Spell out repr(packed) structs

Co-authored-by: Kevin Reid <[email protected]>

Author: cuviper

posts/2024-10-17-Rust-1.82.0.md

@@ -95,7 +95,7 @@ With the semantics for NaN values settled, this release also permits the use of
 
 ### Native syntax for creating a raw pointer
 
-Unsafe code sometimes has to deal with pointers that may dangle, may be misaligned, or may not point to valid data. A common case where this comes up are packed structs. In such a case, it is important to avoid creating a reference, as that would cause undefined behavior. This means the usual `&` and `&mut` operators cannot be used, as those create a reference -- even if the reference is immediately cast to a raw pointer, it's too late to avoid the undefined behavior.
+Unsafe code sometimes has to deal with pointers that may dangle, may be misaligned, or may not point to valid data. A common case where this comes up are `repr(packed)` structs. In such a case, it is important to avoid creating a reference, as that would cause undefined behavior. This means the usual `&` and `&mut` operators cannot be used, as those create a reference -- even if the reference is immediately cast to a raw pointer, it's too late to avoid the undefined behavior.
 
 For several years, the macros `std::ptr::addr_of!` and `std::ptr::addr_of_mut!` have served this purpose. Now the time has come to provide a proper native syntax for this operation: `addr_of!(expr)` becomes `&raw const expr`, and `addr_of_mut!(expr)` becomes `&raw mut expr`. For example: