diff --git a/src/tools/clippy/CHANGELOG.md b/src/tools/clippy/CHANGELOG.md index a6e69491017..5e9ed54c848 100644 --- a/src/tools/clippy/CHANGELOG.md +++ b/src/tools/clippy/CHANGELOG.md @@ -6,13 +6,13 @@ document. ## Unreleased / In Rust Nightly -[c2c07fa...master](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...master) +[c2c07fa...master](https://github.com/rust-lang/rust-clippy/compare/c2c07fa...master) ## Rust 1.46 Current beta, release 2020-08-27 -[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...master) +[7ea7cd1...c2c07fa](https://github.com/rust-lang/rust-clippy/compare/7ea7cd1...c2c07fa) ### New lints @@ -1454,6 +1454,7 @@ Released 2018-09-13 [`deprecated_semver`]: https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_semver [`deref_addrof`]: https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof [`derive_hash_xor_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq +[`derive_ord_xor_partial_ord`]: https://rust-lang.github.io/rust-clippy/master/index.html#derive_ord_xor_partial_ord [`diverging_sub_expression`]: https://rust-lang.github.io/rust-clippy/master/index.html#diverging_sub_expression [`doc_markdown`]: https://rust-lang.github.io/rust-clippy/master/index.html#doc_markdown [`double_comparisons`]: https://rust-lang.github.io/rust-clippy/master/index.html#double_comparisons @@ -1615,6 +1616,7 @@ Released 2018-09-13 [`mutex_atomic`]: https://rust-lang.github.io/rust-clippy/master/index.html#mutex_atomic [`mutex_integer`]: https://rust-lang.github.io/rust-clippy/master/index.html#mutex_integer [`naive_bytecount`]: https://rust-lang.github.io/rust-clippy/master/index.html#naive_bytecount +[`needless_arbitrary_self_type`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_arbitrary_self_type [`needless_bool`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool [`needless_borrow`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow [`needless_borrowed_reference`]: https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrowed_reference @@ -1686,6 +1688,7 @@ Released 2018-09-13 [`result_map_unit_fn`]: https://rust-lang.github.io/rust-clippy/master/index.html#result_map_unit_fn [`reversed_empty_ranges`]: https://rust-lang.github.io/rust-clippy/master/index.html#reversed_empty_ranges [`same_functions_in_if_condition`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_functions_in_if_condition +[`same_item_push`]: https://rust-lang.github.io/rust-clippy/master/index.html#same_item_push [`search_is_some`]: https://rust-lang.github.io/rust-clippy/master/index.html#search_is_some [`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 @@ -1701,6 +1704,7 @@ Released 2018-09-13 [`single_match_else`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match_else [`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 @@ -1723,6 +1727,7 @@ Released 2018-09-13 [`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 +[`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 diff --git a/src/tools/clippy/CONTRIBUTING.md b/src/tools/clippy/CONTRIBUTING.md index 69a734e4ee4..5f7b1e85ee9 100644 --- a/src/tools/clippy/CONTRIBUTING.md +++ b/src/tools/clippy/CONTRIBUTING.md @@ -28,11 +28,14 @@ All contributors are expected to follow the [Rust Code of Conduct]. ## Getting started -High level approach: +**Note: If this is your first time contributing to Clippy, you should +first read the [Basics docs](doc/basics.md).** + +### High level approach 1. Find something to fix/improve 2. Change code (likely some file in `clippy_lints/src/`) -3. Follow the instructions in the [docs for writing lints](doc/adding_lints.md) such as running the `setup-toolchain.sh` script +3. Follow the instructions in the [Basics docs](doc/basics.md) to get set up 4. Run `cargo test` in the root directory and wiggle code until it passes 5. Open a PR (also can be done after 2. if you run into problems) @@ -95,16 +98,16 @@ quick read. ## Getting code-completion for rustc internals to work -Unfortunately, [`rust-analyzer`][ra_homepage] does not (yet?) understand how Clippy uses compiler-internals -using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not -available via a `rustup` component at the time of writing. -To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via -`git clone https://github.com/rust-lang/rust/`. -Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies -which rust-analyzer will be able to understand. -Run `cargo dev ra-setup --repo-path ` where `` is an absolute path to the rustc repo -you just cloned. -The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to +Unfortunately, [`rust-analyzer`][ra_homepage] does not (yet?) understand how Clippy uses compiler-internals +using `extern crate` and it also needs to be able to read the source files of the rustc-compiler which are not +available via a `rustup` component at the time of writing. +To work around this, you need to have a copy of the [rustc-repo][rustc_repo] available which can be obtained via +`git clone https://github.com/rust-lang/rust/`. +Then you can run a `cargo dev` command to automatically make Clippy use the rustc-repo via path-dependencies +which rust-analyzer will be able to understand. +Run `cargo dev ra-setup --repo-path ` where `` is an absolute path to the rustc repo +you just cloned. +The command will add path-dependencies pointing towards rustc-crates inside the rustc repo to Clippys `Cargo.toml`s and should allow rust-analyzer to understand most of the types that Clippy uses. Just make sure to remove the dependencies again before finally making a pull request! diff --git a/src/tools/clippy/clippy_dev/src/ra_setup.rs b/src/tools/clippy/clippy_dev/src/ra_setup.rs index 8617445c8a6..f2bd651ab25 100644 --- a/src/tools/clippy/clippy_dev/src/ra_setup.rs +++ b/src/tools/clippy/clippy_dev/src/ra_setup.rs @@ -68,10 +68,11 @@ fn inject_deps_into_manifest( }); // format a new [dependencies]-block with the new deps we need to inject - let mut all_deps = String::from("[dependencies]\n"); + let mut all_deps = String::from("[target.'cfg(NOT_A_PLATFORM)'.dependencies]\n"); new_deps.for_each(|dep_line| { all_deps.push_str(&dep_line); }); + all_deps.push_str("\n[dependencies]\n"); // replace "[dependencies]" with // [dependencies] diff --git a/src/tools/clippy/clippy_lints/src/attrs.rs b/src/tools/clippy/clippy_lints/src/attrs.rs index 40af6bb3d7b..376ac55f9c9 100644 --- a/src/tools/clippy/clippy_lints/src/attrs.rs +++ b/src/tools/clippy/clippy_lints/src/attrs.rs @@ -1,6 +1,5 @@ //! checks for attributes -use crate::reexport::Name; use crate::utils::{ first_line_of_span, is_present_in_source, match_def_path, paths, snippet_opt, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, without_block_comments, @@ -517,7 +516,7 @@ fn is_relevant_expr(cx: &LateContext<'_>, typeck_results: &ty::TypeckResults<'_> } } -fn check_attrs(cx: &LateContext<'_>, span: Span, name: Name, attrs: &[Attribute]) { +fn check_attrs(cx: &LateContext<'_>, span: Span, name: Symbol, attrs: &[Attribute]) { if span.from_expansion() { return; } @@ -606,7 +605,7 @@ fn check_empty_line_after_outer_attr(cx: &EarlyContext<'_>, item: &rustc_ast::as cx, EMPTY_LINE_AFTER_OUTER_ATTR, begin_of_attr_to_item, - "Found an empty line after an outer attribute. \ + "found an empty line after an outer attribute. \ Perhaps you forgot to add a `!` to make it an inner attribute?", ); } diff --git a/src/tools/clippy/clippy_lints/src/bytecount.rs b/src/tools/clippy/clippy_lints/src/bytecount.rs index dde799fcae4..cdb49d777d8 100644 --- a/src/tools/clippy/clippy_lints/src/bytecount.rs +++ b/src/tools/clippy/clippy_lints/src/bytecount.rs @@ -82,8 +82,8 @@ impl<'tcx> LateLintPass<'tcx> for ByteCount { cx, NAIVE_BYTECOUNT, expr.span, - "You appear to be counting bytes the naive way", - "Consider using the bytecount crate", + "you appear to be counting bytes the naive way", + "consider using the bytecount crate", format!("bytecount::count({}, {})", snippet_with_applicability(cx, haystack.span, "..", &mut applicability), snippet_with_applicability(cx, needle.span, "..", &mut applicability)), diff --git a/src/tools/clippy/clippy_lints/src/checked_conversions.rs b/src/tools/clippy/clippy_lints/src/checked_conversions.rs index 841902943f0..28c1a54d2c5 100644 --- a/src/tools/clippy/clippy_lints/src/checked_conversions.rs +++ b/src/tools/clippy/clippy_lints/src/checked_conversions.rs @@ -66,7 +66,7 @@ impl<'tcx> LateLintPass<'tcx> for CheckedConversions { cx, CHECKED_CONVERSIONS, item.span, - "Checked cast can be simplified.", + "checked cast can be simplified", "try", format!("{}::try_from({}).is_ok()", to_type, snippet), applicability, diff --git a/src/tools/clippy/clippy_lints/src/default_trait_access.rs b/src/tools/clippy/clippy_lints/src/default_trait_access.rs index ea244768129..874e19d9e9f 100644 --- a/src/tools/clippy/clippy_lints/src/default_trait_access.rs +++ b/src/tools/clippy/clippy_lints/src/default_trait_access.rs @@ -61,7 +61,7 @@ impl<'tcx> LateLintPass<'tcx> for DefaultTraitAccess { cx, DEFAULT_TRAIT_ACCESS, expr.span, - &format!("Calling `{}` is more clear than this expression", replacement), + &format!("calling `{}` is more clear than this expression", replacement), "try", replacement, Applicability::Unspecified, // First resolve the TODO above diff --git a/src/tools/clippy/clippy_lints/src/derive.rs b/src/tools/clippy/clippy_lints/src/derive.rs index 59c62f1ae94..80a06758982 100644 --- a/src/tools/clippy/clippy_lints/src/derive.rs +++ b/src/tools/clippy/clippy_lints/src/derive.rs @@ -1,6 +1,7 @@ use crate::utils::paths; use crate::utils::{ - is_automatically_derived, is_copy, match_path, span_lint_and_help, span_lint_and_note, span_lint_and_then, + get_trait_def_id, is_allowed, is_automatically_derived, is_copy, match_path, span_lint_and_help, + span_lint_and_note, span_lint_and_then, }; use if_chain::if_chain; use rustc_hir::def_id::DefId; @@ -43,6 +44,57 @@ declare_clippy_lint! { "deriving `Hash` but implementing `PartialEq` explicitly" } +declare_clippy_lint! { + /// **What it does:** Checks for deriving `Ord` but implementing `PartialOrd` + /// explicitly or vice versa. + /// + /// **Why is this bad?** The implementation of these traits must agree (for + /// example for use with `sort`) so it’s probably a bad idea to use a + /// default-generated `Ord` implementation with an explicitly defined + /// `PartialOrd`. In particular, the following must hold for any type + /// implementing `Ord`: + /// + /// ```text + /// k1.cmp(&k2) == k1.partial_cmp(&k2).unwrap() + /// ``` + /// + /// **Known problems:** None. + /// + /// **Example:** + /// + /// ```rust,ignore + /// #[derive(Ord, PartialEq, Eq)] + /// struct Foo; + /// + /// impl PartialOrd for Foo { + /// ... + /// } + /// ``` + /// Use instead: + /// ```rust,ignore + /// #[derive(PartialEq, Eq)] + /// struct Foo; + /// + /// impl PartialOrd for Foo { + /// fn partial_cmp(&self, other: &Foo) -> Option { + /// Some(self.cmp(other)) + /// } + /// } + /// + /// impl Ord for Foo { + /// ... + /// } + /// ``` + /// or, if you don't need a custom ordering: + /// ```rust,ignore + /// #[derive(Ord, PartialOrd, PartialEq, Eq)] + /// struct Foo; + /// ``` + pub DERIVE_ORD_XOR_PARTIAL_ORD, + correctness, + "deriving `Ord` but implementing `PartialOrd` explicitly" +} + declare_clippy_lint! { /// **What it does:** Checks for explicit `Clone` implementations for `Copy` /// types. @@ -103,7 +155,12 @@ declare_clippy_lint! { "deriving `serde::Deserialize` on a type that has methods using `unsafe`" } -declare_lint_pass!(Derive => [EXPL_IMPL_CLONE_ON_COPY, DERIVE_HASH_XOR_EQ, UNSAFE_DERIVE_DESERIALIZE]); +declare_lint_pass!(Derive => [ + EXPL_IMPL_CLONE_ON_COPY, + DERIVE_HASH_XOR_EQ, + DERIVE_ORD_XOR_PARTIAL_ORD, + UNSAFE_DERIVE_DESERIALIZE +]); impl<'tcx> LateLintPass<'tcx> for Derive { fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) { @@ -116,6 +173,7 @@ impl<'tcx> LateLintPass<'tcx> for Derive { let is_automatically_derived = is_automatically_derived(&*item.attrs); check_hash_peq(cx, item.span, trait_ref, ty, is_automatically_derived); + check_ord_partial_ord(cx, item.span, trait_ref, ty, is_automatically_derived); if is_automatically_derived { check_unsafe_derive_deserialize(cx, item, trait_ref, ty); @@ -180,6 +238,60 @@ fn check_hash_peq<'tcx>( } } +/// Implementation of the `DERIVE_ORD_XOR_PARTIAL_ORD` lint. +fn check_ord_partial_ord<'tcx>( + cx: &LateContext<'tcx>, + span: Span, + trait_ref: &TraitRef<'_>, + ty: Ty<'tcx>, + ord_is_automatically_derived: bool, +) { + if_chain! { + if let Some(ord_trait_def_id) = get_trait_def_id(cx, &paths::ORD); + if let Some(partial_ord_trait_def_id) = cx.tcx.lang_items().partial_ord_trait(); + if let Some(def_id) = &trait_ref.trait_def_id(); + if *def_id == ord_trait_def_id; + then { + // Look for the PartialOrd implementations for `ty` + cx.tcx.for_each_relevant_impl(partial_ord_trait_def_id, ty, |impl_id| { + let partial_ord_is_automatically_derived = is_automatically_derived(&cx.tcx.get_attrs(impl_id)); + + if partial_ord_is_automatically_derived == ord_is_automatically_derived { + return; + } + + let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation"); + + // Only care about `impl PartialOrd for Foo` + // For `impl PartialOrd for A, input_types is [A, B] + if trait_ref.substs.type_at(1) == ty { + let mess = if partial_ord_is_automatically_derived { + "you are implementing `Ord` explicitly but have derived `PartialOrd`" + } else { + "you are deriving `Ord` but have implemented `PartialOrd` explicitly" + }; + + span_lint_and_then( + cx, + DERIVE_ORD_XOR_PARTIAL_ORD, + span, + mess, + |diag| { + if let Some(local_def_id) = impl_id.as_local() { + let hir_id = cx.tcx.hir().as_local_hir_id(local_def_id); + diag.span_note( + cx.tcx.hir().span(hir_id), + "`PartialOrd` implemented here" + ); + } + } + ); + } + }); + } + } +} + /// Implementation of the `EXPL_IMPL_CLONE_ON_COPY` lint. fn check_copy_clone<'tcx>(cx: &LateContext<'tcx>, item: &Item<'_>, trait_ref: &TraitRef<'_>, ty: Ty<'tcx>) { if match_path(&trait_ref.path, &paths::CLONE_TRAIT) { @@ -242,7 +354,9 @@ fn check_unsafe_derive_deserialize<'tcx>( if_chain! { if match_path(&trait_ref.path, &paths::SERDE_DESERIALIZE); if let ty::Adt(def, _) = ty.kind; - if def.did.is_local(); + if let Some(local_def_id) = def.did.as_local(); + let adt_hir_id = cx.tcx.hir().as_local_hir_id(local_def_id); + if !is_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id); if cx.tcx.inherent_impls(def.did) .iter() .map(|imp_did| item_from_def_id(cx, *imp_did)) diff --git a/src/tools/clippy/clippy_lints/src/double_comparison.rs b/src/tools/clippy/clippy_lints/src/double_comparison.rs index 5d16192b754..bae7c4647d4 100644 --- a/src/tools/clippy/clippy_lints/src/double_comparison.rs +++ b/src/tools/clippy/clippy_lints/src/double_comparison.rs @@ -60,7 +60,7 @@ impl<'tcx> DoubleComparisons { cx, DOUBLE_COMPARISONS, span, - "This binary expression can be simplified", + "this binary expression can be simplified", "try", sugg, applicability, diff --git a/src/tools/clippy/clippy_lints/src/double_parens.rs b/src/tools/clippy/clippy_lints/src/double_parens.rs index 1eb380a22cc..abbcaf43f41 100644 --- a/src/tools/clippy/clippy_lints/src/double_parens.rs +++ b/src/tools/clippy/clippy_lints/src/double_parens.rs @@ -45,15 +45,12 @@ impl EarlyLintPass for DoubleParens { return; } + let msg: &str = "consider removing unnecessary double parentheses"; + match expr.kind { ExprKind::Paren(ref in_paren) => match in_paren.kind { ExprKind::Paren(_) | ExprKind::Tup(_) => { - span_lint( - cx, - DOUBLE_PARENS, - expr.span, - "Consider removing unnecessary double parentheses", - ); + span_lint(cx, DOUBLE_PARENS, expr.span, &msg); }, _ => {}, }, @@ -61,12 +58,7 @@ impl EarlyLintPass for DoubleParens { if params.len() == 1 { let param = ¶ms[0]; if let ExprKind::Paren(_) = param.kind { - span_lint( - cx, - DOUBLE_PARENS, - param.span, - "Consider removing unnecessary double parentheses", - ); + span_lint(cx, DOUBLE_PARENS, param.span, &msg); } } }, @@ -74,12 +66,7 @@ impl EarlyLintPass for DoubleParens { if params.len() == 2 { let param = ¶ms[1]; if let ExprKind::Paren(_) = param.kind { - span_lint( - cx, - DOUBLE_PARENS, - param.span, - "Consider removing unnecessary double parentheses", - ); + span_lint(cx, DOUBLE_PARENS, param.span, &msg); } } }, diff --git a/src/tools/clippy/clippy_lints/src/drop_bounds.rs b/src/tools/clippy/clippy_lints/src/drop_bounds.rs index 4afbd1ed0e5..ec3b6afa630 100644 --- a/src/tools/clippy/clippy_lints/src/drop_bounds.rs +++ b/src/tools/clippy/clippy_lints/src/drop_bounds.rs @@ -33,11 +33,11 @@ declare_clippy_lint! { /// ``` pub DROP_BOUNDS, correctness, - "Bounds of the form `T: Drop` are useless" + "bounds of the form `T: Drop` are useless" } -const DROP_BOUNDS_SUMMARY: &str = "Bounds of the form `T: Drop` are useless. \ - Use `std::mem::needs_drop` to detect if a type has drop glue."; +const DROP_BOUNDS_SUMMARY: &str = "bounds of the form `T: Drop` are useless, \ + use `std::mem::needs_drop` to detect if a type has drop glue"; declare_lint_pass!(DropBounds => [DROP_BOUNDS]); diff --git a/src/tools/clippy/clippy_lints/src/functions.rs b/src/tools/clippy/clippy_lints/src/functions.rs index 6a141f1fc78..ac1c7aa9bbb 100644 --- a/src/tools/clippy/clippy_lints/src/functions.rs +++ b/src/tools/clippy/clippy_lints/src/functions.rs @@ -294,7 +294,8 @@ impl<'tcx> LateLintPass<'tcx> for Functions { let body = cx.tcx.hir().body(eid); Self::check_raw_ptr(cx, sig.header.unsafety, &sig.decl, body, item.hir_id); - if attr.is_none() && cx.access_levels.is_exported(item.hir_id) && !is_proc_macro(cx.sess(), &item.attrs) { + if attr.is_none() && cx.access_levels.is_exported(item.hir_id) && !is_proc_macro(cx.sess(), &item.attrs) + { check_must_use_candidate( cx, &sig.decl, @@ -373,7 +374,7 @@ impl<'tcx> Functions { } if line_count > self.max_lines { - span_lint(cx, TOO_MANY_LINES, span, "This function has a large number of lines.") + span_lint(cx, TOO_MANY_LINES, span, "this function has a large number of lines") } } diff --git a/src/tools/clippy/clippy_lints/src/lib.rs b/src/tools/clippy/clippy_lints/src/lib.rs index 828ee910596..6ad525d7620 100644 --- a/src/tools/clippy/clippy_lints/src/lib.rs +++ b/src/tools/clippy/clippy_lints/src/lib.rs @@ -250,6 +250,7 @@ mod mut_mut; mod mut_reference; mod mutable_debug_assertion; mod mutex_atomic; +mod needless_arbitrary_self_type; mod needless_bool; mod needless_borrow; mod needless_borrowed_ref; @@ -288,6 +289,7 @@ mod serde_api; mod shadow; mod single_component_path_imports; mod slow_vector_initialization; +mod stable_sort_primitive; mod strings; mod suspicious_trait_impl; mod swap; @@ -322,10 +324,6 @@ mod zero_div_zero; pub use crate::utils::conf::Conf; -mod reexport { - pub use rustc_span::Symbol as Name; -} - /// Register all pre expansion lints /// /// Pre-expansion lints run before any macro expansion has happened. @@ -513,6 +511,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &default_trait_access::DEFAULT_TRAIT_ACCESS, &dereference::EXPLICIT_DEREF_METHODS, &derive::DERIVE_HASH_XOR_EQ, + &derive::DERIVE_ORD_XOR_PARTIAL_ORD, &derive::EXPL_IMPL_CLONE_ON_COPY, &derive::UNSAFE_DERIVE_DESERIALIZE, &doc::DOC_MARKDOWN, @@ -610,6 +609,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &loops::NEEDLESS_COLLECT, &loops::NEEDLESS_RANGE_LOOP, &loops::NEVER_LOOP, + &loops::SAME_ITEM_PUSH, &loops::WHILE_IMMUTABLE_CONDITION, &loops::WHILE_LET_LOOP, &loops::WHILE_LET_ON_ITERATOR, @@ -719,6 +719,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &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_bool::BOOL_COMPARISON, &needless_bool::NEEDLESS_BOOL, &needless_borrow::NEEDLESS_BORROW, @@ -776,6 +777,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &shadow::SHADOW_UNRELATED, &single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS, &slow_vector_initialization::SLOW_VECTOR_INITIALIZATION, + &stable_sort_primitive::STABLE_SORT_PRIMITIVE, &strings::STRING_ADD, &strings::STRING_ADD_ASSIGN, &strings::STRING_LIT_AS_BYTES, @@ -786,6 +788,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: &tabs_in_doc_comments::TABS_IN_DOC_COMMENTS, &temporary_assignment::TEMPORARY_ASSIGNMENT, &to_digit_is_some::TO_DIGIT_IS_SOME, + &trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS, &trait_bounds::TYPE_REPETITION_IN_BOUNDS, &transmute::CROSSPOINTER_TRANSMUTE, &transmute::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS, @@ -1028,6 +1031,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_early_pass(|| box items_after_statements::ItemsAfterStatements); store.register_early_pass(|| box precedence::Precedence); store.register_early_pass(|| box needless_continue::NeedlessContinue); + store.register_early_pass(|| box needless_arbitrary_self_type::NeedlessArbitrarySelfType); store.register_early_pass(|| box redundant_static_lifetimes::RedundantStaticLifetimes); store.register_late_pass(|| box cargo_common_metadata::CargoCommonMetadata); store.register_late_pass(|| box multiple_crate_versions::MultipleCrateVersions); @@ -1079,6 +1083,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: store.register_late_pass(|| box macro_use::MacroUseImports::default()); store.register_late_pass(|| box map_identity::MapIdentity); store.register_late_pass(|| box pattern_type_mismatch::PatternTypeMismatch); + store.register_late_pass(|| box stable_sort_primitive::StableSortPrimitive); store.register_late_pass(|| box repeat_once::RepeatOnce); store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![ @@ -1175,6 +1180,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&ranges::RANGE_PLUS_ONE), LintId::of(&shadow::SHADOW_UNRELATED), LintId::of(&strings::STRING_ADD_ASSIGN), + LintId::of(&trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS), LintId::of(&trait_bounds::TYPE_REPETITION_IN_BOUNDS), LintId::of(&trivially_copy_pass_by_ref::TRIVIALLY_COPY_PASS_BY_REF), LintId::of(&types::CAST_LOSSLESS), @@ -1231,6 +1237,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&copies::IFS_SAME_COND), LintId::of(&copies::IF_SAME_THEN_ELSE), LintId::of(&derive::DERIVE_HASH_XOR_EQ), + LintId::of(&derive::DERIVE_ORD_XOR_PARTIAL_ORD), LintId::of(&doc::MISSING_SAFETY_DOC), LintId::of(&doc::NEEDLESS_DOCTEST_MAIN), LintId::of(&double_comparison::DOUBLE_COMPARISONS), @@ -1293,6 +1300,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: 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::WHILE_IMMUTABLE_CONDITION), LintId::of(&loops::WHILE_LET_LOOP), LintId::of(&loops::WHILE_LET_ON_ITERATOR), @@ -1369,6 +1377,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&mut_key::MUTABLE_KEY_TYPE), LintId::of(&mut_reference::UNNECESSARY_MUT_PASSED), LintId::of(&mutex_atomic::MUTEX_ATOMIC), + 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), @@ -1409,6 +1418,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&serde_api::SERDE_API_MISUSE), LintId::of(&single_component_path_imports::SINGLE_COMPONENT_PATH_IMPORTS), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), + LintId::of(&stable_sort_primitive::STABLE_SORT_PRIMITIVE), LintId::of(&strings::STRING_LIT_AS_BYTES), LintId::of(&suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL), LintId::of(&suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL), @@ -1495,6 +1505,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&loops::EMPTY_LOOP), LintId::of(&loops::FOR_KV_MAP), LintId::of(&loops::NEEDLESS_RANGE_LOOP), + LintId::of(&loops::SAME_ITEM_PUSH), LintId::of(&loops::WHILE_LET_ON_ITERATOR), LintId::of(&main_recursion::MAIN_RECURSION), LintId::of(&manual_async_fn::MANUAL_ASYNC_FN), @@ -1600,6 +1611,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: 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), @@ -1651,6 +1663,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&copies::IFS_SAME_COND), LintId::of(&copies::IF_SAME_THEN_ELSE), LintId::of(&derive::DERIVE_HASH_XOR_EQ), + LintId::of(&derive::DERIVE_ORD_XOR_PARTIAL_ORD), LintId::of(&drop_bounds::DROP_BOUNDS), LintId::of(&drop_forget_ref::DROP_COPY), LintId::of(&drop_forget_ref::DROP_REF), @@ -1726,6 +1739,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf: LintId::of(&mutex_atomic::MUTEX_ATOMIC), LintId::of(&redundant_clone::REDUNDANT_CLONE), LintId::of(&slow_vector_initialization::SLOW_VECTOR_INITIALIZATION), + LintId::of(&stable_sort_primitive::STABLE_SORT_PRIMITIVE), LintId::of(&types::BOX_VEC), LintId::of(&types::REDUNDANT_ALLOCATION), LintId::of(&vec::USELESS_VEC), diff --git a/src/tools/clippy/clippy_lints/src/lifetimes.rs b/src/tools/clippy/clippy_lints/src/lifetimes.rs index 168f9f953e4..4df6827d77f 100644 --- a/src/tools/clippy/clippy_lints/src/lifetimes.rs +++ b/src/tools/clippy/clippy_lints/src/lifetimes.rs @@ -13,9 +13,8 @@ use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::hir::map::Map; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; -use rustc_span::symbol::kw; +use rustc_span::symbol::{kw, Symbol}; -use crate::reexport::Name; use crate::utils::{in_macro, last_path_segment, span_lint, trait_ref_of_method}; declare_clippy_lint! { @@ -113,7 +112,7 @@ impl<'tcx> LateLintPass<'tcx> for Lifetimes { enum RefLt { Unnamed, Static, - Named(Name), + Named(Symbol), } fn check_fn_inner<'tcx>( @@ -456,7 +455,7 @@ fn has_where_lifetimes<'tcx>(cx: &LateContext<'tcx>, where_clause: &'tcx WhereCl } struct LifetimeChecker { - map: FxHashMap, + map: FxHashMap, } impl<'tcx> Visitor<'tcx> for LifetimeChecker { diff --git a/src/tools/clippy/clippy_lints/src/loops.rs b/src/tools/clippy/clippy_lints/src/loops.rs index 7e3876ff49b..8352a8a3d2c 100644 --- a/src/tools/clippy/clippy_lints/src/loops.rs +++ b/src/tools/clippy/clippy_lints/src/loops.rs @@ -1,14 +1,14 @@ use crate::consts::constant; -use crate::reexport::Name; use crate::utils::paths; +use crate::utils::sugg::Sugg; use crate::utils::usage::{is_unused, mutated_variables}; use crate::utils::{ get_enclosing_block, get_parent_expr, get_trait_def_id, has_iter_method, higher, implements_trait, - is_integer_const, is_no_std_crate, is_refutable, last_path_segment, match_trait_method, match_type, match_var, - multispan_sugg, snippet, snippet_opt, snippet_with_applicability, span_lint, span_lint_and_help, - span_lint_and_sugg, span_lint_and_then, SpanlessEq, + is_integer_const, is_no_std_crate, is_refutable, is_type_diagnostic_item, last_path_segment, match_trait_method, + match_type, match_var, multispan_sugg, qpath_res, snippet, snippet_opt, snippet_with_applicability, + snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, sugg, + SpanlessEq, }; -use crate::utils::{is_type_diagnostic_item, qpath_res, sugg}; use if_chain::if_chain; use rustc_ast::ast; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; @@ -17,7 +17,7 @@ use rustc_hir::def::{DefKind, Res}; use rustc_hir::intravisit::{walk_block, walk_expr, walk_pat, walk_stmt, NestedVisitorMap, Visitor}; use rustc_hir::{ def_id, BinOpKind, BindingAnnotation, Block, BorrowKind, Expr, ExprKind, GenericArg, HirId, InlineAsmOperand, - LoopSource, MatchSource, Mutability, Node, Pat, PatKind, QPath, Stmt, StmtKind, + Local, LoopSource, MatchSource, Mutability, Node, Pat, PatKind, QPath, Stmt, StmtKind, }; use rustc_infer::infer::TyCtxtInferExt; use rustc_lint::{LateContext, LateLintPass, LintContext}; @@ -27,7 +27,7 @@ use rustc_middle::middle::region; use rustc_middle::ty::{self, Ty, TyS}; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; -use rustc_span::symbol::Symbol; +use rustc_span::symbol::{sym, Ident, Symbol}; use rustc_typeck::expr_use_visitor::{ConsumeMode, Delegate, ExprUseVisitor, PlaceBase, PlaceWithHirId}; use std::iter::{once, Iterator}; use std::mem; @@ -420,6 +420,39 @@ declare_clippy_lint! { "variables used within while expression are not mutated in the body" } +declare_clippy_lint! { + /// **What it does:** Checks whether a for loop is being used to push a constant + /// value into a Vec. + /// + /// **Why is this bad?