path: root/src/tools/clippy/CHANGELOG.md

# 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

[d7b5cbf0...master](https://github.com/rust-lang/rust-clippy/compare/d7b5cbf0...master)

## Rust 1.63

Current stable, released 2022-08-11

[7c21f91b...d7b5cbf0](https://github.com/rust-lang/rust-clippy/compare/7c21f91b...d7b5cbf0)

### New Lints

* [`borrow_deref_ref`]
  [#7930](https://github.com/rust-lang/rust-clippy/pull/7930)
* [`doc_link_with_quotes`]
  [#8385](https://github.com/rust-lang/rust-clippy/pull/8385)
* [`no_effect_replace`]
  [#8754](https://github.com/rust-lang/rust-clippy/pull/8754)
* [`rc_clone_in_vec_init`]
  [#8769](https://github.com/rust-lang/rust-clippy/pull/8769)
* [`derive_partial_eq_without_eq`]
  [#8796](https://github.com/rust-lang/rust-clippy/pull/8796)
* [`mismatching_type_param_order`]
  [#8831](https://github.com/rust-lang/rust-clippy/pull/8831)
* [`duplicate_mod`] [#8832](https://github.com/rust-lang/rust-clippy/pull/8832)
* [`unused_rounding`]
  [#8866](https://github.com/rust-lang/rust-clippy/pull/8866)
* [`get_first`] [#8882](https://github.com/rust-lang/rust-clippy/pull/8882)
* [`swap_ptr_to_ref`]
  [#8916](https://github.com/rust-lang/rust-clippy/pull/8916)
* [`almost_complete_letter_range`]
  [#8918](https://github.com/rust-lang/rust-clippy/pull/8918)
* [`needless_parens_on_range_literals`]
  [#8933](https://github.com/rust-lang/rust-clippy/pull/8933)
* [`as_underscore`] [#8934](https://github.com/rust-lang/rust-clippy/pull/8934)

### Moves and Deprecations

* Rename `eval_order_dependence` to [`mixed_read_write_in_expression`], move to
  `nursery` [#8621](https://github.com/rust-lang/rust-clippy/pull/8621)

### Enhancements

* [`undocumented_unsafe_blocks`]: Now also lints on unsafe trait implementations
  [#8761](https://github.com/rust-lang/rust-clippy/pull/8761)
* [`empty_line_after_outer_attr`]: Now also lints on argumentless macros
  [#8790](https://github.com/rust-lang/rust-clippy/pull/8790)
* [`expect_used`]: Now can be disabled in tests with the `allow-expect-in-tests`
  option [#8802](https://github.com/rust-lang/rust-clippy/pull/8802)
* [`unwrap_used`]: Now can be disabled in tests with the `allow-unwrap-in-tests`
  option [#8802](https://github.com/rust-lang/rust-clippy/pull/8802)
* [`disallowed_methods`]: Now also lints indirect usages
  [#8852](https://github.com/rust-lang/rust-clippy/pull/8852)
* [`get_last_with_len`]: Now also lints `VecDeque` and any deref to slice
  [#8862](https://github.com/rust-lang/rust-clippy/pull/8862)
* [`manual_range_contains`]: Now also lints on chains of `&&` and `||`
  [#8884](https://github.com/rust-lang/rust-clippy/pull/8884)
* [`rc_clone_in_vec_init`]: Now also lints on `Weak`
  [#8885](https://github.com/rust-lang/rust-clippy/pull/8885)
* [`dbg_macro`]: Introduce `allow-dbg-in-tests` config option
  [#8897](https://github.com/rust-lang/rust-clippy/pull/8897)
* [`use_self`]: Now also lints on `TupleStruct` and `Struct` patterns
  [#8899](https://github.com/rust-lang/rust-clippy/pull/8899)
* [`manual_find_map`] and [`manual_filter_map`]: Now also lints on more complex
  method chains inside `map`
  [#8930](https://github.com/rust-lang/rust-clippy/pull/8930)
* [`needless_return`]: Now also lints on macro expressions in return statements
  [#8932](https://github.com/rust-lang/rust-clippy/pull/8932)
* [`doc_markdown`]: Users can now indicate, that the `doc-valid-idents` config
  should extend the default and not replace it
  [#8944](https://github.com/rust-lang/rust-clippy/pull/8944)
* [`disallowed_names`]: Users can now indicate, that the `disallowed-names`
  config should extend the default and not replace it
  [#8944](https://github.com/rust-lang/rust-clippy/pull/8944)
* [`never_loop`]: Now checks for `continue` in struct expression
  [#9002](https://github.com/rust-lang/rust-clippy/pull/9002)

### False Positive Fixes

* [`useless_transmute`]: No longer lints on types with erased regions
  [#8564](https://github.com/rust-lang/rust-clippy/pull/8564)
* [`vec_init_then_push`]: No longer lints when further extended
  [#8699](https://github.com/rust-lang/rust-clippy/pull/8699)
* [`cmp_owned`]: No longer lints on `From::from` for `Copy` types
  [#8807](https://github.com/rust-lang/rust-clippy/pull/8807)
* [`redundant_allocation`]: No longer lints on fat pointers that would become
  thin pointers [#8813](https://github.com/rust-lang/rust-clippy/pull/8813)
* [`derive_partial_eq_without_eq`]:
    * Handle differing predicates applied by `#[derive(PartialEq)]` and
      `#[derive(Eq)]`
      [#8869](https://github.com/rust-lang/rust-clippy/pull/8869)
    * No longer lints on non-public types and better handles generics
      [#8950](https://github.com/rust-lang/rust-clippy/pull/8950)
* [`empty_line_after_outer_attr`]: No longer lints empty lines in inner
  string values [#8892](https://github.com/rust-lang/rust-clippy/pull/8892)
* [`branches_sharing_code`]: No longer lints when using different binding names
  [#8901](https://github.com/rust-lang/rust-clippy/pull/8901)
* [`significant_drop_in_scrutinee`]: No longer lints on Try `?` and `await`
  desugared expressions [#8902](https://github.com/rust-lang/rust-clippy/pull/8902)
* [`checked_conversions`]: No longer lints in `const` contexts
  [#8907](https://github.com/rust-lang/rust-clippy/pull/8907)
* [`iter_overeager_cloned`]: No longer lints on `.cloned().flatten()` when
  `T::Item` doesn't implement `IntoIterator`
  [#8960](https://github.com/rust-lang/rust-clippy/pull/8960)

### Suggestion Fixes/Improvements

* [`vec_init_then_push`]: Suggest to remove `mut` binding when possible
  [#8699](https://github.com/rust-lang/rust-clippy/pull/8699)
* [`manual_range_contains`]: Fix suggestion for integers with different signs
  [#8763](https://github.com/rust-lang/rust-clippy/pull/8763)
* [`identity_op`]: Add parenthesis to suggestions where required
  [#8786](https://github.com/rust-lang/rust-clippy/pull/8786)
* [`cast_lossless`]: No longer gives wrong suggestion on `usize`/`isize`->`f64`
  [#8778](https://github.com/rust-lang/rust-clippy/pull/8778)
* [`rc_clone_in_vec_init`]: Add suggestion
  [#8814](https://github.com/rust-lang/rust-clippy/pull/8814)
* The "unknown field" error messages for config files now wraps the field names
  [#8823](https://github.com/rust-lang/rust-clippy/pull/8823)
* [`cast_abs_to_unsigned`]: Do not remove cast if it's required
  [#8876](https://github.com/rust-lang/rust-clippy/pull/8876)
* [`significant_drop_in_scrutinee`]: Improve lint message for types that are not
  references and not trivially clone-able
  [#8902](https://github.com/rust-lang/rust-clippy/pull/8902)
* [`for_loops_over_fallibles`]: Now suggests the correct variant of `iter()`,
  `iter_mut()` or `into_iter()`
  [#8941](https://github.com/rust-lang/rust-clippy/pull/8941)

### ICE Fixes

* Fix ICE in [`let_unit_value`] when calling a `static`/`const` callable type
  [#8835](https://github.com/rust-lang/rust-clippy/pull/8835)
* Fix ICEs on callable `static`/`const`s
  [#8896](https://github.com/rust-lang/rust-clippy/pull/8896)
* [`needless_late_init`]
  [#8912](https://github.com/rust-lang/rust-clippy/pull/8912)
* Fix ICE in shadow lints
  [#8913](https://github.com/rust-lang/rust-clippy/pull/8913)

### Documentation Improvements

* Clippy has a [Book](https://doc.rust-lang.org/nightly/clippy/) now!
  [#7359](https://github.com/rust-lang/rust-clippy/pull/7359)
* Add a *copy lint name*-button to Clippy's lint list
  [#8839](https://github.com/rust-lang/rust-clippy/pull/8839)
* Display past names of renamed lints on Clippy's lint list
  [#8843](https://github.com/rust-lang/rust-clippy/pull/8843)
* Add the ability to show the lint output in the lint list
  [#8947](https://github.com/rust-lang/rust-clippy/pull/8947)

## Rust 1.62

Released 2022-06-30

[d0cf3481...7c21f91b](https://github.com/rust-lang/rust-clippy/compare/d0cf3481...7c21f91b)

### New Lints

* [`large_include_file`]
  [#8727](https://github.com/rust-lang/rust-clippy/pull/8727)
* [`cast_abs_to_unsigned`]
  [#8635](https://github.com/rust-lang/rust-clippy/pull/8635)
* [`err_expect`]
  [#8606](https://github.com/rust-lang/rust-clippy/pull/8606)
* [`unnecessary_owned_empty_strings`]
  [#8660](https://github.com/rust-lang/rust-clippy/pull/8660)
* [`empty_structs_with_brackets`]
  [#8594](https://github.com/rust-lang/rust-clippy/pull/8594)
* [`crate_in_macro_def`]
  [#8576](https://github.com/rust-lang/rust-clippy/pull/8576)
* [`needless_option_take`]
  [#8665](https://github.com/rust-lang/rust-clippy/pull/8665)
* [`bytes_count_to_len`]
  [#8711](https://github.com/rust-lang/rust-clippy/pull/8711)
* [`is_digit_ascii_radix`]
  [#8624](https://github.com/rust-lang/rust-clippy/pull/8624)
* [`await_holding_invalid_type`]
  [#8707](https://github.com/rust-lang/rust-clippy/pull/8707)
* [`trim_split_whitespace`]
  [#8575](https://github.com/rust-lang/rust-clippy/pull/8575)
* [`pub_use`]
  [#8670](https://github.com/rust-lang/rust-clippy/pull/8670)
* [`format_push_string`]
  [#8626](https://github.com/rust-lang/rust-clippy/pull/8626)
* [`empty_drop`]
  [#8571](https://github.com/rust-lang/rust-clippy/pull/8571)
* [`drop_non_drop`]
  [#8630](https://github.com/rust-lang/rust-clippy/pull/8630)
* [`forget_non_drop`]
  [#8630](https://github.com/rust-lang/rust-clippy/pull/8630)

### Moves and Deprecations

* Move [`only_used_in_recursion`] to `nursery` (now allow-by-default)
  [#8783](https://github.com/rust-lang/rust-clippy/pull/8783)
* Move [`stable_sort_primitive`] to `pedantic` (now allow-by-default)
  [#8716](https://github.com/rust-lang/rust-clippy/pull/8716)

### Enhancements

* Remove overlap between [`manual_split_once`] and [`needless_splitn`]
  [#8631](https://github.com/rust-lang/rust-clippy/pull/8631)
* [`map_identity`]: Now checks for needless `map_err`
  [#8487](https://github.com/rust-lang/rust-clippy/pull/8487)
* [`extra_unused_lifetimes`]: Now checks for impl lifetimes
  [#8737](https://github.com/rust-lang/rust-clippy/pull/8737)
* [`cast_possible_truncation`]: Now catches more cases with larger shift or divide operations
  [#8687](https://github.com/rust-lang/rust-clippy/pull/8687)
* [`identity_op`]: Now checks for modulo expressions
  [#8519](https://github.com/rust-lang/rust-clippy/pull/8519)
* [`panic`]: No longer lint in constant context
  [#8592](https://github.com/rust-lang/rust-clippy/pull/8592)
* [`manual_split_once`]: Now lints manual iteration of `splitn`
  [#8717](https://github.com/rust-lang/rust-clippy/pull/8717)
* [`self_named_module_files`], [`mod_module_files`]: Now handle relative module paths
  [#8611](https://github.com/rust-lang/rust-clippy/pull/8611)
* [`unsound_collection_transmute`]: Now has better size and alignment checks
  [#8648](https://github.com/rust-lang/rust-clippy/pull/8648)
* [`unnested_or_patterns`]: Ignore cases, where the suggestion would be longer
  [#8619](https://github.com/rust-lang/rust-clippy/pull/8619)

### False Positive Fixes

* [`rest_pat_in_fully_bound_structs`]: Now ignores structs marked with `#[non_exhaustive]`
  [#8690](https://github.com/rust-lang/rust-clippy/pull/8690)
* [`needless_late_init`]: No longer lints `if let` statements, `let mut` bindings or instances that
  changes the drop order significantly
  [#8617](https://github.com/rust-lang/rust-clippy/pull/8617)
* [`unnecessary_cast`]: No longer lints to casts to aliased or non-primitive types
  [#8596](https://github.com/rust-lang/rust-clippy/pull/8596)
* [`init_numbered_fields`]: No longer lints type aliases
  [#8780](https://github.com/rust-lang/rust-clippy/pull/8780)
* [`needless_option_as_deref`]: No longer lints for `as_deref_mut` on `Option` values that can't be moved
  [#8646](https://github.com/rust-lang/rust-clippy/pull/8646)
* [`mistyped_literal_suffixes`]: Now ignores float literals without an exponent
  [#8742](https://github.com/rust-lang/rust-clippy/pull/8742)
* [`undocumented_unsafe_blocks`]: Now ignores unsafe blocks from proc-macros and works better for sub-expressions
  [#8450](https://github.com/rust-lang/rust-clippy/pull/8450)
* [`same_functions_in_if_condition`]: Now allows different constants, even if they have the same value
  [#8673](https://github.com/rust-lang/rust-clippy/pull/8673)
* [`needless_match`]: Now checks for more complex types and ignores type coercion
  [#8549](https://github.com/rust-lang/rust-clippy/pull/8549)
* [`assertions_on_constants`]: Now ignores constants from `cfg!` macros
  [#8614](https://github.com/rust-lang/rust-clippy/pull/8614)
* [`indexing_slicing`]: Fix false positives with constant indices in
  [#8588](https://github.com/rust-lang/rust-clippy/pull/8588)
* [`iter_with_drain`]: Now ignores iterator references
  [#8668](https://github.com/rust-lang/rust-clippy/pull/8668)
* [`useless_attribute`]: Now allows [`redundant_pub_crate`] on `use` items
  [#8743](https://github.com/rust-lang/rust-clippy/pull/8743)
* [`cast_ptr_alignment`]: Now ignores expressions, when used for unaligned reads and writes
  [#8632](https://github.com/rust-lang/rust-clippy/pull/8632)
* [`wrong_self_convention`]: Now allows `&mut self` and no self as arguments for `is_*` methods
  [#8738](https://github.com/rust-lang/rust-clippy/pull/8738)
* [`mut_from_ref`]: Only lint in unsafe code
  [#8647](https://github.com/rust-lang/rust-clippy/pull/8647)
* [`redundant_pub_crate`]: Now allows macro exports
  [#8736](https://github.com/rust-lang/rust-clippy/pull/8736)
* [`needless_match`]: Ignores cases where the else block expression is different
  [#8700](https://github.com/rust-lang/rust-clippy/pull/8700)
* [`transmute_int_to_char`]: Now allows transmutations in `const` code
  [#8610](https://github.com/rust-lang/rust-clippy/pull/8610)
* [`manual_non_exhaustive`]: Ignores cases, where the enum value is used
  [#8645](https://github.com/rust-lang/rust-clippy/pull/8645)
* [`redundant_closure`]: Now ignores coerced closure
  [#8431](https://github.com/rust-lang/rust-clippy/pull/8431)
* [`identity_op`]: Is now ignored in cases where extra brackets would be needed
  [#8730](https://github.com/rust-lang/rust-clippy/pull/8730)
* [`let_unit_value`]: Now ignores cases which are used for type inference
  [#8563](https://github.com/rust-lang/rust-clippy/pull/8563)

### Suggestion Fixes/Improvements

* [`manual_split_once`]: Fixed incorrect suggestions for single result accesses
  [#8631](https://github.com/rust-lang/rust-clippy/pull/8631)
* [`bytes_nth`]: Fix typos in the diagnostic message
  [#8403](https://github.com/rust-lang/rust-clippy/pull/8403)
* [`mistyped_literal_suffixes`]: Now suggests the correct integer types
  [#8742](https://github.com/rust-lang/rust-clippy/pull/8742)
* [`unnecessary_to_owned`]: Fixed suggestion based on the configured msrv
  [#8692](https://github.com/rust-lang/rust-clippy/pull/8692)
* [`single_element_loop`]: Improve lint for Edition 2021 arrays
  [#8616](https://github.com/rust-lang/rust-clippy/pull/8616)
* [`manual_bits`]: Now includes a cast for proper type conversion, when needed
  [#8677](https://github.com/rust-lang/rust-clippy/pull/8677)
* [`option_map_unit_fn`], [`result_map_unit_fn`]: Fix some incorrect suggestions
  [#8584](https://github.com/rust-lang/rust-clippy/pull/8584)
* [`collapsible_else_if`]: Add whitespace in suggestion
  [#8729](https://github.com/rust-lang/rust-clippy/pull/8729)
* [`transmute_bytes_to_str`]: Now suggest `from_utf8_unchecked` in `const` context
  [#8612](https://github.com/rust-lang/rust-clippy/pull/8612)
* [`map_clone`]: Improve message and suggestion based on the msrv
  [#8688](https://github.com/rust-lang/rust-clippy/pull/8688)
* [`needless_late_init`]: Now shows the `let` statement where it was first initialized
  [#8779](https://github.com/rust-lang/rust-clippy/pull/8779)

### ICE Fixes

* [`only_used_in_recursion`]
  [#8691](https://github.com/rust-lang/rust-clippy/pull/8691)
* [`cast_slice_different_sizes`]
  [#8720](https://github.com/rust-lang/rust-clippy/pull/8720)
* [`iter_overeager_cloned`]
  [#8602](https://github.com/rust-lang/rust-clippy/pull/8602)
* [`undocumented_unsafe_blocks`]
  [#8686](https://github.com/rust-lang/rust-clippy/pull/8686)

## Rust 1.61

Released 2022-05-19

[57b3c4b...d0cf3481](https://github.com/rust-lang/rust-clippy/compare/57b3c4b...d0cf3481)

### New Lints

* [`only_used_in_recursion`]
  [#8422](https://github.com/rust-lang/rust-clippy/pull/8422)
* [`cast_enum_truncation`]
  [#8381](https://github.com/rust-lang/rust-clippy/pull/8381)
* [`missing_spin_loop`]
  [#8174](https://github.com/rust-lang/rust-clippy/pull/8174)
* [`deref_by_slicing`]
  [#8218](https://github.com/rust-lang/rust-clippy/pull/8218)
* [`needless_match`]
  [#8471](https://github.com/rust-lang/rust-clippy/pull/8471)
* [`allow_attributes_without_reason`] (Requires `#![feature(lint_reasons)]`)
  [#8504](https://github.com/rust-lang/rust-clippy/pull/8504)
* [`print_in_format_impl`]
  [#8253](https://github.com/rust-lang/rust-clippy/pull/8253)
* [`unnecessary_find_map`]
  [#8489](https://github.com/rust-lang/rust-clippy/pull/8489)
* [`or_then_unwrap`]
  [#8561](https://github.com/rust-lang/rust-clippy/pull/8561)
* [`unnecessary_join`]
  [#8579](https://github.com/rust-lang/rust-clippy/pull/8579)
* [`iter_with_drain`]
  [#8483](https://github.com/rust-lang/rust-clippy/pull/8483)
* [`cast_enum_constructor`]
  [#8562](https://github.com/rust-lang/rust-clippy/pull/8562)
* [`cast_slice_different_sizes`]
  [#8445](https://github.com/rust-lang/rust-clippy/pull/8445)

### Moves and Deprecations

* Moved [`transmute_undefined_repr`] to `nursery` (now allow-by-default)
  [#8432](https://github.com/rust-lang/rust-clippy/pull/8432)
* Moved [`try_err`] to `restriction`
  [#8544](https://github.com/rust-lang/rust-clippy/pull/8544)
* Move [`iter_with_drain`] to `nursery`
  [#8541](https://github.com/rust-lang/rust-clippy/pull/8541)
* Renamed `to_string_in_display` to [`recursive_format_impl`]
  [#8188](https://github.com/rust-lang/rust-clippy/pull/8188)

### Enhancements

* [`dbg_macro`]: The lint level can now be set with crate attributes and works inside macros
  [#8411](https://github.com/rust-lang/rust-clippy/pull/8411)
* [`ptr_as_ptr`]: Now works inside macros
  [#8442](https://github.com/rust-lang/rust-clippy/pull/8442)
* [`use_self`]: Now works for variants in match expressions
  [#8456](https://github.com/rust-lang/rust-clippy/pull/8456)
* [`await_holding_lock`]: Now lints for `parking_lot::{Mutex, RwLock}`
  [#8419](https://github.com/rust-lang/rust-clippy/pull/8419)
* [`recursive_format_impl`]: Now checks for format calls on `self`
  [#8188](https://github.com/rust-lang/rust-clippy/pull/8188)

### False Positive Fixes

* [`new_without_default`]: No longer lints for `new()` methods with `#[doc(hidden)]`
  [#8472](https://github.com/rust-lang/rust-clippy/pull/8472)
* [`transmute_undefined_repr`]: No longer lints for single field structs with `#[repr(C)]`,
  generic parameters, wide pointers, unions, tuples and allow several forms of type erasure
  [#8425](https://github.com/rust-lang/rust-clippy/pull/8425)
  [#8553](https://github.com/rust-lang/rust-clippy/pull/8553)
  [#8440](https://github.com/rust-lang/rust-clippy/pull/8440)
  [#8547](https://github.com/rust-lang/rust-clippy/pull/8547)
* [`match_single_binding`], [`match_same_arms`], [`match_as_ref`], [`match_bool`]: No longer
  lint `match` expressions with `cfg`ed arms
  [#8443](https://github.com/rust-lang/rust-clippy/pull/8443)
* [`single_component_path_imports`]: No longer lint on macros
  [#8537](https://github.com/rust-lang/rust-clippy/pull/8537)
* [`ptr_arg`]: Allow `&mut` arguments for `Cow<_>`
  [#8552](https://github.com/rust-lang/rust-clippy/pull/8552)
* [`needless_borrow`]: No longer lints for method calls
  [#8441](https://github.com/rust-lang/rust-clippy/pull/8441)
* [`match_same_arms`]: Now ensures that interposing arm patterns don't overlap
  [#8232](https://github.com/rust-lang/rust-clippy/pull/8232)
* [`default_trait_access`]: Now allows `Default::default` in update expressions
  [#8433](https://github.com/rust-lang/rust-clippy/pull/8433)

### Suggestion Fixes/Improvements

* [`redundant_slicing`]: Fixed suggestion for a method calls
  [#8218](https://github.com/rust-lang/rust-clippy/pull/8218)
* [`map_flatten`]: Long suggestions will now be split up into two help messages
  [#8520](https://github.com/rust-lang/rust-clippy/pull/8520)
* [`unnecessary_lazy_evaluations`]: Now shows suggestions for longer code snippets
  [#8543](https://github.com/rust-lang/rust-clippy/pull/8543)
* [`unnecessary_sort_by`]: Now suggests `Reverse` including the path
  [#8462](https://github.com/rust-lang/rust-clippy/pull/8462)
* [`search_is_some`]: More suggestions are now `MachineApplicable`
  [#8536](https://github.com/rust-lang/rust-clippy/pull/8536)

### Documentation Improvements

* [`new_without_default`]: Document `pub` requirement for the struct and fields
  [#8429](https://github.com/rust-lang/rust-clippy/pull/8429)

## Rust 1.60

Released 2022-04-07

[0eff589...57b3c4b](https://github.com/rust-lang/rust-clippy/compare/0eff589...57b3c4b)

### New Lints

* [`single_char_lifetime_names`]
  [#8236](https://github.com/rust-lang/rust-clippy/pull/8236)
* [`iter_overeager_cloned`]
  [#8203](https://github.com/rust-lang/rust-clippy/pull/8203)
* [`transmute_undefined_repr`]
  [#8398](https://github.com/rust-lang/rust-clippy/pull/8398)
* [`default_union_representation`]
  [#8289](https://github.com/rust-lang/rust-clippy/pull/8289)
* [`manual_bits`]
  [#8213](https://github.com/rust-lang/rust-clippy/pull/8213)
* [`borrow_as_ptr`]
  [#8210](https://github.com/rust-lang/rust-clippy/pull/8210)

