ices/43408.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#43408

#![feature(const_fn)]
pub const fn sof<T:?Sized>() -> usize {
    10
}
fn to_byte_array<T>() -> [u8; sof::<T>()] {
     panic!()
}

=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
 --> /home/runner/work/glacier/glacier/ices/43408.rs:5:37
  |
5 | fn to_byte_array<T>() -> [u8; sof::<T>()] {
  |                                     ^ cannot perform const operation using `T`
  |
  = note: type parameters may not be used in const expressions
  = help: use `#![feature(const_generics)]` and `#![feature(const_evaluatable_checked)]` to allow generic const expressions

error[E0601]: `main` function not found in crate `43408`
 --> /home/runner/work/glacier/glacier/ices/43408.rs:1:1
  |
1 | / #![feature(const_fn)]
2 | | pub const fn sof<T:?Sized>() -> usize {
3 | |     10
4 | | }
5 | | fn to_byte_array<T>() -> [u8; sof::<T>()] {
6 | |      panic!()
7 | | }
  | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/43408.rs`

error: aborting due to 2 previous errors

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