leanprover-community / leanprover-community/mathlib4
sometimes `rw` worked in mathlib3 but we had to change to `erw`
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lean4-change-in-behaviour
- Dominant language
- Lean
- Stars
- 4.1k
- Forks
- 1.7k
- PR merge metrics
- No merged PRs in 30d
Description
This issue has no description.
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
The issue names only the rw/erw behavior and provides no files, tests, or reproducer. Start by locating affected mathlib4 examples and comparing them with the mathlib3 behavior; done means the case and expected behavior are documented clearly enough to guide a change or explanation.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100