--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/NASHORN-251.js	Fri Dec 21 16:36:24 2012 -0400
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * NASHORN-251 : Global built-in constructor prototypes are destroyed by user assignments.
+ *
+ * @test
+ * @run
+ */
+
+// assign to global "Array"
+Array = 3;
+// we can create literal array
+x = [23, 33];
+if (x.join("-") !== '23-33') {
+    fail("x.join('-') !== '23-33'");
+}
+
+try {
+    new Array();
+    fail("should have thrown TypeError for 'Array' constructor!");
+} catch (e) {
+    if (! (e instanceof TypeError)) {
+        fail("should have thrown TypeError, got " + e);
+    }
+}
+
+// assign to global "RegExp"
+RegExp = true;
+// we can still create RegExp literal
+y = /foo/;
+if (! y.test("foo")) {
+   fail("y.test('foo') is not true");
+}
+
+try {
+    new RegExp();
+    fail("should have thrown TypeError for 'RegExp' constructor!");
+} catch (e) {
+    if (! (e instanceof TypeError)) {
+        fail("should have thrown TypeError, got " + e);
+    }
+}
+
+TypeError = "foo";
+try {
+    var foo = 3;
+    foo();
+} catch(e) {
+    if (! (e instanceof Error)) {
+        fail("Error subtype expected, got " + e);
+    }
+
+    if (e.name !== 'TypeError') {
+        fail("e is not of type 'TypeError'");
+    }
+}
+
+SyntaxError = 234;
+try {
+    eval("344**++33");
+} catch(e) {
+    if (! (e instanceof Error)) {
+        fail("Error subtype expected, got " + e);
+    }
+
+    if (e.name !== 'SyntaxError') {
+        fail("e is not of type 'SyntaxError'");
+    }
+}
+
+ReferenceError = "foo";
+try {
+    print(unknown);
+} catch(e) {
+    if (! (e instanceof Error)) {
+        fail("Error subtype expected, got " + e);
+    }
+
+    if (e.name !== 'ReferenceError') {
+        fail("e is not of type 'ReferenceError'");
+    }
+}