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📝 the left-recursive instance.

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Rob Rix 2019-10-08 15:41:10 -04:00
parent 579e5792e8
commit 5242e394df
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semantic-tags/src/AST/Element.hs
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@ -49,6 +49,7 @@ class Element' (side :: Side) sub sup where
instance Element' 'Here t t where instance Element' 'Here t t where
prj' = Just prj' = Just
-- | Membershp on the left.
instance Element t l instance Element t l
=> Element' 'L t (l :+: r) where => Element' 'L t (l :+: r) where
prj' (L1 l) = prj l prj' (L1 l) = prj l