Adding traceback can kill live exception #1907
Description
Calling PyObject_SetAttr() on the first usage of __Pyx_CLineForTraceback() can clear the current exception, thus leaving the exception handling path in an illegal state.
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Calling PyObject_SetAttr() on the first usage of __Pyx_CLineForTraceback() can clear the current exception, thus leaving the exception handling path in an illegal state.