taining the information
    about a failed parser node</li>
  <li>a single <span class="literal">'^'</span> starts a line containing the first member (return value/synthesised
    attribute) of the closure of a successfully matched parser node.</li>
</ul>
<p>Check out  <a href="../example/fundamental/calc_debug.cpp">calc_debug.cpp</a> to see debugging in action. </p>
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