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
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