mirror of https://github.com/rust-lang/rust-clippy synced 2024-11-22 12:43:18 +00:00

Robert Spencer acc3842d43 Add new map_with_unused_argument_over_ranges lint

This lint checks for code that looks like
```rust
  let something : Vec<_> = (0..100).map(|_| {
    1 + 2 + 3
  }).collect();
```
which is more clear as
```rust
  let something : Vec<_> = std::iter::repeat_with(|| {
    1 + 2 + 3
  }).take(100).collect();
```
or
```rust
  let something : Vec<_> =
      std::iter::repeat_n(1 + 2 + 3, 100)
      .collect();
```

That is, a map over a range which does nothing with the parameter
passed to it is simply a function (or closure) being called `n`
times and could be more semantically expressed using `take`.

2024-10-29 21:32:00 +00:00

354 KiB

Raw Blame History

Changelog

All notable changes to this project will be documented in this file. See Changelog Update if you want to update this document.

Unreleased / Beta / In Rust Nightly

0f8eabd6...master

Rust 1.82

Current stable, released 2024-10-17

View all 108 merged pull requests

New Lints

Added too_long_first_doc_paragraph to nursery #12993
Added unused_result_ok to restriction #12150
Added pathbuf_init_then_push to restriction #11700

Enhancements

explicit_iter_loop: Now respects the msrv configuration #13288
assigning_clones: No longer lints in test code #13273
inconsistent_struct_constructor: Lint attributes now work on the struct definition #13211
set_contains_or_insert: Now also checks for BTreeSet #13053
doc_markdown: Added the following identifiers to doc-valid-idents: AccessKit, CoreFoundation, CoreGraphics, CoreText, Direct2D, Direct3D, DirectWrite, PostScript, OpenAL, OpenType, WebRTC, WebSocket, WebTransport, NetBSD, and OpenBSD #13093

ICE Fixes

uninit_vec rust#128720

Rust 1.81

Released 2024-09-05

New Lints

Added cfg_not_test to restriction #11293
Added byte_char_slices to style #10155
Added set_contains_or_insert to nursery #12873
Added manual_rotate to style #12983
Added unnecessary_min_or_max to complexity #12368
Added manual_inspect to complexity #12287
Added field_scoped_visibility_modifiers to restriction #12893
Added manual_pattern_char_comparison to style #12849
Added needless_maybe_sized to suspicious #10632
Added needless_character_iteration to suspicious #12815

Moves and Deprecations

allow_attributes, allow_attributes_without_reason: Now work on stable rust#120924
Renamed overflow_check_conditional to panicking_overflow_checks #12944
Moved panicking_overflow_checks to correctness (From complexity now deny-by-default) #12944
Renamed thread_local_initializer_can_be_made_const to missing_const_for_thread_local #12974
Deprecated maybe_misused_cfg and mismatched_target_os as they are now caught by cargo and rustc #12875

Enhancements

significant_drop_in_scrutinee: Now also checks scrutinies of while let and for let expressions #12870
std_instead_of_core: Now respects the msrv configuration #13168

ICE Fixes

suboptimal_flops: No longer crashes on custom .log() functions #12884

Rust 1.80

Current stable, released 2024-07-25

View all 68 merged pull requests

New Lints

Added while_float to nursery #12765
Added macro_metavars_in_unsafe to suspicious #12107
Added renamed_function_params to restriction #11540
Added doc_lazy_continuation to style #12770

Moves and Deprecations

Moved assigning_clones to pedantic (From perf now allow-by-default) #12779
Moved single_char_pattern to pedantic (From perf now allow-by-default) #11852

Enhancements

panic: Added allow-panic-in-tests configuration to allow the lint in tests #12803
missing_const_for_fn: Now respects the msrv configuration #12713
missing_panics_doc: No longer lints on compile-time panics #12790
collapsible_match: Now considers the msrv configuration for the suggestion #12745
useless_vec: Added allow-useless-vec-in-tests configuration to allow the lint in tests #12725

Suggestion Fixes/Improvements

single_match, single_match_else: Suggestions are now machine-applicable #12726

Rust 1.79

Released 2024-06-13

View all 102 merged pull requests

New Lints

Added legacy_numeric_constants to style #12312
Added missing_transmute_annotations to suspicious #12239
Added integer_division_remainder_used to restriction #12451
Added duplicated_attributes to suspicious #12378
Added manual_unwrap_or_default to suspicious #12440
Added zero_repeat_side_effects to suspicious #12449
Added const_is_empty to suspicious #12310

Moves and Deprecations

Moved box_default to style (From perf) #12601
Moved manual_clamp to complexity (From nursery now warn-by-default) #12543
Moved readonly_write_lock to perf (From nursery now warn-by-default) #12479

Enhancements

module_name_repetitions: Added the allowed-prefixes configuration to allow common prefixes. #12573
cast_sign_loss, cast_possible_truncation, cast_lossless: Are now allowed in macros #12631
manual_clamp: Now only lints on constant min and max values #12543
assigning_clones: Now considers the msrv configuration #12511
needless_return, useless_let_if_seq, mut_mut, read_zero_byte_vec, unused_io_amount, unused_peekable: Now respects #[allow] attributes on the affected statement instead #12446

False Positive Fixes

cast_lossless: No longer lints when casting to u128 #12496
std_instead_of_core No longer lints on modules that are only in std #12447

ICE Fixes

needless_return: No longer crashes on non-ascii characters #12493

Rust 1.78

Released 2024-05-02

View all 112 merged pull requests

New Lints

Enhancements

thread_local_initializer_can_be_made_const: Now checks the msrv configuration #12405
disallowed_macros: Code generated by derive macros can no longer allow this lint #12267
wildcard_imports: Add configuration allowed-wildcard-imports to allow preconfigured wildcards #11979

ICE Fixes

ptr_as_ptr: No longer ICEs when the cast source is a function call to a local variable #12617
cast_sign_loss: Avoids an infinite loop when casting two chained .unwrap() calls #12508

Rust 1.77

Released 2024-03-18

View all 93 merged pull requests

New Lints

Enhancements

multiple_crate_versions: Added the allowed-duplicate-crates configuration to allow specific crates #12179
single_call_fn: No longer ignores #[allow] attributes #12183
read_zero_byte_vec: Updated the heuristics used for linting #11766

ICE Fixes

unit_arg: No longer crashes when checking for const in nested bodies #11977
indexing_slicing: No longer crashes when the array index exceeds usize #12266

Others

Warnings about invalid fields inside clippy.toml files now include suggestions for existing fields #12180

Rust 1.76

Released 2024-02-08

View all 85 merged pull requests

New Lints

Moves and Deprecations

Renamed blocks_in_if_conditions to blocks_in_conditions #11853
Moved implied_bounds_in_impls to complexity (Now warn-by-default) #11867
Moved if_same_then_else to style (Now warn-by-default) #11809

Enhancements

missing_safety_doc, unnecessary_safety_doc, missing_panics_doc, missing_errors_doc: Added the check-private-items configuration to enable lints on private items #11842

ICE Fixes

impl_trait_in_params: No longer crashes when a function has generics but no function parameters #11804
unused_enumerate_index: No longer crashes on empty tuples #11756

Others

Clippy now respects the CARGO environment value #11944

Rust 1.75

Released 2023-12-28

View all 69 merged pull requests

New Lints

Moves and Deprecations

Moved read_zero_byte_vec to nursery (Now allow-by-default) #11727
Moved missing_enforced_import_renames to style (Now warn-by-default) #11539
Moved needless_raw_string_hashes to pedantic (Now allow-by-default) #11415
Moved needless_pass_by_ref_mut to nursery (Now allow-by-default) #11596

Enhancements

declare_interior_mutable_const and borrow_interior_mutable_const: Now check the ignore-interior-mutability config value #11678

Suggestion Fixes/Improvements

items_after_test_module: The suggestion is now machine-applicable #11611

ICE Fixes

redundant_locals: No longer crashes if variables are rebound above macros #11623
implicit_hasher: No longer lints inside macros, which could cause ICEs #11593

Documentation Improvements

cargo clippy --help now uses colors for readability 🎉

Rust 1.74

Released 2023-11-16

View all 94 merged pull requests

New Lints

Moves and Deprecations

Renamed incorrect_clone_impl_on_copy_type to non_canonical_clone_impl #11358
Renamed incorrect_partial_ord_impl_on_ord_type to non_canonical_partial_ord_impl #11358
Moved non_canonical_clone_impl to suspicious (Now warn-by-default) #11358
Moved non_canonical_partial_ord_impl to suspicious (Now warn-by-default) #11358
Moved needless_pass_by_ref_mut to nursery (Now allow-by-default) #11596

