re PR c++/68170 (Declaring friend template class template in C++1z produces…

re PR c++/68170 (Declaring friend template class template in C++1z produces error: specialization of ‘template<class T> class A’ must appear at namespace)

	PR c++/68170
	* pt.c (maybe_new_partial_specialization): The injected-class-name
	is not a new partial specialization.

From-SVN: r231380

gcc/cp/ChangeLog

 2015-12-07  Jason Merrill  <jason@redhat.com>
 
+	PR c++/68170
+	* pt.c (maybe_new_partial_specialization): The injected-class-name
+	is not a new partial specialization.
+
 	* Make-lang.in (check-c++1z, check-c++-all): Use GXX_TESTSUITE_STDS.
 
 2015-12-06  Jason Merrill  <jason@redhat.com>

gcc/cp/pt.c

@@ -855,6 +855,10 @@ maybe_new_partial_specialization (tree type)
       if (!current_template_parms)
         return NULL_TREE;
 
+      // The injected-class-name is not a new partial specialization.
+      if (DECL_SELF_REFERENCE_P (TYPE_NAME (type)))
+	return NULL_TREE;
+
       // If the constraints are not the same as those of the primary
       // then, we can probably create a new specialization.
       tree type_constr = current_template_constraints ();

gcc/testsuite/g++.dg/template/friend60.C

+// PR c++/68170
+
+template< typename T >
+class A
+{
+};
+
+template<>
+class A< void >
+{
+  template< typename X >
+  friend class A;
+};