ices/90847.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#90847

#![feature(generic_const_exprs)]

struct Foo<const A: [(); 0 + 0]>
    where [(); 0 + 0]: Sized;

pub fn main() {}

=== stdout ===
=== stderr ===
warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/90847.rs:1:12
  |
1 | #![feature(generic_const_exprs)]
  |            ^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information

error: `[(); _]` is forbidden as the type of a const generic parameter
 --> /home/runner/work/glacier/glacier/ices/90847.rs:3:21
  |
3 | struct Foo<const A: [(); 0 + 0]>
  |                     ^^^^^^^^^^^
  |
  = note: the only supported types are integers, `bool` and `char`
  = help: more complex types are supported with `#![feature(adt_const_params)]`

error: aborting due to previous error; 1 warning emitted

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

[Alexendoo]

Doesn't ICE with #![feature(adt_const_params)] added either