[issue21163] asyncio doesn't warn if a task is destroyed during its execution

[Marco Paolini]

Marco Paolini added the comment:

Sorry for keeping this alive.

Take a look at the `wait_for.py` just submitted in the unrelated #22448: no strong refs to the tasks are kept. Tasks remain alive only because they are timers and the event loop keeps strong ref.

Do you think my proposed patch is OK? Sould I open a new issue?

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<http://bugs.python.org/issue21163>
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