ices/84408.rs: fixed with errors (#729)

=== stdout ===
=== stderr ===
error[E0601]: `main` function not found in crate `84408`
  --> /home/runner/work/glacier/glacier/ices/84408.rs:1:1
   |
1  | / #![feature(const_generics, const_evaluatable_checked)]
2  | | #![allow(incomplete_features)]
3  | |
4  | | trait Melon<const X: usize> {
...  |
30 | |     }
31 | | }
   | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/84408.rs`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0601`.
==============

Co-authored-by: rustbot <rustbot@users.noreply.github.com>