diff -r ef3838a47503 -r be4984261611 mercurial/configitems.py
--- a/mercurial/configitems.py	Wed Jul 18 09:46:45 2018 -0700
+++ b/mercurial/configitems.py	Wed Jul 18 09:49:34 2018 -0700
@@ -623,6 +623,9 @@
 coreconfigitem('experimental', 'web.api.debugreflect',
     default=False,
 )
+coreconfigitem('experimental', 'worker.wdir-get-thread-safe',
+    default=False,
+)
 coreconfigitem('experimental', 'xdiff',
     default=False,
 )