Terse diagnostic for an associated function shadowed by a variant

[WaffleLapkin]

Code

enum E {
   V(),
}

impl E {
    #[expect(non_snake_case)]
    fn V() {}
}

fn main() {
    let _: E = E::V();
}

Current output

warning: associated function `V` is never used
 --> src/main.rs:7:8
  |
5 | impl E {
  | ------ associated function in this implementation
6 |     #[expect(non_snake_case)]
7 |     fn V() {}
  |        ^
  |
  = note: `#[warn(dead_code)]` on by default

Desired output

warning: associated function `V` is never used
 --> src/main.rs:7:8
  |
5 | impl E {
  | ------ associated function in this implementation
6 |     #[expect(non_snake_case)]
7 |     fn V() {}
  |        ^
  |
  = note: `#[warn(dead_code)]` on by default
  = note: this function is shadowed by the `E::V` variant and can't be called

Rationale and extra context

Tuple variants always shadow methods. If a method has the same name as a variant it is uncallable.

Rust Version

1.87.0