diff -r cd62532c62a1 -r 174d9b8baf5d mercurial/fileset.py
--- a/mercurial/fileset.py	Mon Dec 23 15:29:51 2013 -0800
+++ b/mercurial/fileset.py	Wed Jan 01 18:28:40 2014 -0500
@@ -79,7 +79,9 @@
         pos += 1
     yield ('end', None, pos)
 
-parse = parser.parser(tokenize, elements).parse
+def parse(expr):
+    p = parser.parser(tokenize, elements)
+    return p.parse(expr)
 
 def getstring(x, err):
     if x and (x[0] == 'string' or x[0] == 'symbol'):