Hacker News Reader

Comment by WirelessGigabit | Hacker News Reader

Remember,

    std::result::Result<T, E>

does not restrict

    E: std::error:Err

Whereas the article doesn't say that this is the case, but it mentioned it in a way that confused me: https://www.shuttle.rs/blog/2022/06/30/error-handling#:~:tex....

View on HN

This is a general principal in the Rust standard library, but it is confusing at first. Similarly you can construct a HashMap without restriction but calling `.get` on it requires the key to implement Hash.

I'll let someone else clarify the reasoning because I'm not confident I remember it correctly. I though this was in the Rust API guidelines but I can't find it after a quick skin.

I couldn't find it in the API guidelines either. From what I understand, the idea is that any trait bounds, which includes generic type parameter bounds and lifetime bound on a type (struct or enum) would be repeated back in the impl block

there is a nice discussion on this issue here: https://github.com/rust-lang/rust-clippy/issues/1689

Reply on news.ycombinator.com