diff -r 000000000000 -r 6474c204b198 js/src/tests/test262/ch11/11.4/11.4.1/S11.4.1_A5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/test262/ch11/11.4/11.4.1/S11.4.1_A5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+// Copyright 2011 Google Inc.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * A strict delete should either succeed, returning true, or it
+ * should fail by throwing a TypeError. Under no circumstances
+ * should a strict delete return false.
+ *
+ * @path ch11/11.4/11.4.1/S11.4.1_A5.js
+ * @description See if a strict delete returns false when deleting a
+ * non-standard property.
+ * @onlyStrict
+ */
+
+"use strict";
+
+var reNames = Object.getOwnPropertyNames(RegExp);
+for (var i = 0, len = reNames.length; i < len; i++) {
+  var reName = reNames[i];
+  if (reName !== 'prototype') {
+    var deleted = 'unassigned';
+    try {
+      deleted = delete RegExp[reName];
+    } catch (err) {
+      if (!(err instanceof TypeError)) {
+        $ERROR('#1: strict delete threw a non-TypeError: ' + err);
+      }
+      // fall through
+    }
+    if (deleted === false) {
+      $ERROR('#2: Strict delete returned false');
+    }
+  }
+}
+