--- a/mercurial/utils/memorytop.py	Mon Sep 16 15:36:44 2024 +0200
+++ b/mercurial/utils/memorytop.py	Thu Sep 12 16:27:58 2024 -0400
@@ -5,6 +5,8 @@
 # memorytop in strategic places to show the current memory use by allocation
 # site.
 
+from __future__ import annotations
+
 import gc
 import tracemalloc