re PR c++/57831 (pointer to member function inaccessible through using statement (or ICE))

	PR c++/57831
	* pt.c (tsubst_copy): Handle USING_DECL.

From-SVN: r200839

gcc/cp/ChangeLog

+2013-07-09  Jason Merrill  <jason@redhat.com>
+
+	PR c++/57831
+	* pt.c (tsubst_copy): Handle USING_DECL.
+
 2013-07-09  Marc Glisse  <marc.glisse@inria.fr>
 
 	PR c++/53094

gcc/cp/pt.c

@@ -12552,6 +12552,9 @@ tsubst_copy (tree t, tree args, tsubst_flags_t complain, tree in_decl)
     case TYPE_DECL:
       return tsubst (t, args, complain, in_decl);
 
+    case USING_DECL:
+      t = DECL_NAME (t);
+      /* Fall through.  */
     case IDENTIFIER_NODE:
       if (IDENTIFIER_TYPENAME_P (t))
 	{

gcc/testsuite/g++.dg/template/using23.C

+// PR c++/57831
+
+struct A {
+  void f();
+};
+template <class T> struct B : T {
+  typedef T base;
+  using base::f;         // If I write "using B<T>::f" it's ok
+  void g( ) {
+    B<T>::f();           // This is OK as expected
+    (this->*&T::f)();    // This is also OK
+    (this->*&B<T>::f)(); // This causes error
+  }
+};
+template struct B< A >;