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42 * SUMMARY: Testing the arguments object
44 * See http://bugzilla.mozilla.org/show_bug.cgi?id=72884
46 //-----------------------------------------------------------------------------
48 var BUGNUMBER = 72884;
49 var summary = 'Testing the arguments object';
51 var statusitems = [ ];
53 var actualvalues = [ ];
55 var expectedvalues = [ ];
59 status = inSection(1);
62 delete arguments.length;
67 actual = a instanceof Object;
71 actual = a instanceof Array;
81 status = inSection(2);
83 actual = a instanceof Object;
87 actual = a instanceof Array;
109 status = inSection(3);
113 * Note that only callee and length can be overridden, so deleting an indexed
114 * property and asking for it again causes it to be recreated by args_resolve:
116 * function g(){delete arguments[0]; return arguments[0]}
117 * g(42) // should this print 42?
119 * I'm not positive this violates ECMA, which allows in chapter 16 for extensions
120 * including properties (does it allow for magically reappearing properties?). The
121 * delete operator successfully deletes arguments[0] and results in true, but that
122 * is not distinguishable from the case where arguments[0] was delegated to
123 * Arguments.prototype[0], which was how the bad old code worked.
125 * I'll ponder this last detail...
127 * UPDATE: Per ECMA-262, delete on an arguments[i] should succeed
128 * and remove that property from the arguments object, leaving any get
129 * of it after the delete to evaluate to undefined.
137 expect = undefined; // not 42...
142 //-------------------------------------------------------------------------------------------------
144 //-------------------------------------------------------------------------------------------------
149 statusitems[UBound] = status;
150 actualvalues[UBound] = actual;
151 expectedvalues[UBound] = expect;
159 printBugNumber(BUGNUMBER);
160 printStatus (summary);
162 for (var i = 0; i < UBound; i++)
164 reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);