Rust: From / Into

#[derive(Debug)]
struct MyNumber(i8);

impl From<i8> for MyNumber {
    fn from(i: i8) -> MyNumber {
        MyNumber(i)
    }
}

fn main() {
    let n = MyNumber::from(42);
    println!("From: {:?}", n);

    let nn: MyNumber = 5.into();
    println!("Into: {:?}", nn);
}