One thing that's been missed in this discussion is that constraints
can propagate.
Of course no one is wanting to pass something they know is a tuple
into a function they know is length. But a function that expects
something Foldable might want to know length or sum, and it might be
reasonable to call that function on a tuple.
On Sun, Apr 23, 2017 at 11:52 PM, Jonathon Delgado
Tony Morris - please could you give a (practical) example of code where the a tuple could realistically be passed to length, but you don't know what the answer will be at compile time?
Michael Orlitzky - everything in .NET has to descend from Object because of it's OO design. Why does tuple have to implement Foldable if it doesn't provide any useful functions?
Thank you very much everyone in this thread for helping me understand! _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners