ices/99820.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#99820

#![feature(const_trait_impl)]
#![feature(fn_traits)]
#![feature(unboxed_closures)]

struct Closure;

impl const FnOnce<&usize> for Closure {
    type Output = usize;

    extern "rust-call" fn call_once(self, arg: &usize) -> Self::Output {
        *arg
    }
}

enum Bug<T = [(); Closure.call_once(&0) ]> {
    V(T),
}

fn main() {}

=== stdout ===
=== stderr ===
error[E0059]: type parameter to bare `FnOnce` trait must be a tuple
 --> /home/runner/work/glacier/glacier/ices/99820.rs:7:12
  |
7 | impl const FnOnce<&usize> for Closure {
  |            ^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `&usize`
  |
note: required by a bound in `FnOnce`

error[E0277]: `&usize` is not a tuple
  --> /home/runner/work/glacier/glacier/ices/99820.rs:15:37
   |
15 | enum Bug<T = [(); Closure.call_once(&0) ]> {
   |                           --------- ^^ the trait `Tuple` is not implemented for `&usize`
   |                           |
   |                           required by a bound introduced by this call
   |
note: required by a bound in `call_once`

error[E0277]: functions with the "rust-call" ABI must take a single non-self tuple argument
  --> /home/runner/work/glacier/glacier/ices/99820.rs:10:5
   |
10 |     extern "rust-call" fn call_once(self, arg: &usize) -> Self::Output {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Tuple` is not implemented for `&usize`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0059, E0277.
For more information about an error, try `rustc --explain E0059`.
==============