diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/proxy/testDirectProxyHas3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/proxy/testDirectProxyHas3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the trap reports a non-configurable own property as
+ * non-existent
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    configurable: false
+});
+var caught = false;
+assertThrowsInstanceOf(function () {
+    'foo' in new Proxy(target, {
+        has: function (target, name) {
+            return false;
+        }
+    });
+}, TypeError);