private class PipeSkipTail[E]
	super Iterator[E]

	var source: Iterator[E]

	var length: Int

	var lasts = new List[E]

	init
	do
		var lasts = self.lasts
		while source.is_ok and lasts.length < length do
			lasts.push(source.item)
			source.next
		end
	end

	redef fun is_ok do return source.is_ok

	redef fun item do return lasts.first

	redef fun next
	do
		lasts.shift
		lasts.push(source.item)
		source.next
	end
end