ices/81270.rs: fixed with no errors

[github-actions]

Issue: rust-lang/rust#81270

#![feature(allocator_api)]
use std::alloc::{Layout, Allocator, Global, AllocError};
use std::ptr::NonNull;
use std::marker::PhantomData;

struct S<A>{ a: PhantomData<A>, b: [u8; 1] }
unsafe impl<A> Allocator for S<A> {
    fn allocate(&self, _: Layout) -> Result<NonNull<[u8]>, AllocError> {
        todo!();
    }
    unsafe fn deallocate(&self, _: NonNull<u8>, _: Layout) {
        todo!();
    }
}

fn main() {
    let x: Box<u8, S<u8>> = Box::new_in(0, S { a: PhantomData, b: [0; 1] });
}

=== stdout ===
=== stderr ===
warning: unused import: `Global`
 --> /home/runner/work/glacier/glacier/ices/81270.rs:2:37
  |
2 | use std::alloc::{Layout, Allocator, Global, AllocError};
  |                                     ^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused variable: `x`
  --> /home/runner/work/glacier/glacier/ices/81270.rs:17:9
   |
17 |     let x: Box<u8, S<u8>> = Box::new_in(0, S { a: PhantomData, b: [0; 1] });
   |         ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: field is never read: `b`
 --> /home/runner/work/glacier/glacier/ices/81270.rs:6:33
  |
6 | struct S<A>{ a: PhantomData<A>, b: [u8; 1] }
  |                                 ^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: 3 warnings emitted

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