an> <span class="mi">1</span>
      <span class="nx">i</span> <span class="o">+=</span> <span class="mi">1</span>
    <span class="nx">i</span> <span class="o">-</span> <span class="mi">1</span></pre></div>             </td>           </tr>                               <tr id="section-6">             <td class="docs">               <div class="pilwrap">                 <a class="pilcrow" href="#section-6">&#182;</a>               </div>               <p>Leading newlines would introduce an ambiguity in the 