siso dagbovie wrote: > I've defined the following datatype with haskell > > data Graph a b = Empty | Context a b & Graph a b > > But I am having the error message: " parse error on input `&' ". > I am wondering what it is wrong with my definition. How can I fix this?
Constructors have to start with a capital or a : (colon). So changing your definition into data Graph a b = Empty | Context a b :& Graph a b will work. If you want you can define (&) = (:&) and use the & symbol for constructing graphs (not in pattern matches though). HTH, -- Jochem Berndsen | joc...@functor.nl GPG: 0xE6FABFAB _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
