> Id is an operation over types yielding a type, as such it doesn't make > much sense to me to have (Id a -> Id a) but rather something like (a -> > Id a).
Actually, it can make perfect sense: e.g. if the `Id' function acts as a constraint. Stefan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe