I think there was some discussion of this recently. We already have V1 in GHC.Generics; perhaps that could be given a better name.

On Feb 15, 2017 6:55 PM, "Bryan O'Sullivan" <bos@serpentine.com> wrote:

On Wed, Feb 15, 2017 at 3:31 PM, Michael Walker <mike@barrucadu.co.uk> wrote:
I left this sitting alone in a Utils module until last night when I saw
someone ask in #haskell if there was "a Void1 type defined in some
central place". So, in case this is of more general interest, I propose
that a module Data.Functor.Void be added to base.

I think the bar for adding things to base is higher than "two people found it useful"...

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