#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#[repr(packed, C)]
struct Packed {
    _padding: u8,
    unaligned: u32,
}
fn main() {
    let mut packed: Packed = unsafe { std::mem::zeroed() };
    let unaligned = &raw mut packed.unaligned;
    unsafe { std::ptr::write_unaligned(unaligned, 42) };
    assert_eq!({ packed.unaligned }, 42);
}