class bs a m =
    let _mode = m and _arch = a in
    let bsh = bs_open _arch _mode in
    object
        method test code addr count =
            let a = 42 in
            match bs with
            | None ->
              let b = 42 in
              printf ":(\n"
            | Some _ ->
              let b = 42 in
              printf "Hello world\n"
    end;;