## Keyboard shortcuts

Press `←` or `→` to navigate between chapters

Press `S` or `/` to search in the book

Press `?` to show this help

Press `Esc` to hide this help

# Lint Groups

`rustc` has the concept of a "lint group", where you can toggle several warnings through one name.

For example, the `nonstandard-style` lint sets `non-camel-case-types`, `non-snake-case`, and `non-upper-case-globals` all at once. So these are equivalent:

    $ rustc -D nonstandard-style
    $ rustc -D non-camel-case-types -D non-snake-case -D non-upper-case-globals

Here's a list of each lint group, and the lints that they are made up of:

Group | Description | Lints
--- | --- | ---
warnings | All lints that are set to issue warnings | See warn-by-default for the default set of warnings
deprecated-safe | Lints for functions which were erroneously marked as safe in the past | deprecated-safe-2024
future-incompatible | Lints that detect code that has future-compatibility problems | aarch64-softfloat-neon, ambiguous-associated-items, ambiguous-glob-imports, coherence-leak-check, conflicting-repr-hints, const-evaluatable-unchecked, elided-lifetimes-in-associated-constant, forbidden-lint-groups, ill-formed-attribute-input, invalid-type-param-default, late-bound-lifetime-arguments, legacy-derive-helpers, macro-expanded-macro-exports-accessed-by-absolute-paths, out-of-scope-macro-calls, patterns-in-fns-without-body, proc-macro-derive-resolution-fallback, pub-use-of-private-extern-crate, repr-transparent-external-private-fields, self-constructor-from-outer-item, semicolon-in-expressions-from-macros, soft-unstable, uncovered-param-in-projection, uninhabited-static, unstable-name-collisions, unstable-syntax-pre-expansion, unsupported-calling-conventions
keyword-idents | Lints that detect identifiers which will be come keywords in later editions | keyword-idents-2018, keyword-idents-2024
let-underscore | Lints that detect wildcard let bindings that are likely to be invalid | let-underscore-drop, let-underscore-lock
nonstandard-style | Violation of standard naming conventions | non-camel-case-types, non-snake-case, non-upper-case-globals
refining-impl-trait | Detects refinement of `impl Trait` return types by trait implementations | refining-impl-trait-internal, refining-impl-trait-reachable
rust-2018-compatibility | Lints used to transition code from the 2015 edition to 2018 | absolute-paths-not-starting-with-crate, anonymous-parameters, keyword-idents-2018, tyvar-behind-raw-pointer
rust-2018-idioms | Lints to nudge you toward idiomatic features of Rust 2018 | bare-trait-objects, elided-lifetimes-in-paths, ellipsis-inclusive-range-patterns, explicit-outlives-requirements, unused-extern-crates
rust-2021-compatibility | Lints used to transition code from the 2018 edition to 2021 | array-into-iter, bare-trait-objects, ellipsis-inclusive-range-patterns, non-fmt-panics, rust-2021-incompatible-closure-captures, rust-2021-incompatible-or-patterns, rust-2021-prefixes-incompatible-syntax, rust-2021-prelude-collisions
rust-2024-compatibility | Lints used to transition code from the 2021 edition to 2024 | boxed-slice-into-iter, dependency-on-unit-never-type-fallback, deprecated-safe-2024, edition-2024-expr-fragment-specifier, if-let-rescope, impl-trait-overcaptures, keyword-idents-2024, missing-unsafe-on-extern, never-type-fallback-flowing-into-unsafe, rust-2024-guarded-string-incompatible-syntax, rust-2024-incompatible-pat, rust-2024-prelude-collisions, static-mut-refs, tail-expr-drop-order, unsafe-attr-outside-unsafe, unsafe-op-in-unsafe-fn
unknown-or-malformed-diagnostic-attributes | detects unknown or malformed diagnostic attributes | malformed-diagnostic-attributes, malformed-diagnostic-format-literals, misplaced-diagnostic-attributes, unknown-diagnostic-attributes
unused | Lints that detect things being declared but not used, or excess syntax | dead-code, map-unit-fn, path-statements, redundant-semicolons, unreachable-code, unreachable-patterns, unused-allocation, unused-assignments, unused-attributes, unused-braces, unused-doc-comments, unused-extern-crates, unused-features, unused-imports, unused-labels, unused-macro-rules, unused-macros, unused-must-use, unused-mut, unused-parens, unused-unsafe, unused-variables

Additionally, there's a `bad-style` lint group that's a deprecated alias for `nonstandard-style`.

Finally, you can also see the table above by invoking `rustc -W help`. This will give you the exact values for the specific compiler you have installed.