** This kind of operation can be expressed more succinctly with + /// `vec![item;SIZE]` or `vec.resize(NEW_SIZE, item)` and using these alternatives may also + /// have better performance. + /// **Known problems:** None + /// + /// **Example:** + /// ```rust + /// let item1 = 2; + /// let item2 = 3; + /// let mut vec: Vec = Vec::new(); + /// for _ in 0..20 { + /// vec.push(item1); + /// } + /// for _ in 0..30 { + /// vec.push(item2); + /// } + /// ``` + /// could be written as + /// ```rust + /// let item1 = 2; + /// let item2 = 3; + /// let mut vec: Vec = vec![item1; 20]; + /// vec.resize(20 + 30, item2); + /// ``` + pub SAME_ITEM_PUSH, + style, + "the same item is pushed inside of a for loop" +} + declare_lint_pass!(Loops => [ MANUAL_MEMCPY, NEEDLESS_RANGE_LOOP, @@ -436,6 +469,7 @@ declare_lint_pass!(Loops => [ NEVER_LOOP, MUT_RANGE_BOUND, WHILE_IMMUTABLE_CONDITION, + SAME_ITEM_PUSH, ]); impl<'tcx> LateLintPass<'tcx> for Loops { @@ -741,6 +775,7 @@ fn check_for_loop<'tcx>( check_for_loop_over_map_kv(cx, pat, arg, body, expr); check_for_mut_range_bound(cx, arg, body); detect_manual_memcpy(cx, pat, arg, body, expr); + detect_same_item_push(cx, pat, arg, body, expr); } fn same_var<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>, var: HirId) -> bool { @@ -1017,6 +1052,117 @@ fn detect_manual_memcpy<'tcx>( } } +// Scans the body of the for loop and determines whether lint should be given +struct SameItemPushVisitor<'a, 'tcx> { + should_lint: bool, + // this field holds the last vec push operation visited, which should be the only push seen + vec_push: Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)>, + cx: &'a LateContext<'tcx>, +} + +impl<'a, 'tcx> Visitor<'tcx> for SameItemPushVisitor<'a, 'tcx> { + type Map = Map<'tcx>; + + fn visit_expr(&mut self, expr: &'tcx Expr<'_>) { + match &expr.kind { + // Non-determinism may occur ... don't give a lint + ExprKind::Loop(_, _, _) | ExprKind::Match(_, _, _) => self.should_lint = false, + ExprKind::Block(block, _) => self.visit_block(block), + _ => {}, + } + } + + fn visit_block(&mut self, b: &'tcx Block<'_>) { + for stmt in b.stmts.iter() { + self.visit_stmt(stmt); + } + } + + fn visit_stmt(&mut self, s: &'tcx Stmt<'_>) { + let vec_push_option = get_vec_push(self.cx, s); + if vec_push_option.is_none() { + // Current statement is not a push so visit inside + match &s.kind { + StmtKind::Expr(expr) | StmtKind::Semi(expr) => self.visit_expr(&expr), + _ => {}, + } + } else { + // Current statement is a push ...check whether another + // push had been previously done + if self.vec_push.is_none() { + self.vec_push = vec_push_option; + } else { + // There are multiple pushes ... don't lint + self.should_lint = false; + } + } + } + + fn nested_visit_map(&mut self) -> NestedVisitorMap { + NestedVisitorMap::None + } +} + +// Given some statement, determine if that statement is a push on a Vec. If it is, return +// the Vec being pushed into and the item being pushed +fn get_vec_push<'tcx>(cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>)> { + if_chain! { + // Extract method being called + if let StmtKind::Semi(semi_stmt) = &stmt.kind; + if let ExprKind::MethodCall(path, _, args, _) = &semi_stmt.kind; + // Figure out the parameters for the method call + if let Some(self_expr) = args.get(0); + if let Some(pushed_item) = args.get(1); + // Check that the method being called is push() on a Vec + if match_type(cx, cx.typeck_results().expr_ty(self_expr), &paths::VEC); + if path.ident.name.as_str() == "push"; + then { + return Some((self_expr, pushed_item)) + } + } + None +} + +/// Detects for loop pushing the same item into a Vec +fn detect_same_item_push<'tcx>( + cx: &LateContext<'tcx>, + pat: &'tcx Pat<'_>, + _: &'tcx Expr<'_>, + body: &'tcx Expr<'_>, + _: &'tcx Expr<'_>, +) { + // Determine whether it is safe to lint the body + let mut same_item_push_visitor = SameItemPushVisitor { + should_lint: true, + vec_push: None, + cx, + }; + walk_expr(&mut same_item_push_visitor, body); + if same_item_push_visitor.should_lint { + if let Some((vec, pushed_item)) = same_item_push_visitor.vec_push { + // Make sure that the push does not involve possibly mutating values + if mutated_variables(pushed_item, cx).map_or(false, |mutvars| mutvars.is_empty()) { + if let PatKind::Wild = pat.kind { + let vec_str = snippet_with_macro_callsite(cx, vec.span, ""); + let item_str = snippet_with_macro_callsite(cx, pushed_item.span, ""); + + span_lint_and_help( + cx, + SAME_ITEM_PUSH, + vec.span, + "it looks like the same item is being pushed into this Vec", + None, + &format!( + "try using vec![{};SIZE] or {}.resize(NEW_SIZE, {})", + item_str, vec_str, item_str + ), + ) + } + } + } + } +} + /// Checks for looping over a range and then indexing a sequence with it. /// The iteratee must be a range literal. #[allow(clippy::too_many_lines)] @@ -1184,7 +1330,7 @@ fn check_for_loop_range<'tcx>( } } -fn is_len_call(expr: &Expr<'_>, var: Name) -> bool { +fn is_len_call(expr: &Expr<'_>, var: Symbol) -> bool { if_chain! { if let ExprKind::MethodCall(ref method, _, ref len_args, _) = expr.kind; if len_args.len() == 1; @@ -1640,15 +1786,15 @@ struct VarVisitor<'a, 'tcx> { /// var name to look for as index var: HirId, /// indexed variables that are used mutably - indexed_mut: FxHashSet, + indexed_mut: FxHashSet, /// indirectly indexed variables (`v[(i + 4) % N]`), the extend is `None` for global - indexed_indirectly: FxHashMap>, + indexed_indirectly: FxHashMap>, /// subset of `indexed` of vars that are indexed directly: `v[i]` /// this will not contain cases like `v[calc_index(i)]` or `v[(i + 4) % N]` - indexed_directly: FxHashMap, Ty<'tcx>)>, + indexed_directly: FxHashMap, Ty<'tcx>)>, /// Any names that are used outside an index operation. /// Used to detect things like `&mut vec` used together with `vec[i]` - referenced: FxHashSet, + referenced: FxHashSet, /// has the loop variable been used in expressions other than the index of /// an index op? nonindex: bool, @@ -2004,7 +2150,7 @@ struct InitializeVisitor<'a, 'tcx> { end_expr: &'tcx Expr<'tcx>, // the for loop. Stop scanning here. var_id: HirId, state: VarState, - name: Option, + name: Option, depth: u32, // depth of conditional expressions past_loop: bool, } @@ -2167,7 +2313,7 @@ use self::Nesting::{LookFurther, RuledOut, Unknown}; struct LoopNestVisitor { hir_id: HirId, - iterator: Name, + iterator: Symbol, nesting: Nesting, } @@ -2218,7 +2364,7 @@ impl<'tcx> Visitor<'tcx> for LoopNestVisitor { } } -fn path_name(e: &Expr<'_>) -> Option { +fn path_name(e: &Expr<'_>) -> Option { if let ExprKind::Path(QPath::Resolved(_, ref path)) = e.kind { let segments = &path.segments; if segments.len() == 1 { @@ -2358,6 +2504,10 @@ impl<'a, 'tcx> Visitor<'tcx> for VarCollectorVisitor<'a, 'tcx> { const NEEDLESS_COLLECT_MSG: &str = "avoid using `collect()` when not needed"; fn check_needless_collect<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { + check_needless_collect_direct_usage(expr, cx); + check_needless_collect_indirect_usage(expr, cx); +} +fn check_needless_collect_direct_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { if_chain! { if let ExprKind::MethodCall(ref method, _, ref args, _) = expr.kind; if let ExprKind::MethodCall(ref chain_method, _, _, _) = args[0].kind; @@ -2371,7 +2521,7 @@ fn check_needless_collect<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { match_type(cx, ty, &paths::BTREEMAP) || is_type_diagnostic_item(cx, ty, sym!(hashmap_type)) { if method.ident.name == sym!(len) { - let span = shorten_span(expr, sym!(collect)); + let span = shorten_needless_collect_span(expr); span_lint_and_sugg( cx, NEEDLESS_COLLECT, @@ -2383,20 +2533,20 @@ fn check_needless_collect<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { ); } if method.ident.name == sym!(is_empty) { - let span = shorten_span(expr, sym!(iter)); + let span = shorten_needless_collect_span(expr); span_lint_and_sugg( cx, NEEDLESS_COLLECT, span, NEEDLESS_COLLECT_MSG, "replace with", - "get(0).is_none()".to_string(), + "next().is_none()".to_string(), Applicability::MachineApplicable, ); } if method.ident.name == sym!(contains) { let contains_arg = snippet(cx, args[1].span, "??"); - let span = shorten_span(expr, sym!(collect)); + let span = shorten_needless_collect_span(expr); span_lint_and_then( cx, NEEDLESS_COLLECT, @@ -2425,13 +2575,164 @@ fn check_needless_collect<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { } } -fn shorten_span(expr: &Expr<'_>, target_fn_name: Symbol) -> Span { - let mut current_expr = expr; - while let ExprKind::MethodCall(ref path, ref span, ref args, _) = current_expr.kind { - if path.ident.name == target_fn_name { +fn check_needless_collect_indirect_usage<'tcx>(expr: &'tcx Expr<'_>, cx: &LateContext<'tcx>) { + if let ExprKind::Block(ref block, _) = expr.kind { + for ref stmt in block.stmts { + if_chain! { + if let StmtKind::Local( + Local { pat: Pat { kind: PatKind::Binding(_, _, ident, .. ), .. }, + init: Some(ref init_expr), .. } + ) = stmt.kind; + if let ExprKind::MethodCall(ref method_name, _, &[ref iter_source], ..) = init_expr.kind; + if method_name.ident.name == sym!(collect) && match_trait_method(cx, &init_expr, &paths::ITERATOR); + if let Some(ref generic_args) = method_name.args; + if let Some(GenericArg::Type(ref ty)) = generic_args.args.get(0); + if let ty = cx.typeck_results().node_type(ty.hir_id); + if is_type_diagnostic_item(cx, ty, sym::vec_type) || + is_type_diagnostic_item(cx, ty, sym!(vecdeque_type)) || + match_type(cx, ty, &paths::LINKED_LIST); + if let Some(iter_calls) = detect_iter_and_into_iters(block, *ident); + if iter_calls.len() == 1; + then { + // Suggest replacing iter_call with iter_replacement, and removing stmt + let iter_call = &iter_calls[0]; + span_lint_and_then( + cx, + NEEDLESS_COLLECT, + stmt.span.until(iter_call.span), + NEEDLESS_COLLECT_MSG, + |diag| { + let iter_replacement = format!("{}{}", Sugg::hir(cx, iter_source, ".."), iter_call.get_iter_method(cx)); + diag.multipart_suggestion( + iter_call.get_suggestion_text(), + vec![ + (stmt.span, String::new()), + (iter_call.span, iter_replacement) + ], + Applicability::MachineApplicable,// MaybeIncorrect, + ).emit(); + }, + ); + } + } + } + } +} + +struct IterFunction { + func: IterFunctionKind, + span: Span, +} +impl IterFunction { + fn get_iter_method(&self, cx: &LateContext<'_>) -> String { + match &self.func { + IterFunctionKind::IntoIter => String::new(), + IterFunctionKind::Len => String::from(".count()"), + IterFunctionKind::IsEmpty => String::from(".next().is_none()"), + IterFunctionKind::Contains(span) => format!(".any(|x| x == {})", snippet(cx, *span, "..")), + } + } + fn get_suggestion_text(&self) -> &'static str { + match &self.func { + IterFunctionKind::IntoIter => { + "Use the original Iterator instead of collecting it and then producing a new one" + }, + IterFunctionKind::Len => { + "Take the original Iterator's count instead of collecting it and finding the length" + }, + IterFunctionKind::IsEmpty => { + "Check if the original Iterator has anything instead of collecting it and seeing if it's empty" + }, + IterFunctionKind::Contains(_) => { + "Check if the original Iterator contains an element instead of collecting then checking" + }, + } + } +} +enum IterFunctionKind { + IntoIter, + Len, + IsEmpty, + Contains(Span), +} + +struct IterFunctionVisitor { + uses: Vec, + seen_other: bool, + target: Ident, +} +impl<'tcx> Visitor<'tcx> for IterFunctionVisitor { + fn visit_expr(&mut self, expr: &'tcx Expr<'tcx>) { + // Check function calls on our collection + if_chain! { + if let ExprKind::MethodCall(method_name, _, ref args, _) = &expr.kind; + if let Some(Expr { kind: ExprKind::Path(QPath::Resolved(_, ref path)), .. }) = args.get(0); + if let &[name] = &path.segments; + if name.ident == self.target; + then { + let len = sym!(len); + let is_empty = sym!(is_empty); + let contains = sym!(contains); + match method_name.ident.name { + sym::into_iter => self.uses.push( + IterFunction { func: IterFunctionKind::IntoIter, span: expr.span } + ), + name if name == len => self.uses.push( + IterFunction { func: IterFunctionKind::Len, span: expr.span } + ), + name if name == is_empty => self.uses.push( + IterFunction { func: IterFunctionKind::IsEmpty, span: expr.span } + ), + name if name == contains => self.uses.push( + IterFunction { func: IterFunctionKind::Contains(args[1].span), span: expr.span } + ), + _ => self.seen_other = true, + } + return + } + } + // Check if the collection is used for anything else + if_chain! { + if let Expr { kind: ExprKind::Path(QPath::Resolved(_, ref path)), .. } = expr; + if let &[name] = &path.segments; + if name.ident == self.target; + then { + self.seen_other = true; + } else { + walk_expr(self, expr); + } + } + } + + type Map = Map<'tcx>; + fn nested_visit_map(&mut self) -> NestedVisitorMap { + NestedVisitorMap::None + } +} + +/// Detect the occurences of calls to `iter` or `into_iter` for the +/// given identifier +fn detect_iter_and_into_iters<'tcx>(block: &'tcx Block<'tcx>, identifier: Ident) -> Option> { + let mut visitor = IterFunctionVisitor { + uses: Vec::new(), + target: identifier, + seen_other: false, + }; + visitor.visit_block(block); + if visitor.seen_other { + None + } else { + Some(visitor.uses) + } +} + +fn shorten_needless_collect_span(expr: &Expr<'_>) -> Span { + if_chain! { + if let ExprKind::MethodCall(.., args, _) = &expr.kind; + if let ExprKind::MethodCall(_, span, ..) = &args[0].kind; + then { return expr.span.with_lo(span.lo()); } - current_expr = &args[0]; } - unreachable!() + unreachable!(); } diff --git a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs index c19fb148cda..864d1ea87f5 100644 --- a/src/tools/clippy/clippy_lints/src/manual_async_fn.rs +++ b/src/tools/clippy/clippy_lints/src/manual_async_fn.rs @@ -4,8 +4,8 @@ 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, GenericBound, HirId, IsAsync, - ItemKind, TraitRef, Ty, TyKind, TypeBindingKind, + AsyncGeneratorKind, Block, Body, Expr, ExprKind, FnDecl, FnRetTy, GeneratorKind, GenericArg, GenericBound, HirId, + IsAsync, ItemKind, LifetimeName, TraitRef, Ty, TyKind, TypeBindingKind, }; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; @@ -27,8 +27,6 @@ declare_clippy_lint! { /// ``` /// Use instead: /// ```rust - /// use std::future::Future; - /// /// async fn foo() -> i32 { 42 } /// ``` pub MANUAL_ASYNC_FN, @@ -53,8 +51,9 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn { if let IsAsync::NotAsync = header.asyncness; // Check that this function returns `impl Future` if let FnRetTy::Return(ret_ty) = decl.output; - if let Some(trait_ref) = future_trait_ref(cx, ret_ty); + 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(); @@ -97,16 +96,35 @@ impl<'tcx> LateLintPass<'tcx> for ManualAsyncFn { } } -fn future_trait_ref<'tcx>(cx: &LateContext<'tcx>, ty: &'tcx Ty<'tcx>) -> Option<&'tcx TraitRef<'tcx>> { +fn future_trait_ref<'tcx>( + cx: &LateContext<'tcx>, + ty: &'tcx Ty<'tcx>, +) -> Option<(&'tcx TraitRef<'tcx>, Vec)> { if_chain! { - if let TyKind::OpaqueDef(item_id, _) = ty.kind; + if let TyKind::OpaqueDef(item_id, bounds) = ty.kind; let item = cx.tcx.hir().item(item_id.id); if let ItemKind::OpaqueTy(opaque) = &item.kind; - if opaque.bounds.len() == 1; - if let GenericBound::Trait(poly, _) = &opaque.bounds[0]; - if poly.trait_ref.trait_def_id() == cx.tcx.lang_items().future_trait(); + 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 { - return Some(&poly.trait_ref); + 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)); } } @@ -129,6 +147,29 @@ fn future_output_ty<'tcx>(trait_ref: &'tcx TraitRef<'tcx>) -> Option<&'tcx Ty<'t None } +fn captures_all_lifetimes(inputs: &[Ty<'_>], output_lifetimes: &[LifetimeName]) -> bool { + let input_lifetimes: Vec = 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; diff --git a/src/tools/clippy/clippy_lints/src/methods/mod.rs b/src/tools/clippy/clippy_lints/src/methods/mod.rs index 2c70183d876..570ae66d595 100644 --- a/src/tools/clippy/clippy_lints/src/methods/mod.rs +++ b/src/tools/clippy/clippy_lints/src/methods/mod.rs @@ -1052,8 +1052,7 @@ declare_clippy_lint! { /// /// **Why is this bad?** Readability. /// - /// **Known problems:** False positive in pattern guards. Will be resolved once - /// non-lexical lifetimes are stable. + /// **Known problems:** None. /// /// **Example:** /// ```rust @@ -1408,7 +1407,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods { ["nth", "iter_mut"] => lint_iter_nth(cx, expr, &arg_lists, true), ["nth", ..] => lint_iter_nth_zero(cx, expr, arg_lists[0]), ["step_by", ..] => lint_step_by(cx, expr, arg_lists[0]), - ["next", "skip"] => lint_iter_skip_next(cx, expr), + ["next", "skip"] => lint_iter_skip_next(cx, expr, arg_lists[1]), ["collect", "cloned"] => lint_iter_cloned_collect(cx, expr, arg_lists[1]), ["as_ref"] => lint_asref(cx, expr, "as_ref", arg_lists[0]), ["as_mut"] => lint_asref(cx, expr, "as_mut", arg_lists[0]), @@ -2433,17 +2432,21 @@ fn lint_get_unwrap<'tcx>(cx: &LateContext<'tcx>, expr: &hir::Expr<'_>, get_args: ); } -fn lint_iter_skip_next(cx: &LateContext<'_>, expr: &hir::Expr<'_>) { +fn lint_iter_skip_next(cx: &LateContext<'_>, expr: &hir::Expr<'_>, skip_args: &[hir::Expr<'_>]) { // lint if caller of skip is an Iterator if match_trait_method(cx, expr, &paths::ITERATOR) { - span_lint_and_help( - cx, - ITER_SKIP_NEXT, - expr.span, - "called `skip(x).next()` on an iterator", - None, - "this is more succinctly expressed by calling `nth(x)`", - ); + if let [caller, n] = skip_args { + let hint = format!(".nth({})", snippet(cx, n.span, "..")); + span_lint_and_sugg( + cx, + ITER_SKIP_NEXT, + expr.span.trim_start(caller.span).unwrap(), + "called `skip(x).next()` on an iterator", + "use `nth` instead", + hint, + Applicability::MachineApplicable, + ); + } } } @@ -2565,17 +2568,34 @@ fn lint_ok_expect(cx: &LateContext<'_>, expr: &hir::Expr<'_>, ok_args: &[hir::Ex fn lint_map_flatten<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>, map_args: &'tcx [hir::Expr<'_>]) { // lint if caller of `.map().flatten()` is an Iterator if match_trait_method(cx, expr, &paths::ITERATOR) { - let msg = "called `map(..).flatten()` on an `Iterator`. \ - This is more succinctly expressed by calling `.flat_map(..)`"; - let self_snippet = snippet(cx, map_args[0].span, ".."); + let map_closure_ty = cx.typeck_results().expr_ty(&map_args[1]); + let is_map_to_option = match map_closure_ty.kind { + ty::Closure(_, _) | ty::FnDef(_, _) | ty::FnPtr(_) => { + let map_closure_sig = match map_closure_ty.kind { + ty::Closure(_, substs) => substs.as_closure().sig(), + _ => map_closure_ty.fn_sig(cx.tcx), + }; + let map_closure_return_ty = cx.tcx.erase_late_bound_regions(&map_closure_sig.output()); + is_type_diagnostic_item(cx, map_closure_return_ty, sym!(option_type)) + }, + _ => false, + }; + + let method_to_use = if is_map_to_option { + // `(...).map(...)` has type `impl Iterator> + "filter_map" + } else { + // `(...).map(...)` has type `impl Iterator> + "flat_map" + }; let func_snippet = snippet(cx, map_args[1].span, ".."); - let hint = format!("{0}.flat_map({1})", self_snippet, func_snippet); + let hint = format!(".{0}({1})", method_to_use, func_snippet); span_lint_and_sugg( cx, MAP_FLATTEN, - expr.span, - msg, - "try using `flat_map` instead", + expr.span.with_lo(map_args[0].span.hi()), + "called `map(..).flatten()` on an `Iterator`", + &format!("try using `{}` instead", method_to_use), hint, Applicability::MachineApplicable, ); @@ -2583,16 +2603,13 @@ fn lint_map_flatten<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>, map // lint if caller of `.map().flatten()` is an Option if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(&map_args[0]), sym!(option_type)) { - let msg = "called `map(..).flatten()` on an `Option`. \ - This is more succinctly expressed by calling `.and_then(..)`"; - let self_snippet = snippet(cx, map_args[0].span, ".."); let func_snippet = snippet(cx, map_args[1].span, ".."); - let hint = format!("{0}.and_then({1})", self_snippet, func_snippet); + let hint = format!(".and_then({})", func_snippet); span_lint_and_sugg( cx, MAP_FLATTEN, - expr.span, - msg, + expr.span.with_lo(map_args[0].span.hi()), + "called `map(..).flatten()` on an `Option`", "try using `and_then` instead", hint, Applicability::MachineApplicable, diff --git a/src/tools/clippy/clippy_lints/src/minmax.rs b/src/tools/clippy/clippy_lints/src/minmax.rs index dae39aaf5e2..004dd50a31b 100644 --- a/src/tools/clippy/clippy_lints/src/minmax.rs +++ b/src/tools/clippy/clippy_lints/src/minmax.rs @@ -1,5 +1,6 @@ use crate::consts::{constant_simple, Constant}; -use crate::utils::{match_def_path, paths, span_lint}; +use crate::utils::{match_def_path, match_trait_method, paths, span_lint}; +use if_chain::if_chain; use rustc_hir::{Expr, ExprKind}; use rustc_lint::{LateContext, LateLintPass}; use rustc_session::{declare_lint_pass, declare_tool_lint}; @@ -18,6 +19,10 @@ declare_clippy_lint! { /// ```ignore /// min(0, max(100, x)) /// ``` + /// or + /// ```ignore + /// x.max(100).min(0) + /// ``` /// It will always be equal to `0`. Probably the author meant to clamp the value /// between 0 and 100, but has erroneously swapped `min` and `max`. pub MIN_MAX, @@ -60,25 +65,43 @@ enum MinMax { } fn min_max<'a>(cx: &LateContext<'_>, expr: &'a Expr<'a>) -> Option<(MinMax, Constant, &'a Expr<'a>)> { - if let ExprKind::Call(ref path, ref args) = expr.kind { - if let ExprKind::Path(ref qpath) = path.kind { - cx.typeck_results() - .qpath_res(qpath, path.hir_id) - .opt_def_id() - .and_then(|def_id| { - if match_def_path(cx, def_id, &paths::CMP_MIN) { - fetch_const(cx, args, MinMax::Min) - } else if match_def_path(cx, def_id, &paths::CMP_MAX) { + match expr.kind { + ExprKind::Call(ref path, ref args) => { + if let ExprKind::Path(ref qpath) = path.kind { + cx.typeck_results() + .qpath_res(qpath, path.hir_id) + .opt_def_id() + .and_then(|def_id| { + if match_def_path(cx, def_id, &paths::CMP_MIN) { + fetch_const(cx, args, MinMax::Min) + } else if match_def_path(cx, def_id, &paths::CMP_MAX) { + fetch_const(cx, args, MinMax::Max) + } else { + None + } + }) + } else { + None + } + }, + ExprKind::MethodCall(ref path, _, ref args, _) => { + if_chain! { + if let [obj, _] = args; + if cx.typeck_results().expr_ty(obj).is_floating_point() || match_trait_method(cx, expr, &paths::ORD); + then { + if path.ident.as_str() == sym!(max).as_str() { fetch_const(cx, args, MinMax::Max) + } else if path.ident.as_str() == sym!(min).as_str() { + fetch_const(cx, args, MinMax::Min) } else { None } - }) - } else { - None - } - } else { - None + } else { + None + } + } + }, + _ => None, } } diff --git a/src/tools/clippy/clippy_lints/src/misc_early.rs b/src/tools/clippy/clippy_lints/src/misc_early.rs index 29aba7c1218..02789735c17 100644 --- a/src/tools/clippy/clippy_lints/src/misc_early.rs +++ b/src/tools/clippy/clippy_lints/src/misc_early.rs @@ -271,7 +271,7 @@ impl EarlyLintPass for MiscEarlyLints { cx, BUILTIN_TYPE_SHADOW, param.ident.span, - &format!("This generic shadows the built-in type `{}`", name), + &format!("this generic shadows the built-in type `{}`", name), ); } } @@ -298,9 +298,9 @@ impl EarlyLintPass for MiscEarlyLints { cx, UNNEEDED_FIELD_PATTERN, pat.span, - "All the struct fields are matched to a wildcard pattern, consider using `..`.", + "all the struct fields are matched to a wildcard pattern, consider using `..`", None, - &format!("Try with `{} {{ .. }}` instead", type_name), + &format!("try with `{} {{ .. }}` instead", type_name), ); return; } @@ -313,7 +313,7 @@ impl EarlyLintPass for MiscEarlyLints { cx, UNNEEDED_FIELD_PATTERN, field.span, - "You matched a field with a wildcard pattern. Consider using `..` instead", + "you matched a field with a wildcard pattern, consider using `..