@class NSString, _BPSFlatMapOuter; @interface _BPSFlatMapSide : NSObject <BPSSubscriber> @property (nonatomic) long long index; @property (retain, nonatomic) _BPSFlatMapOuter *outer; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (void)receiveCompletion:(id)a0; - (void)receiveSubscription:(id)a0; - (long long)receiveInput:(id)a0; - (void).cxx_destruct; - (void)cancel; - (id)initWithIndex:(long long)a0 outer:(id)a1; @end