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diff --git a/tests/cxx/tree/polymorphism/comparison/driver.cxx b/tests/cxx/tree/polymorphism/comparison/driver.cxx
new file mode 100644
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+++ b/tests/cxx/tree/polymorphism/comparison/driver.cxx
@@ -0,0 +1,75 @@
+// file      : tests/cxx/tree/polymorphism/comparison/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2006-2009 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+// Test comparison of polymorphic object models.
+//
+
+#include <memory> // std::auto_ptr
+#include <iostream>
+
+#include "test.hxx"
+
+using namespace std;
+using namespace test;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " test.xml" << endl;
+    return 1;
+  }
+
+  try
+  {
+    auto_ptr<type> r (root (argv[1]));
+
+    // Equals.
+    //
+    {
+      derived1 d ("a", 1);
+      d.b ("b");
+      type r1 (d);
+
+      assert (*r == r1);
+    }
+
+    // Values are not equal.
+    //
+    {
+      derived1 d ("a", 1);
+      d.b ("c");
+      type r1 (d);
+
+      assert (*r != r1);
+    }
+
+    // Values are not equal.
+    //
+    {
+      derived1 d ("a", 2);
+      d.b ("b");
+      type r1 (d);
+
+      assert (*r != r1);
+    }
+
+    // Different types.
+    //
+    {
+      derived2 d ("a", 1);
+      d.c ().push_back ("c");
+      type r1 (d);
+
+      assert (*r != r1);
+    }
+  }
+  catch (xml_schema::exception const& e)
+  {
+    cerr << e << endl;
+    return 1;
+  }
+}