All notable changes to this project will be documented in this file. See Changelog Update if you want to update this document.
Current beta, release 2020-07-16
match_wildcard_for_single_variants #5582unsafe_derive_deserialize #5493if_let_mutex #5332mismatched_target_os #5506await_holding_lock #5439match_on_vec_items #5522manual_async_fn #5576reversed_empty_ranges #5583manual_non_exhaustive #5550match_bool to pedantic #5408match_wild_err_arm to pedantic and update help messages. #5622useless_let_if_seq to nursery. #5599option_and_then_some and rename to bind_instead_of_map. #5529identity_conversion to useless_conversion. #5568block_in_if_condition_expr and block_in_if_condition_stmt into blocks_in_if_conditions. #5563option_map_unwrap_or, option_map_unwrap_or_else and result_map_unwrap_or_else into map_unwrap_or. #5563option_unwrap_used and result_unwrap_used into unwrap_used. #5563option_expect_used and result_expect_used into expect_used. #5563for_loop_over_option and for_loop_over_result into for_loops_over_fallibles. #5563useless_conversion with TryFrom and TryInto. #5631unused_unit. #5592Default in new_without_default. #5616while_let_on_iterator #5525empty_line_after_outer_attr #5609unnecessary_unwrap #5558comparison_chain #5596used_underscore_binding in await desugaring. #5535borrowed_box on mutable references. #54911 << 0 in identity_op. #5602use super::*; glob imports in wildcard_imports. #5564doc_markdown. #5611multiple_crate_versions. #5636allow attribute on arguments in ptr_arg. #5647redundant_field_names, just_underscores_and_digits, many_single_char_names and similar_names. #5651len in or_fun_call. #4429manual_memcpy. #5536redundant_pattern_matching for macros. #5511copied() for mutable references in map_clone. #5530clone_double_ref. #5547unnecessary_mut_passed. #5639unneeded_field_pattern. #5541Current stable, released 2020-06-04
explicit_deref_methods #5226implicit_saturating_sub #5427macro_use_imports #5230verbose_file_reads #5272future_not_send #5423redundant_pub_crate #5319large_const_arrays #5248result_map_or_into_option #5415redundant_allocation #5349fn_address_comparisons #5294vtable_address_comparisons #5294replace_consts lint #5380cognitive_complexity to nursery #5428useless_transmute to nursery #5364inefficient_to_string to pedantic #5412option_option to pedantic #5401unreadable_literal to pedantic #5419let_unit_value to pedantic #5409trivially_copy_pass_by_ref to pedantic #5410implicit_hasher to pedantic #5411cargo clippy --fix -Z unstable-options to auto-fix lints that support this #5363redundant_clone also trigger on cases where the cloned value is not consumed. #5304integer_arithmetic to also disallow bit-shifting #5430option_as_ref_deref now detects more deref cases #5425large_enum_variant now report the sizes of the largest and second-largest variants #5466bool_comparison now also checks for inequality comparisons that can be written more concisely #5365clone_on_copy to work in method call arguments as well #5441redundant_pattern_matching now also handles while let #5483integer_arithmetic now also lints references of integers #5329float_cmp_const to also work on arrays #5345map_flatten when map is called on an Option #5473many_single_char_names #5468should_implement_trait #5437unused_self #5387redundant_clone #5453precedence #5445suspicious_op_assign_impl #5424needless_lifetimes #5293redundant_pattern #5287inconsistent_digit_grouping #5451question_mark lint suggestion so that it doesn't add redundant as_ref() #5481option_map_unit_fn #5292match_single_binding when triggered inside a closure #5350new_ret_no_self #5448option_option now suggest using a tri-state enum #5403verbose_bit_mask documentation #5454wildcard_imports documentation now mentions that use ...::prelude::* is not linted #5312Released 2020-04-23
