[Haskell] How to avoid both duplicate instances and extraneous instance declarations?

ihope ihope127 at gmail.com
Sat Apr 22 13:01:29 EDT 2006

On 4/22/06, Robin Bate Boerop <robin_bb at acm.org> wrote:
> This does not work.  The compiler gives the same error with or
> without "-fallow-overlapping-instances".

Just what is the error?

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