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<ol class="chapter"><li><a href="what-is-rustc.html"><strong aria-hidden="true">1.</strong> What is rustc?</a></li><li><a href="command-line-arguments.html"><strong aria-hidden="true">2.</strong> Command-line arguments</a></li><li><a href="lints/index.html"><strong aria-hidden="true">3.</strong> Lints</a></li><li><ol class="section"><li><a href="lints/levels.html"><strong aria-hidden="true">3.1.</strong> Lint levels</a></li><li><a href="lints/groups.html" class="active"><strong aria-hidden="true">3.2.</strong> Lint Groups</a></li><li><a href="lints/listing/index.html"><strong aria-hidden="true">3.3.</strong> Lint listing</a></li><li><ol class="section"><li><a href="lints/listing/allowed-by-default.html"><strong aria-hidden="true">3.3.1.</strong> Allowed-by-default lints</a></li><li><a href="lints/listing/warn-by-default.html"><strong aria-hidden="true">3.3.2.</strong> Warn-by-default lints</a></li><li><a href="lints/listing/deny-by-default.html"><strong aria-hidden="true">3.3.3.</strong> Deny-by-default lints</a></li></ol></li></ol></li><li><a href="codegen-options/index.html"><strong aria-hidden="true">4.</strong> Codegen options</a></li><li><a href="targets/index.html"><strong aria-hidden="true">5.</strong> Targets</a></li><li><ol class="section"><li><a href="targets/built-in.html"><strong aria-hidden="true">5.1.</strong> Built-in Targets</a></li><li><a href="targets/custom.html"><strong aria-hidden="true">5.2.</strong> Custom Targets</a></li></ol></li><li><a href="contributing.html"><strong aria-hidden="true">6.</strong> Contributing to rustc</a></li></ol>
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<a class="header" href="lints/groups.html#lint-groups" id="lint-groups"><h1>Lint Groups</h1></a>
<p><code>rustc</code> has the concept of a "lint group", where you can toggle several warnings
through one name.</p>
<p>For example, the <code>nonstandard-style</code> lint sets <code>non-camel-case-types</code>,
<code>non-snake-case</code>, and <code>non-upper-case-globals</code> all at once. So these are
equivalent:</p>
<pre><code class="language-bash">$ rustc -D nonstandard-style
$ rustc -D non-camel-case-types -D non-snake-case -D non-upper-case-globals
</code></pre>
<p>Here's a list of each lint group, and the lints that they are made up of:</p>
<table><thead><tr><th> group </th><th> description </th><th> lints </th></tr></thead><tbody>
<tr><td> nonstandard-style </td><td> Violation of standard naming conventions </td><td> non-camel-case-types, non-snake-case, non-upper-case-globals </td></tr>
<tr><td> warnings </td><td> all lints that would be issuing warnings </td><td> all lints that would be issuing warnings </td></tr>
<tr><td> edition-2018 </td><td> Lints that will be turned into errors in Rust 2018 </td><td> tyvar-behind-raw-pointer </td></tr>
<tr><td> rust-2018-idioms </td><td> Lints to nudge you toward idiomatic features of Rust 2018 </td><td> bare-trait-object, unreachable-pub </td></tr>
<tr><td> unused </td><td> These lints detect things being declared but not used </td><td> 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 </td></tr>
<tr><td> future-incompatible </td><td> Lints that detect code that has future-compatibility problems </td><td> 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, 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, tyvar-behind-raw-pointer, unstable-name-collision </td></tr>
</tbody></table>
<p>Additionally, there's a <code>bad-style</code> lint group that's a deprecated alias for <code>nonstandard-style</code>.</p>
<p>Finally, you can also see the table above by invoking <code>rustc -W help</code>. This will give you the exact values for the specific
compiler you have installed.</p>
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