by the way, i don't think i'm on the cvs-ghc list. so please cc me in any
replies. thanks, - conal
On 8/15/07, Conal Elliott <[EMAIL PROTECTED]> wrote:
>
> I'm running ghc-6.7.20070802 and getting a new error message that didn't
> show up with ghc-6.6. Code:
>
> -- | Pairing for unary type constructors.
> newtype Pair1 f g a = Pair1 {unPair1 :: (f a, g a)}
> deriving (Eq, Ord, Show)
>
> Error message:
>
> src/Data/Tupler.hs:26:0:
> No instances for (Show (g a), Show (f a))
> arising from the 'deriving' clause of a data type declaration
> at src/Data/Tupler.hs:(26,0)-(27,25)
> Possible fix:
> add an instance declaration for (Show (g a), Show (f a))
> When deriving the instance for (Show (Pair1 f g a))
>
> Has there been a change to "deriving"? Is there a workaround?
>
> Thanks, - Conal
>
>
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