parse.y:4670
static NODE *
call_op(recv, id, narg, arg1)
    NODE *recv;
    ID id;
    int narg;
    NODE *arg1;
{
    value_expr(recv);
    if (narg == 1) {
	value_expr(arg1);
	arg1 = NEW_LIST(arg1);
    }
    else {
	arg1 = 0;
    }
    return NEW_CALL(recv, id, arg1);
}
