[issue21326] asyncio: request clearer error message when event loop closed

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7912179335cc by Victor Stinner in branch '3.4':
Issue #21326: Add a new is_closed() method to asyncio.BaseEventLoop
http://hg.python.org/cpython/rev/7912179335cc

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<http://bugs.python.org/issue21326>
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