1.35.0 - MSC8/9 error C2059: syntax error : '__is_abstract'

Hi
I have problemes with the serialization since I updated to boost 1.35.0

Error:
intrinsics.hpp

#   define BOOST_IS_ABSTRACT(T) __is_abstract(T) //<-error C2059: syntax
error : '__is_abstract'
#   define BOOST_IS_CLASS(T) __is_class(T)       //this one isn't syntax
higloghted, maybe not defined, too.

Any idea what's the matter?

I checked out the head revision and it doesn't work two.

Best,
SirAnn

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