ices/73541.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#73541

fn main() {
    'a: loop {
        async {
            loop {
                continue 'a;
            }
        };
    }
}

=== stdout ===
=== stderr ===
error[E0767]: use of unreachable label `'a`
 --> /home/runner/work/glacier/glacier/ices/73541.rs:5:26
  |
2 |     'a: loop {
  |     -- unreachable label defined here
...
5 |                 continue 'a;
  |                          ^^ unreachable label `'a`
  |
  = note: labels are unreachable through functions, closures, async blocks and modules

warning: unused label
 --> /home/runner/work/glacier/glacier/ices/73541.rs:2:5
  |
2 |     'a: loop {
  |     ^^
  |
  = note: `#[warn(unused_labels)]` on by default

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0767`.
==============