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extension ObservableType {

    /// Pauses the elements of the source observable sequence based on
    /// the latest element from the second observable sequence.
    /// Elements are ignored unless the second sequence has most recently
    /// emitted `true`.
    /// - Parameter pauser: The observable sequence used to pause the source
    /// observable sequence.
    /// - Returns: The observable sequence which is paused based upon
    /// the pauser observable sequence.

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nextStepper
    .steps
    .pausable(nextPresentable.rxVisible.startWith(true))
    .asDriver(onErrorJustReturn: NoStep())
    .drive(onNext: { [unowned self] (step) in
        // the nextPresentable's Stepper fires a new Step
        self.steps.onNext(step)
    }).disposed(by: nextPresentable.disposeBag)

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private var subjectContext: UInt8 = 0

/// a Stepper has only one purpose: emit Steps that correspond to
/// specific navigation states.
/// The state changes lead to navigation actions in the context of
/// a specific Flow
public protocol Stepper: Synchronizable {

    /// the Rx Obsersable that will trigger new Steps
    var steps: Observable<Step> { get }

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let settingsViewController = SettingsViewController.instantiate()

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public protocol StoryboardBased: class {
  static var storyboard: UIStoryboard { get }
}

public extension StoryboardBased {
  static var storyboard: UIStoryboard {
    return UIStoryboard(name: String(describing: self), bundle: Bundle(for: self))
  }
}

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protocol ViewModelBased: class {
    associatedtype ViewModel
    var viewModel: ViewModel { get set }
}

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extension ViewModelBased where Self: StoryboardBased & UIViewController {
    static func instantiate (with viewModel: ViewModel) -> Self {
        let viewController = Self.instantiate()
        viewController.viewModel = viewModel
        return viewController
    }
}

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class MyViewController: UIViewController, StoryboardBased, ViewModelBased {
    var viewModel: MyViewModel!
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

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let myViewController = MyViewController.instantiate(with: MyViewModel())

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protocol ViewModel {
    associatedtype Services
    init (withServices services: Services)
}