ices/63279.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#63279

=== stdout ===
=== stderr ===
error[E0271]: type mismatch resolving `<[closure@/home/runner/work/glacier/glacier/ices/63279.rs:6:5: 6:28] as std::ops::FnOnce<()>>::Output == ()`
 --> /home/runner/work/glacier/glacier/ices/63279.rs:3:1
  |
3 | type Closure = impl FnOnce();
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected opaque type, found ()
  |
  = note: expected type `Closure`
             found type `()`
  = 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 E0271`.
==============

[JohnTitor]

The original issue hasn't been closed but the ICE doesn't appear anymore.