GC'd language variant: Go

[jsha]

Thanks for working on this project!

https://rust-lang.github.io/wg-async-foundations/vision/characters/alan.html

I think a "Variant D: Go" would be useful here. Proposed text:

Alan develops networking programs in Go. He enjoys the simplicity and first-class treatment of concurrency, and is excited about Rust's promise of "fearless concurrency." He'd like to try Rust for more efficient use of memory and CPU, as well as its ability to do FFI well. When working with async Rust, Alan has the question: why not use coroutines / green threads / M:N threads?

[nikomatsakis]

I'd be happy to add such a variant, I would also love to hear if there are more specific stories that result from it.