gco2uv            131 lib/lua/ldo.c      gco2uv(up)->v = (gco2uv(up)->v - oldstack) + L->stack;
gco2uv             84 lib/lua/lgc.c        UpVal *uv = gco2uv(o);
gco2uv            382 lib/lua/lgc.c      case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;