libcore: add an EnumerateIterator, like Python's enumerate.#5927
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huonw wants to merge 1 commit intorust-lang:incomingfrom
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libcore: add an EnumerateIterator, like Python's `enumerate`.#5927huonw wants to merge 1 commit intorust-lang:incomingfrom
huonw wants to merge 1 commit intorust-lang:incomingfrom
