namespace A
{
    interface IFoo
    {
         Hello (_foo : IFoo) : void;
    }
}

namespace B
{
  partial class Test [T] : IDoo, A.IFoo where T : A.IFoo
    { }
}

namespace B
{
    using A;

    partial class Test [T] : Y, IFoo where T : IFoo
    {
         IFoo_Hello (_foo : IFoo) : void implements IFoo.Hello
        { }
    }
}

interface IDoo { }

class Y { }

class X
{
    static Main () :  void
    { }
}
/*
BEGIN-OUTPUT
END-OUTPUT
*/