ices/77179.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#77179

#![feature(type_alias_impl_trait)]

type Pointer<T> = impl std::ops::Deref<Target=T>;

fn test() -> Pointer<_> {
    Box::new(1)
}

fn main() {
    test();
}

=== stdout ===
=== stderr ===
error[E0658]: `impl Trait` in type aliases is unstable
 --> /home/runner/work/glacier/glacier/ices/77179.rs:3:19
  |
3 | type Pointer<T> = impl std::ops::Deref<Target=T>;
  |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
  = help: add `#![feature(min_type_alias_impl_trait)]` to the crate attributes to enable

warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/77179.rs:1:12
  |
1 | #![feature(type_alias_impl_trait)]
  |            ^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information

error[E0121]: the type placeholder `_` is not allowed within types on item signatures for return types
 --> /home/runner/work/glacier/glacier/ices/77179.rs:5:22
  |
5 | fn test() -> Pointer<_> {
  |              --------^-
  |              |       |
  |              |       not allowed in type signatures
  |              help: replace with the correct return type: `Box<i32>`

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

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

[Alexendoo]

27c2c52