diff -r f4733654f144 -r 1c5810ce737e mercurial/revlogutils/concurrency_checker.py
--- a/mercurial/revlogutils/concurrency_checker.py	Mon Sep 16 15:36:44 2024 +0200
+++ b/mercurial/revlogutils/concurrency_checker.py	Thu Sep 12 16:27:58 2024 -0400
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from ..i18n import _
 from .. import error