var body: some View {. ------->Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project       ZStack{       LinearGradient(gradient: Gradient(colors: [Color.green, Color.white]), startPoint: .topLeading, endPoint: .bottomTrailing)         .edgesIgnoringSafe(.all)   class ViewController: UIViewController{     override func viewDidLoad() {       super.viewDidLoad