Module Check_accessors (T : T.T2) (Tree : T.T2) (Elt : T.T1) (Cmp : T.T1) (Options : T.T3) (M : Accessors_generic with type ('a, 'b, 'c) options := ('a, 'b, 'c) Options.t with type ('a, 'b) t := ('a, 'b) T.t with type ('a, 'b) tree := ('a, 'b) Tree.t with type 'a elt := 'a Elt.t with type 'cmp cmp := 'cmp Cmp.t)