title: Cannot convert value of Unsafe pointer<Int8>? to expected argument type xcode 8
body: <p>With Xcode8, I've been upgrading to Swift 3. However I'm getting this error:</p>
  
  <blockquote>
    <p>Cannot convert value of Unsafe pointer? to expected argument type 'String'</p>
  </blockquote>
  
  <p>With this line of code:</p>
  
  <pre><code>let queue = DispatchQueue(label: (name as NSString).utf8String, attributes: [])
  </code></pre>
  
  <p>What does this mean and how do I resolve that?</p>