURN,
+ same_name_method::SAME_NAME_METHOD,
+ self_named_constructors::SELF_NAMED_CONSTRUCTORS,
+ semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED,
+ serde_api::SERDE_API_MISUSE,
+ shadow::SHADOW_REUSE,
+ shadow::SHADOW_SAME,
+ shadow::SHADOW_UNRELATED,
+ single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES,
+ single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS,
+ size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT,
+ slow_vector_initialization::SLOW_VECTOR_INITIALIZATION,
+ stable_sort_primitive::STABLE_SORT_PRIMITIVE,
+ std_instead_of_core::ALLOC_INSTEAD_OF_CORE,
+ std_instead_of_core::STD_INSTEAD_OF_ALLOC,
+ std_instead_of_core::STD_INSTEAD_OF_CORE,
+ strings::STRING_ADD,
+ strings::STRING_ADD_ASSIGN,
+ strings::STRING_FROM_UTF8_AS_BYTES,
+ strings::STRING_LIT_AS_BYTES,
+ strings::STRING_SLICE,
+ strings::STRING_TO_STRING,
+ strings::STR_TO_STRING,
+ strings::TRIM_SPLIT_WHITESPACE,
+ strlen_on_c_strings::STRLEN_ON_C_STRINGS,
+ suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS,
+ suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL,
+ suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL,
+ swap::ALMOST_SWAPPED,
+ swap::MANUAL_SWAP,
+ swap_ptr_to_ref::SWAP_PTR_TO_REF,
+ tabs_in_doc_comments::TABS_IN_DOC_COMMENTS,
+ temporary_assignment::TEMPORARY_ASSIGNMENT,
+ to_digit_is_some::TO_DIGIT_IS_SOME,
+ trailing_empty_array::TRAILING_EMPTY_ARRAY,
+ trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS,
+ trait_bounds::TYPE_REPETITION_IN_BOUNDS,
+ transmute::CROSSPOINTER_TRANSMUTE,
+ transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
+ transmute::TRANSMUTE_BYTES_TO_STR,
+ transmute::TRANSMUTE_FLOAT_TO_INT,
+ transmute::TRANSMUTE_INT_TO_BOOL,
+ transmute::TRANSMUTE_INT_TO_CHAR,
+ transmute::TRANSMUTE_INT_TO_FLOAT,
+ transmute::TRANSMUTE_NUM_TO_BYTES,
+ transmute::TRANSMUTE_PTR_TO_PTR,
+ transmute::TRANSMUTE_PTR_TO_REF,
+ transmute::TRANSMUTE_UNDEFINED_REPR,
+ transmute::UNSOUND_COLLECTION_TRANSMUTE,
+ transmute::USELESS_TRANSMUTE,
+ transmute::WRONG_TRANSMUTE,
+ transmuting_null::TRANSMUTING_NULL,
+ types::BORROWED_BOX,
+ types::BOX_COLLECTION,
+ types::LINKEDLIST,
+ types::OPTION_OPTION,
+ types::RC_BUFFER,
+ types::RC_MUTEX,
+ types::REDUNDANT_ALLOCATION,
+ types::TYPE_COMPLEXITY,
+ types::VEC_BOX,
+ undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS,
+ unicode::INVISIBLE_CHARACTERS,
+ unicode::NON_ASCII_LITERAL,
+ unicode::UNICODE_NOT_NFC,
+ uninit_vec::UNINIT_VEC,
+ unit_hash::UNIT_HASH,
+ unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD,
+ unit_types::LET_UNIT_VALUE,
+ unit_types::UNIT_ARG,
+ unit_types::UNIT_CMP,
+ unnamed_address::FN_ADDRESS_COMPARISONS,
+ unnamed_address::VTABLE_ADDRESS_COMPARISONS,
+ unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS,
+ unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS,
+ unnecessary_sort_by::UNNECESSARY_SORT_BY,
+ unnecessary_wraps::UNNECESSARY_WRAPS,
+ unnested_or_patterns::UNNESTED_OR_PATTERNS,
+ unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME,
+ unused_async::UNUSED_ASYNC,
+ unused_io_amount::UNUSED_IO_AMOUNT,
+ unused_rounding::UNUSED_ROUNDING,
+ unused_self::UNUSED_SELF,
+ unused_unit::UNUSED_UNIT,
+ unwrap::PANICKING_UNWRAP,
+ unwrap::UNNECESSARY_UNWRAP,
+ unwrap_in_result::UNWRAP_IN_RESULT,
+ upper_case_acronyms::UPPER_CASE_ACRONYMS,
+ use_self::USE_SELF,
+ useless_conversion::USELESS_CONVERSION,
+ vec::USELESS_VEC,
+ vec_init_then_push::VEC_INIT_THEN_PUSH,
+ vec_resize_to_zero::VEC_RESIZE_TO_ZERO,
+ verbose_file_reads::VERBOSE_FILE_READS,
+ wildcard_imports::ENUM_GLOB_USE,
+ wildcard_imports::WILDCARD_IMPORTS,
+ write::PRINTLN_EMPTY_STRING,
+ write::PRINT_LITERAL,
+ write::PRINT_STDERR,
+ write::PRINT_STDOUT,
+ write::PRINT_WITH_NEWLINE,
+ write::USE_DEBUG,
+ write::WRITELN_EMPTY_STRING,
+ write::WRITE_LITERAL,
+ write::WRITE_WITH_NEWLINE,
+ zero_div_zero::ZERO_DIVIDED_BY_ZERO,
+ zero_sized_map_values::ZERO_SIZED_MAP_VALUES,
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
+ LintId::of(as_conversions::AS_CONVERSIONS),
+ LintId::of(as_underscore::AS_UNDERSCORE),
+ LintId::of(asm_syntax::INLINE_ASM_X86_ATT_SYNTAX),
+ LintId::of(asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX),
+ LintId::of(attrs::ALLOW_ATTRIBUTES_WITHOUT_REASON),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_ANY),
+ LintId::of(create_dir::CREATE_DIR),
+ LintId::of(dbg_macro::DBG_MACRO),
+ LintId::of(default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK),
+ LintId::of(default_union_representation::DEFAULT_UNION_REPRESENTATION),
+ LintId::of(disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS),
+ LintId::of(else_if_without_else::ELSE_IF_WITHOUT_ELSE),
+ LintId::of(empty_drop::EMPTY_DROP),
+ LintId::of(empty_structs_with_brackets::EMPTY_STRUCTS_WITH_BRACKETS),
+ LintId::of(exhaustive_items::EXHAUSTIVE_ENUMS),
+ LintId::of(exhaustive_items::EXHAUSTIVE_STRUCTS),
+ LintId::of(exit::EXIT),
+ LintId::of(float_literal::LOSSY_FLOAT_LITERAL),
+ LintId::of(format_push_string::FORMAT_PUSH_STRING),
+ LintId::of(if_then_some_else_none::IF_THEN_SOME_ELSE_NONE),
+ LintId::of(implicit_return::IMPLICIT_RETURN),
+ LintId::of(indexing_slicing::INDEXING_SLICING),
+ LintId::of(inherent_impl::MULTIPLE_INHERENT_IMPL),
+ LintId::of(large_include_file::LARGE_INCLUDE_FILE),
+ LintId::of(let_underscore::LET_UNDERSCORE_MUST_USE),
+ LintId::of(literal_representation::DECIMAL_LITERAL_REPRESENTATION),
+ LintId::of(map_err_ignore::MAP_ERR_IGNORE),
+ LintId::of(matches::REST_PAT_IN_FULLY_BOUND_STRUCTS),
+ LintId::of(matches::TRY_ERR),
+ LintId::of(matches::WILDCARD_ENUM_MATCH_ARM),
+ LintId::of(mem_forget::MEM_FORGET),
+ LintId::of(methods::CLONE_ON_REF_PTR),
+ LintId::of(methods::EXPECT_USED),
+ LintId::of(methods::FILETYPE_IS_FILE),
+ LintId::of(methods::GET_UNWRAP),
+ LintId::of(methods::UNWRAP_USED),
+ LintId::of(misc_early::SEPARATED_LITERAL_SUFFIX),
+ LintId::of(misc_early::UNNEEDED_FIELD_PATTERN),
+ LintId::of(misc_early::UNSEPARATED_LITERAL_SUFFIX),
+ LintId::of(missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS),
+ LintId::of(missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES),
+ LintId::of(missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS),
+ LintId::of(mixed_read_write_in_expression::MIXED_READ_WRITE_IN_EXPRESSION),
+ LintId::of(module_style::MOD_MODULE_FILES),
+ LintId::of(module_style::SELF_NAMED_MODULE_FILES),
++ LintId::of(operators::ARITHMETIC),
+ LintId::of(operators::FLOAT_ARITHMETIC),
+ LintId::of(operators::FLOAT_CMP_CONST),
+ LintId::of(operators::INTEGER_ARITHMETIC),
+ LintId::of(operators::INTEGER_DIVISION),
+ LintId::of(operators::MODULO_ARITHMETIC),
+ LintId::of(panic_in_result_fn::PANIC_IN_RESULT_FN),
+ LintId::of(panic_unimplemented::PANIC),
+ LintId::of(panic_unimplemented::TODO),
+ LintId::of(panic_unimplemented::UNIMPLEMENTED),
+ LintId::of(panic_unimplemented::UNREACHABLE),
+ LintId::of(pattern_type_mismatch::PATTERN_TYPE_MISMATCH),
+ LintId::of(pub_use::PUB_USE),
+ LintId::of(redundant_slicing::DEREF_BY_SLICING),
+ LintId::of(same_name_method::SAME_NAME_METHOD),
+ LintId::of(shadow::SHADOW_REUSE),
+ LintId::of(shadow::SHADOW_SAME),
+ LintId::of(shadow::SHADOW_UNRELATED),
+ LintId::of(single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES),
+ LintId::of(std_instead_of_core::ALLOC_INSTEAD_OF_CORE),
+ LintId::of(std_instead_of_core::STD_INSTEAD_OF_ALLOC),
+ LintId::of(std_instead_of_core::STD_INSTEAD_OF_CORE),
+ LintId::of(strings::STRING_ADD),
+ LintId::of(strings::STRING_SLICE),
+ LintId::of(strings::STRING_TO_STRING),
+ LintId::of(strings::STR_TO_STRING),
+ LintId::of(types::RC_BUFFER),
+ LintId::of(types::RC_MUTEX),
+ LintId::of(undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS),
+ LintId::of(unicode::NON_ASCII_LITERAL),
+ LintId::of(unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS),
+ LintId::of(unwrap_in_result::UNWRAP_IN_RESULT),
+ LintId::of(verbose_file_reads::VERBOSE_FILE_READS),
+ LintId::of(write::PRINT_STDERR),
+ LintId::of(write::PRINT_STDOUT),
+ LintId::of(write::USE_DEBUG),
+])
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::style", Some("clippy_style"), vec![
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
++ LintId::of(assertions_on_result_states::ASSERTIONS_ON_RESULT_STATES),
+ LintId::of(blacklisted_name::BLACKLISTED_NAME),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(casts::FN_TO_NUMERIC_CAST),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
+ LintId::of(collapsible_if::COLLAPSIBLE_ELSE_IF),
+ LintId::of(collapsible_if::COLLAPSIBLE_IF),
+ LintId::of(comparison_chain::COMPARISON_CHAIN),
+ LintId::of(default::FIELD_REASSIGN_WITH_DEFAULT),
+ LintId::of(default_instead_of_iter_empty::DEFAULT_INSTEAD_OF_ITER_EMPTY),
+ LintId::of(dereference::NEEDLESS_BORROW),
+ LintId::of(derive::DERIVE_PARTIAL_EQ_WITHOUT_EQ),
+ LintId::of(disallowed_methods::DISALLOWED_METHODS),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(from_over_into::FROM_OVER_INTO),
+ LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
+ LintId::of(functions::DOUBLE_MUST_USE),
+ LintId::of(functions::MUST_USE_UNIT),
+ LintId::of(functions::RESULT_UNIT_ERR),
+ LintId::of(get_first::GET_FIRST),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING),
+ LintId::of(init_numbered_fields::INIT_NUMBERED_FIELDS),
+ LintId::of(len_zero::COMPARISON_TO_EMPTY),
+ LintId::of(len_zero::LEN_WITHOUT_IS_EMPTY),
+ LintId::of(len_zero::LEN_ZERO),
+ LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
+ LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
+ LintId::of(loops::FOR_KV_MAP),
+ LintId::of(loops::NEEDLESS_RANGE_LOOP),
+ LintId::of(loops::SAME_ITEM_PUSH),
+ LintId::of(loops::WHILE_LET_ON_ITERATOR),
+ LintId::of(main_recursion::MAIN_RECURSION),
+ LintId::of(manual_async_fn::MANUAL_ASYNC_FN),
+ LintId::of(manual_bits::MANUAL_BITS),
+ LintId::of(manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
+ LintId::of(map_clone::MAP_CLONE),
+ LintId::of(match_result_ok::MATCH_RESULT_OK),
+ LintId::of(matches::COLLAPSIBLE_MATCH),
+ LintId::of(matches::INFALLIBLE_DESTRUCTURING_MATCH),
+ LintId::of(matches::MANUAL_MAP),
+ LintId::of(matches::MATCH_LIKE_MATCHES_MACRO),
+ LintId::of(matches::MATCH_OVERLAPPING_ARM),
+ LintId::of(matches::MATCH_REF_PATS),
+ LintId::of(matches::REDUNDANT_PATTERN_MATCHING),
+ LintId::of(matches::SINGLE_MATCH),
+ LintId::of(mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_DEFAULT),
+ LintId::of(methods::BYTES_NTH),
+ LintId::of(methods::CHARS_LAST_CMP),
+ LintId::of(methods::CHARS_NEXT_CMP),
+ LintId::of(methods::ERR_EXPECT),
+ LintId::of(methods::INTO_ITER_ON_REF),
+ LintId::of(methods::IS_DIGIT_ASCII_RADIX),
+ LintId::of(methods::ITER_CLONED_COLLECT),
+ LintId::of(methods::ITER_NEXT_SLICE),
+ LintId::of(methods::ITER_NTH_ZERO),
+ LintId::of(methods::ITER_SKIP_NEXT),
+ LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
+ LintId::of(methods::MAP_COLLECT_RESULT_UNIT),
+ LintId::of(methods::NEW_RET_NO_SELF),
++ LintId::of(methods::OBFUSCATED_IF_ELSE),
+ LintId::of(methods::OK_EXPECT),
+ LintId::of(methods::OPTION_MAP_OR_NONE),
+ LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
+ LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
+ LintId::of(methods::SINGLE_CHAR_ADD_STR),
+ LintId::of(methods::STRING_EXTEND_CHARS),
+ LintId::of(methods::UNNECESSARY_FOLD),
+ LintId::of(methods::UNNECESSARY_LAZY_EVALUATIONS),
+ LintId::of(methods::UNWRAP_OR_ELSE_DEFAULT),
+ LintId::of(methods::WRONG_SELF_CONVENTION),
+ LintId::of(misc::TOPLEVEL_REF_ARG),
+ LintId::of(misc::ZERO_PTR),
+ LintId::of(misc_early::BUILTIN_TYPE_SHADOW),
+ LintId::of(misc_early::DOUBLE_NEG),
+ LintId::of(misc_early::DUPLICATE_UNDERSCORE_ARGUMENT),
+ LintId::of(misc_early::MIXED_CASE_HEX_LITERALS),
+ LintId::of(misc_early::REDUNDANT_PATTERN),
+ LintId::of(mut_mutex_lock::MUT_MUTEX_LOCK),
+ LintId::of(mut_reference::UNNECESSARY_MUT_PASSED),
+ LintId::of(needless_late_init::NEEDLESS_LATE_INIT),
+ LintId::of(needless_parens_on_range_literals::NEEDLESS_PARENS_ON_RANGE_LITERALS),
+ LintId::of(neg_multiply::NEG_MULTIPLY),
+ LintId::of(new_without_default::NEW_WITHOUT_DEFAULT),
+ LintId::of(non_copy_const::BORROW_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
+ LintId::of(operators::ASSIGN_OP_PATTERN),
+ LintId::of(operators::OP_REF),
+ LintId::of(operators::PTR_EQ),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(strings::TRIM_SPLIT_WHITESPACE),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(unit_types::LET_UNIT_VALUE),
+ LintId::of(unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+])
--- /dev/null
- store.register_late_pass(|| Box::new(unused_self::UnusedSelf));
+#![feature(array_windows)]
+#![feature(binary_heap_into_iter_sorted)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(drain_filter)]
+#![feature(iter_intersperse)]
+#![cfg_attr(bootstrap, feature(let_chains))]
+#![feature(let_else)]
+#![feature(lint_reasons)]
+#![feature(never_type)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![feature(stmt_expr_attributes)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_docs_in_private_items, clippy::must_use_candidate)]
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+// Disable this rustc lint for now, as it was also done in rustc
+#![allow(rustc::potential_query_instability)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_arena;
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
+extern crate rustc_data_structures;
+extern crate rustc_driver;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_pretty;
+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;
+extern crate rustc_parse_format;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+extern crate rustc_typeck;
+
+#[macro_use]
+extern crate clippy_utils;
+
+use clippy_utils::parse_msrv;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_lint::LintId;
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+
+/// Macro used to declare a Clippy lint.
+///
+/// Every lint declaration consists of 4 parts:
+///
+/// 1. The documentation, which is used for the website
+/// 2. The `LINT_NAME`. See [lint naming][lint_naming] on lint naming conventions.
+/// 3. The `lint_level`, which is a mapping from *one* of our lint groups to `Allow`, `Warn` or
+/// `Deny`. The lint level here has nothing to do with what lint groups the lint is a part of.
+/// 4. The `description` that contains a short explanation on what's wrong with code where the
+/// lint is triggered.
+///
+/// Currently the categories `style`, `correctness`, `suspicious`, `complexity` and `perf` are
+/// enabled by default. As said in the README.md of this repository, if the lint level mapping
+/// changes, please update README.md.
+///
+/// # Example
+///
+/// ```
+/// #![feature(rustc_private)]
+/// extern crate rustc_session;
+/// use rustc_session::declare_tool_lint;
+/// use clippy_lints::declare_clippy_lint;
+///
+/// declare_clippy_lint! {
+/// /// ### What it does
+/// /// Checks for ... (describe what the lint matches).
+/// ///
+/// /// ### Why is this bad?
+/// /// Supply the reason for linting the code.
+/// ///
+/// /// ### Example
+/// /// ```rust
+/// /// Insert a short example of code that triggers the lint
+/// /// ```
+/// ///
+/// /// Use instead:
+/// /// ```rust
+/// /// Insert a short example of improved code that doesn't trigger the lint
+/// /// ```
+/// pub LINT_NAME,
+/// pedantic,
+/// "description"
+/// }
+/// ```
+/// [lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
+#[macro_export]
+macro_rules! declare_clippy_lint {
+ { $(#[$attr:meta])* pub $name:tt, style, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, correctness, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Deny, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, suspicious, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, complexity, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, perf, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, pedantic, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, restriction, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, cargo, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, nursery, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal_warn, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+}
+
+#[cfg(feature = "internal")]
+pub mod deprecated_lints;
+#[cfg_attr(feature = "internal", allow(clippy::missing_clippy_version_attribute))]
+mod utils;
+
+mod renamed_lints;
+
+// begin lints modules, do not remove this comment, it’s used in `update_lints`
+mod almost_complete_letter_range;
+mod approx_const;
+mod as_conversions;
+mod as_underscore;
+mod asm_syntax;
+mod assertions_on_constants;
++mod assertions_on_result_states;
+mod async_yields_async;
+mod attrs;
+mod await_holding_invalid;
+mod blacklisted_name;
+mod blocks_in_if_conditions;
+mod bool_assert_comparison;
+mod booleans;
+mod borrow_as_ptr;
+mod borrow_deref_ref;
+mod bytecount;
+mod bytes_count_to_len;
+mod cargo;
+mod case_sensitive_file_extension_comparisons;
+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_methods;
+mod disallowed_script_idents;
+mod disallowed_types;
+mod doc;
+mod doc_link_with_quotes;
+mod double_parens;
+mod drop_forget_ref;
+mod duplicate_mod;
+mod else_if_without_else;
+mod empty_drop;
+mod empty_enum;
+mod empty_structs_with_brackets;
+mod entry;
+mod enum_clike;
+mod enum_variants;
+mod equatable_if_let;
+mod escape;
+mod eta_reduction;
+mod excessive_bools;
+mod exhaustive_items;
+mod exit;
+mod explicit_write;
+mod fallible_impl_from;
+mod float_literal;
+mod floating_point_arithmetic;
+mod format;
+mod format_args;
+mod format_impl;
+mod format_push_string;
+mod formatting;
+mod from_over_into;
+mod from_str_radix_10;
+mod functions;
+mod future_not_send;
+mod get_first;
+mod if_let_mutex;
+mod if_not_else;
+mod if_then_some_else_none;
+mod implicit_hasher;
+mod implicit_return;
+mod implicit_saturating_sub;
+mod inconsistent_struct_constructor;
+mod index_refutable_slice;
+mod indexing_slicing;
+mod infinite_iter;
+mod inherent_impl;
+mod inherent_to_string;
+mod init_numbered_fields;
+mod inline_fn_without_body;
+mod int_plus_one;
+mod invalid_upcast_comparisons;
+mod invalid_utf8_in_unchecked;
+mod items_after_statements;
+mod iter_not_returning_iterator;
+mod large_const_arrays;
+mod large_enum_variant;
+mod large_include_file;
+mod large_stack_arrays;
+mod len_zero;
+mod let_if_seq;
+mod let_underscore;
+mod lifetimes;
+mod literal_representation;
+mod loops;
+mod macro_use;
+mod main_recursion;
+mod manual_assert;
+mod manual_async_fn;
+mod manual_bits;
+mod manual_non_exhaustive;
+mod manual_ok_or;
+mod manual_rem_euclid;
+mod manual_retain;
+mod manual_strip;
+mod map_clone;
+mod map_err_ignore;
+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 mixed_read_write_in_expression;
+mod module_style;
+mod mut_key;
+mod mut_mut;
+mod mut_mutex_lock;
+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 open_options;
+mod operators;
+mod option_env_unwrap;
+mod option_if_let_else;
+mod overflow_check_conditional;
+mod panic_in_result_fn;
+mod panic_unimplemented;
+mod partialeq_ne_impl;
+mod pass_by_ref_or_value;
+mod path_buf_push_overwrite;
+mod pattern_type_mismatch;
+mod precedence;
+mod ptr;
+mod ptr_offset_with_cast;
+mod pub_use;
+mod question_mark;
+mod ranges;
+mod rc_clone_in_vec_init;
+mod read_zero_byte_vec;
+mod redundant_clone;
+mod redundant_closure_call;
+mod redundant_else;
+mod redundant_field_names;
+mod redundant_pub_crate;
+mod redundant_slicing;
+mod redundant_static_lifetimes;
+mod ref_option_ref;
+mod reference;
+mod regex;
+mod repeat_once;
+mod return_self_not_must_use;
+mod returns;
+mod same_name_method;
+mod self_named_constructors;
+mod semicolon_if_nothing_returned;
+mod serde_api;
+mod shadow;
+mod single_char_lifetime_names;
+mod single_component_path_imports;
+mod size_of_in_element_count;
+mod slow_vector_initialization;
+mod stable_sort_primitive;
+mod std_instead_of_core;
+mod strings;
+mod strlen_on_c_strings;
+mod suspicious_operation_groupings;
+mod suspicious_trait_impl;
+mod swap;
+mod swap_ptr_to_ref;
+mod tabs_in_doc_comments;
+mod temporary_assignment;
+mod to_digit_is_some;
+mod trailing_empty_array;
+mod trait_bounds;
+mod transmute;
+mod transmuting_null;
+mod types;
+mod undocumented_unsafe_blocks;
+mod unicode;
+mod uninit_vec;
+mod unit_hash;
+mod unit_return_expecting_ord;
+mod unit_types;
+mod unnamed_address;
+mod unnecessary_owned_empty_strings;
+mod unnecessary_self_imports;
+mod unnecessary_sort_by;
+mod unnecessary_wraps;
+mod unnested_or_patterns;
+mod unsafe_removed_from_name;
+mod unused_async;
+mod unused_io_amount;
+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 vec_resize_to_zero;
+mod verbose_file_reads;
+mod wildcard_imports;
+mod write;
+mod zero_div_zero;
+mod zero_sized_map_values;
+// end lints modules, do not remove this comment, it’s used in `update_lints`
+
+pub use crate::utils::conf::Conf;
+use crate::utils::conf::{format_error, TryConf};
+
+/// Register all pre expansion lints
+///
+/// Pre-expansion lints run before any macro expansion has happened.
+///
+/// Note that due to the architecture of the compiler, currently `cfg_attr` attributes on crate
+/// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass.
+///
+/// Used in `./src/driver.rs`.
+pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ // NOTE: Do not add any more pre-expansion passes. These should be removed eventually.
+
+ let msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
+ sess.err(&format!(
+ "error reading Clippy's configuration file. `{}` is not a valid Rust version",
+ s
+ ));
+ None
+ })
+ });
+
+ store.register_pre_expansion_pass(|| Box::new(write::Write::default()));
+ store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv }));
+}
+
+fn read_msrv(conf: &Conf, sess: &Session) -> Option<RustcVersion> {
+ let cargo_msrv = std::env::var("CARGO_PKG_RUST_VERSION")
+ .ok()
+ .and_then(|v| parse_msrv(&v, None, None));
+ let clippy_msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
+ sess.err(&format!(
+ "error reading Clippy's configuration file. `{}` is not a valid Rust version",
+ s
+ ));
+ None
+ })
+ });
+
+ if let Some(cargo_msrv) = cargo_msrv {
+ if let Some(clippy_msrv) = clippy_msrv {
+ // if both files have an msrv, let's compare them and emit a warning if they differ
+ if clippy_msrv != cargo_msrv {
+ sess.warn(&format!(
+ "the MSRV in `clippy.toml` and `Cargo.toml` differ; using `{}` from `clippy.toml`",
+ clippy_msrv
+ ));
+ }
+
+ Some(clippy_msrv)
+ } else {
+ Some(cargo_msrv)
+ }
+ } else {
+ clippy_msrv
+ }
+}
+
+#[doc(hidden)]
+pub fn read_conf(sess: &Session) -> Conf {
+ let file_name = match utils::conf::lookup_conf_file() {
+ Ok(Some(path)) => path,
+ Ok(None) => return Conf::default(),
+ Err(error) => {
+ sess.struct_err(&format!("error finding Clippy's configuration file: {}", error))
+ .emit();
+ return Conf::default();
+ },
+ };
+
+ let TryConf { conf, errors } = 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)
+ ));
+ }
+
+ conf
+}
+
+/// Register all lints and lint groups with the rustc plugin registry
+///
+/// Used in `./src/driver.rs`.
+#[expect(clippy::too_many_lines)]
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ register_removed_non_tool_lints(store);
+
+ include!("lib.deprecated.rs");
+
+ include!("lib.register_lints.rs");
+ include!("lib.register_restriction.rs");
+ include!("lib.register_pedantic.rs");
+
+ #[cfg(feature = "internal")]
+ include!("lib.register_internal.rs");
+
+ include!("lib.register_all.rs");
+ include!("lib.register_style.rs");
+ include!("lib.register_complexity.rs");
+ include!("lib.register_correctness.rs");
+ include!("lib.register_suspicious.rs");
+ include!("lib.register_perf.rs");
+ include!("lib.register_cargo.rs");
+ include!("lib.register_nursery.rs");
+
+ #[cfg(feature = "internal")]
+ {
+ if std::env::var("ENABLE_METADATA_COLLECTION").eq(&Ok("1".to_string())) {
+ store.register_late_pass(|| Box::new(utils::internal_lints::metadata_collector::MetadataCollector::new()));
+ return;
+ }
+ }
+
+ // all the internal lints
+ #[cfg(feature = "internal")]
+ {
+ store.register_early_pass(|| Box::new(utils::internal_lints::ClippyLintsInternal));
+ store.register_early_pass(|| Box::new(utils::internal_lints::ProduceIce));
+ store.register_late_pass(|| Box::new(utils::internal_lints::CollapsibleCalls));
+ store.register_late_pass(|| Box::new(utils::internal_lints::CompilerLintFunctions::new()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::IfChainStyle));
+ store.register_late_pass(|| Box::new(utils::internal_lints::InvalidPaths));
+ store.register_late_pass(|| Box::new(utils::internal_lints::InterningDefinedSymbol::default()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::LintWithoutLintPass::default()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::MatchTypeOnDiagItem));
+ store.register_late_pass(|| Box::new(utils::internal_lints::OuterExpnDataPass));
+ store.register_late_pass(|| Box::new(utils::internal_lints::MsrvAttrImpl));
+ }
+
++ let arithmetic_allowed = conf.arithmetic_allowed.clone();
++ store.register_late_pass(move || Box::new(operators::arithmetic::Arithmetic::new(arithmetic_allowed.clone())));
+ store.register_late_pass(|| Box::new(utils::dump_hir::DumpHir));
+ store.register_late_pass(|| Box::new(utils::author::Author));
+ let await_holding_invalid_types = conf.await_holding_invalid_types.clone();
+ store.register_late_pass(move || {
+ Box::new(await_holding_invalid::AwaitHolding::new(
+ await_holding_invalid_types.clone(),
+ ))
+ });
+ store.register_late_pass(|| Box::new(serde_api::SerdeApi));
+ let vec_box_size_threshold = conf.vec_box_size_threshold;
+ let type_complexity_threshold = conf.type_complexity_threshold;
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ store.register_late_pass(move || {
+ Box::new(types::Types::new(
+ vec_box_size_threshold,
+ type_complexity_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_late_pass(|| Box::new(booleans::NonminimalBool));
+ store.register_late_pass(|| Box::new(enum_clike::UnportableVariant));
+ store.register_late_pass(|| Box::new(float_literal::FloatLiteral));
+ store.register_late_pass(|| Box::new(ptr::Ptr));
+ store.register_late_pass(|| Box::new(needless_bool::NeedlessBool));
+ store.register_late_pass(|| Box::new(needless_bool::BoolComparison));
+ store.register_late_pass(|| Box::new(needless_for_each::NeedlessForEach));
+ store.register_late_pass(|| Box::new(misc::MiscLints));
+ store.register_late_pass(|| Box::new(eta_reduction::EtaReduction));
+ store.register_late_pass(|| Box::new(mut_mut::MutMut));
+ store.register_late_pass(|| Box::new(mut_reference::UnnecessaryMutPassed));
+ store.register_late_pass(|| Box::new(len_zero::LenZero));
+ store.register_late_pass(|| Box::new(attrs::Attributes));
+ store.register_late_pass(|| Box::new(blocks_in_if_conditions::BlocksInIfConditions));
+ store.register_late_pass(|| Box::new(unicode::Unicode));
+ store.register_late_pass(|| Box::new(uninit_vec::UninitVec));
+ store.register_late_pass(|| Box::new(unit_hash::UnitHash));
+ store.register_late_pass(|| Box::new(unit_return_expecting_ord::UnitReturnExpectingOrd));
+ store.register_late_pass(|| Box::new(strings::StringAdd));
+ store.register_late_pass(|| Box::new(implicit_return::ImplicitReturn));
+ store.register_late_pass(|| Box::new(implicit_saturating_sub::ImplicitSaturatingSub));
+ store.register_late_pass(|| Box::new(default_numeric_fallback::DefaultNumericFallback));
+ store.register_late_pass(|| Box::new(inconsistent_struct_constructor::InconsistentStructConstructor));
+ store.register_late_pass(|| Box::new(non_octal_unix_permissions::NonOctalUnixPermissions));
+ store.register_early_pass(|| Box::new(unnecessary_self_imports::UnnecessarySelfImports));
+
+ let msrv = read_msrv(conf, sess);
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ let allow_expect_in_tests = conf.allow_expect_in_tests;
+ let allow_unwrap_in_tests = conf.allow_unwrap_in_tests;
+ store.register_late_pass(move || Box::new(approx_const::ApproxConstant::new(msrv)));
+ store.register_late_pass(move || {
+ Box::new(methods::Methods::new(
+ avoid_breaking_exported_api,
+ msrv,
+ allow_expect_in_tests,
+ allow_unwrap_in_tests,
+ ))
+ });
+ store.register_late_pass(move || Box::new(matches::Matches::new(msrv)));
+ store.register_early_pass(move || Box::new(manual_non_exhaustive::ManualNonExhaustiveStruct::new(msrv)));
+ store.register_late_pass(move || Box::new(manual_non_exhaustive::ManualNonExhaustiveEnum::new(msrv)));
+ store.register_late_pass(move || Box::new(manual_strip::ManualStrip::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_static_lifetimes::RedundantStaticLifetimes::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_field_names::RedundantFieldNames::new(msrv)));
+ store.register_late_pass(move || Box::new(checked_conversions::CheckedConversions::new(msrv)));
+ store.register_late_pass(move || Box::new(mem_replace::MemReplace::new(msrv)));
+ store.register_late_pass(move || Box::new(ranges::Ranges::new(msrv)));
+ store.register_late_pass(move || Box::new(from_over_into::FromOverInto::new(msrv)));
+ store.register_late_pass(move || Box::new(use_self::UseSelf::new(msrv)));
+ store.register_late_pass(move || Box::new(missing_const_for_fn::MissingConstForFn::new(msrv)));
+ store.register_late_pass(move || Box::new(needless_question_mark::NeedlessQuestionMark));
+ store.register_late_pass(move || Box::new(casts::Casts::new(msrv)));
+ store.register_early_pass(move || Box::new(unnested_or_patterns::UnnestedOrPatterns::new(msrv)));
+ store.register_late_pass(move || Box::new(map_clone::MapClone::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::new(map_err_ignore::MapErrIgnore));
+ store.register_late_pass(|| Box::new(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::new(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(open_options::OpenOptions));
+ store.register_late_pass(|| Box::new(zero_div_zero::ZeroDiv));
+ store.register_late_pass(|| Box::new(mutex_atomic::Mutex));
+ store.register_late_pass(|| Box::new(needless_update::NeedlessUpdate));
+ store.register_late_pass(|| Box::new(needless_borrowed_ref::NeedlessBorrowedRef));
+ store.register_late_pass(|| Box::new(borrow_deref_ref::BorrowDerefRef));
+ store.register_late_pass(|| Box::new(no_effect::NoEffect));
+ store.register_late_pass(|| Box::new(temporary_assignment::TemporaryAssignment));
+ store.register_late_pass(move || Box::new(transmute::Transmute::new(msrv)));
+ let cognitive_complexity_threshold = conf.cognitive_complexity_threshold;
+ store.register_late_pass(move || {
+ Box::new(cognitive_complexity::CognitiveComplexity::new(
+ cognitive_complexity_threshold,
+ ))
+ });
+ let too_large_for_stack = conf.too_large_for_stack;
+ store.register_late_pass(move || Box::new(escape::BoxedLocal { too_large_for_stack }));
+ store.register_late_pass(move || Box::new(vec::UselessVec { too_large_for_stack }));
+ store.register_late_pass(|| Box::new(panic_unimplemented::PanicUnimplemented));
+ store.register_late_pass(|| Box::new(strings::StringLitAsBytes));
+ store.register_late_pass(|| Box::new(derive::Derive));
+ store.register_late_pass(|| Box::new(derivable_impls::DerivableImpls));
+ store.register_late_pass(|| Box::new(drop_forget_ref::DropForgetRef));
+ store.register_late_pass(|| Box::new(empty_enum::EmptyEnum));
+ store.register_late_pass(|| Box::new(invalid_upcast_comparisons::InvalidUpcastComparisons));
+ store.register_late_pass(|| Box::new(regex::Regex));
+ store.register_late_pass(|| Box::new(copies::CopyAndPaste));
+ store.register_late_pass(|| Box::new(copy_iterator::CopyIterator));
+ store.register_late_pass(|| Box::new(format::UselessFormat));
+ store.register_late_pass(|| Box::new(swap::Swap));
+ store.register_late_pass(|| Box::new(overflow_check_conditional::OverflowCheckConditional));
+ store.register_late_pass(|| Box::new(new_without_default::NewWithoutDefault::default()));
+ let blacklisted_names = conf.blacklisted_names.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move || Box::new(blacklisted_name::BlacklistedName::new(blacklisted_names.clone())));
+ let too_many_arguments_threshold = conf.too_many_arguments_threshold;
+ let too_many_lines_threshold = conf.too_many_lines_threshold;
+ store.register_late_pass(move || {
+ Box::new(functions::Functions::new(
+ too_many_arguments_threshold,
+ too_many_lines_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(bytecount::ByteCount));
+ 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::new(useless_conversion::UselessConversion::default()));
+ store.register_late_pass(|| Box::new(implicit_hasher::ImplicitHasher));
+ store.register_late_pass(|| Box::new(fallible_impl_from::FallibleImplFrom));
+ store.register_late_pass(|| Box::new(question_mark::QuestionMark));
+ store.register_early_pass(|| Box::new(suspicious_operation_groupings::SuspiciousOperationGroupings));
+ store.register_late_pass(|| Box::new(suspicious_trait_impl::SuspiciousImpl));
+ store.register_late_pass(|| Box::new(map_unit_fn::MapUnit));
+ store.register_late_pass(|| Box::new(inherent_impl::MultipleInherentImpl));
+ store.register_late_pass(|| Box::new(neg_cmp_op_on_partial_ord::NoNegCompOpForPartialOrd));
+ store.register_late_pass(|| Box::new(unwrap::Unwrap));
+ store.register_late_pass(|| Box::new(indexing_slicing::IndexingSlicing));
+ store.register_late_pass(|| Box::new(non_copy_const::NonCopyConst));
+ store.register_late_pass(|| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
+ store.register_late_pass(|| Box::new(redundant_clone::RedundantClone));
+ store.register_late_pass(|| Box::new(slow_vector_initialization::SlowVectorInit));
+ store.register_late_pass(|| Box::new(unnecessary_sort_by::UnnecessarySortBy));
+ 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(transmuting_null::TransmutingNull));
+ store.register_late_pass(|| Box::new(path_buf_push_overwrite::PathBufPushOverwrite));
+ store.register_late_pass(|| Box::new(inherent_to_string::InherentToString));
+ let max_trait_bounds = conf.max_trait_bounds;
+ store.register_late_pass(move || Box::new(trait_bounds::TraitBounds::new(max_trait_bounds)));
+ store.register_late_pass(|| Box::new(comparison_chain::ComparisonChain));
+ store.register_late_pass(|| Box::new(mut_key::MutableKeyType));
+ store.register_early_pass(|| Box::new(reference::DerefAddrOf));
+ store.register_early_pass(|| Box::new(double_parens::DoubleParens));
+ store.register_late_pass(|| Box::new(format_impl::FormatImpl::new()));
+ store.register_early_pass(|| Box::new(unsafe_removed_from_name::UnsafeNameRemoval));
+ store.register_early_pass(|| Box::new(else_if_without_else::ElseIfWithoutElse));
+ store.register_early_pass(|| Box::new(int_plus_one::IntPlusOne));
+ store.register_early_pass(|| Box::new(formatting::Formatting));
+ store.register_early_pass(|| Box::new(misc_early::MiscEarlyLints));
+ store.register_early_pass(|| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_late_pass(|| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_early_pass(|| Box::new(unused_unit::UnusedUnit));
+ store.register_late_pass(|| Box::new(returns::Return));
+ store.register_early_pass(|| Box::new(collapsible_if::CollapsibleIf));
+ store.register_early_pass(|| Box::new(items_after_statements::ItemsAfterStatements));
+ store.register_early_pass(|| Box::new(precedence::Precedence));
+ store.register_late_pass(|| Box::new(needless_parens_on_range_literals::NeedlessParensOnRangeLiterals));
+ store.register_early_pass(|| Box::new(needless_continue::NeedlessContinue));
+ store.register_early_pass(|| Box::new(redundant_else::RedundantElse));
+ store.register_late_pass(|| Box::new(create_dir::CreateDir));
+ store.register_early_pass(|| Box::new(needless_arbitrary_self_type::NeedlessArbitrarySelfType));
+ let literal_representation_lint_fraction_readability = conf.unreadable_literal_lint_fractions;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::LiteralDigitGrouping::new(
+ literal_representation_lint_fraction_readability,
+ ))
+ });
+ let literal_representation_threshold = conf.literal_representation_threshold;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::DecimalLiteralRepresentation::new(
+ literal_representation_threshold,
+ ))
+ });
+ let enum_variant_name_threshold = conf.enum_variant_name_threshold;
+ store.register_late_pass(move || {
+ Box::new(enum_variants::EnumVariantNames::new(
+ enum_variant_name_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_early_pass(|| Box::new(tabs_in_doc_comments::TabsInDocComments));
+ let upper_case_acronyms_aggressive = conf.upper_case_acronyms_aggressive;
+ store.register_late_pass(move || {
+ Box::new(upper_case_acronyms::UpperCaseAcronyms::new(
+ avoid_breaking_exported_api,
+ upper_case_acronyms_aggressive,
+ ))
+ });
+ store.register_late_pass(|| Box::new(default::Default::default()));
- store.register_late_pass(|| Box::new(std_instead_of_core::StdReexports));
++ store.register_late_pass(move || Box::new(unused_self::UnusedSelf::new(avoid_breaking_exported_api)));
+ store.register_late_pass(|| Box::new(mutable_debug_assertion::DebugAssertWithMutCall));
+ store.register_late_pass(|| Box::new(exit::Exit));
+ store.register_late_pass(|| Box::new(to_digit_is_some::ToDigitIsSome));
+ let array_size_threshold = conf.array_size_threshold;
+ store.register_late_pass(move || Box::new(large_stack_arrays::LargeStackArrays::new(array_size_threshold)));
+ store.register_late_pass(move || Box::new(large_const_arrays::LargeConstArrays::new(array_size_threshold)));
+ store.register_late_pass(|| Box::new(floating_point_arithmetic::FloatingPointArithmetic));
+ store.register_early_pass(|| Box::new(as_conversions::AsConversions));
+ store.register_late_pass(|| Box::new(let_underscore::LetUnderscore));
+ store.register_early_pass(|| Box::new(single_component_path_imports::SingleComponentPathImports));
+ let max_fn_params_bools = conf.max_fn_params_bools;
+ let max_struct_bools = conf.max_struct_bools;
+ store.register_early_pass(move || {
+ Box::new(excessive_bools::ExcessiveBools::new(
+ max_struct_bools,
+ max_fn_params_bools,
+ ))
+ });
+ store.register_early_pass(|| Box::new(option_env_unwrap::OptionEnvUnwrap));
+ let warn_on_all_wildcard_imports = conf.warn_on_all_wildcard_imports;
+ store.register_late_pass(move || Box::new(wildcard_imports::WildcardImports::new(warn_on_all_wildcard_imports)));
+ store.register_late_pass(|| Box::new(verbose_file_reads::VerboseFileReads));
+ store.register_late_pass(|| Box::new(redundant_pub_crate::RedundantPubCrate::default()));
+ store.register_late_pass(|| Box::new(unnamed_address::UnnamedAddress));
+ store.register_late_pass(|| Box::new(dereference::Dereferencing::default()));
+ 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(mut_mutex_lock::MutMutexLock));
+ store.register_late_pass(|| Box::new(manual_async_fn::ManualAsyncFn));
+ store.register_late_pass(|| Box::new(vec_resize_to_zero::VecResizeToZero));
+ 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::new(macro_use::MacroUseImports::default()));
+ store.register_late_pass(|| Box::new(pattern_type_mismatch::PatternTypeMismatch));
+ store.register_late_pass(|| Box::new(stable_sort_primitive::StableSortPrimitive));
+ store.register_late_pass(|| Box::new(repeat_once::RepeatOnce));
+ store.register_late_pass(|| Box::new(unwrap_in_result::UnwrapInResult));
+ store.register_late_pass(|| Box::new(manual_ok_or::ManualOkOr));
+ store.register_late_pass(|| Box::new(semicolon_if_nothing_returned::SemicolonIfNothingReturned));
+ store.register_late_pass(|| Box::new(async_yields_async::AsyncYieldsAsync));
+ 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::new(vec_init_then_push::VecInitThenPush::default()));
+ store.register_late_pass(|| {
+ Box::new(case_sensitive_file_extension_comparisons::CaseSensitiveFileExtensionComparisons)
+ });
+ store.register_late_pass(|| Box::new(redundant_slicing::RedundantSlicing));
+ store.register_late_pass(|| Box::new(from_str_radix_10::FromStrRadix10));
+ store.register_late_pass(move || Box::new(if_then_some_else_none::IfThenSomeElseNone::new(msrv)));
+ store.register_late_pass(|| Box::new(bool_assert_comparison::BoolAssertComparison));
+ store.register_early_pass(move || Box::new(module_style::ModStyle));
+ store.register_late_pass(|| Box::new(unused_async::UnusedAsync));
+ let disallowed_types = conf.disallowed_types.clone();
+ store.register_late_pass(move || Box::new(disallowed_types::DisallowedTypes::new(disallowed_types.clone())));
+ let import_renames = conf.enforced_import_renames.clone();
+ store.register_late_pass(move || {
+ Box::new(missing_enforced_import_rename::ImportRename::new(
+ import_renames.clone(),
+ ))
+ });
+ let scripts = conf.allowed_scripts.clone();
+ store.register_early_pass(move || Box::new(disallowed_script_idents::DisallowedScriptIdents::new(&scripts)));
+ store.register_late_pass(|| Box::new(strlen_on_c_strings::StrlenOnCStrings));
+ store.register_late_pass(move || Box::new(self_named_constructors::SelfNamedConstructors));
+ store.register_late_pass(move || Box::new(iter_not_returning_iterator::IterNotReturningIterator));
+ store.register_late_pass(move || Box::new(manual_assert::ManualAssert));
+ let enable_raw_pointer_heuristic_for_send = conf.enable_raw_pointer_heuristic_for_send;
+ store.register_late_pass(move || {
+ Box::new(non_send_fields_in_send_ty::NonSendFieldInSendTy::new(
+ enable_raw_pointer_heuristic_for_send,
+ ))
+ });
+ store.register_late_pass(move || Box::new(undocumented_unsafe_blocks::UndocumentedUnsafeBlocks));
+ store.register_late_pass(move || Box::new(format_args::FormatArgs));
+ 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(borrow_as_ptr::BorrowAsPtr::new(msrv)));
+ store.register_late_pass(move || Box::new(manual_bits::ManualBits::new(msrv)));
+ store.register_late_pass(|| Box::new(default_union_representation::DefaultUnionRepresentation));
+ store.register_early_pass(|| Box::new(doc_link_with_quotes::DocLinkWithQuotes));
+ store.register_late_pass(|| Box::new(only_used_in_recursion::OnlyUsedInRecursion));
+ let allow_dbg_in_tests = conf.allow_dbg_in_tests;
+ store.register_late_pass(move || Box::new(dbg_macro::DbgMacro::new(allow_dbg_in_tests)));
+ let cargo_ignore_publish = conf.cargo_ignore_publish;
+ store.register_late_pass(move || {
+ Box::new(cargo::Cargo {
+ ignore_publish: cargo_ignore_publish,
+ })
+ });
+ store.register_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));
+ store.register_late_pass(|| Box::new(bytes_count_to_len::BytesCountToLen));
+ 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::new(duplicate_mod::DuplicateMod::default()));
+ store.register_late_pass(|| Box::new(get_first::GetFirst));
+ store.register_early_pass(|| Box::new(unused_rounding::UnusedRounding));
+ store.register_early_pass(move || Box::new(almost_complete_letter_range::AlmostCompleteLetterRange::new(msrv)));
+ store.register_late_pass(|| Box::new(swap_ptr_to_ref::SwapPtrToRef));
+ store.register_late_pass(|| Box::new(mismatching_type_param_order::TypeParamMismatch));
+ store.register_late_pass(|| Box::new(as_underscore::AsUnderscore));
+ 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::new(std_instead_of_core::StdReexports::default()));
+ // 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
- return;
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::trait_ref_of_method;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::intravisit::nested_filter::{self as hir_nested_filter, NestedFilter};
+use rustc_hir::intravisit::{
+ walk_fn_decl, walk_generic_param, walk_generics, walk_impl_item_ref, walk_item, walk_param_bound,
+ walk_poly_trait_ref, walk_trait_ref, walk_ty, Visitor,
+};
+use rustc_hir::FnRetTy::Return;
+use rustc_hir::{
+ BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, Impl, ImplItem,
+ ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, PredicateOrigin,
+ TraitBoundModifier, TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WherePredicate,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::hir::nested_filter as middle_nested_filter;
+use rustc_middle::ty::TyCtxt;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::def_id::LocalDefId;
+use rustc_span::source_map::Span;
+use rustc_span::symbol::{kw, Ident, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for lifetime annotations which can be removed by
+ /// relying on lifetime elision.
+ ///
+ /// ### Why is this bad?
+ /// The additional lifetimes make the code look more
+ /// complicated, while there is nothing out of the ordinary going on. Removing
+ /// them leads to more readable code.
+ ///
+ /// ### Known problems
+ /// - We bail out if the function has a `where` clause where lifetimes
+ /// are mentioned due to potential false positives.
+ /// - Lifetime bounds such as `impl Foo + 'a` and `T: 'a` must be elided with the
+ /// placeholder notation `'_` because the fully elided notation leaves the type bound to `'static`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Unnecessary lifetime annotations
+ /// fn in_and_out<'a>(x: &'a u8, y: u8) -> &'a u8 {
+ /// x
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// fn elided(x: &u8, y: u8) -> &u8 {
+ /// x
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEEDLESS_LIFETIMES,
+ complexity,
+ "using explicit lifetimes for references in function arguments when elision rules \
+ would allow omitting them"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for lifetimes in generics that are never used
+ /// anywhere else.
+ ///
+ /// ### Why is this bad?
+ /// The additional lifetimes make the code look more
+ /// complicated, while there is nothing out of the ordinary going on. Removing
+ /// them leads to more readable code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // unnecessary lifetimes
+ /// fn unused_lifetime<'a>(x: u8) {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// fn no_lifetime(x: u8) {
+ /// // ...
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXTRA_UNUSED_LIFETIMES,
+ complexity,
+ "unused lifetimes in function definitions"
+}
+
+declare_lint_pass!(Lifetimes => [NEEDLESS_LIFETIMES, EXTRA_UNUSED_LIFETIMES]);
+
+impl<'tcx> LateLintPass<'tcx> for Lifetimes {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if let ItemKind::Fn(ref sig, generics, id) = item.kind {
+ check_fn_inner(cx, sig.decl, Some(id), None, generics, item.span, true);
+ } else if let ItemKind::Impl(impl_) = item.kind {
+ if !item.span.from_expansion() {
+ report_extra_impl_lifetimes(cx, impl_);
+ }
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
+ if let ImplItemKind::Fn(ref sig, id) = item.kind {
+ let report_extra_lifetimes = trait_ref_of_method(cx, item.def_id).is_none();
+ check_fn_inner(
+ cx,
+ sig.decl,
+ Some(id),
+ None,
+ item.generics,
+ item.span,
+ report_extra_lifetimes,
+ );
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if let TraitItemKind::Fn(ref sig, ref body) = item.kind {
+ let (body, trait_sig) = match *body {
+ TraitFn::Required(sig) => (None, Some(sig)),
+ TraitFn::Provided(id) => (Some(id), None),
+ };
+ check_fn_inner(cx, sig.decl, body, trait_sig, item.generics, item.span, true);
+ }
+ }
+}
+
+/// The lifetime of a &-reference.
+#[derive(PartialEq, Eq, Hash, Debug, Clone)]
+enum RefLt {
+ Unnamed,
+ Static,
+ Named(LocalDefId),
+}
+
+fn check_fn_inner<'tcx>(
+ cx: &LateContext<'tcx>,
+ decl: &'tcx FnDecl<'_>,
+ body: Option<BodyId>,
+ trait_sig: Option<&[Ident]>,
+ generics: &'tcx Generics<'_>,
+ span: Span,
+ report_extra_lifetimes: bool,
+) {
+ if span.from_expansion() || has_where_lifetimes(cx, generics) {
+ return;
+ }
+
+ let types = generics
+ .params
+ .iter()
+ .filter(|param| matches!(param.kind, GenericParamKind::Type { .. }));
+ for typ in types {
+ for pred in generics.bounds_for_param(cx.tcx.hir().local_def_id(typ.hir_id)) {
+ if pred.origin == PredicateOrigin::WhereClause {
+ // has_where_lifetimes checked that this predicate contains no lifetime.
+ continue;
+ }
+
+ for bound in pred.bounds {
+ let mut visitor = RefVisitor::new(cx);
+ walk_param_bound(&mut visitor, bound);
+ if visitor.lts.iter().any(|lt| matches!(lt, RefLt::Named(_))) {
+ return;
+ }
+ if let GenericBound::Trait(ref trait_ref, _) = *bound {
+ let params = &trait_ref
+ .trait_ref
+ .path
+ .segments
+ .last()
+ .expect("a path must have at least one segment")
+ .args;
+ if let Some(params) = *params {
+ let lifetimes = params.args.iter().filter_map(|arg| match arg {
+ GenericArg::Lifetime(lt) => Some(lt),
+ _ => None,
+ });
+ for bound in lifetimes {
+ if bound.name != LifetimeName::Static && !bound.is_elided() {
+ return;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ if could_use_elision(cx, decl, body, trait_sig, generics.params) {
+ span_lint(
+ cx,
+ NEEDLESS_LIFETIMES,
+ span.with_hi(decl.output.span().hi()),
+ "explicit lifetimes given in parameter types where they could be elided \
+ (or replaced with `'_` if needed by type declaration)",
+ );
+ }
+ if report_extra_lifetimes {
+ self::report_extra_lifetimes(cx, decl, generics);
+ }
+}
+
+// elision doesn't work for explicit self types, see rust-lang/rust#69064
+fn explicit_self_type<'tcx>(cx: &LateContext<'tcx>, func: &FnDecl<'tcx>, ident: Option<Ident>) -> bool {
+ if_chain! {
+ if let Some(ident) = ident;
+ if ident.name == kw::SelfLower;
+ if !func.implicit_self.has_implicit_self();
+
+ if let Some(self_ty) = func.inputs.first();
+ then {
+ let mut visitor = RefVisitor::new(cx);
+ visitor.visit_ty(self_ty);
+
+ !visitor.all_lts().is_empty()
+ } else {
+ false
+ }
+ }
+}
+
+fn could_use_elision<'tcx>(
+ cx: &LateContext<'tcx>,
+ func: &'tcx FnDecl<'_>,
+ body: Option<BodyId>,
+ trait_sig: Option<&[Ident]>,
+ named_generics: &'tcx [GenericParam<'_>],
+) -> bool {
+ // There are two scenarios where elision works:
+ // * no output references, all input references have different LT
+ // * output references, exactly one input reference with same LT
+ // All lifetimes must be unnamed, 'static or defined without bounds on the
+ // level of the current item.
+
+ // check named LTs
+ let allowed_lts = allowed_lts_from(cx.tcx, named_generics);
+
+ // these will collect all the lifetimes for references in arg/return types
+ let mut input_visitor = RefVisitor::new(cx);
+ let mut output_visitor = RefVisitor::new(cx);
+
+ // extract lifetimes in input argument types
+ for arg in func.inputs {
+ input_visitor.visit_ty(arg);
+ }
+ // extract lifetimes in output type
+ if let Return(ty) = func.output {
+ output_visitor.visit_ty(ty);
+ }
+ for lt in named_generics {
+ input_visitor.visit_generic_param(lt);
+ }
+
+ if input_visitor.abort() || output_visitor.abort() {
+ return false;
+ }
+
+ let input_lts = input_visitor.lts;
+ let output_lts = output_visitor.lts;
+
+ if let Some(trait_sig) = trait_sig {
+ if explicit_self_type(cx, func, trait_sig.first().copied()) {
+ return false;
+ }
+ }
+
+ if let Some(body_id) = body {
+ let body = cx.tcx.hir().body(body_id);
+
+ let first_ident = body.params.first().and_then(|param| param.pat.simple_ident());
+ if explicit_self_type(cx, func, first_ident) {
+ return false;
+ }
+
+ let mut checker = BodyLifetimeChecker {
+ lifetimes_used_in_body: false,
+ };
+ checker.visit_expr(&body.value);
+ if checker.lifetimes_used_in_body {
+ return false;
+ }
+ }
+
+ // check for lifetimes from higher scopes
+ for lt in input_lts.iter().chain(output_lts.iter()) {
+ if !allowed_lts.contains(lt) {
+ return false;
+ }
+ }
+
+ // check for higher-ranked trait bounds
+ if !input_visitor.nested_elision_site_lts.is_empty() || !output_visitor.nested_elision_site_lts.is_empty() {
+ let allowed_lts: FxHashSet<_> = allowed_lts
+ .iter()
+ .filter_map(|lt| match lt {
+ RefLt::Named(def_id) => Some(cx.tcx.item_name(def_id.to_def_id())),
+ _ => None,
+ })
+ .collect();
+ for lt in input_visitor.nested_elision_site_lts {
+ if let RefLt::Named(def_id) = lt {
+ if allowed_lts.contains(&cx.tcx.item_name(def_id.to_def_id())) {
+ return false;
+ }
+ }
+ }
+ for lt in output_visitor.nested_elision_site_lts {
+ if let RefLt::Named(def_id) = lt {
+ if allowed_lts.contains(&cx.tcx.item_name(def_id.to_def_id())) {
+ return false;
+ }
+ }
+ }
+ }
+
+ // no input lifetimes? easy case!
