1.16.0.txt (8761B)
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, and deny all overrides) 7 8 9 Lint checks provided by rustc: 10 11 name default meaning 12 ---- ------- ------- 13 box-pointers allow use of owned (Box type) heap memory 14 fat-ptr-transmutes allow detects transmutes of fat pointers 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 trivial-casts allow detects trivial casts which could be removed 19 trivial-numeric-casts allow detects trivial casts of numeric types which could be removed 20 unsafe-code allow usage of `unsafe` code 21 unstable-features allow enabling unstable features (deprecated. do not use) 22 unused-extern-crates allow extern crates that are never used 23 unused-import-braces allow unnecessary braces around an imported item 24 unused-qualifications allow detects unnecessarily qualified names 25 unused-results allow unused result of an expression in a statement 26 variant-size-differences allow detects enums with widely varying variant sizes 27 const-err warn constant evaluation detected erroneous expression 28 dead-code warn detect unused, unexported items 29 deprecated warn detects use of deprecated items 30 deprecated-attr warn detects use of deprecated attributes 31 improper-ctypes warn proper use of libc types in foreign modules 32 legacy-directory-ownership warn non-inline, non-`#[path]` modules (e.g. `mod foo;`) were erroneously allowed in some files not named `mod.rs` 33 legacy-imports warn detects names that resolve to ambiguous glob imports with RFC 1560 34 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 35 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` 36 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 37 non-upper-case-globals warn static constants should have uppercase identifiers 38 no-mangle-generic-items warn generic items must be mangled 39 overflowing-literals warn literal out of range for its type 40 path-statements warn path statements with no effect 41 patterns-in-fns-without-body warn patterns in functions without body were erroneously allowed 42 plugin-as-library warn compiler plugin used as ordinary library in non-plugin crate 43 private-in-public warn detect private items in public interfaces not caught by the old implementation 44 private-no-mangle-fns warn functions marked #[no_mangle] should be exported 45 private-no-mangle-statics warn statics marked #[no_mangle] should be exported 46 raw-pointer-derive warn uses of #[derive] with raw pointers are rarely correct 47 renamed-and-removed-lints warn lints that have been renamed or removed 48 safe-extern-statics warn safe access to extern statics was erroneously allowed 49 stable-features warn stable features found in #[feature] directive 50 unconditional-recursion warn functions that cannot return without calling themselves 51 unions-with-drop-fields warn use of unions that contain fields with possibly non-trivial drop code 52 unknown-lints warn unrecognized lint attribute 53 unreachable-code warn detects unreachable code paths 54 unreachable-patterns warn detects unreachable patterns 55 unused-allocation warn detects unnecessary allocations that can be eliminated 56 unused-assignments warn detect assignments that will never be read 57 unused-attributes warn detects attributes that were not used by the compiler 58 unused-comparisons warn comparisons made useless by limits of the types involved 59 unused-features warn unused or unknown features found in crate-level #[feature] directives 60 unused-imports warn imports that are never used 61 unused-must-use warn unused result of a type flagged as #[must_use] 62 unused-mut warn detect mut variables which don't need to be mutable 63 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 64 unused-unsafe warn unnecessary use of an `unsafe` block 65 unused-variables warn detect variables which are not used in any way 66 warnings warn mass-change the level for lints which produce warnings 67 while-true warn suggest using `loop { }` instead of `while true { }` 68 exceeding-bitshifts deny shift exceeds the type's number of bits 69 extra-requirement-in-impl deny detects extra requirements in impls that were erroneously allowed 70 hr-lifetime-in-assoc-type deny binding for associated type references higher-ranked lifetime that does not appear in the trait input types 71 illegal-floating-point-constant-pattern deny floating-point constants cannot be used in patterns 72 illegal-struct-or-enum-constant-pattern deny constants of struct or enum type can only be used in a pattern if the struct or enum has `#[derive(PartialEq, Eq)]` 73 inaccessible-extern-crate deny use of inaccessible extern crate erroneously allowed 74 invalid-type-param-default deny type parameter default erroneously allowed in invalid location 75 lifetime-underscore deny lifetimes or labels named `'_` were erroneously allowed 76 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 77 no-mangle-const-items deny const items will not have their symbols exported 78 overlapping-inherent-impls deny two overlapping inherent impls define an item with the same name were erroneously allowed 79 super-or-self-in-global-path deny detects super or self keywords at the beginning of global path 80 transmute-from-fn-item-types deny transmute from function item type to pointer-sized type erroneously allowed 81 unknown-crate-types deny unknown crate type found in #[crate_type] directive 82 83 84 Lint groups provided by rustc: 85 86 name sub-lints 87 ---- --------- 88 warnings all built-in lints 89 bad-style non-camel-case-types, non-snake-case, non-upper-case-globals 90 future-incompatible private-in-public, inaccessible-extern-crate, invalid-type-param-default, super-or-self-in-global-path, transmute-from-fn-item-types, overlapping-inherent-impls, illegal-floating-point-constant-pattern, illegal-struct-or-enum-constant-pattern, hr-lifetime-in-assoc-type, lifetime-underscore, safe-extern-statics, patterns-in-fns-without-body, extra-requirement-in-impl, legacy-directory-ownership, legacy-imports 91 unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unreachable-patterns, unused-must-use, unused-unsafe, path-statements, unused-attributes 92 93 94 Compiler plugins can provide additional lints and lint groups. To see a listing of these, re-run `rustc -W help` with a crate filename.