[IshKebab]

I think there are definitely aspects of Rust that OCaml/F# developers would find easy because it borrows a lot of syntax and concepts from ML. But to be honest those bits are the easy parts or Rust. Knowing OCaml or F# won't help with the borrow checker.

I think C++ programmers are probably the ones that are likely to find Rust easiest because they should be familiar with lifetimes even if they never really had to write them down.