Testing GitHub's embeded gist

	#!/usr/bin/env ruby
	require 'fiber'
	require 'benchmark'
	DEBUG=false
	class FiberRing
	attr_reader :id
	def initialize(id)
	@id = id
	DEBUG and puts "Creating ring #{@id}"
	@fiber = Fiber.new do
	pass_msg
	end
	end
	def |(nxt)
	DEBUG and puts "attaching #{@id} to #{nxt.id}"
	@next = nxt
	nxt
	end
	def resume
	@fiber.resume
	end
	def pass_msg
	DEBUG and puts "#{@id} pass_msg called"
	while msg = msg_in
	DEBUG and puts "#{@id} received \"#{msg}\""
	msg_out msg
	end
	end
	def msg_in
	DEBUG and puts "#{@id} msg_in called"
	unless @next.nil?
	DEBUG and puts "#{@id} resuming #{@next.id}"
	@next.resume
	DEBUG and puts "#{@id} returned from #{@next.id}.resume"
	end
	DEBUG and puts "#{@id} msg_in returning \"#{@id} message\""
	"#{@id} message"
	end
	def msg_out msg
	DEBUG and puts "#{@id} msg_out called"
	DEBUG and puts "#{@id} calling Fiber.yield(#{msg})"
	Fiber.yield msg
	end
	end
	n=ARGV[0].to_i
	m=ARGV[1].to_i
	tm = Benchmark.measure do
	#build chain
	f0 = f = FiberRing.new(0)
	1.upto(n-1) { |i| f = f | FiberRing.new(i) }
	#run chain m times
	m.times { |j| DEBUG and puts "--- #{j} ---"; f0.resume }
	end
	puts "#{n}, #{m}, #{tm}"

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Bugger! No line numbers. I'll look into that.