Enhancements

undocumented_unsafe_blocks: The config values accept-comment-above-statement and accept-comment-above-attributes are now true by default #11170
explicit_iter_loop: Added enforce-iter-loop-reborrow to disable reborrow linting by default #11418

ICE Fixes

enum_variant_names: No longer crashes if the threshold is 0 and the enum has no variants #11552
cast_possible_truncation: No longer crashes on values larger than u64::MAX #11517
tuple_array_conversions: No longer crashes if the array length is not usize #11379
useless_conversion: No longer crashes, when the receiver is a non-fn item #11070

Rust 1.73

Released 2023-10-05

View all 103 merged pull requests

New Lints

Moves and Deprecations

Renamed unwrap_or_else_default to unwrap_or_default #10120
Moved tuple_array_conversions to pedantic (Now allow-by-default) #11146
Moved arc_with_non_send_sync to suspicious (Now warn-by-default) #11104
Moved needless_raw_string_hashes to pedantic (Now allow-by-default) #11415

Enhancements

unwrap_used: No longer lints on the never-type or never-like enums #11252
expect_used: No longer lints on the never-type or never-like enums #11252

False Positive Fixes

panic_in_result_fn: No longer triggers on todo!, unimplemented!, unreachable! #11123

Suggestion Fixes/Improvements

semicolon_if_nothing_returned: The suggestion is now machine-applicable with rustfix #11083

ICE Fixes

filter_map_bool_then: No longer crashes on late-bound regions #11318
unwrap_or_default: No longer crashes on alias types for local items #11258
unnecessary_literal_unwrap: No longer crashes on None.unwrap_or_default() #11106
Fixed MIR-related ICE #11130
missing_fields_in_debug: No longer crashes on non-ADT self types #11069

Rust 1.72

Released 2023-08-24

View all 131 merged pull requests

New Lints

Moves and Deprecations

Moved redundant_clone to nursery (Now allow-by-default) #10873

Enhancements

undocumented_unsafe_blocks: Added accept-comment-above-attributes configuration #10986
undocumented_unsafe_blocks: Added accept-comment-above-statement configuration. #10886
missing_panics_doc: No longer lints on todo!() #10976
module_inception: Added allow-private-module-inception configuration. #10917
Errors and warnings generated while parsing clippy.toml now point to the location in the TOML file the error/warning occurred in. #10607

False Positive Fixes

excessive_precision: No longer lints overflowing literals #10952

Suggestion Fixes/Improvements

option_map_unwrap_or: The suggestion now considers the set msrv config value #11030

Documentation Improvements

Clippy's lint list now stores filter parameters in the URL, to allow easy sharing #10834

Rust 1.71

Released 2023-07-13

Note: Clippy will use a shorter changelog format from now on, if you want a detailed list of all changes, please check out the list of merged pull requests.

View all 78 merged pull requests

New Lints

Moves and Deprecations

Rename integer_arithmetic to arithmetic_side_effects #10674
Moved redundant_clone to nursery (Now allow-by-default) #10873

Enhancements

invalid_regex: Now supports the new syntax introduced after regex v1.8.0 #10682
semicolon_outside_block: Added semicolon-outside-block-ignore-multiline as a new config value. #10656
semicolon_inside_block: Added semicolon-inside-block-ignore-singleline as a new config value. #10656
unnecessary_box_returns: Added unnecessary-box-size as a new config value to set the maximum size of T in Box<T> to be linted. #10651

Documentation Improvements

cargo clippy --explain LINT now shows possible configuration options for the explained lint #10751
New config values mentioned in this changelog will now be linked. #10889
Several sections of Clippy's book have been reworked #10652 #10622

Rust 1.70

Released 2023-06-01

View all 91 merged pull requests

New Lints

Moves and Deprecations

Moved let_underscore_untyped to restriction #10442

Enhancements

extra_unused_type_parameters: No longer lints on public items if avoid-breaking-exported-api is set #10536
len_without_is_empty: Now also detects async functions #10359
arithmetic_side_effects: Now correctly handles divisions and modulo expressions if the right-hand-side is unknown #10585
nonminimal_bool: No longer ignores #[allow] attributes #10588
uninit_vec, uninit_assumed_init: Now uses a better heuristic #10520
ifs_same_cond: Now also detects immutable method calls. #10350
arithmetic_side_effects: No longer lints on right or left shifts with constant integers, as the compiler warns about them #10309
items_after_statements: #[allow(items_after_statements)] now works on items #10542
significant_drop_tightening: Was optimized #10533

False Positive Fixes

single_component_path_imports: No longer lints if the import is used relative to self #10566
derivable_impls: No longer suggests deriving Default on generics with implicit arguments #10399
let_unit_value: No longer lints if the expression contains an await #10439
double_must_use: Now ignores async functions #10589
manual_clamp: No longer lints in constant context #10479
almost_swapped: Now ignores external macros #10502
nonminimal_bool: Now ignores macros #10527
needless_return: No longer lints match statements with incompatible branches #10593
use_self: Do not suggest using Self in const generic parameters #10375
mem_replace_option_with_none: No longer lints on field expressions #10594
items_after_statements: No longer lints on items from macros #10542
print_literal, write_literal: No longer lint strings coming from the file!() macro #10573
uninit_vec, uninit_assumed_init: Now check the types inside arrays and tuples #10553
almost_swapped: No longer lints if a variable is assigned to itself #10499
missing_docs_in_private_items: No longer lints on public items #10324

Suggestion Fixes/Improvements

extra_unused_type_parameters: The suggestion is now machine applicable #10536
match_single_binding: Now adds a semicolon after the suggestion #10470
missing_const_for_fn: Now includes a note if the change could break compatibility #10618
cast_possible_truncation: Corrected suggestion for float and wildcard casts #10496
transmutes_expressible_as_ptr_casts: The suggestion now includes parentheses when they are required #10454

ICE Fixes

needless_borrow: No longer panics on ambiguous projections #10403
multiple_unsafe_ops_per_block: Fix ICE when calling a function-like object in an unsafe block #10405

Others

clippy-driver now searches parent directories for clippy.toml files #10592
Fixed a deserialization error for the array-size-threshold config value #10423

Rust 1.69

Released 2023-04-20

View all 72 merged pull requests

New Lints

Moves and Deprecations

Moved uninlined_format_args to pedantic (Now allow-by-default) #10265
Moved unchecked_duration_subtraction to pedantic (Now allow-by-default) #10194

Enhancements

arithmetic_side_effects: No longer lints if safe constant values are used. #10310
needless_lifetimes: Now works in local macros #10257
unused_io_amount: Now detects usages of is_ok and is_err #10225
missing_docs_in_private_items: Added new configuration missing-docs-in-crate-items to lint on items visible within the current crate. For example, pub(crate) items. #10303
almost_swapped: Now detects almost swaps using let statements #10177
wildcard_enum_match_arm: Now lints missing private variants, for local enums #10250

False Positive Fixes

explicit_auto_deref: Now considers projections when determining if auto deref is applicable #10386
manual_let_else: Now considers side effects of branches before linting #10336
uninlined_format_args: No longer lints for arguments with generic parameters #10343
needless_lifetimes: No longer lints signatures in macros if the lifetime is a metavariable #10380
len_without_is_empty: No longer lints if len as a non-default signature #10255
unusual_byte_groupings: Relaxed the required restrictions for specific sizes to reduce false positives #10353
manual_let_else: No longer lints if-else blocks if they can divergent #10332
expect_used, unwrap_used, dbg_macro, print_stdout, print_stderr: No longer lint in test functions if allow-expect-in-tests is set #10391
unnecessary_safety_comment: No longer lints code inside macros #10106
never_loop: No longer lints statements following break statements for outer blocks. #10311

Suggestion Fixes/Improvements

box_default: The suggestion now includes the type for trait objects when needed #10382
cast_possible_truncation: Now suggests using try_from or allowing the lint #10038
invalid_regex: Regex errors for non-literals or regular strings containing escape sequences will now show the complete error #10231
transmutes_expressible_as_ptr_casts: The suggestion now works if the base type is borrowed #10193
needless_return: Now removes all semicolons on the same line #10187
suspicious_to_owned: The suggestion now shows all options clearly #10295
bytes_nth: Now suggests the correct replacement based on the context #10361
bool_assert_comparison: The suggestion is now machine applicable #10218
cast_possible_truncation: Corrected the lint name in the help message #10330
needless_return: The suggestion now works on if sequences #10345
needless_lifetimes: The suggestion is now machine applicable #10222
map_entry: The suggestion no longer expands macros #10346

