--- a/mercurial/revset.py	Thu Jul 05 09:53:00 2018 +0530
+++ b/mercurial/revset.py	Sun Jun 10 17:07:29 2018 +0900
@@ -112,7 +112,7 @@
     return None
 
 def _sortedb(xs):
-    return sorted(util.rapply(pycompat.maybebytestr, xs))
+    return sorted(pycompat.rapply(pycompat.maybebytestr, xs))
 
 # operator methods