X3 problem

Hi!

I really can't figure out what's wrong with this... Can anyone figure out what's wrong? Using boost 1.60.

It seem to be exactly as prescribed, and the error messages that X3 produce are less then helpful:

http://coliru.stacked-crooked.com/a/5c128d4f02379eb8

#include <iostream>
#include <string>
#include <vector>
#include <boost/spirit/home/x3.hpp>
#include <boost/optional.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

using std::string;
using std::vector;
using std::pair;

namespace x3 = boost::spirit::x3;

int parse_input(vector<string> v);

int main(int argc, const char* argv[]) {
    if (argc > 1) {
      return parse_input(vector<string>(&argv[1], &argv[argc + !argc]));
    }
    return 1;
}

struct XXX {
  int a;
  boost::optional<pair<int, int>> b;
};

BOOST_FUSION_ADAPT_STRUCT(XXX, a, b)

int parse_input(vector<string> v) {
  std::stringstream ss;
  std::copy(v.begin(), v.end(), std::ostream_iterator<string>(ss, " "));
  string s = ss.str();
  auto iter = s.begin();
  auto end = s.end();
  XXX x;
  bool success = x3::phrase_parse(iter, end, x3::int_ >> -(x3::int_ >> x3::int_), x3::space, x);
  return !success;
}

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