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The type of system error thrown by the library.
        Defined in header <boost/json/system_error.hpp>
      
using system_error = boost::system::system_error;
This type alias is set depending on how the library is configured:
        If the macro BOOST_JSON_STANDALONE
        is not defined, this type will be an alias for boost::system::system_error.
        Compiling a program using the library will require Boost, and a compiler
        conforming to C++11 or later.
      
        If the macro BOOST_JSON_STANDALONE
        is defined, this type will be an alias for std::system_error.
        Compiling a program using the library will require only a compiler conforming
        to C++17 or later.
      
https://en.cppreference.com/w/cpp/error/system_error
        Convenience header <boost/json.hpp>