https://errorvault.dev/tags/label/ Recent content in Label on ErrorVault — Developer Error Code Dictionary Hugo en-us Wed, 03 Jun 2026 19:56:04 +0800 https://errorvault.dev/rust/rust-e0518-invalid-label/ Wed, 03 Jun 2026 19:56:04 +0800 https://errorvault.dev/rust/rust-e0518-invalid-label/ <h1 id="fix-e0518-invalid-label">Fix E0518: invalid label</h1> <p>Rust&rsquo;s <strong>E0518</strong> error is emitted when you place a label on a construct that cannot legally carry a label. In Rust, labels (<code>'label_name</code>) are only valid on loop and block expressions—nowhere else. Attaching a label to an <code>if</code> expression, match arm, or function call triggers this error.</p> <h2 id="1-symptoms">1. Symptoms</h2> <p>You will see the error manifest in one of two ways during compilation:</p> <h2 id="primary-error-message"><strong>Primary error message:</strong></h2> <p>error[E0518]: invalid label &ndash;&gt; src/main.rs:5:5 | 5 | &lsquo;block: { break &lsquo;block; }; | ^^^^^^ | = note: labels on blocks are only allowed in <code>break</code> with a value</p>