error: `#[spec]` may only be applied to a module
 --> tests/ui/fail_non_module_item.rs:3:1
  |
3 | #[spec("flight_core_contract.spec.md")]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: this error originates in the attribute macro `spec` (in Nightly builds, run with -Z macro-backtrace for more info)