Thank you to all 3 of you! That helped a lot! karczma wrote:
Stephan Zaubzer writes:
Here my attempts: data Entry a = EmptyEntry | MakeEntry a a showEntry :: (Show a) => Entry a -> String showEntry EmptyEntry = "Empty" showEntry MakeEntry a b = show a ++ ": " ++ show b what am I doing wrong? I have seen this way on some tutorials.
I believe that if you looked cautiously at the system response you would guess yourself. Parentheses missing, it should be showEntry (MakeEntry a b) = ... Jerzy Karczmarczuk ... who has a pleasure of correcting thousands students' programs per year, so this kind of error burns his eyes...
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