function Y(var outer)
{
    return (
        function(var func)
        {
            return outer(
                function(var arg)
                {
                    return func(func)(arg);
                }
            );
        }
    )(
        function(var func)
        {
            return outer(
                function(var arg)
                {
                    return func(func)(arg);
                }
            );
        }
    );
}

function factorial_recursive(int n)
{
    if(n == 0) return 1;
    else return n * factorial_recursive(n - 1);
}

function main()
{
    var factorial_y = function(var func)
    {
        return function(int n)
        {
            if(n == 0) return 1;
            else return n * func(n - 1);
        };
    };

    say("Recursive factorial gives: ", factorial_recursive(6));
    say("Y-Combinator factorial gives: ", Y(factorial_y)(6));
}