diff -r 9fd7710d9ae2 -r 34ed651ba7e4 mercurial/scmutil.py
--- a/mercurial/scmutil.py	Sun Sep 08 20:26:36 2019 -0400
+++ b/mercurial/scmutil.py	Tue Sep 10 09:41:58 2019 -0400
@@ -319,7 +319,7 @@
     def __init__(self, ui, abort, dirstate):
         self._ui = ui
         self._abort = abort
-        allfiles = '\0'.join(dirstate._map)
+        allfiles = '\0'.join(dirstate)
         self._loweredfiles = set(encoding.lower(allfiles).split('\0'))
         self._dirstate = dirstate
         # The purpose of _newfiles is so that we don't complain about