1 // PR c++/56971 2 3 template <typename T> 4 class rp { 5 }; 6 7 template <template <typename> class P> 8 struct b { 9 template <class, template <typename> class FriendP> 10 friend void f(b<FriendP> from); 11 }; 12 13 template <class, template <typename> class P> f(b<P> from)14void f(b<P> from) { 15 } 16 main()17int main() { 18 b<rp> v; 19 f<int>(v); 20 return 0; 21 } 22