[Haskell-cafe] Deepest polymorphic functor

[Eduard Sergeev]

Ryan Ingram wrote:
> 
> What would this do with
> 
>   instance Num a => Num [a]
> 
> in scope?
> 

It should work not only for Num a anyway (like normal Functor would do) but
if you could give me an example, how exactly could I use Num a here...
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