anchor.diff:  
   @ReflectiveTestCase()
   class _AnalysisNotificationHighlightsTest extends AbstractAnalysisTest {
  -  List<_HighlighRegion> regions;
  +  List<_HighlightRegion> regions;
   
     void assertHasRawRegion(HighlightType type, int offset, int length) {
  -    for (_HighlighRegion region in regions) {
  +    for (_HighlightRegion region in regions) {
         if (region.offset == offset && region.length == length && region.type ==
             type.name) {
           return;
  
positive.code:   }
  
    void assertNoRawRegion(HighlightType type, int offset, int length) {
      for (_HighlighRegion region in regions) {
        if (region.offset == offset && region.length == length && region.type ==
            type.name) {
          fail(
  
negative.code:         List<Map<String, Object>> regionsJson = notification.getParameter(
              REGIONS);
          for (Map<String, Object> regionJson in regionsJson) {
            regions.add(new _HighlightRegion.fromJson(regionJson));
          }
        }
      }
  