Objective Caml version 1.02+4

#   - : < x : int > ->
    < x : int > -> < x : int > -> < x : int > * < x : int > * < x : int > =
<fun>
#               class 'a c (unit) = constraint 'a = int method f : 'a c end
class 'a d (unit) = method f : int c end
#                 Characters 185-212:
The type variable 'a is not bound in implicit type definition
  d = < f : 'a -> unit >
It should be captured by a class type parameter
#             class virtual closed c (< f : int >) = virtual f : int end
class virtual closed d (< f : int >) = virtual f : int end
#     class virtual closed e (< f : int >) = virtual f : int end
#           class virtual closed c (c) = end
#             class virtual c (unit) = end
class 'a d (unit) = constraint 'a = < x : int; .. > method f : 'a -> int end
#               class 'a c (unit) = constraint 'a = int end
class 'a d (unit) = constraint 'a = int #c end
#               class closed 'a c ('a) = constraint 'a = 'a c method f : 'a end
# - : ('a c as 'a) -> 'b c as 'b = <fun>
#           Characters 118-143:
The class x should be virtual: its method f is undefined
#               Characters 184-187:
The class d inherits from the closed class c which has no method g
#           Characters 37-97:
The abbreviation c is used with parameters bool c
wich are incompatible with constraints int c 
#             class ('a, 'b) c (unit) =
  constraint 'a = int -> 'c
  constraint 'b = 'a * < x : 'b > * 'c * 'd
  method f : 'a -> 'b -> unit
end
#     class ('a, 'b) d (unit) =
  constraint 'a = int -> 'c
  constraint 'b = 'a * < x : 'b > * 'c * 'd
  method f : 'a -> 'b -> unit
end
#     val x : '_a list ref = {contents=[]}
#     class 'a c (unit) = constraint 'a = '_b list ref method f : 'a end
# - : unit -> '_a list ref c = <fun>
#       Characters 25-52:
The type abbreviation c is ill-defined
#   type 'a c = < f : 'a c; g : 'a d >
type 'a d = < f : 'a c >
#   type 'a c = < f : 'a c >
type 'a d = < f : int c >
#   type 'a u = < x : 'a >
type 'a t = 'a t u
#   Characters 19-32:
The type abbreviation t is cyclic
#   type t = < x : t >
# type 'a u = 'a
# - : t -> t u -> bool = <fun>
# - : t -> t u -> bool = <fun>
#                         module M :
  sig
    class ('a, 'b) c ('c) ('b) =
      constraint 'a = int -> 'd
      val x : 'e list
      val y : 'b
      method f : 'a -> unit
      method g : 'b
    end
  end
#                   module M' :
  sig
    class virtual ('a, 'b) c (int) ('b) =
      constraint 'a = int -> bool
      val x : float list
      val y : 'b
      method f : 'a -> unit
      method g : 'b
    end
  end
# class ('a, 'b) d (unit) ('b) =
  constraint 'a = int -> 'c
  val x : 'd list
  val y : 'b
  method f : 'a -> unit
  method g : 'b
end
# class ('a, 'b) e (unit) ('b) =
  constraint 'a = int -> bool
  val x : float list
  val y : 'b
  method f : 'a -> unit
  method g : 'b
end
# - : string = "a"
# Characters 1-9:
One cannot create instances of the virtual class M'.c
# - : int = 10
# - : float = 7.1
# # - : bool = true
#     module M : sig class closed 'a c (unit) = method f : 'a -> unit end end
#   module M' : sig class closed 'a c (unit) = method f : 'a -> unit end end
# - : < f : 'a -> unit; .. > -> 'a M.c = <fun>
# - : < f : 'a -> unit; .. > -> 'a M'.c = <fun>
# class 'a c ('b #c) = end
# class closed 'a c ('a c) = end
#     class c (unit) = method f : int end
class d (unit) = method f : int end
# class e (unit) = method f : int end
# - : int = 2
# Characters 23-27:
This expression has type bool but is here used with type int
#   class c (unit) = method f : int method g : int method h : int end
# class d (unit) = method h : int method i : int method j : int end
#               class e (unit) =
  method f : int
  method g : int
  method h : int
  method i : int
  method j : int
end
# val e : e = <obj>
# - : int * int * int * int * int = 1, 3, 2, 2, 3
#   class c ('a) = val a : 'a val x : int val y : int val z : int end
# class d ('a) = val b : 'a val t : int val u : int val z : int end
#                             class e (unit) =
  val a : int
  val b : int
  val t : int
  val u : int
  val x : int
  val y : int
  val z : int
  method x : int
  method y : int
  method z : int
  method t : int
  method u : int
  method a : int
  method b : int
end
# val e : e = <obj>
# - : int * int * int * int * int * int * int = 1, 3, 2, 2, 3, 5, 7
#             class c (int) (int) =
  val x : int
  val y : int
  method x : int
  method y : int
end
# class d (int) (int) =
  val x : int
  val y : int
  method x : int
  method y : int
end
# - : int * int = 1, 2
# - : int * int = 1, 2
#     class 'a c ('a) = end
# - : 'a -> 'a c = <fun>
#           module type M =
  sig class c (unit) = val x : int end class d (unit) = val x : bool end end
#         class c (int) = method get : int method set : int -> unit end
# val c : c = <obj>
# - : int = 5
# - : int = 7
#   class c (unit) = val x : int val y : int method c : int end
# class d (unit) = val y : int method c : int method d : int end
#     class e (unit) =
  val x : int
  val y : int
  method c : int
  method d : int
  method x : int
  method y : int
end
# - : int * int * int * int = 2, 1, 1, 1
#                           module M : sig class c (unit) = method xc : int end end
#         class d (unit) = val x : int method xd : int method xc : int end
# - : int * int = 1, 2
#         Characters 7-143:
The type variable 'a is not bound in implicit type definition
  'b matrix = < add : 'b matrix -> 'b; m : 'a >
It should be captured by a class type parameter
#   class c (unit) = method m : c end
# - : c = <obj>
# module M : sig class c (unit) = method m : c end end
# - : M.c = <obj>
#   type uu = A of int | B of (< leq : 'a > as 'a)
#   class virtual c (unit) : 'a = virtual m : 'a end
#         module S : sig val f : (#c as 'a) -> 'a end
#         Characters 12-43:
Signature mismatch:
Modules do not match:
  sig val f : (#c as 'a) -> 'a end
is not included in
  sig val f : #c -> #c end
Values do not match:
  val f : (#c as 'a) -> 'a
is not included in
  val f : #c -> #c
#   Characters 32-48:
Multiple definition of the type name t.
Names must be unique in a given structure.
#   - : (< m : (< m : 'b -> 'b > as 'b) -> 'a; .. > as 'a) ->
    < m : 'c -> 'c > as 'c = <fun>
#   Characters 10-39:
Type int -> bool is not a subtype of type int -> int
Type bool is not a subtype of type int
# Characters 9-40:
Type int -> bool is not a subtype of type int -> int
Type bool is not a subtype of type int
# - : <  > -> <  > = <fun>
# - : < .. > -> <  > = <fun>
#