Auto merge of #5192 - matklad:hash-set-all-the-way-down, r=alexcrichton
authorbors <bors@rust-lang.org>
Fri, 16 Mar 2018 16:06:28 +0000 (16:06 +0000)
committerbors <bors@rust-lang.org>
Fri, 16 Mar 2018 16:06:28 +0000 (16:06 +0000)
Avoid intermediate vector

Just a microoptimization to avoid intermediate `Vec`


Trivial merge