imprecise_flops #4897suboptimal_flops #4897wildcard_imports #5029single_component_path_imports #5058match_single_binding #5061let_underscore_lock #5101struct_excessive_bools #5125fn_params_excessive_bools #5125option_env_unwrap #5148lossy_float_literal #5202rest_pat_in_fully_bound_structs #5258unneeded_field_pattern to pedantic group #5200missing_errors_doc lint also trigger on async functions #5181approx_constant #5193question_mark lint #5266misc_early lints #5129missing_errors_doc #5213usizes #5256iter_nth_zeroReleased 2020-03-12
filetype_is_file #4543let_underscore_must_use #4823modulo_arithmetic #4867mem_replace_with_default #4881mutable_key_type #4885option_as_ref_deref #4945wildcard_in_or_patterns #4960iter_nth_zero #4966invalid_atomic_ordering #4999skip_while_next #5067transmute_float_to_int from nursery to complexity group #5015range_plus_one to pedantic group #5057debug_assert_with_mut_call to nursery group #5106unused_label #4930unused_io_amount #5027vec_box configurable by adding a size threshold #5081cmp_nan #4910expect_fun_call #4915redundant_clone #5017map_clone #4937replace_consts #4977let_and_return #5008eq_op #5079possible_missing_comma #5083debug_assert_with_mut_call #5106let_underscore_must_use in external macros #5082empty_loop in no_std crates #5086option_map_unwrap_or #4634wildcard_enum_match_arm #4934cognitive_complexity #4935decimal_literal_representation #4956unknown_clippy_lints #4963explicit_into_iter_loop #4978useless_attribute #5022if_let_some_result #5032empty_enum, replace_consts, redundant_clone, and iterator_step_by_zeroReleased 2020-01-30
use_self to nursery group #4863into_iter_on_array #4788string_lit_as_bytes to also trigger when literal has escapes #4808comparison_chain #4842while_immutable_condition #4730explicit_counter_loop #4803must_use_candidate #4794print_with_newline and write_with_newline #4769derive_hash_xor_eq #4766missing_inline_in_public_items #4870string_add #4880float_arithmetic #4851cast_sign_loss #4883manual_swap #4877use_self #4776const_generics #4780clippy-driver without arguments, instead of ICEing #4810Released 2019-12-19
unneeded_wildcard_pattern #4537needless_doctest_main #4603suspicious_unary_op_formatting #4615debug_assert_with_mut_call #4680unused_self #4619inefficient_to_string #4683must_use_unit #4560must_use_candidate #4560double_must_use #4560comparison_chain #4569unsound_collection_transmute #4592panic #4657unreachable #4657todo #4657option_expect_used #4657result_expect_used #4657redundant_clone to perf group #4509manual_mul_add to nursery group #4736unit_cmp to also work with assert_eq!, debug_assert_eq!, assert_ne! and debug_assert_ne! #4613integer_arithmetic to also detect mutating arithmetic like += #4585nonminimal_bool #4568missing_safety_doc #4611cast_sign_loss #4614redundant_clone #4509try_err #4721toplevel_ref_arg #4570multiple_inherent_impl #4593cargo fix --clippy #4575zero_ptr #4599explicit_counter_loop #4691mul_add #4602assertions_on_constants #4635use_self #4671Released 2019-11-07
unused_collect lint. This is fully covered by rustc's #[must_use] on collect #4348type_repetition_in_bounds to pedantic group #4403cast_lossless to pedantic group #4539temporary_cstring_as_ptr now catches more cases #4425use_self now works in constructors, too #4525cargo_common_metadata now checks for license files #4518cognitive_complexity now includes the measured complexity in the warning message #4469block_in_if_* lints #4458cast_lossless #4473clone_on_copy #4411deref_addrof #4487too_many_lines #4490new_ret_no_self #4365manual_swap #4478missing_const_for_fn #4450extra_unused_lifetimes #4477inherent_to_string #4460map_entry #4495unused_unit #4445redundant_pattern #4489wrong_self_convention #4369cargo fix --clippy #4558redundant_pattern_matching #4352explicit_write #4544or_fun_call #4522match_as_ref #4446unnecessary_fold_span #4382unseparated_literal_suffix #4401char_lit_as_u8 #4418Released 2019-09-26
