ices/109298.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#109298

fn arr_by_ref(mut x: [(); 3]) {
    let f = || {
        let [ref y, ref mut z @ ..] = x;
    };
    f();
}

fn main() {}

=== stdout ===
=== stderr ===
warning: unused variable: `y`
 --> /home/runner/work/glacier/glacier/ices/109298.rs:3:18
  |
3 |         let [ref y, ref mut z @ ..] = x;
  |                  ^ help: if this is intentional, prefix it with an underscore: `_y`
  |
  = note: `#[warn(unused_variables)]` on by default

warning: unused variable: `z`
 --> /home/runner/work/glacier/glacier/ices/109298.rs:3:29
  |
3 |         let [ref y, ref mut z @ ..] = x;
  |                             ^ help: if this is intentional, prefix it with an underscore: `_z`

error[E0596]: cannot borrow `f` as mutable, as it is not declared as mutable
 --> /home/runner/work/glacier/glacier/ices/109298.rs:5:5
  |
3 |         let [ref y, ref mut z @ ..] = x;
  |                                       - calling `f` requires mutable binding due to mutable borrow of `x`
4 |     };
5 |     f();
  |     ^ cannot borrow as mutable
  |
help: consider changing this to be mutable
  |
2 |     let mut f = || {
  |         +++

error: aborting due to previous error; 2 warnings emitted

For more information about this error, try `rustc --explain E0596`.
==============