struct A { let i: Int } struct B { let a: A? = nil } //let _: [Any] = [B()].compactMap { $0[keyPath: \B.a?.i] } // OK let _: [Any] = [B()].compactMap(\.a?.i)struct A { let i: Int } struct B { let a: A? = nil } //let _: [Any] = [B()].compactMap { $0[keyPath: \B.a?.i] } // OK let _: [Any] = [B()].compactMap(\.a?.i)