docs: add comprehensive documentation for borrowing from repr(packed)… #1984
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… arrays - Add detailed explanation of alignment requirements when borrowing from packed structs - Document that array/slice ABI alignment equals element type alignment - Provide concrete examples showing allowed and forbidden borrowing patterns - Clarify that E0793 error prevents creation of misaligned references - Explain the conservative nature of alignment checks in generic contexts This documentation helps developers understand the safety constraints when working with packed structs containing arrays of different types.
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Document borrowing rules for
repr(packed)fields (E0793).This documents the behavior implemented in rust-lang/rust#145419:
[T; N]/[T], alignment equals that ofT, independent ofN.Includes examples for the allowed
[u8; N]case and the disallowed[u16; N]case.