--- a/hgext/evolve.py	Tue Jun 16 17:56:23 2015 -0700
+++ b/hgext/evolve.py	Fri Jun 19 14:32:54 2015 -0700
@@ -1412,6 +1412,18 @@
         raise util.Abort(msg)
     elif len(specifiedcategories) == 1:
         targetcat = specifiedcategories[0]
+    elif repo['.'].obsolete():
+        displayer = cmdutil.show_changeset(ui, repo, {'template': shorttemplate})
+        # no args and parent is obsolete, update to successors
+        try:
+            ctx = repo[_singlesuccessor(repo, repo['.'])]
+        except MultipleSuccessorsError, exc:
+            repo.ui.write_err('parent is obsolete with multiple successors:\n')
+            for ln in exc.successorssets:
+                for n in ln:
+                    displayer.show(repo[n])
+            return 2
+
 
     ui.setconfig('ui', 'forcemerge', opts.get('tool', ''), 'evolve')
     troubled = set(repo.revs('troubled()'))