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diff --git a/evolution/drop-index/driver.cxx b/evolution/drop-index/driver.cxx
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+// file      : evolution/drop-index/driver.cxx
+// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+// Test dropping an index.
+//
+
+#include <memory>   // std::auto_ptr
+#include <cassert>
+#include <iostream>
+
+#include <odb/database.hxx>
+#include <odb/transaction.hxx>
+
+#include <common/common.hxx>
+
+#include "test1.hxx"
+#include "test2.hxx"
+#include "test1-odb.hxx"
+#include "test2-odb.hxx"
+
+using namespace std;
+using namespace odb::core;
+
+int
+main (int argc, char* argv[])
+{
+  try
+  {
+    auto_ptr<database> db (create_database (argc, argv));
+
+    // 1 - base version
+    // 2 - migration
+    // 3 - current version
+    //
+    unsigned short pass (*argv[argc - 1] - '0');
+
+    switch (pass)
+    {
+    case 1:
+      {
+        using namespace v2;
+
+        object o0 (0);
+        o0.num = 123;
+
+        object o1 (1);
+        o1.num = 234;
+
+        object o2 (2);
+        o2.num = 234;
+
+        {
+          transaction t (db->begin ());
+          db->persist (o0);
+          db->persist (o1);
+          t.commit ();
+        }
+
+        // Duplicates are not ok.
+        //
+        try
+        {
+          transaction t (db->begin ());
+          db->persist (o2);
+          assert (false);
+        }
+        catch (const odb::exception& ) {}
+
+        break;
+      }
+    case 2:
+      {
+        using namespace v3;
+
+        // Duplicates are now ok.
+        //
+        object o2 (2);
+        o2.num = 234;
+
+        {
+          transaction t (db->begin ());
+          db->persist (o2);
+          t.commit ();
+        }
+
+        break;
+      }
+    case 3:
+      {
+        using namespace v3;
+
+        {
+          transaction t (db->begin ());
+          auto_ptr<object> p0 (db->load<object> (0));
+          auto_ptr<object> p1 (db->load<object> (1));
+          auto_ptr<object> p2 (db->load<object> (2));
+
+          assert (p0->num == 123);
+          assert (p1->num == 234);
+          assert (p2->num == 234);
+
+          t.commit ();
+        }
+
+        // Duplicates are still ok.
+        //
+        object o3 (3);
+        o3.num = 234;
+
+        {
+          transaction t (db->begin ());
+          db->persist (o3);
+          t.commit ();
+        }
+
+        break;
+      }
+    default:
+      {
+        cerr << "unknown pass number '" << argv[argc - 1] << "'" << endl;
+        return 1;
+      }
+    }
+  }
+  catch (const odb::exception& e)
+  {
+    cerr << e.what () << endl;
+    return 1;
+  }
+}