using System;

​

class Program {

    static void Main() {

        Action closure = Test();

        closure();

        closure();

    }

    static Action Test() {

        Closure local = new Closure();

        local.counter = 0;

        return local.Function;

    }

}

//gerado pelo compilador

class Closure {

    public int counter;

    public void Function() => Console.WriteLine(counter++);

}