@class NSManagedObjectModelReference; @interface NSCustomMigrationStage : NSMigrationStage @property (readonly) NSManagedObjectModelReference *currentModel; @property (readonly) NSManagedObjectModelReference *nextModel; @property (copy) id /* block */ willMigrateHandler; @property (copy) id /* block */ didMigrateHandler; - (void)dealloc; - (id)initWithCurrentModelReference:(id)a0 nextModelReference:(id)a1; @end