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|�� 0 dS )a� Wait for the single Future or coroutine to complete, with timeout.
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z_GatheringFuture.cancel)N)rv rw rx ry r= rc r| r" r" rO r# r� � s r� F�r! �return_exceptionsc G s( | durt jdtdd� t|| |d��S )a� Return a future aggregating results from the given coroutines/futures.
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