--- a/tests/test-ancestor.py.out	Sat Sep 08 10:48:42 2018 +0900
+++ b/tests/test-ancestor.py.out	Sat Sep 08 10:59:24 2018 +0900
@@ -20,5 +20,5 @@
 membership: [11, 13]
 iteration:  [13, 11]
 % lazy ancestor set for [11, 13], stoprev = 12, inclusive = True
-membership: [11, 13]
+membership: [13]
 iteration:  [13]