--- /dev/null
- * [`blacklisted_name`]: Now allows blacklisted names in test code
+# 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`]: Remove `bar` from the default configuration
++* [`disallowed_names`]: Now allows disallowed names in test code
+ [#7379](https://github.com/rust-lang/rust-clippy/pull/7379)
+* [`redundant_closure`]: Suggests `&mut` for `FnMut`
+ [#7437](https://github.com/rust-lang/rust-clippy/pull/7437)
+* [`disallowed_methods`], [`disallowed_types`]: The configuration values `disallowed-method` and `disallowed-type`
+ no longer require fully qualified paths
+ [#7345](https://github.com/rust-lang/rust-clippy/pull/7345)
+* [`zst_offset`]: Fixed lint invocation after it was accidentally suppressed
+ [#7396](https://github.com/rust-lang/rust-clippy/pull/7396)
+
+### False Positive Fixes
+
+* [`default_numeric_fallback`]: No longer lints on float literals as function arguments
+ [#7446](https://github.com/rust-lang/rust-clippy/pull/7446)
+* [`use_self`]: No longer lints on type parameters
+ [#7288](https://github.com/rust-lang/rust-clippy/pull/7288)
+* [`unimplemented`]: Now ignores the `assert` and `debug_assert` macros
+ [#7439](https://github.com/rust-lang/rust-clippy/pull/7439)
+* [`branches_sharing_code`]: Now always checks for block expressions
+ [#7462](https://github.com/rust-lang/rust-clippy/pull/7462)
+* [`field_reassign_with_default`]: No longer triggers in macros
+ [#7160](https://github.com/rust-lang/rust-clippy/pull/7160)
+* [`redundant_clone`]: No longer lints on required clones for borrowed data
+ [#7346](https://github.com/rust-lang/rust-clippy/pull/7346)
+* [`default_numeric_fallback`]: No longer triggers in external macros
+ [#7325](https://github.com/rust-lang/rust-clippy/pull/7325)
+* [`needless_bool`]: No longer lints in macros
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`useless_format`]: No longer triggers when additional text is being appended
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`assertions_on_constants`]: `cfg!(...)` is no longer considered to be a constant
+ [#7319](https://github.com/rust-lang/rust-clippy/pull/7319)
+
+### Suggestion Fixes/Improvements
+
+* [`needless_collect`]: Now show correct lint messages for shadowed values
+ [#7289](https://github.com/rust-lang/rust-clippy/pull/7289)
+* [`wrong_pub_self_convention`]: The deprecated message now suggest the correct configuration value
+ [#7382](https://github.com/rust-lang/rust-clippy/pull/7382)
+* [`semicolon_if_nothing_returned`]: Allow missing semicolon in blocks with only one expression
+ [#7326](https://github.com/rust-lang/rust-clippy/pull/7326)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#7470](https://github.com/rust-lang/rust-clippy/pull/7470)
+* [`redundant_pattern_matching`]
+ [#7471](https://github.com/rust-lang/rust-clippy/pull/7471)
+* [`modulo_one`]
+ [#7473](https://github.com/rust-lang/rust-clippy/pull/7473)
+* [`use_self`]
+ [#7428](https://github.com/rust-lang/rust-clippy/pull/7428)
+
+## Rust 1.54
+
+Released 2021-07-29
+
+[7c7683c...3ae8faf](https://github.com/rust-lang/rust-clippy/compare/7c7683c...3ae8faf)
+
+### New Lints
+
+- [`ref_binding_to_reference`]
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`needless_bitwise_bool`]
+ [#7133](https://github.com/rust-lang/rust-clippy/pull/7133)
+- [`unused_async`] [#7225](https://github.com/rust-lang/rust-clippy/pull/7225)
+- [`manual_str_repeat`]
+ [#7265](https://github.com/rust-lang/rust-clippy/pull/7265)
+- [`suspicious_splitn`]
+ [#7292](https://github.com/rust-lang/rust-clippy/pull/7292)
+
+### Moves and Deprecations
+
+- Deprecate `pub_enum_variant_names` and `wrong_pub_self_convention` in favor of
+ the new `avoid-breaking-exported-api` config option (see
+ [Enhancements](#1-54-enhancements))
+ [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
+- Move [`inconsistent_struct_constructor`] to `pedantic`
+ [#7193](https://github.com/rust-lang/rust-clippy/pull/7193)
+- Move [`needless_borrow`] to `style` (now warn-by-default)
+ [#7254](https://github.com/rust-lang/rust-clippy/pull/7254)
+- Move [`suspicious_operation_groupings`] to `nursery`
+ [#7266](https://github.com/rust-lang/rust-clippy/pull/7266)
+- Move [`semicolon_if_nothing_returned`] to `pedantic`
+ [#7268](https://github.com/rust-lang/rust-clippy/pull/7268)
+
+### Enhancements <a name="1-54-enhancements"></a>
+
+- [`while_let_on_iterator`]: Now also lints in nested loops
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`single_char_pattern`]: Now also lints on `strip_prefix` and `strip_suffix`
+ [#7156](https://github.com/rust-lang/rust-clippy/pull/7156)
+- [`needless_collect`]: Now also lints on assignments with type annotations
+ [#7163](https://github.com/rust-lang/rust-clippy/pull/7163)
+- [`if_then_some_else_none`]: Now works with the MSRV config
+ [#7177](https://github.com/rust-lang/rust-clippy/pull/7177)
+- Add `avoid-breaking-exported-api` config option for the lints
+ [`enum_variant_names`], [`large_types_passed_by_value`],
+ [`trivially_copy_pass_by_ref`], [`unnecessary_wraps`],
+ [`upper_case_acronyms`], and [`wrong_self_convention`]. We recommend to set
+ this configuration option to `false` before a major release (1.0/2.0/...) to
+ clean up the API [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
+- [`needless_collect`]: Now lints on even more data structures
+ [#7188](https://github.com/rust-lang/rust-clippy/pull/7188)
+- [`missing_docs_in_private_items`]: No longer sees `#[<name> = "<value>"]` like
+ attributes as sufficient documentation
+ [#7281](https://github.com/rust-lang/rust-clippy/pull/7281)
+- [`needless_collect`], [`short_circuit_statement`], [`unnecessary_operation`]:
+ Now work as expected when used with `allow`
+ [#7282](https://github.com/rust-lang/rust-clippy/pull/7282)
+
+### False Positive Fixes
+
+- [`implicit_return`]: Now takes all diverging functions in account to avoid
+ false positives [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
+- [`while_let_on_iterator`]: No longer lints when the iterator is a struct field
+ and the struct is used in the loop
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`multiple_inherent_impl`]: No longer lints with generic arguments
+ [#7089](https://github.com/rust-lang/rust-clippy/pull/7089)
+- [`comparison_chain`]: No longer lints in a `const` context
+ [#7118](https://github.com/rust-lang/rust-clippy/pull/7118)
+- [`while_immutable_condition`]: Fix false positive where mutation in the loop
+ variable wasn't picked up
+ [#7144](https://github.com/rust-lang/rust-clippy/pull/7144)
+- [`default_trait_access`]: No longer lints in macros
+ [#7150](https://github.com/rust-lang/rust-clippy/pull/7150)
+- [`needless_question_mark`]: No longer lints when the inner value is implicitly
+ dereferenced [#7165](https://github.com/rust-lang/rust-clippy/pull/7165)
+- [`unused_unit`]: No longer lints when multiple macro contexts are involved
+ [#7167](https://github.com/rust-lang/rust-clippy/pull/7167)
+- [`eval_order_dependence`]: Fix false positive in async context
+ [#7174](https://github.com/rust-lang/rust-clippy/pull/7174)
+- [`unnecessary_filter_map`]: No longer lints if the `filter_map` changes the
+ type [#7175](https://github.com/rust-lang/rust-clippy/pull/7175)
+- [`wrong_self_convention`]: No longer lints in trait implementations of
+ non-`Copy` types [#7182](https://github.com/rust-lang/rust-clippy/pull/7182)
+- [`suboptimal_flops`]: No longer lints on `powi(2)`
+ [#7201](https://github.com/rust-lang/rust-clippy/pull/7201)
+- [`wrong_self_convention`]: No longer lints if there is no implicit `self`
+ [#7215](https://github.com/rust-lang/rust-clippy/pull/7215)
+- [`option_if_let_else`]: No longer lints on `else if let` pattern
+ [#7216](https://github.com/rust-lang/rust-clippy/pull/7216)
+- [`use_self`], [`useless_conversion`]: Fix false positives when generic
+ arguments are involved
+ [#7223](https://github.com/rust-lang/rust-clippy/pull/7223)
+- [`manual_unwrap_or`]: Fix false positive with deref coercion
+ [#7233](https://github.com/rust-lang/rust-clippy/pull/7233)
+- [`similar_names`]: No longer lints on `wparam`/`lparam`
+ [#7255](https://github.com/rust-lang/rust-clippy/pull/7255)
+- [`redundant_closure`]: No longer lints on using the `vec![]` macro in a
+ closure [#7263](https://github.com/rust-lang/rust-clippy/pull/7263)
+
+### Suggestion Fixes/Improvements
+
+- [`implicit_return`]
+ [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
+ - Fix suggestion for async functions
+ - Improve suggestion with macros
+ - Suggest to change `break` to `return` when appropriate
+- [`while_let_on_iterator`]: Now suggests `&mut iter` when necessary
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`match_single_binding`]: Improve suggestion when match scrutinee has side
+ effects [#7095](https://github.com/rust-lang/rust-clippy/pull/7095)
+- [`needless_borrow`]: Now suggests to also change usage sites as needed
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`write_with_newline`]: Improve suggestion when only `\n` is written to the
+ buffer [#7183](https://github.com/rust-lang/rust-clippy/pull/7183)
+- [`from_iter_instead_of_collect`]: The suggestion is now auto applicable also
+ when a `<_ as Trait>::_` is involved
+ [#7264](https://github.com/rust-lang/rust-clippy/pull/7264)
+- [`not_unsafe_ptr_arg_deref`]: Improved error message
+ [#7294](https://github.com/rust-lang/rust-clippy/pull/7294)
+
+### ICE Fixes
+
+- Fix ICE when running Clippy on `libstd`
+ [#7140](https://github.com/rust-lang/rust-clippy/pull/7140)
+- [`implicit_return`]
+ [#7242](https://github.com/rust-lang/rust-clippy/pull/7242)
+
+## Rust 1.53
+
+Released 2021-06-17
+
+[6ed6f1e...7c7683c](https://github.com/rust-lang/rust-clippy/compare/6ed6f1e...7c7683c)
+
+### New Lints
+
+* [`option_filter_map`]
+ [#6342](https://github.com/rust-lang/rust-clippy/pull/6342)
+* [`branches_sharing_code`]
+ [#6463](https://github.com/rust-lang/rust-clippy/pull/6463)
+* [`needless_for_each`]
+ [#6706](https://github.com/rust-lang/rust-clippy/pull/6706)
+* [`if_then_some_else_none`]
+ [#6859](https://github.com/rust-lang/rust-clippy/pull/6859)
+* [`non_octal_unix_permissions`]
+ [#7001](https://github.com/rust-lang/rust-clippy/pull/7001)
+* [`unnecessary_self_imports`]
+ [#7072](https://github.com/rust-lang/rust-clippy/pull/7072)
+* [`bool_assert_comparison`]
+ [#7083](https://github.com/rust-lang/rust-clippy/pull/7083)
+* [`cloned_instead_of_copied`]
+ [#7098](https://github.com/rust-lang/rust-clippy/pull/7098)
+* [`flat_map_option`]
+ [#7101](https://github.com/rust-lang/rust-clippy/pull/7101)
+
+### Moves and Deprecations
+
+* Deprecate [`filter_map`] lint
+ [#7059](https://github.com/rust-lang/rust-clippy/pull/7059)
+* Move [`transmute_ptr_to_ptr`] to `pedantic`
+ [#7102](https://github.com/rust-lang/rust-clippy/pull/7102)
+
+### Enhancements
+
+* [`mem_replace_with_default`]: Also lint on common std constructors
+ [#6820](https://github.com/rust-lang/rust-clippy/pull/6820)
+* [`wrong_self_convention`]: Also lint on `to_*_mut` methods
+ [#6828](https://github.com/rust-lang/rust-clippy/pull/6828)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]:
+ [#6863](https://github.com/rust-lang/rust-clippy/pull/6863)
+ * Attempt to find a common path prefix in suggestion
+ * Don't lint on `Option` and `Result`
+ * Consider `Self` prefix
+* [`explicit_deref_methods`]: Also lint on chained `deref` calls
+ [#6865](https://github.com/rust-lang/rust-clippy/pull/6865)
+* [`or_fun_call`]: Also lint on `unsafe` blocks
+ [#6928](https://github.com/rust-lang/rust-clippy/pull/6928)
+* [`vec_box`], [`linkedlist`], [`option_option`]: Also lint in `const` and
+ `static` items [#6938](https://github.com/rust-lang/rust-clippy/pull/6938)
+* [`search_is_some`]: Also check for `is_none`
+ [#6942](https://github.com/rust-lang/rust-clippy/pull/6942)
+* [`string_lit_as_bytes`]: Also lint on `into_bytes`
+ [#6959](https://github.com/rust-lang/rust-clippy/pull/6959)
+* [`len_without_is_empty`]: Also lint if function signatures of `len` and
+ `is_empty` don't match
+ [#6980](https://github.com/rust-lang/rust-clippy/pull/6980)
+* [`redundant_pattern_matching`]: Also lint if the pattern is a `&` pattern
+ [#6991](https://github.com/rust-lang/rust-clippy/pull/6991)
+* [`clone_on_copy`]: Also lint on chained method calls taking `self` by value
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`missing_panics_doc`]: Also lint on `assert_eq!` and `assert_ne!`
+ [#7029](https://github.com/rust-lang/rust-clippy/pull/7029)
+* [`needless_return`]: Also lint in `async` functions
+ [#7067](https://github.com/rust-lang/rust-clippy/pull/7067)
+* [`unused_io_amount`]: Also lint on expressions like `_.read().ok()?`
+ [#7100](https://github.com/rust-lang/rust-clippy/pull/7100)
+* [`iter_cloned_collect`]: Also lint on large arrays, since const-generics are
+ now stable [#7138](https://github.com/rust-lang/rust-clippy/pull/7138)
+
+### False Positive Fixes
+
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6805](https://github.com/rust-lang/rust-clippy/pull/6805)
+* [`suspicious_map`]: No longer lints when side effects may occur inside the
+ `map` call [#6831](https://github.com/rust-lang/rust-clippy/pull/6831)
+* [`manual_map`], [`manual_unwrap_or`]: No longer lints in `const` functions
+ [#6917](https://github.com/rust-lang/rust-clippy/pull/6917)
+* [`wrong_self_convention`]: Now respects `Copy` types
+ [#6924](https://github.com/rust-lang/rust-clippy/pull/6924)
+* [`needless_question_mark`]: No longer lints if the `?` and the `Some(..)` come
+ from different macro contexts [#6935](https://github.com/rust-lang/rust-clippy/pull/6935)
+* [`map_entry`]: Better detect if the entry API can be used
+ [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`or_fun_call`]: No longer lints on some `len` function calls
+ [#6950](https://github.com/rust-lang/rust-clippy/pull/6950)
+* [`new_ret_no_self`]: No longer lints when `Self` is returned with different
+ generic arguments [#6952](https://github.com/rust-lang/rust-clippy/pull/6952)
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6981](https://github.com/rust-lang/rust-clippy/pull/6981)
+* [`explicit_into_iter_loop`]: Only lint when `into_iter` is an implementation
+ of `IntoIterator` [#6982](https://github.com/rust-lang/rust-clippy/pull/6982)
+* [`expl_impl_clone_on_copy`]: Take generic constraints into account before
+ suggesting to use `derive` instead
+ [#6993](https://github.com/rust-lang/rust-clippy/pull/6993)
+* [`missing_panics_doc`]: No longer lints when only debug-assertions are used
+ [#6996](https://github.com/rust-lang/rust-clippy/pull/6996)
+* [`clone_on_copy`]: Only lint when using the `Clone` trait
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`wrong_self_convention`]: No longer lints inside a trait implementation
+ [#7002](https://github.com/rust-lang/rust-clippy/pull/7002)
+* [`redundant_clone`]: No longer lints when the cloned value is modified while
+ the clone is in use
+ [#7011](https://github.com/rust-lang/rust-clippy/pull/7011)
+* [`same_item_push`]: No longer lints if the `Vec` is used in the loop body
+ [#7018](https://github.com/rust-lang/rust-clippy/pull/7018)
+* [`cargo_common_metadata`]: Remove author requirement
+ [#7026](https://github.com/rust-lang/rust-clippy/pull/7026)
+* [`panic_in_result_fn`]: No longer lints on `debug_assert` family
+ [#7060](https://github.com/rust-lang/rust-clippy/pull/7060)
+* [`panic`]: No longer wrongfully lints on `debug_assert` with message
+ [#7063](https://github.com/rust-lang/rust-clippy/pull/7063)
+* [`wrong_self_convention`]: No longer lints in trait implementations where no
+ `self` is involved [#7064](https://github.com/rust-lang/rust-clippy/pull/7064)
+* [`missing_const_for_fn`]: No longer lints when unstable `const` function is
+ involved [#7076](https://github.com/rust-lang/rust-clippy/pull/7076)
+* [`suspicious_else_formatting`]: Allow Allman style braces
+ [#7087](https://github.com/rust-lang/rust-clippy/pull/7087)
+* [`inconsistent_struct_constructor`]: No longer lints in macros
+ [#7097](https://github.com/rust-lang/rust-clippy/pull/7097)
+* [`single_component_path_imports`]: No longer lints on macro re-exports
+ [#7120](https://github.com/rust-lang/rust-clippy/pull/7120)
+
+### Suggestion Fixes/Improvements
+
+* [`redundant_pattern_matching`]: Add a note when applying this lint would
+ change the drop order
+ [#6568](https://github.com/rust-lang/rust-clippy/pull/6568)
+* [`write_literal`], [`print_literal`]: Add auto-applicable suggestion
+ [#6821](https://github.com/rust-lang/rust-clippy/pull/6821)
+* [`manual_map`]: Fix suggestion for complex `if let ... else` chains
+ [#6856](https://github.com/rust-lang/rust-clippy/pull/6856)
+* [`inconsistent_struct_constructor`]: Make lint description and message clearer
+ [#6892](https://github.com/rust-lang/rust-clippy/pull/6892)
+* [`map_entry`]: Now suggests `or_insert`, `insert_with` or `match _.entry(_)`
+ as appropriate [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`manual_flatten`]: Suggest to insert `copied` if necessary
+ [#6962](https://github.com/rust-lang/rust-clippy/pull/6962)
+* [`redundant_slicing`]: Fix suggestion when a re-borrow might be required or
+ when the value is from a macro call
+ [#6975](https://github.com/rust-lang/rust-clippy/pull/6975)
+* [`match_wildcard_for_single_variants`]: Fix suggestion for hidden variant
+ [#6988](https://github.com/rust-lang/rust-clippy/pull/6988)
+* [`clone_on_copy`]: Correct suggestion when the cloned value is a macro call
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`manual_map`]: Fix suggestion at the end of an if chain
+ [#7004](https://github.com/rust-lang/rust-clippy/pull/7004)
+* Fix needless parenthesis output in multiple lint suggestions
+ [#7013](https://github.com/rust-lang/rust-clippy/pull/7013)
+* [`needless_collect`]: Better explanation in the lint message
+ [#7020](https://github.com/rust-lang/rust-clippy/pull/7020)
+* [`useless_vec`]: Now considers mutability
+ [#7036](https://github.com/rust-lang/rust-clippy/pull/7036)
+* [`useless_format`]: Wrap the content in braces if necessary
+ [#7092](https://github.com/rust-lang/rust-clippy/pull/7092)
+* [`single_match`]: Don't suggest an equality check for types which don't
+ implement `PartialEq`
+ [#7093](https://github.com/rust-lang/rust-clippy/pull/7093)
+* [`from_over_into`]: Mention type in help message
+ [#7099](https://github.com/rust-lang/rust-clippy/pull/7099)
+* [`manual_unwrap_or`]: Fix invalid code suggestion due to a macro call
+ [#7136](https://github.com/rust-lang/rust-clippy/pull/7136)
+
+### ICE Fixes
+
+* [`macro_use_imports`]
+ [#7022](https://github.com/rust-lang/rust-clippy/pull/7022)
+* [`missing_panics_doc`]
+ [#7034](https://github.com/rust-lang/rust-clippy/pull/7034)
+* [`tabs_in_doc_comments`]
+ [#7039](https://github.com/rust-lang/rust-clippy/pull/7039)
+* [`missing_const_for_fn`]
+ [#7128](https://github.com/rust-lang/rust-clippy/pull/7128)
+
+### Others
+
+* [Clippy's lint
+ list](https://rust-lang.github.io/rust-clippy/master/index.html) now supports
+ themes [#7030](https://github.com/rust-lang/rust-clippy/pull/7030)
+* Lints that were uplifted to `rustc` now mention the new `rustc` name in the
+ deprecation warning
+ [#7056](https://github.com/rust-lang/rust-clippy/pull/7056)
+
+## Rust 1.52
+
+Released 2021-05-06
+
+[3e41797...6ed6f1e](https://github.com/rust-lang/rust-clippy/compare/3e41797...6ed6f1e)
+
+### New Lints
+
+* [`from_str_radix_10`]
+ [#6717](https://github.com/rust-lang/rust-clippy/pull/6717)
+* [`implicit_clone`]
+ [#6730](https://github.com/rust-lang/rust-clippy/pull/6730)
+* [`semicolon_if_nothing_returned`]
+ [#6681](https://github.com/rust-lang/rust-clippy/pull/6681)
+* [`manual_flatten`]
+ [#6646](https://github.com/rust-lang/rust-clippy/pull/6646)
+* [`inconsistent_struct_constructor`]
+ [#6769](https://github.com/rust-lang/rust-clippy/pull/6769)
+* [`iter_count`]
+ [#6791](https://github.com/rust-lang/rust-clippy/pull/6791)
+* [`default_numeric_fallback`]
+ [#6662](https://github.com/rust-lang/rust-clippy/pull/6662)
+* [`bytes_nth`]
+ [#6695](https://github.com/rust-lang/rust-clippy/pull/6695)
+* [`filter_map_identity`]
+ [#6685](https://github.com/rust-lang/rust-clippy/pull/6685)
+* [`manual_map`]
+ [#6573](https://github.com/rust-lang/rust-clippy/pull/6573)
+
+### Moves and Deprecations
+
+* Moved [`upper_case_acronyms`] to `pedantic`
+ [#6775](https://github.com/rust-lang/rust-clippy/pull/6775)
+* Moved [`manual_map`] to `nursery`
+ [#6796](https://github.com/rust-lang/rust-clippy/pull/6796)
+* Moved [`unnecessary_wraps`] to `pedantic`
+ [#6765](https://github.com/rust-lang/rust-clippy/pull/6765)
+* Moved [`trivial_regex`] to `nursery`
+ [#6696](https://github.com/rust-lang/rust-clippy/pull/6696)
+* Moved [`naive_bytecount`] to `pedantic`
+ [#6825](https://github.com/rust-lang/rust-clippy/pull/6825)
+* Moved [`upper_case_acronyms`] to `style`
+ [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
+* Moved [`manual_map`] to `style`
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+
+### Enhancements
+
+* [`disallowed_methods`]: Now supports functions in addition to methods
+ [#6674](https://github.com/rust-lang/rust-clippy/pull/6674)
+* [`upper_case_acronyms`]: Added a new configuration `upper-case-acronyms-aggressive` to
+ trigger the lint if there is more than one uppercase character next to each other
+ [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
+* [`collapsible_match`]: Now supports block comparison with different value names
+ [#6754](https://github.com/rust-lang/rust-clippy/pull/6754)
+* [`unnecessary_wraps`]: Will now suggest removing unnecessary wrapped return unit type, like `Option<()>`
+ [#6665](https://github.com/rust-lang/rust-clippy/pull/6665)
+* Improved value usage detection in closures
+ [#6698](https://github.com/rust-lang/rust-clippy/pull/6698)
+
+### False Positive Fixes
+
+* [`use_self`]: No longer lints in macros
+ [#6833](https://github.com/rust-lang/rust-clippy/pull/6833)
+* [`use_self`]: Fixed multiple false positives for: generics, associated types and derive implementations
+ [#6179](https://github.com/rust-lang/rust-clippy/pull/6179)
+* [`missing_inline_in_public_items`]: No longer lints for procedural macros
+ [#6814](https://github.com/rust-lang/rust-clippy/pull/6814)
+* [`inherent_to_string`]: No longer lints on functions with function generics
+ [#6771](https://github.com/rust-lang/rust-clippy/pull/6771)
+* [`doc_markdown`]: Add `OpenDNS` to the default configuration as an allowed identifier
+ [#6783](https://github.com/rust-lang/rust-clippy/pull/6783)
+* [`missing_panics_doc`]: No longer lints on [`unreachable!`](https://doc.rust-lang.org/std/macro.unreachable.html)
+ [#6700](https://github.com/rust-lang/rust-clippy/pull/6700)
+* [`collapsible_if`]: No longer lints on if statements with attributes
+ [#6701](https://github.com/rust-lang/rust-clippy/pull/6701)
+* [`match_same_arms`]: Only considers empty blocks as equal if the tokens contained are the same
+ [#6843](https://github.com/rust-lang/rust-clippy/pull/6843)
+* [`redundant_closure`]: Now ignores macros
+ [#6871](https://github.com/rust-lang/rust-clippy/pull/6871)
+* [`manual_map`]: Fixed false positives when control flow statements like `return`, `break` etc. are used
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* [`vec_init_then_push`]: Fixed false positives for loops and if statements
+ [#6697](https://github.com/rust-lang/rust-clippy/pull/6697)
+* [`len_without_is_empty`]: Will now consider multiple impl blocks and `#[allow]` on
+ the `len` method as well as the type definition.
+ [#6853](https://github.com/rust-lang/rust-clippy/pull/6853)
+* [`let_underscore_drop`]: Only lints on types which implement `Drop`
+ [#6682](https://github.com/rust-lang/rust-clippy/pull/6682)
+* [`unit_arg`]: No longer lints on unit arguments when they come from a path expression.
+ [#6601](https://github.com/rust-lang/rust-clippy/pull/6601)
+* [`cargo_common_metadata`]: No longer lints if
+ [`publish = false`](https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field)
+ is defined in the manifest
+ [#6650](https://github.com/rust-lang/rust-clippy/pull/6650)
+
+### Suggestion Fixes/Improvements
+
+* [`collapsible_match`]: Fixed lint message capitalization
+ [#6766](https://github.com/rust-lang/rust-clippy/pull/6766)
+* [`or_fun_call`]: Improved suggestions for `or_insert(vec![])`
+ [#6790](https://github.com/rust-lang/rust-clippy/pull/6790)
+* [`manual_map`]: No longer expands macros in the suggestions
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* Aligned Clippy's lint messages with the rustc dev guide
+ [#6787](https://github.com/rust-lang/rust-clippy/pull/6787)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6866](https://github.com/rust-lang/rust-clippy/pull/6866)
+
+### Documentation Improvements
+
+* [`useless_format`]: Improved the documentation example
+ [#6854](https://github.com/rust-lang/rust-clippy/pull/6854)
+* Clippy's [`README.md`]: Includes a new subsection on running Clippy as a rustc wrapper
+ [#6782](https://github.com/rust-lang/rust-clippy/pull/6782)
+
+### Others
+* Running `cargo clippy` after `cargo check` now works as expected
+ (`cargo clippy` and `cargo check` no longer shares the same build cache)
+ [#6687](https://github.com/rust-lang/rust-clippy/pull/6687)
+* Cargo now re-runs Clippy if arguments after `--` provided to `cargo clippy` are changed.
+ [#6834](https://github.com/rust-lang/rust-clippy/pull/6834)
+* Extracted Clippy's `utils` module into the new `clippy_utils` crate
+ [#6756](https://github.com/rust-lang/rust-clippy/pull/6756)
+* Clippy lintcheck tool improvements
+ [#6800](https://github.com/rust-lang/rust-clippy/pull/6800)
+ [#6735](https://github.com/rust-lang/rust-clippy/pull/6735)
+ [#6764](https://github.com/rust-lang/rust-clippy/pull/6764)
+ [#6708](https://github.com/rust-lang/rust-clippy/pull/6708)
+ [#6780](https://github.com/rust-lang/rust-clippy/pull/6780)
+ [#6686](https://github.com/rust-lang/rust-clippy/pull/6686)
+
+## Rust 1.51
+
+Released 2021-03-25
+
+[4911ab1...3e41797](https://github.com/rust-lang/rust-clippy/compare/4911ab1...3e41797)
+
+### New Lints
+
+* [`upper_case_acronyms`]
+ [#6475](https://github.com/rust-lang/rust-clippy/pull/6475)
+* [`from_over_into`] [#6476](https://github.com/rust-lang/rust-clippy/pull/6476)
+* [`case_sensitive_file_extension_comparisons`]
+ [#6500](https://github.com/rust-lang/rust-clippy/pull/6500)
+* [`needless_question_mark`]
+ [#6507](https://github.com/rust-lang/rust-clippy/pull/6507)
+* [`missing_panics_doc`]
+ [#6523](https://github.com/rust-lang/rust-clippy/pull/6523)
+* [`redundant_slicing`]
+ [#6528](https://github.com/rust-lang/rust-clippy/pull/6528)
+* [`vec_init_then_push`]
+ [#6538](https://github.com/rust-lang/rust-clippy/pull/6538)
+* [`ptr_as_ptr`] [#6542](https://github.com/rust-lang/rust-clippy/pull/6542)
+* [`collapsible_else_if`] (split out from `collapsible_if`)
+ [#6544](https://github.com/rust-lang/rust-clippy/pull/6544)
+* [`inspect_for_each`] [#6577](https://github.com/rust-lang/rust-clippy/pull/6577)
+* [`manual_filter_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* [`exhaustive_enums`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+* [`exhaustive_structs`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+
+### Moves and Deprecations
+
+* Replace [`find_map`] with [`manual_find_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* `unknown_clippy_lints` Now integrated in the `unknown_lints` rustc lint
+ [#6653](https://github.com/rust-lang/rust-clippy/pull/6653)
+
+### Enhancements
+
+* [`ptr_arg`] Now also suggests to use `&Path` instead of `&PathBuf`
+ [#6506](https://github.com/rust-lang/rust-clippy/pull/6506)
+* [`cast_ptr_alignment`] Also lint when the `pointer::cast` method is used
+ [#6557](https://github.com/rust-lang/rust-clippy/pull/6557)
+* [`collapsible_match`] Now also deals with `&` and `*` operators in the `match`
+ scrutinee [#6619](https://github.com/rust-lang/rust-clippy/pull/6619)
+
+### False Positive Fixes
+
+* [`similar_names`] Ignore underscore prefixed names
+ [#6403](https://github.com/rust-lang/rust-clippy/pull/6403)
+* [`print_literal`] and [`write_literal`] No longer lint numeric literals
+ [#6408](https://github.com/rust-lang/rust-clippy/pull/6408)
+* [`large_enum_variant`] No longer lints in external macros
+ [#6485](https://github.com/rust-lang/rust-clippy/pull/6485)
+* [`empty_enum`] Only lint if `never_type` feature is enabled
+ [#6513](https://github.com/rust-lang/rust-clippy/pull/6513)
+* [`field_reassign_with_default`] No longer lints in macros
+ [#6553](https://github.com/rust-lang/rust-clippy/pull/6553)
+* [`size_of_in_element_count`] No longer lints when dividing by element size
+ [#6578](https://github.com/rust-lang/rust-clippy/pull/6578)
+* [`needless_return`] No longer lints in macros
+ [#6586](https://github.com/rust-lang/rust-clippy/pull/6586)
+* [`match_overlapping_arm`] No longer lint when first arm is completely included
+ in second arm [#6603](https://github.com/rust-lang/rust-clippy/pull/6603)
+* [`doc_markdown`] Add `WebGL` to the default configuration as an allowed
+ identifier [#6605](https://github.com/rust-lang/rust-clippy/pull/6605)
+
+### Suggestion Fixes/Improvements
+
+* [`field_reassign_with_default`] Don't expand macro in lint suggestion
+ [#6531](https://github.com/rust-lang/rust-clippy/pull/6531)
+* [`match_like_matches_macro`] Strip references in suggestion
+ [#6532](https://github.com/rust-lang/rust-clippy/pull/6532)
+* [`single_match`] Suggest `if` over `if let` when possible
+ [#6574](https://github.com/rust-lang/rust-clippy/pull/6574)
+* `ref_in_deref` Use parentheses correctly in suggestion
+ [#6609](https://github.com/rust-lang/rust-clippy/pull/6609)
+* [`stable_sort_primitive`] Clarify error message
+ [#6611](https://github.com/rust-lang/rust-clippy/pull/6611)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6582](https://github.com/rust-lang/rust-clippy/pull/6582)
+
+### Documentation Improvements
+
+* Improve search performance on the Clippy website and make it possible to
+ directly search for lints on the GitHub issue tracker
+ [#6483](https://github.com/rust-lang/rust-clippy/pull/6483)
+* Clean up `README.md` by removing outdated paragraph
+ [#6488](https://github.com/rust-lang/rust-clippy/pull/6488)
+* [`await_holding_refcell_ref`] and [`await_holding_lock`]
+ [#6585](https://github.com/rust-lang/rust-clippy/pull/6585)
+* [`as_conversions`] [#6608](https://github.com/rust-lang/rust-clippy/pull/6608)
+
+### Others
+
+* Clippy now has a [Roadmap] for 2021. If you like to get involved in a bigger
+ project, take a look at the [Roadmap project page]. All issues listed there
+ are actively mentored
+ [#6462](https://github.com/rust-lang/rust-clippy/pull/6462)
+* The Clippy version number now corresponds to the Rust version number
+ [#6526](https://github.com/rust-lang/rust-clippy/pull/6526)
+* Fix oversight which caused Clippy to lint deps in some environments, where
+ `CLIPPY_TESTS=true` was set somewhere
+ [#6575](https://github.com/rust-lang/rust-clippy/pull/6575)
+* Add `cargo dev-lintcheck` tool to the Clippy Dev Tool
+ [#6469](https://github.com/rust-lang/rust-clippy/pull/6469)
+
+[Roadmap]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/proposals/roadmap-2021.md
+[Roadmap project page]: https://github.com/rust-lang/rust-clippy/projects/3
+
+## Rust 1.50
+
+Released 2021-02-11
+
+[b20d4c1...4bd77a1](https://github.com/rust-lang/rust-clippy/compare/b20d4c1...4bd77a1)
+
+### New Lints
+
+* [`suspicious_operation_groupings`] [#6086](https://github.com/rust-lang/rust-clippy/pull/6086)
+* [`size_of_in_element_count`] [#6394](https://github.com/rust-lang/rust-clippy/pull/6394)
+* [`unnecessary_wraps`] [#6070](https://github.com/rust-lang/rust-clippy/pull/6070)
+* [`let_underscore_drop`] [#6305](https://github.com/rust-lang/rust-clippy/pull/6305)
+* [`collapsible_match`] [#6402](https://github.com/rust-lang/rust-clippy/pull/6402)
+* [`redundant_else`] [#6330](https://github.com/rust-lang/rust-clippy/pull/6330)
+* [`zero_sized_map_values`] [#6218](https://github.com/rust-lang/rust-clippy/pull/6218)
+* [`print_stderr`] [#6367](https://github.com/rust-lang/rust-clippy/pull/6367)
+* [`string_from_utf8_as_bytes`] [#6134](https://github.com/rust-lang/rust-clippy/pull/6134)
+
+### Moves and Deprecations
+
+* Previously deprecated [`str_to_string`] and [`string_to_string`] have been un-deprecated
+ as `restriction` lints [#6333](https://github.com/rust-lang/rust-clippy/pull/6333)
+* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panics`
+ [#6351](https://github.com/rust-lang/rust-clippy/pull/6351)
+* Move [`map_err_ignore`] to `restriction`
+ [#6416](https://github.com/rust-lang/rust-clippy/pull/6416)
+* Move [`await_holding_refcell_ref`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+* Move [`await_holding_lock`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+
+### Enhancements
+
+* Add the `unreadable-literal-lint-fractions` configuration to disable
+ the `unreadable_literal` lint for fractions
+ [#6421](https://github.com/rust-lang/rust-clippy/pull/6421)
+* [`clone_on_copy`]: Now shows the type in the lint message
+ [#6443](https://github.com/rust-lang/rust-clippy/pull/6443)
+* [`redundant_pattern_matching`]: Now also lints on `std::task::Poll`
+ [#6339](https://github.com/rust-lang/rust-clippy/pull/6339)
+* [`redundant_pattern_matching`]: Additionally also lints on `std::net::IpAddr`
+ [#6377](https://github.com/rust-lang/rust-clippy/pull/6377)
+* [`search_is_some`]: Now suggests `contains` instead of `find(foo).is_some()`
+ [#6119](https://github.com/rust-lang/rust-clippy/pull/6119)
+* [`clone_double_ref`]: Now prints the reference type in the lint message
+ [#6442](https://github.com/rust-lang/rust-clippy/pull/6442)
+* [`modulo_one`]: Now also lints on -1.
+ [#6360](https://github.com/rust-lang/rust-clippy/pull/6360)
+* [`empty_loop`]: Now lints no_std crates, too
+ [#6205](https://github.com/rust-lang/rust-clippy/pull/6205)
+* [`or_fun_call`]: Now also lints when indexing `HashMap` or `BTreeMap`
+ [#6267](https://github.com/rust-lang/rust-clippy/pull/6267)
+* [`wrong_self_convention`]: Now also lints in trait definitions
+ [#6316](https://github.com/rust-lang/rust-clippy/pull/6316)
+* [`needless_borrow`]: Print the type in the lint message
+ [#6449](https://github.com/rust-lang/rust-clippy/pull/6449)
+
+[msrv_readme]: https://github.com/rust-lang/rust-clippy#specifying-the-minimum-supported-rust-version
+
+### False Positive Fixes
+
+* [`manual_range_contains`]: No longer lints in `const fn`
+ [#6382](https://github.com/rust-lang/rust-clippy/pull/6382)
+* [`unnecessary_lazy_evaluations`]: No longer lints if closure argument is used
+ [#6370](https://github.com/rust-lang/rust-clippy/pull/6370)
+* [`match_single_binding`]: Now ignores cases with `#[cfg()]` macros
+ [#6435](https://github.com/rust-lang/rust-clippy/pull/6435)
+* [`match_like_matches_macro`]: No longer lints on arms with attributes
+ [#6290](https://github.com/rust-lang/rust-clippy/pull/6290)
+* [`map_clone`]: No longer lints with deref and clone
+ [#6269](https://github.com/rust-lang/rust-clippy/pull/6269)
+* [`map_clone`]: No longer lints in the case of &mut
+ [#6301](https://github.com/rust-lang/rust-clippy/pull/6301)
+* [`needless_update`]: Now ignores `non_exhaustive` structs
+ [#6464](https://github.com/rust-lang/rust-clippy/pull/6464)
+* [`needless_collect`]: No longer lints when a collect is needed multiple times
+ [#6313](https://github.com/rust-lang/rust-clippy/pull/6313)
+* [`unnecessary_cast`] No longer lints cfg-dependent types
+ [#6369](https://github.com/rust-lang/rust-clippy/pull/6369)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]:
+ Both now ignore enums with frozen variants
+ [#6110](https://github.com/rust-lang/rust-clippy/pull/6110)
+* [`field_reassign_with_default`] No longer lint for private fields
+ [#6537](https://github.com/rust-lang/rust-clippy/pull/6537)
+
+
+### Suggestion Fixes/Improvements
+
+* [`vec_box`]: Provide correct type scope suggestion
+ [#6271](https://github.com/rust-lang/rust-clippy/pull/6271)
+* [`manual_range_contains`]: Give correct suggestion when using floats
+ [#6320](https://github.com/rust-lang/rust-clippy/pull/6320)
+* [`unnecessary_lazy_evaluations`]: Don't always mark suggestion as MachineApplicable
+ [#6272](https://github.com/rust-lang/rust-clippy/pull/6272)
+* [`manual_async_fn`]: Improve suggestion formatting
+ [#6294](https://github.com/rust-lang/rust-clippy/pull/6294)
+* [`unnecessary_cast`]: Fix incorrectly formatted float literal suggestion
+ [#6362](https://github.com/rust-lang/rust-clippy/pull/6362)
+
+### ICE Fixes
+
+* Fix a crash in [`from_iter_instead_of_collect`]
+ [#6304](https://github.com/rust-lang/rust-clippy/pull/6304)
+* Fix a silent crash when parsing doc comments in [`needless_doctest_main`]
+ [#6458](https://github.com/rust-lang/rust-clippy/pull/6458)
+
+### Documentation Improvements
+
+* The lint website search has been improved ([#6477](https://github.com/rust-lang/rust-clippy/pull/6477)):
+ * Searching for lints with dashes and spaces is possible now. For example
+ `missing-errors-doc` and `missing errors doc` are now valid aliases for lint names
+ * Improved fuzzy search in lint descriptions
+* Various README improvements
+ [#6287](https://github.com/rust-lang/rust-clippy/pull/6287)
+* Add known problems to [`comparison_chain`] documentation
+ [#6390](https://github.com/rust-lang/rust-clippy/pull/6390)
+* Fix example used in [`cargo_common_metadata`]
+ [#6293](https://github.com/rust-lang/rust-clippy/pull/6293)
+* Improve [`map_clone`] documentation
+ [#6340](https://github.com/rust-lang/rust-clippy/pull/6340)
+
+### Others
+
+* You can now tell Clippy about the MSRV your project supports. Please refer to
+ the specific README section to learn more about MSRV support [here][msrv_readme]
+ [#6201](https://github.com/rust-lang/rust-clippy/pull/6201)
+* Add `--no-deps` option to avoid running on path dependencies in workspaces
+ [#6188](https://github.com/rust-lang/rust-clippy/pull/6188)
+
+## Rust 1.49
+
+Released 2020-12-31
+
+[e636b88...b20d4c1](https://github.com/rust-lang/rust-clippy/compare/e636b88...b20d4c1)
+
+### New Lints
+
+* [`field_reassign_with_default`] [#5911](https://github.com/rust-lang/rust-clippy/pull/5911)
+* [`await_holding_refcell_ref`] [#6029](https://github.com/rust-lang/rust-clippy/pull/6029)
+* [`disallowed_methods`] [#6081](https://github.com/rust-lang/rust-clippy/pull/6081)
+* [`inline_asm_x86_att_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`inline_asm_x86_intel_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`from_iter_instead_of_collect`] [#6101](https://github.com/rust-lang/rust-clippy/pull/6101)
+* [`mut_mutex_lock`] [#6103](https://github.com/rust-lang/rust-clippy/pull/6103)
+* [`single_element_loop`] [#6109](https://github.com/rust-lang/rust-clippy/pull/6109)
+* [`manual_unwrap_or`] [#6123](https://github.com/rust-lang/rust-clippy/pull/6123)
+* [`large_types_passed_by_value`] [#6135](https://github.com/rust-lang/rust-clippy/pull/6135)
+* [`result_unit_err`] [#6157](https://github.com/rust-lang/rust-clippy/pull/6157)
+* [`ref_option_ref`] [#6165](https://github.com/rust-lang/rust-clippy/pull/6165)
+* [`manual_range_contains`] [#6177](https://github.com/rust-lang/rust-clippy/pull/6177)
+* [`unusual_byte_groupings`] [#6183](https://github.com/rust-lang/rust-clippy/pull/6183)
+* [`comparison_to_empty`] [#6226](https://github.com/rust-lang/rust-clippy/pull/6226)
+* [`map_collect_result_unit`] [#6227](https://github.com/rust-lang/rust-clippy/pull/6227)
+* [`manual_ok_or`] [#6233](https://github.com/rust-lang/rust-clippy/pull/6233)
+
+### Moves and Deprecations
+
+* Rename `single_char_push_str` to [`single_char_add_str`]
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* Rename `zero_width_space` to [`invisible_characters`]
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* Deprecate `drop_bounds` (uplifted)
+ [#6111](https://github.com/rust-lang/rust-clippy/pull/6111)
+* Move [`string_lit_as_bytes`] to `nursery`
+ [#6117](https://github.com/rust-lang/rust-clippy/pull/6117)
+* Move [`rc_buffer`] to `restriction`
+ [#6128](https://github.com/rust-lang/rust-clippy/pull/6128)
+
+### Enhancements
+
+* [`manual_memcpy`]: Also lint when there are loop counters (and produce a
+ reliable suggestion)
+ [#5727](https://github.com/rust-lang/rust-clippy/pull/5727)
+* [`single_char_add_str`]: Also lint on `String::insert_str`
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* [`invisible_characters`]: Also lint the characters `\u{AD}` and `\u{2060}`
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* [`eq_op`]: Also lint on the `assert_*!` macro family
+ [#6167](https://github.com/rust-lang/rust-clippy/pull/6167)
+* [`items_after_statements`]: Also lint in local macro expansions
+ [#6176](https://github.com/rust-lang/rust-clippy/pull/6176)
+* [`unnecessary_cast`]: Also lint casts on integer and float literals
+ [#6187](https://github.com/rust-lang/rust-clippy/pull/6187)
+* [`manual_unwrap_or`]: Also lint `Result::unwrap_or`
+ [#6190](https://github.com/rust-lang/rust-clippy/pull/6190)
+* [`match_like_matches_macro`]: Also lint when `match` has more than two arms
+ [#6216](https://github.com/rust-lang/rust-clippy/pull/6216)
+* [`integer_arithmetic`]: Better handle `/` an `%` operators
+ [#6229](https://github.com/rust-lang/rust-clippy/pull/6229)
+
+### False Positive Fixes
+
+* [`needless_lifetimes`]: Bail out if the function has a `where` clause with the
+ lifetime [#5978](https://github.com/rust-lang/rust-clippy/pull/5978)
+* [`explicit_counter_loop`]: No longer lints, when loop counter is used after it
+ is incremented [#6076](https://github.com/rust-lang/rust-clippy/pull/6076)
+* [`or_fun_call`]: Revert changes addressing the handling of `const fn`
+ [#6077](https://github.com/rust-lang/rust-clippy/pull/6077)
+* [`needless_range_loop`]: No longer lints, when the iterable is used in the
+ range [#6102](https://github.com/rust-lang/rust-clippy/pull/6102)
+* [`inconsistent_digit_grouping`]: Fix bug when using floating point exponent
+ [#6104](https://github.com/rust-lang/rust-clippy/pull/6104)
+* [`mistyped_literal_suffixes`]: No longer lints on the fractional part of a
+ float (e.g. `713.32_64`)
+ [#6114](https://github.com/rust-lang/rust-clippy/pull/6114)
+* [`invalid_regex`]: No longer lint on unicode characters within `bytes::Regex`
+ [#6132](https://github.com/rust-lang/rust-clippy/pull/6132)
+* [`boxed_local`]: No longer lints on `extern fn` arguments
+ [#6133](https://github.com/rust-lang/rust-clippy/pull/6133)
+* [`needless_lifetimes`]: Fix regression, where lifetime is used in `where`
+ clause [#6198](https://github.com/rust-lang/rust-clippy/pull/6198)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_sort_by`]: Avoid dereferencing the suggested closure parameter
+ [#6078](https://github.com/rust-lang/rust-clippy/pull/6078)
+* [`needless_arbitrary_self_type`]: Correctly handle expanded code
+ [#6093](https://github.com/rust-lang/rust-clippy/pull/6093)
+* [`useless_format`]: Preserve raw strings in suggestion
+ [#6151](https://github.com/rust-lang/rust-clippy/pull/6151)
+* [`empty_loop`]: Suggest alternatives
+ [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`borrowed_box`]: Correctly add parentheses in suggestion
+ [#6200](https://github.com/rust-lang/rust-clippy/pull/6200)
+* [`unused_unit`]: Improve suggestion formatting
+ [#6247](https://github.com/rust-lang/rust-clippy/pull/6247)
+
+### Documentation Improvements
+
+* Some doc improvements:
+ * [`rc_buffer`] [#6090](https://github.com/rust-lang/rust-clippy/pull/6090)
+ * [`empty_loop`] [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`doc_markdown`]: Document problematic link text style
+ [#6107](https://github.com/rust-lang/rust-clippy/pull/6107)
+
+## Rust 1.48
+
+Released 2020-11-19
+
+[09bd400...e636b88](https://github.com/rust-lang/rust-clippy/compare/09bd400...e636b88)
+
+### New lints
+
+* [`self_assignment`] [#5894](https://github.com/rust-lang/rust-clippy/pull/5894)
+* [`unnecessary_lazy_evaluations`] [#5720](https://github.com/rust-lang/rust-clippy/pull/5720)
+* [`manual_strip`] [#6038](https://github.com/rust-lang/rust-clippy/pull/6038)
+* [`map_err_ignore`] [#5998](https://github.com/rust-lang/rust-clippy/pull/5998)
+* [`rc_buffer`] [#6044](https://github.com/rust-lang/rust-clippy/pull/6044)
+* `to_string_in_display` [#5831](https://github.com/rust-lang/rust-clippy/pull/5831)
+* `single_char_push_str` [#5881](https://github.com/rust-lang/rust-clippy/pull/5881)
+
+### Moves and Deprecations
+
+* Downgrade [`verbose_bit_mask`] to pedantic
+ [#6036](https://github.com/rust-lang/rust-clippy/pull/6036)
+
+### Enhancements
+
+* Extend [`precedence`] to handle chains of methods combined with unary negation
+ [#5928](https://github.com/rust-lang/rust-clippy/pull/5928)
+* [`useless_vec`]: add a configuration value for the maximum allowed size on the stack
+ [#5907](https://github.com/rust-lang/rust-clippy/pull/5907)
+* [`suspicious_arithmetic_impl`]: extend to implementations of `BitAnd`, `BitOr`, `BitXor`, `Rem`, `Shl`, and `Shr`
+ [#5884](https://github.com/rust-lang/rust-clippy/pull/5884)
+* `invalid_atomic_ordering`: detect misuse of `compare_exchange`, `compare_exchange_weak`, and `fetch_update`
+ [#6025](https://github.com/rust-lang/rust-clippy/pull/6025)
+* Avoid [`redundant_pattern_matching`] triggering in macros
+ [#6069](https://github.com/rust-lang/rust-clippy/pull/6069)
+* [`option_if_let_else`]: distinguish pure from impure `else` expressions
+ [#5937](https://github.com/rust-lang/rust-clippy/pull/5937)
+* [`needless_doctest_main`]: parse doctests instead of using textual search
+ [#5912](https://github.com/rust-lang/rust-clippy/pull/5912)
+* [`wildcard_imports`]: allow `prelude` to appear in any segment of an import
+ [#5929](https://github.com/rust-lang/rust-clippy/pull/5929)
+* Re-enable [`len_zero`] for ranges now that `range_is_empty` is stable
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+* [`option_as_ref_deref`]: catch fully-qualified calls to `Deref::deref` and `DerefMut::deref_mut`
+ [#5933](https://github.com/rust-lang/rust-clippy/pull/5933)
+
+### False Positive Fixes
+
+* [`useless_attribute`]: permit allowing [`wildcard_imports`] and [`enum_glob_use`]
+ [#5994](https://github.com/rust-lang/rust-clippy/pull/5994)
+* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts
+ [#5999](https://github.com/rust-lang/rust-clippy/pull/5999)
+* [`redundant_closure_call`]: take into account usages of the closure in nested functions and closures
+ [#5920](https://github.com/rust-lang/rust-clippy/pull/5920)
+* Fix false positive in [`borrow_interior_mutable_const`] when referencing a field behind a pointer
+ [#5949](https://github.com/rust-lang/rust-clippy/pull/5949)
+* [`doc_markdown`]: allow using "GraphQL" without backticks
+ [#5996](https://github.com/rust-lang/rust-clippy/pull/5996)
+* `to_string_in_display`: avoid linting when calling `to_string()` on anything that is not `self`
+ [#5971](https://github.com/rust-lang/rust-clippy/pull/5971)
+* [`indexing_slicing`] and [`out_of_bounds_indexing`] treat references to arrays as arrays
+ [#6034](https://github.com/rust-lang/rust-clippy/pull/6034)
+* [`should_implement_trait`]: ignore methods with lifetime parameters
+ [#5725](https://github.com/rust-lang/rust-clippy/pull/5725)
+* [`needless_return`]: avoid linting if a temporary borrows a local variable
+ [#5903](https://github.com/rust-lang/rust-clippy/pull/5903)
+* Restrict [`unnecessary_sort_by`] to non-reference, Copy types
+ [#6006](https://github.com/rust-lang/rust-clippy/pull/6006)
+* Avoid suggesting `from_bits`/`to_bits` in const contexts in [`transmute_int_to_float`]
+ [#5919](https://github.com/rust-lang/rust-clippy/pull/5919)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]: improve detection of interior mutable types
+ [#6046](https://github.com/rust-lang/rust-clippy/pull/6046)
+
+### Suggestion Fixes/Improvements
+
+* [`let_and_return`]: add a cast to the suggestion when the return expression has adjustments
+ [#5946](https://github.com/rust-lang/rust-clippy/pull/5946)
+* [`useless_conversion`]: show the type in the error message
+ [#6035](https://github.com/rust-lang/rust-clippy/pull/6035)
+* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message
+ [#5892](https://github.com/rust-lang/rust-clippy/pull/5892)
+* [`float_cmp`] and [`float_cmp_const`]: change wording to make margin of error less ambiguous
+ [#6043](https://github.com/rust-lang/rust-clippy/pull/6043)
+* [`default_trait_access`]: do not use unnecessary type parameters in the suggestion
+ [#5993](https://github.com/rust-lang/rust-clippy/pull/5993)
+* [`collapsible_if`]: don't use expanded code in the suggestion
+ [#5992](https://github.com/rust-lang/rust-clippy/pull/5992)
+* Do not suggest empty format strings in [`print_with_newline`] and [`write_with_newline`]
+ [#6042](https://github.com/rust-lang/rust-clippy/pull/6042)
+* [`unit_arg`]: improve the readability of the suggestion
+ [#5931](https://github.com/rust-lang/rust-clippy/pull/5931)
+* [`stable_sort_primitive`]: print the type that is being sorted in the lint message
+ [#5935](https://github.com/rust-lang/rust-clippy/pull/5935)
+* Show line count and max lines in [`too_many_lines`] lint message
+ [#6009](https://github.com/rust-lang/rust-clippy/pull/6009)
+* Keep parentheses in the suggestion of [`useless_conversion`] where applicable
+ [#5900](https://github.com/rust-lang/rust-clippy/pull/5900)
+* [`option_map_unit_fn`] and [`result_map_unit_fn`]: print the unit type `()` explicitly
+ [#6024](https://github.com/rust-lang/rust-clippy/pull/6024)
+* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>`
+ [#5899](https://github.com/rust-lang/rust-clippy/pull/5899)
+* Make lint messages adhere to rustc dev guide conventions
+ [#5893](https://github.com/rust-lang/rust-clippy/pull/5893)
+
+### ICE Fixes
+
+* Fix ICE in [`repeat_once`]
+ [#5948](https://github.com/rust-lang/rust-clippy/pull/5948)
+
+### Documentation Improvements
+
+* [`mutable_key_type`]: explain potential for false positives when the interior mutable type is not accessed in the `Hash` implementation
+ [#6019](https://github.com/rust-lang/rust-clippy/pull/6019)
+* [`unnecessary_mut_passed`]: fix typo
+ [#5913](https://github.com/rust-lang/rust-clippy/pull/5913)
+* Add example of false positive to [`ptr_arg`] docs.
+ [#5885](https://github.com/rust-lang/rust-clippy/pull/5885)
+* [`box_vec`](https://rust-lang.github.io/rust-clippy/master/index.html#box_collection), [`vec_box`] and [`borrowed_box`]: add link to the documentation of `Box`
+ [#6023](https://github.com/rust-lang/rust-clippy/pull/6023)
+
+## Rust 1.47
+
+Released 2020-10-08
+
+[c2c07fa...09bd400](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...09bd400)
+
+### New lints
+
+* [`derive_ord_xor_partial_ord`] [#5848](https://github.com/rust-lang/rust-clippy/pull/5848)
+* [`trait_duplication_in_bounds`] [#5852](https://github.com/rust-lang/rust-clippy/pull/5852)
+* [`map_identity`] [#5694](https://github.com/rust-lang/rust-clippy/pull/5694)
+* [`unit_return_expecting_ord`] [#5737](https://github.com/rust-lang/rust-clippy/pull/5737)
+* [`pattern_type_mismatch`] [#4841](https://github.com/rust-lang/rust-clippy/pull/4841)
+* [`repeat_once`] [#5773](https://github.com/rust-lang/rust-clippy/pull/5773)
+* [`same_item_push`] [#5825](https://github.com/rust-lang/rust-clippy/pull/5825)
+* [`needless_arbitrary_self_type`] [#5869](https://github.com/rust-lang/rust-clippy/pull/5869)
+* [`match_like_matches_macro`] [#5769](https://github.com/rust-lang/rust-clippy/pull/5769)
+* [`stable_sort_primitive`] [#5809](https://github.com/rust-lang/rust-clippy/pull/5809)
+* [`blanket_clippy_restriction_lints`] [#5750](https://github.com/rust-lang/rust-clippy/pull/5750)
+* [`option_if_let_else`] [#5301](https://github.com/rust-lang/rust-clippy/pull/5301)
+
+### Moves and Deprecations
+
+* Deprecate [`regex_macro`] lint
+ [#5760](https://github.com/rust-lang/rust-clippy/pull/5760)
+* Move [`range_minus_one`] to `pedantic`
+ [#5752](https://github.com/rust-lang/rust-clippy/pull/5752)
+
+### Enhancements
+
+* Improve [`needless_collect`] by catching `collect` calls followed by `iter` or `into_iter` calls
+ [#5837](https://github.com/rust-lang/rust-clippy/pull/5837)
+* [`panic`], [`todo`], [`unimplemented`] and [`unreachable`] now detect calls with formatting
+ [#5811](https://github.com/rust-lang/rust-clippy/pull/5811)
+* Detect more cases of [`suboptimal_flops`] and [`imprecise_flops`]
+ [#5443](https://github.com/rust-lang/rust-clippy/pull/5443)
+* Handle asymmetrical implementations of `PartialEq` in [`cmp_owned`]
+ [#5701](https://github.com/rust-lang/rust-clippy/pull/5701)
+* Make it possible to allow [`unsafe_derive_deserialize`]
+ [#5870](https://github.com/rust-lang/rust-clippy/pull/5870)
+* Catch `ord.min(a).max(b)` where a < b in [`min_max`]
+ [#5871](https://github.com/rust-lang/rust-clippy/pull/5871)
+* Make [`clone_on_copy`] suggestion machine applicable
+ [#5745](https://github.com/rust-lang/rust-clippy/pull/5745)
+* Enable [`len_zero`] on ranges now that `is_empty` is stable on them
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+
+### False Positive Fixes
+
+* Avoid triggering [`or_fun_call`] with const fns that take no arguments
+ [#5889](https://github.com/rust-lang/rust-clippy/pull/5889)
+* Fix [`redundant_closure_call`] false positive for closures that have multiple calls
+ [#5800](https://github.com/rust-lang/rust-clippy/pull/5800)
+* Don't lint cases involving `ManuallyDrop` in [`redundant_clone`]
+ [#5824](https://github.com/rust-lang/rust-clippy/pull/5824)
+* Treat a single expression the same as a single statement in the 2nd arm of a match in [`single_match_else`]
+ [#5771](https://github.com/rust-lang/rust-clippy/pull/5771)
+* Don't trigger [`unnested_or_patterns`] if the feature `or_patterns` is not enabled
+ [#5758](https://github.com/rust-lang/rust-clippy/pull/5758)
+* Avoid linting if key borrows in [`unnecessary_sort_by`]
+ [#5756](https://github.com/rust-lang/rust-clippy/pull/5756)
+* Consider `Try` impl for `Poll` when generating suggestions in [`try_err`]
+ [#5857](https://github.com/rust-lang/rust-clippy/pull/5857)
+* Take input lifetimes into account in `manual_async_fn`
+ [#5859](https://github.com/rust-lang/rust-clippy/pull/5859)
+* Fix multiple false positives in [`type_repetition_in_bounds`] and add a configuration option
+ [#5761](https://github.com/rust-lang/rust-clippy/pull/5761)
+* Limit the [`suspicious_arithmetic_impl`] lint to one binary operation
+ [#5820](https://github.com/rust-lang/rust-clippy/pull/5820)
+
+### Suggestion Fixes/Improvements
+
+* Improve readability of [`shadow_unrelated`] suggestion by truncating the RHS snippet
+ [#5788](https://github.com/rust-lang/rust-clippy/pull/5788)
+* Suggest `filter_map` instead of `flat_map` when mapping to `Option` in [`map_flatten`]
+ [#5846](https://github.com/rust-lang/rust-clippy/pull/5846)
+* Ensure suggestion is shown correctly for long method call chains in [`iter_nth_zero`]
+ [#5793](https://github.com/rust-lang/rust-clippy/pull/5793)
+* Drop borrow operator in suggestions of [`redundant_pattern_matching`]
+ [#5815](https://github.com/rust-lang/rust-clippy/pull/5815)
+* Add suggestion for [`iter_skip_next`]
+ [#5843](https://github.com/rust-lang/rust-clippy/pull/5843)
+* Improve [`collapsible_if`] fix suggestion
+ [#5732](https://github.com/rust-lang/rust-clippy/pull/5732)
+
+### ICE Fixes
+
+* Fix ICE caused by [`needless_collect`]
+ [#5877](https://github.com/rust-lang/rust-clippy/pull/5877)
+* Fix ICE caused by [`unnested_or_patterns`]
+ [#5784](https://github.com/rust-lang/rust-clippy/pull/5784)
+
+### Documentation Improvements
+
+* Fix grammar of [`await_holding_lock`] documentation
+ [#5748](https://github.com/rust-lang/rust-clippy/pull/5748)
+
+### Others
+
+* Make lints adhere to the rustc dev guide
+ [#5888](https://github.com/rust-lang/rust-clippy/pull/5888)
+
+## Rust 1.46
+
+Released 2020-08-27
+
+[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...c2c07fa)
+
+### New lints
+
+* [`unnested_or_patterns`] [#5378](https://github.com/rust-lang/rust-clippy/pull/5378)
+* [`iter_next_slice`] [#5597](https://github.com/rust-lang/rust-clippy/pull/5597)
+* [`unnecessary_sort_by`] [#5623](https://github.com/rust-lang/rust-clippy/pull/5623)
+* [`vec_resize_to_zero`] [#5637](https://github.com/rust-lang/rust-clippy/pull/5637)
+
+### Moves and Deprecations
+
+* Move [`cast_ptr_alignment`] to pedantic [#5667](https://github.com/rust-lang/rust-clippy/pull/5667)
+
+### Enhancements
+
+* Improve [`mem_replace_with_uninit`] lint [#5695](https://github.com/rust-lang/rust-clippy/pull/5695)
+
+### False Positive Fixes
+
+* [`len_zero`]: Avoid linting ranges when the `range_is_empty` feature is not enabled
+ [#5656](https://github.com/rust-lang/rust-clippy/pull/5656)
+* [`let_and_return`]: Don't lint if a temporary borrow is involved
+ [#5680](https://github.com/rust-lang/rust-clippy/pull/5680)
+* [`reversed_empty_ranges`]: Avoid linting `N..N` in for loop arguments in
+ [#5692](https://github.com/rust-lang/rust-clippy/pull/5692)
+* [`if_same_then_else`]: Don't assume multiplication is always commutative
+ [#5702](https://github.com/rust-lang/rust-clippy/pull/5702)
++* [`disallowed_names`]: Remove `bar` from the default configuration
+ [#5712](https://github.com/rust-lang/rust-clippy/pull/5712)
+* [`redundant_pattern_matching`]: Avoid suggesting non-`const fn` calls in const contexts
+ [#5724](https://github.com/rust-lang/rust-clippy/pull/5724)
+
+### Suggestion Fixes/Improvements
+
+* Fix suggestion of [`unit_arg`] lint, so that it suggest semantic equivalent code
+ [#4455](https://github.com/rust-lang/rust-clippy/pull/4455)
+* Add auto applicable suggestion to [`macro_use_imports`]
+ [#5279](https://github.com/rust-lang/rust-clippy/pull/5279)
+
+### ICE Fixes
+
+* Fix ICE in the `consts` module of Clippy [#5709](https://github.com/rust-lang/rust-clippy/pull/5709)
+
+### Documentation Improvements
+
+* Improve code examples across multiple lints [#5664](https://github.com/rust-lang/rust-clippy/pull/5664)
+
+### Others
+
+* Introduce a `--rustc` flag to `clippy-driver`, which turns `clippy-driver`
+ into `rustc` and passes all the given arguments to `rustc`. This is especially
+ useful for tools that need the `rustc` version Clippy was compiled with,
+ instead of the Clippy version. E.g. `clippy-driver --rustc --version` will
+ print the output of `rustc --version`.
+ [#5178](https://github.com/rust-lang/rust-clippy/pull/5178)
+* New issue templates now make it easier to complain if Clippy is too annoying
+ or not annoying enough! [#5735](https://github.com/rust-lang/rust-clippy/pull/5735)
+
+## Rust 1.45
+
+Released 2020-07-16
+
+[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)
+
+### New lints
+
+* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
+* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
+* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
+* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
+* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
+* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
+* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
+* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
+* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)
+
+### Moves and Deprecations
+
+* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
+* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
+* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
+* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
+* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
+* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+
+### Enhancements
+
+* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
+* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
+* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
+* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)
+
+### False Positive Fixes
+
+* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
+* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
+* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
+* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
+* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
+* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
+* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
+* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
+* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
+* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
+* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
+* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
+and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
+* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)
+
+### Suggestion Improvements
+
+* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
+* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
+* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
+* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)
+
+### ICE Fixes
+
+* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
+* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)
+
+### Documentation
+
+* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
+* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)
+
+## Rust 1.44
+
+Released 2020-06-04
+
+[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)
+
+### New lints
+
+* [`explicit_deref_methods`] [#5226](https://github.com/rust-lang/rust-clippy/pull/5226)
+* [`implicit_saturating_sub`] [#5427](https://github.com/rust-lang/rust-clippy/pull/5427)
+* [`macro_use_imports`] [#5230](https://github.com/rust-lang/rust-clippy/pull/5230)
+* [`verbose_file_reads`] [#5272](https://github.com/rust-lang/rust-clippy/pull/5272)
+* [`future_not_send`] [#5423](https://github.com/rust-lang/rust-clippy/pull/5423)
+* [`redundant_pub_crate`] [#5319](https://github.com/rust-lang/rust-clippy/pull/5319)
+* [`large_const_arrays`] [#5248](https://github.com/rust-lang/rust-clippy/pull/5248)
+* [`result_map_or_into_option`] [#5415](https://github.com/rust-lang/rust-clippy/pull/5415)
+* [`redundant_allocation`] [#5349](https://github.com/rust-lang/rust-clippy/pull/5349)
+* [`fn_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+* [`vtable_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+
+
+### Moves and Deprecations
+
+* Deprecate [`replace_consts`] lint [#5380](https://github.com/rust-lang/rust-clippy/pull/5380)
+* Move [`cognitive_complexity`] to nursery [#5428](https://github.com/rust-lang/rust-clippy/pull/5428)
+* Move [`useless_transmute`] to nursery [#5364](https://github.com/rust-lang/rust-clippy/pull/5364)
+* Downgrade [`inefficient_to_string`] to pedantic [#5412](https://github.com/rust-lang/rust-clippy/pull/5412)
+* Downgrade [`option_option`] to pedantic [#5401](https://github.com/rust-lang/rust-clippy/pull/5401)
+* Downgrade [`unreadable_literal`] to pedantic [#5419](https://github.com/rust-lang/rust-clippy/pull/5419)
+* Downgrade [`let_unit_value`] to pedantic [#5409](https://github.com/rust-lang/rust-clippy/pull/5409)
+* Downgrade [`trivially_copy_pass_by_ref`] to pedantic [#5410](https://github.com/rust-lang/rust-clippy/pull/5410)
+* Downgrade [`implicit_hasher`] to pedantic [#5411](https://github.com/rust-lang/rust-clippy/pull/5411)
+
+### Enhancements
+
+* On _nightly_ you can now use `cargo clippy --fix -Z unstable-options` to
+ auto-fix lints that support this [#5363](https://github.com/rust-lang/rust-clippy/pull/5363)
+* Make [`redundant_clone`] also trigger on cases where the cloned value is not
+ consumed. [#5304](https://github.com/rust-lang/rust-clippy/pull/5304)
+* Expand [`integer_arithmetic`] to also disallow bit-shifting [#5430](https://github.com/rust-lang/rust-clippy/pull/5430)
+* [`option_as_ref_deref`] now detects more deref cases [#5425](https://github.com/rust-lang/rust-clippy/pull/5425)
+* [`large_enum_variant`] now report the sizes of the largest and second-largest variants [#5466](https://github.com/rust-lang/rust-clippy/pull/5466)
+* [`bool_comparison`] now also checks for inequality comparisons that can be
+ written more concisely [#5365](https://github.com/rust-lang/rust-clippy/pull/5365)
+* Expand [`clone_on_copy`] to work in method call arguments as well [#5441](https://github.com/rust-lang/rust-clippy/pull/5441)
+* [`redundant_pattern_matching`] now also handles `while let` [#5483](https://github.com/rust-lang/rust-clippy/pull/5483)
+* [`integer_arithmetic`] now also lints references of integers [#5329](https://github.com/rust-lang/rust-clippy/pull/5329)
+* Expand [`float_cmp_const`] to also work on arrays [#5345](https://github.com/rust-lang/rust-clippy/pull/5345)
+* Trigger [`map_flatten`] when map is called on an `Option` [#5473](https://github.com/rust-lang/rust-clippy/pull/5473)
+
+### False Positive Fixes
+
+* [`many_single_char_names`] [#5468](https://github.com/rust-lang/rust-clippy/pull/5468)
+* [`should_implement_trait`] [#5437](https://github.com/rust-lang/rust-clippy/pull/5437)
+* [`unused_self`] [#5387](https://github.com/rust-lang/rust-clippy/pull/5387)
+* [`redundant_clone`] [#5453](https://github.com/rust-lang/rust-clippy/pull/5453)
+* [`precedence`] [#5445](https://github.com/rust-lang/rust-clippy/pull/5445)
+* [`suspicious_op_assign_impl`] [#5424](https://github.com/rust-lang/rust-clippy/pull/5424)
+* [`needless_lifetimes`] [#5293](https://github.com/rust-lang/rust-clippy/pull/5293)
+* [`redundant_pattern`] [#5287](https://github.com/rust-lang/rust-clippy/pull/5287)
+* [`inconsistent_digit_grouping`] [#5451](https://github.com/rust-lang/rust-clippy/pull/5451)
+
+
+### Suggestion Improvements
+
+* Improved [`question_mark`] lint suggestion so that it doesn't add redundant `as_ref()` [#5481](https://github.com/rust-lang/rust-clippy/pull/5481)
+* Improve the suggested placeholder in [`option_map_unit_fn`] [#5292](https://github.com/rust-lang/rust-clippy/pull/5292)
+* Improve suggestion for [`match_single_binding`] when triggered inside a closure [#5350](https://github.com/rust-lang/rust-clippy/pull/5350)
+
+### ICE Fixes
+
+* Handle the unstable `trivial_bounds` feature [#5296](https://github.com/rust-lang/rust-clippy/pull/5296)
+* `shadow_*` lints [#5297](https://github.com/rust-lang/rust-clippy/pull/5297)
+
+### Documentation
+
+* Fix documentation generation for configurable lints [#5353](https://github.com/rust-lang/rust-clippy/pull/5353)
+* Update documentation for [`new_ret_no_self`] [#5448](https://github.com/rust-lang/rust-clippy/pull/5448)
+* The documentation for [`option_option`] now suggest using a tri-state enum [#5403](https://github.com/rust-lang/rust-clippy/pull/5403)
+* Fix bit mask example in [`verbose_bit_mask`] documentation [#5454](https://github.com/rust-lang/rust-clippy/pull/5454)
+* [`wildcard_imports`] documentation now mentions that `use ...::prelude::*` is
+ not linted [#5312](https://github.com/rust-lang/rust-clippy/pull/5312)
+
+## Rust 1.43
+
+Released 2020-04-23
+
+[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)
+
+### New lints
+
+* [`imprecise_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`suboptimal_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`wildcard_imports`] [#5029](https://github.com/rust-lang/rust-clippy/pull/5029)
+* [`single_component_path_imports`] [#5058](https://github.com/rust-lang/rust-clippy/pull/5058)
+* [`match_single_binding`] [#5061](https://github.com/rust-lang/rust-clippy/pull/5061)
+* [`let_underscore_lock`] [#5101](https://github.com/rust-lang/rust-clippy/pull/5101)
+* [`struct_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`fn_params_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`option_env_unwrap`] [#5148](https://github.com/rust-lang/rust-clippy/pull/5148)
+* [`lossy_float_literal`] [#5202](https://github.com/rust-lang/rust-clippy/pull/5202)
+* [`rest_pat_in_fully_bound_structs`] [#5258](https://github.com/rust-lang/rust-clippy/pull/5258)
+
+### Moves and Deprecations
+
+* Move [`unneeded_field_pattern`] to pedantic group [#5200](https://github.com/rust-lang/rust-clippy/pull/5200)
+
+### Enhancements
+
+* Make [`missing_errors_doc`] lint also trigger on `async` functions
+ [#5181](https://github.com/rust-lang/rust-clippy/pull/5181)
+* Add more constants to [`approx_constant`] [#5193](https://github.com/rust-lang/rust-clippy/pull/5193)
+* Extend [`question_mark`] lint [#5266](https://github.com/rust-lang/rust-clippy/pull/5266)
+
+### False Positive Fixes
+
+* [`use_debug`] [#5047](https://github.com/rust-lang/rust-clippy/pull/5047)
+* [`unnecessary_unwrap`] [#5132](https://github.com/rust-lang/rust-clippy/pull/5132)
+* [`zero_prefixed_literal`] [#5170](https://github.com/rust-lang/rust-clippy/pull/5170)
+* [`missing_const_for_fn`] [#5216](https://github.com/rust-lang/rust-clippy/pull/5216)
+
+### Suggestion Improvements
+
+* Improve suggestion when blocks of code are suggested [#5134](https://github.com/rust-lang/rust-clippy/pull/5134)
+
+### ICE Fixes
+
+* `misc_early` lints [#5129](https://github.com/rust-lang/rust-clippy/pull/5129)
+* [`missing_errors_doc`] [#5213](https://github.com/rust-lang/rust-clippy/pull/5213)
+* Fix ICE when evaluating `usize`s [#5256](https://github.com/rust-lang/rust-clippy/pull/5256)
+
+### Documentation
+
+* Improve documentation of [`iter_nth_zero`]
+* Add documentation pages for stable releases [#5171](https://github.com/rust-lang/rust-clippy/pull/5171)
+
+### Others
+
+* Clippy now completely runs on GitHub Actions [#5190](https://github.com/rust-lang/rust-clippy/pull/5190)
+
+
+## Rust 1.42
+
+Released 2020-03-12
+
+[69f99e7...4ee1206](https://github.com/rust-lang/rust-clippy/compare/69f99e7...4ee1206)
+
+### New lints
+
+* [`filetype_is_file`] [#4543](https://github.com/rust-lang/rust-clippy/pull/4543)
+* [`let_underscore_must_use`] [#4823](https://github.com/rust-lang/rust-clippy/pull/4823)
+* [`modulo_arithmetic`] [#4867](https://github.com/rust-lang/rust-clippy/pull/4867)
+* [`mem_replace_with_default`] [#4881](https://github.com/rust-lang/rust-clippy/pull/4881)
+* [`mutable_key_type`] [#4885](https://github.com/rust-lang/rust-clippy/pull/4885)
+* [`option_as_ref_deref`] [#4945](https://github.com/rust-lang/rust-clippy/pull/4945)
+* [`wildcard_in_or_patterns`] [#4960](https://github.com/rust-lang/rust-clippy/pull/4960)
+* [`iter_nth_zero`] [#4966](https://github.com/rust-lang/rust-clippy/pull/4966)
+* `invalid_atomic_ordering` [#4999](https://github.com/rust-lang/rust-clippy/pull/4999)
+* [`skip_while_next`] [#5067](https://github.com/rust-lang/rust-clippy/pull/5067)
+
+### Moves and Deprecations
+
+* Move [`transmute_float_to_int`] from nursery to complexity group
+ [#5015](https://github.com/rust-lang/rust-clippy/pull/5015)
+* Move [`range_plus_one`] to pedantic group [#5057](https://github.com/rust-lang/rust-clippy/pull/5057)
+* Move [`debug_assert_with_mut_call`] to nursery group [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Deprecate `unused_label` [#4930](https://github.com/rust-lang/rust-clippy/pull/4930)
+
+### Enhancements
+
+* Lint vectored IO in [`unused_io_amount`] [#5027](https://github.com/rust-lang/rust-clippy/pull/5027)
+* Make [`vec_box`] configurable by adding a size threshold [#5081](https://github.com/rust-lang/rust-clippy/pull/5081)
+* Also lint constants in [`cmp_nan`] [#4910](https://github.com/rust-lang/rust-clippy/pull/4910)
+* Fix false negative in [`expect_fun_call`] [#4915](https://github.com/rust-lang/rust-clippy/pull/4915)
+* Fix false negative in [`redundant_clone`] [#5017](https://github.com/rust-lang/rust-clippy/pull/5017)
+
+### False Positive Fixes
+
+* [`map_clone`] [#4937](https://github.com/rust-lang/rust-clippy/pull/4937)
+* [`replace_consts`] [#4977](https://github.com/rust-lang/rust-clippy/pull/4977)
+* [`let_and_return`] [#5008](https://github.com/rust-lang/rust-clippy/pull/5008)
+* [`eq_op`] [#5079](https://github.com/rust-lang/rust-clippy/pull/5079)
+* [`possible_missing_comma`] [#5083](https://github.com/rust-lang/rust-clippy/pull/5083)
+* [`debug_assert_with_mut_call`] [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Don't trigger [`let_underscore_must_use`] in external macros
+ [#5082](https://github.com/rust-lang/rust-clippy/pull/5082)
+* Don't trigger [`empty_loop`] in `no_std` crates [#5086](https://github.com/rust-lang/rust-clippy/pull/5086)
+
+### Suggestion Improvements
+
+* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634)
+* [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934)
+* [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935)
+* [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956)
+* `unknown_clippy_lints` [#4963](https://github.com/rust-lang/rust-clippy/pull/4963)
+* [`explicit_into_iter_loop`] [#4978](https://github.com/rust-lang/rust-clippy/pull/4978)
+* [`useless_attribute`] [#5022](https://github.com/rust-lang/rust-clippy/pull/5022)
+* `if_let_some_result` [#5032](https://github.com/rust-lang/rust-clippy/pull/5032)
+
+### ICE fixes
+
+* [`unsound_collection_transmute`] [#4975](https://github.com/rust-lang/rust-clippy/pull/4975)
+
+### Documentation
+
+* Improve documentation of [`empty_enum`], [`replace_consts`], [`redundant_clone`], and [`iterator_step_by_zero`]
+
+
+## Rust 1.41
+
+Released 2020-01-30
+
+[c8e3cfb...69f99e7](https://github.com/rust-lang/rust-clippy/compare/c8e3cfb...69f99e7)
+
+* New Lints:
+ * [`exit`] [#4697](https://github.com/rust-lang/rust-clippy/pull/4697)
+ * [`to_digit_is_some`] [#4801](https://github.com/rust-lang/rust-clippy/pull/4801)
+ * [`tabs_in_doc_comments`] [#4806](https://github.com/rust-lang/rust-clippy/pull/4806)
+ * [`large_stack_arrays`] [#4807](https://github.com/rust-lang/rust-clippy/pull/4807)
+ * [`same_functions_in_if_condition`] [#4814](https://github.com/rust-lang/rust-clippy/pull/4814)
+ * [`zst_offset`] [#4816](https://github.com/rust-lang/rust-clippy/pull/4816)
+ * [`as_conversions`] [#4821](https://github.com/rust-lang/rust-clippy/pull/4821)
+ * [`missing_errors_doc`] [#4884](https://github.com/rust-lang/rust-clippy/pull/4884)
+ * [`transmute_float_to_int`] [#4889](https://github.com/rust-lang/rust-clippy/pull/4889)
+* Remove plugin interface, see
+ [Inside Rust Blog](https://blog.rust-lang.org/inside-rust/2019/11/04/Clippy-removes-plugin-interface.html) for
+ details [#4714](https://github.com/rust-lang/rust-clippy/pull/4714)
+* Move [`use_self`] to nursery group [#4863](https://github.com/rust-lang/rust-clippy/pull/4863)
+* Deprecate `into_iter_on_array` [#4788](https://github.com/rust-lang/rust-clippy/pull/4788)
+* Expand [`string_lit_as_bytes`] to also trigger when literal has escapes
+ [#4808](https://github.com/rust-lang/rust-clippy/pull/4808)
+* Fix false positive in `comparison_chain` [#4842](https://github.com/rust-lang/rust-clippy/pull/4842)
+* Fix false positive in `while_immutable_condition` [#4730](https://github.com/rust-lang/rust-clippy/pull/4730)
+* Fix false positive in `explicit_counter_loop` [#4803](https://github.com/rust-lang/rust-clippy/pull/4803)
+* Fix false positive in `must_use_candidate` [#4794](https://github.com/rust-lang/rust-clippy/pull/4794)
+* Fix false positive in `print_with_newline` and `write_with_newline`
+ [#4769](https://github.com/rust-lang/rust-clippy/pull/4769)
+* Fix false positive in `derive_hash_xor_eq` [#4766](https://github.com/rust-lang/rust-clippy/pull/4766)
+* Fix false positive in `missing_inline_in_public_items` [#4870](https://github.com/rust-lang/rust-clippy/pull/4870)
+* Fix false positive in `string_add` [#4880](https://github.com/rust-lang/rust-clippy/pull/4880)
+* Fix false positive in `float_arithmetic` [#4851](https://github.com/rust-lang/rust-clippy/pull/4851)
+* Fix false positive in `cast_sign_loss` [#4883](https://github.com/rust-lang/rust-clippy/pull/4883)
+* Fix false positive in `manual_swap` [#4877](https://github.com/rust-lang/rust-clippy/pull/4877)
+* Fix ICEs occurring while checking some block expressions [#4772](https://github.com/rust-lang/rust-clippy/pull/4772)
+* Fix ICE in `use_self` [#4776](https://github.com/rust-lang/rust-clippy/pull/4776)
+* Fix ICEs related to `const_generics` [#4780](https://github.com/rust-lang/rust-clippy/pull/4780)
+* Display help when running `clippy-driver` without arguments, instead of ICEing
+ [#4810](https://github.com/rust-lang/rust-clippy/pull/4810)
+* Clippy has its own ICE message now [#4588](https://github.com/rust-lang/rust-clippy/pull/4588)
+* Show deprecated lints in the documentation again [#4757](https://github.com/rust-lang/rust-clippy/pull/4757)
+* Improve Documentation by adding positive examples to some lints
+ [#4832](https://github.com/rust-lang/rust-clippy/pull/4832)
+
+## Rust 1.40
+
+Released 2019-12-19
+
+[4e7e71b...c8e3cfb](https://github.com/rust-lang/rust-clippy/compare/4e7e71b...c8e3cfb)
+
+* New Lints:
+ * [`unneeded_wildcard_pattern`] [#4537](https://github.com/rust-lang/rust-clippy/pull/4537)
+ * [`needless_doctest_main`] [#4603](https://github.com/rust-lang/rust-clippy/pull/4603)
+ * [`suspicious_unary_op_formatting`] [#4615](https://github.com/rust-lang/rust-clippy/pull/4615)
+ * [`debug_assert_with_mut_call`] [#4680](https://github.com/rust-lang/rust-clippy/pull/4680)
+ * [`unused_self`] [#4619](https://github.com/rust-lang/rust-clippy/pull/4619)
+ * [`inefficient_to_string`] [#4683](https://github.com/rust-lang/rust-clippy/pull/4683)
+ * [`must_use_unit`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`must_use_candidate`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`double_must_use`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`comparison_chain`] [#4569](https://github.com/rust-lang/rust-clippy/pull/4569)
+ * [`unsound_collection_transmute`] [#4592](https://github.com/rust-lang/rust-clippy/pull/4592)
+ * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+* Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736)
+* Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613)
+* Expand `integer_arithmetic` to also detect mutating arithmetic like `+=` [#4585](https://github.com/rust-lang/rust-clippy/pull/4585)
+* Fix false positive in `nonminimal_bool` [#4568](https://github.com/rust-lang/rust-clippy/pull/4568)
+* Fix false positive in `missing_safety_doc` [#4611](https://github.com/rust-lang/rust-clippy/pull/4611)
+* Fix false positive in `cast_sign_loss` [#4614](https://github.com/rust-lang/rust-clippy/pull/4614)
+* Fix false positive in `redundant_clone` [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Fix false positive in `try_err` [#4721](https://github.com/rust-lang/rust-clippy/pull/4721)
+* Fix false positive in `toplevel_ref_arg` [#4570](https://github.com/rust-lang/rust-clippy/pull/4570)
+* Fix false positive in `multiple_inherent_impl` [#4593](https://github.com/rust-lang/rust-clippy/pull/4593)
+* Improve more suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4575](https://github.com/rust-lang/rust-clippy/pull/4575)
+* Improve suggestion for `zero_ptr` [#4599](https://github.com/rust-lang/rust-clippy/pull/4599)
+* Improve suggestion for `explicit_counter_loop` [#4691](https://github.com/rust-lang/rust-clippy/pull/4691)
+* Improve suggestion for `mul_add` [#4602](https://github.com/rust-lang/rust-clippy/pull/4602)
+* Improve suggestion for `assertions_on_constants` [#4635](https://github.com/rust-lang/rust-clippy/pull/4635)
+* Fix ICE in `use_self` [#4671](https://github.com/rust-lang/rust-clippy/pull/4671)
+* Fix ICE when encountering const casts [#4590](https://github.com/rust-lang/rust-clippy/pull/4590)
+
+## Rust 1.39
+
+Released 2019-11-07
+
+[3aea860...4e7e71b](https://github.com/rust-lang/rust-clippy/compare/3aea860...4e7e71b)
+
+* New Lints:
+ * [`uninit_assumed_init`] [#4479](https://github.com/rust-lang/rust-clippy/pull/4479)
+ * [`flat_map_identity`] [#4231](https://github.com/rust-lang/rust-clippy/pull/4231)
+ * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
+ * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
+ * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
+ * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
+ * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
+* Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
+* Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
+* Move `cast_lossless` to pedantic group [#4539](https://github.com/rust-lang/rust-clippy/pull/4539)
+* `temporary_cstring_as_ptr` now catches more cases [#4425](https://github.com/rust-lang/rust-clippy/pull/4425)
+* `use_self` now works in constructors, too [#4525](https://github.com/rust-lang/rust-clippy/pull/4525)
+* `cargo_common_metadata` now checks for license files [#4518](https://github.com/rust-lang/rust-clippy/pull/4518)
+* `cognitive_complexity` now includes the measured complexity in the warning message [#4469](https://github.com/rust-lang/rust-clippy/pull/4469)
+* Fix false positives in `block_in_if_*` lints [#4458](https://github.com/rust-lang/rust-clippy/pull/4458)
+* Fix false positive in `cast_lossless` [#4473](https://github.com/rust-lang/rust-clippy/pull/4473)
+* Fix false positive in `clone_on_copy` [#4411](https://github.com/rust-lang/rust-clippy/pull/4411)
+* Fix false positive in `deref_addrof` [#4487](https://github.com/rust-lang/rust-clippy/pull/4487)
+* Fix false positive in `too_many_lines` [#4490](https://github.com/rust-lang/rust-clippy/pull/4490)
+* Fix false positive in `new_ret_no_self` [#4365](https://github.com/rust-lang/rust-clippy/pull/4365)
+* Fix false positive in `manual_swap` [#4478](https://github.com/rust-lang/rust-clippy/pull/4478)
+* Fix false positive in `missing_const_for_fn` [#4450](https://github.com/rust-lang/rust-clippy/pull/4450)
+* Fix false positive in `extra_unused_lifetimes` [#4477](https://github.com/rust-lang/rust-clippy/pull/4477)
+* Fix false positive in `inherent_to_string` [#4460](https://github.com/rust-lang/rust-clippy/pull/4460)
+* Fix false positive in `map_entry` [#4495](https://github.com/rust-lang/rust-clippy/pull/4495)
+* Fix false positive in `unused_unit` [#4445](https://github.com/rust-lang/rust-clippy/pull/4445)
+* Fix false positive in `redundant_pattern` [#4489](https://github.com/rust-lang/rust-clippy/pull/4489)
+* Fix false positive in `wrong_self_convention` [#4369](https://github.com/rust-lang/rust-clippy/pull/4369)
+* Improve various suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4558](https://github.com/rust-lang/rust-clippy/pull/4558)
+* Improve suggestions for `redundant_pattern_matching` [#4352](https://github.com/rust-lang/rust-clippy/pull/4352)
+* Improve suggestions for `explicit_write` [#4544](https://github.com/rust-lang/rust-clippy/pull/4544)
+* Improve suggestion for `or_fun_call` [#4522](https://github.com/rust-lang/rust-clippy/pull/4522)
+* Improve suggestion for `match_as_ref` [#4446](https://github.com/rust-lang/rust-clippy/pull/4446)
+* Improve suggestion for `unnecessary_fold_span` [#4382](https://github.com/rust-lang/rust-clippy/pull/4382)
+* Add suggestions for `unseparated_literal_suffix` [#4401](https://github.com/rust-lang/rust-clippy/pull/4401)
+* Add suggestions for `char_lit_as_u8` [#4418](https://github.com/rust-lang/rust-clippy/pull/4418)
+
+## Rust 1.38
+
+Released 2019-09-26
+
+[e3cb40e...3aea860](https://github.com/rust-lang/rust-clippy/compare/e3cb40e...3aea860)
+
+* New Lints:
+ * [`main_recursion`] [#4203](https://github.com/rust-lang/rust-clippy/pull/4203)
+ * [`inherent_to_string`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`inherent_to_string_shadow_display`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`type_repetition_in_bounds`] [#3766](https://github.com/rust-lang/rust-clippy/pull/3766)
+ * [`try_err`] [#4222](https://github.com/rust-lang/rust-clippy/pull/4222)
+* Move `{unnecessary,panicking}_unwrap` out of nursery [#4307](https://github.com/rust-lang/rust-clippy/pull/4307)
+* Extend the `use_self` lint to suggest uses of `Self::Variant` [#4308](https://github.com/rust-lang/rust-clippy/pull/4308)
+* Improve suggestion for needless return [#4262](https://github.com/rust-lang/rust-clippy/pull/4262)
+* Add auto-fixable suggestion for `let_unit` [#4337](https://github.com/rust-lang/rust-clippy/pull/4337)
+* Fix false positive in `pub_enum_variant_names` and `enum_variant_names` [#4345](https://github.com/rust-lang/rust-clippy/pull/4345)
+* Fix false positive in `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Fix false positive in `string_lit_as_bytes` [#4233](https://github.com/rust-lang/rust-clippy/pull/4233)
+* Fix false positive in `needless_lifetimes` [#4266](https://github.com/rust-lang/rust-clippy/pull/4266)
+* Fix false positive in `float_cmp` [#4275](https://github.com/rust-lang/rust-clippy/pull/4275)
+* Fix false positives in `needless_return` [#4274](https://github.com/rust-lang/rust-clippy/pull/4274)
+* Fix false negative in `match_same_arms` [#4246](https://github.com/rust-lang/rust-clippy/pull/4246)
+* Fix incorrect suggestion for `needless_bool` [#4335](https://github.com/rust-lang/rust-clippy/pull/4335)
+* Improve suggestion for `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Improve suggestion for `single_char_literal` [#4361](https://github.com/rust-lang/rust-clippy/pull/4361)
+* Improve suggestion for `len_zero` [#4314](https://github.com/rust-lang/rust-clippy/pull/4314)
+* Fix ICE in `implicit_hasher` [#4268](https://github.com/rust-lang/rust-clippy/pull/4268)
+* Fix allow bug in `trivially_copy_pass_by_ref` [#4250](https://github.com/rust-lang/rust-clippy/pull/4250)
+
+## Rust 1.37
+
+Released 2019-08-15
+
+[082cfa7...e3cb40e](https://github.com/rust-lang/rust-clippy/compare/082cfa7...e3cb40e)
+
+* New Lints:
+ * [`checked_conversions`] [#4088](https://github.com/rust-lang/rust-clippy/pull/4088)
+ * [`get_last_with_len`] [#3832](https://github.com/rust-lang/rust-clippy/pull/3832)
+ * [`integer_division`] [#4195](https://github.com/rust-lang/rust-clippy/pull/4195)
+* Renamed Lint: `const_static_lifetime` is now called [`redundant_static_lifetimes`].
+ The lint now covers statics in addition to consts [#4162](https://github.com/rust-lang/rust-clippy/pull/4162)
+* [`match_same_arms`] now warns for all identical arms, instead of only the first one [#4102](https://github.com/rust-lang/rust-clippy/pull/4102)
+* [`needless_return`] now works with void functions [#4220](https://github.com/rust-lang/rust-clippy/pull/4220)
+* Fix false positive in [`redundant_closure`] [#4190](https://github.com/rust-lang/rust-clippy/pull/4190)
+* Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107)
+* Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214)
+* Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136)
+* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164)
+* Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119)
+* Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137)
+* Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071)
+* Add macro check for [`unreadable_literal`] [#4099](https://github.com/rust-lang/rust-clippy/pull/4099)
+
+## Rust 1.36
+
+Released 2019-07-04
+
+[eb9f9b1...082cfa7](https://github.com/rust-lang/rust-clippy/compare/eb9f9b1...082cfa7)
+
+* New lints: [`find_map`], [`filter_map_next`] [#4039](https://github.com/rust-lang/rust-clippy/pull/4039)
+* New lint: [`path_buf_push_overwrite`] [#3954](https://github.com/rust-lang/rust-clippy/pull/3954)
+* Move `path_buf_push_overwrite` to the nursery [#4013](https://github.com/rust-lang/rust-clippy/pull/4013)
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Allow allowing of [`toplevel_ref_arg`] lint [#4007](https://github.com/rust-lang/rust-clippy/pull/4007)
+* Fix false negative in [`or_fun_call`] pertaining to nested constructors [#4084](https://github.com/rust-lang/rust-clippy/pull/4084)
+* Fix false positive in [`or_fun_call`] pertaining to enum variant constructors [#4018](https://github.com/rust-lang/rust-clippy/pull/4018)
+* Fix false positive in [`useless_let_if_seq`] pertaining to interior mutability [#4035](https://github.com/rust-lang/rust-clippy/pull/4035)
+* Fix false positive in [`redundant_closure`] pertaining to non-function types [#4008](https://github.com/rust-lang/rust-clippy/pull/4008)
+* Fix false positive in [`let_and_return`] pertaining to attributes on `let`s [#4024](https://github.com/rust-lang/rust-clippy/pull/4024)
+* Fix false positive in [`module_name_repetitions`] lint pertaining to attributes [#4006](https://github.com/rust-lang/rust-clippy/pull/4006)
+* Fix false positive on [`assertions_on_constants`] pertaining to `debug_assert!` [#3989](https://github.com/rust-lang/rust-clippy/pull/3989)
+* Improve suggestion in [`map_clone`] to suggest `.copied()` where applicable [#3970](https://github.com/rust-lang/rust-clippy/pull/3970) [#4043](https://github.com/rust-lang/rust-clippy/pull/4043)
+* Improve suggestion for [`search_is_some`] [#4049](https://github.com/rust-lang/rust-clippy/pull/4049)
+* Improve suggestion applicability for [`naive_bytecount`] [#3984](https://github.com/rust-lang/rust-clippy/pull/3984)
+* Improve suggestion applicability for [`while_let_loop`] [#3975](https://github.com/rust-lang/rust-clippy/pull/3975)
+* Improve diagnostics for [`too_many_arguments`] [#4053](https://github.com/rust-lang/rust-clippy/pull/4053)
+* Improve diagnostics for [`cast_lossless`] [#4021](https://github.com/rust-lang/rust-clippy/pull/4021)
+* Deal with macro checks in desugarings better [#4082](https://github.com/rust-lang/rust-clippy/pull/4082)
+* Add macro check for [`unnecessary_cast`] [#4026](https://github.com/rust-lang/rust-clippy/pull/4026)
+* Remove [`approx_constant`]'s documentation's "Known problems" section. [#4027](https://github.com/rust-lang/rust-clippy/pull/4027)
+* Fix ICE in [`suspicious_else_formatting`] [#3960](https://github.com/rust-lang/rust-clippy/pull/3960)
+* Fix ICE in [`decimal_literal_representation`] [#3931](https://github.com/rust-lang/rust-clippy/pull/3931)
+
+
+## Rust 1.35
+
+Released 2019-05-20
+
+[1fac380..37f5c1e](https://github.com/rust-lang/rust-clippy/compare/1fac380...37f5c1e)
+
+* New lint: `drop_bounds` to detect `T: Drop` bounds
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Rename `cyclomatic_complexity` to [`cognitive_complexity`], start work on making lint more practical for Rust code
+* Move [`get_unwrap`] to the restriction category
+* Improve suggestions for [`iter_cloned_collect`]
+* Improve suggestions for [`cast_lossless`] to suggest suffixed literals
+* Fix false positives in [`print_with_newline`] and [`write_with_newline`] pertaining to raw strings
+* Fix false positive in [`needless_range_loop`] pertaining to structs without a `.iter()`
+* Fix false positive in [`bool_comparison`] pertaining to non-bool types
+* Fix false positive in [`redundant_closure`] pertaining to differences in borrows
+* Fix false positive in `option_map_unwrap_or` on non-copy types
+* Fix false positives in [`missing_const_for_fn`] pertaining to macros and trait method impls
+* Fix false positive in [`needless_pass_by_value`] pertaining to procedural macros
+* Fix false positive in [`needless_continue`] pertaining to loop labels
+* Fix false positive for [`boxed_local`] pertaining to arguments moved into closures
+* Fix false positive for [`use_self`] in nested functions
+* Fix suggestion for [`expect_fun_call`] (https://github.com/rust-lang/rust-clippy/pull/3846)
+* Fix suggestion for [`explicit_counter_loop`] to deal with parenthesizing range variables
+* Fix suggestion for [`single_char_pattern`] to correctly escape single quotes
+* Avoid triggering [`redundant_closure`] in macros
+* ICE fixes: [#3805](https://github.com/rust-lang/rust-clippy/pull/3805), [#3772](https://github.com/rust-lang/rust-clippy/pull/3772), [#3741](https://github.com/rust-lang/rust-clippy/pull/3741)
+
+## Rust 1.34
+
+Released 2019-04-10
+
+[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/1b89724...1fac380)
+
+* New lint: [`assertions_on_constants`] to detect for example `assert!(true)`
+* New lint: [`dbg_macro`] to detect uses of the `dbg!` macro
+* New lint: [`missing_const_for_fn`] that can suggest functions to be made `const`
+* New lint: [`too_many_lines`] to detect functions with excessive LOC. It can be
+ configured using the `too-many-lines-threshold` configuration.
+* New lint: [`wildcard_enum_match_arm`] to check for wildcard enum matches using `_`
+* Expand `redundant_closure` to also work for methods (not only functions)
+* Fix ICEs in `vec_box`, `needless_pass_by_value` and `implicit_hasher`
+* Fix false positive in `cast_sign_loss`
+* Fix false positive in `integer_arithmetic`
+* Fix false positive in `unit_arg`
+* Fix false positives in `implicit_return`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `cast_lossless`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `needless_bool`
+* Fix incorrect suggestion for `needless_range_loop`
+* Fix incorrect suggestion for `use_self`
+* Fix incorrect suggestion for `while_let_on_iterator`
+* Clippy is now slightly easier to invoke in non-cargo contexts. See
+ [#3665][pull3665] for more details.
+* We now have [improved documentation][adding_lints] on how to add new lints
+
+## Rust 1.33
+
+Released 2019-02-26
+
+[b2601be...1b89724](https://github.com/rust-lang/rust-clippy/compare/b2601be...1b89724)
+
+* New lints: [`implicit_return`], [`vec_box`], [`cast_ref_to_mut`]
+* The `rust-clippy` repository is now part of the `rust-lang` org.
+* Rename `stutter` to `module_name_repetitions`
+* Merge `new_without_default_derive` into `new_without_default` lint
+* Move `large_digit_groups` from `style` group to `pedantic`
+* Expand `bool_comparison` to check for `<`, `<=`, `>`, `>=`, and `!=`
+ comparisons against booleans
+* Expand `no_effect` to detect writes to constants such as `A_CONST.field = 2`
+* Expand `redundant_clone` to work on struct fields
+* Expand `suspicious_else_formatting` to detect `if .. {..} {..}`
+* Expand `use_self` to work on tuple structs and also in local macros
+* Fix ICE in `result_map_unit_fn` and `option_map_unit_fn`
+* Fix false positives in `implicit_return`
+* Fix false positives in `use_self`
+* Fix false negative in `clone_on_copy`
+* Fix false positive in `doc_markdown`
+* Fix false positive in `empty_loop`
+* Fix false positive in `if_same_then_else`
+* Fix false positive in `infinite_iter`
+* Fix false positive in `question_mark`
+* Fix false positive in `useless_asref`
+* Fix false positive in `wildcard_dependencies`
+* Fix false positive in `write_with_newline`
+* Add suggestion to `explicit_write`
+* Improve suggestions for `question_mark` lint
+* Fix incorrect suggestion for `get_unwrap`
+
+## Rust 1.32
+
+Released 2019-01-17
+
+[2e26fdc2...b2601be](https://github.com/rust-lang/rust-clippy/compare/2e26fdc2...b2601be)
+
+* New lints: [`slow_vector_initialization`], `mem_discriminant_non_enum`,
+ [`redundant_clone`], [`wildcard_dependencies`],
+ [`into_iter_on_ref`], `into_iter_on_array`, [`deprecated_cfg_attr`],
+ [`cargo_common_metadata`]
+* Add support for `u128` and `i128` to integer related lints
+* Add float support to `mistyped_literal_suffixes`
+* Fix false positives in `use_self`
+* Fix false positives in `missing_comma`
+* Fix false positives in `new_ret_no_self`
+* Fix false positives in `possible_missing_comma`
+* Fix false positive in `integer_arithmetic` in constant items
+* Fix false positive in `needless_borrow`
+* Fix false positive in `out_of_bounds_indexing`
+* Fix false positive in `new_without_default_derive`
+* Fix false positive in `string_lit_as_bytes`
+* Fix false negative in `out_of_bounds_indexing`
+* Fix false negative in `use_self`. It will now also check existential types
+* Fix incorrect suggestion for `redundant_closure_call`
+* Fix various suggestions that contained expanded macros
+* Fix `bool_comparison` triggering 3 times on on on the same code
+* Expand `trivially_copy_pass_by_ref` to work on trait methods
+* Improve suggestion for `needless_range_loop`
+* Move `needless_pass_by_value` from `pedantic` group to `style`
+
+## Rust 1.31
+
+Released 2018-12-06
+
+[125907ad..2e26fdc2](https://github.com/rust-lang/rust-clippy/compare/125907ad..2e26fdc2)
+
+* Clippy has been relicensed under a dual MIT / Apache license.
+ See [#3093](https://github.com/rust-lang/rust-clippy/issues/3093) for more
+ information.
+* With Rust 1.31, Clippy is no longer available via crates.io. The recommended
+ installation method is via `rustup component add clippy`.
+* New lints: [`redundant_pattern_matching`], [`unnecessary_filter_map`],
+ [`unused_unit`], [`map_flatten`], [`mem_replace_option_with_none`]
+* Fix ICE in `if_let_redundant_pattern_matching`
+* Fix ICE in `needless_pass_by_value` when encountering a generic function
+ argument with a lifetime parameter
+* Fix ICE in `needless_range_loop`
+* Fix ICE in `single_char_pattern` when encountering a constant value
+* Fix false positive in `assign_op_pattern`
+* Fix false positive in `boxed_local` on trait implementations
+* Fix false positive in `cmp_owned`
+* Fix false positive in `collapsible_if` when conditionals have comments
+* Fix false positive in `double_parens`
+* Fix false positive in `excessive_precision`
+* Fix false positive in `explicit_counter_loop`
+* Fix false positive in `fn_to_numeric_cast_with_truncation`
+* Fix false positive in `map_clone`
+* Fix false positive in `new_ret_no_self`
+* Fix false positive in `new_without_default` when `new` is unsafe
+* Fix false positive in `type_complexity` when using extern types
+* Fix false positive in `useless_format`
+* Fix false positive in `wrong_self_convention`
+* Fix incorrect suggestion for `excessive_precision`
+* Fix incorrect suggestion for `expect_fun_call`
+* Fix incorrect suggestion for `get_unwrap`
+* Fix incorrect suggestion for `useless_format`
+* `fn_to_numeric_cast_with_truncation` lint can be disabled again
+* Improve suggestions for `manual_memcpy`
+* Improve help message for `needless_lifetimes`
+
+## Rust 1.30
+
+Released 2018-10-25
+
+[14207503...125907ad](https://github.com/rust-lang/rust-clippy/compare/14207503...125907ad)
+
+* Deprecate `assign_ops` lint
+* New lints: [`mistyped_literal_suffixes`], [`ptr_offset_with_cast`],
+ [`needless_collect`], [`copy_iterator`]
+* `cargo clippy -V` now includes the Clippy commit hash of the Rust
+ Clippy component
+* Fix ICE in `implicit_hasher`
+* Fix ICE when encountering `println!("{}" a);`
+* Fix ICE when encountering a macro call in match statements
+* Fix false positive in `default_trait_access`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `similar_names`
+* Fix false positive in `redundant_field_name`
+* Fix false positive in `expect_fun_call`
+* Fix false negative in `identity_conversion`
+* Fix false negative in `explicit_counter_loop`
+* Fix `range_plus_one` suggestion and false negative
+* `print_with_newline` / `write_with_newline`: don't warn about string with several `\n`s in them
+* Fix `useless_attribute` to also whitelist `unused_extern_crates`
+* Fix incorrect suggestion for `single_char_pattern`
+* Improve suggestion for `identity_conversion` lint
+* Move `explicit_iter_loop` and `explicit_into_iter_loop` from `style` group to `pedantic`
+* Move `range_plus_one` and `range_minus_one` from `nursery` group to `complexity`
+* Move `shadow_unrelated` from `restriction` group to `pedantic`
+* Move `indexing_slicing` from `pedantic` group to `restriction`
+
+## Rust 1.29
+
+Released 2018-09-13
+
+[v0.0.212...14207503](https://github.com/rust-lang/rust-clippy/compare/v0.0.212...14207503)
+
+* :tada: :tada: **Rust 1.29 is the first stable Rust that includes a bundled Clippy** :tada:
+ :tada:
+ You can now run `rustup component add clippy-preview` and then `cargo
+ clippy` to run Clippy. This should put an end to the continuous nightly
+ upgrades for Clippy users.
+* Clippy now follows the Rust versioning scheme instead of its own
+* Fix ICE when encountering a `while let (..) = x.iter()` construct
+* Fix false positives in `use_self`
+* Fix false positive in `trivially_copy_pass_by_ref`
+* Fix false positive in `useless_attribute` lint
+* Fix false positive in `print_literal`
+* Fix `use_self` regressions
+* Improve lint message for `neg_cmp_op_on_partial_ord`
+* Improve suggestion highlight for `single_char_pattern`
+* Improve suggestions for various print/write macro lints
+* Improve website header
+
+## 0.0.212 (2018-07-10)
+* Rustup to *rustc 1.29.0-nightly (e06c87544 2018-07-06)*
+
+## 0.0.211
+* Rustup to *rustc 1.28.0-nightly (e3bf634e0 2018-06-28)*
+
+## 0.0.210
+* Rustup to *rustc 1.28.0-nightly (01cc982e9 2018-06-24)*
+
+## 0.0.209
+* Rustup to *rustc 1.28.0-nightly (523097979 2018-06-18)*
+
+## 0.0.208
+* Rustup to *rustc 1.28.0-nightly (86a8f1a63 2018-06-17)*
+
+## 0.0.207
+* Rustup to *rustc 1.28.0-nightly (2a0062974 2018-06-09)*
+
+## 0.0.206
+* Rustup to *rustc 1.28.0-nightly (5bf68db6e 2018-05-28)*
+
+## 0.0.205
+* Rustup to *rustc 1.28.0-nightly (990d8aa74 2018-05-25)*
+* Rename `unused_lifetimes` to `extra_unused_lifetimes` because of naming conflict with new rustc lint
+
+## 0.0.204
+* Rustup to *rustc 1.28.0-nightly (71e87be38 2018-05-22)*
+
+## 0.0.203
+* Rustup to *rustc 1.28.0-nightly (a3085756e 2018-05-19)*
+* Clippy attributes are now of the form `clippy::cyclomatic_complexity` instead of `clippy(cyclomatic_complexity)`
+
+## 0.0.202
+* Rustup to *rustc 1.28.0-nightly (952f344cd 2018-05-18)*
+
+## 0.0.201
+* Rustup to *rustc 1.27.0-nightly (2f2a11dfc 2018-05-16)*
+
+## 0.0.200
+* Rustup to *rustc 1.27.0-nightly (9fae15374 2018-05-13)*
+
+## 0.0.199
+* Rustup to *rustc 1.27.0-nightly (ff2ac35db 2018-05-12)*
+
+## 0.0.198
+* Rustup to *rustc 1.27.0-nightly (acd3871ba 2018-05-10)*
+
+## 0.0.197
+* Rustup to *rustc 1.27.0-nightly (428ea5f6b 2018-05-06)*
+
+## 0.0.196
+* Rustup to *rustc 1.27.0-nightly (e82261dfb 2018-05-03)*
+
+## 0.0.195
+* Rustup to *rustc 1.27.0-nightly (ac3c2288f 2018-04-18)*
+
+## 0.0.194
+* Rustup to *rustc 1.27.0-nightly (bd40cbbe1 2018-04-14)*
+* New lints: [`cast_ptr_alignment`], [`transmute_ptr_to_ptr`], [`write_literal`], [`write_with_newline`], [`writeln_empty_string`]
+
+## 0.0.193
+* Rustup to *rustc 1.27.0-nightly (eeea94c11 2018-04-06)*
+
+## 0.0.192
+* Rustup to *rustc 1.27.0-nightly (fb44b4c0e 2018-04-04)*
+* New lint: [`print_literal`]
+
+## 0.0.191
+* Rustup to *rustc 1.26.0-nightly (ae544ee1c 2018-03-29)*
+* Lint audit; categorize lints as style, correctness, complexity, pedantic, nursery, restriction.
