error[E0308]: mismatched types
  --> $DIR/issue-104768.rs:1:15
   |
LL | const A: &_ = 0_u32;
   |               ^^^^^ expected `&_`, found `u32`
   |
   = note: expected reference `&'static _`
                   found type `u32`
help: consider borrowing here
   |
LL | const A: &_ = &0_u32;
   |               +

error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
  --> $DIR/issue-104768.rs:1:11
   |
LL | const A: &_ = 0_u32;
   |           ^ not allowed in type signatures
   |
help: replace this with a fully-specified type
   |
LL - const A: &_ = 0_u32;
LL + const A: u32 = 0_u32;
   |

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0121, E0308.
For more information about an error, try `rustc --explain E0121`.