{unnnecessary,panicking}_unwrap out of nursery #4307use_self lint to suggest uses of Self::Variant #4308let_unit #4337pub_enum_variant_names and enum_variant_names #4345cast_ptr_alignment #4257string_lit_as_bytes #4233needless_lifetimes #4266float_cmp #4275needless_return #4274match_same_arms #4246needless_bool #4335cast_ptr_alignment #4257single_char_literal #4361len_zero #4314implicit_hasher #4268trivially_copy_pass_by_ref #4250Released 2019-08-15
const_static_lifetime is now called redundant_static_lifetimes. The lint now covers statics in addition to consts #4162match_same_arms now warns for all identical arms, instead of only the first one #4102needless_return now works with void functions #4220redundant_closure #4190useless_attribute #4107float_cmp #4214print_with_newline and write_with_newline #4136option_map_unwrap_or_else and result_map_unwrap_or_else #4164non_ascii_literal #4119let_and_return #4137trivially_copy_pass_by_ref #4071unreadable_literal #4099Released 2019-07-04
find_map, filter_map_next #4039path_buf_push_overwrite #3954path_buf_push_overwrite to the nursery #4013redundant_closure into redundant_closure and redundant_closure_for_method_calls #4110toplevel_ref_arg lint #4007or_fun_call pertaining to nested constructors #4084or_fun_call pertaining to enum variant constructors #4018useless_let_if_seq pertaining to interior mutability #4035redundant_closure pertaining to non-function types #4008let_and_return pertaining to attributes on lets #4024module_name_repetitions lint pertaining to attributes #4006assertions_on_constants pertaining to debug_assert! #3989map_clone to suggest .copied() where applicable #3970 #4043search_is_some #4049naive_bytecount #3984while_let_loop #3975too_many_arguments #4053cast_lossless #4021unnecessary_cast #4026approx_constant‘s documentation’s “Known problems” section. #4027suspicious_else_formatting #3960decimal_literal_representation #3931Released 2019-05-20
drop_bounds to detect T: Drop boundsredundant_closure into redundant_closure and redundant_closure_for_method_calls #4110cyclomatic_complexity to cognitive_complexity, start work on making lint more practical for Rust codeget_unwrap to the restriction categoryiter_cloned_collectcast_lossless to suggest suffixed literalsprint_with_newline and write_with_newline pertaining to raw stringsneedless_range_loop pertaining to structs without a .iter()bool_comparison pertaining to non-bool typesredundant_closure pertaining to differences in borrowsoption_map_unwrap_or on non-copy typesmissing_const_for_fn pertaining to macros and trait method implsneedless_pass_by_value pertaining to procedural macrosneedless_continue pertaining to loop labelsboxed_local pertaining to arguments moved into closuresuse_self in nested functionsexpect_fun_call (https://github.com/rust-lang/rust-clippy/pull/3846)explicit_counter_loop to deal with parenthesizing range variablessingle_char_pattern to correctly escape single quotesredundant_closure in macrosReleased 2019-04-10
assertions_on_constants to detect for example assert!(true)dbg_macro to detect uses of the dbg! macromissing_const_for_fn that can suggest functions to be made consttoo_many_lines to detect functions with excessive LOC. It can be configured using the too-many-lines-threshold configuration.wildcard_enum_match_arm to check for wildcard enum matches using _redundant_closure to also work for methods (not only functions)vec_box, needless_pass_by_value and implicit_hashercast_sign_lossinteger_arithmeticunit_argimplicit_returnexplicit_writequestion_mark lintcast_losslessexpect_fun_callneedless_boolneedless_range_loopuse_selfwhile_let_on_iteratorReleased 2019-02-26
