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> Now of course if you want the async coding model with all it's benefits (selection, cancellation), then there is really no escaping it

Isn't Go proof that this works just fine, arguably even better, with the blocking model?

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It definitely can work, but Rust's model is incredibly powerful, and can make it easy to model complex control flow. Certain patterns, such as cancellation, can get pretty hairy in Go, although this is a place where Rust has some work to do as well :).

Yeah, but those complex control flows are not free. Drop-to-cancel is a rather powerful foot gun in many cases. Basically you throw out invariants that most people takes for granted, e.g. if a function is started it will complete before exiting the caller's scope.

Regarding cancelation, I think Go got it near perfect with contexts, modulo the explicitness of it. What don't you like about it?

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