diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/parallel/arguments-length.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/parallel/arguments-length.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+load(libdir + "parallelarray-helpers.js");
+
+if (getBuildConfiguration().parallelJS) {
+  assertParallelExecSucceeds(
+    function (m) {
+      return Array.buildPar(minItemsTestingThreshold,
+                            function (i) { return arguments.length; },
+                            m);
+    },
+    function (r) {
+      assertStructuralEq(Array.build(minItemsTestingThreshold,
+                                     function (i) { return arguments.length }),
+                         r);
+    });
+}