ices/65679.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#65679

=== stdout ===
=== stderr ===
error[E0277]: the trait bound `(): std::future::Future` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/65679.rs:3:1
  |
3 | type Fut = impl std::future::Future;
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::future::Future` is not implemented for `()`
  |
  = note: the return type of a function must have a statically known size

error: aborting due to previous error

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