Method message

include/boost/leaf/error.hpp:628–628

        bool equivalent( std::error_code const &, int ) const noexcept override { return false; }
        char const * name() const noexcept override { return "LEAF error"; }
        std::string message( int ) const override { return name(); }
    public:
        ~leaf_error_category() noexcept override { }
    };