1.33.0.txt (13665B)
1 2 Available lint options: 3 -W <foo> Warn about <foo> 4 -A <foo> Allow <foo> 5 -D <foo> Deny <foo> 6 -F <foo> Forbid <foo> (deny <foo> and all attempts to override) 7 8 9 Lint checks provided by rustc: 10 11 name default meaning 12 ---- ------- ------- 13 absolute-paths-not-starting-with-crate allow fully qualified paths that start with a module name instead of `crate`, `self`, or an extern crate name 14 anonymous-parameters allow detects anonymous parameters 15 bare-trait-objects allow suggest using `dyn Trait` for trait objects 16 box-pointers allow use of owned (Box type) heap memory 17 deprecated-in-future allow detects use of items that will be deprecated in a future version 18 elided-lifetimes-in-paths allow hidden lifetime parameters in types are deprecated 19 ellipsis-inclusive-range-patterns allow `...` range patterns are deprecated 20 explicit-outlives-requirements allow outlives requirements can be inferred 21 keyword-idents allow detects edition keywords being used as an identifier 22 macro-use-extern-crate allow the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system 23 missing-copy-implementations allow detects potentially-forgotten implementations of `Copy` 24 missing-debug-implementations allow detects missing implementations of fmt::Debug 25 missing-docs allow detects missing documentation for public members 26 missing-doc-code-examples allow detects publicly-exported items without code samples in their documentation 27 private-doc-tests allow detects code samples in docs of private items not documented by rustdoc 28 question-mark-macro-sep allow detects the use of `?` as a macro separator 29 single-use-lifetimes allow detects lifetime parameters that are only used once 30 trivial-casts allow detects trivial casts which could be removed 31 trivial-numeric-casts allow detects trivial casts of numeric types which could be removed 32 unreachable-pub allow `pub` items not reachable from crate root 33 unsafe-code allow usage of `unsafe` code 34 unstable-features allow enabling unstable features (deprecated. do not use) 35 unused-extern-crates allow extern crates that are never used 36 unused-import-braces allow unnecessary braces around an imported item 37 unused-labels allow detects labels that are never used 38 unused-lifetimes allow detects lifetime parameters that are never used 39 unused-qualifications allow detects unnecessarily qualified names 40 unused-results allow unused result of an expression in a statement 41 variant-size-differences allow detects enums with widely varying variant sizes 42 dead-code warn detect unused, unexported items 43 deprecated warn detects use of deprecated items 44 illegal-floating-point-literal-pattern warn floating-point literals cannot be used in patterns 45 improper-ctypes warn proper use of libc types in foreign modules 46 intra-doc-link-resolution-failure warn failures in resolving intra-doc link targets 47 irrefutable-let-patterns warn detects irrefutable patterns in if-let and while-let statements 48 late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters 49 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 50 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` in a pattern 51 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 52 non-upper-case-globals warn static constants should have uppercase identifiers 53 no-mangle-generic-items warn generic items must be mangled 54 overflowing-literals warn literal out of range for its type 55 path-statements warn path statements with no effect 56 patterns-in-fns-without-body warn patterns in functions without body were erroneously allowed 57 plugin-as-library warn compiler plugin used as ordinary library in non-plugin crate 58 private-in-public warn detect private items in public interfaces not caught by the old implementation 59 proc-macro-derive-resolution-fallback warn detects proc macro derives using inaccessible names from parent modules 60 renamed-and-removed-lints warn lints that have been renamed or removed 61 safe-packed-borrows warn safe borrows of fields of packed structs were was erroneously allowed 62 stable-features warn stable features found in #[feature] directive 63 trivial-bounds warn these bounds don't depend on an type parameters 64 type-alias-bounds warn bounds in type aliases are not enforced 65 tyvar-behind-raw-pointer warn raw pointer to an inference variable 66 unconditional-recursion warn functions that cannot return without calling themselves 67 unions-with-drop-fields warn use of unions that contain fields with possibly non-trivial drop code 68 unknown-lints warn unrecognized lint attribute 69 unnameable-test-items warn detects an item that cannot be named being