Sorry! I've spotted it reading the email. (I should read before sending.) On Thu, Dec 19, 2013 at 11:17 PM, Lukasz Stafiniak wrote: > 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 > (here)