ices/68684-1.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#68684

enum Enum {
    A(),
}

impl Enum {
    const fn a() -> Self {
        return Self::A();
    }
}

pub fn main() {
    const A: Enum = Enum::a();
}

=== stdout ===
=== stderr ===
warning: enum is never used: `Enum`
 --> /home/runner/work/glacier/glacier/ices/68684-1.rs:1:6
  |
1 | enum Enum {
  |      ^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: method is never used: `a`
 --> /home/runner/work/glacier/glacier/ices/68684-1.rs:6:5
  |
6 |     const fn a() -> Self {
  |     ^^^^^^^^^^^^^^^^^^^^

warning: constant item is never used: `A`
  --> /home/runner/work/glacier/glacier/ices/68684-1.rs:12:5
   |
12 |     const A: Enum = Enum::a();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

==============