diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/array-iterator-proxy.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/array-iterator-proxy.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+// An array iterator for a proxy calls the traps in a predictable order.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+var s = '';
+
+var proxyObj = {
+    get: function (recipient, name) {
+        if (name == 'length') {
+            s += 'L';
+            return 2;
+        } else {
+            s += name;
+            return name;
+        }
+    }
+};
+
+var it = Array.prototype[std_iterator].call(Proxy.create(proxyObj));
+
+assertIteratorNext(it, "0");
+s += ' ';
+assertIteratorNext(it, "1");
+s += ' ';
+assertIteratorDone(it, undefined);
+assertEq(s, "L0 L1 L");
+
+s = '';
+var ki = Array.prototype.keys.call(Proxy.create(proxyObj));
+
+assertIteratorNext(ki, 0);
+s += ' ';
+assertIteratorNext(ki, 1);
+s += ' ';
+assertIteratorDone(ki, undefined);
+assertEq(s, "L L L");
+
+s = '';
+var ei = Array.prototype.entries.call(Proxy.create(proxyObj));
+
+assertIteratorNext(ei, [0, "0"]);
+s += ' ';
+assertIteratorNext(ei, [1, "1"]);
+s += ' ';
+assertIteratorDone(ei, undefined);
+assertEq(s, "L0 L1 L");