anchor.diff:  ''');
   }
   
  -String qualify(LintRule r) => r.name.toString() +
  +String qualify(LintRule r) =>
  +    r.name.toString() +
       (r.maturity == Maturity.stable ? '' : ' (${r.maturity.name})');
   
   String toDescription(LintRule r) =>
  
positive.code: </html>
  ''';
  }
  
negative.code:     .map((r) => '${toDescription(r)}')
      .join('\n\n');
  
  List<String> get sortedRules => rules.map((r) => r.name).toList()..sort();
  
  void printUsage(ArgParser parser, [String error]) {
    var message = 'Generates lint docs.';
    if (error != null) {
  