method · iOS 15.0+nextTypeScriptnext(): Promise<(Product_SubscriptionInfo_Status) | null>Swift declarationmutating func next() async -> Product.SubscriptionInfo.Status.Statuses.Element?Asynchronously advances to the next element and returns it, or ends the sequence if there is no next element. - Returns: The next element, if it exists, or `nil` to signal the end of the sequence.