ices/66580.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#66580

#![feature(type_alias_impl_trait)]

type Closure = impl FnOnce();

fn closure() -> Closure {
    || {}
}

struct Wrap<T> { f: T }

impl Wrap<Closure> {}

impl<T> Wrap<T> {}

fn main() {}

=== stdout ===
=== stderr ===
warning: function is never used: `closure`
 --> /home/runner/work/glacier/glacier/ices/66580.rs:5:4
  |
5 | fn closure() -> Closure {
  |    ^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: struct is never constructed: `Wrap`
 --> /home/runner/work/glacier/glacier/ices/66580.rs:9:8
  |
9 | struct Wrap<T> { f: T }
  |        ^^^^

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