[IronPython] Error building ASP.NET 3.5 websites

[Fernando Correia]

I'm trying to upgrade from Beta 5 to RC1 and I'm getting, again, errors
trying to build an ASP.NET 3.5 website that uses IronPython.

The errors are similar to what happened with Beta 1:

(0,0): warning CS1685: The predefined type
'System.Runtime.CompilerServices.ExtensionAttribute' is defined in multiple
assemblies in the global alias; using definition from
'c:\WINDOWS\assembly\GAC_MSIL\System.Core\3.5.0.0__b77a5c561934e089\System.Core.dll'

InternalXmlHelper.vb(9,0): error BC30560: 'ExtensionAttribute' is ambiguous
in the namespace 'System.Runtime.CompilerServices'.

I opened issue 19126 with more details.

Regards,

Fernando.
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