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Rust async streams or rayon come very close to what you describe as structured concurrency. Actually much closer than anything I saw in other mainstream languages eg Java or Go.

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Rayon is about as pure an example of it as you can imagine. In a lot of cases you just need to replace iter() with par_iter() and it just works.

scoped threads as well, though at a lower level of semantics (and probably less efficiently due to not being on top of a thread pool).

> Actually much closer than anything I saw in other mainstream languages eg Java or Go.

https://github.com/sourcegraph/conc

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