anchor.diff:        )
         ..addMultiOption('define', abbr: 'D', valueHelp: 'key=value', help: '''
   Set values of environment variables. To specify multiple variables, use multiple options or use commas to separate key-value pairs.
  -E.g.: dart compile $commandName -Da=1,b=2 main.dart''')
  +For example, 'dart compile $commandName -Da=1,b=2 main.dart'.''')
         ..addFlag('enable-asserts',
             negatable: false, help: 'Enable assert statements.')
  -      ..addOption('packages', abbr: 'p', valueHelp: 'path', help: '''
  -Get package locations from the specified file instead of .packages. <path> can be relative or absolute.
  -E.g.: dart compile $commandName --packages=/tmp/pkgs main.dart
  -''')
  +      ..addOption('packages',
  +          abbr: 'p',
  +          valueHelp: 'path',
  +          help:
  +              '''Get package locations from the specified file instead of .packages.
  +<path> can be relative or absolute.
  +For example, 'dart compile $commandName --packages=/tmp/pkgs main.dart'.''')
         ..addOption('save-debugging-info', abbr: 'S', valueHelp: 'path', help: '''
  -Remove debugging information from the output and save it separately to the specified file. <path> can be relative or absolute.
  -''');
  +Remove debugging information from the output and save it separately to the specified file.
  +<path> can be relative or absolute.''');
     }
   
     @override
  
positive.code: 
  bool checkFile(String sourcePath) {
    if (!FileSystemEntity.isFileSync(sourcePath)) {
      stderr.writeln(
          '"$sourcePath" is not a file. See \'--help\' for more information.');
      stderr.flush();
      return false;
    }
  
negative.code:   FutureOr<int> run() async {
      // We expect a single rest argument; the dart entry point.
      if (argResults.rest.length != 1) {
        // This throws.
        usageException('Missing Dart entry point.');
      }
  
      final String sourcePath = argResults.rest[0];
      if (!checkFile(sourcePath)) {
        return -1;
  