--- a/mercurial/phases.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/phases.py	Mon Sep 16 15:36:44 2024 +0200
@@ -100,6 +100,7 @@
 
 """
 
+from __future__ import annotations
 
 import heapq
 import struct