ation">.</span><a href="../to-not-empty-set-or-null.html"><span class="token function">toNotEmptySetOrNull</span></a><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">: </span><a href="index.html">NotEmptySet</a><span class="token operator">&lt;</span><span class="token keyword"></span><a href="../to-not-empty-set-or-null.html">E</a><span class="token operator">&gt;</span><span class="token operator">?</span></div><div class="brief "><p class="parag