In response to Circle's tweets

[Remi123]

From time to time the author of Circle-Lang tweets about meta-programming and he wrote some meta-function using his tool.
https://twitter.com/seanbax/status/1412233048402374661/photo/1

From time to time, I just like to reproduce it using my library, but in C++11.
https://godbolt.org/z/6r84854vM

There is limit to what I can reproduce, like it's template auto