title: Cannot invoke substringToIndex with an arguement list type int
body: <p>I'm trying to get this line to work:</p>
  
  <pre><code>textView.text = textView.text.substringToIndex(count(textView.text.utf16) - 1)
  </code></pre>
  
  <p>error:  Cannot invoke substringToIndex with an arguement list type int</p>