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using System;
struct MyTypeA
{
short b;
public MyTypeA (short b)
{
this.b = b;
}
public static MyTypeA operator + (MyTypeA a, MyTypeA b)
{
throw new NotSupportedException ();
}
public static bool operator == (MyTypeA a, MyTypeA b)
{
return true;
}
public static bool operator != (MyTypeA a, MyTypeA b)
{
throw new NotSupportedException ();
}
public static bool operator > (MyTypeA a, MyTypeA b)
{
throw new NotSupportedException ();
}
public static bool operator < (MyTypeA a, MyTypeA b)
{
throw new NotSupportedException ();
}
}
struct MyTypeB
{
short b;
public MyTypeB (short b)
{
this.b = b;
}
public static MyTypeB operator + (MyTypeB a, MyTypeB b)
{
return a;
}
public static bool operator == (MyTypeB a, MyTypeB b)
{
return true;
}
public static bool operator != (MyTypeB a, MyTypeB b)
{
return false;
}
public static bool operator > (MyTypeB a, MyTypeB b)
{
return false;
}
public static bool operator < (MyTypeB a, MyTypeB b)
{
return true;
}
public static MyTypeB operator & (MyTypeB a, MyTypeB b)
{
return a;
}
}
class C
{
public static int Main ()
{
MyTypeA? mt = null;
mt = null + mt;
MyTypeA? mt2 = null;
mt2 = mt2 + null;
bool b = mt2 > null;
bool x = mt2 == null;
MyTypeB? bt = null;
bt = bt + bt;
if (bt != null)
return 2;
MyTypeB? b2 = null;
bool bb = b2 == b2;
if (!bb)
return 3;
MyTypeB? b3 = null;
b3 = b3 & b3;
return 0;
}
}
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