diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/extensions/15.4.4.11.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/extensions/15.4.4.11.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+function arr() {
+  return Object.defineProperty([20, 10, 30], 0, {writable: false});
+}
+
+assertEq(testLenientAndStrict('var a = arr(); a.sort()',
+                              raisesException(TypeError),
+                              raisesException(TypeError)),
+         true);
+
+function obj() {
+  var o = {0: 20, 1: 10, 2: 30, length: 3};
+  Object.defineProperty(o, 0, {writable: false});
+  return o;
+}
+
+assertEq(testLenientAndStrict('var o = obj(); Array.prototype.sort.call(o)',
+                              raisesException(TypeError), 
+                              raisesException(TypeError)),
+         true);
+
+// The behavior of sort is implementation-defined if the object being
+// sorted is sparse, so I'm not sure how to test its behavior on
+// non-configurable properties.
+
+reportCompare(true, true);