anchor.diff:  ----
   
   Here is a small example application that uses the `CommandLine.call` <<Less Boilerplate,convenience method>>
  -to do parsing and error handling in one line of code. The <<Fully Automatic Help,mixinStandardHelpOptions>> attribute is all
  +to do parsing and error handling in one line of code. The <<Mixin Standard Help Options,mixinStandardHelpOptions>> attribute is all
   that is needed to give your application usage help and version help.
   
   [[CheckSum-application]]
  
positive.code: }
  ----
  
  The above example uses the <<Fully Automatic Help,mixinStandardHelpOptions>> attribute to mix in
  <<Help Options,`usageHelp`>> and <<Help Options,`versionHelp`>> options and registers the `help` subcommand.
  
  The usage help message for each subcommand is produced by calling `CommandLine.usage(new SubCommand(), out)`.
  
negative.code: ----
  
  === Custom Help Subcommands
  Custom help subcommands should mark themselves as a <<Help Subcommands,help command>> to tell picocli not to throw a `MissingParameterException` when required options are missing.
  
  [source,java]
  ----
  