Things that don't work in Swift but should

broken.swift

//MARK: instancetype
//Xcode 7A176x
extension UIViewController {

    class func fromStoryboard(named name: String) -> Self {
        let storyboard = UIStoryboard(name: name, bundle: NSBundle.mainBundle())
        let classname = NSStringFromClass(self) as NSString //Error: Type 'Self" does not conform to protocol 'AnyObject'
        return storyboard.instantiateViewControllerWithIdentifier(classname.pathExtension)
    }
}
    
//Instead (thanks to http://stackoverflow.com/a/27112385/1153630) :
extension UIViewController {
    
    class func fromStoryboard(named name: String) -> Self {
        return internalFromStoryboard(named: name)
    }
    
    private class func internalFromStoryboard<T>(named name: String) -> T {
        let storyboard = UIStoryboard(name: name, bundle: NSBundle.mainBundle())
        let classname = entityName()
        return storyboard.instantiateViewControllerWithIdentifier(classname) as! T
    }
    
    private class func entityName() -> String {
        let classname = NSStringFromClass(self) as NSString
        return classname.pathExtension
    }
}
 
//MARK: Lazy Instantiation (7A176x)
lazy private var backgroundImage = UIImage(named: "test") //Error: cannot invoke 'init' with an argument list of type '(named: String)'


//MARK: Classes that conform to Protocols are not possible in Swift (7A192o)
@property(..) UIView<SomeProtocol> *myView


//MARK: JSON Serialization of backslash goes crazy (GM 7A218)
  3> import Foundation
  4> let timeInterval = Int(NSDate().timeIntervalSince1970 * 1000) 
timeInterval: Int = 1442192636505
  5> let s = "\\/Date(\(timeInterval))\\/"
s: String = "\\/Date(1442192636505)\\/"
  6> print(s)
\/Date(1442192636505)\/
  7> let params = ["Date": s]
params: [String : String] = 1 key/value pair {
  [0] = {
    key = "Date"
    value = "\\/Date(1442192636505)\\/"
  }
}
  8> print(NSJSONSerialization.dataWithJSONObject(params, options: NSJSONWritingOptions.PrettyPrinted))
<7b0a2020 22446174 6522203a 20225c5c 5c2f4461 74652831 34343231 39323633 36353035 295c5c5c 2f220a7d>
  9> let data = NSJSONSerialization.dataWithJSONObject(params, options: NSJSONWritingOptions.PrettyPrinted)
data: NSData = 44 bytes
 10> let newString = String(data:data, encoding:NSUTF8StringEncoding)
newString: String? = "{\n  \"Date\" : \"\\\\\\/Date(1442192636505)\\\\\\/\"\n}"
 11> print(newString)
Optional("{\n  \"Date\" : \"\\\\\\/Date(1442192636505)\\\\\\/\"\n}")
 12> print(newString!)
{
  "Date" : "\\\/Date(1442192636505)\\\/"
}
 13> 
 
 //Can't have a [AnyObject] public property that is immutable (7C68)
 @property (..., copy)  NSArray *test