Module Check_creators (T : T.T3) (Tree : T.T3) (Key : T.T1) (Options : T.T3) (M : Creators_generic with type ('a, 'b, 'c) options := ('a, 'b, 'c) Options.t with type ('a, 'b, 'c) t := ('a, 'b, 'c) T.t with type ('a, 'b, 'c) tree := ('a, 'b, 'c) Tree.t with type 'a key := 'a Key.t)