diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/jaeger/bug704138.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/jaeger/bug704138.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+function TestCase(n, d, e, a)
+  this.name=n;
+function reportCompare (expected, actual, description) {
+  new TestCase
+}
+reportCompare(true, "isGenerator" in Function, "Function.prototype.isGenerator present");
+var p = Proxy.create({
+    has : function(id) {}
+});
+function test() {
+    Object.prototype.__proto__=null
+    if (new TestCase)
+        Object.prototype.__proto__=p
+}
+test();
+new TestCase;
+test()