leanprover-community / leanprover-community/mathlib4
`simp` does not try applying `@[refl]` lemmas to close the goal
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lean4-change-in-behaviour
- Dominant language
- Lean
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Description
Hence some calls to simp or simp only now have to be followed by rfl.
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 reproducing the reported behavior of simp and simp only when @[refl] lemmas could close the goal. Verify that the completed behavior closes those goals without a following rfl; the issue does not name a file or test to begin with.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100