They always had their own version of the compiler: https://github.com/ocaml-flambda/ocaml-jst/tree/main https://github.com/ocaml-flambda/ocaml-jst/tree/main Ma

They always had their own version of the compiler: https://github.com/ocaml-flambda/ocaml-jst/tree/main https://github.com/ocaml-flambda/ocaml-jst/tree/main Many of their changes have been ported to the 'official' OCaml compiler.