fn main() {
      #[derive(Copy, Clone, PartialEq, Debug)]
    enum SearchDirection {
        Left = 0,
        Right,
    }
    impl From<u8> for SearchDirection {
        fn from(d: u8) -> Self {
            match d {
                1 => SearchDirection::Right,
                _ => SearchDirection::Left,
            }
        }
    }
    impl SearchDirection {
        const MAX: u8 = 2;
        pub fn flip(&mut self) -> Self {
            std::mem::replace(self, ((*self as u8 + 1) % Self::MAX).into())
        }
    }

    let mut search = SearchDirection::Left;
    for i in 0..10 {
        eprintln!("{:?}", search.flip());
    }
}