Interesting behaviour of a disposable struct

example1.cs

using System;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            Disposable d = new Disposable();

            try
            {
                Console.WriteLine(d.Disposed);
            }
            finally
            {
                ((IDisposable)d).Dispose();
            }

            using (d)
            {
                Console.WriteLine(d.Disposed);
            }

            Console.WriteLine(d.Disposed);
        }
    }

    struct Disposable : IDisposable
    {
        public bool Disposed { get; set; }

        public void Dispose()
        {
            Disposed = true;
        }
    }
}