Brent Yorgey wrote:
One comment: it looks like (add exp1 exp2), (and exp1 exp2) and so on above are not correct. The second argument of foldExp is a value of type Exp, so you are pattern-matching on the constructors of Exp, and constructors are always uppercase. Perhaps Exp has constructors named Add, And, and so on? Then you would want to do something like
Yepp, it's my fault I wasn't too precise in my explanation. There's a declaration of the data type EXP, which is not difficult to gess with the things I've said: data Exp = LitI Int |LitB Bool |Add Exp Exp |And Exp Exp |If Exp Exp Exp I'm going to read carefully all of your answer now (thanks to all!!!), and then I'll tell you. ;) -- View this message in context: http://www.nabble.com/foild-function-for-expressions-tf4932877.html#a1415512... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.