error: unsafe attribute used without unsafe
  --> $DIR/unsafe-attr-edition-span.rs:21:3
   |
LL | #[no_mangle]
   |   ^^^^^^^^^ usage of unsafe attribute
   |
help: wrap the attribute in `unsafe(...)`
   |
LL | #[unsafe(no_mangle)]
   |   +++++++         +

error: unsafe attribute used without unsafe
  --> $DIR/unsafe-attr-edition-span.rs:25:7
   |
LL |     #[no_mangle]
   |       ^^^^^^^^^ usage of unsafe attribute
   |
help: wrap the attribute in `unsafe(...)`
   |
LL |     #[unsafe(no_mangle)]
   |       +++++++         +

error: aborting due to 2 previous errors