wildcard - 获取通配符 arm 的值

Question

如何在 match 语句中获取通配符臂的值？

例如:

let a = 1i;
let b = 2i;
match a.cmp(&b) {
    Greater => println!("is greater"),
    _ => println!("is {}", _) // error: unexpected token: `_`
}

我希望有比将匹配的 enum 存储在变量中更干净的东西:

let a = 1i;
let b = 2i;
let ord = a.cmp(&b);
match ord {
    Greater => println!("is greater"),
    _ => println!("is {}", ord)
}

Answer 1

这就是你要的吗？

let a = 1i;
let b = 2i;
match a.cmp(&b) {
    Greater => println!("is greater"),
    e => println!("is {}", e)
}