mirror of https://github.com/rust-lang/rust
20 lines
1001 B
Plaintext
20 lines
1001 B
Plaintext
error[E0793]: reference to packed field is unaligned
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--> $DIR/unaligned_references_external_macro.rs:5:1
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LL | / unaligned_references_external_crate::mac! {
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LL | | #[repr(packed)]
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LL | | pub struct X {
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LL | | pub field: u16
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LL | | }
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LL | | }
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| |_^
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= note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
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= note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
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= 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)
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= note: this error originates in the macro `unaligned_references_external_crate::mac` (in Nightly builds, run with -Z macro-backtrace for more info)
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0793`.
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