+ if input_lts.is_empty() {
+ false
+ } else if output_lts.is_empty() {
+ // no output lifetimes, check distinctness of input lifetimes
+
+ // only unnamed and static, ok
+ let unnamed_and_static = input_lts.iter().all(|lt| *lt == RefLt::Unnamed || *lt == RefLt::Static);
+ if unnamed_and_static {
+ return false;
+ }
+ // we have no output reference, so we only need all distinct lifetimes
+ input_lts.len() == unique_lifetimes(&input_lts)
+ } else {
+ // we have output references, so we need one input reference,
+ // and all output lifetimes must be the same
+ if unique_lifetimes(&output_lts) > 1 {
+ return false;
+ }
+ if input_lts.len() == 1 {
+ match (&input_lts[0], &output_lts[0]) {
+ (&RefLt::Named(n1), &RefLt::Named(n2)) if n1 == n2 => true,
+ (&RefLt::Named(_), &RefLt::Unnamed) => true,
+ _ => false, /* already elided, different named lifetimes
+ * or something static going on */
+ }
+ } else {
+ false
+ }
+ }
+}
+
+fn allowed_lts_from(tcx: TyCtxt<'_>, named_generics: &[GenericParam<'_>]) -> FxHashSet<RefLt> {
+ let mut allowed_lts = FxHashSet::default();
+ for par in named_generics.iter() {
+ if let GenericParamKind::Lifetime { .. } = par.kind {
+ allowed_lts.insert(RefLt::Named(tcx.hir().local_def_id(par.hir_id)));
+ }
+ }
+ allowed_lts.insert(RefLt::Unnamed);
+ allowed_lts.insert(RefLt::Static);
+ allowed_lts
+}
+
+/// Number of unique lifetimes in the given vector.
+#[must_use]
+fn unique_lifetimes(lts: &[RefLt]) -> usize {
+ lts.iter().collect::<FxHashSet<_>>().len()
+}
+
+const CLOSURE_TRAIT_BOUNDS: [LangItem; 3] = [LangItem::Fn, LangItem::FnMut, LangItem::FnOnce];
+
+/// A visitor usable for `rustc_front::visit::walk_ty()`.
+struct RefVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ lts: Vec<RefLt>,
+ nested_elision_site_lts: Vec<RefLt>,
+ unelided_trait_object_lifetime: bool,
+}
+
+impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
+ fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
+ lts: Vec::new(),
+ nested_elision_site_lts: Vec::new(),
+ unelided_trait_object_lifetime: false,
+ }
+ }
+
+ fn record(&mut self, lifetime: &Option<Lifetime>) {
+ if let Some(ref lt) = *lifetime {
+ if lt.name == LifetimeName::Static {
+ self.lts.push(RefLt::Static);
+ } else if let LifetimeName::Param(_, ParamName::Fresh) = lt.name {
+ // Fresh lifetimes generated should be ignored.
+ self.lts.push(RefLt::Unnamed);
+ } else if lt.is_elided() {
+ self.lts.push(RefLt::Unnamed);
+ } else if let LifetimeName::Param(def_id, _) = lt.name {
+ self.lts.push(RefLt::Named(def_id));
+ } else {
+ self.lts.push(RefLt::Unnamed);
+ }
+ } else {
+ self.lts.push(RefLt::Unnamed);
+ }
+ }
+
+ fn all_lts(&self) -> Vec<RefLt> {
+ self.lts
+ .iter()
+ .chain(self.nested_elision_site_lts.iter())
+ .cloned()
+ .collect::<Vec<_>>()
+ }
+
+ fn abort(&self) -> bool {
+ self.unelided_trait_object_lifetime
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for RefVisitor<'a, 'tcx> {
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ self.record(&Some(*lifetime));
+ }
+
+ fn visit_poly_trait_ref(&mut self, poly_tref: &'tcx PolyTraitRef<'tcx>, tbm: TraitBoundModifier) {
+ let trait_ref = &poly_tref.trait_ref;
+ if CLOSURE_TRAIT_BOUNDS.iter().any(|&item| {
+ self.cx
+ .tcx
+ .lang_items()
+ .require(item)
+ .map_or(false, |id| Some(id) == trait_ref.trait_def_id())
+ }) {
+ let mut sub_visitor = RefVisitor::new(self.cx);
+ sub_visitor.visit_trait_ref(trait_ref);
+ self.nested_elision_site_lts.append(&mut sub_visitor.all_lts());
+ } else {
+ walk_poly_trait_ref(self, poly_tref, tbm);
+ }
+ }
+
+ fn visit_ty(&mut self, ty: &'tcx Ty<'_>) {
+ match ty.kind {
+ TyKind::OpaqueDef(item, bounds) => {
+ let map = self.cx.tcx.hir();
+ let item = map.item(item);
+ let len = self.lts.len();
+ walk_item(self, item);
+ self.lts.truncate(len);
+ self.lts.extend(bounds.iter().filter_map(|bound| match bound {
+ GenericArg::Lifetime(l) => Some(if let LifetimeName::Param(def_id, _) = l.name {
+ RefLt::Named(def_id)
+ } else {
+ RefLt::Unnamed
+ }),
+ _ => None,
+ }));
+ },
+ TyKind::BareFn(&BareFnTy { decl, .. }) => {
+ let mut sub_visitor = RefVisitor::new(self.cx);
+ sub_visitor.visit_fn_decl(decl);
+ self.nested_elision_site_lts.append(&mut sub_visitor.all_lts());
- return;
+ },
+ TyKind::TraitObject(bounds, ref lt, _) => {
+ if !lt.is_elided() {
+ self.unelided_trait_object_lifetime = true;
+ }
+ for bound in bounds {
+ self.visit_poly_trait_ref(bound, TraitBoundModifier::None);
+ }
+ },
+ _ => walk_ty(self, ty),
+ }
+ }
+}
+
+/// Are any lifetimes mentioned in the `where` clause? If so, we don't try to
+/// reason about elision.
+fn has_where_lifetimes<'tcx>(cx: &LateContext<'tcx>, generics: &'tcx Generics<'_>) -> bool {
+ for predicate in generics.predicates {
+ match *predicate {
+ WherePredicate::RegionPredicate(..) => return true,
+ WherePredicate::BoundPredicate(ref pred) => {
+ // a predicate like F: Trait or F: for<'a> Trait<'a>
+ let mut visitor = RefVisitor::new(cx);
+ // walk the type F, it may not contain LT refs
+ walk_ty(&mut visitor, pred.bounded_ty);
+ if !visitor.all_lts().is_empty() {
+ return true;
+ }
+ // if the bounds define new lifetimes, they are fine to occur
+ let allowed_lts = allowed_lts_from(cx.tcx, pred.bound_generic_params);
+ // now walk the bounds
+ for bound in pred.bounds.iter() {
+ walk_param_bound(&mut visitor, bound);
+ }
+ // and check that all lifetimes are allowed
+ if visitor.all_lts().iter().any(|it| !allowed_lts.contains(it)) {
+ return true;
+ }
+ },
+ WherePredicate::EqPredicate(ref pred) => {
+ let mut visitor = RefVisitor::new(cx);
+ walk_ty(&mut visitor, pred.lhs_ty);
+ walk_ty(&mut visitor, pred.rhs_ty);
+ if !visitor.lts.is_empty() {
+ return true;
+ }
+ },
+ }
+ }
+ false
+}
+
+struct LifetimeChecker<'cx, 'tcx, F> {
+ cx: &'cx LateContext<'tcx>,
+ map: FxHashMap<Symbol, Span>,
+ phantom: std::marker::PhantomData<F>,
+}
+
+impl<'cx, 'tcx, F> LifetimeChecker<'cx, 'tcx, F> {
+ fn new(cx: &'cx LateContext<'tcx>, map: FxHashMap<Symbol, Span>) -> LifetimeChecker<'cx, 'tcx, F> {
+ Self {
+ cx,
+ map,
+ phantom: std::marker::PhantomData,
+ }
+ }
+}
+
+impl<'cx, 'tcx, F> Visitor<'tcx> for LifetimeChecker<'cx, 'tcx, F>
+where
+ F: NestedFilter<'tcx>,
+{
+ type Map = rustc_middle::hir::map::Map<'tcx>;
+ type NestedFilter = F;
+
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ self.map.remove(&lifetime.name.ident().name);
+ }
+
+ fn visit_generic_param(&mut self, param: &'tcx GenericParam<'_>) {
+ // don't actually visit `<'a>` or `<'a: 'b>`
+ // we've already visited the `'a` declarations and
+ // don't want to spuriously remove them
+ // `'b` in `'a: 'b` is useless unless used elsewhere in
+ // a non-lifetime bound
+ if let GenericParamKind::Type { .. } = param.kind {
+ walk_generic_param(self, param);
+ }
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
+
+fn report_extra_lifetimes<'tcx>(cx: &LateContext<'tcx>, func: &'tcx FnDecl<'_>, generics: &'tcx Generics<'_>) {
+ let hs = generics
+ .params
+ .iter()
+ .filter_map(|par| match par.kind {
+ GenericParamKind::Lifetime { .. } => Some((par.name.ident().name, par.span)),
+ _ => None,
+ })
+ .collect();
+ let mut checker = LifetimeChecker::<hir_nested_filter::None>::new(cx, hs);
+
+ walk_generics(&mut checker, generics);
+ walk_fn_decl(&mut checker, func);
+
+ for &v in checker.map.values() {
+ span_lint(
+ cx,
+ EXTRA_UNUSED_LIFETIMES,
+ v,
+ "this lifetime isn't used in the function definition",
+ );
+ }
+}
+
+fn report_extra_impl_lifetimes<'tcx>(cx: &LateContext<'tcx>, impl_: &'tcx Impl<'_>) {
+ let hs = impl_
+ .generics
+ .params
+ .iter()
+ .filter_map(|par| match par.kind {
+ GenericParamKind::Lifetime { .. } => Some((par.name.ident().name, par.span)),
+ _ => None,
+ })
+ .collect();
+ let mut checker = LifetimeChecker::<middle_nested_filter::All>::new(cx, hs);
+
+ walk_generics(&mut checker, impl_.generics);
+ if let Some(ref trait_ref) = impl_.of_trait {
+ walk_trait_ref(&mut checker, trait_ref);
+ }
+ walk_ty(&mut checker, impl_.self_ty);
+ for item in impl_.items {
+ walk_impl_item_ref(&mut checker, item);
+ }
+
+ for &v in checker.map.values() {
+ span_lint(cx, EXTRA_UNUSED_LIFETIMES, v, "this lifetime isn't used in the impl");
+ }
+}
+
+struct BodyLifetimeChecker {
+ lifetimes_used_in_body: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for BodyLifetimeChecker {
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ if lifetime.name.ident().name != kw::UnderscoreLifetime && lifetime.name.ident().name != kw::StaticLifetime {
+ self.lifetimes_used_in_body = true;
+ }
+ }
+}
--- /dev/null
- use clippy_utils::source::{snippet_opt, span_starts_with, walk_span_to_context};
- use clippy_utils::{higher, in_constant, meets_msrv, msrvs};
- use rustc_hir::{Arm, Expr, ExprKind, Local, MatchSource, Pat};
- use rustc_lexer::{tokenize, TokenKind};
- use rustc_lint::{LateContext, LateLintPass, LintContext};
- use rustc_middle::lint::in_external_macro;
- use rustc_semver::RustcVersion;
- use rustc_session::{declare_tool_lint, impl_lint_pass};
- use rustc_span::{Span, SpanData, SyntaxContext};
-
+mod collapsible_match;
+mod infallible_destructuring_match;
+mod manual_map;
+mod manual_unwrap_or;
+mod match_as_ref;
+mod match_bool;
+mod match_like_matches;
+mod match_on_vec_items;
+mod match_ref_pats;
+mod match_same_arms;
+mod match_single_binding;
+mod match_str_case_mismatch;
+mod match_wild_enum;
+mod match_wild_err_arm;
+mod needless_match;
+mod overlapping_arms;
+mod redundant_pattern_match;
+mod rest_pat_in_fully_bound_struct;
+mod significant_drop_in_scrutinee;
+mod single_match;
+mod try_err;
+mod wild_in_or_pats;
+
++use clippy_utils::source::{snippet_opt, span_starts_with, walk_span_to_context};
++use clippy_utils::{higher, in_constant, meets_msrv, msrvs};
++use rustc_hir::{Arm, Expr, ExprKind, Local, MatchSource, Pat};
++use rustc_lexer::{tokenize, TokenKind};
++use rustc_lint::{LateContext, LateLintPass, LintContext};
++use rustc_middle::lint::in_external_macro;
++use rustc_semver::RustcVersion;
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::{Span, SpanData, SyntaxContext};
++
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with a single arm where an `if let`
+ /// will usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => (),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH,
+ style,
+ "a `match` statement with a single nontrivial arm (i.e., where the other arm is `_ => {}`) instead of `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with two arms where an `if let else` will
+ /// usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Known problems
+ /// Personal style preferences may differ.
+ ///
+ /// ### Example
+ /// Using `match`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => bar(&other_ref),
+ /// }
+ /// ```
+ ///
+ /// Using `if let` with `else`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// } else {
+ /// bar(&other_ref);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH_ELSE,
+ pedantic,
+ "a `match` statement with two arms where the second arm's pattern is a placeholder instead of a specific match pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where all arms match a reference,
+ /// suggesting to remove the reference and deref the matched expression
+ /// instead. It also checks for `if let &foo = bar` blocks.
+ ///
+ /// ### Why is this bad?
+ /// It just makes the code less readable. That reference
+ /// destructuring adds nothing to the code.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match x {
+ /// &A(ref y) => foo(y),
+ /// &B => bar(),
+ /// _ => frob(&x),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// match *x {
+ /// A(ref y) => foo(y),
+ /// B => bar(),
+ /// _ => frob(x),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_REF_PATS,
+ style,
+ "a `match` or `if let` with all arms prefixed with `&` instead of deref-ing the match expression"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where match expression is a `bool`. It
+ /// suggests to replace the expression with an `if...else` block.
+ ///
+ /// ### Why is this bad?
+ /// It makes the code less readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// match condition {
+ /// true => foo(),
+ /// false => bar(),
+ /// }
+ /// ```
+ /// Use if/else instead:
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// if condition {
+ /// foo();
+ /// } else {
+ /// bar();
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_BOOL,
+ pedantic,
+ "a `match` on a boolean expression instead of an `if..else` block"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for overlapping match arms.
+ ///
+ /// ### Why is this bad?
+ /// It is likely to be an error and if not, makes the code
+ /// less obvious.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 5;
+ /// match x {
+ /// 1..=10 => println!("1 ... 10"),
+ /// 5..=15 => println!("5 ... 15"),
+ /// _ => (),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_OVERLAPPING_ARM,
+ style,
+ "a `match` with overlapping arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arm which matches all errors with `Err(_)`
+ /// and take drastic actions like `panic!`.
+ ///
+ /// ### Why is this bad?
+ /// It is generally a bad practice, similar to
+ /// catching all exceptions in java with `catch(Exception)`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Result<i32, &str> = Ok(3);
+ /// match x {
+ /// Ok(_) => println!("ok"),
+ /// Err(_) => panic!("err"),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_WILD_ERR_ARM,
+ pedantic,
+ "a `match` with `Err(_)` arm and take drastic actions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for match which is used to add a reference to an
+ /// `Option` value.
+ ///
+ /// ### Why is this bad?
+ /// Using `as_ref()` or `as_mut()` instead is shorter.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = match x {
+ /// None => None,
+ /// Some(ref v) => Some(v),
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = x.as_ref();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_AS_REF,
+ complexity,
+ "a `match` on an Option value instead of using `as_ref()` or `as_mut`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches using `_`.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect if guards exhaustively cover some
+ /// variants, and also may not use correct path to enum if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// Foo::B(_) => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub WILDCARD_ENUM_MATCH_ARM,
+ restriction,
+ "a wildcard enum match arm using `_`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches for a single variant.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may not use correct path to enum
+ /// if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// Foo::C => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ pedantic,
+ "a wildcard enum match for a single variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard pattern used with others patterns in same match arm.
+ ///
+ /// ### Why is this bad?
+ /// Wildcard pattern already covers any other pattern as it will match anyway.
+ /// It makes the code less readable, especially to spot wildcard pattern use in match arm.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// "bar" | _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub WILDCARD_IN_OR_PATTERNS,
+ complexity,
+ "a wildcard pattern used with others patterns in same match arm"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches being used to destructure a single-variant enum
+ /// or tuple struct where a `let` will suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `let` doesn't nest, whereas a `match` does.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ ///
+ /// let data = match wrapper {
+ /// Wrapper::Data(i) => i,
+ /// };
+ /// ```
+ ///
+ /// The correct use would be:
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ /// let Wrapper::Data(data) = wrapper;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INFALLIBLE_DESTRUCTURING_MATCH,
+ style,
+ "a `match` statement with a single infallible arm instead of a `let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for useless match that binds to only one value.
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect when `match`
+ /// is actually binding temporary value, bringing a 'dropped while borrowed' error.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// match (a, b) {
+ /// (c, d) => {
+ /// // useless match
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// let (c, d) = (a, b);
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub MATCH_SINGLE_BINDING,
+ complexity,
+ "a match with a single binding instead of using `let` statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary '..' pattern binding on struct when all fields are explicitly matched.
+ ///
+ /// ### Why is this bad?
+ /// Correctness and readability. It's like having a wildcard pattern after
+ /// matching all enum variants explicitly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// let a = A { a: 5 };
+ ///
+ /// match a {
+ /// A { a: 5, .. } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// # let a = A { a: 5 };
+ /// match a {
+ /// A { a: 5 } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ restriction,
+ "a match on a struct that binds all fields but still uses the wildcard pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lint for redundant pattern matching over `Result`, `Option`,
+ /// `std::task::Poll` or `std::net::IpAddr`
+ ///
+ /// ### Why is this bad?
+ /// It's more concise and clear to just use the proper
+ /// utility function
+ ///
+ /// ### Known problems
+ /// This will change the drop order for the matched type. Both `if let` and
+ /// `while let` will drop the value at the end of the block, both `if` and `while` will drop the
+ /// value before entering the block. For most types this change will not matter, but for a few
+ /// types this will not be an acceptable change (e.g. locks). See the
+ /// [reference](https://doc.rust-lang.org/reference/destructors.html#drop-scopes) for more about
+ /// drop order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if let Ok(_) = Ok::<i32, i32>(42) {}
+ /// if let Err(_) = Err::<i32, i32>(42) {}
+ /// if let None = None::<()> {}
+ /// if let Some(_) = Some(42) {}
+ /// if let Poll::Pending = Poll::Pending::<()> {}
+ /// if let Poll::Ready(_) = Poll::Ready(42) {}
+ /// if let IpAddr::V4(_) = IpAddr::V4(Ipv4Addr::LOCALHOST) {}
+ /// if let IpAddr::V6(_) = IpAddr::V6(Ipv6Addr::LOCALHOST) {}
+ /// match Ok::<i32, i32>(42) {
+ /// Ok(_) => true,
+ /// Err(_) => false,
+ /// };
+ /// ```
+ ///
+ /// The more idiomatic use would be:
+ ///
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if Ok::<i32, i32>(42).is_ok() {}
+ /// if Err::<i32, i32>(42).is_err() {}
+ /// if None::<()>.is_none() {}
+ /// if Some(42).is_some() {}
+ /// if Poll::Pending::<()>.is_pending() {}
+ /// if Poll::Ready(42).is_ready() {}
+ /// if IpAddr::V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
+ /// if IpAddr::V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
+ /// Ok::<i32, i32>(42).is_ok();
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub REDUNDANT_PATTERN_MATCHING,
+ style,
+ "use the proper utility function avoiding an `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` or `if let` expressions producing a
+ /// `bool` that could be written using `matches!`
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// This lint falsely triggers, if there are arms with
+ /// `cfg` attributes that remove an arm evaluating to `false`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(5);
+ ///
+ /// let a = match x {
+ /// Some(0) => true,
+ /// _ => false,
+ /// };
+ ///
+ /// let a = if let Some(0) = x {
+ /// true
+ /// } else {
+ /// false
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = Some(5);
+ /// let a = matches!(x, Some(0));
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MATCH_LIKE_MATCHES_MACRO,
+ style,
+ "a match that could be written with the matches! macro"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` with identical arm bodies.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error. If arm bodies
+ /// are the same on purpose, you can factor them
+ /// [using `|`](https://doc.rust-lang.org/book/patterns.html#multiple-patterns).
+ ///
+ /// ### Known problems
+ /// False positive possible with order dependent `match`
+ /// (see issue
+ /// [#860](https://github.com/rust-lang/rust-clippy/issues/860)).
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => bar(), // <= oops
+ /// }
+ /// ```
+ ///
+ /// This should probably be
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => baz(), // <= fixed
+ /// }
+ /// ```
+ ///
+ /// or if the original code was not a typo:
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar | Baz => bar(), // <= shows the intent better
+ /// Quz => quz(),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_SAME_ARMS,
+ pedantic,
+ "`match` with identical arm bodies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary `match` or match-like `if let` returns for `Option` and `Result`
+ /// when function signatures are the same.
+ ///
+ /// ### Why is this bad?
+ /// This `match` block does nothing and might not be what the coder intended.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// match result {
+ /// Ok(val) => Ok(val),
+ /// Err(err) => Err(err),
+ /// }
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// if let Some(val) = option {
+ /// Some(val)
+ /// } else {
+ /// None
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Could be replaced as
+ ///
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// result
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// option
+ /// }
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub NEEDLESS_MATCH,
+ complexity,
+ "`match` or match-like `if let` that are unnecessary"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds nested `match` or `if let` expressions where the patterns may be "collapsed" together
+ /// without adding any branches.
+ ///
+ /// Note that this lint is not intended to find _all_ cases where nested match patterns can be merged, but only
+ /// cases where merging would most likely make the code more readable.
+ ///
+ /// ### Why is this bad?
+ /// It is unnecessarily verbose and complex.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(n) => match n {
+ /// Ok(n) => n,
+ /// _ => return,
+ /// }
+ /// None => return,
+ /// };
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(Ok(n)) => n,
+ /// _ => return,
+ /// };
+ /// }
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub COLLAPSIBLE_MATCH,
+ style,
+ "Nested `match` or `if let` expressions where the patterns may be \"collapsed\" together."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds patterns that reimplement `Option::unwrap_or` or `Result::unwrap_or`.
+ ///
+ /// ### Why is this bad?
+ /// Concise code helps focusing on behavior instead of boilerplate.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// match foo {
+ /// Some(v) => v,
+ /// None => 1,
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.unwrap_or(1);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_UNWRAP_OR,
+ complexity,
+ "finds patterns that can be encoded more concisely with `Option::unwrap_or` or `Result::unwrap_or`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match vec[idx]` or `match vec[n..m]`.
+ ///
+ /// ### Why is this bad?
+ /// This can panic at runtime.
+ ///
+ /// ### Example
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr[idx] {
+ /// 0 => println!("{}", 0),
+ /// 1 => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr.get(idx) {
+ /// Some(0) => println!("{}", 0),
+ /// Some(1) => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_ON_VEC_ITEMS,
+ pedantic,
+ "matching on vector elements can panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` expressions modifying the case of a string with non-compliant arms
+ ///
+ /// ### Why is this bad?
+ /// The arm is unreachable, which is likely a mistake
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "Bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub MATCH_STR_CASE_MISMATCH,
+ correctness,
+ "creation of a case altering match expression with non-compliant arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check for temporaries returned from function calls in a match scrutinee that have the
+ /// `clippy::has_significant_drop` attribute.
+ ///
+ /// ### Why is this bad?
+ /// The `clippy::has_significant_drop` attribute can be added to types whose Drop impls have
+ /// an important side-effect, such as unlocking a mutex, making it important for users to be
+ /// able to accurately understand their lifetimes. When a temporary is returned in a function
+ /// call in a match scrutinee, its lifetime lasts until the end of the match block, which may
+ /// be surprising.
+ ///
+ /// For `Mutex`es this can lead to a deadlock. This happens when the match scrutinee uses a
+ /// function call that returns a `MutexGuard` and then tries to lock again in one of the match
+ /// arms. In that case the `MutexGuard` in the scrutinee will not be dropped until the end of
+ /// the match block and thus will not unlock.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// # use std::sync::Mutex;
- ///
+ /// # struct State {}
- ///
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
- ///
+ /// # fn bar(&self) {}
+ /// # }
- ///
- ///
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// match mutex.lock().unwrap().foo() {
+ /// true => {
+ /// mutex.lock().unwrap().bar(); // Deadlock!
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
- ///
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::Mutex;
- ///
+ /// # struct State {}
- ///
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
- ///
+ /// # fn bar(&self) {}
+ /// # }
- ///
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// let is_foo = mutex.lock().unwrap().foo();
+ /// match is_foo {
+ /// true => {
+ /// mutex.lock().unwrap().bar();
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub SIGNIFICANT_DROP_IN_SCRUTINEE,
+ suspicious,
+ "warns when a temporary of a type with a drop with a significant side-effect might have a surprising lifetime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Err(x)?`.
+ ///
+ /// ### Why is this bad?
+ /// The `?` operator is designed to allow calls that
+ /// can fail to be easily chained. For example, `foo()?.bar()` or
+ /// `foo(bar()?)`. Because `Err(x)?` can't be used that way (it will
+ /// always return), it is more clear to write `return Err(x)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// Err("failed")?;
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ /// Could be written:
+ ///
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// return Err("failed".into());
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ #[clippy::version = "1.38.0"]
+ pub TRY_ERR,
+ restriction,
+ "return errors explicitly rather than hiding them behind a `?`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `match` which could be implemented using `map`
+ ///
+ /// ### Why is this bad?
+ /// Using the `map` method is clearer and more concise.
+ ///
+ /// ### Example
+ /// ```rust
+ /// match Some(0) {
+ /// Some(x) => Some(x + 1),
+ /// None => None,
+ /// };
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// Some(0).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub MANUAL_MAP,
+ style,
+ "reimplementation of `map`"
+}
+
+#[derive(Default)]
+pub struct Matches {
+ msrv: Option<RustcVersion>,
+ infallible_destructuring_match_linted: bool,
+}
+
+impl Matches {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self {
+ msrv,
+ ..Matches::default()
+ }
+ }
+}
+
+impl_lint_pass!(Matches => [
+ SINGLE_MATCH,
+ MATCH_REF_PATS,
+ MATCH_BOOL,
+ SINGLE_MATCH_ELSE,
+ MATCH_OVERLAPPING_ARM,
+ MATCH_WILD_ERR_ARM,
+ MATCH_AS_REF,
+ WILDCARD_ENUM_MATCH_ARM,
+ MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ WILDCARD_IN_OR_PATTERNS,
+ MATCH_SINGLE_BINDING,
+ INFALLIBLE_DESTRUCTURING_MATCH,
+ REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ REDUNDANT_PATTERN_MATCHING,
+ MATCH_LIKE_MATCHES_MACRO,
+ MATCH_SAME_ARMS,
+ NEEDLESS_MATCH,
+ COLLAPSIBLE_MATCH,
+ MANUAL_UNWRAP_OR,
+ MATCH_ON_VEC_ITEMS,
+ MATCH_STR_CASE_MISMATCH,
+ SIGNIFICANT_DROP_IN_SCRUTINEE,
+ TRY_ERR,
+ MANUAL_MAP,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Matches {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if in_external_macro(cx.sess(), expr.span) {
+ return;
+ }
+ let from_expansion = expr.span.from_expansion();
+
+ if let ExprKind::Match(ex, arms, source) = expr.kind {
+ if source == MatchSource::Normal && !span_starts_with(cx, expr.span, "match") {
+ return;
+ }
+ if matches!(source, MatchSource::Normal | MatchSource::ForLoopDesugar) {
+ significant_drop_in_scrutinee::check(cx, expr, ex, arms, source);
+ }
+
+ collapsible_match::check_match(cx, arms);
+ if !from_expansion {
+ // These don't depend on a relationship between multiple arms
+ match_wild_err_arm::check(cx, ex, arms);
+ wild_in_or_pats::check(cx, arms);
+ }
+
+ if source == MatchSource::TryDesugar {
+ try_err::check(cx, expr, ex);
+ }
+
+ if !from_expansion && !contains_cfg_arm(cx, expr, ex, arms) {
+ if source == MatchSource::Normal {
+ if !(meets_msrv(self.msrv, msrvs::MATCHES_MACRO)
+ && match_like_matches::check_match(cx, expr, ex, arms))
+ {
+ match_same_arms::check(cx, arms);
+ }
+
+ redundant_pattern_match::check_match(cx, expr, ex, arms);
+ single_match::check(cx, ex, arms, expr);
+ match_bool::check(cx, ex, arms, expr);
+ overlapping_arms::check(cx, ex, arms);
+ match_wild_enum::check(cx, ex, arms);
+ match_as_ref::check(cx, ex, arms, expr);
+ needless_match::check_match(cx, ex, arms, expr);
+ match_on_vec_items::check(cx, ex);
+ match_str_case_mismatch::check(cx, ex, arms);
+
+ if !in_constant(cx, expr.hir_id) {
+ manual_unwrap_or::check(cx, expr, ex, arms);
+ manual_map::check_match(cx, expr, ex, arms);
+ }
+
+ if self.infallible_destructuring_match_linted {
+ self.infallible_destructuring_match_linted = false;
+ } else {
+ match_single_binding::check(cx, ex, arms, expr);
+ }
+ }
+ match_ref_pats::check(cx, ex, arms.iter().map(|el| el.pat), expr);
+ }
+ } else if let Some(if_let) = higher::IfLet::hir(cx, expr) {
+ collapsible_match::check_if_let(cx, if_let.let_pat, if_let.if_then, if_let.if_else);
+ if !from_expansion {
+ if let Some(else_expr) = if_let.if_else {
+ if meets_msrv(self.msrv, msrvs::MATCHES_MACRO) {
+ match_like_matches::check_if_let(
+ cx,
+ expr,
+ if_let.let_pat,
+ if_let.let_expr,
+ if_let.if_then,
+ else_expr,
+ );
+ }
+ if !in_constant(cx, expr.hir_id) {
+ manual_map::check_if_let(cx, expr, if_let.let_pat, if_let.let_expr, if_let.if_then, else_expr);
+ }
+ }
+ redundant_pattern_match::check_if_let(
+ cx,
+ expr,
+ if_let.let_pat,
+ if_let.let_expr,
+ if_let.if_else.is_some(),
+ );
+ needless_match::check_if_let(cx, expr, &if_let);
+ }
+ } else if !from_expansion {
+ redundant_pattern_match::check(cx, expr);
+ }
+ }
+
+ fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx Local<'_>) {
+ self.infallible_destructuring_match_linted |=
+ local.els.is_none() && infallible_destructuring_match::check(cx, local);
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ rest_pat_in_fully_bound_struct::check(cx, pat);
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+/// Checks if there are any arms with a `#[cfg(..)]` attribute.
+fn contains_cfg_arm(cx: &LateContext<'_>, e: &Expr<'_>, scrutinee: &Expr<'_>, arms: &[Arm<'_>]) -> bool {
+ let Some(scrutinee_span) = walk_span_to_context(scrutinee.span, SyntaxContext::root()) else {
+ // Shouldn't happen, but treat this as though a `cfg` attribute were found
+ return true;
+ };
+
+ let start = scrutinee_span.hi();
+ let mut arm_spans = arms.iter().map(|arm| {
+ let data = arm.span.data();
+ (data.ctxt == SyntaxContext::root()).then_some((data.lo, data.hi))
+ });
+ let end = e.span.hi();
+
+ // Walk through all the non-code space before each match arm. The space trailing the final arm is
+ // handled after the `try_fold` e.g.
+ //
+ // match foo {
+ // _________^- everything between the scrutinee and arm1
+ //| arm1 => (),
+ //|---^___________^ everything before arm2
+ //| #[cfg(feature = "enabled")]
+ //| arm2 => some_code(),
+ //|---^____________________^ everything before arm3
+ //| // some comment about arm3
+ //| arm3 => some_code(),
+ //|---^____________________^ everything after arm3
+ //| #[cfg(feature = "disabled")]
+ //| arm4 = some_code(),
+ //|};
+ //|^
+ let found = arm_spans.try_fold(start, |start, range| {
+ let Some((end, next_start)) = range else {
+ // Shouldn't happen as macros can't expand to match arms, but treat this as though a `cfg` attribute were
+ // found.
+ return Err(());
+ };
+ let span = SpanData {
+ lo: start,
+ hi: end,
+ ctxt: SyntaxContext::root(),
+ parent: None,
+ }
+ .span();
+ (!span_contains_cfg(cx, span)).then_some(next_start).ok_or(())
+ });
+ match found {
+ Ok(start) => {
+ let span = SpanData {
+ lo: start,
+ hi: end,
+ ctxt: SyntaxContext::root(),
+ parent: None,
+ }
+ .span();
+ span_contains_cfg(cx, span)
+ },
+ Err(()) => true,
+ }
+}
+
+/// Checks if the given span contains a `#[cfg(..)]` attribute
+fn span_contains_cfg(cx: &LateContext<'_>, s: Span) -> bool {
+ let Some(snip) = snippet_opt(cx, s) else {
+ // Assume true. This would require either an invalid span, or one which crosses file boundaries.
+ return true;
+ };
+ let mut pos = 0usize;
+ let mut iter = tokenize(&snip).map(|t| {
+ let start = pos;
+ pos += t.len;
+ (t.kind, start..pos)
+ });
+
+ // Search for the token sequence [`#`, `[`, `cfg`]
+ while iter.any(|(t, _)| matches!(t, TokenKind::Pound)) {
+ let mut iter = iter.by_ref().skip_while(|(t, _)| {
+ matches!(
+ t,
+ TokenKind::Whitespace | TokenKind::LineComment { .. } | TokenKind::BlockComment { .. }
+ )
+ });
+ if matches!(iter.next(), Some((TokenKind::OpenBracket, _)))
+ && matches!(iter.next(), Some((TokenKind::Ident, range)) if &snip[range.clone()] == "cfg")
+ {
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
- if args.len() == 1 && method_name == sym!(to_string);
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::{is_type_diagnostic_item, walk_ptrs_ty_depth};
+use clippy_utils::{match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::{sym, Symbol};
+
+use super::INEFFICIENT_TO_STRING;
+
+/// Checks for the `INEFFICIENT_TO_STRING` lint
+pub fn check<'tcx>(cx: &LateContext<'tcx>, expr: &hir::Expr<'_>, method_name: Symbol, args: &[hir::Expr<'_>]) {
+ if_chain! {
++ if args.len() == 1 && method_name == sym::to_string;
+ if let Some(to_string_meth_did) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
+ if match_def_path(cx, to_string_meth_did, &paths::TO_STRING_METHOD);
+ if let Some(substs) = cx.typeck_results().node_substs_opt(expr.hir_id);
+ let arg_ty = cx.typeck_results().expr_ty_adjusted(&args[0]);
+ let self_ty = substs.type_at(0);
+ let (deref_self_ty, deref_count) = walk_ptrs_ty_depth(self_ty);
+ if deref_count >= 1;
+ if specializes_tostring(cx, deref_self_ty);
+ then {
+ span_lint_and_then(
+ cx,
+ INEFFICIENT_TO_STRING,
+ expr.span,
+ &format!("calling `to_string` on `{}`", arg_ty),
+ |diag| {
+ diag.help(&format!(
+ "`{}` implements `ToString` through a slower blanket impl, but `{}` has a fast specialization of `ToString`",
+ self_ty, deref_self_ty
+ ));
+ let mut applicability = Applicability::MachineApplicable;
+ let arg_snippet = snippet_with_applicability(cx, args[0].span, "..", &mut applicability);
+ diag.span_suggestion(
+ expr.span,
+ "try dereferencing the receiver",
+ format!("({}{}).to_string()", "*".repeat(deref_count), arg_snippet),
+ applicability,
+ );
+ },
+ );
+ }
+ }
+}
+
+/// Returns whether `ty` specializes `ToString`.
+/// Currently, these are `str`, `String`, and `Cow<'_, str>`.
+fn specializes_tostring(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ if let ty::Str = ty.kind() {
+ return true;
+ }
+
+ if is_type_diagnostic_item(cx, ty, sym::String) {
+ return true;
+ }
+
+ if let ty::Adt(adt, substs) = ty.kind() {
+ match_def_path(cx, adt.did(), &paths::COW) && substs.type_at(1).is_str()
+ } else {
+ false
+ }
+}
--- /dev/null
+mod bind_instead_of_map;
+mod bytes_nth;
+mod chars_cmp;
+mod chars_cmp_with_unwrap;
+mod chars_last_cmp;
+mod chars_last_cmp_with_unwrap;
+mod chars_next_cmp;
+mod chars_next_cmp_with_unwrap;
+mod clone_on_copy;
+mod clone_on_ref_ptr;
+mod cloned_instead_of_copied;
+mod err_expect;
+mod expect_fun_call;
+mod expect_used;
+mod extend_with_drain;
+mod filetype_is_file;
+mod filter_map;
+mod filter_map_identity;
+mod filter_map_next;
+mod filter_next;
+mod flat_map_identity;
+mod flat_map_option;
+mod from_iter_instead_of_collect;
+mod get_last_with_len;
+mod get_unwrap;
+mod implicit_clone;
+mod inefficient_to_string;
+mod inspect_for_each;
+mod into_iter_on_ref;
+mod is_digit_ascii_radix;
+mod iter_cloned_collect;
+mod iter_count;
+mod iter_next_slice;
+mod iter_nth;
+mod iter_nth_zero;
+mod iter_overeager_cloned;
+mod iter_skip_next;
+mod iter_with_drain;
+mod iterator_step_by_zero;
+mod manual_saturating_arithmetic;
+mod manual_str_repeat;
+mod map_collect_result_unit;
+mod map_flatten;
+mod map_identity;
+mod map_unwrap_or;
+mod needless_option_as_deref;
+mod needless_option_take;
+mod no_effect_replace;
++mod obfuscated_if_else;
+mod ok_expect;
+mod option_as_ref_deref;
+mod option_map_or_none;
+mod option_map_unwrap_or;
+mod or_fun_call;
+mod or_then_unwrap;
+mod search_is_some;
+mod single_char_add_str;
+mod single_char_insert_string;
+mod single_char_pattern;
+mod single_char_push_string;
+mod skip_while_next;
+mod str_splitn;
+mod string_extend_chars;
+mod suspicious_map;
+mod suspicious_splitn;
+mod uninit_assumed_init;
+mod unnecessary_filter_map;
+mod unnecessary_fold;
+mod unnecessary_iter_cloned;
+mod unnecessary_join;
+mod unnecessary_lazy_eval;
+mod unnecessary_to_owned;
+mod unwrap_or_else_default;
+mod unwrap_used;
+mod useless_asref;
+mod utils;
+mod wrong_self_convention;
+mod zst_offset;
+
+use bind_instead_of_map::BindInsteadOfMap;
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::ty::{contains_adt_constructor, contains_ty, implements_trait, is_copy, is_type_diagnostic_item};
+use clippy_utils::{contains_return, get_trait_def_id, iter_input_pats, meets_msrv, msrvs, paths, return_ty};
+use if_chain::if_chain;
+use rustc_hir as hir;
+use rustc_hir::def::Res;
+use rustc_hir::{Expr, ExprKind, PrimTy, QPath, TraitItem, TraitItemKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, TraitRef, Ty};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{sym, Span};
+use rustc_typeck::hir_ty_to_ty;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `cloned()` on an `Iterator` or `Option` where
+ /// `copied()` could be used instead.
+ ///
+ /// ### Why is this bad?
+ /// `copied()` is better because it guarantees that the type being cloned
+ /// implements `Copy`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1, 2, 3].iter().cloned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// [1, 2, 3].iter().copied();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub CLONED_INSTEAD_OF_COPIED,
+ pedantic,
+ "used `cloned` where `copied` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.cloned().<func>()` where call to `.cloned()` can be postponed.
+ ///
+ /// ### Why is this bad?
+ /// It's often inefficient to clone all elements of an iterator, when eventually, only some
+ /// of them will be consumed.
+ ///
+ /// ### Known Problems
+ /// This `lint` removes the side of effect of cloning items in the iterator.
+ /// A code that relies on that side-effect could fail.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let vec = vec!["string".to_string()];
+ /// vec.iter().cloned().take(10);
+ /// vec.iter().cloned().last();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec!["string".to_string()];
+ /// vec.iter().take(10).cloned();
+ /// vec.iter().last().cloned();
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub ITER_OVEREAGER_CLONED,
+ perf,
+ "using `cloned()` early with `Iterator::iter()` can lead to some performance inefficiencies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
+ /// used instead.
+ ///
+ /// ### Why is this bad?
+ /// When applicable, `filter_map()` is more clear since it shows that
+ /// `Option` is used to produce 0 or 1 items.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().flat_map(|x| x.parse().ok()).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().filter_map(|x| x.parse().ok()).collect();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub FLAT_MAP_OPTION,
+ pedantic,
+ "used `flat_map` where `filter_map` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.unwrap()` calls on `Option`s and on `Result`s.
+ ///
+ /// ### Why is this bad?
+ /// It is better to handle the `None` or `Err` case,
+ /// or at least call `.expect(_)` with a more helpful message. Still, for a lot of
+ /// quick-and-dirty code, `unwrap` is a good choice, which is why this lint is
+ /// `Allow` by default.
+ ///
+ /// `result.unwrap()` will let the thread panic on `Err` values.
+ /// Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// Even if you want to panic on errors, not all `Error`s implement good
+ /// messages on display. Therefore, it may be beneficial to look at the places
+ /// where they may get displayed. Activate this lint to do just that.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.unwrap();
+ /// result.unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.expect("more helpful message");
+ /// result.expect("more helpful message");
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub UNWRAP_USED,
+ restriction,
+ "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.expect()` calls on `Option`s and `Result`s.
+ ///
+ /// ### Why is this bad?
+ /// Usually it is better to handle the `None` or `Err` case.
+ /// Still, for a lot of quick-and-dirty code, `expect` is a good choice, which is why
+ /// this lint is `Allow` by default.
+ ///
+ /// `result.expect()` will let the thread panic on `Err`
+ /// values. Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// ### Examples
+ /// ```rust,ignore
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option.expect("one");
+ /// result.expect("one");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// option?;
+ ///
+ /// // or
+ ///
+ /// result?;
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub EXPECT_USED,
+ restriction,
+ "using `.expect()` on `Result` or `Option`, which might be better handled"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods that should live in a trait
+ /// implementation of a `std` trait (see [llogiq's blog
+ /// post](http://llogiq.github.io/2015/07/30/traits.html) for further
+ /// information) instead of an inherent implementation.
+ ///
+ /// ### Why is this bad?
+ /// Implementing the traits improve ergonomics for users of
+ /// the code, often with very little cost. Also people seeing a `mul(...)`
+ /// method
+ /// may expect `*` to work equally, so you should have good reason to disappoint
+ /// them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct X;
+ /// impl X {
+ /// fn add(&self, other: &X) -> X {
+ /// // ..
+ /// # X
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHOULD_IMPLEMENT_TRAIT,
+ style,
+ "defining a method that should be implementing a std trait"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods with certain name prefixes and which
+ /// doesn't match how self is taken. The actual rules are:
+ ///
+ /// |Prefix |Postfix |`self` taken | `self` type |
+ /// |-------|------------|-------------------------------|--------------|
+ /// |`as_` | none |`&self` or `&mut self` | any |
+ /// |`from_`| none | none | any |
+ /// |`into_`| none |`self` | any |
+ /// |`is_` | none |`&mut self` or `&self` or none | any |
+ /// |`to_` | `_mut` |`&mut self` | any |
+ /// |`to_` | not `_mut` |`self` | `Copy` |
+ /// |`to_` | not `_mut` |`&self` | not `Copy` |
+ ///
+ /// Note: Clippy doesn't trigger methods with `to_` prefix in:
+ /// - Traits definition.
+ /// Clippy can not tell if a type that implements a trait is `Copy` or not.
+ /// - Traits implementation, when `&self` is taken.
+ /// The method signature is controlled by the trait and often `&self` is required for all types that implement the trait
+ /// (see e.g. the `std::string::ToString` trait).
+ ///
+ /// Clippy allows `Pin<&Self>` and `Pin<&mut Self>` if `&self` and `&mut self` is required.
+ ///
+ /// Please find more info here:
+ /// https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
+ ///
+ /// ### Why is this bad?
+ /// Consistency breeds readability. If you follow the
+ /// conventions, your users won't be surprised that they, e.g., need to supply a
+ /// mutable reference to a `as_..` function.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct X;
+ /// impl X {
+ /// fn as_str(self) -> &'static str {
+ /// // ..
+ /// # ""
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub WRONG_SELF_CONVENTION,
+ style,
+ "defining a method named with an established prefix (like \"into_\") that takes `self` with the wrong convention"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `ok().expect(..)`.
+ ///
+ /// ### Why is this bad?
+ /// Because you usually call `expect()` on the `Result`
+ /// directly to get a better error message.
+ ///
+ /// ### Known problems
+ /// The error type needs to implement `Debug`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = Ok::<_, ()>(());
+ /// x.ok().expect("why did I do this again?");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = Ok::<_, ()>(());
+ /// x.expect("why did I do this again?");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OK_EXPECT,
+ style,
+ "using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.err().expect()` calls on the `Result` type.
+ ///
+ /// ### Why is this bad?
+ /// `.expect_err()` can be called directly to avoid the extra type conversion from `err()`.
+ ///
+ /// ### Example
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.err().expect("Testing err().expect()");
+ /// ```
+ /// Use instead:
+ /// ```should_panic
+ /// let x: Result<u32, &str> = Ok(10);
+ /// x.expect_err("Testing expect_err");
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub ERR_EXPECT,
+ style,
+ r#"using `.err().expect("")` when `.expect_err("")` can be used"#
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `_.unwrap_or_else(Default::default)` on `Option` and
+ /// `Result` values.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written as `_.unwrap_or_default`, which is
+ /// simpler and more concise.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let x = Some(1);
+ /// x.unwrap_or_else(Default::default);
+ /// x.unwrap_or_else(u32::default);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = Some(1);
+ /// x.unwrap_or_default();
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub UNWRAP_OR_ELSE_DEFAULT,
+ style,
+ "using `.unwrap_or_else(Default::default)`, which is more succinctly expressed as `.unwrap_or_default()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `option.map(_).unwrap_or(_)` or `option.map(_).unwrap_or_else(_)` or
+ /// `result.map(_).unwrap_or_else(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written more concisely (resp.) as
+ /// `option.map_or(_, _)`, `option.map_or_else(_, _)` and `result.map_or_else(_, _)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// # fn some_function(foo: ()) -> usize { 1 }
+ /// option.map(|a| a + 1).unwrap_or(0);
+ /// result.map(|a| a + 1).unwrap_or_else(some_function);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let option = Some(1);
+ /// # let result: Result<usize, ()> = Ok(1);
+ /// # fn some_function(foo: ()) -> usize { 1 }
+ /// option.map_or(0, |a| a + 1);
+ /// result.map_or_else(some_function, |a| a + 1);
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MAP_UNWRAP_OR,
+ pedantic,
+ "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, _)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.and_then(_)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some(1);
+ /// opt.map_or(None, |a| Some(a + 1));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let opt = Some(1);
+ /// opt.and_then(|a| Some(a + 1));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OPTION_MAP_OR_NONE,
+ style,
+ "using `Option.map_or(None, f)`, which is more succinctly expressed as `and_then(f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, Some)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ok()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.map_or(None, Some));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.ok());
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub RESULT_MAP_OR_INTO_OPTION,
+ style,
+ "using `Result.map_or(None, Some)`, which is more succinctly expressed as `ok()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or
+ /// `_.or_else(|x| Err(y))`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.map(|x| y)` or `_.map_err(|x| y)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().and_then(|s| Some(s.len()));
+ /// let _ = res().and_then(|s| if s.len() == 42 { Ok(10) } else { Ok(20) });
+ /// let _ = res().or_else(|s| if s.len() == 42 { Err(10) } else { Err(20) });
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().map(|s| s.len());
+ /// let _ = res().map(|s| if s.len() == 42 { 10 } else { 20 });
+ /// let _ = res().map_err(|s| if s.len() == 42 { 10 } else { 20 });
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub BIND_INSTEAD_OF_MAP,
+ complexity,
+ "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().filter(|x| **x == 0).next();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FILTER_NEXT,
+ complexity,
+ "using `filter(p).next()`, which is more succinctly expressed as `.find(p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.skip_while(condition).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(!condition)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().skip_while(|x| **x == 0).next();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x != 0);
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub SKIP_WHILE_NEXT,
+ complexity,
+ "using `skip_while(p).next()`, which is more succinctly expressed as `.find(!p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).flatten(_)` on `Iterator` and `Option`
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.flat_map(_)` for `Iterator` or `_.and_then(_)` for `Option`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec = vec![vec![1]];
+ /// let opt = Some(5);
+ ///
+ /// vec.iter().map(|x| x.iter()).flatten();
+ /// opt.map(|x| Some(x * 2)).flatten();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![vec![1]];
+ /// # let opt = Some(5);
+ /// vec.iter().flat_map(|x| x.iter());
+ /// opt.and_then(|x| Some(x * 2));
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub MAP_FLATTEN,
+ complexity,
+ "using combinations of `flatten` and `map` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).map(_)` that can be written more simply
+ /// as `filter_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `filter` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// (0_i32..10)
+ /// .filter(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # #[allow(unused)]
+ /// (0_i32..10).filter_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FILTER_MAP,
+ complexity,
+ "using `_.filter(_).map(_)` in a way that can be written more simply as `filter_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.find(_).map(_)` that can be written more simply
+ /// as `find_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `find` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0_i32..10)
+ /// .find(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// (0_i32..10).find_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FIND_MAP,
+ complexity,
+ "using `_.find(_).map(_)` in a way that can be written more simply as `find_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter_map(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find_map(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).filter_map(|x| if x == 2 { Some(x) } else { None }).next();
+ /// ```
+ /// Can be written as
+ ///
+ /// ```rust
+ /// (0..3).find_map(|x| if x == 2 { Some(x) } else { None });
+ /// ```
+ #[clippy::version = "1.36.0"]
+ pub FILTER_MAP_NEXT,
+ pedantic,
+ "using combination of `filter_map` and `next` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `flat_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flat_map(|x| x);
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub FLAT_MAP_IDENTITY,
+ complexity,
+ "call to `flat_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for an iterator or string search (such as `find()`,
+ /// `position()`, or `rposition()`) followed by a call to `is_some()` or `is_none()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as:
+ /// * `_.any(_)`, or `_.contains(_)` for `is_some()`,
+ /// * `!_.any(_)`, or `!_.contains(_)` for `is_none()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0).is_some();
+ ///
+ /// "hello world".find("world").is_none();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let vec = vec![1];
+ /// vec.iter().any(|x| *x == 0);
+ ///
+ /// # #[allow(unused)]
+ /// !"hello world".contains("world");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SEARCH_IS_SOME,
+ complexity,
+ "using an iterator or string search followed by `is_some()` or `is_none()`, which is more succinctly expressed as a call to `any()` or `contains()` (with negation in case of `is_none()`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.chars().next()` on a `str` to check
+ /// if it starts with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.starts_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let name = "foo";
+ /// if name.chars().next() == Some('_') {};
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let name = "foo";
+ /// if name.starts_with('_') {};
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_NEXT_CMP,
+ style,
+ "using `.chars().next()` to check if a string starts with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.or(foo(..))`, `.unwrap_or(foo(..))`,
+ /// etc., and suggests to use `or_else`, `unwrap_or_else`, etc., or
+ /// `unwrap_or_default` instead.
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called and potentially
+ /// allocate an object acting as the default.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantic of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or(String::new());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_else(String::new);
+ ///
+ /// // or
+ ///
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_default();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OR_FUN_CALL,
+ perf,
+ "using any `*or` method with a function call, which suggests `*or_else`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.or(…).unwrap()` calls to Options and Results.
+ ///
+ /// ### Why is this bad?
+ /// You should use `.unwrap_or(…)` instead for clarity.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let fallback = "fallback";
+ /// // Result
+ /// # type Error = &'static str;
+ /// # let result: Result<&str, Error> = Err("error");
+ /// let value = result.or::<Error>(Ok(fallback)).unwrap();
+ ///
+ /// // Option
+ /// # let option: Option<&str> = None;
+ /// let value = option.or(Some(fallback)).unwrap();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let fallback = "fallback";
+ /// // Result
+ /// # let result: Result<&str, &str> = Err("error");
+ /// let value = result.unwrap_or(fallback);
+ ///
+ /// // Option
+ /// # let option: Option<&str> = None;
+ /// let value = option.unwrap_or(fallback);
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub OR_THEN_UNWRAP,
+ complexity,
+ "checks for `.or(…).unwrap()` calls to Options and Results."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.expect(&format!(...))`, `.expect(foo(..))`,
+ /// etc., and suggests to use `unwrap_or_else` instead
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantics of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.expect(&format!("Err {}: {}", err_code, err_msg));
+ ///
+ /// // or
+ ///
+ /// # let foo = Some(String::new());
+ /// foo.expect(format!("Err {}: {}", err_code, err_msg).as_str());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.unwrap_or_else(|| panic!("Err {}: {}", err_code, err_msg));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXPECT_FUN_CALL,
+ perf,
+ "using any `expect` method with a function call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a `Copy` type.
+ ///
+ /// ### Why is this bad?
+ /// The only reason `Copy` types implement `Clone` is for
+ /// generics, not for using the `clone` method on a concrete type.
+ ///
+ /// ### Example
+ /// ```rust
+ /// 42u64.clone();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_COPY,
+ complexity,
+ "using `clone` on a `Copy` type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a ref-counted pointer,
+ /// (`Rc`, `Arc`, `rc::Weak`, or `sync::Weak`), and suggests calling Clone via unified
+ /// function syntax instead (e.g., `Rc::clone(foo)`).
+ ///
+ /// ### Why is this bad?
+ /// Calling '.clone()' on an Rc, Arc, or Weak
+ /// can obscure the fact that only the pointer is being cloned, not the underlying
+ /// data.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// let x = Rc::new(1);
+ ///
+ /// x.clone();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// # let x = Rc::new(1);
+ /// Rc::clone(&x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_REF_PTR,
+ restriction,
+ "using 'clone' on a ref-counted pointer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on an `&&T`.
+ ///
+ /// ### Why is this bad?
+ /// Cloning an `&&T` copies the inner `&T`, instead of
+ /// cloning the underlying `T`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// let x = vec![1];
+ /// let y = &&x;
+ /// let z = y.clone();
+ /// println!("{:p} {:p}", *y, z); // prints out the same pointer
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_DOUBLE_REF,
+ correctness,
+ "using `clone` on `&&T`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.to_string()` on an `&&T` where
+ /// `T` implements `ToString` directly (like `&&str` or `&&String`).
+ ///
+ /// ### Why is this bad?
+ /// This bypasses the specialized implementation of
+ /// `ToString` and instead goes through the more expensive string formatting
+ /// facilities.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Generic implementation for `T: Display` is used (slow)
+ /// ["foo", "bar"].iter().map(|s| s.to_string());
+ ///
+ /// // OK, the specialized impl is used
+ /// ["foo", "bar"].iter().map(|&s| s.to_string());
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub INEFFICIENT_TO_STRING,
+ pedantic,
+ "using `to_string` on `&&T` where `T: ToString`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `new` not returning a type that contains `Self`.
+ ///
+ /// ### Why is this bad?
+ /// As a convention, `new` methods are used to make a new
+ /// instance of a type.
+ ///
+ /// ### Example
+ /// In an impl block:
+ /// ```rust
+ /// # struct Foo;
+ /// # struct NotAFoo;
+ /// impl Foo {
+ /// fn new() -> NotAFoo {
+ /// # NotAFoo
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// struct Bar(Foo);
+ /// impl Foo {
+ /// // Bad. The type name must contain `Self`
+ /// fn new() -> Bar {
+ /// # Bar(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// # struct FooError;
+ /// impl Foo {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Result<Foo, FooError> {
+ /// # Ok(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Or in a trait definition:
+ /// ```rust
+ /// pub trait Trait {
+ /// // Bad. The type name must contain `Self`
+ /// fn new();
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// pub trait Trait {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Self;
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEW_RET_NO_SELF,
+ style,
+ "not returning type containing `Self` in a `new` method"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for string methods that receive a single-character
+ /// `str` as an argument, e.g., `_.split("x")`.
+ ///
+ /// ### Why is this bad?
+ /// Performing these methods using a `char` is faster than
+ /// using a `str`.
+ ///
+ /// ### Known problems
+ /// Does not catch multi-byte unicode characters.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// _.split("x");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// _.split('x');
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_CHAR_PATTERN,
+ perf,
+ "using a single-character str where a char could be used, e.g., `_.split(\"x\")`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calling `.step_by(0)` on iterators which panics.
+ ///
+ /// ### Why is this bad?
+ /// This very much looks like an oversight. Use `panic!()` instead if you
+ /// actually intend to panic.
+ ///
+ /// ### Example
+ /// ```rust,should_panic
+ /// for x in (0..100).step_by(0) {
+ /// //..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITERATOR_STEP_BY_ZERO,
+ correctness,
+ "using `Iterator::step_by(0)`, which will panic at runtime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for indirect collection of populated `Option`
+ ///
+ /// ### Why is this bad?
+ /// `Option` is like a collection of 0-1 things, so `flatten`
+ /// automatically does this without suspicious-looking `unwrap` calls.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().filter(Option::is_some).map(Option::unwrap);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().flatten();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub OPTION_FILTER_MAP,
+ complexity,
+ "filtering `Option` for `Some` then force-unwrapping, which can be one type-safe operation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `iter.nth(0)`.
+ ///
+ /// ### Why is this bad?
+ /// `iter.next()` is equivalent to
+ /// `iter.nth(0)`, as they both consume the next element,
+ /// but is more readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().nth(0);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().next();
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub ITER_NTH_ZERO,
+ style,
+ "replace `iter.nth(0)` with `iter.next()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.iter().nth()` (and the related
+ /// `.iter_mut().nth()`) on standard library types with *O*(1) element access.
+ ///
+ /// ### Why is this bad?
+ /// `.get()` and `.get_mut()` are more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.get(3);
+ /// let bad_slice = &some_vec[..].get(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_NTH,
+ perf,
+ "using `.iter().nth()` on a standard library type with O(1) element access"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.skip(x).next()` on iterators.
