[issue21886] asyncio: Future.set_result() called on cancelled Future raises asyncio.futures.InvalidStateError

[STINNER Victor]

STINNER Victor added the comment:

In https://codereview.appspot.com/69870048/ Guido proposed to test to replace:
   self._loop.call_soon(waiter.set_result, None)
with:
   if not waiter.cancelled():
      waiter.set_result(None)

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