>      </span><span class="n">tok</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">stack</span><span class="p">%</span><span class="n">tokens</span><span class="p">(</span><span class="n">stack</span><span class="p">%</span><span class="n">top_index</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><s