@interface _NSKVODeallocSentinel : NSObject { id _observedObject; } + (void)_havingRegistrationLockHeldAttachSentinelToObjectIfNeeded:(id)a0; - (void)dealloc; - (id)_initWithObservedObject:(id)a0; @end
@interface _NSKVODeallocSentinel : NSObject { id _observedObject; } + (void)_havingRegistrationLockHeldAttachSentinelToObjectIfNeeded:(id)a0; - (void)dealloc; - (id)_initWithObservedObject:(id)a0; @end