diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/argumentsOptimize-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/argumentsOptimize-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+
+function bar() {
+  foo.arguments.length = 10;
+}
+
+function foo(x) {
+  var a = arguments;
+  var n = 0;
+  bar();
+  assertEq(x, 5);
+  assertEq(a.length, 1);
+}
+
+foo(5);