diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// Nested for-of loops can iterate over a Map.
+
+var map = Map([['a', 0], ['b', 1]]);
+var log = '';
+for (let [k0, v0] of map) {
+    log += k0 + v0 + ':'
+    for (let [k1, v1] of map)
+        log += k1 + v1;
+    log += ';'
+};
+assertEq(log, 'a0:a0b1;b1:a0b1;');