元组可以在匹配中被析构如下：
fn main() {
let pair = (0, -2);
// TODO ^ Try different values for `pair`
println!("Tell me about {:?}", pair);
// Match can be used to destructure a tuple
match pair {
// Destructure the second
(0, y) => println!("First is `0` and `y` is `{:?}`", y),
(x, 0) => println!("`x` is `{:?}` and last is `0`", x),
_ => println!("It doesn't matter what they are"),
// `_` means don't bind the value to a variable
}
}
