   <span class="required">Required</span>    
<div class="comment collapse" id="comment-func-insert_"><div class="p">
    <p>If <code>member</code> is not already contained in <code>self</code>, inserts it.</p>

<ul><li>Equivalent to <code>self.unionInPlace([member])</code>
<strong>Postcondition:</strong> <code>self.contains(member)</code></li></ul>

    <h4>Declaration</h4>    
    <code class="language-swift">mutating func insert(member: Self.Element)</code>
    
    
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<div class="decla