This may turn out to be limited to Windows 7 Arduino 1.x users, and there probably aren't many of them, but I'm so far not able to use 4.0.0 after updating via the Boards manager, in Arduino 1.8.19, ...
Arduino: 1.8.5 (Windows 10), Board: "Arduino/Genuino Uno" In file included from C:\Users\SlashemfilmproFX6300\AppData\Local\Temp\Rar$DIa12184.24968\ANALOG_EBRAKE ...
一部の結果でアクセス不可の可能性があるため、非表示になっています。
アクセス不可の結果を表示する