Rust has a strong policy of adding tests when adding/changing code, so almost all error messages are tested in some form, including "UI" tests, that check the e

Rust has a strong policy of adding tests when adding/changing code, so almost all error messages are tested in some form, including "UI" tests, that check the exact formatting. Additionally, there's https://doc.rust-lang.org/error-index.html https://doc.rust-lang.org/error-index.html