173     def cancel(self):  member in Task
197             if self._fut_waiter.cancel():
234             super().cancel()  # I.e., Future.cancel(self).
262                             if self._fut_waiter.cancel():
396         fut.cancel()
412             fut.cancel()
425         timeout_handle.cancel()
448                 timeout_handle.cancel()
459             timeout_handle.cancel()
479         fut.cancel()
526             timeout_handle.cancel()
570         h.cancel()
619     def cancel(self):  member in _GatheringFuture
624             if child.cancel():
784             outer.cancel()