ices/68684-1.rs: fixed with no errors (#291)

=== 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();
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^

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

Co-authored-by: rustbot <[email protected]>

Author: github-actions[bot]