### Moves and Deprecations

* Moved [`disallowed_methods`] and [`disallowed_types`] to `style` (now warn-by-default)
  [#8261](https://github.com/rust-lang/rust-clippy/pull/8261)
* Rename `ref_in_deref` to [`needless_borrow`]
  [#8217](https://github.com/rust-lang/rust-clippy/pull/8217)
* Moved [`mutex_atomic`] to `nursery` (now allow-by-default)
  [#8260](https://github.com/rust-lang/rust-clippy/pull/8260)

### Enhancements

* [`ptr_arg`]: Now takes the argument usage into account and lints for mutable references
  [#8271](https://github.com/rust-lang/rust-clippy/pull/8271)
* [`unused_io_amount`]: Now supports async read and write traits
  [#8179](https://github.com/rust-lang/rust-clippy/pull/8179)
* [`while_let_on_iterator`]: Improved detection to catch more cases
  [#8221](https://github.com/rust-lang/rust-clippy/pull/8221)
* [`trait_duplication_in_bounds`]: Now covers trait functions with `Self` bounds
  [#8252](https://github.com/rust-lang/rust-clippy/pull/8252)
* [`unwrap_used`]: Now works for `.get(i).unwrap()` and `.get_mut(i).unwrap()`
  [#8372](https://github.com/rust-lang/rust-clippy/pull/8372)
* [`map_clone`]: The suggestion takes `msrv` into account
  [#8280](https://github.com/rust-lang/rust-clippy/pull/8280)
* [`manual_bits`] and [`borrow_as_ptr`]: Now track the `clippy::msrv` attribute
  [#8280](https://github.com/rust-lang/rust-clippy/pull/8280)
* [`disallowed_methods`]: Now works for methods on primitive types
  [#8112](https://github.com/rust-lang/rust-clippy/pull/8112)
* [`not_unsafe_ptr_arg_deref`]: Now works for type aliases
  [#8273](https://github.com/rust-lang/rust-clippy/pull/8273)
* [`needless_question_mark`]: Now works for async functions
  [#8311](https://github.com/rust-lang/rust-clippy/pull/8311)
* [`iter_not_returning_iterator`]: Now handles type projections
  [#8228](https://github.com/rust-lang/rust-clippy/pull/8228)
* [`wrong_self_convention`]: Now detects wrong `self` references in more cases
  [#8208](https://github.com/rust-lang/rust-clippy/pull/8208)
* [`single_match`]: Now works for `match` statements with tuples
  [#8322](https://github.com/rust-lang/rust-clippy/pull/8322)

### False Positive Fixes

* [`erasing_op`]: No longer triggers if the output type changes
  [#8204](https://github.com/rust-lang/rust-clippy/pull/8204)
* [`if_same_then_else`]: No longer triggers for `if let` statements
  [#8297](https://github.com/rust-lang/rust-clippy/pull/8297)
* [`manual_memcpy`]: No longer lints on `VecDeque`
  [#8226](https://github.com/rust-lang/rust-clippy/pull/8226)
* [`trait_duplication_in_bounds`]: Now takes path segments into account
  [#8315](https://github.com/rust-lang/rust-clippy/pull/8315)
* [`deref_addrof`]: No longer lints when the dereference or borrow occurs in different a context
  [#8268](https://github.com/rust-lang/rust-clippy/pull/8268)
* [`type_repetition_in_bounds`]: Now checks for full equality to prevent false positives
  [#8224](https://github.com/rust-lang/rust-clippy/pull/8224)
* [`ptr_arg`]: No longer lint for mutable references in traits
  [#8369](https://github.com/rust-lang/rust-clippy/pull/8369)
* [`implicit_clone`]: No longer lints for double references
  [#8231](https://github.com/rust-lang/rust-clippy/pull/8231)
* [`needless_lifetimes`]: No longer lints lifetimes for explicit `self` types
  [#8278](https://github.com/rust-lang/rust-clippy/pull/8278)
* [`op_ref`]: No longer lints in `BinOp` impl if that can cause recursion
  [#8298](https://github.com/rust-lang/rust-clippy/pull/8298)
* [`enum_variant_names`]: No longer triggers for empty variant names
  [#8329](https://github.com/rust-lang/rust-clippy/pull/8329)
* [`redundant_closure`]: No longer lints for `Arc<T>` or `Rc<T>`
  [#8193](https://github.com/rust-lang/rust-clippy/pull/8193)
* [`iter_not_returning_iterator`]: No longer lints on trait implementations but therefore on trait definitions
  [#8228](https://github.com/rust-lang/rust-clippy/pull/8228)
* [`single_match`]: No longer lints on exhaustive enum patterns without a wildcard
  [#8322](https://github.com/rust-lang/rust-clippy/pull/8322)
* [`manual_swap`]: No longer lints on cases that involve automatic dereferences
  [#8220](https://github.com/rust-lang/rust-clippy/pull/8220)
* [`useless_format`]: Now works for implicit named arguments
  [#8295](https://github.com/rust-lang/rust-clippy/pull/8295)

### Suggestion Fixes/Improvements

* [`needless_borrow`]: Prevent mutable borrows being moved and suggest removing the borrow on method calls
  [#8217](https://github.com/rust-lang/rust-clippy/pull/8217)
* [`chars_next_cmp`]: Correctly escapes the suggestion
  [#8376](https://github.com/rust-lang/rust-clippy/pull/8376)
* [`explicit_write`]: Add suggestions for `write!`s with format arguments
  [#8365](https://github.com/rust-lang/rust-clippy/pull/8365)
* [`manual_memcpy`]: Suggests `copy_from_slice` when applicable
  [#8226](https://github.com/rust-lang/rust-clippy/pull/8226)
* [`or_fun_call`]: Improved suggestion display for long arguments
  [#8292](https://github.com/rust-lang/rust-clippy/pull/8292)
* [`unnecessary_cast`]: Now correctly includes the sign
  [#8350](https://github.com/rust-lang/rust-clippy/pull/8350)
* [`cmp_owned`]: No longer flips the comparison order
  [#8299](https://github.com/rust-lang/rust-clippy/pull/8299)
* [`explicit_counter_loop`]: Now correctly suggests `iter()` on references
  [#8382](https://github.com/rust-lang/rust-clippy/pull/8382)

### ICE Fixes

* [`manual_split_once`]
  [#8250](https://github.com/rust-lang/rust-clippy/pull/8250)

### Documentation Improvements

* [`map_flatten`]: Add documentation for the `Option` type
  [#8354](https://github.com/rust-lang/rust-clippy/pull/8354)
* Document that Clippy's driver might use a different code generation than rustc
  [#8037](https://github.com/rust-lang/rust-clippy/pull/8037)
* Clippy's lint list will now automatically focus the search box
  [#8343](https://github.com/rust-lang/rust-clippy/pull/8343)

### Others

* Clippy now warns if we find multiple Clippy config files exist
  [#8326](https://github.com/rust-lang/rust-clippy/pull/8326)

## Rust 1.59

Released 2022-02-24

[e181011...0eff589](https://github.com/rust-lang/rust-clippy/compare/e181011...0eff589)

### New Lints

* [`index_refutable_slice`]
  [#7643](https://github.com/rust-lang/rust-clippy/pull/7643)
* [`needless_splitn`]
  [#7896](https://github.com/rust-lang/rust-clippy/pull/7896)
* [`unnecessary_to_owned`]
  [#7978](https://github.com/rust-lang/rust-clippy/pull/7978)
* [`needless_late_init`]
  [#7995](https://github.com/rust-lang/rust-clippy/pull/7995)
* [`octal_escapes`] [#8007](https://github.com/rust-lang/rust-clippy/pull/8007)
* [`return_self_not_must_use`]
  [#8071](https://github.com/rust-lang/rust-clippy/pull/8071)
* [`init_numbered_fields`]
  [#8170](https://github.com/rust-lang/rust-clippy/pull/8170)

### Moves and Deprecations

* Move `if_then_panic` to `pedantic` and rename to [`manual_assert`] (now
  allow-by-default) [#7810](https://github.com/rust-lang/rust-clippy/pull/7810)
* Rename `disallow_type` to [`disallowed_types`] and `disallowed_method` to
  [`disallowed_methods`]
  [#7984](https://github.com/rust-lang/rust-clippy/pull/7984)
* Move [`map_flatten`] to `complexity` (now warn-by-default)
  [#8054](https://github.com/rust-lang/rust-clippy/pull/8054)

### Enhancements

* [`match_overlapping_arm`]: Fix false negative where after included ranges,
  overlapping ranges weren't linted anymore
  [#7909](https://github.com/rust-lang/rust-clippy/pull/7909)
* [`deprecated_cfg_attr`]: Now takes the specified MSRV into account
  [#7944](https://github.com/rust-lang/rust-clippy/pull/7944)
* [`cast_lossless`]: Now also lints for `bool` to integer casts
  [#7948](https://github.com/rust-lang/rust-clippy/pull/7948)
* [`let_underscore_lock`]: Also emit lints for the `parking_lot` crate
  [#7957](https://github.com/rust-lang/rust-clippy/pull/7957)
* [`needless_borrow`]
  [#7977](https://github.com/rust-lang/rust-clippy/pull/7977)
    * Lint when a borrow is auto-dereffed more than once
    * Lint in the trailing expression of a block for a match arm
* [`strlen_on_c_strings`]
  [8001](https://github.com/rust-lang/rust-clippy/pull/8001)
    * Lint when used without a fully-qualified path
    * Suggest removing the surrounding unsafe block when possible
* [`non_ascii_literal`]: Now also lints on `char`s, not just `string`s
  [#8034](https://github.com/rust-lang/rust-clippy/pull/8034)
* [`single_char_pattern`]: Now also lints on `split_inclusive`, `split_once`,
  `rsplit_once`, `replace`, and `replacen`
  [#8077](https://github.com/rust-lang/rust-clippy/pull/8077)
* [`unwrap_or_else_default`]: Now also lints on `std` constructors like
  `Vec::new`, `HashSet::new`, and `HashMap::new`
  [#8163](https://github.com/rust-lang/rust-clippy/pull/8163)
* [`shadow_reuse`]: Now also lints on shadowed `if let` bindings, instead of
  [`shadow_unrelated`]
  [#8165](https://github.com/rust-lang/rust-clippy/pull/8165)

### False Positive Fixes

* [`or_fun_call`], [`unnecessary_lazy_evaluations`]: Improve heuristics, so that
  cheap functions (e.g. calling `.len()` on a `Vec`) won't get linted anymore
  [#7639](https://github.com/rust-lang/rust-clippy/pull/7639)
* [`manual_split_once`]: No longer suggests code changing the original behavior
  [#7896](https://github.com/rust-lang/rust-clippy/pull/7896)
* Don't show [`no_effect`] or [`unnecessary_operation`] warning for unit struct
  implementing `FnOnce`
  [#7898](https://github.com/rust-lang/rust-clippy/pull/7898)
* [`semicolon_if_nothing_returned`]: Fixed a bug, where the lint wrongly
  triggered on `let-else` statements
  [#7955](https://github.com/rust-lang/rust-clippy/pull/7955)
* [`if_then_some_else_none`]: No longer lints if there is an early return
  [#7980](https://github.com/rust-lang/rust-clippy/pull/7980)
* [`needless_collect`]: No longer suggests removal of `collect` when removal
  would create code requiring mutably borrowing a value multiple times
  [#7982](https://github.com/rust-lang/rust-clippy/pull/7982)
* [`shadow_same`]: Fix false positive for `async` function's params
  [#7997](https://github.com/rust-lang/rust-clippy/pull/7997)
* [`suboptimal_flops`]: No longer triggers in constant functions
  [#8009](https://github.com/rust-lang/rust-clippy/pull/8009)
* [`type_complexity`]: No longer lints on associated types in traits
  [#8030](https://github.com/rust-lang/rust-clippy/pull/8030)
* [`question_mark`]: No longer lints if returned object is not local
  [#8080](https://github.com/rust-lang/rust-clippy/pull/8080)
* [`option_if_let_else`]: No longer lint on complex sub-patterns
  [#8086](https://github.com/rust-lang/rust-clippy/pull/8086)
* [`blocks_in_if_conditions`]: No longer lints on empty closures
  [#8100](https://github.com/rust-lang/rust-clippy/pull/8100)
* [`enum_variant_names`]: No longer lint when first prefix is only a substring
  of a camel-case word
  [#8127](https://github.com/rust-lang/rust-clippy/pull/8127)
* [`identity_op`]: Only lint on integral operands
  [#8183](https://github.com/rust-lang/rust-clippy/pull/8183)

### Suggestion Fixes/Improvements

* [`search_is_some`]: Fix suggestion for `any()` not taking item by reference
  [#7463](https://github.com/rust-lang/rust-clippy/pull/7463)
* [`almost_swapped`]: Now detects if there is a `no_std` or `no_core` attribute
  and adapts the suggestion accordingly
  [#7877](https://github.com/rust-lang/rust-clippy/pull/7877)
* [`redundant_pattern_matching`]: Fix suggestion for deref expressions
  [#7949](https://github.com/rust-lang/rust-clippy/pull/7949)
* [`explicit_counter_loop`]: Now also produces a suggestion for non-`usize`
  types [#7950](https://github.com/rust-lang/rust-clippy/pull/7950)
* [`manual_map`]: Fix suggestion when used with unsafe functions and blocks
  [#7968](https://github.com/rust-lang/rust-clippy/pull/7968)
* [`option_map_or_none`]: Suggest `map` over `and_then` when possible
  [#7971](https://github.com/rust-lang/rust-clippy/pull/7971)
* [`option_if_let_else`]: No longer expands macros in the suggestion
  [#7974](https://github.com/rust-lang/rust-clippy/pull/7974)
* [`iter_cloned_collect`]: Suggest `copied` over `cloned` when possible
  [#8006](https://github.com/rust-lang/rust-clippy/pull/8006)
* [`doc_markdown`]: No longer uses inline hints to improve readability of
  suggestion [#8011](https://github.com/rust-lang/rust-clippy/pull/8011)
* [`needless_question_mark`]: Now better explains the suggestion
  [#8028](https://github.com/rust-lang/rust-clippy/pull/8028)
* [`single_char_pattern`]: Escape backslash `\` in suggestion
  [#8067](https://github.com/rust-lang/rust-clippy/pull/8067)
* [`needless_bool`]: Suggest `a != b` over `!(a == b)`
  [#8117](https://github.com/rust-lang/rust-clippy/pull/8117)
* [`iter_skip_next`]: Suggest to add a `mut` if it is necessary in order to
  apply this lints suggestion
  [#8133](https://github.com/rust-lang/rust-clippy/pull/8133)
* [`neg_multiply`]: Now produces a suggestion
  [#8144](https://github.com/rust-lang/rust-clippy/pull/8144)
* [`needless_return`]: Now suggests the unit type `()` over an empty block `{}`
  in match arms [#8185](https://github.com/rust-lang/rust-clippy/pull/8185)
* [`suboptimal_flops`]: Now gives a syntactically correct suggestion for
  `to_radians` and `to_degrees`
  [#8187](https://github.com/rust-lang/rust-clippy/pull/8187)

### ICE Fixes

* [`undocumented_unsafe_blocks`]
  [#7945](https://github.com/rust-lang/rust-clippy/pull/7945)
  [#7988](https://github.com/rust-lang/rust-clippy/pull/7988)
* [`unnecessary_cast`]
  [#8167](https://github.com/rust-lang/rust-clippy/pull/8167)

### Documentation Improvements

* [`print_stdout`], [`print_stderr`], [`dbg_macro`]: Document how the lint level
  can be changed crate-wide
  [#8040](https://github.com/rust-lang/rust-clippy/pull/8040)
* Added a note to the `README` that config changes don't apply to already
  compiled code [#8175](https://github.com/rust-lang/rust-clippy/pull/8175)

### Others

* [Clippy's lint
  list](https://rust-lang.github.io/rust-clippy/master/index.html) now displays
  the version a lint was added. :tada:
  [#7813](https://github.com/rust-lang/rust-clippy/pull/7813)
* New and improved issue templates
  [#8032](https://github.com/rust-lang/rust-clippy/pull/8032)
* _Dev:_ Add `cargo dev lint` command, to run your modified Clippy version on a
  file [#7917](https://github.com/rust-lang/rust-clippy/pull/7917)

## Rust 1.58

Released 2022-01-13

[00e31fa...e181011](https://github.com/rust-lang/rust-clippy/compare/00e31fa...e181011)

### Rust 1.58.1

* Move [`non_send_fields_in_send_ty`] to `nursery` (now allow-by-default)
  [#8075](https://github.com/rust-lang/rust-clippy/pull/8075)
* [`useless_format`]: Handle implicit named arguments
  [#8295](https://github.com/rust-lang/rust-clippy/pull/8295)

### New lints

* [`transmute_num_to_bytes`]
  [#7805](https://github.com/rust-lang/rust-clippy/pull/7805)
* [`match_str_case_mismatch`]
  [#7806](https://github.com/rust-lang/rust-clippy/pull/7806)
* [`format_in_format_args`], [`to_string_in_format_args`]
  [#7743](https://github.com/rust-lang/rust-clippy/pull/7743)
* [`uninit_vec`]
  [#7682](https://github.com/rust-lang/rust-clippy/pull/7682)
* [`fn_to_numeric_cast_any`]
  [#7705](https://github.com/rust-lang/rust-clippy/pull/7705)
* [`undocumented_unsafe_blocks`]
  [#7748](https://github.com/rust-lang/rust-clippy/pull/7748)
* [`trailing_empty_array`]
  [#7838](https://github.com/rust-lang/rust-clippy/pull/7838)
* [`string_slice`]
  [#7878](https://github.com/rust-lang/rust-clippy/pull/7878)

### Moves or deprecations of lints

* Move [`non_send_fields_in_send_ty`] to `suspicious`
  [#7874](https://github.com/rust-lang/rust-clippy/pull/7874)
* Move [`non_ascii_literal`] to `restriction`
  [#7907](https://github.com/rust-lang/rust-clippy/pull/7907)

### Changes that expand what code existing lints cover

* [`question_mark`] now covers `Result`
  [#7840](https://github.com/rust-lang/rust-clippy/pull/7840)
* Make [`useless_format`] recognize bare `format!("")`
  [#7801](https://github.com/rust-lang/rust-clippy/pull/7801)
* Lint on underscored variables with no side effects in [`no_effect`]
  [#7775](https://github.com/rust-lang/rust-clippy/pull/7775)
* Expand [`match_ref_pats`] to check for multiple reference patterns
  [#7800](https://github.com/rust-lang/rust-clippy/pull/7800)

### False positive fixes

* Fix false positive of [`implicit_saturating_sub`] with `else` clause
  [#7832](https://github.com/rust-lang/rust-clippy/pull/7832)
* Fix [`question_mark`] when there is call in conditional predicate
  [#7860](https://github.com/rust-lang/rust-clippy/pull/7860)
* [`mut_mut`] no longer lints when type is defined in external macros
  [#7795](https://github.com/rust-lang/rust-clippy/pull/7795)
* Avoid [`eq_op`] in test functions
  [#7811](https://github.com/rust-lang/rust-clippy/pull/7811)
* [`cast_possible_truncation`] no longer lints when cast is coming from `signum`
  method call [#7850](https://github.com/rust-lang/rust-clippy/pull/7850)
* [`match_str_case_mismatch`] no longer lints on uncased characters
  [#7865](https://github.com/rust-lang/rust-clippy/pull/7865)
* [`ptr_arg`] no longer lints references to type aliases
  [#7890](https://github.com/rust-lang/rust-clippy/pull/7890)
* [`missing_safety_doc`] now also accepts "implementation safety" headers
  [#7856](https://github.com/rust-lang/rust-clippy/pull/7856)
* [`missing_safety_doc`] no longer lints if any parent has `#[doc(hidden)]`
  attribute [#7849](https://github.com/rust-lang/rust-clippy/pull/7849)
* [`if_not_else`] now ignores else-if statements
  [#7895](https://github.com/rust-lang/rust-clippy/pull/7895)
* Avoid linting [`cast_possible_truncation`] on bit-reducing operations
  [#7819](https://github.com/rust-lang/rust-clippy/pull/7819)
* Avoid linting [`field_reassign_with_default`] when `Drop` and `Copy` are
  involved [#7794](https://github.com/rust-lang/rust-clippy/pull/7794)
* [`unnecessary_sort_by`] now checks if argument implements `Ord` trait
  [#7824](https://github.com/rust-lang/rust-clippy/pull/7824)
* Fix false positive in [`match_overlapping_arm`]
  [#7847](https://github.com/rust-lang/rust-clippy/pull/7847)
* Prevent [`needless_lifetimes`] false positive in `async` function definition
  [#7901](https://github.com/rust-lang/rust-clippy/pull/7901)

### Suggestion fixes/improvements

* Keep an initial `::` when [`doc_markdown`] suggests to use ticks
  [#7916](https://github.com/rust-lang/rust-clippy/pull/7916)
* Add a machine applicable suggestion for the [`doc_markdown`] missing backticks
  lint [#7904](https://github.com/rust-lang/rust-clippy/pull/7904)
* [`equatable_if_let`] no longer expands macros in the suggestion
  [#7788](https://github.com/rust-lang/rust-clippy/pull/7788)
* Make [`shadow_reuse`] suggestion less verbose
  [#7782](https://github.com/rust-lang/rust-clippy/pull/7782)

### ICE fixes

* Fix ICE in [`enum_variant_names`]
  [#7873](https://github.com/rust-lang/rust-clippy/pull/7873)
* Fix ICE in [`undocumented_unsafe_blocks`]
  [#7891](https://github.com/rust-lang/rust-clippy/pull/7891)

### Documentation improvements

* Fixed naive doc formatting for `#[must_use]` lints ([`must_use_unit`],
  [`double_must_use`], [`must_use_candidate`], [`let_underscore_must_use`])
  [#7827](https://github.com/rust-lang/rust-clippy/pull/7827)
* Fix typo in example for [`match_result_ok`]
  [#7815](https://github.com/rust-lang/rust-clippy/pull/7815)

### Others

* Allow giving reasons for [`disallowed_types`]
  [#7791](https://github.com/rust-lang/rust-clippy/pull/7791)
* Fix [`manual_assert`] and [`match_wild_err_arm`] for `#![no_std]` and Rust
  2021. [#7851](https://github.com/rust-lang/rust-clippy/pull/7851)
* Fix regression in [`semicolon_if_nothing_returned`] on macros containing while
  loops [#7789](https://github.com/rust-lang/rust-clippy/pull/7789)
* Added a new configuration `literal-suffix-style` to enforce a certain style
  writing [`unseparated_literal_suffix`]
  [#7726](https://github.com/rust-lang/rust-clippy/pull/7726)

## Rust 1.57

Released 2021-12-02

[7bfc26e...00e31fa](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...00e31fa)

### New Lints

* [`negative_feature_names`]
  [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
* [`redundant_feature_names`]
  [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
* [`mod_module_files`]
  [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
* [`self_named_module_files`]
  [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
* [`manual_split_once`]
  [#7565](https://github.com/rust-lang/rust-clippy/pull/7565)
* [`derivable_impls`]
  [#7570](https://github.com/rust-lang/rust-clippy/pull/7570)
* [`needless_option_as_deref`]
  [#7596](https://github.com/rust-lang/rust-clippy/pull/7596)
* [`iter_not_returning_iterator`]
  [#7610](https://github.com/rust-lang/rust-clippy/pull/7610)
* [`same_name_method`]
  [#7653](https://github.com/rust-lang/rust-clippy/pull/7653)
* [`manual_assert`] [#7669](https://github.com/rust-lang/rust-clippy/pull/7669)
* [`non_send_fields_in_send_ty`]
  [#7709](https://github.com/rust-lang/rust-clippy/pull/7709)
* [`equatable_if_let`]
  [#7762](https://github.com/rust-lang/rust-clippy/pull/7762)

### Moves and Deprecations

* Move [`shadow_unrelated`] to `restriction`
  [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
* Move [`option_if_let_else`] to `nursery`
  [#7568](https://github.com/rust-lang/rust-clippy/pull/7568)
* Move [`branches_sharing_code`] to `nursery`
  [#7595](https://github.com/rust-lang/rust-clippy/pull/7595)
* Rename `if_let_some_result` to [`match_result_ok`] which now also handles
  `while let` cases [#7608](https://github.com/rust-lang/rust-clippy/pull/7608)
* Move [`many_single_char_names`] to `pedantic`
  [#7671](https://github.com/rust-lang/rust-clippy/pull/7671)
* Move [`float_cmp`] to `pedantic`
  [#7692](https://github.com/rust-lang/rust-clippy/pull/7692)
* Rename `box_vec` to [`box_collection`] and lint on more general cases
  [#7693](https://github.com/rust-lang/rust-clippy/pull/7693)
* Uplift `invalid_atomic_ordering` to rustc
  [rust-lang/rust#84039](https://github.com/rust-lang/rust/pull/84039)

