Comment by anonymoushn

This, and your replies below, read like trolling written by someone who hasn't used the features he is claiming are unnecessary. They repeatedly fail to address the point: you actually can't begin in Scala with no notion of lightweight threads, coroutines, or continuations, and simply make a library that does one of those things.

  "The style one can program in and the style it is implemented isn't connected the way you think it is."

The above might be alluding to techniques for pretending to have these language features when one does not. You can write CPS manually, and you might even be able to make a machine apply the CPS transformation automatically to your procedural code. Neither of these things sound particularly fun, compared to the alternative of writing procedural code and then debugging the code that you've actually written. It's little help that you have to return every once in a while to avoid a StackOverflow due to the language's embarrassing lack of TCO.

Edit: Apparently if you use Squawk you can have green threads. Can you have OS threads as well?