On Tue, Oct 14, 2008 at 8:20 PM, George Pollard <[EMAIL PROTECTED]> wrote:
>> Illegal instance declaration for `Stringable [Char]'
>> (All instance types must be of the form (T a1 ... an)
>> where a1 ... an are distinct type *variables*
>> Use -XFlexibleInstances if you want to disable this.)
>> In the instance declaration for `Stringable [Char]'
>
> 'Blah' isn't a type variable, is it? Is my brain just not working right
> today?
If you're stuck, this is a fairly arbitrary limitation and is easily
generalized. GHC, at least, implements the FlexibleInstances
extension. Put
{-# LANGUAGE FlexibleInstances #-}
At the top of the file and that will be an acceptable instance.
Luke
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