--- /dev/null
+// { dg-do compile }
+
+// 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 <istream>
+
+namespace std {
+ template <class charT, class traits >
+ class basic_istream;
+ typedef basic_istream<char> istream;
+ typedef basic_istream<wchar_t> wistream;
+ template <class charT, class traits >
+ class basic_iostream;
+ typedef basic_iostream<char> iostream;
+ typedef basic_iostream<wchar_t> wiostream;
+ template <class charT, class traits>
+ basic_istream<charT,traits>& ws(basic_istream<charT,traits>& is);
+}