ices/67552.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#67552

fn main() {
    rec(Empty);
}

struct Empty;

impl Iterator for Empty {
    type Item = ();
    fn next<'a>(&'a mut self) -> core::option::Option<()> {
        None
    }
}

fn identity<T>(x: T) -> T {
    x
}

fn rec<T>(mut it: T)
where
    T: Iterator,
{
    if () == () {
        T::count(it);
    } else {
        rec(identity(&mut it))
    }
}

=== stdout ===
=== stderr ===
error: reached the recursion limit while instantiating `rec::<&mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut &mut Empty>`
  --> /home/runner/work/glacier/glacier/ices/67552.rs:18:1
   |
18 | / fn rec<T>(mut it: T)
19 | | where
20 | |     T: Iterator,
21 | | {
...  |
26 | |     }
27 | | }
   | |_^

error: aborting due to previous error

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