error: only functions, statics, and consts can define opaque types
  --> $DIR/define-via-extern.rs:6:5
   |
LL |     #[define_opaque(Hi)] fn foo();
   |     ^^^^^^^^^^^^^^^^^^^^

error: only functions, statics, and consts can define opaque types
  --> $DIR/define-via-extern.rs:9:5
   |
LL |     #[define_opaque(Hi)] static HI: Hi;
   |     ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors