error: reference to packed field is unaligned
  --> $DIR/unaligned_references_external_macro.rs:5:1
   |
LL | / unaligned_references_external_crate::mac! {
LL | |
LL | |     #[repr(packed)]
LL | |     pub struct X {
LL | |         pub field: u16
LL | |     }
LL | | }
   | |_^
   |
   = 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)
   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
note: the lint level is defined here
  --> $DIR/unaligned_references_external_macro.rs:5:1
   |
LL | / unaligned_references_external_crate::mac! {
LL | |
LL | |     #[repr(packed)]
LL | |     pub struct X {
LL | |         pub field: u16
LL | |     }
LL | | }
   | |_^
   = note: this error originates in the macro `unaligned_references_external_crate::mac` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to previous error

Future incompatibility report: Future breakage diagnostic:
error: reference to packed field is unaligned
  --> $DIR/unaligned_references_external_macro.rs:5:1
   |
LL | / unaligned_references_external_crate::mac! {
LL | |
LL | |     #[repr(packed)]
LL | |     pub struct X {
LL | |         pub field: u16
LL | |     }
LL | | }
   | |_^
   |
   = 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)
   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
note: the lint level is defined here
  --> $DIR/unaligned_references_external_macro.rs:5:1
   |
LL | / unaligned_references_external_crate::mac! {
LL | |
LL | |     #[repr(packed)]
LL | |     pub struct X {
LL | |         pub field: u16
LL | |     }
LL | | }
   | |_^
   = note: this error originates in the macro `unaligned_references_external_crate::mac` (in Nightly builds, run with -Z macro-backtrace for more info)