--- a/mercurial/upgrade_utils/actions.py	Sun Jan 05 22:26:16 2025 -0500
+++ b/mercurial/upgrade_utils/actions.py	Mon Jan 06 00:30:55 2025 -0500
@@ -110,7 +110,7 @@
     compatible_with_share = False
 
 
-allformatvariant: List[Type['formatvariant']] = []
+allformatvariant: List[Type[formatvariant]] = []
 
 
 def registerformatvariant(cls):