Can't annotate data type
Nobody has claimed this yet.
- Dominant language
- Haskell
- Stars
- 1.6k
- Forks
- 210
- PR merge metrics
- No merged PRs in 30d
Description
I want to ignore the "Use newtype instead of data" rule for a single line, like
{-# ANN Person "HLint: ignore Use newtype instead of data" #-}
data Person
= Employee Int
-- TODO: add Boss
But then GHC errors with Not in scope: data constructor 'Person'. If I try annotating the Employee constructor, then the hlint annotation doesn't suppress the rule anymore.
Workaround for now is to just ignore the rule in the entire module. Is there a better solution for this?
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the ANN Person example and its GHC “Not in scope” error, then compare it with annotating the Employee constructor. Investigate how HLint interprets these annotations and define a solution that suppresses only the Use newtype instead of data rule for the declaration without requiring a module-wide ignore.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- haskell
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100