indexOfSlice

trait Collection[A] {
  def indexOfSlice(as: Collection[A]): Int
  def indexOfSlice(as: Collection[A], j: Int): Int
}

indexOfSlice returns the index of the first element where the collection as can be found as a slice.

The search can start at the given offset j.

If as cannot be found as a slice in this collection then this function returns -1.