fusion pair issue?

Given the trivial working attached code, I do the following:

--- works.cpp	2017-03-27 17:25:13.008492450 +0200
+++ fails.cpp	2016-06-14 13:17:12.683679158 +0200
@@ -2,16 +2,17 @@
 
 #include <boost/spirit/home/x3.hpp>
 #include <boost/fusion/include/adapt_struct.hpp>
+#include <boost/fusion/include/std_pair.hpp>
 
 namespace x3 = boost::spirit::x3;
 
 struct result
 {
-	std::string first, second;
+	std::pair<std::string, std::string> both;
 };
 
 BOOST_FUSION_ADAPT_STRUCT(result,
-	first, second
+	both
 )
 
 int main()
@@ -27,8 +28,8 @@
 		std::cout << "Bit left over at the end: "
 		          << std::string(iter, end) << std::endl;
 	else
-		std::cout << "found: " << res.first << ' '
-		                       << res.second << std::endl;
+		std::cout << "found: " << res.both.first << ' '
+		                       << res.both.second << std::endl;
 
 	return 0;
 }


and get a compiler error. What have I forgotten to change?

(Hoping to use the automatic semantic action feature of x3. I'm sure I
could write a lot more code and have it work, but I don't see why a priori
the above isn't sufficient...)

Cheers,

Patrick

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#define BOOST_SPIRIT_X3_DEBUG

#include <boost/spirit/home/x3.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

namespace x3 = boost::spirit::x3;

struct result
{
	std::string first, second;
};

BOOST_FUSION_ADAPT_STRUCT(result,
	first, second
)

int main()
{
	std::string buf("one two");
	std::string::const_iterator iter = buf.begin();
	std::string::const_iterator end = buf.end();
	result res;
	bool ok = x3::parse(iter, end, +x3::alnum >> ' ' >> +x3::alnum, res);
	if (!ok)
		std::cout << "Parsing failed\n";
	else if (iter != end)
		std::cout << "Bit left over at the end: "
		          << std::string(iter, end) << std::endl;
	else
		std::cout << "found: " << res.first << ' '
		                       << res.second << std::endl;

	return 0;
}