--- /dev/null
- * [`ref_in_deref`] Use parentheses correctly in suggestion
+# Changelog
+
+All notable changes to this project will be documented in this file.
+See [Changelog Update](doc/changelog_update.md) if you want to update this
+document.
+
+## Unreleased / In Rust Nightly
+
+[e181011...master](https://github.com/rust-lang/rust-clippy/compare/e181011...master)
+
+## Rust 1.58 (beta)
+
+Current beta, release 2022-01-13
+
+[00e31fa...e181011](https://github.com/rust-lang/rust-clippy/compare/00e31fa...e181011)
+
+### New lints
+
+* [`transmute_num_to_bytes`]
+ [#7805](https://github.com/rust-lang/rust-clippy/pull/7805)
+* [`match_str_case_mismatch`]
+ [#7806](https://github.com/rust-lang/rust-clippy/pull/7806)
+* [`format_in_format_args`], [`to_string_in_format_args`]
+ [#7743](https://github.com/rust-lang/rust-clippy/pull/7743)
+* [`uninit_vec`]
+ [#7682](https://github.com/rust-lang/rust-clippy/pull/7682)
+* [`fn_to_numeric_cast_any`]
+ [#7705](https://github.com/rust-lang/rust-clippy/pull/7705)
+* [`undocumented_unsafe_blocks`]
+ [#7748](https://github.com/rust-lang/rust-clippy/pull/7748)
+* [`trailing_empty_array`]
+ [#7838](https://github.com/rust-lang/rust-clippy/pull/7838)
+* [`string_slice`]
+ [#7878](https://github.com/rust-lang/rust-clippy/pull/7878)
+
+### Moves or deprecations of lints
+
+* Move [`non_send_fields_in_send_ty`] to `suspicious`
+ [#7874](https://github.com/rust-lang/rust-clippy/pull/7874)
+* Move [`non_ascii_literal`] to `restriction`
+ [#7907](https://github.com/rust-lang/rust-clippy/pull/7907)
+
+### Changes that expand what code existing lints cover
+
+* [`question_mark`] now covers `Result`
+ [#7840](https://github.com/rust-lang/rust-clippy/pull/7840)
+* Make [`useless_format`] recognize bare `format!("")`
+ [#7801](https://github.com/rust-lang/rust-clippy/pull/7801)
+* Lint on underscored variables with no side effects in [`no_effect`]
+ [#7775](https://github.com/rust-lang/rust-clippy/pull/7775)
+* Expand [`match_ref_pats`] to check for multiple reference patterns
+ [#7800](https://github.com/rust-lang/rust-clippy/pull/7800)
+
+### False positive fixes
+
+* Fix false positive of [`implicit_saturating_sub`] with `else` clause
+ [#7832](https://github.com/rust-lang/rust-clippy/pull/7832)
+* Fix [`question_mark`] when there is call in conditional predicate
+ [#7860](https://github.com/rust-lang/rust-clippy/pull/7860)
+* [`mut_mut`] no longer lints when type is defined in external macros
+ [#7795](https://github.com/rust-lang/rust-clippy/pull/7795)
+* Avoid [`eq_op`] in test functions
+ [#7811](https://github.com/rust-lang/rust-clippy/pull/7811)
+* [`cast_possible_truncation`] no longer lints when cast is coming from `signum`
+ method call [#7850](https://github.com/rust-lang/rust-clippy/pull/7850)
+* [`match_str_case_mismatch`] no longer lints on uncased characters
+ [#7865](https://github.com/rust-lang/rust-clippy/pull/7865)
+* [`ptr_arg`] no longer lints references to type aliases
+ [#7890](https://github.com/rust-lang/rust-clippy/pull/7890)
+* [`missing_safety_doc`] now also accepts "implementation safety" headers
+ [#7856](https://github.com/rust-lang/rust-clippy/pull/7856)
+* [`missing_safety_doc`] no longer lints if any parent has `#[doc(hidden)]`
+ attribute [#7849](https://github.com/rust-lang/rust-clippy/pull/7849)
+* [`if_not_else`] now ignores else-if statements
+ [#7895](https://github.com/rust-lang/rust-clippy/pull/7895)
+* Avoid linting [`cast_possible_truncation`] on bit-reducing operations
+ [#7819](https://github.com/rust-lang/rust-clippy/pull/7819)
+* Avoid linting [`field_reassign_with_default`] when `Drop` and `Copy` are
+ involved [#7794](https://github.com/rust-lang/rust-clippy/pull/7794)
+* [`unnecessary_sort_by`] now checks if argument implements `Ord` trait
+ [#7824](https://github.com/rust-lang/rust-clippy/pull/7824)
+* Fix false positive in [`match_overlapping_arm`]
+ [#7847](https://github.com/rust-lang/rust-clippy/pull/7847)
+* Prevent [`needless_lifetimes`] false positive in `async` function definition
+ [#7901](https://github.com/rust-lang/rust-clippy/pull/7901)
+
+### Suggestion fixes/improvements
+
+* Keep an initial `::` when [`doc_markdown`] suggests to use ticks
+ [#7916](https://github.com/rust-lang/rust-clippy/pull/7916)
+* Add a machine applicable suggestion for the [`doc_markdown`] missing backticks
+ lint [#7904](https://github.com/rust-lang/rust-clippy/pull/7904)
+* [`equatable_if_let`] no longer expands macros in the suggestion
+ [#7788](https://github.com/rust-lang/rust-clippy/pull/7788)
+* Make [`shadow_reuse`] suggestion less verbose
+ [#7782](https://github.com/rust-lang/rust-clippy/pull/7782)
+
+### ICE fixes
+
+* Fix ICE in [`enum_variant_names`]
+ [#7873](https://github.com/rust-lang/rust-clippy/pull/7873)
+* Fix ICE in [`undocumented_unsafe_blocks`]
+ [#7891](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/7827)
+* Fix typo in example for [`match_result_ok`]
+ [#7815](https://github.com/rust-lang/rust-clippy/pull/7815)
+
+### Others
+
+* Allow giving reasons for [`disallowed_types`]
+ [#7791](https://github.com/rust-lang/rust-clippy/pull/7791)
+* Fix [`manual_assert`] and [`match_wild_err_arm`] for `#![no_std]` and Rust
+ 2021. [#7851](https://github.com/rust-lang/rust-clippy/pull/7851)
+* Fix regression in [`semicolon_if_nothing_returned`] on macros containing while
+ loops [#7789](https://github.com/rust-lang/rust-clippy/pull/7789)
+* Added a new configuration `literal-suffix-style` to enforce a certain style
+ writing [`unseparated_literal_suffix`]
+ [#7726](https://github.com/rust-lang/rust-clippy/pull/7726)
+
+## Rust 1.57
+
+Current stable, released 2021-12-02
+
+[7bfc26e...00e31fa](https://github.com/rust-lang/rust-clippy/compare/7bfc26e...00e31fa)
+
+### New Lints
+
+* [`negative_feature_names`]
+ [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
+* [`redundant_feature_names`]
+ [#7539](https://github.com/rust-lang/rust-clippy/pull/7539)
+* [`mod_module_files`]
+ [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
+* [`self_named_module_files`]
+ [#7543](https://github.com/rust-lang/rust-clippy/pull/7543)
+* [`manual_split_once`]
+ [#7565](https://github.com/rust-lang/rust-clippy/pull/7565)
+* [`derivable_impls`]
+ [#7570](https://github.com/rust-lang/rust-clippy/pull/7570)
+* [`needless_option_as_deref`]
+ [#7596](https://github.com/rust-lang/rust-clippy/pull/7596)
+* [`iter_not_returning_iterator`]
+ [#7610](https://github.com/rust-lang/rust-clippy/pull/7610)
+* [`same_name_method`]
+ [#7653](https://github.com/rust-lang/rust-clippy/pull/7653)
+* [`manual_assert`] [#7669](https://github.com/rust-lang/rust-clippy/pull/7669)
+* [`non_send_fields_in_send_ty`]
+ [#7709](https://github.com/rust-lang/rust-clippy/pull/7709)
+* [`equatable_if_let`]
+ [#7762](https://github.com/rust-lang/rust-clippy/pull/7762)
+
+### Moves and Deprecations
+
+* Move [`shadow_unrelated`] to `restriction`
+ [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
+* Move [`option_if_let_else`] to `nursery`
+ [#7568](https://github.com/rust-lang/rust-clippy/pull/7568)
+* Move [`branches_sharing_code`] to `nursery`
+ [#7595](https://github.com/rust-lang/rust-clippy/pull/7595)
+* Rename `if_let_some_result` to [`match_result_ok`] which now also handles
+ `while let` cases [#7608](https://github.com/rust-lang/rust-clippy/pull/7608)
+* Move [`many_single_char_names`] to `pedantic`
+ [#7671](https://github.com/rust-lang/rust-clippy/pull/7671)
+* Move [`float_cmp`] to `pedantic`
+ [#7692](https://github.com/rust-lang/rust-clippy/pull/7692)
+* Rename `box_vec` to [`box_collection`] and lint on more general cases
+ [#7693](https://github.com/rust-lang/rust-clippy/pull/7693)
+* Uplift `invalid_atomic_ordering` to rustc
+ [rust-lang/rust#84039](https://github.com/rust-lang/rust/pull/84039)
+
+### Enhancements
+
+* Rewrite the `shadow*` lints, so that they find a lot more shadows and are not
+ limited to certain patterns
+ [#7338](https://github.com/rust-lang/rust-clippy/pull/7338)
+* The `avoid-breaking-exported-api` configuration now also works for
+ [`box_collection`], [`redundant_allocation`], [`rc_buffer`], [`vec_box`],
+ [`option_option`], [`linkedlist`], [`rc_mutex`]
+ [#7560](https://github.com/rust-lang/rust-clippy/pull/7560)
+* [`unnecessary_unwrap`]: Now also checks for `expect`s
+ [#7584](https://github.com/rust-lang/rust-clippy/pull/7584)
+* [`disallowed_methods`]: Allow adding a reason that will be displayed with the
+ lint message
+ [#7621](https://github.com/rust-lang/rust-clippy/pull/7621)
+* [`approx_constant`]: Now checks the MSRV for `LOG10_2` and `LOG2_10`
+ [#7629](https://github.com/rust-lang/rust-clippy/pull/7629)
+* [`approx_constant`]: Add `TAU`
+ [#7642](https://github.com/rust-lang/rust-clippy/pull/7642)
+* [`needless_borrow`]: Now also lints on needless mutable borrows
+ [#7657](https://github.com/rust-lang/rust-clippy/pull/7657)
+* [`missing_safety_doc`]: Now also lints on unsafe traits
+ [#7734](https://github.com/rust-lang/rust-clippy/pull/7734)
+
+### False Positive Fixes
+
+* [`manual_map`]: No longer lints when the option is borrowed in the match and
+ also consumed in the arm
+ [#7531](https://github.com/rust-lang/rust-clippy/pull/7531)
+* [`filter_next`]: No longer lints if `filter` method is not the
+ `Iterator::filter` method
+ [#7562](https://github.com/rust-lang/rust-clippy/pull/7562)
+* [`manual_flatten`]: No longer lints if expression is used after `if let`
+ [#7566](https://github.com/rust-lang/rust-clippy/pull/7566)
+* [`option_if_let_else`]: Multiple fixes
+ [#7573](https://github.com/rust-lang/rust-clippy/pull/7573)
+ * `break` and `continue` statements local to the would-be closure are
+ allowed
+ * Don't lint in const contexts
+ * Don't lint when yield expressions are used
+ * Don't lint when the captures made by the would-be closure conflict with
+ the other branch
+ * Don't lint when a field of a local is used when the type could be
+ potentially moved from
+ * In some cases, don't lint when scrutinee expression conflicts with the
+ captures of the would-be closure
+* [`redundant_allocation`]: No longer lints on `Box<Box<dyn T>>` which replaces
+ wide pointers with thin pointers
+ [#7592](https://github.com/rust-lang/rust-clippy/pull/7592)
+* [`bool_assert_comparison`]: No longer lints on types that do not implement the
+ `Not` trait with `Output = bool`
+ [#7605](https://github.com/rust-lang/rust-clippy/pull/7605)
+* [`mut_range_bound`]: No longer lints on range bound mutations, that are
+ immediately followed by a `break;`
+ [#7607](https://github.com/rust-lang/rust-clippy/pull/7607)
+* [`mutable_key_type`]: Improve accuracy and document remaining false positives
+ and false negatives
+ [#7640](https://github.com/rust-lang/rust-clippy/pull/7640)
+* [`redundant_closure`]: Rewrite the lint to fix various false positives and
+ false negatives [#7661](https://github.com/rust-lang/rust-clippy/pull/7661)
+* [`large_enum_variant`]: No longer wrongly identifies the second largest
+ variant [#7677](https://github.com/rust-lang/rust-clippy/pull/7677)
+* [`needless_return`]: No longer lints on let-else expressions
+ [#7685](https://github.com/rust-lang/rust-clippy/pull/7685)
+* [`suspicious_else_formatting`]: No longer lints in proc-macros
+ [#7707](https://github.com/rust-lang/rust-clippy/pull/7707)
+* [`excessive_precision`]: No longer lints when in some cases the float was
+ already written in the shortest form
+ [#7722](https://github.com/rust-lang/rust-clippy/pull/7722)
+* [`doc_markdown`]: No longer lints on intra-doc links
+ [#7772](https://github.com/rust-lang/rust-clippy/pull/7772)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_operation`]: Recommend using an `assert!` instead of using a
+ function call in an indexing operation
+ [#7453](https://github.com/rust-lang/rust-clippy/pull/7453)
+* [`manual_split_once`]: Produce semantically equivalent suggestion when
+ `rsplitn` is used [#7663](https://github.com/rust-lang/rust-clippy/pull/7663)
+* [`while_let_on_iterator`]: Produce correct suggestion when using `&mut`
+ [#7690](https://github.com/rust-lang/rust-clippy/pull/7690)
+* [`manual_assert`]: No better handles complex conditions
+ [#7741](https://github.com/rust-lang/rust-clippy/pull/7741)
+* Correctly handle signs in exponents in numeric literals lints
+ [#7747](https://github.com/rust-lang/rust-clippy/pull/7747)
+* [`suspicious_map`]: Now also suggests to use `inspect` as an alternative
+ [#7770](https://github.com/rust-lang/rust-clippy/pull/7770)
+* Drop exponent from suggestion if it is 0 in numeric literals lints
+ [#7774](https://github.com/rust-lang/rust-clippy/pull/7774)
+
+### ICE Fixes
+
+* [`implicit_hasher`]
+ [#7761](https://github.com/rust-lang/rust-clippy/pull/7761)
+
+### Others
+
+* Clippy now uses the 2021
+ [Edition!](https://www.youtube.com/watch?v=q0aNduqb2Ro)
+ [#7664](https://github.com/rust-lang/rust-clippy/pull/7664)
+
+## Rust 1.56
+
+Released 2021-10-21
+
+[74d1561...7bfc26e](https://github.com/rust-lang/rust-clippy/compare/74d1561...7bfc26e)
+
+### New Lints
+
+* [`unwrap_or_else_default`]
+ [#7516](https://github.com/rust-lang/rust-clippy/pull/7516)
+
+### Enhancements
+
+* [`needless_continue`]: Now also lints in `loop { continue; }` case
+ [#7477](https://github.com/rust-lang/rust-clippy/pull/7477)
+* [`disallowed_types`]: Now also primitive types can be disallowed
+ [#7488](https://github.com/rust-lang/rust-clippy/pull/7488)
+* [`manual_swap`]: Now also lints on xor swaps
+ [#7506](https://github.com/rust-lang/rust-clippy/pull/7506)
+* [`map_flatten`]: Now also lints on the `Result` type
+ [#7522](https://github.com/rust-lang/rust-clippy/pull/7522)
+* [`no_effect`]: Now also lints on inclusive ranges
+ [#7556](https://github.com/rust-lang/rust-clippy/pull/7556)
+
+### False Positive Fixes
+
+* [`nonstandard_macro_braces`]: No longer lints on similar named nested macros
+ [#7478](https://github.com/rust-lang/rust-clippy/pull/7478)
+* [`too_many_lines`]: No longer lints in closures to avoid duplicated diagnostics
+ [#7534](https://github.com/rust-lang/rust-clippy/pull/7534)
+* [`similar_names`]: No longer complains about `iter` and `item` being too
+ similar [#7546](https://github.com/rust-lang/rust-clippy/pull/7546)
+
+### Suggestion Fixes/Improvements
+
+* [`similar_names`]: No longer suggests to insert or add an underscore as a fix
+ [#7221](https://github.com/rust-lang/rust-clippy/pull/7221)
+* [`new_without_default`]: No longer shows the full qualified type path when
+ suggesting adding a `Default` implementation
+ [#7493](https://github.com/rust-lang/rust-clippy/pull/7493)
+* [`while_let_on_iterator`]: Now suggests re-borrowing mutable references
+ [#7520](https://github.com/rust-lang/rust-clippy/pull/7520)
+* [`extend_with_drain`]: Improve code suggestion for mutable and immutable
+ references [#7533](https://github.com/rust-lang/rust-clippy/pull/7533)
+* [`trivially_copy_pass_by_ref`]: Now properly handles `Self` type
+ [#7535](https://github.com/rust-lang/rust-clippy/pull/7535)
+* [`never_loop`]: Now suggests using `if let` instead of a `for` loop when
+ applicable [#7541](https://github.com/rust-lang/rust-clippy/pull/7541)
+
+### Documentation Improvements
+
+* Clippy now uses a lint to generate its lint documentation. [Lints all the way
+ down](https://en.wikipedia.org/wiki/Turtles_all_the_way_down).
+ [#7502](https://github.com/rust-lang/rust-clippy/pull/7502)
+* Reworked Clippy's website:
+ [#7172](https://github.com/rust-lang/rust-clippy/issues/7172)
+ [#7279](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/7492)
+* [`unnested_or_patterns`]: Removed `or_patterns` feature gate in the code
+ example [#7507](https://github.com/rust-lang/rust-clippy/pull/7507)
+
+## Rust 1.55
+
+Released 2021-09-09
+
+[3ae8faf...74d1561](https://github.com/rust-lang/rust-clippy/compare/3ae8faf...74d1561)
+
+### Important Changes
+
+* Stabilized `cargo clippy --fix` :tada:
+ [#7405](https://github.com/rust-lang/rust-clippy/pull/7405)
+
+### New Lints
+
+* [`rc_mutex`]
+ [#7316](https://github.com/rust-lang/rust-clippy/pull/7316)
+* [`nonstandard_macro_braces`]
+ [#7299](https://github.com/rust-lang/rust-clippy/pull/7299)
+* [`strlen_on_c_strings`]
+ [#7243](https://github.com/rust-lang/rust-clippy/pull/7243)
+* [`self_named_constructors`]
+ [#7403](https://github.com/rust-lang/rust-clippy/pull/7403)
+* [`disallowed_script_idents`]
+ [#7400](https://github.com/rust-lang/rust-clippy/pull/7400)
+* [`disallowed_types`]
+ [#7315](https://github.com/rust-lang/rust-clippy/pull/7315)
+* [`missing_enforced_import_renames`]
+ [#7300](https://github.com/rust-lang/rust-clippy/pull/7300)
+* [`extend_with_drain`]
+ [#7270](https://github.com/rust-lang/rust-clippy/pull/7270)
+
+### Moves and Deprecations
+
+* Moved [`from_iter_instead_of_collect`] to `pedantic`
+ [#7375](https://github.com/rust-lang/rust-clippy/pull/7375)
+* Added `suspicious` as a new lint group for *code that is most likely wrong or useless*
+ [#7350](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/7262)
+* [`doc_markdown`]:
+ * Now detects unbalanced ticks
+ [#7357](https://github.com/rust-lang/rust-clippy/pull/7357)
+ * Add `FreeBSD` to the default configuration as an allowed identifier
+ [#7334](https://github.com/rust-lang/rust-clippy/pull/7334)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]: Now allows wildcards for enums with unstable
+ or hidden variants
+ [#7407](https://github.com/rust-lang/rust-clippy/pull/7407)
+* [`redundant_allocation`]: Now additionally supports the `Arc<>` type
+ [#7308](https://github.com/rust-lang/rust-clippy/pull/7308)
+* [`blacklisted_name`]: Now allows blacklisted names in test code
+ [#7379](https://github.com/rust-lang/rust-clippy/pull/7379)
+* [`redundant_closure`]: Suggests `&mut` for `FnMut`
+ [#7437](https://github.com/rust-lang/rust-clippy/pull/7437)
+* [`disallowed_methods`], [`disallowed_types`]: The configuration values `disallowed-method` and `disallowed-type`
+ no longer require fully qualified paths
+ [#7345](https://github.com/rust-lang/rust-clippy/pull/7345)
+* [`zst_offset`]: Fixed lint invocation after it was accidentally suppressed
+ [#7396](https://github.com/rust-lang/rust-clippy/pull/7396)
+
+### False Positive Fixes
+
+* [`default_numeric_fallback`]: No longer lints on float literals as function arguments
+ [#7446](https://github.com/rust-lang/rust-clippy/pull/7446)
+* [`use_self`]: No longer lints on type parameters
+ [#7288](https://github.com/rust-lang/rust-clippy/pull/7288)
+* [`unimplemented`]: Now ignores the `assert` and `debug_assert` macros
+ [#7439](https://github.com/rust-lang/rust-clippy/pull/7439)
+* [`branches_sharing_code`]: Now always checks for block expressions
+ [#7462](https://github.com/rust-lang/rust-clippy/pull/7462)
+* [`field_reassign_with_default`]: No longer triggers in macros
+ [#7160](https://github.com/rust-lang/rust-clippy/pull/7160)
+* [`redundant_clone`]: No longer lints on required clones for borrowed data
+ [#7346](https://github.com/rust-lang/rust-clippy/pull/7346)
+* [`default_numeric_fallback`]: No longer triggers in external macros
+ [#7325](https://github.com/rust-lang/rust-clippy/pull/7325)
+* [`needless_bool`]: No longer lints in macros
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`useless_format`]: No longer triggers when additional text is being appended
+ [#7442](https://github.com/rust-lang/rust-clippy/pull/7442)
+* [`assertions_on_constants`]: `cfg!(...)` is no longer considered to be a constant
+ [#7319](https://github.com/rust-lang/rust-clippy/pull/7319)
+
+### Suggestion Fixes/Improvements
+
+* [`needless_collect`]: Now show correct lint messages for shadowed values
+ [#7289](https://github.com/rust-lang/rust-clippy/pull/7289)
+* [`wrong_pub_self_convention`]: The deprecated message now suggest the correct configuration value
+ [#7382](https://github.com/rust-lang/rust-clippy/pull/7382)
+* [`semicolon_if_nothing_returned`]: Allow missing semicolon in blocks with only one expression
+ [#7326](https://github.com/rust-lang/rust-clippy/pull/7326)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#7470](https://github.com/rust-lang/rust-clippy/pull/7470)
+* [`redundant_pattern_matching`]
+ [#7471](https://github.com/rust-lang/rust-clippy/pull/7471)
+* [`modulo_one`]
+ [#7473](https://github.com/rust-lang/rust-clippy/pull/7473)
+* [`use_self`]
+ [#7428](https://github.com/rust-lang/rust-clippy/pull/7428)
+
+## Rust 1.54
+
+Released 2021-07-29
+
+[7c7683c...3ae8faf](https://github.com/rust-lang/rust-clippy/compare/7c7683c...3ae8faf)
+
+### New Lints
+
+- [`ref_binding_to_reference`]
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`needless_bitwise_bool`]
+ [#7133](https://github.com/rust-lang/rust-clippy/pull/7133)
+- [`unused_async`] [#7225](https://github.com/rust-lang/rust-clippy/pull/7225)
+- [`manual_str_repeat`]
+ [#7265](https://github.com/rust-lang/rust-clippy/pull/7265)
+- [`suspicious_splitn`]
+ [#7292](https://github.com/rust-lang/rust-clippy/pull/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](#1-54-enhancements))
+ [#7187](https://github.com/rust-lang/rust-clippy/pull/7187)
+- Move [`inconsistent_struct_constructor`] to `pedantic`
+ [#7193](https://github.com/rust-lang/rust-clippy/pull/7193)
+- Move [`needless_borrow`] to `style` (now warn-by-default)
+ [#7254](https://github.com/rust-lang/rust-clippy/pull/7254)
+- Move [`suspicious_operation_groupings`] to `nursery`
+ [#7266](https://github.com/rust-lang/rust-clippy/pull/7266)
+- Move [`semicolon_if_nothing_returned`] to `pedantic`
+ [#7268](https://github.com/rust-lang/rust-clippy/pull/7268)
+
+### Enhancements <a name="1-54-enhancements"></a>
+
+- [`while_let_on_iterator`]: Now also lints in nested loops
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`single_char_pattern`]: Now also lints on `strip_prefix` and `strip_suffix`
+ [#7156](https://github.com/rust-lang/rust-clippy/pull/7156)
+- [`needless_collect`]: Now also lints on assignments with type annotations
+ [#7163](https://github.com/rust-lang/rust-clippy/pull/7163)
+- [`if_then_some_else_none`]: Now works with the MSRV config
+ [#7177](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/7187)
+- [`needless_collect`]: Now lints on even more data structures
+ [#7188](https://github.com/rust-lang/rust-clippy/pull/7188)
+- [`missing_docs_in_private_items`]: No longer sees `#[<name> = "<value>"]` like
+ attributes as sufficient documentation
+ [#7281](https://github.com/rust-lang/rust-clippy/pull/7281)
+- [`needless_collect`], [`short_circuit_statement`], [`unnecessary_operation`]:
+ Now work as expected when used with `allow`
+ [#7282](https://github.com/rust-lang/rust-clippy/pull/7282)
+
+### False Positive Fixes
+
+- [`implicit_return`]: Now takes all diverging functions in account to avoid
+ false positives [#6951](https://github.com/rust-lang/rust-clippy/pull/6951)
+- [`while_let_on_iterator`]: No longer lints when the iterator is a struct field
+ and the struct is used in the loop
+ [#6966](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`multiple_inherent_impl`]: No longer lints with generic arguments
+ [#7089](https://github.com/rust-lang/rust-clippy/pull/7089)
+- [`comparison_chain`]: No longer lints in a `const` context
+ [#7118](https://github.com/rust-lang/rust-clippy/pull/7118)
+- [`while_immutable_condition`]: Fix false positive where mutation in the loop
+ variable wasn't picked up
+ [#7144](https://github.com/rust-lang/rust-clippy/pull/7144)
+- [`default_trait_access`]: No longer lints in macros
+ [#7150](https://github.com/rust-lang/rust-clippy/pull/7150)
+- [`needless_question_mark`]: No longer lints when the inner value is implicitly
+ dereferenced [#7165](https://github.com/rust-lang/rust-clippy/pull/7165)
+- [`unused_unit`]: No longer lints when multiple macro contexts are involved
+ [#7167](https://github.com/rust-lang/rust-clippy/pull/7167)
+- [`eval_order_dependence`]: Fix false positive in async context
+ [#7174](https://github.com/rust-lang/rust-clippy/pull/7174)
+- [`unnecessary_filter_map`]: No longer lints if the `filter_map` changes the
+ type [#7175](https://github.com/rust-lang/rust-clippy/pull/7175)
+- [`wrong_self_convention`]: No longer lints in trait implementations of
+ non-`Copy` types [#7182](https://github.com/rust-lang/rust-clippy/pull/7182)
+- [`suboptimal_flops`]: No longer lints on `powi(2)`
+ [#7201](https://github.com/rust-lang/rust-clippy/pull/7201)
+- [`wrong_self_convention`]: No longer lints if there is no implicit `self`
+ [#7215](https://github.com/rust-lang/rust-clippy/pull/7215)
+- [`option_if_let_else`]: No longer lints on `else if let` pattern
+ [#7216](https://github.com/rust-lang/rust-clippy/pull/7216)
+- [`use_self`], [`useless_conversion`]: Fix false positives when generic
+ arguments are involved
+ [#7223](https://github.com/rust-lang/rust-clippy/pull/7223)
+- [`manual_unwrap_or`]: Fix false positive with deref coercion
+ [#7233](https://github.com/rust-lang/rust-clippy/pull/7233)
+- [`similar_names`]: No longer lints on `wparam`/`lparam`
+ [#7255](https://github.com/rust-lang/rust-clippy/pull/7255)
+- [`redundant_closure`]: No longer lints on using the `vec![]` macro in a
+ closure [#7263](https://github.com/rust-lang/rust-clippy/pull/7263)
+
+### Suggestion Fixes/Improvements
+
+- [`implicit_return`]
+ [#6951](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6966)
+- [`match_single_binding`]: Improve suggestion when match scrutinee has side
+ effects [#7095](https://github.com/rust-lang/rust-clippy/pull/7095)
+- [`needless_borrow`]: Now suggests to also change usage sites as needed
+ [#7105](https://github.com/rust-lang/rust-clippy/pull/7105)
+- [`write_with_newline`]: Improve suggestion when only `\n` is written to the
+ buffer [#7183](https://github.com/rust-lang/rust-clippy/pull/7183)
+- [`from_iter_instead_of_collect`]: The suggestion is now auto applicable also
+ when a `<_ as Trait>::_` is involved
+ [#7264](https://github.com/rust-lang/rust-clippy/pull/7264)
+- [`not_unsafe_ptr_arg_deref`]: Improved error message
+ [#7294](https://github.com/rust-lang/rust-clippy/pull/7294)
+
+### ICE Fixes
+
+- Fix ICE when running Clippy on `libstd`
+ [#7140](https://github.com/rust-lang/rust-clippy/pull/7140)
+- [`implicit_return`]
+ [#7242](https://github.com/rust-lang/rust-clippy/pull/7242)
+
+## Rust 1.53
+
+Released 2021-06-17
+
+[6ed6f1e...7c7683c](https://github.com/rust-lang/rust-clippy/compare/6ed6f1e...7c7683c)
+
+### New Lints
+
+* [`option_filter_map`]
+ [#6342](https://github.com/rust-lang/rust-clippy/pull/6342)
+* [`branches_sharing_code`]
+ [#6463](https://github.com/rust-lang/rust-clippy/pull/6463)
+* [`needless_for_each`]
+ [#6706](https://github.com/rust-lang/rust-clippy/pull/6706)
+* [`if_then_some_else_none`]
+ [#6859](https://github.com/rust-lang/rust-clippy/pull/6859)
+* [`non_octal_unix_permissions`]
+ [#7001](https://github.com/rust-lang/rust-clippy/pull/7001)
+* [`unnecessary_self_imports`]
+ [#7072](https://github.com/rust-lang/rust-clippy/pull/7072)
+* [`bool_assert_comparison`]
+ [#7083](https://github.com/rust-lang/rust-clippy/pull/7083)
+* [`cloned_instead_of_copied`]
+ [#7098](https://github.com/rust-lang/rust-clippy/pull/7098)
+* [`flat_map_option`]
+ [#7101](https://github.com/rust-lang/rust-clippy/pull/7101)
+
+### Moves and Deprecations
+
+* Deprecate [`filter_map`] lint
+ [#7059](https://github.com/rust-lang/rust-clippy/pull/7059)
+* Move [`transmute_ptr_to_ptr`] to `pedantic`
+ [#7102](https://github.com/rust-lang/rust-clippy/pull/7102)
+
+### Enhancements
+
+* [`mem_replace_with_default`]: Also lint on common std constructors
+ [#6820](https://github.com/rust-lang/rust-clippy/pull/6820)
+* [`wrong_self_convention`]: Also lint on `to_*_mut` methods
+ [#6828](https://github.com/rust-lang/rust-clippy/pull/6828)
+* [`wildcard_enum_match_arm`], [`match_wildcard_for_single_variants`]:
+ [#6863](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6865)
+* [`or_fun_call`]: Also lint on `unsafe` blocks
+ [#6928](https://github.com/rust-lang/rust-clippy/pull/6928)
+* [`vec_box`], [`linkedlist`], [`option_option`]: Also lint in `const` and
+ `static` items [#6938](https://github.com/rust-lang/rust-clippy/pull/6938)
+* [`search_is_some`]: Also check for `is_none`
+ [#6942](https://github.com/rust-lang/rust-clippy/pull/6942)
+* [`string_lit_as_bytes`]: Also lint on `into_bytes`
+ [#6959](https://github.com/rust-lang/rust-clippy/pull/6959)
+* [`len_without_is_empty`]: Also lint if function signatures of `len` and
+ `is_empty` don't match
+ [#6980](https://github.com/rust-lang/rust-clippy/pull/6980)
+* [`redundant_pattern_matching`]: Also lint if the pattern is a `&` pattern
+ [#6991](https://github.com/rust-lang/rust-clippy/pull/6991)
+* [`clone_on_copy`]: Also lint on chained method calls taking `self` by value
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`missing_panics_doc`]: Also lint on `assert_eq!` and `assert_ne!`
+ [#7029](https://github.com/rust-lang/rust-clippy/pull/7029)
+* [`needless_return`]: Also lint in `async` functions
+ [#7067](https://github.com/rust-lang/rust-clippy/pull/7067)
+* [`unused_io_amount`]: Also lint on expressions like `_.read().ok()?`
+ [#7100](https://github.com/rust-lang/rust-clippy/pull/7100)
+* [`iter_cloned_collect`]: Also lint on large arrays, since const-generics are
+ now stable [#7138](https://github.com/rust-lang/rust-clippy/pull/7138)
+
+### False Positive Fixes
+
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6805](https://github.com/rust-lang/rust-clippy/pull/6805)
+* [`suspicious_map`]: No longer lints when side effects may occur inside the
+ `map` call [#6831](https://github.com/rust-lang/rust-clippy/pull/6831)
+* [`manual_map`], [`manual_unwrap_or`]: No longer lints in `const` functions
+ [#6917](https://github.com/rust-lang/rust-clippy/pull/6917)
+* [`wrong_self_convention`]: Now respects `Copy` types
+ [#6924](https://github.com/rust-lang/rust-clippy/pull/6924)
+* [`needless_question_mark`]: No longer lints if the `?` and the `Some(..)` come
+ from different macro contexts [#6935](https://github.com/rust-lang/rust-clippy/pull/6935)
+* [`map_entry`]: Better detect if the entry API can be used
+ [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`or_fun_call`]: No longer lints on some `len` function calls
+ [#6950](https://github.com/rust-lang/rust-clippy/pull/6950)
+* [`new_ret_no_self`]: No longer lints when `Self` is returned with different
+ generic arguments [#6952](https://github.com/rust-lang/rust-clippy/pull/6952)
+* [`upper_case_acronyms`]: No longer lints on public items
+ [#6981](https://github.com/rust-lang/rust-clippy/pull/6981)
+* [`explicit_into_iter_loop`]: Only lint when `into_iter` is an implementation
+ of `IntoIterator` [#6982](https://github.com/rust-lang/rust-clippy/pull/6982)
+* [`expl_impl_clone_on_copy`]: Take generic constraints into account before
+ suggesting to use `derive` instead
+ [#6993](https://github.com/rust-lang/rust-clippy/pull/6993)
+* [`missing_panics_doc`]: No longer lints when only debug-assertions are used
+ [#6996](https://github.com/rust-lang/rust-clippy/pull/6996)
+* [`clone_on_copy`]: Only lint when using the `Clone` trait
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`wrong_self_convention`]: No longer lints inside a trait implementation
+ [#7002](https://github.com/rust-lang/rust-clippy/pull/7002)
+* [`redundant_clone`]: No longer lints when the cloned value is modified while
+ the clone is in use
+ [#7011](https://github.com/rust-lang/rust-clippy/pull/7011)
+* [`same_item_push`]: No longer lints if the `Vec` is used in the loop body
+ [#7018](https://github.com/rust-lang/rust-clippy/pull/7018)
+* [`cargo_common_metadata`]: Remove author requirement
+ [#7026](https://github.com/rust-lang/rust-clippy/pull/7026)
+* [`panic_in_result_fn`]: No longer lints on `debug_assert` family
+ [#7060](https://github.com/rust-lang/rust-clippy/pull/7060)
+* [`panic`]: No longer wrongfully lints on `debug_assert` with message
+ [#7063](https://github.com/rust-lang/rust-clippy/pull/7063)
+* [`wrong_self_convention`]: No longer lints in trait implementations where no
+ `self` is involved [#7064](https://github.com/rust-lang/rust-clippy/pull/7064)
+* [`missing_const_for_fn`]: No longer lints when unstable `const` function is
+ involved [#7076](https://github.com/rust-lang/rust-clippy/pull/7076)
+* [`suspicious_else_formatting`]: Allow Allman style braces
+ [#7087](https://github.com/rust-lang/rust-clippy/pull/7087)
+* [`inconsistent_struct_constructor`]: No longer lints in macros
+ [#7097](https://github.com/rust-lang/rust-clippy/pull/7097)
+* [`single_component_path_imports`]: No longer lints on macro re-exports
+ [#7120](https://github.com/rust-lang/rust-clippy/pull/7120)
+
+### Suggestion Fixes/Improvements
+
+* [`redundant_pattern_matching`]: Add a note when applying this lint would
+ change the drop order
+ [#6568](https://github.com/rust-lang/rust-clippy/pull/6568)
+* [`write_literal`], [`print_literal`]: Add auto-applicable suggestion
+ [#6821](https://github.com/rust-lang/rust-clippy/pull/6821)
+* [`manual_map`]: Fix suggestion for complex `if let ... else` chains
+ [#6856](https://github.com/rust-lang/rust-clippy/pull/6856)
+* [`inconsistent_struct_constructor`]: Make lint description and message clearer
+ [#6892](https://github.com/rust-lang/rust-clippy/pull/6892)
+* [`map_entry`]: Now suggests `or_insert`, `insert_with` or `match _.entry(_)`
+ as appropriate [#6937](https://github.com/rust-lang/rust-clippy/pull/6937)
+* [`manual_flatten`]: Suggest to insert `copied` if necessary
+ [#6962](https://github.com/rust-lang/rust-clippy/pull/6962)
+* [`redundant_slicing`]: Fix suggestion when a re-borrow might be required or
+ when the value is from a macro call
+ [#6975](https://github.com/rust-lang/rust-clippy/pull/6975)
+* [`match_wildcard_for_single_variants`]: Fix suggestion for hidden variant
+ [#6988](https://github.com/rust-lang/rust-clippy/pull/6988)
+* [`clone_on_copy`]: Correct suggestion when the cloned value is a macro call
+ [#7000](https://github.com/rust-lang/rust-clippy/pull/7000)
+* [`manual_map`]: Fix suggestion at the end of an if chain
+ [#7004](https://github.com/rust-lang/rust-clippy/pull/7004)
+* Fix needless parenthesis output in multiple lint suggestions
+ [#7013](https://github.com/rust-lang/rust-clippy/pull/7013)
+* [`needless_collect`]: Better explanation in the lint message
+ [#7020](https://github.com/rust-lang/rust-clippy/pull/7020)
+* [`useless_vec`]: Now considers mutability
+ [#7036](https://github.com/rust-lang/rust-clippy/pull/7036)
+* [`useless_format`]: Wrap the content in braces if necessary
+ [#7092](https://github.com/rust-lang/rust-clippy/pull/7092)
+* [`single_match`]: Don't suggest an equality check for types which don't
+ implement `PartialEq`
+ [#7093](https://github.com/rust-lang/rust-clippy/pull/7093)
+* [`from_over_into`]: Mention type in help message
+ [#7099](https://github.com/rust-lang/rust-clippy/pull/7099)
+* [`manual_unwrap_or`]: Fix invalid code suggestion due to a macro call
+ [#7136](https://github.com/rust-lang/rust-clippy/pull/7136)
+
+### ICE Fixes
+
+* [`macro_use_imports`]
+ [#7022](https://github.com/rust-lang/rust-clippy/pull/7022)
+* [`missing_panics_doc`]
+ [#7034](https://github.com/rust-lang/rust-clippy/pull/7034)
+* [`tabs_in_doc_comments`]
+ [#7039](https://github.com/rust-lang/rust-clippy/pull/7039)
+* [`missing_const_for_fn`]
+ [#7128](https://github.com/rust-lang/rust-clippy/pull/7128)
+
+### Others
+
+* [Clippy's lint
+ list](https://rust-lang.github.io/rust-clippy/master/index.html) now supports
+ themes [#7030](https://github.com/rust-lang/rust-clippy/pull/7030)
+* Lints that were uplifted to `rustc` now mention the new `rustc` name in the
+ deprecation warning
+ [#7056](https://github.com/rust-lang/rust-clippy/pull/7056)
+
+## Rust 1.52
+
+Released 2021-05-06
+
+[3e41797...6ed6f1e](https://github.com/rust-lang/rust-clippy/compare/3e41797...6ed6f1e)
+
+### New Lints
+
+* [`from_str_radix_10`]
+ [#6717](https://github.com/rust-lang/rust-clippy/pull/6717)
+* [`implicit_clone`]
+ [#6730](https://github.com/rust-lang/rust-clippy/pull/6730)
+* [`semicolon_if_nothing_returned`]
+ [#6681](https://github.com/rust-lang/rust-clippy/pull/6681)
+* [`manual_flatten`]
+ [#6646](https://github.com/rust-lang/rust-clippy/pull/6646)
+* [`inconsistent_struct_constructor`]
+ [#6769](https://github.com/rust-lang/rust-clippy/pull/6769)
+* [`iter_count`]
+ [#6791](https://github.com/rust-lang/rust-clippy/pull/6791)
+* [`default_numeric_fallback`]
+ [#6662](https://github.com/rust-lang/rust-clippy/pull/6662)
+* [`bytes_nth`]
+ [#6695](https://github.com/rust-lang/rust-clippy/pull/6695)
+* [`filter_map_identity`]
+ [#6685](https://github.com/rust-lang/rust-clippy/pull/6685)
+* [`manual_map`]
+ [#6573](https://github.com/rust-lang/rust-clippy/pull/6573)
+
+### Moves and Deprecations
+
+* Moved [`upper_case_acronyms`] to `pedantic`
+ [#6775](https://github.com/rust-lang/rust-clippy/pull/6775)
+* Moved [`manual_map`] to `nursery`
+ [#6796](https://github.com/rust-lang/rust-clippy/pull/6796)
+* Moved [`unnecessary_wraps`] to `pedantic`
+ [#6765](https://github.com/rust-lang/rust-clippy/pull/6765)
+* Moved [`trivial_regex`] to `nursery`
+ [#6696](https://github.com/rust-lang/rust-clippy/pull/6696)
+* Moved [`naive_bytecount`] to `pedantic`
+ [#6825](https://github.com/rust-lang/rust-clippy/pull/6825)
+* Moved [`upper_case_acronyms`] to `style`
+ [#6788](https://github.com/rust-lang/rust-clippy/pull/6788)
+* Moved [`manual_map`] to `style`
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+
+### Enhancements
+
+* [`disallowed_methods`]: Now supports functions in addition to methods
+ [#6674](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6788)
+* [`collapsible_match`]: Now supports block comparison with different value names
+ [#6754](https://github.com/rust-lang/rust-clippy/pull/6754)
+* [`unnecessary_wraps`]: Will now suggest removing unnecessary wrapped return unit type, like `Option<()>`
+ [#6665](https://github.com/rust-lang/rust-clippy/pull/6665)
+* Improved value usage detection in closures
+ [#6698](https://github.com/rust-lang/rust-clippy/pull/6698)
+
+### False Positive Fixes
+
+* [`use_self`]: No longer lints in macros
+ [#6833](https://github.com/rust-lang/rust-clippy/pull/6833)
+* [`use_self`]: Fixed multiple false positives for: generics, associated types and derive implementations
+ [#6179](https://github.com/rust-lang/rust-clippy/pull/6179)
+* [`missing_inline_in_public_items`]: No longer lints for procedural macros
+ [#6814](https://github.com/rust-lang/rust-clippy/pull/6814)
+* [`inherent_to_string`]: No longer lints on functions with function generics
+ [#6771](https://github.com/rust-lang/rust-clippy/pull/6771)
+* [`doc_markdown`]: Add `OpenDNS` to the default configuration as an allowed identifier
+ [#6783](https://github.com/rust-lang/rust-clippy/pull/6783)
+* [`missing_panics_doc`]: No longer lints on [`unreachable!`](https://doc.rust-lang.org/std/macro.unreachable.html)
+ [#6700](https://github.com/rust-lang/rust-clippy/pull/6700)
+* [`collapsible_if`]: No longer lints on if statements with attributes
+ [#6701](https://github.com/rust-lang/rust-clippy/pull/6701)
+* [`match_same_arms`]: Only considers empty blocks as equal if the tokens contained are the same
+ [#6843](https://github.com/rust-lang/rust-clippy/pull/6843)
+* [`redundant_closure`]: Now ignores macros
+ [#6871](https://github.com/rust-lang/rust-clippy/pull/6871)
+* [`manual_map`]: Fixed false positives when control flow statements like `return`, `break` etc. are used
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* [`vec_init_then_push`]: Fixed false positives for loops and if statements
+ [#6697](https://github.com/rust-lang/rust-clippy/pull/6697)
+* [`len_without_is_empty`]: Will now consider multiple impl blocks and `#[allow]` on
+ the `len` method as well as the type definition.
+ [#6853](https://github.com/rust-lang/rust-clippy/pull/6853)
+* [`let_underscore_drop`]: Only lints on types which implement `Drop`
+ [#6682](https://github.com/rust-lang/rust-clippy/pull/6682)
+* [`unit_arg`]: No longer lints on unit arguments when they come from a path expression.
+ [#6601](https://github.com/rust-lang/rust-clippy/pull/6601)
+* [`cargo_common_metadata`]: No longer lints if
+ [`publish = false`](https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field)
+ is defined in the manifest
+ [#6650](https://github.com/rust-lang/rust-clippy/pull/6650)
+
+### Suggestion Fixes/Improvements
+
+* [`collapsible_match`]: Fixed lint message capitalization
+ [#6766](https://github.com/rust-lang/rust-clippy/pull/6766)
+* [`or_fun_call`]: Improved suggestions for `or_insert(vec![])`
+ [#6790](https://github.com/rust-lang/rust-clippy/pull/6790)
+* [`manual_map`]: No longer expands macros in the suggestions
+ [#6801](https://github.com/rust-lang/rust-clippy/pull/6801)
+* Aligned Clippy's lint messages with the rustc dev guide
+ [#6787](https://github.com/rust-lang/rust-clippy/pull/6787)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6866](https://github.com/rust-lang/rust-clippy/pull/6866)
+
+### Documentation Improvements
+
+* [`useless_format`]: Improved the documentation example
+ [#6854](https://github.com/rust-lang/rust-clippy/pull/6854)
+* Clippy's [`README.md`]: Includes a new subsection on running Clippy as a rustc wrapper
+ [#6782](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6687)
+* Cargo now re-runs Clippy if arguments after `--` provided to `cargo clippy` are changed.
+ [#6834](https://github.com/rust-lang/rust-clippy/pull/6834)
+* Extracted Clippy's `utils` module into the new `clippy_utils` crate
+ [#6756](https://github.com/rust-lang/rust-clippy/pull/6756)
+* Clippy lintcheck tool improvements
+ [#6800](https://github.com/rust-lang/rust-clippy/pull/6800)
+ [#6735](https://github.com/rust-lang/rust-clippy/pull/6735)
+ [#6764](https://github.com/rust-lang/rust-clippy/pull/6764)
+ [#6708](https://github.com/rust-lang/rust-clippy/pull/6708)
+ [#6780](https://github.com/rust-lang/rust-clippy/pull/6780)
+ [#6686](https://github.com/rust-lang/rust-clippy/pull/6686)
+
+## Rust 1.51
+
+Released 2021-03-25
+
+[4911ab1...3e41797](https://github.com/rust-lang/rust-clippy/compare/4911ab1...3e41797)
+
+### New Lints
+
+* [`upper_case_acronyms`]
+ [#6475](https://github.com/rust-lang/rust-clippy/pull/6475)
+* [`from_over_into`] [#6476](https://github.com/rust-lang/rust-clippy/pull/6476)
+* [`case_sensitive_file_extension_comparisons`]
+ [#6500](https://github.com/rust-lang/rust-clippy/pull/6500)
+* [`needless_question_mark`]
+ [#6507](https://github.com/rust-lang/rust-clippy/pull/6507)
+* [`missing_panics_doc`]
+ [#6523](https://github.com/rust-lang/rust-clippy/pull/6523)
+* [`redundant_slicing`]
+ [#6528](https://github.com/rust-lang/rust-clippy/pull/6528)
+* [`vec_init_then_push`]
+ [#6538](https://github.com/rust-lang/rust-clippy/pull/6538)
+* [`ptr_as_ptr`] [#6542](https://github.com/rust-lang/rust-clippy/pull/6542)
+* [`collapsible_else_if`] (split out from `collapsible_if`)
+ [#6544](https://github.com/rust-lang/rust-clippy/pull/6544)
+* [`inspect_for_each`] [#6577](https://github.com/rust-lang/rust-clippy/pull/6577)
+* [`manual_filter_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* [`exhaustive_enums`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+* [`exhaustive_structs`]
+ [#6617](https://github.com/rust-lang/rust-clippy/pull/6617)
+
+### Moves and Deprecations
+
+* Replace [`find_map`] with [`manual_find_map`]
+ [#6591](https://github.com/rust-lang/rust-clippy/pull/6591)
+* `unknown_clippy_lints` Now integrated in the `unknown_lints` rustc lint
+ [#6653](https://github.com/rust-lang/rust-clippy/pull/6653)
+
+### Enhancements
+
+* [`ptr_arg`] Now also suggests to use `&Path` instead of `&PathBuf`
+ [#6506](https://github.com/rust-lang/rust-clippy/pull/6506)
+* [`cast_ptr_alignment`] Also lint when the `pointer::cast` method is used
+ [#6557](https://github.com/rust-lang/rust-clippy/pull/6557)
+* [`collapsible_match`] Now also deals with `&` and `*` operators in the `match`
+ scrutinee [#6619](https://github.com/rust-lang/rust-clippy/pull/6619)
+
+### False Positive Fixes
+
+* [`similar_names`] Ignore underscore prefixed names
+ [#6403](https://github.com/rust-lang/rust-clippy/pull/6403)
+* [`print_literal`] and [`write_literal`] No longer lint numeric literals
+ [#6408](https://github.com/rust-lang/rust-clippy/pull/6408)
+* [`large_enum_variant`] No longer lints in external macros
+ [#6485](https://github.com/rust-lang/rust-clippy/pull/6485)
+* [`empty_enum`] Only lint if `never_type` feature is enabled
+ [#6513](https://github.com/rust-lang/rust-clippy/pull/6513)
+* [`field_reassign_with_default`] No longer lints in macros
+ [#6553](https://github.com/rust-lang/rust-clippy/pull/6553)
+* [`size_of_in_element_count`] No longer lints when dividing by element size
+ [#6578](https://github.com/rust-lang/rust-clippy/pull/6578)
+* [`needless_return`] No longer lints in macros
+ [#6586](https://github.com/rust-lang/rust-clippy/pull/6586)
+* [`match_overlapping_arm`] No longer lint when first arm is completely included
+ in second arm [#6603](https://github.com/rust-lang/rust-clippy/pull/6603)
+* [`doc_markdown`] Add `WebGL` to the default configuration as an allowed
+ identifier [#6605](https://github.com/rust-lang/rust-clippy/pull/6605)
+
+### Suggestion Fixes/Improvements
+
+* [`field_reassign_with_default`] Don't expand macro in lint suggestion
+ [#6531](https://github.com/rust-lang/rust-clippy/pull/6531)
+* [`match_like_matches_macro`] Strip references in suggestion
+ [#6532](https://github.com/rust-lang/rust-clippy/pull/6532)
+* [`single_match`] Suggest `if` over `if let` when possible
+ [#6574](https://github.com/rust-lang/rust-clippy/pull/6574)
- [`ref_in_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#ref_in_deref
++* `ref_in_deref` Use parentheses correctly in suggestion
+ [#6609](https://github.com/rust-lang/rust-clippy/pull/6609)
+* [`stable_sort_primitive`] Clarify error message
+ [#6611](https://github.com/rust-lang/rust-clippy/pull/6611)
+
+### ICE Fixes
+
+* [`zero_sized_map_values`]
+ [#6582](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6483)
+* Clean up `README.md` by removing outdated paragraph
+ [#6488](https://github.com/rust-lang/rust-clippy/pull/6488)
+* [`await_holding_refcell_ref`] and [`await_holding_lock`]
+ [#6585](https://github.com/rust-lang/rust-clippy/pull/6585)
+* [`as_conversions`] [#6608](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6462)
+* The Clippy version number now corresponds to the Rust version number
+ [#6526](https://github.com/rust-lang/rust-clippy/pull/6526)
+* Fix oversight which caused Clippy to lint deps in some environments, where
+ `CLIPPY_TESTS=true` was set somewhere
+ [#6575](https://github.com/rust-lang/rust-clippy/pull/6575)
+* Add `cargo dev-lintcheck` tool to the Clippy Dev Tool
+ [#6469](https://github.com/rust-lang/rust-clippy/pull/6469)
+
+[Roadmap]: https://github.com/rust-lang/rust-clippy/blob/master/doc/roadmap-2021.md
+[Roadmap project page]: https://github.com/rust-lang/rust-clippy/projects/3
+
+## Rust 1.50
+
+Released 2021-02-11
+
+[b20d4c1...4bd77a1](https://github.com/rust-lang/rust-clippy/compare/b20d4c1...4bd77a1)
+
+### New Lints
+
+* [`suspicious_operation_groupings`] [#6086](https://github.com/rust-lang/rust-clippy/pull/6086)
+* [`size_of_in_element_count`] [#6394](https://github.com/rust-lang/rust-clippy/pull/6394)
+* [`unnecessary_wraps`] [#6070](https://github.com/rust-lang/rust-clippy/pull/6070)
+* [`let_underscore_drop`] [#6305](https://github.com/rust-lang/rust-clippy/pull/6305)
+* [`collapsible_match`] [#6402](https://github.com/rust-lang/rust-clippy/pull/6402)
+* [`redundant_else`] [#6330](https://github.com/rust-lang/rust-clippy/pull/6330)
+* [`zero_sized_map_values`] [#6218](https://github.com/rust-lang/rust-clippy/pull/6218)
+* [`print_stderr`] [#6367](https://github.com/rust-lang/rust-clippy/pull/6367)
+* [`string_from_utf8_as_bytes`] [#6134](https://github.com/rust-lang/rust-clippy/pull/6134)
+
+### Moves and Deprecations
+
+* Previously deprecated [`str_to_string`] and [`string_to_string`] have been un-deprecated
+ as `restriction` lints [#6333](https://github.com/rust-lang/rust-clippy/pull/6333)
+* Deprecate `panic_params` lint. This is now available in rustc as `non_fmt_panics`
+ [#6351](https://github.com/rust-lang/rust-clippy/pull/6351)
+* Move [`map_err_ignore`] to `restriction`
+ [#6416](https://github.com/rust-lang/rust-clippy/pull/6416)
+* Move [`await_holding_refcell_ref`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+* Move [`await_holding_lock`] to `pedantic`
+ [#6354](https://github.com/rust-lang/rust-clippy/pull/6354)
+
+### Enhancements
+
+* Add the `unreadable-literal-lint-fractions` configuration to disable
+ the `unreadable_literal` lint for fractions
+ [#6421](https://github.com/rust-lang/rust-clippy/pull/6421)
+* [`clone_on_copy`]: Now shows the type in the lint message
+ [#6443](https://github.com/rust-lang/rust-clippy/pull/6443)
+* [`redundant_pattern_matching`]: Now also lints on `std::task::Poll`
+ [#6339](https://github.com/rust-lang/rust-clippy/pull/6339)
+* [`redundant_pattern_matching`]: Additionally also lints on `std::net::IpAddr`
+ [#6377](https://github.com/rust-lang/rust-clippy/pull/6377)
+* [`search_is_some`]: Now suggests `contains` instead of `find(foo).is_some()`
+ [#6119](https://github.com/rust-lang/rust-clippy/pull/6119)
+* [`clone_double_ref`]: Now prints the reference type in the lint message
+ [#6442](https://github.com/rust-lang/rust-clippy/pull/6442)
+* [`modulo_one`]: Now also lints on -1.
+ [#6360](https://github.com/rust-lang/rust-clippy/pull/6360)
+* [`empty_loop`]: Now lints no_std crates, too
+ [#6205](https://github.com/rust-lang/rust-clippy/pull/6205)
+* [`or_fun_call`]: Now also lints when indexing `HashMap` or `BTreeMap`
+ [#6267](https://github.com/rust-lang/rust-clippy/pull/6267)
+* [`wrong_self_convention`]: Now also lints in trait definitions
+ [#6316](https://github.com/rust-lang/rust-clippy/pull/6316)
+* [`needless_borrow`]: Print the type in the lint message
+ [#6449](https://github.com/rust-lang/rust-clippy/pull/6449)
+
+[msrv_readme]: https://github.com/rust-lang/rust-clippy#specifying-the-minimum-supported-rust-version
+
+### False Positive Fixes
+
+* [`manual_range_contains`]: No longer lints in `const fn`
+ [#6382](https://github.com/rust-lang/rust-clippy/pull/6382)
+* [`unnecessary_lazy_evaluations`]: No longer lints if closure argument is used
+ [#6370](https://github.com/rust-lang/rust-clippy/pull/6370)
+* [`match_single_binding`]: Now ignores cases with `#[cfg()]` macros
+ [#6435](https://github.com/rust-lang/rust-clippy/pull/6435)
+* [`match_like_matches_macro`]: No longer lints on arms with attributes
+ [#6290](https://github.com/rust-lang/rust-clippy/pull/6290)
+* [`map_clone`]: No longer lints with deref and clone
+ [#6269](https://github.com/rust-lang/rust-clippy/pull/6269)
+* [`map_clone`]: No longer lints in the case of &mut
+ [#6301](https://github.com/rust-lang/rust-clippy/pull/6301)
+* [`needless_update`]: Now ignores `non_exhaustive` structs
+ [#6464](https://github.com/rust-lang/rust-clippy/pull/6464)
+* [`needless_collect`]: No longer lints when a collect is needed multiple times
+ [#6313](https://github.com/rust-lang/rust-clippy/pull/6313)
+* [`unnecessary_cast`] No longer lints cfg-dependent types
+ [#6369](https://github.com/rust-lang/rust-clippy/pull/6369)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]:
+ Both now ignore enums with frozen variants
+ [#6110](https://github.com/rust-lang/rust-clippy/pull/6110)
+* [`field_reassign_with_default`] No longer lint for private fields
+ [#6537](https://github.com/rust-lang/rust-clippy/pull/6537)
+
+
+### Suggestion Fixes/Improvements
+
+* [`vec_box`]: Provide correct type scope suggestion
+ [#6271](https://github.com/rust-lang/rust-clippy/pull/6271)
+* [`manual_range_contains`]: Give correct suggestion when using floats
+ [#6320](https://github.com/rust-lang/rust-clippy/pull/6320)
+* [`unnecessary_lazy_evaluations`]: Don't always mark suggestion as MachineApplicable
+ [#6272](https://github.com/rust-lang/rust-clippy/pull/6272)
+* [`manual_async_fn`]: Improve suggestion formatting
+ [#6294](https://github.com/rust-lang/rust-clippy/pull/6294)
+* [`unnecessary_cast`]: Fix incorrectly formatted float literal suggestion
+ [#6362](https://github.com/rust-lang/rust-clippy/pull/6362)
+
+### ICE Fixes
+
+* Fix a crash in [`from_iter_instead_of_collect`]
+ [#6304](https://github.com/rust-lang/rust-clippy/pull/6304)
+* Fix a silent crash when parsing doc comments in [`needless_doctest_main`]
+ [#6458](https://github.com/rust-lang/rust-clippy/pull/6458)
+
+### Documentation Improvements
+
+* The lint website search has been improved ([#6477](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/6287)
+* Add known problems to [`comparison_chain`] documentation
+ [#6390](https://github.com/rust-lang/rust-clippy/pull/6390)
+* Fix example used in [`cargo_common_metadata`]
+ [#6293](https://github.com/rust-lang/rust-clippy/pull/6293)
+* Improve [`map_clone`] documentation
+ [#6340](https://github.com/rust-lang/rust-clippy/pull/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][msrv_readme]
+ [#6201](https://github.com/rust-lang/rust-clippy/pull/6201)
+* Add `--no-deps` option to avoid running on path dependencies in workspaces
+ [#6188](https://github.com/rust-lang/rust-clippy/pull/6188)
+
+## Rust 1.49
+
+Released 2020-12-31
+
+[e636b88...b20d4c1](https://github.com/rust-lang/rust-clippy/compare/e636b88...b20d4c1)
+
+### New Lints
+
+* [`field_reassign_with_default`] [#5911](https://github.com/rust-lang/rust-clippy/pull/5911)
+* [`await_holding_refcell_ref`] [#6029](https://github.com/rust-lang/rust-clippy/pull/6029)
+* [`disallowed_methods`] [#6081](https://github.com/rust-lang/rust-clippy/pull/6081)
+* [`inline_asm_x86_att_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`inline_asm_x86_intel_syntax`] [#6092](https://github.com/rust-lang/rust-clippy/pull/6092)
+* [`from_iter_instead_of_collect`] [#6101](https://github.com/rust-lang/rust-clippy/pull/6101)
+* [`mut_mutex_lock`] [#6103](https://github.com/rust-lang/rust-clippy/pull/6103)
+* [`single_element_loop`] [#6109](https://github.com/rust-lang/rust-clippy/pull/6109)
+* [`manual_unwrap_or`] [#6123](https://github.com/rust-lang/rust-clippy/pull/6123)
+* [`large_types_passed_by_value`] [#6135](https://github.com/rust-lang/rust-clippy/pull/6135)
+* [`result_unit_err`] [#6157](https://github.com/rust-lang/rust-clippy/pull/6157)
+* [`ref_option_ref`] [#6165](https://github.com/rust-lang/rust-clippy/pull/6165)
+* [`manual_range_contains`] [#6177](https://github.com/rust-lang/rust-clippy/pull/6177)
+* [`unusual_byte_groupings`] [#6183](https://github.com/rust-lang/rust-clippy/pull/6183)
+* [`comparison_to_empty`] [#6226](https://github.com/rust-lang/rust-clippy/pull/6226)
+* [`map_collect_result_unit`] [#6227](https://github.com/rust-lang/rust-clippy/pull/6227)
+* [`manual_ok_or`] [#6233](https://github.com/rust-lang/rust-clippy/pull/6233)
+
+### Moves and Deprecations
+
+* Rename `single_char_push_str` to [`single_char_add_str`]
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* Rename `zero_width_space` to [`invisible_characters`]
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* Deprecate `drop_bounds` (uplifted)
+ [#6111](https://github.com/rust-lang/rust-clippy/pull/6111)
+* Move [`string_lit_as_bytes`] to `nursery`
+ [#6117](https://github.com/rust-lang/rust-clippy/pull/6117)
+* Move [`rc_buffer`] to `restriction`
+ [#6128](https://github.com/rust-lang/rust-clippy/pull/6128)
+
+### Enhancements
+
+* [`manual_memcpy`]: Also lint when there are loop counters (and produce a
+ reliable suggestion)
+ [#5727](https://github.com/rust-lang/rust-clippy/pull/5727)
+* [`single_char_add_str`]: Also lint on `String::insert_str`
+ [#6037](https://github.com/rust-lang/rust-clippy/pull/6037)
+* [`invisible_characters`]: Also lint the characters `\u{AD}` and `\u{2060}`
+ [#6105](https://github.com/rust-lang/rust-clippy/pull/6105)
+* [`eq_op`]: Also lint on the `assert_*!` macro family
+ [#6167](https://github.com/rust-lang/rust-clippy/pull/6167)
+* [`items_after_statements`]: Also lint in local macro expansions
+ [#6176](https://github.com/rust-lang/rust-clippy/pull/6176)
+* [`unnecessary_cast`]: Also lint casts on integer and float literals
+ [#6187](https://github.com/rust-lang/rust-clippy/pull/6187)
+* [`manual_unwrap_or`]: Also lint `Result::unwrap_or`
+ [#6190](https://github.com/rust-lang/rust-clippy/pull/6190)
+* [`match_like_matches_macro`]: Also lint when `match` has more than two arms
+ [#6216](https://github.com/rust-lang/rust-clippy/pull/6216)
+* [`integer_arithmetic`]: Better handle `/` an `%` operators
+ [#6229](https://github.com/rust-lang/rust-clippy/pull/6229)
+
+### False Positive Fixes
+
+* [`needless_lifetimes`]: Bail out if the function has a `where` clause with the
+ lifetime [#5978](https://github.com/rust-lang/rust-clippy/pull/5978)
+* [`explicit_counter_loop`]: No longer lints, when loop counter is used after it
+ is incremented [#6076](https://github.com/rust-lang/rust-clippy/pull/6076)
+* [`or_fun_call`]: Revert changes addressing the handling of `const fn`
+ [#6077](https://github.com/rust-lang/rust-clippy/pull/6077)
+* [`needless_range_loop`]: No longer lints, when the iterable is used in the
+ range [#6102](https://github.com/rust-lang/rust-clippy/pull/6102)
+* [`inconsistent_digit_grouping`]: Fix bug when using floating point exponent
+ [#6104](https://github.com/rust-lang/rust-clippy/pull/6104)
+* [`mistyped_literal_suffixes`]: No longer lints on the fractional part of a
+ float (e.g. `713.32_64`)
+ [#6114](https://github.com/rust-lang/rust-clippy/pull/6114)
+* [`invalid_regex`]: No longer lint on unicode characters within `bytes::Regex`
+ [#6132](https://github.com/rust-lang/rust-clippy/pull/6132)
+* [`boxed_local`]: No longer lints on `extern fn` arguments
+ [#6133](https://github.com/rust-lang/rust-clippy/pull/6133)
+* [`needless_lifetimes`]: Fix regression, where lifetime is used in `where`
+ clause [#6198](https://github.com/rust-lang/rust-clippy/pull/6198)
+
+### Suggestion Fixes/Improvements
+
+* [`unnecessary_sort_by`]: Avoid dereferencing the suggested closure parameter
+ [#6078](https://github.com/rust-lang/rust-clippy/pull/6078)
+* [`needless_arbitrary_self_type`]: Correctly handle expanded code
+ [#6093](https://github.com/rust-lang/rust-clippy/pull/6093)
+* [`useless_format`]: Preserve raw strings in suggestion
+ [#6151](https://github.com/rust-lang/rust-clippy/pull/6151)
+* [`empty_loop`]: Suggest alternatives
+ [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`borrowed_box`]: Correctly add parentheses in suggestion
+ [#6200](https://github.com/rust-lang/rust-clippy/pull/6200)
+* [`unused_unit`]: Improve suggestion formatting
+ [#6247](https://github.com/rust-lang/rust-clippy/pull/6247)
+
+### Documentation Improvements
+
+* Some doc improvements:
+ * [`rc_buffer`] [#6090](https://github.com/rust-lang/rust-clippy/pull/6090)
+ * [`empty_loop`] [#6162](https://github.com/rust-lang/rust-clippy/pull/6162)
+* [`doc_markdown`]: Document problematic link text style
+ [#6107](https://github.com/rust-lang/rust-clippy/pull/6107)
+
+## Rust 1.48
+
+Released 2020-11-19
+
+[09bd400...e636b88](https://github.com/rust-lang/rust-clippy/compare/09bd400...e636b88)
+
+### New lints
+
+* [`self_assignment`] [#5894](https://github.com/rust-lang/rust-clippy/pull/5894)
+* [`unnecessary_lazy_evaluations`] [#5720](https://github.com/rust-lang/rust-clippy/pull/5720)
+* [`manual_strip`] [#6038](https://github.com/rust-lang/rust-clippy/pull/6038)
+* [`map_err_ignore`] [#5998](https://github.com/rust-lang/rust-clippy/pull/5998)
+* [`rc_buffer`] [#6044](https://github.com/rust-lang/rust-clippy/pull/6044)
+* [`to_string_in_display`] [#5831](https://github.com/rust-lang/rust-clippy/pull/5831)
+* `single_char_push_str` [#5881](https://github.com/rust-lang/rust-clippy/pull/5881)
+
+### Moves and Deprecations
+
+* Downgrade [`verbose_bit_mask`] to pedantic
+ [#6036](https://github.com/rust-lang/rust-clippy/pull/6036)
+
+### Enhancements
+
+* Extend [`precedence`] to handle chains of methods combined with unary negation
+ [#5928](https://github.com/rust-lang/rust-clippy/pull/5928)
+* [`useless_vec`]: add a configuration value for the maximum allowed size on the stack
+ [#5907](https://github.com/rust-lang/rust-clippy/pull/5907)
+* [`suspicious_arithmetic_impl`]: extend to implementations of `BitAnd`, `BitOr`, `BitXor`, `Rem`, `Shl`, and `Shr`
+ [#5884](https://github.com/rust-lang/rust-clippy/pull/5884)
+* `invalid_atomic_ordering`: detect misuse of `compare_exchange`, `compare_exchange_weak`, and `fetch_update`
+ [#6025](https://github.com/rust-lang/rust-clippy/pull/6025)
+* Avoid [`redundant_pattern_matching`] triggering in macros
+ [#6069](https://github.com/rust-lang/rust-clippy/pull/6069)
+* [`option_if_let_else`]: distinguish pure from impure `else` expressions
+ [#5937](https://github.com/rust-lang/rust-clippy/pull/5937)
+* [`needless_doctest_main`]: parse doctests instead of using textual search
+ [#5912](https://github.com/rust-lang/rust-clippy/pull/5912)
+* [`wildcard_imports`]: allow `prelude` to appear in any segment of an import
+ [#5929](https://github.com/rust-lang/rust-clippy/pull/5929)
+* Re-enable [`len_zero`] for ranges now that `range_is_empty` is stable
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+* [`option_as_ref_deref`]: catch fully-qualified calls to `Deref::deref` and `DerefMut::deref_mut`
+ [#5933](https://github.com/rust-lang/rust-clippy/pull/5933)
+
+### False Positive Fixes
+
+* [`useless_attribute`]: permit allowing [`wildcard_imports`] and [`enum_glob_use`]
+ [#5994](https://github.com/rust-lang/rust-clippy/pull/5994)
+* [`transmute_ptr_to_ptr`]: avoid suggesting dereferencing raw pointers in const contexts
+ [#5999](https://github.com/rust-lang/rust-clippy/pull/5999)
+* [`redundant_closure_call`]: take into account usages of the closure in nested functions and closures
+ [#5920](https://github.com/rust-lang/rust-clippy/pull/5920)
+* Fix false positive in [`borrow_interior_mutable_const`] when referencing a field behind a pointer
+ [#5949](https://github.com/rust-lang/rust-clippy/pull/5949)
+* [`doc_markdown`]: allow using "GraphQL" without backticks
+ [#5996](https://github.com/rust-lang/rust-clippy/pull/5996)
+* [`to_string_in_display`]: avoid linting when calling `to_string()` on anything that is not `self`
+ [#5971](https://github.com/rust-lang/rust-clippy/pull/5971)
+* [`indexing_slicing`] and [`out_of_bounds_indexing`] treat references to arrays as arrays
+ [#6034](https://github.com/rust-lang/rust-clippy/pull/6034)
+* [`should_implement_trait`]: ignore methods with lifetime parameters
+ [#5725](https://github.com/rust-lang/rust-clippy/pull/5725)
+* [`needless_return`]: avoid linting if a temporary borrows a local variable
+ [#5903](https://github.com/rust-lang/rust-clippy/pull/5903)
+* Restrict [`unnecessary_sort_by`] to non-reference, Copy types
+ [#6006](https://github.com/rust-lang/rust-clippy/pull/6006)
+* Avoid suggesting `from_bits`/`to_bits` in const contexts in [`transmute_int_to_float`]
+ [#5919](https://github.com/rust-lang/rust-clippy/pull/5919)
+* [`declare_interior_mutable_const`] and [`borrow_interior_mutable_const`]: improve detection of interior mutable types
+ [#6046](https://github.com/rust-lang/rust-clippy/pull/6046)
+
+### Suggestion Fixes/Improvements
+
+* [`let_and_return`]: add a cast to the suggestion when the return expression has adjustments
+ [#5946](https://github.com/rust-lang/rust-clippy/pull/5946)
+* [`useless_conversion`]: show the type in the error message
+ [#6035](https://github.com/rust-lang/rust-clippy/pull/6035)
+* [`unnecessary_mut_passed`]: discriminate between functions and methods in the error message
+ [#5892](https://github.com/rust-lang/rust-clippy/pull/5892)
+* [`float_cmp`] and [`float_cmp_const`]: change wording to make margin of error less ambiguous
+ [#6043](https://github.com/rust-lang/rust-clippy/pull/6043)
+* [`default_trait_access`]: do not use unnecessary type parameters in the suggestion
+ [#5993](https://github.com/rust-lang/rust-clippy/pull/5993)
+* [`collapsible_if`]: don't use expanded code in the suggestion
+ [#5992](https://github.com/rust-lang/rust-clippy/pull/5992)
+* Do not suggest empty format strings in [`print_with_newline`] and [`write_with_newline`]
+ [#6042](https://github.com/rust-lang/rust-clippy/pull/6042)
+* [`unit_arg`]: improve the readability of the suggestion
+ [#5931](https://github.com/rust-lang/rust-clippy/pull/5931)
+* [`stable_sort_primitive`]: print the type that is being sorted in the lint message
+ [#5935](https://github.com/rust-lang/rust-clippy/pull/5935)
+* Show line count and max lines in [`too_many_lines`] lint message
+ [#6009](https://github.com/rust-lang/rust-clippy/pull/6009)
+* Keep parentheses in the suggestion of [`useless_conversion`] where applicable
+ [#5900](https://github.com/rust-lang/rust-clippy/pull/5900)
+* [`option_map_unit_fn`] and [`result_map_unit_fn`]: print the unit type `()` explicitly
+ [#6024](https://github.com/rust-lang/rust-clippy/pull/6024)
+* [`redundant_allocation`]: suggest replacing `Rc<Box<T>>` with `Rc<T>`
+ [#5899](https://github.com/rust-lang/rust-clippy/pull/5899)
+* Make lint messages adhere to rustc dev guide conventions
+ [#5893](https://github.com/rust-lang/rust-clippy/pull/5893)
+
+### ICE Fixes
+
+* Fix ICE in [`repeat_once`]
+ [#5948](https://github.com/rust-lang/rust-clippy/pull/5948)
+
+### Documentation Improvements
+
+* [`mutable_key_type`]: explain potential for false positives when the interior mutable type is not accessed in the `Hash` implementation
+ [#6019](https://github.com/rust-lang/rust-clippy/pull/6019)
+* [`unnecessary_mut_passed`]: fix typo
+ [#5913](https://github.com/rust-lang/rust-clippy/pull/5913)
+* Add example of false positive to [`ptr_arg`] docs.
+ [#5885](https://github.com/rust-lang/rust-clippy/pull/5885)
+* [`box_vec`](https://rust-lang.github.io/rust-clippy/master/index.html#box_collection), [`vec_box`] and [`borrowed_box`]: add link to the documentation of `Box`
+ [#6023](https://github.com/rust-lang/rust-clippy/pull/6023)
+
+## Rust 1.47
+
+Released 2020-10-08
+
+[c2c07fa...09bd400](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...09bd400)
+
+### New lints
+
+* [`derive_ord_xor_partial_ord`] [#5848](https://github.com/rust-lang/rust-clippy/pull/5848)
+* [`trait_duplication_in_bounds`] [#5852](https://github.com/rust-lang/rust-clippy/pull/5852)
+* [`map_identity`] [#5694](https://github.com/rust-lang/rust-clippy/pull/5694)
+* [`unit_return_expecting_ord`] [#5737](https://github.com/rust-lang/rust-clippy/pull/5737)
+* [`pattern_type_mismatch`] [#4841](https://github.com/rust-lang/rust-clippy/pull/4841)
+* [`repeat_once`] [#5773](https://github.com/rust-lang/rust-clippy/pull/5773)
+* [`same_item_push`] [#5825](https://github.com/rust-lang/rust-clippy/pull/5825)
+* [`needless_arbitrary_self_type`] [#5869](https://github.com/rust-lang/rust-clippy/pull/5869)
+* [`match_like_matches_macro`] [#5769](https://github.com/rust-lang/rust-clippy/pull/5769)
+* [`stable_sort_primitive`] [#5809](https://github.com/rust-lang/rust-clippy/pull/5809)
+* [`blanket_clippy_restriction_lints`] [#5750](https://github.com/rust-lang/rust-clippy/pull/5750)
+* [`option_if_let_else`] [#5301](https://github.com/rust-lang/rust-clippy/pull/5301)
+
+### Moves and Deprecations
+
+* Deprecate [`regex_macro`] lint
+ [#5760](https://github.com/rust-lang/rust-clippy/pull/5760)
+* Move [`range_minus_one`] to `pedantic`
+ [#5752](https://github.com/rust-lang/rust-clippy/pull/5752)
+
+### Enhancements
+
+* Improve [`needless_collect`] by catching `collect` calls followed by `iter` or `into_iter` calls
+ [#5837](https://github.com/rust-lang/rust-clippy/pull/5837)
+* [`panic`], [`todo`], [`unimplemented`] and [`unreachable`] now detect calls with formatting
+ [#5811](https://github.com/rust-lang/rust-clippy/pull/5811)
+* Detect more cases of [`suboptimal_flops`] and [`imprecise_flops`]
+ [#5443](https://github.com/rust-lang/rust-clippy/pull/5443)
+* Handle asymmetrical implementations of `PartialEq` in [`cmp_owned`]
+ [#5701](https://github.com/rust-lang/rust-clippy/pull/5701)
+* Make it possible to allow [`unsafe_derive_deserialize`]
+ [#5870](https://github.com/rust-lang/rust-clippy/pull/5870)
+* Catch `ord.min(a).max(b)` where a < b in [`min_max`]
+ [#5871](https://github.com/rust-lang/rust-clippy/pull/5871)
+* Make [`clone_on_copy`] suggestion machine applicable
+ [#5745](https://github.com/rust-lang/rust-clippy/pull/5745)
+* Enable [`len_zero`] on ranges now that `is_empty` is stable on them
+ [#5961](https://github.com/rust-lang/rust-clippy/pull/5961)
+
+### False Positive Fixes
+
+* Avoid triggering [`or_fun_call`] with const fns that take no arguments
+ [#5889](https://github.com/rust-lang/rust-clippy/pull/5889)
+* Fix [`redundant_closure_call`] false positive for closures that have multiple calls
+ [#5800](https://github.com/rust-lang/rust-clippy/pull/5800)
+* Don't lint cases involving `ManuallyDrop` in [`redundant_clone`]
+ [#5824](https://github.com/rust-lang/rust-clippy/pull/5824)
+* Treat a single expression the same as a single statement in the 2nd arm of a match in [`single_match_else`]
+ [#5771](https://github.com/rust-lang/rust-clippy/pull/5771)
+* Don't trigger [`unnested_or_patterns`] if the feature `or_patterns` is not enabled
+ [#5758](https://github.com/rust-lang/rust-clippy/pull/5758)
+* Avoid linting if key borrows in [`unnecessary_sort_by`]
+ [#5756](https://github.com/rust-lang/rust-clippy/pull/5756)
+* Consider `Try` impl for `Poll` when generating suggestions in [`try_err`]
+ [#5857](https://github.com/rust-lang/rust-clippy/pull/5857)
+* Take input lifetimes into account in `manual_async_fn`
+ [#5859](https://github.com/rust-lang/rust-clippy/pull/5859)
+* Fix multiple false positives in [`type_repetition_in_bounds`] and add a configuration option
+ [#5761](https://github.com/rust-lang/rust-clippy/pull/5761)
+* Limit the [`suspicious_arithmetic_impl`] lint to one binary operation
+ [#5820](https://github.com/rust-lang/rust-clippy/pull/5820)
+
+### Suggestion Fixes/Improvements
+
+* Improve readability of [`shadow_unrelated`] suggestion by truncating the RHS snippet
+ [#5788](https://github.com/rust-lang/rust-clippy/pull/5788)
+* Suggest `filter_map` instead of `flat_map` when mapping to `Option` in [`map_flatten`]
+ [#5846](https://github.com/rust-lang/rust-clippy/pull/5846)
+* Ensure suggestion is shown correctly for long method call chains in [`iter_nth_zero`]
+ [#5793](https://github.com/rust-lang/rust-clippy/pull/5793)
+* Drop borrow operator in suggestions of [`redundant_pattern_matching`]
+ [#5815](https://github.com/rust-lang/rust-clippy/pull/5815)
+* Add suggestion for [`iter_skip_next`]
+ [#5843](https://github.com/rust-lang/rust-clippy/pull/5843)
+* Improve [`collapsible_if`] fix suggestion
+ [#5732](https://github.com/rust-lang/rust-clippy/pull/5732)
+
+### ICE Fixes
+
+* Fix ICE caused by [`needless_collect`]
+ [#5877](https://github.com/rust-lang/rust-clippy/pull/5877)
+* Fix ICE caused by [`unnested_or_patterns`]
+ [#5784](https://github.com/rust-lang/rust-clippy/pull/5784)
+
+### Documentation Improvements
+
+* Fix grammar of [`await_holding_lock`] documentation
+ [#5748](https://github.com/rust-lang/rust-clippy/pull/5748)
+
+### Others
+
+* Make lints adhere to the rustc dev guide
+ [#5888](https://github.com/rust-lang/rust-clippy/pull/5888)
+
+## Rust 1.46
+
+Released 2020-08-27
+
+[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...c2c07fa)
+
+### New lints
+
+* [`unnested_or_patterns`] [#5378](https://github.com/rust-lang/rust-clippy/pull/5378)
+* [`iter_next_slice`] [#5597](https://github.com/rust-lang/rust-clippy/pull/5597)
+* [`unnecessary_sort_by`] [#5623](https://github.com/rust-lang/rust-clippy/pull/5623)
+* [`vec_resize_to_zero`] [#5637](https://github.com/rust-lang/rust-clippy/pull/5637)
+
+### Moves and Deprecations
+
+* Move [`cast_ptr_alignment`] to pedantic [#5667](https://github.com/rust-lang/rust-clippy/pull/5667)
+
+### Enhancements
+
+* Improve [`mem_replace_with_uninit`] lint [#5695](https://github.com/rust-lang/rust-clippy/pull/5695)
+
+### False Positive Fixes
+
+* [`len_zero`]: Avoid linting ranges when the `range_is_empty` feature is not enabled
+ [#5656](https://github.com/rust-lang/rust-clippy/pull/5656)
+* [`let_and_return`]: Don't lint if a temporary borrow is involved
+ [#5680](https://github.com/rust-lang/rust-clippy/pull/5680)
+* [`reversed_empty_ranges`]: Avoid linting `N..N` in for loop arguments in
+ [#5692](https://github.com/rust-lang/rust-clippy/pull/5692)
+* [`if_same_then_else`]: Don't assume multiplication is always commutative
+ [#5702](https://github.com/rust-lang/rust-clippy/pull/5702)
+* [`blacklisted_name`]: Remove `bar` from the default configuration
+ [#5712](https://github.com/rust-lang/rust-clippy/pull/5712)
+* [`redundant_pattern_matching`]: Avoid suggesting non-`const fn` calls in const contexts
+ [#5724](https://github.com/rust-lang/rust-clippy/pull/5724)
+
+### Suggestion Fixes/Improvements
+
+* Fix suggestion of [`unit_arg`] lint, so that it suggest semantic equivalent code
+ [#4455](https://github.com/rust-lang/rust-clippy/pull/4455)
+* Add auto applicable suggestion to [`macro_use_imports`]
+ [#5279](https://github.com/rust-lang/rust-clippy/pull/5279)
+
+### ICE Fixes
+
+* Fix ICE in the `consts` module of Clippy [#5709](https://github.com/rust-lang/rust-clippy/pull/5709)
+
+### Documentation Improvements
+
+* Improve code examples across multiple lints [#5664](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/pull/5178)
+* New issue templates now make it easier to complain if Clippy is too annoying
+ or not annoying enough! [#5735](https://github.com/rust-lang/rust-clippy/pull/5735)
+
+## Rust 1.45
+
+Released 2020-07-16
+
+[891e1a8...7ea7cd1](https://github.com/rust-lang/rust-clippy/compare/891e1a8...7ea7cd1)
+
+### New lints
+
+* [`match_wildcard_for_single_variants`] [#5582](https://github.com/rust-lang/rust-clippy/pull/5582)
+* [`unsafe_derive_deserialize`] [#5493](https://github.com/rust-lang/rust-clippy/pull/5493)
+* [`if_let_mutex`] [#5332](https://github.com/rust-lang/rust-clippy/pull/5332)
+* [`mismatched_target_os`] [#5506](https://github.com/rust-lang/rust-clippy/pull/5506)
+* [`await_holding_lock`] [#5439](https://github.com/rust-lang/rust-clippy/pull/5439)
+* [`match_on_vec_items`] [#5522](https://github.com/rust-lang/rust-clippy/pull/5522)
+* [`manual_async_fn`] [#5576](https://github.com/rust-lang/rust-clippy/pull/5576)
+* [`reversed_empty_ranges`] [#5583](https://github.com/rust-lang/rust-clippy/pull/5583)
+* [`manual_non_exhaustive`] [#5550](https://github.com/rust-lang/rust-clippy/pull/5550)
+
+### Moves and Deprecations
+
+* Downgrade [`match_bool`] to pedantic [#5408](https://github.com/rust-lang/rust-clippy/pull/5408)
+* Downgrade [`match_wild_err_arm`] to pedantic and update help messages. [#5622](https://github.com/rust-lang/rust-clippy/pull/5622)
+* Downgrade [`useless_let_if_seq`] to nursery. [#5599](https://github.com/rust-lang/rust-clippy/pull/5599)
+* Generalize `option_and_then_some` and rename to [`bind_instead_of_map`]. [#5529](https://github.com/rust-lang/rust-clippy/pull/5529)
+* Rename `identity_conversion` to [`useless_conversion`]. [#5568](https://github.com/rust-lang/rust-clippy/pull/5568)
+* Merge `block_in_if_condition_expr` and `block_in_if_condition_stmt` into [`blocks_in_if_conditions`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_map_unwrap_or`, `option_map_unwrap_or_else` and `result_map_unwrap_or_else` into [`map_unwrap_or`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_unwrap_used` and `result_unwrap_used` into [`unwrap_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `option_expect_used` and `result_expect_used` into [`expect_used`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+* Merge `for_loop_over_option` and `for_loop_over_result` into [`for_loops_over_fallibles`].
+[#5563](https://github.com/rust-lang/rust-clippy/pull/5563)
+
+### Enhancements
+
+* Avoid running cargo lints when not enabled to improve performance. [#5505](https://github.com/rust-lang/rust-clippy/pull/5505)
+* Extend [`useless_conversion`] with `TryFrom` and `TryInto`. [#5631](https://github.com/rust-lang/rust-clippy/pull/5631)
+* Lint also in type parameters and where clauses in [`unused_unit`]. [#5592](https://github.com/rust-lang/rust-clippy/pull/5592)
+* Do not suggest deriving `Default` in [`new_without_default`]. [#5616](https://github.com/rust-lang/rust-clippy/pull/5616)
+
+### False Positive Fixes
+
+* [`while_let_on_iterator`] [#5525](https://github.com/rust-lang/rust-clippy/pull/5525)
+* [`empty_line_after_outer_attr`] [#5609](https://github.com/rust-lang/rust-clippy/pull/5609)
+* [`unnecessary_unwrap`] [#5558](https://github.com/rust-lang/rust-clippy/pull/5558)
+* [`comparison_chain`] [#5596](https://github.com/rust-lang/rust-clippy/pull/5596)
+* Don't trigger [`used_underscore_binding`] in await desugaring. [#5535](https://github.com/rust-lang/rust-clippy/pull/5535)
+* Don't trigger [`borrowed_box`] on mutable references. [#5491](https://github.com/rust-lang/rust-clippy/pull/5491)
+* Allow `1 << 0` in [`identity_op`]. [#5602](https://github.com/rust-lang/rust-clippy/pull/5602)
+* Allow `use super::*;` glob imports in [`wildcard_imports`]. [#5564](https://github.com/rust-lang/rust-clippy/pull/5564)
+* Whitelist more words in [`doc_markdown`]. [#5611](https://github.com/rust-lang/rust-clippy/pull/5611)
+* Skip dev and build deps in [`multiple_crate_versions`]. [#5636](https://github.com/rust-lang/rust-clippy/pull/5636)
+* Honor `allow` attribute on arguments in [`ptr_arg`]. [#5647](https://github.com/rust-lang/rust-clippy/pull/5647)
+* Honor lint level attributes for [`redundant_field_names`], [`just_underscores_and_digits`], [`many_single_char_names`]
+and [`similar_names`]. [#5651](https://github.com/rust-lang/rust-clippy/pull/5651)
+* Ignore calls to `len` in [`or_fun_call`]. [#4429](https://github.com/rust-lang/rust-clippy/pull/4429)
+
+### Suggestion Improvements
+
+* Simplify suggestions in [`manual_memcpy`]. [#5536](https://github.com/rust-lang/rust-clippy/pull/5536)
+* Fix suggestion in [`redundant_pattern_matching`] for macros. [#5511](https://github.com/rust-lang/rust-clippy/pull/5511)
+* Avoid suggesting `copied()` for mutable references in [`map_clone`]. [#5530](https://github.com/rust-lang/rust-clippy/pull/5530)
+* Improve help message for [`clone_double_ref`]. [#5547](https://github.com/rust-lang/rust-clippy/pull/5547)
+
+### ICE Fixes
+
+* Fix ICE caused in unwrap module. [#5590](https://github.com/rust-lang/rust-clippy/pull/5590)
+* Fix ICE on rustc test issue-69020-assoc-const-arith-overflow.rs [#5499](https://github.com/rust-lang/rust-clippy/pull/5499)
+
+### Documentation
+
+* Clarify the documentation of [`unnecessary_mut_passed`]. [#5639](https://github.com/rust-lang/rust-clippy/pull/5639)
+* Extend example for [`unneeded_field_pattern`]. [#5541](https://github.com/rust-lang/rust-clippy/pull/5541)
+
+## Rust 1.44
+
+Released 2020-06-04
+
+[204bb9b...891e1a8](https://github.com/rust-lang/rust-clippy/compare/204bb9b...891e1a8)
+
+### New lints
+
+* [`explicit_deref_methods`] [#5226](https://github.com/rust-lang/rust-clippy/pull/5226)
+* [`implicit_saturating_sub`] [#5427](https://github.com/rust-lang/rust-clippy/pull/5427)
+* [`macro_use_imports`] [#5230](https://github.com/rust-lang/rust-clippy/pull/5230)
+* [`verbose_file_reads`] [#5272](https://github.com/rust-lang/rust-clippy/pull/5272)
+* [`future_not_send`] [#5423](https://github.com/rust-lang/rust-clippy/pull/5423)
+* [`redundant_pub_crate`] [#5319](https://github.com/rust-lang/rust-clippy/pull/5319)
+* [`large_const_arrays`] [#5248](https://github.com/rust-lang/rust-clippy/pull/5248)
+* [`result_map_or_into_option`] [#5415](https://github.com/rust-lang/rust-clippy/pull/5415)
+* [`redundant_allocation`] [#5349](https://github.com/rust-lang/rust-clippy/pull/5349)
+* [`fn_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+* [`vtable_address_comparisons`] [#5294](https://github.com/rust-lang/rust-clippy/pull/5294)
+
+
+### Moves and Deprecations
+
+* Deprecate [`replace_consts`] lint [#5380](https://github.com/rust-lang/rust-clippy/pull/5380)
+* Move [`cognitive_complexity`] to nursery [#5428](https://github.com/rust-lang/rust-clippy/pull/5428)
+* Move [`useless_transmute`] to nursery [#5364](https://github.com/rust-lang/rust-clippy/pull/5364)
+* Downgrade [`inefficient_to_string`] to pedantic [#5412](https://github.com/rust-lang/rust-clippy/pull/5412)
+* Downgrade [`option_option`] to pedantic [#5401](https://github.com/rust-lang/rust-clippy/pull/5401)
+* Downgrade [`unreadable_literal`] to pedantic [#5419](https://github.com/rust-lang/rust-clippy/pull/5419)
+* Downgrade [`let_unit_value`] to pedantic [#5409](https://github.com/rust-lang/rust-clippy/pull/5409)
+* Downgrade [`trivially_copy_pass_by_ref`] to pedantic [#5410](https://github.com/rust-lang/rust-clippy/pull/5410)
+* Downgrade [`implicit_hasher`] to pedantic [#5411](https://github.com/rust-lang/rust-clippy/pull/5411)
+
+### Enhancements
+
+* On _nightly_ you can now use `cargo clippy --fix -Z unstable-options` to
+ auto-fix lints that support this [#5363](https://github.com/rust-lang/rust-clippy/pull/5363)
+* Make [`redundant_clone`] also trigger on cases where the cloned value is not
+ consumed. [#5304](https://github.com/rust-lang/rust-clippy/pull/5304)
+* Expand [`integer_arithmetic`] to also disallow bit-shifting [#5430](https://github.com/rust-lang/rust-clippy/pull/5430)
+* [`option_as_ref_deref`] now detects more deref cases [#5425](https://github.com/rust-lang/rust-clippy/pull/5425)
+* [`large_enum_variant`] now report the sizes of the largest and second-largest variants [#5466](https://github.com/rust-lang/rust-clippy/pull/5466)
+* [`bool_comparison`] now also checks for inequality comparisons that can be
+ written more concisely [#5365](https://github.com/rust-lang/rust-clippy/pull/5365)
+* Expand [`clone_on_copy`] to work in method call arguments as well [#5441](https://github.com/rust-lang/rust-clippy/pull/5441)
+* [`redundant_pattern_matching`] now also handles `while let` [#5483](https://github.com/rust-lang/rust-clippy/pull/5483)
+* [`integer_arithmetic`] now also lints references of integers [#5329](https://github.com/rust-lang/rust-clippy/pull/5329)
+* Expand [`float_cmp_const`] to also work on arrays [#5345](https://github.com/rust-lang/rust-clippy/pull/5345)
+* Trigger [`map_flatten`] when map is called on an `Option` [#5473](https://github.com/rust-lang/rust-clippy/pull/5473)
+
+### False Positive Fixes
+
+* [`many_single_char_names`] [#5468](https://github.com/rust-lang/rust-clippy/pull/5468)
+* [`should_implement_trait`] [#5437](https://github.com/rust-lang/rust-clippy/pull/5437)
+* [`unused_self`] [#5387](https://github.com/rust-lang/rust-clippy/pull/5387)
+* [`redundant_clone`] [#5453](https://github.com/rust-lang/rust-clippy/pull/5453)
+* [`precedence`] [#5445](https://github.com/rust-lang/rust-clippy/pull/5445)
+* [`suspicious_op_assign_impl`] [#5424](https://github.com/rust-lang/rust-clippy/pull/5424)
+* [`needless_lifetimes`] [#5293](https://github.com/rust-lang/rust-clippy/pull/5293)
+* [`redundant_pattern`] [#5287](https://github.com/rust-lang/rust-clippy/pull/5287)
+* [`inconsistent_digit_grouping`] [#5451](https://github.com/rust-lang/rust-clippy/pull/5451)
+
+
+### Suggestion Improvements
+
+* Improved [`question_mark`] lint suggestion so that it doesn't add redundant `as_ref()` [#5481](https://github.com/rust-lang/rust-clippy/pull/5481)
+* Improve the suggested placeholder in [`option_map_unit_fn`] [#5292](https://github.com/rust-lang/rust-clippy/pull/5292)
+* Improve suggestion for [`match_single_binding`] when triggered inside a closure [#5350](https://github.com/rust-lang/rust-clippy/pull/5350)
+
+### ICE Fixes
+
+* Handle the unstable `trivial_bounds` feature [#5296](https://github.com/rust-lang/rust-clippy/pull/5296)
+* `shadow_*` lints [#5297](https://github.com/rust-lang/rust-clippy/pull/5297)
+
+### Documentation
+
+* Fix documentation generation for configurable lints [#5353](https://github.com/rust-lang/rust-clippy/pull/5353)
+* Update documentation for [`new_ret_no_self`] [#5448](https://github.com/rust-lang/rust-clippy/pull/5448)
+* The documentation for [`option_option`] now suggest using a tri-state enum [#5403](https://github.com/rust-lang/rust-clippy/pull/5403)
+* Fix bit mask example in [`verbose_bit_mask`] documentation [#5454](https://github.com/rust-lang/rust-clippy/pull/5454)
+* [`wildcard_imports`] documentation now mentions that `use ...::prelude::*` is
+ not linted [#5312](https://github.com/rust-lang/rust-clippy/pull/5312)
+
+## Rust 1.43
+
+Released 2020-04-23
+
+[4ee1206...204bb9b](https://github.com/rust-lang/rust-clippy/compare/4ee1206...204bb9b)
+
+### New lints
+
+* [`imprecise_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`suboptimal_flops`] [#4897](https://github.com/rust-lang/rust-clippy/pull/4897)
+* [`wildcard_imports`] [#5029](https://github.com/rust-lang/rust-clippy/pull/5029)
+* [`single_component_path_imports`] [#5058](https://github.com/rust-lang/rust-clippy/pull/5058)
+* [`match_single_binding`] [#5061](https://github.com/rust-lang/rust-clippy/pull/5061)
+* [`let_underscore_lock`] [#5101](https://github.com/rust-lang/rust-clippy/pull/5101)
+* [`struct_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`fn_params_excessive_bools`] [#5125](https://github.com/rust-lang/rust-clippy/pull/5125)
+* [`option_env_unwrap`] [#5148](https://github.com/rust-lang/rust-clippy/pull/5148)
+* [`lossy_float_literal`] [#5202](https://github.com/rust-lang/rust-clippy/pull/5202)
+* [`rest_pat_in_fully_bound_structs`] [#5258](https://github.com/rust-lang/rust-clippy/pull/5258)
+
+### Moves and Deprecations
+
+* Move [`unneeded_field_pattern`] to pedantic group [#5200](https://github.com/rust-lang/rust-clippy/pull/5200)
+
+### Enhancements
+
+* Make [`missing_errors_doc`] lint also trigger on `async` functions
+ [#5181](https://github.com/rust-lang/rust-clippy/pull/5181)
+* Add more constants to [`approx_constant`] [#5193](https://github.com/rust-lang/rust-clippy/pull/5193)
+* Extend [`question_mark`] lint [#5266](https://github.com/rust-lang/rust-clippy/pull/5266)
+
+### False Positive Fixes
+
+* [`use_debug`] [#5047](https://github.com/rust-lang/rust-clippy/pull/5047)
+* [`unnecessary_unwrap`] [#5132](https://github.com/rust-lang/rust-clippy/pull/5132)
+* [`zero_prefixed_literal`] [#5170](https://github.com/rust-lang/rust-clippy/pull/5170)
+* [`missing_const_for_fn`] [#5216](https://github.com/rust-lang/rust-clippy/pull/5216)
+
+### Suggestion Improvements
+
+* Improve suggestion when blocks of code are suggested [#5134](https://github.com/rust-lang/rust-clippy/pull/5134)
+
+### ICE Fixes
+
+* `misc_early` lints [#5129](https://github.com/rust-lang/rust-clippy/pull/5129)
+* [`missing_errors_doc`] [#5213](https://github.com/rust-lang/rust-clippy/pull/5213)
+* Fix ICE when evaluating `usize`s [#5256](https://github.com/rust-lang/rust-clippy/pull/5256)
+
+### Documentation
+
+* Improve documentation of [`iter_nth_zero`]
+* Add documentation pages for stable releases [#5171](https://github.com/rust-lang/rust-clippy/pull/5171)
+
+### Others
+
+* Clippy now completely runs on GitHub Actions [#5190](https://github.com/rust-lang/rust-clippy/pull/5190)
+
+
+## Rust 1.42
+
+Released 2020-03-12
+
+[69f99e7...4ee1206](https://github.com/rust-lang/rust-clippy/compare/69f99e7...4ee1206)
+
+### New lints
+
+* [`filetype_is_file`] [#4543](https://github.com/rust-lang/rust-clippy/pull/4543)
+* [`let_underscore_must_use`] [#4823](https://github.com/rust-lang/rust-clippy/pull/4823)
+* [`modulo_arithmetic`] [#4867](https://github.com/rust-lang/rust-clippy/pull/4867)
+* [`mem_replace_with_default`] [#4881](https://github.com/rust-lang/rust-clippy/pull/4881)
+* [`mutable_key_type`] [#4885](https://github.com/rust-lang/rust-clippy/pull/4885)
+* [`option_as_ref_deref`] [#4945](https://github.com/rust-lang/rust-clippy/pull/4945)
+* [`wildcard_in_or_patterns`] [#4960](https://github.com/rust-lang/rust-clippy/pull/4960)
+* [`iter_nth_zero`] [#4966](https://github.com/rust-lang/rust-clippy/pull/4966)
+* `invalid_atomic_ordering` [#4999](https://github.com/rust-lang/rust-clippy/pull/4999)
+* [`skip_while_next`] [#5067](https://github.com/rust-lang/rust-clippy/pull/5067)
+
+### Moves and Deprecations
+
+* Move [`transmute_float_to_int`] from nursery to complexity group
+ [#5015](https://github.com/rust-lang/rust-clippy/pull/5015)
+* Move [`range_plus_one`] to pedantic group [#5057](https://github.com/rust-lang/rust-clippy/pull/5057)
+* Move [`debug_assert_with_mut_call`] to nursery group [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Deprecate `unused_label` [#4930](https://github.com/rust-lang/rust-clippy/pull/4930)
+
+### Enhancements
+
+* Lint vectored IO in [`unused_io_amount`] [#5027](https://github.com/rust-lang/rust-clippy/pull/5027)
+* Make [`vec_box`] configurable by adding a size threshold [#5081](https://github.com/rust-lang/rust-clippy/pull/5081)
+* Also lint constants in [`cmp_nan`] [#4910](https://github.com/rust-lang/rust-clippy/pull/4910)
+* Fix false negative in [`expect_fun_call`] [#4915](https://github.com/rust-lang/rust-clippy/pull/4915)
+* Fix false negative in [`redundant_clone`] [#5017](https://github.com/rust-lang/rust-clippy/pull/5017)
+
+### False Positive Fixes
+
+* [`map_clone`] [#4937](https://github.com/rust-lang/rust-clippy/pull/4937)
+* [`replace_consts`] [#4977](https://github.com/rust-lang/rust-clippy/pull/4977)
+* [`let_and_return`] [#5008](https://github.com/rust-lang/rust-clippy/pull/5008)
+* [`eq_op`] [#5079](https://github.com/rust-lang/rust-clippy/pull/5079)
+* [`possible_missing_comma`] [#5083](https://github.com/rust-lang/rust-clippy/pull/5083)
+* [`debug_assert_with_mut_call`] [#5106](https://github.com/rust-lang/rust-clippy/pull/5106)
+* Don't trigger [`let_underscore_must_use`] in external macros
+ [#5082](https://github.com/rust-lang/rust-clippy/pull/5082)
+* Don't trigger [`empty_loop`] in `no_std` crates [#5086](https://github.com/rust-lang/rust-clippy/pull/5086)
+
+### Suggestion Improvements
+
+* `option_map_unwrap_or` [#4634](https://github.com/rust-lang/rust-clippy/pull/4634)
+* [`wildcard_enum_match_arm`] [#4934](https://github.com/rust-lang/rust-clippy/pull/4934)
+* [`cognitive_complexity`] [#4935](https://github.com/rust-lang/rust-clippy/pull/4935)
+* [`decimal_literal_representation`] [#4956](https://github.com/rust-lang/rust-clippy/pull/4956)
+* `unknown_clippy_lints` [#4963](https://github.com/rust-lang/rust-clippy/pull/4963)
+* [`explicit_into_iter_loop`] [#4978](https://github.com/rust-lang/rust-clippy/pull/4978)
+* [`useless_attribute`] [#5022](https://github.com/rust-lang/rust-clippy/pull/5022)
+* `if_let_some_result` [#5032](https://github.com/rust-lang/rust-clippy/pull/5032)
+
+### ICE fixes
+
+* [`unsound_collection_transmute`] [#4975](https://github.com/rust-lang/rust-clippy/pull/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](https://github.com/rust-lang/rust-clippy/compare/c8e3cfb...69f99e7)
+
+* New Lints:
+ * [`exit`] [#4697](https://github.com/rust-lang/rust-clippy/pull/4697)
+ * [`to_digit_is_some`] [#4801](https://github.com/rust-lang/rust-clippy/pull/4801)
+ * [`tabs_in_doc_comments`] [#4806](https://github.com/rust-lang/rust-clippy/pull/4806)
+ * [`large_stack_arrays`] [#4807](https://github.com/rust-lang/rust-clippy/pull/4807)
+ * [`same_functions_in_if_condition`] [#4814](https://github.com/rust-lang/rust-clippy/pull/4814)
+ * [`zst_offset`] [#4816](https://github.com/rust-lang/rust-clippy/pull/4816)
+ * [`as_conversions`] [#4821](https://github.com/rust-lang/rust-clippy/pull/4821)
+ * [`missing_errors_doc`] [#4884](https://github.com/rust-lang/rust-clippy/pull/4884)
+ * [`transmute_float_to_int`] [#4889](https://github.com/rust-lang/rust-clippy/pull/4889)
+* Remove plugin interface, see
+ [Inside Rust Blog](https://blog.rust-lang.org/inside-rust/2019/11/04/Clippy-removes-plugin-interface.html) for
+ details [#4714](https://github.com/rust-lang/rust-clippy/pull/4714)
+* Move [`use_self`] to nursery group [#4863](https://github.com/rust-lang/rust-clippy/pull/4863)
+* Deprecate `into_iter_on_array` [#4788](https://github.com/rust-lang/rust-clippy/pull/4788)
+* Expand [`string_lit_as_bytes`] to also trigger when literal has escapes
+ [#4808](https://github.com/rust-lang/rust-clippy/pull/4808)
+* Fix false positive in `comparison_chain` [#4842](https://github.com/rust-lang/rust-clippy/pull/4842)
+* Fix false positive in `while_immutable_condition` [#4730](https://github.com/rust-lang/rust-clippy/pull/4730)
+* Fix false positive in `explicit_counter_loop` [#4803](https://github.com/rust-lang/rust-clippy/pull/4803)
+* Fix false positive in `must_use_candidate` [#4794](https://github.com/rust-lang/rust-clippy/pull/4794)
+* Fix false positive in `print_with_newline` and `write_with_newline`
+ [#4769](https://github.com/rust-lang/rust-clippy/pull/4769)
+* Fix false positive in `derive_hash_xor_eq` [#4766](https://github.com/rust-lang/rust-clippy/pull/4766)
+* Fix false positive in `missing_inline_in_public_items` [#4870](https://github.com/rust-lang/rust-clippy/pull/4870)
+* Fix false positive in `string_add` [#4880](https://github.com/rust-lang/rust-clippy/pull/4880)
+* Fix false positive in `float_arithmetic` [#4851](https://github.com/rust-lang/rust-clippy/pull/4851)
+* Fix false positive in `cast_sign_loss` [#4883](https://github.com/rust-lang/rust-clippy/pull/4883)
+* Fix false positive in `manual_swap` [#4877](https://github.com/rust-lang/rust-clippy/pull/4877)
+* Fix ICEs occurring while checking some block expressions [#4772](https://github.com/rust-lang/rust-clippy/pull/4772)
+* Fix ICE in `use_self` [#4776](https://github.com/rust-lang/rust-clippy/pull/4776)
+* Fix ICEs related to `const_generics` [#4780](https://github.com/rust-lang/rust-clippy/pull/4780)
+* Display help when running `clippy-driver` without arguments, instead of ICEing
+ [#4810](https://github.com/rust-lang/rust-clippy/pull/4810)
+* Clippy has its own ICE message now [#4588](https://github.com/rust-lang/rust-clippy/pull/4588)
+* Show deprecated lints in the documentation again [#4757](https://github.com/rust-lang/rust-clippy/pull/4757)
+* Improve Documentation by adding positive examples to some lints
+ [#4832](https://github.com/rust-lang/rust-clippy/pull/4832)
+
+## Rust 1.40
+
+Released 2019-12-19
+
+[4e7e71b...c8e3cfb](https://github.com/rust-lang/rust-clippy/compare/4e7e71b...c8e3cfb)
+
+* New Lints:
+ * [`unneeded_wildcard_pattern`] [#4537](https://github.com/rust-lang/rust-clippy/pull/4537)
+ * [`needless_doctest_main`] [#4603](https://github.com/rust-lang/rust-clippy/pull/4603)
+ * [`suspicious_unary_op_formatting`] [#4615](https://github.com/rust-lang/rust-clippy/pull/4615)
+ * [`debug_assert_with_mut_call`] [#4680](https://github.com/rust-lang/rust-clippy/pull/4680)
+ * [`unused_self`] [#4619](https://github.com/rust-lang/rust-clippy/pull/4619)
+ * [`inefficient_to_string`] [#4683](https://github.com/rust-lang/rust-clippy/pull/4683)
+ * [`must_use_unit`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`must_use_candidate`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`double_must_use`] [#4560](https://github.com/rust-lang/rust-clippy/pull/4560)
+ * [`comparison_chain`] [#4569](https://github.com/rust-lang/rust-clippy/pull/4569)
+ * [`unsound_collection_transmute`] [#4592](https://github.com/rust-lang/rust-clippy/pull/4592)
+ * [`panic`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`unreachable`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * [`todo`] [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `option_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+ * `result_expect_used` [#4657](https://github.com/rust-lang/rust-clippy/pull/4657)
+* Move `redundant_clone` to perf group [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Move `manual_mul_add` to nursery group [#4736](https://github.com/rust-lang/rust-clippy/pull/4736)
+* Expand `unit_cmp` to also work with `assert_eq!`, `debug_assert_eq!`, `assert_ne!` and `debug_assert_ne!` [#4613](https://github.com/rust-lang/rust-clippy/pull/4613)
+* Expand `integer_arithmetic` to also detect mutating arithmetic like `+=` [#4585](https://github.com/rust-lang/rust-clippy/pull/4585)
+* Fix false positive in `nonminimal_bool` [#4568](https://github.com/rust-lang/rust-clippy/pull/4568)
+* Fix false positive in `missing_safety_doc` [#4611](https://github.com/rust-lang/rust-clippy/pull/4611)
+* Fix false positive in `cast_sign_loss` [#4614](https://github.com/rust-lang/rust-clippy/pull/4614)
+* Fix false positive in `redundant_clone` [#4509](https://github.com/rust-lang/rust-clippy/pull/4509)
+* Fix false positive in `try_err` [#4721](https://github.com/rust-lang/rust-clippy/pull/4721)
+* Fix false positive in `toplevel_ref_arg` [#4570](https://github.com/rust-lang/rust-clippy/pull/4570)
+* Fix false positive in `multiple_inherent_impl` [#4593](https://github.com/rust-lang/rust-clippy/pull/4593)
+* Improve more suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4575](https://github.com/rust-lang/rust-clippy/pull/4575)
+* Improve suggestion for `zero_ptr` [#4599](https://github.com/rust-lang/rust-clippy/pull/4599)
+* Improve suggestion for `explicit_counter_loop` [#4691](https://github.com/rust-lang/rust-clippy/pull/4691)
+* Improve suggestion for `mul_add` [#4602](https://github.com/rust-lang/rust-clippy/pull/4602)
+* Improve suggestion for `assertions_on_constants` [#4635](https://github.com/rust-lang/rust-clippy/pull/4635)
+* Fix ICE in `use_self` [#4671](https://github.com/rust-lang/rust-clippy/pull/4671)
+* Fix ICE when encountering const casts [#4590](https://github.com/rust-lang/rust-clippy/pull/4590)
+
+## Rust 1.39
+
+Released 2019-11-07
+
+[3aea860...4e7e71b](https://github.com/rust-lang/rust-clippy/compare/3aea860...4e7e71b)
+
+* New Lints:
+ * [`uninit_assumed_init`] [#4479](https://github.com/rust-lang/rust-clippy/pull/4479)
+ * [`flat_map_identity`] [#4231](https://github.com/rust-lang/rust-clippy/pull/4231)
+ * [`missing_safety_doc`] [#4535](https://github.com/rust-lang/rust-clippy/pull/4535)
+ * [`mem_replace_with_uninit`] [#4511](https://github.com/rust-lang/rust-clippy/pull/4511)
+ * [`suspicious_map`] [#4394](https://github.com/rust-lang/rust-clippy/pull/4394)
+ * `option_and_then_some` [#4386](https://github.com/rust-lang/rust-clippy/pull/4386)
+ * [`manual_saturating_arithmetic`] [#4498](https://github.com/rust-lang/rust-clippy/pull/4498)
+* Deprecate `unused_collect` lint. This is fully covered by rustc's `#[must_use]` on `collect` [#4348](https://github.com/rust-lang/rust-clippy/pull/4348)
+* Move `type_repetition_in_bounds` to pedantic group [#4403](https://github.com/rust-lang/rust-clippy/pull/4403)
+* Move `cast_lossless` to pedantic group [#4539](https://github.com/rust-lang/rust-clippy/pull/4539)
+* `temporary_cstring_as_ptr` now catches more cases [#4425](https://github.com/rust-lang/rust-clippy/pull/4425)
+* `use_self` now works in constructors, too [#4525](https://github.com/rust-lang/rust-clippy/pull/4525)
+* `cargo_common_metadata` now checks for license files [#4518](https://github.com/rust-lang/rust-clippy/pull/4518)
+* `cognitive_complexity` now includes the measured complexity in the warning message [#4469](https://github.com/rust-lang/rust-clippy/pull/4469)
+* Fix false positives in `block_in_if_*` lints [#4458](https://github.com/rust-lang/rust-clippy/pull/4458)
+* Fix false positive in `cast_lossless` [#4473](https://github.com/rust-lang/rust-clippy/pull/4473)
+* Fix false positive in `clone_on_copy` [#4411](https://github.com/rust-lang/rust-clippy/pull/4411)
+* Fix false positive in `deref_addrof` [#4487](https://github.com/rust-lang/rust-clippy/pull/4487)
+* Fix false positive in `too_many_lines` [#4490](https://github.com/rust-lang/rust-clippy/pull/4490)
+* Fix false positive in `new_ret_no_self` [#4365](https://github.com/rust-lang/rust-clippy/pull/4365)
+* Fix false positive in `manual_swap` [#4478](https://github.com/rust-lang/rust-clippy/pull/4478)
+* Fix false positive in `missing_const_for_fn` [#4450](https://github.com/rust-lang/rust-clippy/pull/4450)
+* Fix false positive in `extra_unused_lifetimes` [#4477](https://github.com/rust-lang/rust-clippy/pull/4477)
+* Fix false positive in `inherent_to_string` [#4460](https://github.com/rust-lang/rust-clippy/pull/4460)
+* Fix false positive in `map_entry` [#4495](https://github.com/rust-lang/rust-clippy/pull/4495)
+* Fix false positive in `unused_unit` [#4445](https://github.com/rust-lang/rust-clippy/pull/4445)
+* Fix false positive in `redundant_pattern` [#4489](https://github.com/rust-lang/rust-clippy/pull/4489)
+* Fix false positive in `wrong_self_convention` [#4369](https://github.com/rust-lang/rust-clippy/pull/4369)
+* Improve various suggestions and tests in preparation for the unstable `cargo fix --clippy` [#4558](https://github.com/rust-lang/rust-clippy/pull/4558)
+* Improve suggestions for `redundant_pattern_matching` [#4352](https://github.com/rust-lang/rust-clippy/pull/4352)
+* Improve suggestions for `explicit_write` [#4544](https://github.com/rust-lang/rust-clippy/pull/4544)
+* Improve suggestion for `or_fun_call` [#4522](https://github.com/rust-lang/rust-clippy/pull/4522)
+* Improve suggestion for `match_as_ref` [#4446](https://github.com/rust-lang/rust-clippy/pull/4446)
+* Improve suggestion for `unnecessary_fold_span` [#4382](https://github.com/rust-lang/rust-clippy/pull/4382)
+* Add suggestions for `unseparated_literal_suffix` [#4401](https://github.com/rust-lang/rust-clippy/pull/4401)
+* Add suggestions for `char_lit_as_u8` [#4418](https://github.com/rust-lang/rust-clippy/pull/4418)
+
+## Rust 1.38
+
+Released 2019-09-26
+
+[e3cb40e...3aea860](https://github.com/rust-lang/rust-clippy/compare/e3cb40e...3aea860)
+
+* New Lints:
+ * [`main_recursion`] [#4203](https://github.com/rust-lang/rust-clippy/pull/4203)
+ * [`inherent_to_string`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`inherent_to_string_shadow_display`] [#4259](https://github.com/rust-lang/rust-clippy/pull/4259)
+ * [`type_repetition_in_bounds`] [#3766](https://github.com/rust-lang/rust-clippy/pull/3766)
+ * [`try_err`] [#4222](https://github.com/rust-lang/rust-clippy/pull/4222)
+* Move `{unnnecessary,panicking}_unwrap` out of nursery [#4307](https://github.com/rust-lang/rust-clippy/pull/4307)
+* Extend the `use_self` lint to suggest uses of `Self::Variant` [#4308](https://github.com/rust-lang/rust-clippy/pull/4308)
+* Improve suggestion for needless return [#4262](https://github.com/rust-lang/rust-clippy/pull/4262)
+* Add auto-fixable suggestion for `let_unit` [#4337](https://github.com/rust-lang/rust-clippy/pull/4337)
+* Fix false positive in `pub_enum_variant_names` and `enum_variant_names` [#4345](https://github.com/rust-lang/rust-clippy/pull/4345)
+* Fix false positive in `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Fix false positive in `string_lit_as_bytes` [#4233](https://github.com/rust-lang/rust-clippy/pull/4233)
+* Fix false positive in `needless_lifetimes` [#4266](https://github.com/rust-lang/rust-clippy/pull/4266)
+* Fix false positive in `float_cmp` [#4275](https://github.com/rust-lang/rust-clippy/pull/4275)
+* Fix false positives in `needless_return` [#4274](https://github.com/rust-lang/rust-clippy/pull/4274)
+* Fix false negative in `match_same_arms` [#4246](https://github.com/rust-lang/rust-clippy/pull/4246)
+* Fix incorrect suggestion for `needless_bool` [#4335](https://github.com/rust-lang/rust-clippy/pull/4335)
+* Improve suggestion for `cast_ptr_alignment` [#4257](https://github.com/rust-lang/rust-clippy/pull/4257)
+* Improve suggestion for `single_char_literal` [#4361](https://github.com/rust-lang/rust-clippy/pull/4361)
+* Improve suggestion for `len_zero` [#4314](https://github.com/rust-lang/rust-clippy/pull/4314)
+* Fix ICE in `implicit_hasher` [#4268](https://github.com/rust-lang/rust-clippy/pull/4268)
+* Fix allow bug in `trivially_copy_pass_by_ref` [#4250](https://github.com/rust-lang/rust-clippy/pull/4250)
+
+## Rust 1.37
+
+Released 2019-08-15
+
+[082cfa7...e3cb40e](https://github.com/rust-lang/rust-clippy/compare/082cfa7...e3cb40e)
+
+* New Lints:
+ * [`checked_conversions`] [#4088](https://github.com/rust-lang/rust-clippy/pull/4088)
+ * [`get_last_with_len`] [#3832](https://github.com/rust-lang/rust-clippy/pull/3832)
+ * [`integer_division`] [#4195](https://github.com/rust-lang/rust-clippy/pull/4195)
+* Renamed Lint: `const_static_lifetime` is now called [`redundant_static_lifetimes`].
+ The lint now covers statics in addition to consts [#4162](https://github.com/rust-lang/rust-clippy/pull/4162)
+* [`match_same_arms`] now warns for all identical arms, instead of only the first one [#4102](https://github.com/rust-lang/rust-clippy/pull/4102)
+* [`needless_return`] now works with void functions [#4220](https://github.com/rust-lang/rust-clippy/pull/4220)
+* Fix false positive in [`redundant_closure`] [#4190](https://github.com/rust-lang/rust-clippy/pull/4190)
+* Fix false positive in [`useless_attribute`] [#4107](https://github.com/rust-lang/rust-clippy/pull/4107)
+* Fix incorrect suggestion for [`float_cmp`] [#4214](https://github.com/rust-lang/rust-clippy/pull/4214)
+* Add suggestions for [`print_with_newline`] and [`write_with_newline`] [#4136](https://github.com/rust-lang/rust-clippy/pull/4136)
+* Improve suggestions for `option_map_unwrap_or_else` and `result_map_unwrap_or_else` [#4164](https://github.com/rust-lang/rust-clippy/pull/4164)
+* Improve suggestions for [`non_ascii_literal`] [#4119](https://github.com/rust-lang/rust-clippy/pull/4119)
+* Improve diagnostics for [`let_and_return`] [#4137](https://github.com/rust-lang/rust-clippy/pull/4137)
+* Improve diagnostics for [`trivially_copy_pass_by_ref`] [#4071](https://github.com/rust-lang/rust-clippy/pull/4071)
+* Add macro check for [`unreadable_literal`] [#4099](https://github.com/rust-lang/rust-clippy/pull/4099)
+
+## Rust 1.36
+
+Released 2019-07-04
+
+[eb9f9b1...082cfa7](https://github.com/rust-lang/rust-clippy/compare/eb9f9b1...082cfa7)
+
+* New lints: [`find_map`], [`filter_map_next`] [#4039](https://github.com/rust-lang/rust-clippy/pull/4039)
+* New lint: [`path_buf_push_overwrite`] [#3954](https://github.com/rust-lang/rust-clippy/pull/3954)
+* Move `path_buf_push_overwrite` to the nursery [#4013](https://github.com/rust-lang/rust-clippy/pull/4013)
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* Allow allowing of [`toplevel_ref_arg`] lint [#4007](https://github.com/rust-lang/rust-clippy/pull/4007)
+* Fix false negative in [`or_fun_call`] pertaining to nested constructors [#4084](https://github.com/rust-lang/rust-clippy/pull/4084)
+* Fix false positive in [`or_fun_call`] pertaining to enum variant constructors [#4018](https://github.com/rust-lang/rust-clippy/pull/4018)
+* Fix false positive in [`useless_let_if_seq`] pertaining to interior mutability [#4035](https://github.com/rust-lang/rust-clippy/pull/4035)
+* Fix false positive in [`redundant_closure`] pertaining to non-function types [#4008](https://github.com/rust-lang/rust-clippy/pull/4008)
+* Fix false positive in [`let_and_return`] pertaining to attributes on `let`s [#4024](https://github.com/rust-lang/rust-clippy/pull/4024)
+* Fix false positive in [`module_name_repetitions`] lint pertaining to attributes [#4006](https://github.com/rust-lang/rust-clippy/pull/4006)
+* Fix false positive on [`assertions_on_constants`] pertaining to `debug_assert!` [#3989](https://github.com/rust-lang/rust-clippy/pull/3989)
+* Improve suggestion in [`map_clone`] to suggest `.copied()` where applicable [#3970](https://github.com/rust-lang/rust-clippy/pull/3970) [#4043](https://github.com/rust-lang/rust-clippy/pull/4043)
+* Improve suggestion for [`search_is_some`] [#4049](https://github.com/rust-lang/rust-clippy/pull/4049)
+* Improve suggestion applicability for [`naive_bytecount`] [#3984](https://github.com/rust-lang/rust-clippy/pull/3984)
+* Improve suggestion applicability for [`while_let_loop`] [#3975](https://github.com/rust-lang/rust-clippy/pull/3975)
+* Improve diagnostics for [`too_many_arguments`] [#4053](https://github.com/rust-lang/rust-clippy/pull/4053)
+* Improve diagnostics for [`cast_lossless`] [#4021](https://github.com/rust-lang/rust-clippy/pull/4021)
+* Deal with macro checks in desugarings better [#4082](https://github.com/rust-lang/rust-clippy/pull/4082)
+* Add macro check for [`unnecessary_cast`] [#4026](https://github.com/rust-lang/rust-clippy/pull/4026)
+* Remove [`approx_constant`]'s documentation's "Known problems" section. [#4027](https://github.com/rust-lang/rust-clippy/pull/4027)
+* Fix ICE in [`suspicious_else_formatting`] [#3960](https://github.com/rust-lang/rust-clippy/pull/3960)
+* Fix ICE in [`decimal_literal_representation`] [#3931](https://github.com/rust-lang/rust-clippy/pull/3931)
+
+
+## Rust 1.35
+
+Released 2019-05-20
+
+[1fac380..37f5c1e](https://github.com/rust-lang/rust-clippy/compare/1fac380...37f5c1e)
+
+* New lint: `drop_bounds` to detect `T: Drop` bounds
+* Split [`redundant_closure`] into [`redundant_closure`] and [`redundant_closure_for_method_calls`] [#4110](https://github.com/rust-lang/rust-clippy/pull/4101)
+* 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](https://github.com/rust-lang/rust-clippy/pull/3805), [#3772](https://github.com/rust-lang/rust-clippy/pull/3772), [#3741](https://github.com/rust-lang/rust-clippy/pull/3741)
+
+## Rust 1.34
+
+Released 2019-04-10
+
+[1b89724...1fac380](https://github.com/rust-lang/rust-clippy/compare/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][pull3665] for more details.
+* We now have [improved documentation][adding_lints] on how to add new lints
+
+## Rust 1.33
+
+Released 2019-02-26
+
+[b2601be...1b89724](https://github.com/rust-lang/rust-clippy/compare/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](https://github.com/rust-lang/rust-clippy/compare/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](https://github.com/rust-lang/rust-clippy/compare/125907ad..2e26fdc2)
+
+* Clippy has been relicensed under a dual MIT / Apache license.
+ See [#3093](https://github.com/rust-lang/rust-clippy/issues/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](https://github.com/rust-lang/rust-clippy/compare/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 `\n`s 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](https://github.com/rust-lang/rust-clippy/compare/v0.0.212...14207503)
+
+* :tada: :tada: **Rust 1.29 is the first stable Rust that includes a bundled Clippy** :tada:
+ :tada:
+ 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 :smile:)
+* 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`]
+
+[`AsMut`]: https://doc.rust-lang.org/std/convert/trait.AsMut.html
+[`AsRef`]: https://doc.rust-lang.org/std/convert/trait.AsRef.html
+[configuration file]: ./rust-clippy#configuration
+[pull3665]: https://github.com/rust-lang/rust-clippy/pull/3665
+[adding_lints]: https://github.com/rust-lang/rust-clippy/blob/master/doc/adding_lints.md
+[`README.md`]: https://github.com/rust-lang/rust-clippy/blob/master/README.md
+
+<!-- lint disable no-unused-definitions -->
+<!-- begin autogenerated links to lint list -->
+[`absurd_extreme_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#absurd_extreme_comparisons
+[`almost_swapped`]: https://rust-lang.github.io/rust-clippy/master/index.html#almost_swapped
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+[`separated_literal_suffix`]: https://rust-lang.github.io/rust-clippy/master/index.html#separated_literal_suffix
+[`serde_api_misuse`]: https://rust-lang.github.io/rust-clippy/master/index.html#serde_api_misuse
+[`shadow_reuse`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_reuse
+[`shadow_same`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_same
+[`shadow_unrelated`]: https://rust-lang.github.io/rust-clippy/master/index.html#shadow_unrelated
+[`short_circuit_statement`]: https://rust-lang.github.io/rust-clippy/master/index.html#short_circuit_statement
+[`should_assert_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#should_assert_eq
+[`should_implement_trait`]: https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
+[`similar_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#similar_names
+[`single_char_add_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_add_str
+[`single_char_lifetime_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_lifetime_names
+[`single_char_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
+[`single_component_path_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports
+[`single_element_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_element_loop
+[`single_match`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match
+[`single_match_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match_else
+[`size_of_in_element_count`]: https://rust-lang.github.io/rust-clippy/master/index.html#size_of_in_element_count
+[`skip_while_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#skip_while_next
+[`slow_vector_initialization`]: https://rust-lang.github.io/rust-clippy/master/index.html#slow_vector_initialization
+[`stable_sort_primitive`]: https://rust-lang.github.io/rust-clippy/master/index.html#stable_sort_primitive
+[`str_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#str_to_string
+[`string_add`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add
+[`string_add_assign`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_add_assign
+[`string_extend_chars`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_extend_chars
+[`string_from_utf8_as_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_from_utf8_as_bytes
+[`string_lit_as_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
+[`string_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_slice
+[`string_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_to_string
+[`strlen_on_c_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#strlen_on_c_strings
+[`struct_excessive_bools`]: https://rust-lang.github.io/rust-clippy/master/index.html#struct_excessive_bools
+[`suboptimal_flops`]: https://rust-lang.github.io/rust-clippy/master/index.html#suboptimal_flops
+[`suspicious_arithmetic_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_arithmetic_impl
+[`suspicious_assignment_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_assignment_formatting
+[`suspicious_else_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_else_formatting
+[`suspicious_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_map
+[`suspicious_op_assign_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_op_assign_impl
+[`suspicious_operation_groupings`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_operation_groupings
+[`suspicious_splitn`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_splitn
+[`suspicious_unary_op_formatting`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_unary_op_formatting
+[`tabs_in_doc_comments`]: https://rust-lang.github.io/rust-clippy/master/index.html#tabs_in_doc_comments
+[`temporary_assignment`]: https://rust-lang.github.io/rust-clippy/master/index.html#temporary_assignment
+[`to_digit_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_digit_is_some
+[`to_string_in_display`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_display
+[`to_string_in_format_args`]: https://rust-lang.github.io/rust-clippy/master/index.html#to_string_in_format_args
+[`todo`]: https://rust-lang.github.io/rust-clippy/master/index.html#todo
+[`too_many_arguments`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
+[`too_many_lines`]: https://rust-lang.github.io/rust-clippy/master/index.html#too_many_lines
+[`toplevel_ref_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
+[`trailing_empty_array`]: https://rust-lang.github.io/rust-clippy/master/index.html#trailing_empty_array
+[`trait_duplication_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#trait_duplication_in_bounds
+[`transmute_bytes_to_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_bytes_to_str
+[`transmute_float_to_int`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_float_to_int
+[`transmute_int_to_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_bool
+[`transmute_int_to_char`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_char
+[`transmute_int_to_float`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_int_to_float
+[`transmute_num_to_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_num_to_bytes
+[`transmute_ptr_to_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ptr
+[`transmute_ptr_to_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmute_ptr_to_ref
+[`transmutes_expressible_as_ptr_casts`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmutes_expressible_as_ptr_casts
+[`transmuting_null`]: https://rust-lang.github.io/rust-clippy/master/index.html#transmuting_null
+[`trivial_regex`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
+[`trivially_copy_pass_by_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
+[`try_err`]: https://rust-lang.github.io/rust-clippy/master/index.html#try_err
+[`type_complexity`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
+[`type_repetition_in_bounds`]: https://rust-lang.github.io/rust-clippy/master/index.html#type_repetition_in_bounds
+[`undocumented_unsafe_blocks`]: https://rust-lang.github.io/rust-clippy/master/index.html#undocumented_unsafe_blocks
+[`undropped_manually_drops`]: https://rust-lang.github.io/rust-clippy/master/index.html#undropped_manually_drops
+[`unicode_not_nfc`]: https://rust-lang.github.io/rust-clippy/master/index.html#unicode_not_nfc
+[`unimplemented`]: https://rust-lang.github.io/rust-clippy/master/index.html#unimplemented
+[`uninit_assumed_init`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_assumed_init
+[`uninit_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#uninit_vec
+[`unit_arg`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
+[`unit_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_cmp
+[`unit_hash`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_hash
+[`unit_return_expecting_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#unit_return_expecting_ord
+[`unnecessary_cast`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
+[`unnecessary_filter_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_filter_map
+[`unnecessary_fold`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_fold
+[`unnecessary_lazy_evaluations`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_lazy_evaluations
+[`unnecessary_mut_passed`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_mut_passed
+[`unnecessary_operation`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_operation
+[`unnecessary_self_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_self_imports
+[`unnecessary_sort_by`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_sort_by
+[`unnecessary_to_owned`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_to_owned
+[`unnecessary_unwrap`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap
+[`unnecessary_wraps`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_wraps
+[`unneeded_field_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
+[`unneeded_wildcard_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_wildcard_pattern
+[`unnested_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#unnested_or_patterns
+[`unreachable`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreachable
+[`unreadable_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
+[`unsafe_derive_deserialize`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_derive_deserialize
+[`unsafe_removed_from_name`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_removed_from_name
+[`unsafe_vector_initialization`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsafe_vector_initialization
+[`unseparated_literal_suffix`]: https://rust-lang.github.io/rust-clippy/master/index.html#unseparated_literal_suffix
+[`unsound_collection_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#unsound_collection_transmute
+[`unstable_as_mut_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#unstable_as_mut_slice
+[`unstable_as_slice`]: https://rust-lang.github.io/rust-clippy/master/index.html#unstable_as_slice
+[`unused_async`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_async
+[`unused_collect`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_collect
+[`unused_io_amount`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
+[`unused_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_self
+[`unused_unit`]: https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
+[`unusual_byte_groupings`]: https://rust-lang.github.io/rust-clippy/master/index.html#unusual_byte_groupings
+[`unwrap_in_result`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_in_result
+[`unwrap_or_else_default`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_or_else_default
+[`unwrap_used`]: https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_used
+[`upper_case_acronyms`]: https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
+[`use_debug`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_debug
+[`use_self`]: https://rust-lang.github.io/rust-clippy/master/index.html#use_self
+[`used_underscore_binding`]: https://rust-lang.github.io/rust-clippy/master/index.html#used_underscore_binding
+[`useless_asref`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
+[`useless_attribute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_attribute
+[`useless_conversion`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
+[`useless_format`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
+[`useless_let_if_seq`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
+[`useless_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_transmute
+[`useless_vec`]: https://rust-lang.github.io/rust-clippy/master/index.html#useless_vec
+[`vec_box`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_box
+[`vec_init_then_push`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_init_then_push
+[`vec_resize_to_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#vec_resize_to_zero
+[`verbose_bit_mask`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_bit_mask
+[`verbose_file_reads`]: https://rust-lang.github.io/rust-clippy/master/index.html#verbose_file_reads
+[`vtable_address_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#vtable_address_comparisons
+[`while_immutable_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_immutable_condition
+[`while_let_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
+[`while_let_on_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#while_let_on_iterator
+[`wildcard_dependencies`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_dependencies
+[`wildcard_enum_match_arm`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_enum_match_arm
+[`wildcard_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_imports
+[`wildcard_in_or_patterns`]: https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_in_or_patterns
+[`write_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#write_literal
+[`write_with_newline`]: https://rust-lang.github.io/rust-clippy/master/index.html#write_with_newline
+[`writeln_empty_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#writeln_empty_string
+[`wrong_pub_self_convention`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_pub_self_convention
+[`wrong_self_convention`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_self_convention
+[`wrong_transmute`]: https://rust-lang.github.io/rust-clippy/master/index.html#wrong_transmute
+[`zero_divided_by_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_divided_by_zero
+[`zero_prefixed_literal`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_prefixed_literal
+[`zero_ptr`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_ptr
+[`zero_sized_map_values`]: https://rust-lang.github.io/rust-clippy/master/index.html#zero_sized_map_values
+[`zst_offset`]: https://rust-lang.github.io/rust-clippy/master/index.html#zst_offset
+<!-- end autogenerated links to lint list -->
--- /dev/null
- path.set_file_name("cargo-clippy");
+//! `bless` updates the reference files in the repo with changed output files
+//! from the last test run.
