--- a/hgext/extdiff.py	Mon Sep 16 15:36:38 2024 +0200
+++ b/hgext/extdiff.py	Mon Sep 16 15:36:44 2024 +0200
@@ -81,6 +81,7 @@
 pretty fast (at least faster than having to compare the entire tree).
 '''
 
+from __future__ import annotations
 
 import os
 import re