From: bors <bors@rust-lang.org>
Date: Fri, 10 Feb 2017 22:12:37 +0000 (+0000)
Subject: Auto merge of #3667 - jbendig:required_features, r=alexcrichton
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Auto merge of #3667 - jbendig:required_features, r=alexcrichton

Added required_features for issue #1570.

Based on PR #2056 by @tsurai and PR #2325 by @JanLikar

I tried to fix most everything that was talked about in the previous pull requests. Docs still need to be updated though.
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1b39da70af1a7db3b19ac8b6cceb22f2eda43a2c