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## Unreleased / In Rust Nightly
[7bfc26e...master](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...master)
[b7f3f7f...master](https://github.com/rust-lang/rust-clippy/compare/b7f3f7f...master)
## Rust 1.57
Current beta, release 2021-12-02
[7bfc26e...b7f3f7f](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...b7f3f7f)
### 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)
* [`if_then_panic`] [#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_method`]: 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)
* [`if_then_panic`]: 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
Current beta, release 2021-10-21
Current stable, released 2021-10-21
[74d1561...7bfc26e](https://github.com/rust-lang/rust-clippy/compare/74d1561...7bfc26e)
@ -74,13 +225,9 @@ Current beta, release 2021-10-21
* [`unnested_or_patterns`]: Removed `or_patterns` feature gate in the code
example [#7507](https://github.com/rust-lang/rust-clippy/pull/7507)
### New Lints
* Renamed Lint: `if_let_some_result` is now called [`match_result_ok`]. Now also handles `while let` case.
## Rust 1.55
Current stable, released 2021-09-09
Released 2021-09-09
[3ae8faf...74d1561](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...74d1561)