+
+use std::ffi::OsStr;
+use std::fs;
+use std::lazy::SyncLazy;
+use std::path::{Path, PathBuf};
+use walkdir::WalkDir;
+
+use crate::clippy_project_root;
+
++#[cfg(not(windows))]
++static CARGO_CLIPPY_EXE: &str = "cargo-clippy";
++#[cfg(windows)]
++static CARGO_CLIPPY_EXE: &str = "cargo-clippy.exe";
++
+static CLIPPY_BUILD_TIME: SyncLazy<Option<std::time::SystemTime>> = SyncLazy::new(|| {
+ let mut path = std::env::current_exe().unwrap();
++ path.set_file_name(CARGO_CLIPPY_EXE);
+ fs::metadata(path).ok()?.modified().ok()
+});
+
+/// # Panics
+///
+/// Panics if the path to a test file is broken
+pub fn bless(ignore_timestamp: bool) {
+ let test_suite_dirs = [
+ clippy_project_root().join("tests").join("ui"),
+ clippy_project_root().join("tests").join("ui-internal"),
+ clippy_project_root().join("tests").join("ui-toml"),
+ clippy_project_root().join("tests").join("ui-cargo"),
+ ];
+ for test_suite_dir in &test_suite_dirs {
+ WalkDir::new(test_suite_dir)
+ .into_iter()
+ .filter_map(Result::ok)
+ .filter(|f| f.path().extension() == Some(OsStr::new("rs")))
+ .for_each(|f| {
+ let test_name = f.path().strip_prefix(test_suite_dir).unwrap();
+ for &ext in &["stdout", "stderr", "fixed"] {
+ let test_name_ext = format!("stage-id.{}", ext);
+ update_reference_file(
+ f.path().with_extension(ext),
+ test_name.with_extension(test_name_ext),
+ ignore_timestamp,
+ );
+ }
+ });
+ }
+}
+
+fn update_reference_file(reference_file_path: PathBuf, test_name: PathBuf, ignore_timestamp: bool) {
+ let test_output_path = build_dir().join(test_name);
+ let relative_reference_file_path = reference_file_path.strip_prefix(clippy_project_root()).unwrap();
+
+ // If compiletest did not write any changes during the test run,
+ // we don't have to update anything
+ if !test_output_path.exists() {
+ return;
+ }
+
+ // If the test output was not updated since the last clippy build, it may be outdated
+ if !ignore_timestamp && !updated_since_clippy_build(&test_output_path).unwrap_or(true) {
+ return;
+ }
+
+ let test_output_file = fs::read(&test_output_path).expect("Unable to read test output file");
+ let reference_file = fs::read(&reference_file_path).unwrap_or_default();
+
+ if test_output_file != reference_file {
+ // If a test run caused an output file to change, update the reference file
+ println!("updating {}", &relative_reference_file_path.display());
+ fs::copy(test_output_path, &reference_file_path).expect("Could not update reference file");
+
+ // We need to re-read the file now because it was potentially updated from copying
+ let reference_file = fs::read(&reference_file_path).unwrap_or_default();
+
+ if reference_file.is_empty() {
+ // If we copied over an empty output file, we remove the now empty reference file
+ println!("removing {}", &relative_reference_file_path.display());
+ fs::remove_file(reference_file_path).expect("Could not remove reference file");
+ }
+ }
+}
+
+fn updated_since_clippy_build(path: &Path) -> Option<bool> {
+ let clippy_build_time = (*CLIPPY_BUILD_TIME)?;
+ let modified = fs::metadata(path).ok()?.modified().ok()?;
+ Some(modified >= clippy_build_time)
+}
+
+fn build_dir() -> PathBuf {
+ let mut path = std::env::current_exe().unwrap();
+ path.set_file_name("test");
+ path
+}
--- /dev/null
- .env("__CLIPPY_INTERNAL_TESTS", "true")
+use std::process::{self, Command};
+
+pub fn run(filename: &str) {
+ let code = Command::new("cargo")
+ .args(["run", "--bin", "clippy-driver", "--"])
+ .args(["-L", "./target/debug"])
+ .args(["-Z", "no-codegen"])
+ .args(["--edition", "2021"])
+ .arg(filename)
+ .status()
+ .expect("failed to run cargo")
+ .code();
+
+ if code.is_none() {
+ eprintln!("Killed by signal");
+ }
+
+ process::exit(code.unwrap_or(1));
+}
--- /dev/null
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_no_std_crate;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::{meets_msrv, msrvs};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, TyKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `&expr as *const T` or
+ /// `&mut expr as *mut T`, and suggest using `ptr::addr_of` or
+ /// `ptr::addr_of_mut` instead.
+ ///
+ /// ### Why is this bad?
+ /// This would improve readability and avoid creating a reference
+ /// that points to an uninitialized value or unaligned place.
+ /// Read the `ptr::addr_of` docs for more information.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let val = 1;
+ /// let p = &val as *const i32;
+ ///
+ /// let mut val_mut = 1;
+ /// let p_mut = &mut val_mut as *mut i32;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let val = 1;
+ /// let p = std::ptr::addr_of!(val);
+ ///
+ /// let mut val_mut = 1;
+ /// let p_mut = std::ptr::addr_of_mut!(val_mut);
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub BORROW_AS_PTR,
+ pedantic,
+ "borrowing just to cast to a raw pointer"
+}
+
+impl_lint_pass!(BorrowAsPtr => [BORROW_AS_PTR]);
+
+pub struct BorrowAsPtr {
+ msrv: Option<RustcVersion>,
+}
+
+impl BorrowAsPtr {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for BorrowAsPtr {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if !meets_msrv(self.msrv.as_ref(), &msrvs::BORROW_AS_PTR) {
+ return;
+ }
+
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::Cast(left_expr, ty) = &expr.kind;
+ if let TyKind::Ptr(_) = ty.kind;
+ if let ExprKind::AddrOf(BorrowKind::Ref, mutability, e) = &left_expr.kind;
+
+ then {
+ let core_or_std = if is_no_std_crate(cx) { "core" } else { "std" };
+ let macro_name = match mutability {
+ Mutability::Not => "addr_of",
+ Mutability::Mut => "addr_of_mut",
+ };
+
+ span_lint_and_sugg(
+ cx,
+ BORROW_AS_PTR,
+ expr.span,
+ "borrow as raw pointer",
+ "try",
+ format!(
+ "{}::ptr::{}!({})",
+ core_or_std,
+ macro_name,
+ snippet_opt(cx, e.span).unwrap()
+ ),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
++
++ extract_msrv_attr!(LateContext);
+}
--- /dev/null
- if let Some(src) = snippet_opt(cx, lit.span);
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::numeric_literal::NumericLiteral;
+use clippy_utils::source::snippet_opt;
+use if_chain::if_chain;
+use rustc_ast::{LitFloatType, LitIntType, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::{Expr, ExprKind, Lit, UnOp};
+use rustc_lint::{LateContext, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, FloatTy, InferTy, Ty};
+
+use super::UNNECESSARY_CAST;
+
+pub(super) fn check(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ cast_expr: &Expr<'_>,
+ cast_from: Ty<'_>,
+ cast_to: Ty<'_>,
+) -> bool {
+ if let Some(lit) = get_numeric_literal(cast_expr) {
+ let literal_str = snippet_opt(cx, cast_expr.span).unwrap_or_default();
+
+ if_chain! {
+ if let LitKind::Int(n, _) = lit.node;
- let literal_str = if is_unary_neg(cast_expr) { format!("-{}", num_lit.integer) } else { num_lit.integer.into() };
- lint_unnecessary_cast(cx, expr, &literal_str, cast_from, cast_to);
++ if let Some(src) = snippet_opt(cx, cast_expr.span);
+ if cast_to.is_floating_point();
+ if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit.node);
+ let from_nbits = 128 - n.leading_zeros();
+ let to_nbits = fp_ty_mantissa_nbits(cast_to);
+ if from_nbits != 0 && to_nbits != 0 && from_nbits <= to_nbits && num_lit.is_decimal();
+ then {
- if let Some(src) = snippet_opt(cx, lit.span) {
++ lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+ return true
+ }
+ }
+
+ match lit.node {
+ LitKind::Int(_, LitIntType::Unsuffixed) if cast_to.is_integral() => {
+ lint_unnecessary_cast(cx, expr, &literal_str, cast_from, cast_to);
+ },
+ LitKind::Float(_, LitFloatType::Unsuffixed) if cast_to.is_floating_point() => {
+ lint_unnecessary_cast(cx, expr, &literal_str, cast_from, cast_to);
+ },
+ LitKind::Int(_, LitIntType::Unsuffixed) | LitKind::Float(_, LitFloatType::Unsuffixed) => {},
+ LitKind::Int(_, LitIntType::Signed(_) | LitIntType::Unsigned(_))
+ | LitKind::Float(_, LitFloatType::Suffixed(_))
+ if cast_from.kind() == cast_to.kind() =>
+ {
-
- fn is_unary_neg(expr: &Expr<'_>) -> bool {
- matches!(expr.kind, ExprKind::Unary(UnOp::Neg, _))
- }
++ if let Some(src) = snippet_opt(cx, cast_expr.span) {
+ if let Some(num_lit) = NumericLiteral::from_lit_kind(&src, &lit.node) {
+ lint_unnecessary_cast(cx, expr, num_lit.integer, cast_from, cast_to);
+ }
+ }
+ },
+ _ => {
+ if cast_from.kind() == cast_to.kind() && !in_external_macro(cx.sess(), expr.span) {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_CAST,
+ expr.span,
+ &format!(
+ "casting to the same type is unnecessary (`{}` -> `{}`)",
+ cast_from, cast_to
+ ),
+ "try",
+ literal_str,
+ Applicability::MachineApplicable,
+ );
+ return true;
+ }
+ },
+ }
+ }
+
+ false
+}
+
+fn lint_unnecessary_cast(cx: &LateContext<'_>, expr: &Expr<'_>, literal_str: &str, cast_from: Ty<'_>, cast_to: Ty<'_>) {
+ let literal_kind_name = if cast_from.is_integral() { "integer" } else { "float" };
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_CAST,
+ expr.span,
+ &format!("casting {} literal to `{}` is unnecessary", literal_kind_name, cast_to),
+ "try",
+ format!("{}_{}", literal_str.trim_end_matches('.'), cast_to),
+ Applicability::MachineApplicable,
+ );
+}
+
+fn get_numeric_literal<'e>(expr: &'e Expr<'e>) -> Option<&'e Lit> {
+ match expr.kind {
+ ExprKind::Lit(ref lit) => Some(lit),
+ ExprKind::Unary(UnOp::Neg, e) => {
+ if let ExprKind::Lit(ref lit) = e.kind {
+ Some(lit)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+/// Returns the mantissa bits wide of a fp type.
+/// Will return 0 if the type is not a fp
+fn fp_ty_mantissa_nbits(typ: Ty<'_>) -> u32 {
+ match typ.kind() {
+ ty::Float(FloatTy::F32) => 23,
+ ty::Float(FloatTy::F64) | ty::Infer(InferTy::FloatVar(_)) => 52,
+ _ => 0,
+ }
+}
--- /dev/null
- use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
+use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
++use clippy_utils::sugg::has_enclosing_paren;
+use clippy_utils::ty::peel_mid_ty_refs;
+use clippy_utils::{get_parent_expr, get_parent_node, is_lint_allowed, path_to_local};
+use rustc_ast::util::parser::{PREC_POSTFIX, PREC_PREFIX};
+use rustc_data_structures::fx::FxIndexMap;
+use rustc_errors::Applicability;
+use rustc_hir::{
+ BindingAnnotation, Body, BodyId, BorrowKind, Destination, Expr, ExprKind, HirId, MatchSource, Mutability, Node,
+ Pat, PatKind, UnOp,
+};
+use rustc_lint::{LateContext, LateLintPass};
- use std::iter;
++use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
+use rustc_middle::ty::{self, Ty, TyCtxt, TyS, TypeckResults};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{symbol::sym, Span};
- /// The required mutability
- target_mut: Mutability,
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for explicit `deref()` or `deref_mut()` method calls.
+ ///
+ /// ### Why is this bad?
+ /// Dereferencing by `&*x` or `&mut *x` is clearer and more concise,
+ /// when not part of a method chain.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::ops::Deref;
+ /// let a: &mut String = &mut String::from("foo");
+ /// let b: &str = a.deref();
+ /// ```
+ /// Could be written as:
+ /// ```rust
+ /// let a: &mut String = &mut String::from("foo");
+ /// let b = &*a;
+ /// ```
+ ///
+ /// This lint excludes
+ /// ```rust,ignore
+ /// let _ = d.unwrap().deref();
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub EXPLICIT_DEREF_METHODS,
+ pedantic,
+ "Explicit use of deref or deref_mut method while not in a method chain."
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for address of operations (`&`) that are going to
+ /// be dereferenced immediately by the compiler.
+ ///
+ /// ### Why is this bad?
+ /// Suggests that the receiver of the expression borrows
+ /// the expression.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn fun(_a: &i32) {}
+ ///
+ /// // Bad
+ /// let x: &i32 = &&&&&&5;
+ /// fun(&x);
+ ///
+ /// // Good
+ /// let x: &i32 = &5;
+ /// fun(x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEEDLESS_BORROW,
+ style,
+ "taking a reference that is going to be automatically dereferenced"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `ref` bindings which create a reference to a reference.
+ ///
+ /// ### Why is this bad?
+ /// The address-of operator at the use site is clearer about the need for a reference.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let x = Some("");
+ /// if let Some(ref x) = x {
+ /// // use `x` here
+ /// }
+ ///
+ /// // Good
+ /// let x = Some("");
+ /// if let Some(x) = x {
+ /// // use `&x` here
+ /// }
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub REF_BINDING_TO_REFERENCE,
+ pedantic,
+ "`ref` binding to a reference"
+}
+
+impl_lint_pass!(Dereferencing => [
+ EXPLICIT_DEREF_METHODS,
+ NEEDLESS_BORROW,
+ REF_BINDING_TO_REFERENCE,
+]);
+
+#[derive(Default)]
+pub struct Dereferencing {
+ state: Option<(State, StateData)>,
+
+ // While parsing a `deref` method call in ufcs form, the path to the function is itself an
+ // expression. This is to store the id of that expression so it can be skipped when
+ // `check_expr` is called for it.
+ skip_expr: Option<HirId>,
+
+ /// The body the first local was found in. Used to emit lints when the traversal of the body has
+ /// been finished. Note we can't lint at the end of every body as they can be nested within each
+ /// other.
+ current_body: Option<BodyId>,
+ /// The list of locals currently being checked by the lint.
+ /// If the value is `None`, then the binding has been seen as a ref pattern, but is not linted.
+ /// This is needed for or patterns where one of the branches can be linted, but another can not
+ /// be.
+ ///
+ /// e.g. `m!(x) | Foo::Bar(ref x)`
+ ref_locals: FxIndexMap<HirId, Option<RefPat>>,
+}
+
+struct StateData {
+ /// Span of the top level expression
+ span: Span,
- count: u32,
+}
+
+enum State {
+ // Any number of deref method calls.
+ DerefMethod {
+ // The number of calls in a sequence which changed the referenced type
+ ty_changed_count: usize,
+ is_final_ufcs: bool,
++ /// The required mutability
++ target_mut: Mutability,
+ },
+ DerefedBorrow {
- },
- StateData {
- span: expr.span,
++ count: usize,
++ required_precedence: i8,
++ msg: &'static str,
+ },
+}
+
+// A reference operation considered by this lint pass
+enum RefOp {
+ Method(Mutability),
+ Deref,
+ AddrOf,
+}
+
+struct RefPat {
+ /// Whether every usage of the binding is dereferenced.
+ always_deref: bool,
+ /// The spans of all the ref bindings for this local.
+ spans: Vec<Span>,
+ /// The applicability of this suggestion.
+ app: Applicability,
+ /// All the replacements which need to be made.
+ replacements: Vec<(Span, String)>,
+}
+
+impl<'tcx> LateLintPass<'tcx> for Dereferencing {
+ #[allow(clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // Skip path expressions from deref calls. e.g. `Deref::deref(e)`
+ if Some(expr.hir_id) == self.skip_expr.take() {
+ return;
+ }
+
+ if let Some(local) = path_to_local(expr) {
+ self.check_local_usage(cx, expr, local);
+ }
+
+ // Stop processing sub expressions when a macro call is seen
+ if expr.span.from_expansion() {
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ }
+
+ let typeck = cx.typeck_results();
+ let (kind, sub_expr) = if let Some(x) = try_parse_ref_op(cx.tcx, typeck, expr) {
+ x
+ } else {
+ // The whole chain of reference operations has been seen
+ if let Some((state, data)) = self.state.take() {
+ report(cx, expr, state, data);
+ }
+ return;
+ };
+
+ match (self.state.take(), kind) {
+ (None, kind) => {
+ let parent = get_parent_node(cx.tcx, expr.hir_id);
+ let expr_ty = typeck.expr_ty(expr);
+
+ match kind {
+ RefOp::Method(target_mut)
+ if !is_lint_allowed(cx, EXPLICIT_DEREF_METHODS, expr.hir_id)
+ && is_linted_explicit_deref_position(parent, expr.hir_id, expr.span) =>
+ {
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count: if deref_method_same_type(expr_ty, typeck.expr_ty(sub_expr)) {
+ 0
+ } else {
+ 1
+ },
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
- if let Some((i, adjust)) = iter.by_ref().enumerate().find_map(|(i, adjust)| {
- if !matches!(adjust.kind, Adjust::Deref(_)) {
- Some((i, adjust))
- } else if !adjust.target.is_ref() {
- // Add one to the number of references found.
- Some((i + 1, adjust))
+ target_mut,
+ },
++ StateData { span: expr.span },
+ ));
+ },
+ RefOp::AddrOf => {
+ // Find the number of times the borrow is auto-derefed.
+ let mut iter = find_adjustments(cx.tcx, typeck, expr).iter();
- None
- }
- }) {
- // Found two consecutive derefs. At least one can be removed.
- if i > 1 {
- let target_mut = iter::once(adjust)
- .chain(iter)
- .find_map(|adjust| match adjust.kind {
- Adjust::Borrow(AutoBorrow::Ref(_, m)) => Some(m.into()),
- _ => None,
- })
- // This default should never happen. Auto-deref always reborrows.
- .unwrap_or(Mutability::Not);
- self.state = Some((
- // Subtract one for the current borrow expression, and one to cover the last
- // reference which can't be removed (it's either reborrowed, or needed for
- // auto-deref to happen).
- State::DerefedBorrow {
- count:
- // Truncation here would require more than a `u32::MAX` level reference. The compiler
- // does not support this.
- #[allow(clippy::cast_possible_truncation)]
- { i as u32 - 2 }
- },
- StateData {
- span: expr.span,
- target_mut,
- },
- ));
++ let mut deref_count = 0usize;
++ let next_adjust = loop {
++ match iter.next() {
++ Some(adjust) => {
++ if !matches!(adjust.kind, Adjust::Deref(_)) {
++ break Some(adjust);
++ } else if !adjust.target.is_ref() {
++ deref_count += 1;
++ break iter.next();
++ }
++ deref_count += 1;
++ },
++ None => break None,
++ };
++ };
++
++ // Determine the required number of references before any can be removed. In all cases the
++ // reference made by the current expression will be removed. After that there are four cases to
++ // handle.
++ //
++ // 1. Auto-borrow will trigger in the current position, so no further references are required.
++ // 2. Auto-deref ends at a reference, or the underlying type, so one extra needs to be left to
++ // handle the automatically inserted re-borrow.
++ // 3. Auto-deref hits a user-defined `Deref` impl, so at least one reference needs to exist to
++ // start auto-deref.
++ // 4. If the chain of non-user-defined derefs ends with a mutable re-borrow, and re-borrow
++ // adjustments will not be inserted automatically, then leave one further reference to avoid
++ // moving a mutable borrow.
++ // e.g.
++ // fn foo<T>(x: &mut Option<&mut T>, y: &mut T) {
++ // let x = match x {
++ // // Removing the borrow will cause `x` to be moved
++ // Some(x) => &mut *x,
++ // None => y
++ // };
++ // }
++ let deref_msg =
++ "this expression creates a reference which is immediately dereferenced by the compiler";
++ let borrow_msg = "this expression borrows a value the compiler would automatically borrow";
++
++ let (required_refs, required_precedence, msg) = if is_auto_borrow_position(parent, expr.hir_id)
++ {
++ (1, PREC_POSTFIX, if deref_count == 1 { borrow_msg } else { deref_msg })
++ } else if let Some(&Adjust::Borrow(AutoBorrow::Ref(_, mutability))) =
++ next_adjust.map(|a| &a.kind)
++ {
++ if matches!(mutability, AutoBorrowMutability::Mut { .. })
++ && !is_auto_reborrow_position(parent)
++ {
++ (3, 0, deref_msg)
+ } else {
- (Some((State::DerefMethod { ty_changed_count, .. }, data)), RefOp::Method(_)) => {
++ (2, 0, deref_msg)
+ }
++ } else {
++ (2, 0, deref_msg)
++ };
++
++ if deref_count >= required_refs {
++ self.state = Some((
++ State::DerefedBorrow {
++ // One of the required refs is for the current borrow expression, the remaining ones
++ // can't be removed without breaking the code. See earlier comment.
++ count: deref_count - required_refs,
++ required_precedence,
++ msg,
++ },
++ StateData { span: expr.span },
++ ));
+ }
+ },
+ _ => (),
+ }
+ },
- (Some((State::DerefedBorrow { count }, data)), RefOp::AddrOf) if count != 0 => {
- self.state = Some((State::DerefedBorrow { count: count - 1 }, data));
++ (
++ Some((
++ State::DerefMethod {
++ target_mut,
++ ty_changed_count,
++ ..
++ },
++ data,
++ )),
++ RefOp::Method(_),
++ ) => {
+ self.state = Some((
+ State::DerefMethod {
+ ty_changed_count: if deref_method_same_type(typeck.expr_ty(expr), typeck.expr_ty(sub_expr)) {
+ ty_changed_count
+ } else {
+ ty_changed_count + 1
+ },
+ is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
++ target_mut,
+ },
+ data,
+ ));
+ },
- if data.target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
++ (
++ Some((
++ State::DerefedBorrow {
++ count,
++ required_precedence,
++ msg,
++ },
++ data,
++ )),
++ RefOp::AddrOf,
++ ) if count != 0 => {
++ self.state = Some((
++ State::DerefedBorrow {
++ count: count - 1,
++ required_precedence,
++ msg,
++ },
++ data,
++ ));
+ },
+
+ (Some((state, data)), _) => report(cx, expr, state, data),
+ }
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ if let PatKind::Binding(BindingAnnotation::Ref, id, name, _) = pat.kind {
+ if let Some(opt_prev_pat) = self.ref_locals.get_mut(&id) {
+ // This binding id has been seen before. Add this pattern to the list of changes.
+ if let Some(prev_pat) = opt_prev_pat {
+ if pat.span.from_expansion() {
+ // Doesn't match the context of the previous pattern. Can't lint here.
+ *opt_prev_pat = None;
+ } else {
+ prev_pat.spans.push(pat.span);
+ prev_pat.replacements.push((
+ pat.span,
+ snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut prev_pat.app)
+ .0
+ .into(),
+ ));
+ }
+ }
+ return;
+ }
+
+ if_chain! {
+ if !pat.span.from_expansion();
+ if let ty::Ref(_, tam, _) = *cx.typeck_results().pat_ty(pat).kind();
+ // only lint immutable refs, because borrowed `&mut T` cannot be moved out
+ if let ty::Ref(_, _, Mutability::Not) = *tam.kind();
+ then {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, name.span, pat.span.ctxt(), "..", &mut app).0;
+ self.current_body = self.current_body.or(cx.enclosing_body);
+ self.ref_locals.insert(
+ id,
+ Some(RefPat {
+ always_deref: true,
+ spans: vec![pat.span],
+ app,
+ replacements: vec![(pat.span, snip.into())],
+ }),
+ );
+ }
+ }
+ }
+ }
+
+ fn check_body_post(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
+ if Some(body.id()) == self.current_body {
+ for pat in self.ref_locals.drain(..).filter_map(|(_, x)| x) {
+ let replacements = pat.replacements;
+ let app = pat.app;
+ span_lint_and_then(
+ cx,
+ if pat.always_deref {
+ NEEDLESS_BORROW
+ } else {
+ REF_BINDING_TO_REFERENCE
+ },
+ pat.spans,
+ "this pattern creates a reference to a reference",
+ |diag| {
+ diag.multipart_suggestion("try this", replacements, app);
+ },
+ );
+ }
+ self.current_body = None;
+ }
+ }
+}
+
+fn try_parse_ref_op<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ typeck: &'tcx TypeckResults<'_>,
+ expr: &'tcx Expr<'_>,
+) -> Option<(RefOp, &'tcx Expr<'tcx>)> {
+ let (def_id, arg) = match expr.kind {
+ ExprKind::MethodCall(_, [arg], _) => (typeck.type_dependent_def_id(expr.hir_id)?, arg),
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(path),
+ hir_id,
+ ..
+ },
+ [arg],
+ ) => (typeck.qpath_res(path, *hir_id).opt_def_id()?, arg),
+ ExprKind::Unary(UnOp::Deref, sub_expr) if !typeck.expr_ty(sub_expr).is_unsafe_ptr() => {
+ return Some((RefOp::Deref, sub_expr));
+ },
+ ExprKind::AddrOf(BorrowKind::Ref, _, sub_expr) => return Some((RefOp::AddrOf, sub_expr)),
+ _ => return None,
+ };
+ if tcx.is_diagnostic_item(sym::deref_method, def_id) {
+ Some((RefOp::Method(Mutability::Not), arg))
+ } else if tcx.trait_of_item(def_id)? == tcx.lang_items().deref_mut_trait()? {
+ Some((RefOp::Method(Mutability::Mut), arg))
+ } else {
+ None
+ }
+}
+
+// Checks whether the type for a deref call actually changed the type, not just the mutability of
+// the reference.
+fn deref_method_same_type(result_ty: Ty<'_>, arg_ty: Ty<'_>) -> bool {
+ match (result_ty.kind(), arg_ty.kind()) {
+ (ty::Ref(_, result_ty, _), ty::Ref(_, arg_ty, _)) => TyS::same_type(result_ty, arg_ty),
+
+ // The result type for a deref method is always a reference
+ // Not matching the previous pattern means the argument type is not a reference
+ // This means that the type did change
+ _ => false,
+ }
+}
+
+// Checks whether the parent node is a suitable context for switching from a deref method to the
+// deref operator.
+fn is_linted_explicit_deref_position(parent: Option<Node<'_>>, child_id: HirId, child_span: Span) -> bool {
+ let parent = match parent {
+ Some(Node::Expr(e)) if e.span.ctxt() == child_span.ctxt() => e,
+ _ => return true,
+ };
+ match parent.kind {
+ // Leave deref calls in the middle of a method chain.
+ // e.g. x.deref().foo()
+ ExprKind::MethodCall(_, [self_arg, ..], _) if self_arg.hir_id == child_id => false,
+
+ // Leave deref calls resulting in a called function
+ // e.g. (x.deref())()
+ ExprKind::Call(func_expr, _) if func_expr.hir_id == child_id => false,
+
+ // Makes an ugly suggestion
+ // e.g. *x.deref() => *&*x
+ ExprKind::Unary(UnOp::Deref, _)
+ // Postfix expressions would require parens
+ | ExprKind::Match(_, _, MatchSource::TryDesugar | MatchSource::AwaitDesugar)
+ | ExprKind::Field(..)
+ | ExprKind::Index(..)
+ | ExprKind::Err => false,
+
+ ExprKind::Box(..)
+ | ExprKind::ConstBlock(..)
+ | ExprKind::Array(_)
+ | ExprKind::Call(..)
+ | ExprKind::MethodCall(..)
+ | ExprKind::Tup(..)
+ | ExprKind::Binary(..)
+ | ExprKind::Unary(..)
+ | ExprKind::Lit(..)
+ | ExprKind::Cast(..)
+ | ExprKind::Type(..)
+ | ExprKind::DropTemps(..)
+ | ExprKind::If(..)
+ | ExprKind::Loop(..)
+ | ExprKind::Match(..)
+ | ExprKind::Let(..)
+ | ExprKind::Closure(..)
+ | ExprKind::Block(..)
+ | ExprKind::Assign(..)
+ | ExprKind::AssignOp(..)
+ | ExprKind::Path(..)
+ | ExprKind::AddrOf(..)
+ | ExprKind::Break(..)
+ | ExprKind::Continue(..)
+ | ExprKind::Ret(..)
+ | ExprKind::InlineAsm(..)
+ | ExprKind::Struct(..)
+ | ExprKind::Repeat(..)
+ | ExprKind::Yield(..) => true,
+ }
+}
+
++/// Checks if the given expression is in a position which can be auto-reborrowed.
++/// Note: This is only correct assuming auto-deref is already occurring.
++fn is_auto_reborrow_position(parent: Option<Node<'_>>) -> bool {
++ match parent {
++ Some(Node::Expr(parent)) => matches!(parent.kind, ExprKind::MethodCall(..) | ExprKind::Call(..)),
++ Some(Node::Local(_)) => true,
++ _ => false,
++ }
++}
++
++/// Checks if the given expression is a position which can auto-borrow.
++fn is_auto_borrow_position(parent: Option<Node<'_>>, child_id: HirId) -> bool {
++ if let Some(Node::Expr(parent)) = parent {
++ match parent.kind {
++ ExprKind::MethodCall(_, [self_arg, ..], _) => self_arg.hir_id == child_id,
++ ExprKind::Field(..) => true,
++ ExprKind::Call(f, _) => f.hir_id == child_id,
++ _ => false,
++ }
++ } else {
++ false
++ }
++}
++
+/// Adjustments are sometimes made in the parent block rather than the expression itself.
+fn find_adjustments<'tcx>(
+ tcx: TyCtxt<'tcx>,
+ typeck: &'tcx TypeckResults<'_>,
+ expr: &'tcx Expr<'_>,
+) -> &'tcx [Adjustment<'tcx>] {
+ let map = tcx.hir();
+ let mut iter = map.parent_iter(expr.hir_id);
+ let mut prev = expr;
+
+ loop {
+ match typeck.expr_adjustments(prev) {
+ [] => (),
+ a => break a,
+ };
+
+ match iter.next().map(|(_, x)| x) {
+ Some(Node::Block(_)) => {
+ if let Some((_, Node::Expr(e))) = iter.next() {
+ prev = e;
+ } else {
+ // This shouldn't happen. Blocks are always contained in an expression.
+ break &[];
+ }
+ },
+ Some(Node::Expr(&Expr {
+ kind: ExprKind::Break(Destination { target_id: Ok(id), .. }, _),
+ ..
+ })) => {
+ if let Some(Node::Expr(e)) = map.find(id) {
+ prev = e;
+ iter = map.parent_iter(id);
+ } else {
+ // This shouldn't happen. The destination should exist.
+ break &[];
+ }
+ },
+ _ => break &[],
+ }
+ }
+}
+
+#[allow(clippy::needless_pass_by_value)]
+fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData) {
+ match state {
+ State::DerefMethod {
+ ty_changed_count,
+ is_final_ufcs,
++ target_mut,
+ } => {
+ let mut app = Applicability::MachineApplicable;
+ let (expr_str, expr_is_macro_call) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
+ let ty = cx.typeck_results().expr_ty(expr);
+ let (_, ref_count) = peel_mid_ty_refs(ty);
+ let deref_str = if ty_changed_count >= ref_count && ref_count != 0 {
+ // a deref call changing &T -> &U requires two deref operators the first time
+ // this occurs. One to remove the reference, a second to call the deref impl.
+ "*".repeat(ty_changed_count + 1)
+ } else {
+ "*".repeat(ty_changed_count)
+ };
+ let addr_of_str = if ty_changed_count < ref_count {
+ // Check if a reborrow from &mut T -> &T is required.
- } else if data.target_mut == Mutability::Mut {
++ if target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
+ "&*"
+ } else {
+ ""
+ }
- match data.target_mut {
++ } else if target_mut == Mutability::Mut {
+ "&mut "
+ } else {
+ "&"
+ };
+
+ let expr_str = if !expr_is_macro_call && is_final_ufcs && expr.precedence().order() < PREC_PREFIX {
+ format!("({})", expr_str)
+ } else {
+ expr_str.into_owned()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ EXPLICIT_DEREF_METHODS,
+ data.span,
- State::DerefedBorrow { .. } => {
++ match target_mut {
+ Mutability::Not => "explicit `deref` method call",
+ Mutability::Mut => "explicit `deref_mut` method call",
+ },
+ "try this",
+ format!("{}{}{}", addr_of_str, deref_str, expr_str),
+ app,
+ );
+ },
- &format!(
- "this expression borrows a reference (`{}`) that is immediately dereferenced by the compiler",
- cx.typeck_results().expr_ty(expr),
- ),
++ State::DerefedBorrow {
++ required_precedence,
++ msg,
++ ..
++ } => {
+ let mut app = Applicability::MachineApplicable;
+ let snip = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app).0;
+ span_lint_and_sugg(
+ cx,
+ NEEDLESS_BORROW,
+ data.span,
- snip.into(),
++ msg,
+ "change this to",
++ if required_precedence > expr.precedence().order() && !has_enclosing_paren(&snip) {
++ format!("({})", snip)
++ } else {
++ snip.into()
++ },
+ app,
+ );
+ },
+ }
+}
+
+impl Dereferencing {
+ fn check_local_usage(&mut self, cx: &LateContext<'_>, e: &Expr<'_>, local: HirId) {
+ if let Some(outer_pat) = self.ref_locals.get_mut(&local) {
+ if let Some(pat) = outer_pat {
+ // Check for auto-deref
+ if !matches!(
+ cx.typeck_results().expr_adjustments(e),
+ [
+ Adjustment {
+ kind: Adjust::Deref(_),
+ ..
+ },
+ Adjustment {
+ kind: Adjust::Deref(_),
+ ..
+ },
+ ..
+ ]
+ ) {
+ match get_parent_expr(cx, e) {
+ // Field accesses are the same no matter the number of references.
+ Some(Expr {
+ kind: ExprKind::Field(..),
+ ..
+ }) => (),
+ Some(&Expr {
+ span,
+ kind: ExprKind::Unary(UnOp::Deref, _),
+ ..
+ }) if !span.from_expansion() => {
+ // Remove explicit deref.
+ let snip = snippet_with_context(cx, e.span, span.ctxt(), "..", &mut pat.app).0;
+ pat.replacements.push((span, snip.into()));
+ },
+ Some(parent) if !parent.span.from_expansion() => {
+ // Double reference might be needed at this point.
+ if parent.precedence().order() == PREC_POSTFIX {
+ // Parentheses would be needed here, don't lint.
+ *outer_pat = None;
+ } else {
+ pat.always_deref = false;
+ let snip = snippet_with_context(cx, e.span, parent.span.ctxt(), "..", &mut pat.app).0;
+ pat.replacements.push((e.span, format!("&{}", snip)));
+ }
+ },
+ _ if !e.span.from_expansion() => {
+ // Double reference might be needed at this point.
+ pat.always_deref = false;
+ let snip = snippet_with_applicability(cx, e.span, "..", &mut pat.app);
+ pat.replacements.push((e.span, format!("&{}", snip)));
+ },
+ // Edge case for macros. The span of the identifier will usually match the context of the
+ // binding, but not if the identifier was created in a macro. e.g. `concat_idents` and proc
+ // macros
+ _ => *outer_pat = None,
+ }
+ }
+ }
+ }
+ }
+}
--- /dev/null
+//! lint on enum variants that are prefixed or suffixed by the same characters
+
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::source::is_present_in_source;
+use clippy_utils::str_utils::{camel_case_split, count_match_end, count_match_start};
+use rustc_hir::{EnumDef, Item, ItemKind, Variant};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Span;
+use rustc_span::symbol::Symbol;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects enumeration variants that are prefixed or suffixed
+ /// by the same characters.
+ ///
+ /// ### Why is this bad?
+ /// Enumeration variant names should specify their variant,
+ /// not repeat the enumeration name.
+ ///
+ /// ### Limitations
+ /// Characters with no casing will be considered when comparing prefixes/suffixes
+ /// This applies to numbers and non-ascii characters without casing
+ /// e.g. `Foo1` and `Foo2` is considered to have different prefixes
+ /// (the prefixes are `Foo1` and `Foo2` respectively), as also `Bar螃`, `Bar蟹`
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Cake {
+ /// BlackForestCake,
+ /// HummingbirdCake,
+ /// BattenbergCake,
+ /// }
+ /// ```
+ /// Could be written as:
+ /// ```rust
+ /// enum Cake {
+ /// BlackForest,
+ /// Hummingbird,
+ /// Battenberg,
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ENUM_VARIANT_NAMES,
+ style,
+ "enums where all variants share a prefix/postfix"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Detects type names that are prefixed or suffixed by the
+ /// containing module's name.
+ ///
+ /// ### Why is this bad?
+ /// It requires the user to type the module name twice.
+ ///
+ /// ### Example
+ /// ```rust
+ /// mod cake {
+ /// struct BlackForestCake;
+ /// }
+ /// ```
+ /// Could be written as:
+ /// ```rust
+ /// mod cake {
+ /// struct BlackForest;
+ /// }
+ /// ```
+ #[clippy::version = "1.33.0"]
+ pub MODULE_NAME_REPETITIONS,
+ pedantic,
+ "type names prefixed/postfixed with their containing module's name"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for modules that have the same name as their
+ /// parent module
+ ///
+ /// ### Why is this bad?
+ /// A typical beginner mistake is to have `mod foo;` and
+ /// again `mod foo { ..
+ /// }` in `foo.rs`.
+ /// The expectation is that items inside the inner `mod foo { .. }` are then
+ /// available
+ /// through `foo::x`, but they are only available through
+ /// `foo::foo::x`.
+ /// If this is done on purpose, it would be better to choose a more
+ /// representative module name.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // lib.rs
+ /// mod foo;
+ /// // foo.rs
+ /// mod foo {
+ /// ...
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MODULE_INCEPTION,
+ style,
+ "modules that have the same name as their parent module"
+}
+
+pub struct EnumVariantNames {
+ modules: Vec<(Symbol, String)>,
+ threshold: u64,
+ avoid_breaking_exported_api: bool,
+}
+
+impl EnumVariantNames {
+ #[must_use]
+ pub fn new(threshold: u64, avoid_breaking_exported_api: bool) -> Self {
+ Self {
+ modules: Vec::new(),
+ threshold,
+ avoid_breaking_exported_api,
+ }
+ }
+}
+
+impl_lint_pass!(EnumVariantNames => [
+ ENUM_VARIANT_NAMES,
+ MODULE_NAME_REPETITIONS,
+ MODULE_INCEPTION
+]);
+
+fn check_enum_start(cx: &LateContext<'_>, item_name: &str, variant: &Variant<'_>) {
+ let name = variant.ident.name.as_str();
+ let item_name_chars = item_name.chars().count();
+
+ if count_match_start(item_name, name).char_count == item_name_chars
+ && name.chars().nth(item_name_chars).map_or(false, |c| !c.is_lowercase())
+ && name.chars().nth(item_name_chars + 1).map_or(false, |c| !c.is_numeric())
+ {
+ span_lint(
+ cx,
+ ENUM_VARIANT_NAMES,
+ variant.span,
+ "variant name starts with the enum's name",
+ );
+ }
+}
+
+fn check_enum_end(cx: &LateContext<'_>, item_name: &str, variant: &Variant<'_>) {
+ let name = variant.ident.name.as_str();
+ let item_name_chars = item_name.chars().count();
+
+ if count_match_end(item_name, name).char_count == item_name_chars {
+ span_lint(
+ cx,
+ ENUM_VARIANT_NAMES,
+ variant.span,
+ "variant name ends with the enum's name",
+ );
+ }
+}
+
+fn check_variant(cx: &LateContext<'_>, threshold: u64, def: &EnumDef<'_>, item_name: &str, span: Span) {
+ if (def.variants.len() as u64) < threshold {
+ return;
+ }
+
+ let first = &def.variants[0].ident.name.as_str();
+ let mut pre = camel_case_split(first);
+ let mut post = pre.clone();
+ post.reverse();
+ for var in def.variants {
+ check_enum_start(cx, item_name, var);
+ check_enum_end(cx, item_name, var);
+ let name = var.ident.name.as_str();
+
+ let variant_split = camel_case_split(name);
++ if variant_split.len() == 1 {
++ return;
++ }
+
+ pre = pre
+ .iter()
+ .zip(variant_split.iter())
+ .take_while(|(a, b)| a == b)
+ .map(|e| *e.0)
+ .collect();
+ post = post
+ .iter()
+ .zip(variant_split.iter().rev())
+ .take_while(|(a, b)| a == b)
+ .map(|e| *e.0)
+ .collect();
+ }
+ let (what, value) = match (pre.is_empty(), post.is_empty()) {
+ (true, true) => return,
+ (false, _) => ("pre", pre.join("")),
+ (true, false) => {
+ post.reverse();
+ ("post", post.join(""))
+ },
+ };
+ span_lint_and_help(
+ cx,
+ ENUM_VARIANT_NAMES,
+ span,
+ &format!("all variants have the same {}fix: `{}`", what, value),
+ None,
+ &format!(
+ "remove the {}fixes and use full paths to \
+ the variants instead of glob imports",
+ what
+ ),
+ );
+}
+
+#[must_use]
+fn to_camel_case(item_name: &str) -> String {
+ let mut s = String::new();
+ let mut up = true;
+ for c in item_name.chars() {
+ if c.is_uppercase() {
+ // we only turn snake case text into CamelCase
+ return item_name.to_string();
+ }
+ if c == '_' {
+ up = true;
+ continue;
+ }
+ if up {
+ up = false;
+ s.extend(c.to_uppercase());
+ } else {
+ s.push(c);
+ }
+ }
+ s
+}
+
+impl LateLintPass<'_> for EnumVariantNames {
+ fn check_item_post(&mut self, _cx: &LateContext<'_>, _item: &Item<'_>) {
+ let last = self.modules.pop();
+ assert!(last.is_some());
+ }
+
+ #[allow(clippy::similar_names)]
+ fn check_item(&mut self, cx: &LateContext<'_>, item: &Item<'_>) {
+ let item_name = item.ident.name.as_str();
+ let item_camel = to_camel_case(item_name);
+ if !item.span.from_expansion() && is_present_in_source(cx, item.span) {
+ if let Some(&(ref mod_name, ref mod_camel)) = self.modules.last() {
+ // constants don't have surrounding modules
+ if !mod_camel.is_empty() {
+ if mod_name == &item.ident.name {
+ if let ItemKind::Mod(..) = item.kind {
+ span_lint(
+ cx,
+ MODULE_INCEPTION,
+ item.span,
+ "module has the same name as its containing module",
+ );
+ }
+ }
+ // The `module_name_repetitions` lint should only trigger if the item has the module in its
+ // name. Having the same name is accepted.
+ if item.vis.node.is_pub() && item_camel.len() > mod_camel.len() {
+ let matching = count_match_start(mod_camel, &item_camel);
+ let rmatching = count_match_end(mod_camel, &item_camel);
+ let nchars = mod_camel.chars().count();
+
+ let is_word_beginning = |c: char| c == '_' || c.is_uppercase() || c.is_numeric();
+
+ if matching.char_count == nchars {
+ match item_camel.chars().nth(nchars) {
+ Some(c) if is_word_beginning(c) => span_lint(
+ cx,
+ MODULE_NAME_REPETITIONS,
+ item.span,
+ "item name starts with its containing module's name",
+ ),
+ _ => (),
+ }
+ }
+ if rmatching.char_count == nchars {
+ span_lint(
+ cx,
+ MODULE_NAME_REPETITIONS,
+ item.span,
+ "item name ends with its containing module's name",
+ );
+ }
+ }
+ }
+ }
+ }
+ if let ItemKind::Enum(ref def, _) = item.kind {
+ if !(self.avoid_breaking_exported_api && cx.access_levels.is_exported(item.def_id)) {
+ check_variant(cx, self.threshold, def, item_name, item.span);
+ }
+ }
+ self.modules.push((item.ident.name, item_camel));
+ }
+}
--- /dev/null
- use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind};
+use clippy_utils::diagnostics::{multispan_sugg, span_lint, span_lint_and_then};
++use clippy_utils::get_enclosing_block;
+use clippy_utils::macros::{find_assert_eq_args, first_node_macro_backtrace};
+use clippy_utils::source::snippet;
+use clippy_utils::ty::{implements_trait, is_copy};
+use clippy_utils::{ast_utils::is_useless_with_eq_exprs, eq_expr_value, is_in_test_function};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
++use rustc_hir::{
++ def::Res, def_id::DefId, BinOpKind, BorrowKind, Expr, ExprKind, GenericArg, ItemKind, QPath, Ty, TyKind,
++};
+use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::ty::{self, TyS};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for equal operands to comparison, logical and
+ /// bitwise, difference and division binary operators (`==`, `>`, etc., `&&`,
+ /// `||`, `&`, `|`, `^`, `-` and `/`).
+ ///
+ /// ### Why is this bad?
+ /// This is usually just a typo or a copy and paste error.
+ ///
+ /// ### Known problems
+ /// False negatives: We had some false positives regarding
+ /// calls (notably [racer](https://github.com/phildawes/racer) had one instance
+ /// of `x.pop() && x.pop()`), so we removed matching any function or method
+ /// calls. We may introduce a list of known pure functions in the future.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = 1;
+ /// if x + 1 == x + 1 {}
+ /// ```
+ /// or
+ /// ```rust
+ /// # let a = 3;
+ /// # let b = 4;
+ /// assert_eq!(a, a);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EQ_OP,
+ correctness,
+ "equal operands on both sides of a comparison or bitwise combination (e.g., `x == x`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arguments to `==` which have their address
+ /// taken to satisfy a bound
+ /// and suggests to dereference the other argument instead
+ ///
+ /// ### Why is this bad?
+ /// It is more idiomatic to dereference the other argument.
+ ///
+ /// ### Known problems
+ /// None
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // Bad
+ /// &x == y
+ ///
+ /// // Good
+ /// x == *y
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OP_REF,
+ style,
+ "taking a reference to satisfy the type constraints on `==`"
+}
+
+declare_lint_pass!(EqOp => [EQ_OP, OP_REF]);
+
+impl<'tcx> LateLintPass<'tcx> for EqOp {
+ #[allow(clippy::similar_names, clippy::too_many_lines)]
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) {
+ if_chain! {
+ if let Some((macro_call, macro_name)) = first_node_macro_backtrace(cx, e).find_map(|macro_call| {
+ let name = cx.tcx.item_name(macro_call.def_id);
+ matches!(name.as_str(), "assert_eq" | "assert_ne" | "debug_assert_eq" | "debug_assert_ne")
+ .then(|| (macro_call, name))
+ });
+ if let Some((lhs, rhs, _)) = find_assert_eq_args(cx, e, macro_call.expn);
+ if eq_expr_value(cx, lhs, rhs);
+ if macro_call.is_local();
+ if !is_in_test_function(cx.tcx, e.hir_id);
+ then {
+ span_lint(
+ cx,
+ EQ_OP,
+ lhs.span.to(rhs.span),
+ &format!("identical args used in this `{}!` macro call", macro_name),
+ );
+ }
+ }
+ if let ExprKind::Binary(op, left, right) = e.kind {
+ if e.span.from_expansion() {
+ return;
+ }
+ let macro_with_not_op = |expr_kind: &ExprKind<'_>| {
+ if let ExprKind::Unary(_, expr) = *expr_kind {
+ expr.span.from_expansion()
+ } else {
+ false
+ }
+ };
+ if macro_with_not_op(&left.kind) || macro_with_not_op(&right.kind) {
+ return;
+ }
+ if is_useless_with_eq_exprs(op.node.into())
+ && eq_expr_value(cx, left, right)
+ && !is_in_test_function(cx.tcx, e.hir_id)
+ {
+ span_lint(
+ cx,
+ EQ_OP,
+ e.span,
+ &format!("equal expressions as operands to `{}`", op.node.as_str()),
+ );
+ return;
+ }
+ let (trait_id, requires_ref) = match op.node {
+ BinOpKind::Add => (cx.tcx.lang_items().add_trait(), false),
+ BinOpKind::Sub => (cx.tcx.lang_items().sub_trait(), false),
+ BinOpKind::Mul => (cx.tcx.lang_items().mul_trait(), false),
+ BinOpKind::Div => (cx.tcx.lang_items().div_trait(), false),
+ BinOpKind::Rem => (cx.tcx.lang_items().rem_trait(), false),
+ // don't lint short circuiting ops
+ BinOpKind::And | BinOpKind::Or => return,
+ BinOpKind::BitXor => (cx.tcx.lang_items().bitxor_trait(), false),
+ BinOpKind::BitAnd => (cx.tcx.lang_items().bitand_trait(), false),
+ BinOpKind::BitOr => (cx.tcx.lang_items().bitor_trait(), false),
+ BinOpKind::Shl => (cx.tcx.lang_items().shl_trait(), false),
+ BinOpKind::Shr => (cx.tcx.lang_items().shr_trait(), false),
+ BinOpKind::Ne | BinOpKind::Eq => (cx.tcx.lang_items().eq_trait(), true),
+ BinOpKind::Lt | BinOpKind::Le | BinOpKind::Ge | BinOpKind::Gt => {
+ (cx.tcx.lang_items().partial_ord_trait(), true)
+ },
+ };
+ if let Some(trait_id) = trait_id {
+ #[allow(clippy::match_same_arms)]
+ match (&left.kind, &right.kind) {
+ // do not suggest to dereference literals
+ (&ExprKind::Lit(..), _) | (_, &ExprKind::Lit(..)) => {},
+ // &foo == &bar
+ (&ExprKind::AddrOf(BorrowKind::Ref, _, l), &ExprKind::AddrOf(BorrowKind::Ref, _, r)) => {
+ let lty = cx.typeck_results().expr_ty(l);
+ let rty = cx.typeck_results().expr_ty(r);
+ let lcpy = is_copy(cx, lty);
+ let rcpy = is_copy(cx, rty);
++ if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
++ if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
++ || (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
++ {
++ return; // Don't lint
++ }
++ }
+ // either operator autorefs or both args are copyable
+ if (requires_ref || (lcpy && rcpy)) && implements_trait(cx, lty, trait_id, &[rty.into()]) {
+ span_lint_and_then(
+ cx,
+ OP_REF,
+ e.span,
+ "needlessly taken reference of both operands",
+ |diag| {
+ let lsnip = snippet(cx, l.span, "...").to_string();
+ let rsnip = snippet(cx, r.span, "...").to_string();
+ multispan_sugg(
+ diag,
+ "use the values directly",
+ vec![(left.span, lsnip), (right.span, rsnip)],
+ );
+ },
+ );
+ } else if lcpy
+ && !rcpy
+ && implements_trait(cx, lty, trait_id, &[cx.typeck_results().expr_ty(right).into()])
+ {
+ span_lint_and_then(
+ cx,
+ OP_REF,
+ e.span,
+ "needlessly taken reference of left operand",
+ |diag| {
+ let lsnip = snippet(cx, l.span, "...").to_string();
+ diag.span_suggestion(
+ left.span,
+ "use the left value directly",
+ lsnip,
+ Applicability::MaybeIncorrect, // FIXME #2597
+ );
+ },
+ );
+ } else if !lcpy
+ && rcpy
+ && implements_trait(cx, cx.typeck_results().expr_ty(left), trait_id, &[rty.into()])
+ {
+ span_lint_and_then(
+ cx,
+ OP_REF,
+ e.span,
+ "needlessly taken reference of right operand",
+ |diag| {
+ let rsnip = snippet(cx, r.span, "...").to_string();
+ diag.span_suggestion(
+ right.span,
+ "use the right value directly",
+ rsnip,
+ Applicability::MaybeIncorrect, // FIXME #2597
+ );
+ },
+ );
+ }
+ },
+ // &foo == bar
+ (&ExprKind::AddrOf(BorrowKind::Ref, _, l), _) => {
+ let lty = cx.typeck_results().expr_ty(l);
++ if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
++ let rty = cx.typeck_results().expr_ty(right);
++ if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
++ || (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
++ {
++ return; // Don't lint
++ }
++ }
+ let lcpy = is_copy(cx, lty);
+ if (requires_ref || lcpy)
+ && implements_trait(cx, lty, trait_id, &[cx.typeck_results().expr_ty(right).into()])
+ {
+ span_lint_and_then(
+ cx,
+ OP_REF,
+ e.span,
+ "needlessly taken reference of left operand",
+ |diag| {
+ let lsnip = snippet(cx, l.span, "...").to_string();
+ diag.span_suggestion(
+ left.span,
+ "use the left value directly",
+ lsnip,
+ Applicability::MaybeIncorrect, // FIXME #2597
+ );
+ },
+ );
+ }
+ },
+ // foo == &bar
+ (_, &ExprKind::AddrOf(BorrowKind::Ref, _, r)) => {
+ let rty = cx.typeck_results().expr_ty(r);
++ if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
++ let lty = cx.typeck_results().expr_ty(left);
++ if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
++ || (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
++ {
++ return; // Don't lint
++ }
++ }
+ let rcpy = is_copy(cx, rty);
+ if (requires_ref || rcpy)
+ && implements_trait(cx, cx.typeck_results().expr_ty(left), trait_id, &[rty.into()])
+ {
+ span_lint_and_then(cx, OP_REF, e.span, "taken reference of right operand", |diag| {
+ let rsnip = snippet(cx, r.span, "...").to_string();
+ diag.span_suggestion(
+ right.span,
+ "use the right value directly",
+ rsnip,
+ Applicability::MaybeIncorrect, // FIXME #2597
+ );
+ });
+ }
+ },
+ _ => {},
+ }
+ }
+ }
+ }
+}
++
++fn in_impl<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, bin_op: DefId) -> Option<(&'tcx Ty<'tcx>, &'tcx Ty<'tcx>)> {
++ if_chain! {
++ if let Some(block) = get_enclosing_block(cx, e.hir_id);
++ if let Some(impl_def_id) = cx.tcx.impl_of_method(block.hir_id.owner.to_def_id());
++ let item = cx.tcx.hir().expect_item(impl_def_id.expect_local());
++ if let ItemKind::Impl(item) = &item.kind;
++ if let Some(of_trait) = &item.of_trait;
++ if let Some(seg) = of_trait.path.segments.last();
++ if let Some(Res::Def(_, trait_id)) = seg.res;
++ if trait_id == bin_op;
++ if let Some(generic_args) = seg.args;
++ if let Some(GenericArg::Type(other_ty)) = generic_args.args.last();
++
++ then {
++ Some((item.self_ty, other_ty))
++ }
++ else {
++ None
++ }
++ }
++}
++
++fn are_equal<'tcx>(cx: &LateContext<'tcx>, middle_ty: &TyS<'_>, hir_ty: &Ty<'_>) -> bool {
++ if_chain! {
++ if let ty::Adt(adt_def, _) = middle_ty.kind();
++ if let Some(local_did) = adt_def.did.as_local();
++ let item = cx.tcx.hir().expect_item(local_did);
++ let middle_ty_id = item.def_id.to_def_id();
++ if let TyKind::Path(QPath::Resolved(_, path)) = hir_ty.kind;
++ if let Res::Def(_, hir_ty_id) = path.res;
++
++ then {
++ hir_ty_id == middle_ty_id
++ }
++ else {
++ false
++ }
++ }
++}
--- /dev/null
- Some(item.span.lo() + BytePos((i + (&snip[i..]).find('(')?) as u32))
+use std::borrow::Cow;
+use std::collections::BTreeMap;
+
+use rustc_errors::DiagnosticBuilder;
+use rustc_hir as hir;
+use rustc_hir::intravisit::{walk_body, walk_expr, walk_inf, walk_ty, Visitor};
+use rustc_hir::{Body, Expr, ExprKind, GenericArg, Item, ItemKind, QPath, TyKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::hir::nested_filter;
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{Ty, TyS, TypeckResults};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::symbol::sym;
+use rustc_typeck::hir_ty_to_ty;
+
+use if_chain::if_chain;
+
+use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
+use clippy_utils::differing_macro_contexts;
+use clippy_utils::source::{snippet, snippet_opt};
+use clippy_utils::ty::is_type_diagnostic_item;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for public `impl` or `fn` missing generalization
+ /// over different hashers and implicitly defaulting to the default hashing
+ /// algorithm (`SipHash`).
+ ///
+ /// ### Why is this bad?
+ /// `HashMap` or `HashSet` with custom hashers cannot be
+ /// used with them.
+ ///
+ /// ### Known problems
+ /// Suggestions for replacing constructors can contain
+ /// false-positives. Also applying suggestions can require modification of other
+ /// pieces of code, possibly including external crates.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashMap;
+ /// # use std::hash::{Hash, BuildHasher};
+ /// # trait Serialize {};
+ /// impl<K: Hash + Eq, V> Serialize for HashMap<K, V> { }
+ ///
+ /// pub fn foo(map: &mut HashMap<i32, i32>) { }
+ /// ```
+ /// could be rewritten as
+ /// ```rust
+ /// # use std::collections::HashMap;
+ /// # use std::hash::{Hash, BuildHasher};
+ /// # trait Serialize {};
+ /// impl<K: Hash + Eq, V, S: BuildHasher> Serialize for HashMap<K, V, S> { }
+ ///
+ /// pub fn foo<S: BuildHasher>(map: &mut HashMap<i32, i32, S>) { }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub IMPLICIT_HASHER,
+ pedantic,
+ "missing generalization over different hashers"
+}
+
+declare_lint_pass!(ImplicitHasher => [IMPLICIT_HASHER]);
+
+impl<'tcx> LateLintPass<'tcx> for ImplicitHasher {
+ #[allow(clippy::cast_possible_truncation, clippy::too_many_lines)]
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ use rustc_span::BytePos;
+
+ fn suggestion<'tcx>(
+ cx: &LateContext<'tcx>,
+ diag: &mut DiagnosticBuilder<'_>,
+ generics_span: Span,
+ generics_suggestion_span: Span,
+ target: &ImplicitHasherType<'_>,
+ vis: ImplicitHasherConstructorVisitor<'_, '_, '_>,
+ ) {
+ let generics_snip = snippet(cx, generics_span, "");
+ // trim `<` `>`
+ let generics_snip = if generics_snip.is_empty() {
+ ""
+ } else {
+ &generics_snip[1..generics_snip.len() - 1]
+ };
+
+ multispan_sugg(
+ diag,
+ "consider adding a type parameter",
+ vec![
+ (
+ generics_suggestion_span,
+ format!(
+ "<{}{}S: ::std::hash::BuildHasher{}>",
+ generics_snip,
+ if generics_snip.is_empty() { "" } else { ", " },
+ if vis.suggestions.is_empty() {
+ ""
+ } else {
+ // request users to add `Default` bound so that generic constructors can be used
+ " + Default"
+ },
+ ),
+ ),
+ (
+ target.span(),
+ format!("{}<{}, S>", target.type_name(), target.type_arguments(),),
+ ),
+ ],
+ );
+
+ if !vis.suggestions.is_empty() {
+ multispan_sugg(diag, "...and use generic constructor", vis.suggestions);
+ }
+ }
+
+ if !cx.access_levels.is_exported(item.def_id) {
+ return;
+ }
+
+ match item.kind {
+ ItemKind::Impl(ref impl_) => {
+ let mut vis = ImplicitHasherTypeVisitor::new(cx);
+ vis.visit_ty(impl_.self_ty);
+
+ for target in &vis.found {
+ if differing_macro_contexts(item.span, target.span()) {
+ return;
+ }
+
+ let generics_suggestion_span = impl_.generics.span.substitute_dummy({
+ let pos = snippet_opt(cx, item.span.until(target.span()))
+ .and_then(|snip| Some(item.span.lo() + BytePos(snip.find("impl")? as u32 + 4)));
+ if let Some(pos) = pos {
+ Span::new(pos, pos, item.span.ctxt(), item.span.parent())
+ } else {
+ return;
+ }
+ });
+
+ let mut ctr_vis = ImplicitHasherConstructorVisitor::new(cx, target);
+ for item in impl_.items.iter().map(|item| cx.tcx.hir().impl_item(item.id)) {
+ ctr_vis.visit_impl_item(item);
+ }
+
+ span_lint_and_then(
+ cx,
+ IMPLICIT_HASHER,
+ target.span(),
+ &format!(
+ "impl for `{}` should be generalized over different hashers",
+ target.type_name()
+ ),
+ move |diag| {
+ suggestion(cx, diag, impl_.generics.span, generics_suggestion_span, target, ctr_vis);
+ },
+ );
+ }
+ },
+ ItemKind::Fn(ref sig, ref generics, body_id) => {
+ let body = cx.tcx.hir().body(body_id);
+
+ for ty in sig.decl.inputs {
+ let mut vis = ImplicitHasherTypeVisitor::new(cx);
+ vis.visit_ty(ty);
+
+ for target in &vis.found {
+ if in_external_macro(cx.sess(), generics.span) {
+ continue;
+ }
+ let generics_suggestion_span = generics.span.substitute_dummy({
+ let pos = snippet_opt(
+ cx,
+ Span::new(
+ item.span.lo(),
+ body.params[0].pat.span.lo(),
+ item.span.ctxt(),
+ item.span.parent(),
+ ),
+ )
+ .and_then(|snip| {
+ let i = snip.find("fn")?;
++ Some(item.span.lo() + BytePos((i + snip[i..].find('(')?) as u32))
+ })
+ .expect("failed to create span for type parameters");
+ Span::new(pos, pos, item.span.ctxt(), item.span.parent())
+ });
+
+ let mut ctr_vis = ImplicitHasherConstructorVisitor::new(cx, target);
+ ctr_vis.visit_body(body);
+
+ span_lint_and_then(
+ cx,
+ IMPLICIT_HASHER,
+ target.span(),
+ &format!(
+ "parameter of type `{}` should be generalized over different hashers",
+ target.type_name()
+ ),
+ move |diag| {
+ suggestion(cx, diag, generics.span, generics_suggestion_span, target, ctr_vis);
+ },
+ );
+ }
+ }
+ },
+ _ => {},
+ }
+ }
+}
+
+enum ImplicitHasherType<'tcx> {
+ HashMap(Span, Ty<'tcx>, Cow<'static, str>, Cow<'static, str>),
+ HashSet(Span, Ty<'tcx>, Cow<'static, str>),
+}
+
+impl<'tcx> ImplicitHasherType<'tcx> {
+ /// Checks that `ty` is a target type without a `BuildHasher`.
+ fn new(cx: &LateContext<'tcx>, hir_ty: &hir::Ty<'_>) -> Option<Self> {
+ if let TyKind::Path(QPath::Resolved(None, path)) = hir_ty.kind {
+ let params: Vec<_> = path
+ .segments
+ .last()
+ .as_ref()?
+ .args
+ .as_ref()?
+ .args
+ .iter()
+ .filter_map(|arg| match arg {
+ GenericArg::Type(ty) => Some(ty),
+ _ => None,
+ })
+ .collect();
+ let params_len = params.len();
+
+ let ty = hir_ty_to_ty(cx.tcx, hir_ty);
+
+ if is_type_diagnostic_item(cx, ty, sym::HashMap) && params_len == 2 {
+ Some(ImplicitHasherType::HashMap(
+ hir_ty.span,
+ ty,
+ snippet(cx, params[0].span, "K"),
+ snippet(cx, params[1].span, "V"),
+ ))
+ } else if is_type_diagnostic_item(cx, ty, sym::HashSet) && params_len == 1 {
+ Some(ImplicitHasherType::HashSet(
+ hir_ty.span,
+ ty,
+ snippet(cx, params[0].span, "T"),
+ ))
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ }
+
+ fn type_name(&self) -> &'static str {
+ match *self {
+ ImplicitHasherType::HashMap(..) => "HashMap",
+ ImplicitHasherType::HashSet(..) => "HashSet",
+ }
+ }
+
+ fn type_arguments(&self) -> String {
+ match *self {
+ ImplicitHasherType::HashMap(.., ref k, ref v) => format!("{}, {}", k, v),
+ ImplicitHasherType::HashSet(.., ref t) => format!("{}", t),
+ }
+ }
+
+ fn ty(&self) -> Ty<'tcx> {
+ match *self {
+ ImplicitHasherType::HashMap(_, ty, ..) | ImplicitHasherType::HashSet(_, ty, ..) => ty,
+ }
+ }
+
+ fn span(&self) -> Span {
+ match *self {
+ ImplicitHasherType::HashMap(span, ..) | ImplicitHasherType::HashSet(span, ..) => span,
+ }
+ }
+}
+
+struct ImplicitHasherTypeVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ found: Vec<ImplicitHasherType<'tcx>>,
+}
+
+impl<'a, 'tcx> ImplicitHasherTypeVisitor<'a, 'tcx> {
+ fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self { cx, found: vec![] }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for ImplicitHasherTypeVisitor<'a, 'tcx> {
+ fn visit_ty(&mut self, t: &'tcx hir::Ty<'_>) {
+ if let Some(target) = ImplicitHasherType::new(self.cx, t) {
+ self.found.push(target);
+ }
+
+ walk_ty(self, t);
+ }
+
+ fn visit_infer(&mut self, inf: &'tcx hir::InferArg) {
+ if let Some(target) = ImplicitHasherType::new(self.cx, &inf.to_ty()) {
+ self.found.push(target);
+ }
+
+ walk_inf(self, inf);
+ }
+}
+
+/// Looks for default-hasher-dependent constructors like `HashMap::new`.
+struct ImplicitHasherConstructorVisitor<'a, 'b, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ maybe_typeck_results: Option<&'tcx TypeckResults<'tcx>>,
+ target: &'b ImplicitHasherType<'tcx>,
+ suggestions: BTreeMap<Span, String>,
+}
+
+impl<'a, 'b, 'tcx> ImplicitHasherConstructorVisitor<'a, 'b, 'tcx> {
+ fn new(cx: &'a LateContext<'tcx>, target: &'b ImplicitHasherType<'tcx>) -> Self {
+ Self {
+ cx,
+ maybe_typeck_results: cx.maybe_typeck_results(),
+ target,
+ suggestions: BTreeMap::new(),
+ }
+ }
+}
+
+impl<'a, 'b, 'tcx> Visitor<'tcx> for ImplicitHasherConstructorVisitor<'a, 'b, 'tcx> {
+ type NestedFilter = nested_filter::OnlyBodies;
+
+ fn visit_body(&mut self, body: &'tcx Body<'_>) {
+ let old_maybe_typeck_results = self.maybe_typeck_results.replace(self.cx.tcx.typeck_body(body.id()));
+ walk_body(self, body);
+ self.maybe_typeck_results = old_maybe_typeck_results;
+ }
+
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if_chain! {
+ if let ExprKind::Call(fun, args) = e.kind;
+ if let ExprKind::Path(QPath::TypeRelative(ty, method)) = fun.kind;
+ if let TyKind::Path(QPath::Resolved(None, ty_path)) = ty.kind;
+ if let Some(ty_did) = ty_path.res.opt_def_id();
+ then {
+ if !TyS::same_type(self.target.ty(), self.maybe_typeck_results.unwrap().expr_ty(e)) {
+ return;
+ }
+
+ if self.cx.tcx.is_diagnostic_item(sym::HashMap, ty_did) {
+ if method.ident.name == sym::new {
+ self.suggestions
+ .insert(e.span, "HashMap::default()".to_string());
+ } else if method.ident.name == sym!(with_capacity) {
+ self.suggestions.insert(
+ e.span,
+ format!(
+ "HashMap::with_capacity_and_hasher({}, Default::default())",
+ snippet(self.cx, args[0].span, "capacity"),
+ ),
+ );
+ }
+ } else if self.cx.tcx.is_diagnostic_item(sym::HashSet, ty_did) {
+ if method.ident.name == sym::new {
+ self.suggestions
+ .insert(e.span, "HashSet::default()".to_string());
+ } else if method.ident.name == sym!(with_capacity) {
+ self.suggestions.insert(
+ e.span,
+ format!(
+ "HashSet::with_capacity_and_hasher({}, Default::default())",
+ snippet(self.cx, args[0].span, "capacity"),
+ ),
+ );
+ }
+ }
+ }
+ }
+
+ walk_expr(self, e);
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
--- /dev/null
- LintId::of(reference::REF_IN_DEREF),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::all", Some("clippy_all"), vec![
+ LintId::of(absurd_extreme_comparisons::ABSURD_EXTREME_COMPARISONS),
+ LintId::of(approx_const::APPROX_CONSTANT),
+ LintId::of(assertions_on_constants::ASSERTIONS_ON_CONSTANTS),
+ LintId::of(assign_ops::ASSIGN_OP_PATTERN),
+ LintId::of(assign_ops::MISREFACTORED_ASSIGN_OP),
+ LintId::of(async_yields_async::ASYNC_YIELDS_ASYNC),
+ LintId::of(attrs::BLANKET_CLIPPY_RESTRICTION_LINTS),
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(attrs::DEPRECATED_SEMVER),
+ LintId::of(attrs::MISMATCHED_TARGET_OS),
+ LintId::of(attrs::USELESS_ATTRIBUTE),
+ LintId::of(bit_mask::BAD_BIT_MASK),
+ LintId::of(bit_mask::INEFFECTIVE_BIT_MASK),
+ LintId::of(blacklisted_name::BLACKLISTED_NAME),
+ LintId::of(blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS),
+ LintId::of(bool_assert_comparison::BOOL_ASSERT_COMPARISON),
+ LintId::of(booleans::LOGIC_BUG),
+ LintId::of(booleans::NONMINIMAL_BOOL),
+ LintId::of(casts::CAST_REF_TO_MUT),
+ LintId::of(casts::CHAR_LIT_AS_U8),
+ LintId::of(casts::FN_TO_NUMERIC_CAST),
+ LintId::of(casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION),
+ LintId::of(casts::UNNECESSARY_CAST),
+ LintId::of(collapsible_if::COLLAPSIBLE_ELSE_IF),
+ LintId::of(collapsible_if::COLLAPSIBLE_IF),
+ LintId::of(collapsible_match::COLLAPSIBLE_MATCH),
+ LintId::of(comparison_chain::COMPARISON_CHAIN),
+ LintId::of(copies::IFS_SAME_COND),
+ LintId::of(copies::IF_SAME_THEN_ELSE),
+ LintId::of(default::FIELD_REASSIGN_WITH_DEFAULT),
+ LintId::of(dereference::NEEDLESS_BORROW),
+ LintId::of(derivable_impls::DERIVABLE_IMPLS),
+ LintId::of(derive::DERIVE_HASH_XOR_EQ),
+ LintId::of(derive::DERIVE_ORD_XOR_PARTIAL_ORD),
+ LintId::of(disallowed_methods::DISALLOWED_METHODS),
+ LintId::of(disallowed_types::DISALLOWED_TYPES),
+ LintId::of(doc::MISSING_SAFETY_DOC),
+ LintId::of(doc::NEEDLESS_DOCTEST_MAIN),
+ LintId::of(double_comparison::DOUBLE_COMPARISONS),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(drop_forget_ref::DROP_COPY),
+ LintId::of(drop_forget_ref::DROP_REF),
+ LintId::of(drop_forget_ref::FORGET_COPY),
+ LintId::of(drop_forget_ref::FORGET_REF),
+ LintId::of(duration_subsec::DURATION_SUBSEC),
+ LintId::of(entry::MAP_ENTRY),
+ LintId::of(enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT),
+ LintId::of(enum_variants::ENUM_VARIANT_NAMES),
+ LintId::of(enum_variants::MODULE_INCEPTION),
+ LintId::of(eq_op::EQ_OP),
+ LintId::of(eq_op::OP_REF),
+ LintId::of(erasing_op::ERASING_OP),
+ LintId::of(escape::BOXED_LOCAL),
+ LintId::of(eta_reduction::REDUNDANT_CLOSURE),
+ LintId::of(eval_order_dependence::DIVERGING_SUB_EXPRESSION),
+ LintId::of(eval_order_dependence::EVAL_ORDER_DEPENDENCE),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(float_equality_without_abs::FLOAT_EQUALITY_WITHOUT_ABS),
+ LintId::of(float_literal::EXCESSIVE_PRECISION),
+ LintId::of(format::USELESS_FORMAT),
+ LintId::of(format_args::FORMAT_IN_FORMAT_ARGS),
+ LintId::of(format_args::TO_STRING_IN_FORMAT_ARGS),
+ LintId::of(formatting::POSSIBLE_MISSING_COMMA),
+ LintId::of(formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_ELSE_FORMATTING),
+ LintId::of(formatting::SUSPICIOUS_UNARY_OP_FORMATTING),
+ LintId::of(from_over_into::FROM_OVER_INTO),
+ LintId::of(from_str_radix_10::FROM_STR_RADIX_10),
+ LintId::of(functions::DOUBLE_MUST_USE),
+ LintId::of(functions::MUST_USE_UNIT),
+ LintId::of(functions::NOT_UNSAFE_PTR_ARG_DEREF),
+ LintId::of(functions::RESULT_UNIT_ERR),
+ LintId::of(functions::TOO_MANY_ARGUMENTS),
+ LintId::of(get_last_with_len::GET_LAST_WITH_LEN),
+ LintId::of(identity_op::IDENTITY_OP),
+ LintId::of(if_let_mutex::IF_LET_MUTEX),
+ LintId::of(indexing_slicing::OUT_OF_BOUNDS_INDEXING),
+ LintId::of(infinite_iter::INFINITE_ITER),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING),
+ LintId::of(inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY),
+ LintId::of(init_numbered_fields::INIT_NUMBERED_FIELDS),
+ LintId::of(inline_fn_without_body::INLINE_FN_WITHOUT_BODY),
+ LintId::of(int_plus_one::INT_PLUS_ONE),
+ LintId::of(large_const_arrays::LARGE_CONST_ARRAYS),
+ LintId::of(large_enum_variant::LARGE_ENUM_VARIANT),
+ LintId::of(len_zero::COMPARISON_TO_EMPTY),
+ LintId::of(len_zero::LEN_WITHOUT_IS_EMPTY),
+ LintId::of(len_zero::LEN_ZERO),
+ LintId::of(let_underscore::LET_UNDERSCORE_LOCK),
+ LintId::of(lifetimes::EXTRA_UNUSED_LIFETIMES),
+ LintId::of(lifetimes::NEEDLESS_LIFETIMES),
+ LintId::of(literal_representation::INCONSISTENT_DIGIT_GROUPING),
+ LintId::of(literal_representation::MISTYPED_LITERAL_SUFFIXES),
+ LintId::of(literal_representation::UNUSUAL_BYTE_GROUPINGS),
+ LintId::of(loops::EMPTY_LOOP),
+ LintId::of(loops::EXPLICIT_COUNTER_LOOP),
+ LintId::of(loops::FOR_KV_MAP),
+ LintId::of(loops::FOR_LOOPS_OVER_FALLIBLES),
+ LintId::of(loops::ITER_NEXT_LOOP),
+ LintId::of(loops::MANUAL_FLATTEN),
+ LintId::of(loops::MANUAL_MEMCPY),
+ LintId::of(loops::MUT_RANGE_BOUND),
+ LintId::of(loops::NEEDLESS_COLLECT),
+ LintId::of(loops::NEEDLESS_RANGE_LOOP),
+ LintId::of(loops::NEVER_LOOP),
+ LintId::of(loops::SAME_ITEM_PUSH),
+ LintId::of(loops::SINGLE_ELEMENT_LOOP),
+ LintId::of(loops::WHILE_IMMUTABLE_CONDITION),
+ LintId::of(loops::WHILE_LET_LOOP),
+ LintId::of(loops::WHILE_LET_ON_ITERATOR),
+ LintId::of(main_recursion::MAIN_RECURSION),
+ LintId::of(manual_async_fn::MANUAL_ASYNC_FN),
+ LintId::of(manual_bits::MANUAL_BITS),
+ LintId::of(manual_map::MANUAL_MAP),
+ LintId::of(manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE),
+ LintId::of(manual_strip::MANUAL_STRIP),
+ LintId::of(manual_unwrap_or::MANUAL_UNWRAP_OR),
+ LintId::of(map_clone::MAP_CLONE),
+ LintId::of(map_unit_fn::OPTION_MAP_UNIT_FN),
+ LintId::of(map_unit_fn::RESULT_MAP_UNIT_FN),
+ LintId::of(match_result_ok::MATCH_RESULT_OK),
+ LintId::of(match_str_case_mismatch::MATCH_STR_CASE_MISMATCH),
+ LintId::of(matches::INFALLIBLE_DESTRUCTURING_MATCH),
+ LintId::of(matches::MATCH_AS_REF),
+ LintId::of(matches::MATCH_LIKE_MATCHES_MACRO),
+ LintId::of(matches::MATCH_OVERLAPPING_ARM),
+ LintId::of(matches::MATCH_REF_PATS),
+ LintId::of(matches::MATCH_SINGLE_BINDING),
+ LintId::of(matches::REDUNDANT_PATTERN_MATCHING),
+ LintId::of(matches::SINGLE_MATCH),
+ LintId::of(matches::WILDCARD_IN_OR_PATTERNS),
+ LintId::of(mem_replace::MEM_REPLACE_OPTION_WITH_NONE),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_DEFAULT),
+ LintId::of(mem_replace::MEM_REPLACE_WITH_UNINIT),
+ LintId::of(methods::BIND_INSTEAD_OF_MAP),
+ LintId::of(methods::BYTES_NTH),
+ LintId::of(methods::CHARS_LAST_CMP),
+ LintId::of(methods::CHARS_NEXT_CMP),
+ LintId::of(methods::CLONE_DOUBLE_REF),
+ LintId::of(methods::CLONE_ON_COPY),
+ LintId::of(methods::EXPECT_FUN_CALL),
+ LintId::of(methods::EXTEND_WITH_DRAIN),
+ LintId::of(methods::FILTER_MAP_IDENTITY),
+ LintId::of(methods::FILTER_NEXT),
+ LintId::of(methods::FLAT_MAP_IDENTITY),
+ LintId::of(methods::INSPECT_FOR_EACH),
+ LintId::of(methods::INTO_ITER_ON_REF),
+ LintId::of(methods::ITERATOR_STEP_BY_ZERO),
+ LintId::of(methods::ITER_CLONED_COLLECT),
+ LintId::of(methods::ITER_COUNT),
+ LintId::of(methods::ITER_NEXT_SLICE),
+ LintId::of(methods::ITER_NTH),
+ LintId::of(methods::ITER_NTH_ZERO),
+ LintId::of(methods::ITER_OVEREAGER_CLONED),
+ LintId::of(methods::ITER_SKIP_NEXT),
+ LintId::of(methods::MANUAL_FILTER_MAP),
+ LintId::of(methods::MANUAL_FIND_MAP),
+ LintId::of(methods::MANUAL_SATURATING_ARITHMETIC),
+ LintId::of(methods::MANUAL_SPLIT_ONCE),
+ LintId::of(methods::MANUAL_STR_REPEAT),
+ LintId::of(methods::MAP_COLLECT_RESULT_UNIT),
+ LintId::of(methods::MAP_FLATTEN),
+ LintId::of(methods::MAP_IDENTITY),
+ LintId::of(methods::NEEDLESS_SPLITN),
+ LintId::of(methods::NEW_RET_NO_SELF),
+ LintId::of(methods::OK_EXPECT),
+ LintId::of(methods::OPTION_AS_REF_DEREF),
+ LintId::of(methods::OPTION_FILTER_MAP),
+ LintId::of(methods::OPTION_MAP_OR_NONE),
+ LintId::of(methods::OR_FUN_CALL),
+ LintId::of(methods::RESULT_MAP_OR_INTO_OPTION),
+ LintId::of(methods::SEARCH_IS_SOME),
+ LintId::of(methods::SHOULD_IMPLEMENT_TRAIT),
+ LintId::of(methods::SINGLE_CHAR_ADD_STR),
+ LintId::of(methods::SINGLE_CHAR_PATTERN),
+ LintId::of(methods::SKIP_WHILE_NEXT),
+ LintId::of(methods::STRING_EXTEND_CHARS),
+ LintId::of(methods::SUSPICIOUS_MAP),
+ LintId::of(methods::SUSPICIOUS_SPLITN),
+ LintId::of(methods::UNINIT_ASSUMED_INIT),
+ LintId::of(methods::UNNECESSARY_FILTER_MAP),
+ LintId::of(methods::UNNECESSARY_FOLD),
+ LintId::of(methods::UNNECESSARY_LAZY_EVALUATIONS),
+ LintId::of(methods::UNNECESSARY_TO_OWNED),
+ LintId::of(methods::UNWRAP_OR_ELSE_DEFAULT),
+ LintId::of(methods::USELESS_ASREF),
+ LintId::of(methods::WRONG_SELF_CONVENTION),
+ LintId::of(methods::ZST_OFFSET),
+ LintId::of(minmax::MIN_MAX),
+ LintId::of(misc::CMP_NAN),
+ LintId::of(misc::CMP_OWNED),
+ LintId::of(misc::MODULO_ONE),
+ LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
+ LintId::of(misc::TOPLEVEL_REF_ARG),
+ LintId::of(misc::ZERO_PTR),
+ LintId::of(misc_early::BUILTIN_TYPE_SHADOW),
+ LintId::of(misc_early::DOUBLE_NEG),
+ LintId::of(misc_early::DUPLICATE_UNDERSCORE_ARGUMENT),
+ LintId::of(misc_early::MIXED_CASE_HEX_LITERALS),
+ LintId::of(misc_early::REDUNDANT_PATTERN),
+ LintId::of(misc_early::UNNEEDED_WILDCARD_PATTERN),
+ LintId::of(misc_early::ZERO_PREFIXED_LITERAL),
+ LintId::of(mut_key::MUTABLE_KEY_TYPE),
+ LintId::of(mut_mutex_lock::MUT_MUTEX_LOCK),
+ LintId::of(mut_reference::UNNECESSARY_MUT_PASSED),
+ LintId::of(needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE),
+ LintId::of(needless_bool::BOOL_COMPARISON),
+ LintId::of(needless_bool::NEEDLESS_BOOL),
+ LintId::of(needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE),
+ LintId::of(needless_late_init::NEEDLESS_LATE_INIT),
+ LintId::of(needless_option_as_deref::NEEDLESS_OPTION_AS_DEREF),
+ LintId::of(needless_question_mark::NEEDLESS_QUESTION_MARK),
+ LintId::of(needless_update::NEEDLESS_UPDATE),
+ LintId::of(neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD),
+ LintId::of(neg_multiply::NEG_MULTIPLY),
+ LintId::of(new_without_default::NEW_WITHOUT_DEFAULT),
+ LintId::of(no_effect::NO_EFFECT),
+ LintId::of(no_effect::UNNECESSARY_OPERATION),
+ LintId::of(non_copy_const::BORROW_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST),
+ LintId::of(non_expressive_names::JUST_UNDERSCORES_AND_DIGITS),
+ LintId::of(non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS),
+ LintId::of(octal_escapes::OCTAL_ESCAPES),
+ LintId::of(open_options::NONSENSICAL_OPEN_OPTIONS),
+ LintId::of(option_env_unwrap::OPTION_ENV_UNWRAP),
+ LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
+ LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr::CMP_NULL),
+ LintId::of(ptr::INVALID_NULL_PTR_USAGE),
+ LintId::of(ptr::MUT_FROM_REF),
+ LintId::of(ptr::PTR_ARG),
+ LintId::of(ptr_eq::PTR_EQ),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(question_mark::QUESTION_MARK),
+ LintId::of(ranges::MANUAL_RANGE_CONTAINS),
+ LintId::of(ranges::RANGE_ZIP_WITH_LEN),
+ LintId::of(ranges::REVERSED_EMPTY_RANGES),
+ LintId::of(redundant_clone::REDUNDANT_CLONE),
+ LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
+ LintId::of(redundant_field_names::REDUNDANT_FIELD_NAMES),
+ LintId::of(redundant_slicing::REDUNDANT_SLICING),
+ LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
+ LintId::of(reference::DEREF_ADDROF),
+ LintId::of(regex::INVALID_REGEX),
+ LintId::of(repeat_once::REPEAT_ONCE),
+ LintId::of(returns::LET_AND_RETURN),
+ LintId::of(returns::NEEDLESS_RETURN),
+ LintId::of(self_assignment::SELF_ASSIGNMENT),
+ LintId::of(self_named_constructors::SELF_NAMED_CONSTRUCTORS),
+ LintId::of(serde_api::SERDE_API_MISUSE),
+ LintId::of(single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS),
+ LintId::of(size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT),
+ LintId::of(slow_vector_initialization::SLOW_VECTOR_INITIALIZATION),
+ LintId::of(stable_sort_primitive::STABLE_SORT_PRIMITIVE),
+ LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
+ LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
+ LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
+ LintId::of(swap::ALMOST_SWAPPED),
+ LintId::of(swap::MANUAL_SWAP),
+ LintId::of(tabs_in_doc_comments::TABS_IN_DOC_COMMENTS),
+ LintId::of(temporary_assignment::TEMPORARY_ASSIGNMENT),
+ LintId::of(to_digit_is_some::TO_DIGIT_IS_SOME),
+ LintId::of(to_string_in_display::TO_STRING_IN_DISPLAY),
+ LintId::of(transmute::CROSSPOINTER_TRANSMUTE),
+ LintId::of(transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS),
+ LintId::of(transmute::TRANSMUTE_BYTES_TO_STR),
+ LintId::of(transmute::TRANSMUTE_FLOAT_TO_INT),
+ LintId::of(transmute::TRANSMUTE_INT_TO_BOOL),
+ LintId::of(transmute::TRANSMUTE_INT_TO_CHAR),
+ LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
+ LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
+ LintId::of(transmute::UNSOUND_COLLECTION_TRANSMUTE),
+ LintId::of(transmute::WRONG_TRANSMUTE),
+ LintId::of(transmuting_null::TRANSMUTING_NULL),
+ LintId::of(try_err::TRY_ERR),
+ LintId::of(types::BORROWED_BOX),
+ LintId::of(types::BOX_COLLECTION),
+ LintId::of(types::REDUNDANT_ALLOCATION),
+ LintId::of(types::TYPE_COMPLEXITY),
+ LintId::of(types::VEC_BOX),
+ LintId::of(undropped_manually_drops::UNDROPPED_MANUALLY_DROPS),
+ LintId::of(unicode::INVISIBLE_CHARACTERS),
+ LintId::of(uninit_vec::UNINIT_VEC),
+ LintId::of(unit_hash::UNIT_HASH),
+ LintId::of(unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD),
+ LintId::of(unit_types::UNIT_ARG),
+ LintId::of(unit_types::UNIT_CMP),
+ LintId::of(unnamed_address::FN_ADDRESS_COMPARISONS),
+ LintId::of(unnamed_address::VTABLE_ADDRESS_COMPARISONS),
+ LintId::of(unnecessary_sort_by::UNNECESSARY_SORT_BY),
+ LintId::of(unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME),
+ LintId::of(unused_io_amount::UNUSED_IO_AMOUNT),
+ LintId::of(unused_unit::UNUSED_UNIT),
+ LintId::of(unwrap::PANICKING_UNWRAP),
+ LintId::of(unwrap::UNNECESSARY_UNWRAP),
+ LintId::of(upper_case_acronyms::UPPER_CASE_ACRONYMS),
+ LintId::of(useless_conversion::USELESS_CONVERSION),
+ LintId::of(vec::USELESS_VEC),
+ LintId::of(vec_init_then_push::VEC_INIT_THEN_PUSH),
+ LintId::of(vec_resize_to_zero::VEC_RESIZE_TO_ZERO),
+ LintId::of(write::PRINTLN_EMPTY_STRING),
+ LintId::of(write::PRINT_LITERAL),
+ LintId::of(write::PRINT_WITH_NEWLINE),
+ LintId::of(write::WRITELN_EMPTY_STRING),
+ LintId::of(write::WRITE_LITERAL),
+ LintId::of(write::WRITE_WITH_NEWLINE),
+ LintId::of(zero_div_zero::ZERO_DIVIDED_BY_ZERO),
+])
--- /dev/null
- LintId::of(reference::REF_IN_DEREF),
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_group(true, "clippy::complexity", Some("clippy_complexity"), vec![
+ LintId::of(attrs::DEPRECATED_CFG_ATTR),
+ LintId::of(booleans::NONMINIMAL_BOOL),
+ LintId::of(casts::CHAR_LIT_AS_U8),
+ LintId::of(casts::UNNECESSARY_CAST),
+ LintId::of(derivable_impls::DERIVABLE_IMPLS),
+ LintId::of(double_comparison::DOUBLE_COMPARISONS),
+ LintId::of(double_parens::DOUBLE_PARENS),
+ LintId::of(duration_subsec::DURATION_SUBSEC),
+ LintId::of(eval_order_dependence::DIVERGING_SUB_EXPRESSION),
+ LintId::of(explicit_write::EXPLICIT_WRITE),
+ LintId::of(format::USELESS_FORMAT),
+ LintId::of(functions::TOO_MANY_ARGUMENTS),
+ LintId::of(get_last_with_len::GET_LAST_WITH_LEN),
+ LintId::of(identity_op::IDENTITY_OP),
+ LintId::of(int_plus_one::INT_PLUS_ONE),
+ LintId::of(lifetimes::EXTRA_UNUSED_LIFETIMES),
+ LintId::of(lifetimes::NEEDLESS_LIFETIMES),
+ LintId::of(loops::EXPLICIT_COUNTER_LOOP),
+ LintId::of(loops::MANUAL_FLATTEN),
+ LintId::of(loops::SINGLE_ELEMENT_LOOP),
+ LintId::of(loops::WHILE_LET_LOOP),
+ LintId::of(manual_strip::MANUAL_STRIP),
+ LintId::of(manual_unwrap_or::MANUAL_UNWRAP_OR),
+ LintId::of(map_unit_fn::OPTION_MAP_UNIT_FN),
+ LintId::of(map_unit_fn::RESULT_MAP_UNIT_FN),
+ LintId::of(matches::MATCH_AS_REF),
+ LintId::of(matches::MATCH_SINGLE_BINDING),
+ LintId::of(matches::WILDCARD_IN_OR_PATTERNS),
+ LintId::of(methods::BIND_INSTEAD_OF_MAP),
+ LintId::of(methods::CLONE_ON_COPY),
+ LintId::of(methods::FILTER_MAP_IDENTITY),
+ LintId::of(methods::FILTER_NEXT),
+ LintId::of(methods::FLAT_MAP_IDENTITY),
+ LintId::of(methods::INSPECT_FOR_EACH),
+ LintId::of(methods::ITER_COUNT),
+ LintId::of(methods::MANUAL_FILTER_MAP),
+ LintId::of(methods::MANUAL_FIND_MAP),
+ LintId::of(methods::MANUAL_SPLIT_ONCE),
+ LintId::of(methods::MAP_FLATTEN),
+ LintId::of(methods::MAP_IDENTITY),
+ LintId::of(methods::NEEDLESS_SPLITN),
+ LintId::of(methods::OPTION_AS_REF_DEREF),
+ LintId::of(methods::OPTION_FILTER_MAP),
+ LintId::of(methods::SEARCH_IS_SOME),
+ LintId::of(methods::SKIP_WHILE_NEXT),
+ LintId::of(methods::UNNECESSARY_FILTER_MAP),
+ LintId::of(methods::USELESS_ASREF),
+ LintId::of(misc::SHORT_CIRCUIT_STATEMENT),
+ LintId::of(misc_early::UNNEEDED_WILDCARD_PATTERN),
+ LintId::of(misc_early::ZERO_PREFIXED_LITERAL),
+ LintId::of(needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE),
+ LintId::of(needless_bool::BOOL_COMPARISON),
+ LintId::of(needless_bool::NEEDLESS_BOOL),
+ LintId::of(needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE),
+ LintId::of(needless_option_as_deref::NEEDLESS_OPTION_AS_DEREF),
+ LintId::of(needless_question_mark::NEEDLESS_QUESTION_MARK),
+ LintId::of(needless_update::NEEDLESS_UPDATE),
+ LintId::of(neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD),
+ LintId::of(no_effect::NO_EFFECT),
+ LintId::of(no_effect::UNNECESSARY_OPERATION),
+ LintId::of(overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL),
+ LintId::of(partialeq_ne_impl::PARTIALEQ_NE_IMPL),
+ LintId::of(precedence::PRECEDENCE),
+ LintId::of(ptr_offset_with_cast::PTR_OFFSET_WITH_CAST),
+ LintId::of(ranges::RANGE_ZIP_WITH_LEN),
+ LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
+ LintId::of(redundant_slicing::REDUNDANT_SLICING),
+ LintId::of(reference::DEREF_ADDROF),
+ LintId::of(repeat_once::REPEAT_ONCE),
+ LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
+ LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),
+ LintId::of(swap::MANUAL_SWAP),
+ LintId::of(temporary_assignment::TEMPORARY_ASSIGNMENT),
+ LintId::of(transmute::CROSSPOINTER_TRANSMUTE),
+ LintId::of(transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS),
+ LintId::of(transmute::TRANSMUTE_BYTES_TO_STR),
+ LintId::of(transmute::TRANSMUTE_FLOAT_TO_INT),
+ LintId::of(transmute::TRANSMUTE_INT_TO_BOOL),
+ LintId::of(transmute::TRANSMUTE_INT_TO_CHAR),
+ LintId::of(transmute::TRANSMUTE_INT_TO_FLOAT),
+ LintId::of(transmute::TRANSMUTE_NUM_TO_BYTES),
+ LintId::of(transmute::TRANSMUTE_PTR_TO_REF),
+ LintId::of(types::BORROWED_BOX),
+ LintId::of(types::TYPE_COMPLEXITY),
+ LintId::of(types::VEC_BOX),
+ LintId::of(unit_types::UNIT_ARG),
+ LintId::of(unnecessary_sort_by::UNNECESSARY_SORT_BY),
+ LintId::of(unwrap::UNNECESSARY_UNWRAP),
+ LintId::of(useless_conversion::USELESS_CONVERSION),
+ LintId::of(zero_div_zero::ZERO_DIVIDED_BY_ZERO),
+])
--- /dev/null
- reference::REF_IN_DEREF,
+// This file was generated by `cargo dev update_lints`.
+// Use that command to update this file and do not edit by hand.
+// Manual edits will be overwritten.
+
+store.register_lints(&[
+ #[cfg(feature = "internal")]
+ utils::internal_lints::CLIPPY_LINTS_INTERNAL,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::COLLAPSIBLE_SPAN_LINT_CALLS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::COMPILER_LINT_FUNCTIONS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::DEFAULT_LINT,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::IF_CHAIN_STYLE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INTERNING_DEFINED_SYMBOL,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::INVALID_PATHS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::LINT_WITHOUT_LINT_PASS,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::OUTER_EXPN_EXPN_DATA,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::PRODUCE_ICE,
+ #[cfg(feature = "internal")]
+ utils::internal_lints::UNNECESSARY_SYMBOL_STR,
+ absurd_extreme_comparisons::ABSURD_EXTREME_COMPARISONS,
+ approx_const::APPROX_CONSTANT,
+ arithmetic::FLOAT_ARITHMETIC,
+ arithmetic::INTEGER_ARITHMETIC,
+ as_conversions::AS_CONVERSIONS,
+ asm_syntax::INLINE_ASM_X86_ATT_SYNTAX,
+ asm_syntax::INLINE_ASM_X86_INTEL_SYNTAX,
+ assertions_on_constants::ASSERTIONS_ON_CONSTANTS,
+ assign_ops::ASSIGN_OP_PATTERN,
+ assign_ops::MISREFACTORED_ASSIGN_OP,
+ async_yields_async::ASYNC_YIELDS_ASYNC,
+ attrs::BLANKET_CLIPPY_RESTRICTION_LINTS,
+ attrs::DEPRECATED_CFG_ATTR,
+ attrs::DEPRECATED_SEMVER,
+ attrs::EMPTY_LINE_AFTER_OUTER_ATTR,
+ attrs::INLINE_ALWAYS,
+ attrs::MISMATCHED_TARGET_OS,
+ attrs::USELESS_ATTRIBUTE,
+ await_holding_invalid::AWAIT_HOLDING_LOCK,
+ await_holding_invalid::AWAIT_HOLDING_REFCELL_REF,
+ bit_mask::BAD_BIT_MASK,
+ bit_mask::INEFFECTIVE_BIT_MASK,
+ bit_mask::VERBOSE_BIT_MASK,
+ blacklisted_name::BLACKLISTED_NAME,
+ blocks_in_if_conditions::BLOCKS_IN_IF_CONDITIONS,
+ bool_assert_comparison::BOOL_ASSERT_COMPARISON,
+ booleans::LOGIC_BUG,
+ booleans::NONMINIMAL_BOOL,
+ borrow_as_ptr::BORROW_AS_PTR,
+ bytecount::NAIVE_BYTECOUNT,
+ cargo_common_metadata::CARGO_COMMON_METADATA,
+ case_sensitive_file_extension_comparisons::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS,
+ casts::CAST_LOSSLESS,
+ casts::CAST_POSSIBLE_TRUNCATION,
+ casts::CAST_POSSIBLE_WRAP,
+ casts::CAST_PRECISION_LOSS,
+ casts::CAST_PTR_ALIGNMENT,
+ casts::CAST_REF_TO_MUT,
+ casts::CAST_SIGN_LOSS,
+ casts::CHAR_LIT_AS_U8,
+ casts::FN_TO_NUMERIC_CAST,
+ casts::FN_TO_NUMERIC_CAST_ANY,
+ casts::FN_TO_NUMERIC_CAST_WITH_TRUNCATION,
+ casts::PTR_AS_PTR,
+ casts::UNNECESSARY_CAST,
+ checked_conversions::CHECKED_CONVERSIONS,
+ cognitive_complexity::COGNITIVE_COMPLEXITY,
+ collapsible_if::COLLAPSIBLE_ELSE_IF,
+ collapsible_if::COLLAPSIBLE_IF,
+ collapsible_match::COLLAPSIBLE_MATCH,
+ comparison_chain::COMPARISON_CHAIN,
+ copies::BRANCHES_SHARING_CODE,
+ copies::IFS_SAME_COND,
+ copies::IF_SAME_THEN_ELSE,
+ copies::SAME_FUNCTIONS_IN_IF_CONDITION,
+ copy_iterator::COPY_ITERATOR,
+ create_dir::CREATE_DIR,
+ dbg_macro::DBG_MACRO,
+ default::DEFAULT_TRAIT_ACCESS,
+ default::FIELD_REASSIGN_WITH_DEFAULT,
+ default_numeric_fallback::DEFAULT_NUMERIC_FALLBACK,
+ dereference::EXPLICIT_DEREF_METHODS,
+ dereference::NEEDLESS_BORROW,
+ dereference::REF_BINDING_TO_REFERENCE,
+ derivable_impls::DERIVABLE_IMPLS,
+ derive::DERIVE_HASH_XOR_EQ,
+ derive::DERIVE_ORD_XOR_PARTIAL_ORD,
+ derive::EXPL_IMPL_CLONE_ON_COPY,
+ derive::UNSAFE_DERIVE_DESERIALIZE,
+ disallowed_methods::DISALLOWED_METHODS,
+ disallowed_script_idents::DISALLOWED_SCRIPT_IDENTS,
+ disallowed_types::DISALLOWED_TYPES,
+ doc::DOC_MARKDOWN,
+ doc::MISSING_ERRORS_DOC,
+ doc::MISSING_PANICS_DOC,
+ doc::MISSING_SAFETY_DOC,
+ doc::NEEDLESS_DOCTEST_MAIN,
+ double_comparison::DOUBLE_COMPARISONS,
+ double_parens::DOUBLE_PARENS,
+ drop_forget_ref::DROP_COPY,
+ drop_forget_ref::DROP_REF,
+ drop_forget_ref::FORGET_COPY,
+ drop_forget_ref::FORGET_REF,
+ duration_subsec::DURATION_SUBSEC,
+ else_if_without_else::ELSE_IF_WITHOUT_ELSE,
+ empty_enum::EMPTY_ENUM,
+ entry::MAP_ENTRY,
+ enum_clike::ENUM_CLIKE_UNPORTABLE_VARIANT,
+ enum_variants::ENUM_VARIANT_NAMES,
+ enum_variants::MODULE_INCEPTION,
+ enum_variants::MODULE_NAME_REPETITIONS,
+ eq_op::EQ_OP,
+ eq_op::OP_REF,
+ equatable_if_let::EQUATABLE_IF_LET,
+ erasing_op::ERASING_OP,
+ escape::BOXED_LOCAL,
+ eta_reduction::REDUNDANT_CLOSURE,
+ eta_reduction::REDUNDANT_CLOSURE_FOR_METHOD_CALLS,
+ eval_order_dependence::DIVERGING_SUB_EXPRESSION,
+ eval_order_dependence::EVAL_ORDER_DEPENDENCE,
+ excessive_bools::FN_PARAMS_EXCESSIVE_BOOLS,
+ excessive_bools::STRUCT_EXCESSIVE_BOOLS,
+ exhaustive_items::EXHAUSTIVE_ENUMS,
+ exhaustive_items::EXHAUSTIVE_STRUCTS,
+ exit::EXIT,
+ explicit_write::EXPLICIT_WRITE,
+ fallible_impl_from::FALLIBLE_IMPL_FROM,
+ feature_name::NEGATIVE_FEATURE_NAMES,
+ feature_name::REDUNDANT_FEATURE_NAMES,
+ float_equality_without_abs::FLOAT_EQUALITY_WITHOUT_ABS,
+ float_literal::EXCESSIVE_PRECISION,
+ float_literal::LOSSY_FLOAT_LITERAL,
+ floating_point_arithmetic::IMPRECISE_FLOPS,
+ floating_point_arithmetic::SUBOPTIMAL_FLOPS,
+ format::USELESS_FORMAT,
+ format_args::FORMAT_IN_FORMAT_ARGS,
+ format_args::TO_STRING_IN_FORMAT_ARGS,
+ formatting::POSSIBLE_MISSING_COMMA,
+ formatting::SUSPICIOUS_ASSIGNMENT_FORMATTING,
+ formatting::SUSPICIOUS_ELSE_FORMATTING,
+ formatting::SUSPICIOUS_UNARY_OP_FORMATTING,
+ from_over_into::FROM_OVER_INTO,
+ from_str_radix_10::FROM_STR_RADIX_10,
+ functions::DOUBLE_MUST_USE,
+ functions::MUST_USE_CANDIDATE,
+ functions::MUST_USE_UNIT,
+ functions::NOT_UNSAFE_PTR_ARG_DEREF,
+ functions::RESULT_UNIT_ERR,
+ functions::TOO_MANY_ARGUMENTS,
+ functions::TOO_MANY_LINES,
+ future_not_send::FUTURE_NOT_SEND,
+ get_last_with_len::GET_LAST_WITH_LEN,
+ identity_op::IDENTITY_OP,
+ if_let_mutex::IF_LET_MUTEX,
+ if_not_else::IF_NOT_ELSE,
+ if_then_some_else_none::IF_THEN_SOME_ELSE_NONE,
+ implicit_hasher::IMPLICIT_HASHER,
+ implicit_return::IMPLICIT_RETURN,
+ implicit_saturating_sub::IMPLICIT_SATURATING_SUB,
+ inconsistent_struct_constructor::INCONSISTENT_STRUCT_CONSTRUCTOR,
+ index_refutable_slice::INDEX_REFUTABLE_SLICE,
+ indexing_slicing::INDEXING_SLICING,
+ indexing_slicing::OUT_OF_BOUNDS_INDEXING,
+ infinite_iter::INFINITE_ITER,
+ infinite_iter::MAYBE_INFINITE_ITER,
+ inherent_impl::MULTIPLE_INHERENT_IMPL,
+ inherent_to_string::INHERENT_TO_STRING,
+ inherent_to_string::INHERENT_TO_STRING_SHADOW_DISPLAY,
+ init_numbered_fields::INIT_NUMBERED_FIELDS,
+ inline_fn_without_body::INLINE_FN_WITHOUT_BODY,
+ int_plus_one::INT_PLUS_ONE,
+ integer_division::INTEGER_DIVISION,
+ invalid_upcast_comparisons::INVALID_UPCAST_COMPARISONS,
+ items_after_statements::ITEMS_AFTER_STATEMENTS,
+ iter_not_returning_iterator::ITER_NOT_RETURNING_ITERATOR,
+ large_const_arrays::LARGE_CONST_ARRAYS,
+ large_enum_variant::LARGE_ENUM_VARIANT,
+ large_stack_arrays::LARGE_STACK_ARRAYS,
+ len_zero::COMPARISON_TO_EMPTY,
+ len_zero::LEN_WITHOUT_IS_EMPTY,
+ len_zero::LEN_ZERO,
+ let_if_seq::USELESS_LET_IF_SEQ,
+ let_underscore::LET_UNDERSCORE_DROP,
+ let_underscore::LET_UNDERSCORE_LOCK,
+ let_underscore::LET_UNDERSCORE_MUST_USE,
+ lifetimes::EXTRA_UNUSED_LIFETIMES,
+ lifetimes::NEEDLESS_LIFETIMES,
+ literal_representation::DECIMAL_LITERAL_REPRESENTATION,
+ literal_representation::INCONSISTENT_DIGIT_GROUPING,
+ literal_representation::LARGE_DIGIT_GROUPS,
+ literal_representation::MISTYPED_LITERAL_SUFFIXES,
+ literal_representation::UNREADABLE_LITERAL,
+ literal_representation::UNUSUAL_BYTE_GROUPINGS,
+ loops::EMPTY_LOOP,
+ loops::EXPLICIT_COUNTER_LOOP,
+ loops::EXPLICIT_INTO_ITER_LOOP,
+ loops::EXPLICIT_ITER_LOOP,
+ loops::FOR_KV_MAP,
+ loops::FOR_LOOPS_OVER_FALLIBLES,
+ loops::ITER_NEXT_LOOP,
+ loops::MANUAL_FLATTEN,
+ loops::MANUAL_MEMCPY,
+ loops::MUT_RANGE_BOUND,
+ loops::NEEDLESS_COLLECT,
+ loops::NEEDLESS_RANGE_LOOP,
+ loops::NEVER_LOOP,
+ loops::SAME_ITEM_PUSH,
+ loops::SINGLE_ELEMENT_LOOP,
+ loops::WHILE_IMMUTABLE_CONDITION,
+ loops::WHILE_LET_LOOP,
+ loops::WHILE_LET_ON_ITERATOR,
+ macro_use::MACRO_USE_IMPORTS,
+ main_recursion::MAIN_RECURSION,
+ manual_assert::MANUAL_ASSERT,
+ manual_async_fn::MANUAL_ASYNC_FN,
+ manual_bits::MANUAL_BITS,
+ manual_map::MANUAL_MAP,
+ manual_non_exhaustive::MANUAL_NON_EXHAUSTIVE,
+ manual_ok_or::MANUAL_OK_OR,
+ manual_strip::MANUAL_STRIP,
+ manual_unwrap_or::MANUAL_UNWRAP_OR,
+ map_clone::MAP_CLONE,
+ map_err_ignore::MAP_ERR_IGNORE,
+ map_unit_fn::OPTION_MAP_UNIT_FN,
+ map_unit_fn::RESULT_MAP_UNIT_FN,
+ match_on_vec_items::MATCH_ON_VEC_ITEMS,
+ match_result_ok::MATCH_RESULT_OK,
+ match_str_case_mismatch::MATCH_STR_CASE_MISMATCH,
+ matches::INFALLIBLE_DESTRUCTURING_MATCH,
+ matches::MATCH_AS_REF,
+ matches::MATCH_BOOL,
+ matches::MATCH_LIKE_MATCHES_MACRO,
+ matches::MATCH_OVERLAPPING_ARM,
+ matches::MATCH_REF_PATS,
+ matches::MATCH_SAME_ARMS,
+ matches::MATCH_SINGLE_BINDING,
+ matches::MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ matches::MATCH_WILD_ERR_ARM,
+ matches::REDUNDANT_PATTERN_MATCHING,
+ matches::REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ matches::SINGLE_MATCH,
+ matches::SINGLE_MATCH_ELSE,
+ matches::WILDCARD_ENUM_MATCH_ARM,
+ matches::WILDCARD_IN_OR_PATTERNS,
+ mem_forget::MEM_FORGET,
+ mem_replace::MEM_REPLACE_OPTION_WITH_NONE,
+ mem_replace::MEM_REPLACE_WITH_DEFAULT,
+ mem_replace::MEM_REPLACE_WITH_UNINIT,
+ methods::BIND_INSTEAD_OF_MAP,
+ methods::BYTES_NTH,
+ methods::CHARS_LAST_CMP,
+ methods::CHARS_NEXT_CMP,
+ methods::CLONED_INSTEAD_OF_COPIED,
+ methods::CLONE_DOUBLE_REF,
+ methods::CLONE_ON_COPY,
+ methods::CLONE_ON_REF_PTR,
+ methods::EXPECT_FUN_CALL,
+ methods::EXPECT_USED,
+ methods::EXTEND_WITH_DRAIN,
+ methods::FILETYPE_IS_FILE,
+ methods::FILTER_MAP_IDENTITY,
+ methods::FILTER_MAP_NEXT,
+ methods::FILTER_NEXT,
+ methods::FLAT_MAP_IDENTITY,
+ methods::FLAT_MAP_OPTION,
+ methods::FROM_ITER_INSTEAD_OF_COLLECT,
+ methods::GET_UNWRAP,
+ methods::IMPLICIT_CLONE,
+ methods::INEFFICIENT_TO_STRING,
+ methods::INSPECT_FOR_EACH,
+ methods::INTO_ITER_ON_REF,
+ methods::ITERATOR_STEP_BY_ZERO,
+ methods::ITER_CLONED_COLLECT,
+ methods::ITER_COUNT,
+ methods::ITER_NEXT_SLICE,
+ methods::ITER_NTH,
+ methods::ITER_NTH_ZERO,
+ methods::ITER_OVEREAGER_CLONED,
+ methods::ITER_SKIP_NEXT,
+ methods::MANUAL_FILTER_MAP,
+ methods::MANUAL_FIND_MAP,
+ methods::MANUAL_SATURATING_ARITHMETIC,
+ methods::MANUAL_SPLIT_ONCE,
+ methods::MANUAL_STR_REPEAT,
+ methods::MAP_COLLECT_RESULT_UNIT,
+ methods::MAP_FLATTEN,
+ methods::MAP_IDENTITY,
+ methods::MAP_UNWRAP_OR,
+ methods::NEEDLESS_SPLITN,
+ methods::NEW_RET_NO_SELF,
+ methods::OK_EXPECT,
+ methods::OPTION_AS_REF_DEREF,
+ methods::OPTION_FILTER_MAP,
+ methods::OPTION_MAP_OR_NONE,
+ methods::OR_FUN_CALL,
+ methods::RESULT_MAP_OR_INTO_OPTION,
+ methods::SEARCH_IS_SOME,
+ methods::SHOULD_IMPLEMENT_TRAIT,
+ methods::SINGLE_CHAR_ADD_STR,
+ methods::SINGLE_CHAR_PATTERN,
+ methods::SKIP_WHILE_NEXT,
+ methods::STRING_EXTEND_CHARS,
+ methods::SUSPICIOUS_MAP,
+ methods::SUSPICIOUS_SPLITN,
+ methods::UNINIT_ASSUMED_INIT,
+ methods::UNNECESSARY_FILTER_MAP,
+ methods::UNNECESSARY_FOLD,
+ methods::UNNECESSARY_LAZY_EVALUATIONS,
+ methods::UNNECESSARY_TO_OWNED,
+ methods::UNWRAP_OR_ELSE_DEFAULT,
+ methods::UNWRAP_USED,
+ methods::USELESS_ASREF,
+ methods::WRONG_SELF_CONVENTION,
+ methods::ZST_OFFSET,
+ minmax::MIN_MAX,
+ misc::CMP_NAN,
+ misc::CMP_OWNED,
+ misc::FLOAT_CMP,
+ misc::FLOAT_CMP_CONST,
+ misc::MODULO_ONE,
+ misc::SHORT_CIRCUIT_STATEMENT,
+ misc::TOPLEVEL_REF_ARG,
+ misc::USED_UNDERSCORE_BINDING,
+ misc::ZERO_PTR,
+ misc_early::BUILTIN_TYPE_SHADOW,
+ misc_early::DOUBLE_NEG,
+ misc_early::DUPLICATE_UNDERSCORE_ARGUMENT,
+ misc_early::MIXED_CASE_HEX_LITERALS,
+ misc_early::REDUNDANT_PATTERN,
+ misc_early::SEPARATED_LITERAL_SUFFIX,
+ misc_early::UNNEEDED_FIELD_PATTERN,
+ misc_early::UNNEEDED_WILDCARD_PATTERN,
+ misc_early::UNSEPARATED_LITERAL_SUFFIX,
+ misc_early::ZERO_PREFIXED_LITERAL,
+ missing_const_for_fn::MISSING_CONST_FOR_FN,
+ missing_doc::MISSING_DOCS_IN_PRIVATE_ITEMS,
+ missing_enforced_import_rename::MISSING_ENFORCED_IMPORT_RENAMES,
+ missing_inline::MISSING_INLINE_IN_PUBLIC_ITEMS,
+ module_style::MOD_MODULE_FILES,
+ module_style::SELF_NAMED_MODULE_FILES,
+ modulo_arithmetic::MODULO_ARITHMETIC,
+ multiple_crate_versions::MULTIPLE_CRATE_VERSIONS,
+ mut_key::MUTABLE_KEY_TYPE,
+ mut_mut::MUT_MUT,
+ mut_mutex_lock::MUT_MUTEX_LOCK,
+ mut_reference::UNNECESSARY_MUT_PASSED,
+ mutable_debug_assertion::DEBUG_ASSERT_WITH_MUT_CALL,
+ mutex_atomic::MUTEX_ATOMIC,
+ mutex_atomic::MUTEX_INTEGER,
+ needless_arbitrary_self_type::NEEDLESS_ARBITRARY_SELF_TYPE,
+ needless_bitwise_bool::NEEDLESS_BITWISE_BOOL,
+ needless_bool::BOOL_COMPARISON,
+ needless_bool::NEEDLESS_BOOL,
+ needless_borrowed_ref::NEEDLESS_BORROWED_REFERENCE,
+ needless_continue::NEEDLESS_CONTINUE,
+ needless_for_each::NEEDLESS_FOR_EACH,
+ needless_late_init::NEEDLESS_LATE_INIT,
+ needless_option_as_deref::NEEDLESS_OPTION_AS_DEREF,
+ needless_pass_by_value::NEEDLESS_PASS_BY_VALUE,
+ needless_question_mark::NEEDLESS_QUESTION_MARK,
+ needless_update::NEEDLESS_UPDATE,
+ neg_cmp_op_on_partial_ord::NEG_CMP_OP_ON_PARTIAL_ORD,
+ neg_multiply::NEG_MULTIPLY,
+ new_without_default::NEW_WITHOUT_DEFAULT,
+ no_effect::NO_EFFECT,
+ no_effect::NO_EFFECT_UNDERSCORE_BINDING,
+ no_effect::UNNECESSARY_OPERATION,
+ non_copy_const::BORROW_INTERIOR_MUTABLE_CONST,
+ non_copy_const::DECLARE_INTERIOR_MUTABLE_CONST,
+ non_expressive_names::JUST_UNDERSCORES_AND_DIGITS,
+ non_expressive_names::MANY_SINGLE_CHAR_NAMES,
+ non_expressive_names::SIMILAR_NAMES,
+ non_octal_unix_permissions::NON_OCTAL_UNIX_PERMISSIONS,
+ non_send_fields_in_send_ty::NON_SEND_FIELDS_IN_SEND_TY,
+ nonstandard_macro_braces::NONSTANDARD_MACRO_BRACES,
+ octal_escapes::OCTAL_ESCAPES,
+ open_options::NONSENSICAL_OPEN_OPTIONS,
+ option_env_unwrap::OPTION_ENV_UNWRAP,
+ option_if_let_else::OPTION_IF_LET_ELSE,
+ overflow_check_conditional::OVERFLOW_CHECK_CONDITIONAL,
+ panic_in_result_fn::PANIC_IN_RESULT_FN,
+ panic_unimplemented::PANIC,
+ panic_unimplemented::TODO,
+ panic_unimplemented::UNIMPLEMENTED,
+ panic_unimplemented::UNREACHABLE,
+ partialeq_ne_impl::PARTIALEQ_NE_IMPL,
+ pass_by_ref_or_value::LARGE_TYPES_PASSED_BY_VALUE,
+ pass_by_ref_or_value::TRIVIALLY_COPY_PASS_BY_REF,
+ path_buf_push_overwrite::PATH_BUF_PUSH_OVERWRITE,
+ pattern_type_mismatch::PATTERN_TYPE_MISMATCH,
+ precedence::PRECEDENCE,
+ ptr::CMP_NULL,
+ ptr::INVALID_NULL_PTR_USAGE,
+ ptr::MUT_FROM_REF,
+ ptr::PTR_ARG,
+ ptr_eq::PTR_EQ,
+ ptr_offset_with_cast::PTR_OFFSET_WITH_CAST,
+ question_mark::QUESTION_MARK,
+ ranges::MANUAL_RANGE_CONTAINS,
+ ranges::RANGE_MINUS_ONE,
+ ranges::RANGE_PLUS_ONE,
+ ranges::RANGE_ZIP_WITH_LEN,
+ ranges::REVERSED_EMPTY_RANGES,
+ redundant_clone::REDUNDANT_CLONE,
+ redundant_closure_call::REDUNDANT_CLOSURE_CALL,
+ redundant_else::REDUNDANT_ELSE,
+ redundant_field_names::REDUNDANT_FIELD_NAMES,
+ redundant_pub_crate::REDUNDANT_PUB_CRATE,
+ redundant_slicing::REDUNDANT_SLICING,
+ redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
+ ref_option_ref::REF_OPTION_REF,
+ reference::DEREF_ADDROF,
+ regex::INVALID_REGEX,
+ regex::TRIVIAL_REGEX,
+ repeat_once::REPEAT_ONCE,
+ return_self_not_must_use::RETURN_SELF_NOT_MUST_USE,
+ returns::LET_AND_RETURN,
+ returns::NEEDLESS_RETURN,
+ same_name_method::SAME_NAME_METHOD,
+ self_assignment::SELF_ASSIGNMENT,
+ self_named_constructors::SELF_NAMED_CONSTRUCTORS,
+ semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED,
+ serde_api::SERDE_API_MISUSE,
+ shadow::SHADOW_REUSE,
+ shadow::SHADOW_SAME,
+ shadow::SHADOW_UNRELATED,
+ single_char_lifetime_names::SINGLE_CHAR_LIFETIME_NAMES,
+ single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS,
+ size_of_in_element_count::SIZE_OF_IN_ELEMENT_COUNT,
+ slow_vector_initialization::SLOW_VECTOR_INITIALIZATION,
+ stable_sort_primitive::STABLE_SORT_PRIMITIVE,
+ strings::STRING_ADD,
+ strings::STRING_ADD_ASSIGN,
+ strings::STRING_FROM_UTF8_AS_BYTES,
+ strings::STRING_LIT_AS_BYTES,
+ strings::STRING_SLICE,
+ strings::STRING_TO_STRING,
+ strings::STR_TO_STRING,
+ strlen_on_c_strings::STRLEN_ON_C_STRINGS,
+ suspicious_operation_groupings::SUSPICIOUS_OPERATION_GROUPINGS,
+ suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL,
+ suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL,
+ swap::ALMOST_SWAPPED,
+ swap::MANUAL_SWAP,
+ tabs_in_doc_comments::TABS_IN_DOC_COMMENTS,
+ temporary_assignment::TEMPORARY_ASSIGNMENT,
+ to_digit_is_some::TO_DIGIT_IS_SOME,
+ to_string_in_display::TO_STRING_IN_DISPLAY,
+ trailing_empty_array::TRAILING_EMPTY_ARRAY,
+ trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS,
+ trait_bounds::TYPE_REPETITION_IN_BOUNDS,
+ transmute::CROSSPOINTER_TRANSMUTE,
+ transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
+ transmute::TRANSMUTE_BYTES_TO_STR,
+ transmute::TRANSMUTE_FLOAT_TO_INT,
+ transmute::TRANSMUTE_INT_TO_BOOL,
+ transmute::TRANSMUTE_INT_TO_CHAR,
+ transmute::TRANSMUTE_INT_TO_FLOAT,
+ transmute::TRANSMUTE_NUM_TO_BYTES,
+ transmute::TRANSMUTE_PTR_TO_PTR,
+ transmute::TRANSMUTE_PTR_TO_REF,
+ transmute::UNSOUND_COLLECTION_TRANSMUTE,
+ transmute::USELESS_TRANSMUTE,
+ transmute::WRONG_TRANSMUTE,
+ transmuting_null::TRANSMUTING_NULL,
+ try_err::TRY_ERR,
+ types::BORROWED_BOX,
+ types::BOX_COLLECTION,
+ types::LINKEDLIST,
+ types::OPTION_OPTION,
+ types::RC_BUFFER,
+ types::RC_MUTEX,
+ types::REDUNDANT_ALLOCATION,
+ types::TYPE_COMPLEXITY,
+ types::VEC_BOX,
+ undocumented_unsafe_blocks::UNDOCUMENTED_UNSAFE_BLOCKS,
+ undropped_manually_drops::UNDROPPED_MANUALLY_DROPS,
+ unicode::INVISIBLE_CHARACTERS,
+ unicode::NON_ASCII_LITERAL,
+ unicode::UNICODE_NOT_NFC,
+ uninit_vec::UNINIT_VEC,
+ unit_hash::UNIT_HASH,
+ unit_return_expecting_ord::UNIT_RETURN_EXPECTING_ORD,
+ unit_types::LET_UNIT_VALUE,
+ unit_types::UNIT_ARG,
+ unit_types::UNIT_CMP,
+ unnamed_address::FN_ADDRESS_COMPARISONS,
+ unnamed_address::VTABLE_ADDRESS_COMPARISONS,
+ unnecessary_self_imports::UNNECESSARY_SELF_IMPORTS,
+ unnecessary_sort_by::UNNECESSARY_SORT_BY,
+ unnecessary_wraps::UNNECESSARY_WRAPS,
+ unnested_or_patterns::UNNESTED_OR_PATTERNS,
+ unsafe_removed_from_name::UNSAFE_REMOVED_FROM_NAME,
+ unused_async::UNUSED_ASYNC,
+ unused_io_amount::UNUSED_IO_AMOUNT,
+ unused_self::UNUSED_SELF,
+ unused_unit::UNUSED_UNIT,
+ unwrap::PANICKING_UNWRAP,
+ unwrap::UNNECESSARY_UNWRAP,
+ unwrap_in_result::UNWRAP_IN_RESULT,
+ upper_case_acronyms::UPPER_CASE_ACRONYMS,
+ use_self::USE_SELF,
+ useless_conversion::USELESS_CONVERSION,
+ vec::USELESS_VEC,
+ vec_init_then_push::VEC_INIT_THEN_PUSH,
+ vec_resize_to_zero::VEC_RESIZE_TO_ZERO,
+ verbose_file_reads::VERBOSE_FILE_READS,
+ wildcard_dependencies::WILDCARD_DEPENDENCIES,
+ wildcard_imports::ENUM_GLOB_USE,
+ wildcard_imports::WILDCARD_IMPORTS,
+ write::PRINTLN_EMPTY_STRING,
+ write::PRINT_LITERAL,
+ write::PRINT_STDERR,
+ write::PRINT_STDOUT,
+ write::PRINT_WITH_NEWLINE,
+ write::USE_DEBUG,
+ write::WRITELN_EMPTY_STRING,
+ write::WRITE_LITERAL,
+ write::WRITE_WITH_NEWLINE,
+ zero_div_zero::ZERO_DIVIDED_BY_ZERO,
+ zero_sized_map_values::ZERO_SIZED_MAP_VALUES,
+])
--- /dev/null
- store.register_late_pass(|| Box::new(map_clone::MapClone));
+// error-pattern:cargo-clippy
+
+#![feature(binary_heap_into_iter_sorted)]
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(drain_filter)]
+#![feature(iter_intersperse)]
+#![feature(let_else)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![feature(stmt_expr_attributes)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_docs_in_private_items, clippy::must_use_candidate)]
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_data_structures;
+extern crate rustc_driver;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_hir_pretty;
+extern crate rustc_index;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_mir_dataflow;
+extern crate rustc_parse;
+extern crate rustc_parse_format;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+extern crate rustc_typeck;
+
+#[macro_use]
+extern crate clippy_utils;
+
+use clippy_utils::parse_msrv;
+use rustc_data_structures::fx::FxHashSet;
+use rustc_lint::LintId;
+use rustc_session::Session;
+
+/// Macro used to declare a Clippy lint.
+///
+/// Every lint declaration consists of 4 parts:
+///
+/// 1. The documentation, which is used for the website
+/// 2. The `LINT_NAME`. See [lint naming][lint_naming] on lint naming conventions.
+/// 3. The `lint_level`, which is a mapping from *one* of our lint groups to `Allow`, `Warn` or
+/// `Deny`. The lint level here has nothing to do with what lint groups the lint is a part of.
+/// 4. The `description` that contains a short explanation on what's wrong with code where the
+/// lint is triggered.
+///
+/// Currently the categories `style`, `correctness`, `suspicious`, `complexity` and `perf` are
+/// enabled by default. As said in the README.md of this repository, if the lint level mapping
+/// changes, please update README.md.
+///
+/// # Example
+///
+/// ```
+/// #![feature(rustc_private)]
+/// extern crate rustc_session;
+/// use rustc_session::declare_tool_lint;
+/// use clippy_lints::declare_clippy_lint;
+///
+/// declare_clippy_lint! {
+/// /// ### What it does
+/// /// Checks for ... (describe what the lint matches).
+/// ///
+/// /// ### Why is this bad?
+/// /// Supply the reason for linting the code.
+/// ///
+/// /// ### Example
+/// /// ```rust
+/// /// // Bad
+/// /// Insert a short example of code that triggers the lint
+/// ///
+/// /// // Good
+/// /// Insert a short example of improved code that doesn't trigger the lint
+/// /// ```
+/// pub LINT_NAME,
+/// pedantic,
+/// "description"
+/// }
+/// ```
+/// [lint_naming]: https://rust-lang.github.io/rfcs/0344-conventions-galore.html#lints
+#[macro_export]
+macro_rules! declare_clippy_lint {
+ { $(#[$attr:meta])* pub $name:tt, style, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, correctness, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Deny, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, suspicious, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, complexity, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, perf, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, pedantic, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, restriction, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, cargo, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, nursery, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Allow, $description, report_in_external_macro: true
+ }
+ };
+ { $(#[$attr:meta])* pub $name:tt, internal_warn, $description:tt } => {
+ declare_tool_lint! {
+ $(#[$attr])* pub clippy::$name, Warn, $description, report_in_external_macro: true
+ }
+ };
+}
+
+#[cfg(feature = "internal")]
+mod deprecated_lints;
+#[cfg_attr(feature = "internal", allow(clippy::missing_clippy_version_attribute))]
+mod utils;
+
+// begin lints modules, do not remove this comment, it’s used in `update_lints`
+mod absurd_extreme_comparisons;
+mod approx_const;
+mod arithmetic;
+mod as_conversions;
+mod asm_syntax;
+mod assertions_on_constants;
+mod assign_ops;
+mod async_yields_async;
+mod attrs;
+mod await_holding_invalid;
+mod bit_mask;
+mod blacklisted_name;
+mod blocks_in_if_conditions;
+mod bool_assert_comparison;
+mod booleans;
+mod borrow_as_ptr;
+mod bytecount;
+mod cargo_common_metadata;
+mod case_sensitive_file_extension_comparisons;
+mod casts;
+mod checked_conversions;
+mod cognitive_complexity;
+mod collapsible_if;
+mod collapsible_match;
+mod comparison_chain;
+mod copies;
+mod copy_iterator;
+mod create_dir;
+mod dbg_macro;
+mod default;
+mod default_numeric_fallback;
+mod dereference;
+mod derivable_impls;
+mod derive;
+mod disallowed_methods;
+mod disallowed_script_idents;
+mod disallowed_types;
+mod doc;
+mod double_comparison;
+mod double_parens;
+mod drop_forget_ref;
+mod duration_subsec;
+mod else_if_without_else;
+mod empty_enum;
+mod entry;
+mod enum_clike;
+mod enum_variants;
+mod eq_op;
+mod equatable_if_let;
+mod erasing_op;
+mod escape;
+mod eta_reduction;
+mod eval_order_dependence;
+mod excessive_bools;
+mod exhaustive_items;
+mod exit;
+mod explicit_write;
+mod fallible_impl_from;
+mod feature_name;
+mod float_equality_without_abs;
+mod float_literal;
+mod floating_point_arithmetic;
+mod format;
+mod format_args;
+mod formatting;
+mod from_over_into;
+mod from_str_radix_10;
+mod functions;
+mod future_not_send;
+mod get_last_with_len;
+mod identity_op;
+mod if_let_mutex;
+mod if_not_else;
+mod if_then_some_else_none;
+mod implicit_hasher;
+mod implicit_return;
+mod implicit_saturating_sub;
+mod inconsistent_struct_constructor;
+mod index_refutable_slice;
+mod indexing_slicing;
+mod infinite_iter;
+mod inherent_impl;
+mod inherent_to_string;
+mod init_numbered_fields;
+mod inline_fn_without_body;
+mod int_plus_one;
+mod integer_division;
+mod invalid_upcast_comparisons;
+mod items_after_statements;
+mod iter_not_returning_iterator;
+mod large_const_arrays;
+mod large_enum_variant;
+mod large_stack_arrays;
+mod len_zero;
+mod let_if_seq;
+mod let_underscore;
+mod lifetimes;
+mod literal_representation;
+mod loops;
+mod macro_use;
+mod main_recursion;
+mod manual_assert;
+mod manual_async_fn;
+mod manual_bits;
+mod manual_map;
+mod manual_non_exhaustive;
+mod manual_ok_or;
+mod manual_strip;
+mod manual_unwrap_or;
+mod map_clone;
+mod map_err_ignore;
+mod map_unit_fn;
+mod match_on_vec_items;
+mod match_result_ok;
+mod match_str_case_mismatch;
+mod matches;
+mod mem_forget;
+mod mem_replace;
+mod methods;
+mod minmax;
+mod misc;
+mod misc_early;
+mod missing_const_for_fn;
+mod missing_doc;
+mod missing_enforced_import_rename;
+mod missing_inline;
+mod module_style;
+mod modulo_arithmetic;
+mod multiple_crate_versions;
+mod mut_key;
+mod mut_mut;
+mod mut_mutex_lock;
+mod mut_reference;
+mod mutable_debug_assertion;
+mod mutex_atomic;
+mod needless_arbitrary_self_type;
+mod needless_bitwise_bool;
+mod needless_bool;
+mod needless_borrowed_ref;
+mod needless_continue;
+mod needless_for_each;
+mod needless_late_init;
+mod needless_option_as_deref;
+mod needless_pass_by_value;
+mod needless_question_mark;
+mod needless_update;
+mod neg_cmp_op_on_partial_ord;
+mod neg_multiply;
+mod new_without_default;
+mod no_effect;
+mod non_copy_const;
+mod non_expressive_names;
+mod non_octal_unix_permissions;
+mod non_send_fields_in_send_ty;
+mod nonstandard_macro_braces;
+mod octal_escapes;
+mod open_options;
+mod option_env_unwrap;
+mod option_if_let_else;
+mod overflow_check_conditional;
+mod panic_in_result_fn;
+mod panic_unimplemented;
+mod partialeq_ne_impl;
+mod pass_by_ref_or_value;
+mod path_buf_push_overwrite;
+mod pattern_type_mismatch;
+mod precedence;
+mod ptr;
+mod ptr_eq;
+mod ptr_offset_with_cast;
+mod question_mark;
+mod ranges;
+mod redundant_clone;
+mod redundant_closure_call;
+mod redundant_else;
+mod redundant_field_names;
+mod redundant_pub_crate;
+mod redundant_slicing;
+mod redundant_static_lifetimes;
+mod ref_option_ref;
+mod reference;
+mod regex;
+mod repeat_once;
+mod return_self_not_must_use;
+mod returns;
+mod same_name_method;
+mod self_assignment;
+mod self_named_constructors;
+mod semicolon_if_nothing_returned;
+mod serde_api;
+mod shadow;
+mod single_char_lifetime_names;
+mod single_component_path_imports;
+mod size_of_in_element_count;
+mod slow_vector_initialization;
+mod stable_sort_primitive;
+mod strings;
+mod strlen_on_c_strings;
+mod suspicious_operation_groupings;
+mod suspicious_trait_impl;
+mod swap;
+mod tabs_in_doc_comments;
+mod temporary_assignment;
+mod to_digit_is_some;
+mod to_string_in_display;
+mod trailing_empty_array;
+mod trait_bounds;
+mod transmute;
+mod transmuting_null;
+mod try_err;
+mod types;
+mod undocumented_unsafe_blocks;
+mod undropped_manually_drops;
+mod unicode;
+mod uninit_vec;
+mod unit_hash;
+mod unit_return_expecting_ord;
+mod unit_types;
+mod unnamed_address;
+mod unnecessary_self_imports;
+mod unnecessary_sort_by;
+mod unnecessary_wraps;
+mod unnested_or_patterns;
+mod unsafe_removed_from_name;
+mod unused_async;
+mod unused_io_amount;
+mod unused_self;
+mod unused_unit;
+mod unwrap;
+mod unwrap_in_result;
+mod upper_case_acronyms;
+mod use_self;
+mod useless_conversion;
+mod vec;
+mod vec_init_then_push;
+mod vec_resize_to_zero;
+mod verbose_file_reads;
+mod wildcard_dependencies;
+mod wildcard_imports;
+mod write;
+mod zero_div_zero;
+mod zero_sized_map_values;
+// end lints modules, do not remove this comment, it’s used in `update_lints`
+
+pub use crate::utils::conf::Conf;
+use crate::utils::conf::TryConf;
+
+/// Register all pre expansion lints
+///
+/// Pre-expansion lints run before any macro expansion has happened.
+///
+/// Note that due to the architecture of the compiler, currently `cfg_attr` attributes on crate
+/// level (i.e `#![cfg_attr(...)]`) will still be expanded even when using a pre-expansion pass.
+///
+/// Used in `./src/driver.rs`.
+pub fn register_pre_expansion_lints(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ // NOTE: Do not add any more pre-expansion passes. These should be removed eventually.
+
+ let msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
+ sess.err(&format!(
+ "error reading Clippy's configuration file. `{}` is not a valid Rust version",
+ s
+ ));
+ None
+ })
+ });
+
+ store.register_pre_expansion_pass(|| Box::new(write::Write::default()));
+ store.register_pre_expansion_pass(move || Box::new(attrs::EarlyAttributes { msrv }));
+ store.register_pre_expansion_pass(|| Box::new(dbg_macro::DbgMacro));
+}
+
+#[doc(hidden)]
+pub fn read_conf(sess: &Session) -> Conf {
+ let file_name = match utils::conf::lookup_conf_file() {
+ Ok(Some(path)) => path,
+ Ok(None) => return Conf::default(),
+ Err(error) => {
+ sess.struct_err(&format!("error finding Clippy's configuration file: {}", error))
+ .emit();
+ return Conf::default();
+ },
+ };
+
+ let TryConf { conf, errors } = utils::conf::read(&file_name);
+ // all conf errors are non-fatal, we just use the default conf in case of error
+ for error in errors {
+ sess.struct_err(&format!(
+ "error reading Clippy's configuration file `{}`: {}",
+ file_name.display(),
+ error
+ ))
+ .emit();
+ }
+
+ conf
+}
+
+/// Register all lints and lint groups with the rustc plugin registry
+///
+/// Used in `./src/driver.rs`.
