#[derive(Debug)]
enum Foo {
    A,
    B,
    C
}

impl Foo {
    fn testing(&self) -> u8 {
        match self {
            Foo::A => 0,
            Foo::B => 1,
            Foo::C => 2,
        }
    }
}

fn main() {
    let bar = Foo::A;

    println!("{:?}", bar.testing());
}