ices/75889.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#75889

const /* or static */ FOO: dyn Fn() /* or just fn() */ -> _ = "this can be anything";

fn main() {}

=== stdout ===
=== stderr ===
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
 --> /home/runner/work/glacier/glacier/ices/75889.rs:1:59
  |
1 | const /* or static */ FOO: dyn Fn() /* or just fn() */ -> _ = "this can be anything";
  |                                                           ^ 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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