### Enhancements

* Rewrite the `shadow*` lints, so that they find a lot more shadows and are not
  limited to certain patterns
  [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
* The `avoid-breaking-exported-api` configuration now also works for
  [`box_collection`], [`redundant_allocation`], [`rc_buffer`], [`vec_box`],
  [`option_option`], [`linkedlist`], [`rc_mutex`]
  [#7560](https://github.com/rust-lang/rust-clippy/pull/7560)
* [`unnecessary_unwrap`]: Now also checks for `expect`s
  [#7584](https://github.com/rust-lang/rust-clippy/pull/7584)
* [`disallowed_methods`]: Allow adding a reason that will be displayed with the
  lint message
  [#7621](https://github.com/rust-lang/rust-clippy/pull/7621)
* [`approx_constant`]: Now checks the MSRV for `LOG10_2` and `LOG2_10`
  [#7629](https://github.com/rust-lang/rust-clippy/pull/7629)
* [`approx_constant`]: Add `TAU`
  [#7642](https://github.com/rust-lang/rust-clippy/pull/7642)
* [`needless_borrow`]: Now also lints on needless mutable borrows
  [#7657](https://github.com/rust-lang/rust-clippy/pull/7657)
* [`missing_safety_doc`]: Now also lints on unsafe traits
  [#7734](https://github.com/rust-lang/rust-clippy/pull/7734)

### False Positive Fixes

* [`manual_map`]: No longer lints when the option is borrowed in the match and
  also consumed in the arm
  [#7531](https://github.com/rust-lang/rust-clippy/pull/7531)
* [`filter_next`]: No longer lints if `filter` method is not the
  `Iterator::filter` method
  [#7562](https://github.com/rust-lang/rust-clippy/pull/7562)
* [`manual_flatten`]: No longer lints if expression is used after `if let`
  [#7566](https://github.com/rust-lang/rust-clippy/pull/7566)
* [`option_if_let_else`]: Multiple fixes
  [#7573](https://github.com/rust-lang/rust-clippy/pull/7573)
    * `break` and `continue` statements local to the would-be closure are
      allowed
    * Don't lint in const contexts
    * Don't lint when yield expressions are used
    * Don't lint when the captures made by the would-be closure conflict with
      the other branch
    * Don't lint when a field of a local is used when the type could be
      potentially moved from
    * In some cases, don't lint when scrutinee expression conflicts with the
      captures of the would-be closure
* [`redundant_allocation`]: No longer lints on `Box<Box<dyn T>>` which replaces
  wide pointers with thin pointers
  [#7592](https://github.com/rust-lang/rust-clippy/pull/7592)
* [`bool_assert_comparison`]: No longer lints on types that do not implement the
  `Not` trait with `Output = bool`
  [#7605](https://github.com/rust-lang/rust-clippy/pull/7605)
* [`mut_range_bound`]: No longer lints on range bound mutations, that are
  immediately followed by a `break;`
  [#7607](https://github.com/rust-lang/rust-clippy/pull/7607)
* [`mutable_key_type`]: Improve accuracy and document remaining false positives
  and false negatives
  [#7640](https://github.com/rust-lang/rust-clippy/pull/7640)
* [`redundant_closure`]: Rewrite the lint to fix various false positives and
  false negatives [#7661](https://github.com/rust-lang/rust-clippy/pull/7661)
* [`large_enum_variant`]: No longer wrongly identifies the second largest
  variant [#7677](https://github.com/rust-lang/rust-clippy/pull/7677)
* [`needless_return`]: No longer lints on let-else expressions
  [#7685](https://github.com/rust-lang/rust-clippy/pull/7685)
* [`suspicious_else_formatting`]: No longer lints in proc-macros
  [#7707](https://github.com/rust-lang/rust-clippy/pull/7707)
* [`excessive_precision`]: No longer lints when in some cases the float was
  already written in the shortest form
  [#7722](https://github.com/rust-lang/rust-clippy/pull/7722)
* [`doc_markdown`]: No longer lints on intra-doc links
  [#7772](https://github.com/rust-lang/rust-clippy/pull/7772)

### Suggestion Fixes/Improvements

* [`unnecessary_operation`]: Recommend using an `assert!` instead of using a
  function call in an indexing operation
  [#7453](https://github.com/rust-lang/rust-clippy/pull/7453)
* [`manual_split_once`]: Produce semantically equivalent suggestion when
  `rsplitn` is used [#7663](https://github.com/rust-lang/rust-clippy/pull/7663)
* [`while_let_on_iterator`]: Produce correct suggestion when using `&mut`
  [#7690](https://github.com/rust-lang/rust-clippy/pull/7690)
* [`manual_assert`]: No better handles complex conditions
  [#7741](https://github.com/rust-lang/rust-clippy/pull/7741)
* Correctly handle signs in exponents in numeric literals lints
  [#7747](https://github.com/rust-lang/rust-clippy/pull/7747)
* [`suspicious_map`]: Now also suggests to use `inspect` as an alternative
  [#7770](https://github.com/rust-lang/rust-clippy/pull/7770)
* Drop exponent from suggestion if it is 0 in numeric literals lints
  [#7774](https://github.com/rust-lang/rust-clippy/pull/7774)

### ICE Fixes

* [`implicit_hasher`]
  [#7761](https://github.com/rust-lang/rust-clippy/pull/7761)

### Others

* Clippy now uses the 2021
  [Edition!](https://www.youtube.com/watch?v=q0aNduqb2Ro)
  [#7664](https://github.com/rust-lang/rust-clippy/pull/7664)

## Rust 1.56

Released 2021-10-21

[74d1561...7bfc26e](https://github.com/rust-lang/rust-clippy/compare/74d1561...7bfc26e)

### New Lints

* [`unwrap_or_else_default`]
  [#7516](https://github.com/rust-lang/rust-clippy/pull/7516)

### Enhancements

* [`needless_continue`]: Now also lints in `loop { continue; }` case
  [#7477](https://github.com/rust-lang/rust-clippy/pull/7477)
* [`disallowed_types`]: Now also primitive types can be disallowed
  [#7488](https://github.com/rust-lang/rust-clippy/pull/7488)
* [`manual_swap`]: Now also lints on xor swaps
  [#7506](https://github.com/rust-lang/rust-clippy/pull/7506)
* [`map_flatten`]: Now also lints on the `Result` type
  [#7522](https://github.com/rust-lang/rust-clippy/pull/7522)
* [`no_effect`]: Now also lints on inclusive ranges
  [#7556](https://github.com/rust-lang/rust-clippy/pull/7556)

### False Positive Fixes

* [`nonstandard_macro_braces`]: No longer lints on similar named nested macros
  [#7478](https://github.com/rust-lang/rust-clippy/pull/7478)
* [`too_many_lines`]: No longer lints in closures to avoid duplicated diagnostics
  [#7534](https://github.com/rust-lang/rust-clippy/pull/7534)
* [`similar_names`]: No longer complains about `iter` and `item` being too
  similar [#7546](https://github.com/rust-lang/rust-clippy/pull/7546)

### Suggestion Fixes/Improvements

* [`similar_names`]: No longer suggests to insert or add an underscore as a fix
  [#7221](https://github.com/rust-lang/rust-clippy/pull/7221)
* [`new_without_default`]: No longer shows the full qualified type path when
  suggesting adding a `Default` implementation
  [#7493](https://github.com/rust-lang/rust-clippy/pull/7493)
* [`while_let_on_iterator`]: Now suggests re-borrowing mutable references
  [#7520](https://github.com/rust-lang/rust-clippy/pull/7520)
* [`extend_with_drain`]: Improve code suggestion for mutable and immutable
  references [#7533](https://github.com/rust-lang/rust-clippy/pull/7533)
* [`trivially_copy_pass_by_ref`]: Now properly handles `Self` type
  [#7535](https://github.com/rust-lang/rust-clippy/pull/7535)
* [`never_loop`]: Now suggests using `if let` instead of a `for` loop when
  applicable [#7541](https://github.com/rust-lang/rust-clippy/pull/7541)

### Documentation Improvements

* Clippy now uses a lint to generate its lint documentation. [Lints all the way
  down](https://en.wikipedia.org/wiki/Turtles_all_the_way_down).
  [#7502](https://github.com/rust-lang/rust-clippy/pull/7502)
* Reworked Clippy's website:
  [#7172](https://github.com/rust-lang/rust-clippy/issues/7172)
  [#7279](https://github.com/rust-lang/rust-clippy/pull/7279)
  * Added applicability information about lints
  * Added a link to jump into the implementation
  * Improved loading times
  * Adapted some styling
* `cargo clippy --help` now also explains the `--fix` and `--no-deps` flag
  [#7492](https://github.com/rust-lang/rust-clippy/pull/7492)
* [`unnested_or_patterns`]: Removed `or_patterns` feature gate in the code
  example [#7507](https://github.com/rust-lang/rust-clippy/pull/7507)

## Rust 1.55

Released 2021-09-09

[3ae8faf...74d1561](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...74d1561)

### Important Changes

* Stabilized `cargo clippy --fix` :tada:
  [#7405](https://github.com/rust-lang/rust-clippy/pull/7405)

### New Lints

* [`rc_mutex`]
  [#7316](https://github.com/rust-lang/rust-clippy/pull/7316)
* [`nonstandard_macro_braces`]
  [#7299](https://github.com/rust-lang/rust-clippy/pull/7299)
* [`strlen_on_c_strings`]
  [#7243](https://github.com/rust-lang/rust-clippy/pull/7243)
* [`self_named_constructors`]
  [#7403](https://github.com/rust-lang/rust-clippy/pull/7403)
* [`disallowed_script_idents`]
  [#7400](https://github.com/rust-lang/rust-clippy/pull/7400)
* [`disallowed_types`]
  [#7315](https://github.com/rust-lang/rust-clippy/pull/7315)
* [`missing_enforced_import_renames`]
  [#7300](https://github.com/rust-lang/rust-clippy/pull/7300)
* [`extend_with_drain`]
  [#7270](https://github.com/rust-lang/rust-clippy/pull/7270)

### Moves and Deprecations

* Moved [`from_iter_instead_of_collect`] to `pedantic`
  [#7375](https://github.com/rust-lang/rust-clippy/pull/7375)
* Added `suspicious` as a new lint group for *code that is most likely wrong or useless*
  [#7350](https://github.com/rust-lang/rust-clippy/pull/7350)
  * Moved [`blanket_clippy_restriction_lints`] to `suspicious`
  * Moved [`empty_loop`] to `suspicious`
  * Moved [`eval_order_dependence`] to `suspicious`
  * Moved [`float_equality_without_abs`] to `suspicious`
  * Moved [`for_loops_over_fallibles`] to `suspicious`
  * Moved [`misrefactored_assign_op`] to `suspicious`
  * Moved [`mut_range_bound`] to `suspicious`
  * Moved [`mutable_key_type`] to `suspicious`
  * Moved [`suspicious_arithmetic_impl`] to `suspicious`
  * Moved [`suspicious_assignment_formatting`] to `suspicious`
  * Moved [`suspicious_else_formatting`] to `suspicious`
  * Moved [`suspicious_map`] to `suspicious`
  * Moved [`suspicious_op_assign_impl`] to `suspicious`
  * Moved [`suspicious_unary_op_formatting`] to `suspicious`

### Enhancements

* [`while_let_on_iterator`]: Now suggests `&mut iter` inside closures
  [#7262](https://github.com/rust-lang/rust-clippy/pull/7262)
* [`doc_markdown`]:
  * Now detects unbalanced ticks
    [#7357](https://github.com/rust-lang/rust-clippy/pull/7357)
  * Add `FreeBSD` to the default configuration as an allowed identifier
    [#7334](https://github.com/rust-lang/rust-clippy/pull/7334)
* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]: Now allows wildcards for enums with unstable
  or hidden variants
  [#7407](https://github.com/rust-lang/rust-clippy/pull/7407)
* [`redundant_allocation`]: Now additionally supports the `Arc<>` type
  [#7308](https://github.com/rust-lang/rust-clippy/pull/7308)
* [`disallowed_names`]: Now allows disallowed names in test code
  [#7379](https://github.com/rust-lang/rust-clippy/pull/7379)
* [`redundant_closure`]: Suggests `&mut` for `FnMut`
  [#7437](https://github.com/rust-lang/rust-clippy/pull/7437)
* [`disallowed_methods`], [`disallowed_types`]: The configuration values `disallowed-method` and `disallowed-type`
  no longer require fully qualified paths
  [#7345](https://github.com/rust-lang/rust-clippy/pull/7345)
* [`zst_offset`]: Fixed lint invocation after it was accidentally suppressed
  [#7396](https://github.com/rust-lang/rust-clippy/pull/7396)

### False Positive Fixes

* [`default_numeric_fallback`]: No longer lints on float literals as function arguments
  [#7446](https://github.com/rust-lang/rust-clippy/pull/7446)
* [`use_self`]: No longer lints on type parameters
  [#7288](https://github.com/rust-lang/rust-clippy/pull/7288)
* [`unimplemented`]: Now ignores the `assert` and `debug_assert` macros
  [#7439](https://github.com/rust-lang/rust-clippy/pull/7439)
* [`branches_sharing_code`]: Now always checks for block expressions
  [#7462](https://github.com/rust-lang/rust-clippy/pull/7462)
* [`field_reassign_with_default`]: No longer triggers in macros
  [#7160](https://github.com/rust-lang/rust-clippy/pull/7160)
* [`redundant_clone`]: No longer lints on required clones for borrowed data
  [#7346](https://github.com/rust-lang/rust-clippy/pull/7346)
* [`default_numeric_fallback`]: No longer triggers in external macros
  [#7325](https://github.com/rust-lang/rust-clippy/pull/7325)
* [`needless_bool`]: No longer lints in macros
  [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
* [`useless_format`]: No longer triggers when additional text is being appended
  [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
* [`assertions_on_constants`]: `cfg!(...)` is no longer considered to be a constant
  [#7319](https://github.com/rust-lang/rust-clippy/pull/7319)

### Suggestion Fixes/Improvements

* [`needless_collect`]: Now show correct lint messages for shadowed values
  [#7289](https://github.com/rust-lang/rust-clippy/pull/7289)
* [`wrong_pub_self_convention`]: The deprecated message now suggest the correct configuration value
  [#7382](https://github.com/rust-lang/rust-clippy/pull/7382)
* [`semicolon_if_nothing_returned`]: Allow missing semicolon in blocks with only one expression
  [#7326](https://github.com/rust-lang/rust-clippy/pull/7326)

### ICE Fixes

* [`zero_sized_map_values`]
  [#7470](https://github.com/rust-lang/rust-clippy/pull/7470)
* [`redundant_pattern_matching`]
  [#7471](https://github.com/rust-lang/rust-clippy/pull/7471)
* [`modulo_one`]
  [#7473](https://github.com/rust-lang/rust-clippy/pull/7473)
* [`use_self`]
  [#7428](https://github.com/rust-lang/rust-clippy/pull/7428)

## Rust 1.54

Released 2021-07-29

[7c7683c...3ae8faf](https://github.com/rust-lang/rust-clippy/compare/7c7683c...3ae8faf)

### New Lints

- [`ref_binding_to_reference`]
  [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
- [`needless_bitwise_bool`]
  [#7133](https://github.com/rust-lang/rust-clippy/pull/7133)
- [`unused_async`] [#7225](https://github.com/rust-lang/rust-clippy/pull/7225)
- [`manual_str_repeat`]
  [#7265](https://github.com/rust-lang/rust-clippy/pull/7265)
- [`suspicious_splitn`]
  [#7292](https://github.com/rust-lang/rust-clippy/pull/7292)

### Moves and Deprecations

- Deprecate `pub_enum_variant_names` and `wrong_pub_self_convention` in favor of
  the new `avoid-breaking-exported-api` config option (see
  [Enhancements](#1-54-enhancements))
  [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
- Move [`inconsistent_struct_constructor`] to `pedantic`
  [#7193](https://github.com/rust-lang/rust-clippy/pull/7193)
- Move [`needless_borrow`] to `style` (now warn-by-default)
  [#7254](https://github.com/rust-lang/rust-clippy/pull/7254)
- Move [`suspicious_operation_groupings`] to `nursery`
  [#7266](https://github.com/rust-lang/rust-clippy/pull/7266)
- Move [`semicolon_if_nothing_returned`] to `pedantic`
  [#7268](https://github.com/rust-lang/rust-clippy/pull/7268)

### Enhancements <a name="1-54-enhancements"></a>

- [`while_let_on_iterator`]: Now also lints in nested loops
  [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
- [`single_char_pattern`]: Now also lints on `strip_prefix` and `strip_suffix`
  [#7156](https://github.com/rust-lang/rust-clippy/pull/7156)
- [`needless_collect`]: Now also lints on assignments with type annotations
  [#7163](https://github.com/rust-lang/rust-clippy/pull/7163)
- [`if_then_some_else_none`]: Now works with the MSRV config
  [#7177](https://github.com/rust-lang/rust-clippy/pull/7177)
- Add `avoid-breaking-exported-api` config option for the lints
  [`enum_variant_names`], [`large_types_passed_by_value`],
  [`trivially_copy_pass_by_ref`], [`unnecessary_wraps`],
  [`upper_case_acronyms`], and [`wrong_self_convention`]. We recommend to set
  this configuration option to `false` before a major release (1.0/2.0/...) to
  clean up the API [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
- [`needless_collect`]: Now lints on even more data structures
  [#7188](https://github.com/rust-lang/rust-clippy/pull/7188)
- [`missing_docs_in_private_items`]: No longer sees `#[<name> = "<value>"]` like
  attributes as sufficient documentation
  [#7281](https://github.com/rust-lang/rust-clippy/pull/7281)
- [`needless_collect`], [`short_circuit_statement`], [`unnecessary_operation`]:
  Now work as expected when used with `allow`
  [#7282](https://github.com/rust-lang/rust-clippy/pull/7282)

### False Positive Fixes

- [`implicit_return`]: Now takes all diverging functions in account to avoid
  false positives [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
- [`while_let_on_iterator`]: No longer lints when the iterator is a struct field
  and the struct is used in the loop
  [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
- [`multiple_inherent_impl`]: No longer lints with generic arguments
  [#7089](https://github.com/rust-lang/rust-clippy/pull/7089)
- [`comparison_chain`]: No longer lints in a `const` context
  [#7118](https://github.com/rust-lang/rust-clippy/pull/7118)
- [`while_immutable_condition`]: Fix false positive where mutation in the loop
  variable wasn't picked up
  [#7144](https://github.com/rust-lang/rust-clippy/pull/7144)
- [`default_trait_access`]: No longer lints in macros
  [#7150](https://github.com/rust-lang/rust-clippy/pull/7150)
- [`needless_question_mark`]: No longer lints when the inner value is implicitly
  dereferenced [#7165](https://github.com/rust-lang/rust-clippy/pull/7165)
- [`unused_unit`]: No longer lints when multiple macro contexts are involved
  [#7167](https://github.com/rust-lang/rust-clippy/pull/7167)
- [`eval_order_dependence`]: Fix false positive in async context
  [#7174](https://github.com/rust-lang/rust-clippy/pull/7174)
- [`unnecessary_filter_map`]: No longer lints if the `filter_map` changes the
  type [#7175](https://github.com/rust-lang/rust-clippy/pull/7175)
- [`wrong_self_convention`]: No longer lints in trait implementations of
  non-`Copy` types [#7182](https://github.com/rust-lang/rust-clippy/pull/7182)
- [`suboptimal_flops`]: No longer lints on `powi(2)`
  [#7201](https://github.com/rust-lang/rust-clippy/pull/7201)
- [`wrong_self_convention`]: No longer lints if there is no implicit `self`
  [#7215](https://github.com/rust-lang/rust-clippy/pull/7215)
- [`option_if_let_else`]: No longer lints on `else if let` pattern
  [#7216](https://github.com/rust-lang/rust-clippy/pull/7216)
- [`use_self`], [`useless_conversion`]: Fix false positives when generic
  arguments are involved
  [#7223](https://github.com/rust-lang/rust-clippy/pull/7223)
- [`manual_unwrap_or`]: Fix false positive with deref coercion
  [#7233](https://github.com/rust-lang/rust-clippy/pull/7233)
- [`similar_names`]: No longer lints on `wparam`/`lparam`
  [#7255](https://github.com/rust-lang/rust-clippy/pull/7255)
- [`redundant_closure`]: No longer lints on using the `vec![]` macro in a
  closure [#7263](https://github.com/rust-lang/rust-clippy/pull/7263)

### Suggestion Fixes/Improvements

- [`implicit_return`]
  [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
    - Fix suggestion for async functions
    - Improve suggestion with macros
    - Suggest to change `break` to `return` when appropriate
- [`while_let_on_iterator`]: Now suggests `&mut iter` when necessary
  [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
- [`match_single_binding`]: Improve suggestion when match scrutinee has side
  effects [#7095](https://github.com/rust-lang/rust-clippy/pull/7095)
- [`needless_borrow`]: Now suggests to also change usage sites as needed
  [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
- [`write_with_newline`]: Improve suggestion when only `\n` is written to the
  buffer [#7183](https://github.com/rust-lang/rust-clippy/pull/7183)
- [`from_iter_instead_of_collect`]: The suggestion is now auto applicable also
  when a `<_ as Trait>::_` is involved
  [#7264](https://github.com/rust-lang/rust-clippy/pull/7264)
- [`not_unsafe_ptr_arg_deref`]: Improved error message
  [#7294](https://github.com/rust-lang/rust-clippy/pull/7294)

### ICE Fixes

- Fix ICE when running Clippy on `libstd`
  [#7140](https://github.com/rust-lang/rust-clippy/pull/7140)
- [`implicit_return`]
  [#7242](https://github.com/rust-lang/rust-clippy/pull/7242)

## Rust 1.53

Released 2021-06-17

[6ed6f1e...7c7683c](https://github.com/rust-lang/rust-clippy/compare/6ed6f1e...7c7683c)

### New Lints

* [`option_filter_map`]
  [#6342](https://github.com/rust-lang/rust-clippy/pull/6342)
* [`branches_sharing_code`]
  [#6463](https://github.com/rust-lang/rust-clippy/pull/6463)
* [`needless_for_each`]
  [#6706](https://github.com/rust-lang/rust-clippy/pull/6706)
* [`if_then_some_else_none`]
  [#6859](https://github.com/rust-lang/rust-clippy/pull/6859)
* [`non_octal_unix_permissions`]
  [#7001](https://github.com/rust-lang/rust-clippy/pull/7001)
* [`unnecessary_self_imports`]
  [#7072](https://github.com/rust-lang/rust-clippy/pull/7072)
* [`bool_assert_comparison`]
  [#7083](https://github.com/rust-lang/rust-clippy/pull/7083)
* [`cloned_instead_of_copied`]
  [#7098](https://github.com/rust-lang/rust-clippy/pull/7098)
* [`flat_map_option`]
  [#7101](https://github.com/rust-lang/rust-clippy/pull/7101)

### Moves and Deprecations

* Deprecate [`filter_map`] lint
  [#7059](https://github.com/rust-lang/rust-clippy/pull/7059)
* Move [`transmute_ptr_to_ptr`] to `pedantic`
  [#7102](https://github.com/rust-lang/rust-clippy/pull/7102)

