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Misc/NEWS.d/next/Library/2019-09-11-21-38-41.bpo-34037.LIAS_3.rst

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+For :mod:`asyncio`, add a new coroutine :meth:`loop.shutdown_default_executor`.
+The new coroutine provides an API to schedule an executor shutdown that waits
+on the threadpool to finish closing. Also, :func:`asyncio.run` has been updated
+to utilize the new coroutine.