diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/generators-4.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/generators-4.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+// for-of can iterate over generator-iterators produced by generator-expressions.
+
+function g() {
+    yield 1;
+    yield 2;
+}
+
+var it = g();
+for (var i = 0; i < 10; i++) {
+    let prev = it;
+    it = (k + 1 for (k of prev));
+}
+
+var arr = [v for (v of it)];
+assertEq(arr.join(), "11,12");