The key here is "The type variable ‘a0’ is ambiguous".
You need to add a type signature to age so the compiler know if age is of
type In,Float or Double ...
:)
2014-09-26 10:34 GMT-04:00 Miro Karpis
Hi, I'm trying to run an example from the eason documentation https://hackage.haskell.org/package/aeson-0.6.1.0/docs/Data-Aeson.html#g:3 :
λ> do result <- decode "{\"name\":\"Dave\",\"age\":2}" flip parseMaybe result $ \obj -> do age <- obj .: "age" name <- obj .: "name" return (name ++ ": " ++ show (age*2))
I made a function:
jsonTest = do result <- decode "{\"name\":\"Dave\",\"age\":2}" flip parseMaybe result $ \obj -> do age <- obj .: "age" name <- obj .: "name" return (name ++ ": " ++ show (age*2))
which can not compile: hh.hs:35:41: No instance for (Show a0) arising from a use of ‘show’ The type variable ‘a0’ is ambiguous .... ...
Please what am I doing wrong?
Cheers, Miro
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