diff -r 272b83a6b591 -r 9d78dfc78d93 mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jun 30 03:41:23 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:43:48 2017 +0200
@@ -317,6 +317,9 @@
 coreconfigitem('phases', 'checksubrepos',
     default='follow',
 )
+coreconfigitem('phases', 'new-commit',
+    default=dynamicdefault,
+)
 coreconfigitem('phases', 'publish',
     default=True,
 )