Add correct use for Error and io

[lawrencewoodman]

This also repeats the case analysis used.

[rust-highfive]

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

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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[Manishearth]

r? @BurntSushi

[BurntSushi]

@bors r+

[bors]

📌 Commit ca1f0c9 has been approved by BurntSushi

[bors]

⌛ Testing commit ca1f0c9 with merge 7d80fb4...

[bors]

💔 Test failed - auto-linux-64-nopt-t

[Manishearth]

@bors retry rollup

[durka]

missing semicolon

[steveklabnik]

@bors: retry

[steveklabnik]

err actually new commit

@bors: r+ rollup

[bors]

📌 Commit 0ca33ad has been approved by steveklabnik