protocol One { var string1: String { get } }
extension One { var string1: String { return "string1" } }

protocol Two { var string2: String { get } }
extension Two { var string2: String { return "string2" } }

protocol Three { var string3: String { get } }
extension Three { var string3: String { return "string3" } }

typealias OneAndTwo = One & Two
typealias AllThree = One & Two & Three

class Stringy: One & Two {}
class Stringier: One & Two & Three {}

var firstTwo: OneAndTwo.Type = Stringy.self // Works fine
var allThree: AllThree.Type = Stringier.self // Crashes