.

wcfs/δbtail.go

@@ -915,7 +915,7 @@ func diffT(ctx context.Context, a, b *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 
 			// k is not there -> +[k]ø
 			if !Bdone.Has(k) {
-				δB := map[Key]ΔValue{k: {VDEL, VDEL}} // hole
+				δB := map[Key]ΔValue{k: {VDEL, VDEL}} // [k]ø->ø
 				err = δMerge(δ, δB);  if err != nil { return nil, err }
 				Bdone.Add(k)
 			}
@@ -966,7 +966,8 @@ func diffT(ctx context.Context, a, b *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 
 			// k is not there -> -[k]ø
 			if !Adone.Has(k) {
-				// XXX
+				// XXX do we need to add(?) [k]ø->ø ?
+				Adone.Add(k)
 			}
 
 			fmt.Printf("  av: %s\n", av)