Yes, (and so is OCaml) but less than in the past, mostly for specialized and older projets. Most engineers at Meta will not encounter these languages. It's costly to integrate them with the internal tools and arguably not worth the effort. On the other hand, Rust is increasingly popular and well-supported and approved by the company.
I think one of the most promising pitches for rust adoption is that it borrowed as much as possible from Haskell/ML without treading into the territory where it becomes "scary" for broadly-C-family language monoglots. A C++ or even Java programmer can look at Rust and think to themselves "this text has a comfortably familiar shape".
Wonder if Haskell is still around at Meta these days, does anybody know?
Yes, (and so is OCaml) but less than in the past, mostly for specialized and older projets. Most engineers at Meta will not encounter these languages. It's costly to integrate them with the internal tools and arguably not worth the effort. On the other hand, Rust is increasingly popular and well-supported and approved by the company.
I think one of the most promising pitches for rust adoption is that it borrowed as much as possible from Haskell/ML without treading into the territory where it becomes "scary" for broadly-C-family language monoglots. A C++ or even Java programmer can look at Rust and think to themselves "this text has a comfortably familiar shape".
Mostly discouraged in new projects.
Looks like the author is now working on Glean (the AI docs/search tool) at Meta, which is also Haskell-based.
Simon Marlow is a famous Haskell developer, alongside the likes of Simon Peyton-Jones or Philip Wadler