#[repr(packed)] pub struct Good { data: &'static u32, data2: [&'static u32; 2], aligned: [u8; 32], } #[repr(packed)] pub struct JustArray { array: [u32] } #[deny(safe_packed_borrows)] fn main() { let good = Good { data: &0, data2: [&0, &0], aligned: [0; 32] }; unsafe { let _ = &good.data; // ok let _ = &good.data2[0]; // ok } let _ = &good.data; //~ ERROR borrow of packed field is unsafe //~| hard error let _ = &good.data2[0]; //~ ERROR borrow of packed field is unsafe //~| hard error let _ = &*good.data; // ok, behind a pointer let _ = &good.aligned; // ok, has align 1 let _ = &good.aligned[2]; // ok, has align 1 }