Swift generics and multiple protocols setup

gistfile1.swift

//Given
protocol ProtocolA {
    static var foo : String { get }
}
protocol ProtocolB {
    static var bar : String { get }
}
//I want a function that will only accept types that impliment both protocols
class TypeA : ProtocolA, ProtocolB {
    static var foo : String { get{ return "foo"} }
    static var bar : String { get{ return "bar" } }
}

//Use where clause
func doStuff<T where T : ProtocolA, T : ProtocolB>(arg: T) {
    // do stuff
}
// or Protocol Composition Type  
func doStuff<T : protocol<ProtocolA, ProtocolB>>(arg: T) {
    // do stuff
}