code helping to tie together
          the pieces described so far. To simplify this example we call the <code class="computeroutput"><span class="identifier">lex</span><span class="special">::</span><span class="identifier">tokenize</span><span class="special">()</span></code>
          function implemented in <span class="emphasis"><em>Spirit.Lex</em></span> (for a more detailed
          description of this function see here: <span class="bold"><strong>FIXME</strong></span>),
          even if we could h