Generic where type is constrained by class and protocol

gistfile1.swift

protocol MyProtocol {
    func methodFromProtocol()
}

class MyClass {
    func methodFromClass() {
        println("hello class")
    }
}

class MyClassImplementingMyProtocol : MyClass, MyProtocol {
    func methodFromProtocol() {
        println("hello protocol")
    }
}

func doThing<T: MyClass where T: MyProtocol>(myThing: T) {
    myThing.methodFromProtocol()
    myThing.methodFromClass()
}

doThing(MyClassImplementingMyProtocol())