diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/recompile/bug658777.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/recompile/bug658777.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+function Employee(name, dept) this.name = name || "";
+function WorkerBee(name, dept, projs) {
+    this.base = Employee
+    this.base(name, dept)
+}
+function Engineer(name, projs, machine) {
+    this.base = WorkerBee
+    this.base(name, "engineering", projs)
+    __proto__["a" + constructor] = 1
+}
+new Engineer;