tests/mozilla/js1_5/Regress/regress-103602.js

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  14 * The Original Code is JavaScript Engine testing utilities.
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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 //-----------------------------------------------------------------------------
  52 var UBound = 0;
  53 var bug = 103602;
  54 var summary = 'Reassignment to a const is NOT an error per ECMA';
  55 var status = '';
  56 var statusitems = [];
  57 var actual = '';
  58 var actualvalues = [];
  59 var expect= '';
  60 var expectedvalues = [];
  61 var cnFAIL_1 = 'Redeclaration of a const FAILED to cause an error';
  62 var cnFAIL_2 = 'Reassigning to a const caused an ERROR! It should not!!!';
  63 var 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  */
  70 try
  71 {
  72   sEval = 'const one = 1';
  73   eval(sEval);
  74 }
  75 catch(e)
  76 {
  77   quit(); // if const is not supported, this testcase is over -
  78 }
  79
  80
  81 status = inSection(1);
  82 try
  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 }
  95 catch(e)
  96 {
  97   // good - we should be here.
  98   actual = expect;
  99   addThis();
 100 }
 101
 102
 103 status = inSection(2);
 104 try
 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
 126 catch(e)
 127 {
 128   // BAD - we shouldn't be here
 129   expect = '';
 130   actual = cnFAIL_2;
 131   addThis();
 132 }
 133
 134
 135
 136 //-----------------------------------------------------------------------------
 137 test();
 138 //-----------------------------------------------------------------------------
 139
 140
 141 function addThis()
 142 {
 143   statusitems[UBound] = status;
 144   actualvalues[UBound] = actual;
 145   expectedvalues[UBound] = expect;
 146   UBound++;
 147 }
 148
 149
 150 function 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 }