error: inherent impls cannot be default
  --> $DIR/validation.rs:17:1
   |
LL | default impl S {} //~ ERROR inherent impls cannot be default
   | ^^^^^^^^^^^^^^^^^
   |
   = note: only trait implementations may be annotated with default

error: impls of auto traits cannot be default
  --> $DIR/validation.rs:19:1
   |
LL | default unsafe impl Send for S {} //~ ERROR impls of auto traits cannot be default
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: impls of auto traits cannot be default
  --> $DIR/validation.rs:20:1
   |
LL | default impl !Send for Z {} //~ ERROR impls of auto traits cannot be default
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0192]: negative impls are only allowed for auto traits (e.g., `Send` and `Sync`)
  --> $DIR/validation.rs:23:1
   |
LL | default impl !Tr for S {} //~ ERROR negative impls are only allowed for auto traits
   | ^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0192`.