diff -r cf5b47b885b1 -r c28ba6fb3fae mercurial/policy.py
--- a/mercurial/policy.py	Sat Nov 30 19:12:02 2024 +0100
+++ b/mercurial/policy.py	Fri Nov 29 22:59:16 2024 +0100
@@ -145,7 +145,7 @@
     if not policy.startswith(b'rust'):
         return default
 
-    dlib_name = "pyo3-rustext" if pyo3 else "rustext"
+    dlib_name = "pyo3_rustext" if pyo3 else "rustext"
 
     try:
         mod = _importfrom(dlib_name, modname)