Auto merge of #2881 - matklad:lazy-rustc-info, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 15 Jul 2016 19:39:58 +0000 (12:39 -0700)
committerGitHub <noreply@github.com>
Fri, 15 Jul 2016 19:39:58 +0000 (12:39 -0700)
Lazy rustc info

This is the first step towards https://github.com/rust-lang/cargo/issues/2848.


Trivial merge