An introduction to OCaml PPX ecosystem (opens in new tab)

These last few months, I spent some time writing new OCaml PPX rewriters or contributing to existing ones. It's a really fun experience. Toying around with the AST taught me a lot about a language I thought I knew really well. Turns out I actually had no idea what I was doing all these years. All jokes aside, I was surprised that the most helpful tricks I learned while writing PPX rewriters weren't properly documented. There already exist a few very good introduction articles on the subject, ...