6   template<typename T> using C = typename T::B;  typedef
7   template<typename T> struct D {  struct
8     template<typename U> using E = typename A<U>::template C<A<T>>;
9     template<typename U> using F = A<E<U>>;  typedef
10     template<typename U> using G = C<F<U>>;
11     G<T> g;
100   struct S {  struct
127   template<typename T, typename ...Ts> struct S {  struct
131     void f1(Y<T> a) { h(g(a)); } // expected-error {{undeclared identifier 'g'}}  in f1()
132     void f2(Y<Ts>...as) { h(g(as)...); } // expected-error {{undeclared identifier 'g'}}  in f2()
133     void f3(Y<Ts>...as) { g(as...); } // ok  in f3()
134     void f4(Ts ...ts) { h(g(sizeof(ts))...); } // expected-error {{undeclared identifier 'g'}}  in f4()
137     void f5(Ts ...ts) { g(sizeof(ts)...); } // ok  in f5()
143   template<int I> struct C {};  struct