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

[Glenn Langford]

Glenn Langford added the comment:

Updated patch with a test case, and added a minor note to the docstring to clarify behaviour.

The use of sleep() in the test is not great, but it is the most obvious way to test and it is consistent with the approach used in other concurrent test cases.

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Added file: http://bugs.python.org/file33708/issue20369.patch

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