diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-defineProperty-11.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-defineProperty-11.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// obj.defineProperty works when obj's referent is a wrapper.
+
+var x = {};
+var g = newGlobal();
+g.x = x;
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+var xw = gw.getOwnPropertyDescriptor("x").value;
+xw.defineProperty("p", {configurable: true, enumerable: true, writable: true, value: gw});
+assertEq(x.p, g);
+
+var desc = Object.getOwnPropertyDescriptor(x, "p");
+assertEq(desc.configurable, true);
+assertEq(desc.enumerable, true);
+assertEq(desc.writable, true);
+assertEq(desc.value, g);