GHC.Generics and instances of Functor, Applicative, etc?

[Conal Elliott]

Lovely. Thanks!

On Tue, Jan 12, 2016 at 7:23 PM, Edward Kmett <ekmett at gmail.com> wrote:

> https://ghc.haskell.org/trac/ghc/ticket/9043 is the current ticket for
> tracking this and has more details.
>
> On Tue, Jan 12, 2016 at 8:28 PM, Conal Elliott <conal at conal.net> wrote:
>
>> I'm using GHC.Generics and have noticed that the data types defined there
>> don't have instances of the standard classes (at least not defined in that
>> module), such as Functor, Applicative, Foldable and Traversable. It'd be
>> very useful to be able to rely on such instances, so that one can define
>> instances of custom types via instances of the generic types. (Hopefully,
>> the compiler can remove most or all conversion overhead) Is there any
>> reason not to add these generic instances?
>>
>> -- Conal
>>
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>>
>
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