#![allow(unused_variables)]
fn main() {
    #[allow(dead_code)]
    #[derive(Debug)]
    enum List<T> {
        Cons(T, Box<List<T>>),
        Nil,
    }
    let list: List<i32> = List::Cons(1, Box::new(List::Cons(2, Box::new(List::Nil))));
    println!("{list:?}");
}