--- a/mercurial/cmdutil.py	Sat Mar 31 23:49:58 2018 +0530
+++ b/mercurial/cmdutil.py	Mon Apr 02 23:52:43 2018 -0700
@@ -1058,6 +1058,8 @@
             if 'treemanifest' not in repo.requirements:
                 raise error.Abort(_("--dir can only be used on repos with "
                                    "treemanifest enabled"))
+            if not dir.endswith('/'):
+                dir = dir + '/'
             dirlog = repo.manifestlog._revlog.dirlog(dir)
             if len(dirlog):
                 r = dirlog