diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-global-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-global-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+// Debugger.Object.prototype.global retrieves the correct global.
+
+var dbg = new Debugger;
+var g1 = newGlobal();
+var g1w = dbg.addDebuggee(g1);
+var g2 = newGlobal();
+var g2w = dbg.addDebuggee(g2);
+
+assertEq(g1w === g2w, false);
+assertEq(g1w.global, g1w);
+assertEq(g2w.global, g2w);
+
+var g1ow = g1w.makeDebuggeeValue(g1.Object());
+var g2ow = g2w.makeDebuggeeValue(g2.Object());
+assertEq(g1ow.global, g1w);
+assertEq(g2ow.global, g2w);
+
+// mild paranoia
+assertEq(g1ow.global === g1ow, false);
+assertEq(g2ow.global === g2ow, false);
+
+// The .global accessor doesn't unwrap.
+assertEq(g1w.makeDebuggeeValue(g2.Object()).global, g1w);
+assertEq(g2w.makeDebuggeeValue(g1.Object()).global, g2w);
+