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📝 ShowSum.

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Rob Rix 2019-10-08 15:42:21 -04:00
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semantic-tags/src/AST/Element.hs
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@ -70,6 +70,7 @@ instance TypeError
prj' _ = Nothing prj' _ = Nothing
-- | Show a sum tree as a set (for use in type errors).
type family ShowSum t where type family ShowSum t where
ShowSum (l :+: r) = ShowSum' ('Text "{ ") (l :+: r) ':$$: 'Text "}" ShowSum (l :+: r) = ShowSum' ('Text "{ ") (l :+: r) ':$$: 'Text "}"
ShowSum t = 'Text "{ " ':<>: 'ShowType t ':<>: 'Text " }" ShowSum t = 'Text "{ " ':<>: 'ShowType t ':<>: 'Text " }"