On Tue, 2008-01-22 at 07:03 +0100, Cetin Sert wrote: > (¬) :: Bool → Bool > (¬) q = not q > > q = True > ¬ q : parser error on input > q ¬ : parser error (possibly incorrect indentation) > (¬ q) : Couldn't match expected type `Bool -> t' against inferred type > `Bool' In the expression: (� True) In the definition of `it': it = (� > True) * > (q ¬) : False > > (Why) is it not possible to define a (non-infix) function whose name > consists of a single non-alphabetical mathematical symbol?
Haskell does not support user-defined unary prefix operators, only infix. The only one is prefix negation -n. Duncan _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