+ ///
+ /// ### Why is this bad?
+ /// `.nth(x)` is cleaner
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().skip(3).next();
+ /// let bad_slice = &some_vec[..].iter().skip(3).next();
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_SKIP_NEXT,
+ style,
+ "using `.skip(x).next()` on an iterator"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.drain(..)` on `Vec` and `VecDeque` for iteration.
+ ///
+ /// ### Why is this bad?
+ /// `.into_iter()` is simpler with better performance.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// let mut foo = vec![0, 1, 2, 3];
+ /// let bar: HashSet<usize> = foo.drain(..).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// let foo = vec![0, 1, 2, 3];
+ /// let bar: HashSet<usize> = foo.into_iter().collect();
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub ITER_WITH_DRAIN,
+ nursery,
+ "replace `.drain(..)` with `.into_iter()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `x.get(x.len() - 1)` instead of
+ /// `x.last()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `x.last()` is easier to read and has the same
+ /// result.
+ ///
+ /// Note that using `x[x.len() - 1]` is semantically different from
+ /// `x.last()`. Indexing into the array will panic on out-of-bounds
+ /// accesses, while `x.get()` and `x.last()` will return `None`.
+ ///
+ /// There is another lint (get_unwrap) that covers the case of using
+ /// `x.get(index).unwrap()` instead of `x[index]`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let last_element = x.get(x.len() - 1);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = vec![2, 3, 5];
+ /// let last_element = x.last();
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub GET_LAST_WITH_LEN,
+ complexity,
+ "Using `x.get(x.len() - 1)` when `x.last()` is correct and simpler"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.get().unwrap()` (or
+ /// `.get_mut().unwrap`) on a standard library type which implements `Index`
+ ///
+ /// ### Why is this bad?
+ /// Using the Index trait (`[]`) is more clear and more
+ /// concise.
+ ///
+ /// ### Known problems
+ /// Not a replacement for error handling: Using either
+ /// `.unwrap()` or the Index trait (`[]`) carries the risk of causing a `panic`
+ /// if the value being accessed is `None`. If the use of `.get().unwrap()` is a
+ /// temporary placeholder for dealing with the `Option` type, then this does
+ /// not mitigate the need for error handling. If there is a chance that `.get()`
+ /// will be `None` in your program, then it is advisable that the `None` case
+ /// is handled in a future refactor instead of using `.unwrap()` or the Index
+ /// trait.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec.get(3).unwrap();
+ /// *some_vec.get_mut(0).unwrap() = 1;
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec[3];
+ /// some_vec[0] = 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub GET_UNWRAP,
+ restriction,
+ "using `.get().unwrap()` or `.get_mut().unwrap()` when using `[]` would work instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for occurrences where one vector gets extended instead of append
+ ///
+ /// ### Why is this bad?
+ /// Using `append` instead of `extend` is more concise and faster
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = vec![1, 2, 3];
+ /// let mut b = vec![4, 5, 6];
+ ///
+ /// a.extend(b.drain(..));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut a = vec![1, 2, 3];
+ /// let mut b = vec![4, 5, 6];
+ ///
+ /// a.append(&mut b);
+ /// ```
+ #[clippy::version = "1.55.0"]
+ pub EXTEND_WITH_DRAIN,
+ perf,
+ "using vec.append(&mut vec) to move the full range of a vector to another"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.extend(s.chars())` where s is a
+ /// `&str` or `String`.
+ ///
+ /// ### Why is this bad?
+ /// `.push_str(s)` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.extend(abc.chars());
+ /// s.extend(def.chars());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.push_str(abc);
+ /// s.push_str(&def);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_EXTEND_CHARS,
+ style,
+ "using `x.extend(s.chars())` where s is a `&str` or `String`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.cloned().collect()` on slice to
+ /// create a `Vec`.
+ ///
+ /// ### Why is this bad?
+ /// `.to_vec()` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s[..].iter().cloned().collect();
+ /// ```
+ /// The better use would be:
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s.to_vec();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_CLONED_COLLECT,
+ style,
+ "using `.cloned().collect()` on slice to create a `Vec`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.chars().last()` or
+ /// `_.chars().next_back()` on a `str` to check if it ends with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ends_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let name = "_";
+ /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-');
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let name = "_";
+ /// name.ends_with('_') || name.ends_with('-');
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_LAST_CMP,
+ style,
+ "using `.chars().last()` or `.chars().next_back()` to check if a string ends with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.as_ref()` or `.as_mut()` where the
+ /// types before and after the call are the same.
+ ///
+ /// ### Why is this bad?
+ /// The call is unnecessary.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x.as_ref());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub USELESS_ASREF,
+ complexity,
+ "using `as_ref` where the types before and after the call are the same"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `fold` when a more succinct alternative exists.
+ /// Specifically, this checks for `fold`s which could be replaced by `any`, `all`,
+ /// `sum` or `product`.
+ ///
+ /// ### Why is this bad?
+ /// Readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #[allow(unused)]
+ /// (0..3).fold(false, |acc, x| acc || x > 2);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// (0..3).any(|x| x > 2);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNNECESSARY_FOLD,
+ style,
+ "using `fold` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `filter_map` calls that could be replaced by `filter` or `map`.
+ /// More specifically it checks if the closure provided is only performing one of the
+ /// filter or map operations and suggests the appropriate option.
+ ///
+ /// ### Why is this bad?
+ /// Complexity. The intent is also clearer if only a single
+ /// operation is being performed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).filter_map(|x| if x > 2 { Some(x) } else { None });
+ ///
+ /// // As there is no transformation of the argument this could be written as:
+ /// let _ = (0..3).filter(|&x| x > 2);
+ /// ```
+ ///
+ /// ```rust
+ /// let _ = (0..4).filter_map(|x| Some(x + 1));
+ ///
+ /// // As there is no conditional check on the argument this could be written as:
+ /// let _ = (0..4).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub UNNECESSARY_FILTER_MAP,
+ complexity,
+ "using `filter_map` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `find_map` calls that could be replaced by `find` or `map`. More
+ /// specifically it checks if the closure provided is only performing one of the
+ /// find or map operations and suggests the appropriate option.
+ ///
+ /// ### Why is this bad?
+ /// Complexity. The intent is also clearer if only a single
+ /// operation is being performed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).find_map(|x| if x > 2 { Some(x) } else { None });
+ ///
+ /// // As there is no transformation of the argument this could be written as:
+ /// let _ = (0..3).find(|&x| x > 2);
+ /// ```
+ ///
+ /// ```rust
+ /// let _ = (0..4).find_map(|x| Some(x + 1));
+ ///
+ /// // As there is no conditional check on the argument this could be written as:
+ /// let _ = (0..4).map(|x| x + 1).next();
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub UNNECESSARY_FIND_MAP,
+ complexity,
+ "using `find_map` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `into_iter` calls on references which should be replaced by `iter`
+ /// or `iter_mut`.
+ ///
+ /// ### Why is this bad?
+ /// Readability. Calling `into_iter` on a reference will not move out its
+ /// content into the resulting iterator, which is confusing. It is better just call `iter` or
+ /// `iter_mut` directly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![3, 4, 5];
+ /// (&vec).into_iter();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let vec = vec![3, 4, 5];
+ /// (&vec).iter();
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub INTO_ITER_ON_REF,
+ style,
+ "using `.into_iter()` on a reference"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `map` followed by a `count`.
+ ///
+ /// ### Why is this bad?
+ /// It looks suspicious. Maybe `map` was confused with `filter`.
+ /// If the `map` call is intentional, this should be rewritten
+ /// using `inspect`. Or, if you intend to drive the iterator to
+ /// completion, you can just use `for_each` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).map(|x| x + 2).count();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub SUSPICIOUS_MAP,
+ suspicious,
+ "suspicious usage of map"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `MaybeUninit::uninit().assume_init()`.
+ ///
+ /// ### Why is this bad?
+ /// For most types, this is undefined behavior.
+ ///
+ /// ### Known problems
+ /// For now, we accept empty tuples and tuples / arrays
+ /// of `MaybeUninit`. There may be other types that allow uninitialized
+ /// data, but those are not yet rigorously defined.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Beware the UB
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: usize = unsafe { MaybeUninit::uninit().assume_init() };
+ /// ```
+ ///
+ /// Note that the following is OK:
+ ///
+ /// ```rust
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: [MaybeUninit<bool>; 5] = unsafe {
+ /// MaybeUninit::uninit().assume_init()
+ /// };
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub UNINIT_ASSUMED_INIT,
+ correctness,
+ "`MaybeUninit::uninit().assume_init()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.checked_add/sub(x).unwrap_or(MAX/MIN)`.
+ ///
+ /// ### Why is this bad?
+ /// These can be written simply with `saturating_add/sub` methods.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.checked_add(y).unwrap_or(u32::MAX);
+ /// let sub = x.checked_sub(y).unwrap_or(u32::MIN);
+ /// ```
+ ///
+ /// can be written using dedicated methods for saturating addition/subtraction as:
+ ///
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.saturating_add(y);
+ /// let sub = x.saturating_sub(y);
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub MANUAL_SATURATING_ARITHMETIC,
+ style,
+ "`.checked_add/sub(x).unwrap_or(MAX/MIN)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `offset(_)`, `wrapping_`{`add`, `sub`}, etc. on raw pointers to
+ /// zero-sized types
+ ///
+ /// ### Why is this bad?
+ /// This is a no-op, and likely unintended
+ ///
+ /// ### Example
+ /// ```rust
+ /// unsafe { (&() as *const ()).offset(1) };
+ /// ```
+ #[clippy::version = "1.41.0"]
+ pub ZST_OFFSET,
+ correctness,
+ "Check for offset calculations on raw pointers to zero-sized types"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `FileType::is_file()`.
+ ///
+ /// ### Why is this bad?
+ /// When people testing a file type with `FileType::is_file`
+ /// they are testing whether a path is something they can get bytes from. But
+ /// `is_file` doesn't cover special file types in unix-like systems, and doesn't cover
+ /// symlink in windows. Using `!FileType::is_dir()` is a better way to that intention.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if filetype.is_file() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ ///
+ /// should be written as:
+ ///
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if !filetype.is_dir() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub FILETYPE_IS_FILE,
+ restriction,
+ "`FileType::is_file` is not recommended to test for readable file type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.as_ref().map(Deref::deref)` or it's aliases (such as String::as_str).
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.as_deref()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_ref().map(String::as_str)
+ /// # ;
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_deref()
+ /// # ;
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub OPTION_AS_REF_DEREF,
+ complexity,
+ "using `as_ref().map(Deref::deref)`, which is more succinctly expressed as `as_deref()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `iter().next()` on a Slice or an Array
+ ///
+ /// ### Why is this bad?
+ /// These can be shortened into `.get()`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a[2..].iter().next();
+ /// b.iter().next();
+ /// ```
+ /// should be written as:
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a.get(2);
+ /// b.get(0);
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub ITER_NEXT_SLICE,
+ style,
+ "using `.iter().next()` on a sliced array, which can be shortened to just `.get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns when using `push_str`/`insert_str` with a single-character string literal
+ /// where `push`/`insert` with a `char` would work fine.
+ ///
+ /// ### Why is this bad?
+ /// It's less clear that we are pushing a single character.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let mut string = String::new();
+ /// string.insert_str(0, "R");
+ /// string.push_str("R");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let mut string = String::new();
+ /// string.insert(0, 'R');
+ /// string.push('R');
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub SINGLE_CHAR_ADD_STR,
+ style,
+ "`push_str()` or `insert_str()` used with a single-character string literal as parameter"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// As the counterpart to `or_fun_call`, this lint looks for unnecessary
+ /// lazily evaluated closures on `Option` and `Result`.
+ ///
+ /// This lint suggests changing the following functions, when eager evaluation results in
+ /// simpler code:
+ /// - `unwrap_or_else` to `unwrap_or`
+ /// - `and_then` to `and`
+ /// - `or_else` to `or`
+ /// - `get_or_insert_with` to `get_or_insert`
+ /// - `ok_or_else` to `ok_or`
+ ///
+ /// ### Why is this bad?
+ /// Using eager evaluation is shorter and simpler in some cases.
+ ///
+ /// ### Known problems
+ /// It is possible, but not recommended for `Deref` and `Index` to have
+ /// side effects. Eagerly evaluating them can change the semantics of the program.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or_else(|| 42);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or(42);
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub UNNECESSARY_LAZY_EVALUATIONS,
+ style,
+ "using unnecessary lazy evaluation, which can be replaced with simpler eager evaluation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).collect::<Result<(), _>()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `try_for_each` instead is more readable and idiomatic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).map(|t| Err(t)).collect::<Result<(), _>>();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// (0..3).try_for_each(|t| Err(t));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MAP_COLLECT_RESULT_UNIT,
+ style,
+ "using `.map(_).collect::<Result<(),_>()`, which can be replaced with `try_for_each`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `from_iter()` function calls on types that implement the `FromIterator`
+ /// trait.
+ ///
+ /// ### Why is this bad?
+ /// It is recommended style to use collect. See
+ /// [FromIterator documentation](https://doc.rust-lang.org/std/iter/trait.FromIterator.html)
+ ///
+ /// ### Example
+ /// ```rust
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v = Vec::from_iter(five_fives);
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v: Vec<i32> = five_fives.collect();
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub FROM_ITER_INSTEAD_OF_COLLECT,
+ pedantic,
+ "use `.collect()` instead of `::from_iter()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `inspect().for_each()`.
+ ///
+ /// ### Why is this bad?
+ /// It is the same as performing the computation
+ /// inside `inspect` at the beginning of the closure in `for_each`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .inspect(|&x| println!("inspect the number: {}", x))
+ /// .for_each(|&x| {
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .for_each(|&x| {
+ /// println!("inspect the number: {}", x);
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub INSPECT_FOR_EACH,
+ complexity,
+ "using `.inspect().for_each()`, which can be replaced with `.for_each()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `filter_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.filter_map(|x| x);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub FILTER_MAP_IDENTITY,
+ complexity,
+ "call to `filter_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for instances of `map(f)` where `f` is the identity function.
+ ///
+ /// ### Why is this bad?
+ /// It can be written more concisely without the call to `map`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| x).map(|x| 2*x).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| 2*x).collect();
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MAP_IDENTITY,
+ complexity,
+ "using iterator.map(|x| x)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.bytes().nth()`.
+ ///
+ /// ### Why is this bad?
+ /// `.as_bytes().get()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #[allow(unused)]
+ /// "Hello".bytes().nth(3);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # #[allow(unused)]
+ /// "Hello".as_bytes().get(3);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub BYTES_NTH,
+ style,
+ "replace `.bytes().nth()` with `.as_bytes().get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `_.to_owned()`, `vec.to_vec()`, or similar when calling `_.clone()` would be clearer.
+ ///
+ /// ### Why is this bad?
+ /// These methods do the same thing as `_.clone()` but may be confusing as
+ /// to why we are calling `to_vec` on something that is already a `Vec` or calling `to_owned` on something that is already owned.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.to_vec();
+ /// let c = a.to_owned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.clone();
+ /// let c = a.clone();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub IMPLICIT_CLONE,
+ pedantic,
+ "implicitly cloning a value by invoking a function on its dereferenced type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.iter().count()`.
+ ///
+ /// ### Why is this bad?
+ /// `.len()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # #![allow(unused)]
+ /// let some_vec = vec![0, 1, 2, 3];
+ ///
+ /// some_vec.iter().count();
+ /// &some_vec[..].iter().count();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ ///
+ /// some_vec.len();
+ /// &some_vec[..].len();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub ITER_COUNT,
+ complexity,
+ "replace `.iter().count()` with `.len()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to [`splitn`]
+ /// (https://doc.rust-lang.org/std/primitive.str.html#method.splitn) and
+ /// related functions with either zero or one splits.
+ ///
+ /// ### Why is this bad?
+ /// These calls don't actually split the value and are
+ /// likely to be intended as a different number.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let s = "";
+ /// for x in s.splitn(1, ":") {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let s = "";
+ /// for x in s.splitn(2, ":") {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub SUSPICIOUS_SPLITN,
+ correctness,
+ "checks for `.splitn(0, ..)` and `.splitn(1, ..)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for manual implementations of `str::repeat`
+ ///
+ /// ### Why is this bad?
+ /// These are both harder to read, as well as less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: String = std::iter::repeat('x').take(10).collect();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x: String = "x".repeat(10);
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub MANUAL_STR_REPEAT,
+ perf,
+ "manual implementation of `str::repeat`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn(2, _)`
+ ///
+ /// ### Why is this bad?
+ /// `split_once` is both clearer in intent and slightly more efficient.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let s = "key=value=add";
+ /// let (key, value) = s.splitn(2, '=').next_tuple()?;
+ /// let value = s.splitn(2, '=').nth(1)?;
+ ///
+ /// let mut parts = s.splitn(2, '=');
+ /// let key = parts.next()?;
+ /// let value = parts.next()?;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// let s = "key=value=add";
+ /// let (key, value) = s.split_once('=')?;
+ /// let value = s.split_once('=')?.1;
+ ///
+ /// let (key, value) = s.split_once('=')?;
+ /// ```
+ ///
+ /// ### Limitations
+ /// The multiple statement variant currently only detects `iter.next()?`/`iter.next().unwrap()`
+ /// in two separate `let` statements that immediately follow the `splitn()`
+ #[clippy::version = "1.57.0"]
+ pub MANUAL_SPLIT_ONCE,
+ complexity,
+ "replace `.splitn(2, pat)` with `.split_once(pat)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn` (or `str::rsplitn`) where using `str::split` would be the same.
+ /// ### Why is this bad?
+ /// The function `split` is simpler and there is no performance difference in these cases, considering
+ /// that both functions return a lazy iterator.
+ /// ### Example
+ /// ```rust
+ /// let str = "key=value=add";
+ /// let _ = str.splitn(3, '=').next().unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let str = "key=value=add";
+ /// let _ = str.split('=').next().unwrap();
+ /// ```
+ #[clippy::version = "1.59.0"]
+ pub NEEDLESS_SPLITN,
+ complexity,
+ "usages of `str::splitn` that can be replaced with `str::split`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary calls to [`ToOwned::to_owned`](https://doc.rust-lang.org/std/borrow/trait.ToOwned.html#tymethod.to_owned)
+ /// and other `to_owned`-like functions.
+ ///
+ /// ### Why is this bad?
+ /// The unnecessary calls result in useless allocations.
+ ///
+ /// ### Known problems
+ /// `unnecessary_to_owned` can falsely trigger if `IntoIterator::into_iter` is applied to an
+ /// owned copy of a resource and the resource is later used mutably. See
+ /// [#8148](https://github.com/rust-lang/rust-clippy/issues/8148).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy().to_string());
+ /// fn foo(s: &str) {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy());
+ /// fn foo(s: &str) {}
+ /// ```
+ #[clippy::version = "1.59.0"]
+ pub UNNECESSARY_TO_OWNED,
+ perf,
+ "unnecessary calls to `to_owned`-like functions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.collect::<Vec<String>>().join("")` on iterators.
+ ///
+ /// ### Why is this bad?
+ /// `.collect::<String>()` is more concise and might be more performant
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vector = vec!["hello", "world"];
+ /// let output = vector.iter().map(|item| item.to_uppercase()).collect::<Vec<String>>().join("");
+ /// println!("{}", output);
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let vector = vec!["hello", "world"];
+ /// let output = vector.iter().map(|item| item.to_uppercase()).collect::<String>();
+ /// println!("{}", output);
+ /// ```
+ /// ### Known problems
+ /// While `.collect::<String>()` is sometimes more performant, there are cases where
+ /// using `.collect::<String>()` over `.collect::<Vec<String>>().join("")`
+ /// will prevent loop unrolling and will result in a negative performance impact.
+ ///
+ /// Additionally, differences have been observed between aarch64 and x86_64 assembly output,
+ /// with aarch64 tending to producing faster assembly in more cases when using `.collect::<String>()`
+ #[clippy::version = "1.61.0"]
+ pub UNNECESSARY_JOIN,
+ pedantic,
+ "using `.collect::<Vec<String>>().join(\"\")` on an iterator"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for no-op uses of `Option::{as_deref, as_deref_mut}`,
+ /// for example, `Option<&T>::as_deref()` returns the same type.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code and improving readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a.as_deref(); // goes from Option<&i32> to Option<&i32>
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let a = Some(&1);
+ /// let b = a;
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub NEEDLESS_OPTION_AS_DEREF,
+ complexity,
+ "no-op use of `deref` or `deref_mut` method to `Option`."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds usages of [`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) that
+ /// can be replaced with [`is_ascii_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_digit) or
+ /// [`is_ascii_hexdigit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_ascii_hexdigit).
+ ///
+ /// ### Why is this bad?
+ /// `is_digit(..)` is slower and requires specifying the radix.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_digit(10);
+ /// c.is_digit(16);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let c: char = '6';
+ /// c.is_ascii_digit();
+ /// c.is_ascii_hexdigit();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub IS_DIGIT_ASCII_RADIX,
+ style,
+ "use of `char::is_digit(..)` with literal radix of 10 or 16"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calling `take` function after `as_ref`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code. `take` writes `None` to its argument.
+ /// In this case the modification is useless as it's a temporary that cannot be read from afterwards.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(3);
+ /// x.as_ref().take();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = Some(3);
+ /// x.as_ref();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub NEEDLESS_OPTION_TAKE,
+ complexity,
+ "using `.as_ref().take()` on a temporary value"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `replace` statements which have no effect.
+ ///
+ /// ### Why is this bad?
+ /// It's either a mistake or confusing.
+ ///
+ /// ### Example
+ /// ```rust
+ /// "1234".replace("12", "12");
+ /// "1234".replacen("12", "12", 1);
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub NO_EFFECT_REPLACE,
+ suspicious,
+ "replace with no effect"
+}
+
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for usages of `.then_some(..).unwrap_or(..)`
++ ///
++ /// ### Why is this bad?
++ /// This can be written more clearly with `if .. else ..`
++ ///
++ /// ### Limitations
++ /// This lint currently only looks for usages of
++ /// `.then_some(..).unwrap_or(..)`, but will be expanded
++ /// to account for similar patterns.
++ ///
++ /// ### Example
++ /// ```rust
++ /// let x = true;
++ /// x.then_some("a").unwrap_or("b");
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// let x = true;
++ /// if x { "a" } else { "b" };
++ /// ```
++ #[clippy::version = "1.64.0"]
++ pub OBFUSCATED_IF_ELSE,
++ style,
++ "use of `.then_some(..).unwrap_or(..)` can be written \
++ more clearly with `if .. else ..`"
++}
++
+pub struct Methods {
+ avoid_breaking_exported_api: bool,
+ msrv: Option<RustcVersion>,
+ allow_expect_in_tests: bool,
+ allow_unwrap_in_tests: bool,
+}
+
+impl Methods {
+ #[must_use]
+ pub fn new(
+ avoid_breaking_exported_api: bool,
+ msrv: Option<RustcVersion>,
+ allow_expect_in_tests: bool,
+ allow_unwrap_in_tests: bool,
+ ) -> Self {
+ Self {
+ avoid_breaking_exported_api,
+ msrv,
+ allow_expect_in_tests,
+ allow_unwrap_in_tests,
+ }
+ }
+}
+
+impl_lint_pass!(Methods => [
+ UNWRAP_USED,
+ EXPECT_USED,
+ SHOULD_IMPLEMENT_TRAIT,
+ WRONG_SELF_CONVENTION,
+ OK_EXPECT,
+ UNWRAP_OR_ELSE_DEFAULT,
+ MAP_UNWRAP_OR,
+ RESULT_MAP_OR_INTO_OPTION,
+ OPTION_MAP_OR_NONE,
+ BIND_INSTEAD_OF_MAP,
+ OR_FUN_CALL,
+ OR_THEN_UNWRAP,
+ EXPECT_FUN_CALL,
+ CHARS_NEXT_CMP,
+ CHARS_LAST_CMP,
+ CLONE_ON_COPY,
+ CLONE_ON_REF_PTR,
+ CLONE_DOUBLE_REF,
+ ITER_OVEREAGER_CLONED,
+ CLONED_INSTEAD_OF_COPIED,
+ FLAT_MAP_OPTION,
+ INEFFICIENT_TO_STRING,
+ NEW_RET_NO_SELF,
+ SINGLE_CHAR_PATTERN,
+ SINGLE_CHAR_ADD_STR,
+ SEARCH_IS_SOME,
+ FILTER_NEXT,
+ SKIP_WHILE_NEXT,
+ FILTER_MAP_IDENTITY,
+ MAP_IDENTITY,
+ MANUAL_FILTER_MAP,
+ MANUAL_FIND_MAP,
+ OPTION_FILTER_MAP,
+ FILTER_MAP_NEXT,
+ FLAT_MAP_IDENTITY,
+ MAP_FLATTEN,
+ ITERATOR_STEP_BY_ZERO,
+ ITER_NEXT_SLICE,
+ ITER_COUNT,
+ ITER_NTH,
+ ITER_NTH_ZERO,
+ BYTES_NTH,
+ ITER_SKIP_NEXT,
+ GET_UNWRAP,
+ GET_LAST_WITH_LEN,
+ STRING_EXTEND_CHARS,
+ ITER_CLONED_COLLECT,
+ ITER_WITH_DRAIN,
+ USELESS_ASREF,
+ UNNECESSARY_FOLD,
+ UNNECESSARY_FILTER_MAP,
+ UNNECESSARY_FIND_MAP,
+ INTO_ITER_ON_REF,
+ SUSPICIOUS_MAP,
+ UNINIT_ASSUMED_INIT,
+ MANUAL_SATURATING_ARITHMETIC,
+ ZST_OFFSET,
+ FILETYPE_IS_FILE,
+ OPTION_AS_REF_DEREF,
+ UNNECESSARY_LAZY_EVALUATIONS,
+ MAP_COLLECT_RESULT_UNIT,
+ FROM_ITER_INSTEAD_OF_COLLECT,
+ INSPECT_FOR_EACH,
+ IMPLICIT_CLONE,
+ SUSPICIOUS_SPLITN,
+ MANUAL_STR_REPEAT,
+ EXTEND_WITH_DRAIN,
+ MANUAL_SPLIT_ONCE,
+ NEEDLESS_SPLITN,
+ UNNECESSARY_TO_OWNED,
+ UNNECESSARY_JOIN,
+ ERR_EXPECT,
+ NEEDLESS_OPTION_AS_DEREF,
+ IS_DIGIT_ASCII_RADIX,
+ NEEDLESS_OPTION_TAKE,
+ NO_EFFECT_REPLACE,
++ OBFUSCATED_IF_ELSE,
+]);
+
+/// Extracts a method call name, args, and `Span` of the method name.
+fn method_call<'tcx>(recv: &'tcx hir::Expr<'tcx>) -> Option<(&'tcx str, &'tcx [hir::Expr<'tcx>], Span)> {
+ if let ExprKind::MethodCall(path, args, _) = recv.kind {
+ if !args.iter().any(|e| e.span.from_expansion()) {
+ let name = path.ident.name.as_str();
+ return Some((name, args, path.ident.span));
+ }
+ }
+ None
+}
+
+impl<'tcx> LateLintPass<'tcx> for Methods {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ self.check_methods(cx, expr);
+
+ match expr.kind {
+ hir::ExprKind::Call(func, args) => {
+ from_iter_instead_of_collect::check(cx, expr, args, func);
+ },
+ hir::ExprKind::MethodCall(method_call, args, _) => {
+ let method_span = method_call.ident.span;
+ or_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), args);
+ expect_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), args);
+ clone_on_copy::check(cx, expr, method_call.ident.name, args);
+ clone_on_ref_ptr::check(cx, expr, method_call.ident.name, args);
+ inefficient_to_string::check(cx, expr, method_call.ident.name, args);
+ single_char_add_str::check(cx, expr, args);
+ into_iter_on_ref::check(cx, expr, method_span, method_call.ident.name, args);
+ single_char_pattern::check(cx, expr, method_call.ident.name, args);
+ unnecessary_to_owned::check(cx, expr, method_call.ident.name, args, self.msrv);
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) if op.node == hir::BinOpKind::Eq || op.node == hir::BinOpKind::Ne => {
+ let mut info = BinaryExprInfo {
+ expr,
+ chain: lhs,
+ other: rhs,
+ eq: op.node == hir::BinOpKind::Eq,
+ };
+ lint_binary_expr_with_method_call(cx, &mut info);
+ },
+ _ => (),
+ }
+ }
+
+ #[allow(clippy::too_many_lines)]
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
+ if in_external_macro(cx.sess(), impl_item.span) {
+ return;
+ }
+ let name = impl_item.ident.name.as_str();
+ let parent = cx.tcx.hir().get_parent_item(impl_item.hir_id());
+ let item = cx.tcx.hir().expect_item(parent);
+ let self_ty = cx.tcx.type_of(item.def_id);
+
+ let implements_trait = matches!(item.kind, hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }));
+ if_chain! {
+ if let hir::ImplItemKind::Fn(ref sig, id) = impl_item.kind;
+ if let Some(first_arg) = iter_input_pats(sig.decl, cx.tcx.hir().body(id)).next();
+
+ let method_sig = cx.tcx.fn_sig(impl_item.def_id);
+ let method_sig = cx.tcx.erase_late_bound_regions(method_sig);
+
+ let first_arg_ty = method_sig.inputs().iter().next();
+
+ // check conventions w.r.t. conversion method names and predicates
+ if let Some(first_arg_ty) = first_arg_ty;
+
+ then {
+ // if this impl block implements a trait, lint in trait definition instead
+ if !implements_trait && cx.access_levels.is_exported(impl_item.def_id) {
+ // check missing trait implementations
+ for method_config in &TRAIT_METHODS {
+ if name == method_config.method_name &&
+ sig.decl.inputs.len() == method_config.param_count &&
+ method_config.output_type.matches(&sig.decl.output) &&
+ method_config.self_kind.matches(cx, self_ty, *first_arg_ty) &&
+ fn_header_equals(method_config.fn_header, sig.header) &&
+ method_config.lifetime_param_cond(impl_item)
+ {
+ span_lint_and_help(
+ cx,
+ SHOULD_IMPLEMENT_TRAIT,
+ impl_item.span,
+ &format!(
+ "method `{}` can be confused for the standard trait method `{}::{}`",
+ method_config.method_name,
+ method_config.trait_name,
+ method_config.method_name
+ ),
+ None,
+ &format!(
+ "consider implementing the trait `{}` or choosing a less ambiguous method name",
+ method_config.trait_name
+ )
+ );
+ }
+ }
+ }
+
+ if sig.decl.implicit_self.has_implicit_self()
+ && !(self.avoid_breaking_exported_api
+ && cx.access_levels.is_exported(impl_item.def_id))
+ {
+ wrong_self_convention::check(
+ cx,
+ name,
+ self_ty,
+ *first_arg_ty,
+ first_arg.pat.span,
+ implements_trait,
+ false
+ );
+ }
+ }
+ }
+
+ // if this impl block implements a trait, lint in trait definition instead
+ if implements_trait {
+ return;
+ }
+
+ if let hir::ImplItemKind::Fn(_, _) = impl_item.kind {
+ let ret_ty = return_ty(cx, impl_item.hir_id());
+
+ // walk the return type and check for Self (this does not check associated types)
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(ret_ty, self_adt) {
+ return;
+ }
+ } else if contains_ty(ret_ty, self_ty) {
+ return;
+ }
+
+ // if return type is impl trait, check the associated types
+ if let ty::Opaque(def_id, _) = *ret_ty.kind() {
+ // one of the associated types must be Self
+ for &(predicate, _span) in cx.tcx.explicit_item_bounds(def_id) {
+ if let ty::PredicateKind::Projection(projection_predicate) = predicate.kind().skip_binder() {
+ let assoc_ty = match projection_predicate.term {
+ ty::Term::Ty(ty) => ty,
+ ty::Term::Const(_c) => continue,
+ };
+ // walk the associated type and check for Self
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(assoc_ty, self_adt) {
+ return;
+ }
+ } else if contains_ty(assoc_ty, self_ty) {
+ return;
+ }
+ }
+ }
+ }
+
+ if name == "new" && ret_ty != self_ty {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ impl_item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if in_external_macro(cx.tcx.sess, item.span) {
+ return;
+ }
+
+ if_chain! {
+ if let TraitItemKind::Fn(ref sig, _) = item.kind;
+ if sig.decl.implicit_self.has_implicit_self();
+ if let Some(first_arg_ty) = sig.decl.inputs.iter().next();
+
+ then {
+ let first_arg_span = first_arg_ty.span;
+ let first_arg_ty = hir_ty_to_ty(cx.tcx, first_arg_ty);
+ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
+ wrong_self_convention::check(
+ cx,
+ item.ident.name.as_str(),
+ self_ty,
+ first_arg_ty,
+ first_arg_span,
+ false,
+ true
+ );
+ }
+ }
+
+ if_chain! {
+ if item.ident.name == sym::new;
+ if let TraitItemKind::Fn(_, _) = item.kind;
+ let ret_ty = return_ty(cx, item.hir_id());
+ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
+ if !contains_ty(ret_ty, self_ty);
+
+ then {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+impl Methods {
+ #[allow(clippy::too_many_lines)]
+ fn check_methods<'tcx>(&self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let Some((name, [recv, args @ ..], span)) = method_call(expr) {
+ match (name, args) {
+ ("add" | "offset" | "sub" | "wrapping_offset" | "wrapping_add" | "wrapping_sub", [_arg]) => {
+ zst_offset::check(cx, expr, recv);
+ },
+ ("and_then", [arg]) => {
+ let biom_option_linted = bind_instead_of_map::OptionAndThenSome::check(cx, expr, recv, arg);
+ let biom_result_linted = bind_instead_of_map::ResultAndThenOk::check(cx, expr, recv, arg);
+ if !biom_option_linted && !biom_result_linted {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "and");
+ }
+ },
+ ("as_deref" | "as_deref_mut", []) => {
+ needless_option_as_deref::check(cx, expr, recv, name);
+ },
+ ("as_mut", []) => useless_asref::check(cx, expr, "as_mut", recv),
+ ("as_ref", []) => useless_asref::check(cx, expr, "as_ref", recv),
+ ("assume_init", []) => uninit_assumed_init::check(cx, expr, recv),
+ ("cloned", []) => cloned_instead_of_copied::check(cx, expr, recv, span, self.msrv),
+ ("collect", []) => match method_call(recv) {
+ Some((name @ ("cloned" | "copied"), [recv2], _)) => {
+ iter_cloned_collect::check(cx, name, expr, recv2);
+ },
+ Some(("map", [m_recv, m_arg], _)) => {
+ map_collect_result_unit::check(cx, expr, m_recv, m_arg, recv);
+ },
+ Some(("take", [take_self_arg, take_arg], _)) => {
+ if meets_msrv(self.msrv, msrvs::STR_REPEAT) {
+ manual_str_repeat::check(cx, expr, recv, take_self_arg, take_arg);
+ }
+ },
+ _ => {},
+ },
+ ("count", []) => match method_call(recv) {
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, true, false),
+ Some((name2 @ ("into_iter" | "iter" | "iter_mut"), [recv2], _)) => {
+ iter_count::check(cx, expr, recv2, name2);
+ },
+ Some(("map", [_, arg], _)) => suspicious_map::check(cx, expr, recv, arg),
+ _ => {},
+ },
+ ("drain", [arg]) => {
+ iter_with_drain::check(cx, expr, recv, span, arg);
+ },
+ ("expect", [_]) => match method_call(recv) {
+ Some(("ok", [recv], _)) => ok_expect::check(cx, expr, recv),
+ Some(("err", [recv], err_span)) => err_expect::check(cx, expr, recv, self.msrv, span, err_span),
+ _ => expect_used::check(cx, expr, recv, self.allow_expect_in_tests),
+ },
+ ("extend", [arg]) => {
+ string_extend_chars::check(cx, expr, recv, arg);
+ extend_with_drain::check(cx, expr, recv, arg);
+ },
+ ("filter_map", [arg]) => {
+ unnecessary_filter_map::check(cx, expr, arg, name);
+ filter_map_identity::check(cx, expr, arg, span);
+ },
+ ("find_map", [arg]) => {
+ unnecessary_filter_map::check(cx, expr, arg, name);
+ },
+ ("flat_map", [arg]) => {
+ flat_map_identity::check(cx, expr, arg, span);
+ flat_map_option::check(cx, expr, arg, span);
+ },
+ ("flatten", []) => match method_call(recv) {
+ Some(("map", [recv, map_arg], map_span)) => map_flatten::check(cx, expr, recv, map_arg, map_span),
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, true),
+ _ => {},
+ },
+ ("fold", [init, acc]) => unnecessary_fold::check(cx, expr, init, acc, span),
+ ("for_each", [_]) => {
+ if let Some(("inspect", [_, _], span2)) = method_call(recv) {
+ inspect_for_each::check(cx, expr, span2);
+ }
+ },
+ ("get", [arg]) => get_last_with_len::check(cx, expr, recv, arg),
+ ("get_or_insert_with", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "get_or_insert"),
+ ("is_file", []) => filetype_is_file::check(cx, expr, recv),
+ ("is_digit", [radix]) => is_digit_ascii_radix::check(cx, expr, recv, radix, self.msrv),
+ ("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
+ ("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
+ ("join", [join_arg]) => {
+ if let Some(("collect", _, span)) = method_call(recv) {
+ unnecessary_join::check(cx, expr, recv, join_arg, span);
+ }
+ },
+ ("last", []) | ("skip", [_]) => {
+ if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv, recv2, false, false);
+ }
+ }
+ },
+ (name @ ("map" | "map_err"), [m_arg]) => {
+ if let Some((name, [recv2, args @ ..], span2)) = method_call(recv) {
+ match (name, args) {
+ ("as_mut", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, true, self.msrv),
+ ("as_ref", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, false, self.msrv),
+ ("filter", [f_arg]) => {
+ filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, false);
+ },
+ ("find", [f_arg]) => {
+ filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, true);
+ },
+ _ => {},
+ }
+ }
+ map_identity::check(cx, expr, recv, m_arg, name, span);
+ },
+ ("map_or", [def, map]) => option_map_or_none::check(cx, expr, recv, def, map),
+ ("next", []) => {
+ if let Some((name2, [recv2, args2 @ ..], _)) = method_call(recv) {
+ match (name2, args2) {
+ ("cloned", []) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, false),
+ ("filter", [arg]) => filter_next::check(cx, expr, recv2, arg),
+ ("filter_map", [arg]) => filter_map_next::check(cx, expr, recv2, arg, self.msrv),
+ ("iter", []) => iter_next_slice::check(cx, expr, recv2),
+ ("skip", [arg]) => iter_skip_next::check(cx, expr, recv2, arg),
+ ("skip_while", [_]) => skip_while_next::check(cx, expr),
+ _ => {},
+ }
+ }
+ },
+ ("nth", [n_arg]) => match method_call(recv) {
+ Some(("bytes", [recv2], _)) => bytes_nth::check(cx, expr, recv2, n_arg),
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv, recv2, false, false),
+ Some(("iter", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, false),
+ Some(("iter_mut", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, true),
+ _ => iter_nth_zero::check(cx, expr, recv, n_arg),
+ },
+ ("ok_or_else", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "ok_or"),
+ ("or_else", [arg]) => {
+ if !bind_instead_of_map::ResultOrElseErrInfo::check(cx, expr, recv, arg) {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "or");
+ }
+ },
+ ("splitn" | "rsplitn", [count_arg, pat_arg]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ str_splitn::check(cx, name, expr, recv, pat_arg, count, self.msrv);
+ }
+ },
+ ("splitn_mut" | "rsplitn_mut", [count_arg, _]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ }
+ },
+ ("step_by", [arg]) => iterator_step_by_zero::check(cx, expr, arg),
+ ("take", [_arg]) => {
+ if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv, recv2, false, false);
+ }
+ }
+ },
+ ("take", []) => needless_option_take::check(cx, expr, recv),
+ ("then", [arg]) => {
+ if !meets_msrv(self.msrv, msrvs::BOOL_THEN_SOME) {
+ return;
+ }
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "then_some");
+ },
+ ("to_os_string" | "to_owned" | "to_path_buf" | "to_vec", []) => {
+ implicit_clone::check(cx, name, expr, recv);
+ },
+ ("unwrap", []) => {
+ match method_call(recv) {
+ Some(("get", [recv, get_arg], _)) => {
+ get_unwrap::check(cx, expr, recv, get_arg, false);
+ },
+ Some(("get_mut", [recv, get_arg], _)) => {
+ get_unwrap::check(cx, expr, recv, get_arg, true);
+ },
+ Some(("or", [recv, or_arg], or_span)) => {
+ or_then_unwrap::check(cx, expr, recv, or_arg, or_span);
+ },
+ _ => {},
+ }
+ unwrap_used::check(cx, expr, recv, self.allow_unwrap_in_tests);
+ },
+ ("unwrap_or", [u_arg]) => match method_call(recv) {
+ Some((arith @ ("checked_add" | "checked_sub" | "checked_mul"), [lhs, rhs], _)) => {
+ manual_saturating_arithmetic::check(cx, expr, lhs, rhs, u_arg, &arith["checked_".len()..]);
+ },
+ Some(("map", [m_recv, m_arg], span)) => {
+ option_map_unwrap_or::check(cx, expr, m_recv, m_arg, recv, u_arg, span);
+ },
++ Some(("then_some", [t_recv, t_arg], _)) => {
++ obfuscated_if_else::check(cx, expr, t_recv, t_arg, u_arg);
++ },
+ _ => {},
+ },
+ ("unwrap_or_else", [u_arg]) => match method_call(recv) {
+ Some(("map", [recv, map_arg], _))
+ if map_unwrap_or::check(cx, expr, recv, map_arg, u_arg, self.msrv) => {},
+ _ => {
+ unwrap_or_else_default::check(cx, expr, recv, u_arg);
+ unnecessary_lazy_eval::check(cx, expr, recv, u_arg, "unwrap_or");
+ },
+ },
+ ("replace" | "replacen", [arg1, arg2] | [arg1, arg2, _]) => {
+ no_effect_replace::check(cx, expr, arg1, arg2);
+ },
+ _ => {},
+ }
+ }
+ }
+}
+
+fn check_is_some_is_none(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, is_some: bool) {
+ if let Some((name @ ("find" | "position" | "rposition"), [f_recv, arg], span)) = method_call(recv) {
+ search_is_some::check(cx, expr, name, is_some, f_recv, arg, recv, span);
+ }
+}
+
+/// Used for `lint_binary_expr_with_method_call`.
+#[derive(Copy, Clone)]
+struct BinaryExprInfo<'a> {
+ expr: &'a hir::Expr<'a>,
+ chain: &'a hir::Expr<'a>,
+ other: &'a hir::Expr<'a>,
+ eq: bool,
+}
+
+/// Checks for the `CHARS_NEXT_CMP` and `CHARS_LAST_CMP` lints.
+fn lint_binary_expr_with_method_call(cx: &LateContext<'_>, info: &mut BinaryExprInfo<'_>) {
+ macro_rules! lint_with_both_lhs_and_rhs {
+ ($func:expr, $cx:expr, $info:ident) => {
+ if !$func($cx, $info) {
+ ::std::mem::swap(&mut $info.chain, &mut $info.other);
+ if $func($cx, $info) {
+ return;
+ }
+ }
+ };
+ }
+
+ lint_with_both_lhs_and_rhs!(chars_next_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_next_cmp_with_unwrap::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp_with_unwrap::check, cx, info);
+}
+
+const FN_HEADER: hir::FnHeader = hir::FnHeader {
+ unsafety: hir::Unsafety::Normal,
+ constness: hir::Constness::NotConst,
+ asyncness: hir::IsAsync::NotAsync,
+ abi: rustc_target::spec::abi::Abi::Rust,
+};
+
+struct ShouldImplTraitCase {
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ // implicit self kind expected (none, self, &self, ...)
+ self_kind: SelfKind,
+ // checks against the output type
+ output_type: OutType,
+ // certain methods with explicit lifetimes can't implement the equivalent trait method
+ lint_explicit_lifetime: bool,
+}
+impl ShouldImplTraitCase {
+ const fn new(
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ self_kind: SelfKind,
+ output_type: OutType,
+ lint_explicit_lifetime: bool,
+ ) -> ShouldImplTraitCase {
+ ShouldImplTraitCase {
+ trait_name,
+ method_name,
+ param_count,
+ fn_header,
+ self_kind,
+ output_type,
+ lint_explicit_lifetime,
+ }
+ }
+
+ fn lifetime_param_cond(&self, impl_item: &hir::ImplItem<'_>) -> bool {
+ self.lint_explicit_lifetime
+ || !impl_item.generics.params.iter().any(|p| {
+ matches!(
+ p.kind,
+ hir::GenericParamKind::Lifetime {
+ kind: hir::LifetimeParamKind::Explicit
+ }
+ )
+ })
+ }
+}
+
+#[rustfmt::skip]
+const TRAIT_METHODS: [ShouldImplTraitCase; 30] = [
+ ShouldImplTraitCase::new("std::ops::Add", "add", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::convert::AsMut", "as_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::convert::AsRef", "as_ref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::BitAnd", "bitand", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitOr", "bitor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitXor", "bitxor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::borrow::Borrow", "borrow", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::borrow::BorrowMut", "borrow_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::clone::Clone", "clone", 1, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ ShouldImplTraitCase::new("std::cmp::Ord", "cmp", 2, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ // FIXME: default doesn't work
+ ShouldImplTraitCase::new("std::default::Default", "default", 0, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Deref", "deref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::DerefMut", "deref_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::Div", "div", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Drop", "drop", 1, FN_HEADER, SelfKind::RefMut, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::cmp::PartialEq", "eq", 2, FN_HEADER, SelfKind::Ref, OutType::Bool, true),
+ ShouldImplTraitCase::new("std::iter::FromIterator", "from_iter", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::str::FromStr", "from_str", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::hash::Hash", "hash", 2, FN_HEADER, SelfKind::Ref, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::ops::Index", "index", 2, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::IndexMut", "index_mut", 2, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::iter::IntoIterator", "into_iter", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Mul", "mul", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Neg", "neg", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::iter::Iterator", "next", 1, FN_HEADER, SelfKind::RefMut, OutType::Any, false),
+ ShouldImplTraitCase::new("std::ops::Not", "not", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Rem", "rem", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shl", "shl", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shr", "shr", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Sub", "sub", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+];
+
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+enum SelfKind {
+ Value,
+ Ref,
+ RefMut,
+ No,
+}
+
+impl SelfKind {
+ fn matches<'a>(self, cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ if ty == parent_ty {
+ true
+ } else if ty.is_box() {
+ ty.boxed_ty() == parent_ty
+ } else if is_type_diagnostic_item(cx, ty, sym::Rc) || is_type_diagnostic_item(cx, ty, sym::Arc) {
+ if let ty::Adt(_, substs) = ty.kind() {
+ substs.types().next().map_or(false, |t| t == parent_ty)
+ } else {
+ false
+ }
+ } else {
+ false
+ }
+ }
+
+ fn matches_ref<'a>(cx: &LateContext<'a>, mutability: hir::Mutability, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ if let ty::Ref(_, t, m) = *ty.kind() {
+ return m == mutability && t == parent_ty;
+ }
+
+ let trait_path = match mutability {
+ hir::Mutability::Not => &paths::ASREF_TRAIT,
+ hir::Mutability::Mut => &paths::ASMUT_TRAIT,
+ };
+
+ let trait_def_id = match get_trait_def_id(cx, trait_path) {
+ Some(did) => did,
+ None => return false,
+ };
+ implements_trait(cx, ty, trait_def_id, &[parent_ty.into()])
+ }
+
+ fn matches_none<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ !matches_value(cx, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Not, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Mut, parent_ty, ty)
+ }
+
+ match self {
+ Self::Value => matches_value(cx, parent_ty, ty),
+ Self::Ref => matches_ref(cx, hir::Mutability::Not, parent_ty, ty) || ty == parent_ty && is_copy(cx, ty),
+ Self::RefMut => matches_ref(cx, hir::Mutability::Mut, parent_ty, ty),
+ Self::No => matches_none(cx, parent_ty, ty),
+ }
+ }
+
+ #[must_use]
+ fn description(self) -> &'static str {
+ match self {
+ Self::Value => "`self` by value",
+ Self::Ref => "`self` by reference",
+ Self::RefMut => "`self` by mutable reference",
+ Self::No => "no `self`",
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+enum OutType {
+ Unit,
+ Bool,
+ Any,
+ Ref,
+}
+
+impl OutType {
+ fn matches(self, ty: &hir::FnRetTy<'_>) -> bool {
+ let is_unit = |ty: &hir::Ty<'_>| matches!(ty.kind, hir::TyKind::Tup(&[]));
+ match (self, ty) {
+ (Self::Unit, &hir::FnRetTy::DefaultReturn(_)) => true,
+ (Self::Unit, &hir::FnRetTy::Return(ty)) if is_unit(ty) => true,
+ (Self::Bool, &hir::FnRetTy::Return(ty)) if is_bool(ty) => true,
+ (Self::Any, &hir::FnRetTy::Return(ty)) if !is_unit(ty) => true,
+ (Self::Ref, &hir::FnRetTy::Return(ty)) => matches!(ty.kind, hir::TyKind::Rptr(_, _)),
+ _ => false,
+ }
+ }
+}
+
+fn is_bool(ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ matches!(path.res, Res::PrimTy(PrimTy::Bool))
+ } else {
+ false
+ }
+}
+
+fn fn_header_equals(expected: hir::FnHeader, actual: hir::FnHeader) -> bool {
+ expected.constness == actual.constness
+ && expected.unsafety == actual.unsafety
+ && expected.asyncness == actual.asyncness
+}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++use super::OBFUSCATED_IF_ELSE;
++use clippy_utils::{diagnostics::span_lint_and_sugg, source::snippet_with_applicability};
++use rustc_errors::Applicability;
++use rustc_hir as hir;
++use rustc_lint::LateContext;
++
++pub(super) fn check<'tcx>(
++ cx: &LateContext<'tcx>,
++ expr: &'tcx hir::Expr<'_>,
++ then_recv: &'tcx hir::Expr<'_>,
++ then_arg: &'tcx hir::Expr<'_>,
++ unwrap_arg: &'tcx hir::Expr<'_>,
++) {
++ // something.then_some(blah).unwrap_or(blah)
++ // ^^^^^^^^^-then_recv ^^^^-then_arg ^^^^- unwrap_arg
++ // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- expr
++
++ let recv_ty = cx.typeck_results().expr_ty(then_recv);
++
++ if recv_ty.is_bool() {
++ let mut applicability = Applicability::MachineApplicable;
++ let sugg = format!(
++ "if {} {{ {} }} else {{ {} }}",
++ snippet_with_applicability(cx, then_recv.span, "..", &mut applicability),
++ snippet_with_applicability(cx, then_arg.span, "..", &mut applicability),
++ snippet_with_applicability(cx, unwrap_arg.span, "..", &mut applicability)
++ );
++
++ span_lint_and_sugg(
++ cx,
++ OBFUSCATED_IF_ELSE,
++ expr.span,
++ "use of `.then_some(..).unwrap_or(..)` can be written \
++ more clearly with `if .. else ..`",
++ "try",
++ sugg,
++ applicability,
++ );
++ }
++}
--- /dev/null
- let impl_params = generic_args.args.iter()
- .filter_map(|p|
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::{GenericArg, Item, ItemKind, QPath, Ty, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::GenericParamDefKind;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for type parameters which are positioned inconsistently between
+ /// a type definition and impl block. Specifically, a parameter in an impl
+ /// block which has the same name as a parameter in the type def, but is in
+ /// a different place.
+ ///
+ /// ### Why is this bad?
+ /// Type parameters are determined by their position rather than name.
+ /// Naming type parameters inconsistently may cause you to refer to the
+ /// wrong type parameter.
+ ///
++ /// ### Limitations
++ /// This lint only applies to impl blocks with simple generic params, e.g.
++ /// `A`. If there is anything more complicated, such as a tuple, it will be
++ /// ignored.
++ ///
+ /// ### Example
+ /// ```rust
+ /// struct Foo<A, B> {
+ /// x: A,
+ /// y: B,
+ /// }
+ /// // inside the impl, B refers to Foo::A
+ /// impl<B, A> Foo<B, A> {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct Foo<A, B> {
+ /// x: A,
+ /// y: B,
+ /// }
+ /// impl<A, B> Foo<A, B> {}
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub MISMATCHING_TYPE_PARAM_ORDER,
+ pedantic,
+ "type parameter positioned inconsistently between type def and impl block"
+}
+declare_lint_pass!(TypeParamMismatch => [MISMATCHING_TYPE_PARAM_ORDER]);
+
+impl<'tcx> LateLintPass<'tcx> for TypeParamMismatch {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
+ if_chain! {
+ if !item.span.from_expansion();
+ if let ItemKind::Impl(imp) = &item.kind;
+ if let TyKind::Path(QPath::Resolved(_, path)) = &imp.self_ty.kind;
+ if let Some(segment) = path.segments.iter().next();
+ if let Some(generic_args) = segment.args;
+ if !generic_args.args.is_empty();
+ then {
+ // get the name and span of the generic parameters in the Impl
- Some((path.segments[0].ident.to_string(), path.span)),
- _ => None,
- }
- );
++ let mut impl_params = Vec::new();
++ for p in generic_args.args.iter() {
+ match p {
+ GenericArg::Type(Ty {kind: TyKind::Path(QPath::Resolved(_, path)), ..}) =>
- for (i, (impl_param_name, impl_param_span)) in impl_params.enumerate() {
- if mismatch_param_name(i, &impl_param_name, &type_param_names_hashmap) {
++ impl_params.push((path.segments[0].ident.to_string(), path.span)),
++ GenericArg::Type(_) => return,
++ _ => (),
++ };
++ }
+
+ // find the type that the Impl is for
+ // only lint on struct/enum/union for now
+ let defid = match path.res {
+ Res::Def(DefKind::Struct | DefKind::Enum | DefKind::Union, defid) => defid,
+ _ => return,
+ };
+
+ // get the names of the generic parameters in the type
+ let type_params = &cx.tcx.generics_of(defid).params;
+ let type_param_names: Vec<_> = type_params.iter()
+ .filter_map(|p|
+ match p.kind {
+ GenericParamDefKind::Type {..} => Some(p.name.to_string()),
+ _ => None,
+ }
+ ).collect();
+ // hashmap of name -> index for mismatch_param_name
+ let type_param_names_hashmap: FxHashMap<&String, usize> =
+ type_param_names.iter().enumerate().map(|(i, param)| (param, i)).collect();
+
+ let type_name = segment.ident;
- impl_param_span,
++ for (i, (impl_param_name, impl_param_span)) in impl_params.iter().enumerate() {
++ if mismatch_param_name(i, impl_param_name, &type_param_names_hashmap) {
+ let msg = format!("`{}` has a similarly named generic type parameter `{}` in its declaration, but in a different order",
+ type_name, impl_param_name);
+ let help = format!("try `{}`, or a name that does not conflict with `{}`'s generic params",
+ type_param_names[i], type_name);
+ span_lint_and_help(
+ cx,
+ MISMATCHING_TYPE_PARAM_ORDER,
++ *impl_param_span,
+ &msg,
+ None,
+ &help
+ );
+ }
+ }
+ }
+ }
+ }
+}
+
+// Checks if impl_param_name is the same as one of type_param_names,
+// and is in a different position
+fn mismatch_param_name(i: usize, impl_param_name: &String, type_param_names: &FxHashMap<&String, usize>) -> bool {
+ if let Some(j) = type_param_names.get(impl_param_name) {
+ if i != *j {
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
- if !macro_backtrace(it.span).last().map_or(false, |macro_call| {
- matches!(
- cx.tcx.get_diagnostic_name(macro_call.def_id),
- Some(sym::thread_local_macro)
- )
- }) && is_unfrozen(cx, ty)
- && is_value_unfrozen_poly(cx, body_id, ty)
- {
+//! Checks for uses of const which the type is not `Freeze` (`Cell`-free).
+//!
+//! This lint is **warn** by default.
+
+use std::ptr;
+
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::in_constant;
+use clippy_utils::macros::macro_backtrace;
+use if_chain::if_chain;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::{
+ BodyId, Expr, ExprKind, HirId, Impl, ImplItem, ImplItemKind, Item, ItemKind, Node, TraitItem, TraitItemKind, UnOp,
+};
+use rustc_lint::{LateContext, LateLintPass, Lint};
+use rustc_middle::mir;
+use rustc_middle::mir::interpret::{ConstValue, ErrorHandled};
+use rustc_middle::ty::adjustment::Adjust;
+use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{sym, InnerSpan, Span, DUMMY_SP};
+use rustc_typeck::hir_ty_to_ty;
+
+// FIXME: this is a correctness problem but there's no suitable
+// warn-by-default category.
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for declaration of `const` items which is interior
+ /// mutable (e.g., contains a `Cell`, `Mutex`, `AtomicXxxx`, etc.).
+ ///
+ /// ### Why is this bad?
+ /// Consts are copied everywhere they are referenced, i.e.,
+ /// every time you refer to the const a fresh instance of the `Cell` or `Mutex`
+ /// or `AtomicXxxx` will be created, which defeats the whole purpose of using
+ /// these types in the first place.
+ ///
+ /// The `const` should better be replaced by a `static` item if a global
+ /// variable is wanted, or replaced by a `const fn` if a constructor is wanted.
+ ///
+ /// ### Known problems
+ /// A "non-constant" const item is a legacy way to supply an
+ /// initialized value to downstream `static` items (e.g., the
+ /// `std::sync::ONCE_INIT` constant). In this case the use of `const` is legit,
+ /// and this lint should be suppressed.
+ ///
+ /// Even though the lint avoids triggering on a constant whose type has enums that have variants
+ /// with interior mutability, and its value uses non interior mutable variants (see
+ /// [#3962](https://github.com/rust-lang/rust-clippy/issues/3962) and
+ /// [#3825](https://github.com/rust-lang/rust-clippy/issues/3825) for examples);
+ /// it complains about associated constants without default values only based on its types;
+ /// which might not be preferable.
