diff -r faf75a701aca -r d1937bdcee8c mercurial/util.py
--- a/mercurial/util.py	Sun Mar 19 00:22:04 2017 -0400
+++ b/mercurial/util.py	Sun Mar 19 00:16:08 2017 -0400
@@ -1177,7 +1177,7 @@
     for n in path.replace('\\', '/').split('/'):
         if not n:
             continue
-        for c in n:
+        for c in pycompat.bytestr(n):
             if c in _winreservedchars:
                 return _("filename contains '%s', which is reserved "
                          "on Windows") % c