n><span class="identifier">id</span><span class="special">())</span> <span class="special">{</span>
        <span class="keyword">case</span> <span class="identifier">ID_WORD</span><span class="special">:</span>       <span class="comment">// matched a word</span>
        <span class="comment">// since we're using a default token type in this example, every </span>
        <span class="comment">// token instance contains a `iterator_range&lt;BaseIterator&gt;` as its token</span>
        <span class="comment