jaredly / jaredly/reason-language-server
Adding `(preprocess (pps ppx_deriving.std)))` results in an error on each file.
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- OCaml
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Description
When I add `(preprocess (pps ppx_deriving.std)))` in dune, I get following error on each file:
```
Fatal error: exception Invalid_argument("Filename.chop_suffix") File "", line 1: Error: Error while running external preprocessor Command line: /home/thomas/Workspace/playing_with_projections_group/stream/_esy/default/store/b/quizzy_stream-28064658/default/.ppx/30a18adec0a1407675322d723bf1b0ae/ppx.exe --as-ppx --cookie 'library-name="lib"' '/tmp/camlppxb5ad57' '/tmp/camlppx92bc2d'
```
removing the preprocess fixes it. I'm using version 1.6.1 with vim.
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Research direction
Start by reproducing the failure with the reported dune `(preprocess (pps ppx_deriving.std))` configuration and the ppx_deriving 1.6.1 setup. Trace how the language server invokes the external preprocessor, using the shown `ppx.exe --as-ppx` command as the entry point. Done means preprocessing succeeds for every file without the `Filename.chop_suffix` exception.
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Assessment
- Tech stack
- ocaml
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100