diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/ion/bug770332.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/ion/bug770332.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+function TestCase(n, d, e, a) {}
+function reportCompare (expected, actual, description) {
+  var testcase = new TestCase("unknown-test-name", description, expected, actual);
+}
+var status = 'Testing scope after changing obj.__proto__';
+function test() {
+  let ( actual = [ ]  ) TestCase   .__proto__ = null;
+  reportCompare (expect, actual, status);
+}
+var actual = 'error';
+var expect = 'error';
+for (i = 0; i < 12000; i++)  {
+  test();
+}