+
+## 0.0.190
+* Fix a bunch of intermittent cargo bugs
+
+## 0.0.189
+* Rustup to *rustc 1.26.0-nightly (5508b2714 2018-03-18)*
+
+## 0.0.188
+* Rustup to *rustc 1.26.0-nightly (392645394 2018-03-15)*
+* New lint: [`while_immutable_condition`]
+
+## 0.0.187
+* Rustup to *rustc 1.26.0-nightly (322d7f7b9 2018-02-25)*
+* New lints: [`redundant_field_names`], [`suspicious_arithmetic_impl`], [`suspicious_op_assign_impl`]
+
+## 0.0.186
+* Rustup to *rustc 1.25.0-nightly (0c6091fbd 2018-02-04)*
+* Various false positive fixes
+
+## 0.0.185
+* Rustup to *rustc 1.25.0-nightly (56733bc9f 2018-02-01)*
+* New lint: [`question_mark`]
+
+## 0.0.184
+* Rustup to *rustc 1.25.0-nightly (90eb44a58 2018-01-29)*
+* New lints: [`double_comparisons`], [`empty_line_after_outer_attr`]
+
+## 0.0.183
+* Rustup to *rustc 1.25.0-nightly (21882aad7 2018-01-28)*
+* New lint: [`misaligned_transmute`]
+
+## 0.0.182
+* Rustup to *rustc 1.25.0-nightly (a0dcecff9 2018-01-24)*
+* New lint: [`decimal_literal_representation`]
+
+## 0.0.181
+* Rustup to *rustc 1.25.0-nightly (97520ccb1 2018-01-21)*
+* New lints: [`else_if_without_else`], [`option_option`], [`unit_arg`], [`unnecessary_fold`]
+* Removed `unit_expr`
+* Various false positive fixes for [`needless_pass_by_value`]
+
+## 0.0.180
+* Rustup to *rustc 1.25.0-nightly (3f92e8d89 2018-01-14)*
+
+## 0.0.179
+* Rustup to *rustc 1.25.0-nightly (61452e506 2018-01-09)*
+
+## 0.0.178
+* Rustup to *rustc 1.25.0-nightly (ee220daca 2018-01-07)*
+
+## 0.0.177
+* Rustup to *rustc 1.24.0-nightly (250b49205 2017-12-21)*
+* New lint: [`match_as_ref`]
+
+## 0.0.176
+* Rustup to *rustc 1.24.0-nightly (0077d128d 2017-12-14)*
+
+## 0.0.175
+* Rustup to *rustc 1.24.0-nightly (bb42071f6 2017-12-01)*
+
+## 0.0.174
+* Rustup to *rustc 1.23.0-nightly (63739ab7b 2017-11-21)*
+
+## 0.0.173
+* Rustup to *rustc 1.23.0-nightly (33374fa9d 2017-11-20)*
+
+## 0.0.172
+* Rustup to *rustc 1.23.0-nightly (d0f8e2913 2017-11-16)*
+
+## 0.0.171
+* Rustup to *rustc 1.23.0-nightly (ff0f5de3b 2017-11-14)*
+
+## 0.0.170
+* Rustup to *rustc 1.23.0-nightly (d6b06c63a 2017-11-09)*
+
+## 0.0.169
+* Rustup to *rustc 1.23.0-nightly (3b82e4c74 2017-11-05)*
+* New lints: [`just_underscores_and_digits`], `result_map_unwrap_or_else`, [`transmute_bytes_to_str`]
+
+## 0.0.168
+* Rustup to *rustc 1.23.0-nightly (f0fe716db 2017-10-30)*
+
+## 0.0.167
+* Rustup to *rustc 1.23.0-nightly (90ef3372e 2017-10-29)*
+* New lints: `const_static_lifetime`, [`erasing_op`], [`fallible_impl_from`], [`println_empty_string`], [`useless_asref`]
+
+## 0.0.166
+* Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)*
+* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], `invalid_ref`, [`option_map_or_none`],
+ [`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`],
+ [`transmute_int_to_float`]
+
+## 0.0.165
+* Rust upgrade to rustc 1.22.0-nightly (0e6f4cf51 2017-09-27)
+* New lint: [`mut_range_bound`]
+
+## 0.0.164
+* Update to *rustc 1.22.0-nightly (6c476ce46 2017-09-25)*
+* New lint: [`int_plus_one`]
+
+## 0.0.163
+* Update to *rustc 1.22.0-nightly (14039a42a 2017-09-22)*
+
+## 0.0.162
+* Update to *rustc 1.22.0-nightly (0701b37d9 2017-09-18)*
+* New lint: [`chars_last_cmp`]
+* Improved suggestions for [`needless_borrow`], [`ptr_arg`],
+
+## 0.0.161
+* Update to *rustc 1.22.0-nightly (539f2083d 2017-09-13)*
+
+## 0.0.160
+* Update to *rustc 1.22.0-nightly (dd08c3070 2017-09-12)*
+
+## 0.0.159
+* Update to *rustc 1.22.0-nightly (eba374fb2 2017-09-11)*
+* New lint: [`clone_on_ref_ptr`]
+
+## 0.0.158
+* New lint: [`manual_memcpy`]
+* [`cast_lossless`] no longer has redundant parentheses in its suggestions
+* Update to *rustc 1.22.0-nightly (dead08cb3 2017-09-08)*
+
+## 0.0.157 - 2017-09-04
+* Update to *rustc 1.22.0-nightly (981ce7d8d 2017-09-03)*
+* New lint: `unit_expr`
+
+## 0.0.156 - 2017-09-03
+* Update to *rustc 1.22.0-nightly (744dd6c1d 2017-09-02)*
+
+## 0.0.155
+* Update to *rustc 1.21.0-nightly (c11f689d2 2017-08-29)*
+* New lint: [`infinite_iter`], [`maybe_infinite_iter`], [`cast_lossless`]
+
+## 0.0.154
+* Update to *rustc 1.21.0-nightly (2c0558f63 2017-08-24)*
+* Fix [`use_self`] triggering inside derives
+* Add support for linting an entire workspace with `cargo clippy --all`
+* New lint: [`naive_bytecount`]
+
+## 0.0.153
+* Update to *rustc 1.21.0-nightly (8c303ed87 2017-08-20)*
+* New lint: [`use_self`]
+
+## 0.0.152
+* Update to *rustc 1.21.0-nightly (df511d554 2017-08-14)*
+
+## 0.0.151
+* Update to *rustc 1.21.0-nightly (13d94d5fa 2017-08-10)*
+
+## 0.0.150
+* Update to *rustc 1.21.0-nightly (215e0b10e 2017-08-08)*
+
+## 0.0.148
+* Update to *rustc 1.21.0-nightly (37c7d0ebb 2017-07-31)*
+* New lints: [`unreadable_literal`], [`inconsistent_digit_grouping`], [`large_digit_groups`]
+
+## 0.0.147
+* Update to *rustc 1.21.0-nightly (aac223f4f 2017-07-30)*
+
+## 0.0.146
+* Update to *rustc 1.21.0-nightly (52a330969 2017-07-27)*
+* Fixes false positives in `inline_always`
+* Fixes false negatives in `panic_params`
+
+## 0.0.145
+* Update to *rustc 1.20.0-nightly (afe145d22 2017-07-23)*
+
+## 0.0.144
+* Update to *rustc 1.20.0-nightly (086eaa78e 2017-07-15)*
+
+## 0.0.143
+* Update to *rustc 1.20.0-nightly (d84693b93 2017-07-09)*
+* Fix `cargo clippy` crashing on `dylib` projects
+* Fix false positives around `nested_while_let` and `never_loop`
+
+## 0.0.142
+* Update to *rustc 1.20.0-nightly (067971139 2017-07-02)*
+
+## 0.0.141
+* Rewrite of the `doc_markdown` lint.
+* Deprecated [`range_step_by_zero`]
+* New lint: [`iterator_step_by_zero`]
+* New lint: [`needless_borrowed_reference`]
+* Update to *rustc 1.20.0-nightly (69c65d296 2017-06-28)*
+
+## 0.0.140 - 2017-06-16
+* Update to *rustc 1.19.0-nightly (258ae6dd9 2017-06-15)*
+
+## 0.0.139 — 2017-06-10
+* Update to *rustc 1.19.0-nightly (4bf5c99af 2017-06-10)*
+* Fix bugs with for loop desugaring
+* Check for [`AsRef`]/[`AsMut`] arguments in [`wrong_self_convention`]
+
+## 0.0.138 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (0418fa9d3 2017-06-04)*
+
+## 0.0.137 — 2017-06-05
+* Update to *rustc 1.19.0-nightly (6684d176c 2017-06-03)*
+
+## 0.0.136 — 2017—05—26
+* Update to *rustc 1.19.0-nightly (557967766 2017-05-26)*
+
+## 0.0.135 — 2017—05—24
+* Update to *rustc 1.19.0-nightly (5b13bff52 2017-05-23)*
+
+## 0.0.134 — 2017—05—19
+* Update to *rustc 1.19.0-nightly (0ed1ec9f9 2017-05-18)*
+
+## 0.0.133 — 2017—05—14
+* Update to *rustc 1.19.0-nightly (826d8f385 2017-05-13)*
+
+## 0.0.132 — 2017—05—05
+* Fix various bugs and some ices
+
+## 0.0.131 — 2017—05—04
+* Update to *rustc 1.19.0-nightly (2d4ed8e0c 2017-05-03)*
+
+## 0.0.130 — 2017—05—03
+* Update to *rustc 1.19.0-nightly (6a5fc9eec 2017-05-02)*
+
+## 0.0.129 — 2017-05-01
+* Update to *rustc 1.19.0-nightly (06fb4d256 2017-04-30)*
+
+## 0.0.128 — 2017-04-28
+* Update to *rustc 1.18.0-nightly (94e884b63 2017-04-27)*
+
+## 0.0.127 — 2017-04-27
+* Update to *rustc 1.18.0-nightly (036983201 2017-04-26)*
+* New lint: [`needless_continue`]
+
+## 0.0.126 — 2017-04-24
+* Update to *rustc 1.18.0-nightly (2bd4b5c6d 2017-04-23)*
+
+## 0.0.125 — 2017-04-19
+* Update to *rustc 1.18.0-nightly (9f2abadca 2017-04-18)*
+
+## 0.0.124 — 2017-04-16
+* Update to *rustc 1.18.0-nightly (d5cf1cb64 2017-04-15)*
+
+## 0.0.123 — 2017-04-07
+* Fix various false positives
+
+## 0.0.122 — 2017-04-07
+* Rustup to *rustc 1.18.0-nightly (91ae22a01 2017-04-05)*
+* New lint: [`op_ref`]
+
+## 0.0.121 — 2017-03-21
+* Rustup to *rustc 1.17.0-nightly (134c4a0f0 2017-03-20)*
+
+## 0.0.120 — 2017-03-17
+* Rustup to *rustc 1.17.0-nightly (0aeb9c129 2017-03-15)*
+
+## 0.0.119 — 2017-03-13
+* Rustup to *rustc 1.17.0-nightly (824c9ebbd 2017-03-12)*
+
+## 0.0.118 — 2017-03-05
+* Rustup to *rustc 1.17.0-nightly (b1e31766d 2017-03-03)*
+
+## 0.0.117 — 2017-03-01
+* Rustup to *rustc 1.17.0-nightly (be760566c 2017-02-28)*
+
+## 0.0.116 — 2017-02-28
+* Fix `cargo clippy` on 64 bit windows systems
+
+## 0.0.115 — 2017-02-27
+* Rustup to *rustc 1.17.0-nightly (60a0edc6c 2017-02-26)*
+* New lints: [`zero_ptr`], [`never_loop`], [`mut_from_ref`]
+
+## 0.0.114 — 2017-02-08
+* Rustup to *rustc 1.17.0-nightly (c49d10207 2017-02-07)*
+* Tests are now ui tests (testing the exact output of rustc)
+
+## 0.0.113 — 2017-02-04
+* Rustup to *rustc 1.16.0-nightly (eedaa94e3 2017-02-02)*
+* New lint: [`large_enum_variant`]
+* `explicit_into_iter_loop` provides suggestions
+
+## 0.0.112 — 2017-01-27
+* Rustup to *rustc 1.16.0-nightly (df8debf6d 2017-01-25)*
+
+## 0.0.111 — 2017-01-21
+* Rustup to *rustc 1.16.0-nightly (a52da95ce 2017-01-20)*
+
+## 0.0.110 — 2017-01-20
+* Add badges and categories to `Cargo.toml`
+
+## 0.0.109 — 2017-01-19
+* Update to *rustc 1.16.0-nightly (c07a6ae77 2017-01-17)*
+
+## 0.0.108 — 2017-01-12
+* Update to *rustc 1.16.0-nightly (2782e8f8f 2017-01-12)*
+
+## 0.0.107 — 2017-01-11
+* Update regex dependency
+* Fix FP when matching `&&mut` by `&ref`
+* Reintroduce `for (_, x) in &mut hash_map` -> `for x in hash_map.values_mut()`
+* New lints: [`unused_io_amount`], [`forget_ref`], [`short_circuit_statement`]
+
+## 0.0.106 — 2017-01-04
+* Fix FP introduced by rustup in [`wrong_self_convention`]
+
+## 0.0.105 — 2017-01-04
+* Update to *rustc 1.16.0-nightly (468227129 2017-01-03)*
+* New lints: [`deref_addrof`], [`double_parens`], [`pub_enum_variant_names`]
+* Fix suggestion in [`new_without_default`]
+* FP fix in [`absurd_extreme_comparisons`]
+
+## 0.0.104 — 2016-12-15
+* Update to *rustc 1.15.0-nightly (8f02c429a 2016-12-15)*
+
+## 0.0.103 — 2016-11-25
+* Update to *rustc 1.15.0-nightly (d5814b03e 2016-11-23)*
+
+## 0.0.102 — 2016-11-24
+* Update to *rustc 1.15.0-nightly (3bf2be9ce 2016-11-22)*
+
+## 0.0.101 — 2016-11-23
+* Update to *rustc 1.15.0-nightly (7b3eeea22 2016-11-21)*
+* New lint: [`string_extend_chars`]
+
+## 0.0.100 — 2016-11-20
+* Update to *rustc 1.15.0-nightly (ac635aa95 2016-11-18)*
+
+## 0.0.99 — 2016-11-18
+* Update to rustc 1.15.0-nightly (0ed951993 2016-11-14)
+* New lint: [`get_unwrap`]
+
+## 0.0.98 — 2016-11-08
+* Fixes an issue due to a change in how cargo handles `--sysroot`, which broke `cargo clippy`
+
+## 0.0.97 — 2016-11-03
+* For convenience, `cargo clippy` defines a `cargo-clippy` feature. This was
+ previously added for a short time under the name `clippy` but removed for
+ compatibility.
+* `cargo clippy --help` is more helping (and less helpful :smile:)
+* Rustup to *rustc 1.14.0-nightly (5665bdf3e 2016-11-02)*
+* New lints: [`if_let_redundant_pattern_matching`], [`partialeq_ne_impl`]
+
+## 0.0.96 — 2016-10-22
+* Rustup to *rustc 1.14.0-nightly (f09420685 2016-10-20)*
+* New lint: [`iter_skip_next`]
+
+## 0.0.95 — 2016-10-06
+* Rustup to *rustc 1.14.0-nightly (3210fd5c2 2016-10-05)*
+
+## 0.0.94 — 2016-10-04
+* Fixes bustage on Windows due to forbidden directory name
+
+## 0.0.93 — 2016-10-03
+* Rustup to *rustc 1.14.0-nightly (144af3e97 2016-10-02)*
+* `option_map_unwrap_or` and `option_map_unwrap_or_else` are now
+ allowed by default.
+* New lint: [`explicit_into_iter_loop`]
+
+## 0.0.92 — 2016-09-30
+* Rustup to *rustc 1.14.0-nightly (289f3a4ca 2016-09-29)*
+
+## 0.0.91 — 2016-09-28
+* Rustup to *rustc 1.13.0-nightly (d0623cf7b 2016-09-26)*
+
+## 0.0.90 — 2016-09-09
+* Rustup to *rustc 1.13.0-nightly (f1f40f850 2016-09-09)*
+
+## 0.0.89 — 2016-09-06
+* Rustup to *rustc 1.13.0-nightly (cbe4de78e 2016-09-05)*
+
+## 0.0.88 — 2016-09-04
+* Rustup to *rustc 1.13.0-nightly (70598e04f 2016-09-03)*
+* The following lints are not new but were only usable through the `clippy`
+ lint groups: [`filter_next`], `for_loop_over_option`,
+ `for_loop_over_result` and [`match_overlapping_arm`]. You should now be
+ able to `#[allow/deny]` them individually and they are available directly
+ through `cargo clippy`.
+
+## 0.0.87 — 2016-08-31
+* Rustup to *rustc 1.13.0-nightly (eac41469d 2016-08-30)*
+* New lints: [`builtin_type_shadow`]
+* Fix FP in [`zero_prefixed_literal`] and `0b`/`0o`
+
+## 0.0.86 — 2016-08-28
+* Rustup to *rustc 1.13.0-nightly (a23064af5 2016-08-27)*
+* New lints: [`missing_docs_in_private_items`], [`zero_prefixed_literal`]
+
+## 0.0.85 — 2016-08-19
+* Fix ICE with [`useless_attribute`]
+* [`useless_attribute`] ignores `unused_imports` on `use` statements
+
+## 0.0.84 — 2016-08-18
+* Rustup to *rustc 1.13.0-nightly (aef6971ca 2016-08-17)*
+
+## 0.0.83 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (1bf5fa326 2016-08-16)*
+* New lints: [`print_with_newline`], [`useless_attribute`]
+
+## 0.0.82 — 2016-08-17
+* Rustup to *rustc 1.12.0-nightly (197be89f3 2016-08-15)*
+* New lint: [`module_inception`]
+
+## 0.0.81 — 2016-08-14
+* Rustup to *rustc 1.12.0-nightly (1deb02ea6 2016-08-12)*
+* New lints: [`eval_order_dependence`], [`mixed_case_hex_literals`], [`unseparated_literal_suffix`]
+* False positive fix in [`too_many_arguments`]
+* Addition of functionality to [`needless_borrow`]
+* Suggestions for [`clone_on_copy`]
+* Bug fix in [`wrong_self_convention`]
+* Doc improvements
+
+## 0.0.80 — 2016-07-31
+* Rustup to *rustc 1.12.0-nightly (1225e122f 2016-07-30)*
+* New lints: [`misrefactored_assign_op`], [`serde_api_misuse`]
+
+## 0.0.79 — 2016-07-10
+* Rustup to *rustc 1.12.0-nightly (f93aaf84c 2016-07-09)*
+* Major suggestions refactoring
+
+## 0.0.78 — 2016-07-02
+* Rustup to *rustc 1.11.0-nightly (01411937f 2016-07-01)*
+* New lints: [`wrong_transmute`], [`double_neg`], [`filter_map`]
+* For compatibility, `cargo clippy` does not defines the `clippy` feature
+ introduced in 0.0.76 anymore
+* [`collapsible_if`] now considers `if let`
+
+## 0.0.77 — 2016-06-21
+* Rustup to *rustc 1.11.0-nightly (5522e678b 2016-06-20)*
+* New lints: `stutter` and [`iter_nth`]
+
+## 0.0.76 — 2016-06-10
+* Rustup to *rustc 1.11.0-nightly (7d2f75a95 2016-06-09)*
+* `cargo clippy` now automatically defines the `clippy` feature
+* New lint: [`not_unsafe_ptr_arg_deref`]
+
+## 0.0.75 — 2016-06-08
+* Rustup to *rustc 1.11.0-nightly (763f9234b 2016-06-06)*
+
+## 0.0.74 — 2016-06-07
+* Fix bug with `cargo-clippy` JSON parsing
+* Add the `CLIPPY_DISABLE_DOCS_LINKS` environment variable to deactivate the
+ “for further information visit *lint-link*” message.
+
+## 0.0.73 — 2016-06-05
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.72 — 2016-06-04
+* Fix false positives in [`useless_let_if_seq`]
+
+## 0.0.71 — 2016-05-31
+* Rustup to *rustc 1.11.0-nightly (a967611d8 2016-05-30)*
+* New lint: [`useless_let_if_seq`]
+
+## 0.0.70 — 2016-05-28
+* Rustup to *rustc 1.10.0-nightly (7bddce693 2016-05-27)*
+* [`invalid_regex`] and [`trivial_regex`] can now warn on `RegexSet::new`,
+ `RegexBuilder::new` and byte regexes
+
+## 0.0.69 — 2016-05-20
+* Rustup to *rustc 1.10.0-nightly (476fe6eef 2016-05-21)*
+* [`used_underscore_binding`] has been made `Allow` temporarily
+
+## 0.0.68 — 2016-05-17
+* Rustup to *rustc 1.10.0-nightly (cd6a40017 2016-05-16)*
+* New lint: [`unnecessary_operation`]
+
+## 0.0.67 — 2016-05-12
+* Rustup to *rustc 1.10.0-nightly (22ac88f1a 2016-05-11)*
+
+## 0.0.66 — 2016-05-11
+* New `cargo clippy` subcommand
+* New lints: [`assign_op_pattern`], [`assign_ops`], [`needless_borrow`]
+
+## 0.0.65 — 2016-05-08
+* Rustup to *rustc 1.10.0-nightly (62e2b2fb7 2016-05-06)*
+* New lints: [`float_arithmetic`], [`integer_arithmetic`]
+
+## 0.0.64 — 2016-04-26
+* Rustup to *rustc 1.10.0-nightly (645dd013a 2016-04-24)*
+* New lints: `temporary_cstring_as_ptr`, [`unsafe_removed_from_name`], and [`mem_forget`]
+
+## 0.0.63 — 2016-04-08
+* Rustup to *rustc 1.9.0-nightly (7979dd608 2016-04-07)*
+
+## 0.0.62 — 2016-04-07
+* Rustup to *rustc 1.9.0-nightly (bf5da36f1 2016-04-06)*
+
+## 0.0.61 — 2016-04-03
+* Rustup to *rustc 1.9.0-nightly (5ab11d72c 2016-04-02)*
+* New lint: [`invalid_upcast_comparisons`]
+
+## 0.0.60 — 2016-04-01
+* Rustup to *rustc 1.9.0-nightly (e1195c24b 2016-03-31)*
+
+## 0.0.59 — 2016-03-31
+* Rustup to *rustc 1.9.0-nightly (30a3849f2 2016-03-30)*
+* New lints: [`logic_bug`], [`nonminimal_bool`]
+* Fixed: [`match_same_arms`] now ignores arms with guards
+* Improved: [`useless_vec`] now warns on `for … in vec![…]`
+
+## 0.0.58 — 2016-03-27
+* Rustup to *rustc 1.9.0-nightly (d5a91e695 2016-03-26)*
+* New lint: [`doc_markdown`]
+
+## 0.0.57 — 2016-03-27
+* Update to *rustc 1.9.0-nightly (a1e29daf1 2016-03-25)*
+* Deprecated lints: [`str_to_string`], [`string_to_string`], [`unstable_as_slice`], [`unstable_as_mut_slice`]
+* New lint: [`crosspointer_transmute`]
+
+## 0.0.56 — 2016-03-23
+* Update to *rustc 1.9.0-nightly (0dcc413e4 2016-03-22)*
+* New lints: [`many_single_char_names`] and [`similar_names`]
+
+## 0.0.55 — 2016-03-21
+* Update to *rustc 1.9.0-nightly (02310fd31 2016-03-19)*
+
+## 0.0.54 — 2016-03-16
+* Update to *rustc 1.9.0-nightly (c66d2380a 2016-03-15)*
+
+## 0.0.53 — 2016-03-15
+* Add a [configuration file]
+
+## ~~0.0.52~~
+
+## 0.0.51 — 2016-03-13
+* Add `str` to types considered by [`len_zero`]
+* New lints: [`indexing_slicing`]
+
+## 0.0.50 — 2016-03-11
+* Update to *rustc 1.9.0-nightly (c9629d61c 2016-03-10)*
+
+## 0.0.49 — 2016-03-09
+* Update to *rustc 1.9.0-nightly (eabfc160f 2016-03-08)*
+* New lints: [`overflow_check_conditional`], `unused_label`, [`new_without_default`]
+
+## 0.0.48 — 2016-03-07
+* Fixed: ICE in [`needless_range_loop`] with globals
+
+## 0.0.47 — 2016-03-07
+* Update to *rustc 1.9.0-nightly (998a6720b 2016-03-07)*
+* New lint: [`redundant_closure_call`]
+
+[`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
+[`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
+[configuration file]: ./rust-clippy#configuration
+[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
+[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/adding_lints.md
+[`README.md`]: https://github.com/rust-lang/rust-clippy/blob/master/README.md
+
+<!-- lint disable no-unused-definitions -->
+<!-- begin autogenerated links to lint list -->
+[`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons
+[`alloc_instead_of_core`]: https://rust-lang.github.io/rust-clippy/master/index.html#alloc_instead_of_core
+[`allow_attributes_without_reason`]: https://rust-lang.github.io/rust-clippy/master/index.html#allow_attributes_without_reason
+[`almost_complete_letter_range`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_complete_letter_range
+[`almost_swapped`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_swapped
+[`approx_constant`]: https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
+[`arithmetic`]: 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_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_names
+[`disallowed_script_idents`]: https://rust-lang.github.io/rust-clippy/master/index.html#disallowed_script_idents
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+[`temporary_cstring_as_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#temporary_cstring_as_ptr
+[`to_digit_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_digit_is_some
+[`to_string_in_display`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_display
+[`to_string_in_format_args`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_format_args
+[`todo`]: https://rust-lang.github.io/rust-clippy/master/index.html#todo
+[`too_many_arguments`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
+[`too_many_lines`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_lines
+[`toplevel_ref_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
+[`trailing_empty_array`]: https://rust-lang.github.io/rust-clippy/master/index.html#trailing_empty_array
+[`trait_duplication_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds
+[`transmute_bytes_to_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_bytes_to_str
+[`transmute_float_to_int`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_float_to_int
+[`transmute_int_to_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_bool
+[`transmute_int_to_char`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_char
+[`transmute_int_to_float`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_float
+[`transmute_num_to_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_num_to_bytes
+[`transmute_ptr_to_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ptr
+[`transmute_ptr_to_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
+[`transmute_undefined_repr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_undefined_repr
+[`transmutes_expressible_as_ptr_casts`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmutes_expressible_as_ptr_casts
+[`transmuting_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmuting_null
+[`trim_split_whitespace`]: https://rust-lang.github.io/rust-clippy/master/index.html#trim_split_whitespace
+[`trivial_regex`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
+[`trivially_copy_pass_by_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
+[`try_err`]: https://rust-lang.github.io/rust-clippy/master/index.html#try_err
+[`type_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
+[`type_repetition_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_repetition_in_bounds
+[`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
- a developer guide and is a good place to start your journey.
+# Contributing to Clippy
+
+Hello fellow Rustacean! Great to see your interest in compiler internals and lints!
+
+**First**: if you're unsure or afraid of _anything_, just ask or submit the issue or pull request anyway. You won't be
+yelled at for giving it your best effort. The worst that can happen is that you'll be politely asked to change
+something. We appreciate any sort of contributions, and don't want a wall of rules to get in the way of that.
+
+Clippy welcomes contributions from everyone. There are many ways to contribute to Clippy and the following document
+explains how you can contribute and how to get started. If you have any questions about contributing or need help with
+anything, feel free to ask questions on issues or visit the `#clippy` on [Zulip].
+
+All contributors are expected to follow the [Rust Code of Conduct].
+
+- [Contributing to Clippy](#contributing-to-clippy)
+ - [The Clippy book](#the-clippy-book)
+ - [High level approach](#high-level-approach)
+ - [Finding something to fix/improve](#finding-something-to-fiximprove)
+ - [Getting code-completion for rustc internals to work](#getting-code-completion-for-rustc-internals-to-work)
+ - [IntelliJ Rust](#intellij-rust)
+ - [Rust Analyzer](#rust-analyzer)
+ - [How Clippy works](#how-clippy-works)
+ - [Issue and PR triage](#issue-and-pr-triage)
+ - [Bors and Homu](#bors-and-homu)
+ - [Contributions](#contributions)
+
+[Zulip]: https://rust-lang.zulipchat.com/#narrow/stream/clippy
+[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct
+
+## The Clippy book
+
+If you're new to Clippy and don't know where to start the [Clippy book] includes
- <!-- FIXME: Link to the deployed book, once it is deployed through CI -->
- [Clippy book]: book/src
++a [developer guide] and is a good place to start your journey.
+
++[Clippy book]: https://doc.rust-lang.org/nightly/clippy/index.html
++[developer guide]: https://doc.rust-lang.org/nightly/clippy/development/index.html
+
+## High level approach
+
+1. Find something to fix/improve
+2. Change code (likely some file in `clippy_lints/src/`)
+3. Follow the instructions in the [Basics docs](book/src/development/basics.md)
+ to get set up
+4. Run `cargo test` in the root directory and wiggle code until it passes
+5. Open a PR (also can be done after 2. if you run into problems)
+
+## Finding something to fix/improve
+
+All issues on Clippy are mentored, if you want help simply ask someone from the
+Clippy team directly by mentioning them in the issue or over on [Zulip]. All
+currently active team members can be found
+[here](https://github.com/rust-lang/highfive/blob/master/highfive/configs/rust-lang/rust-clippy.json#L3)
+
+Some issues are easier than others. The [`good-first-issue`] label can be used to find the easy
+issues. You can use `@rustbot claim` to assign the issue to yourself.
+
+There are also some abandoned PRs, marked with [`S-inactive-closed`].
+Pretty often these PRs are nearly completed and just need some extra steps
+(formatting, addressing review comments, ...) to be merged. If you want to
+complete such a PR, please leave a comment in the PR and open a new one based
+on it.
+
+Issues marked [`T-AST`] involve simple matching of the syntax tree structure,
+and are generally easier than [`T-middle`] issues, which involve types
+and resolved paths.
+
+[`T-AST`] issues will generally need you to match against a predefined syntax structure.
+To figure out how this syntax structure is encoded in the AST, it is recommended to run
+`rustc -Z unpretty=ast-tree` on an example of the structure and compare with the [nodes in the AST docs].
+Usually the lint will end up to be a nested series of matches and ifs, [like so][deep-nesting].
+But we can make it nest-less by using [let chains], [like this][nest-less].
+
+[`E-medium`] issues are generally pretty easy too, though it's recommended you work on an [`good-first-issue`]
+first. Sometimes they are only somewhat involved code wise, but not difficult per-se.
+Note that [`E-medium`] issues may require some knowledge of Clippy internals or some
+debugging to find the actual problem behind the issue.
+
+[`T-middle`] issues can be more involved and require verifying types. The [`ty`] module contains a
+lot of methods that are useful, though one of the most useful would be `expr_ty` (gives the type of
+an AST expression). `match_def_path()` in Clippy's `utils` module can also be useful.
+
+[`good-first-issue`]: https://github.com/rust-lang/rust-clippy/labels/good-first-issue
+[`S-inactive-closed`]: https://github.com/rust-lang/rust-clippy/pulls?q=is%3Aclosed+label%3AS-inactive-closed
+[`T-AST`]: https://github.com/rust-lang/rust-clippy/labels/T-AST
+[`T-middle`]: https://github.com/rust-lang/rust-clippy/labels/T-middle
+[`E-medium`]: https://github.com/rust-lang/rust-clippy/labels/E-medium
+[`ty`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty
+[nodes in the AST docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/ast/
+[deep-nesting]: https://github.com/rust-lang/rust-clippy/blob/5e4f0922911536f80d9591180fa604229ac13939/clippy_lints/src/mem_forget.rs#L31-L45
+[let chains]: https://github.com/rust-lang/rust/pull/94927
+[nest-less]: https://github.com/rust-lang/rust-clippy/blob/5e4f0922911536f80d9591180fa604229ac13939/clippy_lints/src/bit_mask.rs#L133-L159
+
+## Getting code-completion for rustc internals to work
+
+### IntelliJ Rust
+Unfortunately, [`IntelliJ Rust`][IntelliJ_rust_homepage] does not (yet?) understand how Clippy uses compiler-internals
+using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not
+available via a `rustup` component at the time of writing.
+To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via
+`git clone https://github.com/rust-lang/rust/`.
+Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies
+which `IntelliJ Rust` will be able to understand.
+Run `cargo dev setup intellij --repo-path <repo-path>` where `<repo-path>` is a path to the rustc repo
+you just cloned.
+The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to
+Clippy's `Cargo.toml`s and should allow `IntelliJ Rust` to understand most of the types that Clippy uses.
+Just make sure to remove the dependencies again before finally making a pull request!
+
+[rustc_repo]: https://github.com/rust-lang/rust/
+[IntelliJ_rust_homepage]: https://intellij-rust.github.io/
+
+### Rust Analyzer
+As of [#6869][6869], [`rust-analyzer`][ra_homepage] can understand that Clippy uses compiler-internals
+using `extern crate` when `package.metadata.rust-analyzer.rustc_private` is set to `true` in Clippy's `Cargo.toml.`
+You will require a `nightly` toolchain with the `rustc-dev` component installed.
+Make sure that in the `rust-analyzer` configuration, you set
+```json
+{ "rust-analyzer.rustc.source": "discover" }
+```
+and
+```json
+{ "rust-analyzer.updates.channel": "nightly" }
+```
+You should be able to see information on things like `Expr` or `EarlyContext` now if you hover them, also
+a lot more type hints.
+This will work with `rust-analyzer 2021-03-15` shipped in nightly `1.52.0-nightly (107896c32 2021-03-15)` or later.
+
+[ra_homepage]: https://rust-analyzer.github.io/
+[6869]: https://github.com/rust-lang/rust-clippy/pull/6869
+
+## How Clippy works
+
+[`clippy_lints/src/lib.rs`][lint_crate_entry] imports all the different lint modules and registers in the [`LintStore`].
+For example, the [`else_if_without_else`][else_if_without_else] lint is registered like this:
+
+```rust
+// ./clippy_lints/src/lib.rs
+
+// ...
+pub mod else_if_without_else;
+// ...
+
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ // ...
+ store.register_early_pass(|| box else_if_without_else::ElseIfWithoutElse);
+ // ...
+
+ store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
+ // ...
+ LintId::of(&else_if_without_else::ELSE_IF_WITHOUT_ELSE),
+ // ...
+ ]);
+}
+```
+
+The [`rustc_lint::LintStore`][`LintStore`] provides two methods to register lints:
+[register_early_pass][reg_early_pass] and [register_late_pass][reg_late_pass]. Both take an object
+that implements an [`EarlyLintPass`][early_lint_pass] or [`LateLintPass`][late_lint_pass] respectively. This is done in
+every single lint. It's worth noting that the majority of `clippy_lints/src/lib.rs` is autogenerated by `cargo dev
+update_lints`. When you are writing your own lint, you can use that script to save you some time.
+
+```rust
+// ./clippy_lints/src/else_if_without_else.rs
+
+use rustc_lint::{EarlyLintPass, EarlyContext};
+
+// ...
+
+pub struct ElseIfWithoutElse;
+
+// ...
+
+impl EarlyLintPass for ElseIfWithoutElse {
+ // ... the functions needed, to make the lint work
+}
+```
+
+The difference between `EarlyLintPass` and `LateLintPass` is that the methods of the `EarlyLintPass` trait only provide
+AST information. The methods of the `LateLintPass` trait are executed after type checking and contain type information
+via the `LateContext` parameter.
+
+That's why the `else_if_without_else` example uses the `register_early_pass` function. Because the
+[actual lint logic][else_if_without_else] does not depend on any type information.
+
+[lint_crate_entry]: https://github.com/rust-lang/rust-clippy/blob/master/clippy_lints/src/lib.rs
+[else_if_without_else]: https://github.com/rust-lang/rust-clippy/blob/4253aa7137cb7378acc96133c787e49a345c2b3c/clippy_lints/src/else_if_without_else.rs
+[`LintStore`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html
+[reg_early_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_early_pass
+[reg_late_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/struct.LintStore.html#method.register_late_pass
+[early_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.EarlyLintPass.html
+[late_lint_pass]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint/trait.LateLintPass.html
+
+## Issue and PR triage
+
+Clippy is following the [Rust triage procedure][triage] for issues and pull
+requests.
+
+However, we are a smaller project with all contributors being volunteers
+currently. Between writing new lints, fixing issues, reviewing pull requests and
+responding to issues there may not always be enough time to stay on top of it
+all.
+
+Our highest priority is fixing [crashes][l-crash] and [bugs][l-bug], for example
+an ICE in a popular crate that many other crates depend on. We don't
+want Clippy to crash on your code and we want it to be as reliable as the
+suggestions from Rust compiler errors.
+
+We have prioritization labels and a sync-blocker label, which are described below.
+- [P-low][p-low]: Requires attention (fix/response/evaluation) by a team member but isn't urgent.
+- [P-medium][p-medium]: Should be addressed by a team member until the next sync.
+- [P-high][p-high]: Should be immediately addressed and will require an out-of-cycle sync or a backport.
+- [L-sync-blocker][l-sync-blocker]: An issue that "blocks" a sync.
+Or rather: before the sync this should be addressed,
+e.g. by removing a lint again, so it doesn't hit beta/stable.
+
+## Bors and Homu
+
+We use a bot powered by [Homu][homu] to help automate testing and landing of pull
+requests in Clippy. The bot's username is @bors.
+
+You can find the Clippy bors queue [here][homu_queue].
+
+If you have @bors permissions, you can find an overview of the available
+commands [here][homu_instructions].
+
+[triage]: https://forge.rust-lang.org/release/triage-procedure.html
+[l-crash]: https://github.com/rust-lang/rust-clippy/labels/L-crash
+[l-bug]: https://github.com/rust-lang/rust-clippy/labels/L-bug
+[p-low]: https://github.com/rust-lang/rust-clippy/labels/P-low
+[p-medium]: https://github.com/rust-lang/rust-clippy/labels/P-medium
+[p-high]: https://github.com/rust-lang/rust-clippy/labels/P-high
+[l-sync-blocker]: https://github.com/rust-lang/rust-clippy/labels/L-sync-blocker
+[homu]: https://github.com/rust-lang/homu
+[homu_instructions]: https://bors.rust-lang.org/
+[homu_queue]: https://bors.rust-lang.org/queue/clippy
+
+## Contributions
+
+Contributions to Clippy should be made in the form of GitHub pull requests. Each pull request will
+be reviewed by a core contributor (someone with permission to land patches) and either landed in the
+main tree or given feedback for changes that would be required.
+
+All code in this repository is under the [Apache-2.0] or the [MIT] license.
+
+<!-- adapted from https://github.com/servo/servo/blob/master/CONTRIBUTING.md -->
+
+[Apache-2.0]: https://www.apache.org/licenses/LICENSE-2.0
+[MIT]: https://opensource.org/licenses/MIT
--- /dev/null
- version = "0.1.64"
+[package]
+name = "clippy"
++version = "0.1.65"
+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
- blacklisted-names = ["toto", "tata", "titi"]
+# Clippy
+
+[](https://github.com/rust-lang/rust-clippy/actions?query=workflow%3A%22Clippy+Test%22+event%3Apush+branch%3Aauto)
+[](#license)
+
+A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
+
+[There are over 550 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
+
+Lints are divided into categories, each with a default [lint level](https://doc.rust-lang.org/rustc/lints/levels.html).
+You can choose how much Clippy is supposed to ~~annoy~~ help you by changing the lint level by category.
+
+| Category | Description | Default level |
+| --------------------- | ----------------------------------------------------------------------------------- | ------------- |
+| `clippy::all` | all lints that are on by default (correctness, suspicious, style, complexity, perf) | **warn/deny** |
+| `clippy::correctness` | code that is outright wrong or useless | **deny** |
+| `clippy::suspicious` | code that is most likely wrong or useless | **warn** |
+| `clippy::style` | code that should be written in a more idiomatic way | **warn** |
+| `clippy::complexity` | code that does something simple but in a complex way | **warn** |
+| `clippy::perf` | code that can be written to run faster | **warn** |
+| `clippy::pedantic` | lints which are rather strict or have occasional false positives | allow |
+| `clippy::nursery` | new lints that are still under development | allow |
+| `clippy::cargo` | lints for the cargo manifest | allow |
+
+More to come, please [file an issue](https://github.com/rust-lang/rust-clippy/issues) if you have ideas!
+
+The [lint list](https://rust-lang.github.io/rust-clippy/master/index.html) also contains "restriction lints", which are
+for things which are usually not considered "bad", but may be useful to turn on in specific cases. These should be used
+very selectively, if at all.
+
+Table of contents:
+
+* [Usage instructions](#usage)
+* [Configuration](#configuration)
+* [Contributing](#contributing)
+* [License](#license)
+
+## Usage
+
+Below are instructions on how to use Clippy as a cargo subcommand,
+in projects that do not use cargo, or in Travis CI.
+
+### As a cargo subcommand (`cargo clippy`)
+
+One way to use Clippy is by installing Clippy through rustup as a cargo
+subcommand.
+
+#### Step 1: Install Rustup
+
+You can install [Rustup](https://rustup.rs/) on supported platforms. This will help
+us install Clippy and its dependencies.
+
+If you already have Rustup installed, update to ensure you have the latest
+Rustup and compiler:
+
+```terminal
+rustup update
+```
+
+#### Step 2: Install Clippy
+
+Once you have rustup and the latest stable release (at least Rust 1.29) installed, run the following command:
+
+```terminal
+rustup component add clippy
+```
+If it says that it can't find the `clippy` component, please run `rustup self update`.
+
+#### Step 3: Run Clippy
+
+Now you can run Clippy by invoking the following command:
+
+```terminal
+cargo clippy
+```
+
+#### Automatically applying Clippy suggestions
+
+Clippy can automatically apply some lint suggestions, just like the compiler.
+
+```terminal
+cargo clippy --fix
+```
+
+#### Workspaces
+
+All the usual workspace options should work with Clippy. For example the following command
+will run Clippy on the `example` crate:
+
+```terminal
+cargo clippy -p example
+```
+
+As with `cargo check`, this includes dependencies that are members of the workspace, like path dependencies.
+If you want to run Clippy **only** on the given crate, use the `--no-deps` option like this:
+
+```terminal
+cargo clippy -p example -- --no-deps
+```
+
+### Using `clippy-driver`
+
+Clippy can also be used in projects that do not use cargo. To do so, run `clippy-driver`
+with the same arguments you use for `rustc`. For example:
+
+```terminal
+clippy-driver --edition 2018 -Cpanic=abort foo.rs
+```
+
+Note that `clippy-driver` is designed for running Clippy only and should not be used as a general
+replacement for `rustc`. `clippy-driver` may produce artifacts that are not optimized as expected,
+for example.
+
+### Travis CI
+
+You can add Clippy to Travis CI in the same way you use it locally:
+
+```yml
+language: rust
+rust:
+ - stable
+ - beta
+before_script:
+ - rustup component add clippy
+script:
+ - cargo clippy
+ # if you want the build job to fail when encountering warnings, use
+ - cargo clippy -- -D warnings
+ # in order to also check tests and non-default crate features, use
+ - cargo clippy --all-targets --all-features -- -D warnings
+ - cargo test
+ # etc.
+```
+
+Note that adding `-D warnings` will cause your build to fail if **any** warnings are found in your code.
+That includes warnings found by rustc (e.g. `dead_code`, etc.). If you want to avoid this and only cause
+an error for Clippy warnings, use `#![deny(clippy::all)]` in your code or `-D clippy::all` on the command
+line. (You can swap `clippy::all` with the specific lint category you are targeting.)
+
+## Configuration
+
+Some lints can be configured in a TOML file named `clippy.toml` or `.clippy.toml`. It contains a basic `variable =
+value` mapping e.g.
+
+```toml
+avoid-breaking-exported-api = false
++disallowed-names = ["toto", "tata", "titi"]
+cognitive-complexity-threshold = 30
+```
+
+See the [list of lints](https://rust-lang.github.io/rust-clippy/master/index.html) for more information about which
+lints can be configured and the meaning of the variables.
+
+Note that configuration changes will not apply for code that has already been compiled and cached under `./target/`;
+for example, adding a new string to `doc-valid-idents` may still result in Clippy flagging that string. To be sure that
+any configuration changes are applied, you may want to run `cargo clean` and re-compile your crate from scratch.
+
+To deactivate the “for further information visit *lint-link*” message you can
+define the `CLIPPY_DISABLE_DOCS_LINKS` environment variable.
+
+### Allowing/denying lints
+
+You can add options to your code to `allow`/`warn`/`deny` Clippy lints:
+
+* the whole set of `Warn` lints using the `clippy` lint group (`#![deny(clippy::all)]`).
+ Note that `rustc` has additional [lint groups](https://doc.rust-lang.org/rustc/lints/groups.html).
+
+* all lints using both the `clippy` and `clippy::pedantic` lint groups (`#![deny(clippy::all)]`,
+ `#![deny(clippy::pedantic)]`). Note that `clippy::pedantic` contains some very aggressive
+ lints prone to false positives.
+
+* only some lints (`#![deny(clippy::single_match, clippy::box_vec)]`, etc.)
+
+* `allow`/`warn`/`deny` can be limited to a single function or module using `#[allow(...)]`, etc.
+
+Note: `allow` means to suppress the lint for your code. With `warn` the lint
+will only emit a warning, while with `deny` the lint will emit an error, when
+triggering for your code. An error causes clippy to exit with an error code, so
+is useful in scripts like CI/CD.
+
+If you do not want to include your lint levels in your code, you can globally
+enable/disable lints by passing extra flags to Clippy during the run:
+
+To allow `lint_name`, run
+
+```terminal
+cargo clippy -- -A clippy::lint_name
+```
+
+And to warn on `lint_name`, run
+
+```terminal
+cargo clippy -- -W clippy::lint_name
+```
+
+This also works with lint groups. For example, you
+can run Clippy with warnings for all lints enabled:
+```terminal
+cargo clippy -- -W clippy::pedantic
+```
+
+If you care only about a single lint, you can allow all others and then explicitly warn on
+the lint(s) you are interested in:
+```terminal
+cargo clippy -- -A clippy::all -W clippy::useless_format -W clippy::...
+```
+
+### Specifying the minimum supported Rust version
+
+Projects that intend to support old versions of Rust can disable lints pertaining to newer features by
+specifying the minimum supported Rust version (MSRV) in the clippy configuration file.
+
+```toml
+msrv = "1.30.0"
+```
+
+Alternatively, the [`rust-version` field](https://doc.rust-lang.org/cargo/reference/manifest.html#the-rust-version-field)
+in the `Cargo.toml` can be used.
+
+```toml
+# Cargo.toml
+rust-version = "1.30"
+```
+
+The MSRV can also be specified as an inner attribute, like below.
+
+```rust
+#![feature(custom_inner_attributes)]
+#![clippy::msrv = "1.30.0"]
+
+fn main() {
+ ...
+}
+```
+
+You can also omit the patch version when specifying the MSRV, so `msrv = 1.30`
+is equivalent to `msrv = 1.30.0`.
+
+Note: `custom_inner_attributes` is an unstable feature, so it has to be enabled explicitly.
+
+Lints that recognize this configuration option can be found [here](https://rust-lang.github.io/rust-clippy/master/index.html#msrv)
+
+## Contributing
+
+If you want to contribute to Clippy, you can find more information in [CONTRIBUTING.md](https://github.com/rust-lang/rust-clippy/blob/master/CONTRIBUTING.md).
+
+## License
+
+Copyright 2014-2022 The Rust Project Developers
+
+Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+[https://www.apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)> or the MIT license
+<LICENSE-MIT or [https://opensource.org/licenses/MIT](https://opensource.org/licenses/MIT)>, at your
+option. Files in the project may not be
+copied, modified, or distributed except according to those terms.
--- /dev/null
- blacklisted-names = ["toto", "tata", "titi"]
+# Configuring Clippy
+
+> **Note:** The configuration file is unstable and may be deprecated in the future.
+
+Some lints can be configured in a TOML file named `clippy.toml` or `.clippy.toml`. It contains a
+basic `variable = value` mapping eg.
+
+```toml
+avoid-breaking-exported-api = false
++disallowed-names = ["toto", "tata", "titi"]
+cognitive-complexity-threshold = 30
+```
+
+See the [list of lints](https://rust-lang.github.io/rust-clippy/master/index.html) for more information about which
+lints can be configured and the meaning of the variables.
+
+To deactivate the "for further information visit *lint-link*" message you can define the `CLIPPY_DISABLE_DOCS_LINKS`
+environment variable.
+
+### Allowing/denying lints
+
+You can add options to your code to `allow`/`warn`/`deny` Clippy lints:
+
+* the whole set of `Warn` lints using the `clippy` lint group (`#![deny(clippy::all)]`)
+
+* all lints using both the `clippy` and `clippy::pedantic` lint groups (`#![deny(clippy::all)]`,
+ `#![deny(clippy::pedantic)]`). Note that `clippy::pedantic` contains some very aggressive lints prone to false
+ positives.
+
+* only some lints (`#![deny(clippy::single_match, clippy::box_vec)]`, etc.)
+
+* `allow`/`warn`/`deny` can be limited to a single function or module using `#[allow(...)]`, etc.
+
+Note: `allow` means to suppress the lint for your code. With `warn` the lint will only emit a warning, while with `deny`
+the lint will emit an error, when triggering for your code. An error causes clippy to exit with an error code, so is
+useful in scripts like CI/CD.
+
+If you do not want to include your lint levels in your code, you can globally enable/disable lints by passing extra
+flags to Clippy during the run:
+
+To allow `lint_name`, run
+
+```terminal
+cargo clippy -- -A clippy::lint_name
+```
+
+And to warn on `lint_name`, run
+
+```terminal
+cargo clippy -- -W clippy::lint_name
+```
+
+This also works with lint groups. For example you can run Clippy with warnings for all lints enabled:
+
+```terminal
+cargo clippy -- -W clippy::pedantic
+```
+
+If you care only about a single lint, you can allow all others and then explicitly warn on the lint(s) you are
+interested in:
+
+```terminal
+cargo clippy -- -A clippy::all -W clippy::useless_format -W clippy::...
+```
+
+### Specifying the minimum supported Rust version
+
+Projects that intend to support old versions of Rust can disable lints pertaining to newer features by specifying the
+minimum supported Rust version (MSRV) in the clippy configuration file.
+
+```toml
+msrv = "1.30.0"
+```
+
+The MSRV can also be specified as an inner attribute, like below.
+
+```rust
+#![feature(custom_inner_attributes)]
+#![clippy::msrv = "1.30.0"]
+
+fn main() {
+ ...
+}
+```
+
+You can also omit the patch version when specifying the MSRV, so `msrv = 1.30`
+is equivalent to `msrv = 1.30.0`.
+
+Note: `custom_inner_attributes` is an unstable feature so it has to be enabled explicitly.
+
+Lints that recognize this configuration option can be
+found [here](https://rust-lang.github.io/rust-clippy/master/index.html#msrv)
--- /dev/null
- let range = offset..offset + t.len;
+use crate::clippy_project_root;
+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>,
+ 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 {
+ 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")?;
+
+ 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<()> {
+ 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);
+
+ 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);
+ 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")?;
+ 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);
+ 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 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 as usize;
+ 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
- let range = offset..offset + t.len;
+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;
++ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_clippy_lint",
+ ) {
+ let start = range.start;
+
+ let mut 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;
++ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &contents[range.clone()],
+ range,
+ }
+ });
+
+ while let Some(LintDeclSearchResult { range, .. }) = iter.find(
+ |LintDeclSearchResult {
+ token_kind, content, ..
+ }| token_kind == &TokenKind::Ident && *content == "declare_deprecated_lint",
+ ) {
+ let start = range.start;
+
+ let mut iter = iter.by_ref().filter(|LintDeclSearchResult { ref token_kind, .. }| {
+ !matches!(token_kind, TokenKind::Whitespace | TokenKind::LineComment { .. })
+ });
+ let (name, reason) = match_tokens!(
+ iter,
+ // !{
+ Bang OpenBrace
+ // #[clippy::version = "version"]
+ Pound OpenBracket Ident Colon Colon Ident Eq Literal{..} CloseBracket
+ // pub LINT_NAME,
+ Ident Ident(name) Comma
+ // "description"
+ Literal{kind: LiteralKind::Str{..},..}(reason)
+ );
+
+ if let Some(LintDeclSearchResult {
+ token_kind: TokenKind::CloseBrace,
+ range,
+ ..
+ }) = iter.next()
+ {
+ lints.push(DeprecatedLint::new(name, reason, start..range.end));
+ }
+ }
+}
+
+fn parse_renamed_contents(contents: &str, lints: &mut Vec<RenamedLint>) {
+ for line in contents.lines() {
+ let mut offset = 0usize;
+ let mut iter = tokenize(line).map(|t| {
++ let range = offset..offset + t.len as usize;
+ offset = range.end;
+
+ LintDeclSearchResult {
+ token_kind: t.kind,
+ content: &line[range.clone()],
+ range,
+ }
+ });
+
+ let (old_name, new_name) = match_tokens!(
+ iter,
+ // ("old_name",
+ Whitespace OpenParen Literal{kind: LiteralKind::Str{..},..}(old_name) Comma
+ // "new_name"),
+ Whitespace Literal{kind: LiteralKind::Str{..},..}(new_name) CloseParen Comma
+ );
+ lints.push(RenamedLint::new(old_name, new_name));
+ }
+}
+
+/// Removes the line splices and surrounding quotes from a string literal
+fn remove_line_splices(s: &str) -> String {
+ let s = s
+ .strip_prefix('r')
+ .unwrap_or(s)
+ .trim_matches('#')
+ .strip_prefix('"')
+ .and_then(|s| s.strip_suffix('"'))
+ .unwrap_or_else(|| panic!("expected quoted string, found `{}`", s));
+ let mut res = String::with_capacity(s.len());
+ unescape::unescape_literal(s, unescape::Mode::Str, &mut |range, _| 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
- version = "0.1.64"
+[package]
+name = "clippy_lints"
++version = "0.1.65"
+description = "A bunch of helpful lints to avoid common pitfalls in Rust"
+repository = "https://github.com/rust-lang/rust-clippy"
+readme = "README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["clippy", "lint", "plugin"]
+edition = "2021"
+
+[dependencies]
+cargo_metadata = "0.14"
+clippy_utils = { path = "../clippy_utils" }
+if_chain = "1.0"
+itertools = "0.10.1"
+pulldown-cmark = { version = "0.9", default-features = false }
+quine-mc_cluskey = "0.2"
+regex-syntax = "0.6"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = { version = "1.0", optional = true }
+tempfile = { version = "3.2", optional = true }
+toml = "0.5"
+unicode-normalization = "0.1"
+unicode-script = { version = "0.5", default-features = false }
+semver = "1.0"
+rustc-semver = "1.1"
+# NOTE: cargo requires serde feat in its url dep
+# see <https://github.com/rust-lang/rust/pull/63587#issuecomment-522343864>
+url = { version = "2.2", features = ["serde"] }
+
+[features]
+deny-warnings = ["clippy_utils/deny-warnings"]
+# build clippy with internal lints enabled, off by default
+internal = ["clippy_utils/internal", "serde_json", "tempfile"]
+
+[package.metadata.rust-analyzer]
+# This crate uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
- && local_used_after_expr(cx, binding_id, recv) {
+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.
+ ///
+ /// ### Known problems
+ /// The suggested replacement decreases the readability of code and log output.
+ ///
+ /// ### 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,
+ restriction,
+ "`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)
- "is_ok" if has_debug_impl(cx, substs.type_at(1)) => {
++ && local_used_after_expr(cx, binding_id, recv)
++ {
+ return;
+ }
+ }
+ let mut app = Applicability::MachineApplicable;
+ match method_segment.ident.as_str() {
- "is_err" if has_debug_impl(cx, substs.type_at(0)) => {
++ "is_ok" if type_suitable_to_unwrap(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 type_suitable_to_unwrap(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, &[]))
+}
++
++fn type_suitable_to_unwrap<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
++ has_debug_impl(cx, ty) && !ty.is_unit() && !ty.is_never()
++}
--- /dev/null
- pub LOGIC_BUG,
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
+use clippy_utils::source::snippet_opt;
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use clippy_utils::{eq_expr_value, get_trait_def_id, paths};
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::{BinOpKind, Body, Expr, ExprKind, FnDecl, HirId, UnOp};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for boolean expressions that can be written more
+ /// concisely.
+ ///
+ /// ### Why is this bad?
+ /// Readability of boolean expressions suffers from
+ /// unnecessary duplication.
+ ///
+ /// ### Known problems
+ /// Ignores short circuiting behavior of `||` and
+ /// `&&`. Ignores `|`, `&` and `^`.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// if a && true {}
+ /// if !(a == b) {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// if a {}
+ /// if a != b {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NONMINIMAL_BOOL,
+ complexity,
+ "boolean expressions that can be written more concisely"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for boolean expressions that contain terminals that
+ /// can be eliminated.
+ ///
+ /// ### Why is this bad?
+ /// This is most likely a logic bug.
+ ///
+ /// ### Known problems
+ /// Ignores short circuiting behavior.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // The `b` is unnecessary, the expression is equivalent to `if a`.
+ /// if a && b || a { ... }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// if a {}
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
- declare_lint_pass!(NonminimalBool => [NONMINIMAL_BOOL, LOGIC_BUG]);
++ pub OVERLY_COMPLEX_BOOL_EXPR,
+ correctness,
+ "boolean expressions that contain terminals which can be eliminated"
+}
+
+// For each pairs, both orders are considered.
+const METHODS_WITH_NEGATION: [(&str, &str); 2] = [("is_some", "is_none"), ("is_err", "is_ok")];
+
- LOGIC_BUG,
++declare_lint_pass!(NonminimalBool => [NONMINIMAL_BOOL, OVERLY_COMPLEX_BOOL_EXPR]);
+
+impl<'tcx> LateLintPass<'tcx> for NonminimalBool {
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ _: FnKind<'tcx>,
+ _: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ _: Span,
+ _: HirId,
+ ) {
+ NonminimalBoolVisitor { cx }.visit_body(body);
+ }
+}
+
+struct NonminimalBoolVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+}
+
+use quine_mc_cluskey::Bool;
+struct Hir2Qmm<'a, 'tcx, 'v> {
+ terminals: Vec<&'v Expr<'v>>,
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
+ fn extract(&mut self, op: BinOpKind, a: &[&'v Expr<'_>], mut v: Vec<Bool>) -> Result<Vec<Bool>, String> {
+ for a in a {
+ if let ExprKind::Binary(binop, lhs, rhs) = &a.kind {
+ if binop.node == op {
+ v = self.extract(op, &[lhs, rhs], v)?;
+ continue;
+ }
+ }
+ v.push(self.run(a)?);
+ }
+ Ok(v)
+ }
+
+ fn run(&mut self, e: &'v Expr<'_>) -> Result<Bool, String> {
+ fn negate(bin_op_kind: BinOpKind) -> Option<BinOpKind> {
+ match bin_op_kind {
+ BinOpKind::Eq => Some(BinOpKind::Ne),
+ BinOpKind::Ne => Some(BinOpKind::Eq),
+ BinOpKind::Gt => Some(BinOpKind::Le),
+ BinOpKind::Ge => Some(BinOpKind::Lt),
+ BinOpKind::Lt => Some(BinOpKind::Ge),
+ BinOpKind::Le => Some(BinOpKind::Gt),
+ _ => None,
+ }
+ }
+
+ // prevent folding of `cfg!` macros and the like
+ if !e.span.from_expansion() {
+ match &e.kind {
+ ExprKind::Unary(UnOp::Not, inner) => return Ok(Bool::Not(Box::new(self.run(inner)?))),
+ ExprKind::Binary(binop, lhs, rhs) => match &binop.node {
+ BinOpKind::Or => {
+ return Ok(Bool::Or(self.extract(BinOpKind::Or, &[lhs, rhs], Vec::new())?));
+ },
+ BinOpKind::And => {
+ return Ok(Bool::And(self.extract(BinOpKind::And, &[lhs, rhs], Vec::new())?));
+ },
+ _ => (),
+ },
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Bool(true) => return Ok(Bool::True),
+ LitKind::Bool(false) => return Ok(Bool::False),
+ _ => (),
+ },
+ _ => (),
+ }
+ }
+ for (n, expr) in self.terminals.iter().enumerate() {
+ if eq_expr_value(self.cx, e, expr) {
+ #[expect(clippy::cast_possible_truncation)]
+ return Ok(Bool::Term(n as u8));
+ }
+
+ if_chain! {
+ if let ExprKind::Binary(e_binop, e_lhs, e_rhs) = &e.kind;
+ if implements_ord(self.cx, e_lhs);
+ if let ExprKind::Binary(expr_binop, expr_lhs, expr_rhs) = &expr.kind;
+ if negate(e_binop.node) == Some(expr_binop.node);
+ if eq_expr_value(self.cx, e_lhs, expr_lhs);
+ if eq_expr_value(self.cx, e_rhs, expr_rhs);
+ then {
+ #[expect(clippy::cast_possible_truncation)]
+ return Ok(Bool::Not(Box::new(Bool::Term(n as u8))));
+ }
+ }
+ }
+ let n = self.terminals.len();
+ self.terminals.push(e);
+ if n < 32 {
+ #[expect(clippy::cast_possible_truncation)]
+ Ok(Bool::Term(n as u8))
+ } else {
+ Err("too many literals".to_owned())
+ }
+ }
+}
+
+struct SuggestContext<'a, 'tcx, 'v> {
+ terminals: &'v [&'v Expr<'v>],
+ cx: &'a LateContext<'tcx>,
+ output: String,
+}
+
+impl<'a, 'tcx, 'v> SuggestContext<'a, 'tcx, 'v> {
+ fn recurse(&mut self, suggestion: &Bool) -> Option<()> {
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ match suggestion {
+ True => {
+ self.output.push_str("true");
+ },
+ False => {
+ self.output.push_str("false");
+ },
+ Not(inner) => match **inner {
+ And(_) | Or(_) => {
+ self.output.push('!');
+ self.output.push('(');
+ self.recurse(inner);
+ self.output.push(')');
+ },
+ Term(n) => {
+ let terminal = self.terminals[n as usize];
+ if let Some(str) = simplify_not(self.cx, terminal) {
+ self.output.push_str(&str);
+ } else {
+ self.output.push('!');
+ let snip = snippet_opt(self.cx, terminal.span)?;
+ self.output.push_str(&snip);
+ }
+ },
+ True | False | Not(_) => {
+ self.output.push('!');
+ self.recurse(inner)?;
+ },
+ },
+ And(v) => {
+ for (index, inner) in v.iter().enumerate() {
+ if index > 0 {
+ self.output.push_str(" && ");
+ }
+ if let Or(_) = *inner {
+ self.output.push('(');
+ self.recurse(inner);
+ self.output.push(')');
+ } else {
+ self.recurse(inner);
+ }
+ }
+ },
+ Or(v) => {
+ for (index, inner) in v.iter().rev().enumerate() {
+ if index > 0 {
+ self.output.push_str(" || ");
+ }
+ self.recurse(inner);
+ }
+ },
+ &Term(n) => {
+ let snip = snippet_opt(self.cx, self.terminals[n as usize].span)?;
+ self.output.push_str(&snip);
+ },
+ }
+ Some(())
+ }
+}
+
+fn simplify_not(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
+ match &expr.kind {
+ ExprKind::Binary(binop, lhs, rhs) => {
+ if !implements_ord(cx, lhs) {
+ return None;
+ }
+
+ match binop.node {
+ BinOpKind::Eq => Some(" != "),
+ BinOpKind::Ne => Some(" == "),
+ BinOpKind::Lt => Some(" >= "),
+ BinOpKind::Gt => Some(" <= "),
+ BinOpKind::Le => Some(" > "),
+ BinOpKind::Ge => Some(" < "),
+ _ => None,
+ }
+ .and_then(|op| {
+ Some(format!(
+ "{}{}{}",
+ snippet_opt(cx, lhs.span)?,
+ op,
+ snippet_opt(cx, rhs.span)?
+ ))
+ })
+ },
+ ExprKind::MethodCall(path, args, _) if args.len() == 1 => {
+ let type_of_receiver = cx.typeck_results().expr_ty(&args[0]);
+ if !is_type_diagnostic_item(cx, type_of_receiver, sym::Option)
+ && !is_type_diagnostic_item(cx, type_of_receiver, sym::Result)
+ {
+ return None;
+ }
+ METHODS_WITH_NEGATION
+ .iter()
+ .copied()
+ .flat_map(|(a, b)| vec![(a, b), (b, a)])
+ .find(|&(a, _)| {
+ let path: &str = path.ident.name.as_str();
+ a == path
+ })
+ .and_then(|(_, neg_method)| Some(format!("{}.{}()", snippet_opt(cx, args[0].span)?, neg_method)))
+ },
+ _ => None,
+ }
+}
+
+fn suggest(cx: &LateContext<'_>, suggestion: &Bool, terminals: &[&Expr<'_>]) -> String {
+ let mut suggest_context = SuggestContext {
+ terminals,
+ cx,
+ output: String::new(),
+ };
+ suggest_context.recurse(suggestion);
+ suggest_context.output
+}
+
+fn simple_negate(b: Bool) -> Bool {
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ match b {
+ True => False,
+ False => True,
+ t @ Term(_) => Not(Box::new(t)),
+ And(mut v) => {
+ for el in &mut v {
+ *el = simple_negate(::std::mem::replace(el, True));
+ }
+ Or(v)
+ },
+ Or(mut v) => {
+ for el in &mut v {
+ *el = simple_negate(::std::mem::replace(el, True));
+ }
+ And(v)
+ },
+ Not(inner) => *inner,
+ }
+}
+
+#[derive(Default)]
+struct Stats {
+ terminals: [usize; 32],
+ negations: usize,
+ ops: usize,
+}
+
+fn terminal_stats(b: &Bool) -> Stats {
+ fn recurse(b: &Bool, stats: &mut Stats) {
+ match b {
+ True | False => stats.ops += 1,
+ Not(inner) => {
+ match **inner {
+ And(_) | Or(_) => stats.ops += 1, // brackets are also operations
+ _ => stats.negations += 1,
+ }
+ recurse(inner, stats);
+ },
+ And(v) | Or(v) => {
+ stats.ops += v.len() - 1;
+ for inner in v {
+ recurse(inner, stats);
+ }
+ },
+ &Term(n) => stats.terminals[n as usize] += 1,
+ }
+ }
+ use quine_mc_cluskey::Bool::{And, False, Not, Or, Term, True};
+ let mut stats = Stats::default();
+ recurse(b, &mut stats);
+ stats
+}
+
+impl<'a, 'tcx> NonminimalBoolVisitor<'a, 'tcx> {
+ fn bool_expr(&self, e: &'tcx Expr<'_>) {
+ let mut h2q = Hir2Qmm {
+ terminals: Vec::new(),
+ cx: self.cx,
+ };
+ if let Ok(expr) = h2q.run(e) {
+ if h2q.terminals.len() > 8 {
+ // QMC has exponentially slow behavior as the number of terminals increases
+ // 8 is reasonable, it takes approximately 0.2 seconds.
+ // See #825
+ return;
+ }
+
+ let stats = terminal_stats(&expr);
+ let mut simplified = expr.simplify();
+ for simple in Bool::Not(Box::new(expr)).simplify() {
+ match simple {
+ Bool::Not(_) | Bool::True | Bool::False => {},
+ _ => simplified.push(Bool::Not(Box::new(simple.clone()))),
+ }
+ let simple_negated = simple_negate(simple);
+ if simplified.iter().any(|s| *s == simple_negated) {
+ continue;
+ }
+ simplified.push(simple_negated);
+ }
+ let mut improvements = Vec::with_capacity(simplified.len());
+ 'simplified: for suggestion in &simplified {
+ let simplified_stats = terminal_stats(suggestion);
+ let mut improvement = false;
+ for i in 0..32 {
+ // ignore any "simplifications" that end up requiring a terminal more often
+ // than in the original expression
+ if stats.terminals[i] < simplified_stats.terminals[i] {
+ continue 'simplified;
+ }
+ if stats.terminals[i] != 0 && simplified_stats.terminals[i] == 0 {
+ span_lint_hir_and_then(
+ self.cx,
++ OVERLY_COMPLEX_BOOL_EXPR,
+ e.hir_id,
+ e.span,
+ "this boolean expression contains a logic bug",
+ |diag| {
+ diag.span_help(
+ h2q.terminals[i].span,
+ "this expression can be optimized out by applying boolean operations to the \
+ outer expression",
+ );
+ diag.span_suggestion(
+ e.span,
+ "it would look like the following",
+ suggest(self.cx, suggestion, &h2q.terminals),
+ // nonminimal_bool can produce minimal but
+ // not human readable expressions (#3141)
+ Applicability::Unspecified,
+ );
+ },
+ );
+ // don't also lint `NONMINIMAL_BOOL`
+ return;
+ }
+ // if the number of occurrences of a terminal decreases or any of the stats
+ // decreases while none increases
+ improvement |= (stats.terminals[i] > simplified_stats.terminals[i])
+ || (stats.negations > simplified_stats.negations && stats.ops == simplified_stats.ops)
+ || (stats.ops > simplified_stats.ops && stats.negations == simplified_stats.negations);
+ }
+ if improvement {
+ improvements.push(suggestion);
+ }
+ }
+ let nonminimal_bool_lint = |suggestions: Vec<_>| {
+ span_lint_hir_and_then(
+ self.cx,
+ NONMINIMAL_BOOL,
+ e.hir_id,
+ e.span,
+ "this boolean expression can be simplified",
+ |diag| {
+ diag.span_suggestions(
+ e.span,
+ "try",
+ suggestions.into_iter(),
+ // nonminimal_bool can produce minimal but
+ // not human readable expressions (#3141)
+ Applicability::Unspecified,
+ );
+ },
+ );
+ };
+ if improvements.is_empty() {
+ let mut visitor = NotSimplificationVisitor { cx: self.cx };
+ visitor.visit_expr(e);
+ } else {
+ nonminimal_bool_lint(
+ improvements
+ .into_iter()
+ .map(|suggestion| suggest(self.cx, suggestion, &h2q.terminals))
+ .collect(),
+ );
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for NonminimalBoolVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !e.span.from_expansion() {
+ match &e.kind {
+ ExprKind::Binary(binop, _, _) if binop.node == BinOpKind::Or || binop.node == BinOpKind::And => {
+ self.bool_expr(e);
+ },
+ ExprKind::Unary(UnOp::Not, inner) => {
+ if self.cx.typeck_results().node_types()[inner.hir_id].is_bool() {
+ self.bool_expr(e);
+ }
+ },
+ _ => {},
+ }
+ }
+ walk_expr(self, e);
+ }
+}
+
+fn implements_ord<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> bool {
+ let ty = cx.typeck_results().expr_ty(expr);
+ get_trait_def_id(cx, &paths::ORD).map_or(false, |id| implements_trait(cx, ty, id, &[]))
+}
+
+struct NotSimplificationVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for NotSimplificationVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Unary(UnOp::Not, inner) = &expr.kind {
+ if let Some(suggestion) = simplify_not(self.cx, inner) {
+ span_lint_and_sugg(
+ self.cx,
+ NONMINIMAL_BOOL,
+ expr.span,
+ "this boolean expression can be simplified",
+ "try",
+ suggestion,
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+
+ walk_expr(self, expr);
+ }
+}
--- /dev/null
- format!("{}.unsigned_abs()", Sugg::hir(cx, &args[0], "..")),
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::sugg::Sugg;
+use clippy_utils::{meets_msrv, msrvs};
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+use rustc_semver::RustcVersion;
+
+use super::CAST_ABS_TO_UNSIGNED;
+
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ cast_expr: &Expr<'_>,
+ cast_from: Ty<'_>,
+ cast_to: Ty<'_>,
+ msrv: Option<RustcVersion>,
+) {
+ if meets_msrv(msrv, msrvs::UNSIGNED_ABS)
+ && let ty::Int(from) = cast_from.kind()
+ && let ty::Uint(to) = cast_to.kind()
+ && let ExprKind::MethodCall(method_path, args, _) = cast_expr.kind
+ && method_path.ident.name.as_str() == "abs"
+ {
+ let span = if from.bit_width() == to.bit_width() {
+ expr.span
+ } else {
+ // if the result of `.unsigned_abs` would be a different type, keep the cast
+ // e.g. `i64 -> usize`, `i16 -> u8`
+ cast_expr.span
+ };
+
+ span_lint_and_sugg(
+ cx,
+ CAST_ABS_TO_UNSIGNED,
+ span,
+ &format!("casting the result of `{cast_from}::abs()` to {cast_to}"),
+ "replace with",
++ format!("{}.unsigned_abs()", Sugg::hir(cx, &args[0], "..").maybe_par()),
+ Applicability::MachineApplicable,
+ );
+ }
+}
--- /dev/null
- if let ExprKind::Call(from_func, args) = &expr.kind;
- // `to_type::max_value()`
- if args.len() == 1;
- if let limit = &args[0];
+//! lint on manually implemented checked conversions that could be transformed into `try_from`
+
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{in_constant, meets_msrv, msrvs, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOp, BinOpKind, Expr, ExprKind, QPath, TyKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit bounds checking when casting.
+ ///
+ /// ### Why is this bad?
+ /// Reduces the readability of statements & is error prone.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo: u32 = 5;
+ /// foo <= i32::MAX as u32;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = 1;
+ /// # #[allow(unused)]
+ /// i32::try_from(foo).is_ok();
+ /// ```
+ #[clippy::version = "1.37.0"]
+ pub CHECKED_CONVERSIONS,
+ pedantic,
+ "`try_from` could replace manual bounds checking when casting"
+}
+
+pub struct CheckedConversions {
+ msrv: Option<RustcVersion>,
+}
+
+impl CheckedConversions {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(CheckedConversions => [CHECKED_CONVERSIONS]);
+
+impl<'tcx> LateLintPass<'tcx> for CheckedConversions {
+ fn check_expr(&mut self, cx: &LateContext<'_>, item: &Expr<'_>) {
+ if !meets_msrv(self.msrv, msrvs::TRY_FROM) {
+ return;
+ }
+
+ let result = if_chain! {
+ if !in_constant(cx, item.hir_id);
+ if !in_external_macro(cx.sess(), item.span);
+ if let ExprKind::Binary(op, left, right) = &item.kind;
+
+ then {
+ match op.node {
+ BinOpKind::Ge | BinOpKind::Le => single_check(item),
+ BinOpKind::And => double_check(cx, left, right),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ };
+
+ if let Some(cv) = result {
+ if let Some(to_type) = cv.to_type {
+ let mut applicability = Applicability::MachineApplicable;
+ let snippet = snippet_with_applicability(cx, cv.expr_to_cast.span, "_", &mut applicability);
+ span_lint_and_sugg(
+ cx,
+ CHECKED_CONVERSIONS,
+ item.span,
+ "checked cast can be simplified",
+ "try",
+ format!("{}::try_from({}).is_ok()", to_type, snippet),
+ applicability,
+ );
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+/// Searches for a single check from unsigned to _ is done
+/// todo: check for case signed -> larger unsigned == only x >= 0
+fn single_check<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<Conversion<'tcx>> {
+ check_upper_bound(expr).filter(|cv| cv.cvt == ConversionType::FromUnsigned)
+}
+
+/// Searches for a combination of upper & lower bound checks
+fn double_check<'a>(cx: &LateContext<'_>, left: &'a Expr<'_>, right: &'a Expr<'_>) -> Option<Conversion<'a>> {
+ let upper_lower = |l, r| {
+ let upper = check_upper_bound(l);
+ let lower = check_lower_bound(r);
+
+ upper.zip(lower).and_then(|(l, r)| l.combine(r, cx))
+ };
+
+ upper_lower(left, right).or_else(|| upper_lower(right, left))
+}
+
+/// Contains the result of a tried conversion check
+#[derive(Clone, Debug)]
+struct Conversion<'a> {
+ cvt: ConversionType,
+ expr_to_cast: &'a Expr<'a>,
+ to_type: Option<&'a str>,
+}
+
+/// The kind of conversion that is checked
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+enum ConversionType {
+ SignedToUnsigned,
+ SignedToSigned,
+ FromUnsigned,
+}
+
+impl<'a> Conversion<'a> {
+ /// Combine multiple conversions if the are compatible
+ pub fn combine(self, other: Self, cx: &LateContext<'_>) -> Option<Conversion<'a>> {
+ if self.is_compatible(&other, cx) {
+ // Prefer a Conversion that contains a type-constraint
+ Some(if self.to_type.is_some() { self } else { other })
+ } else {
+ None
+ }
+ }
+
+ /// Checks if two conversions are compatible
+ /// same type of conversion, same 'castee' and same 'to type'
+ pub fn is_compatible(&self, other: &Self, cx: &LateContext<'_>) -> bool {
+ (self.cvt == other.cvt)
+ && (SpanlessEq::new(cx).eq_expr(self.expr_to_cast, other.expr_to_cast))
+ && (self.has_compatible_to_type(other))
+ }
+
+ /// Checks if the to-type is the same (if there is a type constraint)
+ fn has_compatible_to_type(&self, other: &Self) -> bool {
+ match (self.to_type, other.to_type) {
+ (Some(l), Some(r)) => l == r,
+ _ => true,
+ }
+ }
+
+ /// Try to construct a new conversion if the conversion type is valid
+ fn try_new(expr_to_cast: &'a Expr<'_>, from_type: &str, to_type: &'a str) -> Option<Conversion<'a>> {
+ ConversionType::try_new(from_type, to_type).map(|cvt| Conversion {
+ cvt,
+ expr_to_cast,
+ to_type: Some(to_type),
+ })
+ }
+
+ /// Construct a new conversion without type constraint
+ fn new_any(expr_to_cast: &'a Expr<'_>) -> Conversion<'a> {
+ Conversion {
+ cvt: ConversionType::SignedToUnsigned,
+ expr_to_cast,
+ to_type: None,
+ }
+ }
+}
+
+impl ConversionType {
+ /// Creates a conversion type if the type is allowed & conversion is valid
+ #[must_use]
+ fn try_new(from: &str, to: &str) -> Option<Self> {
+ if UINTS.contains(&from) {
+ Some(Self::FromUnsigned)
+ } else if SINTS.contains(&from) {
+ if UINTS.contains(&to) {
+ Some(Self::SignedToUnsigned)
+ } else if SINTS.contains(&to) {
+ Some(Self::SignedToSigned)
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ }
+}
+
+/// Check for `expr <= (to_type::MAX as from_type)`
+fn check_upper_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<Conversion<'tcx>> {
+ if_chain! {
+ if let ExprKind::Binary(ref op, left, right) = &expr.kind;
+ if let Some((candidate, check)) = normalize_le_ge(op, left, right);
+ if let Some((from, to)) = get_types_from_cast(check, INTS, "max_value", "MAX");
+
+ then {
+ Conversion::try_new(candidate, from, to)
+ } else {
+ None
+ }
+ }
+}
+
+/// Check for `expr >= 0|(to_type::MIN as from_type)`
+fn check_lower_bound<'tcx>(expr: &'tcx Expr<'tcx>) -> Option<Conversion<'tcx>> {
+ fn check_function<'a>(candidate: &'a Expr<'a>, check: &'a Expr<'a>) -> Option<Conversion<'a>> {
+ (check_lower_bound_zero(candidate, check)).or_else(|| (check_lower_bound_min(candidate, check)))
+ }
+
+ // First of we need a binary containing the expression & the cast
+ if let ExprKind::Binary(ref op, left, right) = &expr.kind {
+ normalize_le_ge(op, right, left).and_then(|(l, r)| check_function(l, r))
+ } else {
+ None
+ }
+}
+
+/// Check for `expr >= 0`
+fn check_lower_bound_zero<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Option<Conversion<'a>> {
+ if_chain! {
+ if let ExprKind::Lit(ref lit) = &check.kind;
+ if let LitKind::Int(0, _) = &lit.node;
+
+ then {
+ Some(Conversion::new_any(candidate))
+ } else {
+ None
+ }
+ }
+}
+
+/// Check for `expr >= (to_type::MIN as from_type)`
+fn check_lower_bound_min<'a>(candidate: &'a Expr<'_>, check: &'a Expr<'_>) -> Option<Conversion<'a>> {
+ if let Some((from, to)) = get_types_from_cast(check, SINTS, "min_value", "MIN") {
+ Conversion::try_new(candidate, from, to)
+ } else {
+ None
+ }
+}
+
+/// Tries to extract the from- and to-type from a cast expression
+fn get_types_from_cast<'a>(
+ expr: &'a Expr<'_>,
+ types: &'a [&str],
+ func: &'a str,
+ assoc_const: &'a str,
+) -> Option<(&'a str, &'a str)> {
+ // `to_type::max_value() as from_type`
+ // or `to_type::MAX as from_type`
+ let call_from_cast: Option<(&Expr<'_>, &str)> = if_chain! {
+ // to_type::max_value(), from_type
+ if let ExprKind::Cast(limit, from_type) = &expr.kind;
+ if let TyKind::Path(ref from_type_path) = &from_type.kind;
+ if let Some(from_sym) = int_ty_to_sym(from_type_path);
+
+ then {
+ Some((limit, from_sym))
+ } else {
+ None
+ }
+ };
+
+ // `from_type::from(to_type::max_value())`
+ let limit_from: Option<(&Expr<'_>, &str)> = call_from_cast.or_else(|| {
+ if_chain! {
+ // `from_type::from, to_type::max_value()`
++ if let ExprKind::Call(from_func, [limit]) = &expr.kind;
+ // `from_type::from`
+ if let ExprKind::Path(ref path) = &from_func.kind;
+ if let Some(from_sym) = get_implementing_type(path, INTS, "from");
+
+ then {
+ Some((limit, from_sym))
+ } else {
+ None
+ }
+ }
+ });
+
+ if let Some((limit, from_type)) = limit_from {
+ match limit.kind {
+ // `from_type::from(_)`
+ ExprKind::Call(path, _) => {
+ if let ExprKind::Path(ref path) = path.kind {
+ // `to_type`
+ if let Some(to_type) = get_implementing_type(path, types, func) {
+ return Some((from_type, to_type));
+ }
+ }
+ },
+ // `to_type::MAX`
+ ExprKind::Path(ref path) => {
+ if let Some(to_type) = get_implementing_type(path, types, assoc_const) {
+ return Some((from_type, to_type));
+ }
+ },
+ _ => {},
+ }
+ };
+ None
+}
+
+/// Gets the type which implements the called function
+fn get_implementing_type<'a>(path: &QPath<'_>, candidates: &'a [&str], function: &str) -> Option<&'a str> {
+ if_chain! {
+ if let QPath::TypeRelative(ty, path) = &path;
+ if path.ident.name.as_str() == function;
+ if let TyKind::Path(QPath::Resolved(None, tp)) = &ty.kind;
+ if let [int] = tp.segments;
+ then {
+ let name = int.ident.name.as_str();
+ candidates.iter().find(|c| &name == *c).copied()
+ } else {
+ None
+ }
+ }
+}
+
+/// Gets the type as a string, if it is a supported integer
+fn int_ty_to_sym<'tcx>(path: &QPath<'_>) -> Option<&'tcx str> {
+ if_chain! {
+ if let QPath::Resolved(_, path) = *path;
+ if let [ty] = path.segments;
+ then {
+ let name = ty.ident.name.as_str();
+ INTS.iter().find(|c| &name == *c).copied()
+ } else {
+ None
+ }
+ }
+}
+
+/// Will return the expressions as if they were expr1 <= expr2
+fn normalize_le_ge<'a>(op: &BinOp, left: &'a Expr<'a>, right: &'a Expr<'a>) -> Option<(&'a Expr<'a>, &'a Expr<'a>)> {
+ match op.node {
+ BinOpKind::Le => Some((left, right)),
+ BinOpKind::Ge => Some((right, left)),
+ _ => None,
+ }
+}
+
+// Constants
+const UINTS: &[&str] = &["u8", "u16", "u32", "u64", "usize"];
+const SINTS: &[&str] = &["i8", "i16", "i32", "i64", "isize"];
+const INTS: &[&str] = &["u8", "u16", "u32", "u64", "usize", "i8", "i16", "i32", "i64", "isize"];
--- /dev/null
- if let ExprKind::Call(func, args) = expr.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet;
+use clippy_utils::{match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks usage of `std::fs::create_dir` and suggest using `std::fs::create_dir_all` instead.
+ ///
+ /// ### Why is this bad?
+ /// Sometimes `std::fs::create_dir` is mistakenly chosen over `std::fs::create_dir_all`.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// std::fs::create_dir("foo");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// std::fs::create_dir_all("foo");
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub CREATE_DIR,
+ restriction,
+ "calling `std::fs::create_dir` instead of `std::fs::create_dir_all`"
+}
+
+declare_lint_pass!(CreateDir => [CREATE_DIR]);
+
+impl LateLintPass<'_> for CreateDir {
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
- format!("create_dir_all({})", snippet(cx, args[0].span, "..")),
++ if let ExprKind::Call(func, [arg, ..]) = expr.kind;
+ if let ExprKind::Path(ref path) = func.kind;
+ if let Some(def_id) = cx.qpath_res(path, func.hir_id).opt_def_id();
+ if match_def_path(cx, def_id, &paths::STD_FS_CREATE_DIR);
+ then {
+ span_lint_and_sugg(
+ cx,
+ CREATE_DIR,
+ expr.span,
+ "calling `std::fs::create_dir` where there may be a better way",
+ "consider calling `std::fs::create_dir_all` instead",
++ format!("create_dir_all({})", snippet(cx, arg.span, "..")),
+ Applicability::MaybeIncorrect,
+ )
+ }
+ }
+ }
+}
--- /dev/null
- use clippy_utils::{any_parent_is_automatically_derived, contains_name, get_parent_expr, match_def_path, paths};
+use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_sugg};
+use clippy_utils::source::snippet_with_macro_callsite;
+use clippy_utils::ty::{has_drop, is_copy};
++use clippy_utils::{
++ any_parent_is_automatically_derived, contains_name, get_parent_expr, is_from_proc_macro, match_def_path, paths,
++};
+use if_chain::if_chain;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_errors::Applicability;
+use rustc_hir::def::Res;
+use rustc_hir::{Block, Expr, ExprKind, PatKind, QPath, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::{Ident, Symbol};
+use rustc_span::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for literal calls to `Default::default()`.
+ ///
+ /// ### Why is this bad?
+ /// It's easier for the reader if the name of the type is used, rather than the
+ /// generic `Default`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let s: String = Default::default();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let s = String::default();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DEFAULT_TRAIT_ACCESS,
+ pedantic,
+ "checks for literal calls to `Default::default()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for immediate reassignment of fields initialized
+ /// with Default::default().
+ ///
+ /// ### Why is this bad?
+ ///It's more idiomatic to use the [functional update syntax](https://doc.rust-lang.org/reference/expressions/struct-expr.html#functional-update-syntax).
+ ///
+ /// ### Known problems
+ /// Assignments to patterns that are of tuple type are not linted.
+ ///
+ /// ### Example
+ /// ```
+ /// # #[derive(Default)]
+ /// # struct A { i: i32 }
+ /// let mut a: A = Default::default();
+ /// a.i = 42;
+ /// ```
+ ///
+ /// Use instead:
+ /// ```
+ /// # #[derive(Default)]
+ /// # struct A { i: i32 }
+ /// let a = A {
+ /// i: 42,
+ /// .. Default::default()
+ /// };
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub FIELD_REASSIGN_WITH_DEFAULT,
+ style,
+ "binding initialized with Default should have its fields set in the initializer"
+}
+
+#[derive(Default)]
+pub struct Default {
+ // Spans linted by `field_reassign_with_default`.
+ reassigned_linted: FxHashSet<Span>,
+}
+
+impl_lint_pass!(Default => [DEFAULT_TRAIT_ACCESS, FIELD_REASSIGN_WITH_DEFAULT]);
+
+impl<'tcx> LateLintPass<'tcx> for Default {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ if !expr.span.from_expansion();
+ // Avoid cases already linted by `field_reassign_with_default`
+ if !self.reassigned_linted.contains(&expr.span);
+ if let ExprKind::Call(path, ..) = expr.kind;
+ if !any_parent_is_automatically_derived(cx.tcx, expr.hir_id);
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id();
+ if match_def_path(cx, def_id, &paths::DEFAULT_TRAIT_METHOD);
+ if !is_update_syntax_base(cx, expr);
+ // Detect and ignore <Foo as Default>::default() because these calls do explicitly name the type.
+ if let QPath::Resolved(None, _path) = qpath;
+ let expr_ty = cx.typeck_results().expr_ty(expr);
+ if let ty::Adt(def, ..) = expr_ty.kind();
++ if !is_from_proc_macro(cx, expr);
+ then {
+ // TODO: Work out a way to put "whatever the imported way of referencing
+ // this type in this file" rather than a fully-qualified type.
+ let replacement = format!("{}::default()", cx.tcx.def_path_str(def.did()));
+ span_lint_and_sugg(
+ cx,
+ DEFAULT_TRAIT_ACCESS,
+ expr.span,
+ &format!("calling `{}` is more clear than this expression", replacement),
+ "try",
+ replacement,
+ Applicability::Unspecified, // First resolve the TODO above
+ );
+ }
+ }
+ }
+
+ #[expect(clippy::too_many_lines)]
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &Block<'tcx>) {
+ // start from the `let mut _ = _::default();` and look at all the following
+ // statements, see if they re-assign the fields of the binding
+ let stmts_head = match block.stmts {
+ // Skip the last statement since there cannot possibly be any following statements that re-assign fields.
+ [head @ .., _] if !head.is_empty() => head,
+ _ => return,
+ };
+ for (stmt_idx, stmt) in stmts_head.iter().enumerate() {
+ // find all binding statements like `let mut _ = T::default()` where `T::default()` is the
+ // `default` method of the `Default` trait, and store statement index in current block being
+ // checked and the name of the bound variable
+ let (local, variant, binding_name, binding_type, span) = if_chain! {
+ // only take `let ...` statements
+ if let StmtKind::Local(local) = stmt.kind;
+ if let Some(expr) = local.init;
+ if !any_parent_is_automatically_derived(cx.tcx, expr.hir_id);
+ if !expr.span.from_expansion();
+ // only take bindings to identifiers
+ if let PatKind::Binding(_, binding_id, ident, _) = local.pat.kind;
+ // only when assigning `... = Default::default()`
+ if is_expr_default(expr, cx);
+ let binding_type = cx.typeck_results().node_type(binding_id);
+ if let Some(adt) = binding_type.ty_adt_def();
+ if adt.is_struct();
+ let variant = adt.non_enum_variant();
+ if adt.did().is_local() || !variant.is_field_list_non_exhaustive();
+ let module_did = cx.tcx.parent_module(stmt.hir_id).to_def_id();
+ if variant
+ .fields
+ .iter()
+ .all(|field| field.vis.is_accessible_from(module_did, cx.tcx));
+ let all_fields_are_copy = variant
+ .fields
+ .iter()
+ .all(|field| {
+ is_copy(cx, cx.tcx.type_of(field.did))
+ });
+ if !has_drop(cx, binding_type) || all_fields_are_copy;
+ then {
+ (local, variant, ident.name, binding_type, expr.span)
+ } else {
+ continue;
+ }
+ };
+
+ // find all "later statement"'s where the fields of the binding set as
+ // Default::default() get reassigned, unless the reassignment refers to the original binding
+ let mut first_assign = None;
+ let mut assigned_fields = Vec::new();
+ let mut cancel_lint = false;
+ for consecutive_statement in &block.stmts[stmt_idx + 1..] {
+ // find out if and which field was set by this `consecutive_statement`
+ if let Some((field_ident, assign_rhs)) = field_reassigned_by_stmt(consecutive_statement, binding_name) {
+ // interrupt and cancel lint if assign_rhs references the original binding
+ if contains_name(binding_name, assign_rhs) {
+ cancel_lint = true;
+ break;
+ }
+
+ // if the field was previously assigned, replace the assignment, otherwise insert the assignment
+ if let Some(prev) = assigned_fields
+ .iter_mut()
+ .find(|(field_name, _)| field_name == &field_ident.name)
+ {
+ *prev = (field_ident.name, assign_rhs);
+ } else {
+ assigned_fields.push((field_ident.name, assign_rhs));
+ }
+
+ // also set first instance of error for help message
+ if first_assign.is_none() {
+ first_assign = Some(consecutive_statement);
+ }
+ }
+ // interrupt if no field was assigned, since we only want to look at consecutive statements
+ else {
+ break;
+ }
+ }
+
+ // if there are incorrectly assigned fields, do a span_lint_and_note to suggest
+ // construction using `Ty { fields, ..Default::default() }`
+ if !assigned_fields.is_empty() && !cancel_lint {
+ // if all fields of the struct are not assigned, add `.. Default::default()` to the suggestion.
+ let ext_with_default = !variant
+ .fields
+ .iter()
+ .all(|field| assigned_fields.iter().any(|(a, _)| a == &field.name));
+
+ let field_list = assigned_fields
+ .into_iter()
+ .map(|(field, rhs)| {
+ // extract and store the assigned value for help message
+ let value_snippet = snippet_with_macro_callsite(cx, rhs.span, "..");
+ format!("{}: {}", field, value_snippet)
+ })
+ .collect::<Vec<String>>()
+ .join(", ");
+
+ // give correct suggestion if generics are involved (see #6944)
+ let binding_type = if_chain! {
+ if let ty::Adt(adt_def, substs) = binding_type.kind();
+ if !substs.is_empty();
+ then {
+ let adt_def_ty_name = cx.tcx.item_name(adt_def.did());
+ let generic_args = substs.iter().collect::<Vec<_>>();
+ let tys_str = generic_args
+ .iter()
+ .map(ToString::to_string)
+ .collect::<Vec<_>>()
+ .join(", ");
+ format!("{}::<{}>", adt_def_ty_name, &tys_str)
+ } else {
+ binding_type.to_string()
+ }
+ };
+
+ let sugg = if ext_with_default {
+ if field_list.is_empty() {
+ format!("{}::default()", binding_type)
+ } else {
+ format!("{} {{ {}, ..Default::default() }}", binding_type, field_list)
+ }
+ } else {
+ format!("{} {{ {} }}", binding_type, field_list)
+ };
+
+ // span lint once per statement that binds default
+ span_lint_and_note(
+ cx,
+ FIELD_REASSIGN_WITH_DEFAULT,
+ first_assign.unwrap().span,
+ "field assignment outside of initializer for an instance created with Default::default()",
+ Some(local.span),
+ &format!(
+ "consider initializing the variable with `{}` and removing relevant reassignments",
+ sugg
+ ),
+ );
+ self.reassigned_linted.insert(span);
+ }
+ }
+ }
+}
+
+/// Checks if the given expression is the `default` method belonging to the `Default` trait.
+fn is_expr_default<'tcx>(expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> bool {
+ if_chain! {
+ if let ExprKind::Call(fn_expr, _) = &expr.kind;
+ if let ExprKind::Path(qpath) = &fn_expr.kind;
+ if let Res::Def(_, def_id) = cx.qpath_res(qpath, fn_expr.hir_id);
+ then {
+ // right hand side of assignment is `Default::default`
+ match_def_path(cx, def_id, &paths::DEFAULT_TRAIT_METHOD)
+ } else {
+ false
+ }
+ }
+}
+
+/// Returns the reassigned field and the assigning expression (right-hand side of assign).
+fn field_reassigned_by_stmt<'tcx>(this: &Stmt<'tcx>, binding_name: Symbol) -> Option<(Ident, &'tcx Expr<'tcx>)> {
+ if_chain! {
+ // only take assignments
+ if let StmtKind::Semi(later_expr) = this.kind;
+ if let ExprKind::Assign(assign_lhs, assign_rhs, _) = later_expr.kind;
+ // only take assignments to fields where the left-hand side field is a field of
+ // the same binding as the previous statement
+ if let ExprKind::Field(binding, field_ident) = assign_lhs.kind;
+ if let ExprKind::Path(QPath::Resolved(_, path)) = binding.kind;
+ if let Some(second_binding_name) = path.segments.last();
+ if second_binding_name.ident.name == binding_name;
+ then {
+ Some((field_ident, assign_rhs))
+ } else {
+ None
+ }
+ }
+}
+
+/// Returns whether `expr` is the update syntax base: `Foo { a: 1, .. base }`
+fn is_update_syntax_base<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+ if_chain! {
+ if let Some(parent) = get_parent_expr(cx, expr);
+ if let ExprKind::Struct(_, _, Some(base)) = parent.kind;
+ then {
+ base.hir_id == expr.hir_id
+ } else {
+ false
+ }
+ }
+}
--- /dev/null
- use clippy_utils::ty::{expr_sig, peel_mid_ty_refs, variant_of_res};
+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 rustc_middle::ty::{self, Ty, TyCtxt, TypeVisitable, TypeckResults};
++use clippy_utils::ty::{expr_sig, peel_mid_ty_refs, ty_sig, 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_span::{symbol::sym, Span, Symbol};
++use rustc_middle::ty::{self, Binder, BoundVariableKind, List, Ty, TyCtxt, TypeVisitable, TypeckResults};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
- // Span and id of the top-level deref expression if the parent expression is a borrow.
- deref_span_id: Option<(Span, HirId)>,
++use rustc_span::{symbol::sym, Span, Symbol, DUMMY_SP};
+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 {
- deref_span: Span,
- deref_hir_id: HirId,
++ mutability: Option<Mutability>,
+ },
+ ExplicitDerefField {
+ name: Symbol,
+ },
+ Reborrow {
- Borrow,
++ mutability: Mutability,
++ },
++ Borrow {
++ mutability: Mutability,
+ },
- AddrOf,
+}
+
+// A reference operation considered by this lint pass
+enum RefOp {
+ Method(Mutability),
+ Deref,
- State::ExplicitDeref { deref_span_id: None },
++ AddrOf(Mutability),
+}
+
+struct RefPat {
+ /// Whether every usage of the binding is dereferenced.
+ always_deref: bool,
+ /// The spans of all the ref bindings for this local.
+ spans: Vec<Span>,
+ /// The applicability of this suggestion.
+ app: Applicability,
+ /// All the replacements which need to be made.
+ replacements: Vec<(Span, String)>,
+ /// The [`HirId`] that the lint should be emitted at.
+ hir_id: HirId,
+}
+
+impl<'tcx> LateLintPass<'tcx> for Dereferencing {
+ #[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((
- RefOp::AddrOf => {
++ State::ExplicitDeref { mutability: None },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ }
+ }
+ RefOp::Method(target_mut)
+ if !is_lint_allowed(cx, EXPLICIT_DEREF_METHODS, expr.hir_id)
+ && position.lint_explicit_deref() =>
+ {
+ 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
+ },
+ ));
+ },
- } else if position.is_deref_stable() {
++ RefOp::AddrOf(mutability) => {
+ // Find the number of times the borrow is auto-derefed.
+ let mut iter = adjustments.iter();
+ let mut deref_count = 0usize;
+ let next_adjust = loop {
+ match iter.next() {
+ Some(adjust) => {
+ if !matches!(adjust.kind, Adjust::Deref(_)) {
+ break Some(adjust);
+ } else if !adjust.target.is_ref() {
+ deref_count += 1;
+ break iter.next();
+ }
+ deref_count += 1;
+ },
+ None => break None,
+ };
+ };
+
+ // Determine the required number of references before any can be removed. In all cases the
+ // reference made by the current expression will be removed. After that there are four cases to
+ // handle.
+ //
+ // 1. Auto-borrow will trigger in the current position, so no further references are required.
+ // 2. Auto-deref ends at a reference, or the underlying type, so one extra needs to be left to
+ // handle the automatically inserted re-borrow.
+ // 3. Auto-deref hits a user-defined `Deref` impl, so at least one reference needs to exist to
+ // start auto-deref.
+ // 4. If the chain of non-user-defined derefs ends with a mutable re-borrow, and re-borrow
+ // adjustments will not be inserted automatically, then leave one further reference to avoid
+ // moving a mutable borrow.
+ // e.g.
+ // fn foo<T>(x: &mut Option<&mut T>, y: &mut T) {
+ // let x = match x {
+ // // Removing the borrow will cause `x` to be moved
+ // Some(x) => &mut *x,
+ // None => y
+ // };
+ // }
+ let deref_msg =
+ "this expression creates a reference which is immediately dereferenced by the compiler";
+ let borrow_msg = "this expression borrows a value the compiler would automatically borrow";
+
+ let (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 },
+ ));
- State::Borrow,
++ } else if position.is_deref_stable()
++ // Auto-deref doesn't combine with other adjustments
++ && next_adjust.map_or(true, |a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
++ && iter.all(|a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
++ {
+ self.state = Some((
- (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf) if state.count != 0 => {
++ State::Borrow { mutability },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position
+ },
+ ));
+ }
+ },
+ RefOp::Method(..) => (),
+ }
+ },
+ (
+ Some((
+ State::DerefMethod {
+ target_mut,
+ ty_changed_count,
+ ..
+ },
+ data,
+ )),
+ RefOp::Method(_),
+ ) => {
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count: if deref_method_same_type(typeck.expr_ty(expr), typeck.expr_ty(sub_expr)) {
+ ty_changed_count
+ } else {
+ ty_changed_count + 1
+ },
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
+ target_mut,
+ },
+ data,
+ ));
+ },
- (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf) => {
++ (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf(_)) if state.count != 0 => {
+ self.state = Some((
+ State::DerefedBorrow(DerefedBorrow {
+ count: state.count - 1,
+ ..state
+ }),
+ data,
+ ));
+ },
- State::Borrow,
++ (Some((State::DerefedBorrow(state), data)), RefOp::AddrOf(mutability)) => {
+ let position = data.position;
+ report(cx, expr, State::DerefedBorrow(state), data);
+ if position.is_deref_stable() {
+ self.state = Some((
- State::ExplicitDeref { deref_span_id: None },
++ State::Borrow { mutability },
+ StateData {
+ span: expr.span,
+ hir_id: expr.hir_id,
+ position,
+ },
+ ));
+ }
+ },
+ (Some((State::DerefedBorrow(state), data)), RefOp::Deref) => {
+ let position = data.position;
+ report(cx, expr, State::DerefedBorrow(state), data);
+ if let Position::FieldAccess(name) = position
+ && !ty_contains_field(typeck.expr_ty(sub_expr), name)
+ {
+ self.state = Some((
+ State::ExplicitDerefField { name },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ } else if position.is_deref_stable() {
+ self.state = Some((
- (Some((State::Borrow, data)), RefOp::Deref) => {
++ State::ExplicitDeref { mutability: None },
+ StateData { span: expr.span, hir_id: expr.hir_id, position },
+ ));
+ }
+ },
+
- self.state = Some((
- State::Reborrow {
- deref_span: expr.span,
- deref_hir_id: expr.hir_id,
- },
- data,
- ));
++ (Some((State::Borrow { mutability }, data)), RefOp::Deref) => {
+ if typeck.expr_ty(sub_expr).is_ref() {
- deref_span_id: Some((expr.span, expr.hir_id)),
++ self.state = Some((State::Reborrow { mutability }, data));
+ } else {
+ self.state = Some((
+ State::ExplicitDeref {
- (
- Some((
- State::Reborrow {
- deref_span,
- deref_hir_id,
- },
- data,
- )),
- RefOp::Deref,
- ) => {
++ mutability: Some(mutability),
+ },
+ data,
+ ));
+ }
+ },
- deref_span_id: Some((deref_span, deref_hir_id)),
++ (Some((State::Reborrow { mutability }, data)), RefOp::Deref) => {
+ self.state = Some((
+ State::ExplicitDeref {
- ExprKind::AddrOf(BorrowKind::Ref, _, sub_expr) => return Some((RefOp::AddrOf, sub_expr)),
++ mutability: Some(mutability),
+ },
+ data,
+ ));
+ },
+ (state @ Some((State::ExplicitDeref { .. }, _)), RefOp::Deref) => {
+ self.state = state;
+ },
+ (Some((State::ExplicitDerefField { name }, data)), RefOp::Deref)
+ if !ty_contains_field(typeck.expr_ty(sub_expr), name) =>
+ {
+ self.state = Some((State::ExplicitDerefField { name }, data));
+ },
+
+ (Some((state, data)), _) => report(cx, expr, state, data),
+ }
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ if let PatKind::Binding(BindingAnnotation::Ref, id, name, _) = pat.kind {
+ if let Some(opt_prev_pat) = self.ref_locals.get_mut(&id) {
+ // This binding id has been seen before. Add this pattern to the list of changes.
+ if let Some(prev_pat) = opt_prev_pat {
+ if pat.span.from_expansion() {
+ // Doesn't match the context of the previous pattern. Can't lint here.
+ *opt_prev_pat = None;
+ } else {
+ prev_pat.spans.push(pat.span);
+ prev_pat.replacements.push((
+ pat.span,
+ snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut prev_pat.app)
+ .0
+ .into(),
+ ));
+ }
+ }
+ return;
+ }
+
+ if_chain! {
+ if !pat.span.from_expansion();
+ if let ty::Ref(_, tam, _) = *cx.typeck_results().pat_ty(pat).kind();
+ // only lint immutable refs, because borrowed `&mut T` cannot be moved out
+ if let ty::Ref(_, _, Mutability::Not) = *tam.kind();
+ then {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut app).0;
+ self.current_body = self.current_body.or(cx.enclosing_body);
+ self.ref_locals.insert(
+ id,
+ Some(RefPat {
+ always_deref: true,
+ spans: vec![pat.span],
+ app,
+ replacements: vec![(pat.span, snip.into())],
+ hir_id: pat.hir_id
+ }),
+ );
+ }
+ }
+ }
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
+ if 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));
+ },
- DerefStable(i8),
++ ExprKind::AddrOf(BorrowKind::Ref, mutability, sub_expr) => return Some((RefOp::AddrOf(mutability), sub_expr)),
+ _ => return None,
+ };
+ if tcx.is_diagnostic_item(sym::deref_method, def_id) {
+ Some((RefOp::Method(Mutability::Not), arg))
+ } else if tcx.trait_of_item(def_id)? == tcx.lang_items().deref_mut_trait()? {
+ Some((RefOp::Method(Mutability::Mut), arg))
+ } else {
+ None
+ }
+}
+
+// Checks whether the type for a deref call actually changed the type, not just the mutability of
+// the reference.
+fn deref_method_same_type<'tcx>(result_ty: Ty<'tcx>, arg_ty: Ty<'tcx>) -> bool {
+ match (result_ty.kind(), arg_ty.kind()) {
+ (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => result_ty == arg_ty,
+
+ // The result type for a deref method is always a reference
+ // Not matching the previous pattern means the argument type is not a reference
+ // This means that the type did change
+ _ => false,
+ }
+}
+
+/// The position of an expression relative to it's parent.
+#[derive(Clone, Copy)]
+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.
- matches!(self, Self::DerefStable(_))
++ /// Contains the precedence of the parent expression and whether the target type is sized.
++ DerefStable(i8, bool),
+ /// Any other location which will trigger auto-reborrowing.
++ /// Contains the precedence of the parent expression.
+ ReborrowStable(i8),
++ /// Contains the precedence of the parent expression.
+ Other(i8),
+}
+impl Position {
+ fn is_deref_stable(self) -> bool {
- matches!(self, Self::DerefStable(_) | Self::ReborrowStable(_))
++ matches!(self, Self::DerefStable(..))
+ }
+
+ fn is_reborrow_stable(self) -> bool {
- matches!(self, Self::Other(_) | Self::DerefStable(_) | Self::ReborrowStable(_))
++ 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 {
- Self::DerefStable(p) | Self::ReborrowStable(p) | Self::Other(p) => p,
++ 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,
- Some(binding_ty_auto_deref_stability(ty, precedence))
++ 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(if ty.is_ref() {
- Position::DerefStable(precedence)
- } else {
- Position::Other(precedence)
- })
++ Some(binding_ty_auto_deref_stability(cx, ty, precedence, List::empty()))
+ },
+ Node::Item(&Item {
+ kind: ItemKind::Static(..) | ItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
+ let ty = cx.tcx.type_of(def_id);
- 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)
- })
++ Some(ty_auto_deref_stability(cx, ty, precedence).position_for_result(cx))
+ },
+
+ Node::Item(&Item {
+ kind: ItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(..),
+ def_id,
+ span,
+ ..
