I have a an array of enum cases, I wanna run a switch statement on these cases but getting this error: 'Enum case 'North' not found in type [Directions].

```
enum Directions {
  case north
  case west
  case east
  case south

  static let all  = [north, west, east, south]
}

class MyViewController {
    var directions = Directions.all

    func foo () {
        switch directions {
        case .north: // Error here ('Enum case 'North' not found in type '[Directions]')
            print("Going north")
        }
    }
}

```