ICE Fixes

needless_pass_by_value: Fixed an ICE caused by how late bounds were handled #10328
needless_borrow: No longer panics on ambiguous projections #10403

Documentation Improvements

All configurations are now documented in the Clippy Book #10199

Rust 1.68

Released 2023-03-09

View all 76 merged pull requests

New Lints

Moves and Deprecations

Moved manual_clamp to nursery (Now allow-by-default) #10101
Moved mutex_atomic to restriction #10115
Renamed derive_hash_xor_eq to derived_hash_with_manual_eq #10184

Enhancements

collapsible_str_replace: Now takes MSRV into consideration. The minimal version is 1.58 #10047
unused_self: No longer lints, if the method body contains a todo!() call #10166
derivable_impls: Now suggests deriving Default for enums with default unit variants #10161
arithmetic_side_effects: Added two new config values arithmetic-side-effects-allowed-binary and arithmetic-side-effects-allowed-unary to allow operation on user types #9840
large_const_arrays, large_stack_arrays: avoid integer overflow when calculating total array size #10103
indexing_slicing: add new config suppress-restriction-lint-in-const to enable restriction lints, even if the suggestion might not be applicable #9920
needless_borrow, redundant_clone: Now track references better and detect more cases #9701
derived_hash_with_manual_eq: Now allows #[derive(PartialEq)] with custom Hash implementations #10184
manual_is_ascii_check: Now detects ranges with .contains() calls #10053
transmuting_null: Now detects const pointers to all types #10099
needless_return: Now detects more cases for returns of owned values #10110

False Positive Fixes

field_reassign_with_default: No longer lints cases, where values are initializes from closures capturing struct values #10143
seek_to_start_instead_of_rewind: No longer lints, if the return of seek is used. #10096
manual_filter: Now ignores if expressions where the else branch has side effects or doesn't return None #10091
implicit_clone: No longer lints if the type doesn't implement clone #10022
match_wildcard_for_single_variants: No longer lints on wildcards with a guard #10056
drop_ref: No longer lints idiomatic expression in match arms #10142
arithmetic_side_effects: No longer lints on corner cases with negative number literals #9867
string_lit_as_bytes: No longer lints in scrutinies of match statements #10012
manual_assert: No longer lints in else if statements #10013
needless_return: don't lint when using do yeet #10109
All lints: No longer lint in enum discriminant values when the suggestion won't work in a const context #10008
single_element_loop: No longer lints, if the loop contains a break or continue #10162
uninlined_format_args: No longer suggests inlining arguments in assert! and debug_assert! macros before 2021 edition #10055
explicit_counter_loop: No longer ignores counter changes after continue expressions #10094
from_over_into: No longer lints on opaque types #9982
expl_impl_clone_on_copy: No longer lints on #[repr(packed)] structs with generic parameters #10189

Suggestion Fixes/Improvements

zero_ptr: Now suggests core:: paths for no_std crates #10023
useless_conversion: Now suggests removing calls to into_iter() on an expression implementing Iterator #10020
box_default: The suggestion now uses short paths #10153
default_trait_access, clone_on_copy: The suggestion now uses short paths #10160
comparison_to_empty: The suggestion now removes unused deref operations #9962
manual_let_else: Suggestions for or-patterns now include required brackets. #9966
match_single_binding: suggestion no longer introduces unneeded semicolons #10060
case_sensitive_file_extension_comparisons: Now displays a suggestion with Path #10107
empty_structs_with_brackets: The suggestion is no longer machine applicable, to avoid errors when accessing struct fields #10141
identity_op: Removes borrows in the suggestion when needed #10004
suboptimal_flops: The suggestion now includes parentheses when required #10113
iter_kv_map: Now handles mut and reference annotations in the suggestion #10159
redundant_static_lifetimes: The suggestion no longer removes mut from references #10006

ICE Fixes

new_ret_no_self: Now avoids a stack overflow for impl Trait types #10086
unnecessary_to_owned: Now handles compiler generated notes better #10027

Others

SYSROOT and --sysroot can now be set at the same time #10149
Fix error when providing an array-size-threshold in clippy.toml #10423

Rust 1.67

Released 2023-01-26

View all 104 merged pull requests

New Lints

Moves and Deprecations

Moved needless_collect to nursery (Now allow-by-default) #9705
Moved or_fun_call to nursery (Now allow-by-default) #9829
Uplifted let_underscore_lock into rustc #9697
Uplifted let_underscore_drop into rustc #9697
Moved bool_to_int_with_if to pedantic (Now allow-by-default) #9830
Move index_refutable_slice to pedantic (Now warn-by-default) #9975
Moved manual_clamp to nursery (Now allow-by-default) #10101

Enhancements

The scope of #![clippy::msrv] is now tracked correctly #9924
#[clippy::msrv] can now be used as an outer attribute #9860
Clippy will now avoid Cargo's cache, if Cargo.toml or clippy.toml have changed #9707
uninlined_format_args: Added a new config allow-mixed-uninlined-format-args to allow the lint, if only some arguments can be inlined #9865
needless_lifetimes: Now provides suggests for individual lifetimes #9743
needless_collect: Now detects needless is_empty and contains calls #8744
blanket_clippy_restriction_lints: Now lints, if clippy::restriction is enabled via the command line arguments #9755
mutable_key_type: Now has the ignore-interior-mutability configuration, to add types which should be ignored by the lint #9692
uninlined_format_args: Now works for multiline format! expressions #9945
cognitive_complexity: Now works for async functions #9828 #9836
vec_box: Now avoids an off-by-one error when using the vec-box-size-threshold configuration #9848
never_loop: Now correctly handles breaks in nested labeled blocks #9858 #9837
disallowed_methods, disallowed_types, disallowed_macros: Now correctly resolve paths, if a crate is used multiple times with different versions #9800
disallowed_methods: Can now be used for local methods #9800
print_stdout, print_stderr: Can now be enabled in test with the allow-print-in-tests config value #9797
from_raw_with_void_ptr: Now works for Rc, Arc, alloc::rc::Weak and alloc::sync::Weak types. #9700
needless_borrowed_reference: Now works for struct and tuple patterns with wildcards #9855
or_fun_call: Now supports map_or methods #9689
unwrap_used, expect_used: No longer lints in test code #9686
fn_params_excessive_bools: Is now emitted with the lint level at the linted function #9698

False Positive Fixes

new_ret_no_self: No longer lints when impl Trait<Self> is returned #9733
unnecessary_lazy_evaluations: No longer lints, if the type has a significant drop #9750
option_if_let_else: No longer lints, if any arm has guard #9747
explicit_auto_deref: No longer lints, if the target type is a projection with generic arguments #9813
unnecessary_to_owned: No longer lints, if the suggestion effects types #9796
needless_borrow: No longer lints, if the suggestion is affected by Deref #9674
unused_unit: No longer lints, if lifetimes are bound to the return type #9849
mut_mut: No longer lints cases with unsized mutable references #9835
bool_to_int_with_if: No longer lints in const context #9738
use_self: No longer lints in macros #9704
unnecessary_operation: No longer lints, if multiple macros are involved #9981
allow_attributes_without_reason: No longer lints inside external macros #9630
question_mark: No longer lints for if let Err() with an else branch #9722
unnecessary_cast: No longer lints if the identifier and cast originate from different macros #9980
arithmetic_side_effects: Now detects operations with associated constants #9592
explicit_auto_deref: No longer lints, if the initial value is not a reference or reference receiver #9997
module_name_repetitions, single_component_path_imports: Now handle #[allow] attributes correctly #9879
bool_to_int_with_if: No longer lints if let statements #9714
needless_borrow: No longer lints, if-else-statements that require the borrow #9791
needless_borrow: No longer lints borrows, if moves were illegal #9711
manual_swap: No longer lints in const context #9871

Suggestion Fixes/Improvements

missing_safety_doc, missing_errors_doc, missing_panics_doc: No longer show the entire item in the lint emission. #9772
needless_lifetimes: Only suggests '_ when it's applicable #9743
use_self: Now suggests full paths correctly #9726
redundant_closure_call: Now correctly deals with macros during suggestion creation #9987
unnecessary_cast: Suggestions now correctly deal with references #9996
unnecessary_join: Suggestions now correctly use turbofish operators #9779
equatable_if_let: Can now suggest matches! replacements #9368
string_extend_chars: Suggestions now correctly work for str slices #9741
redundant_closure_for_method_calls: Suggestions now include angle brackets and generic arguments if needed #9745
manual_let_else: Suggestions no longer expand macro calls #9943
infallible_destructuring_match: Suggestions now preserve references #9850
result_large_err: The error now shows the largest enum variant #9662
needless_return: Suggestions are now formatted better #9967
unused_rounding: The suggestion now preserves the original float literal notation #9870