` instead", ); } else { let mut normal = vec![]; @@ -333,10 +333,10 @@ impl EarlyLintPass for MiscEarlyLints { cx, UNNEEDED_FIELD_PATTERN, field.span, - "You matched a field with a wildcard pattern. Consider using `..` \ + "you matched a field with a wildcard pattern, consider using `..` \ instead", None, - &format!("Try with `{} {{ {}, .. }}`", type_name, normal[..].join(", ")), + &format!("try with `{} {{ {}, .. }}`", type_name, normal[..].join(", ")), ); } } diff --git a/src/tools/clippy/clippy_lints/src/needless_arbitrary_self_type.rs b/src/tools/clippy/clippy_lints/src/needless_arbitrary_self_type.rs new file mode 100644 index 00000000000..38bdd0f7ed2 --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/needless_arbitrary_self_type.rs @@ -0,0 +1,118 @@ +use crate::utils::span_lint_and_sugg; +use if_chain::if_chain; +use rustc_ast::ast::{BindingMode, Lifetime, Mutability, Param, PatKind, Path, TyKind}; +use rustc_errors::Applicability; +use rustc_lint::{EarlyContext, EarlyLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; +use rustc_span::symbol::kw; +use rustc_span::Span; + +declare_clippy_lint! { + /// **What it does:** The lint checks for `self` in fn parameters that + /// specify the `Self`-type explicitly + /// **Why is this bad?** Increases the amount and decreases the readability of code + /// + /// **Known problems:** None + /// + /// **Example:** + /// ```rust + /// enum ValType { + /// I32, + /// I64, + /// F32, + /// F64, + /// } + /// + /// impl ValType { + /// pub fn bytes(self: Self) -> usize { + /// match self { + /// Self::I32 | Self::F32 => 4, + /// Self::I64 | Self::F64 => 8, + /// } + /// } + /// } + /// ``` + /// + /// Could be rewritten as + /// + /// ```rust + /// enum ValType { + /// I32, + /// I64, + /// F32, + /// F64, + /// } + /// + /// impl ValType { + /// pub fn bytes(self) -> usize { + /// match self { + /// Self::I32 | Self::F32 => 4, + /// Self::I64 | Self::F64 => 8, + /// } + /// } + /// } + /// ``` + pub NEEDLESS_ARBITRARY_SELF_TYPE, + complexity, + "type of `self` parameter is already by default `Self`" +} + +declare_lint_pass!(NeedlessArbitrarySelfType => [NEEDLESS_ARBITRARY_SELF_TYPE]); + +enum Mode { + Ref(Option), + Value, +} + +fn check_param_inner(cx: &EarlyContext<'_>, path: &Path, span: Span, binding_mode: &Mode, mutbl: Mutability) { + if_chain! { + if let [segment] = &path.segments[..]; + if segment.ident.name == kw::SelfUpper; + then { + let self_param = match (binding_mode, mutbl) { + (Mode::Ref(None), Mutability::Mut) => "&mut self".to_string(), + (Mode::Ref(Some(lifetime)), Mutability::Mut) => format!("&{} mut self", &lifetime.ident.name), + (Mode::Ref(None), Mutability::Not) => "&self".to_string(), + (Mode::Ref(Some(lifetime)), Mutability::Not) => format!("&{} self", &lifetime.ident.name), + (Mode::Value, Mutability::Mut) => "mut self".to_string(), + (Mode::Value, Mutability::Not) => "self".to_string(), + }; + + span_lint_and_sugg( + cx, + NEEDLESS_ARBITRARY_SELF_TYPE, + span, + "the type of the `self` parameter does not need to be arbitrary", + "consider to change this parameter to", + self_param, + Applicability::MachineApplicable, + ) + } + } +} + +impl EarlyLintPass for NeedlessArbitrarySelfType { + fn check_param(&mut self, cx: &EarlyContext<'_>, p: &Param) { + if !p.is_self() { + return; + } + + match &p.ty.kind { + TyKind::Path(None, path) => { + if let PatKind::Ident(BindingMode::ByValue(mutbl), _, _) = p.pat.kind { + check_param_inner(cx, path, p.span.to(p.ty.span), &Mode::Value, mutbl) + } + }, + TyKind::Rptr(lifetime, mut_ty) => { + if_chain! { + if let TyKind::Path(None, path) = &mut_ty.ty.kind; + if let PatKind::Ident(BindingMode::ByValue(Mutability::Not), _, _) = p.pat.kind; + then { + check_param_inner(cx, path, p.span.to(p.ty.span), &Mode::Ref(*lifetime), mut_ty.mutbl) + } + } + }, + _ => {}, + } + } +} diff --git a/src/tools/clippy/clippy_lints/src/needless_bool.rs b/src/tools/clippy/clippy_lints/src/needless_bool.rs index 8e44f2ec240..dc5aa669139 100644 --- a/src/tools/clippy/clippy_lints/src/needless_bool.rs +++ b/src/tools/clippy/clippy_lints/src/needless_bool.rs @@ -243,7 +243,7 @@ fn check_comparison<'a, 'tcx>( cx, BOOL_COMPARISON, e.span, - "This comparison might be written more concisely", + "this comparison might be written more concisely", "try simplifying it as shown", format!( "{} != {}", diff --git a/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs b/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs index a7f7c97fc48..047a78b0878 100644 --- a/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs +++ b/src/tools/clippy/clippy_lints/src/needless_pass_by_value.rs @@ -40,9 +40,8 @@ declare_clippy_lint! { /// assert_eq!(v.len(), 42); /// } /// ``` - /// + /// should be /// ```rust - /// // should be /// fn foo(v: &[i32]) { /// assert_eq!(v.len(), 42); /// } @@ -159,26 +158,19 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue { } } + // // * Exclude a type that is specifically bounded by `Borrow`. // * Exclude a type whose reference also fulfills its bound. (e.g., `std::convert::AsRef`, // `serde::Serialize`) let (implements_borrow_trait, all_borrowable_trait) = { - let preds = preds - .iter() - .filter(|t| t.self_ty() == ty) - .collect::>(); + let preds = preds.iter().filter(|t| t.self_ty() == ty).collect::>(); ( preds.iter().any(|t| t.def_id() == borrow_trait), !preds.is_empty() && { let ty_empty_region = cx.tcx.mk_imm_ref(cx.tcx.lifetimes.re_root_empty, ty); preds.iter().all(|t| { - let ty_params = t - .trait_ref - .substs - .iter() - .skip(1) - .collect::>(); + let ty_params = t.trait_ref.substs.iter().skip(1).collect::>(); implements_trait(cx, ty_empty_region, t.def_id(), &ty_params) }) }, diff --git a/src/tools/clippy/clippy_lints/src/neg_cmp_op_on_partial_ord.rs b/src/tools/clippy/clippy_lints/src/neg_cmp_op_on_partial_ord.rs index 95613a1b82e..4fb899125e8 100644 --- a/src/tools/clippy/clippy_lints/src/neg_cmp_op_on_partial_ord.rs +++ b/src/tools/clippy/clippy_lints/src/neg_cmp_op_on_partial_ord.rs @@ -79,10 +79,10 @@ impl<'tcx> LateLintPass<'tcx> for NoNegCompOpForPartialOrd { cx, NEG_CMP_OP_ON_PARTIAL_ORD, expr.span, - "The use of negated comparison operators on partially ordered \ - types produces code that is hard to read and refactor. Please \ + "the use of negated comparison operators on partially ordered \ + types produces code that is hard to read and refactor, please \ consider using the `partial_cmp` method instead, to make it \ - clear that the two values could be incomparable." + clear that the two values could be incomparable" ) } } diff --git a/src/tools/clippy/clippy_lints/src/neg_multiply.rs b/src/tools/clippy/clippy_lints/src/neg_multiply.rs index 6b6c950e0ab..aa550510867 100644 --- a/src/tools/clippy/clippy_lints/src/neg_multiply.rs +++ b/src/tools/clippy/clippy_lints/src/neg_multiply.rs @@ -47,7 +47,7 @@ fn check_mul(cx: &LateContext<'_>, span: Span, lit: &Expr<'_>, exp: &Expr<'_>) { if let Constant::Int(1) = consts::lit_to_constant(&l.node, cx.typeck_results().expr_ty_opt(lit)); if cx.typeck_results().expr_ty(exp).is_integral(); then { - span_lint(cx, NEG_MULTIPLY, span, "Negation by multiplying with `-1`"); + span_lint(cx, NEG_MULTIPLY, span, "negation by multiplying with `-1`"); } } } diff --git a/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs b/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs index 4d4a9676654..3c041bac234 100644 --- a/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs +++ b/src/tools/clippy/clippy_lints/src/overflow_check_conditional.rs @@ -42,13 +42,13 @@ impl<'tcx> LateLintPass<'tcx> for OverflowCheckConditional { if let BinOpKind::Lt = op.node { if let BinOpKind::Add = op2.node { span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, - "You are trying to use classic C overflow conditions that will fail in Rust."); + "you are trying to use classic C overflow conditions that will fail in Rust"); } } if let BinOpKind::Gt = op.node { if let BinOpKind::Sub = op2.node { span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, - "You are trying to use classic C underflow conditions that will fail in Rust."); + "you are trying to use classic C underflow conditions that will fail in Rust"); } } } @@ -67,13 +67,13 @@ impl<'tcx> LateLintPass<'tcx> for OverflowCheckConditional { if let BinOpKind::Gt = op.node { if let BinOpKind::Add = op2.node { span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, - "You are trying to use classic C overflow conditions that will fail in Rust."); + "you are trying to use classic C overflow conditions that will fail in Rust"); } } if let BinOpKind::Lt = op.node { if let BinOpKind::Sub = op2.node { span_lint(cx, OVERFLOW_CHECK_CONDITIONAL, expr.span, - "You are trying to use classic C underflow conditions that will fail in Rust."); + "you are trying to use classic C underflow conditions that will fail in Rust"); } } } diff --git a/src/tools/clippy/clippy_lints/src/path_buf_push_overwrite.rs b/src/tools/clippy/clippy_lints/src/path_buf_push_overwrite.rs index 66a145a7f14..b8583402928 100644 --- a/src/tools/clippy/clippy_lints/src/path_buf_push_overwrite.rs +++ b/src/tools/clippy/clippy_lints/src/path_buf_push_overwrite.rs @@ -60,7 +60,7 @@ impl<'tcx> LateLintPass<'tcx> for PathBufPushOverwrite { cx, PATH_BUF_PUSH_OVERWRITE, lit.span, - "Calling `push` with '/' or '\\' (file system root) will overwrite the previous path definition", + "calling `push` with '/' or '\\' (file system root) will overwrite the previous path definition", "try", format!("\"{}\"", pushed_path_lit.trim_start_matches(|c| c == '/' || c == '\\')), Applicability::MachineApplicable, diff --git a/src/tools/clippy/clippy_lints/src/ptr.rs b/src/tools/clippy/clippy_lints/src/ptr.rs index 7b6bd69ffca..460d631fab0 100644 --- a/src/tools/clippy/clippy_lints/src/ptr.rs +++ b/src/tools/clippy/clippy_lints/src/ptr.rs @@ -145,7 +145,7 @@ impl<'tcx> LateLintPass<'tcx> for Ptr { cx, CMP_NULL, expr.span, - "Comparing with null is better expressed by the `.is_null()` method", + "comparing with null is better expressed by the `.is_null()` method", ); } } diff --git a/src/tools/clippy/clippy_lints/src/ranges.rs b/src/tools/clippy/clippy_lints/src/ranges.rs index 4c1f2e8e01a..f88075798ca 100644 --- a/src/tools/clippy/clippy_lints/src/ranges.rs +++ b/src/tools/clippy/clippy_lints/src/ranges.rs @@ -160,7 +160,7 @@ impl<'tcx> LateLintPass<'tcx> for Ranges { span_lint(cx, RANGE_ZIP_WITH_LEN, expr.span, - &format!("It is more idiomatic to use `{}.iter().enumerate()`", + &format!("it is more idiomatic to use `{}.iter().enumerate()`", snippet(cx, iter_args[0].span, "_"))); } } diff --git a/src/tools/clippy/clippy_lints/src/redundant_static_lifetimes.rs b/src/tools/clippy/clippy_lints/src/redundant_static_lifetimes.rs index c6f57298c26..7bbcc67aa2d 100644 --- a/src/tools/clippy/clippy_lints/src/redundant_static_lifetimes.rs +++ b/src/tools/clippy/clippy_lints/src/redundant_static_lifetimes.rs @@ -86,13 +86,13 @@ impl EarlyLintPass for RedundantStaticLifetimes { fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) { if !item.span.from_expansion() { if let ItemKind::Const(_, ref var_type, _) = item.kind { - self.visit_type(var_type, cx, "Constants have by default a `'static` lifetime"); + self.visit_type(var_type, cx, "constants have by default a `'static` lifetime"); // Don't check associated consts because `'static` cannot be elided on those (issue // #2438) } if let ItemKind::Static(ref var_type, _, _) = item.kind { - self.visit_type(var_type, cx, "Statics have by default a `'static` lifetime"); + self.visit_type(var_type, cx, "statics have by default a `'static` lifetime"); } } } diff --git a/src/tools/clippy/clippy_lints/src/reference.rs b/src/tools/clippy/clippy_lints/src/reference.rs index fe457aad50e..3fda00403c6 100644 --- a/src/tools/clippy/clippy_lints/src/reference.rs +++ b/src/tools/clippy/clippy_lints/src/reference.rs @@ -92,7 +92,7 @@ impl EarlyLintPass for RefInDeref { cx, REF_IN_DEREF, object.span, - "Creating a reference that is immediately dereferenced.", + "creating a reference that is immediately dereferenced", "try this", snippet_with_applicability(cx, inner.span, "_", &mut applicability).to_string(), applicability, diff --git a/src/tools/clippy/clippy_lints/src/shadow.rs b/src/tools/clippy/clippy_lints/src/shadow.rs index 6f03e92bde3..2610157763a 100644 --- a/src/tools/clippy/clippy_lints/src/shadow.rs +++ b/src/tools/clippy/clippy_lints/src/shadow.rs @@ -1,4 +1,3 @@ -use crate::reexport::Name; use crate::utils::{contains_name, higher, iter_input_pats, snippet, span_lint_and_then}; use rustc_hir::intravisit::FnKind; use rustc_hir::{ @@ -10,6 +9,7 @@ use rustc_middle::lint::in_external_macro; use rustc_middle::ty; use rustc_session::{declare_lint_pass, declare_tool_lint}; use rustc_span::source_map::Span; +use rustc_span::symbol::Symbol; declare_clippy_lint! { /// **What it does:** Checks for bindings that shadow other bindings already in @@ -123,7 +123,7 @@ fn check_fn<'tcx>(cx: &LateContext<'tcx>, decl: &'tcx FnDecl<'_>, body: &'tcx Bo check_expr(cx, &body.value, &mut bindings); } -fn check_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'_>, bindings: &mut Vec<(Name, Span)>) { +fn check_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'_>, bindings: &mut Vec<(Symbol, Span)>) { let len = bindings.len(); for stmt in block.stmts { match stmt.kind { @@ -138,7 +138,7 @@ fn check_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'_>, bindings: & bindings.truncate(len); } -fn check_local<'tcx>(cx: &LateContext<'tcx>, local: &'tcx Local<'_>, bindings: &mut Vec<(Name, Span)>) { +fn check_local<'tcx>(cx: &LateContext<'tcx>, local: &'tcx Local<'_>, bindings: &mut Vec<(Symbol, Span)>) { if in_external_macro(cx.sess(), local.span) { return; } @@ -173,7 +173,7 @@ fn check_pat<'tcx>( pat: &'tcx Pat<'_>, init: Option<&'tcx Expr<'_>>, span: Span, - bindings: &mut Vec<(Name, Span)>, + bindings: &mut Vec<(Symbol, Span)>, ) { // TODO: match more stuff / destructuring match pat.kind { @@ -254,7 +254,7 @@ fn check_pat<'tcx>( fn lint_shadow<'tcx>( cx: &LateContext<'tcx>, - name: Name, + name: Symbol, span: Span, pattern_span: Span, init: Option<&'tcx Expr<'_>>, @@ -315,7 +315,7 @@ fn lint_shadow<'tcx>( } } -fn check_expr<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, bindings: &mut Vec<(Name, Span)>) { +fn check_expr<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, bindings: &mut Vec<(Symbol, Span)>) { if in_external_macro(cx.sess(), expr.span) { return; } @@ -351,7 +351,7 @@ fn check_expr<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, bindings: &mut } } -fn check_ty<'tcx>(cx: &LateContext<'tcx>, ty: &'tcx Ty<'_>, bindings: &mut Vec<(Name, Span)>) { +fn check_ty<'tcx>(cx: &LateContext<'tcx>, ty: &'tcx Ty<'_>, bindings: &mut Vec<(Symbol, Span)>) { match ty.kind { TyKind::Slice(ref sty) => check_ty(cx, sty, bindings), TyKind::Array(ref fty, ref anon_const) => { @@ -371,7 +371,7 @@ fn check_ty<'tcx>(cx: &LateContext<'tcx>, ty: &'tcx Ty<'_>, bindings: &mut Vec<( } } -fn is_self_shadow(name: Name, expr: &Expr<'_>) -> bool { +fn is_self_shadow(name: Symbol, expr: &Expr<'_>) -> bool { match expr.kind { ExprKind::Box(ref inner) | ExprKind::AddrOf(_, _, ref inner) => is_self_shadow(name, inner), ExprKind::Block(ref block, _) => { @@ -383,6 +383,6 @@ fn is_self_shadow(name: Name, expr: &Expr<'_>) -> bool { } } -fn path_eq_name(name: Name, path: &Path<'_>) -> bool { +fn path_eq_name(name: Symbol, path: &Path<'_>) -> bool { !path.is_global() && path.segments.len() == 1 && path.segments[0].ident.as_str() == name.as_str() } diff --git a/src/tools/clippy/clippy_lints/src/stable_sort_primitive.rs b/src/tools/clippy/clippy_lints/src/stable_sort_primitive.rs new file mode 100644 index 00000000000..cd7056620a2 --- /dev/null +++ b/src/tools/clippy/clippy_lints/src/stable_sort_primitive.rs @@ -0,0 +1,130 @@ +use crate::utils::{is_slice_of_primitives, span_lint_and_sugg, sugg::Sugg}; + +use if_chain::if_chain; + +use rustc_errors::Applicability; +use rustc_hir::{Expr, ExprKind}; +use rustc_lint::{LateContext, LateLintPass}; +use rustc_session::{declare_lint_pass, declare_tool_lint}; + +declare_clippy_lint! { + /// **What it does:** + /// When sorting primitive values (integers, bools, chars, as well + /// as arrays, slices, and tuples of such items), it is better to + /// use an unstable sort than a stable sort. + /// + /// **Why is this bad?** + /// Using a stable sort consumes more memory and cpu cycles. Because + /// values which compare equal are identical, preserving their + /// relative order (the guarantee that a stable sort provides) means + /// nothing, while the extra costs still apply. + /// + /// **Known problems:** + /// None + /// + /// **Example:** + /// + /// ```rust + /// let mut vec = vec![2, 1, 3]; + /// vec.sort(); + /// ``` + /// Use instead: + /// ```rust + /// let mut vec = vec![2, 1, 3]; + /// vec.sort_unstable(); + /// ``` + pub STABLE_SORT_PRIMITIVE, + perf, + "use of sort() when sort_unstable() is equivalent" +} + +declare_lint_pass!(StableSortPrimitive => [STABLE_SORT_PRIMITIVE]); + +/// The three "kinds" of sorts +enum SortingKind { + Vanilla, + /* The other kinds of lint are currently commented out because they + * can map distinct values to equal ones. If the key function is + * provably one-to-one, or if the Cmp function conserves equality, + * then they could be linted on, but I don't know if we can check + * for that. */ + + /* ByKey, + * ByCmp, */ +} +impl SortingKind { + /// The name of the stable version of this kind of sort + fn stable_name(&self) -> &str { + match self { + SortingKind::Vanilla => "sort", + /* SortingKind::ByKey => "sort_by_key", + * SortingKind::ByCmp => "sort_by", */ + } + } + /// The name of the unstable version of this kind of sort + fn unstable_name(&self) -> &str { + match self { + SortingKind::Vanilla => "sort_unstable", + /* SortingKind::ByKey => "sort_unstable_by_key", + * SortingKind::ByCmp => "sort_unstable_by", */ + } + } + /// Takes the name of a function call and returns the kind of sort + /// that corresponds to that function name (or None if it isn't) + fn from_stable_name(name: &str) -> Option { + match name { + "sort" => Some(SortingKind::Vanilla), + // "sort_by" => Some(SortingKind::ByCmp), + // "sort_by_key" => Some(SortingKind::ByKey), + _ => None, + } + } +} + +/// A detected instance of this lint +struct LintDetection { + slice_name: String, + method: SortingKind, + method_args: String, +} + +fn detect_stable_sort_primitive(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option { + if_chain! { + if let ExprKind::MethodCall(method_name, _, args, _) = &expr.kind; + if let Some(slice) = &args.get(0); + if let Some(method) = SortingKind::from_stable_name(&method_name.ident.name.as_str()); + if is_slice_of_primitives(cx, slice); + then { + let args_str = args.iter().skip(1).map(|arg| Sugg::hir(cx, arg, "..").to_string()).collect::>().join(", "); + Some(LintDetection { slice_name: Sugg::hir(cx, slice, "..").to_string(), method, method_args: args_str }) + } else { + None + } + } +} + +impl LateLintPass<'_> for StableSortPrimitive { + fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) { + if let Some(detection) = detect_stable_sort_primitive(cx, expr) { + span_lint_and_sugg( + cx, + STABLE_SORT_PRIMITIVE, + expr.span, + format!( + "Use {} instead of {}", + detection.method.unstable_name(), + detection.method.stable_name() + ) + .as_str(), + "try", + format!( + "{}.{}({})", + detection.slice_name, + detection.method.unstable_name(), + detection.method_args + ), + Applicability::MachineApplicable, + ); + } + } +} diff --git a/src/tools/clippy/clippy_lints/src/suspicious_trait_impl.rs b/src/tools/clippy/clippy_lints/src/suspicious_trait_impl.rs index 6d1d083fa8d..4e335a0222f 100644 --- a/src/tools/clippy/clippy_lints/src/suspicious_trait_impl.rs +++ b/src/tools/clippy/clippy_lints/src/suspicious_trait_impl.rs @@ -64,26 +64,22 @@ impl<'tcx> LateLintPass<'tcx> for SuspiciousImpl { | hir::BinOpKind::Gt => return, _ => {}, } - // Check if the binary expression is part of another bi/unary expression - // or operator assignment as a child node - let mut parent_expr = cx.tcx.hir().get_parent_node(expr.hir_id); - while parent_expr != hir::CRATE_HIR_ID { - if let hir::Node::Expr(e) = cx.tcx.hir().get(parent_expr) { - match e.kind { - hir::ExprKind::Binary(..) - | hir::ExprKind::Unary(hir::UnOp::UnNot | hir::UnOp::UnNeg, _) - | hir::ExprKind::AssignOp(..) => return, - _ => {}, + + // Check for more than one binary operation in the implemented function + // Linting when multiple operations are involved can result in false positives + if_chain! { + let parent_fn = cx.tcx.hir().get_parent_item(expr.hir_id); + if let hir::Node::ImplItem(impl_item) = cx.tcx.hir().get(parent_fn); + if let hir::ImplItemKind::Fn(_, body_id) = impl_item.kind; + let body = cx.tcx.hir().body(body_id); + let mut visitor = BinaryExprVisitor { nb_binops: 0 }; + + then { + walk_expr(&mut visitor, &body.value); + if visitor.nb_binops > 1 { + return; } } - parent_expr = cx.tcx.hir().get_parent_node(parent_expr); - } - // as a parent node - let mut visitor = BinaryExprVisitor { in_binary_expr: false }; - walk_expr(&mut visitor, expr); - - if visitor.in_binary_expr { - return; } if let Some(impl_trait) = check_binop( @@ -102,7 +98,7 @@ impl<'tcx> LateLintPass<'tcx> for SuspiciousImpl { cx, SUSPICIOUS_ARITHMETIC_IMPL, binop.span, - &format!(r#"Suspicious use of binary operator in `{}` impl"#, impl_trait), + &format!("suspicious use of binary operator in `{}` impl", impl_trait), ); } @@ -139,7 +135,7 @@ impl<'tcx> LateLintPass<'tcx> for SuspiciousImpl { cx, SUSPICIOUS_OP_ASSIGN_IMPL, binop.span, - &format!(r#"Suspicious use of binary operator in `{}` impl"#, impl_trait), + &format!("suspicious use of binary operator in `{}` impl", impl_trait), ); } } @@ -181,7 +177,7 @@ fn check_binop( } struct BinaryExprVisitor { - in_binary_expr: bool, + nb_binops: u32, } impl<'tcx> Visitor<'tcx> for BinaryExprVisitor { @@ -191,12 +187,13 @@ impl<'tcx> Visitor<'tcx> for BinaryExprVisitor { match expr.kind { hir::ExprKind::Binary(..) | hir::ExprKind::Unary(hir::UnOp::UnNot | hir::UnOp::UnNeg, _) - | hir::ExprKind::AssignOp(..) => self.in_binary_expr = true, + | hir::ExprKind::AssignOp(..) => self.nb_binops += 1, _ => {}, } walk_expr(self, expr); } + fn nested_visit_map(&mut self) -> NestedVisitorMap { NestedVisitorMap::None } diff --git a/src/tools/clippy/clippy_lints/src/trait_bounds.rs b/src/tools/clippy/clippy_lints/src/trait_bounds.rs index 0ef70311fb1..d4acf8df46d 100644 --- a/src/tools/clippy/clippy_lints/src/trait_bounds.rs +++ b/src/tools/clippy/clippy_lints/src/trait_bounds.rs @@ -2,9 +2,10 @@ use crate::utils::{in_macro, snippet, snippet_with_applicability, span_lint_and_ use if_chain::if_chain; use rustc_data_structures::fx::FxHashMap; use rustc_errors::Applicability; -use rustc_hir::{GenericBound, Generics, WherePredicate}; +use rustc_hir::{def::Res, GenericBound, Generics, ParamName, Path, QPath, 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 @@ -29,6 +30,35 @@ declare_clippy_lint! { "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. + /// + /// **Known problems:** None. + /// + /// **Example:** + /// ```rust + /// fn func(arg: T) where T: Clone + Default {} + /// ``` + /// + /// Could be written as: + /// + /// ```rust + /// fn func(arg: T) {} + /// ``` + /// or + /// + /// ```rust + /// fn func(arg: T) where T: Clone + Default {} + /// ``` + 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, @@ -41,10 +71,25 @@ impl TraitBounds { } } -impl_lint_pass!(TraitBounds => [TYPE_REPETITION_IN_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 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 + } +} + +impl TraitBounds { + fn check_type_repetition(self, cx: &LateContext<'_>, gen: &'_ Generics<'_>) { if in_macro(gen.span) { return; } @@ -101,3 +146,48 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds { } } } + +fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) { + if in_macro(gen.span) || 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() + .filter_map(get_trait_res_span_from_bound) + .collect::>(); + map.insert(*ident, res); + } + } + + for predicate in gen.where_clause.predicates { + if_chain! { + if let WherePredicate::BoundPredicate(ref bound_predicate) = predicate; + if !in_macro(bound_predicate.span); + if let TyKind::Path(ref path) = bound_predicate.bounded_ty.kind; + if let QPath::Resolved(_, Path { ref segments, .. }) = path; + if let Some(segment) = segments.first(); + if let Some(trait_resolutions_direct) = map.get(&segment.ident); + then { + for (res_where, _) in bound_predicate.bounds.iter().filter_map(get_trait_res_span_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", + ); + } + } + } + } + } +} diff --git a/src/tools/clippy/clippy_lints/src/transmute.rs b/src/tools/clippy/clippy_lints/src/transmute.rs index f077c146183..7b5e92eb5ee 100644 --- a/src/tools/clippy/clippy_lints/src/transmute.rs +++ b/src/tools/clippy/clippy_lints/src/transmute.rs @@ -61,12 +61,14 @@ declare_clippy_lint! { /// /// **Example:** /// - /// ```rust,ignore - /// core::intrinsics::transmute::<*const [i32], *const [u16]>(p) + /// ```rust + /// # let p: *const [i32] = &[]; + /// unsafe { std::mem::transmute::<*const [i32], *const [u16]>(p) }; /// ``` /// Use instead: /// ```rust - /// p as *const [u16] + /// # let p: *const [i32] = &[]; + /// p as *const [u16]; /// ``` pub TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS, complexity, @@ -704,14 +706,14 @@ fn can_be_expressed_as_pointer_cast<'tcx>( from_ty: Ty<'tcx>, to_ty: Ty<'tcx>, ) -> bool { - use CastKind::*; + use CastKind::{AddrPtrCast, ArrayPtrCast, FnPtrAddrCast, FnPtrPtrCast, PtrAddrCast, PtrPtrCast}; matches!