s="special">{</span>
    <span class="identifier">word_count_tokens</span><span class="special">()</span>
    <span class="special">{</span>
        <span class="comment">// define tokens (the regular expression to match and the corresponding</span>
        <span class="comment">// token id) and add them to the lexer </span>
        <span class="keyword">this</span><span class="special">-&gt;</span><span class="identifier">self</span><span class="special">.</span><span class="identifier">add</span>
        