--- a/mercurial/revset.py	Mon Jan 09 15:15:21 2017 +0900
+++ b/mercurial/revset.py	Mon Jan 09 15:25:52 2017 +0900
@@ -326,7 +326,7 @@
     return l
 
 def getargsdict(x, funcname, keys):
-    return parser.buildargsdict(getlist(x), funcname, keys.split(),
+    return parser.buildargsdict(getlist(x), funcname, parser.splitargspec(keys),
                                 keyvaluenode='keyvalue', keynode='symbol')
 
 def getset(repo, subset, x):