= Expected for unknown reason.

--[[According to Benjamin Buford "Bubba" Blue I should make notes.
As always, things may (and probably will) go inevitably wrong. Therefore don't try this at home.
Ductape is my God. Also, I like functions in my functions in my functions in my functions... Yo dawg, I heard you liked functions, so...]]
local length = ...
local aLength = 0
--[[Source for function refuel(): tunnel, a standard CC mining turtle program. Therefore I take no credit for this function.
It refuels :o/>/>]]
local function refuel()
local fuelLevel = turtle.getFuelLevel()
if fuelLevel == "unlimited" or fuelLevel > 0 then
  return
end
print( "Attempting to Refuel..." )
local function tryRefuel()
  for n=1,16 do
   if turtle.getItemCount(n) > 0 then
	turtle.select(n)
	if turtle.refuel(1) then
	 turtle.select(1)
	 print( "Refuelling successful!" )
	 return true
	end
   end
  end
  turtle.select(1)
  return false
end

if not tryRefuel() then
  print( "Add more fuel to continue." )
  while not tryRefuel() do
   sleep(1)
  end
  print( "Resuming Tunnel." )
end
end
--Digs forward
local function frontDig()
while turtle.detect() do
  turtle.dig()
  sleep(0.25)
end
end
--Digs up
local function upDig()
while turtle.detectUp() do
  turtle.digUp()
  sleep(0.25)
end
end
--Digs down
local function downDig()
while turtle.detectDown() do
  turtle.digDown()
  sleep(0.25)
end
end
--Goes forward
local function frontGo()
refuel()
frontDig()
while turtle.attackUp() do
  turtle.attackUp()
  sleep(0.25)
end
turtle.forward()
end
--Goes up
local function upGo()
refuel()
upDig()
while turtle.attackUp() do
  turtle.attackUp()
  sleep(0.25)
end
turtle.up()
end
--Goes down
local function downGo()
refuel()
downDig()
while turtle.attackDown() do
  turtle.attackDown()
  sleep(0.25)
end
turtle.down()
end
--Makes trunk
local function trunkMine()
upDig()
turtle.turnLeft()
frontDig()
upGo()
frontDig()
turtle.turnLeft()
turtle.turnLeft()
frontDig()
downGo()
frontDig()
aLength = aLength + 1
if aLength % 10 then
  print( "The branch mine is now " , aLength , " blocks long." )
end
end
--Makes branch
local function branchMine()
local function branch()
  for n=1,5 do
   frontGo()
   upDig()
  end
end

local function move()
  turtle.turnLeft()
  turtle.turnLeft()
  for n=1,6 do
   frontGo()
  end
end

frontGo()
branch()
move()
frontGo()
branch()
move()
end
--Combines the branch and the trunk
local function treeMine()
for n=1,4 do
  trunkMine()
  turtle.turnLeft()
  if aLength ~= length then
   frontGo
  else
   print( "Finished branch mine." )
   return true
  end
end
branchMine()
turtle.turnLeft
end