小编Unc*_*ity的帖子

精神上似乎发生了一些变化::x3 破坏了我奇特的小 asdl 解析器。当我从 Qi 移植它时（在最初的 x3 错误修复进入 Fedora 后），它工作得很好，但现在失败了：

/usr/include/boost/spirit/home/x3/operator/detail/sequence.hpp:143:9：错误：静态断言失败：属性没有预期的大小。

#include <boost/spirit/home/x3.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

#include "asdl.h"

typedef boost::variant<asdl::ast::Product, asdl::ast::Sum> type_variant;
typedef std::vector<asdl::ast::Field> field_vec;

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Module,
    (std::string, id)
    (std::vector<asdl::ast::Type>, dfns))

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Type,
    (std::string, name)
    (type_variant, value))

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Field,
    (std::string, type)
    (boost::optional<char>, flag)
    (boost::optional<std::string>, name))

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Constructor,
    (std::string, name)
    (boost::optional<field_vec>, fields))

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Sum,
    (std::vector<asdl::ast::Constructor>, types)
    (boost::optional<field_vec>, attributes))

BOOST_FUSION_ADAPT_STRUCT(
    asdl::ast::Product,
    (field_vec, fields))

namespace asdl
{

namespace x3 = boost::spirit::x3;
namespace ascii = boost::spirit::x3::ascii;

x3::rule<class module,      ast::Module     > const module      = "module";
x3::rule<class …