static void Main(string[] args)
{
IList <int> l = new Node <int>(1, new Node <int>(3, new Empty <int>()));
IElementVisitor <int, int> test =;
while (l.IsEmpty() == false)
{
Console.Out.WriteLine(l.Visit <int>(test));
l = l.Tail();
}
Console.ReadKey();
}
public U Visit <U>(IElementVisitor <T, U> ev)
{
return(ev.OnSome(value));
}
public U Visit <U>(IElementVisitor <T, U> ev)
{
return(default(U));
}