title: Swift: Switch case with multiple patterns cannot bind to variable
body: <p>In the official <a href="https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Statements.html#//apple_ref/doc/uid/TP40014097-CH33-ID428" rel="nofollow">Swift Programming Language</a> guide, it has this to say about switch case:
  "...if the case contains multiple patterns that match the control expression, none of those patterns can contain constant or variable bindings."</p>
  
  <p>What does it mean by containing multiple patterns?</p>