Strange that this code is passed whereas on the playground it is throwing an error.

class TemperatureController: UIViewController {
      var temperature: Double {
         didSet{
             var setColor: UIColor
             switch temperature{
             case 1.0..<40.0: setColor = UIColor.blue
             case 40.0..<60.0: setColor = UIColor.green
             default: setColor = UIColor.red
             }
             view.backgroundColor = setColor
         }
      }
     init(temperature: Double) {
        self.temperature = temperature
        super.init()
     }    
     override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white        
     }    
}