+ }) if span.ctxt() == ctxt => {
- if let Node::Expr(Expr {
- kind: ExprKind::Closure(&Closure { fn_decl, .. }),
- ..
- }) = cx.tcx.hir().get(owner_id)
++ let output = cx
++ .tcx
++ .erase_late_bound_regions(cx.tcx.fn_sig(def_id.to_def_id()).output());
++ Some(ty_auto_deref_stability(cx, output, precedence).position_for_result(cx))
+ },
+
+ Node::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(
- match fn_decl.output {
- FnRetTy::Return(ty) => binding_ty_auto_deref_stability(ty, precedence),
- FnRetTy::DefaultReturn(_) => Position::Other(precedence),
- }
++ if let Node::Expr(
++ closure_expr @ Expr {
++ kind: ExprKind::Closure(closure),
++ ..
++ },
++ ) = cx.tcx.hir().get(owner_id)
+ {
- .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)
- }
++ closure_result_position(cx, closure, cx.typeck_results().expr_ty(closure_expr), precedence)
+ } else {
+ let output = cx
+ .tcx
- Some(ty) => binding_ty_auto_deref_stability(ty, precedence),
- None => param_auto_deref_stability(ty.skip_binder(), precedence),
++ .erase_late_bound_regions(cx.tcx.fn_sig(cx.tcx.hir().local_def_id(owner_id)).output());
++ ty_auto_deref_stability(cx, output, precedence).position_for_result(cx)
+ },
+ )
+ },
++ ExprKind::Closure(closure) => Some(closure_result_position(
++ cx,
++ closure,
++ cx.typeck_results().expr_ty(parent),
++ precedence,
++ )),
+ ExprKind::Call(func, _) if func.hir_id == child_id => {
+ (child_id == e.hir_id).then_some(Position::Callee)
+ },
+ ExprKind::Call(func, args) => args
+ .iter()
+ .position(|arg| arg.hir_id == child_id)
+ .zip(expr_sig(cx, func))
+ .and_then(|(i, sig)| sig.input_with_hir(i))
+ .map(|(hir_ty, ty)| match hir_ty {
+ // Type inference for closures can depend on how they're called. Only go by the explicit
+ // types here.
- param_auto_deref_stability(cx.tcx.fn_sig(id).skip_binder().inputs()[i], precedence)
++ Some(hir_ty) => binding_ty_auto_deref_stability(cx, hir_ty, precedence, ty.bound_vars()),
++ None => ty_auto_deref_stability(cx, cx.tcx.erase_late_bound_regions(ty), precedence)
++ .position_for_arg(),
+ }),
+ 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 {
- .map(|field| param_auto_deref_stability(cx.tcx.type_of(field.did), precedence))
++ ty_auto_deref_stability(
++ cx,
++ cx.tcx.erase_late_bound_regions(cx.tcx.fn_sig(id).input(i)),
++ precedence,
++ )
++ .position_for_arg()
+ }
+ })
+ },
+ 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))
- fn binding_ty_auto_deref_stability(ty: &hir::Ty<'_>, precedence: i8) -> Position {
++ .map(|field| {
++ ty_auto_deref_stability(cx, cx.tcx.type_of(field.did), precedence).position_for_arg()
++ })
+ },
+ 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)
+}
+
++fn closure_result_position<'tcx>(
++ cx: &LateContext<'tcx>,
++ closure: &'tcx Closure<'_>,
++ ty: Ty<'tcx>,
++ precedence: i8,
++) -> Position {
++ match closure.fn_decl.output {
++ FnRetTy::Return(hir_ty) => {
++ if let Some(sig) = ty_sig(cx, ty)
++ && let Some(output) = sig.output()
++ {
++ binding_ty_auto_deref_stability(cx, hir_ty, precedence, output.bound_vars())
++ } else {
++ Position::Other(precedence)
++ }
++ },
++ FnRetTy::DefaultReturn(_) => Position::Other(precedence),
++ }
++}
++
+// Checks the stability of auto-deref when assigned to a binding with the given explicit type.
+//
+// e.g.
+// let x = Box::new(Box::new(0u32));
+// let y1: &Box<_> = x.deref();
+// let y2: &Box<_> = &x;
+//
+// Here `y1` and `y2` would resolve to different types, so the type `&Box<_>` is not stable when
+// switching to auto-dereferencing.
- Position::DerefStable(precedence)
++fn binding_ty_auto_deref_stability<'tcx>(
++ cx: &LateContext<'tcx>,
++ ty: &'tcx hir::Ty<'_>,
++ precedence: i8,
++ binder_args: &'tcx List<BoundVariableKind>,
++) -> Position {
+ let TyKind::Rptr(_, ty) = &ty.kind else {
+ return Position::Other(precedence);
+ };
+ let mut ty = ty;
+
+ loop {
+ break match ty.ty.kind {
+ TyKind::Rptr(_, ref ref_ty) => {
+ ty = ref_ty;
+ continue;
+ },
+ TyKind::Path(
+ QPath::TypeRelative(_, path)
+ | QPath::Resolved(
+ _,
+ Path {
+ segments: [.., path], ..
+ },
+ ),
+ ) => {
+ if let Some(args) = path.args
+ && args.args.iter().any(|arg| match arg {
+ GenericArg::Infer(_) => true,
+ GenericArg::Type(ty) => ty_contains_infer(ty),
+ _ => false,
+ })
+ {
+ Position::ReborrowStable(precedence)
+ } else {
- TyKind::Slice(_)
- | TyKind::Array(..)
- | TyKind::BareFn(_)
- | TyKind::Never
++ Position::DerefStable(
++ precedence,
++ cx.tcx
++ .erase_late_bound_regions(Binder::bind_with_vars(
++ cx.typeck_results().node_type(ty.ty.hir_id),
++ binder_args,
++ ))
++ .is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
++ )
+ }
+ },
- | TyKind::Ptr(_)
- | TyKind::TraitObject(..)
- | TyKind::Path(_) => Position::DerefStable(precedence),
- TyKind::OpaqueDef(..)
- | TyKind::Infer
- | TyKind::Typeof(..)
- | TyKind::Err => Position::ReborrowStable(precedence),
++ TyKind::Slice(_) => Position::DerefStable(precedence, false),
++ TyKind::Array(..) | TyKind::Ptr(_) | TyKind::BareFn(_) => Position::DerefStable(precedence, true),
++ TyKind::Never
+ | TyKind::Tup(_)
- fn param_auto_deref_stability(ty: Ty<'_>, precedence: i8) -> Position {
++ | TyKind::Path(_) => Position::DerefStable(
++ precedence,
++ cx.tcx
++ .erase_late_bound_regions(Binder::bind_with_vars(
++ cx.typeck_results().node_type(ty.ty.hir_id),
++ binder_args,
++ ))
++ .is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
++ ),
++ TyKind::OpaqueDef(..) | TyKind::Infer | TyKind::Typeof(..) | TyKind::TraitObject(..) | TyKind::Err => {
++ Position::ReborrowStable(precedence)
++ },
+ };
+ }
+}
+
+// Checks whether a type is inferred at some point.
+// e.g. `_`, `Box<_>`, `[_]`
+fn ty_contains_infer(ty: &hir::Ty<'_>) -> bool {
+ struct V(bool);
+ impl Visitor<'_> for V {
+ fn visit_ty(&mut self, ty: &hir::Ty<'_>) {
+ if self.0
+ || matches!(
+ ty.kind,
+ TyKind::OpaqueDef(..) | TyKind::Infer | TyKind::Typeof(_) | TyKind::Err
+ )
+ {
+ self.0 = true;
+ } else {
+ walk_ty(self, ty);
+ }
+ }
+
+ fn visit_generic_arg(&mut self, arg: &GenericArg<'_>) {
+ if self.0 || matches!(arg, GenericArg::Infer(_)) {
+ self.0 = true;
+ } else if let GenericArg::Type(ty) = arg {
+ self.visit_ty(ty);
+ }
+ }
+ }
+ let mut v = V(false);
+ v.visit_ty(ty);
+ v.0
+}
+
++struct TyPosition<'tcx> {
++ position: Position,
++ ty: Option<Ty<'tcx>>,
++}
++impl From<Position> for TyPosition<'_> {
++ fn from(position: Position) -> Self {
++ Self { position, ty: None }
++ }
++}
++impl<'tcx> TyPosition<'tcx> {
++ fn new_deref_stable_for_result(precedence: i8, ty: Ty<'tcx>) -> Self {
++ Self {
++ position: Position::ReborrowStable(precedence),
++ ty: Some(ty),
++ }
++ }
++ fn position_for_result(self, cx: &LateContext<'tcx>) -> Position {
++ match (self.position, self.ty) {
++ (Position::ReborrowStable(precedence), Some(ty)) => {
++ Position::DerefStable(precedence, ty.is_sized(cx.tcx.at(DUMMY_SP), cx.param_env))
++ },
++ (position, _) => position,
++ }
++ }
++ fn position_for_arg(self) -> Position {
++ self.position
++ }
++}
++
+// Checks whether a type is stable when switching to auto dereferencing,
- return Position::Other(precedence);
++fn ty_auto_deref_stability<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, precedence: i8) -> TyPosition<'tcx> {
+ let ty::Ref(_, mut ty, _) = *ty.kind() else {
- 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)
++ return Position::Other(precedence).into();
+ };
+
+ loop {
+ break match *ty.kind() {
+ ty::Ref(_, ref_ty, _) => {
+ ty = ref_ty;
+ continue;
+ },
- ty::Adt(..)
- | ty::Bool
++ ty::Param(_) => TyPosition::new_deref_stable_for_result(precedence, ty),
++ ty::Infer(_) | ty::Error(_) | ty::Bound(..) | ty::Opaque(..) | ty::Placeholder(_) | ty::Dynamic(..) => {
++ Position::ReborrowStable(precedence).into()
+ },
- | ty::Float(_)
- | ty::Foreign(_)
- | ty::Str
++ ty::Adt(..) if ty.has_placeholders() || ty.has_opaque_types() => {
++ Position::ReborrowStable(precedence).into()
++ },
++ ty::Adt(_, substs) if substs.has_param_types_or_consts() => {
++ TyPosition::new_deref_stable_for_result(precedence, ty)
++ },
++ ty::Bool
+ | ty::Char
+ | ty::Int(_)
+ | ty::Uint(_)
- | ty::Slice(..)
+ | ty::Array(..)
- | ty::FnPtr(_)
- | ty::Closure(..)
++ | ty::Float(_)
+ | ty::RawPtr(..)
++ | ty::FnPtr(_) => Position::DerefStable(precedence, true).into(),
++ ty::Str | ty::Slice(..) => Position::DerefStable(precedence, false).into(),
++ ty::Adt(..)
++ | ty::Foreign(_)
+ | ty::FnDef(..)
- | ty::Projection(_) => Position::DerefStable(precedence),
+ | ty::Generator(..)
+ | ty::GeneratorWitness(..)
++ | ty::Closure(..)
+ | ty::Never
+ | ty::Tuple(_)
- State::ExplicitDeref { deref_span_id } => {
- let (span, hir_id, precedence) = if let Some((span, hir_id)) = deref_span_id
++ | ty::Projection(_) => Position::DerefStable(
++ precedence,
++ ty.is_sized(cx.tcx.at(DUMMY_SP), cx.param_env.without_caller_bounds()),
++ )
++ .into(),
+ };
+ }
+}
+
+fn ty_contains_field(ty: Ty<'_>, name: Symbol) -> bool {
+ if let ty::Adt(adt, _) = *ty.kind() {
+ adt.is_struct() && adt.all_fields().any(|f| f.name == name)
+ } else {
+ false
+ }
+}
+
+#[expect(clippy::needless_pass_by_value, clippy::too_many_lines)]
+fn report<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, state: State, data: StateData) {
+ match state {
+ State::DerefMethod {
+ ty_changed_count,
+ is_final_ufcs,
+ target_mut,
+ } => {
+ let mut app = Applicability::MachineApplicable;
+ let (expr_str, expr_is_macro_call) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
+ let ty = cx.typeck_results().expr_ty(expr);
+ let (_, ref_count) = peel_mid_ty_refs(ty);
+ let deref_str = if ty_changed_count >= ref_count && ref_count != 0 {
+ // a deref call changing &T -> &U requires two deref operators the first time
+ // this occurs. One to remove the reference, a second to call the deref impl.
+ "*".repeat(ty_changed_count + 1)
+ } else {
+ "*".repeat(ty_changed_count)
+ };
+ let addr_of_str = if ty_changed_count < ref_count {
+ // Check if a reborrow from &mut T -> &T is required.
+ if target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
+ "&*"
+ } else {
+ ""
+ }
+ } else if target_mut == Mutability::Mut {
+ "&mut "
+ } else {
+ "&"
+ };
+
+ let expr_str = if !expr_is_macro_call && is_final_ufcs && expr.precedence().order() < PREC_PREFIX {
+ format!("({})", expr_str)
+ } else {
+ expr_str.into_owned()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ EXPLICIT_DEREF_METHODS,
+ data.span,
+ match target_mut {
+ Mutability::Not => "explicit `deref` method call",
+ Mutability::Mut => "explicit `deref_mut` method call",
+ },
+ "try this",
+ format!("{}{}{}", addr_of_str, deref_str, expr_str),
+ app,
+ );
+ },
+ State::DerefedBorrow(state) => {
+ let mut app = Applicability::MachineApplicable;
+ let (snip, 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);
+ });
+ },
- (span, hir_id, PREC_PREFIX)
++ State::ExplicitDeref { mutability } => {
++ if matches!(
++ expr.kind,
++ ExprKind::Block(..)
++ | ExprKind::ConstBlock(_)
++ | ExprKind::If(..)
++ | ExprKind::Loop(..)
++ | ExprKind::Match(..)
++ ) && matches!(data.position, Position::DerefStable(_, true))
++ {
++ // Rustc bug: auto deref doesn't work on block expression when targeting sized types.
++ return;
++ }
++
++ let (prefix, precedence) = if let Some(mutability) = mutability
+ && !cx.typeck_results().expr_ty(expr).is_ref()
+ {
- (data.span, data.hir_id, data.position.precedence())
++ let prefix = match mutability {
++ Mutability::Not => "&",
++ Mutability::Mut => "&mut ",
++ };
++ (prefix, 0)
+ } else {
- hir_id,
- span,
++ ("", data.position.precedence())
+ };
+ span_lint_hir_and_then(
+ cx,
+ EXPLICIT_AUTO_DEREF,
- let (snip, snip_is_macro) = snippet_with_context(cx, expr.span, span.ctxt(), "..", &mut app);
++ data.hir_id,
++ data.span,
+ "deref which would be done by auto-deref",
+ |diag| {
+ let mut app = Applicability::MachineApplicable;
- format!("({})", snip)
++ let (snip, snip_is_macro) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
+ let sugg =
+ if !snip_is_macro && expr.precedence().order() < precedence && !has_enclosing_paren(&snip) {
- snip.into()
++ format!("{}({})", prefix, snip)
+ } else {
- diag.span_suggestion(span, "try this", sugg, app);
++ format!("{}{}", prefix, snip)
+ };
- State::Borrow | State::Reborrow { .. } => (),
++ diag.span_suggestion(data.span, "try this", sugg, app);
+ },
+ );
+ },
+ State::ExplicitDerefField { .. } => {
++ if matches!(
++ expr.kind,
++ ExprKind::Block(..)
++ | ExprKind::ConstBlock(_)
++ | ExprKind::If(..)
++ | ExprKind::Loop(..)
++ | ExprKind::Match(..)
++ ) && matches!(data.position, Position::DerefStable(_, true))
++ {
++ // Rustc bug: auto deref doesn't work on block expression when targeting sized types.
++ return;
++ }
++
+ span_lint_hir_and_then(
+ cx,
+ EXPLICIT_AUTO_DEREF,
+ data.hir_id,
+ data.span,
+ "deref which would be done by auto-deref",
+ |diag| {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app).0;
+ diag.span_suggestion(data.span, "try this", snip.into_owned(), app);
+ },
+ );
+ },
++ State::Borrow { .. } | State::Reborrow { .. } => (),
+ }
+}
+
+impl 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
--- /dev/null
++use clippy_utils::{diagnostics::span_lint, is_test_module_or_function};
++use rustc_data_structures::fx::FxHashSet;
++use rustc_hir::{Item, Pat, PatKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_tool_lint, impl_lint_pass};
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Checks for usage of disallowed names for variables, such
++ /// as `foo`.
++ ///
++ /// ### Why is this bad?
++ /// These names are usually placeholder names and should be
++ /// avoided.
++ ///
++ /// ### Example
++ /// ```rust
++ /// let foo = 3.14;
++ /// ```
++ #[clippy::version = "pre 1.29.0"]
++ pub DISALLOWED_NAMES,
++ style,
++ "usage of a disallowed/placeholder name"
++}
++
++#[derive(Clone, Debug)]
++pub struct DisallowedNames {
++ disallow: FxHashSet<String>,
++ test_modules_deep: u32,
++}
++
++impl DisallowedNames {
++ pub fn new(disallow: FxHashSet<String>) -> Self {
++ Self {
++ disallow,
++ test_modules_deep: 0,
++ }
++ }
++
++ fn in_test_module(&self) -> bool {
++ self.test_modules_deep != 0
++ }
++}
++
++impl_lint_pass!(DisallowedNames => [DISALLOWED_NAMES]);
++
++impl<'tcx> LateLintPass<'tcx> for DisallowedNames {
++ fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
++ if is_test_module_or_function(cx.tcx, item) {
++ self.test_modules_deep = self.test_modules_deep.saturating_add(1);
++ }
++ }
++
++ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
++ // Check whether we are under the `test` attribute.
++ if self.in_test_module() {
++ return;
++ }
++
++ if let PatKind::Binding(.., ident, _) = pat.kind {
++ if self.disallow.contains(&ident.name.to_string()) {
++ span_lint(
++ cx,
++ DISALLOWED_NAMES,
++ ident.span,
++ &format!("use of a disallowed/placeholder name `{}`", ident.name),
++ );
++ }
++ }
++ }
++
++ fn check_item_post(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
++ if is_test_module_or_function(cx.tcx, item) {
++ self.test_modules_deep = self.test_modules_deep.saturating_sub(1);
++ }
++ }
++}
--- /dev/null
- if let ExprKind::If(cond_expr, ..) = &first.kind;
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_note};
++use clippy_utils::is_span_if;
+use clippy_utils::source::snippet_opt;
+use if_chain::if_chain;
+use rustc_ast::ast::{BinOpKind, Block, Expr, ExprKind, StmtKind, UnOp};
+use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of the non-existent `=*`, `=!` and `=-`
+ /// operators.
+ ///
+ /// ### Why is this bad?
+ /// This is either a typo of `*=`, `!=` or `-=` or
+ /// confusing.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// a =- 42; // confusing, should it be `a -= 42` or `a = -42`?
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ suspicious,
+ "suspicious formatting of `*=`, `-=` or `!=`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks the formatting of a unary operator on the right hand side
+ /// of a binary operator. It lints if there is no space between the binary and unary operators,
+ /// but there is a space between the unary and its operand.
+ ///
+ /// ### Why is this bad?
+ /// This is either a typo in the binary operator or confusing.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = true;
+ /// # let bar = false;
+ /// // &&! looks like a different operator
+ /// if foo &&! bar {}
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let foo = true;
+ /// # let bar = false;
+ /// if foo && !bar {}
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub SUSPICIOUS_UNARY_OP_FORMATTING,
+ suspicious,
+ "suspicious formatting of unary `-` or `!` on the RHS of a BinOp"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for formatting of `else`. It lints if the `else`
+ /// is followed immediately by a newline or the `else` seems to be missing.
+ ///
+ /// ### Why is this bad?
+ /// This is probably some refactoring remnant, even if the
+ /// code is correct, it might look confusing.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// if foo {
+ /// } { // looks like an `else` is missing here
+ /// }
+ ///
+ /// if foo {
+ /// } if bar { // looks like an `else` is missing here
+ /// }
+ ///
+ /// if foo {
+ /// } else
+ ///
+ /// { // this is the `else` block of the previous `if`, but should it be?
+ /// }
+ ///
+ /// if foo {
+ /// } else
+ ///
+ /// if bar { // this is the `else` block of the previous `if`, but should it be?
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SUSPICIOUS_ELSE_FORMATTING,
+ suspicious,
+ "suspicious formatting of `else`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for possible missing comma in an array. It lints if
+ /// an array element is a binary operator expression and it lies on two lines.
+ ///
+ /// ### Why is this bad?
+ /// This could lead to unexpected results.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let a = &[
+ /// -1, -2, -3 // <= no comma here
+ /// -4, -5, -6
+ /// ];
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub POSSIBLE_MISSING_COMMA,
+ correctness,
+ "possible missing comma in array"
+}
+
+declare_lint_pass!(Formatting => [
+ SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ SUSPICIOUS_UNARY_OP_FORMATTING,
+ SUSPICIOUS_ELSE_FORMATTING,
+ POSSIBLE_MISSING_COMMA
+]);
+
+impl EarlyLintPass for Formatting {
+ fn check_block(&mut self, cx: &EarlyContext<'_>, block: &Block) {
+ for w in block.stmts.windows(2) {
+ if let (StmtKind::Expr(first), StmtKind::Expr(second) | StmtKind::Semi(second)) = (&w[0].kind, &w[1].kind) {
+ check_missing_else(cx, first, second);
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
+ check_assign(cx, expr);
+ check_unop(cx, expr);
+ check_else(cx, expr);
+ check_array(cx, expr);
+ }
+}
+
+/// Implementation of the `SUSPICIOUS_ASSIGNMENT_FORMATTING` lint.
+fn check_assign(cx: &EarlyContext<'_>, expr: &Expr) {
+ if let ExprKind::Assign(ref lhs, ref rhs, _) = expr.kind {
+ if !lhs.span.from_expansion() && !rhs.span.from_expansion() {
+ let eq_span = lhs.span.between(rhs.span);
+ if let ExprKind::Unary(op, ref sub_rhs) = rhs.kind {
+ if let Some(eq_snippet) = snippet_opt(cx, eq_span) {
+ let op = UnOp::to_string(op);
+ let eqop_span = lhs.span.between(sub_rhs.span);
+ if eq_snippet.ends_with('=') {
+ span_lint_and_note(
+ cx,
+ SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ eqop_span,
+ &format!(
+ "this looks like you are trying to use `.. {op}= ..`, but you \
+ really are doing `.. = ({op} ..)`",
+ op = op
+ ),
+ None,
+ &format!("to remove this lint, use either `{op}=` or `= {op}`", op = op),
+ );
+ }
+ }
+ }
+ }
+ }
+}
+
+/// Implementation of the `SUSPICIOUS_UNARY_OP_FORMATTING` lint.
+fn check_unop(cx: &EarlyContext<'_>, expr: &Expr) {
+ if_chain! {
+ if let ExprKind::Binary(ref binop, ref lhs, ref rhs) = expr.kind;
+ if !lhs.span.from_expansion() && !rhs.span.from_expansion();
+ // span between BinOp LHS and RHS
+ let binop_span = lhs.span.between(rhs.span);
+ // if RHS is an UnOp
+ if let ExprKind::Unary(op, ref un_rhs) = rhs.kind;
+ // from UnOp operator to UnOp operand
+ let unop_operand_span = rhs.span.until(un_rhs.span);
+ if let Some(binop_snippet) = snippet_opt(cx, binop_span);
+ if let Some(unop_operand_snippet) = snippet_opt(cx, unop_operand_span);
+ let binop_str = BinOpKind::to_string(&binop.node);
+ // no space after BinOp operator and space after UnOp operator
+ if binop_snippet.ends_with(binop_str) && unop_operand_snippet.ends_with(' ');
+ then {
+ let unop_str = UnOp::to_string(op);
+ let eqop_span = lhs.span.between(un_rhs.span);
+ span_lint_and_help(
+ cx,
+ SUSPICIOUS_UNARY_OP_FORMATTING,
+ eqop_span,
+ &format!(
+ "by not having a space between `{binop}` and `{unop}` it looks like \
+ `{binop}{unop}` is a single operator",
+ binop = binop_str,
+ unop = unop_str
+ ),
+ None,
+ &format!(
+ "put a space between `{binop}` and `{unop}` and remove the space after `{unop}`",
+ binop = binop_str,
+ unop = unop_str
+ ),
+ );
+ }
+ }
+}
+
+/// Implementation of the `SUSPICIOUS_ELSE_FORMATTING` lint for weird `else`.
+fn check_else(cx: &EarlyContext<'_>, expr: &Expr) {
+ if_chain! {
+ if let ExprKind::If(_, then, Some(else_)) = &expr.kind;
+ if is_block(else_) || is_if(else_);
+ if !then.span.from_expansion() && !else_.span.from_expansion();
+ if !in_external_macro(cx.sess(), expr.span);
+
+ // workaround for rust-lang/rust#43081
+ if expr.span.lo().0 != 0 && expr.span.hi().0 != 0;
+
+ // this will be a span from the closing ‘}’ of the “then” block (excluding) to
+ // the “if” of the “else if” block (excluding)
+ let else_span = then.span.between(else_.span);
+
+ // the snippet should look like " else \n " with maybe comments anywhere
+ // it’s bad when there is a ‘\n’ after the “else”
+ if let Some(else_snippet) = snippet_opt(cx, else_span);
+ if let Some((pre_else, post_else)) = else_snippet.split_once("else");
+ if let Some((_, post_else_post_eol)) = post_else.split_once('\n');
+
+ then {
+ // Allow allman style braces `} \n else \n {`
+ if_chain! {
+ if is_block(else_);
+ if let Some((_, pre_else_post_eol)) = pre_else.split_once('\n');
+ // Exactly one eol before and after the else
+ if !pre_else_post_eol.contains('\n');
+ if !post_else_post_eol.contains('\n');
+ then {
+ return;
+ }
+ }
+
+ let else_desc = if is_if(else_) { "if" } else { "{..}" };
+ span_lint_and_note(
+ cx,
+ SUSPICIOUS_ELSE_FORMATTING,
+ else_span,
+ &format!("this is an `else {}` but the formatting might hide it", else_desc),
+ None,
+ &format!(
+ "to remove this lint, remove the `else` or remove the new line between \
+ `else` and `{}`",
+ else_desc,
+ ),
+ );
+ }
+ }
+}
+
+#[must_use]
+fn has_unary_equivalent(bin_op: BinOpKind) -> bool {
+ // &, *, -
+ bin_op == BinOpKind::And || bin_op == BinOpKind::Mul || bin_op == BinOpKind::Sub
+}
+
+fn indentation(cx: &EarlyContext<'_>, span: Span) -> usize {
+ cx.sess().source_map().lookup_char_pos(span.lo()).col.0
+}
+
+/// Implementation of the `POSSIBLE_MISSING_COMMA` lint for array
+fn check_array(cx: &EarlyContext<'_>, expr: &Expr) {
+ if let ExprKind::Array(ref array) = expr.kind {
+ for element in array {
+ if_chain! {
+ if let ExprKind::Binary(ref op, ref lhs, _) = element.kind;
+ if has_unary_equivalent(op.node) && lhs.span.ctxt() == op.span.ctxt();
+ let space_span = lhs.span.between(op.span);
+ if let Some(space_snippet) = snippet_opt(cx, space_span);
+ let lint_span = lhs.span.with_lo(lhs.span.hi());
+ if space_snippet.contains('\n');
+ if indentation(cx, op.span) <= indentation(cx, lhs.span);
+ then {
+ span_lint_and_note(
+ cx,
+ POSSIBLE_MISSING_COMMA,
+ lint_span,
+ "possibly missing a comma here",
+ None,
+ "to remove this lint, add a comma or write the expr in a single line",
+ );
+ }
+ }
+ }
+ }
+}
+
+fn check_missing_else(cx: &EarlyContext<'_>, first: &Expr, second: &Expr) {
+ if_chain! {
+ if !first.span.from_expansion() && !second.span.from_expansion();
- if let Some(if_snip) = snippet_opt(cx, first.span.until(cond_expr.span));
- if if_snip.starts_with("if");
++ if matches!(first.kind, ExprKind::If(..));
+ if is_block(second) || is_if(second);
+
+ // Proc-macros can give weird spans. Make sure this is actually an `if`.
++ if is_span_if(cx, first.span);
+
+ // If there is a line break between the two expressions, don't lint.
+ // If there is a non-whitespace character, this span came from a proc-macro.
+ let else_span = first.span.between(second.span);
+ if let Some(else_snippet) = snippet_opt(cx, else_span);
+ if !else_snippet.chars().any(|c| c == '\n' || !c.is_whitespace());
+ then {
+ let (looks_like, next_thing) = if is_if(second) {
+ ("an `else if`", "the second `if`")
+ } else {
+ ("an `else {..}`", "the next block")
+ };
+
+ span_lint_and_note(
+ cx,
+ SUSPICIOUS_ELSE_FORMATTING,
+ else_span,
+ &format!("this looks like {} but the `else` is missing", looks_like),
+ None,
+ &format!(
+ "to remove this lint, add the missing `else` or add a new line before {}",
+ next_thing,
+ ),
+ );
+ }
+ }
+}
+
+fn is_block(expr: &Expr) -> bool {
+ matches!(expr.kind, ExprKind::Block(..))
+}
+
+/// Check if the expression is an `if` or `if let`
+fn is_if(expr: &Expr) -> bool {
+ matches!(expr.kind, ExprKind::If(..))
+}
--- /dev/null
- if let ExprKind::Call(maybe_path, arguments) = &exp.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::is_type_diagnostic_item;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{def, Expr, ExprKind, PrimTy, QPath, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::Ty;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Checks for function invocations of the form `primitive::from_str_radix(s, 10)`
+ ///
+ /// ### Why is this bad?
+ ///
+ /// This specific common use case can be rewritten as `s.parse::<primitive>()`
+ /// (and in most cases, the turbofish can be removed), which reduces code length
+ /// and complexity.
+ ///
+ /// ### Known problems
+ ///
+ /// This lint may suggest using (&<expression>).parse() instead of <expression>.parse() directly
+ /// in some cases, which is correct but adds unnecessary complexity to the code.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// let input: &str = get_input();
+ /// let num = u16::from_str_radix(input, 10)?;
+ /// ```
+ /// Use instead:
+ /// ```ignore
+ /// let input: &str = get_input();
+ /// let num: u16 = input.parse()?;
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub FROM_STR_RADIX_10,
+ style,
+ "from_str_radix with radix 10"
+}
+
+declare_lint_pass!(FromStrRadix10 => [FROM_STR_RADIX_10]);
+
+impl<'tcx> LateLintPass<'tcx> for FromStrRadix10 {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, exp: &Expr<'tcx>) {
+ if_chain! {
- if arguments.len() == 2;
- if let ExprKind::Lit(lit) = &arguments[1].kind;
++ if let ExprKind::Call(maybe_path, [src, radix]) = &exp.kind;
+ if let ExprKind::Path(QPath::TypeRelative(ty, pathseg)) = &maybe_path.kind;
+
+ // check if the first part of the path is some integer primitive
+ if let TyKind::Path(ty_qpath) = &ty.kind;
+ let ty_res = cx.qpath_res(ty_qpath, ty.hir_id);
+ if let def::Res::PrimTy(prim_ty) = ty_res;
+ if matches!(prim_ty, PrimTy::Int(_) | PrimTy::Uint(_));
+
+ // check if the second part of the path indeed calls the associated
+ // function `from_str_radix`
+ if pathseg.ident.name.as_str() == "from_str_radix";
+
+ // check if the second argument is a primitive `10`
- let expr = if let ExprKind::AddrOf(_, _, expr) = &arguments[0].kind {
++ if let ExprKind::Lit(lit) = &radix.kind;
+ if let rustc_ast::ast::LitKind::Int(10, _) = lit.node;
+
+ then {
- &arguments[0]
++ let expr = if let ExprKind::AddrOf(_, _, expr) = &src.kind {
+ let ty = cx.typeck_results().expr_ty(expr);
+ if is_ty_stringish(cx, ty) {
+ expr
+ } else {
- &arguments[0]
++ &src
+ }
+ } else {
++ &src
+ };
+
+ let sugg = Sugg::hir_with_applicability(
+ cx,
+ expr,
+ "<string>",
+ &mut Applicability::MachineApplicable
+ ).maybe_par();
+
+ span_lint_and_sugg(
+ cx,
+ FROM_STR_RADIX_10,
+ exp.span,
+ "this call to `from_str_radix` can be replaced with a call to `str::parse`",
+ "try",
+ format!("{}.parse::<{}>()", sugg, prim_ty.name_str()),
+ Applicability::MaybeIncorrect
+ );
+ }
+ }
+ }
+}
+
+/// Checks if a Ty is `String` or `&str`
+fn is_ty_stringish(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ is_type_diagnostic_item(cx, ty, sym::String) || is_type_diagnostic_item(cx, ty, sym::str)
+}
--- /dev/null
- LintId::of(blacklisted_name::BLACKLISTED_NAME),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::all", Some("clippy_all"), vec![
+ LintId::of(almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE),
+ LintId::of(approx_const::APPROX_CONSTANT),
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
+ LintId::of(async_yields_async::ASYNC_YIELDS_ASYNC),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(attrs::DEPRECATED_SEMVER),
+ LintId::of(attrs::MISMATCHED_TARGET_OS),
+ LintId::of(attrs::USELESS_ATTRIBUTE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
- LintId::of(booleans::LOGIC_BUG),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
- LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
+ LintId::of(booleans::NONMINIMAL_BOOL),
++ LintId::of(booleans::OVERLY_COMPLEX_BOOL_EXPR),
+ 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_names::DISALLOWED_NAMES),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(drop_forget_ref::DROP_COPY),
+ LintId::of(drop_forget_ref::DROP_NON_DROP),
+ LintId::of(drop_forget_ref::DROP_REF),
+ LintId::of(drop_forget_ref::FORGET_COPY),
+ LintId::of(drop_forget_ref::FORGET_NON_DROP),
+ LintId::of(drop_forget_ref::FORGET_REF),
+ LintId::of(drop_forget_ref::UNDROPPED_MANUALLY_DROPS),
+ LintId::of(duplicate_mod::DUPLICATE_MOD),
+ LintId::of(entry::MAP_ENTRY),
+ LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(escape::BOXED_LOCAL),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(format::USELESS_FORMAT),
+ LintId::of(format_args::FORMAT_IN_FORMAT_ARGS),
+ LintId::of(format_args::TO_STRING_IN_FORMAT_ARGS),
+ LintId::of(format_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::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(partialeq_to_none::PARTIALEQ_TO_NONE),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::INVALID_NULL_PTR_USAGE),
+ LintId::of(ptr::MUT_FROM_REF),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(ranges::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
- LintId::of(booleans::LOGIC_BUG),
+// 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::correctness", Some("clippy_correctness"), vec![
+ LintId::of(approx_const::APPROX_CONSTANT),
+ LintId::of(async_yields_async::ASYNC_YIELDS_ASYNC),
+ LintId::of(attrs::DEPRECATED_SEMVER),
+ LintId::of(attrs::MISMATCHED_TARGET_OS),
+ LintId::of(attrs::USELESS_ATTRIBUTE),
++ LintId::of(booleans::OVERLY_COMPLEX_BOOL_EXPR),
+ LintId::of(casts::CAST_REF_TO_MUT),
+ LintId::of(casts::CAST_SLICE_DIFFERENT_SIZES),
+ LintId::of(copies::IFS_SAME_COND),
+ LintId::of(copies::IF_SAME_THEN_ELSE),
+ LintId::of(derive::DERIVE_HASH_XOR_EQ),
+ LintId::of(derive::DERIVE_ORD_XOR_PARTIAL_ORD),
+ LintId::of(drop_forget_ref::DROP_COPY),
+ LintId::of(drop_forget_ref::DROP_REF),
+ LintId::of(drop_forget_ref::FORGET_COPY),
+ LintId::of(drop_forget_ref::FORGET_REF),
+ LintId::of(drop_forget_ref::UNDROPPED_MANUALLY_DROPS),
+ LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
+ LintId::of(format_impl::RECURSIVE_FORMAT_IMPL),
+ LintId::of(formatting::POSSIBLE_MISSING_COMMA),
+ LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF),
+ 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_SHADOW_DISPLAY),
+ LintId::of(inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
+ LintId::of(invalid_utf8_in_unchecked::INVALID_UTF8_IN_UNCHECKED),
+ LintId::of(let_underscore::LET_UNDERSCORE_LOCK),
+ LintId::of(literal_representation::MISTYPED_LITERAL_SUFFIXES),
+ LintId::of(loops::ITER_NEXT_LOOP),
+ LintId::of(loops::NEVER_LOOP),
+ LintId::of(loops::WHILE_IMMUTABLE_CONDITION),
+ LintId::of(matches::MATCH_STR_CASE_MISMATCH),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_UNINIT),
+ LintId::of(methods::CLONE_DOUBLE_REF),
+ LintId::of(methods::ITERATOR_STEP_BY_ZERO),
+ LintId::of(methods::SUSPICIOUS_SPLITN),
+ LintId::of(methods::UNINIT_ASSUMED_INIT),
+ LintId::of(methods::ZST_OFFSET),
+ LintId::of(minmax::MIN_MAX),
+ LintId::of(non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS),
+ LintId::of(open_options::NONSENSICAL_OPEN_OPTIONS),
+ LintId::of(operators::ABSURD_EXTREME_COMPARISONS),
+ LintId::of(operators::BAD_BIT_MASK),
+ LintId::of(operators::CMP_NAN),
+ LintId::of(operators::EQ_OP),
+ LintId::of(operators::ERASING_OP),
+ LintId::of(operators::INEFFECTIVE_BIT_MASK),
+ LintId::of(operators::MODULO_ONE),
+ LintId::of(operators::SELF_ASSIGNMENT),
+ LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
+ LintId::of(ptr::INVALID_NULL_PTR_USAGE),
+ LintId::of(ptr::MUT_FROM_REF),
+ LintId::of(ranges::REVERSED_EMPTY_RANGES),
+ LintId::of(read_zero_byte_vec::READ_ZERO_BYTE_VEC),
+ LintId::of(regex::INVALID_REGEX),
+ LintId::of(serde_api::SERDE_API_MISUSE),
+ LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
+ LintId::of(swap::ALMOST_SWAPPED),
+ LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
+ LintId::of(transmute::WRONG_TRANSMUTE),
+ LintId::of(transmuting_null::TRANSMUTING_NULL),
+ 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::UNIT_CMP),
+ LintId::of(unnamed_address::FN_ADDRESS_COMPARISONS),
+ LintId::of(unnamed_address::VTABLE_ADDRESS_COMPARISONS),
+ LintId::of(unused_io_amount::UNUSED_IO_AMOUNT),
+ LintId::of(unwrap::PANICKING_UNWRAP),
+ LintId::of(vec_resize_to_zero::VEC_RESIZE_TO_ZERO),
+])
--- /dev/null
- blacklisted_name::BLACKLISTED_NAME,
+// 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,
- booleans::LOGIC_BUG,
+ blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS,
+ bool_assert_comparison::BOOL_ASSERT_COMPARISON,
+ booleans::NONMINIMAL_BOOL,
++ booleans::OVERLY_COMPLEX_BOOL_EXPR,
+ 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_names::DISALLOWED_NAMES,
+ 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_instant_elapsed::MANUAL_INSTANT_ELAPSED,
+ 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,
++ partialeq_to_none::PARTIALEQ_TO_NONE,
+ pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE,
+ pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF,
+ 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::nursery", Some("clippy_nursery"), vec![
+ LintId::of(attrs::EMPTY_LINE_AFTER_OUTER_ATTR),
+ LintId::of(cognitive_complexity::COGNITIVE_COMPLEXITY),
+ LintId::of(copies::BRANCHES_SHARING_CODE),
+ LintId::of(equatable_if_let::EQUATABLE_IF_LET),
+ LintId::of(fallible_impl_from::FALLIBLE_IMPL_FROM),
+ LintId::of(floating_point_arithmetic::IMPRECISE_FLOPS),
+ LintId::of(floating_point_arithmetic::SUBOPTIMAL_FLOPS),
+ LintId::of(future_not_send::FUTURE_NOT_SEND),
+ LintId::of(index_refutable_slice::INDEX_REFUTABLE_SLICE),
+ LintId::of(let_if_seq::USELESS_LET_IF_SEQ),
++ LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
+ LintId::of(methods::ITER_WITH_DRAIN),
+ LintId::of(missing_const_for_fn::MISSING_CONST_FOR_FN),
+ LintId::of(mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL),
+ LintId::of(mutex_atomic::MUTEX_ATOMIC),
+ LintId::of(mutex_atomic::MUTEX_INTEGER),
+ LintId::of(non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY),
+ LintId::of(nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES),
+ LintId::of(only_used_in_recursion::ONLY_USED_IN_RECURSION),
+ LintId::of(option_if_let_else::OPTION_IF_LET_ELSE),
+ LintId::of(path_buf_push_overwrite::PATH_BUF_PUSH_OVERWRITE),
+ LintId::of(redundant_pub_crate::REDUNDANT_PUB_CRATE),
+ LintId::of(regex::TRIVIAL_REGEX),
+ LintId::of(strings::STRING_LIT_AS_BYTES),
+ LintId::of(suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS),
+ LintId::of(trailing_empty_array::TRAILING_EMPTY_ARRAY),
+ LintId::of(transmute::TRANSMUTE_UNDEFINED_REPR),
+ LintId::of(unused_rounding::UNUSED_ROUNDING),
+ LintId::of(use_self::USE_SELF),
+])
--- /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::pedantic", Some("clippy_pedantic"), vec![
+ LintId::of(attrs::INLINE_ALWAYS),
+ LintId::of(borrow_as_ptr::BORROW_AS_PTR),
+ LintId::of(bytecount::NAIVE_BYTECOUNT),
+ LintId::of(case_sensitive_file_extension_comparisons::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS),
+ LintId::of(casts::CAST_LOSSLESS),
+ LintId::of(casts::CAST_POSSIBLE_TRUNCATION),
+ LintId::of(casts::CAST_POSSIBLE_WRAP),
+ LintId::of(casts::CAST_PRECISION_LOSS),
+ LintId::of(casts::CAST_PTR_ALIGNMENT),
+ LintId::of(casts::CAST_SIGN_LOSS),
+ LintId::of(casts::PTR_AS_PTR),
+ LintId::of(checked_conversions::CHECKED_CONVERSIONS),
+ LintId::of(copies::SAME_FUNCTIONS_IN_IF_CONDITION),
+ LintId::of(copy_iterator::COPY_ITERATOR),
+ LintId::of(default::DEFAULT_TRAIT_ACCESS),
+ LintId::of(dereference::EXPLICIT_DEREF_METHODS),
+ LintId::of(dereference::REF_BINDING_TO_REFERENCE),
+ LintId::of(derive::EXPL_IMPL_CLONE_ON_COPY),
+ LintId::of(derive::UNSAFE_DERIVE_DESERIALIZE),
+ LintId::of(doc::DOC_MARKDOWN),
+ LintId::of(doc::MISSING_ERRORS_DOC),
+ LintId::of(doc::MISSING_PANICS_DOC),
+ LintId::of(doc_link_with_quotes::DOC_LINK_WITH_QUOTES),
+ LintId::of(empty_enum::EMPTY_ENUM),
+ LintId::of(enum_variants::MODULE_NAME_REPETITIONS),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS),
+ LintId::of(excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS),
+ LintId::of(excessive_bools::STRUCT_EXCESSIVE_BOOLS),
+ LintId::of(functions::MUST_USE_CANDIDATE),
+ LintId::of(functions::TOO_MANY_LINES),
+ LintId::of(if_not_else::IF_NOT_ELSE),
+ LintId::of(implicit_hasher::IMPLICIT_HASHER),
+ LintId::of(implicit_saturating_sub::IMPLICIT_SATURATING_SUB),
+ LintId::of(inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR),
+ LintId::of(infinite_iter::MAYBE_INFINITE_ITER),
+ LintId::of(invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS),
+ LintId::of(items_after_statements::ITEMS_AFTER_STATEMENTS),
+ LintId::of(iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR),
+ LintId::of(large_stack_arrays::LARGE_STACK_ARRAYS),
+ LintId::of(let_underscore::LET_UNDERSCORE_DROP),
+ LintId::of(literal_representation::LARGE_DIGIT_GROUPS),
+ LintId::of(literal_representation::UNREADABLE_LITERAL),
+ LintId::of(loops::EXPLICIT_INTO_ITER_LOOP),
+ LintId::of(loops::EXPLICIT_ITER_LOOP),
+ LintId::of(macro_use::MACRO_USE_IMPORTS),
+ LintId::of(manual_assert::MANUAL_ASSERT),
++ LintId::of(manual_instant_elapsed::MANUAL_INSTANT_ELAPSED),
+ LintId::of(manual_ok_or::MANUAL_OK_OR),
+ LintId::of(matches::MATCH_BOOL),
+ LintId::of(matches::MATCH_ON_VEC_ITEMS),
+ LintId::of(matches::MATCH_SAME_ARMS),
+ LintId::of(matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS),
+ LintId::of(matches::MATCH_WILD_ERR_ARM),
+ LintId::of(matches::SINGLE_MATCH_ELSE),
+ LintId::of(methods::CLONED_INSTEAD_OF_COPIED),
+ LintId::of(methods::FILTER_MAP_NEXT),
+ LintId::of(methods::FLAT_MAP_OPTION),
+ LintId::of(methods::FROM_ITER_INSTEAD_OF_COLLECT),
+ LintId::of(methods::IMPLICIT_CLONE),
+ LintId::of(methods::INEFFICIENT_TO_STRING),
+ LintId::of(methods::MAP_UNWRAP_OR),
+ LintId::of(methods::UNNECESSARY_JOIN),
+ LintId::of(misc::USED_UNDERSCORE_BINDING),
+ LintId::of(mismatching_type_param_order::MISMATCHING_TYPE_PARAM_ORDER),
+ LintId::of(mut_mut::MUT_MUT),
+ LintId::of(needless_continue::NEEDLESS_CONTINUE),
+ LintId::of(needless_for_each::NEEDLESS_FOR_EACH),
+ LintId::of(needless_pass_by_value::NEEDLESS_PASS_BY_VALUE),
+ LintId::of(no_effect::NO_EFFECT_UNDERSCORE_BINDING),
+ LintId::of(non_expressive_names::MANY_SINGLE_CHAR_NAMES),
+ LintId::of(non_expressive_names::SIMILAR_NAMES),
+ LintId::of(operators::FLOAT_CMP),
+ LintId::of(operators::NEEDLESS_BITWISE_BOOL),
+ LintId::of(operators::VERBOSE_BIT_MASK),
+ LintId::of(pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE),
+ LintId::of(pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF),
+ LintId::of(ranges::RANGE_MINUS_ONE),
+ LintId::of(ranges::RANGE_PLUS_ONE),
+ LintId::of(redundant_else::REDUNDANT_ELSE),
+ LintId::of(ref_option_ref::REF_OPTION_REF),
+ LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
+ LintId::of(semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED),
+ LintId::of(stable_sort_primitive::STABLE_SORT_PRIMITIVE),
+ LintId::of(strings::STRING_ADD_ASSIGN),
+ LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),
+ LintId::of(trait_bounds::TYPE_REPETITION_IN_BOUNDS),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_PTR),
+ LintId::of(types::LINKEDLIST),
+ LintId::of(types::OPTION_OPTION),
+ LintId::of(unicode::UNICODE_NOT_NFC),
+ LintId::of(unnecessary_wraps::UNNECESSARY_WRAPS),
+ LintId::of(unnested_or_patterns::UNNESTED_OR_PATTERNS),
+ LintId::of(unused_async::UNUSED_ASYNC),
+ LintId::of(unused_self::UNUSED_SELF),
+ LintId::of(wildcard_imports::ENUM_GLOB_USE),
+ LintId::of(wildcard_imports::WILDCARD_IMPORTS),
+ LintId::of(zero_sized_map_values::ZERO_SIZED_MAP_VALUES),
+])
--- /dev/null
- LintId::of(blacklisted_name::BLACKLISTED_NAME),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::style", Some("clippy_style"), vec![
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(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_names::DISALLOWED_NAMES),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(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(partialeq_to_none::PARTIALEQ_TO_NONE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(strings::TRIM_SPLIT_WHITESPACE),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(unit_types::LET_UNIT_VALUE),
+ LintId::of(unnecessary_owned_empty_strings::UNNECESSARY_OWNED_EMPTY_STRINGS),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+])
--- /dev/null
- LintId::of(matches::SIGNIFICANT_DROP_IN_SCRUTINEE),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), vec![
+ LintId::of(almost_complete_letter_range::ALMOST_COMPLETE_LETTER_RANGE),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_INVALID_TYPE),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_LOCK),
+ LintId::of(await_holding_invalid::AWAIT_HOLDING_REFCELL_REF),
+ LintId::of(casts::CAST_ABS_TO_UNSIGNED),
+ LintId::of(casts::CAST_ENUM_CONSTRUCTOR),
+ LintId::of(casts::CAST_ENUM_TRUNCATION),
+ LintId::of(crate_in_macro_def::CRATE_IN_MACRO_DEF),
+ LintId::of(drop_forget_ref::DROP_NON_DROP),
+ LintId::of(drop_forget_ref::FORGET_NON_DROP),
+ LintId::of(duplicate_mod::DUPLICATE_MOD),
+ LintId::of(format_impl::PRINT_IN_FORMAT_IMPL),
+ LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+ LintId::of(loops::EMPTY_LOOP),
+ LintId::of(loops::FOR_LOOPS_OVER_FALLIBLES),
+ LintId::of(loops::MUT_RANGE_BOUND),
+ LintId::of(methods::NO_EFFECT_REPLACE),
+ LintId::of(methods::SUSPICIOUS_MAP),
+ LintId::of(mut_key::MUTABLE_KEY_TYPE),
+ LintId::of(octal_escapes::OCTAL_ESCAPES),
+ LintId::of(operators::FLOAT_EQUALITY_WITHOUT_ABS),
+ LintId::of(operators::MISREFACTORED_ASSIGN_OP),
+ LintId::of(rc_clone_in_vec_init::RC_CLONE_IN_VEC_INIT),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+ LintId::of(swap_ptr_to_ref::SWAP_PTR_TO_REF),
+])
--- /dev/null
- mod blacklisted_name;
+#![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;
- let TryConf { conf, errors } = utils::conf::read(&file_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_names;
+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_instant_elapsed;
+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 partialeq_to_none;
+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 blacklisted_names = conf.blacklisted_names.iter().cloned().collect::<FxHashSet<_>>();
- store.register_late_pass(move || Box::new(blacklisted_name::BlacklistedName::new(blacklisted_names.clone())));
++ let TryConf { conf, errors, warnings } = utils::conf::read(&file_name);
+ // all conf errors are non-fatal, we just use the default conf in case of error
+ for error in errors {
+ sess.err(&format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ format_error(error)
+ ));
+ }
+
++ for warning in warnings {
++ sess.struct_warn(&format!(
++ "error reading Clippy's configuration file `{}`: {}",
++ file_name.display(),
++ format_error(warning)
++ ))
++ .emit();
++ }
++
+ conf
+}
+
+/// 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 disallowed_names = conf.disallowed_names.iter().cloned().collect::<FxHashSet<_>>();
++ store.register_late_pass(move || Box::new(disallowed_names::DisallowedNames::new(disallowed_names.clone())));
+ let too_many_arguments_threshold = conf.too_many_arguments_threshold;
+ let too_many_lines_threshold = conf.too_many_lines_threshold;
+ 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(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()));
++ store.register_late_pass(|| Box::new(manual_instant_elapsed::ManualInstantElapsed));
++ store.register_late_pass(|| Box::new(partialeq_to_none::PartialeqToNone));
+ // 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
- if let ExprKind::MethodCall(method, len_args, _) = end.kind;
+use super::{IncrementVisitor, InitializeVisitor, MANUAL_MEMCPY};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet;
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::is_copy;
+use clippy_utils::{get_enclosing_block, higher, path_to_local, sugg};
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::walk_block;
+use rustc_hir::{BinOpKind, Block, Expr, ExprKind, HirId, Pat, PatKind, StmtKind};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::sym;
+use std::fmt::Display;
+use std::iter::Iterator;
+
+/// Checks for for loops that sequentially copy items from one slice-like
+/// object to another.
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ arg: &'tcx Expr<'_>,
+ body: &'tcx Expr<'_>,
+ expr: &'tcx Expr<'_>,
+) -> bool {
+ if let Some(higher::Range {
+ start: Some(start),
+ end: Some(end),
+ limits,
+ }) = higher::Range::hir(arg)
+ {
+ // the var must be a single name
+ if let PatKind::Binding(_, canonical_id, _, _) = pat.kind {
+ let mut starts = vec![Start {
+ id: canonical_id,
+ kind: StartKind::Range,
+ }];
+
+ // This is one of few ways to return different iterators
+ // derived from: https://stackoverflow.com/questions/29760668/conditionally-iterate-over-one-of-several-possible-iterators/52064434#52064434
+ let mut iter_a = None;
+ let mut iter_b = None;
+
+ if let ExprKind::Block(block, _) = body.kind {
+ if let Some(loop_counters) = get_loop_counters(cx, block, expr) {
+ starts.extend(loop_counters);
+ }
+ iter_a = Some(get_assignments(block, &starts));
+ } else {
+ iter_b = Some(get_assignment(body));
+ }
+
+ let assignments = iter_a.into_iter().flatten().chain(iter_b.into_iter());
+
+ let big_sugg = assignments
+ // The only statements in the for loops can be indexed assignments from
+ // indexed retrievals (except increments of loop counters).
+ .map(|o| {
+ o.and_then(|(lhs, rhs)| {
+ let rhs = fetch_cloned_expr(rhs);
+ if_chain! {
+ if let ExprKind::Index(base_left, idx_left) = lhs.kind;
+ if let ExprKind::Index(base_right, idx_right) = rhs.kind;
+ if let Some(ty) = get_slice_like_element_ty(cx, cx.typeck_results().expr_ty(base_left));
+ if get_slice_like_element_ty(cx, cx.typeck_results().expr_ty(base_right)).is_some();
+ if let Some((start_left, offset_left)) = get_details_from_idx(cx, idx_left, &starts);
+ if let Some((start_right, offset_right)) = get_details_from_idx(cx, idx_right, &starts);
+
+ // Source and destination must be different
+ if path_to_local(base_left) != path_to_local(base_right);
+ then {
+ Some((ty, IndexExpr { base: base_left, idx: start_left, idx_offset: offset_left },
+ IndexExpr { base: base_right, idx: start_right, idx_offset: offset_right }))
+ } else {
+ None
+ }
+ }
+ })
+ })
+ .map(|o| o.map(|(ty, dst, src)| build_manual_memcpy_suggestion(cx, start, end, limits, ty, &dst, &src)))
+ .collect::<Option<Vec<_>>>()
+ .filter(|v| !v.is_empty())
+ .map(|v| v.join("\n "));
+
+ if let Some(big_sugg) = big_sugg {
+ span_lint_and_sugg(
+ cx,
+ MANUAL_MEMCPY,
+ expr.span,
+ "it looks like you're manually copying between slices",
+ "try replacing the loop by",
+ big_sugg,
+ Applicability::Unspecified,
+ );
+ return true;
+ }
+ }
+ }
+ false
+}
+
+fn build_manual_memcpy_suggestion<'tcx>(
+ cx: &LateContext<'tcx>,
+ start: &Expr<'_>,
+ end: &Expr<'_>,
+ limits: ast::RangeLimits,
+ elem_ty: Ty<'tcx>,
+ dst: &IndexExpr<'_>,
+ src: &IndexExpr<'_>,
+) -> String {
+ fn print_offset(offset: MinifyingSugg<'static>) -> MinifyingSugg<'static> {
+ if offset.to_string() == "0" {
+ sugg::EMPTY.into()
+ } else {
+ offset
+ }
+ }
+
+ let print_limit = |end: &Expr<'_>, end_str: &str, base: &Expr<'_>, sugg: MinifyingSugg<'static>| {
+ if_chain! {
- if len_args.len() == 1;
- if let Some(arg) = len_args.get(0);
- if path_to_local(arg) == path_to_local(base);
++ if let ExprKind::MethodCall(method, [recv], _) = end.kind;
+ if method.ident.name == sym::len;
- if let ExprKind::MethodCall(method, args, _) = expr.kind;
++ if path_to_local(recv) == path_to_local(base);
+ then {
+ if sugg.to_string() == end_str {
+ sugg::EMPTY.into()
+ } else {
+ sugg
+ }
+ } else {
+ match limits {
+ ast::RangeLimits::Closed => {
+ sugg + &sugg::ONE.into()
+ },
+ ast::RangeLimits::HalfOpen => sugg,
+ }
+ }
+ }
+ };
+
+ let start_str = Sugg::hir(cx, start, "").into();
+ let end_str: MinifyingSugg<'_> = Sugg::hir(cx, end, "").into();
+
+ let print_offset_and_limit = |idx_expr: &IndexExpr<'_>| match idx_expr.idx {
+ StartKind::Range => (
+ print_offset(apply_offset(&start_str, &idx_expr.idx_offset)).into_sugg(),
+ print_limit(
+ end,
+ end_str.to_string().as_str(),
+ idx_expr.base,
+ apply_offset(&end_str, &idx_expr.idx_offset),
+ )
+ .into_sugg(),
+ ),
+ StartKind::Counter { initializer } => {
+ let counter_start = Sugg::hir(cx, initializer, "").into();
+ (
+ print_offset(apply_offset(&counter_start, &idx_expr.idx_offset)).into_sugg(),
+ print_limit(
+ end,
+ end_str.to_string().as_str(),
+ idx_expr.base,
+ apply_offset(&end_str, &idx_expr.idx_offset) + &counter_start - &start_str,
+ )
+ .into_sugg(),
+ )
+ },
+ };
+
+ let (dst_offset, dst_limit) = print_offset_and_limit(dst);
+ let (src_offset, src_limit) = print_offset_and_limit(src);
+
+ let dst_base_str = snippet(cx, dst.base.span, "???");
+ let src_base_str = snippet(cx, src.base.span, "???");
+
+ let dst = if dst_offset == sugg::EMPTY && dst_limit == sugg::EMPTY {
+ dst_base_str
+ } else {
+ format!(
+ "{}[{}..{}]",
+ dst_base_str,
+ dst_offset.maybe_par(),
+ dst_limit.maybe_par()
+ )
+ .into()
+ };
+
+ let method_str = if is_copy(cx, elem_ty) {
+ "copy_from_slice"
+ } else {
+ "clone_from_slice"
+ };
+
+ format!(
+ "{}.{}(&{}[{}..{}]);",
+ dst,
+ method_str,
+ src_base_str,
+ src_offset.maybe_par(),
+ src_limit.maybe_par()
+ )
+}
+
+/// a wrapper of `Sugg`. Besides what `Sugg` do, this removes unnecessary `0`;
+/// and also, it avoids subtracting a variable from the same one by replacing it with `0`.
+/// it exists for the convenience of the overloaded operators while normal functions can do the
+/// same.
+#[derive(Clone)]
+struct MinifyingSugg<'a>(Sugg<'a>);
+
+impl<'a> Display for MinifyingSugg<'a> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ self.0.fmt(f)
+ }
+}
+
+impl<'a> MinifyingSugg<'a> {
+ fn into_sugg(self) -> Sugg<'a> {
+ self.0
+ }
+}
+
+impl<'a> From<Sugg<'a>> for MinifyingSugg<'a> {
+ fn from(sugg: Sugg<'a>) -> Self {
+ Self(sugg)
+ }
+}
+
+impl std::ops::Add for &MinifyingSugg<'static> {
+ type Output = MinifyingSugg<'static>;
+ fn add(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
+ match (self.to_string().as_str(), rhs.to_string().as_str()) {
+ ("0", _) => rhs.clone(),
+ (_, "0") => self.clone(),
+ (_, _) => (&self.0 + &rhs.0).into(),
+ }
+ }
+}
+
+impl std::ops::Sub for &MinifyingSugg<'static> {
+ type Output = MinifyingSugg<'static>;
+ fn sub(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
+ match (self.to_string().as_str(), rhs.to_string().as_str()) {
+ (_, "0") => self.clone(),
+ ("0", _) => (-rhs.0.clone()).into(),
+ (x, y) if x == y => sugg::ZERO.into(),
+ (_, _) => (&self.0 - &rhs.0).into(),
+ }
+ }
+}
+
+impl std::ops::Add<&MinifyingSugg<'static>> for MinifyingSugg<'static> {
+ type Output = MinifyingSugg<'static>;
+ fn add(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
+ match (self.to_string().as_str(), rhs.to_string().as_str()) {
+ ("0", _) => rhs.clone(),
+ (_, "0") => self,
+ (_, _) => (self.0 + &rhs.0).into(),
+ }
+ }
+}
+
+impl std::ops::Sub<&MinifyingSugg<'static>> for MinifyingSugg<'static> {
+ type Output = MinifyingSugg<'static>;
+ fn sub(self, rhs: &MinifyingSugg<'static>) -> MinifyingSugg<'static> {
+ match (self.to_string().as_str(), rhs.to_string().as_str()) {
+ (_, "0") => self,
+ ("0", _) => (-rhs.0.clone()).into(),
+ (x, y) if x == y => sugg::ZERO.into(),
+ (_, _) => (self.0 - &rhs.0).into(),
+ }
+ }
+}
+
+/// a wrapper around `MinifyingSugg`, which carries an operator like currying
+/// so that the suggested code become more efficient (e.g. `foo + -bar` `foo - bar`).
+struct Offset {
+ value: MinifyingSugg<'static>,
+ sign: OffsetSign,
+}
+
+#[derive(Clone, Copy)]
+enum OffsetSign {
+ Positive,
+ Negative,
+}
+
+impl Offset {
+ fn negative(value: Sugg<'static>) -> Self {
+ Self {
+ value: value.into(),
+ sign: OffsetSign::Negative,
+ }
+ }
+
+ fn positive(value: Sugg<'static>) -> Self {
+ Self {
+ value: value.into(),
+ sign: OffsetSign::Positive,
+ }
+ }
+
+ fn empty() -> Self {
+ Self::positive(sugg::ZERO)
+ }
+}
+
+fn apply_offset(lhs: &MinifyingSugg<'static>, rhs: &Offset) -> MinifyingSugg<'static> {
+ match rhs.sign {
+ OffsetSign::Positive => lhs + &rhs.value,
+ OffsetSign::Negative => lhs - &rhs.value,
+ }
+}
+
+#[derive(Debug, Clone, Copy)]
+enum StartKind<'hir> {
+ Range,
+ Counter { initializer: &'hir Expr<'hir> },
+}
+
+struct IndexExpr<'hir> {
+ base: &'hir Expr<'hir>,
+ idx: StartKind<'hir>,
+ idx_offset: Offset,
+}
+
+struct Start<'hir> {
+ id: HirId,
+ kind: StartKind<'hir>,
+}
+
+fn get_slice_like_element_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ match ty.kind() {
+ ty::Adt(adt, subs) if cx.tcx.is_diagnostic_item(sym::Vec, adt.did()) => Some(subs.type_at(0)),
+ ty::Ref(_, subty, _) => get_slice_like_element_ty(cx, *subty),
+ ty::Slice(ty) | ty::Array(ty, _) => Some(*ty),
+ _ => None,
+ }
+}
+
+fn fetch_cloned_expr<'tcx>(expr: &'tcx Expr<'tcx>) -> &'tcx Expr<'tcx> {
+ if_chain! {
- if args.len() == 1;
- if let Some(arg) = args.get(0);
++ if let ExprKind::MethodCall(method, [arg], _) = expr.kind;
+ if method.ident.name == sym::clone;
+ then { arg } else { expr }
+ }
+}
+
+fn get_details_from_idx<'tcx>(
+ cx: &LateContext<'tcx>,
+ idx: &Expr<'_>,
+ starts: &[Start<'tcx>],
+) -> Option<(StartKind<'tcx>, Offset)> {
+ fn get_start<'tcx>(e: &Expr<'_>, starts: &[Start<'tcx>]) -> Option<StartKind<'tcx>> {
+ let id = path_to_local(e)?;
+ starts.iter().find(|start| start.id == id).map(|start| start.kind)
+ }
+
+ fn get_offset<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>, starts: &[Start<'tcx>]) -> Option<Sugg<'static>> {
+ match &e.kind {
+ ExprKind::Lit(l) => match l.node {
+ ast::LitKind::Int(x, _ty) => Some(Sugg::NonParen(x.to_string().into())),
+ _ => None,
+ },
+ ExprKind::Path(..) if get_start(e, starts).is_none() => Some(Sugg::hir(cx, e, "???")),
+ _ => None,
+ }
+ }
+
+ match idx.kind {
+ ExprKind::Binary(op, lhs, rhs) => match op.node {
+ BinOpKind::Add => {
+ let offset_opt = get_start(lhs, starts)
+ .and_then(|s| get_offset(cx, rhs, starts).map(|o| (s, o)))
+ .or_else(|| get_start(rhs, starts).and_then(|s| get_offset(cx, lhs, starts).map(|o| (s, o))));
+
+ offset_opt.map(|(s, o)| (s, Offset::positive(o)))
+ },
+ BinOpKind::Sub => {
+ get_start(lhs, starts).and_then(|s| get_offset(cx, rhs, starts).map(|o| (s, Offset::negative(o))))
+ },
+ _ => None,
+ },
+ ExprKind::Path(..) => get_start(idx, starts).map(|s| (s, Offset::empty())),
+ _ => None,
+ }
+}
+
+fn get_assignment<'tcx>(e: &'tcx Expr<'tcx>) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> {
+ if let ExprKind::Assign(lhs, rhs, _) = e.kind {
+ Some((lhs, rhs))
+ } else {
+ None
+ }
+}
+
+/// Get assignments from the given block.
+/// The returned iterator yields `None` if no assignment expressions are there,
+/// filtering out the increments of the given whitelisted loop counters;
+/// because its job is to make sure there's nothing other than assignments and the increments.
+fn get_assignments<'a, 'tcx>(
+ Block { stmts, expr, .. }: &'tcx Block<'tcx>,
+ loop_counters: &'a [Start<'tcx>],
+) -> impl Iterator<Item = Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>> + 'a {
+ // As the `filter` and `map` below do different things, I think putting together
+ // just increases complexity. (cc #3188 and #4193)
+ stmts
+ .iter()
+ .filter_map(move |stmt| match stmt.kind {
+ StmtKind::Local(..) | StmtKind::Item(..) => None,
+ StmtKind::Expr(e) | StmtKind::Semi(e) => Some(e),
+ })
+ .chain((*expr).into_iter())
+ .filter(move |e| {
+ if let ExprKind::AssignOp(_, place, _) = e.kind {
+ path_to_local(place).map_or(false, |id| {
+ !loop_counters
+ .iter()
+ // skip the first item which should be `StartKind::Range`
+ // this makes it possible to use the slice with `StartKind::Range` in the same iterator loop.
+ .skip(1)
+ .any(|counter| counter.id == id)
+ })
+ } else {
+ true
+ }
+ })
+ .map(get_assignment)
+}
+
+fn get_loop_counters<'a, 'tcx>(
+ cx: &'a LateContext<'tcx>,
+ body: &'tcx Block<'tcx>,
+ expr: &'tcx Expr<'_>,
+) -> Option<impl Iterator<Item = Start<'tcx>> + 'a> {
+ // Look for variables that are incremented once per loop iteration.
+ let mut increment_visitor = IncrementVisitor::new(cx);
+ walk_block(&mut increment_visitor, body);
+
+ // For each candidate, check the parent block to see if
+ // it's initialized to zero at the start of the loop.
+ get_enclosing_block(cx, expr.hir_id).and_then(|block| {
+ increment_visitor
+ .into_results()
+ .filter_map(move |var_id| {
+ let mut initialize_visitor = InitializeVisitor::new(cx, expr, var_id);
+ walk_block(&mut initialize_visitor, block);
+
+ initialize_visitor.get_result().map(|(_, _, initializer)| Start {
+ id: var_id,
+ kind: StartKind::Counter { initializer },
+ })
+ })
+ .into()
+ })
+}
--- /dev/null
- if let ExprKind::MethodCall(method, len_args, _) = expr.kind;
- if len_args.len() == 1;
+use super::NEEDLESS_RANGE_LOOP;
+use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
+use clippy_utils::source::snippet;
+use clippy_utils::ty::has_iter_method;
+use clippy_utils::visitors::is_local_used;
+use clippy_utils::{contains_name, higher, is_integer_const, match_trait_method, paths, sugg, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{BinOpKind, BorrowKind, Closure, Expr, ExprKind, HirId, Mutability, Pat, PatKind, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::middle::region;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::symbol::{sym, Symbol};
+use std::iter::{self, Iterator};
+use std::mem;
+
+/// Checks for looping over a range and then indexing a sequence with it.
+/// The iteratee must be a range literal.
+#[expect(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ pat: &'tcx Pat<'_>,
+ arg: &'tcx Expr<'_>,
+ body: &'tcx Expr<'_>,
+ expr: &'tcx Expr<'_>,
+) {
+ if let Some(higher::Range {
+ start: Some(start),
+ ref end,
+ limits,
+ }) = higher::Range::hir(arg)
+ {
+ // the var must be a single name
+ if let PatKind::Binding(_, canonical_id, ident, _) = pat.kind {
+ let mut visitor = VarVisitor {
+ cx,
+ var: canonical_id,
+ indexed_mut: FxHashSet::default(),
+ indexed_indirectly: FxHashMap::default(),
+ indexed_directly: FxHashMap::default(),
+ referenced: FxHashSet::default(),
+ nonindex: false,
+ prefer_mutable: false,
+ };
+ walk_expr(&mut visitor, body);
+
+ // linting condition: we only indexed one variable, and indexed it directly
+ if visitor.indexed_indirectly.is_empty() && visitor.indexed_directly.len() == 1 {
+ let (indexed, (indexed_extent, indexed_ty)) = visitor
+ .indexed_directly
+ .into_iter()
+ .next()
+ .expect("already checked that we have exactly 1 element");
+
+ // ensure that the indexed variable was declared before the loop, see #601
+ if let Some(indexed_extent) = indexed_extent {
+ let parent_def_id = cx.tcx.hir().get_parent_item(expr.hir_id);
+ let region_scope_tree = cx.tcx.region_scope_tree(parent_def_id);
+ let pat_extent = region_scope_tree.var_scope(pat.hir_id.local_id).unwrap();
+ if region_scope_tree.is_subscope_of(indexed_extent, pat_extent) {
+ return;
+ }
+ }
+
+ // don't lint if the container that is indexed does not have .iter() method
+ let has_iter = has_iter_method(cx, indexed_ty);
+ if has_iter.is_none() {
+ return;
+ }
+
+ // don't lint if the container that is indexed into is also used without
+ // indexing
+ if visitor.referenced.contains(&indexed) {
+ return;
+ }
+
+ let starts_at_zero = is_integer_const(cx, start, 0);
+
+ let skip = if starts_at_zero {
+ String::new()
+ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, start) {
+ return;
+ } else {
+ format!(".skip({})", snippet(cx, start.span, ".."))
+ };
+
+ let mut end_is_start_plus_val = false;
+
+ let take = if let Some(end) = *end {
+ let mut take_expr = end;
+
+ if let ExprKind::Binary(ref op, left, right) = end.kind {
+ if op.node == BinOpKind::Add {
+ let start_equal_left = SpanlessEq::new(cx).eq_expr(start, left);
+ let start_equal_right = SpanlessEq::new(cx).eq_expr(start, right);
+
+ if start_equal_left {
+ take_expr = right;
+ } else if start_equal_right {
+ take_expr = left;
+ }
+
+ end_is_start_plus_val = start_equal_left | start_equal_right;
+ }
+ }
+
+ if is_len_call(end, indexed) || is_end_eq_array_len(cx, end, limits, indexed_ty) {
+ String::new()
+ } else if visitor.indexed_mut.contains(&indexed) && contains_name(indexed, take_expr) {
+ return;
+ } else {
+ match limits {
+ ast::RangeLimits::Closed => {
+ let take_expr = sugg::Sugg::hir(cx, take_expr, "<count>");
+ format!(".take({})", take_expr + sugg::ONE)
+ },
+ ast::RangeLimits::HalfOpen => {
+ format!(".take({})", snippet(cx, take_expr.span, ".."))
+ },
+ }
+ }
+ } else {
+ String::new()
+ };
+
+ let (ref_mut, method) = if visitor.indexed_mut.contains(&indexed) {
+ ("mut ", "iter_mut")
+ } else {
+ ("", "iter")
+ };
+
+ let take_is_empty = take.is_empty();
+ let mut method_1 = take;
+ let mut method_2 = skip;
+
+ if end_is_start_plus_val {
+ mem::swap(&mut method_1, &mut method_2);
+ }
+
+ if visitor.nonindex {
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is used to index `{}`", ident.name, indexed),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![
+ (pat.span, format!("({}, <item>)", ident.name)),
+ (
+ arg.span,
+ format!("{}.{}().enumerate(){}{}", indexed, method, method_1, method_2),
+ ),
+ ],
+ );
+ },
+ );
+ } else {
+ let repl = if starts_at_zero && take_is_empty {
+ format!("&{}{}", ref_mut, indexed)
+ } else {
+ format!("{}.{}(){}{}", indexed, method, method_1, method_2)
+ };
+
+ span_lint_and_then(
+ cx,
+ NEEDLESS_RANGE_LOOP,
+ arg.span,
+ &format!("the loop variable `{}` is only used to index `{}`", ident.name, indexed),
+ |diag| {
+ multispan_sugg(
+ diag,
+ "consider using an iterator",
+ vec![(pat.span, "<item>".to_string()), (arg.span, repl)],
+ );
+ },
+ );
+ }
+ }
+ }
+ }
+}
+
+fn is_len_call(expr: &Expr<'_>, var: Symbol) -> bool {
+ if_chain! {
- if let ExprKind::Path(QPath::Resolved(_, path)) = len_args[0].kind;
++ if let ExprKind::MethodCall(method, [recv], _) = expr.kind;
+ if method.ident.name == sym::len;
++ if let ExprKind::Path(QPath::Resolved(_, path)) = recv.kind;
+ if path.segments.len() == 1;
+ if path.segments[0].ident.name == var;
+ then {
+ return true;
+ }
+ }
+
+ false
+}
+
+fn is_end_eq_array_len<'tcx>(
+ cx: &LateContext<'tcx>,
+ end: &Expr<'_>,
+ limits: ast::RangeLimits,
+ indexed_ty: Ty<'tcx>,
+) -> bool {
+ if_chain! {
+ if let ExprKind::Lit(ref lit) = end.kind;
+ if let ast::LitKind::Int(end_int, _) = lit.node;
+ if let ty::Array(_, arr_len_const) = indexed_ty.kind();
+ if let Some(arr_len) = arr_len_const.try_eval_usize(cx.tcx, cx.param_env);
+ then {
+ return match limits {
+ ast::RangeLimits::Closed => end_int + 1 >= arr_len.into(),
+ ast::RangeLimits::HalfOpen => end_int >= arr_len.into(),
+ };
+ }
+ }
+
+ false
+}
+
+struct VarVisitor<'a, 'tcx> {
+ /// context reference
+ cx: &'a LateContext<'tcx>,
+ /// var name to look for as index
+ var: HirId,
+ /// indexed variables that are used mutably
+ indexed_mut: FxHashSet<Symbol>,
+ /// indirectly indexed variables (`v[(i + 4) % N]`), the extend is `None` for global
+ indexed_indirectly: FxHashMap<Symbol, Option<region::Scope>>,
+ /// subset of `indexed` of vars that are indexed directly: `v[i]`
+ /// this will not contain cases like `v[calc_index(i)]` or `v[(i + 4) % N]`
+ indexed_directly: FxHashMap<Symbol, (Option<region::Scope>, Ty<'tcx>)>,
+ /// Any names that are used outside an index operation.
+ /// Used to detect things like `&mut vec` used together with `vec[i]`
+ referenced: FxHashSet<Symbol>,
+ /// has the loop variable been used in expressions other than the index of
+ /// an index op?
+ nonindex: bool,
+ /// Whether we are inside the `$` in `&mut $` or `$ = foo` or `$.bar`, where bar
+ /// takes `&mut self`
+ prefer_mutable: bool,
+}
+
+impl<'a, 'tcx> VarVisitor<'a, 'tcx> {
+ fn check(&mut self, idx: &'tcx Expr<'_>, seqexpr: &'tcx Expr<'_>, expr: &'tcx Expr<'_>) -> bool {
+ if_chain! {
+ // the indexed container is referenced by a name
+ if let ExprKind::Path(ref seqpath) = seqexpr.kind;
+ if let QPath::Resolved(None, seqvar) = *seqpath;
+ if seqvar.segments.len() == 1;
+ if is_local_used(self.cx, idx, self.var);
+ then {
+ if self.prefer_mutable {
+ self.indexed_mut.insert(seqvar.segments[0].ident.name);
+ }
+ let index_used_directly = matches!(idx.kind, ExprKind::Path(_));
+ let res = self.cx.qpath_res(seqpath, seqexpr.hir_id);
+ match res {
+ Res::Local(hir_id) => {
+ let parent_def_id = self.cx.tcx.hir().get_parent_item(expr.hir_id);
+ let extent = self.cx
+ .tcx
+ .region_scope_tree(parent_def_id)
+ .var_scope(hir_id.local_id)
+ .unwrap();
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (Some(extent), self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
+ self.indexed_indirectly.insert(seqvar.segments[0].ident.name, Some(extent));
+ }
+ return false; // no need to walk further *on the variable*
+ }
+ Res::Def(DefKind::Static (_)| DefKind::Const, ..) => {
+ if index_used_directly {
+ self.indexed_directly.insert(
+ seqvar.segments[0].ident.name,
+ (None, self.cx.typeck_results().node_type(seqexpr.hir_id)),
+ );
+ } else {
+ self.indexed_indirectly.insert(seqvar.segments[0].ident.name, None);
+ }
+ return false; // no need to walk further *on the variable*
+ }
+ _ => (),
+ }
+ }
+ }
+ true
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for VarVisitor<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ // a range index op
+ if let ExprKind::MethodCall(meth, [args_0, args_1, ..], _) = &expr.kind;
+ if (meth.ident.name == sym::index && match_trait_method(self.cx, expr, &paths::INDEX))
+ || (meth.ident.name == sym::index_mut && match_trait_method(self.cx, expr, &paths::INDEX_MUT));
+ if !self.check(args_1, args_0, expr);
+ then { return }
+ }
+
+ if_chain! {
+ // an index op
+ if let ExprKind::Index(seqexpr, idx) = expr.kind;
+ if !self.check(idx, seqexpr, expr);
+ then { return }
+ }
+
+ if_chain! {
+ // directly using a variable
+ if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind;
+ if let Res::Local(local_id) = path.res;
+ then {
+ if local_id == self.var {
+ self.nonindex = true;
+ } else {
+ // not the correct variable, but still a variable
+ self.referenced.insert(path.segments[0].ident.name);
+ }
+ }
+ }
+
+ let old = self.prefer_mutable;
+ match expr.kind {
+ ExprKind::AssignOp(_, lhs, rhs) | ExprKind::Assign(lhs, rhs, _) => {
+ self.prefer_mutable = true;
+ self.visit_expr(lhs);
+ self.prefer_mutable = false;
+ self.visit_expr(rhs);
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, mutbl, expr) => {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ self.visit_expr(expr);
+ },
+ ExprKind::Call(f, args) => {
+ self.visit_expr(f);
+ for expr in args {
+ let ty = self.cx.typeck_results().expr_ty_adjusted(expr);
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::MethodCall(_, args, _) => {
+ let def_id = self.cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
+ for (ty, expr) in iter::zip(self.cx.tcx.fn_sig(def_id).inputs().skip_binder(), args) {
+ self.prefer_mutable = false;
+ if let ty::Ref(_, _, mutbl) = *ty.kind() {
+ if mutbl == Mutability::Mut {
+ self.prefer_mutable = true;
+ }
+ }
+ self.visit_expr(expr);
+ }
+ },
+ ExprKind::Closure(&Closure { body, .. }) => {
+ let body = self.cx.tcx.hir().body(body);
+ self.visit_expr(&body.value);
+ },
+ _ => walk_expr(self, expr),
+ }
+ self.prefer_mutable = old;
+ }
+}
--- /dev/null
--- /dev/null
++use clippy_utils::diagnostics::span_lint_and_sugg;
++use rustc_errors::Applicability;
++use rustc_hir::{BinOpKind, Expr, ExprKind};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::source_map::Spanned;
++
++declare_clippy_lint! {
++ /// ### What it does
++ /// Lints subtraction between `Instant::now()` and another `Instant`.
++ ///
++ /// ### Why is this bad?
++ /// It is easy to accidentally write `prev_instant - Instant::now()`, which will always be 0ns
++ /// as `Instant` subtraction saturates.
++ ///
++ /// `prev_instant.elapsed()` also more clearly signals intention.
++ ///
++ /// ### Example
++ /// ```rust
++ /// use std::time::Instant;
++ /// let prev_instant = Instant::now();
++ /// let duration = Instant::now() - prev_instant;
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// use std::time::Instant;
++ /// let prev_instant = Instant::now();
++ /// let duration = prev_instant.elapsed();
++ /// ```
++ #[clippy::version = "1.64.0"]
++ pub MANUAL_INSTANT_ELAPSED,
++ pedantic,
++ "subtraction between `Instant::now()` and previous `Instant`"
++}
++
++declare_lint_pass!(ManualInstantElapsed => [MANUAL_INSTANT_ELAPSED]);
++
++impl LateLintPass<'_> for ManualInstantElapsed {
++ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'_ Expr<'_>) {
++ if let ExprKind::Binary(Spanned {node: BinOpKind::Sub, ..}, lhs, rhs) = expr.kind
++ && check_instant_now_call(cx, lhs)
++ && let ty_resolved = cx.typeck_results().expr_ty(rhs)
++ && let rustc_middle::ty::Adt(def, _) = ty_resolved.kind()
++ && clippy_utils::match_def_path(cx, def.did(), &clippy_utils::paths::INSTANT)
++ && let Some(sugg) = clippy_utils::sugg::Sugg::hir_opt(cx, rhs)
++ {
++ span_lint_and_sugg(
++ cx,
++ MANUAL_INSTANT_ELAPSED,
++ expr.span,
++ "manual implementation of `Instant::elapsed`",
++ "try",
++ format!("{}.elapsed()", sugg.maybe_par()),
++ Applicability::MachineApplicable,
++ );
++ }
++ }
++}
++
++fn check_instant_now_call(cx: &LateContext<'_>, expr_block: &'_ Expr<'_>) -> bool {
++ if let ExprKind::Call(fn_expr, []) = expr_block.kind
++ && let Some(fn_id) = clippy_utils::path_def_id(cx, fn_expr)
++ && clippy_utils::match_def_path(cx, fn_id, &clippy_utils::paths::INSTANT_NOW)
++ {
++ true
++ } else {
++ false
++ }
++}
--- /dev/null
- if let ExprKind::MethodCall(method_segment, args, _) = scrutinee.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{indent_of, reindent_multiline, snippet_opt};
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{is_lang_ctor, path_to_local_id};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::LangItem::{ResultErr, ResultOk};
+use rustc_hir::{Closure, Expr, ExprKind, PatKind};
+use rustc_lint::LintContext;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///
+ /// Finds patterns that reimplement `Option::ok_or`.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// Concise code helps focusing on behavior instead of boilerplate.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.map_or(Err("error"), |v| Ok(v));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.ok_or("error");
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_OK_OR,
+ pedantic,
+ "finds patterns that can be encoded more concisely with `Option::ok_or`"
+}
+
+declare_lint_pass!(ManualOkOr => [MANUAL_OK_OR]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualOkOr {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, scrutinee: &'tcx Expr<'tcx>) {
+ if in_external_macro(cx.sess(), scrutinee.span) {
+ return;
+ }
+
+ if_chain! {
- if args.len() == 3;
- let method_receiver = &args[0];
- let ty = cx.typeck_results().expr_ty(method_receiver);
++ if let ExprKind::MethodCall(method_segment, [receiver, or_expr, map_expr], _) = scrutinee.kind;
+ if method_segment.ident.name == sym!(map_or);
- let or_expr = &args[1];
- if is_ok_wrapping(cx, &args[2]);
++ let ty = cx.typeck_results().expr_ty(receiver);
+ if is_type_diagnostic_item(cx, ty, sym::Option);
- if let Some(method_receiver_snippet) = snippet_opt(cx, method_receiver.span);
++ if is_ok_wrapping(cx, map_expr);
+ if let ExprKind::Call(Expr { kind: ExprKind::Path(err_path), .. }, &[ref err_arg]) = or_expr.kind;
+ if is_lang_ctor(cx, err_path, ResultErr);
++ if let Some(method_receiver_snippet) = snippet_opt(cx, receiver.span);
+ if let Some(err_arg_snippet) = snippet_opt(cx, err_arg.span);
+ if let Some(indent) = indent_of(cx, scrutinee.span);
+ then {
+ let reindented_err_arg_snippet =
+ reindent_multiline(err_arg_snippet.into(), true, Some(indent + 4));
+ span_lint_and_sugg(
+ cx,
+ MANUAL_OK_OR,
+ scrutinee.span,
+ "this pattern reimplements `Option::ok_or`",
+ "replace with",
+ format!(
+ "{}.ok_or({})",
+ method_receiver_snippet,
+ reindented_err_arg_snippet
+ ),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+fn is_ok_wrapping(cx: &LateContext<'_>, map_expr: &Expr<'_>) -> bool {
+ if let ExprKind::Path(ref qpath) = map_expr.kind {
+ if is_lang_ctor(cx, qpath, ResultOk) {
+ return true;
+ }
+ }
+ if_chain! {
+ if let ExprKind::Closure(&Closure { body, .. }) = map_expr.kind;
+ let body = cx.tcx.hir().body(body);
+ if let PatKind::Binding(_, param_id, ..) = body.params[0].pat.kind;
+ if let ExprKind::Call(Expr { kind: ExprKind::Path(ok_path), .. }, &[ref ok_arg]) = body.value.kind;
+ if is_lang_ctor(cx, ok_path, ResultOk);
+ then { path_to_local_id(ok_arg, param_id) } else { false }
+ }
+}
--- /dev/null
- if let ExprKind::MethodCall(method, args, _) = e.kind {
+use clippy_utils::diagnostics::span_lint_and_help;
+use rustc_hir::{CaptureBy, Closure, Expr, ExprKind, PatKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for instances of `map_err(|_| Some::Enum)`
+ ///
+ /// ### Why is this bad?
+ /// This `map_err` throws away the original error rather than allowing the enum to contain and report the cause of the error
+ ///
+ /// ### Example
+ /// Before:
+ /// ```rust
+ /// use std::fmt;
+ ///
+ /// #[derive(Debug)]
+ /// enum Error {
+ /// Indivisible,
+ /// Remainder(u8),
+ /// }
+ ///
+ /// impl fmt::Display for Error {
+ /// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ /// match self {
+ /// Error::Indivisible => write!(f, "could not divide input by three"),
+ /// Error::Remainder(remainder) => write!(
+ /// f,
+ /// "input is not divisible by three, remainder = {}",
+ /// remainder
+ /// ),
+ /// }
+ /// }
+ /// }
+ ///
+ /// impl std::error::Error for Error {}
+ ///
+ /// fn divisible_by_3(input: &str) -> Result<(), Error> {
+ /// input
+ /// .parse::<i32>()
+ /// .map_err(|_| Error::Indivisible)
+ /// .map(|v| v % 3)
+ /// .and_then(|remainder| {
+ /// if remainder == 0 {
+ /// Ok(())
+ /// } else {
+ /// Err(Error::Remainder(remainder as u8))
+ /// }
+ /// })
+ /// }
+ /// ```
+ ///
+ /// After:
+ /// ```rust
+ /// use std::{fmt, num::ParseIntError};
+ ///
+ /// #[derive(Debug)]
+ /// enum Error {
+ /// Indivisible(ParseIntError),
+ /// Remainder(u8),
+ /// }
+ ///
+ /// impl fmt::Display for Error {
+ /// fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ /// match self {
+ /// Error::Indivisible(_) => write!(f, "could not divide input by three"),
+ /// Error::Remainder(remainder) => write!(
+ /// f,
+ /// "input is not divisible by three, remainder = {}",
+ /// remainder
+ /// ),
+ /// }
+ /// }
+ /// }
+ ///
+ /// impl std::error::Error for Error {
+ /// fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+ /// match self {
+ /// Error::Indivisible(source) => Some(source),
+ /// _ => None,
+ /// }
+ /// }
+ /// }
+ ///
+ /// fn divisible_by_3(input: &str) -> Result<(), Error> {
+ /// input
+ /// .parse::<i32>()
+ /// .map_err(Error::Indivisible)
+ /// .map(|v| v % 3)
+ /// .and_then(|remainder| {
+ /// if remainder == 0 {
+ /// Ok(())
+ /// } else {
+ /// Err(Error::Remainder(remainder as u8))
+ /// }
+ /// })
+ /// }
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub MAP_ERR_IGNORE,
+ restriction,
+ "`map_err` should not ignore the original error"
+}
+
+declare_lint_pass!(MapErrIgnore => [MAP_ERR_IGNORE]);
+
+impl<'tcx> LateLintPass<'tcx> for MapErrIgnore {
+ // do not try to lint if this is from a macro or desugaring
+ fn check_expr(&mut self, cx: &LateContext<'_>, e: &Expr<'_>) {
+ if e.span.from_expansion() {
+ return;
+ }
+
+ // check if this is a method call (e.g. x.foo())
- if method.ident.as_str() == "map_err" && args.len() == 2 {
++ if let ExprKind::MethodCall(method, [_, arg], _) = e.kind {
+ // only work if the method name is `map_err` and there are only 2 arguments (e.g. x.map_err(|_|[1]
+ // Enum::Variant[2]))
- }) = args[1].kind
++ if method.ident.name == sym!(map_err) {
+ // make sure the first argument is a closure, and grab the CaptureRef, BodyId, and fn_decl_span
+ // fields
+ if let ExprKind::Closure(&Closure {
+ capture_clause,
+ body,
+ fn_decl_span,
+ ..
++ }) = arg.kind
+ {
+ // check if this is by Reference (meaning there's no move statement)
+ if capture_clause == CaptureBy::Ref {
+ // Get the closure body to check the parameters and values
+ let closure_body = cx.tcx.hir().body(body);
+ // make sure there's only one parameter (`|_|`)
+ if closure_body.params.len() == 1 {
+ // make sure that parameter is the wild token (`_`)
+ if let PatKind::Wild = closure_body.params[0].pat.kind {
+ // span the area of the closure capture and warn that the
+ // original error will be thrown away
+ span_lint_and_help(
+ cx,
+ MAP_ERR_IGNORE,
+ fn_decl_span,
+ "`map_err(|_|...` wildcard pattern discards the original error",
+ None,
+ "consider storing the original error as a source in the new error, or silence this warning using an ignored identifier (`.map_err(|_foo| ...`)",
+ );
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+}
--- /dev/null
- match ty.kind() {
- ty::Tuple(slice) => slice.is_empty(),
- ty::Never => true,
- _ => false,
- }
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::source::{snippet, snippet_with_applicability, snippet_with_context};
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{iter_input_pats, method_chain_args};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `option.map(f)` where f is a function
+ /// or closure that returns the unit type `()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more clearly with
+ /// an if let statement
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn do_stuff() -> Option<String> { Some(String::new()) }
+ /// # fn log_err_msg(foo: String) -> Option<String> { Some(foo) }
+ /// # fn format_msg(foo: String) -> String { String::new() }
+ /// let x: Option<String> = do_stuff();
+ /// x.map(log_err_msg);
+ /// # let x: Option<String> = do_stuff();
+ /// x.map(|msg| log_err_msg(format_msg(msg)));
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// # fn do_stuff() -> Option<String> { Some(String::new()) }
+ /// # fn log_err_msg(foo: String) -> Option<String> { Some(foo) }
+ /// # fn format_msg(foo: String) -> String { String::new() }
+ /// let x: Option<String> = do_stuff();
+ /// if let Some(msg) = x {
+ /// log_err_msg(msg);
+ /// }
+ ///
+ /// # let x: Option<String> = do_stuff();
+ /// if let Some(msg) = x {
+ /// log_err_msg(format_msg(msg));
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OPTION_MAP_UNIT_FN,
+ complexity,
+ "using `option.map(f)`, where `f` is a function or closure that returns `()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `result.map(f)` where f is a function
+ /// or closure that returns the unit type `()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more clearly with
+ /// an if let statement
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn do_stuff() -> Result<String, String> { Ok(String::new()) }
+ /// # fn log_err_msg(foo: String) -> Result<String, String> { Ok(foo) }
+ /// # fn format_msg(foo: String) -> String { String::new() }
+ /// let x: Result<String, String> = do_stuff();
+ /// x.map(log_err_msg);
+ /// # let x: Result<String, String> = do_stuff();
+ /// x.map(|msg| log_err_msg(format_msg(msg)));
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// # fn do_stuff() -> Result<String, String> { Ok(String::new()) }
+ /// # fn log_err_msg(foo: String) -> Result<String, String> { Ok(foo) }
+ /// # fn format_msg(foo: String) -> String { String::new() }
+ /// let x: Result<String, String> = do_stuff();
+ /// if let Ok(msg) = x {
+ /// log_err_msg(msg);
+ /// };
+ /// # let x: Result<String, String> = do_stuff();
+ /// if let Ok(msg) = x {
+ /// log_err_msg(format_msg(msg));
+ /// };
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RESULT_MAP_UNIT_FN,
+ complexity,
+ "using `result.map(f)`, where `f` is a function or closure that returns `()`"
+}
+
+declare_lint_pass!(MapUnit => [OPTION_MAP_UNIT_FN, RESULT_MAP_UNIT_FN]);
+
+fn is_unit_type(ty: Ty<'_>) -> bool {
++ ty.is_unit() || ty.is_never()
+}
+
+fn is_unit_function(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
+ let ty = cx.typeck_results().expr_ty(expr);
+
+ if let ty::FnDef(id, _) = *ty.kind() {
+ if let Some(fn_type) = cx.tcx.fn_sig(id).no_bound_vars() {
+ return is_unit_type(fn_type.output());
+ }
+ }
+ false
+}
+
+fn is_unit_expression(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> bool {
+ is_unit_type(cx.typeck_results().expr_ty(expr))
+}
+
+/// The expression inside a closure may or may not have surrounding braces and
+/// semicolons, which causes problems when generating a suggestion. Given an
+/// expression that evaluates to '()' or '!', recursively remove useless braces
+/// and semi-colons until is suitable for including in the suggestion template
+fn reduce_unit_expression<'a>(cx: &LateContext<'_>, expr: &'a hir::Expr<'_>) -> Option<Span> {
+ if !is_unit_expression(cx, expr) {
+ return None;
+ }
+
+ match expr.kind {
+ hir::ExprKind::Call(_, _) | hir::ExprKind::MethodCall(..) => {
+ // Calls can't be reduced any more
+ Some(expr.span)
+ },
+ hir::ExprKind::Block(block, _) => {
+ match (block.stmts, block.expr.as_ref()) {
+ (&[], Some(inner_expr)) => {
+ // If block only contains an expression,
+ // reduce `{ X }` to `X`
+ reduce_unit_expression(cx, inner_expr)
+ },
+ (&[ref inner_stmt], None) => {
+ // If block only contains statements,
+ // reduce `{ X; }` to `X` or `X;`
+ match inner_stmt.kind {
+ hir::StmtKind::Local(local) => Some(local.span),
+ hir::StmtKind::Expr(e) => Some(e.span),
+ hir::StmtKind::Semi(..) => Some(inner_stmt.span),
+ hir::StmtKind::Item(..) => None,
+ }
+ },
+ _ => {
+ // For closures that contain multiple statements
+ // it's difficult to get a correct suggestion span
+ // for all cases (multi-line closures specifically)
+ //
+ // We do not attempt to build a suggestion for those right now.
+ None
+ },
+ }
+ },
+ _ => None,
+ }
+}
+
+fn unit_closure<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'_>,
+) -> Option<(&'tcx hir::Param<'tcx>, &'tcx hir::Expr<'tcx>)> {
+ if_chain! {
+ if let hir::ExprKind::Closure(&hir::Closure { fn_decl, body, .. }) = expr.kind;
+ let body = cx.tcx.hir().body(body);
+ let body_expr = &body.value;
+ if fn_decl.inputs.len() == 1;
+ if is_unit_expression(cx, body_expr);
+ if let Some(binding) = iter_input_pats(fn_decl, body).next();
+ then {
+ return Some((binding, body_expr));
+ }
+ }
+ None
+}
+
+/// Builds a name for the let binding variable (`var_arg`)
+///
+/// `x.field` => `x_field`
+/// `y` => `_y`
+///
+/// Anything else will return `a`.
+fn let_binding_name(cx: &LateContext<'_>, var_arg: &hir::Expr<'_>) -> String {
+ match &var_arg.kind {
+ hir::ExprKind::Field(_, _) => snippet(cx, var_arg.span, "_").replace('.', "_"),
+ hir::ExprKind::Path(_) => format!("_{}", snippet(cx, var_arg.span, "")),
+ _ => "a".to_string(),
+ }
+}
+
+#[must_use]
+fn suggestion_msg(function_type: &str, map_type: &str) -> String {
+ format!(
+ "called `map(f)` on an `{0}` value where `f` is a {1} that returns the unit type `()`",
+ map_type, function_type
+ )
+}
+
+fn lint_map_unit_fn(cx: &LateContext<'_>, stmt: &hir::Stmt<'_>, expr: &hir::Expr<'_>, map_args: &[hir::Expr<'_>]) {
+ let var_arg = &map_args[0];
+
+ let (map_type, variant, lint) = if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(var_arg), sym::Option) {
+ ("Option", "Some", OPTION_MAP_UNIT_FN)
+ } else if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(var_arg), sym::Result) {
+ ("Result", "Ok", RESULT_MAP_UNIT_FN)
+ } else {
+ return;
+ };
+ let fn_arg = &map_args[1];
+
+ if is_unit_function(cx, fn_arg) {
+ let mut applicability = Applicability::MachineApplicable;
+ let msg = suggestion_msg("function", map_type);
+ let suggestion = format!(
+ "if let {0}({binding}) = {1} {{ {2}({binding}) }}",
+ variant,
+ snippet_with_applicability(cx, var_arg.span, "_", &mut applicability),
+ snippet_with_applicability(cx, fn_arg.span, "_", &mut applicability),
+ binding = let_binding_name(cx, var_arg)
+ );
+
+ span_lint_and_then(cx, lint, expr.span, &msg, |diag| {
+ diag.span_suggestion(stmt.span, "try this", suggestion, applicability);
+ });
+ } else if let Some((binding, closure_expr)) = unit_closure(cx, fn_arg) {
+ let msg = suggestion_msg("closure", map_type);
+
+ span_lint_and_then(cx, lint, expr.span, &msg, |diag| {
+ if let Some(reduced_expr_span) = reduce_unit_expression(cx, closure_expr) {
+ let mut applicability = Applicability::MachineApplicable;
+ let suggestion = format!(
+ "if let {0}({1}) = {2} {{ {3} }}",
+ variant,
+ snippet_with_applicability(cx, binding.pat.span, "_", &mut applicability),
+ snippet_with_applicability(cx, var_arg.span, "_", &mut applicability),
+ snippet_with_context(cx, reduced_expr_span, var_arg.span.ctxt(), "_", &mut applicability).0,
+ );
+ diag.span_suggestion(stmt.span, "try this", suggestion, applicability);
+ } else {
+ let suggestion = format!(
+ "if let {0}({1}) = {2} {{ ... }}",
+ variant,
+ snippet(cx, binding.pat.span, "_"),
+ snippet(cx, var_arg.span, "_"),
+ );
+ diag.span_suggestion(stmt.span, "try this", suggestion, Applicability::HasPlaceholders);
+ }
+ });
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for MapUnit {
+ fn check_stmt(&mut self, cx: &LateContext<'_>, stmt: &hir::Stmt<'_>) {
+ if stmt.span.from_expansion() {
+ return;
+ }
+
+ if let hir::StmtKind::Semi(expr) = stmt.kind {
+ if let Some(arglists) = method_chain_args(expr, &["map"]) {
+ lint_map_unit_fn(cx, stmt, expr, arglists[0]);
+ }
+ }
+ }
+}
--- /dev/null
- if let ExprKind::Call(e, args) = peel_blocks(arm.body).kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::{is_lang_ctor, peel_blocks};
+use rustc_errors::Applicability;
+use rustc_hir::{Arm, BindingAnnotation, Expr, ExprKind, LangItem, PatKind, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+
+use super::MATCH_AS_REF;
+
+pub(crate) fn check(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ if arms.len() == 2 && arms[0].guard.is_none() && arms[1].guard.is_none() {
+ let arm_ref: Option<BindingAnnotation> = if is_none_arm(cx, &arms[0]) {
+ is_ref_some_arm(cx, &arms[1])
+ } else if is_none_arm(cx, &arms[1]) {
+ is_ref_some_arm(cx, &arms[0])
+ } else {
+ None
+ };
+ if let Some(rb) = arm_ref {
+ let suggestion = if rb == BindingAnnotation::Ref {
+ "as_ref"
+ } else {
+ "as_mut"
+ };
+
+ let output_ty = cx.typeck_results().expr_ty(expr);
+ let input_ty = cx.typeck_results().expr_ty(ex);
+
+ let cast = if_chain! {
+ if let ty::Adt(_, substs) = input_ty.kind();
+ let input_ty = substs.type_at(0);
+ if let ty::Adt(_, substs) = output_ty.kind();
+ let output_ty = substs.type_at(0);
+ if let ty::Ref(_, output_ty, _) = *output_ty.kind();
+ if input_ty != output_ty;
+ then {
+ ".map(|x| x as _)"
+ } else {
+ ""
+ }
+ };
+
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ MATCH_AS_REF,
+ expr.span,
+ &format!("use `{}()` instead", suggestion),
+ "try this",
+ format!(
+ "{}.{}(){}",
+ snippet_with_applicability(cx, ex.span, "_", &mut applicability),
+ suggestion,
+ cast,
+ ),
+ applicability,
+ );
+ }
+ }
+}
+
+// Checks if arm has the form `None => None`
+fn is_none_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ matches!(arm.pat.kind, PatKind::Path(ref qpath) if is_lang_ctor(cx, qpath, LangItem::OptionNone))
+}
+
+// Checks if arm has the form `Some(ref v) => Some(v)` (checks for `ref` and `ref mut`)
+fn is_ref_some_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> Option<BindingAnnotation> {
+ if_chain! {
+ if let PatKind::TupleStruct(ref qpath, [first_pat, ..], _) = arm.pat.kind;
+ if is_lang_ctor(cx, qpath, LangItem::OptionSome);
+ if let PatKind::Binding(rb, .., ident, _) = first_pat.kind;
+ if rb == BindingAnnotation::Ref || rb == BindingAnnotation::RefMut;
- if is_lang_ctor(cx, some_path, LangItem::OptionSome) && args.len() == 1;
- if let ExprKind::Path(QPath::Resolved(_, path2)) = args[0].kind;
++ if let ExprKind::Call(e, [arg]) = peel_blocks(arm.body).kind;
+ if let ExprKind::Path(ref some_path) = e.kind;
++ if is_lang_ctor(cx, some_path, LangItem::OptionSome);
++ if let ExprKind::Path(QPath::Resolved(_, path2)) = arg.kind;
+ if path2.segments.len() == 1 && ident.name == path2.segments[0].ident.name;
+ then {
+ return Some(rb)
+ }
+ }
+ None
+}
--- /dev/null
- use clippy_utils::source::{snippet_opt, span_starts_with, walk_span_to_context};
- use clippy_utils::{higher, in_constant, meets_msrv, msrvs};
+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;
+
- suspicious,
++use clippy_utils::source::{snippet_opt, walk_span_to_context};
++use clippy_utils::{higher, in_constant, is_span_match, meets_msrv, msrvs};
+use rustc_hir::{Arm, Expr, ExprKind, Local, MatchSource, Pat};
+use rustc_lexer::{tokenize, TokenKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{Span, SpanData, SyntaxContext};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with a single arm where an `if let`
+ /// will usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => (),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH,
+ style,
+ "a `match` statement with a single nontrivial arm (i.e., where the other arm is `_ => {}`) instead of `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with two arms where an `if let else` will
+ /// usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Known problems
+ /// Personal style preferences may differ.
+ ///
+ /// ### Example
+ /// Using `match`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => bar(&other_ref),
+ /// }
+ /// ```
+ ///
+ /// Using `if let` with `else`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// } else {
+ /// bar(&other_ref);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH_ELSE,
+ pedantic,
+ "a `match` statement with two arms where the second arm's pattern is a placeholder instead of a specific match pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where all arms match a reference,
+ /// suggesting to remove the reference and deref the matched expression
+ /// instead. It also checks for `if let &foo = bar` blocks.
+ ///
+ /// ### Why is this bad?
+ /// It just makes the code less readable. That reference
+ /// destructuring adds nothing to the code.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match x {
+ /// &A(ref y) => foo(y),
+ /// &B => bar(),
+ /// _ => frob(&x),
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// match *x {
+ /// A(ref y) => foo(y),
+ /// B => bar(),
+ /// _ => frob(x),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_REF_PATS,
+ style,
+ "a `match` or `if let` with all arms prefixed with `&` instead of deref-ing the match expression"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where match expression is a `bool`. It
+ /// suggests to replace the expression with an `if...else` block.
+ ///
+ /// ### Why is this bad?
+ /// It makes the code less readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// match condition {
+ /// true => foo(),
+ /// false => bar(),
+ /// }
+ /// ```
+ /// Use if/else instead:
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// if condition {
+ /// foo();
+ /// } else {
+ /// bar();
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_BOOL,
+ pedantic,
+ "a `match` on a boolean expression instead of an `if..else` block"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for overlapping match arms.
+ ///
+ /// ### Why is this bad?
+ /// It is likely to be an error and if not, makes the code
+ /// less obvious.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 5;
+ /// match x {
+ /// 1..=10 => println!("1 ... 10"),
+ /// 5..=15 => println!("5 ... 15"),
+ /// _ => (),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_OVERLAPPING_ARM,
+ style,
+ "a `match` with overlapping arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arm which matches all errors with `Err(_)`
+ /// and take drastic actions like `panic!`.
+ ///
+ /// ### Why is this bad?
+ /// It is generally a bad practice, similar to
+ /// catching all exceptions in java with `catch(Exception)`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Result<i32, &str> = Ok(3);
+ /// match x {
+ /// Ok(_) => println!("ok"),
+ /// Err(_) => panic!("err"),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_WILD_ERR_ARM,
+ pedantic,
+ "a `match` with `Err(_)` arm and take drastic actions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for match which is used to add a reference to an
+ /// `Option` value.
+ ///
+ /// ### Why is this bad?
+ /// Using `as_ref()` or `as_mut()` instead is shorter.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = match x {
+ /// None => None,
+ /// Some(ref v) => Some(v),
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// let r: Option<&()> = x.as_ref();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_AS_REF,
+ complexity,
+ "a `match` on an Option value instead of using `as_ref()` or `as_mut`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches using `_`.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect if guards exhaustively cover some
+ /// variants, and also may not use correct path to enum if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// match x {
+ /// Foo::A(_) => {},
+ /// Foo::B(_) => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub WILDCARD_ENUM_MATCH_ARM,
+ restriction,
+ "a wildcard enum match arm using `_`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches for a single variant.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may not use correct path to enum
+ /// if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// Foo::C => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ pedantic,
+ "a wildcard enum match for a single variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard pattern used with others patterns in same match arm.
+ ///
+ /// ### Why is this bad?
+ /// Wildcard pattern already covers any other pattern as it will match anyway.
+ /// It makes the code less readable, especially to spot wildcard pattern use in match arm.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// "bar" | _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let s = "foo";
+ /// match s {
+ /// "a" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub WILDCARD_IN_OR_PATTERNS,
+ complexity,
+ "a wildcard pattern used with others patterns in same match arm"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches being used to destructure a single-variant enum
+ /// or tuple struct where a `let` will suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `let` doesn't nest, whereas a `match` does.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ ///
+ /// let data = match wrapper {
+ /// Wrapper::Data(i) => i,
+ /// };
+ /// ```
+ ///
+ /// The correct use would be:
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ /// let Wrapper::Data(data) = wrapper;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INFALLIBLE_DESTRUCTURING_MATCH,
+ style,
+ "a `match` statement with a single infallible arm instead of a `let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for useless match that binds to only one value.
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect when `match`
+ /// is actually binding temporary value, bringing a 'dropped while borrowed' error.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// match (a, b) {
+ /// (c, d) => {
+ /// // useless match
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ /// let (c, d) = (a, b);
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub MATCH_SINGLE_BINDING,
+ complexity,
+ "a match with a single binding instead of using `let` statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary '..' pattern binding on struct when all fields are explicitly matched.
+ ///
+ /// ### Why is this bad?
+ /// Correctness and readability. It's like having a wildcard pattern after
+ /// matching all enum variants explicitly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// let a = A { a: 5 };
+ ///
+ /// match a {
+ /// A { a: 5, .. } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// # let a = A { a: 5 };
+ /// match a {
+ /// A { a: 5 } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ restriction,
+ "a match on a struct that binds all fields but still uses the wildcard pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lint for redundant pattern matching over `Result`, `Option`,
+ /// `std::task::Poll` or `std::net::IpAddr`
+ ///
+ /// ### Why is this bad?
