[Haskell-cafe] How to fix such a TYPE problem ?

Luke Palmer lrpalmer at gmail.com
Mon Aug 31 23:54:49 EDT 2009

On Mon, Aug 31, 2009 at 9:47 PM, zaxis<z_axis at 163.com> wrote:
>>let [y,m,d] = map (\x -> read x::Int) $ splitRegex (mkRegex "-")
> "2009-08-31"
>>fromGregorian y m d
> Couldn't match expected type `Integer' against inferred type `Int'
>    In the first argument of `fromGregorian', namely `y'
>    In the expression: fromGregorian y m d
>    In the definition of `it': it = fromGregorian y m d

fromGregorian is expecting an Integer for y, and you gave it an Int.
You just need to convert; fromIntegral works fine for this.

fromGregorian (fromIntegral y) m d

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