Method system_error

uspace/lib/cpp/src/system_error.cpp:265–267

    }

    system_error::system_error(error_code ec, const string& what_arg)
        : runtime_error{what_arg.c_str()}, code_{ec}
    { /* DUMMY BODY */ }

    system_error::system_error(error_code ec, const char* what_arg)
        : runtime_error{what_arg}, code_{ec}