1.51.0.txt (19130B)
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 box-pointers allow use of owned (Box type) heap memory 16 deprecated-in-future allow detects use of items that will be deprecated in a future version 17 disjoint-capture-drop-reorder allow Drop reorder because of `capture_disjoint_fields` 18 elided-lifetimes-in-paths allow hidden lifetime parameters in types are deprecated 19 explicit-outlives-requirements allow outlives requirements can be inferred 20 invalid-html-tags allow detects invalid HTML tags in doc comments 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 meta-variable-misuse allow possible meta-variable misuse at macro definition 24 missing-abi allow No declared ABI for extern declaration 25 missing-copy-implementations allow detects potentially-forgotten implementations of `Copy` 26 missing-crate-level-docs allow detects crates with no crate-level documentation 27 missing-debug-implementations allow detects missing implementations of Debug 28 missing-docs allow detects missing documentation for public members 29 missing-doc-code-examples allow detects publicly-exported items without code samples in their documentation 30 non-ascii-idents allow detects non-ASCII identifiers 31 pointer-structural-match allow pointers are not structural-match 32 private-doc-tests allow detects code samples in docs of private items not documented by rustdoc 33 semicolon-in-expressions-from-macros allow trailing semicolon in macro body used as expression 34 single-use-lifetimes allow detects lifetime parameters that are only used once 35 trivial-casts allow detects trivial casts which could be removed 36 trivial-numeric-casts allow detects trivial casts of numeric types which could be removed 37 unaligned-references allow detects unaligned references to fields of packed structs 38 unreachable-pub allow `pub` items not reachable from crate root 39 unsafe-code allow usage of `unsafe` code 40 unsafe-op-in-unsafe-fn allow unsafe operations in unsafe functions without an explicit unsafe block are deprecated 41 unstable-features allow enabling unstable features (deprecated. do not use) 42 unused-crate-dependencies allow crate dependencies that are never used 43 unused-extern-crates allow extern crates that are never used 44 unused-import-braces allow unnecessary braces around an imported item 45 unused-lifetimes allow detects lifetime parameters that are never used 46 unused-qualifications allow detects unnecessarily qualified names 47 unused-results allow unused result of an expression in a statement 48 variant-size-differences allow detects enums with widely varying variant sizes 49 array-into-iter warn detects calling `into_iter` on arrays 50 asm-sub-register warn using only a subset of a register for inline asm inputs 51 bare-trait-objects warn suggest using `dyn Trait` for trait objects 52 bindings-with-variant-name warn detects pattern bindings with the same name as one of the matched variants 53 broken-intra-doc-links warn failures in resolving intra-doc link targets 54 cenum-impl-drop-cast warn a C-like enum implementing Drop is cast 55 clashing-extern-declarations warn detects when an extern fn has been declared with the same name but different types 56 coherence-leak-check warn distinct impls distinguished only by the leak-check code 57 confusable-idents warn detects visually confusable pairs between identifiers 58 const-evaluatable-unchecked warn detects a generic constant is used in a type without a emitting a warning 59 const-item-mutation warn detects attempts to mutate a `const` item 60 dead-code warn detect unused, unexported items 61 deprecated warn detects use of deprecated items 62 drop-bounds warn bounds of the form `T: Drop` are useless 63 ellipsis-inclusive-range-patterns warn `...` range patterns are deprecated 64 exported-private-dependencies warn public interface leaks type from a private dependency 65 forbidden-lint-groups warn applying forbid to lint-groups 66 function-item-references warn suggest casting to a function pointer when attempting to take references to function items 67 illegal-floating-point-literal-pattern warn floating-point literals cannot be used in patterns 68 improper-ctypes warn proper use of libc types in foreign modules 69 improper-ctypes-definitions warn proper use of libc types in foreign item definitions 70 incomplete-features warn incomplete features that may function improperly in some or all cases 71 indirect-structural-match warn constant used in pattern contains value of non-structural-match type in a field or a variant 72 inline-no-sanitize warn detects incompatible use of `#[inline(always)]` and `#[no_sanitize(...)]` 73 invalid-codeblock-attributes warn codeblock attribute looks a lot like a known one 74 invalid-value warn an invalid value is being created (such as a NULL reference) 75 irrefutable-let-patterns warn detects irrefutable patterns in if-let and while-let statements 76 late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters 77 mixed-script-confusables warn detects Unicode scripts whose mixed script confusables codepoints are solely used 78 mutable-borrow-reservation-conflict warn reservation of a two-phased borrow conflicts with other shared borrows 79 nontrivial-structural-match warn constant used in pattern of non-structural-match type and the constant's initializer expression contains values of non-structural-match types 80 non-autolinks warn detects URLs that could be written using only angle brackets 81 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 82 non-fmt-panic warn detect single-argument panic!