diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/array-iterator-surfaces-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/array-iterator-surfaces-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+// Superficial tests for iterators created by Array.prototype.iterator
+
+load(libdir + "iteration.js");
+
+var proto = Object.getPrototypeOf([][std_iterator]());
+assertEq(Object.getPrototypeOf(proto), Iterator.prototype);
+proto = Object.getPrototypeOf([].keys());
+assertEq(Object.getPrototypeOf(proto), Iterator.prototype);
+proto = Object.getPrototypeOf([].entries());
+assertEq(Object.getPrototypeOf(proto), Iterator.prototype);
+
+function check(it) {
+    assertEq(typeof it, 'object');
+    assertEq(Object.getPrototypeOf(it), proto);
+    assertEq(Object.getOwnPropertyNames(it).length, 0);
+    assertEq(it[std_iterator](), it);
+
+    // for-in enumerates the iterator's properties.
+    it.x = 0;
+    var s = '';
+    for (var p in it)
+        s += p + '.';
+    assertEq(s, 'x.');
+}
+
+check([][std_iterator]());
+check(Array.prototype[std_iterator].call({}));
+check([].keys());
+check(Array.prototype.keys.call({}));
+check([].entries());
+check(Array.prototype.entries.call({}));