tests/ui/packed/auxiliary/packed.rs

#[repr(packed)]
pub struct P1S5 {
    a: u8,
    b: u32
}

#[repr(packed(2))]
pub struct P2S6 {
    a: u8,
    b: u32,
    c: u8
}

#[repr(C, packed(2))]
pub struct P2CS8 {
    a: u8,
    b: u32,
    c: u8
}