using System;

public class Program

{

    public static void Main()

    {

        Test a = new Test() { A = 42 };

        Test b = new Test() { A = 43 };

        b.A = 42;

        Console.WriteLine(a == b);//True

        ITest ia = (ITest)a;

        ITest ib = (ITest)b;

        Console.WriteLine(ia == ib);//False

        object oa = (object)a;

        object ob = (object)b;

        Console.WriteLine(oa == ob);//False

    }

    public struct Test : ITest 

    {   

        public int A { get; set; }

        public static bool operator == (Test x, Test y) 

        {

            return x.A == y.A;

        } 

        public static bool operator != (Test x, Test y)

        {

            return x.A != y.A;

        }

    }

    public interface ITest 

    {

    }

}