 <span class=identifier>rule</span><span class=special>&lt;</span><span class=identifier>as_lower_scanner</span><span class="special">&lt;</span><span class=identifier>ScannerT</span><span class=special>&gt;::</span><span class="identifier">type</span><span class=special>&gt; </span>r<span class=special>;</span></pre>
<p>where <span class=identifier><tt>ScannerT</tt></span> is the actual type of 
  the scanner used. </p>
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  <tr> 
    <td class="note_box"><img src