diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-proxies-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-proxies-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// for-of works on a cross-compartment wrapper of a Map.
+
+var g = newGlobal();
+var mw = g.eval("Map([['a', 1], ['b', 2]])");
+var log = '';
+for (let [k, v] of mw)
+    log += k + v;
+assertEq(log, "a1b2");