I've long admired OCaml, but never used it really. I picked up Rust a while ago and actually made some use of it. I love the language a lot, but it is still too

I've long admired OCaml, but never used it really. I picked up Rust a while ago and actually made some use of it. I love the language a lot, but it is still too immature and low level for my current situation. I ended up using F# as the compromise, which has been amazing. There are some areas where OCaml is more advanced than F# (functors, the codegen from the optimized compiler, lack of the msbuild barf sandwich, less hacky on non-Windows platforms), but there are also plenty of areas where F# is more advanced than OCaml (computation expressions, code interoperability, real 32 and 64 bit integers, agents, multicore runtime). I would say that if OCaml was ideal for you except for the lack of parallelism, then you should definitely check out F# before you go all the way to Rust. Rust is awesome and for the right use case you should use it, but F# is a lot closer to OCaml than Rust is.