2019
https://www.infoq.com/news/2019/06/CSharp-8-Pattern-Matching/
https://devblogs.microsoft.com/dotnet/do-more-with-patterns-in-c-8-0/
2017
https://blogs.msdn.microsoft.com/seteplia/2017/10/16/dissecting-the-pattern-matching-in-c-7/
    https://habr.com/company/microsoft/blog/423229/
    https://habr.com/post/347916/