All notable changes to this project will be documented in this file.
Current beta
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_fn_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 #3931Current stable, released 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_expr]needless_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_expr]infinite_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