Auto merge of #2505 - srinivasreddy:improve_msg, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 1 Apr 2016 17:56:49 +0000 (10:56 -0700)
committerbors <bors@rust-lang.org>
Fri, 1 Apr 2016 17:56:49 +0000 (10:56 -0700)
Create `Cargo.lock` if it does not exist.


Trivial merge