[Haskell-cafe] Haskell-Cafe Digest, Vol 106, Issue 38

[Richard O'Keefe]

On 27/06/2012, at 12:51 PM, John Lato wrote:
> 
> data Tree a = Leaf a | Branch (Tree a) ( Tree a)
>  deriving (Foldable, Show)

While I am familiar with deriving (Show),
I am not familiar with deriving (Foldable),
which looks rather useful.

http://www.haskell.org/ghc/docs/7.4.2/html/users_guide/deriving.html
just says "With -XDeriveFoldable, you can derive instances of the
class Foldable, defined in Data.Foldable." but it provides no details.

Would you care to explain more about deriving (Foldable)?