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

> 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 :(

I reduced the example to:

---8<---
#include <iostream>
#include <vector>

#include <string_view>

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

template <typename It>
void move_to(It b, It e, std::string_view& v)
{
     // Note requires storage to be contiguous
     v = std::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::string_view  attribute_type;
#else
typedef std::string                     attribute_type;
#endif

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

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

     std::vector<std::string> const test_cases {
         R"("FooBar")",
         };

     /* expected output:
      * parse '"FooBar"': succeeded: 'FooBar'
      */

     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;

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

         bool r = phrase_parse(iter, end, string_literal, x3::space, attr);

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

     return 0;
}
--->8---

Is it a bug? Something more to specialize as move_to?

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