diff -r 607e94e01851 -r f4733654f144 mercurial/unionrepo.py
--- a/mercurial/unionrepo.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/unionrepo.py	Mon Sep 16 15:36:44 2024 +0200
@@ -11,6 +11,8 @@
 allowing operations like diff and log with revsets.
 """
 
+from __future__ import annotations
+
 import contextlib