split with h
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Description
Proposal
Upgrade the split tactic so split with h names the new hypothesis.
Currently we need split <;> rename_i h as a workaround.
This syntax is available in Mathlib's split_if, but we would prefer not to upstream that implementation to Std.
Impact
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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 implementation and tests for the split tactic, then compare its behavior with the existing Mathlib split_if syntax and the rename_i workaround. Done means split with h names the new hypothesis in the same situation where split <;> rename_i h is currently required.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100