Hi,

This is just a test so I'm not much concerned, but I have these definitions:

type z
type _ s
type (_, _, _) balance =
  | Less : (*∀'a.*) ('a, 'a s, 'a s) balance
  | Same : (*∀'b.*) ('b, 'b, 'b) balance
  | More : (*∀'a.*) ('a s, 'a, 'a s) balance
type _ aVL =
  | Leaf : z aVL
  | Node : (*∀'a, 'b, 'c.*)('a, 'b, 'c) balance * 'a aVL * int * 'b aVL ->
    ('c s) aVL

and I get the error for "type _ aVL =":

Error: In this definition, a type variable cannot be deduced
       from the type parameters.

What to do?

Regards,
Łukasz "lukstafi"