message: [ocaml-gen] fix tupple binding generation
diff: @@ -123,7 +123,7 @@ where
  {
  fn ocaml_desc(env: &Env, generics: &[&str]) -> String {
  let v = vec![T1::ocaml_desc(env, generics), T2::ocaml_desc(env, generics)];
  - v.join(" * ")
  + format!("({})", v.join(" * "))
  }
  fn unique_id() -> u128 {
  @@ -184,7 +184,7 @@ where
  T14::ocaml_desc(env, generics),
  T15::ocaml_desc(env, generics),
  ];
  - v.join(" * ")
  + format!("({})", v.join(" * "))
  }
  fn unique_id() -> u128 {
  @@ -210,7 +210,7 @@ where
  T5::ocaml_desc(env, generics),
  T6::ocaml_desc(env, generics),
  ];
  - v.join(" * ")
  + format!("({})", v.join(" * "))
  }
  fn unique_id() -> u128 {
  