1 error[E0121]: the placeholder `_` is not allowed within types on item signatures for constants
2 --> $DIR/issue-104768.rs:1:10
4 LL | const A: &_ = 0_u32;
7 | not allowed in type signatures
8 | help: replace with the correct type: `u32`
10 error: aborting due to previous error
12 For more information about this error, try `rustc --explain E0121`.