anchor.diff:  
         if(libName.startsWith('bot')) {
           botHeaders.add(child);
  -      } else if(libName.startsWith('hop')) {
  -        hopHeaders.add(child);
         } else {
           otherHeaders.add(child);
         }
  
positive.code:   };
  
    doSection('Dart Bag of Tricks', botHeaders);
    doSection('Hop task system', hopHeaders);
    doSection('Dependencies', otherHeaders);
  
    return new Future<Document>.immediate(source);
  
negative.code: 
    // should only have h3 and h4 elements
    final botHeaders = new List<Element>();
    final otherHeaders = new List<Element>();
  
    for(final child in contentDiv.children) {
  