anchor.diff:  The above will generate the following usage help message, where the `all` field is not shown:
   ----
   Usage: <main class> <host> <port> [<files>...]
  -      host                    destination host
  -      port                    destination port
  -      files                   files to transfer
  +      host    destination host
  +      port    destination port
  +      files   files to transfer
   ----
   
   === Show Default Values
  
positive.code:     public static void main(String[] args) throws Exception {
          // CheckSum implements Callable, so parsing, error handling and handling user
          // requests for usage help or version help can be done with one line of code.
          CommandLine.call(new CheckSum(), System.err, args);
      }
  
      @Override
  
negative.code: ----
  Usage: cat [-AbeEnstTuv] [--help] [--version] [FILE...]
  Concatenate FILE(s), or standard input, to standard output.
        FILE                 Files whose contents to display
    -A, --show-all           equivalent to -vET
    -b, --number-nonblank    number nonempty output lines, overrides -n
    -e                       equivalent to -vET
    -E, --show-ends          display $ at end of each line
    -n, --number             number all output lines
    -s, --squeeze-blank      suppress repeated empty output lines
    -t                       equivalent to -vT
    -T, --show-tabs          display TAB characters as ^I
    -u                       (ignored)
    -v, --show-nonprinting   use ^ and M- notation, except for LDF and TAB
        --help               display this help and exit
        --version            output version information and exit
  Copyright(c) 2017
  ----
  
  