Rust Keyword Generics Progress Report: February 2023

I have not used it but understand there are some attempts underway to introduce a coroutine-based concurrency implementation to Rust, e.g., May -- https://github.com/Xudong-Huang/may -- similar to "goroutines" in Go and (I presume) the implementation in Ruby you describe.

I enjoyed using Go for the reasons you describe: Generally, any code from any lib can generally be put into a goroutine and interacted with via channels. It does force you to structure your code very differently than async/await syntax does, however. From what I understand, Kotlin also has a pretty mature coroutine implementation at this point, though it also requires a certain amount of "coloring" functions as well.

I'm not sure how this will ultimately play out in Rust, but it will be interesting if we ultimately have multiple options for approaching concurrency.