+1 from me.
We routinely supply instances for tuples of up to 4 or 5 elements
elsewhere.
There is no need to be randomly inconsistent here.
-Edward
On Mon, Jan 18, 2016 at 3:10 PM, David Feuer
For some reason I really can't imagine, it seems the only tuple type with a Functor instance is (,) a. I was astonished to find that
fmap (+1) (1,2,3)
doesn't work. Since this is *useful*, and there is *only one way to do it*, I propose we add the following:
instance Functor ((,,) a b) where fmap f (a,b,c) = (a,b,f c) instance Functor ((,,,) a b c) where fmap f (a,b,c,d) = (a,b,c,f d) etc.
I would really love to see these make 8.0.0, but if that's impossible then so be it. _______________________________________________ Libraries mailing list Libraries@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/libraries