獲取通配符臂的值

Question

如何獲得match語句中通配符臂的值？

例如：

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

我希望的東西不是存儲enum在一個變量被匹配清潔：

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

Answer 1

這是你問什麼？

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