error: Unexpected type of meta argument: unknown-attribute

       ... expected 'attr', 'attr = value', 'attr(arg)', 'attr(arg) = value'
 --> tests/errors/dtor_bad.rs:4:1
  |
4 | #[dtor(unknown-attribute)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: this error originates in the macro `$crate::__extract_meta` which comes from the expansion of the attribute macro `dtor` (in Nightly builds, run with -Z macro-backtrace for more info)
