message: [ocaml-gen] fixing trait usage
diff: @@ -515,7 +515,7 @@ pub fn derive_ocaml_gen(item: TokenStream) -> TokenStream {
  let mut missing_types: Vec<String> = vec![];
  #(
  - missing_types.push(&<#fields_to_call>::ocaml_desc(env, &global_generics));
  + missing_types.push(<#fields_to_call as ::ocaml_gen::OCamlDesc>::ocaml_desc(env, &global_generics));
  );*
  for ty in punctured_generics {
  