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#include<iostream>
#include<fstream>
 
#include<boost/archive/xml_oarchive.hpp>
#include<boost/archive/xml_iarchive.hpp>
#include<boost/serialization/nvp.hpp>
 
typedef union{
	struct { long x, y; };
} long2;
 
namespace boost{ namespace serialization {
	template<class Archive> void serialize(Archive &ar, long2 &i, const unsigned version){
	   ar & make_nvp("x",i.x);
	   ar & make_nvp("y",i.y);
	}
}};
 
int main(void){
	// output, works fine
	long2 a; a.x=1;// a.y=2;
	std::ofstream out("/tmp/a.xml");
	boost::archive::xml_oarchive outA(out);
	outA<<boost::serialization::make_nvp("foo",a);
	out.close();
 
	// input, compile-time error
	long2 b;
	std::ifstream in("/tmp/a.xml");
	boost::archive::xml_iarchive inA(in);
	inA>>boost::serialization::make_nvp("foo",b);
	in.close();
 
	// should write 1,2
	std::cerr<<b.x<<","<<b.y<<std::endl;
};

/usr/include/boost/archive/detail/oserializer.hpp: In static member function ‘static void boost::archive::detail::save_non_pointer_type<Archive, T>::invoke(Archive&, const T&) [with Archive = boost::archive::xml_oarchive, T = long2]’:
/usr/include/boost/archive/detail/oserializer.hpp:506:   instantiated from ‘void boost::archive::save(Archive&, const T&) [with Archive = boost::archive::xml_oarchive, T = long2]’
/usr/include/boost/archive/detail/common_oarchive.hpp:64:   instantiated from ‘void boost::archive::detail::common_oarchive<Archive>::save_override(T&, int) [with T = const long2, Archive = boost::archive::xml_oarchive]’
/usr/include/boost/archive/basic_xml_oarchive.hpp:102:   instantiated from ‘void boost::archive::basic_xml_oarchive<Archive>::save_override(const boost::serialization::nvp<T>&, int) [with T = long2, Archive = boost::archive::xml_oarchive]’
/usr/include/boost/archive/detail/interface_oarchive.hpp:64:   instantiated from ‘Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const boost::serialization::nvp<long2>, Archive = boost::archive::xml_oarchive]’
prog.cpp:24:   instantiated from here
/usr/include/boost/archive/detail/oserializer.hpp:293: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 
/usr/include/boost/archive/detail/oserializer.hpp:293: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 
/usr/include/boost/archive/detail/iserializer.hpp: In static member function ‘static void boost::archive::detail::load_non_pointer_type<Archive, T>::invoke(Archive&, T&) [with Archive = boost::archive::xml_iarchive, T = long2]’:
/usr/include/boost/archive/detail/iserializer.hpp:532:   instantiated from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::xml_iarchive, T = long2]’
/usr/include/boost/archive/detail/common_iarchive.hpp:59:   instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = long2, Archive = boost::archive::xml_iarchive]’
/usr/include/boost/archive/basic_xml_iarchive.hpp:81:   instantiated from ‘void boost::archive::basic_xml_iarchive<Archive>::load_override(const boost::serialization::nvp<T>&, int) [with T = long2, Archive = boost::archive::xml_iarchive]’
/usr/include/boost/archive/xml_iarchive.hpp:74:   instantiated from ‘void boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T = const boost::serialization::nvp<long2>, Archive = boost::archive::xml_iarchive]’
/usr/include/boost/archive/detail/interface_iarchive.hpp:61:   instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const boost::serialization::nvp<long2>, Archive = boost::archive::xml_iarchive]’
prog.cpp:31:   instantiated from here
/usr/include/boost/archive/detail/iserializer.hpp:405: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 
/usr/include/boost/archive/detail/iserializer.hpp:405: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ 

Standard output is empty