#![allow(unused_variables)]
#![feature(allocator_api)]
fn main() {
    use std::sync::Arc;
    use std::alloc::System;
    let values = Arc::<[u32], _>::new_zeroed_slice_in(3, System);
    let values = unsafe { values.assume_init() };
    assert_eq!(* values, [0, 0, 0])
}