use crate::List::{Cons, Nil};

fn main() {
    let the_list = Cons(1, Box::new(Cons(2, Box::new(Cons(3, Box::new(Nil))))));
	println!("{:?}", the_list);

	let mut list = the_list;
	while let Cons(n, l) = list {
		println!("{}", n);
		list = *l;
	}
}

#[derive(Debug)]
enum List<T> {
    Cons(T, Box<List<T>>),
    Nil,
}