[Haskell-cafe] foild function for expressions

[Carlo Vivari]

Yes,as  I said before to other of you
the exp data type was also declared in the exercise (my fault not to say
it), and look as this:

data Exp = LitI Int 
               |LitB Bool 
               |Add Exp Exp 
               |And Exp Exp 
               |If Exp Exp Exp 

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