ices/88434.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#88434

const _CONST: &[u8] = &f(&[], |_| {});

const fn f<F>(_: &[u8], _: F) -> &[u8]
where
    F: FnMut(&u8),
{
    panic!()
}

fn main() {}

=== stdout ===
=== stderr ===
error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
 --> /home/runner/work/glacier/glacier/ices/88434.rs:3:12
  |
3 | const fn f<F>(_: &[u8], _: F) -> &[u8]
  |            ^
  |
  = note: see issue #57563 <https://github.com/rust-lang/rust/issues/57563> for more information
  = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.
==============