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Simplify with a foldMap.

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Rob Rix 2017-09-10 18:34:42 +01:00
parent 36ac6a4104
commit b4ca3be640
1 changed files with 1 additions and 1 deletions
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src/Diff.hs
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@ -220,6 +220,6 @@ instance (ToJSONFields a, ToJSONFields1 f) => ToJSONFields (Diff f a) where
toJSONFields = toJSONFields . unDiff
instance (ToJSON b, ToJSONFields a, ToJSONFields1 f) => ToJSONFields (DiffF f a b) where
toJSONFields (Copy vs a f) = foldr (\ (Metavar k, v) -> (pack k .= v :)) [] vs <> toJSONFields a <> toJSONFields1 f
toJSONFields (Copy vs a f) = foldMap (\ (Metavar k, v) -> [pack k .= v]) vs <> toJSONFields a <> toJSONFields1 f
toJSONFields (Var (Metavar v)) = [ "metavar" .= v ]
toJSONFields (Patch a) = toJSONFields a