Comment by crabbone

It has none. When code isn't executed concurrently, that's not concurrency. There's idiotic fashion to call unrelated things "concurrency", but it's the same as calling various soy drinks "milk". It just adds confusion for no reason. This language has zero concurrency. It has some mechanism to randomly / unpredictably execute bits of different functions in succession: this is worthless, but has nothing to do with concurrency.