--- a/mercurial/revset.py	Mon May 01 05:57:36 2017 +0200
+++ b/mercurial/revset.py	Sun Jun 18 12:25:23 2017 +0900
@@ -392,7 +392,7 @@
             if len(c) > 1:
                 raise error.RepoLookupError(
                     _("revision in set has more than one child"))
-            r = c[0]
+            r = c[0].rev()
         else:
             cs.add(r)
     return subset & cs