ices/74282.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#74282

#![feature(type_alias_impl_trait)]

type Closure = impl Fn() -> u64;
struct Anonymous(Closure);

fn test() {
    let y = || -> Closure { || 3 };
    Anonymous(|| 3)
}

fn main() {}

=== stdout ===
=== stderr ===
error[E0308]: mismatched types
 --> /home/runner/work/glacier/glacier/ices/74282.rs:8:15
  |
3 | type Closure = impl Fn() -> u64;
  |                ---------------- the expected opaque type
...
8 |     Anonymous(|| 3)
  |               ^^^^ expected closure, found a different closure
  |
  = note: expected opaque type `Closure`
                 found closure `[closure@/home/runner/work/glacier/glacier/ices/74282.rs:8:15: 8:19]`
  = note: no two closures, even if identical, have the same type
  = help: consider boxing your closure and/or using it as a trait object

error[E0308]: mismatched types
 --> /home/runner/work/glacier/glacier/ices/74282.rs:8:5
  |
8 |     Anonymous(|| 3)
  |     ^^^^^^^^^^^^^^^ expected `()`, found struct `Anonymous`
  |
help: consider using a semicolon here
  |
8 |     Anonymous(|| 3);
  |                    +
help: try adding a return type
  |
6 | fn test() -> Anonymous {
  |           ++++++++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
==============