Auto merge of #5309 - alexcrichton:beta-next, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 6 Apr 2018 21:29:30 +0000 (21:29 +0000)
committerbors <bors@rust-lang.org>
Fri, 6 Apr 2018 21:29:30 +0000 (21:29 +0000)
[beta] Fix another issue of poisoning too eagerly

Backport of https://github.com/rust-lang/cargo/pull/5307


Trivial merge