I don't think they do, but with Go which is indeed a simple language, the focus is on letting developers build abstractions rather than providing them in the fo

I don't think they do, but with Go which is indeed a simple language, the focus is on letting developers build abstractions rather than providing them in the form of opinionated language features. And that is, in particular with an eye on performance, usually the right call. One of the worst traps in modern programming is rather than people building specific abstractions tailored to their own needs organically, starting out with them and trying to impose language features on a problem.