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Trait impl show docs Fixes #51834. <img width="1440" alt="screen shot 2018-06-29 at 00 14 33" src="https://user-images.githubusercontent.com/3050060/42063323-6e6e8cc8-7b31-11e8-88ef-4dd2229df76c.png"> (You can see both commit changes in the screenshot 😄) r? @QuietMisdreavus