diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug581785.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug581785.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Binary: cache/js-dbg-64-441daac3fef9-linux
+// Flags: -j
+//
+function f() {
+    this.b = function() {};
+    this.b = Object.e;
+    Object.defineProperty(this, "b", {})
+}
+for (a in [0, 0, 0, 0]) {
+    new f
+}