+ /// It's more concise and clear to just use the proper
+ /// utility function
+ ///
+ /// ### Known problems
+ /// This will change the drop order for the matched type. Both `if let` and
+ /// `while let` will drop the value at the end of the block, both `if` and `while` will drop the
+ /// value before entering the block. For most types this change will not matter, but for a few
+ /// types this will not be an acceptable change (e.g. locks). See the
+ /// [reference](https://doc.rust-lang.org/reference/destructors.html#drop-scopes) for more about
+ /// drop order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if let Ok(_) = Ok::<i32, i32>(42) {}
+ /// if let Err(_) = Err::<i32, i32>(42) {}
+ /// if let None = None::<()> {}
+ /// if let Some(_) = Some(42) {}
+ /// if let Poll::Pending = Poll::Pending::<()> {}
+ /// if let Poll::Ready(_) = Poll::Ready(42) {}
+ /// if let IpAddr::V4(_) = IpAddr::V4(Ipv4Addr::LOCALHOST) {}
+ /// if let IpAddr::V6(_) = IpAddr::V6(Ipv6Addr::LOCALHOST) {}
+ /// match Ok::<i32, i32>(42) {
+ /// Ok(_) => true,
+ /// Err(_) => false,
+ /// };
+ /// ```
+ ///
+ /// The more idiomatic use would be:
+ ///
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if Ok::<i32, i32>(42).is_ok() {}
+ /// if Err::<i32, i32>(42).is_err() {}
+ /// if None::<()>.is_none() {}
+ /// if Some(42).is_some() {}
+ /// if Poll::Pending::<()>.is_pending() {}
+ /// if Poll::Ready(42).is_ready() {}
+ /// if IpAddr::V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
+ /// if IpAddr::V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
+ /// Ok::<i32, i32>(42).is_ok();
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub REDUNDANT_PATTERN_MATCHING,
+ style,
+ "use the proper utility function avoiding an `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` or `if let` expressions producing a
+ /// `bool` that could be written using `matches!`
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// This lint falsely triggers, if there are arms with
+ /// `cfg` attributes that remove an arm evaluating to `false`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(5);
+ ///
+ /// let a = match x {
+ /// Some(0) => true,
+ /// _ => false,
+ /// };
+ ///
+ /// let a = if let Some(0) = x {
+ /// true
+ /// } else {
+ /// false
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let x = Some(5);
+ /// let a = matches!(x, Some(0));
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MATCH_LIKE_MATCHES_MACRO,
+ style,
+ "a match that could be written with the matches! macro"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` with identical arm bodies.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error. If arm bodies
+ /// are the same on purpose, you can factor them
+ /// [using `|`](https://doc.rust-lang.org/book/patterns.html#multiple-patterns).
+ ///
+ /// ### Known problems
+ /// False positive possible with order dependent `match`
+ /// (see issue
+ /// [#860](https://github.com/rust-lang/rust-clippy/issues/860)).
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => bar(), // <= oops
+ /// }
+ /// ```
+ ///
+ /// This should probably be
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => baz(), // <= fixed
+ /// }
+ /// ```
+ ///
+ /// or if the original code was not a typo:
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar | Baz => bar(), // <= shows the intent better
+ /// Quz => quz(),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_SAME_ARMS,
+ pedantic,
+ "`match` with identical arm bodies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary `match` or match-like `if let` returns for `Option` and `Result`
+ /// when function signatures are the same.
+ ///
+ /// ### Why is this bad?
+ /// This `match` block does nothing and might not be what the coder intended.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// match result {
+ /// Ok(val) => Ok(val),
+ /// Err(err) => Err(err),
+ /// }
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// if let Some(val) = option {
+ /// Some(val)
+ /// } else {
+ /// None
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Could be replaced as
+ ///
+ /// ```rust,ignore
+ /// fn foo() -> Result<(), i32> {
+ /// result
+ /// }
+ ///
+ /// fn bar() -> Option<i32> {
+ /// option
+ /// }
+ /// ```
+ #[clippy::version = "1.61.0"]
+ pub NEEDLESS_MATCH,
+ complexity,
+ "`match` or match-like `if let` that are unnecessary"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds nested `match` or `if let` expressions where the patterns may be "collapsed" together
+ /// without adding any branches.
+ ///
+ /// Note that this lint is not intended to find _all_ cases where nested match patterns can be merged, but only
+ /// cases where merging would most likely make the code more readable.
+ ///
+ /// ### Why is this bad?
+ /// It is unnecessarily verbose and complex.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(n) => match n {
+ /// Ok(n) => n,
+ /// _ => return,
+ /// }
+ /// None => return,
+ /// };
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn func(opt: Option<Result<u64, String>>) {
+ /// let n = match opt {
+ /// Some(Ok(n)) => n,
+ /// _ => return,
+ /// };
+ /// }
+ /// ```
+ #[clippy::version = "1.50.0"]
+ pub COLLAPSIBLE_MATCH,
+ style,
+ "Nested `match` or `if let` expressions where the patterns may be \"collapsed\" together."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Finds patterns that reimplement `Option::unwrap_or` or `Result::unwrap_or`.
+ ///
+ /// ### Why is this bad?
+ /// Concise code helps focusing on behavior instead of boilerplate.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// match foo {
+ /// Some(v) => v,
+ /// None => 1,
+ /// };
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let foo: Option<i32> = None;
+ /// foo.unwrap_or(1);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_UNWRAP_OR,
+ complexity,
+ "finds patterns that can be encoded more concisely with `Option::unwrap_or` or `Result::unwrap_or`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match vec[idx]` or `match vec[n..m]`.
+ ///
+ /// ### Why is this bad?
+ /// This can panic at runtime.
+ ///
+ /// ### Example
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr[idx] {
+ /// 0 => println!("{}", 0),
+ /// 1 => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust, no_run
+ /// let arr = vec![0, 1, 2, 3];
+ /// let idx = 1;
+ ///
+ /// match arr.get(idx) {
+ /// Some(0) => println!("{}", 0),
+ /// Some(1) => println!("{}", 3),
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_ON_VEC_ITEMS,
+ pedantic,
+ "matching on vector elements can panic"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` expressions modifying the case of a string with non-compliant arms
+ ///
+ /// ### Why is this bad?
+ /// The arm is unreachable, which is likely a mistake
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "Bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let text = "Foo";
+ /// match &*text.to_ascii_lowercase() {
+ /// "foo" => {},
+ /// "bar" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub MATCH_STR_CASE_MISMATCH,
+ correctness,
+ "creation of a case altering match expression with non-compliant arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check for temporaries returned from function calls in a match scrutinee that have the
+ /// `clippy::has_significant_drop` attribute.
+ ///
+ /// ### Why is this bad?
+ /// The `clippy::has_significant_drop` attribute can be added to types whose Drop impls have
+ /// an important side-effect, such as unlocking a mutex, making it important for users to be
+ /// able to accurately understand their lifetimes. When a temporary is returned in a function
+ /// call in a match scrutinee, its lifetime lasts until the end of the match block, which may
+ /// be surprising.
+ ///
+ /// For `Mutex`es this can lead to a deadlock. This happens when the match scrutinee uses a
+ /// function call that returns a `MutexGuard` and then tries to lock again in one of the match
+ /// arms. In that case the `MutexGuard` in the scrutinee will not be dropped until the end of
+ /// the match block and thus will not unlock.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// # use std::sync::Mutex;
+ /// # struct State {}
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
+ /// # fn bar(&self) {}
+ /// # }
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// match mutex.lock().unwrap().foo() {
+ /// true => {
+ /// mutex.lock().unwrap().bar(); // Deadlock!
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # use std::sync::Mutex;
+ /// # struct State {}
+ /// # impl State {
+ /// # fn foo(&self) -> bool {
+ /// # true
+ /// # }
+ /// # fn bar(&self) {}
+ /// # }
+ /// let mutex = Mutex::new(State {});
+ ///
+ /// let is_foo = mutex.lock().unwrap().foo();
+ /// match is_foo {
+ /// true => {
+ /// mutex.lock().unwrap().bar();
+ /// }
+ /// false => {}
+ /// };
+ ///
+ /// println!("All done!");
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub SIGNIFICANT_DROP_IN_SCRUTINEE,
- if source == MatchSource::Normal && !span_starts_with(cx, expr.span, "match") {
++ nursery,
+ "warns when a temporary of a type with a drop with a significant side-effect might have a surprising lifetime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Err(x)?`.
+ ///
+ /// ### Why is this bad?
+ /// The `?` operator is designed to allow calls that
+ /// can fail to be easily chained. For example, `foo()?.bar()` or
+ /// `foo(bar()?)`. Because `Err(x)?` can't be used that way (it will
+ /// always return), it is more clear to write `return Err(x)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// Err("failed")?;
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ /// Could be written:
+ ///
+ /// ```rust
+ /// fn foo(fail: bool) -> Result<i32, String> {
+ /// if fail {
+ /// return Err("failed".into());
+ /// }
+ /// Ok(0)
+ /// }
+ /// ```
+ #[clippy::version = "1.38.0"]
+ pub TRY_ERR,
+ restriction,
+ "return errors explicitly rather than hiding them behind a `?`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `match` which could be implemented using `map`
+ ///
+ /// ### Why is this bad?
+ /// Using the `map` method is clearer and more concise.
+ ///
+ /// ### Example
+ /// ```rust
+ /// match Some(0) {
+ /// Some(x) => Some(x + 1),
+ /// None => None,
+ /// };
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// Some(0).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub MANUAL_MAP,
+ style,
+ "reimplementation of `map`"
+}
+
+#[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 && !is_span_match(cx, expr.span) {
+ return;
+ }
+ if matches!(source, MatchSource::Normal | MatchSource::ForLoopDesugar) {
+ significant_drop_in_scrutinee::check(cx, expr, ex, arms, source);
+ }
+
+ collapsible_match::check_match(cx, arms);
+ if !from_expansion {
+ // These don't depend on a relationship between multiple arms
+ match_wild_err_arm::check(cx, ex, arms);
+ wild_in_or_pats::check(cx, arms);
+ }
+
+ if source == MatchSource::TryDesugar {
+ try_err::check(cx, expr, ex);
+ }
+
+ if !from_expansion && !contains_cfg_arm(cx, expr, ex, arms) {
+ if source == MatchSource::Normal {
+ if !(meets_msrv(self.msrv, msrvs::MATCHES_MACRO)
+ && match_like_matches::check_match(cx, expr, ex, arms))
+ {
+ match_same_arms::check(cx, arms);
+ }
+
+ redundant_pattern_match::check_match(cx, expr, ex, arms);
+ single_match::check(cx, ex, arms, expr);
+ match_bool::check(cx, ex, arms, expr);
+ overlapping_arms::check(cx, ex, arms);
+ match_wild_enum::check(cx, ex, arms);
+ match_as_ref::check(cx, ex, arms, expr);
+ needless_match::check_match(cx, ex, arms, expr);
+ match_on_vec_items::check(cx, ex);
+ match_str_case_mismatch::check(cx, ex, arms);
+
+ if !in_constant(cx, expr.hir_id) {
+ manual_unwrap_or::check(cx, expr, ex, arms);
+ manual_map::check_match(cx, expr, ex, arms);
+ }
+
+ 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 as usize;
+ (t.kind, start..pos)
+ });
+
+ // Search for the token sequence [`#`, `[`, `cfg`]
+ while iter.any(|(t, _)| matches!(t, TokenKind::Pound)) {
+ let mut iter = iter.by_ref().skip_while(|(t, _)| {
+ matches!(
+ t,
+ TokenKind::Whitespace | TokenKind::LineComment { .. } | TokenKind::BlockComment { .. }
+ )
+ });
+ if matches!(iter.next(), Some((TokenKind::OpenBracket, _)))
+ && matches!(iter.next(), Some((TokenKind::Ident, range)) if &snip[range.clone()] == "cfg")
+ {
+ return true;
+ }
+ }
+ false
+}
--- /dev/null
- if let ExprKind::Call(match_fun, try_args) = scrutinee.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{get_parent_expr, is_lang_ctor, match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::LangItem::ResultErr;
+use rustc_hir::{Expr, ExprKind, LangItem, MatchSource, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, Ty};
+use rustc_span::{hygiene, sym};
+
+use super::TRY_ERR;
+
+pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, scrutinee: &'tcx Expr<'_>) {
+ // Looks for a structure like this:
+ // match ::std::ops::Try::into_result(Err(5)) {
+ // ::std::result::Result::Err(err) =>
+ // #[allow(unreachable_code)]
+ // return ::std::ops::Try::from_error(::std::convert::From::from(err)),
+ // ::std::result::Result::Ok(val) =>
+ // #[allow(unreachable_code)]
+ // val,
+ // };
+ if_chain! {
- if let Some(try_arg) = try_args.get(0);
- if let ExprKind::Call(err_fun, err_args) = try_arg.kind;
- if let Some(err_arg) = err_args.get(0);
++ if let ExprKind::Call(match_fun, [try_arg, ..]) = scrutinee.kind;
+ if let ExprKind::Path(ref match_fun_path) = match_fun.kind;
+ if matches!(match_fun_path, QPath::LangItem(LangItem::TryTraitBranch, ..));
++ if let ExprKind::Call(err_fun, [err_arg, ..]) = try_arg.kind;
+ if let ExprKind::Path(ref err_fun_path) = err_fun.kind;
+ if is_lang_ctor(cx, err_fun_path, ResultErr);
+ if let Some(return_ty) = find_return_type(cx, &expr.kind);
+ then {
+ let prefix;
+ let suffix;
+ let err_ty;
+
+ if let Some(ty) = result_error_type(cx, return_ty) {
+ prefix = "Err(";
+ suffix = ")";
+ err_ty = ty;
+ } else if let Some(ty) = poll_result_error_type(cx, return_ty) {
+ prefix = "Poll::Ready(Err(";
+ suffix = "))";
+ err_ty = ty;
+ } else if let Some(ty) = poll_option_result_error_type(cx, return_ty) {
+ prefix = "Poll::Ready(Some(Err(";
+ suffix = ")))";
+ err_ty = ty;
+ } else {
+ return;
+ };
+
+ let expr_err_ty = cx.typeck_results().expr_ty(err_arg);
+ let span = hygiene::walk_chain(err_arg.span, try_arg.span.ctxt());
+ let mut applicability = Applicability::MachineApplicable;
+ let origin_snippet = snippet_with_applicability(cx, span, "_", &mut applicability);
+ let ret_prefix = if get_parent_expr(cx, expr).map_or(false, |e| matches!(e.kind, ExprKind::Ret(_))) {
+ "" // already returns
+ } else {
+ "return "
+ };
+ let suggestion = if err_ty == expr_err_ty {
+ format!("{}{}{}{}", ret_prefix, prefix, origin_snippet, suffix)
+ } else {
+ format!("{}{}{}.into(){}", ret_prefix, prefix, origin_snippet, suffix)
+ };
+
+ span_lint_and_sugg(
+ cx,
+ TRY_ERR,
+ expr.span,
+ "returning an `Err(_)` with the `?` operator",
+ "try this",
+ suggestion,
+ applicability,
+ );
+ }
+ }
+}
+
+/// Finds function return type by examining return expressions in match arms.
+fn find_return_type<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx ExprKind<'_>) -> Option<Ty<'tcx>> {
+ if let ExprKind::Match(_, arms, MatchSource::TryDesugar) = expr {
+ for arm in arms.iter() {
+ if let ExprKind::Ret(Some(ret)) = arm.body.kind {
+ return Some(cx.typeck_results().expr_ty(ret));
+ }
+ }
+ }
+ None
+}
+
+/// Extracts the error type from Result<T, E>.
+fn result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ if_chain! {
+ if let ty::Adt(_, subst) = ty.kind();
+ if is_type_diagnostic_item(cx, ty, sym::Result);
+ then {
+ Some(subst.type_at(1))
+ } else {
+ None
+ }
+ }
+}
+
+/// Extracts the error type from Poll<Result<T, E>>.
+fn poll_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ if_chain! {
+ if let ty::Adt(def, subst) = ty.kind();
+ if match_def_path(cx, def.did(), &paths::POLL);
+ let ready_ty = subst.type_at(0);
+
+ if let ty::Adt(ready_def, ready_subst) = ready_ty.kind();
+ if cx.tcx.is_diagnostic_item(sym::Result, ready_def.did());
+ then {
+ Some(ready_subst.type_at(1))
+ } else {
+ None
+ }
+ }
+}
+
+/// Extracts the error type from Poll<Option<Result<T, E>>>.
+fn poll_option_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ if_chain! {
+ if let ty::Adt(def, subst) = ty.kind();
+ if match_def_path(cx, def.did(), &paths::POLL);
+ let ready_ty = subst.type_at(0);
+
+ if let ty::Adt(ready_def, ready_subst) = ready_ty.kind();
+ if cx.tcx.is_diagnostic_item(sym::Option, ready_def.did());
+ let some_ty = ready_subst.type_at(0);
+
+ if let ty::Adt(some_def, some_subst) = some_ty.kind();
+ if cx.tcx.is_diagnostic_item(sym::Result, some_def.did());
+ then {
+ Some(some_subst.type_at(1))
+ } else {
+ None
+ }
+ }
+}
--- /dev/null
- if let ExprKind::Call(repl_func, repl_args) = src.kind;
- if repl_args.is_empty();
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::ty::is_non_aggregate_primitive_type;
+use clippy_utils::{is_default_equivalent, is_lang_ctor, meets_msrv, msrvs};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::LangItem::OptionNone;
+use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Span;
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `mem::replace()` on an `Option` with
+ /// `None`.
+ ///
+ /// ### Why is this bad?
+ /// `Option` already has the method `take()` for
+ /// taking its current value (Some(..) or None) and replacing it with
+ /// `None`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::mem;
+ ///
+ /// let mut an_option = Some(0);
+ /// let replaced = mem::replace(&mut an_option, None);
+ /// ```
+ /// Is better expressed with:
+ /// ```rust
+ /// let mut an_option = Some(0);
+ /// let taken = an_option.take();
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub MEM_REPLACE_OPTION_WITH_NONE,
+ style,
+ "replacing an `Option` with `None` instead of `take()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `mem::replace(&mut _, mem::uninitialized())`
+ /// and `mem::replace(&mut _, mem::zeroed())`.
+ ///
+ /// ### Why is this bad?
+ /// This will lead to undefined behavior even if the
+ /// value is overwritten later, because the uninitialized value may be
+ /// observed in the case of a panic.
+ ///
+ /// ### Example
+ /// ```
+ /// use std::mem;
+ ///# fn may_panic(v: Vec<i32>) -> Vec<i32> { v }
+ ///
+ /// #[allow(deprecated, invalid_value)]
+ /// fn myfunc (v: &mut Vec<i32>) {
+ /// let taken_v = unsafe { mem::replace(v, mem::uninitialized()) };
+ /// let new_v = may_panic(taken_v); // undefined behavior on panic
+ /// mem::forget(mem::replace(v, new_v));
+ /// }
+ /// ```
+ ///
+ /// The [take_mut](https://docs.rs/take_mut) crate offers a sound solution,
+ /// at the cost of either lazily creating a replacement value or aborting
+ /// on panic, to ensure that the uninitialized value cannot be observed.
+ #[clippy::version = "1.39.0"]
+ pub MEM_REPLACE_WITH_UNINIT,
+ correctness,
+ "`mem::replace(&mut _, mem::uninitialized())` or `mem::replace(&mut _, mem::zeroed())`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `std::mem::replace` on a value of type
+ /// `T` with `T::default()`.
+ ///
+ /// ### Why is this bad?
+ /// `std::mem` module already has the method `take` to
+ /// take the current value and replace it with the default value of that type.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut text = String::from("foo");
+ /// let replaced = std::mem::replace(&mut text, String::default());
+ /// ```
+ /// Is better expressed with:
+ /// ```rust
+ /// let mut text = String::from("foo");
+ /// let taken = std::mem::take(&mut text);
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub MEM_REPLACE_WITH_DEFAULT,
+ style,
+ "replacing a value of type `T` with `T::default()` instead of using `std::mem::take`"
+}
+
+impl_lint_pass!(MemReplace =>
+ [MEM_REPLACE_OPTION_WITH_NONE, MEM_REPLACE_WITH_UNINIT, MEM_REPLACE_WITH_DEFAULT]);
+
+fn check_replace_option_with_none(cx: &LateContext<'_>, src: &Expr<'_>, dest: &Expr<'_>, expr_span: Span) {
+ if let ExprKind::Path(ref replacement_qpath) = src.kind {
+ // Check that second argument is `Option::None`
+ if is_lang_ctor(cx, replacement_qpath, OptionNone) {
+ // Since this is a late pass (already type-checked),
+ // and we already know that the second argument is an
+ // `Option`, we do not need to check the first
+ // argument's type. All that's left is to get
+ // replacee's path.
+ let replaced_path = match dest.kind {
+ ExprKind::AddrOf(BorrowKind::Ref, Mutability::Mut, replaced) => {
+ if let ExprKind::Path(QPath::Resolved(None, replaced_path)) = replaced.kind {
+ replaced_path
+ } else {
+ return;
+ }
+ },
+ ExprKind::Path(QPath::Resolved(None, replaced_path)) => replaced_path,
+ _ => return,
+ };
+
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ MEM_REPLACE_OPTION_WITH_NONE,
+ expr_span,
+ "replacing an `Option` with `None`",
+ "consider `Option::take()` instead",
+ format!(
+ "{}.take()",
+ snippet_with_applicability(cx, replaced_path.span, "", &mut applicability)
+ ),
+ applicability,
+ );
+ }
+ }
+}
+
+fn check_replace_with_uninit(cx: &LateContext<'_>, src: &Expr<'_>, dest: &Expr<'_>, expr_span: Span) {
+ if_chain! {
+ // check if replacement is mem::MaybeUninit::uninit().assume_init()
+ if let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(src.hir_id);
+ if cx.tcx.is_diagnostic_item(sym::assume_init, method_def_id);
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ MEM_REPLACE_WITH_UNINIT,
+ expr_span,
+ "replacing with `mem::MaybeUninit::uninit().assume_init()`",
+ "consider using",
+ format!(
+ "std::ptr::read({})",
+ snippet_with_applicability(cx, dest.span, "", &mut applicability)
+ ),
+ applicability,
+ );
+ return;
+ }
+ }
+
+ if_chain! {
- if let ExprKind::Call(func, func_args) = expr.kind;
++ if let ExprKind::Call(repl_func, []) = src.kind;
+ if let 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();
+ then {
+ if cx.tcx.is_diagnostic_item(sym::mem_uninitialized, repl_def_id) {
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ MEM_REPLACE_WITH_UNINIT,
+ expr_span,
+ "replacing with `mem::uninitialized()`",
+ "consider using",
+ format!(
+ "std::ptr::read({})",
+ snippet_with_applicability(cx, dest.span, "", &mut applicability)
+ ),
+ applicability,
+ );
+ } else if cx.tcx.is_diagnostic_item(sym::mem_zeroed, repl_def_id) &&
+ !cx.typeck_results().expr_ty(src).is_primitive() {
+ span_lint_and_help(
+ cx,
+ MEM_REPLACE_WITH_UNINIT,
+ expr_span,
+ "replacing with `mem::zeroed()`",
+ None,
+ "consider using a default value or the `take_mut` crate instead",
+ );
+ }
+ }
+ }
+}
+
+fn check_replace_with_default(cx: &LateContext<'_>, src: &Expr<'_>, dest: &Expr<'_>, expr_span: Span) {
+ // disable lint for primitives
+ let expr_type = cx.typeck_results().expr_ty_adjusted(src);
+ if is_non_aggregate_primitive_type(expr_type) {
+ return;
+ }
+ // disable lint for Option since it is covered in another lint
+ if let ExprKind::Path(q) = &src.kind {
+ if is_lang_ctor(cx, q, OptionNone) {
+ return;
+ }
+ }
+ if is_default_equivalent(cx, src) && !in_external_macro(cx.tcx.sess, expr_span) {
+ span_lint_and_then(
+ cx,
+ MEM_REPLACE_WITH_DEFAULT,
+ expr_span,
+ "replacing a value of type `T` with `T::default()` is better expressed using `std::mem::take`",
+ |diag| {
+ if !expr_span.from_expansion() {
+ let suggestion = format!("std::mem::take({})", snippet(cx, dest.span, ""));
+
+ diag.span_suggestion(
+ expr_span,
+ "consider using",
+ suggestion,
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ );
+ }
+}
+
+pub struct MemReplace {
+ msrv: Option<RustcVersion>,
+}
+
+impl MemReplace {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for MemReplace {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ // Check that `expr` is a call to `mem::replace()`
- if let [dest, src] = func_args;
++ if let ExprKind::Call(func, [dest, src]) = expr.kind;
+ if let ExprKind::Path(ref func_qpath) = func.kind;
+ if let Some(def_id) = cx.qpath_res(func_qpath, func.hir_id).opt_def_id();
+ if cx.tcx.is_diagnostic_item(sym::mem_replace, def_id);
+ then {
+ check_replace_option_with_none(cx, src, dest, expr.span);
+ check_replace_with_uninit(cx, src, dest, expr.span);
+ if meets_msrv(self.msrv, msrvs::MEM_TAKE) {
+ check_replace_with_default(cx, src, dest, expr.span);
+ }
+ }
+ }
+ }
+ extract_msrv_attr!(LateContext);
+}
--- /dev/null
- use rustc_hir::{BindingAnnotation, Expr, ExprKind, MatchSource, Node, PatKind};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::get_parent_node;
+use clippy_utils::source::snippet_with_context;
+use clippy_utils::sugg;
+use clippy_utils::ty::is_copy;
+use rustc_errors::Applicability;
++use rustc_hir::{BindingAnnotation, Expr, ExprKind, MatchSource, Node, PatKind, QPath};
+use rustc_lint::LateContext;
+use rustc_middle::ty::{self, adjustment::Adjust};
+use rustc_span::symbol::{sym, Symbol};
+
+use super::CLONE_DOUBLE_REF;
+use super::CLONE_ON_COPY;
+
+/// Checks for the `CLONE_ON_COPY` lint.
+#[allow(clippy::too_many_lines)]
+pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, method_name: Symbol, args: &[Expr<'_>]) {
+ let arg = match args {
+ [arg] if method_name == sym::clone => arg,
+ _ => return,
+ };
+ if cx
+ .typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .and_then(|id| cx.tcx.trait_of_item(id))
+ .zip(cx.tcx.lang_items().clone_trait())
+ .map_or(true, |(x, y)| x != y)
+ {
+ return;
+ }
+ let arg_adjustments = cx.typeck_results().expr_adjustments(arg);
+ let arg_ty = arg_adjustments
+ .last()
+ .map_or_else(|| cx.typeck_results().expr_ty(arg), |a| a.target);
+
+ let ty = cx.typeck_results().expr_ty(expr);
+ if let ty::Ref(_, inner, _) = arg_ty.kind() {
+ if let ty::Ref(_, innermost, _) = inner.kind() {
+ span_lint_and_then(
+ cx,
+ CLONE_DOUBLE_REF,
+ expr.span,
+ &format!(
+ "using `clone` on a double-reference; \
+ this will copy the reference of type `{}` instead of cloning the inner type",
+ ty
+ ),
+ |diag| {
+ if let Some(snip) = sugg::Sugg::hir_opt(cx, arg) {
+ let mut ty = innermost;
+ let mut n = 0;
+ while let ty::Ref(_, inner, _) = ty.kind() {
+ ty = inner;
+ n += 1;
+ }
+ let refs = "&".repeat(n + 1);
+ let derefs = "*".repeat(n);
+ let explicit = format!("<{}{}>::clone({})", refs, ty, snip);
+ diag.span_suggestion(
+ expr.span,
+ "try dereferencing it",
+ format!("{}({}{}).clone()", refs, derefs, snip.deref()),
+ Applicability::MaybeIncorrect,
+ );
+ diag.span_suggestion(
+ expr.span,
+ "or try being explicit if you are sure, that you want to clone a reference",
+ explicit,
+ Applicability::MaybeIncorrect,
+ );
+ }
+ },
+ );
+ return; // don't report clone_on_copy
+ }
+ }
+
+ if is_copy(cx, ty) {
+ let parent_is_suffix_expr = match get_parent_node(cx.tcx, expr.hir_id) {
+ Some(Node::Expr(parent)) => match parent.kind {
+ // &*x is a nop, &x.clone() is not
+ ExprKind::AddrOf(..) => return,
+ // (*x).func() is useless, x.clone().func() can work in case func borrows self
+ ExprKind::MethodCall(_, [self_arg, ..], _)
+ if expr.hir_id == self_arg.hir_id && ty != cx.typeck_results().expr_ty_adjusted(expr) =>
+ {
+ return;
+ },
++ // ? is a Call, makes sure not to rec *x?, but rather (*x)?
++ ExprKind::Call(hir_callee, _) => matches!(
++ hir_callee.kind,
++ ExprKind::Path(QPath::LangItem(rustc_hir::LangItem::TryTraitBranch, _, _))
++ ),
+ ExprKind::MethodCall(_, [self_arg, ..], _) if expr.hir_id == self_arg.hir_id => true,
+ ExprKind::Match(_, _, MatchSource::TryDesugar | MatchSource::AwaitDesugar)
+ | ExprKind::Field(..)
+ | ExprKind::Index(..) => true,
+ _ => false,
+ },
+ // local binding capturing a reference
+ Some(Node::Local(l))
+ if matches!(
+ l.pat.kind,
+ PatKind::Binding(BindingAnnotation::Ref | BindingAnnotation::RefMut, ..)
+ ) =>
+ {
+ return;
+ },
+ _ => false,
+ };
+
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, arg.span, expr.span.ctxt(), "_", &mut app).0;
+
+ let deref_count = arg_adjustments
+ .iter()
+ .take_while(|adj| matches!(adj.kind, Adjust::Deref(_)))
+ .count();
+ let (help, sugg) = if deref_count == 0 {
+ ("try removing the `clone` call", snip.into())
+ } else if parent_is_suffix_expr {
+ ("try dereferencing it", format!("({}{})", "*".repeat(deref_count), snip))
+ } else {
+ ("try dereferencing it", format!("{}{}", "*".repeat(deref_count), snip))
+ };
+
+ span_lint_and_sugg(
+ cx,
+ CLONE_ON_COPY,
+ expr.span,
+ &format!("using `clone` on type `{}` which implements the `Copy` trait", ty),
+ help,
+ sugg,
+ app,
+ );
+ }
+}
--- /dev/null
- Some((EXPECT_USED, "an Option", "None"))
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::is_in_test_function;
+use clippy_utils::ty::is_type_diagnostic_item;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_span::sym;
+
+use super::EXPECT_USED;
+
+/// lint use of `expect()` for `Option`s and `Result`s
+pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, allow_expect_in_tests: bool) {
+ let obj_ty = cx.typeck_results().expr_ty(recv).peel_refs();
+
+ let mess = if is_type_diagnostic_item(cx, obj_ty, sym::Option) {
- Some((EXPECT_USED, "a Result", "Err"))
++ Some((EXPECT_USED, "an Option", "None", ""))
+ } else if is_type_diagnostic_item(cx, obj_ty, sym::Result) {
- if let Some((lint, kind, none_value)) = mess {
++ Some((EXPECT_USED, "a Result", "Err", "an "))
+ } else {
+ None
+ };
+
+ if allow_expect_in_tests && is_in_test_function(cx.tcx, expr.hir_id) {
+ return;
+ }
+
- &format!("used `expect()` on `{}` value", kind,),
++ if let Some((lint, kind, none_value, none_prefix)) = mess {
+ span_lint_and_help(
+ cx,
+ lint,
+ expr.span,
- &format!("if this value is an `{}`, it will panic", none_value,),
++ &format!("used `expect()` on `{kind}` value"),
+ None,
++ &format!("if this value is {none_prefix}`{none_value}`, it will panic"),
+ );
+ }
+}
--- /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");
+ /// ```
++ ///
++ /// If [expect_used](#expect_used) is enabled, instead:
++ /// ```rust,ignore
++ /// # let option = Some(1);
++ /// # let result: Result<usize, ()> = Ok(1);
++ /// option?;
++ ///
++ /// // or
++ ///
++ /// result?;
++ /// ```
+ #[clippy::version = "1.45.0"]
+ pub UNWRAP_USED,
+ restriction,
+ "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.expect()` 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
- use clippy_utils::is_in_test_function;
+use clippy_utils::diagnostics::span_lint_and_help;
- use super::UNWRAP_USED;
+use clippy_utils::ty::is_type_diagnostic_item;
++use clippy_utils::{is_in_test_function, is_lint_allowed};
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_span::sym;
+
- Some((UNWRAP_USED, "an Option", "None"))
++use super::{EXPECT_USED, UNWRAP_USED};
+
+/// lint use of `unwrap()` for `Option`s and `Result`s
+pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, allow_unwrap_in_tests: bool) {
+ let obj_ty = cx.typeck_results().expr_ty(recv).peel_refs();
+
+ let mess = if is_type_diagnostic_item(cx, obj_ty, sym::Option) {
- Some((UNWRAP_USED, "a Result", "Err"))
++ Some((UNWRAP_USED, "an Option", "None", ""))
+ } else if is_type_diagnostic_item(cx, obj_ty, sym::Result) {
- if let Some((lint, kind, none_value)) = mess {
++ Some((UNWRAP_USED, "a Result", "Err", "an "))
+ } else {
+ None
+ };
+
+ if allow_unwrap_in_tests && is_in_test_function(cx.tcx, expr.hir_id) {
+ return;
+ }
+
- &format!("used `unwrap()` on `{}` value", kind,),
++ if let Some((lint, kind, none_value, none_prefix)) = mess {
++ let help = if is_lint_allowed(cx, EXPECT_USED, expr.hir_id) {
++ format!(
++ "if you don't want to handle the `{none_value}` case gracefully, consider \
++ using `expect()` to provide a better panic message"
++ )
++ } else {
++ format!("if this value is {none_prefix}`{none_value}`, it will panic")
++ };
++
+ span_lint_and_help(
+ cx,
+ lint,
+ expr.span,
- &format!(
- "if you don't want to handle the `{}` case gracefully, consider \
- using `expect()` to provide a better panic message",
- none_value,
- ),
++ &format!("used `unwrap()` on `{kind}` value"),
+ None,
++ &help,
+ );
+ }
+}
--- /dev/null
- use clippy_utils::{fn_has_unsatisfiable_preds, is_entrypoint_fn, meets_msrv, msrvs, trait_ref_of_method};
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::qualify_min_const_fn::is_min_const_fn;
+use clippy_utils::ty::has_drop;
- cx: &LateContext<'_>,
- kind: FnKind<'_>,
++use clippy_utils::{
++ fn_has_unsatisfiable_preds, is_entrypoint_fn, is_from_proc_macro, meets_msrv, msrvs, trait_ref_of_method,
++};
+use rustc_hir as hir;
+use rustc_hir::def_id::CRATE_DEF_ID;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{Body, Constness, FnDecl, GenericParamKind, HirId};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::lint::in_external_macro;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::Span;
+use rustc_typeck::hir_ty_to_ty;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Suggests the use of `const` in functions and methods where possible.
+ ///
+ /// ### Why is this bad?
+ /// Not having the function const prevents callers of the function from being const as well.
+ ///
+ /// ### Known problems
+ /// Const functions are currently still being worked on, with some features only being available
+ /// on nightly. This lint does not consider all edge cases currently and the suggestions may be
+ /// incorrect if you are using this lint on stable.
+ ///
+ /// Also, the lint only runs one pass over the code. Consider these two non-const functions:
+ ///
+ /// ```rust
+ /// fn a() -> i32 {
+ /// 0
+ /// }
+ /// fn b() -> i32 {
+ /// a()
+ /// }
+ /// ```
+ ///
+ /// When running Clippy, the lint will only suggest to make `a` const, because `b` at this time
+ /// can't be const as it calls a non-const function. Making `a` const and running Clippy again,
+ /// will suggest to make `b` const, too.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct Foo {
+ /// # random_number: usize,
+ /// # }
+ /// # impl Foo {
+ /// fn new() -> Self {
+ /// Self { random_number: 42 }
+ /// }
+ /// # }
+ /// ```
+ ///
+ /// Could be a const fn:
+ ///
+ /// ```rust
+ /// # struct Foo {
+ /// # random_number: usize,
+ /// # }
+ /// # impl Foo {
+ /// const fn new() -> Self {
+ /// Self { random_number: 42 }
+ /// }
+ /// # }
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub MISSING_CONST_FOR_FN,
+ nursery,
+ "Lint functions definitions that could be made `const fn`"
+}
+
+impl_lint_pass!(MissingConstForFn => [MISSING_CONST_FOR_FN]);
+
+pub struct MissingConstForFn {
+ msrv: Option<RustcVersion>,
+}
+
+impl MissingConstForFn {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for MissingConstForFn {
+ fn check_fn(
+ &mut self,
- _: &Body<'_>,
++ cx: &LateContext<'tcx>,
++ kind: FnKind<'tcx>,
+ _: &FnDecl<'_>,
- || method_accepts_dropable(cx, sig.decl.inputs)
++ body: &Body<'tcx>,
+ span: Span,
+ hir_id: HirId,
+ ) {
+ if !meets_msrv(self.msrv, msrvs::CONST_IF_MATCH) {
+ return;
+ }
+
+ let def_id = cx.tcx.hir().local_def_id(hir_id);
+
+ if in_external_macro(cx.tcx.sess, span) || is_entrypoint_fn(cx, def_id.to_def_id()) {
+ return;
+ }
+
+ // Building MIR for `fn`s with unsatisfiable preds results in ICE.
+ if fn_has_unsatisfiable_preds(cx, def_id.to_def_id()) {
+ return;
+ }
+
+ // Perform some preliminary checks that rule out constness on the Clippy side. This way we
+ // can skip the actual const check and return early.
+ match kind {
+ FnKind::ItemFn(_, generics, header, ..) => {
+ let has_const_generic_params = generics
+ .params
+ .iter()
+ .any(|param| matches!(param.kind, GenericParamKind::Const { .. }));
+
+ if already_const(header) || has_const_generic_params {
+ return;
+ }
+ },
+ FnKind::Method(_, sig, ..) => {
+ if trait_ref_of_method(cx, def_id).is_some()
+ || already_const(sig.header)
- fn method_accepts_dropable(cx: &LateContext<'_>, param_tys: &[hir::Ty<'_>]) -> bool {
++ || method_accepts_droppable(cx, sig.decl.inputs)
+ {
+ return;
+ }
+ },
+ FnKind::Closure => return,
+ }
+
+ // Const fns are not allowed as methods in a trait.
+ {
+ let parent = cx.tcx.hir().get_parent_item(hir_id);
+ if parent != CRATE_DEF_ID {
+ if let hir::Node::Item(item) = cx.tcx.hir().get_by_def_id(parent) {
+ if let hir::ItemKind::Trait(..) = &item.kind {
+ return;
+ }
+ }
+ }
+ }
+
++ if is_from_proc_macro(cx, &(&kind, body, hir_id, span)) {
++ return;
++ }
++
+ let mir = cx.tcx.optimized_mir(def_id);
+
+ if let Err((span, err)) = is_min_const_fn(cx.tcx, mir, self.msrv) {
+ if cx.tcx.is_const_fn_raw(def_id.to_def_id()) {
+ cx.tcx.sess.span_err(span, err.as_ref());
+ }
+ } else {
+ span_lint(cx, MISSING_CONST_FOR_FN, span, "this could be a `const fn`");
+ }
+ }
+ extract_msrv_attr!(LateContext);
+}
+
+/// Returns true if any of the method parameters is a type that implements `Drop`. The method
+/// can't be made const then, because `drop` can't be const-evaluated.
++fn method_accepts_droppable(cx: &LateContext<'_>, param_tys: &[hir::Ty<'_>]) -> bool {
+ // If any of the params are droppable, return true
+ param_tys.iter().any(|hir_ty| {
+ let ty_ty = hir_ty_to_ty(cx.tcx, hir_ty);
+ has_drop(cx, ty_ty)
+ })
+}
+
+// We don't have to lint on something that's already `const`
+#[must_use]
+fn already_const(header: hir::FnHeader) -> bool {
+ header.constness == Constness::Const
+}
--- /dev/null
- use rustc_ast::ast;
+// Note: More specifically this lint is largely inspired (aka copied) from
+// *rustc*'s
+// [`missing_doc`].
+//
+// [`missing_doc`]: https://github.com/rust-lang/rust/blob/cf9cf7c923eb01146971429044f216a3ca905e06/compiler/rustc_lint/src/builtin.rs#L415
+//
+
+use clippy_utils::attrs::is_doc_hidden;
+use clippy_utils::diagnostics::span_lint;
- let has_doc = attrs.iter().any(|a| a.doc_str().is_some());
++use clippy_utils::is_from_proc_macro;
++use rustc_ast::ast::{self, MetaItem, MetaItemKind};
+use rustc_hir as hir;
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::ty::DefIdTree;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::def_id::CRATE_DEF_ID;
+use rustc_span::source_map::Span;
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns if there is missing doc for any documentable item
+ /// (public or private).
+ ///
+ /// ### Why is this bad?
+ /// Doc is good. *rustc* has a `MISSING_DOCS`
+ /// allowed-by-default lint for
+ /// public members, but has no way to enforce documentation of private items.
+ /// This lint fixes that.
+ #[clippy::version = "pre 1.29.0"]
+ pub MISSING_DOCS_IN_PRIVATE_ITEMS,
+ restriction,
+ "detects missing documentation for public and private members"
+}
+
+pub struct MissingDoc {
+ /// Stack of whether #[doc(hidden)] is set
+ /// at each level which has lint attributes.
+ doc_hidden_stack: Vec<bool>,
+}
+
+impl Default for MissingDoc {
+ #[must_use]
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl MissingDoc {
+ #[must_use]
+ pub fn new() -> Self {
+ Self {
+ doc_hidden_stack: vec![false],
+ }
+ }
+
+ fn doc_hidden(&self) -> bool {
+ *self.doc_hidden_stack.last().expect("empty doc_hidden_stack")
+ }
+
++ fn has_include(meta: Option<MetaItem>) -> bool {
++ if_chain! {
++ if let Some(meta) = meta;
++ if let MetaItemKind::List(list) = meta.kind;
++ if let Some(meta) = list.get(0);
++ if let Some(name) = meta.ident();
++ then {
++ name.name == sym::include
++ } else {
++ false
++ }
++ }
++ }
++
+ fn check_missing_docs_attrs(
+ &self,
+ cx: &LateContext<'_>,
+ attrs: &[ast::Attribute],
+ sp: Span,
+ article: &'static str,
+ desc: &'static str,
+ ) {
+ // If we're building a test harness, then warning about
+ // documentation is probably not really relevant right now.
+ if cx.sess().opts.test {
+ return;
+ }
+
+ // `#[doc(hidden)]` disables missing_docs check.
+ if self.doc_hidden() {
+ return;
+ }
+
+ if sp.from_expansion() {
+ return;
+ }
+
- self.check_missing_docs_attrs(cx, attrs, it.span, article, desc);
++ let has_doc = attrs
++ .iter()
++ .any(|a| a.doc_str().is_some() || Self::has_include(a.meta()));
+ if !has_doc {
+ span_lint(
+ cx,
+ MISSING_DOCS_IN_PRIVATE_ITEMS,
+ sp,
+ &format!("missing documentation for {} {}", article, desc),
+ );
+ }
+ }
+}
+
+impl_lint_pass!(MissingDoc => [MISSING_DOCS_IN_PRIVATE_ITEMS]);
+
+impl<'tcx> LateLintPass<'tcx> for MissingDoc {
+ fn enter_lint_attrs(&mut self, _: &LateContext<'tcx>, attrs: &'tcx [ast::Attribute]) {
+ let doc_hidden = self.doc_hidden() || is_doc_hidden(attrs);
+ self.doc_hidden_stack.push(doc_hidden);
+ }
+
+ fn exit_lint_attrs(&mut self, _: &LateContext<'tcx>, _: &'tcx [ast::Attribute]) {
+ self.doc_hidden_stack.pop().expect("empty doc_hidden_stack");
+ }
+
+ fn check_crate(&mut self, cx: &LateContext<'tcx>) {
+ let attrs = cx.tcx.hir().attrs(hir::CRATE_HIR_ID);
+ self.check_missing_docs_attrs(cx, attrs, cx.tcx.def_span(CRATE_DEF_ID), "the", "crate");
+ }
+
+ fn check_item(&mut self, cx: &LateContext<'tcx>, it: &'tcx hir::Item<'_>) {
+ match it.kind {
+ hir::ItemKind::Fn(..) => {
+ // ignore main()
+ if it.ident.name == sym::main {
+ let at_root = cx.tcx.local_parent(it.def_id) == CRATE_DEF_ID;
+ if at_root {
+ return;
+ }
+ }
+ },
+ hir::ItemKind::Const(..)
+ | hir::ItemKind::Enum(..)
+ | hir::ItemKind::Macro(..)
+ | hir::ItemKind::Mod(..)
+ | hir::ItemKind::Static(..)
+ | hir::ItemKind::Struct(..)
+ | hir::ItemKind::Trait(..)
+ | hir::ItemKind::TraitAlias(..)
+ | hir::ItemKind::TyAlias(..)
+ | hir::ItemKind::Union(..)
+ | hir::ItemKind::OpaqueTy(..) => {},
+ hir::ItemKind::ExternCrate(..)
+ | hir::ItemKind::ForeignMod { .. }
+ | hir::ItemKind::GlobalAsm(..)
+ | hir::ItemKind::Impl { .. }
+ | hir::ItemKind::Use(..) => return,
+ };
+
+ let (article, desc) = cx.tcx.article_and_description(it.def_id.to_def_id());
+
+ let attrs = cx.tcx.hir().attrs(it.hir_id());
- self.check_missing_docs_attrs(cx, attrs, trait_item.span, article, desc);
++ if !is_from_proc_macro(cx, it) {
++ self.check_missing_docs_attrs(cx, attrs, it.span, article, desc);
++ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, trait_item: &'tcx hir::TraitItem<'_>) {
+ let (article, desc) = cx.tcx.article_and_description(trait_item.def_id.to_def_id());
+
+ let attrs = cx.tcx.hir().attrs(trait_item.hir_id());
- self.check_missing_docs_attrs(cx, attrs, impl_item.span, article, desc);
++ if !is_from_proc_macro(cx, trait_item) {
++ self.check_missing_docs_attrs(cx, attrs, trait_item.span, article, desc);
++ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
+ // If the method is an impl for a trait, don't doc.
+ if let Some(cid) = cx.tcx.associated_item(impl_item.def_id).impl_container(cx.tcx) {
+ if cx.tcx.impl_trait_ref(cid).is_some() {
+ return;
+ }
+ } else {
+ return;
+ }
+
+ let (article, desc) = cx.tcx.article_and_description(impl_item.def_id.to_def_id());
+ let attrs = cx.tcx.hir().attrs(impl_item.hir_id());
- self.check_missing_docs_attrs(cx, attrs, sf.span, "a", "struct field");
++ if !is_from_proc_macro(cx, impl_item) {
++ self.check_missing_docs_attrs(cx, attrs, impl_item.span, article, desc);
++ }
+ }
+
+ fn check_field_def(&mut self, cx: &LateContext<'tcx>, sf: &'tcx hir::FieldDef<'_>) {
+ if !sf.is_positional() {
+ let attrs = cx.tcx.hir().attrs(sf.hir_id);
- self.check_missing_docs_attrs(cx, attrs, v.span, "a", "variant");
++ if !is_from_proc_macro(cx, sf) {
++ self.check_missing_docs_attrs(cx, attrs, sf.span, "a", "struct field");
++ }
+ }
+ }
+
+ fn check_variant(&mut self, cx: &LateContext<'tcx>, v: &'tcx hir::Variant<'_>) {
+ let attrs = cx.tcx.hir().attrs(v.id);
++ if !is_from_proc_macro(cx, v) {
++ self.check_missing_docs_attrs(cx, attrs, v.span, "a", "variant");
++ }
+ }
+}
--- /dev/null
--- /dev/null
++use clippy_utils::{
++ diagnostics::span_lint_and_sugg, is_lang_ctor, peel_hir_expr_refs, peel_ref_operators, sugg,
++ ty::is_type_diagnostic_item,
++};
++use rustc_errors::Applicability;
++use rustc_hir::{BinOpKind, Expr, ExprKind, LangItem};
++use rustc_lint::{LateContext, LateLintPass};
++use rustc_session::{declare_lint_pass, declare_tool_lint};
++use rustc_span::sym;
++
++declare_clippy_lint! {
++ /// ### What it does
++ ///
++ /// Checks for binary comparisons to a literal `Option::None`.
++ ///
++ /// ### Why is this bad?
++ ///
++ /// A programmer checking if some `foo` is `None` via a comparison `foo == None`
++ /// is usually inspired from other programming languages (e.g. `foo is None`
++ /// in Python).
++ /// Checking if a value of type `Option<T>` is (not) equal to `None` in that
++ /// way relies on `T: PartialEq` to do the comparison, which is unneeded.
++ ///
++ /// ### Example
++ /// ```rust
++ /// fn foo(f: Option<u32>) -> &'static str {
++ /// if f != None { "yay" } else { "nay" }
++ /// }
++ /// ```
++ /// Use instead:
++ /// ```rust
++ /// fn foo(f: Option<u32>) -> &'static str {
++ /// if f.is_some() { "yay" } else { "nay" }
++ /// }
++ /// ```
++ #[clippy::version = "1.64.0"]
++ pub PARTIALEQ_TO_NONE,
++ style,
++ "Binary comparison to `Option<T>::None` relies on `T: PartialEq`, which is unneeded"
++}
++declare_lint_pass!(PartialeqToNone => [PARTIALEQ_TO_NONE]);
++
++impl<'tcx> LateLintPass<'tcx> for PartialeqToNone {
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
++ // Skip expanded code, as we have no control over it anyway...
++ if e.span.from_expansion() {
++ return;
++ }
++
++ // If the expression is of type `Option`
++ let is_ty_option =
++ |expr: &Expr<'_>| is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(expr).peel_refs(), sym::Option);
++
++ // If the expression is a literal `Option::None`
++ let is_none_ctor = |expr: &Expr<'_>| {
++ matches!(&peel_hir_expr_refs(expr).0.kind,
++ ExprKind::Path(p) if is_lang_ctor(cx, p, LangItem::OptionNone))
++ };
++
++ let mut applicability = Applicability::MachineApplicable;
++
++ if let ExprKind::Binary(op, left_side, right_side) = e.kind {
++ // All other comparisons (e.g. `>= None`) have special meaning wrt T
++ let is_eq = match op.node {
++ BinOpKind::Eq => true,
++ BinOpKind::Ne => false,
++ _ => return,
++ };
++
++ // We are only interested in comparisons between `Option` and a literal `Option::None`
++ let scrutinee = match (
++ is_none_ctor(left_side) && is_ty_option(right_side),
++ is_none_ctor(right_side) && is_ty_option(left_side),
++ ) {
++ (true, false) => right_side,
++ (false, true) => left_side,
++ _ => return,
++ };
++
++ // Peel away refs/derefs (as long as we don't cross manual deref impls), as
++ // autoref/autoderef will take care of those
++ let sugg = format!(
++ "{}.{}",
++ sugg::Sugg::hir_with_applicability(cx, peel_ref_operators(cx, scrutinee), "..", &mut applicability)
++ .maybe_par(),
++ if is_eq { "is_none()" } else { "is_some()" }
++ );
++
++ span_lint_and_sugg(
++ cx,
++ PARTIALEQ_TO_NONE,
++ e.span,
++ "binary comparison to literal `Option::None`",
++ if is_eq {
++ "use `Option::is_none()` instead"
++ } else {
++ "use `Option::is_some()` instead"
++ },
++ sugg,
++ applicability,
++ );
++ }
++ }
++}
--- /dev/null
- if let ExprKind::MethodCall(path, args, _) = expr.kind;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::ty::is_type_diagnostic_item;
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+use std::path::{Component, Path};
+
+declare_clippy_lint! {
+ /// ### What it does
+ ///* Checks for [push](https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.push)
+ /// calls on `PathBuf` that can cause overwrites.
+ ///
+ /// ### Why is this bad?
+ /// Calling `push` with a root path at the start can overwrite the
+ /// previous defined path.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::path::PathBuf;
+ ///
+ /// let mut x = PathBuf::from("/foo");
+ /// x.push("/bar");
+ /// assert_eq!(x, PathBuf::from("/bar"));
+ /// ```
+ /// Could be written:
+ ///
+ /// ```rust
+ /// use std::path::PathBuf;
+ ///
+ /// let mut x = PathBuf::from("/foo");
+ /// x.push("bar");
+ /// assert_eq!(x, PathBuf::from("/foo/bar"));
+ /// ```
+ #[clippy::version = "1.36.0"]
+ pub PATH_BUF_PUSH_OVERWRITE,
+ nursery,
+ "calling `push` with file system root on `PathBuf` can overwrite it"
+}
+
+declare_lint_pass!(PathBufPushOverwrite => [PATH_BUF_PUSH_OVERWRITE]);
+
+impl<'tcx> LateLintPass<'tcx> for PathBufPushOverwrite {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
- if args.len() == 2;
- if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(&args[0]).peel_refs(), sym::PathBuf);
- if let Some(get_index_arg) = args.get(1);
++ if let ExprKind::MethodCall(path, [recv, get_index_arg], _) = expr.kind;
+ if path.ident.name == sym!(push);
++ if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(recv).peel_refs(), sym::PathBuf);
+ if let ExprKind::Lit(ref lit) = get_index_arg.kind;
+ if let LitKind::Str(ref path_lit, _) = lit.node;
+ if let pushed_path = Path::new(path_lit.as_str());
+ if let Some(pushed_path_lit) = pushed_path.to_str();
+ if pushed_path.has_root();
+ if let Some(root) = pushed_path.components().next();
+ if root == Component::RootDir;
+ then {
+ span_lint_and_sugg(
+ cx,
+ PATH_BUF_PUSH_OVERWRITE,
+ lit.span,
+ "calling `push` with '/' or '\\' (file system root) will overwrite the previous path definition",
+ "try",
+ format!("\"{}\"", pushed_path_lit.trim_start_matches(|c| c == '/' || c == '\\')),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
--- /dev/null
- if let ExprKind::MethodCall(segment, args, _) = &cond.kind;
- if let Some(caller) = args.get(0);
+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, [caller, ..], _) = &cond.kind;
+ 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
- if let ExprKind::MethodCall(iter_path, iter_args, _) = iter.kind;
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::{snippet, snippet_opt, snippet_with_applicability};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::{get_parent_expr, in_constant, is_integer_const, meets_msrv, msrvs, path_to_local};
+use clippy_utils::{higher, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast::RangeLimits;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, HirId, PathSegment, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::{Span, Spanned};
+use rustc_span::sym;
+use std::cmp::Ordering;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for zipping a collection with the range of
+ /// `0.._.len()`.
+ ///
+ /// ### Why is this bad?
+ /// The code is better expressed with `.enumerate()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = vec![1];
+ /// let _ = x.iter().zip(0..x.len());
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = vec![1];
+ /// let _ = x.iter().enumerate();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_ZIP_WITH_LEN,
+ complexity,
+ "zipping iterator with a range when `enumerate()` would do"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for exclusive ranges where 1 is added to the
+ /// upper bound, e.g., `x..(y+1)`.
+ ///
+ /// ### Why is this bad?
+ /// The code is more readable with an inclusive range
+ /// like `x..=y`.
+ ///
+ /// ### Known problems
+ /// Will add unnecessary pair of parentheses when the
+ /// expression is not wrapped in a pair but starts with an opening parenthesis
+ /// and ends with a closing one.
+ /// I.e., `let _ = (f()+1)..(f()+1)` results in `let _ = ((f()+1)..=f())`.
+ ///
+ /// Also in many cases, inclusive ranges are still slower to run than
+ /// exclusive ranges, because they essentially add an extra branch that
+ /// LLVM may fail to hoist out of the loop.
+ ///
+ /// This will cause a warning that cannot be fixed if the consumer of the
+ /// range only accepts a specific range type, instead of the generic
+ /// `RangeBounds` trait
+ /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..(y+1) {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..=y {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_PLUS_ONE,
+ pedantic,
+ "`x..(y+1)` reads better as `x..=y`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for inclusive ranges where 1 is subtracted from
+ /// the upper bound, e.g., `x..=(y-1)`.
+ ///
+ /// ### Why is this bad?
+ /// The code is more readable with an exclusive range
+ /// like `x..y`.
+ ///
+ /// ### Known problems
+ /// This will cause a warning that cannot be fixed if
+ /// the consumer of the range only accepts a specific range type, instead of
+ /// the generic `RangeBounds` trait
+ /// ([#3307](https://github.com/rust-lang/rust-clippy/issues/3307)).
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..=(y-1) {
+ /// // ..
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let x = 0;
+ /// # let y = 1;
+ /// for i in x..y {
+ /// // ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub RANGE_MINUS_ONE,
+ pedantic,
+ "`x..=(y-1)` reads better as `x..y`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for range expressions `x..y` where both `x` and `y`
+ /// are constant and `x` is greater or equal to `y`.
+ ///
+ /// ### Why is this bad?
+ /// Empty ranges yield no values so iterating them is a no-op.
+ /// Moreover, trying to use a reversed range to index a slice will panic at run-time.
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// fn main() {
+ /// (10..=0).for_each(|x| println!("{}", x));
+ ///
+ /// let arr = [1, 2, 3, 4, 5];
+ /// let sub = &arr[3..1];
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// (0..=10).rev().for_each(|x| println!("{}", x));
+ ///
+ /// let arr = [1, 2, 3, 4, 5];
+ /// let sub = &arr[1..3];
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub REVERSED_EMPTY_RANGES,
+ correctness,
+ "reversing the limits of range expressions, resulting in empty ranges"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for expressions like `x >= 3 && x < 8` that could
+ /// be more readably expressed as `(3..8).contains(x)`.
+ ///
+ /// ### Why is this bad?
+ /// `contains` expresses the intent better and has less
+ /// failure modes (such as fencepost errors or using `||` instead of `&&`).
+ ///
+ /// ### Example
+ /// ```rust
+ /// // given
+ /// let x = 6;
+ ///
+ /// assert!(x >= 3 && x < 8);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ ///# let x = 6;
+ /// assert!((3..8).contains(&x));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MANUAL_RANGE_CONTAINS,
+ style,
+ "manually reimplementing {`Range`, `RangeInclusive`}`::contains`"
+}
+
+pub struct Ranges {
+ msrv: Option<RustcVersion>,
+}
+
+impl Ranges {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(Ranges => [
+ RANGE_ZIP_WITH_LEN,
+ RANGE_PLUS_ONE,
+ RANGE_MINUS_ONE,
+ REVERSED_EMPTY_RANGES,
+ MANUAL_RANGE_CONTAINS,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Ranges {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ match expr.kind {
+ ExprKind::MethodCall(path, args, _) => {
+ check_range_zip_with_len(cx, path, args, expr.span);
+ },
+ ExprKind::Binary(ref op, l, r) => {
+ if meets_msrv(self.msrv, msrvs::RANGE_CONTAINS) {
+ check_possible_range_contains(cx, op.node, l, r, expr, expr.span);
+ }
+ },
+ _ => {},
+ }
+
+ check_exclusive_range_plus_one(cx, expr);
+ check_inclusive_range_minus_one(cx, expr);
+ check_reversed_empty_range(cx, expr);
+ }
+ extract_msrv_attr!(LateContext);
+}
+
+fn check_possible_range_contains(
+ cx: &LateContext<'_>,
+ op: BinOpKind,
+ left: &Expr<'_>,
+ right: &Expr<'_>,
+ expr: &Expr<'_>,
+ span: Span,
+) {
+ if in_constant(cx, expr.hir_id) {
+ return;
+ }
+
+ let combine_and = match op {
+ BinOpKind::And | BinOpKind::BitAnd => true,
+ BinOpKind::Or | BinOpKind::BitOr => false,
+ _ => return,
+ };
+ // value, name, order (higher/lower), inclusiveness
+ if let (Some(l), Some(r)) = (check_range_bounds(cx, left), check_range_bounds(cx, right)) {
+ // we only lint comparisons on the same name and with different
+ // direction
+ if l.id != r.id || l.ord == r.ord {
+ return;
+ }
+ let ord = Constant::partial_cmp(cx.tcx, cx.typeck_results().expr_ty(l.expr), &l.val, &r.val);
+ if combine_and && ord == Some(r.ord) {
+ // order lower bound and upper bound
+ let (l_span, u_span, l_inc, u_inc) = if r.ord == Ordering::Less {
+ (l.val_span, r.val_span, l.inc, r.inc)
+ } else {
+ (r.val_span, l.val_span, r.inc, l.inc)
+ };
+ // we only lint inclusive lower bounds
+ if !l_inc {
+ return;
+ }
+ let (range_type, range_op) = if u_inc {
+ ("RangeInclusive", "..=")
+ } else {
+ ("Range", "..")
+ };
+ let mut applicability = Applicability::MachineApplicable;
+ let name = snippet_with_applicability(cx, l.name_span, "_", &mut applicability);
+ let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
+ let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+ let space = if lo.ends_with('.') { " " } else { "" };
+ span_lint_and_sugg(
+ cx,
+ MANUAL_RANGE_CONTAINS,
+ span,
+ &format!("manual `{}::contains` implementation", range_type),
+ "use",
+ format!("({}{}{}{}).contains(&{})", lo, space, range_op, hi, name),
+ applicability,
+ );
+ } else if !combine_and && ord == Some(l.ord) {
+ // `!_.contains(_)`
+ // order lower bound and upper bound
+ let (l_span, u_span, l_inc, u_inc) = if l.ord == Ordering::Less {
+ (l.val_span, r.val_span, l.inc, r.inc)
+ } else {
+ (r.val_span, l.val_span, r.inc, l.inc)
+ };
+ if l_inc {
+ return;
+ }
+ let (range_type, range_op) = if u_inc {
+ ("Range", "..")
+ } else {
+ ("RangeInclusive", "..=")
+ };
+ let mut applicability = Applicability::MachineApplicable;
+ let name = snippet_with_applicability(cx, l.name_span, "_", &mut applicability);
+ let lo = snippet_with_applicability(cx, l_span, "_", &mut applicability);
+ let hi = snippet_with_applicability(cx, u_span, "_", &mut applicability);
+ let space = if lo.ends_with('.') { " " } else { "" };
+ span_lint_and_sugg(
+ cx,
+ MANUAL_RANGE_CONTAINS,
+ span,
+ &format!("manual `!{}::contains` implementation", range_type),
+ "use",
+ format!("!({}{}{}{}).contains(&{})", lo, space, range_op, hi, name),
+ applicability,
+ );
+ }
+ }
+
+ // If the LHS is the same operator, we have to recurse to get the "real" RHS, since they have
+ // the same operator precedence
+ if_chain! {
+ if let ExprKind::Binary(ref lhs_op, _left, new_lhs) = left.kind;
+ if op == lhs_op.node;
+ let new_span = Span::new(new_lhs.span.lo(), right.span.hi(), expr.span.ctxt(), expr.span.parent());
+ if let Some(snip) = &snippet_opt(cx, new_span);
+ // Do not continue if we have mismatched number of parens, otherwise the suggestion is wrong
+ if snip.matches('(').count() == snip.matches(')').count();
+ then {
+ check_possible_range_contains(cx, op, new_lhs, right, expr, new_span);
+ }
+ }
+}
+
+struct RangeBounds<'a> {
+ val: Constant,
+ expr: &'a Expr<'a>,
+ id: HirId,
+ name_span: Span,
+ val_span: Span,
+ ord: Ordering,
+ inc: bool,
+}
+
+// Takes a binary expression such as x <= 2 as input
+// Breaks apart into various pieces, such as the value of the number,
+// hir id of the variable, and direction/inclusiveness of the operator
+fn check_range_bounds<'a>(cx: &'a LateContext<'_>, ex: &'a Expr<'_>) -> Option<RangeBounds<'a>> {
+ if let ExprKind::Binary(ref op, l, r) = ex.kind {
+ let (inclusive, ordering) = match op.node {
+ BinOpKind::Gt => (false, Ordering::Greater),
+ BinOpKind::Ge => (true, Ordering::Greater),
+ BinOpKind::Lt => (false, Ordering::Less),
+ BinOpKind::Le => (true, Ordering::Less),
+ _ => return None,
+ };
+ if let Some(id) = path_to_local(l) {
+ if let Some((c, _)) = constant(cx, cx.typeck_results(), r) {
+ return Some(RangeBounds {
+ val: c,
+ expr: r,
+ id,
+ name_span: l.span,
+ val_span: r.span,
+ ord: ordering,
+ inc: inclusive,
+ });
+ }
+ } else if let Some(id) = path_to_local(r) {
+ if let Some((c, _)) = constant(cx, cx.typeck_results(), l) {
+ return Some(RangeBounds {
+ val: c,
+ expr: l,
+ id,
+ name_span: r.span,
+ val_span: l.span,
+ ord: ordering.reverse(),
+ inc: inclusive,
+ });
+ }
+ }
+ }
+ None
+}
+
+fn check_range_zip_with_len(cx: &LateContext<'_>, path: &PathSegment<'_>, args: &[Expr<'_>], span: Span) {
+ if_chain! {
+ if path.ident.as_str() == "zip";
+ if let [iter, zip_arg] = args;
+ // `.iter()` call
- if let ExprKind::MethodCall(len_path, len_args, _) = end.kind;
- if len_path.ident.name == sym::len && len_args.len() == 1;
++ if let ExprKind::MethodCall(iter_path, [iter_caller, ..], _) = iter.kind;
+ if iter_path.ident.name == sym::iter;
+ // range expression in `.zip()` call: `0..x.len()`
+ if let Some(higher::Range { start: Some(start), end: Some(end), .. }) = higher::Range::hir(zip_arg);
+ if is_integer_const(cx, start, 0);
+ // `.len()` call
- if let ExprKind::Path(QPath::Resolved(_, iter_path)) = iter_args[0].kind;
- if let ExprKind::Path(QPath::Resolved(_, len_path)) = len_args[0].kind;
- if SpanlessEq::new(cx).eq_path_segments(&iter_path.segments, &len_path.segments);
++ if let ExprKind::MethodCall(len_path, [len_caller], _) = end.kind;
++ if len_path.ident.name == sym::len;
+ // `.iter()` and `.len()` called on same `Path`
- snippet(cx, iter_args[0].span, "_"))
++ if let ExprKind::Path(QPath::Resolved(_, iter_path)) = iter_caller.kind;
++ if let ExprKind::Path(QPath::Resolved(_, len_path)) = len_caller.kind;
++ if SpanlessEq::new(cx).eq_path_segments(iter_path.segments, len_path.segments);
+ then {
+ span_lint(cx,
+ RANGE_ZIP_WITH_LEN,
+ span,
+ &format!("it is more idiomatic to use `{}.iter().enumerate()`",
++ snippet(cx, iter_caller.span, "_"))
+ );
+ }
+ }
+}
+
+// exclusive range plus one: `x..(y+1)`
+fn check_exclusive_range_plus_one(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ if let Some(higher::Range {
+ start,
+ end: Some(end),
+ limits: RangeLimits::HalfOpen
+ }) = higher::Range::hir(expr);
+ if let Some(y) = y_plus_one(cx, end);
+ then {
+ let span = if expr.span.from_expansion() {
+ expr.span
+ .ctxt()
+ .outer_expn_data()
+ .call_site
+ } else {
+ expr.span
+ };
+ span_lint_and_then(
+ cx,
+ RANGE_PLUS_ONE,
+ span,
+ "an inclusive range would be more readable",
+ |diag| {
+ let start = start.map_or(String::new(), |x| Sugg::hir(cx, x, "x").maybe_par().to_string());
+ let end = Sugg::hir(cx, y, "y").maybe_par();
+ if let Some(is_wrapped) = &snippet_opt(cx, span) {
+ if is_wrapped.starts_with('(') && is_wrapped.ends_with(')') {
+ diag.span_suggestion(
+ span,
+ "use",
+ format!("({}..={})", start, end),
+ Applicability::MaybeIncorrect,
+ );
+ } else {
+ diag.span_suggestion(
+ span,
+ "use",
+ format!("{}..={}", start, end),
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ },
+ );
+ }
+ }
+}
+
+// inclusive range minus one: `x..=(y-1)`
+fn check_inclusive_range_minus_one(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ if let Some(higher::Range { start, end: Some(end), limits: RangeLimits::Closed }) = higher::Range::hir(expr);
+ if let Some(y) = y_minus_one(cx, end);
+ then {
+ span_lint_and_then(
+ cx,
+ RANGE_MINUS_ONE,
+ expr.span,
+ "an exclusive range would be more readable",
+ |diag| {
+ let start = start.map_or(String::new(), |x| Sugg::hir(cx, x, "x").maybe_par().to_string());
+ let end = Sugg::hir(cx, y, "y").maybe_par();
+ diag.span_suggestion(
+ expr.span,
+ "use",
+ format!("{}..{}", start, end),
+ Applicability::MachineApplicable, // snippet
+ );
+ },
+ );
+ }
+ }
+}
+
+fn check_reversed_empty_range(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ fn inside_indexing_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ matches!(
+ get_parent_expr(cx, expr),
+ Some(Expr {
+ kind: ExprKind::Index(..),
+ ..
+ })
+ )
+ }
+
+ fn is_for_loop_arg(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ let mut cur_expr = expr;
+ while let Some(parent_expr) = get_parent_expr(cx, cur_expr) {
+ match higher::ForLoop::hir(parent_expr) {
+ Some(higher::ForLoop { arg, .. }) if arg.hir_id == expr.hir_id => return true,
+ _ => cur_expr = parent_expr,
+ }
+ }
+
+ false
+ }
+
+ fn is_empty_range(limits: RangeLimits, ordering: Ordering) -> bool {
+ match limits {
+ RangeLimits::HalfOpen => ordering != Ordering::Less,
+ RangeLimits::Closed => ordering == Ordering::Greater,
+ }
+ }
+
+ if_chain! {
+ if let Some(higher::Range { start: Some(start), end: Some(end), limits }) = higher::Range::hir(expr);
+ let ty = cx.typeck_results().expr_ty(start);
+ if let ty::Int(_) | ty::Uint(_) = ty.kind();
+ if let Some((start_idx, _)) = constant(cx, cx.typeck_results(), start);
+ if let Some((end_idx, _)) = constant(cx, cx.typeck_results(), end);
+ if let Some(ordering) = Constant::partial_cmp(cx.tcx, ty, &start_idx, &end_idx);
+ if is_empty_range(limits, ordering);
+ then {
+ if inside_indexing_expr(cx, expr) {
+ // Avoid linting `N..N` as it has proven to be useful, see #5689 and #5628 ...
+ if ordering != Ordering::Equal {
+ span_lint(
+ cx,
+ REVERSED_EMPTY_RANGES,
+ expr.span,
+ "this range is reversed and using it to index a slice will panic at run-time",
+ );
+ }
+ // ... except in for loop arguments for backwards compatibility with `reverse_range_loop`
+ } else if ordering != Ordering::Equal || is_for_loop_arg(cx, expr) {
+ span_lint_and_then(
+ cx,
+ REVERSED_EMPTY_RANGES,
+ expr.span,
+ "this range is empty so it will yield no values",
+ |diag| {
+ if ordering != Ordering::Equal {
+ let start_snippet = snippet(cx, start.span, "_");
+ let end_snippet = snippet(cx, end.span, "_");
+ let dots = match limits {
+ RangeLimits::HalfOpen => "..",
+ RangeLimits::Closed => "..="
+ };
+
+ diag.span_suggestion(
+ expr.span,
+ "consider using the following if you are attempting to iterate over this \
+ range in reverse",
+ format!("({}{}{}).rev()", end_snippet, dots, start_snippet),
+ Applicability::MaybeIncorrect,
+ );
+ }
+ },
+ );
+ }
+ }
+ }
+}
+
+fn y_plus_one<'t>(cx: &LateContext<'_>, expr: &'t Expr<'_>) -> Option<&'t Expr<'t>> {
+ match expr.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Add, ..
+ },
+ lhs,
+ rhs,
+ ) => {
+ if is_integer_const(cx, lhs, 1) {
+ Some(rhs)
+ } else if is_integer_const(cx, rhs, 1) {
+ Some(lhs)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+fn y_minus_one<'t>(cx: &LateContext<'_>, expr: &'t Expr<'_>) -> Option<&'t Expr<'t>> {
+ match expr.kind {
+ ExprKind::Binary(
+ Spanned {
+ node: BinOpKind::Sub, ..
+ },
+ lhs,
+ rhs,
+ ) if is_integer_const(cx, rhs, 1) => Some(lhs),
+ _ => None,
+ }
+}
--- /dev/null
- use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
- if let ast::ExprKind::Closure(_, _, _, _, ref decl, ref block, _) = closure.kind;
++use clippy_utils::sugg::Sugg;
+use if_chain::if_chain;
+use rustc_ast::ast;
+use rustc_ast::visit as ast_visit;
+use rustc_ast::visit::Visitor as AstVisitor;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::intravisit as hir_visit;
+use rustc_hir::intravisit::Visitor as HirVisitor;
+use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::nested_filter;
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects closures called in the same expression where they
+ /// are defined.
+ ///
+ /// ### Why is this bad?
+ /// It is unnecessarily adding to the expression's
+ /// complexity.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = (|| 42)();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let a = 42;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub REDUNDANT_CLOSURE_CALL,
+ complexity,
+ "throwaway closures called in the expression they are defined"
+}
+
+declare_lint_pass!(RedundantClosureCall => [REDUNDANT_CLOSURE_CALL]);
+
+// Used to find `return` statements or equivalents e.g., `?`
+struct ReturnVisitor {
+ found_return: bool,
+}
+
+impl ReturnVisitor {
+ #[must_use]
+ fn new() -> Self {
+ Self { found_return: false }
+ }
+}
+
+impl<'ast> ast_visit::Visitor<'ast> for ReturnVisitor {
+ fn visit_expr(&mut self, ex: &'ast ast::Expr) {
+ if let ast::ExprKind::Ret(_) | ast::ExprKind::Try(_) = ex.kind {
+ self.found_return = true;
+ }
+
+ ast_visit::walk_expr(self, ex);
+ }
+}
+
+impl EarlyLintPass for RedundantClosureCall {
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &ast::Expr) {
+ if in_external_macro(cx.sess(), expr.span) {
+ return;
+ }
+ if_chain! {
+ if let ast::ExprKind::Call(ref paren, _) = expr.kind;
+ if let ast::ExprKind::Paren(ref closure) = paren.kind;
- let mut app = Applicability::MachineApplicable;
- let hint =
- snippet_with_applicability(cx, block.span, "..", &mut app).into_owned();
- diag.span_suggestion(expr.span, "try doing something like", hint, app);
++ if let ast::ExprKind::Closure(_, _, ref r#async, _, ref decl, ref block, _) = closure.kind;
+ then {
+ let mut visitor = ReturnVisitor::new();
+ visitor.visit_expr(block);
+ if !visitor.found_return {
+ span_lint_and_then(
+ cx,
+ REDUNDANT_CLOSURE_CALL,
+ expr.span,
+ "try not to call a closure in the expression where it is declared",
+ |diag| {
+ if decl.inputs.is_empty() {
++ let app = Applicability::MachineApplicable;
++ let mut hint = Sugg::ast(cx, block, "..");
++
++ if r#async.is_async() {
++ // `async x` is a syntax error, so it becomes `async { x }`
++ if !matches!(block.kind, ast::ExprKind::Block(_, _)) {
++ hint = hint.blockify();
++ }
++
++ hint = hint.asyncify();
++ }
++
++ diag.span_suggestion(expr.span, "try doing something like", hint.to_string(), app);
+ }
+ },
+ );
+ }
+ }
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for RedundantClosureCall {
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
+ fn count_closure_usage<'a, 'tcx>(
+ cx: &'a LateContext<'tcx>,
+ block: &'tcx hir::Block<'_>,
+ path: &'tcx hir::Path<'tcx>,
+ ) -> usize {
+ struct ClosureUsageCount<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ path: &'tcx hir::Path<'tcx>,
+ count: usize,
+ }
+ impl<'a, 'tcx> hir_visit::Visitor<'tcx> for ClosureUsageCount<'a, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+
+ fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
+ if_chain! {
+ if let hir::ExprKind::Call(closure, _) = expr.kind;
+ if let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind;
+ if self.path.segments[0].ident == path.segments[0].ident;
+ if self.path.res == path.res;
+ then {
+ self.count += 1;
+ }
+ }
+ hir_visit::walk_expr(self, expr);
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+ }
+ let mut closure_usage_count = ClosureUsageCount { cx, path, count: 0 };
+ closure_usage_count.visit_block(block);
+ closure_usage_count.count
+ }
+
+ for w in block.stmts.windows(2) {
+ if_chain! {
+ if let hir::StmtKind::Local(local) = w[0].kind;
+ if let Option::Some(t) = local.init;
+ if let hir::ExprKind::Closure { .. } = t.kind;
+ if let hir::PatKind::Binding(_, _, ident, _) = local.pat.kind;
+ if let hir::StmtKind::Semi(second) = w[1].kind;
+ if let hir::ExprKind::Assign(_, call, _) = second.kind;
+ if let hir::ExprKind::Call(closure, _) = call.kind;
+ if let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = closure.kind;
+ if ident == path.segments[0].ident;
+ if count_closure_usage(cx, block, path) == 1;
+ then {
+ span_lint(
+ cx,
+ REDUNDANT_CLOSURE_CALL,
+ second.span,
+ "closure called just once immediately after it was declared",
+ );
+ }
+ }
+ }
+ }
+}
--- /dev/null
- if let ExprKind::Call(fun, args) = expr.kind;
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::{match_def_path, paths};
+use if_chain::if_chain;
+use rustc_ast::ast::{LitKind, StrStyle};
+use rustc_hir::{BorrowKind, Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::{BytePos, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks [regex](https://crates.io/crates/regex) creation
+ /// (with `Regex::new`, `RegexBuilder::new`, or `RegexSet::new`) for correct
+ /// regex syntax.
+ ///
+ /// ### Why is this bad?
+ /// This will lead to a runtime panic.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// Regex::new("(")
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INVALID_REGEX,
+ correctness,
+ "invalid regular expressions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for trivial [regex](https://crates.io/crates/regex)
+ /// creation (with `Regex::new`, `RegexBuilder::new`, or `RegexSet::new`).
+ ///
+ /// ### Why is this bad?
+ /// Matching the regex can likely be replaced by `==` or
+ /// `str::starts_with`, `str::ends_with` or `std::contains` or other `str`
+ /// methods.
+ ///
+ /// ### Known problems
+ /// If the same regex is going to be applied to multiple
+ /// inputs, the precomputations done by `Regex` construction can give
+ /// significantly better performance than any of the `str`-based methods.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// Regex::new("^foobar")
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub TRIVIAL_REGEX,
+ nursery,
+ "trivial regular expressions"
+}
+
+declare_lint_pass!(Regex => [INVALID_REGEX, TRIVIAL_REGEX]);
+
+impl<'tcx> LateLintPass<'tcx> for Regex {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
- if args.len() == 1;
++ if let ExprKind::Call(fun, [arg]) = expr.kind;
+ if let ExprKind::Path(ref qpath) = fun.kind;
- check_regex(cx, &args[0], true);
+ if let Some(def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
+ then {
+ if match_def_path(cx, def_id, &paths::REGEX_NEW) ||
+ match_def_path(cx, def_id, &paths::REGEX_BUILDER_NEW) {
- check_regex(cx, &args[0], false);
++ check_regex(cx, arg, true);
+ } else if match_def_path(cx, def_id, &paths::REGEX_BYTES_NEW) ||
+ match_def_path(cx, def_id, &paths::REGEX_BYTES_BUILDER_NEW) {
- check_set(cx, &args[0], true);
++ check_regex(cx, arg, false);
+ } else if match_def_path(cx, def_id, &paths::REGEX_SET_NEW) {
- check_set(cx, &args[0], false);
++ check_set(cx, arg, true);
+ } else if match_def_path(cx, def_id, &paths::REGEX_BYTES_SET_NEW) {
++ check_set(cx, arg, false);
+ }
+ }
+ }
+ }
+}
+
+#[must_use]
+fn str_span(base: Span, c: regex_syntax::ast::Span, offset: u8) -> Span {
+ let offset = u32::from(offset);
+ let end = base.lo() + BytePos(u32::try_from(c.end.offset).expect("offset too large") + offset);
+ let start = base.lo() + BytePos(u32::try_from(c.start.offset).expect("offset too large") + offset);
+ assert!(start <= end);
+ Span::new(start, end, base.ctxt(), base.parent())
+}
+
+fn const_str<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -> Option<String> {
+ constant(cx, cx.typeck_results(), e).and_then(|(c, _)| match c {
+ Constant::Str(s) => Some(s),
+ _ => None,
+ })
+}
+
+fn is_trivial_regex(s: ®ex_syntax::hir::Hir) -> Option<&'static str> {
+ use regex_syntax::hir::Anchor::{EndText, StartText};
+ use regex_syntax::hir::HirKind::{Alternation, Anchor, Concat, Empty, Literal};
+
+ let is_literal = |e: &[regex_syntax::hir::Hir]| e.iter().all(|e| matches!(*e.kind(), Literal(_)));
+
+ match *s.kind() {
+ Empty | Anchor(_) => Some("the regex is unlikely to be useful as it is"),
+ Literal(_) => Some("consider using `str::contains`"),
+ Alternation(ref exprs) => {
+ if exprs.iter().all(|e| e.kind().is_empty()) {
+ Some("the regex is unlikely to be useful as it is")
+ } else {
+ None
+ }
+ },
+ Concat(ref exprs) => match (exprs[0].kind(), exprs[exprs.len() - 1].kind()) {
+ (&Anchor(StartText), &Anchor(EndText)) if exprs[1..(exprs.len() - 1)].is_empty() => {
+ Some("consider using `str::is_empty`")
+ },
+ (&Anchor(StartText), &Anchor(EndText)) if is_literal(&exprs[1..(exprs.len() - 1)]) => {
+ Some("consider using `==` on `str`s")
+ },
+ (&Anchor(StartText), &Literal(_)) if is_literal(&exprs[1..]) => Some("consider using `str::starts_with`"),
+ (&Literal(_), &Anchor(EndText)) if is_literal(&exprs[1..(exprs.len() - 1)]) => {
+ Some("consider using `str::ends_with`")
+ },
+ _ if is_literal(exprs) => Some("consider using `str::contains`"),
+ _ => None,
+ },
+ _ => None,
+ }
+}
+
+fn check_set<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, utf8: bool) {
+ if_chain! {
+ if let ExprKind::AddrOf(BorrowKind::Ref, _, expr) = expr.kind;
+ if let ExprKind::Array(exprs) = expr.kind;
+ then {
+ for expr in exprs {
+ check_regex(cx, expr, utf8);
+ }
+ }
+ }
+}
+
+fn check_regex<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, utf8: bool) {
+ let mut parser = regex_syntax::ParserBuilder::new()
+ .unicode(true)
+ .allow_invalid_utf8(!utf8)
+ .build();
+
+ if let ExprKind::Lit(ref lit) = expr.kind {
+ if let LitKind::Str(ref r, style) = lit.node {
+ let r = r.as_str();
+ let offset = if let StrStyle::Raw(n) = style { 2 + n } else { 1 };
+ match parser.parse(r) {
+ Ok(r) => {
+ if let Some(repl) = is_trivial_regex(&r) {
+ span_lint_and_help(cx, TRIVIAL_REGEX, expr.span, "trivial regex", None, repl);
+ }
+ },
+ Err(regex_syntax::Error::Parse(e)) => {
+ span_lint(
+ cx,
+ INVALID_REGEX,
+ str_span(expr.span, *e.span(), offset),
+ &format!("regex syntax error: {}", e.kind()),
+ );
+ },
+ Err(regex_syntax::Error::Translate(e)) => {
+ span_lint(
+ cx,
+ INVALID_REGEX,
+ str_span(expr.span, *e.span(), offset),
+ &format!("regex syntax error: {}", e.kind()),
+ );
+ },
+ Err(e) => {
+ span_lint(cx, INVALID_REGEX, expr.span, &format!("regex syntax error: {}", e));
+ },
+ }
+ }
+ } else if let Some(r) = const_str(cx, expr) {
+ match parser.parse(&r) {
+ Ok(r) => {
+ if let Some(repl) = is_trivial_regex(&r) {
+ span_lint_and_help(cx, TRIVIAL_REGEX, expr.span, "trivial regex", None, repl);
+ }
+ },
+ Err(regex_syntax::Error::Parse(e)) => {
+ span_lint(
+ cx,
+ INVALID_REGEX,
+ expr.span,
+ &format!("regex syntax error on position {}: {}", e.span().start.offset, e.kind()),
+ );
+ },
+ Err(regex_syntax::Error::Translate(e)) => {
+ span_lint(
+ cx,
+ INVALID_REGEX,
+ expr.span,
+ &format!("regex syntax error on position {}: {}", e.span().start.offset, e.kind()),
+ );
+ },
+ Err(e) => {
+ span_lint(cx, INVALID_REGEX, expr.span, &format!("regex syntax error: {}", e));
+ },
+ }
+ }
+}
--- /dev/null
+// This file is managed by `cargo dev rename_lint`. Prefer using that when possible.
+
+#[rustfmt::skip]
+pub static RENAMED_LINTS: &[(&str, &str)] = &[
++ ("clippy::blacklisted_name", "clippy::disallowed_names"),
+ ("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions"),
+ ("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions"),
+ ("clippy::box_vec", "clippy::box_collection"),
+ ("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes"),
+ ("clippy::cyclomatic_complexity", "clippy::cognitive_complexity"),
+ ("clippy::disallowed_method", "clippy::disallowed_methods"),
+ ("clippy::disallowed_type", "clippy::disallowed_types"),
+ ("clippy::eval_order_dependence", "clippy::mixed_read_write_in_expression"),
+ ("clippy::for_loop_over_option", "clippy::for_loops_over_fallibles"),
+ ("clippy::for_loop_over_result", "clippy::for_loops_over_fallibles"),
+ ("clippy::identity_conversion", "clippy::useless_conversion"),
+ ("clippy::if_let_some_result", "clippy::match_result_ok"),
++ ("clippy::logic_bug", "clippy::overly_complex_bool_expr"),
+ ("clippy::new_without_default_derive", "clippy::new_without_default"),
+ ("clippy::option_and_then_some", "clippy::bind_instead_of_map"),
+ ("clippy::option_expect_used", "clippy::expect_used"),
+ ("clippy::option_map_unwrap_or", "clippy::map_unwrap_or"),
+ ("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or"),
+ ("clippy::option_unwrap_used", "clippy::unwrap_used"),
+ ("clippy::ref_in_deref", "clippy::needless_borrow"),
+ ("clippy::result_expect_used", "clippy::expect_used"),
+ ("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or"),
+ ("clippy::result_unwrap_used", "clippy::unwrap_used"),
+ ("clippy::single_char_push_str", "clippy::single_char_add_str"),
+ ("clippy::stutter", "clippy::module_name_repetitions"),
+ ("clippy::to_string_in_display", "clippy::recursive_format_impl"),
+ ("clippy::zero_width_space", "clippy::invisible_characters"),
+ ("clippy::drop_bounds", "drop_bounds"),
+ ("clippy::into_iter_on_array", "array_into_iter"),
+ ("clippy::invalid_atomic_ordering", "invalid_atomic_ordering"),
+ ("clippy::invalid_ref", "invalid_value"),
+ ("clippy::mem_discriminant_non_enum", "enum_intrinsics_non_enums"),
+ ("clippy::panic_params", "non_fmt_panics"),
+ ("clippy::temporary_cstring_as_ptr", "temporary_cstring_as_ptr"),
+ ("clippy::unknown_clippy_lints", "unknown_lints"),
+ ("clippy::unused_label", "unused_labels"),
+];
--- /dev/null
- if let ExprKind::MethodCall(take_path, take_args, _) = expr.kind;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::{get_enclosing_block, is_expr_path_def_path, path_to_local, path_to_local_id, paths, SpanlessEq};
+use if_chain::if_chain;
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::{walk_block, walk_expr, walk_stmt, Visitor};
+use rustc_hir::{BindingAnnotation, Block, Expr, ExprKind, HirId, PatKind, QPath, Stmt, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::symbol::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks slow zero-filled vector initialization
+ ///
+ /// ### Why is this bad?
+ /// These structures are non-idiomatic and less efficient than simply using
+ /// `vec![0; len]`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use core::iter::repeat;
+ /// # let len = 4;
+ /// let mut vec1 = Vec::with_capacity(len);
+ /// vec1.resize(len, 0);
+ ///
+ /// let mut vec1 = Vec::with_capacity(len);
+ /// vec1.resize(vec1.capacity(), 0);
+ ///
+ /// let mut vec2 = Vec::with_capacity(len);
+ /// vec2.extend(repeat(0).take(len));
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// # let len = 4;
+ /// let mut vec1 = vec![0; len];
+ /// let mut vec2 = vec![0; len];
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub SLOW_VECTOR_INITIALIZATION,
+ perf,
+ "slow vector initialization"
+}
+
+declare_lint_pass!(SlowVectorInit => [SLOW_VECTOR_INITIALIZATION]);
+
+/// `VecAllocation` contains data regarding a vector allocated with `with_capacity` and then
+/// assigned to a variable. For example, `let mut vec = Vec::with_capacity(0)` or
+/// `vec = Vec::with_capacity(0)`
+struct VecAllocation<'tcx> {
+ /// HirId of the variable
+ local_id: HirId,
+
+ /// Reference to the expression which allocates the vector
+ allocation_expr: &'tcx Expr<'tcx>,
+
+ /// Reference to the expression used as argument on `with_capacity` call. This is used
+ /// to only match slow zero-filling idioms of the same length than vector initialization.
+ len_expr: &'tcx Expr<'tcx>,
+}
+
+/// Type of slow initialization
+enum InitializationType<'tcx> {
+ /// Extend is a slow initialization with the form `vec.extend(repeat(0).take(..))`
+ Extend(&'tcx Expr<'tcx>),
+
+ /// Resize is a slow initialization with the form `vec.resize(.., 0)`
+ Resize(&'tcx Expr<'tcx>),
+}
+
+impl<'tcx> LateLintPass<'tcx> for SlowVectorInit {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Matches initialization on reassignements. For example: `vec = Vec::with_capacity(100)`
+ if_chain! {
+ if let ExprKind::Assign(left, right, _) = expr.kind;
+
+ // Extract variable
+ if let Some(local_id) = path_to_local(left);
+
+ // Extract len argument
+ if let Some(len_arg) = Self::is_vec_with_capacity(cx, right);
+
+ then {
+ let vi = VecAllocation {
+ local_id,
+ allocation_expr: right,
+ len_expr: len_arg,
+ };
+
+ Self::search_initialization(cx, vi, expr.hir_id);
+ }
+ }
+ }
+
+ fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
+ // Matches statements which initializes vectors. For example: `let mut vec = Vec::with_capacity(10)`
+ if_chain! {
+ if let StmtKind::Local(local) = stmt.kind;
+ if let PatKind::Binding(BindingAnnotation::Mutable, local_id, _, None) = local.pat.kind;
+ if let Some(init) = local.init;
+ if let Some(len_arg) = Self::is_vec_with_capacity(cx, init);
+
+ then {
+ let vi = VecAllocation {
+ local_id,
+ allocation_expr: init,
+ len_expr: len_arg,
+ };
+
+ Self::search_initialization(cx, vi, stmt.hir_id);
+ }
+ }
+ }
+}
+
+impl SlowVectorInit {
+ /// Checks if the given expression is `Vec::with_capacity(..)`. It will return the expression
+ /// of the first argument of `with_capacity` call if it matches or `None` if it does not.
+ fn is_vec_with_capacity<'tcx>(cx: &LateContext<'_>, expr: &Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
+ if_chain! {
+ if let ExprKind::Call(func, [arg]) = expr.kind;
+ if let ExprKind::Path(QPath::TypeRelative(ty, name)) = func.kind;
+ if name.ident.as_str() == "with_capacity";
+ if is_type_diagnostic_item(cx, cx.typeck_results().node_type(ty.hir_id), sym::Vec);
+ then {
+ Some(arg)
+ } else {
+ None
+ }
+ }
+ }
+
+ /// Search initialization for the given vector
+ fn search_initialization<'tcx>(cx: &LateContext<'tcx>, vec_alloc: VecAllocation<'tcx>, parent_node: HirId) {
+ let enclosing_body = get_enclosing_block(cx, parent_node);
+
+ if enclosing_body.is_none() {
+ return;
+ }
+
+ let mut v = VectorInitializationVisitor {
+ cx,
+ vec_alloc,
+ slow_expression: None,
+ initialization_found: false,
+ };
+
+ v.visit_block(enclosing_body.unwrap());
+
+ if let Some(ref allocation_expr) = v.slow_expression {
+ Self::lint_initialization(cx, allocation_expr, &v.vec_alloc);
+ }
+ }
+
+ fn lint_initialization<'tcx>(
+ cx: &LateContext<'tcx>,
+ initialization: &InitializationType<'tcx>,
+ vec_alloc: &VecAllocation<'_>,
+ ) {
+ match initialization {
+ InitializationType::Extend(e) | InitializationType::Resize(e) => {
+ Self::emit_lint(cx, e, vec_alloc, "slow zero-filling initialization");
+ },
+ };
+ }
+
+ fn emit_lint<'tcx>(cx: &LateContext<'tcx>, slow_fill: &Expr<'_>, vec_alloc: &VecAllocation<'_>, msg: &str) {
+ let len_expr = Sugg::hir(cx, vec_alloc.len_expr, "len");
+
+ span_lint_and_then(cx, SLOW_VECTOR_INITIALIZATION, slow_fill.span, msg, |diag| {
+ diag.span_suggestion(
+ vec_alloc.allocation_expr.span,
+ "consider replace allocation with",
+ format!("vec![0; {}]", len_expr),
+ Applicability::Unspecified,
+ );
+ });
+ }
+}
+
+/// `VectorInitializationVisitor` searches for unsafe or slow vector initializations for the given
+/// vector.
+struct VectorInitializationVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+
+ /// Contains the information.
+ vec_alloc: VecAllocation<'tcx>,
+
+ /// Contains the slow initialization expression, if one was found.
+ slow_expression: Option<InitializationType<'tcx>>,
+
+ /// `true` if the initialization of the vector has been found on the visited block.
+ initialization_found: bool,
+}
+
+impl<'a, 'tcx> VectorInitializationVisitor<'a, 'tcx> {
+ /// Checks if the given expression is extending a vector with `repeat(0).take(..)`
+ fn search_slow_extend_filling(&mut self, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ if self.initialization_found;
+ if let ExprKind::MethodCall(path, [self_arg, extend_arg], _) = expr.kind;
+ if path_to_local_id(self_arg, self.vec_alloc.local_id);
+ if path.ident.name == sym!(extend);
+ if self.is_repeat_take(extend_arg);
+
+ then {
+ self.slow_expression = Some(InitializationType::Extend(expr));
+ }
+ }
+ }
+
+ /// Checks if the given expression is resizing a vector with 0
+ fn search_slow_resize_filling(&mut self, expr: &'tcx Expr<'_>) {
+ if self.initialization_found
+ && let ExprKind::MethodCall(path, [self_arg, len_arg, fill_arg], _) = expr.kind
+ && path_to_local_id(self_arg, self.vec_alloc.local_id)
+ && path.ident.name == sym!(resize)
+ // Check that is filled with 0
+ && let ExprKind::Lit(ref lit) = fill_arg.kind
+ && let LitKind::Int(0, _) = lit.node {
+ // Check that len expression is equals to `with_capacity` expression
+ if SpanlessEq::new(self.cx).eq_expr(len_arg, self.vec_alloc.len_expr) {
+ self.slow_expression = Some(InitializationType::Resize(expr));
+ } else if let ExprKind::MethodCall(path, _, _) = len_arg.kind && path.ident.as_str() == "capacity" {
+ self.slow_expression = Some(InitializationType::Resize(expr));
+ }
+ }
+ }
+
+ /// Returns `true` if give expression is `repeat(0).take(...)`
+ fn is_repeat_take(&self, expr: &Expr<'_>) -> bool {
+ if_chain! {
-
++ if let ExprKind::MethodCall(take_path, [recv, len_arg, ..], _) = expr.kind;
+ if take_path.ident.name == sym!(take);
- if let Some(repeat_expr) = take_args.get(0);
- if self.is_repeat_zero(repeat_expr);
-
- if let Some(len_arg) = take_args.get(1);
-
+ // Check that take is applied to `repeat(0)`
++ if self.is_repeat_zero(recv);
+ then {
+ // Check that len expression is equals to `with_capacity` expression
+ if SpanlessEq::new(self.cx).eq_expr(len_arg, self.vec_alloc.len_expr) {
+ return true;
+ } else if let ExprKind::MethodCall(path, _, _) = len_arg.kind && path.ident.as_str() == "capacity" {
+ return true;
+ }
+ }
+ }
+
+ false
+ }
+
+ /// Returns `true` if given expression is `repeat(0)`
+ fn is_repeat_zero(&self, expr: &Expr<'_>) -> bool {
+ if_chain! {
+ if let ExprKind::Call(fn_expr, [repeat_arg]) = expr.kind;
+ if is_expr_path_def_path(self.cx, fn_expr, &paths::ITER_REPEAT);
+ if let ExprKind::Lit(ref lit) = repeat_arg.kind;
+ if let LitKind::Int(0, _) = lit.node;
+
+ then {
+ true
+ } else {
+ false
+ }
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for VectorInitializationVisitor<'a, 'tcx> {
+ fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
+ if self.initialization_found {
+ match stmt.kind {
+ StmtKind::Expr(expr) | StmtKind::Semi(expr) => {
+ self.search_slow_extend_filling(expr);
+ self.search_slow_resize_filling(expr);
+ },
+ _ => (),
+ }
+
+ self.initialization_found = false;
+ } else {
+ walk_stmt(self, stmt);
+ }
+ }
+
+ fn visit_block(&mut self, block: &'tcx Block<'_>) {
+ if self.initialization_found {
+ if let Some(s) = block.stmts.get(0) {
+ self.visit_stmt(s);
+ }
+
+ self.initialization_found = false;
+ } else {
+ walk_block(self, block);
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
+ // Skip all the expressions previous to the vector initialization
+ if self.vec_alloc.allocation_expr.hir_id == expr.hir_id {
+ self.initialization_found = true;
+ }
+
+ walk_expr(self, expr);
+ }
+}
--- /dev/null
- if let ExprKind::MethodCall(method_name, args, _) = &expr.kind;
- if let Some(slice) = &args.get(0);
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::{is_slice_of_primitives, sugg::Sugg};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// When sorting primitive values (integers, bools, chars, as well
+ /// as arrays, slices, and tuples of such items), it is typically better to
+ /// use an unstable sort than a stable sort.
+ ///
+ /// ### Why is this bad?
+ /// Typically, using a stable sort consumes more memory and cpu cycles.
+ /// Because values which compare equal are identical, preserving their
+ /// relative order (the guarantee that a stable sort provides) means
+ /// nothing, while the extra costs still apply.
+ ///
+ /// ### Known problems
+ ///
+ /// As pointed out in
+ /// [issue #8241](https://github.com/rust-lang/rust-clippy/issues/8241),
+ /// a stable sort can instead be significantly faster for certain scenarios
+ /// (eg. when a sorted vector is extended with new data and resorted).
+ ///
+ /// For more information and benchmarking results, please refer to the
+ /// issue linked above.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut vec = vec![2, 1, 3];
+ /// vec.sort();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let mut vec = vec![2, 1, 3];
+ /// vec.sort_unstable();
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub STABLE_SORT_PRIMITIVE,
+ pedantic,
+ "use of sort() when sort_unstable() is equivalent"
+}
+
+declare_lint_pass!(StableSortPrimitive => [STABLE_SORT_PRIMITIVE]);
+
+/// The three "kinds" of sorts
+enum SortingKind {
+ Vanilla,
+ /* The other kinds of lint are currently commented out because they
+ * can map distinct values to equal ones. If the key function is
+ * provably one-to-one, or if the Cmp function conserves equality,
+ * then they could be linted on, but I don't know if we can check
+ * for that. */
+
+ /* ByKey,
+ * ByCmp, */
+}
+impl SortingKind {
+ /// The name of the stable version of this kind of sort
+ fn stable_name(&self) -> &str {
+ match self {
+ SortingKind::Vanilla => "sort",
+ /* SortingKind::ByKey => "sort_by_key",
+ * SortingKind::ByCmp => "sort_by", */
+ }
+ }
+ /// The name of the unstable version of this kind of sort
+ fn unstable_name(&self) -> &str {
+ match self {
+ SortingKind::Vanilla => "sort_unstable",
+ /* SortingKind::ByKey => "sort_unstable_by_key",
+ * SortingKind::ByCmp => "sort_unstable_by", */
+ }
+ }
+ /// Takes the name of a function call and returns the kind of sort
+ /// that corresponds to that function name (or None if it isn't)
+ fn from_stable_name(name: &str) -> Option<SortingKind> {
+ match name {
+ "sort" => Some(SortingKind::Vanilla),
+ // "sort_by" => Some(SortingKind::ByCmp),
+ // "sort_by_key" => Some(SortingKind::ByKey),
+ _ => None,
+ }
+ }
+}
+
+/// A detected instance of this lint
+struct LintDetection {
+ slice_name: String,
+ method: SortingKind,
+ method_args: String,
+ slice_type: String,
+}
+
+fn detect_stable_sort_primitive(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<LintDetection> {
+ if_chain! {
- let args_str = args.iter().skip(1).map(|arg| Sugg::hir(cx, arg, "..").to_string()).collect::<Vec<String>>().join(", ");
++ if let ExprKind::MethodCall(method_name, [slice, args @ ..], _) = &expr.kind;
+ if let Some(method) = SortingKind::from_stable_name(method_name.ident.name.as_str());
+ if let Some(slice_type) = is_slice_of_primitives(cx, slice);
+ then {
++ let args_str = args.iter().map(|arg| Sugg::hir(cx, arg, "..").to_string()).collect::<Vec<String>>().join(", ");
+ Some(LintDetection { slice_name: Sugg::hir(cx, slice, "..").to_string(), method, method_args: args_str, slice_type })
+ } else {
+ None
+ }
+ }
+}
+
+impl LateLintPass<'_> for StableSortPrimitive {
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if let Some(detection) = detect_stable_sort_primitive(cx, expr) {
+ span_lint_and_then(
+ cx,
+ STABLE_SORT_PRIMITIVE,
+ expr.span,
+ format!(
+ "used `{}` on primitive type `{}`",
+ detection.method.stable_name(),
+ detection.slice_type,
+ )
+ .as_str(),
+ |diag| {
+ diag.span_suggestion(
+ expr.span,
+ "try",
+ format!(
+ "{}.{}({})",
+ detection.slice_name,
+ detection.method.unstable_name(),
+ detection.method_args,
+ ),
+ Applicability::MachineApplicable,
+ );
+ diag.note(
+ "an unstable sort typically performs faster without any observable difference for this data type",
+ );
+ },
+ );
+ }
+ }
+}
--- /dev/null
- fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
+mod let_unit_value;
+mod unit_arg;
+mod unit_cmp;
+mod utils;
+
+use rustc_hir::{Expr, Local};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for binding a unit value.
+ ///
+ /// ### Why is this bad?
+ /// A unit value cannot usefully be used anywhere. So
+ /// binding one is kind of pointless.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = {
+ /// 1;
+ /// };
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub LET_UNIT_VALUE,
+ style,
+ "creating a `let` binding to a value of unit type, which usually can't be used afterwards"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for comparisons to unit. This includes all binary
+ /// comparisons (like `==` and `<`) and asserts.
+ ///
+ /// ### Why is this bad?
+ /// Unit is always equal to itself, and thus is just a
+ /// clumsily written constant. Mostly this happens when someone accidentally
+ /// adds semicolons at the end of the operands.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn foo() {};
+ /// # fn bar() {};
+ /// # fn baz() {};
+ /// if {
+ /// foo();
+ /// } == {
+ /// bar();
+ /// } {
+ /// baz();
+ /// }
+ /// ```
+ /// is equal to
+ /// ```rust
+ /// # fn foo() {};
+ /// # fn bar() {};
+ /// # fn baz() {};
+ /// {
+ /// foo();
+ /// bar();
+ /// baz();
+ /// }
+ /// ```
+ ///
+ /// For asserts:
+ /// ```rust
+ /// # fn foo() {};
+ /// # fn bar() {};
+ /// assert_eq!({ foo(); }, { bar(); });
+ /// ```
+ /// will always succeed
+ #[clippy::version = "pre 1.29.0"]
+ pub UNIT_CMP,
+ correctness,
+ "comparing unit values"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for passing a unit value as an argument to a function without using a
+ /// unit literal (`()`).
+ ///
+ /// ### Why is this bad?
+ /// This is likely the result of an accidental semicolon.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// foo({
+ /// let a = bar();
+ /// baz(a);
+ /// })
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNIT_ARG,
+ complexity,
+ "passing unit to a function"
+}
+
+declare_lint_pass!(UnitTypes => [LET_UNIT_VALUE, UNIT_CMP, UNIT_ARG]);
+
+impl<'tcx> LateLintPass<'tcx> for UnitTypes {
+ fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx Local<'tcx>) {
+ let_unit_value::check(cx, local);
+ }
+
++ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ unit_cmp::check(cx, expr);
+ unit_arg::check(cx, expr);
+ }
+}
--- /dev/null
- pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
+use clippy_utils::diagnostics::span_lint_and_then;
++use clippy_utils::is_from_proc_macro;
+use clippy_utils::source::{indent_of, reindent_multiline, snippet_opt};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{self as hir, Block, Expr, ExprKind, MatchSource, Node, StmtKind};
+use rustc_lint::LateContext;
+
+use super::{utils, UNIT_ARG};
+
- if !args_to_recover.is_empty() {
++pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ // apparently stuff in the desugaring of `?` can trigger this
+ // so check for that here
+ // only the calls to `Try::from_error` is marked as desugared,
+ // so we need to check both the current Expr and its parent.
+ if is_questionmark_desugar_marked_call(expr) {
+ return;
+ }
+ let map = &cx.tcx.hir();
+ let opt_parent_node = map.find(map.get_parent_node(expr.hir_id));
+ if_chain! {
+ if let Some(hir::Node::Expr(parent_expr)) = opt_parent_node;
+ if is_questionmark_desugar_marked_call(parent_expr);
+ then {
+ return;
+ }
+ }
+
+ match expr.kind {
+ ExprKind::Call(_, args) | ExprKind::MethodCall(_, args, _) => {
+ let args_to_recover = args
+ .iter()
+ .filter(|arg| {
+ if cx.typeck_results().expr_ty(arg).is_unit() && !utils::is_unit_literal(arg) {
+ !matches!(
+ &arg.kind,
+ ExprKind::Match(.., MatchSource::TryDesugar) | ExprKind::Path(..)
+ )
+ } else {
+ false
+ }
+ })
+ .collect::<Vec<_>>();
++ if !args_to_recover.is_empty() && !is_from_proc_macro(cx, expr) {
+ lint_unit_args(cx, expr, &args_to_recover);
+ }
+ },
+ _ => (),
+ }
+}
+
+fn is_questionmark_desugar_marked_call(expr: &Expr<'_>) -> bool {
+ use rustc_span::hygiene::DesugaringKind;
+ if let ExprKind::Call(callee, _) = expr.kind {
+ callee.span.is_desugaring(DesugaringKind::QuestionMark)
+ } else {
+ false
+ }
+}
+
+fn lint_unit_args(cx: &LateContext<'_>, expr: &Expr<'_>, args_to_recover: &[&Expr<'_>]) {
+ let mut applicability = Applicability::MachineApplicable;
+ let (singular, plural) = if args_to_recover.len() > 1 {
+ ("", "s")
+ } else {
+ ("a ", "")
+ };
+ span_lint_and_then(
+ cx,
+ UNIT_ARG,
+ expr.span,
+ &format!("passing {}unit value{} to a function", singular, plural),
+ |db| {
+ let mut or = "";
+ args_to_recover
+ .iter()
+ .filter_map(|arg| {
+ if_chain! {
+ if let ExprKind::Block(block, _) = arg.kind;
+ if block.expr.is_none();
+ if let Some(last_stmt) = block.stmts.iter().last();
+ if let StmtKind::Semi(last_expr) = last_stmt.kind;
+ if let Some(snip) = snippet_opt(cx, last_expr.span);
+ then {
+ Some((
+ last_stmt.span,
+ snip,
+ ))
+ }
+ else {
+ None
+ }
+ }
+ })
+ .for_each(|(span, sugg)| {
+ db.span_suggestion(
+ span,
+ "remove the semicolon from the last statement in the block",
+ sugg,
+ Applicability::MaybeIncorrect,
+ );
+ or = "or ";
+ applicability = Applicability::MaybeIncorrect;
+ });
+
+ let arg_snippets: Vec<String> = args_to_recover
+ .iter()
+ .filter_map(|arg| snippet_opt(cx, arg.span))
+ .collect();
+ let arg_snippets_without_empty_blocks: Vec<String> = args_to_recover
+ .iter()
+ .filter(|arg| !is_empty_block(arg))
+ .filter_map(|arg| snippet_opt(cx, arg.span))
+ .collect();
+
+ if let Some(call_snippet) = snippet_opt(cx, expr.span) {
+ let sugg = fmt_stmts_and_call(
+ cx,
+ expr,
+ &call_snippet,
+ &arg_snippets,
+ &arg_snippets_without_empty_blocks,
+ );
+
+ if arg_snippets_without_empty_blocks.is_empty() {
+ db.multipart_suggestion(
+ &format!("use {}unit literal{} instead", singular, plural),
+ args_to_recover
+ .iter()
+ .map(|arg| (arg.span, "()".to_string()))
+ .collect::<Vec<_>>(),
+ applicability,
+ );
+ } else {
+ let plural = arg_snippets_without_empty_blocks.len() > 1;
+ let empty_or_s = if plural { "s" } else { "" };
+ let it_or_them = if plural { "them" } else { "it" };
+ db.span_suggestion(
+ expr.span,
+ &format!(
+ "{}move the expression{} in front of the call and replace {} with the unit literal `()`",
+ or, empty_or_s, it_or_them
+ ),
+ sugg,
+ applicability,
+ );
+ }
+ }
+ },
+ );
+}
+
+fn is_empty_block(expr: &Expr<'_>) -> bool {
+ matches!(
+ expr.kind,
+ ExprKind::Block(
+ Block {
+ stmts: &[],
+ expr: None,
+ ..