( check_cast(cx, e, from_ty, to_ty), Some(PtrPtrCast | PtrAddrCast | AddrPtrCast | ArrayPtrCast | FnPtrPtrCast | FnPtrAddrCast) ) } -/// If a cast from from_ty to to_ty is valid, returns an Ok containing the kind of +/// If a cast from `from_ty` to `to_ty` is valid, returns an Ok containing the kind of /// the cast. In certain cases, including some invalid casts from array references /// to pointers, this may cause additional errors to be emitted and/or ICE error /// messages. This function will panic if that occurs. diff --git a/src/tools/clippy/clippy_lints/src/try_err.rs b/src/tools/clippy/clippy_lints/src/try_err.rs index d3b351f30ef..3bd73d9f21a 100644 --- a/src/tools/clippy/clippy_lints/src/try_err.rs +++ b/src/tools/clippy/clippy_lints/src/try_err.rs @@ -1,10 +1,13 @@ -use crate::utils::{match_qpath, paths, snippet, snippet_with_macro_callsite, span_lint_and_sugg}; +use crate::utils::{ + is_type_diagnostic_item, match_def_path, match_qpath, paths, snippet, snippet_with_macro_callsite, + span_lint_and_sugg, +}; use if_chain::if_chain; use rustc_errors::Applicability; -use rustc_hir::{Arm, Expr, ExprKind, MatchSource}; +use rustc_hir::{Expr, ExprKind, MatchSource}; use rustc_lint::{LateContext, LateLintPass}; use rustc_middle::lint::in_external_macro; -use rustc_middle::ty::Ty; +use rustc_middle::ty::{self, Ty}; use rustc_session::{declare_lint_pass, declare_tool_lint}; declare_clippy_lint! { @@ -65,19 +68,39 @@ impl<'tcx> LateLintPass<'tcx> for TryErr { if let Some(ref err_arg) = err_args.get(0); if let ExprKind::Path(ref err_fun_path) = err_fun.kind; if match_qpath(err_fun_path, &paths::RESULT_ERR); - if let Some(return_type) = find_err_return_type(cx, &expr.kind); - + if let Some(return_ty) = find_return_type(cx, &expr.kind); then { - let err_type = cx.typeck_results().expr_ty(err_arg); + let prefix; + let suffix; + let err_ty; + + if let Some(ty) = result_error_type(cx, return_ty) { + prefix = "Err("; + suffix = ")"; + err_ty = ty; + } else if let Some(ty) = poll_result_error_type(cx, return_ty) { + prefix = "Poll::Ready(Err("; + suffix = "))"; + err_ty = ty; + } else if let Some(ty) = poll_option_result_error_type(cx, return_ty) { + prefix = "Poll::Ready(Some(Err("; + suffix = ")))"; + err_ty = ty; + } else { + return; + }; + + let expr_err_ty = cx.typeck_results().expr_ty(err_arg); + let origin_snippet = if err_arg.span.from_expansion() { snippet_with_macro_callsite(cx, err_arg.span, "_") } else { snippet(cx, err_arg.span, "_") }; - let suggestion = if err_type == return_type { - format!("return Err({})", origin_snippet) + let suggestion = if err_ty == expr_err_ty { + format!("return {}{}{}", prefix, origin_snippet, suffix) } else { - format!("return Err({}.into())", origin_snippet) + format!("return {}{}.into(){}", prefix, origin_snippet, suffix) }; span_lint_and_sugg( @@ -94,27 +117,68 @@ impl<'tcx> LateLintPass<'tcx> for TryErr { } } -// In order to determine whether to suggest `.into()` or not, we need to find the error type the -// function returns. To do that, we look for the From::from call (see tree above), and capture -// its output type. -fn find_err_return_type<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx ExprKind<'_>) -> Option> { +/// Finds function return type by examining return expressions in match arms. +fn find_return_type<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx ExprKind<'_>) -> Option> { if let ExprKind::Match(_, ref arms, MatchSource::TryDesugar) = expr { - arms.iter().find_map(|ty| find_err_return_type_arm(cx, ty)) - } else { - None + for arm in arms.iter() { + if let ExprKind::Ret(Some(ref ret)) = arm.body.kind { + return Some(cx.typeck_results().expr_ty(ret)); + } + } } + None } -// Check for From::from in one of the match arms. -fn find_err_return_type_arm<'tcx>(cx: &LateContext<'tcx>, arm: &'tcx Arm<'_>) -> Option> { +/// Extracts the error type from Result. +fn result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option> { if_chain! { - if let ExprKind::Ret(Some(ref err_ret)) = arm.body.kind; - if let ExprKind::Call(ref from_error_path, ref from_error_args) = err_ret.kind; - if let ExprKind::Path(ref from_error_fn) = from_error_path.kind; - if match_qpath(from_error_fn, &paths::TRY_FROM_ERROR); - if let Some(from_error_arg) = from_error_args.get(0); + if let ty::Adt(_, subst) = ty.kind; + if is_type_diagnostic_item(cx, ty, sym!(result_type)); + let err_ty = subst.type_at(1); then { - Some(cx.typeck_results().expr_ty(from_error_arg)) + Some(err_ty) + } else { + None + } + } +} + +/// Extracts the error type from Poll>. +fn poll_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option> { + if_chain! { + if let ty::Adt(def, subst) = ty.kind; + if match_def_path(cx, def.did, &paths::POLL); + let ready_ty = subst.type_at(0); + + if let ty::Adt(ready_def, ready_subst) = ready_ty.kind; + if cx.tcx.is_diagnostic_item(sym!(result_type), ready_def.did); + let err_ty = ready_subst.type_at(1); + + then { + Some(err_ty) + } else { + None + } + } +} + +/// Extracts the error type from Poll>>. +fn poll_option_result_error_type<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> Option> { + if_chain! { + if let ty::Adt(def, subst) = ty.kind; + if match_def_path(cx, def.did, &paths::POLL); + let ready_ty = subst.type_at(0); + + if let ty::Adt(ready_def, ready_subst) = ready_ty.kind; + if cx.tcx.is_diagnostic_item(sym!(option_type), ready_def.did); + let some_ty = ready_subst.type_at(0); + + if let ty::Adt(some_def, some_subst) = some_ty.kind; + if cx.tcx.is_diagnostic_item(sym!(result_type), some_def.did); + let err_ty = some_subst.type_at(1); + + then { + Some(err_ty) } else { None } diff --git a/src/tools/clippy/clippy_lints/src/unwrap.rs b/src/tools/clippy/clippy_lints/src/unwrap.rs index f2bbde28c2a..ea4b8172c9c 100644 --- a/src/tools/clippy/clippy_lints/src/unwrap.rs +++ b/src/tools/clippy/clippy_lints/src/unwrap.rs @@ -181,8 +181,8 @@ impl<'a, 'tcx> Visitor<'tcx> for UnwrappableVariablesVisitor<'a, 'tcx> { self.cx, UNNECESSARY_UNWRAP, expr.span, - &format!("You checked before that `{}()` cannot fail. \ - Instead of checking and unwrapping, it's better to use `if let` or `match`.", + &format!("you checked before that `{}()` cannot fail, \ + instead of checking and unwrapping, it's better to use `if let` or `match`", method_name.ident.name), |diag| { diag.span_label(unwrappable.check.span, "the check is happening here"); }, ); @@ -191,7 +191,7 @@ impl<'a, 'tcx> Visitor<'tcx> for UnwrappableVariablesVisitor<'a, 'tcx> { self.cx, PANICKING_UNWRAP, expr.span, - &format!("This call to `{}()` will always panic.", + &format!("this call to `{}()` will always panic", method_name.ident.name), |diag| { diag.span_label(unwrappable.check.span, "because of this check"); }, ); diff --git a/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs b/src/tools/clippy/clippy_lints/src/utils/ast_utils.rs old mode 100755 new mode 100644 diff --git a/src/tools/clippy/clippy_lints/src/utils/attrs.rs b/src/tools/clippy/clippy_lints/src/utils/attrs.rs index 407527251da..a3975683cb3 100644 --- a/src/tools/clippy/clippy_lints/src/utils/attrs.rs +++ b/src/tools/clippy/clippy_lints/src/utils/attrs.rs @@ -75,12 +75,12 @@ pub fn get_attr<'a>( }) .map_or_else( || { - sess.span_err(attr_segments[1].ident.span, "Usage of unknown attribute"); + sess.span_err(attr_segments[1].ident.span, "usage of unknown attribute"); false }, |deprecation_status| { let mut diag = - sess.struct_span_err(attr_segments[1].ident.span, "Usage of deprecated attribute"); + sess.struct_span_err(attr_segments[1].ident.span, "usage of deprecated attribute"); match *deprecation_status { DeprecationStatus::Deprecated => { diag.emit(); diff --git a/src/tools/clippy/clippy_lints/src/utils/mod.rs b/src/tools/clippy/clippy_lints/src/utils/mod.rs index 95a12fe1935..223628cc610 100644 --- a/src/tools/clippy/clippy_lints/src/utils/mod.rs +++ b/src/tools/clippy/clippy_lints/src/utils/mod.rs @@ -43,6 +43,7 @@ use rustc_infer::infer::TyCtxtInferExt; use rustc_lint::{LateContext, Level, Lint, LintContext}; use rustc_middle::hir::map::Map; use rustc_middle::ty::{self, layout::IntegerExt, subst::GenericArg, Ty, TyCtxt, TypeFoldable}; +use rustc_mir::const_eval; use rustc_span::hygiene::{ExpnKind, MacroKind}; use rustc_span::source_map::original_sp; use rustc_span::symbol::{self, kw, Symbol}; @@ -52,7 +53,6 @@ use rustc_trait_selection::traits::query::normalize::AtExt; use smallvec::SmallVec; use crate::consts::{constant, Constant}; -use crate::reexport::Name; /// Returns `true` if the two spans come from differing expansions (i.e., one is /// from a macro and one isn't). @@ -150,7 +150,7 @@ pub fn match_trait_method(cx: &LateContext<'_>, expr: &Expr<'_>, path: &[&str]) } /// Checks if an expression references a variable of the given name. -pub fn match_var(expr: &Expr<'_>, var: Name) -> bool { +pub fn match_var(expr: &Expr<'_>, var: Symbol) -> bool { if let ExprKind::Path(QPath::Resolved(None, ref path)) = expr.kind { if let [p] = path.segments { return p.ident.name == var; @@ -420,7 +420,7 @@ pub fn is_entrypoint_fn(cx: &LateContext<'_>, def_id: DefId) -> bool { } /// Gets the name of the item the expression is in, if available. -pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option { +pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option { let parent_id = cx.tcx.hir().get_parent_item(expr.hir_id); match cx.tcx.hir().find(parent_id) { Some( @@ -433,7 +433,7 @@ pub fn get_item_name(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option { } /// Gets the name of a `Pat`, if any. -pub fn get_pat_name(pat: &Pat<'_>) -> Option { +pub fn get_pat_name(pat: &Pat<'_>) -> Option { match pat.kind { PatKind::Binding(.., ref spname, _) => Some(spname.name), PatKind::Path(ref qpath) => single_segment_path(qpath).map(|ps| ps.ident.name), @@ -443,14 +443,14 @@ pub fn get_pat_name(pat: &Pat<'_>) -> Option { } struct ContainsName { - name: Name, + name: Symbol, result: bool, } impl<'tcx> Visitor<'tcx> for ContainsName { type Map = Map<'tcx>; - fn visit_name(&mut self, _: Span, name: Name) { + fn visit_name(&mut self, _: Span, name: Symbol) { if self.name == name { self.result = true; } @@ -461,7 +461,7 @@ impl<'tcx> Visitor<'tcx> for ContainsName { } /// Checks if an `Expr` contains a certain name. -pub fn contains_name(name: Name, expr: &Expr<'_>) -> bool { +pub fn contains_name(name: Symbol, expr: &Expr<'_>) -> bool { let mut cn = ContainsName { name, result: false }; cn.visit_expr(expr); cn.result @@ -869,11 +869,19 @@ pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool { /// 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 { + fn has_no_arguments(cx: &LateContext<'_>, def_id: DefId) -> bool { + cx.tcx.fn_sig(def_id).skip_binder().inputs().is_empty() + } + if let ExprKind::Call(ref 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, + // FIXME: check the constness of the arguments, see https://github.com/rust-lang/rust-clippy/pull/5682#issuecomment-638681210 + def::Res::Def(DefKind::Fn, def_id) if has_no_arguments(cx, def_id) => { + const_eval::is_const_fn(cx.tcx, def_id) + }, def::Res::Def(_, def_id) => cx.tcx.is_promotable_const_fn(def_id), _ => false, }; @@ -1027,7 +1035,7 @@ pub fn is_allowed(cx: &LateContext<'_>, lint: &'static Lint, id: HirId) -> bool cx.tcx.lint_level_at_node(lint, id).0 == Level::Allow } -pub fn get_arg_name(pat: &Pat<'_>) -> Option { +pub fn get_arg_name(pat: &Pat<'_>) -> Option { match pat.kind { PatKind::Binding(.., ident, None) => Some(ident.name), PatKind::Ref(ref subpat, _) => get_arg_name(subpat), @@ -1378,6 +1386,36 @@ pub fn run_lints(cx: &LateContext<'_>, lints: &[&'static Lint], id: HirId) -> bo }) } +/// Returns true iff 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, + } +} + +/// Returns true iff the given expression is a slice of primitives (as defined in the +/// `is_recursively_primitive_type` function). +pub fn is_slice_of_primitives(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool { + let expr_type = cx.typeck_results().expr_ty_adjusted(expr); + match expr_type.kind { + ty::Slice(ref element_type) + | ty::Ref( + _, + ty::TyS { + kind: ty::Slice(ref element_type), + .. + }, + _, + ) => is_recursively_primitive_type(element_type), + _ => false, + } +} + #[macro_export] macro_rules! unwrap_cargo_metadata { ($cx: ident, $lint: ident, $deps: expr) => {{ diff --git a/src/tools/clippy/clippy_lints/src/utils/paths.rs b/src/tools/clippy/clippy_lints/src/utils/paths.rs index a515ee29c82..923b319d777 100644 --- a/src/tools/clippy/clippy_lints/src/utils/paths.rs +++ b/src/tools/clippy/clippy_lints/src/utils/paths.rs @@ -80,6 +80,7 @@ pub const PATH: [&str; 3] = ["std", "path", "Path"]; pub const PATH_BUF: [&str; 3] = ["std", "path", "PathBuf"]; pub const PATH_BUF_AS_PATH: [&str; 4] = ["std", "path", "PathBuf", "as_path"]; pub const PATH_TO_PATH_BUF: [&str; 4] = ["std", "path", "Path", "to_path_buf"]; +pub const POLL: [&str; 4] = ["core", "task", "poll", "Poll"]; pub const PTR_EQ: [&str; 3] = ["core", "ptr", "eq"]; pub const PTR_NULL: [&str; 2] = ["ptr", "null"]; pub const PTR_NULL_MUT: [&str; 2] = ["ptr", "null_mut"]; @@ -129,7 +130,6 @@ pub const TO_STRING: [&str; 3] = ["alloc", "string", "ToString"]; pub const TO_STRING_METHOD: [&str; 4] = ["alloc", "string", "ToString", "to_string"]; pub const TRANSMUTE: [&str; 4] = ["core", "intrinsics", "", "transmute"]; pub const TRY_FROM: [&str; 4] = ["core", "convert", "TryFrom", "try_from"]; -pub const TRY_FROM_ERROR: [&str; 4] = ["std", "ops", "Try", "from_error"]; pub const TRY_INTO_RESULT: [&str; 4] = ["std", "ops", "Try", "into_result"]; pub const TRY_INTO_TRAIT: [&str; 3] = ["core", "convert", "TryInto"]; pub const VEC: [&str; 3] = ["alloc", "vec", "Vec"]; diff --git a/src/tools/clippy/doc/adding_lints.md b/src/tools/clippy/doc/adding_lints.md index 8092be277cc..168092f7329 100644 --- a/src/tools/clippy/doc/adding_lints.md +++ b/src/tools/clippy/doc/adding_lints.md @@ -27,10 +27,7 @@ because that's clearly a non-descriptive name. ## Setup -When working on Clippy, you will need the current git master version of rustc, -which can change rapidly. Make sure you're working near rust-clippy's master, -and use the `setup-toolchain.sh` script to configure the appropriate toolchain -for the Clippy directory. +See the [Basics](basics.md#get-the-code) documentation. ## Getting Started @@ -38,12 +35,14 @@ There is a bit of boilerplate code that needs to be set up when creating a new lint. Fortunately, you can use the clippy dev tools to handle this for you. We are naming our new lint `foo_functions` (lints are generally written in snake case), and we don't need type information so it will have an early pass type -(more on this later on). To get started on this lint you can run -`cargo dev new_lint --name=foo_functions --pass=early --category=pedantic` -(category will default to nursery if not provided). This command will create -two files: `tests/ui/foo_functions.rs` and `clippy_lints/src/foo_functions.rs`, -as well as run `cargo dev update_lints` to register the new lint. For cargo lints, -two project hierarchies (fail/pass) will be created by default under `tests/ui-cargo`. +(more on this later on). If you're not sure if the name you chose fits the lint, +take a look at our [lint naming guidelines][lint_naming]. To get started on this +lint you can run `cargo dev new_lint --name=foo_functions --pass=early +--category=pedantic` (category will default to nursery if not provided). This +command will create two files: `tests/ui/foo_functions.rs` and +`clippy_lints/src/foo_functions.rs`, as well as run `cargo dev update_lints` to +register the new lint. For cargo lints, two project hierarchies (fail/pass) will +be created by default under `tests/ui-cargo`. Next, we'll open up these files and add our lint! @@ -113,7 +112,7 @@ For cargo lints, the process of testing differs in that we are interested in the `Cargo.toml` manifest file. We also need a minimal crate associated with that manifest. -If our new lint is named e.g. `foo_categories`, after running `cargo dev new_lint` +If our new lint is named e.g. `foo_categories`, after running `cargo dev new_lint` we will find by default two new crates, each with its manifest file: * `tests/ui-cargo/foo_categories/fail/Cargo.toml`: this file should cause the new lint to raise an error. diff --git a/src/tools/clippy/doc/basics.md b/src/tools/clippy/doc/basics.md new file mode 100644 index 00000000000..c81e7f6e069 --- /dev/null +++ b/src/tools/clippy/doc/basics.md @@ -0,0 +1,112 @@ +# Basics for hacking on Clippy + +This document explains the basics for hacking on Clippy. Besides others, this +includes how to set-up the development environment, how to build and how to test +Clippy. For a more in depth description on the codebase take a look at [Adding +Lints] or [Common Tools]. + +[Adding Lints]: https://github.com/rust-lang/rust-clippy/blob/master/doc/adding_lints.md +[Common Tools]: https://github.com/rust-lang/rust-clippy/blob/master/doc/common_tools_writing_lints.md + +- [Basics for hacking on Clippy](#basics-for-hacking-on-clippy) + - [Get the code](#get-the-code) + - [Setup](#setup) + - [Building and Testing](#building-and-testing) + - [`cargo dev`](#cargo-dev) + +## Get the Code + +First, make sure you have checked out the latest version of Clippy. If this is +your first time working on Clippy, create a fork of the repository and clone it +afterwards with the following command: + +```bash +git clone git@github.com:/rust-clippy +``` + +If you've already cloned Clippy in the past, update it to the latest version: + +```bash +# upstream has to be the remote of the rust-lang/rust-clippy repo +git fetch upstream +# make sure that you are on the master branch +git checkout master +# rebase your master branch on the upstream master +git rebase upstream/master +# push to the master branch of your fork +git push +``` + +## Setup + +Next we need to setup the toolchain to compile Clippy. Since Clippy heavily +relies on compiler internals it is build with the latest rustc master. To get +this toolchain, you can just use the `setup-toolchain.sh` script or use +`rustup-toolchain-install-master`: + +```bash +sh setup-toolchain.sh +# OR +cargo install rustup-toolchain-install-master +# For better IDE integration also add `-c rustfmt -c rust-src` (optional) +rustup-toolchain-install-master -f -n master -c rustc-dev -c llvm-tools +rustup override set master +``` + +_Note:_ Sometimes you may get compiler errors when building Clippy, even if you +didn't change anything. Normally those will be fixed by a maintainer in a few hours. + +## Building and Testing + +Once the `master` toolchain is installed, you can build and test Clippy like +every other Rust project: + +```bash +cargo build # builds Clippy +cargo test # tests Clippy +``` + +Since Clippy's test suite is pretty big, there are some commands that only run a +subset of Clippy's tests: + +```bash +# only run UI tests +cargo uitest +# only run UI tests starting with `test_` +TESTNAME="test_" cargo uitest +# only run dogfood tests +cargo test --test dogfood +``` + +If the output of a [UI test] differs from the expected output, you can update the +reference file with: + +```bash +sh tests/ui/update-all-references.sh +``` + +For example, this is necessary, if you fix a typo in an error message of a lint +or if you modify a test file to add a test case. + +_Note:_ This command may update more files than you intended. In that case only +commit the files you wanted to update. + +[UI test]: https://rustc-dev-guide.rust-lang.org/tests/adding.html#guide-to-the-ui-tests + +## `cargo dev` + +Clippy has some dev tools to make working on Clippy more convenient. These tools +can be accessed through the `cargo dev` command. Available tools are listed +below. To get more information about these commands, just call them with +`--help`. + +```bash +# formats the whole Clippy codebase and all tests +cargo dev fmt +# register or update lint names/groups/... +cargo dev update_lints +# create a new lint and register it +cargo dev new_lint +# (experimental) Setup Clippy to work with rust-analyzer +cargo dev ra-setup +``` diff --git a/src/tools/clippy/src/lintlist/mod.rs b/src/tools/clippy/src/lintlist/mod.rs index 1f3f70631fb..bbb300296be 100644 --- a/src/tools/clippy/src/lintlist/mod.rs +++ b/src/tools/clippy/src/lintlist/mod.rs @@ -360,6 +360,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "derive", }, + Lint { + name: "derive_ord_xor_partial_ord", + group: "correctness", + desc: "deriving `Ord` but implementing `PartialOrd` explicitly", + deprecation: None, + module: "derive", + }, Lint { name: "diverging_sub_expression", group: "complexity", @@ -405,7 +412,7 @@ pub static ref ALL_LINTS: Vec = vec![ Lint { name: "drop_bounds", group: "correctness", - desc: "Bounds of the form `T: Drop` are useless", + desc: "bounds of the form `T: Drop` are useless", deprecation: None, module: "drop_bounds", }, @@ -1452,6 +1459,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "bytecount", }, + Lint { + name: "needless_arbitrary_self_type", + group: "complexity", + desc: "type of `self` parameter is already by default `Self`", + deprecation: None, + module: "needless_arbitrary_self_type", + }, Lint { name: "needless_bool", group: "complexity", @@ -1928,6 +1942,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "copies", }, + Lint { + name: "same_item_push", + group: "style", + desc: "the same item is pushed inside of a for loop", + deprecation: None, + module: "loops", + }, Lint { name: "search_is_some", group: "complexity", @@ -2026,6 +2047,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "slow_vector_initialization", }, + Lint { + name: "stable_sort_primitive", + group: "perf", + desc: "use of sort() when sort_unstable() is equivalent", + deprecation: None, + module: "stable_sort_primitive", + }, Lint { name: "string_add", group: "restriction", @@ -2166,6 +2194,13 @@ pub static ref ALL_LINTS: Vec = vec![ deprecation: None, module: "misc", }, + Lint { + name: "trait_duplication_in_bounds", + group: "pedantic", + desc: "Check if the same trait bounds are specified twice during a function declaration", + deprecation: None, + module: "trait_bounds", + }, Lint { name: "transmute_bytes_to_str", group: "complexity", diff --git a/src/tools/clippy/tests/compile-test.rs b/src/tools/clippy/tests/compile-test.rs index 26a47d23706..697823712bf 100644 --- a/src/tools/clippy/tests/compile-test.rs +++ b/src/tools/clippy/tests/compile-test.rs @@ -3,7 +3,7 @@ use compiletest_rs as compiletest; use compiletest_rs::common::Mode as TestMode; -use std::env::{self, set_var}; +use std::env::{self, set_var, var}; use std::ffi::OsStr; use std::fs; use std::io; @@ -136,7 +136,9 @@ fn run_ui_toml(config: &mut compiletest::Config) { let tests = compiletest::make_tests(&config); + let manifest_dir = var("CARGO_MANIFEST_DIR").unwrap_or_default(); let res = run_tests(&config, tests); + set_var("CARGO_MANIFEST_DIR", &manifest_dir); match res { Ok(true) => {}, Ok(false) => panic!