[issue2507] Exception state lives too long in 3.0

[Jeffrey Yasskin]

Jeffrey Yasskin <jyasskin at gmail.com> added the comment:

Thanks for the patch. This isn't specific to threads at all, so the test
doesn't need to spawn a thread, just raise an exception from a nested
function with a parameter, catch it, delete the object the parameter
referred to, and then check that the object has been destroyed.

I don't know the exception handling code very well, so I'd like someone
more familiar with it to check that the patch is correct and efficient.
Collin, would you do the honors?

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assignee:  -> collinwinter
nosy: +collinwinter

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