Language features very rarely get locked down to specific languages. Go doesn&#x27;t own green threads... after all the term &quot;green threads&quot; predates Go. Nor does it own CSP, and it wasn&#x27;t the first implementation. Also witness the number of languages that got hooked up to the various kernel-poll event loops over the past 10 years. Nowadays labeling a language as &quot;supports event-based polling&quot; is right up there with saying it supports closures... of course it does, it&#x27;s the bare minimum of what anybody will look at anymore.<p>The things that distinguish languages are typically in other dimensions.