1.6.0.txt (6112B)
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 #[rustc_deprecated] items 30 drop-with-repr-extern warn use of #[repr(C)] on a type that implements Drop 31 improper-ctypes warn proper use of libc types in foreign modules 32 match-of-unit-variant-via-paren-dotdot warn unit struct or enum variant erroneously allowed to match via path::ident(..) 33 non-camel-case-types warn types, variants, traits and type parameters should have camel case names 34 non-shorthand-field-patterns warn using `Struct { x: x }` instead of `Struct { x }` 35 non-snake-case warn variables, methods, functions, lifetime parameters and modules should have snake case names 36 non-upper-case-globals warn static constants should have uppercase identifiers 37 overflowing-literals warn literal out of range for its type 38 path-statements warn path statements with no effect 39 plugin-as-library warn compiler plugin used as ordinary library in non-plugin crate 40 private-no-mangle-fns warn functions marked #[no_mangle] should be exported 41 private-no-mangle-statics warn statics marked #[no_mangle] should be exported 42 raw-pointer-derive warn uses of #[derive] with raw pointers are rarely correct 43 stable-features warn stable features found in #[feature] directive 44 unconditional-recursion warn functions that cannot return without calling themselves 45 unknown-lints warn unrecognized lint attribute 46 unreachable-code warn detects unreachable code paths 47 unused-allocation warn detects unnecessary allocations that can be eliminated 48 unused-assignments warn detect assignments that will never be read 49 unused-attributes warn detects attributes that were not used by the compiler 50 unused-comparisons warn comparisons made useless by limits of the types involved 51 unused-features warn unused or unknown features found in crate-level #[feature] directives 52 unused-imports warn imports that are never used 53 unused-must-use warn unused result of a type flagged as #[must_use] 54 unused-mut warn detect mut variables which don't need to be mutable 55 unused-parens warn `if`, `match`, `while` and `return` do not need parentheses 56 unused-unsafe warn unnecessary use of an `unsafe` block 57 unused-variables warn detect variables which are not used in any way 58 warnings warn mass-change the level for lints which produce warnings 59 while-true warn suggest using `loop { }` instead of `while true { }` 60 exceeding-bitshifts deny shift exceeds the type's number of bits 61 mutable-transmutes deny mutating transmuted &mut T from &T may cause undefined behavior 62 no-mangle-const-items deny const items will not have their symbols exported 63 unknown-crate-types deny unknown crate type found in #[crate_type] directive 64 65 66 Lint groups provided by rustc: 67 68 name sub-lints 69 ---- --------- 70 bad-style non-camel-case-types, non-snake-case, non-upper-case-globals 71 future-incompatible match-of-unit-variant-via-paren-dotdot 72 unused unused-imports, unused-variables, unused-assignments, dead-code, unused-mut, unreachable-code, unused-must-use, unused-unsafe, path-statements, unused-attributes 73 74 75 Compiler plugins can provide additional lints and lint groups. To see a listing of these, re-run `rustc -W help` with a crate filename.