1 // PR c++/64398 2 // { dg-do compile { target c++11 } } 3 4 template<typename T> struct template1; 5 6 template<typename T, typename> // second param required 7 struct struct1{ 8 using type1 = decltype(T::x); 9 using type2 = template1<type1>; 10 }; 11 12 template<typename T> using alias1 = template1<decltype(T::x)>; 13 14 // just for instantiation: 15 template<typename T> using alias2 = alias1<T>; 16