diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/strict/regress-599159.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/strict/regress-599159.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- 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/
+ */
+
+// Shu's test
+function test(makeNonArray) {
+    function C() {}
+    C.prototype = []
+    if (makeNonArray)
+        C.prototype.constructor = C
+    c = new C();
+    c.push("foo");
+    return c.length
+}
+assertEq(test(true), 1);
+assertEq(test(false), 1);
+
+// jorendorff's longer test
+var a = [];
+a.slowify = 1;
+var b = Object.create(a);
+b.length = 12;
+assertEq(b.length, 12);
+
+// jorendorff's shorter test
+var b = Object.create(Array.prototype);
+b.length = 12;
+assertEq(b.length, 12);
+
+reportCompare(true, true);