[issue22696] Add a function to know about interpreter shutdown

[STINNER Victor]

STINNER Victor added the comment:

> Before committing the patch it will be good to find places in the code which will benefit from this function.

The traceback and/or the linecache is a first good candidate to use this new function. We may patch more functions later if needed, I don't think that we need to address all issues right now.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22696>
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