Parser Spirit trivial grammar segmentation error

I ran into frequent segfaults with my Spirit Qi parser.

After spending a few days to debug the problem (I found that stop tracks are not possible), I decided to trim it to a minimal example. Can anyone say what I'm doing wrong if anything?

Save the code as bug.cpp, compile with g++ -Wall -o bug bug.cpp, and you should be good to go.

//#define BOOST_SPIRIT_DEBUG_PRINT_SOME 80
//#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/version.hpp>
#include <boost/spirit/include/qi.hpp>
#include <iostream>
#include <fstream>
#include <iterator>
#include <string>

namespace /*anon*/
{
    using namespace boost::spirit::qi;

    template <typename Iterator, typename
        Skipper> struct bug_demo : 
            public grammar<Iterator, Skipper>
    {
        bug_demo() : 
            grammar<Iterator, Skipper>(story, "bug"),
            story(the),
            the("the")
        {
//          BOOST_SPIRIT_DEBUG_NODE(story);
//          BOOST_SPIRIT_DEBUG_NODE(the);
        }

        rule<Iterator, Skipper> story, the;
    };

    template <typename It>
        bool do_parse(It begin, It end)
    {
        bug_demo<It, space_type> grammar;
        return phrase_parse(begin, end, grammar, space);
    }
}

int main()
{
    std::cout << "Spirit version: " << std::hex << SPIRIT_VERSION << std::endl;

    try
    {
        std::string contents = "the lazy cow";
        if (do_parse(contents.begin(), contents.end()))
            return 0;
    } catch (std::exception e)
    {
        std::cerr << "exception: " << e.what() << std::endl;
    }
    return 255;
}

I tested this with

• g ++ 4.4, 4.5, 4.6 and
• boost versions 1.42 (ubuntu meerkat) and 1.46.1.1 (natty)

Output signal

sehe@meerkat:/tmp$ ./bug 
Spirit version: 2020
Segmentation fault

Or, with an increase of 1.46.1, he will report Spirit version: 2042