+#[allow(clippy::too_many_lines)]
+pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &Conf) {
+ register_removed_non_tool_lints(store);
+
+ include!("lib.deprecated.rs");
+
+ include!("lib.register_lints.rs");
+ include!("lib.register_restriction.rs");
+ include!("lib.register_pedantic.rs");
+
+ #[cfg(feature = "internal")]
+ include!("lib.register_internal.rs");
+
+ include!("lib.register_all.rs");
+ include!("lib.register_style.rs");
+ include!("lib.register_complexity.rs");
+ include!("lib.register_correctness.rs");
+ include!("lib.register_suspicious.rs");
+ include!("lib.register_perf.rs");
+ include!("lib.register_cargo.rs");
+ include!("lib.register_nursery.rs");
+
+ #[cfg(feature = "internal")]
+ {
+ if std::env::var("ENABLE_METADATA_COLLECTION").eq(&Ok("1".to_string())) {
+ store.register_late_pass(|| Box::new(utils::internal_lints::metadata_collector::MetadataCollector::new()));
+ return;
+ }
+ }
+
+ // all the internal lints
+ #[cfg(feature = "internal")]
+ {
+ store.register_early_pass(|| Box::new(utils::internal_lints::ClippyLintsInternal));
+ store.register_early_pass(|| Box::new(utils::internal_lints::ProduceIce));
+ store.register_late_pass(|| Box::new(utils::inspector::DeepCodeInspector));
+ store.register_late_pass(|| Box::new(utils::internal_lints::CollapsibleCalls));
+ store.register_late_pass(|| Box::new(utils::internal_lints::CompilerLintFunctions::new()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::IfChainStyle));
+ store.register_late_pass(|| Box::new(utils::internal_lints::InvalidPaths));
+ store.register_late_pass(|| Box::new(utils::internal_lints::InterningDefinedSymbol::default()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::LintWithoutLintPass::default()));
+ store.register_late_pass(|| Box::new(utils::internal_lints::MatchTypeOnDiagItem));
+ store.register_late_pass(|| Box::new(utils::internal_lints::OuterExpnDataPass));
+ }
+
+ store.register_late_pass(|| Box::new(utils::author::Author));
+ store.register_late_pass(|| Box::new(await_holding_invalid::AwaitHolding));
+ store.register_late_pass(|| Box::new(serde_api::SerdeApi));
+ let vec_box_size_threshold = conf.vec_box_size_threshold;
+ let type_complexity_threshold = conf.type_complexity_threshold;
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ store.register_late_pass(move || {
+ Box::new(types::Types::new(
+ vec_box_size_threshold,
+ type_complexity_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_late_pass(|| Box::new(booleans::NonminimalBool));
+ store.register_late_pass(|| Box::new(needless_bitwise_bool::NeedlessBitwiseBool));
+ store.register_late_pass(|| Box::new(eq_op::EqOp));
+ store.register_late_pass(|| Box::new(enum_clike::UnportableVariant));
+ store.register_late_pass(|| Box::new(float_literal::FloatLiteral));
+ let verbose_bit_mask_threshold = conf.verbose_bit_mask_threshold;
+ store.register_late_pass(move || Box::new(bit_mask::BitMask::new(verbose_bit_mask_threshold)));
+ store.register_late_pass(|| Box::new(ptr::Ptr));
+ store.register_late_pass(|| Box::new(ptr_eq::PtrEq));
+ store.register_late_pass(|| Box::new(needless_bool::NeedlessBool));
+ store.register_late_pass(|| Box::new(needless_option_as_deref::OptionNeedlessDeref));
+ store.register_late_pass(|| Box::new(needless_bool::BoolComparison));
+ store.register_late_pass(|| Box::new(needless_for_each::NeedlessForEach));
+ store.register_late_pass(|| Box::new(misc::MiscLints));
+ store.register_late_pass(|| Box::new(eta_reduction::EtaReduction));
+ store.register_late_pass(|| Box::new(identity_op::IdentityOp));
+ store.register_late_pass(|| Box::new(erasing_op::ErasingOp));
+ store.register_late_pass(|| Box::new(mut_mut::MutMut));
+ store.register_late_pass(|| Box::new(mut_reference::UnnecessaryMutPassed));
+ store.register_late_pass(|| Box::new(len_zero::LenZero));
+ store.register_late_pass(|| Box::new(attrs::Attributes));
+ store.register_late_pass(|| Box::new(blocks_in_if_conditions::BlocksInIfConditions));
+ store.register_late_pass(|| Box::new(collapsible_match::CollapsibleMatch));
+ store.register_late_pass(|| Box::new(unicode::Unicode));
+ store.register_late_pass(|| Box::new(uninit_vec::UninitVec));
+ store.register_late_pass(|| Box::new(unit_hash::UnitHash));
+ store.register_late_pass(|| Box::new(unit_return_expecting_ord::UnitReturnExpectingOrd));
+ store.register_late_pass(|| Box::new(strings::StringAdd));
+ store.register_late_pass(|| Box::new(implicit_return::ImplicitReturn));
+ store.register_late_pass(|| Box::new(implicit_saturating_sub::ImplicitSaturatingSub));
+ store.register_late_pass(|| Box::new(default_numeric_fallback::DefaultNumericFallback));
+ store.register_late_pass(|| Box::new(inconsistent_struct_constructor::InconsistentStructConstructor));
+ store.register_late_pass(|| Box::new(non_octal_unix_permissions::NonOctalUnixPermissions));
+ store.register_early_pass(|| Box::new(unnecessary_self_imports::UnnecessarySelfImports));
+
+ let msrv = conf.msrv.as_ref().and_then(|s| {
+ parse_msrv(s, None, None).or_else(|| {
+ sess.err(&format!(
+ "error reading Clippy's configuration file. `{}` is not a valid Rust version",
+ s
+ ));
+ None
+ })
+ });
+
+ let avoid_breaking_exported_api = conf.avoid_breaking_exported_api;
+ store.register_late_pass(move || Box::new(approx_const::ApproxConstant::new(msrv)));
+ store.register_late_pass(move || Box::new(methods::Methods::new(avoid_breaking_exported_api, msrv)));
+ store.register_late_pass(move || Box::new(matches::Matches::new(msrv)));
+ store.register_early_pass(move || Box::new(manual_non_exhaustive::ManualNonExhaustive::new(msrv)));
+ store.register_late_pass(move || Box::new(manual_strip::ManualStrip::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_static_lifetimes::RedundantStaticLifetimes::new(msrv)));
+ store.register_early_pass(move || Box::new(redundant_field_names::RedundantFieldNames::new(msrv)));
+ store.register_late_pass(move || Box::new(checked_conversions::CheckedConversions::new(msrv)));
+ store.register_late_pass(move || Box::new(mem_replace::MemReplace::new(msrv)));
+ store.register_late_pass(move || Box::new(ranges::Ranges::new(msrv)));
+ store.register_late_pass(move || Box::new(from_over_into::FromOverInto::new(msrv)));
+ store.register_late_pass(move || Box::new(use_self::UseSelf::new(msrv)));
+ store.register_late_pass(move || Box::new(missing_const_for_fn::MissingConstForFn::new(msrv)));
+ store.register_late_pass(move || Box::new(needless_question_mark::NeedlessQuestionMark));
+ store.register_late_pass(move || Box::new(casts::Casts::new(msrv)));
+ store.register_early_pass(move || Box::new(unnested_or_patterns::UnnestedOrPatterns::new(msrv)));
++ store.register_late_pass(move || Box::new(map_clone::MapClone::new(msrv)));
+
+ store.register_late_pass(|| Box::new(size_of_in_element_count::SizeOfInElementCount));
+ store.register_late_pass(|| Box::new(same_name_method::SameNameMethod));
+ let max_suggested_slice_pattern_length = conf.max_suggested_slice_pattern_length;
+ store.register_late_pass(move || {
+ Box::new(index_refutable_slice::IndexRefutableSlice::new(
+ max_suggested_slice_pattern_length,
+ msrv,
+ ))
+ });
- store.register_early_pass(|| Box::new(reference::RefInDeref));
+ store.register_late_pass(|| Box::new(map_err_ignore::MapErrIgnore));
+ store.register_late_pass(|| Box::new(shadow::Shadow::default()));
+ store.register_late_pass(|| Box::new(unit_types::UnitTypes));
+ store.register_late_pass(|| Box::new(loops::Loops));
+ store.register_late_pass(|| Box::new(main_recursion::MainRecursion::default()));
+ store.register_late_pass(|| Box::new(lifetimes::Lifetimes));
+ store.register_late_pass(|| Box::new(entry::HashMapPass));
+ store.register_late_pass(|| Box::new(minmax::MinMaxPass));
+ store.register_late_pass(|| Box::new(open_options::OpenOptions));
+ store.register_late_pass(|| Box::new(zero_div_zero::ZeroDiv));
+ store.register_late_pass(|| Box::new(mutex_atomic::Mutex));
+ store.register_late_pass(|| Box::new(needless_update::NeedlessUpdate));
+ store.register_late_pass(|| Box::new(needless_borrowed_ref::NeedlessBorrowedRef));
+ store.register_late_pass(|| Box::new(no_effect::NoEffect));
+ store.register_late_pass(|| Box::new(temporary_assignment::TemporaryAssignment));
+ store.register_late_pass(|| Box::new(transmute::Transmute));
+ let cognitive_complexity_threshold = conf.cognitive_complexity_threshold;
+ store.register_late_pass(move || {
+ Box::new(cognitive_complexity::CognitiveComplexity::new(
+ cognitive_complexity_threshold,
+ ))
+ });
+ let too_large_for_stack = conf.too_large_for_stack;
+ store.register_late_pass(move || Box::new(escape::BoxedLocal { too_large_for_stack }));
+ store.register_late_pass(move || Box::new(vec::UselessVec { too_large_for_stack }));
+ store.register_late_pass(|| Box::new(panic_unimplemented::PanicUnimplemented));
+ store.register_late_pass(|| Box::new(strings::StringLitAsBytes));
+ store.register_late_pass(|| Box::new(derive::Derive));
+ store.register_late_pass(|| Box::new(derivable_impls::DerivableImpls));
+ store.register_late_pass(|| Box::new(get_last_with_len::GetLastWithLen));
+ store.register_late_pass(|| Box::new(drop_forget_ref::DropForgetRef));
+ store.register_late_pass(|| Box::new(empty_enum::EmptyEnum));
+ store.register_late_pass(|| Box::new(absurd_extreme_comparisons::AbsurdExtremeComparisons));
+ store.register_late_pass(|| Box::new(invalid_upcast_comparisons::InvalidUpcastComparisons));
+ store.register_late_pass(|| Box::new(regex::Regex));
+ store.register_late_pass(|| Box::new(copies::CopyAndPaste));
+ store.register_late_pass(|| Box::new(copy_iterator::CopyIterator));
+ store.register_late_pass(|| Box::new(format::UselessFormat));
+ store.register_late_pass(|| Box::new(swap::Swap));
+ store.register_late_pass(|| Box::new(overflow_check_conditional::OverflowCheckConditional));
+ store.register_late_pass(|| Box::new(new_without_default::NewWithoutDefault::default()));
+ let blacklisted_names = conf.blacklisted_names.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move || Box::new(blacklisted_name::BlacklistedName::new(blacklisted_names.clone())));
+ let too_many_arguments_threshold = conf.too_many_arguments_threshold;
+ let too_many_lines_threshold = conf.too_many_lines_threshold;
+ store.register_late_pass(move || {
+ Box::new(functions::Functions::new(
+ too_many_arguments_threshold,
+ too_many_lines_threshold,
+ ))
+ });
+ let doc_valid_idents = conf.doc_valid_idents.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_late_pass(move || Box::new(doc::DocMarkdown::new(doc_valid_idents.clone())));
+ store.register_late_pass(|| Box::new(neg_multiply::NegMultiply));
+ store.register_late_pass(|| Box::new(mem_forget::MemForget));
+ store.register_late_pass(|| Box::new(arithmetic::Arithmetic::default()));
+ store.register_late_pass(|| Box::new(assign_ops::AssignOps));
+ store.register_late_pass(|| Box::new(let_if_seq::LetIfSeq));
+ store.register_late_pass(|| Box::new(eval_order_dependence::EvalOrderDependence));
+ store.register_late_pass(|| Box::new(missing_doc::MissingDoc::new()));
+ store.register_late_pass(|| Box::new(missing_inline::MissingInline));
+ store.register_late_pass(move || Box::new(exhaustive_items::ExhaustiveItems));
+ store.register_late_pass(|| Box::new(match_result_ok::MatchResultOk));
+ store.register_late_pass(|| Box::new(partialeq_ne_impl::PartialEqNeImpl));
+ store.register_late_pass(|| Box::new(unused_io_amount::UnusedIoAmount));
+ let enum_variant_size_threshold = conf.enum_variant_size_threshold;
+ store.register_late_pass(move || Box::new(large_enum_variant::LargeEnumVariant::new(enum_variant_size_threshold)));
+ store.register_late_pass(|| Box::new(explicit_write::ExplicitWrite));
+ store.register_late_pass(|| Box::new(needless_pass_by_value::NeedlessPassByValue));
+ let pass_by_ref_or_value = pass_by_ref_or_value::PassByRefOrValue::new(
+ conf.trivial_copy_size_limit,
+ conf.pass_by_value_size_limit,
+ conf.avoid_breaking_exported_api,
+ &sess.target,
+ );
+ store.register_late_pass(move || Box::new(pass_by_ref_or_value));
+ store.register_late_pass(|| Box::new(ref_option_ref::RefOptionRef));
+ store.register_late_pass(|| Box::new(try_err::TryErr));
+ store.register_late_pass(|| Box::new(bytecount::ByteCount));
+ store.register_late_pass(|| Box::new(infinite_iter::InfiniteIter));
+ store.register_late_pass(|| Box::new(inline_fn_without_body::InlineFnWithoutBody));
+ store.register_late_pass(|| Box::new(useless_conversion::UselessConversion::default()));
+ store.register_late_pass(|| Box::new(implicit_hasher::ImplicitHasher));
+ store.register_late_pass(|| Box::new(fallible_impl_from::FallibleImplFrom));
+ store.register_late_pass(|| Box::new(double_comparison::DoubleComparisons));
+ store.register_late_pass(|| Box::new(question_mark::QuestionMark));
+ store.register_early_pass(|| Box::new(suspicious_operation_groupings::SuspiciousOperationGroupings));
+ store.register_late_pass(|| Box::new(suspicious_trait_impl::SuspiciousImpl));
+ store.register_late_pass(|| Box::new(map_unit_fn::MapUnit));
+ store.register_late_pass(|| Box::new(inherent_impl::MultipleInherentImpl));
+ store.register_late_pass(|| Box::new(neg_cmp_op_on_partial_ord::NoNegCompOpForPartialOrd));
+ store.register_late_pass(|| Box::new(unwrap::Unwrap));
+ store.register_late_pass(|| Box::new(duration_subsec::DurationSubsec));
+ store.register_late_pass(|| Box::new(indexing_slicing::IndexingSlicing));
+ store.register_late_pass(|| Box::new(non_copy_const::NonCopyConst));
+ store.register_late_pass(|| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
+ store.register_late_pass(|| Box::new(redundant_clone::RedundantClone));
+ store.register_late_pass(|| Box::new(slow_vector_initialization::SlowVectorInit));
+ store.register_late_pass(|| Box::new(unnecessary_sort_by::UnnecessarySortBy));
+ store.register_late_pass(move || Box::new(unnecessary_wraps::UnnecessaryWraps::new(avoid_breaking_exported_api)));
+ store.register_late_pass(|| Box::new(assertions_on_constants::AssertionsOnConstants));
+ store.register_late_pass(|| Box::new(transmuting_null::TransmutingNull));
+ store.register_late_pass(|| Box::new(path_buf_push_overwrite::PathBufPushOverwrite));
+ store.register_late_pass(|| Box::new(integer_division::IntegerDivision));
+ store.register_late_pass(|| Box::new(inherent_to_string::InherentToString));
+ let max_trait_bounds = conf.max_trait_bounds;
+ store.register_late_pass(move || Box::new(trait_bounds::TraitBounds::new(max_trait_bounds)));
+ store.register_late_pass(|| Box::new(comparison_chain::ComparisonChain));
+ store.register_late_pass(|| Box::new(mut_key::MutableKeyType));
+ store.register_late_pass(|| Box::new(modulo_arithmetic::ModuloArithmetic));
+ store.register_early_pass(|| Box::new(reference::DerefAddrOf));
+ store.register_early_pass(|| Box::new(double_parens::DoubleParens));
+ store.register_late_pass(|| Box::new(to_string_in_display::ToStringInDisplay::new()));
+ store.register_early_pass(|| Box::new(unsafe_removed_from_name::UnsafeNameRemoval));
+ store.register_early_pass(|| Box::new(else_if_without_else::ElseIfWithoutElse));
+ store.register_early_pass(|| Box::new(int_plus_one::IntPlusOne));
+ store.register_early_pass(|| Box::new(formatting::Formatting));
+ store.register_early_pass(|| Box::new(misc_early::MiscEarlyLints));
+ store.register_early_pass(|| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_late_pass(|| Box::new(redundant_closure_call::RedundantClosureCall));
+ store.register_early_pass(|| Box::new(unused_unit::UnusedUnit));
+ store.register_late_pass(|| Box::new(returns::Return));
+ store.register_early_pass(|| Box::new(collapsible_if::CollapsibleIf));
+ store.register_early_pass(|| Box::new(items_after_statements::ItemsAfterStatements));
+ store.register_early_pass(|| Box::new(precedence::Precedence));
+ store.register_early_pass(|| Box::new(needless_continue::NeedlessContinue));
+ store.register_early_pass(|| Box::new(redundant_else::RedundantElse));
+ store.register_late_pass(|| Box::new(create_dir::CreateDir));
+ store.register_early_pass(|| Box::new(needless_arbitrary_self_type::NeedlessArbitrarySelfType));
+ let cargo_ignore_publish = conf.cargo_ignore_publish;
+ store.register_late_pass(move || Box::new(cargo_common_metadata::CargoCommonMetadata::new(cargo_ignore_publish)));
+ store.register_late_pass(|| Box::new(multiple_crate_versions::MultipleCrateVersions));
+ store.register_late_pass(|| Box::new(wildcard_dependencies::WildcardDependencies));
+ let literal_representation_lint_fraction_readability = conf.unreadable_literal_lint_fractions;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::LiteralDigitGrouping::new(
+ literal_representation_lint_fraction_readability,
+ ))
+ });
+ let literal_representation_threshold = conf.literal_representation_threshold;
+ store.register_early_pass(move || {
+ Box::new(literal_representation::DecimalLiteralRepresentation::new(
+ literal_representation_threshold,
+ ))
+ });
+ let enum_variant_name_threshold = conf.enum_variant_name_threshold;
+ store.register_late_pass(move || {
+ Box::new(enum_variants::EnumVariantNames::new(
+ enum_variant_name_threshold,
+ avoid_breaking_exported_api,
+ ))
+ });
+ store.register_early_pass(|| Box::new(tabs_in_doc_comments::TabsInDocComments));
+ let upper_case_acronyms_aggressive = conf.upper_case_acronyms_aggressive;
+ store.register_late_pass(move || {
+ Box::new(upper_case_acronyms::UpperCaseAcronyms::new(
+ avoid_breaking_exported_api,
+ upper_case_acronyms_aggressive,
+ ))
+ });
+ store.register_late_pass(|| Box::new(default::Default::default()));
+ store.register_late_pass(|| Box::new(unused_self::UnusedSelf));
+ store.register_late_pass(|| Box::new(mutable_debug_assertion::DebugAssertWithMutCall));
+ store.register_late_pass(|| Box::new(exit::Exit));
+ store.register_late_pass(|| Box::new(to_digit_is_some::ToDigitIsSome));
+ let array_size_threshold = conf.array_size_threshold;
+ store.register_late_pass(move || Box::new(large_stack_arrays::LargeStackArrays::new(array_size_threshold)));
+ store.register_late_pass(move || Box::new(large_const_arrays::LargeConstArrays::new(array_size_threshold)));
+ store.register_late_pass(|| Box::new(floating_point_arithmetic::FloatingPointArithmetic));
+ store.register_early_pass(|| Box::new(as_conversions::AsConversions));
+ store.register_late_pass(|| Box::new(let_underscore::LetUnderscore));
+ store.register_early_pass(|| Box::new(single_component_path_imports::SingleComponentPathImports));
+ let max_fn_params_bools = conf.max_fn_params_bools;
+ let max_struct_bools = conf.max_struct_bools;
+ store.register_early_pass(move || {
+ Box::new(excessive_bools::ExcessiveBools::new(
+ max_struct_bools,
+ max_fn_params_bools,
+ ))
+ });
+ store.register_early_pass(|| Box::new(option_env_unwrap::OptionEnvUnwrap));
+ let warn_on_all_wildcard_imports = conf.warn_on_all_wildcard_imports;
+ store.register_late_pass(move || Box::new(wildcard_imports::WildcardImports::new(warn_on_all_wildcard_imports)));
+ store.register_late_pass(|| Box::new(verbose_file_reads::VerboseFileReads));
+ store.register_late_pass(|| Box::new(redundant_pub_crate::RedundantPubCrate::default()));
+ store.register_late_pass(|| Box::new(unnamed_address::UnnamedAddress));
+ store.register_late_pass(|| Box::new(dereference::Dereferencing::default()));
+ store.register_late_pass(|| Box::new(option_if_let_else::OptionIfLetElse));
+ store.register_late_pass(|| Box::new(future_not_send::FutureNotSend));
+ store.register_late_pass(|| Box::new(if_let_mutex::IfLetMutex));
+ store.register_late_pass(|| Box::new(if_not_else::IfNotElse));
+ store.register_late_pass(|| Box::new(equatable_if_let::PatternEquality));
+ store.register_late_pass(|| Box::new(mut_mutex_lock::MutMutexLock));
+ store.register_late_pass(|| Box::new(match_on_vec_items::MatchOnVecItems));
+ store.register_late_pass(|| Box::new(manual_async_fn::ManualAsyncFn));
+ store.register_late_pass(|| Box::new(vec_resize_to_zero::VecResizeToZero));
+ store.register_late_pass(|| Box::new(panic_in_result_fn::PanicInResultFn));
+ let single_char_binding_names_threshold = conf.single_char_binding_names_threshold;
+ store.register_early_pass(move || {
+ Box::new(non_expressive_names::NonExpressiveNames {
+ single_char_binding_names_threshold,
+ })
+ });
+ let macro_matcher = conf.standard_macro_braces.iter().cloned().collect::<FxHashSet<_>>();
+ store.register_early_pass(move || Box::new(nonstandard_macro_braces::MacroBraces::new(¯o_matcher)));
+ store.register_late_pass(|| Box::new(macro_use::MacroUseImports::default()));
+ store.register_late_pass(|| Box::new(pattern_type_mismatch::PatternTypeMismatch));
+ store.register_late_pass(|| Box::new(stable_sort_primitive::StableSortPrimitive));
+ store.register_late_pass(|| Box::new(repeat_once::RepeatOnce));
+ store.register_late_pass(|| Box::new(unwrap_in_result::UnwrapInResult));
+ store.register_late_pass(|| Box::new(self_assignment::SelfAssignment));
+ store.register_late_pass(|| Box::new(manual_unwrap_or::ManualUnwrapOr));
+ store.register_late_pass(|| Box::new(manual_ok_or::ManualOkOr));
+ store.register_late_pass(|| Box::new(float_equality_without_abs::FloatEqualityWithoutAbs));
+ store.register_late_pass(|| Box::new(semicolon_if_nothing_returned::SemicolonIfNothingReturned));
+ store.register_late_pass(|| Box::new(async_yields_async::AsyncYieldsAsync));
+ let disallowed_methods = conf.disallowed_methods.clone();
+ store.register_late_pass(move || Box::new(disallowed_methods::DisallowedMethods::new(disallowed_methods.clone())));
+ store.register_early_pass(|| Box::new(asm_syntax::InlineAsmX86AttSyntax));
+ store.register_early_pass(|| Box::new(asm_syntax::InlineAsmX86IntelSyntax));
+ store.register_late_pass(|| Box::new(undropped_manually_drops::UndroppedManuallyDrops));
+ store.register_late_pass(|| Box::new(strings::StrToString));
+ store.register_late_pass(|| Box::new(strings::StringToString));
+ store.register_late_pass(|| Box::new(zero_sized_map_values::ZeroSizedMapValues));
+ store.register_late_pass(|| Box::new(vec_init_then_push::VecInitThenPush::default()));
+ store.register_late_pass(|| {
+ Box::new(case_sensitive_file_extension_comparisons::CaseSensitiveFileExtensionComparisons)
+ });
+ store.register_late_pass(|| Box::new(redundant_slicing::RedundantSlicing));
+ store.register_late_pass(|| Box::new(from_str_radix_10::FromStrRadix10));
+ store.register_late_pass(|| Box::new(manual_map::ManualMap));
+ store.register_late_pass(move || Box::new(if_then_some_else_none::IfThenSomeElseNone::new(msrv)));
+ store.register_late_pass(|| Box::new(bool_assert_comparison::BoolAssertComparison));
+ store.register_early_pass(move || Box::new(module_style::ModStyle));
+ store.register_late_pass(|| Box::new(unused_async::UnusedAsync));
+ let disallowed_types = conf.disallowed_types.clone();
+ store.register_late_pass(move || Box::new(disallowed_types::DisallowedTypes::new(disallowed_types.clone())));
+ let import_renames = conf.enforced_import_renames.clone();
+ store.register_late_pass(move || {
+ Box::new(missing_enforced_import_rename::ImportRename::new(
+ import_renames.clone(),
+ ))
+ });
+ let scripts = conf.allowed_scripts.clone();
+ store.register_early_pass(move || Box::new(disallowed_script_idents::DisallowedScriptIdents::new(&scripts)));
+ store.register_late_pass(|| Box::new(strlen_on_c_strings::StrlenOnCStrings));
+ store.register_late_pass(move || Box::new(self_named_constructors::SelfNamedConstructors));
+ store.register_late_pass(move || Box::new(feature_name::FeatureName));
+ store.register_late_pass(move || Box::new(iter_not_returning_iterator::IterNotReturningIterator));
+ store.register_late_pass(move || Box::new(manual_assert::ManualAssert));
+ let enable_raw_pointer_heuristic_for_send = conf.enable_raw_pointer_heuristic_for_send;
+ store.register_late_pass(move || {
+ Box::new(non_send_fields_in_send_ty::NonSendFieldInSendTy::new(
+ enable_raw_pointer_heuristic_for_send,
+ ))
+ });
+ store.register_late_pass(move || Box::new(undocumented_unsafe_blocks::UndocumentedUnsafeBlocks::default()));
+ store.register_late_pass(|| Box::new(match_str_case_mismatch::MatchStrCaseMismatch));
+ store.register_late_pass(move || Box::new(format_args::FormatArgs));
+ store.register_late_pass(|| Box::new(trailing_empty_array::TrailingEmptyArray));
+ store.register_early_pass(|| Box::new(octal_escapes::OctalEscapes));
+ store.register_late_pass(|| Box::new(needless_late_init::NeedlessLateInit));
+ store.register_late_pass(|| Box::new(return_self_not_must_use::ReturnSelfNotMustUse));
+ store.register_late_pass(|| Box::new(init_numbered_fields::NumberedFields));
+ store.register_early_pass(|| Box::new(single_char_lifetime_names::SingleCharLifetimeNames));
+ store.register_late_pass(move || Box::new(borrow_as_ptr::BorrowAsPtr::new(msrv)));
+ store.register_late_pass(move || Box::new(manual_bits::ManualBits::new(msrv)));
+ // add lints here, do not remove this comment, it's used in `new_lint`
+}
+
+#[rustfmt::skip]
+fn register_removed_non_tool_lints(store: &mut rustc_lint::LintStore) {
+ store.register_removed(
+ "should_assert_eq",
+ "`assert!()` will be more flexible with RFC 2011",
+ );
+ store.register_removed(
+ "extend_from_slice",
+ "`.extend_from_slice(_)` is a faster way to extend a Vec by a slice",
+ );
+ store.register_removed(
+ "range_step_by_zero",
+ "`iterator.step_by(0)` panics nowadays",
+ );
+ store.register_removed(
+ "unstable_as_slice",
+ "`Vec::as_slice` has been stabilized in 1.7",
+ );
+ store.register_removed(
+ "unstable_as_mut_slice",
+ "`Vec::as_mut_slice` has been stabilized in 1.7",
+ );
+ store.register_removed(
+ "misaligned_transmute",
+ "this lint has been split into cast_ptr_alignment and transmute_ptr_to_ptr",
+ );
+ store.register_removed(
+ "assign_ops",
+ "using compound assignment operators (e.g., `+=`) is harmless",
+ );
+ store.register_removed(
+ "if_let_redundant_pattern_matching",
+ "this lint has been changed to redundant_pattern_matching",
+ );
+ store.register_removed(
+ "unsafe_vector_initialization",
+ "the replacement suggested by this lint had substantially different behavior",
+ );
+ store.register_removed(
+ "reverse_range_loop",
+ "this lint is now included in reversed_empty_ranges",
+ );
+}
+
+/// Register renamed lints.
+///
+/// Used in `./src/driver.rs`.
+pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
+ // NOTE: when renaming a lint, add a corresponding test to tests/ui/rename.rs
+ ls.register_renamed("clippy::stutter", "clippy::module_name_repetitions");
+ ls.register_renamed("clippy::new_without_default_derive", "clippy::new_without_default");
+ ls.register_renamed("clippy::cyclomatic_complexity", "clippy::cognitive_complexity");
+ ls.register_renamed("clippy::const_static_lifetime", "clippy::redundant_static_lifetimes");
+ ls.register_renamed("clippy::option_and_then_some", "clippy::bind_instead_of_map");
+ ls.register_renamed("clippy::box_vec", "clippy::box_collection");
+ ls.register_renamed("clippy::block_in_if_condition_expr", "clippy::blocks_in_if_conditions");
+ ls.register_renamed("clippy::block_in_if_condition_stmt", "clippy::blocks_in_if_conditions");
+ ls.register_renamed("clippy::option_map_unwrap_or", "clippy::map_unwrap_or");
+ ls.register_renamed("clippy::option_map_unwrap_or_else", "clippy::map_unwrap_or");
+ ls.register_renamed("clippy::result_map_unwrap_or_else", "clippy::map_unwrap_or");
+ ls.register_renamed("clippy::option_unwrap_used", "clippy::unwrap_used");
+ ls.register_renamed("clippy::result_unwrap_used", "clippy::unwrap_used");
+ ls.register_renamed("clippy::option_expect_used", "clippy::expect_used");
+ ls.register_renamed("clippy::result_expect_used", "clippy::expect_used");
+ ls.register_renamed("clippy::for_loop_over_option", "clippy::for_loops_over_fallibles");
+ ls.register_renamed("clippy::for_loop_over_result", "clippy::for_loops_over_fallibles");
+ ls.register_renamed("clippy::identity_conversion", "clippy::useless_conversion");
+ ls.register_renamed("clippy::zero_width_space", "clippy::invisible_characters");
+ ls.register_renamed("clippy::single_char_push_str", "clippy::single_char_add_str");
+ ls.register_renamed("clippy::if_let_some_result", "clippy::match_result_ok");
+ ls.register_renamed("clippy::disallowed_type", "clippy::disallowed_types");
+ ls.register_renamed("clippy::disallowed_method", "clippy::disallowed_methods");
++ ls.register_renamed("clippy::ref_in_deref", "clippy::needless_borrow");
+
+ // uplifted lints
+ ls.register_renamed("clippy::invalid_ref", "invalid_value");
+ ls.register_renamed("clippy::into_iter_on_array", "array_into_iter");
+ ls.register_renamed("clippy::unused_label", "unused_labels");
+ ls.register_renamed("clippy::drop_bounds", "drop_bounds");
+ ls.register_renamed("clippy::temporary_cstring_as_ptr", "temporary_cstring_as_ptr");
+ ls.register_renamed("clippy::panic_params", "non_fmt_panics");
+ ls.register_renamed("clippy::unknown_clippy_lints", "unknown_lints");
+ ls.register_renamed("clippy::invalid_atomic_ordering", "invalid_atomic_ordering");
+ ls.register_renamed("clippy::mem_discriminant_non_enum", "enum_intrinsics_non_enums");
+}
+
+// only exists to let the dogfood integration test works.
+// Don't run clippy as an executable directly
+#[allow(dead_code)]
+fn main() {
+ panic!("Please use the cargo-clippy executable");
+}
--- /dev/null
- use rustc_span::symbol::{kw, Symbol};
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::trait_ref_of_method;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_hir::intravisit::{
+ walk_fn_decl, walk_generic_param, walk_generics, walk_item, walk_param_bound, walk_poly_trait_ref, walk_ty, Visitor,
+};
+use rustc_hir::FnRetTy::Return;
+use rustc_hir::{
+ BareFnTy, BodyId, FnDecl, GenericArg, GenericBound, GenericParam, GenericParamKind, Generics, ImplItem,
+ ImplItemKind, Item, ItemKind, LangItem, Lifetime, LifetimeName, ParamName, PolyTraitRef, TraitBoundModifier,
+ TraitFn, TraitItem, TraitItemKind, Ty, TyKind, WhereClause, WherePredicate,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
- check_fn_inner(cx, sig.decl, Some(id), generics, item.span, true);
++use rustc_span::symbol::{kw, Ident, Symbol};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for lifetime annotations which can be removed by
+ /// relying on lifetime elision.
+ ///
+ /// ### Why is this bad?
+ /// The additional lifetimes make the code look more
+ /// complicated, while there is nothing out of the ordinary going on. Removing
+ /// them leads to more readable code.
+ ///
+ /// ### Known problems
+ /// - We bail out if the function has a `where` clause where lifetimes
+ /// are mentioned due to potential false positives.
+ /// - Lifetime bounds such as `impl Foo + 'a` and `T: 'a` must be elided with the
+ /// placeholder notation `'_` because the fully elided notation leaves the type bound to `'static`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad: unnecessary lifetime annotations
+ /// fn in_and_out<'a>(x: &'a u8, y: u8) -> &'a u8 {
+ /// x
+ /// }
+ ///
+ /// // Good
+ /// fn elided(x: &u8, y: u8) -> &u8 {
+ /// x
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEEDLESS_LIFETIMES,
+ complexity,
+ "using explicit lifetimes for references in function arguments when elision rules \
+ would allow omitting them"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for lifetimes in generics that are never used
+ /// anywhere else.
+ ///
+ /// ### Why is this bad?
+ /// The additional lifetimes make the code look more
+ /// complicated, while there is nothing out of the ordinary going on. Removing
+ /// them leads to more readable code.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad: unnecessary lifetimes
+ /// fn unused_lifetime<'a>(x: u8) {
+ /// // ..
+ /// }
+ ///
+ /// // Good
+ /// fn no_lifetime(x: u8) {
+ /// // ...
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXTRA_UNUSED_LIFETIMES,
+ complexity,
+ "unused lifetimes in function definitions"
+}
+
+declare_lint_pass!(Lifetimes => [NEEDLESS_LIFETIMES, EXTRA_UNUSED_LIFETIMES]);
+
+impl<'tcx> LateLintPass<'tcx> for Lifetimes {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if let ItemKind::Fn(ref sig, ref generics, id) = item.kind {
- let body = match *body {
- TraitFn::Required(_) => None,
- TraitFn::Provided(id) => Some(id),
++ check_fn_inner(cx, sig.decl, Some(id), None, generics, item.span, true);
+ }
+ }
+
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
+ if let ImplItemKind::Fn(ref sig, id) = item.kind {
+ let report_extra_lifetimes = trait_ref_of_method(cx, item.def_id).is_none();
+ check_fn_inner(
+ cx,
+ sig.decl,
+ Some(id),
++ None,
+ &item.generics,
+ item.span,
+ report_extra_lifetimes,
+ );
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if let TraitItemKind::Fn(ref sig, ref body) = item.kind {
- check_fn_inner(cx, sig.decl, body, &item.generics, item.span, true);
++ let (body, trait_sig) = match *body {
++ TraitFn::Required(sig) => (None, Some(sig)),
++ TraitFn::Provided(id) => (Some(id), None),
+ };
- if could_use_elision(cx, decl, body, generics.params) {
++ check_fn_inner(cx, sig.decl, body, trait_sig, &item.generics, item.span, true);
+ }
+ }
+}
+
+/// The lifetime of a &-reference.
+#[derive(PartialEq, Eq, Hash, Debug, Clone)]
+enum RefLt {
+ Unnamed,
+ Static,
+ Named(Symbol),
+}
+
+fn check_fn_inner<'tcx>(
+ cx: &LateContext<'tcx>,
+ decl: &'tcx FnDecl<'_>,
+ body: Option<BodyId>,
++ trait_sig: Option<&[Ident]>,
+ generics: &'tcx Generics<'_>,
+ span: Span,
+ report_extra_lifetimes: bool,
+) {
+ if span.from_expansion() || has_where_lifetimes(cx, &generics.where_clause) {
+ return;
+ }
+
+ let types = generics
+ .params
+ .iter()
+ .filter(|param| matches!(param.kind, GenericParamKind::Type { .. }));
+ for typ in types {
+ for bound in typ.bounds {
+ let mut visitor = RefVisitor::new(cx);
+ walk_param_bound(&mut visitor, bound);
+ if visitor.lts.iter().any(|lt| matches!(lt, RefLt::Named(_))) {
+ return;
+ }
+ if let GenericBound::Trait(ref trait_ref, _) = *bound {
+ let params = &trait_ref
+ .trait_ref
+ .path
+ .segments
+ .last()
+ .expect("a path must have at least one segment")
+ .args;
+ if let Some(params) = *params {
+ let lifetimes = params.args.iter().filter_map(|arg| match arg {
+ GenericArg::Lifetime(lt) => Some(lt),
+ _ => None,
+ });
+ for bound in lifetimes {
+ if bound.name != LifetimeName::Static && !bound.is_elided() {
+ return;
+ }
+ }
+ }
+ }
+ }
+ }
- checker.visit_expr(&cx.tcx.hir().body(body_id).value);
++ if could_use_elision(cx, decl, body, trait_sig, generics.params) {
+ span_lint(
+ cx,
+ NEEDLESS_LIFETIMES,
+ span.with_hi(decl.output.span().hi()),
+ "explicit lifetimes given in parameter types where they could be elided \
+ (or replaced with `'_` if needed by type declaration)",
+ );
+ }
+ if report_extra_lifetimes {
+ self::report_extra_lifetimes(cx, decl, generics);
+ }
+}
+
++// elision doesn't work for explicit self types, see rust-lang/rust#69064
++fn explicit_self_type<'tcx>(cx: &LateContext<'tcx>, func: &FnDecl<'tcx>, ident: Option<Ident>) -> bool {
++ if_chain! {
++ if let Some(ident) = ident;
++ if ident.name == kw::SelfLower;
++ if !func.implicit_self.has_implicit_self();
++
++ if let Some(self_ty) = func.inputs.first();
++ then {
++ let mut visitor = RefVisitor::new(cx);
++ visitor.visit_ty(self_ty);
++
++ !visitor.all_lts().is_empty()
++ }
++ else {
++ false
++ }
++ }
++}
++
+fn could_use_elision<'tcx>(
+ cx: &LateContext<'tcx>,
+ func: &'tcx FnDecl<'_>,
+ body: Option<BodyId>,
++ trait_sig: Option<&[Ident]>,
+ named_generics: &'tcx [GenericParam<'_>],
+) -> bool {
+ // There are two scenarios where elision works:
+ // * no output references, all input references have different LT
+ // * output references, exactly one input reference with same LT
+ // All lifetimes must be unnamed, 'static or defined without bounds on the
+ // level of the current item.
+
+ // check named LTs
+ let allowed_lts = allowed_lts_from(named_generics);
+
+ // these will collect all the lifetimes for references in arg/return types
+ let mut input_visitor = RefVisitor::new(cx);
+ let mut output_visitor = RefVisitor::new(cx);
+
+ // extract lifetimes in input argument types
+ for arg in func.inputs {
+ input_visitor.visit_ty(arg);
+ }
+ // extract lifetimes in output type
+ if let Return(ty) = func.output {
+ output_visitor.visit_ty(ty);
+ }
+ for lt in named_generics {
+ input_visitor.visit_generic_param(lt);
+ }
+
+ if input_visitor.abort() || output_visitor.abort() {
+ return false;
+ }
+
+ if allowed_lts
+ .intersection(
+ &input_visitor
+ .nested_elision_site_lts
+ .iter()
+ .chain(output_visitor.nested_elision_site_lts.iter())
+ .cloned()
+ .filter(|v| matches!(v, RefLt::Named(_)))
+ .collect(),
+ )
+ .next()
+ .is_some()
+ {
+ return false;
+ }
+
+ let input_lts = input_visitor.lts;
+ let output_lts = output_visitor.lts;
+
++ if let Some(trait_sig) = trait_sig {
++ if explicit_self_type(cx, func, trait_sig.first().copied()) {
++ return false;
++ }
++ }
++
+ if let Some(body_id) = body {
++ let body = cx.tcx.hir().body(body_id);
++
++ let first_ident = body.params.first().and_then(|param| param.pat.simple_ident());
++ if explicit_self_type(cx, func, first_ident) {
++ return false;
++ }
++
+ let mut checker = BodyLifetimeChecker {
+ lifetimes_used_in_body: false,
+ };
++ checker.visit_expr(&body.value);
+ if checker.lifetimes_used_in_body {
+ return false;
+ }
+ }
+
+ // check for lifetimes from higher scopes
+ for lt in input_lts.iter().chain(output_lts.iter()) {
+ if !allowed_lts.contains(lt) {
+ return false;
+ }
+ }
+
+ // no input lifetimes? easy case!
+ if input_lts.is_empty() {
+ false
+ } else if output_lts.is_empty() {
+ // no output lifetimes, check distinctness of input lifetimes
+
+ // only unnamed and static, ok
+ let unnamed_and_static = input_lts.iter().all(|lt| *lt == RefLt::Unnamed || *lt == RefLt::Static);
+ if unnamed_and_static {
+ return false;
+ }
+ // we have no output reference, so we only need all distinct lifetimes
+ input_lts.len() == unique_lifetimes(&input_lts)
+ } else {
+ // we have output references, so we need one input reference,
+ // and all output lifetimes must be the same
+ if unique_lifetimes(&output_lts) > 1 {
+ return false;
+ }
+ if input_lts.len() == 1 {
+ match (&input_lts[0], &output_lts[0]) {
+ (&RefLt::Named(n1), &RefLt::Named(n2)) if n1 == n2 => true,
+ (&RefLt::Named(_), &RefLt::Unnamed) => true,
+ _ => false, /* already elided, different named lifetimes
+ * or something static going on */
+ }
+ } else {
+ false
+ }
+ }
+}
+
+fn allowed_lts_from(named_generics: &[GenericParam<'_>]) -> FxHashSet<RefLt> {
+ let mut allowed_lts = FxHashSet::default();
+ for par in named_generics.iter() {
+ if let GenericParamKind::Lifetime { .. } = par.kind {
+ if par.bounds.is_empty() {
+ allowed_lts.insert(RefLt::Named(par.name.ident().name));
+ }
+ }
+ }
+ allowed_lts.insert(RefLt::Unnamed);
+ allowed_lts.insert(RefLt::Static);
+ allowed_lts
+}
+
+/// Number of unique lifetimes in the given vector.
+#[must_use]
+fn unique_lifetimes(lts: &[RefLt]) -> usize {
+ lts.iter().collect::<FxHashSet<_>>().len()
+}
+
+const CLOSURE_TRAIT_BOUNDS: [LangItem; 3] = [LangItem::Fn, LangItem::FnMut, LangItem::FnOnce];
+
+/// A visitor usable for `rustc_front::visit::walk_ty()`.
+struct RefVisitor<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ lts: Vec<RefLt>,
+ nested_elision_site_lts: Vec<RefLt>,
+ unelided_trait_object_lifetime: bool,
+}
+
+impl<'a, 'tcx> RefVisitor<'a, 'tcx> {
+ fn new(cx: &'a LateContext<'tcx>) -> Self {
+ Self {
+ cx,
+ lts: Vec::new(),
+ nested_elision_site_lts: Vec::new(),
+ unelided_trait_object_lifetime: false,
+ }
+ }
+
+ fn record(&mut self, lifetime: &Option<Lifetime>) {
+ if let Some(ref lt) = *lifetime {
+ if lt.name == LifetimeName::Static {
+ self.lts.push(RefLt::Static);
+ } else if let LifetimeName::Param(ParamName::Fresh(_)) = lt.name {
+ // Fresh lifetimes generated should be ignored.
+ } else if lt.is_elided() {
+ self.lts.push(RefLt::Unnamed);
+ } else {
+ self.lts.push(RefLt::Named(lt.name.ident().name));
+ }
+ } else {
+ self.lts.push(RefLt::Unnamed);
+ }
+ }
+
+ fn all_lts(&self) -> Vec<RefLt> {
+ self.lts
+ .iter()
+ .chain(self.nested_elision_site_lts.iter())
+ .cloned()
+ .collect::<Vec<_>>()
+ }
+
+ fn abort(&self) -> bool {
+ self.unelided_trait_object_lifetime
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for RefVisitor<'a, 'tcx> {
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ self.record(&Some(*lifetime));
+ }
+
+ fn visit_poly_trait_ref(&mut self, poly_tref: &'tcx PolyTraitRef<'tcx>, tbm: TraitBoundModifier) {
+ let trait_ref = &poly_tref.trait_ref;
+ if CLOSURE_TRAIT_BOUNDS.iter().any(|&item| {
+ self.cx
+ .tcx
+ .lang_items()
+ .require(item)
+ .map_or(false, |id| Some(id) == trait_ref.trait_def_id())
+ }) {
+ let mut sub_visitor = RefVisitor::new(self.cx);
+ sub_visitor.visit_trait_ref(trait_ref);
+ self.nested_elision_site_lts.append(&mut sub_visitor.all_lts());
+ } else {
+ walk_poly_trait_ref(self, poly_tref, tbm);
+ }
+ }
+
+ fn visit_ty(&mut self, ty: &'tcx Ty<'_>) {
+ match ty.kind {
+ TyKind::OpaqueDef(item, bounds) => {
+ let map = self.cx.tcx.hir();
+ let item = map.item(item);
+ walk_item(self, item);
+ walk_ty(self, ty);
+ self.lts.extend(bounds.iter().filter_map(|bound| match bound {
+ GenericArg::Lifetime(l) => Some(RefLt::Named(l.name.ident().name)),
+ _ => None,
+ }));
+ },
+ TyKind::BareFn(&BareFnTy { decl, .. }) => {
+ let mut sub_visitor = RefVisitor::new(self.cx);
+ sub_visitor.visit_fn_decl(decl);
+ self.nested_elision_site_lts.append(&mut sub_visitor.all_lts());
+ return;
+ },
+ TyKind::TraitObject(bounds, ref lt, _) => {
+ if !lt.is_elided() {
+ self.unelided_trait_object_lifetime = true;
+ }
+ for bound in bounds {
+ self.visit_poly_trait_ref(bound, TraitBoundModifier::None);
+ }
+ return;
+ },
+ _ => (),
+ }
+ walk_ty(self, ty);
+ }
+}
+
+/// Are any lifetimes mentioned in the `where` clause? If so, we don't try to
+/// reason about elision.
+fn has_where_lifetimes<'tcx>(cx: &LateContext<'tcx>, where_clause: &'tcx WhereClause<'_>) -> bool {
+ for predicate in where_clause.predicates {
+ match *predicate {
+ WherePredicate::RegionPredicate(..) => return true,
+ WherePredicate::BoundPredicate(ref pred) => {
+ // a predicate like F: Trait or F: for<'a> Trait<'a>
+ let mut visitor = RefVisitor::new(cx);
+ // walk the type F, it may not contain LT refs
+ walk_ty(&mut visitor, pred.bounded_ty);
+ if !visitor.all_lts().is_empty() {
+ return true;
+ }
+ // if the bounds define new lifetimes, they are fine to occur
+ let allowed_lts = allowed_lts_from(pred.bound_generic_params);
+ // now walk the bounds
+ for bound in pred.bounds.iter() {
+ walk_param_bound(&mut visitor, bound);
+ }
+ // and check that all lifetimes are allowed
+ if visitor.all_lts().iter().any(|it| !allowed_lts.contains(it)) {
+ return true;
+ }
+ },
+ WherePredicate::EqPredicate(ref pred) => {
+ let mut visitor = RefVisitor::new(cx);
+ walk_ty(&mut visitor, pred.lhs_ty);
+ walk_ty(&mut visitor, pred.rhs_ty);
+ if !visitor.lts.is_empty() {
+ return true;
+ }
+ },
+ }
+ }
+ false
+}
+
+struct LifetimeChecker {
+ map: FxHashMap<Symbol, Span>,
+}
+
+impl<'tcx> Visitor<'tcx> for LifetimeChecker {
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ self.map.remove(&lifetime.name.ident().name);
+ }
+
+ fn visit_generic_param(&mut self, param: &'tcx GenericParam<'_>) {
+ // don't actually visit `<'a>` or `<'a: 'b>`
+ // we've already visited the `'a` declarations and
+ // don't want to spuriously remove them
+ // `'b` in `'a: 'b` is useless unless used elsewhere in
+ // a non-lifetime bound
+ if let GenericParamKind::Type { .. } = param.kind {
+ walk_generic_param(self, param);
+ }
+ }
+}
+
+fn report_extra_lifetimes<'tcx>(cx: &LateContext<'tcx>, func: &'tcx FnDecl<'_>, generics: &'tcx Generics<'_>) {
+ let hs = generics
+ .params
+ .iter()
+ .filter_map(|par| match par.kind {
+ GenericParamKind::Lifetime { .. } => Some((par.name.ident().name, par.span)),
+ _ => None,
+ })
+ .collect();
+ let mut checker = LifetimeChecker { map: hs };
+
+ walk_generics(&mut checker, generics);
+ walk_fn_decl(&mut checker, func);
+
+ for &v in checker.map.values() {
+ span_lint(
+ cx,
+ EXTRA_UNUSED_LIFETIMES,
+ v,
+ "this lifetime isn't used in the function definition",
+ );
+ }
+}
+
+struct BodyLifetimeChecker {
+ lifetimes_used_in_body: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for BodyLifetimeChecker {
+ // for lifetimes as parameters of generics
+ fn visit_lifetime(&mut self, lifetime: &'tcx Lifetime) {
+ if lifetime.name.ident().name != kw::Empty && lifetime.name.ident().name != kw::StaticLifetime {
+ self.lifetimes_used_in_body = true;
+ }
+ }
+}
--- /dev/null
- Term, AsyncGeneratorKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, GeneratorKind, GenericArg, GenericBound, HirId,
- IsAsync, ItemKind, LifetimeName, TraitRef, Ty, TyKind, TypeBindingKind,
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::match_function_call;
+use clippy_utils::paths::FUTURE_FROM_GENERATOR;
+use clippy_utils::source::{position_before_rarrow, snippet_block, snippet_opt};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{
++ AsyncGeneratorKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, GeneratorKind, GenericArg, GenericBound, HirId,
++ IsAsync, ItemKind, LifetimeName, Term, TraitRef, Ty, TyKind, TypeBindingKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// It checks for manual implementations of `async` functions.
+ ///
+ /// ### Why is this bad?
+ /// It's more idiomatic to use the dedicated syntax.
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::future::Future;
+ ///
+ /// fn foo() -> impl Future<Output = i32> { async { 42 } }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// async fn foo() -> i32 { 42 }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MANUAL_ASYNC_FN,
+ style,
+ "manual implementations of `async` functions can be simplified using the dedicated syntax"
+}
+
+declare_lint_pass!(ManualAsyncFn => [MANUAL_ASYNC_FN]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn {
+ fn check_fn(
+ &mut self,
+ cx: &LateContext<'tcx>,
+ kind: FnKind<'tcx>,
+ decl: &'tcx FnDecl<'_>,
+ body: &'tcx Body<'_>,
+ span: Span,
+ _: HirId,
+ ) {
+ if_chain! {
+ if let Some(header) = kind.header();
+ if header.asyncness == IsAsync::NotAsync;
+ // Check that this function returns `impl Future`
+ if let FnRetTy::Return(ret_ty) = decl.output;
+ if let Some((trait_ref, output_lifetimes)) = future_trait_ref(cx, ret_ty);
+ if let Some(output) = future_output_ty(trait_ref);
+ if captures_all_lifetimes(decl.inputs, &output_lifetimes);
+ // Check that the body of the function consists of one async block
+ if let ExprKind::Block(block, _) = body.value.kind;
+ if block.stmts.is_empty();
+ if let Some(closure_body) = desugared_async_block(cx, block);
+ then {
+ let header_span = span.with_hi(ret_ty.span.hi());
+
+ span_lint_and_then(
+ cx,
+ MANUAL_ASYNC_FN,
+ header_span,
+ "this function can be simplified using the `async fn` syntax",
+ |diag| {
+ if_chain! {
+ if let Some(header_snip) = snippet_opt(cx, header_span);
+ if let Some(ret_pos) = position_before_rarrow(&header_snip);
+ if let Some((ret_sugg, ret_snip)) = suggested_ret(cx, output);
+ then {
+ let help = format!("make the function `async` and {}", ret_sugg);
+ diag.span_suggestion(
+ header_span,
+ &help,
+ format!("async {}{}", &header_snip[..ret_pos], ret_snip),
+ Applicability::MachineApplicable
+ );
+
+ let body_snip = snippet_block(cx, closure_body.value.span, "..", Some(block.span));
+ diag.span_suggestion(
+ block.span,
+ "move the body of the async block to the enclosing function",
+ body_snip.to_string(),
+ Applicability::MachineApplicable
+ );
+ }
+ }
+ },
+ );
+ }
+ }
+ }
+}
+
+fn future_trait_ref<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: &'tcx Ty<'tcx>,
+) -> Option<(&'tcx TraitRef<'tcx>, Vec<LifetimeName>)> {
+ if_chain! {
+ if let TyKind::OpaqueDef(item_id, bounds) = ty.kind;
+ let item = cx.tcx.hir().item(item_id);
+ if let ItemKind::OpaqueTy(opaque) = &item.kind;
+ if let Some(trait_ref) = opaque.bounds.iter().find_map(|bound| {
+ if let GenericBound::Trait(poly, _) = bound {
+ Some(&poly.trait_ref)
+ } else {
+ None
+ }
+ });
+ if trait_ref.trait_def_id() == cx.tcx.lang_items().future_trait();
+ then {
+ let output_lifetimes = bounds
+ .iter()
+ .filter_map(|bound| {
+ if let GenericArg::Lifetime(lt) = bound {
+ Some(lt.name)
+ } else {
+ None
+ }
+ })
+ .collect();
+
+ return Some((trait_ref, output_lifetimes));
+ }
+ }
+
+ None
+}
+
+fn future_output_ty<'tcx>(trait_ref: &'tcx TraitRef<'tcx>) -> Option<&'tcx Ty<'tcx>> {
+ if_chain! {
+ if let Some(segment) = trait_ref.path.segments.last();
+ if let Some(args) = segment.args;
+ if args.bindings.len() == 1;
+ let binding = &args.bindings[0];
+ if binding.ident.name == sym::Output;
+ if let TypeBindingKind::Equality{term: Term::Ty(output)} = binding.kind;
+ then {
+ return Some(output)
+ }
+ }
+
+ None
+}
+
+fn captures_all_lifetimes(inputs: &[Ty<'_>], output_lifetimes: &[LifetimeName]) -> bool {
+ let input_lifetimes: Vec<LifetimeName> = inputs
+ .iter()
+ .filter_map(|ty| {
+ if let TyKind::Rptr(lt, _) = ty.kind {
+ Some(lt.name)
+ } else {
+ None
+ }
+ })
+ .collect();
+
+ // The lint should trigger in one of these cases:
+ // - There are no input lifetimes
+ // - There's only one output lifetime bound using `+ '_`
+ // - All input lifetimes are explicitly bound to the output
+ input_lifetimes.is_empty()
+ || (output_lifetimes.len() == 1 && matches!(output_lifetimes[0], LifetimeName::Underscore))
+ || input_lifetimes
+ .iter()
+ .all(|in_lt| output_lifetimes.iter().any(|out_lt| in_lt == out_lt))
+}
+
+fn desugared_async_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'tcx>) -> Option<&'tcx Body<'tcx>> {
+ if_chain! {
+ if let Some(block_expr) = block.expr;
+ if let Some(args) = match_function_call(cx, block_expr, &FUTURE_FROM_GENERATOR);
+ if args.len() == 1;
+ if let Expr{kind: ExprKind::Closure(_, _, body_id, ..), ..} = args[0];
+ let closure_body = cx.tcx.hir().body(body_id);
+ if closure_body.generator_kind == Some(GeneratorKind::Async(AsyncGeneratorKind::Block));
+ then {
+ return Some(closure_body);
+ }
+ }
+
+ None
+}
+
+fn suggested_ret(cx: &LateContext<'_>, output: &Ty<'_>) -> Option<(&'static str, String)> {
+ match output.kind {
+ TyKind::Tup(tys) if tys.is_empty() => {
+ let sugg = "remove the return type";
+ Some((sugg, "".into()))
+ },
+ _ => {
+ let sugg = "return the output of the future directly";
+ snippet_opt(cx, output.span).map(|snip| (sugg, format!(" -> {}", snip)))
+ },
+ }
+}
--- /dev/null
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_opt;
+use clippy_utils::{match_def_path, meets_msrv, msrvs, paths};
+use rustc_ast::ast::LitKind;
+use rustc_errors::Applicability;
+use rustc_hir::{BinOpKind, Expr, ExprKind, GenericArg, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for uses of `std::mem::size_of::<T>() * 8` when
+ /// `T::BITS` is available.
+ ///
+ /// ### Why is this bad?
+ /// Can be written as the shorter `T::BITS`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// std::mem::size_of::<usize>() * 8;
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// usize::BITS;
+ /// ```
+ #[clippy::version = "1.60.0"]
+ pub MANUAL_BITS,
+ style,
+ "manual implementation of `size_of::<T>() * 8` can be simplified with `T::BITS`"
+}
+
+#[derive(Clone)]
+pub struct ManualBits {
+ msrv: Option<RustcVersion>,
+}
+
+impl ManualBits {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(ManualBits => [MANUAL_BITS]);
+
+impl<'tcx> LateLintPass<'tcx> for ManualBits {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if !meets_msrv(self.msrv.as_ref(), &msrvs::MANUAL_BITS) {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::Binary(bin_op, left_expr, right_expr) = expr.kind;
+ if let BinOpKind::Mul = &bin_op.node;
+ if let Some((real_ty, resolved_ty, other_expr)) = get_one_size_of_ty(cx, left_expr, right_expr);
+ if matches!(resolved_ty.kind(), ty::Int(_) | ty::Uint(_));
+ if let ExprKind::Lit(lit) = &other_expr.kind;
+ if let LitKind::Int(8, _) = lit.node;
+
+ then {
+ span_lint_and_sugg(
+ cx,
+ MANUAL_BITS,
+ expr.span,
+ "usage of `mem::size_of::<T>()` to obtain the size of `T` in bits",
+ "consider using",
+ format!("{}::BITS", snippet_opt(cx, real_ty.span).unwrap()),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
++
++ extract_msrv_attr!(LateContext);
+}
+
+fn get_one_size_of_ty<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr1: &'tcx Expr<'_>,
+ expr2: &'tcx Expr<'_>,
+) -> Option<(&'tcx rustc_hir::Ty<'tcx>, Ty<'tcx>, &'tcx Expr<'tcx>)> {
+ match (get_size_of_ty(cx, expr1), get_size_of_ty(cx, expr2)) {
+ (Some((real_ty, resolved_ty)), None) => Some((real_ty, resolved_ty, expr2)),
+ (None, Some((real_ty, resolved_ty))) => Some((real_ty, resolved_ty, expr1)),
+ _ => None,
+ }
+}
+
+fn get_size_of_ty<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<(&'tcx rustc_hir::Ty<'tcx>, Ty<'tcx>)> {
+ if_chain! {
+ if let ExprKind::Call(count_func, _func_args) = expr.kind;
+ if let ExprKind::Path(ref count_func_qpath) = count_func.kind;
+
+ if let QPath::Resolved(_, count_func_path) = count_func_qpath;
+ if let Some(segment_zero) = count_func_path.segments.get(0);
+ if let Some(args) = segment_zero.args;
+ if let Some(GenericArg::Type(real_ty)) = args.args.get(0);
+
+ if let Some(def_id) = cx.qpath_res(count_func_qpath, count_func.hir_id).opt_def_id();
+ if match_def_path(cx, def_id, &paths::MEM_SIZE_OF);
+ then {
+ cx.typeck_results().node_substs(count_func.hir_id).types().next().map(|resolved_ty| (real_ty, resolved_ty))
+ } else {
+ None
+ }
+ }
+}
--- /dev/null
- use clippy_utils::{is_trait_method, peel_blocks};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::{is_copy, is_type_diagnostic_item};
- use rustc_session::{declare_lint_pass, declare_tool_lint};
++use clippy_utils::{is_trait_method, meets_msrv, msrvs, peel_blocks};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::mir::Mutability;
+use rustc_middle::ty;
+use rustc_middle::ty::adjustment::Adjust;
- declare_lint_pass!(MapClone => [MAP_CLONE]);
++use rustc_semver::RustcVersion;
++use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `map(|x| x.clone())` or
+ /// dereferencing closures for `Copy` types, on `Iterator` or `Option`,
+ /// and suggests `cloned()` or `copied()` instead
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = vec![42, 43];
+ /// let y = x.iter();
+ /// let z = y.map(|i| *i);
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// let x = vec![42, 43];
+ /// let y = x.iter();
+ /// let z = y.cloned();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MAP_CLONE,
+ style,
+ "using `iterator.map(|x| x.clone())`, or dereferencing closures for `Copy` types"
+}
+
- lint(cx, e.span, args[0].span, true);
++pub struct MapClone {
++ msrv: Option<RustcVersion>,
++}
++
++impl_lint_pass!(MapClone => [MAP_CLONE]);
++
++impl MapClone {
++ pub fn new(msrv: Option<RustcVersion>) -> Self {
++ Self { msrv }
++ }
++}
+
+impl<'tcx> LateLintPass<'tcx> for MapClone {
+ fn check_expr(&mut self, cx: &LateContext<'_>, e: &hir::Expr<'_>) {
+ if e.span.from_expansion() {
+ return;
+ }
+
+ if_chain! {
+ if let hir::ExprKind::MethodCall(method, args, _) = e.kind;
+ if args.len() == 2;
+ if method.ident.name == sym::map;
+ let ty = cx.typeck_results().expr_ty(&args[0]);
+ if is_type_diagnostic_item(cx, ty, sym::Option) || is_trait_method(cx, e, sym::Iterator);
+ if let hir::ExprKind::Closure(_, _, body_id, _, _) = args[1].kind;
+ then {
+ let closure_body = cx.tcx.hir().body(body_id);
+ let closure_expr = peel_blocks(&closure_body.value);
+ match closure_body.params[0].pat.kind {
+ hir::PatKind::Ref(inner, hir::Mutability::Not) => if let hir::PatKind::Binding(
+ hir::BindingAnnotation::Unannotated, .., name, None
+ ) = inner.kind {
+ if ident_eq(name, closure_expr) {
- lint(cx, e.span, args[0].span, true);
++ self.lint_explicit_closure(cx, e.span, args[0].span, true);
+ }
+ },
+ hir::PatKind::Binding(hir::BindingAnnotation::Unannotated, .., name, None) => {
+ match closure_expr.kind {
+ hir::ExprKind::Unary(hir::UnOp::Deref, inner) => {
+ if ident_eq(name, inner) {
+ if let ty::Ref(.., Mutability::Not) = cx.typeck_results().expr_ty(inner).kind() {
- lint(cx, e.span, args[0].span, copy);
++ self.lint_explicit_closure(cx, e.span, args[0].span, true);
+ }
+ }
+ },
+ hir::ExprKind::MethodCall(method, [obj], _) => if_chain! {
+ if ident_eq(name, obj) && method.ident.name == sym::clone;
+ if let Some(fn_id) = cx.typeck_results().type_dependent_def_id(closure_expr.hir_id);
+ if let Some(trait_id) = cx.tcx.trait_of_item(fn_id);
+ if cx.tcx.lang_items().clone_trait().map_or(false, |id| id == trait_id);
+ // no autoderefs
+ if !cx.typeck_results().expr_adjustments(obj).iter()
+ .any(|a| matches!(a.kind, Adjust::Deref(Some(..))));
+ then {
+ let obj_ty = cx.typeck_results().expr_ty(obj);
+ if let ty::Ref(_, ty, mutability) = obj_ty.kind() {
+ if matches!(mutability, Mutability::Not) {
+ let copy = is_copy(cx, ty);
- fn lint(cx: &LateContext<'_>, replace: Span, root: Span, copied: bool) {
- let mut applicability = Applicability::MachineApplicable;
- if copied {
- span_lint_and_sugg(
- cx,
- MAP_CLONE,
- replace,
- "you are using an explicit closure for copying elements",
- "consider calling the dedicated `copied` method",
- format!(
- "{}.copied()",
- snippet_with_applicability(cx, root, "..", &mut applicability)
- ),
- applicability,
- );
- } else {
++ self.lint_explicit_closure(cx, e.span, args[0].span, copy);
+ }
+ } else {
+ lint_needless_cloning(cx, e.span, args[0].span);
+ }
+ }
+ },
+ _ => {},
+ }
+ },
+ _ => {},
+ }
+ }
+ }
+ }
++
++ extract_msrv_attr!(LateContext);
+}
+
+fn ident_eq(name: Ident, path: &hir::Expr<'_>) -> bool {
+ if let hir::ExprKind::Path(hir::QPath::Resolved(None, path)) = path.kind {
+ path.segments.len() == 1 && path.segments[0].ident == name
+ } else {
+ false
+ }
+}
+
+fn lint_needless_cloning(cx: &LateContext<'_>, root: Span, receiver: Span) {
+ span_lint_and_sugg(
+ cx,
+ MAP_CLONE,
+ root.trim_start(receiver).unwrap(),
+ "you are needlessly cloning iterator elements",
+ "remove the `map` call",
+ String::new(),
+ Applicability::MachineApplicable,
+ );
+}
+
- "you are using an explicit closure for cloning elements",
- "consider calling the dedicated `cloned` method",
++impl MapClone {
++ fn lint_explicit_closure(&self, cx: &LateContext<'_>, replace: Span, root: Span, is_copy: bool) {
++ let mut applicability = Applicability::MachineApplicable;
++ let message = if is_copy {
++ "you are using an explicit closure for copying elements"
++ } else {
++ "you are using an explicit closure for cloning elements"
++ };
++ let sugg_method = if is_copy && meets_msrv(self.msrv.as_ref(), &msrvs::ITERATOR_COPIED) {
++ "copied"
++ } else {
++ "cloned"
++ };
++
+ span_lint_and_sugg(
+ cx,
+ MAP_CLONE,
+ replace,
- "{}.cloned()",
- snippet_with_applicability(cx, root, "..", &mut applicability)
++ message,
++ &format!("consider calling the dedicated `{}` method", sugg_method),
+ format!(
++ "{}.{}()",
++ snippet_with_applicability(cx, root, "..", &mut applicability),
++ sugg_method,
+ ),
+ applicability,
+ );
+ }
+}
--- /dev/null
- use rustc_span::sym;
+use clippy_utils::consts::{constant, constant_full_int, miri_to_const, FullInt};
+use clippy_utils::diagnostics::{
+ multispan_sugg, span_lint_and_help, span_lint_and_note, span_lint_and_sugg, span_lint_and_then,
+};
+use clippy_utils::macros::{is_panic, root_macro_call};
+use clippy_utils::source::{expr_block, indent_of, snippet, snippet_block, snippet_opt, snippet_with_applicability};
+use clippy_utils::sugg::Sugg;
+use clippy_utils::ty::{implements_trait, is_type_diagnostic_item, match_type, peel_mid_ty_refs};
+use clippy_utils::visitors::is_local_used;
+use clippy_utils::{
+ get_parent_expr, is_lang_ctor, is_lint_allowed, is_refutable, is_unit_expr, is_wild, meets_msrv, msrvs,
+ path_to_local, path_to_local_id, peel_blocks, peel_hir_pat_refs, peel_n_hir_expr_refs, recurse_or_patterns,
+ strip_pat_refs,
+};
+use clippy_utils::{higher, peel_blocks_with_stmt};
+use clippy_utils::{paths, search_same, SpanlessEq, SpanlessHash};
+use core::iter::{once, ExactSizeIterator};
+use if_chain::if_chain;
+use rustc_ast::ast::{Attribute, LitKind};
+use rustc_errors::Applicability;
+use rustc_hir::def::{CtorKind, DefKind, Res};
+use rustc_hir::LangItem::{OptionNone, OptionSome};
+use rustc_hir::{
+ self as hir, Arm, BindingAnnotation, Block, BorrowKind, Expr, ExprKind, Guard, HirId, Local, MatchSource,
+ Mutability, Node, Pat, PatKind, PathSegment, QPath, RangeEnd, TyKind,
+};
+use rustc_hir::{HirIdMap, HirIdSet};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::{self, Ty, TyS, VariantDef};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::{Span, Spanned};
- let mut ident_bind_name = String::from("_");
++use rustc_span::{sym, symbol::kw};
+use std::cmp::Ordering;
+use std::collections::hash_map::Entry;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with a single arm where an `if let`
+ /// will usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn bar(stool: &str) {}
+ /// # let x = Some("abc");
+ /// // Bad
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => (),
+ /// }
+ ///
+ /// // Good
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH,
+ style,
+ "a `match` statement with a single nontrivial arm (i.e., where the other arm is `_ => {}`) instead of `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches with two arms where an `if let else` will
+ /// usually suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `if let` nests less than a `match`.
+ ///
+ /// ### Known problems
+ /// Personal style preferences may differ.
+ ///
+ /// ### Example
+ /// Using `match`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// match x {
+ /// Some(ref foo) => bar(foo),
+ /// _ => bar(&other_ref),
+ /// }
+ /// ```
+ ///
+ /// Using `if let` with `else`:
+ ///
+ /// ```rust
+ /// # fn bar(foo: &usize) {}
+ /// # let other_ref: usize = 1;
+ /// # let x: Option<&usize> = Some(&1);
+ /// if let Some(ref foo) = x {
+ /// bar(foo);
+ /// } else {
+ /// bar(&other_ref);
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_MATCH_ELSE,
+ pedantic,
+ "a `match` statement with two arms where the second arm's pattern is a placeholder instead of a specific match pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where all arms match a reference,
+ /// suggesting to remove the reference and deref the matched expression
+ /// instead. It also checks for `if let &foo = bar` blocks.
+ ///
+ /// ### Why is this bad?
+ /// It just makes the code less readable. That reference
+ /// destructuring adds nothing to the code.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // Bad
+ /// match x {
+ /// &A(ref y) => foo(y),
+ /// &B => bar(),
+ /// _ => frob(&x),
+ /// }
+ ///
+ /// // Good
+ /// match *x {
+ /// A(ref y) => foo(y),
+ /// B => bar(),
+ /// _ => frob(x),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_REF_PATS,
+ style,
+ "a `match` or `if let` with all arms prefixed with `&` instead of deref-ing the match expression"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches where match expression is a `bool`. It
+ /// suggests to replace the expression with an `if...else` block.
+ ///
+ /// ### Why is this bad?
+ /// It makes the code less readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// match condition {
+ /// true => foo(),
+ /// false => bar(),
+ /// }
+ /// ```
+ /// Use if/else instead:
+ /// ```rust
+ /// # fn foo() {}
+ /// # fn bar() {}
+ /// let condition: bool = true;
+ /// if condition {
+ /// foo();
+ /// } else {
+ /// bar();
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_BOOL,
+ pedantic,
+ "a `match` on a boolean expression instead of an `if..else` block"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for overlapping match arms.
+ ///
+ /// ### Why is this bad?
+ /// It is likely to be an error and if not, makes the code
+ /// less obvious.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = 5;
+ /// match x {
+ /// 1..=10 => println!("1 ... 10"),
+ /// 5..=15 => println!("5 ... 15"),
+ /// _ => (),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_OVERLAPPING_ARM,
+ style,
+ "a `match` with overlapping arms"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for arm which matches all errors with `Err(_)`
+ /// and take drastic actions like `panic!`.
+ ///
+ /// ### Why is this bad?
+ /// It is generally a bad practice, similar to
+ /// catching all exceptions in java with `catch(Exception)`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Result<i32, &str> = Ok(3);
+ /// match x {
+ /// Ok(_) => println!("ok"),
+ /// Err(_) => panic!("err"),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_WILD_ERR_ARM,
+ pedantic,
+ "a `match` with `Err(_)` arm and take drastic actions"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for match which is used to add a reference to an
+ /// `Option` value.
+ ///
+ /// ### Why is this bad?
+ /// Using `as_ref()` or `as_mut()` instead is shorter.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x: Option<()> = None;
+ ///
+ /// // Bad
+ /// let r: Option<&()> = match x {
+ /// None => None,
+ /// Some(ref v) => Some(v),
+ /// };
+ ///
+ /// // Good
+ /// let r: Option<&()> = x.as_ref();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_AS_REF,
+ complexity,
+ "a `match` on an Option value instead of using `as_ref()` or `as_mut`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches using `_`.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect if guards exhaustively cover some
+ /// variants, and also may not use correct path to enum if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A(usize), B(usize) }
+ /// # let x = Foo::B(1);
+ /// // Bad
+ /// match x {
+ /// Foo::A(_) => {},
+ /// _ => {},
+ /// }
+ ///
+ /// // Good
+ /// match x {
+ /// Foo::A(_) => {},
+ /// Foo::B(_) => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.34.0"]
+ pub WILDCARD_ENUM_MATCH_ARM,
+ restriction,
+ "a wildcard enum match arm using `_`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard enum matches for a single variant.
+ ///
+ /// ### Why is this bad?
+ /// New enum variants added by library updates can be missed.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may not use correct path to enum
+ /// if it's not present in the current scope.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # enum Foo { A, B, C }
+ /// # let x = Foo::B;
+ /// // Bad
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// _ => {},
+ /// }
+ ///
+ /// // Good
+ /// match x {
+ /// Foo::A => {},
+ /// Foo::B => {},
+ /// Foo::C => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ pedantic,
+ "a wildcard enum match for a single variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for wildcard pattern used with others patterns in same match arm.
+ ///
+ /// ### Why is this bad?
+ /// Wildcard pattern already covers any other pattern as it will match anyway.
+ /// It makes the code less readable, especially to spot wildcard pattern use in match arm.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// match "foo" {
+ /// "a" => {},
+ /// "bar" | _ => {},
+ /// }
+ ///
+ /// // Good
+ /// match "foo" {
+ /// "a" => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub WILDCARD_IN_OR_PATTERNS,
+ complexity,
+ "a wildcard pattern used with others patterns in same match arm"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for matches being used to destructure a single-variant enum
+ /// or tuple struct where a `let` will suffice.
+ ///
+ /// ### Why is this bad?
+ /// Just readability – `let` doesn't nest, whereas a `match` does.
+ ///
+ /// ### Example
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ ///
+ /// let data = match wrapper {
+ /// Wrapper::Data(i) => i,
+ /// };
+ /// ```
+ ///
+ /// The correct use would be:
+ /// ```rust
+ /// enum Wrapper {
+ /// Data(i32),
+ /// }
+ ///
+ /// let wrapper = Wrapper::Data(42);
+ /// let Wrapper::Data(data) = wrapper;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub INFALLIBLE_DESTRUCTURING_MATCH,
+ style,
+ "a `match` statement with a single infallible arm instead of a `let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for useless match that binds to only one value.
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// Suggested replacements may be incorrect when `match`
+ /// is actually binding temporary value, bringing a 'dropped while borrowed' error.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = 1;
+ /// # let b = 2;
+ ///
+ /// // Bad
+ /// match (a, b) {
+ /// (c, d) => {
+ /// // useless match
+ /// }
+ /// }
+ ///
+ /// // Good
+ /// let (c, d) = (a, b);
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub MATCH_SINGLE_BINDING,
+ complexity,
+ "a match with a single binding instead of using `let` statement"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary '..' pattern binding on struct when all fields are explicitly matched.
+ ///
+ /// ### Why is this bad?
+ /// Correctness and readability. It's like having a wildcard pattern after
+ /// matching all enum variants explicitly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct A { a: i32 }
+ /// let a = A { a: 5 };
+ ///
+ /// // Bad
+ /// match a {
+ /// A { a: 5, .. } => {},
+ /// _ => {},
+ /// }
+ ///
+ /// // Good
+ /// match a {
+ /// A { a: 5 } => {},
+ /// _ => {},
+ /// }
+ /// ```
+ #[clippy::version = "1.43.0"]
+ pub REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ restriction,
+ "a match on a struct that binds all fields but still uses the wildcard pattern"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lint for redundant pattern matching over `Result`, `Option`,
+ /// `std::task::Poll` or `std::net::IpAddr`
+ ///
+ /// ### Why is this bad?
+ /// It's more concise and clear to just use the proper
+ /// utility function
+ ///
+ /// ### Known problems
+ /// This will change the drop order for the matched type. Both `if let` and
+ /// `while let` will drop the value at the end of the block, both `if` and `while` will drop the
+ /// value before entering the block. For most types this change will not matter, but for a few
+ /// types this will not be an acceptable change (e.g. locks). See the
+ /// [reference](https://doc.rust-lang.org/reference/destructors.html#drop-scopes) for more about
+ /// drop order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if let Ok(_) = Ok::<i32, i32>(42) {}
+ /// if let Err(_) = Err::<i32, i32>(42) {}
+ /// if let None = None::<()> {}
+ /// if let Some(_) = Some(42) {}
+ /// if let Poll::Pending = Poll::Pending::<()> {}
+ /// if let Poll::Ready(_) = Poll::Ready(42) {}
+ /// if let IpAddr::V4(_) = IpAddr::V4(Ipv4Addr::LOCALHOST) {}
+ /// if let IpAddr::V6(_) = IpAddr::V6(Ipv6Addr::LOCALHOST) {}
+ /// match Ok::<i32, i32>(42) {
+ /// Ok(_) => true,
+ /// Err(_) => false,
+ /// };
+ /// ```
+ ///
+ /// The more idiomatic use would be:
+ ///
+ /// ```rust
+ /// # use std::task::Poll;
+ /// # use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+ /// if Ok::<i32, i32>(42).is_ok() {}
+ /// if Err::<i32, i32>(42).is_err() {}
+ /// if None::<()>.is_none() {}
+ /// if Some(42).is_some() {}
+ /// if Poll::Pending::<()>.is_pending() {}
+ /// if Poll::Ready(42).is_ready() {}
+ /// if IpAddr::V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
+ /// if IpAddr::V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
+ /// Ok::<i32, i32>(42).is_ok();
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub REDUNDANT_PATTERN_MATCHING,
+ style,
+ "use the proper utility function avoiding an `if let`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` or `if let` expressions producing a
+ /// `bool` that could be written using `matches!`
+ ///
+ /// ### Why is this bad?
+ /// Readability and needless complexity.
+ ///
+ /// ### Known problems
+ /// This lint falsely triggers, if there are arms with
+ /// `cfg` attributes that remove an arm evaluating to `false`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = Some(5);
+ ///
+ /// // Bad
+ /// let a = match x {
+ /// Some(0) => true,
+ /// _ => false,
+ /// };
+ ///
+ /// let a = if let Some(0) = x {
+ /// true
+ /// } else {
+ /// false
+ /// };
+ ///
+ /// // Good
+ /// let a = matches!(x, Some(0));
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub MATCH_LIKE_MATCHES_MACRO,
+ style,
+ "a match that could be written with the matches! macro"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `match` with identical arm bodies.
+ ///
+ /// ### Why is this bad?
+ /// This is probably a copy & paste error. If arm bodies
+ /// are the same on purpose, you can factor them
+ /// [using `|`](https://doc.rust-lang.org/book/patterns.html#multiple-patterns).
+ ///
+ /// ### Known problems
+ /// False positive possible with order dependent `match`
+ /// (see issue
+ /// [#860](https://github.com/rust-lang/rust-clippy/issues/860)).
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => bar(), // <= oops
+ /// }
+ /// ```
+ ///
+ /// This should probably be
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar => bar(),
+ /// Quz => quz(),
+ /// Baz => baz(), // <= fixed
+ /// }
+ /// ```
+ ///
+ /// or if the original code was not a typo:
+ /// ```rust,ignore
+ /// match foo {
+ /// Bar | Baz => bar(), // <= shows the intent better
+ /// Quz => quz(),
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MATCH_SAME_ARMS,
+ pedantic,
+ "`match` with identical arm bodies"
+}
+
+#[derive(Default)]
+pub struct Matches {
+ msrv: Option<RustcVersion>,
+ infallible_destructuring_match_linted: bool,
+}
+
+impl Matches {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self {
+ msrv,
+ ..Matches::default()
+ }
+ }
+}
+
+impl_lint_pass!(Matches => [
+ SINGLE_MATCH,
+ MATCH_REF_PATS,
+ MATCH_BOOL,
+ SINGLE_MATCH_ELSE,
+ MATCH_OVERLAPPING_ARM,
+ MATCH_WILD_ERR_ARM,
+ MATCH_AS_REF,
+ WILDCARD_ENUM_MATCH_ARM,
+ MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ WILDCARD_IN_OR_PATTERNS,
+ MATCH_SINGLE_BINDING,
+ INFALLIBLE_DESTRUCTURING_MATCH,
+ REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ REDUNDANT_PATTERN_MATCHING,
+ MATCH_LIKE_MATCHES_MACRO,
+ MATCH_SAME_ARMS,
+]);
+
+impl<'tcx> LateLintPass<'tcx> for Matches {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ redundant_pattern_match::check(cx, expr);
+
+ if meets_msrv(self.msrv.as_ref(), &msrvs::MATCHES_MACRO) {
+ if !check_match_like_matches(cx, expr) {
+ lint_match_arms(cx, expr);
+ }
+ } else {
+ lint_match_arms(cx, expr);
+ }
+
+ if let ExprKind::Match(ex, arms, MatchSource::Normal) = expr.kind {
+ check_single_match(cx, ex, arms, expr);
+ check_match_bool(cx, ex, arms, expr);
+ check_overlapping_arms(cx, ex, arms);
+ check_wild_err_arm(cx, ex, arms);
+ check_wild_enum_match(cx, ex, arms);
+ check_match_as_ref(cx, ex, arms, expr);
+ check_wild_in_or_pats(cx, arms);
+
+ if self.infallible_destructuring_match_linted {
+ self.infallible_destructuring_match_linted = false;
+ } else {
+ check_match_single_binding(cx, ex, arms, expr);
+ }
+ }
+ if let ExprKind::Match(ex, arms, _) = expr.kind {
+ check_match_ref_pats(cx, ex, arms.iter().map(|el| el.pat), expr);
+ }
+ }
+
+ fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx Local<'_>) {
+ if_chain! {
+ if !local.span.from_expansion();
+ if let Some(expr) = local.init;
+ if let ExprKind::Match(target, arms, MatchSource::Normal) = expr.kind;
+ if arms.len() == 1 && arms[0].guard.is_none();
+ if let PatKind::TupleStruct(
+ QPath::Resolved(None, variant_name), args, _) = arms[0].pat.kind;
+ if args.len() == 1;
+ if let PatKind::Binding(_, arg, ..) = strip_pat_refs(&args[0]).kind;
+ let body = peel_blocks(arms[0].body);
+ if path_to_local_id(body, arg);
+
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ self.infallible_destructuring_match_linted = true;
+ span_lint_and_sugg(
+ cx,
+ INFALLIBLE_DESTRUCTURING_MATCH,
+ local.span,
+ "you seem to be trying to use `match` to destructure a single infallible pattern. \
+ Consider using `let`",
+ "try this",
+ format!(
+ "let {}({}) = {};",
+ snippet_with_applicability(cx, variant_name.span, "..", &mut applicability),
+ snippet_with_applicability(cx, local.pat.span, "..", &mut applicability),
+ snippet_with_applicability(cx, target.span, "..", &mut applicability),
+ ),
+ applicability,
+ );
+ }
+ }
+ }
+
+ fn check_pat(&mut self, cx: &LateContext<'tcx>, pat: &'tcx Pat<'_>) {
+ if_chain! {
+ if !pat.span.from_expansion();
+ if let PatKind::Struct(QPath::Resolved(_, path), fields, true) = pat.kind;
+ if let Some(def_id) = path.res.opt_def_id();
+ let ty = cx.tcx.type_of(def_id);
+ if let ty::Adt(def, _) = ty.kind();
+ if def.is_struct() || def.is_union();
+ if fields.len() == def.non_enum_variant().fields.len();
+
+ then {
+ span_lint_and_help(
+ cx,
+ REST_PAT_IN_FULLY_BOUND_STRUCTS,
+ pat.span,
+ "unnecessary use of `..` pattern in struct binding. All fields were already bound",
+ None,
+ "consider removing `..` from this binding",
+ );
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+#[rustfmt::skip]
+fn check_single_match(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ if arms.len() == 2 && arms[0].guard.is_none() && arms[1].guard.is_none() {
+ if expr.span.from_expansion() {
+ // Don't lint match expressions present in
+ // macro_rules! block
+ return;
+ }
+ if let PatKind::Or(..) = arms[0].pat.kind {
+ // don't lint for or patterns for now, this makes
+ // the lint noisy in unnecessary situations
+ return;
+ }
+ let els = arms[1].body;
+ let els = if is_unit_expr(peel_blocks(els)) {
+ None
+ } else if let ExprKind::Block(Block { stmts, expr: block_expr, .. }, _) = els.kind {
+ if stmts.len() == 1 && block_expr.is_none() || stmts.is_empty() && block_expr.is_some() {
+ // single statement/expr "else" block, don't lint
+ return;
+ }
+ // block with 2+ statements or 1 expr and 1+ statement
+ Some(els)
+ } else {
+ // not a block, don't lint
+ return;
+ };
+
+ let ty = cx.typeck_results().expr_ty(ex);
+ if *ty.kind() != ty::Bool || is_lint_allowed(cx, MATCH_BOOL, ex.hir_id) {
+ check_single_match_single_pattern(cx, ex, arms, expr, els);
+ check_single_match_opt_like(cx, ex, arms, expr, ty, els);
+ }
+ }
+}
+
+fn check_single_match_single_pattern(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ els: Option<&Expr<'_>>,
+) {
+ if is_wild(arms[1].pat) {
+ report_single_match_single_pattern(cx, ex, arms, expr, els);
+ }
+}
+
+fn report_single_match_single_pattern(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ els: Option<&Expr<'_>>,
+) {
+ let lint = if els.is_some() { SINGLE_MATCH_ELSE } else { SINGLE_MATCH };
+ let els_str = els.map_or(String::new(), |els| {
+ format!(" else {}", expr_block(cx, els, None, "..", Some(expr.span)))
+ });
+
+ let (pat, pat_ref_count) = peel_hir_pat_refs(arms[0].pat);
+ let (msg, sugg) = if_chain! {
+ if let PatKind::Path(_) | PatKind::Lit(_) = pat.kind;
+ let (ty, ty_ref_count) = peel_mid_ty_refs(cx.typeck_results().expr_ty(ex));
+ if let Some(spe_trait_id) = cx.tcx.lang_items().structural_peq_trait();
+ if let Some(pe_trait_id) = cx.tcx.lang_items().eq_trait();
+ if ty.is_integral() || ty.is_char() || ty.is_str()
+ || (implements_trait(cx, ty, spe_trait_id, &[])
+ && implements_trait(cx, ty, pe_trait_id, &[ty.into()]));
+ then {
+ // scrutinee derives PartialEq and the pattern is a constant.
+ let pat_ref_count = match pat.kind {
+ // string literals are already a reference.
+ PatKind::Lit(Expr { kind: ExprKind::Lit(lit), .. }) if lit.node.is_str() => pat_ref_count + 1,
+ _ => pat_ref_count,
+ };
+ // References are only implicitly added to the pattern, so no overflow here.
+ // e.g. will work: match &Some(_) { Some(_) => () }
+ // will not: match Some(_) { &Some(_) => () }
+ let ref_count_diff = ty_ref_count - pat_ref_count;
+
+ // Try to remove address of expressions first.
+ let (ex, removed) = peel_n_hir_expr_refs(ex, ref_count_diff);
+ let ref_count_diff = ref_count_diff - removed;
+
+ let msg = "you seem to be trying to use `match` for an equality check. Consider using `if`";
+ let sugg = format!(
+ "if {} == {}{} {}{}",
+ snippet(cx, ex.span, ".."),
+ // PartialEq for different reference counts may not exist.
+ "&".repeat(ref_count_diff),
+ snippet(cx, arms[0].pat.span, ".."),
+ expr_block(cx, arms[0].body, None, "..", Some(expr.span)),
+ els_str,
+ );
+ (msg, sugg)
+ } else {
+ let msg = "you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`";
+ let sugg = format!(
+ "if let {} = {} {}{}",
+ snippet(cx, arms[0].pat.span, ".."),
+ snippet(cx, ex.span, ".."),
+ expr_block(cx, arms[0].body, None, "..", Some(expr.span)),
+ els_str,
+ );
+ (msg, sugg)
+ }
+ };
+
+ span_lint_and_sugg(
+ cx,
+ lint,
+ expr.span,
+ msg,
+ "try this",
+ sugg,
+ Applicability::HasPlaceholders,
+ );
+}
+
+fn check_single_match_opt_like(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ arms: &[Arm<'_>],
+ expr: &Expr<'_>,
+ ty: Ty<'_>,
+ els: Option<&Expr<'_>>,
+) {
+ // list of candidate `Enum`s we know will never get any more members
+ let candidates = &[
+ (&paths::COW, "Borrowed"),
+ (&paths::COW, "Cow::Borrowed"),
+ (&paths::COW, "Cow::Owned"),
+ (&paths::COW, "Owned"),
+ (&paths::OPTION, "None"),
+ (&paths::RESULT, "Err"),
+ (&paths::RESULT, "Ok"),
+ ];
+
+ let path = match arms[1].pat.kind {
+ PatKind::TupleStruct(ref path, inner, _) => {
+ // Contains any non wildcard patterns (e.g., `Err(err)`)?
+ if !inner.iter().all(is_wild) {
+ return;
+ }
+ rustc_hir_pretty::to_string(rustc_hir_pretty::NO_ANN, |s| s.print_qpath(path, false))
+ },
+ PatKind::Binding(BindingAnnotation::Unannotated, .., ident, None) => ident.to_string(),
+ PatKind::Path(ref path) => {
+ rustc_hir_pretty::to_string(rustc_hir_pretty::NO_ANN, |s| s.print_qpath(path, false))
+ },
+ _ => return,
+ };
+
+ for &(ty_path, pat_path) in candidates {
+ if path == *pat_path && match_type(cx, ty, ty_path) {
+ report_single_match_single_pattern(cx, ex, arms, expr, els);
+ }
+ }
+}
+
+fn check_match_bool(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ // Type of expression is `bool`.
+ if *cx.typeck_results().expr_ty(ex).kind() == ty::Bool {
+ span_lint_and_then(
+ cx,
+ MATCH_BOOL,
+ expr.span,
+ "you seem to be trying to match on a boolean expression",
+ move |diag| {
+ if arms.len() == 2 {
+ // no guards
+ let exprs = if let PatKind::Lit(arm_bool) = arms[0].pat.kind {
+ if let ExprKind::Lit(ref lit) = arm_bool.kind {
+ match lit.node {
+ LitKind::Bool(true) => Some((&*arms[0].body, &*arms[1].body)),
+ LitKind::Bool(false) => Some((&*arms[1].body, &*arms[0].body)),
+ _ => None,
+ }
+ } else {
+ None
+ }
+ } else {
+ None
+ };
+
+ if let Some((true_expr, false_expr)) = exprs {
+ let sugg = match (is_unit_expr(true_expr), is_unit_expr(false_expr)) {
+ (false, false) => Some(format!(
+ "if {} {} else {}",
+ snippet(cx, ex.span, "b"),
+ expr_block(cx, true_expr, None, "..", Some(expr.span)),
+ expr_block(cx, false_expr, None, "..", Some(expr.span))
+ )),
+ (false, true) => Some(format!(
+ "if {} {}",
+ snippet(cx, ex.span, "b"),
+ expr_block(cx, true_expr, None, "..", Some(expr.span))
+ )),
+ (true, false) => {
+ let test = Sugg::hir(cx, ex, "..");
+ Some(format!(
+ "if {} {}",
+ !test,
+ expr_block(cx, false_expr, None, "..", Some(expr.span))
+ ))
+ },
+ (true, true) => None,
+ };
+
+ if let Some(sugg) = sugg {
+ diag.span_suggestion(
+ expr.span,
+ "consider using an `if`/`else` expression",
+ sugg,
+ Applicability::HasPlaceholders,
+ );
+ }
+ }
+ }
+ },
+ );
+ }
+}
+
+fn check_overlapping_arms<'tcx>(cx: &LateContext<'tcx>, ex: &'tcx Expr<'_>, arms: &'tcx [Arm<'_>]) {
+ if arms.len() >= 2 && cx.typeck_results().expr_ty(ex).is_integral() {
+ let ranges = all_ranges(cx, arms, cx.typeck_results().expr_ty(ex));
+ if !ranges.is_empty() {
+ if let Some((start, end)) = overlapping(&ranges) {
+ span_lint_and_note(
+ cx,
+ MATCH_OVERLAPPING_ARM,
+ start.span,
+ "some ranges overlap",
+ Some(end.span),
+ "overlaps with this",
+ );
+ }
+ }
+ }
+}
+
+fn check_wild_err_arm<'tcx>(cx: &LateContext<'tcx>, ex: &Expr<'tcx>, arms: &[Arm<'tcx>]) {
+ let ex_ty = cx.typeck_results().expr_ty(ex).peel_refs();
+ if is_type_diagnostic_item(cx, ex_ty, sym::Result) {
+ for arm in arms {
+ if let PatKind::TupleStruct(ref path, inner, _) = arm.pat.kind {
+ let path_str = rustc_hir_pretty::to_string(rustc_hir_pretty::NO_ANN, |s| s.print_qpath(path, false));
+ if path_str == "Err" {
+ let mut matching_wild = inner.iter().any(is_wild);
- ident_bind_name = ident.name.as_str().to_string();
++ let mut ident_bind_name = kw::Underscore;
+ if !matching_wild {
+ // Looking for unused bindings (i.e.: `_e`)
+ for pat in inner.iter() {
+ if let PatKind::Binding(_, id, ident, None) = pat.kind {
+ if ident.as_str().starts_with('_') && !is_local_used(cx, arm.body, id) {
- &format!("`Err({})` matches all errors", &ident_bind_name),
++ ident_bind_name = ident.name;
+ matching_wild = true;
+ }
+ }
+ }
+ }
+ if_chain! {
+ if matching_wild;
+ if let Some(macro_call) = root_macro_call(peel_blocks_with_stmt(arm.body).span);
+ if is_panic(cx, macro_call.def_id);
+ then {
+ // `Err(_)` or `Err(_e)` arm with `panic!` found
+ span_lint_and_note(cx,
+ MATCH_WILD_ERR_ARM,
+ arm.pat.span,
++ &format!("`Err({})` matches all errors", ident_bind_name),
+ None,
+ "match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable",
+ );
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+enum CommonPrefixSearcher<'a> {
+ None,
+ Path(&'a [PathSegment<'a>]),
+ Mixed,
+}
+impl<'a> CommonPrefixSearcher<'a> {
+ fn with_path(&mut self, path: &'a [PathSegment<'a>]) {
+ match path {
+ [path @ .., _] => self.with_prefix(path),
+ [] => (),
+ }
+ }
+
+ fn with_prefix(&mut self, path: &'a [PathSegment<'a>]) {
+ match self {
+ Self::None => *self = Self::Path(path),
+ Self::Path(self_path)
+ if path
+ .iter()
+ .map(|p| p.ident.name)
+ .eq(self_path.iter().map(|p| p.ident.name)) => {},
+ Self::Path(_) => *self = Self::Mixed,
+ Self::Mixed => (),
+ }
+ }
+}
+
+fn is_hidden(cx: &LateContext<'_>, variant_def: &VariantDef) -> bool {
+ let attrs = cx.tcx.get_attrs(variant_def.def_id);
+ clippy_utils::attrs::is_doc_hidden(attrs) || clippy_utils::attrs::is_unstable(attrs)
+}
+
+#[allow(clippy::too_many_lines)]
+fn check_wild_enum_match(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>]) {
+ let ty = cx.typeck_results().expr_ty(ex).peel_refs();
+ let adt_def = match ty.kind() {
+ ty::Adt(adt_def, _)
+ if adt_def.is_enum()
+ && !(is_type_diagnostic_item(cx, ty, sym::Option) || is_type_diagnostic_item(cx, ty, sym::Result)) =>
+ {
+ adt_def
+ },
+ _ => return,
+ };
+
+ // First pass - check for violation, but don't do much book-keeping because this is hopefully
+ // the uncommon case, and the book-keeping is slightly expensive.
+ let mut wildcard_span = None;
+ let mut wildcard_ident = None;
+ let mut has_non_wild = false;
+ for arm in arms {
+ match peel_hir_pat_refs(arm.pat).0.kind {
+ PatKind::Wild => wildcard_span = Some(arm.pat.span),
+ PatKind::Binding(_, _, ident, None) => {
+ wildcard_span = Some(arm.pat.span);
+ wildcard_ident = Some(ident);
+ },
+ _ => has_non_wild = true,
+ }
+ }
+ let wildcard_span = match wildcard_span {
+ Some(x) if has_non_wild => x,
+ _ => return,
+ };
+
+ // Accumulate the variants which should be put in place of the wildcard because they're not
+ // already covered.
+ let has_hidden = adt_def.variants.iter().any(|x| is_hidden(cx, x));
+ let mut missing_variants: Vec<_> = adt_def.variants.iter().filter(|x| !is_hidden(cx, x)).collect();
+
+ let mut path_prefix = CommonPrefixSearcher::None;
+ for arm in arms {
+ // Guards mean that this case probably isn't exhaustively covered. Technically
+ // this is incorrect, as we should really check whether each variant is exhaustively
+ // covered by the set of guards that cover it, but that's really hard to do.
+ recurse_or_patterns(arm.pat, |pat| {
+ let path = match &peel_hir_pat_refs(pat).0.kind {
+ PatKind::Path(path) => {
+ #[allow(clippy::match_same_arms)]
+ let id = match cx.qpath_res(path, pat.hir_id) {
+ Res::Def(
+ DefKind::Const | DefKind::ConstParam | DefKind::AnonConst | DefKind::InlineConst,
+ _,
+ ) => return,
+ Res::Def(_, id) => id,
+ _ => return,
+ };
+ if arm.guard.is_none() {
+ missing_variants.retain(|e| e.ctor_def_id != Some(id));
+ }
+ path
+ },
+ PatKind::TupleStruct(path, patterns, ..) => {
+ if let Some(id) = cx.qpath_res(path, pat.hir_id).opt_def_id() {
+ if arm.guard.is_none() && patterns.iter().all(|p| !is_refutable(cx, p)) {
+ missing_variants.retain(|e| e.ctor_def_id != Some(id));
+ }
+ }
+ path
+ },
+ PatKind::Struct(path, patterns, ..) => {
+ if let Some(id) = cx.qpath_res(path, pat.hir_id).opt_def_id() {
+ if arm.guard.is_none() && patterns.iter().all(|p| !is_refutable(cx, p.pat)) {
+ missing_variants.retain(|e| e.def_id != id);
+ }
+ }
+ path
+ },
+ _ => return,
+ };
+ match path {
+ QPath::Resolved(_, path) => path_prefix.with_path(path.segments),
+ QPath::TypeRelative(
+ hir::Ty {
+ kind: TyKind::Path(QPath::Resolved(_, path)),
+ ..
+ },
+ _,
+ ) => path_prefix.with_prefix(path.segments),
+ _ => (),
+ }
+ });
+ }
+
+ let format_suggestion = |variant: &VariantDef| {
+ format!(
+ "{}{}{}{}",
+ if let Some(ident) = wildcard_ident {
+ format!("{} @ ", ident.name)
+ } else {
+ String::new()
+ },
+ if let CommonPrefixSearcher::Path(path_prefix) = path_prefix {
+ let mut s = String::new();
+ for seg in path_prefix {
+ s.push_str(seg.ident.as_str());
+ s.push_str("::");
+ }
+ s
+ } else {
+ let mut s = cx.tcx.def_path_str(adt_def.did);
+ s.push_str("::");
+ s
+ },
+ variant.name,
+ match variant.ctor_kind {
+ CtorKind::Fn if variant.fields.len() == 1 => "(_)",
+ CtorKind::Fn => "(..)",
+ CtorKind::Const => "",
+ CtorKind::Fictive => "{ .. }",
+ }
+ )
+ };
+
+ match missing_variants.as_slice() {
+ [] => (),
+ [x] if !adt_def.is_variant_list_non_exhaustive() && !has_hidden => span_lint_and_sugg(
+ cx,
+ MATCH_WILDCARD_FOR_SINGLE_VARIANTS,
+ wildcard_span,
+ "wildcard matches only a single variant and will also match any future added variants",
+ "try this",
+ format_suggestion(x),
+ Applicability::MaybeIncorrect,
+ ),
+ variants => {
+ let mut suggestions: Vec<_> = variants.iter().copied().map(format_suggestion).collect();
+ let message = if adt_def.is_variant_list_non_exhaustive() || has_hidden {
+ suggestions.push("_".into());
+ "wildcard matches known variants and will also match future added variants"
+ } else {
+ "wildcard match will also match any future added variants"
+ };
+
+ span_lint_and_sugg(
+ cx,
+ WILDCARD_ENUM_MATCH_ARM,
+ wildcard_span,
+ message,
+ "try this",
+ suggestions.join(" | "),
+ Applicability::MaybeIncorrect,
+ );
+ },
+ };
+}
+
+fn check_match_ref_pats<'a, 'b, I>(cx: &LateContext<'_>, ex: &Expr<'_>, pats: I, expr: &Expr<'_>)
+where
+ 'b: 'a,
+ I: Clone + Iterator<Item = &'a Pat<'b>>,
+{
+ if !has_multiple_ref_pats(pats.clone()) {
+ return;
+ }
+
+ let (first_sugg, msg, title);
+ let span = ex.span.source_callsite();
+ if let ExprKind::AddrOf(BorrowKind::Ref, Mutability::Not, inner) = ex.kind {
+ first_sugg = once((span, Sugg::hir_with_macro_callsite(cx, inner, "..").to_string()));
+ msg = "try";
+ title = "you don't need to add `&` to both the expression and the patterns";
+ } else {
+ first_sugg = once((span, Sugg::hir_with_macro_callsite(cx, ex, "..").deref().to_string()));
+ msg = "instead of prefixing all patterns with `&`, you can dereference the expression";
+ title = "you don't need to add `&` to all patterns";
+ }
+
+ let remaining_suggs = pats.filter_map(|pat| {
+ if let PatKind::Ref(refp, _) = pat.kind {
+ Some((pat.span, snippet(cx, refp.span, "..").to_string()))
+ } else {
+ None
+ }
+ });
+
+ span_lint_and_then(cx, MATCH_REF_PATS, expr.span, title, |diag| {
+ if !expr.span.from_expansion() {
+ multispan_sugg(diag, msg, first_sugg.chain(remaining_suggs));
+ }
+ });
+}
+
+fn check_match_as_ref(cx: &LateContext<'_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ if arms.len() == 2 && arms[0].guard.is_none() && arms[1].guard.is_none() {
+ let arm_ref: Option<BindingAnnotation> = if is_none_arm(cx, &arms[0]) {
+ is_ref_some_arm(cx, &arms[1])
+ } else if is_none_arm(cx, &arms[1]) {
+ is_ref_some_arm(cx, &arms[0])
+ } else {
+ None
+ };
+ if let Some(rb) = arm_ref {
+ let suggestion = if rb == BindingAnnotation::Ref {
+ "as_ref"
+ } else {
+ "as_mut"
+ };
+
+ let output_ty = cx.typeck_results().expr_ty(expr);
+ let input_ty = cx.typeck_results().expr_ty(ex);
+
+ let cast = if_chain! {
+ if let ty::Adt(_, substs) = input_ty.kind();
+ let input_ty = substs.type_at(0);
+ if let ty::Adt(_, substs) = output_ty.kind();
+ let output_ty = substs.type_at(0);
+ if let ty::Ref(_, output_ty, _) = *output_ty.kind();
+ if input_ty != output_ty;
+ then {
+ ".map(|x| x as _)"
+ } else {
+ ""
+ }
+ };
+
+ let mut applicability = Applicability::MachineApplicable;
+ span_lint_and_sugg(
+ cx,
+ MATCH_AS_REF,
+ expr.span,
+ &format!("use `{}()` instead", suggestion),
+ "try this",
+ format!(
+ "{}.{}(){}",
+ snippet_with_applicability(cx, ex.span, "_", &mut applicability),
+ suggestion,
+ cast,
+ ),
+ applicability,
+ );
+ }
+ }
+}
+
+fn check_wild_in_or_pats(cx: &LateContext<'_>, arms: &[Arm<'_>]) {
+ for arm in arms {
+ if let PatKind::Or(fields) = arm.pat.kind {
+ // look for multiple fields in this arm that contains at least one Wild pattern
+ if fields.len() > 1 && fields.iter().any(is_wild) {
+ span_lint_and_help(
+ cx,
+ WILDCARD_IN_OR_PATTERNS,
+ arm.pat.span,
+ "wildcard pattern covers any other pattern as it will match anyway",
+ None,
+ "consider handling `_` separately",
+ );
+ }
+ }
+ }
+}
+
+/// Lint a `match` or `if let .. { .. } else { .. }` expr that could be replaced by `matches!`
+fn check_match_like_matches<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> bool {
+ if let Some(higher::IfLet {
+ let_pat,
+ let_expr,
+ if_then,
+ if_else: Some(if_else),
+ }) = higher::IfLet::hir(cx, expr)
+ {
+ return find_matches_sugg(
+ cx,
+ let_expr,
+ IntoIterator::into_iter([(&[][..], Some(let_pat), if_then, None), (&[][..], None, if_else, None)]),
+ expr,
+ true,
+ );
+ }
+
+ if let ExprKind::Match(scrut, arms, MatchSource::Normal) = expr.kind {
+ return find_matches_sugg(
+ cx,
+ scrut,
+ arms.iter().map(|arm| {
+ (
+ cx.tcx.hir().attrs(arm.hir_id),
+ Some(arm.pat),
+ arm.body,
+ arm.guard.as_ref(),
+ )
+ }),
+ expr,
+ false,
+ );
+ }
+
+ false
+}
+
+/// Lint a `match` or `if let` for replacement by `matches!`
+fn find_matches_sugg<'a, 'b, I>(
+ cx: &LateContext<'_>,
+ ex: &Expr<'_>,
+ mut iter: I,
+ expr: &Expr<'_>,
+ is_if_let: bool,
+) -> bool
+where
+ 'b: 'a,
+ I: Clone
+ + DoubleEndedIterator
+ + ExactSizeIterator
+ + Iterator<
+ Item = (
+ &'a [Attribute],
+ Option<&'a Pat<'b>>,
+ &'a Expr<'b>,
+ Option<&'a Guard<'b>>,
+ ),
+ >,
+{
+ if_chain! {
+ if iter.len() >= 2;
+ if cx.typeck_results().expr_ty(expr).is_bool();
+ if let Some((_, last_pat_opt, last_expr, _)) = iter.next_back();
+ let iter_without_last = iter.clone();
+ if let Some((first_attrs, _, first_expr, first_guard)) = iter.next();
+ if let Some(b0) = find_bool_lit(&first_expr.kind, is_if_let);
+ if let Some(b1) = find_bool_lit(&last_expr.kind, is_if_let);
+ if b0 != b1;
+ if first_guard.is_none() || iter.len() == 0;
+ if first_attrs.is_empty();
+ if iter
+ .all(|arm| {
+ find_bool_lit(&arm.2.kind, is_if_let).map_or(false, |b| b == b0) && arm.3.is_none() && arm.0.is_empty()
+ });
+ then {
+ if let Some(last_pat) = last_pat_opt {
+ if !is_wild(last_pat) {
+ return false;
+ }
+ }
+
+ // The suggestion may be incorrect, because some arms can have `cfg` attributes
+ // evaluated into `false` and so such arms will be stripped before.
+ let mut applicability = Applicability::MaybeIncorrect;
+ let pat = {
+ use itertools::Itertools as _;
+ iter_without_last
+ .filter_map(|arm| {
+ let pat_span = arm.1?.span;
+ Some(snippet_with_applicability(cx, pat_span, "..", &mut applicability))
+ })
+ .join(" | ")
+ };
+ let pat_and_guard = if let Some(Guard::If(g)) = first_guard {
+ format!("{} if {}", pat, snippet_with_applicability(cx, g.span, "..", &mut applicability))
+ } else {
+ pat
+ };
+
+ // strip potential borrows (#6503), but only if the type is a reference
+ let mut ex_new = ex;
+ if let ExprKind::AddrOf(BorrowKind::Ref, .., ex_inner) = ex.kind {
+ if let ty::Ref(..) = cx.typeck_results().expr_ty(ex_inner).kind() {
+ ex_new = ex_inner;
+ }
+ };
+ span_lint_and_sugg(
+ cx,
+ MATCH_LIKE_MATCHES_MACRO,
+ expr.span,
+ &format!("{} expression looks like `matches!` macro", if is_if_let { "if let .. else" } else { "match" }),
+ "try this",
+ format!(
+ "{}matches!({}, {})",
+ if b0 { "" } else { "!" },
+ snippet_with_applicability(cx, ex_new.span, "..", &mut applicability),
+ pat_and_guard,
+ ),
+ applicability,
+ );
+ true
+ } else {
+ false
+ }
+ }
+}
+
+/// Extract a `bool` or `{ bool }`
+fn find_bool_lit(ex: &ExprKind<'_>, is_if_let: bool) -> Option<bool> {
+ match ex {
+ ExprKind::Lit(Spanned {
+ node: LitKind::Bool(b), ..
+ }) => Some(*b),
+ ExprKind::Block(
+ rustc_hir::Block {
+ stmts: &[],
+ expr: Some(exp),
+ ..
+ },
+ _,
+ ) if is_if_let => {
+ if let ExprKind::Lit(Spanned {
+ node: LitKind::Bool(b), ..
+ }) = exp.kind
+ {
+ Some(b)
+ } else {
+ None
+ }
+ },
+ _ => None,
+ }
+}
+
+#[allow(clippy::too_many_lines)]
+fn check_match_single_binding<'a>(cx: &LateContext<'a>, ex: &Expr<'a>, arms: &[Arm<'_>], expr: &Expr<'_>) {
+ if expr.span.from_expansion() || arms.len() != 1 || is_refutable(cx, arms[0].pat) {
+ return;
+ }
+
+ // HACK:
+ // This is a hack to deal with arms that are excluded by macros like `#[cfg]`. It is only used here
+ // to prevent false positives as there is currently no better way to detect if code was excluded by
+ // a macro. See PR #6435
+ if_chain! {
+ if let Some(match_snippet) = snippet_opt(cx, expr.span);
+ if let Some(arm_snippet) = snippet_opt(cx, arms[0].span);
+ if let Some(ex_snippet) = snippet_opt(cx, ex.span);
+ let rest_snippet = match_snippet.replace(&arm_snippet, "").replace(&ex_snippet, "");
+ if rest_snippet.contains("=>");
+ then {
+ // The code it self contains another thick arrow "=>"
+ // -> Either another arm or a comment
+ return;
+ }
+ }
+
+ let matched_vars = ex.span;
+ let bind_names = arms[0].pat.span;
+ let match_body = peel_blocks(arms[0].body);
+ let mut snippet_body = if match_body.span.from_expansion() {
+ Sugg::hir_with_macro_callsite(cx, match_body, "..").to_string()
+ } else {
+ snippet_block(cx, match_body.span, "..", Some(expr.span)).to_string()
+ };
+
+ // Do we need to add ';' to suggestion ?
+ match match_body.kind {
+ ExprKind::Block(block, _) => {
+ // macro + expr_ty(body) == ()
+ if block.span.from_expansion() && cx.typeck_results().expr_ty(match_body).is_unit() {
+ snippet_body.push(';');
+ }
+ },
+ _ => {
+ // expr_ty(body) == ()
+ if cx.typeck_results().expr_ty(match_body).is_unit() {
+ snippet_body.push(';');
+ }
+ },
+ }
+
+ let mut applicability = Applicability::MaybeIncorrect;
+ match arms[0].pat.kind {
+ PatKind::Binding(..) | PatKind::Tuple(_, _) | PatKind::Struct(..) => {
+ // If this match is in a local (`let`) stmt
+ let (target_span, sugg) = if let Some(parent_let_node) = opt_parent_let(cx, ex) {
+ (
+ parent_let_node.span,
+ format!(
+ "let {} = {};\n{}let {} = {};",
+ snippet_with_applicability(cx, bind_names, "..", &mut applicability),
+ snippet_with_applicability(cx, matched_vars, "..", &mut applicability),
+ " ".repeat(indent_of(cx, expr.span).unwrap_or(0)),
+ snippet_with_applicability(cx, parent_let_node.pat.span, "..", &mut applicability),
+ snippet_body
+ ),
+ )
+ } else {
+ // If we are in closure, we need curly braces around suggestion
+ let mut indent = " ".repeat(indent_of(cx, ex.span).unwrap_or(0));
+ let (mut cbrace_start, mut cbrace_end) = ("".to_string(), "".to_string());
+ if let Some(parent_expr) = get_parent_expr(cx, expr) {
+ if let ExprKind::Closure(..) = parent_expr.kind {
+ cbrace_end = format!("\n{}}}", indent);
+ // Fix body indent due to the closure
+ indent = " ".repeat(indent_of(cx, bind_names).unwrap_or(0));
+ cbrace_start = format!("{{\n{}", indent);
+ }
+ }
+ // If the parent is already an arm, and the body is another match statement,
+ // we need curly braces around suggestion
+ let parent_node_id = cx.tcx.hir().get_parent_node(expr.hir_id);
+ if let Node::Arm(arm) = &cx.tcx.hir().get(parent_node_id) {
+ if let ExprKind::Match(..) = arm.body.kind {
+ cbrace_end = format!("\n{}}}", indent);
+ // Fix body indent due to the match
+ indent = " ".repeat(indent_of(cx, bind_names).unwrap_or(0));
+ cbrace_start = format!("{{\n{}", indent);
+ }
+ }
+ (
+ expr.span,
+ format!(
+ "{}let {} = {};\n{}{}{}",
+ cbrace_start,
+ snippet_with_applicability(cx, bind_names, "..", &mut applicability),
+ snippet_with_applicability(cx, matched_vars, "..", &mut applicability),
+ indent,
+ snippet_body,
+ cbrace_end
+ ),
+ )
+ };
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ target_span,
+ "this match could be written as a `let` statement",
+ "consider using `let` statement",
+ sugg,
+ applicability,
+ );
+ },
+ PatKind::Wild => {
+ if ex.can_have_side_effects() {
+ let indent = " ".repeat(indent_of(cx, expr.span).unwrap_or(0));
+ let sugg = format!(
+ "{};\n{}{}",
+ snippet_with_applicability(cx, ex.span, "..", &mut applicability),
+ indent,
+ snippet_body
+ );
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ expr.span,
+ "this match could be replaced by its scrutinee and body",
+ "consider using the scrutinee and body instead",
+ sugg,
+ applicability,
+ );
+ } else {
+ span_lint_and_sugg(
+ cx,
+ MATCH_SINGLE_BINDING,
+ expr.span,
+ "this match could be replaced by its body itself",
+ "consider using the match body instead",
+ snippet_body,
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ _ => (),
+ }
+}
+
+/// Returns true if the `ex` match expression is in a local (`let`) statement
+fn opt_parent_let<'a>(cx: &LateContext<'a>, ex: &Expr<'a>) -> Option<&'a Local<'a>> {
+ let map = &cx.tcx.hir();
+ if_chain! {
+ if let Some(Node::Expr(parent_arm_expr)) = map.find(map.get_parent_node(ex.hir_id));
+ if let Some(Node::Local(parent_let_expr)) = map.find(map.get_parent_node(parent_arm_expr.hir_id));
+ then {
+ return Some(parent_let_expr);
+ }
+ }
+ None
+}
+
+/// Gets the ranges for each range pattern arm. Applies `ty` bounds for open ranges.
+fn all_ranges<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>], ty: Ty<'tcx>) -> Vec<SpannedRange<FullInt>> {
+ arms.iter()
+ .filter_map(|arm| {
+ if let Arm { pat, guard: None, .. } = *arm {
+ if let PatKind::Range(ref lhs, ref rhs, range_end) = pat.kind {
+ let lhs_const = match lhs {
+ Some(lhs) => constant(cx, cx.typeck_results(), lhs)?.0,
+ None => miri_to_const(ty.numeric_min_val(cx.tcx)?)?,
+ };
+ let rhs_const = match rhs {
+ Some(rhs) => constant(cx, cx.typeck_results(), rhs)?.0,
+ None => miri_to_const(ty.numeric_max_val(cx.tcx)?)?,
+ };
+
+ let lhs_val = lhs_const.int_value(cx, ty)?;
+ let rhs_val = rhs_const.int_value(cx, ty)?;
+
+ let rhs_bound = match range_end {
+ RangeEnd::Included => EndBound::Included(rhs_val),
+ RangeEnd::Excluded => EndBound::Excluded(rhs_val),
+ };
+ return Some(SpannedRange {
+ span: pat.span,
+ node: (lhs_val, rhs_bound),
+ });
+ }
+
+ if let PatKind::Lit(value) = pat.kind {
+ let value = constant_full_int(cx, cx.typeck_results(), value)?;
+ return Some(SpannedRange {
+ span: pat.span,
+ node: (value, EndBound::Included(value)),
+ });
+ }
+ }
+ None
+ })
+ .collect()
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum EndBound<T> {
+ Included(T),
+ Excluded(T),
+}
+
+#[derive(Debug, Eq, PartialEq)]
+struct SpannedRange<T> {
+ pub span: Span,
+ pub node: (T, EndBound<T>),
+}
+
+// Checks if arm has the form `None => None`
+fn is_none_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ matches!(arm.pat.kind, PatKind::Path(ref qpath) if is_lang_ctor(cx, qpath, OptionNone))
+}
+
+// Checks if arm has the form `Some(ref v) => Some(v)` (checks for `ref` and `ref mut`)
+fn is_ref_some_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> Option<BindingAnnotation> {
+ if_chain! {
+ if let PatKind::TupleStruct(ref qpath, [first_pat, ..], _) = arm.pat.kind;
+ if is_lang_ctor(cx, qpath, OptionSome);
+ if let PatKind::Binding(rb, .., ident, _) = first_pat.kind;
+ if rb == BindingAnnotation::Ref || rb == BindingAnnotation::RefMut;
+ if let ExprKind::Call(e, args) = peel_blocks(arm.body).kind;
+ if let ExprKind::Path(ref some_path) = e.kind;
+ if is_lang_ctor(cx, some_path, OptionSome) && args.len() == 1;
+ if let ExprKind::Path(QPath::Resolved(_, path2)) = args[0].kind;
+ if path2.segments.len() == 1 && ident.name == path2.segments[0].ident.name;
+ then {
+ return Some(rb)
+ }
+ }
+ None
+}
+
+fn has_multiple_ref_pats<'a, 'b, I>(pats: I) -> bool
+where
+ 'b: 'a,
+ I: Iterator<Item = &'a Pat<'b>>,
+{
+ let mut ref_count = 0;
+ for opt in pats.map(|pat| match pat.kind {
+ PatKind::Ref(..) => Some(true), // &-patterns
+ PatKind::Wild => Some(false), // an "anything" wildcard is also fine
+ _ => None, // any other pattern is not fine
+ }) {
+ if let Some(inner) = opt {
+ if inner {
+ ref_count += 1;
+ }
+ } else {
+ return false;
+ }
+ }
+ ref_count > 1
+}
+
+fn overlapping<T>(ranges: &[SpannedRange<T>]) -> Option<(&SpannedRange<T>, &SpannedRange<T>)>
+where
+ T: Copy + Ord,
+{
+ #[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+ enum BoundKind {
+ EndExcluded,
+ Start,
+ EndIncluded,
+ }
+
+ #[derive(Copy, Clone, Debug, Eq, PartialEq)]
+ struct RangeBound<'a, T>(T, BoundKind, &'a SpannedRange<T>);
+
+ impl<'a, T: Copy + Ord> PartialOrd for RangeBound<'a, T> {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+ }
+
+ impl<'a, T: Copy + Ord> Ord for RangeBound<'a, T> {
+ fn cmp(&self, RangeBound(other_value, other_kind, _): &Self) -> Ordering {
+ let RangeBound(self_value, self_kind, _) = *self;
+ (self_value, self_kind).cmp(&(*other_value, *other_kind))
+ }
+ }
+
+ let mut values = Vec::with_capacity(2 * ranges.len());
+
+ for r @ SpannedRange { node: (start, end), .. } in ranges {
+ values.push(RangeBound(*start, BoundKind::Start, r));
+ values.push(match end {
+ EndBound::Excluded(val) => RangeBound(*val, BoundKind::EndExcluded, r),
+ EndBound::Included(val) => RangeBound(*val, BoundKind::EndIncluded, r),
+ });
+ }
+
+ values.sort();
+
+ let mut started = vec![];
+
+ for RangeBound(_, kind, range) in values {
+ match kind {
+ BoundKind::Start => started.push(range),
+ BoundKind::EndExcluded | BoundKind::EndIncluded => {
+ let mut overlap = None;
+
+ while let Some(last_started) = started.pop() {
+ if last_started == range {
+ break;
+ }
+ overlap = Some(last_started);
+ }
+
+ if let Some(first_overlapping) = overlap {
+ return Some((range, first_overlapping));
+ }
+ },
+ }
+ }
+
+ None
+}
+
+mod redundant_pattern_match {
+ use super::REDUNDANT_PATTERN_MATCHING;
+ use clippy_utils::diagnostics::span_lint_and_then;
+ use clippy_utils::higher;
+ use clippy_utils::source::snippet;
+ use clippy_utils::sugg::Sugg;
+ use clippy_utils::ty::{implements_trait, is_type_diagnostic_item, is_type_lang_item, match_type};
+ use clippy_utils::{is_lang_ctor, is_qpath_def_path, is_trait_method, paths};
+ use if_chain::if_chain;
+ use rustc_ast::ast::LitKind;
+ use rustc_data_structures::fx::FxHashSet;
+ use rustc_errors::Applicability;
+ use rustc_hir::LangItem::{OptionNone, OptionSome, PollPending, PollReady, ResultErr, ResultOk};
+ use rustc_hir::{
+ intravisit::{walk_expr, Visitor},
+ Arm, Block, Expr, ExprKind, LangItem, MatchSource, Node, Pat, PatKind, QPath, UnOp,
+ };
+ use rustc_lint::LateContext;
+ use rustc_middle::ty::{self, subst::GenericArgKind, Ty};
+ use rustc_span::sym;
+
+ pub fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let Some(higher::IfLet {
+ if_else,
+ let_pat,
+ let_expr,
+ ..
+ }) = higher::IfLet::hir(cx, expr)
+ {
+ find_sugg_for_if_let(cx, expr, let_pat, let_expr, "if", if_else.is_some());
+ }
+ if let ExprKind::Match(op, arms, MatchSource::Normal) = &expr.kind {
+ find_sugg_for_match(cx, expr, op, arms);
+ }
+ if let Some(higher::WhileLet { let_pat, let_expr, .. }) = higher::WhileLet::hir(expr) {
+ find_sugg_for_if_let(cx, expr, let_pat, let_expr, "while", false);
+ }
+ }
+
+ /// Checks if the drop order for a type matters. Some std types implement drop solely to
+ /// deallocate memory. For these types, and composites containing them, changing the drop order
+ /// won't result in any observable side effects.
+ fn type_needs_ordered_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ type_needs_ordered_drop_inner(cx, ty, &mut FxHashSet::default())
+ }
+
+ fn type_needs_ordered_drop_inner<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ seen: &mut FxHashSet<Ty<'tcx>>,
+ ) -> bool {
+ if !seen.insert(ty) {
+ return false;
+ }
+ if !ty.needs_drop(cx.tcx, cx.param_env) {
+ false
+ } else if !cx
+ .tcx
+ .lang_items()
+ .drop_trait()
+ .map_or(false, |id| implements_trait(cx, ty, id, &[]))
+ {
+ // This type doesn't implement drop, so no side effects here.
+ // Check if any component type has any.
+ match ty.kind() {
+ ty::Tuple(_) => ty.tuple_fields().any(|ty| type_needs_ordered_drop_inner(cx, ty, seen)),
+ ty::Array(ty, _) => type_needs_ordered_drop_inner(cx, ty, seen),
+ ty::Adt(adt, subs) => adt
+ .all_fields()
+ .map(|f| f.ty(cx.tcx, subs))
+ .any(|ty| type_needs_ordered_drop_inner(cx, ty, seen)),
+ _ => true,
+ }
+ }
+ // Check for std types which implement drop, but only for memory allocation.
+ else if is_type_diagnostic_item(cx, ty, sym::Vec)
+ || is_type_lang_item(cx, ty, LangItem::OwnedBox)
+ || is_type_diagnostic_item(cx, ty, sym::Rc)
+ || is_type_diagnostic_item(cx, ty, sym::Arc)
+ || is_type_diagnostic_item(cx, ty, sym::cstring_type)
+ || is_type_diagnostic_item(cx, ty, sym::BTreeMap)
+ || is_type_diagnostic_item(cx, ty, sym::LinkedList)
+ || match_type(cx, ty, &paths::WEAK_RC)
+ || match_type(cx, ty, &paths::WEAK_ARC)
+ {
+ // Check all of the generic arguments.
+ if let ty::Adt(_, subs) = ty.kind() {
+ subs.types().any(|ty| type_needs_ordered_drop_inner(cx, ty, seen))
+ } else {
+ true
+ }
+ } else {
+ true
+ }
+ }
+
+ // Extract the generic arguments out of a type
+ fn try_get_generic_ty(ty: Ty<'_>, index: usize) -> Option<Ty<'_>> {
+ if_chain! {
+ if let ty::Adt(_, subs) = ty.kind();
+ if let Some(sub) = subs.get(index);
+ if let GenericArgKind::Type(sub_ty) = sub.unpack();
+ then {
+ Some(sub_ty)
+ } else {
+ None
+ }
+ }
+ }
+
+ // Checks if there are any temporaries created in the given expression for which drop order
+ // matters.
+ fn temporaries_need_ordered_drop<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
+ struct V<'a, 'tcx> {
+ cx: &'a LateContext<'tcx>,
+ res: bool,
+ }
+ impl<'a, 'tcx> Visitor<'tcx> for V<'a, 'tcx> {
+ fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) {
+ match expr.kind {
+ // Taking the reference of a value leaves a temporary
+ // e.g. In `&String::new()` the string is a temporary value.
+ // Remaining fields are temporary values
+ // e.g. In `(String::new(), 0).1` the string is a temporary value.
+ ExprKind::AddrOf(_, _, expr) | ExprKind::Field(expr, _) => {
+ if !matches!(expr.kind, ExprKind::Path(_)) {
+ if type_needs_ordered_drop(self.cx, self.cx.typeck_results().expr_ty(expr)) {
+ self.res = true;
+ } else {
+ self.visit_expr(expr);
+ }
+ }
+ },
+ // the base type is alway taken by reference.
+ // e.g. In `(vec![0])[0]` the vector is a temporary value.
+ ExprKind::Index(base, index) => {
+ if !matches!(base.kind, ExprKind::Path(_)) {
+ if type_needs_ordered_drop(self.cx, self.cx.typeck_results().expr_ty(base)) {
+ self.res = true;
+ } else {
+ self.visit_expr(base);
+ }
+ }
+ self.visit_expr(index);
+ },
+ // Method calls can take self by reference.
+ // e.g. In `String::new().len()` the string is a temporary value.
+ ExprKind::MethodCall(_, [self_arg, args @ ..], _) => {
+ if !matches!(self_arg.kind, ExprKind::Path(_)) {
+ let self_by_ref = self
+ .cx
+ .typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .map_or(false, |id| self.cx.tcx.fn_sig(id).skip_binder().inputs()[0].is_ref());
+ if self_by_ref
+ && type_needs_ordered_drop(self.cx, self.cx.typeck_results().expr_ty(self_arg))
+ {
+ self.res = true;
+ } else {
+ self.visit_expr(self_arg);
+ }
+ }
+ args.iter().for_each(|arg| self.visit_expr(arg));
+ },
+ // Either explicitly drops values, or changes control flow.
+ ExprKind::DropTemps(_)
+ | ExprKind::Ret(_)
+ | ExprKind::Break(..)
+ | ExprKind::Yield(..)
+ | ExprKind::Block(Block { expr: None, .. }, _)
+ | ExprKind::Loop(..) => (),
+
+ // Only consider the final expression.
+ ExprKind::Block(Block { expr: Some(expr), .. }, _) => self.visit_expr(expr),
+
+ _ => walk_expr(self, expr),
+ }
+ }
+ }
+
+ let mut v = V { cx, res: false };
+ v.visit_expr(expr);
+ v.res
+ }
+
+ fn find_sugg_for_if_let<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ let_pat: &Pat<'_>,
+ let_expr: &'tcx Expr<'_>,
+ keyword: &'static str,
+ has_else: bool,
+ ) {
+ // also look inside refs
+ let mut kind = &let_pat.kind;
+ // if we have &None for example, peel it so we can detect "if let None = x"
+ if let PatKind::Ref(inner, _mutability) = kind {
+ kind = &inner.kind;
+ }
+ let op_ty = cx.typeck_results().expr_ty(let_expr);
+ // Determine which function should be used, and the type contained by the corresponding
+ // variant.
+ let (good_method, inner_ty) = match kind {
+ PatKind::TupleStruct(ref path, [sub_pat], _) => {
+ if let PatKind::Wild = sub_pat.kind {
+ if is_lang_ctor(cx, path, ResultOk) {
+ ("is_ok()", try_get_generic_ty(op_ty, 0).unwrap_or(op_ty))
+ } else if is_lang_ctor(cx, path, ResultErr) {
+ ("is_err()", try_get_generic_ty(op_ty, 1).unwrap_or(op_ty))
+ } else if is_lang_ctor(cx, path, OptionSome) {
+ ("is_some()", op_ty)
+ } else if is_lang_ctor(cx, path, PollReady) {
+ ("is_ready()", op_ty)
+ } else if is_qpath_def_path(cx, path, sub_pat.hir_id, &paths::IPADDR_V4) {
+ ("is_ipv4()", op_ty)
+ } else if is_qpath_def_path(cx, path, sub_pat.hir_id, &paths::IPADDR_V6) {
+ ("is_ipv6()", op_ty)
+ } else {
+ return;
+ }
+ } else {
+ return;
+ }
+ },
+ PatKind::Path(ref path) => {
+ let method = if is_lang_ctor(cx, path, OptionNone) {
+ "is_none()"
+ } else if is_lang_ctor(cx, path, PollPending) {
+ "is_pending()"
+ } else {
+ return;
+ };
+ // `None` and `Pending` don't have an inner type.
+ (method, cx.tcx.types.unit)
+ },
+ _ => return,
+ };
+
+ // If this is the last expression in a block or there is an else clause then the whole
+ // type needs to be considered, not just the inner type of the branch being matched on.
+ // Note the last expression in a block is dropped after all local bindings.
+ let check_ty = if has_else
+ || (keyword == "if" && matches!(cx.tcx.hir().parent_iter(expr.hir_id).next(), Some((_, Node::Block(..)))))
+ {
+ op_ty
+ } else {
+ inner_ty
+ };
+
+ // All temporaries created in the scrutinee expression are dropped at the same time as the
+ // scrutinee would be, so they have to be considered as well.
+ // e.g. in `if let Some(x) = foo.lock().unwrap().baz.as_ref() { .. }` the lock will be held
+ // for the duration if body.
+ let needs_drop = type_needs_ordered_drop(cx, check_ty) || temporaries_need_ordered_drop(cx, let_expr);
+
+ // check that `while_let_on_iterator` lint does not trigger
+ if_chain! {
+ if keyword == "while";
+ if let ExprKind::MethodCall(method_path, _, _) = let_expr.kind;
+ if method_path.ident.name == sym::next;
+ if is_trait_method(cx, let_expr, sym::Iterator);
+ then {
+ return;
+ }
+ }
+
+ let result_expr = match &let_expr.kind {
+ ExprKind::AddrOf(_, _, borrowed) => borrowed,
+ ExprKind::Unary(UnOp::Deref, deref) => deref,
+ _ => let_expr,
+ };
+
+ span_lint_and_then(
+ cx,
+ REDUNDANT_PATTERN_MATCHING,
+ let_pat.span,
+ &format!("redundant pattern matching, consider using `{}`", good_method),
+ |diag| {
+ // if/while let ... = ... { ... }
+ // ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ let expr_span = expr.span;
+
+ // if/while let ... = ... { ... }
+ // ^^^
+ let op_span = result_expr.span.source_callsite();
+
+ // if/while let ... = ... { ... }
+ // ^^^^^^^^^^^^^^^^^^^
+ let span = expr_span.until(op_span.shrink_to_hi());
+
+ let app = if needs_drop {
+ Applicability::MaybeIncorrect
+ } else {
+ Applicability::MachineApplicable
+ };
+
+ let sugg = Sugg::hir_with_macro_callsite(cx, result_expr, "_")
+ .maybe_par()
+ .to_string();
+
+ diag.span_suggestion(span, "try this", format!("{} {}.{}", keyword, sugg, good_method), app);
+
+ if needs_drop {
+ diag.note("this will change drop order of the result, as well as all temporaries");
+ diag.note("add `#[allow(clippy::redundant_pattern_matching)]` if this is important");
+ }
+ },
+ );
+ }
+
+ fn find_sugg_for_match<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, op: &Expr<'_>, arms: &[Arm<'_>]) {
+ if arms.len() == 2 {
+ let node_pair = (&arms[0].pat.kind, &arms[1].pat.kind);
+
+ let found_good_method = match node_pair {
+ (
+ PatKind::TupleStruct(ref path_left, patterns_left, _),
+ PatKind::TupleStruct(ref path_right, patterns_right, _),
+ ) if patterns_left.len() == 1 && patterns_right.len() == 1 => {
+ if let (PatKind::Wild, PatKind::Wild) = (&patterns_left[0].kind, &patterns_right[0].kind) {
+ find_good_method_for_match(
+ cx,
+ arms,
+ path_left,
+ path_right,
+ &paths::RESULT_OK,
+ &paths::RESULT_ERR,
+ "is_ok()",
+ "is_err()",
+ )
+ .or_else(|| {
+ find_good_method_for_match(
+ cx,
+ arms,
+ path_left,
+ path_right,
+ &paths::IPADDR_V4,
+ &paths::IPADDR_V6,
+ "is_ipv4()",
+ "is_ipv6()",
+ )
+ })
+ } else {
+ None
+ }
+ },
+ (PatKind::TupleStruct(ref path_left, patterns, _), PatKind::Path(ref path_right))
+ | (PatKind::Path(ref path_left), PatKind::TupleStruct(ref path_right, patterns, _))
+ if patterns.len() == 1 =>
+ {
+ if let PatKind::Wild = patterns[0].kind {
+ find_good_method_for_match(
+ cx,
+ arms,
+ path_left,
+ path_right,
+ &paths::OPTION_SOME,
+ &paths::OPTION_NONE,
+ "is_some()",
+ "is_none()",
+ )
+ .or_else(|| {
+ find_good_method_for_match(
+ cx,
+ arms,
+ path_left,
+ path_right,
+ &paths::POLL_READY,
+ &paths::POLL_PENDING,
+ "is_ready()",
+ "is_pending()",
+ )
+ })
+ } else {
+ None
+ }
+ },
+ _ => None,
+ };
+
+ if let Some(good_method) = found_good_method {
+ let span = expr.span.to(op.span);
+ let result_expr = match &op.kind {
+ ExprKind::AddrOf(_, _, borrowed) => borrowed,
+ _ => op,
+ };
+ span_lint_and_then(
+ cx,
+ REDUNDANT_PATTERN_MATCHING,
+ expr.span,
+ &format!("redundant pattern matching, consider using `{}`", good_method),
+ |diag| {
+ diag.span_suggestion(
+ span,
+ "try this",
+ format!("{}.{}", snippet(cx, result_expr.span, "_"), good_method),
+ Applicability::MaybeIncorrect, // snippet
+ );
+ },
+ );
+ }
+ }
+ }
+
+ #[allow(clippy::too_many_arguments)]
+ fn find_good_method_for_match<'a>(
+ cx: &LateContext<'_>,
+ arms: &[Arm<'_>],
+ path_left: &QPath<'_>,
+ path_right: &QPath<'_>,
+ expected_left: &[&str],
+ expected_right: &[&str],
+ should_be_left: &'a str,
+ should_be_right: &'a str,
+ ) -> Option<&'a str> {
+ let body_node_pair = if is_qpath_def_path(cx, path_left, arms[0].pat.hir_id, expected_left)
+ && is_qpath_def_path(cx, path_right, arms[1].pat.hir_id, expected_right)
+ {
+ (&(*arms[0].body).kind, &(*arms[1].body).kind)
+ } else if is_qpath_def_path(cx, path_right, arms[1].pat.hir_id, expected_left)
+ && is_qpath_def_path(cx, path_left, arms[0].pat.hir_id, expected_right)
+ {
+ (&(*arms[1].body).kind, &(*arms[0].body).kind)
+ } else {
+ return None;
+ };
+
+ match body_node_pair {
+ (ExprKind::Lit(ref lit_left), ExprKind::Lit(ref lit_right)) => match (&lit_left.node, &lit_right.node) {
+ (LitKind::Bool(true), LitKind::Bool(false)) => Some(should_be_left),
+ (LitKind::Bool(false), LitKind::Bool(true)) => Some(should_be_right),
+ _ => None,
+ },
+ _ => None,
+ }
+ }
+}
+
+#[test]
+fn test_overlapping() {
+ use rustc_span::source_map::DUMMY_SP;
+
+ let sp = |s, e| SpannedRange {
+ span: DUMMY_SP,
+ node: (s, e),
+ };
+
+ assert_eq!(None, overlapping::<u8>(&[]));
+ assert_eq!(None, overlapping(&[sp(1, EndBound::Included(4))]));
+ assert_eq!(
+ None,
+ overlapping(&[sp(1, EndBound::Included(4)), sp(5, EndBound::Included(6))])
+ );
+ assert_eq!(
+ None,
+ overlapping(&[
+ sp(1, EndBound::Included(4)),
+ sp(5, EndBound::Included(6)),
+ sp(10, EndBound::Included(11))
+ ],)
+ );
+ assert_eq!(
+ Some((&sp(1, EndBound::Included(4)), &sp(3, EndBound::Included(6)))),
+ overlapping(&[sp(1, EndBound::Included(4)), sp(3, EndBound::Included(6))])
+ );
+ assert_eq!(
+ Some((&sp(5, EndBound::Included(6)), &sp(6, EndBound::Included(11)))),
+ overlapping(&[
+ sp(1, EndBound::Included(4)),
+ sp(5, EndBound::Included(6)),
+ sp(6, EndBound::Included(11))
+ ],)
+ );
+}
+
+/// Implementation of `MATCH_SAME_ARMS`.
