anchor.diff:  
     @override
     String get invocation => '${super.invocation} [<directory>]';
  -
     @override
     FutureOr<int> run() async {
       if (argResults.rest.length > 1) {
  
positive.code:   /// The number of spaces needed to indent follow-on lines (the body) under the
    /// message. The width left for the severity label plus the separator width.
    static const int _bodyIndentWidth = _severityWidth + 3;
  
    AnalyzeCommand({bool verbose = false})
        : super(cmdName, "Analyze the project's Dart code.") {
  
negative.code:     }
    }
  
    static String _escapeForMachineMode(String input) {
      var result = StringBuffer();
      for (var c in input.codeUnits) {
  