313033 - E4X: XML objects can't access methods on XML.prototype, and overriding existing methods on XML.prototype causes problems

Status: RESOLVED DUPLICATE of bug 312196

(Core :: JavaScript Engine, defect)

Description

[Yuh-Ruey Chen]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b5) Gecko/20051018
Firefox/1.4.1 ID:2005101805

I try defining a method on XML.prototype and XMLList.prototype as such:
XML.prototype.function::foo = XMLList.prototype.function::foo = function() {};

Attempting to invoke this method on an XML or XMLList object throws a "not
found" error:
var a = <root><section><subsection/></section></root>;
a.foo() // throws error
a.function::foo // returns undefined

When overriding an built-in method such as children() on XML/XMLList.prototype,
attempting to invoke this new method also throws an error (resulting in
accessing neither the new method nor the built-in method). For example:

XML.prototype.function::children = XMLList.prototype.function::children =
function() {};
a.children() // throws error
a.function::function // returns undefined

Comment 1

[Yuh-Ruey Chen]

Attachment: testcase

Forgot to mention that I'm not that familiar with E4X, and I'm not sure if this
bug is valid.

Comment 2

[Brendan Eich [:brendan]]

This is how E4X works, broken-as-designed.  In SpiderMonkey, you can use the
function:: namespace qualifier to get and set methods.

I believe this bug is a dup.

/be

Comment 3

[Yuh-Ruey Chen]

I AM using the function:: namespace.

Comment 4

[Brendan Eich [:brendan]]

Sorry!  This is a dup, still.  Followup fix patch still pending review in bug
312196, but the first patch already went into the trunk, and it fixes your testcase.

/be

*** This bug has been marked as a duplicate of 312196 ***