16PyObject *pyrna_callback_add(
BPy_StructRNA *self, PyObject *args);
17PyObject *pyrna_callback_remove(
BPy_StructRNA *self, PyObject *args);
PyObject * pyrna_callback_classmethod_remove(PyObject *, PyObject *args)
PyObject * pyrna_callback_classmethod_add(PyObject *, PyObject *args)