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Specialize methods on iter::Cloned<I> where I::Item: Copy. #39022

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Specialize methods on iter::Cloned<I> where I::Item: Copy. #39022

wants to merge 1 commit into from

Commits on Jan 12, 2017

  1. Specialize methods on iter::Cloned<I> where I::Item: Copy. 

    Instead of cloning a bunch of copyable types only to drop them (in `nth`,
`last`, and `count`), take advantage of rust-lang#1521 (Copy clone semantics) and don't
bother cloning them in the first place (directly call `nth`, `last`, and `count`
on the wrapped iterator). If the wrapped iterator optimizes these methods,
`Cloned` now inherits this optimization.
    @Stebalien
    Stebalien committed Jan 12, 2017
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