Why does std::io::Read::bytes() iterate over Result<u8, _> instead of just u8? And how to implement a scanner that returns Err immediately on an Err?

• competitive-programming-rs

  2 255 2.0 Rust

  Algorithm Snippets for Competitive Programming in Rust

I have this question because, as practice, I'm trying to implement a struct Scanner based on this repo, and as an extra, I'd like to be able to handle errors instead of just panicking. However, unlike map(), the skip_while() and take_while() won't handle errors. If the Errs wouldn't happen unless in situations when the program were going very wrong, then I could just panic. Alternatively, is there a way to break and just return an error once bytes() gives an Err, with just iterator function chaining and without having to write loops myself?

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