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変更内容
Shield
コントラクトが継承しているOwnable
コントラクトの初期化処理が無いため追加した。背景
Section 2 > Lesson 2 にて、
Ownable
のSolidityバージョンが^0.8.20
であったため、コンパイラのバージョンを 19 → 20 にあげた。すると、Ownable
コントラクトが初期化されていないためにコンパイルエラーが出た。下記の通り、Ownable
コントラクトには初期化が必要なコンストラクタがあるため、初期化処理を追加した。備考