title: Creating an enum instance
body: <p>suppose I have</p>
  
  <pre><code>enum Example {
    case one(string: String)
    case two(string: String)
  }
  </code></pre>
  
  <p>and now I have </p>
  
  <pre><code>let x = Example.one(string: "Hello")
  </code></pre>
  
  <p>The question:</p>
  
  <pre><code>let y = ?
  </code></pre>
  
  <p>how do I create another instance of the same enum in <code>e</code>, so that I end up with <code>y == .one("World")</code>)</p>