in server/src/main/scala/com/twitter/server/view/IndexView.scala [28:33]
def compare(a: Entry, b: Entry): Int = (a, b) match {
case (Link(_, _, _), Group(_, _)) => -1
case (Group(_, _), Link(_, _, _)) => 1
case (Link(id1, _, _), Link(id2, _, _)) => id1 compare id2
case (Group(id1, _), Group(id2, _)) => id1 compare id2
}