ICE Fixes

result_large_err: Fixed ICE for empty enums #10007
redundant_allocation: Fixed ICE for types with bounded variables #9773
unused_rounding: Fixed ICE, if _ was used as a separator #10001

Rust 1.66

Released 2022-12-15

View all 116 merged pull requests

New Lints

Moves and Deprecations

positional_named_format_parameters was uplifted to rustc under the new name named_arguments_used_positionally #8518
Moved implicit_saturating_sub to style (Now warn-by-default) #9584
Moved derive_partial_eq_without_eq to nursery (now allow-by-default) #9536

Enhancements

nonstandard_macro_braces: Now includes matches!() in the default lint config #9471
suboptimal_flops: Now supports multiplication and subtraction operations #9581
arithmetic_side_effects: Now detects cases with literals behind references #9587
upper_case_acronyms: Now also checks enum names #9580
needless_borrowed_reference: Now lints nested patterns #9573
unnecessary_cast: Now works for non-trivial non-literal expressions #9576
arithmetic_side_effects: Now detects operations with custom types #9559
disallowed_methods, disallowed_types: Not correctly lints types, functions and macros with the same path #9495
self_named_module_files, mod_module_files: Now take remapped path prefixes into account #9475
bool_to_int_with_if: Now detects the inverse if case #9476

False Positive Fixes

arithmetic_side_effects: Now allows operations that can't overflow #9474
unnecessary_lazy_evaluations: No longer lints in external macros #9486
needless_borrow, explicit_auto_deref: No longer lint on unions that require the reference #9490
almost_complete_letter_range: No longer lints in external macros #9467
drop_copy: No longer lints on idiomatic cases in match arms #9491
question_mark: No longer lints in const context #9487
collapsible_if: Suggestion now work in macros #9410
std_instead_of_core: No longer triggers on unstable modules #9545
unused_peekable: No longer lints, if the peak is done in a closure or function #9465
useless_attribute: No longer lints on #[allow] attributes for unsafe_removed_from_name #9593
unnecessary_lazy_evaluations: No longer suggest switching to early evaluation when type has custom Drop implementation #9551
unnecessary_cast: No longer lints on negative hexadecimal literals when cast as floats #9609
use_self: No longer lints in proc macros #9454
never_loop: Now takes let ... else statements into consideration. #9496
default_numeric_fallback: Now ignores constants #9636
uninit_vec: No longer lints Vec::set_len(0) #9519
arithmetic_side_effects: Now ignores references to integer types #9507
large_stack_arrays: No longer lints inside static items #9466
ref_option_ref: No longer lints if the inner reference is mutable #9684
ptr_arg: No longer lints if the argument is used as an incomplete trait object #9645
should_implement_trait: Now also works for default methods #9546

Suggestion Fixes/Improvements

derivable_impls: The suggestion is now machine applicable #9429
match_single_binding: The suggestion now handles scrutinies with side effects better #9601
zero_prefixed_literal: Only suggests using octal numbers, if this is possible #9652
rc_buffer: The suggestion is no longer machine applicable to avoid semantic changes #9633
print_literal, write_literal, uninlined_format_args: The suggestion now ignores comments after the macro call. #9586
expect_fun_call:Improved the suggestion for format! calls with captured variables #9586
nonstandard_macro_braces: The suggestion is now machine applicable and will no longer replace brackets inside the macro argument. #9499
from_over_into: The suggestion is now a machine applicable and contains explanations #9649
needless_return: The automatic suggestion now removes all required semicolons #9497
to_string_in_format_args: The suggestion now keeps parenthesis around values #9590
manual_assert: The suggestion now preserves comments #9479
redundant_allocation: The suggestion applicability is now marked MaybeIncorrect to avoid semantic changes #9634
assertions_on_result_states: The suggestion has been corrected, for cases where the assert! is not in a statement. #9453
nonminimal_bool: The suggestion no longer expands macros #9457
collapsible_match: Now specifies field names, when a struct is destructed #9685
unnecessary_cast: The suggestion now adds parenthesis for negative numbers #9577
redundant_closure: The suggestion now works for impl FnMut arguments #9556

ICE Fixes

unnecessary_to_owned: Avoid ICEs in favor of false negatives if information is missing #9505 #10027
manual_range_contains: No longer ICEs on values behind references #9627
needless_pass_by_value: No longer ICEs on unsized dyn Fn arguments #9531
*_interior_mutable_const lints: no longer ICE on const unions containing !Freeze types #9539

Others

Released rustc_tools_util for version information on Crates.io. (Further adjustments will not be published as part of this changelog)

Rust 1.65

Released 2022-11-03

View all 86 merged pull requests

Important Changes

Clippy now has an --explain <LINT> command to show the lint description in the console #8952

New Lints

Moves and Deprecations

Moved significant_drop_in_scrutinee to nursery (now allow-by-default) #9302
Rename logic_bug to overly_complex_bool_expr #9306
Rename arithmetic to arithmetic_side_effects #9443
Moved only_used_in_recursion to complexity (now warn-by-default) #8804
Moved assertions_on_result_states to restriction (now allow-by-default) #9273
Renamed blacklisted_name to disallowed_names #8974

Enhancements

option_if_let_else: Now also checks for match expressions #8696
explicit_auto_deref: Now lints on implicit returns in closures #9126
needless_borrow: Now considers trait implementations #9136
suboptimal_flops, imprecise_flops: Now lint on constant expressions #9404
if_let_mutex: Now detects mutex behind references and warns about deadlocks #9318

False Positive Fixes

unit_arg default_trait_access missing_docs_in_private_items: No longer trigger in code generated from proc-macros #8694
unwrap_used: Now lints uses of unwrap_err #9338
expect_used: Now lints uses of expect_err #9338
transmute_undefined_repr: Now longer lints if the first field is compatible with the other type #9287
unnecessary_to_owned: No longer lints, if type change cased errors in the caller function #9424
match_like_matches_macro: No longer lints, if there are comments inside the match expression #9276
partialeq_to_none: No longer trigger in code generated from macros #9389
arithmetic_side_effects: No longer lints expressions that only use literals #9365
explicit_auto_deref: Now ignores references on block expressions when the type is Sized, on dyn Trait returns and when the suggestion is non-trivial #9126
trait_duplication_in_bounds: Now better tracks bounds to avoid false positives #9167
format_in_format_args: Now suggests cases where the result is formatted again #9349
only_used_in_recursion: No longer lints on function without recursions and takes external functions into account #8804
missing_const_for_fn: No longer lints in proc-macros #9308
non_ascii_literal: Allow non-ascii comments in tests and make sure #[allow] attributes work in tests #9327
question_mark: No longer lint if lets with subpatterns #9348
needless_collect: No longer lints in loops #8992
mut_mutex_lock: No longer lints if the mutex is behind an immutable reference #9418
needless_return: Now ignores returns with arguments #9381
range_plus_one, range_minus_one: Now ignores code with macros #9446
assertions_on_result_states: No longer lints on the unit type #9273

Suggestion Fixes/Improvements

unwrap_or_else_default: Now suggests unwrap_or_default() for empty strings #9421
if_then_some_else_none: Now also suggests bool::then_some #9289
redundant_closure_call: The suggestion now works for async closures #9053
suboptimal_flops: Now suggests parenthesis when they are required #9394
case_sensitive_file_extension_comparisons: Now suggests map_or(..) instead of map(..).unwrap_or #9341
Deprecated configuration values can now be updated automatically #9252
or_fun_call: Now suggest Entry::or_default for Entry::or_insert(Default::default()) #9342
unwrap_used: Only suggests expect if expect_used is allowed #9223

ICE Fixes

Fix ICE in useless_format for literals #9406
Fix infinite loop in vec_init_then_push #9441
Fix ICE when reading literals with weird proc-macro spans #9303

Rust 1.64

Released 2022-09-22

View all 110 merged pull requests

New Lints

Moves and Deprecations

Moved format_push_string to restriction (now allow-by-default) #9161

Enhancements

significant_drop_in_scrutinee: Now gives more context in the lint message #8981
single_match, single_match_else: Now catches more Option cases #8985
unused_async: Now works for async methods #9025
manual_filter_map, manual_find_map: Now lint more expressions #8958
question_mark: Now works for simple if let expressions #8356
undocumented_unsafe_blocks: Now finds comments before the start of closures #9117
trait_duplication_in_bounds: Now catches duplicate bounds in where clauses #8703
shadow_reuse, shadow_same, shadow_unrelated: Now lint in const blocks #9124
slow_vector_initialization: Now detects cases with vec.capacity() #8953
unused_self: Now respects the avoid-breaking-exported-api config option #9199
box_collection: Now supports all std collections #9170

