error: inherent impls cannot be `default` --> $DIR/validation.rs:7:14 | LL | default impl S {} | ------- ^ inherent impl for this type | | | `default` because of this | = note: only trait implementations may be annotated with `default` error: impls of auto traits cannot be default --> $DIR/validation.rs:9:1 | LL | default unsafe impl Send for S {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: impls of auto traits cannot be default --> $DIR/validation.rs:10:1 | LL | default impl !Send for Z {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ error[E0192]: negative impls are only allowed for auto traits (e.g., `Send` and `Sync`) --> $DIR/validation.rs:13:1 | LL | default impl !Tr for S {} | ^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 4 previous errors For more information about this error, try `rustc --explain E0192`.