https://errorvault.dev/tags/e0401/ Recent content in E0401 on ErrorVault — Developer Error Code Dictionary Hugo en-us Sat, 25 Jul 2026 12:44:04 +0800 https://errorvault.dev/rust/rust-e0401-cannot-find-type-scope/ Sat, 25 Jul 2026 12:44:04 +0800 https://errorvault.dev/rust/rust-e0401-cannot-find-type-scope/ <h2 id="1-symptoms">1. Symptoms</h2> <p>The Rust compiler produces error E0401 when it encounters a reference to a type that does not exist in the current scope. This error manifests with a clear diagnostic message that identifies both the problematic type and its location in your source code. The compiler provides line and column information to help you locate the exact position of the unresolvable type reference.</p> <p>Typical error output from the Rust compiler looks like this:</p>