Re: [Haskell-cafe] definition of data

You need some type constructor: data Tree a = Leaf a | Branch (Tree a) (Tree a) Am 01.01.2009 um 08:32 schrieb Max.cs:

hi all, I want to define a data type Tree a that can either be a or Branch (Tree a) (Tree a)?

I tried

data Tree a = a | Branch (Tree a) (Tree a) deriving Show

but it seems not accpetable in haskell ?

any way I could achieve this ?

Thanks

max _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe