leanprover-community / leanprover-community/mathlib4
Regression after disabling `ConcreteCategory.instFunLike` as a global instance
Open
Nobody has claimed this yet.
- Dominant language
- Lean
- Stars
- 4.1k
- Forks
- 1.7k
- PR merge metrics
- No merged PRs in 30d
Description
#13170 disables the accidentally global instance ConcreteCategory.instFunLike. This results in some rws and simps being replaced by erw
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
Read #13170 and inspect the effects of disabling ConcreteCategory.instFunLike on the affected rw and simp uses. Confirm which cases now require erw, then identify a focused change that restores the intended rw or simp behavior without the global instance; done means those regressions no longer require erw.
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
- 35/100