False Positive Fixes

significant_drop_in_scrutinee: Now ignores calls to IntoIterator::into_iter #9140
while_let_loop: Now ignores cases when the significant drop order would change #8981
branches_sharing_code: Now ignores cases where moved variables have a significant drop or variable modifications can affect the conditions #9138
let_underscore_lock: Now ignores bindings that aren't locked #8990
trivially_copy_pass_by_ref: Now tracks lifetimes and ignores cases where unsafe pointers are used #8639
let_unit_value: No longer ignores #[allow] attributes on the value #9082
declare_interior_mutable_const: Now ignores the thread_local! macro #9015
if_same_then_else: Now ignores branches with todo! and unimplemented! #9006
enum_variant_names: Now ignores names with _ prefixes #9032
let_unit_value: Now ignores cases, where the unit type is manually specified #9056
match_same_arms: Now ignores branches with todo! #9207
assign_op_pattern: Ignores cases that break borrowing rules #9214
extra_unused_lifetimes: No longer triggers in derive macros #9037
mismatching_type_param_order: Now ignores complicated generic parameters #9146
equatable_if_let: No longer lints in macros #9074
new_without_default: Now ignores generics and lifetime parameters on fn new #9115
needless_borrow: Now ignores cases that result in the execution of different traits #9096
declare_interior_mutable_const: No longer triggers in thread-local initializers #9246

Suggestion Fixes/Improvements

type_repetition_in_bounds: The suggestion now works with maybe bounds #9132
transmute_ptr_to_ref: Now suggests pointer::cast when possible #8939
useless_format: Now suggests the correct variable name #9237
or_fun_call: The lint emission will now only span over the unwrap_or call #9144
neg_multiply: Now suggests adding parentheses around suggestion if needed #9026
unnecessary_lazy_evaluations: Now suggest for bool::then_some for lazy evaluation #9099
manual_flatten: Improved message for long code snippets #9156
explicit_counter_loop: The suggestion is now machine applicable #9149
needless_borrow: Now keeps parentheses around fields, when needed #9210
while_let_on_iterator: The suggestion now works in FnOnce closures #9134

ICE Fixes

Fix ICEs related to #![feature(generic_const_exprs)] usage #9241
Fix ICEs related to reference lints #9093
question_mark: Fix ICE on zero field tuple structs #9244

Documentation Improvements

needless_option_take: Now includes a "What it does" and "Why is this bad?" section. #9022

Others

Using --cap-lints=allow and only --force-warning some will now work with Clippy's driver #9036
Clippy now tries to read the rust-version from Cargo.toml to identify the minimum supported rust version #8774

Rust 1.63

Released 2022-08-11

View all 91 merged pull requests

New Lints

Moves and Deprecations

Rename eval_order_dependence to mixed_read_write_in_expression, move to nursery #8621

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

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

ICE Fixes

Fix ICE in let_unit_value when calling a static/const callable type #8835
Fix ICEs on callable static/consts #8896
needless_late_init #8912
Fix ICE in shadow lints #8913

Documentation Improvements

Clippy has a Book now! #7359
Add a copy lint name-button to Clippy's lint list #8839
Display past names of renamed lints on Clippy's lint list #8843
Add the ability to show the lint output in the lint list #8947

Rust 1.62

Released 2022-06-30

View all 90 merged pull requests

New Lints

Moves and Deprecations

Move only_used_in_recursion to nursery (now allow-by-default) #8783
Move stable_sort_primitive to pedantic (now allow-by-default) #8716

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

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

ICE Fixes

Rust 1.61

Released 2022-05-19

View all 60 merged pull requests

New Lints

Moves and Deprecations

Moved transmute_undefined_repr to nursery (now allow-by-default) #8432
Moved try_err to restriction #8544
Move iter_with_drain to nursery #8541
Renamed to_string_in_display to recursive_format_impl #8188

Enhancements

dbg_macro: The lint level can now be set with crate attributes and works inside macros #8411
ptr_as_ptr: Now works inside macros #8442
use_self: Now works for variants in match expressions #8456
await_holding_lock: Now lints for parking_lot::{Mutex, RwLock} #8419
recursive_format_impl: Now checks for format calls on self #8188

False Positive Fixes

new_without_default: No longer lints for new() methods with #[doc(hidden)] #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 #8553 #8440 #8547
match_single_binding, match_same_arms, match_as_ref, match_bool: No longer lint match expressions with cfged arms #8443
single_component_path_imports: No longer lint on macros #8537
ptr_arg: Allow &mut arguments for Cow<_> #8552
needless_borrow: No longer lints for method calls #8441
match_same_arms: Now ensures that interposing arm patterns don't overlap #8232
default_trait_access: Now allows Default::default in update expressions #8433

Suggestion Fixes/Improvements

redundant_slicing: Fixed suggestion for a method calls #8218
map_flatten: Long suggestions will now be split up into two help messages #8520
unnecessary_lazy_evaluations: Now shows suggestions for longer code snippets #8543
unnecessary_sort_by: Now suggests Reverse including the path #8462
search_is_some: More suggestions are now MachineApplicable #8536

Documentation Improvements

new_without_default: Document pub requirement for the struct and fields #8429

Rust 1.60

Released 2022-04-07

View all 73 merged pull requests

New Lints

Moves and Deprecations

Moved disallowed_methods and disallowed_types to style (now warn-by-default) #8261
Rename ref_in_deref to needless_borrow #8217
Moved mutex_atomic to nursery (now allow-by-default) #8260

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

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

ICE Fixes

manual_split_once #8250

Documentation Improvements

map_flatten: Add documentation for the Option type #8354
Document that Clippy's driver might use a different code generation than rustc #8037
Clippy's lint list will now automatically focus the search box #8343

Others

Clippy now warns if we find multiple Clippy config files exist #8326

Rust 1.59

Released 2022-02-24

View all 94 merged pull requests

New Lints

Moves and Deprecations

Move if_then_panic to pedantic and rename to manual_assert (now allow-by-default) #7810
Rename disallow_type to disallowed_types and disallowed_method to disallowed_methods #7984
Move map_flatten to complexity (now warn-by-default) #8054

Enhancements

match_overlapping_arm: Fix false negative where after included ranges, overlapping ranges weren't linted anymore #7909
deprecated_cfg_attr: Now takes the specified MSRV into account #7944
cast_lossless: Now also lints for bool to integer casts #7948
let_underscore_lock: Also emit lints for the parking_lot crate #7957
needless_borrow #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
- Lint when used without a fully-qualified path
- Suggest removing the surrounding unsafe block when possible
non_ascii_literal: Now also lints on chars, not just strings #8034
single_char_pattern: Now also lints on split_inclusive, split_once, rsplit_once, replace, and replacen #8077
unwrap_or_else_default: Now also lints on std constructors like Vec::new, HashSet::new, and HashMap::new #8163
shadow_reuse: Now also lints on shadowed if let bindings, instead of shadow_unrelated #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
manual_split_once: No longer suggests code changing the original behavior #7896
Don't show no_effect or unnecessary_operation warning for unit struct implementing FnOnce #7898
semicolon_if_nothing_returned: Fixed a bug, where the lint wrongly triggered on let-else statements #7955
if_then_some_else_none: No longer lints if there is an early return #7980
needless_collect: No longer suggests removal of collect when removal would create code requiring mutably borrowing a value multiple times #7982
shadow_same: Fix false positive for async function's params #7997
suboptimal_flops: No longer triggers in constant functions #8009
type_complexity: No longer lints on associated types in traits #8030
question_mark: No longer lints if returned object is not local #8080
option_if_let_else: No longer lint on complex sub-patterns #8086
blocks_in_if_conditions: No longer lints on empty closures #8100
enum_variant_names: No longer lint when first prefix is only a substring of a camel-case word #8127
identity_op: Only lint on integral operands #8183

Suggestion Fixes/Improvements

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

ICE Fixes

Documentation Improvements

print_stdout, print_stderr, dbg_macro: Document how the lint level can be changed crate-wide #8040
Added a note to the README that config changes don't apply to already compiled code #8175

Others

Clippy's lint list now displays the version a lint was added. 🎉 #7813
New and improved issue templates #8032
Dev: Add cargo dev lint command, to run your modified Clippy version on a file #7917

Rust 1.58

Released 2022-01-13

View all 68 merged pull requests

Rust 1.58.1

Move non_send_fields_in_send_ty to nursery (now allow-by-default) #8075
useless_format: Handle implicit named arguments #8295

