diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/uncaughtExceptionHook-resumption-03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/uncaughtExceptionHook-resumption-03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// After an onExceptionUnwind hook throws, if uncaughtExceptionHook returns
+// undefined, the original exception continues to propagate.
+
+var g = newGlobal();
+var dbg = new Debugger(g);
+var log = '';
+dbg.onExceptionUnwind = function () { log += "1"; throw new Error("oops"); };
+dbg.uncaughtExceptionHook = function () { log += "2"; };
+
+g.eval("var x = new Error('oops');");
+g.eval("try { throw x; } catch (exc) { assertEq(exc, x); }");
+assertEq(log, "12");