ices/66706.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#66706

fn bug() {
    [0; [|f @ &ref _| {} ; 0 ].len() ];
}

fn main() {}

=== stdout ===
=== stderr ===
error: expected identifier, found reserved identifier `_`
 --> /home/runner/work/glacier/glacier/ices/66706.rs:2:20
  |
2 |     [0; [|f @ &ref _| {} ; 0 ].len() ];
  |                    ^ expected identifier, found reserved identifier

error: aborting due to previous error

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