diff -r 55d132525155 -r 642e31cb55f0 mercurial/parser.py
--- a/mercurial/parser.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/parser.py	Mon Feb 21 13:08:28 2022 -0700
@@ -25,7 +25,7 @@
 from .utils import stringutil
 
 
-class parser(object):
+class parser:
     def __init__(self, elements, methods=None):
         self._elements = elements
         self._methods = methods
@@ -415,7 +415,7 @@
         return inst.message
 
 
-class alias(object):
+class alias:
     """Parsed result of alias"""
 
     def __init__(self, name, args, err, replacement):
@@ -429,7 +429,7 @@
         self.warned = False
 
 
-class basealiasrules(object):
+class basealiasrules:
     """Parsing and expansion rule set of aliases
 
     This is a helper for fileset/revset/template aliases. A concrete rule set