[Spirit Development][Phoenix]Assignment of fusion tuples fails in semantic actions.

I am trying to assign a fusion tuple to a fusion adapted struct in a
semantic action, but it fails to compile.  It says that there is no
equals operator defined.  I did include the phoenix_operator header
this time ;)
I could of course write the = operator in the struct, but wouldn't
that kind of defeat the purpose of adapting it as a fusion sequence in
the first place?  They are both proper fusion sequences; I really
think that assignment should be taken care of automatically.

This rule looks like it should work out of the box, but it doesn't.
rule<std::string::iterator,point()> value_rule = (int_ >> int_)[_val = _0];

Is this a bug, or do I need to write a custom = operator that takes a
fusion struct as a parameter?

Here is the full program.


#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted/struct/adapt_struct.hpp>
#include <boost/spirit/include/phoenix_fusion.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <string>

struct point
{
 int x;
 int y;
 //point(const boost::fusion::vector2<int, int>& right); //why would I
need to manually write this?
};

BOOST_FUSION_ADAPT_STRUCT(point,(int, x) (int, y))

int main()
{
  using namespace boost::spirit::qi;
  rule<std::string::iterator,point()> value_rule = (int_ >> int_)[_val = _0];
}

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#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted/struct/adapt_struct.hpp>
#include <boost/spirit/include/phoenix_fusion.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <string>

struct point
{
 int x;
 int y;
 //point(const boost::fusion::vector2<int, int>& right); //why do I need to manually write this?
};

BOOST_FUSION_ADAPT_STRUCT(point,(int, x) (int, y))

int main()
{
  using namespace boost::spirit::qi;
  rule<std::string::iterator,point()> value_rule = (int_ >> int_)[_val = _0];
}