For this exercise check out the sections: - [Error Handling](https://doc.rust-lang.org/book/ch09-02-recoverable-errors-with-result.html) - [Generics](https://doc.rust-lang.org/book/ch10-01-syntax.html) of the Rust Book. or alternatively, check out the sections: - [Result](https://doc.rust-lang.org/rust-by-example/error/result.html) - [Boxing errors](https://doc.rust-lang.org/rust-by-example/error/multiple_error_types/boxing_errors.html) of the Rust By Example Book.