On Sat, Oct 2, 2010 at 10:47 AM, ben kuin <benk...@gmail.com> wrote: >> >> # let t x = match x with >> a when x<=4 -> true >> | _ -> false;; >> > > ok, I had a similar attempt with > > let tt x = function > a when x<=4 -> true > | _ -> false;; > > but that gave me the following (scary -> 'a -> ) signature > > val tt : int -> 'a -> bool = <fun> > > so I stopped > > thanks anyway >
This seems to be a common beginner mistake (hence the reference to the beginner's list). You defined tt as a function which takes two arguments, x and another matched by "function" - which tt ignores the value of (a when x <= 4). The pattern-matched value is never used, therefore it can be any type. Hope this helps, Hez _______________________________________________ Caml-list mailing list. Subscription management: http://yquem.inria.fr/cgi-bin/mailman/listinfo/caml-list Archives: http://caml.inria.fr Beginner's list: http://groups.yahoo.com/group/ocaml_beginners Bug reports: http://caml.inria.fr/bin/caml-bugs