implicit_return, vec_box, cast_ref_to_mutrust-clippy repository is now part of the rust-lang org.stutter to module_name_repetitionsnew_without_default_derive into new_without_default lintlarge_digit_groups from style group to pedanticbool_comparison to check for <, <=, >, >=, and != comparisons against booleansno_effect to detect writes to constants such as A_CONST.field = 2redundant_clone to work on struct fieldssuspicious_else_formatting to detect if .. {..} {..}use_self to work on tuple structs and also in local macrosresult_map_unit_fn and option_map_unit_fnimplicit_returnuse_selfclone_on_copydoc_markdownempty_loopif_same_then_elseinfinite_iterquestion_markuseless_asrefwildcard_dependencieswrite_with_newlineexplicit_writequestion_mark lintget_unwrapReleased 2019-01-17
slow_vector_initialization, mem_discriminant_non_enum, redundant_clone, wildcard_dependencies, into_iter_on_ref, into_iter_on_array, deprecated_cfg_attr, mem_discriminant_non_enum, cargo_common_metadatau128 and i128 to integer related lintsmistyped_literal_suffixesuse_selfmissing_commanew_ret_no_selfpossible_missing_commainteger_arithmetic in constant itemsneedless_borrowout_of_bounds_indexingnew_without_default_derivestring_lit_as_bytesout_of_bounds_indexinguse_self. It will now also check existential typesredundant_closure_callbool_comparison triggering 3 times on on on the same codetrivially_copy_pass_by_ref to work on trait methodsneedless_range_loopneedless_pass_by_value from pedantic group to styleReleased 2018-12-06
rustup component add clippy.redundant_pattern_matching, unnecessary_filter_map, unused_unit, map_flatten, mem_replace_option_with_noneif_let_redundant_pattern_matchingneedless_pass_by_value when encountering a generic function argument with a lifetime parameterneedless_range_loopsingle_char_pattern when encountering a constant valueassign_op_patternboxed_local on trait implementationscmp_ownedcollapsible_if when conditionals have commentsdouble_parensexcessive_precisionexplicit_counter_loopfn_to_numeric_cast_with_truncationmap_clonenew_ret_no_selfnew_without_default when new is unsafetype_complexity when using extern typesuseless_formatwrong_self_conventionexcessive_precisionexpect_fun_callget_unwrapuseless_formatfn_to_numeric_cast_with_truncation lint can be disabled againmanual_memcpyneedless_lifetimesReleased 2018-10-25
assign_ops lintmistyped_literal_suffixes, ptr_offset_with_cast, needless_collect, copy_iteratorcargo clippy -V now includes the Clippy commit hash of the Rust Clippy componentimplicit_hasherprintln!("{}" a);default_trait_accesstrivially_copy_pass_by_refsimilar_namesredundant_field_nameexpect_fun_callidentity_conversionexplicit_counter_looprange_plus_one suggestion and false negativeprint_with_newline / write_with_newline: don't warn about string with several \ns in themuseless_attribute to also whitelist unused_extern_cratessingle_char_patternidentity_conversion lintexplicit_iter_loop and explicit_into_iter_loop from style group to pedanticrange_plus_one and range_minus_one from nursery group to complexityshadow_unrelated from restriction group to pedanticindexing_slicing from pedantic group to restrictionReleased 2018-09-13
