OP_UNM
int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
codearith(fs, OP_UNM, e, &e2, line);
case OP_UNM: tm = TM_UNM; break;
case OP_MOD: case OP_POW: case OP_UNM: case OP_LEN:
vmcase(OP_UNM,