diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testArgumentsOptimizationFailCornerCase.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testArgumentsOptimizationFailCornerCase.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+Object.prototype.blah = 42;
+
+function g(a,b,c) {
+    assertEq(a, 1);
+    assertEq(b, 2);
+    assertEq(c, 3);
+    return 43;
+}
+
+function f() {
+    var a = arguments;
+    var b = a;
+    var s = "blah";
+    assertEq(a[s], 42);
+    assertEq(b[s], 42);
+    assertEq(a[s], 42);
+    assertEq(b.length, 3);
+    assertEq(a.length, 3);
+    assertEq(g.apply(null, b), 43);
+}
+
+for (var i = 0; i < 10; ++i)
+    f(1,2,3);