--- a/mercurial/configitems.py	Tue Oct 10 10:49:15 2017 +0200
+++ b/mercurial/configitems.py	Sun Oct 08 20:26:25 2017 +0200
@@ -99,6 +99,10 @@
 
 coreconfigitem = getitemregister(coreitems)
 
+coreconfigitem('alias', '.*',
+    default=None,
+    generic=True,
+)
 coreconfigitem('annotate', 'nodates',
     default=None,
 )