mercurial/configitems.py

--- a/mercurial/configitems.py	Fri Nov 29 15:36:45 2019 +0100
+++ b/mercurial/configitems.py	Sun Sep 29 16:00:32 2019 +0200
@@ -706,6 +706,9 @@
     b'experimental', b'worker.wdir-get-thread-safe', default=False,
 )
 coreconfigitem(
+    b'experimental', b'worker.repository-upgrade', default=False,
+)
+coreconfigitem(
     b'experimental', b'xdiff', default=False,
 )
 coreconfigitem(