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diff --git a/js/src/tests/ecma/Number/15.7.4.2-3-n.js b/js/src/tests/ecma/Number/15.7.4.2-3-n.js
new file mode 100644
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+++ b/js/src/tests/ecma/Number/15.7.4.2-3-n.js
@@ -0,0 +1,39 @@
+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          15.7.4.2-3-n.js
+   ECMA Section:       15.7.4.2.1 Number.prototype.toString()
+   Description:
+   If the radix is the number 10 or not supplied, then this number value is
+   given as an argument to the ToString operator; the resulting string value
+   is returned.
+
+   If the radix is supplied and is an integer from 2 to 36, but not 10, the
+   result is a string, the choice of which is implementation dependent.
+
+   The toString function is not generic; it generates a runtime error if its
+   this value is not a Number object. Therefore it cannot be transferred to
+   other kinds of objects for use as a method.
+
+   Author:             christine@netscape.com
+   Date:               16 september 1997
+*/
+var SECTION = "15.7.4.2-3-n";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " Number.prototype.toString()");
+
+DESCRIPTION = "o = new String(); o.toString = Number.prototype.toString; o.toString()";
+EXPECTED = "error";
+
+new TestCase(SECTION, 
+	     "o = new String(); o.toString = Number.prototype.toString; o.toString()", 
+	     "error",   
+	     eval("o = new String(); o.toString = Number.prototype.toString; o.toString()") );
+
+test();