+fn lint_match_arms<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) {
+ if let ExprKind::Match(_, arms, MatchSource::Normal) = expr.kind {
+ let hash = |&(_, arm): &(usize, &Arm<'_>)| -> u64 {
+ let mut h = SpanlessHash::new(cx);
+ h.hash_expr(arm.body);
+ h.finish()
+ };
+
+ let eq = |&(lindex, lhs): &(usize, &Arm<'_>), &(rindex, rhs): &(usize, &Arm<'_>)| -> bool {
+ let min_index = usize::min(lindex, rindex);
+ let max_index = usize::max(lindex, rindex);
+
+ let mut local_map: HirIdMap<HirId> = HirIdMap::default();
+ let eq_fallback = |a: &Expr<'_>, b: &Expr<'_>| {
+ if_chain! {
+ if let Some(a_id) = path_to_local(a);
+ if let Some(b_id) = path_to_local(b);
+ let entry = match local_map.entry(a_id) {
+ Entry::Vacant(entry) => entry,
+ // check if using the same bindings as before
+ Entry::Occupied(entry) => return *entry.get() == b_id,
+ };
+ // the names technically don't have to match; this makes the lint more conservative
+ if cx.tcx.hir().name(a_id) == cx.tcx.hir().name(b_id);
+ if TyS::same_type(cx.typeck_results().expr_ty(a), cx.typeck_results().expr_ty(b));
+ if pat_contains_local(lhs.pat, a_id);
+ if pat_contains_local(rhs.pat, b_id);
+ then {
+ entry.insert(b_id);
+ true
+ } else {
+ false
+ }
+ }
+ };
+ // Arms with a guard are ignored, those can’t always be merged together
+ // This is also the case for arms in-between each there is an arm with a guard
+ (min_index..=max_index).all(|index| arms[index].guard.is_none())
+ && SpanlessEq::new(cx)
+ .expr_fallback(eq_fallback)
+ .eq_expr(lhs.body, rhs.body)
+ // these checks could be removed to allow unused bindings
+ && bindings_eq(lhs.pat, local_map.keys().copied().collect())
+ && bindings_eq(rhs.pat, local_map.values().copied().collect())
+ };
+
+ let indexed_arms: Vec<(usize, &Arm<'_>)> = arms.iter().enumerate().collect();
+ for (&(_, i), &(_, j)) in search_same(&indexed_arms, hash, eq) {
+ span_lint_and_then(
+ cx,
+ MATCH_SAME_ARMS,
+ j.body.span,
+ "this `match` has identical arm bodies",
+ |diag| {
+ diag.span_note(i.body.span, "same as this");
+
+ // Note: this does not use `span_suggestion` on purpose:
+ // there is no clean way
+ // to remove the other arm. Building a span and suggest to replace it to ""
+ // makes an even more confusing error message. Also in order not to make up a
+ // span for the whole pattern, the suggestion is only shown when there is only
+ // one pattern. The user should know about `|` if they are already using it…
+
+ let lhs = snippet(cx, i.pat.span, "<pat1>");
+ let rhs = snippet(cx, j.pat.span, "<pat2>");
+
+ if let PatKind::Wild = j.pat.kind {
+ // if the last arm is _, then i could be integrated into _
+ // note that i.pat cannot be _, because that would mean that we're
+ // hiding all the subsequent arms, and rust won't compile
+ diag.span_note(
+ i.body.span,
+ &format!(
+ "`{}` has the same arm body as the `_` wildcard, consider removing it",
+ lhs
+ ),
+ );
+ } else {
+ diag.span_help(i.pat.span, &format!("consider refactoring into `{} | {}`", lhs, rhs,))
+ .help("...or consider changing the match arm bodies");
+ }
+ },
+ );
+ }
+ }
+}
+
+fn pat_contains_local(pat: &Pat<'_>, id: HirId) -> bool {
+ let mut result = false;
+ pat.walk_short(|p| {
+ result |= matches!(p.kind, PatKind::Binding(_, binding_id, ..) if binding_id == id);
+ !result
+ });
+ result
+}
+
+/// Returns true if all the bindings in the `Pat` are in `ids` and vice versa
+fn bindings_eq(pat: &Pat<'_>, mut ids: HirIdSet) -> bool {
+ let mut result = true;
+ pat.each_binding_or_first(&mut |_, id, _, _| result &= ids.remove(&id));
+ result && ids.is_empty()
+}
--- /dev/null
- && (method_name.ident.name == sym::as_str || method_name.ident.name == sym!(as_ref))
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::macros::{root_macro_call_first_node, FormatArgsExpn};
+use clippy_utils::source::snippet_with_applicability;
+use clippy_utils::ty::is_type_diagnostic_item;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_lint::LateContext;
+use rustc_middle::ty;
+use rustc_span::source_map::Span;
+use rustc_span::symbol::sym;
+use std::borrow::Cow;
+
+use super::EXPECT_FUN_CALL;
+
+/// Checks for the `EXPECT_FUN_CALL` lint.
+#[allow(clippy::too_many_lines)]
+pub(super) fn check<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &hir::Expr<'_>,
+ method_span: Span,
+ name: &str,
+ args: &'tcx [hir::Expr<'tcx>],
+) {
+ // Strip `&`, `as_ref()` and `as_str()` off `arg` until we're left with either a `String` or
+ // `&str`
+ fn get_arg_root<'a>(cx: &LateContext<'_>, arg: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
+ let mut arg_root = arg;
+ loop {
+ arg_root = match &arg_root.kind {
+ hir::ExprKind::AddrOf(hir::BorrowKind::Ref, _, expr) => expr,
+ hir::ExprKind::MethodCall(method_name, call_args, _) => {
+ if call_args.len() == 1
++ && (method_name.ident.name == sym::as_str || method_name.ident.name == sym::as_ref)
+ && {
+ let arg_type = cx.typeck_results().expr_ty(&call_args[0]);
+ let base_type = arg_type.peel_refs();
+ *base_type.kind() == ty::Str || is_type_diagnostic_item(cx, base_type, sym::String)
+ }
+ {
+ &call_args[0]
+ } else {
+ break;
+ }
+ },
+ _ => break,
+ };
+ }
+ arg_root
+ }
+
+ // Only `&'static str` or `String` can be used directly in the `panic!`. Other types should be
+ // converted to string.
+ fn requires_to_string(cx: &LateContext<'_>, arg: &hir::Expr<'_>) -> bool {
+ let arg_ty = cx.typeck_results().expr_ty(arg);
+ if is_type_diagnostic_item(cx, arg_ty, sym::String) {
+ return false;
+ }
+ if let ty::Ref(_, ty, ..) = arg_ty.kind() {
+ if *ty.kind() == ty::Str && can_be_static_str(cx, arg) {
+ return false;
+ }
+ };
+ true
+ }
+
+ // Check if an expression could have type `&'static str`, knowing that it
+ // has type `&str` for some lifetime.
+ fn can_be_static_str(cx: &LateContext<'_>, arg: &hir::Expr<'_>) -> bool {
+ match arg.kind {
+ hir::ExprKind::Lit(_) => true,
+ hir::ExprKind::Call(fun, _) => {
+ if let hir::ExprKind::Path(ref p) = fun.kind {
+ match cx.qpath_res(p, fun.hir_id) {
+ hir::def::Res::Def(hir::def::DefKind::Fn | hir::def::DefKind::AssocFn, def_id) => matches!(
+ cx.tcx.fn_sig(def_id).output().skip_binder().kind(),
+ ty::Ref(ty::ReStatic, ..)
+ ),
+ _ => false,
+ }
+ } else {
+ false
+ }
+ },
+ hir::ExprKind::MethodCall(..) => {
+ cx.typeck_results()
+ .type_dependent_def_id(arg.hir_id)
+ .map_or(false, |method_id| {
+ matches!(
+ cx.tcx.fn_sig(method_id).output().skip_binder().kind(),
+ ty::Ref(ty::ReStatic, ..)
+ )
+ })
+ },
+ hir::ExprKind::Path(ref p) => matches!(
+ cx.qpath_res(p, arg.hir_id),
+ hir::def::Res::Def(hir::def::DefKind::Const | hir::def::DefKind::Static, _)
+ ),
+ _ => false,
+ }
+ }
+
+ fn is_call(node: &hir::ExprKind<'_>) -> bool {
+ match node {
+ hir::ExprKind::AddrOf(hir::BorrowKind::Ref, _, expr) => {
+ is_call(&expr.kind)
+ },
+ hir::ExprKind::Call(..)
+ | hir::ExprKind::MethodCall(..)
+ // These variants are debatable or require further examination
+ | hir::ExprKind::If(..)
+ | hir::ExprKind::Match(..)
+ | hir::ExprKind::Block{ .. } => true,
+ _ => false,
+ }
+ }
+
+ if args.len() != 2 || name != "expect" || !is_call(&args[1].kind) {
+ return;
+ }
+
+ let receiver_type = cx.typeck_results().expr_ty_adjusted(&args[0]);
+ let closure_args = if is_type_diagnostic_item(cx, receiver_type, sym::Option) {
+ "||"
+ } else if is_type_diagnostic_item(cx, receiver_type, sym::Result) {
+ "|_|"
+ } else {
+ return;
+ };
+
+ let arg_root = get_arg_root(cx, &args[1]);
+
+ let span_replace_word = method_span.with_hi(expr.span.hi());
+
+ let mut applicability = Applicability::MachineApplicable;
+
+ //Special handling for `format!` as arg_root
+ if let Some(macro_call) = root_macro_call_first_node(cx, arg_root) {
+ if !cx.tcx.is_diagnostic_item(sym::format_macro, macro_call.def_id) {
+ return;
+ }
+ let Some(format_args) = FormatArgsExpn::find_nested(cx, arg_root, macro_call.expn) else { return };
+ let span = format_args.inputs_span();
+ let sugg = snippet_with_applicability(cx, span, "..", &mut applicability);
+ span_lint_and_sugg(
+ cx,
+ EXPECT_FUN_CALL,
+ span_replace_word,
+ &format!("use of `{}` followed by a function call", name),
+ "try this",
+ format!("unwrap_or_else({} panic!({}))", closure_args, sugg),
+ applicability,
+ );
+ return;
+ }
+
+ let mut arg_root_snippet: Cow<'_, _> = snippet_with_applicability(cx, arg_root.span, "..", &mut applicability);
+ if requires_to_string(cx, arg_root) {
+ arg_root_snippet.to_mut().push_str(".to_string()");
+ }
+
+ span_lint_and_sugg(
+ cx,
+ EXPECT_FUN_CALL,
+ span_replace_word,
+ &format!("use of `{}` followed by a function call", name),
+ "try this",
+ format!(
+ "unwrap_or_else({} {{ panic!(\"{{}}\", {}) }})",
+ closure_args, arg_root_snippet
+ ),
+ applicability,
+ );
+}
--- /dev/null
- ty::Term::Ty(ty) => ty,
- ty::Term::Const(_c) => continue,
+mod bind_instead_of_map;
+mod bytes_nth;
+mod chars_cmp;
+mod chars_cmp_with_unwrap;
+mod chars_last_cmp;
+mod chars_last_cmp_with_unwrap;
+mod chars_next_cmp;
+mod chars_next_cmp_with_unwrap;
+mod clone_on_copy;
+mod clone_on_ref_ptr;
+mod cloned_instead_of_copied;
+mod expect_fun_call;
+mod expect_used;
+mod extend_with_drain;
+mod filetype_is_file;
+mod filter_map;
+mod filter_map_identity;
+mod filter_map_next;
+mod filter_next;
+mod flat_map_identity;
+mod flat_map_option;
+mod from_iter_instead_of_collect;
+mod get_unwrap;
+mod implicit_clone;
+mod inefficient_to_string;
+mod inspect_for_each;
+mod into_iter_on_ref;
+mod iter_cloned_collect;
+mod iter_count;
+mod iter_next_slice;
+mod iter_nth;
+mod iter_nth_zero;
+mod iter_overeager_cloned;
+mod iter_skip_next;
+mod iterator_step_by_zero;
+mod manual_saturating_arithmetic;
+mod manual_str_repeat;
+mod map_collect_result_unit;
+mod map_flatten;
+mod map_identity;
+mod map_unwrap_or;
+mod ok_expect;
+mod option_as_ref_deref;
+mod option_map_or_none;
+mod option_map_unwrap_or;
+mod or_fun_call;
+mod search_is_some;
+mod single_char_add_str;
+mod single_char_insert_string;
+mod single_char_pattern;
+mod single_char_push_string;
+mod skip_while_next;
+mod str_splitn;
+mod string_extend_chars;
+mod suspicious_map;
+mod suspicious_splitn;
+mod uninit_assumed_init;
+mod unnecessary_filter_map;
+mod unnecessary_fold;
+mod unnecessary_iter_cloned;
+mod unnecessary_lazy_eval;
+mod unnecessary_to_owned;
+mod unwrap_or_else_default;
+mod unwrap_used;
+mod useless_asref;
+mod utils;
+mod wrong_self_convention;
+mod zst_offset;
+
+use bind_instead_of_map::BindInsteadOfMap;
+use clippy_utils::consts::{constant, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::ty::{contains_adt_constructor, contains_ty, implements_trait, is_copy, is_type_diagnostic_item};
+use clippy_utils::{contains_return, get_trait_def_id, iter_input_pats, meets_msrv, msrvs, paths, return_ty};
+use if_chain::if_chain;
+use rustc_hir as hir;
+use rustc_hir::def::Res;
+use rustc_hir::{Expr, ExprKind, PrimTy, QPath, TraitItem, TraitItemKind};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_middle::ty::{self, TraitRef, Ty, TyS};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::{sym, Span};
+use rustc_typeck::hir_ty_to_ty;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `cloned()` on an `Iterator` or `Option` where
+ /// `copied()` could be used instead.
+ ///
+ /// ### Why is this bad?
+ /// `copied()` is better because it guarantees that the type being cloned
+ /// implements `Copy`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1, 2, 3].iter().cloned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// [1, 2, 3].iter().copied();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub CLONED_INSTEAD_OF_COPIED,
+ pedantic,
+ "used `cloned` where `copied` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.cloned().<func>()` where call to `.cloned()` can be postponed.
+ ///
+ /// ### Why is this bad?
+ /// It's often inefficient to clone all elements of an iterator, when eventually, only some
+ /// of them will be consumed.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let vec = vec!["string".to_string()];
+ ///
+ /// // Bad
+ /// vec.iter().cloned().take(10);
+ ///
+ /// // Good
+ /// vec.iter().take(10).cloned();
+ ///
+ /// // Bad
+ /// vec.iter().cloned().last();
+ ///
+ /// // Good
+ /// vec.iter().last().cloned();
+ ///
+ /// ```
+ /// ### Known Problems
+ /// This `lint` removes the side of effect of cloning items in the iterator.
+ /// A code that relies on that side-effect could fail.
+ ///
+ #[clippy::version = "1.59.0"]
+ pub ITER_OVEREAGER_CLONED,
+ perf,
+ "using `cloned()` early with `Iterator::iter()` can lead to some performance inefficiencies"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
+ /// used instead.
+ ///
+ /// ### Why is this bad?
+ /// When applicable, `filter_map()` is more clear since it shows that
+ /// `Option` is used to produce 0 or 1 items.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().flat_map(|x| x.parse().ok()).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let nums: Vec<i32> = ["1", "2", "whee!"].iter().filter_map(|x| x.parse().ok()).collect();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub FLAT_MAP_OPTION,
+ pedantic,
+ "used `flat_map` where `filter_map` could be used instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.unwrap()` calls on `Option`s and on `Result`s.
+ ///
+ /// ### Why is this bad?
+ /// It is better to handle the `None` or `Err` case,
+ /// or at least call `.expect(_)` with a more helpful message. Still, for a lot of
+ /// quick-and-dirty code, `unwrap` is a good choice, which is why this lint is
+ /// `Allow` by default.
+ ///
+ /// `result.unwrap()` will let the thread panic on `Err` values.
+ /// Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// Even if you want to panic on errors, not all `Error`s implement good
+ /// messages on display. Therefore, it may be beneficial to look at the places
+ /// where they may get displayed. Activate this lint to do just that.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let opt = Some(1);
+ ///
+ /// // Bad
+ /// opt.unwrap();
+ ///
+ /// // Good
+ /// opt.expect("more helpful message");
+ /// ```
+ ///
+ /// // or
+ ///
+ /// ```rust
+ /// # let res: Result<usize, ()> = Ok(1);
+ ///
+ /// // Bad
+ /// res.unwrap();
+ ///
+ /// // Good
+ /// res.expect("more helpful message");
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub UNWRAP_USED,
+ restriction,
+ "using `.unwrap()` on `Result` or `Option`, which should at least get a better message using `expect()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.expect()` calls on `Option`s and `Result`s.
+ ///
+ /// ### Why is this bad?
+ /// Usually it is better to handle the `None` or `Err` case.
+ /// Still, for a lot of quick-and-dirty code, `expect` is a good choice, which is why
+ /// this lint is `Allow` by default.
+ ///
+ /// `result.expect()` will let the thread panic on `Err`
+ /// values. Normally, you want to implement more sophisticated error handling,
+ /// and propagate errors upwards with `?` operator.
+ ///
+ /// ### Examples
+ /// ```rust,ignore
+ /// # let opt = Some(1);
+ ///
+ /// // Bad
+ /// opt.expect("one");
+ ///
+ /// // Good
+ /// let opt = Some(1);
+ /// opt?;
+ /// ```
+ ///
+ /// // or
+ ///
+ /// ```rust
+ /// # let res: Result<usize, ()> = Ok(1);
+ ///
+ /// // Bad
+ /// res.expect("one");
+ ///
+ /// // Good
+ /// res?;
+ /// # Ok::<(), ()>(())
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub EXPECT_USED,
+ restriction,
+ "using `.expect()` on `Result` or `Option`, which might be better handled"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods that should live in a trait
+ /// implementation of a `std` trait (see [llogiq's blog
+ /// post](http://llogiq.github.io/2015/07/30/traits.html) for further
+ /// information) instead of an inherent implementation.
+ ///
+ /// ### Why is this bad?
+ /// Implementing the traits improve ergonomics for users of
+ /// the code, often with very little cost. Also people seeing a `mul(...)`
+ /// method
+ /// may expect `*` to work equally, so you should have good reason to disappoint
+ /// them.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct X;
+ /// impl X {
+ /// fn add(&self, other: &X) -> X {
+ /// // ..
+ /// # X
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SHOULD_IMPLEMENT_TRAIT,
+ style,
+ "defining a method that should be implementing a std trait"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for methods with certain name prefixes and which
+ /// doesn't match how self is taken. The actual rules are:
+ ///
+ /// |Prefix |Postfix |`self` taken | `self` type |
+ /// |-------|------------|-----------------------|--------------|
+ /// |`as_` | none |`&self` or `&mut self` | any |
+ /// |`from_`| none | none | any |
+ /// |`into_`| none |`self` | any |
+ /// |`is_` | none |`&self` or none | any |
+ /// |`to_` | `_mut` |`&mut self` | any |
+ /// |`to_` | not `_mut` |`self` | `Copy` |
+ /// |`to_` | not `_mut` |`&self` | not `Copy` |
+ ///
+ /// Note: Clippy doesn't trigger methods with `to_` prefix in:
+ /// - Traits definition.
+ /// Clippy can not tell if a type that implements a trait is `Copy` or not.
+ /// - Traits implementation, when `&self` is taken.
+ /// The method signature is controlled by the trait and often `&self` is required for all types that implement the trait
+ /// (see e.g. the `std::string::ToString` trait).
+ ///
+ /// Clippy allows `Pin<&Self>` and `Pin<&mut Self>` if `&self` and `&mut self` is required.
+ ///
+ /// Please find more info here:
+ /// https://rust-lang.github.io/api-guidelines/naming.html#ad-hoc-conversions-follow-as_-to_-into_-conventions-c-conv
+ ///
+ /// ### Why is this bad?
+ /// Consistency breeds readability. If you follow the
+ /// conventions, your users won't be surprised that they, e.g., need to supply a
+ /// mutable reference to a `as_..` function.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # struct X;
+ /// impl X {
+ /// fn as_str(self) -> &'static str {
+ /// // ..
+ /// # ""
+ /// }
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub WRONG_SELF_CONVENTION,
+ style,
+ "defining a method named with an established prefix (like \"into_\") that takes `self` with the wrong convention"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `ok().expect(..)`.
+ ///
+ /// ### Why is this bad?
+ /// Because you usually call `expect()` on the `Result`
+ /// directly to get a better error message.
+ ///
+ /// ### Known problems
+ /// The error type needs to implement `Debug`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let x = Ok::<_, ()>(());
+ ///
+ /// // Bad
+ /// x.ok().expect("why did I do this again?");
+ ///
+ /// // Good
+ /// x.expect("why did I do this again?");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OK_EXPECT,
+ style,
+ "using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `_.unwrap_or_else(Default::default)` on `Option` and
+ /// `Result` values.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written as `_.unwrap_or_default`, which is
+ /// simpler and more concise.
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let x = Some(1);
+ ///
+ /// // Bad
+ /// x.unwrap_or_else(Default::default);
+ /// x.unwrap_or_else(u32::default);
+ ///
+ /// // Good
+ /// x.unwrap_or_default();
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub UNWRAP_OR_ELSE_DEFAULT,
+ style,
+ "using `.unwrap_or_else(Default::default)`, which is more succinctly expressed as `.unwrap_or_default()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `option.map(_).unwrap_or(_)` or `option.map(_).unwrap_or_else(_)` or
+ /// `result.map(_).unwrap_or_else(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, these can be written more concisely (resp.) as
+ /// `option.map_or(_, _)`, `option.map_or_else(_, _)` and `result.map_or_else(_, _)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order
+ ///
+ /// ### Examples
+ /// ```rust
+ /// # let x = Some(1);
+ ///
+ /// // Bad
+ /// x.map(|a| a + 1).unwrap_or(0);
+ ///
+ /// // Good
+ /// x.map_or(0, |a| a + 1);
+ /// ```
+ ///
+ /// // or
+ ///
+ /// ```rust
+ /// # let x: Result<usize, ()> = Ok(1);
+ /// # fn some_function(foo: ()) -> usize { 1 }
+ ///
+ /// // Bad
+ /// x.map(|a| a + 1).unwrap_or_else(some_function);
+ ///
+ /// // Good
+ /// x.map_or_else(some_function, |a| a + 1);
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub MAP_UNWRAP_OR,
+ pedantic,
+ "using `.map(f).unwrap_or(a)` or `.map(f).unwrap_or_else(func)`, which are more succinctly expressed as `map_or(a, f)` or `map_or_else(a, f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, _)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.and_then(_)`.
+ ///
+ /// ### Known problems
+ /// The order of the arguments is not in execution order.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some(1);
+ ///
+ /// // Bad
+ /// opt.map_or(None, |a| Some(a + 1));
+ ///
+ /// // Good
+ /// opt.and_then(|a| Some(a + 1));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OPTION_MAP_OR_NONE,
+ style,
+ "using `Option.map_or(None, f)`, which is more succinctly expressed as `and_then(f)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map_or(None, Some)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ok()`.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.map_or(None, Some));
+ /// ```
+ ///
+ /// Good:
+ /// ```rust
+ /// # let r: Result<u32, &str> = Ok(1);
+ /// assert_eq!(Some(1), r.ok());
+ /// ```
+ #[clippy::version = "1.44.0"]
+ pub RESULT_MAP_OR_INTO_OPTION,
+ style,
+ "using `Result.map_or(None, Some)`, which is more succinctly expressed as `ok()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.and_then(|x| Some(y))`, `_.and_then(|x| Ok(y))` or
+ /// `_.or_else(|x| Err(y))`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.map(|x| y)` or `_.map_err(|x| y)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().and_then(|s| Some(s.len()));
+ /// let _ = res().and_then(|s| if s.len() == 42 { Ok(10) } else { Ok(20) });
+ /// let _ = res().or_else(|s| if s.len() == 42 { Err(10) } else { Err(20) });
+ /// ```
+ ///
+ /// The correct use would be:
+ ///
+ /// ```rust
+ /// # fn opt() -> Option<&'static str> { Some("42") }
+ /// # fn res() -> Result<&'static str, &'static str> { Ok("42") }
+ /// let _ = opt().map(|s| s.len());
+ /// let _ = res().map(|s| if s.len() == 42 { 10 } else { 20 });
+ /// let _ = res().map_err(|s| if s.len() == 42 { 10 } else { 20 });
+ /// ```
+ #[clippy::version = "1.45.0"]
+ pub BIND_INSTEAD_OF_MAP,
+ complexity,
+ "using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().filter(|x| **x == 0).next();
+ /// ```
+ /// Could be written as
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub FILTER_NEXT,
+ complexity,
+ "using `filter(p).next()`, which is more succinctly expressed as `.find(p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.skip_while(condition).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find(!condition)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().skip_while(|x| **x == 0).next();
+ /// ```
+ /// Could be written as
+ /// ```rust
+ /// # let vec = vec![1];
+ /// vec.iter().find(|x| **x != 0);
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub SKIP_WHILE_NEXT,
+ complexity,
+ "using `skip_while(p).next()`, which is more succinctly expressed as `.find(!p)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).flatten(_)` on `Iterator` and `Option`
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.flat_map(_)`
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec = vec![vec![1]];
+ ///
+ /// // Bad
+ /// vec.iter().map(|x| x.iter()).flatten();
+ ///
+ /// // Good
+ /// vec.iter().flat_map(|x| x.iter());
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub MAP_FLATTEN,
+ complexity,
+ "using combinations of `flatten` and `map` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter(_).map(_)` that can be written more simply
+ /// as `filter_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `filter` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust
+ /// (0_i32..10)
+ /// .filter(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Good:
+ /// ```rust
+ /// (0_i32..10).filter_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FILTER_MAP,
+ complexity,
+ "using `_.filter(_).map(_)` in a way that can be written more simply as `filter_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.find(_).map(_)` that can be written more simply
+ /// as `find_map(_)`.
+ ///
+ /// ### Why is this bad?
+ /// Redundant code in the `find` and `map` operations is poor style and
+ /// less performant.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust
+ /// (0_i32..10)
+ /// .find(|n| n.checked_add(1).is_some())
+ /// .map(|n| n.checked_add(1).unwrap());
+ /// ```
+ ///
+ /// Good:
+ /// ```rust
+ /// (0_i32..10).find_map(|n| n.checked_add(1));
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub MANUAL_FIND_MAP,
+ complexity,
+ "using `_.find(_).map(_)` in a way that can be written more simply as `find_map(_)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.filter_map(_).next()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.find_map(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).filter_map(|x| if x == 2 { Some(x) } else { None }).next();
+ /// ```
+ /// Can be written as
+ ///
+ /// ```rust
+ /// (0..3).find_map(|x| if x == 2 { Some(x) } else { None });
+ /// ```
+ #[clippy::version = "1.36.0"]
+ pub FILTER_MAP_NEXT,
+ pedantic,
+ "using combination of `filter_map` and `next` which can usually be written as a single method call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `flat_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flat_map(|x| x);
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let iter = vec![vec![0]].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub FLAT_MAP_IDENTITY,
+ complexity,
+ "call to `flat_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for an iterator or string search (such as `find()`,
+ /// `position()`, or `rposition()`) followed by a call to `is_some()` or `is_none()`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as:
+ /// * `_.any(_)`, or `_.contains(_)` for `is_some()`,
+ /// * `!_.any(_)`, or `!_.contains(_)` for `is_none()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let vec = vec![1];
+ /// vec.iter().find(|x| **x == 0).is_some();
+ ///
+ /// let _ = "hello world".find("world").is_none();
+ /// ```
+ /// Could be written as
+ /// ```rust
+ /// let vec = vec![1];
+ /// vec.iter().any(|x| *x == 0);
+ ///
+ /// let _ = !"hello world".contains("world");
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub SEARCH_IS_SOME,
+ complexity,
+ "using an iterator or string search followed by `is_some()` or `is_none()`, which is more succinctly expressed as a call to `any()` or `contains()` (with negation in case of `is_none()`)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.chars().next()` on a `str` to check
+ /// if it starts with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.starts_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let name = "foo";
+ /// if name.chars().next() == Some('_') {};
+ /// ```
+ /// Could be written as
+ /// ```rust
+ /// let name = "foo";
+ /// if name.starts_with('_') {};
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_NEXT_CMP,
+ style,
+ "using `.chars().next()` to check if a string starts with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.or(foo(..))`, `.unwrap_or(foo(..))`,
+ /// etc., and suggests to use `or_else`, `unwrap_or_else`, etc., or
+ /// `unwrap_or_default` instead.
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called and potentially
+ /// allocate an object acting as the default.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantic of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or(String::new());
+ /// ```
+ /// this can instead be written:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_else(String::new);
+ /// ```
+ /// or
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// foo.unwrap_or_default();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub OR_FUN_CALL,
+ perf,
+ "using any `*or` method with a function call, which suggests `*or_else`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `.expect(&format!(...))`, `.expect(foo(..))`,
+ /// etc., and suggests to use `unwrap_or_else` instead
+ ///
+ /// ### Why is this bad?
+ /// The function will always be called.
+ ///
+ /// ### Known problems
+ /// If the function has side-effects, not calling it will
+ /// change the semantics of the program, but you shouldn't rely on that anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.expect(&format!("Err {}: {}", err_code, err_msg));
+ /// ```
+ /// or
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.expect(format!("Err {}: {}", err_code, err_msg).as_str());
+ /// ```
+ /// this can instead be written:
+ /// ```rust
+ /// # let foo = Some(String::new());
+ /// # let err_code = "418";
+ /// # let err_msg = "I'm a teapot";
+ /// foo.unwrap_or_else(|| panic!("Err {}: {}", err_code, err_msg));
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub EXPECT_FUN_CALL,
+ perf,
+ "using any `expect` method with a function call"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a `Copy` type.
+ ///
+ /// ### Why is this bad?
+ /// The only reason `Copy` types implement `Clone` is for
+ /// generics, not for using the `clone` method on a concrete type.
+ ///
+ /// ### Example
+ /// ```rust
+ /// 42u64.clone();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_COPY,
+ complexity,
+ "using `clone` on a `Copy` type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on a ref-counted pointer,
+ /// (`Rc`, `Arc`, `rc::Weak`, or `sync::Weak`), and suggests calling Clone via unified
+ /// function syntax instead (e.g., `Rc::clone(foo)`).
+ ///
+ /// ### Why is this bad?
+ /// Calling '.clone()' on an Rc, Arc, or Weak
+ /// can obscure the fact that only the pointer is being cloned, not the underlying
+ /// data.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::rc::Rc;
+ /// let x = Rc::new(1);
+ ///
+ /// // Bad
+ /// x.clone();
+ ///
+ /// // Good
+ /// Rc::clone(&x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_ON_REF_PTR,
+ restriction,
+ "using 'clone' on a ref-counted pointer"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.clone()` on an `&&T`.
+ ///
+ /// ### Why is this bad?
+ /// Cloning an `&&T` copies the inner `&T`, instead of
+ /// cloning the underlying `T`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// let x = vec![1];
+ /// let y = &&x;
+ /// let z = y.clone();
+ /// println!("{:p} {:p}", *y, z); // prints out the same pointer
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CLONE_DOUBLE_REF,
+ correctness,
+ "using `clone` on `&&T`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.to_string()` on an `&&T` where
+ /// `T` implements `ToString` directly (like `&&str` or `&&String`).
+ ///
+ /// ### Why is this bad?
+ /// This bypasses the specialized implementation of
+ /// `ToString` and instead goes through the more expensive string formatting
+ /// facilities.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Generic implementation for `T: Display` is used (slow)
+ /// ["foo", "bar"].iter().map(|s| s.to_string());
+ ///
+ /// // OK, the specialized impl is used
+ /// ["foo", "bar"].iter().map(|&s| s.to_string());
+ /// ```
+ #[clippy::version = "1.40.0"]
+ pub INEFFICIENT_TO_STRING,
+ pedantic,
+ "using `to_string` on `&&T` where `T: ToString`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `new` not returning a type that contains `Self`.
+ ///
+ /// ### Why is this bad?
+ /// As a convention, `new` methods are used to make a new
+ /// instance of a type.
+ ///
+ /// ### Example
+ /// In an impl block:
+ /// ```rust
+ /// # struct Foo;
+ /// # struct NotAFoo;
+ /// impl Foo {
+ /// fn new() -> NotAFoo {
+ /// # NotAFoo
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// struct Bar(Foo);
+ /// impl Foo {
+ /// // Bad. The type name must contain `Self`
+ /// fn new() -> Bar {
+ /// # Bar(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// # struct Foo;
+ /// # struct FooError;
+ /// impl Foo {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Result<Foo, FooError> {
+ /// # Ok(Foo)
+ /// }
+ /// }
+ /// ```
+ ///
+ /// Or in a trait definition:
+ /// ```rust
+ /// pub trait Trait {
+ /// // Bad. The type name must contain `Self`
+ /// fn new();
+ /// }
+ /// ```
+ ///
+ /// ```rust
+ /// pub trait Trait {
+ /// // Good. Return type contains `Self`
+ /// fn new() -> Self;
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub NEW_RET_NO_SELF,
+ style,
+ "not returning type containing `Self` in a `new` method"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for string methods that receive a single-character
+ /// `str` as an argument, e.g., `_.split("x")`.
+ ///
+ /// ### Why is this bad?
+ /// Performing these methods using a `char` is faster than
+ /// using a `str`.
+ ///
+ /// ### Known problems
+ /// Does not catch multi-byte unicode characters.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // Bad
+ /// _.split("x");
+ ///
+ /// // Good
+ /// _.split('x');
+ #[clippy::version = "pre 1.29.0"]
+ pub SINGLE_CHAR_PATTERN,
+ perf,
+ "using a single-character str where a char could be used, e.g., `_.split(\"x\")`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calling `.step_by(0)` on iterators which panics.
+ ///
+ /// ### Why is this bad?
+ /// This very much looks like an oversight. Use `panic!()` instead if you
+ /// actually intend to panic.
+ ///
+ /// ### Example
+ /// ```rust,should_panic
+ /// for x in (0..100).step_by(0) {
+ /// //..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITERATOR_STEP_BY_ZERO,
+ correctness,
+ "using `Iterator::step_by(0)`, which will panic at runtime"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for indirect collection of populated `Option`
+ ///
+ /// ### Why is this bad?
+ /// `Option` is like a collection of 0-1 things, so `flatten`
+ /// automatically does this without suspicious-looking `unwrap` calls.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().filter(Option::is_some).map(Option::unwrap);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let _ = std::iter::empty::<Option<i32>>().flatten();
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub OPTION_FILTER_MAP,
+ complexity,
+ "filtering `Option` for `Some` then force-unwrapping, which can be one type-safe operation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `iter.nth(0)`.
+ ///
+ /// ### Why is this bad?
+ /// `iter.next()` is equivalent to
+ /// `iter.nth(0)`, as they both consume the next element,
+ /// but is more readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # use std::collections::HashSet;
+ /// // Bad
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().nth(0);
+ ///
+ /// // Good
+ /// # let mut s = HashSet::new();
+ /// # s.insert(1);
+ /// let x = s.iter().next();
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub ITER_NTH_ZERO,
+ style,
+ "replace `iter.nth(0)` with `iter.next()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.iter().nth()` (and the related
+ /// `.iter_mut().nth()`) on standard library types with *O*(1) element access.
+ ///
+ /// ### Why is this bad?
+ /// `.get()` and `.get_mut()` are more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.get(3);
+ /// let bad_slice = &some_vec[..].get(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_NTH,
+ perf,
+ "using `.iter().nth()` on a standard library type with O(1) element access"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.skip(x).next()` on iterators.
+ ///
+ /// ### Why is this bad?
+ /// `.nth(x)` is cleaner
+ ///
+ /// ### Example
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().skip(3).next();
+ /// let bad_slice = &some_vec[..].iter().skip(3).next();
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let bad_vec = some_vec.iter().nth(3);
+ /// let bad_slice = &some_vec[..].iter().nth(3);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_SKIP_NEXT,
+ style,
+ "using `.skip(x).next()` on an iterator"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for use of `.get().unwrap()` (or
+ /// `.get_mut().unwrap`) on a standard library type which implements `Index`
+ ///
+ /// ### Why is this bad?
+ /// Using the Index trait (`[]`) is more clear and more
+ /// concise.
+ ///
+ /// ### Known problems
+ /// Not a replacement for error handling: Using either
+ /// `.unwrap()` or the Index trait (`[]`) carries the risk of causing a `panic`
+ /// if the value being accessed is `None`. If the use of `.get().unwrap()` is a
+ /// temporary placeholder for dealing with the `Option` type, then this does
+ /// not mitigate the need for error handling. If there is a chance that `.get()`
+ /// will be `None` in your program, then it is advisable that the `None` case
+ /// is handled in a future refactor instead of using `.unwrap()` or the Index
+ /// trait.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec.get(3).unwrap();
+ /// *some_vec.get_mut(0).unwrap() = 1;
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let mut some_vec = vec![0, 1, 2, 3];
+ /// let last = some_vec[3];
+ /// some_vec[0] = 1;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub GET_UNWRAP,
+ restriction,
+ "using `.get().unwrap()` or `.get_mut().unwrap()` when using `[]` would work instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for occurrences where one vector gets extended instead of append
+ ///
+ /// ### Why is this bad?
+ /// Using `append` instead of `extend` is more concise and faster
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut a = vec![1, 2, 3];
+ /// let mut b = vec![4, 5, 6];
+ ///
+ /// // Bad
+ /// a.extend(b.drain(..));
+ ///
+ /// // Good
+ /// a.append(&mut b);
+ /// ```
+ #[clippy::version = "1.55.0"]
+ pub EXTEND_WITH_DRAIN,
+ perf,
+ "using vec.append(&mut vec) to move the full range of a vecor to another"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.extend(s.chars())` where s is a
+ /// `&str` or `String`.
+ ///
+ /// ### Why is this bad?
+ /// `.push_str(s)` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.extend(abc.chars());
+ /// s.extend(def.chars());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// let abc = "abc";
+ /// let def = String::from("def");
+ /// let mut s = String::new();
+ /// s.push_str(abc);
+ /// s.push_str(&def);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub STRING_EXTEND_CHARS,
+ style,
+ "using `x.extend(s.chars())` where s is a `&str` or `String`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.cloned().collect()` on slice to
+ /// create a `Vec`.
+ ///
+ /// ### Why is this bad?
+ /// `.to_vec()` is clearer
+ ///
+ /// ### Example
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s[..].iter().cloned().collect();
+ /// ```
+ /// The better use would be:
+ /// ```rust
+ /// let s = [1, 2, 3, 4, 5];
+ /// let s2: Vec<isize> = s.to_vec();
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub ITER_CLONED_COLLECT,
+ style,
+ "using `.cloned().collect()` on slice to create a `Vec`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.chars().last()` or
+ /// `_.chars().next_back()` on a `str` to check if it ends with a given char.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.ends_with(_)`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let name = "_";
+ ///
+ /// // Bad
+ /// name.chars().last() == Some('_') || name.chars().next_back() == Some('-');
+ ///
+ /// // Good
+ /// name.ends_with('_') || name.ends_with('-');
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CHARS_LAST_CMP,
+ style,
+ "using `.chars().last()` or `.chars().next_back()` to check if a string ends with a char"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `.as_ref()` or `.as_mut()` where the
+ /// types before and after the call are the same.
+ ///
+ /// ### Why is this bad?
+ /// The call is unnecessary.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x.as_ref());
+ /// ```
+ /// The correct use would be:
+ /// ```rust
+ /// # fn do_stuff(x: &[i32]) {}
+ /// let x: &[i32] = &[1, 2, 3, 4, 5];
+ /// do_stuff(x);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub USELESS_ASREF,
+ complexity,
+ "using `as_ref` where the types before and after the call are the same"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for using `fold` when a more succinct alternative exists.
+ /// Specifically, this checks for `fold`s which could be replaced by `any`, `all`,
+ /// `sum` or `product`.
+ ///
+ /// ### Why is this bad?
+ /// Readability.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).fold(false, |acc, x| acc || x > 2);
+ /// ```
+ /// This could be written as:
+ /// ```rust
+ /// let _ = (0..3).any(|x| x > 2);
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub UNNECESSARY_FOLD,
+ style,
+ "using `fold` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `filter_map` calls which could be replaced by `filter` or `map`.
+ /// More specifically it checks if the closure provided is only performing one of the
+ /// filter or map operations and suggests the appropriate option.
+ ///
+ /// ### Why is this bad?
+ /// Complexity. The intent is also clearer if only a single
+ /// operation is being performed.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).filter_map(|x| if x > 2 { Some(x) } else { None });
+ ///
+ /// // As there is no transformation of the argument this could be written as:
+ /// let _ = (0..3).filter(|&x| x > 2);
+ /// ```
+ ///
+ /// ```rust
+ /// let _ = (0..4).filter_map(|x| Some(x + 1));
+ ///
+ /// // As there is no conditional check on the argument this could be written as:
+ /// let _ = (0..4).map(|x| x + 1);
+ /// ```
+ #[clippy::version = "1.31.0"]
+ pub UNNECESSARY_FILTER_MAP,
+ complexity,
+ "using `filter_map` when a more succinct alternative exists"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `into_iter` calls on references which should be replaced by `iter`
+ /// or `iter_mut`.
+ ///
+ /// ### Why is this bad?
+ /// Readability. Calling `into_iter` on a reference will not move out its
+ /// content into the resulting iterator, which is confusing. It is better just call `iter` or
+ /// `iter_mut` directly.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let _ = (&vec![3, 4, 5]).into_iter();
+ ///
+ /// // Good
+ /// let _ = (&vec![3, 4, 5]).iter();
+ /// ```
+ #[clippy::version = "1.32.0"]
+ pub INTO_ITER_ON_REF,
+ style,
+ "using `.into_iter()` on a reference"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `map` followed by a `count`.
+ ///
+ /// ### Why is this bad?
+ /// It looks suspicious. Maybe `map` was confused with `filter`.
+ /// If the `map` call is intentional, this should be rewritten
+ /// using `inspect`. Or, if you intend to drive the iterator to
+ /// completion, you can just use `for_each` instead.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let _ = (0..3).map(|x| x + 2).count();
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub SUSPICIOUS_MAP,
+ suspicious,
+ "suspicious usage of map"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `MaybeUninit::uninit().assume_init()`.
+ ///
+ /// ### Why is this bad?
+ /// For most types, this is undefined behavior.
+ ///
+ /// ### Known problems
+ /// For now, we accept empty tuples and tuples / arrays
+ /// of `MaybeUninit`. There may be other types that allow uninitialized
+ /// data, but those are not yet rigorously defined.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Beware the UB
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: usize = unsafe { MaybeUninit::uninit().assume_init() };
+ /// ```
+ ///
+ /// Note that the following is OK:
+ ///
+ /// ```rust
+ /// use std::mem::MaybeUninit;
+ ///
+ /// let _: [MaybeUninit<bool>; 5] = unsafe {
+ /// MaybeUninit::uninit().assume_init()
+ /// };
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub UNINIT_ASSUMED_INIT,
+ correctness,
+ "`MaybeUninit::uninit().assume_init()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `.checked_add/sub(x).unwrap_or(MAX/MIN)`.
+ ///
+ /// ### Why is this bad?
+ /// These can be written simply with `saturating_add/sub` methods.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.checked_add(y).unwrap_or(u32::MAX);
+ /// let sub = x.checked_sub(y).unwrap_or(u32::MIN);
+ /// ```
+ ///
+ /// can be written using dedicated methods for saturating addition/subtraction as:
+ ///
+ /// ```rust
+ /// # let y: u32 = 0;
+ /// # let x: u32 = 100;
+ /// let add = x.saturating_add(y);
+ /// let sub = x.saturating_sub(y);
+ /// ```
+ #[clippy::version = "1.39.0"]
+ pub MANUAL_SATURATING_ARITHMETIC,
+ style,
+ "`.chcked_add/sub(x).unwrap_or(MAX/MIN)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `offset(_)`, `wrapping_`{`add`, `sub`}, etc. on raw pointers to
+ /// zero-sized types
+ ///
+ /// ### Why is this bad?
+ /// This is a no-op, and likely unintended
+ ///
+ /// ### Example
+ /// ```rust
+ /// unsafe { (&() as *const ()).offset(1) };
+ /// ```
+ #[clippy::version = "1.41.0"]
+ pub ZST_OFFSET,
+ correctness,
+ "Check for offset calculations on raw pointers to zero-sized types"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `FileType::is_file()`.
+ ///
+ /// ### Why is this bad?
+ /// When people testing a file type with `FileType::is_file`
+ /// they are testing whether a path is something they can get bytes from. But
+ /// `is_file` doesn't cover special file types in unix-like systems, and doesn't cover
+ /// symlink in windows. Using `!FileType::is_dir()` is a better way to that intention.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if filetype.is_file() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ ///
+ /// should be written as:
+ ///
+ /// ```rust
+ /// # || {
+ /// let metadata = std::fs::metadata("foo.txt")?;
+ /// let filetype = metadata.file_type();
+ ///
+ /// if !filetype.is_dir() {
+ /// // read file
+ /// }
+ /// # Ok::<_, std::io::Error>(())
+ /// # };
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub FILETYPE_IS_FILE,
+ restriction,
+ "`FileType::is_file` is not recommended to test for readable file type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.as_ref().map(Deref::deref)` or it's aliases (such as String::as_str).
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely as
+ /// `_.as_deref()`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_ref().map(String::as_str)
+ /// # ;
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// # let opt = Some("".to_string());
+ /// opt.as_deref()
+ /// # ;
+ /// ```
+ #[clippy::version = "1.42.0"]
+ pub OPTION_AS_REF_DEREF,
+ complexity,
+ "using `as_ref().map(Deref::deref)`, which is more succinctly expressed as `as_deref()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `iter().next()` on a Slice or an Array
+ ///
+ /// ### Why is this bad?
+ /// These can be shortened into `.get()`
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a[2..].iter().next();
+ /// b.iter().next();
+ /// ```
+ /// should be written as:
+ /// ```rust
+ /// # let a = [1, 2, 3];
+ /// # let b = vec![1, 2, 3];
+ /// a.get(2);
+ /// b.get(0);
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub ITER_NEXT_SLICE,
+ style,
+ "using `.iter().next()` on a sliced array, which can be shortened to just `.get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Warns when using `push_str`/`insert_str` with a single-character string literal
+ /// where `push`/`insert` with a `char` would work fine.
+ ///
+ /// ### Why is this bad?
+ /// It's less clear that we are pushing a single character.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut string = String::new();
+ /// string.insert_str(0, "R");
+ /// string.push_str("R");
+ /// ```
+ /// Could be written as
+ /// ```rust
+ /// let mut string = String::new();
+ /// string.insert(0, 'R');
+ /// string.push('R');
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub SINGLE_CHAR_ADD_STR,
+ style,
+ "`push_str()` or `insert_str()` used with a single-character string literal as parameter"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// As the counterpart to `or_fun_call`, this lint looks for unnecessary
+ /// lazily evaluated closures on `Option` and `Result`.
+ ///
+ /// This lint suggests changing the following functions, when eager evaluation results in
+ /// simpler code:
+ /// - `unwrap_or_else` to `unwrap_or`
+ /// - `and_then` to `and`
+ /// - `or_else` to `or`
+ /// - `get_or_insert_with` to `get_or_insert`
+ /// - `ok_or_else` to `ok_or`
+ ///
+ /// ### Why is this bad?
+ /// Using eager evaluation is shorter and simpler in some cases.
+ ///
+ /// ### Known problems
+ /// It is possible, but not recommended for `Deref` and `Index` to have
+ /// side effects. Eagerly evaluating them can change the semantics of the program.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // example code where clippy issues a warning
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or_else(|| 42);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let opt: Option<u32> = None;
+ ///
+ /// opt.unwrap_or(42);
+ /// ```
+ #[clippy::version = "1.48.0"]
+ pub UNNECESSARY_LAZY_EVALUATIONS,
+ style,
+ "using unnecessary lazy evaluation, which can be replaced with simpler eager evaluation"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `_.map(_).collect::<Result<(), _>()`.
+ ///
+ /// ### Why is this bad?
+ /// Using `try_for_each` instead is more readable and idiomatic.
+ ///
+ /// ### Example
+ /// ```rust
+ /// (0..3).map(|t| Err(t)).collect::<Result<(), _>>();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// (0..3).try_for_each(|t| Err(t));
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub MAP_COLLECT_RESULT_UNIT,
+ style,
+ "using `.map(_).collect::<Result<(),_>()`, which can be replaced with `try_for_each`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `from_iter()` function calls on types that implement the `FromIterator`
+ /// trait.
+ ///
+ /// ### Why is this bad?
+ /// It is recommended style to use collect. See
+ /// [FromIterator documentation](https://doc.rust-lang.org/std/iter/trait.FromIterator.html)
+ ///
+ /// ### Example
+ /// ```rust
+ /// use std::iter::FromIterator;
+ ///
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v = Vec::from_iter(five_fives);
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let five_fives = std::iter::repeat(5).take(5);
+ ///
+ /// let v: Vec<i32> = five_fives.collect();
+ ///
+ /// assert_eq!(v, vec![5, 5, 5, 5, 5]);
+ /// ```
+ #[clippy::version = "1.49.0"]
+ pub FROM_ITER_INSTEAD_OF_COLLECT,
+ pedantic,
+ "use `.collect()` instead of `::from_iter()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `inspect().for_each()`.
+ ///
+ /// ### Why is this bad?
+ /// It is the same as performing the computation
+ /// inside `inspect` at the beginning of the closure in `for_each`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .inspect(|&x| println!("inspect the number: {}", x))
+ /// .for_each(|&x| {
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ /// Can be written as
+ /// ```rust
+ /// [1,2,3,4,5].iter()
+ /// .for_each(|&x| {
+ /// println!("inspect the number: {}", x);
+ /// assert!(x >= 0);
+ /// });
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub INSPECT_FOR_EACH,
+ complexity,
+ "using `.inspect().for_each()`, which can be replaced with `.for_each()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `filter_map(|x| x)`.
+ ///
+ /// ### Why is this bad?
+ /// Readability, this can be written more concisely by using `flatten`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.filter_map(|x| x);
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// # let iter = vec![Some(1)].into_iter();
+ /// iter.flatten();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub FILTER_MAP_IDENTITY,
+ complexity,
+ "call to `filter_map` where `flatten` is sufficient"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for instances of `map(f)` where `f` is the identity function.
+ ///
+ /// ### Why is this bad?
+ /// It can be written more concisely without the call to `map`.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| x).map(|x| 2*x).collect();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let x = [1, 2, 3];
+ /// let y: Vec<_> = x.iter().map(|x| 2*x).collect();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub MAP_IDENTITY,
+ complexity,
+ "using iterator.map(|x| x)"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.bytes().nth()`.
+ ///
+ /// ### Why is this bad?
+ /// `.as_bytes().get()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let _ = "Hello".bytes().nth(3);
+ ///
+ /// // Good
+ /// let _ = "Hello".as_bytes().get(3);
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub BYTES_NTH,
+ style,
+ "replace `.bytes().nth()` with `.as_bytes().get()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the usage of `_.to_owned()`, `vec.to_vec()`, or similar when calling `_.clone()` would be clearer.
+ ///
+ /// ### Why is this bad?
+ /// These methods do the same thing as `_.clone()` but may be confusing as
+ /// to why we are calling `to_vec` on something that is already a `Vec` or calling `to_owned` on something that is already owned.
+ ///
+ /// ### Example
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.to_vec();
+ /// let c = a.to_owned();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let a = vec![1, 2, 3];
+ /// let b = a.clone();
+ /// let c = a.clone();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub IMPLICIT_CLONE,
+ pedantic,
+ "implicitly cloning a value by invoking a function on its dereferenced type"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for the use of `.iter().count()`.
+ ///
+ /// ### Why is this bad?
+ /// `.len()` is more efficient and more
+ /// readable.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let _ = some_vec.iter().count();
+ /// let _ = &some_vec[..].iter().count();
+ ///
+ /// // Good
+ /// let some_vec = vec![0, 1, 2, 3];
+ /// let _ = some_vec.len();
+ /// let _ = &some_vec[..].len();
+ /// ```
+ #[clippy::version = "1.52.0"]
+ pub ITER_COUNT,
+ complexity,
+ "replace `.iter().count()` with `.len()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to [`splitn`]
+ /// (https://doc.rust-lang.org/std/primitive.str.html#method.splitn) and
+ /// related functions with either zero or one splits.
+ ///
+ /// ### Why is this bad?
+ /// These calls don't actually split the value and are
+ /// likely to be intended as a different number.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let s = "";
+ /// for x in s.splitn(1, ":") {
+ /// // use x
+ /// }
+ ///
+ /// // Good
+ /// let s = "";
+ /// for x in s.splitn(2, ":") {
+ /// // use x
+ /// }
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub SUSPICIOUS_SPLITN,
+ correctness,
+ "checks for `.splitn(0, ..)` and `.splitn(1, ..)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for manual implementations of `str::repeat`
+ ///
+ /// ### Why is this bad?
+ /// These are both harder to read, as well as less performant.
+ ///
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let x: String = std::iter::repeat('x').take(10).collect();
+ ///
+ /// // Good
+ /// let x: String = "x".repeat(10);
+ /// ```
+ #[clippy::version = "1.54.0"]
+ pub MANUAL_STR_REPEAT,
+ perf,
+ "manual implementation of `str::repeat`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn(2, _)`
+ ///
+ /// ### Why is this bad?
+ /// `split_once` is both clearer in intent and slightly more efficient.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // Bad
+ /// let (key, value) = _.splitn(2, '=').next_tuple()?;
+ /// let value = _.splitn(2, '=').nth(1)?;
+ ///
+ /// // Good
+ /// let (key, value) = _.split_once('=')?;
+ /// let value = _.split_once('=')?.1;
+ /// ```
+ #[clippy::version = "1.57.0"]
+ pub MANUAL_SPLIT_ONCE,
+ complexity,
+ "replace `.splitn(2, pat)` with `.split_once(pat)`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usages of `str::splitn` (or `str::rsplitn`) where using `str::split` would be the same.
+ /// ### Why is this bad?
+ /// The function `split` is simpler and there is no performance difference in these cases, considering
+ /// that both functions return a lazy iterator.
+ /// ### Example
+ /// ```rust
+ /// // Bad
+ /// let str = "key=value=add";
+ /// let _ = str.splitn(3, '=').next().unwrap();
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// // Good
+ /// let str = "key=value=add";
+ /// let _ = str.split('=').next().unwrap();
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub NEEDLESS_SPLITN,
+ complexity,
+ "usages of `str::splitn` that can be replaced with `str::split`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary calls to [`ToOwned::to_owned`](https://doc.rust-lang.org/std/borrow/trait.ToOwned.html#tymethod.to_owned)
+ /// and other `to_owned`-like functions.
+ ///
+ /// ### Why is this bad?
+ /// The unnecessary calls result in useless allocations.
+ ///
+ /// ### Known problems
+ /// `unnecessary_to_owned` can falsely trigger if `IntoIterator::into_iter` is applied to an
+ /// owned copy of a resource and the resource is later used mutably. See
+ /// [#8148](https://github.com/rust-lang/rust-clippy/issues/8148).
+ ///
+ /// ### Example
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy().to_string());
+ /// fn foo(s: &str) {}
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// let path = std::path::Path::new("x");
+ /// foo(&path.to_string_lossy());
+ /// fn foo(s: &str) {}
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub UNNECESSARY_TO_OWNED,
+ perf,
+ "unnecessary calls to `to_owned`-like functions"
+}
+
+pub struct Methods {
+ avoid_breaking_exported_api: bool,
+ msrv: Option<RustcVersion>,
+}
+
+impl Methods {
+ #[must_use]
+ pub fn new(avoid_breaking_exported_api: bool, msrv: Option<RustcVersion>) -> Self {
+ Self {
+ avoid_breaking_exported_api,
+ msrv,
+ }
+ }
+}
+
+impl_lint_pass!(Methods => [
+ UNWRAP_USED,
+ EXPECT_USED,
+ SHOULD_IMPLEMENT_TRAIT,
+ WRONG_SELF_CONVENTION,
+ OK_EXPECT,
+ UNWRAP_OR_ELSE_DEFAULT,
+ MAP_UNWRAP_OR,
+ RESULT_MAP_OR_INTO_OPTION,
+ OPTION_MAP_OR_NONE,
+ BIND_INSTEAD_OF_MAP,
+ OR_FUN_CALL,
+ EXPECT_FUN_CALL,
+ CHARS_NEXT_CMP,
+ CHARS_LAST_CMP,
+ CLONE_ON_COPY,
+ CLONE_ON_REF_PTR,
+ CLONE_DOUBLE_REF,
+ ITER_OVEREAGER_CLONED,
+ CLONED_INSTEAD_OF_COPIED,
+ FLAT_MAP_OPTION,
+ INEFFICIENT_TO_STRING,
+ NEW_RET_NO_SELF,
+ SINGLE_CHAR_PATTERN,
+ SINGLE_CHAR_ADD_STR,
+ SEARCH_IS_SOME,
+ FILTER_NEXT,
+ SKIP_WHILE_NEXT,
+ FILTER_MAP_IDENTITY,
+ MAP_IDENTITY,
+ MANUAL_FILTER_MAP,
+ MANUAL_FIND_MAP,
+ OPTION_FILTER_MAP,
+ FILTER_MAP_NEXT,
+ FLAT_MAP_IDENTITY,
+ MAP_FLATTEN,
+ ITERATOR_STEP_BY_ZERO,
+ ITER_NEXT_SLICE,
+ ITER_COUNT,
+ ITER_NTH,
+ ITER_NTH_ZERO,
+ BYTES_NTH,
+ ITER_SKIP_NEXT,
+ GET_UNWRAP,
+ STRING_EXTEND_CHARS,
+ ITER_CLONED_COLLECT,
+ USELESS_ASREF,
+ UNNECESSARY_FOLD,
+ UNNECESSARY_FILTER_MAP,
+ INTO_ITER_ON_REF,
+ SUSPICIOUS_MAP,
+ UNINIT_ASSUMED_INIT,
+ MANUAL_SATURATING_ARITHMETIC,
+ ZST_OFFSET,
+ FILETYPE_IS_FILE,
+ OPTION_AS_REF_DEREF,
+ UNNECESSARY_LAZY_EVALUATIONS,
+ MAP_COLLECT_RESULT_UNIT,
+ FROM_ITER_INSTEAD_OF_COLLECT,
+ INSPECT_FOR_EACH,
+ IMPLICIT_CLONE,
+ SUSPICIOUS_SPLITN,
+ MANUAL_STR_REPEAT,
+ EXTEND_WITH_DRAIN,
+ MANUAL_SPLIT_ONCE,
+ NEEDLESS_SPLITN,
+ UNNECESSARY_TO_OWNED,
+]);
+
+/// Extracts a method call name, args, and `Span` of the method name.
+fn method_call<'tcx>(recv: &'tcx hir::Expr<'tcx>) -> Option<(&'tcx str, &'tcx [hir::Expr<'tcx>], Span)> {
+ if let ExprKind::MethodCall(path, args, _) = recv.kind {
+ if !args.iter().any(|e| e.span.from_expansion()) {
+ let name = path.ident.name.as_str();
+ return Some((name, args, path.ident.span));
+ }
+ }
+ None
+}
+
+impl<'tcx> LateLintPass<'tcx> for Methods {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if expr.span.from_expansion() {
+ return;
+ }
+
+ check_methods(cx, expr, self.msrv.as_ref());
+
+ match expr.kind {
+ hir::ExprKind::Call(func, args) => {
+ from_iter_instead_of_collect::check(cx, expr, args, func);
+ },
+ hir::ExprKind::MethodCall(method_call, args, _) => {
+ let method_span = method_call.ident.span;
+ or_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), args);
+ expect_fun_call::check(cx, expr, method_span, method_call.ident.as_str(), args);
+ clone_on_copy::check(cx, expr, method_call.ident.name, args);
+ clone_on_ref_ptr::check(cx, expr, method_call.ident.name, args);
+ inefficient_to_string::check(cx, expr, method_call.ident.name, args);
+ single_char_add_str::check(cx, expr, args);
+ into_iter_on_ref::check(cx, expr, method_span, method_call.ident.name, args);
+ single_char_pattern::check(cx, expr, method_call.ident.name, args);
+ unnecessary_to_owned::check(cx, expr, method_call.ident.name, args);
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) if op.node == hir::BinOpKind::Eq || op.node == hir::BinOpKind::Ne => {
+ let mut info = BinaryExprInfo {
+ expr,
+ chain: lhs,
+ other: rhs,
+ eq: op.node == hir::BinOpKind::Eq,
+ };
+ lint_binary_expr_with_method_call(cx, &mut info);
+ },
+ _ => (),
+ }
+ }
+
+ #[allow(clippy::too_many_lines)]
+ fn check_impl_item(&mut self, cx: &LateContext<'tcx>, impl_item: &'tcx hir::ImplItem<'_>) {
+ if in_external_macro(cx.sess(), impl_item.span) {
+ return;
+ }
+ let name = impl_item.ident.name.as_str();
+ let parent = cx.tcx.hir().get_parent_item(impl_item.hir_id());
+ let item = cx.tcx.hir().expect_item(parent);
+ let self_ty = cx.tcx.type_of(item.def_id);
+
+ let implements_trait = matches!(item.kind, hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }));
+ if_chain! {
+ if let hir::ImplItemKind::Fn(ref sig, id) = impl_item.kind;
+ if let Some(first_arg) = iter_input_pats(sig.decl, cx.tcx.hir().body(id)).next();
+
+ let method_sig = cx.tcx.fn_sig(impl_item.def_id);
+ let method_sig = cx.tcx.erase_late_bound_regions(method_sig);
+
+ let first_arg_ty = &method_sig.inputs().iter().next();
+
+ // check conventions w.r.t. conversion method names and predicates
+ if let Some(first_arg_ty) = first_arg_ty;
+
+ then {
+ // if this impl block implements a trait, lint in trait definition instead
+ if !implements_trait && cx.access_levels.is_exported(impl_item.def_id) {
+ // check missing trait implementations
+ for method_config in &TRAIT_METHODS {
+ if name == method_config.method_name &&
+ sig.decl.inputs.len() == method_config.param_count &&
+ method_config.output_type.matches(&sig.decl.output) &&
+ method_config.self_kind.matches(cx, self_ty, first_arg_ty) &&
+ fn_header_equals(method_config.fn_header, sig.header) &&
+ method_config.lifetime_param_cond(impl_item)
+ {
+ span_lint_and_help(
+ cx,
+ SHOULD_IMPLEMENT_TRAIT,
+ impl_item.span,
+ &format!(
+ "method `{}` can be confused for the standard trait method `{}::{}`",
+ method_config.method_name,
+ method_config.trait_name,
+ method_config.method_name
+ ),
+ None,
+ &format!(
+ "consider implementing the trait `{}` or choosing a less ambiguous method name",
+ method_config.trait_name
+ )
+ );
+ }
+ }
+ }
+
+ if sig.decl.implicit_self.has_implicit_self()
+ && !(self.avoid_breaking_exported_api
+ && cx.access_levels.is_exported(impl_item.def_id))
+ {
+ wrong_self_convention::check(
+ cx,
+ name,
+ self_ty,
+ first_arg_ty,
+ first_arg.pat.span,
+ implements_trait,
+ false
+ );
+ }
+ }
+ }
+
+ // if this impl block implements a trait, lint in trait definition instead
+ if implements_trait {
+ return;
+ }
+
+ if let hir::ImplItemKind::Fn(_, _) = impl_item.kind {
+ let ret_ty = return_ty(cx, impl_item.hir_id());
+
+ // walk the return type and check for Self (this does not check associated types)
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(ret_ty, self_adt) {
+ return;
+ }
+ } else if contains_ty(ret_ty, self_ty) {
+ return;
+ }
+
+ // if return type is impl trait, check the associated types
+ if let ty::Opaque(def_id, _) = *ret_ty.kind() {
+ // one of the associated types must be Self
+ for &(predicate, _span) in cx.tcx.explicit_item_bounds(def_id) {
+ if let ty::PredicateKind::Projection(projection_predicate) = predicate.kind().skip_binder() {
+ let assoc_ty = match projection_predicate.term {
++ ty::Term::Ty(ty) => ty,
++ ty::Term::Const(_c) => continue,
+ };
+ // walk the associated type and check for Self
+ if let Some(self_adt) = self_ty.ty_adt_def() {
+ if contains_adt_constructor(assoc_ty, self_adt) {
+ return;
+ }
+ } else if contains_ty(assoc_ty, self_ty) {
+ return;
+ }
+ }
+ }
+ }
+
+ if name == "new" && !TyS::same_type(ret_ty, self_ty) {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ impl_item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
+ if in_external_macro(cx.tcx.sess, item.span) {
+ return;
+ }
+
+ if_chain! {
+ if let TraitItemKind::Fn(ref sig, _) = item.kind;
+ if sig.decl.implicit_self.has_implicit_self();
+ if let Some(first_arg_ty) = sig.decl.inputs.iter().next();
+
+ then {
+ let first_arg_span = first_arg_ty.span;
+ let first_arg_ty = hir_ty_to_ty(cx.tcx, first_arg_ty);
+ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
+ wrong_self_convention::check(
+ cx,
+ item.ident.name.as_str(),
+ self_ty,
+ first_arg_ty,
+ first_arg_span,
+ false,
+ true
+ );
+ }
+ }
+
+ if_chain! {
+ if item.ident.name == sym::new;
+ if let TraitItemKind::Fn(_, _) = item.kind;
+ let ret_ty = return_ty(cx, item.hir_id());
+ let self_ty = TraitRef::identity(cx.tcx, item.def_id.to_def_id()).self_ty().skip_binder();
+ if !contains_ty(ret_ty, self_ty);
+
+ then {
+ span_lint(
+ cx,
+ NEW_RET_NO_SELF,
+ item.span,
+ "methods called `new` usually return `Self`",
+ );
+ }
+ }
+ }
+
+ extract_msrv_attr!(LateContext);
+}
+
+#[allow(clippy::too_many_lines)]
+fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Option<&RustcVersion>) {
+ if let Some((name, [recv, args @ ..], span)) = method_call(expr) {
+ match (name, args) {
+ ("add" | "offset" | "sub" | "wrapping_offset" | "wrapping_add" | "wrapping_sub", [_arg]) => {
+ zst_offset::check(cx, expr, recv);
+ },
+ ("and_then", [arg]) => {
+ let biom_option_linted = bind_instead_of_map::OptionAndThenSome::check(cx, expr, recv, arg);
+ let biom_result_linted = bind_instead_of_map::ResultAndThenOk::check(cx, expr, recv, arg);
+ if !biom_option_linted && !biom_result_linted {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "and");
+ }
+ },
+ ("as_mut", []) => useless_asref::check(cx, expr, "as_mut", recv),
+ ("as_ref", []) => useless_asref::check(cx, expr, "as_ref", recv),
+ ("assume_init", []) => uninit_assumed_init::check(cx, expr, recv),
+ ("cloned", []) => cloned_instead_of_copied::check(cx, expr, recv, span, msrv),
+ ("collect", []) => match method_call(recv) {
+ Some((name @ ("cloned" | "copied"), [recv2], _)) => {
+ iter_cloned_collect::check(cx, name, expr, recv2);
+ },
+ Some(("map", [m_recv, m_arg], _)) => {
+ map_collect_result_unit::check(cx, expr, m_recv, m_arg, recv);
+ },
+ Some(("take", [take_self_arg, take_arg], _)) => {
+ if meets_msrv(msrv, &msrvs::STR_REPEAT) {
+ manual_str_repeat::check(cx, expr, recv, take_self_arg, take_arg);
+ }
+ },
+ _ => {},
+ },
+ (name @ "count", args @ []) => match method_call(recv) {
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
+ Some((name2 @ ("into_iter" | "iter" | "iter_mut"), [recv2], _)) => {
+ iter_count::check(cx, expr, recv2, name2);
+ },
+ Some(("map", [_, arg], _)) => suspicious_map::check(cx, expr, recv, arg),
+ _ => {},
+ },
+ ("expect", [_]) => match method_call(recv) {
+ Some(("ok", [recv], _)) => ok_expect::check(cx, expr, recv),
+ _ => expect_used::check(cx, expr, recv),
+ },
+ ("extend", [arg]) => {
+ string_extend_chars::check(cx, expr, recv, arg);
+ extend_with_drain::check(cx, expr, recv, arg);
+ },
+ ("filter_map", [arg]) => {
+ unnecessary_filter_map::check(cx, expr, arg);
+ filter_map_identity::check(cx, expr, arg, span);
+ },
+ ("flat_map", [arg]) => {
+ flat_map_identity::check(cx, expr, arg, span);
+ flat_map_option::check(cx, expr, arg, span);
+ },
+ (name @ "flatten", args @ []) => match method_call(recv) {
+ Some(("map", [recv, map_arg], _)) => map_flatten::check(cx, expr, recv, map_arg),
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
+ _ => {},
+ },
+ ("fold", [init, acc]) => unnecessary_fold::check(cx, expr, init, acc, span),
+ ("for_each", [_]) => {
+ if let Some(("inspect", [_, _], span2)) = method_call(recv) {
+ inspect_for_each::check(cx, expr, span2);
+ }
+ },
+ ("get_or_insert_with", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "get_or_insert"),
+ ("is_file", []) => filetype_is_file::check(cx, expr, recv),
+ ("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
+ ("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
+ ("last", args @ []) | ("skip", args @ [_]) => {
+ if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv2, name, args);
+ }
+ }
+ },
+ ("map", [m_arg]) => {
+ if let Some((name, [recv2, args @ ..], span2)) = method_call(recv) {
+ match (name, args) {
+ ("as_mut", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, true, msrv),
+ ("as_ref", []) => option_as_ref_deref::check(cx, expr, recv2, m_arg, false, msrv),
+ ("filter", [f_arg]) => {
+ filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, false);
+ },
+ ("find", [f_arg]) => filter_map::check(cx, expr, recv2, f_arg, span2, recv, m_arg, span, true),
+ _ => {},
+ }
+ }
+ map_identity::check(cx, expr, recv, m_arg, span);
+ },
+ ("map_or", [def, map]) => option_map_or_none::check(cx, expr, recv, def, map),
+ (name @ "next", args @ []) => {
+ if let Some((name2, [recv2, args2 @ ..], _)) = method_call(recv) {
+ match (name2, args2) {
+ ("cloned", []) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
+ ("filter", [arg]) => filter_next::check(cx, expr, recv2, arg),
+ ("filter_map", [arg]) => filter_map_next::check(cx, expr, recv2, arg, msrv),
+ ("iter", []) => iter_next_slice::check(cx, expr, recv2),
+ ("skip", [arg]) => iter_skip_next::check(cx, expr, recv2, arg),
+ ("skip_while", [_]) => skip_while_next::check(cx, expr),
+ _ => {},
+ }
+ }
+ },
+ ("nth", args @ [n_arg]) => match method_call(recv) {
+ Some(("bytes", [recv2], _)) => bytes_nth::check(cx, expr, recv2, n_arg),
+ Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
+ Some(("iter", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, false),
+ Some(("iter_mut", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, true),
+ _ => iter_nth_zero::check(cx, expr, recv, n_arg),
+ },
+ ("ok_or_else", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "ok_or"),
+ ("or_else", [arg]) => {
+ if !bind_instead_of_map::ResultOrElseErrInfo::check(cx, expr, recv, arg) {
+ unnecessary_lazy_eval::check(cx, expr, recv, arg, "or");
+ }
+ },
+ ("splitn" | "rsplitn", [count_arg, pat_arg]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ if count == 2 && meets_msrv(msrv, &msrvs::STR_SPLIT_ONCE) {
+ str_splitn::check_manual_split_once(cx, name, expr, recv, pat_arg);
+ }
+ if count >= 2 {
+ str_splitn::check_needless_splitn(cx, name, expr, recv, pat_arg, count);
+ }
+ }
+ },
+ ("splitn_mut" | "rsplitn_mut", [count_arg, _]) => {
+ if let Some((Constant::Int(count), _)) = constant(cx, cx.typeck_results(), count_arg) {
+ suspicious_splitn::check(cx, name, expr, recv, count);
+ }
+ },
+ ("step_by", [arg]) => iterator_step_by_zero::check(cx, expr, arg),
+ ("take", args @ [_arg]) => {
+ if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
+ if let ("cloned", []) = (name2, args2) {
+ iter_overeager_cloned::check(cx, expr, recv2, name, args);
+ }
+ }
+ },
+ ("to_os_string" | "to_owned" | "to_path_buf" | "to_vec", []) => {
+ implicit_clone::check(cx, name, expr, recv);
+ },
+ ("unwrap", []) => match method_call(recv) {
+ Some(("get", [recv, get_arg], _)) => get_unwrap::check(cx, expr, recv, get_arg, false),
+ Some(("get_mut", [recv, get_arg], _)) => get_unwrap::check(cx, expr, recv, get_arg, true),
+ _ => unwrap_used::check(cx, expr, recv),
+ },
+ ("unwrap_or", [u_arg]) => match method_call(recv) {
+ Some((arith @ ("checked_add" | "checked_sub" | "checked_mul"), [lhs, rhs], _)) => {
+ manual_saturating_arithmetic::check(cx, expr, lhs, rhs, u_arg, &arith["checked_".len()..]);
+ },
+ Some(("map", [m_recv, m_arg], span)) => {
+ option_map_unwrap_or::check(cx, expr, m_recv, m_arg, recv, u_arg, span);
+ },
+ _ => {},
+ },
+ ("unwrap_or_else", [u_arg]) => match method_call(recv) {
+ Some(("map", [recv, map_arg], _)) if map_unwrap_or::check(cx, expr, recv, map_arg, u_arg, msrv) => {},
+ _ => {
+ unwrap_or_else_default::check(cx, expr, recv, u_arg);
+ unnecessary_lazy_eval::check(cx, expr, recv, u_arg, "unwrap_or");
+ },
+ },
+ _ => {},
+ }
+ }
+}
+
+fn check_is_some_is_none(cx: &LateContext<'_>, expr: &Expr<'_>, recv: &Expr<'_>, is_some: bool) {
+ if let Some((name @ ("find" | "position" | "rposition"), [f_recv, arg], span)) = method_call(recv) {
+ search_is_some::check(cx, expr, name, is_some, f_recv, arg, recv, span);
+ }
+}
+
+/// Used for `lint_binary_expr_with_method_call`.
+#[derive(Copy, Clone)]
+struct BinaryExprInfo<'a> {
+ expr: &'a hir::Expr<'a>,
+ chain: &'a hir::Expr<'a>,
+ other: &'a hir::Expr<'a>,
+ eq: bool,
+}
+
+/// Checks for the `CHARS_NEXT_CMP` and `CHARS_LAST_CMP` lints.
+fn lint_binary_expr_with_method_call(cx: &LateContext<'_>, info: &mut BinaryExprInfo<'_>) {
+ macro_rules! lint_with_both_lhs_and_rhs {
+ ($func:expr, $cx:expr, $info:ident) => {
+ if !$func($cx, $info) {
+ ::std::mem::swap(&mut $info.chain, &mut $info.other);
+ if $func($cx, $info) {
+ return;
+ }
+ }
+ };
+ }
+
+ lint_with_both_lhs_and_rhs!(chars_next_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_next_cmp_with_unwrap::check, cx, info);
+ lint_with_both_lhs_and_rhs!(chars_last_cmp_with_unwrap::check, cx, info);
+}
+
+const FN_HEADER: hir::FnHeader = hir::FnHeader {
+ unsafety: hir::Unsafety::Normal,
+ constness: hir::Constness::NotConst,
+ asyncness: hir::IsAsync::NotAsync,
+ abi: rustc_target::spec::abi::Abi::Rust,
+};
+
+struct ShouldImplTraitCase {
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ // implicit self kind expected (none, self, &self, ...)
+ self_kind: SelfKind,
+ // checks against the output type
+ output_type: OutType,
+ // certain methods with explicit lifetimes can't implement the equivalent trait method
+ lint_explicit_lifetime: bool,
+}
+impl ShouldImplTraitCase {
+ const fn new(
+ trait_name: &'static str,
+ method_name: &'static str,
+ param_count: usize,
+ fn_header: hir::FnHeader,
+ self_kind: SelfKind,
+ output_type: OutType,
+ lint_explicit_lifetime: bool,
+ ) -> ShouldImplTraitCase {
+ ShouldImplTraitCase {
+ trait_name,
+ method_name,
+ param_count,
+ fn_header,
+ self_kind,
+ output_type,
+ lint_explicit_lifetime,
+ }
+ }
+
+ fn lifetime_param_cond(&self, impl_item: &hir::ImplItem<'_>) -> bool {
+ self.lint_explicit_lifetime
+ || !impl_item.generics.params.iter().any(|p| {
+ matches!(
+ p.kind,
+ hir::GenericParamKind::Lifetime {
+ kind: hir::LifetimeParamKind::Explicit
+ }
+ )
+ })
+ }
+}
+
+#[rustfmt::skip]
+const TRAIT_METHODS: [ShouldImplTraitCase; 30] = [
+ ShouldImplTraitCase::new("std::ops::Add", "add", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::convert::AsMut", "as_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::convert::AsRef", "as_ref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::BitAnd", "bitand", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitOr", "bitor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::BitXor", "bitxor", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::borrow::Borrow", "borrow", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::borrow::BorrowMut", "borrow_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::clone::Clone", "clone", 1, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ ShouldImplTraitCase::new("std::cmp::Ord", "cmp", 2, FN_HEADER, SelfKind::Ref, OutType::Any, true),
+ // FIXME: default doesn't work
+ ShouldImplTraitCase::new("std::default::Default", "default", 0, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Deref", "deref", 1, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::DerefMut", "deref_mut", 1, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::Div", "div", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Drop", "drop", 1, FN_HEADER, SelfKind::RefMut, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::cmp::PartialEq", "eq", 2, FN_HEADER, SelfKind::Ref, OutType::Bool, true),
+ ShouldImplTraitCase::new("std::iter::FromIterator", "from_iter", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::str::FromStr", "from_str", 1, FN_HEADER, SelfKind::No, OutType::Any, true),
+ ShouldImplTraitCase::new("std::hash::Hash", "hash", 2, FN_HEADER, SelfKind::Ref, OutType::Unit, true),
+ ShouldImplTraitCase::new("std::ops::Index", "index", 2, FN_HEADER, SelfKind::Ref, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::ops::IndexMut", "index_mut", 2, FN_HEADER, SelfKind::RefMut, OutType::Ref, true),
+ ShouldImplTraitCase::new("std::iter::IntoIterator", "into_iter", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Mul", "mul", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Neg", "neg", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::iter::Iterator", "next", 1, FN_HEADER, SelfKind::RefMut, OutType::Any, false),
+ ShouldImplTraitCase::new("std::ops::Not", "not", 1, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Rem", "rem", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shl", "shl", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Shr", "shr", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+ ShouldImplTraitCase::new("std::ops::Sub", "sub", 2, FN_HEADER, SelfKind::Value, OutType::Any, true),
+];
+
+#[derive(Clone, Copy, PartialEq, Debug)]
+enum SelfKind {
+ Value,
+ Ref,
+ RefMut,
+ No,
+}
+
+impl SelfKind {
+ fn matches<'a>(self, cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ fn matches_value<'a>(cx: &LateContext<'a>, parent_ty: Ty<'_>, ty: Ty<'_>) -> bool {
+ if ty == parent_ty {
+ true
+ } else if ty.is_box() {
+ ty.boxed_ty() == parent_ty
+ } else if is_type_diagnostic_item(cx, ty, sym::Rc) || is_type_diagnostic_item(cx, ty, sym::Arc) {
+ if let ty::Adt(_, substs) = ty.kind() {
+ substs.types().next().map_or(false, |t| t == parent_ty)
+ } else {
+ false
+ }
+ } else {
+ false
+ }
+ }
+
+ fn matches_ref<'a>(cx: &LateContext<'a>, mutability: hir::Mutability, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ if let ty::Ref(_, t, m) = *ty.kind() {
+ return m == mutability && t == parent_ty;
+ }
+
+ let trait_path = match mutability {
+ hir::Mutability::Not => &paths::ASREF_TRAIT,
+ hir::Mutability::Mut => &paths::ASMUT_TRAIT,
+ };
+
+ let trait_def_id = match get_trait_def_id(cx, trait_path) {
+ Some(did) => did,
+ None => return false,
+ };
+ implements_trait(cx, ty, trait_def_id, &[parent_ty.into()])
+ }
+
+ fn matches_none<'a>(cx: &LateContext<'a>, parent_ty: Ty<'a>, ty: Ty<'a>) -> bool {
+ !matches_value(cx, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Not, parent_ty, ty)
+ && !matches_ref(cx, hir::Mutability::Mut, parent_ty, ty)
+ }
+
+ match self {
+ Self::Value => matches_value(cx, parent_ty, ty),
+ Self::Ref => matches_ref(cx, hir::Mutability::Not, parent_ty, ty) || ty == parent_ty && is_copy(cx, ty),
+ Self::RefMut => matches_ref(cx, hir::Mutability::Mut, parent_ty, ty),
+ Self::No => matches_none(cx, parent_ty, ty),
+ }
+ }
+
+ #[must_use]
+ fn description(self) -> &'static str {
+ match self {
+ Self::Value => "`self` by value",
+ Self::Ref => "`self` by reference",
+ Self::RefMut => "`self` by mutable reference",
+ Self::No => "no `self`",
+ }
+ }
+}
+
+#[derive(Clone, Copy)]
+enum OutType {
+ Unit,
+ Bool,
+ Any,
+ Ref,
+}
+
+impl OutType {
+ fn matches(self, ty: &hir::FnRetTy<'_>) -> bool {
+ let is_unit = |ty: &hir::Ty<'_>| matches!(ty.kind, hir::TyKind::Tup(&[]));
+ match (self, ty) {
+ (Self::Unit, &hir::FnRetTy::DefaultReturn(_)) => true,
+ (Self::Unit, &hir::FnRetTy::Return(ty)) if is_unit(ty) => true,
+ (Self::Bool, &hir::FnRetTy::Return(ty)) if is_bool(ty) => true,
+ (Self::Any, &hir::FnRetTy::Return(ty)) if !is_unit(ty) => true,
+ (Self::Ref, &hir::FnRetTy::Return(ty)) => matches!(ty.kind, hir::TyKind::Rptr(_, _)),
+ _ => false,
+ }
+ }
+}
+
+fn is_bool(ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ matches!(path.res, Res::PrimTy(PrimTy::Bool))
+ } else {
+ false
+ }
+}
+
+fn fn_header_equals(expected: hir::FnHeader, actual: hir::FnHeader) -> bool {
+ expected.constness == actual.constness
+ && expected.unsafety == actual.unsafety
+ && expected.asyncness == actual.asyncness
+}
--- /dev/null
- use rustc_hir::{Body, Expr, ExprKind, LangItem, MatchSource, QPath};
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_lang_ctor;
+use clippy_utils::source::snippet;
+use if_chain::if_chain;
+use rustc_errors::Applicability;
+use rustc_hir::LangItem::{OptionSome, ResultOk};
- check(cx, body.value.peel_blocks());
++use rustc_hir::{AsyncGeneratorKind, Block, Body, Expr, ExprKind, GeneratorKind, LangItem, MatchSource, QPath};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty::TyS;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Suggests alternatives for useless applications of `?` in terminating expressions
+ ///
+ /// ### Why is this bad?
+ /// There's no reason to use `?` to short-circuit when execution of the body will end there anyway.
+ ///
+ /// ### Example
+ /// ```rust
+ /// struct TO {
+ /// magic: Option<usize>,
+ /// }
+ ///
+ /// fn f(to: TO) -> Option<usize> {
+ /// Some(to.magic?)
+ /// }
+ ///
+ /// struct TR {
+ /// magic: Result<usize, bool>,
+ /// }
+ ///
+ /// fn g(tr: Result<TR, bool>) -> Result<usize, bool> {
+ /// tr.and_then(|t| Ok(t.magic?))
+ /// }
+ ///
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// struct TO {
+ /// magic: Option<usize>,
+ /// }
+ ///
+ /// fn f(to: TO) -> Option<usize> {
+ /// to.magic
+ /// }
+ ///
+ /// struct TR {
+ /// magic: Result<usize, bool>,
+ /// }
+ ///
+ /// fn g(tr: Result<TR, bool>) -> Result<usize, bool> {
+ /// tr.and_then(|t| t.magic)
+ /// }
+ /// ```
+ #[clippy::version = "1.51.0"]
+ pub NEEDLESS_QUESTION_MARK,
+ complexity,
+ "Suggest `value.inner_option` instead of `Some(value.inner_option?)`. The same goes for `Result<T, E>`."
+}
+
+declare_lint_pass!(NeedlessQuestionMark => [NEEDLESS_QUESTION_MARK]);
+
+impl LateLintPass<'_> for NeedlessQuestionMark {
+ /*
+ * The question mark operator is compatible with both Result<T, E> and Option<T>,
+ * from Rust 1.13 and 1.22 respectively.
+ */
+
+ /*
+ * What do we match:
+ * Expressions that look like this:
+ * Some(option?), Ok(result?)
+ *
+ * Where do we match:
+ * Last expression of a body
+ * Return statement
+ * A body's value (single line closure)
+ *
+ * What do we not match:
+ * Implicit calls to `from(..)` on the error value
+ */
+
+ fn check_expr(&mut self, cx: &LateContext<'_>, expr: &'_ Expr<'_>) {
+ if let ExprKind::Ret(Some(e)) = expr.kind {
+ check(cx, e);
+ }
+ }
+
+ fn check_body(&mut self, cx: &LateContext<'_>, body: &'_ Body<'_>) {
++ if let Some(GeneratorKind::Async(AsyncGeneratorKind::Fn)) = body.generator_kind {
++ if let ExprKind::Block(
++ Block {
++ expr:
++ Some(Expr {
++ kind: ExprKind::DropTemps(async_body),
++ ..
++ }),
++ ..
++ },
++ _,
++ ) = body.value.kind
++ {
++ if let ExprKind::Block(Block { expr: Some(expr), .. }, ..) = async_body.kind {
++ check(cx, expr);
++ }
++ }
++ } else {
++ check(cx, body.value.peel_blocks());
++ }
+ }
+}
+
+fn check(cx: &LateContext<'_>, expr: &Expr<'_>) {
+ if_chain! {
+ if let ExprKind::Call(path, [arg]) = &expr.kind;
+ if let ExprKind::Path(ref qpath) = &path.kind;
+ let sugg_remove = if is_lang_ctor(cx, qpath, OptionSome) {
+ "Some()"
+ } else if is_lang_ctor(cx, qpath, ResultOk) {
+ "Ok()"
+ } else {
+ return;
+ };
+ if let ExprKind::Match(inner_expr_with_q, _, MatchSource::TryDesugar) = &arg.kind;
+ if let ExprKind::Call(called, [inner_expr]) = &inner_expr_with_q.kind;
+ if let ExprKind::Path(QPath::LangItem(LangItem::TryTraitBranch, ..)) = &called.kind;
+ if expr.span.ctxt() == inner_expr.span.ctxt();
+ let expr_ty = cx.typeck_results().expr_ty(expr);
+ let inner_ty = cx.typeck_results().expr_ty(inner_expr);
+ if TyS::same_type(expr_ty, inner_ty);
+ then {
+ span_lint_and_sugg(
+ cx,
+ NEEDLESS_QUESTION_MARK,
+ expr.span,
+ "question mark operator is useless here",
+ &format!("try removing question mark and `{}`", sugg_remove),
+ format!("{}", snippet(cx, inner_expr.span, r#""...""#)),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+}
--- /dev/null
- write!(&mut suggest_1, "\\x{:02x}", n).unwrap();
+use clippy_utils::diagnostics::span_lint_and_then;
+use rustc_ast::ast::{Expr, ExprKind};
+use rustc_ast::token::{Lit, LitKind};
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::Span;
+use std::fmt::Write;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for `\0` escapes in string and byte literals that look like octal
+ /// character escapes in C.
+ ///
+ /// ### Why is this bad?
+ ///
+ /// C and other languages support octal character escapes in strings, where
+ /// a backslash is followed by up to three octal digits. For example, `\033`
+ /// stands for the ASCII character 27 (ESC). Rust does not support this
+ /// notation, but has the escape code `\0` which stands for a null
+ /// byte/character, and any following digits do not form part of the escape
+ /// sequence. Therefore, `\033` is not a compiler error but the result may
+ /// be surprising.
+ ///
+ /// ### Known problems
+ /// The actual meaning can be the intended one. `\x00` can be used in these
+ /// cases to be unambigious.
+ ///
+ /// The lint does not trigger for format strings in `print!()`, `write!()`
+ /// and friends since the string is already preprocessed when Clippy lints
+ /// can see it.
+ ///
+ /// # Example
+ /// ```rust
+ /// // Bad
+ /// let one = "\033[1m Bold? \033[0m"; // \033 intended as escape
+ /// let two = "\033\0"; // \033 intended as null-3-3
+ ///
+ /// // Good
+ /// let one = "\x1b[1mWill this be bold?\x1b[0m";
+ /// let two = "\x0033\x00";
+ /// ```
+ #[clippy::version = "1.58.0"]
+ pub OCTAL_ESCAPES,
+ suspicious,
+ "string escape sequences looking like octal characters"
+}
+
+declare_lint_pass!(OctalEscapes => [OCTAL_ESCAPES]);
+
+impl EarlyLintPass for OctalEscapes {
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, expr: &Expr) {
+ if in_external_macro(cx.sess(), expr.span) {
+ return;
+ }
+
+ if let ExprKind::Lit(lit) = &expr.kind {
+ if matches!(lit.token.kind, LitKind::Str) {
+ check_lit(cx, &lit.token, lit.span, true);
+ } else if matches!(lit.token.kind, LitKind::ByteStr) {
+ check_lit(cx, &lit.token, lit.span, false);
+ }
+ }
+ }
+}
+
+fn check_lit(cx: &EarlyContext<'_>, lit: &Lit, span: Span, is_string: bool) {
+ let contents = lit.symbol.as_str();
+ let mut iter = contents.char_indices().peekable();
+ let mut found = vec![];
+
+ // go through the string, looking for \0[0-7][0-7]?
+ while let Some((from, ch)) = iter.next() {
+ if ch == '\\' {
+ if let Some((_, '0')) = iter.next() {
+ // collect up to two further octal digits
+ if let Some((mut to, '0'..='7')) = iter.next() {
+ if let Some((_, '0'..='7')) = iter.peek() {
+ to += 1;
+ }
+ found.push((from, to + 1));
+ }
+ }
+ }
+ }
+
+ if found.is_empty() {
+ return;
+ }
+
+ // construct two suggestion strings, one with \x escapes with octal meaning
+ // as in C, and one with \x00 for null bytes.
+ let mut suggest_1 = if is_string { "\"" } else { "b\"" }.to_string();
+ let mut suggest_2 = suggest_1.clone();
+ let mut index = 0;
+ for (from, to) in found {
+ suggest_1.push_str(&contents[index..from]);
+ suggest_2.push_str(&contents[index..from]);
+
+ // construct a replacement escape
+ // the maximum value is \077, or \x3f, so u8 is sufficient here
+ if let Ok(n) = u8::from_str_radix(&contents[from + 1..to], 8) {
++ write!(suggest_1, "\\x{:02x}", n).unwrap();
+ }
+
+ // append the null byte as \x00 and the following digits literally
+ suggest_2.push_str("\\x00");
+ suggest_2.push_str(&contents[from + 2..to]);
+
+ index = to;
+ }
+ suggest_1.push_str(&contents[index..]);
+ suggest_1.push('"');
+ suggest_2.push_str(&contents[index..]);
+ suggest_2.push('"');
+
+ span_lint_and_then(
+ cx,
+ OCTAL_ESCAPES,
+ span,
+ &format!(
+ "octal-looking escape in {} literal",
+ if is_string { "string" } else { "byte string" }
+ ),
+ |diag| {
+ diag.help(&format!(
+ "octal escapes are not supported, `\\0` is always a null {}",
+ if is_string { "character" } else { "byte" }
+ ));
+ // suggestion 1: equivalent hex escape
+ diag.span_suggestion(
+ span,
+ "if an octal escape was intended, use the hexadecimal representation instead",
+ suggest_1,
+ Applicability::MaybeIncorrect,
+ );
+ // suggestion 2: unambiguous null byte
+ diag.span_suggestion(
+ span,
+ &format!(
+ "if the null {} is intended, disambiguate using",
+ if is_string { "character" } else { "byte" }
+ ),
+ suggest_2,
+ Applicability::MaybeIncorrect,
+ );
+ },
+ );
+}
--- /dev/null
- use clippy_utils::ptr::get_spans;
+//! Checks for usage of `&Vec[_]` and `&String`.
+
+use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then};
- use clippy_utils::ty::walk_ptrs_hir_ty;
- use clippy_utils::{expr_path_res, is_lint_allowed, match_any_diagnostic_items, paths};
+use clippy_utils::source::snippet_opt;
- use rustc_hir::def::Res;
++use clippy_utils::ty::expr_sig;
++use clippy_utils::{
++ expr_path_res, get_expr_use_or_unification_node, is_lint_allowed, match_any_diagnostic_items, path_to_local, paths,
++};
+use if_chain::if_chain;
+use rustc_errors::Applicability;
- BinOpKind, BodyId, Expr, ExprKind, FnDecl, FnRetTy, GenericArg, Impl, ImplItem, ImplItemKind, Item, ItemKind,
- Lifetime, MutTy, Mutability, Node, PathSegment, QPath, TraitFn, TraitItem, TraitItemKind, Ty, TyKind,
++use rustc_hir::def_id::DefId;
++use rustc_hir::hir_id::HirIdMap;
++use rustc_hir::intravisit::{walk_expr, Visitor};
+use rustc_hir::{
- use std::borrow::Cow;
++ self as hir, AnonConst, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnDecl, FnRetTy, GenericArg,
++ ImplItemKind, ItemKind, Lifetime, LifetimeName, Mutability, Node, Param, ParamName, PatKind, QPath, TraitFn,
++ TraitItem, TraitItemKind, TyKind,
+};
+use rustc_lint::{LateContext, LateLintPass};
++use rustc_middle::hir::nested_filter;
++use rustc_middle::ty::{self, AssocItems, AssocKind, Ty};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::source_map::Span;
+use rustc_span::symbol::Symbol;
+use rustc_span::{sym, MultiSpan};
- /// This lint checks for function arguments of type `&String`
- /// or `&Vec` unless the references are mutable. It will also suggest you
- /// replace `.clone()` calls with the appropriate `.to_owned()`/`to_string()`
- /// calls.
++use std::fmt;
++use std::iter;
+
+declare_clippy_lint! {
+ /// ### What it does
- /// The lint does not follow data. So if you have an
- /// argument `x` and write `let y = x; y.clone()` the lint will not suggest
- /// changing that `.clone()` to `.to_owned()`.
- ///
- /// Other functions called from this function taking a `&String` or `&Vec`
- /// argument may also fail to compile if you change the argument. Applying
- /// this lint on them will fix the problem, but they may be in other crates.
- ///
- /// One notable example of a function that may cause issues, and which cannot
- /// easily be changed due to being in the standard library is `Vec::contains`.
- /// when called on a `Vec<Vec<T>>`. If a `&Vec` is passed to that method then
- /// it will compile, but if a `&[T]` is passed then it will not compile.
- ///
- /// ```ignore
- /// fn cannot_take_a_slice(v: &Vec<u8>) -> bool {
- /// let vec_of_vecs: Vec<Vec<u8>> = some_other_fn();
- ///
- /// vec_of_vecs.contains(v)
- /// }
- /// ```
- ///
- /// Also there may be `fn(&Vec)`-typed references pointing to your function.
++ /// This lint checks for function arguments of type `&String`, `&Vec`,
++ /// `&PathBuf`, and `Cow<_>`. It will also suggest you replace `.clone()` calls
++ /// with the appropriate `.to_owned()`/`to_string()` calls.
+ ///
+ /// ### Why is this bad?
+ /// Requiring the argument to be of the specific size
+ /// makes the function less useful for no benefit; slices in the form of `&[T]`
+ /// or `&str` usually suffice and can be obtained from other types, too.
+ ///
+ /// ### Known problems
- fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
- if let ItemKind::Fn(ref sig, _, body_id) = item.kind {
- check_fn(cx, sig.decl, Some(body_id));
- }
- }
++ /// There may be `fn(&Vec)`-typed references pointing to your function.
+ /// If you have them, you will get a compiler error after applying this lint's
+ /// suggestions. You then have the choice to undo your changes or change the
+ /// type of the reference.
+ ///
+ /// Note that if the function is part of your public interface, there may be
+ /// other crates referencing it, of which you may not be aware. Carefully
+ /// deprecate the function before applying the lint suggestions in this case.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // Bad
+ /// fn foo(&Vec<u32>) { .. }
+ ///
+ /// // Good
+ /// fn foo(&[u32]) { .. }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub PTR_ARG,
+ style,
+ "fn arguments of the type `&Vec<...>` or `&String`, suggesting to use `&[...]` or `&str` instead, respectively"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for equality comparisons with `ptr::null`
+ ///
+ /// ### Why is this bad?
+ /// It's easier and more readable to use the inherent
+ /// `.is_null()`
+ /// method instead
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // Bad
+ /// if x == ptr::null {
+ /// ..
+ /// }
+ ///
+ /// // Good
+ /// if x.is_null() {
+ /// ..
+ /// }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub CMP_NULL,
+ style,
+ "comparing a pointer to a null pointer, suggesting to use `.is_null()` instead"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for functions that take immutable
+ /// references and return mutable ones.
+ ///
+ /// ### Why is this bad?
+ /// This is trivially unsound, as one can create two
+ /// mutable references from the same (immutable!) source.
+ /// This [error](https://github.com/rust-lang/rust/issues/39465)
+ /// actually lead to an interim Rust release 1.15.1.
+ ///
+ /// ### Known problems
+ /// To be on the conservative side, if there's at least one
+ /// mutable reference with the output lifetime, this lint will not trigger.
+ /// In practice, this case is unlikely anyway.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// fn foo(&Foo) -> &mut Bar { .. }
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub MUT_FROM_REF,
+ correctness,
+ "fns that create mutable refs from immutable ref args"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint checks for invalid usages of `ptr::null`.
+ ///
+ /// ### Why is this bad?
+ /// This causes undefined behavior.
+ ///
+ /// ### Example
+ /// ```ignore
+ /// // Bad. Undefined behavior
+ /// unsafe { std::slice::from_raw_parts(ptr::null(), 0); }
+ /// ```
+ ///
+ /// ```ignore
+ /// // Good
+ /// unsafe { std::slice::from_raw_parts(NonNull::dangling().as_ptr(), 0); }
+ /// ```
+ #[clippy::version = "1.53.0"]
+ pub INVALID_NULL_PTR_USAGE,
+ correctness,
+ "invalid usage of a null pointer, suggesting `NonNull::dangling()` instead"
+}
+
+declare_lint_pass!(Ptr => [PTR_ARG, CMP_NULL, MUT_FROM_REF, INVALID_NULL_PTR_USAGE]);
+
+impl<'tcx> LateLintPass<'tcx> for Ptr {
- fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
- if let ImplItemKind::Fn(ref sig, body_id) = item.kind {
- let parent_item = cx.tcx.hir().get_parent_item(item.hir_id());
- if let Some(Node::Item(it)) = cx.tcx.hir().find_by_def_id(parent_item) {
- if let ItemKind::Impl(Impl { of_trait: Some(_), .. }) = it.kind {
- return; // ignore trait impls
- }
++ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
++ if let TraitItemKind::Fn(sig, trait_method) = &item.kind {
++ if matches!(trait_method, TraitFn::Provided(_)) {
++ // Handled by check body.
++ return;
++ }
+
- check_fn(cx, sig.decl, Some(body_id));
++ check_mut_from_ref(cx, sig.decl);
++ for arg in check_fn_args(
++ cx,
++ cx.tcx.fn_sig(item.def_id).skip_binder().inputs(),
++ sig.decl.inputs,
++ &[],
++ ) {
++ span_lint_and_sugg(
++ cx,
++ PTR_ARG,
++ arg.span,
++ &arg.build_msg(),
++ "change this to",
++ format!("{}{}", arg.ref_prefix, arg.deref_ty.display(cx)),
++ Applicability::Unspecified,
++ );
+ }
- fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
- if let TraitItemKind::Fn(ref sig, ref trait_method) = item.kind {
- let body_id = if let TraitFn::Provided(b) = *trait_method {
- Some(b)
- } else {
- None
- };
- check_fn(cx, sig.decl, body_id);
+ }
+ }
+
- #[allow(clippy::too_many_lines)]
- fn check_fn(cx: &LateContext<'_>, decl: &FnDecl<'_>, opt_body_id: Option<BodyId>) {
- let body = opt_body_id.map(|id| cx.tcx.hir().body(id));
-
- for (idx, arg) in decl.inputs.iter().enumerate() {
- // Honor the allow attribute on parameters. See issue 5644.
- if let Some(body) = &body {
- if is_lint_allowed(cx, PTR_ARG, body.params[idx].hir_id) {
- continue;
- }
- }
++ fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
++ let hir = cx.tcx.hir();
++ let mut parents = hir.parent_iter(body.value.hir_id);
++ let (item_id, decl) = match parents.next() {
++ Some((_, Node::Item(i))) => {
++ if let ItemKind::Fn(sig, ..) = &i.kind {
++ (i.def_id, sig.decl)
++ } else {
++ return;
++ }
++ },
++ Some((_, Node::ImplItem(i))) => {
++ if !matches!(parents.next(),
++ Some((_, Node::Item(i))) if matches!(&i.kind, ItemKind::Impl(i) if i.of_trait.is_none())
++ ) {
++ return;
++ }
++ if let ImplItemKind::Fn(sig, _) = &i.kind {
++ (i.def_id, sig.decl)
++ } else {
++ return;
++ }
++ },
++ Some((_, Node::TraitItem(i))) => {
++ if let TraitItemKind::Fn(sig, _) = &i.kind {
++ (i.def_id, sig.decl)
++ } else {
++ return;
++ }
++ },
++ _ => return,
++ };
++
++ check_mut_from_ref(cx, decl);
++ let sig = cx.tcx.fn_sig(item_id).skip_binder();
++ let lint_args: Vec<_> = check_fn_args(cx, sig.inputs(), decl.inputs, body.params).collect();
++ let results = check_ptr_arg_usage(cx, body, &lint_args);
++
++ for (result, args) in results.iter().zip(lint_args.iter()).filter(|(r, _)| !r.skip) {
++ span_lint_and_then(cx, PTR_ARG, args.span, &args.build_msg(), |diag| {
++ diag.multipart_suggestion(
++ "change this to",
++ iter::once((args.span, format!("{}{}", args.ref_prefix, args.deref_ty.display(cx))))
++ .chain(result.replacements.iter().map(|r| {
++ (
++ r.expr_span,
++ format!("{}{}", snippet_opt(cx, r.self_span).unwrap(), r.replacement),
++ )
++ }))
++ .collect(),
++ Applicability::Unspecified,
++ );
++ });
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if let ExprKind::Binary(ref op, l, r) = expr.kind {
+ if (op.node == BinOpKind::Eq || op.node == BinOpKind::Ne) && (is_null_path(cx, l) || is_null_path(cx, r)) {
+ span_lint(
+ cx,
+ CMP_NULL,
+ expr.span,
+ "comparing with null is better expressed by the `.is_null()` method",
+ );
+ }
+ } else {
+ check_invalid_ptr_usage(cx, expr);
+ }
+ }
+}
+
+fn check_invalid_ptr_usage<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ // (fn_path, arg_indices) - `arg_indices` are the `arg` positions where null would cause U.B.
+ const INVALID_NULL_PTR_USAGE_TABLE: [(&[&str], &[usize]); 16] = [
+ (&paths::SLICE_FROM_RAW_PARTS, &[0]),
+ (&paths::SLICE_FROM_RAW_PARTS_MUT, &[0]),
+ (&paths::PTR_COPY, &[0, 1]),
+ (&paths::PTR_COPY_NONOVERLAPPING, &[0, 1]),
+ (&paths::PTR_READ, &[0]),
+ (&paths::PTR_READ_UNALIGNED, &[0]),
+ (&paths::PTR_READ_VOLATILE, &[0]),
+ (&paths::PTR_REPLACE, &[0]),
+ (&paths::PTR_SLICE_FROM_RAW_PARTS, &[0]),
+ (&paths::PTR_SLICE_FROM_RAW_PARTS_MUT, &[0]),
+ (&paths::PTR_SWAP, &[0, 1]),
+ (&paths::PTR_SWAP_NONOVERLAPPING, &[0, 1]),
+ (&paths::PTR_WRITE, &[0]),
+ (&paths::PTR_WRITE_UNALIGNED, &[0]),
+ (&paths::PTR_WRITE_VOLATILE, &[0]),
+ (&paths::PTR_WRITE_BYTES, &[0]),
+ ];
+
+ if_chain! {
+ if let ExprKind::Call(fun, args) = expr.kind;
+ if let ExprKind::Path(ref qpath) = fun.kind;
+ if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
+ let fun_def_path = cx.get_def_path(fun_def_id).into_iter().map(Symbol::to_ident_string).collect::<Vec<_>>();
+ if let Some(&(_, arg_indices)) = INVALID_NULL_PTR_USAGE_TABLE
+ .iter()
+ .find(|&&(fn_path, _)| fn_path == fun_def_path);
+ then {
+ for &arg_idx in arg_indices {
+ if let Some(arg) = args.get(arg_idx).filter(|arg| is_null_path(cx, arg)) {
+ span_lint_and_sugg(
+ cx,
+ INVALID_NULL_PTR_USAGE,
+ arg.span,
+ "pointer must be non-null",
+ "change this to",
+ "core::ptr::NonNull::dangling().as_ptr()".to_string(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+ }
+}
+
- let (item_name, path) = if_chain! {
- if let TyKind::Rptr(_, MutTy { ty, mutbl: Mutability::Not }) = arg.kind;
- if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind;
- if let Res::Def(_, did) = path.res;
- if let Some(item_name) = cx.tcx.get_diagnostic_name(did);
- then {
- (item_name, path)
- } else {
- continue
- }
- };
++#[derive(Default)]
++struct PtrArgResult {
++ skip: bool,
++ replacements: Vec<PtrArgReplacement>,
++}
+
- match item_name {
- sym::Vec => {
- if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_owned()")]) {
- span_lint_and_then(
- cx,
- PTR_ARG,
- arg.span,
- "writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used \
- with non-Vec-based slices",
- |diag| {
- if let Some(ref snippet) = get_only_generic_arg_snippet(cx, arg) {
- diag.span_suggestion(
- arg.span,
- "change this to",
- format!("&[{}]", snippet),
- Applicability::Unspecified,
- );
- }
- for (clonespan, suggestion) in spans {
- diag.span_suggestion(
- clonespan,
- &snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
- Cow::Owned(format!("change `{}` to", x))
- }),
- suggestion.into(),
- Applicability::Unspecified,
- );
- }
- },
- );
- }
++struct PtrArgReplacement {
++ expr_span: Span,
++ self_span: Span,
++ replacement: &'static str,
++}
+
- sym::String => {
- if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_string()"), ("as_str", "")]) {
- span_lint_and_then(
- cx,
- PTR_ARG,
- arg.span,
- "writing `&String` instead of `&str` involves a new object where a slice will do",
- |diag| {
- diag.span_suggestion(arg.span, "change this to", "&str".into(), Applicability::Unspecified);
- for (clonespan, suggestion) in spans {
- diag.span_suggestion_short(
- clonespan,
- &snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
- Cow::Owned(format!("change `{}` to", x))
- }),
- suggestion.into(),
- Applicability::Unspecified,
- );
- }
- },
- );
++struct PtrArg<'tcx> {
++ idx: usize,
++ span: Span,
++ ty_did: DefId,
++ ty_name: Symbol,
++ method_renames: &'static [(&'static str, &'static str)],
++ ref_prefix: RefPrefix,
++ deref_ty: DerefTy<'tcx>,
++ deref_assoc_items: Option<(DefId, &'tcx AssocItems<'tcx>)>,
++}
++impl PtrArg<'_> {
++ fn build_msg(&self) -> String {
++ format!(
++ "writing `&{}{}` instead of `&{}{}` involves a new object where a slice will do",
++ self.ref_prefix.mutability.prefix_str(),
++ self.ty_name,
++ self.ref_prefix.mutability.prefix_str(),
++ self.deref_ty.argless_str(),
++ )
++ }
++}
++
++struct RefPrefix {
++ lt: LifetimeName,
++ mutability: Mutability,
++}
++impl fmt::Display for RefPrefix {
++ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
++ use fmt::Write;
++ f.write_char('&')?;
++ match self.lt {
++ LifetimeName::Param(ParamName::Plain(name)) => {
++ name.fmt(f)?;
++ f.write_char(' ')?;
+ },
- sym::PathBuf => {
- if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_path_buf()"), ("as_path", "")]) {
- span_lint_and_then(
- cx,
- PTR_ARG,
- arg.span,
- "writing `&PathBuf` instead of `&Path` involves a new object where a slice will do",
- |diag| {
- diag.span_suggestion(
- arg.span,
++ LifetimeName::Underscore => f.write_str("'_ ")?,
++ LifetimeName::Static => f.write_str("'static ")?,
++ _ => (),
++ }
++ f.write_str(self.mutability.prefix_str())
++ }
++}
++
++struct DerefTyDisplay<'a, 'tcx>(&'a LateContext<'tcx>, &'a DerefTy<'tcx>);
++impl fmt::Display for DerefTyDisplay<'_, '_> {
++ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
++ use std::fmt::Write;
++ match self.1 {
++ DerefTy::Str => f.write_str("str"),
++ DerefTy::Path => f.write_str("Path"),
++ DerefTy::Slice(hir_ty, ty) => {
++ f.write_char('[')?;
++ match hir_ty.and_then(|s| snippet_opt(self.0, s)) {
++ Some(s) => f.write_str(&s)?,
++ None => ty.fmt(f)?,
+ }
++ f.write_char(']')
+ },
- "&Path".into(),
++ }
++ }
++}
++
++enum DerefTy<'tcx> {
++ Str,
++ Path,
++ Slice(Option<Span>, Ty<'tcx>),
++}
++impl<'tcx> DerefTy<'tcx> {
++ fn argless_str(&self) -> &'static str {
++ match *self {
++ Self::Str => "str",
++ Self::Path => "Path",
++ Self::Slice(..) => "[_]",
++ }
++ }
++
++ fn display<'a>(&'a self, cx: &'a LateContext<'tcx>) -> DerefTyDisplay<'a, 'tcx> {
++ DerefTyDisplay(cx, self)
++ }
++}
++
++fn check_fn_args<'cx, 'tcx: 'cx>(
++ cx: &'cx LateContext<'tcx>,
++ tys: &'tcx [Ty<'_>],
++ hir_tys: &'tcx [hir::Ty<'_>],
++ params: &'tcx [Param<'_>],
++) -> impl Iterator<Item = PtrArg<'tcx>> + 'cx {
++ tys.iter()
++ .zip(hir_tys.iter())
++ .enumerate()
++ .filter_map(|(i, (ty, hir_ty))| {
++ if_chain! {
++ if let ty::Ref(_, ty, mutability) = *ty.kind();
++ if let ty::Adt(adt, substs) = *ty.kind();
++
++ if let TyKind::Rptr(lt, ref ty) = hir_ty.kind;
++ if let TyKind::Path(QPath::Resolved(None, path)) = ty.ty.kind;
++
++ // Check that the name as typed matches the actual name of the type.
++ // e.g. `fn foo(_: &Foo)` shouldn't trigger the lint when `Foo` is an alias for `Vec`
++ if let [.., name] = path.segments;
++ if cx.tcx.item_name(adt.did) == name.ident.name;
++
++ if !is_lint_allowed(cx, PTR_ARG, hir_ty.hir_id);
++ if params.get(i).map_or(true, |p| !is_lint_allowed(cx, PTR_ARG, p.hir_id));
++
++ then {
++ let (method_renames, deref_ty, deref_impl_id) = match cx.tcx.get_diagnostic_name(adt.did) {
++ Some(sym::Vec) => (
++ [("clone", ".to_owned()")].as_slice(),
++ DerefTy::Slice(
++ name.args
++ .and_then(|args| args.args.first())
++ .and_then(|arg| if let GenericArg::Type(ty) = arg {
++ Some(ty.span)
++ } else {
++ None
++ }),
++ substs.type_at(0),
++ ),
++ cx.tcx.lang_items().slice_impl()
++ ),
++ Some(sym::String) => (
++ [("clone", ".to_owned()"), ("as_str", "")].as_slice(),
++ DerefTy::Str,
++ cx.tcx.lang_items().str_impl()
++ ),
++ Some(sym::PathBuf) => (
++ [("clone", ".to_path_buf()"), ("as_path", "")].as_slice(),
++ DerefTy::Path,
++ None,
++ ),
++ Some(sym::Cow) => {
++ let ty_name = name.args
++ .and_then(|args| {
++ args.args.iter().find_map(|a| match a {
++ GenericArg::Type(x) => Some(x),
++ _ => None,
++ })
++ })
++ .and_then(|arg| snippet_opt(cx, arg.span))
++ .unwrap_or_else(|| substs.type_at(1).to_string());
++ span_lint_and_sugg(
++ cx,
++ PTR_ARG,
++ hir_ty.span,
++ "using a reference to `Cow` is not recommended",
+ "change this to",
- for (clonespan, suggestion) in spans {
- diag.span_suggestion_short(
- clonespan,
- &snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
- Cow::Owned(format!("change `{}` to", x))
- }),
- suggestion.into(),
- Applicability::Unspecified,
- );
- }
++ format!("&{}{}", mutability.prefix_str(), ty_name),
+ Applicability::Unspecified,
+ );
- );
- }
- },
- sym::Cow => {
- if_chain! {
- if let [ref bx] = *path.segments;
- if let Some(params) = bx.args;
- if !params.parenthesized;
- if let Some(inner) = params.args.iter().find_map(|arg| match arg {
- GenericArg::Type(ty) => Some(ty),
- _ => None,
++ return None;
+ },
- let replacement = snippet_opt(cx, inner.span);
- if let Some(r) = replacement;
- then {
- span_lint_and_sugg(
- cx,
- PTR_ARG,
- arg.span,
- "using a reference to `Cow` is not recommended",
- "change this to",
- "&".to_owned() + &r,
- Applicability::Unspecified,
- );
- }
++ _ => return None,
++ };
++ return Some(PtrArg {
++ idx: i,
++ span: hir_ty.span,
++ ty_did: adt.did,
++ ty_name: name.ident.name,
++ method_renames,
++ ref_prefix: RefPrefix {
++ lt: lt.name,
++ mutability,
++ },
++ deref_ty,
++ deref_assoc_items: deref_impl_id.map(|id| (id, cx.tcx.associated_items(id))),
+ });
- },
- _ => {},
- }
- }
+ }
- for (_, ref mutbl, ref argspan) in decl
++ }
++ None
++ })
++}
+
++fn check_mut_from_ref(cx: &LateContext<'_>, decl: &FnDecl<'_>) {
+ if let FnRetTy::Return(ty) = decl.output {
+ if let Some((out, Mutability::Mut, _)) = get_rptr_lm(ty) {
+ let mut immutables = vec![];
- if *mutbl == Mutability::Mut {
++ for (_, mutbl, argspan) in decl
+ .inputs
+ .iter()
+ .filter_map(get_rptr_lm)
+ .filter(|&(lt, _, _)| lt.name == out.name)
+ {
- immutables.push(*argspan);
++ if mutbl == Mutability::Mut {
+ return;
+ }
- fn get_only_generic_arg_snippet(cx: &LateContext<'_>, arg: &Ty<'_>) -> Option<String> {
- if_chain! {
- if let TyKind::Path(QPath::Resolved(_, path)) = walk_ptrs_hir_ty(arg).kind;
- if let Some(&PathSegment{args: Some(parameters), ..}) = path.segments.last();
- let types: Vec<_> = parameters.args.iter().filter_map(|arg| match arg {
- GenericArg::Type(ty) => Some(ty),
- _ => None,
- }).collect();
- if types.len() == 1;
- then {
- snippet_opt(cx, types[0].span)
- } else {
- None
++ immutables.push(argspan);
+ }
+ if immutables.is_empty() {
+ return;
+ }
+ span_lint_and_then(
+ cx,
+ MUT_FROM_REF,
+ ty.span,
+ "mutable borrow from immutable input(s)",
+ |diag| {
+ let ms = MultiSpan::from_spans(immutables);
+ diag.span_note(ms, "immutable borrow here");
+ },
+ );
+ }
+ }
+}
+
- fn get_rptr_lm<'tcx>(ty: &'tcx Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
++#[allow(clippy::too_many_lines)]
++fn check_ptr_arg_usage<'tcx>(cx: &LateContext<'tcx>, body: &'tcx Body<'_>, args: &[PtrArg<'tcx>]) -> Vec<PtrArgResult> {
++ struct V<'cx, 'tcx> {
++ cx: &'cx LateContext<'tcx>,
++ /// Map from a local id to which argument it came from (index into `Self::args` and
++ /// `Self::results`)
++ bindings: HirIdMap<usize>,
++ /// The arguments being checked.
++ args: &'cx [PtrArg<'tcx>],
++ /// The results for each argument (len should match args.len)
++ results: Vec<PtrArgResult>,
++ /// The number of arguments which can't be linted. Used to return early.
++ skip_count: usize,
++ }
++ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
++ type NestedFilter = nested_filter::OnlyBodies;
++ fn nested_visit_map(&mut self) -> Self::Map {
++ self.cx.tcx.hir()
++ }
++
++ fn visit_anon_const(&mut self, _: &'tcx AnonConst) {}
++
++ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
++ if self.skip_count == self.args.len() {
++ return;
++ }
++
++ // Check if this is local we care about
++ let args_idx = match path_to_local(e).and_then(|id| self.bindings.get(&id)) {
++ Some(&i) => i,
++ None => return walk_expr(self, e),
++ };
++ let args = &self.args[args_idx];
++ let result = &mut self.results[args_idx];
++
++ // Helper function to handle early returns.
++ let mut set_skip_flag = || {
++ if result.skip {
++ self.skip_count += 1;
++ }
++ result.skip = true;
++ };
++
++ match get_expr_use_or_unification_node(self.cx.tcx, e) {
++ Some((Node::Stmt(_), _)) => (),
++ Some((Node::Local(l), _)) => {
++ // Only trace simple bindings. e.g `let x = y;`
++ if let PatKind::Binding(BindingAnnotation::Unannotated, id, _, None) = l.pat.kind {
++ self.bindings.insert(id, args_idx);
++ } else {
++ set_skip_flag();
++ }
++ },
++ Some((Node::Expr(e), child_id)) => match e.kind {
++ ExprKind::Call(f, expr_args) => {
++ let i = expr_args.iter().position(|arg| arg.hir_id == child_id).unwrap_or(0);
++ if expr_sig(self.cx, f)
++ .map(|sig| sig.input(i).skip_binder().peel_refs())
++ .map_or(true, |ty| match *ty.kind() {
++ ty::Param(_) => true,
++ ty::Adt(def, _) => def.did == args.ty_did,
++ _ => false,
++ })
++ {
++ // Passed to a function taking the non-dereferenced type.
++ set_skip_flag();
++ }
++ },
++ ExprKind::MethodCall(name, expr_args @ [self_arg, ..], _) => {
++ let i = expr_args.iter().position(|arg| arg.hir_id == child_id).unwrap_or(0);
++ if i == 0 {
++ // Check if the method can be renamed.
++ let name = name.ident.as_str();
++ if let Some((_, replacement)) = args.method_renames.iter().find(|&&(x, _)| x == name) {
++ result.replacements.push(PtrArgReplacement {
++ expr_span: e.span,
++ self_span: self_arg.span,
++ replacement,
++ });
++ return;
++ }
++ }
++
++ let id = if let Some(x) = self.cx.typeck_results().type_dependent_def_id(e.hir_id) {
++ x
++ } else {
++ set_skip_flag();
++ return;
++ };
++
++ match *self.cx.tcx.fn_sig(id).skip_binder().inputs()[i].peel_refs().kind() {
++ ty::Param(_) => {
++ set_skip_flag();
++ },
++ // If the types match check for methods which exist on both types. e.g. `Vec::len` and
++ // `slice::len`
++ ty::Adt(def, _)
++ if def.did == args.ty_did
++ && (i != 0
++ || self.cx.tcx.trait_of_item(id).is_some()
++ || !args.deref_assoc_items.map_or(false, |(id, items)| {
++ items
++ .find_by_name_and_kind(self.cx.tcx, name.ident, AssocKind::Fn, id)
++ .is_some()
++ })) =>
++ {
++ set_skip_flag();
++ },
++ _ => (),
++ }
++ },
++ // Indexing is fine for currently supported types.
++ ExprKind::Index(e, _) if e.hir_id == child_id => (),
++ _ => set_skip_flag(),
++ },
++ _ => set_skip_flag(),
++ }
+ }
+ }
++
++ let mut skip_count = 0;
++ let mut results = args.iter().map(|_| PtrArgResult::default()).collect::<Vec<_>>();
++ let mut v = V {
++ cx,
++ bindings: args
++ .iter()
++ .enumerate()
++ .filter_map(|(i, arg)| {
++ let param = &body.params[arg.idx];
++ match param.pat.kind {
++ PatKind::Binding(BindingAnnotation::Unannotated, id, _, None)
++ if !is_lint_allowed(cx, PTR_ARG, param.hir_id) =>
++ {
++ Some((id, i))
++ },
++ _ => {
++ skip_count += 1;
++ results[arg.idx].skip = true;
++ None
++ },
++ }
++ })
++ .collect(),
++ args,
++ results,
++ skip_count,
++ };
++ v.visit_expr(&body.value);
++ v.results
+}
+
++fn get_rptr_lm<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
+ if let TyKind::Rptr(ref lt, ref m) = ty.kind {
+ Some((lt, m.mutbl, ty.span))
+ } else {
+ None
+ }
+}
+
+fn is_null_path(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ if let ExprKind::Call(pathexp, []) = expr.kind {
+ expr_path_res(cx, pathexp).opt_def_id().map_or(false, |id| {
+ match_any_diagnostic_items(cx, id, &[sym::ptr_null, sym::ptr_null_mut]).is_some()
+ })
+ } else {
+ false
+ }
+}
--- /dev/null
- use clippy_utils::sugg::Sugg;
+use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::source::{snippet_opt, snippet_with_applicability};
-
- declare_clippy_lint! {
- /// ### What it does
- /// Checks for references in expressions that use
- /// auto dereference.
- ///
- /// ### Why is this bad?
- /// The reference is a no-op and is automatically
- /// dereferenced by the compiler and makes the code less clear.
- ///
- /// ### Example
- /// ```rust
- /// struct Point(u32, u32);
- /// let point = Point(30, 20);
- /// let x = (&point).0;
- /// ```
- /// Use instead:
- /// ```rust
- /// # struct Point(u32, u32);
- /// # let point = Point(30, 20);
- /// let x = point.0;
- /// ```
- #[clippy::version = "pre 1.29.0"]
- pub REF_IN_DEREF,
- complexity,
- "Use of reference in auto dereference expression."
- }
-
- declare_lint_pass!(RefInDeref => [REF_IN_DEREF]);
-
- impl EarlyLintPass for RefInDeref {
- fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) {
- if_chain! {
- if let ExprKind::Field(ref object, _) = e.kind;
- if let ExprKind::Paren(ref parened) = object.kind;
- if let ExprKind::AddrOf(_, _, ref inner) = parened.kind;
- then {
- let applicability = if inner.span.from_expansion() {
- Applicability::MaybeIncorrect
- } else {
- Applicability::MachineApplicable
- };
- let sugg = Sugg::ast(cx, inner, "_").maybe_par();
- span_lint_and_sugg(
- cx,
- REF_IN_DEREF,
- object.span,
- "creating a reference that is immediately dereferenced",
- "try this",
- sugg.to_string(),
- applicability,
- );
- }
- }
- }
- }
+use if_chain::if_chain;
+use rustc_ast::ast::{Expr, ExprKind, Mutability, UnOp};
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::BytePos;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for usage of `*&` and `*&mut` in expressions.
+ ///
+ /// ### Why is this bad?
+ /// Immediately dereferencing a reference is no-op and
+ /// makes the code less clear.
+ ///
+ /// ### Known problems
+ /// Multiple dereference/addrof pairs are not handled so
+ /// the suggested fix for `x = **&&y` is `x = *&y`, which is still incorrect.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// // Bad
+ /// let a = f(*&mut b);
+ /// let c = *&d;
+ ///
+ /// // Good
+ /// let a = f(b);
+ /// let c = d;
+ /// ```
+ #[clippy::version = "pre 1.29.0"]
+ pub DEREF_ADDROF,
+ complexity,
+ "use of `*&` or `*&mut` in an expression"
+}
+
+declare_lint_pass!(DerefAddrOf => [DEREF_ADDROF]);
+
+fn without_parens(mut e: &Expr) -> &Expr {
+ while let ExprKind::Paren(ref child_e) = e.kind {
+ e = child_e;
+ }
+ e
+}
+
+impl EarlyLintPass for DerefAddrOf {
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) {
+ if_chain! {
+ if let ExprKind::Unary(UnOp::Deref, ref deref_target) = e.kind;
+ if let ExprKind::AddrOf(_, ref mutability, ref addrof_target) = without_parens(deref_target).kind;
+ if deref_target.span.ctxt() == e.span.ctxt();
+ if !addrof_target.span.from_expansion();
+ then {
+ let mut applicability = Applicability::MachineApplicable;
+ let sugg = if e.span.from_expansion() {
+ #[allow(clippy::option_if_let_else)]
+ if let Some(macro_source) = snippet_opt(cx, e.span) {
+ // Remove leading whitespace from the given span
+ // e.g: ` $visitor` turns into `$visitor`
+ let trim_leading_whitespaces = |span| {
+ snippet_opt(cx, span).and_then(|snip| {
+ #[allow(clippy::cast_possible_truncation)]
+ snip.find(|c: char| !c.is_whitespace()).map(|pos| {
+ span.lo() + BytePos(pos as u32)
+ })
+ }).map_or(span, |start_no_whitespace| e.span.with_lo(start_no_whitespace))
+ };
+
+ let mut generate_snippet = |pattern: &str| {
+ #[allow(clippy::cast_possible_truncation)]
+ macro_source.rfind(pattern).map(|pattern_pos| {
+ let rpos = pattern_pos + pattern.len();
+ let span_after_ref = e.span.with_lo(BytePos(e.span.lo().0 + rpos as u32));
+ let span = trim_leading_whitespaces(span_after_ref);
+ snippet_with_applicability(cx, span, "_", &mut applicability)
+ })
+ };
+
+ if *mutability == Mutability::Mut {
+ generate_snippet("mut")
+ } else {
+ generate_snippet("&")
+ }
+ } else {
+ Some(snippet_with_applicability(cx, e.span, "_", &mut applicability))
+ }
+ } else {
+ Some(snippet_with_applicability(cx, addrof_target.span, "_", &mut applicability))
+ };
+ if let Some(sugg) = sugg {
+ span_lint_and_sugg(
+ cx,
+ DEREF_ADDROF,
+ e.span,
+ "immediately dereferencing a reference",
+ "try this",
+ sugg.to_string(),
+ applicability,
+ );
+ }
+ }
+ }
+ }
+}
--- /dev/null
- use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use clippy_utils::diagnostics::span_lint_and_help;
+use clippy_utils::source::{snippet, snippet_with_applicability};
+use clippy_utils::{SpanlessEq, SpanlessHash};
+use core::hash::{Hash, Hasher};
+use if_chain::if_chain;
- let mut self_bounds_set = FxHashSet::default();
++use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::unhash::UnhashMap;
+use rustc_errors::Applicability;
+use rustc_hir::def::Res;
+use rustc_hir::{
+ GenericBound, Generics, Item, ItemKind, Node, ParamName, Path, PathSegment, QPath, TraitItem, Ty, TyKind,
+ WherePredicate,
+};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::Span;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// This lint warns about unnecessary type repetitions in trait bounds
+ ///
+ /// ### Why is this bad?
+ /// Repeating the type for every bound makes the code
+ /// less readable than combining the bounds
+ ///
+ /// ### Example
+ /// ```rust
+ /// pub fn foo<T>(t: T) where T: Copy, T: Clone {}
+ /// ```
+ ///
+ /// Could be written as:
+ ///
+ /// ```rust
+ /// pub fn foo<T>(t: T) where T: Copy + Clone {}
+ /// ```
+ #[clippy::version = "1.38.0"]
+ pub TYPE_REPETITION_IN_BOUNDS,
+ pedantic,
+ "Types are repeated unnecessary in trait bounds use `+` instead of using `T: _, T: _`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for cases where generics are being used and multiple
+ /// syntax specifications for trait bounds are used simultaneously.
+ ///
+ /// ### Why is this bad?
+ /// Duplicate bounds makes the code
+ /// less readable than specifing them only once.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn func<T: Clone + Default>(arg: T) where T: Clone + Default {}
+ /// ```
+ ///
+ /// Could be written as:
+ ///
+ /// ```rust
+ /// fn func<T: Clone + Default>(arg: T) {}
+ /// ```
+ /// or
+ ///
+ /// ```rust
+ /// fn func<T>(arg: T) where T: Clone + Default {}
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub TRAIT_DUPLICATION_IN_BOUNDS,
+ pedantic,
+ "Check if the same trait bounds are specified twice during a function declaration"
+}
+
+#[derive(Copy, Clone)]
+pub struct TraitBounds {
+ max_trait_bounds: u64,
+}
+
+impl TraitBounds {
+ #[must_use]
+ pub fn new(max_trait_bounds: u64) -> Self {
+ Self { max_trait_bounds }
+ }
+}
+
+impl_lint_pass!(TraitBounds => [TYPE_REPETITION_IN_BOUNDS, TRAIT_DUPLICATION_IN_BOUNDS]);
+
+impl<'tcx> LateLintPass<'tcx> for TraitBounds {
+ fn check_generics(&mut self, cx: &LateContext<'tcx>, gen: &'tcx Generics<'_>) {
+ self.check_type_repetition(cx, gen);
+ check_trait_bound_duplication(cx, gen);
+ }
+
+ fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'tcx>) {
+ let Generics { where_clause, .. } = &item.generics;
- if self_bounds_set.is_empty() {
++ let mut self_bounds_map = FxHashMap::default();
+
+ for predicate in where_clause.predicates {
+ if_chain! {
+ if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate;
+ if !bound_predicate.span.from_expansion();
+ if let TyKind::Path(QPath::Resolved(_, Path { segments, .. })) = bound_predicate.bounded_ty.kind;
+ if let Some(PathSegment { res: Some(Res::SelfTy(Some(def_id), _)), .. }) = segments.first();
+
+ if let Some(
+ Node::Item(
+ Item {
+ kind: ItemKind::Trait(_, _, _, self_bounds, _),
+ .. }
+ )
+ ) = cx.tcx.hir().get_if_local(*def_id);
+ then {
- let Some((self_res, _)) = get_trait_res_span_from_bound(bound) else { continue };
- self_bounds_set.insert(self_res);
++ if self_bounds_map.is_empty() {
+ for bound in self_bounds.iter() {
- .filter_map(get_trait_res_span_from_bound)
- .for_each(|(trait_item_res, span)| {
- if self_bounds_set.get(&trait_item_res).is_some() {
- span_lint_and_help(
- cx,
- TRAIT_DUPLICATION_IN_BOUNDS,
- span,
- "this trait bound is already specified in trait declaration",
- None,
- "consider removing this trait bound",
- );
++ let Some((self_res, self_segments, _)) = get_trait_info_from_bound(bound) else { continue };
++ self_bounds_map.insert(self_res, self_segments);
+ }
+ }
+
+ bound_predicate
+ .bounds
+ .iter()
- fn get_trait_res_span_from_bound(bound: &GenericBound<'_>) -> Option<(Res, Span)> {
- if let GenericBound::Trait(t, _) = bound {
- Some((t.trait_ref.path.res, t.span))
- } else {
- None
- }
- }
-
++ .filter_map(get_trait_info_from_bound)
++ .for_each(|(trait_item_res, trait_item_segments, span)| {
++ if let Some(self_segments) = self_bounds_map.get(&trait_item_res) {
++ if SpanlessEq::new(cx).eq_path_segments(self_segments, trait_item_segments) {
++ span_lint_and_help(
++ cx,
++ TRAIT_DUPLICATION_IN_BOUNDS,
++ span,
++ "this trait bound is already specified in trait declaration",
++ None,
++ "consider removing this trait bound",
++ );
++ }
+ }
+ });
+ }
+ }
+ }
+ }
+}
+
- .filter_map(get_trait_res_span_from_bound)
+impl TraitBounds {
+ fn check_type_repetition<'tcx>(self, cx: &LateContext<'tcx>, gen: &'tcx Generics<'_>) {
+ struct SpanlessTy<'cx, 'tcx> {
+ ty: &'tcx Ty<'tcx>,
+ cx: &'cx LateContext<'tcx>,
+ }
+ impl PartialEq for SpanlessTy<'_, '_> {
+ fn eq(&self, other: &Self) -> bool {
+ let mut eq = SpanlessEq::new(self.cx);
+ eq.inter_expr().eq_ty(self.ty, other.ty)
+ }
+ }
+ impl Hash for SpanlessTy<'_, '_> {
+ fn hash<H: Hasher>(&self, h: &mut H) {
+ let mut t = SpanlessHash::new(self.cx);
+ t.hash_ty(self.ty);
+ h.write_u64(t.finish());
+ }
+ }
+ impl Eq for SpanlessTy<'_, '_> {}
+
+ if gen.span.from_expansion() {
+ return;
+ }
+ let mut map: UnhashMap<SpanlessTy<'_, '_>, Vec<&GenericBound<'_>>> = UnhashMap::default();
+ let mut applicability = Applicability::MaybeIncorrect;
+ for bound in gen.where_clause.predicates {
+ if_chain! {
+ if let WherePredicate::BoundPredicate(ref p) = bound;
+ if p.bounds.len() as u64 <= self.max_trait_bounds;
+ if !p.span.from_expansion();
+ if let Some(ref v) = map.insert(
+ SpanlessTy { ty: p.bounded_ty, cx },
+ p.bounds.iter().collect::<Vec<_>>()
+ );
+
+ then {
+ let mut hint_string = format!(
+ "consider combining the bounds: `{}:",
+ snippet(cx, p.bounded_ty.span, "_")
+ );
+ for b in v.iter() {
+ if let GenericBound::Trait(ref poly_trait_ref, _) = b {
+ let path = &poly_trait_ref.trait_ref.path;
+ hint_string.push_str(&format!(
+ " {} +",
+ snippet_with_applicability(cx, path.span, "..", &mut applicability)
+ ));
+ }
+ }
+ for b in p.bounds.iter() {
+ if let GenericBound::Trait(ref poly_trait_ref, _) = b {
+ let path = &poly_trait_ref.trait_ref.path;
+ hint_string.push_str(&format!(
+ " {} +",
+ snippet_with_applicability(cx, path.span, "..", &mut applicability)
+ ));
+ }
+ }
+ hint_string.truncate(hint_string.len() - 2);
+ hint_string.push('`');
+ span_lint_and_help(
+ cx,
+ TYPE_REPETITION_IN_BOUNDS,
+ p.span,
+ "this type has already been used as a bound predicate",
+ None,
+ &hint_string,
+ );
+ }
+ }
+ }
+ }
+}
+
+fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
+ if gen.span.from_expansion() || gen.params.is_empty() || gen.where_clause.predicates.is_empty() {
+ return;
+ }
+
+ let mut map = FxHashMap::default();
+ for param in gen.params {
+ if let ParamName::Plain(ref ident) = param.name {
+ let res = param
+ .bounds
+ .iter()
- for (res_where, _) in bound_predicate.bounds.iter().filter_map(get_trait_res_span_from_bound) {
- if let Some((_, span_direct)) = trait_resolutions_direct
++ .filter_map(get_trait_info_from_bound)
+ .collect::<Vec<_>>();
+ map.insert(*ident, res);
+ }
+ }
+
+ for predicate in gen.where_clause.predicates {
+ if_chain! {
+ if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate;
+ if !bound_predicate.span.from_expansion();
+ if let TyKind::Path(QPath::Resolved(_, Path { segments, .. })) = bound_predicate.bounded_ty.kind;
+ if let Some(segment) = segments.first();
+ if let Some(trait_resolutions_direct) = map.get(&segment.ident);
+ then {
- .find(|(res_direct, _)| *res_direct == res_where) {
++ for (res_where, _, _) in bound_predicate.bounds.iter().filter_map(get_trait_info_from_bound) {
++ if let Some((_, _, span_direct)) = trait_resolutions_direct
+ .iter()
++ .find(|(res_direct, _, _)| *res_direct == res_where) {
+ span_lint_and_help(
+ cx,
+ TRAIT_DUPLICATION_IN_BOUNDS,
+ *span_direct,
+ "this trait bound is already specified in the where clause",
+ None,
+ "consider removing this trait bound",
+ );
+ }
+ }
+ }
+ }
+ }
+}
++
++fn get_trait_info_from_bound<'a>(bound: &'a GenericBound<'_>) -> Option<(Res, &'a [PathSegment<'a>], Span)> {
++ if let GenericBound::Trait(t, _) = bound {
++ Some((t.trait_ref.path.res, t.trait_ref.path.segments, t.span))
++ } else {
++ None
++ }
++}
--- /dev/null
- if ord_preds.iter().any(|ord| Some(ord.self_ty()) ==
- return_ty_pred.term.ty()) {
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
+use clippy_utils::{get_trait_def_id, paths};
+use if_chain::if_chain;
+use rustc_hir::def_id::DefId;
+use rustc_hir::{Expr, ExprKind, StmtKind};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_middle::ty::{GenericPredicates, PredicateKind, ProjectionPredicate, TraitPredicate};
+use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::{BytePos, Span};
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for functions that expect closures of type
+ /// Fn(...) -> Ord where the implemented closure returns the unit type.
