--- a/mercurial/graphmod.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/graphmod.py	Mon Sep 16 15:36:44 2024 +0200
@@ -17,6 +17,7 @@
 Data depends on type.
 """
 
+from __future__ import annotations
 
 import typing