Implement the `Fn` trait for bare fn pointers in the compiler#19449

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nikomatsakis:unboxed-closure-fn-impl

Dec 4, 2014

Commits on Dec 4, 2014

Implement the `Fn` trait for bare fn pointers in the compiler rather than doing it using hard-coded impls. This means that it works also for more complex fn types involving bound regions. Fixes #19…
nikomatsakis
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Add a cache so we don't create so many shims.
nikomatsakis
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Adjust nits from pcwalton.
nikomatsakis
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