View difference between Paste ID: hT1hG700 and R9NXSxDx

 --[[
 	2013 (c) psychedelixx
-	Minecraft Turtle: Stairs
+	Minecraft Turtle: Stairs (Robust)
 	2013-05-21
 
 	Digs a simple stair and places missing ground blocks and torches (every 4th horizontal block).
 
 	Usage:
 	- use turtle and type "label set <name>"
 	  (to give your turtle an unique name so it remembers its programs)
-	- type "pastebin get R9NXSxDx stairs"
+	- type "pastebin get hT1hG700 stairs"
 	- place solid blocks in slot 16 (lower right corner)
 	- place torches in slot 15 (left of slot 16)
 	- type "stairs <height> [<limit>]"
 		• where <height> represents the height of the hallway (3-5 seems good)
 		• and <limit> (optional) represents the Y coordinates digged down
 		  (if you're at y64 and type in 10, it will dig until it's at y54)
 --]]
 
 local args = { ... }
 if #args < 1 then
   print( "Usage: stairs <height> [<limit>]" )
   error()
 end
 height = tonumber(args[1])
 limit = 256
 if #args == 2 then
 	limit = tonumber(args[2])
 end
 
 if height < 2 then
   print( "The height must be >= 2." )
   error()
 end
 	print("======== 2013 (c) psychedelixx ========")
 	print("Let's go!")
 
 	while limit > 0 do
 
 	        if turtle.getFuelLevel() < height*2 then
 	                turtle.refuel()
 	        end
 	        if turtle.getFuelLevel() < height*2 then
 	                print("Fuel is almost empty!")
 	        end
 
 		print("")
 		print("Remaining: " .. limit)
 		print("Next torch in: " .. limit%4 .. "m")
 
 		for var = 0, height-3 do
-			turtle.digUp()
+			t.digUp()
 			if var < height-3 then
-				turtle.up()
+				t.up()
 			end
 			if var == 0 and limit%4 == 0 then
-				turtle.turnRight()
+				t.right()
-				turtle.dig()
+				t.dig()
 				turtle.select(15)
 				turtle.place()
-				turtle.turnLeft()
+				t.left()
 			end
 		end
 		for var = 0, height-4 do turtle.down() end
-		turtle.digDown()
+		t.digDown()
-		turtle.down()
+		t.down()
 		if not turtle.detectDown() then
 			turtle.select(16)
 			turtle.placeDown()
 		end
 
-	        while not turtle.forward() do
+ 	        t.dig()
- 	               turtle.dig()
+
 		turtle.forward()
 		limit = limit-1
 	end