Auto merge of #2723 - alexcrichton:override-errors, r=wycats
authorbors <bors@rust-lang.org>
Fri, 20 May 2016 23:56:13 +0000 (16:56 -0700)
committerbors <bors@rust-lang.org>
Fri, 20 May 2016 23:56:13 +0000 (16:56 -0700)
Don't throw away errors with `-p` arguments

This was unfortunately ignoring errors which would helpfully tell you how to
rerun a command with a more precise specification.

Closes #2641


Trivial merge