leanprover / leanprover/fp-lean
TreeError.append is not associative - thus, the corresponding Validate is not an applicative functor
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@david-christiansen is already working on this.
Since Aug 6, 2023.
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Description
See this comment: https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Functional.20Programming.20in.20Lean
The exercises in the book should not have readers breaking the law - the exercise should be replaced with a better one!
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