[mjevans]

Thank you. Every time I've tried to approach the concept of Rust's parallelism this is what rubs me the wrong way.

I haven't yet read a way to prove it's correct, or even to reasonably prove a given program's use is not going to block.

With more traditional threads my mental model is that _everything_ always has to be interrupt-able, have some form of engineer chosen timeout for a parallel operation, and address failure of operation in design.

I never see any of that in the toy examples that are presented as educational material. Maybe Rust's async also requires such careful design to be safely utilized.

[zenmac]

Guess Rust is more built for memory safety not concurrency? Erlang maybe? Why can't we just have a language that is memory safe and built for concurrency? Like Ocaml and Erlang combine?

[jitl]

Are you looking for Gleam? Simple but powerful typed functional language for BEAM and JavaScript. It’s a bit high level compared to Ocaml in terms of needing a thick runtime and being somewhat far from machine code.

Really beautiful language design imo. Does a great job avoiding the typelevel brainfuck problem I have with Haskell.

https://gleam.run/

[kibwen]

Rust is absolutely built for concurrency, even moreso than for memory safety--it just so happens that memory safety is a prerequisite for thread safety. You're going to have a hard time finding any other industrial-strength language that statically prevents data races. If you can use Erlang, then sure, use Erlang. But if you can't use Erlang, and you need concurrency, you're not going to find a better candidate than Rust.