diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-defineProperty-09.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-defineProperty-09.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+// defineProperty can't re-define non-configurable properties.
+// Also: when defineProperty throws, the exception is native to the debugger
+// compartment, not a wrapper.
+
+var g = newGlobal();
+var dbg = new Debugger;
+var gw = dbg.addDebuggee(g);
+gw.defineProperty("p", {value: 1});
+g.p = 4;
+assertEq(g.p, 1);
+
+var threw;
+try {
+    gw.defineProperty("p", {value: 2});
+    threw = false;
+} catch (exc) {
+    threw = true;
+    assertEq(exc instanceof TypeError, true);
+    assertEq(typeof exc.message, "string");
+    assertEq(typeof exc.stack, "string");
+}
+assertEq(threw, true);
+
+assertEq(g.p, 1);