Giampaolo Rodola' <g.rod...@gmail.com> added the comment:

PR-17098 basically reverts https://bugs.python.org/issue33695. Not good. =) 
I think we can simply consume the iterator immediately as in:

    def copytree(src, ...):
        with os.scandir(src) as itr:
            entries = list(itr)
        return _copytree(entries=entries, ...)

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38688>
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