New lints

Moves or deprecations of lints

Move non_send_fields_in_send_ty to suspicious #7874
Move non_ascii_literal to restriction #7907

Changes that expand what code existing lints cover

question_mark now covers Result #7840
Make useless_format recognize bare format!("") #7801
Lint on underscored variables with no side effects in no_effect #7775
Expand match_ref_pats to check for multiple reference patterns #7800

False positive fixes

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

Suggestion fixes/improvements

Keep an initial :: when doc_markdown suggests to use ticks #7916
Add a machine applicable suggestion for the doc_markdown missing backticks lint #7904
equatable_if_let no longer expands macros in the suggestion #7788
Make shadow_reuse suggestion less verbose #7782

ICE fixes

Fix ICE in enum_variant_names #7873
Fix ICE in undocumented_unsafe_blocks #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
Fix typo in example for match_result_ok #7815

Others

Allow giving reasons for disallowed_types #7791
Fix manual_assert and match_wild_err_arm for #![no_std] and Rust 2021. #7851
Fix regression in semicolon_if_nothing_returned on macros containing while loops #7789
Added a new configuration literal-suffix-style to enforce a certain style writing unseparated_literal_suffix #7726

Rust 1.57

Released 2021-12-02

View all 148 merged pull requests

New Lints

Moves and Deprecations

Move shadow_unrelated to restriction #7338
Move option_if_let_else to nursery #7568
Move branches_sharing_code to nursery #7595
Rename if_let_some_result to match_result_ok which now also handles while let cases #7608
Move many_single_char_names to pedantic #7671
Move float_cmp to pedantic #7692
Rename box_vec to box_collection and lint on more general cases #7693
Uplift invalid_atomic_ordering to rustc rust-lang/rust#84039

Enhancements

Rewrite the shadow* lints, so that they find a lot more shadows and are not limited to certain patterns #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
unnecessary_unwrap: Now also checks for expects #7584
disallowed_methods: Allow adding a reason that will be displayed with the lint message #7621
approx_constant: Now checks the MSRV for LOG10_2 and LOG2_10 #7629
approx_constant: Add TAU #7642
needless_borrow: Now also lints on needless mutable borrows #7657
missing_safety_doc: Now also lints on unsafe traits #7734

False Positive Fixes

manual_map: No longer lints when the option is borrowed in the match and also consumed in the arm #7531
filter_next: No longer lints if filter method is not the Iterator::filter method #7562
manual_flatten: No longer lints if expression is used after if let #7566
option_if_let_else: Multiple fixes #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
bool_assert_comparison: No longer lints on types that do not implement the Not trait with Output = bool #7605
mut_range_bound: No longer lints on range bound mutations, that are immediately followed by a break; #7607
mutable_key_type: Improve accuracy and document remaining false positives and false negatives #7640
redundant_closure: Rewrite the lint to fix various false positives and false negatives #7661
large_enum_variant: No longer wrongly identifies the second largest variant #7677
needless_return: No longer lints on let-else expressions #7685
suspicious_else_formatting: No longer lints in proc-macros #7707
excessive_precision: No longer lints when in some cases the float was already written in the shortest form #7722
doc_markdown: No longer lints on intra-doc links #7772

Suggestion Fixes/Improvements

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

ICE Fixes

implicit_hasher #7761

Others

Clippy now uses the 2021 Edition! #7664

Rust 1.56

Released 2021-10-21

View all 38 merged pull requests

New Lints

unwrap_or_else_default #7516

Enhancements

needless_continue: Now also lints in loop { continue; } case #7477
disallowed_types: Now also primitive types can be disallowed #7488
manual_swap: Now also lints on xor swaps #7506
map_flatten: Now also lints on the Result type #7522
no_effect: Now also lints on inclusive ranges #7556

False Positive Fixes

nonstandard_macro_braces: No longer lints on similar named nested macros #7478
too_many_lines: No longer lints in closures to avoid duplicated diagnostics #7534
similar_names: No longer complains about iter and item being too similar #7546

Suggestion Fixes/Improvements

similar_names: No longer suggests to insert or add an underscore as a fix #7221
new_without_default: No longer shows the full qualified type path when suggesting adding a Default implementation #7493
while_let_on_iterator: Now suggests re-borrowing mutable references #7520
extend_with_drain: Improve code suggestion for mutable and immutable references #7533
trivially_copy_pass_by_ref: Now properly handles Self type #7535
never_loop: Now suggests using if let instead of a for loop when applicable #7541

Documentation Improvements

Clippy now uses a lint to generate its lint documentation. Lints all the way down. #7502
Reworked Clippy's website: #7172 #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
unnested_or_patterns: Removed or_patterns feature gate in the code example #7507

Rust 1.55

Released 2021-09-09

View all 83 merged pull requests

Important Changes

Stabilized cargo clippy --fix 🎉 #7405

New Lints

Moves and Deprecations

Moved from_iter_instead_of_collect to pedantic #7375
Added suspicious as a new lint group for code that is most likely wrong or useless #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
doc_markdown:
- Now detects unbalanced ticks #7357
- Add FreeBSD to the default configuration as an allowed identifier #7334
wildcard_enum_match_arm, match_wildcard_for_single_variants: Now allows wildcards for enums with unstable or hidden variants #7407
redundant_allocation: Now additionally supports the Arc<> type #7308
disallowed_names: Now allows disallowed names in test code #7379
redundant_closure: Suggests &mut for FnMut #7437
disallowed_methods, disallowed_types: The configuration values disallowed-method and disallowed-type no longer require fully qualified paths #7345
zst_offset: Fixed lint invocation after it was accidentally suppressed #7396

False Positive Fixes

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

Suggestion Fixes/Improvements

needless_collect: Now show correct lint messages for shadowed values #7289
wrong_pub_self_convention: The deprecated message now suggest the correct configuration value #7382
semicolon_if_nothing_returned: Allow missing semicolon in blocks with only one expression #7326

ICE Fixes

Rust 1.54

Released 2021-07-29

View all 74 merged pull requests

New Lints

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) #7187
Move inconsistent_struct_constructor to pedantic #7193
Move needless_borrow to style (now warn-by-default) #7254
Move suspicious_operation_groupings to nursery #7266
Move semicolon_if_nothing_returned to pedantic #7268

Enhancements

while_let_on_iterator: Now also lints in nested loops #6966
single_char_pattern: Now also lints on strip_prefix and strip_suffix #7156
needless_collect: Now also lints on assignments with type annotations #7163
if_then_some_else_none: Now works with the MSRV config #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
needless_collect: Now lints on even more data structures #7188
missing_docs_in_private_items: No longer sees #[<name> = "<value>"] like attributes as sufficient documentation #7281
needless_collect, short_circuit_statement, unnecessary_operation: Now work as expected when used with allow #7282

False Positive Fixes

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

Suggestion Fixes/Improvements

implicit_return #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
match_single_binding: Improve suggestion when match scrutinee has side effects #7095
needless_borrow: Now suggests to also change usage sites as needed #7105
write_with_newline: Improve suggestion when only \n is written to the buffer #7183
from_iter_instead_of_collect: The suggestion is now auto applicable also when a <_ as Trait>::_ is involved #7264
not_unsafe_ptr_arg_deref: Improved error message #7294

ICE Fixes

Fix ICE when running Clippy on libstd #7140
implicit_return #7242

Rust 1.53

Released 2021-06-17

View all 126 merged pull requests

New Lints

Moves and Deprecations

Deprecate filter_map lint #7059
Move transmute_ptr_to_ptr to pedantic #7102

Enhancements

mem_replace_with_default: Also lint on common std constructors #6820
wrong_self_convention: Also lint on to_*_mut methods #6828
wildcard_enum_match_arm, match_wildcard_for_single_variants: #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
or_fun_call: Also lint on unsafe blocks #6928
vec_box, linkedlist, option_option: Also lint in const and static items #6938
search_is_some: Also check for is_none #6942
string_lit_as_bytes: Also lint on into_bytes #6959
len_without_is_empty: Also lint if function signatures of len and is_empty don't match #6980
redundant_pattern_matching: Also lint if the pattern is a & pattern #6991
clone_on_copy: Also lint on chained method calls taking self by value #7000
missing_panics_doc: Also lint on assert_eq! and assert_ne! #7029
needless_return: Also lint in async functions #7067
unused_io_amount: Also lint on expressions like _.read().ok()? #7100
iter_cloned_collect: Also lint on large arrays, since const-generics are now stable #7138

False Positive Fixes

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

Suggestion Fixes/Improvements

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

ICE Fixes

Others

Clippy's lint list now supports themes #7030
Lints that were uplifted to rustc now mention the new rustc name in the deprecation warning #7056

