diff -r abac7983d28e -r 74b41e8b3d9c mercurial/copies.py
--- a/mercurial/copies.py	Sun Dec 12 22:09:13 2021 -0500
+++ b/mercurial/copies.py	Sun Dec 12 22:24:16 2021 -0500
@@ -246,7 +246,6 @@
         return {}
 
     repo = a.repo().unfiltered()
-    children = {}
 
     cl = repo.changelog
     isancestor = cl.isancestorrev