diff -r 99c3dee3f6ce -r cbda631c1dde mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jun 30 03:43:13 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:37:05 2017 +0200
@@ -107,6 +107,9 @@
 coreconfigitem('commands', 'update.requiredest',
     default=False,
 )
+coreconfigitem('debug', 'dirstate.delaywrite',
+    default=0,
+)
 coreconfigitem('devel', 'all-warnings',
     default=False,
 )