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C#
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using System;
using System.Collections.Generic;
interface I<T> : I2<T>, IEnumerable<T>
{
}
interface I2<T2>
{
void Foo<U> (IEnumerable<U> list) where U : T2;
}
class Impl<T> : I<T>
{
public void Foo<U> (IEnumerable<U> list) where U : T
{
}
public IEnumerator<T> GetEnumerator ()
{
return null;
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
{
return null;
}
}
class A<K>
{
public I<K> Value = new Impl<K> ();
}
class Test<TT> : A<TT>
{
public void Foo ()
{
var a = new Test<TT> ();
a.Value.Foo (Value);
}
}
class M
{
public static void Main ()
{
new Test<ulong> ().Foo ();
}
}