warning: reference to packed field is unaligned
  --> $DIR/repr_packed.rs:24:24
   |
LL |         println!("{}", foo.x);
   |                        ^^^^^
   |
   = note: `#[warn(unaligned_references)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523>
   = note: fields of packed structs are not properly aligned, and creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)

warning: 1 warning emitted

