Use struct variant instead of long, commented tuple

[tanadeau]

Minor code cleanup for readability and usability for Method enum.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @huonw (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. The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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.

Please see CONTRIBUTING.md for more information.

[tanadeau]

It looks like the Travis CI Linux builds are hanging. See also #1308.

[alexcrichton]

@bors: r+ 3f57587

Thanks!

[bors]

⌛ Testing commit 3f57587 with merge 5fb2f33...

[bors]

💔 Test failed - cargo-win-32

[alexcrichton]

@bors: retry

[bors]

⌛ Testing commit 3f57587 with merge e7393a0...

[bors]

☀️ Test successful - cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-32, cargo-win-64