Bad documentation of Jane Street libraries

1. ppx_jane

   1 1 33 4.0 Makefile

   Standard Jane Street ppx rewriters

   

   I am trying to pick up OCaml again and want to use Base/Core, but I keep hitting walls due to the bad documentation. As an example, I wanted to use ppx_deriving so that I could add [@@ deriving show] to my types. But dune says "No driver were found" and that this is not a PPX rewriter. I googled and found that dune documentation recommends "ppx_jane". Then I googled what is "ppx_jane" and found just one sentence:

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3. ppx_base

   2 1 3 3.5 Makefile

   Base set of ppx rewriters

   

   Then I went into kernel/src/dune and it lists a bunch of more ppx_ libraries. The first one is ppx_base which I googled and that has no documentation or README.

4. ppx_deriving

   3 7 481 6.3 OCaml

   Type-driven code generation for OCaml

   

   is from https://github.com/ocaml-ppx/ppx_deriving

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