diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-pairs-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-pairs-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,13 @@
+// mapiter.next() returns a fresh array each time.
+
+load(libdir + "iteration.js");
+
+var map = Map([['a', 1], ['b', 2]]);
+var iter = map[std_iterator]();
+var a = iter.next(), b = iter.next();
+assertIteratorResult(a, ['a', 1], false);
+assertIteratorResult(b, ['b', 2], false);
+assertEq(a.value !== b.value, true);
+var a1 = map[std_iterator]();
+assertIteratorNext(a1, ['a', 1]);
+assertEq(a.value !== a1.value, true);