ices/83691.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#83691

mod dep1 {
    extern "C" {
        pub static collision: Box<_>;
    }
}
fn main() {
    dep1::collision
}

=== stdout ===
=== stderr ===
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
 --> /home/runner/work/glacier/glacier/ices/83691.rs:3:35
  |
3 |         pub static collision: Box<_>;
  |                                   ^ not allowed in type signatures

error: aborting due to previous error

For more information about this error, try `rustc --explain E0121`.
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