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Rob Rix 2019-10-08 15:40:48 -04:00
parent 607f8263a5
commit acbb1e7cd5
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semantic-tags/src/AST/Element.hs
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@ -36,6 +36,7 @@ type family Find' (side :: Side) sub sup :: Side where
Find' s t (l :+: r) = Find' s t l <> Find' s t r Find' s t (l :+: r) = Find' s t l <> Find' s t r
Find' _ _ _ = 'None Find' _ _ _ = 'None
-- | Return the leftmost non-'None' side, or 'None'.
type family (a :: Side) <> (b :: Side) :: Side where type family (a :: Side) <> (b :: Side) :: Side where
'None <> b = b 'None <> b = b
a <> _ = a a <> _ = a