[issue28448] C implemented Future doesn't work on Windows

[INADA Naoki]

INADA Naoki added the comment:

> I'm not so sure about this.  Maybe we can just fix _WaitCancelFuture somehow?

@haypo, do you know why _WaitCancelFuture overrides _schedule_callbacks() instead
of self.add_done_callback(self._unregister_wait_cb)?
_unregister_wait_cb must be called after all callbacks are called?

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nosy: +haypo

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<http://bugs.python.org/issue28448>
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