diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug678234.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug678234.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+a = {}
+function f(o) {
+    for (x in o) {
+        print
+    }
+}
+for (var i = 0; i < 3; i++) {
+    new f(a)
+    a.__proto__ = null
+}