+ },
+ _,
+ )
+ )
+}
+
+fn fmt_stmts_and_call(
+ cx: &LateContext<'_>,
+ call_expr: &Expr<'_>,
+ call_snippet: &str,
+ args_snippets: &[impl AsRef<str>],
+ non_empty_block_args_snippets: &[impl AsRef<str>],
+) -> String {
+ let call_expr_indent = indent_of(cx, call_expr.span).unwrap_or(0);
+ let call_snippet_with_replacements = args_snippets
+ .iter()
+ .fold(call_snippet.to_owned(), |acc, arg| acc.replacen(arg.as_ref(), "()", 1));
+
+ let mut stmts_and_call = non_empty_block_args_snippets
+ .iter()
+ .map(|it| it.as_ref().to_owned())
+ .collect::<Vec<_>>();
+ stmts_and_call.push(call_snippet_with_replacements);
+ stmts_and_call = stmts_and_call
+ .into_iter()
+ .map(|v| reindent_multiline(v.into(), true, Some(call_expr_indent)).into_owned())
+ .collect();
+
+ let mut stmts_and_call_snippet = stmts_and_call.join(&format!("{}{}", ";\n", " ".repeat(call_expr_indent)));
+ // expr is not in a block statement or result expression position, wrap in a block
+ let parent_node = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(call_expr.hir_id));
+ if !matches!(parent_node, Some(Node::Block(_))) && !matches!(parent_node, Some(Node::Stmt(_))) {
+ let block_indent = call_expr_indent + 4;
+ stmts_and_call_snippet =
+ reindent_multiline(stmts_and_call_snippet.into(), true, Some(block_indent)).into_owned();
+ stmts_and_call_snippet = format!(
+ "{{\n{}{}\n{}}}",
+ " ".repeat(block_indent),
+ &stmts_and_call_snippet,
+ " ".repeat(call_expr_indent)
+ );
+ }
+ stmts_and_call_snippet
+}
--- /dev/null
- if let ExprKind::Call(_, args) = e.kind {
- self.try_desugar_arm.push(args[0].hir_id);
+use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg};
+use clippy_utils::source::{snippet, snippet_with_macro_callsite};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::{is_type_diagnostic_item, same_type_and_consts};
+use clippy_utils::{get_parent_expr, is_trait_method, match_def_path, paths};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, HirId, MatchSource};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::sym;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `Into`, `TryInto`, `From`, `TryFrom`, or `IntoIter` calls
+ /// which uselessly convert to the same type.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // format!() returns a `String`
+ /// let s: String = format!("hello").into();
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust
+ /// let s: String = format!("hello");
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub USELESS_CONVERSION,
+ complexity,
+ "calls to `Into`, `TryInto`, `From`, `TryFrom`, or `IntoIter` which perform useless conversions to the same type"
+}
+
+#[derive(Default)]
+pub struct UselessConversion {
+ try_desugar_arm: Vec<HirId>,
+}
+
+impl_lint_pass!(UselessConversion => [USELESS_CONVERSION]);
+
+#[expect(clippy::too_many_lines)]
+impl<'tcx> LateLintPass<'tcx> for UselessConversion {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if e.span.from_expansion() {
+ return;
+ }
+
+ if Some(&e.hir_id) == self.try_desugar_arm.last() {
+ return;
+ }
+
+ match e.kind {
+ ExprKind::Match(_, arms, MatchSource::TryDesugar) => {
+ let e = match arms[0].body.kind {
+ ExprKind::Ret(Some(e)) | ExprKind::Break(_, Some(e)) => e,
+ _ => return,
+ };
- ExprKind::MethodCall(name, .., args, _) => {
++ if let ExprKind::Call(_, [arg, ..]) = e.kind {
++ self.try_desugar_arm.push(arg.hir_id);
+ }
+ },
+
- let b = cx.typeck_results().expr_ty(&args[0]);
++ ExprKind::MethodCall(name, .., [recv, ..], _) => {
+ if is_trait_method(cx, e, sym::Into) && name.ident.as_str() == "into" {
+ let a = cx.typeck_results().expr_ty(e);
- let sugg = snippet_with_macro_callsite(cx, args[0].span, "<expr>").to_string();
++ let b = cx.typeck_results().expr_ty(recv);
+ if same_type_and_consts(a, b) {
- let b = cx.typeck_results().expr_ty(&args[0]);
++ let sugg = snippet_with_macro_callsite(cx, recv.span, "<expr>").to_string();
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{}`", b),
+ "consider removing `.into()`",
+ sugg,
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ if is_trait_method(cx, e, sym::IntoIterator) && name.ident.name == sym::into_iter {
+ if let Some(parent_expr) = get_parent_expr(cx, e) {
+ if let ExprKind::MethodCall(parent_name, ..) = parent_expr.kind {
+ if parent_name.ident.name != sym::into_iter {
+ return;
+ }
+ }
+ }
+ let a = cx.typeck_results().expr_ty(e);
- let sugg = snippet(cx, args[0].span, "<expr>").into_owned();
++ let b = cx.typeck_results().expr_ty(recv);
+ if same_type_and_consts(a, b) {
- let b = cx.typeck_results().expr_ty(&args[0]);
++ let sugg = snippet(cx, recv.span, "<expr>").into_owned();
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{}`", b),
+ "consider removing `.into_iter()`",
+ sugg,
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ if_chain! {
+ if is_trait_method(cx, e, sym::TryInto) && name.ident.name == sym::try_into;
+ let a = cx.typeck_results().expr_ty(e);
- ExprKind::Call(path, args) => {
++ let b = cx.typeck_results().expr_ty(recv);
+ if is_type_diagnostic_item(cx, a, sym::Result);
+ if let ty::Adt(_, substs) = a.kind();
+ if let Some(a_type) = substs.types().next();
+ if same_type_and_consts(a_type, b);
+
+ then {
+ span_lint_and_help(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{}`", b),
+ None,
+ "consider removing `.try_into()`",
+ );
+ }
+ }
+ },
+
- if args.len() == 1;
++ ExprKind::Call(path, [arg]) => {
+ if_chain! {
- let b = cx.typeck_results().expr_ty(&args[0]);
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let Some(def_id) = cx.qpath_res(qpath, path.hir_id).opt_def_id();
+ then {
+ let a = cx.typeck_results().expr_ty(e);
- let sugg = Sugg::hir_with_macro_callsite(cx, &args[0], "<expr>").maybe_par();
++ let b = cx.typeck_results().expr_ty(arg);
+ if_chain! {
+ if match_def_path(cx, def_id, &paths::TRY_FROM);
+ if is_type_diagnostic_item(cx, a, sym::Result);
+ if let ty::Adt(_, substs) = a.kind();
+ if let Some(a_type) = substs.types().next();
+ if same_type_and_consts(a_type, b);
+
+ then {
+ let hint = format!("consider removing `{}()`", snippet(cx, path.span, "TryFrom::try_from"));
+ span_lint_and_help(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{}`", b),
+ None,
+ &hint,
+ );
+ }
+ }
+
+ if_chain! {
+ if match_def_path(cx, def_id, &paths::FROM_FROM);
+ if same_type_and_consts(a, b);
+
+ then {
++ let sugg = Sugg::hir_with_macro_callsite(cx, arg, "<expr>").maybe_par();
+ let sugg_msg =
+ format!("consider removing `{}()`", snippet(cx, path.span, "From::from"));
+ span_lint_and_sugg(
+ cx,
+ USELESS_CONVERSION,
+ e.span,
+ &format!("useless conversion to the same type: `{}`", b),
+ &sugg_msg,
+ sugg.to_string(),
+ Applicability::MachineApplicable, // snippet
+ );
+ }
+ }
+ }
+ }
+ },
+
+ _ => {},
+ }
+ }
+
+ fn check_expr_post(&mut self, _: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if Some(&e.hir_id) == self.try_desugar_arm.last() {
+ self.try_desugar_arm.pop();
+ }
+ }
+}
--- /dev/null
- const DEFAULT_BLACKLISTED_NAMES: &[&str] = &["foo", "baz", "quux"];
+//! 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",
+];
- fn conf_error(s: String) -> Box<dyn Error> {
- Box::new(ConfError(s))
++const DEFAULT_DISALLOWED_NAMES: &[&str] = &["foo", "baz", "quux"];
+
+/// Holds information used by `MISSING_ENFORCED_IMPORT_RENAMES` lint.
+#[derive(Clone, Debug, Deserialize)]
+pub struct Rename {
+ pub path: String,
+ pub rename: String,
+}
+
+/// 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>>,
++ pub warnings: Vec<Box<dyn Error>>,
+}
+
+impl TryConf {
+ fn from_error(error: impl Error + 'static) -> Self {
+ Self {
+ conf: Conf::default(),
+ errors: vec![Box::new(error)],
++ warnings: vec![],
+ }
+ }
+}
+
+#[derive(Debug)]
+struct ConfError(String);
+
+impl fmt::Display for ConfError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ <String as fmt::Display>::fmt(&self.0, f)
+ }
+}
+
+impl Error for ConfError {}
+
- $(#[conf_deprecated($dep:literal)])?
++fn conf_error(s: impl Into<String>) -> Box<dyn Error> {
++ Box::new(ConfError(s.into()))
+}
+
+macro_rules! define_Conf {
+ ($(
+ $(#[doc = $doc:literal])+
- $(errors.push(conf_error(format!("deprecated field `{}`. {}", name, $dep)));)?
++ $(#[conf_deprecated($dep:literal, $new_conf:ident)])?
+ ($name:ident: $ty:ty = $default:expr),
+ )*) => {
+ /// Clippy lint configuration
+ pub struct Conf {
+ $($(#[doc = $doc])+ pub $name: $ty,)*
+ }
+
+ mod defaults {
+ $(pub fn $name() -> $ty { $default })*
+ }
+
+ impl Default for Conf {
+ fn default() -> Self {
+ Self { $($name: defaults::$name(),)* }
+ }
+ }
+
+ impl<'de> Deserialize<'de> for TryConf {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
+ deserializer.deserialize_map(ConfVisitor)
+ }
+ }
+
+ #[derive(Deserialize)]
+ #[serde(field_identifier, rename_all = "kebab-case")]
+ #[allow(non_camel_case_types)]
+ enum Field { $($name,)* third_party, }
+
+ struct ConfVisitor;
+
+ impl<'de> Visitor<'de> for ConfVisitor {
+ type Value = TryConf;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ formatter.write_str("Conf")
+ }
+
+ fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error> where V: MapAccess<'de> {
+ let mut errors = Vec::new();
++ let mut warnings = Vec::new();
+ $(let mut $name = None;)*
+ // could get `Field` here directly, but get `str` first for diagnostics
+ while let Some(name) = map.next_key::<&str>()? {
+ match Field::deserialize(name.into_deserializer())? {
+ $(Field::$name => {
- None => $name = Some(value),
++ $(warnings.push(conf_error(format!("deprecated field `{}`. {}", name, $dep)));)?
+ match map.next_value() {
+ Err(e) => errors.push(conf_error(e.to_string())),
+ Ok(value) => match $name {
+ Some(_) => errors.push(conf_error(format!("duplicate field `{}`", name))),
- Ok(TryConf { conf, errors })
++ None => {
++ $name = Some(value);
++ // $new_conf is the same as one of the defined `$name`s, so
++ // this variable is defined in line 2 of this function.
++ $(match $new_conf {
++ Some(_) => errors.push(conf_error(concat!(
++ "duplicate field `", stringify!($new_conf),
++ "` (provided as `", stringify!($name), "`)"
++ ))),
++ None => $new_conf = $name.clone(),
++ })?
++ },
+ }
+ }
+ })*
+ // white-listed; ignore
+ Field::third_party => drop(map.next_value::<IgnoredAny>())
+ }
+ }
+ let conf = Conf { $($name: $name.unwrap_or_else(defaults::$name),)* };
- /// Lint: BLACKLISTED_NAME.
++ Ok(TryConf { conf, errors, warnings })
+ }
+ }
+
+ #[cfg(feature = "internal")]
+ pub mod metadata {
+ use crate::utils::internal_lints::metadata_collector::ClippyConfiguration;
+
+ macro_rules! wrap_option {
+ () => (None);
+ ($x:literal) => (Some($x));
+ }
+
+ pub(crate) fn get_configuration_metadata() -> Vec<ClippyConfiguration> {
+ vec![
+ $(
+ {
+ let deprecation_reason = wrap_option!($($dep)?);
+
+ ClippyConfiguration::new(
+ stringify!($name),
+ stringify!($ty),
+ format!("{:?}", super::defaults::$name()),
+ concat!($($doc, '\n',)*),
+ deprecation_reason,
+ )
+ },
+ )+
+ ]
+ }
+ }
+ };
+}
+
+define_Conf! {
+ /// 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),
- /// 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()),
++ /// DEPRECATED LINT: BLACKLISTED_NAME.
+ ///
- #[conf_deprecated("Please use `cognitive-complexity-threshold` instead")]
- (cyclomatic_complexity_threshold: Option<u64> = None),
++ /// Use the Disallowed Names lint instead
++ #[conf_deprecated("Please use `disallowed-names` instead", disallowed_names)]
++ (blacklisted_names: Vec<String> = Vec::new()),
+ /// Lint: COGNITIVE_COMPLEXITY.
+ ///
+ /// The maximum cognitive complexity a function can have
+ (cognitive_complexity_threshold: u64 = 25),
+ /// DEPRECATED LINT: CYCLOMATIC_COMPLEXITY.
+ ///
+ /// Use the Cognitive Complexity lint instead.
- extend_vec_if_indicator_present(&mut conf.conf.blacklisted_names, DEFAULT_BLACKLISTED_NAMES);
++ #[conf_deprecated("Please use `cognitive-complexity-threshold` instead", cognitive_complexity_threshold)]
++ (cyclomatic_complexity_threshold: u64 = 25),
++ /// Lint: DISALLOWED_NAMES.
++ ///
++ /// The list of disallowed names to lint about. NB: `bar` is not here since it has legitimate uses. The value
++ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
++ /// default configuration of Clippy. By default any configuration will replace the default value.
++ (disallowed_names: Vec<String> = super::DEFAULT_DISALLOWED_NAMES.iter().map(ToString::to_string).collect()),
+ /// Lint: DOC_MARKDOWN.
+ ///
+ /// The list of words this lint should not consider as identifiers needing ticks. The value
+ /// `".."` can be used as part of the list to indicate, that the configured values should be appended to the
+ /// default configuration of Clippy. By default any configuraction will replace the default value. For example:
+ /// * `doc-valid-idents = ["ClipPy"]` would replace the default list with `["ClipPy"]`.
+ /// * `doc-valid-idents = ["ClipPy", ".."]` would append `ClipPy` to the default list.
+ ///
+ /// Default list:
+ (doc_valid_idents: Vec<String> = super::DEFAULT_DOC_VALID_IDENTS.iter().map(ToString::to_string).collect()),
+ /// Lint: TOO_MANY_ARGUMENTS.
+ ///
+ /// The maximum number of argument a function or method can have
+ (too_many_arguments_threshold: u64 = 7),
+ /// Lint: TYPE_COMPLEXITY.
+ ///
+ /// The maximum complexity a type can have
+ (type_complexity_threshold: u64 = 250),
+ /// Lint: MANY_SINGLE_CHAR_NAMES.
+ ///
+ /// The maximum number of single char bindings a scope may have
+ (single_char_binding_names_threshold: u64 = 4),
+ /// Lint: BOXED_LOCAL, USELESS_VEC.
+ ///
+ /// The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
+ (too_large_for_stack: u64 = 200),
+ /// Lint: ENUM_VARIANT_NAMES.
+ ///
+ /// The minimum number of enum variants for the lints about variant names to trigger
+ (enum_variant_name_threshold: u64 = 3),
+ /// Lint: LARGE_ENUM_VARIANT.
+ ///
+ /// The maximum size of an enum's variant to avoid box suggestion
+ (enum_variant_size_threshold: u64 = 200),
+ /// Lint: VERBOSE_BIT_MASK.
+ ///
+ /// The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
+ (verbose_bit_mask_threshold: u64 = 1),
+ /// Lint: DECIMAL_LITERAL_REPRESENTATION.
+ ///
+ /// The lower bound for linting decimal literals
+ (literal_representation_threshold: u64 = 16384),
+ /// Lint: TRIVIALLY_COPY_PASS_BY_REF.
+ ///
+ /// The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
+ (trivial_copy_size_limit: Option<u64> = None),
+ /// Lint: LARGE_TYPE_PASS_BY_MOVE.
+ ///
+ /// The minimum size (in bytes) to consider a type for passing by reference instead of by value.
+ (pass_by_value_size_limit: u64 = 256),
+ /// Lint: TOO_MANY_LINES.
+ ///
+ /// The maximum number of lines a function or method can have
+ (too_many_lines_threshold: u64 = 100),
+ /// Lint: LARGE_STACK_ARRAYS, LARGE_CONST_ARRAYS.
+ ///
+ /// The maximum allowed size for arrays on the stack
+ (array_size_threshold: u64 = 512_000),
+ /// Lint: VEC_BOX.
+ ///
+ /// The size of the boxed type in bytes, where boxing in a `Vec` is allowed
+ (vec_box_size_threshold: u64 = 4096),
+ /// Lint: TYPE_REPETITION_IN_BOUNDS.
+ ///
+ /// The maximum number of bounds a trait can have to be linted
+ (max_trait_bounds: u64 = 3),
+ /// Lint: STRUCT_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool fields a struct can have
+ (max_struct_bools: u64 = 3),
+ /// Lint: FN_PARAMS_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool parameters a function can have
+ (max_fn_params_bools: u64 = 3),
+ /// Lint: WILDCARD_IMPORTS.
+ ///
+ /// Whether to allow certain wildcard imports (prelude, super in tests).
+ (warn_on_all_wildcard_imports: bool = false),
+ /// Lint: DISALLOWED_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.disallowed_names, DEFAULT_DISALLOWED_NAMES);
+
+ conf
+ },
+ Err(e) => TryConf::from_error(e),
+ }
+}
+
+fn extend_vec_if_indicator_present(vec: &mut Vec<String>, default: &[&str]) {
+ if vec.contains(&"..".to_string()) {
+ vec.extend(default.iter().map(ToString::to_string));
+ }
+}
+
+const SEPARATOR_WIDTH: usize = 4;
+
+// Check whether the error is "unknown field" and, if so, list the available fields sorted and at
+// least one per line, more if `CLIPPY_TERMINAL_WIDTH` is set and allows it.
+pub fn format_error(error: Box<dyn Error>) -> String {
+ let s = error.to_string();
+
+ if_chain! {
+ if error.downcast::<toml::de::Error>().is_ok();
+ if let Some((prefix, mut fields, suffix)) = parse_unknown_field_message(&s);
+ then {
+ use fmt::Write;
+
+ fields.sort_unstable();
+
+ let (rows, column_widths) = calculate_dimensions(&fields);
+
+ let mut msg = String::from(prefix);
+ for row in 0..rows {
+ 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
- impl_item_refs
- .iter()
- .find(|iiref| iiref.ident.as_str() == "get_lints")
- .expect("LintPass needs to implement get_lints")
- .id
- .hir_id(),
+use crate::utils::internal_lints::metadata_collector::is_deprecated_lint;
+use clippy_utils::consts::{constant_simple, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::macros::root_macro_call_first_node;
+use clippy_utils::source::snippet;
+use clippy_utils::ty::match_type;
+use clippy_utils::{
+ def_path_res, higher, is_else_clause, is_expn_of, is_expr_path_def_path, is_lint_allowed, match_def_path,
+ method_calls, paths, peel_blocks_with_stmt, SpanlessEq,
+};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_ast::ast::{Crate, ItemKind, LitKind, ModKind, NodeId};
+use rustc_ast::visit::FnKind;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::hir_id::CRATE_HIR_ID;
+use rustc_hir::intravisit::Visitor;
+use rustc_hir::{
+ BinOpKind, Block, Closure, Expr, ExprKind, HirId, Item, Local, MutTy, Mutability, Node, Path, Stmt, StmtKind, Ty,
+ TyKind, UnOp,
+};
+use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::nested_filter;
+use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty::{self, fast_reject::SimplifiedTypeGen, subst::GenericArgKind, FloatTy};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Spanned;
+use rustc_span::symbol::Symbol;
+use rustc_span::{sym, BytePos, Span};
+use rustc_typeck::hir_ty_to_ty;
+
+use std::borrow::{Borrow, Cow};
+
+#[cfg(feature = "internal")]
+pub mod metadata_collector;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for various things we like to keep tidy in clippy.
+ ///
+ /// ### Why is this bad?
+ /// We like to pretend we're an example of tidy code.
+ ///
+ /// ### Example
+ /// Wrong ordering of the util::paths constants.
+ pub CLIPPY_LINTS_INTERNAL,
+ internal,
+ "various things that will negatively affect your clippy experience"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Ensures every lint is associated to a `LintPass`.
+ ///
+ /// ### Why is this bad?
+ /// The compiler only knows lints via a `LintPass`. Without
+ /// putting a lint to a `LintPass::get_lints()`'s return, the compiler will not
+ /// know the name of the lint.
+ ///
+ /// ### Known problems
+ /// Only checks for lints associated using the
+ /// `declare_lint_pass!`, `impl_lint_pass!`, and `lint_array!` macros.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// declare_lint! { pub LINT_1, ... }
+ /// declare_lint! { pub LINT_2, ... }
+ /// declare_lint! { pub FORGOTTEN_LINT, ... }
+ /// // ...
+ /// declare_lint_pass!(Pass => [LINT_1, LINT_2]);
+ /// // missing FORGOTTEN_LINT
+ /// ```
+ pub LINT_WITHOUT_LINT_PASS,
+ internal,
+ "declaring a lint without associating it in a LintPass"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `cx.span_lint*` and suggests to use the `utils::*`
+ /// variant of the function.
+ ///
+ /// ### Why is this bad?
+ /// The `utils::*` variants also add a link to the Clippy documentation to the
+ /// warning/error messages.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// cx.span_lint(LINT_NAME, "message");
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// utils::span_lint(cx, LINT_NAME, "message");
+ /// ```
+ pub COMPILER_LINT_FUNCTIONS,
+ internal,
+ "usage of the lint functions of the compiler instead of the utils::* variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `cx.outer().expn_data()` and suggests to use
+ /// the `cx.outer_expn_data()`
+ ///
+ /// ### Why is this bad?
+ /// `cx.outer_expn_data()` is faster and more concise.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// expr.span.ctxt().outer().expn_data()
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// expr.span.ctxt().outer_expn_data()
+ /// ```
+ pub OUTER_EXPN_EXPN_DATA,
+ internal,
+ "using `cx.outer_expn().expn_data()` instead of `cx.outer_expn_data()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Not an actual lint. This lint is only meant for testing our customized internal compiler
+ /// error message by calling `panic`.
+ ///
+ /// ### Why is this bad?
+ /// ICE in large quantities can damage your teeth
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// 🍦🍦🍦🍦🍦
+ /// ```
+ pub PRODUCE_ICE,
+ internal,
+ "this message should not appear anywhere as we ICE before and don't emit the lint"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for cases of an auto-generated lint without an updated description,
+ /// i.e. `default lint description`.
+ ///
+ /// ### Why is this bad?
+ /// Indicates that the lint is not finished.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// declare_lint! { pub COOL_LINT, nursery, "default lint description" }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// declare_lint! { pub COOL_LINT, nursery, "a great new lint" }
+ /// ```
+ pub DEFAULT_LINT,
+ internal,
+ "found 'default lint description' in a lint declaration"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lints `span_lint_and_then` function calls, where the
+ /// closure argument has only one statement and that statement is a method
+ /// call to `span_suggestion`, `span_help`, `span_note` (using the same
+ /// span), `help` or `note`.
+ ///
+ /// These usages of `span_lint_and_then` should be replaced with one of the
+ /// wrapper functions `span_lint_and_sugg`, span_lint_and_help`, or
+ /// `span_lint_and_note`.
+ ///
+ /// ### Why is this bad?
+ /// Using the wrapper `span_lint_and_*` functions, is more
+ /// convenient, readable and less error prone.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_suggestion(
+ /// expr.span,
+ /// help_msg,
+ /// sugg.to_string(),
+ /// Applicability::MachineApplicable,
+ /// );
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_help(expr.span, help_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.help(help_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_note(expr.span, note_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.note(note_msg);
+ /// });
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// TEST_LINT,
+ /// expr.span,
+ /// lint_msg,
+ /// help_msg,
+ /// sugg.to_string(),
+ /// Applicability::MachineApplicable,
+ /// );
+ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), help_msg);
+ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, None, help_msg);
+ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), note_msg);
+ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, None, note_msg);
+ /// ```
+ pub COLLAPSIBLE_SPAN_LINT_CALLS,
+ internal,
+ "found collapsible `span_lint_and_then` calls"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `utils::match_type()` on a type diagnostic item
+ /// and suggests to use `utils::is_type_diagnostic_item()` instead.
+ ///
+ /// ### Why is this bad?
+ /// `utils::is_type_diagnostic_item()` does not require hardcoded paths.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// utils::match_type(cx, ty, &paths::VEC)
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// utils::is_type_diagnostic_item(cx, ty, sym::Vec)
+ /// ```
+ pub MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ internal,
+ "using `utils::match_type()` instead of `utils::is_type_diagnostic_item()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks the paths module for invalid paths.
+ ///
+ /// ### Why is this bad?
+ /// It indicates a bug in the code.
+ ///
+ /// ### Example
+ /// None.
+ pub INVALID_PATHS,
+ internal,
+ "invalid path"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for interning symbols that have already been pre-interned and defined as constants.
+ ///
+ /// ### Why is this bad?
+ /// It's faster and easier to use the symbol constant.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// let _ = sym!(f32);
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// let _ = sym::f32;
+ /// ```
+ pub INTERNING_DEFINED_SYMBOL,
+ internal,
+ "interning a symbol that is pre-interned and defined as a constant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary conversion from Symbol to a string.
+ ///
+ /// ### Why is this bad?
+ /// It's faster use symbols directly instead of strings.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// symbol.as_str() == "clippy";
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// symbol == sym::clippy;
+ /// ```
+ pub UNNECESSARY_SYMBOL_STR,
+ internal,
+ "unnecessary conversion between Symbol and string"
+}
+
+declare_clippy_lint! {
+ /// Finds unidiomatic usage of `if_chain!`
+ pub IF_CHAIN_STYLE,
+ internal,
+ "non-idiomatic `if_chain!` usage"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for invalid `clippy::version` attributes.
+ ///
+ /// Valid values are:
+ /// * "pre 1.29.0"
+ /// * any valid semantic version
+ pub INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ internal,
+ "found an invalid `clippy::version` attribute"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for declared clippy lints without the `clippy::version` attribute.
+ ///
+ pub MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ internal,
+ "found clippy lint without `clippy::version` attribute"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Check that the `extract_msrv_attr!` macro is used, when a lint has a MSRV.
+ ///
+ pub MISSING_MSRV_ATTR_IMPL,
+ internal,
+ "checking if all necessary steps were taken when adding a MSRV to a lint"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for cases of an auto-generated deprecated lint without an updated reason,
+ /// i.e. `"default deprecation note"`.
+ ///
+ /// ### Why is this bad?
+ /// Indicates that the documentation is incomplete.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// declare_deprecated_lint! {
+ /// /// ### What it does
+ /// /// Nothing. This lint has been deprecated.
+ /// ///
+ /// /// ### Deprecation reason
+ /// /// TODO
+ /// #[clippy::version = "1.63.0"]
+ /// pub COOL_LINT,
+ /// "default deprecation note"
+ /// }
+ /// ```
+ ///
+ /// Use instead:
+ /// ```rust,ignore
+ /// declare_deprecated_lint! {
+ /// /// ### What it does
+ /// /// Nothing. This lint has been deprecated.
+ /// ///
+ /// /// ### Deprecation reason
+ /// /// This lint has been replaced by `cooler_lint`
+ /// #[clippy::version = "1.63.0"]
+ /// pub COOL_LINT,
+ /// "this lint has been replaced by `cooler_lint`"
+ /// }
+ /// ```
+ pub DEFAULT_DEPRECATION_REASON,
+ internal,
+ "found 'default deprecation note' in a deprecated lint declaration"
+}
+
+declare_lint_pass!(ClippyLintsInternal => [CLIPPY_LINTS_INTERNAL]);
+
+impl EarlyLintPass for ClippyLintsInternal {
+ fn check_crate(&mut self, cx: &EarlyContext<'_>, krate: &Crate) {
+ if let Some(utils) = krate.items.iter().find(|item| item.ident.name.as_str() == "utils") {
+ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = utils.kind {
+ if let Some(paths) = items.iter().find(|item| item.ident.name.as_str() == "paths") {
+ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = paths.kind {
+ let mut last_name: Option<&str> = None;
+ for item in items {
+ let name = item.ident.as_str();
+ if let Some(last_name) = last_name {
+ if *last_name > *name {
+ span_lint(
+ cx,
+ CLIPPY_LINTS_INTERNAL,
+ item.span,
+ "this constant should be before the previous constant due to lexical \
+ ordering",
+ );
+ }
+ }
+ last_name = Some(name);
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+#[derive(Clone, Debug, Default)]
+pub struct LintWithoutLintPass {
+ declared_lints: FxHashMap<Symbol, Span>,
+ registered_lints: FxHashSet<Symbol>,
+}
+
+impl_lint_pass!(LintWithoutLintPass => [DEFAULT_LINT, LINT_WITHOUT_LINT_PASS, INVALID_CLIPPY_VERSION_ATTRIBUTE, MISSING_CLIPPY_VERSION_ATTRIBUTE, DEFAULT_DEPRECATION_REASON]);
+
+impl<'tcx> LateLintPass<'tcx> for LintWithoutLintPass {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if is_lint_allowed(cx, DEFAULT_LINT, item.hir_id())
+ || is_lint_allowed(cx, DEFAULT_DEPRECATION_REASON, item.hir_id())
+ {
+ return;
+ }
+
+ if let hir::ItemKind::Static(ty, Mutability::Not, body_id) = item.kind {
+ let is_lint_ref_ty = is_lint_ref_type(cx, ty);
+ if is_deprecated_lint(cx, ty) || is_lint_ref_ty {
+ check_invalid_clippy_version_attribute(cx, item);
+
+ let expr = &cx.tcx.hir().body(body_id).value;
+ let fields;
+ if is_lint_ref_ty {
+ if let ExprKind::AddrOf(_, _, inner_exp) = expr.kind
+ && let ExprKind::Struct(_, struct_fields, _) = inner_exp.kind {
+ fields = struct_fields;
+ } else {
+ return;
+ }
+ } else if let ExprKind::Struct(_, struct_fields, _) = expr.kind {
+ fields = struct_fields;
+ } else {
+ return;
+ }
+
+ let field = fields
+ .iter()
+ .find(|f| f.ident.as_str() == "desc")
+ .expect("lints must have a description field");
+
+ if let ExprKind::Lit(Spanned {
+ node: LitKind::Str(ref sym, _),
+ ..
+ }) = field.expr.kind
+ {
+ let sym_str = sym.as_str();
+ if is_lint_ref_ty {
+ if sym_str == "default lint description" {
+ span_lint(
+ cx,
+ DEFAULT_LINT,
+ item.span,
+ &format!("the lint `{}` has the default lint description", item.ident.name),
+ );
+ }
+
+ self.declared_lints.insert(item.ident.name, item.span);
+ } else if sym_str == "default deprecation note" {
+ span_lint(
+ cx,
+ DEFAULT_DEPRECATION_REASON,
+ item.span,
+ &format!("the lint `{}` has the default deprecation reason", item.ident.name),
+ );
+ }
+ }
+ }
+ } else if let Some(macro_call) = root_macro_call_first_node(cx, item) {
+ if !matches!(
+ cx.tcx.item_name(macro_call.def_id).as_str(),
+ "impl_lint_pass" | "declare_lint_pass"
+ ) {
+ return;
+ }
+ if let hir::ItemKind::Impl(hir::Impl {
+ of_trait: None,
+ items: impl_item_refs,
+ ..
+ }) = item.kind
+ {
+ let mut collector = LintCollector {
+ output: &mut self.registered_lints,
+ cx,
+ };
+ let body_id = cx.tcx.hir().body_owned_by(
- "please use a valid sematic version, see `doc/adding_lints.md`",
++ cx.tcx.hir().local_def_id(
++ impl_item_refs
++ .iter()
++ .find(|iiref| iiref.ident.as_str() == "get_lints")
++ .expect("LintPass needs to implement get_lints")
++ .id
++ .hir_id(),
++ ),
+ );
+ collector.visit_expr(&cx.tcx.hir().body(body_id).value);
+ }
+ }
+ }
+
+ fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
+ if is_lint_allowed(cx, LINT_WITHOUT_LINT_PASS, CRATE_HIR_ID) {
+ return;
+ }
+
+ for (lint_name, &lint_span) in &self.declared_lints {
+ // When using the `declare_tool_lint!` macro, the original `lint_span`'s
+ // file points to "<rustc macros>".
+ // `compiletest-rs` thinks that's an error in a different file and
+ // just ignores it. This causes the test in compile-fail/lint_pass
+ // not able to capture the error.
+ // Therefore, we need to climb the macro expansion tree and find the
+ // actual span that invoked `declare_tool_lint!`:
+ let lint_span = lint_span.ctxt().outer_expn_data().call_site;
+
+ if !self.registered_lints.contains(lint_name) {
+ span_lint(
+ cx,
+ LINT_WITHOUT_LINT_PASS,
+ lint_span,
+ &format!("the lint `{}` is not added to any `LintPass`", lint_name),
+ );
+ }
+ }
+ }
+}
+
+fn is_lint_ref_type<'tcx>(cx: &LateContext<'tcx>, ty: &Ty<'_>) -> bool {
+ if let TyKind::Rptr(
+ _,
+ MutTy {
+ ty: inner,
+ mutbl: Mutability::Not,
+ },
+ ) = ty.kind
+ {
+ if let TyKind::Path(ref path) = inner.kind {
+ if let Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, inner.hir_id) {
+ return match_def_path(cx, def_id, &paths::LINT);
+ }
+ }
+ }
+
+ false
+}
+
+fn check_invalid_clippy_version_attribute(cx: &LateContext<'_>, item: &'_ Item<'_>) {
+ if let Some(value) = extract_clippy_version_value(cx, item) {
+ // The `sym!` macro doesn't work as it only expects a single token.
+ // It's better to keep it this way and have a direct `Symbol::intern` call here.
+ if value == Symbol::intern("pre 1.29.0") {
+ return;
+ }
+
+ if RustcVersion::parse(value.as_str()).is_err() {
+ span_lint_and_help(
+ cx,
+ INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ item.span,
+ "this item has an invalid `clippy::version` attribute",
+ None,
++ "please use a valid semantic version, see `doc/adding_lints.md`",
+ );
+ }
+ } else {
+ span_lint_and_help(
+ cx,
+ MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ item.span,
+ "this lint is missing the `clippy::version` attribute or version value",
+ None,
+ "please use a `clippy::version` attribute, see `doc/adding_lints.md`",
+ );
+ }
+}
+
+/// This function extracts the version value of a `clippy::version` attribute if the given value has
+/// one
+fn extract_clippy_version_value(cx: &LateContext<'_>, item: &'_ Item<'_>) -> Option<Symbol> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ attrs.iter().find_map(|attr| {
+ if_chain! {
+ // Identify attribute
+ if let ast::AttrKind::Normal(ref attr_kind, _) = &attr.kind;
+ if let [tool_name, attr_name] = &attr_kind.path.segments[..];
+ if tool_name.ident.name == sym::clippy;
+ if attr_name.ident.name == sym::version;
+ if let Some(version) = attr.value_str();
+ then {
+ Some(version)
+ } else {
+ None
+ }
+ }
+ })
+}
+
+struct LintCollector<'a, 'tcx> {
+ output: &'a mut FxHashSet<Symbol>,
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for LintCollector<'a, 'tcx> {
+ type NestedFilter = nested_filter::All;
+
+ fn visit_path(&mut self, path: &'tcx Path<'_>, _: HirId) {
+ if path.segments.len() == 1 {
+ self.output.insert(path.segments[0].ident.name);
+ }
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
+
+#[derive(Clone, Default)]
+pub struct CompilerLintFunctions {
+ map: FxHashMap<&'static str, &'static str>,
+}
+
+impl CompilerLintFunctions {
+ #[must_use]
+ pub fn new() -> Self {
+ let mut map = FxHashMap::default();
+ map.insert("span_lint", "utils::span_lint");
+ map.insert("struct_span_lint", "utils::span_lint");
+ map.insert("lint", "utils::span_lint");
+ map.insert("span_lint_note", "utils::span_lint_and_note");
+ map.insert("span_lint_help", "utils::span_lint_and_help");
+ Self { map }
+ }
+}
+
+impl_lint_pass!(CompilerLintFunctions => [COMPILER_LINT_FUNCTIONS]);
+
+impl<'tcx> LateLintPass<'tcx> for CompilerLintFunctions {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if is_lint_allowed(cx, COMPILER_LINT_FUNCTIONS, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, [self_arg, ..], _) = &expr.kind;
+ let fn_name = path.ident;
+ if let Some(sugg) = self.map.get(fn_name.as_str());
+ let ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
+ if match_type(cx, ty, &paths::EARLY_CONTEXT)
+ || match_type(cx, ty, &paths::LATE_CONTEXT);
+ then {
+ span_lint_and_help(
+ cx,
+ COMPILER_LINT_FUNCTIONS,
+ path.ident.span,
+ "usage of a compiler lint function",
+ None,
+ &format!("please use the Clippy variant of this function: `{}`", sugg),
+ );
+ }
+ }
+ }
+}
+
+declare_lint_pass!(OuterExpnDataPass => [OUTER_EXPN_EXPN_DATA]);
+
+impl<'tcx> LateLintPass<'tcx> for OuterExpnDataPass {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, OUTER_EXPN_EXPN_DATA, expr.hir_id) {
+ return;
+ }
+
+ let (method_names, arg_lists, spans) = method_calls(expr, 2);
+ let method_names: Vec<&str> = method_names.iter().map(Symbol::as_str).collect();
+ if_chain! {
+ if let ["expn_data", "outer_expn"] = method_names.as_slice();
+ let args = arg_lists[1];
+ if args.len() == 1;
+ let self_arg = &args[0];
+ let self_ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
+ if match_type(cx, self_ty, &paths::SYNTAX_CONTEXT);
+ then {
+ span_lint_and_sugg(
+ cx,
+ OUTER_EXPN_EXPN_DATA,
+ spans[1].with_hi(expr.span.hi()),
+ "usage of `outer_expn().expn_data()`",
+ "try",
+ "outer_expn_data()".to_string(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+declare_lint_pass!(ProduceIce => [PRODUCE_ICE]);
+
+impl EarlyLintPass for ProduceIce {
+ fn check_fn(&mut self, _: &EarlyContext<'_>, fn_kind: FnKind<'_>, _: Span, _: NodeId) {
+ assert!(!is_trigger_fn(fn_kind), "Would you like some help with that?");
+ }
+}
+
+fn is_trigger_fn(fn_kind: FnKind<'_>) -> bool {
+ match fn_kind {
+ FnKind::Fn(_, ident, ..) => ident.name.as_str() == "it_looks_like_you_are_trying_to_kill_clippy",
+ FnKind::Closure(..) => false,
+ }
+}
+
+declare_lint_pass!(CollapsibleCalls => [COLLAPSIBLE_SPAN_LINT_CALLS]);
+
+impl<'tcx> LateLintPass<'tcx> for CollapsibleCalls {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, COLLAPSIBLE_SPAN_LINT_CALLS, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::Call(func, and_then_args) = expr.kind;
+ if is_expr_path_def_path(cx, func, &["clippy_utils", "diagnostics", "span_lint_and_then"]);
+ if and_then_args.len() == 5;
+ if let ExprKind::Closure(&Closure { body, .. }) = &and_then_args[4].kind;
+ let body = cx.tcx.hir().body(body);
+ let only_expr = peel_blocks_with_stmt(&body.value);
+ if let ExprKind::MethodCall(ps, span_call_args, _) = &only_expr.kind;
+ if let ExprKind::Path(..) = span_call_args[0].kind;
+ then {
+ let and_then_snippets = get_and_then_snippets(cx, and_then_args);
+ let mut sle = SpanlessEq::new(cx).deny_side_effects();
+ match ps.ident.as_str() {
+ "span_suggestion" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ suggest_suggestion(cx, expr, &and_then_snippets, &span_suggestion_snippets(cx, span_call_args));
+ },
+ "span_help" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ let help_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), true);
+ },
+ "span_note" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ let note_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), true);
+ },
+ "help" => {
+ let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
+ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), false);
+ }
+ "note" => {
+ let note_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
+ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), false);
+ }
+ _ => (),
+ }
+ }
+ }
+ }
+}
+
+struct AndThenSnippets<'a> {
+ cx: Cow<'a, str>,
+ lint: Cow<'a, str>,
+ span: Cow<'a, str>,
+ msg: Cow<'a, str>,
+}
+
+fn get_and_then_snippets<'a, 'hir>(cx: &LateContext<'_>, and_then_snippets: &'hir [Expr<'hir>]) -> AndThenSnippets<'a> {
+ let cx_snippet = snippet(cx, and_then_snippets[0].span, "cx");
+ let lint_snippet = snippet(cx, and_then_snippets[1].span, "..");
+ let span_snippet = snippet(cx, and_then_snippets[2].span, "span");
+ let msg_snippet = snippet(cx, and_then_snippets[3].span, r#""...""#);
+
+ AndThenSnippets {
+ cx: cx_snippet,
+ lint: lint_snippet,
+ span: span_snippet,
+ msg: msg_snippet,
+ }
+}
+
+struct SpanSuggestionSnippets<'a> {
+ help: Cow<'a, str>,
+ sugg: Cow<'a, str>,
+ applicability: Cow<'a, str>,
+}
+
+fn span_suggestion_snippets<'a, 'hir>(
+ cx: &LateContext<'_>,
+ span_call_args: &'hir [Expr<'hir>],
+) -> SpanSuggestionSnippets<'a> {
+ let help_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ let sugg_snippet = snippet(cx, span_call_args[3].span, "..");
+ let applicability_snippet = snippet(cx, span_call_args[4].span, "Applicability::MachineApplicable");
+
+ SpanSuggestionSnippets {
+ help: help_snippet,
+ sugg: sugg_snippet,
+ applicability: applicability_snippet,
+ }
+}
+
+fn suggest_suggestion(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ span_suggestion_snippets: &SpanSuggestionSnippets<'_>,
+) {
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collapsible",
+ "collapse into",
+ format!(
+ "span_lint_and_sugg({}, {}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ span_suggestion_snippets.help,
+ span_suggestion_snippets.sugg,
+ span_suggestion_snippets.applicability
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+fn suggest_help(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ help: &str,
+ with_span: bool,
+) {
+ let option_span = if with_span {
+ format!("Some({})", and_then_snippets.span)
+ } else {
+ "None".to_string()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collapsible",
+ "collapse into",
+ format!(
+ "span_lint_and_help({}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ &option_span,
+ help
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+fn suggest_note(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ note: &str,
+ with_span: bool,
+) {
+ let note_span = if with_span {
+ format!("Some({})", and_then_snippets.span)
+ } else {
+ "None".to_string()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collapsible",
+ "collapse into",
+ format!(
+ "span_lint_and_note({}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ note_span,
+ note
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+declare_lint_pass!(MatchTypeOnDiagItem => [MATCH_TYPE_ON_DIAGNOSTIC_ITEM]);
+
+impl<'tcx> LateLintPass<'tcx> for MatchTypeOnDiagItem {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, MATCH_TYPE_ON_DIAGNOSTIC_ITEM, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ // Check if this is a call to utils::match_type()
+ if let ExprKind::Call(fn_path, [context, ty, ty_path]) = expr.kind;
+ if is_expr_path_def_path(cx, fn_path, &["clippy_utils", "ty", "match_type"]);
+ // Extract the path to the matched type
+ if let Some(segments) = path_to_matched_type(cx, ty_path);
+ let segments: Vec<&str> = segments.iter().map(Symbol::as_str).collect();
+ if let Some(ty_did) = def_path_res(cx, &segments[..]).opt_def_id();
+ // Check if the matched type is a diagnostic item
+ if let Some(item_name) = cx.tcx.get_diagnostic_name(ty_did);
+ then {
+ // TODO: check paths constants from external crates.
+ let cx_snippet = snippet(cx, context.span, "_");
+ let ty_snippet = snippet(cx, ty.span, "_");
+
+ span_lint_and_sugg(
+ cx,
+ MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ expr.span,
+ "usage of `clippy_utils::ty::match_type()` on a type diagnostic item",
+ "try",
+ format!("clippy_utils::ty::is_type_diagnostic_item({}, {}, sym::{})", cx_snippet, ty_snippet, item_name),
+ Applicability::MaybeIncorrect,
+ );
+ }
+ }
+ }
+}
+
+fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Vec<Symbol>> {
+ use rustc_hir::ItemKind;
+
+ match &expr.kind {
+ ExprKind::AddrOf(.., expr) => return path_to_matched_type(cx, expr),
+ ExprKind::Path(qpath) => match cx.qpath_res(qpath, expr.hir_id) {
+ Res::Local(hir_id) => {
+ let parent_id = cx.tcx.hir().get_parent_node(hir_id);
+ if let Some(Node::Local(local)) = cx.tcx.hir().find(parent_id) {
+ if let Some(init) = local.init {
+ return path_to_matched_type(cx, init);
+ }
+ }
+ },
+ Res::Def(DefKind::Const | DefKind::Static(..), def_id) => {
+ if let Some(Node::Item(item)) = cx.tcx.hir().get_if_local(def_id) {
+ if let ItemKind::Const(.., body_id) | ItemKind::Static(.., body_id) = item.kind {
+ let body = cx.tcx.hir().body(body_id);
+ return path_to_matched_type(cx, &body.value);
+ }
+ }
+ },
+ _ => {},
+ },
+ ExprKind::Array(exprs) => {
+ let segments: Vec<Symbol> = exprs
+ .iter()
+ .filter_map(|expr| {
+ if let ExprKind::Lit(lit) = &expr.kind {
+ if let LitKind::Str(sym, _) = lit.node {
+ return Some(sym);
+ }
+ }
+
+ None
+ })
+ .collect();
+
+ if segments.len() == exprs.len() {
+ return Some(segments);
+ }
+ },
+ _ => {},
+ }
+
+ None
+}
+
+// This is not a complete resolver for paths. It works on all the paths currently used in the paths
+// module. That's all it does and all it needs to do.
+pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
+ if def_path_res(cx, path) != Res::Err {
+ return true;
+ }
+
+ // Some implementations can't be found by `path_to_res`, particularly inherent
+ // implementations of native types. Check lang items.
+ let path_syms: Vec<_> = path.iter().map(|p| Symbol::intern(p)).collect();
+ let lang_items = cx.tcx.lang_items();
+ // This list isn't complete, but good enough for our current list of paths.
+ let incoherent_impls = [
+ SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F32),
+ SimplifiedTypeGen::FloatSimplifiedType(FloatTy::F64),
+ SimplifiedTypeGen::SliceSimplifiedType,
+ SimplifiedTypeGen::StrSimplifiedType,
+ ]
+ .iter()
+ .flat_map(|&ty| cx.tcx.incoherent_impls(ty));
+ for item_def_id in lang_items.items().iter().flatten().chain(incoherent_impls) {
+ let lang_item_path = cx.get_def_path(*item_def_id);
+ if path_syms.starts_with(&lang_item_path) {
+ if let [item] = &path_syms[lang_item_path.len()..] {
+ if matches!(
+ cx.tcx.def_kind(*item_def_id),
+ DefKind::Mod | DefKind::Enum | DefKind::Trait
+ ) {
+ for child in cx.tcx.module_children(*item_def_id) {
+ if child.ident.name == *item {
+ return true;
+ }
+ }
+ } else {
+ for child in cx.tcx.associated_item_def_ids(*item_def_id) {
+ if cx.tcx.item_name(*child) == *item {
+ return true;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ false
+}
+
+declare_lint_pass!(InvalidPaths => [INVALID_PATHS]);
+
+impl<'tcx> LateLintPass<'tcx> for InvalidPaths {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ let local_def_id = &cx.tcx.parent_module(item.hir_id());
+ let mod_name = &cx.tcx.item_name(local_def_id.to_def_id());
+ if_chain! {
+ if mod_name.as_str() == "paths";
+ if let hir::ItemKind::Const(ty, body_id) = item.kind;
+ let ty = hir_ty_to_ty(cx.tcx, ty);
+ if let ty::Array(el_ty, _) = &ty.kind();
+ if let ty::Ref(_, el_ty, _) = &el_ty.kind();
+ if el_ty.is_str();
+ let body = cx.tcx.hir().body(body_id);
+ let typeck_results = cx.tcx.typeck_body(body_id);
+ if let Some(Constant::Vec(path)) = constant_simple(cx, typeck_results, &body.value);
+ let path: Vec<&str> = path.iter().map(|x| {
+ if let Constant::Str(s) = x {
+ s.as_str()
+ } else {
+ // We checked the type of the constant above
+ unreachable!()
+ }
+ }).collect();
+ if !check_path(cx, &path[..]);
+ then {
+ span_lint(cx, INVALID_PATHS, item.span, "invalid path");
+ }
+ }
+ }
+}
+
+#[derive(Default)]
+pub struct InterningDefinedSymbol {
+ // Maps the symbol value to the constant DefId.
+ symbol_map: FxHashMap<u32, DefId>,
+}
+
+impl_lint_pass!(InterningDefinedSymbol => [INTERNING_DEFINED_SYMBOL, UNNECESSARY_SYMBOL_STR]);
+
+impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
+ fn check_crate(&mut self, cx: &LateContext<'_>) {
+ if !self.symbol_map.is_empty() {
+ return;
+ }
+
+ for &module in &[&paths::KW_MODULE, &paths::SYM_MODULE] {
+ if let Some(def_id) = def_path_res(cx, module).opt_def_id() {
+ for item in cx.tcx.module_children(def_id).iter() {
+ if_chain! {
+ if let Res::Def(DefKind::Const, item_def_id) = item.res;
+ let ty = cx.tcx.type_of(item_def_id);
+ if match_type(cx, ty, &paths::SYMBOL);
+ if let Ok(ConstValue::Scalar(value)) = cx.tcx.const_eval_poly(item_def_id);
+ if let Ok(value) = value.to_u32();
+ then {
+ self.symbol_map.insert(value, item_def_id);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ if let ExprKind::Call(func, [arg]) = &expr.kind;
+ if let ty::FnDef(def_id, _) = cx.typeck_results().expr_ty(func).kind();
+ if match_def_path(cx, *def_id, &paths::SYMBOL_INTERN);
+ if let Some(Constant::Str(arg)) = constant_simple(cx, cx.typeck_results(), arg);
+ let value = Symbol::intern(&arg).as_u32();
+ if let Some(&def_id) = self.symbol_map.get(&value);
+ then {
+ span_lint_and_sugg(
+ cx,
+ INTERNING_DEFINED_SYMBOL,
+ is_expn_of(expr.span, "sym").unwrap_or(expr.span),
+ "interning a defined symbol",
+ "try",
+ cx.tcx.def_path_str(def_id),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ if let ExprKind::Binary(op, left, right) = expr.kind {
+ if matches!(op.node, BinOpKind::Eq | BinOpKind::Ne) {
+ let data = [
+ (left, self.symbol_str_expr(left, cx)),
+ (right, self.symbol_str_expr(right, cx)),
+ ];
+ match data {
+ // both operands are a symbol string
+ [(_, Some(left)), (_, Some(right))] => {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_SYMBOL_STR,
+ expr.span,
+ "unnecessary `Symbol` to string conversion",
+ "try",
+ format!(
+ "{} {} {}",
+ left.as_symbol_snippet(cx),
+ op.node.as_str(),
+ right.as_symbol_snippet(cx),
+ ),
+ Applicability::MachineApplicable,
+ );
+ },
+ // one of the operands is a symbol string
+ [(expr, Some(symbol)), _] | [_, (expr, Some(symbol))] => {
+ // creating an owned string for comparison
+ if matches!(symbol, SymbolStrExpr::Expr { is_to_owned: true, .. }) {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_SYMBOL_STR,
+ expr.span,
+ "unnecessary string allocation",
+ "try",
+ format!("{}.as_str()", symbol.as_symbol_snippet(cx)),
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ // nothing found
+ [(_, None), (_, None)] => {},
+ }
+ }
+ }
+ }
+}
+
+impl InterningDefinedSymbol {
+ fn symbol_str_expr<'tcx>(&self, expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> Option<SymbolStrExpr<'tcx>> {
+ static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR, &paths::TO_STRING_METHOD];
+ static SYMBOL_STR_PATHS: &[&[&str]] = &[
+ &paths::SYMBOL_AS_STR,
+ &paths::SYMBOL_TO_IDENT_STRING,
+ &paths::TO_STRING_METHOD,
+ ];
+ let call = if_chain! {
+ if let ExprKind::AddrOf(_, _, e) = expr.kind;
+ if let ExprKind::Unary(UnOp::Deref, e) = e.kind;
+ then { e } else { expr }
+ };
+ if_chain! {
+ // is a method call
+ if let ExprKind::MethodCall(_, [item], _) = call.kind;
+ if let Some(did) = cx.typeck_results().type_dependent_def_id(call.hir_id);
+ let ty = cx.typeck_results().expr_ty(item);
+ // ...on either an Ident or a Symbol
+ if let Some(is_ident) = if match_type(cx, ty, &paths::SYMBOL) {
+ Some(false)
+ } else if match_type(cx, ty, &paths::IDENT) {
+ Some(true)
+ } else {
+ None
+ };
+ // ...which converts it to a string
+ let paths = if is_ident { IDENT_STR_PATHS } else { SYMBOL_STR_PATHS };
+ if let Some(path) = paths.iter().find(|path| match_def_path(cx, did, path));
+ then {
+ let is_to_owned = path.last().unwrap().ends_with("string");
+ return Some(SymbolStrExpr::Expr {
+ item,
+ is_ident,
+ is_to_owned,
+ });
+ }
+ }
+ // is a string constant
+ if let Some(Constant::Str(s)) = constant_simple(cx, cx.typeck_results(), expr) {
+ let value = Symbol::intern(&s).as_u32();
+ // ...which matches a symbol constant
+ if let Some(&def_id) = self.symbol_map.get(&value) {
+ return Some(SymbolStrExpr::Const(def_id));
+ }
+ }
+ None
+ }
+}
+
+enum SymbolStrExpr<'tcx> {
+ /// a string constant with a corresponding symbol constant
+ Const(DefId),
+ /// a "symbol to string" expression like `symbol.as_str()`
+ Expr {
+ /// part that evaluates to `Symbol` or `Ident`
+ item: &'tcx Expr<'tcx>,
+ is_ident: bool,
+ /// whether an owned `String` is created like `to_ident_string()`
+ is_to_owned: bool,
+ },
+}
+
+impl<'tcx> SymbolStrExpr<'tcx> {
+ /// Returns a snippet that evaluates to a `Symbol` and is const if possible
+ fn as_symbol_snippet(&self, cx: &LateContext<'_>) -> Cow<'tcx, str> {
+ match *self {
+ Self::Const(def_id) => cx.tcx.def_path_str(def_id).into(),
+ Self::Expr { item, is_ident, .. } => {
+ let mut snip = snippet(cx, item.span.source_callsite(), "..");
+ if is_ident {
+ // get `Ident.name`
+ snip.to_mut().push_str(".name");
+ }
+ snip
+ },
+ }
+ }
+}
+
+declare_lint_pass!(IfChainStyle => [IF_CHAIN_STYLE]);
+
+impl<'tcx> LateLintPass<'tcx> for IfChainStyle {
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
+ let (local, after, if_chain_span) = if_chain! {
+ if let [Stmt { kind: StmtKind::Local(local), .. }, after @ ..] = block.stmts;
+ if let Some(if_chain_span) = is_expn_of(block.span, "if_chain");
+ then { (local, after, if_chain_span) } else { return }
+ };
+ if is_first_if_chain_expr(cx, block.hir_id, if_chain_span) {
+ span_lint(
+ cx,
+ IF_CHAIN_STYLE,
+ if_chain_local_span(cx, local, if_chain_span),
+ "`let` expression should be above the `if_chain!`",
+ );
+ } else if local.span.ctxt() == block.span.ctxt() && is_if_chain_then(after, block.expr, if_chain_span) {
+ span_lint(
+ cx,
+ IF_CHAIN_STYLE,
+ if_chain_local_span(cx, local, if_chain_span),
+ "`let` expression should be inside `then { .. }`",
+ );
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ let (cond, then, els) = if let Some(higher::IfOrIfLet { cond, r#else, then }) = higher::IfOrIfLet::hir(expr) {
+ (cond, then, r#else.is_some())
+ } else {
+ return;
+ };
+ let then_block = match then.kind {
+ ExprKind::Block(block, _) => block,
+ _ => return,
+ };
+ let if_chain_span = is_expn_of(expr.span, "if_chain");
+ if !els {
+ check_nested_if_chains(cx, expr, then_block, if_chain_span);
+ }
+ let if_chain_span = match if_chain_span {
+ None => return,
+ Some(span) => span,
+ };
+ // check for `if a && b;`
+ if_chain! {
+ if let ExprKind::Binary(op, _, _) = cond.kind;
+ if op.node == BinOpKind::And;
+ if cx.sess().source_map().is_multiline(cond.span);
+ then {
+ span_lint(cx, IF_CHAIN_STYLE, cond.span, "`if a && b;` should be `if a; if b;`");
+ }
+ }
+ if is_first_if_chain_expr(cx, expr.hir_id, if_chain_span)
+ && is_if_chain_then(then_block.stmts, then_block.expr, if_chain_span)
+ {
+ span_lint(cx, IF_CHAIN_STYLE, expr.span, "`if_chain!` only has one `if`");
+ }
+ }
+}
+
+fn check_nested_if_chains(
+ cx: &LateContext<'_>,
+ if_expr: &Expr<'_>,
+ then_block: &Block<'_>,
+ if_chain_span: Option<Span>,
+) {
+ #[rustfmt::skip]
+ let (head, tail) = match *then_block {
+ Block { stmts, expr: Some(tail), .. } => (stmts, tail),
+ Block {
+ stmts: &[
+ ref head @ ..,
+ Stmt { kind: StmtKind::Expr(tail) | StmtKind::Semi(tail), .. }
+ ],
+ ..
+ } => (head, tail),
+ _ => return,
+ };
+ if_chain! {
+ if let Some(higher::IfOrIfLet { r#else: None, .. }) = higher::IfOrIfLet::hir(tail);
+ let sm = cx.sess().source_map();
+ if head
+ .iter()
+ .all(|stmt| matches!(stmt.kind, StmtKind::Local(..)) && !sm.is_multiline(stmt.span));
+ if if_chain_span.is_some() || !is_else_clause(cx.tcx, if_expr);
+ then {} else { return }
+ }
+ let (span, msg) = match (if_chain_span, is_expn_of(tail.span, "if_chain")) {
+ (None, Some(_)) => (if_expr.span, "this `if` can be part of the inner `if_chain!`"),
+ (Some(_), None) => (tail.span, "this `if` can be part of the outer `if_chain!`"),
+ (Some(a), Some(b)) if a != b => (b, "this `if_chain!` can be merged with the outer `if_chain!`"),
+ _ => return,
+ };
+ span_lint_and_then(cx, IF_CHAIN_STYLE, span, msg, |diag| {
+ let (span, msg) = match head {
+ [] => return,
+ [stmt] => (stmt.span, "this `let` statement can also be in the `if_chain!`"),
+ [a, .., b] => (
+ a.span.to(b.span),
+ "these `let` statements can also be in the `if_chain!`",
+ ),
+ };
+ diag.span_help(span, msg);
+ });
+}
+
+fn is_first_if_chain_expr(cx: &LateContext<'_>, hir_id: HirId, if_chain_span: Span) -> bool {
+ cx.tcx
+ .hir()
+ .parent_iter(hir_id)
+ .find(|(_, node)| {
+ #[rustfmt::skip]
+ !matches!(node, Node::Expr(Expr { kind: ExprKind::Block(..), .. }) | Node::Stmt(_))
+ })
+ .map_or(false, |(id, _)| {
+ is_expn_of(cx.tcx.hir().span(id), "if_chain") != Some(if_chain_span)
+ })
+}
+
+/// Checks a trailing slice of statements and expression of a `Block` to see if they are part
+/// of the `then {..}` portion of an `if_chain!`
+fn is_if_chain_then(stmts: &[Stmt<'_>], expr: Option<&Expr<'_>>, if_chain_span: Span) -> bool {
+ let span = if let [stmt, ..] = stmts {
+ stmt.span
+ } else if let Some(expr) = expr {
+ expr.span
+ } else {
+ // empty `then {}`
+ return true;
+ };
+ is_expn_of(span, "if_chain").map_or(true, |span| span != if_chain_span)
+}
+
+/// Creates a `Span` for `let x = ..;` in an `if_chain!` call.
+fn if_chain_local_span(cx: &LateContext<'_>, local: &Local<'_>, if_chain_span: Span) -> Span {
+ let mut span = local.pat.span;
+ if let Some(init) = local.init {
+ span = span.to(init.span);
+ }
+ span.adjust(if_chain_span.ctxt().outer_expn());
+ let sm = cx.sess().source_map();
+ let span = sm.span_extend_to_prev_str(span, "let", false, true).unwrap_or(span);
+ let span = sm.span_extend_to_next_char(span, ';', false);
+ Span::new(
+ span.lo() - BytePos(3),
+ span.hi() + BytePos(1),
+ span.ctxt(),
+ span.parent(),
+ )
+}
+
+declare_lint_pass!(MsrvAttrImpl => [MISSING_MSRV_ATTR_IMPL]);
+
+impl LateLintPass<'_> for MsrvAttrImpl {
+ fn check_item(&mut self, cx: &LateContext<'_>, item: &hir::Item<'_>) {
+ if_chain! {
+ if let hir::ItemKind::Impl(hir::Impl {
+ of_trait: Some(lint_pass_trait_ref),
+ self_ty,
+ items,
+ ..
+ }) = &item.kind;
+ if let Some(lint_pass_trait_def_id) = lint_pass_trait_ref.trait_def_id();
+ let is_late_pass = match_def_path(cx, lint_pass_trait_def_id, &paths::LATE_LINT_PASS);
+ if is_late_pass || match_def_path(cx, lint_pass_trait_def_id, &paths::EARLY_LINT_PASS);
+ let self_ty = hir_ty_to_ty(cx.tcx, self_ty);
+ if let ty::Adt(self_ty_def, _) = self_ty.kind();
+ if self_ty_def.is_struct();
+ if self_ty_def.all_fields().any(|f| {
+ cx.tcx
+ .type_of(f.did)
+ .walk()
+ .filter(|t| matches!(t.unpack(), GenericArgKind::Type(_)))
+ .any(|t| match_type(cx, t.expect_ty(), &paths::RUSTC_VERSION))
+ });
+ if !items.iter().any(|item| item.ident.name == sym!(enter_lint_attrs));
+ then {
+ let context = if is_late_pass { "LateContext" } else { "EarlyContext" };
+ let lint_pass = if is_late_pass { "LateLintPass" } else { "EarlyLintPass" };
+ let span = cx.sess().source_map().span_through_char(item.span, '{');
+ span_lint_and_sugg(
+ cx,
+ MISSING_MSRV_ATTR_IMPL,
+ span,
+ &format!("`extract_msrv_attr!` macro missing from `{lint_pass}` implementation"),
+ &format!("add `extract_msrv_attr!({context})` to the `{lint_pass}` implementation"),
+ format!("{}\n extract_msrv_attr!({context});", snippet(cx, span, "..")),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
--- /dev/null
- // blacklist check
+//! This lint is used to collect metadata about clippy lints. This metadata is exported as a json
+//! file and then used to generate the [clippy lint list](https://rust-lang.github.io/rust-clippy/master/index.html)
+//!
+//! This module and therefore the entire lint is guarded by a feature flag called `internal`
+//!
+//! The module transforms all lint names to ascii lowercase to ensure that we don't have mismatches
+//! during any comparison or mapping. (Please take care of this, it's not fun to spend time on such
+//! a simple mistake)
+
+use crate::renamed_lints::RENAMED_LINTS;
+use crate::utils::internal_lints::{extract_clippy_version_value, is_lint_ref_type};
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::{match_type, walk_ptrs_ty_depth};
+use clippy_utils::{last_path_segment, match_def_path, match_function_call, match_path, paths};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::{
+ self as hir, def::DefKind, intravisit, intravisit::Visitor, Closure, ExprKind, Item, ItemKind, Mutability, QPath,
+};
+use rustc_lint::{CheckLintNameResult, LateContext, LateLintPass, LintContext, LintId};
+use rustc_middle::hir::nested_filter;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Loc, Span, Symbol};
+use serde::{ser::SerializeStruct, Serialize, Serializer};
+use std::collections::BinaryHeap;
+use std::fmt;
+use std::fmt::Write as _;
+use std::fs::{self, OpenOptions};
+use std::io::prelude::*;
+use std::path::Path;
+use std::path::PathBuf;
+use std::process::Command;
+
+/// This is the output file of the lint collector.
+const OUTPUT_FILE: &str = "../util/gh-pages/lints.json";
+/// These lints are excluded from the export.
+const BLACK_LISTED_LINTS: &[&str] = &["lint_author", "dump_hir", "internal_metadata_collector"];
+/// These groups will be ignored by the lint group matcher. This is useful for collections like
+/// `clippy::all`
+const IGNORED_LINT_GROUPS: [&str; 1] = ["clippy::all"];
+/// Lints within this group will be excluded from the collection. These groups
+/// have to be defined without the `clippy::` prefix.
+const EXCLUDED_LINT_GROUPS: [&str; 1] = ["internal"];
+/// Collected deprecated lint will be assigned to this group in the JSON output
+const DEPRECATED_LINT_GROUP_STR: &str = "deprecated";
+/// This is the lint level for deprecated lints that will be displayed in the lint list
+const DEPRECATED_LINT_LEVEL: &str = "none";
+/// This array holds Clippy's lint groups with their corresponding default lint level. The
+/// lint level for deprecated lints is set in `DEPRECATED_LINT_LEVEL`.
+const DEFAULT_LINT_LEVELS: &[(&str, &str)] = &[
+ ("correctness", "deny"),
+ ("suspicious", "warn"),
+ ("restriction", "allow"),
+ ("style", "warn"),
+ ("pedantic", "allow"),
+ ("complexity", "warn"),
+ ("perf", "warn"),
+ ("cargo", "allow"),
+ ("nursery", "allow"),
+];
+/// This prefix is in front of the lint groups in the lint store. The prefix will be trimmed
+/// to only keep the actual lint group in the output.
+const CLIPPY_LINT_GROUP_PREFIX: &str = "clippy::";
+
+/// This template will be used to format the configuration section in the lint documentation.
+/// The `configurations` parameter will be replaced with one or multiple formatted
+/// `ClippyConfiguration` instances. See `CONFIGURATION_VALUE_TEMPLATE` for further customizations
+macro_rules! CONFIGURATION_SECTION_TEMPLATE {
+ () => {
+ r#"
+### Configuration
+This lint has the following configuration variables:
+
+{configurations}
+"#
+ };
+}
+/// This template will be used to format an individual `ClippyConfiguration` instance in the
+/// lint documentation.
+///
+/// The format function will provide strings for the following parameters: `name`, `ty`, `doc` and
+/// `default`
+macro_rules! CONFIGURATION_VALUE_TEMPLATE {
+ () => {
+ "* `{name}`: `{ty}`: {doc} (defaults to `{default}`)\n"
+ };
+}
+
+macro_rules! RENAMES_SECTION_TEMPLATE {
+ () => {
+ r#"
+### Past names
+
+{names}
+"#
+ };
+}
+macro_rules! RENAME_VALUE_TEMPLATE {
+ () => {
+ "* `{name}`\n"
+ };
+}
+
+const LINT_EMISSION_FUNCTIONS: [&[&str]; 7] = [
+ &["clippy_utils", "diagnostics", "span_lint"],
+ &["clippy_utils", "diagnostics", "span_lint_and_help"],
+ &["clippy_utils", "diagnostics", "span_lint_and_note"],
+ &["clippy_utils", "diagnostics", "span_lint_hir"],
+ &["clippy_utils", "diagnostics", "span_lint_and_sugg"],
+ &["clippy_utils", "diagnostics", "span_lint_and_then"],
+ &["clippy_utils", "diagnostics", "span_lint_hir_and_then"],
+];
+const SUGGESTION_DIAGNOSTIC_BUILDER_METHODS: [(&str, bool); 9] = [
+ ("span_suggestion", false),
+ ("span_suggestion_short", false),
+ ("span_suggestion_verbose", false),
+ ("span_suggestion_hidden", false),
+ ("tool_only_span_suggestion", false),
+ ("multipart_suggestion", true),
+ ("multipart_suggestions", true),
+ ("tool_only_multipart_suggestion", true),
+ ("span_suggestions", true),
+];
+const SUGGESTION_FUNCTIONS: [&[&str]; 2] = [
+ &["clippy_utils", "diagnostics", "multispan_sugg"],
+ &["clippy_utils", "diagnostics", "multispan_sugg_with_applicability"],
+];
+const DEPRECATED_LINT_TYPE: [&str; 3] = ["clippy_lints", "deprecated_lints", "ClippyDeprecatedLint"];
+
+/// The index of the applicability name of `paths::APPLICABILITY_VALUES`
+const APPLICABILITY_NAME_INDEX: usize = 2;
+/// This applicability will be set for unresolved applicability values.
+const APPLICABILITY_UNRESOLVED_STR: &str = "Unresolved";
+/// The version that will be displayed if none has been defined
+const VERSION_DEFAULT_STR: &str = "Unknown";
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Collects metadata about clippy lints for the website.
+ ///
+ /// This lint will be used to report problems of syntax parsing. You should hopefully never
+ /// see this but never say never I guess ^^
+ ///
+ /// ### Why is this bad?
+ /// This is not a bad thing but definitely a hacky way to do it. See
+ /// issue [#4310](https://github.com/rust-lang/rust-clippy/issues/4310) for a discussion
+ /// about the implementation.
+ ///
+ /// ### Known problems
+ /// Hopefully none. It would be pretty uncool to have a problem here :)
+ ///
+ /// ### Example output
+ /// ```json,ignore
+ /// {
+ /// "id": "internal_metadata_collector",
+ /// "id_span": {
+ /// "path": "clippy_lints/src/utils/internal_lints/metadata_collector.rs",
+ /// "line": 1
+ /// },
+ /// "group": "clippy::internal",
+ /// "docs": " ### What it does\nCollects metadata about clippy lints for the website. [...] "
+ /// }
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub INTERNAL_METADATA_COLLECTOR,
+ internal_warn,
+ "A busy bee collection metadata about lints"
+}
+
+impl_lint_pass!(MetadataCollector => [INTERNAL_METADATA_COLLECTOR]);
+
+#[allow(clippy::module_name_repetitions)]
+#[derive(Debug, Clone)]
+pub struct MetadataCollector {
+ /// All collected lints
+ ///
+ /// We use a Heap here to have the lints added in alphabetic order in the export
+ lints: BinaryHeap<LintMetadata>,
+ applicability_info: FxHashMap<String, ApplicabilityInfo>,
+ config: Vec<ClippyConfiguration>,
+ clippy_project_root: PathBuf,
+}
+
+impl MetadataCollector {
+ pub fn new() -> Self {
+ Self {
+ lints: BinaryHeap::<LintMetadata>::default(),
+ applicability_info: FxHashMap::<String, ApplicabilityInfo>::default(),
+ config: collect_configs(),
+ clippy_project_root: std::env::current_dir()
+ .expect("failed to get current dir")
+ .ancestors()
+ .nth(1)
+ .expect("failed to get project root")
+ .to_path_buf(),
+ }
+ }
+
+ fn get_lint_configs(&self, lint_name: &str) -> Option<String> {
+ self.config
+ .iter()
+ .filter(|config| config.lints.iter().any(|lint| lint == lint_name))
+ .map(ToString::to_string)
+ .reduce(|acc, x| acc + &x)
+ .map(|configurations| format!(CONFIGURATION_SECTION_TEMPLATE!(), configurations = configurations))
+ }
+}
+
+impl Drop for MetadataCollector {
+ /// You might ask: How hacky is this?
+ /// My answer: YES
+ fn drop(&mut self) {
+ // The metadata collector gets dropped twice, this makes sure that we only write
+ // when the list is full
+ if self.lints.is_empty() {
+ return;
+ }
+
+ let mut applicability_info = std::mem::take(&mut self.applicability_info);
+
+ // Mapping the final data
+ let mut lints = std::mem::take(&mut self.lints).into_sorted_vec();
+ for x in &mut lints {
+ x.applicability = Some(applicability_info.remove(&x.id).unwrap_or_default());
+ replace_produces(&x.id, &mut x.docs, &self.clippy_project_root);
+ }
+
+ collect_renames(&mut lints);
+
+ // Outputting
+ if Path::new(OUTPUT_FILE).exists() {
+ fs::remove_file(OUTPUT_FILE).unwrap();
+ }
+ let mut file = OpenOptions::new().write(true).create(true).open(OUTPUT_FILE).unwrap();
+ writeln!(file, "{}", serde_json::to_string_pretty(&lints).unwrap()).unwrap();
+ }
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct LintMetadata {
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: String,
+ docs: String,
+ version: String,
+ /// This field is only used in the output and will only be
+ /// mapped shortly before the actual output.
+ applicability: Option<ApplicabilityInfo>,
+}
+
+impl LintMetadata {
+ fn new(
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: &'static str,
+ version: String,
+ docs: String,
+ ) -> Self {
+ Self {
+ id,
+ id_span,
+ group,
+ level: level.to_string(),
+ version,
+ docs,
+ applicability: None,
+ }
+ }
+}
+
+fn replace_produces(lint_name: &str, docs: &mut String, clippy_project_root: &Path) {
+ let mut doc_lines = docs.lines().map(ToString::to_string).collect::<Vec<_>>();
+ let mut lines = doc_lines.iter_mut();
+
+ 'outer: loop {
+ // Find the start of the example
+
+ // ```rust
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start().starts_with("```rust") => {
+ if line.contains("ignore") || line.contains("no_run") {
+ // A {{produces}} marker may have been put on a ignored code block by mistake,
+ // just seek to the end of the code block and continue checking.
+ if lines.any(|line| line.trim_start().starts_with("```")) {
+ continue;
+ }
+
+ panic!("lint `{}` has an unterminated code block", lint_name)
+ }
+
+ break;
+ },
+ Some(line) if line.trim_start() == "{{produces}}" => {
+ panic!(
+ "lint `{}` has marker {{{{produces}}}} with an ignored or missing code block",
+ lint_name
+ )
+ },
+ Some(line) => {
+ let line = line.trim();
+ // These are the two most common markers of the corrections section
+ if line.eq_ignore_ascii_case("Use instead:") || line.eq_ignore_ascii_case("Could be written as:") {
+ break 'outer;
+ }
+ },
+ None => break 'outer,
+ }
+ }
+
+ // Collect the example
+ let mut example = Vec::new();
+ loop {
+ match lines.next() {
+ Some(line) if line.trim_start() == "```" => break,
+ Some(line) => example.push(line),
+ None => panic!("lint `{}` has an unterminated code block", lint_name),
+ }
+ }
+
+ // Find the {{produces}} and attempt to generate the output
+ loop {
+ match lines.next() {
+ Some(line) if line.is_empty() => {},
+ Some(line) if line.trim() == "{{produces}}" => {
+ let output = get_lint_output(lint_name, &example, clippy_project_root);
+ line.replace_range(
+ ..,
+ &format!(
+ "<details>\
+ <summary>Produces</summary>\n\
+ \n\
+ ```text\n\
+ {}\n\
+ ```\n\
+ </details>",
+ output
+ ),
+ );
+
+ break;
+ },
+ // No {{produces}}, we can move on to the next example
+ Some(_) => break,
+ None => break 'outer,
+ }
+ }
+ }
+
+ *docs = cleanup_docs(&doc_lines);
+}
+
+fn get_lint_output(lint_name: &str, example: &[&mut String], clippy_project_root: &Path) -> String {
+ let dir = tempfile::tempdir().unwrap_or_else(|e| panic!("failed to create temp dir: {e}"));
+ let file = dir.path().join("lint_example.rs");
+
+ let mut source = String::new();
+ let unhidden = example
+ .iter()
+ .map(|line| line.trim_start().strip_prefix("# ").unwrap_or(line));
+
+ // Get any attributes
+ let mut lines = unhidden.peekable();
+ while let Some(line) = lines.peek() {
+ if line.starts_with("#!") {
+ source.push_str(line);
+ source.push('\n');
+ lines.next();
+ } else {
+ break;
+ }
+ }
+
+ let needs_main = !example.iter().any(|line| line.contains("fn main"));
+ if needs_main {
+ source.push_str("fn main() {\n");
+ }
+
+ for line in lines {
+ source.push_str(line);
+ source.push('\n');
+ }
+
+ if needs_main {
+ source.push_str("}\n");
+ }
+
+ if let Err(e) = fs::write(&file, &source) {
+ panic!("failed to write to `{}`: {e}", file.as_path().to_string_lossy());
+ }
+
+ let prefixed_name = format!("{}{lint_name}", CLIPPY_LINT_GROUP_PREFIX);
+
+ let mut cmd = Command::new("cargo");
+
+ cmd.current_dir(clippy_project_root)
+ .env("CARGO_INCREMENTAL", "0")
+ .env("CLIPPY_ARGS", "")
+ .env("CLIPPY_DISABLE_DOCS_LINKS", "1")
+ // We need to disable this to enable all lints
+ .env("ENABLE_METADATA_COLLECTION", "0")
+ .args(["run", "--bin", "clippy-driver"])
+ .args(["--target-dir", "./clippy_lints/target"])
+ .args(["--", "--error-format=json"])
+ .args(["--edition", "2021"])
+ .arg("-Cdebuginfo=0")
+ .args(["-A", "clippy::all"])
+ .args(["-W", &prefixed_name])
+ .args(["-L", "./target/debug"])
+ .args(["-Z", "no-codegen"]);
+
+ let output = cmd
+ .arg(file.as_path())
+ .output()
+ .unwrap_or_else(|e| panic!("failed to run `{:?}`: {e}", cmd));
+
+ let tmp_file_path = file.to_string_lossy();
+ let stderr = std::str::from_utf8(&output.stderr).unwrap();
+ let msgs = stderr
+ .lines()
+ .filter(|line| line.starts_with('{'))
+ .map(|line| serde_json::from_str(line).unwrap())
+ .collect::<Vec<serde_json::Value>>();
+
+ let mut rendered = String::new();
+ let iter = msgs
+ .iter()
+ .filter(|msg| matches!(&msg["code"]["code"], serde_json::Value::String(s) if s == &prefixed_name));
+
+ for message in iter {
+ let rendered_part = message["rendered"].as_str().expect("rendered field should exist");
+ rendered.push_str(rendered_part);
+ }
+
+ if rendered.is_empty() {
+ let rendered: Vec<&str> = msgs.iter().filter_map(|msg| msg["rendered"].as_str()).collect();
+ let non_json: Vec<&str> = stderr.lines().filter(|line| !line.starts_with('{')).collect();
+ panic!(
+ "did not find lint `{}` in output of example, got:\n{}\n{}",
+ lint_name,
+ non_json.join("\n"),
+ rendered.join("\n")
+ );
+ }
+
+ // The reader doesn't need to see `/tmp/.tmpfiy2Qd/lint_example.rs` :)
+ rendered.trim_end().replace(&*tmp_file_path, "lint_example.rs")
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct SerializableSpan {
+ path: String,
+ line: usize,
+}
+
+impl fmt::Display for SerializableSpan {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}:{}", self.path.rsplit('/').next().unwrap_or_default(), self.line)
+ }
+}
+
+impl SerializableSpan {
+ fn from_item(cx: &LateContext<'_>, item: &Item<'_>) -> Self {
+ Self::from_span(cx, item.ident.span)
+ }
+
+ fn from_span(cx: &LateContext<'_>, span: Span) -> Self {
+ let loc: Loc = cx.sess().source_map().lookup_char_pos(span.lo());
+
+ Self {
+ path: format!("{}", loc.file.name.prefer_remapped()),
+ line: loc.line,
+ }
+ }
+}
+
+#[derive(Debug, Clone, Default, PartialEq, Eq, PartialOrd, Ord)]
+struct ApplicabilityInfo {
+ /// Indicates if any of the lint emissions uses multiple spans. This is related to
+ /// [rustfix#141](https://github.com/rust-lang/rustfix/issues/141) as such suggestions can
+ /// currently not be applied automatically.
+ is_multi_part_suggestion: bool,
+ applicability: Option<usize>,
+}
+
+impl Serialize for ApplicabilityInfo {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: Serializer,
+ {
+ let mut s = serializer.serialize_struct("ApplicabilityInfo", 2)?;
+ s.serialize_field("is_multi_part_suggestion", &self.is_multi_part_suggestion)?;
+ if let Some(index) = self.applicability {
+ s.serialize_field(
+ "applicability",
+ &paths::APPLICABILITY_VALUES[index][APPLICABILITY_NAME_INDEX],
+ )?;
+ } else {
+ s.serialize_field("applicability", APPLICABILITY_UNRESOLVED_STR)?;
+ }
+ s.end()
+ }
+}
+
+// ==================================================================
+// Configuration
+// ==================================================================
+#[derive(Debug, Clone, Default)]
+pub struct ClippyConfiguration {
+ name: String,
+ config_type: &'static str,
+ default: String,
+ lints: Vec<String>,
+ doc: String,
+ #[allow(dead_code)]
+ deprecation_reason: Option<&'static str>,
+}
+
+impl ClippyConfiguration {
+ pub fn new(
+ name: &'static str,
+ config_type: &'static str,
+ default: String,
+ doc_comment: &'static str,
+ deprecation_reason: Option<&'static str>,
+ ) -> Self {
+ let (lints, doc) = parse_config_field_doc(doc_comment)
+ .unwrap_or_else(|| (vec![], "[ERROR] MALFORMED DOC COMMENT".to_string()));
+
+ Self {
+ name: to_kebab(name),
+ lints,
+ doc,
+ config_type,
+ default,
+ deprecation_reason,
+ }
+ }
+}
+
+fn collect_configs() -> Vec<ClippyConfiguration> {
+ crate::utils::conf::metadata::get_configuration_metadata()
+}
+
+/// This parses the field documentation of the config struct.
+///
+/// ```rust, ignore
+/// parse_config_field_doc(cx, "Lint: LINT_NAME_1, LINT_NAME_2. Papa penguin, papa penguin")
+/// ```
+///
+/// Would yield:
+/// ```rust, ignore
+/// Some(["lint_name_1", "lint_name_2"], "Papa penguin, papa penguin")
+/// ```
+fn parse_config_field_doc(doc_comment: &str) -> Option<(Vec<String>, String)> {
+ const DOC_START: &str = " Lint: ";
+ if_chain! {
+ if doc_comment.starts_with(DOC_START);
+ if let Some(split_pos) = doc_comment.find('.');
+ then {
+ let mut doc_comment = doc_comment.to_string();
+ let mut documentation = doc_comment.split_off(split_pos);
+
+ // Extract lints
+ doc_comment.make_ascii_lowercase();
+ let lints: Vec<String> = doc_comment.split_off(DOC_START.len()).split(", ").map(str::to_string).collect();
+
+ // Format documentation correctly
+ // split off leading `.` from lint name list and indent for correct formatting
+ documentation = documentation.trim_start_matches('.').trim().replace("\n ", "\n ");
+
+ Some((lints, documentation))
+ } else {
+ None
+ }
+ }
+}
+
+/// Transforms a given `snake_case_string` to a tasty `kebab-case-string`
+fn to_kebab(config_name: &str) -> String {
+ config_name.replace('_', "-")
+}
+
+impl fmt::Display for ClippyConfiguration {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
+ write!(
+ f,
+ CONFIGURATION_VALUE_TEMPLATE!(),
+ name = self.name,
+ ty = self.config_type,
+ doc = self.doc,
+ default = self.default
+ )
+ }
+}
+
+// ==================================================================
+// Lint pass
+// ==================================================================
+impl<'hir> LateLintPass<'hir> for MetadataCollector {
+ /// Collecting lint declarations like:
+ /// ```rust, ignore
+ /// declare_clippy_lint! {
+ /// /// ### What it does
+ /// /// Something IDK.
+ /// pub SOME_LINT,
+ /// internal,
+ /// "Who am I?"
+ /// }
+ /// ```
+ fn check_item(&mut self, cx: &LateContext<'hir>, item: &'hir Item<'_>) {
+ if let ItemKind::Static(ty, Mutability::Not, _) = item.kind {
+ // Normal lint
+ if_chain! {
+ // item validation
+ if is_lint_ref_type(cx, ty);
- // blacklist check
++ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // metadata extraction
+ if let Some((group, level)) = get_lint_group_and_level_or_lint(cx, &lint_name, item);
+ if let Some(mut raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ if let Some(configuration_section) = self.get_lint_configs(&lint_name) {
+ raw_docs.push_str(&configuration_section);
+ }
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ group,
+ level,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+
+ if_chain! {
+ if is_deprecated_lint(cx, ty);
++ // disallow check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // Metadata the little we can get from a deprecated lint
+ if let Some(raw_docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ DEPRECATED_LINT_GROUP_STR.to_string(),
+ DEPRECATED_LINT_LEVEL,
+ version,
+ raw_docs,
+ ));
+ }
+ }
+ }
+ }
+
+ /// Collecting constant applicability from the actual lint emissions
+ ///
+ /// Example:
+ /// ```rust, ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// SOME_LINT,
+ /// item.span,
+ /// "Le lint message",
+ /// "Here comes help:",
+ /// "#![allow(clippy::all)]",
+ /// Applicability::MachineApplicable, // <-- Extracts this constant value
+ /// );
+ /// ```
+ fn check_expr(&mut self, cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) {
+ if let Some(args) = match_lint_emission(cx, expr) {
+ let emission_info = extract_emission_info(cx, args);
+ if emission_info.is_empty() {
+ // See:
+ // - src/misc.rs:734:9
+ // - src/methods/mod.rs:3545:13
+ // - src/methods/mod.rs:3496:13
+ // We are basically unable to resolve the lint name itself.
+ return;
+ }
+
+ for (lint_name, applicability, is_multi_part) in emission_info {
+ let app_info = self.applicability_info.entry(lint_name).or_default();
+ app_info.applicability = applicability;
+ app_info.is_multi_part_suggestion = is_multi_part;
+ }
+ }
+ }
+}
+
+// ==================================================================
+// Lint definition extraction
+// ==================================================================
+fn sym_to_string(sym: Symbol) -> String {
+ sym.as_str().to_string()
+}
+
+fn extract_attr_docs_or_lint(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ extract_attr_docs(cx, item).or_else(|| {
+ lint_collection_error_item(cx, item, "could not collect the lint documentation");
+ None
+ })
+}
+
+/// This function collects all documentation that has been added to an item using
+/// `#[doc = r""]` attributes. Several attributes are aggravated using line breaks
+///
+/// ```ignore
+/// #[doc = r"Hello world!"]
+/// #[doc = r"=^.^="]
+/// struct SomeItem {}
+/// ```
+///
+/// Would result in `Hello world!\n=^.^=\n`
+fn extract_attr_docs(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let mut lines = attrs.iter().filter_map(ast::Attribute::doc_str);
+
+ if let Some(line) = lines.next() {
+ let raw_docs = lines.fold(String::from(line.as_str()) + "\n", |s, line| s + line.as_str() + "\n");
+ return Some(raw_docs);
+ }
+
+ None
+}
+
+/// This function may modify the doc comment to ensure that the string can be displayed using a
+/// markdown viewer in Clippy's lint list. The following modifications could be applied:
+/// * Removal of leading space after a new line. (Important to display tables)
+/// * Ensures that code blocks only contain language information
+fn cleanup_docs(docs_collection: &Vec<String>) -> String {
+ let mut in_code_block = false;
+ let mut is_code_block_rust = false;
+
+ let mut docs = String::new();
+ for line in docs_collection {
+ // Rustdoc hides code lines starting with `# ` and this removes them from Clippy's lint list :)
+ if is_code_block_rust && line.trim_start().starts_with("# ") {
+ continue;
+ }
+
+ // The line should be represented in the lint list, even if it's just an empty line
+ docs.push('\n');
+ if let Some(info) = line.trim_start().strip_prefix("```") {
+ in_code_block = !in_code_block;
+ is_code_block_rust = false;
+ if in_code_block {
+ let lang = info
+ .trim()
+ .split(',')
+ // remove rustdoc directives
+ .find(|&s| !matches!(s, "" | "ignore" | "no_run" | "should_panic"))
+ // if no language is present, fill in "rust"
+ .unwrap_or("rust");
+ docs.push_str("```");
+ docs.push_str(lang);
+
+ is_code_block_rust = lang == "rust";
+ continue;
+ }
+ }
+ // This removes the leading space that the macro translation introduces
+ if let Some(stripped_doc) = line.strip_prefix(' ') {
+ docs.push_str(stripped_doc);
+ } else if !line.is_empty() {
+ docs.push_str(line);
+ }
+ }
+
+ docs
+}
+
+fn get_lint_version(cx: &LateContext<'_>, item: &Item<'_>) -> String {
+ extract_clippy_version_value(cx, item).map_or_else(
+ || VERSION_DEFAULT_STR.to_string(),
+ |version| version.as_str().to_string(),
+ )
+}
+
+fn get_lint_group_and_level_or_lint(
+ cx: &LateContext<'_>,
+ lint_name: &str,
+ item: &Item<'_>,
+) -> Option<(String, &'static str)> {
+ let result = cx.lint_store.check_lint_name(
+ lint_name,
+ Some(sym::clippy),
+ &[Ident::with_dummy_span(sym::clippy)].into_iter().collect(),
+ );
+ if let CheckLintNameResult::Tool(Ok(lint_lst)) = result {
+ if let Some(group) = get_lint_group(cx, lint_lst[0]) {
+ if EXCLUDED_LINT_GROUPS.contains(&group.as_str()) {
+ return None;
+ }
+
+ if let Some(level) = get_lint_level_from_group(&group) {
+ Some((group, level))
+ } else {
+ lint_collection_error_item(
+ cx,
+ item,
+ &format!("Unable to determine lint level for found group `{}`", group),
+ );
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to determine lint group");
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to find lint in lint_store");
+ None
+ }
+}
+
+fn get_lint_group(cx: &LateContext<'_>, lint_id: LintId) -> Option<String> {
+ for (group_name, lints, _) in cx.lint_store.get_lint_groups() {
+ if IGNORED_LINT_GROUPS.contains(&group_name) {
+ continue;
+ }
+
+ if lints.iter().any(|group_lint| *group_lint == lint_id) {
+ let group = group_name.strip_prefix(CLIPPY_LINT_GROUP_PREFIX).unwrap_or(group_name);
+ return Some((*group).to_string());
+ }
+ }
+
+ None
+}
+
+fn get_lint_level_from_group(lint_group: &str) -> Option<&'static str> {
+ DEFAULT_LINT_LEVELS
+ .iter()
+ .find_map(|(group_name, group_level)| (*group_name == lint_group).then_some(*group_level))
+}
+
+pub(super) fn is_deprecated_lint(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(ref path) = ty.kind {
+ if let hir::def::Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, ty.hir_id) {
+ return match_def_path(cx, def_id, &DEPRECATED_LINT_TYPE);
+ }
+ }
+
+ false
+}
+
+fn collect_renames(lints: &mut Vec<LintMetadata>) {
+ for lint in lints {
+ let mut collected = String::new();
+ let mut names = vec![lint.id.clone()];
+
+ loop {
+ if let Some(lint_name) = names.pop() {
+ for (k, v) in RENAMED_LINTS {
+ if_chain! {
+ if let Some(name) = v.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ if name == lint_name;
+ if let Some(past_name) = k.strip_prefix(CLIPPY_LINT_GROUP_PREFIX);
+ then {
+ write!(collected, RENAME_VALUE_TEMPLATE!(), name = past_name).unwrap();
+ names.push(past_name.to_string());
+ }
+ }
+ }
+
+ continue;
+ }
+
+ break;
+ }
+
+ if !collected.is_empty() {
+ write!(&mut lint.docs, RENAMES_SECTION_TEMPLATE!(), names = collected).unwrap();
+ }
+ }
+}
+
+// ==================================================================
+// Lint emission
+// ==================================================================
+fn lint_collection_error_item(cx: &LateContext<'_>, item: &Item<'_>, message: &str) {
+ span_lint(
+ cx,
+ INTERNAL_METADATA_COLLECTOR,
+ item.ident.span,
+ &format!("metadata collection error for `{}`: {}", item.ident.name, message),
+ );
+}
+
+// ==================================================================
+// Applicability
+// ==================================================================
+/// This function checks if a given expression is equal to a simple lint emission function call.
+/// It will return the function arguments if the emission matched any function.
+fn match_lint_emission<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) -> Option<&'hir [hir::Expr<'hir>]> {
+ LINT_EMISSION_FUNCTIONS
+ .iter()
+ .find_map(|emission_fn| match_function_call(cx, expr, emission_fn))
+}
+
+fn take_higher_applicability(a: Option<usize>, b: Option<usize>) -> Option<usize> {
+ a.map_or(b, |a| a.max(b.unwrap_or_default()).into())
+}
+
+fn extract_emission_info<'hir>(
+ cx: &LateContext<'hir>,
+ args: &'hir [hir::Expr<'hir>],
+) -> Vec<(String, Option<usize>, bool)> {
+ let mut lints = Vec::new();
+ let mut applicability = None;
+ let mut multi_part = false;
+
+ for arg in args {
+ let (arg_ty, _) = walk_ptrs_ty_depth(cx.typeck_results().expr_ty(arg));
+
+ if match_type(cx, arg_ty, &paths::LINT) {
+ // If we found the lint arg, extract the lint name
+ let mut resolved_lints = resolve_lints(cx, arg);
+ lints.append(&mut resolved_lints);
+ } else if match_type(cx, arg_ty, &paths::APPLICABILITY) {
+ applicability = resolve_applicability(cx, arg);
+ } else if arg_ty.is_closure() {
+ multi_part |= check_is_multi_part(cx, arg);
+ applicability = applicability.or_else(|| resolve_applicability(cx, arg));
+ }
+ }
+
+ lints
+ .into_iter()
+ .map(|lint_name| (lint_name, applicability, multi_part))
+ .collect()
+}
+
+/// Resolves the possible lints that this expression could reference
+fn resolve_lints<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
+ let mut resolver = LintResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.lints
+}
+
+/// This function tries to resolve the linked applicability to the given expression.
+fn resolve_applicability<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
+ let mut resolver = ApplicabilityResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.complete()
+}
+
+fn check_is_multi_part<'hir>(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
+ if let ExprKind::Closure(&Closure { body, .. }) = closure_expr.kind {
+ let mut scanner = IsMultiSpanScanner::new(cx);
+ intravisit::walk_body(&mut scanner, cx.tcx.hir().body(body));
+ return scanner.is_multi_part();
+ } else if let Some(local) = get_parent_local(cx, closure_expr) {
+ if let Some(local_init) = local.init {
+ return check_is_multi_part(cx, local_init);
+ }
+ }
+
+ false
+}
+
+struct LintResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ lints: Vec<String>,
+}
+
+impl<'a, 'hir> LintResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ lints: Vec::<String>::default(),
+ }
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for LintResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ if_chain! {
+ if let ExprKind::Path(qpath) = &expr.kind;
+ if let QPath::Resolved(_, path) = qpath;
+
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+ if match_type(self.cx, expr_ty, &paths::LINT);
+ then {
+ if let hir::def::Res::Def(DefKind::Static(..), _) = path.res {
+ let lint_name = last_path_segment(qpath).ident.name;
+ self.lints.push(sym_to_string(lint_name).to_ascii_lowercase());
+ } else if let Some(local) = get_parent_local(self.cx, expr) {
+ if let Some(local_init) = local.init {
+ intravisit::walk_expr(self, local_init);
+ }
+ }
+ }
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct ApplicabilityResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ /// This is the index of highest `Applicability` for `paths::APPLICABILITY_VALUES`
+ applicability_index: Option<usize>,
+}
+
+impl<'a, 'hir> ApplicabilityResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ applicability_index: None,
+ }
+ }
+
+ fn add_new_index(&mut self, new_index: usize) {
+ self.applicability_index = take_higher_applicability(self.applicability_index, Some(new_index));
+ }
+
+ fn complete(self) -> Option<usize> {
+ self.applicability_index
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_path(&mut self, path: &'hir hir::Path<'hir>, _id: hir::HirId) {
+ for (index, enum_value) in paths::APPLICABILITY_VALUES.iter().enumerate() {
+ if match_path(path, enum_value) {
+ self.add_new_index(index);
+ return;
+ }
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+
+ if_chain! {
+ if match_type(self.cx, expr_ty, &paths::APPLICABILITY);
+ if let Some(local) = get_parent_local(self.cx, expr);
+ if let Some(local_init) = local.init;
+ then {
+ intravisit::walk_expr(self, local_init);
+ }
+ };
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This returns the parent local node if the expression is a reference one
+fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
+ if let ExprKind::Path(QPath::Resolved(_, path)) = expr.kind {
+ if let hir::def::Res::Local(local_hir) = path.res {
+ return get_parent_local_hir_id(cx, local_hir);
+ }
+ }
+
+ None
+}
+
+fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
+ let map = cx.tcx.hir();
+
+ match map.find(map.get_parent_node(hir_id)) {
+ Some(hir::Node::Local(local)) => Some(local),
+ Some(hir::Node::Pat(pattern)) => get_parent_local_hir_id(cx, pattern.hir_id),
+ _ => None,
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct IsMultiSpanScanner<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ suggestion_count: usize,
+}
+
+impl<'a, 'hir> IsMultiSpanScanner<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ suggestion_count: 0,
+ }
+ }
+
+ /// Add a new single expression suggestion to the counter
+ fn add_single_span_suggestion(&mut self) {
+ self.suggestion_count += 1;
+ }
+
+ /// Signals that a suggestion with possible multiple spans was found
+ fn add_multi_part_suggestion(&mut self) {
+ self.suggestion_count += 2;
+ }
+
+ /// Checks if the suggestions include multiple spans
+ fn is_multi_part(&self) -> bool {
+ self.suggestion_count > 1
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ // Early return if the lint is already multi span
+ if self.is_multi_part() {
+ return;
+ }
+
+ match &expr.kind {
+ ExprKind::Call(fn_expr, _args) => {
+ let found_function = SUGGESTION_FUNCTIONS
+ .iter()
+ .any(|func_path| match_function_call(self.cx, fn_expr, func_path).is_some());
+ if found_function {
+ // These functions are all multi part suggestions
+ self.add_single_span_suggestion();
+ }
+ },
+ ExprKind::MethodCall(path, arg, _arg_span) => {
+ let (self_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(&arg[0]));
+ if match_type(self.cx, self_ty, &paths::DIAGNOSTIC_BUILDER) {
+ let called_method = path.ident.name.as_str().to_string();
+ for (method_name, is_multi_part) in &SUGGESTION_DIAGNOSTIC_BUILDER_METHODS {
+ if *method_name == called_method {
+ if *is_multi_part {
+ self.add_multi_part_suggestion();
+ } else {
+ self.add_single_span_suggestion();
+ }
+ break;
+ }
+ }
+ }
+ },
+ _ => {},
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
--- /dev/null
- if let ExprKind::MethodCall(method_name, exprs, _) = expr.kind;
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::paths;
+use clippy_utils::ty::match_type;
+use if_chain::if_chain;
+use rustc_hir::{Expr, ExprKind, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of File::read_to_end and File::read_to_string.
+ ///
+ /// ### Why is this bad?
+ /// `fs::{read, read_to_string}` provide the same functionality when `buf` is empty with fewer imports and no intermediate values.
+ /// See also: [fs::read docs](https://doc.rust-lang.org/std/fs/fn.read.html), [fs::read_to_string docs](https://doc.rust-lang.org/std/fs/fn.read_to_string.html)
+ ///
+ /// ### Example
+ /// ```rust,no_run
+ /// # use std::io::Read;
+ /// # use std::fs::File;
+ /// let mut f = File::open("foo.txt").unwrap();
+ /// let mut bytes = Vec::new();
+ /// f.read_to_end(&mut bytes).unwrap();
+ /// ```
+ /// Can be written more concisely as
+ /// ```rust,no_run
+ /// # use std::fs;
+ /// let mut bytes = fs::read("foo.txt").unwrap();
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub VERBOSE_FILE_READS,
+ restriction,
+ "use of `File::read_to_end` or `File::read_to_string`"
+}
+
+declare_lint_pass!(VerboseFileReads => [VERBOSE_FILE_READS]);
+
+impl<'tcx> LateLintPass<'tcx> for VerboseFileReads {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if is_file_read_to_end(cx, expr) {
+ span_lint_and_help(
+ cx,
+ VERBOSE_FILE_READS,
+ expr.span,
+ "use of `File::read_to_end`",
+ None,
+ "consider using `fs::read` instead",
+ );
+ } else if is_file_read_to_string(cx, expr) {
+ span_lint_and_help(
+ cx,
+ VERBOSE_FILE_READS,
+ expr.span,
+ "use of `File::read_to_string`",
+ None,
+ "consider using `fs::read_to_string` instead",
+ );
+ }
+ }
+}
+
+fn is_file_read_to_end<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+ if_chain! {
- if let ExprKind::Path(QPath::Resolved(None, _)) = &exprs[0].kind;
- let ty = cx.typeck_results().expr_ty(&exprs[0]);
++ if let ExprKind::MethodCall(method_name, [recv, ..], _) = expr.kind;
+ if method_name.ident.as_str() == "read_to_end";
++ if let ExprKind::Path(QPath::Resolved(None, _)) = &recv.kind;
++ let ty = cx.typeck_results().expr_ty(recv);
+ if match_type(cx, ty, &paths::FILE);
+ then {
+ return true
+ }
+ }
+ false
+}
+
+fn is_file_read_to_string<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+ if_chain! {
+ if let ExprKind::MethodCall(method_name, exprs, _) = expr.kind;
+ if method_name.ident.as_str() == "read_to_string";
+ if let ExprKind::Path(QPath::Resolved(None, _)) = &exprs[0].kind;
+ let ty = cx.typeck_results().expr_ty(&exprs[0]);
+ if match_type(cx, ty, &paths::FILE);
+ then {
+ return true
+ }
+ }
+ false
+}
--- /dev/null
- version = "0.1.64"
+[package]
+name = "clippy_utils"
++version = "0.1.65"
+edition = "2021"
+publish = false
+
+[dependencies]
+arrayvec = { version = "0.7", default-features = false }
+if_chain = "1.0"
+rustc-semver = "1.1"
+
+[features]
+deny-warnings = []
+internal = []
+
+[package.metadata.rust-analyzer]
+# This crate uses #[feature(rustc_private)]
+rustc_private = true
--- /dev/null
--- /dev/null
++//! This module handles checking if the span given is from a proc-macro or not.
++//!
++//! Proc-macros are capable of setting the span of every token they output to a few possible spans.
++//! This includes spans we can detect easily as coming from a proc-macro (e.g. the call site
++//! or the def site), and spans we can't easily detect as such (e.g. the span of any token
++//! passed into the proc macro). This capability means proc-macros are capable of generating code
++//! with a span that looks like it was written by the user, but which should not be linted by clippy
++//! as it was generated by an external macro.
++//!
++//! That brings us to this module. The current approach is to determine a small bit of text which
++//! must exist at both the start and the end of an item (e.g. an expression or a path) assuming the
++//! code was written, and check if the span contains that text. Note this will only work correctly
++//! if the span is not from a `macro_rules` based macro.
++
++use rustc_ast::ast::{IntTy, LitIntType, LitKind, StrStyle, UintTy};
++use rustc_hir::{
++ intravisit::FnKind, Block, BlockCheckMode, Body, Closure, Destination, Expr, ExprKind, FieldDef, FnHeader, HirId,
++ Impl, ImplItem, ImplItemKind, IsAuto, Item, ItemKind, LoopSource, MatchSource, Node, QPath, TraitItem,
++ TraitItemKind, UnOp, UnsafeSource, Unsafety, Variant, VariantData, YieldSource,
++};
++use rustc_lint::{LateContext, LintContext};
++use rustc_middle::ty::TyCtxt;
++use rustc_session::Session;
++use rustc_span::{Span, Symbol};
++use rustc_target::spec::abi::Abi;
++
++/// The search pattern to look for. Used by `span_matches_pat`
++#[derive(Clone, Copy)]
++pub enum Pat {
++ /// A single string.
++ Str(&'static str),
++ /// Any of the given strings.
++ MultiStr(&'static [&'static str]),
++ /// The string representation of the symbol.
++ Sym(Symbol),
++ /// Any decimal or hexadecimal digit depending on the location.
++ Num,
++}
++
++/// Checks if the start and the end of the span's text matches the patterns. This will return false
++/// if the span crosses multiple files or if source is not available.
++fn span_matches_pat(sess: &Session, span: Span, start_pat: Pat, end_pat: Pat) -> bool {
++ let pos = sess.source_map().lookup_byte_offset(span.lo());
++ let Some(ref src) = pos.sf.src else {
++ return false;
++ };
++ let end = span.hi() - pos.sf.start_pos;
++ src.get(pos.pos.0 as usize..end.0 as usize).map_or(false, |s| {
++ // Spans can be wrapped in a mixture or parenthesis, whitespace, and trailing commas.
