error: item uses `packed` representation without ABI-qualification
  --> tests/ui/repr_packed_without_abi.rs:4:1
   |
LL |   #[repr(packed)]
   |          ------ `packed` representation set here
LL | / struct NetworkPacketHeader {
LL | |
LL | |     header_length: u8,
LL | |     header_version: u16,
LL | | }
   | |_^
   |
   = warning: unqualified `#[repr(packed)]` defaults to `#[repr(Rust, packed)]`, which has no stable ABI
   = help: qualify the desired ABI explicitly via `#[repr(C, packed)]` or `#[repr(Rust, packed)]`
note: the lint level is defined here
  --> tests/ui/repr_packed_without_abi.rs:1:9
   |
LL | #![deny(clippy::repr_packed_without_abi)]
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: item uses `packed` representation without ABI-qualification
  --> tests/ui/repr_packed_without_abi.rs:11:1
   |
LL |   #[repr(packed)]
   |          ------ `packed` representation set here
LL | / union Foo {
LL | |
LL | |     a: u8,
LL | |     b: u16,
LL | | }
   | |_^
   |
   = warning: unqualified `#[repr(packed)]` defaults to `#[repr(Rust, packed)]`, which has no stable ABI
   = help: qualify the desired ABI explicitly via `#[repr(C, packed)]` or `#[repr(Rust, packed)]`

error: aborting due to 2 previous errors