gcc/testsuite/g++.dg/lookup/hidden-temp-class2.C

// Copyright (C) 2005 Free Software Foundation
// Contributed by Kriang Lerdsuwanakij <lerdsuwa@users.sourceforge.net>
// { dg-do compile }

class A {
  template <class T> friend class B;
};

class B* b;	// { dg-error "argument required|invalid" }