diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-iterator-pairs-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-iterator-pairs-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+// mapiter.next() returns an actual array.
+
+load(libdir + "iteration.js");
+
+var key = {};
+var map = Map([[key, 'value']]);
+var entry = map[std_iterator]().next().value;
+assertEq(Array.isArray(entry), true);
+assertEq(Object.getPrototypeOf(entry), Array.prototype);
+assertEq(Object.isExtensible(entry), true);
+
+assertEq(entry.length, 2);
+var names = Object.getOwnPropertyNames(entry).sort();
+assertEq(names.length, 3);
+assertEq(names.join(","), "0,1,length");
+assertEq(entry[0], key);
+assertEq(entry[1], 'value');