diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/proxy/testDirectProxyKeys6.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/proxy/testDirectProxyKeys6.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+load(libdir + "asserts.js");
+
+// Throw a TypeError if the trap skips a non-configurable enumerable property
+var target = {};
+Object.defineProperty(target, 'foo', {
+    enumerable: true,
+    configurable: false
+});
+assertThrowsInstanceOf(function () {
+    Object.getOwnPropertyNames(new Proxy(target, {
+        getOwnPropertyNames: function (target) {
+            return [];
+        }
+    }));
+}, TypeError);