title: swift compilation error: Downcast from 'String?!' to 'String' only unwraps optionals; did you mean to use '!!'?
body: <p>After upgrading to cocoapods 1.0, I get this compilation error for these lines of code:</p>
  
  <pre><code>var strName = String()
  var strEmail = String()
  var strFacebookID = String()
  var strPassword = String()
  var objHelper = Helper()
  
  ....
  
  let strFirstName = result["first_name"] as! String
  let strLastName = result["last_name"] as! String
  self.strName = strFirstName + "_" + strLastName
  self.strEmail = result["email"] as! String
  self.strFacebookID = result["id"] as! String
  </code></pre>
  
  <blockquote>
    <p>Downcast from 'String?!' to 'String' only unwraps optionals; did you mean to use '!!'? </p>
  </blockquote>
  
  <p>Here is a screenshot of the error in detail:
  <a href="http://imgur.com/Efe1nQf" rel="nofollow">http://imgur.com/Efe1nQf</a></p>
  
  <p>UPDATE:
  more code here: <a href="https://gist.github.com/anonymous/9c91c2eb1ccf269e78a118970468d1e8" rel="nofollow">https://gist.github.com/anonymous/9c91c2eb1ccf269e78a118970468d1e8</a></p>