I made a Swift extension to use frames like I would on iOS but Can't compile while using it -

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I created this extension in NSV so that it is easy to work with the scenes. 

  import Cocoa public extension NSView {var Inverted Frame: NSRect (get {return NSRect (x: frame.origin.x, y: superview.bounds.height - frame.origin.y, width: Bounds.isize.width, height: bounds.size) .height)} set {self.frame = NSRect (x: newValue.origin.x, y: superview.bounds.height - newValue.origin.y - newValue.height, Width: newValue.width, height: newValue.height)}}}   
 But whenever I try to use it, I get an error compiling time ...  
  commands / applications / Xcode6- beta4.app/   
 However if I computed in a class implementation Cut and paste the A variable so it works fine.    P> 
 I'm not sure why this is something wrong with my code? Can anyone do this work?   
 
 
 Your property setter  newValue  as a method parameter, Rather than saying that, the compiler is clearly crashed. Remember that a bare  set  is only found in an  protocol  property declaration.

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