diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arguments/args6a.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arguments/args6a.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+actual = '';
+expected = '5,';
+
+// tracing length
+
+var g = 0;
+
+function h(args) {
+  for (var i = 0; i < 6; ++i)
+    g = args.length;
+}
+
+function f() {
+  h(arguments);
+}
+
+for (var i = 0; i < 5; ++i) {
+  f(10, 20, 30, 40, 50);
+}
+appendToActual(g);
+
+
+assertEq(actual, expected)