[issue22630] `concurrent.futures.Future.set_running_or_notify_cancel` does not notify cancel

[Ben Mather]

Ben Mather added the comment:

Have uploaded patch to re-implement `wait` and `as_completed` using callbacks.  See issue 22729.  Sorry for sitting on it for so long.

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Added file: http://bugs.python.org/file37017/non-magic-waiters.patch

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<http://bugs.python.org/issue22630>
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