diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/array-iterator-generic.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/array-iterator-generic.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+// Array.prototype.iterator is generic.
+// That is, it can be applied to arraylike objects and strings, not just arrays.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+function test(obj) {
+    var it = Array.prototype[std_iterator].call(obj);
+    var ki = Array.prototype.keys.call(obj);
+    var ei = Array.prototype.entries.call(obj);
+    for (var i = 0; i < (obj.length >>> 0); i++) {
+        assertIteratorNext(it, obj[i]);
+        assertIteratorNext(ki, i);
+        assertIteratorNext(ei, [i, obj[i]]);
+    }
+    assertIteratorDone(it, undefined);
+    assertIteratorDone(ki, undefined);
+    assertIteratorDone(ei, undefined);
+}
+
+test({length: 0});
+test({length: 0, 0: 'x', 1: 'y'});
+test({length: 2, 0: 'x', 1: 'y'});
+test(Object.create(['x', 'y', 'z']));
+test(Object.create({length: 2, 0: 'x', 1: 'y'}));
+test("");
+test("ponies");
+
+// Perverse length values.
+test({length: 0x1f00000000});
+test({length: -0xfffffffe, 0: 'a', 1: 'b'});
+test({length: "011", 9: 9, 10: 10, 11: 11});
+test({length: -0});
+test({length: 2.7, 0: 0, 1: 1, 2: 2});
+test({length: {valueOf: function () { return 3; }}, 0: 0, 1: 1, 2: 2});