diff -r 7d2f71b7bc31 -r 7de145167ae7 mercurial/configitems.py
--- a/mercurial/configitems.py	Sun Oct 01 16:46:02 2017 +0100
+++ b/mercurial/configitems.py	Fri Jun 30 03:43:55 2017 +0200
@@ -335,6 +335,9 @@
 coreconfigitem('profiling', 'nested',
     default=0,
 )
+coreconfigitem('profiling', 'output',
+    default=None,
+)
 coreconfigitem('profiling', 'sort',
     default='inlinetime',
 )