diff -r 47fac1692ede -r 9f70512ae2cf mercurial/vfs.py
--- a/mercurial/vfs.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/vfs.py	Fri Nov 08 11:19:20 2019 -0800
@@ -592,7 +592,7 @@
     """
 
     def __init__(self, fh):
-        object.__setattr__(self, r'_origfh', fh)
+        object.__setattr__(self, '_origfh', fh)
 
     def __getattr__(self, attr):
         return getattr(self._origfh, attr)
@@ -622,7 +622,7 @@
 
     def __init__(self, fh, closer):
         super(delayclosedfile, self).__init__(fh)
-        object.__setattr__(self, r'_closer', closer)
+        object.__setattr__(self, '_closer', closer)
 
     def __exit__(self, exc_type, exc_value, exc_tb):
         self._closer.close(self._origfh)
@@ -736,7 +736,7 @@
 
     def __init__(self, fh):
         super(checkambigatclosing, self).__init__(fh)
-        object.__setattr__(self, r'_oldstat', util.filestat.frompath(fh.name))
+        object.__setattr__(self, '_oldstat', util.filestat.frompath(fh.name))
 
     def _checkambig(self):
         oldstat = self._oldstat