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struct KeyModifierFlags: OptionSet { let rawValue: UInt64 static let capsLock = KeyModifierFlags(rawValue: 1 << 0) static let shift = KeyModifierFlags(rawValue: 1 << 1) static let control = KeyModifierFlags(rawValue: 1 << 2) static let option = KeyModifierFlags(rawValue: 1 << 3) static let command = KeyModifierFlags(rawValue: 1 << 4) static let function = KeyModifierFlags(rawValue: 1 << 5) }