++ let start_str = s.trim_start_matches(|c: char| c.is_whitespace() || c == '(');
++ let end_str = s.trim_end_matches(|c: char| c.is_whitespace() || c == ')' || c == ',');
++ (match start_pat {
++ Pat::Str(text) => start_str.starts_with(text),
++ Pat::MultiStr(texts) => texts.iter().any(|s| start_str.starts_with(s)),
++ Pat::Sym(sym) => start_str.starts_with(sym.as_str()),
++ Pat::Num => start_str.as_bytes().first().map_or(false, u8::is_ascii_digit),
++ } && match end_pat {
++ Pat::Str(text) => end_str.ends_with(text),
++ Pat::MultiStr(texts) => texts.iter().any(|s| start_str.ends_with(s)),
++ Pat::Sym(sym) => end_str.ends_with(sym.as_str()),
++ Pat::Num => end_str.as_bytes().last().map_or(false, u8::is_ascii_hexdigit),
++ })
++ })
++}
++
++/// Get the search patterns to use for the given literal
++fn lit_search_pat(lit: &LitKind) -> (Pat, Pat) {
++ match lit {
++ LitKind::Str(_, StrStyle::Cooked) => (Pat::Str("\""), Pat::Str("\"")),
++ LitKind::Str(_, StrStyle::Raw(0)) => (Pat::Str("r"), Pat::Str("\"")),
++ LitKind::Str(_, StrStyle::Raw(_)) => (Pat::Str("r#"), Pat::Str("#")),
++ LitKind::ByteStr(_) => (Pat::Str("b\""), Pat::Str("\"")),
++ LitKind::Byte(_) => (Pat::Str("b'"), Pat::Str("'")),
++ LitKind::Char(_) => (Pat::Str("'"), Pat::Str("'")),
++ LitKind::Int(_, LitIntType::Signed(IntTy::Isize)) => (Pat::Num, Pat::Str("isize")),
++ LitKind::Int(_, LitIntType::Unsigned(UintTy::Usize)) => (Pat::Num, Pat::Str("usize")),
++ LitKind::Int(..) => (Pat::Num, Pat::Num),
++ LitKind::Float(..) => (Pat::Num, Pat::Str("")),
++ LitKind::Bool(true) => (Pat::Str("true"), Pat::Str("true")),
++ LitKind::Bool(false) => (Pat::Str("false"), Pat::Str("false")),
++ _ => (Pat::Str(""), Pat::Str("")),
++ }
++}
++
++/// Get the search patterns to use for the given path
++fn qpath_search_pat(path: &QPath<'_>) -> (Pat, Pat) {
++ match path {
++ QPath::Resolved(ty, path) => {
++ let start = if ty.is_some() {
++ Pat::Str("<")
++ } else {
++ path.segments
++ .first()
++ .map_or(Pat::Str(""), |seg| Pat::Sym(seg.ident.name))
++ };
++ let end = path.segments.last().map_or(Pat::Str(""), |seg| {
++ if seg.args.is_some() {
++ Pat::Str(">")
++ } else {
++ Pat::Sym(seg.ident.name)
++ }
++ });
++ (start, end)
++ },
++ QPath::TypeRelative(_, name) => (Pat::Str(""), Pat::Sym(name.ident.name)),
++ QPath::LangItem(..) => (Pat::Str(""), Pat::Str("")),
++ }
++}
++
++/// Get the search patterns to use for the given expression
++fn expr_search_pat(tcx: TyCtxt<'_>, e: &Expr<'_>) -> (Pat, Pat) {
++ match e.kind {
++ ExprKind::Box(e) => (Pat::Str("box"), expr_search_pat(tcx, e).1),
++ ExprKind::ConstBlock(_) => (Pat::Str("const"), Pat::Str("}")),
++ ExprKind::Tup([]) => (Pat::Str(")"), Pat::Str("(")),
++ ExprKind::Unary(UnOp::Deref, e) => (Pat::Str("*"), expr_search_pat(tcx, e).1),
++ ExprKind::Unary(UnOp::Not, e) => (Pat::Str("!"), expr_search_pat(tcx, e).1),
++ ExprKind::Unary(UnOp::Neg, e) => (Pat::Str("-"), expr_search_pat(tcx, e).1),
++ ExprKind::Lit(ref lit) => lit_search_pat(&lit.node),
++ ExprKind::Array(_) | ExprKind::Repeat(..) => (Pat::Str("["), Pat::Str("]")),
++ ExprKind::Call(e, []) | ExprKind::MethodCall(_, [e], _) => (expr_search_pat(tcx, e).0, Pat::Str("(")),
++ ExprKind::Call(first, [.., last])
++ | ExprKind::MethodCall(_, [first, .., last], _)
++ | ExprKind::Binary(_, first, last)
++ | ExprKind::Tup([first, .., last])
++ | ExprKind::Assign(first, last, _)
++ | ExprKind::AssignOp(_, first, last) => (expr_search_pat(tcx, first).0, expr_search_pat(tcx, last).1),
++ ExprKind::Tup([e]) | ExprKind::DropTemps(e) => expr_search_pat(tcx, e),
++ ExprKind::Cast(e, _) | ExprKind::Type(e, _) => (expr_search_pat(tcx, e).0, Pat::Str("")),
++ ExprKind::Let(let_expr) => (Pat::Str("let"), expr_search_pat(tcx, let_expr.init).1),
++ ExprKind::If(..) => (Pat::Str("if"), Pat::Str("}")),
++ ExprKind::Loop(_, Some(_), _, _) | ExprKind::Block(_, Some(_)) => (Pat::Str("'"), Pat::Str("}")),
++ ExprKind::Loop(_, None, LoopSource::Loop, _) => (Pat::Str("loop"), Pat::Str("}")),
++ ExprKind::Loop(_, None, LoopSource::While, _) => (Pat::Str("while"), Pat::Str("}")),
++ ExprKind::Loop(_, None, LoopSource::ForLoop, _) | ExprKind::Match(_, _, MatchSource::ForLoopDesugar) => {
++ (Pat::Str("for"), Pat::Str("}"))
++ },
++ ExprKind::Match(_, _, MatchSource::Normal) => (Pat::Str("match"), Pat::Str("}")),
++ ExprKind::Match(e, _, MatchSource::TryDesugar) => (expr_search_pat(tcx, e).0, Pat::Str("?")),
++ ExprKind::Match(e, _, MatchSource::AwaitDesugar) | ExprKind::Yield(e, YieldSource::Await { .. }) => {
++ (expr_search_pat(tcx, e).0, Pat::Str("await"))
++ },
++ ExprKind::Closure(&Closure { body, .. }) => (Pat::Str(""), expr_search_pat(tcx, &tcx.hir().body(body).value).1),
++ ExprKind::Block(
++ Block {
++ rules: BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided),
++ ..
++ },
++ None,
++ ) => (Pat::Str("unsafe"), Pat::Str("}")),
++ ExprKind::Block(_, None) => (Pat::Str("{"), Pat::Str("}")),
++ ExprKind::Field(e, name) => (expr_search_pat(tcx, e).0, Pat::Sym(name.name)),
++ ExprKind::Index(e, _) => (expr_search_pat(tcx, e).0, Pat::Str("]")),
++ ExprKind::Path(ref path) => qpath_search_pat(path),
++ ExprKind::AddrOf(_, _, e) => (Pat::Str("&"), expr_search_pat(tcx, e).1),
++ ExprKind::Break(Destination { label: None, .. }, None) => (Pat::Str("break"), Pat::Str("break")),
++ ExprKind::Break(Destination { label: Some(name), .. }, None) => (Pat::Str("break"), Pat::Sym(name.ident.name)),
++ ExprKind::Break(_, Some(e)) => (Pat::Str("break"), expr_search_pat(tcx, e).1),
++ ExprKind::Continue(Destination { label: None, .. }) => (Pat::Str("continue"), Pat::Str("continue")),
++ ExprKind::Continue(Destination { label: Some(name), .. }) => (Pat::Str("continue"), Pat::Sym(name.ident.name)),
++ ExprKind::Ret(None) => (Pat::Str("return"), Pat::Str("return")),
++ ExprKind::Ret(Some(e)) => (Pat::Str("return"), expr_search_pat(tcx, e).1),
++ ExprKind::Struct(path, _, _) => (qpath_search_pat(path).0, Pat::Str("}")),
++ ExprKind::Yield(e, YieldSource::Yield) => (Pat::Str("yield"), expr_search_pat(tcx, e).1),
++ _ => (Pat::Str(""), Pat::Str("")),
++ }
++}
++
++fn fn_header_search_pat(header: FnHeader) -> Pat {
++ if header.is_async() {
++ Pat::Str("async")
++ } else if header.is_const() {
++ Pat::Str("const")
++ } else if header.is_unsafe() {
++ Pat::Str("unsafe")
++ } else if header.abi != Abi::Rust {
++ Pat::Str("extern")
++ } else {
++ Pat::MultiStr(&["fn", "extern"])
++ }
++}
++
++fn item_search_pat(item: &Item<'_>) -> (Pat, Pat) {
++ let (start_pat, end_pat) = match &item.kind {
++ ItemKind::ExternCrate(_) => (Pat::Str("extern"), Pat::Str(";")),
++ ItemKind::Static(..) => (Pat::Str("static"), Pat::Str(";")),
++ ItemKind::Const(..) => (Pat::Str("const"), Pat::Str(";")),
++ ItemKind::Fn(sig, ..) => (fn_header_search_pat(sig.header), Pat::Str("")),
++ ItemKind::ForeignMod { .. } => (Pat::Str("extern"), Pat::Str("}")),
++ ItemKind::TyAlias(..) | ItemKind::OpaqueTy(_) => (Pat::Str("type"), Pat::Str(";")),
++ ItemKind::Enum(..) => (Pat::Str("enum"), Pat::Str("}")),
++ ItemKind::Struct(VariantData::Struct(..), _) => (Pat::Str("struct"), Pat::Str("}")),
++ ItemKind::Struct(..) => (Pat::Str("struct"), Pat::Str(";")),
++ ItemKind::Union(..) => (Pat::Str("union"), Pat::Str("}")),
++ ItemKind::Trait(_, Unsafety::Unsafe, ..)
++ | ItemKind::Impl(Impl {
++ unsafety: Unsafety::Unsafe,
++ ..
++ }) => (Pat::Str("unsafe"), Pat::Str("}")),
++ ItemKind::Trait(IsAuto::Yes, ..) => (Pat::Str("auto"), Pat::Str("}")),
++ ItemKind::Trait(..) => (Pat::Str("trait"), Pat::Str("}")),
++ ItemKind::Impl(_) => (Pat::Str("impl"), Pat::Str("}")),
++ _ => return (Pat::Str(""), Pat::Str("")),
++ };
++ if item.vis_span.is_empty() {
++ (start_pat, end_pat)
++ } else {
++ (Pat::Str("pub"), end_pat)
++ }
++}
++
++fn trait_item_search_pat(item: &TraitItem<'_>) -> (Pat, Pat) {
++ match &item.kind {
++ TraitItemKind::Const(..) => (Pat::Str("const"), Pat::Str(";")),
++ TraitItemKind::Type(..) => (Pat::Str("type"), Pat::Str(";")),
++ TraitItemKind::Fn(sig, ..) => (fn_header_search_pat(sig.header), Pat::Str("")),
++ }
++}
++
++fn impl_item_search_pat(item: &ImplItem<'_>) -> (Pat, Pat) {
++ let (start_pat, end_pat) = match &item.kind {
++ ImplItemKind::Const(..) => (Pat::Str("const"), Pat::Str(";")),
++ ImplItemKind::TyAlias(..) => (Pat::Str("type"), Pat::Str(";")),
++ ImplItemKind::Fn(sig, ..) => (fn_header_search_pat(sig.header), Pat::Str("")),
++ };
++ if item.vis_span.is_empty() {
++ (start_pat, end_pat)
++ } else {
++ (Pat::Str("pub"), end_pat)
++ }
++}
++
++fn field_def_search_pat(def: &FieldDef<'_>) -> (Pat, Pat) {
++ if def.vis_span.is_empty() {
++ if def.is_positional() {
++ (Pat::Str(""), Pat::Str(""))
++ } else {
++ (Pat::Sym(def.ident.name), Pat::Str(""))
++ }
++ } else {
++ (Pat::Str("pub"), Pat::Str(""))
++ }
++}
++
++fn variant_search_pat(v: &Variant<'_>) -> (Pat, Pat) {
++ match v.data {
++ VariantData::Struct(..) => (Pat::Sym(v.ident.name), Pat::Str("}")),
++ VariantData::Tuple(..) => (Pat::Sym(v.ident.name), Pat::Str("")),
++ VariantData::Unit(..) => (Pat::Sym(v.ident.name), Pat::Sym(v.ident.name)),
++ }
++}
++
++fn fn_kind_pat(tcx: TyCtxt<'_>, kind: &FnKind<'_>, body: &Body<'_>, hir_id: HirId) -> (Pat, Pat) {
++ let (start_pat, end_pat) = match kind {
++ FnKind::ItemFn(.., header) => (fn_header_search_pat(*header), Pat::Str("")),
++ FnKind::Method(.., sig) => (fn_header_search_pat(sig.header), Pat::Str("")),
++ FnKind::Closure => return (Pat::Str(""), expr_search_pat(tcx, &body.value).1),
++ };
++ let start_pat = match tcx.hir().get(hir_id) {
++ Node::Item(Item { vis_span, .. }) | Node::ImplItem(ImplItem { vis_span, .. }) => {
++ if vis_span.is_empty() {
++ start_pat
++ } else {
++ Pat::Str("pub")
++ }
++ },
++ Node::TraitItem(_) => start_pat,
++ _ => Pat::Str(""),
++ };
++ (start_pat, end_pat)
++}
++
++pub trait WithSearchPat {
++ type Context: LintContext;
++ fn search_pat(&self, cx: &Self::Context) -> (Pat, Pat);
++ fn span(&self) -> Span;
++}
++macro_rules! impl_with_search_pat {
++ ($cx:ident: $ty:ident with $fn:ident $(($tcx:ident))?) => {
++ impl<'cx> WithSearchPat for $ty<'cx> {
++ type Context = $cx<'cx>;
++ #[allow(unused_variables)]
++ fn search_pat(&self, cx: &Self::Context) -> (Pat, Pat) {
++ $(let $tcx = cx.tcx;)?
++ $fn($($tcx,)? self)
++ }
++ fn span(&self) -> Span {
++ self.span
++ }
++ }
++ };
++}
++impl_with_search_pat!(LateContext: Expr with expr_search_pat(tcx));
++impl_with_search_pat!(LateContext: Item with item_search_pat);
++impl_with_search_pat!(LateContext: TraitItem with trait_item_search_pat);
++impl_with_search_pat!(LateContext: ImplItem with impl_item_search_pat);
++impl_with_search_pat!(LateContext: FieldDef with field_def_search_pat);
++impl_with_search_pat!(LateContext: Variant with variant_search_pat);
++
++impl<'cx> WithSearchPat for (&FnKind<'cx>, &Body<'cx>, HirId, Span) {
++ type Context = LateContext<'cx>;
++
++ fn search_pat(&self, cx: &Self::Context) -> (Pat, Pat) {
++ fn_kind_pat(cx.tcx, self.0, self.1, self.2)
++ }
++
++ fn span(&self) -> Span {
++ self.3
++ }
++}
++
++/// Checks if the item likely came from a proc-macro.
++///
++/// This should be called after `in_external_macro` and the initial pattern matching of the ast as
++/// it is significantly slower than both of those.
++pub fn is_from_proc_macro<T: WithSearchPat>(cx: &T::Context, item: &T) -> bool {
++ let (start_pat, end_pat) = item.search_pat(cx);
++ !span_matches_pat(cx.sess(), item.span(), start_pat, end_pat)
++}
++
++/// Checks if the span actually refers to a match expression
++pub fn is_span_match(cx: &impl LintContext, span: Span) -> bool {
++ span_matches_pat(cx.sess(), span, Pat::Str("match"), Pat::Str("}"))
++}
++
++/// Checks if the span actually refers to an if expression
++pub fn is_span_if(cx: &impl LintContext, span: Span) -> bool {
++ span_matches_pat(cx.sess(), span, Pat::Str("if"), Pat::Str("}"))
++}
--- /dev/null
+#![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;
++mod check_proc_macro;
+pub mod comparisons;
+pub mod consts;
+pub mod diagnostics;
+pub mod eager_or_lazy;
+pub mod higher;
+mod hir_utils;
+pub mod macros;
+pub mod msrvs;
+pub mod numeric_literal;
+pub mod paths;
+pub mod ptr;
+pub mod qualify_min_const_fn;
+pub mod source;
+pub mod str_utils;
+pub mod sugg;
+pub mod ty;
+pub mod usage;
+pub mod visitors;
+
+pub use self::attrs::*;
++pub use self::check_proc_macro::{is_from_proc_macro, is_span_if, is_span_match};
+pub use self::hir_utils::{
+ both, count_eq, eq_expr_value, hash_expr, hash_stmt, over, HirEqInterExpr, SpanlessEq, SpanlessHash,
+};
+
+use 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);
+ 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().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
- lit_suffix_length(lit_kind).map_or((src, None), |suffix_length| {
- let (unsuffixed, suffix) = src.split_at(src.len() - suffix_length);
- (unsuffixed, Some(suffix))
- })
+use rustc_ast::ast::{Lit, LitFloatType, LitIntType, LitKind};
+use std::iter;
+
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+pub enum Radix {
+ Binary,
+ Octal,
+ Decimal,
+ Hexadecimal,
+}
+
+impl Radix {
+ /// Returns a reasonable digit group size for this radix.
+ #[must_use]
+ fn suggest_grouping(self) -> usize {
+ match self {
+ Self::Binary | Self::Hexadecimal => 4,
+ Self::Octal | Self::Decimal => 3,
+ }
+ }
+}
+
+/// A helper method to format numeric literals with digit grouping.
+/// `lit` must be a valid numeric literal without suffix.
+pub fn format(lit: &str, type_suffix: Option<&str>, float: bool) -> String {
+ NumericLiteral::new(lit, type_suffix, float).format()
+}
+
+#[derive(Debug)]
+pub struct NumericLiteral<'a> {
+ /// Which radix the literal was represented in.
+ pub radix: Radix,
+ /// The radix prefix, if present.
+ pub prefix: Option<&'a str>,
+
+ /// The integer part of the number.
+ pub integer: &'a str,
+ /// The fraction part of the number.
+ pub fraction: Option<&'a str>,
+ /// The exponent separator (b'e' or b'E') including preceding underscore if present
+ /// and the exponent part.
+ pub exponent: Option<(&'a str, &'a str)>,
+
+ /// The type suffix, including preceding underscore if present.
+ pub suffix: Option<&'a str>,
+}
+
+impl<'a> NumericLiteral<'a> {
+ pub fn from_lit(src: &'a str, lit: &Lit) -> Option<NumericLiteral<'a>> {
+ NumericLiteral::from_lit_kind(src, &lit.kind)
+ }
+
+ pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> {
+ let unsigned_src = src.strip_prefix('-').map_or(src, |s| s);
+ if lit_kind.is_numeric()
+ && unsigned_src
+ .trim_start()
+ .chars()
+ .next()
+ .map_or(false, |c| c.is_ascii_digit())
+ {
+ let (unsuffixed, suffix) = split_suffix(src, lit_kind);
+ let float = matches!(lit_kind, LitKind::Float(..));
+ Some(NumericLiteral::new(unsuffixed, suffix, float))
+ } else {
+ None
+ }
+ }
+
+ #[must_use]
+ pub fn new(lit: &'a str, suffix: Option<&'a str>, float: bool) -> Self {
+ // Determine delimiter for radix prefix, if present, and radix.
+ let radix = if lit.starts_with("0x") {
+ Radix::Hexadecimal
+ } else if lit.starts_with("0b") {
+ Radix::Binary
+ } else if lit.starts_with("0o") {
+ Radix::Octal
+ } else {
+ Radix::Decimal
+ };
+
+ // Grab part of the literal after prefix, if present.
+ let (prefix, mut sans_prefix) = if radix == Radix::Decimal {
+ (None, lit)
+ } else {
+ let (p, s) = lit.split_at(2);
+ (Some(p), s)
+ };
+
+ if suffix.is_some() && sans_prefix.ends_with('_') {
+ // The '_' before the suffix isn't part of the digits
+ sans_prefix = &sans_prefix[..sans_prefix.len() - 1];
+ }
+
+ let (integer, fraction, exponent) = Self::split_digit_parts(sans_prefix, float);
+
+ Self {
+ radix,
+ prefix,
+ integer,
+ fraction,
+ exponent,
+ suffix,
+ }
+ }
+
+ pub fn is_decimal(&self) -> bool {
+ self.radix == Radix::Decimal
+ }
+
+ pub fn split_digit_parts(digits: &str, float: bool) -> (&str, Option<&str>, Option<(&str, &str)>) {
+ let mut integer = digits;
+ let mut fraction = None;
+ let mut exponent = None;
+
+ if float {
+ for (i, c) in digits.char_indices() {
+ match c {
+ '.' => {
+ integer = &digits[..i];
+ fraction = Some(&digits[i + 1..]);
+ },
+ 'e' | 'E' => {
+ let exp_start = if digits[..i].ends_with('_') { i - 1 } else { i };
+
+ if integer.len() > exp_start {
+ integer = &digits[..exp_start];
+ } else {
+ fraction = Some(&digits[integer.len() + 1..exp_start]);
+ };
+ exponent = Some((&digits[exp_start..=i], &digits[i + 1..]));
+ break;
+ },
+ _ => {},
+ }
+ }
+ }
+
+ (integer, fraction, exponent)
+ }
+
+ /// Returns literal formatted in a sensible way.
+ pub fn format(&self) -> String {
+ let mut output = String::new();
+
+ if let Some(prefix) = self.prefix {
+ output.push_str(prefix);
+ }
+
+ let group_size = self.radix.suggest_grouping();
+
+ Self::group_digits(
+ &mut output,
+ self.integer,
+ group_size,
+ true,
+ self.radix == Radix::Hexadecimal,
+ );
+
+ if let Some(fraction) = self.fraction {
+ output.push('.');
+ Self::group_digits(&mut output, fraction, group_size, false, false);
+ }
+
+ if let Some((separator, exponent)) = self.exponent {
+ if exponent != "0" {
+ output.push_str(separator);
+ Self::group_digits(&mut output, exponent, group_size, true, false);
+ }
+ }
+
+ if let Some(suffix) = self.suffix {
+ if output.ends_with('.') {
+ output.push('0');
+ }
+ output.push('_');
+ output.push_str(suffix);
+ }
+
+ output
+ }
+
+ pub fn group_digits(output: &mut String, input: &str, group_size: usize, partial_group_first: bool, pad: bool) {
+ debug_assert!(group_size > 0);
+
+ let mut digits = input.chars().filter(|&c| c != '_');
+
+ // The exponent may have a sign, output it early, otherwise it will be
+ // treated as a digit
+ if digits.clone().next() == Some('-') {
+ let _ = digits.next();
+ output.push('-');
+ }
+
+ let first_group_size;
+
+ if partial_group_first {
+ first_group_size = (digits.clone().count() - 1) % group_size + 1;
+ if pad {
+ for _ in 0..group_size - first_group_size {
+ output.push('0');
+ }
+ }
+ } else {
+ first_group_size = group_size;
+ }
+
+ for _ in 0..first_group_size {
+ if let Some(digit) = digits.next() {
+ output.push(digit);
+ }
+ }
+
+ for (c, i) in iter::zip(digits, (0..group_size).cycle()) {
+ if i == 0 {
+ output.push('_');
+ }
+ output.push(c);
+ }
+ }
+}
+
+fn split_suffix<'a>(src: &'a str, lit_kind: &LitKind) -> (&'a str, Option<&'a str>) {
+ debug_assert!(lit_kind.is_numeric());
++ lit_suffix_length(lit_kind)
++ .and_then(|suffix_length| src.len().checked_sub(suffix_length))
++ .map_or((src, None), |split_pos| {
++ let (unsuffixed, suffix) = src.split_at(split_pos);
++ (unsuffixed, Some(suffix))
++ })
+}
+
+fn lit_suffix_length(lit_kind: &LitKind) -> Option<usize> {
+ debug_assert!(lit_kind.is_numeric());
+ let suffix = match lit_kind {
+ LitKind::Int(_, int_lit_kind) => match int_lit_kind {
+ LitIntType::Signed(int_ty) => Some(int_ty.name_str()),
+ LitIntType::Unsigned(uint_ty) => Some(uint_ty.name_str()),
+ LitIntType::Unsuffixed => None,
+ },
+ LitKind::Float(_, float_lit_kind) => match float_lit_kind {
+ LitFloatType::Suffixed(float_ty) => Some(float_ty.name_str()),
+ LitFloatType::Unsuffixed => None,
+ },
+ _ => None,
+ };
+
+ suffix.map(str::len)
+}
--- /dev/null
+//! This module contains paths to types and functions Clippy needs to know
+//! about.
+//!
+//! Whenever possible, please consider diagnostic items over hardcoded paths.
+//! See <https://github.com/rust-lang/rust-clippy/issues/5393> for more information.
+
+#[cfg(feature = "internal")]
+pub const APPLICABILITY: [&str; 2] = ["rustc_lint_defs", "Applicability"];
+#[cfg(feature = "internal")]
+pub const APPLICABILITY_VALUES: [[&str; 3]; 4] = [
+ ["rustc_lint_defs", "Applicability", "Unspecified"],
+ ["rustc_lint_defs", "Applicability", "HasPlaceholders"],
+ ["rustc_lint_defs", "Applicability", "MaybeIncorrect"],
+ ["rustc_lint_defs", "Applicability", "MachineApplicable"],
+];
+#[cfg(feature = "internal")]
+pub const DIAGNOSTIC_BUILDER: [&str; 3] = ["rustc_errors", "diagnostic_builder", "DiagnosticBuilder"];
+pub const ARC_PTR_EQ: [&str; 4] = ["alloc", "sync", "Arc", "ptr_eq"];
+pub const ASMUT_TRAIT: [&str; 3] = ["core", "convert", "AsMut"];
+pub const ASREF_TRAIT: [&str; 3] = ["core", "convert", "AsRef"];
+pub const BTREEMAP_CONTAINS_KEY: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "contains_key"];
+pub const BTREEMAP_ENTRY: [&str; 6] = ["alloc", "collections", "btree", "map", "entry", "Entry"];
+pub const BTREEMAP_INSERT: [&str; 6] = ["alloc", "collections", "btree", "map", "BTreeMap", "insert"];
+pub const BTREESET_ITER: [&str; 6] = ["alloc", "collections", "btree", "set", "BTreeSet", "iter"];
+pub const CLONE_TRAIT_METHOD: [&str; 4] = ["core", "clone", "Clone", "clone"];
+pub const COW: [&str; 3] = ["alloc", "borrow", "Cow"];
+pub const CORE_ITER_COLLECT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "collect"];
+pub const CORE_ITER_CLONED: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "cloned"];
+pub const CORE_ITER_COPIED: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "copied"];
+pub const CORE_ITER_FILTER: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "filter"];
+pub const CORE_ITER_INTO_ITER: [&str; 6] = ["core", "iter", "traits", "collect", "IntoIterator", "into_iter"];
+pub const CSTRING_AS_C_STR: [&str; 5] = ["alloc", "ffi", "c_str", "CString", "as_c_str"];
+pub const DEFAULT_TRAIT_METHOD: [&str; 4] = ["core", "default", "Default", "default"];
+pub const DEREF_MUT_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "DerefMut", "deref_mut"];
+/// Preferably use the diagnostic item `sym::deref_method` where possible
+pub const DEREF_TRAIT_METHOD: [&str; 5] = ["core", "ops", "deref", "Deref", "deref"];
+pub const DIR_BUILDER: [&str; 3] = ["std", "fs", "DirBuilder"];
+pub const DISPLAY_TRAIT: [&str; 3] = ["core", "fmt", "Display"];
+#[cfg(feature = "internal")]
+pub const EARLY_CONTEXT: [&str; 2] = ["rustc_lint", "EarlyContext"];
+#[cfg(feature = "internal")]
+pub const EARLY_LINT_PASS: [&str; 3] = ["rustc_lint", "passes", "EarlyLintPass"];
+pub const EXIT: [&str; 3] = ["std", "process", "exit"];
+pub const F32_EPSILON: [&str; 4] = ["core", "f32", "<impl f32>", "EPSILON"];
+pub const F64_EPSILON: [&str; 4] = ["core", "f64", "<impl f64>", "EPSILON"];
+pub const FILE: [&str; 3] = ["std", "fs", "File"];
+pub const FILE_TYPE: [&str; 3] = ["std", "fs", "FileType"];
+pub const FROM_FROM: [&str; 4] = ["core", "convert", "From", "from"];
+pub const FROM_ITERATOR_METHOD: [&str; 6] = ["core", "iter", "traits", "collect", "FromIterator", "from_iter"];
+pub const FROM_STR_METHOD: [&str; 5] = ["core", "str", "traits", "FromStr", "from_str"];
+pub const FUTURE_FROM_GENERATOR: [&str; 3] = ["core", "future", "from_generator"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const FUTURES_IO_ASYNCREADEXT: [&str; 3] = ["futures_util", "io", "AsyncReadExt"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const FUTURES_IO_ASYNCWRITEEXT: [&str; 3] = ["futures_util", "io", "AsyncWriteExt"];
+pub const HASHMAP_CONTAINS_KEY: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "contains_key"];
+pub const HASHMAP_ENTRY: [&str; 5] = ["std", "collections", "hash", "map", "Entry"];
+pub const HASHMAP_INSERT: [&str; 6] = ["std", "collections", "hash", "map", "HashMap", "insert"];
+pub const HASHSET_ITER: [&str; 6] = ["std", "collections", "hash", "set", "HashSet", "iter"];
+#[cfg(feature = "internal")]
+pub const IDENT: [&str; 3] = ["rustc_span", "symbol", "Ident"];
+#[cfg(feature = "internal")]
+pub const IDENT_AS_STR: [&str; 4] = ["rustc_span", "symbol", "Ident", "as_str"];
+pub const INDEX: [&str; 3] = ["core", "ops", "Index"];
+pub const INDEX_MUT: [&str; 3] = ["core", "ops", "IndexMut"];
+pub const INSERT_STR: [&str; 4] = ["alloc", "string", "String", "insert_str"];
+pub const IO_READ: [&str; 3] = ["std", "io", "Read"];
+pub const IO_WRITE: [&str; 3] = ["std", "io", "Write"];
+pub const IPADDR_V4: [&str; 5] = ["std", "net", "ip", "IpAddr", "V4"];
+pub const IPADDR_V6: [&str; 5] = ["std", "net", "ip", "IpAddr", "V6"];
+pub const ITER_COUNT: [&str; 6] = ["core", "iter", "traits", "iterator", "Iterator", "count"];
+pub const ITER_EMPTY: [&str; 5] = ["core", "iter", "sources", "empty", "Empty"];
+pub const ITER_REPEAT: [&str; 5] = ["core", "iter", "sources", "repeat", "repeat"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const ITERTOOLS_NEXT_TUPLE: [&str; 3] = ["itertools", "Itertools", "next_tuple"];
+#[cfg(feature = "internal")]
+pub const KW_MODULE: [&str; 3] = ["rustc_span", "symbol", "kw"];
+#[cfg(feature = "internal")]
+pub const LATE_CONTEXT: [&str; 2] = ["rustc_lint", "LateContext"];
+#[cfg(feature = "internal")]
+pub const LATE_LINT_PASS: [&str; 3] = ["rustc_lint", "passes", "LateLintPass"];
+#[cfg(feature = "internal")]
+pub const LINT: [&str; 2] = ["rustc_lint_defs", "Lint"];
+pub const MEM_SWAP: [&str; 3] = ["core", "mem", "swap"];
+pub const MUTEX_GUARD: [&str; 4] = ["std", "sync", "mutex", "MutexGuard"];
+pub const OPEN_OPTIONS: [&str; 3] = ["std", "fs", "OpenOptions"];
+/// Preferably use the diagnostic item `sym::Option` where possible
+pub const OPTION: [&str; 3] = ["core", "option", "Option"];
+pub const OPTION_NONE: [&str; 4] = ["core", "option", "Option", "None"];
+pub const OPTION_SOME: [&str; 4] = ["core", "option", "Option", "Some"];
+pub const ORD: [&str; 3] = ["core", "cmp", "Ord"];
+pub const OS_STRING_AS_OS_STR: [&str; 5] = ["std", "ffi", "os_str", "OsString", "as_os_str"];
+pub const OS_STR_TO_OS_STRING: [&str; 5] = ["std", "ffi", "os_str", "OsStr", "to_os_string"];
+pub const PARKING_LOT_MUTEX_GUARD: [&str; 3] = ["lock_api", "mutex", "MutexGuard"];
+pub const PARKING_LOT_RWLOCK_READ_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockReadGuard"];
+pub const PARKING_LOT_RWLOCK_WRITE_GUARD: [&str; 3] = ["lock_api", "rwlock", "RwLockWriteGuard"];
+pub const PATH_BUF_AS_PATH: [&str; 4] = ["std", "path", "PathBuf", "as_path"];
+pub const PATH_TO_PATH_BUF: [&str; 4] = ["std", "path", "Path", "to_path_buf"];
+pub const PERMISSIONS: [&str; 3] = ["std", "fs", "Permissions"];
+#[cfg_attr(not(unix), allow(clippy::invalid_paths))]
+pub const PERMISSIONS_FROM_MODE: [&str; 6] = ["std", "os", "unix", "fs", "PermissionsExt", "from_mode"];
+pub const POLL: [&str; 4] = ["core", "task", "poll", "Poll"];
+pub const POLL_PENDING: [&str; 5] = ["core", "task", "poll", "Poll", "Pending"];
+pub const POLL_READY: [&str; 5] = ["core", "task", "poll", "Poll", "Ready"];
+pub const PTR_COPY: [&str; 3] = ["core", "intrinsics", "copy"];
+pub const PTR_COPY_NONOVERLAPPING: [&str; 3] = ["core", "intrinsics", "copy_nonoverlapping"];
+pub const PTR_EQ: [&str; 3] = ["core", "ptr", "eq"];
+pub const PTR_SLICE_FROM_RAW_PARTS: [&str; 3] = ["core", "ptr", "slice_from_raw_parts"];
+pub const PTR_SLICE_FROM_RAW_PARTS_MUT: [&str; 3] = ["core", "ptr", "slice_from_raw_parts_mut"];
+pub const PTR_SWAP_NONOVERLAPPING: [&str; 3] = ["core", "ptr", "swap_nonoverlapping"];
+pub const PTR_READ: [&str; 3] = ["core", "ptr", "read"];
+pub const PTR_READ_UNALIGNED: [&str; 3] = ["core", "ptr", "read_unaligned"];
+pub const PTR_READ_VOLATILE: [&str; 3] = ["core", "ptr", "read_volatile"];
+pub const PTR_REPLACE: [&str; 3] = ["core", "ptr", "replace"];
+pub const PTR_SWAP: [&str; 3] = ["core", "ptr", "swap"];
+pub const PTR_UNALIGNED_VOLATILE_LOAD: [&str; 3] = ["core", "intrinsics", "unaligned_volatile_load"];
+pub const PTR_UNALIGNED_VOLATILE_STORE: [&str; 3] = ["core", "intrinsics", "unaligned_volatile_store"];
+pub const PTR_WRITE: [&str; 3] = ["core", "ptr", "write"];
+pub const PTR_WRITE_BYTES: [&str; 3] = ["core", "intrinsics", "write_bytes"];
+pub const PTR_WRITE_UNALIGNED: [&str; 3] = ["core", "ptr", "write_unaligned"];
+pub const PTR_WRITE_VOLATILE: [&str; 3] = ["core", "ptr", "write_volatile"];
+pub const PUSH_STR: [&str; 4] = ["alloc", "string", "String", "push_str"];
+pub const RANGE_ARGUMENT_TRAIT: [&str; 3] = ["core", "ops", "RangeBounds"];
+pub const RC_PTR_EQ: [&str; 4] = ["alloc", "rc", "Rc", "ptr_eq"];
+pub const REFCELL_REF: [&str; 3] = ["core", "cell", "Ref"];
+pub const REFCELL_REFMUT: [&str; 3] = ["core", "cell", "RefMut"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "unicode", "RegexBuilder", "new"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_BUILDER_NEW: [&str; 5] = ["regex", "re_builder", "bytes", "RegexBuilder", "new"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_NEW: [&str; 4] = ["regex", "re_bytes", "Regex", "new"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_BYTES_SET_NEW: [&str; 5] = ["regex", "re_set", "bytes", "RegexSet", "new"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_NEW: [&str; 4] = ["regex", "re_unicode", "Regex", "new"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const REGEX_SET_NEW: [&str; 5] = ["regex", "re_set", "unicode", "RegexSet", "new"];
+/// Preferably use the diagnostic item `sym::Result` where possible
+pub const RESULT: [&str; 3] = ["core", "result", "Result"];
+pub const RESULT_ERR: [&str; 4] = ["core", "result", "Result", "Err"];
+pub const RESULT_OK: [&str; 4] = ["core", "result", "Result", "Ok"];
+#[cfg(feature = "internal")]
+pub const RUSTC_VERSION: [&str; 2] = ["rustc_semver", "RustcVersion"];
+pub const RWLOCK_READ_GUARD: [&str; 4] = ["std", "sync", "rwlock", "RwLockReadGuard"];
+pub const RWLOCK_WRITE_GUARD: [&str; 4] = ["std", "sync", "rwlock", "RwLockWriteGuard"];
+pub const SERDE_DESERIALIZE: [&str; 3] = ["serde", "de", "Deserialize"];
+pub const SERDE_DE_VISITOR: [&str; 3] = ["serde", "de", "Visitor"];
+pub const SLICE_FROM_RAW_PARTS: [&str; 4] = ["core", "slice", "raw", "from_raw_parts"];
+pub const SLICE_FROM_RAW_PARTS_MUT: [&str; 4] = ["core", "slice", "raw", "from_raw_parts_mut"];
+pub const SLICE_GET: [&str; 4] = ["core", "slice", "<impl [T]>", "get"];
+pub const SLICE_INTO_VEC: [&str; 4] = ["alloc", "slice", "<impl [T]>", "into_vec"];
+pub const SLICE_INTO: [&str; 4] = ["core", "slice", "<impl [T]>", "iter"];
+pub const SLICE_ITER: [&str; 4] = ["core", "slice", "iter", "Iter"];
+pub const STDERR: [&str; 4] = ["std", "io", "stdio", "stderr"];
+pub const STDOUT: [&str; 4] = ["std", "io", "stdio", "stdout"];
+pub const CONVERT_IDENTITY: [&str; 3] = ["core", "convert", "identity"];
+pub const STD_FS_CREATE_DIR: [&str; 3] = ["std", "fs", "create_dir"];
+pub const STRING_AS_MUT_STR: [&str; 4] = ["alloc", "string", "String", "as_mut_str"];
+pub const STRING_AS_STR: [&str; 4] = ["alloc", "string", "String", "as_str"];
+pub const STRING_NEW: [&str; 4] = ["alloc", "string", "String", "new"];
+pub const STR_BYTES: [&str; 4] = ["core", "str", "<impl str>", "bytes"];
+pub const STR_CHARS: [&str; 4] = ["core", "str", "<impl str>", "chars"];
+pub const STR_ENDS_WITH: [&str; 4] = ["core", "str", "<impl str>", "ends_with"];
+pub const STR_FROM_UTF8: [&str; 4] = ["core", "str", "converts", "from_utf8"];
+pub const STR_FROM_UTF8_UNCHECKED: [&str; 4] = ["core", "str", "converts", "from_utf8_unchecked"];
+pub const STR_LEN: [&str; 4] = ["core", "str", "<impl str>", "len"];
+pub const STR_STARTS_WITH: [&str; 4] = ["core", "str", "<impl str>", "starts_with"];
+#[cfg(feature = "internal")]
+pub const SYMBOL: [&str; 3] = ["rustc_span", "symbol", "Symbol"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_AS_STR: [&str; 4] = ["rustc_span", "symbol", "Symbol", "as_str"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_INTERN: [&str; 4] = ["rustc_span", "symbol", "Symbol", "intern"];
+#[cfg(feature = "internal")]
+pub const SYMBOL_TO_IDENT_STRING: [&str; 4] = ["rustc_span", "symbol", "Symbol", "to_ident_string"];
+#[cfg(feature = "internal")]
+pub const SYM_MODULE: [&str; 3] = ["rustc_span", "symbol", "sym"];
+#[cfg(feature = "internal")]
+pub const SYNTAX_CONTEXT: [&str; 3] = ["rustc_span", "hygiene", "SyntaxContext"];
+pub const TO_OWNED_METHOD: [&str; 4] = ["alloc", "borrow", "ToOwned", "to_owned"];
+pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const TOKIO_IO_ASYNCREADEXT: [&str; 5] = ["tokio", "io", "util", "async_read_ext", "AsyncReadExt"];
+#[expect(clippy::invalid_paths)] // internal lints do not know about all external crates
+pub const TOKIO_IO_ASYNCWRITEEXT: [&str; 5] = ["tokio", "io", "util", "async_write_ext", "AsyncWriteExt"];
+pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"];
+pub const VEC_AS_MUT_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_mut_slice"];
+pub const VEC_AS_SLICE: [&str; 4] = ["alloc", "vec", "Vec", "as_slice"];
+pub const VEC_DEQUE_ITER: [&str; 5] = ["alloc", "collections", "vec_deque", "VecDeque", "iter"];
+pub const VEC_FROM_ELEM: [&str; 3] = ["alloc", "vec", "from_elem"];
+pub const VEC_NEW: [&str; 4] = ["alloc", "vec", "Vec", "new"];
+pub const VEC_RESIZE: [&str; 4] = ["alloc", "vec", "Vec", "resize"];
+pub const WEAK_ARC: [&str; 3] = ["alloc", "sync", "Weak"];
+pub const WEAK_RC: [&str; 3] = ["alloc", "rc", "Weak"];
+pub const PTR_NON_NULL: [&str; 4] = ["core", "ptr", "non_null", "NonNull"];
++pub const INSTANT_NOW: [&str; 4] = ["std", "time", "Instant", "now"];
++pub const INSTANT: [&str; 3] = ["std", "time", "Instant"];
--- /dev/null
- /// Checks if the span starts with the given text. This will return false if the span crosses
- /// multiple files or if source is not available.
- ///
- /// This is used to check for proc macros giving unhelpful spans to things.
- pub fn span_starts_with<T: LintContext>(cx: &T, span: Span, text: &str) -> bool {
- fn helper(sm: &SourceMap, span: Span, text: &str) -> bool {
- let pos = sm.lookup_byte_offset(span.lo());
- let Some(ref src) = pos.sf.src else {
- return false;
- };
- let end = span.hi() - pos.sf.start_pos;
- src.get(pos.pos.0 as usize..end.0 as usize)
- // Expression spans can include wrapping parenthesis. Remove them first.
- .map_or(false, |s| s.trim_start_matches('(').starts_with(text))
- }
- helper(cx.sess().source_map(), span, text)
- }
-
+//! Utils for extracting, inspecting or transforming source code
+
+#![allow(clippy::module_name_repetitions)]
+
+use crate::line_span;
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind};
+use rustc_lint::{LateContext, LintContext};
+use rustc_span::hygiene;
+use rustc_span::source_map::SourceMap;
+use rustc_span::{BytePos, Pos, Span, SpanData, SyntaxContext};
+use std::borrow::Cow;
+
+/// Like `snippet_block`, but add braces if the expr is not an `ExprKind::Block`.
+/// Also takes an `Option<String>` which can be put inside the braces.
+pub fn expr_block<'a, T: LintContext>(
+ cx: &T,
+ expr: &Expr<'_>,
+ option: Option<String>,
+ default: &'a str,
+ indent_relative_to: Option<Span>,
+) -> Cow<'a, str> {
+ let code = snippet_block(cx, expr.span, default, indent_relative_to);
+ let string = option.unwrap_or_default();
+ if expr.span.from_expansion() {
+ Cow::Owned(format!("{{ {} }}", snippet_with_macro_callsite(cx, expr.span, default)))
+ } else if let ExprKind::Block(_, _) = expr.kind {
+ Cow::Owned(format!("{}{}", code, string))
+ } else if string.is_empty() {
+ Cow::Owned(format!("{{ {} }}", code))
+ } else {
+ Cow::Owned(format!("{{\n{};\n{}\n}}", code, string))
+ }
+}
+
+/// Returns a new Span that extends the original Span to the first non-whitespace char of the first
+/// line.
+///
+/// ```rust,ignore
+/// let x = ();
+/// // ^^
+/// // will be converted to
+/// let x = ();
+/// // ^^^^^^^^^^
+/// ```
+pub fn first_line_of_span<T: LintContext>(cx: &T, span: Span) -> Span {
+ first_char_in_first_line(cx, span).map_or(span, |first_char_pos| span.with_lo(first_char_pos))
+}
+
+fn first_char_in_first_line<T: LintContext>(cx: &T, span: Span) -> Option<BytePos> {
+ let line_span = line_span(cx, span);
+ snippet_opt(cx, line_span).and_then(|snip| {
+ snip.find(|c: char| !c.is_whitespace())
+ .map(|pos| line_span.lo() + BytePos::from_usize(pos))
+ })
+}
+
+/// Returns the indentation of the line of a span
+///
+/// ```rust,ignore
+/// let x = ();
+/// // ^^ -- will return 0
+/// let x = ();
+/// // ^^ -- will return 4
+/// ```
+pub fn indent_of<T: LintContext>(cx: &T, span: Span) -> Option<usize> {
+ snippet_opt(cx, line_span(cx, span)).and_then(|snip| snip.find(|c: char| !c.is_whitespace()))
+}
+
+/// Gets a snippet of the indentation of the line of a span
+pub fn snippet_indent<T: LintContext>(cx: &T, span: Span) -> Option<String> {
+ snippet_opt(cx, line_span(cx, span)).map(|mut s| {
+ let len = s.len() - s.trim_start().len();
+ s.truncate(len);
+ s
+ })
+}
+
+// If the snippet is empty, it's an attribute that was inserted during macro
+// expansion and we want to ignore those, because they could come from external
+// sources that the user has no control over.
+// For some reason these attributes don't have any expansion info on them, so
+// we have to check it this way until there is a better way.
+pub fn is_present_in_source<T: LintContext>(cx: &T, span: Span) -> bool {
+ if let Some(snippet) = snippet_opt(cx, span) {
+ if snippet.is_empty() {
+ return false;
+ }
+ }
+ true
+}
+
+/// Returns the position just before rarrow
+///
+/// ```rust,ignore
+/// fn into(self) -> () {}
+/// ^
+/// // in case of unformatted code
+/// fn into2(self)-> () {}
+/// ^
+/// fn into3(self) -> () {}
+/// ^
+/// ```
+pub fn position_before_rarrow(s: &str) -> Option<usize> {
+ s.rfind("->").map(|rpos| {
+ let mut rpos = rpos;
+ let chars: Vec<char> = s.chars().collect();
+ while rpos > 1 {
+ if let Some(c) = chars.get(rpos - 1) {
+ if c.is_whitespace() {
+ rpos -= 1;
+ continue;
+ }
+ }
+ break;
+ }
+ rpos
+ })
+}
+
+/// Reindent a multiline string with possibility of ignoring the first line.
+#[expect(clippy::needless_pass_by_value)]
+pub fn reindent_multiline(s: Cow<'_, str>, ignore_first: bool, indent: Option<usize>) -> Cow<'_, str> {
+ let s_space = reindent_multiline_inner(&s, ignore_first, indent, ' ');
+ let s_tab = reindent_multiline_inner(&s_space, ignore_first, indent, '\t');
+ reindent_multiline_inner(&s_tab, ignore_first, indent, ' ').into()
+}
+
+fn reindent_multiline_inner(s: &str, ignore_first: bool, indent: Option<usize>, ch: char) -> String {
+ let x = s
+ .lines()
+ .skip(usize::from(ignore_first))
+ .filter_map(|l| {
+ if l.is_empty() {
+ None
+ } else {
+ // ignore empty lines
+ Some(l.char_indices().find(|&(_, x)| x != ch).unwrap_or((l.len(), ch)).0)
+ }
+ })
+ .min()
+ .unwrap_or(0);
+ let indent = indent.unwrap_or(0);
+ s.lines()
+ .enumerate()
+ .map(|(i, l)| {
+ if (ignore_first && i == 0) || l.is_empty() {
+ l.to_owned()
+ } else if x > indent {
+ l.split_at(x - indent).1.to_owned()
+ } else {
+ " ".repeat(indent - x) + l
+ }
+ })
+ .collect::<Vec<String>>()
+ .join("\n")
+}
+
+/// Converts a span to a code snippet if available, otherwise returns the default.
+///
+/// This is useful if you want to provide suggestions for your lint or more generally, if you want
+/// to convert a given `Span` to a `str`. To create suggestions consider using
+/// [`snippet_with_applicability`] to ensure that the applicability stays correct.
+///
+/// # Example
+/// ```rust,ignore
+/// // Given two spans one for `value` and one for the `init` expression.
+/// let value = Vec::new();
+/// // ^^^^^ ^^^^^^^^^^
+/// // span1 span2
+///
+/// // The snipped call would return the corresponding code snippet
+/// snippet(cx, span1, "..") // -> "value"
+/// snippet(cx, span2, "..") // -> "Vec::new()"
+/// ```
+pub fn snippet<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
+ snippet_opt(cx, span).map_or_else(|| Cow::Borrowed(default), From::from)
+}
+
+/// Same as [`snippet`], but it adapts the applicability level by following rules:
+///
+/// - Applicability level `Unspecified` will never be changed.
+/// - If the span is inside a macro, change the applicability level to `MaybeIncorrect`.
+/// - If the default value is used and the applicability level is `MachineApplicable`, change it to
+/// `HasPlaceholders`
+pub fn snippet_with_applicability<'a, T: LintContext>(
+ cx: &T,
+ span: Span,
+ default: &'a str,
+ applicability: &mut Applicability,
+) -> Cow<'a, str> {
+ if *applicability != Applicability::Unspecified && span.from_expansion() {
+ *applicability = Applicability::MaybeIncorrect;
+ }
+ snippet_opt(cx, span).map_or_else(
+ || {
+ if *applicability == Applicability::MachineApplicable {
+ *applicability = Applicability::HasPlaceholders;
+ }
+ Cow::Borrowed(default)
+ },
+ From::from,
+ )
+}
+
+/// Same as `snippet`, but should only be used when it's clear that the input span is
+/// not a macro argument.
+pub fn snippet_with_macro_callsite<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
+ snippet(cx, span.source_callsite(), default)
+}
+
+/// Converts a span to a code snippet. Returns `None` if not available.
+pub fn snippet_opt<T: LintContext>(cx: &T, span: Span) -> Option<String> {
+ cx.sess().source_map().span_to_snippet(span).ok()
+}
+
+/// Converts a span (from a block) to a code snippet if available, otherwise use default.
+///
+/// This trims the code of indentation, except for the first line. Use it for blocks or block-like
+/// things which need to be printed as such.
+///
+/// The `indent_relative_to` arg can be used, to provide a span, where the indentation of the
+/// resulting snippet of the given span.
+///
+/// # Example
+///
+/// ```rust,ignore
+/// snippet_block(cx, block.span, "..", None)
+/// // where, `block` is the block of the if expr
+/// if x {
+/// y;
+/// }
+/// // will return the snippet
+/// {
+/// y;
+/// }
+/// ```
+///
+/// ```rust,ignore
+/// snippet_block(cx, block.span, "..", Some(if_expr.span))
+/// // where, `block` is the block of the if expr
+/// if x {
+/// y;
+/// }
+/// // will return the snippet
+/// {
+/// y;
+/// } // aligned with `if`
+/// ```
+/// Note that the first line of the snippet always has 0 indentation.
+pub fn snippet_block<'a, T: LintContext>(
+ cx: &T,
+ span: Span,
+ default: &'a str,
+ indent_relative_to: Option<Span>,
+) -> Cow<'a, str> {
+ let snip = snippet(cx, span, default);
+ let indent = indent_relative_to.and_then(|s| indent_of(cx, s));
+ reindent_multiline(snip, true, indent)
+}
+
+/// Same as `snippet_block`, but adapts the applicability level by the rules of
+/// `snippet_with_applicability`.
+pub fn snippet_block_with_applicability<'a, T: LintContext>(
+ cx: &T,
+ span: Span,
+ default: &'a str,
+ indent_relative_to: Option<Span>,
+ applicability: &mut Applicability,
+) -> Cow<'a, str> {
+ let snip = snippet_with_applicability(cx, span, default, applicability);
+ let indent = indent_relative_to.and_then(|s| indent_of(cx, s));
+ reindent_multiline(snip, true, indent)
+}
+
+/// Same as `snippet_with_applicability`, but first walks the span up to the given context. This
+/// will result in the macro call, rather then the expansion, if the span is from a child context.
+/// If the span is not from a child context, it will be used directly instead.
+///
+/// e.g. Given the expression `&vec![]`, getting a snippet from the span for `vec![]` as a HIR node
+/// would result in `box []`. If given the context of the address of expression, this function will
+/// correctly get a snippet of `vec![]`.
+///
+/// This will also return whether or not the snippet is a macro call.
+pub fn snippet_with_context<'a>(
+ cx: &LateContext<'_>,
+ span: Span,
+ outer: SyntaxContext,
+ default: &'a str,
+ applicability: &mut Applicability,
+) -> (Cow<'a, str>, bool) {
+ let (span, is_macro_call) = walk_span_to_context(span, outer).map_or_else(
+ || {
+ // The span is from a macro argument, and the outer context is the macro using the argument
+ if *applicability != Applicability::Unspecified {
+ *applicability = Applicability::MaybeIncorrect;
+ }
+ // TODO: get the argument span.
+ (span, false)
+ },
+ |outer_span| (outer_span, span.ctxt() != outer),
+ );
+
+ (
+ snippet_with_applicability(cx, span, default, applicability),
+ is_macro_call,
+ )
+}
+
+/// Walks the span up to the target context, thereby returning the macro call site if the span is
+/// inside a macro expansion, or the original span if it is not. Note this will return `None` in the
+/// case of the span being in a macro expansion, but the target context is from expanding a macro
+/// argument.
+///
+/// Given the following
+///
+/// ```rust,ignore
+/// macro_rules! m { ($e:expr) => { f($e) }; }
+/// g(m!(0))
+/// ```
+///
+/// If called with a span of the call to `f` and a context of the call to `g` this will return a
+/// span containing `m!(0)`. However, if called with a span of the literal `0` this will give a span
+/// containing `0` as the context is the same as the outer context.
+///
+/// This will traverse through multiple macro calls. Given the following:
+///
+/// ```rust,ignore
+/// macro_rules! m { ($e:expr) => { n!($e, 0) }; }
+/// macro_rules! n { ($e:expr, $f:expr) => { f($e, $f) }; }
+/// g(m!(0))
+/// ```
+///
+/// If called with a span of the call to `f` and a context of the call to `g` this will return a
+/// span containing `m!(0)`.
+pub fn walk_span_to_context(span: Span, outer: SyntaxContext) -> Option<Span> {
+ let outer_span = hygiene::walk_chain(span, outer);
+ (outer_span.ctxt() == outer).then_some(outer_span)
+}
+
+/// Removes block comments from the given `Vec` of lines.
+///
+/// # Examples
+///
+/// ```rust,ignore
+/// without_block_comments(vec!["/*", "foo", "*/"]);
+/// // => vec![]
+///
+/// without_block_comments(vec!["bar", "/*", "foo", "*/"]);
+/// // => vec!["bar"]
+/// ```
+pub fn without_block_comments(lines: Vec<&str>) -> Vec<&str> {
+ let mut without = vec![];
+
+ let mut nest_level = 0;
+
+ for line in lines {
+ if line.contains("/*") {
+ nest_level += 1;
+ continue;
+ } else if line.contains("*/") {
+ nest_level -= 1;
+ continue;
+ }
+
+ if nest_level == 0 {
+ without.push(line);
+ }
+ }
+
+ without
+}
+
+/// Trims the whitespace from the start and the end of the span.
+pub fn trim_span(sm: &SourceMap, span: Span) -> Span {
+ let data = span.data();
+ let sf: &_ = &sm.lookup_source_file(data.lo);
+ let Some(src) = sf.src.as_deref() else {
+ return span;
+ };
+ let Some(snip) = &src.get((data.lo - sf.start_pos).to_usize()..(data.hi - sf.start_pos).to_usize()) else {
+ return span;
+ };
+ let trim_start = snip.len() - snip.trim_start().len();
+ let trim_end = snip.len() - snip.trim_end().len();
+ SpanData {
+ lo: data.lo + BytePos::from_usize(trim_start),
+ hi: data.hi - BytePos::from_usize(trim_end),
+ ctxt: data.ctxt,
+ parent: data.parent,
+ }
+ .span()
+}
+
+#[cfg(test)]
+mod test {
+ use super::{reindent_multiline, without_block_comments};
+
+ #[test]
+ fn test_reindent_multiline_single_line() {
+ assert_eq!("", reindent_multiline("".into(), false, None));
+ assert_eq!("...", reindent_multiline("...".into(), false, None));
+ assert_eq!("...", reindent_multiline(" ...".into(), false, None));
+ assert_eq!("...", reindent_multiline("\t...".into(), false, None));
+ assert_eq!("...", reindent_multiline("\t\t...".into(), false, None));
+ }
+
+ #[test]
+ #[rustfmt::skip]
+ fn test_reindent_multiline_block() {
+ assert_eq!("\
+ if x {
+ y
+ } else {
+ z
+ }", reindent_multiline(" if x {
+ y
+ } else {
+ z
+ }".into(), false, None));
+ assert_eq!("\
+ if x {
+ \ty
+ } else {
+ \tz
+ }", reindent_multiline(" if x {
+ \ty
+ } else {
+ \tz
+ }".into(), false, None));
+ }
+
+ #[test]
+ #[rustfmt::skip]
+ fn test_reindent_multiline_empty_line() {
+ assert_eq!("\
+ if x {
+ y
+
+ } else {
+ z
+ }", reindent_multiline(" if x {
+ y
+
+ } else {
+ z
+ }".into(), false, None));
+ }
+
+ #[test]
+ #[rustfmt::skip]
+ fn test_reindent_multiline_lines_deeper() {
+ assert_eq!("\
+ if x {
+ y
+ } else {
+ z
+ }", reindent_multiline("\
+ if x {
+ y
+ } else {
+ z
+ }".into(), true, Some(8)));
+ }
+
+ #[test]
+ fn test_without_block_comments_lines_without_block_comments() {
+ let result = without_block_comments(vec!["/*", "", "*/"]);
+ println!("result: {:?}", result);
+ assert!(result.is_empty());
+
+ let result = without_block_comments(vec!["", "/*", "", "*/", "#[crate_type = \"lib\"]", "/*", "", "*/", ""]);
+ assert_eq!(result, vec!["", "#[crate_type = \"lib\"]", ""]);
+
+ let result = without_block_comments(vec!["/* rust", "", "*/"]);
+ assert!(result.is_empty());
+
+ let result = without_block_comments(vec!["/* one-line comment */"]);
+ assert!(result.is_empty());
+
+ let result = without_block_comments(vec!["/* nested", "/* multi-line", "comment", "*/", "test", "*/"]);
+ assert!(result.is_empty());
+
+ let result = without_block_comments(vec!["/* nested /* inline /* comment */ test */ */"]);
+ assert!(result.is_empty());
+
+ let result = without_block_comments(vec!["foo", "bar", "baz"]);
+ assert_eq!(result, vec!["foo", "bar", "baz"]);
+ }
+}
--- /dev/null
+//! Contains utility functions to generate suggestions.
+#![deny(clippy::missing_docs_in_private_items)]
+
+use crate::source::{snippet, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite};
+use crate::ty::expr_sig;
+use crate::{get_parent_expr_for_hir, higher};
+use rustc_ast::util::parser::AssocOp;
+use rustc_ast::{ast, token};
+use rustc_ast_pretty::pprust::token_kind_to_string;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::{Closure, ExprKind, HirId, MutTy, TyKind};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::{EarlyContext, LateContext, LintContext};
+use rustc_middle::hir::place::ProjectionKind;
+use rustc_middle::mir::{FakeReadCause, Mutability};
+use rustc_middle::ty;
+use rustc_span::source_map::{BytePos, CharPos, Pos, Span, SyntaxContext};
+use rustc_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
+use std::borrow::Cow;
+use std::fmt::{Display, Write as _};
+use std::ops::{Add, Neg, Not, Sub};
+
+/// A helper type to build suggestion correctly handling parentheses.
+#[derive(Clone, PartialEq)]
+pub enum Sugg<'a> {
+ /// An expression that never needs parentheses such as `1337` or `[0; 42]`.
+ NonParen(Cow<'a, str>),
+ /// An expression that does not fit in other variants.
+ MaybeParen(Cow<'a, str>),
+ /// A binary operator expression, including `as`-casts and explicit type
+ /// coercion.
+ BinOp(AssocOp, Cow<'a, str>, Cow<'a, str>),
+}
+
+/// Literal constant `0`, for convenience.
+pub const ZERO: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("0"));
+/// Literal constant `1`, for convenience.
+pub const ONE: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("1"));
+/// a constant represents an empty string, for convenience.
+pub const EMPTY: Sugg<'static> = Sugg::NonParen(Cow::Borrowed(""));
+
+impl Display for Sugg<'_> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ match *self {
+ Sugg::NonParen(ref s) | Sugg::MaybeParen(ref s) => s.fmt(f),
+ Sugg::BinOp(op, ref lhs, ref rhs) => binop_to_string(op, lhs, rhs).fmt(f),
+ }
+ }
+}
+
+#[expect(clippy::wrong_self_convention)] // ok, because of the function `as_ty` method
+impl<'a> Sugg<'a> {
+ /// Prepare a suggestion from an expression.
+ pub fn hir_opt(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Self> {
+ let get_snippet = |span| snippet(cx, span, "");
+ snippet_opt(cx, expr.span).map(|_| Self::hir_from_snippet(expr, get_snippet))
+ }
+
+ /// Convenience function around `hir_opt` for suggestions with a default
+ /// text.
+ pub fn hir(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ Self::hir_opt(cx, expr).unwrap_or(Sugg::NonParen(Cow::Borrowed(default)))
+ }
+
+ /// Same as `hir`, but it adapts the applicability level by following rules:
+ ///
+ /// - Applicability level `Unspecified` will never be changed.
+ /// - If the span is inside a macro, change the applicability level to `MaybeIncorrect`.
+ /// - If the default value is used and the applicability level is `MachineApplicable`, change it
+ /// to
+ /// `HasPlaceholders`
+ pub fn hir_with_applicability(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if *applicability != Applicability::Unspecified && expr.span.from_expansion() {
+ *applicability = Applicability::MaybeIncorrect;
+ }
+ Self::hir_opt(cx, expr).unwrap_or_else(|| {
+ if *applicability == Applicability::MachineApplicable {
+ *applicability = Applicability::HasPlaceholders;
+ }
+ Sugg::NonParen(Cow::Borrowed(default))
+ })
+ }
+
+ /// Same as `hir`, but will use the pre expansion span if the `expr` was in a macro.
+ pub fn hir_with_macro_callsite(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ let get_snippet = |span| snippet_with_macro_callsite(cx, span, default);
+ Self::hir_from_snippet(expr, get_snippet)
+ }
+
+ /// Same as `hir`, but first walks the span up to the given context. This will result in the
+ /// macro call, rather then the expansion, if the span is from a child context. If the span is
+ /// not from a child context, it will be used directly instead.
+ ///
+ /// e.g. Given the expression `&vec![]`, getting a snippet from the span for `vec![]` as a HIR
+ /// node would result in `box []`. If given the context of the address of expression, this
+ /// function will correctly get a snippet of `vec![]`.
+ pub fn hir_with_context(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ ctxt: SyntaxContext,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if expr.span.ctxt() == ctxt {
+ Self::hir_from_snippet(expr, |span| snippet(cx, span, default))
+ } else {
+ let snip = snippet_with_applicability(cx, expr.span, default, applicability);
+ Sugg::NonParen(snip)
+ }
+ }
+
+ /// Generate a suggestion for an expression with the given snippet. This is used by the `hir_*`
+ /// function variants of `Sugg`, since these use different snippet functions.
+ fn hir_from_snippet(expr: &hir::Expr<'_>, get_snippet: impl Fn(Span) -> Cow<'a, str>) -> Self {
+ if let Some(range) = higher::Range::hir(expr) {
+ let op = match range.limits {
+ ast::RangeLimits::HalfOpen => AssocOp::DotDot,
+ ast::RangeLimits::Closed => AssocOp::DotDotEq,
+ };
+ let start = range.start.map_or("".into(), |expr| get_snippet(expr.span));
+ let end = range.end.map_or("".into(), |expr| get_snippet(expr.span));
+
+ return Sugg::BinOp(op, start, end);
+ }
+
+ match expr.kind {
+ hir::ExprKind::AddrOf(..)
+ | hir::ExprKind::Box(..)
+ | hir::ExprKind::If(..)
+ | hir::ExprKind::Let(..)
+ | hir::ExprKind::Closure { .. }
+ | hir::ExprKind::Unary(..)
+ | hir::ExprKind::Match(..) => Sugg::MaybeParen(get_snippet(expr.span)),
+ hir::ExprKind::Continue(..)
+ | hir::ExprKind::Yield(..)
+ | hir::ExprKind::Array(..)
+ | hir::ExprKind::Block(..)
+ | hir::ExprKind::Break(..)
+ | hir::ExprKind::Call(..)
+ | hir::ExprKind::Field(..)
+ | hir::ExprKind::Index(..)
+ | hir::ExprKind::InlineAsm(..)
+ | hir::ExprKind::ConstBlock(..)
+ | hir::ExprKind::Lit(..)
+ | hir::ExprKind::Loop(..)
+ | hir::ExprKind::MethodCall(..)
+ | hir::ExprKind::Path(..)
+ | hir::ExprKind::Repeat(..)
+ | hir::ExprKind::Ret(..)
+ | hir::ExprKind::Struct(..)
+ | hir::ExprKind::Tup(..)
+ | hir::ExprKind::DropTemps(_)
+ | hir::ExprKind::Err => Sugg::NonParen(get_snippet(expr.span)),
+ hir::ExprKind::Assign(lhs, rhs, _) => {
+ Sugg::BinOp(AssocOp::Assign, get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::AssignOp(op, lhs, rhs) => {
+ Sugg::BinOp(hirbinop2assignop(op), get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node.into()),
+ get_snippet(lhs.span),
+ get_snippet(rhs.span),
+ ),
+ hir::ExprKind::Cast(lhs, ty) => Sugg::BinOp(AssocOp::As, get_snippet(lhs.span), get_snippet(ty.span)),
+ hir::ExprKind::Type(lhs, ty) => Sugg::BinOp(AssocOp::Colon, get_snippet(lhs.span), get_snippet(ty.span)),
+ }
+ }
+
+ /// Prepare a suggestion from an expression.
+ pub fn ast(cx: &EarlyContext<'_>, expr: &ast::Expr, default: &'a str) -> Self {
+ use rustc_ast::ast::RangeLimits;
+
+ let get_whole_snippet = || {
+ if expr.span.from_expansion() {
+ snippet_with_macro_callsite(cx, expr.span, default)
+ } else {
+ snippet(cx, expr.span, default)
+ }
+ };
+
+ match expr.kind {
+ ast::ExprKind::AddrOf(..)
+ | ast::ExprKind::Box(..)
+ | ast::ExprKind::Closure { .. }
+ | ast::ExprKind::If(..)
+ | ast::ExprKind::Let(..)
+ | ast::ExprKind::Unary(..)
+ | ast::ExprKind::Match(..) => Sugg::MaybeParen(get_whole_snippet()),
+ ast::ExprKind::Async(..)
+ | ast::ExprKind::Block(..)
+ | ast::ExprKind::Break(..)
+ | ast::ExprKind::Call(..)
+ | ast::ExprKind::Continue(..)
+ | ast::ExprKind::Yield(..)
+ | ast::ExprKind::Field(..)
+ | ast::ExprKind::ForLoop(..)
+ | ast::ExprKind::Index(..)
+ | ast::ExprKind::InlineAsm(..)
+ | ast::ExprKind::ConstBlock(..)
+ | ast::ExprKind::Lit(..)
+ | ast::ExprKind::Loop(..)
+ | ast::ExprKind::MacCall(..)
+ | ast::ExprKind::MethodCall(..)
+ | ast::ExprKind::Paren(..)
+ | ast::ExprKind::Underscore
+ | ast::ExprKind::Path(..)
+ | ast::ExprKind::Repeat(..)
+ | ast::ExprKind::Ret(..)
+ | ast::ExprKind::Yeet(..)
+ | ast::ExprKind::Struct(..)
+ | ast::ExprKind::Try(..)
+ | ast::ExprKind::TryBlock(..)
+ | ast::ExprKind::Tup(..)
+ | ast::ExprKind::Array(..)
+ | ast::ExprKind::While(..)
+ | ast::ExprKind::Await(..)
+ | ast::ExprKind::Err => Sugg::NonParen(get_whole_snippet()),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::HalfOpen) => Sugg::BinOp(
+ AssocOp::DotDot,
+ lhs.as_ref().map_or("".into(), |lhs| snippet(cx, lhs.span, default)),
+ rhs.as_ref().map_or("".into(), |rhs| snippet(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::Closed) => Sugg::BinOp(
+ AssocOp::DotDotEq,
+ lhs.as_ref().map_or("".into(), |lhs| snippet(cx, lhs.span, default)),
+ rhs.as_ref().map_or("".into(), |rhs| snippet(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Assign(ref lhs, ref rhs, _) => Sugg::BinOp(
+ AssocOp::Assign,
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => Sugg::BinOp(
+ astbinop2assignop(op),
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Binary(op, ref lhs, ref rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node),
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Cast(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::As,
+ snippet(cx, lhs.span, default),
+ snippet(cx, ty.span, default),
+ ),
+ ast::ExprKind::Type(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::Colon,
+ snippet(cx, lhs.span, default),
+ snippet(cx, ty.span, default),
+ ),
+ }
+ }
+
+ /// Convenience method to create the `<lhs> && <rhs>` suggestion.
+ pub fn and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::And, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> & <rhs>` suggestion.
+ pub fn bit_and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::BitAnd, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> as <rhs>` suggestion.
+ pub fn as_ty<R: Display>(self, rhs: R) -> Sugg<'static> {
+ make_assoc(AssocOp::As, &self, &Sugg::NonParen(rhs.to_string().into()))
+ }
+
+ /// Convenience method to create the `&<expr>` suggestion.
+ pub fn addr(self) -> Sugg<'static> {
+ make_unop("&", self)
+ }
+
+ /// Convenience method to create the `&mut <expr>` suggestion.
+ pub fn mut_addr(self) -> Sugg<'static> {
+ make_unop("&mut ", self)
+ }
+
+ /// Convenience method to create the `*<expr>` suggestion.
+ pub fn deref(self) -> Sugg<'static> {
+ make_unop("*", self)
+ }
+
+ /// Convenience method to create the `&*<expr>` suggestion. Currently this
+ /// is needed because `sugg.deref().addr()` produces an unnecessary set of
+ /// parentheses around the deref.
+ pub fn addr_deref(self) -> Sugg<'static> {
+ make_unop("&*", self)
+ }
+
+ /// Convenience method to create the `&mut *<expr>` suggestion. Currently
+ /// this is needed because `sugg.deref().mut_addr()` produces an unnecessary
+ /// set of parentheses around the deref.
+ pub fn mut_addr_deref(self) -> Sugg<'static> {
+ make_unop("&mut *", self)
+ }
+
+ /// Convenience method to transform suggestion into a return call
+ pub fn make_return(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("return {}", self)))
+ }
+
+ /// Convenience method to transform suggestion into a block
+ /// where the suggestion is a trailing expression
+ pub fn blockify(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("{{ {} }}", self)))
+ }
+
++ /// Convenience method to prefix the expression with the `async` keyword.
++ /// Can be used after `blockify` to create an async block.
++ pub fn asyncify(self) -> Sugg<'static> {
++ Sugg::NonParen(Cow::Owned(format!("async {}", self)))
++ }
++
+ /// Convenience method to create the `<lhs>..<rhs>` or `<lhs>...<rhs>`
+ /// suggestion.
+ pub fn range(self, end: &Self, limit: ast::RangeLimits) -> Sugg<'static> {
+ match limit {
+ ast::RangeLimits::HalfOpen => make_assoc(AssocOp::DotDot, &self, end),
+ ast::RangeLimits::Closed => make_assoc(AssocOp::DotDotEq, &self, end),
+ }
+ }
+
+ /// Adds parentheses to any expression that might need them. Suitable to the
+ /// `self` argument of a method call
+ /// (e.g., to build `bar.foo()` or `(1 + 2).foo()`).
+ #[must_use]
+ pub fn maybe_par(self) -> Self {
+ match self {
+ Sugg::NonParen(..) => self,
+ // `(x)` and `(x).y()` both don't need additional parens.
+ Sugg::MaybeParen(sugg) => {
+ if has_enclosing_paren(&sugg) {
+ Sugg::MaybeParen(sugg)
+ } else {
+ Sugg::NonParen(format!("({})", sugg).into())
+ }
+ },
+ Sugg::BinOp(op, lhs, rhs) => {
+ let sugg = binop_to_string(op, &lhs, &rhs);
+ Sugg::NonParen(format!("({})", sugg).into())
+ },
+ }
+ }
+}
+
+/// Generates a string from the operator and both sides.
+fn binop_to_string(op: AssocOp, lhs: &str, rhs: &str) -> String {
+ match op {
+ AssocOp::Add
+ | AssocOp::Subtract
+ | AssocOp::Multiply
+ | AssocOp::Divide
+ | AssocOp::Modulus
+ | AssocOp::LAnd
+ | AssocOp::LOr
+ | AssocOp::BitXor
+ | AssocOp::BitAnd
+ | AssocOp::BitOr
+ | AssocOp::ShiftLeft
+ | AssocOp::ShiftRight
+ | AssocOp::Equal
+ | AssocOp::Less
+ | AssocOp::LessEqual
+ | AssocOp::NotEqual
+ | AssocOp::Greater
+ | AssocOp::GreaterEqual => format!(
+ "{} {} {}",
+ lhs,
+ op.to_ast_binop().expect("Those are AST ops").to_string(),
+ rhs
+ ),
+ AssocOp::Assign => format!("{} = {}", lhs, rhs),
+ AssocOp::AssignOp(op) => {
+ format!("{} {}= {}", lhs, token_kind_to_string(&token::BinOp(op)), rhs)
+ },
+ AssocOp::As => format!("{} as {}", lhs, rhs),
+ AssocOp::DotDot => format!("{}..{}", lhs, rhs),
+ AssocOp::DotDotEq => format!("{}..={}", lhs, rhs),
+ AssocOp::Colon => format!("{}: {}", lhs, rhs),
+ }
+}
+
+/// Return `true` if `sugg` is enclosed in parenthesis.
+pub fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
+ let mut chars = sugg.as_ref().chars();
+ if chars.next() == Some('(') {
+ let mut depth = 1;
+ for c in &mut chars {
+ if c == '(' {
+ depth += 1;
+ } else if c == ')' {
+ depth -= 1;
+ }
+ if depth == 0 {
+ break;
+ }
+ }
+ chars.next().is_none()
+ } else {
+ false
+ }
+}
+
+/// Copied from the rust standard library, and then edited
+macro_rules! forward_binop_impls_to_ref {
+ (impl $imp:ident, $method:ident for $t:ty, type Output = $o:ty) => {
+ impl $imp<$t> for &$t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(self, &other)
+ }
+ }
+
+ impl $imp<&$t> for $t {
+ type Output = $o;
+
+ fn $method(self, other: &$t) -> $o {
+ $imp::$method(&self, other)
+ }
+ }
+
+ impl $imp for $t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(&self, &other)
+ }
+ }
+ };
+}
+
+impl Add for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn add(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Add, self, rhs)
+ }
+}
+
+impl Sub for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn sub(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Sub, self, rhs)
+ }
+}
+
+forward_binop_impls_to_ref!(impl Add, add for Sugg<'_>, type Output = Sugg<'static>);
+forward_binop_impls_to_ref!(impl Sub, sub for Sugg<'_>, type Output = Sugg<'static>);
+
+impl Neg for Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn neg(self) -> Sugg<'static> {
+ make_unop("-", self)
+ }
+}
+
+impl<'a> Not for Sugg<'a> {
+ type Output = Sugg<'a>;
+ fn not(self) -> Sugg<'a> {
+ use AssocOp::{Equal, Greater, GreaterEqual, Less, LessEqual, NotEqual};
+
+ if let Sugg::BinOp(op, lhs, rhs) = self {
+ let to_op = match op {
+ Equal => NotEqual,
+ NotEqual => Equal,
+ Less => GreaterEqual,
+ GreaterEqual => Less,
+ Greater => LessEqual,
+ LessEqual => Greater,
+ _ => return make_unop("!", Sugg::BinOp(op, lhs, rhs)),
+ };
+ Sugg::BinOp(to_op, lhs, rhs)
+ } else {
+ make_unop("!", self)
+ }
+ }
+}
+
+/// Helper type to display either `foo` or `(foo)`.
+struct ParenHelper<T> {
+ /// `true` if parentheses are needed.
+ paren: bool,
+ /// The main thing to display.
+ wrapped: T,
+}
+
+impl<T> ParenHelper<T> {
+ /// Builds a `ParenHelper`.
+ fn new(paren: bool, wrapped: T) -> Self {
+ Self { paren, wrapped }
+ }
+}
+
+impl<T: Display> Display for ParenHelper<T> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ if self.paren {
+ write!(f, "({})", self.wrapped)
+ } else {
+ self.wrapped.fmt(f)
+ }
+ }
+}
+
+/// Builds the string for `<op><expr>` adding parenthesis when necessary.
+///
+/// For convenience, the operator is taken as a string because all unary
+/// operators have the same
+/// precedence.
+pub fn make_unop(op: &str, expr: Sugg<'_>) -> Sugg<'static> {
+ Sugg::MaybeParen(format!("{}{}", op, expr.maybe_par()).into())
+}
+
+/// Builds the string for `<lhs> <op> <rhs>` adding parenthesis when necessary.
+///
+/// Precedence of shift operator relative to other arithmetic operation is
+/// often confusing so
+/// parenthesis will always be added for a mix of these.
+pub fn make_assoc(op: AssocOp, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ /// Returns `true` if the operator is a shift operator `<<` or `>>`.
+ fn is_shift(op: AssocOp) -> bool {
+ matches!(op, AssocOp::ShiftLeft | AssocOp::ShiftRight)
+ }
+
+ /// Returns `true` if the operator is an arithmetic operator
+ /// (i.e., `+`, `-`, `*`, `/`, `%`).
+ fn is_arith(op: AssocOp) -> bool {
+ matches!(
+ op,
+ AssocOp::Add | AssocOp::Subtract | AssocOp::Multiply | AssocOp::Divide | AssocOp::Modulus
+ )
+ }
+
+ /// Returns `true` if the operator `op` needs parenthesis with the operator
+ /// `other` in the direction `dir`.
+ fn needs_paren(op: AssocOp, other: AssocOp, dir: Associativity) -> bool {
+ other.precedence() < op.precedence()
+ || (other.precedence() == op.precedence()
+ && ((op != other && associativity(op) != dir)
+ || (op == other && associativity(op) != Associativity::Both)))
+ || is_shift(op) && is_arith(other)
+ || is_shift(other) && is_arith(op)
+ }
+
+ let lhs_paren = if let Sugg::BinOp(lop, _, _) = *lhs {
+ needs_paren(op, lop, Associativity::Left)
+ } else {
+ false
+ };
+
+ let rhs_paren = if let Sugg::BinOp(rop, _, _) = *rhs {
+ needs_paren(op, rop, Associativity::Right)
+ } else {
+ false
+ };
+
+ let lhs = ParenHelper::new(lhs_paren, lhs).to_string();
+ let rhs = ParenHelper::new(rhs_paren, rhs).to_string();
+ Sugg::BinOp(op, lhs.into(), rhs.into())
+}
+
+/// Convenience wrapper around `make_assoc` and `AssocOp::from_ast_binop`.
+pub fn make_binop(op: ast::BinOpKind, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_assoc(AssocOp::from_ast_binop(op), lhs, rhs)
+}
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+/// Operator associativity.
+enum Associativity {
+ /// The operator is both left-associative and right-associative.
+ Both,
+ /// The operator is left-associative.
+ Left,
+ /// The operator is not associative.
+ None,
+ /// The operator is right-associative.
+ Right,
+}
+
+/// Returns the associativity/fixity of an operator. The difference with
+/// `AssocOp::fixity` is that an operator can be both left and right associative
+/// (such as `+`: `a + b + c == (a + b) + c == a + (b + c)`.
+///
+/// Chained `as` and explicit `:` type coercion never need inner parenthesis so
+/// they are considered
+/// associative.
+#[must_use]
+fn associativity(op: AssocOp) -> Associativity {
+ use rustc_ast::util::parser::AssocOp::{
+ Add, As, Assign, AssignOp, BitAnd, BitOr, BitXor, Colon, Divide, DotDot, DotDotEq, Equal, Greater,
+ GreaterEqual, LAnd, LOr, Less, LessEqual, Modulus, Multiply, NotEqual, ShiftLeft, ShiftRight, Subtract,
+ };
+
+ match op {
+ Assign | AssignOp(_) => Associativity::Right,
+ Add | BitAnd | BitOr | BitXor | LAnd | LOr | Multiply | As | Colon => Associativity::Both,
+ Divide | Equal | Greater | GreaterEqual | Less | LessEqual | Modulus | NotEqual | ShiftLeft | ShiftRight
+ | Subtract => Associativity::Left,
+ DotDot | DotDotEq => Associativity::None,
+ }
+}
+
+/// Converts a `hir::BinOp` to the corresponding assigning binary operator.
+fn hirbinop2assignop(op: hir::BinOp) -> AssocOp {
+ use rustc_ast::token::BinOpToken::{And, Caret, Minus, Or, Percent, Plus, Shl, Shr, Slash, Star};
+
+ AssocOp::AssignOp(match op.node {
+ hir::BinOpKind::Add => Plus,
+ hir::BinOpKind::BitAnd => And,
+ hir::BinOpKind::BitOr => Or,
+ hir::BinOpKind::BitXor => Caret,
+ hir::BinOpKind::Div => Slash,
+ hir::BinOpKind::Mul => Star,
+ hir::BinOpKind::Rem => Percent,
+ hir::BinOpKind::Shl => Shl,
+ hir::BinOpKind::Shr => Shr,
+ hir::BinOpKind::Sub => Minus,
+
+ hir::BinOpKind::And
+ | hir::BinOpKind::Eq
+ | hir::BinOpKind::Ge
+ | hir::BinOpKind::Gt
+ | hir::BinOpKind::Le
+ | hir::BinOpKind::Lt
+ | hir::BinOpKind::Ne
+ | hir::BinOpKind::Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Converts an `ast::BinOp` to the corresponding assigning binary operator.
+fn astbinop2assignop(op: ast::BinOp) -> AssocOp {
+ use rustc_ast::ast::BinOpKind::{
+ Add, And, BitAnd, BitOr, BitXor, Div, Eq, Ge, Gt, Le, Lt, Mul, Ne, Or, Rem, Shl, Shr, Sub,
+ };
+ use rustc_ast::token::BinOpToken;
+
+ AssocOp::AssignOp(match op.node {
+ Add => BinOpToken::Plus,
+ BitAnd => BinOpToken::And,
+ BitOr => BinOpToken::Or,
+ BitXor => BinOpToken::Caret,
+ Div => BinOpToken::Slash,
+ Mul => BinOpToken::Star,
+ Rem => BinOpToken::Percent,
+ Shl => BinOpToken::Shl,
+ Shr => BinOpToken::Shr,
+ Sub => BinOpToken::Minus,
+ And | Eq | Ge | Gt | Le | Lt | Ne | Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Returns the indentation before `span` if there are nothing but `[ \t]`
+/// before it on its line.
+fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> {
+ let lo = cx.sess().source_map().lookup_char_pos(span.lo());
+ lo.file
+ .get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */)
+ .and_then(|line| {
+ if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') {
+ // We can mix char and byte positions here because we only consider `[ \t]`.
+ if lo.col == CharPos(pos) {
+ Some(line[..pos].into())
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ })
+}
+
+/// Convenience extension trait for `Diagnostic`.
+pub trait DiagnosticExt<T: LintContext> {
+ /// Suggests to add an attribute to an item.
+ ///
+ /// Correctly handles indentation of the attribute and item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_item_with_attr(cx, item, "#[derive(Default)]");
+ /// ```
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ );
+
+ /// Suggest to add an item before another.
+ ///
+ /// The item should not be indented (except for inner indentation).
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_prepend_item(cx, item,
+ /// "fn foo() {
+ /// bar();
+ /// }");
+ /// ```
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability);
+
+ /// Suggest to completely remove an item.
+ ///
+ /// This will remove an item and all following whitespace until the next non-whitespace
+ /// character. This should work correctly if item is on the same indentation level as the
+ /// following item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_remove_item(cx, item, "remove this")
+ /// ```
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability);
+}
+
+impl<T: LintContext> DiagnosticExt<T> for rustc_errors::Diagnostic {
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ ) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ self.span_suggestion(span, msg, format!("{}\n{}", attr, indent), applicability);
+ }
+ }
+
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ let mut first = true;
+ let new_item = new_item
+ .lines()
+ .map(|l| {
+ if first {
+ first = false;
+ format!("{}\n", l)
+ } else {
+ format!("{}{}\n", indent, l)
+ }
+ })
+ .collect::<String>();
+
+ self.span_suggestion(span, msg, format!("{}\n{}", new_item, indent), applicability);
+ }
+ }
+
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability) {
+ let mut remove_span = item;
+ let hi = cx.sess().source_map().next_point(remove_span).hi();
+ let fmpos = cx.sess().source_map().lookup_byte_offset(hi);
+
+ if let Some(ref src) = fmpos.sf.src {
+ let non_whitespace_offset = src[fmpos.pos.to_usize()..].find(|c| c != ' ' && c != '\t' && c != '\n');
+
+ if let Some(non_whitespace_offset) = non_whitespace_offset {
+ remove_span = remove_span
+ .with_hi(remove_span.hi() + BytePos(non_whitespace_offset.try_into().expect("offset too large")));
+ }
+ }
+
+ self.span_suggestion(remove_span, msg, "", applicability);
+ }
+}
+
+/// Suggestion results for handling closure
+/// args dereferencing and borrowing
+pub struct DerefClosure {
+ /// confidence on the built suggestion
+ pub applicability: Applicability,
+ /// gradually built suggestion
+ pub suggestion: String,
+}
+
+/// Build suggestion gradually by handling closure arg specific usages,
+/// such as explicit deref and borrowing cases.
+/// Returns `None` if no such use cases have been triggered in closure body
+///
+/// note: this only works on single line immutable closures with exactly one input parameter.
+pub fn deref_closure_args<'tcx>(cx: &LateContext<'_>, closure: &'tcx hir::Expr<'_>) -> Option<DerefClosure> {
+ if let hir::ExprKind::Closure(&Closure { fn_decl, body, .. }) = closure.kind {
+ let closure_body = cx.tcx.hir().body(body);
+ // is closure arg a type annotated double reference (i.e.: `|x: &&i32| ...`)
+ // a type annotation is present if param `kind` is different from `TyKind::Infer`
+ let closure_arg_is_type_annotated_double_ref = if let TyKind::Rptr(_, MutTy { ty, .. }) = fn_decl.inputs[0].kind
+ {
+ matches!(ty.kind, TyKind::Rptr(_, MutTy { .. }))
+ } else {
+ false
+ };
+
+ let mut visitor = DerefDelegate {
+ cx,
+ closure_span: closure.span,
+ closure_arg_is_type_annotated_double_ref,
+ next_pos: closure.span.lo(),
+ suggestion_start: String::new(),
+ applicability: Applicability::MachineApplicable,
+ };
+
+ let fn_def_id = cx.tcx.hir().local_def_id(closure.hir_id);
+ cx.tcx.infer_ctxt().enter(|infcx| {
+ ExprUseVisitor::new(&mut visitor, &infcx, fn_def_id, cx.param_env, cx.typeck_results())
+ .consume_body(closure_body);
+ });
+
+ if !visitor.suggestion_start.is_empty() {
+ return Some(DerefClosure {
+ applicability: visitor.applicability,
+ suggestion: visitor.finish(),
+ });
+ }
+ }
+ None
+}
+
+/// Visitor struct used for tracking down
+/// dereferencing and borrowing of closure's args
+struct DerefDelegate<'a, 'tcx> {
+ /// The late context of the lint
+ cx: &'a LateContext<'tcx>,
+ /// The span of the input closure to adapt
+ closure_span: Span,
+ /// Indicates if the arg of the closure is a type annotated double reference
+ closure_arg_is_type_annotated_double_ref: bool,
+ /// last position of the span to gradually build the suggestion
+ next_pos: BytePos,
+ /// starting part of the gradually built suggestion
+ suggestion_start: String,
+ /// confidence on the built suggestion
+ applicability: Applicability,
+}
+
+impl<'tcx> DerefDelegate<'_, 'tcx> {
+ /// build final suggestion:
+ /// - create the ending part of suggestion
+ /// - concatenate starting and ending parts
+ /// - potentially remove needless borrowing
+ pub fn finish(&mut self) -> String {
+ let end_span = Span::new(self.next_pos, self.closure_span.hi(), self.closure_span.ctxt(), None);
+ let end_snip = snippet_with_applicability(self.cx, end_span, "..", &mut self.applicability);
+ let sugg = format!("{}{}", self.suggestion_start, end_snip);
+ if self.closure_arg_is_type_annotated_double_ref {
+ sugg.replacen('&', "", 1)
+ } else {
+ sugg
+ }
+ }
+
+ /// indicates whether the function from `parent_expr` takes its args by double reference
+ fn func_takes_arg_by_double_ref(&self, parent_expr: &'tcx hir::Expr<'_>, cmt_hir_id: HirId) -> bool {
+ let ty = match parent_expr.kind {
+ ExprKind::MethodCall(_, call_args, _) => {
+ if let Some(sig) = self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(parent_expr.hir_id)
+ .map(|did| self.cx.tcx.fn_sig(did).skip_binder())
+ {
+ call_args
+ .iter()
+ .position(|arg| arg.hir_id == cmt_hir_id)
+ .map(|i| sig.inputs()[i])
+ } else {
+ return false;
+ }
+ },
+ ExprKind::Call(func, call_args) => {
+ if let Some(sig) = expr_sig(self.cx, func) {
+ call_args
+ .iter()
+ .position(|arg| arg.hir_id == cmt_hir_id)
+ .and_then(|i| sig.input(i))
+ .map(ty::Binder::skip_binder)
+ } else {
+ return false;
+ }
+ },
+ _ => return false,
+ };
+
+ ty.map_or(false, |ty| matches!(ty.kind(), ty::Ref(_, inner, _) if inner.is_ref()))
+ }
+}
+
+impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
+ fn consume(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
+ fn borrow(&mut self, cmt: &PlaceWithHirId<'tcx>, _: HirId, _: ty::BorrowKind) {
+ if let PlaceBase::Local(id) = cmt.place.base {
+ let map = self.cx.tcx.hir();
+ let span = map.span(cmt.hir_id);
+ let start_span = Span::new(self.next_pos, span.lo(), span.ctxt(), None);
+ let mut start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+
+ // identifier referring to the variable currently triggered (i.e.: `fp`)
+ let ident_str = map.name(id).to_string();
+ // full identifier that includes projection (i.e.: `fp.field`)
+ let ident_str_with_proj = snippet(self.cx, span, "..").to_string();
+
+ if cmt.place.projections.is_empty() {
+ // handle item without any projection, that needs an explicit borrowing
+ // i.e.: suggest `&x` instead of `x`
+ let _ = write!(self.suggestion_start, "{}&{}", start_snip, ident_str);
+ } else {
+ // cases where a parent `Call` or `MethodCall` is using the item
+ // i.e.: suggest `.contains(&x)` for `.find(|x| [1, 2, 3].contains(x)).is_none()`
+ //
+ // Note about method calls:
+ // - compiler automatically dereference references if the target type is a reference (works also for
+ // function call)
+ // - `self` arguments in the case of `x.is_something()` are also automatically (de)referenced, and
+ // no projection should be suggested
+ if let Some(parent_expr) = get_parent_expr_for_hir(self.cx, cmt.hir_id) {
+ match &parent_expr.kind {
+ // given expression is the self argument and will be handled completely by the compiler
+ // i.e.: `|x| x.is_something()`
+ ExprKind::MethodCall(_, [self_expr, ..], _) if self_expr.hir_id == cmt.hir_id => {
+ let _ = write!(self.suggestion_start, "{}{}", start_snip, ident_str_with_proj);
+ self.next_pos = span.hi();
+ return;
+ },
+ // item is used in a call
+ // i.e.: `Call`: `|x| please(x)` or `MethodCall`: `|x| [1, 2, 3].contains(x)`
+ ExprKind::Call(_, [call_args @ ..]) | ExprKind::MethodCall(_, [_, call_args @ ..], _) => {
+ let expr = self.cx.tcx.hir().expect_expr(cmt.hir_id);
+ let arg_ty_kind = self.cx.typeck_results().expr_ty(expr).kind();
+
+ if matches!(arg_ty_kind, ty::Ref(_, _, Mutability::Not)) {
+ // suggest ampersand if call function is taking args by double reference
+ let takes_arg_by_double_ref =
+ self.func_takes_arg_by_double_ref(parent_expr, cmt.hir_id);
+
+ // compiler will automatically dereference field or index projection, so no need
+ // to suggest ampersand, but full identifier that includes projection is required
+ let has_field_or_index_projection =
+ cmt.place.projections.iter().any(|proj| {
+ matches!(proj.kind, ProjectionKind::Field(..) | ProjectionKind::Index)
+ });
+
+ // no need to bind again if the function doesn't take arg by double ref
+ // and if the item is already a double ref
+ let ident_sugg = if !call_args.is_empty()
+ && !takes_arg_by_double_ref
+ && (self.closure_arg_is_type_annotated_double_ref || has_field_or_index_projection)
+ {
+ let ident = if has_field_or_index_projection {
+ ident_str_with_proj
+ } else {
+ ident_str
+ };
+ format!("{}{}", start_snip, ident)
+ } else {
+ format!("{}&{}", start_snip, ident_str)
+ };
+ self.suggestion_start.push_str(&ident_sugg);
+ self.next_pos = span.hi();
+ return;
+ }
+
+ self.applicability = Applicability::Unspecified;
+ },
+ _ => (),
+ }
+ }
+
+ let mut replacement_str = ident_str;
+ let mut projections_handled = false;
+ cmt.place.projections.iter().enumerate().for_each(|(i, proj)| {
+ match proj.kind {
+ // Field projection like `|v| v.foo`
+ // no adjustment needed here, as field projections are handled by the compiler
+ ProjectionKind::Field(..) => match cmt.place.ty_before_projection(i).kind() {
+ ty::Adt(..) | ty::Tuple(_) => {
+ replacement_str = ident_str_with_proj.clone();
+ projections_handled = true;
+ },
+ _ => (),
+ },
+ // Index projection like `|x| foo[x]`
+ // the index is dropped so we can't get it to build the suggestion,
+ // so the span is set-up again to get more code, using `span.hi()` (i.e.: `foo[x]`)
+ // instead of `span.lo()` (i.e.: `foo`)
+ ProjectionKind::Index => {
+ let start_span = Span::new(self.next_pos, span.hi(), span.ctxt(), None);
+ start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+ replacement_str.clear();
+ projections_handled = true;
+ },
+ // note: unable to trigger `Subslice` kind in tests
+ ProjectionKind::Subslice => (),
+ ProjectionKind::Deref => {
+ // Explicit derefs are typically handled later on, but
+ // some items do not need explicit deref, such as array accesses,
+ // so we mark them as already processed
+ // i.e.: don't suggest `*sub[1..4].len()` for `|sub| sub[1..4].len() == 3`
+ if let ty::Ref(_, inner, _) = cmt.place.ty_before_projection(i).kind() {
+ if matches!(inner.kind(), ty::Ref(_, innermost, _) if innermost.is_array()) {
+ projections_handled = true;
+ }
+ }
+ },
+ }
+ });
+
+ // handle `ProjectionKind::Deref` by removing one explicit deref
+ // if no special case was detected (i.e.: suggest `*x` instead of `**x`)
+ if !projections_handled {
+ let last_deref = cmt
+ .place
+ .projections
+ .iter()
+ .rposition(|proj| proj.kind == ProjectionKind::Deref);
+
+ if let Some(pos) = last_deref {
+ let mut projections = cmt.place.projections.clone();
+ projections.truncate(pos);
+
+ for item in projections {
+ if item.kind == ProjectionKind::Deref {
+ replacement_str = format!("*{}", replacement_str);
+ }
+ }
+ }
+ }
+
+ let _ = write!(self.suggestion_start, "{}{}", start_snip, replacement_str);
+ }
+ self.next_pos = span.hi();
+ }
+ }
+
+ fn mutate(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
+ fn fake_read(&mut self, _: &rustc_typeck::expr_use_visitor::PlaceWithHirId<'tcx>, _: FakeReadCause, _: HirId) {}
+}
+
+#[cfg(test)]
+mod test {
+ use super::Sugg;
+
+ use rustc_ast::util::parser::AssocOp;
+ use std::borrow::Cow;
+
+ const SUGGESTION: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("function_call()"));
+
+ #[test]
+ fn make_return_transform_sugg_into_a_return_call() {
+ assert_eq!("return function_call()", SUGGESTION.make_return().to_string());
+ }
+
+ #[test]
+ fn blockify_transforms_sugg_into_a_block() {
+ assert_eq!("{ function_call() }", SUGGESTION.blockify().to_string());
+ }
+
+ #[test]
+ fn binop_maybe_par() {
+ let sugg = Sugg::BinOp(AssocOp::Add, "1".into(), "1".into());
+ assert_eq!("(1 + 1)", sugg.maybe_par().to_string());
+
+ let sugg = Sugg::BinOp(AssocOp::Add, "(1 + 1)".into(), "(1 + 1)".into());
+ assert_eq!("((1 + 1) + (1 + 1))", sugg.maybe_par().to_string());
+ }
+ #[test]
+ fn not_op() {
+ use AssocOp::{Add, Equal, Greater, GreaterEqual, LAnd, LOr, Less, LessEqual, NotEqual};
+
+ fn test_not(op: AssocOp, correct: &str) {
+ let sugg = Sugg::BinOp(op, "x".into(), "y".into());
+ assert_eq!((!sugg).to_string(), correct);
+ }
+
+ // Invert the comparison operator.
+ test_not(Equal, "x != y");
+ test_not(NotEqual, "x == y");
+ test_not(Less, "x >= y");
+ test_not(LessEqual, "x > y");
+ test_not(Greater, "x <= y");
+ test_not(GreaterEqual, "x < y");
+
+ // Other operators are inverted like !(..).
+ test_not(Add, "!(x + y)");
+ test_not(LAnd, "!(x && y)");
+ test_not(LOr, "!(x || y)");
+ }
+}
--- /dev/null
- Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>),
+//! Util methods for [`rustc_middle::ty`]
+
+#![allow(clippy::module_name_repetitions)]
+
+use core::ops::ControlFlow;
+use rustc_ast::ast::Mutability;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir as hir;
+use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Expr, FnDecl, LangItem, TyKind, Unsafety};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::LateContext;
+use rustc_middle::mir::interpret::{ConstValue, Scalar};
+use rustc_middle::ty::subst::{GenericArg, GenericArgKind, Subst};
+use rustc_middle::ty::{
+ self, AdtDef, Binder, BoundRegion, DefIdTree, FnSig, IntTy, ParamEnv, Predicate, PredicateKind, ProjectionTy,
+ Region, RegionKind, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable, TypeVisitor, UintTy, VariantDef, VariantDiscr,
+};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Span, Symbol, DUMMY_SP};
+use rustc_target::abi::{Size, VariantIdx};
+use rustc_trait_selection::infer::InferCtxtExt;
+use rustc_trait_selection::traits::query::normalize::AtExt;
+use std::iter;
+
+use crate::{match_def_path, path_res, paths};
+
+// Checks if the given type implements copy.
+pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ ty.is_copy_modulo_regions(cx.tcx.at(DUMMY_SP), cx.param_env)
+}
+
+/// Checks whether a type can be partially moved.
+pub fn can_partially_move_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ if has_drop(cx, ty) || is_copy(cx, ty) {
+ return false;
+ }
+ match ty.kind() {
+ ty::Param(_) => false,
+ ty::Adt(def, subs) => def.all_fields().any(|f| !is_copy(cx, f.ty(cx.tcx, subs))),
+ _ => true,
+ }
+}
+
+/// Walks into `ty` and returns `true` if any inner type is the same as `other_ty`
+pub fn contains_ty<'tcx>(ty: Ty<'tcx>, other_ty: Ty<'tcx>) -> bool {
+ ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => other_ty == inner_ty,
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ })
+}
+
+/// Walks into `ty` and returns `true` if any inner type is an instance of the given adt
+/// constructor.
+pub fn contains_adt_constructor<'tcx>(ty: Ty<'tcx>, adt: AdtDef<'tcx>) -> bool {
+ ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => inner_ty.ty_adt_def() == Some(adt),
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ })
+}
+
+/// Resolves `<T as Iterator>::Item` for `T`
+/// Do not invoke without first verifying that the type implements `Iterator`
+pub fn get_iterator_item_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ cx.tcx
+ .get_diagnostic_item(sym::Iterator)
+ .and_then(|iter_did| get_associated_type(cx, ty, iter_did, "Item"))
+}
+
+/// Returns the associated type `name` for `ty` as an implementation of `trait_id`.
+/// Do not invoke without first verifying that the type implements the trait.
+pub fn get_associated_type<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ name: &str,
+) -> Option<Ty<'tcx>> {
+ cx.tcx
+ .associated_items(trait_id)
+ .find_by_name_and_kind(cx.tcx, Ident::from_str(name), ty::AssocKind::Type, trait_id)
+ .and_then(|assoc| {
+ let proj = cx.tcx.mk_projection(assoc.def_id, cx.tcx.mk_substs_trait(ty, &[]));
+ cx.tcx.try_normalize_erasing_regions(cx.param_env, proj).ok()
+ })
+}
+
+/// Get the diagnostic name of a type, e.g. `sym::HashMap`. To check if a type
+/// implements a trait marked with a diagnostic item use [`implements_trait`].
+///
+/// For a further exploitation what diagnostic items are see [diagnostic items] in
+/// rustc-dev-guide.
+///
+/// [Diagnostic Items]: https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-items.html
+pub fn get_type_diagnostic_name(cx: &LateContext<'_>, ty: Ty<'_>) -> Option<Symbol> {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.get_diagnostic_name(adt.did()),
+ _ => None,
+ }
+}
+
+/// Returns true if ty has `iter` or `iter_mut` methods
+pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<Symbol> {
+ // FIXME: instead of this hard-coded list, we should check if `<adt>::iter`
+ // exists and has the desired signature. Unfortunately FnCtxt is not exported
+ // so we can't use its `lookup_method` method.
+ let into_iter_collections: &[Symbol] = &[
+ sym::Vec,
+ sym::Option,
+ sym::Result,
+ sym::BTreeMap,
+ sym::BTreeSet,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::BinaryHeap,
+ sym::HashSet,
+ sym::HashMap,
+ sym::PathBuf,
+ sym::Path,
+ sym::Receiver,
+ ];
+
+ let ty_to_check = match probably_ref_ty.kind() {
+ ty::Ref(_, ty_to_check, _) => *ty_to_check,
+ _ => probably_ref_ty,
+ };
+
+ let def_id = match ty_to_check.kind() {
+ ty::Array(..) => return Some(sym::array),
+ ty::Slice(..) => return Some(sym::slice),
+ ty::Adt(adt, _) => adt.did(),
+ _ => return None,
+ };
+
+ for &name in into_iter_collections {
+ if cx.tcx.is_diagnostic_item(name, def_id) {
+ return Some(cx.tcx.item_name(def_id));
+ }
+ }
+ None
+}
+
+/// Checks whether a type implements a trait.
+/// The function returns false in case the type contains an inference variable.
+///
+/// See:
+/// * [`get_trait_def_id`](super::get_trait_def_id) to get a trait [`DefId`].
+/// * [Common tools for writing lints] for an example how to use this function and other options.
+///
+/// [Common tools for writing lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/common_tools_writing_lints.md#checking-if-a-type-implements-a-specific-trait
+pub fn implements_trait<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ ty_params: &[GenericArg<'tcx>],
+) -> bool {
+ implements_trait_with_env(cx.tcx, cx.param_env, ty, trait_id, ty_params)
+}
+
+/// Same as `implements_trait` but allows using a `ParamEnv` different from the lint context.
+pub fn implements_trait_with_env<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ param_env: ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ ty_params: &[GenericArg<'tcx>],
+) -> bool {
+ // Clippy shouldn't have infer types
+ assert!(!ty.needs_infer());
+
+ let ty = tcx.erase_regions(ty);
+ if ty.has_escaping_bound_vars() {
+ return false;
+ }
+ let ty_params = tcx.mk_substs(ty_params.iter());
+ tcx.infer_ctxt().enter(|infcx| {
+ infcx
+ .type_implements_trait(trait_id, ty, ty_params, param_env)
+ .must_apply_modulo_regions()
+ })
+}
+
+/// Checks whether this type implements `Drop`.
+pub fn has_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.ty_adt_def() {
+ Some(def) => def.has_dtor(cx.tcx),
+ None => false,
+ }
+}
+
+// Returns whether the type has #[must_use] attribute
+pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.has_attr(adt.did(), sym::must_use),
+ ty::Foreign(did) => cx.tcx.has_attr(*did, sym::must_use),
+ ty::Slice(ty) | ty::Array(ty, _) | ty::RawPtr(ty::TypeAndMut { ty, .. }) | ty::Ref(_, ty, _) => {
+ // for the Array case we don't need to care for the len == 0 case
+ // because we don't want to lint functions returning empty arrays
+ is_must_use_ty(cx, *ty)
+ },
+ ty::Tuple(substs) => substs.iter().any(|ty| is_must_use_ty(cx, ty)),
+ ty::Opaque(def_id, _) => {
+ for (predicate, _) in cx.tcx.explicit_item_bounds(*def_id) {
+ if let ty::PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder() {
+ if cx.tcx.has_attr(trait_predicate.trait_ref.def_id, sym::must_use) {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ ty::Dynamic(binder, _) => {
+ for predicate in binder.iter() {
+ if let ty::ExistentialPredicate::Trait(ref trait_ref) = predicate.skip_binder() {
+ if cx.tcx.has_attr(trait_ref.def_id, sym::must_use) {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ _ => false,
+ }
+}
+
+// FIXME: Per https://doc.rust-lang.org/nightly/nightly-rustc/rustc_trait_selection/infer/at/struct.At.html#method.normalize
+// this function can be removed once the `normalize` method does not panic when normalization does
+// not succeed
+/// Checks if `Ty` is normalizable. This function is useful
+/// to avoid crashes on `layout_of`.
+pub fn is_normalizable<'tcx>(cx: &LateContext<'tcx>, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
+ is_normalizable_helper(cx, param_env, ty, &mut FxHashMap::default())
+}
+
+fn is_normalizable_helper<'tcx>(
+ cx: &LateContext<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ cache: &mut FxHashMap<Ty<'tcx>, bool>,
+) -> bool {
+ if let Some(&cached_result) = cache.get(&ty) {
+ return cached_result;
+ }
+ // prevent recursive loops, false-negative is better than endless loop leading to stack overflow
+ cache.insert(ty, false);
+ let result = cx.tcx.infer_ctxt().enter(|infcx| {
+ let cause = rustc_middle::traits::ObligationCause::dummy();
+ if infcx.at(&cause, param_env).normalize(ty).is_ok() {
+ match ty.kind() {
+ ty::Adt(def, substs) => def.variants().iter().all(|variant| {
+ variant
+ .fields
+ .iter()
+ .all(|field| is_normalizable_helper(cx, param_env, field.ty(cx.tcx, substs), cache))
+ }),
+ _ => ty.walk().all(|generic_arg| match generic_arg.unpack() {
+ GenericArgKind::Type(inner_ty) if inner_ty != ty => {
+ is_normalizable_helper(cx, param_env, inner_ty, cache)
+ },
+ _ => true, // if inner_ty == ty, we've already checked it
+ }),
+ }
+ } else {
+ false
+ }
+ });
+ cache.insert(ty, result);
+ result
+}
+
+/// Returns `true` if the given type is a non aggregate primitive (a `bool` or `char`, any
+/// integer or floating-point number type). For checking aggregation of primitive types (e.g.
+/// tuples and slices of primitive type) see `is_recursively_primitive_type`
+pub fn is_non_aggregate_primitive_type(ty: Ty<'_>) -> bool {
+ matches!(ty.kind(), ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_))
+}
+
+/// Returns `true` if the given type is a primitive (a `bool` or `char`, any integer or
+/// floating-point number type, a `str`, or an array, slice, or tuple of those types).
+pub fn is_recursively_primitive_type(ty: Ty<'_>) -> bool {
+ match *ty.kind() {
+ ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str => true,
+ ty::Ref(_, inner, _) if *inner.kind() == ty::Str => true,
+ ty::Array(inner_type, _) | ty::Slice(inner_type) => is_recursively_primitive_type(inner_type),
+ ty::Tuple(inner_types) => inner_types.iter().all(is_recursively_primitive_type),
+ _ => false,
+ }
+}
+
+/// Checks if the type is a reference equals to a diagnostic item
+pub fn is_type_ref_to_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Ref(_, ref_ty, _) => match ref_ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did()),
+ _ => false,
+ },
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a diagnostic item. To check if a type implements a
+/// trait marked with a diagnostic item use [`implements_trait`].
+///
+/// For a further exploitation what diagnostic items are see [diagnostic items] in
+/// rustc-dev-guide.
+///
+/// ---
+///
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+///
+/// [Diagnostic Items]: https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-items.html
+pub fn is_type_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did()),
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a lang item.
+///
+/// Returns `false` if the `LangItem` is not defined.
+pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: hir::LangItem) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx
+ .tcx
+ .lang_items()
+ .require(lang_item)
+ .map_or(false, |li| li == adt.did()),
+ _ => false,
+ }
+}
+
+/// Return `true` if the passed `typ` is `isize` or `usize`.
+pub fn is_isize_or_usize(typ: Ty<'_>) -> bool {
+ matches!(typ.kind(), ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize))
+}
+
+/// Checks if type is struct, enum or union type with the given def path.
+///
+/// If the type is a diagnostic item, use `is_type_diagnostic_item` instead.
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+pub fn match_type(cx: &LateContext<'_>, ty: Ty<'_>, path: &[&str]) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => match_def_path(cx, adt.did(), path),
+ _ => false,
+ }
+}
+
+/// Checks if the drop order for a type matters. Some std types implement drop solely to
+/// deallocate memory. For these types, and composites containing them, changing the drop order
+/// won't result in any observable side effects.
+pub fn needs_ordered_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ fn needs_ordered_drop_inner<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>, seen: &mut FxHashSet<Ty<'tcx>>) -> bool {
+ if !seen.insert(ty) {
+ return false;
+ }
+ if !ty.has_significant_drop(cx.tcx, cx.param_env) {
+ false
+ }
+ // Check for std types which implement drop, but only for memory allocation.
+ else if is_type_lang_item(cx, ty, LangItem::OwnedBox)
+ || matches!(
+ get_type_diagnostic_name(cx, ty),
+ Some(sym::HashSet | sym::Rc | sym::Arc | sym::cstring_type)
+ )
+ || match_type(cx, ty, &paths::WEAK_RC)
+ || match_type(cx, ty, &paths::WEAK_ARC)
+ {
+ // Check all of the generic arguments.
