What's wrong with my code?

My mining turtle doesn't take this code. Can someone tell me what's wrong with it?

x = 0
while turtle.detect() do
turtle.dig()
turtle.digUp()
turtle.forward()
x = x+1
end
print "This tunnel is"...x..."metres long."

I want the turtle to create a 1x2 tunnel through a hill, mountain, wall, etc, then return a message stating how many blocks long the tunnel is. Can anyone help?

Ah ha!
I fixed my script, terribly sorry.
I needed to remove the ellipses.

Yes, string concatenation is done with only 2 periods

print("This tunnel is " .. x .. " metres long.")