Among the big changes that came with OCaml 5, concurrency via effect handlers was introduced alongside the I/O library Eio, letting users take advantage of effects to write more efficient concurrent programs. In an exciting new project, we are transitioning one of the biggest OCaml open source projects, Ocsigen, from Lwt concurrency to concurrency using effects. The most exciting part of this project is that we will develop tools to automate parts of the transition and document how we achieve...