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 |
| } |
| } |
