diff -r c59eb1560c44 -r 1f339b503a40 mercurial/vfs.py
--- a/mercurial/vfs.py	Sun Oct 06 16:55:18 2019 -0400
+++ b/mercurial/vfs.py	Sun Oct 06 16:58:55 2019 -0400
@@ -15,6 +15,7 @@
 
 from .i18n import _
 from .pycompat import (
+    delattr,
     getattr,
     setattr,
 )