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There is currently a problem with OCaml's pprintast/ppxlib in that it generates "raw identifiers" like
\#modulewhich are not valid in OCaml below 5.2.0See ocaml/opam-repository#28610 (comment) for some discussion.
I think this will be fixed upstream, but bumping to OCaml 5.3.0 seems useful anyway. (We can also work around it by using
" module"instead of"module"in lib/GenCtypes.ml, but that's nasty.)PS. I looked at adding a Nix CI, but adding
checkPhase = "make test"didn't work for me. I also have no idea how to change the dependencies such as this OCaml version, so I would leave changing the CI to someone else.