ices/51892.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#51892

#![feature(specialization)]

pub trait Trait {
  type Type;
}

impl<T: ?Sized> Trait for T {
  default type Type = [u8; 1];
}

impl<T: Trait> Trait for *const T {
  type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
}

=== stdout ===
=== stderr ===
error: generic parameters may not be used in const operations
  --> /home/runner/work/glacier/glacier/ices/51892.rs:12:41
   |
12 |   type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
   |                                         ^ 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

warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/51892.rs:1:12
  |
1 | #![feature(specialization)]
  |            ^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
  = help: consider using `min_specialization` instead, which is more stable and complete

error[E0601]: `main` function not found in crate `51892`
  --> /home/runner/work/glacier/glacier/ices/51892.rs:1:1
   |
1  | / #![feature(specialization)]
2  | |
3  | | pub trait Trait {
4  | |   type Type;
...  |
12 | |   type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
13 | | }
   | |_^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/51892.rs`

error: aborting due to 2 previous errors; 1 warning emitted

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