using System;

public class Program

{

    private struct Test

    {

        public int X;

        public Program Program;

        public void Run()

        {

            if (X++ > 9)

                return;

            Program.theTest = new Test { X = this.X, Program = this.Program };

            Program.theTest.Run();

            Console.WriteLine(X.ToString());

        }

    }

    Test theTest;

    public static void Main()

    {

        var program = new Program();

        program.theTest.Program = program;

        program.theTest.Run();

    }

}