anchor.diff: -library markdown.tool.common_mark_stats;
  -
   import 'dart:collection';
   import 'dart:convert';
   import 'dart:io';
  
positive.code:   var raw = options['raw'];
    var verbose = options['verbose'];
  
    var sections = loadCommonMarkSections();
  
    var scores = new SplayTreeMap<String, SplayTreeMap<int, bool>>(
        compareAsciiLowerCaseNatural);
  
negative.code: 
  // Locate the "test" directory. Use mirrors so that this works with the test
  // package, which loads this suite into an isolate.
  String get _currentDir => p
      .dirname((reflect(main) as ClosureMirror).function.location.sourceUri.path);
  
  void main(List<String> args) {
    final parser = new ArgParser()
  