diff -r 55d132525155 -r 642e31cb55f0 mercurial/copies.py
--- a/mercurial/copies.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/copies.py	Mon Feb 21 13:08:28 2022 -0700
@@ -887,7 +887,7 @@
             copy[dst] = src
 
 
-class branch_copies(object):
+class branch_copies:
     """Information about copies made on one side of a merge/graft.
 
     "copy" is a mapping from destination name -> source name,