error: invalid spec attribute; use #[spec("file.spec.md")]
 --> tests/ui/fail_legacy_named_argument.rs:3:1
  |
3 | #[spec(path = "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)