on</a><span class="token operator">&lt;</span><span class="token keyword"></span><a href="../to-not-empty-mutable-set.html">E</a><span class="token operator">&gt;</span><span class="token punctuation">.</span><a href="../to-not-empty-mutable-set.html"><span class="token function">toNotEmptyMutableSet</span></a><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">: </span><a href="../-not-empty-mutable-set/index.html">NotEmptyMutableSet</a><span class="