[issue22898] segfault during shutdown attempting to log ResourceWarning

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

out can be b'Done.\r\n'. Use self.assertIn.

> If both patches were to be included, the test case in warn_4.patch would test the above patch and not the changes made in Python/_warnings.c.

You can test err for warning message.

The traceback should be cleared before decrementing the reference count. And only if Py_REFCNT(v) is 2.

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<http://bugs.python.org/issue22898>
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