--- a/mercurial/manifest.py	Sat Mar 31 23:49:58 2018 +0530
+++ b/mercurial/manifest.py	Mon Apr 02 23:52:43 2018 -0700
@@ -1160,8 +1160,6 @@
 
         if dir:
             assert self._treeondisk, 'opts is %r' % opts
-            if not dir.endswith('/'):
-                dir = dir + '/'
 
         if indexfile is None:
             indexfile = '00manifest.i'