Oh sorry I just realized you did ! On Sun, Mar 11, 2012 at 07:10:28PM +0000, bahadýr altan wrote:
Hi, I'm trying to process on a tree with this function :
f (Branch x (Branch y y1 y2) (Branch z z1 z2)) = (x,y,y1,y2,z,z1,z2)
and my tree declaration is this :
data Tree = Empty | Branch Integer Tree Tree deriving (Show)
And I'm getting this error :
Main> f (Branch 12 (Branch 15 Empty Empty) (Branch 28 Empty Empty)) ERROR - Cannot find "show" function for: *** Expression : f (Branch 12 (Branch 15 Empty Empty) (Branch 28 Empty Empty)) *** Of type : (Integer,Integer,Tree,Tree,Integer,Tree,Tree)
I'll be happy if you help me to get rid of this error..
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