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using System;
public class A
{
public static int Counter;
public static implicit operator string (A c)
{
++Counter;
return "A-class";
}
public static implicit operator Delegate (A c)
{
return null;
}
}
public struct B
{
public static int Counter;
public static implicit operator string (B c)
{
++Counter;
return "B-struct";
}
}
public struct D
{
public static int Counter;
public static implicit operator Delegate (D d)
{
++Counter;
return null;
}
}
public struct E
{
public static int Counter;
public static implicit operator bool (E d)
{
++Counter;
return true;
}
}
public class F
{
public static implicit operator bool (F f)
{
throw new ApplicationException ();
}
}
class Program
{
public static int Main ()
{
if (new B () != new B () || B.Counter != 2)
return 1;
if (new B () != "B-struct" || B.Counter != 3)
return 2;
if (new B () == null || B.Counter != 4) {
// FIXME: Incorrect null lifting
//return 3;
}
if (new D () != new D () || D.Counter != 2)
return 10;
if (new D () != null || D.Counter != 3) {
// FIXME: Incorrect null lifting
//return 11;
}
if (new A () != "A-class" || A.Counter != 1)
return 20;
if (new A () == null || A.Counter != 1)
return 21;
if (new E () != new E () || E.Counter != 2)
return 31;
if (new F () == new F ())
return 40;
Console.WriteLine ("ok");
return 0;
}
}
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