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diff --git a/libstdc++-v3/testsuite/19_diagnostics/error_category/operators/not_equal.cc b/libstdc++-v3/testsuite/19_diagnostics/error_category/operators/not_equal.cc
new file mode 100644
index 00000000000..7d5f8d3021d
--- /dev/null
+++ b/libstdc++-v3/testsuite/19_diagnostics/error_category/operators/not_equal.cc
@@ -0,0 +1,62 @@
+// { dg-options "-std=gnu++0x" }
+// 2007-08-22 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2007 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+#include <system_error>
+#include <testsuite_hooks.h>
+
+namespace __gnu_test
+{
+  struct test_category : public std::error_category
+  { 
+    virtual std::posix_errno 
+    posix(int __v) const
+    { return std::posix_errno(__v); }
+
+    virtual const std::string& 
+    name() const 
+    { 
+      static std::string s("__gnu_test::test_category");
+      return s;
+    }
+  };
+
+  struct test_derived_category : public test_category
+  { 
+    virtual const std::string& 
+    name() const 
+    { 
+      static std::string s("__gnu_test::test_derived_category");
+      return s;
+    }
+  };
+}
+
+int main()
+{
+  bool test __attribute__((unused)) = true;
+
+  __gnu_test::test_category c1;
+  __gnu_test::test_derived_category c2;
+  VERIFY( !(c1 != c1) );
+  VERIFY( c1 != c2 );
+
+  return 0;
+}