Proposal: Functor and friends for the wrappers in Data.Monoid

Sean Leather sean.leather at
Sat Feb 21 19:57:21 UTC 2015

On Sat, Feb 21, 2015 at 8:51 PM, Oleg Grenrus wrote:

> Sean, is there a trac ticket for this issue? I could make a patch early
> next week, as this seems to be discussed previously.

No, please create one. Also, you could put a patch on Phab and share both
links here.

On Sat, Feb 21, 2015 at 9:44 PM, Joachim Breitner wrote:

> It’s Applicative and Monad that I’m unsure about.

Good point. I'm also unsure. Do we need/want Applicative, Monad, and
MonadFix instances that are analogues of Identity? Has anyone ever needed a
Sum/Product/First/Last monad?

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