"ocaml_beginners"::[] how to create a closure?

> let get_array =
> let a = None in
^^^^^^^^^^^^^^ try: let a = ref None in
> let get_array () =
> match a with
> None -> (a:= Some (Array.make 10 0);
> !a)
> | Some a -> !a in
> get_array;;
> Characters 88-89:
> None -> (a:= Some (Array.make 10 0);

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