Auto merge of #2862 - alexcrichton:update-rust, r=alexcrichton
authorbors <bors@rust-lang.org>
Tue, 12 Jul 2016 16:53:17 +0000 (09:53 -0700)
committerGitHub <noreply@github.com>
Tue, 12 Jul 2016 16:53:17 +0000 (09:53 -0700)
Update the rust nightly to build cargo nightlies

Right now Cargo doesn't work on OSX 10.12, but the fix is in upstream rustc, so
let's pick that up and make Cargo nightlies compatible as well.


Trivial merge