While people can argue swift could be Golang, it's built with focus on iOS ecosystem. You have to manually handle reference cycles. The language is quite comple

While people can argue swift could be Golang, it's built with focus on iOS ecosystem. You have to manually handle reference cycles. The language is quite complex as well, and compiler is among the slow ones. Copy-on-write is generally despised these days even in C++. Just to keep in mind that this may give space for a next expressive general purpose language that improves in these aspects, we can be optimistic.