Proposal: Add a catamorphism on Trees

[Edward Kmett]

No objection here.

+1

On Tue, May 17, 2016 at 5:03 PM, David Feuer <david.feuer at gmail.com> wrote:

> Daniel Wagner would like to add the following straightforward function
> to Data.Tree. I think this is a grand idea.
>
> foldTree :: (a -> [b] -> b) -> Tree a -> b
> foldTree f = go
>   where
>     go (Node x ts) = f x (map go ts)
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