Hover for _ argument shows irrelevant information
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Description
Prerequisites
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- Check that your issue is not already filed:
https://github.com/leanprover/lean4/issues - Reduce the issue to a minimal, self-contained, reproducible test case.
Avoid dependencies to Mathlib or Batteries. - Test your test case against the latest nightly release, for example on
https://live.lean-lang.org/#project=lean-nightly
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Description
In
def f (_ : Nat) : Nat := 3
hovering over the _ shows A placeholder term, to be synthesized by unification. , but this is not really accurate in this situation.
Expected behavior: A relevant docstring.
Actual behavior: An irrelevant docstring.
Versions
4.12.0-nightly-2024-09-17 on live.lean-lang.org
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 with the minimal reproducer in the issue and inspect how hover information is generated for the _ argument. Trace the source of the placeholder docstring and compare it with the expected hover behavior; done means the hover shows information relevant to an explicitly unused argument.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers, devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100