diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug771242.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug771242.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+a = function() {
+  b = newGlobal()
+};
+c = [0, 0]
+c.sort(a)
+function d() {
+  yield arguments[4]
+}
+b.iterate = d
+f = Proxy.create(b)
+e = Iterator(f, true)
+for (p in f) {
+  e.next()
+}