1841 static PyObject *
1842 BTree_addUnique(BTree *self, PyObject *args)
1843 {
1844   int grew;
1845   PyObject *key, *v;
1846 
1847   UNLESS (PyArg_ParseTuple(args, "OO", &key, &v)) return NULL;
when PyArg_ParseTuple() succeeds
taking False path
1848 
1849   if ((grew=_BTree_set(self, key, v, 1, 0)) < 0) return NULL;
when considering range: -0x80000000 <= value <= -1
taking True path
1850   return PyInt_FromLong(grew);
1851 }
returning (PyObject*)NULL without setting an exception