Go 编程语言 LFGo

用法：

$ racket l++.rkt -h
l++.rkt [ <option> ... ] [<filenames>] ...
 where <option> is one of
  -c, --compile : Compile only; do not run
  -v, --verbose : Display verbose messages
  -o <file> : Place the output into <file>
  --help, -h : Show this help
  -- : Do not treat any remaining argument as a switch (at this level)
 Multiple single-letter switches can be combined after one `-'; for  example: `-h-' is the same as `-h --'