In Rust, C, and C++, people have come up with their own solutions to it, which are incompatible with one another, hard to debug, and have caused ecosystem fragmentation. The reality is that evented IO is a system feature that needs to be supported in the standard library first and foremost, if not in the compiler, to avoid competing “async std” implementations, and then a blessed API should be provided to support it so that the ecosystem doesn’t diverge. Go knocked it out of the park on this.