[issue30400] Race condition in shutil.copyfile()

[Zachary Ware]

Zachary Ware <zachary.ware at gmail.com> added the comment:

This can only be accepted into 3.8 at this point due to the new exception type.

The patch looks fairly straightforward; would it be possible to add a test that hits the new raise condition?

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nosy: +zach.ware
stage:  -> patch review
versions: +Python 3.8 -Python 2.7, Python 3.7

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