.

wcfs/δbtail.go

@@ -1020,13 +1020,13 @@ func δMerge(δ, δ2 map[Key]ΔValue) error {
 		case δv1.Old == VDEL && δv1.New == VDEL: // δv1 == hole
 			δv = δv2
 
-		// ø -> x
+		// ø -> x	-> y->x
 		// y -> ø
 		case δv2.New == VDEL:
 			δv.Old = δv2.Old
 			δv.New = δv1.New
 
-		// x -> ø
+		// x -> ø	-> x->y
 		// ø -> y
 		default:
 			δv.Old = δv1.Old