rust/CHANGELOG.md

Changelog

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

Unreleased / In Rust Nightly

57b3c4b...master

Rust 1.60 (beta)

Current beta, release 2022-04-07

0eff589...57b3c4b

New Lints

• single_char_lifetime_names #8236
• iter_overeager_cloned #8203
• transmute_undefined_repr #8398
• default_union_representation #8289
• manual_bits #8213
• borrow_as_ptr #8210

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 excapes 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

Current stable, release 2022-02-24

e181011...0eff589

New Lints

• index_refutable_slice #7643
• needless_splitn #7896
• unnecessary_to_owned #7978
• needless_late_init #7995
• octal_escapes #8007
• return_self_not_must_use #8071
• init_numbered_fields #8170

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

• undocumented_unsafe_blocks #7945 #7988
• unnecessary_cast #8167

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

00e31fa...e181011

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

• transmute_num_to_bytes #7805
• match_str_case_mismatch #7806
• format_in_format_args, to_string_in_format_args #7743
• uninit_vec #7682
• fn_to_numeric_cast_any #7705
• undocumented_unsafe_blocks #7748
• trailing_empty_array #7838
• string_slice #7878

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

7bfc26e...00e31fa

New Lints

• negative_feature_names #7539
• redundant_feature_names #7539
• mod_module_files #7543
• self_named_module_files #7543
• manual_split_once #7565
• derivable_impls #7570
• needless_option_as_deref #7596
• iter_not_returning_iterator #7610
• same_name_method #7653
• manual_assert #7669
• non_send_fields_in_send_ty #7709
• equatable_if_let #7762

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

74d1561...7bfc26e

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

3ae8faf...74d1561

Important Changes

• Stabilized cargo clippy --fix 🎉 #7405

New Lints

• rc_mutex #7316
• nonstandard_macro_braces #7299
• strlen_on_c_strings #7243
• self_named_constructors #7403
• disallowed_script_idents #7400
• disallowed_types #7315
• missing_enforced_import_renames #7300
• extend_with_drain #7270

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
• blacklisted_name: Now allows blacklisted 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

• zero_sized_map_values #7470
• redundant_pattern_matching #7471
• modulo_one #7473
• use_self #7428

Rust 1.54

Released 2021-07-29

7c7683c...3ae8faf

New Lints

• ref_binding_to_reference #7105
• needless_bitwise_bool #7133
• unused_async #7225
• manual_str_repeat #7265
• suspicious_splitn #7292

Moves and Deprecations

• Deprecate pub_enum_variant_names and wrong_pub_self_convention in favor of the new avoid-breaking-exported-api config option (see Enhancements) #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

6ed6f1e...7c7683c

New Lints

• option_filter_map #6342
• branches_sharing_code #6463
• needless_for_each #6706
• if_then_some_else_none #6859
• non_octal_unix_permissions #7001
• unnecessary_self_imports #7072
• bool_assert_comparison #7083
• cloned_instead_of_copied #7098
• flat_map_option #7101

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

• macro_use_imports #7022
• missing_panics_doc #7034
• tabs_in_doc_comments #7039
• missing_const_for_fn #7128

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

3e41797...6ed6f1e

New Lints

• from_str_radix_10 #6717
• implicit_clone #6730
• semicolon_if_nothing_returned #6681
• manual_flatten #6646
• inconsistent_struct_constructor #6769
• iter_count #6791
• default_numeric_fallback #6662
• bytes_nth #6695
• filter_map_identity #6685
• manual_map #6573

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

4911ab1...3e41797

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

b20d4c1...4bd77a1

New Lints

• suspicious_operation_groupings #6086
• size_of_in_element_count #6394
• unnecessary_wraps #6070
• let_underscore_drop #6305
• collapsible_match #6402
• redundant_else #6330
• zero_sized_map_values #6218
• print_stderr #6367
• string_from_utf8_as_bytes #6134

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

e636b88...b20d4c1

New Lints

• field_reassign_with_default #5911
• await_holding_refcell_ref #6029
• disallowed_methods #6081
• inline_asm_x86_att_syntax #6092
• inline_asm_x86_intel_syntax #6092
• from_iter_instead_of_collect #6101
• mut_mutex_lock #6103
• single_element_loop #6109
• manual_unwrap_or #6123
• large_types_passed_by_value #6135
• result_unit_err #6157
• ref_option_ref #6165
• manual_range_contains #6177
• unusual_byte_groupings #6183
• comparison_to_empty #6226
• map_collect_result_unit #6227
• manual_ok_or #6233

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

09bd400...e636b88

New lints

• self_assignment #5894
• unnecessary_lazy_evaluations #5720
• manual_strip #6038
• map_err_ignore #5998
• rc_buffer #6044
• to_string_in_display #5831
• single_char_push_str #5881

