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14* The Original Code is JavaScript Engine testing utilities.
15*
16* The Initial Developer of the Original Code is Netscape Communications Corp.
17* Portions created by the Initial Developer are Copyright (C) 2001
18* the Initial Developer. All Rights Reserved.
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20* Contributor(s): pschwartau@netscape.com
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35*
36*
37* Date:    10 Jan 2002
38* SUMMARY: Reassignment to a const is NOT an error per ECMA
39* See http://bugzilla.mozilla.org/show_bug.cgi?id=103602
40*
41* ------- Additional Comment #4 From Brendan Eich 2002-01-10 15:30 -------
42*
43* That's per ECMA (don't blame me, I fought for what Netscape always did:
44* throw an error [could be a catchable exception since 1.3]).
45* Readonly properties, when set by assignment, are not changed, but no error
46* or exception is thrown. The value of the assignment expression is the value
47* of the r.h.s.
48*
49* If you want a *strict* warning, pls change the summary of this bug to say so.
50*/
51//-----------------------------------------------------------------------------
52var UBound = 0;
53var bug = 103602;
54var summary = 'Reassignment to a const is NOT an error per ECMA';
55var status = '';
56var statusitems = [];
57var actual = '';
58var actualvalues = [];
59var expect= '';
60var expectedvalues = [];
61var cnFAIL_1 = 'Redeclaration of a const FAILED to cause an error';
62var cnFAIL_2 = 'Reassigning to a const caused an ERROR! It should not!!!';
63var sEval = '';
64
65/*
66 * Not every implementation supports const (a non-ECMA extension)
67 * For example, Rhino does not; it would generate a complile-time error.
68 * So we have to hide this so it will be detected at run-time instead.
69 */
70try
71{
72  sEval = 'const one = 1';
73  eval(sEval);
74}
75catch(e)
76{
77  quit(); // if const is not supported, this testcase is over -
78}
79
80
81status = inSection(1);
82try
83{
84  /*
85   * Redeclaration of const should be a compile-time error.
86   * Hide so it will be detected at run-time.
87   */
88  sEval = 'const one = 2;';
89  eval(sEval);
90
91  expect = ''; // we shouldn't reach this line
92  actual = cnFAIL_1;
93  addThis();
94}
95catch(e)
96{
97  // good - we should be here.
98  actual = expect;
99  addThis();
100}
101
102
103status = inSection(2);
104try
105{
106  /*
107   * Reassignment to a const should be NOT be an error, per ECMA.
108   */
109  one = 2;
110  actual = expect; // good: no error was generated
111  addThis();
112
113  // although no error, the assignment should have been ignored -
114  status = inSection(3);
115  actual = one;
116  expect = 1;
117  addThis();
118
119  // the value of the EXPRESSION, however, is the value of the r.h.s. -
120  status = inSection(4);
121  actual = (one = 2);
122  expect = 2;
123  addThis();
124}
125
126catch(e)
127{
128  // BAD - we shouldn't be here
129  expect = '';
130  actual = cnFAIL_2;
131  addThis();
132}
133
134
135
136//-----------------------------------------------------------------------------
137test();
138//-----------------------------------------------------------------------------
139
140
141function addThis()
142{
143  statusitems[UBound] = status;
144  actualvalues[UBound] = actual;
145  expectedvalues[UBound] = expect;
146  UBound++;
147}
148
149
150function test()
151{
152  enterFunc ('test');
153  printBugNumber (bug);
154  printStatus (summary);
155
156  for (var i = 0; i < UBound; i++)
157  {
158    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
159  }
160
161  exitFunc ('test');
162}
163