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📝 Element'.

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Rob Rix 2019-10-08 15:40:54 -04:00
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semantic-tags/src/AST/Element.hs
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@ -41,6 +41,7 @@ type family (a :: Side) <> (b :: Side) :: Side where
'None <> b = b
a <> _ = a
-- | Helper to project elements out of the matching portion of a tree.
class Element' (side :: Side) sub sup where
prj' :: sup a -> Maybe (sub a)