diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/generators-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/generators-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// Nested for-of loops can use the same generator-iterator.
+
+function range(n) {
+    for (var i = 0; i < n; i++)
+        yield i;
+}
+
+var r = range(10);
+for (var a of r)
+    for (var b of r)
+        for (var c of r)
+            for (var d of r)
+                ;
+
+assertEq(a, 0);
+assertEq(b, 1);
+assertEq(c, 2);
+assertEq(d, 9);