1 // PR c++/28559 2 // { dg-do compile { target c++11 } } 3 4 template<typename T> struct A 5 { 6 struct B; 7 }; 8 9 struct C 10 { 11 template<typename T> friend struct [[gnu::packed]] A<T>::B; // { dg-warning "uninstantiated" } 12 }; 13