+ /// The lint also suggests to remove the semi-colon at the end of the statement if present.
+ ///
+ /// ### Why is this bad?
+ /// Likely, returning the unit type is unintentional, and
+ /// could simply be caused by an extra semi-colon. Since () implements Ord
+ /// it doesn't cause a compilation error.
+ /// This is the same reasoning behind the unit_cmp lint.
+ ///
+ /// ### Known problems
+ /// If returning unit is intentional, then there is no
+ /// way of specifying this without triggering needless_return lint
+ ///
+ /// ### Example
+ /// ```rust
+ /// let mut twins = vec!((1, 1), (2, 2));
+ /// twins.sort_by_key(|x| { x.1; });
+ /// ```
+ #[clippy::version = "1.47.0"]
+ pub UNIT_RETURN_EXPECTING_ORD,
+ correctness,
+ "fn arguments of type Fn(...) -> Ord returning the unit type ()."
+}
+
+declare_lint_pass!(UnitReturnExpectingOrd => [UNIT_RETURN_EXPECTING_ORD]);
+
+fn get_trait_predicates_for_trait_id<'tcx>(
+ cx: &LateContext<'tcx>,
+ generics: GenericPredicates<'tcx>,
+ trait_id: Option<DefId>,
+) -> Vec<TraitPredicate<'tcx>> {
+ let mut preds = Vec::new();
+ for (pred, _) in generics.predicates {
+ if_chain! {
+ if let PredicateKind::Trait(poly_trait_pred) = pred.kind().skip_binder();
+ let trait_pred = cx.tcx.erase_late_bound_regions(pred.kind().rebind(poly_trait_pred));
+ if let Some(trait_def_id) = trait_id;
+ if trait_def_id == trait_pred.trait_ref.def_id;
+ then {
+ preds.push(trait_pred);
+ }
+ }
+ }
+ preds
+}
+
+fn get_projection_pred<'tcx>(
+ cx: &LateContext<'tcx>,
+ generics: GenericPredicates<'tcx>,
+ trait_pred: TraitPredicate<'tcx>,
+) -> Option<ProjectionPredicate<'tcx>> {
+ generics.predicates.iter().find_map(|(proj_pred, _)| {
+ if let ty::PredicateKind::Projection(pred) = proj_pred.kind().skip_binder() {
+ let projection_pred = cx.tcx.erase_late_bound_regions(proj_pred.kind().rebind(pred));
+ if projection_pred.projection_ty.substs == trait_pred.trait_ref.substs {
+ return Some(projection_pred);
+ }
+ }
+ None
+ })
+}
+
+fn get_args_to_check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Vec<(usize, String)> {
+ let mut args_to_check = Vec::new();
+ if let Some(def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id) {
+ let fn_sig = cx.tcx.fn_sig(def_id);
+ let generics = cx.tcx.predicates_of(def_id);
+ let fn_mut_preds = get_trait_predicates_for_trait_id(cx, generics, cx.tcx.lang_items().fn_mut_trait());
+ let ord_preds = get_trait_predicates_for_trait_id(cx, generics, get_trait_def_id(cx, &paths::ORD));
+ let partial_ord_preds =
+ get_trait_predicates_for_trait_id(cx, generics, cx.tcx.lang_items().partial_ord_trait());
+ // Trying to call erase_late_bound_regions on fn_sig.inputs() gives the following error
+ // The trait `rustc::ty::TypeFoldable<'_>` is not implemented for `&[&rustc::ty::TyS<'_>]`
+ let inputs_output = cx.tcx.erase_late_bound_regions(fn_sig.inputs_and_output());
+ inputs_output
+ .iter()
+ .rev()
+ .skip(1)
+ .rev()
+ .enumerate()
+ .for_each(|(i, inp)| {
+ for trait_pred in &fn_mut_preds {
+ if_chain! {
+ if trait_pred.self_ty() == inp;
+ if let Some(return_ty_pred) = get_projection_pred(cx, generics, *trait_pred);
+ then {
- } else if partial_ord_preds.iter().any(|pord| pord.self_ty() == return_ty_pred.term.ty().unwrap()) {
++ if ord_preds.iter().any(|ord| Some(ord.self_ty()) == return_ty_pred.term.ty()) {
+ args_to_check.push((i, "Ord".to_string()));
++ } else if partial_ord_preds.iter().any(|pord| {
++ pord.self_ty() == return_ty_pred.term.ty().unwrap()
++ }) {
+ args_to_check.push((i, "PartialOrd".to_string()));
+ }
+ }
+ }
+ }
+ });
+ }
+ args_to_check
+}
+
+fn check_arg<'tcx>(cx: &LateContext<'tcx>, arg: &'tcx Expr<'tcx>) -> Option<(Span, Option<Span>)> {
+ if_chain! {
+ if let ExprKind::Closure(_, _fn_decl, body_id, span, _) = arg.kind;
+ if let ty::Closure(_def_id, substs) = &cx.typeck_results().node_type(arg.hir_id).kind();
+ let ret_ty = substs.as_closure().sig().output();
+ let ty = cx.tcx.erase_late_bound_regions(ret_ty);
+ if ty.is_unit();
+ then {
+ let body = cx.tcx.hir().body(body_id);
+ if_chain! {
+ if let ExprKind::Block(block, _) = body.value.kind;
+ if block.expr.is_none();
+ if let Some(stmt) = block.stmts.last();
+ if let StmtKind::Semi(_) = stmt.kind;
+ then {
+ let data = stmt.span.data();
+ // Make a span out of the semicolon for the help message
+ Some((span, Some(data.with_lo(data.hi-BytePos(1)))))
+ } else {
+ Some((span, None))
+ }
+ }
+ } else {
+ None
+ }
+ }
+}
+
+impl<'tcx> LateLintPass<'tcx> for UnitReturnExpectingOrd {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
+ if let ExprKind::MethodCall(_, args, _) = expr.kind {
+ let arg_indices = get_args_to_check(cx, expr);
+ for (i, trait_name) in arg_indices {
+ if i < args.len() {
+ match check_arg(cx, &args[i]) {
+ Some((span, None)) => {
+ span_lint(
+ cx,
+ UNIT_RETURN_EXPECTING_ORD,
+ span,
+ &format!(
+ "this closure returns \
+ the unit type which also implements {}",
+ trait_name
+ ),
+ );
+ },
+ Some((span, Some(last_semi))) => {
+ span_lint_and_help(
+ cx,
+ UNIT_RETURN_EXPECTING_ORD,
+ span,
+ &format!(
+ "this closure returns \
+ the unit type which also implements {}",
+ trait_name
+ ),
+ Some(last_semi),
+ "probably caused by this trailing semicolon",
+ );
+ },
+ None => {},
+ }
+ }
+ }
+ }
+ }
+}
--- /dev/null
- fps1: &mut Vec<ast::PatField>,
+#![allow(clippy::wildcard_imports, clippy::enum_glob_use)]
+
+use clippy_utils::ast_utils::{eq_field_pat, eq_id, eq_maybe_qself, eq_pat, eq_path};
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::{meets_msrv, msrvs, over};
+use rustc_ast::mut_visit::*;
+use rustc_ast::ptr::P;
+use rustc_ast::{self as ast, Pat, PatKind, PatKind::*, DUMMY_NODE_ID};
+use rustc_ast_pretty::pprust;
+use rustc_errors::Applicability;
+use rustc_lint::{EarlyContext, EarlyLintPass};
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::DUMMY_SP;
+
+use std::cell::Cell;
+use std::mem;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnested or-patterns, e.g., `Some(0) | Some(2)` and
+ /// suggests replacing the pattern with a nested one, `Some(0 | 2)`.
+ ///
+ /// Another way to think of this is that it rewrites patterns in
+ /// *disjunctive normal form (DNF)* into *conjunctive normal form (CNF)*.
+ ///
+ /// ### Why is this bad?
+ /// In the example above, `Some` is repeated, which unncessarily complicates the pattern.
+ ///
+ /// ### Example
+ /// ```rust
+ /// fn main() {
+ /// if let Some(0) | Some(2) = Some(0) {}
+ /// }
+ /// ```
+ /// Use instead:
+ /// ```rust
+ /// fn main() {
+ /// if let Some(0 | 2) = Some(0) {}
+ /// }
+ /// ```
+ #[clippy::version = "1.46.0"]
+ pub UNNESTED_OR_PATTERNS,
+ pedantic,
+ "unnested or-patterns, e.g., `Foo(Bar) | Foo(Baz) instead of `Foo(Bar | Baz)`"
+}
+
+#[derive(Clone, Copy)]
+pub struct UnnestedOrPatterns {
+ msrv: Option<RustcVersion>,
+}
+
+impl UnnestedOrPatterns {
+ #[must_use]
+ pub fn new(msrv: Option<RustcVersion>) -> Self {
+ Self { msrv }
+ }
+}
+
+impl_lint_pass!(UnnestedOrPatterns => [UNNESTED_OR_PATTERNS]);
+
+impl EarlyLintPass for UnnestedOrPatterns {
+ fn check_arm(&mut self, cx: &EarlyContext<'_>, a: &ast::Arm) {
+ if meets_msrv(self.msrv.as_ref(), &msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &a.pat);
+ }
+ }
+
+ fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &ast::Expr) {
+ if meets_msrv(self.msrv.as_ref(), &msrvs::OR_PATTERNS) {
+ if let ast::ExprKind::Let(pat, _, _) = &e.kind {
+ lint_unnested_or_patterns(cx, pat);
+ }
+ }
+ }
+
+ fn check_param(&mut self, cx: &EarlyContext<'_>, p: &ast::Param) {
+ if meets_msrv(self.msrv.as_ref(), &msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &p.pat);
+ }
+ }
+
+ fn check_local(&mut self, cx: &EarlyContext<'_>, l: &ast::Local) {
+ if meets_msrv(self.msrv.as_ref(), &msrvs::OR_PATTERNS) {
+ lint_unnested_or_patterns(cx, &l.pat);
+ }
+ }
+
+ extract_msrv_attr!(EarlyContext);
+}
+
+fn lint_unnested_or_patterns(cx: &EarlyContext<'_>, pat: &Pat) {
+ if let Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) = pat.kind {
+ // This is a leaf pattern, so cloning is unprofitable.
+ return;
+ }
+
+ let mut pat = P(pat.clone());
+
+ // Nix all the paren patterns everywhere so that they aren't in our way.
+ remove_all_parens(&mut pat);
+
+ // Transform all unnested or-patterns into nested ones, and if there were none, quit.
+ if !unnest_or_patterns(&mut pat) {
+ return;
+ }
+
+ span_lint_and_then(cx, UNNESTED_OR_PATTERNS, pat.span, "unnested or-patterns", |db| {
+ insert_necessary_parens(&mut pat);
+ db.span_suggestion_verbose(
+ pat.span,
+ "nest the patterns",
+ pprust::pat_to_string(&pat),
+ Applicability::MachineApplicable,
+ );
+ });
+}
+
+/// Remove all `(p)` patterns in `pat`.
+fn remove_all_parens(pat: &mut P<Pat>) {
+ struct Visitor;
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, pat: &mut P<Pat>) {
+ noop_visit_pat(pat, self);
+ let inner = match &mut pat.kind {
+ Paren(i) => mem::replace(&mut i.kind, Wild),
+ _ => return,
+ };
+ pat.kind = inner;
+ }
+ }
+ Visitor.visit_pat(pat);
+}
+
+/// Insert parens where necessary according to Rust's precedence rules for patterns.
+fn insert_necessary_parens(pat: &mut P<Pat>) {
+ struct Visitor;
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, pat: &mut P<Pat>) {
+ use ast::{BindingMode::*, Mutability::*};
+ noop_visit_pat(pat, self);
+ let target = match &mut pat.kind {
+ // `i @ a | b`, `box a | b`, and `& mut? a | b`.
+ Ident(.., Some(p)) | Box(p) | Ref(p, _) if matches!(&p.kind, Or(ps) if ps.len() > 1) => p,
+ Ref(p, Not) if matches!(p.kind, Ident(ByValue(Mut), ..)) => p, // `&(mut x)`
+ _ => return,
+ };
+ target.kind = Paren(P(take_pat(target)));
+ }
+ }
+ Visitor.visit_pat(pat);
+}
+
+/// Unnest or-patterns `p0 | ... | p1` in the pattern `pat`.
+/// For example, this would transform `Some(0) | FOO | Some(2)` into `Some(0 | 2) | FOO`.
+fn unnest_or_patterns(pat: &mut P<Pat>) -> bool {
+ struct Visitor {
+ changed: bool,
+ }
+ impl MutVisitor for Visitor {
+ fn visit_pat(&mut self, p: &mut P<Pat>) {
+ // This is a bottom up transformation, so recurse first.
+ noop_visit_pat(p, self);
+
+ // Don't have an or-pattern? Just quit early on.
+ let alternatives = match &mut p.kind {
+ Or(ps) => ps,
+ _ => return,
+ };
+
+ // Collapse or-patterns directly nested in or-patterns.
+ let mut idx = 0;
+ let mut this_level_changed = false;
+ while idx < alternatives.len() {
+ let inner = if let Or(ps) = &mut alternatives[idx].kind {
+ mem::take(ps)
+ } else {
+ idx += 1;
+ continue;
+ };
+ this_level_changed = true;
+ alternatives.splice(idx..=idx, inner);
+ }
+
+ // Focus on `p_n` and then try to transform all `p_i` where `i > n`.
+ let mut focus_idx = 0;
+ while focus_idx < alternatives.len() {
+ this_level_changed |= transform_with_focus_on_idx(alternatives, focus_idx);
+ focus_idx += 1;
+ }
+ self.changed |= this_level_changed;
+
+ // Deal with `Some(Some(0)) | Some(Some(1))`.
+ if this_level_changed {
+ noop_visit_pat(p, self);
+ }
+ }
+ }
+
+ let mut visitor = Visitor { changed: false };
+ visitor.visit_pat(pat);
+ visitor.changed
+}
+
+/// Match `$scrutinee` against `$pat` and extract `$then` from it.
+/// Panics if there is no match.
+macro_rules! always_pat {
+ ($scrutinee:expr, $pat:pat => $then:expr) => {
+ match $scrutinee {
+ $pat => $then,
+ _ => unreachable!(),
+ }
+ };
+}
+
+/// Focus on `focus_idx` in `alternatives`,
+/// attempting to extend it with elements of the same constructor `C`
+/// in `alternatives[focus_idx + 1..]`.
+fn transform_with_focus_on_idx(alternatives: &mut Vec<P<Pat>>, focus_idx: usize) -> bool {
+ // Extract the kind; we'll need to make some changes in it.
+ let mut focus_kind = mem::replace(&mut alternatives[focus_idx].kind, PatKind::Wild);
+ // We'll focus on `alternatives[focus_idx]`,
+ // so we're draining from `alternatives[focus_idx + 1..]`.
+ let start = focus_idx + 1;
+
+ // We're trying to find whatever kind (~"constructor") we found in `alternatives[start..]`.
+ let changed = match &mut focus_kind {
+ // These pattern forms are "leafs" and do not have sub-patterns.
+ // Therefore they are not some form of constructor `C`,
+ // with which a pattern `C(p_0)` may be formed,
+ // which we would want to join with other `C(p_j)`s.
+ Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_)
+ // Dealt with elsewhere.
+ | Or(_) | Paren(_) => false,
+ // Transform `box x | ... | box y` into `box (x | y)`.
+ //
+ // The cases below until `Slice(...)` deal with *singleton* products.
+ // These patterns have the shape `C(p)`, and not e.g., `C(p0, ..., pn)`.
+ Box(target) => extend_with_matching(
+ target, start, alternatives,
+ |k| matches!(k, Box(_)),
+ |k| always_pat!(k, Box(p) => p),
+ ),
+ // Transform `&m x | ... | &m y` into `&m (x | y)`.
+ Ref(target, m1) => extend_with_matching(
+ target, start, alternatives,
+ |k| matches!(k, Ref(_, m2) if m1 == m2), // Mutabilities must match.
+ |k| always_pat!(k, Ref(p, _) => p),
+ ),
+ // Transform `b @ p0 | ... b @ p1` into `b @ (p0 | p1)`.
+ Ident(b1, i1, Some(target)) => extend_with_matching(
+ target, start, alternatives,
+ // Binding names must match.
+ |k| matches!(k, Ident(b2, i2, Some(_)) if b1 == b2 && eq_id(*i1, *i2)),
+ |k| always_pat!(k, Ident(_, _, Some(p)) => p),
+ ),
+ // Transform `[pre, x, post] | ... | [pre, y, post]` into `[pre, x | y, post]`.
+ Slice(ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(k, Slice(ps2) if eq_pre_post(ps1, ps2, idx)),
+ |k| always_pat!(k, Slice(ps) => ps),
+ ),
+ // Transform `(pre, x, post) | ... | (pre, y, post)` into `(pre, x | y, post)`.
+ Tuple(ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(k, Tuple(ps2) if eq_pre_post(ps1, ps2, idx)),
+ |k| always_pat!(k, Tuple(ps) => ps),
+ ),
+ // Transform `S(pre, x, post) | ... | S(pre, y, post)` into `S(pre, x | y, post)`.
+ TupleStruct(qself1, path1, ps1) => extend_with_matching_product(
+ ps1, start, alternatives,
+ |k, ps1, idx| matches!(
+ k,
+ TupleStruct(qself2, path2, ps2)
+ if eq_maybe_qself(qself1, qself2) && eq_path(path1, path2) && eq_pre_post(ps1, ps2, idx)
+ ),
+ |k| always_pat!(k, TupleStruct(_, _, ps) => ps),
+ ),
+ // Transform a record pattern `S { fp_0, ..., fp_n }`.
+ Struct(qself1, path1, fps1, rest1) => extend_with_struct_pat(qself1, path1, fps1, *rest1, start, alternatives),
+ };
+
+ alternatives[focus_idx].kind = focus_kind;
+ changed
+}
+
+/// Here we focusing on a record pattern `S { fp_0, ..., fp_n }`.
+/// In particular, for a record pattern, the order in which the field patterns is irrelevant.
+/// So when we fixate on some `ident_k: pat_k`, we try to find `ident_k` in the other pattern
+/// and check that all `fp_i` where `i ∈ ((0...n) \ k)` between two patterns are equal.
+fn extend_with_struct_pat(
+ qself1: &Option<ast::QSelf>,
+ path1: &ast::Path,
- targets: &mut Vec<P<Pat>>,
++ fps1: &mut [ast::PatField],
+ rest1: bool,
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+) -> bool {
+ (0..fps1.len()).any(|idx| {
+ let pos_in_2 = Cell::new(None); // The element `k`.
+ let tail_or = drain_matching(
+ start,
+ alternatives,
+ |k| {
+ matches!(k, Struct(qself2, path2, fps2, rest2)
+ if rest1 == *rest2 // If one struct pattern has `..` so must the other.
+ && eq_maybe_qself(qself1, qself2)
+ && eq_path(path1, path2)
+ && fps1.len() == fps2.len()
+ && fps1.iter().enumerate().all(|(idx_1, fp1)| {
+ if idx_1 == idx {
+ // In the case of `k`, we merely require identical field names
+ // so that we will transform into `ident_k: p1_k | p2_k`.
+ let pos = fps2.iter().position(|fp2| eq_id(fp1.ident, fp2.ident));
+ pos_in_2.set(pos);
+ pos.is_some()
+ } else {
+ fps2.iter().any(|fp2| eq_field_pat(fp1, fp2))
+ }
+ }))
+ },
+ // Extract `p2_k`.
+ |k| always_pat!(k, Struct(_, _, mut fps, _) => fps.swap_remove(pos_in_2.take().unwrap()).pat),
+ );
+ extend_with_tail_or(&mut fps1[idx].pat, tail_or)
+ })
+}
+
+/// Like `extend_with_matching` but for products with > 1 factor, e.g., `C(p_0, ..., p_n)`.
+/// Here, the idea is that we fixate on some `p_k` in `C`,
+/// allowing it to vary between two `targets` and `ps2` (returned by `extract`),
+/// while also requiring `ps1[..n] ~ ps2[..n]` (pre) and `ps1[n + 1..] ~ ps2[n + 1..]` (post),
+/// where `~` denotes semantic equality.
+fn extend_with_matching_product(
++ targets: &mut [P<Pat>],
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind, &[P<Pat>], usize) -> bool,
+ extract: impl Fn(PatKind) -> Vec<P<Pat>>,
+) -> bool {
+ (0..targets.len()).any(|idx| {
+ let tail_or = drain_matching(
+ start,
+ alternatives,
+ |k| predicate(k, targets, idx),
+ |k| extract(k).swap_remove(idx),
+ );
+ extend_with_tail_or(&mut targets[idx], tail_or)
+ })
+}
+
+/// Extract the pattern from the given one and replace it with `Wild`.
+/// This is meant for temporarily swapping out the pattern for manipulation.
+fn take_pat(from: &mut Pat) -> Pat {
+ let dummy = Pat {
+ id: DUMMY_NODE_ID,
+ kind: Wild,
+ span: DUMMY_SP,
+ tokens: None,
+ };
+ mem::replace(from, dummy)
+}
+
+/// Extend `target` as an or-pattern with the alternatives
+/// in `tail_or` if there are any and return if there were.
+fn extend_with_tail_or(target: &mut Pat, tail_or: Vec<P<Pat>>) -> bool {
+ fn extend(target: &mut Pat, mut tail_or: Vec<P<Pat>>) {
+ match target {
+ // On an existing or-pattern in the target, append to it.
+ Pat { kind: Or(ps), .. } => ps.append(&mut tail_or),
+ // Otherwise convert the target to an or-pattern.
+ target => {
+ let mut init_or = vec![P(take_pat(target))];
+ init_or.append(&mut tail_or);
+ target.kind = Or(init_or);
+ },
+ }
+ }
+
+ let changed = !tail_or.is_empty();
+ if changed {
+ // Extend the target.
+ extend(target, tail_or);
+ }
+ changed
+}
+
+// Extract all inner patterns in `alternatives` matching our `predicate`.
+// Only elements beginning with `start` are considered for extraction.
+fn drain_matching(
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind) -> bool,
+ extract: impl Fn(PatKind) -> P<Pat>,
+) -> Vec<P<Pat>> {
+ let mut tail_or = vec![];
+ let mut idx = 0;
+ for pat in alternatives.drain_filter(|p| {
+ // Check if we should extract, but only if `idx >= start`.
+ idx += 1;
+ idx > start && predicate(&p.kind)
+ }) {
+ tail_or.push(extract(pat.into_inner().kind));
+ }
+ tail_or
+}
+
+fn extend_with_matching(
+ target: &mut Pat,
+ start: usize,
+ alternatives: &mut Vec<P<Pat>>,
+ predicate: impl Fn(&PatKind) -> bool,
+ extract: impl Fn(PatKind) -> P<Pat>,
+) -> bool {
+ extend_with_tail_or(target, drain_matching(start, alternatives, predicate, extract))
+}
+
+/// Are the patterns in `ps1` and `ps2` equal save for `ps1[idx]` compared to `ps2[idx]`?
+fn eq_pre_post(ps1: &[P<Pat>], ps2: &[P<Pat>], idx: usize) -> bool {
+ ps1.len() == ps2.len()
+ && ps1[idx].is_rest() == ps2[idx].is_rest() // Avoid `[x, ..] | [x, 0]` => `[x, .. | 0]`.
+ && over(&ps1[..idx], &ps2[..idx], |l, r| eq_pat(l, r))
+ && over(&ps1[idx + 1..], &ps2[idx + 1..], |l, r| eq_pat(l, r))
+}
--- /dev/null
- /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE.
+//! Read configurations files.
+
+#![allow(clippy::module_name_repetitions)]
+
+use serde::de::{Deserializer, IgnoredAny, IntoDeserializer, MapAccess, Visitor};
+use serde::Deserialize;
+use std::error::Error;
+use std::path::{Path, PathBuf};
+use std::{env, fmt, fs, io};
+
+/// Holds information used by `MISSING_ENFORCED_IMPORT_RENAMES` lint.
+#[derive(Clone, Debug, Deserialize)]
+pub struct Rename {
+ pub path: String,
+ pub rename: String,
+}
+
+/// A single disallowed method, used by the `DISALLOWED_METHODS` lint.
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DisallowedMethod {
+ Simple(String),
+ WithReason { path: String, reason: Option<String> },
+}
+
+impl DisallowedMethod {
+ pub fn path(&self) -> &str {
+ let (Self::Simple(path) | Self::WithReason { path, .. }) = self;
+
+ path
+ }
+}
+
+/// A single disallowed type, used by the `DISALLOWED_TYPES` lint.
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum DisallowedType {
+ Simple(String),
+ WithReason { path: String, reason: Option<String> },
+}
+
+/// Conf with parse errors
+#[derive(Default)]
+pub struct TryConf {
+ pub conf: Conf,
+ pub errors: Vec<String>,
+}
+
+impl TryConf {
+ fn from_error(error: impl Error) -> Self {
+ Self {
+ conf: Conf::default(),
+ errors: vec![error.to_string()],
+ }
+ }
+}
+
+macro_rules! define_Conf {
+ ($(
+ $(#[doc = $doc:literal])+
+ $(#[conf_deprecated($dep:literal)])?
+ ($name:ident: $ty:ty = $default:expr),
+ )*) => {
+ /// Clippy lint configuration
+ pub struct Conf {
+ $($(#[doc = $doc])+ pub $name: $ty,)*
+ }
+
+ mod defaults {
+ $(pub fn $name() -> $ty { $default })*
+ }
+
+ impl Default for Conf {
+ fn default() -> Self {
+ Self { $($name: defaults::$name(),)* }
+ }
+ }
+
+ impl<'de> Deserialize<'de> for TryConf {
+ fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
+ deserializer.deserialize_map(ConfVisitor)
+ }
+ }
+
+ #[derive(Deserialize)]
+ #[serde(field_identifier, rename_all = "kebab-case")]
+ #[allow(non_camel_case_types)]
+ enum Field { $($name,)* third_party, }
+
+ struct ConfVisitor;
+
+ impl<'de> Visitor<'de> for ConfVisitor {
+ type Value = TryConf;
+
+ fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
+ formatter.write_str("Conf")
+ }
+
+ fn visit_map<V>(self, mut map: V) -> Result<Self::Value, V::Error> where V: MapAccess<'de> {
+ let mut errors = Vec::new();
+ $(let mut $name = None;)*
+ // could get `Field` here directly, but get `str` first for diagnostics
+ while let Some(name) = map.next_key::<&str>()? {
+ match Field::deserialize(name.into_deserializer())? {
+ $(Field::$name => {
+ $(errors.push(format!("deprecated field `{}`. {}", name, $dep));)?
+ match map.next_value() {
+ Err(e) => errors.push(e.to_string()),
+ Ok(value) => match $name {
+ Some(_) => errors.push(format!("duplicate field `{}`", name)),
+ None => $name = Some(value),
+ }
+ }
+ })*
+ // white-listed; ignore
+ Field::third_party => drop(map.next_value::<IgnoredAny>())
+ }
+ }
+ let conf = Conf { $($name: $name.unwrap_or_else(defaults::$name),)* };
+ Ok(TryConf { conf, errors })
+ }
+ }
+
+ #[cfg(feature = "internal")]
+ pub mod metadata {
+ use crate::utils::internal_lints::metadata_collector::ClippyConfiguration;
+
+ macro_rules! wrap_option {
+ () => (None);
+ ($x:literal) => (Some($x));
+ }
+
+ pub(crate) fn get_configuration_metadata() -> Vec<ClippyConfiguration> {
+ vec![
+ $(
+ {
+ let deprecation_reason = wrap_option!($($dep)?);
+
+ ClippyConfiguration::new(
+ stringify!($name),
+ stringify!($ty),
+ format!("{:?}", super::defaults::$name()),
+ concat!($($doc, '\n',)*),
+ deprecation_reason,
+ )
+ },
+ )+
+ ]
+ }
+ }
+ };
+}
+
+define_Conf! {
+ /// Lint: ENUM_VARIANT_NAMES, LARGE_TYPES_PASSED_BY_VALUE, TRIVIALLY_COPY_PASS_BY_REF, UNNECESSARY_WRAPS, UPPER_CASE_ACRONYMS, WRONG_SELF_CONVENTION, BOX_COLLECTION, REDUNDANT_ALLOCATION, RC_BUFFER, VEC_BOX, OPTION_OPTION, LINKEDLIST, RC_MUTEX.
+ ///
+ /// Suppress lints whenever the suggested change would cause breakage for other crates.
+ (avoid_breaking_exported_api: bool = true),
++ /// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS.
+ ///
+ /// The minimum rust version that the project supports
+ (msrv: Option<String> = None),
+ /// Lint: BLACKLISTED_NAME.
+ ///
+ /// The list of blacklisted names to lint about. NB: `bar` is not here since it has legitimate uses
+ (blacklisted_names: Vec<String> = ["foo", "baz", "quux"].iter().map(ToString::to_string).collect()),
+ /// Lint: COGNITIVE_COMPLEXITY.
+ ///
+ /// The maximum cognitive complexity a function can have
+ (cognitive_complexity_threshold: u64 = 25),
+ /// DEPRECATED LINT: CYCLOMATIC_COMPLEXITY.
+ ///
+ /// Use the Cognitive Complexity lint instead.
+ #[conf_deprecated("Please use `cognitive-complexity-threshold` instead")]
+ (cyclomatic_complexity_threshold: Option<u64> = None),
+ /// Lint: DOC_MARKDOWN.
+ ///
+ /// The list of words this lint should not consider as identifiers needing ticks
+ (doc_valid_idents: Vec<String> = [
+ "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
+ "DirectX",
+ "ECMAScript",
+ "GPLv2", "GPLv3",
+ "GitHub", "GitLab",
+ "IPv4", "IPv6",
+ "ClojureScript", "CoffeeScript", "JavaScript", "PureScript", "TypeScript",
+ "NaN", "NaNs",
+ "OAuth", "GraphQL",
+ "OCaml",
+ "OpenGL", "OpenMP", "OpenSSH", "OpenSSL", "OpenStreetMap", "OpenDNS",
+ "WebGL",
+ "TensorFlow",
+ "TrueType",
+ "iOS", "macOS", "FreeBSD",
+ "TeX", "LaTeX", "BibTeX", "BibLaTeX",
+ "MinGW",
+ "CamelCase",
+ ].iter().map(ToString::to_string).collect()),
+ /// Lint: TOO_MANY_ARGUMENTS.
+ ///
+ /// The maximum number of argument a function or method can have
+ (too_many_arguments_threshold: u64 = 7),
+ /// Lint: TYPE_COMPLEXITY.
+ ///
+ /// The maximum complexity a type can have
+ (type_complexity_threshold: u64 = 250),
+ /// Lint: MANY_SINGLE_CHAR_NAMES.
+ ///
+ /// The maximum number of single char bindings a scope may have
+ (single_char_binding_names_threshold: u64 = 4),
+ /// Lint: BOXED_LOCAL, USELESS_VEC.
+ ///
+ /// The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
+ (too_large_for_stack: u64 = 200),
+ /// Lint: ENUM_VARIANT_NAMES.
+ ///
+ /// The minimum number of enum variants for the lints about variant names to trigger
+ (enum_variant_name_threshold: u64 = 3),
+ /// Lint: LARGE_ENUM_VARIANT.
+ ///
+ /// The maximum size of an enum's variant to avoid box suggestion
+ (enum_variant_size_threshold: u64 = 200),
+ /// Lint: VERBOSE_BIT_MASK.
+ ///
+ /// The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
+ (verbose_bit_mask_threshold: u64 = 1),
+ /// Lint: DECIMAL_LITERAL_REPRESENTATION.
+ ///
+ /// The lower bound for linting decimal literals
+ (literal_representation_threshold: u64 = 16384),
+ /// Lint: TRIVIALLY_COPY_PASS_BY_REF.
+ ///
+ /// The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
+ (trivial_copy_size_limit: Option<u64> = None),
+ /// Lint: LARGE_TYPE_PASS_BY_MOVE.
+ ///
+ /// The minimum size (in bytes) to consider a type for passing by reference instead of by value.
+ (pass_by_value_size_limit: u64 = 256),
+ /// Lint: TOO_MANY_LINES.
+ ///
+ /// The maximum number of lines a function or method can have
+ (too_many_lines_threshold: u64 = 100),
+ /// Lint: LARGE_STACK_ARRAYS, LARGE_CONST_ARRAYS.
+ ///
+ /// The maximum allowed size for arrays on the stack
+ (array_size_threshold: u64 = 512_000),
+ /// Lint: VEC_BOX.
+ ///
+ /// The size of the boxed type in bytes, where boxing in a `Vec` is allowed
+ (vec_box_size_threshold: u64 = 4096),
+ /// Lint: TYPE_REPETITION_IN_BOUNDS.
+ ///
+ /// The maximum number of bounds a trait can have to be linted
+ (max_trait_bounds: u64 = 3),
+ /// Lint: STRUCT_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool fields a struct can have
+ (max_struct_bools: u64 = 3),
+ /// Lint: FN_PARAMS_EXCESSIVE_BOOLS.
+ ///
+ /// The maximum number of bool parameters a function can have
+ (max_fn_params_bools: u64 = 3),
+ /// Lint: WILDCARD_IMPORTS.
+ ///
+ /// Whether to allow certain wildcard imports (prelude, super in tests).
+ (warn_on_all_wildcard_imports: bool = false),
+ /// Lint: DISALLOWED_METHODS.
+ ///
+ /// The list of disallowed methods, written as fully qualified paths.
+ (disallowed_methods: Vec<crate::utils::conf::DisallowedMethod> = Vec::new()),
+ /// Lint: DISALLOWED_TYPES.
+ ///
+ /// The list of disallowed types, written as fully qualified paths.
+ (disallowed_types: Vec<crate::utils::conf::DisallowedType> = Vec::new()),
+ /// Lint: UNREADABLE_LITERAL.
+ ///
+ /// Should the fraction of a decimal be linted to include separators.
+ (unreadable_literal_lint_fractions: bool = true),
+ /// Lint: UPPER_CASE_ACRONYMS.
+ ///
+ /// Enables verbose mode. Triggers if there is more than one uppercase char next to each other
+ (upper_case_acronyms_aggressive: bool = false),
+ /// Lint: _CARGO_COMMON_METADATA.
+ ///
+ /// For internal testing only, ignores the current `publish` settings in the Cargo manifest.
+ (cargo_ignore_publish: bool = false),
+ /// Lint: NONSTANDARD_MACRO_BRACES.
+ ///
+ /// Enforce the named macros always use the braces specified.
+ ///
+ /// A `MacroMatcher` can be added like so `{ name = "macro_name", brace = "(" }`. If the macro
+ /// is could be used with a full path two `MacroMatcher`s have to be added one with the full path
+ /// `crate_name::macro_name` and one with just the macro name.
+ (standard_macro_braces: Vec<crate::nonstandard_macro_braces::MacroMatcher> = Vec::new()),
+ /// Lint: MISSING_ENFORCED_IMPORT_RENAMES.
+ ///
+ /// The list of imports to always rename, a fully qualified path followed by the rename.
+ (enforced_import_renames: Vec<crate::utils::conf::Rename> = Vec::new()),
+ /// Lint: DISALLOWED_SCRIPT_IDENTS.
+ ///
+ /// The list of unicode scripts allowed to be used in the scope.
+ (allowed_scripts: Vec<String> = ["Latin"].iter().map(ToString::to_string).collect()),
+ /// Lint: NON_SEND_FIELDS_IN_SEND_TY.
+ ///
+ /// Whether to apply the raw pointer heuristic to determine if a type is `Send`.
+ (enable_raw_pointer_heuristic_for_send: bool = true),
+ /// Lint: INDEX_REFUTABLE_SLICE.
+ ///
+ /// When Clippy suggests using a slice pattern, this is the maximum number of elements allowed in
+ /// the slice pattern that is suggested. If more elements would be necessary, the lint is suppressed.
+ /// For example, `[_, _, _, e, ..]` is a slice pattern with 4 elements.
+ (max_suggested_slice_pattern_length: u64 = 3),
+}
+
+/// Search for the configuration file.
+pub fn lookup_conf_file() -> io::Result<Option<PathBuf>> {
+ /// Possible filename to search for.
+ const CONFIG_FILE_NAMES: [&str; 2] = [".clippy.toml", "clippy.toml"];
+
+ // Start looking for a config file in CLIPPY_CONF_DIR, or failing that, CARGO_MANIFEST_DIR.
+ // If neither of those exist, use ".".
+ let mut current = env::var_os("CLIPPY_CONF_DIR")
+ .or_else(|| env::var_os("CARGO_MANIFEST_DIR"))
+ .map_or_else(|| PathBuf::from("."), PathBuf::from);
+ loop {
+ for config_file_name in &CONFIG_FILE_NAMES {
+ if let Ok(config_file) = current.join(config_file_name).canonicalize() {
+ match fs::metadata(&config_file) {
+ Err(e) if e.kind() == io::ErrorKind::NotFound => {},
+ Err(e) => return Err(e),
+ Ok(md) if md.is_dir() => {},
+ Ok(_) => return Ok(Some(config_file)),
+ }
+ }
+ }
+
+ // If the current directory has no parent, we're done searching.
+ if !current.pop() {
+ return Ok(None);
+ }
+ }
+}
+
+/// Read the `toml` configuration file.
+///
+/// In case of error, the function tries to continue as much as possible.
+pub fn read(path: &Path) -> TryConf {
+ let content = match fs::read_to_string(path) {
+ Err(e) => return TryConf::from_error(e),
+ Ok(content) => content,
+ };
+ toml::from_str(&content).unwrap_or_else(TryConf::from_error)
+}
--- /dev/null
+use clippy_utils::consts::{constant_simple, Constant};
+use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
+use clippy_utils::macros::root_macro_call_first_node;
+use clippy_utils::source::snippet;
+use clippy_utils::ty::match_type;
+use clippy_utils::{
+ higher, is_else_clause, is_expn_of, is_expr_path_def_path, is_lint_allowed, match_def_path, method_calls,
+ path_to_res, paths, peel_blocks_with_stmt, SpanlessEq,
+};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_ast::ast::{Crate, ItemKind, LitKind, ModKind, NodeId};
+use rustc_ast::visit::FnKind;
+use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::DefId;
+use rustc_hir::hir_id::CRATE_HIR_ID;
+use rustc_hir::intravisit::Visitor;
+use rustc_hir::{
+ BinOpKind, Block, Expr, ExprKind, HirId, Item, Local, MutTy, Mutability, Node, Path, Stmt, StmtKind, Ty, TyKind,
+ UnOp,
+};
+use rustc_lint::{EarlyContext, EarlyLintPass, LateContext, LateLintPass, LintContext};
++use rustc_middle::hir::nested_filter;
+use rustc_middle::mir::interpret::ConstValue;
+use rustc_middle::ty;
+use rustc_semver::RustcVersion;
+use rustc_session::{declare_lint_pass, declare_tool_lint, impl_lint_pass};
+use rustc_span::source_map::Spanned;
+use rustc_span::symbol::Symbol;
+use rustc_span::{sym, BytePos, Span};
+use rustc_typeck::hir_ty_to_ty;
+
+use std::borrow::{Borrow, Cow};
+
+#[cfg(feature = "internal")]
+pub mod metadata_collector;
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for various things we like to keep tidy in clippy.
+ ///
+ /// ### Why is this bad?
+ /// We like to pretend we're an example of tidy code.
+ ///
+ /// ### Example
+ /// Wrong ordering of the util::paths constants.
+ pub CLIPPY_LINTS_INTERNAL,
+ internal,
+ "various things that will negatively affect your clippy experience"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Ensures every lint is associated to a `LintPass`.
+ ///
+ /// ### Why is this bad?
+ /// The compiler only knows lints via a `LintPass`. Without
+ /// putting a lint to a `LintPass::get_lints()`'s return, the compiler will not
+ /// know the name of the lint.
+ ///
+ /// ### Known problems
+ /// Only checks for lints associated using the
+ /// `declare_lint_pass!`, `impl_lint_pass!`, and `lint_array!` macros.
+ ///
+ /// ### Example
+ /// ```rust,ignore
+ /// declare_lint! { pub LINT_1, ... }
+ /// declare_lint! { pub LINT_2, ... }
+ /// declare_lint! { pub FORGOTTEN_LINT, ... }
+ /// // ...
+ /// declare_lint_pass!(Pass => [LINT_1, LINT_2]);
+ /// // missing FORGOTTEN_LINT
+ /// ```
+ pub LINT_WITHOUT_LINT_PASS,
+ internal,
+ "declaring a lint without associating it in a LintPass"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `cx.span_lint*` and suggests to use the `utils::*`
+ /// variant of the function.
+ ///
+ /// ### Why is this bad?
+ /// The `utils::*` variants also add a link to the Clippy documentation to the
+ /// warning/error messages.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// cx.span_lint(LINT_NAME, "message");
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// utils::span_lint(cx, LINT_NAME, "message");
+ /// ```
+ pub COMPILER_LINT_FUNCTIONS,
+ internal,
+ "usage of the lint functions of the compiler instead of the utils::* variant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `cx.outer().expn_data()` and suggests to use
+ /// the `cx.outer_expn_data()`
+ ///
+ /// ### Why is this bad?
+ /// `cx.outer_expn_data()` is faster and more concise.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// expr.span.ctxt().outer().expn_data()
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// expr.span.ctxt().outer_expn_data()
+ /// ```
+ pub OUTER_EXPN_EXPN_DATA,
+ internal,
+ "using `cx.outer_expn().expn_data()` instead of `cx.outer_expn_data()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Not an actual lint. This lint is only meant for testing our customized internal compiler
+ /// error message by calling `panic`.
+ ///
+ /// ### Why is this bad?
+ /// ICE in large quantities can damage your teeth
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// 🍦🍦🍦🍦🍦
+ /// ```
+ pub PRODUCE_ICE,
+ internal,
+ "this message should not appear anywhere as we ICE before and don't emit the lint"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for cases of an auto-generated lint without an updated description,
+ /// i.e. `default lint description`.
+ ///
+ /// ### Why is this bad?
+ /// Indicates that the lint is not finished.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// declare_lint! { pub COOL_LINT, nursery, "default lint description" }
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// declare_lint! { pub COOL_LINT, nursery, "a great new lint" }
+ /// ```
+ pub DEFAULT_LINT,
+ internal,
+ "found 'default lint description' in a lint declaration"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Lints `span_lint_and_then` function calls, where the
+ /// closure argument has only one statement and that statement is a method
+ /// call to `span_suggestion`, `span_help`, `span_note` (using the same
+ /// span), `help` or `note`.
+ ///
+ /// These usages of `span_lint_and_then` should be replaced with one of the
+ /// wrapper functions `span_lint_and_sugg`, span_lint_and_help`, or
+ /// `span_lint_and_note`.
+ ///
+ /// ### Why is this bad?
+ /// Using the wrapper `span_lint_and_*` functions, is more
+ /// convenient, readable and less error prone.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_suggestion(
+ /// expr.span,
+ /// help_msg,
+ /// sugg.to_string(),
+ /// Applicability::MachineApplicable,
+ /// );
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_help(expr.span, help_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.help(help_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.span_note(expr.span, note_msg);
+ /// });
+ /// span_lint_and_then(cx, TEST_LINT, expr.span, lint_msg, |diag| {
+ /// diag.note(note_msg);
+ /// });
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// TEST_LINT,
+ /// expr.span,
+ /// lint_msg,
+ /// help_msg,
+ /// sugg.to_string(),
+ /// Applicability::MachineApplicable,
+ /// );
+ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), help_msg);
+ /// span_lint_and_help(cx, TEST_LINT, expr.span, lint_msg, None, help_msg);
+ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, Some(expr.span), note_msg);
+ /// span_lint_and_note(cx, TEST_LINT, expr.span, lint_msg, None, note_msg);
+ /// ```
+ pub COLLAPSIBLE_SPAN_LINT_CALLS,
+ internal,
+ "found collapsible `span_lint_and_then` calls"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for calls to `utils::match_type()` on a type diagnostic item
+ /// and suggests to use `utils::is_type_diagnostic_item()` instead.
+ ///
+ /// ### Why is this bad?
+ /// `utils::is_type_diagnostic_item()` does not require hardcoded paths.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// utils::match_type(cx, ty, &paths::VEC)
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// utils::is_type_diagnostic_item(cx, ty, sym::Vec)
+ /// ```
+ pub MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ internal,
+ "using `utils::match_type()` instead of `utils::is_type_diagnostic_item()`"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks the paths module for invalid paths.
+ ///
+ /// ### Why is this bad?
+ /// It indicates a bug in the code.
+ ///
+ /// ### Example
+ /// None.
+ pub INVALID_PATHS,
+ internal,
+ "invalid path"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for interning symbols that have already been pre-interned and defined as constants.
+ ///
+ /// ### Why is this bad?
+ /// It's faster and easier to use the symbol constant.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// let _ = sym!(f32);
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// let _ = sym::f32;
+ /// ```
+ pub INTERNING_DEFINED_SYMBOL,
+ internal,
+ "interning a symbol that is pre-interned and defined as a constant"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for unnecessary conversion from Symbol to a string.
+ ///
+ /// ### Why is this bad?
+ /// It's faster use symbols directly intead of strings.
+ ///
+ /// ### Example
+ /// Bad:
+ /// ```rust,ignore
+ /// symbol.as_str() == "clippy";
+ /// ```
+ ///
+ /// Good:
+ /// ```rust,ignore
+ /// symbol == sym::clippy;
+ /// ```
+ pub UNNECESSARY_SYMBOL_STR,
+ internal,
+ "unnecessary conversion between Symbol and string"
+}
+
+declare_clippy_lint! {
+ /// Finds unidiomatic usage of `if_chain!`
+ pub IF_CHAIN_STYLE,
+ internal,
+ "non-idiomatic `if_chain!` usage"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for invalid `clippy::version` attributes.
+ ///
+ /// Valid values are:
+ /// * "pre 1.29.0"
+ /// * any valid semantic version
+ pub INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ internal,
+ "found an invalid `clippy::version` attribute"
+}
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Checks for declared clippy lints without the `clippy::version` attribute.
+ ///
+ pub MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ internal,
+ "found clippy lint without `clippy::version` attribute"
+}
+
+declare_lint_pass!(ClippyLintsInternal => [CLIPPY_LINTS_INTERNAL]);
+
+impl EarlyLintPass for ClippyLintsInternal {
+ fn check_crate(&mut self, cx: &EarlyContext<'_>, krate: &Crate) {
+ if let Some(utils) = krate.items.iter().find(|item| item.ident.name.as_str() == "utils") {
+ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = utils.kind {
+ if let Some(paths) = items.iter().find(|item| item.ident.name.as_str() == "paths") {
+ if let ItemKind::Mod(_, ModKind::Loaded(ref items, ..)) = paths.kind {
+ let mut last_name: Option<&str> = None;
+ for item in items {
+ let name = item.ident.as_str();
+ if let Some(last_name) = last_name {
+ if *last_name > *name {
+ span_lint(
+ cx,
+ CLIPPY_LINTS_INTERNAL,
+ item.span,
+ "this constant should be before the previous constant due to lexical \
+ ordering",
+ );
+ }
+ }
+ last_name = Some(name);
+ }
+ }
+ }
+ }
+ }
+ }
+}
+
+#[derive(Clone, Debug, Default)]
+pub struct LintWithoutLintPass {
+ declared_lints: FxHashMap<Symbol, Span>,
+ registered_lints: FxHashSet<Symbol>,
+}
+
+impl_lint_pass!(LintWithoutLintPass => [DEFAULT_LINT, LINT_WITHOUT_LINT_PASS, INVALID_CLIPPY_VERSION_ATTRIBUTE, MISSING_CLIPPY_VERSION_ATTRIBUTE]);
+
+impl<'tcx> LateLintPass<'tcx> for LintWithoutLintPass {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ if is_lint_allowed(cx, DEFAULT_LINT, item.hir_id()) {
+ return;
+ }
+
+ if let hir::ItemKind::Static(ty, Mutability::Not, body_id) = item.kind {
+ if is_lint_ref_type(cx, ty) {
+ check_invalid_clippy_version_attribute(cx, item);
+
+ let expr = &cx.tcx.hir().body(body_id).value;
+ if_chain! {
+ if let ExprKind::AddrOf(_, _, inner_exp) = expr.kind;
+ if let ExprKind::Struct(_, fields, _) = inner_exp.kind;
+ let field = fields
+ .iter()
+ .find(|f| f.ident.as_str() == "desc")
+ .expect("lints must have a description field");
+ if let ExprKind::Lit(Spanned {
+ node: LitKind::Str(ref sym, _),
+ ..
+ }) = field.expr.kind;
+ if sym.as_str() == "default lint description";
+
+ then {
+ span_lint(
+ cx,
+ DEFAULT_LINT,
+ item.span,
+ &format!("the lint `{}` has the default lint description", item.ident.name),
+ );
+ }
+ }
+ self.declared_lints.insert(item.ident.name, item.span);
+ }
+ } else if let Some(macro_call) = root_macro_call_first_node(cx, item) {
+ if !matches!(
+ &*cx.tcx.item_name(macro_call.def_id).as_str(),
+ "impl_lint_pass" | "declare_lint_pass"
+ ) {
+ return;
+ }
+ if let hir::ItemKind::Impl(hir::Impl {
+ of_trait: None,
+ items: impl_item_refs,
+ ..
+ }) = item.kind
+ {
+ let mut collector = LintCollector {
+ output: &mut self.registered_lints,
+ cx,
+ };
+ let body_id = cx.tcx.hir().body_owned_by(
+ impl_item_refs
+ .iter()
+ .find(|iiref| iiref.ident.as_str() == "get_lints")
+ .expect("LintPass needs to implement get_lints")
+ .id
+ .hir_id(),
+ );
+ collector.visit_expr(&cx.tcx.hir().body(body_id).value);
+ }
+ }
+ }
+
+ fn check_crate_post(&mut self, cx: &LateContext<'tcx>) {
+ if is_lint_allowed(cx, LINT_WITHOUT_LINT_PASS, CRATE_HIR_ID) {
+ return;
+ }
+
+ for (lint_name, &lint_span) in &self.declared_lints {
+ // When using the `declare_tool_lint!` macro, the original `lint_span`'s
+ // file points to "<rustc macros>".
+ // `compiletest-rs` thinks that's an error in a different file and
+ // just ignores it. This causes the test in compile-fail/lint_pass
+ // not able to capture the error.
+ // Therefore, we need to climb the macro expansion tree and find the
+ // actual span that invoked `declare_tool_lint!`:
+ let lint_span = lint_span.ctxt().outer_expn_data().call_site;
+
+ if !self.registered_lints.contains(lint_name) {
+ span_lint(
+ cx,
+ LINT_WITHOUT_LINT_PASS,
+ lint_span,
+ &format!("the lint `{}` is not added to any `LintPass`", lint_name),
+ );
+ }
+ }
+ }
+}
+
+fn is_lint_ref_type<'tcx>(cx: &LateContext<'tcx>, ty: &Ty<'_>) -> bool {
+ if let TyKind::Rptr(
+ _,
+ MutTy {
+ ty: inner,
+ mutbl: Mutability::Not,
+ },
+ ) = ty.kind
+ {
+ if let TyKind::Path(ref path) = inner.kind {
+ if let Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, inner.hir_id) {
+ return match_def_path(cx, def_id, &paths::LINT);
+ }
+ }
+ }
+
+ false
+}
+
+fn check_invalid_clippy_version_attribute(cx: &LateContext<'_>, item: &'_ Item<'_>) {
+ if let Some(value) = extract_clippy_version_value(cx, item) {
+ // The `sym!` macro doesn't work as it only expects a single token.
+ // It's better to keep it this way and have a direct `Symbol::intern` call here.
+ if value == Symbol::intern("pre 1.29.0") {
+ return;
+ }
+
+ if RustcVersion::parse(&*value.as_str()).is_err() {
+ span_lint_and_help(
+ cx,
+ INVALID_CLIPPY_VERSION_ATTRIBUTE,
+ item.span,
+ "this item has an invalid `clippy::version` attribute",
+ None,
+ "please use a valid sematic version, see `doc/adding_lints.md`",
+ );
+ }
+ } else {
+ span_lint_and_help(
+ cx,
+ MISSING_CLIPPY_VERSION_ATTRIBUTE,
+ item.span,
+ "this lint is missing the `clippy::version` attribute or version value",
+ None,
+ "please use a `clippy::version` attribute, see `doc/adding_lints.md`",
+ );
+ }
+}
+
+/// This function extracts the version value of a `clippy::version` attribute if the given value has
+/// one
+fn extract_clippy_version_value(cx: &LateContext<'_>, item: &'_ Item<'_>) -> Option<Symbol> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ attrs.iter().find_map(|attr| {
+ if_chain! {
+ // Identify attribute
+ if let ast::AttrKind::Normal(ref attr_kind, _) = &attr.kind;
+ if let [tool_name, attr_name] = &attr_kind.path.segments[..];
+ if tool_name.ident.name == sym::clippy;
+ if attr_name.ident.name == sym::version;
+ if let Some(version) = attr.value_str();
+ then {
+ Some(version)
+ } else {
+ None
+ }
+ }
+ })
+}
+
+struct LintCollector<'a, 'tcx> {
+ output: &'a mut FxHashSet<Symbol>,
+ cx: &'a LateContext<'tcx>,
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for LintCollector<'a, 'tcx> {
+ type NestedFilter = nested_filter::All;
+
+ fn visit_path(&mut self, path: &'tcx Path<'_>, _: HirId) {
+ if path.segments.len() == 1 {
+ self.output.insert(path.segments[0].ident.name);
+ }
+ }
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+}
+
+#[derive(Clone, Default)]
+pub struct CompilerLintFunctions {
+ map: FxHashMap<&'static str, &'static str>,
+}
+
+impl CompilerLintFunctions {
+ #[must_use]
+ pub fn new() -> Self {
+ let mut map = FxHashMap::default();
+ map.insert("span_lint", "utils::span_lint");
+ map.insert("struct_span_lint", "utils::span_lint");
+ map.insert("lint", "utils::span_lint");
+ map.insert("span_lint_note", "utils::span_lint_and_note");
+ map.insert("span_lint_help", "utils::span_lint_and_help");
+ Self { map }
+ }
+}
+
+impl_lint_pass!(CompilerLintFunctions => [COMPILER_LINT_FUNCTIONS]);
+
+impl<'tcx> LateLintPass<'tcx> for CompilerLintFunctions {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if is_lint_allowed(cx, COMPILER_LINT_FUNCTIONS, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::MethodCall(path, [self_arg, ..], _) = &expr.kind;
+ let fn_name = path.ident;
+ if let Some(sugg) = self.map.get(&*fn_name.as_str());
+ let ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
+ if match_type(cx, ty, &paths::EARLY_CONTEXT)
+ || match_type(cx, ty, &paths::LATE_CONTEXT);
+ then {
+ span_lint_and_help(
+ cx,
+ COMPILER_LINT_FUNCTIONS,
+ path.ident.span,
+ "usage of a compiler lint function",
+ None,
+ &format!("please use the Clippy variant of this function: `{}`", sugg),
+ );
+ }
+ }
+ }
+}
+
+declare_lint_pass!(OuterExpnDataPass => [OUTER_EXPN_EXPN_DATA]);
+
+impl<'tcx> LateLintPass<'tcx> for OuterExpnDataPass {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, OUTER_EXPN_EXPN_DATA, expr.hir_id) {
+ return;
+ }
+
+ let (method_names, arg_lists, spans) = method_calls(expr, 2);
+ let method_names: Vec<&str> = method_names.iter().map(Symbol::as_str).collect();
+ if_chain! {
+ if let ["expn_data", "outer_expn"] = method_names.as_slice();
+ let args = arg_lists[1];
+ if args.len() == 1;
+ let self_arg = &args[0];
+ let self_ty = cx.typeck_results().expr_ty(self_arg).peel_refs();
+ if match_type(cx, self_ty, &paths::SYNTAX_CONTEXT);
+ then {
+ span_lint_and_sugg(
+ cx,
+ OUTER_EXPN_EXPN_DATA,
+ spans[1].with_hi(expr.span.hi()),
+ "usage of `outer_expn().expn_data()`",
+ "try",
+ "outer_expn_data()".to_string(),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ }
+}
+
+declare_lint_pass!(ProduceIce => [PRODUCE_ICE]);
+
+impl EarlyLintPass for ProduceIce {
+ fn check_fn(&mut self, _: &EarlyContext<'_>, fn_kind: FnKind<'_>, _: Span, _: NodeId) {
+ assert!(!is_trigger_fn(fn_kind), "Would you like some help with that?");
+ }
+}
+
+fn is_trigger_fn(fn_kind: FnKind<'_>) -> bool {
+ match fn_kind {
+ FnKind::Fn(_, ident, ..) => ident.name.as_str() == "it_looks_like_you_are_trying_to_kill_clippy",
+ FnKind::Closure(..) => false,
+ }
+}
+
+declare_lint_pass!(CollapsibleCalls => [COLLAPSIBLE_SPAN_LINT_CALLS]);
+
+impl<'tcx> LateLintPass<'tcx> for CollapsibleCalls {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, COLLAPSIBLE_SPAN_LINT_CALLS, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ if let ExprKind::Call(func, and_then_args) = expr.kind;
+ if is_expr_path_def_path(cx, func, &["clippy_utils", "diagnostics", "span_lint_and_then"]);
+ if and_then_args.len() == 5;
+ if let ExprKind::Closure(_, _, body_id, _, _) = &and_then_args[4].kind;
+ let body = cx.tcx.hir().body(*body_id);
+ let only_expr = peel_blocks_with_stmt(&body.value);
+ if let ExprKind::MethodCall(ps, span_call_args, _) = &only_expr.kind;
+ then {
+ let and_then_snippets = get_and_then_snippets(cx, and_then_args);
+ let mut sle = SpanlessEq::new(cx).deny_side_effects();
+ match &*ps.ident.as_str() {
+ "span_suggestion" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ suggest_suggestion(cx, expr, &and_then_snippets, &span_suggestion_snippets(cx, span_call_args));
+ },
+ "span_help" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ let help_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), true);
+ },
+ "span_note" if sle.eq_expr(&and_then_args[2], &span_call_args[1]) => {
+ let note_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), true);
+ },
+ "help" => {
+ let help_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
+ suggest_help(cx, expr, &and_then_snippets, help_snippet.borrow(), false);
+ }
+ "note" => {
+ let note_snippet = snippet(cx, span_call_args[1].span, r#""...""#);
+ suggest_note(cx, expr, &and_then_snippets, note_snippet.borrow(), false);
+ }
+ _ => (),
+ }
+ }
+ }
+ }
+}
+
+struct AndThenSnippets<'a> {
+ cx: Cow<'a, str>,
+ lint: Cow<'a, str>,
+ span: Cow<'a, str>,
+ msg: Cow<'a, str>,
+}
+
+fn get_and_then_snippets<'a, 'hir>(cx: &LateContext<'_>, and_then_snippets: &'hir [Expr<'hir>]) -> AndThenSnippets<'a> {
+ let cx_snippet = snippet(cx, and_then_snippets[0].span, "cx");
+ let lint_snippet = snippet(cx, and_then_snippets[1].span, "..");
+ let span_snippet = snippet(cx, and_then_snippets[2].span, "span");
+ let msg_snippet = snippet(cx, and_then_snippets[3].span, r#""...""#);
+
+ AndThenSnippets {
+ cx: cx_snippet,
+ lint: lint_snippet,
+ span: span_snippet,
+ msg: msg_snippet,
+ }
+}
+
+struct SpanSuggestionSnippets<'a> {
+ help: Cow<'a, str>,
+ sugg: Cow<'a, str>,
+ applicability: Cow<'a, str>,
+}
+
+fn span_suggestion_snippets<'a, 'hir>(
+ cx: &LateContext<'_>,
+ span_call_args: &'hir [Expr<'hir>],
+) -> SpanSuggestionSnippets<'a> {
+ let help_snippet = snippet(cx, span_call_args[2].span, r#""...""#);
+ let sugg_snippet = snippet(cx, span_call_args[3].span, "..");
+ let applicability_snippet = snippet(cx, span_call_args[4].span, "Applicability::MachineApplicable");
+
+ SpanSuggestionSnippets {
+ help: help_snippet,
+ sugg: sugg_snippet,
+ applicability: applicability_snippet,
+ }
+}
+
+fn suggest_suggestion(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ span_suggestion_snippets: &SpanSuggestionSnippets<'_>,
+) {
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collapsible",
+ "collapse into",
+ format!(
+ "span_lint_and_sugg({}, {}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ span_suggestion_snippets.help,
+ span_suggestion_snippets.sugg,
+ span_suggestion_snippets.applicability
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+fn suggest_help(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ help: &str,
+ with_span: bool,
+) {
+ let option_span = if with_span {
+ format!("Some({})", and_then_snippets.span)
+ } else {
+ "None".to_string()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collapsible",
+ "collapse into",
+ format!(
+ "span_lint_and_help({}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ &option_span,
+ help
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+fn suggest_note(
+ cx: &LateContext<'_>,
+ expr: &Expr<'_>,
+ and_then_snippets: &AndThenSnippets<'_>,
+ note: &str,
+ with_span: bool,
+) {
+ let note_span = if with_span {
+ format!("Some({})", and_then_snippets.span)
+ } else {
+ "None".to_string()
+ };
+
+ span_lint_and_sugg(
+ cx,
+ COLLAPSIBLE_SPAN_LINT_CALLS,
+ expr.span,
+ "this call is collspible",
+ "collapse into",
+ format!(
+ "span_lint_and_note({}, {}, {}, {}, {}, {})",
+ and_then_snippets.cx,
+ and_then_snippets.lint,
+ and_then_snippets.span,
+ and_then_snippets.msg,
+ note_span,
+ note
+ ),
+ Applicability::MachineApplicable,
+ );
+}
+
+declare_lint_pass!(MatchTypeOnDiagItem => [MATCH_TYPE_ON_DIAGNOSTIC_ITEM]);
+
+impl<'tcx> LateLintPass<'tcx> for MatchTypeOnDiagItem {
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ if is_lint_allowed(cx, MATCH_TYPE_ON_DIAGNOSTIC_ITEM, expr.hir_id) {
+ return;
+ }
+
+ if_chain! {
+ // Check if this is a call to utils::match_type()
+ if let ExprKind::Call(fn_path, [context, ty, ty_path]) = expr.kind;
+ if is_expr_path_def_path(cx, fn_path, &["clippy_utils", "ty", "match_type"]);
+ // Extract the path to the matched type
+ if let Some(segments) = path_to_matched_type(cx, ty_path);
+ let segments: Vec<&str> = segments.iter().map(Symbol::as_str).collect();
+ if let Some(ty_did) = path_to_res(cx, &segments[..]).opt_def_id();
+ // Check if the matched type is a diagnostic item
+ if let Some(item_name) = cx.tcx.get_diagnostic_name(ty_did);
+ then {
+ // TODO: check paths constants from external crates.
+ let cx_snippet = snippet(cx, context.span, "_");
+ let ty_snippet = snippet(cx, ty.span, "_");
+
+ span_lint_and_sugg(
+ cx,
+ MATCH_TYPE_ON_DIAGNOSTIC_ITEM,
+ expr.span,
+ "usage of `clippy_utils::ty::match_type()` on a type diagnostic item",
+ "try",
+ format!("clippy_utils::ty::is_type_diagnostic_item({}, {}, sym::{})", cx_snippet, ty_snippet, item_name),
+ Applicability::MaybeIncorrect,
+ );
+ }
+ }
+ }
+}
+
+fn path_to_matched_type(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Vec<Symbol>> {
+ use rustc_hir::ItemKind;
+
+ match &expr.kind {
+ ExprKind::AddrOf(.., expr) => return path_to_matched_type(cx, expr),
+ ExprKind::Path(qpath) => match cx.qpath_res(qpath, expr.hir_id) {
+ Res::Local(hir_id) => {
+ let parent_id = cx.tcx.hir().get_parent_node(hir_id);
+ if let Some(Node::Local(local)) = cx.tcx.hir().find(parent_id) {
+ if let Some(init) = local.init {
+ return path_to_matched_type(cx, init);
+ }
+ }
+ },
+ Res::Def(DefKind::Const | DefKind::Static, def_id) => {
+ if let Some(Node::Item(item)) = cx.tcx.hir().get_if_local(def_id) {
+ if let ItemKind::Const(.., body_id) | ItemKind::Static(.., body_id) = item.kind {
+ let body = cx.tcx.hir().body(body_id);
+ return path_to_matched_type(cx, &body.value);
+ }
+ }
+ },
+ _ => {},
+ },
+ ExprKind::Array(exprs) => {
+ let segments: Vec<Symbol> = exprs
+ .iter()
+ .filter_map(|expr| {
+ if let ExprKind::Lit(lit) = &expr.kind {
+ if let LitKind::Str(sym, _) = lit.node {
+ return Some(sym);
+ }
+ }
+
+ None
+ })
+ .collect();
+
+ if segments.len() == exprs.len() {
+ return Some(segments);
+ }
+ },
+ _ => {},
+ }
+
+ None
+}
+
+// This is not a complete resolver for paths. It works on all the paths currently used in the paths
+// module. That's all it does and all it needs to do.
+pub fn check_path(cx: &LateContext<'_>, path: &[&str]) -> bool {
+ if path_to_res(cx, path) != Res::Err {
+ return true;
+ }
+
+ // Some implementations can't be found by `path_to_res`, particularly inherent
+ // implementations of native types. Check lang items.
+ let path_syms: Vec<_> = path.iter().map(|p| Symbol::intern(p)).collect();
+ let lang_items = cx.tcx.lang_items();
+ for item_def_id in lang_items.items().iter().flatten() {
+ let lang_item_path = cx.get_def_path(*item_def_id);
+ if path_syms.starts_with(&lang_item_path) {
+ if let [item] = &path_syms[lang_item_path.len()..] {
+ if matches!(
+ cx.tcx.def_kind(*item_def_id),
+ DefKind::Mod | DefKind::Enum | DefKind::Trait
+ ) {
+ for child in cx.tcx.module_children(*item_def_id) {
+ if child.ident.name == *item {
+ return true;
+ }
+ }
+ } else {
+ for child in cx.tcx.associated_item_def_ids(*item_def_id) {
+ if cx.tcx.item_name(*child) == *item {
+ return true;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ false
+}
+
+declare_lint_pass!(InvalidPaths => [INVALID_PATHS]);
+
+impl<'tcx> LateLintPass<'tcx> for InvalidPaths {
+ fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
+ let local_def_id = &cx.tcx.parent_module(item.hir_id());
+ let mod_name = &cx.tcx.item_name(local_def_id.to_def_id());
+ if_chain! {
+ if mod_name.as_str() == "paths";
+ if let hir::ItemKind::Const(ty, body_id) = item.kind;
+ let ty = hir_ty_to_ty(cx.tcx, ty);
+ if let ty::Array(el_ty, _) = &ty.kind();
+ if let ty::Ref(_, el_ty, _) = &el_ty.kind();
+ if el_ty.is_str();
+ let body = cx.tcx.hir().body(body_id);
+ let typeck_results = cx.tcx.typeck_body(body_id);
+ if let Some(Constant::Vec(path)) = constant_simple(cx, typeck_results, &body.value);
+ let path: Vec<&str> = path.iter().map(|x| {
+ if let Constant::Str(s) = x {
+ s.as_str()
+ } else {
+ // We checked the type of the constant above
+ unreachable!()
+ }
+ }).collect();
+ if !check_path(cx, &path[..]);
+ then {
+ span_lint(cx, INVALID_PATHS, item.span, "invalid path");
+ }
+ }
+ }
+}
+
+#[derive(Default)]
+pub struct InterningDefinedSymbol {
+ // Maps the symbol value to the constant DefId.
+ symbol_map: FxHashMap<u32, DefId>,
+}
+
+impl_lint_pass!(InterningDefinedSymbol => [INTERNING_DEFINED_SYMBOL, UNNECESSARY_SYMBOL_STR]);
+
+impl<'tcx> LateLintPass<'tcx> for InterningDefinedSymbol {
+ fn check_crate(&mut self, cx: &LateContext<'_>) {
+ if !self.symbol_map.is_empty() {
+ return;
+ }
+
+ for &module in &[&paths::KW_MODULE, &paths::SYM_MODULE] {
+ if let Some(def_id) = path_to_res(cx, module).opt_def_id() {
+ for item in cx.tcx.module_children(def_id).iter() {
+ if_chain! {
+ if let Res::Def(DefKind::Const, item_def_id) = item.res;
+ let ty = cx.tcx.type_of(item_def_id);
+ if match_type(cx, ty, &paths::SYMBOL);
+ if let Ok(ConstValue::Scalar(value)) = cx.tcx.const_eval_poly(item_def_id);
+ if let Ok(value) = value.to_u32();
+ then {
+ self.symbol_map.insert(value, item_def_id);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
+ if_chain! {
+ if let ExprKind::Call(func, [arg]) = &expr.kind;
+ if let ty::FnDef(def_id, _) = cx.typeck_results().expr_ty(func).kind();
+ if match_def_path(cx, *def_id, &paths::SYMBOL_INTERN);
+ if let Some(Constant::Str(arg)) = constant_simple(cx, cx.typeck_results(), arg);
+ let value = Symbol::intern(&arg).as_u32();
+ if let Some(&def_id) = self.symbol_map.get(&value);
+ then {
+ span_lint_and_sugg(
+ cx,
+ INTERNING_DEFINED_SYMBOL,
+ is_expn_of(expr.span, "sym").unwrap_or(expr.span),
+ "interning a defined symbol",
+ "try",
+ cx.tcx.def_path_str(def_id),
+ Applicability::MachineApplicable,
+ );
+ }
+ }
+ if let ExprKind::Binary(op, left, right) = expr.kind {
+ if matches!(op.node, BinOpKind::Eq | BinOpKind::Ne) {
+ let data = [
+ (left, self.symbol_str_expr(left, cx)),
+ (right, self.symbol_str_expr(right, cx)),
+ ];
+ match data {
+ // both operands are a symbol string
+ [(_, Some(left)), (_, Some(right))] => {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_SYMBOL_STR,
+ expr.span,
+ "unnecessary `Symbol` to string conversion",
+ "try",
+ format!(
+ "{} {} {}",
+ left.as_symbol_snippet(cx),
+ op.node.as_str(),
+ right.as_symbol_snippet(cx),
+ ),
+ Applicability::MachineApplicable,
+ );
+ },
+ // one of the operands is a symbol string
+ [(expr, Some(symbol)), _] | [_, (expr, Some(symbol))] => {
+ // creating an owned string for comparison
+ if matches!(symbol, SymbolStrExpr::Expr { is_to_owned: true, .. }) {
+ span_lint_and_sugg(
+ cx,
+ UNNECESSARY_SYMBOL_STR,
+ expr.span,
+ "unnecessary string allocation",
+ "try",
+ format!("{}.as_str()", symbol.as_symbol_snippet(cx)),
+ Applicability::MachineApplicable,
+ );
+ }
+ },
+ // nothing found
+ [(_, None), (_, None)] => {},
+ }
+ }
+ }
+ }
+}
+
+impl InterningDefinedSymbol {
+ fn symbol_str_expr<'tcx>(&self, expr: &'tcx Expr<'tcx>, cx: &LateContext<'tcx>) -> Option<SymbolStrExpr<'tcx>> {
+ static IDENT_STR_PATHS: &[&[&str]] = &[&paths::IDENT_AS_STR, &paths::TO_STRING_METHOD];
+ static SYMBOL_STR_PATHS: &[&[&str]] = &[
+ &paths::SYMBOL_AS_STR,
+ &paths::SYMBOL_TO_IDENT_STRING,
+ &paths::TO_STRING_METHOD,
+ ];
+ let call = if_chain! {
+ if let ExprKind::AddrOf(_, _, e) = expr.kind;
+ if let ExprKind::Unary(UnOp::Deref, e) = e.kind;
+ then { e } else { expr }
+ };
+ if_chain! {
+ // is a method call
+ if let ExprKind::MethodCall(_, [item], _) = call.kind;
+ if let Some(did) = cx.typeck_results().type_dependent_def_id(call.hir_id);
+ let ty = cx.typeck_results().expr_ty(item);
+ // ...on either an Ident or a Symbol
+ if let Some(is_ident) = if match_type(cx, ty, &paths::SYMBOL) {
+ Some(false)
+ } else if match_type(cx, ty, &paths::IDENT) {
+ Some(true)
+ } else {
+ None
+ };
+ // ...which converts it to a string
+ let paths = if is_ident { IDENT_STR_PATHS } else { SYMBOL_STR_PATHS };
+ if let Some(path) = paths.iter().find(|path| match_def_path(cx, did, path));
+ then {
+ let is_to_owned = path.last().unwrap().ends_with("string");
+ return Some(SymbolStrExpr::Expr {
+ item,
+ is_ident,
+ is_to_owned,
+ });
+ }
+ }
+ // is a string constant
+ if let Some(Constant::Str(s)) = constant_simple(cx, cx.typeck_results(), expr) {
+ let value = Symbol::intern(&s).as_u32();
+ // ...which matches a symbol constant
+ if let Some(&def_id) = self.symbol_map.get(&value) {
+ return Some(SymbolStrExpr::Const(def_id));
+ }
+ }
+ None
+ }
+}
+
+enum SymbolStrExpr<'tcx> {
+ /// a string constant with a corresponding symbol constant
+ Const(DefId),
+ /// a "symbol to string" expression like `symbol.as_str()`
+ Expr {
+ /// part that evaluates to `Symbol` or `Ident`
+ item: &'tcx Expr<'tcx>,
+ is_ident: bool,
+ /// whether an owned `String` is created like `to_ident_string()`
+ is_to_owned: bool,
+ },
+}
+
+impl<'tcx> SymbolStrExpr<'tcx> {
+ /// Returns a snippet that evaluates to a `Symbol` and is const if possible
+ fn as_symbol_snippet(&self, cx: &LateContext<'_>) -> Cow<'tcx, str> {
+ match *self {
+ Self::Const(def_id) => cx.tcx.def_path_str(def_id).into(),
+ Self::Expr { item, is_ident, .. } => {
+ let mut snip = snippet(cx, item.span.source_callsite(), "..");
+ if is_ident {
+ // get `Ident.name`
+ snip.to_mut().push_str(".name");
+ }
+ snip
+ },
+ }
+ }
+}
+
+declare_lint_pass!(IfChainStyle => [IF_CHAIN_STYLE]);
+
+impl<'tcx> LateLintPass<'tcx> for IfChainStyle {
+ fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx hir::Block<'_>) {
+ let (local, after, if_chain_span) = if_chain! {
+ if let [Stmt { kind: StmtKind::Local(local), .. }, after @ ..] = block.stmts;
+ if let Some(if_chain_span) = is_expn_of(block.span, "if_chain");
+ then { (local, after, if_chain_span) } else { return }
+ };
+ if is_first_if_chain_expr(cx, block.hir_id, if_chain_span) {
+ span_lint(
+ cx,
+ IF_CHAIN_STYLE,
+ if_chain_local_span(cx, local, if_chain_span),
+ "`let` expression should be above the `if_chain!`",
+ );
+ } else if local.span.ctxt() == block.span.ctxt() && is_if_chain_then(after, block.expr, if_chain_span) {
+ span_lint(
+ cx,
+ IF_CHAIN_STYLE,
+ if_chain_local_span(cx, local, if_chain_span),
+ "`let` expression should be inside `then { .. }`",
+ );
+ }
+ }
+
+ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
+ let (cond, then, els) = if let Some(higher::IfOrIfLet { cond, r#else, then }) = higher::IfOrIfLet::hir(expr) {
+ (cond, then, r#else.is_some())
+ } else {
+ return;
+ };
+ let then_block = match then.kind {
+ ExprKind::Block(block, _) => block,
+ _ => return,
+ };
+ let if_chain_span = is_expn_of(expr.span, "if_chain");
+ if !els {
+ check_nested_if_chains(cx, expr, then_block, if_chain_span);
+ }
+ let if_chain_span = match if_chain_span {
+ None => return,
+ Some(span) => span,
+ };
+ // check for `if a && b;`
+ if_chain! {
+ if let ExprKind::Binary(op, _, _) = cond.kind;
+ if op.node == BinOpKind::And;
+ if cx.sess().source_map().is_multiline(cond.span);
+ then {
+ span_lint(cx, IF_CHAIN_STYLE, cond.span, "`if a && b;` should be `if a; if b;`");
+ }
+ }
+ if is_first_if_chain_expr(cx, expr.hir_id, if_chain_span)
+ && is_if_chain_then(then_block.stmts, then_block.expr, if_chain_span)
+ {
+ span_lint(cx, IF_CHAIN_STYLE, expr.span, "`if_chain!` only has one `if`");
+ }
+ }
+}
+
+fn check_nested_if_chains(
+ cx: &LateContext<'_>,
+ if_expr: &Expr<'_>,
+ then_block: &Block<'_>,
+ if_chain_span: Option<Span>,
+) {
+ #[rustfmt::skip]
+ let (head, tail) = match *then_block {
+ Block { stmts, expr: Some(tail), .. } => (stmts, tail),
+ Block {
+ stmts: &[
+ ref head @ ..,
+ Stmt { kind: StmtKind::Expr(tail) | StmtKind::Semi(tail), .. }
+ ],
+ ..
+ } => (head, tail),
+ _ => return,
+ };
+ if_chain! {
+ if let Some(higher::IfOrIfLet { r#else: None, .. }) = higher::IfOrIfLet::hir(tail);
+ let sm = cx.sess().source_map();
+ if head
+ .iter()
+ .all(|stmt| matches!(stmt.kind, StmtKind::Local(..)) && !sm.is_multiline(stmt.span));
+ if if_chain_span.is_some() || !is_else_clause(cx.tcx, if_expr);
+ then {} else { return }
+ }
+ let (span, msg) = match (if_chain_span, is_expn_of(tail.span, "if_chain")) {
+ (None, Some(_)) => (if_expr.span, "this `if` can be part of the inner `if_chain!`"),
+ (Some(_), None) => (tail.span, "this `if` can be part of the outer `if_chain!`"),
+ (Some(a), Some(b)) if a != b => (b, "this `if_chain!` can be merged with the outer `if_chain!`"),
+ _ => return,
+ };
+ span_lint_and_then(cx, IF_CHAIN_STYLE, span, msg, |diag| {
+ let (span, msg) = match head {
+ [] => return,
+ [stmt] => (stmt.span, "this `let` statement can also be in the `if_chain!`"),
+ [a, .., b] => (
+ a.span.to(b.span),
+ "these `let` statements can also be in the `if_chain!`",
+ ),
+ };
+ diag.span_help(span, msg);
+ });
+}
+
+fn is_first_if_chain_expr(cx: &LateContext<'_>, hir_id: HirId, if_chain_span: Span) -> bool {
+ cx.tcx
+ .hir()
+ .parent_iter(hir_id)
+ .find(|(_, node)| {
+ #[rustfmt::skip]
+ !matches!(node, Node::Expr(Expr { kind: ExprKind::Block(..), .. }) | Node::Stmt(_))
+ })
+ .map_or(false, |(id, _)| {
+ is_expn_of(cx.tcx.hir().span(id), "if_chain") != Some(if_chain_span)
+ })
+}
+
+/// Checks a trailing slice of statements and expression of a `Block` to see if they are part
+/// of the `then {..}` portion of an `if_chain!`
+fn is_if_chain_then(stmts: &[Stmt<'_>], expr: Option<&Expr<'_>>, if_chain_span: Span) -> bool {
+ let span = if let [stmt, ..] = stmts {
+ stmt.span
+ } else if let Some(expr) = expr {
+ expr.span
+ } else {
+ // empty `then {}`
+ return true;
+ };
+ is_expn_of(span, "if_chain").map_or(true, |span| span != if_chain_span)
+}
+
+/// Creates a `Span` for `let x = ..;` in an `if_chain!` call.
+fn if_chain_local_span(cx: &LateContext<'_>, local: &Local<'_>, if_chain_span: Span) -> Span {
+ let mut span = local.pat.span;
+ if let Some(init) = local.init {
+ span = span.to(init.span);
+ }
+ span.adjust(if_chain_span.ctxt().outer_expn());
+ let sm = cx.sess().source_map();
+ let span = sm.span_extend_to_prev_str(span, "let", false);
+ let span = sm.span_extend_to_next_char(span, ';', false);
+ Span::new(
+ span.lo() - BytePos(3),
+ span.hi() + BytePos(1),
+ span.ctxt(),
+ span.parent(),
+ )
+}
--- /dev/null
- let result = cx
- .lint_store
- .check_lint_name(lint_name, Some(sym::clippy), &[]);
+//! This lint is used to collect metadata about clippy lints. This metadata is exported as a json
+//! file and then used to generate the [clippy lint list](https://rust-lang.github.io/rust-clippy/master/index.html)
+//!
+//! This module and therefore the entire lint is guarded by a feature flag called `internal`
+//!
+//! The module transforms all lint names to ascii lowercase to ensure that we don't have mismatches
+//! during any comparison or mapping. (Please take care of this, it's not fun to spend time on such
+//! a simple mistake)
+
+use crate::utils::internal_lints::{extract_clippy_version_value, is_lint_ref_type};
+
+use clippy_utils::diagnostics::span_lint;
+use clippy_utils::ty::{match_type, walk_ptrs_ty_depth};
+use clippy_utils::{last_path_segment, match_def_path, match_function_call, match_path, paths};
+use if_chain::if_chain;
+use rustc_ast as ast;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir::{
+ self as hir, def::DefKind, intravisit, intravisit::Visitor, ExprKind, Item, ItemKind, Mutability, QPath,
+};
+use rustc_lint::{CheckLintNameResult, LateContext, LateLintPass, LintContext, LintId};
++use rustc_middle::hir::nested_filter;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
++use rustc_span::symbol::Ident;
+use rustc_span::{sym, Loc, Span, Symbol};
+use serde::{ser::SerializeStruct, Serialize, Serializer};
+use std::collections::BinaryHeap;
+use std::fmt;
+use std::fs::{self, OpenOptions};
+use std::io::prelude::*;
+use std::path::Path;
+
+/// This is the output file of the lint collector.
+const OUTPUT_FILE: &str = "../util/gh-pages/lints.json";
+/// These lints are excluded from the export.
+const BLACK_LISTED_LINTS: [&str; 3] = ["lint_author", "deep_code_inspection", "internal_metadata_collector"];
+/// These groups will be ignored by the lint group matcher. This is useful for collections like
+/// `clippy::all`
+const IGNORED_LINT_GROUPS: [&str; 1] = ["clippy::all"];
+/// Lints within this group will be excluded from the collection. These groups
+/// have to be defined without the `clippy::` prefix.
+const EXCLUDED_LINT_GROUPS: [&str; 1] = ["internal"];
+/// Collected deprecated lint will be assigned to this group in the JSON output
+const DEPRECATED_LINT_GROUP_STR: &str = "deprecated";
+/// This is the lint level for deprecated lints that will be displayed in the lint list
+const DEPRECATED_LINT_LEVEL: &str = "none";
+/// This array holds Clippy's lint groups with their corresponding default lint level. The
+/// lint level for deprecated lints is set in `DEPRECATED_LINT_LEVEL`.
+const DEFAULT_LINT_LEVELS: &[(&str, &str)] = &[
+ ("correctness", "deny"),
+ ("suspicious", "warn"),
+ ("restriction", "allow"),
+ ("style", "warn"),
+ ("pedantic", "allow"),
+ ("complexity", "warn"),
+ ("perf", "warn"),
+ ("cargo", "allow"),
+ ("nursery", "allow"),
+];
+/// This prefix is in front of the lint groups in the lint store. The prefix will be trimmed
+/// to only keep the actual lint group in the output.
+const CLIPPY_LINT_GROUP_PREFIX: &str = "clippy::";
+
+/// This template will be used to format the configuration section in the lint documentation.
+/// The `configurations` parameter will be replaced with one or multiple formatted
+/// `ClippyConfiguration` instances. See `CONFIGURATION_VALUE_TEMPLATE` for further customizations
+macro_rules! CONFIGURATION_SECTION_TEMPLATE {
+ () => {
+ r#"
+### Configuration
+This lint has the following configuration variables:
+
+{configurations}
+"#
+ };
+}
+/// This template will be used to format an individual `ClippyConfiguration` instance in the
+/// lint documentation.
+///
+/// The format function will provide strings for the following parameters: `name`, `ty`, `doc` and
+/// `default`
+macro_rules! CONFIGURATION_VALUE_TEMPLATE {
+ () => {
+ "* `{name}`: `{ty}`: {doc} (defaults to `{default}`)\n"
+ };
+}
+
+const LINT_EMISSION_FUNCTIONS: [&[&str]; 7] = [
+ &["clippy_utils", "diagnostics", "span_lint"],
+ &["clippy_utils", "diagnostics", "span_lint_and_help"],
+ &["clippy_utils", "diagnostics", "span_lint_and_note"],
+ &["clippy_utils", "diagnostics", "span_lint_hir"],
+ &["clippy_utils", "diagnostics", "span_lint_and_sugg"],
+ &["clippy_utils", "diagnostics", "span_lint_and_then"],
+ &["clippy_utils", "diagnostics", "span_lint_hir_and_then"],
+];
+const SUGGESTION_DIAGNOSTIC_BUILDER_METHODS: [(&str, bool); 9] = [
+ ("span_suggestion", false),
+ ("span_suggestion_short", false),
+ ("span_suggestion_verbose", false),
+ ("span_suggestion_hidden", false),
+ ("tool_only_span_suggestion", false),
+ ("multipart_suggestion", true),
+ ("multipart_suggestions", true),
+ ("tool_only_multipart_suggestion", true),
+ ("span_suggestions", true),
+];
+const SUGGESTION_FUNCTIONS: [&[&str]; 2] = [
+ &["clippy_utils", "diagnostics", "multispan_sugg"],
+ &["clippy_utils", "diagnostics", "multispan_sugg_with_applicability"],
+];
+const DEPRECATED_LINT_TYPE: [&str; 3] = ["clippy_lints", "deprecated_lints", "ClippyDeprecatedLint"];
+
+/// The index of the applicability name of `paths::APPLICABILITY_VALUES`
+const APPLICABILITY_NAME_INDEX: usize = 2;
+/// This applicability will be set for unresolved applicability values.
+const APPLICABILITY_UNRESOLVED_STR: &str = "Unresolved";
+/// The version that will be displayed if none has been defined
+const VERION_DEFAULT_STR: &str = "Unknown";
+
+declare_clippy_lint! {
+ /// ### What it does
+ /// Collects metadata about clippy lints for the website.
+ ///
+ /// This lint will be used to report problems of syntax parsing. You should hopefully never
+ /// see this but never say never I guess ^^
+ ///
+ /// ### Why is this bad?
+ /// This is not a bad thing but definitely a hacky way to do it. See
+ /// issue [#4310](https://github.com/rust-lang/rust-clippy/issues/4310) for a discussion
+ /// about the implementation.
+ ///
+ /// ### Known problems
+ /// Hopefully none. It would be pretty uncool to have a problem here :)
+ ///
+ /// ### Example output
+ /// ```json,ignore
+ /// {
+ /// "id": "internal_metadata_collector",
+ /// "id_span": {
+ /// "path": "clippy_lints/src/utils/internal_lints/metadata_collector.rs",
+ /// "line": 1
+ /// },
+ /// "group": "clippy::internal",
+ /// "docs": " ### What it does\nCollects metadata about clippy lints for the website. [...] "
+ /// }
+ /// ```
+ #[clippy::version = "1.56.0"]
+ pub INTERNAL_METADATA_COLLECTOR,
+ internal_warn,
+ "A busy bee collection metadata about lints"
+}
+
+impl_lint_pass!(MetadataCollector => [INTERNAL_METADATA_COLLECTOR]);
+
+#[allow(clippy::module_name_repetitions)]
+#[derive(Debug, Clone)]
+pub struct MetadataCollector {
+ /// All collected lints
+ ///
+ /// We use a Heap here to have the lints added in alphabetic order in the export
+ lints: BinaryHeap<LintMetadata>,
+ applicability_info: FxHashMap<String, ApplicabilityInfo>,
+ config: Vec<ClippyConfiguration>,
+}
+
+impl MetadataCollector {
+ pub fn new() -> Self {
+ Self {
+ lints: BinaryHeap::<LintMetadata>::default(),
+ applicability_info: FxHashMap::<String, ApplicabilityInfo>::default(),
+ config: collect_configs(),
+ }
+ }
+
+ fn get_lint_configs(&self, lint_name: &str) -> Option<String> {
+ self.config
+ .iter()
+ .filter(|config| config.lints.iter().any(|lint| lint == lint_name))
+ .map(ToString::to_string)
+ .reduce(|acc, x| acc + &x)
+ .map(|configurations| format!(CONFIGURATION_SECTION_TEMPLATE!(), configurations = configurations))
+ }
+}
+
+impl Drop for MetadataCollector {
+ /// You might ask: How hacky is this?
+ /// My answer: YES
+ fn drop(&mut self) {
+ // The metadata collector gets dropped twice, this makes sure that we only write
+ // when the list is full
+ if self.lints.is_empty() {
+ return;
+ }
+
+ let mut applicability_info = std::mem::take(&mut self.applicability_info);
+
+ // Mapping the final data
+ let mut lints = std::mem::take(&mut self.lints).into_sorted_vec();
+ lints
+ .iter_mut()
+ .for_each(|x| x.applicability = Some(applicability_info.remove(&x.id).unwrap_or_default()));
+
+ // Outputting
+ if Path::new(OUTPUT_FILE).exists() {
+ fs::remove_file(OUTPUT_FILE).unwrap();
+ }
+ let mut file = OpenOptions::new().write(true).create(true).open(OUTPUT_FILE).unwrap();
+ writeln!(file, "{}", serde_json::to_string_pretty(&lints).unwrap()).unwrap();
+ }
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct LintMetadata {
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: String,
+ docs: String,
+ version: String,
+ /// This field is only used in the output and will only be
+ /// mapped shortly before the actual output.
+ applicability: Option<ApplicabilityInfo>,
+}
+
+impl LintMetadata {
+ fn new(
+ id: String,
+ id_span: SerializableSpan,
+ group: String,
+ level: &'static str,
+ version: String,
+ docs: String,
+ ) -> Self {
+ Self {
+ id,
+ id_span,
+ group,
+ level: level.to_string(),
+ version,
+ docs,
+ applicability: None,
+ }
+ }
+}
+
+#[derive(Debug, Clone, Serialize, PartialEq, Eq, PartialOrd, Ord)]
+struct SerializableSpan {
+ path: String,
+ line: usize,
+}
+
+impl std::fmt::Display for SerializableSpan {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ write!(f, "{}:{}", self.path.rsplit('/').next().unwrap_or_default(), self.line)
+ }
+}
+
+impl SerializableSpan {
+ fn from_item(cx: &LateContext<'_>, item: &Item<'_>) -> Self {
+ Self::from_span(cx, item.ident.span)
+ }
+
+ fn from_span(cx: &LateContext<'_>, span: Span) -> Self {
+ let loc: Loc = cx.sess().source_map().lookup_char_pos(span.lo());
+
+ Self {
+ path: format!("{}", loc.file.name.prefer_remapped()),
+ line: loc.line,
+ }
+ }
+}
+
+#[derive(Debug, Clone, Default, PartialEq, Eq, PartialOrd, Ord)]
+struct ApplicabilityInfo {
+ /// Indicates if any of the lint emissions uses multiple spans. This is related to
+ /// [rustfix#141](https://github.com/rust-lang/rustfix/issues/141) as such suggestions can
+ /// currently not be applied automatically.
+ is_multi_part_suggestion: bool,
+ applicability: Option<usize>,
+}
+
+impl Serialize for ApplicabilityInfo {
+ fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+ where
+ S: Serializer,
+ {
+ let mut s = serializer.serialize_struct("ApplicabilityInfo", 2)?;
+ s.serialize_field("is_multi_part_suggestion", &self.is_multi_part_suggestion)?;
+ if let Some(index) = self.applicability {
+ s.serialize_field(
+ "applicability",
+ &paths::APPLICABILITY_VALUES[index][APPLICABILITY_NAME_INDEX],
+ )?;
+ } else {
+ s.serialize_field("applicability", APPLICABILITY_UNRESOLVED_STR)?;
+ }
+ s.end()
+ }
+}
+
+// ==================================================================
+// Configuration
+// ==================================================================
+#[derive(Debug, Clone, Default)]
+pub struct ClippyConfiguration {
+ name: String,
+ config_type: &'static str,
+ default: String,
+ lints: Vec<String>,
+ doc: String,
+ #[allow(dead_code)]
+ deprecation_reason: Option<&'static str>,
+}
+
+impl ClippyConfiguration {
+ pub fn new(
+ name: &'static str,
+ config_type: &'static str,
+ default: String,
+ doc_comment: &'static str,
+ deprecation_reason: Option<&'static str>,
+ ) -> Self {
+ let (lints, doc) = parse_config_field_doc(doc_comment)
+ .unwrap_or_else(|| (vec![], "[ERROR] MALFORMED DOC COMMENT".to_string()));
+
+ Self {
+ name: to_kebab(name),
+ lints,
+ doc,
+ config_type,
+ default,
+ deprecation_reason,
+ }
+ }
+}
+
+fn collect_configs() -> Vec<ClippyConfiguration> {
+ crate::utils::conf::metadata::get_configuration_metadata()
+}
+
+/// This parses the field documentation of the config struct.
+///
+/// ```rust, ignore
+/// parse_config_field_doc(cx, "Lint: LINT_NAME_1, LINT_NAME_2. Papa penguin, papa penguin")
+/// ```
+///
+/// Would yield:
+/// ```rust, ignore
+/// Some(["lint_name_1", "lint_name_2"], "Papa penguin, papa penguin")
+/// ```
+fn parse_config_field_doc(doc_comment: &str) -> Option<(Vec<String>, String)> {
+ const DOC_START: &str = " Lint: ";
+ if_chain! {
+ if doc_comment.starts_with(DOC_START);
+ if let Some(split_pos) = doc_comment.find('.');
+ then {
+ let mut doc_comment = doc_comment.to_string();
+ let mut documentation = doc_comment.split_off(split_pos);
+
+ // Extract lints
+ doc_comment.make_ascii_lowercase();
+ let lints: Vec<String> = doc_comment.split_off(DOC_START.len()).split(", ").map(str::to_string).collect();
+
+ // Format documentation correctly
+ // split off leading `.` from lint name list and indent for correct formatting
+ documentation = documentation.trim_start_matches('.').trim().replace("\n ", "\n ");
+
+ Some((lints, documentation))
+ } else {
+ None
+ }
+ }
+}
+
+/// Transforms a given `snake_case_string` to a tasty `kebab-case-string`
+fn to_kebab(config_name: &str) -> String {
+ config_name.replace('_', "-")
+}
+
+impl fmt::Display for ClippyConfiguration {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> fmt::Result {
+ write!(
+ f,
+ CONFIGURATION_VALUE_TEMPLATE!(),
+ name = self.name,
+ ty = self.config_type,
+ doc = self.doc,
+ default = self.default
+ )
+ }
+}
+
+// ==================================================================
+// Lint pass
+// ==================================================================
+impl<'hir> LateLintPass<'hir> for MetadataCollector {
+ /// Collecting lint declarations like:
+ /// ```rust, ignore
+ /// declare_clippy_lint! {
+ /// /// ### What it does
+ /// /// Something IDK.
+ /// pub SOME_LINT,
+ /// internal,
+ /// "Who am I?"
+ /// }
+ /// ```
+ fn check_item(&mut self, cx: &LateContext<'hir>, item: &'hir Item<'_>) {
+ if let ItemKind::Static(ty, Mutability::Not, _) = item.kind {
+ // Normal lint
+ if_chain! {
+ // item validation
+ if is_lint_ref_type(cx, ty);
+ // blacklist check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // metadata extraction
+ if let Some((group, level)) = get_lint_group_and_level_or_lint(cx, &lint_name, item);
+ if let Some(mut docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ if let Some(configuration_section) = self.get_lint_configs(&lint_name) {
+ docs.push_str(&configuration_section);
+ }
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ group,
+ level,
+ version,
+ docs,
+ ));
+ }
+ }
+
+ if_chain! {
+ if is_deprecated_lint(cx, ty);
+ // blacklist check
+ let lint_name = sym_to_string(item.ident.name).to_ascii_lowercase();
+ if !BLACK_LISTED_LINTS.contains(&lint_name.as_str());
+ // Metadata the little we can get from a deprecated lint
+ if let Some(docs) = extract_attr_docs_or_lint(cx, item);
+ then {
+ let version = get_lint_version(cx, item);
+
+ self.lints.push(LintMetadata::new(
+ lint_name,
+ SerializableSpan::from_item(cx, item),
+ DEPRECATED_LINT_GROUP_STR.to_string(),
+ DEPRECATED_LINT_LEVEL,
+ version,
+ docs,
+ ));
+ }
+ }
+ }
+ }
+
+ /// Collecting constant applicability from the actual lint emissions
+ ///
+ /// Example:
+ /// ```rust, ignore
+ /// span_lint_and_sugg(
+ /// cx,
+ /// SOME_LINT,
+ /// item.span,
+ /// "Le lint message",
+ /// "Here comes help:",
+ /// "#![allow(clippy::all)]",
+ /// Applicability::MachineApplicable, // <-- Extracts this constant value
+ /// );
+ /// ```
+ fn check_expr(&mut self, cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) {
+ if let Some(args) = match_lint_emission(cx, expr) {
+ let mut emission_info = extract_emission_info(cx, args);
+ if emission_info.is_empty() {
+ // See:
+ // - src/misc.rs:734:9
+ // - src/methods/mod.rs:3545:13
+ // - src/methods/mod.rs:3496:13
+ // We are basically unable to resolve the lint name itself.
+ return;
+ }
+
+ for (lint_name, applicability, is_multi_part) in emission_info.drain(..) {
+ let app_info = self.applicability_info.entry(lint_name).or_default();
+ app_info.applicability = applicability;
+ app_info.is_multi_part_suggestion = is_multi_part;
+ }
+ }
+ }
+}
+
+// ==================================================================
+// Lint definition extraction
+// ==================================================================
+fn sym_to_string(sym: Symbol) -> String {
+ sym.as_str().to_string()
+}
+
+fn extract_attr_docs_or_lint(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ extract_attr_docs(cx, item).or_else(|| {
+ lint_collection_error_item(cx, item, "could not collect the lint documentation");
+ None
+ })
+}
+
+/// This function collects all documentation that has been added to an item using
+/// `#[doc = r""]` attributes. Several attributes are aggravated using line breaks
+///
+/// ```ignore
+/// #[doc = r"Hello world!"]
+/// #[doc = r"=^.^="]
+/// struct SomeItem {}
+/// ```
+///
+/// Would result in `Hello world!\n=^.^=\n`
+///
+/// ---
+///
+/// This function may modify the doc comment to ensure that the string can be displayed using a
+/// markdown viewer in Clippy's lint list. The following modifications could be applied:
+/// * Removal of leading space after a new line. (Important to display tables)
+/// * Ensures that code blocks only contain language information
+fn extract_attr_docs(cx: &LateContext<'_>, item: &Item<'_>) -> Option<String> {
+ let attrs = cx.tcx.hir().attrs(item.hir_id());
+ let mut lines = attrs.iter().filter_map(ast::Attribute::doc_str);
+ let mut docs = String::from(&*lines.next()?.as_str());
+ let mut in_code_block = false;
+ let mut is_code_block_rust = false;
+ for line in lines {
+ let line = line.as_str();
+ let line = &*line;
+
+ // Rustdoc hides code lines starting with `# ` and this removes them from Clippy's lint list :)
+ if is_code_block_rust && line.trim_start().starts_with("# ") {
+ continue;
+ }
+
+ // The line should be represented in the lint list, even if it's just an empty line
+ docs.push('\n');
+ if let Some(info) = line.trim_start().strip_prefix("```") {
+ in_code_block = !in_code_block;
+ is_code_block_rust = false;
+ if in_code_block {
+ let lang = info
+ .trim()
+ .split(',')
+ // remove rustdoc directives
+ .find(|&s| !matches!(s, "" | "ignore" | "no_run" | "should_panic"))
+ // if no language is present, fill in "rust"
+ .unwrap_or("rust");
+ docs.push_str("```");
+ docs.push_str(lang);
+
+ is_code_block_rust = lang == "rust";
+ continue;
+ }
+ }
+ // This removes the leading space that the macro translation introduces
+ if let Some(stripped_doc) = line.strip_prefix(' ') {
+ docs.push_str(stripped_doc);
+ } else if !line.is_empty() {
+ docs.push_str(line);
+ }
+ }
+ Some(docs)
+}
+
+fn get_lint_version(cx: &LateContext<'_>, item: &Item<'_>) -> String {
+ extract_clippy_version_value(cx, item).map_or_else(
+ || VERION_DEFAULT_STR.to_string(),
+ |version| version.as_str().to_string(),
+ )
+}
+
+fn get_lint_group_and_level_or_lint(
+ cx: &LateContext<'_>,
+ lint_name: &str,
+ item: &Item<'_>,
+) -> Option<(String, &'static str)> {
++ let result = cx.lint_store.check_lint_name(
++ lint_name,
++ Some(sym::clippy),
++ &[Ident::with_dummy_span(sym::clippy)].into_iter().collect(),
++ );
+ if let CheckLintNameResult::Tool(Ok(lint_lst)) = result {
+ if let Some(group) = get_lint_group(cx, lint_lst[0]) {
+ if EXCLUDED_LINT_GROUPS.contains(&group.as_str()) {
+ return None;
+ }
+
+ if let Some(level) = get_lint_level_from_group(&group) {
+ Some((group, level))
+ } else {
+ lint_collection_error_item(
+ cx,
+ item,
+ &format!("Unable to determine lint level for found group `{}`", group),
+ );
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to determine lint group");
+ None
+ }
+ } else {
+ lint_collection_error_item(cx, item, "Unable to find lint in lint_store");
+ None
+ }
+}
+
+fn get_lint_group(cx: &LateContext<'_>, lint_id: LintId) -> Option<String> {
+ for (group_name, lints, _) in &cx.lint_store.get_lint_groups() {
+ if IGNORED_LINT_GROUPS.contains(group_name) {
+ continue;
+ }
+
+ if lints.iter().any(|group_lint| *group_lint == lint_id) {
+ let group = group_name.strip_prefix(CLIPPY_LINT_GROUP_PREFIX).unwrap_or(group_name);
+ return Some((*group).to_string());
+ }
+ }
+
+ None
+}
+
+fn get_lint_level_from_group(lint_group: &str) -> Option<&'static str> {
+ DEFAULT_LINT_LEVELS
+ .iter()
+ .find_map(|(group_name, group_level)| (*group_name == lint_group).then(|| *group_level))
+}
+
+fn is_deprecated_lint(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let hir::TyKind::Path(ref path) = ty.kind {
+ if let hir::def::Res::Def(DefKind::Struct, def_id) = cx.qpath_res(path, ty.hir_id) {
+ return match_def_path(cx, def_id, &DEPRECATED_LINT_TYPE);
+ }
+ }
+
+ false
+}
+
+// ==================================================================
+// Lint emission
+// ==================================================================
+fn lint_collection_error_item(cx: &LateContext<'_>, item: &Item<'_>, message: &str) {
+ span_lint(
+ cx,
+ INTERNAL_METADATA_COLLECTOR,
+ item.ident.span,
+ &format!("metadata collection error for `{}`: {}", item.ident.name, message),
+ );
+}
+
+// ==================================================================
+// Applicability
+// ==================================================================
+/// This function checks if a given expression is equal to a simple lint emission function call.
+/// It will return the function arguments if the emission matched any function.
+fn match_lint_emission<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'_>) -> Option<&'hir [hir::Expr<'hir>]> {
+ LINT_EMISSION_FUNCTIONS
+ .iter()
+ .find_map(|emission_fn| match_function_call(cx, expr, emission_fn))
+}
+
+fn take_higher_applicability(a: Option<usize>, b: Option<usize>) -> Option<usize> {
+ a.map_or(b, |a| a.max(b.unwrap_or_default()).into())
+}
+
+fn extract_emission_info<'hir>(
+ cx: &LateContext<'hir>,
+ args: &'hir [hir::Expr<'hir>],
+) -> Vec<(String, Option<usize>, bool)> {
+ let mut lints = Vec::new();
+ let mut applicability = None;
+ let mut multi_part = false;
+
+ for arg in args {
+ let (arg_ty, _) = walk_ptrs_ty_depth(cx.typeck_results().expr_ty(arg));
+
+ if match_type(cx, arg_ty, &paths::LINT) {
+ // If we found the lint arg, extract the lint name
+ let mut resolved_lints = resolve_lints(cx, arg);
+ lints.append(&mut resolved_lints);
+ } else if match_type(cx, arg_ty, &paths::APPLICABILITY) {
+ applicability = resolve_applicability(cx, arg);
+ } else if arg_ty.is_closure() {
+ multi_part |= check_is_multi_part(cx, arg);
+ applicability = applicability.or_else(|| resolve_applicability(cx, arg));
+ }
+ }
+
+ lints
+ .drain(..)
+ .map(|lint_name| (lint_name, applicability, multi_part))
+ .collect()
+}
+
+/// Resolves the possible lints that this expression could reference
+fn resolve_lints<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Vec<String> {
+ let mut resolver = LintResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.lints
+}
+
+/// This function tries to resolve the linked applicability to the given expression.
+fn resolve_applicability<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<usize> {
+ let mut resolver = ApplicabilityResolver::new(cx);
+ resolver.visit_expr(expr);
+ resolver.complete()
+}
+
+fn check_is_multi_part<'hir>(cx: &LateContext<'hir>, closure_expr: &'hir hir::Expr<'hir>) -> bool {
+ if let ExprKind::Closure(_, _, body_id, _, _) = closure_expr.kind {
+ let mut scanner = IsMultiSpanScanner::new(cx);
+ intravisit::walk_body(&mut scanner, cx.tcx.hir().body(body_id));
+ return scanner.is_multi_part();
+ } else if let Some(local) = get_parent_local(cx, closure_expr) {
+ if let Some(local_init) = local.init {
+ return check_is_multi_part(cx, local_init);
+ }
+ }
+
+ false
+}
+
+struct LintResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ lints: Vec<String>,
+}
+
+impl<'a, 'hir> LintResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ lints: Vec::<String>::default(),
+ }
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for LintResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ if_chain! {
+ if let ExprKind::Path(qpath) = &expr.kind;
+ if let QPath::Resolved(_, path) = qpath;
+
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+ if match_type(self.cx, expr_ty, &paths::LINT);
+ then {
+ if let hir::def::Res::Def(DefKind::Static, _) = path.res {
+ let lint_name = last_path_segment(qpath).ident.name;
+ self.lints.push(sym_to_string(lint_name).to_ascii_lowercase());
+ } else if let Some(local) = get_parent_local(self.cx, expr) {
+ if let Some(local_init) = local.init {
+ intravisit::walk_expr(self, local_init);
+ }
+ }
+ }
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct ApplicabilityResolver<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ /// This is the index of hightest `Applicability` for `paths::APPLICABILITY_VALUES`
+ applicability_index: Option<usize>,
+}
+
+impl<'a, 'hir> ApplicabilityResolver<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ applicability_index: None,
+ }
+ }
+
+ fn add_new_index(&mut self, new_index: usize) {
+ self.applicability_index = take_higher_applicability(self.applicability_index, Some(new_index));
+ }
+
+ fn complete(self) -> Option<usize> {
+ self.applicability_index
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for ApplicabilityResolver<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_path(&mut self, path: &'hir hir::Path<'hir>, _id: hir::HirId) {
+ for (index, enum_value) in paths::APPLICABILITY_VALUES.iter().enumerate() {
+ if match_path(path, enum_value) {
+ self.add_new_index(index);
+ return;
+ }
+ }
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ let (expr_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(expr));
+
+ if_chain! {
+ if match_type(self.cx, expr_ty, &paths::APPLICABILITY);
+ if let Some(local) = get_parent_local(self.cx, expr);
+ if let Some(local_init) = local.init;
+ then {
+ intravisit::walk_expr(self, local_init);
+ }
+ };
+
+ intravisit::walk_expr(self, expr);
+ }
+}
+
+/// This returns the parent local node if the expression is a reference one
+fn get_parent_local<'hir>(cx: &LateContext<'hir>, expr: &'hir hir::Expr<'hir>) -> Option<&'hir hir::Local<'hir>> {
+ if let ExprKind::Path(QPath::Resolved(_, path)) = expr.kind {
+ if let hir::def::Res::Local(local_hir) = path.res {
+ return get_parent_local_hir_id(cx, local_hir);
+ }
+ }
+
+ None
+}
+
+fn get_parent_local_hir_id<'hir>(cx: &LateContext<'hir>, hir_id: hir::HirId) -> Option<&'hir hir::Local<'hir>> {
+ let map = cx.tcx.hir();
+
+ match map.find(map.get_parent_node(hir_id)) {
+ Some(hir::Node::Local(local)) => Some(local),
+ Some(hir::Node::Pat(pattern)) => get_parent_local_hir_id(cx, pattern.hir_id),
+ _ => None,
+ }
+}
+
+/// This visitor finds the highest applicability value in the visited expressions
+struct IsMultiSpanScanner<'a, 'hir> {
+ cx: &'a LateContext<'hir>,
+ suggestion_count: usize,
+}
+
+impl<'a, 'hir> IsMultiSpanScanner<'a, 'hir> {
+ fn new(cx: &'a LateContext<'hir>) -> Self {
+ Self {
+ cx,
+ suggestion_count: 0,
+ }
+ }
+
+ /// Add a new single expression suggestion to the counter
+ fn add_single_span_suggestion(&mut self) {
+ self.suggestion_count += 1;
+ }
+
+ /// Signals that a suggestion with possible multiple spans was found
+ fn add_multi_part_suggestion(&mut self) {
+ self.suggestion_count += 2;
+ }
+
+ /// Checks if the suggestions include multiple spanns
+ fn is_multi_part(&self) -> bool {
+ self.suggestion_count > 1
+ }
+}
+
+impl<'a, 'hir> intravisit::Visitor<'hir> for IsMultiSpanScanner<'a, 'hir> {
+ type NestedFilter = nested_filter::All;
+
+ fn nested_visit_map(&mut self) -> Self::Map {
+ self.cx.tcx.hir()
+ }
+
+ fn visit_expr(&mut self, expr: &'hir hir::Expr<'hir>) {
+ // Early return if the lint is already multi span
+ if self.is_multi_part() {
+ return;
+ }
+
+ match &expr.kind {
+ ExprKind::Call(fn_expr, _args) => {
+ let found_function = SUGGESTION_FUNCTIONS
+ .iter()
+ .any(|func_path| match_function_call(self.cx, fn_expr, func_path).is_some());
+ if found_function {
+ // These functions are all multi part suggestions
+ self.add_single_span_suggestion();
+ }
+ },
+ ExprKind::MethodCall(path, arg, _arg_span) => {
+ let (self_ty, _) = walk_ptrs_ty_depth(self.cx.typeck_results().expr_ty(&arg[0]));
+ if match_type(self.cx, self_ty, &paths::DIAGNOSTIC_BUILDER) {
+ let called_method = path.ident.name.as_str().to_string();
+ for (method_name, is_multi_part) in &SUGGESTION_DIAGNOSTIC_BUILDER_METHODS {
+ if *method_name == called_method {
+ if *is_multi_part {
+ self.add_multi_part_suggestion();
+ } else {
+ self.add_single_span_suggestion();
+ }
+ break;
+ }
+ }
+ }
+ },
+ _ => {},
+ }
+
+ intravisit::walk_expr(self, expr);
+ }
+}
--- /dev/null
- match (l, r) {
- (Term::Ty(l), Term::Ty(r)) => eq_ty(l,r),
- (Term::Const(l), Term::Const(r)) => eq_anon_const(l,r),
- _ => false,
- }
+//! Utilities for manipulating and extracting information from `rustc_ast::ast`.
+//!
+//! - The `eq_foobar` functions test for semantic equality but ignores `NodeId`s and `Span`s.
+
+#![allow(clippy::similar_names, clippy::wildcard_imports, clippy::enum_glob_use)]
+
+use crate::{both, over};
+use rustc_ast::ptr::P;
+use rustc_ast::{self as ast, *};
+use rustc_span::symbol::Ident;
+use std::mem;
+
+pub mod ident_iter;
+pub use ident_iter::IdentIter;
+
+pub fn is_useless_with_eq_exprs(kind: BinOpKind) -> bool {
+ use BinOpKind::*;
+ matches!(
+ kind,
+ Sub | Div | Eq | Lt | Le | Gt | Ge | Ne | And | Or | BitXor | BitAnd | BitOr
+ )
+}
+
+/// Checks if each element in the first slice is contained within the latter as per `eq_fn`.
+pub fn unordered_over<X>(left: &[X], right: &[X], mut eq_fn: impl FnMut(&X, &X) -> bool) -> bool {
+ left.len() == right.len() && left.iter().all(|l| right.iter().any(|r| eq_fn(l, r)))
+}
+
+pub fn eq_id(l: Ident, r: Ident) -> bool {
+ l.name == r.name
+}
+
+pub fn eq_pat(l: &Pat, r: &Pat) -> bool {
+ use PatKind::*;
+ match (&l.kind, &r.kind) {
+ (Paren(l), _) => eq_pat(l, r),
+ (_, Paren(r)) => eq_pat(l, r),
+ (Wild, Wild) | (Rest, Rest) => true,
+ (Lit(l), Lit(r)) => eq_expr(l, r),
+ (Ident(b1, i1, s1), Ident(b2, i2, s2)) => b1 == b2 && eq_id(*i1, *i2) && both(s1, s2, |l, r| eq_pat(l, r)),
+ (Range(lf, lt, le), Range(rf, rt, re)) => {
+ eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt) && eq_range_end(&le.node, &re.node)
+ },
+ (Box(l), Box(r))
+ | (Ref(l, Mutability::Not), Ref(r, Mutability::Not))
+ | (Ref(l, Mutability::Mut), Ref(r, Mutability::Mut)) => eq_pat(l, r),
+ (Tuple(l), Tuple(r)) | (Slice(l), Slice(r)) => over(l, r, |l, r| eq_pat(l, r)),
+ (Path(lq, lp), Path(rq, rp)) => both(lq, rq, eq_qself) && eq_path(lp, rp),
+ (TupleStruct(lqself, lp, lfs), TupleStruct(rqself, rp, rfs)) => {
+ eq_maybe_qself(lqself, rqself) && eq_path(lp, rp) && over(lfs, rfs, |l, r| eq_pat(l, r))
+ },
+ (Struct(lqself, lp, lfs, lr), Struct(rqself, rp, rfs, rr)) => {
+ lr == rr && eq_maybe_qself(lqself, rqself) && eq_path(lp, rp) && unordered_over(lfs, rfs, eq_field_pat)
+ },
+ (Or(ls), Or(rs)) => unordered_over(ls, rs, |l, r| eq_pat(l, r)),
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_range_end(l: &RangeEnd, r: &RangeEnd) -> bool {
+ match (l, r) {
+ (RangeEnd::Excluded, RangeEnd::Excluded) => true,
+ (RangeEnd::Included(l), RangeEnd::Included(r)) => {
+ matches!(l, RangeSyntax::DotDotEq) == matches!(r, RangeSyntax::DotDotEq)
+ },
+ _ => false,
+ }
+}
+
+pub fn eq_field_pat(l: &PatField, r: &PatField) -> bool {
+ l.is_placeholder == r.is_placeholder
+ && eq_id(l.ident, r.ident)
+ && eq_pat(&l.pat, &r.pat)
+ && over(&l.attrs, &r.attrs, eq_attr)
+}
+
+pub fn eq_qself(l: &QSelf, r: &QSelf) -> bool {
+ l.position == r.position && eq_ty(&l.ty, &r.ty)
+}
+
+pub fn eq_maybe_qself(l: &Option<QSelf>, r: &Option<QSelf>) -> bool {
+ match (l, r) {
+ (Some(l), Some(r)) => eq_qself(l, r),
+ (None, None) => true,
+ _ => false,
+ }
+}
+
+pub fn eq_path(l: &Path, r: &Path) -> bool {
+ over(&l.segments, &r.segments, eq_path_seg)
+}
+
+pub fn eq_path_seg(l: &PathSegment, r: &PathSegment) -> bool {
+ eq_id(l.ident, r.ident) && both(&l.args, &r.args, |l, r| eq_generic_args(l, r))
+}
+
+pub fn eq_generic_args(l: &GenericArgs, r: &GenericArgs) -> bool {
+ match (l, r) {
+ (GenericArgs::AngleBracketed(l), GenericArgs::AngleBracketed(r)) => over(&l.args, &r.args, eq_angle_arg),
+ (GenericArgs::Parenthesized(l), GenericArgs::Parenthesized(r)) => {
+ over(&l.inputs, &r.inputs, |l, r| eq_ty(l, r)) && eq_fn_ret_ty(&l.output, &r.output)
+ },
+ _ => false,
+ }
+}
+
+pub fn eq_angle_arg(l: &AngleBracketedArg, r: &AngleBracketedArg) -> bool {
+ match (l, r) {
+ (AngleBracketedArg::Arg(l), AngleBracketedArg::Arg(r)) => eq_generic_arg(l, r),
+ (AngleBracketedArg::Constraint(l), AngleBracketedArg::Constraint(r)) => eq_assoc_constraint(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_generic_arg(l: &GenericArg, r: &GenericArg) -> bool {
+ match (l, r) {
+ (GenericArg::Lifetime(l), GenericArg::Lifetime(r)) => eq_id(l.ident, r.ident),
+ (GenericArg::Type(l), GenericArg::Type(r)) => eq_ty(l, r),
+ (GenericArg::Const(l), GenericArg::Const(r)) => eq_expr(&l.value, &r.value),
+ _ => false,
+ }
+}
+
+pub fn eq_expr_opt(l: &Option<P<Expr>>, r: &Option<P<Expr>>) -> bool {
+ both(l, r, |l, r| eq_expr(l, r))
+}
+
+pub fn eq_struct_rest(l: &StructRest, r: &StructRest) -> bool {
+ match (l, r) {
+ (StructRest::Base(lb), StructRest::Base(rb)) => eq_expr(lb, rb),
+ (StructRest::Rest(_), StructRest::Rest(_)) | (StructRest::None, StructRest::None) => true,
+ _ => false,
+ }
+}
+
+pub fn eq_expr(l: &Expr, r: &Expr) -> bool {
+ use ExprKind::*;
+ if !over(&l.attrs, &r.attrs, eq_attr) {
+ return false;
+ }
+ match (&l.kind, &r.kind) {
+ (Paren(l), _) => eq_expr(l, r),
+ (_, Paren(r)) => eq_expr(l, r),
+ (Err, Err) => true,
+ (Box(l), Box(r)) | (Try(l), Try(r)) | (Await(l), Await(r)) => eq_expr(l, r),
+ (Array(l), Array(r)) | (Tup(l), Tup(r)) => over(l, r, |l, r| eq_expr(l, r)),
+ (Repeat(le, ls), Repeat(re, rs)) => eq_expr(le, re) && eq_expr(&ls.value, &rs.value),
+ (Call(lc, la), Call(rc, ra)) => eq_expr(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)),
+ (MethodCall(lc, la, _), MethodCall(rc, ra, _)) => eq_path_seg(lc, rc) && over(la, ra, |l, r| eq_expr(l, r)),
+ (Binary(lo, ll, lr), Binary(ro, rl, rr)) => lo.node == ro.node && eq_expr(ll, rl) && eq_expr(lr, rr),
+ (Unary(lo, l), Unary(ro, r)) => mem::discriminant(lo) == mem::discriminant(ro) && eq_expr(l, r),
+ (Lit(l), Lit(r)) => l.kind == r.kind,
+ (Cast(l, lt), Cast(r, rt)) | (Type(l, lt), Type(r, rt)) => eq_expr(l, r) && eq_ty(lt, rt),
+ (Let(lp, le, _), Let(rp, re, _)) => eq_pat(lp, rp) && eq_expr(le, re),
+ (If(lc, lt, le), If(rc, rt, re)) => eq_expr(lc, rc) && eq_block(lt, rt) && eq_expr_opt(le, re),
+ (While(lc, lt, ll), While(rc, rt, rl)) => eq_label(ll, rl) && eq_expr(lc, rc) && eq_block(lt, rt),
+ (ForLoop(lp, li, lt, ll), ForLoop(rp, ri, rt, rl)) => {
+ eq_label(ll, rl) && eq_pat(lp, rp) && eq_expr(li, ri) && eq_block(lt, rt)
+ },
+ (Loop(lt, ll), Loop(rt, rl)) => eq_label(ll, rl) && eq_block(lt, rt),
+ (Block(lb, ll), Block(rb, rl)) => eq_label(ll, rl) && eq_block(lb, rb),
+ (TryBlock(l), TryBlock(r)) => eq_block(l, r),
+ (Yield(l), Yield(r)) | (Ret(l), Ret(r)) => eq_expr_opt(l, r),
+ (Break(ll, le), Break(rl, re)) => eq_label(ll, rl) && eq_expr_opt(le, re),
+ (Continue(ll), Continue(rl)) => eq_label(ll, rl),
+ (Assign(l1, l2, _), Assign(r1, r2, _)) | (Index(l1, l2), Index(r1, r2)) => eq_expr(l1, r1) && eq_expr(l2, r2),
+ (AssignOp(lo, lp, lv), AssignOp(ro, rp, rv)) => lo.node == ro.node && eq_expr(lp, rp) && eq_expr(lv, rv),
+ (Field(lp, lf), Field(rp, rf)) => eq_id(*lf, *rf) && eq_expr(lp, rp),
+ (Match(ls, la), Match(rs, ra)) => eq_expr(ls, rs) && over(la, ra, eq_arm),
+ (Closure(lc, la, lm, lf, lb, _), Closure(rc, ra, rm, rf, rb, _)) => {
+ lc == rc && la.is_async() == ra.is_async() && lm == rm && eq_fn_decl(lf, rf) && eq_expr(lb, rb)
+ },
+ (Async(lc, _, lb), Async(rc, _, rb)) => lc == rc && eq_block(lb, rb),
+ (Range(lf, lt, ll), Range(rf, rt, rl)) => ll == rl && eq_expr_opt(lf, rf) && eq_expr_opt(lt, rt),
+ (AddrOf(lbk, lm, le), AddrOf(rbk, rm, re)) => lbk == rbk && lm == rm && eq_expr(le, re),
+ (Path(lq, lp), Path(rq, rp)) => both(lq, rq, eq_qself) && eq_path(lp, rp),
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ (Struct(lse), Struct(rse)) => {
+ eq_maybe_qself(&lse.qself, &rse.qself)
+ && eq_path(&lse.path, &rse.path)
+ && eq_struct_rest(&lse.rest, &rse.rest)
+ && unordered_over(&lse.fields, &rse.fields, eq_field)
+ },
+ _ => false,
+ }
+}
+
+pub fn eq_field(l: &ExprField, r: &ExprField) -> bool {
+ l.is_placeholder == r.is_placeholder
+ && eq_id(l.ident, r.ident)
+ && eq_expr(&l.expr, &r.expr)
+ && over(&l.attrs, &r.attrs, eq_attr)
+}
+
+pub fn eq_arm(l: &Arm, r: &Arm) -> bool {
+ l.is_placeholder == r.is_placeholder
+ && eq_pat(&l.pat, &r.pat)
+ && eq_expr(&l.body, &r.body)
+ && eq_expr_opt(&l.guard, &r.guard)
+ && over(&l.attrs, &r.attrs, eq_attr)
+}
+
+pub fn eq_label(l: &Option<Label>, r: &Option<Label>) -> bool {
+ both(l, r, |l, r| eq_id(l.ident, r.ident))
+}
+
+pub fn eq_block(l: &Block, r: &Block) -> bool {
+ l.rules == r.rules && over(&l.stmts, &r.stmts, eq_stmt)
+}
+
+pub fn eq_stmt(l: &Stmt, r: &Stmt) -> bool {
+ use StmtKind::*;
+ match (&l.kind, &r.kind) {
+ (Local(l), Local(r)) => {
+ eq_pat(&l.pat, &r.pat)
+ && both(&l.ty, &r.ty, |l, r| eq_ty(l, r))
+ && eq_local_kind(&l.kind, &r.kind)
+ && over(&l.attrs, &r.attrs, eq_attr)
+ },
+ (Item(l), Item(r)) => eq_item(l, r, eq_item_kind),
+ (Expr(l), Expr(r)) | (Semi(l), Semi(r)) => eq_expr(l, r),
+ (Empty, Empty) => true,
+ (MacCall(l), MacCall(r)) => {
+ l.style == r.style && eq_mac_call(&l.mac, &r.mac) && over(&l.attrs, &r.attrs, eq_attr)
+ },
+ _ => false,
+ }
+}
+
+pub fn eq_local_kind(l: &LocalKind, r: &LocalKind) -> bool {
+ use LocalKind::*;
+ match (l, r) {
+ (Decl, Decl) => true,
+ (Init(l), Init(r)) => eq_expr(l, r),
+ (InitElse(li, le), InitElse(ri, re)) => eq_expr(li, ri) && eq_block(le, re),
+ _ => false,
+ }
+}
+
+pub fn eq_item<K>(l: &Item<K>, r: &Item<K>, mut eq_kind: impl FnMut(&K, &K) -> bool) -> bool {
+ eq_id(l.ident, r.ident) && over(&l.attrs, &r.attrs, eq_attr) && eq_vis(&l.vis, &r.vis) && eq_kind(&l.kind, &r.kind)
+}
+
+#[allow(clippy::too_many_lines)] // Just a big match statement
+pub fn eq_item_kind(l: &ItemKind, r: &ItemKind) -> bool {
+ use ItemKind::*;
+ match (l, r) {
+ (ExternCrate(l), ExternCrate(r)) => l == r,
+ (Use(l), Use(r)) => eq_use_tree(l, r),
+ (Static(lt, lm, le), Static(rt, rm, re)) => lm == rm && eq_ty(lt, rt) && eq_expr_opt(le, re),
+ (Const(ld, lt, le), Const(rd, rt, re)) => eq_defaultness(*ld, *rd) && eq_ty(lt, rt) && eq_expr_opt(le, re),
+ (
+ Fn(box ast::Fn {
+ defaultness: ld,
+ sig: lf,
+ generics: lg,
+ body: lb,
+ }),
+ Fn(box ast::Fn {
+ defaultness: rd,
+ sig: rf,
+ generics: rg,
+ body: rb,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
+ },
+ (Mod(lu, lmk), Mod(ru, rmk)) => {
+ lu == ru
+ && match (lmk, rmk) {
+ (ModKind::Loaded(litems, linline, _), ModKind::Loaded(ritems, rinline, _)) => {
+ linline == rinline && over(litems, ritems, |l, r| eq_item(l, r, eq_item_kind))
+ },
+ (ModKind::Unloaded, ModKind::Unloaded) => true,
+ _ => false,
+ }
+ },
+ (ForeignMod(l), ForeignMod(r)) => {
+ both(&l.abi, &r.abi, eq_str_lit) && over(&l.items, &r.items, |l, r| eq_item(l, r, eq_foreign_item_kind))
+ },
+ (
+ TyAlias(box ast::TyAlias {
+ defaultness: ld,
+ generics: lg,
+ bounds: lb,
+ ty: lt,
+ }),
+ TyAlias(box ast::TyAlias {
+ defaultness: rd,
+ generics: rg,
+ bounds: rb,
+ ty: rt,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd)
+ && eq_generics(lg, rg)
+ && over(lb, rb, eq_generic_bound)
+ && both(lt, rt, |l, r| eq_ty(l, r))
+ },
+ (Enum(le, lg), Enum(re, rg)) => over(&le.variants, &re.variants, eq_variant) && eq_generics(lg, rg),
+ (Struct(lv, lg), Struct(rv, rg)) | (Union(lv, lg), Union(rv, rg)) => {
+ eq_variant_data(lv, rv) && eq_generics(lg, rg)
+ },
+ (
+ Trait(box ast::Trait {
+ is_auto: la,
+ unsafety: lu,
+ generics: lg,
+ bounds: lb,
+ items: li,
+ }),
+ Trait(box ast::Trait {
+ is_auto: ra,
+ unsafety: ru,
+ generics: rg,
+ bounds: rb,
+ items: ri,
+ }),
+ ) => {
+ la == ra
+ && matches!(lu, Unsafe::No) == matches!(ru, Unsafe::No)
+ && eq_generics(lg, rg)
+ && over(lb, rb, eq_generic_bound)
+ && over(li, ri, |l, r| eq_item(l, r, eq_assoc_item_kind))
+ },
+ (TraitAlias(lg, lb), TraitAlias(rg, rb)) => eq_generics(lg, rg) && over(lb, rb, eq_generic_bound),
+ (
+ Impl(box ast::Impl {
+ unsafety: lu,
+ polarity: lp,
+ defaultness: ld,
+ constness: lc,
+ generics: lg,
+ of_trait: lot,
+ self_ty: lst,
+ items: li,
+ }),
+ Impl(box ast::Impl {
+ unsafety: ru,
+ polarity: rp,
+ defaultness: rd,
+ constness: rc,
+ generics: rg,
+ of_trait: rot,
+ self_ty: rst,
+ items: ri,
+ }),
+ ) => {
+ matches!(lu, Unsafe::No) == matches!(ru, Unsafe::No)
+ && matches!(lp, ImplPolarity::Positive) == matches!(rp, ImplPolarity::Positive)
+ && eq_defaultness(*ld, *rd)
+ && matches!(lc, ast::Const::No) == matches!(rc, ast::Const::No)
+ && eq_generics(lg, rg)
+ && both(lot, rot, |l, r| eq_path(&l.path, &r.path))
+ && eq_ty(lst, rst)
+ && over(li, ri, |l, r| eq_item(l, r, eq_assoc_item_kind))
+ },
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ (MacroDef(l), MacroDef(r)) => l.macro_rules == r.macro_rules && eq_mac_args(&l.body, &r.body),
+ _ => false,
+ }
+}
+
+pub fn eq_foreign_item_kind(l: &ForeignItemKind, r: &ForeignItemKind) -> bool {
+ use ForeignItemKind::*;
+ match (l, r) {
+ (Static(lt, lm, le), Static(rt, rm, re)) => lm == rm && eq_ty(lt, rt) && eq_expr_opt(le, re),
+ (
+ Fn(box ast::Fn {
+ defaultness: ld,
+ sig: lf,
+ generics: lg,
+ body: lb,
+ }),
+ Fn(box ast::Fn {
+ defaultness: rd,
+ sig: rf,
+ generics: rg,
+ body: rb,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
+ },
+ (
+ TyAlias(box ast::TyAlias {
+ defaultness: ld,
+ generics: lg,
+ bounds: lb,
+ ty: lt,
+ }),
+ TyAlias(box ast::TyAlias {
+ defaultness: rd,
+ generics: rg,
+ bounds: rb,
+ ty: rt,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd)
+ && eq_generics(lg, rg)
+ && over(lb, rb, eq_generic_bound)
+ && both(lt, rt, |l, r| eq_ty(l, r))
+ },
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_assoc_item_kind(l: &AssocItemKind, r: &AssocItemKind) -> bool {
+ use AssocItemKind::*;
+ match (l, r) {
+ (Const(ld, lt, le), Const(rd, rt, re)) => eq_defaultness(*ld, *rd) && eq_ty(lt, rt) && eq_expr_opt(le, re),
+ (
+ Fn(box ast::Fn {
+ defaultness: ld,
+ sig: lf,
+ generics: lg,
+ body: lb,
+ }),
+ Fn(box ast::Fn {
+ defaultness: rd,
+ sig: rf,
+ generics: rg,
+ body: rb,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd) && eq_fn_sig(lf, rf) && eq_generics(lg, rg) && both(lb, rb, |l, r| eq_block(l, r))
+ },
+ (
+ TyAlias(box ast::TyAlias {
+ defaultness: ld,
+ generics: lg,
+ bounds: lb,
+ ty: lt,
+ }),
+ TyAlias(box ast::TyAlias {
+ defaultness: rd,
+ generics: rg,
+ bounds: rb,
+ ty: rt,
+ }),
+ ) => {
+ eq_defaultness(*ld, *rd)
+ && eq_generics(lg, rg)
+ && over(lb, rb, eq_generic_bound)
+ && both(lt, rt, |l, r| eq_ty(l, r))
+ },
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_variant(l: &Variant, r: &Variant) -> bool {
+ l.is_placeholder == r.is_placeholder
+ && over(&l.attrs, &r.attrs, eq_attr)
+ && eq_vis(&l.vis, &r.vis)
+ && eq_id(l.ident, r.ident)
+ && eq_variant_data(&l.data, &r.data)
+ && both(&l.disr_expr, &r.disr_expr, |l, r| eq_expr(&l.value, &r.value))
+}
+
+pub fn eq_variant_data(l: &VariantData, r: &VariantData) -> bool {
+ use VariantData::*;
+ match (l, r) {
+ (Unit(_), Unit(_)) => true,
+ (Struct(l, _), Struct(r, _)) | (Tuple(l, _), Tuple(r, _)) => over(l, r, eq_struct_field),
+ _ => false,
+ }
+}
+
+pub fn eq_struct_field(l: &FieldDef, r: &FieldDef) -> bool {
+ l.is_placeholder == r.is_placeholder
+ && over(&l.attrs, &r.attrs, eq_attr)
+ && eq_vis(&l.vis, &r.vis)
+ && both(&l.ident, &r.ident, |l, r| eq_id(*l, *r))
+ && eq_ty(&l.ty, &r.ty)
+}
+
+pub fn eq_fn_sig(l: &FnSig, r: &FnSig) -> bool {
+ eq_fn_decl(&l.decl, &r.decl) && eq_fn_header(&l.header, &r.header)
+}
+
+pub fn eq_fn_header(l: &FnHeader, r: &FnHeader) -> bool {
+ matches!(l.unsafety, Unsafe::No) == matches!(r.unsafety, Unsafe::No)
+ && l.asyncness.is_async() == r.asyncness.is_async()
+ && matches!(l.constness, Const::No) == matches!(r.constness, Const::No)
+ && eq_ext(&l.ext, &r.ext)
+}
+
+pub fn eq_generics(l: &Generics, r: &Generics) -> bool {
+ over(&l.params, &r.params, eq_generic_param)
+ && over(&l.where_clause.predicates, &r.where_clause.predicates, |l, r| {
+ eq_where_predicate(l, r)
+ })
+}
+
+pub fn eq_where_predicate(l: &WherePredicate, r: &WherePredicate) -> bool {
+ use WherePredicate::*;
+ match (l, r) {
+ (BoundPredicate(l), BoundPredicate(r)) => {
+ over(&l.bound_generic_params, &r.bound_generic_params, |l, r| {
+ eq_generic_param(l, r)
+ }) && eq_ty(&l.bounded_ty, &r.bounded_ty)
+ && over(&l.bounds, &r.bounds, eq_generic_bound)
+ },
+ (RegionPredicate(l), RegionPredicate(r)) => {
+ eq_id(l.lifetime.ident, r.lifetime.ident) && over(&l.bounds, &r.bounds, eq_generic_bound)
+ },
+ (EqPredicate(l), EqPredicate(r)) => eq_ty(&l.lhs_ty, &r.lhs_ty) && eq_ty(&l.rhs_ty, &r.rhs_ty),
+ _ => false,
+ }
+}
+
+pub fn eq_use_tree(l: &UseTree, r: &UseTree) -> bool {
+ eq_path(&l.prefix, &r.prefix) && eq_use_tree_kind(&l.kind, &r.kind)
+}
+
+pub fn eq_anon_const(l: &AnonConst, r: &AnonConst) -> bool {
+ eq_expr(&l.value, &r.value)
+}
+
+pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool {
+ use UseTreeKind::*;
+ match (l, r) {
+ (Glob, Glob) => true,
+ (Simple(l, _, _), Simple(r, _, _)) => both(l, r, |l, r| eq_id(*l, *r)),
+ (Nested(l), Nested(r)) => over(l, r, |(l, _), (r, _)| eq_use_tree(l, r)),
+ _ => false,
+ }
+}
+
+pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool {
+ matches!(
+ (l, r),
+ (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_))
+ )
+}
+
+pub fn eq_vis(l: &Visibility, r: &Visibility) -> bool {
+ use VisibilityKind::*;
+ match (&l.kind, &r.kind) {
+ (Public, Public) | (Inherited, Inherited) | (Crate(_), Crate(_)) => true,
+ (Restricted { path: l, .. }, Restricted { path: r, .. }) => eq_path(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_fn_decl(l: &FnDecl, r: &FnDecl) -> bool {
+ eq_fn_ret_ty(&l.output, &r.output)
+ && over(&l.inputs, &r.inputs, |l, r| {
+ l.is_placeholder == r.is_placeholder
+ && eq_pat(&l.pat, &r.pat)
+ && eq_ty(&l.ty, &r.ty)
+ && over(&l.attrs, &r.attrs, eq_attr)
+ })
+}
+
+pub fn eq_fn_ret_ty(l: &FnRetTy, r: &FnRetTy) -> bool {
+ match (l, r) {
+ (FnRetTy::Default(_), FnRetTy::Default(_)) => true,
+ (FnRetTy::Ty(l), FnRetTy::Ty(r)) => eq_ty(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_ty(l: &Ty, r: &Ty) -> bool {
+ use TyKind::*;
+ match (&l.kind, &r.kind) {
+ (Paren(l), _) => eq_ty(l, r),
+ (_, Paren(r)) => eq_ty(l, r),
+ (Never, Never) | (Infer, Infer) | (ImplicitSelf, ImplicitSelf) | (Err, Err) | (CVarArgs, CVarArgs) => true,
+ (Slice(l), Slice(r)) => eq_ty(l, r),
+ (Array(le, ls), Array(re, rs)) => eq_ty(le, re) && eq_expr(&ls.value, &rs.value),
+ (Ptr(l), Ptr(r)) => l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty),
+ (Rptr(ll, l), Rptr(rl, r)) => {
+ both(ll, rl, |l, r| eq_id(l.ident, r.ident)) && l.mutbl == r.mutbl && eq_ty(&l.ty, &r.ty)
+ },
+ (BareFn(l), BareFn(r)) => {
+ l.unsafety == r.unsafety
+ && eq_ext(&l.ext, &r.ext)
+ && over(&l.generic_params, &r.generic_params, eq_generic_param)
+ && eq_fn_decl(&l.decl, &r.decl)
+ },
+ (Tup(l), Tup(r)) => over(l, r, |l, r| eq_ty(l, r)),
+ (Path(lq, lp), Path(rq, rp)) => both(lq, rq, eq_qself) && eq_path(lp, rp),
+ (TraitObject(lg, ls), TraitObject(rg, rs)) => ls == rs && over(lg, rg, eq_generic_bound),
+ (ImplTrait(_, lg), ImplTrait(_, rg)) => over(lg, rg, eq_generic_bound),
+ (Typeof(l), Typeof(r)) => eq_expr(&l.value, &r.value),
+ (MacCall(l), MacCall(r)) => eq_mac_call(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_ext(l: &Extern, r: &Extern) -> bool {
+ use Extern::*;
+ match (l, r) {
+ (None, None) | (Implicit, Implicit) => true,
+ (Explicit(l), Explicit(r)) => eq_str_lit(l, r),
+ _ => false,
+ }
+}
+
+pub fn eq_str_lit(l: &StrLit, r: &StrLit) -> bool {
+ l.style == r.style && l.symbol == r.symbol && l.suffix == r.suffix
+}
+
+pub fn eq_poly_ref_trait(l: &PolyTraitRef, r: &PolyTraitRef) -> bool {
+ eq_path(&l.trait_ref.path, &r.trait_ref.path)
+ && over(&l.bound_generic_params, &r.bound_generic_params, |l, r| {
+ eq_generic_param(l, r)
+ })
+}
+
+pub fn eq_generic_param(l: &GenericParam, r: &GenericParam) -> bool {
+ use GenericParamKind::*;
+ l.is_placeholder == r.is_placeholder
+ && eq_id(l.ident, r.ident)
+ && over(&l.bounds, &r.bounds, eq_generic_bound)
+ && match (&l.kind, &r.kind) {
+ (Lifetime, Lifetime) => true,
+ (Type { default: l }, Type { default: r }) => both(l, r, |l, r| eq_ty(l, r)),
+ (
+ Const {
+ ty: lt,
+ kw_span: _,
+ default: ld,
+ },
+ Const {
+ ty: rt,
+ kw_span: _,
+ default: rd,
+ },
+ ) => eq_ty(lt, rt) && both(ld, rd, eq_anon_const),
+ _ => false,
+ }
+ && over(&l.attrs, &r.attrs, eq_attr)
+}
+
+pub fn eq_generic_bound(l: &GenericBound, r: &GenericBound) -> bool {
+ use GenericBound::*;
+ match (l, r) {
+ (Trait(ptr1, tbm1), Trait(ptr2, tbm2)) => tbm1 == tbm2 && eq_poly_ref_trait(ptr1, ptr2),
+ (Outlives(l), Outlives(r)) => eq_id(l.ident, r.ident),
+ _ => false,
+ }
+}
+
+fn eq_term(l: &Term, r: &Term) -> bool {
++ match (l, r) {
++ (Term::Ty(l), Term::Ty(r)) => eq_ty(l, r),
++ (Term::Const(l), Term::Const(r)) => eq_anon_const(l, r),
++ _ => false,
++ }
+}
+
+pub fn eq_assoc_constraint(l: &AssocConstraint, r: &AssocConstraint) -> bool {
+ use AssocConstraintKind::*;
+ eq_id(l.ident, r.ident)
+ && match (&l.kind, &r.kind) {
+ (Equality { term: l }, Equality { term: r }) => eq_term(l, r),
+ (Bound { bounds: l }, Bound { bounds: r }) => over(l, r, eq_generic_bound),
+ _ => false,
+ }
+}
+
+pub fn eq_mac_call(l: &MacCall, r: &MacCall) -> bool {
+ eq_path(&l.path, &r.path) && eq_mac_args(&l.args, &r.args)
+}
+
+pub fn eq_attr(l: &Attribute, r: &Attribute) -> bool {
+ use AttrKind::*;
+ l.style == r.style
+ && match (&l.kind, &r.kind) {
+ (DocComment(l1, l2), DocComment(r1, r2)) => l1 == r1 && l2 == r2,
+ (Normal(l, _), Normal(r, _)) => eq_path(&l.path, &r.path) && eq_mac_args(&l.args, &r.args),
+ _ => false,
+ }
+}
+
+pub fn eq_mac_args(l: &MacArgs, r: &MacArgs) -> bool {
+ use MacArgs::*;
+ match (l, r) {
+ (Empty, Empty) => true,
+ (Delimited(_, ld, lts), Delimited(_, rd, rts)) => ld == rd && lts.eq_unspanned(rts),
+ (Eq(_, lt), Eq(_, rt)) => lt.kind == rt.kind,
+ _ => false,
+ }
+}
--- /dev/null
- pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
+#![feature(box_patterns)]
+#![feature(control_flow_enum)]
+#![feature(let_else)]
+#![feature(once_cell)]
+#![feature(rustc_private)]
+#![recursion_limit = "512"]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![allow(clippy::missing_errors_doc, clippy::missing_panics_doc, clippy::must_use_candidate)]
+// warn on the same lints as `clippy_lints`
+#![warn(trivial_casts, trivial_numeric_casts)]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_ast;
+extern crate rustc_ast_pretty;
+extern crate rustc_attr;
+extern crate rustc_data_structures;
+extern crate rustc_errors;
+extern crate rustc_hir;
+extern crate rustc_infer;
+extern crate rustc_lexer;
+extern crate rustc_lint;
+extern crate rustc_middle;
+extern crate rustc_session;
+extern crate rustc_span;
+extern crate rustc_target;
+extern crate rustc_trait_selection;
+extern crate rustc_typeck;
+
+#[macro_use]
+pub mod sym_helper;
+
+#[allow(clippy::module_name_repetitions)]
+pub mod ast_utils;
+pub mod attrs;
+pub mod comparisons;
+pub mod consts;
+pub mod diagnostics;
+pub mod eager_or_lazy;
+pub mod higher;
+mod hir_utils;
+pub mod macros;
+pub mod msrvs;
+pub mod numeric_literal;
+pub mod paths;
+pub mod ptr;
+pub mod qualify_min_const_fn;
+pub mod source;
+pub mod str_utils;
+pub mod sugg;
+pub mod ty;
+pub mod usage;
+pub mod visitors;
+
+pub use self::attrs::*;
+pub use self::hir_utils::{both, count_eq, eq_expr_value, over, SpanlessEq, SpanlessHash};
+
+use std::collections::hash_map::Entry;
+use std::hash::BuildHasherDefault;
+use std::lazy::SyncOnceCell;
+use std::sync::{Mutex, MutexGuard};
+
+use if_chain::if_chain;
+use rustc_ast::ast::{self, Attribute, LitKind};
+use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::unhash::UnhashMap;
+use rustc_hir as hir;
+use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_ID};
+use rustc_hir::hir_id::{HirIdMap, HirIdSet};
+use rustc_hir::intravisit::{walk_expr, FnKind, Visitor};
+use rustc_hir::itemlikevisit::ItemLikeVisitor;
+use rustc_hir::LangItem::{OptionNone, ResultErr, ResultOk};
+use rustc_hir::{
+ def, lang_items, Arm, ArrayLen, BindingAnnotation, Block, BlockCheckMode, Body, Constness, Destination, Expr,
+ ExprKind, FnDecl, ForeignItem, GenericArgs, HirId, Impl, ImplItem, ImplItemKind, IsAsync, Item, ItemKind, LangItem,
+ Local, MatchSource, Mutability, Node, Param, Pat, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind,
+ Target, TraitItem, TraitItemKind, TraitRef, TyKind, UnOp,
+};
+use rustc_lint::{LateContext, Level, Lint, LintContext};
+use rustc_middle::hir::place::PlaceBase;
+use rustc_middle::ty as rustc_ty;
+use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
+use rustc_middle::ty::binding::BindingMode;
+use rustc_middle::ty::{layout::IntegerExt, BorrowKind, DefIdTree, Ty, TyCtxt, TypeAndMut, TypeFoldable, UpvarCapture};
+use rustc_semver::RustcVersion;
+use rustc_session::Session;
+use rustc_span::hygiene::{ExpnKind, MacroKind};
+use rustc_span::source_map::original_sp;
+use rustc_span::sym;
+use rustc_span::symbol::{kw, Symbol};
+use rustc_span::{Span, DUMMY_SP};
+use rustc_target::abi::Integer;
+
+use crate::consts::{constant, Constant};
+use crate::ty::{can_partially_move_ty, is_copy, is_recursively_primitive_type};
+use crate::visitors::expr_visitor_no_bodies;
+
+pub fn parse_msrv(msrv: &str, sess: Option<&Session>, span: Option<Span>) -> Option<RustcVersion> {
+ if let Ok(version) = RustcVersion::parse(msrv) {
+ return Some(version);
+ } else if let Some(sess) = sess {
+ if let Some(span) = span {
+ sess.span_err(span, &format!("`{}` is not a valid Rust version", msrv));
+ }
+ }
+ None
+}
+
+pub fn meets_msrv(msrv: Option<&RustcVersion>, lint_msrv: &RustcVersion) -> bool {
+ msrv.map_or(true, |msrv| msrv.meets(*lint_msrv))
+}
+
+#[macro_export]
+macro_rules! extract_msrv_attr {
+ ($context:ident) => {
+ fn enter_lint_attrs(&mut self, cx: &rustc_lint::$context<'_>, attrs: &[rustc_ast::ast::Attribute]) {
+ let sess = rustc_lint::LintContext::sess(cx);
+ match $crate::get_unique_inner_attr(sess, attrs, "msrv") {
+ Some(msrv_attr) => {
+ if let Some(msrv) = msrv_attr.value_str() {
+ self.msrv = $crate::parse_msrv(&msrv.to_string(), Some(sess), Some(msrv_attr.span));
+ } else {
+ sess.span_err(msrv_attr.span, "bad clippy attribute");
+ }
+ },
+ _ => (),
+ }
+ }
+ };
+}
+
+/// Returns `true` if the two spans come from differing expansions (i.e., one is
+/// from a macro and one isn't).
