diff -r 14e374d4c9ee -r 70d42e2ad9b4 mercurial/util.py
--- a/mercurial/util.py	Wed Nov 06 14:12:53 2019 -0500
+++ b/mercurial/util.py	Wed Nov 06 17:46:26 2019 -0500
@@ -1304,7 +1304,7 @@
     """
 
 
-class transactional(object):
+class transactional(object):  # pytype: disable=ignored-metaclass
     """Base class for making a transactional type into a context manager."""
 
     __metaclass__ = abc.ABCMeta