ss="special">&gt;</span> <span class="identifier">as_symbol_type</span><span class="special">;</span>
<span class="identifier">as_symbol_type</span> <span class="keyword">const</span> <span class="identifier">as_symbol</span> <span class="special">=</span> <span class="identifier">as_symbol_type</span><span class="special">();</span>

<span class="identifier">utree</span> <span class="identifier">ut</span><span class="special">;</span>
<span class="identifier">ut</span><span class="special">.</span><span cl