title: Xcode 7.3: import Module displayed with strikethrough
body: <p>After upgrading Xcode to 7.3, I just found that some modules are stricken out while importing, like in this screenshot:</p>
  
  <p><a href="https://i.stack.imgur.com/8APL3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/8APL3.png" alt=""></a></p>
  
  <p>But after adding the module (so just pressing <kbd>enter</kbd>) everything is fine. What does that mean? The module here is written in Swift and works fine. </p>