--- a/mercurial/mergestate.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/mergestate.py	Mon Sep 16 15:36:44 2024 +0200
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import collections
 import shutil
 import struct