fix an error about the static lifetime

[glacjay]

The reference should be x, not FOO itself.

[rust-highfive]

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 The way Github handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed.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

[alexcrichton]

@bors: r+ 2b6efbf rollup

[alexcrichton]

@glacjay we've got automation (we call @bors) which when we write "r+" will enqueue this PR for testing and merging, once all tests pass this will automatically be merged!

You can check out the queue here: http://buildbot.rust-lang.org/homu/queue/rust

[glacjay]

@alexcrichton Ah ha! That's COOL!