sekret protocol requirements!

sneaky

class FooColl : Swift.Collection {
    /* Secret protocol conformance requirements! Apparently Collection 
       inherits from a "_Collection" protocol that has more stuff.

    error: type 'FooColl' does not conform to protocol '_Collection'
    class FooColl : Swift.Collection {
    ^

    Swift._Collection:3:19: note: protocol requires property 'startIndex' with type 'FooColl.IndexType'
    /*@public*/ var startIndex: IndexType { get }
                    ^

    Swift._Collection:4:19: note: protocol requires property 'endIndex' with type 'FooColl.IndexType'
    /*@public*/ var endIndex: IndexType { get }
                    ^
    */

//    var startIndex : Int { get { return 2 } }
//    var endIndex : Int { get { return 9 } }
    


    func generate() -> GeneratorOf<Int> {
        var i = 2
        return GeneratorOf<Int> {
            if i < 10 {
                return i
            } else {
                return nil
            }
        }
    }
    
    subscript (i: Int) -> Int {
        get{
            return 0
        }
    }
}