### Enhancements

* [`mem_replace_with_default`]: Also lint on common std constructors
  [#6820](https://github.com/rust-lang/rust-clippy/pull/6820)
* [`wrong_self_convention`]: Also lint on `to_*_mut` methods
  [#6828](https://github.com/rust-lang/rust-clippy/pull/6828)
* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]:
  [#6863](https://github.com/rust-lang/rust-clippy/pull/6863)
    * Attempt to find a common path prefix in suggestion
    * Don't lint on `Option` and `Result`
    * Consider `Self` prefix
* [`explicit_deref_methods`]: Also lint on chained `deref` calls
  [#6865](https://github.com/rust-lang/rust-clippy/pull/6865)
* [`or_fun_call`]: Also lint on `unsafe` blocks
  [#6928](https://github.com/rust-lang/rust-clippy/pull/6928)
* [`vec_box`], [`linkedlist`], [`option_option`]: Also lint in `const` and
  `static` items [#6938](https://github.com/rust-lang/rust-clippy/pull/6938)
* [`search_is_some`]: Also check for `is_none`
  [#6942](https://github.com/rust-lang/rust-clippy/pull/6942)
* [`string_lit_as_bytes`]: Also lint on `into_bytes`
  [#6959](https://github.com/rust-lang/rust-clippy/pull/6959)
* [`len_without_is_empty`]: Also lint if function signatures of `len` and
  `is_empty` don't match
  [#6980](https://github.com/rust-lang/rust-clippy/pull/6980)
* [`redundant_pattern_matching`]: Also lint if the pattern is a `&` pattern
  [#6991](https://github.com/rust-lang/rust-clippy/pull/6991)
* [`clone_on_copy`]: Also lint on chained method calls taking `self` by value
  [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
* [`missing_panics_doc`]: Also lint on `assert_eq!` and `assert_ne!`
  [#7029](https://github.com/rust-lang/rust-clippy/pull/7029)
* [`needless_return`]: Also lint in `async` functions
  [#7067](https://github.com/rust-lang/rust-clippy/pull/7067)
* [`unused_io_amount`]: Also lint on expressions like `_.read().ok()?`
  [#7100](https://github.com/rust-lang/rust-clippy/pull/7100)
* [`iter_cloned_collect`]: Also lint on large arrays, since const-generics are
  now stable [#7138](https://github.com/rust-lang/rust-clippy/pull/7138)

### False Positive Fixes

* [`upper_case_acronyms`]: No longer lints on public items
  [#6805](https://github.com/rust-lang/rust-clippy/pull/6805)
* [`suspicious_map`]: No longer lints when side effects may occur inside the
  `map` call [#6831](https://github.com/rust-lang/rust-clippy/pull/6831)
* [`manual_map`], [`manual_unwrap_or`]: No longer lints in `const` functions
  [#6917](https://github.com/rust-lang/rust-clippy/pull/6917)
* [`wrong_self_convention`]: Now respects `Copy` types
  [#6924](https://github.com/rust-lang/rust-clippy/pull/6924)
* [`needless_question_mark`]: No longer lints if the `?` and the `Some(..)` come
  from different macro contexts [#6935](https://github.com/rust-lang/rust-clippy/pull/6935)
* [`map_entry`]: Better detect if the entry API can be used
  [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
* [`or_fun_call`]: No longer lints on some `len` function calls
  [#6950](https://github.com/rust-lang/rust-clippy/pull/6950)
* [`new_ret_no_self`]: No longer lints when `Self` is returned with different
  generic arguments [#6952](https://github.com/rust-lang/rust-clippy/pull/6952)
* [`upper_case_acronyms`]: No longer lints on public items
  [#6981](https://github.com/rust-lang/rust-clippy/pull/6981)
* [`explicit_into_iter_loop`]: Only lint when `into_iter` is an implementation
  of `IntoIterator` [#6982](https://github.com/rust-lang/rust-clippy/pull/6982)
* [`expl_impl_clone_on_copy`]: Take generic constraints into account before
  suggesting to use `derive` instead
  [#6993](https://github.com/rust-lang/rust-clippy/pull/6993)
* [`missing_panics_doc`]: No longer lints when only debug-assertions are used
  [#6996](https://github.com/rust-lang/rust-clippy/pull/6996)
* [`clone_on_copy`]: Only lint when using the `Clone` trait
  [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
* [`wrong_self_convention`]: No longer lints inside a trait implementation
  [#7002](https://github.com/rust-lang/rust-clippy/pull/7002)
* [`redundant_clone`]: No longer lints when the cloned value is modified while
  the clone is in use
  [#7011](https://github.com/rust-lang/rust-clippy/pull/7011)
* [`same_item_push`]: No longer lints if the `Vec` is used in the loop body
  [#7018](https://github.com/rust-lang/rust-clippy/pull/7018)
* [`cargo_common_metadata`]: Remove author requirement
  [#7026](https://github.com/rust-lang/rust-clippy/pull/7026)
* [`panic_in_result_fn`]: No longer lints on `debug_assert` family
  [#7060](https://github.com/rust-lang/rust-clippy/pull/7060)
* [`panic`]: No longer wrongfully lints on `debug_assert` with message
  [#7063](https://github.com/rust-lang/rust-clippy/pull/7063)
* [`wrong_self_convention`]: No longer lints in trait implementations where no
  `self` is involved [#7064](https://github.com/rust-lang/rust-clippy/pull/7064)
* [`missing_const_for_fn`]: No longer lints when unstable `const` function is
  involved [#7076](https://github.com/rust-lang/rust-clippy/pull/7076)
* [`suspicious_else_formatting`]: Allow Allman style braces
  [#7087](https://github.com/rust-lang/rust-clippy/pull/7087)
* [`inconsistent_struct_constructor`]: No longer lints in macros
  [#7097](https://github.com/rust-lang/rust-clippy/pull/7097)
* [`single_component_path_imports`]: No longer lints on macro re-exports
  [#7120](https://github.com/rust-lang/rust-clippy/pull/7120)

### Suggestion Fixes/Improvements

* [`redundant_pattern_matching`]: Add a note when applying this lint would
  change the drop order
  [#6568](https://github.com/rust-lang/rust-clippy/pull/6568)
* [`write_literal`], [`print_literal`]: Add auto-applicable suggestion
  [#6821](https://github.com/rust-lang/rust-clippy/pull/6821)
* [`manual_map`]: Fix suggestion for complex `if let ... else` chains
  [#6856](https://github.com/rust-lang/rust-clippy/pull/6856)
* [`inconsistent_struct_constructor`]: Make lint description and message clearer
  [#6892](https://github.com/rust-lang/rust-clippy/pull/6892)
* [`map_entry`]: Now suggests `or_insert`, `insert_with` or `match _.entry(_)`
  as appropriate [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
* [`manual_flatten`]: Suggest to insert `copied` if necessary
  [#6962](https://github.com/rust-lang/rust-clippy/pull/6962)
* [`redundant_slicing`]: Fix suggestion when a re-borrow might be required or
  when the value is from a macro call
  [#6975](https://github.com/rust-lang/rust-clippy/pull/6975)
* [`match_wildcard_for_single_variants`]: Fix suggestion for hidden variant
  [#6988](https://github.com/rust-lang/rust-clippy/pull/6988)
* [`clone_on_copy`]: Correct suggestion when the cloned value is a macro call
  [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
* [`manual_map`]: Fix suggestion at the end of an if chain
  [#7004](https://github.com/rust-lang/rust-clippy/pull/7004)
* Fix needless parenthesis output in multiple lint suggestions
  [#7013](https://github.com/rust-lang/rust-clippy/pull/7013)
* [`needless_collect`]: Better explanation in the lint message
  [#7020](https://github.com/rust-lang/rust-clippy/pull/7020)
* [`useless_vec`]: Now considers mutability
  [#7036](https://github.com/rust-lang/rust-clippy/pull/7036)
* [`useless_format`]: Wrap the content in braces if necessary
  [#7092](https://github.com/rust-lang/rust-clippy/pull/7092)
* [`single_match`]: Don't suggest an equality check for types which don't
  implement `PartialEq`
  [#7093](https://github.com/rust-lang/rust-clippy/pull/7093)
* [`from_over_into`]: Mention type in help message
  [#7099](https://github.com/rust-lang/rust-clippy/pull/7099)
* [`manual_unwrap_or`]: Fix invalid code suggestion due to a macro call
  [#7136](https://github.com/rust-lang/rust-clippy/pull/7136)

### ICE Fixes

* [`macro_use_imports`]
  [#7022](https://github.com/rust-lang/rust-clippy/pull/7022)
* [`missing_panics_doc`]
  [#7034](https://github.com/rust-lang/rust-clippy/pull/7034)
* [`tabs_in_doc_comments`]
  [#7039](https://github.com/rust-lang/rust-clippy/pull/7039)
* [`missing_const_for_fn`]
  [#7128](https://github.com/rust-lang/rust-clippy/pull/7128)

### Others

* [Clippy's lint
  list](https://rust-lang.github.io/rust-clippy/master/index.html) now supports
  themes [#7030](https://github.com/rust-lang/rust-clippy/pull/7030)
* Lints that were uplifted to `rustc` now mention the new `rustc` name in the
  deprecation warning
  [#7056](https://github.com/rust-lang/rust-clippy/pull/7056)

## Rust 1.52

Released 2021-05-06

[3e41797...6ed6f1e](https://github.com/rust-lang/rust-clippy/compare/3e41797...6ed6f1e)

### New Lints

* [`from_str_radix_10`]
  [#6717](https://github.com/rust-lang/rust-clippy/pull/6717)
* [`implicit_clone`]
  [#6730](https://github.com/rust-lang/rust-clippy/pull/6730)
* [`semicolon_if_nothing_returned`]
  [#6681](https://github.com/rust-lang/rust-clippy/pull/6681)
* [`manual_flatten`]
  [#6646](https://github.com/rust-lang/rust-clippy/pull/6646)
* [`inconsistent_struct_constructor`]
  [#6769](https://github.com/rust-lang/rust-clippy/pull/6769)
* [`iter_count`]
  [#6791](https://github.com/rust-lang/rust-clippy/pull/6791)
* [`default_numeric_fallback`]
  [#6662](https://github.com/rust-lang/rust-clippy/pull/6662)
* [`bytes_nth`]
  [#6695](https://github.com/rust-lang/rust-clippy/pull/6695)
* [`filter_map_identity`]
  [#6685](https://github.com/rust-lang/rust-clippy/pull/6685)
* [`manual_map`]
  [#6573](https://github.com/rust-lang/rust-clippy/pull/6573)

### Moves and Deprecations

* Moved [`upper_case_acronyms`] to `pedantic`
  [#6775](https://github.com/rust-lang/rust-clippy/pull/6775)
* Moved [`manual_map`] to `nursery`
  [#6796](https://github.com/rust-lang/rust-clippy/pull/6796)
* Moved [`unnecessary_wraps`] to `pedantic`
  [#6765](https://github.com/rust-lang/rust-clippy/pull/6765)
* Moved [`trivial_regex`] to `nursery`
  [#6696](https://github.com/rust-lang/rust-clippy/pull/6696)
* Moved [`naive_bytecount`] to `pedantic`
  [#6825](https://github.com/rust-lang/rust-clippy/pull/6825)
* Moved [`upper_case_acronyms`] to `style`
  [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
* Moved [`manual_map`] to `style`
  [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)

### Enhancements

* [`disallowed_methods`]: Now supports functions in addition to methods
  [#6674](https://github.com/rust-lang/rust-clippy/pull/6674)
* [`upper_case_acronyms`]: Added a new configuration `upper-case-acronyms-aggressive` to
  trigger the lint if there is more than one uppercase character next to each other
  [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
* [`collapsible_match`]: Now supports block comparison with different value names
  [#6754](https://github.com/rust-lang/rust-clippy/pull/6754)
* [`unnecessary_wraps`]: Will now suggest removing unnecessary wrapped return unit type, like `Option<()>`
  [#6665](https://github.com/rust-lang/rust-clippy/pull/6665)
* Improved value usage detection in closures
  [#6698](https://github.com/rust-lang/rust-clippy/pull/6698)

### False Positive Fixes

* [`use_self`]: No longer lints in macros
  [#6833](https://github.com/rust-lang/rust-clippy/pull/6833)
* [`use_self`]: Fixed multiple false positives for: generics, associated types and derive implementations
  [#6179](https://github.com/rust-lang/rust-clippy/pull/6179)
* [`missing_inline_in_public_items`]: No longer lints for procedural macros
  [#6814](https://github.com/rust-lang/rust-clippy/pull/6814)
* [`inherent_to_string`]: No longer lints on functions with function generics
  [#6771](https://github.com/rust-lang/rust-clippy/pull/6771)
* [`doc_markdown`]: Add `OpenDNS` to the default configuration as an allowed identifier
  [#6783](https://github.com/rust-lang/rust-clippy/pull/6783)
* [`missing_panics_doc`]: No longer lints on [`unreachable!`](https://doc.rust-lang.org/std/macro.unreachable.html)
  [#6700](https://github.com/rust-lang/rust-clippy/pull/6700)
* [`collapsible_if`]: No longer lints on if statements with attributes
  [#6701](https://github.com/rust-lang/rust-clippy/pull/6701)
* [`match_same_arms`]: Only considers empty blocks as equal if the tokens contained are the same
  [#6843](https://github.com/rust-lang/rust-clippy/pull/6843)
* [`redundant_closure`]: Now ignores macros
  [#6871](https://github.com/rust-lang/rust-clippy/pull/6871)
* [`manual_map`]: Fixed false positives when control flow statements like `return`, `break` etc. are used
  [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
* [`vec_init_then_push`]: Fixed false positives for loops and if statements
  [#6697](https://github.com/rust-lang/rust-clippy/pull/6697)
* [`len_without_is_empty`]: Will now consider multiple impl blocks and `#[allow]` on
  the `len` method as well as the type definition.
  [#6853](https://github.com/rust-lang/rust-clippy/pull/6853)
* [`let_underscore_drop`]: Only lints on types which implement `Drop`
  [#6682](https://github.com/rust-lang/rust-clippy/pull/6682)
* [`unit_arg`]: No longer lints on unit arguments when they come from a path expression.
  [#6601](https://github.com/rust-lang/rust-clippy/pull/6601)
* [`cargo_common_metadata`]: No longer lints if
  [`publish = false`](https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field)
  is defined in the manifest
  [#6650](https://github.com/rust-lang/rust-clippy/pull/6650)

### Suggestion Fixes/Improvements

* [`collapsible_match`]: Fixed lint message capitalization
  [#6766](https://github.com/rust-lang/rust-clippy/pull/6766)
* [`or_fun_call`]: Improved suggestions for `or_insert(vec![])`
  [#6790](https://github.com/rust-lang/rust-clippy/pull/6790)
* [`manual_map`]: No longer expands macros in the suggestions
  [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
* Aligned Clippy's lint messages with the rustc dev guide
  [#6787](https://github.com/rust-lang/rust-clippy/pull/6787)

### ICE Fixes

* [`zero_sized_map_values`]
  [#6866](https://github.com/rust-lang/rust-clippy/pull/6866)

### Documentation Improvements

* [`useless_format`]: Improved the documentation example
  [#6854](https://github.com/rust-lang/rust-clippy/pull/6854)
* Clippy's [`README.md`]: Includes a new subsection on running Clippy as a rustc wrapper
  [#6782](https://github.com/rust-lang/rust-clippy/pull/6782)

### Others
* Running `cargo clippy` after `cargo check` now works as expected
  (`cargo clippy` and `cargo check` no longer shares the same build cache)
  [#6687](https://github.com/rust-lang/rust-clippy/pull/6687)
* Cargo now re-runs Clippy if arguments after `--` provided to `cargo clippy` are changed.
  [#6834](https://github.com/rust-lang/rust-clippy/pull/6834)
* Extracted Clippy's `utils` module into the new `clippy_utils` crate
  [#6756](https://github.com/rust-lang/rust-clippy/pull/6756)
* Clippy lintcheck tool improvements
  [#6800](https://github.com/rust-lang/rust-clippy/pull/6800)
  [#6735](https://github.com/rust-lang/rust-clippy/pull/6735)
  [#6764](https://github.com/rust-lang/rust-clippy/pull/6764)
  [#6708](https://github.com/rust-lang/rust-clippy/pull/6708)
  [#6780](https://github.com/rust-lang/rust-clippy/pull/6780)
  [#6686](https://github.com/rust-lang/rust-clippy/pull/6686)

## Rust 1.51

Released 2021-03-25

[4911ab1...3e41797](https://github.com/rust-lang/rust-clippy/compare/4911ab1...3e41797)

### New Lints

* [`upper_case_acronyms`]
  [#6475](https://github.com/rust-lang/rust-clippy/pull/6475)
* [`from_over_into`] [#6476](https://github.com/rust-lang/rust-clippy/pull/6476)
* [`case_sensitive_file_extension_comparisons`]
  [#6500](https://github.com/rust-lang/rust-clippy/pull/6500)
* [`needless_question_mark`]
  [#6507](https://github.com/rust-lang/rust-clippy/pull/6507)
* [`missing_panics_doc`]
  [#6523](https://github.com/rust-lang/rust-clippy/pull/6523)
* [`redundant_slicing`]
  [#6528](https://github.com/rust-lang/rust-clippy/pull/6528)
* [`vec_init_then_push`]
  [#6538](https://github.com/rust-lang/rust-clippy/pull/6538)
* [`ptr_as_ptr`] [#6542](https://github.com/rust-lang/rust-clippy/pull/6542)
* [`collapsible_else_if`] (split out from `collapsible_if`)
  [#6544](https://github.com/rust-lang/rust-clippy/pull/6544)
* [`inspect_for_each`] [#6577](https://github.com/rust-lang/rust-clippy/pull/6577)
* [`manual_filter_map`]
  [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
* [`exhaustive_enums`]
  [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
* [`exhaustive_structs`]
  [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)

### Moves and Deprecations

* Replace [`find_map`] with [`manual_find_map`]
  [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
* `unknown_clippy_lints` Now integrated in the `unknown_lints` rustc lint
  [#6653](https://github.com/rust-lang/rust-clippy/pull/6653)

### Enhancements

* [`ptr_arg`] Now also suggests to use `&Path` instead of `&PathBuf`
  [#6506](https://github.com/rust-lang/rust-clippy/pull/6506)
* [`cast_ptr_alignment`] Also lint when the `pointer::cast` method is used
  [#6557](https://github.com/rust-lang/rust-clippy/pull/6557)
* [`collapsible_match`] Now also deals with `&` and `*` operators in the `match`
  scrutinee [#6619](https://github.com/rust-lang/rust-clippy/pull/6619)

### False Positive Fixes

* [`similar_names`] Ignore underscore prefixed names
  [#6403](https://github.com/rust-lang/rust-clippy/pull/6403)
* [`print_literal`] and [`write_literal`] No longer lint numeric literals
  [#6408](https://github.com/rust-lang/rust-clippy/pull/6408)
* [`large_enum_variant`] No longer lints in external macros
  [#6485](https://github.com/rust-lang/rust-clippy/pull/6485)
* [`empty_enum`] Only lint if `never_type` feature is enabled
  [#6513](https://github.com/rust-lang/rust-clippy/pull/6513)
* [`field_reassign_with_default`] No longer lints in macros
  [#6553](https://github.com/rust-lang/rust-clippy/pull/6553)
* [`size_of_in_element_count`] No longer lints when dividing by element size
  [#6578](https://github.com/rust-lang/rust-clippy/pull/6578)
* [`needless_return`] No longer lints in macros
  [#6586](https://github.com/rust-lang/rust-clippy/pull/6586)
* [`match_overlapping_arm`] No longer lint when first arm is completely included
  in second arm [#6603](https://github.com/rust-lang/rust-clippy/pull/6603)
* [`doc_markdown`] Add `WebGL` to the default configuration as an allowed
  identifier [#6605](https://github.com/rust-lang/rust-clippy/pull/6605)

### Suggestion Fixes/Improvements

* [`field_reassign_with_default`] Don't expand macro in lint suggestion
  [#6531](https://github.com/rust-lang/rust-clippy/pull/6531)
* [`match_like_matches_macro`] Strip references in suggestion
  [#6532](https://github.com/rust-lang/rust-clippy/pull/6532)
* [`single_match`] Suggest `if` over `if let` when possible
  [#6574](https://github.com/rust-lang/rust-clippy/pull/6574)
* `ref_in_deref` Use parentheses correctly in suggestion
  [#6609](https://github.com/rust-lang/rust-clippy/pull/6609)
* [`stable_sort_primitive`] Clarify error message
  [#6611](https://github.com/rust-lang/rust-clippy/pull/6611)

### ICE Fixes

* [`zero_sized_map_values`]
  [#6582](https://github.com/rust-lang/rust-clippy/pull/6582)

### Documentation Improvements

* Improve search performance on the Clippy website and make it possible to
  directly search for lints on the GitHub issue tracker
  [#6483](https://github.com/rust-lang/rust-clippy/pull/6483)
* Clean up `README.md` by removing outdated paragraph
  [#6488](https://github.com/rust-lang/rust-clippy/pull/6488)
* [`await_holding_refcell_ref`] and [`await_holding_lock`]
  [#6585](https://github.com/rust-lang/rust-clippy/pull/6585)
* [`as_conversions`] [#6608](https://github.com/rust-lang/rust-clippy/pull/6608)

### Others

* Clippy now has a [Roadmap] for 2021. If you like to get involved in a bigger
  project, take a look at the [Roadmap project page]. All issues listed there
  are actively mentored
  [#6462](https://github.com/rust-lang/rust-clippy/pull/6462)
* The Clippy version number now corresponds to the Rust version number
  [#6526](https://github.com/rust-lang/rust-clippy/pull/6526)
* Fix oversight which caused Clippy to lint deps in some environments, where
  `CLIPPY_TESTS=true` was set somewhere
  [#6575](https://github.com/rust-lang/rust-clippy/pull/6575)
* Add `cargo dev-lintcheck` tool to the Clippy Dev Tool
  [#6469](https://github.com/rust-lang/rust-clippy/pull/6469)

[Roadmap]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/proposals/roadmap-2021.md
[Roadmap project page]: https://github.com/rust-lang/rust-clippy/projects/3

## Rust 1.50

Released 2021-02-11

[b20d4c1...4bd77a1](https://github.com/rust-lang/rust-clippy/compare/b20d4c1...4bd77a1)

### New Lints

* [`suspicious_operation_groupings`] [#6086](https://github.com/rust-lang/rust-clippy/pull/6086)
* [`size_of_in_element_count`] [#6394](https://github.com/rust-lang/rust-clippy/pull/6394)
* [`unnecessary_wraps`] [#6070](https://github.com/rust-lang/rust-clippy/pull/6070)
* [`let_underscore_drop`] [#6305](https://github.com/rust-lang/rust-clippy/pull/6305)
* [`collapsible_match`] [#6402](https://github.com/rust-lang/rust-clippy/pull/6402)
* [`redundant_else`] [#6330](https://github.com/rust-lang/rust-clippy/pull/6330)
* [`zero_sized_map_values`] [#6218](https://github.com/rust-lang/rust-clippy/pull/6218)
* [`print_stderr`] [#6367](https://github.com/rust-lang/rust-clippy/pull/6367)
* [`string_from_utf8_as_bytes`] [#6134](https://github.com/rust-lang/rust-clippy/pull/6134)

### Moves and Deprecations

* Previously deprecated [`str_to_string`] and [`string_to_string`] have been un-deprecated
  as `restriction` lints [#6333](https://github.com/rust-lang/rust-clippy/pull/6333)
* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panics`
  [#6351](https://github.com/rust-lang/rust-clippy/pull/6351)
* Move [`map_err_ignore`] to `restriction`
  [#6416](https://github.com/rust-lang/rust-clippy/pull/6416)
* Move [`await_holding_refcell_ref`] to `pedantic`
  [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
* Move [`await_holding_lock`] to `pedantic`
  [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)

### Enhancements

* Add the `unreadable-literal-lint-fractions` configuration to disable
  the `unreadable_literal` lint for fractions
  [#6421](https://github.com/rust-lang/rust-clippy/pull/6421)
* [`clone_on_copy`]: Now shows the type in the lint message
  [#6443](https://github.com/rust-lang/rust-clippy/pull/6443)
* [`redundant_pattern_matching`]: Now also lints on `std::task::Poll`
  [#6339](https://github.com/rust-lang/rust-clippy/pull/6339)
* [`redundant_pattern_matching`]: Additionally also lints on `std::net::IpAddr`
  [#6377](https://github.com/rust-lang/rust-clippy/pull/6377)
* [`search_is_some`]: Now suggests `contains` instead of `find(foo).is_some()`
  [#6119](https://github.com/rust-lang/rust-clippy/pull/6119)
* [`clone_double_ref`]: Now prints the reference type in the lint message
  [#6442](https://github.com/rust-lang/rust-clippy/pull/6442)
* [`modulo_one`]: Now also lints on -1.
  [#6360](https://github.com/rust-lang/rust-clippy/pull/6360)
* [`empty_loop`]: Now lints no_std crates, too
  [#6205](https://github.com/rust-lang/rust-clippy/pull/6205)
* [`or_fun_call`]: Now also lints when indexing `HashMap` or `BTreeMap`
  [#6267](https://github.com/rust-lang/rust-clippy/pull/6267)
* [`wrong_self_convention`]: Now also lints in trait definitions
  [#6316](https://github.com/rust-lang/rust-clippy/pull/6316)
* [`needless_borrow`]: Print the type in the lint message
  [#6449](https://github.com/rust-lang/rust-clippy/pull/6449)

[msrv_readme]: https://github.com/rust-lang/rust-clippy#specifying-the-minimum-supported-rust-version

