.

wcfs/δbtail.go

@@ -319,6 +319,10 @@ func (δBtail *ΔBtail) Track(ctx context.Context, key Key, keyPresent bool, pat
 	// remember missing keys in track of leaf node (bucket or top-level ø tree)
 	if !keyPresent {
 		track.holes.Add(key)
+	} else {
+		if track.holes.Has(key) {
+			panicf("[%v] was previously requested to be tracked as ø", key)
+		}
 	}