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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+gTestfile = '11.6.2-1.js';
+
+/**
+   File Name:          11.6.2-1.js
+   ECMA Section:       11.6.2 The Subtraction operator ( - )
+   Description:
+
+   The production AdditiveExpression : AdditiveExpression -
+   MultiplicativeExpression is evaluated as follows:
+
+   1.  Evaluate AdditiveExpression.
+   2.  Call GetValue(Result(1)).
+   3.  Evaluate MultiplicativeExpression.
+   4.  Call GetValue(Result(3)).
+   5.  Call ToNumber(Result(2)).
+   6.  Call ToNumber(Result(4)).
+   7.  Apply the subtraction operation to Result(5) and Result(6). See the
+   discussion below (11.6.3).
+   8.  Return Result(7).
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+var SECTION = "11.6.2-1";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " The subtraction operator ( - )");
+
+// tests "MyValuelessObject", where the value is
+// set in the object's prototype, not the object itself.
+
+
+new TestCase(   SECTION,
+                "var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 - EXP_2",
+                1,
+                eval("var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 - EXP_2") );
+
+new TestCase(   SECTION,
+                "var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 - EXP_2",
+                Number.NaN,
+                eval("var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 - EXP_2") );
+
+// tests "MyValuelessObject", where the value is
+// set in the object's prototype, not the object itself.
+
+new TestCase(   SECTION,
+                "var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(1); EXP_1 - EXP_2",
+                99,
+                eval("var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(1); EXP_1 - EXP_2") );
+/*
+  new TestCase(   SECTION,
+  "var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(1)); EXP_1 - EXP_2",
+  Number.NaN,
+  eval("var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(1)); EXP_1 - EXP_2") );
+*/
+// same thing with string!
+
+test();
+
+function MyProtoValuelessObject() {
+  this.valueOf = new Function ( "" );
+  this.__proto__ = null;
+}
+function MyProtolessObject( value ) {
+  this.valueOf = new Function( "return this.value" );
+  this.__proto__ = null;
+  this.value = value;
+}
+function MyValuelessObject(value) {
+  this.__proto__ = new MyPrototypeObject(value);
+}
+function MyPrototypeObject(value) {
+  this.valueOf = new Function( "return this.value;" );
+  this.toString = new Function( "return (this.value + '');" );
+  this.value = value;
+}
+function MyObject( value ) {
+  this.valueOf = new Function( "return this.value" );
+  this.value = value;
+}
+function MyOtherObject( value ) {
+  this.valueOf = new Function( "return this.value" );
+  this.toString = new Function ( "return this.value + ''" );
+  this.value = value;
+}