[Webkit-unassigned] [Bug 48632] New: ES5 Strict mode: Assignment to property with [[Writable]] false must produce a TypeError

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=48632

           Summary: ES5 Strict mode: Assignment to property with
                    [[Writable]] false must produce a TypeError
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: asen.bozhilov at gmail.com


The follow test case has been used: 

/**
 * Assignment to an undeclared identifier or otherwise unresolvable reference does not create a
 * property in the global object. When a simple assignment occurs within strict mode code, its
 * LeftHandSide must not evaluate to an unresolvable Reference. If it does a ReferenceError  
 * exception is thrown (8.7.2). The LeftHandSide also may not be a reference to a data property
 * with the attribute value {[[Writable]]:false}, to an accessor property with the attribute value
 * {[[Set]]:undefined}, nor to a non-existent property of an object whose [[Extensible]] internal
 * property has the value false. In these cases a TypeError exception is thrown (11.13.1).
 */

var testDesc = 'Assignment to property with [[Writable]] false must produce a TypeError: ';
try {
    eval('"use strict"; (function(){}).length = 20;');
    util.printLine(testDesc + 'FALSE'); 
} catch (e) {
    if (e instanceof TypeError) {
        util.printLine(testDesc + 'TRUE'); 
    }
    else {
        util.printLine(testDesc + 'UNDEFINED BEHAVIOR');
    }
}

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