code: private JCTree matchAnnoToTree(Attribute.Compound findme,
                                     List<Attribute.Compound> annos,
                                     List<JCAnnotation> trees) {
          for (Attribute.Compound anno : annos) {
              for (JCAnnotation tree : trees) {
                  JCTree match = matchAnnoToTree(findme, anno, tree);
                  if (match != null)
                      return match;
              }
          }
          return null;
      }
docs: Returns the tree for an annotation given a list of annotations
  in which to search (recursively) and their corresponding trees.
  Returns null if the tree cannot be found.