error[E0446]: private type `PrivateRequest` in public interface
 --> tests/ui/private_body.rs:8:1
  |
5 | struct PrivateRequest;
  | --------------------- `PrivateRequest` declared as private
...
8 | #[api]
  | ^^^^^^ can't leak private type
  |
  = note: this error originates in the attribute macro `api` (in Nightly builds, run with -Z macro-backtrace for more info)