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If you could spare some time, would you please demonstrate an example? Any language of those mentioned would be OK.

Here's a Rust example, with tokio: https://play.rust-lang.org/?version=stable&mode=debug&editio... - I don't have time to come up with Java/C++ examples, but I'm sure others will.

(If your point was about it being _built into the language_, then it definitely stands, see the other discussion in the parent comment thread)

Yeah, I guess I overestimated the complexity of such mechanisms. I mean, still, you need some kind of runtime for the asynchronicity, but the Rust version seems fairly OK (apart from the function coloring, but that's another story).

I guess I just like it being built into the language. Plus no function coloring (everything is asynchronous, but appears synchronous) really makes it easy to build complex systems.

Here's a rust example - https://github.com/autarch/channel-select

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