an class="w"></span>

<span class="w">        </span><span class="k">call </span><span class="n">stack</span><span class="p">%</span><span class="n">Push</span><span class="p">(</span><span class="n">b</span><span class="p">)</span><span class="w"></span>

<span class="w">      </span><span class="k">case</span><span class="p">(</span><span class="n">Monadic_Token</span><span class="p">)</span><span class="w"></span>

<span class="w">        </span><span class="k">if</span><span class="p">(</span><span clas