// PR c++/14912 // Bug: We were instantiating A<B> in order to compare it to the matching // argument for C<B,B>, which fails. template <class T> struct A { typedef typename T::F F; }; struct B { }; template <class T, class U = typename A<T>::F > struct C { typename T::F f; // { dg-error "no type" } }; C<B, B> c; // { dg-message "instantiated" }