A declaration cannot be both ‘final’ and ‘dynamic’ error in Swift 1.2

This issue arises because Swift is trying to generate a dynamic accessor for the static property for Obj-C compatibility, since the class inherits from NSObject.

If your project is in Swift only, rather than using a var accessor you can avoid the issue via the @nonobjc attribute in Swift 2.0:

import Foundation

class AAA: NSObject {}
extension AAA {
    @nonobjc static let value = 111

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