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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 690b6ddeee9c by Victor Stinner in branch 'default':
Issue #21326: Add asyncio.BaseEventLoop.is_closed() method
http://hg.python.org/cpython/rev/690b6ddeee9c

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nosy: +python-dev

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