https://errorvault.dev/tags/e0264/ Recent content in E0264 on ErrorVault — Developer Error Code Dictionary Hugo en-us Thu, 23 Jul 2026 10:20:04 +0800 https://errorvault.dev/rust/rust-e0264-invalid-label/ Thu, 23 Jul 2026 10:20:04 +0800 https://errorvault.dev/rust/rust-e0264-invalid-label/ <h2 id="1-symptoms">1. Symptoms</h2> <p>When the Rust compiler encounters error E0264, you will see output similar to the following:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-fallback" data-lang="fallback"><span style="display:flex;"><span>error[E0264]: invalid label </span></span><span style="display:flex;"><span> --&gt; src/main.rs:5:5 </span></span><span style="display:flex;"><span> | </span></span><span style="display:flex;"><span>5 | break &#39; outer; </span></span><span style="display:flex;"><span> | ^^^^^^^ invalid label </span></span></code></pre></div><p>The compiler marks the problematic label with a caret (<code>^^^^^^</code>) pointing to the exact position of the error. Labels in Rust are identifiers prefixed with an apostrophe (<code>'</code>), and they are used exclusively with <code>break</code> and <code>continue</code> statements to control which enclosing loop to exit or continue.</p>