diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Object-proto.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Object-proto.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+// Debugger.Object.prototype.proto
+var g = newGlobal();
+var dbgeval = function () {
+        var dbg = new Debugger(g);
+        var hits = 0;
+        g.eval("function f() { debugger; }");
+        var lastval;
+        dbg.onDebuggerStatement = function (frame) { lastval = frame.arguments[0]; };
+        return function dbgeval(s) {
+            g.eval("f(" + s + ");");
+            return lastval;
+        };
+    }();
+
+var Op = dbgeval("Object.prototype");
+assertEq(Op.proto, null);
+assertEq(dbgeval("({})").proto, Op);
+
+var Ap = dbgeval("[]").proto;
+assertEq(Ap, dbgeval("Array.prototype"));
+assertEq(Ap.proto, Op);
+
+assertEq(dbgeval("Object").proto, dbgeval("Function.prototype"));