Camlidl generates the following mli (sample here)

type union_9 =
  | NUMERIC
  | STRING
  | TBOOL
  | ENUM_DATA
  | CONTROL
  | ENCRYPT
and msg_type = union_9

let foo x : msg_type option = x



If I try to do

# foo STRING;;
Characters 4-10:
  foo STRING;;
      ^^^^^^
This expression has type union_9 but is here used with type msg_type option


How can I either get camlidl to not do this, or what is the syntax in Ocaml
to ensure I use the right type?

Thanks,

Ronnie

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