preted as 'this parser has no attribute'.
        This is mostly used for parsers applied to parts of the input not carrying
        any significant information, rather being delimiters or structural elements
        needed for correct interpretation of the input.
      </p>
<p>
        The last difference might seem to be rather cosmetic and insignificant. But
        it turns out that not having to specify which rule in a grammar is the start
        rule (by returning it from the function <code class="co