diff -r 55d132525155 -r 642e31cb55f0 contrib/perf.py
--- a/contrib/perf.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/contrib/perf.py	Mon Feb 21 13:08:28 2022 -0700
@@ -369,7 +369,7 @@
     return len
 
 
-class noop(object):
+class noop:
     """dummy context manager"""
 
     def __enter__(self):
@@ -413,7 +413,7 @@
         # available since 2.2 (or ae5f92e154d3)
         from mercurial import node
 
-        class defaultformatter(object):
+        class defaultformatter:
             """Minimized composition of baseformatter and plainformatter"""
 
             def __init__(self, ui, topic, opts):
@@ -652,7 +652,7 @@
 
     origvalue = getattr(obj, _sysstr(name))
 
-    class attrutil(object):
+    class attrutil:
         def set(self, newvalue):
             setattr(obj, _sysstr(name), newvalue)
 
@@ -2942,7 +2942,7 @@
     fm.end()
 
 
-class _faketr(object):
+class _faketr:
     def add(s, x, y, z=None):
         return None