|  | @@ -329,7 +329,8 @@ class _RequestIterator(object):
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				|  |  |              request = self._state.request
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				|  |  |              self._state.request = None
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				|  |  |              return request
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				|  |  | -        raise Exception('gRPC Error: Invalid _state')
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				|  |  | +
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				|  |  | +        raise AssertionError()  # should never run
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				|  |  |  
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				|  |  |      def _next(self):
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				|  |  |          with self._state.condition:
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