--- /dev/null
+// { dg-do compile }
+
+// 2007-02-04 Benjamin Kosnik <bkoz@redhat.com>
+//
+// Copyright (C) 2007, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <tr1/unordered_set>
+
+namespace std {
+namespace tr1 {
+
+ // [6.3.4.3] Class template unordered_set
+ template <class Value,
+ class Hash,
+ class Pred,
+ class Alloc>
+ class unordered_set;
+
+ // [6.3.4.5] Class template unordered_multiset
+ template <class Value,
+ class Hash,
+ class Pred,
+ class Alloc>
+ class unordered_multiset;
+
+ template <class Value, class Hash, class Pred, class Alloc>
+ void swap(unordered_set<Value, Hash, Pred, Alloc>& x,
+ unordered_set<Value, Hash, Pred, Alloc>& y);
+
+ template <class Value, class Hash, class Pred, class Alloc>
+ void swap(unordered_multiset<Value, Hash, Pred, Alloc>& x,
+ unordered_multiset<Value, Hash, Pred, Alloc>& y);
+
+} // namespace tr1
+} // namespace std
+