class="Identifier">initOnce</span> <span class="Identifier">o</span>

<span class="Keyword">proc</span> <span class="Identifier">getInstance</span><span class="Punctuation">(</span><span class="Punctuation">)</span><span class="Punctuation">:</span> <span class="Keyword">ptr</span> <span class="Identifier">Singleton</span> <span class="Operator">=</span>
  <span class="Identifier">once</span><span class="Punctuation">(</span><span class="Identifier">o</span><span class="Punctuation">)</span><span class="Pun