.

wcfs/internal/xbtree/blib/rangeset.go

@@ -101,8 +101,9 @@ func (A *RangedKeySet) DifferenceInplace(B *RangedKeySet) {
 	defer A.verify()
 
 	// XXX dumb
-	for _, r := range B.rangev {
-		if len(A.rangev) == 0 {
+//	for _, r := range B.rangev {
+	for _, r := range B.AllRanges() {
+		if A.Empty() {
 			break
 		}
 		A.DelRange(r)
@@ -137,6 +138,11 @@ func (S *RangedKeySet) Clear() {
 	S.m.Clear()
 }
 
-// AllRanges
+// AllRanges returns slice of all key ranges in the set.
+//
+// TODO -> iter?
+func (S *RangedKeySet) AllRanges() /*readonly*/[]KeyRange {
+	return []KeyRange(S.m.AllRanges())
+}
 
 // String