Boost spirit skipper issues

I have trouble with boost spirit skippers.

I need to parse a file like that :

ROW int
int [int, int]
int [int, int]
...

I am able to parse it without problem (thanks to stackoverflow ;) only if I add an '_' after the first int.

In fact, I think the skipper eat the end of line after the first int, so the first and second (on second line) look as only one int. I don't understand how to keep eol but eat spaces. I've found examples to use a custom parser like here and here.

I tried qi::blank, custom parser with one single rule lit(' ') No matter what skipper I use, space and eol are always eat.

My grammar is :

a line :

struct rowType
{
    unsigned int number;
    std::list<unsigned int> list;
};

the full problem stored in a structure :

struct problemType
{
    unsigned int ROW;
    std::vector<rowType> rows;
};

the row parser :

template<typename Iterator>
struct row_parser : qi::grammar<Iterator, rowType(), qi::space_type>
{
    row_parser() : row_parser::base_type(start)
    {

        list  = '[' >> -(qi::int_ % ',') >> ']';
        start = qi::int_ >> list;
    }

    qi::rule<Iterator, rowType(), qi::space_type> start;
    qi::rule<Iterator, std::list<unsigned int>(), qi::space_type> list;
};

and the problem parser :

template<typename Iterator>
struct problem_parser : qi::grammar<Iterator,problemType(),qi::space_type>
{

    problem_parser() : problem_parser::base_type(start)
    {
        using boost::phoenix::bind;
        using qi::lit;

        start = qi::int_ >> lit('_') >>