lint `pub const _: ...`

[A4-Tacks]

Code

pub const _: () = {
    // ...
};

Current output

empty

Desired output

warning: ...
 --> src/bin/main.rs:2:14
  |
1 | pub const _: () = {
  | ^^^
  |
  = note: `#[warn(unused_pub)]` on by default
help: remove these parentheses
  |
1 - pub const _: () = {
1 + const _: () = {
  |

Rationale and extra context

No response

Other cases

Rust Version

rustc 1.90.0-nightly (a00149764 2025-07-14)
binary: rustc
commit-hash: a001497644bc229f1abcc5b2528733386591647f
commit-date: 2025-07-14
host: aarch64-unknown-linux-gnu
release: 1.90.0-nightly
LLVM version: 20.1.8

Anything else?

No response