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

[Mario Blažević]

On 2019-11-04 10:23 a.m., David Feuer wrote:
> 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.

What should I do instead? Open an issue? The bug tracker link on Hackage 
is broken, BTW. It works without the last path component.

http://ghc.haskell.org/trac/ghc/newticket?component=libraries/base