In asyncio.locks.Lock.acquire(): Avoid deadlock when a cancelled future is in self._waiters.
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@ -166,7 +166,7 @@ class Lock(_ContextManagerMixin):
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This method blocks until the lock is unlocked, then sets it to
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locked and returns True.
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"""
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if not self._waiters and not self._locked:
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if not self._locked and all(w.cancelled() for w in self._waiters):
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self._locked = True
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return True
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