leanprover-community / leanprover-community/lean
`[ ... ] tactics produce output in other files
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- Dominant language
- C++
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Description
A tactic `[ t ] used in a tactic definition my_tac at line L column C in file X that is used in file Y produces output (a server message) at line L column C of file Y (independent of where the tactic my_tac was used in file Y).
See https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/Extension.20showing.20goal.20for.20a.20separate.20lemma for more information and a less cryptic 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
Reproduce the reported behavior using a tactic definition containing [ t ] in file X and a use from file Y, tracking the reported line and column. Compare the tactic definition location with the server message location and consult the linked Zulip discussion to determine the expected output location; done means the message points to the actual use site.
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
- 25/100