Add instance Data a => Data (ZipList a) to base

[David Feuer]

I don't think we really need to go through the proposal process to add a
Data instance when we already have a Generic instance or vice versa.

On Sun, Nov 3, 2019, 9:29 AM Mario <blamario at rogers.com> wrote:

> I'm surprised this is missing. All newtypes exported from
> Control.Applicative share the same issue, with the exception of Const.
>
>
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