+ /// There're other enums plus associated constants cases that the lint cannot handle.
+ ///
+ /// Types that have underlying or potential interior mutability trigger the lint whether
+ /// the interior mutable field is used or not. See issues
+ /// [#5812](https://github.com/rust-lang/rust-clippy/issues/5812) and
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ ///
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ /// CONST_ATOM.store(6, SeqCst); // the content of the atomic is unchanged
+ /// assert_eq!(CONST_ATOM.load(SeqCst), 12); // because the CONST_ATOM in these lines are distinct
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// static STATIC_ATOM: AtomicUsize = AtomicUsize::new(15);
+ /// STATIC_ATOM.store(9, SeqCst);
+ /// assert_eq!(STATIC_ATOM.load(SeqCst), 9); // use a `static` item to refer to the same instance
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DECLARE_INTERIOR_MUTABLE_CONST,
+ style,
+ "declaring `const` with interior mutability"
+}
+
+// FIXME: this is a correctness problem but there's no suitable
+// warn-by-default category.
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks if `const` items which is interior mutable (e.g.,
+ /// contains a `Cell`, `Mutex`, `AtomicXxxx`, etc.) has been borrowed directly.
+ ///
+ /// ### Why is this bad?
+ /// Consts are copied everywhere they are referenced, i.e.,
+ /// every time you refer to the const a fresh instance of the `Cell` or `Mutex`
+ /// or `AtomicXxxx` will be created, which defeats the whole purpose of using
+ /// these types in the first place.
+ ///
+ /// The `const` value should be stored inside a `static` item.
+ ///
+ /// ### Known problems
+ /// When an enum has variants with interior mutability, use of its non
+ /// interior mutable variants can generate false positives. See issue
+ /// [#3962](https://github.com/rust-lang/rust-clippy/issues/3962)
+ ///
+ /// Types that have underlying or potential interior mutability trigger the lint whether
+ /// the interior mutable field is used or not. See issues
+ /// [#5812](https://github.com/rust-lang/rust-clippy/issues/5812) and
+ /// [#3825](https://github.com/rust-lang/rust-clippy/issues/3825)
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ ///
+ /// CONST_ATOM.store(6, SeqCst); // the content of the atomic is unchanged
+ /// assert_eq!(CONST_ATOM.load(SeqCst), 12); // because the CONST_ATOM in these lines are distinct
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+ /// const CONST_ATOM: AtomicUsize = AtomicUsize::new(12);
+ ///
+ /// static STATIC_ATOM: AtomicUsize = CONST_ATOM;
+ /// STATIC_ATOM.store(9, SeqCst);
+ /// assert_eq!(STATIC_ATOM.load(SeqCst), 9); // use a `static` item to refer to the same instance
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub BORROW_INTERIOR_MUTABLE_CONST,
+ style,
+ "referencing `const` with interior mutability"
+}
+
+fn is_unfrozen<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ // Ignore types whose layout is unknown since `is_freeze` reports every generic types as `!Freeze`,
+ // making it indistinguishable from `UnsafeCell`. i.e. it isn't a tool to prove a type is
+ // 'unfrozen'. However, this code causes a false negative in which
+ // a type contains a layout-unknown type, but also an unsafe cell like `const CELL: Cell<T>`.
+ // Yet, it's better than `ty.has_type_flags(TypeFlags::HAS_TY_PARAM | TypeFlags::HAS_PROJECTION)`
+ // since it works when a pointer indirection involves (`Cell<*const T>`).
+ // Making up a `ParamEnv` where every generic params and assoc types are `Freeze`is another option;
+ // but I'm not sure whether it's a decent way, if possible.
+ cx.tcx.layout_of(cx.param_env.and(ty)).is_ok() && !ty.is_freeze(cx.tcx.at(DUMMY_SP), cx.param_env)
+}
+
+fn is_value_unfrozen_raw<'tcx>(
+ cx: &LateContext<'tcx>,
+ result: Result<ConstValue<'tcx>, ErrorHandled>,
+ ty: Ty<'tcx>,
+) -> bool {
+ fn inner<'tcx>(cx: &LateContext<'tcx>, val: mir::ConstantKind<'tcx>) -> bool {
+ match val.ty().kind() {
+ // the fact that we have to dig into every structs to search enums
+ // leads us to the point checking `UnsafeCell` directly is the only option.
+ ty::Adt(ty_def, ..) if ty_def.is_unsafe_cell() => true,
+ ty::Array(..) | ty::Adt(..) | ty::Tuple(..) => {
+ let val = cx.tcx.destructure_mir_constant(cx.param_env, val);
+ val.fields.iter().any(|field| inner(cx, *field))
+ },
+ _ => false,
+ }
+ }
+ result.map_or_else(
+ |err| {
+ // Consider `TooGeneric` cases as being unfrozen.
+ // This causes a false positive where an assoc const whose type is unfrozen
+ // have a value that is a frozen variant with a generic param (an example is
+ // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::GENERIC_VARIANT`).
+ // However, it prevents a number of false negatives that is, I think, important:
+ // 1. assoc consts in trait defs referring to consts of themselves
+ // (an example is `declare_interior_mutable_const::traits::ConcreteTypes::ANOTHER_ATOMIC`).
+ // 2. a path expr referring to assoc consts whose type is doesn't have
+ // any frozen variants in trait defs (i.e. without substitute for `Self`).
+ // (e.g. borrowing `borrow_interior_mutable_const::trait::ConcreteTypes::ATOMIC`)
+ // 3. similar to the false positive above;
+ // but the value is an unfrozen variant, or the type has no enums. (An example is
+ // `declare_interior_mutable_const::enums::BothOfCellAndGeneric::UNFROZEN_VARIANT`
+ // and `declare_interior_mutable_const::enums::BothOfCellAndGeneric::NO_ENUM`).
+ // One might be able to prevent these FNs correctly, and replace this with `false`;
+ // e.g. implementing `has_frozen_variant` described above, and not running this function
+ // when the type doesn't have any frozen variants would be the 'correct' way for the 2nd
+ // case (that actually removes another suboptimal behavior (I won't say 'false positive') where,
+ // similar to 2., but with the a frozen variant) (e.g. borrowing
+ // `borrow_interior_mutable_const::enums::AssocConsts::TO_BE_FROZEN_VARIANT`).
+ // I chose this way because unfrozen enums as assoc consts are rare (or, hopefully, none).
+ err == ErrorHandled::TooGeneric
+ },
+ |val| inner(cx, mir::ConstantKind::from_value(val, ty)),
+ )
+}
+
+fn is_value_unfrozen_poly<'tcx>(cx: &LateContext<'tcx>, body_id: BodyId, ty: Ty<'tcx>) -> bool {
+ let result = cx.tcx.const_eval_poly(body_id.hir_id.owner.to_def_id());
+ is_value_unfrozen_raw(cx, result, ty)
+}
+
+fn is_value_unfrozen_expr<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId, def_id: DefId, ty: Ty<'tcx>) -> bool {
+ let substs = cx.typeck_results().node_substs(hir_id);
+
+ let result = cx.tcx.const_eval_resolve(
+ cx.param_env,
+ ty::Unevaluated::new(ty::WithOptConstParam::unknown(def_id), substs),
+ None,
+ );
+ is_value_unfrozen_raw(cx, result, ty)
+}
+
+#[derive(Copy, Clone)]
+enum Source {
+ Item { item: Span },
+ Assoc { item: Span },
+ Expr { expr: Span },
+}
+
+impl Source {
+ #[must_use]
+ fn lint(&self) -> (&'static Lint, &'static str, Span) {
+ match self {
+ Self::Item { item } | Self::Assoc { item, .. } => (
+ DECLARE_INTERIOR_MUTABLE_CONST,
+ "a `const` item should never be interior mutable",
+ *item,
+ ),
+ Self::Expr { expr } => (
+ BORROW_INTERIOR_MUTABLE_CONST,
+ "a `const` item with interior mutability should not be borrowed",
+ *expr,
+ ),
+ }
+ }
+}
+
+fn lint(cx: &LateContext<'_>, source: Source) {
+ let (lint, msg, span) = source.lint();
+ span_lint_and_then(cx, lint, span, msg, |diag| {
+ if span.from_expansion() {
+ return; // Don't give suggestions into macros.
+ }
+ match source {
+ Source::Item { .. } => {
+ let const_kw_span = span.from_inner(InnerSpan::new(0, 5));
+ diag.span_label(const_kw_span, "make this a static item (maybe with lazy_static)");
+ },
+ Source::Assoc { .. } => (),
+ Source::Expr { .. } => {
+ diag.help("assign this const to a local or static variable, and use the variable here");
+ },
+ }
+ });
+}
+
+declare_lint_pass!(NonCopyConst => [DECLARE_INTERIOR_MUTABLE_CONST, BORROW_INTERIOR_MUTABLE_CONST]);
+
+impl<'tcx> LateLintPass<'tcx> for NonCopyConst {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx Item<'_>) {
+ if let ItemKind::Const(hir_ty, body_id) = it.kind {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
++ if !ignored_macro(cx, it) && is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, body_id, ty) {
+ lint(cx, Source::Item { item: it.span });
+ }
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, trait_item: &'tcx TraitItem<'_>) {
+ if let TraitItemKind::Const(hir_ty, body_id_opt) = &trait_item.kind {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+
+ // Normalize assoc types because ones originated from generic params
+ // bounded other traits could have their bound.
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+ if is_unfrozen(cx, normalized)
+ // When there's no default value, lint it only according to its type;
+ // in other words, lint consts whose value *could* be unfrozen, not definitely is.
+ // This feels inconsistent with how the lint treats generic types,
+ // which avoids linting types which potentially become unfrozen.
+ // One could check whether an unfrozen type have a *frozen variant*
+ // (like `body_id_opt.map_or_else(|| !has_frozen_variant(...), ...)`),
+ // and do the same as the case of generic types at impl items.
+ // Note that it isn't sufficient to check if it has an enum
+ // since all of that enum's variants can be unfrozen:
+ // i.e. having an enum doesn't necessary mean a type has a frozen variant.
+ // And, implementing it isn't a trivial task; it'll probably end up
+ // re-implementing the trait predicate evaluation specific to `Freeze`.
+ && body_id_opt.map_or(true, |body_id| is_value_unfrozen_poly(cx, body_id, normalized))
+ {
+ lint(cx, Source::Assoc { item: trait_item.span });
+ }
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx ImplItem<'_>) {
+ if let ImplItemKind::Const(hir_ty, body_id) = &impl_item.kind {
+ let item_def_id = cx.tcx.hir().get_parent_item(impl_item.hir_id());
+ let item = cx.tcx.hir().expect_item(item_def_id);
+
+ match &item.kind {
+ ItemKind::Impl(Impl {
+ of_trait: Some(of_trait_ref),
+ ..
+ }) => {
+ if_chain! {
+ // Lint a trait impl item only when the definition is a generic type,
+ // assuming an assoc const is not meant to be an interior mutable type.
+ if let Some(of_trait_def_id) = of_trait_ref.trait_def_id();
+ if let Some(of_assoc_item) = cx
+ .tcx
+ .associated_item(impl_item.def_id)
+ .trait_item_def_id;
+ if cx
+ .tcx
+ .layout_of(cx.tcx.param_env(of_trait_def_id).and(
+ // Normalize assoc types because ones originated from generic params
+ // bounded other traits could have their bound at the trait defs;
+ // and, in that case, the definition is *not* generic.
+ cx.tcx.normalize_erasing_regions(
+ cx.tcx.param_env(of_trait_def_id),
+ cx.tcx.type_of(of_assoc_item),
+ ),
+ ))
+ .is_err();
+ // If there were a function like `has_frozen_variant` described above,
+ // we should use here as a frozen variant is a potential to be frozen
+ // similar to unknown layouts.
+ // e.g. `layout_of(...).is_err() || has_frozen_variant(...);`
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+ if is_unfrozen(cx, normalized);
+ if is_value_unfrozen_poly(cx, *body_id, normalized);
+ then {
+ lint(
+ cx,
+ Source::Assoc {
+ item: impl_item.span,
+ },
+ );
+ }
+ }
+ },
+ ItemKind::Impl(Impl { of_trait: None, .. }) => {
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ // Normalize assoc types originated from generic params.
+ let normalized = cx.tcx.normalize_erasing_regions(cx.param_env, ty);
+
+ if is_unfrozen(cx, ty) && is_value_unfrozen_poly(cx, *body_id, normalized) {
+ lint(cx, Source::Assoc { item: impl_item.span });
+ }
+ },
+ _ => (),
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Path(qpath) = &expr.kind {
+ // Only lint if we use the const item inside a function.
+ if in_constant(cx, expr.hir_id) {
+ return;
+ }
+
+ // Make sure it is a const item.
+ let item_def_id = match cx.qpath_res(qpath, expr.hir_id) {
+ Res::Def(DefKind::Const | DefKind::AssocConst, did) => did,
+ _ => return,
+ };
+
+ // Climb up to resolve any field access and explicit referencing.
+ let mut cur_expr = expr;
+ let mut dereferenced_expr = expr;
+ let mut needs_check_adjustment = true;
+ loop {
+ let parent_id = cx.tcx.hir().get_parent_node(cur_expr.hir_id);
+ if parent_id == cur_expr.hir_id {
+ break;
+ }
+ if let Some(Node::Expr(parent_expr)) = cx.tcx.hir().find(parent_id) {
+ match &parent_expr.kind {
+ ExprKind::AddrOf(..) => {
+ // `&e` => `e` must be referenced.
+ needs_check_adjustment = false;
+ },
+ ExprKind::Field(..) => {
+ needs_check_adjustment = true;
+
+ // Check whether implicit dereferences happened;
+ // if so, no need to go further up
+ // because of the same reason as the `ExprKind::Unary` case.
+ if cx
+ .typeck_results()
+ .expr_adjustments(dereferenced_expr)
+ .iter()
+ .any(|adj| matches!(adj.kind, Adjust::Deref(_)))
+ {
+ break;
+ }
+
+ dereferenced_expr = parent_expr;
+ },
+ ExprKind::Index(e, _) if ptr::eq(&**e, cur_expr) => {
+ // `e[i]` => desugared to `*Index::index(&e, i)`,
+ // meaning `e` must be referenced.
+ // no need to go further up since a method call is involved now.
+ needs_check_adjustment = false;
+ break;
+ },
+ ExprKind::Unary(UnOp::Deref, _) => {
+ // `*e` => desugared to `*Deref::deref(&e)`,
+ // meaning `e` must be referenced.
+ // no need to go further up since a method call is involved now.
+ needs_check_adjustment = false;
+ break;
+ },
+ _ => break,
+ }
+ cur_expr = parent_expr;
+ } else {
+ break;
+ }
+ }
+
+ let ty = if needs_check_adjustment {
+ let adjustments = cx.typeck_results().expr_adjustments(dereferenced_expr);
+ if let Some(i) = adjustments
+ .iter()
+ .position(|adj| matches!(adj.kind, Adjust::Borrow(_) | Adjust::Deref(_)))
+ {
+ if i == 0 {
+ cx.typeck_results().expr_ty(dereferenced_expr)
+ } else {
+ adjustments[i - 1].target
+ }
+ } else {
+ // No borrow adjustments means the entire const is moved.
+ return;
+ }
+ } else {
+ cx.typeck_results().expr_ty(dereferenced_expr)
+ };
+
+ if is_unfrozen(cx, ty) && is_value_unfrozen_expr(cx, expr.hir_id, item_def_id, ty) {
+ lint(cx, Source::Expr { expr: expr.span });
+ }
+ }
+ }
+}
++
++fn ignored_macro(cx: &LateContext<'_>, it: &rustc_hir::Item<'_>) -> bool {
++ macro_backtrace(it.span).any(|macro_call| {
++ matches!(
++ cx.tcx.get_diagnostic_name(macro_call.def_id),
++ Some(sym::thread_local_macro)
++ )
++ })
++}
--- /dev/null
--- /dev/null
++#![allow(
++ // False positive
++ clippy::match_same_arms
++)]
++
++use super::ARITHMETIC;
++use clippy_utils::{consts::constant_simple, diagnostics::span_lint};
++use rustc_data_structures::fx::FxHashSet;
++use rustc_hir as hir;
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::impl_lint_pass;
++use rustc_span::source_map::Span;
++
++const HARD_CODED_ALLOWED: &[&str] = &["std::num::Saturating", "std::string::String", "std::num::Wrapping"];
++
++#[derive(Debug)]
++pub struct Arithmetic {
++ allowed: 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!(Arithmetic => [ARITHMETIC]);
++
++impl Arithmetic {
++ #[must_use]
++ pub fn new(mut allowed: FxHashSet<String>) -> Self {
++ allowed.extend(HARD_CODED_ALLOWED.iter().copied().map(String::from));
++ Self {
++ allowed,
++ const_span: None,
++ expr_span: None,
++ }
++ }
++
++ /// Checks if the given `expr` has any of the inner `allowed` elements.
++ fn is_allowed_ty(&self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
++ self.allowed.contains(
++ cx.typeck_results()
++ .expr_ty(expr)
++ .to_string()
++ .split('<')
++ .next()
++ .unwrap_or_default(),
++ )
++ }
++
++ fn issue_lint(&mut self, cx: &LateContext<'_>, expr: &hir::Expr<'_>) {
++ span_lint(cx, ARITHMETIC, expr.span, "arithmetic detected");
++ self.expr_span = Some(expr.span);
++ }
++}
++
++impl<'tcx> LateLintPass<'tcx> for Arithmetic {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ if self.expr_span.is_some() {
++ return;
++ }
++ if let Some(span) = self.const_span && span.contains(expr.span) {
++ return;
++ }
++ match &expr.kind {
++ hir::ExprKind::Binary(op, lhs, rhs) | hir::ExprKind::AssignOp(op, lhs, rhs) => {
++ let (
++ hir::BinOpKind::Add
++ | hir::BinOpKind::Sub
++ | hir::BinOpKind::Mul
++ | hir::BinOpKind::Div
++ | hir::BinOpKind::Rem
++ | hir::BinOpKind::Shl
++ | hir::BinOpKind::Shr
++ ) = op.node else {
++ return;
++ };
++ if self.is_allowed_ty(cx, lhs) || self.is_allowed_ty(cx, rhs) {
++ return;
++ }
++ self.issue_lint(cx, expr);
++ },
++ hir::ExprKind::Unary(hir::UnOp::Neg, _) => {
++ // CTFE already takes care of things like `-1` that do not overflow.
++ if constant_simple(cx, cx.typeck_results(), expr).is_none() {
++ self.issue_lint(cx, expr);
++ }
++ },
++ _ => {},
++ }
++ }
++
++ fn check_body(&mut self, cx: &LateContext<'_>, body: &hir::Body<'_>) {
++ let body_owner = cx.tcx.hir().body_owner_def_id(body.id());
++ match cx.tcx.hir().body_owner_kind(body_owner) {
++ hir::BodyOwnerKind::Const | hir::BodyOwnerKind::Static(_) => {
++ let body_span = cx.tcx.def_span(body_owner);
++ if let Some(span) = self.const_span && span.contains(body_span) {
++ return;
++ }
++ self.const_span = Some(body_span);
++ },
++ hir::BodyOwnerKind::Closure | hir::BodyOwnerKind::Fn => {},
++ }
++ }
++
++ fn check_body_post(&mut self, cx: &LateContext<'_>, body: &hir::Body<'_>) {
++ let body_owner = cx.tcx.hir().body_owner(body.id());
++ let body_span = cx.tcx.hir().span(body_owner);
++ if let Some(span) = self.const_span && span.contains(body_span) {
++ return;
++ }
++ self.const_span = None;
++ }
++
++ fn check_expr_post(&mut self, _: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
++ if Some(expr.span) == self.expr_span {
++ self.expr_span = None;
++ }
++ }
++}
--- /dev/null
+use clippy_utils::binop_traits;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::implements_trait;
+use clippy_utils::{eq_expr_value, trait_ref_of_method};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_lint::LateContext;
++use rustc_middle::mir::FakeReadCause;
++use rustc_middle::ty::BorrowKind;
++use rustc_trait_selection::infer::TyCtxtInferExt;
++use rustc_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
+
+use super::ASSIGN_OP_PATTERN;
+
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx hir::Expr<'_>,
+ assignee: &'tcx hir::Expr<'_>,
+ e: &'tcx hir::Expr<'_>,
+) {
+ if let hir::ExprKind::Binary(op, l, r) = &e.kind {
+ let lint = |assignee: &hir::Expr<'_>, rhs: &hir::Expr<'_>| {
+ let ty = cx.typeck_results().expr_ty(assignee);
+ let rty = cx.typeck_results().expr_ty(rhs);
+ if_chain! {
+ if let Some((_, lang_item)) = binop_traits(op.node);
+ if let Ok(trait_id) = cx.tcx.lang_items().require(lang_item);
+ let parent_fn = cx.tcx.hir().get_parent_item(e.hir_id);
+ if trait_ref_of_method(cx, parent_fn)
+ .map_or(true, |t| t.path.res.def_id() != trait_id);
+ if implements_trait(cx, ty, trait_id, &[rty.into()]);
+ then {
++ // Primitive types execute assign-ops right-to-left. Every other type is left-to-right.
++ if !(ty.is_primitive() && rty.is_primitive()) {
++ // TODO: This will have false negatives as it doesn't check if the borrows are
++ // actually live at the end of their respective expressions.
++ let mut_borrows = mut_borrows_in_expr(cx, assignee);
++ let imm_borrows = imm_borrows_in_expr(cx, rhs);
++ if mut_borrows.iter().any(|id| imm_borrows.contains(id)) {
++ return;
++ }
++ }
+ span_lint_and_then(
+ cx,
+ ASSIGN_OP_PATTERN,
+ expr.span,
+ "manual implementation of an assign operation",
+ |diag| {
+ if let (Some(snip_a), Some(snip_r)) =
+ (snippet_opt(cx, assignee.span), snippet_opt(cx, rhs.span))
+ {
+ diag.span_suggestion(
+ expr.span,
+ "replace it with",
+ format!("{} {}= {}", snip_a, op.node.as_str(), snip_r),
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ );
+ }
+ }
+ };
+
+ let mut visitor = ExprVisitor {
+ assignee,
+ counter: 0,
+ cx,
+ };
+
+ walk_expr(&mut visitor, e);
+
+ if visitor.counter == 1 {
+ // a = a op b
+ if eq_expr_value(cx, assignee, l) {
+ lint(assignee, r);
+ }
+ // a = b commutative_op a
+ // Limited to primitive type as these ops are know to be commutative
+ if eq_expr_value(cx, assignee, r) && cx.typeck_results().expr_ty(assignee).is_primitive_ty() {
+ match op.node {
+ hir::BinOpKind::Add
+ | hir::BinOpKind::Mul
+ | hir::BinOpKind::And
+ | hir::BinOpKind::Or
+ | hir::BinOpKind::BitXor
+ | hir::BinOpKind::BitAnd
+ | hir::BinOpKind::BitOr => {
+ lint(assignee, l);
+ },
+ _ => {},
+ }
+ }
+ }
+ }
+}
+
+struct ExprVisitor<'a, 'tcx> {
+ assignee: &'a hir::Expr<'a>,
+ counter: u8,
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for ExprVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx hir::Expr<'_>) {
+ if eq_expr_value(self.cx, self.assignee, expr) {
+ self.counter += 1;
+ }
+
+ walk_expr(self, expr);
+ }
+}
++
++fn imm_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> hir::HirIdSet {
++ struct S(hir::HirIdSet);
++ impl Delegate<'_> for S {
++ fn borrow(&mut self, place: &PlaceWithHirId<'_>, _: hir::HirId, kind: BorrowKind) {
++ if matches!(kind, BorrowKind::ImmBorrow | BorrowKind::UniqueImmBorrow) {
++ self.0.insert(match place.place.base {
++ PlaceBase::Local(id) => id,
++ PlaceBase::Upvar(id) => id.var_path.hir_id,
++ _ => return,
++ });
++ }
++ }
++
++ fn consume(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ fn mutate(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ fn fake_read(&mut self, _: &PlaceWithHirId<'_>, _: FakeReadCause, _: hir::HirId) {}
++ fn copy(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ }
++
++ let mut s = S(hir::HirIdSet::default());
++ cx.tcx.infer_ctxt().enter(|infcx| {
++ let mut v = ExprUseVisitor::new(
++ &mut s,
++ &infcx,
++ cx.tcx.hir().body_owner_def_id(cx.enclosing_body.unwrap()),
++ cx.param_env,
++ cx.typeck_results(),
++ );
++ v.consume_expr(e);
++ });
++ s.0
++}
++
++fn mut_borrows_in_expr(cx: &LateContext<'_>, e: &hir::Expr<'_>) -> hir::HirIdSet {
++ struct S(hir::HirIdSet);
++ impl Delegate<'_> for S {
++ fn borrow(&mut self, place: &PlaceWithHirId<'_>, _: hir::HirId, kind: BorrowKind) {
++ if matches!(kind, BorrowKind::MutBorrow) {
++ self.0.insert(match place.place.base {
++ PlaceBase::Local(id) => id,
++ PlaceBase::Upvar(id) => id.var_path.hir_id,
++ _ => return,
++ });
++ }
++ }
++
++ fn consume(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ fn mutate(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ fn fake_read(&mut self, _: &PlaceWithHirId<'_>, _: FakeReadCause, _: hir::HirId) {}
++ fn copy(&mut self, _: &PlaceWithHirId<'_>, _: hir::HirId) {}
++ }
++
++ let mut s = S(hir::HirIdSet::default());
++ cx.tcx.infer_ctxt().enter(|infcx| {
++ let mut v = ExprUseVisitor::new(
++ &mut s,
++ &infcx,
++ cx.tcx.hir().body_owner_def_id(cx.enclosing_body.unwrap()),
++ cx.param_env,
++ cx.typeck_results(),
++ );
++ v.consume_expr(e);
++ });
++ s.0
++}
--- /dev/null
- use rustc_hir::{Body, Expr, ExprKind, UnOp};
- use rustc_lint::{LateContext, LateLintPass};
- use rustc_session::{declare_tool_lint, impl_lint_pass};
-
+mod absurd_extreme_comparisons;
+mod assign_op_pattern;
+mod bit_mask;
+mod cmp_nan;
+mod cmp_owned;
+mod double_comparison;
+mod duration_subsec;
+mod eq_op;
+mod erasing_op;
+mod float_cmp;
+mod float_equality_without_abs;
+mod identity_op;
+mod integer_division;
+mod misrefactored_assign_op;
+mod modulo_arithmetic;
+mod modulo_one;
+mod needless_bitwise_bool;
+mod numeric_arithmetic;
+mod op_ref;
+mod ptr_eq;
+mod self_assignment;
+mod verbose_bit_mask;
+
++pub(crate) mod arithmetic;
++
++use rustc_hir::{Body, Expr, ExprKind, UnOp};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons where one side of the relation is
+ /// either the minimum or maximum value for its type and warns if it involves a
+ /// case that is always true or always false. Only integer and boolean types are
+ /// checked.
+ ///
+ /// ### Why is this bad?
+ /// An expression like `min <= x` may misleadingly imply
+ /// that it is possible for `x` to be less than the minimum. Expressions like
+ /// `max < x` are probably mistakes.
+ ///
+ /// ### Known problems
+ /// For `usize` the size of the current compile target will
+ /// be assumed (e.g., 64 bits on 64 bit systems). This means code that uses such
+ /// a comparison to detect target pointer width will trigger this lint. One can
+ /// use `mem::sizeof` and compare its value or conditional compilation
+ /// attributes
+ /// like `#[cfg(target_pointer_width = "64")] ..` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec: Vec<isize> = Vec::new();
+ /// if vec.len() <= 0 {}
+ /// if 100 > i32::MAX {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ABSURD_EXTREME_COMPARISONS,
+ correctness,
+ "a comparison with a maximum or minimum value that is always true or false"
+}
+
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for any kind of arithmetic operation of any type.
++ ///
++ /// Operators like `+`, `-`, `*` or `<<` are usually capable of overflowing according to the [Rust
++ /// Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow),
++ /// or can panic (`/`, `%`). Known safe built-in types like `Wrapping` or `Saturing` are filtered
++ /// away.
++ ///
++ /// ### Why is this bad?
++ /// Integer overflow will trigger a panic in debug builds or will wrap in
++ /// release mode. Division by zero will cause a panic in either mode. In some applications one
++ /// wants explicitly checked, wrapping or saturating arithmetic.
++ ///
++ /// #### Example
++ /// ```rust
++ /// # let a = 0;
++ /// a + 1;
++ /// ```
++ ///
++ /// Third-party types also tend to overflow.
++ ///
++ /// #### Example
++ /// ```ignore,rust
++ /// use rust_decimal::Decimal;
++ /// let _n = Decimal::MAX + Decimal::MAX;
++ /// ```
++ ///
++ /// ### Allowed types
++ /// Custom allowed types can be specified through the "arithmetic-allowed" filter.
++ #[clippy::version = "1.64.0"]
++ pub ARITHMETIC,
++ restriction,
++ "any arithmetic expression that could overflow or panic"
++}
++
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for integer arithmetic operations which could overflow or panic.
+ ///
+ /// Specifically, checks for any operators (`+`, `-`, `*`, `<<`, etc) which are capable
+ /// of overflowing according to the [Rust
+ /// Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow),
+ /// or which can panic (`/`, `%`). No bounds analysis or sophisticated reasoning is
+ /// attempted.
+ ///
+ /// ### Why is this bad?
+ /// Integer overflow will trigger a panic in debug builds or will wrap in
+ /// release mode. Division by zero will cause a panic in either mode. In some applications one
+ /// wants explicitly checked, wrapping or saturating arithmetic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 0;
+ /// a + 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INTEGER_ARITHMETIC,
+ restriction,
+ "any integer arithmetic expression which could overflow or panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for float arithmetic.
+ ///
+ /// ### Why is this bad?
+ /// For some embedded systems or kernel development, it
+ /// can be useful to rule out floating-point numbers.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 0.0;
+ /// a + 1.0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_ARITHMETIC,
+ restriction,
+ "any floating-point arithmetic statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `a = a op b` or `a = b commutative_op a`
+ /// patterns.
+ ///
+ /// ### Why is this bad?
+ /// These can be written as the shorter `a op= b`.
+ ///
+ /// ### Known problems
+ /// While forbidden by the spec, `OpAssign` traits may have
+ /// implementations that differ from the regular `Op` impl.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 0;
+ /// // ...
+ ///
+ /// a = a + b;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 0;
+ /// // ...
+ ///
+ /// a += b;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ASSIGN_OP_PATTERN,
+ style,
+ "assigning the result of an operation on a variable to that same variable"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `a op= a op b` or `a op= b op a` patterns.
+ ///
+ /// ### Why is this bad?
+ /// Most likely these are bugs where one meant to write `a
+ /// op= b`.
+ ///
+ /// ### Known problems
+ /// Clippy cannot know for sure if `a op= a op b` should have
+ /// been `a = a op a op b` or `a = a op b`/`a op= b`. Therefore, it suggests both.
+ /// If `a op= a op b` is really the correct behavior it should be
+ /// written as `a = a op a op b` as it's less confusing.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = 5;
+ /// let b = 2;
+ /// // ...
+ /// a += a + b;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MISREFACTORED_ASSIGN_OP,
+ suspicious,
+ "having a variable on both sides of an assign op"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for incompatible bit masks in comparisons.
+ ///
+ /// The formula for detecting if an expression of the type `_ <bit_op> m
+ /// <cmp_op> c` (where `<bit_op>` is one of {`&`, `|`} and `<cmp_op>` is one of
+ /// {`!=`, `>=`, `>`, `!=`, `>=`, `>`}) can be determined from the following
+ /// table:
+ ///
+ /// |Comparison |Bit Op|Example |is always|Formula |
+ /// |------------|------|-------------|---------|----------------------|
+ /// |`==` or `!=`| `&` |`x & 2 == 3` |`false` |`c & m != c` |
+ /// |`<` or `>=`| `&` |`x & 2 < 3` |`true` |`m < c` |
+ /// |`>` or `<=`| `&` |`x & 1 > 1` |`false` |`m <= c` |
+ /// |`==` or `!=`| `\|` |`x \| 1 == 0`|`false` |`c \| m != c` |
+ /// |`<` or `>=`| `\|` |`x \| 1 < 1` |`false` |`m >= c` |
+ /// |`<=` or `>` | `\|` |`x \| 1 > 0` |`true` |`m > c` |
+ ///
+ /// ### Why is this bad?
+ /// If the bits that the comparison cares about are always
+ /// set to zero or one by the bit mask, the comparison is constant `true` or
+ /// `false` (depending on mask, compared value, and operators).
+ ///
+ /// So the code is actively misleading, and the only reason someone would write
+ /// this intentionally is to win an underhanded Rust contest or create a
+ /// test-case for this lint.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if (x & 1 == 2) { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub BAD_BIT_MASK,
+ correctness,
+ "expressions of the form `_ & mask == select` that will only ever return `true` or `false`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bit masks in comparisons which can be removed
+ /// without changing the outcome. The basic structure can be seen in the
+ /// following table:
+ ///
+ /// |Comparison| Bit Op |Example |equals |
+ /// |----------|----------|------------|-------|
+ /// |`>` / `<=`|`\|` / `^`|`x \| 2 > 3`|`x > 3`|
+ /// |`<` / `>=`|`\|` / `^`|`x ^ 1 < 4` |`x < 4`|
+ ///
+ /// ### Why is this bad?
+ /// Not equally evil as [`bad_bit_mask`](#bad_bit_mask),
+ /// but still a bit misleading, because the bit mask is ineffective.
+ ///
+ /// ### Known problems
+ /// False negatives: This lint will only match instances
+ /// where we have figured out the math (which is for a power-of-two compared
+ /// value). This means things like `x | 1 >= 7` (which would be better written
+ /// as `x >= 6`) will not be reported (but bit masks like this are fairly
+ /// uncommon).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if (x | 1 > 3) { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INEFFECTIVE_BIT_MASK,
+ correctness,
+ "expressions where a bit mask will be rendered useless by a comparison, e.g., `(x | 1) > 2`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for bit masks that can be replaced by a call
+ /// to `trailing_zeros`
+ ///
+ /// ### Why is this bad?
+ /// `x.trailing_zeros() > 4` is much clearer than `x & 15
+ /// == 0`
+ ///
+ /// ### Known problems
+ /// llvm generates better code for `x & 15 == 0` on x86
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if x & 0b1111 == 0 { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub VERBOSE_BIT_MASK,
+ pedantic,
+ "expressions where a bit mask is less readable than the corresponding method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for double comparisons that could be simplified to a single expression.
+ ///
+ ///
+ /// ### Why is this bad?
+ /// Readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// # let y = 2;
+ /// if x == y || x < y {}
+ /// ```
+ ///
+ /// Use instead:
+ ///
+ /// ```rust
+ /// # let x = 1;
+ /// # let y = 2;
+ /// if x <= y {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DOUBLE_COMPARISONS,
+ complexity,
+ "unnecessary double comparisons that can be simplified"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calculation of subsecond microseconds or milliseconds
+ /// from other `Duration` methods.
+ ///
+ /// ### Why is this bad?
+ /// It's more concise to call `Duration::subsec_micros()` or
+ /// `Duration::subsec_millis()` than to calculate them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::time::Duration;
+ /// # let duration = Duration::new(5, 0);
+ /// let micros = duration.subsec_nanos() / 1_000;
+ /// let millis = duration.subsec_nanos() / 1_000_000;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # use std::time::Duration;
+ /// # let duration = Duration::new(5, 0);
+ /// let micros = duration.subsec_micros();
+ /// let millis = duration.subsec_millis();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DURATION_SUBSEC,
+ complexity,
+ "checks for calculation of subsecond microseconds or milliseconds"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for equal operands to comparison, logical and
+ /// bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
+ /// `||`, `&`, `|`, `^`, `-` and `/`).
+ ///
+ /// ### Why is this bad?
+ /// This is usually just a typo or a copy and paste error.
+ ///
+ /// ### Known problems
+ /// False negatives: We had some false positives regarding
+ /// calls (notably [racer](https://github.com/phildawes/racer) had one instance
+ /// of `x.pop() && x.pop()`), so we removed matching any function or method
+ /// calls. We may introduce a list of known pure functions in the future.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if x + 1 == x + 1 {}
+ ///
+ /// // or
+ ///
+ /// # let a = 3;
+ /// # let b = 4;
+ /// assert_eq!(a, a);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EQ_OP,
+ correctness,
+ "equal operands on both sides of a comparison or bitwise combination (e.g., `x == x`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arguments to `==` which have their address
+ /// taken to satisfy a bound
+ /// and suggests to dereference the other argument instead
+ ///
+ /// ### Why is this bad?
+ /// It is more idiomatic to dereference the other argument.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// &x == y
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// x == *y
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OP_REF,
+ style,
+ "taking a reference to satisfy the type constraints on `==`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for erasing operations, e.g., `x * 0`.
+ ///
+ /// ### Why is this bad?
+ /// The whole expression can be replaced by zero.
+ /// This is most likely not the intended outcome and should probably be
+ /// corrected
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 1;
+ /// 0 / x;
+ /// 0 * x;
+ /// x & 0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ERASING_OP,
+ correctness,
+ "using erasing operations, e.g., `x * 0` or `y & 0`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for statements of the form `(a - b) < f32::EPSILON` or
+ /// `(a - b) < f64::EPSILON`. Notes the missing `.abs()`.
+ ///
+ /// ### Why is this bad?
+ /// The code without `.abs()` is more likely to have a bug.
+ ///
+ /// ### Known problems
+ /// If the user can ensure that b is larger than a, the `.abs()` is
+ /// technically unnecessary. However, it will make the code more robust and doesn't have any
+ /// large performance implications. If the abs call was deliberately left out for performance
+ /// reasons, it is probably better to state this explicitly in the code, which then can be done
+ /// with an allow.
+ ///
+ /// ### Example
+ /// ```rust
+ /// pub fn is_roughly_equal(a: f32, b: f32) -> bool {
+ /// (a - b) < f32::EPSILON
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// pub fn is_roughly_equal(a: f32, b: f32) -> bool {
+ /// (a - b).abs() < f32::EPSILON
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub FLOAT_EQUALITY_WITHOUT_ABS,
+ suspicious,
+ "float equality check without `.abs()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for identity operations, e.g., `x + 0`.
+ ///
+ /// ### Why is this bad?
+ /// This code can be removed without changing the
+ /// meaning. So it just obscures what's going on. Delete it mercilessly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// x / 1 + 0 * 1 - 0 | 0;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub IDENTITY_OP,
+ complexity,
+ "using identity operations, e.g., `x + 0` or `y / 1`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for division of integers
+ ///
+ /// ### Why is this bad?
+ /// When outside of some very specific algorithms,
+ /// integer division is very often a mistake because it discards the
+ /// remainder.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 3 / 2;
+ /// println!("{}", x);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = 3f32 / 2f32;
+ /// println!("{}", x);
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub INTEGER_DIVISION,
+ restriction,
+ "integer division may cause loss of precision"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons to NaN.
+ ///
+ /// ### Why is this bad?
+ /// NaN does not compare meaningfully to anything – not
+ /// even itself – so those comparisons are simply wrong.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1.0;
+ /// if x == f32::NAN { }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 1.0f32;
+ /// if x.is_nan() { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_NAN,
+ correctness,
+ "comparisons to `NAN`, which will always return false, probably not intended"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for conversions to owned values just for the sake
+ /// of a comparison.
+ ///
+ /// ### Why is this bad?
+ /// The comparison can operate on a reference, so creating
+ /// an owned value effectively throws it away directly afterwards, which is
+ /// needlessly consuming code and heap space.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = "foo";
+ /// # let y = String::from("foo");
+ /// if x.to_owned() == y {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = "foo";
+ /// # let y = String::from("foo");
+ /// if x == y {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_OWNED,
+ perf,
+ "creating owned instances for comparing with others, e.g., `x == \"foo\".to_string()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for (in-)equality comparisons on floating-point
+ /// values (apart from zero), except in functions called `*eq*` (which probably
+ /// implement equality for a type involving floats).
+ ///
+ /// ### Why is this bad?
+ /// Floating point calculations are usually imprecise, so
+ /// asking if two values are *exactly* equal is asking for trouble. For a good
+ /// guide on what to do, see [the floating point
+ /// guide](http://www.floating-point-gui.de/errors/comparison).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 1.2331f64;
+ /// let y = 1.2332f64;
+ ///
+ /// if y == 1.23f64 { }
+ /// if y != x {} // where both are floats
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 1.2331f64;
+ /// # let y = 1.2332f64;
+ /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
+ /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
+ /// // let error_margin = std::f64::EPSILON;
+ /// if (y - 1.23f64).abs() < error_margin { }
+ /// if (y - x).abs() > error_margin { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_CMP,
+ pedantic,
+ "using `==` or `!=` on float values instead of comparing difference with an epsilon"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for (in-)equality comparisons on floating-point
+ /// value and constant, except in functions called `*eq*` (which probably
+ /// implement equality for a type involving floats).
+ ///
+ /// ### Why is this bad?
+ /// Floating point calculations are usually imprecise, so
+ /// asking if two values are *exactly* equal is asking for trouble. For a good
+ /// guide on what to do, see [the floating point
+ /// guide](http://www.floating-point-gui.de/errors/comparison).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: f64 = 1.0;
+ /// const ONE: f64 = 1.00;
+ ///
+ /// if x == ONE { } // where both are floats
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x: f64 = 1.0;
+ /// # const ONE: f64 = 1.00;
+ /// let error_margin = f64::EPSILON; // Use an epsilon for comparison
+ /// // Or, if Rust <= 1.42, use `std::f64::EPSILON` constant instead.
+ /// // let error_margin = std::f64::EPSILON;
+ /// if (x - ONE).abs() < error_margin { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FLOAT_CMP_CONST,
+ restriction,
+ "using `==` or `!=` on float constants instead of comparing difference with an epsilon"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for getting the remainder of a division by one or minus
+ /// one.
+ ///
+ /// ### Why is this bad?
+ /// The result for a divisor of one can only ever be zero; for
+ /// minus one it can cause panic/overflow (if the left operand is the minimal value of
+ /// the respective integer type) or results in zero. No one will write such code
+ /// deliberately, unless trying to win an Underhanded Rust Contest. Even for that
+ /// contest, it's probably a bad idea. Use something more underhanded.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// let a = x % 1;
+ /// let a = x % -1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MODULO_ONE,
+ correctness,
+ "taking a number modulo +/-1, which can either panic/overflow or always returns 0"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for modulo arithmetic.
+ ///
+ /// ### Why is this bad?
+ /// The results of modulo (%) operation might differ
+ /// depending on the language, when negative numbers are involved.
+ /// If you interop with different languages it might be beneficial
+ /// to double check all places that use modulo arithmetic.
+ ///
+ /// For example, in Rust `17 % -3 = 2`, but in Python `17 % -3 = -1`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = -17 % 3;
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub MODULO_ARITHMETIC,
+ restriction,
+ "any modulo arithmetic statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for uses of bitwise and/or operators between booleans, where performance may be improved by using
+ /// a lazy and.
+ ///
+ /// ### Why is this bad?
+ /// The bitwise operators do not support short-circuiting, so it may hinder code performance.
+ /// Additionally, boolean logic "masked" as bitwise logic is not caught by lints like `unnecessary_fold`
+ ///
+ /// ### Known problems
+ /// This lint evaluates only when the right side is determined to have no side effects. At this time, that
+ /// determination is quite conservative.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let (x,y) = (true, false);
+ /// if x & !y {} // where both x and y are booleans
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let (x,y) = (true, false);
+ /// if x && !y {}
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub NEEDLESS_BITWISE_BOOL,
+ pedantic,
+ "Boolean expressions that use bitwise rather than lazy operators"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Use `std::ptr::eq` when applicable
+ ///
+ /// ### Why is this bad?
+ /// `ptr::eq` can be used to compare `&T` references
+ /// (which coerce to `*const T` implicitly) by their address rather than
+ /// comparing the values they point to.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = &[1, 2, 3];
+ /// let b = &[1, 2, 3];
+ ///
+ /// assert!(a as *const _ as usize == b as *const _ as usize);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let a = &[1, 2, 3];
+ /// let b = &[1, 2, 3];
+ ///
+ /// assert!(std::ptr::eq(a, b));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub PTR_EQ,
+ style,
+ "use `std::ptr::eq` when comparing raw pointers"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit self-assignments.
+ ///
+ /// ### Why is this bad?
+ /// Self-assignments are redundant and unlikely to be
+ /// intentional.
+ ///
+ /// ### Known problems
+ /// If expression contains any deref coercions or
+ /// indexing operations they are assumed not to have any side effects.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct Event {
+ /// x: i32,
+ /// }
+ ///
+ /// fn copy_position(a: &mut Event, b: &Event) {
+ /// a.x = a.x;
+ /// }
+ /// ```
+ ///
+ /// Should be:
+ /// ```rust
+ /// struct Event {
+ /// x: i32,
+ /// }
+ ///
+ /// fn copy_position(a: &mut Event, b: &Event) {
+ /// a.x = b.x;
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub SELF_ASSIGNMENT,
+ correctness,
+ "explicit self-assignment"
+}
+
+pub struct Operators {
+ arithmetic_context: numeric_arithmetic::Context,
+ verbose_bit_mask_threshold: u64,
+}
+impl_lint_pass!(Operators => [
+ ABSURD_EXTREME_COMPARISONS,
++ ARITHMETIC,
+ INTEGER_ARITHMETIC,
+ FLOAT_ARITHMETIC,
+ ASSIGN_OP_PATTERN,
+ MISREFACTORED_ASSIGN_OP,
+ BAD_BIT_MASK,
+ INEFFECTIVE_BIT_MASK,
+ VERBOSE_BIT_MASK,
+ DOUBLE_COMPARISONS,
+ DURATION_SUBSEC,
+ EQ_OP,
+ OP_REF,
+ ERASING_OP,
+ FLOAT_EQUALITY_WITHOUT_ABS,
+ IDENTITY_OP,
+ INTEGER_DIVISION,
+ CMP_NAN,
+ CMP_OWNED,
+ FLOAT_CMP,
+ FLOAT_CMP_CONST,
+ MODULO_ONE,
+ MODULO_ARITHMETIC,
+ NEEDLESS_BITWISE_BOOL,
+ PTR_EQ,
+ SELF_ASSIGNMENT,
+]);
+impl Operators {
+ pub fn new(verbose_bit_mask_threshold: u64) -> Self {
+ Self {
+ arithmetic_context: numeric_arithmetic::Context::default(),
+ verbose_bit_mask_threshold,
+ }
+ }
+}
+impl<'tcx> LateLintPass<'tcx> for Operators {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ eq_op::check_assert(cx, e);
+ match e.kind {
+ ExprKind::Binary(op, lhs, rhs) => {
+ if !e.span.from_expansion() {
+ absurd_extreme_comparisons::check(cx, e, op.node, lhs, rhs);
+ if !(macro_with_not_op(lhs) || macro_with_not_op(rhs)) {
+ eq_op::check(cx, e, op.node, lhs, rhs);
+ op_ref::check(cx, e, op.node, lhs, rhs);
+ }
+ erasing_op::check(cx, e, op.node, lhs, rhs);
+ identity_op::check(cx, e, op.node, lhs, rhs);
+ needless_bitwise_bool::check(cx, e, op.node, lhs, rhs);
+ ptr_eq::check(cx, e, op.node, lhs, rhs);
+ }
+ self.arithmetic_context.check_binary(cx, e, op.node, lhs, rhs);
+ bit_mask::check(cx, e, op.node, lhs, rhs);
+ verbose_bit_mask::check(cx, e, op.node, lhs, rhs, self.verbose_bit_mask_threshold);
+ double_comparison::check(cx, op.node, lhs, rhs, e.span);
+ duration_subsec::check(cx, e, op.node, lhs, rhs);
+ float_equality_without_abs::check(cx, e, op.node, lhs, rhs);
+ integer_division::check(cx, e, op.node, lhs, rhs);
+ cmp_nan::check(cx, e, op.node, lhs, rhs);
+ cmp_owned::check(cx, op.node, lhs, rhs);
+ float_cmp::check(cx, e, op.node, lhs, rhs);
+ modulo_one::check(cx, e, op.node, rhs);
+ modulo_arithmetic::check(cx, e, op.node, lhs, rhs);
+ },
+ ExprKind::AssignOp(op, lhs, rhs) => {
+ self.arithmetic_context.check_binary(cx, e, op.node, lhs, rhs);
+ misrefactored_assign_op::check(cx, e, op.node, lhs, rhs);
+ modulo_arithmetic::check(cx, e, op.node, lhs, rhs);
+ },
+ ExprKind::Assign(lhs, rhs, _) => {
+ assign_op_pattern::check(cx, e, lhs, rhs);
+ self_assignment::check(cx, e, lhs, rhs);
+ },
+ ExprKind::Unary(op, arg) => {
+ if op == UnOp::Neg {
+ self.arithmetic_context.check_negate(cx, e, arg);
+ }
+ },
+ _ => (),
+ }
+ }
+
+ fn check_expr_post(&mut self, _: &LateContext<'_>, e: &Expr<'_>) {
+ self.arithmetic_context.expr_post(e.hir_id);
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'tcx>, b: &'tcx Body<'_>) {
+ self.arithmetic_context.enter_body(cx, b);
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'tcx>, b: &'tcx Body<'_>) {
+ self.arithmetic_context.body_post(cx, b);
+ }
+}
+
+fn macro_with_not_op(e: &Expr<'_>) -> bool {
+ if let ExprKind::Unary(_, e) = e.kind {
+ e.span.from_expansion()
+ } else {
+ false
+ }
+}
--- /dev/null
- if let PatKind::TupleStruct(ref path1, fields, None) = let_pat.kind;
- if let PatKind::Binding(annot, bind_id, ident, _) = fields[0].kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::higher;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{
+ eq_expr_value, get_parent_node, is_else_clause, is_lang_ctor, path_to_local, path_to_local_id, peel_blocks,
+ peel_blocks_with_stmt,
+};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::LangItem::{OptionNone, OptionSome, ResultErr, ResultOk};
+use rustc_hir::{BindingAnnotation, Expr, ExprKind, Node, PatKind, PathSegment, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::Ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{sym, symbol::Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for expressions that could be replaced by the question mark operator.
+ ///
+ /// ### Why is this bad?
+ /// Question mark usage is more idiomatic.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if option.is_none() {
+ /// return None;
+ /// }
+ /// ```
+ ///
+ /// Could be written:
+ ///
+ /// ```ignore
+ /// option?;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub QUESTION_MARK,
+ style,
+ "checks for expressions that could be replaced by the question mark operator"
+}
+
+declare_lint_pass!(QuestionMark => [QUESTION_MARK]);
+
+enum IfBlockType<'hir> {
+ /// An `if x.is_xxx() { a } else { b } ` expression.
+ ///
+ /// Contains: caller (x), caller_type, call_sym (is_xxx), if_then (a), if_else (b)
+ IfIs(
+ &'hir Expr<'hir>,
+ Ty<'hir>,
+ Symbol,
+ &'hir Expr<'hir>,
+ Option<&'hir Expr<'hir>>,
+ ),
+ /// An `if let Xxx(a) = b { c } else { d }` expression.
+ ///
+ /// Contains: let_pat_qpath (Xxx), let_pat_type, let_pat_sym (a), let_expr (b), if_then (c),
+ /// if_else (d)
+ IfLet(
+ &'hir QPath<'hir>,
+ Ty<'hir>,
+ Symbol,
+ &'hir Expr<'hir>,
+ &'hir Expr<'hir>,
+ Option<&'hir Expr<'hir>>,
+ ),
+}
+
+/// Checks if the given expression on the given context matches the following structure:
+///
+/// ```ignore
+/// if option.is_none() {
+/// return None;
+/// }
+/// ```
+///
+/// ```ignore
+/// if result.is_err() {
+/// return result;
+/// }
+/// ```
+///
+/// If it matches, it will suggest to use the question mark operator instead
+fn check_is_none_or_err_and_early_return<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
+ if_chain! {
+ if let Some(higher::If { cond, then, r#else }) = higher::If::hir(expr);
+ if !is_else_clause(cx.tcx, expr);
+ if let ExprKind::MethodCall(segment, args, _) = &cond.kind;
+ if let Some(caller) = args.get(0);
+ let caller_ty = cx.typeck_results().expr_ty(caller);
+ let if_block = IfBlockType::IfIs(caller, caller_ty, segment.ident.name, then, r#else);
+ if is_early_return(sym::Option, cx, &if_block) || is_early_return(sym::Result, cx, &if_block);
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let receiver_str = snippet_with_applicability(cx, caller.span, "..", &mut applicability);
+ let by_ref = !caller_ty.is_copy_modulo_regions(cx.tcx.at(caller.span), cx.param_env) &&
+ !matches!(caller.kind, ExprKind::Call(..) | ExprKind::MethodCall(..));
+ let sugg = if let Some(else_inner) = r#else {
+ if eq_expr_value(cx, caller, peel_blocks(else_inner)) {
+ format!("Some({}?)", receiver_str)
+ } else {
+ return;
+ }
+ } else {
+ format!("{}{}?;", receiver_str, if by_ref { ".as_ref()" } else { "" })
+ };
+
+ span_lint_and_sugg(
+ cx,
+ QUESTION_MARK,
+ expr.span,
+ "this block may be rewritten with the `?` operator",
+ "replace it with",
+ sugg,
+ applicability,
+ );
+ }
+ }
+}
+
+fn check_if_let_some_or_err_and_early_return<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
+ if_chain! {
+ if let Some(higher::IfLet { let_pat, let_expr, if_then, if_else }) = higher::IfLet::hir(cx, expr);
+ if !is_else_clause(cx.tcx, expr);
++ if let PatKind::TupleStruct(ref path1, [field], None) = let_pat.kind;
++ if let PatKind::Binding(annot, bind_id, ident, _) = field.kind;
+ let caller_ty = cx.typeck_results().expr_ty(let_expr);
+ let if_block = IfBlockType::IfLet(path1, caller_ty, ident.name, let_expr, if_then, if_else);
+ if (is_early_return(sym::Option, cx, &if_block) && path_to_local_id(peel_blocks(if_then), bind_id))
+ || is_early_return(sym::Result, cx, &if_block);
+ if if_else.map(|e| eq_expr_value(cx, let_expr, peel_blocks(e))).filter(|e| *e).is_none();
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let receiver_str = snippet_with_applicability(cx, let_expr.span, "..", &mut applicability);
+ let by_ref = matches!(annot, BindingAnnotation::Ref | BindingAnnotation::RefMut);
+ let requires_semi = matches!(get_parent_node(cx.tcx, expr.hir_id), Some(Node::Stmt(_)));
+ let sugg = format!(
+ "{}{}?{}",
+ receiver_str,
+ if by_ref { ".as_ref()" } else { "" },
+ if requires_semi { ";" } else { "" }
+ );
+ span_lint_and_sugg(
+ cx,
+ QUESTION_MARK,
+ expr.span,
+ "this block may be rewritten with the `?` operator",
+ "replace it with",
+ sugg,
+ applicability,
+ );
+ }
+ }
+}
+
+fn is_early_return(smbl: Symbol, cx: &LateContext<'_>, if_block: &IfBlockType<'_>) -> bool {
+ match *if_block {
+ IfBlockType::IfIs(caller, caller_ty, call_sym, if_then, _) => {
+ // If the block could be identified as `if x.is_none()/is_err()`,
+ // we then only need to check the if_then return to see if it is none/err.
+ is_type_diagnostic_item(cx, caller_ty, smbl)
+ && expr_return_none_or_err(smbl, cx, if_then, caller, None)
+ && match smbl {
+ sym::Option => call_sym == sym!(is_none),
+ sym::Result => call_sym == sym!(is_err),
+ _ => false,
+ }
+ },
+ IfBlockType::IfLet(qpath, let_expr_ty, let_pat_sym, let_expr, if_then, if_else) => {
+ is_type_diagnostic_item(cx, let_expr_ty, smbl)
+ && match smbl {
+ sym::Option => {
+ // We only need to check `if let Some(x) = option` not `if let None = option`,
+ // because the later one will be suggested as `if option.is_none()` thus causing conflict.
