diff -r 07439e9f245b -r 4e30168d7939 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Tue Jun 27 01:48:41 2017 +0200
+++ b/mercurial/debugcommands.py	Tue Jun 27 01:51:40 2017 +0200
@@ -307,7 +307,7 @@
         ui.write(msg)
         fm = ui.formatter('debugobsolete', opts)
         for rawmarker in sorted(markers):
-            m = obsolete.marker(None, rawmarker)
+            m = obsutil.marker(None, rawmarker)
             fm.startitem()
             fm.plain(indent_string)
             cmdutil.showmarker(fm, m)