use crate::List::{Cons, Nil};
use std::rc::Rc;

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

	let mut list = the_list;
	while let Cons(n, ref l) = *list.clone() {
		println!("{}", n);
		list = Rc::clone(&l);
	}
}

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