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📝 Element.

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Rob Rix 2019-10-08 15:08:17 -04:00
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semantic-tags/src/AST/Element.hs
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@ -6,6 +6,7 @@ module AST.Element
import GHC.Generics
import GHC.TypeLits (ErrorMessage(..), TypeError)
-- | Projection of an element out of a tree of sums, particularly suitable for use with highly branching (e.g. balanced) trees.
class Element sub sup where
prj :: sup a -> Maybe (sub a)