mozilla/rust — pull request #5672 by steveklabnik (2013-04-01 23:38:47+00:00)
Title: Improve io docs

When I submitted #5659, it apparently caused some test failures. Then, because I left it in my incoming rather than making a new branch, I deleted my commit.

Let's try this again, this time, with its own branch so that I don't screw it up.

r?