"n">stack</span><span class="p">%</span><span class="n">tokens</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><span class="n">N</span><span class="p">))</span><span class="w"></span>
<span class="w">    </span><span class="n">stack</span><span class="p">%</span><span class="n">top_index</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="w"></span>

<span class="w">  </span><span class="k">endsubroutine </span><s