### False Positive Fixes

* [`manual_range_contains`]: No longer lints in `const fn`
  [#6382](https://github.com/rust-lang/rust-clippy/pull/6382)
* [`unnecessary_lazy_evaluations`]: No longer lints if closure argument is used
  [#6370](https://github.com/rust-lang/rust-clippy/pull/6370)
* [`match_single_binding`]: Now ignores cases with `#[cfg()]` macros
  [#6435](https://github.com/rust-lang/rust-clippy/pull/6435)
* [`match_like_matches_macro`]: No longer lints on arms with attributes
  [#6290](https://github.com/rust-lang/rust-clippy/pull/6290)
* [`map_clone`]: No longer lints with deref and clone
  [#6269](https://github.com/rust-lang/rust-clippy/pull/6269)
* [`map_clone`]: No longer lints in the case of &mut
  [#6301](https://github.com/rust-lang/rust-clippy/pull/6301)
* [`needless_update`]: Now ignores `non_exhaustive` structs
  [#6464](https://github.com/rust-lang/rust-clippy/pull/6464)
* [`needless_collect`]: No longer lints when a collect is needed multiple times
  [#6313](https://github.com/rust-lang/rust-clippy/pull/6313)
* [`unnecessary_cast`] No longer lints cfg-dependent types
  [#6369](https://github.com/rust-lang/rust-clippy/pull/6369)
* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]:
  Both now ignore enums with frozen variants
  [#6110](https://github.com/rust-lang/rust-clippy/pull/6110)
* [`field_reassign_with_default`] No longer lint for private fields
  [#6537](https://github.com/rust-lang/rust-clippy/pull/6537)


### Suggestion Fixes/Improvements

* [`vec_box`]: Provide correct type scope suggestion
  [#6271](https://github.com/rust-lang/rust-clippy/pull/6271)
* [`manual_range_contains`]: Give correct suggestion when using floats
  [#6320](https://github.com/rust-lang/rust-clippy/pull/6320)
* [`unnecessary_lazy_evaluations`]: Don't always mark suggestion as MachineApplicable
  [#6272](https://github.com/rust-lang/rust-clippy/pull/6272)
* [`manual_async_fn`]: Improve suggestion formatting
  [#6294](https://github.com/rust-lang/rust-clippy/pull/6294)
* [`unnecessary_cast`]: Fix incorrectly formatted float literal suggestion
  [#6362](https://github.com/rust-lang/rust-clippy/pull/6362)

### ICE Fixes

* Fix a crash in [`from_iter_instead_of_collect`]
  [#6304](https://github.com/rust-lang/rust-clippy/pull/6304)
* Fix a silent crash when parsing doc comments in [`needless_doctest_main`]
  [#6458](https://github.com/rust-lang/rust-clippy/pull/6458)

### Documentation Improvements

* The lint website search has been improved ([#6477](https://github.com/rust-lang/rust-clippy/pull/6477)):
  * Searching for lints with dashes and spaces is possible now. For example
    `missing-errors-doc` and `missing errors doc` are now valid aliases for lint names
  * Improved fuzzy search in lint descriptions
* Various README improvements
  [#6287](https://github.com/rust-lang/rust-clippy/pull/6287)
* Add known problems to [`comparison_chain`] documentation
  [#6390](https://github.com/rust-lang/rust-clippy/pull/6390)
* Fix example used in [`cargo_common_metadata`]
  [#6293](https://github.com/rust-lang/rust-clippy/pull/6293)
* Improve [`map_clone`] documentation
  [#6340](https://github.com/rust-lang/rust-clippy/pull/6340)

### Others

* You can now tell Clippy about the MSRV your project supports. Please refer to
  the specific README section to learn more about MSRV support [here][msrv_readme]
  [#6201](https://github.com/rust-lang/rust-clippy/pull/6201)
* Add `--no-deps` option to avoid running on path dependencies in workspaces
  [#6188](https://github.com/rust-lang/rust-clippy/pull/6188)

## Rust 1.49

Released 2020-12-31

[e636b88...b20d4c1](https://github.com/rust-lang/rust-clippy/compare/e636b88...b20d4c1)

### New Lints

* [`field_reassign_with_default`] [#5911](https://github.com/rust-lang/rust-clippy/pull/5911)
* [`await_holding_refcell_ref`] [#6029](https://github.com/rust-lang/rust-clippy/pull/6029)
* [`disallowed_methods`] [#6081](https://github.com/rust-lang/rust-clippy/pull/6081)
* [`inline_asm_x86_att_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
* [`inline_asm_x86_intel_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
* [`from_iter_instead_of_collect`] [#6101](https://github.com/rust-lang/rust-clippy/pull/6101)
* [`mut_mutex_lock`] [#6103](https://github.com/rust-lang/rust-clippy/pull/6103)
* [`single_element_loop`] [#6109](https://github.com/rust-lang/rust-clippy/pull/6109)
* [`manual_unwrap_or`] [#6123](https://github.com/rust-lang/rust-clippy/pull/6123)
* [`large_types_passed_by_value`] [#6135](https://github.com/rust-lang/rust-clippy/pull/6135)
* [`result_unit_err`] [#6157](https://github.com/rust-lang/rust-clippy/pull/6157)
* [`ref_option_ref`] [#6165](https://github.com/rust-lang/rust-clippy/pull/6165)
* [`manual_range_contains`] [#6177](https://github.com/rust-lang/rust-clippy/pull/6177)
* [`unusual_byte_groupings`] [#6183](https://github.com/rust-lang/rust-clippy/pull/6183)
* [`comparison_to_empty`] [#6226](https://github.com/rust-lang/rust-clippy/pull/6226)
* [`map_collect_result_unit`] [#6227](https://github.com/rust-lang/rust-clippy/pull/6227)
* [`manual_ok_or`] [#6233](https://github.com/rust-lang/rust-clippy/pull/6233)

### Moves and Deprecations

* Rename `single_char_push_str` to [`single_char_add_str`]
  [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
* Rename `zero_width_space` to [`invisible_characters`]
  [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
* Deprecate `drop_bounds` (uplifted)
  [#6111](https://github.com/rust-lang/rust-clippy/pull/6111)
* Move [`string_lit_as_bytes`] to `nursery`
  [#6117](https://github.com/rust-lang/rust-clippy/pull/6117)
* Move [`rc_buffer`] to `restriction`
  [#6128](https://github.com/rust-lang/rust-clippy/pull/6128)

### Enhancements

* [`manual_memcpy`]: Also lint when there are loop counters (and produce a
  reliable suggestion)
  [#5727](https://github.com/rust-lang/rust-clippy/pull/5727)
* [`single_char_add_str`]: Also lint on `String::insert_str`
  [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
* [`invisible_characters`]: Also lint the characters `\u{AD}` and `\u{2060}`
  [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
* [`eq_op`]: Also lint on the `assert_*!` macro family
  [#6167](https://github.com/rust-lang/rust-clippy/pull/6167)
* [`items_after_statements`]: Also lint in local macro expansions
  [#6176](https://github.com/rust-lang/rust-clippy/pull/6176)
* [`unnecessary_cast`]: Also lint casts on integer and float literals
  [#6187](https://github.com/rust-lang/rust-clippy/pull/6187)
* [`manual_unwrap_or`]: Also lint `Result::unwrap_or`
  [#6190](https://github.com/rust-lang/rust-clippy/pull/6190)
* [`match_like_matches_macro`]: Also lint when `match` has more than two arms
  [#6216](https://github.com/rust-lang/rust-clippy/pull/6216)
* [`integer_arithmetic`]: Better handle `/` an `%` operators
  [#6229](https://github.com/rust-lang/rust-clippy/pull/6229)

### False Positive Fixes

* [`needless_lifetimes`]: Bail out if the function has a `where` clause with the
  lifetime [#5978](https://github.com/rust-lang/rust-clippy/pull/5978)
* [`explicit_counter_loop`]: No longer lints, when loop counter is used after it
  is incremented [#6076](https://github.com/rust-lang/rust-clippy/pull/6076)
* [`or_fun_call`]: Revert changes addressing the handling of `const fn`
  [#6077](https://github.com/rust-lang/rust-clippy/pull/6077)
* [`needless_range_loop`]: No longer lints, when the iterable is used in the
  range [#6102](https://github.com/rust-lang/rust-clippy/pull/6102)
* [`inconsistent_digit_grouping`]: Fix bug when using floating point exponent
  [#6104](https://github.com/rust-lang/rust-clippy/pull/6104)
* [`mistyped_literal_suffixes`]: No longer lints on the fractional part of a
  float (e.g. `713.32_64`)
  [#6114](https://github.com/rust-lang/rust-clippy/pull/6114)
* [`invalid_regex`]: No longer lint on unicode characters within `bytes::Regex`
  [#6132](https://github.com/rust-lang/rust-clippy/pull/6132)
* [`boxed_local`]: No longer lints on `extern fn` arguments
  [#6133](https://github.com/rust-lang/rust-clippy/pull/6133)
* [`needless_lifetimes`]: Fix regression, where lifetime is used in `where`
  clause [#6198](https://github.com/rust-lang/rust-clippy/pull/6198)

### Suggestion Fixes/Improvements

* [`unnecessary_sort_by`]: Avoid dereferencing the suggested closure parameter
  [#6078](https://github.com/rust-lang/rust-clippy/pull/6078)
* [`needless_arbitrary_self_type`]: Correctly handle expanded code
  [#6093](https://github.com/rust-lang/rust-clippy/pull/6093)
* [`useless_format`]: Preserve raw strings in suggestion
  [#6151](https://github.com/rust-lang/rust-clippy/pull/6151)
* [`empty_loop`]: Suggest alternatives
  [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
* [`borrowed_box`]: Correctly add parentheses in suggestion
  [#6200](https://github.com/rust-lang/rust-clippy/pull/6200)
* [`unused_unit`]: Improve suggestion formatting
  [#6247](https://github.com/rust-lang/rust-clippy/pull/6247)

### Documentation Improvements

* Some doc improvements:
    * [`rc_buffer`] [#6090](https://github.com/rust-lang/rust-clippy/pull/6090)
    * [`empty_loop`] [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
* [`doc_markdown`]: Document problematic link text style
  [#6107](https://github.com/rust-lang/rust-clippy/pull/6107)

## Rust 1.48

Released 2020-11-19

[09bd400...e636b88](https://github.com/rust-lang/rust-clippy/compare/09bd400...e636b88)

### New lints

* [`self_assignment`] [#5894](https://github.com/rust-lang/rust-clippy/pull/5894)
* [`unnecessary_lazy_evaluations`] [#5720](https://github.com/rust-lang/rust-clippy/pull/5720)
* [`manual_strip`] [#6038](https://github.com/rust-lang/rust-clippy/pull/6038)
* [`map_err_ignore`] [#5998](https://github.com/rust-lang/rust-clippy/pull/5998)
* [`rc_buffer`] [#6044](https://github.com/rust-lang/rust-clippy/pull/6044)
* `to_string_in_display` [#5831](https://github.com/rust-lang/rust-clippy/pull/5831)
* `single_char_push_str` [#5881](https://github.com/rust-lang/rust-clippy/pull/5881)

### Moves and Deprecations

* Downgrade [`verbose_bit_mask`] to pedantic
  [#6036](https://github.com/rust-lang/rust-clippy/pull/6036)

### Enhancements

* Extend [`precedence`] to handle chains of methods combined with unary negation
  [#5928](https://github.com/rust-lang/rust-clippy/pull/5928)
* [`useless_vec`]: add a configuration value for the maximum allowed size on the stack
  [#5907](https://github.com/rust-lang/rust-clippy/pull/5907)
* [`suspicious_arithmetic_impl`]: extend to implementations of `BitAnd`, `BitOr`, `BitXor`, `Rem`, `Shl`, and `Shr`
  [#5884](https://github.com/rust-lang/rust-clippy/pull/5884)
* `invalid_atomic_ordering`: detect misuse of `compare_exchange`, `compare_exchange_weak`, and `fetch_update`
  [#6025](https://github.com/rust-lang/rust-clippy/pull/6025)
* Avoid [`redundant_pattern_matching`] triggering in macros
  [#6069](https://github.com/rust-lang/rust-clippy/pull/6069)
* [`option_if_let_else`]: distinguish pure from impure `else` expressions
  [#5937](https://github.com/rust-lang/rust-clippy/pull/5937)
* [`needless_doctest_main`]: parse doctests instead of using textual search
  [#5912](https://github.com/rust-lang/rust-clippy/pull/5912)
* [`wildcard_imports`]: allow `prelude` to appear in any segment of an import
  [#5929](https://github.com/rust-lang/rust-clippy/pull/5929)
* Re-enable [`len_zero`] for ranges now that `range_is_empty` is stable
  [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
* [`option_as_ref_deref`]: catch fully-qualified calls to `Deref::deref` and `DerefMut::deref_mut`
  [#5933](https://github.com/rust-lang/rust-clippy/pull/5933)

### False Positive Fixes

* [`useless_attribute`]: permit allowing [`wildcard_imports`] and [`enum_glob_use`]
  [#5994](https://github.com/rust-lang/rust-clippy/pull/5994)
* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts
  [#5999](https://github.com/rust-lang/rust-clippy/pull/5999)
* [`redundant_closure_call`]: take into account usages of the closure in nested functions and closures
  [#5920](https://github.com/rust-lang/rust-clippy/pull/5920)
* Fix false positive in [`borrow_interior_mutable_const`] when referencing a field behind a pointer
  [#5949](https://github.com/rust-lang/rust-clippy/pull/5949)
* [`doc_markdown`]: allow using "GraphQL" without backticks
  [#5996](https://github.com/rust-lang/rust-clippy/pull/5996)
* `to_string_in_display`: avoid linting when calling `to_string()` on anything that is not `self`
  [#5971](https://github.com/rust-lang/rust-clippy/pull/5971)
* [`indexing_slicing`] and [`out_of_bounds_indexing`] treat references to arrays as arrays
  [#6034](https://github.com/rust-lang/rust-clippy/pull/6034)
* [`should_implement_trait`]: ignore methods with lifetime parameters
  [#5725](https://github.com/rust-lang/rust-clippy/pull/5725)
* [`needless_return`]: avoid linting if a temporary borrows a local variable
  [#5903](https://github.com/rust-lang/rust-clippy/pull/5903)
* Restrict [`unnecessary_sort_by`] to non-reference, Copy types
  [#6006](https://github.com/rust-lang/rust-clippy/pull/6006)
* Avoid suggesting `from_bits`/`to_bits` in const contexts in [`transmute_int_to_float`]
  [#5919](https://github.com/rust-lang/rust-clippy/pull/5919)
* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]: improve detection of interior mutable types
  [#6046](https://github.com/rust-lang/rust-clippy/pull/6046)

### Suggestion Fixes/Improvements

* [`let_and_return`]: add a cast to the suggestion when the return expression has adjustments
  [#5946](https://github.com/rust-lang/rust-clippy/pull/5946)
* [`useless_conversion`]: show the type in the error message
  [#6035](https://github.com/rust-lang/rust-clippy/pull/6035)
* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message
  [#5892](https://github.com/rust-lang/rust-clippy/pull/5892)
* [`float_cmp`] and [`float_cmp_const`]: change wording to make margin of error less ambiguous
  [#6043](https://github.com/rust-lang/rust-clippy/pull/6043)
* [`default_trait_access`]: do not use unnecessary type parameters in the suggestion
  [#5993](https://github.com/rust-lang/rust-clippy/pull/5993)
* [`collapsible_if`]: don't use expanded code in the suggestion
  [#5992](https://github.com/rust-lang/rust-clippy/pull/5992)
* Do not suggest empty format strings in [`print_with_newline`] and [`write_with_newline`]
  [#6042](https://github.com/rust-lang/rust-clippy/pull/6042)
* [`unit_arg`]: improve the readability of the suggestion
  [#5931](https://github.com/rust-lang/rust-clippy/pull/5931)
* [`stable_sort_primitive`]: print the type that is being sorted in the lint message
  [#5935](https://github.com/rust-lang/rust-clippy/pull/5935)
* Show line count and max lines in [`too_many_lines`] lint message
  [#6009](https://github.com/rust-lang/rust-clippy/pull/6009)
* Keep parentheses in the suggestion of [`useless_conversion`] where applicable
  [#5900](https://github.com/rust-lang/rust-clippy/pull/5900)
* [`option_map_unit_fn`] and [`result_map_unit_fn`]: print the unit type `()` explicitly
  [#6024](https://github.com/rust-lang/rust-clippy/pull/6024)
* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>`
  [#5899](https://github.com/rust-lang/rust-clippy/pull/5899)
* Make lint messages adhere to rustc dev guide conventions
  [#5893](https://github.com/rust-lang/rust-clippy/pull/5893)

### ICE Fixes

* Fix ICE in [`repeat_once`]
  [#5948](https://github.com/rust-lang/rust-clippy/pull/5948)

### Documentation Improvements

* [`mutable_key_type`]: explain potential for false positives when the interior mutable type is not accessed in the `Hash` implementation
  [#6019](https://github.com/rust-lang/rust-clippy/pull/6019)
* [`unnecessary_mut_passed`]: fix typo
  [#5913](https://github.com/rust-lang/rust-clippy/pull/5913)
* Add example of false positive to [`ptr_arg`] docs.
  [#5885](https://github.com/rust-lang/rust-clippy/pull/5885)
* [`box_vec`](https://rust-lang.github.io/rust-clippy/master/index.html#box_collection), [`vec_box`] and [`borrowed_box`]: add link to the documentation of `Box`
  [#6023](https://github.com/rust-lang/rust-clippy/pull/6023)

## Rust 1.47

Released 2020-10-08

[c2c07fa...09bd400](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...09bd400)

### New lints

* [`derive_ord_xor_partial_ord`] [#5848](https://github.com/rust-lang/rust-clippy/pull/5848)
* [`trait_duplication_in_bounds`] [#5852](https://github.com/rust-lang/rust-clippy/pull/5852)
* [`map_identity`] [#5694](https://github.com/rust-lang/rust-clippy/pull/5694)
* [`unit_return_expecting_ord`] [#5737](https://github.com/rust-lang/rust-clippy/pull/5737)
* [`pattern_type_mismatch`] [#4841](https://github.com/rust-lang/rust-clippy/pull/4841)
* [`repeat_once`] [#5773](https://github.com/rust-lang/rust-clippy/pull/5773)
* [`same_item_push`] [#5825](https://github.com/rust-lang/rust-clippy/pull/5825)
* [`needless_arbitrary_self_type`] [#5869](https://github.com/rust-lang/rust-clippy/pull/5869)
* [`match_like_matches_macro`] [#5769](https://github.com/rust-lang/rust-clippy/pull/5769)
* [`stable_sort_primitive`] [#5809](https://github.com/rust-lang/rust-clippy/pull/5809)
* [`blanket_clippy_restriction_lints`] [#5750](https://github.com/rust-lang/rust-clippy/pull/5750)
* [`option_if_let_else`] [#5301](https://github.com/rust-lang/rust-clippy/pull/5301)

### Moves and Deprecations

* Deprecate [`regex_macro`] lint
  [#5760](https://github.com/rust-lang/rust-clippy/pull/5760)
* Move [`range_minus_one`] to `pedantic`
  [#5752](https://github.com/rust-lang/rust-clippy/pull/5752)

### Enhancements

* Improve [`needless_collect`] by catching `collect` calls followed by `iter` or `into_iter` calls
  [#5837](https://github.com/rust-lang/rust-clippy/pull/5837)
* [`panic`], [`todo`], [`unimplemented`] and [`unreachable`] now detect calls with formatting
  [#5811](https://github.com/rust-lang/rust-clippy/pull/5811)
* Detect more cases of [`suboptimal_flops`] and [`imprecise_flops`]
  [#5443](https://github.com/rust-lang/rust-clippy/pull/5443)
* Handle asymmetrical implementations of `PartialEq` in [`cmp_owned`]
  [#5701](https://github.com/rust-lang/rust-clippy/pull/5701)
* Make it possible to allow [`unsafe_derive_deserialize`]
  [#5870](https://github.com/rust-lang/rust-clippy/pull/5870)
* Catch `ord.min(a).max(b)` where a < b in [`min_max`]
  [#5871](https://github.com/rust-lang/rust-clippy/pull/5871)
* Make [`clone_on_copy`] suggestion machine applicable
  [#5745](https://github.com/rust-lang/rust-clippy/pull/5745)
* Enable [`len_zero`] on ranges now that `is_empty` is stable on them
  [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)

### False Positive Fixes

* Avoid triggering [`or_fun_call`] with const fns that take no arguments
  [#5889](https://github.com/rust-lang/rust-clippy/pull/5889)
* Fix [`redundant_closure_call`] false positive for closures that have multiple calls
  [#5800](https://github.com/rust-lang/rust-clippy/pull/5800)
* Don't lint cases involving `ManuallyDrop` in [`redundant_clone`]
  [#5824](https://github.com/rust-lang/rust-clippy/pull/5824)
* Treat a single expression the same as a single statement in the 2nd arm of a match in [`single_match_else`]
  [#5771](https://github.com/rust-lang/rust-clippy/pull/5771)
* Don't trigger [`unnested_or_patterns`] if the feature `or_patterns` is not enabled
  [#5758](https://github.com/rust-lang/rust-clippy/pull/5758)
* Avoid linting if key borrows in [`unnecessary_sort_by`]
  [#5756](https://github.com/rust-lang/rust-clippy/pull/5756)
* Consider `Try` impl for `Poll` when generating suggestions in [`try_err`]
  [#5857](https://github.com/rust-lang/rust-clippy/pull/5857)
* Take input lifetimes into account in `manual_async_fn`
  [#5859](https://github.com/rust-lang/rust-clippy/pull/5859)
* Fix multiple false positives in [`type_repetition_in_bounds`] and add a configuration option
  [#5761](https://github.com/rust-lang/rust-clippy/pull/5761)
* Limit the [`suspicious_arithmetic_impl`] lint to one binary operation
  [#5820](https://github.com/rust-lang/rust-clippy/pull/5820)

### Suggestion Fixes/Improvements

* Improve readability of [`shadow_unrelated`] suggestion by truncating the RHS snippet
  [#5788](https://github.com/rust-lang/rust-clippy/pull/5788)
* Suggest `filter_map` instead of `flat_map` when mapping to `Option` in [`map_flatten`]
  [#5846](https://github.com/rust-lang/rust-clippy/pull/5846)
* Ensure suggestion is shown correctly for long method call chains in [`iter_nth_zero`]
  [#5793](https://github.com/rust-lang/rust-clippy/pull/5793)
* Drop borrow operator in suggestions of [`redundant_pattern_matching`]
  [#5815](https://github.com/rust-lang/rust-clippy/pull/5815)
* Add suggestion for [`iter_skip_next`]
  [#5843](https://github.com/rust-lang/rust-clippy/pull/5843)
* Improve [`collapsible_if`] fix suggestion
  [#5732](https://github.com/rust-lang/rust-clippy/pull/5732)

### ICE Fixes

* Fix ICE caused by [`needless_collect`]
  [#5877](https://github.com/rust-lang/rust-clippy/pull/5877)
* Fix ICE caused by [`unnested_or_patterns`]
  [#5784](https://github.com/rust-lang/rust-clippy/pull/5784)

### Documentation Improvements

* Fix grammar of [`await_holding_lock`] documentation
  [#5748](https://github.com/rust-lang/rust-clippy/pull/5748)

### Others

* Make lints adhere to the rustc dev guide
  [#5888](https://github.com/rust-lang/rust-clippy/pull/5888)

## Rust 1.46

Released 2020-08-27

[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...c2c07fa)

### New lints

* [`unnested_or_patterns`] [#5378](https://github.com/rust-lang/rust-clippy/pull/5378)
* [`iter_next_slice`] [#5597](https://github.com/rust-lang/rust-clippy/pull/5597)
* [`unnecessary_sort_by`] [#5623](https://github.com/rust-lang/rust-clippy/pull/5623)
* [`vec_resize_to_zero`] [#5637](https://github.com/rust-lang/rust-clippy/pull/5637)

### Moves and Deprecations

* Move [`cast_ptr_alignment`] to pedantic [#5667](https://github.com/rust-lang/rust-clippy/pull/5667)

### Enhancements

* Improve [`mem_replace_with_uninit`] lint [#5695](https://github.com/rust-lang/rust-clippy/pull/5695)

