anchor.diff:  option is found. The argument to the block are the option value (`true` in
   case the option does not have an argument) and the command.
   
  +==== Multivalued options ====
  +
   Each of these four methods take a `:multiple` option. When set to true, multiple
   option valus are accepted, and the option values will be stored in an array.
   
  
positive.code:     -s --stuff     specify stuff to do
  --------------------------------------------------------------------------------
  
  Let’s disect the command definition and start with the first five lines:
  
  [source,ruby]
  
negative.code: the supercommand, because the latter will be automatically prepended.
  
  Aliases don’t make sense for root commands, but for subcommands they do.
  
  === Command-line options ===
  
  The next few lines contain the command’s option definitions:
  
  