--- a/mercurial/revset.py	Wed Oct 14 15:11:53 2015 -0400
+++ b/mercurial/revset.py	Thu Oct 15 01:35:44 2015 +0100
@@ -12,6 +12,7 @@
 
 from .i18n import _
 from . import (
+    destutil,
     encoding,
     error,
     hbisect,
@@ -463,6 +464,11 @@
 
 # functions
 
+def _destupdate(repo, subset, x):
+    # experimental revset for update destination
+    args = getargsdict(x, 'limit', 'clean check')
+    return subset & baseset([destutil.destupdate(repo, **args)[0]])
+
 def _mergedefaultdest(repo, subset, x):
     # ``_mergedefaultdest()``
 
@@ -2142,6 +2148,7 @@
     return baseset([r for r in ls if r in s])
 
 symbols = {
+    "_destupdate": _destupdate,
     "_mergedefaultdest": _mergedefaultdest,
     "adds": adds,
     "all": getall,