diff -r 0d840b9d200d -r 34827c95092c mercurial/copies.py
--- a/mercurial/copies.py	Tue Dec 15 18:04:23 2020 +0100
+++ b/mercurial/copies.py	Tue Dec 15 18:22:57 2020 +0100
@@ -363,7 +363,7 @@
 
     if rustmod is not None:
         final_copies = rustmod.combine_changeset_copies(
-            list(revs), children_count, targetrev, revinfo, isancestor
+            list(revs), children_count, targetrev, revinfo
         )
     else:
         isancestor = cached_is_ancestor(isancestor)