[issue20297] concurrent.futures.as_completed() installs waiters for already completed Futures

[Glenn Langford]

Changes by Glenn Langford <glenn.langford at gmail.com>:


Removed file: http://bugs.python.org/file33656/test_dupfuture.py

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20297>
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