--- a/hgext3rd/topic/compat.py	Mon Mar 19 11:18:47 2018 -0700
+++ b/hgext3rd/topic/compat.py	Mon Mar 19 15:46:17 2018 -0700
@@ -7,6 +7,8 @@
 """
 from __future__ import absolute_import
 
+import functools
+
 from mercurial import (
     obsolete,
     scmutil,
@@ -30,7 +32,10 @@
 # Wrap obsolete.creatmarkers and make it accept but ignore "operation" argument
 # for hg < 4.3
 createmarkers = obsolete.createmarkers
-if obsolete.createmarkers.__code__.co_argcount < 6:
+originalcreatemarkers = createmarkers
+while isinstance(originalcreatemarkers, functools.partial):
+    originalcreatemarkers = originalcreatemarkers.func
+if originalcreatemarkers.__code__.co_argcount < 6:
     def createmarkers(repo, relations, flag=0, date=None, metadata=None,
                       operation=None):
         return obsolete.createmarkers(repo, relations, flag, date, metadata)