ices/99642.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#99642

fn test() -> impl Iterator<Item = impl Sized> {
    Box::new(0..) as Box<dyn Iterator<Item = _>>
}

pub fn main() {}

=== stdout ===
=== stderr ===
warning: function `test` is never used
 --> /home/runner/work/glacier/glacier/ices/99642.rs:1:4
  |
1 | fn test() -> impl Iterator<Item = impl Sized> {
  |    ^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: 1 warning emitted

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