proc PyMember_GetOne(obj_addr: PyObject; l: PyMemberDef): PyObject {....raises: [],
    tags: [RootEffect], forbids: [].}

proc PyMember_SetOne(obj_addr: PyObject; l: PyMemberDef; v: PyObject): PyBaseErrorObject {.
    ...raises: [], tags: [RootEffect, WriteIOEffect], forbids: [].}