.

wcfs/internal/xbtree/treediff.go

@@ -390,6 +390,7 @@ func treediff(ctx context.Context, root zodb.Oid, δtops setOid, δZTC setOid, t
 //
 // a/b can be nil; a=nil means addition, b=nil means deletion.
 //
+//
 // δtrack is trackSet δ that needs to be applied to trackSet to keep it
 // consistent with b (= a + δ).
 //
@@ -834,7 +835,6 @@ func δMerge(δ, δ2 map[Key]ΔValue) error {
 
 		// both δ and δ2 has [k] - it can be that key
 		// entry migrated from one bucket into another.
-		// XXX also handle ø->ø + ø->c  i.e. [k] was hole and become value
 		if !( (δv1.New == VDEL && δv2.Old == VDEL) ||
 		      (δv1.Old == VDEL && δv2.New == VDEL) ) {
 			return fmt.Errorf("BUG or btree corrupt: [%v] has " +