以下のものオブジェクトのオフセット分ずらしたところに-1を代入
/* from classobject.c */
{&PyInstance_Type, MFLAG_OFS(tp_call)},
{&PyMethod_Type, MFLAG_OFS(tp_call)},
/* from descrobject.c */
{&PyMethodDescr_Type, MFLAG_OFS(tp_call)},
{&PyClassMethodDescr_Type, MFLAG_OFS(tp_call)},
{&PyMethodWrapper_Type, MFLAG_OFS(tp_call)},
/* from funcobject.c */
{&PyFunction_Type, MFLAG_OFS(tp_call)},
/* from genobject.c */
{&PyGen_Type, MFLAG_OFS(tp_iternext)},
/* from methodobject.c */
{&PyCFunction_Type, MFLAG_OFS(tp_call)},
/* from channelobject.c */
{&PyChannel_TypePtr, MFLAG_OFS_IND(tp_iternext)},