diff -r c59eb1560c44 -r 1f339b503a40 mercurial/repoview.py
--- a/mercurial/repoview.py	Sun Oct 06 16:55:18 2019 -0400
+++ b/mercurial/repoview.py	Sun Oct 06 16:58:55 2019 -0400
@@ -13,6 +13,7 @@
 
 from .node import nullrev
 from .pycompat import (
+    delattr,
     getattr,
     setattr,
 )