error: malformed `marker` attribute input --> $DIR/marker-attribute-with-values.rs:3:1 | LL | #[marker(always)] | ^^^^^^^^^^^^^^^^^ help: must be of the form: `#[marker]` error: malformed `marker` attribute input --> $DIR/marker-attribute-with-values.rs:6:1 | LL | #[marker("never")] | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[marker]` error: malformed `marker` attribute input --> $DIR/marker-attribute-with-values.rs:9:1 | LL | #[marker(key = "value")] | ^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[marker]` error: aborting due to 3 previous errors