("Some tests failed"), @@ -147,9 +149,6 @@ fn run_ui_toml(config: &mut compiletest::Config) { } fn run_ui_cargo(config: &mut compiletest::Config) { - if cargo::is_rustc_test_suite() { - return; - } fn run_tests( config: &compiletest::Config, filter: &Option, @@ -217,6 +216,10 @@ fn run_ui_cargo(config: &mut compiletest::Config) { Ok(result) } + if cargo::is_rustc_test_suite() { + return; + } + config.mode = TestMode::Ui; config.src_base = Path::new("tests").join("ui-cargo").canonicalize().unwrap(); diff --git a/src/tools/clippy/tests/ui-toml/functions_maxlines/test.stderr b/src/tools/clippy/tests/ui-toml/functions_maxlines/test.stderr index 4b77ac551e7..fb12257021a 100644 --- a/src/tools/clippy/tests/ui-toml/functions_maxlines/test.stderr +++ b/src/tools/clippy/tests/ui-toml/functions_maxlines/test.stderr @@ -1,4 +1,4 @@ -error: This function has a large number of lines. +error: this function has a large number of lines --> $DIR/test.rs:18:1 | LL | / fn too_many_lines() { @@ -9,7 +9,7 @@ LL | | } | = note: `-D clippy::too-many-lines` implied by `-D warnings` -error: This function has a large number of lines. +error: this function has a large number of lines --> $DIR/test.rs:38:1 | LL | / fn comment_before_code() { diff --git a/src/tools/clippy/tests/ui/await_holding_lock.rs b/src/tools/clippy/tests/ui/await_holding_lock.rs index 5c1fdd83efb..0458950edee 100644 --- a/src/tools/clippy/tests/ui/await_holding_lock.rs +++ b/src/tools/clippy/tests/ui/await_holding_lock.rs @@ -47,6 +47,7 @@ async fn not_good(x: &Mutex) -> u32 { first + second + third } +#[allow(clippy::manual_async_fn)] fn block_bad(x: &Mutex) -> impl std::future::Future + '_ { async move { let guard = x.lock().unwrap(); diff --git a/src/tools/clippy/tests/ui/await_holding_lock.stderr b/src/tools/clippy/tests/ui/await_holding_lock.stderr index 8c47cb37d8c..21bf49d16f0 100644 --- a/src/tools/clippy/tests/ui/await_holding_lock.stderr +++ b/src/tools/clippy/tests/ui/await_holding_lock.stderr @@ -46,13 +46,13 @@ LL | | }; | |_____^ error: this MutexGuard is held across an 'await' point. Consider using an async-aware Mutex type or ensuring the MutexGuard is dropped before calling await. - --> $DIR/await_holding_lock.rs:52:13 + --> $DIR/await_holding_lock.rs:53:13 | LL | let guard = x.lock().unwrap(); | ^^^^^ | note: these are all the await points this lock is held through - --> $DIR/await_holding_lock.rs:52:9 + --> $DIR/await_holding_lock.rs:53:9 | LL | / let guard = x.lock().unwrap(); LL | | baz().await diff --git a/src/tools/clippy/tests/ui/bool_comparison.stderr b/src/tools/clippy/tests/ui/bool_comparison.stderr index eeb1f20ee89..55d94b8257d 100644 --- a/src/tools/clippy/tests/ui/bool_comparison.stderr +++ b/src/tools/clippy/tests/ui/bool_comparison.stderr @@ -84,25 +84,25 @@ error: order comparisons between booleans can be simplified LL | if x > y { | ^^^^^ help: try simplifying it as shown: `x & !y` -error: This comparison might be written more concisely +error: this comparison might be written more concisely --> $DIR/bool_comparison.rs:120:8 | LL | if a == !b {}; | ^^^^^^^ help: try simplifying it as shown: `a != b` -error: This comparison might be written more concisely +error: this comparison might be written more concisely --> $DIR/bool_comparison.rs:121:8 | LL | if !a == b {}; | ^^^^^^^ help: try simplifying it as shown: `a != b` -error: This comparison might be written more concisely +error: this comparison might be written more concisely --> $DIR/bool_comparison.rs:125:8 | LL | if b == !a {}; | ^^^^^^^ help: try simplifying it as shown: `b != a` -error: This comparison might be written more concisely +error: this comparison might be written more concisely --> $DIR/bool_comparison.rs:126:8 | LL | if !b == a {}; diff --git a/src/tools/clippy/tests/ui/builtin-type-shadow.stderr b/src/tools/clippy/tests/ui/builtin-type-shadow.stderr index bc785b075e0..f42b246afd2 100644 --- a/src/tools/clippy/tests/ui/builtin-type-shadow.stderr +++ b/src/tools/clippy/tests/ui/builtin-type-shadow.stderr @@ -1,4 +1,4 @@ -error: This generic shadows the built-in type `u32` +error: this generic shadows the built-in type `u32` --> $DIR/builtin-type-shadow.rs:4:8 | LL | fn foo(a: u32) -> u32 { diff --git a/src/tools/clippy/tests/ui/bytecount.stderr b/src/tools/clippy/tests/ui/bytecount.stderr index 436f5d86a06..1dc37fc8b25 100644 --- a/src/tools/clippy/tests/ui/bytecount.stderr +++ b/src/tools/clippy/tests/ui/bytecount.stderr @@ -1,8 +1,8 @@ -error: You appear to be counting bytes the naive way +error: you appear to be counting bytes the naive way --> $DIR/bytecount.rs:5:13 | LL | let _ = x.iter().filter(|&&a| a == 0).count(); // naive byte count - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: Consider using the bytecount crate: `bytecount::count(x, 0)` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, 0)` | note: the lint level is defined here --> $DIR/bytecount.rs:1:8 @@ -10,17 +10,17 @@ note: the lint level is defined here LL | #[deny(clippy::naive_bytecount)] | ^^^^^^^^^^^^^^^^^^^^^^^ -error: You appear to be counting bytes the naive way +error: you appear to be counting bytes the naive way --> $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)` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count((&x[..]), 0)` -error: You appear to be counting bytes the naive way +error: you appear to be counting bytes the naive way --> $DIR/bytecount.rs:19:13 | LL | let _ = x.iter().filter(|a| b + 1 == **a).count(); // naive byte count - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: Consider using the bytecount crate: `bytecount::count(x, b + 1)` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, b + 1)` error: aborting due to 3 previous errors diff --git a/src/tools/clippy/tests/ui/checked_conversions.stderr b/src/tools/clippy/tests/ui/checked_conversions.stderr index 648ba3ccd01..18518def0ac 100644 --- a/src/tools/clippy/tests/ui/checked_conversions.stderr +++ b/src/tools/clippy/tests/ui/checked_conversions.stderr @@ -1,4 +1,4 @@ -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:17:13 | LL | let _ = value <= (u32::max_value() as i64) && value >= 0; @@ -6,91 +6,91 @@ LL | let _ = value <= (u32::max_value() as i64) && value >= 0; | = note: `-D clippy::checked-conversions` implied by `-D warnings` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:18:13 | LL | let _ = value <= (u32::MAX as i64) && value >= 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u32::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:22:13 | LL | let _ = value <= i64::from(u16::max_value()) && value >= 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:23:13 | LL | let _ = value <= i64::from(u16::MAX) && value >= 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:27:13 | LL | let _ = value <= (u8::max_value() as isize) && value >= 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:28:13 | LL | let _ = value <= (u8::MAX as isize) && value >= 0; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u8::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:34:13 | LL | let _ = value <= (i32::max_value() as i64) && value >= (i32::min_value() as i64); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:35:13 | LL | let _ = value <= (i32::MAX as i64) && value >= (i32::MIN as i64); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:39:13 | LL | let _ = value <= i64::from(i16::max_value()) && value >= i64::from(i16::min_value()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:40:13 | LL | let _ = value <= i64::from(i16::MAX) && value >= i64::from(i16::MIN); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i16::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:46:13 | LL | let _ = value <= i32::max_value() as u32; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:47:13 | LL | let _ = value <= i32::MAX as u32; | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `i32::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:51:13 | LL | let _ = value <= isize::max_value() as usize && value as i32 == 5; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:52:13 | LL | let _ = value <= isize::MAX as usize && value as i32 == 5; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `isize::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:56:13 | LL | let _ = value <= u16::max_value() as u32 && value as i32 == 5; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `u16::try_from(value).is_ok()` -error: Checked cast can be simplified. +error: checked cast can be simplified --> $DIR/checked_conversions.rs:57:13 | LL | let _ = value <= u16::MAX as u32 && value as i32 == 5; diff --git a/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals.stderr b/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals.stderr index dc666bab460..33bb5136ef8 100644 --- a/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals.stderr +++ b/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals.stderr @@ -1,4 +1,4 @@ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:8:9 | LL | if x.is_ok() && y.is_err() { @@ -12,7 +12,7 @@ note: the lint level is defined here LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/complex_conditionals.rs:9:9 | LL | if x.is_ok() && y.is_err() { @@ -27,7 +27,7 @@ note: the lint level is defined here LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:10:9 | LL | if x.is_ok() && y.is_err() { @@ -36,7 +36,7 @@ LL | if x.is_ok() && y.is_err() { LL | y.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:11:9 | LL | if x.is_ok() && y.is_err() { @@ -45,7 +45,7 @@ LL | if x.is_ok() && y.is_err() { LL | y.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:25:9 | LL | if x.is_ok() || y.is_ok() { @@ -54,7 +54,7 @@ LL | if x.is_ok() || y.is_ok() { LL | x.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:26:9 | LL | if x.is_ok() || y.is_ok() { @@ -63,7 +63,7 @@ LL | if x.is_ok() || y.is_ok() { LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:27:9 | LL | if x.is_ok() || y.is_ok() { @@ -72,7 +72,7 @@ LL | if x.is_ok() || y.is_ok() { LL | y.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:28:9 | LL | if x.is_ok() || y.is_ok() { @@ -81,7 +81,7 @@ LL | if x.is_ok() || y.is_ok() { LL | y.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:32:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -89,7 +89,7 @@ LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/complex_conditionals.rs:33:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -98,7 +98,7 @@ LL | x.unwrap(); // unnecessary LL | x.unwrap_err(); // will panic | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:34:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -107,7 +107,7 @@ LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { LL | y.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:35:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -116,7 +116,7 @@ LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { LL | y.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:36:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -125,7 +125,7 @@ LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { LL | z.unwrap(); // unnecessary | ^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/complex_conditionals.rs:37:9 | LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { @@ -134,7 +134,7 @@ LL | if x.is_ok() && !(y.is_ok() || z.is_err()) { LL | z.unwrap_err(); // will panic | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:45:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { @@ -143,7 +143,7 @@ LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { LL | x.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:46:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { @@ -152,7 +152,7 @@ LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:47:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { @@ -161,7 +161,7 @@ LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { LL | y.unwrap(); // unnecessary | ^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/complex_conditionals.rs:48:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { @@ -170,7 +170,7 @@ LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { LL | y.unwrap_err(); // will panic | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals.rs:49:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { @@ -179,7 +179,7 @@ LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { LL | z.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals.rs:50:9 | LL | if x.is_ok() || !(y.is_ok() && z.is_err()) { diff --git a/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals_nested.stderr b/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals_nested.stderr index e4d085470c3..a01f7f956f6 100644 --- a/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals_nested.stderr +++ b/src/tools/clippy/tests/ui/checked_unwrap/complex_conditionals_nested.stderr @@ -1,4 +1,4 @@ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/complex_conditionals_nested.rs:8:13 | LL | if x.is_some() { @@ -12,7 +12,7 @@ note: the lint level is defined here LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/complex_conditionals_nested.rs:10:13 | LL | if x.is_some() { diff --git a/src/tools/clippy/tests/ui/checked_unwrap/simple_conditionals.stderr b/src/tools/clippy/tests/ui/checked_unwrap/simple_conditionals.stderr index 4013d1ed667..416ec1a01ab 100644 --- a/src/tools/clippy/tests/ui/checked_unwrap/simple_conditionals.stderr +++ b/src/tools/clippy/tests/ui/checked_unwrap/simple_conditionals.stderr @@ -1,4 +1,4 @@ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:39:9 | LL | if x.is_some() { @@ -12,7 +12,7 @@ note: the lint level is defined here LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/simple_conditionals.rs:41:9 | LL | if x.is_some() { @@ -27,7 +27,7 @@ note: the lint level is defined here LL | #![deny(clippy::panicking_unwrap, clippy::unnecessary_unwrap)] | ^^^^^^^^^^^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/simple_conditionals.rs:44:9 | LL | if x.is_none() { @@ -35,7 +35,7 @@ LL | if x.is_none() { LL | x.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:46:9 | LL | if x.is_none() { @@ -44,7 +44,7 @@ LL | if x.is_none() { LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:7:13 | LL | if $a.is_some() { @@ -57,7 +57,7 @@ LL | m!(x); | = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:54:9 | LL | if x.is_ok() { @@ -65,7 +65,7 @@ LL | if x.is_ok() { LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/simple_conditionals.rs:55:9 | LL | if x.is_ok() { @@ -74,7 +74,7 @@ LL | x.unwrap(); // unnecessary LL | x.unwrap_err(); // will panic | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/simple_conditionals.rs:57:9 | LL | if x.is_ok() { @@ -83,7 +83,7 @@ LL | if x.is_ok() { LL | x.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:58:9 | LL | if x.is_ok() { @@ -92,7 +92,7 @@ LL | if x.is_ok() { LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: This call to `unwrap()` will always panic. +error: this call to `unwrap()` will always panic --> $DIR/simple_conditionals.rs:61:9 | LL | if x.is_err() { @@ -100,7 +100,7 @@ LL | if x.is_err() { LL | x.unwrap(); // will panic | ^^^^^^^^^^ -error: You checked before that `unwrap_err()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap_err()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:62:9 | LL | if x.is_err() { @@ -109,7 +109,7 @@ LL | x.unwrap(); // will panic LL | x.unwrap_err(); // unnecessary | ^^^^^^^^^^^^^^ -error: You checked before that `unwrap()` cannot fail. Instead of checking and unwrapping, it's better to use `if let` or `match`. +error: you checked before that `unwrap()` cannot fail, instead of checking and unwrapping, it's better to use `if let` or `match` --> $DIR/simple_conditionals.rs:64:9 | LL | if x.is_err() { @@ -118,7 +118,7 @@ LL | if x.is_err() { LL | x.unwrap(); // unnecessary | ^^^^^^^^^^ -error: This call to `unwrap_err()` will always panic. +error: this call to `unwrap_err()` will always panic --> $DIR/simple_conditionals.rs:65:9 | LL | if x.is_err() { diff --git a/src/tools/clippy/tests/ui/cmp_null.stderr b/src/tools/clippy/tests/ui/cmp_null.stderr index b563a2ebec2..a1f4c70fb27 100644 --- a/src/tools/clippy/tests/ui/cmp_null.stderr +++ b/src/tools/clippy/tests/ui/cmp_null.stderr @@ -1,4 +1,4 @@ -error: Comparing with null is better expressed by the `.is_null()` method +error: comparing with null is better expressed by the `.is_null()` method --> $DIR/cmp_null.rs:9:8 | LL | if p == ptr::null() { @@ -6,7 +6,7 @@ LL | if p == ptr::null() { | = note: `-D clippy::cmp-null` implied by `-D warnings` -error: Comparing with null is better expressed by the `.is_null()` method +error: comparing with null is better expressed by the `.is_null()` method --> $DIR/cmp_null.rs:14:8 | LL | if m == ptr::null_mut() { diff --git a/src/tools/clippy/tests/ui/crashes/ice-5872.rs b/src/tools/clippy/tests/ui/crashes/ice-5872.rs new file mode 100644 index 00000000000..68afa8f8c3a --- /dev/null +++ b/src/tools/clippy/tests/ui/crashes/ice-5872.rs @@ -0,0 +1,5 @@ +#![warn(clippy::needless_collect)] + +fn main() { + let _ = vec![1, 2, 3].into_iter().collect::>().is_empty(); +} diff --git a/src/tools/clippy/tests/ui/crashes/ice-5872.stderr b/src/tools/clippy/tests/ui/crashes/ice-5872.stderr new file mode 100644 index 00000000000..a60ca345cf7 --- /dev/null +++ b/src/tools/clippy/tests/ui/crashes/ice-5872.stderr @@ -0,0 +1,10 @@ +error: avoid using `collect()` when not needed + --> $DIR/ice-5872.rs:4:39 + | +LL | let _ = vec![1, 2, 3].into_iter().collect::>().is_empty(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()` + | + = note: `-D clippy::needless-collect` implied by `-D warnings` + +error: aborting due to previous error + diff --git a/src/tools/clippy/tests/ui/default_trait_access.stderr b/src/tools/clippy/tests/ui/default_trait_access.stderr index 453760c6b92..26b2057548b 100644 --- a/src/tools/clippy/tests/ui/default_trait_access.stderr +++ b/src/tools/clippy/tests/ui/default_trait_access.stderr @@ -1,4 +1,4 @@ -error: Calling `std::string::String::default()` is more clear than this expression +error: calling `std::string::String::default()` is more clear than this expression --> $DIR/default_trait_access.rs:8:22 | LL | let s1: String = Default::default(); @@ -6,43 +6,43 @@ LL | let s1: String = Default::default(); | = note: `-D clippy::default-trait-access` implied by `-D warnings` -error: Calling `std::string::String::default()` is more clear than this expression +error: calling `std::string::String::default()` is more clear than this expression --> $DIR/default_trait_access.rs:12:22 | LL | let s3: String = D2::default(); | ^^^^^^^^^^^^^ help: try: `std::string::String::default()` -error: Calling `std::string::String::default()` is more clear than this expression +error: calling `std::string::String::default()` is more clear than this expression --> $DIR/default_trait_access.rs:14:22 | LL | let s4: String = std::default::Default::default(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()` -error: Calling `std::string::String::default()` is more clear than this expression +error: calling `std::string::String::default()` is more clear than this expression --> $DIR/default_trait_access.rs:18:22 | LL | let s6: String = default::Default::default(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `std::string::String::default()` -error: Calling `GenericDerivedDefault::default()` is more clear than this expression +error: calling `GenericDerivedDefault::default()` is more clear than this expression --> $DIR/default_trait_access.rs:28:46 | LL | let s11: GenericDerivedDefault = Default::default(); | ^^^^^^^^^^^^^^^^^^ help: try: `GenericDerivedDefault::default()` -error: Calling `TupleDerivedDefault::default()` is more clear than this expression +error: calling `TupleDerivedDefault::default()` is more clear than this expression --> $DIR/default_trait_access.rs:34:36 | LL | let s14: TupleDerivedDefault = Default::default(); | ^^^^^^^^^^^^^^^^^^ help: try: `TupleDerivedDefault::default()` -error: Calling `ArrayDerivedDefault::default()` is more clear than this expression +error: calling `ArrayDerivedDefault::default()` is more clear than this expression --> $DIR/default_trait_access.rs:36:36 | LL | let s15: ArrayDerivedDefault = Default::default(); | ^^^^^^^^^^^^^^^^^^ help: try: `ArrayDerivedDefault::default()` -error: Calling `TupleStructDerivedDefault::default()` is more clear than this expression +error: calling `TupleStructDerivedDefault::default()` is more clear than this expression --> $DIR/default_trait_access.rs:40:42 | LL | let s17: TupleStructDerivedDefault = Default::default(); diff --git a/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.rs b/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.rs new file mode 100644 index 00000000000..b82dc518a3b --- /dev/null +++ b/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.rs @@ -0,0 +1,68 @@ +#![warn(clippy::derive_ord_xor_partial_ord)] + +use std::cmp::Ordering; + +#[derive(PartialOrd, Ord, PartialEq, Eq)] +struct DeriveBoth; + +impl PartialEq for DeriveBoth { + fn eq(&self, _: &u64) -> bool { + true + } +} + +impl PartialOrd for DeriveBoth { + fn partial_cmp(&self, _: &u64) -> Option { + Some(Ordering::Equal) + } +} + +#[derive(Ord, PartialEq, Eq)] +struct DeriveOrd; + +impl PartialOrd for DeriveOrd { + fn partial_cmp(&self, other: &Self) -> Option { + Some(other.cmp(self)) + } +} + +#[derive(Ord, PartialEq, Eq)] +struct DeriveOrdWithExplicitTypeVariable; + +impl PartialOrd for DeriveOrdWithExplicitTypeVariable { + fn partial_cmp(&self, other: &Self) -> Option { + Some(other.cmp(self)) + } +} + +#[derive(PartialOrd, PartialEq, Eq)] +struct DerivePartialOrd; + +impl std::cmp::Ord for DerivePartialOrd { + fn cmp(&self, other: &Self) -> Ordering { + Ordering::Less + } +} + +#[derive(PartialOrd, PartialEq, Eq)] +struct ImplUserOrd; + +trait Ord {} + +// We don't want to lint on user-defined traits called `Ord` +impl Ord for ImplUserOrd {} + +mod use_ord { + use std::cmp::{Ord, Ordering}; + + #[derive(PartialOrd, PartialEq, Eq)] + struct DerivePartialOrdInUseOrd; + + impl Ord for DerivePartialOrdInUseOrd { + fn cmp(&self, other: &Self) -> Ordering { + Ordering::Less + } + } +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.stderr b/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.stderr new file mode 100644 index 00000000000..66bc4d42ce8 --- /dev/null +++ b/src/tools/clippy/tests/ui/derive_ord_xor_partial_ord.stderr @@ -0,0 +1,71 @@ +error: you are deriving `Ord` but have implemented `PartialOrd` explicitly + --> $DIR/derive_ord_xor_partial_ord.rs:20:10 + | +LL | #[derive(Ord, PartialEq, Eq)] + | ^^^ + | + = note: `-D clippy::derive-ord-xor-partial-ord` implied by `-D warnings` +note: `PartialOrd` implemented here + --> $DIR/derive_ord_xor_partial_ord.rs:23:1 + | +LL | / impl PartialOrd for DeriveOrd { +LL | | fn partial_cmp(&self, other: &Self) -> Option { +LL | | Some(other.cmp(self)) +LL | | } +LL | | } + | |_^ + = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info) + +error: you are deriving `Ord` but have implemented `PartialOrd` explicitly + --> $DIR/derive_ord_xor_partial_ord.rs:29:10 + | +LL | #[derive(Ord, PartialEq, Eq)] + | ^^^ + | +note: `PartialOrd` implemented here + --> $DIR/derive_ord_xor_partial_ord.rs:32:1 + | +LL | / impl PartialOrd for DeriveOrdWithExplicitTypeVariable { +LL | | fn partial_cmp(&self, other: &Self) -> Option { +LL | | Some(other.cmp(self)) +LL | | } +LL | | } + | |_^ + = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info) + +error: you are implementing `Ord` explicitly but have derived `PartialOrd` + --> $DIR/derive_ord_xor_partial_ord.rs:41:1 + | +LL | / impl std::cmp::Ord for DerivePartialOrd { +LL | | fn cmp(&self, other: &Self) -> Ordering { +LL | | Ordering::Less +LL | | } +LL | | } + | |_^ + | +note: `PartialOrd` implemented here + --> $DIR/derive_ord_xor_partial_ord.rs:38:10 + | +LL | #[derive(PartialOrd, PartialEq, Eq)] + | ^^^^^^^^^^ + = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info) + +error: you are implementing `Ord` explicitly but have derived `PartialOrd` + --> $DIR/derive_ord_xor_partial_ord.rs:61:5 + | +LL | / impl Ord for DerivePartialOrdInUseOrd { +LL | | fn cmp(&self, other: &Self) -> Ordering { +LL | | Ordering::Less +LL | | } +LL | | } + | |_____^ + | +note: `PartialOrd` implemented here + --> $DIR/derive_ord_xor_partial_ord.rs:58:14 + | +LL | #[derive(PartialOrd, PartialEq, Eq)] + | ^^^^^^^^^^ + = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info) + +error: aborting due to 4 previous errors + diff --git a/src/tools/clippy/tests/ui/double_comparison.stderr b/src/tools/clippy/tests/ui/double_comparison.stderr index 5dcda7b3af4..05ef4e25f7f 100644 --- a/src/tools/clippy/tests/ui/double_comparison.stderr +++ b/src/tools/clippy/tests/ui/double_comparison.stderr @@ -1,4 +1,4 @@ -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:6:8 | LL | if x == y || x < y { @@ -6,43 +6,43 @@ LL | if x == y || x < y { | = note: `-D clippy::double-comparisons` implied by `-D warnings` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:9:8 | LL | if x < y || x == y { | ^^^^^^^^^^^^^^^ help: try: `x <= y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:12:8 | LL | if x == y || x > y { | ^^^^^^^^^^^^^^^ help: try: `x >= y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:15:8 | LL | if x > y || x == y { | ^^^^^^^^^^^^^^^ help: try: `x >= y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:18:8 | LL | if x < y || x > y { | ^^^^^^^^^^^^^^ help: try: `x != y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:21:8 | LL | if x > y || x < y { | ^^^^^^^^^^^^^^ help: try: `x != y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:24:8 | LL | if x <= y && x >= y { | ^^^^^^^^^^^^^^^^ help: try: `x == y` -error: This binary expression can be simplified +error: this binary expression can be simplified --> $DIR/double_comparison.rs:27:8 | LL | if x >= y && x <= y { diff --git a/src/tools/clippy/tests/ui/double_parens.stderr b/src/tools/clippy/tests/ui/double_parens.stderr index 0e4c9b5682d..40fcad2ab1d 100644 --- a/src/tools/clippy/tests/ui/double_parens.stderr +++ b/src/tools/clippy/tests/ui/double_parens.stderr @@ -1,4 +1,4 @@ -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:15:5 | LL | ((0)) @@ -6,31 +6,31 @@ LL | ((0)) | = note: `-D clippy::double-parens` implied by `-D warnings` -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:19:14 | LL | dummy_fn((0)); | ^^^ -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:23:20 | LL | x.dummy_method((0)); | ^^^ -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:27:5 | LL | ((1, 2)) | ^^^^^^^^ -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:31:5 | LL | (()) | ^^^^ -error: Consider removing unnecessary double parentheses +error: consider removing unnecessary double parentheses --> $DIR/double_parens.rs:53:16 | LL | assert_eq!(((1, 2)), (1, 2), "Error"); diff --git a/src/tools/clippy/tests/ui/drop_bounds.stderr b/src/tools/clippy/tests/ui/drop_bounds.stderr index 5d360ef30a1..8208c0ed7e3 100644 --- a/src/tools/clippy/tests/ui/drop_bounds.stderr +++ b/src/tools/clippy/tests/ui/drop_bounds.stderr @@ -1,4 +1,4 @@ -error: Bounds of the form `T: Drop` are useless. Use `std::mem::needs_drop` to detect if a type has drop glue. +error: bounds of the form `T: Drop` are useless, use `std::mem::needs_drop` to detect if a type has drop glue --> $DIR/drop_bounds.rs:2:11 | LL | fn foo() {} @@ -6,7 +6,7 @@ LL | fn foo() {} | = note: `#[deny(clippy::drop_bounds)]` on by default -error: Bounds of the form `T: Drop` are useless. Use `std::mem::needs_drop` to detect if a type has drop glue. +error: bounds of the form `T: Drop` are useless, use `std::mem::needs_drop` to detect if a type has drop glue --> $DIR/drop_bounds.rs:5:8 | LL | T: Drop, diff --git a/src/tools/clippy/tests/ui/empty_line_after_outer_attribute.stderr b/src/tools/clippy/tests/ui/empty_line_after_outer_attribute.stderr index bf753a732f0..594fca44a32 100644 --- a/src/tools/clippy/tests/ui/empty_line_after_outer_attribute.stderr +++ b/src/tools/clippy/tests/ui/empty_line_after_outer_attribute.stderr @@ -1,4 +1,4 @@ -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:11:1 | LL | / #[crate_type = "lib"] @@ -9,7 +9,7 @@ LL | | fn with_one_newline_and_comment() { assert!(true) } | = note: `-D clippy::empty-line-after-outer-attr` implied by `-D warnings` -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:23:1 | LL | / #[crate_type = "lib"] @@ -17,7 +17,7 @@ LL | | LL | | fn with_one_newline() { assert!(true) } | |_ -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:28:1 | LL | / #[crate_type = "lib"] @@ -26,7 +26,7 @@ LL | | LL | | fn with_two_newlines() { assert!