diff -r d587611d0c78 -r 7b36f9728351 hgext3rd/topic/revset.py
--- a/hgext3rd/topic/revset.py	Tue Jul 09 10:56:42 2019 -0700
+++ b/hgext3rd/topic/revset.py	Tue Jul 09 10:56:42 2019 -0700
@@ -28,7 +28,7 @@
         return x[1]
     raise error.ParseError(err)
 
-@revsetpredicate('topic([string or set])')
+@revsetpredicate(b'topic([string or set])')
 def topicset(repo, subset, x):
     """All changesets with the specified topic or the topics of the given
     changesets. Without the argument, all changesets with any topic specified.
@@ -76,7 +76,7 @@
 
     return (subset & mutable).filter(matches)
 
-@revsetpredicate('ngtip([branch])')
+@revsetpredicate(b'ngtip([branch])')
 def ngtipset(repo, subset, x):
     """The untopiced tip.
 
@@ -89,7 +89,7 @@
         branch = repo['.'].branch()
     return subset & revset.baseset(destination.ngtip(repo, branch))
 
-@revsetpredicate('stack()')
+@revsetpredicate(b'stack()')
 def stackset(repo, subset, x):
     """All relevant changes in the current topic,