Add missing Monad/Traversable instances to tuples

Henning Thielemann lemming at
Tue Apr 2 06:53:10 UTC 2019

On Tue, 2 Apr 2019, Fumiaki Kinoshita wrote:

> I submitted but it 
> might be still controversial. I'd like to get more opinions again.

I think we discussed such instances at length in the past. Unfortunately, 
I cannot find the old discussion. At least here is a reddit discussion:

If I would use such an instance in my code this would be an accident and a 
programming error. That's why I would want to have instance warnings 

Btw. what happened to GHC-Trac? Now I need JavaScript to see the comments. 

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