>self</span>, <span class="fu">super</span><span class="op">(</span><span class="op">)</span><span class="op">$</span><span class="va">foo</span><span class="op">)</span><span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">}</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Define class D</span></span></span>
<span class="r-in"><span><span class="va">D</span> <span class="op"