1// PR c++/19498
2// Origin: Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
3// { dg-do compile }
4
5template<typename T> struct A
6{
7    template<T&> struct B;  // { dg-error "reference to void" }
8};
9
10A<void> a;                  // { dg-message "required" }
11