#![allow(unused_variables)]
#![feature(allocator_api, box_vec_non_null, slice_ptr_get)]
fn main() {
    fn _inner() -> core::result::Result<(), impl core::fmt::Debug> {
        use std::alloc::{Allocator, Layout, System};
        unsafe {
            let non_null = System.allocate(Layout::new::<i32>())?.cast::<i32>();
            non_null.write(5);
            let x = Box::from_non_null_in(non_null, System);
        }
        Ok::<(), std::alloc::AllocError>(())
    }
    _inner().unwrap()
}