[es6] support rest parameters in arrow functions (alternative)

test/mjsunit/harmony/rest-params.js

Index: test/mjsunit/harmony/rest-params.js
diff --git a/test/mjsunit/harmony/rest-params.js b/test/mjsunit/harmony/rest-params.js
index 5bb258ee68ede31e86a6554f2756f00e01b4ac90..366277b2c1b2dbbfd6c95789f1748cc8fb26e705 100644
--- a/test/mjsunit/harmony/rest-params.js
+++ b/test/mjsunit/harmony/rest-params.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-rest-parameters
+// Flags: --harmony-rest-parameters --harmony-arrow-functions
 
 (function testRestIndex() {
   assertEquals(5, (function(...args) { return args.length; })(1,2,3,4,5));
@@ -166,7 +166,6 @@ var O = {
 })();
 
 
-/* TODO(caitp): support arrow functions (blocked on spread operator support)
 (function testRestParamsArrowFunctions() {
   "use strict";
 
@@ -179,4 +178,4 @@ var O = {
   assertThrows("var x = ...y => y;", SyntaxError);
   assertEquals([], ((...args) => args)());
   assertEquals([1,2,3], ((...args) => args)(1,2,3));
-})();*/
+})();