From: bors <bors@rust-lang.org>
Date: Fri, 29 Sep 2017 13:07:13 +0000 (+0000)
Subject: Auto merge of #4546 - derekdreery:add_docs, r=matklad
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Auto merge of #4546 - derekdreery:add_docs, r=matklad

Add some docs

I was reading around the source, trying to understand it, and writing docs to help myself. I thought they may be useful for the main crate.
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7da5c847776913c3a499d62753903b9ae8451639