"hljs-keyword">object</span>
        height: <span class="hljs-built_in">int</span>
        <span class="hljs-keyword">case</span> isPair: <span class="hljs-built_in">bool</span>
        <span class="hljs-keyword">of</span> <span class="hljs-literal">true</span>:
          left, right: <span class="hljs-type">Number</span>
        <span class="hljs-keyword">of</span> <span class="hljs-literal">false</span>:
          value: <span class="hljs-built_in">int</span>

  <span class="hljs-keyword">type</span>
   