class="nx">tag</span> <span class="o">is</span> <span class="s1">&#39;?&#39;</span>
      <span class="k">return</span> <span class="mi">1</span> <span class="k">if</span> <span class="nx">token</span><span class="p">.</span><span class="nx">fromThen</span>
      <span class="k">return</span> <span class="mi">1</span> <span class="nx">unless</span> <span class="nx">callObject</span> <span class="o">or</span>
        <span class="nx">prev</span><span class="o">?</span><span class="p">.</span><span class="nx"