> I thought this was it, but none of the default implementations of 
> RangeReplaceableCollection seem to use this empty initialiser
I haven't worked with RangeReplaceableCollection yet, but I wasn't speaking of 
how the protocol is used in the libraries, but by "regular users":

class Factory<T: RangeReplaceableCollectionType> {
        func create() -> T{
                return T()
        }
}

Doing something like this can become really hard when you need parameters.
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