Fix E0562: extern crate cannot be imported as non-default module name

Sun, 09 Aug 2026 00:44:04 +0800

1. Symptoms

When the Rust compiler encounters error E0562, you will see a diagnostic message similar to the following in your build output:

error[E0562]: extern crate cannot be imported as non-default module name
 --> src/main.rs:3:1
  |
3 | extern crate serde as match;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: the crate `serde` cannot be imported as non-default module name `match`

The error indicates that the identifier you attempted to use after the as keyword is not a valid Rust module name. This typically manifests when you try to rename an external crate to a reserved keyword, a name beginning with a numeric digit, or an identifier containing invalid characters for Rust modules.

Mod on ErrorVault — Developer Error Code Dictionary

Fix E0562: extern crate cannot be imported as non-default module name

1. Symptoms