1.41.1.txt (13971B)
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 elided-lifetimes-in-paths allow hidden lifetime parameters in types are deprecated 18 explicit-outlives-requirements allow outlives requirements can be inferred 19 indirect-structural-match allow pattern with const indirectly referencing non-`#[structural_match]` type 20 keyword-idents allow detects edition keywords being used as an identifier 21 macro-use-extern-crate allow the `#[macro_use]` attribute is now deprecated in favor of using macros via the module system 22 meta-variable-misuse allow possible meta-variable misuse at macro definition 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 non-ascii-idents allow detects non-ASCII identifiers 28 private-doc-tests allow detects code samples in docs of private items not documented by rustdoc 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-lifetimes allow detects lifetime parameters that are never used 38 unused-qualifications allow detects unnecessarily qualified names 39 unused-results allow unused result of an expression in a statement 40 variant-size-differences allow detects enums with widely varying variant sizes 41 array-into-iter warn detects calling `into_iter` on arrays 42 bare-trait-objects warn suggest using `dyn Trait` for trait objects 43 dead-code warn detect unused, unexported items 44 deprecated warn detects use of deprecated items 45 ellipsis-inclusive-range-patterns warn `...` range patterns are deprecated 46 exported-private-dependencies warn public interface leaks type from a private dependency 47 illegal-floating-point-literal-pattern warn floating-point literals cannot be used in patterns 48 improper-ctypes warn proper use of libc types in foreign modules 49 incomplete-features warn incomplete features that may function improperly in some or all cases 50 intra-doc-link-resolution-failure warn failures in resolving intra-doc link targets 51 invalid-value warn an invalid value is being created (such as a NULL reference) 52 irrefutable-let-patterns warn detects irrefutable patterns in if-let and while-let statements 53 late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters 54 mutable-borrow-reservation-conflict warn reservation of a two-phased borrow conflicts with other shared borrows 55 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 56 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` in a pattern 57 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 58 non-upper-case-globals warn static constants should have uppercase identifiers 59 no-mangle-generic-items warn generic items must be mangled 60 overlapping-patterns warn detects overlapping patterns 61 path-statements warn path statements with no effect 62 private-in-public warn detect private items in public interfaces not caught by the old implementation 63 proc-macro-derive-resolution-fallback warn detects proc macro derives using inaccessible names from parent modules 64 redundant-semicolon warn detects unnecessary trailing semicolons 65 renamed-and-removed-lints warn lints that have been renamed or removed 66 safe-packed-borrows warn safe borrows of fields of packed structs were was erroneously allowed 67 stable-features warn stable features found in `#[feature]` directive 68 trivial-bounds warn these bounds don't depend on an type parameters 69 type-alias-bounds warn bounds in type aliases are not enforced 70 tyvar-behind-raw-pointer warn raw pointer to an inference variable 71 unconditional-recursion warn functions that cannot return without calling themselves 72 unknown-lints warn unrecognized lint attribute 73 unnameable-test-items warn detects an item that cannot be named being marked as `#[test_case]` 74 unreachable-code warn detects unreachable code paths 75 unreachable-patterns warn detects unreachable patterns 76 unstable-name-collisions warn detects name collision with an existing but unstable method 77 unused-allocation warn detects unnecessary allocations that can be eliminated 78 unused-assignments warn detect assignments that will never be read 79 unused-attributes warn detects attributes that were not used by the compiler 80 unused-comparisons warn comparisons made useless by limits of the types involved 81 unused-doc-comments warn detects doc comments that aren't used by rustdoc 82 unused-features warn unused features found in crate-level `#[feature]` directives 83 unused-imports warn imports that are never used 84 unused-labels warn detects labels that are never used 85 unused-macros warn detects macros that were not used 86 unused-must-use warn unused result of a type flagged as `#[must_use]` 87 unused-mut warn detect mut variables which don't need to be mutable 88 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 89 unused-unsafe warn unnecessary use of an `unsafe` block 90 unused-variables warn detect variables which are not used in any way 91 warnings warn mass-change the level for lints which produce warnings 92 where-clauses-object-safety warn checks the object safety of where clauses 93 while-true warn suggest using `loop { }` instead of `while true { }` 94 ambiguous-associated-items deny ambiguous associated items 95 const-err deny constant evaluation detected erroneous expression 96 exceeding-bitshifts deny shift exceeds the type's number of bits 97 ill-formed-attribute-input deny ill-formed attribute inputs that were previously accepted and used in practice 98 invalid-type-param-default deny type parameter default erroneously allowed in invalid location 99 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 100 missing-fragment-specifier deny detects missing fragment specifiers in unused `macro_rules!` patterns 101 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 102 no-mangle-const-items deny const items will not have their symbols exported 103 order-dependent-trait-objects deny trait-object types were treated as different depending on marker-trait order 104 overflowing-literals deny literal out of range for its type 105 patterns-in-fns-without-body deny patterns in functions without body were erroneously allowed 106 pub-use-of-private-extern-crate deny detect public re-exports of private extern crates 107 soft-unstable deny a feature gate that doesn't break dependent crates 108 unknown-crate-types deny unknown crate type found in `#[crate_type]` directive 109 110 111 Lint groups provided by rustc: 112 113 name sub-lints 114 ---- --------- 115 warnings all lints that are set to issue warnings 116 future-incompatible keyword-idents, anonymous-parameters, illegal-floating-point-literal-pattern, private-in-public, pub-use-of-private-extern-crate, invalid-type-param-default, safe-packed-borrows, patterns-in-fns-without-body, missing-fragment-specifier, late-bound-lifetime-arguments, order-dependent-trait-objects, 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, ambiguous-associated-items, mutable-borrow-reservation-conflict, indirect-structural-match, soft-unstable, array-into-iter 117 nonstandard-style non-camel-case-types, non-snake-case, non-upper-case-globals 118 rust-2018-compatibility keyword-idents, anonymous-parameters, tyvar-behind-raw-pointer, absolute-paths-not-starting-with-crate 119 rust-2018-idioms bare-trait-objects, unused-extern-crates, ellipsis-inclusive-range-patterns, elided-lifetimes-in-paths, explicit-outlives-requirements 120 rustdoc intra-doc-link-resolution-failure, missing-doc-code-examples, private-doc-tests 121 unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unreachable-patterns, overlapping-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 122 123 124 Compiler plugins can provide additional lints and lint groups. To see a listing of these, re-run `rustc -W help` with a crate filename.