bpo-36829: PyErr_WriteUnraisable() normalizes exception #13507
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PyErr_WriteUnraisable() now creates a traceback object if there is no current traceback. Moreover, call PyErr_NormalizeException() and PyException_SetTraceback() to normalize the exception value. Ignore any error.
Replace runtime check with assertions. _PyTraceBack_FromFrame() is used by PyTraceBack_Here() which is performance critical (called from ceval.c).
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PyErr_WriteUnraisable() now creates a traceback object if there is no
current traceback. Moreover, call PyErr_NormalizeException() and
PyException_SetTraceback() to normalize the exception value.
https://bugs.python.org/issue36829