Turtle-related question

I'm new to Lua (coding in general, actually), so please excuse me if there's a really obvious solution to this.
Now, I've written a program on my turtle that as far as I know should dig me a custom bunker area. Code is below (It's not very readble right now, I'm sorry about that. I usually don't pretty it up untill I know it works):

x = 0
while true do
turtle.down(1)
turtle.digDown()
x = x+1
if x == 8 then
break
end
end
x = 0
while true do
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.forward(1)
turtle.down(1)
x = x+1
if x == 3 then
break
end
end
turtle.turnLeft(1)
x = 0
while true do
turtle.dig()
turtle.up(1)
turtle.dig
turtle.forward(1)
turtle.down()
x = x+1
if x == 3 then
break
end
end
x = 0
turtle.turnRight(2)
turtle.forward(3)
while true do
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.down(1)
turtle.forward(1)
x = x+1
if x == 3 then
break
end
end
y = 0
while true do
turtle.turnLeft(1)
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.forward(1)
turtle.turnLeft(1)
turtle.down(1)
x = 0
while true do
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.forward(1)
turtle.down(1)
x = x+1
if x == 6 then
break
end
end
turtle.turnRight(1)
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.forward(1)
turtle.turnRight(1)
turtle.down(1)
x = 0
while true do
turtle.dig()
turtle.up(1)
turtle.dig()
turtle.forward(1)
turtle.down(1)
x = x+1
if x == 6 then
break
end
end
y = y+1
if y == 4 then
break
end
end

However, when I try to run the program it errors, giving me:

bios:206: [string "bunkertest"]:28: '=' expected

The only thing on Line28 is below, so I'm not sure why it's expecting an '='

turtle.forward(1)

Any help would be appreciated.

You can't pass any arguments to the turtle-movement functions.
You have to call them multiple times (for-loop) in order to move multiple times.
Hint: Make a separate function for this which takes an argument for the desired movement and one for the number of how many times said movement is to be performed.

Ah, that makes sense. I'll have to rewrite it then.
Thanks, Espen.

However, when I try to run the program it errors, giving me:
bios:206: [string "bunkertest"]:28: '=' expected
The only thing on Line28 is below, so I'm not sure why it's expecting an '='
turtle.forward(1)

turtle.dig without "()" on the previous line