diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/semantics-11.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/semantics-11.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+// for-of on a proxy causes a predictable sequence of trap calls.
+
+load(libdir + "iteration.js");
+
+var s = '';
+
+var i = 0;
+var next_fn = Proxy.createFunction({}, function () {
+    s += "n";
+    if (i == 3)
+        return { value: undefined, done: true };
+    return { value: i++, done: false };
+});
+
+var it = Proxy.create({
+    get: function (receiver, name) {
+        if (name == 'toSource') {
+            s += '?';
+            return function () 'it';
+        }
+        assertEq(name, "next");
+        s += "N";
+        return next_fn;
+    }
+});
+
+var iterator_fn = Proxy.createFunction({}, function () {
+    s += 'i';
+    return it;
+});
+
+var obj = Proxy.create({
+    get: function (receiver, name) {
+        assertEq(name, std_iterator);
+        s += "I";
+        return iterator_fn;
+    }
+});
+
+for (var v of obj)
+    s += v;
+
+assertEq(s, 'IiNn0Nn1Nn2Nn');