68 static PyObject *
69 TreeSet_update(BTree *self, PyObject *args)
70 {
71     PyObject *seq = NULL;
72     int n = 0;
73 
74     if (!PyArg_ParseTuple(args, "|O:update", &seq))
when PyArg_ParseTuple() succeeds
taking False path
75 	return NULL;
76 
77     if (seq) {
taking True path
78 	n = _TreeSet_update(self, seq);
79 	if (n < 0)
when considering range: -0x80000000 <= value <= -1
taking True path
80 	    return NULL;
81     }
82 
83     return PyInt_FromLong(n);
84 }
returning (PyObject*)NULL without setting an exception