s="hl opt">+=</span> <span class="hl str">'  '</span><span class="hl opt">;</span>
    <span class="hl opt">};</span>

    Output<span class="hl opt">.</span><span class="hl kwa">prototype</span><span class="hl opt">.</span>leave <span class="hl opt">=</span> <span class="hl kwa">function</span><span class="hl opt">() {</span>
      <span class="hl kwa">return this</span><span class="hl opt">.</span>indents <span class="hl opt">=</span> <span class="hl kwa">this</span><span class="hl opt">.</span>indents<sp