+#[must_use]
+pub fn differing_macro_contexts(lhs: Span, rhs: Span) -> bool {
+ rhs.ctxt() != lhs.ctxt()
+}
+
+/// If the given expression is a local binding, find the initializer expression.
+/// If that initializer expression is another local binding, find its initializer again.
+/// This process repeats as long as possible (but usually no more than once). Initializer
+/// expressions with adjustments are ignored. If this is not desired, use [`find_binding_init`]
+/// instead.
+///
+/// Examples:
+/// ```
+/// let abc = 1;
+/// // ^ output
+/// let def = abc;
+/// dbg!(def);
+/// // ^^^ input
+///
+/// // or...
+/// let abc = 1;
+/// let def = abc + 2;
+/// // ^^^^^^^ output
+/// dbg!(def);
+/// // ^^^ input
+/// ```
+pub fn expr_or_init<'a, 'b, 'tcx: 'b>(cx: &LateContext<'tcx>, mut expr: &'a Expr<'b>) -> &'a Expr<'b> {
+ while let Some(init) = path_to_local(expr)
+ .and_then(|id| find_binding_init(cx, id))
+ .filter(|init| cx.typeck_results().expr_adjustments(init).is_empty())
+ {
+ expr = init;
+ }
+ expr
+}
+
+/// Finds the initializer expression for a local binding. Returns `None` if the binding is mutable.
+/// By only considering immutable bindings, we guarantee that the returned expression represents the
+/// value of the binding wherever it is referenced.
+///
+/// Example: For `let x = 1`, if the `HirId` of `x` is provided, the `Expr` `1` is returned.
+/// Note: If you have an expression that references a binding `x`, use `path_to_local` to get the
+/// canonical binding `HirId`.
+pub fn find_binding_init<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Expr<'tcx>> {
+ let hir = cx.tcx.hir();
+ if_chain! {
+ if let Some(Node::Binding(pat)) = hir.find(hir_id);
+ if matches!(pat.kind, PatKind::Binding(BindingAnnotation::Unannotated, ..));
+ let parent = hir.get_parent_node(hir_id);
+ if let Some(Node::Local(local)) = hir.find(parent);
+ then {
+ return local.init;
+ }
+ }
+ None
+}
+
+/// Returns `true` if the given `NodeId` is inside a constant context
+///
+/// # Example
+///
+/// ```rust,ignore
+/// if in_constant(cx, expr.hir_id) {
+/// // Do something
+/// }
+/// ```
+pub fn in_constant(cx: &LateContext<'_>, id: HirId) -> bool {
+ let parent_id = cx.tcx.hir().get_parent_item(id);
+ match cx.tcx.hir().get_by_def_id(parent_id) {
+ Node::Item(&Item {
+ kind: ItemKind::Const(..) | ItemKind::Static(..),
+ ..
+ })
+ | Node::TraitItem(&TraitItem {
+ kind: TraitItemKind::Const(..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Const(..),
+ ..
+ })
+ | Node::AnonConst(_) => true,
+ Node::Item(&Item {
+ kind: ItemKind::Fn(ref sig, ..),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(ref sig, _),
+ ..
+ }) => sig.header.constness == Constness::Const,
+ _ => false,
+ }
+}
+
+/// Checks if a `QPath` resolves to a constructor of a `LangItem`.
+/// For example, use this to check whether a function call or a pattern is `Some(..)`.
+pub fn is_lang_ctor(cx: &LateContext<'_>, qpath: &QPath<'_>, lang_item: LangItem) -> bool {
+ if let QPath::Resolved(_, path) = qpath {
+ if let Res::Def(DefKind::Ctor(..), ctor_id) = path.res {
+ if let Ok(item_id) = cx.tcx.lang_items().require(lang_item) {
+ return cx.tcx.parent(ctor_id) == Some(item_id);
+ }
+ }
+ }
+ false
+}
+
+pub fn is_unit_expr(expr: &Expr<'_>) -> bool {
+ matches!(
+ expr.kind,
+ ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: None,
+ ..
+ },
+ _
+ ) | ExprKind::Tup([])
+ )
+}
+
+/// Checks if given pattern is a wildcard (`_`)
+pub fn is_wild(pat: &Pat<'_>) -> bool {
+ matches!(pat.kind, PatKind::Wild)
+}
+
+/// Checks if the first type parameter is a lang item.
+pub fn is_ty_param_lang_item<'tcx>(
+ cx: &LateContext<'_>,
+ qpath: &QPath<'tcx>,
+ item: LangItem,
+) -> Option<&'tcx hir::Ty<'tcx>> {
+ let ty = get_qpath_generic_tys(qpath).next()?;
+
+ if let TyKind::Path(qpath) = &ty.kind {
+ cx.qpath_res(qpath, ty.hir_id)
+ .opt_def_id()
+ .map_or(false, |id| {
+ cx.tcx.lang_items().require(item).map_or(false, |lang_id| id == lang_id)
+ })
+ .then(|| ty)
+ } else {
+ None
+ }
+}
+
+/// Checks if the first type parameter is a diagnostic item.
+pub fn is_ty_param_diagnostic_item<'tcx>(
+ cx: &LateContext<'_>,
+ qpath: &QPath<'tcx>,
+ item: Symbol,
+) -> Option<&'tcx hir::Ty<'tcx>> {
+ let ty = get_qpath_generic_tys(qpath).next()?;
+
+ if let TyKind::Path(qpath) = &ty.kind {
+ cx.qpath_res(qpath, ty.hir_id)
+ .opt_def_id()
+ .map_or(false, |id| cx.tcx.is_diagnostic_item(item, id))
+ .then(|| ty)
+ } else {
+ None
+ }
+}
+
+/// Checks if the method call given in `expr` belongs to the given trait.
+/// This is a deprecated function, consider using [`is_trait_method`].
+pub fn match_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, path: &[&str]) -> bool {
+ let def_id = cx.typeck_results().type_dependent_def_id(expr.hir_id).unwrap();
+ let trt_id = cx.tcx.trait_of_item(def_id);
+ trt_id.map_or(false, |trt_id| match_def_path(cx, trt_id, path))
+}
+
+/// Checks if a method is defined in an impl of a diagnostic item
+pub fn is_diag_item_method(cx: &LateContext<'_>, def_id: DefId, diag_item: Symbol) -> bool {
+ if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
+ if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
+ return cx.tcx.is_diagnostic_item(diag_item, adt.did);
+ }
+ }
+ false
+}
+
+/// Checks if a method is in a diagnostic item trait
+pub fn is_diag_trait_item(cx: &LateContext<'_>, def_id: DefId, diag_item: Symbol) -> bool {
+ if let Some(trait_did) = cx.tcx.trait_of_item(def_id) {
+ return cx.tcx.is_diagnostic_item(diag_item, trait_did);
+ }
+ false
+}
+
+/// Checks if the method call given in `expr` belongs to the given trait.
+pub fn is_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ cx.typeck_results()
+ .type_dependent_def_id(expr.hir_id)
+ .map_or(false, |did| is_diag_trait_item(cx, did, diag_item))
+}
+
+/// Checks if the given expression is a path referring an item on the trait
+/// that is marked with the given diagnostic item.
+///
+/// For checking method call expressions instead of path expressions, use
+/// [`is_trait_method`].
+///
+/// For example, this can be used to find if an expression like `u64::default`
+/// refers to an item of the trait `Default`, which is associated with the
+/// `diag_item` of `sym::Default`.
+pub fn is_trait_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ if let hir::ExprKind::Path(ref qpath) = expr.kind {
+ cx.qpath_res(qpath, expr.hir_id)
+ .opt_def_id()
+ .map_or(false, |def_id| is_diag_trait_item(cx, def_id, diag_item))
+ } else {
+ false
+ }
+}
+
+pub fn last_path_segment<'tcx>(path: &QPath<'tcx>) -> &'tcx PathSegment<'tcx> {
+ match *path {
+ QPath::Resolved(_, path) => path.segments.last().expect("A path must have at least one segment"),
+ QPath::TypeRelative(_, seg) => seg,
+ QPath::LangItem(..) => panic!("last_path_segment: lang item has no path segments"),
+ }
+}
+
+pub fn get_qpath_generics<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx GenericArgs<'tcx>> {
+ match path {
+ QPath::Resolved(_, p) => p.segments.last().and_then(|s| s.args),
+ QPath::TypeRelative(_, s) => s.args,
+ QPath::LangItem(..) => None,
+ }
+}
+
+pub fn get_qpath_generic_tys<'tcx>(path: &QPath<'tcx>) -> impl Iterator<Item = &'tcx hir::Ty<'tcx>> {
+ get_qpath_generics(path)
+ .map_or([].as_ref(), |a| a.args)
+ .iter()
+ .filter_map(|a| {
+ if let hir::GenericArg::Type(ty) = a {
+ Some(ty)
+ } else {
+ None
+ }
+ })
+}
+
+pub fn single_segment_path<'tcx>(path: &QPath<'tcx>) -> Option<&'tcx PathSegment<'tcx>> {
+ match *path {
+ QPath::Resolved(_, path) => path.segments.get(0),
+ QPath::TypeRelative(_, seg) => Some(seg),
+ QPath::LangItem(..) => None,
+ }
+}
+
+/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
+/// entire path or resolved `DefId`. Prefer using `match_def_path`. Consider getting a `DefId` from
+/// `QPath::Resolved.1.res.opt_def_id()`.
+///
+/// Matches a `QPath` against a slice of segment string literals.
+///
+/// There is also `match_path` if you are dealing with a `rustc_hir::Path` instead of a
+/// `rustc_hir::QPath`.
+///
+/// # Examples
+/// ```rust,ignore
+/// match_qpath(path, &["std", "rt", "begin_unwind"])
+/// ```
+pub fn match_qpath(path: &QPath<'_>, segments: &[&str]) -> bool {
+ match *path {
+ QPath::Resolved(_, path) => match_path(path, segments),
+ QPath::TypeRelative(ty, segment) => match ty.kind {
+ TyKind::Path(ref inner_path) => {
+ if let [prefix @ .., end] = segments {
+ if match_qpath(inner_path, prefix) {
+ return segment.ident.name.as_str() == *end;
+ }
+ }
+ false
+ },
+ _ => false,
+ },
+ QPath::LangItem(..) => false,
+ }
+}
+
+/// If the expression is a path, resolve it. Otherwise, return `Res::Err`.
+pub fn expr_path_res(cx: &LateContext<'_>, expr: &Expr<'_>) -> Res {
+ if let ExprKind::Path(p) = &expr.kind {
+ cx.qpath_res(p, expr.hir_id)
+ } else {
+ Res::Err
+ }
+}
+
+/// Resolves the path to a `DefId` and checks if it matches the given path.
+pub fn is_qpath_def_path(cx: &LateContext<'_>, path: &QPath<'_>, hir_id: HirId, segments: &[&str]) -> bool {
+ cx.qpath_res(path, hir_id)
+ .opt_def_id()
+ .map_or(false, |id| match_def_path(cx, id, segments))
+}
+
+/// If the expression is a path, resolves it to a `DefId` and checks if it matches the given path.
+///
+/// Please use `is_expr_diagnostic_item` if the target is a diagnostic item.
+pub fn is_expr_path_def_path(cx: &LateContext<'_>, expr: &Expr<'_>, segments: &[&str]) -> bool {
+ expr_path_res(cx, expr)
+ .opt_def_id()
+ .map_or(false, |id| match_def_path(cx, id, segments))
+}
+
+/// If the expression is a path, resolves it to a `DefId` and checks if it matches the given
+/// diagnostic item.
+pub fn is_expr_diagnostic_item(cx: &LateContext<'_>, expr: &Expr<'_>, diag_item: Symbol) -> bool {
+ expr_path_res(cx, expr)
+ .opt_def_id()
+ .map_or(false, |id| cx.tcx.is_diagnostic_item(diag_item, id))
+}
+
+/// THIS METHOD IS DEPRECATED and will eventually be removed since it does not match against the
+/// entire path or resolved `DefId`. Prefer using `match_def_path`. Consider getting a `DefId` from
+/// `QPath::Resolved.1.res.opt_def_id()`.
+///
+/// Matches a `Path` against a slice of segment string literals.
+///
+/// There is also `match_qpath` if you are dealing with a `rustc_hir::QPath` instead of a
+/// `rustc_hir::Path`.
+///
+/// # Examples
+///
+/// ```rust,ignore
+/// if match_path(&trait_ref.path, &paths::HASH) {
+/// // This is the `std::hash::Hash` trait.
+/// }
+///
+/// if match_path(ty_path, &["rustc", "lint", "Lint"]) {
+/// // This is a `rustc_middle::lint::Lint`.
+/// }
+/// ```
+pub fn match_path(path: &Path<'_>, segments: &[&str]) -> bool {
+ path.segments
+ .iter()
+ .rev()
+ .zip(segments.iter().rev())
+ .all(|(a, b)| a.ident.name.as_str() == *b)
+}
+
+/// If the expression is a path to a local, returns the canonical `HirId` of the local.
+pub fn path_to_local(expr: &Expr<'_>) -> Option<HirId> {
+ if let ExprKind::Path(QPath::Resolved(None, path)) = expr.kind {
+ if let Res::Local(id) = path.res {
+ return Some(id);
+ }
+ }
+ None
+}
+
+/// Returns true if the expression is a path to a local with the specified `HirId`.
+/// Use this function to see if an expression matches a function argument or a match binding.
+pub fn path_to_local_id(expr: &Expr<'_>, id: HirId) -> bool {
+ path_to_local(expr) == Some(id)
+}
+
+/// Gets the definition associated to a path.
+pub fn path_to_res(cx: &LateContext<'_>, path: &[&str]) -> Res {
+ macro_rules! try_res {
+ ($e:expr) => {
+ match $e {
+ Some(e) => e,
+ None => return Res::Err,
+ }
+ };
+ }
+ fn item_child_by_name(tcx: TyCtxt<'_>, def_id: DefId, name: &str) -> Option<Res> {
+ match tcx.def_kind(def_id) {
+ DefKind::Mod | DefKind::Enum | DefKind::Trait => tcx
+ .module_children(def_id)
+ .iter()
+ .find(|item| item.ident.name.as_str() == name)
+ .map(|child| child.res.expect_non_local()),
+ DefKind::Impl => tcx
+ .associated_item_def_ids(def_id)
+ .iter()
+ .copied()
+ .find(|assoc_def_id| tcx.item_name(*assoc_def_id).as_str() == name)
+ .map(|assoc_def_id| Res::Def(tcx.def_kind(assoc_def_id), assoc_def_id)),
+ _ => None,
+ }
+ }
+ fn find_primitive(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
+ if let Some(&(index, Target::Impl)) = lang_items::ITEM_REFS.get(&Symbol::intern(name)) {
+ tcx.lang_items().items()[index]
+ } else {
+ None
+ }
+ }
+ fn find_crate(tcx: TyCtxt<'_>, name: &str) -> Option<DefId> {
+ tcx.crates(())
+ .iter()
+ .find(|&&num| tcx.crate_name(num).as_str() == name)
+ .map(CrateNum::as_def_id)
+ }
+
+ let (base, first, path) = match *path {
+ [base, first, ref path @ ..] => (base, first, path),
+ [primitive] => {
+ return PrimTy::from_name(Symbol::intern(primitive)).map_or(Res::Err, Res::PrimTy);
+ },
+ _ => return Res::Err,
+ };
+ let tcx = cx.tcx;
+ let first = try_res!(
+ find_primitive(tcx, base)
+ .or_else(|| find_crate(tcx, base))
+ .and_then(|id| item_child_by_name(tcx, id, first))
+ );
+
+ let last = path
+ .iter()
+ .copied()
+ // for each segment, find the child item
+ .try_fold(first, |res, segment| {
+ let def_id = res.def_id();
+ if let Some(item) = item_child_by_name(tcx, def_id, segment) {
+ Some(item)
+ } else if matches!(res, Res::Def(DefKind::Enum | DefKind::Struct, _)) {
+ // it is not a child item so check inherent impl items
+ tcx.inherent_impls(def_id)
+ .iter()
+ .find_map(|&impl_def_id| item_child_by_name(tcx, impl_def_id, segment))
+ } else {
+ None
+ }
+ });
+ try_res!(last).expect_non_local()
+}
+
+/// Convenience function to get the `DefId` of a trait by path.
+/// It could be a trait or trait alias.
+pub fn get_trait_def_id(cx: &LateContext<'_>, path: &[&str]) -> Option<DefId> {
+ match path_to_res(cx, path) {
+ Res::Def(DefKind::Trait | DefKind::TraitAlias, trait_id) => Some(trait_id),
+ _ => None,
+ }
+}
+
+/// Gets the `hir::TraitRef` of the trait the given method is implemented for.
+///
+/// Use this if you want to find the `TraitRef` of the `Add` trait in this example:
+///
+/// ```rust
+/// struct Point(isize, isize);
+///
+/// impl std::ops::Add for Point {
+/// type Output = Self;
+///
+/// fn add(self, other: Self) -> Self {
+/// Point(0, 0)
+/// }
+/// }
+/// ```
+pub fn trait_ref_of_method<'tcx>(cx: &LateContext<'tcx>, def_id: LocalDefId) -> Option<&'tcx TraitRef<'tcx>> {
+ // Get the implemented trait for the current function
+ let hir_id = cx.tcx.hir().local_def_id_to_hir_id(def_id);
+ let parent_impl = cx.tcx.hir().get_parent_item(hir_id);
+ if_chain! {
+ if parent_impl != CRATE_DEF_ID;
+ if let hir::Node::Item(item) = cx.tcx.hir().get_by_def_id(parent_impl);
+ if let hir::ItemKind::Impl(impl_) = &item.kind;
+ then { return impl_.of_trait.as_ref(); }
+ }
+ None
+}
+
+/// This method will return tuple of projection stack and root of the expression,
+/// used in `can_mut_borrow_both`.
+///
+/// For example, if `e` represents the `v[0].a.b[x]`
+/// this method will return a tuple, composed of a `Vec`
+/// containing the `Expr`s for `v[0], v[0].a, v[0].a.b, v[0].a.b[x]`
+/// and an `Expr` for root of them, `v`
+fn projection_stack<'a, 'hir>(mut e: &'a Expr<'hir>) -> (Vec<&'a Expr<'hir>>, &'a Expr<'hir>) {
+ let mut result = vec![];
+ let root = loop {
+ match e.kind {
+ ExprKind::Index(ep, _) | ExprKind::Field(ep, _) => {
+ result.push(e);
+ e = ep;
+ },
+ _ => break e,
+ };
+ };
+ result.reverse();
+ (result, root)
+}
+
+/// Gets the mutability of the custom deref adjustment, if any.
+pub fn expr_custom_deref_adjustment(cx: &LateContext<'_>, e: &Expr<'_>) -> Option<Mutability> {
+ cx.typeck_results()
+ .expr_adjustments(e)
+ .iter()
+ .find_map(|a| match a.kind {
+ Adjust::Deref(Some(d)) => Some(Some(d.mutbl)),
+ Adjust::Deref(None) => None,
+ _ => Some(None),
+ })
+ .and_then(|x| x)
+}
+
+/// Checks if two expressions can be mutably borrowed simultaneously
+/// and they aren't dependent on borrowing same thing twice
+pub fn can_mut_borrow_both(cx: &LateContext<'_>, e1: &Expr<'_>, e2: &Expr<'_>) -> bool {
+ let (s1, r1) = projection_stack(e1);
+ let (s2, r2) = projection_stack(e2);
+ if !eq_expr_value(cx, r1, r2) {
+ return true;
+ }
+ if expr_custom_deref_adjustment(cx, r1).is_some() || expr_custom_deref_adjustment(cx, r2).is_some() {
+ return false;
+ }
+
+ for (x1, x2) in s1.iter().zip(s2.iter()) {
+ if expr_custom_deref_adjustment(cx, x1).is_some() || expr_custom_deref_adjustment(cx, x2).is_some() {
+ return false;
+ }
+
+ match (&x1.kind, &x2.kind) {
+ (ExprKind::Field(_, i1), ExprKind::Field(_, i2)) => {
+ if i1 != i2 {
+ return true;
+ }
+ },
+ (ExprKind::Index(_, i1), ExprKind::Index(_, i2)) => {
+ if !eq_expr_value(cx, i1, i2) {
+ return false;
+ }
+ },
+ _ => return false,
+ }
+ }
+ false
+}
+
+/// Returns true if the `def_id` associated with the `path` is recognized as a "default-equivalent"
+/// constructor from the std library
+fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<'_>) -> bool {
+ let std_types_symbols = &[
+ sym::String,
+ sym::Vec,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::HashMap,
+ sym::BTreeMap,
+ sym::HashSet,
+ sym::BTreeSet,
+ sym::BinaryHeap,
+ ];
+
+ if let QPath::TypeRelative(_, method) = path {
+ if method.ident.name == sym::new {
+ if let Some(impl_did) = cx.tcx.impl_of_method(def_id) {
+ if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
+ return std_types_symbols
+ .iter()
+ .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did));
+ }
+ }
+ }
+ }
+ false
+}
+
+/// Return true if the expr is equal to `Default::default` when evaluated.
+pub fn is_default_equivalent_call(cx: &LateContext<'_>, repl_func: &Expr<'_>) -> bool {
+ if_chain! {
+ if let hir::ExprKind::Path(ref repl_func_qpath) = repl_func.kind;
+ if let Some(repl_def_id) = cx.qpath_res(repl_func_qpath, repl_func.hir_id).opt_def_id();
+ if is_diag_trait_item(cx, repl_def_id, sym::Default)
+ || is_default_equivalent_ctor(cx, repl_def_id, repl_func_qpath);
+ then {
+ true
+ }
+ else {
+ false
+ }
+ }
+}
+
+/// Returns true if the expr is equal to `Default::default()` of it's type when evaluated.
+/// It doesn't cover all cases, for example indirect function calls (some of std
+/// functions are supported) but it is the best we have.
+pub fn is_default_equivalent(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ match &e.kind {
+ ExprKind::Lit(lit) => match lit.node {
+ LitKind::Bool(false) | LitKind::Int(0, _) => true,
+ LitKind::Str(s, _) => s.is_empty(),
+ _ => false,
+ },
+ ExprKind::Tup(items) | ExprKind::Array(items) => items.iter().all(|x| is_default_equivalent(cx, x)),
+ ExprKind::Repeat(x, ArrayLen::Body(len)) => if_chain! {
+ if let ExprKind::Lit(ref const_lit) = cx.tcx.hir().body(len.body).value.kind;
+ if let LitKind::Int(v, _) = const_lit.node;
+ if v <= 32 && is_default_equivalent(cx, x);
+ then {
+ true
+ }
+ else {
+ false
+ }
+ },
+ ExprKind::Call(repl_func, _) => is_default_equivalent_call(cx, repl_func),
+ ExprKind::Path(qpath) => is_lang_ctor(cx, qpath, OptionNone),
+ ExprKind::AddrOf(rustc_hir::BorrowKind::Ref, _, expr) => matches!(expr.kind, ExprKind::Array([])),
+ _ => false,
+ }
+}
+
+/// Checks if the top level expression can be moved into a closure as is.
+/// Currently checks for:
+/// * Break/Continue outside the given loop HIR ids.
+/// * Yield/Return statements.
+/// * Inline assembly.
+/// * Usages of a field of a local where the type of the local can be partially moved.
+///
+/// For example, given the following function:
+///
+/// ```
+/// fn f<'a>(iter: &mut impl Iterator<Item = (usize, &'a mut String)>) {
+/// for item in iter {
+/// let s = item.1;
+/// if item.0 > 10 {
+/// continue;
+/// } else {
+/// s.clear();
+/// }
+/// }
+/// }
+/// ```
+///
+/// When called on the expression `item.0` this will return false unless the local `item` is in the
+/// `ignore_locals` set. The type `(usize, &mut String)` can have the second element moved, so it
+/// isn't always safe to move into a closure when only a single field is needed.
+///
+/// When called on the `continue` expression this will return false unless the outer loop expression
+/// is in the `loop_ids` set.
+///
+/// Note that this check is not recursive, so passing the `if` expression will always return true
+/// even though sub-expressions might return false.
+pub fn can_move_expr_to_closure_no_visit<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ loop_ids: &[HirId],
+ ignore_locals: &HirIdSet,
+) -> bool {
+ match expr.kind {
+ ExprKind::Break(Destination { target_id: Ok(id), .. }, _)
+ | ExprKind::Continue(Destination { target_id: Ok(id), .. })
+ if loop_ids.contains(&id) =>
+ {
+ true
+ },
+ ExprKind::Break(..)
+ | ExprKind::Continue(_)
+ | ExprKind::Ret(_)
+ | ExprKind::Yield(..)
+ | ExprKind::InlineAsm(_) => false,
+ // Accessing a field of a local value can only be done if the type isn't
+ // partially moved.
+ ExprKind::Field(
+ &Expr {
+ hir_id,
+ kind:
+ ExprKind::Path(QPath::Resolved(
+ _,
+ Path {
+ res: Res::Local(local_id),
+ ..
+ },
+ )),
+ ..
+ },
+ _,
+ ) if !ignore_locals.contains(local_id) && can_partially_move_ty(cx, cx.typeck_results().node_type(hir_id)) => {
+ // TODO: check if the local has been partially moved. Assume it has for now.
+ false
+ },
+ _ => true,
+ }
+}
+
+/// How a local is captured by a closure
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum CaptureKind {
+ Value,
+ Ref(Mutability),
+}
+impl CaptureKind {
+ pub fn is_imm_ref(self) -> bool {
+ self == Self::Ref(Mutability::Not)
+ }
+}
+impl std::ops::BitOr for CaptureKind {
+ type Output = Self;
+ fn bitor(self, rhs: Self) -> Self::Output {
+ match (self, rhs) {
+ (CaptureKind::Value, _) | (_, CaptureKind::Value) => CaptureKind::Value,
+ (CaptureKind::Ref(Mutability::Mut), CaptureKind::Ref(_))
+ | (CaptureKind::Ref(_), CaptureKind::Ref(Mutability::Mut)) => CaptureKind::Ref(Mutability::Mut),
+ (CaptureKind::Ref(Mutability::Not), CaptureKind::Ref(Mutability::Not)) => CaptureKind::Ref(Mutability::Not),
+ }
+ }
+}
+impl std::ops::BitOrAssign for CaptureKind {
+ fn bitor_assign(&mut self, rhs: Self) {
+ *self = *self | rhs;
+ }
+}
+
+/// Given an expression referencing a local, determines how it would be captured in a closure.
+/// Note as this will walk up to parent expressions until the capture can be determined it should
+/// only be used while making a closure somewhere a value is consumed. e.g. a block, match arm, or
+/// function argument (other than a receiver).
+pub fn capture_local_usage<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> CaptureKind {
+ fn pat_capture_kind(cx: &LateContext<'_>, pat: &Pat<'_>) -> CaptureKind {
+ let mut capture = CaptureKind::Ref(Mutability::Not);
+ pat.each_binding_or_first(&mut |_, id, span, _| match cx
+ .typeck_results()
+ .extract_binding_mode(cx.sess(), id, span)
+ .unwrap()
+ {
+ BindingMode::BindByValue(_) if !is_copy(cx, cx.typeck_results().node_type(id)) => {
+ capture = CaptureKind::Value;
+ },
+ BindingMode::BindByReference(Mutability::Mut) if capture != CaptureKind::Value => {
+ capture = CaptureKind::Ref(Mutability::Mut);
+ },
+ _ => (),
+ });
+ capture
+ }
+
+ debug_assert!(matches!(
+ e.kind,
+ ExprKind::Path(QPath::Resolved(None, Path { res: Res::Local(_), .. }))
+ ));
+
+ let mut child_id = e.hir_id;
+ let mut capture = CaptureKind::Value;
+ let mut capture_expr_ty = e;
+
+ for (parent_id, parent) in cx.tcx.hir().parent_iter(e.hir_id) {
+ if let [
+ Adjustment {
+ kind: Adjust::Deref(_) | Adjust::Borrow(AutoBorrow::Ref(..)),
+ target,
+ },
+ ref adjust @ ..,
+ ] = *cx
+ .typeck_results()
+ .adjustments()
+ .get(child_id)
+ .map_or(&[][..], |x| &**x)
+ {
+ if let rustc_ty::RawPtr(TypeAndMut { mutbl: mutability, .. }) | rustc_ty::Ref(_, _, mutability) =
+ *adjust.last().map_or(target, |a| a.target).kind()
+ {
+ return CaptureKind::Ref(mutability);
+ }
+ }
+
+ match parent {
+ Node::Expr(e) => match e.kind {
+ ExprKind::AddrOf(_, mutability, _) => return CaptureKind::Ref(mutability),
+ ExprKind::Index(..) | ExprKind::Unary(UnOp::Deref, _) => capture = CaptureKind::Ref(Mutability::Not),
+ ExprKind::Assign(lhs, ..) | ExprKind::Assign(_, lhs, _) if lhs.hir_id == child_id => {
+ return CaptureKind::Ref(Mutability::Mut);
+ },
+ ExprKind::Field(..) => {
+ if capture == CaptureKind::Value {
+ capture_expr_ty = e;
+ }
+ },
+ ExprKind::Let(let_expr) => {
+ let mutability = match pat_capture_kind(cx, let_expr.pat) {
+ CaptureKind::Value => Mutability::Not,
+ CaptureKind::Ref(m) => m,
+ };
+ return CaptureKind::Ref(mutability);
+ },
+ ExprKind::Match(_, arms, _) => {
+ let mut mutability = Mutability::Not;
+ for capture in arms.iter().map(|arm| pat_capture_kind(cx, arm.pat)) {
+ match capture {
+ CaptureKind::Value => break,
+ CaptureKind::Ref(Mutability::Mut) => mutability = Mutability::Mut,
+ CaptureKind::Ref(Mutability::Not) => (),
+ }
+ }
+ return CaptureKind::Ref(mutability);
+ },
+ _ => break,
+ },
+ Node::Local(l) => match pat_capture_kind(cx, l.pat) {
+ CaptureKind::Value => break,
+ capture @ CaptureKind::Ref(_) => return capture,
+ },
+ _ => break,
+ }
+
+ child_id = parent_id;
+ }
+
+ if capture == CaptureKind::Value && is_copy(cx, cx.typeck_results().expr_ty(capture_expr_ty)) {
+ // Copy types are never automatically captured by value.
+ CaptureKind::Ref(Mutability::Not)
+ } else {
+ capture
+ }
+}
+
+/// Checks if the expression can be moved into a closure as is. This will return a list of captures
+/// if so, otherwise, `None`.
+pub fn can_move_expr_to_closure<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<HirIdMap<CaptureKind>> {
+ struct V<'cx, 'tcx> {
+ cx: &'cx LateContext<'tcx>,
+ // Stack of potential break targets contained in the expression.
+ loops: Vec<HirId>,
+ /// Local variables created in the expression. These don't need to be captured.
+ locals: HirIdSet,
+ /// Whether this expression can be turned into a closure.
+ allow_closure: bool,
+ /// Locals which need to be captured, and whether they need to be by value, reference, or
+ /// mutable reference.
+ captures: HirIdMap<CaptureKind>,
+ }
+ impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
+ fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
+ if !self.allow_closure {
+ return;
+ }
+
+ match e.kind {
+ ExprKind::Path(QPath::Resolved(None, &Path { res: Res::Local(l), .. })) => {
+ if !self.locals.contains(&l) {
+ let cap = capture_local_usage(self.cx, e);
+ self.captures.entry(l).and_modify(|e| *e |= cap).or_insert(cap);
+ }
+ },
+ ExprKind::Closure(..) => {
+ let closure_id = self.cx.tcx.hir().local_def_id(e.hir_id).to_def_id();
+ for capture in self.cx.typeck_results().closure_min_captures_flattened(closure_id) {
+ let local_id = match capture.place.base {
+ PlaceBase::Local(id) => id,
+ PlaceBase::Upvar(var) => var.var_path.hir_id,
+ _ => continue,
+ };
+ if !self.locals.contains(&local_id) {
+ let capture = match capture.info.capture_kind {
+ UpvarCapture::ByValue => CaptureKind::Value,
+ UpvarCapture::ByRef(kind) => match kind {
+ BorrowKind::ImmBorrow => CaptureKind::Ref(Mutability::Not),
+ BorrowKind::UniqueImmBorrow | BorrowKind::MutBorrow => {
+ CaptureKind::Ref(Mutability::Mut)
+ },
+ },
+ };
+ self.captures
+ .entry(local_id)
+ .and_modify(|e| *e |= capture)
+ .or_insert(capture);
+ }
+ }
+ },
+ ExprKind::Loop(b, ..) => {
+ self.loops.push(e.hir_id);
+ self.visit_block(b);
+ self.loops.pop();
+ },
+ _ => {
+ self.allow_closure &= can_move_expr_to_closure_no_visit(self.cx, e, &self.loops, &self.locals);
+ walk_expr(self, e);
+ },
+ }
+ }
+
+ fn visit_pat(&mut self, p: &'tcx Pat<'tcx>) {
+ p.each_binding_or_first(&mut |_, id, _, _| {
+ self.locals.insert(id);
+ });
+ }
+ }
+
+ let mut v = V {
+ cx,
+ allow_closure: true,
+ loops: Vec::new(),
+ locals: HirIdSet::default(),
+ captures: HirIdMap::default(),
+ };
+ v.visit_expr(expr);
+ v.allow_closure.then(|| v.captures)
+}
+
+/// Returns the method names and argument list of nested method call expressions that make up
+/// `expr`. method/span lists are sorted with the most recent call first.
+pub fn method_calls<'tcx>(
+ expr: &'tcx Expr<'tcx>,
+ max_depth: usize,
+) -> (Vec<Symbol>, Vec<&'tcx [Expr<'tcx>]>, Vec<Span>) {
+ let mut method_names = Vec::with_capacity(max_depth);
+ let mut arg_lists = Vec::with_capacity(max_depth);
+ let mut spans = Vec::with_capacity(max_depth);
+
+ let mut current = expr;
+ for _ in 0..max_depth {
+ if let ExprKind::MethodCall(path, args, _) = ¤t.kind {
+ if args.iter().any(|e| e.span.from_expansion()) {
+ break;
+ }
+ method_names.push(path.ident.name);
+ arg_lists.push(&**args);
+ spans.push(path.ident.span);
+ current = &args[0];
+ } else {
+ break;
+ }
+ }
+
+ (method_names, arg_lists, spans)
+}
+
+/// Matches an `Expr` against a chain of methods, and return the matched `Expr`s.
+///
+/// For example, if `expr` represents the `.baz()` in `foo.bar().baz()`,
+/// `method_chain_args(expr, &["bar", "baz"])` will return a `Vec`
+/// containing the `Expr`s for
+/// `.bar()` and `.baz()`
+pub fn method_chain_args<'a>(expr: &'a Expr<'_>, methods: &[&str]) -> Option<Vec<&'a [Expr<'a>]>> {
+ let mut current = expr;
+ let mut matched = Vec::with_capacity(methods.len());
+ for method_name in methods.iter().rev() {
+ // method chains are stored last -> first
+ if let ExprKind::MethodCall(path, args, _) = current.kind {
+ if path.ident.name.as_str() == *method_name {
+ if args.iter().any(|e| e.span.from_expansion()) {
+ return None;
+ }
+ matched.push(args); // build up `matched` backwards
+ current = &args[0]; // go to parent expression
+ } else {
+ return None;
+ }
+ } else {
+ return None;
+ }
+ }
+ // Reverse `matched` so that it is in the same order as `methods`.
+ matched.reverse();
+ Some(matched)
+}
+
+/// Returns `true` if the provided `def_id` is an entrypoint to a program.
+pub fn is_entrypoint_fn(cx: &LateContext<'_>, def_id: DefId) -> bool {
+ cx.tcx
+ .entry_fn(())
+ .map_or(false, |(entry_fn_def_id, _)| def_id == entry_fn_def_id)
+}
+
+/// Returns `true` if the expression is in the program's `#[panic_handler]`.
+pub fn is_in_panic_handler(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ let parent = cx.tcx.hir().get_parent_item(e.hir_id);
+ Some(parent.to_def_id()) == cx.tcx.lang_items().panic_impl()
+}
+
+/// Gets the name of the item the expression is in, if available.
+pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Symbol> {
+ let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id);
+ match cx.tcx.hir().find_by_def_id(parent_id) {
+ Some(
+ Node::Item(Item { ident, .. })
+ | Node::TraitItem(TraitItem { ident, .. })
+ | Node::ImplItem(ImplItem { ident, .. }),
+ ) => Some(ident.name),
+ _ => None,
+ }
+}
+
+pub struct ContainsName {
+ pub name: Symbol,
+ pub result: bool,
+}
+
+impl<'tcx> Visitor<'tcx> for ContainsName {
+ fn visit_name(&mut self, _: Span, name: Symbol) {
+ if self.name == name {
+ self.result = true;
+ }
+ }
+}
+
+/// Checks if an `Expr` contains a certain name.
+pub fn contains_name(name: Symbol, expr: &Expr<'_>) -> bool {
+ let mut cn = ContainsName { name, result: false };
+ cn.visit_expr(expr);
+ cn.result
+}
+
+/// Returns `true` if `expr` contains a return expression
+pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
+ let mut found = false;
+ expr_visitor_no_bodies(|expr| {
+ if !found {
+ if let hir::ExprKind::Ret(..) = &expr.kind {
+ found = true;
+ }
+ }
+ !found
+ })
+ .visit_expr(expr);
+ found
+}
+
+/// Extends the span to the beginning of the spans line, incl. whitespaces.
+///
+/// ```rust
+/// let x = ();
+/// // ^^
+/// // will be converted to
+/// let x = ();
+/// // ^^^^^^^^^^^^^^
+/// ```
+fn line_span<T: LintContext>(cx: &T, span: Span) -> Span {
+ let span = original_sp(span, DUMMY_SP);
+ let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
+ let line_no = source_map_and_line.line;
+ let line_start = source_map_and_line.sf.lines[line_no];
+ span.with_lo(line_start)
+}
+
+/// Gets the parent node, if any.
+pub fn get_parent_node(tcx: TyCtxt<'_>, id: HirId) -> Option<Node<'_>> {
+ tcx.hir().parent_iter(id).next().map(|(_, node)| node)
+}
+
+/// Gets the parent expression, if any –- this is useful to constrain a lint.
+pub fn get_parent_expr<'tcx>(cx: &LateContext<'tcx>, e: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+ get_parent_expr_for_hir(cx, e.hir_id)
+}
+
+/// This retrieves the parent for the given `HirId` if it's an expression. This is useful for
+/// constraint lints
+pub fn get_parent_expr_for_hir<'tcx>(cx: &LateContext<'tcx>, hir_id: hir::HirId) -> Option<&'tcx Expr<'tcx>> {
+ match get_parent_node(cx.tcx, hir_id) {
+ Some(Node::Expr(parent)) => Some(parent),
+ _ => None,
+ }
+}
+
+pub fn get_enclosing_block<'tcx>(cx: &LateContext<'tcx>, hir_id: HirId) -> Option<&'tcx Block<'tcx>> {
+ let map = &cx.tcx.hir();
+ let enclosing_node = map
+ .get_enclosing_scope(hir_id)
+ .and_then(|enclosing_id| map.find(enclosing_id));
+ enclosing_node.and_then(|node| match node {
+ Node::Block(block) => Some(block),
+ Node::Item(&Item {
+ kind: ItemKind::Fn(_, _, eid),
+ ..
+ })
+ | Node::ImplItem(&ImplItem {
+ kind: ImplItemKind::Fn(_, eid),
+ ..
+ }) => match cx.tcx.hir().body(eid).value.kind {
+ ExprKind::Block(block, _) => Some(block),
+ _ => None,
+ },
+ _ => None,
+ })
+}
+
+/// Gets the loop or closure enclosing the given expression, if any.
+pub fn get_enclosing_loop_or_closure<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<&'tcx Expr<'tcx>> {
+ for (_, node) in tcx.hir().parent_iter(expr.hir_id) {
+ match node {
+ Node::Expr(
+ e @ Expr {
+ kind: ExprKind::Loop(..) | ExprKind::Closure(..),
+ ..
+ },
+ ) => return Some(e),
+ Node::Expr(_) | Node::Stmt(_) | Node::Block(_) | Node::Local(_) | Node::Arm(_) => (),
+ _ => break,
+ }
+ }
+ None
+}
+
+/// Gets the parent node if it's an impl block.
+pub fn get_parent_as_impl(tcx: TyCtxt<'_>, id: HirId) -> Option<&Impl<'_>> {
+ match tcx.hir().parent_iter(id).next() {
+ Some((
+ _,
+ Node::Item(Item {
+ kind: ItemKind::Impl(imp),
+ ..
+ }),
+ )) => Some(imp),
+ _ => None,
+ }
+}
+
+/// Removes blocks around an expression, only if the block contains just one expression
+/// and no statements. Unsafe blocks are not removed.
+///
+/// Examples:
+/// * `{}` -> `{}`
+/// * `{ x }` -> `x`
+/// * `{{ x }}` -> `x`
+/// * `{ x; }` -> `{ x; }`
+/// * `{ x; y }` -> `{ x; y }`
+/// * `{ unsafe { x } }` -> `unsafe { x }`
+pub fn peel_blocks<'a>(mut expr: &'a Expr<'a>) -> &'a Expr<'a> {
+ while let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: Some(inner),
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ },
+ _,
+ ) = expr.kind
+ {
+ expr = inner;
+ }
+ expr
+}
+
+/// Removes blocks around an expression, only if the block contains just one expression
+/// or just one expression statement with a semicolon. Unsafe blocks are not removed.
+///
+/// Examples:
+/// * `{}` -> `{}`
+/// * `{ x }` -> `x`
+/// * `{ x; }` -> `x`
+/// * `{{ x; }}` -> `x`
+/// * `{ x; y }` -> `{ x; y }`
+/// * `{ unsafe { x } }` -> `unsafe { x }`
+pub fn peel_blocks_with_stmt<'a>(mut expr: &'a Expr<'a>) -> &'a Expr<'a> {
+ while let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr: Some(inner),
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ }
+ | Block {
+ stmts:
+ [
+ Stmt {
+ kind: StmtKind::Expr(inner) | StmtKind::Semi(inner),
+ ..
+ },
+ ],
+ expr: None,
+ rules: BlockCheckMode::DefaultBlock,
+ ..
+ },
+ _,
+ ) = expr.kind
+ {
+ expr = inner;
+ }
+ expr
+}
+
+/// Checks if the given expression is the else clause of either an `if` or `if let` expression.
+pub fn is_else_clause(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ let mut iter = tcx.hir().parent_iter(expr.hir_id);
+ match iter.next() {
+ Some((
+ _,
+ Node::Expr(Expr {
+ kind: ExprKind::If(_, _, Some(else_expr)),
+ ..
+ }),
+ )) => else_expr.hir_id == expr.hir_id,
+ _ => false,
+ }
+}
+
+/// Checks whether the given expression is a constant integer of the given value.
+/// unlike `is_integer_literal`, this version does const folding
+pub fn is_integer_const(cx: &LateContext<'_>, e: &Expr<'_>, value: u128) -> bool {
+ if is_integer_literal(e, value) {
+ return true;
+ }
+ let enclosing_body = cx.tcx.hir().local_def_id(cx.tcx.hir().enclosing_body_owner(e.hir_id));
+ if let Some((Constant::Int(v), _)) = constant(cx, cx.tcx.typeck(enclosing_body), e) {
+ return value == v;
+ }
+ false
+}
+
+/// Checks whether the given expression is a constant literal of the given value.
+pub fn is_integer_literal(expr: &Expr<'_>, value: u128) -> bool {
+ // FIXME: use constant folding
+ if let ExprKind::Lit(ref spanned) = expr.kind {
+ if let LitKind::Int(v, _) = spanned.node {
+ return v == value;
+ }
+ }
+ false
+}
+
+/// Returns `true` if the given `Expr` has been coerced before.
+///
+/// Examples of coercions can be found in the Nomicon at
+/// <https://doc.rust-lang.org/nomicon/coercions.html>.
+///
+/// See `rustc_middle::ty::adjustment::Adjustment` and `rustc_typeck::check::coercion` for more
+/// information on adjustments and coercions.
+pub fn is_adjusted(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
+ cx.typeck_results().adjustments().get(e.hir_id).is_some()
+}
+
+/// Returns the pre-expansion span if this comes from an expansion of the
+/// macro `name`.
+/// See also [`is_direct_expn_of`].
+#[must_use]
+pub fn is_expn_of(mut span: Span, name: &str) -> Option<Span> {
+ loop {
+ if span.from_expansion() {
+ let data = span.ctxt().outer_expn_data();
+ let new_span = data.call_site;
+
+ if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
+ if mac_name.as_str() == name {
+ return Some(new_span);
+ }
+ }
+
+ span = new_span;
+ } else {
+ return None;
+ }
+ }
+}
+
+/// Returns the pre-expansion span if the span directly comes from an expansion
+/// of the macro `name`.
+/// The difference with [`is_expn_of`] is that in
+/// ```rust
+/// # macro_rules! foo { ($name:tt!$args:tt) => { $name!$args } }
+/// # macro_rules! bar { ($e:expr) => { $e } }
+/// foo!(bar!(42));
+/// ```
+/// `42` is considered expanded from `foo!` and `bar!` by `is_expn_of` but only
+/// from `bar!` by `is_direct_expn_of`.
+#[must_use]
+pub fn is_direct_expn_of(span: Span, name: &str) -> Option<Span> {
+ if span.from_expansion() {
+ let data = span.ctxt().outer_expn_data();
+ let new_span = data.call_site;
+
+ if let ExpnKind::Macro(MacroKind::Bang, mac_name) = data.kind {
+ if mac_name.as_str() == name {
+ return Some(new_span);
+ }
+ }
+ }
+
+ None
+}
+
+/// Convenience function to get the return type of a function.
+pub fn return_ty<'tcx>(cx: &LateContext<'tcx>, fn_item: hir::HirId) -> Ty<'tcx> {
+ let fn_def_id = cx.tcx.hir().local_def_id(fn_item);
+ let ret_ty = cx.tcx.fn_sig(fn_def_id).output();
+ cx.tcx.erase_late_bound_regions(ret_ty)
+}
+
+/// Convenience function to get the nth argument type of a function.
+pub fn nth_arg<'tcx>(cx: &LateContext<'tcx>, fn_item: hir::HirId, nth: usize) -> Ty<'tcx> {
+ let fn_def_id = cx.tcx.hir().local_def_id(fn_item);
+ let arg = cx.tcx.fn_sig(fn_def_id).input(nth);
+ cx.tcx.erase_late_bound_regions(arg)
+}
+
+/// Checks if an expression is constructing a tuple-like enum variant or struct
+pub fn is_ctor_or_promotable_const_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ if let ExprKind::Call(fun, _) = expr.kind {
+ if let ExprKind::Path(ref qp) = fun.kind {
+ let res = cx.qpath_res(qp, fun.hir_id);
+ return match res {
+ def::Res::Def(DefKind::Variant | DefKind::Ctor(..), ..) => true,
+ def::Res::Def(_, def_id) => cx.tcx.is_promotable_const_fn(def_id),
+ _ => false,
+ };
+ }
+ }
+ false
+}
+
+/// Returns `true` if a pattern is refutable.
+// TODO: should be implemented using rustc/mir_build/thir machinery
+pub fn is_refutable(cx: &LateContext<'_>, pat: &Pat<'_>) -> bool {
+ fn is_enum_variant(cx: &LateContext<'_>, qpath: &QPath<'_>, id: HirId) -> bool {
+ matches!(
+ cx.qpath_res(qpath, id),
+ def::Res::Def(DefKind::Variant, ..) | Res::Def(DefKind::Ctor(def::CtorOf::Variant, _), _)
+ )
+ }
+
+ fn are_refutable<'a, I: IntoIterator<Item = &'a Pat<'a>>>(cx: &LateContext<'_>, i: I) -> bool {
+ i.into_iter().any(|pat| is_refutable(cx, pat))
+ }
+
+ match pat.kind {
+ PatKind::Wild => false,
+ PatKind::Binding(_, _, _, pat) => pat.map_or(false, |pat| is_refutable(cx, pat)),
+ PatKind::Box(pat) | PatKind::Ref(pat, _) => is_refutable(cx, pat),
+ PatKind::Lit(..) | PatKind::Range(..) => true,
+ PatKind::Path(ref qpath) => is_enum_variant(cx, qpath, pat.hir_id),
+ PatKind::Or(pats) => {
+ // TODO: should be the honest check, that pats is exhaustive set
+ are_refutable(cx, pats)
+ },
+ PatKind::Tuple(pats, _) => are_refutable(cx, pats),
+ PatKind::Struct(ref qpath, fields, _) => {
+ is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, fields.iter().map(|field| &*field.pat))
+ },
+ PatKind::TupleStruct(ref qpath, pats, _) => is_enum_variant(cx, qpath, pat.hir_id) || are_refutable(cx, pats),
+ PatKind::Slice(head, middle, tail) => {
+ match &cx.typeck_results().node_type(pat.hir_id).kind() {
+ rustc_ty::Slice(..) => {
+ // [..] is the only irrefutable slice pattern.
+ !head.is_empty() || middle.is_none() || !tail.is_empty()
+ },
+ rustc_ty::Array(..) => are_refutable(cx, head.iter().chain(middle).chain(tail.iter())),
+ _ => {
+ // unreachable!()
+ true
+ },
+ }
+ },
+ }
+}
+
+/// If the pattern is an `or` pattern, call the function once for each sub pattern. Otherwise, call
+/// the function once on the given pattern.
+pub fn recurse_or_patterns<'tcx, F: FnMut(&'tcx Pat<'tcx>)>(pat: &'tcx Pat<'tcx>, mut f: F) {
+ if let PatKind::Or(pats) = pat.kind {
+ pats.iter().for_each(f);
+ } else {
+ f(pat);
+ }
+}
+
+/// Checks for the `#[automatically_derived]` attribute all `#[derive]`d
+/// implementations have.
+pub fn is_automatically_derived(attrs: &[ast::Attribute]) -> bool {
+ has_attr(attrs, sym::automatically_derived)
+}
+
+pub fn is_self(slf: &Param<'_>) -> bool {
+ if let PatKind::Binding(.., name, _) = slf.pat.kind {
+ name.name == kw::SelfLower
+ } else {
+ false
+ }
+}
+
+pub fn is_self_ty(slf: &hir::Ty<'_>) -> bool {
+ if let TyKind::Path(QPath::Resolved(None, path)) = slf.kind {
+ if let Res::SelfTy(..) = path.res {
+ return true;
+ }
+ }
+ false
+}
+
+pub fn iter_input_pats<'tcx>(decl: &FnDecl<'_>, body: &'tcx Body<'_>) -> impl Iterator<Item = &'tcx Param<'tcx>> {
+ (0..decl.inputs.len()).map(move |i| &body.params[i])
+}
+
+/// Checks if a given expression is a match expression expanded from the `?`
+/// operator or the `try` macro.
+pub fn is_try<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
+ fn is_ok(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ if_chain! {
+ if let PatKind::TupleStruct(ref path, pat, None) = arm.pat.kind;
+ if is_lang_ctor(cx, path, ResultOk);
+ if let PatKind::Binding(_, hir_id, _, None) = pat[0].kind;
+ if path_to_local_id(arm.body, hir_id);
+ then {
+ return true;
+ }
+ }
+ false
+ }
+
+ fn is_err(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
+ if let PatKind::TupleStruct(ref path, _, _) = arm.pat.kind {
+ is_lang_ctor(cx, path, ResultErr)
+ } else {
+ false
+ }
+ }
+
+ if let ExprKind::Match(_, arms, ref source) = expr.kind {
+ // desugared from a `?` operator
+ if *source == MatchSource::TryDesugar {
+ return Some(expr);
+ }
+
+ if_chain! {
+ if arms.len() == 2;
+ if arms[0].guard.is_none();
+ if arms[1].guard.is_none();
+ if (is_ok(cx, &arms[0]) && is_err(cx, &arms[1])) ||
+ (is_ok(cx, &arms[1]) && is_err(cx, &arms[0]));
+ then {
+ return Some(expr);
+ }
+ }
+ }
+
+ None
+}
+
+/// Returns `true` if the lint is allowed in the current context
+///
+/// Useful for skipping long running code when it's unnecessary
+pub fn is_lint_allowed(cx: &LateContext<'_>, lint: &'static Lint, id: HirId) -> bool {
+ cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow
+}
+
+pub fn strip_pat_refs<'hir>(mut pat: &'hir Pat<'hir>) -> &'hir Pat<'hir> {
+ while let PatKind::Ref(subpat, _) = pat.kind {
+ pat = subpat;
+ }
+ pat
+}
+
+pub fn int_bits(tcx: TyCtxt<'_>, ity: rustc_ty::IntTy) -> u64 {
+ Integer::from_int_ty(&tcx, ity).size().bits()
+}
+
+#[allow(clippy::cast_possible_wrap)]
+/// Turn a constant int byte representation into an i128
+pub fn sext(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::IntTy) -> i128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as i128) << amt) >> amt
+}
+
+#[allow(clippy::cast_sign_loss)]
+/// clip unused bytes
+pub fn unsext(tcx: TyCtxt<'_>, u: i128, ity: rustc_ty::IntTy) -> u128 {
+ let amt = 128 - int_bits(tcx, ity);
+ ((u as u128) << amt) >> amt
+}
+
+/// clip unused bytes
+pub fn clip(tcx: TyCtxt<'_>, u: u128, ity: rustc_ty::UintTy) -> u128 {
+ let bits = Integer::from_uint_ty(&tcx, ity).size().bits();
+ let amt = 128 - bits;
+ (u << amt) >> amt
+}
+
+pub fn has_attr(attrs: &[ast::Attribute], symbol: Symbol) -> bool {
+ attrs.iter().any(|attr| attr.has_name(symbol))
+}
+
+pub fn any_parent_has_attr(tcx: TyCtxt<'_>, node: HirId, symbol: Symbol) -> bool {
+ let map = &tcx.hir();
+ let mut prev_enclosing_node = None;
+ let mut enclosing_node = node;
+ while Some(enclosing_node) != prev_enclosing_node {
+ if has_attr(map.attrs(enclosing_node), symbol) {
+ return true;
+ }
+ prev_enclosing_node = Some(enclosing_node);
+ enclosing_node = map.local_def_id_to_hir_id(map.get_parent_item(enclosing_node));
+ }
+
+ false
+}
+
+pub fn any_parent_is_automatically_derived(tcx: TyCtxt<'_>, node: HirId) -> bool {
+ any_parent_has_attr(tcx, node, sym::automatically_derived)
+}
+
+/// Matches a function call with the given path and returns the arguments.
+///
+/// Usage:
+///
+/// ```rust,ignore
+/// if let Some(args) = match_function_call(cx, cmp_max_call, &paths::CMP_MAX);
+/// ```
+pub fn match_function_call<'tcx>(
+ cx: &LateContext<'tcx>,
+ expr: &'tcx Expr<'_>,
+ path: &[&str],
+) -> Option<&'tcx [Expr<'tcx>]> {
+ if_chain! {
+ if let ExprKind::Call(fun, args) = expr.kind;
+ if let ExprKind::Path(ref qpath) = fun.kind;
+ if let Some(fun_def_id) = cx.qpath_res(qpath, fun.hir_id).opt_def_id();
+ if match_def_path(cx, fun_def_id, path);
+ then {
+ return Some(args)
+ }
+ };
+ None
+}
+
+/// Checks if the given `DefId` matches any of the paths. Returns the index of matching path, if
+/// any.
+///
+/// Please use `match_any_diagnostic_items` if the targets are all diagnostic items.
+pub fn match_any_def_paths(cx: &LateContext<'_>, did: DefId, paths: &[&[&str]]) -> Option<usize> {
+ let search_path = cx.get_def_path(did);
+ paths
+ .iter()
+ .position(|p| p.iter().map(|x| Symbol::intern(x)).eq(search_path.iter().copied()))
+}
+
+/// Checks if the given `DefId` matches any of provided diagnostic items. Returns the index of
+/// matching path, if any.
+pub fn match_any_diagnostic_items(cx: &LateContext<'_>, def_id: DefId, diag_items: &[Symbol]) -> Option<usize> {
+ diag_items
+ .iter()
+ .position(|item| cx.tcx.is_diagnostic_item(*item, def_id))
+}
+
+/// Checks if the given `DefId` matches the path.
+pub fn match_def_path<'tcx>(cx: &LateContext<'tcx>, did: DefId, syms: &[&str]) -> bool {
+ // We should probably move to Symbols in Clippy as well rather than interning every time.
+ let path = cx.get_def_path(did);
+ syms.iter().map(|x| Symbol::intern(x)).eq(path.iter().copied())
+}
+
+/// Checks if the given `DefId` matches the `libc` item.
+pub fn match_libc_symbol(cx: &LateContext<'_>, did: DefId, name: &str) -> bool {
+ let path = cx.get_def_path(did);
+ // libc is meant to be used as a flat list of names, but they're all actually defined in different
+ // modules based on the target platform. Ignore everything but crate name and the item name.
+ path.first().map_or(false, |s| s.as_str() == "libc") && path.last().map_or(false, |s| s.as_str() == name)
+}
+
+/// Returns the list of condition expressions and the list of blocks in a
+/// sequence of `if/else`.
+/// E.g., this returns `([a, b], [c, d, e])` for the expression
+/// `if a { c } else if b { d } else { e }`.
+pub fn if_sequence<'tcx>(mut expr: &'tcx Expr<'tcx>) -> (Vec<&'tcx Expr<'tcx>>, Vec<&'tcx Block<'tcx>>) {
+ let mut conds = Vec::new();
+ let mut blocks: Vec<&Block<'_>> = Vec::new();
+
+ while let Some(higher::IfOrIfLet { cond, then, r#else }) = higher::IfOrIfLet::hir(expr) {
+ conds.push(&*cond);
+ if let ExprKind::Block(block, _) = then.kind {
+ blocks.push(block);
+ } else {
+ panic!("ExprKind::If node is not an ExprKind::Block");
+ }
+
+ if let Some(else_expr) = r#else {
+ expr = else_expr;
+ } else {
+ break;
+ }
+ }
+
+ // final `else {..}`
+ if !blocks.is_empty() {
+ if let ExprKind::Block(block, _) = expr.kind {
+ blocks.push(block);
+ }
+ }
+
+ (conds, blocks)
+}
+
+/// Checks if the given function kind is an async function.
+pub fn is_async_fn(kind: FnKind<'_>) -> bool {
+ matches!(kind, FnKind::ItemFn(_, _, header, _) if header.asyncness == IsAsync::Async)
+}
+
+/// Peels away all the compiler generated code surrounding the body of an async function,
+pub fn get_async_fn_body<'tcx>(tcx: TyCtxt<'tcx>, body: &Body<'_>) -> Option<&'tcx Expr<'tcx>> {
+ if let ExprKind::Call(
+ _,
+ &[
+ Expr {
+ kind: ExprKind::Closure(_, _, body, _, _),
+ ..
+ },
+ ],
+ ) = body.value.kind
+ {
+ if let ExprKind::Block(
+ Block {
+ stmts: [],
+ expr:
+ Some(Expr {
+ kind: ExprKind::DropTemps(expr),
+ ..
+ }),
+ ..
+ },
+ _,
+ ) = tcx.hir().body(body).value.kind
+ {
+ return Some(expr);
+ }
+ };
+ None
+}
+
+// Finds the `#[must_use]` attribute, if any
+pub fn must_use_attr(attrs: &[Attribute]) -> Option<&Attribute> {
+ attrs.iter().find(|a| a.has_name(sym::must_use))
+}
+
+// check if expr is calling method or function with #[must_use] attribute
+pub fn is_must_use_func_call(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ let did = match expr.kind {
+ ExprKind::Call(path, _) => if_chain! {
+ if let ExprKind::Path(ref qpath) = path.kind;
+ if let def::Res::Def(_, did) = cx.qpath_res(qpath, path.hir_id);
+ then {
+ Some(did)
+ } else {
+ None
+ }
+ },
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ _ => None,
+ };
+
+ did.map_or(false, |did| must_use_attr(cx.tcx.get_attrs(did)).is_some())
+}
+
+/// Checks if an expression represents the identity function
+/// Only examines closures and `std::convert::identity`
+pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
+ /// Checks if a function's body represents the identity function. Looks for bodies of the form:
+ /// * `|x| x`
+ /// * `|x| return x`
+ /// * `|x| { return x }`
+ /// * `|x| { return x; }`
+ fn is_body_identity_function(cx: &LateContext<'_>, func: &Body<'_>) -> bool {
+ let id = if_chain! {
+ if let [param] = func.params;
+ if let PatKind::Binding(_, id, _, _) = param.pat.kind;
+ then {
+ id
+ } else {
+ return false;
+ }
+ };
+
+ let mut expr = &func.value;
+ loop {
+ match expr.kind {
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [], expr: Some(e), .. }, _, )
+ | ExprKind::Ret(Some(e)) => expr = e,
+ #[rustfmt::skip]
+ ExprKind::Block(&Block { stmts: [stmt], expr: None, .. }, _) => {
+ if_chain! {
+ if let StmtKind::Semi(e) | StmtKind::Expr(e) = stmt.kind;
+ if let ExprKind::Ret(Some(ret_val)) = e.kind;
+ then {
+ expr = ret_val;
+ } else {
+ return false;
+ }
+ }
+ },
+ _ => return path_to_local_id(expr, id) && cx.typeck_results().expr_adjustments(expr).is_empty(),
+ }
+ }
+ }
+
+ match expr.kind {
+ ExprKind::Closure(_, _, body_id, _, _) => is_body_identity_function(cx, cx.tcx.hir().body(body_id)),
+ ExprKind::Path(ref path) => is_qpath_def_path(cx, path, expr.hir_id, &paths::CONVERT_IDENTITY),
+ _ => false,
+ }
+}
+
+/// Gets the node where an expression is either used, or it's type is unified with another branch.
- _ => break Some(Node::Expr(expr)),
++/// Returns both the node and the `HirId` of the closest child node.
++pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<(Node<'tcx>, HirId)> {
+ let mut child_id = expr.hir_id;
+ let mut iter = tcx.hir().parent_iter(child_id);
+ loop {
+ match iter.next() {
+ None => break None,
+ Some((id, Node::Block(_))) => child_id = id,
+ Some((id, Node::Arm(arm))) if arm.body.hir_id == child_id => child_id = id,
+ Some((_, Node::Expr(expr))) => match expr.kind {
+ ExprKind::Match(_, [arm], _) if arm.hir_id == child_id => child_id = expr.hir_id,
+ ExprKind::Block(..) | ExprKind::DropTemps(_) => child_id = expr.hir_id,
+ ExprKind::If(_, then_expr, None) if then_expr.hir_id == child_id => break None,
- Some((_, node)) => break Some(node),
++ _ => break Some((Node::Expr(expr), child_id)),
+ },
- None | Some(Node::Stmt(Stmt {
- kind: StmtKind::Expr(_)
- | StmtKind::Semi(_)
- | StmtKind::Local(Local {
- pat: Pat {
- kind: PatKind::Wild,
++ Some((_, node)) => break Some((node, child_id)),
+ }
+ }
+}
+
+/// Checks if the result of an expression is used, or it's type is unified with another branch.
+pub fn is_expr_used_or_unified(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ !matches!(
+ get_expr_use_or_unification_node(tcx, expr),
- },
- ..
- }),
- ..
- }))
++ None | Some((
++ Node::Stmt(Stmt {
++ kind: StmtKind::Expr(_)
++ | StmtKind::Semi(_)
++ | StmtKind::Local(Local {
++ pat: Pat {
++ kind: PatKind::Wild,
++ ..
++ },
+ ..
++ }),
++ ..
++ }),
++ _
++ ))
+ )
+}
+
+/// Checks if the expression is the final expression returned from a block.
+pub fn is_expr_final_block_expr(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
+ matches!(get_parent_node(tcx, expr.hir_id), Some(Node::Block(..)))
+}
+
+pub fn std_or_core(cx: &LateContext<'_>) -> Option<&'static str> {
+ if !is_no_std_crate(cx) {
+ Some("std")
+ } else if !is_no_core_crate(cx) {
+ Some("core")
+ } else {
+ None
+ }
+}
+
+pub fn is_no_std_crate(cx: &LateContext<'_>) -> bool {
+ cx.tcx.hir().attrs(hir::CRATE_HIR_ID).iter().any(|attr| {
+ if let ast::AttrKind::Normal(ref attr, _) = attr.kind {
+ attr.path == sym::no_std
+ } else {
+ false
+ }
+ })
+}
+
+pub fn is_no_core_crate(cx: &LateContext<'_>) -> bool {
+ cx.tcx.hir().attrs(hir::CRATE_HIR_ID).iter().any(|attr| {
+ if let ast::AttrKind::Normal(ref attr, _) = attr.kind {
+ attr.path == sym::no_core
+ } else {
+ false
+ }
+ })
+}
+
+/// Check if parent of a hir node is a trait implementation block.
+/// For example, `f` in
+/// ```rust
+/// # struct S;
+/// # trait Trait { fn f(); }
+/// impl Trait for S {
+/// fn f() {}
+/// }
+/// ```
+pub fn is_trait_impl_item(cx: &LateContext<'_>, hir_id: HirId) -> bool {
+ if let Some(Node::Item(item)) = cx.tcx.hir().find(cx.tcx.hir().get_parent_node(hir_id)) {
+ matches!(item.kind, ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }))
+ } else {
+ false
+ }
+}
+
+/// Check if it's even possible to satisfy the `where` clause for the item.
+///
+/// `trivial_bounds` feature allows functions with unsatisfiable bounds, for example:
+///
+/// ```ignore
+/// fn foo() where i32: Iterator {
+/// for _ in 2i32 {}
+/// }
+/// ```
+pub fn fn_has_unsatisfiable_preds(cx: &LateContext<'_>, did: DefId) -> bool {
+ use rustc_trait_selection::traits;
+ let predicates = cx
+ .tcx
+ .predicates_of(did)
+ .predicates
+ .iter()
+ .filter_map(|(p, _)| if p.is_global() { Some(*p) } else { None });
+ traits::impossible_predicates(
+ cx.tcx,
+ traits::elaborate_predicates(cx.tcx, predicates)
+ .map(|o| o.predicate)
+ .collect::<Vec<_>>(),
+ )
+}
+
+/// Returns the `DefId` of the callee if the given expression is a function or method call.
+pub fn fn_def_id(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<DefId> {
+ match &expr.kind {
+ ExprKind::MethodCall(..) => cx.typeck_results().type_dependent_def_id(expr.hir_id),
+ ExprKind::Call(
+ Expr {
+ kind: ExprKind::Path(qpath),
+ hir_id: path_hir_id,
+ ..
+ },
+ ..,
+ ) => cx.typeck_results().qpath_res(qpath, *path_hir_id).opt_def_id(),
+ _ => None,
+ }
+}
+
+/// Returns Option<String> where String is a textual representation of the type encapsulated in the
+/// slice iff the given expression is a slice of primitives (as defined in the
+/// `is_recursively_primitive_type` function) and None otherwise.
+pub fn is_slice_of_primitives(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<String> {
+ let expr_type = cx.typeck_results().expr_ty_adjusted(expr);
+ let expr_kind = expr_type.kind();
+ let is_primitive = match expr_kind {
+ rustc_ty::Slice(element_type) => is_recursively_primitive_type(element_type),
+ rustc_ty::Ref(_, inner_ty, _) if matches!(inner_ty.kind(), &rustc_ty::Slice(_)) => {
+ if let rustc_ty::Slice(element_type) = inner_ty.kind() {
+ is_recursively_primitive_type(element_type)
+ } else {
+ unreachable!()
+ }
+ },
+ _ => false,
+ };
+
+ if is_primitive {
+ // if we have wrappers like Array, Slice or Tuple, print these
+ // and get the type enclosed in the slice ref
+ match expr_type.peel_refs().walk().nth(1).unwrap().expect_ty().kind() {
+ rustc_ty::Slice(..) => return Some("slice".into()),
+ rustc_ty::Array(..) => return Some("array".into()),
+ rustc_ty::Tuple(..) => return Some("tuple".into()),
+ _ => {
+ // is_recursively_primitive_type() should have taken care
+ // of the rest and we can rely on the type that is found
+ let refs_peeled = expr_type.peel_refs();
+ return Some(refs_peeled.walk().last().unwrap().to_string());
+ },
+ }
+ }
+ None
+}
+
+/// returns list of all pairs (a, b) from `exprs` such that `eq(a, b)`
+/// `hash` must be comformed with `eq`
+pub fn search_same<T, Hash, Eq>(exprs: &[T], hash: Hash, eq: Eq) -> Vec<(&T, &T)>
+where
+ Hash: Fn(&T) -> u64,
+ Eq: Fn(&T, &T) -> bool,
+{
+ match exprs {
+ [a, b] if eq(a, b) => return vec![(a, b)],
+ _ if exprs.len() <= 2 => return vec![],
+ _ => {},
+ }
+
+ let mut match_expr_list: Vec<(&T, &T)> = Vec::new();
+
+ let mut map: UnhashMap<u64, Vec<&_>> =
+ UnhashMap::with_capacity_and_hasher(exprs.len(), BuildHasherDefault::default());
+
+ for expr in exprs {
+ match map.entry(hash(expr)) {
+ Entry::Occupied(mut o) => {
+ for o in o.get() {
+ if eq(o, expr) {
+ match_expr_list.push((o, expr));
+ }
+ }
+ o.get_mut().push(expr);
+ },
+ Entry::Vacant(v) => {
+ v.insert(vec![expr]);
+ },
+ }
+ }
+
+ match_expr_list
+}
+
+/// Peels off all references on the pattern. Returns the underlying pattern and the number of
+/// references removed.
+pub fn peel_hir_pat_refs<'a>(pat: &'a Pat<'a>) -> (&'a Pat<'a>, usize) {
+ fn peel<'a>(pat: &'a Pat<'a>, count: usize) -> (&'a Pat<'a>, usize) {
+ if let PatKind::Ref(pat, _) = pat.kind {
+ peel(pat, count + 1)
+ } else {
+ (pat, count)
+ }
+ }
+ peel(pat, 0)
+}
+
+/// Peels of expressions while the given closure returns `Some`.
+pub fn peel_hir_expr_while<'tcx>(
+ mut expr: &'tcx Expr<'tcx>,
+ mut f: impl FnMut(&'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>>,
+) -> &'tcx Expr<'tcx> {
+ while let Some(e) = f(expr) {
+ expr = e;
+ }
+ expr
+}
+
+/// Peels off up to the given number of references on the expression. Returns the underlying
+/// expression and the number of references removed.
+pub fn peel_n_hir_expr_refs<'a>(expr: &'a Expr<'a>, count: usize) -> (&'a Expr<'a>, usize) {
+ let mut remaining = count;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) if remaining != 0 => {
+ remaining -= 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count - remaining)
+}
+
+/// Peels off all references on the expression. Returns the underlying expression and the number of
+/// references removed.
+pub fn peel_hir_expr_refs<'a>(expr: &'a Expr<'a>) -> (&'a Expr<'a>, usize) {
+ let mut count = 0;
+ let e = peel_hir_expr_while(expr, |e| match e.kind {
+ ExprKind::AddrOf(ast::BorrowKind::Ref, _, e) => {
+ count += 1;
+ Some(e)
+ },
+ _ => None,
+ });
+ (e, count)
+}
+
+/// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is
+/// dereferenced. An overloaded deref such as `Vec` to slice would not be removed.
+pub fn peel_ref_operators<'hir>(cx: &LateContext<'_>, mut expr: &'hir Expr<'hir>) -> &'hir Expr<'hir> {
+ loop {
+ match expr.kind {
+ ExprKind::AddrOf(_, _, e) => expr = e,
+ ExprKind::Unary(UnOp::Deref, e) if cx.typeck_results().expr_ty(e).is_ref() => expr = e,
+ _ => break,
+ }
+ }
+ expr
+}
+
+#[macro_export]
+macro_rules! unwrap_cargo_metadata {
+ ($cx: ident, $lint: ident, $deps: expr) => {{
+ let mut command = cargo_metadata::MetadataCommand::new();
+ if !$deps {
+ command.no_deps();
+ }
+
+ match command.exec() {
+ Ok(metadata) => metadata,
+ Err(err) => {
+ span_lint($cx, $lint, DUMMY_SP, &format!("could not read cargo metadata: {}", err));
+ return;
+ },
+ }
+ }};
+}
+
+pub fn is_hir_ty_cfg_dependant(cx: &LateContext<'_>, ty: &hir::Ty<'_>) -> bool {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ if let Res::Def(_, def_id) = path.res {
+ return cx.tcx.has_attr(def_id, sym::cfg) || cx.tcx.has_attr(def_id, sym::cfg_attr);
+ }
+ }
+ false
+}
+
+struct TestItemNamesVisitor<'tcx> {
+ tcx: TyCtxt<'tcx>,
+ names: Vec<Symbol>,
+}
+
+impl<'hir> ItemLikeVisitor<'hir> for TestItemNamesVisitor<'hir> {
+ fn visit_item(&mut self, item: &Item<'_>) {
+ if let ItemKind::Const(ty, _body) = item.kind {
+ if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind {
+ // We could also check for the type name `test::TestDescAndFn`
+ if let Res::Def(DefKind::Struct, _) = path.res {
+ let has_test_marker = self
+ .tcx
+ .hir()
+ .attrs(item.hir_id())
+ .iter()
+ .any(|a| a.has_name(sym::rustc_test_marker));
+ if has_test_marker {
+ self.names.push(item.ident.name);
+ }
+ }
+ }
+ }
+ }
+ fn visit_trait_item(&mut self, _: &TraitItem<'_>) {}
+ fn visit_impl_item(&mut self, _: &ImplItem<'_>) {}
+ fn visit_foreign_item(&mut self, _: &ForeignItem<'_>) {}
+}
+
+static TEST_ITEM_NAMES_CACHE: SyncOnceCell<Mutex<FxHashMap<LocalDefId, Vec<Symbol>>>> = SyncOnceCell::new();
+
+fn with_test_item_names<'tcx>(tcx: TyCtxt<'tcx>, module: LocalDefId, f: impl Fn(&[Symbol]) -> bool) -> bool {
+ let cache = TEST_ITEM_NAMES_CACHE.get_or_init(|| Mutex::new(FxHashMap::default()));
+ let mut map: MutexGuard<'_, FxHashMap<LocalDefId, Vec<Symbol>>> = cache.lock().unwrap();
+ match map.entry(module) {
+ Entry::Occupied(entry) => f(entry.get()),
+ Entry::Vacant(entry) => {
+ let mut visitor = TestItemNamesVisitor { tcx, names: Vec::new() };
+ tcx.hir().visit_item_likes_in_module(module, &mut visitor);
+ visitor.names.sort_unstable();
+ f(&*entry.insert(visitor.names))
+ },
+ }
+}
+
+/// Checks if the function containing the given `HirId` is a `#[test]` function
+///
+/// Note: If you use this function, please add a `#[test]` case in `tests/ui_test`.
+pub fn is_in_test_function(tcx: TyCtxt<'_>, id: hir::HirId) -> bool {
+ with_test_item_names(tcx, tcx.parent_module(id), |names| {
+ tcx.hir()
+ .parent_iter(id)
+ // Since you can nest functions we need to collect all until we leave
+ // function scope
+ .any(|(_id, node)| {
+ if let Node::Item(item) = node {
+ if let ItemKind::Fn(_, _, _) = item.kind {
+ // Note that we have sorted the item names in the visitor,
+ // so the binary_search gets the same as `contains`, but faster.
+ return names.binary_search(&item.ident.name).is_ok();
+ }
+ }
+ false
+ })
+ })
+}
+
+/// Checks whether item either has `test` attribute applied, or
+/// is a module with `test` in its name.
+///
+/// Note: If you use this function, please add a `#[test]` case in `tests/ui_test`.
+pub fn is_test_module_or_function(tcx: TyCtxt<'_>, item: &Item<'_>) -> bool {
+ is_in_test_function(tcx, item.hir_id())
+ || matches!(item.kind, ItemKind::Mod(..))
+ && item.ident.name.as_str().split('_').any(|a| a == "test" || a == "tests")
+}
+
+macro_rules! op_utils {
+ ($($name:ident $assign:ident)*) => {
+ /// Binary operation traits like `LangItem::Add`
+ pub static BINOP_TRAITS: &[LangItem] = &[$(LangItem::$name,)*];
+
+ /// Operator-Assign traits like `LangItem::AddAssign`
+ pub static OP_ASSIGN_TRAITS: &[LangItem] = &[$(LangItem::$assign,)*];
+
+ /// Converts `BinOpKind::Add` to `(LangItem::Add, LangItem::AddAssign)`, for example
+ pub fn binop_traits(kind: hir::BinOpKind) -> Option<(LangItem, LangItem)> {
+ match kind {
+ $(hir::BinOpKind::$name => Some((LangItem::$name, LangItem::$assign)),)*
+ _ => None,
+ }
+ }
+ };
+}
+
+op_utils! {
+ Add AddAssign
+ Sub SubAssign
+ Mul MulAssign
+ Div DivAssign
+ Rem RemAssign
+ BitXor BitXorAssign
+ BitAnd BitAndAssign
+ BitOr BitOrAssign
+ Shl ShlAssign
+ Shr ShrAssign
+}
--- /dev/null
- if lit_kind.is_numeric() && src.chars().next().map_or(false, |c| c.is_digit(10)) {
+use rustc_ast::ast::{Lit, LitFloatType, LitIntType, LitKind};
+use std::iter;
+
+#[derive(Debug, PartialEq, Copy, Clone)]
+pub enum Radix {
+ Binary,
+ Octal,
+ Decimal,
+ Hexadecimal,
+}
+
+impl Radix {
+ /// Returns a reasonable digit group size for this radix.
+ #[must_use]
+ fn suggest_grouping(self) -> usize {
+ match self {
+ Self::Binary | Self::Hexadecimal => 4,
+ Self::Octal | Self::Decimal => 3,
+ }
+ }
+}
+
+/// A helper method to format numeric literals with digit grouping.
+/// `lit` must be a valid numeric literal without suffix.
+pub fn format(lit: &str, type_suffix: Option<&str>, float: bool) -> String {
+ NumericLiteral::new(lit, type_suffix, float).format()
+}
+
+#[derive(Debug)]
+pub struct NumericLiteral<'a> {
+ /// Which radix the literal was represented in.
+ pub radix: Radix,
+ /// The radix prefix, if present.
+ pub prefix: Option<&'a str>,
+
+ /// The integer part of the number.
+ pub integer: &'a str,
+ /// The fraction part of the number.
+ pub fraction: Option<&'a str>,
+ /// The exponent separator (b'e' or b'E') including preceding underscore if present
+ /// and the exponent part.
+ pub exponent: Option<(&'a str, &'a str)>,
+
+ /// The type suffix, including preceding underscore if present.
+ pub suffix: Option<&'a str>,
+}
+
+impl<'a> NumericLiteral<'a> {
+ pub fn from_lit(src: &'a str, lit: &Lit) -> Option<NumericLiteral<'a>> {
+ NumericLiteral::from_lit_kind(src, &lit.kind)
+ }
+
+ pub fn from_lit_kind(src: &'a str, lit_kind: &LitKind) -> Option<NumericLiteral<'a>> {
++ let unsigned_src = src.strip_prefix('-').map_or(src, |s| s);
++ if lit_kind.is_numeric()
++ && unsigned_src
++ .trim_start()
++ .chars()
++ .next()
++ .map_or(false, |c| c.is_digit(10))
++ {
+ let (unsuffixed, suffix) = split_suffix(src, lit_kind);
+ let float = matches!(lit_kind, LitKind::Float(..));
+ Some(NumericLiteral::new(unsuffixed, suffix, float))
+ } else {
+ None
+ }
+ }
+
+ #[must_use]
+ pub fn new(lit: &'a str, suffix: Option<&'a str>, float: bool) -> Self {
+ // Determine delimiter for radix prefix, if present, and radix.
+ let radix = if lit.starts_with("0x") {
+ Radix::Hexadecimal
+ } else if lit.starts_with("0b") {
+ Radix::Binary
+ } else if lit.starts_with("0o") {
+ Radix::Octal
+ } else {
+ Radix::Decimal
+ };
+
+ // Grab part of the literal after prefix, if present.
+ let (prefix, mut sans_prefix) = if radix == Radix::Decimal {
+ (None, lit)
+ } else {
+ let (p, s) = lit.split_at(2);
+ (Some(p), s)
+ };
+
+ if suffix.is_some() && sans_prefix.ends_with('_') {
+ // The '_' before the suffix isn't part of the digits
+ sans_prefix = &sans_prefix[..sans_prefix.len() - 1];
+ }
+
+ let (integer, fraction, exponent) = Self::split_digit_parts(sans_prefix, float);
+
+ Self {
+ radix,
+ prefix,
+ integer,
+ fraction,
+ exponent,
+ suffix,
+ }
+ }
+
+ pub fn is_decimal(&self) -> bool {
+ self.radix == Radix::Decimal
+ }
+
+ pub fn split_digit_parts(digits: &str, float: bool) -> (&str, Option<&str>, Option<(&str, &str)>) {
+ let mut integer = digits;
+ let mut fraction = None;
+ let mut exponent = None;
+
+ if float {
+ for (i, c) in digits.char_indices() {
+ match c {
+ '.' => {
+ integer = &digits[..i];
+ fraction = Some(&digits[i + 1..]);
+ },
+ 'e' | 'E' => {
+ let exp_start = if digits[..i].ends_with('_') { i - 1 } else { i };
+
+ if integer.len() > exp_start {
+ integer = &digits[..exp_start];
+ } else {
+ fraction = Some(&digits[integer.len() + 1..exp_start]);
+ };
+ exponent = Some((&digits[exp_start..=i], &digits[i + 1..]));
+ break;
+ },
+ _ => {},
+ }
+ }
+ }
+
+ (integer, fraction, exponent)
+ }
+
+ /// Returns literal formatted in a sensible way.
+ pub fn format(&self) -> String {
+ let mut output = String::new();
+
+ if let Some(prefix) = self.prefix {
+ output.push_str(prefix);
+ }
+
+ let group_size = self.radix.suggest_grouping();
+
+ Self::group_digits(
+ &mut output,
+ self.integer,
+ group_size,
+ true,
+ self.radix == Radix::Hexadecimal,
+ );
+
+ if let Some(fraction) = self.fraction {
+ output.push('.');
+ Self::group_digits(&mut output, fraction, group_size, false, false);
+ }
+
+ if let Some((separator, exponent)) = self.exponent {
+ if exponent != "0" {
+ output.push_str(separator);
+ Self::group_digits(&mut output, exponent, group_size, true, false);
+ }
+ }
+
+ if let Some(suffix) = self.suffix {
+ if output.ends_with('.') {
+ output.push('0');
+ }
+ output.push('_');
+ output.push_str(suffix);
+ }
+
+ output
+ }
+
+ pub fn group_digits(output: &mut String, input: &str, group_size: usize, partial_group_first: bool, pad: bool) {
+ debug_assert!(group_size > 0);
+
+ let mut digits = input.chars().filter(|&c| c != '_');
+
+ // The exponent may have a sign, output it early, otherwise it will be
+ // treated as a digit
+ if digits.clone().next() == Some('-') {
+ let _ = digits.next();
+ output.push('-');
+ }
+
+ let first_group_size;
+
+ if partial_group_first {
+ first_group_size = (digits.clone().count() - 1) % group_size + 1;
+ if pad {
+ for _ in 0..group_size - first_group_size {
+ output.push('0');
+ }
+ }
+ } else {
+ first_group_size = group_size;
+ }
+
+ for _ in 0..first_group_size {
+ if let Some(digit) = digits.next() {
+ output.push(digit);
+ }
+ }
+
+ for (c, i) in iter::zip(digits, (0..group_size).cycle()) {
+ if i == 0 {
+ output.push('_');
+ }
+ output.push(c);
+ }
+ }
+}
+
+fn split_suffix<'a>(src: &'a str, lit_kind: &LitKind) -> (&'a str, Option<&'a str>) {
+ debug_assert!(lit_kind.is_numeric());
+ lit_suffix_length(lit_kind).map_or((src, None), |suffix_length| {
+ let (unsuffixed, suffix) = src.split_at(src.len() - suffix_length);
+ (unsuffixed, Some(suffix))
+ })
+}
+
+fn lit_suffix_length(lit_kind: &LitKind) -> Option<usize> {
+ debug_assert!(lit_kind.is_numeric());
+ let suffix = match lit_kind {
+ LitKind::Int(_, int_lit_kind) => match int_lit_kind {
+ LitIntType::Signed(int_ty) => Some(int_ty.name_str()),
+ LitIntType::Unsigned(uint_ty) => Some(uint_ty.name_str()),
+ LitIntType::Unsuffixed => None,
+ },
+ LitKind::Float(_, float_lit_kind) => match float_lit_kind {
+ LitFloatType::Suffixed(float_ty) => Some(float_ty.name_str()),
+ LitFloatType::Unsuffixed => None,
+ },
+ _ => None,
+ };
+
+ suffix.map(str::len)
+}
--- /dev/null
- fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
+//! Contains utility functions to generate suggestions.
+#![deny(clippy::missing_docs_in_private_items)]
+
+use crate::source::{snippet, snippet_opt, snippet_with_applicability, snippet_with_macro_callsite};
+use crate::{get_parent_expr_for_hir, higher};
+use rustc_ast::util::parser::AssocOp;
+use rustc_ast::{ast, token};
+use rustc_ast_pretty::pprust::token_kind_to_string;
+use rustc_errors::Applicability;
+use rustc_hir as hir;
+use rustc_hir::{ExprKind, HirId, MutTy, TyKind};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::{EarlyContext, LateContext, LintContext};
+use rustc_middle::hir::place::ProjectionKind;
+use rustc_middle::mir::{FakeReadCause, Mutability};
+use rustc_middle::ty;
+use rustc_span::source_map::{BytePos, CharPos, Pos, Span, SyntaxContext};
+use rustc_typeck::expr_use_visitor::{Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId};
+use std::borrow::Cow;
+use std::convert::TryInto;
+use std::fmt::Display;
+use std::iter;
+use std::ops::{Add, Neg, Not, Sub};
+
+/// A helper type to build suggestion correctly handling parentheses.
+#[derive(Clone, PartialEq)]
+pub enum Sugg<'a> {
+ /// An expression that never needs parentheses such as `1337` or `[0; 42]`.
+ NonParen(Cow<'a, str>),
+ /// An expression that does not fit in other variants.
+ MaybeParen(Cow<'a, str>),
+ /// A binary operator expression, including `as`-casts and explicit type
+ /// coercion.
+ BinOp(AssocOp, Cow<'a, str>, Cow<'a, str>),
+}
+
+/// Literal constant `0`, for convenience.
+pub const ZERO: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("0"));
+/// Literal constant `1`, for convenience.
+pub const ONE: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("1"));
+/// a constant represents an empty string, for convenience.
+pub const EMPTY: Sugg<'static> = Sugg::NonParen(Cow::Borrowed(""));
+
+impl Display for Sugg<'_> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ match *self {
+ Sugg::NonParen(ref s) | Sugg::MaybeParen(ref s) => s.fmt(f),
+ Sugg::BinOp(op, ref lhs, ref rhs) => binop_to_string(op, lhs, rhs).fmt(f),
+ }
+ }
+}
+
+#[allow(clippy::wrong_self_convention)] // ok, because of the function `as_ty` method
+impl<'a> Sugg<'a> {
+ /// Prepare a suggestion from an expression.
+ pub fn hir_opt(cx: &LateContext<'_>, expr: &hir::Expr<'_>) -> Option<Self> {
+ let get_snippet = |span| snippet(cx, span, "");
+ snippet_opt(cx, expr.span).map(|_| Self::hir_from_snippet(expr, get_snippet))
+ }
+
+ /// Convenience function around `hir_opt` for suggestions with a default
+ /// text.
+ pub fn hir(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ Self::hir_opt(cx, expr).unwrap_or(Sugg::NonParen(Cow::Borrowed(default)))
+ }
+
+ /// Same as `hir`, but it adapts the applicability level by following rules:
+ ///
+ /// - Applicability level `Unspecified` will never be changed.
+ /// - If the span is inside a macro, change the applicability level to `MaybeIncorrect`.
+ /// - If the default value is used and the applicability level is `MachineApplicable`, change it
+ /// to
+ /// `HasPlaceholders`
+ pub fn hir_with_applicability(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if *applicability != Applicability::Unspecified && expr.span.from_expansion() {
+ *applicability = Applicability::MaybeIncorrect;
+ }
+ Self::hir_opt(cx, expr).unwrap_or_else(|| {
+ if *applicability == Applicability::MachineApplicable {
+ *applicability = Applicability::HasPlaceholders;
+ }
+ Sugg::NonParen(Cow::Borrowed(default))
+ })
+ }
+
+ /// Same as `hir`, but will use the pre expansion span if the `expr` was in a macro.
+ pub fn hir_with_macro_callsite(cx: &LateContext<'_>, expr: &hir::Expr<'_>, default: &'a str) -> Self {
+ let get_snippet = |span| snippet_with_macro_callsite(cx, span, default);
+ Self::hir_from_snippet(expr, get_snippet)
+ }
+
+ /// Same as `hir`, but first walks the span up to the given context. This will result in the
+ /// macro call, rather then the expansion, if the span is from a child context. If the span is
+ /// not from a child context, it will be used directly instead.
+ ///
+ /// e.g. Given the expression `&vec![]`, getting a snippet from the span for `vec![]` as a HIR
+ /// node would result in `box []`. If given the context of the address of expression, this
+ /// function will correctly get a snippet of `vec![]`.
+ pub fn hir_with_context(
+ cx: &LateContext<'_>,
+ expr: &hir::Expr<'_>,
+ ctxt: SyntaxContext,
+ default: &'a str,
+ applicability: &mut Applicability,
+ ) -> Self {
+ if expr.span.ctxt() == ctxt {
+ Self::hir_from_snippet(expr, |span| snippet(cx, span, default))
+ } else {
+ let snip = snippet_with_applicability(cx, expr.span, default, applicability);
+ Sugg::NonParen(snip)
+ }
+ }
+
+ /// Generate a suggestion for an expression with the given snippet. This is used by the `hir_*`
+ /// function variants of `Sugg`, since these use different snippet functions.
+ fn hir_from_snippet(expr: &hir::Expr<'_>, get_snippet: impl Fn(Span) -> Cow<'a, str>) -> Self {
+ if let Some(range) = higher::Range::hir(expr) {
+ let op = match range.limits {
+ ast::RangeLimits::HalfOpen => AssocOp::DotDot,
+ ast::RangeLimits::Closed => AssocOp::DotDotEq,
+ };
+ let start = range.start.map_or("".into(), |expr| get_snippet(expr.span));
+ let end = range.end.map_or("".into(), |expr| get_snippet(expr.span));
+
+ return Sugg::BinOp(op, start, end);
+ }
+
+ match expr.kind {
+ hir::ExprKind::AddrOf(..)
+ | hir::ExprKind::Box(..)
+ | hir::ExprKind::If(..)
+ | hir::ExprKind::Let(..)
+ | hir::ExprKind::Closure(..)
+ | hir::ExprKind::Unary(..)
+ | hir::ExprKind::Match(..) => Sugg::MaybeParen(get_snippet(expr.span)),
+ hir::ExprKind::Continue(..)
+ | hir::ExprKind::Yield(..)
+ | hir::ExprKind::Array(..)
+ | hir::ExprKind::Block(..)
+ | hir::ExprKind::Break(..)
+ | hir::ExprKind::Call(..)
+ | hir::ExprKind::Field(..)
+ | hir::ExprKind::Index(..)
+ | hir::ExprKind::InlineAsm(..)
+ | hir::ExprKind::ConstBlock(..)
+ | hir::ExprKind::Lit(..)
+ | hir::ExprKind::Loop(..)
+ | hir::ExprKind::MethodCall(..)
+ | hir::ExprKind::Path(..)
+ | hir::ExprKind::Repeat(..)
+ | hir::ExprKind::Ret(..)
+ | hir::ExprKind::Struct(..)
+ | hir::ExprKind::Tup(..)
+ | hir::ExprKind::DropTemps(_)
+ | hir::ExprKind::Err => Sugg::NonParen(get_snippet(expr.span)),
+ hir::ExprKind::Assign(lhs, rhs, _) => {
+ Sugg::BinOp(AssocOp::Assign, get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::AssignOp(op, lhs, rhs) => {
+ Sugg::BinOp(hirbinop2assignop(op), get_snippet(lhs.span), get_snippet(rhs.span))
+ },
+ hir::ExprKind::Binary(op, lhs, rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node.into()),
+ get_snippet(lhs.span),
+ get_snippet(rhs.span),
+ ),
+ hir::ExprKind::Cast(lhs, ty) => Sugg::BinOp(AssocOp::As, get_snippet(lhs.span), get_snippet(ty.span)),
+ hir::ExprKind::Type(lhs, ty) => Sugg::BinOp(AssocOp::Colon, get_snippet(lhs.span), get_snippet(ty.span)),
+ }
+ }
+
+ /// Prepare a suggestion from an expression.
+ pub fn ast(cx: &EarlyContext<'_>, expr: &ast::Expr, default: &'a str) -> Self {
+ use rustc_ast::ast::RangeLimits;
+
+ let get_whole_snippet = || {
+ if expr.span.from_expansion() {
+ snippet_with_macro_callsite(cx, expr.span, default)
+ } else {
+ snippet(cx, expr.span, default)
+ }
+ };
+
+ match expr.kind {
+ ast::ExprKind::AddrOf(..)
+ | ast::ExprKind::Box(..)
+ | ast::ExprKind::Closure(..)
+ | ast::ExprKind::If(..)
+ | ast::ExprKind::Let(..)
+ | ast::ExprKind::Unary(..)
+ | ast::ExprKind::Match(..) => Sugg::MaybeParen(get_whole_snippet()),
+ ast::ExprKind::Async(..)
+ | ast::ExprKind::Block(..)
+ | ast::ExprKind::Break(..)
+ | ast::ExprKind::Call(..)
+ | ast::ExprKind::Continue(..)
+ | ast::ExprKind::Yield(..)
+ | ast::ExprKind::Field(..)
+ | ast::ExprKind::ForLoop(..)
+ | ast::ExprKind::Index(..)
+ | ast::ExprKind::InlineAsm(..)
+ | ast::ExprKind::ConstBlock(..)
+ | ast::ExprKind::Lit(..)
+ | ast::ExprKind::Loop(..)
+ | ast::ExprKind::MacCall(..)
+ | ast::ExprKind::MethodCall(..)
+ | ast::ExprKind::Paren(..)
+ | ast::ExprKind::Underscore
+ | ast::ExprKind::Path(..)
+ | ast::ExprKind::Repeat(..)
+ | ast::ExprKind::Ret(..)
+ | ast::ExprKind::Struct(..)
+ | ast::ExprKind::Try(..)
+ | ast::ExprKind::TryBlock(..)
+ | ast::ExprKind::Tup(..)
+ | ast::ExprKind::Array(..)
+ | ast::ExprKind::While(..)
+ | ast::ExprKind::Await(..)
+ | ast::ExprKind::Err => Sugg::NonParen(get_whole_snippet()),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::HalfOpen) => Sugg::BinOp(
+ AssocOp::DotDot,
+ lhs.as_ref().map_or("".into(), |lhs| snippet(cx, lhs.span, default)),
+ rhs.as_ref().map_or("".into(), |rhs| snippet(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Range(ref lhs, ref rhs, RangeLimits::Closed) => Sugg::BinOp(
+ AssocOp::DotDotEq,
+ lhs.as_ref().map_or("".into(), |lhs| snippet(cx, lhs.span, default)),
+ rhs.as_ref().map_or("".into(), |rhs| snippet(cx, rhs.span, default)),
+ ),
+ ast::ExprKind::Assign(ref lhs, ref rhs, _) => Sugg::BinOp(
+ AssocOp::Assign,
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::AssignOp(op, ref lhs, ref rhs) => Sugg::BinOp(
+ astbinop2assignop(op),
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Binary(op, ref lhs, ref rhs) => Sugg::BinOp(
+ AssocOp::from_ast_binop(op.node),
+ snippet(cx, lhs.span, default),
+ snippet(cx, rhs.span, default),
+ ),
+ ast::ExprKind::Cast(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::As,
+ snippet(cx, lhs.span, default),
+ snippet(cx, ty.span, default),
+ ),
+ ast::ExprKind::Type(ref lhs, ref ty) => Sugg::BinOp(
+ AssocOp::Colon,
+ snippet(cx, lhs.span, default),
+ snippet(cx, ty.span, default),
+ ),
+ }
+ }
+
+ /// Convenience method to create the `<lhs> && <rhs>` suggestion.
+ pub fn and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::And, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> & <rhs>` suggestion.
+ pub fn bit_and(self, rhs: &Self) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::BitAnd, &self, rhs)
+ }
+
+ /// Convenience method to create the `<lhs> as <rhs>` suggestion.
+ pub fn as_ty<R: Display>(self, rhs: R) -> Sugg<'static> {
+ make_assoc(AssocOp::As, &self, &Sugg::NonParen(rhs.to_string().into()))
+ }
+
+ /// Convenience method to create the `&<expr>` suggestion.
+ pub fn addr(self) -> Sugg<'static> {
+ make_unop("&", self)
+ }
+
+ /// Convenience method to create the `&mut <expr>` suggestion.
+ pub fn mut_addr(self) -> Sugg<'static> {
+ make_unop("&mut ", self)
+ }
+
+ /// Convenience method to create the `*<expr>` suggestion.
+ pub fn deref(self) -> Sugg<'static> {
+ make_unop("*", self)
+ }
+
+ /// Convenience method to create the `&*<expr>` suggestion. Currently this
+ /// is needed because `sugg.deref().addr()` produces an unnecessary set of
+ /// parentheses around the deref.
+ pub fn addr_deref(self) -> Sugg<'static> {
+ make_unop("&*", self)
+ }
+
+ /// Convenience method to create the `&mut *<expr>` suggestion. Currently
+ /// this is needed because `sugg.deref().mut_addr()` produces an unnecessary
+ /// set of parentheses around the deref.
+ pub fn mut_addr_deref(self) -> Sugg<'static> {
+ make_unop("&mut *", self)
+ }
+
+ /// Convenience method to transform suggestion into a return call
+ pub fn make_return(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("return {}", self)))
+ }
+
+ /// Convenience method to transform suggestion into a block
+ /// where the suggestion is a trailing expression
+ pub fn blockify(self) -> Sugg<'static> {
+ Sugg::NonParen(Cow::Owned(format!("{{ {} }}", self)))
+ }
+
+ /// Convenience method to create the `<lhs>..<rhs>` or `<lhs>...<rhs>`
+ /// suggestion.
+ #[allow(dead_code)]
+ pub fn range(self, end: &Self, limit: ast::RangeLimits) -> Sugg<'static> {
+ match limit {
+ ast::RangeLimits::HalfOpen => make_assoc(AssocOp::DotDot, &self, end),
+ ast::RangeLimits::Closed => make_assoc(AssocOp::DotDotEq, &self, end),
+ }
+ }
+
+ /// Adds parentheses to any expression that might need them. Suitable to the
+ /// `self` argument of a method call
+ /// (e.g., to build `bar.foo()` or `(1 + 2).foo()`).
+ #[must_use]
+ pub fn maybe_par(self) -> Self {
+ match self {
+ Sugg::NonParen(..) => self,
+ // `(x)` and `(x).y()` both don't need additional parens.
+ Sugg::MaybeParen(sugg) => {
+ if has_enclosing_paren(&sugg) {
+ Sugg::MaybeParen(sugg)
+ } else {
+ Sugg::NonParen(format!("({})", sugg).into())
+ }
+ },
+ Sugg::BinOp(op, lhs, rhs) => {
+ let sugg = binop_to_string(op, &lhs, &rhs);
+ Sugg::NonParen(format!("({})", sugg).into())
+ },
+ }
+ }
+}
+
+/// Generates a string from the operator and both sides.
+fn binop_to_string(op: AssocOp, lhs: &str, rhs: &str) -> String {
+ match op {
+ AssocOp::Add
+ | AssocOp::Subtract
+ | AssocOp::Multiply
+ | AssocOp::Divide
+ | AssocOp::Modulus
+ | AssocOp::LAnd
+ | AssocOp::LOr
+ | AssocOp::BitXor
+ | AssocOp::BitAnd
+ | AssocOp::BitOr
+ | AssocOp::ShiftLeft
+ | AssocOp::ShiftRight
+ | AssocOp::Equal
+ | AssocOp::Less
+ | AssocOp::LessEqual
+ | AssocOp::NotEqual
+ | AssocOp::Greater
+ | AssocOp::GreaterEqual => format!(
+ "{} {} {}",
+ lhs,
+ op.to_ast_binop().expect("Those are AST ops").to_string(),
+ rhs
+ ),
+ AssocOp::Assign => format!("{} = {}", lhs, rhs),
+ AssocOp::AssignOp(op) => {
+ format!("{} {}= {}", lhs, token_kind_to_string(&token::BinOp(op)), rhs)
+ },
+ AssocOp::As => format!("{} as {}", lhs, rhs),
+ AssocOp::DotDot => format!("{}..{}", lhs, rhs),
+ AssocOp::DotDotEq => format!("{}..={}", lhs, rhs),
+ AssocOp::Colon => format!("{}: {}", lhs, rhs),
+ }
+}
+
+/// Return `true` if `sugg` is enclosed in parenthesis.
++pub fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
+ let mut chars = sugg.as_ref().chars();
+ if chars.next() == Some('(') {
+ let mut depth = 1;
+ for c in &mut chars {
+ if c == '(' {
+ depth += 1;
+ } else if c == ')' {
+ depth -= 1;
+ }
+ if depth == 0 {
+ break;
+ }
+ }
+ chars.next().is_none()
+ } else {
+ false
+ }
+}
+
+/// Copied from the rust standard library, and then edited
+macro_rules! forward_binop_impls_to_ref {
+ (impl $imp:ident, $method:ident for $t:ty, type Output = $o:ty) => {
+ impl $imp<$t> for &$t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(self, &other)
+ }
+ }
+
+ impl $imp<&$t> for $t {
+ type Output = $o;
+
+ fn $method(self, other: &$t) -> $o {
+ $imp::$method(&self, other)
+ }
+ }
+
+ impl $imp for $t {
+ type Output = $o;
+
+ fn $method(self, other: $t) -> $o {
+ $imp::$method(&self, &other)
+ }
+ }
+ };
+}
+
+impl Add for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn add(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Add, self, rhs)
+ }
+}
+
+impl Sub for &Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn sub(self, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_binop(ast::BinOpKind::Sub, self, rhs)
+ }
+}
+
+forward_binop_impls_to_ref!(impl Add, add for Sugg<'_>, type Output = Sugg<'static>);
+forward_binop_impls_to_ref!(impl Sub, sub for Sugg<'_>, type Output = Sugg<'static>);
+
+impl Neg for Sugg<'_> {
+ type Output = Sugg<'static>;
+ fn neg(self) -> Sugg<'static> {
+ make_unop("-", self)
+ }
+}
+
+impl<'a> Not for Sugg<'a> {
+ type Output = Sugg<'a>;
+ fn not(self) -> Sugg<'a> {
+ use AssocOp::{Equal, Greater, GreaterEqual, Less, LessEqual, NotEqual};
+
+ if let Sugg::BinOp(op, lhs, rhs) = self {
+ let to_op = match op {
+ Equal => NotEqual,
+ NotEqual => Equal,
+ Less => GreaterEqual,
+ GreaterEqual => Less,
+ Greater => LessEqual,
+ LessEqual => Greater,
+ _ => return make_unop("!", Sugg::BinOp(op, lhs, rhs)),
+ };
+ Sugg::BinOp(to_op, lhs, rhs)
+ } else {
+ make_unop("!", self)
+ }
+ }
+}
+
+/// Helper type to display either `foo` or `(foo)`.
+struct ParenHelper<T> {
+ /// `true` if parentheses are needed.
+ paren: bool,
+ /// The main thing to display.
+ wrapped: T,
+}
+
+impl<T> ParenHelper<T> {
+ /// Builds a `ParenHelper`.
+ fn new(paren: bool, wrapped: T) -> Self {
+ Self { paren, wrapped }
+ }
+}
+
+impl<T: Display> Display for ParenHelper<T> {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+ if self.paren {
+ write!(f, "({})", self.wrapped)
+ } else {
+ self.wrapped.fmt(f)
+ }
+ }
+}
+
+/// Builds the string for `<op><expr>` adding parenthesis when necessary.
+///
+/// For convenience, the operator is taken as a string because all unary
+/// operators have the same
+/// precedence.
+pub fn make_unop(op: &str, expr: Sugg<'_>) -> Sugg<'static> {
+ Sugg::MaybeParen(format!("{}{}", op, expr.maybe_par()).into())
+}
+
+/// Builds the string for `<lhs> <op> <rhs>` adding parenthesis when necessary.
+///
+/// Precedence of shift operator relative to other arithmetic operation is
+/// often confusing so
+/// parenthesis will always be added for a mix of these.
+pub fn make_assoc(op: AssocOp, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ /// Returns `true` if the operator is a shift operator `<<` or `>>`.
+ fn is_shift(op: AssocOp) -> bool {
+ matches!(op, AssocOp::ShiftLeft | AssocOp::ShiftRight)
+ }
+
+ /// Returns `true` if the operator is an arithmetic operator
+ /// (i.e., `+`, `-`, `*`, `/`, `%`).
+ fn is_arith(op: AssocOp) -> bool {
+ matches!(
+ op,
+ AssocOp::Add | AssocOp::Subtract | AssocOp::Multiply | AssocOp::Divide | AssocOp::Modulus
+ )
+ }
+
+ /// Returns `true` if the operator `op` needs parenthesis with the operator
+ /// `other` in the direction `dir`.
+ fn needs_paren(op: AssocOp, other: AssocOp, dir: Associativity) -> bool {
+ other.precedence() < op.precedence()
+ || (other.precedence() == op.precedence()
+ && ((op != other && associativity(op) != dir)
+ || (op == other && associativity(op) != Associativity::Both)))
+ || is_shift(op) && is_arith(other)
+ || is_shift(other) && is_arith(op)
+ }
+
+ let lhs_paren = if let Sugg::BinOp(lop, _, _) = *lhs {
+ needs_paren(op, lop, Associativity::Left)
+ } else {
+ false
+ };
+
+ let rhs_paren = if let Sugg::BinOp(rop, _, _) = *rhs {
+ needs_paren(op, rop, Associativity::Right)
+ } else {
+ false
+ };
+
+ let lhs = ParenHelper::new(lhs_paren, lhs).to_string();
+ let rhs = ParenHelper::new(rhs_paren, rhs).to_string();
+ Sugg::BinOp(op, lhs.into(), rhs.into())
+}
+
+/// Convenience wrapper around `make_assoc` and `AssocOp::from_ast_binop`.
+pub fn make_binop(op: ast::BinOpKind, lhs: &Sugg<'_>, rhs: &Sugg<'_>) -> Sugg<'static> {
+ make_assoc(AssocOp::from_ast_binop(op), lhs, rhs)
+}
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+/// Operator associativity.
+enum Associativity {
+ /// The operator is both left-associative and right-associative.
+ Both,
+ /// The operator is left-associative.
+ Left,
+ /// The operator is not associative.
+ None,
+ /// The operator is right-associative.
+ Right,
+}
+
+/// Returns the associativity/fixity of an operator. The difference with
+/// `AssocOp::fixity` is that an operator can be both left and right associative
+/// (such as `+`: `a + b + c == (a + b) + c == a + (b + c)`.
+///
+/// Chained `as` and explicit `:` type coercion never need inner parenthesis so
+/// they are considered
+/// associative.
+#[must_use]
+fn associativity(op: AssocOp) -> Associativity {
+ use rustc_ast::util::parser::AssocOp::{
+ Add, As, Assign, AssignOp, BitAnd, BitOr, BitXor, Colon, Divide, DotDot, DotDotEq, Equal, Greater,
+ GreaterEqual, LAnd, LOr, Less, LessEqual, Modulus, Multiply, NotEqual, ShiftLeft, ShiftRight, Subtract,
+ };
+
+ match op {
+ Assign | AssignOp(_) => Associativity::Right,
+ Add | BitAnd | BitOr | BitXor | LAnd | LOr | Multiply | As | Colon => Associativity::Both,
+ Divide | Equal | Greater | GreaterEqual | Less | LessEqual | Modulus | NotEqual | ShiftLeft | ShiftRight
+ | Subtract => Associativity::Left,
+ DotDot | DotDotEq => Associativity::None,
+ }
+}
+
+/// Converts a `hir::BinOp` to the corresponding assigning binary operator.
+fn hirbinop2assignop(op: hir::BinOp) -> AssocOp {
+ use rustc_ast::token::BinOpToken::{And, Caret, Minus, Or, Percent, Plus, Shl, Shr, Slash, Star};
+
+ AssocOp::AssignOp(match op.node {
+ hir::BinOpKind::Add => Plus,
+ hir::BinOpKind::BitAnd => And,
+ hir::BinOpKind::BitOr => Or,
+ hir::BinOpKind::BitXor => Caret,
+ hir::BinOpKind::Div => Slash,
+ hir::BinOpKind::Mul => Star,
+ hir::BinOpKind::Rem => Percent,
+ hir::BinOpKind::Shl => Shl,
+ hir::BinOpKind::Shr => Shr,
+ hir::BinOpKind::Sub => Minus,
+
+ hir::BinOpKind::And
+ | hir::BinOpKind::Eq
+ | hir::BinOpKind::Ge
+ | hir::BinOpKind::Gt
+ | hir::BinOpKind::Le
+ | hir::BinOpKind::Lt
+ | hir::BinOpKind::Ne
+ | hir::BinOpKind::Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Converts an `ast::BinOp` to the corresponding assigning binary operator.
+fn astbinop2assignop(op: ast::BinOp) -> AssocOp {
+ use rustc_ast::ast::BinOpKind::{
+ Add, And, BitAnd, BitOr, BitXor, Div, Eq, Ge, Gt, Le, Lt, Mul, Ne, Or, Rem, Shl, Shr, Sub,
+ };
+ use rustc_ast::token::BinOpToken;
+
+ AssocOp::AssignOp(match op.node {
+ Add => BinOpToken::Plus,
+ BitAnd => BinOpToken::And,
+ BitOr => BinOpToken::Or,
+ BitXor => BinOpToken::Caret,
+ Div => BinOpToken::Slash,
+ Mul => BinOpToken::Star,
+ Rem => BinOpToken::Percent,
+ Shl => BinOpToken::Shl,
+ Shr => BinOpToken::Shr,
+ Sub => BinOpToken::Minus,
+ And | Eq | Ge | Gt | Le | Lt | Ne | Or => panic!("This operator does not exist"),
+ })
+}
+
+/// Returns the indentation before `span` if there are nothing but `[ \t]`
+/// before it on its line.
+fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> {
+ let lo = cx.sess().source_map().lookup_char_pos(span.lo());
+ lo.file
+ .get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */)
+ .and_then(|line| {
+ if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') {
+ // We can mix char and byte positions here because we only consider `[ \t]`.
+ if lo.col == CharPos(pos) {
+ Some(line[..pos].into())
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ })
+}
+
+/// Convenience extension trait for `DiagnosticBuilder`.
+pub trait DiagnosticBuilderExt<T: LintContext> {
+ /// Suggests to add an attribute to an item.
+ ///
+ /// Correctly handles indentation of the attribute and item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_item_with_attr(cx, item, "#[derive(Default)]");
+ /// ```
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ );
+
+ /// Suggest to add an item before another.
+ ///
+ /// The item should not be indented (except for inner indentation).
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_prepend_item(cx, item,
+ /// "fn foo() {
+ /// bar();
+ /// }");
+ /// ```
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability);
+
+ /// Suggest to completely remove an item.
+ ///
+ /// This will remove an item and all following whitespace until the next non-whitespace
+ /// character. This should work correctly if item is on the same indentation level as the
+ /// following item.
+ ///
+ /// # Example
+ ///
+ /// ```rust,ignore
+ /// diag.suggest_remove_item(cx, item, "remove this")
+ /// ```
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability);
+}
+
+impl<T: LintContext> DiagnosticBuilderExt<T> for rustc_errors::DiagnosticBuilder<'_> {
+ fn suggest_item_with_attr<D: Display + ?Sized>(
+ &mut self,
+ cx: &T,
+ item: Span,
+ msg: &str,
+ attr: &D,
+ applicability: Applicability,
+ ) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ self.span_suggestion(span, msg, format!("{}\n{}", attr, indent), applicability);
+ }
+ }
+
+ fn suggest_prepend_item(&mut self, cx: &T, item: Span, msg: &str, new_item: &str, applicability: Applicability) {
+ if let Some(indent) = indentation(cx, item) {
+ let span = item.with_hi(item.lo());
+
+ let mut first = true;
+ let new_item = new_item
+ .lines()
+ .map(|l| {
+ if first {
+ first = false;
+ format!("{}\n", l)
+ } else {
+ format!("{}{}\n", indent, l)
+ }
+ })
+ .collect::<String>();
+
+ self.span_suggestion(span, msg, format!("{}\n{}", new_item, indent), applicability);
+ }
+ }
+
+ fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability) {
+ let mut remove_span = item;
+ let hi = cx.sess().source_map().next_point(remove_span).hi();
+ let fmpos = cx.sess().source_map().lookup_byte_offset(hi);
+
+ if let Some(ref src) = fmpos.sf.src {
+ let non_whitespace_offset = src[fmpos.pos.to_usize()..].find(|c| c != ' ' && c != '\t' && c != '\n');
+
+ if let Some(non_whitespace_offset) = non_whitespace_offset {
+ remove_span = remove_span
+ .with_hi(remove_span.hi() + BytePos(non_whitespace_offset.try_into().expect("offset too large")));
+ }
+ }
+
+ self.span_suggestion(remove_span, msg, String::new(), applicability);
+ }
+}
+
+/// Suggestion results for handling closure
+/// args dereferencing and borrowing
+pub struct DerefClosure {
+ /// confidence on the built suggestion
+ pub applicability: Applicability,
+ /// gradually built suggestion
+ pub suggestion: String,
+}
+
+/// Build suggestion gradually by handling closure arg specific usages,
+/// such as explicit deref and borrowing cases.
+/// Returns `None` if no such use cases have been triggered in closure body
+///
+/// note: this only works on single line immutable closures with exactly one input parameter.
+pub fn deref_closure_args<'tcx>(cx: &LateContext<'_>, closure: &'tcx hir::Expr<'_>) -> Option<DerefClosure> {
+ if let hir::ExprKind::Closure(_, fn_decl, body_id, ..) = closure.kind {
+ let closure_body = cx.tcx.hir().body(body_id);
+ // is closure arg a type annotated double reference (i.e.: `|x: &&i32| ...`)
+ // a type annotation is present if param `kind` is different from `TyKind::Infer`
+ let closure_arg_is_type_annotated_double_ref = if let TyKind::Rptr(_, MutTy { ty, .. }) = fn_decl.inputs[0].kind
+ {
+ matches!(ty.kind, TyKind::Rptr(_, MutTy { .. }))
+ } else {
+ false
+ };
+
+ let mut visitor = DerefDelegate {
+ cx,
+ closure_span: closure.span,
+ closure_arg_is_type_annotated_double_ref,
+ next_pos: closure.span.lo(),
+ suggestion_start: String::new(),
+ applicability: Applicability::MaybeIncorrect,
+ };
+
+ let fn_def_id = cx.tcx.hir().local_def_id(closure.hir_id);
+ cx.tcx.infer_ctxt().enter(|infcx| {
+ ExprUseVisitor::new(&mut visitor, &infcx, fn_def_id, cx.param_env, cx.typeck_results())
+ .consume_body(closure_body);
+ });
+
+ if !visitor.suggestion_start.is_empty() {
+ return Some(DerefClosure {
+ applicability: visitor.applicability,
+ suggestion: visitor.finish(),
+ });
+ }
+ }
+ None
+}
+
+/// Visitor struct used for tracking down
+/// dereferencing and borrowing of closure's args
+struct DerefDelegate<'a, 'tcx> {
+ /// The late context of the lint
+ cx: &'a LateContext<'tcx>,
+ /// The span of the input closure to adapt
+ closure_span: Span,
+ /// Indicates if the arg of the closure is a type annotated double reference
+ closure_arg_is_type_annotated_double_ref: bool,
+ /// last position of the span to gradually build the suggestion
+ next_pos: BytePos,
+ /// starting part of the gradually built suggestion
+ suggestion_start: String,
+ /// confidence on the built suggestion
+ applicability: Applicability,
+}
+
+impl<'tcx> DerefDelegate<'_, 'tcx> {
+ /// build final suggestion:
+ /// - create the ending part of suggestion
+ /// - concatenate starting and ending parts
+ /// - potentially remove needless borrowing
+ pub fn finish(&mut self) -> String {
+ let end_span = Span::new(self.next_pos, self.closure_span.hi(), self.closure_span.ctxt(), None);
+ let end_snip = snippet_with_applicability(self.cx, end_span, "..", &mut self.applicability);
+ let sugg = format!("{}{}", self.suggestion_start, end_snip);
+ if self.closure_arg_is_type_annotated_double_ref {
+ sugg.replacen('&', "", 1)
+ } else {
+ sugg
+ }
+ }
+
+ /// indicates whether the function from `parent_expr` takes its args by double reference
+ fn func_takes_arg_by_double_ref(&self, parent_expr: &'tcx hir::Expr<'_>, cmt_hir_id: HirId) -> bool {
+ let (call_args, inputs) = match parent_expr.kind {
+ ExprKind::MethodCall(_, call_args, _) => {
+ if let Some(method_did) = self.cx.typeck_results().type_dependent_def_id(parent_expr.hir_id) {
+ (call_args, self.cx.tcx.fn_sig(method_did).skip_binder().inputs())
+ } else {
+ return false;
+ }
+ },
+ ExprKind::Call(func, call_args) => {
+ let typ = self.cx.typeck_results().expr_ty(func);
+ (call_args, typ.fn_sig(self.cx.tcx).skip_binder().inputs())
+ },
+ _ => return false,
+ };
+
+ iter::zip(call_args, inputs)
+ .any(|(arg, ty)| arg.hir_id == cmt_hir_id && matches!(ty.kind(), ty::Ref(_, inner, _) if inner.is_ref()))
+ }
+}
+
+impl<'tcx> Delegate<'tcx> for DerefDelegate<'_, 'tcx> {
+ fn consume(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
+ #[allow(clippy::too_many_lines)]
+ fn borrow(&mut self, cmt: &PlaceWithHirId<'tcx>, _: HirId, _: ty::BorrowKind) {
+ if let PlaceBase::Local(id) = cmt.place.base {
+ let map = self.cx.tcx.hir();
+ let span = map.span(cmt.hir_id);
+ let start_span = Span::new(self.next_pos, span.lo(), span.ctxt(), None);
+ let mut start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+
+ // identifier referring to the variable currently triggered (i.e.: `fp`)
+ let ident_str = map.name(id).to_string();
+ // full identifier that includes projection (i.e.: `fp.field`)
+ let ident_str_with_proj = snippet(self.cx, span, "..").to_string();
+
+ if cmt.place.projections.is_empty() {
+ // handle item without any projection, that needs an explicit borrowing
+ // i.e.: suggest `&x` instead of `x`
+ self.suggestion_start.push_str(&format!("{}&{}", start_snip, ident_str));
+ } else {
+ // cases where a parent `Call` or `MethodCall` is using the item
+ // i.e.: suggest `.contains(&x)` for `.find(|x| [1, 2, 3].contains(x)).is_none()`
+ //
+ // Note about method calls:
+ // - compiler automatically dereference references if the target type is a reference (works also for
+ // function call)
+ // - `self` arguments in the case of `x.is_something()` are also automatically (de)referenced, and
+ // no projection should be suggested
+ if let Some(parent_expr) = get_parent_expr_for_hir(self.cx, cmt.hir_id) {
+ match &parent_expr.kind {
+ // given expression is the self argument and will be handled completely by the compiler
+ // i.e.: `|x| x.is_something()`
+ ExprKind::MethodCall(_, [self_expr, ..], _) if self_expr.hir_id == cmt.hir_id => {
+ self.suggestion_start
+ .push_str(&format!("{}{}", start_snip, ident_str_with_proj));
+ self.next_pos = span.hi();
+ return;
+ },
+ // item is used in a call
+ // i.e.: `Call`: `|x| please(x)` or `MethodCall`: `|x| [1, 2, 3].contains(x)`
+ ExprKind::Call(_, [call_args @ ..]) | ExprKind::MethodCall(_, [_, call_args @ ..], _) => {
+ let expr = self.cx.tcx.hir().expect_expr(cmt.hir_id);
+ let arg_ty_kind = self.cx.typeck_results().expr_ty(expr).kind();
+
+ if matches!(arg_ty_kind, ty::Ref(_, _, Mutability::Not)) {
+ // suggest ampersand if call function is taking args by double reference
+ let takes_arg_by_double_ref =
+ self.func_takes_arg_by_double_ref(parent_expr, cmt.hir_id);
+
+ // compiler will automatically dereference field or index projection, so no need
+ // to suggest ampersand, but full identifier that includes projection is required
+ let has_field_or_index_projection =
+ cmt.place.projections.iter().any(|proj| {
+ matches!(proj.kind, ProjectionKind::Field(..) | ProjectionKind::Index)
+ });
+
+ // no need to bind again if the function doesn't take arg by double ref
+ // and if the item is already a double ref
+ let ident_sugg = if !call_args.is_empty()
+ && !takes_arg_by_double_ref
+ && (self.closure_arg_is_type_annotated_double_ref || has_field_or_index_projection)
+ {
+ let ident = if has_field_or_index_projection {
+ ident_str_with_proj
+ } else {
+ ident_str
+ };
+ format!("{}{}", start_snip, ident)
+ } else {
+ format!("{}&{}", start_snip, ident_str)
+ };
+ self.suggestion_start.push_str(&ident_sugg);
+ self.next_pos = span.hi();
+ return;
+ }
+
+ self.applicability = Applicability::Unspecified;
+ },
+ _ => (),
+ }
+ }
+
+ let mut replacement_str = ident_str;
+ let mut projections_handled = false;
+ cmt.place.projections.iter().enumerate().for_each(|(i, proj)| {
+ match proj.kind {
+ // Field projection like `|v| v.foo`
+ // no adjustment needed here, as field projections are handled by the compiler
+ ProjectionKind::Field(..) => match cmt.place.ty_before_projection(i).kind() {
+ ty::Adt(..) | ty::Tuple(_) => {
+ replacement_str = ident_str_with_proj.clone();
+ projections_handled = true;
+ },
+ _ => (),
+ },
+ // Index projection like `|x| foo[x]`
+ // the index is dropped so we can't get it to build the suggestion,
+ // so the span is set-up again to get more code, using `span.hi()` (i.e.: `foo[x]`)
+ // instead of `span.lo()` (i.e.: `foo`)
+ ProjectionKind::Index => {
+ let start_span = Span::new(self.next_pos, span.hi(), span.ctxt(), None);
+ start_snip = snippet_with_applicability(self.cx, start_span, "..", &mut self.applicability);
+ replacement_str.clear();
+ projections_handled = true;
+ },
+ // note: unable to trigger `Subslice` kind in tests
+ ProjectionKind::Subslice => (),
+ ProjectionKind::Deref => {
+ // Explicit derefs are typically handled later on, but
+ // some items do not need explicit deref, such as array accesses,
+ // so we mark them as already processed
+ // i.e.: don't suggest `*sub[1..4].len()` for `|sub| sub[1..4].len() == 3`
+ if let ty::Ref(_, inner, _) = cmt.place.ty_before_projection(i).kind() {
+ if matches!(inner.kind(), ty::Ref(_, innermost, _) if innermost.is_array()) {
+ projections_handled = true;
+ }
+ }
+ },
+ }
+ });
+
+ // handle `ProjectionKind::Deref` by removing one explicit deref
+ // if no special case was detected (i.e.: suggest `*x` instead of `**x`)
+ if !projections_handled {
+ let last_deref = cmt
+ .place
+ .projections
+ .iter()
+ .rposition(|proj| proj.kind == ProjectionKind::Deref);
+
+ if let Some(pos) = last_deref {
+ let mut projections = cmt.place.projections.clone();
+ projections.truncate(pos);
+
+ for item in projections {
+ if item.kind == ProjectionKind::Deref {
+ replacement_str = format!("*{}", replacement_str);
+ }
+ }
+ }
+ }
+
+ self.suggestion_start
+ .push_str(&format!("{}{}", start_snip, replacement_str));
+ }
+ self.next_pos = span.hi();
+ }
+ }
+
+ fn mutate(&mut self, _: &PlaceWithHirId<'tcx>, _: HirId) {}
+
+ fn fake_read(&mut self, _: rustc_typeck::expr_use_visitor::Place<'tcx>, _: FakeReadCause, _: HirId) {}
+}
+
+#[cfg(test)]
+mod test {
+ use super::Sugg;
+
+ use rustc_ast::util::parser::AssocOp;
+ use std::borrow::Cow;
+
+ const SUGGESTION: Sugg<'static> = Sugg::NonParen(Cow::Borrowed("function_call()"));
+
+ #[test]
+ fn make_return_transform_sugg_into_a_return_call() {
+ assert_eq!("return function_call()", SUGGESTION.make_return().to_string());
+ }
+
+ #[test]
+ fn blockify_transforms_sugg_into_a_block() {
+ assert_eq!("{ function_call() }", SUGGESTION.blockify().to_string());
+ }
+
+ #[test]
+ fn binop_maybe_par() {
+ let sugg = Sugg::BinOp(AssocOp::Add, "1".into(), "1".into());
+ assert_eq!("(1 + 1)", sugg.maybe_par().to_string());
+
+ let sugg = Sugg::BinOp(AssocOp::Add, "(1 + 1)".into(), "(1 + 1)".into());
+ assert_eq!("((1 + 1) + (1 + 1))", sugg.maybe_par().to_string());
+ }
+ #[test]
+ fn not_op() {
+ use AssocOp::{Add, Equal, Greater, GreaterEqual, LAnd, LOr, Less, LessEqual, NotEqual};
+
+ fn test_not(op: AssocOp, correct: &str) {
+ let sugg = Sugg::BinOp(op, "x".into(), "y".into());
+ assert_eq!((!sugg).to_string(), correct);
+ }
+
+ // Invert the comparison operator.
