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58: Use for_each in map Extend and FromIterator r=Amanieu a=cuviper
Using `for_each` allows internal iteration, which can have better
performance for some iterators. For instance, `Chain` and `FlatMap` have
to check their state every time `next()` is called, but when folding
they can just forward to their inner iterators.
Co-authored-by: Josh Stone <[email protected]>
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