diff -r 55d132525155 -r 642e31cb55f0 mercurial/graphmod.py
--- a/mercurial/graphmod.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/graphmod.py	Mon Feb 21 13:08:28 2022 -0700
@@ -358,7 +358,7 @@
 
 
 @attr.s
-class asciistate(object):
+class asciistate:
     """State of ascii() graph rendering"""
 
     seen = attr.ib(init=False, default=attr.Factory(list))