Rust 条件分支匹配

fn test_match(){
    let scores=80;
    match scores{
        x if x>=80 => println!("excellent"),
        x if x>=60 => println!("good"),
        _ => println!("bad")
    }
}
fn test_match_v2()->&'static str{
    let scores=80;
    match scores{
        80..100  => "excellent",
        60..80 => "good",
        _ => "bad"
    }
}