+ if let ty::Adt(_, subs) = ty.kind() {
+ subs.types().any(|ty| needs_ordered_drop_inner(cx, ty, seen))
+ } else {
+ true
+ }
+ } else if !cx
+ .tcx
+ .lang_items()
+ .drop_trait()
+ .map_or(false, |id| implements_trait(cx, ty, id, &[]))
+ {
+ // This type doesn't implement drop, so no side effects here.
+ // Check if any component type has any.
+ match ty.kind() {
+ ty::Tuple(fields) => fields.iter().any(|ty| needs_ordered_drop_inner(cx, ty, seen)),
+ ty::Array(ty, _) => needs_ordered_drop_inner(cx, *ty, seen),
+ ty::Adt(adt, subs) => adt
+ .all_fields()
+ .map(|f| f.ty(cx.tcx, subs))
+ .any(|ty| needs_ordered_drop_inner(cx, ty, seen)),
+ _ => true,
+ }
+ } else {
+ true
+ }
+ }
+
+ needs_ordered_drop_inner(cx, ty, &mut FxHashSet::default())
+}
+
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_mid_ty_refs(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn peel(ty: Ty<'_>, count: usize) -> (Ty<'_>, usize) {
+ if let ty::Ref(_, ty, _) = ty.kind() {
+ peel(*ty, count + 1)
+ } else {
+ (ty, count)
+ }
+ }
+ peel(ty, 0)
+}
+
+/// Peels off all references on the type.Returns the underlying type, the number of references
+/// removed, and whether the pointer is ultimately mutable or not.
+pub fn peel_mid_ty_refs_is_mutable(ty: Ty<'_>) -> (Ty<'_>, usize, Mutability) {
+ fn f(ty: Ty<'_>, count: usize, mutability: Mutability) -> (Ty<'_>, usize, Mutability) {
+ match ty.kind() {
+ ty::Ref(_, ty, Mutability::Mut) => f(*ty, count + 1, mutability),
+ ty::Ref(_, ty, Mutability::Not) => f(*ty, count + 1, Mutability::Not),
+ _ => (ty, count, mutability),
+ }
+ }
+ f(ty, 0, Mutability::Mut)
+}
+
+/// Returns `true` if the given type is an `unsafe` function.
+pub fn type_is_unsafe_function<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::FnDef(..) | ty::FnPtr(_) => ty.fn_sig(cx.tcx).unsafety() == Unsafety::Unsafe,
+ _ => false,
+ }
+}
+
+/// Returns the base type for HIR references and pointers.
+pub fn walk_ptrs_hir_ty<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
+ match ty.kind {
+ TyKind::Ptr(ref mut_ty) | TyKind::Rptr(_, ref mut_ty) => walk_ptrs_hir_ty(mut_ty.ty),
+ _ => ty,
+ }
+}
+
+/// Returns the base type for references and raw pointers, and count reference
+/// depth.
+pub fn walk_ptrs_ty_depth(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn inner(ty: Ty<'_>, depth: usize) -> (Ty<'_>, usize) {
+ match ty.kind() {
+ ty::Ref(_, ty, _) => inner(*ty, depth + 1),
+ _ => (ty, depth),
+ }
+ }
+ inner(ty, 0)
+}
+
+/// Returns `true` if types `a` and `b` are same types having same `Const` generic args,
+/// otherwise returns `false`
+pub fn same_type_and_consts<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
+ match (&a.kind(), &b.kind()) {
+ (&ty::Adt(did_a, substs_a), &ty::Adt(did_b, substs_b)) => {
+ if did_a != did_b {
+ return false;
+ }
+
+ substs_a
+ .iter()
+ .zip(substs_b.iter())
+ .all(|(arg_a, arg_b)| match (arg_a.unpack(), arg_b.unpack()) {
+ (GenericArgKind::Const(inner_a), GenericArgKind::Const(inner_b)) => inner_a == inner_b,
+ (GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => {
+ same_type_and_consts(type_a, type_b)
+ },
+ _ => true,
+ })
+ },
+ _ => a == b,
+ }
+}
+
+/// Checks if a given type looks safe to be uninitialized.
+pub fn is_uninit_value_valid_for_ty(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ match *ty.kind() {
+ ty::Array(component, _) => is_uninit_value_valid_for_ty(cx, component),
+ ty::Tuple(types) => types.iter().all(|ty| is_uninit_value_valid_for_ty(cx, ty)),
+ ty::Adt(adt, _) => cx.tcx.lang_items().maybe_uninit() == Some(adt.did()),
+ _ => false,
+ }
+}
+
+/// Gets an iterator over all predicates which apply to the given item.
+pub fn all_predicates_of(tcx: TyCtxt<'_>, id: DefId) -> impl Iterator<Item = &(Predicate<'_>, Span)> {
+ let mut next_id = Some(id);
+ iter::from_fn(move || {
+ next_id.take().map(|id| {
+ let preds = tcx.predicates_of(id);
+ next_id = preds.parent;
+ preds.predicates.iter()
+ })
+ })
+ .flatten()
+}
+
+/// A signature for a function like type.
+#[derive(Clone, Copy)]
+pub enum ExprFnSig<'tcx> {
+ Sig(Binder<'tcx, FnSig<'tcx>>, Option<DefId>),
+ Closure(Option<&'tcx FnDecl<'tcx>>, Binder<'tcx, FnSig<'tcx>>),
- Self::Trait(inputs, _) => Some(inputs.map_bound(|ty| ty.tuple_fields()[i])),
++ Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>, Option<DefId>),
+}
+impl<'tcx> ExprFnSig<'tcx> {
+ /// Gets the argument type at the given offset. This will return `None` when the index is out of
+ /// bounds only for variadic functions, otherwise this will panic.
+ pub fn input(self, i: usize) -> Option<Binder<'tcx, Ty<'tcx>>> {
+ match self {
+ Self::Sig(sig, _) => {
+ if sig.c_variadic() {
+ sig.inputs().map_bound(|inputs| inputs.get(i).copied()).transpose()
+ } else {
+ Some(sig.input(i))
+ }
+ },
+ Self::Closure(_, sig) => Some(sig.input(0).map_bound(|ty| ty.tuple_fields()[i])),
- Self::Trait(inputs, _) => Some((None, inputs.map_bound(|ty| ty.tuple_fields()[i]))),
++ Self::Trait(inputs, _, _) => Some(inputs.map_bound(|ty| ty.tuple_fields()[i])),
+ }
+ }
+
+ /// Gets the argument type at the given offset. For closures this will also get the type as
+ /// written. This will return `None` when the index is out of bounds only for variadic
+ /// functions, otherwise this will panic.
+ pub fn input_with_hir(self, i: usize) -> Option<(Option<&'tcx hir::Ty<'tcx>>, Binder<'tcx, Ty<'tcx>>)> {
+ match self {
+ Self::Sig(sig, _) => {
+ if sig.c_variadic() {
+ sig.inputs()
+ .map_bound(|inputs| inputs.get(i).copied())
+ .transpose()
+ .map(|arg| (None, arg))
+ } else {
+ Some((None, sig.input(i)))
+ }
+ },
+ Self::Closure(decl, sig) => Some((
+ decl.and_then(|decl| decl.inputs.get(i)),
+ sig.input(0).map_bound(|ty| ty.tuple_fields()[i]),
+ )),
- Self::Trait(_, output) => output,
++ Self::Trait(inputs, _, _) => Some((None, inputs.map_bound(|ty| ty.tuple_fields()[i]))),
+ }
+ }
+
+ /// Gets the result type, if one could be found. Note that the result type of a trait may not be
+ /// specified.
+ pub fn output(self) -> Option<Binder<'tcx, Ty<'tcx>>> {
+ match self {
+ Self::Sig(sig, _) | Self::Closure(_, sig) => Some(sig.output()),
- if let ExprFnSig::Sig(_, id) = *self { id } else { None }
++ Self::Trait(_, output, _) => output,
+ }
+ }
+
+ pub fn predicates_id(&self) -> Option<DefId> {
- fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'tcx>> {
++ if let ExprFnSig::Sig(_, id) | ExprFnSig::Trait(_, _, id) = *self {
++ id
++ } else {
++ None
++ }
+ }
+}
+
+/// If the expression is function like, get the signature for it.
+pub fn expr_sig<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> Option<ExprFnSig<'tcx>> {
+ if let Res::Def(DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::AssocFn, id) = path_res(cx, expr) {
+ Some(ExprFnSig::Sig(cx.tcx.fn_sig(id), Some(id)))
+ } else {
+ ty_sig(cx, cx.typeck_results().expr_ty_adjusted(expr).peel_refs())
+ }
+}
+
- ty::Opaque(id, _) => ty_sig(cx, cx.tcx.type_of(id)),
++/// If the type is function like, get the signature for it.
++pub fn ty_sig<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'tcx>> {
+ if ty.is_box() {
+ return ty_sig(cx, ty.boxed_ty());
+ }
+ match *ty.kind() {
+ ty::Closure(id, subs) => {
+ let decl = id
+ .as_local()
+ .and_then(|id| cx.tcx.hir().fn_decl_by_hir_id(cx.tcx.hir().local_def_id_to_hir_id(id)));
+ Some(ExprFnSig::Closure(decl, subs.as_closure().sig()))
+ },
+ ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.bound_fn_sig(id).subst(cx.tcx, subs), Some(id))),
- Some(ExprFnSig::Trait(bound.map_bound(|b| b.substs.type_at(0)), output))
++ ty::Opaque(id, _) => sig_from_bounds(cx, ty, cx.tcx.item_bounds(id), cx.tcx.opt_parent(id)),
+ ty::FnPtr(sig) => Some(ExprFnSig::Sig(sig, None)),
+ ty::Dynamic(bounds, _) => {
+ let lang_items = cx.tcx.lang_items();
+ match bounds.principal() {
+ Some(bound)
+ if Some(bound.def_id()) == lang_items.fn_trait()
+ || Some(bound.def_id()) == lang_items.fn_once_trait()
+ || Some(bound.def_id()) == lang_items.fn_mut_trait() =>
+ {
+ let output = bounds
+ .projection_bounds()
+ .find(|p| lang_items.fn_once_output().map_or(false, |id| id == p.item_def_id()))
+ .map(|p| p.map_bound(|p| p.term.ty().unwrap()));
- _ => sig_for_projection(cx, proj).or_else(|| sig_from_bounds(cx, ty)),
++ Some(ExprFnSig::Trait(bound.map_bound(|b| b.substs.type_at(0)), output, None))
+ },
+ _ => None,
+ }
+ },
+ ty::Projection(proj) => match cx.tcx.try_normalize_erasing_regions(cx.param_env, ty) {
+ Ok(normalized_ty) if normalized_ty != ty => ty_sig(cx, normalized_ty),
- ty::Param(_) => sig_from_bounds(cx, ty),
++ _ => sig_for_projection(cx, proj).or_else(|| sig_from_bounds(cx, ty, cx.param_env.caller_bounds(), None)),
+ },
- fn sig_from_bounds<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<ExprFnSig<'tcx>> {
++ ty::Param(_) => sig_from_bounds(cx, ty, cx.param_env.caller_bounds(), None),
+ _ => None,
+ }
+}
+
- for (pred, _) in all_predicates_of(cx.tcx, cx.typeck_results().hir_owner.to_def_id()) {
++fn sig_from_bounds<'tcx>(
++ cx: &LateContext<'tcx>,
++ ty: Ty<'tcx>,
++ predicates: &'tcx [Predicate<'tcx>],
++ predicates_id: Option<DefId>,
++) -> Option<ExprFnSig<'tcx>> {
+ let mut inputs = None;
+ let mut output = None;
+ let lang_items = cx.tcx.lang_items();
+
- if inputs.is_some() {
++ for pred in predicates {
+ match pred.kind().skip_binder() {
+ PredicateKind::Trait(p)
+ if (lang_items.fn_trait() == Some(p.def_id())
+ || lang_items.fn_mut_trait() == Some(p.def_id())
+ || lang_items.fn_once_trait() == Some(p.def_id()))
+ && p.self_ty() == ty =>
+ {
- inputs = Some(pred.kind().rebind(p.trait_ref.substs.type_at(1)));
++ let i = pred.kind().rebind(p.trait_ref.substs.type_at(1));
++ if inputs.map_or(false, |inputs| i != inputs) {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
- inputs.map(|ty| ExprFnSig::Trait(ty, output))
++ inputs = Some(i);
+ },
+ PredicateKind::Projection(p)
+ if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output()
+ && p.projection_ty.self_ty() == ty =>
+ {
+ if output.is_some() {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ output = Some(pred.kind().rebind(p.term.ty().unwrap()));
+ },
+ _ => (),
+ }
+ }
+
- if inputs.is_some() {
++ inputs.map(|ty| ExprFnSig::Trait(ty, output, predicates_id))
+}
+
+fn sig_for_projection<'tcx>(cx: &LateContext<'tcx>, ty: ProjectionTy<'tcx>) -> Option<ExprFnSig<'tcx>> {
+ let mut inputs = None;
+ let mut output = None;
+ let lang_items = cx.tcx.lang_items();
+
+ for pred in cx
+ .tcx
+ .bound_explicit_item_bounds(ty.item_def_id)
+ .transpose_iter()
+ .map(|x| x.map_bound(|(p, _)| p))
+ {
+ match pred.0.kind().skip_binder() {
+ PredicateKind::Trait(p)
+ if (lang_items.fn_trait() == Some(p.def_id())
+ || lang_items.fn_mut_trait() == Some(p.def_id())
+ || lang_items.fn_once_trait() == Some(p.def_id())) =>
+ {
- inputs = Some(
- pred.map_bound(|pred| pred.kind().rebind(p.trait_ref.substs.type_at(1)))
- .subst(cx.tcx, ty.substs),
- );
++ let i = pred
++ .map_bound(|pred| pred.kind().rebind(p.trait_ref.substs.type_at(1)))
++ .subst(cx.tcx, ty.substs);
++
++ if inputs.map_or(false, |inputs| inputs != i) {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
- inputs.map(|ty| ExprFnSig::Trait(ty, output))
++ inputs = Some(i);
+ },
+ PredicateKind::Projection(p) if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output() => {
+ if output.is_some() {
+ // Multiple different fn trait impls. Is this even allowed?
+ return None;
+ }
+ output = Some(
+ pred.map_bound(|pred| pred.kind().rebind(p.term.ty().unwrap()))
+ .subst(cx.tcx, ty.substs),
+ );
+ },
+ _ => (),
+ }
+ }
+
++ inputs.map(|ty| ExprFnSig::Trait(ty, output, None))
+}
+
+#[derive(Clone, Copy)]
+pub enum EnumValue {
+ Unsigned(u128),
+ Signed(i128),
+}
+impl core::ops::Add<u32> for EnumValue {
+ type Output = Self;
+ fn add(self, n: u32) -> Self::Output {
+ match self {
+ Self::Unsigned(x) => Self::Unsigned(x + u128::from(n)),
+ Self::Signed(x) => Self::Signed(x + i128::from(n)),
+ }
+ }
+}
+
+/// Attempts to read the given constant as though it were an an enum value.
+#[expect(clippy::cast_possible_truncation, clippy::cast_possible_wrap)]
+pub fn read_explicit_enum_value(tcx: TyCtxt<'_>, id: DefId) -> Option<EnumValue> {
+ if let Ok(ConstValue::Scalar(Scalar::Int(value))) = tcx.const_eval_poly(id) {
+ match tcx.type_of(id).kind() {
+ ty::Int(_) => Some(EnumValue::Signed(match value.size().bytes() {
+ 1 => i128::from(value.assert_bits(Size::from_bytes(1)) as u8 as i8),
+ 2 => i128::from(value.assert_bits(Size::from_bytes(2)) as u16 as i16),
+ 4 => i128::from(value.assert_bits(Size::from_bytes(4)) as u32 as i32),
+ 8 => i128::from(value.assert_bits(Size::from_bytes(8)) as u64 as i64),
+ 16 => value.assert_bits(Size::from_bytes(16)) as i128,
+ _ => return None,
+ })),
+ ty::Uint(_) => Some(EnumValue::Unsigned(match value.size().bytes() {
+ 1 => value.assert_bits(Size::from_bytes(1)),
+ 2 => value.assert_bits(Size::from_bytes(2)),
+ 4 => value.assert_bits(Size::from_bytes(4)),
+ 8 => value.assert_bits(Size::from_bytes(8)),
+ 16 => value.assert_bits(Size::from_bytes(16)),
+ _ => return None,
+ })),
+ _ => None,
+ }
+ } else {
+ None
+ }
+}
+
+/// Gets the value of the given variant.
+pub fn get_discriminant_value(tcx: TyCtxt<'_>, adt: AdtDef<'_>, i: VariantIdx) -> EnumValue {
+ let variant = &adt.variant(i);
+ match variant.discr {
+ VariantDiscr::Explicit(id) => read_explicit_enum_value(tcx, id).unwrap(),
+ VariantDiscr::Relative(x) => match adt.variant((i.as_usize() - x as usize).into()).discr {
+ VariantDiscr::Explicit(id) => read_explicit_enum_value(tcx, id).unwrap() + x,
+ VariantDiscr::Relative(_) => EnumValue::Unsigned(x.into()),
+ },
+ }
+}
+
+/// Check if the given type is either `core::ffi::c_void`, `std::os::raw::c_void`, or one of the
+/// platform specific `libc::<platform>::c_void` types in libc.
+pub fn is_c_void(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ if let ty::Adt(adt, _) = ty.kind()
+ && let &[krate, .., name] = &*cx.get_def_path(adt.did())
+ && let sym::libc | sym::core | sym::std = krate
+ && name.as_str() == "c_void"
+ {
+ true
+ } else {
+ false
+ }
+}
+
+pub fn for_each_top_level_late_bound_region<B>(
+ ty: Ty<'_>,
+ f: impl FnMut(BoundRegion) -> ControlFlow<B>,
+) -> ControlFlow<B> {
+ struct V<F> {
+ index: u32,
+ f: F,
+ }
+ impl<'tcx, B, F: FnMut(BoundRegion) -> ControlFlow<B>> TypeVisitor<'tcx> for V<F> {
+ type BreakTy = B;
+ fn visit_region(&mut self, r: Region<'tcx>) -> ControlFlow<Self::BreakTy> {
+ if let RegionKind::ReLateBound(idx, bound) = r.kind() && idx.as_u32() == self.index {
+ (self.f)(bound)
+ } else {
+ ControlFlow::Continue(())
+ }
+ }
+ fn visit_binder<T: TypeVisitable<'tcx>>(&mut self, t: &Binder<'tcx, T>) -> ControlFlow<Self::BreakTy> {
+ self.index += 1;
+ let res = t.super_visit_with(self);
+ self.index -= 1;
+ res
+ }
+ }
+ ty.visit_with(&mut V { index: 0, f })
+}
+
+/// Gets the struct or enum variant from the given `Res`
+pub fn variant_of_res<'tcx>(cx: &LateContext<'tcx>, res: Res) -> Option<&'tcx VariantDef> {
+ match res {
+ Res::Def(DefKind::Struct, id) => Some(cx.tcx.adt_def(id).non_enum_variant()),
+ Res::Def(DefKind::Variant, id) => Some(cx.tcx.adt_def(cx.tcx.parent(id)).variant_with_id(id)),
+ Res::Def(DefKind::Ctor(CtorOf::Struct, _), id) => Some(cx.tcx.adt_def(cx.tcx.parent(id)).non_enum_variant()),
+ Res::Def(DefKind::Ctor(CtorOf::Variant, _), id) => {
+ let var_id = cx.tcx.parent(id);
+ Some(cx.tcx.adt_def(cx.tcx.parent(var_id)).variant_with_id(var_id))
+ },
+ Res::SelfCtor(id) => Some(cx.tcx.type_of(id).ty_adt_def().unwrap().non_enum_variant()),
+ _ => None,
+ }
+}
+
+/// Checks if the type is a type parameter implementing `FnOnce`, but not `FnMut`.
+pub fn ty_is_fn_once_param<'tcx>(tcx: TyCtxt<'_>, ty: Ty<'tcx>, predicates: &'tcx [Predicate<'_>]) -> bool {
+ let ty::Param(ty) = *ty.kind() else {
+ return false;
+ };
+ let lang = tcx.lang_items();
+ let (Some(fn_once_id), Some(fn_mut_id), Some(fn_id))
+ = (lang.fn_once_trait(), lang.fn_mut_trait(), lang.fn_trait())
+ else {
+ return false;
+ };
+ predicates
+ .iter()
+ .try_fold(false, |found, p| {
+ if let PredicateKind::Trait(p) = p.kind().skip_binder()
+ && let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
+ && ty.index == self_ty.index
+ {
+ // This should use `super_traits_of`, but that's a private function.
+ if p.trait_ref.def_id == fn_once_id {
+ return Some(true);
+ } else if p.trait_ref.def_id == fn_mut_id || p.trait_ref.def_id == fn_id {
+ return None;
+ }
+ }
+ Some(found)
+ })
+ .unwrap_or(false)
+}
--- /dev/null
- channel = "nightly-2022-07-28"
+[toolchain]
++channel = "nightly-2022-08-11"
+components = ["cargo", "llvm-tools-preview", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
- = help: please use a valid sematic version, see `doc/adding_lints.md`
+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
+ --> $DIR/check_clippy_version_attribute.rs:1:9
+ |
+LL | #![deny(clippy::internal)]
+ | ^^^^^^^^^^^^^^^^
+ = note: `#[deny(clippy::invalid_clippy_version_attribute)]` implied by `#[deny(clippy::internal)]`
- = help: please use a valid sematic version, see `doc/adding_lints.md`
++ = help: please use a valid semantic version, see `doc/adding_lints.md`
+ = note: this error originates in the macro `$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: this item has an invalid `clippy::version` attribute
+ --> $DIR/check_clippy_version_attribute.rs:48:1
+ |
+LL | / declare_tool_lint! {
+LL | | #[clippy::version = "I'm a string"]
+LL | | pub clippy::INVALID_TWO,
+LL | | Warn,
+LL | | "Two",
+LL | | report_in_external_macro: true
+LL | | }
+ | |_^
+ |
++ = help: please use a valid semantic version, see `doc/adding_lints.md`
+ = note: this error originates in the macro `$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: 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` 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
- blacklisted-names = 42
++disallowed-names = 42
--- /dev/null
- error: error reading Clippy's configuration file `$DIR/clippy.toml`: invalid type: integer `42`, expected a sequence for key `blacklisted-names`
++error: error reading Clippy's configuration file `$DIR/clippy.toml`: invalid type: integer `42`, expected a sequence for key `disallowed-names`
+
+error: aborting due to previous error
+
--- /dev/null
- # that one is an error
- cyclomatic-complexity-threshold = 42
++# Expect errors from these deprecated configs
++cyclomatic-complexity-threshold = 2
++blacklisted-names = [ "..", "wibble" ]
+
+# that one is white-listed
+[third-party]
+clippy-feature = "nightly"
--- /dev/null
+fn main() {}
++
++#[warn(clippy::cognitive_complexity)]
++fn cognitive_complexity() {
++ let x = vec![1, 2, 3];
++ for i in x {
++ if i == 1 {
++ println!("{}", i);
++ }
++ }
++}
--- /dev/null
- error: error reading Clippy's configuration file `$DIR/clippy.toml`: deprecated field `cyclomatic-complexity-threshold`. Please use `cognitive-complexity-threshold` instead
++warning: error reading Clippy's configuration file `$DIR/clippy.toml`: deprecated field `cyclomatic-complexity-threshold`. Please use `cognitive-complexity-threshold` instead
+
- error: aborting due to previous error
++warning: error reading Clippy's configuration file `$DIR/clippy.toml`: deprecated field `blacklisted-names`. Please use `disallowed-names` instead
++
++error: the function has a cognitive complexity of (3/2)
++ --> $DIR/conf_deprecated_key.rs:4:4
++ |
++LL | fn cognitive_complexity() {
++ | ^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::cognitive-complexity` implied by `-D warnings`
++ = help: you could split it up into multiple smaller functions
++
++error: aborting due to previous error; 2 warnings emitted
+
--- /dev/null
--- /dev/null
++disallowed-names = ["ducks", ".."]
--- /dev/null
--- /dev/null
++#[warn(clippy::disallowed_names)]
++
++fn main() {
++ // `foo` is part of the default configuration
++ let foo = "bar";
++ // `ducks` was unrightfully disallowed
++ let ducks = ["quack", "quack"];
++ // `fox` is okay
++ let fox = ["what", "does", "the", "fox", "say", "?"];
++}
--- /dev/null
--- /dev/null
++error: use of a disallowed/placeholder name `foo`
++ --> $DIR/disallowed_names.rs:5:9
++ |
++LL | let foo = "bar";
++ | ^^^
++ |
++ = note: `-D clippy::disallowed-names` implied by `-D warnings`
++
++error: use of a disallowed/placeholder name `ducks`
++ --> $DIR/disallowed_names.rs:7:9
++ |
++LL | let ducks = ["quack", "quack"];
++ | ^^^^^
++
++error: aborting due to 2 previous errors
++
--- /dev/null
--- /dev/null
++disallowed-names = ["ducks"]
--- /dev/null
--- /dev/null
++#[warn(clippy::disallowed_names)]
++
++fn main() {
++ // `foo` is part of the default configuration
++ let foo = "bar";
++ // `ducks` was unrightfully disallowed
++ let ducks = ["quack", "quack"];
++ // `fox` is okay
++ let fox = ["what", "does", "the", "fox", "say", "?"];
++}
--- /dev/null
--- /dev/null
++error: use of a disallowed/placeholder name `ducks`
++ --> $DIR/disallowed_names.rs:7:9
++ |
++LL | let ducks = ["quack", "quack"];
++ | ^^^^^
++ |
++ = note: `-D clippy::disallowed-names` implied by `-D warnings`
++
++error: aborting due to previous error
++
--- /dev/null
--- /dev/null
++cognitive-complexity-threshold = 2
++# This is the deprecated name for the same key
++cyclomatic-complexity-threshold = 3
++# Check we get duplication warning regardless of order
++cognitive-complexity-threshold = 4
--- /dev/null
--- /dev/null
++fn main() {}
--- /dev/null
--- /dev/null
++error: error reading Clippy's configuration file `$DIR/clippy.toml`: duplicate field `cognitive_complexity_threshold` (provided as `cyclomatic_complexity_threshold`)
++
++error: error reading Clippy's configuration file `$DIR/clippy.toml`: duplicate field `cognitive-complexity-threshold`
++
++warning: error reading Clippy's configuration file `$DIR/clippy.toml`: deprecated field `cyclomatic-complexity-threshold`. Please use `cognitive-complexity-threshold` instead
++
++error: aborting due to 2 previous errors; 1 warning emitted
++
--- /dev/null
- = help: if this value is an `None`, it will panic
+error: used `expect()` on `an Option` value
+ --> $DIR/expect_used.rs:6:13
+ |
+LL | let _ = opt.expect("");
+ | ^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::expect-used` implied by `-D warnings`
++ = help: if this value is `None`, it will panic
+
+error: used `expect()` on `a Result` value
+ --> $DIR/expect_used.rs:11:13
+ |
+LL | let _ = res.expect("");
+ | ^^^^^^^^^^^^^^
+ |
+ = help: if this value is an `Err`, it will panic
+
+error: aborting due to 2 previous errors
+
--- /dev/null
--- /dev/null
++disallowed-names = ["toto", "tata", "titi"]
--- /dev/null
--- /dev/null
++#![allow(dead_code)]
++#![allow(clippy::single_match)]
++#![allow(unused_variables)]
++#![warn(clippy::disallowed_names)]
++
++fn test(toto: ()) {}
++
++fn main() {
++ let toto = 42;
++ let tata = 42;
++ let titi = 42;
++
++ let tatab = 42;
++ let tatatataic = 42;
++
++ match (42, Some(1337), Some(0)) {
++ (toto, Some(tata), titi @ Some(_)) => (),
++ _ => (),
++ }
++}
--- /dev/null
--- /dev/null
++error: use of a disallowed/placeholder name `toto`
++ --> $DIR/conf_french_disallowed_name.rs:6:9
++ |
++LL | fn test(toto: ()) {}
++ | ^^^^
++ |
++ = note: `-D clippy::disallowed-names` implied by `-D warnings`
++
++error: use of a disallowed/placeholder name `toto`
++ --> $DIR/conf_french_disallowed_name.rs:9:9
++ |
++LL | let toto = 42;
++ | ^^^^
++
++error: use of a disallowed/placeholder name `tata`
++ --> $DIR/conf_french_disallowed_name.rs:10:9
++ |
++LL | let tata = 42;
++ | ^^^^
++
++error: use of a disallowed/placeholder name `titi`
++ --> $DIR/conf_french_disallowed_name.rs:11:9
++ |
++LL | let titi = 42;
++ | ^^^^
++
++error: use of a disallowed/placeholder name `toto`
++ --> $DIR/conf_french_disallowed_name.rs:17:10
++ |
++LL | (toto, Some(tata), titi @ Some(_)) => (),
++ | ^^^^
++
++error: use of a disallowed/placeholder name `tata`
++ --> $DIR/conf_french_disallowed_name.rs:17:21
++ |
++LL | (toto, Some(tata), titi @ Some(_)) => (),
++ | ^^^^
++
++error: use of a disallowed/placeholder name `titi`
++ --> $DIR/conf_french_disallowed_name.rs:17:28
++ |
++LL | (toto, Some(tata), titi @ Some(_)) => (),
++ | ^^^^
++
++error: aborting due to 7 previous errors
++
--- /dev/null
+error: error reading Clippy's configuration file `$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-names
+ 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
+// 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 ok with some messages
++ let r: Result<Foo, DebugFoo> = Ok(Foo);
++ assert!(r.is_ok(), "oops");
++
++ // test ok with unit error
++ let r: Result<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
+// 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 ok with some messages
++ let r: Result<Foo, DebugFoo> = Ok(Foo);
++ assert!(r.is_ok(), "oops");
++
++ // test ok with unit error
++ let r: Result<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
- --> $DIR/assertions_on_result_states.rs:34:5
+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:37:5
++ --> $DIR/assertions_on_result_states.rs:42:5
+ |
+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:50:5
++ --> $DIR/assertions_on_result_states.rs:45:5
+ |
+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:56:9
++ --> $DIR/assertions_on_result_states.rs:58:5
+ |
+LL | assert!(r.is_ok());
+ | ^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap()`
+
+error: called `assert!` with `Result::is_ok`
- --> $DIR/assertions_on_result_states.rs:64:5
++ --> $DIR/assertions_on_result_states.rs:64:9
+ |
+LL | assert!(r.is_ok());
+ | ^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap()`
+
+error: called `assert!` with `Result::is_err`
++ --> $DIR/assertions_on_result_states.rs:72:5
+ |
+LL | assert!(r.is_err());
+ | ^^^^^^^^^^^^^^^^^^^ help: replace with: `r.unwrap_err()`
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+#![deny(clippy::borrowed_box)]
++#![allow(clippy::disallowed_names)]
+#![allow(unused_variables)]
+#![allow(dead_code)]
+
+use std::fmt::Display;
+
+pub fn test1(foo: &mut Box<bool>) {
+ // Although this function could be changed to "&mut bool",
+ // avoiding the Box, mutable references to boxes are not
+ // flagged by this lint.
+ //
+ // This omission is intentional: By passing a mutable Box,
+ // the memory location of the pointed-to object could be
+ // modified. By passing a mutable reference, the contents
+ // could change, but not the location.
+ println!("{:?}", foo)
+}
+
+pub fn test2() {
+ let foo: &Box<bool>;
+}
+
+struct Test3<'a> {
+ foo: &'a Box<bool>,
+}
+
+trait Test4 {
+ fn test4(a: &Box<bool>);
+}
+
+impl<'a> Test4 for Test3<'a> {
+ fn test4(a: &Box<bool>) {
+ unimplemented!();
+ }
+}
+
+use std::any::Any;
+
+pub fn test5(foo: &mut Box<dyn Any>) {
+ println!("{:?}", foo)
+}
+
+pub fn test6() {
+ let foo: &Box<dyn Any>;
+}
+
+struct Test7<'a> {
+ foo: &'a Box<dyn Any>,
+}
+
+trait Test8 {
+ fn test8(a: &Box<dyn Any>);
+}
+
+impl<'a> Test8 for Test7<'a> {
+ fn test8(a: &Box<dyn Any>) {
+ unimplemented!();
+ }
+}
+
+pub fn test9(foo: &mut Box<dyn Any + Send + Sync>) {
+ let _ = foo;
+}
+
+pub fn test10() {
+ let foo: &Box<dyn Any + Send + 'static>;
+}
+
+struct Test11<'a> {
+ foo: &'a Box<dyn Any + Send>,
+}
+
+trait Test12 {
+ fn test4(a: &Box<dyn Any + 'static>);
+}
+
+impl<'a> Test12 for Test11<'a> {
+ fn test4(a: &Box<dyn Any + 'static>) {
+ unimplemented!();
+ }
+}
+
+pub fn test13(boxed_slice: &mut Box<[i32]>) {
+ // Unconditionally replaces the box pointer.
+ //
+ // This cannot be accomplished if "&mut [i32]" is passed,
+ // and provides a test case where passing a reference to
+ // a Box is valid.
+ let mut data = vec![12];
+ *boxed_slice = data.into_boxed_slice();
+}
+
+// The suggestion should include proper parentheses to avoid a syntax error.
+pub fn test14(_display: &Box<dyn Display>) {}
+pub fn test15(_display: &Box<dyn Display + Send>) {}
+pub fn test16<'a>(_display: &'a Box<dyn Display + 'a>) {}
+
+pub fn test17(_display: &Box<impl Display>) {}
+pub fn test18(_display: &Box<impl Display + Send>) {}
+pub fn test19<'a>(_display: &'a Box<impl Display + 'a>) {}
+
+// This exists only to check what happens when parentheses are already present.
+// Even though the current implementation doesn't put extra parentheses,
+// it's fine that unnecessary parentheses appear in the future for some reason.
+pub fn test20(_display: &Box<(dyn Display + Send)>) {}
+
+fn main() {
+ test1(&mut Box::new(false));
+ test2();
+ test5(&mut (Box::new(false) as Box<dyn Any>));
+ test6();
+ test9(&mut (Box::new(false) as Box<dyn Any + Send + Sync>));
+ test10();
+}
--- /dev/null
- clippy::blacklisted_name,
+#![warn(clippy::all)]
+#![allow(
+ clippy::boxed_local,
+ clippy::needless_pass_by_value,
++ clippy::disallowed_names,
+ unused
+)]
+
+use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, LinkedList, VecDeque};
+
+macro_rules! boxit {
+ ($init:expr, $x:ty) => {
+ let _: Box<$x> = Box::new($init);
+ };
+}
+
+fn test_macro() {
+ boxit!(Vec::new(), Vec<u8>);
+}
+
+fn test1(foo: Box<Vec<bool>>) {}
+
+fn test2(foo: Box<dyn Fn(Vec<u32>)>) {
+ // pass if #31 is fixed
+ foo(vec![1, 2, 3])
+}
+
+fn test3(foo: Box<String>) {}
+
+fn test4(foo: Box<HashMap<String, String>>) {}
+
+fn test5(foo: Box<HashSet<i64>>) {}
+
+fn test6(foo: Box<VecDeque<i32>>) {}
+
+fn test7(foo: Box<LinkedList<i16>>) {}
+
+fn test8(foo: Box<BTreeMap<i8, String>>) {}
+
+fn test9(foo: Box<BTreeSet<u64>>) {}
+
+fn test10(foo: Box<BinaryHeap<u32>>) {}
+
+fn test_local_not_linted() {
+ let _: Box<Vec<bool>>;
+}
+
+// All of these test should be allowed because they are part of the
+// public api and `avoid_breaking_exported_api` is `false` by default.
+pub fn pub_test(foo: Box<Vec<bool>>) {}
+
+pub fn pub_test_ret() -> Box<Vec<bool>> {
+ Box::new(Vec::new())
+}
+
+fn main() {}
--- /dev/null
+// run-rustfix
+#![warn(clippy::cast_abs_to_unsigned)]
+
+fn main() {
+ let x: i32 = -42;
+ let y: u32 = x.unsigned_abs();
+ println!("The absolute value of {} is {}", x, y);
+
+ let a: i32 = -3;
+ let _: usize = a.unsigned_abs() as usize;
+ let _: usize = a.unsigned_abs() as _;
+ let _ = a.unsigned_abs() as usize;
+
+ let a: i64 = -3;
+ let _ = a.unsigned_abs() as usize;
+ let _ = a.unsigned_abs() as u8;
+ let _ = a.unsigned_abs() as u16;
+ let _ = a.unsigned_abs() as u32;
+ let _ = a.unsigned_abs();
+ let _ = a.unsigned_abs() as u128;
+
+ let a: isize = -3;
+ let _ = a.unsigned_abs();
+ let _ = a.unsigned_abs() as u8;
+ let _ = a.unsigned_abs() as u16;
+ let _ = a.unsigned_abs() as u32;
+ let _ = a.unsigned_abs() as u64;
+ let _ = a.unsigned_abs() as u128;
++
++ let _ = (x as i64 - y as i64).unsigned_abs() as u32;
+}
--- /dev/null
+// run-rustfix
+#![warn(clippy::cast_abs_to_unsigned)]
+
+fn main() {
+ let x: i32 = -42;
+ let y: u32 = x.abs() as u32;
+ println!("The absolute value of {} is {}", x, y);
+
+ let a: i32 = -3;
+ let _: usize = a.abs() as usize;
+ let _: usize = a.abs() as _;
+ let _ = a.abs() as usize;
+
+ let a: i64 = -3;
+ let _ = a.abs() as usize;
+ let _ = a.abs() as u8;
+ let _ = a.abs() as u16;
+ let _ = a.abs() as u32;
+ let _ = a.abs() as u64;
+ let _ = a.abs() as u128;
+
+ let a: isize = -3;
+ let _ = a.abs() as usize;
+ let _ = a.abs() as u8;
+ let _ = a.abs() as u16;
+ let _ = a.abs() as u32;
+ let _ = a.abs() as u64;
+ let _ = a.abs() as u128;
++
++ let _ = (x as i64 - y as i64).abs() as u32;
+}
--- /dev/null
- error: aborting due to 16 previous errors
+error: casting the result of `i32::abs()` to u32
+ --> $DIR/cast_abs_to_unsigned.rs:6:18
+ |
+LL | let y: u32 = x.abs() as u32;
+ | ^^^^^^^^^^^^^^ help: replace with: `x.unsigned_abs()`
+ |
+ = note: `-D clippy::cast-abs-to-unsigned` implied by `-D warnings`
+
+error: casting the result of `i32::abs()` to usize
+ --> $DIR/cast_abs_to_unsigned.rs:10:20
+ |
+LL | let _: usize = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i32::abs()` to usize
+ --> $DIR/cast_abs_to_unsigned.rs:11:20
+ |
+LL | let _: usize = a.abs() as _;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i32::abs()` to usize
+ --> $DIR/cast_abs_to_unsigned.rs:12:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to usize
+ --> $DIR/cast_abs_to_unsigned.rs:15:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u8
+ --> $DIR/cast_abs_to_unsigned.rs:16:13
+ |
+LL | let _ = a.abs() as u8;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u16
+ --> $DIR/cast_abs_to_unsigned.rs:17:13
+ |
+LL | let _ = a.abs() as u16;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u32
+ --> $DIR/cast_abs_to_unsigned.rs:18:13
+ |
+LL | let _ = a.abs() as u32;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u64
+ --> $DIR/cast_abs_to_unsigned.rs:19:13
+ |
+LL | let _ = a.abs() as u64;
+ | ^^^^^^^^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `i64::abs()` to u128
+ --> $DIR/cast_abs_to_unsigned.rs:20:13
+ |
+LL | let _ = a.abs() as u128;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to usize
+ --> $DIR/cast_abs_to_unsigned.rs:23:13
+ |
+LL | let _ = a.abs() as usize;
+ | ^^^^^^^^^^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u8
+ --> $DIR/cast_abs_to_unsigned.rs:24:13
+ |
+LL | let _ = a.abs() as u8;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u16
+ --> $DIR/cast_abs_to_unsigned.rs:25:13
+ |
+LL | let _ = a.abs() as u16;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u32
+ --> $DIR/cast_abs_to_unsigned.rs:26:13
+ |
+LL | let _ = a.abs() as u32;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u64
+ --> $DIR/cast_abs_to_unsigned.rs:27:13
+ |
+LL | let _ = a.abs() as u64;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
+error: casting the result of `isize::abs()` to u128
+ --> $DIR/cast_abs_to_unsigned.rs:28:13
+ |
+LL | let _ = a.abs() as u128;
+ | ^^^^^^^ help: replace with: `a.unsigned_abs()`
+
++error: casting the result of `i64::abs()` to u32
++ --> $DIR/cast_abs_to_unsigned.rs:30:13
++ |
++LL | let _ = (x as i64 - y as i64).abs() as u32;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `(x as i64 - y as i64).unsigned_abs()`
++
++error: aborting due to 17 previous errors
+
--- /dev/null
- fn clone_on_copy() {
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::redundant_clone,
+ clippy::deref_addrof,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::vec_init_then_push,
+ clippy::toplevel_ref_arg,
+ clippy::needless_borrow
+)]
+
+use std::cell::RefCell;
+use std::rc::{self, Rc};
+use std::sync::{self, Arc};
+
+fn main() {}
+
+fn is_ascii(ch: char) -> bool {
+ ch.is_ascii()
+}
+
++fn clone_on_copy() -> Option<(i32)> {
+ 42;
+
+ vec![1].clone(); // ok, not a Copy type
+ Some(vec![1]).clone(); // ok, not a Copy type
+ *(&42);
+
+ let rc = RefCell::new(0);
+ *rc.borrow();
+
+ let x = 0u32;
+ x.rotate_left(1);
+
+ #[derive(Clone, Copy)]
+ struct Foo;
+ impl Foo {
+ fn clone(&self) -> u32 {
+ 0
+ }
+ }
+ Foo.clone(); // ok, this is not the clone trait
+
+ macro_rules! m {
+ ($e:expr) => {{ $e }};
+ }
+ m!(42);
+
+ struct Wrap([u32; 2]);
+ impl core::ops::Deref for Wrap {
+ type Target = [u32; 2];
+ fn deref(&self) -> &[u32; 2] {
+ &self.0
+ }
+ }
+ let x = Wrap([0, 0]);
+ (*x)[0];
+
+ let x = 42;
+ let ref y = x.clone(); // ok, binds by reference
+ let ref mut y = x.clone(); // ok, binds by reference
+
+ // Issue #4348
+ let mut x = 43;
+ let _ = &x.clone(); // ok, getting a ref
+ 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate
+ is_ascii('z');
+
+ // Issue #5436
+ let mut vec = Vec::new();
+ vec.push(42);
++
++ // Issue #9277
++ let opt: &Option<i32> = &None;
++ let value = (*opt)?; // operator precedence needed (*opt)?
++ None
+}
--- /dev/null
- fn clone_on_copy() {
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::redundant_clone,
+ clippy::deref_addrof,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::vec_init_then_push,
+ clippy::toplevel_ref_arg,
+ clippy::needless_borrow
+)]
+
+use std::cell::RefCell;
+use std::rc::{self, Rc};
+use std::sync::{self, Arc};
+
+fn main() {}
+
+fn is_ascii(ch: char) -> bool {
+ ch.is_ascii()
+}
+
++fn clone_on_copy() -> Option<(i32)> {
+ 42.clone();
+
+ vec![1].clone(); // ok, not a Copy type
+ Some(vec![1]).clone(); // ok, not a Copy type
+ (&42).clone();
+
+ let rc = RefCell::new(0);
+ rc.borrow().clone();
+
+ let x = 0u32;
+ x.clone().rotate_left(1);
+
+ #[derive(Clone, Copy)]
+ struct Foo;
+ impl Foo {
+ fn clone(&self) -> u32 {
+ 0
+ }
+ }
+ Foo.clone(); // ok, this is not the clone trait
+
+ macro_rules! m {
+ ($e:expr) => {{ $e }};
+ }
+ m!(42).clone();
+
+ struct Wrap([u32; 2]);
+ impl core::ops::Deref for Wrap {
+ type Target = [u32; 2];
+ fn deref(&self) -> &[u32; 2] {
+ &self.0
+ }
+ }
+ let x = Wrap([0, 0]);
+ x.clone()[0];
+
+ let x = 42;
+ let ref y = x.clone(); // ok, binds by reference
+ let ref mut y = x.clone(); // ok, binds by reference
+
+ // Issue #4348
+ let mut x = 43;
+ let _ = &x.clone(); // ok, getting a ref
+ 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate
+ is_ascii('z'.clone());
+
+ // Issue #5436
+ let mut vec = Vec::new();
+ vec.push(42.clone());
++
++ // Issue #9277
++ let opt: &Option<i32> = &None;
++ let value = opt.clone()?; // operator precedence needed (*opt)?
++ None
+}
--- /dev/null
- error: aborting due to 8 previous errors
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:25:5
+ |
+LL | 42.clone();
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+ |
+ = note: `-D clippy::clone-on-copy` implied by `-D warnings`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:29:5
+ |
+LL | (&42).clone();
+ | ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:32:5
+ |
+LL | rc.borrow().clone();
+ | ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()`
+
+error: using `clone` on type `u32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:35:5
+ |
+LL | x.clone().rotate_left(1);
+ | ^^^^^^^^^ help: try removing the `clone` call: `x`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:49:5
+ |
+LL | m!(42).clone();
+ | ^^^^^^^^^^^^^^ help: try removing the `clone` call: `m!(42)`
+
+error: using `clone` on type `[u32; 2]` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:59:5
+ |
+LL | x.clone()[0];
+ | ^^^^^^^^^ help: try dereferencing it: `(*x)`
+
+error: using `clone` on type `char` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:69:14
+ |
+LL | is_ascii('z'.clone());
+ | ^^^^^^^^^^^ help: try removing the `clone` call: `'z'`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
+ --> $DIR/clone_on_copy.rs:73:14
+ |
+LL | vec.push(42.clone());
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+
++error: using `clone` on type `std::option::Option<i32>` which implements the `Copy` trait
++ --> $DIR/clone_on_copy.rs:77:17
++ |
++LL | let value = opt.clone()?; // operator precedence needed (*opt)?
++ | ^^^^^^^^^^^ help: try dereferencing it: `(*opt)`
++
++error: aborting due to 9 previous errors
+
--- /dev/null
- clippy::blacklisted_name,
+#![allow(
+ unused_variables,
++ clippy::disallowed_names,
+ clippy::needless_pass_by_value,
+ dead_code
+)]
+
+/// This should not compile-fail with:
+///
+/// error[E0277]: the trait bound `T: Foo` is not satisfied
+// See rust-lang/rust-clippy#2760.
+
+trait Foo {
+ type Bar;
+}
+
+struct Baz<T: Foo> {
+ bar: T::Bar,
+}
+
+fn take<T: Foo>(baz: Baz<T>) {}
+
+fn main() {}
--- /dev/null
- #![allow(clippy::blacklisted_name, clippy::equatable_if_let)]
+#![warn(clippy::all)]
++#![allow(clippy::disallowed_names, clippy::equatable_if_let)]
+#![allow(unused)]
+
+/// Test for https://github.com/rust-lang/rust-clippy/issues/3462
+
+enum Foo {
+ Bar,
+ Baz,
+}
+
+fn bar(foo: Foo) {
+ macro_rules! baz {
+ () => {
+ if let Foo::Bar = foo {}
+ };
+ }
+
+ baz!();
+ baz!();
+}
+
+fn main() {}
--- /dev/null
- #![allow(clippy::blacklisted_name)]
++#![allow(clippy::disallowed_names)]
+
+pub fn foo(bar: *const u8) {
+ println!("{:#p}", bar);
+}
+
+// Regression test for https://github.com/rust-lang/rust-clippy/issues/4917
+/// <foo
+struct A;
+
+fn main() {}
--- /dev/null
- // ignore-windows
+// ignore-macos
+
+#![feature(no_core, lang_items, start)]
+#![no_core]
+#![allow(clippy::missing_safety_doc)]
+
+#[link(name = "c")]
+extern "C" {}
+
+#[lang = "sized"]
+pub trait Sized {}
+#[lang = "copy"]
+pub trait Copy {}
+#[lang = "freeze"]
+pub unsafe trait Freeze {}
+
+#[lang = "start"]
+fn start<T>(_main: fn() -> T, _argc: isize, _argv: *const *const u8) -> isize {
+ 0
+}
+
+fn main() {}
+
+struct A;
+
+impl A {
+ pub fn as_ref(self) -> &'static str {
+ "A"
+ }
+}
--- /dev/null
- --> $DIR/def_id_nocore.rs:28:19
+error: methods called `as_*` usually take `self` by reference or `self` by mutable reference
++ --> $DIR/def_id_nocore.rs:27:19
+ |
+LL | pub fn as_ref(self) -> &'static str {
+ | ^^^^
+ |
+ = note: `-D clippy::wrong-self-convention` implied by `-D warnings`
+ = help: consider choosing a less ambiguous name
+
+error: aborting due to previous error
+
--- /dev/null
+// run-rustfix
++// aux-build: proc_macro_with_span.rs
+
+#![allow(unused_imports, dead_code)]
+#![deny(clippy::default_trait_access)]
+
++extern crate proc_macro_with_span;
++
++use proc_macro_with_span::with_span;
+use std::default;
+use std::default::Default as D2;
+use std::string;
+
+fn main() {
+ let s1: String = std::string::String::default();
+
+ let s2 = String::default();
+
+ let s3: String = std::string::String::default();
+
+ let s4: String = std::string::String::default();
+
+ let s5 = string::String::default();
+
+ let s6: String = std::string::String::default();
+
+ let s7 = std::string::String::default();
+
+ let s8: String = DefaultFactory::make_t_badly();
+
+ let s9: String = DefaultFactory::make_t_nicely();
+
+ let s10 = DerivedDefault::default();
+
+ let s11: GenericDerivedDefault<String> = GenericDerivedDefault::default();
+
+ let s12 = GenericDerivedDefault::<String>::default();
+
+ let s13 = TupleDerivedDefault::default();
+
+ let s14: TupleDerivedDefault = TupleDerivedDefault::default();
+
+ let s15: ArrayDerivedDefault = ArrayDerivedDefault::default();
+
+ let s16 = ArrayDerivedDefault::default();
+
+ let s17: TupleStructDerivedDefault = TupleStructDerivedDefault::default();
+
+ let s18 = TupleStructDerivedDefault::default();
+
+ let s19 = <DerivedDefault as Default>::default();
+
+ let s20 = UpdateSyntax {
+ s: "foo",
+ ..Default::default()
+ };
+
++ let _s21: String = with_span!(s Default::default());
++
+ println!(
+ "[{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}]",
+ s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13, s14, s15, s16, s17, s18, s19, s20,
+ );
+}
+
+struct DefaultFactory;
+
+impl DefaultFactory {
+ pub fn make_t_badly<T: Default>() -> T {
+ Default::default()
+ }
+
+ pub fn make_t_nicely<T: Default>() -> T {
+ T::default()
+ }
+}
+
+#[derive(Debug, Default)]
+struct DerivedDefault {
+ pub s: String,
+}
+
+#[derive(Debug, Default)]
+struct GenericDerivedDefault<T: Default + std::fmt::Debug> {
+ pub s: T,
+}
+
+#[derive(Debug, Default)]
+struct TupleDerivedDefault {
+ pub s: (String, String),
+}
+
+#[derive(Debug, Default)]
+struct ArrayDerivedDefault {
+ pub s: [String; 10],
+}
+
+#[derive(Debug, Default)]
+struct TupleStructDerivedDefault(String);
+
+#[derive(Debug, Default)]
+struct UpdateSyntax {
+ pub s: &'static str,
+ pub u: u64,
+}
--- /dev/null
+// run-rustfix
++// aux-build: proc_macro_with_span.rs
+
+#![allow(unused_imports, dead_code)]
+#![deny(clippy::default_trait_access)]
+
++extern crate proc_macro_with_span;
++
++use proc_macro_with_span::with_span;
+use std::default;
+use std::default::Default as D2;
+use std::string;
+
+fn main() {
+ let s1: String = Default::default();
+
+ let s2 = String::default();
+
+ let s3: String = D2::default();
+
+ let s4: String = std::default::Default::default();
+
+ let s5 = string::String::default();
+
+ let s6: String = default::Default::default();
+
+ let s7 = std::string::String::default();
+
+ let s8: String = DefaultFactory::make_t_badly();
+
+ let s9: String = DefaultFactory::make_t_nicely();
+
+ let s10 = DerivedDefault::default();
+
+ let s11: GenericDerivedDefault<String> = Default::default();
+
+ let s12 = GenericDerivedDefault::<String>::default();
+
+ let s13 = TupleDerivedDefault::default();
+
+ let s14: TupleDerivedDefault = Default::default();
+
+ let s15: ArrayDerivedDefault = Default::default();
+
+ let s16 = ArrayDerivedDefault::default();
+
+ let s17: TupleStructDerivedDefault = Default::default();
+
+ let s18 = TupleStructDerivedDefault::default();
+
+ let s19 = <DerivedDefault as Default>::default();
+
+ let s20 = UpdateSyntax {
+ s: "foo",
+ ..Default::default()
+ };
+
++ let _s21: String = with_span!(s Default::default());
++
+ println!(
+ "[{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}] [{:?}]",
+ s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13, s14, s15, s16, s17, s18, s19, s20,
+ );
+}
+
+struct DefaultFactory;
+
+impl DefaultFactory {
+ pub fn make_t_badly<T: Default>() -> T {
+ Default::default()
+ }
+
+ pub fn make_t_nicely<T: Default>() -> T {
+ T::default()
+ }
+}
+
+#[derive(Debug, Default)]
+struct DerivedDefault {
+ pub s: String,
+}
+
+#[derive(Debug, Default)]
+struct GenericDerivedDefault<T: Default + std::fmt::Debug> {
+ pub s: T,
+}
+
+#[derive(Debug, Default)]
+struct TupleDerivedDefault {
+ pub s: (String, String),
+}
+
+#[derive(Debug, Default)]
+struct ArrayDerivedDefault {
+ pub s: [String; 10],
+}
+
+#[derive(Debug, Default)]
+struct TupleStructDerivedDefault(String);
+
+#[derive(Debug, Default)]
+struct UpdateSyntax {
+ pub s: &'static str,
+ pub u: u64,
+}
--- /dev/null
- --> $DIR/default_trait_access.rs:11:22
+error: calling `std::string::String::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:4:9
++ --> $DIR/default_trait_access.rs:15:22
+ |
+LL | let s1: String = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
+ |
+note: the lint level is defined here
- --> $DIR/default_trait_access.rs:15:22
++ --> $DIR/default_trait_access.rs:5:9
+ |
+LL | #![deny(clippy::default_trait_access)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: calling `std::string::String::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:17:22
++ --> $DIR/default_trait_access.rs:19:22
+ |
+LL | let s3: String = D2::default();
+ | ^^^^^^^^^^^^^ help: try: `std::string::String::default()`
+
+error: calling `std::string::String::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:21:22
++ --> $DIR/default_trait_access.rs:21:22
+ |
+LL | let s4: String = std::default::Default::default();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
+
+error: calling `std::string::String::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:31:46
++ --> $DIR/default_trait_access.rs:25:22
+ |
+LL | let s6: String = default::Default::default();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()`
+
+error: calling `GenericDerivedDefault::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:37:36
++ --> $DIR/default_trait_access.rs:35:46
+ |
+LL | let s11: GenericDerivedDefault<String> = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `GenericDerivedDefault::default()`
+
+error: calling `TupleDerivedDefault::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:39:36
++ --> $DIR/default_trait_access.rs:41:36
+ |
+LL | let s14: TupleDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `TupleDerivedDefault::default()`
+
+error: calling `ArrayDerivedDefault::default()` is more clear than this expression
- --> $DIR/default_trait_access.rs:43:42
++ --> $DIR/default_trait_access.rs:43:36
+ |
+LL | let s15: ArrayDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `ArrayDerivedDefault::default()`
+
+error: calling `TupleStructDerivedDefault::default()` is more clear than this expression
++ --> $DIR/default_trait_access.rs:47:42
+ |
+LL | let s17: TupleStructDerivedDefault = Default::default();
+ | ^^^^^^^^^^^^^^^^^^ help: try: `TupleStructDerivedDefault::default()`
+
+error: aborting due to 8 previous errors
+
--- /dev/null
--- /dev/null
++#![allow(
++ dead_code,
++ clippy::similar_names,
++ clippy::single_match,
++ clippy::toplevel_ref_arg,
++ unused_mut,
++ unused_variables
++)]
++#![warn(clippy::disallowed_names)]
++
++fn test(foo: ()) {}
++
++fn main() {
++ let foo = 42;
++ let baz = 42;
++ let quux = 42;
++ // Unlike these others, `bar` is actually considered an acceptable name.
++ // Among many other legitimate uses, bar commonly refers to a period of time in music.
++ // See https://github.com/rust-lang/rust-clippy/issues/5225.
++ let bar = 42;
++
++ let food = 42;
++ let foodstuffs = 42;
++ let bazaar = 42;
++
++ match (42, Some(1337), Some(0)) {
++ (foo, Some(baz), quux @ Some(_)) => (),
++ _ => (),
++ }
++}
++
++fn issue_1647(mut foo: u8) {
++ let mut baz = 0;
++ if let Some(mut quux) = Some(42) {}
++}
++
++fn issue_1647_ref() {
++ let ref baz = 0;
++ if let Some(ref quux) = Some(42) {}
++}
++
++fn issue_1647_ref_mut() {
++ let ref mut baz = 0;
++ if let Some(ref mut quux) = Some(42) {}
++}
++
++mod tests {
++ fn issue_7305() {
++ // `disallowed_names` lint should not be triggered inside of the test code.
++ let foo = 0;
++
++ // Check that even in nested functions warning is still not triggered.
++ fn nested() {
++ let foo = 0;
++ }
++ }
++}
--- /dev/null
--- /dev/null
++error: use of a disallowed/placeholder name `foo`
++ --> $DIR/disallowed_names.rs:11:9
++ |
++LL | fn test(foo: ()) {}
++ | ^^^
++ |
++ = note: `-D clippy::disallowed-names` implied by `-D warnings`
++
++error: use of a disallowed/placeholder name `foo`
++ --> $DIR/disallowed_names.rs:14:9
++ |
++LL | let foo = 42;
++ | ^^^
++
++error: use of a disallowed/placeholder name `baz`
++ --> $DIR/disallowed_names.rs:15:9
++ |
++LL | let baz = 42;
++ | ^^^
++
++error: use of a disallowed/placeholder name `quux`
++ --> $DIR/disallowed_names.rs:16:9
++ |
++LL | let quux = 42;
++ | ^^^^
++
++error: use of a disallowed/placeholder name `foo`
++ --> $DIR/disallowed_names.rs:27:10
++ |
++LL | (foo, Some(baz), quux @ Some(_)) => (),
++ | ^^^
++
++error: use of a disallowed/placeholder name `baz`
++ --> $DIR/disallowed_names.rs:27:20
++ |
++LL | (foo, Some(baz), quux @ Some(_)) => (),
++ | ^^^
++
++error: use of a disallowed/placeholder name `quux`
++ --> $DIR/disallowed_names.rs:27:26
++ |
++LL | (foo, Some(baz), quux @ Some(_)) => (),
++ | ^^^^
++
++error: use of a disallowed/placeholder name `foo`
++ --> $DIR/disallowed_names.rs:32:19
++ |
++LL | fn issue_1647(mut foo: u8) {
++ | ^^^
++
++error: use of a disallowed/placeholder name `baz`
++ --> $DIR/disallowed_names.rs:33:13
++ |
++LL | let mut baz = 0;
++ | ^^^
++
++error: use of a disallowed/placeholder name `quux`
++ --> $DIR/disallowed_names.rs:34:21
++ |
++LL | if let Some(mut quux) = Some(42) {}
++ | ^^^^
++
++error: use of a disallowed/placeholder name `baz`
++ --> $DIR/disallowed_names.rs:38:13
++ |
++LL | let ref baz = 0;
++ | ^^^
++
++error: use of a disallowed/placeholder name `quux`
++ --> $DIR/disallowed_names.rs:39:21
++ |
++LL | if let Some(ref quux) = Some(42) {}
++ | ^^^^
++
++error: use of a disallowed/placeholder name `baz`
++ --> $DIR/disallowed_names.rs:43:17
++ |
++LL | let ref mut baz = 0;
++ | ^^^
++
++error: use of a disallowed/placeholder name `quux`
++ --> $DIR/disallowed_names.rs:44:25
++ |
++LL | if let Some(ref mut quux) = Some(42) {}
++ | ^^^^
++
++error: aborting due to 14 previous errors
++
--- /dev/null
- #![allow(clippy::match_same_arms, clippy::logic_bug)]
+#![warn(clippy::diverging_sub_expression)]
++#![allow(clippy::match_same_arms, clippy::overly_complex_bool_expr)]
+#[allow(clippy::empty_loop)]
+fn diverge() -> ! {
+ loop {}
+}
+
+struct A;
+
+impl A {
+ fn foo(&self) -> ! {
+ diverge()
+ }
+}
+
+#[allow(unused_variables, clippy::unnecessary_operation, clippy::short_circuit_statement)]
+fn main() {
+ let b = true;
+ b || diverge();
+ b || A.foo();
+}
+
+#[allow(dead_code, unused_variables)]
+fn foobar() {
+ loop {
+ let x = match 5 {
+ 4 => return,
+ 5 => continue,
+ 6 => true || return,
+ 7 => true || continue,
+ 8 => break,
+ 9 => diverge(),
+ 3 => true || diverge(),
+ 10 => match 42 {
+ 99 => return,
+ _ => true || panic!("boo"),
+ },
+ _ => true || break,
+ };
+ }
+}
--- /dev/null
- // ignore-windows
+// compile-flags: -Clink-arg=-nostartfiles
+// ignore-macos
+
+#![warn(clippy::empty_loop)]
+#![feature(lang_items, start, libc)]
+#![no_std]
+
+use core::panic::PanicInfo;
+
+#[start]
+fn main(argc: isize, argv: *const *const u8) -> isize {
+ // This should trigger the lint
+ loop {}
+}
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+ // This should NOT trigger the lint
+ loop {}
+}
+
+#[lang = "eh_personality"]
+extern "C" fn eh_personality() {
+ // This should also trigger the lint
+ loop {}
+}
--- /dev/null
- --> $DIR/empty_loop_no_std.rs:14:5
+error: empty `loop {}` wastes CPU cycles
- --> $DIR/empty_loop_no_std.rs:26:5
++ --> $DIR/empty_loop_no_std.rs:13:5
+ |
+LL | loop {}
+ | ^^^^^^^
+ |
+ = note: `-D clippy::empty-loop` implied by `-D warnings`
+ = help: you should either use `panic!()` or add a call pausing or sleeping the thread to the loop body
+
+error: empty `loop {}` wastes CPU cycles
++ --> $DIR/empty_loop_no_std.rs:25:5
+ |
+LL | loop {}
+ | ^^^^^^^
+ |
+ = help: you should either use `panic!()` or add a call pausing or sleeping the thread to the loop body
+
+error: aborting due to 2 previous errors
+
--- /dev/null
- = help: if this value is an `None`, it will panic
+error: used `expect()` on `an Option` value
+ --> $DIR/expect.rs:5:13
+ |
+LL | let _ = opt.expect("");
+ | ^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::expect-used` implied by `-D warnings`
++ = help: if this value is `None`, it will panic
+
+error: used `expect()` on `a Result` value
+ --> $DIR/expect.rs:10:13
+ |
+LL | let _ = res.expect("");
+ | ^^^^^^^^^^^^^^
+ |
+ = help: if this value is an `Err`, it will panic
+
+error: aborting due to 2 previous errors
+
--- /dev/null
- #[expect(clippy::logic_bug)]
+// check-pass
+#![feature(lint_reasons)]
+//! This file tests the `#[expect]` attribute implementation for tool lints. The same
+//! file is used to test clippy and rustdoc. Any changes to this file should be synced
+//! to the other test files as well.
+//!
+//! Expectations:
+//! * rustc: only rustc lint expectations are emitted
+//! * clippy: rustc and Clippy's expectations are emitted
+//! * rustdoc: only rustdoc lint expectations are emitted
+//!
+//! This test can't cover every lint from Clippy, rustdoc and potentially other
+//! tools that will be developed. This therefore only tests a small subset of lints
+#![expect(rustdoc::missing_crate_level_docs)]
+
+mod rustc_ok {
+ //! See <https://doc.rust-lang.org/rustc/lints/index.html>
+
+ #[expect(dead_code)]
+ pub fn rustc_lints() {
+ let x = 42.0;
+
+ #[expect(illegal_floating_point_literal_pattern)]
+ match x {
+ 5.0 => {}
+ 6.0 => {}
+ _ => {}
+ }
+ }
+}
+
+mod rustc_warn {
+ //! See <https://doc.rust-lang.org/rustc/lints/index.html>
+
+ #[expect(dead_code)]
+ pub fn rustc_lints() {
+ let x = 42;
+
+ #[expect(illegal_floating_point_literal_pattern)]
+ match x {
+ 5 => {}
+ 6 => {}
+ _ => {}
+ }
+ }
+}
+
+pub mod rustdoc_ok {
+ //! See <https://doc.rust-lang.org/rustdoc/lints.html>
+
+ #[expect(rustdoc::broken_intra_doc_links)]
+ /// I want to link to [`Nonexistent`] but it doesn't exist!
+ pub fn foo() {}
+
+ #[expect(rustdoc::invalid_html_tags)]
+ /// <h1>
+ pub fn bar() {}
+
+ #[expect(rustdoc::bare_urls)]
+ /// http://example.org
+ pub fn baz() {}
+}
+
+pub mod rustdoc_warn {
+ //! See <https://doc.rust-lang.org/rustdoc/lints.html>
+
+ #[expect(rustdoc::broken_intra_doc_links)]
+ /// I want to link to [`bar`] but it doesn't exist!
+ pub fn foo() {}
+
+ #[expect(rustdoc::invalid_html_tags)]
+ /// <h1></h1>
+ pub fn bar() {}
+
+ #[expect(rustdoc::bare_urls)]
+ /// <http://example.org>
+ pub fn baz() {}
+}
+
+mod clippy_ok {
+ //! See <https://rust-lang.github.io/rust-clippy/master/index.html>
+
+ #[expect(clippy::almost_swapped)]
+ fn foo() {
+ let mut a = 0;
+ let mut b = 9;
+ a = b;
+ b = a;
+ }
+
+ #[expect(clippy::bytes_nth)]
+ fn bar() {
+ let _ = "Hello".bytes().nth(3);
+ }
+
+ #[expect(clippy::if_same_then_else)]
+ fn baz() {
+ let _ = if true { 42 } else { 42 };
+ }
+
- #[expect(clippy::logic_bug)]
++ #[expect(clippy::overly_complex_bool_expr)]
+ fn burger() {
+ let a = false;
+ let b = true;
+
+ if a && b || a {}
+ }
+}
+
+mod clippy_warn {
+ //! See <https://rust-lang.github.io/rust-clippy/master/index.html>
+
+ #[expect(clippy::almost_swapped)]
+ fn foo() {
+ let mut a = 0;
+ let mut b = 9;
+ a = b;
+ }
+
+ #[expect(clippy::bytes_nth)]
+ fn bar() {
+ let _ = "Hello".as_bytes().get(3);
+ }
+
+ #[expect(clippy::if_same_then_else)]
+ fn baz() {
+ let _ = if true { 33 } else { 42 };
+ }
+
++ #[expect(clippy::overly_complex_bool_expr)]
+ fn burger() {
+ let a = false;
+ let b = true;
+ let c = false;
+
+ if a && b || c {}
+ }
+}
+
+fn main() {
+ rustc_warn::rustc_lints();
+}
--- /dev/null
- LL | #[expect(clippy::logic_bug)]
- | ^^^^^^^^^^^^^^^^^
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:35:14
+ |
+LL | #[expect(dead_code)]
+ | ^^^^^^^^^
+ |
+ = note: `-D unfulfilled-lint-expectations` implied by `-D warnings`
+
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:39:18
+ |
+LL | #[expect(illegal_floating_point_literal_pattern)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:113:14
+ |
+LL | #[expect(clippy::almost_swapped)]
+ | ^^^^^^^^^^^^^^^^^^^^^^
+
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:120:14
+ |
+LL | #[expect(clippy::bytes_nth)]
+ | ^^^^^^^^^^^^^^^^^
+
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:125:14
+ |
+LL | #[expect(clippy::if_same_then_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: this lint expectation is unfulfilled
+ --> $DIR/expect_tool_lint_rfc_2383.rs:130:14
+ |
++LL | #[expect(clippy::overly_complex_bool_expr)]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
+
--- /dev/null
+// run-rustfix
+
++#![feature(closure_lifetime_binder)]
+#![warn(clippy::explicit_auto_deref)]
+#![allow(
+ dead_code,
+ unused_braces,
+ clippy::borrowed_box,
+ clippy::needless_borrow,
+ clippy::needless_return,
+ clippy::ptr_arg,
+ clippy::redundant_field_names,
+ clippy::too_many_arguments,
+ clippy::borrow_deref_ref,
+ clippy::let_unit_value
+)]
+
+trait CallableStr {
+ type T: Fn(&str);
+ fn callable_str(&self) -> Self::T;
+}
+impl CallableStr for () {
+ type T = fn(&str);
+ fn callable_str(&self) -> Self::T {
+ fn f(_: &str) {}
+ f
+ }
+}
+impl CallableStr for i32 {
+ type T = <() as CallableStr>::T;
+ fn callable_str(&self) -> Self::T {
+ ().callable_str()
+ }
+}
+
+trait CallableT<U: ?Sized> {
+ type T: Fn(&U);
+ fn callable_t(&self) -> Self::T;
+}
+impl<U: ?Sized> CallableT<U> for () {
+ type T = fn(&U);
+ fn callable_t(&self) -> Self::T {
+ fn f<U: ?Sized>(_: &U) {}
+ f::<U>
+ }
+}
+impl<U: ?Sized> CallableT<U> for i32 {
+ type T = <() as CallableT<U>>::T;
+ fn callable_t(&self) -> Self::T {
+ ().callable_t()
+ }
+}
+
+fn f_str(_: &str) {}
+fn f_string(_: &String) {}
+fn f_t<T>(_: T) {}
+fn f_ref_t<T: ?Sized>(_: &T) {}
+
+fn f_str_t<T>(_: &str, _: T) {}
+
+fn f_box_t<T>(_: &Box<T>) {}
+
+extern "C" {
+ fn var(_: u32, ...);
+}
+
+fn main() {
+ let s = String::new();
+
+ let _: &str = &s;
++ let _: &str = &{ String::new() };
++ let _: &str = &mut { String::new() };
+ let _ = &*s; // Don't lint. Inferred type would change.
+ let _: &_ = &*s; // Don't lint. Inferred type would change.
+
+ f_str(&s);
+ f_t(&*s); // Don't lint. Inferred type would change.
+ f_ref_t(&*s); // Don't lint. Inferred type would change.
+
+ f_str_t(&s, &*s); // Don't lint second param.
+
+ let b = Box::new(Box::new(Box::new(5)));
+ let _: &Box<i32> = &b;
+ let _: &Box<_> = &**b; // Don't lint. Inferred type would change.
+
+ f_box_t(&**b); // Don't lint. Inferred type would change.
+
+ let c = |_x: &str| ();
+ c(&s);
+
+ let c = |_x| ();
+ c(&*s); // Don't lint. Inferred type would change.
+
+ fn _f(x: &String) -> &str {
+ x
+ }
+
+ fn _f1(x: &String) -> &str {
+ { x }
+ }
+
+ fn _f2(x: &String) -> &str {
+ { x }
+ }
+
+ fn _f3(x: &Box<Box<Box<i32>>>) -> &Box<i32> {
+ x
+ }
+
+ fn _f4(
+ x: String,
+ f1: impl Fn(&str),
+ f2: &dyn Fn(&str),
+ f3: fn(&str),
+ f4: impl CallableStr,
+ f5: <() as CallableStr>::T,
+ f6: <i32 as CallableStr>::T,
+ f7: &dyn CallableStr<T = fn(&str)>,
+ f8: impl CallableT<str>,
+ f9: <() as CallableT<str>>::T,
+ f10: <i32 as CallableT<str>>::T,
+ f11: &dyn CallableT<str, T = fn(&str)>,
+ ) {
+ f1(&x);
+ f2(&x);
+ f3(&x);
+ f4.callable_str()(&x);
+ f5(&x);
+ f6(&x);
+ f7.callable_str()(&x);
+ f8.callable_t()(&x);
+ f9(&x);
+ f10(&x);
+ f11.callable_t()(&x);
+ }
+
+ struct S1<'a>(&'a str);
+ let _ = S1(&s);
+
+ struct S2<'a> {
+ s: &'a str,
+ }
+ let _ = S2 { s: &s };
+
+ struct S3<'a, T: ?Sized>(&'a T);
+ let _ = S3(&*s); // Don't lint. Inferred type would change.
+
+ struct S4<'a, T: ?Sized> {
+ s: &'a T,
+ }
+ let _ = S4 { s: &*s }; // Don't lint. Inferred type would change.
+
+ enum E1<'a> {
+ S1(&'a str),
+ S2 { s: &'a str },
+ }
+ impl<'a> E1<'a> {
+ fn m1(s: &'a String) {
+ let _ = Self::S1(s);
+ let _ = Self::S2 { s: s };
+ }
+ }
+ let _ = E1::S1(&s);
+ let _ = E1::S2 { s: &s };
+
+ enum E2<'a, T: ?Sized> {
+ S1(&'a T),
+ S2 { s: &'a T },
+ }
+ let _ = E2::S1(&*s); // Don't lint. Inferred type would change.
+ let _ = E2::S2 { s: &*s }; // Don't lint. Inferred type would change.
+
+ let ref_s = &s;
+ let _: &String = &*ref_s; // Don't lint reborrow.
+ f_string(&*ref_s); // Don't lint reborrow.
+
+ struct S5 {
+ foo: u32,
+ }
+ let b = Box::new(Box::new(S5 { foo: 5 }));
+ let _ = b.foo;
+ let _ = b.foo;
+ let _ = b.foo;
+
+ struct S6 {
+ foo: S5,
+ }
+ impl core::ops::Deref for S6 {
+ type Target = S5;
+ fn deref(&self) -> &Self::Target {
+ &self.foo
+ }
+ }
+ let s6 = S6 { foo: S5 { foo: 5 } };
+ let _ = (*s6).foo; // Don't lint. `S6` also has a field named `foo`
+
+ let ref_str = &"foo";
+ let _ = f_str(ref_str);
+ let ref_ref_str = &ref_str;
+ let _ = f_str(ref_ref_str);
+
+ fn _f5(x: &u32) -> u32 {
+ if true {
+ *x
+ } else {
+ return *x;
+ }
+ }
+
+ f_str(&&ref_str); // `needless_borrow` will suggest removing both references
+ f_str(&ref_str); // `needless_borrow` will suggest removing only one reference
+
+ let x = &&40;
+ unsafe {
+ var(0, &**x);
+ }
+
+ let s = &"str";
+ let _ = || return *s;
+ let _ = || -> &'static str { return s };
++
++ struct X;
++ struct Y(X);
++ impl core::ops::Deref for Y {
++ type Target = X;
++ fn deref(&self) -> &Self::Target {
++ &self.0
++ }
++ }
++ let _: &X = &*{ Y(X) };
++ let _: &X = &*match 0 {
++ #[rustfmt::skip]
++ 0 => { Y(X) },
++ _ => panic!(),
++ };
++ let _: &X = &*if true { Y(X) } else { panic!() };
++
++ fn deref_to_u<U, T: core::ops::Deref<Target = U>>(x: &T) -> &U {
++ x
++ }
++
++ let _ = |x: &'static Box<dyn Iterator<Item = u32>>| -> &'static dyn Iterator<Item = u32> { &**x };
++ fn ret_any(x: &Box<dyn std::any::Any>) -> &dyn std::any::Any {
++ &**x
++ }
++
++ let x = String::new();
++ let _: *const str = &*x;
++
++ struct S7([u32; 1]);
++ impl core::ops::Deref for S7 {
++ type Target = [u32; 1];
++ fn deref(&self) -> &Self::Target {
++ &self.0
++ }
++ }
++ let x = S7([0]);
++ let _: &[u32] = &*x;
++
++ let c1 = |_: &Vec<&u32>| {};
++ let x = &&vec![&1u32];
++ c1(x);
++ let _ = for<'a, 'b> |x: &'a &'a Vec<&'b u32>, b: bool| -> &'a Vec<&'b u32> {
++ if b {
++ return x;
++ }
++ x
++ };
+}
--- /dev/null
+// run-rustfix
+
++#![feature(closure_lifetime_binder)]
+#![warn(clippy::explicit_auto_deref)]
+#![allow(
+ dead_code,
+ unused_braces,
+ clippy::borrowed_box,
+ clippy::needless_borrow,
+ clippy::needless_return,
+ clippy::ptr_arg,
+ clippy::redundant_field_names,
+ clippy::too_many_arguments,
+ clippy::borrow_deref_ref,
+ clippy::let_unit_value
+)]
+
+trait CallableStr {
+ type T: Fn(&str);
+ fn callable_str(&self) -> Self::T;
+}
+impl CallableStr for () {
+ type T = fn(&str);
+ fn callable_str(&self) -> Self::T {
+ fn f(_: &str) {}
+ f
+ }
+}
+impl CallableStr for i32 {
+ type T = <() as CallableStr>::T;
+ fn callable_str(&self) -> Self::T {
+ ().callable_str()
+ }
+}
+
+trait CallableT<U: ?Sized> {
+ type T: Fn(&U);
+ fn callable_t(&self) -> Self::T;
+}
+impl<U: ?Sized> CallableT<U> for () {
+ type T = fn(&U);
+ fn callable_t(&self) -> Self::T {
+ fn f<U: ?Sized>(_: &U) {}
+ f::<U>
+ }
+}
+impl<U: ?Sized> CallableT<U> for i32 {
+ type T = <() as CallableT<U>>::T;
+ fn callable_t(&self) -> Self::T {
+ ().callable_t()
+ }
+}
+
+fn f_str(_: &str) {}
+fn f_string(_: &String) {}
+fn f_t<T>(_: T) {}
+fn f_ref_t<T: ?Sized>(_: &T) {}
+
+fn f_str_t<T>(_: &str, _: T) {}
+
+fn f_box_t<T>(_: &Box<T>) {}
+
+extern "C" {
+ fn var(_: u32, ...);
+}
+
+fn main() {
+ let s = String::new();
+
+ let _: &str = &*s;
++ let _: &str = &*{ String::new() };
++ let _: &str = &mut *{ String::new() };
+ let _ = &*s; // Don't lint. Inferred type would change.
+ let _: &_ = &*s; // Don't lint. Inferred type would change.
+
+ f_str(&*s);
+ f_t(&*s); // Don't lint. Inferred type would change.
+ f_ref_t(&*s); // Don't lint. Inferred type would change.
+
+ f_str_t(&*s, &*s); // Don't lint second param.
+
+ let b = Box::new(Box::new(Box::new(5)));
+ let _: &Box<i32> = &**b;
+ let _: &Box<_> = &**b; // Don't lint. Inferred type would change.
+
+ f_box_t(&**b); // Don't lint. Inferred type would change.
+
+ let c = |_x: &str| ();
+ c(&*s);
+
+ let c = |_x| ();
+ c(&*s); // Don't lint. Inferred type would change.
+
+ fn _f(x: &String) -> &str {
+ &**x
+ }
+
+ fn _f1(x: &String) -> &str {
+ { &**x }
+ }
+
+ fn _f2(x: &String) -> &str {
+ &**{ x }
+ }
+
+ fn _f3(x: &Box<Box<Box<i32>>>) -> &Box<i32> {
+ &***x
+ }
+
+ fn _f4(
+ x: String,
+ f1: impl Fn(&str),
+ f2: &dyn Fn(&str),
+ f3: fn(&str),
+ f4: impl CallableStr,
+ f5: <() as CallableStr>::T,
+ f6: <i32 as CallableStr>::T,
+ f7: &dyn CallableStr<T = fn(&str)>,
+ f8: impl CallableT<str>,
+ f9: <() as CallableT<str>>::T,
+ f10: <i32 as CallableT<str>>::T,
+ f11: &dyn CallableT<str, T = fn(&str)>,
+ ) {
+ f1(&*x);
+ f2(&*x);
+ f3(&*x);
+ f4.callable_str()(&*x);
+ f5(&*x);
+ f6(&*x);
+ f7.callable_str()(&*x);
+ f8.callable_t()(&*x);
+ f9(&*x);
+ f10(&*x);
+ f11.callable_t()(&*x);
+ }
+
+ struct S1<'a>(&'a str);
+ let _ = S1(&*s);
+
+ struct S2<'a> {
+ s: &'a str,
+ }
+ let _ = S2 { s: &*s };
+
+ struct S3<'a, T: ?Sized>(&'a T);
+ let _ = S3(&*s); // Don't lint. Inferred type would change.
+
+ struct S4<'a, T: ?Sized> {
+ s: &'a T,
+ }
+ let _ = S4 { s: &*s }; // Don't lint. Inferred type would change.
+
+ enum E1<'a> {
+ S1(&'a str),
+ S2 { s: &'a str },
+ }
+ impl<'a> E1<'a> {
+ fn m1(s: &'a String) {
+ let _ = Self::S1(&**s);
+ let _ = Self::S2 { s: &**s };
+ }
+ }
+ let _ = E1::S1(&*s);
+ let _ = E1::S2 { s: &*s };
+
+ enum E2<'a, T: ?Sized> {
+ S1(&'a T),
+ S2 { s: &'a T },
+ }
+ let _ = E2::S1(&*s); // Don't lint. Inferred type would change.
+ let _ = E2::S2 { s: &*s }; // Don't lint. Inferred type would change.
+
+ let ref_s = &s;
+ let _: &String = &*ref_s; // Don't lint reborrow.
+ f_string(&*ref_s); // Don't lint reborrow.
+
+ struct S5 {
+ foo: u32,
+ }
+ let b = Box::new(Box::new(S5 { foo: 5 }));
+ let _ = b.foo;
+ let _ = (*b).foo;
+ let _ = (**b).foo;
+
+ struct S6 {
+ foo: S5,
+ }
+ impl core::ops::Deref for S6 {
+ type Target = S5;
+ fn deref(&self) -> &Self::Target {
+ &self.foo
+ }
+ }
+ let s6 = S6 { foo: S5 { foo: 5 } };
+ let _ = (*s6).foo; // Don't lint. `S6` also has a field named `foo`
+
+ let ref_str = &"foo";
+ let _ = f_str(*ref_str);
+ let ref_ref_str = &ref_str;
+ let _ = f_str(**ref_ref_str);
+
+ fn _f5(x: &u32) -> u32 {
+ if true {
+ *x
+ } else {
+ return *x;
+ }
+ }
+
+ f_str(&&*ref_str); // `needless_borrow` will suggest removing both references
+ f_str(&&**ref_str); // `needless_borrow` will suggest removing only one reference
+
+ let x = &&40;
+ unsafe {
+ var(0, &**x);
+ }
+
+ let s = &"str";
+ let _ = || return *s;
+ let _ = || -> &'static str { return *s };
++
++ struct X;
++ struct Y(X);
++ impl core::ops::Deref for Y {
++ type Target = X;
++ fn deref(&self) -> &Self::Target {
++ &self.0
++ }
++ }
++ let _: &X = &*{ Y(X) };
++ let _: &X = &*match 0 {
++ #[rustfmt::skip]
++ 0 => { Y(X) },
++ _ => panic!(),
++ };
++ let _: &X = &*if true { Y(X) } else { panic!() };
++
++ fn deref_to_u<U, T: core::ops::Deref<Target = U>>(x: &T) -> &U {
++ &**x
++ }
++
++ let _ = |x: &'static Box<dyn Iterator<Item = u32>>| -> &'static dyn Iterator<Item = u32> { &**x };
++ fn ret_any(x: &Box<dyn std::any::Any>) -> &dyn std::any::Any {
++ &**x
++ }
++
++ let x = String::new();
++ let _: *const str = &*x;
++
++ struct S7([u32; 1]);
++ impl core::ops::Deref for S7 {
++ type Target = [u32; 1];
++ fn deref(&self) -> &Self::Target {
++ &self.0
++ }
++ }
++ let x = S7([0]);
++ let _: &[u32] = &*x;
++
++ let c1 = |_: &Vec<&u32>| {};
++ let x = &&vec![&1u32];
++ c1(*x);
++ let _ = for<'a, 'b> |x: &'a &'a Vec<&'b u32>, b: bool| -> &'a Vec<&'b u32> {
++ if b {
++ return *x;
++ }
++ *x
++ };
+}
--- /dev/null
- --> $DIR/explicit_auto_deref.rs:69:20
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:70:19
+ |
+LL | let _: &str = &*s;
- --> $DIR/explicit_auto_deref.rs:73:12
++ | ^^^ help: try this: `&s`
+ |
+ = note: `-D clippy::explicit-auto-deref` implied by `-D warnings`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:71:19
++ |
++LL | let _: &str = &*{ String::new() };
++ | ^^^^^^^^^^^^^^^^^^^ help: try this: `&{ String::new() }`
++
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:72:19
++ |
++LL | let _: &str = &mut *{ String::new() };
++ | ^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut { String::new() }`
++
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:76:11
+ |
+LL | f_str(&*s);
- --> $DIR/explicit_auto_deref.rs:77:14
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:80:13
+ |
+LL | f_str_t(&*s, &*s); // Don't lint second param.
- --> $DIR/explicit_auto_deref.rs:80:25
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- | ^^^ help: try this: `b`
++ --> $DIR/explicit_auto_deref.rs:83:24
+ |
+LL | let _: &Box<i32> = &**b;
- --> $DIR/explicit_auto_deref.rs:86:8
++ | ^^^^ help: try this: `&b`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:89:7
+ |
+LL | c(&*s);
- --> $DIR/explicit_auto_deref.rs:92:9
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:96:11
++ --> $DIR/explicit_auto_deref.rs:95:9
+ |
+LL | &**x
+ | ^^^^ help: try this: `x`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:100:9
++ --> $DIR/explicit_auto_deref.rs:99:11
+ |
+LL | { &**x }
+ | ^^^^ help: try this: `x`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:104:9
++ --> $DIR/explicit_auto_deref.rs:103:9
+ |
+LL | &**{ x }
+ | ^^^^^^^^ help: try this: `{ x }`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:121:13
++ --> $DIR/explicit_auto_deref.rs:107:9
+ |
+LL | &***x
+ | ^^^^^ help: try this: `x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:124:12
+ |
+LL | f1(&*x);
- --> $DIR/explicit_auto_deref.rs:122:13
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:125:12
+ |
+LL | f2(&*x);
- --> $DIR/explicit_auto_deref.rs:123:13
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:126:12
+ |
+LL | f3(&*x);
- --> $DIR/explicit_auto_deref.rs:124:28
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:127:27
+ |
+LL | f4.callable_str()(&*x);
- --> $DIR/explicit_auto_deref.rs:125:13
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:128:12
+ |
+LL | f5(&*x);
- --> $DIR/explicit_auto_deref.rs:126:13
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:129:12
+ |
+LL | f6(&*x);
- --> $DIR/explicit_auto_deref.rs:127:28
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:130:27
+ |
+LL | f7.callable_str()(&*x);
- --> $DIR/explicit_auto_deref.rs:128:26
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:131:25
+ |
+LL | f8.callable_t()(&*x);
- --> $DIR/explicit_auto_deref.rs:129:13
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:132:12
+ |
+LL | f9(&*x);
- --> $DIR/explicit_auto_deref.rs:130:14
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:133:13
+ |
+LL | f10(&*x);
- --> $DIR/explicit_auto_deref.rs:131:27
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `x`
++ --> $DIR/explicit_auto_deref.rs:134:26
+ |
+LL | f11.callable_t()(&*x);
- --> $DIR/explicit_auto_deref.rs:135:17
++ | ^^^ help: try this: `&x`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:138:16
+ |
+LL | let _ = S1(&*s);
- --> $DIR/explicit_auto_deref.rs:140:22
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:143:21
+ |
+LL | let _ = S2 { s: &*s };
- --> $DIR/explicit_auto_deref.rs:156:30
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:157:35
++ --> $DIR/explicit_auto_deref.rs:159:30
+ |
+LL | let _ = Self::S1(&**s);
+ | ^^^^ help: try this: `s`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:160:21
++ --> $DIR/explicit_auto_deref.rs:160:35
+ |
+LL | let _ = Self::S2 { s: &**s };
+ | ^^^^ help: try this: `s`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:163:20
+ |
+LL | let _ = E1::S1(&*s);
- --> $DIR/explicit_auto_deref.rs:161:26
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- | ^^ help: try this: `s`
++ --> $DIR/explicit_auto_deref.rs:164:25
+ |
+LL | let _ = E1::S2 { s: &*s };
- --> $DIR/explicit_auto_deref.rs:179:13
++ | ^^^ help: try this: `&s`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:180:13
++ --> $DIR/explicit_auto_deref.rs:182:13
+ |
+LL | let _ = (*b).foo;
+ | ^^^^ help: try this: `b`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:195:19
++ --> $DIR/explicit_auto_deref.rs:183:13
+ |
+LL | let _ = (**b).foo;
+ | ^^^^^ help: try this: `b`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:197:19
++ --> $DIR/explicit_auto_deref.rs:198:19
+ |
+LL | let _ = f_str(*ref_str);
+ | ^^^^^^^^ help: try this: `ref_str`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:207:13
++ --> $DIR/explicit_auto_deref.rs:200:19
+ |
+LL | let _ = f_str(**ref_ref_str);
+ | ^^^^^^^^^^^^^ help: try this: `ref_ref_str`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:208:12
++ --> $DIR/explicit_auto_deref.rs:210:13
+ |
+LL | f_str(&&*ref_str); // `needless_borrow` will suggest removing both references
+ | ^^^^^^^^ help: try this: `ref_str`
+
+error: deref which would be done by auto-deref
- --> $DIR/explicit_auto_deref.rs:217:41
++ --> $DIR/explicit_auto_deref.rs:211:12
+ |
+LL | f_str(&&**ref_str); // `needless_borrow` will suggest removing only one reference
+ | ^^^^^^^^^^ help: try this: `ref_str`
+
+error: deref which would be done by auto-deref
- error: aborting due to 33 previous errors
++ --> $DIR/explicit_auto_deref.rs:220:41
+ |
+LL | let _ = || -> &'static str { return *s };
+ | ^^ help: try this: `s`
+
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:239:9
++ |
++LL | &**x
++ | ^^^^ help: try this: `x`
++
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:262:8
++ |
++LL | c1(*x);
++ | ^^ help: try this: `x`
++
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:265:20
++ |
++LL | return *x;
++ | ^^ help: try this: `x`
++
++error: deref which would be done by auto-deref
++ --> $DIR/explicit_auto_deref.rs:267:9
++ |
++LL | *x
++ | ^^ help: try this: `x`
++
++error: aborting due to 39 previous errors
+
--- /dev/null
- clippy::blacklisted_name,
+#![warn(clippy::if_same_then_else)]
+#![allow(
++ clippy::disallowed_names,
+ clippy::eq_op,
+ clippy::never_loop,
+ clippy::no_effect,
+ clippy::unused_unit,
+ clippy::zero_divided_by_zero,
+ clippy::branches_sharing_code,
+ dead_code,
+ unreachable_code
+)]
+
+struct Foo {
+ bar: u8,
+}
+
+fn foo() -> bool {
+ unimplemented!()
+}
+
+fn if_same_then_else() {
+ if true {
+ Foo { bar: 42 };
+ 0..10;
+ ..;
+ 0..;
+ ..10;
+ 0..=10;
+ foo();
+ } else {
+ //~ ERROR same body as `if` block
+ Foo { bar: 42 };
+ 0..10;
+ ..;
+ 0..;
+ ..10;
+ 0..=10;
+ foo();
+ }
+
+ if true {
+ Foo { bar: 42 };
+ } else {
+ Foo { bar: 43 };
+ }
+
+ if true {
+ ();
+ } else {
+ ()
+ }
+
+ if true {
+ 0..10;
+ } else {
+ 0..=10;
+ }
+
+ if true {
+ foo();
+ foo();
+ } else {
+ foo();
+ }
+
+ let _ = if true {
+ 0.0
+ } else {
+ //~ ERROR same body as `if` block
+ 0.0
+ };
+
+ let _ = if true {
+ -0.0
+ } else {
+ //~ ERROR same body as `if` block
+ -0.0
+ };
+
+ let _ = if true { 0.0 } else { -0.0 };
+
+ // Different NaNs
+ let _ = if true { 0.0 / 0.0 } else { f32::NAN };
+
+ if true {
+ foo();
+ }
+
+ let _ = if true {
+ 42
+ } else {
+ //~ ERROR same body as `if` block
+ 42
+ };
+
+ if true {
+ let bar = if true { 42 } else { 43 };
+
+ while foo() {
+ break;
+ }
+ bar + 1;
+ } else {
+ //~ ERROR same body as `if` block
+ let bar = if true { 42 } else { 43 };
+
+ while foo() {
+ break;
+ }
+ bar + 1;
+ }
+
+ if true {
+ let _ = match 42 {
+ 42 => 1,
+ a if a > 0 => 2,
+ 10..=15 => 3,
+ _ => 4,
+ };
+ } else if false {
+ foo();
+ } else if foo() {
+ let _ = match 42 {
+ 42 => 1,
+ a if a > 0 => 2,
+ 10..=15 => 3,
+ _ => 4,
+ };
+ }
+}
+
+// Issue #2423. This was causing an ICE.
+fn func() {
+ if true {
+ f(&[0; 62]);
+ f(&[0; 4]);
+ f(&[0; 3]);
+ } else {
+ f(&[0; 62]);
+ f(&[0; 6]);
+ f(&[0; 6]);
+ }
+}
+
+fn f(val: &[u8]) {}
+
+mod issue_5698 {
+ fn mul_not_always_commutative(x: i32, y: i32) -> i32 {
+ if x == 42 {
+ x * y
+ } else if x == 21 {
+ y * x
+ } else {
+ 0
+ }
+ }
+}
+
+mod issue_8836 {
+ fn do_not_lint() {
+ if true {
+ todo!()
+ } else {
+ todo!()
+ }
+ if true {
+ todo!();
+ } else {
+ todo!();
+ }
+ if true {
+ unimplemented!()
+ } else {
+ unimplemented!()
+ }
+ if true {
+ unimplemented!();
+ } else {
+ unimplemented!();
+ }
+
+ if true {
+ println!("FOO");
+ todo!();
+ } else {
+ println!("FOO");
+ todo!();
+ }
+
+ if true {
+ println!("FOO");
+ unimplemented!();
+ } else {
+ println!("FOO");
+ unimplemented!();
+ }
+
+ if true {
+ println!("FOO");
+ todo!()
+ } else {
+ println!("FOO");
+ todo!()
+ }
+
+ if true {
+ println!("FOO");
+ unimplemented!()
+ } else {
+ println!("FOO");
+ unimplemented!()
+ }
+ }
+}
+
+fn main() {}
--- /dev/null
- clippy::blacklisted_name,
+#![warn(clippy::if_same_then_else)]
+#![allow(
++ clippy::disallowed_names,
+ clippy::collapsible_else_if,
+ clippy::equatable_if_let,
+ clippy::collapsible_if,
+ clippy::ifs_same_cond,
+ clippy::needless_return,
+ clippy::single_element_loop,
+ clippy::branches_sharing_code
+)]
+
+fn if_same_then_else2() -> Result<&'static str, ()> {
+ if true {
+ for _ in &[42] {
+ let foo: &Option<_> = &Some::<u8>(42);
+ if foo.is_some() {
+ break;
+ } else {
+ continue;
+ }
+ }
+ } else {
+ //~ ERROR same body as `if` block
+ for _ in &[42] {
+ let bar: &Option<_> = &Some::<u8>(42);
+ if bar.is_some() {
+ break;
+ } else {
+ continue;
+ }
+ }
+ }
+
+ if true {
+ if let Some(a) = Some(42) {}
+ } else {
+ //~ ERROR same body as `if` block
+ if let Some(a) = Some(42) {}
+ }
+
+ if true {
+ if let (1, .., 3) = (1, 2, 3) {}
+ } else {
+ //~ ERROR same body as `if` block
+ if let (1, .., 3) = (1, 2, 3) {}
+ }
+
+ if true {
+ if let (1, .., 3) = (1, 2, 3) {}
+ } else {
+ if let (.., 3) = (1, 2, 3) {}
+ }
+
+ if true {
+ if let (1, .., 3) = (1, 2, 3) {}
+ } else {
+ if let (.., 4) = (1, 2, 3) {}
+ }
+
+ if true {
+ if let (1, .., 3) = (1, 2, 3) {}
+ } else {
+ if let (.., 1, 3) = (1, 2, 3) {}
+ }
+
+ if true {
+ if let Some(42) = None {}
+ } else {
+ if let Option::Some(42) = None {}
+ }
+
+ if true {
+ if let Some(42) = None::<u8> {}
+ } else {
+ if let Some(42) = None {}
+ }
+
+ if true {
+ if let Some(42) = None::<u8> {}
+ } else {
+ if let Some(42) = None::<u32> {}
+ }
+
+ if true {
+ if let Some(a) = Some(42) {}
+ } else {
+ if let Some(a) = Some(43) {}
+ }
+
+ // Same NaNs
+ let _ = if true {
+ f32::NAN
+ } else {
+ //~ ERROR same body as `if` block
+ f32::NAN
+ };
+
+ if true {
+ Ok("foo")?;
+ } else {
+ //~ ERROR same body as `if` block
+ Ok("foo")?;
+ }
+
+ if true {
+ let foo = "";
+ return Ok(&foo[0..]);
+ } else if false {
+ let foo = "bar";
+ return Ok(&foo[0..]);
+ } else {
+ let foo = "";
+ return Ok(&foo[0..]);
+ }
+
+ if true {
+ let foo = "";
+ return Ok(&foo[0..]);
+ } else if false {
+ let foo = "bar";
+ return Ok(&foo[0..]);
+ } else if true {
+ let foo = "";
+ return Ok(&foo[0..]);
+ } else {
+ let foo = "";
+ return Ok(&foo[0..]);
+ }
+
+ // False positive `if_same_then_else`: `let (x, y)` vs. `let (y, x)`; see issue #3559.
+ if true {
+ let foo = "";
+ let (x, y) = (1, 2);
+ return Ok(&foo[x..y]);
+ } else {
+ let foo = "";
+ let (y, x) = (1, 2);
+ return Ok(&foo[x..y]);
+ }
+
+ // Issue #7579
+ let _ = if let Some(0) = None { 0 } else { 0 };
+
+ if true {
+ return Err(());
+ } else if let Some(0) = None {
+ return Err(());
+ }
+
+ let _ = if let Some(0) = None {
+ 0
+ } else if let Some(1) = None {
+ 0
+ } else {
+ 0
+ };
+}
+
+fn main() {}
--- /dev/null
- if v.pop() == None {
+#![warn(clippy::ifs_same_cond)]
+#![allow(clippy::if_same_then_else, clippy::comparison_chain)] // all empty blocks
+
+fn ifs_same_cond() {
+ let a = 0;
+ let b = false;
+
+ if b {
+ } else if b {
+ //~ ERROR ifs same condition
+ }
+
+ if a == 1 {
+ } else if a == 1 {
+ //~ ERROR ifs same condition
+ }
+
+ if 2 * a == 1 {
+ } else if 2 * a == 2 {
+ } else if 2 * a == 1 {
+ //~ ERROR ifs same condition
+ } else if a == 1 {
+ }
+
+ // See #659
+ if cfg!(feature = "feature1-659") {
+ 1
+ } else if cfg!(feature = "feature2-659") {
+ 2
+ } else {
+ 3
+ };
+
+ let mut v = vec![1];
- } else if v.pop() == None {
++ if v.pop().is_none() {
+ // ok, functions
++ } else if v.pop().is_none() {
+ }
+
+ if v.len() == 42 {
+ // ok, functions
+ } else if v.len() == 42 {
+ }
+}
+
+fn main() {}
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+// run-rustfix
+// aux-build:option_helpers.rs
+
+#![warn(clippy::iter_skip_next)]
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::iter_nth)]
+#![allow(unused_mut, dead_code)]
+
+extern crate option_helpers;
+
+use option_helpers::IteratorFalsePositives;
+
+/// Checks implementation of `ITER_SKIP_NEXT` lint
+fn main() {
+ let some_vec = vec![0, 1, 2, 3];
+ let _ = some_vec.iter().nth(42);
+ let _ = some_vec.iter().cycle().nth(42);
+ let _ = (1..10).nth(10);
+ let _ = &some_vec[..].iter().nth(3);
+ let foo = IteratorFalsePositives { foo: 0 };
+ let _ = foo.skip(42).next();
+ let _ = foo.filter().skip(42).next();
+
+ // fix #8128
+ let test_string = "1|1 2";
+ let mut sp = test_string.split('|').map(|s| s.trim());
+ let _: Vec<&str> = sp.nth(1).unwrap().split(' ').collect();
+ if let Some(mut s) = Some(test_string.split('|').map(|s| s.trim())) {
+ let _: Vec<&str> = s.nth(1).unwrap().split(' ').collect();
+ };
+ fn check<T>(mut s: T)
+ where
+ T: Iterator<Item = String>,
+ {
+ let _: Vec<&str> = s.nth(1).unwrap().split(' ').collect();
+ }
+}
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+// run-rustfix
+// aux-build:option_helpers.rs
+
+#![warn(clippy::iter_skip_next)]
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::iter_nth)]
+#![allow(unused_mut, dead_code)]
+
+extern crate option_helpers;
+
+use option_helpers::IteratorFalsePositives;
+
+/// Checks implementation of `ITER_SKIP_NEXT` lint
+fn main() {
+ let some_vec = vec![0, 1, 2, 3];
+ let _ = some_vec.iter().skip(42).next();
+ let _ = some_vec.iter().cycle().skip(42).next();
+ let _ = (1..10).skip(10).next();
+ let _ = &some_vec[..].iter().skip(3).next();
+ let foo = IteratorFalsePositives { foo: 0 };
+ let _ = foo.skip(42).next();
+ let _ = foo.filter().skip(42).next();
+
+ // fix #8128
+ let test_string = "1|1 2";
+ let mut sp = test_string.split('|').map(|s| s.trim());
+ let _: Vec<&str> = sp.skip(1).next().unwrap().split(' ').collect();
+ if let Some(mut s) = Some(test_string.split('|').map(|s| s.trim())) {
+ let _: Vec<&str> = s.skip(1).next().unwrap().split(' ').collect();
+ };
+ fn check<T>(mut s: T)
+ where
+ T: Iterator<Item = String>,
+ {
+ let _: Vec<&str> = s.skip(1).next().unwrap().split(' ').collect();
+ }
+}
--- /dev/null
- clippy::blacklisted_name,
+#![allow(
+ unused_variables,
+ unused_assignments,
+ clippy::similar_names,
++ clippy::disallowed_names,
+ clippy::branches_sharing_code,
+ clippy::needless_late_init
+)]
+#![warn(clippy::useless_let_if_seq)]
+
+fn f() -> bool {
+ true
+}
+fn g(x: i32) -> i32 {
+ x + 1
+}
+
+fn issue985() -> i32 {
+ let mut x = 42;
+ if f() {
+ x = g(x);
+ }
+
+ x
+}
+
+fn issue985_alt() -> i32 {
+ let mut x = 42;
+ if f() {
+ f();
+ } else {
+ x = g(x);
+ }
+
+ x
+}
+
+#[allow(clippy::manual_strip)]
+fn issue975() -> String {
+ let mut udn = "dummy".to_string();
+ if udn.starts_with("uuid:") {
+ udn = String::from(&udn[5..]);
+ }
+ udn
+}
+
+fn early_return() -> u8 {
+ // FIXME: we could extend the lint to include such cases:
+ let foo;
+
+ if f() {
+ return 42;
+ } else {
+ foo = 0;
+ }
+
+ foo
+}
+
+fn main() {
+ early_return();
+ issue975();
+ issue985();
+ issue985_alt();
+
+ let mut foo = 0;
+ if f() {
+ foo = 42;
+ }
+
+ let mut bar = 0;
+ if f() {
+ f();
+ bar = 42;
+ } else {
+ f();
+ }
+
+ let quz;
+ if f() {
+ quz = 42;
+ } else {
+ quz = 0;
+ }
+
+ // `toto` is used several times
+ let mut toto;
+ if f() {
+ toto = 42;
+ } else {
+ for i in &[1, 2] {
+ toto = *i;
+ }
+
+ toto = 2;
+ }
+
+ // found in libcore, the inner if is not a statement but the block's expr
+ let mut ch = b'x';
+ if f() {
+ ch = b'*';
+ if f() {
+ ch = b'?';
+ }
+ }
+
+ // baz needs to be mut
+ let mut baz = 0;
+ if f() {
+ baz = 42;
+ }
+
+ baz = 1337;
+
+ // issue 3043 - types with interior mutability should not trigger this lint
+ use std::cell::Cell;
+ let mut val = Cell::new(1);
+ if true {
+ val = Cell::new(2);
+ }
+ println!("{}", val.get());
+}
--- /dev/null
- && c != None
+// revisions: edition2018 edition2021
+// [edition2018] edition:2018
+// [edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(clippy::nonminimal_bool)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
++ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ assert!(a.is_empty(), "qaqaq{:?}", a);
+ assert!(a.is_empty(), "qwqwq");
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ assert!(!b.is_empty(), "panic1");
+ assert!(!(b.is_empty() && a.is_empty()), "panic2");
+ assert!(!(a.is_empty() && !b.is_empty()), "panic3");
+ assert!(!(b.is_empty() || a.is_empty()), "panic4");
+ assert!(!(a.is_empty() || !b.is_empty()), "panic5");
+ assert!(!a.is_empty(), "with expansion {}", one!());
+}
--- /dev/null
- && c != None
+// revisions: edition2018 edition2021
+// [edition2018] edition:2018
+// [edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(clippy::nonminimal_bool)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
++ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ assert!(a.is_empty(), "qaqaq{:?}", a);
+ assert!(a.is_empty(), "qwqwq");
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ assert!(!b.is_empty(), "panic1");
+ assert!(!(b.is_empty() && a.is_empty()), "panic2");
+ assert!(!(a.is_empty() && !b.is_empty()), "panic3");
+ assert!(!(b.is_empty() || a.is_empty()), "panic4");
+ assert!(!(a.is_empty() || !b.is_empty()), "panic5");
+ assert!(!a.is_empty(), "with expansion {}", one!());
+}
--- /dev/null
- && c != None
+// revisions: edition2018 edition2021
+// [edition2018] edition:2018
+// [edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(clippy::nonminimal_bool)]
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
++ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ assert!(a.is_empty(), "qaqaq{:?}", a);
+ assert!(a.is_empty(), "qwqwq");
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ assert!(!b.is_empty(), "panic1");
+ assert!(!(b.is_empty() && a.is_empty()), "panic2");
+ assert!(!(a.is_empty() && !b.is_empty()), "panic3");
+ assert!(!(b.is_empty() || a.is_empty()), "panic4");
+ assert!(!(a.is_empty() || !b.is_empty()), "panic5");
+}
--- /dev/null
- && c != None
+// revisions: edition2018 edition2021
+// [edition2018] edition:2018
+// [edition2021] edition:2021
+// run-rustfix
+
+#![warn(clippy::manual_assert)]
+#![allow(clippy::nonminimal_bool)]
+
+macro_rules! one {
+ () => {
+ 1
+ };
+}
+
+fn main() {
+ let a = vec![1, 2, 3];
+ let c = Some(2);
+ if !a.is_empty()
+ && a.len() == 3
++ && c.is_some()
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ && !a.is_empty()
+ && a.len() == 3
+ {
+ panic!("qaqaq{:?}", a);
+ }
+ if !a.is_empty() {
+ panic!("qaqaq{:?}", a);
+ }
+ if !a.is_empty() {
+ panic!("qwqwq");
+ }
+ if a.len() == 3 {
+ println!("qwq");
+ println!("qwq");
+ println!("qwq");
+ }
+ if let Some(b) = c {
+ panic!("orz {}", b);
+ }
+ if a.len() == 3 {
+ panic!("qaqaq");
+ } else {
+ println!("qwq");
+ }
+ let b = vec![1, 2, 3];
+ if b.is_empty() {
+ panic!("panic1");
+ }
+ if b.is_empty() && a.is_empty() {
+ panic!("panic2");
+ }
+ if a.is_empty() && !b.is_empty() {
+ panic!("panic3");
+ }
+ if b.is_empty() || a.is_empty() {
+ panic!("panic4");
+ }
+ if a.is_empty() || !b.is_empty() {
+ panic!("panic5");
+ }
+ if a.is_empty() {
+ panic!("with expansion {}", one!())
+ }
+}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::manual_instant_elapsed)]
++#![allow(clippy::unnecessary_operation)]
++#![allow(unused_variables)]
++#![allow(unused_must_use)]
++
++use std::time::Instant;
++
++fn main() {
++ let prev_instant = Instant::now();
++
++ {
++ // don't influence
++ let another_instant = Instant::now();
++ }
++
++ let duration = prev_instant.elapsed();
++
++ // don't catch
++ let duration = prev_instant.elapsed();
++
++ Instant::now() - duration;
++
++ let ref_to_instant = &Instant::now();
++
++ (*ref_to_instant).elapsed(); // to ensure parens are added correctly
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::manual_instant_elapsed)]
++#![allow(clippy::unnecessary_operation)]
++#![allow(unused_variables)]
++#![allow(unused_must_use)]
++
++use std::time::Instant;
++
++fn main() {
++ let prev_instant = Instant::now();
++
++ {
++ // don't influence
++ let another_instant = Instant::now();
++ }
++
++ let duration = Instant::now() - prev_instant;
++
++ // don't catch
++ let duration = prev_instant.elapsed();
++
++ Instant::now() - duration;
++
++ let ref_to_instant = &Instant::now();
++
++ Instant::now() - *ref_to_instant; // to ensure parens are added correctly
++}
--- /dev/null
--- /dev/null
++error: manual implementation of `Instant::elapsed`
++ --> $DIR/manual_instant_elapsed.rs:17:20
++ |
++LL | let duration = Instant::now() - prev_instant;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `prev_instant.elapsed()`
++ |
++ = note: `-D clippy::manual-instant-elapsed` implied by `-D warnings`
++
++error: manual implementation of `Instant::elapsed`
++ --> $DIR/manual_instant_elapsed.rs:26:5
++ |
++LL | Instant::now() - *ref_to_instant; // to ensure parens are added correctly
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `(*ref_to_instant).elapsed()`
++
++error: aborting due to 2 previous errors
++
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+// run-rustfix
+#![warn(clippy::manual_ok_or)]
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::redundant_closure)]
+#![allow(dead_code)]
+#![allow(unused_must_use)]
+
+fn main() {
+ // basic case
+ let foo: Option<i32> = None;
+ foo.ok_or("error");
+
+ // eta expansion case
+ foo.ok_or("error");
+
+ // turbo fish syntax
+ None::<i32>.ok_or("error");
+
+ // multiline case
+ #[rustfmt::skip]
+ foo.ok_or(&format!(
+ "{}{}{}{}{}{}{}",
+ "Alice", "Bob", "Sarah", "Marc", "Sandra", "Eric", "Jenifer"));
+
+ // not applicable, closure isn't direct `Ok` wrapping
+ foo.map_or(Err("error"), |v| Ok(v + 1));
+
+ // not applicable, or side isn't `Result::Err`
+ foo.map_or(Ok::<i32, &str>(1), |v| Ok(v));
+
+ // not applicable, expr is not a `Result` value
+ foo.map_or(42, |v| v);
+
+ // TODO patterns not covered yet
+ match foo {
+ Some(v) => Ok(v),
+ None => Err("error"),
+ };
+ foo.map_or_else(|| Err("error"), |v| Ok(v));
+}
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+// run-rustfix
+#![warn(clippy::manual_ok_or)]
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::redundant_closure)]
+#![allow(dead_code)]
+#![allow(unused_must_use)]
+
+fn main() {
+ // basic case
+ let foo: Option<i32> = None;
+ foo.map_or(Err("error"), |v| Ok(v));
+
+ // eta expansion case
+ foo.map_or(Err("error"), Ok);
+
+ // turbo fish syntax
+ None::<i32>.map_or(Err("error"), |v| Ok(v));
+
+ // multiline case
+ #[rustfmt::skip]
+ foo.map_or(Err::<i32, &str>(
+ &format!(
+ "{}{}{}{}{}{}{}",
+ "Alice", "Bob", "Sarah", "Marc", "Sandra", "Eric", "Jenifer")
+ ),
+ |v| Ok(v),
+ );
+
+ // not applicable, closure isn't direct `Ok` wrapping
+ foo.map_or(Err("error"), |v| Ok(v + 1));
+
+ // not applicable, or side isn't `Result::Err`
+ foo.map_or(Ok::<i32, &str>(1), |v| Ok(v));
+
+ // not applicable, expr is not a `Result` value
+ foo.map_or(42, |v| v);
+
+ // TODO patterns not covered yet
+ match foo {
+ Some(v) => Ok(v),
+ None => Err("error"),
+ };
+ foo.map_or_else(|| Err("error"), |v| Ok(v));
+}
--- /dev/null
- #![allow(clippy::blacklisted_name, clippy::diverging_sub_expression)]
+#![warn(clippy::match_same_arms)]
++#![allow(clippy::disallowed_names, 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
- clippy::blacklisted_name,
+// aux-build:option_helpers.rs
+
+#![warn(clippy::all, clippy::pedantic)]
+#![allow(
++ clippy::disallowed_names,
+ clippy::default_trait_access,
+ clippy::missing_docs_in_private_items,
+ clippy::missing_safety_doc,
+ clippy::non_ascii_literal,
+ clippy::new_without_default,
+ clippy::needless_pass_by_value,
+ clippy::needless_lifetimes,
+ clippy::print_stdout,
+ clippy::must_use_candidate,
+ clippy::use_self,
+ clippy::useless_format,
+ clippy::wrong_self_convention,
+ clippy::unused_async,
+ clippy::unused_self,
+ unused
+)]
+
+#[macro_use]
+extern crate option_helpers;
+
+use std::collections::BTreeMap;
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::collections::VecDeque;
+use std::ops::Mul;
+use std::rc::{self, Rc};
+use std::sync::{self, Arc};
+
+use option_helpers::{IteratorFalsePositives, IteratorMethodFalsePositives};
+
+struct Lt<'a> {
+ foo: &'a u32,
+}
+
+impl<'a> Lt<'a> {
+ // The lifetime is different, but that’s irrelevant; see issue #734.
