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diff --git a/common/polymorphism/test12.hxx b/common/polymorphism/test12.hxx
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+++ b/common/polymorphism/test12.hxx
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+// file      : common/polymorphism/test12.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST12_HXX
+#define TEST12_HXX
+
+#include <typeinfo>
+
+#include <odb/core.hxx>
+
+// Test polymorphic classes with private auto id.
+//
+#pragma db namespace table("t12_")
+namespace test12
+{
+  #pragma db object polymorphic
+  struct root
+  {
+    virtual ~root () = 0; // Auto-abstract.
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (root))
+        return false;
+
+      return id_ == r.id_;
+    }
+
+    unsigned long id () const {return id_;}
+    void id (unsigned long id) {id_ = id;}
+  private:
+    #pragma db id auto access(id)
+    unsigned long id_;
+  };
+
+  inline root::
+  ~root () {}
+
+  inline bool
+  operator== (const root& x, const root& y) {return x.compare (y);}
+
+  #pragma db object
+  struct base: root
+  {
+    base () {}
+    base (unsigned long n): num (n) {}
+
+    unsigned long num;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (base))
+        return false;
+
+      const base& b (static_cast<const base&> (r));
+      return root::compare (r, false) && num == b.num;
+    }
+  };
+
+  #pragma db object
+  struct derived: base
+  {
+    derived () {}
+    derived (unsigned long n): base (n) {}
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (derived))
+        return false;
+
+      return base::compare (r, false);
+    }
+  };
+}
+
+#endif // TEST12_HXX