rust-lang/rust — pull request #15929 by pcwalton (2014-07-23 19:45:31+00:00)
Title: librustc: Parse, but do not fully turn on, the `ref` keyword for

by-reference upvars.

This partially implements RFC 38. A snapshot will be needed to turn this
on, because stage0 cannot yet parse the keyword.

Part of #12381.

r? @alexcrichton