+ #[allow(clippy::needless_lifetimes)]
+ pub fn new<'b>(s: &'b str) -> Lt<'b> {
+ unimplemented!()
+ }
+}
+
+struct Lt2<'a> {
+ foo: &'a u32,
+}
+
+impl<'a> Lt2<'a> {
+ // The lifetime is different, but that’s irrelevant; see issue #734.
+ pub fn new(s: &str) -> Lt2 {
+ unimplemented!()
+ }
+}
+
+struct Lt3<'a> {
+ foo: &'a u32,
+}
+
+impl<'a> Lt3<'a> {
+ // The lifetime is different, but that’s irrelevant; see issue #734.
+ pub fn new() -> Lt3<'static> {
+ unimplemented!()
+ }
+}
+
+#[derive(Clone, Copy)]
+struct U;
+
+impl U {
+ fn new() -> Self {
+ U
+ }
+ // Ok because `U` is `Copy`.
+ fn to_something(self) -> u32 {
+ 0
+ }
+}
+
+struct V<T> {
+ _dummy: T,
+}
+
+impl<T> V<T> {
+ fn new() -> Option<V<T>> {
+ None
+ }
+}
+
+struct AsyncNew;
+
+impl AsyncNew {
+ async fn new() -> Option<Self> {
+ None
+ }
+}
+
+struct BadNew;
+
+impl BadNew {
+ fn new() -> i32 {
+ 0
+ }
+}
+
+struct T;
+
+impl Mul<T> for T {
+ type Output = T;
+ // No error, obviously.
+ fn mul(self, other: T) -> T {
+ self
+ }
+}
+
+/// Checks implementation of `FILTER_NEXT` lint.
+#[rustfmt::skip]
+fn filter_next() {
+ let v = vec![3, 2, 1, 0, -1, -2, -3];
+
+ // Multi-line case.
+ let _ = v.iter().filter(|&x| {
+ *x < 0
+ }
+ ).next();
+
+ // Check that we don't lint if the caller is not an `Iterator`.
+ let foo = IteratorFalsePositives { foo: 0 };
+ let _ = foo.filter().next();
+
+ let foo = IteratorMethodFalsePositives {};
+ let _ = foo.filter(42).next();
+}
+
+fn main() {
+ filter_next();
+}
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+#![warn(clippy::mismatching_type_param_order)]
++#![allow(clippy::disallowed_names)]
+
+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
+//! False-positive tests to ensure we don't suggest `const` for things where it would cause a
+//! compilation error.
+//! The .stderr output of this test should be empty. Otherwise it's a bug somewhere.
+
+// aux-build:helper.rs
++// aux-build:../../auxiliary/proc_macro_with_span.rs
+
+#![warn(clippy::missing_const_for_fn)]
+#![feature(start)]
+#![feature(custom_inner_attributes)]
+
+extern crate helper;
++extern crate proc_macro_with_span;
++
++use proc_macro_with_span::with_span;
+
+struct Game;
+
+// This should not be linted because it's already const
+const fn already_const() -> i32 {
+ 32
+}
+
+impl Game {
+ // This should not be linted because it's already const
+ pub const fn already_const() -> i32 {
+ 32
+ }
+}
+
+// Allowing on this function, because it would lint, which we don't want in this case.
+#[allow(clippy::missing_const_for_fn)]
+fn random() -> u32 {
+ 42
+}
+
+// We should not suggest to make this function `const` because `random()` is non-const
+fn random_caller() -> u32 {
+ random()
+}
+
+static Y: u32 = 0;
+
+// We should not suggest to make this function `const` because const functions are not allowed to
+// refer to a static variable
+fn get_y() -> u32 {
+ Y
+ //~^ ERROR E0013
+}
+
+// Don't lint entrypoint functions
+#[start]
+fn init(num: isize, something: *const *const u8) -> isize {
+ 1
+}
+
+trait Foo {
+ // This should not be suggested to be made const
+ // (rustc doesn't allow const trait methods)
+ fn f() -> u32;
+
+ // This should not be suggested to be made const either
+ fn g() -> u32 {
+ 33
+ }
+}
+
+// Don't lint in external macros (derive)
+#[derive(PartialEq, Eq)]
+struct Point(isize, isize);
+
+impl std::ops::Add for Point {
+ type Output = Self;
+
+ // Don't lint in trait impls of derived methods
+ fn add(self, other: Self) -> Self {
+ Point(self.0 + other.0, self.1 + other.1)
+ }
+}
+
+mod with_drop {
+ pub struct A;
+ pub struct B;
+ impl Drop for A {
+ fn drop(&mut self) {}
+ }
+
+ impl A {
+ // This can not be const because the type implements `Drop`.
+ pub fn b(self) -> B {
+ B
+ }
+ }
+
+ impl B {
+ // This can not be const because `a` implements `Drop`.
+ pub fn a(self, a: A) -> B {
+ B
+ }
+ }
+}
+
+fn const_generic_params<T, const N: usize>(t: &[T; N]) -> &[T; N] {
+ t
+}
+
+fn const_generic_return<T, const N: usize>(t: &[T]) -> &[T; N] {
+ let p = t.as_ptr() as *const [T; N];
+
+ unsafe { &*p }
+}
+
+// Do not lint this because it calls a function whose constness is unstable.
+fn unstably_const_fn() {
+ helper::unstably_const_fn()
+}
+
+mod const_fn_stabilized_after_msrv {
+ #![clippy::msrv = "1.46.0"]
+
+ // Do not lint this because `u8::is_ascii_digit` is stabilized as a const function in 1.47.0.
+ fn const_fn_stabilized_after_msrv(byte: u8) {
+ byte.is_ascii_digit();
+ }
+}
++
++with_span! {
++ span
++ fn dont_check_in_proc_macro() {}
++}
--- /dev/null
--- /dev/null
++// aux-build: proc_macro_with_span.rs
++
++#![warn(clippy::missing_docs_in_private_items)]
++// When denying at the crate level, be sure to not get random warnings from the
++// injected intrinsics by the compiler.
++#![allow(dead_code)]
++//! Some garbage docs for the crate here
++#![doc = "More garbage"]
++
++extern crate proc_macro_with_span;
++
++use proc_macro_with_span::with_span;
++use std::arch::global_asm;
++
++type Typedef = String;
++pub type PubTypedef = String;
++
++mod module_no_dox {}
++pub mod pub_module_no_dox {}
++
++/// dox
++pub fn foo() {}
++pub fn foo2() {}
++fn foo3() {}
++#[allow(clippy::missing_docs_in_private_items)]
++pub fn foo4() {}
++
++// It sure is nice if doc(hidden) implies allow(missing_docs), and that it
++// applies recursively
++#[doc(hidden)]
++mod a {
++ pub fn baz() {}
++ pub mod b {
++ pub fn baz() {}
++ }
++}
++
++enum Baz {
++ BazA { a: isize, b: isize },
++ BarB,
++}
++
++pub enum PubBaz {
++ PubBazA { a: isize },
++}
++
++/// dox
++pub enum PubBaz2 {
++ /// dox
++ PubBaz2A {
++ /// dox
++ a: isize,
++ },
++}
++
++#[allow(clippy::missing_docs_in_private_items)]
++pub enum PubBaz3 {
++ PubBaz3A { b: isize },
++}
++
++#[doc(hidden)]
++pub fn baz() {}
++
++const FOO: u32 = 0;
++/// dox
++pub const FOO1: u32 = 0;
++#[allow(clippy::missing_docs_in_private_items)]
++pub const FOO2: u32 = 0;
++#[doc(hidden)]
++pub const FOO3: u32 = 0;
++pub const FOO4: u32 = 0;
++
++static BAR: u32 = 0;
++/// dox
++pub static BAR1: u32 = 0;
++#[allow(clippy::missing_docs_in_private_items)]
++pub static BAR2: u32 = 0;
++#[doc(hidden)]
++pub static BAR3: u32 = 0;
++pub static BAR4: u32 = 0;
++
++mod internal_impl {
++ /// dox
++ pub fn documented() {}
++ pub fn undocumented1() {}
++ pub fn undocumented2() {}
++ fn undocumented3() {}
++ /// dox
++ pub mod globbed {
++ /// dox
++ pub fn also_documented() {}
++ pub fn also_undocumented1() {}
++ fn also_undocumented2() {}
++ }
++}
++/// dox
++pub mod public_interface {
++ pub use crate::internal_impl::documented as foo;
++ pub use crate::internal_impl::globbed::*;
++ pub use crate::internal_impl::undocumented1 as bar;
++ pub use crate::internal_impl::{documented, undocumented2};
++}
++
++fn main() {}
++
++// Ensure global asm doesn't require documentation.
++global_asm! { "" }
++
++// Don't lint proc macro output with an unexpected span.
++with_span!(span pub struct FooPm { pub field: u32});
++with_span!(span pub struct FooPm2;);
++with_span!(span pub enum FooPm3 { A, B(u32), C { field: u32 }});
++with_span!(span pub fn foo_pm() {});
++with_span!(span pub static FOO_PM: u32 = 0;);
++with_span!(span pub const FOO2_PM: u32 = 0;);
--- /dev/null
--- /dev/null
++error: missing documentation for a type alias
++ --> $DIR/missing_doc.rs:15:1
++ |
++LL | type Typedef = String;
++ | ^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::missing-docs-in-private-items` implied by `-D warnings`
++
++error: missing documentation for a type alias
++ --> $DIR/missing_doc.rs:16:1
++ |
++LL | pub type PubTypedef = String;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a module
++ --> $DIR/missing_doc.rs:18:1
++ |
++LL | mod module_no_dox {}
++ | ^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a module
++ --> $DIR/missing_doc.rs:19:1
++ |
++LL | pub mod pub_module_no_dox {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:23:1
++ |
++LL | pub fn foo2() {}
++ | ^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:24:1
++ |
++LL | fn foo3() {}
++ | ^^^^^^^^^^^^
++
++error: missing documentation for an enum
++ --> $DIR/missing_doc.rs:38:1
++ |
++LL | / enum Baz {
++LL | | BazA { a: isize, b: isize },
++LL | | BarB,
++LL | | }
++ | |_^
++
++error: missing documentation for a variant
++ --> $DIR/missing_doc.rs:39:5
++ |
++LL | BazA { a: isize, b: isize },
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc.rs:39:12
++ |
++LL | BazA { a: isize, b: isize },
++ | ^^^^^^^^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc.rs:39:22
++ |
++LL | BazA { a: isize, b: isize },
++ | ^^^^^^^^
++
++error: missing documentation for a variant
++ --> $DIR/missing_doc.rs:40:5
++ |
++LL | BarB,
++ | ^^^^
++
++error: missing documentation for an enum
++ --> $DIR/missing_doc.rs:43:1
++ |
++LL | / pub enum PubBaz {
++LL | | PubBazA { a: isize },
++LL | | }
++ | |_^
++
++error: missing documentation for a variant
++ --> $DIR/missing_doc.rs:44:5
++ |
++LL | PubBazA { a: isize },
++ | ^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc.rs:44:15
++ |
++LL | PubBazA { a: isize },
++ | ^^^^^^^^
++
++error: missing documentation for a constant
++ --> $DIR/missing_doc.rs:64:1
++ |
++LL | const FOO: u32 = 0;
++ | ^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a constant
++ --> $DIR/missing_doc.rs:71:1
++ |
++LL | pub const FOO4: u32 = 0;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a static
++ --> $DIR/missing_doc.rs:73:1
++ |
++LL | static BAR: u32 = 0;
++ | ^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a static
++ --> $DIR/missing_doc.rs:80:1
++ |
++LL | pub static BAR4: u32 = 0;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a module
++ --> $DIR/missing_doc.rs:82:1
++ |
++LL | / mod internal_impl {
++LL | | /// dox
++LL | | pub fn documented() {}
++LL | | pub fn undocumented1() {}
++... |
++LL | | }
++LL | | }
++ | |_^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:85:5
++ |
++LL | pub fn undocumented1() {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:86:5
++ |
++LL | pub fn undocumented2() {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:87:5
++ |
++LL | fn undocumented3() {}
++ | ^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:92:9
++ |
++LL | pub fn also_undocumented1() {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for a function
++ --> $DIR/missing_doc.rs:93:9
++ |
++LL | fn also_undocumented2() {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: aborting due to 24 previous errors
++
--- /dev/null
--- /dev/null
++#![warn(clippy::missing_docs_in_private_items)]
++#![doc = include_str!("../../README.md")]
++
++fn main() {}
--- /dev/null
--- /dev/null
++#![warn(clippy::missing_docs_in_private_items)]
++
++fn main() {}
--- /dev/null
--- /dev/null
++error: missing documentation for the crate
++ --> $DIR/missing_doc_crate_missing.rs:1:1
++ |
++LL | / #![warn(clippy::missing_docs_in_private_items)]
++LL | |
++LL | | fn main() {}
++ | |____________^
++ |
++ = note: `-D clippy::missing-docs-in-private-items` implied by `-D warnings`
++
++error: aborting due to previous error
++
--- /dev/null
--- /dev/null
++// aux-build: proc_macro_with_span.rs
++
++#![warn(clippy::missing_docs_in_private_items)]
++#![allow(dead_code)]
++#![feature(associated_type_defaults)]
++
++//! Some garbage docs for the crate here
++#![doc = "More garbage"]
++
++extern crate proc_macro_with_span;
++use proc_macro_with_span::with_span;
++
++struct Foo {
++ a: isize,
++ b: isize,
++}
++
++pub struct PubFoo {
++ pub a: isize,
++ b: isize,
++}
++
++#[allow(clippy::missing_docs_in_private_items)]
++pub struct PubFoo2 {
++ pub a: isize,
++ pub c: isize,
++}
++
++/// dox
++pub trait A {
++ /// dox
++ fn foo(&self);
++ /// dox
++ fn foo_with_impl(&self) {}
++}
++
++#[allow(clippy::missing_docs_in_private_items)]
++trait B {
++ fn foo(&self);
++ fn foo_with_impl(&self) {}
++}
++
++pub trait C {
++ fn foo(&self);
++ fn foo_with_impl(&self) {}
++}
++
++#[allow(clippy::missing_docs_in_private_items)]
++pub trait D {
++ fn dummy(&self) {}
++}
++
++/// dox
++pub trait E: Sized {
++ type AssociatedType;
++ type AssociatedTypeDef = Self;
++
++ /// dox
++ type DocumentedType;
++ /// dox
++ type DocumentedTypeDef = Self;
++ /// dox
++ fn dummy(&self) {}
++}
++
++impl Foo {
++ pub fn new() -> Self {
++ Foo { a: 0, b: 0 }
++ }
++ fn bar() {}
++}
++
++impl PubFoo {
++ pub fn foo() {}
++ /// dox
++ pub fn foo1() {}
++ #[must_use = "yep"]
++ fn foo2() -> u32 {
++ 1
++ }
++ #[allow(clippy::missing_docs_in_private_items)]
++ pub fn foo3() {}
++}
++
++#[allow(clippy::missing_docs_in_private_items)]
++trait F {
++ fn a();
++ fn b(&self);
++}
++
++// should need to redefine documentation for implementations of traits
++impl F for Foo {
++ fn a() {}
++ fn b(&self) {}
++}
++
++fn main() {}
++
++// don't lint proc macro output
++with_span!(span
++ pub struct FooPm;
++ impl FooPm {
++ pub fn foo() {}
++ pub const fn bar() {}
++ pub const X: u32 = 0;
++ }
++);
--- /dev/null
--- /dev/null
++error: missing documentation for a struct
++ --> $DIR/missing_doc_impl.rs:13:1
++ |
++LL | / struct Foo {
++LL | | a: isize,
++LL | | b: isize,
++LL | | }
++ | |_^
++ |
++ = note: `-D clippy::missing-docs-in-private-items` implied by `-D warnings`
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc_impl.rs:14:5
++ |
++LL | a: isize,
++ | ^^^^^^^^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc_impl.rs:15:5
++ |
++LL | b: isize,
++ | ^^^^^^^^
++
++error: missing documentation for a struct
++ --> $DIR/missing_doc_impl.rs:18:1
++ |
++LL | / pub struct PubFoo {
++LL | | pub a: isize,
++LL | | b: isize,
++LL | | }
++ | |_^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc_impl.rs:19:5
++ |
++LL | pub a: isize,
++ | ^^^^^^^^^^^^
++
++error: missing documentation for a struct field
++ --> $DIR/missing_doc_impl.rs:20:5
++ |
++LL | b: isize,
++ | ^^^^^^^^
++
++error: missing documentation for a trait
++ --> $DIR/missing_doc_impl.rs:43:1
++ |
++LL | / pub trait C {
++LL | | fn foo(&self);
++LL | | fn foo_with_impl(&self) {}
++LL | | }
++ | |_^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:44:5
++ |
++LL | fn foo(&self);
++ | ^^^^^^^^^^^^^^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:45:5
++ |
++LL | fn foo_with_impl(&self) {}
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for an associated type
++ --> $DIR/missing_doc_impl.rs:55:5
++ |
++LL | type AssociatedType;
++ | ^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for an associated type
++ --> $DIR/missing_doc_impl.rs:56:5
++ |
++LL | type AssociatedTypeDef = Self;
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:67:5
++ |
++LL | / pub fn new() -> Self {
++LL | | Foo { a: 0, b: 0 }
++LL | | }
++ | |_____^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:70:5
++ |
++LL | fn bar() {}
++ | ^^^^^^^^^^^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:74:5
++ |
++LL | pub fn foo() {}
++ | ^^^^^^^^^^^^^^^
++
++error: missing documentation for an associated function
++ --> $DIR/missing_doc_impl.rs:78:5
++ |
++LL | / fn foo2() -> u32 {
++LL | | 1
++LL | | }
++ | |_____^
++
++error: aborting due to 15 previous errors
++
--- /dev/null
+// run-rustfix
++// aux-build: proc_macro_with_span.rs
+
+#![allow(
+ dead_code,
+ unused_variables,
+ overflowing_literals,
+ clippy::excessive_precision,
+ clippy::inconsistent_digit_grouping,
+ clippy::unusual_byte_groupings
+)]
+
++extern crate proc_macro_with_span;
++use proc_macro_with_span::with_span;
++
+fn main() {
+ let fail14 = 2_i32;
+ let fail15 = 4_i64;
+ let fail16 = 7_i8; //
+ let fail17 = 23_i16; //
+ let ok18 = 23_128;
+
+ let fail20 = 2_i8; //
+ let fail21 = 4_i16; //
+
+ let ok24 = 12.34_64;
+ let fail25 = 1E2_f32;
+ let fail26 = 43E7_f64;
+ let fail27 = 243E17_f32;
+ let fail28 = 241_251_235E723_f64;
+ let ok29 = 42279.911_32;
+
+ // testing that the suggestion actually fits in its type
+ let fail30 = 127_i8; // should be i8
+ let fail31 = 240_u8; // should be u8
+ let ok32 = 360_8; // doesnt fit in either, should be ignored
+ let fail33 = 0x1234_i16;
+ let fail34 = 0xABCD_u16;
+ let ok35 = 0x12345_16;
+ let fail36 = 0xFFFF_FFFF_FFFF_FFFF_u64; // u64
+
+ // issue #6129
+ let ok37 = 123_32.123;
+ let ok38 = 124_64.0;
+
+ let _ = 1.123_45E1_f32;
++
++ let _ = with_span!(1 2_u32);
+}
--- /dev/null
+// run-rustfix
++// aux-build: proc_macro_with_span.rs
+
+#![allow(
+ dead_code,
+ unused_variables,
+ overflowing_literals,
+ clippy::excessive_precision,
+ clippy::inconsistent_digit_grouping,
+ clippy::unusual_byte_groupings
+)]
+
++extern crate proc_macro_with_span;
++use proc_macro_with_span::with_span;
++
+fn main() {
+ let fail14 = 2_32;
+ let fail15 = 4_64;
+ let fail16 = 7_8; //
+ let fail17 = 23_16; //
+ let ok18 = 23_128;
+
+ let fail20 = 2__8; //
+ let fail21 = 4___16; //
+
+ let ok24 = 12.34_64;
+ let fail25 = 1E2_32;
+ let fail26 = 43E7_64;
+ let fail27 = 243E17_32;
+ let fail28 = 241251235E723_64;
+ let ok29 = 42279.911_32;
+
+ // testing that the suggestion actually fits in its type
+ let fail30 = 127_8; // should be i8
+ let fail31 = 240_8; // should be u8
+ let ok32 = 360_8; // doesnt fit in either, should be ignored
+ let fail33 = 0x1234_16;
+ let fail34 = 0xABCD_16;
+ let ok35 = 0x12345_16;
+ let fail36 = 0xFFFF_FFFF_FFFF_FFFF_64; // u64
+
+ // issue #6129
+ let ok37 = 123_32.123;
+ let ok38 = 124_64.0;
+
+ let _ = 1.12345E1_32;
++
++ let _ = with_span!(1 2_u32);
+}
--- /dev/null
- --> $DIR/mistyped_literal_suffix.rs:13:18
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:14:18
++ --> $DIR/mistyped_literal_suffix.rs:17:18
+ |
+LL | let fail14 = 2_32;
+ | ^^^^ help: did you mean to write: `2_i32`
+ |
+ = note: `#[deny(clippy::mistyped_literal_suffixes)]` on by default
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:15:18
++ --> $DIR/mistyped_literal_suffix.rs:18:18
+ |
+LL | let fail15 = 4_64;
+ | ^^^^ help: did you mean to write: `4_i64`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:16:18
++ --> $DIR/mistyped_literal_suffix.rs:19:18
+ |
+LL | let fail16 = 7_8; //
+ | ^^^ help: did you mean to write: `7_i8`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:19:18
++ --> $DIR/mistyped_literal_suffix.rs:20:18
+ |
+LL | let fail17 = 23_16; //
+ | ^^^^^ help: did you mean to write: `23_i16`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:20:18
++ --> $DIR/mistyped_literal_suffix.rs:23:18
+ |
+LL | let fail20 = 2__8; //
+ | ^^^^ help: did you mean to write: `2_i8`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:23:18
++ --> $DIR/mistyped_literal_suffix.rs:24:18
+ |
+LL | let fail21 = 4___16; //
+ | ^^^^^^ help: did you mean to write: `4_i16`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:24:18
++ --> $DIR/mistyped_literal_suffix.rs:27:18
+ |
+LL | let fail25 = 1E2_32;
+ | ^^^^^^ help: did you mean to write: `1E2_f32`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:25:18
++ --> $DIR/mistyped_literal_suffix.rs:28:18
+ |
+LL | let fail26 = 43E7_64;
+ | ^^^^^^^ help: did you mean to write: `43E7_f64`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:26:18
++ --> $DIR/mistyped_literal_suffix.rs:29:18
+ |
+LL | let fail27 = 243E17_32;
+ | ^^^^^^^^^ help: did you mean to write: `243E17_f32`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:30:18
++ --> $DIR/mistyped_literal_suffix.rs:30:18
+ |
+LL | let fail28 = 241251235E723_64;
+ | ^^^^^^^^^^^^^^^^ help: did you mean to write: `241_251_235E723_f64`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:31:18
++ --> $DIR/mistyped_literal_suffix.rs:34:18
+ |
+LL | let fail30 = 127_8; // should be i8
+ | ^^^^^ help: did you mean to write: `127_i8`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:33:18
++ --> $DIR/mistyped_literal_suffix.rs:35:18
+ |
+LL | let fail31 = 240_8; // should be u8
+ | ^^^^^ help: did you mean to write: `240_u8`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:34:18
++ --> $DIR/mistyped_literal_suffix.rs:37:18
+ |
+LL | let fail33 = 0x1234_16;
+ | ^^^^^^^^^ help: did you mean to write: `0x1234_i16`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:36:18
++ --> $DIR/mistyped_literal_suffix.rs:38:18
+ |
+LL | let fail34 = 0xABCD_16;
+ | ^^^^^^^^^ help: did you mean to write: `0xABCD_u16`
+
+error: mistyped literal suffix
- --> $DIR/mistyped_literal_suffix.rs:42:13
++ --> $DIR/mistyped_literal_suffix.rs:40:18
+ |
+LL | let fail36 = 0xFFFF_FFFF_FFFF_FFFF_64; // u64
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: did you mean to write: `0xFFFF_FFFF_FFFF_FFFF_u64`
+
+error: mistyped literal suffix
++ --> $DIR/mistyped_literal_suffix.rs:46:13
+ |
+LL | let _ = 1.12345E1_32;
+ | ^^^^^^^^^^^^ help: did you mean to write: `1.123_45E1_f32`
+
+error: aborting due to 16 previous errors
+
--- /dev/null
- clippy::blacklisted_name
+#[warn(clippy::mixed_read_write_in_expression)]
+#[allow(
+ unused_assignments,
+ unused_variables,
+ clippy::no_effect,
+ dead_code,
++ clippy::disallowed_names
+)]
+fn main() {
+ let mut x = 0;
+ let a = {
+ x = 1;
+ 1
+ } + x;
+
+ // Example from iss#277
+ x += {
+ x = 20;
+ 2
+ };
+
+ // Does it work in weird places?
+ // ...in the base for a struct expression?
+ struct Foo {
+ a: i32,
+ b: i32,
+ };
+ let base = Foo { a: 4, b: 5 };
+ let foo = Foo {
+ a: x,
+ ..{
+ x = 6;
+ base
+ }
+ };
+ // ...inside a closure?
+ let closure = || {
+ let mut x = 0;
+ x += {
+ x = 20;
+ 2
+ };
+ };
+ // ...not across a closure?
+ let mut y = 0;
+ let b = (y, || y = 1);
+
+ // && and || evaluate left-to-right.
+ let a = {
+ x = 1;
+ true
+ } && (x == 3);
+ let a = {
+ x = 1;
+ true
+ } || (x == 3);
+
+ // Make sure we don't get confused by alpha conversion.
+ let a = {
+ let mut x = 1;
+ x = 2;
+ 1
+ } + x;
+
+ // No warning if we don't read the variable...
+ x = {
+ x = 20;
+ 2
+ };
+ // ...if the assignment is in a closure...
+ let b = {
+ || {
+ x = 1;
+ };
+ 1
+ } + x;
+ // ... or the access is under an address.
+ let b = (
+ {
+ let p = &x;
+ 1
+ },
+ {
+ x = 1;
+ x
+ },
+ );
+
+ // Limitation: l-values other than simple variables don't trigger
+ // the warning.
+ let mut tup = (0, 0);
+ let c = {
+ tup.0 = 1;
+ 1
+ } + tup.0;
+ // Limitation: you can get away with a read under address-of.
+ let mut z = 0;
+ let b = (
+ &{
+ z = x;
+ x
+ },
+ {
+ x = 3;
+ x
+ },
+ );
+}
+
+async fn issue_6925() {
+ let _ = vec![async { true }.await, async { false }.await];
+}
--- /dev/null
- #![allow(unused_variables, clippy::blacklisted_name)]
++#![allow(unused_variables, clippy::disallowed_names)]
+#![warn(clippy::op_ref)]
+use std::collections::HashSet;
+use std::ops::{BitAnd, Mul};
+
+fn main() {
+ let tracked_fds: HashSet<i32> = HashSet::new();
+ let new_fds = HashSet::new();
+ let unwanted = &tracked_fds - &new_fds;
+
+ let foo = &5 - &6;
+
+ let bar = String::new();
+ let bar = "foo" == &bar;
+
+ let a = "a".to_string();
+ let b = "a";
+
+ if b < &a {
+ println!("OK");
+ }
+
+ struct X(i32);
+ impl BitAnd for X {
+ type Output = X;
+ fn bitand(self, rhs: X) -> X {
+ X(self.0 & rhs.0)
+ }
+ }
+ impl<'a> BitAnd<&'a X> for X {
+ type Output = X;
+ fn bitand(self, rhs: &'a X) -> X {
+ X(self.0 & rhs.0)
+ }
+ }
+ let x = X(1);
+ let y = X(2);
+ let z = x & &y;
+
+ #[derive(Copy, Clone)]
+ struct Y(i32);
+ impl BitAnd for Y {
+ type Output = Y;
+ fn bitand(self, rhs: Y) -> Y {
+ Y(self.0 & rhs.0)
+ }
+ }
+ impl<'a> BitAnd<&'a Y> for Y {
+ type Output = Y;
+ fn bitand(self, rhs: &'a Y) -> Y {
+ Y(self.0 & rhs.0)
+ }
+ }
+ let x = Y(1);
+ let y = Y(2);
+ let z = x & &y;
+}
+
+#[derive(Clone, Copy)]
+struct A(i32);
+#[derive(Clone, Copy)]
+struct B(i32);
+
+impl Mul<&A> for B {
+ type Output = i32;
+ fn mul(self, rhs: &A) -> Self::Output {
+ self.0 * rhs.0
+ }
+}
+impl Mul<A> for B {
+ type Output = i32;
+ fn mul(self, rhs: A) -> Self::Output {
+ // Should not lint because removing the reference would lead to unconditional recursion
+ self * &rhs
+ }
+}
+impl Mul<&A> for A {
+ type Output = i32;
+ fn mul(self, rhs: &A) -> Self::Output {
+ self.0 * rhs.0
+ }
+}
+impl Mul<A> for A {
+ type Output = i32;
+ fn mul(self, rhs: A) -> Self::Output {
+ let one = B(1);
+ let two = 2;
+ let three = 3;
+ let _ = one * &self;
+ let _ = two + &three;
+ // Removing the reference would lead to unconditional recursion
+ self * &rhs
+ }
+}
--- /dev/null
--- /dev/null
++#![feature(lint_reasons)]
++#![allow(unused, clippy::diverging_sub_expression)]
++#![warn(clippy::overly_complex_bool_expr)]
++
++fn main() {
++ let a: bool = unimplemented!();
++ let b: bool = unimplemented!();
++ let c: bool = unimplemented!();
++ let d: bool = unimplemented!();
++ let e: bool = unimplemented!();
++ let _ = a && b || a;
++ let _ = !(a && b);
++ let _ = false && a;
++ // don't lint on cfgs
++ let _ = cfg!(you_shall_not_not_pass) && a;
++ let _ = a || !b || !c || !d || !e;
++ let _ = !(a && b || c);
++}
++
++fn equality_stuff() {
++ let a: i32 = unimplemented!();
++ let b: i32 = unimplemented!();
++ let _ = a == b && a != b;
++ let _ = a < b && a >= b;
++ let _ = a > b && a <= b;
++ let _ = a > b && a == b;
++}
++
++fn check_expect() {
++ let a: i32 = unimplemented!();
++ let b: i32 = unimplemented!();
++ #[expect(clippy::overly_complex_bool_expr)]
++ let _ = a < b && a >= b;
++}
--- /dev/null
--- /dev/null
++error: this boolean expression contains a logic bug
++ --> $DIR/overly_complex_bool_expr.rs:11:13
++ |
++LL | let _ = a && b || a;
++ | ^^^^^^^^^^^ help: it would look like the following: `a`
++ |
++ = note: `-D clippy::overly-complex-bool-expr` implied by `-D warnings`
++help: this expression can be optimized out by applying boolean operations to the outer expression
++ --> $DIR/overly_complex_bool_expr.rs:11:18
++ |
++LL | let _ = a && b || a;
++ | ^
++
++error: this boolean expression contains a logic bug
++ --> $DIR/overly_complex_bool_expr.rs:13:13
++ |
++LL | let _ = false && a;
++ | ^^^^^^^^^^ help: it would look like the following: `false`
++ |
++help: this expression can be optimized out by applying boolean operations to the outer expression
++ --> $DIR/overly_complex_bool_expr.rs:13:22
++ |
++LL | let _ = false && a;
++ | ^
++
++error: this boolean expression contains a logic bug
++ --> $DIR/overly_complex_bool_expr.rs:23:13
++ |
++LL | let _ = a == b && a != b;
++ | ^^^^^^^^^^^^^^^^ help: it would look like the following: `false`
++ |
++help: this expression can be optimized out by applying boolean operations to the outer expression
++ --> $DIR/overly_complex_bool_expr.rs:23:13
++ |
++LL | let _ = a == b && a != b;
++ | ^^^^^^
++
++error: this boolean expression contains a logic bug
++ --> $DIR/overly_complex_bool_expr.rs:24:13
++ |
++LL | let _ = a < b && a >= b;
++ | ^^^^^^^^^^^^^^^ help: it would look like the following: `false`
++ |
++help: this expression can be optimized out by applying boolean operations to the outer expression
++ --> $DIR/overly_complex_bool_expr.rs:24:13
++ |
++LL | let _ = a < b && a >= b;
++ | ^^^^^
++
++error: this boolean expression contains a logic bug
++ --> $DIR/overly_complex_bool_expr.rs:25:13
++ |
++LL | let _ = a > b && a <= b;
++ | ^^^^^^^^^^^^^^^ help: it would look like the following: `false`
++ |
++help: this expression can be optimized out by applying boolean operations to the outer expression
++ --> $DIR/overly_complex_bool_expr.rs:25:13
++ |
++LL | let _ = a > b && a <= b;
++ | ^^^^^
++
++error: aborting due to 5 previous errors
++
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::partialeq_to_none)]
++
++struct Foobar;
++
++impl PartialEq<Option<()>> for Foobar {
++ fn eq(&self, _: &Option<()>) -> bool {
++ false
++ }
++}
++
++#[allow(dead_code)]
++fn foo(f: Option<u32>) -> &'static str {
++ if f.is_some() { "yay" } else { "nay" }
++}
++
++fn foobar() -> Option<()> {
++ None
++}
++
++fn bar() -> Result<(), ()> {
++ Ok(())
++}
++
++fn optref() -> &'static &'static Option<()> {
++ &&None
++}
++
++fn main() {
++ let x = Some(0);
++
++ let _ = x.is_none();
++ let _ = x.is_some();
++ let _ = x.is_none();
++ let _ = x.is_some();
++
++ if foobar().is_none() {}
++
++ if bar().ok().is_some() {}
++
++ let _ = Some(1 + 2).is_some();
++
++ let _ = { Some(0) }.is_none();
++
++ let _ = {
++ /*
++ This comment runs long
++ */
++ Some(1)
++ }.is_some();
++
++ // Should not trigger, as `Foobar` is not an `Option` and has no `is_none`
++ let _ = Foobar == None;
++
++ let _ = optref().is_none();
++ let _ = optref().is_some();
++ let _ = optref().is_none();
++ let _ = optref().is_some();
++
++ let x = Box::new(Option::<()>::None);
++ let _ = (*x).is_some();
++}
--- /dev/null
--- /dev/null
++// run-rustfix
++#![warn(clippy::partialeq_to_none)]
++
++struct Foobar;
++
++impl PartialEq<Option<()>> for Foobar {
++ fn eq(&self, _: &Option<()>) -> bool {
++ false
++ }
++}
++
++#[allow(dead_code)]
++fn foo(f: Option<u32>) -> &'static str {
++ if f != None { "yay" } else { "nay" }
++}
++
++fn foobar() -> Option<()> {
++ None
++}
++
++fn bar() -> Result<(), ()> {
++ Ok(())
++}
++
++fn optref() -> &'static &'static Option<()> {
++ &&None
++}
++
++fn main() {
++ let x = Some(0);
++
++ let _ = x == None;
++ let _ = x != None;
++ let _ = None == x;
++ let _ = None != x;
++
++ if foobar() == None {}
++
++ if bar().ok() != None {}
++
++ let _ = Some(1 + 2) != None;
++
++ let _ = { Some(0) } == None;
++
++ let _ = {
++ /*
++ This comment runs long
++ */
++ Some(1)
++ } != None;
++
++ // Should not trigger, as `Foobar` is not an `Option` and has no `is_none`
++ let _ = Foobar == None;
++
++ let _ = optref() == &&None;
++ let _ = &&None != optref();
++ let _ = **optref() == None;
++ let _ = &None != *optref();
++
++ let x = Box::new(Option::<()>::None);
++ let _ = None != *x;
++}
--- /dev/null
--- /dev/null
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:14:8
++ |
++LL | if f != None { "yay" } else { "nay" }
++ | ^^^^^^^^^ help: use `Option::is_some()` instead: `f.is_some()`
++ |
++ = note: `-D clippy::partialeq-to-none` implied by `-D warnings`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:32:13
++ |
++LL | let _ = x == None;
++ | ^^^^^^^^^ help: use `Option::is_none()` instead: `x.is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:33:13
++ |
++LL | let _ = x != None;
++ | ^^^^^^^^^ help: use `Option::is_some()` instead: `x.is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:34:13
++ |
++LL | let _ = None == x;
++ | ^^^^^^^^^ help: use `Option::is_none()` instead: `x.is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:35:13
++ |
++LL | let _ = None != x;
++ | ^^^^^^^^^ help: use `Option::is_some()` instead: `x.is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:37:8
++ |
++LL | if foobar() == None {}
++ | ^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `foobar().is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:39:8
++ |
++LL | if bar().ok() != None {}
++ | ^^^^^^^^^^^^^^^^^^ help: use `Option::is_some()` instead: `bar().ok().is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:41:13
++ |
++LL | let _ = Some(1 + 2) != None;
++ | ^^^^^^^^^^^^^^^^^^^ help: use `Option::is_some()` instead: `Some(1 + 2).is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:43:13
++ |
++LL | let _ = { Some(0) } == None;
++ | ^^^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `{ Some(0) }.is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:45:13
++ |
++LL | let _ = {
++ | _____________^
++LL | | /*
++LL | | This comment runs long
++LL | | */
++LL | | Some(1)
++LL | | } != None;
++ | |_____________^
++ |
++help: use `Option::is_some()` instead
++ |
++LL ~ let _ = {
++LL + /*
++LL + This comment runs long
++LL + */
++LL + Some(1)
++LL ~ }.is_some();
++ |
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:55:13
++ |
++LL | let _ = optref() == &&None;
++ | ^^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `optref().is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:56:13
++ |
++LL | let _ = &&None != optref();
++ | ^^^^^^^^^^^^^^^^^^ help: use `Option::is_some()` instead: `optref().is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:57:13
++ |
++LL | let _ = **optref() == None;
++ | ^^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `optref().is_none()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:58:13
++ |
++LL | let _ = &None != *optref();
++ | ^^^^^^^^^^^^^^^^^^ help: use `Option::is_some()` instead: `optref().is_some()`
++
++error: binary comparison to literal `Option::None`
++ --> $DIR/partialeq_to_none.rs:61:13
++ |
++LL | let _ = None != *x;
++ | ^^^^^^^^^^ help: use `Option::is_some()` instead: `(*x).is_some()`
++
++error: aborting due to 15 previous errors
++
--- /dev/null
- #![allow(unused, clippy::blacklisted_name)]
+#![warn(clippy::rc_mutex)]
++#![allow(unused, clippy::disallowed_names)]
+
+use std::rc::Rc;
+use std::sync::Mutex;
+
+pub struct MyStructWithPrivItem {
+ foo: Rc<Mutex<i32>>,
+}
+
+pub struct MyStructWithPubItem {
+ pub foo: Rc<Mutex<i32>>,
+}
+
+pub struct SubT<T> {
+ foo: T,
+}
+
+pub enum MyEnum {
+ One,
+ Two,
+}
+
+// All of these test should be trigger the lint because they are not
+// part of the public api
+fn test1<T>(foo: Rc<Mutex<T>>) {}
+fn test2(foo: Rc<Mutex<MyEnum>>) {}
+fn test3(foo: Rc<Mutex<SubT<usize>>>) {}
+
+// All of these test should be allowed because they are part of the
+// public api and `avoid_breaking_exported_api` is `false` by default.
+pub fn pub_test1<T>(foo: Rc<Mutex<T>>) {}
+pub fn pub_test2(foo: Rc<Mutex<MyEnum>>) {}
+pub fn pub_test3(foo: Rc<Mutex<SubT<usize>>>) {}
+
+fn main() {}
--- /dev/null
- #![allow(clippy::boxed_local, clippy::needless_pass_by_value)]
- #![allow(clippy::blacklisted_name, unused_variables, dead_code)]
- #![allow(unused_imports)]
+#![warn(clippy::all)]
- pub enum MyEnum {
- One,
- Two,
- }
-
++#![allow(clippy::boxed_local, clippy::disallowed_names)]
+
+pub struct MyStruct;
+
+pub struct SubT<T> {
+ foo: T,
+}
+
- use crate::MyEnum;
+mod outer_box {
- use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn box_test6<T>(foo: Box<Rc<T>>) {}
+
+ pub fn box_test7<T>(foo: Box<Arc<T>>) {}
+
+ pub fn box_test8() -> Box<Rc<SubT<usize>>> {
+ unimplemented!();
+ }
+
+ pub fn box_test9<T>(foo: Box<Arc<T>>) -> Box<Arc<SubT<T>>> {
+ unimplemented!();
+ }
+}
+
+mod outer_rc {
- use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn rc_test5(a: Rc<Box<bool>>) {}
+
+ pub fn rc_test7(a: Rc<Arc<bool>>) {}
+
+ pub fn rc_test8() -> Rc<Box<SubT<usize>>> {
+ unimplemented!();
+ }
+
+ pub fn rc_test9<T>(foo: Rc<Arc<T>>) -> Rc<Arc<SubT<T>>> {
+ unimplemented!();
+ }
+}
+
+mod outer_arc {
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn arc_test5(a: Arc<Box<bool>>) {}
+
+ pub fn arc_test6(a: Arc<Rc<bool>>) {}
+
+ pub fn arc_test8() -> Arc<Box<SubT<usize>>> {
+ unimplemented!();
+ }
+
+ pub fn arc_test9<T>(foo: Arc<Rc<T>>) -> Arc<Rc<SubT<T>>> {
+ unimplemented!();
+ }
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/7487
+mod box_dyn {
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub trait T {}
+
+ struct S {
+ a: Box<Box<dyn T>>,
+ b: Rc<Box<dyn T>>,
+ c: Arc<Box<dyn T>>,
+ }
+
+ pub fn test_box(_: Box<Box<dyn T>>) {}
+ pub fn test_rc(_: Rc<Box<dyn T>>) {}
+ pub fn test_arc(_: Arc<Box<dyn T>>) {}
+ pub fn test_rc_box(_: Rc<Box<Box<dyn T>>>) {}
+}
+
+// https://github.com/rust-lang/rust-clippy/issues/8604
+mod box_fat_ptr {
+ use std::boxed::Box;
+ use std::path::Path;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub struct DynSized {
+ foo: [usize],
+ }
+
+ struct S {
+ a: Box<Box<str>>,
+ b: Rc<Box<str>>,
+ c: Arc<Box<str>>,
+
+ e: Box<Box<[usize]>>,
+ f: Box<Box<Path>>,
+ g: Box<Box<DynSized>>,
+ }
+
+ pub fn test_box_str(_: Box<Box<str>>) {}
+ pub fn test_rc_str(_: Rc<Box<str>>) {}
+ pub fn test_arc_str(_: Arc<Box<str>>) {}
+
+ pub fn test_box_slice(_: Box<Box<[usize]>>) {}
+ pub fn test_box_path(_: Box<Box<Path>>) {}
+ pub fn test_box_custom(_: Box<Box<DynSized>>) {}
+
+ pub fn test_rc_box_str(_: Rc<Box<Box<str>>>) {}
+ pub fn test_rc_box_slice(_: Rc<Box<Box<[usize]>>>) {}
+ pub fn test_rc_box_path(_: Rc<Box<Box<Path>>>) {}
+ pub fn test_rc_box_custom(_: Rc<Box<Box<DynSized>>>) {}
+}
+
+fn main() {}
--- /dev/null
- --> $DIR/redundant_allocation.rs:25:30
+error: usage of `Box<Rc<T>>`
- --> $DIR/redundant_allocation.rs:27:30
++ --> $DIR/redundant_allocation.rs:17:30
+ |
+LL | pub fn box_test6<T>(foo: Box<Rc<T>>) {}
+ | ^^^^^^^^^^
+ |
+ = note: `-D clippy::redundant-allocation` implied by `-D warnings`
+ = note: `Rc<T>` is already on the heap, `Box<Rc<T>>` makes an extra allocation
+ = help: consider using just `Box<T>` or `Rc<T>`
+
+error: usage of `Box<Arc<T>>`
- --> $DIR/redundant_allocation.rs:29:27
++ --> $DIR/redundant_allocation.rs:19:30
+ |
+LL | pub fn box_test7<T>(foo: Box<Arc<T>>) {}
+ | ^^^^^^^^^^^
+ |
+ = note: `Arc<T>` is already on the heap, `Box<Arc<T>>` makes an extra allocation
+ = help: consider using just `Box<T>` or `Arc<T>`
+
+error: usage of `Box<Rc<SubT<usize>>>`
- --> $DIR/redundant_allocation.rs:33:30
++ --> $DIR/redundant_allocation.rs:21:27
+ |
+LL | pub fn box_test8() -> Box<Rc<SubT<usize>>> {
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Rc<SubT<usize>>` is already on the heap, `Box<Rc<SubT<usize>>>` makes an extra allocation
+ = help: consider using just `Box<SubT<usize>>` or `Rc<SubT<usize>>`
+
+error: usage of `Box<Arc<T>>`
- --> $DIR/redundant_allocation.rs:33:46
++ --> $DIR/redundant_allocation.rs:25:30
+ |
+LL | pub fn box_test9<T>(foo: Box<Arc<T>>) -> Box<Arc<SubT<T>>> {
+ | ^^^^^^^^^^^
+ |
+ = note: `Arc<T>` is already on the heap, `Box<Arc<T>>` makes an extra allocation
+ = help: consider using just `Box<T>` or `Arc<T>`
+
+error: usage of `Box<Arc<SubT<T>>>`
- --> $DIR/redundant_allocation.rs:46:24
++ --> $DIR/redundant_allocation.rs:25:46
+ |
+LL | pub fn box_test9<T>(foo: Box<Arc<T>>) -> Box<Arc<SubT<T>>> {
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = note: `Arc<SubT<T>>` is already on the heap, `Box<Arc<SubT<T>>>` makes an extra allocation
+ = help: consider using just `Box<SubT<T>>` or `Arc<SubT<T>>`
+
+error: usage of `Rc<Box<bool>>`
- --> $DIR/redundant_allocation.rs:48:24
++ --> $DIR/redundant_allocation.rs:37:24
+ |
+LL | pub fn rc_test5(a: Rc<Box<bool>>) {}
+ | ^^^^^^^^^^^^^
+ |
+ = note: `Box<bool>` is already on the heap, `Rc<Box<bool>>` makes an extra allocation
+ = help: consider using just `Rc<bool>` or `Box<bool>`
+
+error: usage of `Rc<Arc<bool>>`
- --> $DIR/redundant_allocation.rs:50:26
++ --> $DIR/redundant_allocation.rs:39:24
+ |
+LL | pub fn rc_test7(a: Rc<Arc<bool>>) {}
+ | ^^^^^^^^^^^^^
+ |
+ = note: `Arc<bool>` is already on the heap, `Rc<Arc<bool>>` makes an extra allocation
+ = help: consider using just `Rc<bool>` or `Arc<bool>`
+
+error: usage of `Rc<Box<SubT<usize>>>`
- --> $DIR/redundant_allocation.rs:54:29
++ --> $DIR/redundant_allocation.rs:41:26
+ |
+LL | pub fn rc_test8() -> Rc<Box<SubT<usize>>> {
+ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<SubT<usize>>` is already on the heap, `Rc<Box<SubT<usize>>>` makes an extra allocation
+ = help: consider using just `Rc<SubT<usize>>` or `Box<SubT<usize>>`
+
+error: usage of `Rc<Arc<T>>`
- --> $DIR/redundant_allocation.rs:54:44
++ --> $DIR/redundant_allocation.rs:45:29
+ |
+LL | pub fn rc_test9<T>(foo: Rc<Arc<T>>) -> Rc<Arc<SubT<T>>> {
+ | ^^^^^^^^^^
+ |
+ = note: `Arc<T>` is already on the heap, `Rc<Arc<T>>` makes an extra allocation
+ = help: consider using just `Rc<T>` or `Arc<T>`
+
+error: usage of `Rc<Arc<SubT<T>>>`
- --> $DIR/redundant_allocation.rs:67:25
++ --> $DIR/redundant_allocation.rs:45:44
+ |
+LL | pub fn rc_test9<T>(foo: Rc<Arc<T>>) -> Rc<Arc<SubT<T>>> {
+ | ^^^^^^^^^^^^^^^^
+ |
+ = note: `Arc<SubT<T>>` is already on the heap, `Rc<Arc<SubT<T>>>` makes an extra allocation
+ = help: consider using just `Rc<SubT<T>>` or `Arc<SubT<T>>`
+
+error: usage of `Arc<Box<bool>>`
- --> $DIR/redundant_allocation.rs:69:25
++ --> $DIR/redundant_allocation.rs:57:25
+ |
+LL | pub fn arc_test5(a: Arc<Box<bool>>) {}
+ | ^^^^^^^^^^^^^^
+ |
+ = note: `Box<bool>` is already on the heap, `Arc<Box<bool>>` makes an extra allocation
+ = help: consider using just `Arc<bool>` or `Box<bool>`
+
+error: usage of `Arc<Rc<bool>>`
- --> $DIR/redundant_allocation.rs:71:27
++ --> $DIR/redundant_allocation.rs:59:25
+ |
+LL | pub fn arc_test6(a: Arc<Rc<bool>>) {}
+ | ^^^^^^^^^^^^^
+ |
+ = note: `Rc<bool>` is already on the heap, `Arc<Rc<bool>>` makes an extra allocation
+ = help: consider using just `Arc<bool>` or `Rc<bool>`
+
+error: usage of `Arc<Box<SubT<usize>>>`
- --> $DIR/redundant_allocation.rs:75:30
++ --> $DIR/redundant_allocation.rs:61:27
+ |
+LL | pub fn arc_test8() -> Arc<Box<SubT<usize>>> {
+ | ^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<SubT<usize>>` is already on the heap, `Arc<Box<SubT<usize>>>` makes an extra allocation
+ = help: consider using just `Arc<SubT<usize>>` or `Box<SubT<usize>>`
+
+error: usage of `Arc<Rc<T>>`
- --> $DIR/redundant_allocation.rs:75:45
++ --> $DIR/redundant_allocation.rs:65:30
+ |
+LL | pub fn arc_test9<T>(foo: Arc<Rc<T>>) -> Arc<Rc<SubT<T>>> {
+ | ^^^^^^^^^^
+ |
+ = note: `Rc<T>` is already on the heap, `Arc<Rc<T>>` makes an extra allocation
+ = help: consider using just `Arc<T>` or `Rc<T>`
+
+error: usage of `Arc<Rc<SubT<T>>>`
- --> $DIR/redundant_allocation.rs:97:27
++ --> $DIR/redundant_allocation.rs:65:45
+ |
+LL | pub fn arc_test9<T>(foo: Arc<Rc<T>>) -> Arc<Rc<SubT<T>>> {
+ | ^^^^^^^^^^^^^^^^
+ |
+ = note: `Rc<SubT<T>>` is already on the heap, `Arc<Rc<SubT<T>>>` makes an extra allocation
+ = help: consider using just `Arc<SubT<T>>` or `Rc<SubT<T>>`
+
+error: usage of `Rc<Box<Box<dyn T>>>`
- --> $DIR/redundant_allocation.rs:129:31
++ --> $DIR/redundant_allocation.rs:87:27
+ |
+LL | pub fn test_rc_box(_: Rc<Box<Box<dyn T>>>) {}
+ | ^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<Box<dyn T>>` is already on the heap, `Rc<Box<Box<dyn T>>>` makes an extra allocation
+ = help: consider using just `Rc<Box<dyn T>>` or `Box<Box<dyn T>>`
+
+error: usage of `Rc<Box<Box<str>>>`
- --> $DIR/redundant_allocation.rs:130:33
++ --> $DIR/redundant_allocation.rs:119:31
+ |
+LL | pub fn test_rc_box_str(_: Rc<Box<Box<str>>>) {}
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<Box<str>>` is already on the heap, `Rc<Box<Box<str>>>` makes an extra allocation
+ = help: consider using just `Rc<Box<str>>` or `Box<Box<str>>`
+
+error: usage of `Rc<Box<Box<[usize]>>>`
- --> $DIR/redundant_allocation.rs:131:32
++ --> $DIR/redundant_allocation.rs:120:33
+ |
+LL | pub fn test_rc_box_slice(_: Rc<Box<Box<[usize]>>>) {}
+ | ^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<Box<[usize]>>` is already on the heap, `Rc<Box<Box<[usize]>>>` makes an extra allocation
+ = help: consider using just `Rc<Box<[usize]>>` or `Box<Box<[usize]>>`
+
+error: usage of `Rc<Box<Box<Path>>>`
- --> $DIR/redundant_allocation.rs:132:34
++ --> $DIR/redundant_allocation.rs:121:32
+ |
+LL | pub fn test_rc_box_path(_: Rc<Box<Box<Path>>>) {}
+ | ^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<Box<Path>>` is already on the heap, `Rc<Box<Box<Path>>>` makes an extra allocation
+ = help: consider using just `Rc<Box<Path>>` or `Box<Box<Path>>`
+
+error: usage of `Rc<Box<Box<DynSized>>>`
++ --> $DIR/redundant_allocation.rs:122:34
+ |
+LL | pub fn test_rc_box_custom(_: Rc<Box<Box<DynSized>>>) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `Box<Box<DynSized>>` is already on the heap, `Rc<Box<Box<DynSized>>>` makes an extra allocation
+ = help: consider using just `Rc<Box<DynSized>>` or `Box<Box<DynSized>>`
+
+error: aborting due to 20 previous errors
+
--- /dev/null
- #![allow(clippy::blacklisted_name, unused_variables, dead_code)]
+// run-rustfix
+#![warn(clippy::all)]
+#![allow(clippy::boxed_local, clippy::needless_pass_by_value)]
++#![allow(clippy::disallowed_names, unused_variables, dead_code)]
+#![allow(unused_imports)]
+
+pub struct MyStruct;
+
+pub struct SubT<T> {
+ foo: T,
+}
+
+pub enum MyEnum {
+ One,
+ Two,
+}
+
+mod outer_box {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn box_test1<T>(foo: &T) {}
+
+ pub fn box_test2(foo: &MyStruct) {}
+
+ pub fn box_test3(foo: &MyEnum) {}
+
+ pub fn box_test4_neg(foo: Box<SubT<&usize>>) {}
+
+ pub fn box_test5<T>(foo: Box<T>) {}
+}
+
+mod outer_rc {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn rc_test1<T>(foo: &T) {}
+
+ pub fn rc_test2(foo: &MyStruct) {}
+
+ pub fn rc_test3(foo: &MyEnum) {}
+
+ pub fn rc_test4_neg(foo: Rc<SubT<&usize>>) {}
+
+ pub fn rc_test6(a: Rc<bool>) {}
+}
+
+mod outer_arc {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn arc_test1<T>(foo: &T) {}
+
+ pub fn arc_test2(foo: &MyStruct) {}
+
+ pub fn arc_test3(foo: &MyEnum) {}
+
+ pub fn arc_test4_neg(foo: Arc<SubT<&usize>>) {}
+
+ pub fn arc_test7(a: Arc<bool>) {}
+}
+
+fn main() {}
--- /dev/null
- #![allow(clippy::blacklisted_name, unused_variables, dead_code)]
+// run-rustfix
+#![warn(clippy::all)]
+#![allow(clippy::boxed_local, clippy::needless_pass_by_value)]
++#![allow(clippy::disallowed_names, unused_variables, dead_code)]
+#![allow(unused_imports)]
+
+pub struct MyStruct;
+
+pub struct SubT<T> {
+ foo: T,
+}
+
+pub enum MyEnum {
+ One,
+ Two,
+}
+
+mod outer_box {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn box_test1<T>(foo: Box<&T>) {}
+
+ pub fn box_test2(foo: Box<&MyStruct>) {}
+
+ pub fn box_test3(foo: Box<&MyEnum>) {}
+
+ pub fn box_test4_neg(foo: Box<SubT<&usize>>) {}
+
+ pub fn box_test5<T>(foo: Box<Box<T>>) {}
+}
+
+mod outer_rc {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn rc_test1<T>(foo: Rc<&T>) {}
+
+ pub fn rc_test2(foo: Rc<&MyStruct>) {}
+
+ pub fn rc_test3(foo: Rc<&MyEnum>) {}
+
+ pub fn rc_test4_neg(foo: Rc<SubT<&usize>>) {}
+
+ pub fn rc_test6(a: Rc<Rc<bool>>) {}
+}
+
+mod outer_arc {
+ use crate::MyEnum;
+ use crate::MyStruct;
+ use crate::SubT;
+ use std::boxed::Box;
+ use std::rc::Rc;
+ use std::sync::Arc;
+
+ pub fn arc_test1<T>(foo: Arc<&T>) {}
+
+ pub fn arc_test2(foo: Arc<&MyStruct>) {}
+
+ pub fn arc_test3(foo: Arc<&MyEnum>) {}
+
+ pub fn arc_test4_neg(foo: Arc<SubT<&usize>>) {}
+
+ pub fn arc_test7(a: Arc<Arc<bool>>) {}
+}
+
+fn main() {}
--- /dev/null
+// run-rustfix
+
++#![feature(async_closure)]
+#![warn(clippy::redundant_closure_call)]
+#![allow(unused)]
+
++async fn something() -> u32 {
++ 21
++}
++
++async fn something_else() -> u32 {
++ 2
++}
++
+fn main() {
+ let a = 42;
++ let b = async {
++ let x = something().await;
++ let y = something_else().await;
++ x * y
++ };
++ let c = {
++ let x = 21;
++ let y = 2;
++ x * y
++ };
++ let d = async { something().await };
+}
--- /dev/null
+// run-rustfix
+
++#![feature(async_closure)]
+#![warn(clippy::redundant_closure_call)]
+#![allow(unused)]
+
++async fn something() -> u32 {
++ 21
++}
++
++async fn something_else() -> u32 {
++ 2
++}
++
+fn main() {
+ let a = (|| 42)();
++ let b = (async || {
++ let x = something().await;
++ let y = something_else().await;
++ x * y
++ })();
++ let c = (|| {
++ let x = 21;
++ let y = 2;
++ x * y
++ })();
++ let d = (async || something().await)();
+}
--- /dev/null
- --> $DIR/redundant_closure_call_fixable.rs:7:13
+error: try not to call a closure in the expression where it is declared
- error: aborting due to previous error
++ --> $DIR/redundant_closure_call_fixable.rs:16:13
+ |
+LL | let a = (|| 42)();
+ | ^^^^^^^^^ help: try doing something like: `42`
+ |
+ = note: `-D clippy::redundant-closure-call` implied by `-D warnings`
+
++error: try not to call a closure in the expression where it is declared
++ --> $DIR/redundant_closure_call_fixable.rs:17:13
++ |
++LL | let b = (async || {
++ | _____________^
++LL | | let x = something().await;
++LL | | let y = something_else().await;
++LL | | x * y
++LL | | })();
++ | |________^
++ |
++help: try doing something like
++ |
++LL ~ let b = async {
++LL + let x = something().await;
++LL + let y = something_else().await;
++LL + x * y
++LL ~ };
++ |
++
++error: try not to call a closure in the expression where it is declared
++ --> $DIR/redundant_closure_call_fixable.rs:22:13
++ |
++LL | let c = (|| {
++ | _____________^
++LL | | let x = 21;
++LL | | let y = 2;
++LL | | x * y
++LL | | })();
++ | |________^
++ |
++help: try doing something like
++ |
++LL ~ let c = {
++LL + let x = 21;
++LL + let y = 2;
++LL + x * y
++LL ~ };
++ |
++
++error: try not to call a closure in the expression where it is declared
++ --> $DIR/redundant_closure_call_fixable.rs:27:13
++ |
++LL | let d = (async || something().await)();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try doing something like: `async { something().await }`
++
++error: aborting due to 4 previous errors
+
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+// run-rustfix
+
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::disallowed_methods)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::mixed_read_write_in_expression)]
+#![allow(clippy::for_loops_over_fallibles)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::match_result_ok)]
++#![allow(clippy::overly_complex_bool_expr)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::needless_borrow)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::recursive_format_impl)]
+#![allow(clippy::invisible_characters)]
+#![allow(drop_bounds)]
+#![allow(array_into_iter)]
+#![allow(invalid_atomic_ordering)]
+#![allow(invalid_value)]
+#![allow(enum_intrinsics_non_enums)]
+#![allow(non_fmt_panics)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(unknown_lints)]
+#![allow(unused_labels)]
++#![warn(clippy::disallowed_names)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::box_collection)]
+#![warn(clippy::redundant_static_lifetimes)]
+#![warn(clippy::cognitive_complexity)]
+#![warn(clippy::disallowed_methods)]
+#![warn(clippy::disallowed_types)]
+#![warn(clippy::mixed_read_write_in_expression)]
+#![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::useless_conversion)]
+#![warn(clippy::match_result_ok)]
++#![warn(clippy::overly_complex_bool_expr)]
+#![warn(clippy::new_without_default)]
+#![warn(clippy::bind_instead_of_map)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::needless_borrow)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::single_char_add_str)]
+#![warn(clippy::module_name_repetitions)]
+#![warn(clippy::recursive_format_impl)]
+#![warn(clippy::invisible_characters)]
+#![warn(drop_bounds)]
+#![warn(array_into_iter)]
+#![warn(invalid_atomic_ordering)]
+#![warn(invalid_value)]
+#![warn(enum_intrinsics_non_enums)]
+#![warn(non_fmt_panics)]
+#![warn(temporary_cstring_as_ptr)]
+#![warn(unknown_lints)]
+#![warn(unused_labels)]
+
+fn main() {}
--- /dev/null
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+// run-rustfix
+
++#![allow(clippy::disallowed_names)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::disallowed_methods)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::mixed_read_write_in_expression)]
+#![allow(clippy::for_loops_over_fallibles)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::match_result_ok)]
++#![allow(clippy::overly_complex_bool_expr)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::needless_borrow)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::recursive_format_impl)]
+#![allow(clippy::invisible_characters)]
+#![allow(drop_bounds)]
+#![allow(array_into_iter)]
+#![allow(invalid_atomic_ordering)]
+#![allow(invalid_value)]
+#![allow(enum_intrinsics_non_enums)]
+#![allow(non_fmt_panics)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(unknown_lints)]
+#![allow(unused_labels)]
++#![warn(clippy::blacklisted_name)]
+#![warn(clippy::block_in_if_condition_expr)]
+#![warn(clippy::block_in_if_condition_stmt)]
+#![warn(clippy::box_vec)]
+#![warn(clippy::const_static_lifetime)]
+#![warn(clippy::cyclomatic_complexity)]
+#![warn(clippy::disallowed_method)]
+#![warn(clippy::disallowed_type)]
+#![warn(clippy::eval_order_dependence)]
+#![warn(clippy::for_loop_over_option)]
+#![warn(clippy::for_loop_over_result)]
+#![warn(clippy::identity_conversion)]
+#![warn(clippy::if_let_some_result)]
++#![warn(clippy::logic_bug)]
+#![warn(clippy::new_without_default_derive)]
+#![warn(clippy::option_and_then_some)]
+#![warn(clippy::option_expect_used)]
+#![warn(clippy::option_map_unwrap_or)]
+#![warn(clippy::option_map_unwrap_or_else)]
+#![warn(clippy::option_unwrap_used)]
+#![warn(clippy::ref_in_deref)]
+#![warn(clippy::result_expect_used)]
+#![warn(clippy::result_map_unwrap_or_else)]
+#![warn(clippy::result_unwrap_used)]
+#![warn(clippy::single_char_push_str)]
+#![warn(clippy::stutter)]
+#![warn(clippy::to_string_in_display)]
+#![warn(clippy::zero_width_space)]
+#![warn(clippy::drop_bounds)]
+#![warn(clippy::into_iter_on_array)]
+#![warn(clippy::invalid_atomic_ordering)]
+#![warn(clippy::invalid_ref)]
+#![warn(clippy::mem_discriminant_non_enum)]
+#![warn(clippy::panic_params)]
+#![warn(clippy::temporary_cstring_as_ptr)]
+#![warn(clippy::unknown_clippy_lints)]
+#![warn(clippy::unused_label)]
+
+fn main() {}
--- /dev/null
- --> $DIR/rename.rs:36:9
++error: lint `clippy::blacklisted_name` has been renamed to `clippy::disallowed_names`
++ --> $DIR/rename.rs:38:9
++ |
++LL | #![warn(clippy::blacklisted_name)]
++ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_names`
++ |
++ = note: `-D renamed-and-removed-lints` implied by `-D warnings`
++
+error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_if_conditions`
- |
- = note: `-D renamed-and-removed-lints` implied by `-D warnings`
++ --> $DIR/rename.rs:39:9
+ |
+LL | #![warn(clippy::block_in_if_condition_expr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
- --> $DIR/rename.rs:37:9
+
+error: lint `clippy::block_in_if_condition_stmt` has been renamed to `clippy::blocks_in_if_conditions`
- --> $DIR/rename.rs:38:9
++ --> $DIR/rename.rs:40:9
+ |
+LL | #![warn(clippy::block_in_if_condition_stmt)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
+
+error: lint `clippy::box_vec` has been renamed to `clippy::box_collection`
- --> $DIR/rename.rs:39:9
++ --> $DIR/rename.rs:41:9
+ |
+LL | #![warn(clippy::box_vec)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::box_collection`
+
+error: lint `clippy::const_static_lifetime` has been renamed to `clippy::redundant_static_lifetimes`
- --> $DIR/rename.rs:40:9
++ --> $DIR/rename.rs:42:9
+ |
+LL | #![warn(clippy::const_static_lifetime)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::redundant_static_lifetimes`
+
+error: lint `clippy::cyclomatic_complexity` has been renamed to `clippy::cognitive_complexity`
- --> $DIR/rename.rs:41:9
++ --> $DIR/rename.rs:43:9
+ |
+LL | #![warn(clippy::cyclomatic_complexity)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
+
+error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
- --> $DIR/rename.rs:42:9
++ --> $DIR/rename.rs:44:9
+ |
+LL | #![warn(clippy::disallowed_method)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
+
+error: lint `clippy::disallowed_type` has been renamed to `clippy::disallowed_types`
- --> $DIR/rename.rs:43:9
++ --> $DIR/rename.rs:45:9
+ |
+LL | #![warn(clippy::disallowed_type)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_types`
+
+error: lint `clippy::eval_order_dependence` has been renamed to `clippy::mixed_read_write_in_expression`
- --> $DIR/rename.rs:44:9
++ --> $DIR/rename.rs:46:9
+ |
+LL | #![warn(clippy::eval_order_dependence)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::mixed_read_write_in_expression`
+
+error: lint `clippy::for_loop_over_option` has been renamed to `clippy::for_loops_over_fallibles`
- --> $DIR/rename.rs:45:9
++ --> $DIR/rename.rs:47:9
+ |
+LL | #![warn(clippy::for_loop_over_option)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::for_loops_over_fallibles`
+
+error: lint `clippy::for_loop_over_result` has been renamed to `clippy::for_loops_over_fallibles`
- --> $DIR/rename.rs:46:9
++ --> $DIR/rename.rs:48:9
+ |
+LL | #![warn(clippy::for_loop_over_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::for_loops_over_fallibles`
+
+error: lint `clippy::identity_conversion` has been renamed to `clippy::useless_conversion`
- --> $DIR/rename.rs:47:9
++ --> $DIR/rename.rs:49:9
+ |
+LL | #![warn(clippy::identity_conversion)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::useless_conversion`
+
+error: lint `clippy::if_let_some_result` has been renamed to `clippy::match_result_ok`
- --> $DIR/rename.rs:48:9
++ --> $DIR/rename.rs:50:9
+ |
+LL | #![warn(clippy::if_let_some_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::match_result_ok`
+
++error: lint `clippy::logic_bug` has been renamed to `clippy::overly_complex_bool_expr`
++ --> $DIR/rename.rs:51:9
++ |
++LL | #![warn(clippy::logic_bug)]
++ | ^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::overly_complex_bool_expr`
++
+error: lint `clippy::new_without_default_derive` has been renamed to `clippy::new_without_default`
- --> $DIR/rename.rs:49:9
++ --> $DIR/rename.rs:52:9
+ |
+LL | #![warn(clippy::new_without_default_derive)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::new_without_default`
+
+error: lint `clippy::option_and_then_some` has been renamed to `clippy::bind_instead_of_map`
- --> $DIR/rename.rs:50:9
++ --> $DIR/rename.rs:53:9
+ |
+LL | #![warn(clippy::option_and_then_some)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::bind_instead_of_map`
+
+error: lint `clippy::option_expect_used` has been renamed to `clippy::expect_used`
- --> $DIR/rename.rs:51:9
++ --> $DIR/rename.rs:54:9
+ |
+LL | #![warn(clippy::option_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::option_map_unwrap_or` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:52:9
++ --> $DIR/rename.rs:55:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:53:9
++ --> $DIR/rename.rs:56:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_unwrap_used` has been renamed to `clippy::unwrap_used`
- --> $DIR/rename.rs:54:9
++ --> $DIR/rename.rs:57:9
+ |
+LL | #![warn(clippy::option_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
- --> $DIR/rename.rs:55:9
++ --> $DIR/rename.rs:58:9
+ |
+LL | #![warn(clippy::ref_in_deref)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
+
+error: lint `clippy::result_expect_used` has been renamed to `clippy::expect_used`
- --> $DIR/rename.rs:56:9
++ --> $DIR/rename.rs:59:9
+ |
+LL | #![warn(clippy::result_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::result_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
- --> $DIR/rename.rs:57:9
++ --> $DIR/rename.rs:60:9
+ |
+LL | #![warn(clippy::result_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::result_unwrap_used` has been renamed to `clippy::unwrap_used`
- --> $DIR/rename.rs:58:9
++ --> $DIR/rename.rs:61:9
+ |
+LL | #![warn(clippy::result_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::single_char_push_str` has been renamed to `clippy::single_char_add_str`
- --> $DIR/rename.rs:59:9
++ --> $DIR/rename.rs:62:9
+ |
+LL | #![warn(clippy::single_char_push_str)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::single_char_add_str`
+
+error: lint `clippy::stutter` has been renamed to `clippy::module_name_repetitions`
- --> $DIR/rename.rs:60:9
++ --> $DIR/rename.rs:63:9
+ |
+LL | #![warn(clippy::stutter)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::module_name_repetitions`
+
+error: lint `clippy::to_string_in_display` has been renamed to `clippy::recursive_format_impl`
- --> $DIR/rename.rs:61:9
++ --> $DIR/rename.rs:64:9
+ |
+LL | #![warn(clippy::to_string_in_display)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::recursive_format_impl`
+
+error: lint `clippy::zero_width_space` has been renamed to `clippy::invisible_characters`
- --> $DIR/rename.rs:62:9
++ --> $DIR/rename.rs:65:9
+ |
+LL | #![warn(clippy::zero_width_space)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::invisible_characters`
+
+error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
- --> $DIR/rename.rs:63:9
++ --> $DIR/rename.rs:66:9
+ |
+LL | #![warn(clippy::drop_bounds)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
+
+error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
- --> $DIR/rename.rs:64:9
++ --> $DIR/rename.rs:67:9
+ |
+LL | #![warn(clippy::into_iter_on_array)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
+
+error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
- --> $DIR/rename.rs:65:9
++ --> $DIR/rename.rs:68:9
+ |
+LL | #![warn(clippy::invalid_atomic_ordering)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
+
+error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
- --> $DIR/rename.rs:66:9
++ --> $DIR/rename.rs:69:9
+ |
+LL | #![warn(clippy::invalid_ref)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
+
+error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
- --> $DIR/rename.rs:67:9
++ --> $DIR/rename.rs:70:9
+ |
+LL | #![warn(clippy::mem_discriminant_non_enum)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
+
+error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
- --> $DIR/rename.rs:68:9
++ --> $DIR/rename.rs:71:9
+ |
+LL | #![warn(clippy::panic_params)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
+
+error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
- --> $DIR/rename.rs:69:9
++ --> $DIR/rename.rs:72:9
+ |
+LL | #![warn(clippy::temporary_cstring_as_ptr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
+
+error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
- --> $DIR/rename.rs:70:9
++ --> $DIR/rename.rs:73:9
+ |
+LL | #![warn(clippy::unknown_clippy_lints)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
+
+error: lint `clippy::unused_label` has been renamed to `unused_labels`
- error: aborting due to 35 previous errors
++ --> $DIR/rename.rs:74:9
+ |
+LL | #![warn(clippy::unused_label)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
+
++error: aborting due to 37 previous errors
+
--- /dev/null
- if v.pop() == None {
+#![feature(adt_const_params)]
+#![allow(incomplete_features)]
+#![warn(clippy::same_functions_in_if_condition)]
+#![allow(clippy::ifs_same_cond)] // This warning is different from `ifs_same_cond`.
+#![allow(clippy::if_same_then_else, clippy::comparison_chain)] // all empty blocks
+
+fn function() -> bool {
+ true
+}
+
+fn fn_arg(_arg: u8) -> bool {
+ true
+}
+
+struct Struct;
+
+impl Struct {
+ fn method(&self) -> bool {
+ true
+ }
+ fn method_arg(&self, _arg: u8) -> bool {
+ true
+ }
+}
+
+fn ifs_same_cond_fn() {
+ let a = 0;
+ let obj = Struct;
+
+ if function() {
+ } else if function() {
+ //~ ERROR ifs same condition
+ }
+
+ if fn_arg(a) {
+ } else if fn_arg(a) {
+ //~ ERROR ifs same condition
+ }
+
+ if obj.method() {
+ } else if obj.method() {
+ //~ ERROR ifs same condition
+ }
+
+ if obj.method_arg(a) {
+ } else if obj.method_arg(a) {
+ //~ ERROR ifs same condition
+ }
+
+ let mut v = vec![1];
- } else if v.pop() == None {
++ if v.pop().is_none() {
+ //~ ERROR ifs same condition
++ } else if v.pop().is_none() {
+ }
+
+ if v.len() == 42 {
+ //~ ERROR ifs same condition
+ } else if v.len() == 42 {
+ }
+
+ if v.len() == 1 {
+ // ok, different conditions
+ } else if v.len() == 2 {
+ }
+
+ if fn_arg(0) {
+ // ok, different arguments.
+ } else if fn_arg(1) {
+ }
+
+ if obj.method_arg(0) {
+ // ok, different arguments.
+ } else if obj.method_arg(1) {
+ }
+
+ if a == 1 {
+ // ok, warning is on `ifs_same_cond` behalf.
+ } else if a == 1 {
+ }
+}
+
+fn main() {
+ // macro as condition (see #6168)
+ let os = if cfg!(target_os = "macos") {
+ "macos"
+ } else if cfg!(target_os = "windows") {
+ "windows"
+ } else {
+ "linux"
+ };
+ println!("{}", os);
+
+ #[derive(PartialEq, Eq)]
+ enum E {
+ A,
+ B,
+ }
+ fn generic<const P: E>() -> bool {
+ match P {
+ E::A => true,
+ E::B => false,
+ }
+ }
+ if generic::<{ E::A }>() {
+ println!("A");
+ } else if generic::<{ E::B }>() {
+ println!("B");
+ }
+}
--- /dev/null
- LL | } else if v.pop() == None {
- | ^^^^^^^^^^^^^^^
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:31:15
+ |
+LL | } else if function() {
+ | ^^^^^^^^^^
+ |
+ = note: `-D clippy::same-functions-in-if-condition` implied by `-D warnings`
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:30:8
+ |
+LL | if function() {
+ | ^^^^^^^^^^
+
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:36:15
+ |
+LL | } else if fn_arg(a) {
+ | ^^^^^^^^^
+ |
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:35:8
+ |
+LL | if fn_arg(a) {
+ | ^^^^^^^^^
+
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:41:15
+ |
+LL | } else if obj.method() {
+ | ^^^^^^^^^^^^
+ |
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:40:8
+ |
+LL | if obj.method() {
+ | ^^^^^^^^^^^^
+
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:46:15
+ |
+LL | } else if obj.method_arg(a) {
+ | ^^^^^^^^^^^^^^^^^
+ |
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:45:8
+ |
+LL | if obj.method_arg(a) {
+ | ^^^^^^^^^^^^^^^^^
+
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:53:15
+ |
- LL | if v.pop() == None {
- | ^^^^^^^^^^^^^^^
++LL | } else if v.pop().is_none() {
++ | ^^^^^^^^^^^^^^^^^
+ |
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:51:8
+ |
++LL | if v.pop().is_none() {
++ | ^^^^^^^^^^^^^^^^^
+
+error: this `if` has the same function call as a previous `if`
+ --> $DIR/same_functions_in_if_condition.rs:58:15
+ |
+LL | } else if v.len() == 42 {
+ | ^^^^^^^^^^^^^
+ |
+note: same as this
+ --> $DIR/same_functions_in_if_condition.rs:56:8
+ |
+LL | if v.len() == 42 {
+ | ^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
+
--- /dev/null
- #![allow(clippy::blacklisted_name)]
+// aux-build:option_helpers.rs
+
+#![warn(clippy::skip_while_next)]
++#![allow(clippy::disallowed_names)]
+
+extern crate option_helpers;
+use option_helpers::IteratorFalsePositives;
+
+#[rustfmt::skip]
+fn skip_while_next() {
+ let v = vec![3, 2, 1, 0, -1, -2, -3];
+
+ // Single-line case.
+ let _ = v.iter().skip_while(|&x| *x < 0).next();
+
+ // Multi-line case.
+ let _ = v.iter().skip_while(|&x| {
+ *x < 0
+ }
+ ).next();
+
+ // Check that hat we don't lint if the caller is not an `Iterator`.
+ let foo = IteratorFalsePositives { foo: 0 };
+ let _ = foo.skip_while().next();
+}
+
+fn main() {
+ skip_while_next();
+}
--- /dev/null
- clippy::blacklisted_name,
+// run-rustfix
+
+#![warn(clippy::all)]
+#![allow(
++ clippy::disallowed_names,
+ clippy::no_effect,
+ clippy::redundant_clone,
+ redundant_semicolons,
+ dead_code,
+ unused_assignments
+)]
+
+struct Foo(u32);
+
+#[derive(Clone)]
+struct Bar {
+ a: u32,
+ b: u32,
+}
+
+fn field() {
+ let mut bar = Bar { a: 1, b: 2 };
+
+ std::mem::swap(&mut bar.a, &mut bar.b);
+
+ let mut baz = vec![bar.clone(), bar.clone()];
+ let temp = baz[0].a;
+ baz[0].a = baz[1].a;
+ baz[1].a = temp;
+}
+
+fn array() {
+ let mut foo = [1, 2];
+ foo.swap(0, 1);
+
+ foo.swap(0, 1);
+}
+
+fn slice() {
+ let foo = &mut [1, 2];
+ foo.swap(0, 1);
+
+ foo.swap(0, 1);
+}
+
+fn unswappable_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ let temp = foo[0][1];
+ foo[0][1] = foo[1][0];
+ foo[1][0] = temp;
+
+ // swap(foo[0][1], foo[1][0]) would fail
+ // this could use split_at_mut and mem::swap, but that is not much simpler.
+}
+
+fn vec() {
+ let mut foo = vec![1, 2];
+ foo.swap(0, 1);
+
+ foo.swap(0, 1);
+}
+
+fn xor_swap_locals() {
+ // This is an xor-based swap of local variables.
+ let mut a = 0;
+ let mut b = 1;
+ std::mem::swap(&mut a, &mut b)
+}
+
+fn xor_field_swap() {
+ // This is an xor-based swap of fields in a struct.
+ let mut bar = Bar { a: 0, b: 1 };
+ std::mem::swap(&mut bar.a, &mut bar.b)
+}
+
+fn xor_slice_swap() {
+ // This is an xor-based swap of a slice
+ let foo = &mut [1, 2];
+ foo.swap(0, 1)
+}
+
+fn xor_no_swap() {
+ // This is a sequence of xor-assignment statements that doesn't result in a swap.
+ let mut a = 0;
+ let mut b = 1;
+ let mut c = 2;
+ a ^= b;
+ b ^= c;
+ a ^= c;
+ c ^= a;
+}
+
+fn xor_unswappable_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ foo[0][1] ^= foo[1][0];
+ foo[1][0] ^= foo[0][0];
+ foo[0][1] ^= foo[1][0];
+
+ // swap(foo[0][1], foo[1][0]) would fail
+ // this could use split_at_mut and mem::swap, but that is not much simpler.
+}
+
+fn distinct_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ let bar = &mut [vec![1, 2], vec![3, 4]];
+ std::mem::swap(&mut foo[0][1], &mut bar[1][0]);
+}
+
+#[rustfmt::skip]
+fn main() {
+
+ let mut a = 42;
+ let mut b = 1337;
+
+ std::mem::swap(&mut a, &mut b);
+
+ ; std::mem::swap(&mut a, &mut b);
+
+ let mut c = Foo(42);
+
+ std::mem::swap(&mut c.0, &mut a);
+
+ ; std::mem::swap(&mut c.0, &mut a);
+}
+
+fn issue_8154() {
+ struct S1 {
+ x: i32,
+ y: i32,
+ }
+ struct S2(S1);
+ struct S3<'a, 'b>(&'a mut &'b mut S1);
+
+ impl std::ops::Deref for S2 {
+ type Target = S1;
+ fn deref(&self) -> &Self::Target {
+ &self.0
+ }
+ }
+ impl std::ops::DerefMut for S2 {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ &mut self.0
+ }
+ }
+
+ // Don't lint. `s.0` is mutably borrowed by `s.x` and `s.y` via the deref impl.
+ let mut s = S2(S1 { x: 0, y: 0 });
+ let t = s.x;
+ s.x = s.y;
+ s.y = t;
+
+ // Accessing through a mutable reference is fine
+ let mut s = S1 { x: 0, y: 0 };
+ let mut s = &mut s;
+ let s = S3(&mut s);
+ std::mem::swap(&mut s.0.x, &mut s.0.y);
+}
--- /dev/null
- clippy::blacklisted_name,
+// run-rustfix
+
+#![warn(clippy::all)]
+#![allow(
++ clippy::disallowed_names,
+ clippy::no_effect,
+ clippy::redundant_clone,
+ redundant_semicolons,
+ dead_code,
+ unused_assignments
+)]
+
+struct Foo(u32);
+
+#[derive(Clone)]
+struct Bar {
+ a: u32,
+ b: u32,
+}
+
+fn field() {
+ let mut bar = Bar { a: 1, b: 2 };
+
+ let temp = bar.a;
+ bar.a = bar.b;
+ bar.b = temp;
+
+ let mut baz = vec![bar.clone(), bar.clone()];
+ let temp = baz[0].a;
+ baz[0].a = baz[1].a;
+ baz[1].a = temp;
+}
+
+fn array() {
+ let mut foo = [1, 2];
+ let temp = foo[0];
+ foo[0] = foo[1];
+ foo[1] = temp;
+
+ foo.swap(0, 1);
+}
+
+fn slice() {
+ let foo = &mut [1, 2];
+ let temp = foo[0];
+ foo[0] = foo[1];
+ foo[1] = temp;
+
+ foo.swap(0, 1);
+}
+
+fn unswappable_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ let temp = foo[0][1];
+ foo[0][1] = foo[1][0];
+ foo[1][0] = temp;
+
+ // swap(foo[0][1], foo[1][0]) would fail
+ // this could use split_at_mut and mem::swap, but that is not much simpler.
+}
+
+fn vec() {
+ let mut foo = vec![1, 2];
+ let temp = foo[0];
+ foo[0] = foo[1];
+ foo[1] = temp;
+
+ foo.swap(0, 1);
+}
+
+fn xor_swap_locals() {
+ // This is an xor-based swap of local variables.
+ let mut a = 0;
+ let mut b = 1;
+ a ^= b;
+ b ^= a;
+ a ^= b;
+}
+
+fn xor_field_swap() {
+ // This is an xor-based swap of fields in a struct.
+ let mut bar = Bar { a: 0, b: 1 };
+ bar.a ^= bar.b;
+ bar.b ^= bar.a;
+ bar.a ^= bar.b;
+}
+
+fn xor_slice_swap() {
+ // This is an xor-based swap of a slice
+ let foo = &mut [1, 2];
+ foo[0] ^= foo[1];
+ foo[1] ^= foo[0];
+ foo[0] ^= foo[1];
+}
+
+fn xor_no_swap() {
+ // This is a sequence of xor-assignment statements that doesn't result in a swap.
+ let mut a = 0;
+ let mut b = 1;
+ let mut c = 2;
+ a ^= b;
+ b ^= c;
+ a ^= c;
+ c ^= a;
+}
+
+fn xor_unswappable_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ foo[0][1] ^= foo[1][0];
+ foo[1][0] ^= foo[0][0];
+ foo[0][1] ^= foo[1][0];
+
+ // swap(foo[0][1], foo[1][0]) would fail
+ // this could use split_at_mut and mem::swap, but that is not much simpler.
+}
+
+fn distinct_slice() {
+ let foo = &mut [vec![1, 2], vec![3, 4]];
+ let bar = &mut [vec![1, 2], vec![3, 4]];
+ let temp = foo[0][1];
+ foo[0][1] = bar[1][0];
+ bar[1][0] = temp;
+}
+
+#[rustfmt::skip]
+fn main() {
+
+ let mut a = 42;
+ let mut b = 1337;
+
+ a = b;
+ b = a;
+
+ ; let t = a;
+ a = b;
+ b = t;
+
+ let mut c = Foo(42);
+
+ c.0 = a;
+ a = c.0;
+
+ ; let t = c.0;
+ c.0 = a;
+ a = t;
+}
+
+fn issue_8154() {
+ struct S1 {
+ x: i32,
+ y: i32,
+ }
+ struct S2(S1);
+ struct S3<'a, 'b>(&'a mut &'b mut S1);
+
+ impl std::ops::Deref for S2 {
+ type Target = S1;
+ fn deref(&self) -> &Self::Target {
+ &self.0
+ }
+ }
+ impl std::ops::DerefMut for S2 {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ &mut self.0
+ }
+ }
+
+ // Don't lint. `s.0` is mutably borrowed by `s.x` and `s.y` via the deref impl.
+ let mut s = S2(S1 { x: 0, y: 0 });
+ let t = s.x;
+ s.x = s.y;
+ s.y = t;
+
+ // Accessing through a mutable reference is fine
+ let mut s = S1 { x: 0, y: 0 };
+ let mut s = &mut s;
+ let s = S3(&mut s);
+ let t = s.0.x;
+ s.0.x = s.0.y;
+ s.0.y = t;
+}
--- /dev/null
- #![allow(clippy::blacklisted_name, clippy::redundant_field_names)]
+// normalize-stderr-test "\(\d+ byte\)" -> "(N byte)"
+// normalize-stderr-test "\(limit: \d+ byte\)" -> "(limit: N byte)"
+
+#![deny(clippy::trivially_copy_pass_by_ref)]
++#![allow(clippy::disallowed_names, clippy::redundant_field_names)]
+
+#[derive(Copy, Clone)]
+struct Foo(u32);
+
+#[derive(Copy, Clone)]
+struct Bar([u8; 24]);
+
+#[derive(Copy, Clone)]
+pub struct Color {
+ pub r: u8,
+ pub g: u8,
+ pub b: u8,
+ pub a: u8,
+}
+
+struct FooRef<'a> {
+ foo: &'a Foo,
+}
+
+type Baz = u32;
+
+fn good(a: &mut u32, b: u32, c: &Bar) {}
+
+fn good_return_implicit_lt_ref(foo: &Foo) -> &u32 {
+ &foo.0
+}
+
+#[allow(clippy::needless_lifetimes)]
+fn good_return_explicit_lt_ref<'a>(foo: &'a Foo) -> &'a u32 {
+ &foo.0
+}
+
+fn good_return_implicit_lt_struct(foo: &Foo) -> FooRef {
+ FooRef { foo }
+}
+
+#[allow(clippy::needless_lifetimes)]
+fn good_return_explicit_lt_struct<'a>(foo: &'a Foo) -> FooRef<'a> {
+ FooRef { foo }
+}
+
+fn bad(x: &u32, y: &Foo, z: &Baz) {}
+
+impl Foo {
+ fn good(self, a: &mut u32, b: u32, c: &Bar) {}
+
+ fn good2(&mut self) {}
+
+ fn bad(&self, x: &u32, y: &Foo, z: &Baz) {}
+
+ fn bad2(x: &u32, y: &Foo, z: &Baz) {}
+
+ fn bad_issue7518(self, other: &Self) {}
+}
+
+impl AsRef<u32> for Foo {
+ fn as_ref(&self) -> &u32 {
+ &self.0
+ }
+}
+
+impl Bar {
+ fn good(&self, a: &mut u32, b: u32, c: &Bar) {}
+
+ fn bad2(x: &u32, y: &Foo, z: &Baz) {}
+}
+
+trait MyTrait {
+ fn trait_method(&self, _foo: &Foo);
+}
+
+pub trait MyTrait2 {
+ fn trait_method2(&self, _color: &Color);
+}
+
+impl MyTrait for Foo {
+ fn trait_method(&self, _foo: &Foo) {
+ unimplemented!()
+ }
+}
+
+#[allow(unused_variables)]
+mod issue3992 {
+ pub trait A {
+ #[allow(clippy::trivially_copy_pass_by_ref)]
+ fn a(b: &u16) {}
+ }
+
+ #[allow(clippy::trivially_copy_pass_by_ref)]
+ pub fn c(d: &u16) {}
+}
+
+mod issue5876 {
+ // Don't lint here as it is always inlined
+ #[inline(always)]
+ fn foo_always(x: &i32) {
+ println!("{}", x);
+ }
+
+ #[inline(never)]
+ fn foo_never(x: &i32) {
+ println!("{}", x);
+ }
+
+ #[inline]
+ fn foo(x: &i32) {
+ println!("{}", x);
+ }
+}
+
+fn _ref_to_opt_ref_implicit(x: &u32) -> Option<&u32> {
+ Some(x)
+}
+
+#[allow(clippy::needless_lifetimes)]
+fn _ref_to_opt_ref_explicit<'a>(x: &'a u32) -> Option<&'a u32> {
+ Some(x)
+}
+
+fn _with_constraint<'a, 'b: 'a>(x: &'b u32, y: &'a u32) -> &'a u32 {
+ if true { x } else { y }
+}
+
+async fn _async_implicit(x: &u32) -> &u32 {
+ x
+}
+
+#[allow(clippy::needless_lifetimes)]
+async fn _async_explicit<'a>(x: &'a u32) -> &'a u32 {
+ x
+}
+
+fn _unrelated_lifetimes<'a, 'b>(_x: &'a u32, y: &'b u32) -> &'b u32 {
+ y
+}
+
+fn _return_ptr(x: &u32) -> *const u32 {
+ x
+}
+
+fn _return_field_ptr(x: &(u32, u32)) -> *const u32 {
+ &x.0
+}
+
+fn _return_field_ptr_addr_of(x: &(u32, u32)) -> *const u32 {
+ core::ptr::addr_of!(x.0)
+}
+
+fn main() {
+ let (mut foo, bar) = (Foo(0), Bar([0; 24]));
+ let (mut a, b, c, x, y, z) = (0, 0, Bar([0; 24]), 0, Foo(0), 0);
+ good(&mut a, b, &c);
+ good_return_implicit_lt_ref(&y);
+ good_return_explicit_lt_ref(&y);
+ bad(&x, &y, &z);
+ foo.good(&mut a, b, &c);
+ foo.good2();
+ foo.bad(&x, &y, &z);
+ Foo::bad2(&x, &y, &z);
+ bar.good(&mut a, b, &c);
+ Bar::bad2(&x, &y, &z);
+ foo.as_ref();
+}
--- /dev/null
- clippy::let_unit_value
++// aux-build: proc_macro_with_span.rs
++
+#![warn(clippy::unit_arg)]
+#![allow(
+ clippy::no_effect,
+ unused_must_use,
+ unused_variables,
+ clippy::unused_unit,
+ clippy::unnecessary_wraps,
+ clippy::or_fun_call,
+ clippy::needless_question_mark,
+ clippy::self_named_constructors,
++ clippy::let_unit_value,
++ clippy::never_loop
+)]
+
++extern crate proc_macro_with_span;
++
++use proc_macro_with_span::with_span;
+use std::fmt::Debug;
+
+fn foo<T: Debug>(t: T) {
+ println!("{:?}", t);
+}
+
+fn foo3<T1: Debug, T2: Debug, T3: Debug>(t1: T1, t2: T2, t3: T3) {
+ println!("{:?}, {:?}, {:?}", t1, t2, t3);
+}
+
+struct Bar;
+
+impl Bar {
+ fn bar<T: Debug>(&self, t: T) {
+ println!("{:?}", t);
+ }
+}
+
+fn baz<T: Debug>(t: T) {
+ foo(t);
+}
+
+trait Tr {
+ type Args;
+ fn do_it(args: Self::Args);
+}
+
+struct A;
+impl Tr for A {
+ type Args = ();
+ fn do_it(_: Self::Args) {}
+}
+
+struct B;
+impl Tr for B {
+ type Args = <A as Tr>::Args;
+
+ fn do_it(args: Self::Args) {
+ A::do_it(args)
+ }
+}
+
+fn bad() {
+ foo({
+ 1;
+ });
+ foo(foo(1));
+ foo({
+ foo(1);
+ foo(2);
+ });
+ let b = Bar;
+ b.bar({
+ 1;
+ });
+ taking_multiple_units(foo(0), foo(1));
+ taking_multiple_units(foo(0), {
+ foo(1);
+ foo(2);
+ });
+ taking_multiple_units(
+ {
+ foo(0);
+ foo(1);
+ },
+ {
+ foo(2);
+ foo(3);
+ },
+ );
+ // here Some(foo(2)) isn't the top level statement expression, wrap the suggestion in a block
+ None.or(Some(foo(2)));
+ // in this case, the suggestion can be inlined, no need for a surrounding block
+ // foo(()); foo(()) instead of { foo(()); foo(()) }
+ foo(foo(()));
+}
+
+fn ok() {
+ foo(());
+ foo(1);
+ foo({ 1 });
+ foo3("a", 3, vec![3]);
+ let b = Bar;
+ b.bar({ 1 });
+ b.bar(());
+ question_mark();
+ let named_unit_arg = ();
+ foo(named_unit_arg);
+ baz(());
+ B::do_it(());
+}
+
+fn question_mark() -> Result<(), ()> {
+ Ok(Ok(())?)?;
+ Ok(Ok(()))??;
+ Ok(())
+}
+
+#[allow(dead_code)]
+mod issue_2945 {
+ fn unit_fn() -> Result<(), i32> {
+ Ok(())
+ }
+
+ fn fallible() -> Result<(), i32> {
+ Ok(unit_fn()?)
+ }
+}
+
+#[allow(dead_code)]
+fn returning_expr() -> Option<()> {
+ Some(foo(1))
+}
+
+fn taking_multiple_units(a: (), b: ()) {}
+
++fn proc_macro() {
++ with_span!(span taking_multiple_units(unsafe { (); }, 'x: loop { break 'x (); }));
++}
++
+fn main() {
+ bad();
+ ok();
+}
--- /dev/null
- --> $DIR/unit_arg.rs:57:5
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:60:5
++ --> $DIR/unit_arg.rs:63:5
+ |
+LL | / foo({
+LL | | 1;
+LL | | });
+ | |______^
+ |
+ = note: `-D clippy::unit-arg` implied by `-D warnings`
+help: remove the semicolon from the last statement in the block
+ |
+LL | 1
+ |
+help: or move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ {
+LL + 1;
+LL + };
+LL ~ foo(());
+ |
+
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:61:5
++ --> $DIR/unit_arg.rs:66:5
+ |
+LL | foo(foo(1));
+ | ^^^^^^^^^^^
+ |
+help: move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ foo(1);
+LL ~ foo(());
+ |
+
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:66:5
++ --> $DIR/unit_arg.rs:67:5
+ |
+LL | / foo({
+LL | | foo(1);
+LL | | foo(2);
+LL | | });
+ | |______^
+ |
+help: remove the semicolon from the last statement in the block
+ |
+LL | foo(2)
+ |
+help: or move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ {
+LL + foo(1);
+LL + foo(2);
+LL + };
+LL ~ foo(());
+ |
+
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:69:5
++ --> $DIR/unit_arg.rs:72:5
+ |
+LL | / b.bar({
+LL | | 1;
+LL | | });
+ | |______^
+ |
+help: remove the semicolon from the last statement in the block
+ |
+LL | 1
+ |
+help: or move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ {
+LL + 1;
+LL + };
+LL ~ b.bar(());
+ |
+
+error: passing unit values to a function
- --> $DIR/unit_arg.rs:70:5
++ --> $DIR/unit_arg.rs:75:5
+ |
+LL | taking_multiple_units(foo(0), foo(1));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: move the expressions in front of the call and replace them with the unit literal `()`
+ |
+LL ~ foo(0);
+LL + foo(1);
+LL ~ taking_multiple_units((), ());
+ |
+
+error: passing unit values to a function
- --> $DIR/unit_arg.rs:74:5
++ --> $DIR/unit_arg.rs:76:5
+ |
+LL | / taking_multiple_units(foo(0), {
+LL | | foo(1);
+LL | | foo(2);
+LL | | });
+ | |______^
+ |
+help: remove the semicolon from the last statement in the block
+ |
+LL | foo(2)
+ |
+help: or move the expressions in front of the call and replace them with the unit literal `()`
+ |
+LL ~ foo(0);
+LL + {
+LL + foo(1);
+LL + foo(2);
+LL + };
+LL ~ taking_multiple_units((), ());
+ |
+
+error: passing unit values to a function
- --> $DIR/unit_arg.rs:85:13
++ --> $DIR/unit_arg.rs:80:5
+ |
+LL | / taking_multiple_units(
+LL | | {
+LL | | foo(0);
+LL | | foo(1);
+... |
+LL | | },
+LL | | );
+ | |_____^
+ |
+help: remove the semicolon from the last statement in the block
+ |
+LL | foo(1)
+ |
+help: remove the semicolon from the last statement in the block
+ |
+LL | foo(3)
+ |
+help: or move the expressions in front of the call and replace them with the unit literal `()`
+ |
+LL ~ {
+LL + foo(0);
+LL + foo(1);
+LL + };
+LL + {
+LL + foo(2);
+LL + foo(3);
+LL + };
+LL + taking_multiple_units(
+LL + (),
+LL + (),
+LL ~ );
+ |
+
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:88:5
++ --> $DIR/unit_arg.rs:91:13
+ |
+LL | None.or(Some(foo(2)));
+ | ^^^^^^^^^^^^
+ |
+help: move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ None.or({
+LL + foo(2);
+LL + Some(())
+LL ~ });
+ |
+
+error: passing a unit value to a function
- --> $DIR/unit_arg.rs:125:5
++ --> $DIR/unit_arg.rs:94:5
+ |
+LL | foo(foo(()));
+ | ^^^^^^^^^^^^
+ |
+help: move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ foo(());
+LL ~ foo(());
+ |
+
+error: passing a unit value to a function
++ --> $DIR/unit_arg.rs:131:5
+ |
+LL | Some(foo(1))
+ | ^^^^^^^^^^^^
+ |
+help: move the expression in front of the call and replace it with the unit literal `()`
+ |
+LL ~ foo(1);
+LL + Some(())
+ |
+
+error: aborting due to 10 previous errors
+
--- /dev/null
--- /dev/null
++#![warn(clippy::unwrap_used, clippy::expect_used)]
++
++fn main() {
++ Some(3).unwrap();
++ Some(3).expect("Hello world!");
++
++ let a: Result<i32, i32> = Ok(3);
++ a.unwrap();
++ a.expect("Hello world!");
++}
--- /dev/null
--- /dev/null
++error: used `unwrap()` on `an Option` value
++ --> $DIR/unwrap_expect_used.rs:4:5
++ |
++LL | Some(3).unwrap();
++ | ^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::unwrap-used` implied by `-D warnings`
++ = help: if this value is `None`, it will panic
++
++error: used `expect()` on `an Option` value
++ --> $DIR/unwrap_expect_used.rs:5:5
++ |
++LL | Some(3).expect("Hello world!");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = note: `-D clippy::expect-used` implied by `-D warnings`
++ = help: if this value is `None`, it will panic
++
++error: used `unwrap()` on `a Result` value
++ --> $DIR/unwrap_expect_used.rs:8:5
++ |
++LL | a.unwrap();
++ | ^^^^^^^^^^
++ |
++ = help: if this value is an `Err`, it will panic
++
++error: used `expect()` on `a Result` value
++ --> $DIR/unwrap_expect_used.rs:9:5
++ |
++LL | a.expect("Hello world!");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: if this value is an `Err`, it will panic
++
++error: aborting due to 4 previous errors
++
--- /dev/null
- #![allow(clippy::blacklisted_name, clippy::eq_op)]
+// aux-build:proc_macro_derive.rs
+
+#![feature(rustc_private)]
+#![warn(clippy::all)]
++#![allow(clippy::disallowed_names, clippy::eq_op)]
+#![warn(clippy::used_underscore_binding)]
+
+#[macro_use]
+extern crate proc_macro_derive;
+
+// This should not trigger the lint. There's underscore binding inside the external derive that
+// would trigger the `used_underscore_binding` lint.
+#[derive(DeriveSomething)]
+struct Baz;
+
+macro_rules! test_macro {
+ () => {{
+ let _foo = 42;
+ _foo + 1
+ }};
+}
+
+/// Tests that we lint if we use a binding with a single leading underscore
+fn prefix_underscore(_foo: u32) -> u32 {
+ _foo + 1
+}
+
+/// Tests that we lint if we use a `_`-variable defined outside within a macro expansion
+fn in_macro_or_desugar(_foo: u32) {
+ println!("{}", _foo);
+ assert_eq!(_foo, _foo);
+
+ test_macro!() + 1;
+}
+
+// Struct for testing use of fields prefixed with an underscore
+struct StructFieldTest {
+ _underscore_field: u32,
+}
+
+/// Tests that we lint the use of a struct field which is prefixed with an underscore
+fn in_struct_field() {
+ let mut s = StructFieldTest { _underscore_field: 0 };
+ s._underscore_field += 1;
+}
+
+/// Tests that we do not lint if the struct field is used in code created with derive.
+#[derive(Clone, Debug)]
+pub struct UnderscoreInStruct {
+ _foo: u32,
+}
+
+/// Tests that we do not lint if the underscore is not a prefix
+fn non_prefix_underscore(some_foo: u32) -> u32 {
+ some_foo + 1
+}
+
+/// Tests that we do not lint if we do not use the binding (simple case)
+fn unused_underscore_simple(_foo: u32) -> u32 {
+ 1
+}
+
+/// Tests that we do not lint if we do not use the binding (complex case). This checks for
+/// compatibility with the built-in `unused_variables` lint.
+fn unused_underscore_complex(mut _foo: u32) -> u32 {
+ _foo += 1;
+ _foo = 2;
+ 1
+}
+
+/// Test that we do not lint for multiple underscores
+fn multiple_underscores(__foo: u32) -> u32 {
+ __foo + 1
+}
+
+// Non-variable bindings with preceding underscore
+fn _fn_test() {}
+struct _StructTest;
+enum _EnumTest {
+ _Empty,
+ _Value(_StructTest),
+}
+
+/// Tests that we do not lint for non-variable bindings
+fn non_variables() {
+ _fn_test();
+ let _s = _StructTest;
+ let _e = match _EnumTest::_Value(_StructTest) {
+ _EnumTest::_Empty => 0,
+ _EnumTest::_Value(_st) => 1,
+ };
+ let f = _fn_test;
+ f();
+}
+
+// Tests that we do not lint if the binding comes from await desugaring,
+// but we do lint the awaited expression. See issue 5360.
+async fn await_desugaring() {
+ async fn foo() {}
+ fn uses_i(_i: i32) {}
+
+ foo().await;
+ ({
+ let _i = 5;
+ uses_i(_i);
+ foo()
+ })
+ .await
+}
+
+fn main() {
+ let foo = 0u32;
+ // tests of unused_underscore lint
+ let _ = prefix_underscore(foo);
+ in_macro_or_desugar(foo);
+ in_struct_field();
+ // possible false positives
+ let _ = non_prefix_underscore(foo);
+ let _ = unused_underscore_simple(foo);
+ let _ = unused_underscore_complex(foo);
+ let _ = multiple_underscores(foo);
+ non_variables();
+ await_desugaring();
+}
projects / rust.git / commitdiff