Auto merge of #4359 - sid0:debug, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 4 Aug 2017 03:52:35 +0000 (03:52 +0000)
committerbors <bors@rust-lang.org>
Fri, 4 Aug 2017 03:52:35 +0000 (03:52 +0000)
derive Debug for more data structures

This makes it easier for wrappers around Cargo to inspect the contents
of these data structures.


Trivial merge