File: pr57543-1.C

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gcc-arm-none-eabi 15%3A7-2018-q2-5
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// DR 1227, PR c++/57543
// { dg-do compile { target c++11 } } 

template <class T> struct A { using X = typename T::X; };  // { dg-error "not a class" }
template <class T> typename T::X f(typename A<T>::X);
template <class T> void f(...) { }
template <class T> auto g(typename A<T>::X) -> typename T::X;  // { dg-message "required" }
template <class T> void g(...) { }

void h() {
  f<int>(0);  // OK
  g<int>(0);  // { dg-message "required" }
}