marked as #[test_case] 70 unreachable-code warn detects unreachable code paths 71 unreachable-patterns warn detects unreachable patterns 72 unstable-name-collisions warn detects name collision with an existing but unstable method 73 unused-allocation warn detects unnecessary allocations that can be eliminated 74 unused-assignments warn detect assignments that will never be read 75 unused-attributes warn detects attributes that were not used by the compiler 76 unused-comparisons warn comparisons made useless by limits of the types involved 77 unused-doc-comments warn detects doc comments that aren't used by rustdoc 78 unused-features warn unused features found in crate-level #[feature] directives 79 unused-imports warn imports that are never used 80 unused-macros warn detects macros that were not used 81 unused-must-use warn unused result of a type flagged as #[must_use] 82 unused-mut warn detect mut variables which don't need to be mutable 83 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 84 unused-unsafe warn unnecessary use of an `unsafe` block 85 unused-variables warn detect variables which are not used in any way 86 warnings warn mass-change the level for lints which produce warnings 87 where-clauses-object-safety warn checks the object safety of where clauses 88 while-true warn suggest using `loop { }` instead of `while true { }` 89 const-err deny constant evaluation detected erroneous expression 90 duplicate-macro-exports deny detects duplicate macro exports 91 exceeding-bitshifts deny shift exceeds the type's number of bits 92 incoherent-fundamental-impls deny potentially-conflicting impls were erroneously allowed 93 invalid-type-param-default deny type parameter default erroneously allowed in invalid location 94 legacy-constructor-visibility deny detects use of struct constructors that would be invisible with new visibility rules 95 legacy-directory-ownership deny non-inline, non-`#[path]` modules (e.g., `mod foo;`) were erroneously allowed in some files not named `mod.rs` 96 macro-expanded-macro-exports-accessed-by-absolute-paths deny macro-expanded `macro_export` macros from the current crate cannot be referred to by absolute paths 97 missing-fragment-specifier deny detects missing fragment specifiers in unused `macro_rules!` patterns 98 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 99 no-mangle-const-items deny const items will not have their symbols exported 100 order-dependent-trait-objects deny trait-object types were treated as different depending on marker-trait order 101 parenthesized-params-in-types-and-modules deny detects parenthesized generic parameters in type and module names 102 pub-use-of-private-extern-crate deny detect public re-exports of private extern crates 103 safe-extern-statics deny safe access to extern statics was erroneously allowed 104 unknown-crate-types deny unknown crate type found in #[crate_type] directive 105 106 107 Lint groups provided by rustc: 108 109 name sub-lints 110 ---- --------- 111 warnings all lints that are set to issue warnings 112 future-incompatible private-in-public, pub-use-of-private-extern-crate, patterns-in-fns-without-body, duplicate-macro-exports, keyword-idents, safe-extern-statics, invalid-type-param-default, legacy-directory-ownership, legacy-constructor-visibility, missing-fragment-specifier, illegal-floating-point-literal-pattern, anonymous-parameters, parenthesized-params-in-types-and-modules, late-bound-lifetime-arguments, safe-packed-borrows, incoherent-fundamental-impls, order-dependent-trait-objects, tyvar-behind-raw-pointer, unstable-name-collisions, absolute-paths-not-starting-with-crate, where-clauses-object-safety, proc-macro-derive-resolution-fallback, question-mark-macro-sep, macro-expanded-macro-exports-accessed-by-absolute-paths 113 nonstandard-style non-camel-case-types, non-snake-case, non-upper-case-globals 114 rust-2018-compatibility duplicate-macro-exports, keyword-idents, anonymous-parameters, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate, question-mark-macro-sep 115 rust-2018-idioms bare-trait-objects, unused-extern-crates, ellipsis-inclusive-range-patterns, elided-lifetimes-in-paths, explicit-outlives-requirements 116 rustdoc intra-doc-link-resolution-failure, missing-doc-code-examples, private-doc-tests 117 unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unreachable-patterns, unused-must-use, unused-unsafe, path-statements, unused-attributes, unused-macros, unused-allocation, unused-doc-comments, unused-extern-crates, unused-features, unused-labels, unused-parens 118 119 120 Compiler plugins can provide additional lints and lint groups. To see a listing of these, re-run `rustc -W help` with a crate filename.