ndmitchell / ndmitchell/hlint

`hlint` flags multiline warnings incorrectly under CPP

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Dominant language
Haskell
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Description

For example, hlint incorrectly thinks that the trailing double backslash is wrong:

https://github.com/input-output-hk/cardano-node/pull/1685

Explanation of why here:

https://gitlab.haskell.org/ghc/ghc/-/issues/10230

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the multiline warning described in the issue, using the linked Cardano PR as the example and the GHC issue for CPP behavior. Trace how hlint handles the trailing double backslash under CPP; done means valid multiline warnings are no longer flagged incorrectly.

Written by the indexing model from the issue text.

Assessment

Tech stack
haskell
Domain
tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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