gistfile1.rs

enum List {
    Cons(int, ~List),
    Nil
}

impl List {
    fn prepend(~self, x : int) -> ~List {
        ~Cons(x, self)
    }
}

fn main() {
    let mut li = ~Cons(2, ~Nil);
    li = li.prepend(1);
    println!("{:?}", li);
}