_
通配符, 如果我们只想关心1,3,5,7, 其他的通过通配符来解决
let some_u8_value = 0u8; match some_u8_value {
1 => println!("one"),
3 => println!("three"),
5 => println!("five"),
7 => println!("seven"),
_ => (),
}
if let
let some_u8_value = Some(0u8);
if let Some(3) = some_u8_value {
println!("three");
}
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