> Rust developers are insanely productive. If your baseline is a language that is missing some features that were in standard ML, sure. If you were already usi

> Rust developers are insanely productive. If your baseline is a language that is missing some features that were in standard ML, sure. If you were already using OCaml or F#, Rust doesn't make you any more productive. If you were already using Haskell or Scala, Rust's lack of HKT will actively slow you down.