diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-global-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-global-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+// Debugger.Object.prototype.global accessor surfaces.
+
+load(libdir + 'asserts.js');
+
+var dbg = new Debugger;
+var g = newGlobal();
+var gw = dbg.addDebuggee(g);
+
+assertEq(Object.getOwnPropertyDescriptor(gw, 'global'), undefined);
+var d = Object.getOwnPropertyDescriptor(Object.getPrototypeOf(gw), 'global');
+assertEq(d.enumerable, false);
+assertEq(d.configurable, true);
+assertEq(typeof d.get, "function");
+assertEq(d.get.length, 0);
+assertEq(d.set, undefined);
+
+// This should not throw.
+gw.global = '';
+
+// This should throw.
+assertThrowsInstanceOf(function () { "use strict"; gw.global = {}; }, TypeError);
+assertEq(gw.global, gw);
+
+// You shouldn't be able to apply the accessor to the prototype.
+assertThrowsInstanceOf(function () { return Debugger.Object.prototype.global; },
+                       TypeError);