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Any reason you don't want to call set_next from set_get?
I would say
static PyObject *
set_get(PySetObject *so)
{
	register Py_ssize_t pos = 0;
	register setentry *entry;
 if (set_next(so, &pos, &entry)) {
 Py_INCREF(entry->key);
 return entry->key;
 }
 /* set appropriate error */
 return NULL;
}
BTW, what your patch is supposed to do on set().get()?
}