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📝 the reflexive instance.

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Rob Rix 2019-10-08 15:41:02 -04:00
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semantic-tags/src/AST/Element.hs
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@ -45,6 +45,7 @@ type family (a :: Side) <> (b :: Side) :: Side where
class Element' (side :: Side) sub sup where class Element' (side :: Side) sub sup where
prj' :: sup a -> Maybe (sub a) prj' :: sup a -> Maybe (sub a)
-- | Membership is reflexive.
instance Element' 'Here t t where instance Element' 'Here t t where
prj' = Just prj' = Just