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<pre><span class="ruby-comment cmt"># File htree/traverse.rb, line 369</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">root</span>
<span class="ruby-identifier">es</span> = []
<span class="ruby-identifier">children</span>.<span class="ruby-identifier">each</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">c</span><span class="ruby-operator">|</span> <span class="ruby-identifier">es</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">c</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">c</span>.<span class="ruby-identifier">elem?</span> }
<span class="ruby-identifier">raise</span> <span class="ruby-constant">HTree</span><span class="ruby-operator">::</span><span class="ruby-constant">Error</span>, <span class="ruby-value str">"no element"</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">es</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-identifier">raise</span> <span class="ruby-constant">HTree</span><span class="ruby-operator">::</span><span class="ruby-constant">Error</span>, <span class="ruby-value str">"multiple top elements"</span> <span class="ruby-keyword kw">if</span> <span class="ruby-value">1</span> <span class="ruby-operator"><</span> <span class="ruby-identifier">es</span>.<span class="ruby-identifier">length</span>
<span class="ruby-identifier">es</span>[<span class="ruby-value">0</span>]
<span class="ruby-keyword kw">end</span></pre>
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