diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug524826.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug524826.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+var x = 42;
+function f() {
+    var a = [new Date, new Date, new Date, new Date, new Date];
+    for (var i = 0; i < 5; i++)
+        a[i].m = function () {return x};
+    for (i = 0; i < 4; i++)
+        if (a[i].m == a[i+1].m)
+            throw "FAIL!";
+}
+f();