+ test_not(Equal, "x != y");
+ test_not(NotEqual, "x == y");
+ test_not(Less, "x >= y");
+ test_not(LessEqual, "x > y");
+ test_not(Greater, "x <= y");
+ test_not(GreaterEqual, "x < y");
+
+ // Other operators are inverted like !(..).
+ test_not(Add, "!(x + y)");
+ test_not(LAnd, "!(x && y)");
+ test_not(LOr, "!(x || y)");
+ }
+}
--- /dev/null
- use rustc_hir::{TyKind, Unsafety};
+//! Util methods for [`rustc_middle::ty`]
+
+#![allow(clippy::module_name_repetitions)]
+
+use rustc_ast::ast::Mutability;
+use rustc_data_structures::fx::FxHashMap;
+use rustc_hir as hir;
++use rustc_hir::def::{CtorKind, DefKind, Res};
+use rustc_hir::def_id::DefId;
- use rustc_middle::ty::subst::{GenericArg, GenericArgKind};
- use rustc_middle::ty::{self, AdtDef, IntTy, Predicate, Ty, TyCtxt, TypeFoldable, UintTy};
++use rustc_hir::{Expr, TyKind, Unsafety};
+use rustc_infer::infer::TyCtxtInferExt;
+use rustc_lint::LateContext;
- use crate::{match_def_path, must_use_attr};
++use rustc_middle::ty::subst::{GenericArg, GenericArgKind, Subst};
++use rustc_middle::ty::{
++ self, AdtDef, Binder, FnSig, IntTy, Predicate, PredicateKind, Ty, TyCtxt, TypeFoldable, UintTy,
++};
+use rustc_span::symbol::Ident;
+use rustc_span::{sym, Span, Symbol, DUMMY_SP};
+use rustc_trait_selection::infer::InferCtxtExt;
+use rustc_trait_selection::traits::query::normalize::AtExt;
+use std::iter;
+
++use crate::{expr_path_res, match_def_path, must_use_attr};
+
+// Checks if the given type implements copy.
+pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ ty.is_copy_modulo_regions(cx.tcx.at(DUMMY_SP), cx.param_env)
+}
+
+/// Checks whether a type can be partially moved.
+pub fn can_partially_move_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ if has_drop(cx, ty) || is_copy(cx, ty) {
+ return false;
+ }
+ match ty.kind() {
+ ty::Param(_) => false,
+ ty::Adt(def, subs) => def.all_fields().any(|f| !is_copy(cx, f.ty(cx.tcx, subs))),
+ _ => true,
+ }
+}
+
+/// Walks into `ty` and returns `true` if any inner type is the same as `other_ty`
+pub fn contains_ty(ty: Ty<'_>, other_ty: Ty<'_>) -> bool {
+ ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => ty::TyS::same_type(other_ty, inner_ty),
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ })
+}
+
+/// Walks into `ty` and returns `true` if any inner type is an instance of the given adt
+/// constructor.
+pub fn contains_adt_constructor(ty: Ty<'_>, adt: &AdtDef) -> bool {
+ ty.walk().any(|inner| match inner.unpack() {
+ GenericArgKind::Type(inner_ty) => inner_ty.ty_adt_def() == Some(adt),
+ GenericArgKind::Lifetime(_) | GenericArgKind::Const(_) => false,
+ })
+}
+
+/// Resolves `<T as Iterator>::Item` for `T`
+/// Do not invoke without first verifying that the type implements `Iterator`
+pub fn get_iterator_item_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'tcx>> {
+ cx.tcx
+ .get_diagnostic_item(sym::Iterator)
+ .and_then(|iter_did| get_associated_type(cx, ty, iter_did, "Item"))
+}
+
+/// Returns the associated type `name` for `ty` as an implementation of `trait_id`.
+/// Do not invoke without first verifying that the type implements the trait.
+pub fn get_associated_type<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ name: &str,
+) -> Option<Ty<'tcx>> {
+ cx.tcx
+ .associated_items(trait_id)
+ .find_by_name_and_kind(cx.tcx, Ident::from_str(name), ty::AssocKind::Type, trait_id)
+ .map(|assoc| {
+ let proj = cx.tcx.mk_projection(assoc.def_id, cx.tcx.mk_substs_trait(ty, &[]));
+ cx.tcx.normalize_erasing_regions(cx.param_env, proj)
+ })
+}
+
+/// Returns true if ty has `iter` or `iter_mut` methods
+pub fn has_iter_method(cx: &LateContext<'_>, probably_ref_ty: Ty<'_>) -> Option<Symbol> {
+ // FIXME: instead of this hard-coded list, we should check if `<adt>::iter`
+ // exists and has the desired signature. Unfortunately FnCtxt is not exported
+ // so we can't use its `lookup_method` method.
+ let into_iter_collections: &[Symbol] = &[
+ sym::Vec,
+ sym::Option,
+ sym::Result,
+ sym::BTreeMap,
+ sym::BTreeSet,
+ sym::VecDeque,
+ sym::LinkedList,
+ sym::BinaryHeap,
+ sym::HashSet,
+ sym::HashMap,
+ sym::PathBuf,
+ sym::Path,
+ sym::Receiver,
+ ];
+
+ let ty_to_check = match probably_ref_ty.kind() {
+ ty::Ref(_, ty_to_check, _) => ty_to_check,
+ _ => probably_ref_ty,
+ };
+
+ let def_id = match ty_to_check.kind() {
+ ty::Array(..) => return Some(sym::array),
+ ty::Slice(..) => return Some(sym::slice),
+ ty::Adt(adt, _) => adt.did,
+ _ => return None,
+ };
+
+ for &name in into_iter_collections {
+ if cx.tcx.is_diagnostic_item(name, def_id) {
+ return Some(cx.tcx.item_name(def_id));
+ }
+ }
+ None
+}
+
+/// Checks whether a type implements a trait.
+/// The function returns false in case the type contains an inference variable.
+///
+/// See:
+/// * [`get_trait_def_id`](super::get_trait_def_id) to get a trait [`DefId`].
+/// * [Common tools for writing lints] for an example how to use this function and other options.
+///
+/// [Common tools for writing lints]: https://github.com/rust-lang/rust-clippy/blob/master/doc/common_tools_writing_lints.md#checking-if-a-type-implements-a-specific-trait
+pub fn implements_trait<'tcx>(
+ cx: &LateContext<'tcx>,
+ ty: Ty<'tcx>,
+ trait_id: DefId,
+ ty_params: &[GenericArg<'tcx>],
+) -> bool {
+ // Clippy shouldn't have infer types
+ assert!(!ty.needs_infer());
+
+ let ty = cx.tcx.erase_regions(ty);
+ if ty.has_escaping_bound_vars() {
+ return false;
+ }
+ let ty_params = cx.tcx.mk_substs(ty_params.iter());
+ cx.tcx.infer_ctxt().enter(|infcx| {
+ infcx
+ .type_implements_trait(trait_id, ty, ty_params, cx.param_env)
+ .must_apply_modulo_regions()
+ })
+}
+
+/// Checks whether this type implements `Drop`.
+pub fn has_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.ty_adt_def() {
+ Some(def) => def.has_dtor(cx.tcx),
+ None => false,
+ }
+}
+
+// Returns whether the type has #[must_use] attribute
+pub fn is_must_use_ty<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => must_use_attr(cx.tcx.get_attrs(adt.did)).is_some(),
+ ty::Foreign(ref did) => must_use_attr(cx.tcx.get_attrs(*did)).is_some(),
+ ty::Slice(ty) | ty::Array(ty, _) | ty::RawPtr(ty::TypeAndMut { ty, .. }) | ty::Ref(_, ty, _) => {
+ // for the Array case we don't need to care for the len == 0 case
+ // because we don't want to lint functions returning empty arrays
+ is_must_use_ty(cx, *ty)
+ },
+ ty::Tuple(substs) => substs.types().any(|ty| is_must_use_ty(cx, ty)),
+ ty::Opaque(ref def_id, _) => {
+ for (predicate, _) in cx.tcx.explicit_item_bounds(*def_id) {
+ if let ty::PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder() {
+ if must_use_attr(cx.tcx.get_attrs(trait_predicate.trait_ref.def_id)).is_some() {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ ty::Dynamic(binder, _) => {
+ for predicate in binder.iter() {
+ if let ty::ExistentialPredicate::Trait(ref trait_ref) = predicate.skip_binder() {
+ if must_use_attr(cx.tcx.get_attrs(trait_ref.def_id)).is_some() {
+ return true;
+ }
+ }
+ }
+ false
+ },
+ _ => false,
+ }
+}
+
+// FIXME: Per https://doc.rust-lang.org/nightly/nightly-rustc/rustc_trait_selection/infer/at/struct.At.html#method.normalize
+// this function can be removed once the `normalize` method does not panic when normalization does
+// not succeed
+/// Checks if `Ty` is normalizable. This function is useful
+/// to avoid crashes on `layout_of`.
+pub fn is_normalizable<'tcx>(cx: &LateContext<'tcx>, param_env: ty::ParamEnv<'tcx>, ty: Ty<'tcx>) -> bool {
+ is_normalizable_helper(cx, param_env, ty, &mut FxHashMap::default())
+}
+
+fn is_normalizable_helper<'tcx>(
+ cx: &LateContext<'tcx>,
+ param_env: ty::ParamEnv<'tcx>,
+ ty: Ty<'tcx>,
+ cache: &mut FxHashMap<Ty<'tcx>, bool>,
+) -> bool {
+ if let Some(&cached_result) = cache.get(ty) {
+ return cached_result;
+ }
+ // prevent recursive loops, false-negative is better than endless loop leading to stack overflow
+ cache.insert(ty, false);
+ let result = cx.tcx.infer_ctxt().enter(|infcx| {
+ let cause = rustc_middle::traits::ObligationCause::dummy();
+ if infcx.at(&cause, param_env).normalize(ty).is_ok() {
+ match ty.kind() {
+ ty::Adt(def, substs) => def.variants.iter().all(|variant| {
+ variant
+ .fields
+ .iter()
+ .all(|field| is_normalizable_helper(cx, param_env, field.ty(cx.tcx, substs), cache))
+ }),
+ _ => ty.walk().all(|generic_arg| match generic_arg.unpack() {
+ GenericArgKind::Type(inner_ty) if inner_ty != ty => {
+ is_normalizable_helper(cx, param_env, inner_ty, cache)
+ },
+ _ => true, // if inner_ty == ty, we've already checked it
+ }),
+ }
+ } else {
+ false
+ }
+ });
+ cache.insert(ty, result);
+ result
+}
+
+/// Returns `true` if the given type is a non aggregate primitive (a `bool` or `char`, any
+/// integer or floating-point number type). For checking aggregation of primitive types (e.g.
+/// tuples and slices of primitive type) see `is_recursively_primitive_type`
+pub fn is_non_aggregate_primitive_type(ty: Ty<'_>) -> bool {
+ matches!(ty.kind(), ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_))
+}
+
+/// Returns `true` if the given type is a primitive (a `bool` or `char`, any integer or
+/// floating-point number type, a `str`, or an array, slice, or tuple of those types).
+pub fn is_recursively_primitive_type(ty: Ty<'_>) -> bool {
+ match ty.kind() {
+ ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) | ty::Str => true,
+ ty::Ref(_, inner, _) if *inner.kind() == ty::Str => true,
+ ty::Array(inner_type, _) | ty::Slice(inner_type) => is_recursively_primitive_type(inner_type),
+ ty::Tuple(inner_types) => inner_types.types().all(is_recursively_primitive_type),
+ _ => false,
+ }
+}
+
+/// Checks if the type is a reference equals to a diagnostic item
+pub fn is_type_ref_to_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Ref(_, ref_ty, _) => match ref_ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did),
+ _ => false,
+ },
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a diagnostic item. To check if a type implements a
+/// trait marked with a diagnostic item use [`implements_trait`].
+///
+/// For a further exploitation what diagnostic items are see [diagnostic items] in
+/// rustc-dev-guide.
+///
+/// ---
+///
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+///
+/// [Diagnostic Items]: https://rustc-dev-guide.rust-lang.org/diagnostics/diagnostic-items.html
+pub fn is_type_diagnostic_item(cx: &LateContext<'_>, ty: Ty<'_>, diag_item: Symbol) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(diag_item, adt.did),
+ _ => false,
+ }
+}
+
+/// Checks if the type is equal to a lang item.
+///
+/// Returns `false` if the `LangItem` is not defined.
+pub fn is_type_lang_item(cx: &LateContext<'_>, ty: Ty<'_>, lang_item: hir::LangItem) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => cx.tcx.lang_items().require(lang_item).map_or(false, |li| li == adt.did),
+ _ => false,
+ }
+}
+
+/// Return `true` if the passed `typ` is `isize` or `usize`.
+pub fn is_isize_or_usize(typ: Ty<'_>) -> bool {
+ matches!(typ.kind(), ty::Int(IntTy::Isize) | ty::Uint(UintTy::Usize))
+}
+
+/// Checks if type is struct, enum or union type with the given def path.
+///
+/// If the type is a diagnostic item, use `is_type_diagnostic_item` instead.
+/// If you change the signature, remember to update the internal lint `MatchTypeOnDiagItem`
+pub fn match_type(cx: &LateContext<'_>, ty: Ty<'_>, path: &[&str]) -> bool {
+ match ty.kind() {
+ ty::Adt(adt, _) => match_def_path(cx, adt.did, path),
+ _ => false,
+ }
+}
+
+/// Peels off all references on the type. Returns the underlying type and the number of references
+/// removed.
+pub fn peel_mid_ty_refs(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn peel(ty: Ty<'_>, count: usize) -> (Ty<'_>, usize) {
+ if let ty::Ref(_, ty, _) = ty.kind() {
+ peel(ty, count + 1)
+ } else {
+ (ty, count)
+ }
+ }
+ peel(ty, 0)
+}
+
+/// Peels off all references on the type.Returns the underlying type, the number of references
+/// removed, and whether the pointer is ultimately mutable or not.
+pub fn peel_mid_ty_refs_is_mutable(ty: Ty<'_>) -> (Ty<'_>, usize, Mutability) {
+ fn f(ty: Ty<'_>, count: usize, mutability: Mutability) -> (Ty<'_>, usize, Mutability) {
+ match ty.kind() {
+ ty::Ref(_, ty, Mutability::Mut) => f(ty, count + 1, mutability),
+ ty::Ref(_, ty, Mutability::Not) => f(ty, count + 1, Mutability::Not),
+ _ => (ty, count, mutability),
+ }
+ }
+ f(ty, 0, Mutability::Mut)
+}
+
+/// Returns `true` if the given type is an `unsafe` function.
+pub fn type_is_unsafe_function<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
+ match ty.kind() {
+ ty::FnDef(..) | ty::FnPtr(_) => ty.fn_sig(cx.tcx).unsafety() == Unsafety::Unsafe,
+ _ => false,
+ }
+}
+
+/// Returns the base type for HIR references and pointers.
+pub fn walk_ptrs_hir_ty<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
+ match ty.kind {
+ TyKind::Ptr(ref mut_ty) | TyKind::Rptr(_, ref mut_ty) => walk_ptrs_hir_ty(mut_ty.ty),
+ _ => ty,
+ }
+}
+
+/// Returns the base type for references and raw pointers, and count reference
+/// depth.
+pub fn walk_ptrs_ty_depth(ty: Ty<'_>) -> (Ty<'_>, usize) {
+ fn inner(ty: Ty<'_>, depth: usize) -> (Ty<'_>, usize) {
+ match ty.kind() {
+ ty::Ref(_, ty, _) => inner(ty, depth + 1),
+ _ => (ty, depth),
+ }
+ }
+ inner(ty, 0)
+}
+
+/// Returns `true` if types `a` and `b` are same types having same `Const` generic args,
+/// otherwise returns `false`
+pub fn same_type_and_consts<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
+ match (&a.kind(), &b.kind()) {
+ (&ty::Adt(did_a, substs_a), &ty::Adt(did_b, substs_b)) => {
+ if did_a != did_b {
+ return false;
+ }
+
+ substs_a
+ .iter()
+ .zip(substs_b.iter())
+ .all(|(arg_a, arg_b)| match (arg_a.unpack(), arg_b.unpack()) {
+ (GenericArgKind::Const(inner_a), GenericArgKind::Const(inner_b)) => inner_a == inner_b,
+ (GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => {
+ same_type_and_consts(type_a, type_b)
+ },
+ _ => true,
+ })
+ },
+ _ => a == b,
+ }
+}
+
+/// Checks if a given type looks safe to be uninitialized.
+pub fn is_uninit_value_valid_for_ty(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
+ match ty.kind() {
+ ty::Array(component, _) => is_uninit_value_valid_for_ty(cx, component),
+ ty::Tuple(types) => types.types().all(|ty| is_uninit_value_valid_for_ty(cx, ty)),
+ ty::Adt(adt, _) => cx.tcx.lang_items().maybe_uninit() == Some(adt.did),
+ _ => false,
+ }
+}
+
+/// Gets an iterator over all predicates which apply to the given item.
+pub fn all_predicates_of(tcx: TyCtxt<'_>, id: DefId) -> impl Iterator<Item = &(Predicate<'_>, Span)> {
+ let mut next_id = Some(id);
+ iter::from_fn(move || {
+ next_id.take().map(|id| {
+ let preds = tcx.predicates_of(id);
+ next_id = preds.parent;
+ preds.predicates.iter()
+ })
+ })
+ .flatten()
+}
++
++/// A signature for a function like type.
++#[derive(Clone, Copy)]
++pub enum ExprFnSig<'tcx> {
++ Sig(Binder<'tcx, FnSig<'tcx>>),
++ Closure(Binder<'tcx, FnSig<'tcx>>),
++ Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>),
++}
++impl<'tcx> ExprFnSig<'tcx> {
++ /// Gets the argument type at the given offset.
++ pub fn input(self, i: usize) -> Binder<'tcx, Ty<'tcx>> {
++ match self {
++ Self::Sig(sig) => sig.input(i),
++ Self::Closure(sig) => sig.input(0).map_bound(|ty| ty.tuple_element_ty(i).unwrap()),
++ Self::Trait(inputs, _) => inputs.map_bound(|ty| ty.tuple_element_ty(i).unwrap()),
++ }
++ }
++
++ /// Gets the result type, if one could be found. Note that the result type of a trait may not be
++ /// specified.
++ pub fn output(self) -> Option<Binder<'tcx, Ty<'tcx>>> {
++ match self {
++ Self::Sig(sig) | Self::Closure(sig) => Some(sig.output()),
++ Self::Trait(_, output) => output,
++ }
++ }
++}
++
++/// If the expression is function like, get the signature for it.
++pub fn expr_sig<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> Option<ExprFnSig<'tcx>> {
++ if let Res::Def(DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::AssocFn, id) = expr_path_res(cx, expr) {
++ Some(ExprFnSig::Sig(cx.tcx.fn_sig(id)))
++ } else {
++ let ty = cx.typeck_results().expr_ty_adjusted(expr).peel_refs();
++ match *ty.kind() {
++ ty::Closure(_, subs) => Some(ExprFnSig::Closure(subs.as_closure().sig())),
++ ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.fn_sig(id).subst(cx.tcx, subs))),
++ ty::FnPtr(sig) => Some(ExprFnSig::Sig(sig)),
++ ty::Dynamic(bounds, _) => {
++ let lang_items = cx.tcx.lang_items();
++ match bounds.principal() {
++ Some(bound)
++ if Some(bound.def_id()) == lang_items.fn_trait()
++ || Some(bound.def_id()) == lang_items.fn_once_trait()
++ || Some(bound.def_id()) == lang_items.fn_mut_trait() =>
++ {
++ let output = bounds
++ .projection_bounds()
++ .find(|p| lang_items.fn_once_output().map_or(false, |id| id == p.item_def_id()))
++ .map(|p| p.map_bound(|p| p.term.ty().expect("return type was a const")));
++ Some(ExprFnSig::Trait(bound.map_bound(|b| b.substs.type_at(0)), output))
++ },
++ _ => None,
++ }
++ },
++ ty::Param(_) | ty::Projection(..) => {
++ let mut inputs = None;
++ let mut output = None;
++ let lang_items = cx.tcx.lang_items();
++
++ for (pred, _) in all_predicates_of(cx.tcx, cx.typeck_results().hir_owner.to_def_id()) {
++ let mut is_input = false;
++ if let Some(ty) = pred
++ .kind()
++ .map_bound(|pred| match pred {
++ PredicateKind::Trait(p)
++ if (lang_items.fn_trait() == Some(p.def_id())
++ || lang_items.fn_mut_trait() == Some(p.def_id())
++ || lang_items.fn_once_trait() == Some(p.def_id()))
++ && p.self_ty() == ty =>
++ {
++ is_input = true;
++ Some(p.trait_ref.substs.type_at(1))
++ },
++ PredicateKind::Projection(p)
++ if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output()
++ && p.projection_ty.self_ty() == ty =>
++ {
++ is_input = false;
++ p.term.ty()
++ },
++ _ => None,
++ })
++ .transpose()
++ {
++ if is_input && inputs.is_none() {
++ inputs = Some(ty);
++ } else if !is_input && output.is_none() {
++ output = Some(ty);
++ } else {
++ // Multiple different fn trait impls. Is this even allowed?
++ return None;
++ }
++ }
++ }
++
++ inputs.map(|ty| ExprFnSig::Trait(ty, output))
++ },
++ _ => None,
++ }
++ }
++}
--- /dev/null
- channel = "nightly-2022-01-13"
+[toolchain]
++channel = "nightly-2022-01-27"
+components = ["cargo", "llvm-tools-preview", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
--- /dev/null
- let clippy_tests_set = env::var("__CLIPPY_INTERNAL_TESTS").map_or(false, |val| val == "true");
+#![feature(rustc_private)]
+#![feature(once_cell)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+// warn on lints, that are included in `rust-lang/rust`s bootstrap
+#![warn(rust_2018_idioms, unused_lifetimes)]
+// warn on rustc internal lints
+#![warn(rustc::internal)]
+
+// FIXME: switch to something more ergonomic here, once available.
+// (Currently there is no way to opt into sysroot crates without `extern crate`.)
+extern crate rustc_driver;
+extern crate rustc_errors;
+extern crate rustc_interface;
+extern crate rustc_session;
+extern crate rustc_span;
+
+use rustc_interface::interface;
+use rustc_session::parse::ParseSess;
+use rustc_span::symbol::Symbol;
+use rustc_tools_util::VersionInfo;
+
+use std::borrow::Cow;
+use std::env;
+use std::lazy::SyncLazy;
+use std::ops::Deref;
+use std::panic;
+use std::path::{Path, PathBuf};
+use std::process::{exit, Command};
+
+/// If a command-line option matches `find_arg`, then apply the predicate `pred` on its value. If
+/// true, then return it. The parameter is assumed to be either `--arg=value` or `--arg value`.
+fn arg_value<'a, T: Deref<Target = str>>(
+ args: &'a [T],
+ find_arg: &str,
+ pred: impl Fn(&str) -> bool,
+) -> Option<&'a str> {
+ let mut args = args.iter().map(Deref::deref);
+ while let Some(arg) = args.next() {
+ let mut arg = arg.splitn(2, '=');
+ if arg.next() != Some(find_arg) {
+ continue;
+ }
+
+ match arg.next().or_else(|| args.next()) {
+ Some(v) if pred(v) => return Some(v),
+ _ => {},
+ }
+ }
+ None
+}
+
+#[test]
+fn test_arg_value() {
+ let args = &["--bar=bar", "--foobar", "123", "--foo"];
+
+ assert_eq!(arg_value(&[] as &[&str], "--foobar", |_| true), None);
+ assert_eq!(arg_value(args, "--bar", |_| false), None);
+ assert_eq!(arg_value(args, "--bar", |_| true), Some("bar"));
+ assert_eq!(arg_value(args, "--bar", |p| p == "bar"), Some("bar"));
+ assert_eq!(arg_value(args, "--bar", |p| p == "foo"), None);
+ assert_eq!(arg_value(args, "--foobar", |p| p == "foo"), None);
+ assert_eq!(arg_value(args, "--foobar", |p| p == "123"), Some("123"));
+ assert_eq!(arg_value(args, "--foo", |_| true), None);
+}
+
+fn track_clippy_args(parse_sess: &mut ParseSess, args_env_var: &Option<String>) {
+ parse_sess.env_depinfo.get_mut().insert((
+ Symbol::intern("CLIPPY_ARGS"),
+ args_env_var.as_deref().map(Symbol::intern),
+ ));
+}
+
+struct DefaultCallbacks;
+impl rustc_driver::Callbacks for DefaultCallbacks {}
+
+/// This is different from `DefaultCallbacks` that it will inform Cargo to track the value of
+/// `CLIPPY_ARGS` environment variable.
+struct RustcCallbacks {
+ clippy_args_var: Option<String>,
+}
+
+impl rustc_driver::Callbacks for RustcCallbacks {
+ fn config(&mut self, config: &mut interface::Config) {
+ let clippy_args_var = self.clippy_args_var.take();
+ config.parse_sess_created = Some(Box::new(move |parse_sess| {
+ track_clippy_args(parse_sess, &clippy_args_var);
+ }));
+ }
+}
+
+struct ClippyCallbacks {
+ clippy_args_var: Option<String>,
+}
+
+impl rustc_driver::Callbacks for ClippyCallbacks {
+ fn config(&mut self, config: &mut interface::Config) {
+ let previous = config.register_lints.take();
+ let clippy_args_var = self.clippy_args_var.take();
+ config.parse_sess_created = Some(Box::new(move |parse_sess| {
+ track_clippy_args(parse_sess, &clippy_args_var);
+ }));
+ config.register_lints = Some(Box::new(move |sess, lint_store| {
+ // technically we're ~guaranteed that this is none but might as well call anything that
+ // is there already. Certainly it can't hurt.
+ if let Some(previous) = &previous {
+ (previous)(sess, lint_store);
+ }
+
+ let conf = clippy_lints::read_conf(sess);
+ clippy_lints::register_plugins(lint_store, sess, &conf);
+ clippy_lints::register_pre_expansion_lints(lint_store, sess, &conf);
+ clippy_lints::register_renamed(lint_store);
+ }));
+
+ // FIXME: #4825; This is required, because Clippy lints that are based on MIR have to be
+ // run on the unoptimized MIR. On the other hand this results in some false negatives. If
+ // MIR passes can be enabled / disabled separately, we should figure out, what passes to
+ // use for Clippy.
+ config.opts.debugging_opts.mir_opt_level = Some(0);
+ }
+}
+
+fn display_help() {
+ println!(
+ "\
+Checks a package to catch common mistakes and improve your Rust code.
+
+Usage:
+ cargo clippy [options] [--] [<opts>...]
+
+Common options:
+ -h, --help Print this message
+ --rustc Pass all args to rustc
+ -V, --version Print version info and exit
+
+Other options are the same as `cargo check`.
+
+To allow or deny a lint from the command line you can use `cargo clippy --`
+with:
+
+ -W --warn OPT Set lint warnings
+ -A --allow OPT Set lint allowed
+ -D --deny OPT Set lint denied
+ -F --forbid OPT Set lint forbidden
+
+You can use tool lints to allow or deny lints from your code, eg.:
+
+ #[allow(clippy::needless_lifetimes)]
+"
+ );
+}
+
+const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust-clippy/issues/new";
+
+static ICE_HOOK: SyncLazy<Box<dyn Fn(&panic::PanicInfo<'_>) + Sync + Send + 'static>> = SyncLazy::new(|| {
+ let hook = panic::take_hook();
+ panic::set_hook(Box::new(|info| report_clippy_ice(info, BUG_REPORT_URL)));
+ hook
+});
+
+fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
+ // Invoke our ICE handler, which prints the actual panic message and optionally a backtrace
+ (*ICE_HOOK)(info);
+
+ // Separate the output with an empty line
+ eprintln!();
+
+ let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
+ rustc_errors::ColorConfig::Auto,
+ None,
+ false,
+ false,
+ None,
+ false,
+ ));
+ let handler = rustc_errors::Handler::with_emitter(true, None, emitter);
+
+ // a .span_bug or .bug call has already printed what
+ // it wants to print.
+ if !info.payload().is::<rustc_errors::ExplicitBug>() {
+ let d = rustc_errors::Diagnostic::new(rustc_errors::Level::Bug, "unexpected panic");
+ handler.emit_diagnostic(&d);
+ }
+
+ let version_info = rustc_tools_util::get_version_info!();
+
+ let xs: Vec<Cow<'static, str>> = vec![
+ "the compiler unexpectedly panicked. this is a bug.".into(),
+ format!("we would appreciate a bug report: {}", bug_report_url).into(),
+ format!("Clippy version: {}", version_info).into(),
+ ];
+
+ for note in &xs {
+ handler.note_without_error(note);
+ }
+
+ // If backtraces are enabled, also print the query stack
+ let backtrace = env::var_os("RUST_BACKTRACE").map_or(false, |x| &x != "0");
+
+ let num_frames = if backtrace { None } else { Some(2) };
+
+ interface::try_print_query_stack(&handler, num_frames);
+}
+
+fn toolchain_path(home: Option<String>, toolchain: Option<String>) -> Option<PathBuf> {
+ home.and_then(|home| {
+ toolchain.map(|toolchain| {
+ let mut path = PathBuf::from(home);
+ path.push("toolchains");
+ path.push(toolchain);
+ path
+ })
+ })
+}
+
+#[allow(clippy::too_many_lines)]
+pub fn main() {
+ rustc_driver::init_rustc_env_logger();
+ SyncLazy::force(&ICE_HOOK);
+ exit(rustc_driver::catch_with_exit_code(move || {
+ let mut orig_args: Vec<String> = env::args().collect();
+
+ // Get the sysroot, looking from most specific to this invocation to the least:
+ // - command line
+ // - runtime environment
+ // - SYSROOT
+ // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
+ // - sysroot from rustc in the path
+ // - compile-time environment
+ // - SYSROOT
+ // - RUSTUP_HOME, MULTIRUST_HOME, RUSTUP_TOOLCHAIN, MULTIRUST_TOOLCHAIN
+ let sys_root_arg = arg_value(&orig_args, "--sysroot", |_| true);
+ let have_sys_root_arg = sys_root_arg.is_some();
+ let sys_root = sys_root_arg
+ .map(PathBuf::from)
+ .or_else(|| std::env::var("SYSROOT").ok().map(PathBuf::from))
+ .or_else(|| {
+ let home = std::env::var("RUSTUP_HOME")
+ .or_else(|_| std::env::var("MULTIRUST_HOME"))
+ .ok();
+ let toolchain = std::env::var("RUSTUP_TOOLCHAIN")
+ .or_else(|_| std::env::var("MULTIRUST_TOOLCHAIN"))
+ .ok();
+ toolchain_path(home, toolchain)
+ })
+ .or_else(|| {
+ Command::new("rustc")
+ .arg("--print")
+ .arg("sysroot")
+ .output()
+ .ok()
+ .and_then(|out| String::from_utf8(out.stdout).ok())
+ .map(|s| PathBuf::from(s.trim()))
+ })
+ .or_else(|| option_env!("SYSROOT").map(PathBuf::from))
+ .or_else(|| {
+ let home = option_env!("RUSTUP_HOME")
+ .or(option_env!("MULTIRUST_HOME"))
+ .map(ToString::to_string);
+ let toolchain = option_env!("RUSTUP_TOOLCHAIN")
+ .or(option_env!("MULTIRUST_TOOLCHAIN"))
+ .map(ToString::to_string);
+ toolchain_path(home, toolchain)
+ })
+ .map(|pb| pb.to_string_lossy().to_string())
+ .expect("need to specify SYSROOT env var during clippy compilation, or use rustup or multirust");
+
+ // make "clippy-driver --rustc" work like a subcommand that passes further args to "rustc"
+ // for example `clippy-driver --rustc --version` will print the rustc version that clippy-driver
+ // uses
+ if let Some(pos) = orig_args.iter().position(|arg| arg == "--rustc") {
+ orig_args.remove(pos);
+ orig_args[0] = "rustc".to_string();
+
+ // if we call "rustc", we need to pass --sysroot here as well
+ let mut args: Vec<String> = orig_args.clone();
+ if !have_sys_root_arg {
+ args.extend(vec!["--sysroot".into(), sys_root]);
+ };
+
+ return rustc_driver::RunCompiler::new(&args, &mut DefaultCallbacks).run();
+ }
+
+ if orig_args.iter().any(|a| a == "--version" || a == "-V") {
+ let version_info = rustc_tools_util::get_version_info!();
+ println!("{}", version_info);
+ exit(0);
+ }
+
+ // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
+ // We're invoking the compiler programmatically, so we ignore this/
+ let wrapper_mode = orig_args.get(1).map(Path::new).and_then(Path::file_stem) == Some("rustc".as_ref());
+
+ if wrapper_mode {
+ // we still want to be able to invoke it normally though
+ orig_args.remove(1);
+ }
+
+ if !wrapper_mode && (orig_args.iter().any(|a| a == "--help" || a == "-h") || orig_args.len() == 1) {
+ display_help();
+ exit(0);
+ }
+
+ // this conditional check for the --sysroot flag is there so users can call
+ // `clippy_driver` directly
+ // without having to pass --sysroot or anything
+ let mut args: Vec<String> = orig_args.clone();
+ if !have_sys_root_arg {
+ args.extend(vec!["--sysroot".into(), sys_root]);
+ };
+
+ let mut no_deps = false;
+ let clippy_args_var = env::var("CLIPPY_ARGS").ok();
+ let clippy_args = clippy_args_var
+ .as_deref()
+ .unwrap_or_default()
+ .split("__CLIPPY_HACKERY__")
+ .filter_map(|s| match s {
+ "" => None,
+ "--no-deps" => {
+ no_deps = true;
+ None
+ },
+ _ => Some(s.to_string()),
+ })
+ .chain(vec!["--cfg".into(), r#"feature="cargo-clippy""#.into()])
+ .collect::<Vec<String>>();
+
+ // We enable Clippy if one of the following conditions is met
+ // - IF Clippy is run on its test suite OR
+ // - IF Clippy is run on the main crate, not on deps (`!cap_lints_allow`) THEN
+ // - IF `--no-deps` is not set (`!no_deps`) OR
+ // - IF `--no-deps` is set and Clippy is run on the specified primary package
- let clippy_enabled = clippy_tests_set || (!cap_lints_allow && (!no_deps || in_primary_package));
+ let cap_lints_allow = arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_some();
+ let in_primary_package = env::var("CARGO_PRIMARY_PACKAGE").is_ok();
+
++ let clippy_enabled = !cap_lints_allow && (!no_deps || in_primary_package);
+ if clippy_enabled {
+ args.extend(clippy_args);
+ }
+
+ if clippy_enabled {
+ rustc_driver::RunCompiler::new(&args, &mut ClippyCallbacks { clippy_args_var }).run()
+ } else {
+ rustc_driver::RunCompiler::new(&args, &mut RustcCallbacks { clippy_args_var }).run()
+ }
+ }))
+}
--- /dev/null
- fn prepare_env() {
- set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
- set_var("__CLIPPY_INTERNAL_TESTS", "true");
- //set_var("RUST_BACKTRACE", "0");
- }
-
+#![feature(test)] // compiletest_rs requires this attribute
+#![feature(once_cell)]
+#![cfg_attr(feature = "deny-warnings", deny(warnings))]
+#![warn(rust_2018_idioms, unused_lifetimes)]
+
+use compiletest_rs as compiletest;
+use compiletest_rs::common::Mode as TestMode;
+
+use std::collections::HashMap;
+use std::env::{self, remove_var, set_var, var_os};
+use std::ffi::{OsStr, OsString};
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+use test_utils::IS_RUSTC_TEST_SUITE;
+
+mod test_utils;
+
+// whether to run internal tests or not
+const RUN_INTERNAL_TESTS: bool = cfg!(feature = "internal");
+
+/// All crates used in UI tests are listed here
+static TEST_DEPENDENCIES: &[&str] = &[
+ "clippy_utils",
+ "derive_new",
+ "futures",
+ "if_chain",
+ "itertools",
+ "quote",
+ "regex",
+ "serde",
+ "serde_derive",
+ "syn",
+ "tokio",
+ "parking_lot",
+];
+
+// Test dependencies may need an `extern crate` here to ensure that they show up
+// in the depinfo file (otherwise cargo thinks they are unused)
+#[allow(unused_extern_crates)]
+extern crate clippy_utils;
+#[allow(unused_extern_crates)]
+extern crate derive_new;
+#[allow(unused_extern_crates)]
+extern crate futures;
+#[allow(unused_extern_crates)]
+extern crate if_chain;
+#[allow(unused_extern_crates)]
+extern crate itertools;
+#[allow(unused_extern_crates)]
+extern crate parking_lot;
+#[allow(unused_extern_crates)]
+extern crate quote;
+#[allow(unused_extern_crates)]
+extern crate syn;
+#[allow(unused_extern_crates)]
+extern crate tokio;
+
+/// Produces a string with an `--extern` flag for all UI test crate
+/// dependencies.
+///
+/// The dependency files are located by parsing the depinfo file for this test
+/// module. This assumes the `-Z binary-dep-depinfo` flag is enabled. All test
+/// dependencies must be added to Cargo.toml at the project root. Test
+/// dependencies that are not *directly* used by this test module require an
+/// `extern crate` declaration.
+fn extern_flags() -> String {
+ let current_exe_depinfo = {
+ let mut path = env::current_exe().unwrap();
+ path.set_extension("d");
+ std::fs::read_to_string(path).unwrap()
+ };
+ let mut crates: HashMap<&str, &str> = HashMap::with_capacity(TEST_DEPENDENCIES.len());
+ for line in current_exe_depinfo.lines() {
+ // each dependency is expected to have a Makefile rule like `/path/to/crate-hash.rlib:`
+ let parse_name_path = || {
+ if line.starts_with(char::is_whitespace) {
+ return None;
+ }
+ let path_str = line.strip_suffix(':')?;
+ let path = Path::new(path_str);
+ if !matches!(path.extension()?.to_str()?, "rlib" | "so" | "dylib" | "dll") {
+ return None;
+ }
+ let (name, _hash) = path.file_stem()?.to_str()?.rsplit_once('-')?;
+ // the "lib" prefix is not present for dll files
+ let name = name.strip_prefix("lib").unwrap_or(name);
+ Some((name, path_str))
+ };
+ if let Some((name, path)) = parse_name_path() {
+ if TEST_DEPENDENCIES.contains(&name) {
+ // A dependency may be listed twice if it is available in sysroot,
+ // and the sysroot dependencies are listed first. As of the writing,
+ // this only seems to apply to if_chain.
+ crates.insert(name, path);
+ }
+ }
+ }
+ let not_found: Vec<&str> = TEST_DEPENDENCIES
+ .iter()
+ .copied()
+ .filter(|n| !crates.contains_key(n))
+ .collect();
+ assert!(
+ not_found.is_empty(),
+ "dependencies not found in depinfo: {:?}\n\
+ help: Make sure the `-Z binary-dep-depinfo` rust flag is enabled\n\
+ help: Try adding to dev-dependencies in Cargo.toml",
+ not_found
+ );
+ crates
+ .into_iter()
+ .map(|(name, path)| format!(" --extern {}={}", name, path))
+ .collect()
+}
+
+fn default_config() -> compiletest::Config {
+ let mut config = compiletest::Config {
+ edition: Some("2021".into()),
+ ..compiletest::Config::default()
+ };
+
+ if let Ok(filters) = env::var("TESTNAME") {
+ config.filters = filters.split(',').map(std::string::ToString::to_string).collect();
+ }
+
+ if let Some(path) = option_env!("RUSTC_LIB_PATH") {
+ let path = PathBuf::from(path);
+ config.run_lib_path = path.clone();
+ config.compile_lib_path = path;
+ }
+ let current_exe_path = std::env::current_exe().unwrap();
+ let deps_path = current_exe_path.parent().unwrap();
+ let profile_path = deps_path.parent().unwrap();
+
+ // Using `-L dependency={}` enforces that external dependencies are added with `--extern`.
+ // This is valuable because a) it allows us to monitor what external dependencies are used
+ // and b) it ensures that conflicting rlibs are resolved properly.
+ let host_libs = option_env!("HOST_LIBS")
+ .map(|p| format!(" -L dependency={}", Path::new(p).join("deps").display()))
+ .unwrap_or_default();
+ config.target_rustcflags = Some(format!(
+ "--emit=metadata -Dwarnings -Zui-testing -L dependency={}{}{}",
+ deps_path.display(),
+ host_libs,
+ extern_flags(),
+ ));
+
+ config.build_base = profile_path.join("test");
+ config.rustc_path = profile_path.join(if cfg!(windows) {
+ "clippy-driver.exe"
+ } else {
+ "clippy-driver"
+ });
+ config
+}
+
+fn run_ui(cfg: &mut compiletest::Config) {
+ cfg.mode = TestMode::Ui;
+ cfg.src_base = Path::new("tests").join("ui");
+ // use tests/clippy.toml
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", std::fs::canonicalize("tests").unwrap());
+ compiletest::run_tests(cfg);
+}
+
+fn run_ui_test(cfg: &mut compiletest::Config) {
+ cfg.mode = TestMode::Ui;
+ cfg.src_base = Path::new("tests").join("ui_test");
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", std::fs::canonicalize("tests").unwrap());
+ let rustcflags = cfg.target_rustcflags.get_or_insert_with(Default::default);
+ let len = rustcflags.len();
+ rustcflags.push_str(" --test");
+ compiletest::run_tests(cfg);
+ if let Some(ref mut flags) = &mut cfg.target_rustcflags {
+ flags.truncate(len);
+ }
+}
+
+fn run_internal_tests(cfg: &mut compiletest::Config) {
+ // only run internal tests with the internal-tests feature
+ if !RUN_INTERNAL_TESTS {
+ return;
+ }
+ cfg.mode = TestMode::Ui;
+ cfg.src_base = Path::new("tests").join("ui-internal");
+ compiletest::run_tests(cfg);
+}
+
+fn run_ui_toml(config: &mut compiletest::Config) {
+ fn run_tests(config: &compiletest::Config, mut tests: Vec<tester::TestDescAndFn>) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+ let dir_path = dir.path();
+ let _g = VarGuard::set("CARGO_MANIFEST_DIR", &dir_path);
+ for file in fs::read_dir(&dir_path)? {
+ let file = file?;
+ let file_path = file.path();
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+ if file_path.extension() != Some(OsStr::new("rs")) {
+ continue;
+ }
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: dir_path.file_name().unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ Ok(result)
+ }
+
+ config.mode = TestMode::Ui;
+ config.src_base = Path::new("tests").join("ui-toml").canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(config);
+
+ let res = run_tests(config, tests);
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {:?}", e);
+ },
+ }
+}
+
+fn run_ui_cargo(config: &mut compiletest::Config) {
+ fn run_tests(
+ config: &compiletest::Config,
+ filters: &[String],
+ mut tests: Vec<tester::TestDescAndFn>,
+ ) -> Result<bool, io::Error> {
+ let mut result = true;
+ let opts = compiletest::test_opts(config);
+
+ for dir in fs::read_dir(&config.src_base)? {
+ let dir = dir?;
+ if !dir.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Use the filter if provided
+ let dir_path = dir.path();
+ for filter in filters {
+ if !dir_path.ends_with(filter) {
+ continue;
+ }
+ }
+
+ for case in fs::read_dir(&dir_path)? {
+ let case = case?;
+ if !case.file_type()?.is_dir() {
+ continue;
+ }
+
+ let src_path = case.path().join("src");
+
+ // When switching between branches, if the previous branch had a test
+ // that the current branch does not have, the directory is not removed
+ // because an ignored Cargo.lock file exists.
+ if !src_path.exists() {
+ continue;
+ }
+
+ env::set_current_dir(&src_path)?;
+ for file in fs::read_dir(&src_path)? {
+ let file = file?;
+ if file.file_type()?.is_dir() {
+ continue;
+ }
+
+ // Search for the main file to avoid running a test for each file in the project
+ let file_path = file.path();
+ match file_path.file_name().and_then(OsStr::to_str) {
+ Some("main.rs") => {},
+ _ => continue,
+ }
+ let _g = VarGuard::set("CLIPPY_CONF_DIR", case.path());
+ let paths = compiletest::common::TestPaths {
+ file: file_path,
+ base: config.src_base.clone(),
+ relative_dir: src_path.strip_prefix(&config.src_base).unwrap().into(),
+ };
+ let test_name = compiletest::make_test_name(config, &paths);
+ let index = tests
+ .iter()
+ .position(|test| test.desc.name == test_name)
+ .expect("The test should be in there");
+ result &= tester::run_tests_console(&opts, vec![tests.swap_remove(index)])?;
+ }
+ }
+ }
+ Ok(result)
+ }
+
+ if IS_RUSTC_TEST_SUITE {
+ return;
+ }
+
+ config.mode = TestMode::Ui;
+ config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap();
+
+ let tests = compiletest::make_tests(config);
+
+ let current_dir = env::current_dir().unwrap();
+ let res = run_tests(config, &config.filters, tests);
+ env::set_current_dir(current_dir).unwrap();
+
+ match res {
+ Ok(true) => {},
+ Ok(false) => panic!("Some tests failed"),
+ Err(e) => {
+ panic!("I/O failure during tests: {:?}", e);
+ },
+ }
+}
+
- prepare_env();
+#[test]
+fn compile_test() {
++ set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
+ let mut config = default_config();
+ run_ui(&mut config);
+ run_ui_test(&mut config);
+ run_ui_toml(&mut config);
+ run_ui_cargo(&mut config);
+ run_internal_tests(&mut config);
+}
+
+/// Restores an env var on drop
+#[must_use]
+struct VarGuard {
+ key: &'static str,
+ value: Option<OsString>,
+}
+
+impl VarGuard {
+ fn set(key: &'static str, val: impl AsRef<OsStr>) -> Self {
+ let value = var_os(key);
+ set_var(key, val);
+ Self { key, value }
+ }
+}
+
+impl Drop for VarGuard {
+ fn drop(&mut self) {
+ match self.value.as_deref() {
+ None => remove_var(self.key),
+ Some(value) => set_var(self.key, value),
+ }
+ }
+}
--- /dev/null
- #![allow(clippy::redundant_clone)]
- #![warn(clippy::manual_non_exhaustive)]
++#![allow(clippy::redundant_clone, clippy::unnecessary_operation)]
++#![warn(clippy::manual_non_exhaustive, clippy::borrow_as_ptr, clippy::manual_bits)]
+
++use std::mem::{size_of, size_of_val};
+use std::ops::Deref;
+
+mod enums {
+ enum E {
+ A,
+ B,
+ #[doc(hidden)]
+ _C,
+ }
+
+ // user forgot to remove the marker
+ #[non_exhaustive]
+ enum Ep {
+ A,
+ B,
+ #[doc(hidden)]
+ _C,
+ }
+}
+
+fn option_as_ref_deref() {
+ let mut opt = Some(String::from("123"));
+
+ let _ = opt.as_ref().map(String::as_str);
+ let _ = opt.as_ref().map(|x| x.as_str());
+ let _ = opt.as_mut().map(String::as_mut_str);
+ let _ = opt.as_mut().map(|x| x.as_mut_str());
+}
+
+fn match_like_matches() {
+ let _y = match Some(5) {
+ Some(0) => true,
+ _ => false,
+ };
+}
+
+fn match_same_arms() {
+ match (1, 2, 3) {
+ (1, .., 3) => 42,
+ (.., 3) => 42, //~ ERROR match arms have same body
+ _ => 0,
+ };
+}
+
+fn match_same_arms2() {
+ let _ = match Some(42) {
+ Some(_) => 24,
+ None => 24, //~ ERROR match arms have same body
+ };
+}
+
+fn manual_strip_msrv() {
+ let s = "hello, world!";
+ if s.starts_with("hello, ") {
+ assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
+ }
+}
+
+fn check_index_refutable_slice() {
+ // This shouldn't trigger `clippy::index_refutable_slice` as the suggestion
+ // would only be valid from 1.42.0 onward
+ let slice: Option<&[u32]> = Some(&[1]);
+ if let Some(slice) = slice {
+ println!("{}", slice[0]);
+ }
+}
+
++fn map_clone_suggest_copied() {
++ // This should still trigger the lint but suggest `cloned()` instead of `copied()`
++ let _: Option<u64> = Some(&16).map(|b| *b);
++}
++
++fn borrow_as_ptr() {
++ let val = 1;
++ let _p = &val as *const i32;
++
++ let mut val_mut = 1;
++ let _p_mut = &mut val_mut as *mut i32;
++}
++
++fn manual_bits() {
++ size_of::<i8>() * 8;
++ size_of_val(&0u32) * 8;
++}
++
+fn main() {
+ option_as_ref_deref();
+ match_like_matches();
+ match_same_arms();
+ match_same_arms2();
+ manual_strip_msrv();
+ check_index_refutable_slice();
++ borrow_as_ptr();
+}
--- /dev/null
--- /dev/null
++error: you are using an explicit closure for copying elements
++ --> $DIR/min_rust_version.rs:74:26
++ |
++LL | let _: Option<u64> = Some(&16).map(|b| *b);
++ | ^^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `cloned` method: `Some(&16).cloned()`
++ |
++ = note: `-D clippy::map-clone` implied by `-D warnings`
++
++error: aborting due to previous error
++
--- /dev/null
- #![allow(
- clippy::declare_interior_mutable_const,
- clippy::ref_in_deref,
- clippy::needless_borrow
- )]
+#![warn(clippy::borrow_interior_mutable_const)]
++#![allow(clippy::declare_interior_mutable_const, clippy::needless_borrow)]
+#![allow(const_item_mutation)]
+
+use std::borrow::Cow;
+use std::cell::{Cell, UnsafeCell};
+use std::fmt::Display;
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::sync::Once;
+
+const ATOMIC: AtomicUsize = AtomicUsize::new(5);
+const CELL: Cell<usize> = Cell::new(6);
+const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
+const INTEGER: u8 = 8;
+const STRING: String = String::new();
+const STR: &str = "012345";
+const COW: Cow<str> = Cow::Borrowed("abcdef");
+const NO_ANN: &dyn Display = &70;
+static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
+const ONCE_INIT: Once = Once::new();
+
+// This is just a pointer that can be safely dereferenced,
+// it's semantically the same as `&'static T`;
+// but it isn't allowed to make a static reference from an arbitrary integer value at the moment.
+// For more information, please see the issue #5918.
+pub struct StaticRef<T> {
+ ptr: *const T,
+}
+
+impl<T> StaticRef<T> {
+ /// Create a new `StaticRef` from a raw pointer
+ ///
+ /// ## Safety
+ ///
+ /// Callers must pass in a reference to statically allocated memory which
+ /// does not overlap with other values.
+ pub const unsafe fn new(ptr: *const T) -> StaticRef<T> {
+ StaticRef { ptr }
+ }
+}
+
+impl<T> std::ops::Deref for StaticRef<T> {
+ type Target = T;
+
+ fn deref(&self) -> &'static T {
+ unsafe { &*self.ptr }
+ }
+}
+
+// use a tuple to make sure referencing a field behind a pointer isn't linted.
+const CELL_REF: StaticRef<(UnsafeCell<u32>,)> = unsafe { StaticRef::new(std::ptr::null()) };
+
+fn main() {
+ ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
+ assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
+
+ let _once = ONCE_INIT;
+ let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
+ let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
+ let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
+ let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
+ let _atomic_into_inner = ATOMIC.into_inner();
+ // these should be all fine.
+ let _twice = (ONCE_INIT, ONCE_INIT);
+ let _ref_twice = &(ONCE_INIT, ONCE_INIT);
+ let _ref_once = &(ONCE_INIT, ONCE_INIT).0;
+ let _array_twice = [ONCE_INIT, ONCE_INIT];
+ let _ref_array_twice = &[ONCE_INIT, ONCE_INIT];
+ let _ref_array_once = &[ONCE_INIT, ONCE_INIT][0];
+
+ // referencing projection is still bad.
+ let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
+ let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
+ let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
+ let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
+ let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
+ let _ = &*ATOMIC_TUPLE.1;
+ let _ = &ATOMIC_TUPLE.2;
+ let _ = (&&&&ATOMIC_TUPLE).0;
+ let _ = (&&&&ATOMIC_TUPLE).2;
+ let _ = ATOMIC_TUPLE.0;
+ let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
+ let _ = ATOMIC_TUPLE.1.into_iter();
+ let _ = ATOMIC_TUPLE.2;
+ let _ = &{ ATOMIC_TUPLE };
+
+ CELL.set(2); //~ ERROR interior mutability
+ assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
+
+ assert_eq!(INTEGER, 8);
+ assert!(STRING.is_empty());
+
+ let a = ATOMIC;
+ a.store(4, Ordering::SeqCst);
+ assert_eq!(a.load(Ordering::SeqCst), 4);
+
+ STATIC_TUPLE.0.store(3, Ordering::SeqCst);
+ assert_eq!(STATIC_TUPLE.0.load(Ordering::SeqCst), 3);
+ assert!(STATIC_TUPLE.1.is_empty());
+
+ assert_eq!(NO_ANN.to_string(), "70"); // should never lint this.
+
+ let _ = &CELL_REF.0;
+}
--- /dev/null
- --> $DIR/others.rs:58:5
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:59:16
++ --> $DIR/others.rs:54:5
+ |
+LL | ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
+ | ^^^^^^
+ |
+ = note: `-D clippy::borrow-interior-mutable-const` implied by `-D warnings`
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:62:22
++ --> $DIR/others.rs:55:16
+ |
+LL | assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
+ | ^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:63:25
++ --> $DIR/others.rs:58:22
+ |
+LL | let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
+ | ^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:64:27
++ --> $DIR/others.rs:59:25
+ |
+LL | let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
+ | ^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:65:26
++ --> $DIR/others.rs:60:27
+ |
+LL | let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
+ | ^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:76:14
++ --> $DIR/others.rs:61:26
+ |
+LL | let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
+ | ^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:77:14
++ --> $DIR/others.rs:72:14
+ |
+LL | let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:78:19
++ --> $DIR/others.rs:73:14
+ |
+LL | let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:79:14
++ --> $DIR/others.rs:74:19
+ |
+LL | let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:80:13
++ --> $DIR/others.rs:75:14
+ |
+LL | let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:86:13
++ --> $DIR/others.rs:76:13
+ |
+LL | let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:91:5
++ --> $DIR/others.rs:82:13
+ |
+LL | let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
+ | ^^^^^^^^^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
- --> $DIR/others.rs:92:16
++ --> $DIR/others.rs:87:5
+ |
+LL | CELL.set(2); //~ ERROR interior mutability
+ | ^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: a `const` item with interior mutability should not be borrowed
++ --> $DIR/others.rs:88:16
+ |
+LL | assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
+ | ^^^^
+ |
+ = help: assign this const to a local or static variable, and use the variable here
+
+error: aborting due to 14 previous errors
+
--- /dev/null
++#![allow(clippy::needless_borrow)]
++
+#[deny(clippy::naive_bytecount)]
+fn main() {
+ let x = vec![0_u8; 16];
+
+ let _ = x.iter().filter(|&&a| a == 0).count(); // naive byte count
+
+ let _ = (&x[..]).iter().filter(|&a| *a == 0).count(); // naive byte count
+
+ let _ = x.iter().filter(|a| **a > 0).count(); // not an equality count, OK.
+
+ let _ = x.iter().map(|a| a + 1).filter(|&a| a < 15).count(); // not a slice
+
+ let b = 0;
+
+ let _ = x.iter().filter(|_| b > 0).count(); // woah there
+
+ let _ = x.iter().filter(|_a| b == b + 1).count(); // nothing to see here, move along
+
+ let _ = x.iter().filter(|a| b + 1 == **a).count(); // naive byte count
+
+ let y = vec![0_u16; 3];
+
+ let _ = y.iter().filter(|&&a| a == 0).count(); // naive count, but not bytes
+}
--- /dev/null
- --> $DIR/bytecount.rs:5:13
+error: you appear to be counting bytes the naive way
- --> $DIR/bytecount.rs:1:8
++ --> $DIR/bytecount.rs:7:13
+ |
+LL | let _ = x.iter().filter(|&&a| a == 0).count(); // naive byte count
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, 0)`
+ |
+note: the lint level is defined here
- --> $DIR/bytecount.rs:7:13
++ --> $DIR/bytecount.rs:3:8
+ |
+LL | #[deny(clippy::naive_bytecount)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: you appear to be counting bytes the naive way
- --> $DIR/bytecount.rs:19:13
++ --> $DIR/bytecount.rs:9:13
+ |
+LL | let _ = (&x[..]).iter().filter(|&a| *a == 0).count(); // naive byte count
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count((&x[..]), 0)`
+
+error: you appear to be counting bytes the naive way
++ --> $DIR/bytecount.rs:21:13
+ |
+LL | let _ = x.iter().filter(|a| b + 1 == **a).count(); // naive byte count
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, b + 1)`
+
+error: aborting due to 3 previous errors
+
--- /dev/null
- clippy::toplevel_ref_arg
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::redundant_clone,
+ clippy::deref_addrof,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::vec_init_then_push,
++ clippy::toplevel_ref_arg,
++ clippy::needless_borrow
+)]
+
+use std::cell::RefCell;
+use std::rc::{self, Rc};
+use std::sync::{self, Arc};
+
+fn main() {}
+
+fn is_ascii(ch: char) -> bool {
+ ch.is_ascii()
+}
+
+fn clone_on_copy() {
+ 42;
+
+ vec![1].clone(); // ok, not a Copy type
+ Some(vec![1]).clone(); // ok, not a Copy type
+ *(&42);
+
+ let rc = RefCell::new(0);
+ *rc.borrow();
+
+ let x = 0u32;
+ x.rotate_left(1);
+
+ #[derive(Clone, Copy)]
+ struct Foo;
+ impl Foo {
+ fn clone(&self) -> u32 {
+ 0
+ }
+ }
+ Foo.clone(); // ok, this is not the clone trait
+
+ macro_rules! m {
+ ($e:expr) => {{ $e }};
+ }
+ m!(42);
+
+ struct Wrap([u32; 2]);
+ impl core::ops::Deref for Wrap {
+ type Target = [u32; 2];
+ fn deref(&self) -> &[u32; 2] {
+ &self.0
+ }
+ }
+ let x = Wrap([0, 0]);
+ (*x)[0];
+
+ let x = 42;
+ let ref y = x.clone(); // ok, binds by reference
+ let ref mut y = x.clone(); // ok, binds by reference
+
+ // Issue #4348
+ let mut x = 43;
+ let _ = &x.clone(); // ok, getting a ref
+ 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate
+ is_ascii('z');
+
+ // Issue #5436
+ let mut vec = Vec::new();
+ vec.push(42);
+}
--- /dev/null
- clippy::toplevel_ref_arg
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::redundant_clone,
+ clippy::deref_addrof,
+ clippy::no_effect,
+ clippy::unnecessary_operation,
+ clippy::vec_init_then_push,
++ clippy::toplevel_ref_arg,
++ clippy::needless_borrow
+)]
+
+use std::cell::RefCell;
+use std::rc::{self, Rc};
+use std::sync::{self, Arc};
+
+fn main() {}
+
+fn is_ascii(ch: char) -> bool {
+ ch.is_ascii()
+}
+
+fn clone_on_copy() {
+ 42.clone();
+
+ vec![1].clone(); // ok, not a Copy type
+ Some(vec![1]).clone(); // ok, not a Copy type
+ (&42).clone();
+
+ let rc = RefCell::new(0);
+ rc.borrow().clone();
+
+ let x = 0u32;
+ x.clone().rotate_left(1);
+
+ #[derive(Clone, Copy)]
+ struct Foo;
+ impl Foo {
+ fn clone(&self) -> u32 {
+ 0
+ }
+ }
+ Foo.clone(); // ok, this is not the clone trait
+
+ macro_rules! m {
+ ($e:expr) => {{ $e }};
+ }
+ m!(42).clone();
+
+ struct Wrap([u32; 2]);
+ impl core::ops::Deref for Wrap {
+ type Target = [u32; 2];
+ fn deref(&self) -> &[u32; 2] {
+ &self.0
+ }
+ }
+ let x = Wrap([0, 0]);
+ x.clone()[0];
+
+ let x = 42;
+ let ref y = x.clone(); // ok, binds by reference
+ let ref mut y = x.clone(); // ok, binds by reference
+
+ // Issue #4348
+ let mut x = 43;
+ let _ = &x.clone(); // ok, getting a ref
+ 'a'.clone().make_ascii_uppercase(); // ok, clone and then mutate
+ is_ascii('z'.clone());
+
+ // Issue #5436
+ let mut vec = Vec::new();
+ vec.push(42.clone());
+}
--- /dev/null
- --> $DIR/clone_on_copy.rs:24:5
+error: using `clone` on type `i32` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:28:5
++ --> $DIR/clone_on_copy.rs:25:5
+ |
+LL | 42.clone();
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+ |
+ = note: `-D clippy::clone-on-copy` implied by `-D warnings`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:31:5
++ --> $DIR/clone_on_copy.rs:29:5
+ |
+LL | (&42).clone();
+ | ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:34:5
++ --> $DIR/clone_on_copy.rs:32:5
+ |
+LL | rc.borrow().clone();
+ | ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()`
+
+error: using `clone` on type `u32` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:48:5
++ --> $DIR/clone_on_copy.rs:35:5
+ |
+LL | x.clone().rotate_left(1);
+ | ^^^^^^^^^ help: try removing the `clone` call: `x`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:58:5
++ --> $DIR/clone_on_copy.rs:49:5
+ |
+LL | m!(42).clone();
+ | ^^^^^^^^^^^^^^ help: try removing the `clone` call: `m!(42)`
+
+error: using `clone` on type `[u32; 2]` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:68:14
++ --> $DIR/clone_on_copy.rs:59:5
+ |
+LL | x.clone()[0];
+ | ^^^^^^^^^ help: try dereferencing it: `(*x)`
+
+error: using `clone` on type `char` which implements the `Copy` trait
- --> $DIR/clone_on_copy.rs:72:14
++ --> $DIR/clone_on_copy.rs:69:14
+ |
+LL | is_ascii('z'.clone());
+ | ^^^^^^^^^^^ help: try removing the `clone` call: `'z'`
+
+error: using `clone` on type `i32` which implements the `Copy` trait
++ --> $DIR/clone_on_copy.rs:73:14
+ |
+LL | vec.push(42.clone());
+ | ^^^^^^^^^^ help: try removing the `clone` call: `42`
+
+error: aborting due to 8 previous errors
+
--- /dev/null
- #![allow(dead_code)]
+// run-rustfix
++#![allow(dead_code, clippy::needless_borrow)]
+#![warn(clippy::duration_subsec)]
+
+use std::time::Duration;
+
+fn main() {
+ let dur = Duration::new(5, 0);
+
+ let bad_millis_1 = dur.subsec_millis();
+ let bad_millis_2 = dur.subsec_millis();
+ let good_millis = dur.subsec_millis();
+ assert_eq!(bad_millis_1, good_millis);
+ assert_eq!(bad_millis_2, good_millis);
+
+ let bad_micros = dur.subsec_micros();
+ let good_micros = dur.subsec_micros();
+ assert_eq!(bad_micros, good_micros);
+
+ // Handle refs
+ let _ = (&dur).subsec_micros();
+
+ // Handle constants
+ const NANOS_IN_MICRO: u32 = 1_000;
+ let _ = dur.subsec_micros();
+
+ // Other literals aren't linted
+ let _ = dur.subsec_nanos() / 699;
+}
--- /dev/null
- #![allow(dead_code)]
+// run-rustfix
++#![allow(dead_code, clippy::needless_borrow)]
+#![warn(clippy::duration_subsec)]
+
+use std::time::Duration;
+
+fn main() {
+ let dur = Duration::new(5, 0);
+
+ let bad_millis_1 = dur.subsec_micros() / 1_000;
+ let bad_millis_2 = dur.subsec_nanos() / 1_000_000;
+ let good_millis = dur.subsec_millis();
+ assert_eq!(bad_millis_1, good_millis);
+ assert_eq!(bad_millis_2, good_millis);
+
+ let bad_micros = dur.subsec_nanos() / 1_000;
+ let good_micros = dur.subsec_micros();
+ assert_eq!(bad_micros, good_micros);
+
+ // Handle refs
+ let _ = (&dur).subsec_nanos() / 1_000;
+
+ // Handle constants
+ const NANOS_IN_MICRO: u32 = 1_000;
+ let _ = dur.subsec_nanos() / NANOS_IN_MICRO;
+
+ // Other literals aren't linted
+ let _ = dur.subsec_nanos() / 699;
+}
--- /dev/null
+#![warn(clippy::enum_variant_names)]
+#![allow(non_camel_case_types, clippy::upper_case_acronyms)]
+
+enum FakeCallType {
+ CALL,
+ CREATE,
+}
+
+enum FakeCallType2 {
+ CALL,
+ CREATELL,
+}
+
+enum Foo {
+ cFoo,
+ cBar,
+ cBaz,
+}
+
+enum Fooo {
+ cFoo, // no error, threshold is 3 variants by default
+ cBar,
+}
+
+enum Food {
+ FoodGood,
+ FoodMiddle,
+ FoodBad,
+}
+
+enum Stuff {
+ StuffBad, // no error
+}
+
+enum BadCallType {
+ CallTypeCall,
+ CallTypeCreate,
+ CallTypeDestroy,
+}
+
+enum TwoCallType {
+ // no error
+ CallTypeCall,
+ CallTypeCreate,
+}
+
+enum Consts {
+ ConstantInt,
+ ConstantCake,
+ ConstantLie,
+}
+
+enum Two {
+ // no error here
+ ConstantInt,
+ ConstantInfer,
+}
+
+enum Something {
+ CCall,
+ CCreate,
+ CCryogenize,
+}
+
+enum Seal {
+ With,
+ Without,
+}
+
+enum Seall {
+ With,
+ WithOut,
+ Withbroken,
+}
+
+enum Sealll {
+ With,
+ WithOut,
+}
+
+enum Seallll {
+ WithOutCake,
+ WithOutTea,
+ WithOut,
+}
+
+enum NonCaps {
+ Prefix的,
+ PrefixTea,
+ PrefixCake,
+}
+
+pub enum PubSeall {
+ WithOutCake,
+ WithOutTea,
+ WithOut,
+}
+
+#[allow(clippy::enum_variant_names)]
+pub mod allowed {
+ pub enum PubAllowed {
+ SomeThis,
+ SomeThat,
+ SomeOtherWhat,
+ }
+}
+
+// should not lint
+enum Pat {
+ Foo,
+ Bar,
+ Path,
+}
+
+// should not lint
+enum N {
+ Pos,
+ Neg,
+ Float,
+}
+
+// should not lint
+enum Peek {
+ Peek1,
+ Peek2,
+ Peek3,
+}
+
+// should not lint
+pub enum NetworkLayer {
+ Layer2,
+ Layer3,
+}
+
+// should lint suggesting `IData`, not only `Data` (see #4639)
+enum IDataRequest {
+ PutIData(String),
+ GetIData(String),
+ DeleteUnpubIData(String),
+}
+
+enum HIDataRequest {
+ PutHIData(String),
+ GetHIData(String),
+ DeleteUnpubHIData(String),
+}
+
+enum North {
+ Normal,
+ NoLeft,
+ NoRight,
+}
+
++// #8324
++enum Phase {
++ PreLookup,
++ Lookup,
++ PostLookup,
++}
++
+fn main() {}
--- /dev/null
- clippy::option_map_unit_fn
- )]
- #![warn(
- clippy::redundant_closure,
- clippy::redundant_closure_for_method_calls,
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::no_effect,
+ clippy::redundant_closure_call,
+ clippy::needless_pass_by_value,
- all(&[1, 2, 3], &2, below); //is adjusted
++ clippy::option_map_unit_fn,
+ clippy::needless_borrow
+)]
++#![warn(clippy::redundant_closure, clippy::redundant_closure_for_method_calls)]
+
+use std::path::{Path, PathBuf};
+
+macro_rules! mac {
+ () => {
+ foobar()
+ };
+}
+
+macro_rules! closure_mac {
+ () => {
+ |n| foo(n)
+ };
+}
+
+fn main() {
+ let a = Some(1u8).map(foo);
+ let c = Some(1u8).map(|a| {1+2; foo}(a));
+ true.then(|| mac!()); // don't lint function in macro expansion
+ Some(1).map(closure_mac!()); // don't lint closure in macro expansion
+ let _: Option<Vec<u8>> = true.then(std::vec::Vec::new); // special case vec!
+ let d = Some(1u8).map(|a| foo(foo2(a))); //is adjusted?
++ all(&[1, 2, 3], &&2, below); //is adjusted
+ unsafe {
+ Some(1u8).map(|a| unsafe_fn(a)); // unsafe fn
+ }
+
+ // See #815
+ let e = Some(1u8).map(divergent);
+ let e = Some(1u8).map(generic);
+ let e = Some(1u8).map(generic);
+ // See #515
+ let a: Option<Box<dyn (::std::ops::Deref<Target = [i32]>)>> =
+ Some(vec![1i32, 2]).map(|v| -> Box<dyn (::std::ops::Deref<Target = [i32]>)> { Box::new(v) });
+
+ // issue #7224
+ let _: Option<Vec<u32>> = Some(0).map(|_| vec![]);
+}
+
+trait TestTrait {
+ fn trait_foo(self) -> bool;
+ fn trait_foo_ref(&self) -> bool;
+}
+
+struct TestStruct<'a> {
+ some_ref: &'a i32,
+}
+
+impl<'a> TestStruct<'a> {
+ fn foo(self) -> bool {
+ false
+ }
+ unsafe fn foo_unsafe(self) -> bool {
+ true
+ }
+}
+
+impl<'a> TestTrait for TestStruct<'a> {
+ fn trait_foo(self) -> bool {
+ false
+ }
+ fn trait_foo_ref(&self) -> bool {
+ false
+ }
+}
+
+impl<'a> std::ops::Deref for TestStruct<'a> {
+ type Target = char;
+ fn deref(&self) -> &char {
+ &'a'
+ }
+}
+
+fn test_redundant_closures_containing_method_calls() {
+ let i = 10;
+ let e = Some(TestStruct { some_ref: &i }).map(TestStruct::foo);
+ let e = Some(TestStruct { some_ref: &i }).map(TestTrait::trait_foo);
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo_ref());
+ let e = Some(&mut vec![1, 2, 3]).map(std::vec::Vec::clear);
+ unsafe {
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo_unsafe());
+ }
+ let e = Some("str").map(std::string::ToString::to_string);
+ let e = Some('a').map(char::to_uppercase);
+ let e: std::vec::Vec<usize> = vec!['a', 'b', 'c'].iter().map(|c| c.len_utf8()).collect();
+ let e: std::vec::Vec<char> = vec!['a', 'b', 'c'].iter().map(char::to_ascii_uppercase).collect();
+ let e = Some(PathBuf::new()).as_ref().and_then(|s| s.to_str());
+ let c = Some(TestStruct { some_ref: &i })
+ .as_ref()
+ .map(|c| c.to_ascii_uppercase());
+
+ fn test_different_borrow_levels<T>(t: &[&T])
+ where
+ T: TestTrait,
+ {
+ t.iter().filter(|x| x.trait_foo_ref());
+ t.iter().map(|x| x.trait_foo_ref());
+ }
+}
+
+struct Thunk<T>(Box<dyn FnMut() -> T>);
+
+impl<T> Thunk<T> {
+ fn new<F: 'static + FnOnce() -> T>(f: F) -> Thunk<T> {
+ let mut option = Some(f);
+ // This should not trigger redundant_closure (#1439)
+ Thunk(Box::new(move || option.take().unwrap()()))
+ }
+
+ fn unwrap(self) -> T {
+ let Thunk(mut f) = self;
+ f()
+ }
+}
+
+fn foobar() {
+ let thunk = Thunk::new(|| println!("Hello, world!"));
+ thunk.unwrap()
+}
+
+fn foo(_: u8) {}
+
+fn foo2(_: u8) -> u8 {
+ 1u8
+}
+
+fn all<X, F>(x: &[X], y: &X, f: F) -> bool
+where
+ F: Fn(&X, &X) -> bool,
+{
+ x.iter().all(|e| f(e, y))
+}
+
+fn below(x: &u8, y: &u8) -> bool {
+ x < y
+}
+
+unsafe fn unsafe_fn(_: u8) {}
+
+fn divergent(_: u8) -> ! {
+ unimplemented!()
+}
+
+fn generic<T>(_: T) -> u8 {
+ 0
+}
+
+fn passes_fn_mut(mut x: Box<dyn FnMut()>) {
+ requires_fn_once(x);
+}
+fn requires_fn_once<T: FnOnce()>(_: T) {}
+
+fn test_redundant_closure_with_function_pointer() {
+ type FnPtrType = fn(u8);
+ let foo_ptr: FnPtrType = foo;
+ let a = Some(1u8).map(foo_ptr);
+}
+
+fn test_redundant_closure_with_another_closure() {
+ let closure = |a| println!("{}", a);
+ let a = Some(1u8).map(closure);
+}
+
+fn make_lazy(f: impl Fn() -> fn(u8) -> u8) -> impl Fn(u8) -> u8 {
+ // Currently f is called when result of make_lazy is called.
+ // If the closure is removed, f will be called when make_lazy itself is
+ // called. This changes semantics, so the closure must stay.
+ Box::new(move |x| f()(x))
+}
+
+fn call<F: FnOnce(&mut String) -> String>(f: F) -> String {
+ f(&mut "Hello".to_owned())
+}
+fn test_difference_in_mutability() {
+ call(|s| s.clone());
+}
+
+struct Bar;
+impl std::ops::Deref for Bar {
+ type Target = str;
+ fn deref(&self) -> &str {
+ "hi"
+ }
+}
+
+fn test_deref_with_trait_method() {
+ let _ = [Bar].iter().map(|s| s.to_string()).collect::<Vec<_>>();
+}
+
+fn mutable_closure_used_again(x: Vec<i32>, y: Vec<i32>, z: Vec<i32>) {
+ let mut res = Vec::new();
+ let mut add_to_res = |n| res.push(n);
+ x.into_iter().for_each(&mut add_to_res);
+ y.into_iter().for_each(&mut add_to_res);
+ z.into_iter().for_each(add_to_res);
+}
+
+fn mutable_closure_in_loop() {
+ let mut value = 0;
+ let mut closure = |n| value += n;
+ for _ in 0..5 {
+ Some(1).map(&mut closure);
+ }
+}
+
+fn late_bound_lifetimes() {
+ fn take_asref_path<P: AsRef<Path>>(path: P) {}
+
+ fn map_str<F>(thunk: F)
+ where
+ F: FnOnce(&str),
+ {
+ }
+
+ fn map_str_to_path<F>(thunk: F)
+ where
+ F: FnOnce(&str) -> &Path,
+ {
+ }
+ map_str(|s| take_asref_path(s));
+ map_str_to_path(std::convert::AsRef::as_ref);
+}
+
+mod type_param_bound {
+ trait Trait {
+ fn fun();
+ }
+
+ fn take<T: 'static>(_: T) {}
+
+ fn test<X: Trait>() {
+ // don't lint, but it's questionable that rust requires a cast
+ take(|| X::fun());
+ take(X::fun as fn());
+ }
+}
+
+// #8073 Don't replace closure with `Arc<F>` or `Rc<F>`
+fn arc_fp() {
+ let rc = std::rc::Rc::new(|| 7);
+ let arc = std::sync::Arc::new(|n| n + 1);
+ let ref_arc = &std::sync::Arc::new(|_| 5);
+
+ true.then(|| rc());
+ (0..5).map(|n| arc(n));
+ Some(4).map(|n| ref_arc(n));
+}
--- /dev/null
- clippy::option_map_unit_fn
- )]
- #![warn(
- clippy::redundant_closure,
- clippy::redundant_closure_for_method_calls,
+// run-rustfix
+
+#![allow(
+ unused,
+ clippy::no_effect,
+ clippy::redundant_closure_call,
+ clippy::needless_pass_by_value,
++ clippy::option_map_unit_fn,
+ clippy::needless_borrow
+)]
++#![warn(clippy::redundant_closure, clippy::redundant_closure_for_method_calls)]
+
+use std::path::{Path, PathBuf};
+
+macro_rules! mac {
+ () => {
+ foobar()
+ };
+}
+
+macro_rules! closure_mac {
+ () => {
+ |n| foo(n)
+ };
+}
+
+fn main() {
+ let a = Some(1u8).map(|a| foo(a));
+ let c = Some(1u8).map(|a| {1+2; foo}(a));
+ true.then(|| mac!()); // don't lint function in macro expansion
+ Some(1).map(closure_mac!()); // don't lint closure in macro expansion
+ let _: Option<Vec<u8>> = true.then(|| vec![]); // special case vec!
+ let d = Some(1u8).map(|a| foo((|b| foo2(b))(a))); //is adjusted?
+ all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
+ unsafe {
+ Some(1u8).map(|a| unsafe_fn(a)); // unsafe fn
+ }
+
+ // See #815
+ let e = Some(1u8).map(|a| divergent(a));
+ let e = Some(1u8).map(|a| generic(a));
+ let e = Some(1u8).map(generic);
+ // See #515
+ let a: Option<Box<dyn (::std::ops::Deref<Target = [i32]>)>> =
+ Some(vec![1i32, 2]).map(|v| -> Box<dyn (::std::ops::Deref<Target = [i32]>)> { Box::new(v) });
+
+ // issue #7224
+ let _: Option<Vec<u32>> = Some(0).map(|_| vec![]);
+}
+
+trait TestTrait {
+ fn trait_foo(self) -> bool;
+ fn trait_foo_ref(&self) -> bool;
+}
+
+struct TestStruct<'a> {
+ some_ref: &'a i32,
+}
+
+impl<'a> TestStruct<'a> {
+ fn foo(self) -> bool {
+ false
+ }
+ unsafe fn foo_unsafe(self) -> bool {
+ true
+ }
+}
+
+impl<'a> TestTrait for TestStruct<'a> {
+ fn trait_foo(self) -> bool {
+ false
+ }
+ fn trait_foo_ref(&self) -> bool {
+ false
+ }
+}
+
+impl<'a> std::ops::Deref for TestStruct<'a> {
+ type Target = char;
+ fn deref(&self) -> &char {
+ &'a'
+ }
+}
+
+fn test_redundant_closures_containing_method_calls() {
+ let i = 10;
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo());
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo());
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo_ref());
+ let e = Some(&mut vec![1, 2, 3]).map(|v| v.clear());
+ unsafe {
+ let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo_unsafe());
+ }
+ let e = Some("str").map(|s| s.to_string());
+ let e = Some('a').map(|s| s.to_uppercase());
+ let e: std::vec::Vec<usize> = vec!['a', 'b', 'c'].iter().map(|c| c.len_utf8()).collect();
+ let e: std::vec::Vec<char> = vec!['a', 'b', 'c'].iter().map(|c| c.to_ascii_uppercase()).collect();
+ let e = Some(PathBuf::new()).as_ref().and_then(|s| s.to_str());
+ let c = Some(TestStruct { some_ref: &i })
+ .as_ref()
+ .map(|c| c.to_ascii_uppercase());
+
+ fn test_different_borrow_levels<T>(t: &[&T])
+ where
+ T: TestTrait,
+ {
+ t.iter().filter(|x| x.trait_foo_ref());
+ t.iter().map(|x| x.trait_foo_ref());
+ }
+}
+
+struct Thunk<T>(Box<dyn FnMut() -> T>);
+
+impl<T> Thunk<T> {
+ fn new<F: 'static + FnOnce() -> T>(f: F) -> Thunk<T> {
+ let mut option = Some(f);
+ // This should not trigger redundant_closure (#1439)
+ Thunk(Box::new(move || option.take().unwrap()()))
+ }
+
+ fn unwrap(self) -> T {
+ let Thunk(mut f) = self;
+ f()
+ }
+}
+
+fn foobar() {
+ let thunk = Thunk::new(|| println!("Hello, world!"));
+ thunk.unwrap()
+}
+
+fn foo(_: u8) {}
+
+fn foo2(_: u8) -> u8 {
+ 1u8
+}
+
+fn all<X, F>(x: &[X], y: &X, f: F) -> bool
+where
+ F: Fn(&X, &X) -> bool,
+{
+ x.iter().all(|e| f(e, y))
+}
+
+fn below(x: &u8, y: &u8) -> bool {
+ x < y
+}
+
+unsafe fn unsafe_fn(_: u8) {}
+
+fn divergent(_: u8) -> ! {
+ unimplemented!()
+}
+
+fn generic<T>(_: T) -> u8 {
+ 0
+}
+
+fn passes_fn_mut(mut x: Box<dyn FnMut()>) {
+ requires_fn_once(|| x());
+}
+fn requires_fn_once<T: FnOnce()>(_: T) {}
+
+fn test_redundant_closure_with_function_pointer() {
+ type FnPtrType = fn(u8);
+ let foo_ptr: FnPtrType = foo;
+ let a = Some(1u8).map(|a| foo_ptr(a));
+}
+
+fn test_redundant_closure_with_another_closure() {
+ let closure = |a| println!("{}", a);
+ let a = Some(1u8).map(|a| closure(a));
+}
+
+fn make_lazy(f: impl Fn() -> fn(u8) -> u8) -> impl Fn(u8) -> u8 {
+ // Currently f is called when result of make_lazy is called.
+ // If the closure is removed, f will be called when make_lazy itself is
+ // called. This changes semantics, so the closure must stay.
+ Box::new(move |x| f()(x))
+}
+
+fn call<F: FnOnce(&mut String) -> String>(f: F) -> String {
+ f(&mut "Hello".to_owned())
+}
+fn test_difference_in_mutability() {
+ call(|s| s.clone());
+}
+
+struct Bar;
+impl std::ops::Deref for Bar {
+ type Target = str;
+ fn deref(&self) -> &str {
+ "hi"
+ }
+}
+
+fn test_deref_with_trait_method() {
+ let _ = [Bar].iter().map(|s| s.to_string()).collect::<Vec<_>>();
+}
+
+fn mutable_closure_used_again(x: Vec<i32>, y: Vec<i32>, z: Vec<i32>) {
+ let mut res = Vec::new();
+ let mut add_to_res = |n| res.push(n);
+ x.into_iter().for_each(|x| add_to_res(x));
+ y.into_iter().for_each(|x| add_to_res(x));
+ z.into_iter().for_each(|x| add_to_res(x));
+}
+
+fn mutable_closure_in_loop() {
+ let mut value = 0;
+ let mut closure = |n| value += n;
+ for _ in 0..5 {
+ Some(1).map(|n| closure(n));
+ }
+}
+
+fn late_bound_lifetimes() {
+ fn take_asref_path<P: AsRef<Path>>(path: P) {}
+
+ fn map_str<F>(thunk: F)
+ where
+ F: FnOnce(&str),
+ {
+ }
+
+ fn map_str_to_path<F>(thunk: F)
+ where
+ F: FnOnce(&str) -> &Path,
+ {
+ }
+ map_str(|s| take_asref_path(s));
+ map_str_to_path(|s| s.as_ref());
+}
+
+mod type_param_bound {
+ trait Trait {
+ fn fun();
+ }
+
+ fn take<T: 'static>(_: T) {}
+
+ fn test<X: Trait>() {
+ // don't lint, but it's questionable that rust requires a cast
+ take(|| X::fun());
+ take(X::fun as fn());
+ }
+}
+
+// #8073 Don't replace closure with `Arc<F>` or `Rc<F>`
+fn arc_fp() {
+ let rc = std::rc::Rc::new(|| 7);
+ let arc = std::sync::Arc::new(|n| n + 1);
+ let ref_arc = &std::sync::Arc::new(|_| 5);
+
+ true.then(|| rc());
+ (0..5).map(|n| arc(n));
+ Some(4).map(|n| ref_arc(n));
+}
--- /dev/null
- --> $DIR/eta.rs:31:27
+error: redundant closure
- --> $DIR/eta.rs:35:40
++ --> $DIR/eta.rs:28:27
+ |
+LL | let a = Some(1u8).map(|a| foo(a));
+ | ^^^^^^^^^^ help: replace the closure with the function itself: `foo`
+ |
+ = note: `-D clippy::redundant-closure` implied by `-D warnings`
+
+error: redundant closure
- --> $DIR/eta.rs:36:35
++ --> $DIR/eta.rs:32:40
+ |
+LL | let _: Option<Vec<u8>> = true.then(|| vec![]); // special case vec!
+ | ^^^^^^^^^ help: replace the closure with `Vec::new`: `std::vec::Vec::new`
+
+error: redundant closure
- error: this expression borrows a reference (`&u8`) that is immediately dereferenced by the compiler
- --> $DIR/eta.rs:37:21
- |
- LL | all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
- | ^^^ help: change this to: `&2`
- |
- = note: `-D clippy::needless-borrow` implied by `-D warnings`
-
++ --> $DIR/eta.rs:33:35
+ |
+LL | let d = Some(1u8).map(|a| foo((|b| foo2(b))(a))); //is adjusted?
+ | ^^^^^^^^^^^^^ help: replace the closure with the function itself: `foo2`
+
- --> $DIR/eta.rs:37:26
+error: redundant closure
- --> $DIR/eta.rs:43:27
++ --> $DIR/eta.rs:34:26
+ |
+LL | all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
+ | ^^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `below`
+
+error: redundant closure
- --> $DIR/eta.rs:44:27
++ --> $DIR/eta.rs:40:27
+ |
+LL | let e = Some(1u8).map(|a| divergent(a));
+ | ^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `divergent`
+
+error: redundant closure
- --> $DIR/eta.rs:90:51
++ --> $DIR/eta.rs:41:27
+ |
+LL | let e = Some(1u8).map(|a| generic(a));
+ | ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `generic`
+
+error: redundant closure
- --> $DIR/eta.rs:91:51
++ --> $DIR/eta.rs:87:51
+ |
+LL | let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo());
+ | ^^^^^^^^^^^ help: replace the closure with the method itself: `TestStruct::foo`
+ |
+ = note: `-D clippy::redundant-closure-for-method-calls` implied by `-D warnings`
+
+error: redundant closure
- --> $DIR/eta.rs:93:42
++ --> $DIR/eta.rs:88:51
+ |
+LL | let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo());
+ | ^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `TestTrait::trait_foo`
+
+error: redundant closure
- --> $DIR/eta.rs:97:29
++ --> $DIR/eta.rs:90:42
+ |
+LL | let e = Some(&mut vec![1, 2, 3]).map(|v| v.clear());
+ | ^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::vec::Vec::clear`
+
+error: redundant closure
- --> $DIR/eta.rs:98:27
++ --> $DIR/eta.rs:94:29
+ |
+LL | let e = Some("str").map(|s| s.to_string());
+ | ^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::string::ToString::to_string`
+
+error: redundant closure
- --> $DIR/eta.rs:100:65
++ --> $DIR/eta.rs:95:27
+ |
+LL | let e = Some('a').map(|s| s.to_uppercase());
+ | ^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `char::to_uppercase`
+
+error: redundant closure
- --> $DIR/eta.rs:163:22
++ --> $DIR/eta.rs:97:65
+ |
+LL | let e: std::vec::Vec<char> = vec!['a', 'b', 'c'].iter().map(|c| c.to_ascii_uppercase()).collect();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `char::to_ascii_uppercase`
+
+error: redundant closure
- --> $DIR/eta.rs:170:27
++ --> $DIR/eta.rs:160:22
+ |
+LL | requires_fn_once(|| x());
+ | ^^^^^^ help: replace the closure with the function itself: `x`
+
+error: redundant closure
- --> $DIR/eta.rs:175:27
++ --> $DIR/eta.rs:167:27
+ |
+LL | let a = Some(1u8).map(|a| foo_ptr(a));
+ | ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `foo_ptr`
+
+error: redundant closure
- --> $DIR/eta.rs:207:28
++ --> $DIR/eta.rs:172:27
+ |
+LL | let a = Some(1u8).map(|a| closure(a));
+ | ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `closure`
+
+error: redundant closure
- --> $DIR/eta.rs:208:28
++ --> $DIR/eta.rs:204:28
+ |
+LL | x.into_iter().for_each(|x| add_to_res(x));
+ | ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut add_to_res`
+
+error: redundant closure
- --> $DIR/eta.rs:209:28
++ --> $DIR/eta.rs:205:28
+ |
+LL | y.into_iter().for_each(|x| add_to_res(x));
+ | ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut add_to_res`
+
+error: redundant closure
- --> $DIR/eta.rs:216:21
++ --> $DIR/eta.rs:206:28
+ |
+LL | z.into_iter().for_each(|x| add_to_res(x));
+ | ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `add_to_res`
+
+error: redundant closure
- --> $DIR/eta.rs:235:21
++ --> $DIR/eta.rs:213:21
+ |
+LL | Some(1).map(|n| closure(n));
+ | ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut closure`
+
+error: redundant closure
- error: aborting due to 21 previous errors
++ --> $DIR/eta.rs:232:21
+ |
+LL | map_str_to_path(|s| s.as_ref());
+ | ^^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::convert::AsRef::as_ref`
+
++error: aborting due to 20 previous errors
+
--- /dev/null
- #![allow(unused_variables, clippy::clone_double_ref)]
+// run-rustfix
+
++#![allow(unused_variables, clippy::clone_double_ref, clippy::needless_borrow)]
+#![warn(clippy::explicit_deref_methods)]
+
+use std::ops::{Deref, DerefMut};
+
+fn concat(deref_str: &str) -> String {
+ format!("{}bar", deref_str)
+}
+
+fn just_return(deref_str: &str) -> &str {
+ deref_str
+}
+
+struct CustomVec(Vec<u8>);
+impl Deref for CustomVec {
+ type Target = Vec<u8>;
+
+ fn deref(&self) -> &Vec<u8> {
+ &self.0
+ }
+}
+
+fn main() {
+ let a: &mut String = &mut String::from("foo");
+
+ // these should require linting
+
+ let b: &str = &*a;
+
+ let b: &mut str = &mut **a;
+
+ // both derefs should get linted here
+ let b: String = format!("{}, {}", &*a, &*a);
+
+ println!("{}", &*a);
+
+ #[allow(clippy::match_single_binding)]
+ match &*a {
+ _ => (),
+ }
+
+ let b: String = concat(&*a);
+
+ let b = just_return(a);
+
+ let b: String = concat(just_return(a));
+
+ let b: &str = &**a;
+
+ let opt_a = Some(a.clone());
+ let b = &*opt_a.unwrap();
+
+ // following should not require linting
+
+ let cv = CustomVec(vec![0, 42]);
+ let c = cv.deref()[0];
+
+ let b: &str = &*a.deref();
+
+ let b: String = a.deref().clone();
+
+ let b: usize = a.deref_mut().len();
+
+ let b: &usize = &a.deref().len();
+
+ let b: &str = &*a;
+
+ let b: &mut str = &mut *a;
+
+ macro_rules! expr_deref {
+ ($body:expr) => {
+ $body.deref()
+ };
+ }
+ let b: &str = expr_deref!(a);
+
+ let b: &str = expr_deref!(&*a);
+
+ // The struct does not implement Deref trait
+ #[derive(Copy, Clone)]
+ struct NoLint(u32);
+ impl NoLint {
+ pub fn deref(self) -> u32 {
+ self.0
+ }
+ pub fn deref_mut(self) -> u32 {
+ self.0
+ }
+ }
+ let no_lint = NoLint(42);
+ let b = no_lint.deref();
+ let b = no_lint.deref_mut();
+}
--- /dev/null
- #![allow(unused_variables, clippy::clone_double_ref)]
+// run-rustfix
+
++#![allow(unused_variables, clippy::clone_double_ref, clippy::needless_borrow)]
+#![warn(clippy::explicit_deref_methods)]
+
+use std::ops::{Deref, DerefMut};
+
+fn concat(deref_str: &str) -> String {
+ format!("{}bar", deref_str)
+}
+
+fn just_return(deref_str: &str) -> &str {
+ deref_str
+}
+
+struct CustomVec(Vec<u8>);
+impl Deref for CustomVec {
+ type Target = Vec<u8>;
+
+ fn deref(&self) -> &Vec<u8> {
+ &self.0
+ }
+}
+
+fn main() {
+ let a: &mut String = &mut String::from("foo");
+
+ // these should require linting
+
+ let b: &str = a.deref();
+
+ let b: &mut str = a.deref_mut();
+
+ // both derefs should get linted here
+ let b: String = format!("{}, {}", a.deref(), a.deref());
+
+ println!("{}", a.deref());
+
+ #[allow(clippy::match_single_binding)]
+ match a.deref() {
+ _ => (),
+ }
+
+ let b: String = concat(a.deref());
+
+ let b = just_return(a).deref();
+
+ let b: String = concat(just_return(a).deref());
+
+ let b: &str = a.deref().deref();
+
+ let opt_a = Some(a.clone());
+ let b = opt_a.unwrap().deref();
+
+ // following should not require linting
+
+ let cv = CustomVec(vec![0, 42]);
+ let c = cv.deref()[0];
+
+ let b: &str = &*a.deref();
+
+ let b: String = a.deref().clone();
+
+ let b: usize = a.deref_mut().len();
+
+ let b: &usize = &a.deref().len();
+
+ let b: &str = &*a;
+
+ let b: &mut str = &mut *a;
+
+ macro_rules! expr_deref {
+ ($body:expr) => {
+ $body.deref()
+ };
+ }
+ let b: &str = expr_deref!(a);
+
+ let b: &str = expr_deref!(a.deref());
+
+ // The struct does not implement Deref trait
+ #[derive(Copy, Clone)]
+ struct NoLint(u32);
+ impl NoLint {
+ pub fn deref(self) -> u32 {
+ self.0
+ }
+ pub fn deref_mut(self) -> u32 {
+ self.0
+ }
+ }
+ let no_lint = NoLint(42);
+ let b = no_lint.deref();
+ let b = no_lint.deref_mut();
+}
--- /dev/null
- #[allow(clippy::linkedlist, clippy::unnecessary_mut_passed, clippy::similar_names)]
+// run-rustfix
+
+#![allow(dead_code, unused)]
+
+use std::collections::*;
+
+#[warn(clippy::all)]
+struct Unrelated(Vec<u8>);
+impl Unrelated {
+ fn next(&self) -> std::slice::Iter<u8> {
+ self.0.iter()
+ }
+
+ fn iter(&self) -> std::slice::Iter<u8> {
+ self.0.iter()
+ }
+}
+
+#[warn(
+ clippy::needless_range_loop,
+ clippy::explicit_iter_loop,
+ clippy::explicit_into_iter_loop,
+ clippy::iter_next_loop,
+ clippy::for_kv_map
+)]
++#[allow(
++ clippy::linkedlist,
++ clippy::unnecessary_mut_passed,
++ clippy::similar_names,
++ clippy::needless_borrow
++)]
+#[allow(unused_variables)]
+fn main() {
+ let mut vec = vec![1, 2, 3, 4];
+
+ // See #601
+ for i in 0..10 {
+ // no error, id_col does not exist outside the loop
+ let mut id_col = vec![0f64; 10];
+ id_col[i] = 1f64;
+ }
+
+ for _v in &vec {}
+
+ for _v in &mut vec {}
+
+ let out_vec = vec![1, 2, 3];
+ for _v in out_vec {}
+
+ for _v in &vec {} // these are fine
+ for _v in &mut vec {} // these are fine
+
+ for _v in &[1, 2, 3] {}
+
+ for _v in (&mut [1, 2, 3]).iter() {} // no error
+
+ for _v in &[0; 32] {}
+
+ for _v in [0; 33].iter() {} // no error
+
+ let ll: LinkedList<()> = LinkedList::new();
+ for _v in &ll {}
+
+ let vd: VecDeque<()> = VecDeque::new();
+ for _v in &vd {}
+
+ let bh: BinaryHeap<()> = BinaryHeap::new();
+ for _v in &bh {}
+
+ let hm: HashMap<(), ()> = HashMap::new();
+ for _v in &hm {}
+
+ let bt: BTreeMap<(), ()> = BTreeMap::new();
+ for _v in &bt {}
+
+ let hs: HashSet<()> = HashSet::new();
+ for _v in &hs {}
+
+ let bs: BTreeSet<()> = BTreeSet::new();
+ for _v in &bs {}
+
+ let u = Unrelated(vec![]);
+ for _v in u.next() {} // no error
+ for _v in u.iter() {} // no error
+
+ let mut out = vec![];
+ vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
+ let _y = vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>(); // this is fine
+
+ // Loop with explicit counter variable
+
+ // Potential false positives
+ let mut _index = 0;
+ _index = 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ _index += 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ if true {
+ _index = 1
+ }
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ let mut _index = 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index += 1;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index *= 2;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index = 1;
+ _index += 1
+ }
+
+ let mut _index = 0;
+
+ for _v in &vec {
+ let mut _index = 0;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index += 1;
+ _index = 0;
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ for _x in 0..1 {
+ _index += 1;
+ }
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for x in &vec {
+ if *x == 1 {
+ _index += 1
+ }
+ }
+
+ let mut _index = 0;
+ if true {
+ _index = 1
+ };
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 1;
+ if false {
+ _index = 0
+ };
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut index = 0;
+ {
+ let mut _x = &mut index;
+ }
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut index = 0;
+ for _v in &vec {
+ index += 1
+ }
+ println!("index: {}", index);
+
+ fn f<T>(_: &T, _: &T) -> bool {
+ unimplemented!()
+ }
+ fn g<T>(_: &mut [T], _: usize, _: usize) {
+ unimplemented!()
+ }
+ for i in 1..vec.len() {
+ if f(&vec[i - 1], &vec[i]) {
+ g(&mut vec, i - 1, i);
+ }
+ }
+
+ for mid in 1..vec.len() {
+ let (_, _) = vec.split_at(mid);
+ }
+}
+
+fn partition<T: PartialOrd + Send>(v: &mut [T]) -> usize {
+ let pivot = v.len() - 1;
+ let mut i = 0;
+ for j in 0..pivot {
+ if v[j] <= v[pivot] {
+ v.swap(i, j);
+ i += 1;
+ }
+ }
+ v.swap(i, pivot);
+ i
+}
+
+#[warn(clippy::needless_range_loop)]
+pub fn manual_copy_same_destination(dst: &mut [i32], d: usize, s: usize) {
+ // Same source and destination - don't trigger lint
+ for i in 0..dst.len() {
+ dst[d + i] = dst[s + i];
+ }
+}
+
+mod issue_2496 {
+ pub trait Handle {
+ fn new_for_index(index: usize) -> Self;
+ fn index(&self) -> usize;
+ }
+
+ pub fn test<H: Handle>() -> H {
+ for x in 0..5 {
+ let next_handle = H::new_for_index(x);
+ println!("{}", next_handle.index());
+ }
+ unimplemented!()
+ }
+}
+
+// explicit_into_iter_loop bad suggestions
+#[warn(clippy::explicit_into_iter_loop, clippy::explicit_iter_loop)]
+mod issue_4958 {
+ fn takes_iterator<T>(iterator: &T)
+ where
+ for<'a> &'a T: IntoIterator<Item = &'a String>,
+ {
+ for i in iterator {
+ println!("{}", i);
+ }
+ }
+
+ struct T;
+ impl IntoIterator for &T {
+ type Item = ();
+ type IntoIter = std::vec::IntoIter<Self::Item>;
+ fn into_iter(self) -> Self::IntoIter {
+ vec![].into_iter()
+ }
+ }
+
+ fn more_tests() {
+ let t = T;
+ let r = &t;
+ let rr = &&t;
+
+ // This case is handled by `explicit_iter_loop`. No idea why.
+ for _ in &t {}
+
+ for _ in r {}
+
+ // No suggestion for this.
+ // We'd have to suggest `for _ in *rr {}` which is less clear.
+ for _ in rr.into_iter() {}
+ }
+}
+
+// explicit_into_iter_loop
+#[warn(clippy::explicit_into_iter_loop)]
+mod issue_6900 {
+ struct S;
+ impl S {
+ #[allow(clippy::should_implement_trait)]
+ pub fn into_iter<T>(self) -> I<T> {
+ unimplemented!()
+ }
+ }
+
+ struct I<T>(T);
+ impl<T> Iterator for I<T> {
+ type Item = T;
+ fn next(&mut self) -> Option<Self::Item> {
+ unimplemented!()
+ }
+ }
+
+ fn f() {
+ for _ in S.into_iter::<u32>() {
+ unimplemented!()
+ }
+ }
+}
--- /dev/null
- #[allow(clippy::linkedlist, clippy::unnecessary_mut_passed, clippy::similar_names)]
+// run-rustfix
+
+#![allow(dead_code, unused)]
+
+use std::collections::*;
+
+#[warn(clippy::all)]
+struct Unrelated(Vec<u8>);
+impl Unrelated {
+ fn next(&self) -> std::slice::Iter<u8> {
+ self.0.iter()
+ }
+
+ fn iter(&self) -> std::slice::Iter<u8> {
+ self.0.iter()
+ }
+}
+
+#[warn(
+ clippy::needless_range_loop,
+ clippy::explicit_iter_loop,
+ clippy::explicit_into_iter_loop,
+ clippy::iter_next_loop,
+ clippy::for_kv_map
+)]
++#[allow(
++ clippy::linkedlist,
++ clippy::unnecessary_mut_passed,
++ clippy::similar_names,
++ clippy::needless_borrow
++)]
+#[allow(unused_variables)]
+fn main() {
+ let mut vec = vec![1, 2, 3, 4];
+
+ // See #601
+ for i in 0..10 {
+ // no error, id_col does not exist outside the loop
+ let mut id_col = vec![0f64; 10];
+ id_col[i] = 1f64;
+ }
+
+ for _v in vec.iter() {}
+
+ for _v in vec.iter_mut() {}
+
+ let out_vec = vec![1, 2, 3];
+ for _v in out_vec.into_iter() {}
+
+ for _v in &vec {} // these are fine
+ for _v in &mut vec {} // these are fine
+
+ for _v in [1, 2, 3].iter() {}
+
+ for _v in (&mut [1, 2, 3]).iter() {} // no error
+
+ for _v in [0; 32].iter() {}
+
+ for _v in [0; 33].iter() {} // no error
+
+ let ll: LinkedList<()> = LinkedList::new();
+ for _v in ll.iter() {}
+
+ let vd: VecDeque<()> = VecDeque::new();
+ for _v in vd.iter() {}
+
+ let bh: BinaryHeap<()> = BinaryHeap::new();
+ for _v in bh.iter() {}
+
+ let hm: HashMap<(), ()> = HashMap::new();
+ for _v in hm.iter() {}
+
+ let bt: BTreeMap<(), ()> = BTreeMap::new();
+ for _v in bt.iter() {}
+
+ let hs: HashSet<()> = HashSet::new();
+ for _v in hs.iter() {}
+
+ let bs: BTreeSet<()> = BTreeSet::new();
+ for _v in bs.iter() {}
+
+ let u = Unrelated(vec![]);
+ for _v in u.next() {} // no error
+ for _v in u.iter() {} // no error
+
+ let mut out = vec![];
+ vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>();
+ let _y = vec.iter().cloned().map(|x| out.push(x)).collect::<Vec<_>>(); // this is fine
+
+ // Loop with explicit counter variable
+
+ // Potential false positives
+ let mut _index = 0;
+ _index = 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ _index += 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ if true {
+ _index = 1
+ }
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ let mut _index = 1;
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index += 1;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index *= 2;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index = 1;
+ _index += 1
+ }
+
+ let mut _index = 0;
+
+ for _v in &vec {
+ let mut _index = 0;
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ _index += 1;
+ _index = 0;
+ }
+
+ let mut _index = 0;
+ for _v in &vec {
+ for _x in 0..1 {
+ _index += 1;
+ }
+ _index += 1
+ }
+
+ let mut _index = 0;
+ for x in &vec {
+ if *x == 1 {
+ _index += 1
+ }
+ }
+
+ let mut _index = 0;
+ if true {
+ _index = 1
+ };
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut _index = 1;
+ if false {
+ _index = 0
+ };
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut index = 0;
+ {
+ let mut _x = &mut index;
+ }
+ for _v in &vec {
+ _index += 1
+ }
+
+ let mut index = 0;
+ for _v in &vec {
+ index += 1
+ }
+ println!("index: {}", index);
+
+ fn f<T>(_: &T, _: &T) -> bool {
+ unimplemented!()
+ }
+ fn g<T>(_: &mut [T], _: usize, _: usize) {
+ unimplemented!()
+ }
+ for i in 1..vec.len() {
+ if f(&vec[i - 1], &vec[i]) {
+ g(&mut vec, i - 1, i);
+ }
+ }
+
+ for mid in 1..vec.len() {
+ let (_, _) = vec.split_at(mid);
+ }
+}
+
+fn partition<T: PartialOrd + Send>(v: &mut [T]) -> usize {
+ let pivot = v.len() - 1;
+ let mut i = 0;
+ for j in 0..pivot {
+ if v[j] <= v[pivot] {
+ v.swap(i, j);
+ i += 1;
+ }
+ }
+ v.swap(i, pivot);
+ i
+}
+
+#[warn(clippy::needless_range_loop)]
+pub fn manual_copy_same_destination(dst: &mut [i32], d: usize, s: usize) {
+ // Same source and destination - don't trigger lint
+ for i in 0..dst.len() {
+ dst[d + i] = dst[s + i];
+ }
+}
+
+mod issue_2496 {
+ pub trait Handle {
+ fn new_for_index(index: usize) -> Self;
+ fn index(&self) -> usize;
+ }
+
+ pub fn test<H: Handle>() -> H {
+ for x in 0..5 {
+ let next_handle = H::new_for_index(x);
+ println!("{}", next_handle.index());
+ }
+ unimplemented!()
+ }
+}
+
+// explicit_into_iter_loop bad suggestions
+#[warn(clippy::explicit_into_iter_loop, clippy::explicit_iter_loop)]
+mod issue_4958 {
+ fn takes_iterator<T>(iterator: &T)
+ where
+ for<'a> &'a T: IntoIterator<Item = &'a String>,
+ {
+ for i in iterator.into_iter() {
+ println!("{}", i);
+ }
+ }
+
+ struct T;
+ impl IntoIterator for &T {
+ type Item = ();
+ type IntoIter = std::vec::IntoIter<Self::Item>;
+ fn into_iter(self) -> Self::IntoIter {
+ vec![].into_iter()
+ }
+ }
+
+ fn more_tests() {
+ let t = T;
+ let r = &t;
+ let rr = &&t;
+
+ // This case is handled by `explicit_iter_loop`. No idea why.
+ for _ in t.into_iter() {}
+
+ for _ in r.into_iter() {}
+
+ // No suggestion for this.
+ // We'd have to suggest `for _ in *rr {}` which is less clear.
+ for _ in rr.into_iter() {}
+ }
+}
+
+// explicit_into_iter_loop
+#[warn(clippy::explicit_into_iter_loop)]
+mod issue_6900 {
+ struct S;
+ impl S {
+ #[allow(clippy::should_implement_trait)]
+ pub fn into_iter<T>(self) -> I<T> {
+ unimplemented!()
+ }
+ }
+
+ struct I<T>(T);
+ impl<T> Iterator for I<T> {
+ type Item = T;
+ fn next(&mut self) -> Option<Self::Item> {
+ unimplemented!()
+ }
+ }
+
+ fn f() {
+ for _ in S.into_iter::<u32>() {
+ unimplemented!()
+ }
+ }
+}
--- /dev/null
- --> $DIR/for_loop_fixable.rs:38:15
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:40:15
++ --> $DIR/for_loop_fixable.rs:43:15
+ |
+LL | for _v in vec.iter() {}
+ | ^^^^^^^^^^ help: to write this more concisely, try: `&vec`
+ |
+ = note: `-D clippy::explicit-iter-loop` implied by `-D warnings`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:43:15
++ --> $DIR/for_loop_fixable.rs:45:15
+ |
+LL | for _v in vec.iter_mut() {}
+ | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec`
+
+error: it is more concise to loop over containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:48:15
++ --> $DIR/for_loop_fixable.rs:48:15
+ |
+LL | for _v in out_vec.into_iter() {}
+ | ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec`
+ |
+ = note: `-D clippy::explicit-into-iter-loop` implied by `-D warnings`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:52:15
++ --> $DIR/for_loop_fixable.rs:53:15
+ |
+LL | for _v in [1, 2, 3].iter() {}
+ | ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:57:15
++ --> $DIR/for_loop_fixable.rs:57:15
+ |
+LL | for _v in [0; 32].iter() {}
+ | ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:60:15
++ --> $DIR/for_loop_fixable.rs:62:15
+ |
+LL | for _v in ll.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&ll`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:63:15
++ --> $DIR/for_loop_fixable.rs:65:15
+ |
+LL | for _v in vd.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&vd`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:66:15
++ --> $DIR/for_loop_fixable.rs:68:15
+ |
+LL | for _v in bh.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bh`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:69:15
++ --> $DIR/for_loop_fixable.rs:71:15
+ |
+LL | for _v in hm.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&hm`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:72:15
++ --> $DIR/for_loop_fixable.rs:74:15
+ |
+LL | for _v in bt.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bt`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:75:15
++ --> $DIR/for_loop_fixable.rs:77:15
+ |
+LL | for _v in hs.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&hs`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:250:18
++ --> $DIR/for_loop_fixable.rs:80:15
+ |
+LL | for _v in bs.iter() {}
+ | ^^^^^^^^^ help: to write this more concisely, try: `&bs`
+
+error: it is more concise to loop over containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:270:18
++ --> $DIR/for_loop_fixable.rs:255:18
+ |
+LL | for i in iterator.into_iter() {
+ | ^^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `iterator`
+
+error: it is more concise to loop over references to containers instead of using explicit iteration methods
- --> $DIR/for_loop_fixable.rs:272:18
++ --> $DIR/for_loop_fixable.rs:275:18
+ |
+LL | for _ in t.into_iter() {}
+ | ^^^^^^^^^^^^^ help: to write this more concisely, try: `&t`
+
+error: it is more concise to loop over containers instead of using explicit iteration methods
++ --> $DIR/for_loop_fixable.rs:277:18
+ |
+LL | for _ in r.into_iter() {}
+ | ^^^^^^^^^^^^^ help: to write this more concisely, try: `r`
+
+error: aborting due to 15 previous errors
+
--- /dev/null
- #![allow(clippy::print_literal, clippy::redundant_clone, clippy::to_string_in_format_args)]
+// run-rustfix
+
++#![allow(
++ clippy::print_literal,
++ clippy::redundant_clone,
++ clippy::to_string_in_format_args,
++ clippy::needless_borrow
++)]
+#![warn(clippy::useless_format)]
+
+struct Foo(pub String);
+
+macro_rules! foo {
+ ($($t:tt)*) => (Foo(format!($($t)*)))
+}
+
+fn main() {
+ "foo".to_string();
+ "{}".to_string();
+ "{} abc {}".to_string();
+ r##"foo {}
+" bar"##.to_string();
+
+ let _ = String::new();
+
+ "foo".to_string();
+ format!("{:?}", "foo"); // Don't warn about `Debug`.
+ format!("{:8}", "foo");
+ format!("{:width$}", "foo", width = 8);
+ "foo".to_string(); // Warn when the format makes no difference.
+ "foo".to_string(); // Warn when the format makes no difference.
+ format!("foo {}", "bar");
+ format!("{} bar", "foo");
+
+ let arg: String = "".to_owned();
+ arg.to_string();
+ format!("{:?}", arg); // Don't warn about debug.
+ format!("{:8}", arg);
+ format!("{:width$}", arg, width = 8);
+ arg.to_string(); // Warn when the format makes no difference.
+ arg.to_string(); // Warn when the format makes no difference.
+ format!("foo {}", arg);
+ format!("{} bar", arg);
+
+ // We don’t want to warn for non-string args; see issue #697.
+ format!("{}", 42);
+ format!("{:?}", 42);
+ format!("{:+}", 42);
+ format!("foo {}", 42);
+ format!("{} bar", 42);
+
+ // We only want to warn about `format!` itself.
+ println!("foo");
+ println!("{}", "foo");
+ println!("foo {}", "foo");
+ println!("{}", 42);
+ println!("foo {}", 42);
+
+ // A `format!` inside a macro should not trigger a warning.
+ foo!("should not warn");
+
+ // Precision on string means slicing without panicking on size.
+ format!("{:.1}", "foo"); // Could be `"foo"[..1]`
+ format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
+ format!("{:.prec$}", "foo", prec = 1);
+ format!("{:.prec$}", "foo", prec = 10);
+
+ 42.to_string();
+ let x = std::path::PathBuf::from("/bar/foo/qux");
+ x.display().to_string();
+
+ // False positive
+ let a = "foo".to_string();
+ let _ = Some(a + "bar");
+
+ // Wrap it with braces
+ let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
+ let _s: String = (&*v.join("\n")).to_string();
+
+ format!("prepend {:+}", "s");
+
+ // Issue #8290
+ let x = "foo";
+ let _ = x.to_string();
+ let _ = format!("{x:?}"); // Don't lint on debug
+ let _ = x.to_string();
+}
--- /dev/null
- #![allow(clippy::print_literal, clippy::redundant_clone, clippy::to_string_in_format_args)]
+// run-rustfix
+
++#![allow(
++ clippy::print_literal,
++ clippy::redundant_clone,
++ clippy::to_string_in_format_args,
++ clippy::needless_borrow
++)]
+#![warn(clippy::useless_format)]
+
+struct Foo(pub String);
+
+macro_rules! foo {
+ ($($t:tt)*) => (Foo(format!($($t)*)))
+}
+
+fn main() {
+ format!("foo");
+ format!("{{}}");
+ format!("{{}} abc {{}}");
+ format!(
+ r##"foo {{}}
+" bar"##
+ );
+
+ let _ = format!("");
+
+ format!("{}", "foo");
+ format!("{:?}", "foo"); // Don't warn about `Debug`.
+ format!("{:8}", "foo");
+ format!("{:width$}", "foo", width = 8);
+ format!("{:+}", "foo"); // Warn when the format makes no difference.
+ format!("{:<}", "foo"); // Warn when the format makes no difference.
+ format!("foo {}", "bar");
+ format!("{} bar", "foo");
+
+ let arg: String = "".to_owned();
+ format!("{}", arg);
+ format!("{:?}", arg); // Don't warn about debug.
+ format!("{:8}", arg);
+ format!("{:width$}", arg, width = 8);
+ format!("{:+}", arg); // Warn when the format makes no difference.
+ format!("{:<}", arg); // Warn when the format makes no difference.
+ format!("foo {}", arg);
+ format!("{} bar", arg);
+
+ // We don’t want to warn for non-string args; see issue #697.
+ format!("{}", 42);
+ format!("{:?}", 42);
+ format!("{:+}", 42);
+ format!("foo {}", 42);
+ format!("{} bar", 42);
+
+ // We only want to warn about `format!` itself.
+ println!("foo");
+ println!("{}", "foo");
+ println!("foo {}", "foo");
+ println!("{}", 42);
+ println!("foo {}", 42);
+
+ // A `format!` inside a macro should not trigger a warning.
+ foo!("should not warn");
+
+ // Precision on string means slicing without panicking on size.
+ format!("{:.1}", "foo"); // Could be `"foo"[..1]`
+ format!("{:.10}", "foo"); // Could not be `"foo"[..10]`
+ format!("{:.prec$}", "foo", prec = 1);
+ format!("{:.prec$}", "foo", prec = 10);
+
+ format!("{}", 42.to_string());
+ let x = std::path::PathBuf::from("/bar/foo/qux");
+ format!("{}", x.display().to_string());
+
+ // False positive
+ let a = "foo".to_string();
+ let _ = Some(format!("{}", a + "bar"));
+
+ // Wrap it with braces
+ let v: Vec<String> = vec!["foo".to_string(), "bar".to_string()];
+ let _s: String = format!("{}", &*v.join("\n"));
+
+ format!("prepend {:+}", "s");
+
+ // Issue #8290
+ let x = "foo";
+ let _ = format!("{x}");
+ let _ = format!("{x:?}"); // Don't lint on debug
+ let _ = format!("{y}", y = x);
+}
--- /dev/null
- --> $DIR/format.rs:13:5
+error: useless use of `format!`
- --> $DIR/format.rs:14:5
++ --> $DIR/format.rs:18:5
+ |
+LL | format!("foo");
+ | ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+ |
+ = note: `-D clippy::useless-format` implied by `-D warnings`
+
+error: useless use of `format!`
- --> $DIR/format.rs:15:5
++ --> $DIR/format.rs:19:5
+ |
+LL | format!("{{}}");
+ | ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{}".to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:16:5
++ --> $DIR/format.rs:20:5
+ |
+LL | format!("{{}} abc {{}}");
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{} abc {}".to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:21:13
++ --> $DIR/format.rs:21:5
+ |
+LL | / format!(
+LL | | r##"foo {{}}
+LL | | " bar"##
+LL | | );
+ | |_____^
+ |
+help: consider using `.to_string()`
+ |
+LL ~ r##"foo {}
+LL ~ " bar"##.to_string();
+ |
+
+error: useless use of `format!`
- --> $DIR/format.rs:23:5
++ --> $DIR/format.rs:26:13
+ |
+LL | let _ = format!("");
+ | ^^^^^^^^^^^ help: consider using `String::new()`: `String::new()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:27:5
++ --> $DIR/format.rs:28:5
+ |
+LL | format!("{}", "foo");
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:28:5
++ --> $DIR/format.rs:32:5
+ |
+LL | format!("{:+}", "foo"); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:33:5
++ --> $DIR/format.rs:33:5
+ |
+LL | format!("{:<}", "foo"); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:37:5
++ --> $DIR/format.rs:38:5
+ |
+LL | format!("{}", arg);
+ | ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:38:5
++ --> $DIR/format.rs:42:5
+ |
+LL | format!("{:+}", arg); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:65:5
++ --> $DIR/format.rs:43:5
+ |
+LL | format!("{:<}", arg); // Warn when the format makes no difference.
+ | ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:67:5
++ --> $DIR/format.rs:70:5
+ |
+LL | format!("{}", 42.to_string());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `42.to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:71:18
++ --> $DIR/format.rs:72:5
+ |
+LL | format!("{}", x.display().to_string());
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.display().to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:75:22
++ --> $DIR/format.rs:76:18
+ |
+LL | let _ = Some(format!("{}", a + "bar"));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`
+
+error: useless use of `format!`
- --> $DIR/format.rs:81:13
++ --> $DIR/format.rs:80:22
+ |
+LL | let _s: String = format!("{}", &*v.join("/n"));
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `(&*v.join("/n")).to_string()`
+
+error: useless use of `format!`
- --> $DIR/format.rs:83:13
++ --> $DIR/format.rs:86:13
+ |
+LL | let _ = format!("{x}");
+ | ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
+
+error: useless use of `format!`
++ --> $DIR/format.rs:88:13
+ |
+LL | let _ = format!("{y}", y = x);
+ | ^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
+
+error: aborting due to 17 previous errors
+
--- /dev/null
+// run-rustfix
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables, clippy::unnecessary_mut_passed)]
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &a
+ },
+ 46 => &a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&a);
+ let _ = x(&a);
+ let _ = x(&mut b);
+ let _ = x(ref_a);
+ {
+ let b = &mut b;
+ x(b);
+ }
++
++ // Issue #8191
++ let mut x = 5;
++ let mut x = &mut x;
++
++ mut_ref(x);
++ mut_ref(x);
++ let y: &mut i32 = x;
++ let y: &mut i32 = x;
++
++ let y = match 0 {
++ // Don't lint. Removing the borrow would move 'x'
++ 0 => &mut x,
++ _ => &mut *x,
++ };
++
++ *x = 5;
++
++ let s = String::new();
++ let _ = s.len();
++ let _ = s.capacity();
++ let _ = s.capacity();
++
++ let x = (1, 2);
++ let _ = x.0;
++ let x = &x as *const (i32, i32);
++ let _ = unsafe { (*x).0 };
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
--- /dev/null
+// run-rustfix
+
+#[warn(clippy::all, clippy::needless_borrow)]
+#[allow(unused_variables, clippy::unnecessary_mut_passed)]
+fn main() {
+ let a = 5;
+ let ref_a = &a;
+ let _ = x(&a); // no warning
+ let _ = x(&&a); // warn
+
+ let mut b = 5;
+ mut_ref(&mut b); // no warning
+ mut_ref(&mut &mut b); // warn
+
+ let s = &String::from("hi");
+ let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
+ let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
+ let vec = Vec::new();
+ let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
+ h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
+ let garbl = match 42 {
+ 44 => &a,
+ 45 => {
+ println!("foo");
+ &&a
+ },
+ 46 => &&a,
+ 47 => {
+ println!("foo");
+ loop {
+ println!("{}", a);
+ if a == 25 {
+ break &ref_a;
+ }
+ }
+ },
+ _ => panic!(),
+ };
+
+ let _ = x(&&&a);
+ let _ = x(&mut &&a);
+ let _ = x(&&&mut b);
+ let _ = x(&&ref_a);
+ {
+ let b = &mut b;
+ x(&b);
+ }
++
++ // Issue #8191
++ let mut x = 5;
++ let mut x = &mut x;
++
++ mut_ref(&mut x);
++ mut_ref(&mut &mut x);
++ let y: &mut i32 = &mut x;
++ let y: &mut i32 = &mut &mut x;
++
++ let y = match 0 {
++ // Don't lint. Removing the borrow would move 'x'
++ 0 => &mut x,
++ _ => &mut *x,
++ };
++
++ *x = 5;
++
++ let s = String::new();
++ let _ = (&s).len();
++ let _ = (&s).capacity();
++ let _ = (&&s).capacity();
++
++ let x = (1, 2);
++ let _ = (&x).0;
++ let x = &x as *const (i32, i32);
++ let _ = unsafe { (&*x).0 };
+}
+
+#[allow(clippy::needless_borrowed_reference)]
+fn x(y: &i32) -> i32 {
+ *y
+}
+
+fn mut_ref(y: &mut i32) {
+ *y = 5;
+}
+
+fn f<T: Copy>(y: &T) -> T {
+ *y
+}
+
+fn g(y: &[u8]) -> u8 {
+ y[0]
+}
+
+trait Trait {}
+
+impl<'a> Trait for &'a str {}
+
+fn h(_: &dyn Trait) {}
--- /dev/null
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:9:15
+ |
+LL | let _ = x(&&a); // warn
+ | ^^^ help: change this to: `&a`
+ |
+ = note: `-D clippy::needless-borrow` implied by `-D warnings`
+
- error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:13:13
+ |
+LL | mut_ref(&mut &mut b); // warn
+ | ^^^^^^^^^^^ help: change this to: `&mut b`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:25:13
+ |
+LL | &&a
+ | ^^^ help: change this to: `&a`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:27:15
+ |
+LL | 46 => &&a,
+ | ^^^ help: change this to: `&a`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:33:27
+ |
+LL | break &ref_a;
+ | ^^^^^^ help: change this to: `ref_a`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:40:15
+ |
+LL | let _ = x(&&&a);
+ | ^^^^ help: change this to: `&a`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:41:15
+ |
+LL | let _ = x(&mut &&a);
+ | ^^^^^^^^ help: change this to: `&a`
+
- error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:42:15
+ |
+LL | let _ = x(&&&mut b);
+ | ^^^^^^^^ help: change this to: `&mut b`
+
- error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:43:15
+ |
+LL | let _ = x(&&ref_a);
+ | ^^^^^^^ help: change this to: `ref_a`
+
- error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
++error: this expression creates a reference which is immediately dereferenced by the compiler
+ --> $DIR/needless_borrow.rs:46:11
+ |
+LL | x(&b);
+ | ^^ help: change this to: `b`
+
- error: aborting due to 10 previous errors
++error: this expression creates a reference which is immediately dereferenced by the compiler
++ --> $DIR/needless_borrow.rs:53:13
++ |
++LL | mut_ref(&mut x);
++ | ^^^^^^ help: change this to: `x`
++
++error: this expression creates a reference which is immediately dereferenced by the compiler
++ --> $DIR/needless_borrow.rs:54:13
++ |
++LL | mut_ref(&mut &mut x);
++ | ^^^^^^^^^^^ help: change this to: `x`
++
++error: this expression creates a reference which is immediately dereferenced by the compiler
++ --> $DIR/needless_borrow.rs:55:23
++ |
++LL | let y: &mut i32 = &mut x;
++ | ^^^^^^ help: change this to: `x`
++
++error: this expression creates a reference which is immediately dereferenced by the compiler
++ --> $DIR/needless_borrow.rs:56:23
++ |
++LL | let y: &mut i32 = &mut &mut x;
++ | ^^^^^^^^^^^ help: change this to: `x`
++
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:67:13
++ |
++LL | let _ = (&s).len();
++ | ^^^^ help: change this to: `s`
++
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:68:13
++ |
++LL | let _ = (&s).capacity();
++ | ^^^^ help: change this to: `s`
++
++error: this expression creates a reference which is immediately dereferenced by the compiler
++ --> $DIR/needless_borrow.rs:69:13
++ |
++LL | let _ = (&&s).capacity();
++ | ^^^^^ help: change this to: `s`
++
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:72:13
++ |
++LL | let _ = (&x).0;
++ | ^^^^ help: change this to: `x`
++
++error: this expression borrows a value the compiler would automatically borrow
++ --> $DIR/needless_borrow.rs:74:22
++ |
++LL | let _ = unsafe { (&*x).0 };
++ | ^^^^^ help: change this to: `(*x)`
++
++error: aborting due to 19 previous errors
+
--- /dev/null
- #![allow(dead_code, clippy::needless_pass_by_value, clippy::unnecessary_wraps, dyn_drop)]
+#![warn(clippy::needless_lifetimes)]
++#![allow(
++ dead_code,
++ clippy::boxed_local,
++ clippy::needless_pass_by_value,
++ clippy::unnecessary_wraps,
++ dyn_drop
++)]
+
+fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
+
+fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) {}
+
+// No error; same lifetime on two params.
+fn same_lifetime_on_input<'a>(_x: &'a u8, _y: &'a u8) {}
+
+// No error; static involved.
+fn only_static_on_input(_x: &u8, _y: &u8, _z: &'static u8) {}
+
+fn mut_and_static_input(_x: &mut u8, _y: &'static str) {}
+
+fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 {
+ x
+}
+
+// No error; multiple input refs.
+fn multiple_in_and_out_1<'a>(x: &'a u8, _y: &'a u8) -> &'a u8 {
+ x
+}
+
+// No error; multiple input refs.
+fn multiple_in_and_out_2<'a, 'b>(x: &'a u8, _y: &'b u8) -> &'a u8 {
+ x
+}
+
+// No error; multiple input refs
+async fn func<'a>(args: &[&'a str]) -> Option<&'a str> {
+ args.get(0).cloned()
+}
+
+// No error; static involved.
+fn in_static_and_out<'a>(x: &'a u8, _y: &'static u8) -> &'a u8 {
+ x
+}
+
+// No error.
+fn deep_reference_1<'a, 'b>(x: &'a u8, _y: &'b u8) -> Result<&'a u8, ()> {
+ Ok(x)
+}
+
+// No error; two input refs.
+fn deep_reference_2<'a>(x: Result<&'a u8, &'a u8>) -> &'a u8 {
+ x.unwrap()
+}
+
+fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> {
+ Ok(x)
+}
+
+// Where-clause, but without lifetimes.
+fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()>
+where
+ T: Copy,
+{
+ Ok(x)
+}
+
+type Ref<'r> = &'r u8;
+
+// No error; same lifetime on two params.
+fn lifetime_param_1<'a>(_x: Ref<'a>, _y: &'a u8) {}
+
+fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) {}
+
+// No error; bounded lifetime.
+fn lifetime_param_3<'a, 'b: 'a>(_x: Ref<'a>, _y: &'b u8) {}
+
+// No error; bounded lifetime.
+fn lifetime_param_4<'a, 'b>(_x: Ref<'a>, _y: &'b u8)
+where
+ 'b: 'a,
+{
+}
+
+struct Lt<'a, I: 'static> {
+ x: &'a I,
+}
+
+// No error; fn bound references `'a`.
+fn fn_bound<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
+where
+ F: Fn(Lt<'a, I>) -> Lt<'a, I>,
+{
+ unreachable!()
+}
+
+fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
+where
+ for<'x> F: Fn(Lt<'x, I>) -> Lt<'x, I>,
+{
+ unreachable!()
+}
+
+// No error; see below.
+fn fn_bound_3<'a, F: FnOnce(&'a i32)>(x: &'a i32, f: F) {
+ f(x);
+}
+
+fn fn_bound_3_cannot_elide() {
+ let x = 42;
+ let p = &x;
+ let mut q = &x;
+ // This will fail if we elide lifetimes of `fn_bound_3`.
+ fn_bound_3(p, |y| q = y);
+}
+
+// No error; multiple input refs.
+fn fn_bound_4<'a, F: FnOnce() -> &'a ()>(cond: bool, x: &'a (), f: F) -> &'a () {
+ if cond { x } else { f() }
+}
+
+struct X {
+ x: u8,
+}
+
+impl X {
+ fn self_and_out<'s>(&'s self) -> &'s u8 {
+ &self.x
+ }
+
+ // No error; multiple input refs.
+ fn self_and_in_out<'s, 't>(&'s self, _x: &'t u8) -> &'s u8 {
+ &self.x
+ }
+
+ fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) {}
+
+ // No error; same lifetimes on two params.
+ fn self_and_same_in<'s>(&'s self, _x: &'s u8) {}
+}
+
+struct Foo<'a>(&'a u8);
+
+impl<'a> Foo<'a> {
+ // No error; lifetime `'a` not defined in method.
+ fn self_shared_lifetime(&self, _: &'a u8) {}
+ // No error; bounds exist.
+ fn self_bound_lifetime<'b: 'a>(&self, _: &'b u8) {}
+}
+
+fn already_elided<'a>(_: &u8, _: &'a u8) -> &'a u8 {
+ unimplemented!()
+}
+
+fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes (named on the reference, anonymous on `Foo`).
+fn struct_with_lt2<'a>(_foo: &'a Foo) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes (anonymous on the reference, named on `Foo`).
+fn struct_with_lt3<'a>(_foo: &Foo<'a>) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes.
+fn struct_with_lt4<'a, 'b>(_foo: &'a Foo<'b>) -> &'a str {
+ unimplemented!()
+}
+
+trait WithLifetime<'a> {}
+
+type WithLifetimeAlias<'a> = dyn WithLifetime<'a>;
+
+// Should not warn because it won't build without the lifetime.
+fn trait_obj_elided<'a>(_arg: &'a dyn WithLifetime) -> &'a str {
+ unimplemented!()
+}
+
+// Should warn because there is no lifetime on `Drop`, so this would be
+// unambiguous if we elided the lifetime.
+fn trait_obj_elided2<'a>(_arg: &'a dyn Drop) -> &'a str {
+ unimplemented!()
+}
+
+type FooAlias<'a> = Foo<'a>;
+
+fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes (named on the reference, anonymous on `FooAlias`).
+fn alias_with_lt2<'a>(_foo: &'a FooAlias) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes (anonymous on the reference, named on `FooAlias`).
+fn alias_with_lt3<'a>(_foo: &FooAlias<'a>) -> &'a str {
+ unimplemented!()
+}
+
+// No warning; two input lifetimes.
+fn alias_with_lt4<'a, 'b>(_foo: &'a FooAlias<'b>) -> &'a str {
+ unimplemented!()
+}
+
+fn named_input_elided_output<'a>(_arg: &'a str) -> &str {
+ unimplemented!()
+}
+
+fn elided_input_named_output<'a>(_arg: &str) -> &'a str {
+ unimplemented!()
+}
+
+fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) {
+ unimplemented!()
+}
+fn trait_bound<'a, T: WithLifetime<'a>>(_: &'a u8, _: T) {
+ unimplemented!()
+}
+
+// Don't warn on these; see issue #292.
+fn trait_bound_bug<'a, T: WithLifetime<'a>>() {
+ unimplemented!()
+}
+
+// See issue #740.
+struct Test {
+ vec: Vec<usize>,
+}
+
+impl Test {
+ fn iter<'a>(&'a self) -> Box<dyn Iterator<Item = usize> + 'a> {
+ unimplemented!()
+ }
+}
+
+trait LintContext<'a> {}
+
+fn f<'a, T: LintContext<'a>>(_: &T) {}
+
+fn test<'a>(x: &'a [u8]) -> u8 {
+ let y: &'a u8 = &x[5];
+ *y
+}
+
+// Issue #3284: give hint regarding lifetime in return type.
