ices/93997.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#93997

fn main() {
    while {} {}
}

=== stdout ===
=== stderr ===
error[E0308]: mismatched types
 --> /home/runner/work/glacier/glacier/ices/93997.rs:2:11
  |
2 |     while {} {}
  |           ^^ expected `bool`, found `()`

error: aborting due to previous error

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