let a = x as Int?? let b = (x as? Int??)! let c = Int?.none as Int?? let d = (Int?.none as? Int??)! let e = (y as [Int??]).first! let f = (y as? [Int??])!.first! let g = ([Int?.none] as [Int??]).first! let h = ([Int?.none] as? [Int??])!.first!
