"Could not compile..." error, but no compiler errors in the preview-window.

class Point {
  var x: Int
  var y: Int

  init(x: Int, y: Int) {
    self.x = x
    self.y = y
  }
}

class Machine {
  var location: Point

  init() {
    self.location = Point(x: 0, y: 0)
  }

  func move(_ direction: String) {
    print("Do nothing! I am a machine!")
  }
}

// Enter your code below
class Robot: Machine {
    init(x: Int, y: Int) {
        Machine.init()
    }

    func move(direction: String) {
        switch direction {
        case "Left": location.x -= 1
        case "Right": location.x += 1
        case "Down": location.y -= 1
        case "Up": location.y += 1
        default: break
        }
    }
}