>>>
greet(@Rest(valueHelp: 'who', help: 'Name(s) to greet.') List<String> who,
    {@Group.start(title: 'Output')
    @Option(help: 'How many !\'s to append.')
    int enthusiasm: 0,
    @Flag(abbr: 'l', help: 'Put names on separate lines.') bool lineMode: false,
    @Option(name: 'greeting', help: 'Alternate word to greet with e.g. "Hi".')
    String salutation: 'Hello'}) {}
<<<
greet(
  @Rest(valueHelp: 'who', help: 'Name(s) to greet.') List<String> who, {
  @Group.start(title: 'Output')
  @Option(help: 'How many !\'s to append.')
  int enthusiasm: 0,
  @Flag(abbr: 'l', help: 'Put names on separate lines.') bool lineMode: false,
  @Option(name: 'greeting', help: 'Alternate word to greet with e.g. "Hi".')
  String salutation: 'Hello',
}) {}