[hilco@paradox L0]$ cat source.txt
var
  blah: integer
end

code
  blah = 5
  print(5)
end
[hilco@paradox L0]$ ./l0
Usage: /home/hilco/L0/l0 [-c | -i] <source file>
[hilco@paradox L0]$ ./l0 -c source.txt
8 lines compiled successfully.
[hilco@paradox L0]$ ./l0 -i source.txt
5[hilco@paradox L0]$