diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/proxy/testDirectProxySet5.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/proxy/testDirectProxySet5.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// Reflect side-effects from the trap
+var target = {
+    foo: 'bar'
+};
+new Proxy(target, {
+    set: function (target, name, val, receiver) {
+        target[name] = 'qux';
+    }
+})['foo'] = 'baz';
+assertEq(target['foo'], 'qux');