(true) } | |_ -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:35:1 | LL | / #[crate_type = "lib"] @@ -34,7 +34,7 @@ LL | | LL | | enum Baz { | |_ -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:43:1 | LL | / #[crate_type = "lib"] @@ -42,7 +42,7 @@ LL | | LL | | struct Foo { | |_ -error: Found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? +error: found an empty line after an outer attribute. Perhaps you forgot to add a `!` to make it an inner attribute? --> $DIR/empty_line_after_outer_attribute.rs:51:1 | LL | / #[crate_type = "lib"] diff --git a/src/tools/clippy/tests/ui/extra_unused_lifetimes.rs b/src/tools/clippy/tests/ui/extra_unused_lifetimes.rs index ddbf4e98c51..150acfbfee7 100644 --- a/src/tools/clippy/tests/ui/extra_unused_lifetimes.rs +++ b/src/tools/clippy/tests/ui/extra_unused_lifetimes.rs @@ -1,4 +1,10 @@ -#![allow(unused, dead_code, clippy::needless_lifetimes, clippy::needless_pass_by_value)] +#![allow( + unused, + dead_code, + clippy::needless_lifetimes, + clippy::needless_pass_by_value, + clippy::needless_arbitrary_self_type +)] #![warn(clippy::extra_unused_lifetimes)] fn empty() {} diff --git a/src/tools/clippy/tests/ui/extra_unused_lifetimes.stderr b/src/tools/clippy/tests/ui/extra_unused_lifetimes.stderr index 16bbb1c037d..ebdb8e74952 100644 --- a/src/tools/clippy/tests/ui/extra_unused_lifetimes.stderr +++ b/src/tools/clippy/tests/ui/extra_unused_lifetimes.stderr @@ -1,5 +1,5 @@ error: this lifetime isn't used in the function definition - --> $DIR/extra_unused_lifetimes.rs:8:14 + --> $DIR/extra_unused_lifetimes.rs:14:14 | LL | fn unused_lt<'a>(x: u8) {} | ^^ @@ -7,19 +7,19 @@ LL | fn unused_lt<'a>(x: u8) {} = note: `-D clippy::extra-unused-lifetimes` implied by `-D warnings` error: this lifetime isn't used in the function definition - --> $DIR/extra_unused_lifetimes.rs:10:25 + --> $DIR/extra_unused_lifetimes.rs:16:25 | LL | fn unused_lt_transitive<'a, 'b: 'a>(x: &'b u8) { | ^^ error: this lifetime isn't used in the function definition - --> $DIR/extra_unused_lifetimes.rs:35:10 + --> $DIR/extra_unused_lifetimes.rs:41:10 | LL | fn x<'a>(&self) {} | ^^ error: this lifetime isn't used in the function definition - --> $DIR/extra_unused_lifetimes.rs:61:22 + --> $DIR/extra_unused_lifetimes.rs:67:22 | LL | fn unused_lt<'a>(x: u8) {} | ^^ diff --git a/src/tools/clippy/tests/ui/functions_maxlines.stderr b/src/tools/clippy/tests/ui/functions_maxlines.stderr index 9b0e7550cc3..c640c82d6d7 100644 --- a/src/tools/clippy/tests/ui/functions_maxlines.stderr +++ b/src/tools/clippy/tests/ui/functions_maxlines.stderr @@ -1,4 +1,4 @@ -error: This function has a large number of lines. +error: this function has a large number of lines --> $DIR/functions_maxlines.rs:58:1 | LL | / fn bad_lines() { diff --git a/src/tools/clippy/tests/ui/iter_skip_next.fixed b/src/tools/clippy/tests/ui/iter_skip_next.fixed new file mode 100644 index 00000000000..928b6acb951 --- /dev/null +++ b/src/tools/clippy/tests/ui/iter_skip_next.fixed @@ -0,0 +1,22 @@ +// run-rustfix +// aux-build:option_helpers.rs + +#![warn(clippy::iter_skip_next)] +#![allow(clippy::blacklisted_name)] +#![allow(clippy::iter_nth)] + +extern crate option_helpers; + +use option_helpers::IteratorFalsePositives; + +/// Checks implementation of `ITER_SKIP_NEXT` lint +fn main() { + let some_vec = vec![0, 1, 2, 3]; + let _ = some_vec.iter().nth(42); + let _ = some_vec.iter().cycle().nth(42); + let _ = (1..10).nth(10); + let _ = &some_vec[..].iter().nth(3); + let foo = IteratorFalsePositives { foo: 0 }; + let _ = foo.skip(42).next(); + let _ = foo.filter().skip(42).next(); +} diff --git a/src/tools/clippy/tests/ui/iter_skip_next.rs b/src/tools/clippy/tests/ui/iter_skip_next.rs index a65ca3bbb13..7075e2598eb 100644 --- a/src/tools/clippy/tests/ui/iter_skip_next.rs +++ b/src/tools/clippy/tests/ui/iter_skip_next.rs @@ -1,15 +1,17 @@ +// run-rustfix // aux-build:option_helpers.rs #![warn(clippy::iter_skip_next)] #![allow(clippy::blacklisted_name)] +#![allow(clippy::iter_nth)] extern crate option_helpers; use option_helpers::IteratorFalsePositives; /// Checks implementation of `ITER_SKIP_NEXT` lint -fn iter_skip_next() { - let mut some_vec = vec![0, 1, 2, 3]; +fn main() { + let some_vec = vec![0, 1, 2, 3]; let _ = some_vec.iter().skip(42).next(); let _ = some_vec.iter().cycle().skip(42).next(); let _ = (1..10).skip(10).next(); @@ -18,5 +20,3 @@ fn iter_skip_next() { let _ = foo.skip(42).next(); let _ = foo.filter().skip(42).next(); } - -fn main() {} diff --git a/src/tools/clippy/tests/ui/iter_skip_next.stderr b/src/tools/clippy/tests/ui/iter_skip_next.stderr index 5709f335529..feedc2f288a 100644 --- a/src/tools/clippy/tests/ui/iter_skip_next.stderr +++ b/src/tools/clippy/tests/ui/iter_skip_next.stderr @@ -1,35 +1,28 @@ error: called `skip(x).next()` on an iterator - --> $DIR/iter_skip_next.rs:13:13 + --> $DIR/iter_skip_next.rs:15:28 | LL | let _ = some_vec.iter().skip(42).next(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | ^^^^^^^^^^^^^^^^ help: use `nth` instead: `.nth(42)` | = note: `-D clippy::iter-skip-next` implied by `-D warnings` - = help: this is more succinctly expressed by calling `nth(x)` error: called `skip(x).next()` on an iterator - --> $DIR/iter_skip_next.rs:14:13 + --> $DIR/iter_skip_next.rs:16:36 | LL | let _ = some_vec.iter().cycle().skip(42).next(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = help: this is more succinctly expressed by calling `nth(x)` + | ^^^^^^^^^^^^^^^^ help: use `nth` instead: `.nth(42)` error: called `skip(x).next()` on an iterator - --> $DIR/iter_skip_next.rs:15:13 + --> $DIR/iter_skip_next.rs:17:20 | LL | let _ = (1..10).skip(10).next(); - | ^^^^^^^^^^^^^^^^^^^^^^^ - | - = help: this is more succinctly expressed by calling `nth(x)` + | ^^^^^^^^^^^^^^^^ help: use `nth` instead: `.nth(10)` error: called `skip(x).next()` on an iterator - --> $DIR/iter_skip_next.rs:16:14 + --> $DIR/iter_skip_next.rs:18:33 | LL | let _ = &some_vec[..].iter().skip(3).next(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | - = help: this is more succinctly expressed by calling `nth(x)` + | ^^^^^^^^^^^^^^^ help: use `nth` instead: `.nth(3)` error: aborting due to 4 previous errors diff --git a/src/tools/clippy/tests/ui/len_without_is_empty.rs b/src/tools/clippy/tests/ui/len_without_is_empty.rs index 3ef29dd6388..b5211318a15 100644 --- a/src/tools/clippy/tests/ui/len_without_is_empty.rs +++ b/src/tools/clippy/tests/ui/len_without_is_empty.rs @@ -4,14 +4,14 @@ pub struct PubOne; impl PubOne { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } } impl PubOne { // A second impl for this struct -- the error span shouldn't mention this. - pub fn irrelevant(self: &Self) -> bool { + pub fn irrelevant(&self) -> bool { false } } @@ -21,7 +21,7 @@ pub struct PubAllowed; #[allow(clippy::len_without_is_empty)] impl PubAllowed { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } } @@ -29,17 +29,17 @@ impl PubAllowed { // No `allow` attribute on this impl block, but that doesn't matter -- we only require one on the // impl containing `len`. impl PubAllowed { - pub fn irrelevant(self: &Self) -> bool { + pub fn irrelevant(&self) -> bool { false } } pub trait PubTraitsToo { - fn len(self: &Self) -> isize; + fn len(&self) -> isize; } impl PubTraitsToo for One { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 0 } } @@ -47,11 +47,11 @@ impl PubTraitsToo for One { pub struct HasIsEmpty; impl HasIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } @@ -59,11 +59,11 @@ impl HasIsEmpty { pub struct HasWrongIsEmpty; impl HasWrongIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - pub fn is_empty(self: &Self, x: u32) -> bool { + pub fn is_empty(&self, x: u32) -> bool { false } } @@ -71,7 +71,7 @@ impl HasWrongIsEmpty { struct NotPubOne; impl NotPubOne { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { // No error; `len` is pub but `NotPubOne` is not exported anyway. 1 } @@ -80,19 +80,19 @@ impl NotPubOne { struct One; impl One { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { // No error; `len` is private; see issue #1085. 1 } } trait TraitsToo { - fn len(self: &Self) -> isize; + fn len(&self) -> isize; // No error; `len` is private; see issue #1085. } impl TraitsToo for One { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 0 } } @@ -100,11 +100,11 @@ impl TraitsToo for One { struct HasPrivateIsEmpty; impl HasPrivateIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } @@ -112,16 +112,16 @@ impl HasPrivateIsEmpty { struct Wither; pub trait WithIsEmpty { - fn len(self: &Self) -> isize; - fn is_empty(self: &Self) -> bool; + fn len(&self) -> isize; + fn is_empty(&self) -> bool; } impl WithIsEmpty for Wither { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } diff --git a/src/tools/clippy/tests/ui/len_without_is_empty.stderr b/src/tools/clippy/tests/ui/len_without_is_empty.stderr index 4493b17a4b4..d79c300c074 100644 --- a/src/tools/clippy/tests/ui/len_without_is_empty.stderr +++ b/src/tools/clippy/tests/ui/len_without_is_empty.stderr @@ -2,7 +2,7 @@ error: item `PubOne` has a public `len` method but no corresponding `is_empty` m --> $DIR/len_without_is_empty.rs:6:1 | LL | / impl PubOne { -LL | | pub fn len(self: &Self) -> isize { +LL | | pub fn len(&self) -> isize { LL | | 1 LL | | } LL | | } @@ -14,7 +14,7 @@ error: trait `PubTraitsToo` has a `len` method but no (possibly inherited) `is_e --> $DIR/len_without_is_empty.rs:37:1 | LL | / pub trait PubTraitsToo { -LL | | fn len(self: &Self) -> isize; +LL | | fn len(&self) -> isize; LL | | } | |_^ @@ -22,7 +22,7 @@ error: item `HasIsEmpty` has a public `len` method but a private `is_empty` meth --> $DIR/len_without_is_empty.rs:49:1 | LL | / impl HasIsEmpty { -LL | | pub fn len(self: &Self) -> isize { +LL | | pub fn len(&self) -> isize { LL | | 1 LL | | } ... | @@ -34,7 +34,7 @@ error: item `HasWrongIsEmpty` has a public `len` method but no corresponding `is --> $DIR/len_without_is_empty.rs:61:1 | LL | / impl HasWrongIsEmpty { -LL | | pub fn len(self: &Self) -> isize { +LL | | pub fn len(&self) -> isize { LL | | 1 LL | | } ... | diff --git a/src/tools/clippy/tests/ui/len_zero.fixed b/src/tools/clippy/tests/ui/len_zero.fixed index a29b832eb60..d81676a3d9f 100644 --- a/src/tools/clippy/tests/ui/len_zero.fixed +++ b/src/tools/clippy/tests/ui/len_zero.fixed @@ -7,12 +7,12 @@ pub struct One; struct Wither; trait TraitsToo { - fn len(self: &Self) -> isize; + fn len(&self) -> isize; // No error; `len` is private; see issue #1085. } impl TraitsToo for One { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 0 } } @@ -20,11 +20,11 @@ impl TraitsToo for One { pub struct HasIsEmpty; impl HasIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } @@ -32,26 +32,26 @@ impl HasIsEmpty { pub struct HasWrongIsEmpty; impl HasWrongIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - pub fn is_empty(self: &Self, x: u32) -> bool { + pub fn is_empty(&self, x: u32) -> bool { false } } pub trait WithIsEmpty { - fn len(self: &Self) -> isize; - fn is_empty(self: &Self) -> bool; + fn len(&self) -> isize; + fn is_empty(&self) -> bool; } impl WithIsEmpty for Wither { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } diff --git a/src/tools/clippy/tests/ui/len_zero.rs b/src/tools/clippy/tests/ui/len_zero.rs index 8fd0093f4fd..ecdba921a5d 100644 --- a/src/tools/clippy/tests/ui/len_zero.rs +++ b/src/tools/clippy/tests/ui/len_zero.rs @@ -7,12 +7,12 @@ pub struct One; struct Wither; trait TraitsToo { - fn len(self: &Self) -> isize; + fn len(&self) -> isize; // No error; `len` is private; see issue #1085. } impl TraitsToo for One { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 0 } } @@ -20,11 +20,11 @@ impl TraitsToo for One { pub struct HasIsEmpty; impl HasIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } @@ -32,26 +32,26 @@ impl HasIsEmpty { pub struct HasWrongIsEmpty; impl HasWrongIsEmpty { - pub fn len(self: &Self) -> isize { + pub fn len(&self) -> isize { 1 } - pub fn is_empty(self: &Self, x: u32) -> bool { + pub fn is_empty(&self, x: u32) -> bool { false } } pub trait WithIsEmpty { - fn len(self: &Self) -> isize; - fn is_empty(self: &Self) -> bool; + fn len(&self) -> isize; + fn is_empty(&self) -> bool; } impl WithIsEmpty for Wither { - fn len(self: &Self) -> isize { + fn len(&self) -> isize { 1 } - fn is_empty(self: &Self) -> bool { + fn is_empty(&self) -> bool { false } } diff --git a/src/tools/clippy/tests/ui/manual_async_fn.fixed b/src/tools/clippy/tests/ui/manual_async_fn.fixed index 27222cc0869..4f551690c43 100644 --- a/src/tools/clippy/tests/ui/manual_async_fn.fixed +++ b/src/tools/clippy/tests/ui/manual_async_fn.fixed @@ -43,10 +43,6 @@ impl S { 42 } - async fn meth_fut(&self) -> i32 { 42 } - - async fn empty_fut(&self) {} - // should be ignored fn not_fut(&self) -> i32 { 42 @@ -64,4 +60,40 @@ impl S { } } +// Tests related to lifetime capture + +async fn elided(_: &i32) -> i32 { 42 } + +// should be ignored +fn elided_not_bound(_: &i32) -> impl Future { + async { 42 } +} + +async fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> i32 { 42 } + +// should be ignored +#[allow(clippy::needless_lifetimes)] +fn explicit_not_bound<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future { + async { 42 } +} + +// should be ignored +mod issue_5765 { + use std::future::Future; + + struct A; + impl A { + fn f(&self) -> impl Future { + async {} + } + } + + fn test() { + let _future = { + let a = A; + a.f() + }; + } +} + fn main() {} diff --git a/src/tools/clippy/tests/ui/manual_async_fn.rs b/src/tools/clippy/tests/ui/manual_async_fn.rs index 6a0f1b26c88..6ed60309947 100644 --- a/src/tools/clippy/tests/ui/manual_async_fn.rs +++ b/src/tools/clippy/tests/ui/manual_async_fn.rs @@ -51,14 +51,6 @@ impl S { } } - fn meth_fut(&self) -> impl Future { - async { 42 } - } - - fn empty_fut(&self) -> impl Future { - async {} - } - // should be ignored fn not_fut(&self) -> i32 { 42 @@ -76,4 +68,44 @@ impl S { } } +// Tests related to lifetime capture + +fn elided(_: &i32) -> impl Future + '_ { + async { 42 } +} + +// should be ignored +fn elided_not_bound(_: &i32) -> impl Future { + async { 42 } +} + +fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future + 'a + 'b { + async { 42 } +} + +// should be ignored +#[allow(clippy::needless_lifetimes)] +fn explicit_not_bound<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future { + async { 42 } +} + +// should be ignored +mod issue_5765 { + use std::future::Future; + + struct A; + impl A { + fn f(&self) -> impl Future { + async {} + } + } + + fn test() { + let _future = { + let a = A; + a.f() + }; + } +} + fn main() {} diff --git a/src/tools/clippy/tests/ui/manual_async_fn.stderr b/src/tools/clippy/tests/ui/manual_async_fn.stderr index a1904c904d0..ccd82867427 100644 --- a/src/tools/clippy/tests/ui/manual_async_fn.stderr +++ b/src/tools/clippy/tests/ui/manual_async_fn.stderr @@ -65,34 +65,34 @@ LL | let c = 21; ... error: this function can be simplified using the `async fn` syntax - --> $DIR/manual_async_fn.rs:54:5 + --> $DIR/manual_async_fn.rs:73:1 | -LL | fn meth_fut(&self) -> impl Future { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | fn elided(_: &i32) -> impl Future + '_ { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | help: make the function `async` and return the output of the future directly | -LL | async fn meth_fut(&self) -> i32 { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | async fn elided(_: &i32) -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: move the body of the async block to the enclosing function | -LL | fn meth_fut(&self) -> impl Future { 42 } - | ^^^^^^ +LL | fn elided(_: &i32) -> impl Future + '_ { 42 } + | ^^^^^^ error: this function can be simplified using the `async fn` syntax - --> $DIR/manual_async_fn.rs:58:5 + --> $DIR/manual_async_fn.rs:82:1 | -LL | fn empty_fut(&self) -> impl Future { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future + 'a + 'b { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | -help: make the function `async` and remove the return type +help: make the function `async` and return the output of the future directly | -LL | async fn empty_fut(&self) { - | ^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | async fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> i32 { + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: move the body of the async block to the enclosing function | -LL | fn empty_fut(&self) -> impl Future {} - | ^^ +LL | fn explicit<'a, 'b>(_: &'a i32, _: &'b i32) -> impl Future + 'a + 'b { 42 } + | ^^^^^^ error: aborting due to 6 previous errors diff --git a/src/tools/clippy/tests/ui/map_flatten.fixed b/src/tools/clippy/tests/ui/map_flatten.fixed index 4171d80f48a..a5fdf7df613 100644 --- a/src/tools/clippy/tests/ui/map_flatten.fixed +++ b/src/tools/clippy/tests/ui/map_flatten.fixed @@ -5,6 +5,20 @@ #![allow(clippy::map_identity)] fn main() { + // mapping to Option on Iterator + fn option_id(x: i8) -> Option { + Some(x) + } + let option_id_ref: fn(i8) -> Option = option_id; + let option_id_closure = |x| Some(x); + let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id).collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_ref).collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_closure).collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(|x| x.checked_add(1)).collect(); + + // mapping to Iterator on Iterator let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect(); + + // mapping to Option on Option let _: Option<_> = (Some(Some(1))).and_then(|x| x); } diff --git a/src/tools/clippy/tests/ui/map_flatten.rs b/src/tools/clippy/tests/ui/map_flatten.rs index 16a0fd090ad..abbc4e16e56 100644 --- a/src/tools/clippy/tests/ui/map_flatten.rs +++ b/src/tools/clippy/tests/ui/map_flatten.rs @@ -5,6 +5,20 @@ #![allow(clippy::map_identity)] fn main() { + // mapping to Option on Iterator + fn option_id(x: i8) -> Option { + Some(x) + } + let option_id_ref: fn(i8) -> Option = option_id; + let option_id_closure = |x| Some(x); + let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id).flatten().collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_ref).flatten().collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_closure).flatten().collect(); + let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| x.checked_add(1)).flatten().collect(); + + // mapping to Iterator on Iterator let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); + + // mapping to Option on Option let _: Option<_> = (Some(Some(1))).map(|x| x).flatten(); } diff --git a/src/tools/clippy/tests/ui/map_flatten.stderr b/src/tools/clippy/tests/ui/map_flatten.stderr index 00bc41c15e9..b6479cd69ea 100644 --- a/src/tools/clippy/tests/ui/map_flatten.stderr +++ b/src/tools/clippy/tests/ui/map_flatten.stderr @@ -1,16 +1,40 @@ -error: called `map(..).flatten()` on an `Iterator`. This is more succinctly expressed by calling `.flat_map(..)` - --> $DIR/map_flatten.rs:8:21 +error: called `map(..).flatten()` on an `Iterator` + --> $DIR/map_flatten.rs:14:46 | -LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `flat_map` instead: `vec![5_i8; 6].into_iter().flat_map(|x| 0..x)` +LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id).flatten().collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `filter_map` instead: `.filter_map(option_id)` | = note: `-D clippy::map-flatten` implied by `-D warnings` -error: called `map(..).flatten()` on an `Option`. This is more succinctly expressed by calling `.and_then(..)` - --> $DIR/map_flatten.rs:9:24 +error: called `map(..).flatten()` on an `Iterator` + --> $DIR/map_flatten.rs:15:46 + | +LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_ref).flatten().collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `filter_map` instead: `.filter_map(option_id_ref)` + +error: called `map(..).flatten()` on an `Iterator` + --> $DIR/map_flatten.rs:16:46 + | +LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_closure).flatten().collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `filter_map` instead: `.filter_map(option_id_closure)` + +error: called `map(..).flatten()` on an `Iterator` + --> $DIR/map_flatten.rs:17:46 + | +LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| x.checked_add(1)).flatten().collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `filter_map` instead: `.filter_map(|x| x.checked_add(1))` + +error: called `map(..).flatten()` on an `Iterator` + --> $DIR/map_flatten.rs:20:46 + | +LL | let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect(); + | ^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `flat_map` instead: `.flat_map(|x| 0..x)` + +error: called `map(..).flatten()` on an `Option` + --> $DIR/map_flatten.rs:23:39 | LL | let _: Option<_> = (Some(Some(1))).map(|x| x).flatten(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try using `and_then` instead: `(Some(Some(1))).and_then(|x| x)` + | ^^^^^^^^^^^^^^^^^^^^^ help: try using `and_then` instead: `.and_then(|x| x)` -error: aborting due to 2 previous errors +error: aborting due to 6 previous errors diff --git a/src/tools/clippy/tests/ui/min_max.rs b/src/tools/clippy/tests/ui/min_max.rs index 8307d4b3019..f7ed72a11cf 100644 --- a/src/tools/clippy/tests/ui/min_max.rs +++ b/src/tools/clippy/tests/ui/min_max.rs @@ -6,6 +6,18 @@ use std::cmp::{max, min}; const LARGE: usize = 3; +struct NotOrd(u64); + +impl NotOrd { + fn min(self, x: u64) -> NotOrd { + NotOrd(x) + } + + fn max(self, x: u64) -> NotOrd { + NotOrd(x) + } +} + fn main() { let x; x = 2usize; @@ -30,4 +42,24 @@ fn main() { max(min(s, "Apple"), "Zoo"); max("Apple", min(s, "Zoo")); // ok + + let f = 3f32; + x.min(1).max(3); + x.max(3).min(1); + f.max(3f32).min(1f32); + + x.max(1).min(3); // ok + x.min(3).max(1); // ok + f.min(3f32).max(1f32); // ok + + max(x.min(1), 3); + min(x.max(1), 3); // ok + + s.max("Zoo").min("Apple"); + s.min("Apple").max("Zoo"); + + s.min("Zoo").max("Apple"); // ok + + let not_ord = NotOrd(1); + not_ord.min(1).max(3); // ok } diff --git a/src/tools/clippy/tests/ui/min_max.stderr b/src/tools/clippy/tests/ui/min_max.stderr index b552c137f7c..9f8e26fa406 100644 --- a/src/tools/clippy/tests/ui/min_max.stderr +++ b/src/tools/clippy/tests/ui/min_max.stderr @@ -1,5 +1,5 @@ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:12:5 + --> $DIR/min_max.rs:24:5 | LL | min(1, max(3, x)); | ^^^^^^^^^^^^^^^^^ @@ -7,40 +7,76 @@ LL | min(1, max(3, x)); = note: `-D clippy::min-max` implied by `-D warnings` error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:13:5 + --> $DIR/min_max.rs:25:5 | LL | min(max(3, x), 1); | ^^^^^^^^^^^^^^^^^ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:14:5 + --> $DIR/min_max.rs:26:5 | LL | max(min(x, 1), 3); | ^^^^^^^^^^^^^^^^^ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:15:5 + --> $DIR/min_max.rs:27:5 | LL | max(3, min(x, 1)); | ^^^^^^^^^^^^^^^^^ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:17:5 + --> $DIR/min_max.rs:29:5 | LL | my_max(3, my_min(x, 1)); | ^^^^^^^^^^^^^^^^^^^^^^^ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:29:5 + --> $DIR/min_max.rs:41:5 | LL | min("Apple", max("Zoo", s)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: this `min`/`max` combination leads to constant result - --> $DIR/min_max.rs:30:5 + --> $DIR/min_max.rs:42:5 | LL | max(min(s, "Apple"), "Zoo"); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: aborting due to 7 previous errors +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:47:5 + | +LL | x.min(1).max(3); + | ^^^^^^^^^^^^^^^ + +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:48:5 + | +LL | x.max(3).min(1); + | ^^^^^^^^^^^^^^^ + +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:49:5 + | +LL | f.max(3f32).min(1f32); + | ^^^^^^^^^^^^^^^^^^^^^ + +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:55:5 + | +LL | max(x.min(1), 3); + | ^^^^^^^^^^^^^^^^ + +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:58:5 + | +LL | s.max("Zoo").min("Apple"); + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: this `min`/`max` combination leads to constant result + --> $DIR/min_max.rs:59:5 + | +LL | s.min("Apple").max("Zoo"); + | ^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: aborting due to 13 previous errors diff --git a/src/tools/clippy/tests/ui/needless_arbitrary_self_type.fixed b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.fixed new file mode 100644 index 00000000000..9da21eb6b29 --- /dev/null +++ b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.fixed @@ -0,0 +1,69 @@ +// run-rustfix + +#![warn(clippy::needless_arbitrary_self_type)] +#![allow(unused_mut, clippy::needless_lifetimes)] + +pub enum ValType { + A, + B, +} + +impl ValType { + pub fn bad(self) { + unimplemented!(); + } + + pub fn good(self) { + unimplemented!(); + } + + pub fn mut_bad(mut self) { + unimplemented!(); + } + + pub fn mut_good(mut self) { + unimplemented!(); + } + + pub fn ref_bad(&self) { + unimplemented!(); + } + + pub fn ref_good(&self) { + unimplemented!(); + } + + pub fn ref_bad_with_lifetime<'a>(&'a self) { + unimplemented!(); + } + + pub fn ref_good_with_lifetime<'a>(&'a self) { + unimplemented!(); + } + + pub fn mut_ref_bad(&mut self) { + unimplemented!(); + } + + pub fn mut_ref_good(&mut self) { + unimplemented!(); + } + + pub fn mut_ref_bad_with_lifetime<'a>(&'a mut self) { + unimplemented!(); + } + + pub fn mut_ref_good_with_lifetime<'a>(&'a mut self) { + unimplemented!(); + } + + pub fn mut_ref_mut_good(mut self: &mut Self) { + unimplemented!(); + } + + pub fn mut_ref_mut_ref_good(self: &&mut &mut Self) { + unimplemented!(); + } +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/needless_arbitrary_self_type.rs b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.rs new file mode 100644 index 00000000000..17aeaaf97ac --- /dev/null +++ b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.rs @@ -0,0 +1,69 @@ +// run-rustfix + +#![warn(clippy::needless_arbitrary_self_type)] +#![allow(unused_mut, clippy::needless_lifetimes)] + +pub enum ValType { + A, + B, +} + +impl ValType { + pub fn bad(self: Self) { + unimplemented!