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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 58b0f3e1ddf8 by Guido van Rossum in branch 'default':
Fix issue #20367: concurrent.futures.as_completed() for duplicate arguments.
http://hg.python.org/cpython/rev/58b0f3e1ddf8

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nosy: +python-dev

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