ices/87340.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#87340

type PartiallyDefined<T> = impl 'static;
fn partially_defined() -> PartiallyDefined<_> {}

=== stdout ===
=== stderr ===
error: at least one trait must be specified
 --> /home/runner/work/glacier/glacier/ices/87340.rs:1:28
  |
1 | type PartiallyDefined<T> = impl 'static;
  |                            ^^^^^^^^^^^^

error[E0658]: `impl Trait` in type aliases is unstable
 --> /home/runner/work/glacier/glacier/ices/87340.rs:1:28
  |
1 | type PartiallyDefined<T> = impl 'static;
  |                            ^^^^^^^^^^^^
  |
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
  = help: add `#![feature(type_alias_impl_trait)]` to the crate attributes to enable

error[E0601]: `main` function not found in crate `87340`
 --> /home/runner/work/glacier/glacier/ices/87340.rs:2:49
  |
2 | fn partially_defined() -> PartiallyDefined<_> {}
  |                                                 ^ consider adding a `main` function to `/home/runner/work/glacier/glacier/ices/87340.rs`

error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
 --> /home/runner/work/glacier/glacier/ices/87340.rs:2:44
  |
2 | fn partially_defined() -> PartiallyDefined<_> {}
  |                                            ^ not allowed in type signatures

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0121, E0601, E0658.
For more information about an error, try `rustc --explain E0121`.
==============