+ is_lang_ctor(cx, qpath, OptionSome)
+ && if_else.is_some()
+ && expr_return_none_or_err(smbl, cx, if_else.unwrap(), let_expr, None)
+ },
+ sym::Result => {
+ (is_lang_ctor(cx, qpath, ResultOk)
+ && if_else.is_some()
+ && expr_return_none_or_err(smbl, cx, if_else.unwrap(), let_expr, Some(let_pat_sym)))
+ || is_lang_ctor(cx, qpath, ResultErr)
+ && expr_return_none_or_err(smbl, cx, if_then, let_expr, Some(let_pat_sym))
+ },
+ _ => false,
+ }
+ },
+ }
+}
+
+fn expr_return_none_or_err(
+ smbl: Symbol,
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ cond_expr: &Expr<'_>,
+ err_sym: Option<Symbol>,
+) -> bool {
+ match peel_blocks_with_stmt(expr).kind {
+ ExprKind::Ret(Some(ret_expr)) => expr_return_none_or_err(smbl, cx, ret_expr, cond_expr, err_sym),
+ ExprKind::Path(ref qpath) => match smbl {
+ sym::Option => is_lang_ctor(cx, qpath, OptionNone),
+ sym::Result => path_to_local(expr).is_some() && path_to_local(expr) == path_to_local(cond_expr),
+ _ => false,
+ },
+ ExprKind::Call(call_expr, args_expr) => {
+ if_chain! {
+ if smbl == sym::Result;
+ if let ExprKind::Path(QPath::Resolved(_, path)) = &call_expr.kind;
+ if let Some(segment) = path.segments.first();
+ if let Some(err_sym) = err_sym;
+ if let Some(arg) = args_expr.first();
+ if let ExprKind::Path(QPath::Resolved(_, arg_path)) = &arg.kind;
+ if let Some(PathSegment { ident, .. }) = arg_path.segments.first();
+ then {
+ return segment.ident.name == sym::Err && err_sym == ident.name;
+ }
+ }
+ false
+ },
+ _ => false,
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for QuestionMark {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ check_is_none_or_err_and_early_return(cx, expr);
+ check_if_let_some_or_err_and_early_return(cx, expr);
+ }
+}
--- /dev/null
- use rustc_lint::{LateContext, LateLintPass, Lint};
- use rustc_session::{declare_lint_pass, declare_tool_lint};
- use rustc_span::{sym, symbol::kw, Symbol};
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_hir::{def::Res, HirId, Path, PathSegment};
- /// imported from alloc to ensure disabling `alloc` does not cause the crate to fail to compile. This lint
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::{sym, symbol::kw, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Finds items imported through `std` when available through `core`.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Crates which have `no_std` compatibility may wish to ensure types are imported from core to ensure
+ /// disabling `std` does not cause the crate to fail to compile. This lint is also useful for crates
+ /// migrating to become `no_std` compatible.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::hash::Hasher;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use core::hash::Hasher;
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub STD_INSTEAD_OF_CORE,
+ restriction,
+ "type is imported from std when available in core"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Finds items imported through `std` when available through `alloc`.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Crates which have `no_std` compatibility and require alloc may wish to ensure types are imported from
+ /// alloc to ensure disabling `std` does not cause the crate to fail to compile. This lint is also useful
+ /// for crates migrating to become `no_std` compatible.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::vec::Vec;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # extern crate alloc;
+ /// use alloc::vec::Vec;
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub STD_INSTEAD_OF_ALLOC,
+ restriction,
+ "type is imported from std when available in alloc"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Finds items imported through `alloc` when available through `core`.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Crates which have `no_std` compatibility and may optionally require alloc may wish to ensure types are
- declare_lint_pass!(StdReexports => [STD_INSTEAD_OF_CORE, STD_INSTEAD_OF_ALLOC, ALLOC_INSTEAD_OF_CORE]);
++ /// imported from core to ensure disabling `alloc` does not cause the crate to fail to compile. This lint
+ /// is also useful for crates migrating to become `no_std` compatible.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # extern crate alloc;
+ /// use alloc::slice::from_ref;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// use core::slice::from_ref;
+ /// ```
+ #[clippy::version = "1.64.0"]
+ pub ALLOC_INSTEAD_OF_CORE,
+ restriction,
+ "type is imported from alloc when available in core"
+}
+
- // std_instead_of_core
- check_path(cx, path, sym::std, sym::core, STD_INSTEAD_OF_CORE);
- // std_instead_of_alloc
- check_path(cx, path, sym::std, sym::alloc, STD_INSTEAD_OF_ALLOC);
- // alloc_instead_of_core
- check_path(cx, path, sym::alloc, sym::core, ALLOC_INSTEAD_OF_CORE);
- }
- }
-
- fn check_path(cx: &LateContext<'_>, path: &Path<'_>, krate: Symbol, suggested_crate: Symbol, lint: &'static Lint) {
- if_chain! {
- // check if path resolves to the suggested crate.
- if let Res::Def(_, def_id) = path.res;
- if suggested_crate == cx.tcx.crate_name(def_id.krate);
-
- // check if the first segment of the path is the crate we want to identify
- if let Some(path_root_segment) = get_first_segment(path);
-
- // check if the path matches the crate we want to suggest the other path for.
- if krate == path_root_segment.ident.name;
- then {
- span_lint_and_help(
- cx,
- lint,
- path.span,
- &format!("used import from `{}` instead of `{}`", krate, suggested_crate),
- None,
- &format!("consider importing the item from `{}`", suggested_crate),
- );
++#[derive(Default)]
++pub struct StdReexports {
++ // Paths which can be either a module or a macro (e.g. `std::env`) will cause this check to happen
++ // twice. First for the mod, second for the macro. This is used to avoid the lint reporting for the macro
++ // when the path could be also be used to access the module.
++ prev_span: Span,
++}
++impl_lint_pass!(StdReexports => [STD_INSTEAD_OF_CORE, STD_INSTEAD_OF_ALLOC, ALLOC_INSTEAD_OF_CORE]);
+
+impl<'tcx> LateLintPass<'tcx> for StdReexports {
+ fn check_path(&mut self, cx: &LateContext<'tcx>, path: &Path<'tcx>, _: HirId) {
- let segment = path.segments.first()?;
-
- // A global path will have PathRoot as the first segment. In this case, return the segment after.
- if segment.ident.name == kw::PathRoot {
- path.segments.get(1)
- } else {
- Some(segment)
++ if let Res::Def(_, def_id) = path.res
++ && let Some(first_segment) = get_first_segment(path)
++ {
++ let (lint, msg, help) = match first_segment.ident.name {
++ sym::std => match cx.tcx.crate_name(def_id.krate) {
++ sym::core => (
++ STD_INSTEAD_OF_CORE,
++ "used import from `std` instead of `core`",
++ "consider importing the item from `core`",
++ ),
++ sym::alloc => (
++ STD_INSTEAD_OF_ALLOC,
++ "used import from `std` instead of `alloc`",
++ "consider importing the item from `alloc`",
++ ),
++ _ => {
++ self.prev_span = path.span;
++ return;
++ },
++ },
++ sym::alloc => {
++ if cx.tcx.crate_name(def_id.krate) == sym::core {
++ (
++ ALLOC_INSTEAD_OF_CORE,
++ "used import from `alloc` instead of `core`",
++ "consider importing the item from `core`",
++ )
++ } else {
++ self.prev_span = path.span;
++ return;
++ }
++ },
++ _ => return,
++ };
++ if path.span != self.prev_span {
++ span_lint_and_help(cx, lint, path.span, msg, None, help);
++ self.prev_span = path.span;
++ }
+ }
+ }
+}
+
+/// Returns the first named segment of a [`Path`].
+///
+/// If this is a global path (such as `::std::fmt::Debug`), then the segment after [`kw::PathRoot`]
+/// is returned.
+fn get_first_segment<'tcx>(path: &Path<'tcx>) -> Option<&'tcx PathSegment<'tcx>> {
++ match path.segments {
++ // A global path will have PathRoot as the first segment. In this case, return the segment after.
++ [x, y, ..] if x.ident.name == kw::PathRoot => Some(y),
++ [x, ..] => Some(x),
++ _ => None,
+ }
+}
--- /dev/null
- if path.ident.name == sym!(to_string);
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg};
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{get_parent_expr, is_lint_allowed, match_function_call, method_calls, paths};
+use clippy_utils::{peel_blocks, SpanlessEq};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::def_id::DefId;
+use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind, LangItem, QPath};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Spanned;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for string appends of the form `x = x + y` (without
+ /// `let`!).
+ ///
+ /// ### Why is this bad?
+ /// It's not really bad, but some people think that the
+ /// `.push_str(_)` method is more readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut x = "Hello".to_owned();
+ /// x = x + ", World";
+ ///
+ /// // More readable
+ /// x += ", World";
+ /// x.push_str(", World");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_ADD_ASSIGN,
+ pedantic,
+ "using `x = x + ..` where x is a `String` instead of `push_str()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for all instances of `x + _` where `x` is of type
+ /// `String`, but only if [`string_add_assign`](#string_add_assign) does *not*
+ /// match.
+ ///
+ /// ### Why is this bad?
+ /// It's not bad in and of itself. However, this particular
+ /// `Add` implementation is asymmetric (the other operand need not be `String`,
+ /// but `x` does), while addition as mathematically defined is symmetric, also
+ /// the `String::push_str(_)` function is a perfectly good replacement.
+ /// Therefore, some dislike it and wish not to have it in their code.
+ ///
+ /// That said, other people think that string addition, having a long tradition
+ /// in other languages is actually fine, which is why we decided to make this
+ /// particular lint `allow` by default.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = "Hello".to_owned();
+ /// x + ", World";
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let mut x = "Hello".to_owned();
+ /// x.push_str(", World");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_ADD,
+ restriction,
+ "using `x + ..` where x is a `String` instead of `push_str()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the `as_bytes` method called on string literals
+ /// that contain only ASCII characters.
+ ///
+ /// ### Why is this bad?
+ /// Byte string literals (e.g., `b"foo"`) can be used
+ /// instead. They are shorter but less discoverable than `as_bytes()`.
+ ///
+ /// ### Known problems
+ /// `"str".as_bytes()` and the suggested replacement of `b"str"` are not
+ /// equivalent because they have different types. The former is `&[u8]`
+ /// while the latter is `&[u8; 3]`. That means in general they will have a
+ /// different set of methods and different trait implementations.
+ ///
+ /// ```compile_fail
+ /// fn f(v: Vec<u8>) {}
+ ///
+ /// f("...".as_bytes().to_owned()); // works
+ /// f(b"...".to_owned()); // does not work, because arg is [u8; 3] not Vec<u8>
+ ///
+ /// fn g(r: impl std::io::Read) {}
+ ///
+ /// g("...".as_bytes()); // works
+ /// g(b"..."); // does not work
+ /// ```
+ ///
+ /// The actual equivalent of `"str".as_bytes()` with the same type is not
+ /// `b"str"` but `&b"str"[..]`, which is a great deal of punctuation and not
+ /// more readable than a function call.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let bstr = "a byte string".as_bytes();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let bstr = b"a byte string";
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_LIT_AS_BYTES,
+ nursery,
+ "calling `as_bytes` on a string literal instead of using a byte string literal"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for slice operations on strings
+ ///
+ /// ### Why is this bad?
+ /// UTF-8 characters span multiple bytes, and it is easy to inadvertently confuse character
+ /// counts and string indices. This may lead to panics, and should warrant some test cases
+ /// containing wide UTF-8 characters. This lint is most useful in code that should avoid
+ /// panics at all costs.
+ ///
+ /// ### Known problems
+ /// Probably lots of false positives. If an index comes from a known valid position (e.g.
+ /// obtained via `char_indices` over the same string), it is totally OK.
+ ///
+ /// # Example
+ /// ```rust,should_panic
+ /// &"Ölkanne"[1..];
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub STRING_SLICE,
+ restriction,
+ "slicing a string"
+}
+
+declare_lint_pass!(StringAdd => [STRING_ADD, STRING_ADD_ASSIGN, STRING_SLICE]);
+
+impl<'tcx> LateLintPass<'tcx> for StringAdd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if in_external_macro(cx.sess(), e.span) {
+ return;
+ }
+ match e.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ left,
+ _,
+ ) => {
+ if is_string(cx, left) {
+ if !is_lint_allowed(cx, STRING_ADD_ASSIGN, e.hir_id) {
+ let parent = get_parent_expr(cx, e);
+ if let Some(p) = parent {
+ if let ExprKind::Assign(target, _, _) = p.kind {
+ // avoid duplicate matches
+ if SpanlessEq::new(cx).eq_expr(target, left) {
+ return;
+ }
+ }
+ }
+ }
+ span_lint(
+ cx,
+ STRING_ADD,
+ e.span,
+ "you added something to a string. Consider using `String::push_str()` instead",
+ );
+ }
+ },
+ ExprKind::Assign(target, src, _) => {
+ if is_string(cx, target) && is_add(cx, src, target) {
+ span_lint(
+ cx,
+ STRING_ADD_ASSIGN,
+ e.span,
+ "you assigned the result of adding something to this string. Consider using \
+ `String::push_str()` instead",
+ );
+ }
+ },
+ ExprKind::Index(target, _idx) => {
+ let e_ty = cx.typeck_results().expr_ty(target).peel_refs();
+ if matches!(e_ty.kind(), ty::Str) || is_type_diagnostic_item(cx, e_ty, sym::String) {
+ span_lint(
+ cx,
+ STRING_SLICE,
+ e.span,
+ "indexing into a string may panic if the index is within a UTF-8 character",
+ );
+ }
+ },
+ _ => {},
+ }
+ }
+}
+
+fn is_string(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), sym::String)
+}
+
+fn is_add(cx: &LateContext<'_>, src: &Expr<'_>, target: &Expr<'_>) -> bool {
+ match peel_blocks(src).kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ left,
+ _,
+ ) => SpanlessEq::new(cx).eq_expr(target, left),
+ _ => false,
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check if the string is transformed to byte array and casted back to string.
+ ///
+ /// ### Why is this bad?
+ /// It's unnecessary, the string can be used directly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// std::str::from_utf8(&"Hello World!".as_bytes()[6..11]).unwrap();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// &"Hello World!"[6..11];
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub STRING_FROM_UTF8_AS_BYTES,
+ complexity,
+ "casting string slices to byte slices and back"
+}
+
+// Max length a b"foo" string can take
+const MAX_LENGTH_BYTE_STRING_LIT: usize = 32;
+
+declare_lint_pass!(StringLitAsBytes => [STRING_LIT_AS_BYTES, STRING_FROM_UTF8_AS_BYTES]);
+
+impl<'tcx> LateLintPass<'tcx> for StringLitAsBytes {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ use rustc_ast::LitKind;
+
+ if_chain! {
+ // Find std::str::converts::from_utf8
+ if let Some(args) = match_function_call(cx, e, &paths::STR_FROM_UTF8);
+
+ // Find string::as_bytes
+ if let ExprKind::AddrOf(BorrowKind::Ref, _, args) = args[0].kind;
+ if let ExprKind::Index(left, right) = args.kind;
+ let (method_names, expressions, _) = method_calls(left, 1);
+ if method_names.len() == 1;
+ if expressions.len() == 1;
+ if expressions[0].len() == 1;
+ if method_names[0] == sym!(as_bytes);
+
+ // Check for slicer
+ if let ExprKind::Struct(QPath::LangItem(LangItem::Range, ..), _, _) = right.kind;
+
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let string_expression = &expressions[0][0];
+
+ let snippet_app = snippet_with_applicability(
+ cx,
+ string_expression.span, "..",
+ &mut applicability,
+ );
+
+ span_lint_and_sugg(
+ cx,
+ STRING_FROM_UTF8_AS_BYTES,
+ e.span,
+ "calling a slice of `as_bytes()` with `from_utf8` should be not necessary",
+ "try",
+ format!("Some(&{}[{}])", snippet_app, snippet(cx, right.span, "..")),
+ applicability
+ )
+ }
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, args, _) = &e.kind;
+ if path.ident.name == sym!(as_bytes);
+ if let ExprKind::Lit(lit) = &args[0].kind;
+ if let LitKind::Str(lit_content, _) = &lit.node;
+ then {
+ let callsite = snippet(cx, args[0].span.source_callsite(), r#""foo""#);
+ let mut applicability = Applicability::MachineApplicable;
+ if callsite.starts_with("include_str!") {
+ span_lint_and_sugg(
+ cx,
+ STRING_LIT_AS_BYTES,
+ e.span,
+ "calling `as_bytes()` on `include_str!(..)`",
+ "consider using `include_bytes!(..)` instead",
+ snippet_with_applicability(cx, args[0].span, r#""foo""#, &mut applicability).replacen(
+ "include_str",
+ "include_bytes",
+ 1,
+ ),
+ applicability,
+ );
+ } else if lit_content.as_str().is_ascii()
+ && lit_content.as_str().len() <= MAX_LENGTH_BYTE_STRING_LIT
+ && !args[0].span.from_expansion()
+ {
+ span_lint_and_sugg(
+ cx,
+ STRING_LIT_AS_BYTES,
+ e.span,
+ "calling `as_bytes()` on a string literal",
+ "consider using a byte string literal instead",
+ format!(
+ "b{}",
+ snippet_with_applicability(cx, args[0].span, r#""foo""#, &mut applicability)
+ ),
+ applicability,
+ );
+ }
+ }
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, [recv], _) = &e.kind;
+ if path.ident.name == sym!(into_bytes);
+ if let ExprKind::MethodCall(path, [recv], _) = &recv.kind;
+ if matches!(path.ident.name.as_str(), "to_owned" | "to_string");
+ if let ExprKind::Lit(lit) = &recv.kind;
+ if let LitKind::Str(lit_content, _) = &lit.node;
+
+ if lit_content.as_str().is_ascii();
+ if lit_content.as_str().len() <= MAX_LENGTH_BYTE_STRING_LIT;
+ if !recv.span.from_expansion();
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+
+ span_lint_and_sugg(
+ cx,
+ STRING_LIT_AS_BYTES,
+ e.span,
+ "calling `into_bytes()` on a string literal",
+ "consider using a byte string literal instead",
+ format!(
+ "b{}.to_vec()",
+ snippet_with_applicability(cx, recv.span, r#""..""#, &mut applicability)
+ ),
+ applicability,
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for `.to_string()` method calls on values of type `&str`.
+ ///
+ /// ### Why is this bad?
+ /// The `to_string` method is also used on other types to convert them to a string.
+ /// When called on a `&str` it turns the `&str` into the owned variant `String`, which can be better
+ /// expressed with `.to_owned()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let _ = "str".to_string();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// // example code which does not raise clippy warning
+ /// let _ = "str".to_owned();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STR_TO_STRING,
+ restriction,
+ "using `to_string()` on a `&str`, which should be `to_owned()`"
+}
+
+declare_lint_pass!(StrToString => [STR_TO_STRING]);
+
+impl<'tcx> LateLintPass<'tcx> for StrToString {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ if_chain! {
+ if let ExprKind::MethodCall(path, [self_arg, ..], _) = &expr.kind;
- if path.ident.name == sym!(to_string);
++ if path.ident.name == sym::to_string;
+ let ty = cx.typeck_results().expr_ty(self_arg);
+ if let ty::Ref(_, ty, ..) = ty.kind();
+ if *ty.kind() == ty::Str;
+ then {
+ span_lint_and_help(
+ cx,
+ STR_TO_STRING,
+ expr.span,
+ "`to_string()` called on a `&str`",
+ None,
+ "consider using `.to_owned()`",
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for `.to_string()` method calls on values of type `String`.
+ ///
+ /// ### Why is this bad?
+ /// The `to_string` method is also used on other types to convert them to a string.
+ /// When called on a `String` it only clones the `String`, which can be better expressed with `.clone()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let msg = String::from("Hello World");
+ /// let _ = msg.to_string();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// // example code which does not raise clippy warning
+ /// let msg = String::from("Hello World");
+ /// let _ = msg.clone();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_TO_STRING,
+ restriction,
+ "using `to_string()` on a `String`, which should be `clone()`"
+}
+
+declare_lint_pass!(StringToString => [STRING_TO_STRING]);
+
+impl<'tcx> LateLintPass<'tcx> for StringToString {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ if_chain! {
+ if let ExprKind::MethodCall(path, [self_arg, ..], _) = &expr.kind;
++ if path.ident.name == sym::to_string;
+ let ty = cx.typeck_results().expr_ty(self_arg);
+ if is_type_diagnostic_item(cx, ty, sym::String);
+ then {
+ span_lint_and_help(
+ cx,
+ STRING_TO_STRING,
+ expr.span,
+ "`to_string()` called on a `String`",
+ None,
+ "consider using `.clone()`",
+ );
+ }
+ }
+ }
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns about calling `str::trim` (or variants) before `str::split_whitespace`.
+ ///
+ /// ### Why is this bad?
+ /// `split_whitespace` already ignores leading and trailing whitespace.
+ ///
+ /// ### Example
+ /// ```rust
+ /// " A B C ".trim().split_whitespace();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// " A B C ".split_whitespace();
+ /// ```
+ #[clippy::version = "1.62.0"]
+ pub TRIM_SPLIT_WHITESPACE,
+ style,
+ "using `str::trim()` or alike before `str::split_whitespace`"
+}
+declare_lint_pass!(TrimSplitWhitespace => [TRIM_SPLIT_WHITESPACE]);
+
+impl<'tcx> LateLintPass<'tcx> for TrimSplitWhitespace {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ let tyckres = cx.typeck_results();
+ if_chain! {
+ if let ExprKind::MethodCall(path, [split_recv], split_ws_span) = expr.kind;
+ if path.ident.name == sym!(split_whitespace);
+ if let Some(split_ws_def_id) = tyckres.type_dependent_def_id(expr.hir_id);
+ if cx.tcx.is_diagnostic_item(sym::str_split_whitespace, split_ws_def_id);
+ if let ExprKind::MethodCall(path, [_trim_recv], trim_span) = split_recv.kind;
+ if let trim_fn_name @ ("trim" | "trim_start" | "trim_end") = path.ident.name.as_str();
+ if let Some(trim_def_id) = tyckres.type_dependent_def_id(split_recv.hir_id);
+ if is_one_of_trim_diagnostic_items(cx, trim_def_id);
+ then {
+ span_lint_and_sugg(
+ cx,
+ TRIM_SPLIT_WHITESPACE,
+ trim_span.with_hi(split_ws_span.lo()),
+ &format!("found call to `str::{}` before `str::split_whitespace`", trim_fn_name),
+ &format!("remove `{}()`", trim_fn_name),
+ String::new(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+fn is_one_of_trim_diagnostic_items(cx: &LateContext<'_>, trim_def_id: DefId) -> bool {
+ cx.tcx.is_diagnostic_item(sym::str_trim, trim_def_id)
+ || cx.tcx.is_diagnostic_item(sym::str_trim_start, trim_def_id)
+ || cx.tcx.is_diagnostic_item(sym::str_trim_end, trim_def_id)
+}
--- /dev/null
- use rustc_session::{declare_lint_pass, declare_tool_lint};
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::visitors::is_local_used;
+use if_chain::if_chain;
+use rustc_hir::{Impl, ImplItem, ImplItemKind, ItemKind};
+use rustc_lint::{LateContext, LateLintPass};
- declare_lint_pass!(UnusedSelf => [UNUSED_SELF]);
++use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+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());
+ let parent_item = cx.tcx.hir().expect_item(parent);
+ let assoc_item = cx.tcx.associated_item(impl_item.def_id);
+ 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.access_levels.is_exported(impl_item.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);
+ then {
+ span_lint_and_help(
+ cx,
+ UNUSED_SELF,
+ self_param.span,
+ "unused `self` argument",
+ None,
+ "consider refactoring to a associated function",
+ );
+ }
+ }
+ }
+}
--- /dev/null
- /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX.
+//! Read configurations files.
+
+#![allow(clippy::module_name_repetitions)]
+
+use serde::de::{Deserializer, IgnoredAny, IntoDeserializer, MapAccess, Visitor};
+use serde::Deserialize;
+use std::error::Error;
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+use std::{cmp, env, fmt, fs, io, iter};
+
+#[rustfmt::skip]
+const DEFAULT_DOC_VALID_IDENTS: &[&str] = &[
+ "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
+ "DirectX",
+ "ECMAScript",
+ "GPLv2", "GPLv3",
+ "GitHub", "GitLab",
+ "IPv4", "IPv6",
+ "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript",
+ "NaN", "NaNs",
+ "OAuth", "GraphQL",
+ "OCaml",
+ "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenDNS",
+ "WebGL",
+ "TensorFlow",
+ "TrueType",
+ "iOS", "macOS", "FreeBSD",
+ "TeX", "LaTeX", "BibTeX", "BibLaTeX",
+ "MinGW",
+ "CamelCase",
+];
+const DEFAULT_BLACKLISTED_NAMES: &[&str] = &["foo", "baz", "quux"];
+
+/// Holds information used by `MISSING_ENFORCED_IMPORT_RENAMES` lint.
+#[derive(Clone, Debug, Deserialize)]
+pub struct Rename {
+ pub path: String,
+ pub rename: String,
+}
+
+/// A single disallowed method, used by the `DISALLOWED_METHODS` lint.
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DisallowedMethod {
+ Simple(String),
+ WithReason { path: String, reason: Option<String> },
+}
+
+impl DisallowedMethod {
+ pub fn path(&self) -> &str {
+ let (Self::Simple(path) | Self::WithReason { path, .. }) = self;
+
+ path
+ }
+}
+
+/// A single disallowed type, used by the `DISALLOWED_TYPES` lint.
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DisallowedType {
+ Simple(String),
+ WithReason { path: String, reason: Option<String> },
+}
+
+/// Conf with parse errors
+#[derive(Default)]
+pub struct TryConf {
+ pub conf: Conf,
+ pub errors: Vec<Box<dyn Error>>,
+}
+
+impl TryConf {
+ fn from_error(error: impl Error + 'static) -> Self {
+ Self {
+ conf: Conf::default(),
+ errors: vec![Box::new(error)],
+ }
+ }
+}
+
+#[derive(Debug)]
+struct ConfError(String);
+
+impl fmt::Display for ConfError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ <String as fmt::Display>::fmt(&self.0, f)
+ }
+}
+
+impl Error for ConfError {}
+
+fn conf_error(s: String) -> Box<dyn Error> {
+ Box::new(ConfError(s))
+}
+
+macro_rules! define_Conf {
+ ($(
+ $(#[doc = $doc:literal])+
+ $(#[conf_deprecated($dep:literal)])?
+ ($name:ident: $ty:ty = $default:expr),
+ )*) => {
+ /// Clippy lint configuration
+ pub struct Conf {
+ $($(#[doc = $doc])+ pub $name: $ty,)*
+ }
+
+ mod defaults {
+ $(pub fn $name() -> $ty { $default })*
+ }
+
+ impl Default for Conf {
+ fn default() -> Self {
+ Self { $($name: defaults::$name(),)* }
+ }
+ }
+
+ impl<'de> Deserialize<'de> for TryConf {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
+ deserializer.deserialize_map(ConfVisitor)
+ }
+ }
+
+ #[derive(Deserialize)]
+ #[serde(field_identifier, rename_all = "kebab-case")]
+ #[allow(non_camel_case_types)]
+ enum Field { $($name,)* third_party, }
+
+ struct ConfVisitor;
+
+ impl<'de> Visitor<'de> for ConfVisitor {
+ type Value = TryConf;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ formatter.write_str("Conf")
+ }
+
+ fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error> where V: MapAccess<'de> {
+ let mut errors = Vec::new();
+ $(let mut $name = None;)*
+ // could get `Field` here directly, but get `str` first for diagnostics
+ while let Some(name) = map.next_key::<&str>()? {
+ match Field::deserialize(name.into_deserializer())? {
+ $(Field::$name => {
+ $(errors.push(conf_error(format!("deprecated field `{}`. {}", name, $dep)));)?
+ match map.next_value() {
+ Err(e) => errors.push(conf_error(e.to_string())),
+ Ok(value) => match $name {
+ Some(_) => errors.push(conf_error(format!("duplicate field `{}`", name))),
+ None => $name = Some(value),
+ }
+ }
+ })*
+ // white-listed; ignore
+ Field::third_party => drop(map.next_value::<IgnoredAny>())
+ }
+ }
+ let conf = Conf { $($name: $name.unwrap_or_else(defaults::$name),)* };
+ Ok(TryConf { conf, errors })
+ }
+ }
+
+ #[cfg(feature = "internal")]
+ pub mod metadata {
+ use crate::utils::internal_lints::metadata_collector::ClippyConfiguration;
+
+ macro_rules! wrap_option {
+ () => (None);
+ ($x:literal) => (Some($x));
+ }
+
+ pub(crate) fn get_configuration_metadata() -> Vec<ClippyConfiguration> {
+ vec![
+ $(
+ {
+ let deprecation_reason = wrap_option!($($dep)?);
+
+ ClippyConfiguration::new(
+ stringify!($name),
+ stringify!($ty),
+ format!("{:?}", super::defaults::$name()),
+ concat!($($doc, '\n',)*),
+ deprecation_reason,
+ )
+ },
+ )+
+ ]
+ }
+ }
+ };
+}
+
+define_Conf! {
++ /// Lint: Arithmetic.
++ ///
++ /// Suppress checking of the passed type names.
++ (arithmetic_allowed: rustc_data_structures::fx::FxHashSet<String> = <_>::default()),
++ /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UNUSED_SELF, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX.
+ ///
+ /// Suppress lints whenever the suggested change would cause breakage for other crates.
+ (avoid_breaking_exported_api: bool = true),
+ /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS, ERR_EXPECT, CAST_ABS_TO_UNSIGNED.
+ ///
+ /// The minimum rust version that the project supports
+ (msrv: Option<String> = None),
+ /// Lint: BLACKLISTED_NAME.
+ ///
+ /// The list of blacklisted names to lint about. NB: `bar` is not here since it has legitimate uses. The value
+ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
+ /// default configuration of Clippy. By default any configuraction will replace the default value.
+ (blacklisted_names: Vec<String> = super::DEFAULT_BLACKLISTED_NAMES.iter().map(ToString::to_string).collect()),
+ /// Lint: COGNITIVE_COMPLEXITY.
+ ///
+ /// The maximum cognitive complexity a function can have
+ (cognitive_complexity_threshold: u64 = 25),
+ /// DEPRECATED LINT: CYCLOMATIC_COMPLEXITY.
+ ///
+ /// Use the Cognitive Complexity lint instead.
+ #[conf_deprecated("Please use `cognitive-complexity-threshold` instead")]
+ (cyclomatic_complexity_threshold: Option<u64> = None),
+ /// Lint: DOC_MARKDOWN.
+ ///
+ /// The list of words this lint should not consider as identifiers needing ticks. The value
+ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
+ /// default configuration of Clippy. By default any configuraction will replace the default value. For example:
+ /// * `doc-valid-idents = ["ClipPy"]` would replace the default list with `["ClipPy"]`.
+ /// * `doc-valid-idents = ["ClipPy", ".."]` would append `ClipPy` to the default list.
+ ///
+ /// Default list:
+ (doc_valid_idents: Vec<String> = super::DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string).collect()),
+ /// Lint: TOO_MANY_ARGUMENTS.
+ ///
+ /// The maximum number of argument a function or method can have
+ (too_many_arguments_threshold: u64 = 7),
+ /// Lint: TYPE_COMPLEXITY.
+ ///
+ /// The maximum complexity a type can have
+ (type_complexity_threshold: u64 = 250),
+ /// Lint: MANY_SINGLE_CHAR_NAMES.
+ ///
+ /// The maximum number of single char bindings a scope may have
+ (single_char_binding_names_threshold: u64 = 4),
+ /// Lint: BOXED_LOCAL, USELESS_VEC.
+ ///
+ /// The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
+ (too_large_for_stack: u64 = 200),
+ /// Lint: ENUM_VARIANT_NAMES.
+ ///
+ /// The minimum number of enum variants for the lints about variant names to trigger
+ (enum_variant_name_threshold: u64 = 3),
+ /// Lint: LARGE_ENUM_VARIANT.
+ ///
+ /// The maximum size of an enum's variant to avoid box suggestion
+ (enum_variant_size_threshold: u64 = 200),
+ /// Lint: VERBOSE_BIT_MASK.
+ ///
+ /// The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
+ (verbose_bit_mask_threshold: u64 = 1),
+ /// Lint: DECIMAL_LITERAL_REPRESENTATION.
+ ///
+ /// The lower bound for linting decimal literals
+ (literal_representation_threshold: u64 = 16384),
+ /// Lint: TRIVIALLY_COPY_PASS_BY_REF.
+ ///
+ /// The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
+ (trivial_copy_size_limit: Option<u64> = None),
+ /// Lint: LARGE_TYPE_PASS_BY_MOVE.
+ ///
+ /// The minimum size (in bytes) to consider a type for passing by reference instead of by value.
+ (pass_by_value_size_limit: u64 = 256),
+ /// Lint: TOO_MANY_LINES.
+ ///
+ /// The maximum number of lines a function or method can have
+ (too_many_lines_threshold: u64 = 100),
+ /// Lint: LARGE_STACK_ARRAYS, LARGE_CONST_ARRAYS.
+ ///
+ /// The maximum allowed size for arrays on the stack
+ (array_size_threshold: u64 = 512_000),
+ /// Lint: VEC_BOX.
+ ///
+ /// The size of the boxed type in bytes, where boxing in a `Vec` is allowed
+ (vec_box_size_threshold: u64 = 4096),
+ /// Lint: TYPE_REPETITION_IN_BOUNDS.
+ ///
+ /// The maximum number of bounds a trait can have to be linted
+ (max_trait_bounds: u64 = 3),
+ /// Lint: STRUCT_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool fields a struct can have
+ (max_struct_bools: u64 = 3),
+ /// Lint: FN_PARAMS_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool parameters a function can have
+ (max_fn_params_bools: u64 = 3),
+ /// Lint: WILDCARD_IMPORTS.
+ ///
+ /// Whether to allow certain wildcard imports (prelude, super in tests).
+ (warn_on_all_wildcard_imports: bool = false),
+ /// Lint: DISALLOWED_METHODS.
+ ///
+ /// The list of disallowed methods, written as fully qualified paths.
+ (disallowed_methods: Vec<crate::utils::conf::DisallowedMethod> = Vec::new()),
+ /// Lint: DISALLOWED_TYPES.
+ ///
+ /// The list of disallowed types, written as fully qualified paths.
+ (disallowed_types: Vec<crate::utils::conf::DisallowedType> = Vec::new()),
+ /// Lint: UNREADABLE_LITERAL.
+ ///
+ /// Should the fraction of a decimal be linted to include separators.
+ (unreadable_literal_lint_fractions: bool = true),
+ /// Lint: UPPER_CASE_ACRONYMS.
+ ///
+ /// Enables verbose mode. Triggers if there is more than one uppercase char next to each other
+ (upper_case_acronyms_aggressive: bool = false),
+ /// Lint: _CARGO_COMMON_METADATA.
+ ///
+ /// For internal testing only, ignores the current `publish` settings in the Cargo manifest.
+ (cargo_ignore_publish: bool = false),
+ /// Lint: NONSTANDARD_MACRO_BRACES.
+ ///
+ /// Enforce the named macros always use the braces specified.
+ ///
+ /// A `MacroMatcher` can be added like so `{ name = "macro_name", brace = "(" }`. If the macro
+ /// is could be used with a full path two `MacroMatcher`s have to be added one with the full path
+ /// `crate_name::macro_name` and one with just the macro name.
+ (standard_macro_braces: Vec<crate::nonstandard_macro_braces::MacroMatcher> = Vec::new()),
+ /// Lint: MISSING_ENFORCED_IMPORT_RENAMES.
+ ///
+ /// The list of imports to always rename, a fully qualified path followed by the rename.
+ (enforced_import_renames: Vec<crate::utils::conf::Rename> = Vec::new()),
+ /// Lint: DISALLOWED_SCRIPT_IDENTS.
+ ///
+ /// The list of unicode scripts allowed to be used in the scope.
+ (allowed_scripts: Vec<String> = ["Latin"].iter().map(ToString::to_string).collect()),
+ /// Lint: NON_SEND_FIELDS_IN_SEND_TY.
+ ///
+ /// Whether to apply the raw pointer heuristic to determine if a type is `Send`.
+ (enable_raw_pointer_heuristic_for_send: bool = true),
+ /// Lint: INDEX_REFUTABLE_SLICE.
+ ///
+ /// When Clippy suggests using a slice pattern, this is the maximum number of elements allowed in
+ /// the slice pattern that is suggested. If more elements would be necessary, the lint is suppressed.
+ /// For example, `[_, _, _, e, ..]` is a slice pattern with 4 elements.
+ (max_suggested_slice_pattern_length: u64 = 3),
+ /// Lint: AWAIT_HOLDING_INVALID_TYPE
+ (await_holding_invalid_types: Vec<crate::utils::conf::DisallowedType> = Vec::new()),
+ /// Lint: LARGE_INCLUDE_FILE.
+ ///
+ /// The maximum size of a file included via `include_bytes!()` or `include_str!()`, in bytes
+ (max_include_file_size: u64 = 1_000_000),
+ /// Lint: EXPECT_USED.
+ ///
+ /// Whether `expect` should be allowed in test functions
+ (allow_expect_in_tests: bool = false),
+ /// Lint: UNWRAP_USED.
+ ///
+ /// Whether `unwrap` should be allowed in test functions
+ (allow_unwrap_in_tests: bool = false),
+ /// Lint: DBG_MACRO.
+ ///
+ /// Whether `dbg!` should be allowed in test functions
+ (allow_dbg_in_tests: bool = false),
+}
+
+/// Search for the configuration file.
+pub fn lookup_conf_file() -> io::Result<Option<PathBuf>> {
+ /// Possible filename to search for.
+ const CONFIG_FILE_NAMES: [&str; 2] = [".clippy.toml", "clippy.toml"];
+
+ // Start looking for a config file in CLIPPY_CONF_DIR, or failing that, CARGO_MANIFEST_DIR.
+ // If neither of those exist, use ".".
+ let mut current = env::var_os("CLIPPY_CONF_DIR")
+ .or_else(|| env::var_os("CARGO_MANIFEST_DIR"))
+ .map_or_else(|| PathBuf::from("."), PathBuf::from);
+
+ let mut found_config: Option<PathBuf> = None;
+
+ loop {
+ for config_file_name in &CONFIG_FILE_NAMES {
+ if let Ok(config_file) = current.join(config_file_name).canonicalize() {
+ match fs::metadata(&config_file) {
+ Err(e) if e.kind() == io::ErrorKind::NotFound => {},
+ Err(e) => return Err(e),
+ Ok(md) if md.is_dir() => {},
+ Ok(_) => {
+ // warn if we happen to find two config files #8323
+ if let Some(ref found_config_) = found_config {
+ eprintln!(
+ "Using config file `{}`\nWarning: `{}` will be ignored.",
+ found_config_.display(),
+ config_file.display(),
+ );
+ } else {
+ found_config = Some(config_file);
+ }
+ },
+ }
+ }
+ }
+
+ if found_config.is_some() {
+ return Ok(found_config);
+ }
+
+ // If the current directory has no parent, we're done searching.
+ if !current.pop() {
+ return Ok(None);
+ }
+ }
+}
+
+/// Read the `toml` configuration file.
+///
+/// In case of error, the function tries to continue as much as possible.
+pub fn read(path: &Path) -> TryConf {
+ let content = match fs::read_to_string(path) {
+ Err(e) => return TryConf::from_error(e),
+ Ok(content) => content,
+ };
+ match toml::from_str::<TryConf>(&content) {
+ Ok(mut conf) => {
+ extend_vec_if_indicator_present(&mut conf.conf.doc_valid_idents, DEFAULT_DOC_VALID_IDENTS);
+ extend_vec_if_indicator_present(&mut conf.conf.blacklisted_names, DEFAULT_BLACKLISTED_NAMES);
+
+ conf
+ },
+ Err(e) => TryConf::from_error(e),
+ }
+}
+
+fn extend_vec_if_indicator_present(vec: &mut Vec<String>, default: &[&str]) {
+ if vec.contains(&"..".to_string()) {
+ vec.extend(default.iter().map(ToString::to_string));
+ }
+}
+
+const SEPARATOR_WIDTH: usize = 4;
+
+// Check whether the error is "unknown field" and, if so, list the available fields sorted and at
+// least one per line, more if `CLIPPY_TERMINAL_WIDTH` is set and allows it.
+pub fn format_error(error: Box<dyn Error>) -> String {
+ let s = error.to_string();
+
+ if_chain! {
+ if error.downcast::<toml::de::Error>().is_ok();
+ if let Some((prefix, mut fields, suffix)) = parse_unknown_field_message(&s);
+ then {
+ use fmt::Write;
+
+ fields.sort_unstable();
+
+ let (rows, column_widths) = calculate_dimensions(&fields);
+
+ let mut msg = String::from(prefix);
+ for row in 0..rows {
+ write!(msg, "\n").unwrap();
+ for (column, column_width) in column_widths.iter().copied().enumerate() {
+ let index = column * rows + row;
+ let field = fields.get(index).copied().unwrap_or_default();
+ write!(
+ msg,
+ "{:separator_width$}{:field_width$}",
+ " ",
+ field,
+ separator_width = SEPARATOR_WIDTH,
+ field_width = column_width
+ )
+ .unwrap();
+ }
+ }
+ write!(msg, "\n{}", suffix).unwrap();
+ msg
+ } else {
+ s
+ }
+ }
+}
+
+// `parse_unknown_field_message` will become unnecessary if
+// https://github.com/alexcrichton/toml-rs/pull/364 is merged.
+fn parse_unknown_field_message(s: &str) -> Option<(&str, Vec<&str>, &str)> {
+ // An "unknown field" message has the following form:
+ // unknown field `UNKNOWN`, expected one of `FIELD0`, `FIELD1`, ..., `FIELDN` at line X column Y
+ // ^^ ^^^^ ^^
+ if_chain! {
+ if s.starts_with("unknown field");
+ let slices = s.split("`, `").collect::<Vec<_>>();
+ let n = slices.len();
+ if n >= 2;
+ if let Some((prefix, first_field)) = slices[0].rsplit_once(" `");
+ if let Some((last_field, suffix)) = slices[n - 1].split_once("` ");
+ then {
+ let fields = iter::once(first_field)
+ .chain(slices[1..n - 1].iter().copied())
+ .chain(iter::once(last_field))
+ .collect::<Vec<_>>();
+ Some((prefix, fields, suffix))
+ } else {
+ None
+ }
+ }
+}
+
+fn calculate_dimensions(fields: &[&str]) -> (usize, Vec<usize>) {
+ let columns = env::var("CLIPPY_TERMINAL_WIDTH")
+ .ok()
+ .and_then(|s| <usize as FromStr>::from_str(&s).ok())
+ .map_or(1, |terminal_width| {
+ let max_field_width = fields.iter().map(|field| field.len()).max().unwrap();
+ cmp::max(1, terminal_width / (SEPARATOR_WIDTH + max_field_width))
+ });
+
+ let rows = (fields.len() + (columns - 1)) / columns;
+
+ let column_widths = (0..columns)
+ .map(|column| {
+ if column < columns - 1 {
+ (0..rows)
+ .map(|row| {
+ let index = column * rows + row;
+ let field = fields.get(index).copied().unwrap_or_default();
+ field.len()
+ })
+ .max()
+ .unwrap()
+ } else {
+ // Avoid adding extra space to the last column.
+ 0
+ }
+ })
+ .collect::<Vec<_>>();
+
+ (rows, column_widths)
+}
--- /dev/null
- ty::Float(FloatTy::F32) => match len.to_valtree().try_to_machine_usize(tcx) {
+#![allow(clippy::float_cmp)]
+
+use crate::{clip, is_direct_expn_of, sext, unsext};
+use if_chain::if_chain;
+use rustc_ast::ast::{self, LitFloatType, LitKind};
+use rustc_data_structures::sync::Lrc;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::{BinOp, BinOpKind, Block, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp};
+use rustc_lint::LateContext;
+use rustc_middle::mir;
+use rustc_middle::mir::interpret::Scalar;
+use rustc_middle::ty::subst::{Subst, SubstsRef};
+use rustc_middle::ty::{self, EarlyBinder, FloatTy, ScalarInt, Ty, TyCtxt};
+use rustc_middle::{bug, span_bug};
+use rustc_span::symbol::Symbol;
+use std::cmp::Ordering::{self, Equal};
+use std::hash::{Hash, Hasher};
+use std::iter;
+
+/// A `LitKind`-like enum to fold constant `Expr`s into.
+#[derive(Debug, Clone)]
+pub enum Constant {
+ /// A `String` (e.g., "abc").
+ Str(String),
+ /// A binary string (e.g., `b"abc"`).
+ Binary(Lrc<[u8]>),
+ /// A single `char` (e.g., `'a'`).
+ Char(char),
+ /// An integer's bit representation.
+ Int(u128),
+ /// An `f32`.
+ F32(f32),
+ /// An `f64`.
+ F64(f64),
+ /// `true` or `false`.
+ Bool(bool),
+ /// An array of constants.
+ Vec(Vec<Constant>),
+ /// Also an array, but with only one constant, repeated N times.
+ Repeat(Box<Constant>, u64),
+ /// A tuple of constants.
+ Tuple(Vec<Constant>),
+ /// A raw pointer.
+ RawPtr(u128),
+ /// A reference
+ Ref(Box<Constant>),
+ /// A literal with syntax error.
+ Err(Symbol),
+}
+
+impl PartialEq for Constant {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (&Self::Str(ref ls), &Self::Str(ref rs)) => ls == rs,
+ (&Self::Binary(ref l), &Self::Binary(ref r)) => l == r,
+ (&Self::Char(l), &Self::Char(r)) => l == r,
+ (&Self::Int(l), &Self::Int(r)) => l == r,
+ (&Self::F64(l), &Self::F64(r)) => {
+ // We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
+ // `Fw32 == Fw64`, so don’t compare them.
+ // `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
+ l.to_bits() == r.to_bits()
+ },
+ (&Self::F32(l), &Self::F32(r)) => {
+ // We want `Fw32 == FwAny` and `FwAny == Fw64`, and by transitivity we must have
+ // `Fw32 == Fw64`, so don’t compare them.
+ // `to_bits` is required to catch non-matching 0.0, -0.0, and NaNs.
+ f64::from(l).to_bits() == f64::from(r).to_bits()
+ },
+ (&Self::Bool(l), &Self::Bool(r)) => l == r,
+ (&Self::Vec(ref l), &Self::Vec(ref r)) | (&Self::Tuple(ref l), &Self::Tuple(ref r)) => l == r,
+ (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => ls == rs && lv == rv,
+ (&Self::Ref(ref lb), &Self::Ref(ref rb)) => *lb == *rb,
+ // TODO: are there inter-type equalities?
+ _ => false,
+ }
+ }
+}
+
+impl Hash for Constant {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ std::mem::discriminant(self).hash(state);
+ match *self {
+ Self::Str(ref s) => {
+ s.hash(state);
+ },
+ Self::Binary(ref b) => {
+ b.hash(state);
+ },
+ Self::Char(c) => {
+ c.hash(state);
+ },
+ Self::Int(i) => {
+ i.hash(state);
+ },
+ Self::F32(f) => {
+ f64::from(f).to_bits().hash(state);
+ },
+ Self::F64(f) => {
+ f.to_bits().hash(state);
+ },
+ Self::Bool(b) => {
+ b.hash(state);
+ },
+ Self::Vec(ref v) | Self::Tuple(ref v) => {
+ v.hash(state);
+ },
+ Self::Repeat(ref c, l) => {
+ c.hash(state);
+ l.hash(state);
+ },
+ Self::RawPtr(u) => {
+ u.hash(state);
+ },
+ Self::Ref(ref r) => {
+ r.hash(state);
+ },
+ Self::Err(ref s) => {
+ s.hash(state);
+ },
+ }
+ }
+}
+
+impl Constant {
+ pub fn partial_cmp(tcx: TyCtxt<'_>, cmp_type: Ty<'_>, left: &Self, right: &Self) -> Option<Ordering> {
+ match (left, right) {
+ (&Self::Str(ref ls), &Self::Str(ref rs)) => Some(ls.cmp(rs)),
+ (&Self::Char(ref l), &Self::Char(ref r)) => Some(l.cmp(r)),
+ (&Self::Int(l), &Self::Int(r)) => match *cmp_type.kind() {
+ ty::Int(int_ty) => Some(sext(tcx, l, int_ty).cmp(&sext(tcx, r, int_ty))),
+ ty::Uint(_) => Some(l.cmp(&r)),
+ _ => bug!("Not an int type"),
+ },
+ (&Self::F64(l), &Self::F64(r)) => l.partial_cmp(&r),
+ (&Self::F32(l), &Self::F32(r)) => l.partial_cmp(&r),
+ (&Self::Bool(ref l), &Self::Bool(ref r)) => Some(l.cmp(r)),
+ (&Self::Tuple(ref l), &Self::Tuple(ref r)) | (&Self::Vec(ref l), &Self::Vec(ref r)) => iter::zip(l, r)
+ .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
+ .find(|r| r.map_or(true, |o| o != Ordering::Equal))
+ .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
+ (&Self::Repeat(ref lv, ref ls), &Self::Repeat(ref rv, ref rs)) => {
+ match Self::partial_cmp(tcx, cmp_type, lv, rv) {
+ Some(Equal) => Some(ls.cmp(rs)),
+ x => x,
+ }
+ },
+ (&Self::Ref(ref lb), &Self::Ref(ref rb)) => Self::partial_cmp(tcx, cmp_type, lb, rb),
+ // TODO: are there any useful inter-type orderings?
+ _ => None,
+ }
+ }
+
+ /// Returns the integer value or `None` if `self` or `val_type` is not integer type.
+ pub fn int_value(&self, cx: &LateContext<'_>, val_type: Ty<'_>) -> Option<FullInt> {
+ if let Constant::Int(const_int) = *self {
+ match *val_type.kind() {
+ ty::Int(ity) => Some(FullInt::S(sext(cx.tcx, const_int, ity))),
+ ty::Uint(_) => Some(FullInt::U(const_int)),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ }
+
+ #[must_use]
+ pub fn peel_refs(mut self) -> Self {
+ while let Constant::Ref(r) = self {
+ self = *r;
+ }
+ self
+ }
+}
+
+/// Parses a `LitKind` to a `Constant`.
+pub fn lit_to_mir_constant(lit: &LitKind, ty: Option<Ty<'_>>) -> Constant {
+ match *lit {
+ LitKind::Str(ref is, _) => Constant::Str(is.to_string()),
+ LitKind::Byte(b) => Constant::Int(u128::from(b)),
+ LitKind::ByteStr(ref s) => Constant::Binary(Lrc::clone(s)),
+ LitKind::Char(c) => Constant::Char(c),
+ LitKind::Int(n, _) => Constant::Int(n),
+ LitKind::Float(ref is, LitFloatType::Suffixed(fty)) => match fty {
+ ast::FloatTy::F32 => Constant::F32(is.as_str().parse().unwrap()),
+ ast::FloatTy::F64 => Constant::F64(is.as_str().parse().unwrap()),
+ },
+ LitKind::Float(ref is, LitFloatType::Unsuffixed) => match ty.expect("type of float is known").kind() {
+ ty::Float(FloatTy::F32) => Constant::F32(is.as_str().parse().unwrap()),
+ ty::Float(FloatTy::F64) => Constant::F64(is.as_str().parse().unwrap()),
+ _ => bug!(),
+ },
+ LitKind::Bool(b) => Constant::Bool(b),
+ LitKind::Err(s) => Constant::Err(s),
+ }
+}
+
+pub fn constant<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<(Constant, bool)> {
+ let mut cx = ConstEvalLateContext {
+ lcx,
+ typeck_results,
+ param_env: lcx.param_env,
+ needed_resolution: false,
+ substs: lcx.tcx.intern_substs(&[]),
+ };
+ cx.expr(e).map(|cst| (cst, cx.needed_resolution))
+}
+
+pub fn constant_simple<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<Constant> {
+ constant(lcx, typeck_results, e).and_then(|(cst, res)| if res { None } else { Some(cst) })
+}
+
+pub fn constant_full_int<'tcx>(
+ lcx: &LateContext<'tcx>,
+ typeck_results: &ty::TypeckResults<'tcx>,
+ e: &Expr<'_>,
+) -> Option<FullInt> {
+ constant_simple(lcx, typeck_results, e)?.int_value(lcx, typeck_results.expr_ty(e))
+}
+
+#[derive(Copy, Clone, Debug, Eq)]
+pub enum FullInt {
+ S(i128),
+ U(u128),
+}
+
+impl PartialEq for FullInt {
+ #[must_use]
+ fn eq(&self, other: &Self) -> bool {
+ self.cmp(other) == Ordering::Equal
+ }
+}
+
+impl PartialOrd for FullInt {
+ #[must_use]
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+impl Ord for FullInt {
+ #[must_use]
+ fn cmp(&self, other: &Self) -> Ordering {
+ use FullInt::{S, U};
+
+ fn cmp_s_u(s: i128, u: u128) -> Ordering {
+ u128::try_from(s).map_or(Ordering::Less, |x| x.cmp(&u))
+ }
+
+ match (*self, *other) {
+ (S(s), S(o)) => s.cmp(&o),
+ (U(s), U(o)) => s.cmp(&o),
+ (S(s), U(o)) => cmp_s_u(s, o),
+ (U(s), S(o)) => cmp_s_u(o, s).reverse(),
+ }
+ }
+}
+
+/// Creates a `ConstEvalLateContext` from the given `LateContext` and `TypeckResults`.
+pub fn constant_context<'a, 'tcx>(
+ lcx: &'a LateContext<'tcx>,
+ typeck_results: &'a ty::TypeckResults<'tcx>,
+) -> ConstEvalLateContext<'a, 'tcx> {
+ ConstEvalLateContext {
+ lcx,
+ typeck_results,
+ param_env: lcx.param_env,
+ needed_resolution: false,
+ substs: lcx.tcx.intern_substs(&[]),
+ }
+}
+
+pub struct ConstEvalLateContext<'a, 'tcx> {
+ lcx: &'a LateContext<'tcx>,
+ typeck_results: &'a ty::TypeckResults<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ needed_resolution: bool,
+ substs: SubstsRef<'tcx>,
+}
+
+impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
+ /// Simple constant folding: Insert an expression, get a constant or none.
+ pub fn expr(&mut self, e: &Expr<'_>) -> Option<Constant> {
+ match e.kind {
+ ExprKind::Path(ref qpath) => self.fetch_path(qpath, e.hir_id, self.typeck_results.expr_ty(e)),
+ ExprKind::Block(block, _) => self.block(block),
+ ExprKind::Lit(ref lit) => {
+ if is_direct_expn_of(e.span, "cfg").is_some() {
+ None
+ } else {
+ Some(lit_to_mir_constant(&lit.node, self.typeck_results.expr_ty_opt(e)))
+ }
+ },
+ ExprKind::Array(vec) => self.multi(vec).map(Constant::Vec),
+ ExprKind::Tup(tup) => self.multi(tup).map(Constant::Tuple),
+ ExprKind::Repeat(value, _) => {
+ let n = match self.typeck_results.expr_ty(e).kind() {
+ ty::Array(_, n) => n.try_eval_usize(self.lcx.tcx, self.lcx.param_env)?,
+ _ => span_bug!(e.span, "typeck error"),
+ };
+ self.expr(value).map(|v| Constant::Repeat(Box::new(v), n))
+ },
+ ExprKind::Unary(op, operand) => self.expr(operand).and_then(|o| match op {
+ UnOp::Not => self.constant_not(&o, self.typeck_results.expr_ty(e)),
+ UnOp::Neg => self.constant_negate(&o, self.typeck_results.expr_ty(e)),
+ UnOp::Deref => Some(if let Constant::Ref(r) = o { *r } else { o }),
+ }),
+ ExprKind::If(cond, then, ref otherwise) => self.ifthenelse(cond, then, *otherwise),
+ ExprKind::Binary(op, left, right) => self.binop(op, left, right),
+ ExprKind::Call(callee, args) => {
+ // We only handle a few const functions for now.
+ if_chain! {
+ if args.is_empty();
+ if let ExprKind::Path(qpath) = &callee.kind;
+ let res = self.typeck_results.qpath_res(qpath, callee.hir_id);
+ if let Some(def_id) = res.opt_def_id();
+ let def_path = self.lcx.get_def_path(def_id);
+ let def_path: Vec<&str> = def_path.iter().take(4).map(Symbol::as_str).collect();
+ if let ["core", "num", int_impl, "max_value"] = *def_path;
+ then {
+ let value = match int_impl {
+ "<impl i8>" => i8::MAX as u128,
+ "<impl i16>" => i16::MAX as u128,
+ "<impl i32>" => i32::MAX as u128,
+ "<impl i64>" => i64::MAX as u128,
+ "<impl i128>" => i128::MAX as u128,
+ _ => return None,
+ };
+ Some(Constant::Int(value))
+ } else {
+ None
+ }
+ }
+ },
+ ExprKind::Index(arr, index) => self.index(arr, index),
+ ExprKind::AddrOf(_, _, inner) => self.expr(inner).map(|r| Constant::Ref(Box::new(r))),
+ // TODO: add other expressions.
+ _ => None,
+ }
+ }
+
+ #[expect(clippy::cast_possible_wrap)]
+ fn constant_not(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
+ use self::Constant::{Bool, Int};
+ match *o {
+ Bool(b) => Some(Bool(!b)),
+ Int(value) => {
+ let value = !value;
+ match *ty.kind() {
+ ty::Int(ity) => Some(Int(unsext(self.lcx.tcx, value as i128, ity))),
+ ty::Uint(ity) => Some(Int(clip(self.lcx.tcx, value, ity))),
+ _ => None,
+ }
+ },
+ _ => None,
+ }
+ }
+
+ fn constant_negate(&self, o: &Constant, ty: Ty<'_>) -> Option<Constant> {
+ use self::Constant::{Int, F32, F64};
+ match *o {
+ Int(value) => {
+ let ity = match *ty.kind() {
+ ty::Int(ity) => ity,
+ _ => return None,
+ };
+ // sign extend
+ let value = sext(self.lcx.tcx, value, ity);
+ let value = value.checked_neg()?;
+ // clear unused bits
+ Some(Int(unsext(self.lcx.tcx, value, ity)))
+ },
+ F32(f) => Some(F32(-f)),
+ F64(f) => Some(F64(-f)),
+ _ => None,
+ }
+ }
+
+ /// Create `Some(Vec![..])` of all constants, unless there is any
+ /// non-constant part.
+ fn multi(&mut self, vec: &[Expr<'_>]) -> Option<Vec<Constant>> {
+ vec.iter().map(|elem| self.expr(elem)).collect::<Option<_>>()
+ }
+
+ /// Lookup a possibly constant expression from an `ExprKind::Path`.
+ fn fetch_path(&mut self, qpath: &QPath<'_>, id: HirId, ty: Ty<'tcx>) -> Option<Constant> {
+ let res = self.typeck_results.qpath_res(qpath, id);
+ match res {
+ Res::Def(DefKind::Const | DefKind::AssocConst, def_id) => {
+ // Check if this constant is based on `cfg!(..)`,
+ // which is NOT constant for our purposes.
+ if let Some(node) = self.lcx.tcx.hir().get_if_local(def_id) &&
+ let Node::Item(&Item {
+ kind: ItemKind::Const(_, body_id),
+ ..
+ }) = node &&
+ let Node::Expr(&Expr {
+ kind: ExprKind::Lit(_),
+ span,
+ ..
