[Haskell-cafe] Inheritance and Wrappers

Ozgur Akgun ozgurakgun at gmail.com
Tue Feb 1 12:47:34 CET 2011

On 1 February 2011 11:41, John Lato <jwlato at gmail.com> wrote:

> The important point is that this declares an AbGroup instance for every
> type, not just types with Num instances.

So, is there a way to declare an AbGroup instance for the types with num
instances only?

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