### False Positive Fixes

* [`len_zero`]: Avoid linting ranges when the `range_is_empty` feature is not enabled
  [#5656](https://github.com/rust-lang/rust-clippy/pull/5656)
* [`let_and_return`]: Don't lint if a temporary borrow is involved
  [#5680](https://github.com/rust-lang/rust-clippy/pull/5680)
* [`reversed_empty_ranges`]: Avoid linting `N..N` in for loop arguments in
  [#5692](https://github.com/rust-lang/rust-clippy/pull/5692)
* [`if_same_then_else`]: Don't assume multiplication is always commutative
  [#5702](https://github.com/rust-lang/rust-clippy/pull/5702)
* [`disallowed_names`]: Remove `bar` from the default configuration
  [#5712](https://github.com/rust-lang/rust-clippy/pull/5712)
* [`redundant_pattern_matching`]: Avoid suggesting non-`const fn` calls in const contexts
  [#5724](https://github.com/rust-lang/rust-clippy/pull/5724)

### Suggestion Fixes/Improvements

* Fix suggestion of [`unit_arg`] lint, so that it suggest semantic equivalent code
  [#4455](https://github.com/rust-lang/rust-clippy/pull/4455)
* Add auto applicable suggestion to [`macro_use_imports`]
  [#5279](https://github.com/rust-lang/rust-clippy/pull/5279)

### ICE Fixes

* Fix ICE in the `consts` module of Clippy [#5709](https://github.com/rust-lang/rust-clippy/pull/5709)

### Documentation Improvements

* Improve code examples across multiple lints [#5664](https://github.com/rust-lang/rust-clippy/pull/5664)

### Others

* Introduce a `--rustc` flag to `clippy-driver`, which turns `clippy-driver`
  into `rustc` and passes all the given arguments to `rustc`. This is especially
  useful for tools that need the `rustc` version Clippy was compiled with,
  instead of the Clippy version. E.g. `clippy-driver --rustc --version` will
  print the output of `rustc --version`.
  [#5178](https://github.com/rust-lang/rust-clippy/pull/5178)
* New issue templates now make it easier to complain if Clippy is too annoying
  or not annoying enough! [#5735](https://github.com/rust-lang/rust-clippy/pull/5735)

## Rust 1.45

Released 2020-07-16

[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)

### New lints

* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)

### Moves and Deprecations

* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)

### Enhancements

* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)

### False Positive Fixes

* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)

### Suggestion Improvements

* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)

### ICE Fixes

* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)

### Documentation

* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)

## Rust 1.44

Released 2020-06-04

[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)

### New lints

* [`explicit_deref_methods`] [#5226](https://github.com/rust-lang/rust-clippy/pull/5226)
* [`implicit_saturating_sub`] [#5427](https://github.com/rust-lang/rust-clippy/pull/5427)
* [`macro_use_imports`] [#5230](https://github.com/rust-lang/rust-clippy/pull/5230)
* [`verbose_file_reads`] [#5272](https://github.com/rust-lang/rust-clippy/pull/5272)
* [`future_not_send`] [#5423](https://github.com/rust-lang/rust-clippy/pull/5423)
* [`redundant_pub_crate`] [#5319](https://github.com/rust-lang/rust-clippy/pull/5319)
* [`large_const_arrays`] [#5248](https://github.com/rust-lang/rust-clippy/pull/5248)
* [`result_map_or_into_option`] [#5415](https://github.com/rust-lang/rust-clippy/pull/5415)
* [`redundant_allocation`] [#5349](https://github.com/rust-lang/rust-clippy/pull/5349)
* [`fn_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
* [`vtable_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)


### Moves and Deprecations

* Deprecate [`replace_consts`] lint [#5380](https://github.com/rust-lang/rust-clippy/pull/5380)
* Move [`cognitive_complexity`] to nursery [#5428](https://github.com/rust-lang/rust-clippy/pull/5428)
* Move [`useless_transmute`] to nursery [#5364](https://github.com/rust-lang/rust-clippy/pull/5364)
* Downgrade [`inefficient_to_string`] to pedantic [#5412](https://github.com/rust-lang/rust-clippy/pull/5412)
* Downgrade [`option_option`] to pedantic [#5401](https://github.com/rust-lang/rust-clippy/pull/5401)
* Downgrade [`unreadable_literal`] to pedantic [#5419](https://github.com/rust-lang/rust-clippy/pull/5419)
* Downgrade [`let_unit_value`] to pedantic [#5409](https://github.com/rust-lang/rust-clippy/pull/5409)
* Downgrade [`trivially_copy_pass_by_ref`] to pedantic [#5410](https://github.com/rust-lang/rust-clippy/pull/5410)
* Downgrade [`implicit_hasher`] to pedantic [#5411](https://github.com/rust-lang/rust-clippy/pull/5411)

### Enhancements

* On _nightly_ you can now use `cargo clippy --fix -Z unstable-options` to
  auto-fix lints that support this [#5363](https://github.com/rust-lang/rust-clippy/pull/5363)
* Make [`redundant_clone`] also trigger on cases where the cloned value is not
  consumed. [#5304](https://github.com/rust-lang/rust-clippy/pull/5304)
* Expand [`integer_arithmetic`] to also disallow bit-shifting [#5430](https://github.com/rust-lang/rust-clippy/pull/5430)
* [`option_as_ref_deref`] now detects more deref cases [#5425](https://github.com/rust-lang/rust-clippy/pull/5425)
* [`large_enum_variant`] now report the sizes of the largest and second-largest variants [#5466](https://github.com/rust-lang/rust-clippy/pull/5466)
* [`bool_comparison`] now also checks for inequality comparisons that can be
  written more concisely [#5365](https://github.com/rust-lang/rust-clippy/pull/5365)
* Expand [`clone_on_copy`] to work in method call arguments as well [#5441](https://github.com/rust-lang/rust-clippy/pull/5441)
* [`redundant_pattern_matching`] now also handles `while let` [#5483](https://github.com/rust-lang/rust-clippy/pull/5483)
* [`integer_arithmetic`] now also lints references of integers [#5329](https://github.com/rust-lang/rust-clippy/pull/5329)
* Expand [`float_cmp_const`] to also work on arrays [#5345](https://github.com/rust-lang/rust-clippy/pull/5345)
* Trigger [`map_flatten`] when map is called on an `Option` [#5473](https://github.com/rust-lang/rust-clippy/pull/5473)

### False Positive Fixes

* [`many_single_char_names`] [#5468](https://github.com/rust-lang/rust-clippy/pull/5468)
* [`should_implement_trait`] [#5437](https://github.com/rust-lang/rust-clippy/pull/5437)
* [`unused_self`] [#5387](https://github.com/rust-lang/rust-clippy/pull/5387)
* [`redundant_clone`] [#5453](https://github.com/rust-lang/rust-clippy/pull/5453)
* [`precedence`] [#5445](https://github.com/rust-lang/rust-clippy/pull/5445)
* [`suspicious_op_assign_impl`] [#5424](https://github.com/rust-lang/rust-clippy/pull/5424)
* [`needless_lifetimes`] [#5293](https://github.com/rust-lang/rust-clippy/pull/5293)
* [`redundant_pattern`] [#5287](https://github.com/rust-lang/rust-clippy/pull/5287)
* [`inconsistent_digit_grouping`] [#5451](https://github.com/rust-lang/rust-clippy/pull/5451)


### Suggestion Improvements

* Improved [`question_mark`] lint suggestion so that it doesn't add redundant `as_ref()` [#5481](https://github.com/rust-lang/rust-clippy/pull/5481)
* Improve the suggested placeholder in [`option_map_unit_fn`] [#5292](https://github.com/rust-lang/rust-clippy/pull/5292)
* Improve suggestion for [`match_single_binding`] when triggered inside a closure [#5350](https://github.com/rust-lang/rust-clippy/pull/5350)

### ICE Fixes

* Handle the unstable `trivial_bounds` feature [#5296](https://github.com/rust-lang/rust-clippy/pull/5296)
* `shadow_*` lints [#5297](https://github.com/rust-lang/rust-clippy/pull/5297)

### Documentation

* Fix documentation generation for configurable lints [#5353](https://github.com/rust-lang/rust-clippy/pull/5353)
* Update documentation for [`new_ret_no_self`] [#5448](https://github.com/rust-lang/rust-clippy/pull/5448)
* The documentation for [`option_option`] now suggest using a tri-state enum [#5403](https://github.com/rust-lang/rust-clippy/pull/5403)
* Fix bit mask example in [`verbose_bit_mask`] documentation [#5454](https://github.com/rust-lang/rust-clippy/pull/5454)
* [`wildcard_imports`] documentation now mentions that `use ...::prelude::*` is
  not linted [#5312](https://github.com/rust-lang/rust-clippy/pull/5312)

## Rust 1.43

Released 2020-04-23

[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)

### New lints

* [`imprecise_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
* [`suboptimal_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
* [`wildcard_imports`] [#5029](https://github.com/rust-lang/rust-clippy/pull/5029)
* [`single_component_path_imports`] [#5058](https://github.com/rust-lang/rust-clippy/pull/5058)
* [`match_single_binding`] [#5061](https://github.com/rust-lang/rust-clippy/pull/5061)
* [`let_underscore_lock`] [#5101](https://github.com/rust-lang/rust-clippy/pull/5101)
* [`struct_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
* [`fn_params_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
* [`option_env_unwrap`] [#5148](https://github.com/rust-lang/rust-clippy/pull/5148)
* [`lossy_float_literal`] [#5202](https://github.com/rust-lang/rust-clippy/pull/5202)
* [`rest_pat_in_fully_bound_structs`] [#5258](https://github.com/rust-lang/rust-clippy/pull/5258)

### Moves and Deprecations

* Move [`unneeded_field_pattern`] to pedantic group [#5200](https://github.com/rust-lang/rust-clippy/pull/5200)

### Enhancements

* Make [`missing_errors_doc`] lint also trigger on `async` functions
  [#5181](https://github.com/rust-lang/rust-clippy/pull/5181)
* Add more constants to [`approx_constant`] [#5193](https://github.com/rust-lang/rust-clippy/pull/5193)
* Extend [`question_mark`] lint [#5266](https://github.com/rust-lang/rust-clippy/pull/5266)

### False Positive Fixes

* [`use_debug`] [#5047](https://github.com/rust-lang/rust-clippy/pull/5047)
* [`unnecessary_unwrap`] [#5132](https://github.com/rust-lang/rust-clippy/pull/5132)
* [`zero_prefixed_literal`] [#5170](https://github.com/rust-lang/rust-clippy/pull/5170)
* [`missing_const_for_fn`] [#5216](https://github.com/rust-lang/rust-clippy/pull/5216)

### Suggestion Improvements

* Improve suggestion when blocks of code are suggested [#5134](https://github.com/rust-lang/rust-clippy/pull/5134)

### ICE Fixes

* `misc_early` lints [#5129](https://github.com/rust-lang/rust-clippy/pull/5129)
* [`missing_errors_doc`] [#5213](https://github.com/rust-lang/rust-clippy/pull/5213)
* Fix ICE when evaluating `usize`s [#5256](https://github.com/rust-lang/rust-clippy/pull/5256)

### Documentation

* Improve documentation of [`iter_nth_zero`]
* Add documentation pages for stable releases [#5171](https://github.com/rust-lang/rust-clippy/pull/5171)

### Others

* Clippy now completely runs on GitHub Actions [#5190](https://github.com/rust-lang/rust-clippy/pull/5190)


## Rust 1.42

Released 2020-03-12

[69f99e7...4ee1206](https://github.com/rust-lang/rust-clippy/compare/69f99e7...4ee1206)

### New lints

* [`filetype_is_file`] [#4543](https://github.com/rust-lang/rust-clippy/pull/4543)
* [`let_underscore_must_use`] [#4823](https://github.com/rust-lang/rust-clippy/pull/4823)
* [`modulo_arithmetic`] [#4867](https://github.com/rust-lang/rust-clippy/pull/4867)
* [`mem_replace_with_default`] [#4881](https://github.com/rust-lang/rust-clippy/pull/4881)
* [`mutable_key_type`] [#4885](https://github.com/rust-lang/rust-clippy/pull/4885)
* [`option_as_ref_deref`] [#4945](https://github.com/rust-lang/rust-clippy/pull/4945)
* [`wildcard_in_or_patterns`] [#4960](https://github.com/rust-lang/rust-clippy/pull/4960)
* [`iter_nth_zero`] [#4966](https://github.com/rust-lang/rust-clippy/pull/4966)
* `invalid_atomic_ordering` [#4999](https://github.com/rust-lang/rust-clippy/pull/4999)
* [`skip_while_next`] [#5067](https://github.com/rust-lang/rust-clippy/pull/5067)

### Moves and Deprecations

* Move [`transmute_float_to_int`] from nursery to complexity group
  [#5015](https://github.com/rust-lang/rust-clippy/pull/5015)
* Move [`range_plus_one`] to pedantic group [#5057](https://github.com/rust-lang/rust-clippy/pull/5057)
* Move [`debug_assert_with_mut_call`] to nursery group [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
* Deprecate `unused_label` [#4930](https://github.com/rust-lang/rust-clippy/pull/4930)

### Enhancements

* Lint vectored IO in [`unused_io_amount`] [#5027](https://github.com/rust-lang/rust-clippy/pull/5027)
* Make [`vec_box`] configurable by adding a size threshold [#5081](https://github.com/rust-lang/rust-clippy/pull/5081)
* Also lint constants in [`cmp_nan`] [#4910](https://github.com/rust-lang/rust-clippy/pull/4910)
* Fix false negative in [`expect_fun_call`] [#4915](https://github.com/rust-lang/rust-clippy/pull/4915)
* Fix false negative in [`redundant_clone`] [#5017](https://github.com/rust-lang/rust-clippy/pull/5017)

### False Positive Fixes

* [`map_clone`] [#4937](https://github.com/rust-lang/rust-clippy/pull/4937)
* [`replace_consts`] [#4977](https://github.com/rust-lang/rust-clippy/pull/4977)
* [`let_and_return`] [#5008](https://github.com/rust-lang/rust-clippy/pull/5008)
* [`eq_op`] [#5079](https://github.com/rust-lang/rust-clippy/pull/5079)
* [`possible_missing_comma`] [#5083](https://github.com/rust-lang/rust-clippy/pull/5083)
* [`debug_assert_with_mut_call`] [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
* Don't trigger [`let_underscore_must_use`] in external macros
  [#5082](https://github.com/rust-lang/rust-clippy/pull/5082)
* Don't trigger [`empty_loop`] in `no_std` crates [#5086](https://github.com/rust-lang/rust-clippy/pull/5086)

### Suggestion Improvements

* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634)
* [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934)
* [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935)
* [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956)
* `unknown_clippy_lints` [#4963](https://github.com/rust-lang/rust-clippy/pull/4963)
* [`explicit_into_iter_loop`] [#4978](https://github.com/rust-lang/rust-clippy/pull/4978)
* [`useless_attribute`] [#5022](https://github.com/rust-lang/rust-clippy/pull/5022)
* `if_let_some_result` [#5032](https://github.com/rust-lang/rust-clippy/pull/5032)

### ICE fixes

* [`unsound_collection_transmute`] [#4975](https://github.com/rust-lang/rust-clippy/pull/4975)

### Documentation

* Improve documentation of [`empty_enum`], [`replace_consts`], [`redundant_clone`], and [`iterator_step_by_zero`]


## Rust 1.41

Released 2020-01-30

[c8e3cfb...69f99e7](https://github.com/rust-lang/rust-clippy/compare/c8e3cfb...69f99e7)

* New Lints:
  * [`exit`] [#4697](https://github.com/rust-lang/rust-clippy/pull/4697)
  * [`to_digit_is_some`] [#4801](https://github.com/rust-lang/rust-clippy/pull/4801)
  * [`tabs_in_doc_comments`] [#4806](https://github.com/rust-lang/rust-clippy/pull/4806)
  * [`large_stack_arrays`] [#4807](https://github.com/rust-lang/rust-clippy/pull/4807)
  * [`same_functions_in_if_condition`] [#4814](https://github.com/rust-lang/rust-clippy/pull/4814)
  * [`zst_offset`] [#4816](https://github.com/rust-lang/rust-clippy/pull/4816)
  * [`as_conversions`] [#4821](https://github.com/rust-lang/rust-clippy/pull/4821)
  * [`missing_errors_doc`] [#4884](https://github.com/rust-lang/rust-clippy/pull/4884)
  * [`transmute_float_to_int`] [#4889](https://github.com/rust-lang/rust-clippy/pull/4889)
* Remove plugin interface, see
  [Inside Rust Blog](https://blog.rust-lang.org/inside-rust/2019/11/04/Clippy-removes-plugin-interface.html) for
  details [#4714](https://github.com/rust-lang/rust-clippy/pull/4714)
* Move [`use_self`] to nursery group [#4863](https://github.com/rust-lang/rust-clippy/pull/4863)
* Deprecate `into_iter_on_array` [#4788](https://github.com/rust-lang/rust-clippy/pull/4788)
* Expand [`string_lit_as_bytes`] to also trigger when literal has escapes
  [#4808](https://github.com/rust-lang/rust-clippy/pull/4808)
* Fix false positive in `comparison_chain` [#4842](https://github.com/rust-lang/rust-clippy/pull/4842)
* Fix false positive in `while_immutable_condition` [#4730](https://github.com/rust-lang/rust-clippy/pull/4730)
* Fix false positive in `explicit_counter_loop` [#4803](https://github.com/rust-lang/rust-clippy/pull/4803)
* Fix false positive in `must_use_candidate` [#4794](https://github.com/rust-lang/rust-clippy/pull/4794)
* Fix false positive in `print_with_newline` and `write_with_newline`
  [#4769](https://github.com/rust-lang/rust-clippy/pull/4769)
* Fix false positive in `derive_hash_xor_eq` [#4766](https://github.com/rust-lang/rust-clippy/pull/4766)
* Fix false positive in `missing_inline_in_public_items` [#4870](https://github.com/rust-lang/rust-clippy/pull/4870)
* Fix false positive in `string_add` [#4880](https://github.com/rust-lang/rust-clippy/pull/4880)
* Fix false positive in `float_arithmetic` [#4851](https://github.com/rust-lang/rust-clippy/pull/4851)
* Fix false positive in `cast_sign_loss` [#4883](https://github.com/rust-lang/rust-clippy/pull/4883)
* Fix false positive in `manual_swap` [#4877](https://github.com/rust-lang/rust-clippy/pull/4877)
* Fix ICEs occurring while checking some block expressions [#4772](https://github.com/rust-lang/rust-clippy/pull/4772)
* Fix ICE in `use_self` [#4776](https://github.com/rust-lang/rust-clippy/pull/4776)
* Fix ICEs related to `const_generics` [#4780](https://github.com/rust-lang/rust-clippy/pull/4780)
* Display help when running `clippy-driver` without arguments, instead of ICEing
  [#4810](https://github.com/rust-lang/rust-clippy/pull/4810)
* Clippy has its own ICE message now [#4588](https://github.com/rust-lang/rust-clippy/pull/4588)
* Show deprecated lints in the documentation again [#4757](https://github.com/rust-lang/rust-clippy/pull/4757)
* Improve Documentation by adding positive examples to some lints
  [#4832](https://github.com/rust-lang/rust-clippy/pull/4832)

## Rust 1.40

Released 2019-12-19

[4e7e71b...c8e3cfb](https://github.com/rust-lang/rust-clippy/compare/4e7e71b...c8e3cfb)

* New Lints:
  * [`unneeded_wildcard_pattern`] [#4537](https://github.com/rust-lang/rust-clippy/pull/4537)
  * [`needless_doctest_main`] [#4603](https://github.com/rust-lang/rust-clippy/pull/4603)
  * [`suspicious_unary_op_formatting`] [#4615](https://github.com/rust-lang/rust-clippy/pull/4615)
  * [`debug_assert_with_mut_call`] [#4680](https://github.com/rust-lang/rust-clippy/pull/4680)
  * [`unused_self`] [#4619](https://github.com/rust-lang/rust-clippy/pull/4619)
  * [`inefficient_to_string`] [#4683](https://github.com/rust-lang/rust-clippy/pull/4683)
  * [`must_use_unit`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
  * [`must_use_candidate`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
  * [`double_must_use`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
  * [`comparison_chain`] [#4569](https://github.com/rust-lang/rust-clippy/pull/4569)
  * [`unsound_collection_transmute`] [#4592](https://github.com/rust-lang/rust-clippy/pull/4592)
  * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
  * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
  * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
  * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
  * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
* Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
* Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736)
* Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613)
* Expand `integer_arithmetic` to also detect mutating arithmetic like `+=` [#4585](https://github.com/rust-lang/rust-clippy/pull/4585)
* Fix false positive in `nonminimal_bool` [#4568](https://github.com/rust-lang/rust-clippy/pull/4568)
* Fix false positive in `missing_safety_doc` [#4611](https://github.com/rust-lang/rust-clippy/pull/4611)
* Fix false positive in `cast_sign_loss` [#4614](https://github.com/rust-lang/rust-clippy/pull/4614)
* Fix false positive in `redundant_clone` [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
* Fix false positive in `try_err` [#4721](https://github.com/rust-lang/rust-clippy/pull/4721)
* Fix false positive in `toplevel_ref_arg` [#4570](https://github.com/rust-lang/rust-clippy/pull/4570)
* Fix false positive in `multiple_inherent_impl` [#4593](https://github.com/rust-lang/rust-clippy/pull/4593)
* Improve more suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4575](https://github.com/rust-lang/rust-clippy/pull/4575)
* Improve suggestion for `zero_ptr` [#4599](https://github.com/rust-lang/rust-clippy/pull/4599)
* Improve suggestion for `explicit_counter_loop` [#4691](https://github.com/rust-lang/rust-clippy/pull/4691)
* Improve suggestion for `mul_add` [#4602](https://github.com/rust-lang/rust-clippy/pull/4602)
* Improve suggestion for `assertions_on_constants` [#4635](https://github.com/rust-lang/rust-clippy/pull/4635)
* Fix ICE in `use_self` [#4671](https://github.com/rust-lang/rust-clippy/pull/4671)
* Fix ICE when encountering const casts [#4590](https://github.com/rust-lang/rust-clippy/pull/4590)

## Rust 1.39

Released 2019-11-07

[3aea860...4e7e71b](https://github.com/rust-lang/rust-clippy/compare/3aea860...4e7e71b)

* New Lints:
  * [`uninit_assumed_init`] [#4479](https://github.com/rust-lang/rust-clippy/pull/4479)
  * [`flat_map_identity`] [#4231](https://github.com/rust-lang/rust-clippy/pull/4231)
  * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
  * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
  * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
  * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
  * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
* Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
* Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
* Move `cast_lossless` to pedantic group [#4539](https://github.com/rust-lang/rust-clippy/pull/4539)
* `temporary_cstring_as_ptr` now catches more cases [#4425](https://github.com/rust-lang/rust-clippy/pull/4425)
* `use_self` now works in constructors, too [#4525](https://github.com/rust-lang/rust-clippy/pull/4525)
* `cargo_common_metadata` now checks for license files [#4518](https://github.com/rust-lang/rust-clippy/pull/4518)
* `cognitive_complexity` now includes the measured complexity in the warning message [#4469](https://github.com/rust-lang/rust-clippy/pull/4469)
* Fix false positives in `block_in_if_*` lints [#4458](https://github.com/rust-lang/rust-clippy/pull/4458)
* Fix false positive in `cast_lossless` [#4473](https://github.com/rust-lang/rust-clippy/pull/4473)
* Fix false positive in `clone_on_copy` [#4411](https://github.com/rust-lang/rust-clippy/pull/4411)
* Fix false positive in `deref_addrof` [#4487](https://github.com/rust-lang/rust-clippy/pull/4487)
* Fix false positive in `too_many_lines` [#4490](https://github.com/rust-lang/rust-clippy/pull/4490)
* Fix false positive in `new_ret_no_self` [#4365](https://github.com/rust-lang/rust-clippy/pull/4365)
* Fix false positive in `manual_swap` [#4478](https://github.com/rust-lang/rust-clippy/pull/4478)
* Fix false positive in `missing_const_for_fn` [#4450](https://github.com/rust-lang/rust-clippy/pull/4450)
* Fix false positive in `extra_unused_lifetimes` [#4477](https://github.com/rust-lang/rust-clippy/pull/4477)
* Fix false positive in `inherent_to_string` [#4460](https://github.com/rust-lang/rust-clippy/pull/4460)
* Fix false positive in `map_entry` [#4495](https://github.com/rust-lang/rust-clippy/pull/4495)
* Fix false positive in `unused_unit` [#4445](https://github.com/rust-lang/rust-clippy/pull/4445)
* Fix false positive in `redundant_pattern` [#4489](https://github.com/rust-lang/rust-clippy/pull/4489)
* Fix false positive in `wrong_self_convention` [#4369](https://github.com/rust-lang/rust-clippy/pull/4369)
* Improve various suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4558](https://github.com/rust-lang/rust-clippy/pull/4558)
* Improve suggestions for `redundant_pattern_matching` [#4352](https://github.com/rust-lang/rust-clippy/pull/4352)
* Improve suggestions for `explicit_write` [#4544](https://github.com/rust-lang/rust-clippy/pull/4544)
* Improve suggestion for `or_fun_call` [#4522](https://github.com/rust-lang/rust-clippy/pull/4522)
* Improve suggestion for `match_as_ref` [#4446](https://github.com/rust-lang/rust-clippy/pull/4446)
* Improve suggestion for `unnecessary_fold_span` [#4382](https://github.com/rust-lang/rust-clippy/pull/4382)
* Add suggestions for `unseparated_literal_suffix` [#4401](https://github.com/rust-lang/rust-clippy/pull/4401)
* Add suggestions for `char_lit_as_u8` [#4418](https://github.com/rust-lang/rust-clippy/pull/4418)

