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Why Rust is the most admired language among developers?
(github.blog)
Welcome to the Rust community! This is a place to discuss about the Rust programming language.
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First things first: I haven't fully thought this through, as I haven't attempted to implement it (yet). It was just an idea I had while working on higher-free-macro.
It wouldn't yield the same syntax of course, but you could express the flow of the async computation in the terms of a Free Monad based embedded domain specific language. The interpreter for the eDSL in question would then do the equivalent of the async runtimes we have currently.
I could imagine that the syntax could be pretty nice when using the do-notation from higher.
However, since I haven't tried implementing it, I can't say for certain that there aren't any hard walls one could hit, especially related to Rust's ownership model, or more complex dependency trees.