error: Unknown config.
 --> tests/compile_fail/config/unknown_config.rs:8:7
  |
8 |     #[unknown = "", another_unknown = ""]
  |       ^^^^^^^

error: Unknown config.
 --> tests/compile_fail/config/unknown_config.rs:8:21
  |
8 |     #[unknown = "", another_unknown = ""]
  |                     ^^^^^^^^^^^^^^^

error: Unknown config.
 --> tests/compile_fail/config/unknown_config.rs:9:7
  |
9 |     #[unknown2]
  |       ^^^^^^^^