## Rust 1.38

Released 2019-09-26

[e3cb40e...3aea860](https://github.com/rust-lang/rust-clippy/compare/e3cb40e...3aea860)

* New Lints:
  * [`main_recursion`] [#4203](https://github.com/rust-lang/rust-clippy/pull/4203)
  * [`inherent_to_string`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
  * [`inherent_to_string_shadow_display`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
  * [`type_repetition_in_bounds`] [#3766](https://github.com/rust-lang/rust-clippy/pull/3766)
  * [`try_err`] [#4222](https://github.com/rust-lang/rust-clippy/pull/4222)
* Move `{unnecessary,panicking}_unwrap` out of nursery [#4307](https://github.com/rust-lang/rust-clippy/pull/4307)
* Extend the `use_self` lint to suggest uses of `Self::Variant` [#4308](https://github.com/rust-lang/rust-clippy/pull/4308)
* Improve suggestion for needless return [#4262](https://github.com/rust-lang/rust-clippy/pull/4262)
* Add auto-fixable suggestion for `let_unit` [#4337](https://github.com/rust-lang/rust-clippy/pull/4337)
* Fix false positive in `pub_enum_variant_names` and `enum_variant_names` [#4345](https://github.com/rust-lang/rust-clippy/pull/4345)
* Fix false positive in `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
* Fix false positive in `string_lit_as_bytes` [#4233](https://github.com/rust-lang/rust-clippy/pull/4233)
* Fix false positive in `needless_lifetimes` [#4266](https://github.com/rust-lang/rust-clippy/pull/4266)
* Fix false positive in `float_cmp` [#4275](https://github.com/rust-lang/rust-clippy/pull/4275)
* Fix false positives in `needless_return` [#4274](https://github.com/rust-lang/rust-clippy/pull/4274)
* Fix false negative in `match_same_arms` [#4246](https://github.com/rust-lang/rust-clippy/pull/4246)
* Fix incorrect suggestion for `needless_bool` [#4335](https://github.com/rust-lang/rust-clippy/pull/4335)
* Improve suggestion for `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
* Improve suggestion for `single_char_literal` [#4361](https://github.com/rust-lang/rust-clippy/pull/4361)
* Improve suggestion for `len_zero` [#4314](https://github.com/rust-lang/rust-clippy/pull/4314)
* Fix ICE in `implicit_hasher` [#4268](https://github.com/rust-lang/rust-clippy/pull/4268)
* Fix allow bug in `trivially_copy_pass_by_ref` [#4250](https://github.com/rust-lang/rust-clippy/pull/4250)

## Rust 1.37

Released 2019-08-15

[082cfa7...e3cb40e](https://github.com/rust-lang/rust-clippy/compare/082cfa7...e3cb40e)

* New Lints:
  * [`checked_conversions`] [#4088](https://github.com/rust-lang/rust-clippy/pull/4088)
  * [`get_last_with_len`] [#3832](https://github.com/rust-lang/rust-clippy/pull/3832)
  * [`integer_division`] [#4195](https://github.com/rust-lang/rust-clippy/pull/4195)
* Renamed Lint: `const_static_lifetime` is now called [`redundant_static_lifetimes`].
  The lint now covers statics in addition to consts [#4162](https://github.com/rust-lang/rust-clippy/pull/4162)
* [`match_same_arms`] now warns for all identical arms, instead of only the first one [#4102](https://github.com/rust-lang/rust-clippy/pull/4102)
* [`needless_return`] now works with void functions [#4220](https://github.com/rust-lang/rust-clippy/pull/4220)
* Fix false positive in [`redundant_closure`] [#4190](https://github.com/rust-lang/rust-clippy/pull/4190)
* Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107)
* Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214)
* Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136)
* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164)
* Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119)
* Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137)
* Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071)
* Add macro check for [`unreadable_literal`] [#4099](https://github.com/rust-lang/rust-clippy/pull/4099)

## Rust 1.36

Released 2019-07-04

[eb9f9b1...082cfa7](https://github.com/rust-lang/rust-clippy/compare/eb9f9b1...082cfa7)

* New lints: [`find_map`], [`filter_map_next`] [#4039](https://github.com/rust-lang/rust-clippy/pull/4039)
* New lint: [`path_buf_push_overwrite`] [#3954](https://github.com/rust-lang/rust-clippy/pull/3954)
* Move `path_buf_push_overwrite` to the nursery [#4013](https://github.com/rust-lang/rust-clippy/pull/4013)
* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
* Allow allowing of [`toplevel_ref_arg`] lint [#4007](https://github.com/rust-lang/rust-clippy/pull/4007)
* Fix false negative in [`or_fun_call`] pertaining to nested constructors [#4084](https://github.com/rust-lang/rust-clippy/pull/4084)
* Fix false positive in [`or_fun_call`] pertaining to enum variant constructors [#4018](https://github.com/rust-lang/rust-clippy/pull/4018)
* Fix false positive in [`useless_let_if_seq`] pertaining to interior mutability [#4035](https://github.com/rust-lang/rust-clippy/pull/4035)
* Fix false positive in [`redundant_closure`] pertaining to non-function types [#4008](https://github.com/rust-lang/rust-clippy/pull/4008)
* Fix false positive in [`let_and_return`] pertaining to attributes on `let`s [#4024](https://github.com/rust-lang/rust-clippy/pull/4024)
* Fix false positive in [`module_name_repetitions`] lint pertaining to attributes [#4006](https://github.com/rust-lang/rust-clippy/pull/4006)
* Fix false positive on [`assertions_on_constants`] pertaining to `debug_assert!` [#3989](https://github.com/rust-lang/rust-clippy/pull/3989)
* Improve suggestion in [`map_clone`] to suggest `.copied()` where applicable  [#3970](https://github.com/rust-lang/rust-clippy/pull/3970) [#4043](https://github.com/rust-lang/rust-clippy/pull/4043)
* Improve suggestion for [`search_is_some`] [#4049](https://github.com/rust-lang/rust-clippy/pull/4049)
* Improve suggestion applicability for [`naive_bytecount`] [#3984](https://github.com/rust-lang/rust-clippy/pull/3984)
* Improve suggestion applicability for [`while_let_loop`] [#3975](https://github.com/rust-lang/rust-clippy/pull/3975)
* Improve diagnostics for [`too_many_arguments`] [#4053](https://github.com/rust-lang/rust-clippy/pull/4053)
* Improve diagnostics for [`cast_lossless`] [#4021](https://github.com/rust-lang/rust-clippy/pull/4021)
* Deal with macro checks in desugarings better [#4082](https://github.com/rust-lang/rust-clippy/pull/4082)
* Add macro check for [`unnecessary_cast`]  [#4026](https://github.com/rust-lang/rust-clippy/pull/4026)
* Remove [`approx_constant`]'s documentation's "Known problems" section. [#4027](https://github.com/rust-lang/rust-clippy/pull/4027)
* Fix ICE in [`suspicious_else_formatting`] [#3960](https://github.com/rust-lang/rust-clippy/pull/3960)
* Fix ICE in [`decimal_literal_representation`] [#3931](https://github.com/rust-lang/rust-clippy/pull/3931)


## Rust 1.35

Released 2019-05-20

[1fac380..37f5c1e](https://github.com/rust-lang/rust-clippy/compare/1fac380...37f5c1e)

* New lint: `drop_bounds` to detect `T: Drop` bounds
* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
* Rename `cyclomatic_complexity` to [`cognitive_complexity`], start work on making lint more practical for Rust code
* Move [`get_unwrap`] to the restriction category
* Improve suggestions for [`iter_cloned_collect`]
* Improve suggestions for [`cast_lossless`] to suggest suffixed literals
* Fix false positives in [`print_with_newline`] and [`write_with_newline`] pertaining to raw strings
* Fix false positive in [`needless_range_loop`] pertaining to structs without a `.iter()`
* Fix false positive in [`bool_comparison`] pertaining to non-bool types
* Fix false positive in [`redundant_closure`] pertaining to differences in borrows
* Fix false positive in `option_map_unwrap_or` on non-copy types
* Fix false positives in [`missing_const_for_fn`] pertaining to macros and trait method impls
* Fix false positive in [`needless_pass_by_value`] pertaining to procedural macros
* Fix false positive in [`needless_continue`] pertaining to loop labels
* Fix false positive for [`boxed_local`] pertaining to arguments moved into closures
* Fix false positive for [`use_self`] in nested functions
* Fix suggestion for [`expect_fun_call`] (https://github.com/rust-lang/rust-clippy/pull/3846)
* Fix suggestion for [`explicit_counter_loop`] to deal with parenthesizing range variables
* Fix suggestion for [`single_char_pattern`] to correctly escape single quotes
* Avoid triggering [`redundant_closure`] in macros
* ICE fixes: [#3805](https://github.com/rust-lang/rust-clippy/pull/3805), [#3772](https://github.com/rust-lang/rust-clippy/pull/3772), [#3741](https://github.com/rust-lang/rust-clippy/pull/3741)

## Rust 1.34

Released 2019-04-10

[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/1b89724...1fac380)

* New lint: [`assertions_on_constants`] to detect for example `assert!(true)`
* New lint: [`dbg_macro`] to detect uses of the `dbg!` macro
* New lint: [`missing_const_for_fn`] that can suggest functions to be made `const`
* New lint: [`too_many_lines`] to detect functions with excessive LOC. It can be
  configured using the `too-many-lines-threshold` configuration.
* New lint: [`wildcard_enum_match_arm`] to check for wildcard enum matches using `_`
* Expand `redundant_closure` to also work for methods (not only functions)
* Fix ICEs in `vec_box`, `needless_pass_by_value` and `implicit_hasher`
* Fix false positive in `cast_sign_loss`
* Fix false positive in `integer_arithmetic`
* Fix false positive in `unit_arg`
* Fix false positives in `implicit_return`
* Add suggestion to `explicit_write`
* Improve suggestions for `question_mark` lint
* Fix incorrect suggestion for `cast_lossless`
* Fix incorrect suggestion for `expect_fun_call`
* Fix incorrect suggestion for `needless_bool`
* Fix incorrect suggestion for `needless_range_loop`
* Fix incorrect suggestion for `use_self`
* Fix incorrect suggestion for `while_let_on_iterator`
* Clippy is now slightly easier to invoke in non-cargo contexts. See
  [#3665][pull3665] for more details.
* We now have [improved documentation][adding_lints] on how to add new lints

## Rust 1.33

Released 2019-02-26

[b2601be...1b89724](https://github.com/rust-lang/rust-clippy/compare/b2601be...1b89724)

* New lints: [`implicit_return`], [`vec_box`], [`cast_ref_to_mut`]
* The `rust-clippy` repository is now part of the `rust-lang` org.
* Rename `stutter` to `module_name_repetitions`
* Merge `new_without_default_derive` into `new_without_default` lint
* Move `large_digit_groups` from `style` group to `pedantic`
* Expand `bool_comparison` to check for `<`, `<=`, `>`, `>=`, and `!=`
  comparisons against booleans
* Expand `no_effect` to detect writes to constants such as `A_CONST.field = 2`
* Expand `redundant_clone` to work on struct fields
* Expand `suspicious_else_formatting` to detect `if .. {..} {..}`
* Expand `use_self` to work on tuple structs and also in local macros
* Fix ICE in `result_map_unit_fn` and `option_map_unit_fn`
* Fix false positives in `implicit_return`
* Fix false positives in `use_self`
* Fix false negative in `clone_on_copy`
* Fix false positive in `doc_markdown`
* Fix false positive in `empty_loop`
* Fix false positive in `if_same_then_else`
* Fix false positive in `infinite_iter`
* Fix false positive in `question_mark`
* Fix false positive in `useless_asref`
* Fix false positive in `wildcard_dependencies`
* Fix false positive in `write_with_newline`
* Add suggestion to `explicit_write`
* Improve suggestions for `question_mark` lint
* Fix incorrect suggestion for `get_unwrap`

## Rust 1.32

Released 2019-01-17

[2e26fdc2...b2601be](https://github.com/rust-lang/rust-clippy/compare/2e26fdc2...b2601be)

* New lints: [`slow_vector_initialization`], `mem_discriminant_non_enum`,
  [`redundant_clone`], [`wildcard_dependencies`],
  [`into_iter_on_ref`], `into_iter_on_array`, [`deprecated_cfg_attr`],
  [`cargo_common_metadata`]
* Add support for `u128` and `i128` to integer related lints
* Add float support to `mistyped_literal_suffixes`
* Fix false positives in `use_self`
* Fix false positives in `missing_comma`
* Fix false positives in `new_ret_no_self`
* Fix false positives in `possible_missing_comma`
* Fix false positive in `integer_arithmetic` in constant items
* Fix false positive in `needless_borrow`
* Fix false positive in `out_of_bounds_indexing`
* Fix false positive in `new_without_default_derive`
* Fix false positive in `string_lit_as_bytes`
* Fix false negative in `out_of_bounds_indexing`
* Fix false negative in `use_self`. It will now also check existential types
* Fix incorrect suggestion for `redundant_closure_call`
* Fix various suggestions that contained expanded macros
* Fix `bool_comparison` triggering 3 times on on on the same code
* Expand `trivially_copy_pass_by_ref` to work on trait methods
* Improve suggestion for `needless_range_loop`
* Move `needless_pass_by_value` from `pedantic` group to `style`

## Rust 1.31

Released 2018-12-06

[125907ad..2e26fdc2](https://github.com/rust-lang/rust-clippy/compare/125907ad..2e26fdc2)

* Clippy has been relicensed under a dual MIT / Apache license.
  See [#3093](https://github.com/rust-lang/rust-clippy/issues/3093) for more
  information.
* With Rust 1.31, Clippy is no longer available via crates.io. The recommended
  installation method is via `rustup component add clippy`.
* New lints: [`redundant_pattern_matching`], [`unnecessary_filter_map`],
  [`unused_unit`], [`map_flatten`], [`mem_replace_option_with_none`]
* Fix ICE in `if_let_redundant_pattern_matching`
* Fix ICE in `needless_pass_by_value` when encountering a generic function
  argument with a lifetime parameter
* Fix ICE in `needless_range_loop`
* Fix ICE in `single_char_pattern` when encountering a constant value
* Fix false positive in `assign_op_pattern`
* Fix false positive in `boxed_local` on trait implementations
* Fix false positive in `cmp_owned`
* Fix false positive in `collapsible_if` when conditionals have comments
* Fix false positive in `double_parens`
* Fix false positive in `excessive_precision`
* Fix false positive in `explicit_counter_loop`
* Fix false positive in `fn_to_numeric_cast_with_truncation`
* Fix false positive in `map_clone`
* Fix false positive in `new_ret_no_self`
* Fix false positive in `new_without_default` when `new` is unsafe
* Fix false positive in `type_complexity` when using extern types
* Fix false positive in `useless_format`
* Fix false positive in `wrong_self_convention`
* Fix incorrect suggestion for `excessive_precision`
* Fix incorrect suggestion for `expect_fun_call`
* Fix incorrect suggestion for `get_unwrap`
* Fix incorrect suggestion for `useless_format`
* `fn_to_numeric_cast_with_truncation` lint can be disabled again
* Improve suggestions for `manual_memcpy`
* Improve help message for `needless_lifetimes`

## Rust 1.30

Released 2018-10-25

[14207503...125907ad](https://github.com/rust-lang/rust-clippy/compare/14207503...125907ad)

* Deprecate `assign_ops` lint
* New lints: [`mistyped_literal_suffixes`], [`ptr_offset_with_cast`],
  [`needless_collect`], [`copy_iterator`]
* `cargo clippy -V` now includes the Clippy commit hash of the Rust
  Clippy component
* Fix ICE in `implicit_hasher`
* Fix ICE when encountering `println!("{}" a);`
* Fix ICE when encountering a macro call in match statements
* Fix false positive in `default_trait_access`
* Fix false positive in `trivially_copy_pass_by_ref`
* Fix false positive in `similar_names`
* Fix false positive in `redundant_field_name`
* Fix false positive in `expect_fun_call`
* Fix false negative in `identity_conversion`
* Fix false negative in `explicit_counter_loop`
* Fix `range_plus_one` suggestion and false negative
* `print_with_newline` / `write_with_newline`: don't warn about string with several `\n`s in them
* Fix `useless_attribute` to also whitelist `unused_extern_crates`
* Fix incorrect suggestion for `single_char_pattern`
* Improve suggestion for `identity_conversion` lint
* Move `explicit_iter_loop` and `explicit_into_iter_loop` from `style` group to `pedantic`
* Move `range_plus_one` and `range_minus_one` from `nursery` group to `complexity`
* Move `shadow_unrelated` from `restriction` group to `pedantic`
* Move `indexing_slicing` from `pedantic` group to `restriction`

## Rust 1.29

Released 2018-09-13

[v0.0.212...14207503](https://github.com/rust-lang/rust-clippy/compare/v0.0.212...14207503)

* :tada: :tada: **Rust 1.29 is the first stable Rust that includes a bundled Clippy** :tada:
  :tada:
  You can now run `rustup component add clippy-preview` and then `cargo
  clippy` to run Clippy. This should put an end to the continuous nightly
  upgrades for Clippy users.
* Clippy now follows the Rust versioning scheme instead of its own
* Fix ICE when encountering a `while let (..) = x.iter()` construct
* Fix false positives in `use_self`
* Fix false positive in `trivially_copy_pass_by_ref`
* Fix false positive in `useless_attribute` lint
* Fix false positive in `print_literal`
* Fix `use_self` regressions
* Improve lint message for `neg_cmp_op_on_partial_ord`
* Improve suggestion highlight for `single_char_pattern`
* Improve suggestions for various print/write macro lints
* Improve website header

## 0.0.212 (2018-07-10)
* Rustup to *rustc 1.29.0-nightly (e06c87544 2018-07-06)*

## 0.0.211
* Rustup to *rustc 1.28.0-nightly (e3bf634e0 2018-06-28)*

## 0.0.210
* Rustup to *rustc 1.28.0-nightly (01cc982e9 2018-06-24)*

## 0.0.209
* Rustup to *rustc 1.28.0-nightly (523097979 2018-06-18)*

## 0.0.208
* Rustup to *rustc 1.28.0-nightly (86a8f1a63 2018-06-17)*

## 0.0.207
* Rustup to *rustc 1.28.0-nightly (2a0062974 2018-06-09)*

## 0.0.206
* Rustup to *rustc 1.28.0-nightly (5bf68db6e 2018-05-28)*

## 0.0.205
* Rustup to *rustc 1.28.0-nightly (990d8aa74 2018-05-25)*
* Rename `unused_lifetimes` to `extra_unused_lifetimes` because of naming conflict with new rustc lint

## 0.0.204
* Rustup to *rustc 1.28.0-nightly (71e87be38 2018-05-22)*

## 0.0.203
* Rustup to *rustc 1.28.0-nightly (a3085756e 2018-05-19)*
* Clippy attributes are now of the form `clippy::cyclomatic_complexity` instead of `clippy(cyclomatic_complexity)`

## 0.0.202
* Rustup to *rustc 1.28.0-nightly (952f344cd 2018-05-18)*

## 0.0.201
* Rustup to *rustc 1.27.0-nightly (2f2a11dfc 2018-05-16)*

## 0.0.200
* Rustup to *rustc 1.27.0-nightly (9fae15374 2018-05-13)*

## 0.0.199
* Rustup to *rustc 1.27.0-nightly (ff2ac35db 2018-05-12)*

## 0.0.198
* Rustup to *rustc 1.27.0-nightly (acd3871ba 2018-05-10)*

## 0.0.197
* Rustup to *rustc 1.27.0-nightly (428ea5f6b 2018-05-06)*

## 0.0.196
* Rustup to *rustc 1.27.0-nightly (e82261dfb 2018-05-03)*

## 0.0.195
* Rustup to *rustc 1.27.0-nightly (ac3c2288f 2018-04-18)*

## 0.0.194
* Rustup to *rustc 1.27.0-nightly (bd40cbbe1 2018-04-14)*
* New lints: [`cast_ptr_alignment`], [`transmute_ptr_to_ptr`], [`write_literal`], [`write_with_newline`], [`writeln_empty_string`]

## 0.0.193
* Rustup to *rustc 1.27.0-nightly (eeea94c11 2018-04-06)*

## 0.0.192
* Rustup to *rustc 1.27.0-nightly (fb44b4c0e 2018-04-04)*
* New lint: [`print_literal`]

## 0.0.191
* Rustup to *rustc 1.26.0-nightly (ae544ee1c 2018-03-29)*
* Lint audit; categorize lints as style, correctness, complexity, pedantic, nursery, restriction.