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.while let (..) = x.iter() constructuse_selftrivially_copy_pass_by_refuseless_attribute lintprint_literaluse_self regressionsneg_cmp_op_on_partial_ordsingle_char_patternunused_lifetimes to extra_unused_lifetimes because of naming conflict with new rustc lintclippy::cyclomatic_complexity instead of clippy(cyclomatic_complexity)cast_ptr_alignment, transmute_ptr_to_ptr, write_literal, write_with_newline, writeln_empty_stringprint_literalwhile_immutable_conditionredundant_field_names, suspicious_arithmetic_impl, suspicious_op_assign_implquestion_markdouble_comparisons, empty_line_after_outer_attrmisaligned_transmutedecimal_literal_representationelse_if_without_else, option_option, unit_arg, unnecessary_foldunit_exprneedless_pass_by_valuematch_as_refjust_underscores_and_digits, result_map_unwrap_or_else, transmute_bytes_to_strconst_static_lifetime, erasing_op, fallible_impl_from, println_empty_string, useless_asrefexplicit_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_floatmut_range_boundint_plus_onechars_last_cmpneedless_borrow, ptr_arg,clone_on_ref_ptrmanual_memcpycast_lossless no longer has redundant parentheses in its suggestionsunit_exprinfinite_iter, maybe_infinite_iter, cast_losslessuse_self triggering inside derivescargo clippy --allnaive_bytecountuse_selfunreadable_literal, inconsistent_digit_grouping, large_digit_groupsinline_alwayspanic_paramscargo clippy crashing on dylib projectsnested_while_let and never_loopdoc_markdown lint.range_step_by_zeroiterator_step_by_zeroneedless_borrowed_referenceAsRef/AsMut arguments in wrong_self_conventionneedless_continueop_refcargo clippy on 64 bit windows systemszero_ptr, never_loop, mut_from_reflarge_enum_variantexplicit_into_iter_loop provides suggestionsCargo.toml&&mut by &reffor (_, x) in &mut hash_map -> for x in hash_map.values_mut()unused_io_amount, forget_ref, short_circuit_statementwrong_self_conventionderef_addrof, double_parens, pub_enum_variant_namesnew_without_defaultabsurd_extreme_comparisonsstring_extend_charsget_unwrap--sysroot, which broke cargo clippycargo clippy defines a cargo-clippy feature. This was previously added for a short time under the name clippy but removed for compatibility.cargo clippy --help is more helping (and less helpful :smile:)if_let_redundant_pattern_matching, partialeq_ne_impliter_skip_nextoption_map_unwrap_or and option_map_unwrap_or_else are now allowed by default.explicit_into_iter_loopclippy 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.builtin_type_shadowzero_prefixed_literal and 0b/0omissing_docs_in_private_items, zero_prefixed_literaluseless_attributeuseless_attribute ignores unused_imports on use statementsprint_with_newline, useless_attributemodule_inceptioneval_order_dependence, mixed_case_hex_literals, unseparated_literal_suffixtoo_many_argumentsneedless_borrowclone_on_copywrong_self_conventionmisrefactored_assign_op, serde_api_misusewrong_transmute, double_neg, filter_mapcargo clippy does not defines the clippy feature introduced in 0.0.76 anymorecollapsible_if now considers if letstutter and iter_nthcargo clippy now automatically defines the clippy featurenot_unsafe_ptr_arg_derefcargo-clippy JSON parsingCLIPPY_DISABLE_DOCS_LINKS environment variable to deactivate the “for further information visit lint-link” message.useless_let_if_sequseless_let_if_sequseless_let_if_seqinvalid_regex and trivial_regex can now warn on RegexSet::new, RegexBuilder::new and byte regexesused_underscore_binding has been made Allow temporarilyunnecessary_operationcargo clippy subcommandassign_op_pattern, assign_ops, needless_borrowfloat_arithmetic, integer_arithmetictemporary_cstring_as_ptr, unsafe_removed_from_name, and mem_forgetinvalid_upcast_comparisonslogic_bug, nonminimal_boolmatch_same_arms now ignores arms with guardsuseless_vec now warns on for … in vec![…]doc_markdownstr_to_string, string_to_string, unstable_as_slice, unstable_as_mut_slicecrosspointer_transmutemany_single_char_names and similar_namesstr to types considered by len_zeroindexing_slicingoverflow_check_conditional, unused_label, new_without_defaultneedless_range_loop with globalsredundant_closure_call