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

[STINNER Victor]

STINNER Victor added the comment:

I fixed the issue in Python 3.5 by adding a new BaseEventLoop.is_closed() method. Calling run_forever() or run_until_complete() now raises an error.

I don't know yet if this issue should be fixed in Python 3.4. If it should be fixed, I don't know how it should be fixed. Guido was unhappy with subclasses of BaseEventLoop accessing the private attribute BaseEventLoop._closed in the review of my patch.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21326>
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