Submission #1520491

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Source Code Expand

main = interact $ show . maximum . map read . words

Submission Info

Compile Error

Main.hs:1:19:
    No instance for (Show a0) arising from a use of ‘show’
    The type variable ‘a0’ is ambiguous
    Note: there are several potential instances:
      instance (Show a, Show b) => Show (Either a b)
        -- Defined in ‘Data.Either’
      instance forall (k :: BOX) (s :: k). Show (Data.Proxy.Proxy s)
        -- Defined in ‘Data.Proxy’
      instance (GHC.Arr.Ix a, Show a, Show b) => Show (GHC.Arr.Array a b)
        -- Defined in ‘GHC.Arr’
      ...plus 28 others
    In the first argument of ‘(.)’, namely ‘show’
    In the second argument of ‘($)’, namely
      ‘show . maximum . map read . words’
    In the expression: interact $ show . maximum . map read . words

Main.hs:1:26:
    No instance for (Ord a0) arising from a use of ‘maximum’
    The type variable ‘a0’ is ambiguous
    Note: there are several potential instances:
      instance (Ord a, Ord b) => Ord (Either a b)
        -- Defined in ‘Data.Either’
      instance forall (k :: BOX) (s :: k). Ord (Data.Proxy.Proxy s)
        -- Defi...