#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ptr;
#[repr(packed)]
struct Packed {
    f1: u8,
    f2: u16,
}
fn main() {
    let mut packed = Packed { f1: 1, f2: 2 };
    let raw_f2 = ptr::addr_of_mut!(packed.f2);
    unsafe {
        raw_f2.write_unaligned(42);
    }
    assert_eq!({ packed.f2 }, 42);
}