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`hackcasual` was saying that certain language features can be added as a library rather than needing to be integrated into the core language

> "fundamentally it's functionality other languages can provide via library support"

You were saying that CSP can be added as a library, citing Clojure's core.async.

All I was saying was that the way in which core.async was implemented doesn't feel like a great example of a 'library' in the sense that most people would understand in the context of a discussion about Golang.

Golang is a static, compiled-to-machine-code language without macros (in the LISP or C sense) or homoiconicity. The reason core.async can be implemented as a library in Clojure is that it has these things.

If you're talking about adding CSP to a language just by adding a library and without having to get into the internals of the language, core.async isn't a good example.

Again, happy to be corrected.

Well core.async is a Clojure library so it uses features available in Clojure. I don't see how it would affect the fact that it is a library.

I've also linked to js-csp, a JS library obviously not implemented using macros.

I can also find other examples of implementation as libraries, but I have no experience with them:

- Scala: https://github.com/rssh/scala-gopher

- F#: https://github.com/Hopac/Hopac

- C++: http://www.cs.kent.ac.uk/projects/ofa/c++csp/

Wasn't saying it can't be done! Just nit-picking at the particular example wrt to golang.
Ok, I've got it now :)