diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBrandedVsGeneric.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBrandedVsGeneric.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+const C = function (a, b, c) {
+    return function C() {
+        this.m1 = function () a;
+        this.m2 = function () b;
+        this.m3 = function () c;
+    }
+}(2,3,4);
+var c = new C();
+var d = function (e) {return {m0: function () e}}(5);
+for (var i = 0; i < 5; i++)
+    d.m0();
+C.call(d);
+d.__iterator__ = function() {yield 55};
+for (i = 0; i < 5; i++) {
+    for (j in d)
+        print(j);
+}