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

c2c07fa...09bd400

New lints

• derive_ord_xor_partial_ord #5848
• trait_duplication_in_bounds #5852
• map_identity #5694
• unit_return_expecting_ord #5737
• pattern_type_mismatch #4841
• repeat_once #5773
• same_item_push #5825
• needless_arbitrary_self_type #5869
• match_like_matches_macro #5769
• stable_sort_primitive #5809
• blanket_clippy_restriction_lints #5750
• option_if_let_else #5301

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

7ea7cd1...c2c07fa

New lints

• unnested_or_patterns #5378
• iter_next_slice #5597
• unnecessary_sort_by #5623
• vec_resize_to_zero #5637

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
• blacklisted_name: 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

891e1a8...7ea7cd1

New lints

• match_wildcard_for_single_variants #5582
• unsafe_derive_deserialize #5493
• if_let_mutex #5332
• mismatched_target_os #5506
• await_holding_lock #5439
• match_on_vec_items #5522
• manual_async_fn #5576
• reversed_empty_ranges #5583
• manual_non_exhaustive #5550

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

204bb9b...891e1a8

New lints

• explicit_deref_methods #5226
• implicit_saturating_sub #5427
• macro_use_imports #5230
• verbose_file_reads #5272
• future_not_send #5423
• redundant_pub_crate #5319
• large_const_arrays #5248
• result_map_or_into_option #5415
• redundant_allocation #5349
• fn_address_comparisons #5294
• vtable_address_comparisons #5294

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

• many_single_char_names #5468
• should_implement_trait #5437
• unused_self #5387
• redundant_clone #5453
• precedence #5445
• suspicious_op_assign_impl #5424
• needless_lifetimes #5293
• redundant_pattern #5287
• inconsistent_digit_grouping #5451

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

4ee1206...204bb9b

New lints

• imprecise_flops #4897
• suboptimal_flops #4897
• wildcard_imports #5029
• single_component_path_imports #5058
• match_single_binding #5061
• let_underscore_lock #5101
• struct_excessive_bools #5125
• fn_params_excessive_bools #5125
• option_env_unwrap #5148
• lossy_float_literal #5202
• rest_pat_in_fully_bound_structs #5258

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

• use_debug #5047
• unnecessary_unwrap #5132
• zero_prefixed_literal #5170
• missing_const_for_fn #5216

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

69f99e7...4ee1206

New lints

• filetype_is_file #4543
• let_underscore_must_use #4823
• modulo_arithmetic #4867
• mem_replace_with_default #4881
• mutable_key_type #4885
• option_as_ref_deref #4945
• wildcard_in_or_patterns #4960
• iter_nth_zero #4966
• invalid_atomic_ordering #4999
• skip_while_next #5067

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

• option_map_unwrap_or #4634
• wildcard_enum_match_arm #4934
• cognitive_complexity #4935
• decimal_literal_representation #4956
• unknown_clippy_lints #4963
• explicit_into_iter_loop #4978
• useless_attribute #5022
• if_let_some_result #5032

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

c8e3cfb...69f99e7

• 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

4e7e71b...c8e3cfb

• 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

3aea860...4e7e71b

• 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

e3cb40e...3aea860

• New Lints:
  • main_recursion #4203
  • inherent_to_string #4259
  • inherent_to_string_shadow_display #4259
  • type_repetition_in_bounds #3766
  • try_err #4222
• Move {unnnecessary,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

082cfa7...e3cb40e

• New Lints:
  • checked_conversions #4088
  • get_last_with_len #3832
  • integer_division #4195
• 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

eb9f9b1...082cfa7

• 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

1b89724...1fac380

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

Rust 1.33

Released 2019-02-26

b2601be...1b89724

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

Rust 1.32

Released 2019-01-17

2e26fdc2...b2601be

• 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

14207503...125907ad

• Deprecate assign_ops lint
• New lints: mistyped_literal_suffixes, ptr_offset_with_cast, needless_collect, copy_iterator
• cargo clippy -V now includes the Clippy commit hash of the Rust Clippy component
• Fix ICE in implicit_hasher
• Fix ICE when encountering println!("{}" a);
• Fix ICE when encountering a macro call in match statements
• Fix false positive in default_trait_access
• Fix false positive in trivially_copy_pass_by_ref
• Fix false positive in similar_names
• Fix false positive in redundant_field_name
• Fix false positive in expect_fun_call
• Fix false negative in identity_conversion
• Fix false negative in explicit_counter_loop
• Fix range_plus_one suggestion and false negative
• print_with_newline / write_with_newline: don't warn about string with several \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