Someone wrote pattern matching as a macro - nim is pretty powerful.

What algebraic datatypes is Nim missing?

It has generics, tuples, tagged and untagged unions, it even has C++20 concepts.

This is enough to make me keep using C++ for the use cases where Nim is meant to shine, or choose Rust instead. If I'm to learn a modern language, I really expect it to support modern paradigms.

I can see why it'd be interesting to someone with no C/C++ knowledge to get into systems programming though.