STINNER Victor <vstin...@python.org> added the comment:

It makes sense to call _PyErr_WriteUnraisableMsg() when sys.excepthook raise a 
new exception. Do you want to propose a PR for that?

sys.excepthook documentation mentions sys.unraisablehook:
https://docs.python.org/dev/library/sys.html#sys.excepthook

threading._make_invoke_excepthook logs threading.excepthook failure using 
sys.excepthook.

Note: Carl also suggested to add a way to invoke sys.unraisablehook explicitly, 
not only for testing purpose. It would help in some cases.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43148>
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