Warn by default when encountering a statement which only consists of an equality comparison#1812

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crumblingstatue wants to merge 5 commits intorust-lang:masterfrom crumblingstatue:master

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Commits on Dec 7, 2016

Commits on Dec 8, 2016

Commits on Dec 14, 2016

Reword statement about no_effect and false positives
crumblingstatue
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