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using System;
interface IIn<in T>
{
}
interface IOut<out T>
{
}
class A<T> : IIn<T>, IOut<T>
{
}
class C
{
public static int Main ()
{
IIn<string> a_string = new A<string> ();
IIn<object> a_object = new A<object> ();
if (!(a_string is IIn<string>))
return 1;
if ((a_string is IIn<object>))
return 2;
if (!(a_object is IIn<string>))
return 3;
if (!(a_object is IIn<object>))
return 4;
IOut<string> b_string = new A<string> ();
IOut<object> b_object = new A<object> ();
if (!(b_string is IOut<string>))
return 10;
if (!(b_string is IOut<object>))
return 11;
if (b_object is IOut<string>)
return 12;
if (!(b_object is IOut<object>))
return 13;
Console.WriteLine ("OK");
return 0;
}
}
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