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using System;
class Program
{
public delegate object D (int member);
private D _value;
private object M (int member)
{
return null;
}
void Test_1 ()
{
Delegate d1 = M + _value;
Delegate d2 = _value + M;
}
public bool Test_2 ()
{
return _value == M;
}
public bool Test_3 ()
{
return _value != M;
}
public bool Test_4 (D d)
{
return d == _value;
}
public static int Main ()
{
Program p = new Program ();
if (p.Test_2 ())
return 1;
p._value = p.M;
if (!p.Test_2 ())
return 2;
if (p.Test_3 ())
return 3;
Console.WriteLine ("OK");
return 0;
}
}
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