diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug560566.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug560566.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// Binary: cache/js-dbg-64-58c9dd4f0c1f-linux
+// Flags:
+//
+var o = {}
+Object.defineProperty(o, "x", {get: undefined, set: function() { Object.defineProperty(o, "x", {set: function() { }}); }, configurable: true});
+o.a = 0;
+o.x = 0;