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

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

On Thu, Mar 30, 2017 at 10:47 PM Bryan Richter 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:

http://git.haskell.org/ghc.git/commitdiff/209bf03ac7949c9bcf677561a2b1360b15...

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