arison is needed. Experimental function </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <span class="keyword">void</span> <a name="idp56896336-bb"></a><span class="identifier">unlink</span><span class="special">(</span><span class="identifier">node_ptr</span> node<span class="special">)</span><span class="special">;</span></pre>
<p><span class="bold"><strong>Requires</strong></span>: node is a tree node but not the header.</p>
<p><span class="bold"><strong>Eff