error[E0121]: the placeholder `_` is not allowed within types on item signatures for functions
  --> $DIR/issue-74086.rs:2:20
   |
LL |     static BUG: fn(_) -> u8 = |_| 8;
   |                    ^ not allowed in type signatures

error[E0121]: the placeholder `_` is not allowed within types on item signatures for static items
  --> $DIR/issue-74086.rs:2:20
   |
LL |     static BUG: fn(_) -> u8 = |_| 8;
   |                    ^ not allowed in type signatures

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0121`.