x3 cannot synthesize attribute of type boost::iterator_range in a sequence parser

[wanghan02@…]

In a simple parser test ​http://coliru.stacked-crooked.com/a/5b3bde9736c9fc43

    std::string str("x123x"); 
    boost::iterator_range<boost::range_iterator<decltype(str)>::type> attr; 
    if( x3::parse( boost::begin(str), boost::end(str), x3::lit('x') >> x3::raw[+x3::digit] >> x3::lit('x'), attr ) ) { 
        std::cout<<"Match! attr = "<<attr<<std::endl; 
    } else { 
        std::cout<<"Not match!"<<std::endl; 
    }

x3::lit('x') >> x3::raw[+x3::digit] >> x3::lit('x') is supposed to synthesize an attribute of type boost::iterator_range<Iterator>. But it cannot compile. If we remove either of the two x3::lit('x'), it compiles.

[mike.gresens@…]

Should be fixed in ​https://github.com/boostorg/spirit/pull/316