Hi jsprogrammer. You read my comment way too literally. I did not mean that a new language should have a feature that can literally not be done anywhere else.

Hi jsprogrammer. You read my comment way too literally. I did not mean that a new language should have a feature that can literally not be done anywhere else. I meant: what are the uncommon features? What sets this language apart from the (dominant) other langs? As someone else pointed out, in golang this would be goroutines or channels or golang's approach to composition vs inheritance. You can certainly implement those in another language, but they're not first-class features in most other langs. Put together, those elements give golang it's characteristic flavor. For this new lang, I'm interested in learning (as early in the docs as possible) what sets it apart from C, C++, golang, python, ruby, JS, haskell, erlang, D, etc. The hello world example teaches the reader something, but it's not the thing a person first landing on that page probably cares about. And going back to my original statement, there's lots of things that are still missing from programming langs and associated ecosystems. Just look at JS, and how even today people are still furiously trying to extend it and work around it just to build simple reactive websites.