Uppercase errors in std::io::fs

[globin]

No description provided.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @aturon (or someone else) soon.

[aturon]

@globin Thanks for the PR!

I think in general our errors are not very consistent about casing, but I believe that fully lower case is the norm. @alexcrichton can you confirm?

In any case, it would be worthwhile creating an explicit convention about this. Are you interested in writing an RFC to set up such a convention? I'd be happy to help.

[alexcrichton]

For the compiler itself at least we have a convention that all errors are entirely lower-case. I don't think we have a hard-and-fast rule about library errors, and I imagine you'll find any number of strategies throughout! That being said, I agree with @aturon that we should probably standardize on this, and standardizing on all lower-case seems ok to do!

[aturon]

I've now proposed an explicit convention for lower-case errors. I'm going to close this PR for now; feel free to comment on the RFC if you feel the convention should be different, however.