Make 🦀 -> `ferris` error suggest uppercase name in `static` or `const` declarations

[Ved-s]

Code

const 🦀: u32 = 5;

mod t {
    static 🦀: u32 = 5;
}

Current output

error: Ferris cannot be used as an identifier
 --> <source>:1:7
  |
1 | const 🦀: u32 = 5;
  |       ^^ help: try using their name instead: `ferris`
...
4 |     static 🦀: u32 = 5;
  |            ^^

Desired output

error: Ferris cannot be used as an identifier
 --> <source>:1:7
  |
1 | const 🦀: u32 = 5;
  |       ^^ help: try using their name instead: `FERRIS`
...
4 |     static 🦀: u32 = 5;
  |            ^^

Rationale and extra context

No response

Other cases

No response

Rust Version

rustc 1.76.0-nightly (eeff92ad3 2023-12-13)
binary: rustc
commit-hash: eeff92ad32c2627876112ccfe812e19d38494087
commit-date: 2023-12-13
host: x86_64-unknown-linux-gnu
release: 1.76.0-nightly
LLVM version: 17.0.5

Anything else?

No response

[chenyukang]

it just a easter-egg, maybe we don't need to put effort into improving it. 😂
there are some other issues....
#91476 (comment)

[oli-obk]

While I think we'd accept a PR if the change is trivial, I don't think we need to track this in an issue

Good find tho 🦀