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Would you be able to venture a guess why they are not more popular? I agree that basing Rust's concurrency on an Erlang-like model would not have been a good idea, for reasons mentioned in this thread. Nevertheless the sheer convenience of Erlang-style concurrency would nevertheless be useful in quite a few scenarios where Rust is used.

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I'm asking because I'm considering developing an Erlang-like approach to message-passing concurrency for Rust.

[steveklabnik]

I dunno, it just seems philosophically divergent. Rust isn't afraid of sharing, that's kinda the whole point.

actix was a big one, but actix-web ended up moving off of it, so I'm not sure what the state of it is.