diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Debugger-debuggees-21.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Debugger-debuggees-21.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Errors adding globals in addAllGlobalsAsDebuggees should be reported.
+
+// The exception that might be thrown in this test reflects our inability
+// to change compartments to debug mode while they have frames on the
+// stack. If we run this test with --debugjit, it won't throw an error at
+// all, since all compartments are already in debug mode. So, pass if the
+// script completes normally, or throws an appropriate exception.
+try {
+  newGlobal().eval("(new Debugger).addAllGlobalsAsDebuggees();");
+} catch (ex) {
+  assertEq(!!(''+ex).match(/can't start debugging: a debuggee script is on the stack/), true);
+}