string_view and c.insert(c.end(), std::move(val)) compile error

Hello,

for my x3 parser I replaced string with string_view, but failed in this 
concrete case. For some reasons it want to insert into a container which 
must fail in this case. I separated the raw rule, but no luck. Setting 
x3::raw outside works, but the double quotes are embedded which isn't 
intended. What do I overlook here? '"' is handled as literal, isn't it? 
Explicit use of x3::lit('"') doesn't change it. How to fix the rule? 
Note, I'm using an older compiler not fully C++17 aware :(


Thanks,

Olaf

---8<---

#include <iostream>
#include <vector>


#include <experimental/string_view>

namespace boost { namespace spirit { namespace x3 { namespace traits {

template <typename It>
void move_to(It b, It e, std::experimental::string_view& v)
{
     // Note storage is contiguous, requires a concept check for input 
range, how to?
     v = std::experimental::string_view(&*b, e - b);
}

} } } }


//#define BOOST_SPIRIT_X3_DEBUG
#include <boost/spirit/home/x3.hpp>

#if 1
// XXX basic_string_view<char>« has no member named »insert« XXX
typedef std::experimental::string_view  attribute_type;
#else
typedef std::string                     attribute_type;
#endif

namespace parser {

     namespace x3 = boost::spirit::x3;
     namespace iso8859_1 = boost::spirit::x3::iso8859_1;

     using iso8859_1::char_;

     auto const string_literal_atom = x3::rule<struct _, attribute_type> 
{ "string_literal" } =
         x3::raw[ x3::lexeme [
             *(  (char_ - '"')
              | "\"\""
              )
         ]]
         ;

     auto const string_literal = x3::rule<struct _, attribute_type> { 
"string_literal" } =
         x3::no_skip[
            '"'
         >> string_literal_atom
         >> '"'
         ]
         ;
}


int main()
{
     namespace x3 = boost::spirit::x3;

     std::vector<std::string> const test_cases {
         R"("FooBar")",
         R"("FooBar"  )",
         R"(    "FooBar"  )",
         R"(" "" FooBarBaz "" ")"       // with ""inner escaped"" quotes
         };

     typedef std::string::const_iterator iterator_type;

     for(auto str: test_cases) {
         iterator_type iter = str.begin();
         iterator_type const end = str.end();

         attribute_type attr;

         auto& rule = parser::string_literal;

         std::cout << "parse '" << str << "': ";

         bool r = phrase_parse(iter, end, *x3::space >> rule, x3::space, 
attr);

         if (r && iter == end) {
             std::cout << "succeeded: '" << attr << "'\n";
         } else {
             std::cout << "*** failed ***\n";
         }
     }

     return 0;
}

--->8---


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