static func ignore_elements_() -> Callable:
#	"""Ignores all elements in an observable sequence leaving only the
#	termination messages.
#
#	Returns:
#		An empty observable {Observable} sequence that signals
#		termination, successful or exceptional, of the source sequence.
#	"""
	var ignore_elements = func(source : Observable) -> Observable:
		var subscribe = func(
			observer : ObserverBase, 
			scheduler : SchedulerBase = null
		) -> DisposableBase:
			return source.subscribe(
				func(__):return,
				observer.on_error,
				observer.on_completed,
				scheduler
			)
		
		return Observable.new(subscribe)
	
	return ignore_elements