diff -r 728ecab6634b -r 54d916833ca5 mercurial/configitems.py
--- a/mercurial/configitems.py	Wed Oct 11 03:49:47 2017 +0200
+++ b/mercurial/configitems.py	Wed Oct 11 03:50:14 2017 +0200
@@ -377,6 +377,9 @@
 coreconfigitem('logtoprocess', 'command',
     default=None,
 )
+coreconfigitem('logtoprocess', 'develwarn',
+    default=None,
+)
 coreconfigitem('merge', 'checkunknown',
     default='abort',
 )