() invocations in which the argument is not a format string 83 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` in a pattern 84 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 85 non-upper-case-globals warn static constants should have uppercase identifiers 86 no-mangle-generic-items warn generic items must be mangled 87 overlapping-range-endpoints warn detects range patterns with overlapping endpoints 88 path-statements warn path statements with no effect 89 private-intra-doc-links warn linking from a public item to a private one 90 private-in-public warn detect private items in public interfaces not caught by the old implementation 91 proc-macro-derive-resolution-fallback warn detects proc macro derives using inaccessible names from parent modules 92 redundant-semicolons warn detects unnecessary trailing semicolons 93 renamed-and-removed-lints warn lints that have been renamed or removed 94 safe-packed-borrows warn safe borrows of fields of packed structs were erroneously allowed 95 stable-features warn stable features found in `#[feature]` directive 96 temporary-cstring-as-ptr warn detects getting the inner pointer of a temporary `CString` 97 trivial-bounds warn these bounds don't depend on an type parameters 98 type-alias-bounds warn bounds in type aliases are not enforced 99 tyvar-behind-raw-pointer warn raw pointer to an inference variable 100 uncommon-codepoints warn detects uncommon Unicode codepoints in identifiers 101 unconditional-recursion warn functions that cannot return without calling themselves 102 uninhabited-static warn uninhabited static 103 unknown-lints warn unrecognized lint attribute 104 unnameable-test-items warn detects an item that cannot be named being marked as `#[test_case]` 105 unreachable-code warn detects unreachable code paths 106 unreachable-patterns warn detects unreachable patterns 107 unstable-name-collisions warn detects name collision with an existing but unstable method 108 unsupported-naked-functions warn unsupported naked function definitions 109 unused-allocation warn detects unnecessary allocations that can be eliminated 110 unused-assignments warn detect assignments that will never be read 111 unused-attributes warn detects attributes that were not used by the compiler 112 unused-braces warn unnecessary braces around an expression 113 unused-comparisons warn comparisons made useless by limits of the types involved 114 unused-doc-comments warn detects doc comments that aren't used by rustdoc 115 unused-features warn unused features found in crate-level `#[feature]` directives 116 unused-imports warn imports that are never used 117 unused-labels warn detects labels that are never used 118 unused-macros warn detects macros that were not used 119 unused-must-use warn unused result of a type flagged as `#[must_use]` 120 unused-mut warn detect mut variables which don't need to be mutable 121 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 122 unused-unsafe warn unnecessary use of an `unsafe` block 123 unused-variables warn detect variables which are not used in any way 124 warnings warn mass-change the level for lints which produce warnings 125 where-clauses-object-safety warn checks the object safety of where clauses 126 while-true warn suggest using `loop { }` instead of `while true { }` 127 ambiguous-associated-items deny ambiguous associated items 128 arithmetic-overflow deny arithmetic operation overflows 129 conflicting-repr-hints deny conflicts between `#[repr(..)]` hints that were previously accepted and used in practice 130 const-err deny constant evaluation encountered erroneous expression 131 ill-formed-attribute-input deny ill-formed attribute inputs that were previously accepted and used in practice 132 incomplete-include deny trailing content in included file 133 ineffective-unstable-trait-impl deny detects `#[unstable]` on stable trait implementations for stable types 134 invalid-type-param-default deny type parameter default erroneously allowed in invalid location 135 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 136 missing-fragment-specifier deny detects missing fragment specifiers in unused `macro_rules!` patterns 137 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 138 no-mangle-const-items deny const items will not have their symbols exported 139 order-dependent-trait-objects deny trait-object types were treated as different depending on marker-trait order 140 overflowing-literals deny literal out of range for its type 141 patterns-in-fns-without-body deny patterns in functions without body were erroneously allowed 142 pub-use-of-private-extern-crate deny detect public re-exports of private extern crates 143 soft-unstable deny a feature gate that doesn't break dependent crates 144 unconditional-panic deny operation will cause a panic at runtime 145 unknown-crate-types deny unknown crate type found in `#[crate_type]` directive 146 useless-deprecated deny detects deprecation attributes with no effect 147 148 149 Lint groups provided by rustc: 150 151 name sub-lints 152 ---- --------- 153 warnings all lints that are set to issue warnings 154 future-incompatible keyword-idents, anonymous-parameters, forbidden-lint-groups, illegal-floating-point-literal-pattern, private-in-public, pub-use-of-private-extern-crate, invalid-type-param-default, const-err, safe-packed-borrows, patterns-in-fns-without-body, missing-fragment-specifier, late-bound-lifetime-arguments, order-dependent-trait-objects, coherence-leak-check, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate, unstable-name-collisions, where-clauses-object-safety, proc-macro-derive-resolution-fallback, macro-expanded-macro-exports-accessed-by-absolute-paths, ill-formed-attribute-input, conflicting-repr-hints, ambiguous-associated-items, mutable-borrow-reservation-conflict, indirect-structural-match, pointer-structural-match, nontrivial-structural-match, soft-unstable, cenum-impl-drop-cast, const-evaluatable-unchecked, uninhabited-static, unsupported-naked-functions, semicolon-in-expressions-from-macros, array-into-iter 155 nonstandard-style non-camel-case-types, non-snake-case, non-upper-case-globals 156 rust-2018-compatibility keyword-idents, anonymous-parameters, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate 157 rust-2018-idioms bare-trait-objects, unused-extern-crates, ellipsis-inclusive-range-patterns, elided-lifetimes-in-paths, explicit-outlives-requirements 158 rustdoc non-autolinks, broken-intra-doc-links, private-intra-doc-links, invalid-codeblock-attributes, missing-doc-code-examples, private-doc-tests, invalid-html-tags 159 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, unused-braces, redundant-semicolons 160 161 162 Lint tools like Clippy can provide additional lints and lint groups.