Rust 1.52

Released 2021-05-06

View all 102 merged pull requests

New Lints

Moves and Deprecations

Moved upper_case_acronyms to pedantic #6775
Moved manual_map to nursery #6796
Moved unnecessary_wraps to pedantic #6765
Moved trivial_regex to nursery #6696
Moved naive_bytecount to pedantic #6825
Moved upper_case_acronyms to style #6788
Moved manual_map to style #6801

Enhancements

disallowed_methods: Now supports functions in addition to methods #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
collapsible_match: Now supports block comparison with different value names #6754
unnecessary_wraps: Will now suggest removing unnecessary wrapped return unit type, like Option<()> #6665
Improved value usage detection in closures #6698

False Positive Fixes

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

Suggestion Fixes/Improvements

collapsible_match: Fixed lint message capitalization #6766
or_fun_call: Improved suggestions for or_insert(vec![]) #6790
manual_map: No longer expands macros in the suggestions #6801
Aligned Clippy's lint messages with the rustc dev guide #6787

ICE Fixes

zero_sized_map_values #6866

Documentation Improvements

useless_format: Improved the documentation example #6854
Clippy's README.md: Includes a new subsection on running Clippy as a rustc wrapper #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
Cargo now re-runs Clippy if arguments after -- provided to cargo clippy are changed. #6834
Extracted Clippy's utils module into the new clippy_utils crate #6756
Clippy lintcheck tool improvements #6800 #6735 #6764 #6708 #6780 #6686

Rust 1.51

Released 2021-03-25

View all 78 merged pull requests

New Lints

upper_case_acronyms #6475
from_over_into #6476
case_sensitive_file_extension_comparisons #6500
needless_question_mark #6507
missing_panics_doc #6523
redundant_slicing #6528
vec_init_then_push #6538
ptr_as_ptr #6542
collapsible_else_if (split out from collapsible_if) #6544
inspect_for_each #6577
manual_filter_map #6591
exhaustive_enums #6617
exhaustive_structs #6617

Moves and Deprecations

Replace find_map with manual_find_map #6591
unknown_clippy_lints Now integrated in the unknown_lints rustc lint #6653

Enhancements

ptr_arg Now also suggests to use &Path instead of &PathBuf #6506
cast_ptr_alignment Also lint when the pointer::cast method is used #6557
collapsible_match Now also deals with & and * operators in the match scrutinee #6619

False Positive Fixes

similar_names Ignore underscore prefixed names #6403
print_literal and write_literal No longer lint numeric literals #6408
large_enum_variant No longer lints in external macros #6485
empty_enum Only lint if never_type feature is enabled #6513
field_reassign_with_default No longer lints in macros #6553
size_of_in_element_count No longer lints when dividing by element size #6578
needless_return No longer lints in macros #6586
match_overlapping_arm No longer lint when first arm is completely included in second arm #6603
doc_markdown Add WebGL to the default configuration as an allowed identifier #6605

Suggestion Fixes/Improvements

field_reassign_with_default Don't expand macro in lint suggestion #6531
match_like_matches_macro Strip references in suggestion #6532
single_match Suggest if over if let when possible #6574
ref_in_deref Use parentheses correctly in suggestion #6609
stable_sort_primitive Clarify error message #6611

ICE Fixes

zero_sized_map_values #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
Clean up README.md by removing outdated paragraph #6488
await_holding_refcell_ref and await_holding_lock #6585
as_conversions #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
The Clippy version number now corresponds to the Rust version number #6526
Fix oversight which caused Clippy to lint deps in some environments, where CLIPPY_TESTS=true was set somewhere #6575
Add cargo dev-lintcheck tool to the Clippy Dev Tool #6469

Rust 1.50

Released 2021-02-11

View all 119 merged pull requests

New Lints

Moves and Deprecations

Previously deprecated str_to_string and string_to_string have been un-deprecated as restriction lints #6333
Deprecate panic_params lint. This is now available in rustc as non_fmt_panics #6351
Move map_err_ignore to restriction #6416
Move await_holding_refcell_ref to pedantic #6354
Move await_holding_lock to pedantic #6354

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

vec_box: Provide correct type scope suggestion #6271
manual_range_contains: Give correct suggestion when using floats #6320
unnecessary_lazy_evaluations: Don't always mark suggestion as MachineApplicable #6272
manual_async_fn: Improve suggestion formatting #6294
unnecessary_cast: Fix incorrectly formatted float literal suggestion #6362

ICE Fixes

Fix a crash in from_iter_instead_of_collect #6304
Fix a silent crash when parsing doc comments in needless_doctest_main #6458

Documentation Improvements

The lint website search has been improved (#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
Add known problems to comparison_chain documentation #6390
Fix example used in cargo_common_metadata #6293
Improve map_clone documentation #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 #6201
Add --no-deps option to avoid running on path dependencies in workspaces #6188

Rust 1.49

Released 2020-12-31

View all 107 merged pull requests

New Lints

Moves and Deprecations

Rename single_char_push_str to single_char_add_str #6037
Rename zero_width_space to invisible_characters #6105
Deprecate drop_bounds (uplifted) #6111
Move string_lit_as_bytes to nursery #6117
Move rc_buffer to restriction #6128

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

unnecessary_sort_by: Avoid dereferencing the suggested closure parameter #6078
needless_arbitrary_self_type: Correctly handle expanded code #6093
useless_format: Preserve raw strings in suggestion #6151
empty_loop: Suggest alternatives #6162
borrowed_box: Correctly add parentheses in suggestion #6200
unused_unit: Improve suggestion formatting #6247

Documentation Improvements

Some doc improvements:
- rc_buffer #6090
- empty_loop #6162
doc_markdown: Document problematic link text style #6107

Rust 1.48

Released 2020-11-19

View all 99 merged pull requests

New lints

Moves and Deprecations

Downgrade verbose_bit_mask to pedantic #6036

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

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

ICE Fixes

Fix ICE in repeat_once #5948

Documentation Improvements

mutable_key_type: explain potential for false positives when the interior mutable type is not accessed in the Hash implementation #6019
unnecessary_mut_passed: fix typo #5913
Add example of false positive to ptr_arg docs. #5885
box_vec, vec_box and borrowed_box: add link to the documentation of Box #6023

Rust 1.47

Released 2020-10-08

View all 76 merged pull requests

New lints

Moves and Deprecations

Deprecate regex_macro lint #5760
Move range_minus_one to pedantic #5752

Enhancements

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

False Positive Fixes

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

Suggestion Fixes/Improvements

Improve readability of shadow_unrelated suggestion by truncating the RHS snippet #5788
Suggest filter_map instead of flat_map when mapping to Option in map_flatten #5846
Ensure suggestion is shown correctly for long method call chains in iter_nth_zero #5793
Drop borrow operator in suggestions of redundant_pattern_matching #5815
Add suggestion for iter_skip_next #5843
Improve collapsible_if fix suggestion #5732

ICE Fixes

Fix ICE caused by needless_collect #5877
Fix ICE caused by unnested_or_patterns #5784

Documentation Improvements

Fix grammar of await_holding_lock documentation #5748

Others

Make lints adhere to the rustc dev guide #5888

Rust 1.46

Released 2020-08-27

View all 48 merged pull requests

New lints

Moves and Deprecations

Move cast_ptr_alignment to pedantic #5667

Enhancements

Improve mem_replace_with_uninit lint #5695

False Positive Fixes

len_zero: Avoid linting ranges when the range_is_empty feature is not enabled #5656
let_and_return: Don't lint if a temporary borrow is involved #5680
reversed_empty_ranges: Avoid linting N..N in for loop arguments in #5692
if_same_then_else: Don't assume multiplication is always commutative #5702
disallowed_names: Remove bar from the default configuration #5712
redundant_pattern_matching: Avoid suggesting non-const fn calls in const contexts #5724

Suggestion Fixes/Improvements

Fix suggestion of unit_arg lint, so that it suggest semantic equivalent code #4455
Add auto applicable suggestion to macro_use_imports #5279

ICE Fixes

Fix ICE in the consts module of Clippy #5709

Documentation Improvements

Improve code examples across multiple lints #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
New issue templates now make it easier to complain if Clippy is too annoying or not annoying enough! #5735

