ices/96847.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#96847

fn main() {
    for _ in [] {
        #![doc=""]
    }
}

=== stdout ===
=== stderr ===
warning: unused doc comment
 --> /home/runner/work/glacier/glacier/ices/96847.rs:3:9
  |
2 | /     for _ in [] {
3 | |         #![doc=""]
  | |         ^^^^^^^^^^
4 | |     }
  | |_____- rustdoc does not generate documentation for expressions
  |
  = note: `#[warn(unused_doc_comments)]` on by default
  = help: use `//` for a plain comment

error[E0282]: type annotations needed
 --> /home/runner/work/glacier/glacier/ices/96847.rs:2:14
  |
2 |     for _ in [] {
  |              ^^ cannot infer type

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0282`.
==============