#include<boost/spirit/include/karma.hpp>
#include<boost/spirit/include/karma_format_attr.hpp>
#include<list>
#include<iostream>

BOOST_AUTO(par, '{' << -(boost::spirit::karma::int_ % ',') << '}');//Define par here would lead to error!
int main(){
	using namespace std;
	namespace karma = boost::spirit::karma;	
	list<int> l{1, 2, 4};
	//BOOST_AUTO(par, '{' << -(boost::spirit::karma::int_ % ',') << '}');//Whils this would not!
	cout<<karma::format(par, l)<<endl;
	return 0;
}