libstd: Add `Fn`/`FnMut`/`FnOnce` to the prelude.#16615

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pcwalton:unboxed-closures-prelude

Aug 20, 2014

Commits on Aug 19, 2014

libstd: Add `Fn`/`FnMut`/`FnOnce` to the prelude.
pcwalton
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