error: cannot find attribute `safe` in this scope
  --> $DIR/safe-proc-macro-attribute.rs:18:3
   |
LL | #[safe(no_mangle)]
   |   ^^^^

error: cannot find attribute `safe` in this scope
  --> $DIR/safe-proc-macro-attribute.rs:14:3
   |
LL | #[safe]
   |   ^^^^

error: aborting due to 2 previous errors