Declarations with `@[elab_as_elim]` could elaborate as type-incorrect expressions. Reported by Jireh Loreaux [on Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/bug.20in.20revert/near/450522157). (In principle the elabAsElim routine could revert fvars appearing in the expected type that depend on the discriminants (if the discriminants are fvars) to increase the likelihood of type correctness, but that's at the cost of some complexity to both the elaborator and to the user.) |
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