Implement forced keywords (`k#`) - #161775

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fmease wants to merge 4 commits into

rust-lang:mainfrom

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Commits on Sep 2, 2026

Replace `IdentIsRaw` with `IdentKind`
fmease
committed
ce98c35
Implement forced keywords
fmease
committed
39727e0
Refactor `check_assoc_op`
fmease
committed
edf93d0
Introduce helper `Token::non_raw_ident`
fmease
committed
5065240