feat: MonadAttach
#11532
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feat: MonadAttach
#11532
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eric-wieser
reviewed
Dec 8, 2025
| abbrev ReaderM (ρ : Type u) := ReaderT ρ Id | ||
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| instance [Monad m] [MonadAttach m] : MonadAttach (ReaderT ρ m) where | ||
| CanReturn x a := Exists (fun r => MonadAttach.CanReturn (x.run r) a) |
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I realize this is a draft PR, but this seems slightly fishy to me; I worry there are cases where you need to constrain r with a predicate.
Contributor
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Thanks for taking a look! I believe to have proven this to be a sound and strongest postcondition:
<https://github.com/leanprover/lean4/pull/11532/files#diff-184d01e2db4041ff3005df8db105c00db20c4f7b16b069cc9d504aafa58a337dR12>
Is there a desirable property missing in `LawfulMonadAttach` or what kind of constraint are you thinking about?
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TBA