diff -r 662b08ac9869 -r d4e30c15626d mercurial/testing/ps_util.py
--- a/mercurial/testing/ps_util.py	Fri Nov 29 19:11:30 2024 -0500
+++ b/mercurial/testing/ps_util.py	Fri Nov 29 19:18:33 2024 -0500
@@ -1,5 +1,8 @@
 # This python code can be imported into tests in order to terminate a process
 # with signal.SIGKILL on posix, or a roughly equivalent procedure on Windows.
+
+from __future__ import annotations
+
 import os
 import signal
 import subprocess