ices/68060.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#68060

fn main() {
    (0..)
        .map(
            #[target_feature(enable = "")]
            |_| (),
        )
        .next();
}

=== stdout ===
=== stderr ===
error: `#[target_feature(..)]` can only be applied to `unsafe` functions
 --> /home/runner/work/glacier/glacier/ices/68060.rs:4:13
  |
4 |             #[target_feature(enable = "")]
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can only be applied to `unsafe` functions
5 |             |_| (),
  |             ------ not an `unsafe` function

error: the feature named `` is not valid for this target
 --> /home/runner/work/glacier/glacier/ices/68060.rs:4:30
  |
4 |             #[target_feature(enable = "")]
  |                              ^^^^^^^^^^^ `` is not valid for this target

error: aborting due to 2 previous errors

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