[issue20369] concurrent.futures.wait() blocks forever when given duplicate Futures

[Glenn Langford]

Glenn Langford added the comment:

Proposed patch...please treat with an appropriate level of suspicion since this is my first patch submission. :-)  

A corresponding change will be made to as_completed() for #20367. Suggestions welcome.

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keywords: +patch
Added file: http://bugs.python.org/file33665/issue20369.patch

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