Demonstration of property name collision

Protocol Misunderstanding.swift

// Person.swift
struct Person {
    let givenName: String
    let familyName: String
}

// SecretAgent.swift
protocol SecretAgent {
    var givenName: String { get }
}

// Unrelated file
extension Person : SecretAgent {}

// Point of misunderstanding.
func doxxSecretAgent(agent: SecretAgent) {
    print("Secret Agent's given name: \(agent.givenName)")
}

// Hope you didn't want that MI6 agent outed.
let regularPerson = Person(givenName: "Ian", familyName: "Fleming")
doxxSecretAgent(agent: regularPerson)