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Rust has the Error type. Libraries are add-ons and not part of the language.

• tialaramex 1y ago
  Well, Rust's standard library provides two types named Error, their full names are core::fmt::Error (aka std::fmt::Error) and std::io::Error But, neither of these is intended as "the" error type - unless you're a formatter or an I/O abstraction they're not the error types you want. Rust provides a trait core::error::Error (aka std::error::Error) and that might be what you're thinking about. It's recommended that your own private error type or types should implement this trait but nothing requires this in most contexts.