diff -r 47fac1692ede -r 9f70512ae2cf mercurial/revlog.py
--- a/mercurial/revlog.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/revlog.py	Fri Nov 08 11:19:20 2019 -0800
@@ -102,9 +102,9 @@
 REVIDX_FLAGS_ORDER
 REVIDX_RAWTEXT_CHANGING_FLAGS
 
-parsers = policy.importmod(r'parsers')
-rustancestor = policy.importrust(r'ancestor')
-rustdagop = policy.importrust(r'dagop')
+parsers = policy.importmod('parsers')
+rustancestor = policy.importrust('ancestor')
+rustdagop = policy.importrust('dagop')
 
 # Aliased for performance.
 _zlibdecompress = zlib.decompress
@@ -556,11 +556,11 @@
 
     def _indexfp(self, mode=b'r'):
         """file object for the revlog's index file"""
-        args = {r'mode': mode}
+        args = {'mode': mode}
         if mode != b'r':
-            args[r'checkambig'] = self._checkambig
+            args['checkambig'] = self._checkambig
         if mode == b'w':
-            args[r'atomictemp'] = True
+            args['atomictemp'] = True
         return self.opener(self.indexfile, **args)
 
     def _datafp(self, mode=b'r'):