页面比较

        let (_x1, _x2,) = (1, 2,); // Test a trailing comma in the let binding
        let (_x1, _x2) = (1, 2); // Test a trailing comma in the let binding
        let (_x) = (1);
        let _x = (1);
        let _x = (1,);
// 用最新的 move cli，analyzer，这里所有表达式都是合法的，所有变量都被推导为u64类型