File "t08bad.ml", lines 10-11, characters 0-71:
10 | module rec A : sig type 'a t = <m: 'a list B.t; n: 'a array B.t> end
11 |              = struct type 'a t = <m: 'a list B.t; n: 'a array B.t> end
Error: This recursive type is not regular.
       The type constructor A.t is defined as
         type 'a A.t
       but it is used as
         'a array A.t
       after the following expansion(s):
         < m : 'a list B.t; n : 'a array B.t > contains 'a array B.t,
         'a array B.t = 'a array A.t
       All uses need to match the definition for the recursive type to be regular.