protocol _ObjectiveCBridgeable {
    typealias _ObjectiveCType
    static func _isBridgedToObjectiveC() -> Bool
    static func _getObjectiveCType() -> Any.Type
    func _bridgeToObjectiveC() -> _ObjectiveCType
    static func _forceBridgeFromObjectiveC(...)
    static func _conditionallyBridgeFromObjectiveC(...)
}