[Haskell] Re: Overloading show

[karczma]

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...