(); + } + + pub fn good(self) { + unimplemented!(); + } + + pub fn mut_bad(mut self: Self) { + unimplemented!(); + } + + pub fn mut_good(mut self) { + unimplemented!(); + } + + pub fn ref_bad(self: &Self) { + unimplemented!(); + } + + pub fn ref_good(&self) { + unimplemented!(); + } + + pub fn ref_bad_with_lifetime<'a>(self: &'a Self) { + unimplemented!(); + } + + pub fn ref_good_with_lifetime<'a>(&'a self) { + unimplemented!(); + } + + pub fn mut_ref_bad(self: &mut Self) { + unimplemented!(); + } + + pub fn mut_ref_good(&mut self) { + unimplemented!(); + } + + pub fn mut_ref_bad_with_lifetime<'a>(self: &'a mut Self) { + unimplemented!(); + } + + pub fn mut_ref_good_with_lifetime<'a>(&'a mut self) { + unimplemented!(); + } + + pub fn mut_ref_mut_good(mut self: &mut Self) { + unimplemented!(); + } + + pub fn mut_ref_mut_ref_good(self: &&mut &mut Self) { + unimplemented!(); + } +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/needless_arbitrary_self_type.stderr b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.stderr new file mode 100644 index 00000000000..f4c645d35c8 --- /dev/null +++ b/src/tools/clippy/tests/ui/needless_arbitrary_self_type.stderr @@ -0,0 +1,40 @@ +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:12:16 + | +LL | pub fn bad(self: Self) { + | ^^^^^^^^^^ help: consider to change this parameter to: `self` + | + = note: `-D clippy::needless-arbitrary-self-type` implied by `-D warnings` + +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:20:20 + | +LL | pub fn mut_bad(mut self: Self) { + | ^^^^^^^^^^^^^^ help: consider to change this parameter to: `mut self` + +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:28:20 + | +LL | pub fn ref_bad(self: &Self) { + | ^^^^^^^^^^^ help: consider to change this parameter to: `&self` + +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:36:38 + | +LL | pub fn ref_bad_with_lifetime<'a>(self: &'a Self) { + | ^^^^^^^^^^^^^^ help: consider to change this parameter to: `&'a self` + +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:44:24 + | +LL | pub fn mut_ref_bad(self: &mut Self) { + | ^^^^^^^^^^^^^^^ help: consider to change this parameter to: `&mut self` + +error: the type of the `self` parameter does not need to be arbitrary + --> $DIR/needless_arbitrary_self_type.rs:52:42 + | +LL | pub fn mut_ref_bad_with_lifetime<'a>(self: &'a mut Self) { + | ^^^^^^^^^^^^^^^^^^ help: consider to change this parameter to: `&'a mut self` + +error: aborting due to 6 previous errors + diff --git a/src/tools/clippy/tests/ui/needless_collect.fixed b/src/tools/clippy/tests/ui/needless_collect.fixed index be37dc16b9a..7f2fcf02f6b 100644 --- a/src/tools/clippy/tests/ui/needless_collect.fixed +++ b/src/tools/clippy/tests/ui/needless_collect.fixed @@ -5,11 +5,11 @@ use std::collections::{BTreeSet, HashMap, HashSet}; #[warn(clippy::needless_collect)] -#[allow(unused_variables, clippy::iter_cloned_collect)] +#[allow(unused_variables, clippy::iter_cloned_collect, clippy::iter_next_slice)] fn main() { let sample = [1; 5]; let len = sample.iter().count(); - if sample.get(0).is_none() { + if sample.iter().next().is_none() { // Empty } sample.iter().cloned().any(|x| x == 1); diff --git a/src/tools/clippy/tests/ui/needless_collect.rs b/src/tools/clippy/tests/ui/needless_collect.rs index 7ee603afeb0..788a9eb3264 100644 --- a/src/tools/clippy/tests/ui/needless_collect.rs +++ b/src/tools/clippy/tests/ui/needless_collect.rs @@ -5,7 +5,7 @@ use std::collections::{BTreeSet, HashMap, HashSet}; #[warn(clippy::needless_collect)] -#[allow(unused_variables, clippy::iter_cloned_collect)] +#[allow(unused_variables, clippy::iter_cloned_collect, clippy::iter_next_slice)] fn main() { let sample = [1; 5]; let len = sample.iter().collect::>().len(); diff --git a/src/tools/clippy/tests/ui/needless_collect.stderr b/src/tools/clippy/tests/ui/needless_collect.stderr index 9113aad90dd..2a9539d5975 100644 --- a/src/tools/clippy/tests/ui/needless_collect.stderr +++ b/src/tools/clippy/tests/ui/needless_collect.stderr @@ -7,10 +7,10 @@ LL | let len = sample.iter().collect::>().len(); = note: `-D clippy::needless-collect` implied by `-D warnings` error: avoid using `collect()` when not needed - --> $DIR/needless_collect.rs:12:15 + --> $DIR/needless_collect.rs:12:22 | LL | if sample.iter().collect::>().is_empty() { - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `get(0).is_none()` + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `next().is_none()` error: avoid using `collect()` when not needed --> $DIR/needless_collect.rs:15:28 diff --git a/src/tools/clippy/tests/ui/needless_collect_indirect.rs b/src/tools/clippy/tests/ui/needless_collect_indirect.rs new file mode 100644 index 00000000000..4cf03e82035 --- /dev/null +++ b/src/tools/clippy/tests/ui/needless_collect_indirect.rs @@ -0,0 +1,19 @@ +use std::collections::{HashMap, VecDeque}; + +fn main() { + let sample = [1; 5]; + let indirect_iter = sample.iter().collect::>(); + indirect_iter.into_iter().map(|x| (x, x + 1)).collect::>(); + let indirect_len = sample.iter().collect::>(); + indirect_len.len(); + let indirect_empty = sample.iter().collect::>(); + indirect_empty.is_empty(); + let indirect_contains = sample.iter().collect::>(); + indirect_contains.contains(&&5); + let indirect_negative = sample.iter().collect::>(); + indirect_negative.len(); + indirect_negative + .into_iter() + .map(|x| (*x, *x + 1)) + .collect::>(); +} diff --git a/src/tools/clippy/tests/ui/needless_collect_indirect.stderr b/src/tools/clippy/tests/ui/needless_collect_indirect.stderr new file mode 100644 index 00000000000..0c1e61d7496 --- /dev/null +++ b/src/tools/clippy/tests/ui/needless_collect_indirect.stderr @@ -0,0 +1,55 @@ +error: avoid using `collect()` when not needed + --> $DIR/needless_collect_indirect.rs:5:5 + | +LL | / let indirect_iter = sample.iter().collect::>(); +LL | | indirect_iter.into_iter().map(|x| (x, x + 1)).collect::>(); + | |____^ + | + = note: `-D clippy::needless-collect` implied by `-D warnings` +help: Use the original Iterator instead of collecting it and then producing a new one + | +LL | +LL | sample.iter().map(|x| (x, x + 1)).collect::>(); + | + +error: avoid using `collect()` when not needed + --> $DIR/needless_collect_indirect.rs:7:5 + | +LL | / let indirect_len = sample.iter().collect::>(); +LL | | indirect_len.len(); + | |____^ + | +help: Take the original Iterator's count instead of collecting it and finding the length + | +LL | +LL | sample.iter().count(); + | + +error: avoid using `collect()` when not needed + --> $DIR/needless_collect_indirect.rs:9:5 + | +LL | / let indirect_empty = sample.iter().collect::>(); +LL | | indirect_empty.is_empty(); + | |____^ + | +help: Check if the original Iterator has anything instead of collecting it and seeing if it's empty + | +LL | +LL | sample.iter().next().is_none(); + | + +error: avoid using `collect()` when not needed + --> $DIR/needless_collect_indirect.rs:11:5 + | +LL | / let indirect_contains = sample.iter().collect::>(); +LL | | indirect_contains.contains(&&5); + | |____^ + | +help: Check if the original Iterator contains an element instead of collecting then checking + | +LL | +LL | sample.iter().any(|x| x == &&5); + | + +error: aborting due to 4 previous errors + diff --git a/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.stderr b/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.stderr index 8c5d548222e..c7856000721 100644 --- a/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.stderr +++ b/src/tools/clippy/tests/ui/neg_cmp_op_on_partial_ord.stderr @@ -1,4 +1,4 @@ -error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable. +error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor, please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable --> $DIR/neg_cmp_op_on_partial_ord.rs:16:21 | LL | let _not_less = !(a_value < another_value); @@ -6,19 +6,19 @@ LL | let _not_less = !(a_value < another_value); | = note: `-D clippy::neg-cmp-op-on-partial-ord` implied by `-D warnings` -error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable. +error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor, please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable --> $DIR/neg_cmp_op_on_partial_ord.rs:19:30 | LL | let _not_less_or_equal = !(a_value <= another_value); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable. +error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor, please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable --> $DIR/neg_cmp_op_on_partial_ord.rs:22:24 | LL | let _not_greater = !(a_value > another_value); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: The use of negated comparison operators on partially ordered types produces code that is hard to read and refactor. Please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable. +error: the use of negated comparison operators on partially ordered types produces code that is hard to read and refactor, please consider using the `partial_cmp` method instead, to make it clear that the two values could be incomparable --> $DIR/neg_cmp_op_on_partial_ord.rs:25:33 | LL | let _not_greater_or_equal = !(a_value >= another_value); diff --git a/src/tools/clippy/tests/ui/neg_multiply.stderr b/src/tools/clippy/tests/ui/neg_multiply.stderr index f08bbd6a12c..ad677f6d6fb 100644 --- a/src/tools/clippy/tests/ui/neg_multiply.stderr +++ b/src/tools/clippy/tests/ui/neg_multiply.stderr @@ -1,4 +1,4 @@ -error: Negation by multiplying with `-1` +error: negation by multiplying with `-1` --> $DIR/neg_multiply.rs:27:5 | LL | x * -1; @@ -6,7 +6,7 @@ LL | x * -1; | = note: `-D clippy::neg-multiply` implied by `-D warnings` -error: Negation by multiplying with `-1` +error: negation by multiplying with `-1` --> $DIR/neg_multiply.rs:29:5 | LL | -1 * x; diff --git a/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.fixed b/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.fixed index 9a0da404cb6..96d1c54946c 100644 --- a/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.fixed +++ b/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.fixed @@ -22,9 +22,9 @@ struct HasOption { } impl HasOption { - fn do_option_nothing(self: &Self, value: usize) {} + fn do_option_nothing(&self, value: usize) {} - fn do_option_plus_one(self: &Self, value: usize) -> usize { + fn do_option_plus_one(&self, value: usize) -> usize { value + 1 } } diff --git a/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.rs b/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.rs index 58041b62df3..931ffc18665 100644 --- a/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.rs +++ b/src/tools/clippy/tests/ui/option_map_unit_fn_fixable.rs @@ -22,9 +22,9 @@ struct HasOption { } impl HasOption { - fn do_option_nothing(self: &Self, value: usize) {} + fn do_option_nothing(&self, value: usize) {} - fn do_option_plus_one(self: &Self, value: usize) -> usize { + fn do_option_plus_one(&self, value: usize) -> usize { value + 1 } } diff --git a/src/tools/clippy/tests/ui/or_fun_call.fixed b/src/tools/clippy/tests/ui/or_fun_call.fixed index 2045ffdb5f0..67faa8bd4a0 100644 --- a/src/tools/clippy/tests/ui/or_fun_call.fixed +++ b/src/tools/clippy/tests/ui/or_fun_call.fixed @@ -116,4 +116,12 @@ fn f() -> Option<()> { Some(()) } +// Issue 5886 - const fn (with no arguments) +pub fn skip_const_fn_with_no_args() { + const fn foo() -> Option { + Some(42) + } + let _ = None.or(foo()); +} + fn main() {} diff --git a/src/tools/clippy/tests/ui/or_fun_call.rs b/src/tools/clippy/tests/ui/or_fun_call.rs index 522f31b72d0..9867e2eedcf 100644 --- a/src/tools/clippy/tests/ui/or_fun_call.rs +++ b/src/tools/clippy/tests/ui/or_fun_call.rs @@ -116,4 +116,12 @@ fn f() -> Option<()> { Some(()) } +// Issue 5886 - const fn (with no arguments) +pub fn skip_const_fn_with_no_args() { + const fn foo() -> Option { + Some(42) + } + let _ = None.or(foo()); +} + fn main() {} diff --git a/src/tools/clippy/tests/ui/overflow_check_conditional.stderr b/src/tools/clippy/tests/ui/overflow_check_conditional.stderr index ad66135d326..19e843c2c0a 100644 --- a/src/tools/clippy/tests/ui/overflow_check_conditional.stderr +++ b/src/tools/clippy/tests/ui/overflow_check_conditional.stderr @@ -1,4 +1,4 @@ -error: You are trying to use classic C overflow conditions that will fail in Rust. +error: you are trying to use classic C overflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:8:8 | LL | if a + b < a {} @@ -6,43 +6,43 @@ LL | if a + b < a {} | = note: `-D clippy::overflow-check-conditional` implied by `-D warnings` -error: You are trying to use classic C overflow conditions that will fail in Rust. +error: you are trying to use classic C overflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:9:8 | LL | if a > a + b {} | ^^^^^^^^^ -error: You are trying to use classic C overflow conditions that will fail in Rust. +error: you are trying to use classic C overflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:10:8 | LL | if a + b < b {} | ^^^^^^^^^ -error: You are trying to use classic C overflow conditions that will fail in Rust. +error: you are trying to use classic C overflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:11:8 | LL | if b > a + b {} | ^^^^^^^^^ -error: You are trying to use classic C underflow conditions that will fail in Rust. +error: you are trying to use classic C underflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:12:8 | LL | if a - b > b {} | ^^^^^^^^^ -error: You are trying to use classic C underflow conditions that will fail in Rust. +error: you are trying to use classic C underflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:13:8 | LL | if b < a - b {} | ^^^^^^^^^ -error: You are trying to use classic C underflow conditions that will fail in Rust. +error: you are trying to use classic C underflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:14:8 | LL | if a - b > a {} | ^^^^^^^^^ -error: You are trying to use classic C underflow conditions that will fail in Rust. +error: you are trying to use classic C underflow conditions that will fail in Rust --> $DIR/overflow_check_conditional.rs:15:8 | LL | if a < a - b {} diff --git a/src/tools/clippy/tests/ui/path_buf_push_overwrite.stderr b/src/tools/clippy/tests/ui/path_buf_push_overwrite.stderr index 09b18d71baf..bb8dce2bbba 100644 --- a/src/tools/clippy/tests/ui/path_buf_push_overwrite.stderr +++ b/src/tools/clippy/tests/ui/path_buf_push_overwrite.stderr @@ -1,4 +1,4 @@ -error: Calling `push` with '/' or '/' (file system root) will overwrite the previous path definition +error: calling `push` with '/' or '/' (file system root) will overwrite the previous path definition --> $DIR/path_buf_push_overwrite.rs:7:12 | LL | x.push("/bar"); diff --git a/src/tools/clippy/tests/ui/range.stderr b/src/tools/clippy/tests/ui/range.stderr index d53c1edecac..dcb5061371f 100644 --- a/src/tools/clippy/tests/ui/range.stderr +++ b/src/tools/clippy/tests/ui/range.stderr @@ -1,4 +1,4 @@ -error: It is more idiomatic to use `v1.iter().enumerate()` +error: it is more idiomatic to use `v1.iter().enumerate()` --> $DIR/range.rs:5:14 | LL | let _x = v1.iter().zip(0..v1.len()); diff --git a/src/tools/clippy/tests/ui/redundant_static_lifetimes.stderr b/src/tools/clippy/tests/ui/redundant_static_lifetimes.stderr index 3c3d2eacd8d..649831f9c06 100644 --- a/src/tools/clippy/tests/ui/redundant_static_lifetimes.stderr +++ b/src/tools/clippy/tests/ui/redundant_static_lifetimes.stderr @@ -1,4 +1,4 @@ -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:8:17 | LL | const VAR_ONE: &'static str = "Test constant #1"; // ERROR Consider removing 'static. @@ -6,91 +6,91 @@ LL | const VAR_ONE: &'static str = "Test constant #1"; // ERROR Consider removin | = note: `-D clippy::redundant-static-lifetimes` implied by `-D warnings` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:12:21 | LL | const VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:14:32 | LL | const VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:14:47 | LL | const VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:16:17 | LL | const VAR_SIX: &'static u8 = &5; | -^^^^^^^--- help: consider removing `'static`: `&u8` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:18:20 | LL | const VAR_HEIGHT: &'static Foo = &Foo {}; | -^^^^^^^---- help: consider removing `'static`: `&Foo` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:20:19 | LL | const VAR_SLICE: &'static [u8] = b"Test constant #1"; // ERROR Consider removing 'static. | -^^^^^^^----- help: consider removing `'static`: `&[u8]` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:22:19 | LL | const VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static. | -^^^^^^^--------- help: consider removing `'static`: `&(u8, u8)` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:24:19 | LL | const VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static. | -^^^^^^^-------- help: consider removing `'static`: `&[u8; 1]` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:26:25 | LL | static STATIC_VAR_ONE: &'static str = "Test static #1"; // ERROR Consider removing 'static. | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:30:29 | LL | static STATIC_VAR_THREE: &[&'static str] = &["one", "two"]; // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:32:25 | LL | static STATIC_VAR_SIX: &'static u8 = &5; | -^^^^^^^--- help: consider removing `'static`: `&u8` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:34:28 | LL | static STATIC_VAR_HEIGHT: &'static Foo = &Foo {}; | -^^^^^^^---- help: consider removing `'static`: `&Foo` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:36:27 | LL | static STATIC_VAR_SLICE: &'static [u8] = b"Test static #3"; // ERROR Consider removing 'static. | -^^^^^^^----- help: consider removing `'static`: `&[u8]` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:38:27 | LL | static STATIC_VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing 'static. | -^^^^^^^--------- help: consider removing `'static`: `&(u8, u8)` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes.rs:40:27 | LL | static STATIC_VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static. diff --git a/src/tools/clippy/tests/ui/redundant_static_lifetimes_multiple.stderr b/src/tools/clippy/tests/ui/redundant_static_lifetimes_multiple.stderr index afc853dcfce..cc7e55a757a 100644 --- a/src/tools/clippy/tests/ui/redundant_static_lifetimes_multiple.stderr +++ b/src/tools/clippy/tests/ui/redundant_static_lifetimes_multiple.stderr @@ -1,4 +1,4 @@ -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:3:18 | LL | const VAR_FIVE: &'static [&[&'static str]] = &[&["test"], &["other one"]]; // ERROR Consider removing 'static @@ -6,55 +6,55 @@ LL | const VAR_FIVE: &'static [&[&'static str]] = &[&["test"], &["other one"]]; | = note: `-D clippy::redundant-static-lifetimes` implied by `-D warnings` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:3:30 | LL | const VAR_FIVE: &'static [&[&'static str]] = &[&["test"], &["other one"]]; // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:5:29 | LL | const VAR_SEVEN: &[&(&str, &'static [&'static str])] = &[&("one", &["other one"])]; | -^^^^^^^--------------- help: consider removing `'static`: `&[&'static str]` -error: Constants have by default a `'static` lifetime +error: constants have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:5:39 | LL | const VAR_SEVEN: &[&(&str, &'static [&'static str])] = &[&("one", &["other one"])]; | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:7:40 | LL | static STATIC_VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:7:55 | LL | static STATIC_VAR_FOUR: (&str, (&str, &'static str), &'static str) = ("on", ("th", "th"), "on"); // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:9:26 | LL | static STATIC_VAR_FIVE: &'static [&[&'static str]] = &[&["test"], &["other one"]]; // ERROR Consider removing 'static | -^^^^^^^------------------ help: consider removing `'static`: `&[&[&'static str]]` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:9:38 | LL | static STATIC_VAR_FIVE: &'static [&[&'static str]] = &[&["test"], &["other one"]]; // ERROR Consider removing 'static | -^^^^^^^---- help: consider removing `'static`: `&str` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:11:37 | LL | static STATIC_VAR_SEVEN: &[&(&str, &'static [&'static str])] = &[&("one", &["other one"])]; | -^^^^^^^--------------- help: consider removing `'static`: `&[&'static str]` -error: Statics have by default a `'static` lifetime +error: statics have by default a `'static` lifetime --> $DIR/redundant_static_lifetimes_multiple.rs:11:47 | LL | static STATIC_VAR_SEVEN: &[&(&str, &'static [&'static str])] = &[&("one", &["other one"])]; diff --git a/src/tools/clippy/tests/ui/renamed_builtin_attr.stderr b/src/tools/clippy/tests/ui/renamed_builtin_attr.stderr index a399ff52fb8..88046762483 100644 --- a/src/tools/clippy/tests/ui/renamed_builtin_attr.stderr +++ b/src/tools/clippy/tests/ui/renamed_builtin_attr.stderr @@ -1,4 +1,4 @@ -error: Usage of deprecated attribute +error: usage of deprecated attribute --> $DIR/renamed_builtin_attr.rs:3:11 | LL | #[clippy::cyclomatic_complexity = "1"] diff --git a/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.fixed b/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.fixed index 1d0a3ecd0ff..631042c616b 100644 --- a/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.fixed +++ b/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.fixed @@ -18,9 +18,9 @@ struct HasResult { } impl HasResult { - fn do_result_nothing(self: &Self, value: usize) {} + fn do_result_nothing(&self, value: usize) {} - fn do_result_plus_one(self: &Self, value: usize) -> usize { + fn do_result_plus_one(&self, value: usize) -> usize { value + 1 } } diff --git a/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.rs b/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.rs index 2fe18f923f0..679eb232626 100644 --- a/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.rs +++ b/src/tools/clippy/tests/ui/result_map_unit_fn_fixable.rs @@ -18,9 +18,9 @@ struct HasResult { } impl HasResult { - fn do_result_nothing(self: &Self, value: usize) {} + fn do_result_nothing(&self, value: usize) {} - fn do_result_plus_one(self: &Self, value: usize) -> usize { + fn do_result_plus_one(&self, value: usize) -> usize { value + 1 } } diff --git a/src/tools/clippy/tests/ui/same_item_push.rs b/src/tools/clippy/tests/ui/same_item_push.rs new file mode 100644 index 00000000000..ff1088f86f6 --- /dev/null +++ b/src/tools/clippy/tests/ui/same_item_push.rs @@ -0,0 +1,89 @@ +#![warn(clippy::same_item_push)] + +fn mutate_increment(x: &mut u8) -> u8 { + *x += 1; + *x +} + +fn increment(x: u8) -> u8 { + x + 1 +} + +fn main() { + // Test for basic case + let mut spaces = Vec::with_capacity(10); + for _ in 0..10 { + spaces.push(vec![b' ']); + } + + let mut vec2: Vec = Vec::new(); + let item = 2; + for _ in 5..=20 { + vec2.push(item); + } + + let mut vec3: Vec = Vec::new(); + for _ in 0..15 { + let item = 2; + vec3.push(item); + } + + let mut vec4: Vec = Vec::new(); + for _ in 0..15 { + vec4.push(13); + } + + // Suggestion should not be given as pushed variable can mutate + let mut vec5: Vec = Vec::new(); + let mut item: u8 = 2; + for _ in 0..30 { + vec5.push(mutate_increment(&mut item)); + } + + let mut vec6: Vec = Vec::new(); + let mut item: u8 = 2; + let mut item2 = &mut mutate_increment(&mut item); + for _ in 0..30 { + vec6.push(mutate_increment(item2)); + } + + let mut vec7: Vec = Vec::new(); + for (a, b) in [0, 1, 4, 9, 16].iter().enumerate() { + vec7.push(a); + } + + let mut vec8: Vec = Vec::new(); + for i in 0..30 { + vec8.push(increment(i)); + } + + let mut vec9: Vec = Vec::new(); + for i in 0..30 { + vec9.push(i + i * i); + } + + // Suggestion should not be given as there are multiple pushes that are not the same + let mut vec10: Vec = Vec::new(); + let item: u8 = 2; + for _ in 0..30 { + vec10.push(item); + vec10.push(item * 2); + } + + // Suggestion should not be given as Vec is not involved + for _ in 0..5 { + println!("Same Item Push"); + } + + struct A { + kind: u32, + } + let mut vec_a: Vec = Vec::new(); + for i in 0..30 { + vec_a.push(A { kind: i }); + } + let mut vec12: Vec = Vec::new(); + for a in vec_a { + vec12.push(2u8.pow(a.kind)); + } +} diff --git a/src/tools/clippy/tests/ui/same_item_push.stderr b/src/tools/clippy/tests/ui/same_item_push.stderr new file mode 100644 index 00000000000..ddc5d48cd41 --- /dev/null +++ b/src/tools/clippy/tests/ui/same_item_push.stderr @@ -0,0 +1,35 @@ +error: it looks like the same item is being pushed into this Vec + --> $DIR/same_item_push.rs:16:9 + | +LL | spaces.push(vec![b' ']); + | ^^^^^^ + | + = note: `-D clippy::same-item-push` implied by `-D warnings` + = help: try using vec![vec![b' '];SIZE] or spaces.resize(NEW_SIZE, vec![b' ']) + +error: it looks like the same item is being pushed into this Vec + --> $DIR/same_item_push.rs:22:9 + | +LL | vec2.push(item); + | ^^^^ + | + = help: try using vec![item;SIZE] or vec2.resize(NEW_SIZE, item) + +error: it looks like the same item is being pushed into this Vec + --> $DIR/same_item_push.rs:28:9 + | +LL | vec3.push(item); + | ^^^^ + | + = help: try using vec![item;SIZE] or vec3.resize(NEW_SIZE, item) + +error: it looks like the same item is being pushed into this Vec + --> $DIR/same_item_push.rs:33:9 + | +LL | vec4.push(13); + | ^^^^ + | + = help: try using vec![13;SIZE] or vec4.resize(NEW_SIZE, 13) + +error: aborting due to 4 previous errors + diff --git a/src/tools/clippy/tests/ui/stable_sort_primitive.fixed b/src/tools/clippy/tests/ui/stable_sort_primitive.fixed new file mode 100644 index 00000000000..8f8f5665931 --- /dev/null +++ b/src/tools/clippy/tests/ui/stable_sort_primitive.fixed @@ -0,0 +1,32 @@ +// run-rustfix +#![warn(clippy::stable_sort_primitive)] + +fn main() { + // positive examples + let mut vec = vec![1, 3, 2]; + vec.sort_unstable(); + let mut vec = vec![false, false, true]; + vec.sort_unstable(); + let mut vec = vec!