extension Optional {
    static func ~=(lhs: Wrapped, rhs: Optional<Wrapped>) -> Bool {
        guard let unwrappedValue = rhs else { return false }
        return lhs ~= unwrappedValue
    }
}

struct Person {
    var name: String
}

var john.  : Person? = Person(name: "John")
var someone: Person  = Person(name: "Someone")

switch john {
case someone :
    print("Someone Named John")
default:
    print("")
}