+ }) = self.lcx.tcx.hir().get(body_id.hir_id) &&
+ is_direct_expn_of(span, "cfg").is_some() {
+ return None;
+ }
+
+ let substs = self.typeck_results.node_substs(id);
+ let substs = if self.substs.is_empty() {
+ substs
+ } else {
+ EarlyBinder(substs).subst(self.lcx.tcx, self.substs)
+ };
+
+ let result = self
+ .lcx
+ .tcx
+ .const_eval_resolve(
+ self.param_env,
+ ty::Unevaluated::new(ty::WithOptConstParam::unknown(def_id), substs),
+ None,
+ )
+ .ok()
+ .map(|val| rustc_middle::mir::ConstantKind::from_value(val, ty))?;
+ let result = miri_to_const(self.lcx.tcx, result);
+ if result.is_some() {
+ self.needed_resolution = true;
+ }
+ result
+ },
+ // FIXME: cover all usable cases.
+ _ => None,
+ }
+ }
+
+ fn index(&mut self, lhs: &'_ Expr<'_>, index: &'_ Expr<'_>) -> Option<Constant> {
+ let lhs = self.expr(lhs);
+ let index = self.expr(index);
+
+ match (lhs, index) {
+ (Some(Constant::Vec(vec)), Some(Constant::Int(index))) => match vec.get(index as usize) {
+ Some(Constant::F32(x)) => Some(Constant::F32(*x)),
+ Some(Constant::F64(x)) => Some(Constant::F64(*x)),
+ _ => None,
+ },
+ (Some(Constant::Vec(vec)), _) => {
+ if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
+ match vec.get(0) {
+ Some(Constant::F32(x)) => Some(Constant::F32(*x)),
+ Some(Constant::F64(x)) => Some(Constant::F64(*x)),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+ }
+
+ /// A block can only yield a constant if it only has one constant expression.
+ fn block(&mut self, block: &Block<'_>) -> Option<Constant> {
+ if block.stmts.is_empty() {
+ block.expr.as_ref().and_then(|b| self.expr(b))
+ } else {
+ None
+ }
+ }
+
+ fn ifthenelse(&mut self, cond: &Expr<'_>, then: &Expr<'_>, otherwise: Option<&Expr<'_>>) -> Option<Constant> {
+ if let Some(Constant::Bool(b)) = self.expr(cond) {
+ if b {
+ self.expr(then)
+ } else {
+ otherwise.as_ref().and_then(|expr| self.expr(expr))
+ }
+ } else {
+ None
+ }
+ }
+
+ fn binop(&mut self, op: BinOp, left: &Expr<'_>, right: &Expr<'_>) -> Option<Constant> {
+ let l = self.expr(left)?;
+ let r = self.expr(right);
+ match (l, r) {
+ (Constant::Int(l), Some(Constant::Int(r))) => match *self.typeck_results.expr_ty_opt(left)?.kind() {
+ ty::Int(ity) => {
+ let l = sext(self.lcx.tcx, l, ity);
+ let r = sext(self.lcx.tcx, r, ity);
+ let zext = |n: i128| Constant::Int(unsext(self.lcx.tcx, n, ity));
+ match op.node {
+ BinOpKind::Add => l.checked_add(r).map(zext),
+ BinOpKind::Sub => l.checked_sub(r).map(zext),
+ BinOpKind::Mul => l.checked_mul(r).map(zext),
+ BinOpKind::Div if r != 0 => l.checked_div(r).map(zext),
+ BinOpKind::Rem if r != 0 => l.checked_rem(r).map(zext),
+ BinOpKind::Shr => l.checked_shr(r.try_into().expect("invalid shift")).map(zext),
+ BinOpKind::Shl => l.checked_shl(r.try_into().expect("invalid shift")).map(zext),
+ BinOpKind::BitXor => Some(zext(l ^ r)),
+ BinOpKind::BitOr => Some(zext(l | r)),
+ BinOpKind::BitAnd => Some(zext(l & r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ }
+ },
+ ty::Uint(_) => match op.node {
+ BinOpKind::Add => l.checked_add(r).map(Constant::Int),
+ BinOpKind::Sub => l.checked_sub(r).map(Constant::Int),
+ BinOpKind::Mul => l.checked_mul(r).map(Constant::Int),
+ BinOpKind::Div => l.checked_div(r).map(Constant::Int),
+ BinOpKind::Rem => l.checked_rem(r).map(Constant::Int),
+ BinOpKind::Shr => l.checked_shr(r.try_into().expect("shift too large")).map(Constant::Int),
+ BinOpKind::Shl => l.checked_shl(r.try_into().expect("shift too large")).map(Constant::Int),
+ BinOpKind::BitXor => Some(Constant::Int(l ^ r)),
+ BinOpKind::BitOr => Some(Constant::Int(l | r)),
+ BinOpKind::BitAnd => Some(Constant::Int(l & r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ _ => None,
+ },
+ (Constant::F32(l), Some(Constant::F32(r))) => match op.node {
+ BinOpKind::Add => Some(Constant::F32(l + r)),
+ BinOpKind::Sub => Some(Constant::F32(l - r)),
+ BinOpKind::Mul => Some(Constant::F32(l * r)),
+ BinOpKind::Div => Some(Constant::F32(l / r)),
+ BinOpKind::Rem => Some(Constant::F32(l % r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ (Constant::F64(l), Some(Constant::F64(r))) => match op.node {
+ BinOpKind::Add => Some(Constant::F64(l + r)),
+ BinOpKind::Sub => Some(Constant::F64(l - r)),
+ BinOpKind::Mul => Some(Constant::F64(l * r)),
+ BinOpKind::Div => Some(Constant::F64(l / r)),
+ BinOpKind::Rem => Some(Constant::F64(l % r)),
+ BinOpKind::Eq => Some(Constant::Bool(l == r)),
+ BinOpKind::Ne => Some(Constant::Bool(l != r)),
+ BinOpKind::Lt => Some(Constant::Bool(l < r)),
+ BinOpKind::Le => Some(Constant::Bool(l <= r)),
+ BinOpKind::Ge => Some(Constant::Bool(l >= r)),
+ BinOpKind::Gt => Some(Constant::Bool(l > r)),
+ _ => None,
+ },
+ (l, r) => match (op.node, l, r) {
+ (BinOpKind::And, Constant::Bool(false), _) => Some(Constant::Bool(false)),
+ (BinOpKind::Or, Constant::Bool(true), _) => Some(Constant::Bool(true)),
+ (BinOpKind::And, Constant::Bool(true), Some(r)) | (BinOpKind::Or, Constant::Bool(false), Some(r)) => {
+ Some(r)
+ },
+ (BinOpKind::BitXor, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l ^ r)),
+ (BinOpKind::BitAnd, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l & r)),
+ (BinOpKind::BitOr, Constant::Bool(l), Some(Constant::Bool(r))) => Some(Constant::Bool(l | r)),
+ _ => None,
+ },
+ }
+ }
+}
+
+pub fn miri_to_const<'tcx>(tcx: TyCtxt<'tcx>, result: mir::ConstantKind<'tcx>) -> Option<Constant> {
+ use rustc_middle::mir::interpret::ConstValue;
+ match result {
+ mir::ConstantKind::Val(ConstValue::Scalar(Scalar::Int(int)), _) => {
+ match result.ty().kind() {
+ ty::Bool => Some(Constant::Bool(int == ScalarInt::TRUE)),
+ ty::Uint(_) | ty::Int(_) => Some(Constant::Int(int.assert_bits(int.size()))),
+ ty::Float(FloatTy::F32) => Some(Constant::F32(f32::from_bits(
+ int.try_into().expect("invalid f32 bit representation"),
+ ))),
+ ty::Float(FloatTy::F64) => Some(Constant::F64(f64::from_bits(
+ int.try_into().expect("invalid f64 bit representation"),
+ ))),
+ ty::RawPtr(type_and_mut) => {
+ if let ty::Uint(_) = type_and_mut.ty.kind() {
+ return Some(Constant::RawPtr(int.assert_bits(int.size())));
+ }
+ None
+ },
+ // FIXME: implement other conversions.
+ _ => None,
+ }
+ },
+ mir::ConstantKind::Val(ConstValue::Slice { data, start, end }, _) => match result.ty().kind() {
+ ty::Ref(_, tam, _) => match tam.kind() {
+ ty::Str => String::from_utf8(
+ data.inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(start..end)
+ .to_owned(),
+ )
+ .ok()
+ .map(Constant::Str),
+ _ => None,
+ },
+ _ => None,
+ },
+ mir::ConstantKind::Val(ConstValue::ByRef { alloc, offset: _ }, _) => match result.ty().kind() {
+ ty::Array(sub_type, len) => match sub_type.kind() {
- .chunks(4)
- .map(|chunk| {
- Some(Constant::F32(f32::from_le_bytes(
- chunk.try_into().expect("this shouldn't happen"),
- )))
- })
++ ty::Float(FloatTy::F32) => match len.kind().try_to_machine_usize(tcx) {
+ Some(len) => alloc
+ .inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(0..(4 * usize::try_from(len).unwrap()))
+ .to_owned()
- ty::Float(FloatTy::F64) => match len.to_valtree().try_to_machine_usize(tcx) {
++ .array_chunks::<4>()
++ .map(|&chunk| Some(Constant::F32(f32::from_le_bytes(chunk))))
+ .collect::<Option<Vec<Constant>>>()
+ .map(Constant::Vec),
+ _ => None,
+ },
- .chunks(8)
- .map(|chunk| {
- Some(Constant::F64(f64::from_le_bytes(
- chunk.try_into().expect("this shouldn't happen"),
- )))
- })
++ ty::Float(FloatTy::F64) => match len.kind().try_to_machine_usize(tcx) {
+ Some(len) => alloc
+ .inner()
+ .inspect_with_uninit_and_ptr_outside_interpreter(0..(8 * usize::try_from(len).unwrap()))
+ .to_owned()
++ .array_chunks::<8>()
++ .map(|&chunk| Some(Constant::F64(f64::from_le_bytes(chunk))))
+ .collect::<Option<Vec<Constant>>>()
+ .map(Constant::Vec),
+ _ => None,
+ },
+ // FIXME: implement other array type conversions.
+ _ => None,
+ },
+ _ => None,
+ },
+ // FIXME: implement other conversions.
+ _ => None,
+ }
+}
--- /dev/null
- if self.cannot_be_compared_block(left) || self.cannot_be_compared_block(right) {
- return false;
- }
+use crate::consts::constant_simple;
+use crate::macros::macro_backtrace;
+use crate::source::snippet_opt;
+use rustc_ast::ast::InlineAsmTemplatePiece;
+use rustc_data_structures::fx::FxHasher;
+use rustc_hir::def::Res;
+use rustc_hir::HirIdMap;
+use rustc_hir::{
+ ArrayLen, BinOpKind, Block, BodyId, Closure, Expr, ExprField, ExprKind, FnRetTy, GenericArg, GenericArgs, Guard,
+ HirId, InlineAsmOperand, Let, Lifetime, LifetimeName, ParamName, Pat, PatField, PatKind, Path, PathSegment, QPath,
+ Stmt, StmtKind, Ty, TyKind, TypeBinding,
+};
+use rustc_lexer::{tokenize, TokenKind};
+use rustc_lint::LateContext;
+use rustc_middle::ty::TypeckResults;
+use rustc_span::{sym, Symbol};
+use std::hash::{Hash, Hasher};
+
+/// Callback that is called when two expressions are not equal in the sense of `SpanlessEq`, but
+/// other conditions would make them equal.
+type SpanlessEqCallback<'a> = dyn FnMut(&Expr<'_>, &Expr<'_>) -> bool + 'a;
+
+/// Type used to check whether two ast are the same. This is different from the
+/// operator `==` on ast types as this operator would compare true equality with
+/// ID and span.
+///
+/// Note that some expressions kinds are not considered but could be added.
+pub struct SpanlessEq<'a, 'tcx> {
+ /// Context used to evaluate constant expressions.
+ cx: &'a LateContext<'tcx>,
+ maybe_typeck_results: Option<(&'tcx TypeckResults<'tcx>, &'tcx TypeckResults<'tcx>)>,
+ allow_side_effects: bool,
+ expr_fallback: Option<Box<SpanlessEqCallback<'a>>>,
+}
+
+impl<'a, 'tcx> SpanlessEq<'a, 'tcx> {
+ pub fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
+ maybe_typeck_results: cx.maybe_typeck_results().map(|x| (x, x)),
+ allow_side_effects: true,
+ expr_fallback: None,
+ }
+ }
+
+ /// Consider expressions containing potential side effects as not equal.
+ #[must_use]
+ pub fn deny_side_effects(self) -> Self {
+ Self {
+ allow_side_effects: false,
+ ..self
+ }
+ }
+
+ #[must_use]
+ pub fn expr_fallback(self, expr_fallback: impl FnMut(&Expr<'_>, &Expr<'_>) -> bool + 'a) -> Self {
+ Self {
+ expr_fallback: Some(Box::new(expr_fallback)),
+ ..self
+ }
+ }
+
+ /// Use this method to wrap comparisons that may involve inter-expression context.
+ /// See `self.locals`.
+ pub fn inter_expr(&mut self) -> HirEqInterExpr<'_, 'a, 'tcx> {
+ HirEqInterExpr {
+ inner: self,
+ locals: HirIdMap::default(),
+ }
+ }
+
+ pub fn eq_block(&mut self, left: &Block<'_>, right: &Block<'_>) -> bool {
+ self.inter_expr().eq_block(left, right)
+ }
+
+ pub fn eq_expr(&mut self, left: &Expr<'_>, right: &Expr<'_>) -> bool {
+ self.inter_expr().eq_expr(left, right)
+ }
+
+ pub fn eq_path(&mut self, left: &Path<'_>, right: &Path<'_>) -> bool {
+ self.inter_expr().eq_path(left, right)
+ }
+
+ pub fn eq_path_segment(&mut self, left: &PathSegment<'_>, right: &PathSegment<'_>) -> bool {
+ self.inter_expr().eq_path_segment(left, right)
+ }
+
+ pub fn eq_path_segments(&mut self, left: &[PathSegment<'_>], right: &[PathSegment<'_>]) -> bool {
+ self.inter_expr().eq_path_segments(left, right)
+ }
+}
+
+pub struct HirEqInterExpr<'a, 'b, 'tcx> {
+ inner: &'a mut SpanlessEq<'b, 'tcx>,
+
+ // When binding are declared, the binding ID in the left expression is mapped to the one on the
+ // right. For example, when comparing `{ let x = 1; x + 2 }` and `{ let y = 1; y + 2 }`,
+ // these blocks are considered equal since `x` is mapped to `y`.
+ pub locals: HirIdMap<HirId>,
+}
+
+impl HirEqInterExpr<'_, '_, '_> {
+ pub fn eq_stmt(&mut self, left: &Stmt<'_>, right: &Stmt<'_>) -> bool {
+ match (&left.kind, &right.kind) {
+ (&StmtKind::Local(l), &StmtKind::Local(r)) => {
+ // This additional check ensures that the type of the locals are equivalent even if the init
+ // expression or type have some inferred parts.
+ if let Some((typeck_lhs, typeck_rhs)) = self.inner.maybe_typeck_results {
+ let l_ty = typeck_lhs.pat_ty(l.pat);
+ let r_ty = typeck_rhs.pat_ty(r.pat);
+ if l_ty != r_ty {
+ return false;
+ }
+ }
+
+ // eq_pat adds the HirIds to the locals map. We therefor call it last to make sure that
+ // these only get added if the init and type is equal.
+ both(&l.init, &r.init, |l, r| self.eq_expr(l, r))
+ && both(&l.ty, &r.ty, |l, r| self.eq_ty(l, r))
+ && both(&l.els, &r.els, |l, r| self.eq_block(l, r))
+ && self.eq_pat(l.pat, r.pat)
+ },
+ (&StmtKind::Expr(l), &StmtKind::Expr(r)) | (&StmtKind::Semi(l), &StmtKind::Semi(r)) => self.eq_expr(l, r),
+ _ => false,
+ }
+ }
+
+ /// Checks whether two blocks are the same.
+ fn eq_block(&mut self, left: &Block<'_>, right: &Block<'_>) -> bool {
- fn cannot_be_compared_block(&mut self, block: &Block<'_>) -> bool {
- if block.stmts.last().map_or(false, |stmt| {
- matches!(
- stmt.kind,
- StmtKind::Semi(semi_expr) if self.should_ignore(semi_expr)
- )
- }) {
- return true;
- }
-
- if let Some(block_expr) = block.expr
- && self.should_ignore(block_expr)
- {
- return true
- }
-
- false
- }
-
+ match (left.stmts, left.expr, right.stmts, right.expr) {
+ ([], None, [], None) => {
+ // For empty blocks, check to see if the tokens are equal. This will catch the case where a macro
+ // expanded to nothing, or the cfg attribute was used.
+ let (left, right) = match (
+ snippet_opt(self.inner.cx, left.span),
+ snippet_opt(self.inner.cx, right.span),
+ ) {
+ (Some(left), Some(right)) => (left, right),
+ _ => return true,
+ };
+ let mut left_pos = 0;
+ let left = tokenize(&left)
+ .map(|t| {
+ let end = left_pos + t.len;
+ let s = &left[left_pos..end];
+ left_pos = end;
+ (t, s)
+ })
+ .filter(|(t, _)| {
+ !matches!(
+ t.kind,
+ TokenKind::LineComment { .. } | TokenKind::BlockComment { .. } | TokenKind::Whitespace
+ )
+ })
+ .map(|(_, s)| s);
+ let mut right_pos = 0;
+ let right = tokenize(&right)
+ .map(|t| {
+ let end = right_pos + t.len;
+ let s = &right[right_pos..end];
+ right_pos = end;
+ (t, s)
+ })
+ .filter(|(t, _)| {
+ !matches!(
+ t.kind,
+ TokenKind::LineComment { .. } | TokenKind::BlockComment { .. } | TokenKind::Whitespace
+ )
+ })
+ .map(|(_, s)| s);
+ left.eq(right)
+ },
+ _ => {
+ over(left.stmts, right.stmts, |l, r| self.eq_stmt(l, r))
+ && both(&left.expr, &right.expr, |l, r| self.eq_expr(l, r))
+ },
+ }
+ }
+
- if macro_backtrace(expr.span).last().map_or(false, |macro_call| {
+ fn should_ignore(&mut self, expr: &Expr<'_>) -> bool {
- }) {
- return true;
- }
-
- false
++ macro_backtrace(expr.span).last().map_or(false, |macro_call| {
+ matches!(
+ &self.inner.cx.tcx.get_diagnostic_name(macro_call.def_id),
+ Some(sym::todo_macro | sym::unimplemented_macro)
+ )
- is_eq || self.inner.expr_fallback.as_mut().map_or(false, |f| f(left, right))
++ })
+ }
+
+ pub fn eq_array_length(&mut self, left: ArrayLen, right: ArrayLen) -> bool {
+ match (left, right) {
+ (ArrayLen::Infer(..), ArrayLen::Infer(..)) => true,
+ (ArrayLen::Body(l_ct), ArrayLen::Body(r_ct)) => self.eq_body(l_ct.body, r_ct.body),
+ (_, _) => false,
+ }
+ }
+
+ pub fn eq_body(&mut self, left: BodyId, right: BodyId) -> bool {
+ // swap out TypeckResults when hashing a body
+ let old_maybe_typeck_results = self.inner.maybe_typeck_results.replace((
+ self.inner.cx.tcx.typeck_body(left),
+ self.inner.cx.tcx.typeck_body(right),
+ ));
+ let res = self.eq_expr(
+ &self.inner.cx.tcx.hir().body(left).value,
+ &self.inner.cx.tcx.hir().body(right).value,
+ );
+ self.inner.maybe_typeck_results = old_maybe_typeck_results;
+ res
+ }
+
+ #[expect(clippy::similar_names)]
+ pub fn eq_expr(&mut self, left: &Expr<'_>, right: &Expr<'_>) -> bool {
+ if !self.inner.allow_side_effects && left.span.ctxt() != right.span.ctxt() {
+ return false;
+ }
+
+ if let Some((typeck_lhs, typeck_rhs)) = self.inner.maybe_typeck_results {
+ if let (Some(l), Some(r)) = (
+ constant_simple(self.inner.cx, typeck_lhs, left),
+ constant_simple(self.inner.cx, typeck_rhs, right),
+ ) {
+ if l == r {
+ return true;
+ }
+ }
+ }
+
+ let is_eq = match (
+ reduce_exprkind(self.inner.cx, &left.kind),
+ reduce_exprkind(self.inner.cx, &right.kind),
+ ) {
+ (&ExprKind::AddrOf(lb, l_mut, le), &ExprKind::AddrOf(rb, r_mut, re)) => {
+ lb == rb && l_mut == r_mut && self.eq_expr(le, re)
+ },
+ (&ExprKind::Continue(li), &ExprKind::Continue(ri)) => {
+ both(&li.label, &ri.label, |l, r| l.ident.name == r.ident.name)
+ },
+ (&ExprKind::Assign(ll, lr, _), &ExprKind::Assign(rl, rr, _)) => {
+ self.inner.allow_side_effects && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
+ },
+ (&ExprKind::AssignOp(ref lo, ll, lr), &ExprKind::AssignOp(ref ro, rl, rr)) => {
+ self.inner.allow_side_effects && lo.node == ro.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
+ },
+ (&ExprKind::Block(l, _), &ExprKind::Block(r, _)) => self.eq_block(l, r),
+ (&ExprKind::Binary(l_op, ll, lr), &ExprKind::Binary(r_op, rl, rr)) => {
+ l_op.node == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
+ || swap_binop(l_op.node, ll, lr).map_or(false, |(l_op, ll, lr)| {
+ l_op == r_op.node && self.eq_expr(ll, rl) && self.eq_expr(lr, rr)
+ })
+ },
+ (&ExprKind::Break(li, ref le), &ExprKind::Break(ri, ref re)) => {
+ both(&li.label, &ri.label, |l, r| l.ident.name == r.ident.name)
+ && both(le, re, |l, r| self.eq_expr(l, r))
+ },
+ (&ExprKind::Box(l), &ExprKind::Box(r)) => self.eq_expr(l, r),
+ (&ExprKind::Call(l_fun, l_args), &ExprKind::Call(r_fun, r_args)) => {
+ self.inner.allow_side_effects && self.eq_expr(l_fun, r_fun) && self.eq_exprs(l_args, r_args)
+ },
+ (&ExprKind::Cast(lx, lt), &ExprKind::Cast(rx, rt)) | (&ExprKind::Type(lx, lt), &ExprKind::Type(rx, rt)) => {
+ self.eq_expr(lx, rx) && self.eq_ty(lt, rt)
+ },
+ (&ExprKind::Field(l_f_exp, ref l_f_ident), &ExprKind::Field(r_f_exp, ref r_f_ident)) => {
+ l_f_ident.name == r_f_ident.name && self.eq_expr(l_f_exp, r_f_exp)
+ },
+ (&ExprKind::Index(la, li), &ExprKind::Index(ra, ri)) => self.eq_expr(la, ra) && self.eq_expr(li, ri),
+ (&ExprKind::If(lc, lt, ref le), &ExprKind::If(rc, rt, ref re)) => {
+ self.eq_expr(lc, rc) && self.eq_expr(lt, rt) && both(le, re, |l, r| self.eq_expr(l, r))
+ },
+ (&ExprKind::Let(l), &ExprKind::Let(r)) => {
+ self.eq_pat(l.pat, r.pat) && both(&l.ty, &r.ty, |l, r| self.eq_ty(l, r)) && self.eq_expr(l.init, r.init)
+ },
+ (&ExprKind::Lit(ref l), &ExprKind::Lit(ref r)) => l.node == r.node,
+ (&ExprKind::Loop(lb, ref ll, ref lls, _), &ExprKind::Loop(rb, ref rl, ref rls, _)) => {
+ lls == rls && self.eq_block(lb, rb) && both(ll, rl, |l, r| l.ident.name == r.ident.name)
+ },
+ (&ExprKind::Match(le, la, ref ls), &ExprKind::Match(re, ra, ref rs)) => {
+ ls == rs
+ && self.eq_expr(le, re)
+ && over(la, ra, |l, r| {
+ self.eq_pat(l.pat, r.pat)
+ && both(&l.guard, &r.guard, |l, r| self.eq_guard(l, r))
+ && self.eq_expr(l.body, r.body)
+ })
+ },
+ (&ExprKind::MethodCall(l_path, l_args, _), &ExprKind::MethodCall(r_path, r_args, _)) => {
+ self.inner.allow_side_effects && self.eq_path_segment(l_path, r_path) && self.eq_exprs(l_args, r_args)
+ },
+ (&ExprKind::Repeat(le, ll), &ExprKind::Repeat(re, rl)) => {
+ self.eq_expr(le, re) && self.eq_array_length(ll, rl)
+ },
+ (&ExprKind::Ret(ref l), &ExprKind::Ret(ref r)) => both(l, r, |l, r| self.eq_expr(l, r)),
+ (&ExprKind::Path(ref l), &ExprKind::Path(ref r)) => self.eq_qpath(l, r),
+ (&ExprKind::Struct(l_path, lf, ref lo), &ExprKind::Struct(r_path, rf, ref ro)) => {
+ self.eq_qpath(l_path, r_path)
+ && both(lo, ro, |l, r| self.eq_expr(l, r))
+ && over(lf, rf, |l, r| self.eq_expr_field(l, r))
+ },
+ (&ExprKind::Tup(l_tup), &ExprKind::Tup(r_tup)) => self.eq_exprs(l_tup, r_tup),
+ (&ExprKind::Unary(l_op, le), &ExprKind::Unary(r_op, re)) => l_op == r_op && self.eq_expr(le, re),
+ (&ExprKind::Array(l), &ExprKind::Array(r)) => self.eq_exprs(l, r),
+ (&ExprKind::DropTemps(le), &ExprKind::DropTemps(re)) => self.eq_expr(le, re),
+ _ => false,
+ };
++ (is_eq && (!self.should_ignore(left) || !self.should_ignore(right)))
++ || self.inner.expr_fallback.as_mut().map_or(false, |f| f(left, right))
+ }
+
+ fn eq_exprs(&mut self, left: &[Expr<'_>], right: &[Expr<'_>]) -> bool {
+ over(left, right, |l, r| self.eq_expr(l, r))
+ }
+
+ fn eq_expr_field(&mut self, left: &ExprField<'_>, right: &ExprField<'_>) -> bool {
+ left.ident.name == right.ident.name && self.eq_expr(left.expr, right.expr)
+ }
+
+ fn eq_guard(&mut self, left: &Guard<'_>, right: &Guard<'_>) -> bool {
+ match (left, right) {
+ (Guard::If(l), Guard::If(r)) => self.eq_expr(l, r),
+ (Guard::IfLet(l), Guard::IfLet(r)) => {
+ self.eq_pat(l.pat, r.pat) && both(&l.ty, &r.ty, |l, r| self.eq_ty(l, r)) && self.eq_expr(l.init, r.init)
+ },
+ _ => false,
+ }
+ }
+
+ fn eq_generic_arg(&mut self, left: &GenericArg<'_>, right: &GenericArg<'_>) -> bool {
+ match (left, right) {
+ (GenericArg::Const(l), GenericArg::Const(r)) => self.eq_body(l.value.body, r.value.body),
+ (GenericArg::Lifetime(l_lt), GenericArg::Lifetime(r_lt)) => Self::eq_lifetime(l_lt, r_lt),
+ (GenericArg::Type(l_ty), GenericArg::Type(r_ty)) => self.eq_ty(l_ty, r_ty),
+ (GenericArg::Infer(l_inf), GenericArg::Infer(r_inf)) => self.eq_ty(&l_inf.to_ty(), &r_inf.to_ty()),
+ _ => false,
+ }
+ }
+
+ fn eq_lifetime(left: &Lifetime, right: &Lifetime) -> bool {
+ left.name == right.name
+ }
+
+ fn eq_pat_field(&mut self, left: &PatField<'_>, right: &PatField<'_>) -> bool {
+ let (PatField { ident: li, pat: lp, .. }, PatField { ident: ri, pat: rp, .. }) = (&left, &right);
+ li.name == ri.name && self.eq_pat(lp, rp)
+ }
+
+ /// Checks whether two patterns are the same.
+ fn eq_pat(&mut self, left: &Pat<'_>, right: &Pat<'_>) -> bool {
+ match (&left.kind, &right.kind) {
+ (&PatKind::Box(l), &PatKind::Box(r)) => self.eq_pat(l, r),
+ (&PatKind::Struct(ref lp, la, ..), &PatKind::Struct(ref rp, ra, ..)) => {
+ self.eq_qpath(lp, rp) && over(la, ra, |l, r| self.eq_pat_field(l, r))
+ },
+ (&PatKind::TupleStruct(ref lp, la, ls), &PatKind::TupleStruct(ref rp, ra, rs)) => {
+ self.eq_qpath(lp, rp) && over(la, ra, |l, r| self.eq_pat(l, r)) && ls == rs
+ },
+ (&PatKind::Binding(lb, li, _, ref lp), &PatKind::Binding(rb, ri, _, ref rp)) => {
+ let eq = lb == rb && both(lp, rp, |l, r| self.eq_pat(l, r));
+ if eq {
+ self.locals.insert(li, ri);
+ }
+ eq
+ },
+ (&PatKind::Path(ref l), &PatKind::Path(ref r)) => self.eq_qpath(l, r),
+ (&PatKind::Lit(l), &PatKind::Lit(r)) => self.eq_expr(l, r),
+ (&PatKind::Tuple(l, ls), &PatKind::Tuple(r, rs)) => ls == rs && over(l, r, |l, r| self.eq_pat(l, r)),
+ (&PatKind::Range(ref ls, ref le, li), &PatKind::Range(ref rs, ref re, ri)) => {
+ both(ls, rs, |a, b| self.eq_expr(a, b)) && both(le, re, |a, b| self.eq_expr(a, b)) && (li == ri)
+ },
+ (&PatKind::Ref(le, ref lm), &PatKind::Ref(re, ref rm)) => lm == rm && self.eq_pat(le, re),
+ (&PatKind::Slice(ls, ref li, le), &PatKind::Slice(rs, ref ri, re)) => {
+ over(ls, rs, |l, r| self.eq_pat(l, r))
+ && over(le, re, |l, r| self.eq_pat(l, r))
+ && both(li, ri, |l, r| self.eq_pat(l, r))
+ },
+ (&PatKind::Wild, &PatKind::Wild) => true,
+ _ => false,
+ }
+ }
+
+ #[expect(clippy::similar_names)]
+ fn eq_qpath(&mut self, left: &QPath<'_>, right: &QPath<'_>) -> bool {
+ match (left, right) {
+ (&QPath::Resolved(ref lty, lpath), &QPath::Resolved(ref rty, rpath)) => {
+ both(lty, rty, |l, r| self.eq_ty(l, r)) && self.eq_path(lpath, rpath)
+ },
+ (&QPath::TypeRelative(lty, lseg), &QPath::TypeRelative(rty, rseg)) => {
+ self.eq_ty(lty, rty) && self.eq_path_segment(lseg, rseg)
+ },
+ (&QPath::LangItem(llang_item, ..), &QPath::LangItem(rlang_item, ..)) => llang_item == rlang_item,
+ _ => false,
+ }
+ }
+
+ pub fn eq_path(&mut self, left: &Path<'_>, right: &Path<'_>) -> bool {
+ match (left.res, right.res) {
+ (Res::Local(l), Res::Local(r)) => l == r || self.locals.get(&l) == Some(&r),
+ (Res::Local(_), _) | (_, Res::Local(_)) => false,
+ _ => over(left.segments, right.segments, |l, r| self.eq_path_segment(l, r)),
+ }
+ }
+
+ fn eq_path_parameters(&mut self, left: &GenericArgs<'_>, right: &GenericArgs<'_>) -> bool {
+ if !(left.parenthesized || right.parenthesized) {
+ over(left.args, right.args, |l, r| self.eq_generic_arg(l, r)) // FIXME(flip1995): may not work
+ && over(left.bindings, right.bindings, |l, r| self.eq_type_binding(l, r))
+ } else if left.parenthesized && right.parenthesized {
+ over(left.inputs(), right.inputs(), |l, r| self.eq_ty(l, r))
+ && both(&Some(&left.bindings[0].ty()), &Some(&right.bindings[0].ty()), |l, r| {
+ self.eq_ty(l, r)
+ })
+ } else {
+ false
+ }
+ }
+
+ pub fn eq_path_segments(&mut self, left: &[PathSegment<'_>], right: &[PathSegment<'_>]) -> bool {
+ left.len() == right.len() && left.iter().zip(right).all(|(l, r)| self.eq_path_segment(l, r))
+ }
+
+ pub fn eq_path_segment(&mut self, left: &PathSegment<'_>, right: &PathSegment<'_>) -> bool {
+ // The == of idents doesn't work with different contexts,
+ // we have to be explicit about hygiene
+ left.ident.name == right.ident.name && both(&left.args, &right.args, |l, r| self.eq_path_parameters(l, r))
+ }
+
+ pub fn eq_ty(&mut self, left: &Ty<'_>, right: &Ty<'_>) -> bool {
+ match (&left.kind, &right.kind) {
+ (&TyKind::Slice(l_vec), &TyKind::Slice(r_vec)) => self.eq_ty(l_vec, r_vec),
+ (&TyKind::Array(lt, ll), &TyKind::Array(rt, rl)) => self.eq_ty(lt, rt) && self.eq_array_length(ll, rl),
+ (&TyKind::Ptr(ref l_mut), &TyKind::Ptr(ref r_mut)) => {
+ l_mut.mutbl == r_mut.mutbl && self.eq_ty(l_mut.ty, r_mut.ty)
+ },
+ (&TyKind::Rptr(_, ref l_rmut), &TyKind::Rptr(_, ref r_rmut)) => {
+ l_rmut.mutbl == r_rmut.mutbl && self.eq_ty(l_rmut.ty, r_rmut.ty)
+ },
+ (&TyKind::Path(ref l), &TyKind::Path(ref r)) => self.eq_qpath(l, r),
+ (&TyKind::Tup(l), &TyKind::Tup(r)) => over(l, r, |l, r| self.eq_ty(l, r)),
+ (&TyKind::Infer, &TyKind::Infer) => true,
+ _ => false,
+ }
+ }
+
+ fn eq_type_binding(&mut self, left: &TypeBinding<'_>, right: &TypeBinding<'_>) -> bool {
+ left.ident.name == right.ident.name && self.eq_ty(left.ty(), right.ty())
+ }
+}
+
+/// Some simple reductions like `{ return }` => `return`
+fn reduce_exprkind<'hir>(cx: &LateContext<'_>, kind: &'hir ExprKind<'hir>) -> &'hir ExprKind<'hir> {
+ if let ExprKind::Block(block, _) = kind {
+ match (block.stmts, block.expr) {
+ // From an `if let` expression without an `else` block. The arm for the implicit wild pattern is an empty
+ // block with an empty span.
+ ([], None) if block.span.is_empty() => &ExprKind::Tup(&[]),
+ // `{}` => `()`
+ ([], None) => match snippet_opt(cx, block.span) {
+ // Don't reduce if there are any tokens contained in the braces
+ Some(snip)
+ if tokenize(&snip)
+ .map(|t| t.kind)
+ .filter(|t| {
+ !matches!(
+ t,
+ TokenKind::LineComment { .. } | TokenKind::BlockComment { .. } | TokenKind::Whitespace
+ )
+ })
+ .ne([TokenKind::OpenBrace, TokenKind::CloseBrace].iter().copied()) =>
+ {
+ kind
+ },
+ _ => &ExprKind::Tup(&[]),
+ },
+ ([], Some(expr)) => match expr.kind {
+ // `{ return .. }` => `return ..`
+ ExprKind::Ret(..) => &expr.kind,
+ _ => kind,
+ },
+ ([stmt], None) => match stmt.kind {
+ StmtKind::Expr(expr) | StmtKind::Semi(expr) => match expr.kind {
+ // `{ return ..; }` => `return ..`
+ ExprKind::Ret(..) => &expr.kind,
+ _ => kind,
+ },
+ _ => kind,
+ },
+ _ => kind,
+ }
+ } else {
+ kind
+ }
+}
+
+fn swap_binop<'a>(
+ binop: BinOpKind,
+ lhs: &'a Expr<'a>,
+ rhs: &'a Expr<'a>,
+) -> Option<(BinOpKind, &'a Expr<'a>, &'a Expr<'a>)> {
+ match binop {
+ BinOpKind::Add | BinOpKind::Eq | BinOpKind::Ne | BinOpKind::BitAnd | BinOpKind::BitXor | BinOpKind::BitOr => {
+ Some((binop, rhs, lhs))
+ },
+ BinOpKind::Lt => Some((BinOpKind::Gt, rhs, lhs)),
+ BinOpKind::Le => Some((BinOpKind::Ge, rhs, lhs)),
+ BinOpKind::Ge => Some((BinOpKind::Le, rhs, lhs)),
+ BinOpKind::Gt => Some((BinOpKind::Lt, rhs, lhs)),
+ BinOpKind::Mul // Not always commutative, e.g. with matrices. See issue #5698
+ | BinOpKind::Shl
+ | BinOpKind::Shr
+ | BinOpKind::Rem
+ | BinOpKind::Sub
+ | BinOpKind::Div
+ | BinOpKind::And
+ | BinOpKind::Or => None,
+ }
+}
+
+/// Checks if the two `Option`s are both `None` or some equal values as per
+/// `eq_fn`.
+pub fn both<X>(l: &Option<X>, r: &Option<X>, mut eq_fn: impl FnMut(&X, &X) -> bool) -> bool {
+ l.as_ref()
+ .map_or_else(|| r.is_none(), |x| r.as_ref().map_or(false, |y| eq_fn(x, y)))
+}
+
+/// Checks if two slices are equal as per `eq_fn`.
+pub fn over<X>(left: &[X], right: &[X], mut eq_fn: impl FnMut(&X, &X) -> bool) -> bool {
+ left.len() == right.len() && left.iter().zip(right).all(|(x, y)| eq_fn(x, y))
+}
+
+/// Counts how many elements of the slices are equal as per `eq_fn`.
+pub fn count_eq<X: Sized>(
+ left: &mut dyn Iterator<Item = X>,
+ right: &mut dyn Iterator<Item = X>,
+ mut eq_fn: impl FnMut(&X, &X) -> bool,
+) -> usize {
+ left.zip(right).take_while(|(l, r)| eq_fn(l, r)).count()
+}
+
+/// Checks if two expressions evaluate to the same value, and don't contain any side effects.
+pub fn eq_expr_value(cx: &LateContext<'_>, left: &Expr<'_>, right: &Expr<'_>) -> bool {
+ SpanlessEq::new(cx).deny_side_effects().eq_expr(left, right)
+}
+
+/// Type used to hash an ast element. This is different from the `Hash` trait
+/// on ast types as this
+/// trait would consider IDs and spans.
+///
+/// All expressions kind are hashed, but some might have a weaker hash.
+pub struct SpanlessHash<'a, 'tcx> {
+ /// Context used to evaluate constant expressions.
+ cx: &'a LateContext<'tcx>,
+ maybe_typeck_results: Option<&'tcx TypeckResults<'tcx>>,
+ s: FxHasher,
+}
+
+impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
+ pub fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
+ maybe_typeck_results: cx.maybe_typeck_results(),
+ s: FxHasher::default(),
+ }
+ }
+
+ pub fn finish(self) -> u64 {
+ self.s.finish()
+ }
+
+ pub fn hash_block(&mut self, b: &Block<'_>) {
+ for s in b.stmts {
+ self.hash_stmt(s);
+ }
+
+ if let Some(e) = b.expr {
+ self.hash_expr(e);
+ }
+
+ std::mem::discriminant(&b.rules).hash(&mut self.s);
+ }
+
+ #[expect(clippy::too_many_lines)]
+ pub fn hash_expr(&mut self, e: &Expr<'_>) {
+ let simple_const = self
+ .maybe_typeck_results
+ .and_then(|typeck_results| constant_simple(self.cx, typeck_results, e));
+
+ // const hashing may result in the same hash as some unrelated node, so add a sort of
+ // discriminant depending on which path we're choosing next
+ simple_const.hash(&mut self.s);
+ if simple_const.is_some() {
+ return;
+ }
+
+ std::mem::discriminant(&e.kind).hash(&mut self.s);
+
+ match e.kind {
+ ExprKind::AddrOf(kind, m, e) => {
+ std::mem::discriminant(&kind).hash(&mut self.s);
+ m.hash(&mut self.s);
+ self.hash_expr(e);
+ },
+ ExprKind::Continue(i) => {
+ if let Some(i) = i.label {
+ self.hash_name(i.ident.name);
+ }
+ },
+ ExprKind::Assign(l, r, _) => {
+ self.hash_expr(l);
+ self.hash_expr(r);
+ },
+ ExprKind::AssignOp(ref o, l, r) => {
+ std::mem::discriminant(&o.node).hash(&mut self.s);
+ self.hash_expr(l);
+ self.hash_expr(r);
+ },
+ ExprKind::Block(b, _) => {
+ self.hash_block(b);
+ },
+ ExprKind::Binary(op, l, r) => {
+ std::mem::discriminant(&op.node).hash(&mut self.s);
+ self.hash_expr(l);
+ self.hash_expr(r);
+ },
+ ExprKind::Break(i, ref j) => {
+ if let Some(i) = i.label {
+ self.hash_name(i.ident.name);
+ }
+ if let Some(j) = *j {
+ self.hash_expr(j);
+ }
+ },
+ ExprKind::Box(e) | ExprKind::DropTemps(e) | ExprKind::Yield(e, _) => {
+ self.hash_expr(e);
+ },
+ ExprKind::Call(fun, args) => {
+ self.hash_expr(fun);
+ self.hash_exprs(args);
+ },
+ ExprKind::Cast(e, ty) | ExprKind::Type(e, ty) => {
+ self.hash_expr(e);
+ self.hash_ty(ty);
+ },
+ ExprKind::Closure(&Closure {
+ capture_clause, body, ..
+ }) => {
+ std::mem::discriminant(&capture_clause).hash(&mut self.s);
+ // closures inherit TypeckResults
+ self.hash_expr(&self.cx.tcx.hir().body(body).value);
+ },
+ ExprKind::Field(e, ref f) => {
+ self.hash_expr(e);
+ self.hash_name(f.name);
+ },
+ ExprKind::Index(a, i) => {
+ self.hash_expr(a);
+ self.hash_expr(i);
+ },
+ ExprKind::InlineAsm(asm) => {
+ for piece in asm.template {
+ match piece {
+ InlineAsmTemplatePiece::String(s) => s.hash(&mut self.s),
+ InlineAsmTemplatePiece::Placeholder {
+ operand_idx,
+ modifier,
+ span: _,
+ } => {
+ operand_idx.hash(&mut self.s);
+ modifier.hash(&mut self.s);
+ },
+ }
+ }
+ asm.options.hash(&mut self.s);
+ for (op, _op_sp) in asm.operands {
+ match op {
+ InlineAsmOperand::In { reg, expr } => {
+ reg.hash(&mut self.s);
+ self.hash_expr(expr);
+ },
+ InlineAsmOperand::Out { reg, late, expr } => {
+ reg.hash(&mut self.s);
+ late.hash(&mut self.s);
+ if let Some(expr) = expr {
+ self.hash_expr(expr);
+ }
+ },
+ InlineAsmOperand::InOut { reg, late, expr } => {
+ reg.hash(&mut self.s);
+ late.hash(&mut self.s);
+ self.hash_expr(expr);
+ },
+ InlineAsmOperand::SplitInOut {
+ reg,
+ late,
+ in_expr,
+ out_expr,
+ } => {
+ reg.hash(&mut self.s);
+ late.hash(&mut self.s);
+ self.hash_expr(in_expr);
+ if let Some(out_expr) = out_expr {
+ self.hash_expr(out_expr);
+ }
+ },
+ InlineAsmOperand::Const { anon_const } | InlineAsmOperand::SymFn { anon_const } => {
+ self.hash_body(anon_const.body);
+ },
+ InlineAsmOperand::SymStatic { path, def_id: _ } => self.hash_qpath(path),
+ }
+ }
+ },
+ ExprKind::Let(Let { pat, init, ty, .. }) => {
+ self.hash_expr(init);
+ if let Some(ty) = ty {
+ self.hash_ty(ty);
+ }
+ self.hash_pat(pat);
+ },
+ ExprKind::Err => {},
+ ExprKind::Lit(ref l) => {
+ l.node.hash(&mut self.s);
+ },
+ ExprKind::Loop(b, ref i, ..) => {
+ self.hash_block(b);
+ if let Some(i) = *i {
+ self.hash_name(i.ident.name);
+ }
+ },
+ ExprKind::If(cond, then, ref else_opt) => {
+ self.hash_expr(cond);
+ self.hash_expr(then);
+ if let Some(e) = *else_opt {
+ self.hash_expr(e);
+ }
+ },
+ ExprKind::Match(e, arms, ref s) => {
+ self.hash_expr(e);
+
+ for arm in arms {
+ self.hash_pat(arm.pat);
+ if let Some(ref e) = arm.guard {
+ self.hash_guard(e);
+ }
+ self.hash_expr(arm.body);
+ }
+
+ s.hash(&mut self.s);
+ },
+ ExprKind::MethodCall(path, args, ref _fn_span) => {
+ self.hash_name(path.ident.name);
+ self.hash_exprs(args);
+ },
+ ExprKind::ConstBlock(ref l_id) => {
+ self.hash_body(l_id.body);
+ },
+ ExprKind::Repeat(e, len) => {
+ self.hash_expr(e);
+ self.hash_array_length(len);
+ },
+ ExprKind::Ret(ref e) => {
+ if let Some(e) = *e {
+ self.hash_expr(e);
+ }
+ },
+ ExprKind::Path(ref qpath) => {
+ self.hash_qpath(qpath);
+ },
+ ExprKind::Struct(path, fields, ref expr) => {
+ self.hash_qpath(path);
+
+ for f in fields {
+ self.hash_name(f.ident.name);
+ self.hash_expr(f.expr);
+ }
+
+ if let Some(e) = *expr {
+ self.hash_expr(e);
+ }
+ },
+ ExprKind::Tup(tup) => {
+ self.hash_exprs(tup);
+ },
+ ExprKind::Array(v) => {
+ self.hash_exprs(v);
+ },
+ ExprKind::Unary(lop, le) => {
+ std::mem::discriminant(&lop).hash(&mut self.s);
+ self.hash_expr(le);
+ },
+ }
+ }
+
+ pub fn hash_exprs(&mut self, e: &[Expr<'_>]) {
+ for e in e {
+ self.hash_expr(e);
+ }
+ }
+
+ pub fn hash_name(&mut self, n: Symbol) {
+ n.hash(&mut self.s);
+ }
+
+ pub fn hash_qpath(&mut self, p: &QPath<'_>) {
+ match *p {
+ QPath::Resolved(_, path) => {
+ self.hash_path(path);
+ },
+ QPath::TypeRelative(_, path) => {
+ self.hash_name(path.ident.name);
+ },
+ QPath::LangItem(lang_item, ..) => {
+ std::mem::discriminant(&lang_item).hash(&mut self.s);
+ },
+ }
+ // self.maybe_typeck_results.unwrap().qpath_res(p, id).hash(&mut self.s);
+ }
+
+ pub fn hash_pat(&mut self, pat: &Pat<'_>) {
+ std::mem::discriminant(&pat.kind).hash(&mut self.s);
+ match pat.kind {
+ PatKind::Binding(ann, _, _, pat) => {
+ std::mem::discriminant(&ann).hash(&mut self.s);
+ if let Some(pat) = pat {
+ self.hash_pat(pat);
+ }
+ },
+ PatKind::Box(pat) => self.hash_pat(pat),
+ PatKind::Lit(expr) => self.hash_expr(expr),
+ PatKind::Or(pats) => {
+ for pat in pats {
+ self.hash_pat(pat);
+ }
+ },
+ PatKind::Path(ref qpath) => self.hash_qpath(qpath),
+ PatKind::Range(s, e, i) => {
+ if let Some(s) = s {
+ self.hash_expr(s);
+ }
+ if let Some(e) = e {
+ self.hash_expr(e);
+ }
+ std::mem::discriminant(&i).hash(&mut self.s);
+ },
+ PatKind::Ref(pat, mu) => {
+ self.hash_pat(pat);
+ std::mem::discriminant(&mu).hash(&mut self.s);
+ },
+ PatKind::Slice(l, m, r) => {
+ for pat in l {
+ self.hash_pat(pat);
+ }
+ if let Some(pat) = m {
+ self.hash_pat(pat);
+ }
+ for pat in r {
+ self.hash_pat(pat);
+ }
+ },
+ PatKind::Struct(ref qpath, fields, e) => {
+ self.hash_qpath(qpath);
+ for f in fields {
+ self.hash_name(f.ident.name);
+ self.hash_pat(f.pat);
+ }
+ e.hash(&mut self.s);
+ },
+ PatKind::Tuple(pats, e) => {
+ for pat in pats {
+ self.hash_pat(pat);
+ }
+ e.hash(&mut self.s);
+ },
+ PatKind::TupleStruct(ref qpath, pats, e) => {
+ self.hash_qpath(qpath);
+ for pat in pats {
+ self.hash_pat(pat);
+ }
+ e.hash(&mut self.s);
+ },
+ PatKind::Wild => {},
+ }
+ }
+
+ pub fn hash_path(&mut self, path: &Path<'_>) {
+ match path.res {
+ // constant hash since equality is dependant on inter-expression context
+ // e.g. The expressions `if let Some(x) = foo() {}` and `if let Some(y) = foo() {}` are considered equal
+ // even though the binding names are different and they have different `HirId`s.
+ Res::Local(_) => 1_usize.hash(&mut self.s),
+ _ => {
+ for seg in path.segments {
+ self.hash_name(seg.ident.name);
+ self.hash_generic_args(seg.args().args);
+ }
+ },
+ }
+ }
+
+ pub fn hash_stmt(&mut self, b: &Stmt<'_>) {
+ std::mem::discriminant(&b.kind).hash(&mut self.s);
+
+ match &b.kind {
+ StmtKind::Local(local) => {
+ self.hash_pat(local.pat);
+ if let Some(init) = local.init {
+ self.hash_expr(init);
+ }
+ if let Some(els) = local.els {
+ self.hash_block(els);
+ }
+ },
+ StmtKind::Item(..) => {},
+ StmtKind::Expr(expr) | StmtKind::Semi(expr) => {
+ self.hash_expr(expr);
+ },
+ }
+ }
+
+ pub fn hash_guard(&mut self, g: &Guard<'_>) {
+ match g {
+ Guard::If(expr) | Guard::IfLet(Let { init: expr, .. }) => {
+ self.hash_expr(expr);
+ },
+ }
+ }
+
+ pub fn hash_lifetime(&mut self, lifetime: Lifetime) {
+ std::mem::discriminant(&lifetime.name).hash(&mut self.s);
+ if let LifetimeName::Param(param_id, ref name) = lifetime.name {
+ std::mem::discriminant(name).hash(&mut self.s);
+ param_id.hash(&mut self.s);
+ match name {
+ ParamName::Plain(ref ident) => {
+ ident.name.hash(&mut self.s);
+ },
+ ParamName::Fresh | ParamName::Error => {},
+ }
+ }
+ }
+
+ pub fn hash_ty(&mut self, ty: &Ty<'_>) {
+ std::mem::discriminant(&ty.kind).hash(&mut self.s);
+ self.hash_tykind(&ty.kind);
+ }
+
+ pub fn hash_tykind(&mut self, ty: &TyKind<'_>) {
+ match ty {
+ TyKind::Slice(ty) => {
+ self.hash_ty(ty);
+ },
+ &TyKind::Array(ty, len) => {
+ self.hash_ty(ty);
+ self.hash_array_length(len);
+ },
+ TyKind::Ptr(ref mut_ty) => {
+ self.hash_ty(mut_ty.ty);
+ mut_ty.mutbl.hash(&mut self.s);
+ },
+ TyKind::Rptr(lifetime, ref mut_ty) => {
+ self.hash_lifetime(*lifetime);
+ self.hash_ty(mut_ty.ty);
+ mut_ty.mutbl.hash(&mut self.s);
+ },
+ TyKind::BareFn(bfn) => {
+ bfn.unsafety.hash(&mut self.s);
+ bfn.abi.hash(&mut self.s);
+ for arg in bfn.decl.inputs {
+ self.hash_ty(arg);
+ }
+ std::mem::discriminant(&bfn.decl.output).hash(&mut self.s);
+ match bfn.decl.output {
+ FnRetTy::DefaultReturn(_) => {},
+ FnRetTy::Return(ty) => {
+ self.hash_ty(ty);
+ },
+ }
+ bfn.decl.c_variadic.hash(&mut self.s);
+ },
+ TyKind::Tup(ty_list) => {
+ for ty in *ty_list {
+ self.hash_ty(ty);
+ }
+ },
+ TyKind::Path(ref qpath) => self.hash_qpath(qpath),
+ TyKind::OpaqueDef(_, arg_list) => {
+ self.hash_generic_args(arg_list);
+ },
+ TyKind::TraitObject(_, lifetime, _) => {
+ self.hash_lifetime(*lifetime);
+ },
+ TyKind::Typeof(anon_const) => {
+ self.hash_body(anon_const.body);
+ },
+ TyKind::Err | TyKind::Infer | TyKind::Never => {},
+ }
+ }
+
+ pub fn hash_array_length(&mut self, length: ArrayLen) {
+ match length {
+ ArrayLen::Infer(..) => {},
+ ArrayLen::Body(anon_const) => self.hash_body(anon_const.body),
+ }
+ }
+
+ pub fn hash_body(&mut self, body_id: BodyId) {
+ // swap out TypeckResults when hashing a body
+ let old_maybe_typeck_results = self.maybe_typeck_results.replace(self.cx.tcx.typeck_body(body_id));
+ self.hash_expr(&self.cx.tcx.hir().body(body_id).value);
+ self.maybe_typeck_results = old_maybe_typeck_results;
+ }
+
+ fn hash_generic_args(&mut self, arg_list: &[GenericArg<'_>]) {
+ for arg in arg_list {
+ match *arg {
+ GenericArg::Lifetime(l) => self.hash_lifetime(l),
+ GenericArg::Type(ref ty) => self.hash_ty(ty),
+ GenericArg::Const(ref ca) => self.hash_body(ca.value.body),
+ GenericArg::Infer(ref inf) => self.hash_ty(&inf.to_ty()),
+ }
+ }
+ }
+}
+
+pub fn hash_stmt(cx: &LateContext<'_>, s: &Stmt<'_>) -> u64 {
+ let mut h = SpanlessHash::new(cx);
+ h.hash_stmt(s);
+ h.finish()
+}
+
+pub fn hash_expr(cx: &LateContext<'_>, e: &Expr<'_>) -> u64 {
+ let mut h = SpanlessHash::new(cx);
+ h.hash_expr(e);
+ h.finish()
+}
--- /dev/null
- fn with_test_item_names<'tcx>(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
++#![feature(array_chunks)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(let_else)]
+#![cfg_attr(bootstrap, feature(let_chains))]
+#![feature(lint_reasons)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_errors_doc, clippy::missing_panics_doc, clippy::must_use_candidate)]
+// warn on the same lints as `clippy_lints`
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
+extern crate rustc_data_structures;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+extern crate rustc_typeck;
+
+#[macro_use]
+pub mod sym_helper;
+
+pub mod ast_utils;
+pub mod attrs;
+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 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::hir_utils::{
+ both, count_eq, eq_expr_value, hash_expr, hash_stmt, over, HirEqInterExpr, SpanlessEq, SpanlessHash,
+};
+
+use std::collections::hash_map::Entry;
+use std::hash::BuildHasherDefault;
+use std::sync::OnceLock;
+use std::sync::{Mutex, MutexGuard};
+
+use if_chain::if_chain;
+use rustc_ast::ast::{self, LitKind};
+use rustc_ast::Attribute;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::unhash::UnhashMap;
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID};
+use rustc_hir::hir_id::{HirIdMap, HirIdSet};
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::LangItem::{OptionNone, ResultErr, ResultOk};
+use rustc_hir::{
+ def, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Closure, Constness, Destination, Expr,
+ ExprKind, FnDecl, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem, Local, MatchSource,
+ Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, TraitItem, TraitItemKind,
+ TraitRef, TyKind, UnOp,
+};
+use rustc_lint::{LateContext, Level, Lint, LintContext};
+use rustc_middle::hir::place::PlaceBase;
+use rustc_middle::ty as rustc_ty;
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
+use rustc_middle::ty::binding::BindingMode;
+use rustc_middle::ty::fast_reject::SimplifiedTypeGen::{
+ ArraySimplifiedType, BoolSimplifiedType, CharSimplifiedType, FloatSimplifiedType, IntSimplifiedType,
+ PtrSimplifiedType, SliceSimplifiedType, StrSimplifiedType, UintSimplifiedType,
+};
+use rustc_middle::ty::{
+ layout::IntegerExt, BorrowKind, ClosureKind, DefIdTree, Ty, TyCtxt, TypeAndMut, TypeVisitable, UpvarCapture,
+};
+use rustc_middle::ty::{FloatTy, IntTy, UintTy};
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+use rustc_span::hygiene::{ExpnKind, MacroKind};
+use rustc_span::source_map::original_sp;
+use rustc_span::sym;
+use rustc_span::symbol::{kw, Symbol};
+use rustc_span::{Span, DUMMY_SP};
+use rustc_target::abi::Integer;
+
+use crate::consts::{constant, Constant};
+use crate::ty::{can_partially_move_ty, expr_sig, is_copy, is_recursively_primitive_type, ty_is_fn_once_param};
+use crate::visitors::expr_visitor_no_bodies;
+
+pub fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Option<RustcVersion> {
+ if let Ok(version) = RustcVersion::parse(msrv) {
+ return Some(version);
+ } else if let Some(sess) = sess {
+ if let Some(span) = span {
+ sess.span_err(span, &format!("`{}` is not a valid Rust version", msrv));
+ }
+ }
+ None
+}
+
+pub fn meets_msrv(msrv: Option<RustcVersion>, lint_msrv: RustcVersion) -> bool {
+ msrv.map_or(true, |msrv| msrv.meets(lint_msrv))
+}
+
+#[macro_export]
+macro_rules! extract_msrv_attr {
+ ($context:ident) => {
+ fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
+ let sess = rustc_lint::LintContext::sess(cx);
+ match $crate::get_unique_inner_attr(sess, attrs, "msrv") {
+ Some(msrv_attr) => {
+ if let Some(msrv) = msrv_attr.value_str() {
+ self.msrv = $crate::parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
+ } else {
+ sess.span_err(msrv_attr.span, "bad clippy attribute");
+ }
+ },
+ _ => (),
+ }
+ }
+ };
+}
+
+/// If the given expression is a local binding, find the initializer expression.
