[Webkit-unassigned] [Bug 6639] New: for...in returns duplicate keys when used with prototype inheritance

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=6639

           Summary: for...in returns duplicate keys when used with prototype
                    inheritance
           Product: WebKit
           Version: 412+
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: JavaScript
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: jesse at cozgood.com


The following code evaluates to "toString toString", however, for...in should never return duplicate keys.

var A = function() {};
A.prototype.toString = function() { "A" };

var B = function() {};
B.prototype = new A();
B.prototype.toString = function() { "B" };

var s = "";
for (var f in B.prototype) s += f + " ";
s

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