--- a/mercurial/changelog.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/changelog.py	Fri Nov 08 11:19:20 2019 -0800
@@ -211,10 +211,10 @@
     """
 
     __slots__ = (
-        r'_offsets',
-        r'_text',
-        r'_sidedata',
-        r'_cpsd',
+        '_offsets',
+        '_text',
+        '_sidedata',
+        '_cpsd',
     )
 
     def __new__(cls, text, sidedata, cpsd):