Useless fibers example

gistfile1.rb

fib = Fiber.new do
  v = 0
  loop do
    v += 1
    Fiber.yield v
    v.times { print "-"}
    puts v
  end
end

# now lets call it:
# => 20.times { fib.resume }
# -1
# --2
# ---3
# ----4
# -----5
# ------6
# -------7
# --------8
# ---------9
# ----------10
# -----------11
# ------------12
# -------------13
# --------------14
# ---------------15
# ----------------16
# -----------------17
# ------------------18
# -------------------19
#  => 20