diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_5/regress/regress-601399.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_5/regress/regress-601399.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ *
+ * Test courtesy of Olov Lassus <olov.lassus@gmail.com>.
+ */
+
+function keys(o) {
+    var a = [];
+    for (var key in o) {
+        a.push(key);
+    }
+    return a;
+}
+
+var obj = {
+    'a': function() {}, 'b': function() {}, 'c': function() {}
+};
+var orig_order = keys(obj).toString();
+var tmp = obj["b"];
+var read_order = keys(obj).toString();
+
+reportCompare(orig_order, read_order,
+              "property enumeration order should not change after reading a method value");