--- a/hgext3rd/topic/__init__.py	Fri Nov 15 08:14:06 2019 -0800
+++ b/hgext3rd/topic/__init__.py	Fri Nov 15 11:37:34 2019 +0700
@@ -135,6 +135,7 @@
     namespaces,
     node,
     obsolete,
+    obsutil,
     patch,
     phases,
     pycompat,
@@ -1117,7 +1118,7 @@
                 user = repo[revs].user()
             # looking on the markers also to get more information and accurate
             # last touch time.
-            obsmarkers = compat.getmarkers(repo, [repo[revs].node()])
+            obsmarkers = obsutil.getmarkers(repo, [repo[revs].node()])
             for marker in obsmarkers:
                 rt = marker.date()
                 if rt[0] > maxtime[0]:

--- a/hgext3rd/topic/compat.py	Fri Nov 15 08:14:06 2019 -0800
+++ b/hgext3rd/topic/compat.py	Fri Nov 15 11:37:34 2019 +0700
@@ -14,17 +14,13 @@
     util,
 )
 
-getmarkers = None
 successorssets = None
 try:
     from mercurial import obsutil
-    getmarkers = getattr(obsutil, 'getmarkers', None)
     successorssets = getattr(obsutil, 'successorssets', None)
 except ImportError:
     pass
 
-if getmarkers is None:
-    getmarkers = obsolete.getmarkers
 if successorssets is None:
     successorssets = obsolete.successorssets