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Ruby 3.0.0 から番号指定パラメータ(Numbered parameter)は変数名、メソッド名として使用できなくなりました。
ほかの予約語と異なり def キーワードでメソッド定義できないため、別段落で説明を書きました。
fix: #2456
ref : #2458
プロと読み解く Ruby 3.0 NEWS - クックパッド開発者ブログ