['a', 'A', 'c']; + vec.sort_unstable(); + let mut vec = vec!["ab", "cd", "ab", "bc"]; + vec.sort_unstable(); + let mut vec = vec![(2, 1), (1, 2), (2, 5)]; + vec.sort_unstable(); + let mut vec = vec![[2, 1], [1, 2], [2, 5]]; + vec.sort_unstable(); + let mut arr = [1, 3, 2]; + arr.sort_unstable(); + // Negative examples: behavior changes if made unstable + let mut vec = vec![1, 3, 2]; + vec.sort_by_key(|i| i / 2); + vec.sort_by(|a, b| (a + b).cmp(&b)); + // negative examples - Not of a primitive type + let mut vec_of_complex = vec![String::from("hello"), String::from("world!")]; + vec_of_complex.sort(); + vec_of_complex.sort_by_key(String::len); + let mut vec = vec![(String::from("hello"), String::from("world"))]; + vec.sort(); + let mut vec = vec![[String::from("hello"), String::from("world")]]; + vec.sort(); +} diff --git a/src/tools/clippy/tests/ui/stable_sort_primitive.rs b/src/tools/clippy/tests/ui/stable_sort_primitive.rs new file mode 100644 index 00000000000..f9bd9779067 --- /dev/null +++ b/src/tools/clippy/tests/ui/stable_sort_primitive.rs @@ -0,0 +1,32 @@ +// run-rustfix +#![warn(clippy::stable_sort_primitive)] + +fn main() { + // positive examples + let mut vec = vec![1, 3, 2]; + vec.sort(); + let mut vec = vec![false, false, true]; + vec.sort(); + let mut vec = vec!['a', 'A', 'c']; + vec.sort(); + let mut vec = vec!["ab", "cd", "ab", "bc"]; + vec.sort(); + let mut vec = vec![(2, 1), (1, 2), (2, 5)]; + vec.sort(); + let mut vec = vec![[2, 1], [1, 2], [2, 5]]; + vec.sort(); + let mut arr = [1, 3, 2]; + arr.sort(); + // Negative examples: behavior changes if made unstable + let mut vec = vec![1, 3, 2]; + vec.sort_by_key(|i| i / 2); + vec.sort_by(|a, b| (a + b).cmp(&b)); + // negative examples - Not of a primitive type + let mut vec_of_complex = vec![String::from("hello"), String::from("world!")]; + vec_of_complex.sort(); + vec_of_complex.sort_by_key(String::len); + let mut vec = vec![(String::from("hello"), String::from("world"))]; + vec.sort(); + let mut vec = vec![[String::from("hello"), String::from("world")]]; + vec.sort(); +} diff --git a/src/tools/clippy/tests/ui/stable_sort_primitive.stderr b/src/tools/clippy/tests/ui/stable_sort_primitive.stderr new file mode 100644 index 00000000000..b0b729ede48 --- /dev/null +++ b/src/tools/clippy/tests/ui/stable_sort_primitive.stderr @@ -0,0 +1,46 @@ +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:7:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + | + = note: `-D clippy::stable-sort-primitive` implied by `-D warnings` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:9:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:11:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:13:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:15:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:17:5 + | +LL | vec.sort(); + | ^^^^^^^^^^ help: try: `vec.sort_unstable()` + +error: Use sort_unstable instead of sort + --> $DIR/stable_sort_primitive.rs:19:5 + | +LL | arr.sort(); + | ^^^^^^^^^^ help: try: `arr.sort_unstable()` + +error: aborting due to 7 previous errors + diff --git a/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.rs b/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.rs index 1f5b9811887..60c2f3ec9b6 100644 --- a/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.rs +++ b/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.rs @@ -88,3 +88,33 @@ fn main() {} fn do_nothing(x: u32) -> u32 { x } + +struct MultipleBinops(u32); + +impl Add for MultipleBinops { + type Output = MultipleBinops; + + // OK: multiple Binops in `add` impl + fn add(self, other: Self) -> Self::Output { + let mut result = self.0 + other.0; + if result >= u32::max_value() { + result -= u32::max_value(); + } + MultipleBinops(result) + } +} + +impl Mul for MultipleBinops { + type Output = MultipleBinops; + + // OK: multiple Binops in `mul` impl + fn mul(self, other: Self) -> Self::Output { + let mut result: u32 = 0; + let size = std::cmp::max(self.0, other.0) as usize; + let mut v = vec![0; size + 1]; + for i in 0..size + 1 { + result *= i as u32; + } + MultipleBinops(result) + } +} diff --git a/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.stderr b/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.stderr index 7e42d72c30b..23d47e3f1ff 100644 --- a/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.stderr +++ b/src/tools/clippy/tests/ui/suspicious_arithmetic_impl.stderr @@ -1,4 +1,4 @@ -error: Suspicious use of binary operator in `Add` impl +error: suspicious use of binary operator in `Add` impl --> $DIR/suspicious_arithmetic_impl.rs:11:20 | LL | Foo(self.0 - other.0) @@ -6,7 +6,7 @@ LL | Foo(self.0 - other.0) | = note: `-D clippy::suspicious-arithmetic-impl` implied by `-D warnings` -error: Suspicious use of binary operator in `AddAssign` impl +error: suspicious use of binary operator in `AddAssign` impl --> $DIR/suspicious_arithmetic_impl.rs:17:23 | LL | *self = *self - other; @@ -14,7 +14,7 @@ LL | *self = *self - other; | = note: `#[deny(clippy::suspicious_op_assign_impl)]` on by default -error: Suspicious use of binary operator in `MulAssign` impl +error: suspicious use of binary operator in `MulAssign` impl --> $DIR/suspicious_arithmetic_impl.rs:30:16 | LL | self.0 /= other.0; diff --git a/src/tools/clippy/tests/ui/trait_duplication_in_bounds.rs b/src/tools/clippy/tests/ui/trait_duplication_in_bounds.rs new file mode 100644 index 00000000000..cb2b0054e35 --- /dev/null +++ b/src/tools/clippy/tests/ui/trait_duplication_in_bounds.rs @@ -0,0 +1,31 @@ +#![deny(clippy::trait_duplication_in_bounds)] + +use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign}; + +fn bad_foo(arg0: T, arg1: Z) +where + T: Clone, + T: Default, +{ + unimplemented!(); +} + +fn good_bar(arg: T) { + unimplemented!(); +} + +fn good_foo(arg: T) +where + T: Clone + Default, +{ + unimplemented!(); +} + +fn good_foobar(arg: T) +where + T: Clone, +{ + unimplemented!(); +} + +fn main() {} diff --git a/src/tools/clippy/tests/ui/trait_duplication_in_bounds.stderr b/src/tools/clippy/tests/ui/trait_duplication_in_bounds.stderr new file mode 100644 index 00000000000..027e1c75204 --- /dev/null +++ b/src/tools/clippy/tests/ui/trait_duplication_in_bounds.stderr @@ -0,0 +1,23 @@ +error: this trait bound is already specified in the where clause + --> $DIR/trait_duplication_in_bounds.rs:5:15 + | +LL | fn bad_foo(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:5:23 + | +LL | fn bad_foo(arg0: T, arg1: Z) + | ^^^^^^^ + | + = help: consider removing this trait bound + +error: aborting due to 2 previous errors + diff --git a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.fixed b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.fixed index 98288dde6d8..b6f1e83181c 100644 --- a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.fixed +++ b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.fixed @@ -9,60 +9,48 @@ use std::mem::{size_of, transmute}; -// rustc_typeck::check::cast contains documentation about when a cast `e as U` is +// rustc_typeck::check::cast contains documentation about when a cast `e as U` is // valid, which we quote from below. fn main() { // We should see an error message for each transmute, and no error messages for // the casts, since the casts are the recommended fixes. // e is an integer and U is *U_0, while U_0: Sized; addr-ptr-cast - let _ptr_i32_transmute = unsafe { - usize::MAX as *const i32 - }; + let _ptr_i32_transmute = unsafe { usize::MAX as *const i32 }; let ptr_i32 = usize::MAX as *const i32; // e has type *T, U is *U_0, and either U_0: Sized ... - let _ptr_i8_transmute = unsafe { - ptr_i32 as *const i8 - }; + let _ptr_i8_transmute = unsafe { ptr_i32 as *const i8 }; let _ptr_i8 = ptr_i32 as *const i8; - let slice_ptr = &[0,1,2,3] as *const [i32]; + let slice_ptr = &[0, 1, 2, 3] as *const [i32]; // ... or pointer_kind(T) = pointer_kind(U_0); ptr-ptr-cast - let _ptr_to_unsized_transmute = unsafe { - slice_ptr as *const [u16] - }; + let _ptr_to_unsized_transmute = unsafe { slice_ptr as *const [u16] }; let _ptr_to_unsized = slice_ptr as *const [u16]; // TODO: We could try testing vtable casts here too, but maybe // we should wait until std::raw::TraitObject is stabilized? // e has type *T and U is a numeric type, while T: Sized; ptr-addr-cast - let _usize_from_int_ptr_transmute = unsafe { - ptr_i32 as usize - }; + let _usize_from_int_ptr_transmute = unsafe { ptr_i32 as usize }; let _usize_from_int_ptr = ptr_i32 as usize; - let array_ref: &[i32; 4] = &[1,2,3,4]; + let array_ref: &[i32; 4] = &[1, 2, 3, 4]; // e has type &[T; n] and U is *const T; array-ptr-cast - let _array_ptr_transmute = unsafe { - array_ref as *const [i32; 4] - }; + let _array_ptr_transmute = unsafe { array_ref as *const [i32; 4] }; let _array_ptr = array_ref as *const [i32; 4]; - fn foo(_: usize) -> u8 { 42 } + fn foo(_: usize) -> u8 { + 42 + } // e is a function pointer type and U has type *T, while T: Sized; fptr-ptr-cast - let _usize_ptr_transmute = unsafe { - foo as *const usize - }; + let _usize_ptr_transmute = unsafe { foo as *const usize }; let _usize_ptr_transmute = foo as *const usize; // e is a function pointer type and U is an integer; fptr-addr-cast - let _usize_from_fn_ptr_transmute = unsafe { - foo as usize - }; + let _usize_from_fn_ptr_transmute = unsafe { foo as usize }; let _usize_from_fn_ptr = foo as *const usize; } diff --git a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.rs b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.rs index fd5055c08f6..0205d1ece60 100644 --- a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.rs +++ b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.rs @@ -9,60 +9,48 @@ use std::mem::{size_of, transmute}; -// rustc_typeck::check::cast contains documentation about when a cast `e as U` is +// rustc_typeck::check::cast contains documentation about when a cast `e as U` is // valid, which we quote from below. fn main() { // We should see an error message for each transmute, and no error messages for // the casts, since the casts are the recommended fixes. // e is an integer and U is *U_0, while U_0: Sized; addr-ptr-cast - let _ptr_i32_transmute = unsafe { - transmute::(usize::MAX) - }; + let _ptr_i32_transmute = unsafe { transmute::(usize::MAX) }; let ptr_i32 = usize::MAX as *const i32; // e has type *T, U is *U_0, and either U_0: Sized ... - let _ptr_i8_transmute = unsafe { - transmute::<*const i32, *const i8>(ptr_i32) - }; + let _ptr_i8_transmute = unsafe { transmute::<*const i32, *const i8>(ptr_i32) }; let _ptr_i8 = ptr_i32 as *const i8; - let slice_ptr = &[0,1,2,3] as *const [i32]; + let slice_ptr = &[0, 1, 2, 3] as *const [i32]; // ... or pointer_kind(T) = pointer_kind(U_0); ptr-ptr-cast - let _ptr_to_unsized_transmute = unsafe { - transmute::<*const [i32], *const [u16]>(slice_ptr) - }; + let _ptr_to_unsized_transmute = unsafe { transmute::<*const [i32], *const [u16]>(slice_ptr) }; let _ptr_to_unsized = slice_ptr as *const [u16]; // TODO: We could try testing vtable casts here too, but maybe // we should wait until std::raw::TraitObject is stabilized? // e has type *T and U is a numeric type, while T: Sized; ptr-addr-cast - let _usize_from_int_ptr_transmute = unsafe { - transmute::<*const i32, usize>(ptr_i32) - }; + let _usize_from_int_ptr_transmute = unsafe { transmute::<*const i32, usize>(ptr_i32) }; let _usize_from_int_ptr = ptr_i32 as usize; - let array_ref: &[i32; 4] = &[1,2,3,4]; + let array_ref: &[i32; 4] = &[1, 2, 3, 4]; // e has type &[T; n] and U is *const T; array-ptr-cast - let _array_ptr_transmute = unsafe { - transmute::<&[i32; 4], *const [i32; 4]>(array_ref) - }; + let _array_ptr_transmute = unsafe { transmute::<&[i32; 4], *const [i32; 4]>(array_ref) }; let _array_ptr = array_ref as *const [i32; 4]; - fn foo(_: usize) -> u8 { 42 } + fn foo(_: usize) -> u8 { + 42 + } // e is a function pointer type and U has type *T, while T: Sized; fptr-ptr-cast - let _usize_ptr_transmute = unsafe { - transmute:: u8, *const usize>(foo) - }; + let _usize_ptr_transmute = unsafe { transmute:: u8, *const usize>(foo) }; let _usize_ptr_transmute = foo as *const usize; // e is a function pointer type and U is an integer; fptr-addr-cast - let _usize_from_fn_ptr_transmute = unsafe { - transmute:: u8, usize>(foo) - }; + let _usize_from_fn_ptr_transmute = unsafe { transmute:: u8, usize>(foo) }; let _usize_from_fn_ptr = foo as *const usize; } diff --git a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.stderr b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.stderr index 46597acc6c0..1157b179317 100644 --- a/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.stderr +++ b/src/tools/clippy/tests/ui/transmutes_expressible_as_ptr_casts.stderr @@ -1,53 +1,53 @@ error: transmute from an integer to a pointer - --> $DIR/transmutes_expressible_as_ptr_casts.rs:20:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:19:39 | -LL | transmute::(usize::MAX) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `usize::MAX as *const i32` +LL | let _ptr_i32_transmute = unsafe { transmute::(usize::MAX) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `usize::MAX as *const i32` | = note: `-D clippy::useless-transmute` implied by `-D warnings` error: transmute from a pointer to a pointer - --> $DIR/transmutes_expressible_as_ptr_casts.rs:26:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:23:38 | -LL | transmute::<*const i32, *const i8>(ptr_i32) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr_i32 as *const i8` +LL | let _ptr_i8_transmute = unsafe { transmute::<*const i32, *const i8>(ptr_i32) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr_i32 as *const i8` | = note: `-D clippy::transmute-ptr-to-ptr` implied by `-D warnings` error: transmute from a pointer to a pointer - --> $DIR/transmutes_expressible_as_ptr_casts.rs:34:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:29:46 | -LL | transmute::<*const [i32], *const [u16]>(slice_ptr) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `slice_ptr as *const [u16]` +LL | let _ptr_to_unsized_transmute = unsafe { transmute::<*const [i32], *const [u16]>(slice_ptr) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `slice_ptr as *const [u16]` error: transmute from `*const i32` to `usize` which could be expressed as a pointer cast instead - --> $DIR/transmutes_expressible_as_ptr_casts.rs:42:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:35:50 | -LL | transmute::<*const i32, usize>(ptr_i32) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr_i32 as usize` +LL | let _usize_from_int_ptr_transmute = unsafe { transmute::<*const i32, usize>(ptr_i32) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `ptr_i32 as usize` | = note: `-D clippy::transmutes-expressible-as-ptr-casts` implied by `-D warnings` error: transmute from a reference to a pointer - --> $DIR/transmutes_expressible_as_ptr_casts.rs:50:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:41:41 | -LL | transmute::<&[i32; 4], *const [i32; 4]>(array_ref) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `array_ref as *const [i32; 4]` +LL | let _array_ptr_transmute = unsafe { transmute::<&[i32; 4], *const [i32; 4]>(array_ref) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `array_ref as *const [i32; 4]` error: transmute from `fn(usize) -> u8 {main::foo}` to `*const usize` which could be expressed as a pointer cast instead - --> $DIR/transmutes_expressible_as_ptr_casts.rs:58:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:49:41 | -LL | transmute:: u8, *const usize>(foo) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `foo as *const usize` +LL | let _usize_ptr_transmute = unsafe { transmute:: u8, *const usize>(foo) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `foo as *const usize` error: transmute from `fn(usize) -> u8 {main::foo}` to `usize` which could be expressed as a pointer cast instead - --> $DIR/transmutes_expressible_as_ptr_casts.rs:64:9 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:53:49 | -LL | transmute:: u8, usize>(foo) - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `foo as usize` +LL | let _usize_from_fn_ptr_transmute = unsafe { transmute:: u8, usize>(foo) }; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `foo as usize` error: transmute from a reference to a pointer - --> $DIR/transmutes_expressible_as_ptr_casts.rs:77:14 + --> $DIR/transmutes_expressible_as_ptr_casts.rs:65:14 | LL | unsafe { transmute::<&[i32; 1], *const u8>(in_param) } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `in_param as *const [i32; 1] as *const u8` diff --git a/src/tools/clippy/tests/ui/try_err.fixed b/src/tools/clippy/tests/ui/try_err.fixed index 29d9139d3e3..9e77dcd8731 100644 --- a/src/tools/clippy/tests/ui/try_err.fixed +++ b/src/tools/clippy/tests/ui/try_err.fixed @@ -6,6 +6,9 @@ #[macro_use] extern crate macro_rules; +use std::io; +use std::task::Poll; + // Tests that a simple case works // Should flag `Err(err)?` pub fn basic_test() -> Result { @@ -104,3 +107,21 @@ pub fn macro_inside(fail: bool) -> Result { } Ok(0) } + +pub fn poll_write(n: usize) -> Poll> { + if n == 0 { + return Poll::Ready(Err(io::ErrorKind::WriteZero.into())) + } else if n == 1 { + return Poll::Ready(Err(io::Error::new(io::ErrorKind::InvalidInput, "error"))) + }; + + Poll::Ready(Ok(n)) +} + +pub fn poll_next(ready: bool) -> Poll>> { + if !ready { + return Poll::Ready(Some(Err(io::ErrorKind::NotFound.into()))) + } + + Poll::Ready(None) +} diff --git a/src/tools/clippy/tests/ui/try_err.rs b/src/tools/clippy/tests/ui/try_err.rs index 5e85d091a2a..41bcb0a189e 100644 --- a/src/tools/clippy/tests/ui/try_err.rs +++ b/src/tools/clippy/tests/ui/try_err.rs @@ -6,6 +6,9 @@ #[macro_use] extern crate macro_rules; +use std::io; +use std::task::Poll; + // Tests that a simple case works // Should flag `Err(err)?` pub fn basic_test() -> Result { @@ -104,3 +107,21 @@ pub fn macro_inside(fail: bool) -> Result { } Ok(0) } + +pub fn poll_write(n: usize) -> Poll> { + if n == 0 { + Err(io::ErrorKind::WriteZero)? + } else if n == 1 { + Err(io::Error::new(io::ErrorKind::InvalidInput, "error"))? + }; + + Poll::Ready(Ok(n)) +} + +pub fn poll_next(ready: bool) -> Poll>> { + if !ready { + Err(io::ErrorKind::NotFound)? + } + + Poll::Ready(None) +} diff --git a/src/tools/clippy/tests/ui/try_err.stderr b/src/tools/clippy/tests/ui/try_err.stderr index 21e9d4048a5..3f1cbc17e72 100644 --- a/src/tools/clippy/tests/ui/try_err.stderr +++ b/src/tools/clippy/tests/ui/try_err.stderr @@ -1,5 +1,5 @@ error: returning an `Err(_)` with the `?` operator - --> $DIR/try_err.rs:15:9 + --> $DIR/try_err.rs:18:9 | LL | Err(err)?; | ^^^^^^^^^ help: try this: `return Err(err)` @@ -11,28 +11,46 @@ LL | #![deny(clippy::try_err)] | ^^^^^^^^^^^^^^^ error: returning an `Err(_)` with the `?` operator - --> $DIR/try_err.rs:25:9 + --> $DIR/try_err.rs:28:9 | LL | Err(err)?; | ^^^^^^^^^ help: try this: `return Err(err.into())` error: returning an `Err(_)` with the `?` operator - --> $DIR/try_err.rs:45:17 + --> $DIR/try_err.rs:48:17 | LL | Err(err)?; | ^^^^^^^^^ help: try this: `return Err(err)` error: returning an `Err(_)` with the `?` operator - --> $DIR/try_err.rs:64:17 + --> $DIR/try_err.rs:67:17 | LL | Err(err)?; | ^^^^^^^^^ help: try this: `return Err(err.into())` error: returning an `Err(_)` with the `?` operator - --> $DIR/try_err.rs:103:9 + --> $DIR/try_err.rs:106:9 | LL | Err(foo!())?; | ^^^^^^^^^^^^ help: try this: `return Err(foo!())` -error: aborting due to 5 previous errors +error: returning an `Err(_)` with the `?` operator + --> $DIR/try_err.rs:113:9 + | +LL | Err(io::ErrorKind::WriteZero)? + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `return Poll::Ready(Err(io::ErrorKind::WriteZero.into()))` + +error: returning an `Err(_)` with the `?` operator + --> $DIR/try_err.rs:115:9 + | +LL | Err(io::Error::new(io::ErrorKind::InvalidInput, "error"))? + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `return Poll::Ready(Err(io::Error::new(io::ErrorKind::InvalidInput, "error")))` + +error: returning an `Err(_)` with the `?` operator + --> $DIR/try_err.rs:123:9 + | +LL | Err(io::ErrorKind::NotFound)? + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `return Poll::Ready(Some(Err(io::ErrorKind::NotFound.into())))` + +error: aborting due to 8 previous errors diff --git a/src/tools/clippy/tests/ui/unknown_attribute.stderr b/src/tools/clippy/tests/ui/unknown_attribute.stderr index 47e37aed246..618c5980d64 100644 --- a/src/tools/clippy/tests/ui/unknown_attribute.stderr +++ b/src/tools/clippy/tests/ui/unknown_attribute.stderr @@ -1,4 +1,4 @@ -error: Usage of unknown attribute +error: usage of unknown attribute --> $DIR/unknown_attribute.rs:1:11 | LL | #[clippy::unknown] diff --git a/src/tools/clippy/tests/ui/unnecessary_ref.stderr b/src/tools/clippy/tests/ui/unnecessary_ref.stderr index 34ba167a947..d0a0f219097 100644 --- a/src/tools/clippy/tests/ui/unnecessary_ref.stderr +++ b/src/tools/clippy/tests/ui/unnecessary_ref.stderr @@ -1,4 +1,4 @@ -error: Creating a reference that is immediately dereferenced. +error: creating a reference that is immediately dereferenced --> $DIR/unnecessary_ref.rs:13:17 | LL | let inner = (&outer).inner; diff --git a/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed b/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed index c017d1cf9a4..31c2ba0f9c5 100644 --- a/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed +++ b/src/tools/clippy/tests/ui/unnecessary_sort_by.fixed @@ -1,5 +1,7 @@ // run-rustfix +#![allow(clippy::stable_sort_primitive)] + use std::cmp::Reverse; fn unnecessary_sort_by() { diff --git a/src/tools/clippy/tests/ui/unnecessary_sort_by.rs b/src/tools/clippy/tests/ui/unnecessary_sort_by.rs index 1929c72b2f2..a3c8ae468ed 100644 --- a/src/tools/clippy/tests/ui/unnecessary_sort_by.rs +++ b/src/tools/clippy/tests/ui/unnecessary_sort_by.rs @@ -1,5 +1,7 @@ // run-rustfix +#![allow(clippy::stable_sort_primitive)] + use std::cmp::Reverse; fn unnecessary_sort_by() { diff --git a/src/tools/clippy/tests/ui/unnecessary_sort_by.stderr b/src/tools/clippy/tests/ui/unnecessary_sort_by.stderr index 903b6e5099c..70c6cf0a3b6 100644 --- a/src/tools/clippy/tests/ui/unnecessary_sort_by.stderr +++ b/src/tools/clippy/tests/ui/unnecessary_sort_by.stderr @@ -1,5 +1,5 @@ error: use Vec::sort here instead - --> $DIR/unnecessary_sort_by.rs:12:5 + --> $DIR/unnecessary_sort_by.rs:14:5 | LL | vec.sort_by(|a, b| a.cmp(b)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort()` @@ -7,37 +7,37 @@ LL | vec.sort_by(|a, b| a.cmp(b)); = note: `-D clippy::unnecessary-sort-by` implied by `-D warnings` error: use Vec::sort here instead - --> $DIR/unnecessary_sort_by.rs:13:5 + --> $DIR/unnecessary_sort_by.rs:15:5 | LL | vec.sort_unstable_by(|a, b| a.cmp(b)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable()` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:14:5 + --> $DIR/unnecessary_sort_by.rs:16:5 | LL | vec.sort_by(|a, b| (a + 5).abs().cmp(&(b + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&a| (a + 5).abs())` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:15:5 + --> $DIR/unnecessary_sort_by.rs:17:5 | LL | vec.sort_unstable_by(|a, b| id(-a).cmp(&id(-b))); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&a| id(-a))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:17:5 + --> $DIR/unnecessary_sort_by.rs:19:5 | LL | vec.sort_by(|a, b| b.cmp(a)); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse(b))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:18:5 + --> $DIR/unnecessary_sort_by.rs:20:5 | LL | vec.sort_by(|a, b| (b + 5).abs().cmp(&(a + 5).abs())); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_by_key(|&b| Reverse((b + 5).abs()))` error: use Vec::sort_by_key here instead - --> $DIR/unnecessary_sort_by.rs:19:5 + --> $DIR/unnecessary_sort_by.rs:21:5 | LL | vec.sort_unstable_by(|a, b| id(-b).cmp(&id(-a))); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `vec.sort_unstable_by_key(|&b| Reverse(id(-b)))` diff --git a/src/tools/clippy/tests/ui/unneeded_field_pattern.stderr b/src/tools/clippy/tests/ui/unneeded_field_pattern.stderr index e7b92ce1e19..b8d3c294532 100644 --- a/src/tools/clippy/tests/ui/unneeded_field_pattern.stderr +++ b/src/tools/clippy/tests/ui/unneeded_field_pattern.stderr @@ -1,19 +1,19 @@ -error: You matched a field with a wildcard pattern. Consider using `..` instead +error: you matched a field with a wildcard pattern, consider using `..` instead --> $DIR/unneeded_field_pattern.rs:14:15 | LL | Foo { a: _, b: 0, .. } => {}, | ^^^^ | = note: `-D clippy::unneeded-field-pattern` implied by `-D warnings` - = help: Try with `Foo { b: 0, .. }` + = help: try with `Foo { b: 0, .. }` -error: All the struct fields are matched to a wildcard pattern, consider using `..`. +error: all the struct fields are matched to a wildcard pattern, consider using `..` --> $DIR/unneeded_field_pattern.rs:16:9 | LL | Foo { a: _, b: _, c: _ } => {}, | ^^^^^^^^^^^^^^^^^^^^^^^^ | - = help: Try with `Foo { .. }` instead + = help: try with `Foo { .. }` instead error: aborting due to 2 previous errors diff --git a/src/tools/clippy/tests/ui/unsafe_derive_deserialize.rs b/src/tools/clippy/tests/ui/unsafe_derive_deserialize.rs index 7bee9c499e1..690d705573d 100644 --- a/src/tools/clippy/tests/ui/unsafe_derive_deserialize.rs +++ b/src/tools/clippy/tests/ui/unsafe_derive_deserialize.rs @@ -57,4 +57,14 @@ impl E { #[derive(Deserialize)] pub struct F {} +// Check that we honor the `allow` attribute on the ADT +#[allow(clippy::unsafe_derive_deserialize)] +#[derive(Deserialize)] +pub struct G {} +impl G { + pub fn unsafe_block(&self) { + unsafe {} + } +} + fn main() {}