leanprover-community / leanprover-community/mathlib4
Linter for unused `variable` declarations
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- Lean
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Description
In the same way we have a linter for to detect an unused argument of a function or lemma, we should have a linter to detect an unused variable declaration. I realized we have many of them.
Contributor guide
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 the existing linter for unused function or lemma arguments and read its implementation and tests. Add equivalent coverage for unused variable declarations, with done defined as the linter reporting declarations that are never used while leaving used declarations unreported.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100