--- a/mercurial/repair.py Wed Feb 10 09:45:48 2021 -0800
+++ b/mercurial/repair.py Wed Feb 10 09:49:50 2021 -0800
@@ -308,6 +308,7 @@
if not tostrip:
return None
+ backupfile = None
if backup:
node = tostrip[0]
backupfile = _createstripbackup(repo, tostrip, node, topic)