--- a/mercurial/parser.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/mercurial/parser.py	Mon Sep 16 15:36:44 2024 +0200
@@ -16,6 +16,7 @@
 # an action is a tree node name, a tree label, and an optional match
 # __call__(program) parses program into a labeled tree
 
+from __future__ import annotations
 
 from .i18n import _
 from . import (