message: Derive ocaml things for FeatureFlag
diff: @@ -435,6 +435,10 @@ impl Op2 {
  /// The feature flags that can be used to enable or disable parts of constraints.
  #[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
  +#[cfg_attr(
  + feature = "ocaml_types",
  + derive(ocaml::IntoValue, ocaml::FromValue, ocaml_gen::Enum)
  +)]
  pub enum FeatureFlag {
  ChaCha,
  RangeCheck,
  