743 static PyObject* 
744 _convert2(ImagingObject* self, PyObject* args)
745 {
746     ImagingObject* imagep1;
747     ImagingObject* imagep2;
748     if (!PyArg_ParseTuple(args, "O!O!",
when PyArg_ParseTuple() succeeds
taking False path
749 			  &Imaging_Type, &imagep1,
750 			  &Imaging_Type, &imagep2))
751 	return NULL;
752 
753     if (!ImagingConvert2(imagep1->image, imagep2->image))
when treating unknown struct ImagingMemoryInstance * from _imaging.c:753 as NULL
taking True path
754         return NULL;
755 
756     Py_INCREF(Py_None);
757     return Py_None;
758 }
returning (PyObject*)NULL without setting an exception