+/// If that initializer expression is another local binding, find its initializer again.
+/// This process repeats as long as possible (but usually no more than once). Initializer
+/// expressions with adjustments are ignored. If this is not desired, use [`find_binding_init`]
+/// instead.
+///
+/// Examples:
+/// ```
+/// let abc = 1;
+/// // ^ output
+/// let def = abc;
+/// dbg!(def);
+/// // ^^^ input
+///
+/// // or...
+/// let abc = 1;
+/// let def = abc + 2;
+/// // ^^^^^^^ output
+/// dbg!(def);
+/// // ^^^ input
+/// ```
+pub fn expr_or_init<'a, 'b, 'tcx: 'b>(cx: &LateContext<'tcx>, mut expr: &'a Expr<'b>) -> &'a Expr<'b> {
+ while let Some(init) = path_to_local(expr)
+ .and_then(|id| find_binding_init(cx, id))
+ .filter(|init| cx.typeck_results().expr_adjustments(init).is_empty())
+ {
+ expr = init;
+ }
+ expr
+}
+
+/// Finds the initializer expression for a local binding. Returns `None` if the binding is mutable.
+/// By only considering immutable bindings, we guarantee that the returned expression represents the
+/// value of the binding wherever it is referenced.
+///
+/// Example: For `let x = 1`, if the `HirId` of `x` is provided, the `Expr` `1` is returned.
+/// Note: If you have an expression that references a binding `x`, use `path_to_local` to get the
+/// canonical binding `HirId`.
+pub fn find_binding_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
+ let hir = cx.tcx.hir();
+ if_chain! {
+ if let Some(Node::Pat(pat)) = hir.find(hir_id);
+ if matches!(pat.kind, PatKind::Binding(BindingAnnotation::Unannotated, ..));
+ let parent = hir.get_parent_node(hir_id);
+ if let Some(Node::Local(local)) = hir.find(parent);
+ then {
+ return local.init;
+ }
+ }
+ None
+}
+
+/// Returns `true` if the given `NodeId` is inside a constant context
+///
+/// # Example
+///
+/// ```rust,ignore
+/// if in_constant(cx, expr.hir_id) {
+/// // Do something
+/// }
+/// ```
+pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool {
+ let parent_id = cx.tcx.hir().get_parent_item(id);
+ match cx.tcx.hir().get_by_def_id(parent_id) {
+ Node::Item(&Item {
+ kind: ItemKind::Const(..) | ItemKind::Static(..),
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ ..
+ })
+ | Node::AnonConst(_) => true,
+ Node::Item(&Item {
+ kind: ItemKind::Fn(ref sig, ..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(ref sig, _),
+ ..
+ }) => sig.header.constness == Constness::Const,
+ _ => false,
+ }
+}
+
+/// Checks if a `QPath` resolves to a constructor of a `LangItem`.
+/// For example, use this to check whether a function call or a pattern is `Some(..)`.
+pub fn is_lang_ctor(cx: &LateContext<'_>, qpath: &QPath<'_>, lang_item: LangItem) -> bool {
+ if let QPath::Resolved(_, path) = qpath {
+ if let Res::Def(DefKind::Ctor(..), ctor_id) = path.res {
+ if let Ok(item_id) = cx.tcx.lang_items().require(lang_item) {
+ return cx.tcx.parent(ctor_id) == item_id;
+ }
+ }
+ }
+ false
+}
+
+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_expr_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 the expression is a path, resolves it to a `DefId` and checks if it matches the given
+/// diagnostic item.
+pub fn is_expr_diagnostic_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ path_def_id(cx, expr).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()
+}
+
+/// Resolves a def path like `std::vec::Vec`.
+/// This function is expensive and should be used sparingly.
+pub fn def_path_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
+ fn item_child_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: &str) -> Option<Res> {
+ match tcx.def_kind(def_id) {
+ DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
+ .module_children(def_id)
+ .iter()
+ .find(|item| item.ident.name.as_str() == name)
+ .map(|child| child.res.expect_non_local()),
+ DefKind::Impl => tcx
+ .associated_item_def_ids(def_id)
+ .iter()
+ .copied()
+ .find(|assoc_def_id| tcx.item_name(*assoc_def_id).as_str() == name)
+ .map(|assoc_def_id| Res::Def(tcx.def_kind(assoc_def_id), assoc_def_id)),
+ _ => None,
+ }
+ }
+ fn find_primitive<'tcx>(tcx: TyCtxt<'tcx>, name: &str) -> impl Iterator<Item = DefId> + 'tcx {
+ let single = |ty| tcx.incoherent_impls(ty).iter().copied();
+ let empty = || [].iter().copied();
+ match name {
+ "bool" => single(BoolSimplifiedType),
+ "char" => single(CharSimplifiedType),
+ "str" => single(StrSimplifiedType),
+ "array" => single(ArraySimplifiedType),
+ "slice" => single(SliceSimplifiedType),
+ // FIXME: rustdoc documents these two using just `pointer`.
+ //
+ // Maybe this is something we should do here too.
+ "const_ptr" => single(PtrSimplifiedType(Mutability::Not)),
+ "mut_ptr" => single(PtrSimplifiedType(Mutability::Mut)),
+ "isize" => single(IntSimplifiedType(IntTy::Isize)),
+ "i8" => single(IntSimplifiedType(IntTy::I8)),
+ "i16" => single(IntSimplifiedType(IntTy::I16)),
+ "i32" => single(IntSimplifiedType(IntTy::I32)),
+ "i64" => single(IntSimplifiedType(IntTy::I64)),
+ "i128" => single(IntSimplifiedType(IntTy::I128)),
+ "usize" => single(UintSimplifiedType(UintTy::Usize)),
+ "u8" => single(UintSimplifiedType(UintTy::U8)),
+ "u16" => single(UintSimplifiedType(UintTy::U16)),
+ "u32" => single(UintSimplifiedType(UintTy::U32)),
+ "u64" => single(UintSimplifiedType(UintTy::U64)),
+ "u128" => single(UintSimplifiedType(UintTy::U128)),
+ "f32" => single(FloatSimplifiedType(FloatTy::F32)),
+ "f64" => single(FloatSimplifiedType(FloatTy::F64)),
+ _ => empty(),
+ }
+ }
+ fn find_crate(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
+ tcx.crates(())
+ .iter()
+ .copied()
+ .find(|&num| tcx.crate_name(num).as_str() == name)
+ .map(CrateNum::as_def_id)
+ }
+
+ let (base, first, path) = match *path {
+ [base, first, ref path @ ..] => (base, first, path),
+ [primitive] => {
+ return PrimTy::from_name(Symbol::intern(primitive)).map_or(Res::Err, Res::PrimTy);
+ },
+ _ => return Res::Err,
+ };
+ let tcx = cx.tcx;
+ let starts = find_primitive(tcx, base)
+ .chain(find_crate(tcx, base))
+ .filter_map(|id| item_child_by_name(tcx, id, first));
+
+ for first in starts {
+ let last = path
+ .iter()
+ .copied()
+ // for each segment, find the child item
+ .try_fold(first, |res, segment| {
+ let def_id = res.def_id();
+ if let Some(item) = item_child_by_name(tcx, def_id, segment) {
+ Some(item)
+ } else if matches!(res, Res::Def(DefKind::Enum | DefKind::Struct, _)) {
+ // it is not a child item so check inherent impl items
+ tcx.inherent_impls(def_id)
+ .iter()
+ .find_map(|&impl_def_id| item_child_by_name(tcx, impl_def_id, segment))
+ } else {
+ None
+ }
+ });
+
+ if let Some(last) = last {
+ return last;
+ }
+ }
+
+ Res::Err
+}
+
+/// Convenience function to get the `DefId` of a trait by path.
+/// It could be a trait or trait alias.
+pub fn get_trait_def_id(cx: &LateContext<'_>, path: &[&str]) -> Option<DefId> {
+ match def_path_res(cx, path) {
+ 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 != CRATE_DEF_ID;
+ if let hir::Node::Item(item) = cx.tcx.hir().get_by_def_id(parent_impl);
+ if let hir::ItemKind::Impl(impl_) = &item.kind;
+ then {
+ return impl_.of_trait.as_ref();
+ }
+ }
+ None
+}
+
+/// This method will return tuple of projection stack and root of the expression,
+/// used in `can_mut_borrow_both`.
+///
+/// For example, if `e` represents the `v[0].a.b[x]`
+/// this method will return a tuple, composed of a `Vec`
+/// containing the `Expr`s for `v[0], v[0].a, v[0].a.b, v[0].a.b[x]`
+/// and an `Expr` for root of them, `v`
+fn projection_stack<'a, 'hir>(mut e: &'a Expr<'hir>) -> (Vec<&'a Expr<'hir>>, &'a Expr<'hir>) {
+ let mut result = vec![];
+ let root = loop {
+ match e.kind {
+ ExprKind::Index(ep, _) | ExprKind::Field(ep, _) => {
+ result.push(e);
+ e = ep;
+ },
+ _ => break e,
+ };
+ };
+ result.reverse();
+ (result, root)
+}
+
+/// Gets the mutability of the custom deref adjustment, if any.
+pub fn expr_custom_deref_adjustment(cx: &LateContext<'_>, e: &Expr<'_>) -> Option<Mutability> {
+ cx.typeck_results()
+ .expr_adjustments(e)
+ .iter()
+ .find_map(|a| match a.kind {
+ Adjust::Deref(Some(d)) => Some(Some(d.mutbl)),
+ Adjust::Deref(None) => None,
+ _ => Some(None),
+ })
+ .and_then(|x| x)
+}
+
+/// Checks if two expressions can be mutably borrowed simultaneously
+/// and they aren't dependent on borrowing same thing twice
+pub fn can_mut_borrow_both(cx: &LateContext<'_>, e1: &Expr<'_>, e2: &Expr<'_>) -> bool {
+ let (s1, r1) = projection_stack(e1);
+ let (s2, r2) = projection_stack(e2);
+ if !eq_expr_value(cx, r1, r2) {
+ return true;
+ }
+ if expr_custom_deref_adjustment(cx, r1).is_some() || expr_custom_deref_adjustment(cx, r2).is_some() {
+ return false;
+ }
+
+ for (x1, x2) in s1.iter().zip(s2.iter()) {
+ if expr_custom_deref_adjustment(cx, x1).is_some() || expr_custom_deref_adjustment(cx, x2).is_some() {
+ return false;
+ }
+
+ match (&x1.kind, &x2.kind) {
+ (ExprKind::Field(_, i1), ExprKind::Field(_, i2)) => {
+ if i1 != i2 {
+ return true;
+ }
+ },
+ (ExprKind::Index(_, i1), ExprKind::Index(_, i2)) => {
+ if !eq_expr_value(cx, i1, i2) {
+ return false;
+ }
+ },
+ _ => return false,
+ }
+ }
+ false
+}
+
+/// Returns true if the `def_id` associated with the `path` is recognized as a "default-equivalent"
+/// constructor from the std library
+fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<'_>) -> bool {
+ let std_types_symbols = &[
+ sym::String,
+ sym::Vec,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::HashMap,
+ sym::BTreeMap,
+ sym::HashSet,
+ sym::BTreeSet,
+ sym::BinaryHeap,
+ ];
+
+ if let QPath::TypeRelative(_, method) = path {
+ if method.ident.name == sym::new {
+ if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
+ if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
+ return std_types_symbols
+ .iter()
+ .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did()));
+ }
+ }
+ }
+ }
+ false
+}
+
+/// Return true if the expr is equal to `Default::default` when evaluated.
+pub fn is_default_equivalent_call(cx: &LateContext<'_>, repl_func: &Expr<'_>) -> bool {
+ if_chain! {
+ if let hir::ExprKind::Path(ref repl_func_qpath) = repl_func.kind;
+ if let Some(repl_def_id) = cx.qpath_res(repl_func_qpath, repl_func.hir_id).opt_def_id();
+ if is_diag_trait_item(cx, repl_def_id, sym::Default)
+ || is_default_equivalent_ctor(cx, repl_def_id, repl_func_qpath);
+ then { true } else { false }
+ }
+}
+
+/// Returns true if the expr is equal to `Default::default()` of it's type when evaluated.
+/// It doesn't cover all cases, for example indirect function calls (some of std
+/// functions are supported) but it is the best we have.
+pub fn is_default_equivalent(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ match &e.kind {
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Bool(false) | LitKind::Int(0, _) => true,
+ LitKind::Str(s, _) => s.is_empty(),
+ _ => false,
+ },
+ ExprKind::Tup(items) | ExprKind::Array(items) => items.iter().all(|x| is_default_equivalent(cx, x)),
+ ExprKind::Repeat(x, ArrayLen::Body(len)) => if_chain! {
+ if let ExprKind::Lit(ref const_lit) = cx.tcx.hir().body(len.body).value.kind;
+ if let LitKind::Int(v, _) = const_lit.node;
+ if v <= 32 && is_default_equivalent(cx, x);
+ then {
+ true
+ }
+ else {
+ false
+ }
+ },
+ ExprKind::Call(repl_func, _) => is_default_equivalent_call(cx, repl_func),
+ ExprKind::Path(qpath) => is_lang_ctor(cx, qpath, OptionNone),
+ ExprKind::AddrOf(rustc_hir::BorrowKind::Ref, _, expr) => matches!(expr.kind, ExprKind::Array([])),
+ _ => false,
+ }
+}
+
+/// Checks if the top level expression can be moved into a closure as is.
+/// Currently checks for:
+/// * Break/Continue outside the given loop HIR ids.
+/// * Yield/Return statements.
+/// * Inline assembly.
+/// * Usages of a field of a local where the type of the local can be partially moved.
+///
+/// For example, given the following function:
+///
+/// ```
+/// fn f<'a>(iter: &mut impl Iterator<Item = (usize, &'a mut String)>) {
+/// for item in iter {
+/// let s = item.1;
+/// if item.0 > 10 {
+/// continue;
+/// } else {
+/// s.clear();
+/// }
+/// }
+/// }
+/// ```
+///
+/// When called on the expression `item.0` this will return false unless the local `item` is in the
+/// `ignore_locals` set. The type `(usize, &mut String)` can have the second element moved, so it
+/// isn't always safe to move into a closure when only a single field is needed.
+///
+/// When called on the `continue` expression this will return false unless the outer loop expression
+/// is in the `loop_ids` set.
+///
+/// Note that this check is not recursive, so passing the `if` expression will always return true
+/// even though sub-expressions might return false.
+pub fn can_move_expr_to_closure_no_visit<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ loop_ids: &[HirId],
+ ignore_locals: &HirIdSet,
+) -> bool {
+ match expr.kind {
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _)
+ | ExprKind::Continue(Destination { target_id: Ok(id), .. })
+ if loop_ids.contains(&id) =>
+ {
+ true
+ },
+ ExprKind::Break(..)
+ | ExprKind::Continue(_)
+ | ExprKind::Ret(_)
+ | ExprKind::Yield(..)
+ | ExprKind::InlineAsm(_) => false,
+ // Accessing a field of a local value can only be done if the type isn't
+ // partially moved.
+ ExprKind::Field(
+ &Expr {
+ hir_id,
+ kind:
+ ExprKind::Path(QPath::Resolved(
+ _,
+ Path {
+ res: Res::Local(local_id),
+ ..
+ },
+ )),
+ ..
+ },
+ _,
+ ) if !ignore_locals.contains(local_id) && can_partially_move_ty(cx, cx.typeck_results().node_type(hir_id)) => {
+ // TODO: check if the local has been partially moved. Assume it has for now.
+ false
+ },
+ _ => true,
+ }
+}
+
+/// How a local is captured by a closure
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CaptureKind {
+ Value,
+ Ref(Mutability),
+}
+impl CaptureKind {
+ pub fn is_imm_ref(self) -> bool {
+ self == Self::Ref(Mutability::Not)
+ }
+}
+impl std::ops::BitOr for CaptureKind {
+ type Output = Self;
+ fn bitor(self, rhs: Self) -> Self::Output {
+ match (self, rhs) {
+ (CaptureKind::Value, _) | (_, CaptureKind::Value) => CaptureKind::Value,
+ (CaptureKind::Ref(Mutability::Mut), CaptureKind::Ref(_))
+ | (CaptureKind::Ref(_), CaptureKind::Ref(Mutability::Mut)) => CaptureKind::Ref(Mutability::Mut),
+ (CaptureKind::Ref(Mutability::Not), CaptureKind::Ref(Mutability::Not)) => CaptureKind::Ref(Mutability::Not),
+ }
+ }
+}
+impl std::ops::BitOrAssign for CaptureKind {
+ fn bitor_assign(&mut self, rhs: Self) {
+ *self = *self | rhs;
+ }
+}
+
+/// Given an expression referencing a local, determines how it would be captured in a closure.
+/// Note as this will walk up to parent expressions until the capture can be determined it should
+/// only be used while making a closure somewhere a value is consumed. e.g. a block, match arm, or
+/// function argument (other than a receiver).
+pub fn capture_local_usage<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind {
+ fn pat_capture_kind(cx: &LateContext<'_>, pat: &Pat<'_>) -> CaptureKind {
+ let mut capture = CaptureKind::Ref(Mutability::Not);
+ pat.each_binding_or_first(&mut |_, id, span, _| match cx
+ .typeck_results()
+ .extract_binding_mode(cx.sess(), id, span)
+ .unwrap()
+ {
+ BindingMode::BindByValue(_) if !is_copy(cx, cx.typeck_results().node_type(id)) => {
+ capture = CaptureKind::Value;
+ },
+ BindingMode::BindByReference(Mutability::Mut) if capture != CaptureKind::Value => {
+ capture = CaptureKind::Ref(Mutability::Mut);
+ },
+ _ => (),
+ });
+ capture
+ }
+
+ debug_assert!(matches!(
+ e.kind,
+ ExprKind::Path(QPath::Resolved(None, Path { res: Res::Local(_), .. }))
+ ));
+
+ let mut child_id = e.hir_id;
+ let mut capture = CaptureKind::Value;
+ let mut capture_expr_ty = e;
+
+ for (parent_id, parent) in cx.tcx.hir().parent_iter(e.hir_id) {
+ if let [
+ Adjustment {
+ kind: Adjust::Deref(_) | Adjust::Borrow(AutoBorrow::Ref(..)),
+ target,
+ },
+ ref adjust @ ..,
+ ] = *cx
+ .typeck_results()
+ .adjustments()
+ .get(child_id)
+ .map_or(&[][..], |x| &**x)
+ {
+ if let rustc_ty::RawPtr(TypeAndMut { mutbl: mutability, .. }) | rustc_ty::Ref(_, _, mutability) =
+ *adjust.last().map_or(target, |a| a.target).kind()
+ {
+ return CaptureKind::Ref(mutability);
+ }
+ }
+
+ match parent {
+ Node::Expr(e) => match e.kind {
+ ExprKind::AddrOf(_, mutability, _) => return CaptureKind::Ref(mutability),
+ ExprKind::Index(..) | ExprKind::Unary(UnOp::Deref, _) => capture = CaptureKind::Ref(Mutability::Not),
+ ExprKind::Assign(lhs, ..) | ExprKind::AssignOp(_, lhs, _) if lhs.hir_id == child_id => {
+ return CaptureKind::Ref(Mutability::Mut);
+ },
+ ExprKind::Field(..) => {
+ if capture == CaptureKind::Value {
+ capture_expr_ty = e;
+ }
+ },
+ ExprKind::Let(let_expr) => {
+ let mutability = match pat_capture_kind(cx, let_expr.pat) {
+ CaptureKind::Value => Mutability::Not,
+ CaptureKind::Ref(m) => m,
+ };
+ return CaptureKind::Ref(mutability);
+ },
+ ExprKind::Match(_, arms, _) => {
+ let mut mutability = Mutability::Not;
+ for capture in arms.iter().map(|arm| pat_capture_kind(cx, arm.pat)) {
+ match capture {
+ CaptureKind::Value => break,
+ CaptureKind::Ref(Mutability::Mut) => mutability = Mutability::Mut,
+ CaptureKind::Ref(Mutability::Not) => (),
+ }
+ }
+ return CaptureKind::Ref(mutability);
+ },
+ _ => break,
+ },
+ Node::Local(l) => match pat_capture_kind(cx, l.pat) {
+ CaptureKind::Value => break,
+ capture @ CaptureKind::Ref(_) => return capture,
+ },
+ _ => break,
+ }
+
+ child_id = parent_id;
+ }
+
+ if capture == CaptureKind::Value && is_copy(cx, cx.typeck_results().expr_ty(capture_expr_ty)) {
+ // Copy types are never automatically captured by value.
+ CaptureKind::Ref(Mutability::Not)
+ } else {
+ capture
+ }
+}
+
+/// Checks if the expression can be moved into a closure as is. This will return a list of captures
+/// if so, otherwise, `None`.
+pub fn can_move_expr_to_closure<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<HirIdMap<CaptureKind>> {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ // Stack of potential break targets contained in the expression.
+ loops: Vec<HirId>,
+ /// Local variables created in the expression. These don't need to be captured.
+ locals: HirIdSet,
+ /// Whether this expression can be turned into a closure.
+ allow_closure: bool,
+ /// Locals which need to be captured, and whether they need to be by value, reference, or
+ /// mutable reference.
+ captures: HirIdMap<CaptureKind>,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !self.allow_closure {
+ return;
+ }
+
+ match e.kind {
+ ExprKind::Path(QPath::Resolved(None, &Path { res: Res::Local(l), .. })) => {
+ if !self.locals.contains(&l) {
+ let cap = capture_local_usage(self.cx, e);
+ self.captures.entry(l).and_modify(|e| *e |= cap).or_insert(cap);
+ }
+ },
+ ExprKind::Closure { .. } => {
+ let closure_id = self.cx.tcx.hir().local_def_id(e.hir_id).to_def_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)
+}
+
+/// 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>, Vec<&'tcx [Expr<'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, args, _) = ¤t.kind {
+ if args.iter().any(|e| e.span.from_expansion()) {
+ break;
+ }
+ method_names.push(path.ident.name);
+ arg_lists.push(&**args);
+ spans.push(path.ident.span);
+ current = &args[0];
+ } 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>]>> {
+ 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, args, _) = current.kind {
+ if path.ident.name.as_str() == *method_name {
+ if args.iter().any(|e| e.span.from_expansion()) {
+ return None;
+ }
+ matched.push(args); // build up `matched` backwards
+ current = &args[0]; // 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);
+ match cx.tcx.hir().find_by_def_id(parent_id) {
+ Some(
+ Node::Item(Item { ident, .. })
+ | Node::TraitItem(TraitItem { ident, .. })
+ | Node::ImplItem(ImplItem { ident, .. }),
+ ) => Some(ident.name),
+ _ => None,
+ }
+}
+
+pub struct ContainsName {
+ pub name: Symbol,
+ pub result: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for ContainsName {
+ fn visit_name(&mut self, _: Span, name: Symbol) {
+ if self.name == name {
+ self.result = true;
+ }
+ }
+}
+
+/// Checks if an `Expr` contains a certain name.
+pub fn contains_name(name: Symbol, expr: &Expr<'_>) -> bool {
+ let mut cn = ContainsName { name, result: false };
+ cn.visit_expr(expr);
+ cn.result
+}
+
+/// Returns `true` if `expr` contains a return expression
+pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
+ let mut found = false;
+ expr_visitor_no_bodies(|expr| {
+ if !found {
+ if let hir::ExprKind::Ret(..) = &expr.kind {
+ found = true;
+ }
+ }
+ !found
+ })
+ .visit_expr(expr);
+ found
+}
+
+/// Extends the span to the beginning of the spans line, incl. whitespaces.
+///
+/// ```rust
+/// let x = ();
+/// // ^^
+/// // will be converted to
+/// let x = ();
+/// // ^^^^^^^^^^^^^^
+/// ```
+fn line_span<T: LintContext>(cx: &T, span: Span) -> Span {
+ let span = original_sp(span, DUMMY_SP);
+ let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
+ let line_no = source_map_and_line.line;
+ let line_start = source_map_and_line.sf.lines(|lines| lines[line_no]);
+ span.with_lo(line_start)
+}
+
+/// Gets the parent node, if any.
+pub fn get_parent_node(tcx: TyCtxt<'_>, id: HirId) -> Option<Node<'_>> {
+ tcx.hir().parent_iter(id).next().map(|(_, node)| node)
+}
+
+/// Gets the parent expression, if any –- this is useful to constrain a lint.
+pub fn get_parent_expr<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+ get_parent_expr_for_hir(cx, e.hir_id)
+}
+
+/// This retrieves the parent for the given `HirId` if it's an expression. This is useful for
+/// constraint lints
+pub fn get_parent_expr_for_hir<'tcx>(cx: &LateContext<'tcx>, hir_id: hir::HirId) -> Option<&'tcx Expr<'tcx>> {
+ match get_parent_node(cx.tcx, hir_id) {
+ Some(Node::Expr(parent)) => Some(parent),
+ _ => None,
+ }
+}
+
+pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Block<'tcx>> {
+ let map = &cx.tcx.hir();
+ let enclosing_node = map
+ .get_enclosing_scope(hir_id)
+ .and_then(|enclosing_id| map.find(enclosing_id));
+ enclosing_node.and_then(|node| match node {
+ Node::Block(block) => Some(block),
+ Node::Item(&Item {
+ kind: ItemKind::Fn(_, _, eid),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(_, eid),
+ ..
+ }) => match cx.tcx.hir().body(eid).value.kind {
+ ExprKind::Block(block, _) => Some(block),
+ _ => None,
+ },
+ _ => None,
+ })
+}
+
+/// Gets the loop or closure enclosing the given expression, if any.
+pub fn get_enclosing_loop_or_multi_call_closure<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &Expr<'_>,
+) -> Option<&'tcx Expr<'tcx>> {
+ for (_, node) in cx.tcx.hir().parent_iter(expr.hir_id) {
+ match node {
+ Node::Expr(e) => match e.kind {
+ ExprKind::Closure { .. } => {
+ if let rustc_ty::Closure(_, subs) = cx.typeck_results().expr_ty(e).kind()
+ && subs.as_closure().kind() == ClosureKind::FnOnce
+ {
+ continue;
+ }
+ let is_once = walk_to_expr_usage(cx, e, |node, id| {
+ let Node::Expr(e) = node else {
+ return None;
+ };
+ match e.kind {
+ ExprKind::Call(f, _) if f.hir_id == id => Some(()),
+ ExprKind::Call(f, args) => {
+ let i = args.iter().position(|arg| arg.hir_id == id)?;
+ let sig = expr_sig(cx, f)?;
+ let predicates = sig
+ .predicates_id()
+ .map_or(cx.param_env, |id| cx.tcx.param_env(id))
+ .caller_bounds();
+ sig.input(i).and_then(|ty| {
+ ty_is_fn_once_param(cx.tcx, ty.skip_binder(), predicates).then_some(())
+ })
+ },
+ ExprKind::MethodCall(_, args, _) => {
+ let i = 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().local_def_id(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_typeck::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::SelfTy { .. } = 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, None) = arm.pat.kind;
+ if is_lang_ctor(cx, path, 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_lang_ctor(cx, path, ResultErr)
+ } else {
+ false
+ }
+ }
+
+ if let ExprKind::Match(_, arms, ref source) = expr.kind {
+ // desugared from a `?` operator
+ if *source == MatchSource::TryDesugar {
+ return Some(expr);
+ }
+
+ if_chain! {
+ if arms.len() == 2;
+ if arms[0].guard.is_none();
+ if arms[1].guard.is_none();
+ if (is_ok(cx, &arms[0]) && is_err(cx, &arms[1])) || (is_ok(cx, &arms[1]) && is_err(cx, &arms[0]));
+ then {
+ return Some(expr);
+ }
+ }
+ }
+
+ None
+}
+
+/// Returns `true` if the lint is allowed in the current context. This is useful for
+/// skipping long running code when it's unnecessary
+///
+/// This function should check the lint level for the same node, that the lint will
+/// be emitted at. If the information is buffered to be emitted at a later point, please
+/// make sure to use `span_lint_hir` functions to emit the lint. This ensures that
+/// expectations at the checked nodes will be fulfilled.
+pub fn is_lint_allowed(cx: &LateContext<'_>, lint: &'static Lint, id: HirId) -> bool {
+ cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow
+}
+
+pub fn strip_pat_refs<'hir>(mut pat: &'hir Pat<'hir>) -> &'hir Pat<'hir> {
+ while let PatKind::Ref(subpat, _) = pat.kind {
+ pat = subpat;
+ }
+ pat
+}
+
+pub fn int_bits(tcx: TyCtxt<'_>, ity: rustc_ty::IntTy) -> u64 {
+ Integer::from_int_ty(&tcx, ity).size().bits()
+}
+
+#[expect(clippy::cast_possible_wrap)]
+/// Turn a constant int byte representation into an i128
+pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::IntTy) -> i128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as i128) << amt) >> amt
+}
+
+#[expect(clippy::cast_sign_loss)]
+/// clip unused bytes
+pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: rustc_ty::IntTy) -> u128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as u128) << amt) >> amt
+}
+
+/// clip unused bytes
+pub fn clip(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::UintTy) -> u128 {
+ let bits = Integer::from_uint_ty(&tcx, ity).size().bits();
+ let amt = 128 - bits;
+ (u << amt) >> amt
+}
+
+pub fn has_attr(attrs: &[ast::Attribute], symbol: Symbol) -> bool {
+ attrs.iter().any(|attr| attr.has_name(symbol))
+}
+
+pub fn any_parent_has_attr(tcx: TyCtxt<'_>, node: HirId, symbol: Symbol) -> bool {
+ let map = &tcx.hir();
+ let mut prev_enclosing_node = None;
+ let mut enclosing_node = node;
+ while Some(enclosing_node) != prev_enclosing_node {
+ if has_attr(map.attrs(enclosing_node), symbol) {
+ return true;
+ }
+ prev_enclosing_node = Some(enclosing_node);
+ enclosing_node = map.local_def_id_to_hir_id(map.get_parent_item(enclosing_node));
+ }
+
+ 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);
+/// ```
+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
+}
+
+/// Checks if the given `DefId` matches any of the paths. Returns the index of matching path, if
+/// any.
+///
+/// Please use `tcx.get_diagnostic_name` if the targets are all diagnostic items.
+pub fn match_any_def_paths(cx: &LateContext<'_>, did: DefId, paths: &[&[&str]]) -> Option<usize> {
+ let search_path = cx.get_def_path(did);
+ paths
+ .iter()
+ .position(|p| p.iter().map(|x| Symbol::intern(x)).eq(search_path.iter().copied()))
+}
+
+/// Checks if the given `DefId` matches the path.
+pub fn match_def_path<'tcx>(cx: &LateContext<'tcx>, did: DefId, syms: &[&str]) -> bool {
+ // We should probably move to Symbols in Clippy as well rather than interning every time.
+ let path = cx.get_def_path(did);
+ syms.iter().map(|x| Symbol::intern(x)).eq(path.iter().copied())
+}
+
+/// Checks if the given `DefId` matches the `libc` item.
+pub fn match_libc_symbol(cx: &LateContext<'_>, did: DefId, name: &str) -> bool {
+ let path = cx.get_def_path(did);
+ // libc is meant to be used as a flat list of names, but they're all actually defined in different
+ // modules based on the target platform. Ignore everything but crate name and the item name.
+ path.first().map_or(false, |s| s.as_str() == "libc") && path.last().map_or(false, |s| s.as_str() == name)
+}
+
+/// Returns the list of condition expressions and the list of blocks in a
+/// sequence of `if/else`.
+/// E.g., this returns `([a, b], [c, d, e])` for the expression
+/// `if a { c } else if b { d } else { e }`.
+pub fn if_sequence<'tcx>(mut expr: &'tcx Expr<'tcx>) -> (Vec<&'tcx Expr<'tcx>>, Vec<&'tcx Block<'tcx>>) {
+ let mut conds = Vec::new();
+ let mut blocks: Vec<&Block<'_>> = Vec::new();
+
+ while let Some(higher::IfOrIfLet { cond, then, r#else }) = higher::IfOrIfLet::hir(expr) {
+ conds.push(cond);
+ if let ExprKind::Block(block, _) = then.kind {
+ blocks.push(block);
+ } else {
+ panic!("ExprKind::If node is not an ExprKind::Block");
+ }
+
+ if let Some(else_expr) = r#else {
+ expr = else_expr;
+ } else {
+ break;
+ }
+ }
+
+ // final `else {..}`
+ if !blocks.is_empty() {
+ if let ExprKind::Block(block, _) = expr.kind {
+ blocks.push(block);
+ }
+ }
+
+ (conds, blocks)
+}
+
+/// Checks if the given function kind is an async function.
+pub fn is_async_fn(kind: FnKind<'_>) -> bool {
+ matches!(kind, FnKind::ItemFn(_, _, header) if header.asyncness == IsAsync::Async)
+}
+
+/// Peels away all the compiler generated code surrounding the body of an async function,
+pub fn get_async_fn_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Option<&'tcx Expr<'tcx>> {
+ if let ExprKind::Call(
+ _,
+ &[
+ Expr {
+ kind: ExprKind::Closure(&Closure { body, .. }),
+ ..
+ },
+ ],
+ ) = body.value.kind
+ {
+ if let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr:
+ Some(Expr {
+ kind: ExprKind::DropTemps(expr),
+ ..
+ }),
+ ..
+ },
+ _,
+ ) = tcx.hir().body(body).value.kind
+ {
+ return Some(expr);
+ }
+ };
+ None
+}
+
+// check if expr is calling method or function with #[must_use] attribute
+pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ let did = match expr.kind {
+ ExprKind::Call(path, _) => if_chain! {
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let def::Res::Def(_, did) = cx.qpath_res(qpath, path.hir_id);
+ then {
+ Some(did)
+ } else {
+ None
+ }
+ },
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ _ => None,
+ };
+
+ did.map_or(false, |did| cx.tcx.has_attr(did, sym::must_use))
+}
+
+/// Checks if an expression represents the identity function
+/// Only examines closures and `std::convert::identity`
+pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ /// Checks if a function's body represents the identity function. Looks for bodies of the form:
+ /// * `|x| x`
+ /// * `|x| return x`
+ /// * `|x| { return x }`
+ /// * `|x| { return x; }`
+ fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
+ let id = if_chain! {
+ if let [param] = func.params;
+ if let PatKind::Binding(_, id, _, _) = param.pat.kind;
+ then {
+ id
+ } else {
+ return false;
+ }
+ };
+
+ let mut expr = &func.value;
+ loop {
+ match expr.kind {
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [], expr: Some(e), .. }, _, )
+ | ExprKind::Ret(Some(e)) => expr = e,
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [stmt], expr: None, .. }, _) => {
+ if_chain! {
+ if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
+ if let ExprKind::Ret(Some(ret_val)) = e.kind;
+ then {
+ expr = ret_val;
+ } else {
+ return false;
+ }
+ }
+ },
+ _ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
+ }
+ }
+ }
+
+ match expr.kind {
+ ExprKind::Closure(&Closure { body, .. }) => is_body_identity_function(cx, cx.tcx.hir().body(body)),
+ _ => path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, &paths::CONVERT_IDENTITY)),
+ }
+}
+
+/// Gets the node where an expression is either used, or it's type is unified with another branch.
+/// Returns both the node and the `HirId` of the closest child node.
+pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<(Node<'tcx>, HirId)> {
+ let mut child_id = expr.hir_id;
+ let mut iter = tcx.hir().parent_iter(child_id);
+ loop {
+ match iter.next() {
+ None => break None,
+ Some((id, Node::Block(_))) => child_id = id,
+ Some((id, Node::Arm(arm))) if arm.body.hir_id == child_id => child_id = id,
+ Some((_, Node::Expr(expr))) => match expr.kind {
+ ExprKind::Match(_, [arm], _) if arm.hir_id == child_id => child_id = expr.hir_id,
+ ExprKind::Block(..) | ExprKind::DropTemps(_) => child_id = expr.hir_id,
+ ExprKind::If(_, then_expr, None) if then_expr.hir_id == child_id => break None,
+ _ => break Some((Node::Expr(expr), child_id)),
+ },
+ Some((_, node)) => break Some((node, child_id)),
+ }
+ }
+}
+
+/// Checks if the result of an expression is used, or it's type is unified with another branch.
+pub fn is_expr_used_or_unified(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ !matches!(
+ get_expr_use_or_unification_node(tcx, expr),
+ None | Some((
+ Node::Stmt(Stmt {
+ kind: StmtKind::Expr(_)
+ | StmtKind::Semi(_)
+ | StmtKind::Local(Local {
+ pat: Pat {
+ kind: PatKind::Wild,
+ ..
+ },
+ ..
+ }),
+ ..
+ }),
+ _
+ ))
+ )
+}
+
+/// Checks if the expression is the final expression returned from a block.
+pub fn is_expr_final_block_expr(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ matches!(get_parent_node(tcx, expr.hir_id), Some(Node::Block(..)))
+}
+
+pub fn std_or_core(cx: &LateContext<'_>) -> Option<&'static str> {
+ if !is_no_std_crate(cx) {
+ Some("std")
+ } else if !is_no_core_crate(cx) {
+ Some("core")
+ } else {
+ None
+ }
+}
+
+pub fn is_no_std_crate(cx: &LateContext<'_>) -> bool {
+ cx.tcx.hir().attrs(hir::CRATE_HIR_ID).iter().any(|attr| {
+ if let ast::AttrKind::Normal(ref attr, _) = attr.kind {
+ attr.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 attr, _) = attr.kind {
+ attr.path == sym::no_core
+ } else {
+ false
+ }
+ })
+}
+
+/// Check if parent of a hir node is a trait implementation block.
+/// For example, `f` in
+/// ```rust
+/// # struct S;
+/// # trait Trait { fn f(); }
+/// impl Trait for S {
+/// fn f() {}
+/// }
+/// ```
+pub fn is_trait_impl_item(cx: &LateContext<'_>, hir_id: HirId) -> bool {
+ if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+ matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+ } else {
+ false
+ }
+}
+
+/// Check if it's even possible to satisfy the `where` clause for the item.
+///
+/// `trivial_bounds` feature allows functions with unsatisfiable bounds, for example:
+///
+/// ```ignore
+/// fn foo() where i32: Iterator {
+/// for _ in 2i32 {}
+/// }
+/// ```
+pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_>, did: DefId) -> bool {
+ use rustc_trait_selection::traits;
+ let predicates = cx
+ .tcx
+ .predicates_of(did)
+ .predicates
+ .iter()
+ .filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None });
+ traits::impossible_predicates(
+ cx.tcx,
+ traits::elaborate_predicates(cx.tcx, predicates)
+ .map(|o| o.predicate)
+ .collect::<Vec<_>>(),
+ )
+}
+
+/// Returns the `DefId` of the callee if the given expression is a function or method call.
+pub fn fn_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<DefId> {
+ match &expr.kind {
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(qpath),
+ hir_id: path_hir_id,
+ ..
+ },
+ ..,
+ ) => {
+ // Only return Fn-like DefIds, not the DefIds of statics/consts/etc that contain or
+ // deref to fn pointers, dyn Fn, impl Fn - #8850
+ if let Res::Def(DefKind::Fn | DefKind::Ctor(..) | DefKind::AssocFn, id) =
+ cx.typeck_results().qpath_res(qpath, *path_hir_id)
+ {
+ Some(id)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Returns Option<String> where String is a textual representation of the type encapsulated in the
+/// slice iff the given expression is a slice of primitives (as defined in the
+/// `is_recursively_primitive_type` function) and None otherwise.
+pub fn is_slice_of_primitives(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
+ let expr_type = cx.typeck_results().expr_ty_adjusted(expr);
+ let expr_kind = expr_type.kind();
+ let is_primitive = match expr_kind {
+ rustc_ty::Slice(element_type) => is_recursively_primitive_type(*element_type),
+ rustc_ty::Ref(_, inner_ty, _) if matches!(inner_ty.kind(), &rustc_ty::Slice(_)) => {
+ if let rustc_ty::Slice(element_type) = inner_ty.kind() {
+ is_recursively_primitive_type(*element_type)
+ } else {
+ unreachable!()
+ }
+ },
+ _ => false,
+ };
+
+ if is_primitive {
+ // if we have wrappers like Array, Slice or Tuple, print these
+ // and get the type enclosed in the slice ref
+ match expr_type.peel_refs().walk().nth(1).unwrap().expect_ty().kind() {
+ rustc_ty::Slice(..) => return Some("slice".into()),
+ rustc_ty::Array(..) => return Some("array".into()),
+ rustc_ty::Tuple(..) => return Some("tuple".into()),
+ _ => {
+ // is_recursively_primitive_type() should have taken care
+ // of the rest and we can rely on the type that is found
+ let refs_peeled = expr_type.peel_refs();
+ return Some(refs_peeled.walk().last().unwrap().to_string());
+ },
+ }
+ }
+ None
+}
+
+/// returns list of all pairs (a, b) from `exprs` such that `eq(a, b)`
+/// `hash` must be comformed with `eq`
+pub fn search_same<T, Hash, Eq>(exprs: &[T], hash: Hash, eq: Eq) -> Vec<(&T, &T)>
+where
+ Hash: Fn(&T) -> u64,
+ Eq: Fn(&T, &T) -> bool,
+{
+ match exprs {
+ [a, b] if eq(a, b) => return vec![(a, b)],
+ _ if exprs.len() <= 2 => return vec![],
+ _ => {},
+ }
+
+ let mut match_expr_list: Vec<(&T, &T)> = Vec::new();
+
+ let mut map: UnhashMap<u64, Vec<&_>> =
+ UnhashMap::with_capacity_and_hasher(exprs.len(), BuildHasherDefault::default());
+
+ for expr in exprs {
+ match map.entry(hash(expr)) {
+ Entry::Occupied(mut o) => {
+ for o in o.get() {
+ if eq(o, expr) {
+ match_expr_list.push((o, expr));
+ }
+ }
+ o.get_mut().push(expr);
+ },
+ Entry::Vacant(v) => {
+ v.insert(vec![expr]);
+ },
+ }
+ }
+
+ match_expr_list
+}
+
+/// Peels off all references on the pattern. Returns the underlying pattern and the number of
+/// references removed.
+pub fn peel_hir_pat_refs<'a>(pat: &'a Pat<'a>) -> (&'a Pat<'a>, usize) {
+ fn peel<'a>(pat: &'a Pat<'a>, count: usize) -> (&'a Pat<'a>, usize) {
+ if let PatKind::Ref(pat, _) = pat.kind {
+ peel(pat, count + 1)
+ } else {
+ (pat, count)
+ }
+ }
+ peel(pat, 0)
+}
+
+/// Peels of expressions while the given closure returns `Some`.
+pub fn peel_hir_expr_while<'tcx>(
+ mut expr: &'tcx Expr<'tcx>,
+ mut f: impl FnMut(&'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>>,
+) -> &'tcx Expr<'tcx> {
+ while let Some(e) = f(expr) {
+ expr = e;
+ }
+ expr
+}
+
+/// Peels off up to the given number of references on the expression. Returns the underlying
+/// expression and the number of references removed.
+pub fn peel_n_hir_expr_refs<'a>(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>, usize) {
+ let mut remaining = count;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) if remaining != 0 => {
+ remaining -= 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count - remaining)
+}
+
+/// Peels off all references on the expression. Returns the underlying expression and the number of
+/// references removed.
+pub fn peel_hir_expr_refs<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
+ let mut count = 0;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) => {
+ count += 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count)
+}
+
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_hir_ty_refs<'a>(mut ty: &'a hir::Ty<'a>) -> (&'a hir::Ty<'a>, usize) {
+ let mut count = 0;
+ loop {
+ match &ty.kind {
+ TyKind::Rptr(_, ref_ty) => {
+ ty = ref_ty.ty;
+ count += 1;
+ },
+ _ => break (ty, count),
+ }
+ }
+}
+
+/// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is
+/// dereferenced. An overloaded deref such as `Vec` to slice would not be removed.
+pub fn peel_ref_operators<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -> &'hir Expr<'hir> {
+ loop {
+ match expr.kind {
+ ExprKind::AddrOf(_, _, e) => expr = e,
+ ExprKind::Unary(UnOp::Deref, e) if cx.typeck_results().expr_ty(e).is_ref() => expr = e,
+ _ => break,
+ }
+ }
+ expr
+}
+
+pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ if let Res::Def(_, def_id) = path.res {
+ return cx.tcx.has_attr(def_id, sym::cfg) || cx.tcx.has_attr(def_id, sym::cfg_attr);
+ }
+ }
+ false
+}
+
+static TEST_ITEM_NAMES_CACHE: OnceLock<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = OnceLock::new();
+
++fn with_test_item_names(tcx: TyCtxt<'_>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
+ let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));
+ let mut map: MutexGuard<'_, FxHashMap<LocalDefId, Vec<Symbol>>> = cache.lock().unwrap();
+ let value = map.entry(module);
+ match value {
+ Entry::Occupied(entry) => f(entry.get()),
+ Entry::Vacant(entry) => {
+ let mut names = Vec::new();
+ for id in tcx.hir().module_items(module) {
+ if matches!(tcx.def_kind(id.def_id), DefKind::Const)
+ && let item = tcx.hir().item(id)
+ && let ItemKind::Const(ty, _body) = item.kind {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ // We could also check for the type name `test::TestDescAndFn`
+ if let Res::Def(DefKind::Struct, _) = path.res {
+ let has_test_marker = tcx
+ .hir()
+ .attrs(item.hir_id())
+ .iter()
+ .any(|a| a.has_name(sym::rustc_test_marker));
+ if has_test_marker {
+ names.push(item.ident.name);
+ }
+ }
+ }
+ }
+ }
+ names.sort_unstable();
+ f(entry.insert(names))
+ },
+ }
+}
+
+/// Checks if the function containing the given `HirId` is a `#[test]` function
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
+pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ with_test_item_names(tcx, tcx.parent_module(id), |names| {
+ tcx.hir()
+ .parent_iter(id)
+ // Since you can nest functions we need to collect all until we leave
+ // function scope
+ .any(|(_id, node)| {
+ if let Node::Item(item) = node {
+ if let ItemKind::Fn(_, _, _) = item.kind {
+ // Note that we have sorted the item names in the visitor,
+ // so the binary_search gets the same as `contains`, but faster.
+ return names.binary_search(&item.ident.name).is_ok();
+ }
+ }
+ false
+ })
+ })
+}
+
+/// Checks if the item containing the given `HirId` has `#[cfg(test)]` attribute applied
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[cfg(test)]` function
+pub fn is_in_cfg_test(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ fn is_cfg_test(attr: &Attribute) -> bool {
+ if attr.has_name(sym::cfg)
+ && let Some(items) = attr.meta_item_list()
+ && let [item] = &*items
+ && item.has_name(sym::test)
+ {
+ true
+ } else {
+ false
+ }
+ }
+ tcx.hir()
+ .parent_iter(id)
+ .flat_map(|(parent_id, _)| tcx.hir().attrs(parent_id))
+ .any(is_cfg_test)
+}
+
+/// Checks whether item either has `test` attribute applied, or
+/// is a module with `test` in its name.
+///
+/// Note: Add `// compile-flags: --test` to UI tests with a `#[test]` function
+pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
+ is_in_test_function(tcx, item.hir_id())
+ || matches!(item.kind, ItemKind::Mod(..))
+ && item.ident.name.as_str().split('_').any(|a| a == "test" || a == "tests")
+}
+
+/// Walks the HIR tree from the given expression, up to the node where the value produced by the
+/// expression is consumed. Calls the function for every node encountered this way until it returns
+/// `Some`.
+///
+/// This allows walking through `if`, `match`, `break`, block expressions to find where the value
+/// produced by the expression is consumed.
+pub fn walk_to_expr_usage<'tcx, T>(
+ cx: &LateContext<'tcx>,
+ e: &Expr<'tcx>,
+ mut f: impl FnMut(Node<'tcx>, HirId) -> Option<T>,
+) -> Option<T> {
+ let map = cx.tcx.hir();
+ let mut iter = map.parent_iter(e.hir_id);
+ let mut child_id = e.hir_id;
+
+ while let Some((parent_id, parent)) = iter.next() {
+ if let Some(x) = f(parent, child_id) {
+ return Some(x);
+ }
+ let parent = match parent {
+ Node::Expr(e) => e,
+ Node::Block(Block { expr: Some(body), .. }) | Node::Arm(Arm { body, .. }) if body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ Node::Arm(a) if a.body.hir_id == child_id => {
+ child_id = parent_id;
+ continue;
+ },
+ _ => return None,
+ };
+ match parent.kind {
+ ExprKind::If(child, ..) | ExprKind::Match(child, ..) if child.hir_id != child_id => child_id = parent_id,
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _) => {
+ child_id = id;
+ iter = map.parent_iter(id);
+ },
+ ExprKind::Block(..) => child_id = parent_id,
+ _ => return None,
+ }
+ }
+ None
+}
+
+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
- channel = "nightly-2022-07-15"
+[toolchain]
++channel = "nightly-2022-07-28"
+components = ["cargo", "llvm-tools-preview", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
- "`{}` does not exists",
+#![feature(test)] // compiletest_rs requires this attribute
+#![feature(once_cell)]
+#![feature(is_sorted)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use compiletest_rs as compiletest;
+use compiletest_rs::common::Mode as TestMode;
+
+use std::collections::HashMap;
+use std::env::{self, remove_var, set_var, var_os};
+use std::ffi::{OsStr, OsString};
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+use std::sync::LazyLock;
+use test_utils::IS_RUSTC_TEST_SUITE;
+
+mod test_utils;
+
+// whether to run internal tests or not
+const RUN_INTERNAL_TESTS: bool = cfg!(feature = "internal");
+
+/// All crates used in UI tests are listed here
+static TEST_DEPENDENCIES: &[&str] = &[
+ "clippy_lints",
+ "clippy_utils",
+ "derive_new",
+ "futures",
+ "if_chain",
+ "itertools",
+ "quote",
+ "regex",
+ "serde",
+ "serde_derive",
+ "syn",
+ "tokio",
+ "parking_lot",
+ "rustc_semver",
+];
+
+// Test dependencies may need an `extern crate` here to ensure that they show up
+// in the depinfo file (otherwise cargo thinks they are unused)
+#[allow(unused_extern_crates)]
+extern crate clippy_lints;
+#[allow(unused_extern_crates)]
+extern crate clippy_utils;
+#[allow(unused_extern_crates)]
+extern crate derive_new;
+#[allow(unused_extern_crates)]
+extern crate futures;
+#[allow(unused_extern_crates)]
+extern crate if_chain;
+#[allow(unused_extern_crates)]
+extern crate itertools;
+#[allow(unused_extern_crates)]
+extern crate parking_lot;
+#[allow(unused_extern_crates)]
+extern crate quote;
+#[allow(unused_extern_crates)]
+extern crate rustc_semver;
+#[allow(unused_extern_crates)]
+extern crate syn;
+#[allow(unused_extern_crates)]
+extern crate tokio;
+
+/// Produces a string with an `--extern` flag for all UI test crate
+/// dependencies.
+///
+/// The dependency files are located by parsing the depinfo file for this test
+/// module. This assumes the `-Z binary-dep-depinfo` flag is enabled. All test
+/// dependencies must be added to Cargo.toml at the project root. Test
+/// dependencies that are not *directly* used by this test module require an
+/// `extern crate` declaration.
+static EXTERN_FLAGS: LazyLock<String> = LazyLock::new(|| {
+ let current_exe_depinfo = {
+ let mut path = env::current_exe().unwrap();
+ path.set_extension("d");
+ fs::read_to_string(path).unwrap()
+ };
+ let mut crates: HashMap<&str, &str> = HashMap::with_capacity(TEST_DEPENDENCIES.len());
+ for line in current_exe_depinfo.lines() {
+ // each dependency is expected to have a Makefile rule like `/path/to/crate-hash.rlib:`
+ let parse_name_path = || {
+ if line.starts_with(char::is_whitespace) {
+ return None;
+ }
+ let path_str = line.strip_suffix(':')?;
+ let path = Path::new(path_str);
+ if !matches!(path.extension()?.to_str()?, "rlib" | "so" | "dylib" | "dll") {
+ return None;
+ }
+ let (name, _hash) = path.file_stem()?.to_str()?.rsplit_once('-')?;
+ // the "lib" prefix is not present for dll files
+ let name = name.strip_prefix("lib").unwrap_or(name);
+ Some((name, path_str))
+ };
+ if let Some((name, path)) = parse_name_path() {
+ if TEST_DEPENDENCIES.contains(&name) {
+ // A dependency may be listed twice if it is available in sysroot,
+ // and the sysroot dependencies are listed first. As of the writing,
+ // this only seems to apply to if_chain.
+ crates.insert(name, path);
+ }
+ }
+ }
+ let not_found: Vec<&str> = TEST_DEPENDENCIES
+ .iter()
+ .copied()
+ .filter(|n| !crates.contains_key(n))
+ .collect();
+ assert!(
+ not_found.is_empty(),
+ "dependencies not found in depinfo: {:?}\n\
+ help: Make sure the `-Z binary-dep-depinfo` rust flag is enabled\n\
+ help: Try adding to dev-dependencies in Cargo.toml\n\
+ help: Be sure to also add `extern crate ...;` to tests/compile-test.rs",
+ not_found,
+ );
+ crates
+ .into_iter()
+ .map(|(name, path)| format!(" --extern {}={}", name, path))
+ .collect()
+});
+
+fn base_config(test_dir: &str) -> compiletest::Config {
+ let mut config = compiletest::Config {
+ edition: Some("2021".into()),
+ mode: TestMode::Ui,
+ ..Default::default()
+ };
+
+ if let Ok(filters) = env::var("TESTNAME") {
+ config.filters = filters.split(',').map(ToString::to_string).collect();
+ }
+
+ if let Some(path) = option_env!("RUSTC_LIB_PATH") {
+ let path = PathBuf::from(path);
+ config.run_lib_path = path.clone();
+ config.compile_lib_path = path;
+ }
+ let current_exe_path = env::current_exe().unwrap();
+ let deps_path = current_exe_path.parent().unwrap();
+ let profile_path = deps_path.parent().unwrap();
+
+ // Using `-L dependency={}` enforces that external dependencies are added with `--extern`.
+ // This is valuable because a) it allows us to monitor what external dependencies are used
+ // and b) it ensures that conflicting rlibs are resolved properly.
+ let host_libs = option_env!("HOST_LIBS")
+ .map(|p| format!(" -L dependency={}", Path::new(p).join("deps").display()))
+ .unwrap_or_default();
+ config.target_rustcflags = Some(format!(
+ "--emit=metadata -Dwarnings -Zui-testing -L dependency={}{}{}",
+ deps_path.display(),
+ host_libs,
+ &*EXTERN_FLAGS,
+ ));
+
+ config.src_base = Path::new("tests").join(test_dir);
+ config.build_base = profile_path.join("test").join(test_dir);
+ config.rustc_path = profile_path.join(if cfg!(windows) {
+ "clippy-driver.exe"
+ } else {
+ "clippy-driver"
+ });
+ config
+}
+
+fn run_ui() {
+ let mut config = base_config("ui");
+ config.rustfix_coverage = true;
+ // use tests/clippy.toml
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", fs::canonicalize("tests").unwrap());
+ let _threads = VarGuard::set(
+ "RUST_TEST_THREADS",
+ // if RUST_TEST_THREADS is set, adhere to it, otherwise override it
+ env::var("RUST_TEST_THREADS").unwrap_or_else(|_| {
+ std::thread::available_parallelism()
+ .map_or(1, std::num::NonZeroUsize::get)
+ .to_string()
+ }),
+ );
+ compiletest::run_tests(&config);
+ check_rustfix_coverage();
+}
+
+fn run_internal_tests() {
+ // only run internal tests with the internal-tests feature
+ if !RUN_INTERNAL_TESTS {
+ return;
+ }
+ let config = base_config("ui-internal");
+ compiletest::run_tests(&config);
+}
+
+fn run_ui_toml() {
+ fn run_tests(config: &compiletest::Config, mut tests: Vec<tester::TestDescAndFn>) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+ let dir_path = dir.path();
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", &dir_path);
+ for file in fs::read_dir(&dir_path)? {
+ let file = file?;
+ let file_path = file.path();
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+ if file_path.extension() != Some(OsStr::new("rs")) {
+ continue;
+ }
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: dir_path.file_name().unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ Ok(result)
+ }
+
+ let mut config = base_config("ui-toml");
+ config.src_base = config.src_base.canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(&config);
+
+ let res = run_tests(&config, tests);
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {:?}", e);
+ },
+ }
+}
+
+fn run_ui_cargo() {
+ fn run_tests(
+ config: &compiletest::Config,
+ filters: &[String],
+ mut tests: Vec<tester::TestDescAndFn>,
+ ) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Use the filter if provided
+ let dir_path = dir.path();
+ for filter in filters {
+ if !dir_path.ends_with(filter) {
+ continue;
+ }
+ }
+
+ for case in fs::read_dir(&dir_path)? {
+ let case = case?;
+ if !case.file_type()?.is_dir() {
+ continue;
+ }
+
+ let src_path = case.path().join("src");
+
+ // When switching between branches, if the previous branch had a test
+ // that the current branch does not have, the directory is not removed
+ // because an ignored Cargo.lock file exists.
