7 genuine passive-voice rewrites (actor named, or the passive
construction replaced with a natural active verb/imperative); 5 false
positives left untouched — a temporal 'when it was written' reference,
two predicate-adjective necessity descriptions ('is needed'/'is
expected', same category as 'is required'), one predicate-adjective
state description ('are gone'), and one quoted literal + predicate
adjective ('these inputs are unused by rust').
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