Auto merge of #21605 - huonw:omg-muscle-memory, r=eddyb
I'm beginning to suspect it's impossible to avoid accidentally writing `#[deriving]` at least once in every program, and it results in non-intuitive error messages: "Foo doesn't have any method in scope `clone`" despite there being a `#[deriv...(Clone)]` attribute! Also, lots of documentation around the internet uses `#[deriving]` so providing this guidance is very helpful (lots of people ask in #rust about this error).
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