Auto merge of #2978 - matklad:opt-level, r=alexcrichton
authorbors <bors@rust-lang.org>
Tue, 9 Aug 2016 18:17:13 +0000 (11:17 -0700)
committerGitHub <noreply@github.com>
Tue, 9 Aug 2016 18:17:13 +0000 (11:17 -0700)
Gracefully handle errors in a lockfile

Closes #2715

Question: why internal errors are hidden by default? I think if the unexpected has happened you most likely want to know some details. See also #2756.


Trivial merge