"argument already set"-error doesn't produce InfoTree
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@kmill is already working on this.
Since Aug 23, 2025.
bug
P-low
- Dominant language
- Lean
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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
example : True ∧ True :=
And.intro (left := trivial) (left := trivial)
-- given and expected error: argument 'left' was already set
mousing over And.intro or jumping to its definition doesn't work
Context
Related to #3831 and #5336
Impact
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Contributor guide
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Assessment
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