protocol P1 {

    func foo1()

    var Ins: Int { get set }

    func foo2(a a: Int, b b: Int)

    subscript(_ a: Int) -> Int { get set }

    func fooConstraint()
}

protocol P2 : P1 {

    func bar1()

    func bar2()
}

extension P2 {

    func foo1()

    var Ins: Int

    func foo2(a a: Int, b b: Int)

    subscript(_ a: Int) -> Int
}

extension P2 {

    func fooConstraint()
}

protocol P3 {

    func p3Required()
}


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