error: `belongs_to` must be in the form `belongs_to(...)`
  --> $DIR/belongs_to_invalid_option_syntax.rs:29:3
   |
29 | #[belongs_to]
   |   ^^^^^^^^^^

error: `belongs_to` must be in the form `belongs_to(...)`
  --> $DIR/belongs_to_invalid_option_syntax.rs:30:3
   |
30 | #[belongs_to = "Bar"]
   |   ^^^^^^^^^^^^^^^^^^

error: Expected a struct name
  --> $DIR/belongs_to_invalid_option_syntax.rs:31:3
   |
31 | #[belongs_to()]
   |   ^^^^^^^^^^^^
   |
   = help: e.g. `#[belongs_to(User)]` or `#[belongs_to(parent = "User<'_>")]

error: Expected a struct name
  --> $DIR/belongs_to_invalid_option_syntax.rs:32:3
   |
32 | #[belongs_to(foreign_key = "bar_id")]
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: e.g. `#[belongs_to(User)]` or `#[belongs_to(parent = "User<'_>")]

error: `foreign_key` must be in the form `foreign_key = "value"`
  --> $DIR/belongs_to_invalid_option_syntax.rs:33:19
   |
33 | #[belongs_to(Bar, foreign_key)]
   |                   ^^^^^^^^^^^

warning: The form `foreign_key(value)` is deprecated. Use `foreign_key = "value"` instead
  --> $DIR/belongs_to_invalid_option_syntax.rs:34:19
   |
34 | #[belongs_to(Bar, foreign_key(bar_id))]
   |                   ^^^^^^^^^^^^^^^^^^^

warning: belongs_to takes a single parent. Change
    belongs_to(Baz, random_option)
to
    belongs_to(Baz)
    belongs_to(random_option)
  --> $DIR/belongs_to_invalid_option_syntax.rs:35:3
   |
35 | #[belongs_to(Baz, foreign_key = "bar_id", random_option)]
   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 5 previous errors; 2 warnings emitted