.
      <p>
      <li>Oh, this trap is suggesting that the default serialization isn't really 
      what I want. Of course in this particular program it doesn't matter. But 
      then the code in the trap can't really evaluate code in other modules (which 
      might not even be written yet). OK, I'll add the following to my 
      construct_from.hpp to solve the problem. 
<code style="white-space: normal"><pre>
BOOST_CLASS_TRACKING(construct_from, track_never) 
</pre></code>
    </ol>
  </ul>
  <p>
  <l