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我導入此:對象已導入,但編譯器說,這是不是
import Data.Aeson (ToJSON(..), FromJSON(..), (.:), (.=), object, Object(..), decode)
而且我有這樣的:
instance FromJSON Data123 where
parseJSON (Object v) =
Data123 <$> v .: "a"
<*> v .: "b"
<*> v .: "c"
parseJSON _ = mzero
instance ToJSON Data123 where
toJSON (Data123 a b c) =
object ["a" .= a
, "b" .= b
, "c" .= c
]
而且我有一個錯誤說
Not in scope: data constructor ‘Object’
Perhaps you meant variable ‘object’ (imported from Data.Aeson)
我還沒有導入它嗎?