+struct Cow<'a> {
+ x: &'a str,
+}
+fn out_return_type_lts<'a>(e: &'a str) -> Cow<'a> {
+ unimplemented!()
+}
+
+// Make sure we still warn on implementations
+mod issue4291 {
+ trait BadTrait {
+ fn needless_lt<'a>(x: &'a u8) {}
+ }
+
+ impl BadTrait for () {
+ fn needless_lt<'a>(_x: &'a u8) {}
+ }
+}
+
+mod issue2944 {
+ trait Foo {}
+ struct Bar {}
+ struct Baz<'a> {
+ bar: &'a Bar,
+ }
+
+ impl<'a> Foo for Baz<'a> {}
+ impl Bar {
+ fn baz<'a>(&'a self) -> impl Foo + 'a {
+ Baz { bar: self }
+ }
+ }
+}
+
+mod nested_elision_sites {
+ // issue #issue2944
+
+ // closure trait bounds subject to nested elision
+ // don't lint because they refer to outer lifetimes
+ fn trait_fn<'a>(i: &'a i32) -> impl Fn() -> &'a i32 {
+ move || i
+ }
+ fn trait_fn_mut<'a>(i: &'a i32) -> impl FnMut() -> &'a i32 {
+ move || i
+ }
+ fn trait_fn_once<'a>(i: &'a i32) -> impl FnOnce() -> &'a i32 {
+ move || i
+ }
+
+ // don't lint
+ fn impl_trait_in_input_position<'a>(f: impl Fn() -> &'a i32) -> &'a i32 {
+ f()
+ }
+ fn impl_trait_in_output_position<'a>(i: &'a i32) -> impl Fn() -> &'a i32 {
+ move || i
+ }
+ // lint
+ fn impl_trait_elidable_nested_named_lifetimes<'a>(i: &'a i32, f: impl for<'b> Fn(&'b i32) -> &'b i32) -> &'a i32 {
+ f(i)
+ }
+ fn impl_trait_elidable_nested_anonymous_lifetimes<'a>(i: &'a i32, f: impl Fn(&i32) -> &i32) -> &'a i32 {
+ f(i)
+ }
+
+ // don't lint
+ fn generics_not_elidable<'a, T: Fn() -> &'a i32>(f: T) -> &'a i32 {
+ f()
+ }
+ // lint
+ fn generics_elidable<'a, T: Fn(&i32) -> &i32>(i: &'a i32, f: T) -> &'a i32 {
+ f(i)
+ }
+
+ // don't lint
+ fn where_clause_not_elidable<'a, T>(f: T) -> &'a i32
+ where
+ T: Fn() -> &'a i32,
+ {
+ f()
+ }
+ // lint
+ fn where_clause_elidadable<'a, T>(i: &'a i32, f: T) -> &'a i32
+ where
+ T: Fn(&i32) -> &i32,
+ {
+ f(i)
+ }
+
+ // don't lint
+ fn pointer_fn_in_input_position<'a>(f: fn(&'a i32) -> &'a i32, i: &'a i32) -> &'a i32 {
+ f(i)
+ }
+ fn pointer_fn_in_output_position<'a>(_: &'a i32) -> fn(&'a i32) -> &'a i32 {
+ |i| i
+ }
+ // lint
+ fn pointer_fn_elidable<'a>(i: &'a i32, f: fn(&i32) -> &i32) -> &'a i32 {
+ f(i)
+ }
+
+ // don't lint
+ fn nested_fn_pointer_1<'a>(_: &'a i32) -> fn(fn(&'a i32) -> &'a i32) -> i32 {
+ |f| 42
+ }
+ fn nested_fn_pointer_2<'a>(_: &'a i32) -> impl Fn(fn(&'a i32)) {
+ |f| ()
+ }
+
+ // lint
+ fn nested_fn_pointer_3<'a>(_: &'a i32) -> fn(fn(&i32) -> &i32) -> i32 {
+ |f| 42
+ }
+ fn nested_fn_pointer_4<'a>(_: &'a i32) -> impl Fn(fn(&i32)) {
+ |f| ()
+ }
+}
+
+mod issue6159 {
+ use std::ops::Deref;
+ pub fn apply_deref<'a, T, F, R>(x: &'a T, f: F) -> R
+ where
+ T: Deref,
+ F: FnOnce(&'a T::Target) -> R,
+ {
+ f(x.deref())
+ }
+}
+
++mod issue7296 {
++ use std::rc::Rc;
++ use std::sync::Arc;
++
++ struct Foo;
++ impl Foo {
++ fn implicit<'a>(&'a self) -> &'a () {
++ &()
++ }
++ fn implicit_mut<'a>(&'a mut self) -> &'a () {
++ &()
++ }
++
++ fn explicit<'a>(self: &'a Arc<Self>) -> &'a () {
++ &()
++ }
++ fn explicit_mut<'a>(self: &'a mut Rc<Self>) -> &'a () {
++ &()
++ }
++
++ fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
++ &()
++ }
++ }
++
++ trait Bar {
++ fn implicit<'a>(&'a self) -> &'a ();
++ fn implicit_provided<'a>(&'a self) -> &'a () {
++ &()
++ }
++
++ fn explicit<'a>(self: &'a Arc<Self>) -> &'a ();
++ fn explicit_provided<'a>(self: &'a Arc<Self>) -> &'a () {
++ &()
++ }
++
++ fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a ();
++ fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
++ &()
++ }
++ }
++}
++
+fn main() {}
--- /dev/null
- --> $DIR/needless_lifetimes.rs:4:1
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:6:1
++ --> $DIR/needless_lifetimes.rs:10:1
+ |
+LL | fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::needless-lifetimes` implied by `-D warnings`
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:16:1
++ --> $DIR/needless_lifetimes.rs:12:1
+ |
+LL | fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:50:1
++ --> $DIR/needless_lifetimes.rs:22:1
+ |
+LL | fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:55:1
++ --> $DIR/needless_lifetimes.rs:56:1
+ |
+LL | fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:67:1
++ --> $DIR/needless_lifetimes.rs:61:1
+ |
+LL | fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()>
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:91:1
++ --> $DIR/needless_lifetimes.rs:73:1
+ |
+LL | fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:121:5
++ --> $DIR/needless_lifetimes.rs:97:1
+ |
+LL | fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:130:5
++ --> $DIR/needless_lifetimes.rs:127:5
+ |
+LL | fn self_and_out<'s>(&'s self) -> &'s u8 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:149:1
++ --> $DIR/needless_lifetimes.rs:136:5
+ |
+LL | fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:179:1
++ --> $DIR/needless_lifetimes.rs:155:1
+ |
+LL | fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:185:1
++ --> $DIR/needless_lifetimes.rs:185:1
+ |
+LL | fn trait_obj_elided2<'a>(_arg: &'a dyn Drop) -> &'a str {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:204:1
++ --> $DIR/needless_lifetimes.rs:191:1
+ |
+LL | fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:212:1
++ --> $DIR/needless_lifetimes.rs:210:1
+ |
+LL | fn named_input_elided_output<'a>(_arg: &'a str) -> &str {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:248:1
++ --> $DIR/needless_lifetimes.rs:218:1
+ |
+LL | fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:255:9
++ --> $DIR/needless_lifetimes.rs:254:1
+ |
+LL | fn out_return_type_lts<'a>(e: &'a str) -> Cow<'a> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:259:9
++ --> $DIR/needless_lifetimes.rs:261:9
+ |
+LL | fn needless_lt<'a>(x: &'a u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:272:9
++ --> $DIR/needless_lifetimes.rs:265:9
+ |
+LL | fn needless_lt<'a>(_x: &'a u8) {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:301:5
++ --> $DIR/needless_lifetimes.rs:278:9
+ |
+LL | fn baz<'a>(&'a self) -> impl Foo + 'a {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:304:5
++ --> $DIR/needless_lifetimes.rs:307:5
+ |
+LL | fn impl_trait_elidable_nested_named_lifetimes<'a>(i: &'a i32, f: impl for<'b> Fn(&'b i32) -> &'b i32) -> &'a i32 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:313:5
++ --> $DIR/needless_lifetimes.rs:310:5
+ |
+LL | fn impl_trait_elidable_nested_anonymous_lifetimes<'a>(i: &'a i32, f: impl Fn(&i32) -> &i32) -> &'a i32 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:325:5
++ --> $DIR/needless_lifetimes.rs:319:5
+ |
+LL | fn generics_elidable<'a, T: Fn(&i32) -> &i32>(i: &'a i32, f: T) -> &'a i32 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:340:5
++ --> $DIR/needless_lifetimes.rs:331:5
+ |
+LL | fn where_clause_elidadable<'a, T>(i: &'a i32, f: T) -> &'a i32
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:353:5
++ --> $DIR/needless_lifetimes.rs:346:5
+ |
+LL | fn pointer_fn_elidable<'a>(i: &'a i32, f: fn(&i32) -> &i32) -> &'a i32 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- --> $DIR/needless_lifetimes.rs:356:5
++ --> $DIR/needless_lifetimes.rs:359:5
+ |
+LL | fn nested_fn_pointer_3<'a>(_: &'a i32) -> fn(fn(&i32) -> &i32) -> i32 {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
- error: aborting due to 25 previous errors
++ --> $DIR/needless_lifetimes.rs:362:5
+ |
+LL | fn nested_fn_pointer_4<'a>(_: &'a i32) -> impl Fn(fn(&i32)) {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:384:9
++ |
++LL | fn implicit<'a>(&'a self) -> &'a () {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:387:9
++ |
++LL | fn implicit_mut<'a>(&'a mut self) -> &'a () {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:398:9
++ |
++LL | fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:404:9
++ |
++LL | fn implicit<'a>(&'a self) -> &'a ();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:405:9
++ |
++LL | fn implicit_provided<'a>(&'a self) -> &'a () {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:414:9
++ |
++LL | fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a ();
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
++ --> $DIR/needless_lifetimes.rs:415:9
++ |
++LL | fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++
++error: aborting due to 32 previous errors
+
--- /dev/null
+// run-rustfix
+
+#![warn(clippy::needless_question_mark)]
+#![allow(
+ clippy::needless_return,
+ clippy::unnecessary_unwrap,
+ clippy::upper_case_acronyms,
+ dead_code,
+ unused_must_use
+)]
+#![feature(custom_inner_attributes)]
+
+struct TO {
+ magic: Option<usize>,
+}
+
+struct TR {
+ magic: Result<usize, bool>,
+}
+
+fn simple_option_bad1(to: TO) -> Option<usize> {
+ // return as a statement
+ return to.magic;
+}
+
+// formatting will add a semi-colon, which would make
+// this identical to the test case above
+#[rustfmt::skip]
+fn simple_option_bad2(to: TO) -> Option<usize> {
+ // return as an expression
+ return to.magic
+}
+
+fn simple_option_bad3(to: TO) -> Option<usize> {
+ // block value "return"
+ to.magic
+}
+
+fn simple_option_bad4(to: Option<TO>) -> Option<usize> {
+ // single line closure
+ to.and_then(|t| t.magic)
+}
+
+// formatting this will remove the block brackets, making
+// this test identical to the one above
+#[rustfmt::skip]
+fn simple_option_bad5(to: Option<TO>) -> Option<usize> {
+ // closure with body
+ to.and_then(|t| {
+ t.magic
+ })
+}
+
+fn simple_result_bad1(tr: TR) -> Result<usize, bool> {
+ return tr.magic;
+}
+
+// formatting will add a semi-colon, which would make
+// this identical to the test case above
+#[rustfmt::skip]
+fn simple_result_bad2(tr: TR) -> Result<usize, bool> {
+ return tr.magic
+}
+
+fn simple_result_bad3(tr: TR) -> Result<usize, bool> {
+ tr.magic
+}
+
+fn simple_result_bad4(tr: Result<TR, bool>) -> Result<usize, bool> {
+ tr.and_then(|t| t.magic)
+}
+
+// formatting this will remove the block brackets, making
+// this test identical to the one above
+#[rustfmt::skip]
+fn simple_result_bad5(tr: Result<TR, bool>) -> Result<usize, bool> {
+ tr.and_then(|t| {
+ t.magic
+ })
+}
+
+fn also_bad(tr: Result<TR, bool>) -> Result<usize, bool> {
+ if tr.is_ok() {
+ let t = tr.unwrap();
+ return t.magic;
+ }
+ Err(false)
+}
+
+fn false_positive_test<U, T>(x: Result<(), U>) -> Result<(), T>
+where
+ T: From<U>,
+{
+ Ok(x?)
+}
+
+// not quite needless
+fn deref_ref(s: Option<&String>) -> Option<&str> {
+ Some(s?)
+}
+
+fn main() {}
+
+// #6921 if a macro wraps an expr in Some( ) and the ? is in the macro use,
+// the suggestion fails to apply; do not lint
+macro_rules! some_in_macro {
+ ($expr:expr) => {
+ || -> _ { Some($expr) }()
+ };
+}
+
+pub fn test1() {
+ let x = Some(3);
+ let _x = some_in_macro!(x?);
+}
+
+// this one is ok because both the ? and the Some are both inside the macro def
+macro_rules! some_and_qmark_in_macro {
+ ($expr:expr) => {
+ || -> Option<_> { Some($expr) }()
+ };
+}
+
+pub fn test2() {
+ let x = Some(3);
+ let _x = some_and_qmark_in_macro!(x?);
+}
++
++async fn async_option_bad(to: TO) -> Option<usize> {
++ let _ = Some(3);
++ to.magic
++}
++
++async fn async_deref_ref(s: Option<&String>) -> Option<&str> {
++ Some(s?)
++}
++
++async fn async_result_bad(s: TR) -> Result<usize, bool> {
++ s.magic
++}
--- /dev/null
+// run-rustfix
+
+#![warn(clippy::needless_question_mark)]
+#![allow(
+ clippy::needless_return,
+ clippy::unnecessary_unwrap,
+ clippy::upper_case_acronyms,
+ dead_code,
+ unused_must_use
+)]
+#![feature(custom_inner_attributes)]
+
+struct TO {
+ magic: Option<usize>,
+}
+
+struct TR {
+ magic: Result<usize, bool>,
+}
+
+fn simple_option_bad1(to: TO) -> Option<usize> {
+ // return as a statement
+ return Some(to.magic?);
+}
+
+// formatting will add a semi-colon, which would make
+// this identical to the test case above
+#[rustfmt::skip]
+fn simple_option_bad2(to: TO) -> Option<usize> {
+ // return as an expression
+ return Some(to.magic?)
+}
+
+fn simple_option_bad3(to: TO) -> Option<usize> {
+ // block value "return"
+ Some(to.magic?)
+}
+
+fn simple_option_bad4(to: Option<TO>) -> Option<usize> {
+ // single line closure
+ to.and_then(|t| Some(t.magic?))
+}
+
+// formatting this will remove the block brackets, making
+// this test identical to the one above
+#[rustfmt::skip]
+fn simple_option_bad5(to: Option<TO>) -> Option<usize> {
+ // closure with body
+ to.and_then(|t| {
+ Some(t.magic?)
+ })
+}
+
+fn simple_result_bad1(tr: TR) -> Result<usize, bool> {
+ return Ok(tr.magic?);
+}
+
+// formatting will add a semi-colon, which would make
+// this identical to the test case above
+#[rustfmt::skip]
+fn simple_result_bad2(tr: TR) -> Result<usize, bool> {
+ return Ok(tr.magic?)
+}
+
+fn simple_result_bad3(tr: TR) -> Result<usize, bool> {
+ Ok(tr.magic?)
+}
+
+fn simple_result_bad4(tr: Result<TR, bool>) -> Result<usize, bool> {
+ tr.and_then(|t| Ok(t.magic?))
+}
+
+// formatting this will remove the block brackets, making
+// this test identical to the one above
+#[rustfmt::skip]
+fn simple_result_bad5(tr: Result<TR, bool>) -> Result<usize, bool> {
+ tr.and_then(|t| {
+ Ok(t.magic?)
+ })
+}
+
+fn also_bad(tr: Result<TR, bool>) -> Result<usize, bool> {
+ if tr.is_ok() {
+ let t = tr.unwrap();
+ return Ok(t.magic?);
+ }
+ Err(false)
+}
+
+fn false_positive_test<U, T>(x: Result<(), U>) -> Result<(), T>
+where
+ T: From<U>,
+{
+ Ok(x?)
+}
+
+// not quite needless
+fn deref_ref(s: Option<&String>) -> Option<&str> {
+ Some(s?)
+}
+
+fn main() {}
+
+// #6921 if a macro wraps an expr in Some( ) and the ? is in the macro use,
+// the suggestion fails to apply; do not lint
+macro_rules! some_in_macro {
+ ($expr:expr) => {
+ || -> _ { Some($expr) }()
+ };
+}
+
+pub fn test1() {
+ let x = Some(3);
+ let _x = some_in_macro!(x?);
+}
+
+// this one is ok because both the ? and the Some are both inside the macro def
+macro_rules! some_and_qmark_in_macro {
+ ($expr:expr) => {
+ || -> Option<_> { Some(Some($expr)?) }()
+ };
+}
+
+pub fn test2() {
+ let x = Some(3);
+ let _x = some_and_qmark_in_macro!(x?);
+}
++
++async fn async_option_bad(to: TO) -> Option<usize> {
++ let _ = Some(3);
++ Some(to.magic?)
++}
++
++async fn async_deref_ref(s: Option<&String>) -> Option<&str> {
++ Some(s?)
++}
++
++async fn async_result_bad(s: TR) -> Result<usize, bool> {
++ Ok(s.magic?)
++}
--- /dev/null
- error: aborting due to 12 previous errors
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:23:12
+ |
+LL | return Some(to.magic?);
+ | ^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `to.magic`
+ |
+ = note: `-D clippy::needless-question-mark` implied by `-D warnings`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:31:12
+ |
+LL | return Some(to.magic?)
+ | ^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `to.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:36:5
+ |
+LL | Some(to.magic?)
+ | ^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `to.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:41:21
+ |
+LL | to.and_then(|t| Some(t.magic?))
+ | ^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `t.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:50:9
+ |
+LL | Some(t.magic?)
+ | ^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `t.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:55:12
+ |
+LL | return Ok(tr.magic?);
+ | ^^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `tr.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:62:12
+ |
+LL | return Ok(tr.magic?)
+ | ^^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `tr.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:66:5
+ |
+LL | Ok(tr.magic?)
+ | ^^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `tr.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:70:21
+ |
+LL | tr.and_then(|t| Ok(t.magic?))
+ | ^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `t.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:78:9
+ |
+LL | Ok(t.magic?)
+ | ^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `t.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:85:16
+ |
+LL | return Ok(t.magic?);
+ | ^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `t.magic`
+
+error: question mark operator is useless here
+ --> $DIR/needless_question_mark.rs:120:27
+ |
+LL | || -> Option<_> { Some(Some($expr)?) }()
+ | ^^^^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `Some($expr)`
+...
+LL | let _x = some_and_qmark_in_macro!(x?);
+ | ---------------------------- in this macro invocation
+ |
+ = note: this error originates in the macro `some_and_qmark_in_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
+
++error: question mark operator is useless here
++ --> $DIR/needless_question_mark.rs:131:5
++ |
++LL | Some(to.magic?)
++ | ^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `to.magic`
++
++error: question mark operator is useless here
++ --> $DIR/needless_question_mark.rs:139:5
++ |
++LL | Ok(s.magic?)
++ | ^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `s.magic`
++
++error: aborting due to 14 previous errors
+
--- /dev/null
- use std::ops::BitAnd;
+#![allow(unused_variables, clippy::blacklisted_name)]
+#![warn(clippy::op_ref)]
+use std::collections::HashSet;
++use std::ops::{BitAnd, Mul};
+
+fn main() {
+ let tracked_fds: HashSet<i32> = HashSet::new();
+ let new_fds = HashSet::new();
+ let unwanted = &tracked_fds - &new_fds;
+
+ let foo = &5 - &6;
+
+ let bar = String::new();
+ let bar = "foo" == &bar;
+
+ let a = "a".to_string();
+ let b = "a";
+
+ if b < &a {
+ println!("OK");
+ }
+
+ struct X(i32);
+ impl BitAnd for X {
+ type Output = X;
+ fn bitand(self, rhs: X) -> X {
+ X(self.0 & rhs.0)
+ }
+ }
+ impl<'a> BitAnd<&'a X> for X {
+ type Output = X;
+ fn bitand(self, rhs: &'a X) -> X {
+ X(self.0 & rhs.0)
+ }
+ }
+ let x = X(1);
+ let y = X(2);
+ let z = x & &y;
+
+ #[derive(Copy, Clone)]
+ struct Y(i32);
+ impl BitAnd for Y {
+ type Output = Y;
+ fn bitand(self, rhs: Y) -> Y {
+ Y(self.0 & rhs.0)
+ }
+ }
+ impl<'a> BitAnd<&'a Y> for Y {
+ type Output = Y;
+ fn bitand(self, rhs: &'a Y) -> Y {
+ Y(self.0 & rhs.0)
+ }
+ }
+ let x = Y(1);
+ let y = Y(2);
+ let z = x & &y;
+}
++
++#[derive(Clone, Copy)]
++struct A(i32);
++#[derive(Clone, Copy)]
++struct B(i32);
++
++impl Mul<&A> for B {
++ type Output = i32;
++ fn mul(self, rhs: &A) -> Self::Output {
++ self.0 * rhs.0
++ }
++}
++impl Mul<A> for B {
++ type Output = i32;
++ fn mul(self, rhs: A) -> Self::Output {
++ // Should not lint because removing the reference would lead to unconditional recursion
++ self * &rhs
++ }
++}
++impl Mul<&A> for A {
++ type Output = i32;
++ fn mul(self, rhs: &A) -> Self::Output {
++ self.0 * rhs.0
++ }
++}
++impl Mul<A> for A {
++ type Output = i32;
++ fn mul(self, rhs: A) -> Self::Output {
++ let one = B(1);
++ let two = 2;
++ let three = 3;
++ let _ = one * &self;
++ let _ = two + &three;
++ // Removing the reference would lead to unconditional recursion
++ self * &rhs
++ }
++}
--- /dev/null
- error: aborting due to 2 previous errors
+error: needlessly taken reference of both operands
+ --> $DIR/op_ref.rs:11:15
+ |
+LL | let foo = &5 - &6;
+ | ^^^^^^^
+ |
+ = note: `-D clippy::op-ref` implied by `-D warnings`
+help: use the values directly
+ |
+LL | let foo = 5 - 6;
+ | ~ ~
+
+error: taken reference of right operand
+ --> $DIR/op_ref.rs:56:13
+ |
+LL | let z = x & &y;
+ | ^^^^--
+ | |
+ | help: use the right value directly: `y`
+
++error: taken reference of right operand
++ --> $DIR/op_ref.rs:89:17
++ |
++LL | let _ = one * &self;
++ | ^^^^^^-----
++ | |
++ | help: use the right value directly: `self`
++
++error: taken reference of right operand
++ --> $DIR/op_ref.rs:90:17
++ |
++LL | let _ = two + &three;
++ | ^^^^^^------
++ | |
++ | help: use the right value directly: `three`
++
++error: aborting due to 4 previous errors
+
--- /dev/null
- // no error here
+#![allow(unused, clippy::many_single_char_names, clippy::redundant_clone)]
+#![warn(clippy::ptr_arg)]
+
+use std::borrow::Cow;
+use std::path::PathBuf;
+
+fn do_vec(x: &Vec<i64>) {
+ //Nothing here
+}
+
+fn do_vec_mut(x: &mut Vec<i64>) {
- // no error here
+ //Nothing here
+}
+
+fn do_str(x: &String) {
+ //Nothing here either
+}
+
+fn do_str_mut(x: &mut String) {
- // no error here
+ //Nothing here either
+}
+
+fn do_path(x: &PathBuf) {
+ //Nothing here either
+}
+
+fn do_path_mut(x: &mut PathBuf) {
- let h = g.clone(); // Alas, we cannot reliably detect this without following data.
+ //Nothing here either
+}
+
+fn main() {}
+
+trait Foo {
+ type Item;
+ fn do_vec(x: &Vec<i64>);
+ fn do_item(x: &Self::Item);
+}
+
+struct Bar;
+
+// no error, in trait impl (#425)
+impl Foo for Bar {
+ type Item = Vec<u8>;
+ fn do_vec(x: &Vec<i64>) {}
+ fn do_item(x: &Vec<u8>) {}
+}
+
+fn cloned(x: &Vec<u8>) -> Vec<u8> {
+ let e = x.clone();
+ let f = e.clone(); // OK
+ let g = x;
++ let h = g.clone();
+ let i = (e).clone();
+ x.clone()
+}
+
+fn str_cloned(x: &String) -> String {
+ let a = x.clone();
+ let b = x.clone();
+ let c = b.clone();
+ let d = a.clone().clone().clone();
+ x.clone()
+}
+
+fn path_cloned(x: &PathBuf) -> PathBuf {
+ let a = x.clone();
+ let b = x.clone();
+ let c = b.clone();
+ let d = a.clone().clone().clone();
+ x.clone()
+}
+
+fn false_positive_capacity(x: &Vec<u8>, y: &String) {
+ let a = x.capacity();
+ let b = y.clone();
+ let c = y.as_str();
+}
+
+fn false_positive_capacity_too(x: &String) -> String {
+ if x.capacity() > 1024 {
+ panic!("Too large!");
+ }
+ x.clone()
+}
+
+#[allow(dead_code)]
+fn test_cow_with_ref(c: &Cow<[i32]>) {}
+
+fn test_cow(c: Cow<[i32]>) {
+ let _c = c;
+}
+
+trait Foo2 {
+ fn do_string(&self);
+}
+
+// no error for &self references where self is of type String (#2293)
+impl Foo2 for String {
+ fn do_string(&self) {}
+}
+
+// Check that the allow attribute on parameters is honored
+mod issue_5644 {
+ use std::borrow::Cow;
+ use std::path::PathBuf;
+
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ ) {
+ }
+
+ struct S {}
+ impl S {
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ ) {
+ }
+ }
+
+ trait T {
+ fn allowed(
+ #[allow(clippy::ptr_arg)] _v: &Vec<u32>,
+ #[allow(clippy::ptr_arg)] _s: &String,
+ #[allow(clippy::ptr_arg)] _p: &PathBuf,
+ #[allow(clippy::ptr_arg)] _c: &Cow<[i32]>,
+ ) {
+ }
+ }
+}
+
+mod issue6509 {
+ use std::path::PathBuf;
+
+ fn foo_vec(vec: &Vec<u8>) {
+ let _ = vec.clone().pop();
+ let _ = vec.clone().clone();
+ }
+
+ fn foo_path(path: &PathBuf) {
+ let _ = path.clone().pop();
+ let _ = path.clone().clone();
+ }
+
+ fn foo_str(str: &PathBuf) {
+ let _ = str.clone().pop();
+ let _ = str.clone().clone();
+ }
+}
+
++fn mut_vec_slice_methods(v: &mut Vec<u32>) {
++ v.copy_within(1..5, 10);
++}
++
++fn mut_vec_vec_methods(v: &mut Vec<u32>) {
++ v.clear();
++}
++
++fn vec_contains(v: &Vec<u32>) -> bool {
++ [vec![], vec![0]].as_slice().contains(v)
++}
++
++fn fn_requires_vec(v: &Vec<u32>) -> bool {
++ vec_contains(v)
++}
++
++fn impl_fn_requires_vec(v: &Vec<u32>, f: impl Fn(&Vec<u32>)) {
++ f(v);
++}
++
++fn dyn_fn_requires_vec(v: &Vec<u32>, f: &dyn Fn(&Vec<u32>)) {
++ f(v);
++}
++
+// No error for types behind an alias (#7699)
+type A = Vec<u8>;
+fn aliased(a: &A) {}
--- /dev/null
- error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
++error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
+ --> $DIR/ptr_arg.rs:7:14
+ |
+LL | fn do_vec(x: &Vec<i64>) {
+ | ^^^^^^^^^ help: change this to: `&[i64]`
+ |
+ = note: `-D clippy::ptr-arg` implied by `-D warnings`
+
++error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:11:18
++ |
++LL | fn do_vec_mut(x: &mut Vec<i64>) {
++ | ^^^^^^^^^^^^^ help: change this to: `&mut [i64]`
++
+error: writing `&String` instead of `&str` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:16:14
++ --> $DIR/ptr_arg.rs:15:14
+ |
+LL | fn do_str(x: &String) {
+ | ^^^^^^^ help: change this to: `&str`
+
++error: writing `&mut String` instead of `&mut str` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:19:18
++ |
++LL | fn do_str_mut(x: &mut String) {
++ | ^^^^^^^^^^^ help: change this to: `&mut str`
++
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:25:15
++ --> $DIR/ptr_arg.rs:23:15
+ |
+LL | fn do_path(x: &PathBuf) {
+ | ^^^^^^^^ help: change this to: `&Path`
+
- error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
- --> $DIR/ptr_arg.rs:38:18
++error: writing `&mut PathBuf` instead of `&mut Path` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:27:19
++ |
++LL | fn do_path_mut(x: &mut PathBuf) {
++ | ^^^^^^^^^^^^ help: change this to: `&mut Path`
++
++error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:35:18
+ |
+LL | fn do_vec(x: &Vec<i64>);
+ | ^^^^^^^^^ help: change this to: `&[i64]`
+
- error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
- --> $DIR/ptr_arg.rs:51:14
++error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:48:14
+ |
+LL | fn cloned(x: &Vec<u8>) -> Vec<u8> {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
- LL | fn cloned(x: &[u8]) -> Vec<u8> {
- | ~~~~~
- help: change `x.clone()` to
- |
- LL | let e = x.to_owned();
- | ~~~~~~~~~~~~
- help: change `x.clone()` to
- |
- LL | x.to_owned()
- |
++LL ~ fn cloned(x: &[u8]) -> Vec<u8> {
++LL ~ let e = x.to_owned();
++LL | let f = e.clone(); // OK
++LL | let g = x;
++LL ~ let h = g.to_owned();
++LL | let i = (e).clone();
++ ...
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:60:18
++ --> $DIR/ptr_arg.rs:57:18
+ |
+LL | fn str_cloned(x: &String) -> String {
+ | ^^^^^^^
+ |
+help: change this to
+ |
- LL | fn str_cloned(x: &str) -> String {
- | ~~~~
- help: change `x.clone()` to
- |
- LL | let a = x.to_string();
- | ~~~~~~~~~~~~~
- help: change `x.clone()` to
- |
- LL | let b = x.to_string();
- | ~~~~~~~~~~~~~
- help: change `x.clone()` to
- |
- LL | x.to_string()
++LL ~ fn str_cloned(x: &str) -> String {
++LL ~ let a = x.to_owned();
++LL ~ let b = x.to_owned();
++LL | let c = b.clone();
++LL | let d = a.clone().clone().clone();
++LL ~ x.to_owned()
+ |
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:68:19
++ --> $DIR/ptr_arg.rs:65:19
+ |
+LL | fn path_cloned(x: &PathBuf) -> PathBuf {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
- LL | fn path_cloned(x: &Path) -> PathBuf {
- | ~~~~~
- help: change `x.clone()` to
- |
- LL | let a = x.to_path_buf();
- | ~~~~~~~~~~~~~~~
- help: change `x.clone()` to
- |
- LL | let b = x.to_path_buf();
- | ~~~~~~~~~~~~~~~
- help: change `x.clone()` to
- |
- LL | x.to_path_buf()
++LL ~ fn path_cloned(x: &Path) -> PathBuf {
++LL ~ let a = x.to_path_buf();
++LL ~ let b = x.to_path_buf();
++LL | let c = b.clone();
++LL | let d = a.clone().clone().clone();
++LL ~ x.to_path_buf()
+ |
+
+error: writing `&String` instead of `&str` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:76:44
++ --> $DIR/ptr_arg.rs:73:44
+ |
+LL | fn false_positive_capacity(x: &Vec<u8>, y: &String) {
+ | ^^^^^^^
+ |
+help: change this to
+ |
- LL | fn false_positive_capacity(x: &Vec<u8>, y: &str) {
- | ~~~~
- help: change `y.clone()` to
++LL ~ fn false_positive_capacity(x: &Vec<u8>, y: &str) {
++LL | let a = x.capacity();
++LL ~ let b = y.to_owned();
++LL ~ let c = y;
+ |
- LL | let b = y.to_string();
- | ~~~~~~~~~~~~~
- help: change `y.as_str()` to
- |
- LL | let c = y;
- | ~
+
+error: using a reference to `Cow` is not recommended
- --> $DIR/ptr_arg.rs:90:25
++ --> $DIR/ptr_arg.rs:87:25
+ |
+LL | fn test_cow_with_ref(c: &Cow<[i32]>) {}
+ | ^^^^^^^^^^^ help: change this to: `&[i32]`
+
- error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
- --> $DIR/ptr_arg.rs:143:21
++error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:140:21
+ |
+LL | fn foo_vec(vec: &Vec<u8>) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
- LL | fn foo_vec(vec: &[u8]) {
- | ~~~~~
- help: change `vec.clone()` to
- |
- LL | let _ = vec.to_owned().pop();
- | ~~~~~~~~~~~~~~
- help: change `vec.clone()` to
++LL ~ fn foo_vec(vec: &[u8]) {
++LL ~ let _ = vec.to_owned().pop();
++LL ~ let _ = vec.to_owned().clone();
+ |
- LL | let _ = vec.to_owned().clone();
- | ~~~~~~~~~~~~~~
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:148:23
++ --> $DIR/ptr_arg.rs:145:23
+ |
+LL | fn foo_path(path: &PathBuf) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
- LL | fn foo_path(path: &Path) {
- | ~~~~~
- help: change `path.clone()` to
++LL ~ fn foo_path(path: &Path) {
++LL ~ let _ = path.to_path_buf().pop();
++LL ~ let _ = path.to_path_buf().clone();
+ |
- LL | let _ = path.to_path_buf().pop();
- | ~~~~~~~~~~~~~~~~~~
- help: change `path.clone()` to
- |
- LL | let _ = path.to_path_buf().clone();
- | ~~~~~~~~~~~~~~~~~~
+
+error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
- --> $DIR/ptr_arg.rs:153:21
++ --> $DIR/ptr_arg.rs:150:21
+ |
+LL | fn foo_str(str: &PathBuf) {
+ | ^^^^^^^^
+ |
+help: change this to
+ |
- LL | fn foo_str(str: &Path) {
- | ~~~~~
- help: change `str.clone()` to
++LL ~ fn foo_str(str: &Path) {
++LL ~ let _ = str.to_path_buf().pop();
++LL ~ let _ = str.to_path_buf().clone();
+ |
- LL | let _ = str.to_path_buf().pop();
- | ~~~~~~~~~~~~~~~~~
- help: change `str.clone()` to
++
++error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
++ --> $DIR/ptr_arg.rs:156:29
+ |
- LL | let _ = str.to_path_buf().clone();
- | ~~~~~~~~~~~~~~~~~
++LL | fn mut_vec_slice_methods(v: &mut Vec<u32>) {
++ | ^^^^^^^^^^^^^ help: change this to: `&mut [u32]`
+
- error: aborting due to 12 previous errors
++error: aborting due to 16 previous errors
+
--- /dev/null
- #[allow(clippy::deref_addrof, dead_code)]
+// run-rustfix
+
+#![warn(clippy::all)]
+#![warn(clippy::redundant_pattern_matching)]
+#![allow(
+ unused_must_use,
+ clippy::needless_bool,
+ clippy::match_like_matches_macro,
+ clippy::equatable_if_let,
+ clippy::if_same_then_else
+)]
+
+fn main() {
+ if None::<()>.is_none() {}
+
+ if Some(42).is_some() {}
+
+ if Some(42).is_some() {
+ foo();
+ } else {
+ bar();
+ }
+
+ while Some(42).is_some() {}
+
+ while Some(42).is_none() {}
+
+ while None::<()>.is_none() {}
+
+ let mut v = vec![1, 2, 3];
+ while v.pop().is_some() {
+ foo();
+ }
+
+ if None::<i32>.is_none() {}
+
+ if Some(42).is_some() {}
+
+ Some(42).is_some();
+
+ None::<()>.is_none();
+
+ let _ = None::<()>.is_none();
+
+ let opt = Some(false);
+ let _ = if opt.is_some() { true } else { false };
+
+ issue6067();
+
+ let _ = if gen_opt().is_some() {
+ 1
+ } else if gen_opt().is_none() {
+ 2
+ } else {
+ 3
+ };
+}
+
+fn gen_opt() -> Option<()> {
+ None
+}
+
+fn foo() {}
+
+fn bar() {}
+
+// Methods that are unstable const should not be suggested within a const context, see issue #5697.
+// However, in Rust 1.48.0 the methods `is_some` and `is_none` of `Option` were stabilized as const,
+// so the following should be linted.
+const fn issue6067() {
+ if Some(42).is_some() {}
+
+ if None::<()>.is_none() {}
+
+ while Some(42).is_some() {}
+
+ while None::<()>.is_none() {}
+
+ Some(42).is_some();
+
+ None::<()>.is_none();
+}
+
++#[allow(clippy::deref_addrof, dead_code, clippy::needless_borrow)]
+fn issue7921() {
+ if (&None::<()>).is_none() {}
+ if (&None::<()>).is_none() {}
+}
--- /dev/null
- #[allow(clippy::deref_addrof, dead_code)]
+// run-rustfix
+
+#![warn(clippy::all)]
+#![warn(clippy::redundant_pattern_matching)]
+#![allow(
+ unused_must_use,
+ clippy::needless_bool,
+ clippy::match_like_matches_macro,
+ clippy::equatable_if_let,
+ clippy::if_same_then_else
+)]
+
+fn main() {
+ if let None = None::<()> {}
+
+ if let Some(_) = Some(42) {}
+
+ if let Some(_) = Some(42) {
+ foo();
+ } else {
+ bar();
+ }
+
+ while let Some(_) = Some(42) {}
+
+ while let None = Some(42) {}
+
+ while let None = None::<()> {}
+
+ let mut v = vec![1, 2, 3];
+ while let Some(_) = v.pop() {
+ foo();
+ }
+
+ if None::<i32>.is_none() {}
+
+ if Some(42).is_some() {}
+
+ match Some(42) {
+ Some(_) => true,
+ None => false,
+ };
+
+ match None::<()> {
+ Some(_) => false,
+ None => true,
+ };
+
+ let _ = match None::<()> {
+ Some(_) => false,
+ None => true,
+ };
+
+ let opt = Some(false);
+ let _ = if let Some(_) = opt { true } else { false };
+
+ issue6067();
+
+ let _ = if let Some(_) = gen_opt() {
+ 1
+ } else if let None = gen_opt() {
+ 2
+ } else {
+ 3
+ };
+}
+
+fn gen_opt() -> Option<()> {
+ None
+}
+
+fn foo() {}
+
+fn bar() {}
+
+// Methods that are unstable const should not be suggested within a const context, see issue #5697.
+// However, in Rust 1.48.0 the methods `is_some` and `is_none` of `Option` were stabilized as const,
+// so the following should be linted.
+const fn issue6067() {
+ if let Some(_) = Some(42) {}
+
+ if let None = None::<()> {}
+
+ while let Some(_) = Some(42) {}
+
+ while let None = None::<()> {}
+
+ match Some(42) {
+ Some(_) => true,
+ None => false,
+ };
+
+ match None::<()> {
+ Some(_) => false,
+ None => true,
+ };
+}
+
++#[allow(clippy::deref_addrof, dead_code, clippy::needless_borrow)]
+fn issue7921() {
+ if let None = *(&None::<()>) {}
+ if let None = *&None::<()> {}
+}
--- /dev/null
+//! Test for Clippy lint renames.
+// run-rustfix
+
+#![allow(dead_code)]
+// allow the new lint name here, to test if the new name works
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::for_loops_over_fallibles)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::invisible_characters)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::match_result_ok)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::disallowed_methods)]
+// uplifted lints
+#![allow(invalid_value)]
+#![allow(array_into_iter)]
+#![allow(unused_labels)]
+#![allow(drop_bounds)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(non_fmt_panics)]
+#![allow(unknown_lints)]
+#![allow(invalid_atomic_ordering)]
+#![allow(enum_intrinsics_non_enums)]
+// warn for the old lint name here, to test if the renaming worked
+#![warn(clippy::module_name_repetitions)]
+#![warn(clippy::new_without_default)]
+#![warn(clippy::redundant_static_lifetimes)]
+#![warn(clippy::cognitive_complexity)]
+#![warn(clippy::bind_instead_of_map)]
+#![warn(clippy::box_collection)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::blocks_in_if_conditions)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::map_unwrap_or)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::unwrap_used)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::expect_used)]
+#![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::for_loops_over_fallibles)]
+#![warn(clippy::useless_conversion)]
+#![warn(clippy::invisible_characters)]
+#![warn(clippy::single_char_add_str)]
+#![warn(clippy::match_result_ok)]
+#![warn(clippy::disallowed_types)]
+#![warn(clippy::disallowed_methods)]
++#![warn(clippy::needless_borrow)]
+// uplifted lints
+#![warn(invalid_value)]
+#![warn(array_into_iter)]
+#![warn(unused_labels)]
+#![warn(drop_bounds)]
+#![warn(temporary_cstring_as_ptr)]
+#![warn(non_fmt_panics)]
+#![warn(unknown_lints)]
+#![warn(invalid_atomic_ordering)]
+#![warn(enum_intrinsics_non_enums)]
+
+fn main() {}
--- /dev/null
+//! Test for Clippy lint renames.
+// run-rustfix
+
+#![allow(dead_code)]
+// allow the new lint name here, to test if the new name works
+#![allow(clippy::module_name_repetitions)]
+#![allow(clippy::new_without_default)]
+#![allow(clippy::redundant_static_lifetimes)]
+#![allow(clippy::cognitive_complexity)]
+#![allow(clippy::bind_instead_of_map)]
+#![allow(clippy::box_collection)]
+#![allow(clippy::blocks_in_if_conditions)]
+#![allow(clippy::map_unwrap_or)]
+#![allow(clippy::unwrap_used)]
+#![allow(clippy::expect_used)]
+#![allow(clippy::for_loops_over_fallibles)]
+#![allow(clippy::useless_conversion)]
+#![allow(clippy::invisible_characters)]
+#![allow(clippy::single_char_add_str)]
+#![allow(clippy::match_result_ok)]
+#![allow(clippy::disallowed_types)]
+#![allow(clippy::disallowed_methods)]
+// uplifted lints
+#![allow(invalid_value)]
+#![allow(array_into_iter)]
+#![allow(unused_labels)]
+#![allow(drop_bounds)]
+#![allow(temporary_cstring_as_ptr)]
+#![allow(non_fmt_panics)]
+#![allow(unknown_lints)]
+#![allow(invalid_atomic_ordering)]
+#![allow(enum_intrinsics_non_enums)]
+// warn for the old lint name here, to test if the renaming worked
+#![warn(clippy::stutter)]
+#![warn(clippy::new_without_default_derive)]
+#![warn(clippy::const_static_lifetime)]
+#![warn(clippy::cyclomatic_complexity)]
+#![warn(clippy::option_and_then_some)]
+#![warn(clippy::box_vec)]
+#![warn(clippy::block_in_if_condition_expr)]
+#![warn(clippy::block_in_if_condition_stmt)]
+#![warn(clippy::option_map_unwrap_or)]
+#![warn(clippy::option_map_unwrap_or_else)]
+#![warn(clippy::result_map_unwrap_or_else)]
+#![warn(clippy::option_unwrap_used)]
+#![warn(clippy::result_unwrap_used)]
+#![warn(clippy::option_expect_used)]
+#![warn(clippy::result_expect_used)]
+#![warn(clippy::for_loop_over_option)]
+#![warn(clippy::for_loop_over_result)]
+#![warn(clippy::identity_conversion)]
+#![warn(clippy::zero_width_space)]
+#![warn(clippy::single_char_push_str)]
+#![warn(clippy::if_let_some_result)]
+#![warn(clippy::disallowed_type)]
+#![warn(clippy::disallowed_method)]
++#![warn(clippy::ref_in_deref)]
+// uplifted lints
+#![warn(clippy::invalid_ref)]
+#![warn(clippy::into_iter_on_array)]
+#![warn(clippy::unused_label)]
+#![warn(clippy::drop_bounds)]
+#![warn(clippy::temporary_cstring_as_ptr)]
+#![warn(clippy::panic_params)]
+#![warn(clippy::unknown_clippy_lints)]
+#![warn(clippy::invalid_atomic_ordering)]
+#![warn(clippy::mem_discriminant_non_enum)]
+
+fn main() {}
--- /dev/null
- --> $DIR/rename.rs:58:9
+error: lint `clippy::stutter` has been renamed to `clippy::module_name_repetitions`
+ --> $DIR/rename.rs:34:9
+ |
+LL | #![warn(clippy::stutter)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::module_name_repetitions`
+ |
+ = note: `-D renamed-and-removed-lints` implied by `-D warnings`
+
+error: lint `clippy::new_without_default_derive` has been renamed to `clippy::new_without_default`
+ --> $DIR/rename.rs:35:9
+ |
+LL | #![warn(clippy::new_without_default_derive)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::new_without_default`
+
+error: lint `clippy::const_static_lifetime` has been renamed to `clippy::redundant_static_lifetimes`
+ --> $DIR/rename.rs:36:9
+ |
+LL | #![warn(clippy::const_static_lifetime)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::redundant_static_lifetimes`
+
+error: lint `clippy::cyclomatic_complexity` has been renamed to `clippy::cognitive_complexity`
+ --> $DIR/rename.rs:37:9
+ |
+LL | #![warn(clippy::cyclomatic_complexity)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::cognitive_complexity`
+
+error: lint `clippy::option_and_then_some` has been renamed to `clippy::bind_instead_of_map`
+ --> $DIR/rename.rs:38:9
+ |
+LL | #![warn(clippy::option_and_then_some)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::bind_instead_of_map`
+
+error: lint `clippy::box_vec` has been renamed to `clippy::box_collection`
+ --> $DIR/rename.rs:39:9
+ |
+LL | #![warn(clippy::box_vec)]
+ | ^^^^^^^^^^^^^^^ help: use the new name: `clippy::box_collection`
+
+error: lint `clippy::block_in_if_condition_expr` has been renamed to `clippy::blocks_in_if_conditions`
+ --> $DIR/rename.rs:40:9
+ |
+LL | #![warn(clippy::block_in_if_condition_expr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
+
+error: lint `clippy::block_in_if_condition_stmt` has been renamed to `clippy::blocks_in_if_conditions`
+ --> $DIR/rename.rs:41:9
+ |
+LL | #![warn(clippy::block_in_if_condition_stmt)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::blocks_in_if_conditions`
+
+error: lint `clippy::option_map_unwrap_or` has been renamed to `clippy::map_unwrap_or`
+ --> $DIR/rename.rs:42:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
+ --> $DIR/rename.rs:43:9
+ |
+LL | #![warn(clippy::option_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::result_map_unwrap_or_else` has been renamed to `clippy::map_unwrap_or`
+ --> $DIR/rename.rs:44:9
+ |
+LL | #![warn(clippy::result_map_unwrap_or_else)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::map_unwrap_or`
+
+error: lint `clippy::option_unwrap_used` has been renamed to `clippy::unwrap_used`
+ --> $DIR/rename.rs:45:9
+ |
+LL | #![warn(clippy::option_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::result_unwrap_used` has been renamed to `clippy::unwrap_used`
+ --> $DIR/rename.rs:46:9
+ |
+LL | #![warn(clippy::result_unwrap_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::unwrap_used`
+
+error: lint `clippy::option_expect_used` has been renamed to `clippy::expect_used`
+ --> $DIR/rename.rs:47:9
+ |
+LL | #![warn(clippy::option_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::result_expect_used` has been renamed to `clippy::expect_used`
+ --> $DIR/rename.rs:48:9
+ |
+LL | #![warn(clippy::result_expect_used)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::expect_used`
+
+error: lint `clippy::for_loop_over_option` has been renamed to `clippy::for_loops_over_fallibles`
+ --> $DIR/rename.rs:49:9
+ |
+LL | #![warn(clippy::for_loop_over_option)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::for_loops_over_fallibles`
+
+error: lint `clippy::for_loop_over_result` has been renamed to `clippy::for_loops_over_fallibles`
+ --> $DIR/rename.rs:50:9
+ |
+LL | #![warn(clippy::for_loop_over_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::for_loops_over_fallibles`
+
+error: lint `clippy::identity_conversion` has been renamed to `clippy::useless_conversion`
+ --> $DIR/rename.rs:51:9
+ |
+LL | #![warn(clippy::identity_conversion)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::useless_conversion`
+
+error: lint `clippy::zero_width_space` has been renamed to `clippy::invisible_characters`
+ --> $DIR/rename.rs:52:9
+ |
+LL | #![warn(clippy::zero_width_space)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::invisible_characters`
+
+error: lint `clippy::single_char_push_str` has been renamed to `clippy::single_char_add_str`
+ --> $DIR/rename.rs:53:9
+ |
+LL | #![warn(clippy::single_char_push_str)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::single_char_add_str`
+
+error: lint `clippy::if_let_some_result` has been renamed to `clippy::match_result_ok`
+ --> $DIR/rename.rs:54:9
+ |
+LL | #![warn(clippy::if_let_some_result)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::match_result_ok`
+
+error: lint `clippy::disallowed_type` has been renamed to `clippy::disallowed_types`
+ --> $DIR/rename.rs:55:9
+ |
+LL | #![warn(clippy::disallowed_type)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_types`
+
+error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_methods`
+ --> $DIR/rename.rs:56:9
+ |
+LL | #![warn(clippy::disallowed_method)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
+
++error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
++ --> $DIR/rename.rs:57:9
++ |
++LL | #![warn(clippy::ref_in_deref)]
++ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
++
+error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
- --> $DIR/rename.rs:59:9
++ --> $DIR/rename.rs:59:9
+ |
+LL | #![warn(clippy::invalid_ref)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
+
+error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
- --> $DIR/rename.rs:60:9
++ --> $DIR/rename.rs:60:9
+ |
+LL | #![warn(clippy::into_iter_on_array)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
+
+error: lint `clippy::unused_label` has been renamed to `unused_labels`
- --> $DIR/rename.rs:61:9
++ --> $DIR/rename.rs:61:9
+ |
+LL | #![warn(clippy::unused_label)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
+
+error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
- --> $DIR/rename.rs:62:9
++ --> $DIR/rename.rs:62:9
+ |
+LL | #![warn(clippy::drop_bounds)]
+ | ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
+
+error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
- --> $DIR/rename.rs:63:9
++ --> $DIR/rename.rs:63:9
+ |
+LL | #![warn(clippy::temporary_cstring_as_ptr)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
+
+error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
- --> $DIR/rename.rs:64:9
++ --> $DIR/rename.rs:64:9
+ |
+LL | #![warn(clippy::panic_params)]
+ | ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
+
+error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
- --> $DIR/rename.rs:65:9
++ --> $DIR/rename.rs:65:9
+ |
+LL | #![warn(clippy::unknown_clippy_lints)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
+
+error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
- --> $DIR/rename.rs:66:9
++ --> $DIR/rename.rs:66:9
+ |
+LL | #![warn(clippy::invalid_atomic_ordering)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
+
+error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
- error: aborting due to 32 previous errors
++ --> $DIR/rename.rs:67:9
+ |
+LL | #![warn(clippy::mem_discriminant_non_enum)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
+
++error: aborting due to 33 previous errors
+
--- /dev/null
- fn test_string_1(s: &String) -> bool {
+// run-rustfix
+#![allow(dead_code)]
+#![warn(clippy::search_is_some)]
+
+fn main() {
+ let v = vec![3, 2, 1, 0, -1, -2, -3];
+ let y = &&42;
+
+ // Check `find().is_none()`, single-line case.
+ let _ = v.iter().find(|&x| *x < 0).is_none();
+ let _ = (0..1).find(|x| **y == *x).is_none(); // one dereference less
+ let _ = (0..1).find(|x| *x == 0).is_none();
+ let _ = v.iter().find(|x| **x == 0).is_none();
+ let _ = (4..5).find(|x| *x == 1 || *x == 3 || *x == 5).is_none();
+ let _ = (1..3).find(|x| [1, 2, 3].contains(x)).is_none();
+ let _ = (1..3).find(|x| *x == 0 || [1, 2, 3].contains(x)).is_none();
+ let _ = (1..3).find(|x| [1, 2, 3].contains(x) || *x == 0).is_none();
+ let _ = (1..3)
+ .find(|x| [1, 2, 3].contains(x) || *x == 0 || [4, 5, 6].contains(x) || *x == -1)
+ .is_none();
+
+ // Check `position().is_none()`, single-line case.
+ let _ = v.iter().position(|&x| x < 0).is_none();
+
+ // Check `rposition().is_none()`, single-line case.
+ let _ = v.iter().rposition(|&x| x < 0).is_none();
+
+ let s1 = String::from("hello world");
+ let s2 = String::from("world");
+
+ // caller of `find()` is a `&`static str`
+ let _ = "hello world".find("world").is_none();
+ let _ = "hello world".find(&s2).is_none();
+ let _ = "hello world".find(&s2[2..]).is_none();
+ // caller of `find()` is a `String`
+ let _ = s1.find("world").is_none();
+ let _ = s1.find(&s2).is_none();
+ let _ = s1.find(&s2[2..]).is_none();
+ // caller of `find()` is slice of `String`
+ let _ = s1[2..].find("world").is_none();
+ let _ = s1[2..].find(&s2).is_none();
+ let _ = s1[2..].find(&s2[2..]).is_none();
+}
+
+#[allow(clippy::clone_on_copy, clippy::map_clone)]
+mod issue7392 {
+ struct Player {
+ hand: Vec<usize>,
+ }
+ fn filter() {
+ let p = Player {
+ hand: vec![1, 2, 3, 4, 5],
+ };
+ let filter_hand = vec![5];
+ let _ = p
+ .hand
+ .iter()
+ .filter(|c| filter_hand.iter().find(|cc| c == cc).is_none())
+ .map(|c| c.clone())
+ .collect::<Vec<_>>();
+ }
+
+ struct PlayerTuple {
+ hand: Vec<(usize, char)>,
+ }
+ fn filter_tuple() {
+ let p = PlayerTuple {
+ hand: vec![(1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'), (5, 'e')],
+ };
+ let filter_hand = vec![5];
+ let _ = p
+ .hand
+ .iter()
+ .filter(|(c, _)| filter_hand.iter().find(|cc| c == *cc).is_none())
+ .map(|c| c.clone())
+ .collect::<Vec<_>>();
+ }
+
+ fn field_projection() {
+ struct Foo {
+ foo: i32,
+ bar: u32,
+ }
+ let vfoo = vec![Foo { foo: 1, bar: 2 }];
+ let _ = vfoo.iter().find(|v| v.foo == 1 && v.bar == 2).is_none();
+
+ let vfoo = vec![(42, Foo { foo: 1, bar: 2 })];
+ let _ = vfoo
+ .iter()
+ .find(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2)
+ .is_none();
+ }
+
+ fn index_projection() {
+ let vfoo = vec![[0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|a| a[0] == 42).is_none();
+ }
+
+ #[allow(clippy::match_like_matches_macro)]
+ fn slice_projection() {
+ let vfoo = vec![[0, 1, 2, 3, 0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|sub| sub[1..4].len() == 3).is_none();
+ }
+
+ fn please(x: &u32) -> bool {
+ *x == 9
+ }
+
+ fn deref_enough(x: u32) -> bool {
+ x == 78
+ }
+
+ fn arg_no_deref(x: &&u32) -> bool {
+ **x == 78
+ }
+
+ fn more_projections() {
+ let x = 19;
+ let ppx: &u32 = &x;
+ let _ = [ppx].iter().find(|ppp_x: &&&u32| please(**ppp_x)).is_none();
+ let _ = [String::from("Hey hey")].iter().find(|s| s.len() == 2).is_none();
+
+ let v = vec![3, 2, 1, 0];
+ let _ = v.iter().find(|x| deref_enough(**x)).is_none();
+ let _ = v.iter().find(|x: &&u32| deref_enough(**x)).is_none();
+
+ #[allow(clippy::redundant_closure)]
+ let _ = v.iter().find(|x| arg_no_deref(x)).is_none();
+ #[allow(clippy::redundant_closure)]
+ let _ = v.iter().find(|x: &&u32| arg_no_deref(x)).is_none();
+ }
+
+ fn field_index_projection() {
+ struct FooDouble {
+ bar: Vec<Vec<i32>>,
+ }
+ struct Foo {
+ bar: Vec<i32>,
+ }
+ struct FooOuter {
+ inner: Foo,
+ inner_double: FooDouble,
+ }
+ let vfoo = vec![FooOuter {
+ inner: Foo { bar: vec![0, 1, 2, 3] },
+ inner_double: FooDouble {
+ bar: vec![vec![0, 1, 2, 3]],
+ },
+ }];
+ let _ = vfoo
+ .iter()
+ .find(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2)
+ .is_none();
+ }
+
+ fn index_field_projection() {
+ struct Foo {
+ bar: i32,
+ }
+ struct FooOuter {
+ inner: Vec<Foo>,
+ }
+ let vfoo = vec![FooOuter {
+ inner: vec![Foo { bar: 0 }],
+ }];
+ let _ = vfoo.iter().find(|v| v.inner[0].bar == 2).is_none();
+ }
+
+ fn double_deref_index_projection() {
+ let vfoo = vec![&&[0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|x| (**x)[0] == 9).is_none();
+ }
+
+ fn method_call_by_ref() {
+ struct Foo {
+ bar: u32,
+ }
+ impl Foo {
+ pub fn by_ref(&self, x: &u32) -> bool {
+ *x == self.bar
+ }
+ }
+ let vfoo = vec![Foo { bar: 1 }];
+ let _ = vfoo.iter().find(|v| v.by_ref(&v.bar)).is_none();
+ }
+
+ fn ref_bindings() {
+ let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|(&x, y)| x == *y).is_none();
+ let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_none();
+ }
+
++ fn test_string_1(s: &str) -> bool {
+ s.is_empty()
+ }
+
+ fn test_u32_1(s: &u32) -> bool {
+ s.is_power_of_two()
+ }
+
+ fn test_u32_2(s: u32) -> bool {
+ s.is_power_of_two()
+ }
+
+ fn projection_in_args_test() {
+ // Index projections
+ let lst = &[String::from("Hello"), String::from("world")];
+ let v: Vec<&[String]> = vec![lst];
+ let _ = v.iter().find(|s| s[0].is_empty()).is_none();
+ let _ = v.iter().find(|s| test_string_1(&s[0])).is_none();
+
+ // Field projections
+ struct FieldProjection<'a> {
+ field: &'a u32,
+ }
+ let field = 123456789;
+ let instance = FieldProjection { field: &field };
+ let v = vec![instance];
+ let _ = v.iter().find(|fp| fp.field.is_power_of_two()).is_none();
+ let _ = v.iter().find(|fp| test_u32_1(fp.field)).is_none();
+ let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_none();
+ }
+}
--- /dev/null
- error: writing `&String` instead of `&str` involves a new object where a slice will do
- --> $DIR/search_is_some_fixable_none.rs:192:25
- |
- LL | fn test_string_1(s: &String) -> bool {
- | ^^^^^^^ help: change this to: `&str`
- |
- = note: `-D clippy::ptr-arg` implied by `-D warnings`
-
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:10:13
+ |
+LL | let _ = v.iter().find(|&x| *x < 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x| *x < 0)`
+ |
+ = note: `-D clippy::search-is-some` implied by `-D warnings`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:11:13
+ |
+LL | let _ = (0..1).find(|x| **y == *x).is_none(); // one dereference less
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(0..1).any(|x| **y == x)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:12:13
+ |
+LL | let _ = (0..1).find(|x| *x == 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(0..1).any(|x| x == 0)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:13:13
+ |
+LL | let _ = v.iter().find(|x| **x == 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x| *x == 0)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:14:13
+ |
+LL | let _ = (4..5).find(|x| *x == 1 || *x == 3 || *x == 5).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(4..5).any(|x| x == 1 || x == 3 || x == 5)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:15:13
+ |
+LL | let _ = (1..3).find(|x| [1, 2, 3].contains(x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(1..3).any(|x| [1, 2, 3].contains(&x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:16:13
+ |
+LL | let _ = (1..3).find(|x| *x == 0 || [1, 2, 3].contains(x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(1..3).any(|x| x == 0 || [1, 2, 3].contains(&x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:17:13
+ |
+LL | let _ = (1..3).find(|x| [1, 2, 3].contains(x) || *x == 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!(1..3).any(|x| [1, 2, 3].contains(&x) || x == 0)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:18:13
+ |
+LL | let _ = (1..3)
+ | _____________^
+LL | | .find(|x| [1, 2, 3].contains(x) || *x == 0 || [4, 5, 6].contains(x) || *x == -1)
+LL | | .is_none();
+ | |__________________^ help: use `!_.any()` instead: `!(1..3).any(|x| [1, 2, 3].contains(&x) || x == 0 || [4, 5, 6].contains(&x) || x == -1)`
+
+error: called `is_none()` after searching an `Iterator` with `position`
+ --> $DIR/search_is_some_fixable_none.rs:23:13
+ |
+LL | let _ = v.iter().position(|&x| x < 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|&x| x < 0)`
+
+error: called `is_none()` after searching an `Iterator` with `rposition`
+ --> $DIR/search_is_some_fixable_none.rs:26:13
+ |
+LL | let _ = v.iter().rposition(|&x| x < 0).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|&x| x < 0)`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:32:13
+ |
+LL | let _ = "hello world".find("world").is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!"hello world".contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:33:13
+ |
+LL | let _ = "hello world".find(&s2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!"hello world".contains(&s2)`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:34:13
+ |
+LL | let _ = "hello world".find(&s2[2..]).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!"hello world".contains(&s2[2..])`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:36:13
+ |
+LL | let _ = s1.find("world").is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1.contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:37:13
+ |
+LL | let _ = s1.find(&s2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1.contains(&s2)`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:38:13
+ |
+LL | let _ = s1.find(&s2[2..]).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1.contains(&s2[2..])`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:40:13
+ |
+LL | let _ = s1[2..].find("world").is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1[2..].contains("world")`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:41:13
+ |
+LL | let _ = s1[2..].find(&s2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1[2..].contains(&s2)`
+
+error: called `is_none()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_none.rs:42:13
+ |
+LL | let _ = s1[2..].find(&s2[2..]).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.contains()` instead: `!s1[2..].contains(&s2[2..])`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:58:25
+ |
+LL | .filter(|c| filter_hand.iter().find(|cc| c == cc).is_none())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!filter_hand.iter().any(|cc| c == &cc)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:74:30
+ |
+LL | .filter(|(c, _)| filter_hand.iter().find(|cc| c == *cc).is_none())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!filter_hand.iter().any(|cc| c == cc)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:85:17
+ |
+LL | let _ = vfoo.iter().find(|v| v.foo == 1 && v.bar == 2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|v| v.foo == 1 && v.bar == 2)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:88:17
+ |
+LL | let _ = vfoo
+ | _________________^
+LL | | .iter()
+LL | | .find(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2)
+LL | | .is_none();
+ | |______________________^
+ |
+help: use `!_.any()` instead
+ |
+LL ~ let _ = !vfoo
+LL ~ .iter().any(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2);
+ |
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:96:17
+ |
+LL | let _ = vfoo.iter().find(|a| a[0] == 42).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|a| a[0] == 42)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:102:17
+ |
+LL | let _ = vfoo.iter().find(|sub| sub[1..4].len() == 3).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|sub| sub[1..4].len() == 3)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:120:17
+ |
+LL | let _ = [ppx].iter().find(|ppp_x: &&&u32| please(**ppp_x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `![ppx].iter().any(|ppp_x: &&u32| please(ppp_x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:121:17
+ |
+LL | let _ = [String::from("Hey hey")].iter().find(|s| s.len() == 2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `![String::from("Hey hey")].iter().any(|s| s.len() == 2)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:124:17
+ |
+LL | let _ = v.iter().find(|x| deref_enough(**x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x| deref_enough(*x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:125:17
+ |
+LL | let _ = v.iter().find(|x: &&u32| deref_enough(**x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x: &u32| deref_enough(*x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:128:17
+ |
+LL | let _ = v.iter().find(|x| arg_no_deref(x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x| arg_no_deref(&x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:130:17
+ |
+LL | let _ = v.iter().find(|x: &&u32| arg_no_deref(x)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|x: &u32| arg_no_deref(&x))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:150:17
+ |
+LL | let _ = vfoo
+ | _________________^
+LL | | .iter()
+LL | | .find(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2)
+LL | | .is_none();
+ | |______________________^
+ |
+help: use `!_.any()` instead
+ |
+LL ~ let _ = !vfoo
+LL ~ .iter().any(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2);
+ |
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:166:17
+ |
+LL | let _ = vfoo.iter().find(|v| v.inner[0].bar == 2).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|v| v.inner[0].bar == 2)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:171:17
+ |
+LL | let _ = vfoo.iter().find(|x| (**x)[0] == 9).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|x| (**x)[0] == 9)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:184:17
+ |
+LL | let _ = vfoo.iter().find(|v| v.by_ref(&v.bar)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!vfoo.iter().any(|v| v.by_ref(&v.bar))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:188:17
+ |
+LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|(&x, y)| x == *y).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `![&(&1, 2), &(&3, 4), &(&5, 4)].iter().any(|(&x, y)| x == *y)`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:189:17
+ |
+LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `![&(&1, 2), &(&3, 4), &(&5, 4)].iter().any(|(&x, y)| x == *y)`
+
- error: aborting due to 44 previous errors
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:208:17
+ |
+LL | let _ = v.iter().find(|s| s[0].is_empty()).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|s| s[0].is_empty())`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:209:17
+ |
+LL | let _ = v.iter().find(|s| test_string_1(&s[0])).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|s| test_string_1(&s[0]))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:218:17
+ |
+LL | let _ = v.iter().find(|fp| fp.field.is_power_of_two()).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|fp| fp.field.is_power_of_two())`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:219:17
+ |
+LL | let _ = v.iter().find(|fp| test_u32_1(fp.field)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|fp| test_u32_1(fp.field))`
+
+error: called `is_none()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_none.rs:220:17
+ |
+LL | let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_none();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|fp| test_u32_2(*fp.field))`
+
++error: aborting due to 43 previous errors
+
--- /dev/null
- fn test_string_1(s: &String) -> bool {
+// run-rustfix
+#![allow(dead_code)]
+#![warn(clippy::search_is_some)]
+
+fn main() {
+ let v = vec![3, 2, 1, 0, -1, -2, -3];
+ let y = &&42;
+
+ // Check `find().is_some()`, single-line case.
+ let _ = v.iter().find(|&x| *x < 0).is_some();
+ let _ = (0..1).find(|x| **y == *x).is_some(); // one dereference less
+ let _ = (0..1).find(|x| *x == 0).is_some();
+ let _ = v.iter().find(|x| **x == 0).is_some();
+ let _ = (4..5).find(|x| *x == 1 || *x == 3 || *x == 5).is_some();
+ let _ = (1..3).find(|x| [1, 2, 3].contains(x)).is_some();
+ let _ = (1..3).find(|x| *x == 0 || [1, 2, 3].contains(x)).is_some();
+ let _ = (1..3).find(|x| [1, 2, 3].contains(x) || *x == 0).is_some();
+ let _ = (1..3)
+ .find(|x| [1, 2, 3].contains(x) || *x == 0 || [4, 5, 6].contains(x) || *x == -1)
+ .is_some();
+
+ // Check `position().is_some()`, single-line case.
+ let _ = v.iter().position(|&x| x < 0).is_some();
+
+ // Check `rposition().is_some()`, single-line case.
+ let _ = v.iter().rposition(|&x| x < 0).is_some();
+
+ let s1 = String::from("hello world");
+ let s2 = String::from("world");
+ // caller of `find()` is a `&`static str`
+ let _ = "hello world".find("world").is_some();
+ let _ = "hello world".find(&s2).is_some();
+ let _ = "hello world".find(&s2[2..]).is_some();
+ // caller of `find()` is a `String`
+ let _ = s1.find("world").is_some();
+ let _ = s1.find(&s2).is_some();
+ let _ = s1.find(&s2[2..]).is_some();
+ // caller of `find()` is slice of `String`
+ let _ = s1[2..].find("world").is_some();
+ let _ = s1[2..].find(&s2).is_some();
+ let _ = s1[2..].find(&s2[2..]).is_some();
+}
+
+#[allow(clippy::clone_on_copy, clippy::map_clone)]
+mod issue7392 {
+ struct Player {
+ hand: Vec<usize>,
+ }
+ fn filter() {
+ let p = Player {
+ hand: vec![1, 2, 3, 4, 5],
+ };
+ let filter_hand = vec![5];
+ let _ = p
+ .hand
+ .iter()
+ .filter(|c| filter_hand.iter().find(|cc| c == cc).is_some())
+ .map(|c| c.clone())
+ .collect::<Vec<_>>();
+ }
+
+ struct PlayerTuple {
+ hand: Vec<(usize, char)>,
+ }
+ fn filter_tuple() {
+ let p = PlayerTuple {
+ hand: vec![(1, 'a'), (2, 'b'), (3, 'c'), (4, 'd'), (5, 'e')],
+ };
+ let filter_hand = vec![5];
+ let _ = p
+ .hand
+ .iter()
+ .filter(|(c, _)| filter_hand.iter().find(|cc| c == *cc).is_some())
+ .map(|c| c.clone())
+ .collect::<Vec<_>>();
+ }
+
+ fn field_projection() {
+ struct Foo {
+ foo: i32,
+ bar: u32,
+ }
+ let vfoo = vec![Foo { foo: 1, bar: 2 }];
+ let _ = vfoo.iter().find(|v| v.foo == 1 && v.bar == 2).is_some();
+
+ let vfoo = vec![(42, Foo { foo: 1, bar: 2 })];
+ let _ = vfoo
+ .iter()
+ .find(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2)
+ .is_some();
+ }
+
+ fn index_projection() {
+ let vfoo = vec![[0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|a| a[0] == 42).is_some();
+ }
+
+ #[allow(clippy::match_like_matches_macro)]
+ fn slice_projection() {
+ let vfoo = vec![[0, 1, 2, 3, 0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|sub| sub[1..4].len() == 3).is_some();
+ }
+
+ fn please(x: &u32) -> bool {
+ *x == 9
+ }
+
+ fn deref_enough(x: u32) -> bool {
+ x == 78
+ }
+
+ fn arg_no_deref(x: &&u32) -> bool {
+ **x == 78
+ }
+
+ fn more_projections() {
+ let x = 19;
+ let ppx: &u32 = &x;
+ let _ = [ppx].iter().find(|ppp_x: &&&u32| please(**ppp_x)).is_some();
+ let _ = [String::from("Hey hey")].iter().find(|s| s.len() == 2).is_some();
+
+ let v = vec![3, 2, 1, 0];
+ let _ = v.iter().find(|x| deref_enough(**x)).is_some();
+ let _ = v.iter().find(|x: &&u32| deref_enough(**x)).is_some();
+
+ #[allow(clippy::redundant_closure)]
+ let _ = v.iter().find(|x| arg_no_deref(x)).is_some();
+ #[allow(clippy::redundant_closure)]
+ let _ = v.iter().find(|x: &&u32| arg_no_deref(x)).is_some();
+ }
+
+ fn field_index_projection() {
+ struct FooDouble {
+ bar: Vec<Vec<i32>>,
+ }
+ struct Foo {
+ bar: Vec<i32>,
+ }
+ struct FooOuter {
+ inner: Foo,
+ inner_double: FooDouble,
+ }
+ let vfoo = vec![FooOuter {
+ inner: Foo { bar: vec![0, 1, 2, 3] },
+ inner_double: FooDouble {
+ bar: vec![vec![0, 1, 2, 3]],
+ },
+ }];
+ let _ = vfoo
+ .iter()
+ .find(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2)
+ .is_some();
+ }
+
+ fn index_field_projection() {
+ struct Foo {
+ bar: i32,
+ }
+ struct FooOuter {
+ inner: Vec<Foo>,
+ }
+ let vfoo = vec![FooOuter {
+ inner: vec![Foo { bar: 0 }],
+ }];
+ let _ = vfoo.iter().find(|v| v.inner[0].bar == 2).is_some();
+ }
+
+ fn double_deref_index_projection() {
+ let vfoo = vec![&&[0, 1, 2, 3]];
+ let _ = vfoo.iter().find(|x| (**x)[0] == 9).is_some();
+ }
+
+ fn method_call_by_ref() {
+ struct Foo {
+ bar: u32,
+ }
+ impl Foo {
+ pub fn by_ref(&self, x: &u32) -> bool {
+ *x == self.bar
+ }
+ }
+ let vfoo = vec![Foo { bar: 1 }];
+ let _ = vfoo.iter().find(|v| v.by_ref(&v.bar)).is_some();
+ }
+
+ fn ref_bindings() {
+ let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|(&x, y)| x == *y).is_some();
+ let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_some();
+ }
+
++ fn test_string_1(s: &str) -> bool {
+ s.is_empty()
+ }
+
+ fn test_u32_1(s: &u32) -> bool {
+ s.is_power_of_two()
+ }
+
+ fn test_u32_2(s: u32) -> bool {
+ s.is_power_of_two()
+ }
+
+ fn projection_in_args_test() {
+ // Index projections
+ let lst = &[String::from("Hello"), String::from("world")];
+ let v: Vec<&[String]> = vec![lst];
+ let _ = v.iter().find(|s| s[0].is_empty()).is_some();
+ let _ = v.iter().find(|s| test_string_1(&s[0])).is_some();
+
+ // Field projections
+ struct FieldProjection<'a> {
+ field: &'a u32,
+ }
+ let field = 123456789;
+ let instance = FieldProjection { field: &field };
+ let v = vec![instance];
+ let _ = v.iter().find(|fp| fp.field.is_power_of_two()).is_some();
+ let _ = v.iter().find(|fp| test_u32_1(fp.field)).is_some();
+ let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_some();
+ }
+}
--- /dev/null
- error: writing `&String` instead of `&str` involves a new object where a slice will do
- --> $DIR/search_is_some_fixable_some.rs:191:25
- |
- LL | fn test_string_1(s: &String) -> bool {
- | ^^^^^^^ help: change this to: `&str`
- |
- = note: `-D clippy::ptr-arg` implied by `-D warnings`
-
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:10:22
+ |
+LL | let _ = v.iter().find(|&x| *x < 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| *x < 0)`
+ |
+ = note: `-D clippy::search-is-some` implied by `-D warnings`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:11:20
+ |
+LL | let _ = (0..1).find(|x| **y == *x).is_some(); // one dereference less
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| **y == x)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:12:20
+ |
+LL | let _ = (0..1).find(|x| *x == 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| x == 0)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:13:22
+ |
+LL | let _ = v.iter().find(|x| **x == 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| *x == 0)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:14:20
+ |
+LL | let _ = (4..5).find(|x| *x == 1 || *x == 3 || *x == 5).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| x == 1 || x == 3 || x == 5)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:15:20
+ |
+LL | let _ = (1..3).find(|x| [1, 2, 3].contains(x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| [1, 2, 3].contains(&x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:16:20
+ |
+LL | let _ = (1..3).find(|x| *x == 0 || [1, 2, 3].contains(x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| x == 0 || [1, 2, 3].contains(&x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:17:20
+ |
+LL | let _ = (1..3).find(|x| [1, 2, 3].contains(x) || *x == 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| [1, 2, 3].contains(&x) || x == 0)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:19:10
+ |
+LL | .find(|x| [1, 2, 3].contains(x) || *x == 0 || [4, 5, 6].contains(x) || *x == -1)
+ | __________^
+LL | | .is_some();
+ | |__________________^ help: use `any()` instead: `any(|x| [1, 2, 3].contains(&x) || x == 0 || [4, 5, 6].contains(&x) || x == -1)`
+
+error: called `is_some()` after searching an `Iterator` with `position`
+ --> $DIR/search_is_some_fixable_some.rs:23:22
+ |
+LL | let _ = v.iter().position(|&x| x < 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|&x| x < 0)`
+
+error: called `is_some()` after searching an `Iterator` with `rposition`
+ --> $DIR/search_is_some_fixable_some.rs:26:22
+ |
+LL | let _ = v.iter().rposition(|&x| x < 0).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|&x| x < 0)`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:31:27
+ |
+LL | let _ = "hello world".find("world").is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains("world")`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:32:27
+ |
+LL | let _ = "hello world".find(&s2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2)`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:33:27
+ |
+LL | let _ = "hello world".find(&s2[2..]).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2[2..])`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:35:16
+ |
+LL | let _ = s1.find("world").is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains("world")`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:36:16
+ |
+LL | let _ = s1.find(&s2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2)`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:37:16
+ |
+LL | let _ = s1.find(&s2[2..]).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2[2..])`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:39:21
+ |
+LL | let _ = s1[2..].find("world").is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains("world")`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:40:21
+ |
+LL | let _ = s1[2..].find(&s2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2)`
+
+error: called `is_some()` after calling `find()` on a string
+ --> $DIR/search_is_some_fixable_some.rs:41:21
+ |
+LL | let _ = s1[2..].find(&s2[2..]).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `contains()` instead: `contains(&s2[2..])`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:57:44
+ |
+LL | .filter(|c| filter_hand.iter().find(|cc| c == cc).is_some())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|cc| c == &cc)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:73:49
+ |
+LL | .filter(|(c, _)| filter_hand.iter().find(|cc| c == *cc).is_some())
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|cc| c == cc)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:84:29
+ |
+LL | let _ = vfoo.iter().find(|v| v.foo == 1 && v.bar == 2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|v| v.foo == 1 && v.bar == 2)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:89:14
+ |
+LL | .find(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2)
+ | ______________^
+LL | | .is_some();
+ | |______________________^ help: use `any()` instead: `any(|(i, v)| *i == 42 && v.foo == 1 && v.bar == 2)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:95:29
+ |
+LL | let _ = vfoo.iter().find(|a| a[0] == 42).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|a| a[0] == 42)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:101:29
+ |
+LL | let _ = vfoo.iter().find(|sub| sub[1..4].len() == 3).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|sub| sub[1..4].len() == 3)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:119:30
+ |
+LL | let _ = [ppx].iter().find(|ppp_x: &&&u32| please(**ppp_x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|ppp_x: &&u32| please(ppp_x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:120:50
+ |
+LL | let _ = [String::from("Hey hey")].iter().find(|s| s.len() == 2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|s| s.len() == 2)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:123:26
+ |
+LL | let _ = v.iter().find(|x| deref_enough(**x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| deref_enough(*x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:124:26
+ |
+LL | let _ = v.iter().find(|x: &&u32| deref_enough(**x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x: &u32| deref_enough(*x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:127:26
+ |
+LL | let _ = v.iter().find(|x| arg_no_deref(x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| arg_no_deref(&x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:129:26
+ |
+LL | let _ = v.iter().find(|x: &&u32| arg_no_deref(x)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x: &u32| arg_no_deref(&x))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:151:14
+ |
+LL | .find(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2)
+ | ______________^
+LL | | .is_some();
+ | |______________________^ help: use `any()` instead: `any(|v| v.inner_double.bar[0][0] == 2 && v.inner.bar[0] == 2)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:165:29
+ |
+LL | let _ = vfoo.iter().find(|v| v.inner[0].bar == 2).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|v| v.inner[0].bar == 2)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:170:29
+ |
+LL | let _ = vfoo.iter().find(|x| (**x)[0] == 9).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|x| (**x)[0] == 9)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:183:29
+ |
+LL | let _ = vfoo.iter().find(|v| v.by_ref(&v.bar)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|v| v.by_ref(&v.bar))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:187:55
+ |
+LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|(&x, y)| x == *y).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|(&x, y)| x == *y)`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:188:55
+ |
+LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|(&x, y)| x == *y)`
+
- error: aborting due to 44 previous errors
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:207:26
+ |
+LL | let _ = v.iter().find(|s| s[0].is_empty()).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|s| s[0].is_empty())`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:208:26
+ |
+LL | let _ = v.iter().find(|s| test_string_1(&s[0])).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|s| test_string_1(&s[0]))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:217:26
+ |
+LL | let _ = v.iter().find(|fp| fp.field.is_power_of_two()).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|fp| fp.field.is_power_of_two())`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:218:26
+ |
+LL | let _ = v.iter().find(|fp| test_u32_1(fp.field)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|fp| test_u32_1(fp.field))`
+
+error: called `is_some()` after searching an `Iterator` with `find`
+ --> $DIR/search_is_some_fixable_some.rs:219:26
+ |
+LL | let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_some();
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|fp| test_u32_2(*fp.field))`
+
++error: aborting due to 43 previous errors
+
--- /dev/null
- fn do_stuff(vec: &mut Vec<u8>) {}
+use std::iter::repeat;
+
+fn main() {
+ resize_vector();
+ extend_vector();
+ mixed_extend_resize_vector();
+}
+
+fn extend_vector() {
+ // Extend with constant expression
+ let len = 300;
+ let mut vec1 = Vec::with_capacity(len);
+ vec1.extend(repeat(0).take(len));
+
+ // Extend with len expression
+ let mut vec2 = Vec::with_capacity(len - 10);
+ vec2.extend(repeat(0).take(len - 10));
+
+ // Extend with mismatching expression should not be warned
+ let mut vec3 = Vec::with_capacity(24322);
+ vec3.extend(repeat(0).take(2));
+}
+
+fn mixed_extend_resize_vector() {
+ // Mismatching len
+ let mut mismatching_len = Vec::with_capacity(30);
+ mismatching_len.extend(repeat(0).take(40));
+
+ // Slow initialization
+ let mut resized_vec = Vec::with_capacity(30);
+ resized_vec.resize(30, 0);
+
+ let mut extend_vec = Vec::with_capacity(30);
+ extend_vec.extend(repeat(0).take(30));
+}
+
+fn resize_vector() {
+ // Resize with constant expression
+ let len = 300;
+ let mut vec1 = Vec::with_capacity(len);
+ vec1.resize(len, 0);
+
+ // Resize mismatch len
+ let mut vec2 = Vec::with_capacity(200);
+ vec2.resize(10, 0);
+
+ // Resize with len expression
+ let mut vec3 = Vec::with_capacity(len - 10);
+ vec3.resize(len - 10, 0);
+
+ // Reinitialization should be warned
+ vec1 = Vec::with_capacity(10);
+ vec1.resize(10, 0);
+}
+
++fn do_stuff(vec: &mut [u8]) {}
+
+fn extend_vector_with_manipulations_between() {
+ let len = 300;
+ let mut vec1: Vec<u8> = Vec::with_capacity(len);
+ do_stuff(&mut vec1);
+ vec1.extend(repeat(0).take(len));
+}
--- /dev/null
+#![deny(clippy::trait_duplication_in_bounds)]
+
++use std::collections::BTreeMap;
+use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};
+
+fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
+where
+ T: Clone,
+ T: Default,
+{
+ unimplemented!();
+}
+
+fn good_bar<T: Clone + Default>(arg: T) {
+ unimplemented!();
+}
+
+fn good_foo<T>(arg: T)
+where
+ T: Clone + Default,
+{
+ unimplemented!();
+}
+
+fn good_foobar<T: Default>(arg: T)
+where
+ T: Clone,
+{
+ unimplemented!();
+}
+
+trait T: Default {
+ fn f()
+ where
+ Self: Default;
+}
+
+trait U: Default {
+ fn f()
+ where
+ Self: Clone;
+}
+
+trait ZZ: Default {
+ fn g();
+ fn h();
+ fn f()
+ where
+ Self: Default + Clone;
+}
+
+trait BadTrait: Default + Clone {
+ fn f()
+ where
+ Self: Default + Clone;
+ fn g()
+ where
+ Self: Default;
+ fn h()
+ where
+ Self: Copy;
+}
+
+#[derive(Default, Clone)]
+struct Life {}
+
+impl T for Life {
+ // this should not warn
+ fn f() {}
+}
+
+impl U for Life {
+ // this should not warn
+ fn f() {}
+}
+
++// should not warn
++trait Iter: Iterator {
++ fn into_group_btreemap<K, V>(self) -> BTreeMap<K, Vec<V>>
++ where
++ Self: Iterator<Item = (K, V)> + Sized,
++ K: Ord + Eq,
++ {
++ unimplemented!();
++ }
++}
++
++struct Foo {}
++
++trait FooIter: Iterator<Item = Foo> {
++ fn bar()
++ where
++ Self: Iterator<Item = Foo>,
++ {
++ }
++}
++
+fn main() {}
--- /dev/null
- --> $DIR/trait_duplication_in_bounds.rs:5:15
+error: this trait bound is already specified in the where clause
- --> $DIR/trait_duplication_in_bounds.rs:5:23
++ --> $DIR/trait_duplication_in_bounds.rs:6:15
+ |
+LL | fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
+ | ^^^^^
+ |
+note: the lint level is defined here
+ --> $DIR/trait_duplication_in_bounds.rs:1:9
+ |
+LL | #![deny(clippy::trait_duplication_in_bounds)]
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in the where clause
- --> $DIR/trait_duplication_in_bounds.rs:34:15
++ --> $DIR/trait_duplication_in_bounds.rs:6:23
+ |
+LL | fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
+ | ^^^^^^^
+ |
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in trait declaration
- --> $DIR/trait_duplication_in_bounds.rs:48:15
++ --> $DIR/trait_duplication_in_bounds.rs:35:15
+ |
+LL | Self: Default;
+ | ^^^^^^^
+ |
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in trait declaration
- --> $DIR/trait_duplication_in_bounds.rs:54:15
++ --> $DIR/trait_duplication_in_bounds.rs:49:15
+ |
+LL | Self: Default + Clone;
+ | ^^^^^^^
+ |
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in trait declaration
- --> $DIR/trait_duplication_in_bounds.rs:54:25
++ --> $DIR/trait_duplication_in_bounds.rs:55:15
+ |
+LL | Self: Default + Clone;
+ | ^^^^^^^
+ |
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in trait declaration
- --> $DIR/trait_duplication_in_bounds.rs:57:15
++ --> $DIR/trait_duplication_in_bounds.rs:55:25
+ |
+LL | Self: Default + Clone;
+ | ^^^^^
+ |
+ = help: consider removing this trait bound
+
+error: this trait bound is already specified in trait declaration
- error: aborting due to 7 previous errors
++ --> $DIR/trait_duplication_in_bounds.rs:58:15
+ |
+LL | Self: Default;
+ | ^^^^^^^
+ |
+ = help: consider removing this trait bound
+
++error: this trait bound is already specified in trait declaration
++ --> $DIR/trait_duplication_in_bounds.rs:93:15
++ |
++LL | Self: Iterator<Item = Foo>,
++ | ^^^^^^^^^^^^^^^^^^^^
++ |
++ = help: consider removing this trait bound
++
++error: aborting due to 8 previous errors
+
--- /dev/null
+#![warn(clippy::unnecessary_cast)]
+#![allow(clippy::no_effect)]
+
++#[rustfmt::skip]
+fn main() {
+ // Test cast_unnecessary
+ 1i32 as i32;
+ 1f32 as f32;
+ false as bool;
+ &1i32 as &i32;
+
++ -1_i32 as i32;
++ - 1_i32 as i32;
++ -1f32 as f32;
++ 1_i32 as i32;
++ 1_f32 as f32;
++
+ // macro version
+ macro_rules! foo {
+ ($a:ident, $b:ident) => {
+ #[allow(unused)]
+ pub fn $a() -> $b {
+ 1 as $b
+ }
+ };
+ }
+ foo!(a, i32);
+ foo!(b, f32);
+ foo!(c, f64);
+
+ // do not lint cast to cfg-dependant type
+ 1 as std::os::raw::c_char;
+}
--- /dev/null
- --> $DIR/unnecessary_cast.rs:6:5
+error: casting integer literal to `i32` is unnecessary
- --> $DIR/unnecessary_cast.rs:7:5
++ --> $DIR/unnecessary_cast.rs:7:5
+ |
+LL | 1i32 as i32;
+ | ^^^^^^^^^^^ help: try: `1_i32`
+ |
+ = note: `-D clippy::unnecessary-cast` implied by `-D warnings`
+
+error: casting float literal to `f32` is unnecessary
- --> $DIR/unnecessary_cast.rs:8:5
++ --> $DIR/unnecessary_cast.rs:8:5
+ |
+LL | 1f32 as f32;
+ | ^^^^^^^^^^^ help: try: `1_f32`
+
+error: casting to the same type is unnecessary (`bool` -> `bool`)
- error: aborting due to 3 previous errors
++ --> $DIR/unnecessary_cast.rs:9:5
+ |
+LL | false as bool;
+ | ^^^^^^^^^^^^^ help: try: `false`
+
++error: casting integer literal to `i32` is unnecessary
++ --> $DIR/unnecessary_cast.rs:12:5
++ |
++LL | -1_i32 as i32;
++ | ^^^^^^^^^^^^^ help: try: `-1_i32`
++
++error: casting integer literal to `i32` is unnecessary
++ --> $DIR/unnecessary_cast.rs:13:5
++ |
++LL | - 1_i32 as i32;
++ | ^^^^^^^^^^^^^^ help: try: `- 1_i32`
++
++error: casting float literal to `f32` is unnecessary
++ --> $DIR/unnecessary_cast.rs:14:5
++ |
++LL | -1f32 as f32;
++ | ^^^^^^^^^^^^ help: try: `-1_f32`
++
++error: casting integer literal to `i32` is unnecessary
++ --> $DIR/unnecessary_cast.rs:15:5
++ |
++LL | 1_i32 as i32;
++ | ^^^^^^^^^^^^ help: try: `1_i32`
++
++error: casting float literal to `f32` is unnecessary
++ --> $DIR/unnecessary_cast.rs:16:5
++ |
++LL | 1_f32 as f32;
++ | ^^^^^^^^^^^^ help: try: `1_f32`
++
++error: aborting due to 8 previous errors
+
--- /dev/null
- #[allow(unused_parens, clippy::double_parens)]
+// run-rustfix
+
+#![deny(clippy::useless_asref)]
+
+use std::fmt::Debug;
+
+struct FakeAsRef;
+
+#[allow(clippy::should_implement_trait)]
+impl FakeAsRef {
+ fn as_ref(&self) -> &Self {
+ self
+ }
+}
+
+struct MoreRef;
+
+impl<'a, 'b, 'c> AsRef<&'a &'b &'c MoreRef> for MoreRef {
+ fn as_ref(&self) -> &&'a &'b &'c MoreRef {
+ &&&&MoreRef
+ }
+}
+
+fn foo_rstr(x: &str) {
+ println!("{:?}", x);
+}
+fn foo_rslice(x: &[i32]) {
+ println!("{:?}", x);
+}
+fn foo_mrslice(x: &mut [i32]) {
+ println!("{:?}", x);
+}
+fn foo_rrrrmr(_: &&&&MoreRef) {
+ println!("so many refs");
+}
+
+fn not_ok() {
+ let rstr: &str = "hello";
+ let mut mrslice: &mut [i32] = &mut [1, 2, 3];
+
+ {
+ let rslice: &[i32] = &*mrslice;
+ foo_rstr(rstr);
+ foo_rstr(rstr);
+ foo_rslice(rslice);
+ foo_rslice(rslice);
+ }
+ {
+ foo_mrslice(mrslice);
+ foo_mrslice(mrslice);
+ foo_rslice(mrslice);
+ foo_rslice(mrslice);
+ }
+
+ {
+ let rrrrrstr = &&&&rstr;
+ let rrrrrslice = &&&&&*mrslice;
+ foo_rslice(rrrrrslice);
+ foo_rslice(rrrrrslice);
+ foo_rstr(rrrrrstr);
+ foo_rstr(rrrrrstr);
+ }
+ {
+ let mrrrrrslice = &mut &mut &mut &mut mrslice;
+ foo_mrslice(mrrrrrslice);
+ foo_mrslice(mrrrrrslice);
+ foo_rslice(mrrrrrslice);
+ foo_rslice(mrrrrrslice);
+ }
++ #[allow(unused_parens, clippy::double_parens, clippy::needless_borrow)]
+ foo_rrrrmr((&&&&MoreRef));
+
+ generic_not_ok(mrslice);
+ generic_ok(mrslice);
+}
+
+fn ok() {
+ let string = "hello".to_owned();
+ let mut arr = [1, 2, 3];
+ let mut vec = vec![1, 2, 3];
+
+ {
+ foo_rstr(string.as_ref());
+ foo_rslice(arr.as_ref());
+ foo_rslice(vec.as_ref());
+ }
+ {
+ foo_mrslice(arr.as_mut());
+ foo_mrslice(vec.as_mut());
+ }
+
+ {
+ let rrrrstring = &&&&string;
+ let rrrrarr = &&&&arr;
+ let rrrrvec = &&&&vec;
+ foo_rstr(rrrrstring.as_ref());
+ foo_rslice(rrrrarr.as_ref());
+ foo_rslice(rrrrvec.as_ref());
+ }
+ {
+ let mrrrrarr = &mut &mut &mut &mut arr;
+ let mrrrrvec = &mut &mut &mut &mut vec;
+ foo_mrslice(mrrrrarr.as_mut());
+ foo_mrslice(mrrrrvec.as_mut());
+ }
+ FakeAsRef.as_ref();
+ foo_rrrrmr(MoreRef.as_ref());
+
+ generic_not_ok(arr.as_mut());
+ generic_ok(&mut arr);
+}
+
+fn foo_mrt<T: Debug + ?Sized>(t: &mut T) {
+ println!("{:?}", t);
+}
+fn foo_rt<T: Debug + ?Sized>(t: &T) {
+ println!("{:?}", t);
+}
+
+fn generic_not_ok<T: AsMut<T> + AsRef<T> + Debug + ?Sized>(mrt: &mut T) {
+ foo_mrt(mrt);
+ foo_mrt(mrt);
+ foo_rt(mrt);
+ foo_rt(mrt);
+}
+
+fn generic_ok<U: AsMut<T> + AsRef<T> + ?Sized, T: Debug + ?Sized>(mru: &mut U) {
+ foo_mrt(mru.as_mut());
+ foo_rt(mru.as_ref());
+}
+
+fn main() {
+ not_ok();
+ ok();
+}
--- /dev/null
- #[allow(unused_parens, clippy::double_parens)]
+// run-rustfix
+
+#![deny(clippy::useless_asref)]
+
+use std::fmt::Debug;
+
+struct FakeAsRef;
+
+#[allow(clippy::should_implement_trait)]
+impl FakeAsRef {
+ fn as_ref(&self) -> &Self {
+ self
+ }
+}
+
+struct MoreRef;
+
+impl<'a, 'b, 'c> AsRef<&'a &'b &'c MoreRef> for MoreRef {
+ fn as_ref(&self) -> &&'a &'b &'c MoreRef {
+ &&&&MoreRef
+ }
+}
+
+fn foo_rstr(x: &str) {
+ println!("{:?}", x);
+}
+fn foo_rslice(x: &[i32]) {
+ println!("{:?}", x);
+}
+fn foo_mrslice(x: &mut [i32]) {
+ println!("{:?}", x);
+}
+fn foo_rrrrmr(_: &&&&MoreRef) {
+ println!("so many refs");
+}
+
+fn not_ok() {
+ let rstr: &str = "hello";
+ let mut mrslice: &mut [i32] = &mut [1, 2, 3];
+
+ {
+ let rslice: &[i32] = &*mrslice;
+ foo_rstr(rstr.as_ref());
+ foo_rstr(rstr);
+ foo_rslice(rslice.as_ref());
+ foo_rslice(rslice);
+ }
+ {
+ foo_mrslice(mrslice.as_mut());
+ foo_mrslice(mrslice);
+ foo_rslice(mrslice.as_ref());
+ foo_rslice(mrslice);
+ }
+
+ {
+ let rrrrrstr = &&&&rstr;
+ let rrrrrslice = &&&&&*mrslice;
+ foo_rslice(rrrrrslice.as_ref());
+ foo_rslice(rrrrrslice);
+ foo_rstr(rrrrrstr.as_ref());
+ foo_rstr(rrrrrstr);
+ }
+ {
+ let mrrrrrslice = &mut &mut &mut &mut mrslice;
+ foo_mrslice(mrrrrrslice.as_mut());
+ foo_mrslice(mrrrrrslice);
+ foo_rslice(mrrrrrslice.as_ref());
+ foo_rslice(mrrrrrslice);
+ }
++ #[allow(unused_parens, clippy::double_parens, clippy::needless_borrow)]
+ foo_rrrrmr((&&&&MoreRef).as_ref());
+
+ generic_not_ok(mrslice);
+ generic_ok(mrslice);
+}
+
+fn ok() {
+ let string = "hello".to_owned();
+ let mut arr = [1, 2, 3];
+ let mut vec = vec![1, 2, 3];
+
+ {
+ foo_rstr(string.as_ref());
+ foo_rslice(arr.as_ref());
+ foo_rslice(vec.as_ref());
+ }
+ {
+ foo_mrslice(arr.as_mut());
+ foo_mrslice(vec.as_mut());
+ }
+
+ {
+ let rrrrstring = &&&&string;
+ let rrrrarr = &&&&arr;
+ let rrrrvec = &&&&vec;
+ foo_rstr(rrrrstring.as_ref());
+ foo_rslice(rrrrarr.as_ref());
+ foo_rslice(rrrrvec.as_ref());
+ }
+ {
+ let mrrrrarr = &mut &mut &mut &mut arr;
+ let mrrrrvec = &mut &mut &mut &mut vec;
+ foo_mrslice(mrrrrarr.as_mut());
+ foo_mrslice(mrrrrvec.as_mut());
+ }
+ FakeAsRef.as_ref();
+ foo_rrrrmr(MoreRef.as_ref());
+
+ generic_not_ok(arr.as_mut());
+ generic_ok(&mut arr);
+}
+
+fn foo_mrt<T: Debug + ?Sized>(t: &mut T) {
+ println!("{:?}", t);
+}
+fn foo_rt<T: Debug + ?Sized>(t: &T) {
+ println!("{:?}", t);
+}
+
+fn generic_not_ok<T: AsMut<T> + AsRef<T> + Debug + ?Sized>(mrt: &mut T) {
+ foo_mrt(mrt.as_mut());
+ foo_mrt(mrt);
+ foo_rt(mrt.as_ref());
+ foo_rt(mrt);
+}
+
+fn generic_ok<U: AsMut<T> + AsRef<T> + ?Sized, T: Debug + ?Sized>(mru: &mut U) {
+ foo_mrt(mru.as_mut());
+ foo_rt(mru.as_ref());
+}
+
+fn main() {
+ not_ok();
+ ok();
+}
--- /dev/null
- write!(&mut v, "Hello");
- writeln!(&mut v, "Hello");
+#![allow(unused_must_use)]
+#![warn(clippy::write_literal)]
+
+use std::io::Write;
+
+fn main() {
+ let mut v = Vec::new();
+
+ // these should be fine
- writeln!(&mut v, "Hello {}", world);
- writeln!(&mut v, "Hello {world}", world = world);
- writeln!(&mut v, "3 in hex is {:X}", 3);
- writeln!(&mut v, "2 + 1 = {:.4}", 3);
- writeln!(&mut v, "2 + 1 = {:5.4}", 3);
- writeln!(&mut v, "Debug test {:?}", "hello, world");
- writeln!(&mut v, "{0:8} {1:>8}", "hello", "world");
- writeln!(&mut v, "{1:8} {0:>8}", "hello", "world");
- writeln!(&mut v, "{foo:8} {bar:>8}", foo = "hello", bar = "world");
- writeln!(&mut v, "{bar:8} {foo:>8}", foo = "hello", bar = "world");
- writeln!(&mut v, "{number:>width$}", number = 1, width = 6);
- writeln!(&mut v, "{number:>0width$}", number = 1, width = 6);
- writeln!(&mut v, "{} of {:b} people know binary, the other half doesn't", 1, 2);
- writeln!(&mut v, "10 / 4 is {}", 2.5);
- writeln!(&mut v, "2 + 1 = {}", 3);
++ write!(v, "Hello");
++ writeln!(v, "Hello");
+ let world = "world";
- write!(&mut v, "Hello {}", "world");
- writeln!(&mut v, "Hello {} {}", world, "world");
- writeln!(&mut v, "Hello {}", "world");
++ writeln!(v, "Hello {}", world);
++ writeln!(v, "Hello {world}", world = world);
++ writeln!(v, "3 in hex is {:X}", 3);
++ writeln!(v, "2 + 1 = {:.4}", 3);
++ writeln!(v, "2 + 1 = {:5.4}", 3);
++ writeln!(v, "Debug test {:?}", "hello, world");
++ writeln!(v, "{0:8} {1:>8}", "hello", "world");
++ writeln!(v, "{1:8} {0:>8}", "hello", "world");
++ writeln!(v, "{foo:8} {bar:>8}", foo = "hello", bar = "world");
++ writeln!(v, "{bar:8} {foo:>8}", foo = "hello", bar = "world");
++ writeln!(v, "{number:>width$}", number = 1, width = 6);
++ writeln!(v, "{number:>0width$}", number = 1, width = 6);
++ writeln!(v, "{} of {:b} people know binary, the other half doesn't", 1, 2);
++ writeln!(v, "10 / 4 is {}", 2.5);
++ writeln!(v, "2 + 1 = {}", 3);
+
+ // these should throw warnings
- writeln!(&mut v, "{0} {1}", "hello", "world");
- writeln!(&mut v, "{1} {0}", "hello", "world");
++ write!(v, "Hello {}", "world");
++ writeln!(v, "Hello {} {}", world, "world");
++ writeln!(v, "Hello {}", "world");
+
+ // positional args don't change the fact
+ // that we're using a literal -- this should
+ // throw a warning
- writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
- writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");
++ writeln!(v, "{0} {1}", "hello", "world");
++ writeln!(v, "{1} {0}", "hello", "world");
+
+ // named args shouldn't change anything either
++ writeln!(v, "{foo} {bar}", foo = "hello", bar = "world");
++ writeln!(v, "{bar} {foo}", foo = "hello", bar = "world");
+}
--- /dev/null
- --> $DIR/write_literal.rs:30:32
+error: literal with an empty format string
- LL | write!(&mut v, "Hello {}", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:30:27
+ |
- LL - write!(&mut v, "Hello {}", "world");
- LL + write!(&mut v, "Hello world");
++LL | write!(v, "Hello {}", "world");
++ | ^^^^^^^
+ |
+ = note: `-D clippy::write-literal` implied by `-D warnings`
+help: try this
+ |
- --> $DIR/write_literal.rs:31:44
++LL - write!(v, "Hello {}", "world");
++LL + write!(v, "Hello world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "Hello {} {}", world, "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:31:39
+ |
- LL - writeln!(&mut v, "Hello {} {}", world, "world");
- LL + writeln!(&mut v, "Hello {} world", world);
++LL | writeln!(v, "Hello {} {}", world, "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:32:34
++LL - writeln!(v, "Hello {} {}", world, "world");
++LL + writeln!(v, "Hello {} world", world);
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "Hello {}", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:32:29
+ |
- LL - writeln!(&mut v, "Hello {}", "world");
- LL + writeln!(&mut v, "Hello world");
++LL | writeln!(v, "Hello {}", "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:37:33
++LL - writeln!(v, "Hello {}", "world");
++LL + writeln!(v, "Hello world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{0} {1}", "hello", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:37:28
+ |
- LL - writeln!(&mut v, "{0} {1}", "hello", "world");
- LL + writeln!(&mut v, "hello {1}", "world");
++LL | writeln!(v, "{0} {1}", "hello", "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:37:42
++LL - writeln!(v, "{0} {1}", "hello", "world");
++LL + writeln!(v, "hello {1}", "world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{0} {1}", "hello", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:37:37
+ |
- LL - writeln!(&mut v, "{0} {1}", "hello", "world");
- LL + writeln!(&mut v, "{0} world", "hello");
++LL | writeln!(v, "{0} {1}", "hello", "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:38:33
++LL - writeln!(v, "{0} {1}", "hello", "world");
++LL + writeln!(v, "{0} world", "hello");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{1} {0}", "hello", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:38:28
+ |
- LL - writeln!(&mut v, "{1} {0}", "hello", "world");
- LL + writeln!(&mut v, "{1} hello", "world");
++LL | writeln!(v, "{1} {0}", "hello", "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:38:42
++LL - writeln!(v, "{1} {0}", "hello", "world");
++LL + writeln!(v, "{1} hello", "world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{1} {0}", "hello", "world");
- | ^^^^^^^
++ --> $DIR/write_literal.rs:38:37
+ |
- LL - writeln!(&mut v, "{1} {0}", "hello", "world");
- LL + writeln!(&mut v, "world {0}", "hello");
++LL | writeln!(v, "{1} {0}", "hello", "world");
++ | ^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:41:37
++LL - writeln!(v, "{1} {0}", "hello", "world");
++LL + writeln!(v, "world {0}", "hello");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
- | ^^^^^^^^^^^^^
++ --> $DIR/write_literal.rs:41:32
+ |
- LL - writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
- LL + writeln!(&mut v, "hello {bar}", bar = "world");
++LL | writeln!(v, "{foo} {bar}", foo = "hello", bar = "world");
++ | ^^^^^^^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:41:52
++LL - writeln!(v, "{foo} {bar}", foo = "hello", bar = "world");
++LL + writeln!(v, "hello {bar}", bar = "world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
- | ^^^^^^^^^^^^^
++ --> $DIR/write_literal.rs:41:47
+ |
- LL - writeln!(&mut v, "{foo} {bar}", foo = "hello", bar = "world");
- LL + writeln!(&mut v, "{foo} world", foo = "hello");
++LL | writeln!(v, "{foo} {bar}", foo = "hello", bar = "world");
++ | ^^^^^^^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:42:37
++LL - writeln!(v, "{foo} {bar}", foo = "hello", bar = "world");
++LL + writeln!(v, "{foo} world", foo = "hello");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");
- | ^^^^^^^^^^^^^
++ --> $DIR/write_literal.rs:42:32
+ |
- LL - writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");
- LL + writeln!(&mut v, "{bar} hello", bar = "world");
++LL | writeln!(v, "{bar} {foo}", foo = "hello", bar = "world");
++ | ^^^^^^^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal.rs:42:52
++LL - writeln!(v, "{bar} {foo}", foo = "hello", bar = "world");
++LL + writeln!(v, "{bar} hello", bar = "world");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");
- | ^^^^^^^^^^^^^
++ --> $DIR/write_literal.rs:42:47
+ |
- LL - writeln!(&mut v, "{bar} {foo}", foo = "hello", bar = "world");
- LL + writeln!(&mut v, "world {foo}", foo = "hello");
++LL | writeln!(v, "{bar} {foo}", foo = "hello", bar = "world");
++ | ^^^^^^^^^^^^^
+ |
+help: try this
+ |
++LL - writeln!(v, "{bar} {foo}", foo = "hello", bar = "world");
++LL + writeln!(v, "world {foo}", foo = "hello");
+ |
+
+error: aborting due to 11 previous errors
+
--- /dev/null
- writeln!(&mut v, "{}", "{hello}");
- writeln!(&mut v, r"{}", r"{hello}");
- writeln!(&mut v, "{}", '\'');
- writeln!(&mut v, "{}", '"');
- writeln!(&mut v, r"{}", '"'); // don't lint
- writeln!(&mut v, r"{}", '\'');
+#![allow(unused_must_use)]
+#![warn(clippy::write_literal)]
+
+use std::io::Write;
+
+fn main() {
+ let mut v = Vec::new();
+
- &mut v,
++ writeln!(v, "{}", "{hello}");
++ writeln!(v, r"{}", r"{hello}");
++ writeln!(v, "{}", '\'');
++ writeln!(v, "{}", '"');
++ writeln!(v, r"{}", '"'); // don't lint
++ writeln!(v, r"{}", '\'');
+ writeln!(
- &mut v,
++ v,
+ "some {}",
+ "hello \
+ world!"
+ );
+ writeln!(
++ v,
+ "some {}\
+ {} \\ {}",
+ "1", "2", "3",
+ );
+}
--- /dev/null
- --> $DIR/write_literal_2.rs:9:28
+error: literal with an empty format string
- LL | writeln!(&mut v, "{}", "{hello}");
- | ^^^^^^^^^
++ --> $DIR/write_literal_2.rs:9:23
+ |
- LL - writeln!(&mut v, "{}", "{hello}");
- LL + writeln!(&mut v, "{{hello}}");
++LL | writeln!(v, "{}", "{hello}");
++ | ^^^^^^^^^
+ |
+ = note: `-D clippy::write-literal` implied by `-D warnings`
+help: try this
+ |
- --> $DIR/write_literal_2.rs:10:29
++LL - writeln!(v, "{}", "{hello}");
++LL + writeln!(v, "{{hello}}");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, r"{}", r"{hello}");
- | ^^^^^^^^^^
++ --> $DIR/write_literal_2.rs:10:24
+ |
- LL - writeln!(&mut v, r"{}", r"{hello}");
- LL + writeln!(&mut v, r"{{hello}}");
++LL | writeln!(v, r"{}", r"{hello}");
++ | ^^^^^^^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal_2.rs:11:28
++LL - writeln!(v, r"{}", r"{hello}");
++LL + writeln!(v, r"{{hello}}");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{}", '/'');
- | ^^^^
++ --> $DIR/write_literal_2.rs:11:23
+ |
- LL - writeln!(&mut v, "{}", '/'');
- LL + writeln!(&mut v, "'");
++LL | writeln!(v, "{}", '/'');
++ | ^^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal_2.rs:12:28
++LL - writeln!(v, "{}", '/'');
++LL + writeln!(v, "'");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, "{}", '"');
- | ^^^
++ --> $DIR/write_literal_2.rs:12:23
+ |
- LL - writeln!(&mut v, "{}", '"');
- LL + writeln!(&mut v, "/"");
++LL | writeln!(v, "{}", '"');
++ | ^^^
+ |
+help: try this
+ |
- --> $DIR/write_literal_2.rs:14:29
++LL - writeln!(v, "{}", '"');
++LL + writeln!(v, "/"");
+ |
+
+error: literal with an empty format string
- LL | writeln!(&mut v, r"{}", '/'');
- | ^^^^
++ --> $DIR/write_literal_2.rs:14:24
+ |
- LL - writeln!(&mut v, r"{}", '/'');
- LL + writeln!(&mut v, r"'");
++LL | writeln!(v, r"{}", '/'');
++ | ^^^^
+ |
+help: try this
+ |
++LL - writeln!(v, r"{}", '/'');
++LL + writeln!(v, r"'");
+ |
+
+error: literal with an empty format string
+ --> $DIR/write_literal_2.rs:18:9
+ |
+LL | / "hello /
+LL | | world!"
+ | |_______________^
+ |
+help: try this
+ |
+LL ~ "some hello /
+LL ~ world!"
+ |
+
+error: literal with an empty format string
+ --> $DIR/write_literal_2.rs:25:9
+ |
+LL | "1", "2", "3",
+ | ^^^
+ |
+help: try this
+ |
+LL ~ "some 1/
+LL ~ {} / {}", "2", "3",
+ |
+
+error: literal with an empty format string
+ --> $DIR/write_literal_2.rs:25:14
+ |
+LL | "1", "2", "3",
+ | ^^^
+ |
+help: try this
+ |
+LL ~ 2 / {}",
+LL ~ "1", "3",
+ |
+
+error: literal with an empty format string
+ --> $DIR/write_literal_2.rs:25:19
+ |
+LL | "1", "2", "3",
+ | ^^^
+ |
+help: try this
+ |
+LL ~ {} / 3",
+LL ~ "1", "2",
+ |
+
+error: aborting due to 9 previous errors
+
--- /dev/null
- write!(&mut v, "Hello\n");
- write!(&mut v, "Hello {}\n", "world");
- write!(&mut v, "Hello {} {}\n", "world", "#2");
- write!(&mut v, "{}\n", 1265);
- write!(&mut v, "\n");
+// FIXME: Ideally these suggestions would be fixed via rustfix. Blocked by rust-lang/rust#53934
+// // run-rustfix
+
+#![allow(clippy::write_literal)]
+#![warn(clippy::write_with_newline)]
+
+use std::io::Write;
+
+fn main() {
+ let mut v = Vec::new();
+
+ // These should fail
- write!(&mut v, "");
- write!(&mut v, "Hello");
- writeln!(&mut v, "Hello");
- writeln!(&mut v, "Hello\n");
- writeln!(&mut v, "Hello {}\n", "world");
- write!(&mut v, "Issue\n{}", 1265);
- write!(&mut v, "{}", 1265);
- write!(&mut v, "\n{}", 1275);
- write!(&mut v, "\n\n");
- write!(&mut v, "like eof\n\n");
- write!(&mut v, "Hello {} {}\n\n", "world", "#2");
- writeln!(&mut v, "\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
- writeln!(&mut v, "\nbla\n\n"); // #3126
++ write!(v, "Hello\n");
++ write!(v, "Hello {}\n", "world");
++ write!(v, "Hello {} {}\n", "world", "#2");
++ write!(v, "{}\n", 1265);
++ write!(v, "\n");
+
+ // These should be fine
- write!(&mut v, "\\n"); // #3514
- write!(&mut v, "\\\n"); // should fail
- write!(&mut v, "\\\\n");
++ write!(v, "");
++ write!(v, "Hello");
++ writeln!(v, "Hello");
++ writeln!(v, "Hello\n");
++ writeln!(v, "Hello {}\n", "world");
++ write!(v, "Issue\n{}", 1265);
++ write!(v, "{}", 1265);
++ write!(v, "\n{}", 1275);
++ write!(v, "\n\n");
++ write!(v, "like eof\n\n");
++ write!(v, "Hello {} {}\n\n", "world", "#2");
++ writeln!(v, "\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
++ writeln!(v, "\nbla\n\n"); // #3126
+
+ // Escaping
- write!(&mut v, r"\n"); // #3778
++ write!(v, "\\n"); // #3514
++ write!(v, "\\\n"); // should fail
++ write!(v, "\\\\n");
+
+ // Raw strings
- &mut v,
++ write!(v, r"\n"); // #3778
+
+ // Literal newlines should also fail
+ write!(
- &mut v,
++ v,
+ "
+"
+ );
+ write!(
- write!(&mut v, "\r\n");
- write!(&mut v, "foo\r\n");
- write!(&mut v, "\\r\n"); //~ ERROR
- write!(&mut v, "foo\rbar\n");
++ v,
+ r"
+"
+ );
+
+ // Don't warn on CRLF (#4208)
++ write!(v, "\r\n");
++ write!(v, "foo\r\n");
++ write!(v, "\\r\n"); //~ ERROR
++ write!(v, "foo\rbar\n");
+}
--- /dev/null
- LL | write!(&mut v, "Hello/n");
- | ^^^^^^^^^^^^^^^^^^^^^^^^^
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:13:5
+ |
- LL - write!(&mut v, "Hello/n");
- LL + writeln!(&mut v, "Hello");
++LL | write!(v, "Hello/n");
++ | ^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: `-D clippy::write-with-newline` implied by `-D warnings`
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "Hello {}/n", "world");
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "Hello/n");
++LL + writeln!(v, "Hello");
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:14:5
+ |
- LL - write!(&mut v, "Hello {}/n", "world");
- LL + writeln!(&mut v, "Hello {}", "world");
++LL | write!(v, "Hello {}/n", "world");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "Hello {} {}/n", "world", "#2");
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "Hello {}/n", "world");
++LL + writeln!(v, "Hello {}", "world");
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:15:5
+ |
- LL - write!(&mut v, "Hello {} {}/n", "world", "#2");
- LL + writeln!(&mut v, "Hello {} {}", "world", "#2");
++LL | write!(v, "Hello {} {}/n", "world", "#2");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "{}/n", 1265);
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "Hello {} {}/n", "world", "#2");
++LL + writeln!(v, "Hello {} {}", "world", "#2");
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:16:5
+ |
- LL - write!(&mut v, "{}/n", 1265);
- LL + writeln!(&mut v, "{}", 1265);
++LL | write!(v, "{}/n", 1265);
++ | ^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "/n");
- | ^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "{}/n", 1265);
++LL + writeln!(v, "{}", 1265);
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:17:5
+ |
- LL - write!(&mut v, "/n");
- LL + writeln!(&mut v);
++LL | write!(v, "/n");
++ | ^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "//n"); // should fail
- | ^^^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "/n");
++LL + writeln!(v);
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:36:5
+ |
- LL - write!(&mut v, "//n"); // should fail
- LL + writeln!(&mut v, "/"); // should fail
++LL | write!(v, "//n"); // should fail
++ | ^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | | &mut v,
++LL - write!(v, "//n"); // should fail
++LL + writeln!(v, "/"); // should fail
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:43:5
+ |
+LL | / write!(
- LL | &mut v,
++LL | | v,
+LL | | "
+LL | | "
+LL | | );
+ | |_____^
+ |
+help: use `writeln!()` instead
+ |
+LL ~ writeln!(
- LL | | &mut v,
++LL | v,
+LL ~ ""
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:48:5
+ |
+LL | / write!(
- LL | &mut v,
++LL | | v,
+LL | | r"
+LL | | "
+LL | | );
+ | |_____^
+ |
+help: use `writeln!()` instead
+ |
+LL ~ writeln!(
- LL | write!(&mut v, "/r/n"); //~ ERROR
- | ^^^^^^^^^^^^^^^^^^^^^^^
++LL | v,
+LL ~ r""
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:57:5
+ |
- LL - write!(&mut v, "/r/n"); //~ ERROR
- LL + writeln!(&mut v, "/r"); //~ ERROR
++LL | write!(v, "/r/n"); //~ ERROR
++ | ^^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
- LL | write!(&mut v, "foo/rbar/n");
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
++LL - write!(v, "/r/n"); //~ ERROR
++LL + writeln!(v, "/r"); //~ ERROR
+ |
+
+error: using `write!()` with a format string that ends in a single newline
+ --> $DIR/write_with_newline.rs:58:5
+ |
- LL - write!(&mut v, "foo/rbar/n");
- LL + writeln!(&mut v, "foo/rbar");
++LL | write!(v, "foo/rbar/n");
++ | ^^^^^^^^^^^^^^^^^^^^^^^
+ |
+help: use `writeln!()` instead
+ |
++LL - write!(v, "foo/rbar/n");
++LL + writeln!(v, "foo/rbar");
+ |
+
+error: aborting due to 10 previous errors
+
--- /dev/null
- writeln!(&mut v);
+// run-rustfix
+
+#![allow(unused_must_use)]
+#![warn(clippy::writeln_empty_string)]
+use std::io::Write;
+
+fn main() {
+ let mut v = Vec::new();
+
+ // These should fail
- writeln!(&mut suggestion);
++ writeln!(v);
+
+ let mut suggestion = Vec::new();
- writeln!(&mut v);
- writeln!(&mut v, " ");
- write!(&mut v, "");
++ writeln!(suggestion);
+
+ // These should be fine
++ writeln!(v);
++ writeln!(v, " ");
++ write!(v, "");
+}
--- /dev/null
- writeln!(&mut v, "");
+// run-rustfix
+
+#![allow(unused_must_use)]
+#![warn(clippy::writeln_empty_string)]
+use std::io::Write;
+
+fn main() {
+ let mut v = Vec::new();
+
+ // These should fail
- writeln!(&mut suggestion, "");
++ writeln!(v, "");
+
+ let mut suggestion = Vec::new();
- writeln!(&mut v);
- writeln!(&mut v, " ");
- write!(&mut v, "");
++ writeln!(suggestion, "");
+
+ // These should be fine
++ writeln!(v);
++ writeln!(v, " ");
++ write!(v, "");
+}
--- /dev/null
- error: using `writeln!(&mut v, "")`
++error: using `writeln!(v, "")`
+ --> $DIR/writeln_empty_string.rs:11:5
+ |
- LL | writeln!(&mut v, "");
- | ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `writeln!(&mut v)`
++LL | writeln!(v, "");
++ | ^^^^^^^^^^^^^^^ help: replace it with: `writeln!(v)`
+ |
+ = note: `-D clippy::writeln-empty-string` implied by `-D warnings`
+
- error: using `writeln!(&mut suggestion, "")`
++error: using `writeln!(suggestion, "")`
+ --> $DIR/writeln_empty_string.rs:14:5
+ |
- LL | writeln!(&mut suggestion, "");
- | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `writeln!(&mut suggestion)`
++LL | writeln!(suggestion, "");
++ | ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `writeln!(suggestion)`
+
+error: aborting due to 2 previous errors
+
--- /dev/null
+<!DOCTYPE html>
+<!--
+Welcome to a Clippy's lint list, at least the source code of it. If you are
+interested in contributing to this website checkout `util/gh-pages/index.html`
+inside the rust-clippy repository.
+
+Otherwise, have a great day =^.^=
+-->
+<html lang="en">
+<head>
+ <meta charset="UTF-8"/>
+ <meta name="viewport" content="width=device-width, initial-scale=1"/>
+
+ <title>Clippy Lints</title>
+
+ <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.6/css/bootstrap.min.css"/>
+ <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.5.0/styles/github.min.css"/>
+
+ <!-- The files are not copied over into the Clippy project since they use the MPL-2.0 License -->
+ <link rel="stylesheet" href="https://rust-lang.github.io/mdBook/css/variables.css"/>
+ <link id="styleHighlight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/highlight.css">
+ <link id="styleNight" rel="stylesheet" href="https://rust-lang.github.io/mdBook/tomorrow-night.css" disabled="true">
+ <link id="styleAyu" rel="stylesheet" href="https://rust-lang.github.io/mdBook/ayu-highlight.css" disabled="true">
+ <style>
+ blockquote { font-size: 1em; }
+ [ng\:cloak], [ng-cloak], [data-ng-cloak], [x-ng-cloak], .ng-cloak, .x-ng-cloak { display: none !important; }
+
+ .form-inline .checkbox { margin-right: 0.6em }
+
+ .panel-heading { cursor: pointer; }
+
+ .panel-title { display: flex; flex-wrap: wrap;}
+ .panel-title .label { display: inline-block; }
+
+ .panel-title-name { flex: 1; min-width: 400px;}
+ .panel-title-name span { vertical-align: bottom; }
+
+ .panel .panel-title-name .anchor { display: none; }
+ .panel:hover .panel-title-name .anchor { display: inline;}
+
+ .label {
+ padding-top: 0.3em;
+ padding-bottom: 0.3em;
+ }
+
+ .label-lint-group {
+ min-width: 8em;
+ }
+ .label-lint-level {
+ min-width: 4em;
+ }
+
+ .label-lint-level-allow {
+ background-color: #5cb85c;
+ }
+ .label-lint-level-warn {
+ background-color: #f0ad4e;
+ }
+ .label-lint-level-deny {
+ background-color: #d9534f;
+ }
+ .label-lint-level-none {
+ background-color: #777777;
+ opacity: 0.5;
+ }
+
+ .label-group-deprecated {
+ opacity: 0.5;
+ }
+
+ .label-doc-folding {
+ color: #000;
+ background-color: #fff;
+ border: 1px solid var(--theme-popup-border);
+ }
+ .label-doc-folding:hover {
+ background-color: #e6e6e6;
+ }
+
+ .lint-doc-md > h3 {
+ border-top: 1px solid var(--theme-popup-border);
+ padding: 10px 15px;
+ margin: 0 -15px;
+ font-size: 18px;
+ }
+ .lint-doc-md > h3:first-child {
+ border-top: none;
+ padding-top: 0px;
+ }
+
+ @media (max-width:749px) {
+ .lint-additional-info-container {
+ display: flex;
+ flex-flow: column;
+ }
+ .lint-additional-info-item + .lint-additional-info-item {
+ border-top: 1px solid var(--theme-popup-border);
+ }
+ }
+ @media (min-width:750px) {
+ .lint-additional-info-container {
+ display: flex;
+ flex-flow: row;
+ }
+ .lint-additional-info-item + .lint-additional-info-item {
+ border-left: 1px solid var(--theme-popup-border);
+ }
+ }
+
+ .lint-additional-info-item {
+ display: inline-flex;
+ min-width: 200px;
+ flex-grow: 1;
+ padding: 9px 5px 5px 15px;
+ }
+
+ .label-applicability {
+ background-color: #777777;
+ margin: auto 5px;
+ }
+
+ .label-version {
+ background-color: #777777;
+ margin: auto 5px;
+ font-family: monospace;
+ }
+ </style>
+ <style>
+ /* Expanding the mdBoom theme*/
+ .light {
+ --inline-code-bg: #f6f7f6;
+ }
+ .rust {
+ --inline-code-bg: #f6f7f6;
+ }
+ .coal {
+ --inline-code-bg: #1d1f21;
+ }
+ .navy {
+ --inline-code-bg: #1d1f21;
+ }
+ .ayu {
+ --inline-code-bg: #191f26;
+ }
+
+ /* Applying the mdBook theme */
+ .theme-icon {
+ position: absolute;
+ text-align: center;
+ width: 2em;
+ height: 2em;
+ margin: 0.7em;
+ line-height: 2em;
+ border: solid 1px var(--icons);
+ border-radius: 5px;
+ user-select: none;
+ cursor: pointer;
+ }
+ .theme-icon:hover {
+ background: var(--theme-hover);
+ }
+ .theme-choice {
+ position: absolute;
+ margin-top: calc(2em + 0.7em);
+ margin-left: 0.7em;
+ list-style: none;
+ border: 1px solid var(--theme-popup-border);
+ border-radius: 5px;
+ color: var(--fg);
+ background: var(--theme-popup-bg);
+ padding: 0 0;
+ }
+ .theme-choice > li {
+ padding: 5px 10px;
+ font-size: 0.8em;
+ user-select: none;
+ cursor: pointer;
+ }
+ .theme-choice > li:hover {
+ background: var(--theme-hover);
+ }
+
+ .alert {
+ color: var(--fg);
+ background: var(--theme-hover);
+ border: 1px solid var(--theme-popup-border);
+ }
+ .page-header {
+ border-color: var(--theme-popup-border);
+ }
+ .panel-default > .panel-heading {
+ background: var(--theme-hover);
+ color: var(--fg);
+ border: 1px solid var(--theme-popup-border);
+ }
+ .panel-default > .panel-heading:hover {
+ filter: brightness(90%);
+ }
+ .list-group-item {
+ background: 0%;
+ border: 1px solid var(--theme-popup-border);
+ }
+ .panel, pre, hr {
+ background: var(--bg);
+ border: 1px solid var(--theme-popup-border);
+ }
+
+ #filter-label, #filter-clear {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ filter: brightness(95%);
+ }
+ #filter-label:hover, #filter-clear:hover {
+ filter: brightness(90%);
+ }
+ #filter-input {
+ background: var(--searchbar-bg);
+ color: var(--searchbar-fg);
+ border-color: var(--theme-popup-border);
+ }
+
+ #filter-input::-webkit-input-placeholder,
+ #filter-input::-moz-placeholder {
+ color: var(--searchbar-fg);
+ opacity: 30%;
+ }
+
+ :not(pre) > code {
+ color: var(--inline-code-color);
+ background-color: var(--inline-code-bg);
+ }
+ html {
+ scrollbar-color: var(--scrollbar) var(--bg);
+ }
+ body {
+ background: var(--bg);
+ color: var(--fg);
+ }
+
+ </style>
+</head>
+<body>
+ <div id="theme-icon" class="theme-icon">🖌</div>
+ <ul id="theme-menu" class="theme-choice" style="display: none;">
+ <li id="light">Light</li>
+ <li id="rust">Rust</li>
+ <li id="coal">Coal</li>
+ <li id="navy">Navy</li>
+ <li id="ayu">Ayu</li>
+ </ul>
+
+ <div class="container" ng-app="clippy" ng-controller="lintList">
+ <div class="page-header">
+ <h1>Clippy Lints</h1>
+ </div>
+
+ <noscript>
+ <div class="alert alert-danger" role="alert">
+ Sorry, this site only works with JavaScript! :(
+ </div>
+ </noscript>
+
+ <div ng-cloak>
+
+ <div class="alert alert-info" role="alert" ng-if="loading">
+ Loading…
+ </div>
+ <div class="alert alert-danger" role="alert" ng-if="error">
+ Error loading lints!
+ </div>
+
+ <div class="panel panel-default" ng-show="data">
+ <div class="panel-body row filter-panel">
+ <div class="col-md-6 form-inline">
+ <div class="form-group form-group-lg">
+ <p class="h4">
+ Lint levels
+ <a href="https://doc.rust-lang.org/rustc/lints/levels.html">(?)</a>
+ </p>
+ <div class="checkbox" ng-repeat="(level, enabled) in levels">
+ <label class="text-capitalize">
+ <input type="checkbox" ng-model="levels[level]" />
+ {{level}}
+ </label>
+ </div>
+ </div>
+ </div>
+ <div class="col-md-6 form-inline">
+ <div class="form-group form-group-lg">
+ <p class="h4">
+ Lint groups
+ <a href="https://github.com/rust-lang/rust-clippy/#clippy">(?)</a>
+ </p>
+ <div class="checkbox" ng-repeat="(group, enabled) in groups">
+ <label class="text-capitalize">
+ <input type="checkbox" ng-model="groups[group]" />
+ {{group}}
+ </label>
+ </div>
+ </div>
+ </div>
+ </div>
+ <div class="panel-body row">
+ <div class="col-md-12 form-horizontal">
+ <div class="input-group">
+ <label class="input-group-addon" id="filter-label" for="filter-input">Filter:</label>
+ <input type="text" class="form-control" placeholder="Keywords or search string" id="filter-input" ng-model="search" ng-model-options="{debounce: 50}"/>
+ <span class="input-group-btn">
+ <button id="filter-clear" class="btn" type="button" ng-click="search = ''">
+ Clear
+ </button>
+ </span>
+ </div>
+ </div>
+ </div>
+ </div>
+ <!-- The order of the filters should be from most likely to remove a lint to least likely to improve performance. -->
+ <article class="panel panel-default" id="{{lint.id}}" ng-repeat="lint in data | filter:bySearch | filter:byGroups | filter:byLevels">
+ <header class="panel-heading" ng-click="open[lint.id] = !open[lint.id]">
+ <h2 class="panel-title">
+ <div class="panel-title-name">
+ <span>{{lint.id}}</span>
+ <a href="#{{lint.id}}" class="anchor label label-default" ng-click="open[lint.id] = true; $event.stopPropagation()">¶</a>
+ </div>
+
+ <div class="panel-title-addons">
+ <span class="label label-lint-group label-default label-group-{{lint.group}}">{{lint.group}}</span>
+
+ <span class="label label-lint-level label-lint-level-{{lint.level}}">{{lint.level}}</span>
+
+
+ <span class="label label-doc-folding" ng-show="open[lint.id]">−</span>
+ <span class="label label-doc-folding" ng-hide="open[lint.id]">+</span>
+ </div>
+ </h2>
+ </header>
+
+ <div class="list-group lint-docs" ng-class="{collapse: true, in: open[lint.id]}">
+ <div class="list-group-item lint-doc-md" ng-bind-html="lint.docs | markdown"></div>
+ <div class="lint-additional-info-container">
+ <!-- Applicability -->
+ <div class="lint-additional-info-item">
+ <span> Applicability: </span>
+ <span class="label label-default label-applicability">{{lint.applicability.applicability}}</span>
+ <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint_defs/enum.Applicability.html#variants">(?)</a>
+ </div>
+ <!-- Clippy version -->
+ <div class="lint-additional-info-item">
+ <span>{{lint.group == "deprecated" ? "Deprecated" : "Added"}} in: </span>
+ <span class="label label-default label-version">{{lint.version}}</span>
+ </div>
+ <!-- Open related issues -->
+ <div class="lint-additional-info-item">
+ <a href="https://github.com/rust-lang/rust-clippy/issues?q=is%3Aissue+{{lint.id}}">Related Issues</a>
+ </div>
+ <!-- Jump to source -->
+ <div class="lint-additional-info-item">
+ <a href="https://github.com/rust-lang/rust-clippy/blob/{{docVersion}}/clippy_lints/{{lint.id_span.path}}#L{{lint.id_span.line}}">View Source</a>
+ </div>
+ </div>
+ </div>
+ </article>
+ </div>
+ </div>
+
+ <a href="https://github.com/rust-lang/rust-clippy">
+ <img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on Github"/>
+ </a>
+
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/markdown-it/12.3.2/markdown-it.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.5.0/highlight.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.5.0/languages/rust.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.12/angular.min.js"></script>
+ <script>
+ (function () {
+ var md = window.markdownit({
+ html: true,
+ linkify: true,
+ typographer: true,
+ highlight: function (str, lang) {
+ if (lang && hljs.getLanguage(lang)) {
+ try {
+ return '<pre class="hljs"><code>' +
+ hljs.highlight(lang, str, true).value +
+ '</code></pre>';
+ } catch (__) {}
+ }
+
+ return '<pre class="hljs"><code>' + md.utils.escapeHtml(str) + '</code></pre>';
+ }
+ });
+
+ function scrollToLint(lintId) {
+ var target = document.getElementById(lintId);
+ if (!target) {
+ return;
+ }
+ target.scrollIntoView();
+ }
+
+ function scrollToLintByURL($scope) {
+ var removeListener = $scope.$on('ngRepeatFinished', function(ngRepeatFinishedEvent) {
+ scrollToLint(window.location.hash.slice(1));
+ removeListener();
+ });
+ }
+
+ function selectGroup($scope, selectedGroup) {
+ var groups = $scope.groups;
+ for (var group in groups) {
+ if (groups.hasOwnProperty(group)) {
+ if (group === selectedGroup) {
+ groups[group] = true;
+ } else {
+ groups[group] = false;
+ }
+ }
+ }
+ }
+
+ angular.module("clippy", [])
+ .filter('markdown', function ($sce) {
+ return function (text) {
+ return $sce.trustAsHtml(
+ md.render(text || '')
+ // Oh deer, what a hack :O
+ .replace('<table', '<table class="table"')
+ );
+ };
+ })
+ .directive('onFinishRender', function ($timeout) {
+ return {
+ restrict: 'A',
+ link: function (scope, element, attr) {
+ if (scope.$last === true) {
+ $timeout(function () {
+ scope.$emit(attr.onFinishRender);
+ });
+ }
+ }
+ };
+ })
+ .controller("lintList", function ($scope, $http, $timeout) {
+ // Level filter
+ var LEVEL_FILTERS_DEFAULT = {allow: true, warn: true, deny: true, none: true};
+ $scope.levels = LEVEL_FILTERS_DEFAULT;
+ $scope.byLevels = function (lint) {
+ return $scope.levels[lint.level];
+ };
+
+ var GROUPS_FILTER_DEFAULT = {
+ cargo: true,
+ complexity: true,
+ correctness: true,
+ deprecated: false,
+ nursery: true,
+ pedantic: true,
+ perf: true,
+ restriction: true,
+ style: true,
+ suspicious: true,
+ };
+ $scope.groups = GROUPS_FILTER_DEFAULT;
+ $scope.byGroups = function (lint) {
+ return $scope.groups[lint.group];
+ };
+
+ $scope.bySearch = function (lint, index, array) {
+ let searchStr = $scope.search;
+ // It can be `null` I haven't missed this value
+ if (searchStr == null || searchStr.length < 3) {
+ return true;
+ }
+ searchStr = searchStr.toLowerCase();
+
+ // Search by id
+ if (lint.id.indexOf(searchStr.replace("-", "_")) !== -1) {
+ return true;
+ }
+
+ // Search the description
+ // The use of `for`-loops instead of `foreach` enables us to return early
+ let terms = searchStr.split(" ");
+ let docsLowerCase = lint.docs.toLowerCase();
+ for (index = 0; index < terms.length; index++) {
+ // This is more likely and will therefor be checked first
+ if (docsLowerCase.indexOf(terms[index]) !== -1) {
+ continue;
+ }
+
+ if (lint.id.indexOf(terms[index]) !== -1) {
+ continue;
+ }
+
+ return false;
+ }
+
+ return true;
+ }
+
+ // Get data
+ $scope.open = {};
+ $scope.loading = true;
+ // This will be used to jump into the source code of the version that this documentation is for.
+ $scope.docVersion = window.location.pathname.split('/')[2] || "master";
+
+ if (window.location.hash.length > 1) {
+ $scope.search = window.location.hash.slice(1);
+ $scope.open[window.location.hash.slice(1)] = true;
+ scrollToLintByURL($scope);
+ }
+
+ $http.get('./lints.json')
+ .success(function (data) {
+ $scope.data = data;
+ $scope.loading = false;
+
+ var selectedGroup = getQueryVariable("sel");
+ if (selectedGroup) {
+ selectGroup($scope, selectedGroup.toLowerCase());
+ }
+
+ scrollToLintByURL($scope);
++
++ setTimeout(function () {
++ var el = document.getElementById('filter-input');
++ if (el) { el.focus() }
++ }, 0);
+ })
+ .error(function (data) {
+ $scope.error = data;
+ $scope.loading = false;
+ });
+
+ window.addEventListener('hashchange', function () {
+ // trigger re-render
+ $timeout(function () {
+ $scope.levels = LEVEL_FILTERS_DEFAULT;
+ $scope.search = window.location.hash.slice(1);
+ $scope.open[window.location.hash.slice(1)] = true;
+
+ scrollToLintByURL($scope);
+ });
+ return true;
+ }, false);
+ });
+ })();
+
+ function getQueryVariable(variable) {
+ var query = window.location.search.substring(1);
+ var vars = query.split('&');
+ for (var i = 0; i < vars.length; i++) {
+ var pair = vars[i].split('=');
+ if (decodeURIComponent(pair[0]) == variable) {
+ return decodeURIComponent(pair[1]);
+ }
+ }
+ }
+
+ function setupListeners() {
+ let themeIcon = document.getElementById("theme-icon");
+ let themeMenu = document.getElementById("theme-menu");
+ themeIcon.addEventListener("click", function(e) {
+ if (themeMenu.style.display == "none") {
+ themeMenu.style.display = "block";
+ } else {
+ themeMenu.style.display = "none";
+ }
+ });
+
+ let children = themeMenu.children;
+ for (let index = 0; index < children.length; index++) {
+ let child = children[index];
+ child.addEventListener("click", function(e) {
+ setTheme(child.id, true);
+ });
+ }
+ }
+
+ setupListeners();
+
+ function setTheme(theme, store) {
+ let enableHighlight = false;
+ let enableNight = false;
+ let enableAyu = false;
+
+ if (theme == "ayu") {
+ enableAyu = true;
+ } else if (theme == "coal" || theme == "navy") {
+ enableNight = true;
+ } else if (theme == "rust") {
+ enableHighlight = true;
+ } else {
+ enableHighlight = true;
+ // this makes sure that an unknown theme request gets set to a known one
+ theme = "light";
+ }
+ document.getElementsByTagName("body")[0].className = theme;
+
+ document.getElementById("styleHighlight").disabled = !enableHighlight;
+ document.getElementById("styleNight").disabled = !enableNight;
+ document.getElementById("styleAyu").disabled = !enableAyu;
+
+ if (store) {
+ try {
+ localStorage.setItem('clippy-lint-list-theme', theme);
+ } catch (e) { }
+ }
+ }
+
+ // loading the theme after the initial load
+ setTheme(localStorage.getItem('clippy-lint-list-theme'), false);
+ </script>
+</body>
+</html>
projects / rust.git / commitdiff