leanprover-community / leanprover-community/mathlib4
cases' and unsynthesized placeholder
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- Dominant language
- Lean
- Stars
- 4.2k
- Forks
- 1.7k
- PR merge metrics
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Description
cases' currently suffers from the same bug as rcases reported here: https://github.com/leanprover/lean4/issues/5723
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 reading the linked Lean issue 5723 and reproducing the reported behavior for rcases, then compare it with the cases' behavior described here. Identify the relevant mathlib4 tactic entry point and add a regression test showing that the unsynthesized placeholder is handled correctly.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100