[Webkit-unassigned] [Bug 21959] New: modifications to arguments object not respected by Function.prototype.apply

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=21959

           Summary: modifications to arguments object not respected by
                    Function.prototype.apply
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://pastebin.mozilla.org/564192
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bn at cs.stanford.edu


Modifying |arguments| with [].splice is broken:

function argc() { return arguments.length }

function test() {
    [].splice.call(arguments, 0, 0, 1);
    return [
        arguments.length,
        argc.apply(null, arguments)
    ];
}

test() // [1, 0]
test(1) // [2, 1]
test(1,2) // [3, 2]
test(1,2,3) // [4, 3]


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