Suggest DeriveAnyClass
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- Dominant language
- Haskell
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Description
We can write
data Foo = { x, y, z :: T }
instance C1 Foo
instance C2 Foo
as just
data Foo = { x, y, z :: T } deriving (C1, C2)
Could HLint suggest this?
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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 locating HLint's rules for data declarations and standalone instance declarations, then inspect nearby tests for suggestion patterns. Add coverage for the shown C1 and C2 transformation, including the expected suggested deriving clause; done means HLint reliably suggests the equivalent combined declaration.
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