Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

Honestly I have no strong opinion.

Correct code should not be affected, if somebody want to handle task 
cancellation explicitly -- he already have `except CancelledError` in his code.

What are use cases for intentional catching Exception for task cancellation 
prevention?

Could we add a warning for this case without base exception class change? I 
don't see how to do it but maybe somebody has an idea?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32528>
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