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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