[issue20367] concurrent.futures.as_completed() fails when given duplicate Futures

[Guido van Rossum]

Guido van Rossum added the comment:

LGTM. But you also need to update Doc/library/concurrent.futures.rst

I see this as a bugfix so it's not necessary to get this in before the beta 3 release tonight.

I will work on an asyncio patch and test.

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<http://bugs.python.org/issue20367>
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