Respeced Mr.Emil,

Thank you for your kindly reply.

>I can't reproduce this with msvc versions available on godbolt:
 Exactly on godbolt,the compilers work well. I test this by myself.
Once again, I change to the Microsoft Visual Studio Community 2019
ver. 16.11.18. And compile the program ,the error still exist.

>Can you provide a complete error log, including source file and line of the


soruce file:info.hpp
source code line no:145
soruce code:error_info_container_impl * c=new error_info_container_impl;
error log:
C2259    “boost::exception_detail::error_info_container_impl”: cannot instantiate abstract class, test_boost    D:\boost_1_79_0\boost\exception\info.hpp    145   

Best regards,