data List a = Cons a (List a)
              | Nil
              defining Show

*Main> Cons 0 Nil
Cons 0 Nil
*Main> Cons 1 it
Cons 1 (Cons 0 Nil)
*Main>

List a

List a

List a

List a

List a

List a

class List<A>
{
}

class Nil<A> : List<A>
{
    public Nil() {}
}

class Cons<A> : List<A>
{
    public A Head;
    public List<A> Tail;

    public Cons(A head, List<A> tail)
    {
        this.Head = head;
        this.Tail = tail;
    }
}

Cons a (List a)

Cons { headL :: a, tailL :: List a }

Cons a (List a)