ore consistent and moves the
            rule 'body' at the same indentation level as the rule itself, highlighting
            the unary operator.
          </li></ul></div>
<pre class="programlisting"><span class="identifier">block</span>
   <span class="special">=</span>  <span class="special">*(</span>   <span class="identifier">label_declaration_part</span>
       <span class="special">|</span>   <span class="identifier">constant_definition_part</span>
       <span class="special">|</span>   <span clas