ices/71659.rs: fixed with errors

=== stdout ===
=== stderr ===
error[E0277]: the trait bound `dyn Foo: CastTo<[i32]>` is not satisfied
  --> /home/runner/work/glacier/glacier/ices/71659.rs:30:15
   |
30 |     let x = x.cast::<[i32]>();
   |               ^^^^ the trait `CastTo<[i32]>` is not implemented for `dyn Foo`

error: aborting due to previous error

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

Author: rustbot