Auto merge of #7428 - Wafflespeanut:tidy, r=Ms2ger
Auto merge of #7428 - Wafflespeanut:tidy, r=Ms2ger

tidy will now show its expectation of uses!

closes #7427

(pretty errors "inherited" from rust's type checker) :P

![screenshot](https://cloud.githubusercontent.com/assets/6691262/9543298/8cabfdaa-4d95-11e5-9101-14e62781e74e.png)

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