Improve Error Handling chapter

[steveklabnik]

A long while back, @BurntSushi wrote http://blog.burntsushi.net/rust-error-handling/ . It is awesome, and deserves to be in the book in some form. Last we talked, @BurntSushi was okay with us using it from a licensing perspective.

[alexispurslane]

It looks to me like adding it to the book would require a major rewrite of it (The blog post) because it is written in a different style from the book (author talks about "I").

[BurntSushi]

Yes! How should we do this? The article is in markdown here: https://github.com/BurntSushi/blog/blob/master/content/post/rust-error-handling.md (Well, mostly markdown. There are a few custom constructs for my questionable attempt at making sure all code compiles.) They should be easy to lift out. Should I do that and submit an initial PR? Should it be a guide? (There is already guide-error-handling.md.)

[alexispurslane]

Maybe we could replace the error handling guide with @BurntSushi's article?

[alexispurslane]

It is a really awesome article. It would definitely be worth it to adapt it for the Rust book.

[steveklabnik]

Yes, that'd be the intention, basically, to replace the existing guide.

I wouldn't be opposed to "import wholesale, change from I to we", frankly. Can't say more, but I don't think extra editing is important at first. (should be able to say soon)

[alexispurslane]

Regex to the rescue!

[alexispurslane]

I'd be willing to do this.

[BurntSushi]

OK, I'm working on the initial PR now.

[alexispurslane]

Oh. I just finished doing it. Whoops.

[alexispurslane]

I put the pull request up at #28301.

[steveklabnik]

This was fixed with the merging of #28301