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diff --git a/libstdc++-v3/testsuite/tr1/6_containers/unordered_set/requirements/iterator_neg.cc b/libstdc++-v3/testsuite/tr1/6_containers/unordered_set/requirements/iterator_neg.cc
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+++ b/libstdc++-v3/testsuite/tr1/6_containers/unordered_set/requirements/iterator_neg.cc
@@ -0,0 +1,36 @@
+// 2005-10-02  Paolo Carlini  <pcarlini@suse.de>
+//
+// Copyright (C) 2005, 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/>.
+//
+
+// { dg-do compile }
+
+#include <tr1/unordered_set>
+
+void test01()
+{
+  typedef std::tr1::unordered_set<int> Set;
+
+  Set s;
+
+  Set::const_iterator cit = s.begin();
+  *cit = 0; // { dg-error "read-only" }
+
+  Set::const_local_iterator clit = s.begin(0);
+  *clit = 0; // { dg-error "read-only" }
+}