ices/69487.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#69487

#![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 ===
warning: the feature `const_trait_impl` is incomplete and may not be safe to use and/or cause compiler crashes
 --> /home/runner/work/glacier/glacier/ices/69487.rs:1:12
  |
1 | #![feature(const_trait_impl)]
  |            ^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(incomplete_features)]` on by default
  = note: see issue #67792 <https://github.com/rust-lang/rust/issues/67792> for more information

error: A function with the "rust-call" ABI must take a single non-self argument that is a tuple
  --> /home/runner/work/glacier/glacier/ices/69487.rs:10:5
   |
10 |     extern "rust-call" fn call_once(self, arg: &usize) -> Self::Output {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error; 1 warning emitted

==============