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error[E0793]: reference to packed field is unaligned
--> $DIR/unaligned_references_external_macro.rs:5:1
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LL | / unaligned_references_external_crate::mac! {
LL | | #[repr(packed)]
LL | | pub struct X {
LL | | pub field: u16
LL | | }
LL | | }
| |_^
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= note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
= note: 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: 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
For more information about this error, try `rustc --explain E0793`.
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