> compiles to stable and mature Go and can use every existing Go library
Go+[1](goplus), around since 2020, is already an "extra features" version of Go, that compiles into Go
> It has immutability. It has advanced enums. It has algebraic types.
> It literally addresses every major complaint people have with Go
V[2](vlang) is a Go alternative language that has such features. It was originally given the title of child of Rust and Go[3]. On top of that, even has a Go2V transpiler available.
Speaking of Go alternatives, Odin[4] is not too far away as well, and has recently taken the position of labeling itself as an alternative to Go.
> if only it had this X advanced feature, it would be totally great
Not only are these languages labeled as Go alternatives (Go+, Vlang, and Odin), but they have a significant number of fans, more GitHub stars, and/or a large numbers of contributors.
It could be argued that the field is already kind of crowded. If we squint a little, several other languages could have been added to the list (like C3 and Jai), as alternatives.
[1]: https://goplus.org/
[2]: https://vlang.io
[3]: https://www.youtube.com/watch?v=puy77WfM1Tg (Is VLang Better Than Go And Rust? --Anthony GG)
[4]: https://odin-lang.org/