ices/101297.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#101297

fn ice() -> impl AsRef<Fn(&())> {
    todo!()
}

pub fn main() {}

=== stdout ===
=== stderr ===
warning: trait objects without an explicit `dyn` are deprecated
 --> /home/runner/work/glacier/glacier/ices/101297.rs:1:24
  |
1 | fn ice() -> impl AsRef<Fn(&())> {
  |                        ^^^^^^^
  |
  = note: `#[warn(bare_trait_objects)]` on by default
  = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
  = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
help: use `dyn`
  |
1 - fn ice() -> impl AsRef<Fn(&())> {
1 + fn ice() -> impl AsRef<dyn Fn(&())> {
  |

error[E0277]: the trait bound `(): AsRef<(dyn for<'r> Fn(&'r ()) + 'static)>` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/101297.rs:1:13
  |
1 | fn ice() -> impl AsRef<Fn(&())> {
  |             ^^^^^^^^^^^^^^^^^^^ the trait `AsRef<(dyn for<'r> Fn(&'r ()) + 'static)>` is not implemented for `()`

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0277`.
==============