+ if !src_path.exists() {
+ continue;
+ }
+
+ env::set_current_dir(&src_path)?;
+
+ let cargo_toml_path = case.path().join("Cargo.toml");
+ let cargo_content = fs::read(&cargo_toml_path)?;
+ let cargo_parsed: toml::Value = toml::from_str(
+ std::str::from_utf8(&cargo_content).expect("`Cargo.toml` is not a valid utf-8 file!"),
+ )
+ .expect("Can't parse `Cargo.toml`");
+
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", case.path());
+ let _h = VarGuard::set(
+ "CARGO_PKG_RUST_VERSION",
+ cargo_parsed
+ .get("package")
+ .and_then(|p| p.get("rust-version"))
+ .and_then(toml::Value::as_str)
+ .unwrap_or(""),
+ );
+
+ for file in fs::read_dir(&src_path)? {
+ let file = file?;
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Search for the main file to avoid running a test for each file in the project
+ let file_path = file.path();
+ match file_path.file_name().and_then(OsStr::to_str) {
+ Some("main.rs") => {},
+ _ => continue,
+ }
+ let _g = VarGuard::set("CLIPPY_CONF_DIR", case.path());
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: src_path.strip_prefix(&config.src_base).unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ }
+ Ok(result)
+ }
+
+ if IS_RUSTC_TEST_SUITE {
+ return;
+ }
+
+ let mut config = base_config("ui-cargo");
+ config.src_base = config.src_base.canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(&config);
+
+ let current_dir = env::current_dir().unwrap();
+ let res = run_tests(&config, &config.filters, tests);
+ env::set_current_dir(current_dir).unwrap();
+
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {:?}", e);
+ },
+ }
+}
+
+#[test]
+fn compile_test() {
+ set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
+ run_ui();
+ run_ui_toml();
+ run_ui_cargo();
+ run_internal_tests();
+}
+
+const RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS: &[&str] = &[
+ "assign_ops2.rs",
+ "borrow_deref_ref_unfixable.rs",
+ "cast_size_32bit.rs",
+ "char_lit_as_u8.rs",
+ "cmp_owned/without_suggestion.rs",
+ "dbg_macro.rs",
+ "deref_addrof_double_trigger.rs",
+ "doc/unbalanced_ticks.rs",
+ "eprint_with_newline.rs",
+ "explicit_counter_loop.rs",
+ "iter_skip_next_unfixable.rs",
+ "let_and_return.rs",
+ "literals.rs",
+ "map_flatten.rs",
+ "map_unwrap_or.rs",
+ "match_bool.rs",
+ "mem_replace_macro.rs",
+ "needless_arbitrary_self_type_unfixable.rs",
+ "needless_borrow_pat.rs",
+ "needless_for_each_unfixable.rs",
+ "nonminimal_bool.rs",
+ "print_literal.rs",
+ "print_with_newline.rs",
+ "redundant_static_lifetimes_multiple.rs",
+ "ref_binding_to_reference.rs",
+ "repl_uninit.rs",
+ "result_map_unit_fn_unfixable.rs",
+ "search_is_some.rs",
+ "single_component_path_imports_nested_first.rs",
+ "string_add.rs",
+ "toplevel_ref_arg_non_rustfix.rs",
+ "trait_duplication_in_bounds.rs",
+ "unit_arg.rs",
+ "unnecessary_clone.rs",
+ "unnecessary_lazy_eval_unfixable.rs",
+ "write_literal.rs",
+ "write_literal_2.rs",
+ "write_with_newline.rs",
+];
+
+fn check_rustfix_coverage() {
+ let missing_coverage_path = Path::new("target/debug/test/ui/rustfix_missing_coverage.txt");
+
+ if let Ok(missing_coverage_contents) = std::fs::read_to_string(missing_coverage_path) {
+ assert!(RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS.iter().is_sorted_by_key(Path::new));
+
+ for rs_path in missing_coverage_contents.lines() {
+ if Path::new(rs_path).starts_with("tests/ui/crashes") {
+ continue;
+ }
+ let filename = Path::new(rs_path).strip_prefix("tests/ui/").unwrap();
+ assert!(
+ RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS
+ .binary_search_by_key(&filename, Path::new)
+ .is_ok(),
+ "`{}` runs `MachineApplicable` diagnostics but is missing a `run-rustfix` annotation. \
+ Please either add `// run-rustfix` at the top of the file or add the file to \
+ `RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS` in `tests/compile-test.rs`.",
+ rs_path,
+ );
+ }
+ }
+}
+
+#[test]
+fn rustfix_coverage_known_exceptions_accuracy() {
+ for filename in RUSTFIX_COVERAGE_KNOWN_EXCEPTIONS {
+ let rs_path = Path::new("tests/ui").join(filename);
+ assert!(
+ rs_path.exists(),
++ "`{}` does not exist",
+ rs_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+ );
+ let fixed_path = rs_path.with_extension("fixed");
+ assert!(
+ !fixed_path.exists(),
+ "`{}` exists",
+ fixed_path.strip_prefix(env!("CARGO_MANIFEST_DIR")).unwrap().display()
+ );
+ }
+}
+
++#[test]
++fn ui_cargo_toml_metadata() {
++ let ui_cargo_path = Path::new("tests/ui-cargo");
++ let cargo_common_metadata_path = ui_cargo_path.join("cargo_common_metadata");
++ let publish_exceptions =
++ ["fail_publish", "fail_publish_true", "pass_publish_empty"].map(|path| cargo_common_metadata_path.join(path));
++
++ for entry in walkdir::WalkDir::new(ui_cargo_path) {
++ let entry = entry.unwrap();
++ let path = entry.path();
++ if path.file_name() != Some(OsStr::new("Cargo.toml")) {
++ continue;
++ }
++
++ let toml = fs::read_to_string(path).unwrap().parse::<toml::Value>().unwrap();
++
++ let package = toml.as_table().unwrap().get("package").unwrap().as_table().unwrap();
++
++ let name = package.get("name").unwrap().as_str().unwrap().replace('-', "_");
++ assert!(
++ path.parent()
++ .unwrap()
++ .components()
++ .map(|component| component.as_os_str().to_string_lossy().replace('-', "_"))
++ .any(|s| *s == name)
++ || path.starts_with(&cargo_common_metadata_path),
++ "{:?} has incorrect package name",
++ path
++ );
++
++ let publish = package.get("publish").and_then(toml::Value::as_bool).unwrap_or(true);
++ assert!(
++ !publish || publish_exceptions.contains(&path.parent().unwrap().to_path_buf()),
++ "{:?} lacks `publish = false`",
++ path
++ );
++ }
++}
++
+/// Restores an env var on drop
+#[must_use]
+struct VarGuard {
+ key: &'static str,
+ value: Option<OsString>,
+}
+
+impl VarGuard {
+ fn set(key: &'static str, val: impl AsRef<OsStr>) -> Self {
+ let value = var_os(key);
+ set_var(key, val);
+ Self { key, value }
+ }
+}
+
+impl Drop for VarGuard {
+ fn drop(&mut self) {
+ match self.value.as_deref() {
+ None => remove_var(self.key),
+ Some(value) => set_var(self.key, value),
+ }
+ }
+}
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_fail"
+version = "0.1.0"
+publish = false
+
+[workspace]
--- /dev/null
- error: package `cargo_common_metadata` is missing `package.description` metadata
++error: package `cargo_common_metadata_fail` is missing `package.description` metadata
+ |
+ = note: `-D clippy::cargo-common-metadata` implied by `-D warnings`
+
- error: package `cargo_common_metadata` is missing `either package.license or package.license_file` metadata
++error: package `cargo_common_metadata_fail` is missing `either package.license or package.license_file` metadata
+
- error: package `cargo_common_metadata` is missing `package.repository` metadata
++error: package `cargo_common_metadata_fail` is missing `package.repository` metadata
+
- error: package `cargo_common_metadata` is missing `package.readme` metadata
++error: package `cargo_common_metadata_fail` is missing `package.readme` metadata
+
- error: package `cargo_common_metadata` is missing `package.keywords` metadata
++error: package `cargo_common_metadata_fail` is missing `package.keywords` metadata
+
- error: package `cargo_common_metadata` is missing `package.categories` metadata
++error: package `cargo_common_metadata_fail` is missing `package.categories` metadata
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_fail_publish"
+version = "0.1.0"
+publish = ["some-registry-name"]
+
+[workspace]
--- /dev/null
- error: package `cargo_common_metadata` is missing `package.description` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `package.description` metadata
+ |
+ = note: `-D clippy::cargo-common-metadata` implied by `-D warnings`
+
- error: package `cargo_common_metadata` is missing `either package.license or package.license_file` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `either package.license or package.license_file` metadata
+
- error: package `cargo_common_metadata` is missing `package.repository` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `package.repository` metadata
+
- error: package `cargo_common_metadata` is missing `package.readme` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `package.readme` metadata
+
- error: package `cargo_common_metadata` is missing `package.keywords` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `package.keywords` metadata
+
- error: package `cargo_common_metadata` is missing `package.categories` metadata
++error: package `cargo_common_metadata_fail_publish` is missing `package.categories` metadata
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_fail_publish_true"
+version = "0.1.0"
+publish = true
+
+[workspace]
--- /dev/null
- error: package `cargo_common_metadata` is missing `package.description` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `package.description` metadata
+ |
+ = note: `-D clippy::cargo-common-metadata` implied by `-D warnings`
+
- error: package `cargo_common_metadata` is missing `either package.license or package.license_file` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `either package.license or package.license_file` metadata
+
- error: package `cargo_common_metadata` is missing `package.repository` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `package.repository` metadata
+
- error: package `cargo_common_metadata` is missing `package.readme` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `package.readme` metadata
+
- error: package `cargo_common_metadata` is missing `package.keywords` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `package.keywords` metadata
+
- error: package `cargo_common_metadata` is missing `package.categories` metadata
++error: package `cargo_common_metadata_fail_publish_true` is missing `package.categories` metadata
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_pass"
+version = "0.1.0"
+publish = false
+description = "A test package for the cargo_common_metadata lint"
+repository = "https://github.com/someone/cargo_common_metadata"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["metadata", "lint", "clippy"]
+categories = ["development-tools::testing"]
+
+[workspace]
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_pass_publish_empty"
+version = "0.1.0"
+publish = []
+
+[workspace]
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "cargo_common_metadata_pass_publish_false"
+version = "0.1.0"
+publish = false
+
+[workspace]
--- /dev/null
+[package]
+name = "fail-both-diff"
+version = "0.1.0"
+rust-version = "1.56"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "fail-both-same"
+version = "0.1.0"
+rust-version = "1.57.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "fail-cargo"
+version = "0.1.0"
+rust-version = "1.56.1"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "fail-clippy"
+version = "0.1.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "fail-file-attr"
+version = "0.1.0"
+rust-version = "1.13"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail-both-same"
+[package]
++name = "pass-both-same"
+version = "0.1.0"
+rust-version = "1.13.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail-cargo"
+[package]
++name = "pass-cargo"
+version = "0.1.0"
+rust-version = "1.13.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail-clippy"
+[package]
++name = "pass-clippy"
+version = "0.1.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail-file-attr"
+[package]
++name = "pass-file-attr"
+version = "0.1.0"
+rust-version = "1.59"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "warn-both-diff"
+version = "0.1.0"
+rust-version = "1.56.0"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail"
+[package]
++name = "fail-mod"
+version = "0.1.0"
+edition = "2018"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail"
+[package]
++name = "fail-no-mod"
+version = "0.1.0"
+edition = "2018"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "fail"
+[package]
++name = "pass-mod"
+version = "0.1.0"
+edition = "2018"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- name = "pass"
+[package]
++name = "pass-no-mod"
+version = "0.1.0"
+edition = "2018"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "no_warn"
+version = "0.1.0"
+edition = "2021"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
+[package]
+name = "warn"
+version = "0.1.0"
+edition = "2021"
++publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- /dev/null
- // ignore-windows
-
+fn main() {
+ println!("Hello, world!");
+}
--- /dev/null
- name = "cargo_common_metadata"
+[package]
++name = "multiple_crate_versions"
+version = "0.1.0"
+publish = false
+
+[workspace]
+
+[dependencies]
+regex = "1.3.7"
+serde = "1.0.110"
--- /dev/null
- = note: this error originates in the macro `$crate::declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+error: this item has an invalid `clippy::version` attribute
+ --> $DIR/check_clippy_version_attribute.rs:40:1
+ |
+LL | / declare_tool_lint! {
+LL | | #[clippy::version = "1.2.3.4.5.6"]
+LL | | pub clippy::INVALID_ONE,
+LL | | Warn,
+LL | | "One",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
+note: the lint level is defined here
+ --> $DIR/check_clippy_version_attribute.rs:1:9
+ |
+LL | #![deny(clippy::internal)]
+ | ^^^^^^^^^^^^^^^^
+ = note: `#[deny(clippy::invalid_clippy_version_attribute)]` implied by `#[deny(clippy::internal)]`
+ = help: please use a valid sematic version, see `doc/adding_lints.md`
- = note: this error originates in the macro `$crate::declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
++ = note: this error originates in the macro `$crate::declare_tool_lint` which comes from the expansion of the macro `declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: this item has an invalid `clippy::version` attribute
+ --> $DIR/check_clippy_version_attribute.rs:48:1
+ |
+LL | / declare_tool_lint! {
+LL | | #[clippy::version = "I'm a string"]
+LL | | pub clippy::INVALID_TWO,
+LL | | Warn,
+LL | | "Two",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
+ = help: please use a valid sematic version, see `doc/adding_lints.md`
- = note: this error originates in the macro `$crate::declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
++ = note: this error originates in the macro `$crate::declare_tool_lint` which comes from the expansion of the macro `declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: this lint is missing the `clippy::version` attribute or version value
+ --> $DIR/check_clippy_version_attribute.rs:59:1
+ |
+LL | / declare_tool_lint! {
+LL | | #[clippy::version]
+LL | | pub clippy::MISSING_ATTRIBUTE_ONE,
+LL | | Warn,
+LL | | "Two",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
+ = note: `#[deny(clippy::missing_clippy_version_attribute)]` implied by `#[deny(clippy::internal)]`
+ = help: please use a `clippy::version` attribute, see `doc/adding_lints.md`
- = note: this error originates in the macro `$crate::declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
++ = note: this error originates in the macro `$crate::declare_tool_lint` which comes from the expansion of the macro `declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: this lint is missing the `clippy::version` attribute or version value
+ --> $DIR/check_clippy_version_attribute.rs:67:1
+ |
+LL | / declare_tool_lint! {
+LL | | pub clippy::MISSING_ATTRIBUTE_TWO,
+LL | | Warn,
+LL | | "Two",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
+ = help: please use a `clippy::version` attribute, see `doc/adding_lints.md`
++ = note: this error originates in the macro `$crate::declare_tool_lint` which comes from the expansion of the macro `declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to 4 previous errors
+
--- /dev/null
- = note: this error originates in the macro `$crate::declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+error: the lint `TEST_LINT_DEFAULT` has the default lint description
+ --> $DIR/default_lint.rs:18:1
+ |
+LL | / declare_tool_lint! {
+LL | | pub clippy::TEST_LINT_DEFAULT,
+LL | | Warn,
+LL | | "default lint description",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
+note: the lint level is defined here
+ --> $DIR/default_lint.rs:1:9
+ |
+LL | #![deny(clippy::internal)]
+ | ^^^^^^^^^^^^^^^^
+ = note: `#[deny(clippy::default_lint)]` implied by `#[deny(clippy::internal)]`
++ = note: this error originates in the macro `$crate::declare_tool_lint` which comes from the expansion of the macro `declare_tool_lint` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+
--- /dev/null
- = note: this error originates in the macro `__if_chain` (in Nightly builds, run with -Z macro-backtrace for more info)
+error: this `if` can be part of the inner `if_chain!`
+ --> $DIR/if_chain_style.rs:9:5
+ |
+LL | / if true {
+LL | | let x = "";
+LL | | // `if_chain!` inside `if`
+LL | | if_chain! {
+... |
+LL | | }
+LL | | }
+ | |_____^
+ |
+ = note: `-D clippy::if-chain-style` implied by `-D warnings`
+help: this `let` statement can also be in the `if_chain!`
+ --> $DIR/if_chain_style.rs:10:9
+ |
+LL | let x = "";
+ | ^^^^^^^^^^^
+
+error: `if a && b;` should be `if a; if b;`
+ --> $DIR/if_chain_style.rs:19:12
+ |
+LL | if true
+ | ____________^
+LL | | // multi-line AND'ed conditions
+LL | | && false;
+ | |____________________^
+
+error: `let` expression should be inside `then { .. }`
+ --> $DIR/if_chain_style.rs:24:9
+ |
+LL | let x = "";
+ | ^^^^^^^^^^^
+
+error: this `if` can be part of the outer `if_chain!`
+ --> $DIR/if_chain_style.rs:35:13
+ |
+LL | if true {}
+ | ^^^^^^^^^^
+ |
+help: this `let` statement can also be in the `if_chain!`
+ --> $DIR/if_chain_style.rs:33:13
+ |
+LL | let x = "";
+ | ^^^^^^^^^^^
+
+error: `if_chain!` only has one `if`
+ --> $DIR/if_chain_style.rs:29:5
+ |
+LL | / if_chain! {
+LL | | // single `if` condition
+LL | | if true;
+LL | | then {
+... |
+LL | | }
+LL | | }
+ | |_____^
+ |
++ = note: this error originates in the macro `__if_chain` which comes from the expansion of the macro `if_chain` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: `let` expression should be above the `if_chain!`
+ --> $DIR/if_chain_style.rs:40:9
+ |
+LL | let x = "";
+ | ^^^^^^^^^^^
+
+error: this `if_chain!` can be merged with the outer `if_chain!`
+ --> $DIR/if_chain_style.rs:46:13
+ |
+LL | / if_chain! {
+LL | | if true;
+LL | | if true;
+LL | | then {}
+LL | | }
+ | |_____________^
+ |
+help: these `let` statements can also be in the `if_chain!`
+ --> $DIR/if_chain_style.rs:43:13
+ |
+LL | / let x = "";
+LL | | let x = "";
+ | |_______________________^
+
+error: aborting due to 7 previous errors
+
--- /dev/null
--- /dev/null
++#![warn(clippy::arithmetic)]
++
++use core::ops::Add;
++
++#[derive(Clone, Copy)]
++struct Point {
++ x: i32,
++ y: i32,
++}
++
++impl Add for Point {
++ type Output = Self;
++
++ fn add(self, other: Self) -> Self {
++ todo!()
++ }
++}
++
++fn main() {
++ let _ = Point { x: 1, y: 0 } + Point { x: 2, y: 3 };
++
++ let point: Point = Point { x: 1, y: 0 };
++ let _ = point + point;
++}
--- /dev/null
--- /dev/null
++arithmetic-allowed = ["Point"]
--- /dev/null
+error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown field `foobar`, expected one of
+ allow-dbg-in-tests
+ allow-expect-in-tests
+ allow-unwrap-in-tests
+ allowed-scripts
++ arithmetic-allowed
+ array-size-threshold
+ avoid-breaking-exported-api
+ await-holding-invalid-types
+ blacklisted-names
+ cargo-ignore-publish
+ cognitive-complexity-threshold
+ cyclomatic-complexity-threshold
+ disallowed-methods
+ disallowed-types
+ doc-valid-idents
+ enable-raw-pointer-heuristic-for-send
+ enforced-import-renames
+ enum-variant-name-threshold
+ enum-variant-size-threshold
+ literal-representation-threshold
+ max-fn-params-bools
+ max-include-file-size
+ max-struct-bools
+ max-suggested-slice-pattern-length
+ max-trait-bounds
+ msrv
+ pass-by-value-size-limit
+ single-char-binding-names-threshold
+ standard-macro-braces
+ third-party
+ too-large-for-stack
+ too-many-arguments-threshold
+ too-many-lines-threshold
+ trivial-copy-size-limit
+ type-complexity-threshold
+ unreadable-literal-lint-fractions
+ upper-case-acronyms-aggressive
+ vec-box-size-threshold
+ verbose-bit-mask-threshold
+ warn-on-all-wildcard-imports
+ at line 5 column 1
+
+error: aborting due to previous error
+
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![allow(clippy::unnecessary_owned_empty_strings)]
++#![feature(saturating_int_impl)]
++#![warn(clippy::arithmetic)]
++
++use core::num::{Saturating, Wrapping};
++
++pub fn hard_coded_allowed() {
++ 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;
++}
++
++fn main() {}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![allow(clippy::unnecessary_owned_empty_strings)]
++#![feature(saturating_int_impl)]
++#![warn(clippy::arithmetic)]
++
++use core::num::{Saturating, Wrapping};
++
++pub fn hard_coded_allowed() {
++ 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;
++}
++
++fn main() {}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::assertions_on_result_states)]
++
++use std::result::Result;
++
++struct Foo;
++
++#[derive(Debug)]
++struct DebugFoo;
++
++#[derive(Copy, Clone, Debug)]
++struct CopyFoo;
++
++macro_rules! get_ok_macro {
++ () => {
++ Ok::<_, DebugFoo>(Foo)
++ };
++}
++
++fn main() {
++ // test ok
++ let r: Result<Foo, DebugFoo> = Ok(Foo);
++ debug_assert!(r.is_ok());
++ r.unwrap();
++
++ // test ok with non-debug error type
++ let r: Result<Foo, Foo> = Ok(Foo);
++ assert!(r.is_ok());
++
++ // test temporary ok
++ fn get_ok() -> Result<Foo, DebugFoo> {
++ Ok(Foo)
++ }
++ get_ok().unwrap();
++
++ // test macro ok
++ get_ok_macro!().unwrap();
++
++ // test ok that shouldn't be moved
++ let r: Result<CopyFoo, DebugFoo> = Ok(CopyFoo);
++ fn test_ref_unmoveable_ok(r: &Result<CopyFoo, DebugFoo>) {
++ assert!(r.is_ok());
++ }
++ test_ref_unmoveable_ok(&r);
++ assert!(r.is_ok());
++ r.unwrap();
++
++ // test ok that is copied
++ let r: Result<CopyFoo, CopyFoo> = Ok(CopyFoo);
++ r.unwrap();
++ r.unwrap();
++
++ // test reference to ok
++ let r: Result<CopyFoo, CopyFoo> = Ok(CopyFoo);
++ fn test_ref_copy_ok(r: &Result<CopyFoo, CopyFoo>) {
++ r.unwrap();
++ }
++ test_ref_copy_ok(&r);
++ r.unwrap();
++
++ // test err
++ let r: Result<DebugFoo, Foo> = Err(Foo);
++ debug_assert!(r.is_err());
++ r.unwrap_err();
++
++ // test err with non-debug value type
++ let r: Result<Foo, Foo> = Err(Foo);
++ assert!(r.is_err());
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::assertions_on_result_states)]
++
++use std::result::Result;
++
++struct Foo;
++
++#[derive(Debug)]
++struct DebugFoo;
++
++#[derive(Copy, Clone, Debug)]
++struct CopyFoo;
++
++macro_rules! get_ok_macro {
++ () => {
++ Ok::<_, DebugFoo>(Foo)
++ };
++}
++
++fn main() {
++ // test ok
++ let r: Result<Foo, DebugFoo> = Ok(Foo);
++ debug_assert!(r.is_ok());
++ assert!(r.is_ok());
++
++ // test ok with non-debug error type
++ let r: Result<Foo, Foo> = Ok(Foo);
++ assert!(r.is_ok());
++
++ // test temporary ok
++ fn get_ok() -> Result<Foo, DebugFoo> {
++ Ok(Foo)
++ }
++ assert!(get_ok().is_ok());
++
++ // test macro ok
++ assert!(get_ok_macro!().is_ok());
++
++ // test ok that shouldn't be moved
++ let r: Result<CopyFoo, DebugFoo> = Ok(CopyFoo);
++ fn test_ref_unmoveable_ok(r: &Result<CopyFoo, DebugFoo>) {
++ assert!(r.is_ok());
++ }
++ test_ref_unmoveable_ok(&r);
++ assert!(r.is_ok());
++ r.unwrap();
++
++ // test ok that is copied
++ let r: Result<CopyFoo, CopyFoo> = Ok(CopyFoo);
++ assert!(r.is_ok());
++ r.unwrap();
++
++ // test reference to ok
++ let r: Result<CopyFoo, CopyFoo> = Ok(CopyFoo);
++ fn test_ref_copy_ok(r: &Result<CopyFoo, CopyFoo>) {
++ assert!(r.is_ok());
++ }
++ test_ref_copy_ok(&r);
++ r.unwrap();
++
++ // test err
++ let r: Result<DebugFoo, Foo> = Err(Foo);
++ debug_assert!(r.is_err());
++ assert!(r.is_err());
++
++ // test err with non-debug value type
++ let r: Result<Foo, Foo> = Err(Foo);
++ assert!(r.is_err());
++}
--- /dev/null
--- /dev/null
++error: called `assert!` with `Result::is_ok`
++ --> $DIR/assertions_on_result_states.rs:24:5
++ |
++LL | assert!(r.is_ok());
++ | ^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap()`
++ |
++ = note: `-D clippy::assertions-on-result-states` implied by `-D warnings`
++
++error: called `assert!` with `Result::is_ok`
++ --> $DIR/assertions_on_result_states.rs:34:5
++ |
++LL | assert!(get_ok().is_ok());
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `get_ok().unwrap()`
++
++error: called `assert!` with `Result::is_ok`
++ --> $DIR/assertions_on_result_states.rs:37:5
++ |
++LL | assert!(get_ok_macro!().is_ok());
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `get_ok_macro!().unwrap()`
++
++error: called `assert!` with `Result::is_ok`
++ --> $DIR/assertions_on_result_states.rs:50:5
++ |
++LL | assert!(r.is_ok());
++ | ^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap()`
++
++error: called `assert!` with `Result::is_ok`
++ --> $DIR/assertions_on_result_states.rs:56:9
++ |
++LL | assert!(r.is_ok());
++ | ^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap()`
++
++error: called `assert!` with `Result::is_err`
++ --> $DIR/assertions_on_result_states.rs:64:5
++ |
++LL | assert!(r.is_err());
++ | ^^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap_err()`
++
++error: aborting due to 6 previous errors
++
--- /dev/null
+// run-rustfix
+
++use core::num::Wrapping;
++
+#[allow(dead_code, unused_assignments)]
+#[warn(clippy::assign_op_pattern)]
+fn main() {
+ let mut a = 5;
+ a += 1;
+ a += 1;
+ a -= 1;
+ a *= 99;
+ a *= 42;
+ a /= 2;
+ a %= 5;
+ a &= 1;
+ a = 1 - a;
+ a = 5 / a;
+ a = 42 % a;
+ a = 6 << a;
+ let mut s = String::new();
+ s += "bla";
++
++ // Issue #9180
++ let mut a = Wrapping(0u32);
++ a += Wrapping(1u32);
++ let mut v = vec![0u32, 1u32];
++ v[0] += v[1];
++ let mut v = vec![Wrapping(0u32), Wrapping(1u32)];
++ v[0] = v[0] + v[1];
++ let _ = || v[0] = v[0] + v[1];
+}
--- /dev/null
+// run-rustfix
+
++use core::num::Wrapping;
++
+#[allow(dead_code, unused_assignments)]
+#[warn(clippy::assign_op_pattern)]
+fn main() {
+ let mut a = 5;
+ a = a + 1;
+ a = 1 + a;
+ a = a - 1;
+ a = a * 99;
+ a = 42 * a;
+ a = a / 2;
+ a = a % 5;
+ a = a & 1;
+ a = 1 - a;
+ a = 5 / a;
+ a = 42 % a;
+ a = 6 << a;
+ let mut s = String::new();
+ s = s + "bla";
++
++ // Issue #9180
++ let mut a = Wrapping(0u32);
++ a = a + Wrapping(1u32);
++ let mut v = vec![0u32, 1u32];
++ v[0] = v[0] + v[1];
++ let mut v = vec![Wrapping(0u32), Wrapping(1u32)];
++ v[0] = v[0] + v[1];
++ let _ = || v[0] = v[0] + v[1];
+}
--- /dev/null
- --> $DIR/assign_ops.rs:7:5
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:8:5
++ --> $DIR/assign_ops.rs:9:5
+ |
+LL | a = a + 1;
+ | ^^^^^^^^^ help: replace it with: `a += 1`
+ |
+ = note: `-D clippy::assign-op-pattern` implied by `-D warnings`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:9:5
++ --> $DIR/assign_ops.rs:10:5
+ |
+LL | a = 1 + a;
+ | ^^^^^^^^^ help: replace it with: `a += 1`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:10:5
++ --> $DIR/assign_ops.rs:11:5
+ |
+LL | a = a - 1;
+ | ^^^^^^^^^ help: replace it with: `a -= 1`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:11:5
++ --> $DIR/assign_ops.rs:12:5
+ |
+LL | a = a * 99;
+ | ^^^^^^^^^^ help: replace it with: `a *= 99`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:12:5
++ --> $DIR/assign_ops.rs:13:5
+ |
+LL | a = 42 * a;
+ | ^^^^^^^^^^ help: replace it with: `a *= 42`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:13:5
++ --> $DIR/assign_ops.rs:14:5
+ |
+LL | a = a / 2;
+ | ^^^^^^^^^ help: replace it with: `a /= 2`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:14:5
++ --> $DIR/assign_ops.rs:15:5
+ |
+LL | a = a % 5;
+ | ^^^^^^^^^ help: replace it with: `a %= 5`
+
+error: manual implementation of an assign operation
- --> $DIR/assign_ops.rs:20:5
++ --> $DIR/assign_ops.rs:16:5
+ |
+LL | a = a & 1;
+ | ^^^^^^^^^ help: replace it with: `a &= 1`
+
+error: manual implementation of an assign operation
- error: aborting due to 9 previous errors
++ --> $DIR/assign_ops.rs:22:5
+ |
+LL | s = s + "bla";
+ | ^^^^^^^^^^^^^ help: replace it with: `s += "bla"`
+
++error: manual implementation of an assign operation
++ --> $DIR/assign_ops.rs:26:5
++ |
++LL | a = a + Wrapping(1u32);
++ | ^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `a += Wrapping(1u32)`
++
++error: manual implementation of an assign operation
++ --> $DIR/assign_ops.rs:28:5
++ |
++LL | v[0] = v[0] + v[1];
++ | ^^^^^^^^^^^^^^^^^^ help: replace it with: `v[0] += v[1]`
++
++error: aborting due to 11 previous errors
+
--- /dev/null
--- /dev/null
++#![allow(incomplete_features)]
++#![feature(generic_const_exprs)]
++#![warn(clippy::branches_sharing_code)]
++
++const fn f() -> usize {
++ 2
++}
++const C: [f64; f()] = [0f64; f()];
++
++fn main() {
++ let _ = if true { C[0] } else { C[1] };
++}
--- /dev/null
--- /dev/null
++enum E {
++ X(),
++ Y,
++}
++
++fn main() {
++ let _ = if let E::X() = E::X() { 1 } else { 2 };
++}
--- /dev/null
- // ignore-windows
+// ignore-macos
+
+#![feature(rustc_attrs)]
+
+#[warn(clippy::main_recursion)]
+#[allow(unconditional_recursion)]
+#[rustc_main]
+fn a() {
+ println!("Hello, World!");
+ a();
+}
--- /dev/null
- --> $DIR/entrypoint_recursion.rs:11:5
+error: recursing into entrypoint `a`
++ --> $DIR/entrypoint_recursion.rs:10:5
+ |
+LL | a();
+ | ^
+ |
+ = note: `-D clippy::main-recursion` implied by `-D warnings`
+ = help: consider using another function for this recursion
+
+error: aborting due to previous error
+
--- /dev/null
- // issue #8493
- thread_local! {
- static THREAD_LOCAL: Cell<i32> = const { Cell::new(0) };
+#![warn(clippy::declare_interior_mutable_const)]
+
+use std::borrow::Cow;
+use std::cell::Cell;
+use std::fmt::Display;
+use std::sync::atomic::AtomicUsize;
+use std::sync::Once;
+
+const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR interior mutable
+const CELL: Cell<usize> = Cell::new(6); //~ ERROR interior mutable
+const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
+//~^ ERROR interior mutable
+
+macro_rules! declare_const {
+ ($name:ident: $ty:ty = $e:expr) => {
+ const $name: $ty = $e;
+ };
+}
+declare_const!(_ONCE: Once = Once::new()); //~ ERROR interior mutable
+
+// const ATOMIC_REF: &AtomicUsize = &AtomicUsize::new(7); // This will simply trigger E0492.
+
+const INTEGER: u8 = 8;
+const STRING: String = String::new();
+const STR: &str = "012345";
+const COW: Cow<str> = Cow::Borrowed("abcdef");
+//^ note: a const item of Cow is used in the `postgres` package.
+
+const NO_ANN: &dyn Display = &70;
+
+static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
+//^ there should be no lints on this line
+
++mod issue_8493 {
++ use std::cell::Cell;
++
++ thread_local! {
++ static _BAR: Cell<i32> = const { Cell::new(0) };
++ }
++
++ macro_rules! issue_8493 {
++ () => {
++ const _BAZ: Cell<usize> = Cell::new(0); //~ ERROR interior mutable
++ static _FOOBAR: () = {
++ thread_local! {
++ static _VAR: Cell<i32> = const { Cell::new(0) };
++ }
++ };
++ };
++ }
++
++ issue_8493!();
+}
+
+fn main() {}
--- /dev/null
- error: aborting due to 4 previous errors
+error: a `const` item should never be interior mutable
+ --> $DIR/others.rs:9:1
+ |
+LL | const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR interior mutable
+ | -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ | |
+ | make this a static item (maybe with lazy_static)
+ |
+ = note: `-D clippy::declare-interior-mutable-const` implied by `-D warnings`
+
+error: a `const` item should never be interior mutable
+ --> $DIR/others.rs:10:1
+ |
+LL | const CELL: Cell<usize> = Cell::new(6); //~ ERROR interior mutable
+ | -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ | |
+ | make this a static item (maybe with lazy_static)
+
+error: a `const` item should never be interior mutable
+ --> $DIR/others.rs:11:1
+ |
+LL | const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
+ | -----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ | |
+ | make this a static item (maybe with lazy_static)
+
+error: a `const` item should never be interior mutable
+ --> $DIR/others.rs:16:9
+ |
+LL | const $name: $ty = $e;
+ | ^^^^^^^^^^^^^^^^^^^^^^
+...
+LL | declare_const!(_ONCE: Once = Once::new()); //~ ERROR interior mutable
+ | ----------------------------------------- in this macro invocation
+ |
+ = note: this error originates in the macro `declare_const` (in Nightly builds, run with -Z macro-backtrace for more info)
+
++error: a `const` item should never be interior mutable
++ --> $DIR/others.rs:43:13
++ |
++LL | const _BAZ: Cell<usize> = Cell::new(0); //~ ERROR interior mutable
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++...
++LL | issue_8493!();
++ | ------------- in this macro invocation
++ |
++ = note: this error originates in the macro `issue_8493` (in Nightly builds, run with -Z macro-backtrace for more info)
++
++error: aborting due to 5 previous errors
+
--- /dev/null
+// run-rustfix
+
+#![allow(
+ clippy::print_literal,
+ clippy::redundant_clone,
+ clippy::to_string_in_format_args,
+ clippy::needless_borrow
+)]
+#![warn(clippy::useless_format)]
+
+struct Foo(pub String);
+
+macro_rules! foo {
+ ($($t:tt)*) => (Foo(format!($($t)*)))
+}
+
+fn main() {
+ "foo".to_string();
+ "{}".to_string();
+ "{} abc {}".to_string();
+ r##"foo {}
+" bar"##.to_string();
+
+ let _ = String::new();
+
+ "foo".to_string();
+ format!("{:?}", "foo"); // Don't warn about `Debug`.
+ format!("{:8}", "foo");
+ format!("{:width$}", "foo", width = 8);
+ "foo".to_string(); // Warn when the format makes no difference.
+ "foo".to_string(); // Warn when the format makes no difference.
+ format!("foo {}", "bar");
+ format!("{} bar", "foo");
+
+ let arg: String = "".to_owned();
+ arg.to_string();
+ format!("{:?}", arg); // Don't warn about debug.
+ format!("{:8}", arg);
+ format!("{:width$}", arg, width = 8);
+ arg.to_string(); // Warn when the format makes no difference.
+ arg.to_string(); // Warn when the format makes no difference.
+ format!("foo {}", arg);
+ format!("{} bar", arg);
+
+ // We don’t want to warn for non-string args; see issue #697.
+ format!("{}", 42);
+ format!("{:?}", 42);
+ format!("{:+}", 42);
+ format!("foo {}", 42);
+ format!("{} bar", 42);
+
+ // We only want to warn about `format!` itself.
+ println!("foo");
+ println!("{}", "foo");
+ println!("foo {}", "foo");
+ println!("{}", 42);
+ println!("foo {}", 42);
+
+ // A `format!` inside a macro should not trigger a warning.
+ foo!("should not warn");
+
+ // Precision on string means slicing without panicking on size.
+ format!("{:.1}", "foo"); // Could be `"foo"[..1]`
+ format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
+ format!("{:.prec$}", "foo", prec = 1);
+ format!("{:.prec$}", "foo", prec = 10);
+
+ 42.to_string();
+ let x = std::path::PathBuf::from("/bar/foo/qux");
+ x.display().to_string();
+
+ // False positive
+ let a = "foo".to_string();
+ let _ = Some(a + "bar");
+
+ // Wrap it with braces
+ let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
+ let _s: String = (&*v.join("\n")).to_string();
+
+ format!("prepend {:+}", "s");
+
+ // Issue #8290
+ let x = "foo";
+ let _ = x.to_string();
+ let _ = format!("{x:?}"); // Don't lint on debug
+ let _ = x.to_string();
++
++ // Issue #9234
++ let abc = "abc";
++ let _ = abc.to_string();
++ let xx = "xx";
++ let _ = xx.to_string();
+}
--- /dev/null
+// run-rustfix
+
+#![allow(
+ clippy::print_literal,
+ clippy::redundant_clone,
+ clippy::to_string_in_format_args,
+ clippy::needless_borrow
+)]
+#![warn(clippy::useless_format)]
+
+struct Foo(pub String);
+
+macro_rules! foo {
+ ($($t:tt)*) => (Foo(format!($($t)*)))
+}
+
+fn main() {
+ format!("foo");
+ format!("{{}}");
+ format!("{{}} abc {{}}");
+ format!(
+ r##"foo {{}}
+" bar"##
+ );
+
+ let _ = format!("");
+
+ format!("{}", "foo");
+ format!("{:?}", "foo"); // Don't warn about `Debug`.
+ format!("{:8}", "foo");
+ format!("{:width$}", "foo", width = 8);
+ format!("{:+}", "foo"); // Warn when the format makes no difference.
+ format!("{:<}", "foo"); // Warn when the format makes no difference.
+ format!("foo {}", "bar");
+ format!("{} bar", "foo");
+
+ let arg: String = "".to_owned();
+ format!("{}", arg);
+ format!("{:?}", arg); // Don't warn about debug.
+ format!("{:8}", arg);
+ format!("{:width$}", arg, width = 8);
+ format!("{:+}", arg); // Warn when the format makes no difference.
+ format!("{:<}", arg); // Warn when the format makes no difference.
+ format!("foo {}", arg);
+ format!("{} bar", arg);
+
+ // We don’t want to warn for non-string args; see issue #697.
+ format!("{}", 42);
+ format!("{:?}", 42);
+ format!("{:+}", 42);
+ format!("foo {}", 42);
+ format!("{} bar", 42);
+
+ // We only want to warn about `format!` itself.
+ println!("foo");
+ println!("{}", "foo");
+ println!("foo {}", "foo");
+ println!("{}", 42);
+ println!("foo {}", 42);
+
+ // A `format!` inside a macro should not trigger a warning.
+ foo!("should not warn");
+
+ // Precision on string means slicing without panicking on size.
+ format!("{:.1}", "foo"); // Could be `"foo"[..1]`
+ format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
+ format!("{:.prec$}", "foo", prec = 1);
+ format!("{:.prec$}", "foo", prec = 10);
+
+ format!("{}", 42.to_string());
+ let x = std::path::PathBuf::from("/bar/foo/qux");
+ format!("{}", x.display().to_string());
+
+ // False positive
+ let a = "foo".to_string();
+ let _ = Some(format!("{}", a + "bar"));
+
+ // Wrap it with braces
+ let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
+ let _s: String = format!("{}", &*v.join("\n"));
+
+ format!("prepend {:+}", "s");
+
+ // Issue #8290
+ let x = "foo";
+ let _ = format!("{x}");
+ let _ = format!("{x:?}"); // Don't lint on debug
+ let _ = format!("{y}", y = x);
++
++ // Issue #9234
++ let abc = "abc";
++ let _ = format!("{abc}");
++ let xx = "xx";
++ let _ = format!("{xx}");
+}
--- /dev/null
- error: aborting due to 17 previous errors
+error: useless use of `format!`
+ --> $DIR/format.rs:18:5
+ |
+LL | format!("foo");
+ | ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+ |
+ = note: `-D clippy::useless-format` implied by `-D warnings`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:19:5
+ |
+LL | format!("{{}}");
+ | ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{}".to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:20:5
+ |
+LL | format!("{{}} abc {{}}");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{} abc {}".to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:21:5
+ |
+LL | / format!(
+LL | | r##"foo {{}}
+LL | | " bar"##
+LL | | );
+ | |_____^
+ |
+help: consider using `.to_string()`
+ |
+LL ~ r##"foo {}
+LL ~ " bar"##.to_string();
+ |
+
+error: useless use of `format!`
+ --> $DIR/format.rs:26:13
+ |
+LL | let _ = format!("");
+ | ^^^^^^^^^^^ help: consider using `String::new()`: `String::new()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:28:5
+ |
+LL | format!("{}", "foo");
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:32:5
+ |
+LL | format!("{:+}", "foo"); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:33:5
+ |
+LL | format!("{:<}", "foo"); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:38:5
+ |
+LL | format!("{}", arg);
+ | ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:42:5
+ |
+LL | format!("{:+}", arg); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:43:5
+ |
+LL | format!("{:<}", arg); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:70:5
+ |
+LL | format!("{}", 42.to_string());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `42.to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:72:5
+ |
+LL | format!("{}", x.display().to_string());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.display().to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:76:18
+ |
+LL | let _ = Some(format!("{}", a + "bar"));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:80:22
+ |
+LL | let _s: String = format!("{}", &*v.join("/n"));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `(&*v.join("/n")).to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:86:13
+ |
+LL | let _ = format!("{x}");
+ | ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
+
+error: useless use of `format!`
+ --> $DIR/format.rs:88:13
+ |
+LL | let _ = format!("{y}", y = x);
+ | ^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
+
++error: useless use of `format!`
++ --> $DIR/format.rs:92:13
++ |
++LL | let _ = format!("{abc}");
++ | ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `abc.to_string()`
++
++error: useless use of `format!`
++ --> $DIR/format.rs:94:13
++ |
++LL | let _ = format!("{xx}");
++ | ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `xx.to_string()`
++
++error: aborting due to 19 previous errors
+
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+#![warn(clippy::match_same_arms)]
++#![allow(clippy::blacklisted_name, clippy::diverging_sub_expression)]
+
+fn bar<T>(_: T) {}
+fn foo() -> bool {
+ unimplemented!()
+}
+
+fn match_same_arms() {
+ let _ = match 42 {
+ 42 => {
+ foo();
+ let mut a = 42 + [23].len() as i32;
+ if true {
+ a += 7;
+ }
+ a = -31 - a;
+ a
+ },
+ _ => {
+ //~ ERROR match arms have same body
+ foo();
+ let mut a = 42 + [23].len() as i32;
+ if true {
+ a += 7;
+ }
+ a = -31 - a;
+ a
+ },
+ };
+
+ let _ = match 42 {
+ 42 => foo(),
+ 51 => foo(), //~ ERROR match arms have same body
+ _ => true,
+ };
+
+ let _ = match Some(42) {
+ Some(_) => 24,
+ None => 24, //~ ERROR match arms have same body
+ };
+
+ let _ = match Some(42) {
+ Some(foo) => 24,
+ None => 24,
+ };
+
+ let _ = match Some(42) {
+ Some(42) => 24,
+ Some(a) => 24, // bindings are different
+ None => 0,
+ };
+
+ let _ = match Some(42) {
+ Some(a) if a > 0 => 24,
+ Some(a) => 24, // one arm has a guard
+ None => 0,
+ };
+
+ match (Some(42), Some(42)) {
+ (Some(a), None) => bar(a),
+ (None, Some(a)) => bar(a), //~ ERROR match arms have same body
+ _ => (),
+ }
+
+ match (Some(42), Some(42)) {
+ (Some(a), ..) => bar(a),
+ (.., Some(a)) => bar(a), //~ ERROR match arms have same body
+ _ => (),
+ }
+
+ let _ = match Some(()) {
+ Some(()) => 0.0,
+ None => -0.0,
+ };
+
+ match (Some(42), Some("")) {
+ (Some(a), None) => bar(a),
+ (None, Some(a)) => bar(a), // bindings have different types
+ _ => (),
+ }
+
+ let x: Result<i32, &str> = Ok(3);
+
+ // No warning because of the guard.
+ match x {
+ Ok(x) if x * x == 64 => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => println!("err"),
+ }
+
+ // This used to be a false positive; see issue #1996.
+ match x {
+ Ok(3) => println!("ok"),
+ Ok(x) if x * x == 64 => println!("ok 64"),
+ Ok(_) => println!("ok"),
+ Err(_) => println!("err"),
+ }
+
+ match (x, Some(1i32)) {
+ (Ok(x), Some(_)) => println!("ok {}", x),
+ (Ok(_), Some(x)) => println!("ok {}", x),
+ _ => println!("err"),
+ }
+
+ // No warning; different types for `x`.
+ match (x, Some(1.0f64)) {
+ (Ok(x), Some(_)) => println!("ok {}", x),
+ (Ok(_), Some(x)) => println!("ok {}", x),
+ _ => println!("err"),
+ }
+
+ // False negative #2251.
+ match x {
+ Ok(_tmp) => println!("ok"),
+ Ok(3) => println!("ok"),
+ Ok(_) => println!("ok"),
+ Err(_) => {
+ unreachable!();
+ },
+ }
+
+ // False positive #1390
+ macro_rules! empty {
+ ($e:expr) => {};
+ }
+ match 0 {
+ 0 => {
+ empty!(0);
+ },
+ 1 => {
+ empty!(1);
+ },
+ x => {
+ empty!(x);
+ },
+ };
+
+ // still lint if the tokens are the same
+ match 0 {
+ 0 => {
+ empty!(0);
+ },
+ 1 => {
+ empty!(0);
+ },
+ x => {
+ empty!(x);
+ },
+ }
+
+ match_expr_like_matches_macro_priority();
+}
+
+fn match_expr_like_matches_macro_priority() {
+ enum E {
+ A,
+ B,
+ C,
+ }
+ let x = E::A;
+ let _ans = match x {
+ E::A => false,
+ E::B => false,
+ _ => true,
+ };
+}
+
+fn main() {
+ let _ = match Some(0) {
+ Some(0) => 0,
+ Some(1) => 1,
+ #[cfg(feature = "foo")]
+ Some(2) => 2,
+ _ => 1,
+ };
+
+ enum Foo {
+ X(u32),
+ Y(u32),
+ Z(u32),
+ }
+
+ // Don't lint. `Foo::X(0)` and `Foo::Z(_)` overlap with the arm in between.
+ let _ = match Foo::X(0) {
+ Foo::X(0) => 1,
+ Foo::X(_) | Foo::Y(_) | Foo::Z(0) => 2,
+ Foo::Z(_) => 1,
+ _ => 0,
+ };
+
+ // Suggest moving `Foo::Z(_)` up.
+ let _ = match Foo::X(0) {
+ Foo::X(0) => 1,
+ Foo::X(_) | Foo::Y(_) => 2,
+ Foo::Z(_) => 1,
+ _ => 0,
+ };
+
+ // Suggest moving `Foo::X(0)` down.
+ let _ = match Foo::X(0) {
+ Foo::X(0) => 1,
+ Foo::Y(_) | Foo::Z(0) => 2,
+ Foo::Z(_) => 1,
+ _ => 0,
+ };
+
+ // Don't lint.
+ let _ = match 0 {
+ -2 => 1,
+ -5..=50 => 2,
+ -150..=88 => 1,
+ _ => 3,
+ };
+
+ struct Bar {
+ x: u32,
+ y: u32,
+ z: u32,
+ }
+
+ // Lint.
+ let _ = match None {
+ Some(Bar { x: 0, y: 5, .. }) => 1,
+ Some(Bar { y: 10, z: 0, .. }) => 2,
+ None => 50,
+ Some(Bar { y: 0, x: 5, .. }) => 1,
+ _ => 200,
+ };
++
++ let _ = match 0 {
++ 0 => todo!(),
++ 1 => todo!(),
++ 2 => core::convert::identity::<u32>(todo!()),
++ 3 => core::convert::identity::<u32>(todo!()),
++ _ => 5,
++ };
+}
--- /dev/null
+#![warn(clippy::mismatching_type_param_order)]
+#![allow(clippy::blacklisted_name)]
+
+fn main() {
+ struct Foo<A, B> {
+ x: A,
+ y: B,
+ }
+
+ // lint on both params
+ impl<B, A> Foo<B, A> {}
+
+ // lint on the 2nd param
+ impl<C, A> Foo<C, A> {}
+
+ // should not lint
+ impl<A, B> Foo<A, B> {}
+
+ struct FooLifetime<'l, 'm, A, B> {
+ x: &'l A,
+ y: &'m B,
+ }
+
+ // should not lint on lifetimes
+ impl<'m, 'l, B, A> FooLifetime<'m, 'l, B, A> {}
+
+ struct Bar {
+ x: i32,
+ }
+
+ // should not lint
+ impl Bar {}
+
+ // also works for enums
+ enum FooEnum<A, B, C> {
+ X(A),
+ Y(B),
+ Z(C),
+ }
+
+ impl<C, A, B> FooEnum<C, A, B> {}
+
+ // also works for unions
+ union FooUnion<A: Copy, B>
+ where
+ B: Copy,
+ {
+ x: A,
+ y: B,
+ }
+
+ impl<B: Copy, A> FooUnion<B, A> where A: Copy {}
+
+ impl<A, B> FooUnion<A, B>
+ where
+ A: Copy,
+ B: Copy,
+ {
+ }
++
++ // if the types are complicated, do not lint
++ impl<K, V, B> Foo<(K, V), B> {}
++ impl<K, V, A> Foo<(K, V), A> {}
+}
--- /dev/null
+// run-rustfix
+
+#![feature(lint_reasons)]
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables, clippy::unnecessary_mut_passed)]
+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
+ }
+ }
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+#[allow(dead_code)]
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
++
++#[allow(dead_code)]
++mod issue9160 {
++ pub struct S<F> {
++ f: F,
++ }
++
++ impl<T, F> S<F>
++ where
++ F: Fn() -> T,
++ {
++ fn calls_field(&self) -> T {
++ (self.f)()
++ }
++ }
++
++ impl<T, F> S<F>
++ where
++ F: FnMut() -> T,
++ {
++ fn calls_mut_field(&mut self) -> T {
++ (self.f)()
++ }
++ }
++}
--- /dev/null
+// run-rustfix
+
+#![feature(lint_reasons)]
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables, clippy::unnecessary_mut_passed)]
+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
+ }
+ }
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
+
+#[allow(dead_code)]
+fn check_expect_suppression() {
+ let a = 5;
+ #[expect(clippy::needless_borrow)]
+ let _ = x(&&a);
+}
++
++#[allow(dead_code)]
++mod issue9160 {
++ pub struct S<F> {
++ f: F,
++ }
++
++ impl<T, F> S<F>
++ where
++ F: Fn() -> T,
++ {
++ fn calls_field(&self) -> T {
++ (&self.f)()
++ }
++ }
++
++ impl<T, F> S<F>
++ where
++ F: FnMut() -> T,
++ {
++ fn calls_mut_field(&mut self) -> T {
++ (&mut self.f)()
++ }
++ }
++}
--- /dev/null
- error: aborting due to 20 previous errors
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:11:15
+ |
+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:15:13
+ |
+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:27:13
+ |
+LL | &&a
+ | ^^^ help: change this to: `&a`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:29:15
+ |
+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:35:27
+ |
+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:42:15
+ |
+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:43:15
+ |
+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:44:15
+ |
+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:45:15
+ |
+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:48:11
+ |
+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:55:13
+ |
+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:56:13
+ |
+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:57:23
+ |
+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:58:23
+ |
+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:67:14
+ |
+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:73:14
+ |
+LL | 0 => &mut x,
+ | ^^^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:85:13
+ |
+LL | let _ = (&x).0;
+ | ^^^^ help: change this to: `x`
+
+error: this expression borrows a value the compiler would automatically borrow
+ --> $DIR/needless_borrow.rs:87:22
+ |
+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:97:5
+ |
+LL | (&&()).foo();
+ | ^^^^^^ help: change this to: `(&())`
+
+error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:106:5
+ |
+LL | (&&5).foo();
+ | ^^^^^ help: change this to: `(&5)`
+
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:173:13
++ |
++LL | (&self.f)()
++ | ^^^^^^^^^ help: change this to: `(self.f)`
++
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:182:13
++ |
++LL | (&mut self.f)()
++ | ^^^^^^^^^^^^^ help: change this to: `(self.f)`
++
++error: aborting due to 22 previous errors
+
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::obfuscated_if_else)]
++
++fn main() {
++ if true { "a" } else { "b" };
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++
++#![warn(clippy::obfuscated_if_else)]
++
++fn main() {
++ true.then_some("a").unwrap_or("b");
++}
--- /dev/null
--- /dev/null
++error: use of `.then_some(..).unwrap_or(..)` can be written more clearly with `if .. else ..`
++ --> $DIR/obfuscated_if_else.rs:6:5
++ |
++LL | true.then_some("a").unwrap_or("b");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `if true { "a" } else { "b" }`
++ |
++ = note: `-D clippy::obfuscated-if-else` implied by `-D warnings`
++
++error: aborting due to previous error
++
--- /dev/null
+#![warn(clippy::std_instead_of_core)]
+#![allow(unused_imports)]
+
+extern crate alloc;
+
+#[warn(clippy::std_instead_of_core)]
+fn std_instead_of_core() {
+ // Regular import
+ use std::hash::Hasher;
+ // Absolute path
+ use ::std::hash::Hash;
++ // Don't lint on `env` macro
++ use std::env;
+
+ // Multiple imports
+ use std::fmt::{Debug, Result};
+
+ // Function calls
+ let ptr = std::ptr::null::<u32>();
+ let ptr_mut = ::std::ptr::null_mut::<usize>();
+
+ // Types
+ let cell = std::cell::Cell::new(8u32);
+ let cell_absolute = ::std::cell::Cell::new(8u32);
++
++ let _ = std::env!("PATH");
+}
+
+#[warn(clippy::std_instead_of_alloc)]
+fn std_instead_of_alloc() {
++ // Only lint once.
++ use std::vec;
+ use std::vec::Vec;
+}
+
+#[warn(clippy::alloc_instead_of_core)]
+fn alloc_instead_of_core() {
+ use alloc::slice::from_ref;
+}
+
+fn main() {
+ std_instead_of_core();
+ std_instead_of_alloc();
+ alloc_instead_of_core();
+}
--- /dev/null
- --> $DIR/std_instead_of_core.rs:14:20
+error: used import from `std` instead of `core`
+ --> $DIR/std_instead_of_core.rs:9:9
+ |
+LL | use std::hash::Hasher;
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::std-instead-of-core` implied by `-D warnings`
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
+ --> $DIR/std_instead_of_core.rs:11:9
+ |
+LL | use ::std::hash::Hash;
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:14:27
++ --> $DIR/std_instead_of_core.rs:16:20
+ |
+LL | use std::fmt::{Debug, Result};
+ | ^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:17:15
++ --> $DIR/std_instead_of_core.rs:16:27
+ |
+LL | use std::fmt::{Debug, Result};
+ | ^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:18:19
++ --> $DIR/std_instead_of_core.rs:19:15
+ |
+LL | let ptr = std::ptr::null::<u32>();
+ | ^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:21:16
++ --> $DIR/std_instead_of_core.rs:20:19
+ |
+LL | let ptr_mut = ::std::ptr::null_mut::<usize>();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:22:25
++ --> $DIR/std_instead_of_core.rs:23:16
+ |
+LL | let cell = std::cell::Cell::new(8u32);
+ | ^^^^^^^^^^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `core`
- --> $DIR/std_instead_of_core.rs:27:9
++ --> $DIR/std_instead_of_core.rs:24:25
+ |
+LL | let cell_absolute = ::std::cell::Cell::new(8u32);
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = help: consider importing the item from `core`
+
+error: used import from `std` instead of `alloc`
- = note: `-D clippy::std-instead-of-alloc` implied by `-D warnings`
++ --> $DIR/std_instead_of_core.rs:32:9
++ |
++LL | use std::vec;
++ | ^^^^^^^^
++ |
++ = note: `-D clippy::std-instead-of-alloc` implied by `-D warnings`
++ = help: consider importing the item from `alloc`
++
++error: used import from `std` instead of `alloc`
++ --> $DIR/std_instead_of_core.rs:33:9
+ |
+LL | use std::vec::Vec;
+ | ^^^^^^^^^^^^^
+ |
- --> $DIR/std_instead_of_core.rs:32:9
+ = help: consider importing the item from `alloc`
+
+error: used import from `alloc` instead of `core`
- error: aborting due to 10 previous errors
++ --> $DIR/std_instead_of_core.rs:38:9
+ |
+LL | use alloc::slice::from_ref;
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::alloc-instead-of-core` implied by `-D warnings`
+ = help: consider importing the item from `core`
+
++error: aborting due to 11 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 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() {}
projects / rust.git / commitdiff