error: this unsafe trait should be implemented explicitly
  --> $DIR/deriving-bounds.rs:11:10
   |
LL | #[derive(Send)]
   |          ^^^^

error: this unsafe trait should be implemented explicitly
  --> $DIR/deriving-bounds.rs:15:10
   |
LL | #[derive(Sync)]
   |          ^^^^

error: aborting due to 2 previous errors