diff -r ac11ba7c2e56 -r dcb4209bd30d mercurial/dispatch.py
--- a/mercurial/dispatch.py	Tue Mar 08 23:04:53 2016 +0900
+++ b/mercurial/dispatch.py	Tue Mar 08 23:04:53 2016 +0900
@@ -33,6 +33,7 @@
     fancyopts,
     hg,
     hook,
+    revset,
     ui as uimod,
     util,
 )
@@ -752,6 +753,7 @@
 #   extraobj) arguments
 extraloaders = [
     ('cmdtable', commands, 'loadcmdtable'),
+    ('revsetpredicate', revset, 'loadpredicate'),
 ]
 
 def _dispatch(req):