# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2010-06-19 18:00:08
# Node ID 42408cd43f55be6d24ada3a41bc4261b15c94384
# Parent  bf5d88c466e0bc5632c8d54a0d408d81eb9e366b

revset: fix up contains/getstring when no args passed

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -87,7 +87,7 @@ def tokenize(program):
 # helpers
 
 def getstring(x, err):
-    if x[0] == 'string' or x[0] == 'symbol':
+    if x and (x[0] == 'string' or x[0] == 'symbol'):
         return x[1]
     raise error.ParseError(err)
 
@@ -278,7 +278,7 @@ def hasfile(repo, subset, x):
     return s
 
 def contains(repo, subset, x):
-    pat = getstring(x, _("file wants a pattern"))
+    pat = getstring(x, _("contains wants a pattern"))
     m = _match.match(repo.root, repo.getcwd(), [pat])
     s = []
     if m.files() == [pat]: