.

wcfs/δbtail.go

@@ -728,6 +728,8 @@ func diffT(ctx context.Context, A, B *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 	// - ac ∉ δZTC && ∃ bc from B: ac.oid == bc.oid	(ac was not changed and stays in the tree)
 	Aq := []*nodeInRange{atop} // queue for A nodes that contribyte to δ-
 	for len(Aq) > 0 {
+		tracef("  av: %s\n", Av)
+		tracef("  bv: %s\n", Bv)
 		ra := pop(&Aq)
 		err = ra.node.PActivate(ctx);  /*X*/if err != nil { return nil, err }
 		defer ra.node.PDeactivate()
@@ -818,6 +820,7 @@ func diffT(ctx context.Context, A, B *Tree, δZTC SetOid, trackIdx map[zodb.Oid]
 	// * +B12, which queues A.2 and leads to
 	// * -B23, which queues B.3 and leads to
 	// * +B23, ...
+	tracef("\nphase 2:\n")
 	for len(Bkqueue) > 0 {
 		for k := range Bkqueue {
 			b, err := Bv.GetToLeaf(ctx, k);  /*X*/if err != nil { return nil, err }