ices/62708.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#62708

pub struct MultiDriver<D: ?Sized> {
    d: [std::marker::PhantomData<D>; MultiDriver::<D>::MAX_DRIVERS],
}

impl<D: ?Sized> MultiDriver<D> {
    const MAX_DRIVERS: usize = 10;
}

=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
 --> /home/runner/work/glacier/glacier/ices/62708.rs:2:52
  |
2 |     d: [std::marker::PhantomData<D>; MultiDriver::<D>::MAX_DRIVERS],
  |                                                    ^ cannot perform const operation using `D`
  |
  = 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 `62708`
 --> /home/runner/work/glacier/glacier/ices/62708.rs:1:1
  |
1 | / pub struct MultiDriver<D: ?Sized> {
2 | |     d: [std::marker::PhantomData<D>; MultiDriver::<D>::MAX_DRIVERS],
3 | | }
4 | |
5 | | impl<D: ?Sized> MultiDriver<D> {
6 | |     const MAX_DRIVERS: usize = 10;
7 | | }
  | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/62708.rs`

error: aborting due to 2 previous errors

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