1.24.1.txt (9583B)
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 anonymous-parameters allow detects anonymous parameters 14 box-pointers allow use of owned (Box type) heap memory 15 missing-copy-implementations allow detects potentially-forgotten implementations of `Copy` 16 missing-debug-implementations allow detects missing implementations of fmt::Debug 17 missing-docs allow detects missing documentation for public members 18 single-use-lifetime allow detects single use lifetimes 19 trivial-casts allow detects trivial casts which could be removed 20 trivial-numeric-casts allow detects trivial casts of numeric types which could be removed 21 unreachable-pub allow `pub` items not reachable from crate root 22 unsafe-code allow usage of `unsafe` code 23 unstable-features allow enabling unstable features (deprecated. do not use) 24 unused-extern-crates allow extern crates that are never used 25 unused-import-braces allow unnecessary braces around an imported item 26 unused-qualifications allow detects unnecessarily qualified names 27 unused-results allow unused result of an expression in a statement 28 variant-size-differences allow detects enums with widely varying variant sizes 29 const-err warn constant evaluation detected erroneous expression 30 dead-code warn detect unused, unexported items 31 deprecated warn detects use of deprecated items 32 illegal-floating-point-literal-pattern warn floating-point literals cannot be used in patterns 33 improper-ctypes warn proper use of libc types in foreign modules 34 incoherent-fundamental-impls warn potentially-conflicting impls were erroneously allowed 35 late-bound-lifetime-arguments warn detects generic lifetime arguments in path segments with late bound lifetime parameters 36 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 37 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` in a pattern 38 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 39 non-upper-case-globals warn static constants should have uppercase identifiers 40 no-mangle-generic-items warn generic items must be mangled 41 overflowing-literals warn literal out of range for its type 42 path-statements warn path statements with no effect 43 patterns-in-fns-without-body warn patterns in functions without body were erroneously allowed 44 plugin-as-library warn compiler plugin used as ordinary library in non-plugin crate 45 private-in-public warn detect private items in public interfaces not caught by the old implementation 46 private-no-mangle-fns warn functions marked #[no_mangle] should be exported 47 private-no-mangle-statics warn statics marked #[no_mangle] should be exported 48 renamed-and-removed-lints warn lints that have been renamed or removed 49 safe-packed-borrows warn safe borrows of fields of packed structs were was erroneously allowed 50 stable-features warn stable features found in #[feature] directive 51 tyvar-behind-raw-pointer warn raw pointer to an inference variable 52 unconditional-recursion warn functions that cannot return without calling themselves 53 unions-with-drop-fields warn use of unions that contain fields with possibly non-trivial drop code 54 unknown-lints warn unrecognized lint attribute 55 unreachable-code warn detects unreachable code paths 56 unreachable-patterns warn detects unreachable patterns 57 unused-allocation warn detects unnecessary allocations that can be eliminated 58 unused-assignments warn detect assignments that will never be read 59 unused-attributes warn detects attributes that were not used by the compiler 60 unused-comparisons warn comparisons made useless by limits of the types involved 61 unused-doc-comment warn detects doc comments that aren't used by rustdoc 62 unused-features warn unused or unknown features found in crate-level #[feature] directives 63 unused-imports warn imports that are never used 64 unused-macros warn detects macros that were not used 65 unused-must-use warn unused result of a type flagged as #[must_use] 66 unused-mut warn detect mut variables which don't need to be mutable 67 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 68 unused-unsafe warn unnecessary use of an `unsafe` block 69 unused-variables warn detect variables which are not used in any way 70 warnings warn mass-change the level for lints which produce warnings 71 while-true warn suggest using `loop { }` instead of `while true { }` 72 auto-impl deny The form `impl Foo for .. {}` will be removed, please use `auto trait Foo {}` 73 coerce-never deny detect coercion to ! 74 exceeding-bitshifts deny shift exceeds the type's number of bits 75 invalid-type-param-default deny type parameter default erroneously allowed in invalid location 76 legacy-constructor-visibility deny detects use of struct constructors that would be invisible with new visibility rules 77 legacy-directory-ownership deny non-inline, non-`#[path]` modules (e.g. `mod foo;`) were erroneously allowed in some files not named `mod.rs` 78 legacy-imports deny detects names that resolve to ambiguous glob imports with RFC 1560 79 missing-fragment-specifier deny detects missing fragment specifiers in unused `macro_rules!` patterns 80 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 81 no-mangle-const-items deny const items will not have their symbols exported 82 parenthesized-params-in-types-and-modules deny detects parenthesized generic parameters in type and module names 83 pub-use-of-private-extern-crate deny detect public reexports of private extern crates 84 resolve-trait-on-defaulted-unit deny attempt to resolve a trait on an expression whose type cannot be inferred but which currently defaults to () 85 safe-extern-statics deny safe access to extern statics was erroneously allowed 86 unknown-crate-types deny unknown crate type found in #[crate_type] directive 87 88 89 Lint groups provided by rustc: 90 91 name sub-lints 92 ---- --------- 93 warnings all lints that are set to issue warnings 94 bad-style non-camel-case-types, non-snake-case, non-upper-case-globals 95 future-incompatible auto-impl, private-in-public, pub-use-of-private-extern-crate, patterns-in-fns-without-body, safe-extern-statics, invalid-type-param-default, legacy-directory-ownership, legacy-imports, legacy-constructor-visibility, resolve-trait-on-defaulted-unit, 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, coerce-never, tyvar-behind-raw-pointer 96 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-comment, unused-extern-crates, unused-features, unused-parens 97 98 99 Compiler plugins can provide additional lints and lint groups. To see a listing of these, re-run `rustc -W help` with a crate filename.