using System;

​

public struct Wrapper<T>

{

    public T GetValue() { return default(T); }

}

​

public struct Bar

{

    private readonly Wrapper<Foo> _foo;

}

​

public struct Foo

{

    private readonly Wrapper<Bar> _bar;

}

​

public class Program

{

    public static void Main()

    {

        var t = new Bar();

    }

}