Crash with Xcode 11.2.1 DEBUG build configuration

[titiphoque]

Thank you for your work. It's nice to have developer that take time to develop Combine framework.

Problem : When I build CombineDataSources it's ok but when we launch the app it crash without any error message. If we compile in Release everything is fine?

Available fix : It's a temporary fix but setting the "Dead Code Stripping" settings to "NO" solve the problem. See: https://github.com/ReactiveX/RxSwift/issues/2099#issuecomment-548978168