--- /dev/null
+// { dg-options "-std=gnu++0x" }
+
+// 2008-06-11 Paolo Carlini <paolo.carlini@oracle.com>
+
+// Copyright (C) 2008, 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 <unordered_map>
+#include <testsuite_hooks.h>
+
+// DR 691.
+void test01()
+{
+ bool test __attribute__((unused)) = true;
+
+ typedef std::unordered_map<int, int> um_type;
+ um_type um;
+ um[1] = 1;
+ VERIFY( um.cbegin(0) == um.begin(0) );
+ VERIFY( um.cend(0) == um.end(0) );
+ const um_type::size_type bn = um.bucket(1);
+ VERIFY( um.cbegin(bn) != um.cend(bn) );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}