[Haskell-beginners] exception, not in IO

[Kees Bleijenberg]

Jedaï

......
We discover that this function is pretty simple in fact and combine some pure code that does provide pure exceptions, so defining a new function may bring a solution :

tryDecodingJSON :: (Data a) => String -> Result a tryDecodingJSON s =
    case runGetJSON readJSValue s of
    Left msg -> Error msg
    Right j -> fromJSON j

You may need to import Text.JSON.String for runGetJSON.
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This is a nice solution for the problem. 
Thanks!

Kees