diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-multi-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-multi-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+// Q: But who shall debug the debuggers?  A: jimb
+
+var log = '';
+
+function addDebug(g, id) {
+    var debuggerGlobal = newGlobal();
+    debuggerGlobal.debuggee = g;
+    debuggerGlobal.id = id;
+    debuggerGlobal.print = function (s) { log += s; };
+    debuggerGlobal.eval(
+        'var dbg = new Debugger(debuggee);\n' +
+        'dbg.onDebuggerStatement = function () { print(id); debugger; print(id); };\n');
+    return debuggerGlobal;
+}
+
+var base = newGlobal();
+var top = base;
+for (var i = 0; i < 8; i++)  // why have 2 debuggers when you can have 8
+    top = addDebug(top, i);
+base.eval("debugger;");
+assertEq(log, '0123456776543210');