nside a <tt>lexeme_d</tt>, 
  the rule's type must be:</p>
<pre>    <span class=identifier>rule</span><span class=special>&lt;</span><span class=identifier>lexeme_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. Take note that <tt>lexeme_s