Functor, Applicative, Monad, Foldable, Traversable instances for (, , ) a b

Henning Thielemann lemming at
Fri Mar 31 17:24:03 UTC 2017

On Fri, 31 Mar 2017, Herbert Valerio Riedel wrote:

> On Thu, Mar 30, 2017 at 10:47 PM Bryan Richter <b at> wrote:
>       I just don't know why pairs ever got to Functor. I fear this was an ancient decision... no?
> If you're curious, this happened over 10 years ago:

Interesting. The Functor instance for pairs was added together with the 
Functor instance for functions. But the Monad instance for pairs came 
later, right?

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