D>>class X
D>>{
D>>    template<class T> friend struct A;
D>>};

D>>template<class T>
D>>struct A{};
D>>

SK>template<class T> struct foo1;

SK>class foo {
SK>    friend struct foo1;
SK>    class A{
SK>    };
SK>};

SK>template <class T>
SK>struct foo1 {
SK>    foo::A a;
SK>};
SK>