## 0.0.190
* Fix a bunch of intermittent cargo bugs

## 0.0.189
* Rustup to *rustc 1.26.0-nightly (5508b2714 2018-03-18)*

## 0.0.188
* Rustup to *rustc 1.26.0-nightly (392645394 2018-03-15)*
* New lint: [`while_immutable_condition`]

## 0.0.187
* Rustup to *rustc 1.26.0-nightly (322d7f7b9 2018-02-25)*
* New lints: [`redundant_field_names`], [`suspicious_arithmetic_impl`], [`suspicious_op_assign_impl`]

## 0.0.186
* Rustup to *rustc 1.25.0-nightly (0c6091fbd 2018-02-04)*
* Various false positive fixes

## 0.0.185
* Rustup to *rustc 1.25.0-nightly (56733bc9f 2018-02-01)*
* New lint: [`question_mark`]

## 0.0.184
* Rustup to *rustc 1.25.0-nightly (90eb44a58 2018-01-29)*
* New lints: [`double_comparisons`], [`empty_line_after_outer_attr`]

## 0.0.183
* Rustup to *rustc 1.25.0-nightly (21882aad7 2018-01-28)*
* New lint: [`misaligned_transmute`]

## 0.0.182
* Rustup to *rustc 1.25.0-nightly (a0dcecff9 2018-01-24)*
* New lint: [`decimal_literal_representation`]

## 0.0.181
* Rustup to *rustc 1.25.0-nightly (97520ccb1 2018-01-21)*
* New lints: [`else_if_without_else`], [`option_option`], [`unit_arg`], [`unnecessary_fold`]
* Removed `unit_expr`
* Various false positive fixes for [`needless_pass_by_value`]

## 0.0.180
* Rustup to *rustc 1.25.0-nightly (3f92e8d89 2018-01-14)*

## 0.0.179
* Rustup to *rustc 1.25.0-nightly (61452e506 2018-01-09)*

## 0.0.178
* Rustup to *rustc 1.25.0-nightly (ee220daca 2018-01-07)*

## 0.0.177
* Rustup to *rustc 1.24.0-nightly (250b49205 2017-12-21)*
* New lint: [`match_as_ref`]

## 0.0.176
* Rustup to *rustc 1.24.0-nightly (0077d128d 2017-12-14)*

## 0.0.175
* Rustup to *rustc 1.24.0-nightly (bb42071f6 2017-12-01)*

## 0.0.174
* Rustup to *rustc 1.23.0-nightly (63739ab7b 2017-11-21)*

## 0.0.173
* Rustup to *rustc 1.23.0-nightly (33374fa9d 2017-11-20)*

## 0.0.172
* Rustup to *rustc 1.23.0-nightly (d0f8e2913 2017-11-16)*

## 0.0.171
* Rustup to *rustc 1.23.0-nightly (ff0f5de3b 2017-11-14)*

## 0.0.170
* Rustup to *rustc 1.23.0-nightly (d6b06c63a 2017-11-09)*

## 0.0.169
* Rustup to *rustc 1.23.0-nightly (3b82e4c74 2017-11-05)*
* New lints: [`just_underscores_and_digits`], `result_map_unwrap_or_else`, [`transmute_bytes_to_str`]

## 0.0.168
* Rustup to *rustc 1.23.0-nightly (f0fe716db 2017-10-30)*

## 0.0.167
* Rustup to *rustc 1.23.0-nightly (90ef3372e 2017-10-29)*
* New lints: `const_static_lifetime`, [`erasing_op`], [`fallible_impl_from`], [`println_empty_string`], [`useless_asref`]

## 0.0.166
* Rustup to *rustc 1.22.0-nightly (b7960878b 2017-10-18)*
* New lints: [`explicit_write`], `identity_conversion`, [`implicit_hasher`], `invalid_ref`, [`option_map_or_none`],
  [`range_minus_one`], [`range_plus_one`], [`transmute_int_to_bool`], [`transmute_int_to_char`],
  [`transmute_int_to_float`]

## 0.0.165
* Rust upgrade to rustc 1.22.0-nightly (0e6f4cf51 2017-09-27)
* New lint: [`mut_range_bound`]

## 0.0.164
* Update to *rustc 1.22.0-nightly (6c476ce46 2017-09-25)*
* New lint: [`int_plus_one`]

## 0.0.163
* Update to *rustc 1.22.0-nightly (14039a42a 2017-09-22)*

## 0.0.162
* Update to *rustc 1.22.0-nightly (0701b37d9 2017-09-18)*
* New lint: [`chars_last_cmp`]
* Improved suggestions for [`needless_borrow`], [`ptr_arg`],

## 0.0.161
* Update to *rustc 1.22.0-nightly (539f2083d 2017-09-13)*

## 0.0.160
* Update to *rustc 1.22.0-nightly (dd08c3070 2017-09-12)*

## 0.0.159
* Update to *rustc 1.22.0-nightly (eba374fb2 2017-09-11)*
* New lint: [`clone_on_ref_ptr`]

## 0.0.158
* New lint: [`manual_memcpy`]
* [`cast_lossless`] no longer has redundant parentheses in its suggestions
* Update to *rustc 1.22.0-nightly (dead08cb3 2017-09-08)*

## 0.0.157 - 2017-09-04
* Update to *rustc 1.22.0-nightly (981ce7d8d 2017-09-03)*
* New lint: `unit_expr`

## 0.0.156 - 2017-09-03
* Update to *rustc 1.22.0-nightly (744dd6c1d 2017-09-02)*

## 0.0.155
* Update to *rustc 1.21.0-nightly (c11f689d2 2017-08-29)*
* New lint: [`infinite_iter`], [`maybe_infinite_iter`], [`cast_lossless`]

## 0.0.154
* Update to *rustc 1.21.0-nightly (2c0558f63 2017-08-24)*
* Fix [`use_self`] triggering inside derives
* Add support for linting an entire workspace with `cargo clippy --all`
* New lint: [`naive_bytecount`]

## 0.0.153
* Update to *rustc 1.21.0-nightly (8c303ed87 2017-08-20)*
* New lint: [`use_self`]

## 0.0.152
* Update to *rustc 1.21.0-nightly (df511d554 2017-08-14)*

## 0.0.151
* Update to *rustc 1.21.0-nightly (13d94d5fa 2017-08-10)*

## 0.0.150
* Update to *rustc 1.21.0-nightly (215e0b10e 2017-08-08)*

## 0.0.148
* Update to *rustc 1.21.0-nightly (37c7d0ebb 2017-07-31)*
* New lints: [`unreadable_literal`], [`inconsistent_digit_grouping`], [`large_digit_groups`]

## 0.0.147
* Update to *rustc 1.21.0-nightly (aac223f4f 2017-07-30)*

## 0.0.146
* Update to *rustc 1.21.0-nightly (52a330969 2017-07-27)*
* Fixes false positives in `inline_always`
* Fixes false negatives in `panic_params`

## 0.0.145
* Update to *rustc 1.20.0-nightly (afe145d22 2017-07-23)*

## 0.0.144
* Update to *rustc 1.20.0-nightly (086eaa78e 2017-07-15)*

## 0.0.143
* Update to *rustc 1.20.0-nightly (d84693b93 2017-07-09)*
* Fix `cargo clippy` crashing on `dylib` projects
* Fix false positives around `nested_while_let` and `never_loop`

## 0.0.142
* Update to *rustc 1.20.0-nightly (067971139 2017-07-02)*

## 0.0.141
* Rewrite of the `doc_markdown` lint.
* Deprecated [`range_step_by_zero`]
* New lint: [`iterator_step_by_zero`]
* New lint: [`needless_borrowed_reference`]
* Update to *rustc 1.20.0-nightly (69c65d296 2017-06-28)*

## 0.0.140 - 2017-06-16
* Update to *rustc 1.19.0-nightly (258ae6dd9 2017-06-15)*

## 0.0.139 — 2017-06-10
* Update to *rustc 1.19.0-nightly (4bf5c99af 2017-06-10)*
* Fix bugs with for loop desugaring
* Check for [`AsRef`]/[`AsMut`] arguments in [`wrong_self_convention`]

## 0.0.138 — 2017-06-05
* Update to *rustc 1.19.0-nightly (0418fa9d3 2017-06-04)*

## 0.0.137 — 2017-06-05
* Update to *rustc 1.19.0-nightly (6684d176c 2017-06-03)*

## 0.0.136 — 2017—05—26
* Update to *rustc 1.19.0-nightly (557967766 2017-05-26)*

## 0.0.135 — 2017—05—24
* Update to *rustc 1.19.0-nightly (5b13bff52 2017-05-23)*

## 0.0.134 — 2017—05—19
* Update to *rustc 1.19.0-nightly (0ed1ec9f9 2017-05-18)*

## 0.0.133 — 2017—05—14
* Update to *rustc 1.19.0-nightly (826d8f385 2017-05-13)*

## 0.0.132 — 2017—05—05
* Fix various bugs and some ices

## 0.0.131 — 2017—05—04
* Update to *rustc 1.19.0-nightly (2d4ed8e0c 2017-05-03)*

## 0.0.130 — 2017—05—03
* Update to *rustc 1.19.0-nightly (6a5fc9eec 2017-05-02)*

## 0.0.129 — 2017-05-01
* Update to *rustc 1.19.0-nightly (06fb4d256 2017-04-30)*

## 0.0.128 — 2017-04-28
* Update to *rustc 1.18.0-nightly (94e884b63 2017-04-27)*

## 0.0.127 — 2017-04-27
* Update to *rustc 1.18.0-nightly (036983201 2017-04-26)*
* New lint: [`needless_continue`]

## 0.0.126 — 2017-04-24
* Update to *rustc 1.18.0-nightly (2bd4b5c6d 2017-04-23)*

## 0.0.125 — 2017-04-19
* Update to *rustc 1.18.0-nightly (9f2abadca 2017-04-18)*

## 0.0.124 — 2017-04-16
* Update to *rustc 1.18.0-nightly (d5cf1cb64 2017-04-15)*

## 0.0.123 — 2017-04-07
* Fix various false positives

## 0.0.122 — 2017-04-07
* Rustup to *rustc 1.18.0-nightly (91ae22a01 2017-04-05)*
* New lint: [`op_ref`]

## 0.0.121 — 2017-03-21
* Rustup to *rustc 1.17.0-nightly (134c4a0f0 2017-03-20)*

## 0.0.120 — 2017-03-17
* Rustup to *rustc 1.17.0-nightly (0aeb9c129 2017-03-15)*

## 0.0.119 — 2017-03-13
* Rustup to *rustc 1.17.0-nightly (824c9ebbd 2017-03-12)*

## 0.0.118 — 2017-03-05
* Rustup to *rustc 1.17.0-nightly (b1e31766d 2017-03-03)*

## 0.0.117 — 2017-03-01
* Rustup to *rustc 1.17.0-nightly (be760566c 2017-02-28)*

## 0.0.116 — 2017-02-28
* Fix `cargo clippy` on 64 bit windows systems

## 0.0.115 — 2017-02-27
* Rustup to *rustc 1.17.0-nightly (60a0edc6c 2017-02-26)*
* New lints: [`zero_ptr`], [`never_loop`], [`mut_from_ref`]

## 0.0.114 — 2017-02-08
* Rustup to *rustc 1.17.0-nightly (c49d10207 2017-02-07)*
* Tests are now ui tests (testing the exact output of rustc)

## 0.0.113 — 2017-02-04
* Rustup to *rustc 1.16.0-nightly (eedaa94e3 2017-02-02)*
* New lint: [`large_enum_variant`]
* `explicit_into_iter_loop` provides suggestions

## 0.0.112 — 2017-01-27
* Rustup to *rustc 1.16.0-nightly (df8debf6d 2017-01-25)*

## 0.0.111 — 2017-01-21
* Rustup to *rustc 1.16.0-nightly (a52da95ce 2017-01-20)*

## 0.0.110 — 2017-01-20
* Add badges and categories to `Cargo.toml`

## 0.0.109 — 2017-01-19
* Update to *rustc 1.16.0-nightly (c07a6ae77 2017-01-17)*

## 0.0.108 — 2017-01-12
* Update to *rustc 1.16.0-nightly (2782e8f8f 2017-01-12)*

## 0.0.107 — 2017-01-11
* Update regex dependency
* Fix FP when matching `&&mut` by `&ref`
* Reintroduce `for (_, x) in &mut hash_map` -> `for x in hash_map.values_mut()`
* New lints: [`unused_io_amount`], [`forget_ref`], [`short_circuit_statement`]

## 0.0.106 — 2017-01-04
* Fix FP introduced by rustup in [`wrong_self_convention`]

## 0.0.105 — 2017-01-04
* Update to *rustc 1.16.0-nightly (468227129 2017-01-03)*
* New lints: [`deref_addrof`], [`double_parens`], [`pub_enum_variant_names`]
* Fix suggestion in [`new_without_default`]
* FP fix in [`absurd_extreme_comparisons`]

## 0.0.104 — 2016-12-15
* Update to *rustc 1.15.0-nightly (8f02c429a 2016-12-15)*

## 0.0.103 — 2016-11-25
* Update to *rustc 1.15.0-nightly (d5814b03e 2016-11-23)*

## 0.0.102 — 2016-11-24
* Update to *rustc 1.15.0-nightly (3bf2be9ce 2016-11-22)*

## 0.0.101 — 2016-11-23
* Update to *rustc 1.15.0-nightly (7b3eeea22 2016-11-21)*
* New lint: [`string_extend_chars`]

## 0.0.100 — 2016-11-20
* Update to *rustc 1.15.0-nightly (ac635aa95 2016-11-18)*

## 0.0.99 — 2016-11-18
* Update to rustc 1.15.0-nightly (0ed951993 2016-11-14)
* New lint: [`get_unwrap`]

## 0.0.98 — 2016-11-08
* Fixes an issue due to a change in how cargo handles `--sysroot`, which broke `cargo clippy`

## 0.0.97 — 2016-11-03
* For convenience, `cargo clippy` defines a `cargo-clippy` feature. This was
  previously added for a short time under the name `clippy` but removed for
  compatibility.
* `cargo clippy --help` is more helping (and less helpful :smile:)
* Rustup to *rustc 1.14.0-nightly (5665bdf3e 2016-11-02)*
* New lints: [`if_let_redundant_pattern_matching`], [`partialeq_ne_impl`]

## 0.0.96 — 2016-10-22
* Rustup to *rustc 1.14.0-nightly (f09420685 2016-10-20)*
* New lint: [`iter_skip_next`]

## 0.0.95 — 2016-10-06
* Rustup to *rustc 1.14.0-nightly (3210fd5c2 2016-10-05)*

## 0.0.94 — 2016-10-04
* Fixes bustage on Windows due to forbidden directory name

## 0.0.93 — 2016-10-03
* Rustup to *rustc 1.14.0-nightly (144af3e97 2016-10-02)*
* `option_map_unwrap_or` and `option_map_unwrap_or_else` are now
  allowed by default.
* New lint: [`explicit_into_iter_loop`]

## 0.0.92 — 2016-09-30
* Rustup to *rustc 1.14.0-nightly (289f3a4ca 2016-09-29)*

## 0.0.91 — 2016-09-28
* Rustup to *rustc 1.13.0-nightly (d0623cf7b 2016-09-26)*

## 0.0.90 — 2016-09-09
* Rustup to *rustc 1.13.0-nightly (f1f40f850 2016-09-09)*

## 0.0.89 — 2016-09-06
* Rustup to *rustc 1.13.0-nightly (cbe4de78e 2016-09-05)*

## 0.0.88 — 2016-09-04
* Rustup to *rustc 1.13.0-nightly (70598e04f 2016-09-03)*
* The following lints are not new but were only usable through the `clippy`
  lint groups: [`filter_next`], `for_loop_over_option`,
  `for_loop_over_result` and [`match_overlapping_arm`]. You should now be
  able to `#[allow/deny]` them individually and they are available directly
  through `cargo clippy`.

## 0.0.87 — 2016-08-31
* Rustup to *rustc 1.13.0-nightly (eac41469d 2016-08-30)*
* New lints: [`builtin_type_shadow`]
* Fix FP in [`zero_prefixed_literal`] and `0b`/`0o`

## 0.0.86 — 2016-08-28
* Rustup to *rustc 1.13.0-nightly (a23064af5 2016-08-27)*
* New lints: [`missing_docs_in_private_items`], [`zero_prefixed_literal`]

## 0.0.85 — 2016-08-19
* Fix ICE with [`useless_attribute`]
* [`useless_attribute`] ignores `unused_imports` on `use` statements

## 0.0.84 — 2016-08-18
* Rustup to *rustc 1.13.0-nightly (aef6971ca 2016-08-17)*

## 0.0.83 — 2016-08-17
* Rustup to *rustc 1.12.0-nightly (1bf5fa326 2016-08-16)*
* New lints: [`print_with_newline`], [`useless_attribute`]

## 0.0.82 — 2016-08-17
* Rustup to *rustc 1.12.0-nightly (197be89f3 2016-08-15)*
* New lint: [`module_inception`]

## 0.0.81 — 2016-08-14
* Rustup to *rustc 1.12.0-nightly (1deb02ea6 2016-08-12)*
* New lints: [`eval_order_dependence`], [`mixed_case_hex_literals`], [`unseparated_literal_suffix`]
* False positive fix in [`too_many_arguments`]
* Addition of functionality to [`needless_borrow`]
* Suggestions for [`clone_on_copy`]
* Bug fix in [`wrong_self_convention`]
* Doc improvements

## 0.0.80 — 2016-07-31
* Rustup to *rustc 1.12.0-nightly (1225e122f 2016-07-30)*
* New lints: [`misrefactored_assign_op`], [`serde_api_misuse`]

## 0.0.79 — 2016-07-10
* Rustup to *rustc 1.12.0-nightly (f93aaf84c 2016-07-09)*
* Major suggestions refactoring

## 0.0.78 — 2016-07-02
* Rustup to *rustc 1.11.0-nightly (01411937f 2016-07-01)*
* New lints: [`wrong_transmute`], [`double_neg`], [`filter_map`]
* For compatibility, `cargo clippy` does not defines the `clippy` feature
  introduced in 0.0.76 anymore
* [`collapsible_if`] now considers `if let`

## 0.0.77 — 2016-06-21
* Rustup to *rustc 1.11.0-nightly (5522e678b 2016-06-20)*
* New lints: `stutter` and [`iter_nth`]

## 0.0.76 — 2016-06-10
* Rustup to *rustc 1.11.0-nightly (7d2f75a95 2016-06-09)*
* `cargo clippy` now automatically defines the `clippy` feature
* New lint: [`not_unsafe_ptr_arg_deref`]

## 0.0.75 — 2016-06-08
* Rustup to *rustc 1.11.0-nightly (763f9234b 2016-06-06)*

## 0.0.74 — 2016-06-07
* Fix bug with `cargo-clippy` JSON parsing
* Add the `CLIPPY_DISABLE_DOCS_LINKS` environment variable to deactivate the
  “for further information visit *lint-link*” message.

## 0.0.73 — 2016-06-05
* Fix false positives in [`useless_let_if_seq`]

## 0.0.72 — 2016-06-04
* Fix false positives in [`useless_let_if_seq`]

## 0.0.71 — 2016-05-31
* Rustup to *rustc 1.11.0-nightly (a967611d8 2016-05-30)*
* New lint: [`useless_let_if_seq`]

## 0.0.70 — 2016-05-28
* Rustup to *rustc 1.10.0-nightly (7bddce693 2016-05-27)*
* [`invalid_regex`] and [`trivial_regex`] can now warn on `RegexSet::new`,
  `RegexBuilder::new` and byte regexes

## 0.0.69 — 2016-05-20
* Rustup to *rustc 1.10.0-nightly (476fe6eef 2016-05-21)*
* [`used_underscore_binding`] has been made `Allow` temporarily

## 0.0.68 — 2016-05-17
* Rustup to *rustc 1.10.0-nightly (cd6a40017 2016-05-16)*
* New lint: [`unnecessary_operation`]

## 0.0.67 — 2016-05-12
* Rustup to *rustc 1.10.0-nightly (22ac88f1a 2016-05-11)*

## 0.0.66 — 2016-05-11
* New `cargo clippy` subcommand
* New lints: [`assign_op_pattern`], [`assign_ops`], [`needless_borrow`]

## 0.0.65 — 2016-05-08
* Rustup to *rustc 1.10.0-nightly (62e2b2fb7 2016-05-06)*
* New lints: [`float_arithmetic`], [`integer_arithmetic`]

## 0.0.64 — 2016-04-26
* Rustup to *rustc 1.10.0-nightly (645dd013a 2016-04-24)*
* New lints: `temporary_cstring_as_ptr`, [`unsafe_removed_from_name`], and [`mem_forget`]

## 0.0.63 — 2016-04-08
* Rustup to *rustc 1.9.0-nightly (7979dd608 2016-04-07)*

## 0.0.62 — 2016-04-07
* Rustup to *rustc 1.9.0-nightly (bf5da36f1 2016-04-06)*

## 0.0.61 — 2016-04-03
* Rustup to *rustc 1.9.0-nightly (5ab11d72c 2016-04-02)*
* New lint: [`invalid_upcast_comparisons`]

## 0.0.60 — 2016-04-01
* Rustup to *rustc 1.9.0-nightly (e1195c24b 2016-03-31)*

## 0.0.59 — 2016-03-31
* Rustup to *rustc 1.9.0-nightly (30a3849f2 2016-03-30)*
* New lints: [`logic_bug`], [`nonminimal_bool`]
* Fixed: [`match_same_arms`] now ignores arms with guards
* Improved: [`useless_vec`] now warns on `for … in vec![…]`

## 0.0.58 — 2016-03-27
* Rustup to *rustc 1.9.0-nightly (d5a91e695 2016-03-26)*
* New lint: [`doc_markdown`]

## 0.0.57 — 2016-03-27
* Update to *rustc 1.9.0-nightly (a1e29daf1 2016-03-25)*
* Deprecated lints: [`str_to_string`], [`string_to_string`], [`unstable_as_slice`], [`unstable_as_mut_slice`]
* New lint: [`crosspointer_transmute`]

## 0.0.56 — 2016-03-23
* Update to *rustc 1.9.0-nightly (0dcc413e4 2016-03-22)*
* New lints: [`many_single_char_names`] and [`similar_names`]

## 0.0.55 — 2016-03-21
* Update to *rustc 1.9.0-nightly (02310fd31 2016-03-19)*

## 0.0.54 — 2016-03-16
* Update to *rustc 1.9.0-nightly (c66d2380a 2016-03-15)*

## 0.0.53 — 2016-03-15
* Add a [configuration file]

## ~~0.0.52~~

## 0.0.51 — 2016-03-13
* Add `str` to types considered by [`len_zero`]
* New lints: [`indexing_slicing`]

## 0.0.50 — 2016-03-11
* Update to *rustc 1.9.0-nightly (c9629d61c 2016-03-10)*

## 0.0.49 — 2016-03-09
* Update to *rustc 1.9.0-nightly (eabfc160f 2016-03-08)*
* New lints: [`overflow_check_conditional`], `unused_label`, [`new_without_default`]

## 0.0.48 — 2016-03-07
* Fixed: ICE in [`needless_range_loop`] with globals

## 0.0.47 — 2016-03-07
* Update to *rustc 1.9.0-nightly (998a6720b 2016-03-07)*
* New lint: [`redundant_closure_call`]

[`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
[`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
[configuration file]: ./rust-clippy#configuration
[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/book/src/development/adding_lints.md
[`README.md`]: https://github.com/rust-lang/rust-clippy/blob/master/README.md

<!-- lint disable no-unused-definitions -->
<!-- begin autogenerated links to lint list -->
[`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons
[`alloc_instead_of_core`]: https://rust-lang.github.io/rust-clippy/master/index.html#alloc_instead_of_core
[`allow_attributes_without_reason`]: https://rust-lang.github.io/rust-clippy/master/index.html#allow_attributes_without_reason
[`almost_complete_letter_range`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_complete_letter_range
[`almost_swapped`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_swapped
[`approx_constant`]: https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[`arithmetic_side_effects`]: https://rust-lang.github.io/rust-clippy/master/index.html#arithmetic_side_effects
[`as_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_conversions
[`as_underscore`]: https://rust-lang.github.io/rust-clippy/master/index.html#as_underscore
[`assertions_on_constants`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_constants
[`assertions_on_result_states`]: https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states
[`assign_op_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[`assign_ops`]: https://rust-lang.github.io/rust-clippy/master/index.html#assign_ops
[`async_yields_async`]: https://rust-lang.github.io/rust-clippy/master/index.html#async_yields_async
[`await_holding_invalid_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_invalid_type
[`await_holding_lock`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_lock
[`await_holding_refcell_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#await_holding_refcell_ref
[`bad_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#bad_bit_mask
[`bind_instead_of_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#bind_instead_of_map
[`blacklisted_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#blacklisted_name
[`blanket_clippy_restriction_lints`]: https://rust-lang.github.io/rust-clippy/master/index.html#blanket_clippy_restriction_lints
[`block_in_if_condition_expr`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_expr
[`block_in_if_condition_stmt`]: https://rust-lang.github.io/rust-clippy/master/index.html#block_in_if_condition_stmt
[`blocks_in_if_conditions`]: https://rust-lang.github.io/rust-clippy/master/index.html#blocks_in_if_conditions
[`bool_assert_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_assert_comparison
[`bool_comparison`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[`bool_to_int_with_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#bool_to_int_with_if
[`borrow_as_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_as_ptr
[`borrow_deref_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_deref_ref
[`borrow_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrow_interior_mutable_const
[`borrowed_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[`box_collection`]: https://rust-lang.github.io/rust-clippy/master/index.html#box_collection
[`box_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
[`cast_slice_from_raw_parts`]: https://rust-lang.github.io/rust-clippy/master/index.html#cast_slice_from_raw_parts
[`char_lit_as_u8`]: https://rust-lang.github.io/rust-clippy/master/index.html#char_lit_as_u8
[`chars_last_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_last_cmp
[`chars_next_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#chars_next_cmp
[`checked_conversions`]: https://rust-lang.github.io/rust-clippy/master/index.html#checked_conversions
[`clone_double_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_double_ref
[`clone_on_copy`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[`clone_on_ref_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_ref_ptr
[`cloned_instead_of_copied`]: https://rust-lang.github.io/rust-clippy/master/index.html#cloned_instead_of_copied
[`cmp_nan`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_nan
[`cmp_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_null
[`cmp_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#cmp_owned
[`cognitive_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cognitive_complexity
[`collapsible_else_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_else_if
[`collapsible_if`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[`collapsible_match`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_match
[`collapsible_str_replace`]: https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_str_replace
[`comparison_chain`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_chain
[`comparison_to_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#comparison_to_empty
[`const_static_lifetime`]: https://rust-lang.github.io/rust-clippy/master/index.html#const_static_lifetime
[`copy_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#copy_iterator
[`crate_in_macro_def`]: https://rust-lang.github.io/rust-clippy/master/index.html#crate_in_macro_def
[`create_dir`]: https://rust-lang.github.io/rust-clippy/master/index.html#create_dir
[`crosspointer_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#crosspointer_transmute
[`cyclomatic_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[`dbg_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#dbg_macro
[`debug_assert_with_mut_call`]: https://rust-lang.github.io/rust-clippy/master/index.html#debug_assert_with_mut_call
[`decimal_literal_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#decimal_literal_representation
[`declare_interior_mutable_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#declare_interior_mutable_const
[`default_instead_of_iter_empty`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_instead_of_iter_empty
[`default_numeric_fallback`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_numeric_fallback
[`default_trait_access`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_trait_access
[`default_union_representation`]: https://rust-lang.github.io/rust-clippy/master/index.html#default_union_representation
[`deprecated_cfg_attr`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_cfg_attr
[`deprecated_semver`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_semver
[`deref_addrof`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
[`deref_by_slicing`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_by_slicing
[`derivable_impls`]: https://rust-lang.github.io/rust-clippy/master/index.html#derivable_impls
[`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
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