lamda

// Can lamda's be attached to grammar rules? E.g.,

    x3::rule<class _desc> const _desc = "_desc";
    auto const _desc_def = *(char_ - eol);
    BOOST_SPIRIT_DEFINE(_desc);

    auto description = skip(blank) [
        *(_desc >> eol)
    ];

    auto process_desc = [&] (auto& ctx) {
        std::cout << _attr(ctx) << std::endl;
    };

    auto const input = description[process_desc];

/*
By doing this, I get this error ...

test.cpp:48:42:   required from here
/usr/include/boost/spirit/home/x3/core/call.hpp:72:28: error: use of ‘auto boost::spirit::x3::detail::call(F, const Context&, mpl_::true_) [with F = parser::smf::<lambda(auto:1&)>; Context = boost::spirit::x3::context<boost::spirit::x3::attr_context_tag, boost::spirit::x3::unused_type, boost::spirit::x3::context<boost::spirit::x3::where_context_tag, boost::iterator_range<boost::spirit::basic_istream_iterator<char> >, boost::spirit::x3::context<boost::spirit::x3::rule_val_context_tag, const boost::spirit::x3::unused_type, boost::spirit::x3::context<boost::spirit::x3::parse_pass_context_tag, bool, boost::spirit::x3::unused_type> > > >; mpl_::true_ = mpl_::bool_<true>]’ before deduction of ‘auto’
         return detail::call(f, attr_context, is_callable<F(decltype(attr_contex
                            ^
*/