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using System;
public abstract class A<T>
{
public abstract G Foo<G> () where G : T;
public virtual G Foo2<G> () where G : T
{
return default (G);
}
}
public class B : A<int?>
{
public override G Foo<G> ()
{
return new G ();
}
public override G Foo2<G> ()
{
return base.Foo2<G> ();
}
}
abstract class A2<T>
{
public abstract void Foo<U> () where U : struct, T;
}
class B2 : A2<System.ValueType>
{
public override void Foo<Y> ()
{
}
}
abstract class A3<T>
{
public abstract void Foo<U> () where U : class, T;
}
class B3 : A3<System.Object>
{
public override void Foo<Y> ()
{
}
}
class Program
{
public static int Main ()
{
var b = new B ();
if (b.Foo<int?> () == null)
return 0;
b.Foo2<int?> ();
var b2 = new B2 ();
b2.Foo<byte> ();
var b3 = new B3 ();
b3.Foo<string> ();
return 1;
}
}
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