diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug713944.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug713944.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// Binary: cache/js-dbg-64-7e28cce342a6-linux
+// Flags:
+//
+function f() {
+    constructor = {}
+}
+Object.defineProperty(function() {
+    return {}.__proto__
+}(), "constructor", {
+    set: function() {}
+})
+f()
+Object.defineProperty({}.__proto__, "constructor", {
+    value: 3
+})
+f()