Rust Book Guessing Game Refers To Incorrect Option Type

[trishume]

The guessing game section of the Rust book has the line:

let input_num: Result<u32, _> = input.parse();

but multiple places nearby refer to unwrapping it with .ok() to produce an Option, which is never actually done in the code examples. It seems someone updated the code to directly use the Result<u32,_> and didn't update the surrounding text and the type error message.

This should be an easy fix but at the moment I'm a Rust newbie and I don't have a rust compiler to determine the correct type and error message.

[djmally]

I'll take a look into this. I'm a bit of a Rust newbie myself, but this seems like a pretty easy fix and I do have the tools available.

[djmally]

Submitted a PR for this as #22911.

[teotwaki]

@trishume Can this be closed? @djmally's fix has been applied to the documentation.