Ollie: It's for giving my own instances. I suspect most of the reasons that comonads feel uninteresting is that they've been relegated to a second-class citizen in the ecosystem.

chessai: I'm not proposing the whole package; just the class. I can't imagine the migration path is any harder than putting an ifdef into the comonads package.

On Fri, Sep 11, 2020 at 12:06 PM chessai <chessai1996@gmail.com> wrote:

Hi Sandy,

I think this would be a good candidate for the new Libraries Proposal process, modelled after ghc-proposals. See https://github.com/haskell-core/core-libraries-proposals

I recommend writing a proposal there. In particular, for changes like this, one of the things that needs the most thought is the story around a migration path.

Hope this helps.

Thanks

On Fri, Sep 11, 2020, 13:55 Sandy Maguire <sandy@sandymaguire.me> wrote:
Hi all,

I frequently regret the lack of having the Comonad class in base. Are there any good reasons for its absence? If not, I can get started on a patch.

Best,
Sandy
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