mark_m_tbl       4444 gc.c           	mark_m_tbl(objspace, RCLASS_M_TBL(obj));
mark_m_tbl       4453 gc.c           	    mark_m_tbl(objspace, RCLASS_M_TBL(obj));
mark_m_tbl       4456 gc.c           	mark_m_tbl(objspace, RCLASS_CALLABLE_M_TBL(obj));