Rust 1.45

Released 2020-07-16

View all 81 merged pull requests

New lints

Moves and Deprecations

Downgrade match_bool to pedantic #5408
Downgrade match_wild_err_arm to pedantic and update help messages. #5622
Downgrade useless_let_if_seq to nursery. #5599
Generalize option_and_then_some and rename to bind_instead_of_map. #5529
Rename identity_conversion to useless_conversion. #5568
Merge block_in_if_condition_expr and block_in_if_condition_stmt into blocks_in_if_conditions. #5563
Merge option_map_unwrap_or, option_map_unwrap_or_else and result_map_unwrap_or_else into map_unwrap_or. #5563
Merge option_unwrap_used and result_unwrap_used into unwrap_used. #5563
Merge option_expect_used and result_expect_used into expect_used. #5563
Merge for_loop_over_option and for_loop_over_result into for_loops_over_fallibles. #5563

Enhancements

Avoid running cargo lints when not enabled to improve performance. #5505
Extend useless_conversion with TryFrom and TryInto. #5631
Lint also in type parameters and where clauses in unused_unit. #5592
Do not suggest deriving Default in new_without_default. #5616

False Positive Fixes

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

Suggestion Improvements

Simplify suggestions in manual_memcpy. #5536
Fix suggestion in redundant_pattern_matching for macros. #5511
Avoid suggesting copied() for mutable references in map_clone. #5530
Improve help message for clone_double_ref. #5547

ICE Fixes

Fix ICE caused in unwrap module. #5590
Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs #5499

Documentation

Clarify the documentation of unnecessary_mut_passed. #5639
Extend example for unneeded_field_pattern. #5541

Rust 1.44

Released 2020-06-04

View all 124 merged pull requests

New lints

Moves and Deprecations

Deprecate replace_consts lint #5380
Move cognitive_complexity to nursery #5428
Move useless_transmute to nursery #5364
Downgrade inefficient_to_string to pedantic #5412
Downgrade option_option to pedantic #5401
Downgrade unreadable_literal to pedantic #5419
Downgrade let_unit_value to pedantic #5409
Downgrade trivially_copy_pass_by_ref to pedantic #5410
Downgrade implicit_hasher to pedantic #5411

Enhancements

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

False Positive Fixes

Suggestion Improvements

Improved question_mark lint suggestion so that it doesn't add redundant as_ref() #5481
Improve the suggested placeholder in option_map_unit_fn #5292
Improve suggestion for match_single_binding when triggered inside a closure #5350

ICE Fixes

Handle the unstable trivial_bounds feature #5296
shadow_* lints #5297

Documentation

Fix documentation generation for configurable lints #5353
Update documentation for new_ret_no_self #5448
The documentation for option_option now suggest using a tri-state enum #5403
Fix bit mask example in verbose_bit_mask documentation #5454
wildcard_imports documentation now mentions that use ...::prelude::* is not linted #5312

Rust 1.43

Released 2020-04-23

View all 91 merged pull requests

New lints

Moves and Deprecations

Move unneeded_field_pattern to pedantic group #5200

Enhancements

Make missing_errors_doc lint also trigger on async functions #5181
Add more constants to approx_constant #5193
Extend question_mark lint #5266

False Positive Fixes

Suggestion Improvements

Improve suggestion when blocks of code are suggested #5134

ICE Fixes

misc_early lints #5129
missing_errors_doc #5213
Fix ICE when evaluating usizes #5256

Documentation

Improve documentation of iter_nth_zero
Add documentation pages for stable releases #5171

Others

Clippy now completely runs on GitHub Actions #5190

Rust 1.42

Released 2020-03-12

View all 101 merged pull requests

New lints

Moves and Deprecations

Move transmute_float_to_int from nursery to complexity group #5015
Move range_plus_one to pedantic group #5057
Move debug_assert_with_mut_call to nursery group #5106
Deprecate unused_label #4930

Enhancements

Lint vectored IO in unused_io_amount #5027
Make vec_box configurable by adding a size threshold #5081
Also lint constants in cmp_nan #4910
Fix false negative in expect_fun_call #4915
Fix false negative in redundant_clone #5017

False Positive Fixes

map_clone #4937
replace_consts #4977
let_and_return #5008
eq_op #5079
possible_missing_comma #5083
debug_assert_with_mut_call #5106
Don't trigger let_underscore_must_use in external macros #5082
Don't trigger empty_loop in no_std crates #5086

Suggestion Improvements

ICE fixes

unsound_collection_transmute #4975

Documentation

Improve documentation of empty_enum, replace_consts, redundant_clone, and iterator_step_by_zero

Rust 1.41

Released 2020-01-30

View all 74 merged pull requests

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

Rust 1.40

Released 2019-12-19

View all 76 merged pull requests

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

Rust 1.39

Released 2019-11-07

View all 100 merged pull requests

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

Rust 1.38

Released 2019-09-26

View all 76 merged pull requests

New Lints:
Move {unnecessary,panicking}_unwrap out of nursery #4307
Extend the use_self lint to suggest uses of Self::Variant #4308
Improve suggestion for needless return #4262
Add auto-fixable suggestion for let_unit #4337
Fix false positive in pub_enum_variant_names and enum_variant_names #4345
Fix false positive in cast_ptr_alignment #4257
Fix false positive in string_lit_as_bytes #4233
Fix false positive in needless_lifetimes #4266
Fix false positive in float_cmp #4275
Fix false positives in needless_return #4274
Fix false negative in match_same_arms #4246
Fix incorrect suggestion for needless_bool #4335
Improve suggestion for cast_ptr_alignment #4257
Improve suggestion for single_char_literal #4361
Improve suggestion for len_zero #4314
Fix ICE in implicit_hasher #4268
Fix allow bug in trivially_copy_pass_by_ref #4250

Rust 1.37

Released 2019-08-15

View all 72 merged pull requests

New Lints:
Renamed Lint: const_static_lifetime is now called redundant_static_lifetimes. The lint now covers statics in addition to consts #4162
match_same_arms now warns for all identical arms, instead of only the first one #4102
needless_return now works with void functions #4220
Fix false positive in redundant_closure #4190
Fix false positive in useless_attribute #4107
Fix incorrect suggestion for float_cmp #4214
Add suggestions for print_with_newline and write_with_newline #4136
Improve suggestions for option_map_unwrap_or_else and result_map_unwrap_or_else #4164
Improve suggestions for non_ascii_literal #4119
Improve diagnostics for let_and_return #4137
Improve diagnostics for trivially_copy_pass_by_ref #4071
Add macro check for unreadable_literal #4099

Rust 1.36

Released 2019-07-04

View all 81 merged pull requests

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

Rust 1.35

Released 2019-05-20

1fac380..37f5c1e

New lint: drop_bounds to detect T: Drop bounds
Split redundant_closure into redundant_closure and redundant_closure_for_method_calls #4110
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, #3772, #3741

Rust 1.34

Released 2019-04-10

View all 61 merged pull requests

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 for more details.
We now have improved documentation on how to add new lints

Rust 1.33

Released 2019-02-26

View all 120 merged pull requests

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

View all 71 merged pull requests

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

Clippy has been relicensed under a dual MIT / Apache license. See #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

View all 88 merged pull requests

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 \ns 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

🎉 🎉 Rust 1.29 is the first stable Rust that includes a bundled Clippy 🎉 🎉 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 😄)
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

354 KiB Raw Blame History

Changelog

Unreleased / Beta / In Rust Nightly

Rust 1.82

New Lints

Enhancements

ICE Fixes

Rust 1.81

New Lints

Moves and Deprecations

Enhancements

ICE Fixes

Rust 1.80

New Lints

Moves and Deprecations

Enhancements

Suggestion Fixes/Improvements

Rust 1.79

New Lints

Moves and Deprecations

Enhancements

False Positive Fixes

ICE Fixes

Rust 1.78

New Lints

Enhancements

ICE Fixes

Rust 1.77

New Lints

Enhancements

ICE Fixes

Others

Rust 1.76

New Lints

Moves and Deprecations

Enhancements

ICE Fixes

Others

Rust 1.75

New Lints

Moves and Deprecations

Enhancements

Suggestion Fixes/Improvements

ICE Fixes

Documentation Improvements

Rust 1.74

New Lints

Moves and Deprecations

Enhancements

ICE Fixes

Rust 1.73

New Lints

Moves and Deprecations

Enhancements

False Positive Fixes

Suggestion Fixes/Improvements

ICE Fixes

Rust 1.72

New Lints

Moves and Deprecations

Enhancements

False Positive Fixes

Suggestion Fixes/Improvements

Documentation Improvements

Rust 1.71

New Lints

Moves and Deprecations

Enhancements

Documentation Improvements

Rust 1.70

New Lints

Moves and Deprecations

Enhancements

False Positive Fixes

Suggestion Fixes/Improvements

ICE Fixes

Others

Rust 1.69

New Lints

Moves and Deprecations

354 KiB

Raw Blame History