error: `#[pkg::before_sending]` must be an async function named `before_sending` containing any combination of `api: &mut SomeApi`, `params: &mut SomePackageParams` and `res_params: &mut SomeResponseParams`.
 --> tests/ui/error_enum/bad_before_sending.rs:3:10
  |
3 |   #[pkg::before_sending]
  |          ^^^^^^^^^^^^^^