         let observation5 = ValueObservation.trackingCount(T5.all())
         let observation6 = ValueObservation.trackingCount(T6.all())
         let observation = ValueObservation.combine(observation1, observation2, observation3, observation4, observation5, observation6)
-        let observer = try observation.start(in: dbQueue) { v in
-            values.append([v.0, v.1, v.2, v.3, v.4, v.5])
+        let observer = try observation.start(in: dbQueue) { v0, v1, v2, v3, v4, v5 in
+            values.append([v0, v1, v2, v3, v4, v5])
             notificationExpectation.fulfill()
         }
         try withExtendedLifetime(observer) {

        let observation1 = ValueObservation.trackingCount(T1.all())
        let observation2 = ValueObservation.trackingCount(T2.all())
        let observation = ValueObservation.combine(observation1, observation2)
        let observer = try observation.start(in: dbQueue) { v in
            values.append([v.0, v.1])
            notificationExpectation.fulfill()
        }
        try withExtendedLifetime(observer) {

        let observation3 = ValueObservation.trackingCount(T3.all())
        let observation4 = ValueObservation.trackingCount(T4.all())
        let observation = ValueObservation.combine(observation1, observation2, observation3, observation4)
        let observer = try observation.start(in: dbQueue) { v0, v1, v2, v3 in
            values.append([v0, v1, v2, v3])
            notificationExpectation.fulfill()
        }
        try withExtendedLifetime(observer) {
