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fn main() {
    let triple = (0, -2, 3);
    // 试一试 ^ 将不同的值赋给 `triple`

    println!("Tell me about {:?}", triple);
    // match 可以解构一个元组
    match triple {
        // 解构出第二个和第三个元素
        (0, y, z) => println!("First is `0`, `y` is {:?}, and `z` is {:?}", y, z),
        (1, ..)  => println!("First is `1` and the rest doesn't matter"),
        // `..` 可用来忽略元组的其余部分
        _      => println!("It doesn't matter what they are"),
        // `_` 表示不将值绑定到变量
    }
}
//Tell me about (0, -2, 3)
//First is `0`, `y` is -2, and `z` is 3