diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/collections/Map-values-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/collections/Map-values-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// map.keys(), .values(), and .entries() on an empty map produce empty iterators.
+
+var m = Map();
+var ki = m.keys(), vi = m.values(), ei = m.entries();
+var p = Object.getPrototypeOf(ki)
+assertEq(Object.getPrototypeOf(vi), p);
+assertEq(Object.getPrototypeOf(ei), p);
+
+for (let k of ki)
+    throw "FAIL";
+for (let v of vi)
+    throw "FAIL";
+for (let [k, v] of ei)
+    throw "FAIL";