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Allow `&raw [mut | const]` for union field in safe code fixes rust-lang/rust#141264 r? ``@Veykril`` Unresolved questions: - [x] Any edge cases? - [x] How this works with rust-analyzer (because all I've did is prevent compiler from emitting error in `&raw` context) (rust-lang/rust-analyzer#19867) - [x] Should we allow `addr_of!` and `addr_of_mut!` as well? In current version they both (`&raw` and `addr_of!`) are allowed (They are the same) - [x] Is chain of union fields is a safe? (Yes)